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[IPV6]: Eliminate difference in actions of sysctl and proc handler for conf.all.forwa...
[deliverable/linux.git] / net / ipv6 / addrconf.c
CommitLineData
1da177e4
LT		 1/*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
1ab1457c 6 * Pedro Roque <roque@di.fc.ul.pt>
1da177e4
LT		 7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
9 * $Id: addrconf.c,v 1.69 2001/10/31 21:55:54 davem Exp $
10 *
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License
13 * as published by the Free Software Foundation; either version
14 * 2 of the License, or (at your option) any later version.
15 */
16
17/*
18 * Changes:
19 *
20 * Janos Farkas : delete timer on ifdown
21 * <chexum@bankinf.banki.hu>
22 * Andi Kleen : kill double kfree on module
23 * unload.
24 * Maciej W. Rozycki : FDDI support
25 * sekiya@USAGI : Don't send too many RS
26 * packets.
27 * yoshfuji@USAGI : Fixed interval between DAD
28 * packets.
29 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
30 * address validation timer.
31 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
32 * support.
33 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
34 * address on a same interface.
35 * YOSHIFUJI Hideaki @USAGI : ARCnet support
36 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
37 * seq_file.
b1cacb68
YH		 38 * YOSHIFUJI Hideaki @USAGI : improved source address
39 * selection; consider scope,
40 * status etc.
1da177e4
LT		 41 */
42
1da177e4
LT		 43#include <linux/errno.h>
44#include <linux/types.h>
45#include <linux/socket.h>
46#include <linux/sockios.h>
1da177e4
LT		 47#include <linux/net.h>
48#include <linux/in6.h>
49#include <linux/netdevice.h>
1823730f 50#include <linux/if_addr.h>
1da177e4
LT		 51#include <linux/if_arp.h>
52#include <linux/if_arcnet.h>
53#include <linux/if_infiniband.h>
54#include <linux/route.h>
55#include <linux/inetdevice.h>
56#include <linux/init.h>
57#ifdef CONFIG_SYSCTL
58#include <linux/sysctl.h>
59#endif
4fc268d2 60#include <linux/capability.h>
1da177e4
LT		 61#include <linux/delay.h>
62#include <linux/notifier.h>
543537bd 63#include <linux/string.h>
1da177e4 64
457c4cbc 65#include <net/net_namespace.h>
1da177e4
LT		 66#include <net/sock.h>
67#include <net/snmp.h>
68
69#include <net/ipv6.h>
70#include <net/protocol.h>
71#include <net/ndisc.h>
72#include <net/ip6_route.h>
73#include <net/addrconf.h>
74#include <net/tcp.h>
75#include <net/ip.h>
5d620266 76#include <net/netlink.h>
f24e3d65 77#include <net/pkt_sched.h>
1da177e4
LT		 78#include <linux/if_tunnel.h>
79#include <linux/rtnetlink.h>
80
81#ifdef CONFIG_IPV6_PRIVACY
82#include <linux/random.h>
1da177e4
LT		 83#endif
84
85#include <asm/uaccess.h>
7f7d9a6b 86#include <asm/unaligned.h>
1da177e4
LT		 87
88#include <linux/proc_fs.h>
89#include <linux/seq_file.h>
90
91/* Set to 3 to get tracing... */
92#define ACONF_DEBUG 2
93
94#if ACONF_DEBUG >= 3
95#define ADBG(x) printk x
96#else
97#define ADBG(x)
98#endif
99
100#define INFINITY_LIFE_TIME 0xFFFFFFFF
101#define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b)))
102
103#ifdef CONFIG_SYSCTL
f52295a9 104static void addrconf_sysctl_register(struct inet6_dev *idev);
1da177e4
LT		 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{
7f7d9a6b
HX		 258 if (snmp_mib_init((void **)idev->stats.ipv6,
259 sizeof(struct ipstats_mib),
260 __alignof__(struct ipstats_mib)) < 0)
261 goto err_ip;
262 if (snmp_mib_init((void **)idev->stats.icmpv6,
263 sizeof(struct icmpv6_mib),
264 __alignof__(struct icmpv6_mib)) < 0)
265 goto err_icmp;
14878f75
DS		 266 if (snmp_mib_init((void **)idev->stats.icmpv6msg,
267 sizeof(struct icmpv6msg_mib),
268 __alignof__(struct icmpv6msg_mib)) < 0)
269 goto err_icmpmsg;
7f7d9a6b
HX		 270
271 return 0;
272
14878f75
DS		 273err_icmpmsg:
274 snmp_mib_free((void **)idev->stats.icmpv6);
7f7d9a6b
HX		 275err_icmp:
276 snmp_mib_free((void **)idev->stats.ipv6);
277err_ip:
aaf70ec7 278 return -ENOMEM;
7f7d9a6b
HX		 279}
280
16910b98 281static void snmp6_free_dev(struct inet6_dev *idev)
7f7d9a6b 282{
14878f75 283 snmp_mib_free((void **)idev->stats.icmpv6msg);
7f7d9a6b
HX		 284 snmp_mib_free((void **)idev->stats.icmpv6);
285 snmp_mib_free((void **)idev->stats.ipv6);
7f7d9a6b
HX		 286}
287
1da177e4
LT		 288/* Nobody refers to this device, we may destroy it. */
289
8814c4b5
YH		 290static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
291{
292 struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
293 kfree(idev);
294}
295
1da177e4
LT		 296void in6_dev_finish_destroy(struct inet6_dev *idev)
297{
298 struct net_device *dev = idev->dev;
299 BUG_TRAP(idev->addr_list==NULL);
300 BUG_TRAP(idev->mc_list==NULL);
301#ifdef NET_REFCNT_DEBUG
302 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
303#endif
304 dev_put(dev);
305 if (!idev->dead) {
306 printk("Freeing alive inet6 device %p\n", idev);
307 return;
308 }
309 snmp6_free_dev(idev);
8814c4b5 310 call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
1da177e4
LT		 311}
312
7159039a
YH		 313EXPORT_SYMBOL(in6_dev_finish_destroy);
314
1da177e4
LT		 315static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
316{
317 struct inet6_dev *ndev;
d88ae4cc 318 struct in6_addr maddr;
1da177e4
LT		 319
320 ASSERT_RTNL();
321
322 if (dev->mtu < IPV6_MIN_MTU)
323 return NULL;
324
1ab1457c 325 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
322f74a4 326
1ab1457c
YH		 327 if (ndev == NULL)
328 return NULL;
322f74a4
IO		 329
330 rwlock_init(&ndev->lock);
331 ndev->dev = dev;
332 memcpy(&ndev->cnf, &ipv6_devconf_dflt, sizeof(ndev->cnf));
333 ndev->cnf.mtu6 = dev->mtu;
334 ndev->cnf.sysctl = NULL;
335 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
336 if (ndev->nd_parms == NULL) {
337 kfree(ndev);
338 return NULL;
339 }
340 /* We refer to the device */
341 dev_hold(dev);
1da177e4 342
322f74a4
IO		 343 if (snmp6_alloc_dev(ndev) < 0) {
344 ADBG((KERN_WARNING
345 "%s(): cannot allocate memory for statistics; dev=%s.\n",
346 __FUNCTION__, dev->name));
347 neigh_parms_release(&nd_tbl, ndev->nd_parms);
348 ndev->dead = 1;
349 in6_dev_finish_destroy(ndev);
350 return NULL;
351 }
1da177e4 352
322f74a4
IO		 353 if (snmp6_register_dev(ndev) < 0) {
354 ADBG((KERN_WARNING
355 "%s(): cannot create /proc/net/dev_snmp6/%s\n",
356 __FUNCTION__, dev->name));
357 neigh_parms_release(&nd_tbl, ndev->nd_parms);
358 ndev->dead = 1;
359 in6_dev_finish_destroy(ndev);
360 return NULL;
361 }
362
363 /* One reference from device. We must do this before
364 * we invoke __ipv6_regen_rndid().
365 */
366 in6_dev_hold(ndev);
1da177e4
LT		 367
368#ifdef CONFIG_IPV6_PRIVACY
b24b8a24 369 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
322f74a4
IO		 370 if ((dev->flags&IFF_LOOPBACK) ||
371 dev->type == ARPHRD_TUNNEL ||
0be669bb
JR		 372#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
373 dev->type == ARPHRD_SIT ||
374#endif
375 dev->type == ARPHRD_NONE) {
322f74a4
IO		 376 printk(KERN_INFO
377 "%s: Disabled Privacy Extensions\n",
378 dev->name);
379 ndev->cnf.use_tempaddr = -1;
c7dc89c0
FT		 380
381 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
382 printk(KERN_INFO
383 "%s: Disabled Multicast RS\n",
384 dev->name);
385 ndev->cnf.rtr_solicits = 0;
386 }
322f74a4
IO		 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);
f52295a9 403 addrconf_sysctl_register(ndev);
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}
c8fecf22
PE		 479
480static void addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old)
481{
482 if (p == &ipv6_devconf_dflt.forwarding)
483 return;
484
485 if (p == &ipv6_devconf.forwarding) {
486 ipv6_devconf_dflt.forwarding = ipv6_devconf.forwarding;
487 addrconf_forward_change();
488 } else if ((!*p) ^ (!old))
489 dev_forward_change((struct inet6_dev *)table->extra1);
490
491 if (*p)
492 rt6_purge_dflt_routers();
493}
1da177e4
LT		 494#endif
495
496/* Nobody refers to this ifaddr, destroy it */
497
498void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
499{
500 BUG_TRAP(ifp->if_next==NULL);
501 BUG_TRAP(ifp->lst_next==NULL);
502#ifdef NET_REFCNT_DEBUG
503 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
504#endif
505
506 in6_dev_put(ifp->idev);
507
508 if (del_timer(&ifp->timer))
509 printk("Timer is still running, when freeing ifa=%p\n", ifp);
510
511 if (!ifp->dead) {
512 printk("Freeing alive inet6 address %p\n", ifp);
513 return;
514 }
515 dst_release(&ifp->rt->u.dst);
516
517 kfree(ifp);
518}
519
e55ffac6
BH		 520static void
521ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
522{
523 struct inet6_ifaddr *ifa, **ifap;
8a6ce0c0 524 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
e55ffac6
BH		 525
526 /*
527 * Each device address list is sorted in order of scope -
528 * global before linklocal.
529 */
530 for (ifap = &idev->addr_list; (ifa = *ifap) != NULL;
531 ifap = &ifa->if_next) {
8a6ce0c0 532 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
e55ffac6
BH		 533 break;
534 }
535
536 ifp->if_next = *ifap;
537 *ifap = ifp;
538}
539
1da177e4
LT		 540/* On success it returns ifp with increased reference count */
541
542static struct inet6_ifaddr *
543ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
e431b8c0 544 int scope, u32 flags)
1da177e4
LT		 545{
546 struct inet6_ifaddr *ifa = NULL;
547 struct rt6_info *rt;
548 int hash;
549 int err = 0;
550
8814c4b5 551 rcu_read_lock_bh();
1da177e4
LT		 552 if (idev->dead) {
553 err = -ENODEV; /*XXX*/
554 goto out2;
555 }
556
557 write_lock(&addrconf_hash_lock);
558
559 /* Ignore adding duplicate addresses on an interface */
560 if (ipv6_chk_same_addr(addr, idev->dev)) {
561 ADBG(("ipv6_add_addr: already assigned\n"));
562 err = -EEXIST;
563 goto out;
564 }
565
322f74a4 566 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
1da177e4
LT		 567
568 if (ifa == NULL) {
569 ADBG(("ipv6_add_addr: malloc failed\n"));
570 err = -ENOBUFS;
571 goto out;
572 }
573
574 rt = addrconf_dst_alloc(idev, addr, 0);
575 if (IS_ERR(rt)) {
576 err = PTR_ERR(rt);
577 goto out;
578 }
579
1da177e4
LT		 580 ipv6_addr_copy(&ifa->addr, addr);
581
582 spin_lock_init(&ifa->lock);
583 init_timer(&ifa->timer);
584 ifa->timer.data = (unsigned long) ifa;
585 ifa->scope = scope;
586 ifa->prefix_len = pfxlen;
587 ifa->flags = flags | IFA_F_TENTATIVE;
588 ifa->cstamp = ifa->tstamp = jiffies;
589
57f5f544
KF		 590 ifa->rt = rt;
591
95c385b4
NH		 592 /*
593 * part one of RFC 4429, section 3.3
594 * We should not configure an address as
595 * optimistic if we do not yet know the link
596 * layer address of our nexhop router
597 */
598
599 if (rt->rt6i_nexthop == NULL)
600 ifa->flags &= ~IFA_F_OPTIMISTIC;
601
1da177e4
LT		 602 ifa->idev = idev;
603 in6_dev_hold(idev);
604 /* For caller */
605 in6_ifa_hold(ifa);
606
607 /* Add to big hash table */
608 hash = ipv6_addr_hash(addr);
609
610 ifa->lst_next = inet6_addr_lst[hash];
611 inet6_addr_lst[hash] = ifa;
612 in6_ifa_hold(ifa);
613 write_unlock(&addrconf_hash_lock);
614
615 write_lock(&idev->lock);
616 /* Add to inet6_dev unicast addr list. */
e55ffac6 617 ipv6_link_dev_addr(idev, ifa);
1da177e4
LT		 618
619#ifdef CONFIG_IPV6_PRIVACY
620 if (ifa->flags&IFA_F_TEMPORARY) {
621 ifa->tmp_next = idev->tempaddr_list;
622 idev->tempaddr_list = ifa;
623 in6_ifa_hold(ifa);
624 }
625#endif
626
1da177e4
LT		 627 in6_ifa_hold(ifa);
628 write_unlock(&idev->lock);
629out2:
8814c4b5 630 rcu_read_unlock_bh();
1da177e4 631
fd92833a 632 if (likely(err == 0))
e041c683 633 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
1da177e4
LT		 634 else {
635 kfree(ifa);
636 ifa = ERR_PTR(err);
637 }
638
639 return ifa;
640out:
641 write_unlock(&addrconf_hash_lock);
642 goto out2;
643}
644
645/* This function wants to get referenced ifp and releases it before return */
646
647static void ipv6_del_addr(struct inet6_ifaddr *ifp)
648{
649 struct inet6_ifaddr *ifa, **ifap;
650 struct inet6_dev *idev = ifp->idev;
651 int hash;
652 int deleted = 0, onlink = 0;
653 unsigned long expires = jiffies;
654
655 hash = ipv6_addr_hash(&ifp->addr);
656
657 ifp->dead = 1;
658
659 write_lock_bh(&addrconf_hash_lock);
660 for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
661 ifap = &ifa->lst_next) {
662 if (ifa == ifp) {
663 *ifap = ifa->lst_next;
664 __in6_ifa_put(ifp);
665 ifa->lst_next = NULL;
666 break;
667 }
668 }
669 write_unlock_bh(&addrconf_hash_lock);
670
671 write_lock_bh(&idev->lock);
672#ifdef CONFIG_IPV6_PRIVACY
673 if (ifp->flags&IFA_F_TEMPORARY) {
674 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
675 ifap = &ifa->tmp_next) {
676 if (ifa == ifp) {
677 *ifap = ifa->tmp_next;
678 if (ifp->ifpub) {
679 in6_ifa_put(ifp->ifpub);
680 ifp->ifpub = NULL;
681 }
682 __in6_ifa_put(ifp);
683 ifa->tmp_next = NULL;
684 break;
685 }
686 }
687 }
688#endif
689
1d142804 690 for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
1da177e4
LT		 691 if (ifa == ifp) {
692 *ifap = ifa->if_next;
693 __in6_ifa_put(ifp);
694 ifa->if_next = NULL;
695 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
696 break;
697 deleted = 1;
1d142804 698 continue;
1da177e4
LT		 699 } else if (ifp->flags & IFA_F_PERMANENT) {
700 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
701 ifp->prefix_len)) {
702 if (ifa->flags & IFA_F_PERMANENT) {
703 onlink = 1;
704 if (deleted)
705 break;
706 } else {
707 unsigned long lifetime;
708
709 if (!onlink)
710 onlink = -1;
711
712 spin_lock(&ifa->lock);
713 lifetime = min_t(unsigned long,
714 ifa->valid_lft, 0x7fffffffUL/HZ);
715 if (time_before(expires,
716 ifa->tstamp + lifetime * HZ))
717 expires = ifa->tstamp + lifetime * HZ;
718 spin_unlock(&ifa->lock);
719 }
720 }
721 }
1d142804 722 ifap = &ifa->if_next;
1da177e4
LT		 723 }
724 write_unlock_bh(&idev->lock);
725
726 ipv6_ifa_notify(RTM_DELADDR, ifp);
727
e041c683 728 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
1da177e4
LT		 729
730 addrconf_del_timer(ifp);
731
732 /*
733 * Purge or update corresponding prefix
734 *
735 * 1) we don't purge prefix here if address was not permanent.
736 * prefix is managed by its own lifetime.
737 * 2) if there're no addresses, delete prefix.
738 * 3) if there're still other permanent address(es),
739 * corresponding prefix is still permanent.
740 * 4) otherwise, update prefix lifetime to the
741 * longest valid lifetime among the corresponding
742 * addresses on the device.
743 * Note: subsequent RA will update lifetime.
744 *
745 * --yoshfuji
746 */
747 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
748 struct in6_addr prefix;
749 struct rt6_info *rt;
750
751 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
752 rt = rt6_lookup(&prefix, NULL, ifp->idev->dev->ifindex, 1);
753
754 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
755 if (onlink == 0) {
e0a1ad73 756 ip6_del_rt(rt);
1da177e4
LT		 757 rt = NULL;
758 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
759 rt->rt6i_expires = expires;
760 rt->rt6i_flags |= RTF_EXPIRES;
761 }
762 }
763 dst_release(&rt->u.dst);
764 }
765
766 in6_ifa_put(ifp);
767}
768
769#ifdef CONFIG_IPV6_PRIVACY
770static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
771{
772 struct inet6_dev *idev = ifp->idev;
773 struct in6_addr addr, *tmpaddr;
774 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
775 int tmp_plen;
776 int ret = 0;
777 int max_addresses;
95c385b4 778 u32 addr_flags;
1da177e4
LT		 779
780 write_lock(&idev->lock);
781 if (ift) {
782 spin_lock_bh(&ift->lock);
783 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
784 spin_unlock_bh(&ift->lock);
785 tmpaddr = &addr;
786 } else {
787 tmpaddr = NULL;
788 }
789retry:
790 in6_dev_hold(idev);
791 if (idev->cnf.use_tempaddr <= 0) {
792 write_unlock(&idev->lock);
793 printk(KERN_INFO
794 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
795 in6_dev_put(idev);
796 ret = -1;
797 goto out;
798 }
799 spin_lock_bh(&ifp->lock);
800 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
801 idev->cnf.use_tempaddr = -1; /*XXX*/
802 spin_unlock_bh(&ifp->lock);
803 write_unlock(&idev->lock);
804 printk(KERN_WARNING
805 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
806 in6_dev_put(idev);
807 ret = -1;
808 goto out;
809 }
810 in6_ifa_hold(ifp);
811 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
812 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
813 spin_unlock_bh(&ifp->lock);
814 write_unlock(&idev->lock);
815 printk(KERN_WARNING
816 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
817 in6_ifa_put(ifp);
818 in6_dev_put(idev);
819 ret = -1;
820 goto out;
821 }
822 memcpy(&addr.s6_addr[8], idev->rndid, 8);
823 tmp_valid_lft = min_t(__u32,
824 ifp->valid_lft,
825 idev->cnf.temp_valid_lft);
1ab1457c
YH		 826 tmp_prefered_lft = min_t(__u32,
827 ifp->prefered_lft,
1da177e4
LT		 828 idev->cnf.temp_prefered_lft - desync_factor / HZ);
829 tmp_plen = ifp->prefix_len;
830 max_addresses = idev->cnf.max_addresses;
831 tmp_cstamp = ifp->cstamp;
832 tmp_tstamp = ifp->tstamp;
833 spin_unlock_bh(&ifp->lock);
834
835 write_unlock(&idev->lock);
95c385b4
NH		 836
837 addr_flags = IFA_F_TEMPORARY;
838 /* set in addrconf_prefix_rcv() */
839 if (ifp->flags & IFA_F_OPTIMISTIC)
840 addr_flags |= IFA_F_OPTIMISTIC;
841
1da177e4 842 ift = !max_addresses ||
1ab1457c 843 ipv6_count_addresses(idev) < max_addresses ?
1da177e4 844 ipv6_add_addr(idev, &addr, tmp_plen,
95c385b4
NH		 845 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
846 addr_flags) : NULL;
1da177e4
LT		 847 if (!ift || IS_ERR(ift)) {
848 in6_ifa_put(ifp);
849 in6_dev_put(idev);
850 printk(KERN_INFO
851 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
852 tmpaddr = &addr;
853 write_lock(&idev->lock);
854 goto retry;
855 }
856
857 spin_lock_bh(&ift->lock);
858 ift->ifpub = ifp;
859 ift->valid_lft = tmp_valid_lft;
860 ift->prefered_lft = tmp_prefered_lft;
861 ift->cstamp = tmp_cstamp;
862 ift->tstamp = tmp_tstamp;
863 spin_unlock_bh(&ift->lock);
864
865 addrconf_dad_start(ift, 0);
866 in6_ifa_put(ift);
867 in6_dev_put(idev);
868out:
869 return ret;
870}
871#endif
872
873/*
072047e4 874 * Choose an appropriate source address (RFC3484)
1da177e4 875 */
072047e4
YH		 876struct ipv6_saddr_score {
877 int addr_type;
878 unsigned int attrs;
879 int matchlen;
0d27b427 880 int scope;
072047e4
YH		 881 unsigned int rule;
882};
883
884#define IPV6_SADDR_SCORE_LOCAL 0x0001
885#define IPV6_SADDR_SCORE_PREFERRED 0x0004
886#define IPV6_SADDR_SCORE_HOA 0x0008
887#define IPV6_SADDR_SCORE_OIF 0x0010
888#define IPV6_SADDR_SCORE_LABEL 0x0020
889#define IPV6_SADDR_SCORE_PRIVACY 0x0040
890
b6f99a21 891static inline int ipv6_saddr_preferred(int type)
1da177e4 892{
072047e4
YH		 893 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
894 IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
895 return 1;
896 return 0;
1da177e4
LT		 897}
898
072047e4 899int ipv6_dev_get_saddr(struct net_device *daddr_dev,
1da177e4
LT		 900 struct in6_addr *daddr, struct in6_addr *saddr)
901{
072047e4
YH		 902 struct ipv6_saddr_score hiscore;
903 struct inet6_ifaddr *ifa_result = NULL;
904 int daddr_type = __ipv6_addr_type(daddr);
905 int daddr_scope = __ipv6_addr_src_scope(daddr_type);
303065a8
YH		 906 int daddr_ifindex = daddr_dev ? daddr_dev->ifindex : 0;
907 u32 daddr_label = ipv6_addr_label(daddr, daddr_type, daddr_ifindex);
072047e4 908 struct net_device *dev;
1da177e4 909
072047e4 910 memset(&hiscore, 0, sizeof(hiscore));
1da177e4 911
072047e4 912 read_lock(&dev_base_lock);
8814c4b5 913 rcu_read_lock();
1da177e4 914
881d966b 915 for_each_netdev(&init_net, dev) {
072047e4
YH		 916 struct inet6_dev *idev;
917 struct inet6_ifaddr *ifa;
918
919 /* Rule 0: Candidate Source Address (section 4)
920 * - multicast and link-local destination address,
921 * the set of candidate source address MUST only
922 * include addresses assigned to interfaces
923 * belonging to the same link as the outgoing
924 * interface.
925 * (- For site-local destination addresses, the
926 * set of candidate source addresses MUST only
927 * include addresses assigned to interfaces
928 * belonging to the same site as the outgoing
929 * interface.)
930 */
931 if ((daddr_type & IPV6_ADDR_MULTICAST ||
932 daddr_scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
933 daddr_dev && dev != daddr_dev)
934 continue;
1da177e4 935
1da177e4 936 idev = __in6_dev_get(dev);
072047e4
YH		 937 if (!idev)
938 continue;
939
940 read_lock_bh(&idev->lock);
941 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
942 struct ipv6_saddr_score score;
943
944 score.addr_type = __ipv6_addr_type(&ifa->addr);
945
6b3ae80a
YH		 946 /* Rule 0:
947 * - Tentative Address (RFC2462 section 5.4)
948 * - A tentative address is not considered
949 * "assigned to an interface" in the traditional
95c385b4 950 * sense, unless it is also flagged as optimistic.
6b3ae80a 951 * - Candidate Source Address (section 4)
072047e4
YH		 952 * - In any case, anycast addresses, multicast
953 * addresses, and the unspecified address MUST
954 * NOT be included in a candidate set.
955 */
95c385b4
NH		 956 if ((ifa->flags & IFA_F_TENTATIVE) &&
957 (!(ifa->flags & IFA_F_OPTIMISTIC)))
6b3ae80a 958 continue;
072047e4
YH		 959 if (unlikely(score.addr_type == IPV6_ADDR_ANY ||
960 score.addr_type & IPV6_ADDR_MULTICAST)) {
961 LIMIT_NETDEBUG(KERN_DEBUG
3b6d821c 962 "ADDRCONF: unspecified / multicast address "
072047e4
YH		 963 "assigned as unicast address on %s",
964 dev->name);
965 continue;
966 }
967
968 score.attrs = 0;
969 score.matchlen = 0;
970 score.scope = 0;
971 score.rule = 0;
972
973 if (ifa_result == NULL) {
974 /* record it if the first available entry */
975 goto record_it;
976 }
977
978 /* Rule 1: Prefer same address */
979 if (hiscore.rule < 1) {
980 if (ipv6_addr_equal(&ifa_result->addr, daddr))
981 hiscore.attrs |= IPV6_SADDR_SCORE_LOCAL;
982 hiscore.rule++;
983 }
984 if (ipv6_addr_equal(&ifa->addr, daddr)) {
985 score.attrs |= IPV6_SADDR_SCORE_LOCAL;
986 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)) {
987 score.rule = 1;
988 goto record_it;
1da177e4 989 }
072047e4
YH		 990 } else {
991 if (hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)
992 continue;
1da177e4 993 }
1da177e4 994
072047e4
YH		 995 /* Rule 2: Prefer appropriate scope */
996 if (hiscore.rule < 2) {
997 hiscore.scope = __ipv6_addr_src_scope(hiscore.addr_type);
998 hiscore.rule++;
999 }
1000 score.scope = __ipv6_addr_src_scope(score.addr_type);
1001 if (hiscore.scope < score.scope) {
1002 if (hiscore.scope < daddr_scope) {
1003 score.rule = 2;
1004 goto record_it;
1005 } else
1006 continue;
1007 } else if (score.scope < hiscore.scope) {
1008 if (score.scope < daddr_scope)
e55ffac6 1009 break; /* addresses sorted by scope */
072047e4
YH		 1010 else {
1011 score.rule = 2;
1012 goto record_it;
1013 }
1014 }
1da177e4 1015
95c385b4 1016 /* Rule 3: Avoid deprecated and optimistic addresses */
072047e4
YH		 1017 if (hiscore.rule < 3) {
1018 if (ipv6_saddr_preferred(hiscore.addr_type) ||
95c385b4
NH		 1019 (((ifa_result->flags &
1020 (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)) == 0)))
072047e4
YH		 1021 hiscore.attrs |= IPV6_SADDR_SCORE_PREFERRED;
1022 hiscore.rule++;
1023 }
1024 if (ipv6_saddr_preferred(score.addr_type) ||
6ae5f983 1025 (((ifa->flags &
95c385b4 1026 (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)) == 0))) {
072047e4
YH		 1027 score.attrs |= IPV6_SADDR_SCORE_PREFERRED;
1028 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)) {
1029 score.rule = 3;
1030 goto record_it;
1031 }
1032 } else {
1033 if (hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)
1034 continue;
1035 }
1da177e4 1036
3b9f9a1c 1037 /* Rule 4: Prefer home address */
59fbb3a6 1038#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3b9f9a1c
NT		 1039 if (hiscore.rule < 4) {
1040 if (ifa_result->flags & IFA_F_HOMEADDRESS)
1041 hiscore.attrs |= IPV6_SADDR_SCORE_HOA;
1042 hiscore.rule++;
1043 }
1044 if (ifa->flags & IFA_F_HOMEADDRESS) {
1045 score.attrs |= IPV6_SADDR_SCORE_HOA;
1046 if (!(ifa_result->flags & IFA_F_HOMEADDRESS)) {
1047 score.rule = 4;
1048 goto record_it;
1049 }
1050 } else {
1051 if (hiscore.attrs & IPV6_SADDR_SCORE_HOA)
1052 continue;
1053 }
1054#else
220bbd74
YH		 1055 if (hiscore.rule < 4)
1056 hiscore.rule++;
3b9f9a1c 1057#endif
072047e4
YH		 1058
1059 /* Rule 5: Prefer outgoing interface */
1060 if (hiscore.rule < 5) {
1061 if (daddr_dev == NULL ||
1062 daddr_dev == ifa_result->idev->dev)
1063 hiscore.attrs |= IPV6_SADDR_SCORE_OIF;
1064 hiscore.rule++;
1065 }
1066 if (daddr_dev == NULL ||
1067 daddr_dev == ifa->idev->dev) {
1068 score.attrs |= IPV6_SADDR_SCORE_OIF;
1069 if (!(hiscore.attrs & IPV6_SADDR_SCORE_OIF)) {
1070 score.rule = 5;
1071 goto record_it;
1072 }
1073 } else {
1074 if (hiscore.attrs & IPV6_SADDR_SCORE_OIF)
1075 continue;
1076 }
1077
1078 /* Rule 6: Prefer matching label */
1079 if (hiscore.rule < 6) {
c1ee656c 1080 if (ipv6_addr_label(&ifa_result->addr,
303065a8
YH		 1081 hiscore.addr_type,
1082 ifa_result->idev->dev->ifindex) == daddr_label)
072047e4
YH		 1083 hiscore.attrs |= IPV6_SADDR_SCORE_LABEL;
1084 hiscore.rule++;
1085 }
c1ee656c 1086 if (ipv6_addr_label(&ifa->addr,
303065a8
YH		 1087 score.addr_type,
1088 ifa->idev->dev->ifindex) == daddr_label) {
072047e4
YH		 1089 score.attrs |= IPV6_SADDR_SCORE_LABEL;
1090 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LABEL)) {
1091 score.rule = 6;
1092 goto record_it;
1da177e4 1093 }
072047e4
YH		 1094 } else {
1095 if (hiscore.attrs & IPV6_SADDR_SCORE_LABEL)
1096 continue;
1097 }
1098
44fd0261 1099#ifdef CONFIG_IPV6_PRIVACY
072047e4
YH		 1100 /* Rule 7: Prefer public address
1101 * Note: prefer temprary address if use_tempaddr >= 2
1102 */
1103 if (hiscore.rule < 7) {
1104 if ((!(ifa_result->flags & IFA_F_TEMPORARY)) ^
1105 (ifa_result->idev->cnf.use_tempaddr >= 2))
1106 hiscore.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1107 hiscore.rule++;
1108 }
1109 if ((!(ifa->flags & IFA_F_TEMPORARY)) ^
1110 (ifa->idev->cnf.use_tempaddr >= 2)) {
1111 score.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1112 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)) {
1113 score.rule = 7;
1114 goto record_it;
1115 }
1116 } else {
1117 if (hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)
1118 continue;
1119 }
5e2707fa
YH		 1120#else
1121 if (hiscore.rule < 7)
1122 hiscore.rule++;
44fd0261 1123#endif
072047e4 1124 /* Rule 8: Use longest matching prefix */
12da2a43 1125 if (hiscore.rule < 8) {
072047e4 1126 hiscore.matchlen = ipv6_addr_diff(&ifa_result->addr, daddr);
12da2a43
YZ		 1127 hiscore.rule++;
1128 }
072047e4
YH		 1129 score.matchlen = ipv6_addr_diff(&ifa->addr, daddr);
1130 if (score.matchlen > hiscore.matchlen) {
1131 score.rule = 8;
1132 goto record_it;
1da177e4 1133 }
072047e4
YH		 1134#if 0
1135 else if (score.matchlen < hiscore.matchlen)
1136 continue;
1137#endif
1138
1139 /* Final Rule: choose first available one */
1140 continue;
1141record_it:
1142 if (ifa_result)
1143 in6_ifa_put(ifa_result);
1144 in6_ifa_hold(ifa);
1145 ifa_result = ifa;
1146 hiscore = score;
1da177e4 1147 }
072047e4 1148 read_unlock_bh(&idev->lock);
1da177e4 1149 }
8814c4b5 1150 rcu_read_unlock();
1da177e4
LT		 1151 read_unlock(&dev_base_lock);
1152
072047e4
YH		 1153 if (!ifa_result)
1154 return -EADDRNOTAVAIL;
1ab1457c 1155
072047e4
YH		 1156 ipv6_addr_copy(saddr, &ifa_result->addr);
1157 in6_ifa_put(ifa_result);
1158 return 0;
1da177e4
LT		 1159}
1160
1161
1162int ipv6_get_saddr(struct dst_entry *dst,
1163 struct in6_addr *daddr, struct in6_addr *saddr)
1164{
7a3025b1 1165 return ipv6_dev_get_saddr(dst ? ip6_dst_idev(dst)->dev : NULL, daddr, saddr);
1da177e4
LT		 1166}
1167
7159039a 1168EXPORT_SYMBOL(ipv6_get_saddr);
1da177e4 1169
95c385b4
NH		 1170int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1171 unsigned char banned_flags)
1da177e4
LT		 1172{
1173 struct inet6_dev *idev;
1174 int err = -EADDRNOTAVAIL;
1175
8814c4b5 1176 rcu_read_lock();
1da177e4
LT		 1177 if ((idev = __in6_dev_get(dev)) != NULL) {
1178 struct inet6_ifaddr *ifp;
1179
1180 read_lock_bh(&idev->lock);
1181 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
95c385b4 1182 if (ifp->scope == IFA_LINK && !(ifp->flags & banned_flags)) {
1da177e4
LT		 1183 ipv6_addr_copy(addr, &ifp->addr);
1184 err = 0;
1185 break;
1186 }
1187 }
1188 read_unlock_bh(&idev->lock);
1189 }
8814c4b5 1190 rcu_read_unlock();
1da177e4
LT		 1191 return err;
1192}
1193
1194static int ipv6_count_addresses(struct inet6_dev *idev)
1195{
1196 int cnt = 0;
1197 struct inet6_ifaddr *ifp;
1198
1199 read_lock_bh(&idev->lock);
1200 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1201 cnt++;
1202 read_unlock_bh(&idev->lock);
1203 return cnt;
1204}
1205
1206int ipv6_chk_addr(struct in6_addr *addr, struct net_device *dev, int strict)
1207{
1208 struct inet6_ifaddr * ifp;
1209 u8 hash = ipv6_addr_hash(addr);
1210
1211 read_lock_bh(&addrconf_hash_lock);
1212 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1213 if (ipv6_addr_equal(&ifp->addr, addr) &&
1214 !(ifp->flags&IFA_F_TENTATIVE)) {
1215 if (dev == NULL || ifp->idev->dev == dev ||
1216 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1217 break;
1218 }
1219 }
1220 read_unlock_bh(&addrconf_hash_lock);
1221 return ifp != NULL;
1222}
1223
7159039a
YH		 1224EXPORT_SYMBOL(ipv6_chk_addr);
1225
1da177e4
LT		 1226static
1227int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev)
1228{
1229 struct inet6_ifaddr * ifp;
1230 u8 hash = ipv6_addr_hash(addr);
1231
1232 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1233 if (ipv6_addr_equal(&ifp->addr, addr)) {
1234 if (dev == NULL || ifp->idev->dev == dev)
1235 break;
1236 }
1237 }
1238 return ifp != NULL;
1239}
1240
1241struct inet6_ifaddr * ipv6_get_ifaddr(struct in6_addr *addr, struct net_device *dev, int strict)
1242{
1243 struct inet6_ifaddr * ifp;
1244 u8 hash = ipv6_addr_hash(addr);
1245
1246 read_lock_bh(&addrconf_hash_lock);
1247 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1248 if (ipv6_addr_equal(&ifp->addr, addr)) {
1249 if (dev == NULL || ifp->idev->dev == dev ||
1250 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1251 in6_ifa_hold(ifp);
1252 break;
1253 }
1254 }
1255 }
1256 read_unlock_bh(&addrconf_hash_lock);
1257
1258 return ifp;
1259}
1260
1261int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1262{
1263 const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
0fa1a53e 1264 const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
82103232
AV		 1265 __be32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
1266 __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1da177e4 1267 int sk_ipv6only = ipv6_only_sock(sk);
463c84b9 1268 int sk2_ipv6only = inet_v6_ipv6only(sk2);
1da177e4
LT		 1269 int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1270 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1271
1272 if (!sk2_rcv_saddr && !sk_ipv6only)
1273 return 1;
1274
1275 if (addr_type2 == IPV6_ADDR_ANY &&
1276 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1277 return 1;
1278
1279 if (addr_type == IPV6_ADDR_ANY &&
1280 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1281 return 1;
1282
1283 if (sk2_rcv_saddr6 &&
1284 ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1285 return 1;
1286
1287 if (addr_type == IPV6_ADDR_MAPPED &&
1288 !sk2_ipv6only &&
1289 (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1290 return 1;
1291
1292 return 0;
1293}
1294
1295/* Gets referenced address, destroys ifaddr */
1296
9f5336e2 1297static void addrconf_dad_stop(struct inet6_ifaddr *ifp)
1da177e4 1298{
1da177e4
LT		 1299 if (ifp->flags&IFA_F_PERMANENT) {
1300 spin_lock_bh(&ifp->lock);
1301 addrconf_del_timer(ifp);
1302 ifp->flags |= IFA_F_TENTATIVE;
1303 spin_unlock_bh(&ifp->lock);
1304 in6_ifa_put(ifp);
1305#ifdef CONFIG_IPV6_PRIVACY
1306 } else if (ifp->flags&IFA_F_TEMPORARY) {
1307 struct inet6_ifaddr *ifpub;
1308 spin_lock_bh(&ifp->lock);
1309 ifpub = ifp->ifpub;
1310 if (ifpub) {
1311 in6_ifa_hold(ifpub);
1312 spin_unlock_bh(&ifp->lock);
1313 ipv6_create_tempaddr(ifpub, ifp);
1314 in6_ifa_put(ifpub);
1315 } else {
1316 spin_unlock_bh(&ifp->lock);
1317 }
1318 ipv6_del_addr(ifp);
1319#endif
1320 } else
1321 ipv6_del_addr(ifp);
1322}
1323
3c21edbd
YH		 1324void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1325{
1326 if (net_ratelimit())
1327 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1328 addrconf_dad_stop(ifp);
1329}
1da177e4
LT		 1330
1331/* Join to solicited addr multicast group. */
1332
1333void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1334{
1335 struct in6_addr maddr;
1336
1337 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1338 return;
1339
1340 addrconf_addr_solict_mult(addr, &maddr);
1341 ipv6_dev_mc_inc(dev, &maddr);
1342}
1343
1344void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1345{
1346 struct in6_addr maddr;
1347
1348 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1349 return;
1350
1351 addrconf_addr_solict_mult(addr, &maddr);
1352 __ipv6_dev_mc_dec(idev, &maddr);
1353}
1354
20380731 1355static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1356{
1357 struct in6_addr addr;
1358 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1359 if (ipv6_addr_any(&addr))
1360 return;
1361 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1362}
1363
20380731 1364static void addrconf_leave_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_dec(ifp->idev, &addr);
1371}
1372
073a8e0e
YH		 1373static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1374{
1375 if (dev->addr_len != ETH_ALEN)
1376 return -1;
1377 memcpy(eui, dev->dev_addr, 3);
1378 memcpy(eui + 5, dev->dev_addr + 3, 3);
1379
1380 /*
1381 * The zSeries OSA network cards can be shared among various
1382 * OS instances, but the OSA cards have only one MAC address.
1383 * This leads to duplicate address conflicts in conjunction
1384 * with IPv6 if more than one instance uses the same card.
1385 *
1386 * The driver for these cards can deliver a unique 16-bit
1387 * identifier for each instance sharing the same card. It is
1388 * placed instead of 0xFFFE in the interface identifier. The
1389 * "u" bit of the interface identifier is not inverted in this
1390 * case. Hence the resulting interface identifier has local
1391 * scope according to RFC2373.
1392 */
1393 if (dev->dev_id) {
1394 eui[3] = (dev->dev_id >> 8) & 0xFF;
1395 eui[4] = dev->dev_id & 0xFF;
1396 } else {
1397 eui[3] = 0xFF;
1398 eui[4] = 0xFE;
1399 eui[0] ^= 2;
1400 }
1401 return 0;
1402}
1403
1404static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1405{
1406 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1407 if (dev->addr_len != ARCNET_ALEN)
1408 return -1;
1409 memset(eui, 0, 7);
1410 eui[7] = *(u8*)dev->dev_addr;
1411 return 0;
1412}
1413
1414static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1415{
1416 if (dev->addr_len != INFINIBAND_ALEN)
1417 return -1;
1418 memcpy(eui, dev->dev_addr + 12, 8);
1419 eui[0] |= 2;
1420 return 0;
1421}
1422
1da177e4
LT		 1423static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1424{
1425 switch (dev->type) {
1426 case ARPHRD_ETHER:
1427 case ARPHRD_FDDI:
1428 case ARPHRD_IEEE802_TR:
073a8e0e 1429 return addrconf_ifid_eui48(eui, dev);
1da177e4 1430 case ARPHRD_ARCNET:
073a8e0e 1431 return addrconf_ifid_arcnet(eui, dev);
1da177e4 1432 case ARPHRD_INFINIBAND:
073a8e0e 1433 return addrconf_ifid_infiniband(eui, dev);
c7dc89c0
FT		 1434 case ARPHRD_SIT:
1435 if (dev->priv_flags & IFF_ISATAP)
1436 return ipv6_isatap_eui64(eui, *(__be32 *)dev->dev_addr);
1da177e4
LT		 1437 }
1438 return -1;
1439}
1440
1441static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1442{
1443 int err = -1;
1444 struct inet6_ifaddr *ifp;
1445
1446 read_lock_bh(&idev->lock);
1447 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1448 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1449 memcpy(eui, ifp->addr.s6_addr+8, 8);
1450 err = 0;
1451 break;
1452 }
1453 }
1454 read_unlock_bh(&idev->lock);
1455 return err;
1456}
1457
1458#ifdef CONFIG_IPV6_PRIVACY
1459/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1460static int __ipv6_regen_rndid(struct inet6_dev *idev)
1461{
1da177e4 1462regen:
955189ef 1463 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1da177e4 1464 idev->rndid[0] &= ~0x02;
1da177e4
LT		 1465
1466 /*
1467 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1468 * check if generated address is not inappropriate
1469 *
1470 * - Reserved subnet anycast (RFC 2526)
1471 * 11111101 11....11 1xxxxxxx
c7dc89c0 1472 * - ISATAP (RFC4214) 6.1
1da177e4
LT		 1473 * 00-00-5E-FE-xx-xx-xx-xx
1474 * - value 0
1475 * - XXX: already assigned to an address on the device
1476 */
1ab1457c 1477 if (idev->rndid[0] == 0xfd &&
1da177e4
LT		 1478 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1479 (idev->rndid[7]&0x80))
1480 goto regen;
1481 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1482 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1483 goto regen;
1484 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1485 goto regen;
1486 }
1487
1488 return 0;
1489}
1490
1491static void ipv6_regen_rndid(unsigned long data)
1492{
1493 struct inet6_dev *idev = (struct inet6_dev *) data;
1494 unsigned long expires;
1495
8814c4b5 1496 rcu_read_lock_bh();
1da177e4
LT		 1497 write_lock_bh(&idev->lock);
1498
1499 if (idev->dead)
1500 goto out;
1501
1502 if (__ipv6_regen_rndid(idev) < 0)
1503 goto out;
1ab1457c 1504
1da177e4 1505 expires = jiffies +
1ab1457c 1506 idev->cnf.temp_prefered_lft * HZ -
1da177e4
LT		 1507 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1508 if (time_before(expires, jiffies)) {
1509 printk(KERN_WARNING
1510 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1511 idev->dev->name);
1512 goto out;
1513 }
1514
1515 if (!mod_timer(&idev->regen_timer, expires))
1516 in6_dev_hold(idev);
1517
1518out:
1519 write_unlock_bh(&idev->lock);
8814c4b5 1520 rcu_read_unlock_bh();
1da177e4
LT		 1521 in6_dev_put(idev);
1522}
1523
1524static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1525 int ret = 0;
1526
1527 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1528 ret = __ipv6_regen_rndid(idev);
1529 return ret;
1530}
1531#endif
1532
1533/*
1534 * Add prefix route.
1535 */
1536
1537static void
1538addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
e431b8c0 1539 unsigned long expires, u32 flags)
1da177e4 1540{
86872cb5
TG		 1541 struct fib6_config cfg = {
1542 .fc_table = RT6_TABLE_PREFIX,
1543 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1544 .fc_ifindex = dev->ifindex,
1545 .fc_expires = expires,
1546 .fc_dst_len = plen,
1547 .fc_flags = RTF_UP | flags,
1548 };
1da177e4 1549
86872cb5 1550 ipv6_addr_copy(&cfg.fc_dst, pfx);
1da177e4
LT		 1551
1552 /* Prevent useless cloning on PtP SIT.
1553 This thing is done here expecting that the whole
1554 class of non-broadcast devices need not cloning.
1555 */
0be669bb 1556#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
86872cb5
TG		 1557 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1558 cfg.fc_flags |= RTF_NONEXTHOP;
0be669bb 1559#endif
1da177e4 1560
86872cb5 1561 ip6_route_add(&cfg);
1da177e4
LT		 1562}
1563
1564/* Create "default" multicast route to the interface */
1565
1566static void addrconf_add_mroute(struct net_device *dev)
1567{
86872cb5
TG		 1568 struct fib6_config cfg = {
1569 .fc_table = RT6_TABLE_LOCAL,
1570 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1571 .fc_ifindex = dev->ifindex,
1572 .fc_dst_len = 8,
1573 .fc_flags = RTF_UP,
1574 };
1575
1576 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1577
1578 ip6_route_add(&cfg);
1da177e4
LT		 1579}
1580
0be669bb 1581#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 1582static void sit_route_add(struct net_device *dev)
1583{
86872cb5
TG		 1584 struct fib6_config cfg = {
1585 .fc_table = RT6_TABLE_MAIN,
1586 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1587 .fc_ifindex = dev->ifindex,
1588 .fc_dst_len = 96,
1589 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1590 };
1da177e4
LT		 1591
1592 /* prefix length - 96 bits "::d.d.d.d" */
86872cb5 1593 ip6_route_add(&cfg);
1da177e4 1594}
0be669bb 1595#endif
1da177e4
LT		 1596
1597static void addrconf_add_lroute(struct net_device *dev)
1598{
1599 struct in6_addr addr;
1600
1601 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1602 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1603}
1604
1605static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1606{
1607 struct inet6_dev *idev;
1608
1609 ASSERT_RTNL();
1610
1611 if ((idev = ipv6_find_idev(dev)) == NULL)
1612 return NULL;
1613
1614 /* Add default multicast route */
1615 addrconf_add_mroute(dev);
1616
1617 /* Add link local route */
1618 addrconf_add_lroute(dev);
1619 return idev;
1620}
1621
1622void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1623{
1624 struct prefix_info *pinfo;
1625 __u32 valid_lft;
1626 __u32 prefered_lft;
1627 int addr_type;
1628 unsigned long rt_expires;
1629 struct inet6_dev *in6_dev;
1630
1631 pinfo = (struct prefix_info *) opt;
1ab1457c 1632
1da177e4
LT		 1633 if (len < sizeof(struct prefix_info)) {
1634 ADBG(("addrconf: prefix option too short\n"));
1635 return;
1636 }
1ab1457c 1637
1da177e4
LT		 1638 /*
1639 * Validation checks ([ADDRCONF], page 19)
1640 */
1641
1642 addr_type = ipv6_addr_type(&pinfo->prefix);
1643
1644 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1645 return;
1646
1647 valid_lft = ntohl(pinfo->valid);
1648 prefered_lft = ntohl(pinfo->prefered);
1649
1650 if (prefered_lft > valid_lft) {
1651 if (net_ratelimit())
1652 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1653 return;
1654 }
1655
1656 in6_dev = in6_dev_get(dev);
1657
1658 if (in6_dev == NULL) {
1659 if (net_ratelimit())
1660 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1661 return;
1662 }
1663
1664 /*
1665 * Two things going on here:
1666 * 1) Add routes for on-link prefixes
1667 * 2) Configure prefixes with the auto flag set
1668 */
1669
1670 /* Avoid arithmetic overflow. Really, we could
1671 save rt_expires in seconds, likely valid_lft,
1672 but it would require division in fib gc, that it
1673 not good.
1674 */
1675 if (valid_lft >= 0x7FFFFFFF/HZ)
3dd4bc68 1676 rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ);
1da177e4 1677 else
3dd4bc68
YH		 1678 rt_expires = valid_lft * HZ;
1679
1680 /*
1681 * We convert this (in jiffies) to clock_t later.
1682 * Avoid arithmetic overflow there as well.
1683 * Overflow can happen only if HZ < USER_HZ.
1684 */
1685 if (HZ < USER_HZ && rt_expires > 0x7FFFFFFF / USER_HZ)
1686 rt_expires = 0x7FFFFFFF / USER_HZ;
1da177e4
LT		 1687
1688 if (pinfo->onlink) {
1689 struct rt6_info *rt;
1690 rt = rt6_lookup(&pinfo->prefix, NULL, dev->ifindex, 1);
1691
1692 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
1693 if (rt->rt6i_flags&RTF_EXPIRES) {
1694 if (valid_lft == 0) {
e0a1ad73 1695 ip6_del_rt(rt);
1da177e4
LT		 1696 rt = NULL;
1697 } else {
3dd4bc68 1698 rt->rt6i_expires = jiffies + rt_expires;
1da177e4
LT		 1699 }
1700 }
1701 } else if (valid_lft) {
1702 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
3dd4bc68 1703 dev, jiffies_to_clock_t(rt_expires), RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT);
1da177e4
LT		 1704 }
1705 if (rt)
1706 dst_release(&rt->u.dst);
1707 }
1708
1709 /* Try to figure out our local address for this prefix */
1710
1711 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1712 struct inet6_ifaddr * ifp;
1713 struct in6_addr addr;
1714 int create = 0, update_lft = 0;
1715
1716 if (pinfo->prefix_len == 64) {
1717 memcpy(&addr, &pinfo->prefix, 8);
1718 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1719 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1720 in6_dev_put(in6_dev);
1721 return;
1722 }
1723 goto ok;
1724 }
1725 if (net_ratelimit())
1726 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1727 pinfo->prefix_len);
1728 in6_dev_put(in6_dev);
1729 return;
1730
1731ok:
1732
1733 ifp = ipv6_get_ifaddr(&addr, dev, 1);
1734
1735 if (ifp == NULL && valid_lft) {
1736 int max_addresses = in6_dev->cnf.max_addresses;
95c385b4
NH		 1737 u32 addr_flags = 0;
1738
1739#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1740 if (in6_dev->cnf.optimistic_dad &&
1741 !ipv6_devconf.forwarding)
1742 addr_flags = IFA_F_OPTIMISTIC;
1743#endif
1da177e4
LT		 1744
1745 /* Do not allow to create too much of autoconfigured
1746 * addresses; this would be too easy way to crash kernel.
1747 */
1748 if (!max_addresses ||
1749 ipv6_count_addresses(in6_dev) < max_addresses)
1750 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
95c385b4
NH		 1751 addr_type&IPV6_ADDR_SCOPE_MASK,
1752 addr_flags);
1da177e4
LT		 1753
1754 if (!ifp || IS_ERR(ifp)) {
1755 in6_dev_put(in6_dev);
1756 return;
1757 }
1758
1759 update_lft = create = 1;
1760 ifp->cstamp = jiffies;
1761 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1762 }
1763
1764 if (ifp) {
1765 int flags;
1766 unsigned long now;
1767#ifdef CONFIG_IPV6_PRIVACY
1768 struct inet6_ifaddr *ift;
1769#endif
1770 u32 stored_lft;
1771
1772 /* update lifetime (RFC2462 5.5.3 e) */
1773 spin_lock(&ifp->lock);
1774 now = jiffies;
1775 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1776 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1777 else
1778 stored_lft = 0;
1779 if (!update_lft && stored_lft) {
1780 if (valid_lft > MIN_VALID_LIFETIME ||
1781 valid_lft > stored_lft)
1782 update_lft = 1;
1783 else if (stored_lft <= MIN_VALID_LIFETIME) {
1784 /* valid_lft <= stored_lft is always true */
1785 /* XXX: IPsec */
1786 update_lft = 0;
1787 } else {
1788 valid_lft = MIN_VALID_LIFETIME;
1789 if (valid_lft < prefered_lft)
1790 prefered_lft = valid_lft;
1791 update_lft = 1;
1792 }
1793 }
1794
1795 if (update_lft) {
1796 ifp->valid_lft = valid_lft;
1797 ifp->prefered_lft = prefered_lft;
1798 ifp->tstamp = now;
1799 flags = ifp->flags;
1800 ifp->flags &= ~IFA_F_DEPRECATED;
1801 spin_unlock(&ifp->lock);
1802
1803 if (!(flags&IFA_F_TENTATIVE))
1804 ipv6_ifa_notify(0, ifp);
1805 } else
1806 spin_unlock(&ifp->lock);
1807
1808#ifdef CONFIG_IPV6_PRIVACY
1809 read_lock_bh(&in6_dev->lock);
1810 /* update all temporary addresses in the list */
1811 for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1812 /*
1813 * When adjusting the lifetimes of an existing
1814 * temporary address, only lower the lifetimes.
1815 * Implementations must not increase the
1816 * lifetimes of an existing temporary address
1817 * when processing a Prefix Information Option.
1818 */
1819 spin_lock(&ift->lock);
1820 flags = ift->flags;
1821 if (ift->valid_lft > valid_lft &&
1822 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1823 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1824 if (ift->prefered_lft > prefered_lft &&
1825 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1826 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1827 spin_unlock(&ift->lock);
1828 if (!(flags&IFA_F_TENTATIVE))
1829 ipv6_ifa_notify(0, ift);
1830 }
1831
1832 if (create && in6_dev->cnf.use_tempaddr > 0) {
1833 /*
1834 * When a new public address is created as described in [ADDRCONF],
1835 * also create a new temporary address.
1836 */
1ab1457c 1837 read_unlock_bh(&in6_dev->lock);
1da177e4
LT		 1838 ipv6_create_tempaddr(ifp, NULL);
1839 } else {
1840 read_unlock_bh(&in6_dev->lock);
1841 }
1842#endif
1843 in6_ifa_put(ifp);
1844 addrconf_verify(0);
1845 }
1846 }
1847 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
1848 in6_dev_put(in6_dev);
1849}
1850
1851/*
1852 * Set destination address.
1853 * Special case for SIT interfaces where we create a new "virtual"
1854 * device.
1855 */
1856int addrconf_set_dstaddr(void __user *arg)
1857{
1858 struct in6_ifreq ireq;
1859 struct net_device *dev;
1860 int err = -EINVAL;
1861
1862 rtnl_lock();
1863
1864 err = -EFAULT;
1865 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1866 goto err_exit;
1867
881d966b 1868 dev = __dev_get_by_index(&init_net, ireq.ifr6_ifindex);
1da177e4
LT		 1869
1870 err = -ENODEV;
1871 if (dev == NULL)
1872 goto err_exit;
1873
0be669bb 1874#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 1875 if (dev->type == ARPHRD_SIT) {
1876 struct ifreq ifr;
1877 mm_segment_t oldfs;
1878 struct ip_tunnel_parm p;
1879
1880 err = -EADDRNOTAVAIL;
1881 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
1882 goto err_exit;
1883
1884 memset(&p, 0, sizeof(p));
1885 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
1886 p.iph.saddr = 0;
1887 p.iph.version = 4;
1888 p.iph.ihl = 5;
1889 p.iph.protocol = IPPROTO_IPV6;
1890 p.iph.ttl = 64;
1891 ifr.ifr_ifru.ifru_data = (void __user *)&p;
1892
1893 oldfs = get_fs(); set_fs(KERNEL_DS);
1894 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
1895 set_fs(oldfs);
1896
1897 if (err == 0) {
1898 err = -ENOBUFS;
881d966b 1899 if ((dev = __dev_get_by_name(&init_net, p.name)) == NULL)
1da177e4
LT		 1900 goto err_exit;
1901 err = dev_open(dev);
1902 }
1903 }
0be669bb 1904#endif
1da177e4
LT		 1905
1906err_exit:
1907 rtnl_unlock();
1908 return err;
1909}
1910
1911/*
1912 * Manual configuration of address on an interface
1913 */
0778769d 1914static int inet6_addr_add(int ifindex, struct in6_addr *pfx, int plen,
55ebaef1 1915 __u8 ifa_flags, __u32 prefered_lft, __u32 valid_lft)
1da177e4
LT		 1916{
1917 struct inet6_ifaddr *ifp;
1918 struct inet6_dev *idev;
1919 struct net_device *dev;
1920 int scope;
46d48046 1921 u32 flags = RTF_EXPIRES;
1da177e4
LT		 1922
1923 ASSERT_RTNL();
1ab1457c 1924
0778769d
NT		 1925 /* check the lifetime */
1926 if (!valid_lft || prefered_lft > valid_lft)
1927 return -EINVAL;
1928
881d966b 1929 if ((dev = __dev_get_by_index(&init_net, ifindex)) == NULL)
1da177e4 1930 return -ENODEV;
1ab1457c 1931
1da177e4
LT		 1932 if ((idev = addrconf_add_dev(dev)) == NULL)
1933 return -ENOBUFS;
1934
1935 scope = ipv6_addr_scope(pfx);
1936
46d48046 1937 if (valid_lft == INFINITY_LIFE_TIME) {
0778769d 1938 ifa_flags |= IFA_F_PERMANENT;
46d48046
YH		 1939 flags = 0;
1940 } else if (valid_lft >= 0x7FFFFFFF/HZ)
0778769d
NT		 1941 valid_lft = 0x7FFFFFFF/HZ;
1942
1943 if (prefered_lft == 0)
1944 ifa_flags |= IFA_F_DEPRECATED;
1945 else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
1946 (prefered_lft != INFINITY_LIFE_TIME))
1947 prefered_lft = 0x7FFFFFFF/HZ;
1948
1949 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
1950
1da177e4 1951 if (!IS_ERR(ifp)) {
06aebfb7 1952 spin_lock_bh(&ifp->lock);
0778769d
NT		 1953 ifp->valid_lft = valid_lft;
1954 ifp->prefered_lft = prefered_lft;
1955 ifp->tstamp = jiffies;
06aebfb7 1956 spin_unlock_bh(&ifp->lock);
0778769d 1957
46d48046
YH		 1958 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
1959 jiffies_to_clock_t(valid_lft * HZ), flags);
95c385b4
NH		 1960 /*
1961 * Note that section 3.1 of RFC 4429 indicates
1962 * that the Optimistic flag should not be set for
1963 * manually configured addresses
1964 */
1da177e4
LT		 1965 addrconf_dad_start(ifp, 0);
1966 in6_ifa_put(ifp);
0778769d 1967 addrconf_verify(0);
1da177e4
LT		 1968 return 0;
1969 }
1970
1971 return PTR_ERR(ifp);
1972}
1973
1974static int inet6_addr_del(int ifindex, struct in6_addr *pfx, int plen)
1975{
1976 struct inet6_ifaddr *ifp;
1977 struct inet6_dev *idev;
1978 struct net_device *dev;
1ab1457c 1979
881d966b 1980 if ((dev = __dev_get_by_index(&init_net, ifindex)) == NULL)
1da177e4
LT		 1981 return -ENODEV;
1982
1983 if ((idev = __in6_dev_get(dev)) == NULL)
1984 return -ENXIO;
1985
1986 read_lock_bh(&idev->lock);
1987 for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
1988 if (ifp->prefix_len == plen &&
1989 ipv6_addr_equal(pfx, &ifp->addr)) {
1990 in6_ifa_hold(ifp);
1991 read_unlock_bh(&idev->lock);
1ab1457c 1992
1da177e4
LT		 1993 ipv6_del_addr(ifp);
1994
1995 /* If the last address is deleted administratively,
1996 disable IPv6 on this interface.
1997 */
1998 if (idev->addr_list == NULL)
1999 addrconf_ifdown(idev->dev, 1);
2000 return 0;
2001 }
2002 }
2003 read_unlock_bh(&idev->lock);
2004 return -EADDRNOTAVAIL;
2005}
2006
2007
2008int addrconf_add_ifaddr(void __user *arg)
2009{
2010 struct in6_ifreq ireq;
2011 int err;
1ab1457c 2012
1da177e4
LT		 2013 if (!capable(CAP_NET_ADMIN))
2014 return -EPERM;
1ab1457c 2015
1da177e4
LT		 2016 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2017 return -EFAULT;
2018
2019 rtnl_lock();
0778769d 2020 err = inet6_addr_add(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen,
55ebaef1 2021 IFA_F_PERMANENT, INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4
LT		 2022 rtnl_unlock();
2023 return err;
2024}
2025
2026int addrconf_del_ifaddr(void __user *arg)
2027{
2028 struct in6_ifreq ireq;
2029 int err;
1ab1457c 2030
1da177e4
LT		 2031 if (!capable(CAP_NET_ADMIN))
2032 return -EPERM;
2033
2034 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2035 return -EFAULT;
2036
2037 rtnl_lock();
2038 err = inet6_addr_del(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
2039 rtnl_unlock();
2040 return err;
2041}
2042
0be669bb 2043#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2044static void sit_add_v4_addrs(struct inet6_dev *idev)
2045{
2046 struct inet6_ifaddr * ifp;
2047 struct in6_addr addr;
2048 struct net_device *dev;
2049 int scope;
2050
2051 ASSERT_RTNL();
2052
2053 memset(&addr, 0, sizeof(struct in6_addr));
2054 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2055
2056 if (idev->dev->flags&IFF_POINTOPOINT) {
2057 addr.s6_addr32[0] = htonl(0xfe800000);
2058 scope = IFA_LINK;
2059 } else {
2060 scope = IPV6_ADDR_COMPATv4;
2061 }
2062
2063 if (addr.s6_addr32[3]) {
2064 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
2065 if (!IS_ERR(ifp)) {
2066 spin_lock_bh(&ifp->lock);
2067 ifp->flags &= ~IFA_F_TENTATIVE;
2068 spin_unlock_bh(&ifp->lock);
2069 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2070 in6_ifa_put(ifp);
2071 }
2072 return;
2073 }
2074
881d966b 2075 for_each_netdev(&init_net, dev) {
e5ed6399 2076 struct in_device * in_dev = __in_dev_get_rtnl(dev);
1da177e4
LT		 2077 if (in_dev && (dev->flags & IFF_UP)) {
2078 struct in_ifaddr * ifa;
2079
2080 int flag = scope;
2081
2082 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2083 int plen;
2084
2085 addr.s6_addr32[3] = ifa->ifa_local;
2086
2087 if (ifa->ifa_scope == RT_SCOPE_LINK)
2088 continue;
2089 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2090 if (idev->dev->flags&IFF_POINTOPOINT)
2091 continue;
2092 flag |= IFA_HOST;
2093 }
2094 if (idev->dev->flags&IFF_POINTOPOINT)
2095 plen = 64;
2096 else
2097 plen = 96;
2098
2099 ifp = ipv6_add_addr(idev, &addr, plen, flag,
2100 IFA_F_PERMANENT);
2101 if (!IS_ERR(ifp)) {
2102 spin_lock_bh(&ifp->lock);
2103 ifp->flags &= ~IFA_F_TENTATIVE;
2104 spin_unlock_bh(&ifp->lock);
2105 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2106 in6_ifa_put(ifp);
2107 }
2108 }
2109 }
1ab1457c 2110 }
1da177e4 2111}
0be669bb 2112#endif
1da177e4
LT		 2113
2114static void init_loopback(struct net_device *dev)
2115{
2116 struct inet6_dev *idev;
2117 struct inet6_ifaddr * ifp;
2118
2119 /* ::1 */
2120
2121 ASSERT_RTNL();
2122
2123 if ((idev = ipv6_find_idev(dev)) == NULL) {
2124 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2125 return;
2126 }
2127
2128 ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
2129 if (!IS_ERR(ifp)) {
2130 spin_lock_bh(&ifp->lock);
2131 ifp->flags &= ~IFA_F_TENTATIVE;
2132 spin_unlock_bh(&ifp->lock);
2133 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2134 in6_ifa_put(ifp);
2135 }
2136}
2137
2138static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2139{
2140 struct inet6_ifaddr * ifp;
95c385b4
NH		 2141 u32 addr_flags = IFA_F_PERMANENT;
2142
2143#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2144 if (idev->cnf.optimistic_dad &&
2145 !ipv6_devconf.forwarding)
2146 addr_flags |= IFA_F_OPTIMISTIC;
2147#endif
1da177e4 2148
95c385b4
NH		 2149
2150 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
1da177e4 2151 if (!IS_ERR(ifp)) {
46d48046 2152 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
1da177e4
LT		 2153 addrconf_dad_start(ifp, 0);
2154 in6_ifa_put(ifp);
2155 }
2156}
2157
2158static void addrconf_dev_config(struct net_device *dev)
2159{
2160 struct in6_addr addr;
2161 struct inet6_dev * idev;
2162
2163 ASSERT_RTNL();
2164
74235a25
HX		 2165 if ((dev->type != ARPHRD_ETHER) &&
2166 (dev->type != ARPHRD_FDDI) &&
2167 (dev->type != ARPHRD_IEEE802_TR) &&
2168 (dev->type != ARPHRD_ARCNET) &&
2169 (dev->type != ARPHRD_INFINIBAND)) {
2170 /* Alas, we support only Ethernet autoconfiguration. */
2171 return;
2172 }
2173
1da177e4
LT		 2174 idev = addrconf_add_dev(dev);
2175 if (idev == NULL)
2176 return;
2177
2178 memset(&addr, 0, sizeof(struct in6_addr));
2179 addr.s6_addr32[0] = htonl(0xFE800000);
2180
2181 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2182 addrconf_add_linklocal(idev, &addr);
2183}
2184
0be669bb 2185#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2186static void addrconf_sit_config(struct net_device *dev)
2187{
2188 struct inet6_dev *idev;
2189
2190 ASSERT_RTNL();
2191
1ab1457c
YH		 2192 /*
2193 * Configure the tunnel with one of our IPv4
2194 * addresses... we should configure all of
1da177e4
LT		 2195 * our v4 addrs in the tunnel
2196 */
2197
2198 if ((idev = ipv6_find_idev(dev)) == NULL) {
2199 printk(KERN_DEBUG "init sit: add_dev failed\n");
2200 return;
2201 }
2202
c7dc89c0
FT		 2203 if (dev->priv_flags & IFF_ISATAP) {
2204 struct in6_addr addr;
2205
2206 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2207 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2208 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2209 addrconf_add_linklocal(idev, &addr);
2210 return;
2211 }
2212
1da177e4
LT		 2213 sit_add_v4_addrs(idev);
2214
2215 if (dev->flags&IFF_POINTOPOINT) {
2216 addrconf_add_mroute(dev);
2217 addrconf_add_lroute(dev);
2218 } else
2219 sit_route_add(dev);
2220}
0be669bb 2221#endif
1da177e4
LT		 2222
2223static inline int
2224ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2225{
2226 struct in6_addr lladdr;
2227
95c385b4 2228 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
1da177e4
LT		 2229 addrconf_add_linklocal(idev, &lladdr);
2230 return 0;
2231 }
2232 return -1;
2233}
2234
2235static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2236{
2237 struct net_device *link_dev;
2238
2239 /* first try to inherit the link-local address from the link device */
2240 if (idev->dev->iflink &&
881d966b 2241 (link_dev = __dev_get_by_index(&init_net, idev->dev->iflink))) {
1da177e4
LT		 2242 if (!ipv6_inherit_linklocal(idev, link_dev))
2243 return;
2244 }
2245 /* then try to inherit it from any device */
881d966b 2246 for_each_netdev(&init_net, link_dev) {
1da177e4
LT		 2247 if (!ipv6_inherit_linklocal(idev, link_dev))
2248 return;
2249 }
2250 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2251}
2252
2253/*
2254 * Autoconfigure tunnel with a link-local address so routing protocols,
2255 * DHCPv6, MLD etc. can be run over the virtual link
2256 */
2257
2258static void addrconf_ip6_tnl_config(struct net_device *dev)
2259{
2260 struct inet6_dev *idev;
2261
2262 ASSERT_RTNL();
2263
2264 if ((idev = addrconf_add_dev(dev)) == NULL) {
2265 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2266 return;
2267 }
2268 ip6_tnl_add_linklocal(idev);
1da177e4
LT		 2269}
2270
1ab1457c 2271static int addrconf_notify(struct notifier_block *this, unsigned long event,
1da177e4
LT		 2272 void * data)
2273{
2274 struct net_device *dev = (struct net_device *) data;
74235a25 2275 struct inet6_dev *idev = __in6_dev_get(dev);
c5e33bdd 2276 int run_pending = 0;
b217d616 2277 int err;
1da177e4 2278
e9dc8653
EB		 2279 if (dev->nd_net != &init_net)
2280 return NOTIFY_DONE;
2281
1da177e4 2282 switch(event) {
45ba9dd2 2283 case NETDEV_REGISTER:
74235a25 2284 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
45ba9dd2
YH		 2285 idev = ipv6_add_dev(dev);
2286 if (!idev)
b217d616 2287 return notifier_from_errno(-ENOMEM);
45ba9dd2
YH		 2288 }
2289 break;
1da177e4 2290 case NETDEV_UP:
3c21edbd 2291 case NETDEV_CHANGE:
c2edacf8
JV		 2292 if (dev->flags & IFF_SLAVE)
2293 break;
2294
3c21edbd 2295 if (event == NETDEV_UP) {
f24e3d65 2296 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 2297 /* device is not ready yet. */
2298 printk(KERN_INFO
2299 "ADDRCONF(NETDEV_UP): %s: "
2300 "link is not ready\n",
2301 dev->name);
2302 break;
2303 }
99081049 2304
d31c7b8f
EP		 2305 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2306 idev = ipv6_add_dev(dev);
2307
99081049
KS		 2308 if (idev)
2309 idev->if_flags |= IF_READY;
3c21edbd 2310 } else {
f24e3d65 2311 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 2312 /* device is still not ready. */
2313 break;
2314 }
2315
2316 if (idev) {
2317 if (idev->if_flags & IF_READY) {
2318 /* device is already configured. */
2319 break;
2320 }
2321 idev->if_flags |= IF_READY;
2322 }
2323
2324 printk(KERN_INFO
2325 "ADDRCONF(NETDEV_CHANGE): %s: "
2326 "link becomes ready\n",
2327 dev->name);
2328
c5e33bdd 2329 run_pending = 1;
3c21edbd
YH		 2330 }
2331
1da177e4 2332 switch(dev->type) {
0be669bb 2333#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2334 case ARPHRD_SIT:
2335 addrconf_sit_config(dev);
2336 break;
0be669bb 2337#endif
1da177e4
LT		 2338 case ARPHRD_TUNNEL6:
2339 addrconf_ip6_tnl_config(dev);
2340 break;
2341 case ARPHRD_LOOPBACK:
2342 init_loopback(dev);
2343 break;
2344
2345 default:
2346 addrconf_dev_config(dev);
2347 break;
3ff50b79 2348 }
1da177e4 2349 if (idev) {
c5e33bdd
YH		 2350 if (run_pending)
2351 addrconf_dad_run(idev);
2352
1da177e4
LT		 2353 /* If the MTU changed during the interface down, when the
2354 interface up, the changed MTU must be reflected in the
2355 idev as well as routers.
2356 */
2357 if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2358 rt6_mtu_change(dev, dev->mtu);
2359 idev->cnf.mtu6 = dev->mtu;
2360 }
2361 idev->tstamp = jiffies;
2362 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2363 /* If the changed mtu during down is lower than IPV6_MIN_MTU
2364 stop IPv6 on this interface.
2365 */
2366 if (dev->mtu < IPV6_MIN_MTU)
2367 addrconf_ifdown(dev, event != NETDEV_DOWN);
2368 }
2369 break;
2370
2371 case NETDEV_CHANGEMTU:
d31c7b8f 2372 if (idev && dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 2373 rt6_mtu_change(dev, dev->mtu);
2374 idev->cnf.mtu6 = dev->mtu;
2375 break;
2376 }
2377
d31c7b8f
EP		 2378 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2379 idev = ipv6_add_dev(dev);
2380 if (idev)
2381 break;
2382 }
2383
1da177e4
LT		 2384 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2385
2386 case NETDEV_DOWN:
2387 case NETDEV_UNREGISTER:
2388 /*
2389 * Remove all addresses from this interface.
2390 */
2391 addrconf_ifdown(dev, event != NETDEV_DOWN);
2392 break;
3c21edbd 2393
1da177e4 2394 case NETDEV_CHANGENAME:
1da177e4 2395 if (idev) {
5632c515
SH		 2396 snmp6_unregister_dev(idev);
2397#ifdef CONFIG_SYSCTL
1da177e4
LT		 2398 addrconf_sysctl_unregister(&idev->cnf);
2399 neigh_sysctl_unregister(idev->nd_parms);
2400 neigh_sysctl_register(dev, idev->nd_parms,
2401 NET_IPV6, NET_IPV6_NEIGH, "ipv6",
2402 &ndisc_ifinfo_sysctl_change,
2403 NULL);
f52295a9 2404 addrconf_sysctl_register(idev);
1da177e4 2405#endif
b217d616
HX		 2406 err = snmp6_register_dev(idev);
2407 if (err)
2408 return notifier_from_errno(err);
5632c515 2409 }
1da177e4 2410 break;
3ff50b79 2411 }
1da177e4
LT		 2412
2413 return NOTIFY_OK;
2414}
2415
2416/*
2417 * addrconf module should be notified of a device going up
2418 */
2419static struct notifier_block ipv6_dev_notf = {
2420 .notifier_call = addrconf_notify,
2421 .priority = 0
2422};
2423
2424static int addrconf_ifdown(struct net_device *dev, int how)
2425{
2426 struct inet6_dev *idev;
2427 struct inet6_ifaddr *ifa, **bifa;
2428 int i;
2429
2430 ASSERT_RTNL();
2431
2774c7ab 2432 if (dev == init_net.loopback_dev && how == 1)
1da177e4
LT		 2433 how = 0;
2434
2435 rt6_ifdown(dev);
2436 neigh_ifdown(&nd_tbl, dev);
2437
2438 idev = __in6_dev_get(dev);
2439 if (idev == NULL)
2440 return -ENODEV;
2441
2442 /* Step 1: remove reference to ipv6 device from parent device.
1ab1457c 2443 Do not dev_put!
1da177e4
LT		 2444 */
2445 if (how == 1) {
1da177e4 2446 idev->dead = 1;
8814c4b5
YH		 2447
2448 /* protected by rtnl_lock */
2449 rcu_assign_pointer(dev->ip6_ptr, NULL);
1da177e4
LT		 2450
2451 /* Step 1.5: remove snmp6 entry */
2452 snmp6_unregister_dev(idev);
2453
2454 }
2455
2456 /* Step 2: clear hash table */
2457 for (i=0; i<IN6_ADDR_HSIZE; i++) {
2458 bifa = &inet6_addr_lst[i];
2459
2460 write_lock_bh(&addrconf_hash_lock);
2461 while ((ifa = *bifa) != NULL) {
2462 if (ifa->idev == idev) {
2463 *bifa = ifa->lst_next;
2464 ifa->lst_next = NULL;
2465 addrconf_del_timer(ifa);
2466 in6_ifa_put(ifa);
2467 continue;
2468 }
2469 bifa = &ifa->lst_next;
2470 }
2471 write_unlock_bh(&addrconf_hash_lock);
2472 }
2473
2474 write_lock_bh(&idev->lock);
2475
2476 /* Step 3: clear flags for stateless addrconf */
2477 if (how != 1)
3c21edbd 2478 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4
LT		 2479
2480 /* Step 4: clear address list */
2481#ifdef CONFIG_IPV6_PRIVACY
2482 if (how == 1 && del_timer(&idev->regen_timer))
2483 in6_dev_put(idev);
2484
2485 /* clear tempaddr list */
2486 while ((ifa = idev->tempaddr_list) != NULL) {
2487 idev->tempaddr_list = ifa->tmp_next;
2488 ifa->tmp_next = NULL;
2489 ifa->dead = 1;
2490 write_unlock_bh(&idev->lock);
2491 spin_lock_bh(&ifa->lock);
2492
2493 if (ifa->ifpub) {
2494 in6_ifa_put(ifa->ifpub);
2495 ifa->ifpub = NULL;
2496 }
2497 spin_unlock_bh(&ifa->lock);
2498 in6_ifa_put(ifa);
2499 write_lock_bh(&idev->lock);
2500 }
2501#endif
2502 while ((ifa = idev->addr_list) != NULL) {
2503 idev->addr_list = ifa->if_next;
2504 ifa->if_next = NULL;
2505 ifa->dead = 1;
2506 addrconf_del_timer(ifa);
2507 write_unlock_bh(&idev->lock);
2508
2509 __ipv6_ifa_notify(RTM_DELADDR, ifa);
063ed369 2510 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
1da177e4
LT		 2511 in6_ifa_put(ifa);
2512
2513 write_lock_bh(&idev->lock);
2514 }
2515 write_unlock_bh(&idev->lock);
2516
2517 /* Step 5: Discard multicast list */
2518
2519 if (how == 1)
2520 ipv6_mc_destroy_dev(idev);
2521 else
2522 ipv6_mc_down(idev);
2523
1da177e4 2524 idev->tstamp = jiffies;
1ab1457c 2525
1da177e4
LT		 2526 /* Shot the device (if unregistered) */
2527
2528 if (how == 1) {
2529#ifdef CONFIG_SYSCTL
2530 addrconf_sysctl_unregister(&idev->cnf);
2531 neigh_sysctl_unregister(idev->nd_parms);
2532#endif
2533 neigh_parms_release(&nd_tbl, idev->nd_parms);
2534 neigh_ifdown(&nd_tbl, dev);
2535 in6_dev_put(idev);
2536 }
2537 return 0;
2538}
2539
2540static void addrconf_rs_timer(unsigned long data)
2541{
2542 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2543
2544 if (ifp->idev->cnf.forwarding)
2545 goto out;
2546
2547 if (ifp->idev->if_flags & IF_RA_RCVD) {
2548 /*
2549 * Announcement received after solicitation
2550 * was sent
2551 */
2552 goto out;
2553 }
2554
2555 spin_lock(&ifp->lock);
2556 if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2557 struct in6_addr all_routers;
2558
2559 /* The wait after the last probe can be shorter */
2560 addrconf_mod_timer(ifp, AC_RS,
2561 (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2562 ifp->idev->cnf.rtr_solicit_delay :
2563 ifp->idev->cnf.rtr_solicit_interval);
2564 spin_unlock(&ifp->lock);
2565
2566 ipv6_addr_all_routers(&all_routers);
2567
2568 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2569 } else {
2570 spin_unlock(&ifp->lock);
2571 /*
2572 * Note: we do not support deprecated "all on-link"
2573 * assumption any longer.
2574 */
2575 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2576 ifp->idev->dev->name);
2577 }
2578
2579out:
2580 in6_ifa_put(ifp);
2581}
2582
2583/*
2584 * Duplicate Address Detection
2585 */
3c21edbd
YH		 2586static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2587{
2588 unsigned long rand_num;
2589 struct inet6_dev *idev = ifp->idev;
2590
95c385b4
NH		 2591 if (ifp->flags & IFA_F_OPTIMISTIC)
2592 rand_num = 0;
2593 else
2594 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2595
3c21edbd
YH		 2596 ifp->probes = idev->cnf.dad_transmits;
2597 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2598}
2599
e431b8c0 2600static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
1da177e4
LT		 2601{
2602 struct inet6_dev *idev = ifp->idev;
2603 struct net_device *dev = idev->dev;
1da177e4
LT		 2604
2605 addrconf_join_solict(dev, &ifp->addr);
2606
1da177e4 2607 net_srandom(ifp->addr.s6_addr32[3]);
1da177e4
LT		 2608
2609 read_lock_bh(&idev->lock);
2610 if (ifp->dead)
2611 goto out;
2612 spin_lock_bh(&ifp->lock);
2613
2614 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
55ebaef1
NT		 2615 !(ifp->flags&IFA_F_TENTATIVE) ||
2616 ifp->flags & IFA_F_NODAD) {
95c385b4 2617 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
1da177e4
LT		 2618 spin_unlock_bh(&ifp->lock);
2619 read_unlock_bh(&idev->lock);
2620
2621 addrconf_dad_completed(ifp);
2622 return;
2623 }
2624
6732bade 2625 if (!(idev->if_flags & IF_READY)) {
3dd3bf83 2626 spin_unlock_bh(&ifp->lock);
6732bade 2627 read_unlock_bh(&idev->lock);
3c21edbd
YH		 2628 /*
2629 * If the defice is not ready:
2630 * - keep it tentative if it is a permanent address.
2631 * - otherwise, kill it.
2632 */
2633 in6_ifa_hold(ifp);
2634 addrconf_dad_stop(ifp);
6732bade 2635 return;
3c21edbd 2636 }
95c385b4
NH		 2637
2638 /*
2639 * Optimistic nodes can start receiving
2640 * Frames right away
2641 */
2642 if(ifp->flags & IFA_F_OPTIMISTIC)
2643 ip6_ins_rt(ifp->rt);
2644
6732bade
YH		 2645 addrconf_dad_kick(ifp);
2646 spin_unlock_bh(&ifp->lock);
1da177e4
LT		 2647out:
2648 read_unlock_bh(&idev->lock);
2649}
2650
2651static void addrconf_dad_timer(unsigned long data)
2652{
2653 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2654 struct inet6_dev *idev = ifp->idev;
2655 struct in6_addr unspec;
2656 struct in6_addr mcaddr;
2657
2658 read_lock_bh(&idev->lock);
2659 if (idev->dead) {
2660 read_unlock_bh(&idev->lock);
2661 goto out;
2662 }
2663 spin_lock_bh(&ifp->lock);
2664 if (ifp->probes == 0) {
2665 /*
2666 * DAD was successful
2667 */
2668
95c385b4 2669 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
1da177e4
LT		 2670 spin_unlock_bh(&ifp->lock);
2671 read_unlock_bh(&idev->lock);
2672
2673 addrconf_dad_completed(ifp);
2674
2675 goto out;
2676 }
2677
2678 ifp->probes--;
2679 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2680 spin_unlock_bh(&ifp->lock);
2681 read_unlock_bh(&idev->lock);
2682
2683 /* send a neighbour solicitation for our addr */
2684 memset(&unspec, 0, sizeof(unspec));
2685 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2686 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec);
2687out:
2688 in6_ifa_put(ifp);
2689}
2690
2691static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2692{
2693 struct net_device * dev = ifp->idev->dev;
2694
2695 /*
2696 * Configure the address for reception. Now it is valid.
2697 */
2698
2699 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2700
2701 /* If added prefix is link local and forwarding is off,
2702 start sending router solicitations.
2703 */
2704
2705 if (ifp->idev->cnf.forwarding == 0 &&
2706 ifp->idev->cnf.rtr_solicits > 0 &&
2707 (dev->flags&IFF_LOOPBACK) == 0 &&
2708 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2709 struct in6_addr all_routers;
2710
2711 ipv6_addr_all_routers(&all_routers);
2712
2713 /*
2714 * If a host as already performed a random delay
2715 * [...] as part of DAD [...] there is no need
2716 * to delay again before sending the first RS
2717 */
2718 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2719
2720 spin_lock_bh(&ifp->lock);
2721 ifp->probes = 1;
2722 ifp->idev->if_flags |= IF_RS_SENT;
2723 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2724 spin_unlock_bh(&ifp->lock);
2725 }
2726}
2727
c5e33bdd
YH		 2728static void addrconf_dad_run(struct inet6_dev *idev) {
2729 struct inet6_ifaddr *ifp;
2730
2731 read_lock_bh(&idev->lock);
2732 for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2733 spin_lock_bh(&ifp->lock);
2734 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2735 spin_unlock_bh(&ifp->lock);
2736 continue;
2737 }
2738 spin_unlock_bh(&ifp->lock);
2739 addrconf_dad_kick(ifp);
2740 }
2741 read_unlock_bh(&idev->lock);
2742}
2743
1da177e4
LT		 2744#ifdef CONFIG_PROC_FS
2745struct if6_iter_state {
2746 int bucket;
2747};
2748
2749static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2750{
2751 struct inet6_ifaddr *ifa = NULL;
2752 struct if6_iter_state *state = seq->private;
2753
2754 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2755 ifa = inet6_addr_lst[state->bucket];
2756 if (ifa)
2757 break;
2758 }
2759 return ifa;
2760}
2761
2762static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2763{
2764 struct if6_iter_state *state = seq->private;
2765
2766 ifa = ifa->lst_next;
2767try_again:
2768 if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2769 ifa = inet6_addr_lst[state->bucket];
2770 goto try_again;
2771 }
2772 return ifa;
2773}
2774
2775static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2776{
2777 struct inet6_ifaddr *ifa = if6_get_first(seq);
2778
2779 if (ifa)
2780 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2781 --pos;
2782 return pos ? NULL : ifa;
2783}
2784
2785static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2786{
2787 read_lock_bh(&addrconf_hash_lock);
2788 return if6_get_idx(seq, *pos);
2789}
2790
2791static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2792{
2793 struct inet6_ifaddr *ifa;
2794
2795 ifa = if6_get_next(seq, v);
2796 ++*pos;
2797 return ifa;
2798}
2799
2800static void if6_seq_stop(struct seq_file *seq, void *v)
2801{
2802 read_unlock_bh(&addrconf_hash_lock);
2803}
2804
2805static int if6_seq_show(struct seq_file *seq, void *v)
2806{
2807 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2808 seq_printf(seq,
9343e79a 2809 NIP6_SEQFMT " %02x %02x %02x %02x %8s\n",
1da177e4
LT		 2810 NIP6(ifp->addr),
2811 ifp->idev->dev->ifindex,
2812 ifp->prefix_len,
2813 ifp->scope,
2814 ifp->flags,
2815 ifp->idev->dev->name);
2816 return 0;
2817}
2818
56b3d975 2819static const struct seq_operations if6_seq_ops = {
1da177e4
LT		 2820 .start = if6_seq_start,
2821 .next = if6_seq_next,
2822 .show = if6_seq_show,
2823 .stop = if6_seq_stop,
2824};
2825
2826static int if6_seq_open(struct inode *inode, struct file *file)
2827{
cf7732e4
PE		 2828 return seq_open_private(file, &if6_seq_ops,
2829 sizeof(struct if6_iter_state));
1da177e4
LT		 2830}
2831
9a32144e 2832static const struct file_operations if6_fops = {
1da177e4
LT		 2833 .owner = THIS_MODULE,
2834 .open = if6_seq_open,
2835 .read = seq_read,
2836 .llseek = seq_lseek,
2837 .release = seq_release_private,
2838};
2839
2840int __init if6_proc_init(void)
2841{
457c4cbc 2842 if (!proc_net_fops_create(&init_net, "if_inet6", S_IRUGO, &if6_fops))
1da177e4
LT		 2843 return -ENOMEM;
2844 return 0;
2845}
2846
2847void if6_proc_exit(void)
2848{
457c4cbc 2849 proc_net_remove(&init_net, "if_inet6");
1da177e4
LT		 2850}
2851#endif /* CONFIG_PROC_FS */
2852
59fbb3a6 2853#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3b9f9a1c
NT		 2854/* Check if address is a home address configured on any interface. */
2855int ipv6_chk_home_addr(struct in6_addr *addr)
2856{
2857 int ret = 0;
2858 struct inet6_ifaddr * ifp;
2859 u8 hash = ipv6_addr_hash(addr);
2860 read_lock_bh(&addrconf_hash_lock);
2861 for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) {
2862 if (ipv6_addr_cmp(&ifp->addr, addr) == 0 &&
2863 (ifp->flags & IFA_F_HOMEADDRESS)) {
2864 ret = 1;
2865 break;
2866 }
2867 }
2868 read_unlock_bh(&addrconf_hash_lock);
2869 return ret;
2870}
2871#endif
2872
1da177e4
LT		 2873/*
2874 * Periodic address status verification
2875 */
2876
2877static void addrconf_verify(unsigned long foo)
2878{
2879 struct inet6_ifaddr *ifp;
2880 unsigned long now, next;
2881 int i;
2882
2883 spin_lock_bh(&addrconf_verify_lock);
2884 now = jiffies;
2885 next = now + ADDR_CHECK_FREQUENCY;
2886
2887 del_timer(&addr_chk_timer);
2888
2889 for (i=0; i < IN6_ADDR_HSIZE; i++) {
2890
2891restart:
5d5780df 2892 read_lock(&addrconf_hash_lock);
1da177e4
LT		 2893 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
2894 unsigned long age;
2895#ifdef CONFIG_IPV6_PRIVACY
2896 unsigned long regen_advance;
2897#endif
2898
2899 if (ifp->flags & IFA_F_PERMANENT)
2900 continue;
2901
2902 spin_lock(&ifp->lock);
2903 age = (now - ifp->tstamp) / HZ;
2904
2905#ifdef CONFIG_IPV6_PRIVACY
1ab1457c
YH		 2906 regen_advance = ifp->idev->cnf.regen_max_retry *
2907 ifp->idev->cnf.dad_transmits *
1da177e4
LT		 2908 ifp->idev->nd_parms->retrans_time / HZ;
2909#endif
2910
8f27ebb9
YH		 2911 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
2912 age >= ifp->valid_lft) {
1da177e4
LT		 2913 spin_unlock(&ifp->lock);
2914 in6_ifa_hold(ifp);
5d5780df 2915 read_unlock(&addrconf_hash_lock);
1da177e4
LT		 2916 ipv6_del_addr(ifp);
2917 goto restart;
8f27ebb9
YH		 2918 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
2919 spin_unlock(&ifp->lock);
2920 continue;
1da177e4
LT		 2921 } else if (age >= ifp->prefered_lft) {
2922 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
2923 int deprecate = 0;
2924
2925 if (!(ifp->flags&IFA_F_DEPRECATED)) {
2926 deprecate = 1;
2927 ifp->flags |= IFA_F_DEPRECATED;
2928 }
2929
2930 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
2931 next = ifp->tstamp + ifp->valid_lft * HZ;
2932
2933 spin_unlock(&ifp->lock);
2934
2935 if (deprecate) {
2936 in6_ifa_hold(ifp);
5d5780df 2937 read_unlock(&addrconf_hash_lock);
1da177e4
LT		 2938
2939 ipv6_ifa_notify(0, ifp);
2940 in6_ifa_put(ifp);
2941 goto restart;
2942 }
2943#ifdef CONFIG_IPV6_PRIVACY
2944 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
2945 !(ifp->flags&IFA_F_TENTATIVE)) {
2946 if (age >= ifp->prefered_lft - regen_advance) {
2947 struct inet6_ifaddr *ifpub = ifp->ifpub;
2948 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2949 next = ifp->tstamp + ifp->prefered_lft * HZ;
2950 if (!ifp->regen_count && ifpub) {
2951 ifp->regen_count++;
2952 in6_ifa_hold(ifp);
2953 in6_ifa_hold(ifpub);
2954 spin_unlock(&ifp->lock);
5d5780df 2955 read_unlock(&addrconf_hash_lock);
291d809b
HY		 2956 spin_lock(&ifpub->lock);
2957 ifpub->regen_count = 0;
2958 spin_unlock(&ifpub->lock);
1da177e4
LT		 2959 ipv6_create_tempaddr(ifpub, ifp);
2960 in6_ifa_put(ifpub);
2961 in6_ifa_put(ifp);
2962 goto restart;
2963 }
2964 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
2965 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
2966 spin_unlock(&ifp->lock);
2967#endif
2968 } else {
2969 /* ifp->prefered_lft <= ifp->valid_lft */
2970 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2971 next = ifp->tstamp + ifp->prefered_lft * HZ;
2972 spin_unlock(&ifp->lock);
2973 }
2974 }
5d5780df 2975 read_unlock(&addrconf_hash_lock);
1da177e4
LT		 2976 }
2977
2978 addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
2979 add_timer(&addr_chk_timer);
2980 spin_unlock_bh(&addrconf_verify_lock);
2981}
2982
461d8837
TG		 2983static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
2984{
2985 struct in6_addr *pfx = NULL;
2986
2987 if (addr)
2988 pfx = nla_data(addr);
2989
2990 if (local) {
2991 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
2992 pfx = NULL;
2993 else
2994 pfx = nla_data(local);
2995 }
2996
2997 return pfx;
2998}
2999
ef7c79ed 3000static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
461d8837
TG		 3001 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3002 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3003 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3004};
3005
1da177e4
LT		 3006static int
3007inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3008{
b854272b 3009 struct net *net = skb->sk->sk_net;
b933f716
TG		 3010 struct ifaddrmsg *ifm;
3011 struct nlattr *tb[IFA_MAX+1];
1da177e4 3012 struct in6_addr *pfx;
b933f716 3013 int err;
1da177e4 3014
b854272b
DL		 3015 if (net != &init_net)
3016 return -EINVAL;
3017
b933f716
TG		 3018 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3019 if (err < 0)
3020 return err;
3021
3022 ifm = nlmsg_data(nlh);
3023 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
1da177e4
LT		 3024 if (pfx == NULL)
3025 return -EINVAL;
3026
3027 return inet6_addr_del(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3028}
3029
55ebaef1
NT		 3030static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3031 u32 prefered_lft, u32 valid_lft)
081bba5b 3032{
46d48046
YH		 3033 u32 flags = RTF_EXPIRES;
3034
081bba5b
NT		 3035 if (!valid_lft || (prefered_lft > valid_lft))
3036 return -EINVAL;
3037
46d48046 3038 if (valid_lft == INFINITY_LIFE_TIME) {
55ebaef1 3039 ifa_flags |= IFA_F_PERMANENT;
46d48046
YH		 3040 flags = 0;
3041 } else if (valid_lft >= 0x7FFFFFFF/HZ)
081bba5b
NT		 3042 valid_lft = 0x7FFFFFFF/HZ;
3043
3044 if (prefered_lft == 0)
55ebaef1 3045 ifa_flags |= IFA_F_DEPRECATED;
081bba5b
NT		 3046 else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
3047 (prefered_lft != INFINITY_LIFE_TIME))
3048 prefered_lft = 0x7FFFFFFF/HZ;
3049
3050 spin_lock_bh(&ifp->lock);
3b9f9a1c 3051 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
081bba5b
NT		 3052 ifp->tstamp = jiffies;
3053 ifp->valid_lft = valid_lft;
3054 ifp->prefered_lft = prefered_lft;
3055
3056 spin_unlock_bh(&ifp->lock);
3057 if (!(ifp->flags&IFA_F_TENTATIVE))
3058 ipv6_ifa_notify(0, ifp);
081bba5b 3059
46d48046
YH		 3060 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3061 jiffies_to_clock_t(valid_lft * HZ), flags);
081bba5b
NT		 3062 addrconf_verify(0);
3063
3064 return 0;
3065}
3066
1da177e4
LT		 3067static int
3068inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3069{
b854272b 3070 struct net *net = skb->sk->sk_net;
461d8837
TG		 3071 struct ifaddrmsg *ifm;
3072 struct nlattr *tb[IFA_MAX+1];
1da177e4 3073 struct in6_addr *pfx;
7198f8ce
TG		 3074 struct inet6_ifaddr *ifa;
3075 struct net_device *dev;
55ebaef1
NT		 3076 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3077 u8 ifa_flags;
461d8837 3078 int err;
1da177e4 3079
b854272b
DL		 3080 if (net != &init_net)
3081 return -EINVAL;
3082
461d8837
TG		 3083 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3084 if (err < 0)
3085 return err;
3086
3087 ifm = nlmsg_data(nlh);
3088 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
1da177e4
LT		 3089 if (pfx == NULL)
3090 return -EINVAL;
3091
461d8837 3092 if (tb[IFA_CACHEINFO]) {
0778769d 3093 struct ifa_cacheinfo *ci;
461d8837
TG		 3094
3095 ci = nla_data(tb[IFA_CACHEINFO]);
0778769d 3096 valid_lft = ci->ifa_valid;
461d8837
TG		 3097 preferred_lft = ci->ifa_prefered;
3098 } else {
3099 preferred_lft = INFINITY_LIFE_TIME;
3100 valid_lft = INFINITY_LIFE_TIME;
0778769d
NT		 3101 }
3102
881d966b 3103 dev = __dev_get_by_index(&init_net, ifm->ifa_index);
7198f8ce
TG		 3104 if (dev == NULL)
3105 return -ENODEV;
3106
55ebaef1 3107 /* We ignore other flags so far. */
3b9f9a1c 3108 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
55ebaef1 3109
7198f8ce
TG		 3110 ifa = ipv6_get_ifaddr(pfx, dev, 1);
3111 if (ifa == NULL) {
3112 /*
3113 * It would be best to check for !NLM_F_CREATE here but
3114 * userspace alreay relies on not having to provide this.
3115 */
3116 return inet6_addr_add(ifm->ifa_index, pfx, ifm->ifa_prefixlen,
55ebaef1 3117 ifa_flags, preferred_lft, valid_lft);
081bba5b
NT		 3118 }
3119
7198f8ce
TG		 3120 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3121 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3122 err = -EEXIST;
3123 else
55ebaef1 3124 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
7198f8ce
TG		 3125
3126 in6_ifa_put(ifa);
3127
3128 return err;
1da177e4
LT		 3129}
3130
101bb229
TG		 3131static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3132 u8 scope, int ifindex)
3133{
3134 struct ifaddrmsg *ifm;
3135
3136 ifm = nlmsg_data(nlh);
3137 ifm->ifa_family = AF_INET6;
3138 ifm->ifa_prefixlen = prefixlen;
3139 ifm->ifa_flags = flags;
3140 ifm->ifa_scope = scope;
3141 ifm->ifa_index = ifindex;
3142}
3143
85486af0
TG		 3144static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3145 unsigned long tstamp, u32 preferred, u32 valid)
3146{
3147 struct ifa_cacheinfo ci;
3148
3149 ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3150 + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3151 ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3152 + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3153 ci.ifa_prefered = preferred;
3154 ci.ifa_valid = valid;
3155
3156 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3157}
3158
101bb229
TG		 3159static inline int rt_scope(int ifa_scope)
3160{
3161 if (ifa_scope & IFA_HOST)
3162 return RT_SCOPE_HOST;
3163 else if (ifa_scope & IFA_LINK)
3164 return RT_SCOPE_LINK;
3165 else if (ifa_scope & IFA_SITE)
3166 return RT_SCOPE_SITE;
3167 else
3168 return RT_SCOPE_UNIVERSE;
3169}
3170
0ab6803b
TG		 3171static inline int inet6_ifaddr_msgsize(void)
3172{
339bf98f
TG		 3173 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3174 + nla_total_size(16) /* IFA_ADDRESS */
3175 + nla_total_size(sizeof(struct ifa_cacheinfo));
0ab6803b 3176}
c5396a31 3177
1da177e4 3178static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
b6544c0b 3179 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3180{
1da177e4 3181 struct nlmsghdr *nlh;
85486af0 3182 u32 preferred, valid;
1da177e4 3183
0ab6803b
TG		 3184 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3185 if (nlh == NULL)
26932566 3186 return -EMSGSIZE;
0ab6803b 3187
101bb229
TG		 3188 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3189 ifa->idev->dev->ifindex);
3190
1da177e4 3191 if (!(ifa->flags&IFA_F_PERMANENT)) {
85486af0
TG		 3192 preferred = ifa->prefered_lft;
3193 valid = ifa->valid_lft;
3194 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 3195 long tval = (jiffies - ifa->tstamp)/HZ;
85486af0
TG		 3196 preferred -= tval;
3197 if (valid != INFINITY_LIFE_TIME)
3198 valid -= tval;
1da177e4
LT		 3199 }
3200 } else {
85486af0
TG		 3201 preferred = INFINITY_LIFE_TIME;
3202 valid = INFINITY_LIFE_TIME;
3203 }
3204
0ab6803b 3205 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
26932566
PM		 3206 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3207 nlmsg_cancel(skb, nlh);
3208 return -EMSGSIZE;
3209 }
1da177e4 3210
0ab6803b 3211 return nlmsg_end(skb, nlh);
1da177e4
LT		 3212}
3213
3214static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
e431b8c0 3215 u32 pid, u32 seq, int event, u16 flags)
1da177e4 3216{
1da177e4 3217 struct nlmsghdr *nlh;
101bb229
TG		 3218 u8 scope = RT_SCOPE_UNIVERSE;
3219 int ifindex = ifmca->idev->dev->ifindex;
3220
3221 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3222 scope = RT_SCOPE_SITE;
1da177e4 3223
0ab6803b
TG		 3224 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3225 if (nlh == NULL)
26932566 3226 return -EMSGSIZE;
85486af0 3227
0ab6803b
TG		 3228 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3229 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3230 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 3231 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3232 nlmsg_cancel(skb, nlh);
3233 return -EMSGSIZE;
3234 }
85486af0 3235
0ab6803b 3236 return nlmsg_end(skb, nlh);
1da177e4
LT		 3237}
3238
3239static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
b6544c0b 3240 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3241{
1da177e4 3242 struct nlmsghdr *nlh;
101bb229
TG		 3243 u8 scope = RT_SCOPE_UNIVERSE;
3244 int ifindex = ifaca->aca_idev->dev->ifindex;
3245
3246 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3247 scope = RT_SCOPE_SITE;
1da177e4 3248
0ab6803b
TG		 3249 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3250 if (nlh == NULL)
26932566 3251 return -EMSGSIZE;
85486af0 3252
0ab6803b
TG		 3253 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3254 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3255 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 3256 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3257 nlmsg_cancel(skb, nlh);
3258 return -EMSGSIZE;
3259 }
1da177e4 3260
0ab6803b 3261 return nlmsg_end(skb, nlh);
1da177e4
LT		 3262}
3263
3264enum addr_type_t
3265{
3266 UNICAST_ADDR,
3267 MULTICAST_ADDR,
3268 ANYCAST_ADDR,
3269};
3270
3271static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3272 enum addr_type_t type)
3273{
3274 int idx, ip_idx;
3275 int s_idx, s_ip_idx;
3276 int err = 1;
3277 struct net_device *dev;
3278 struct inet6_dev *idev = NULL;
3279 struct inet6_ifaddr *ifa;
3280 struct ifmcaddr6 *ifmca;
3281 struct ifacaddr6 *ifaca;
3282
3283 s_idx = cb->args[0];
3284 s_ip_idx = ip_idx = cb->args[1];
1ab1457c 3285
7562f876 3286 idx = 0;
881d966b 3287 for_each_netdev(&init_net, dev) {
1da177e4 3288 if (idx < s_idx)
7562f876 3289 goto cont;
1da177e4
LT		 3290 if (idx > s_idx)
3291 s_ip_idx = 0;
3292 ip_idx = 0;
3293 if ((idev = in6_dev_get(dev)) == NULL)
7562f876 3294 goto cont;
1da177e4
LT		 3295 read_lock_bh(&idev->lock);
3296 switch (type) {
3297 case UNICAST_ADDR:
ae9cda5d 3298 /* unicast address incl. temp addr */
1da177e4
LT		 3299 for (ifa = idev->addr_list; ifa;
3300 ifa = ifa->if_next, ip_idx++) {
3301 if (ip_idx < s_ip_idx)
3302 continue;
1ab1457c
YH		 3303 if ((err = inet6_fill_ifaddr(skb, ifa,
3304 NETLINK_CB(cb->skb).pid,
b6544c0b
JHS		 3305 cb->nlh->nlmsg_seq, RTM_NEWADDR,
3306 NLM_F_MULTI)) <= 0)
1da177e4
LT		 3307 goto done;
3308 }
1da177e4
LT		 3309 break;
3310 case MULTICAST_ADDR:
3311 /* multicast address */
1ab1457c 3312 for (ifmca = idev->mc_list; ifmca;
1da177e4
LT		 3313 ifmca = ifmca->next, ip_idx++) {
3314 if (ip_idx < s_ip_idx)
3315 continue;
1ab1457c
YH		 3316 if ((err = inet6_fill_ifmcaddr(skb, ifmca,
3317 NETLINK_CB(cb->skb).pid,
b6544c0b
JHS		 3318 cb->nlh->nlmsg_seq, RTM_GETMULTICAST,
3319 NLM_F_MULTI)) <= 0)
1da177e4
LT		 3320 goto done;
3321 }
3322 break;
3323 case ANYCAST_ADDR:
3324 /* anycast address */
3325 for (ifaca = idev->ac_list; ifaca;
3326 ifaca = ifaca->aca_next, ip_idx++) {
3327 if (ip_idx < s_ip_idx)
3328 continue;
1ab1457c
YH		 3329 if ((err = inet6_fill_ifacaddr(skb, ifaca,
3330 NETLINK_CB(cb->skb).pid,
b6544c0b 3331 cb->nlh->nlmsg_seq, RTM_GETANYCAST,
1ab1457c 3332 NLM_F_MULTI)) <= 0)
1da177e4
LT		 3333 goto done;
3334 }
3335 break;
3336 default:
3337 break;
3338 }
3339 read_unlock_bh(&idev->lock);
3340 in6_dev_put(idev);
7562f876
PE		 3341cont:
3342 idx++;
1da177e4
LT		 3343 }
3344done:
3345 if (err <= 0) {
3346 read_unlock_bh(&idev->lock);
3347 in6_dev_put(idev);
3348 }
1da177e4
LT		 3349 cb->args[0] = idx;
3350 cb->args[1] = ip_idx;
3351 return skb->len;
3352}
3353
3354static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3355{
b854272b 3356 struct net *net = skb->sk->sk_net;
1da177e4 3357 enum addr_type_t type = UNICAST_ADDR;
b854272b
DL		 3358
3359 if (net != &init_net)
3360 return 0;
3361
1da177e4
LT		 3362 return inet6_dump_addr(skb, cb, type);
3363}
3364
3365static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3366{
b854272b 3367 struct net *net = skb->sk->sk_net;
1da177e4 3368 enum addr_type_t type = MULTICAST_ADDR;
b854272b
DL		 3369
3370 if (net != &init_net)
3371 return 0;
3372
1da177e4
LT		 3373 return inet6_dump_addr(skb, cb, type);
3374}
3375
3376
3377static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3378{
b854272b 3379 struct net *net = skb->sk->sk_net;
1da177e4 3380 enum addr_type_t type = ANYCAST_ADDR;
b854272b
DL		 3381
3382 if (net != &init_net)
3383 return 0;
3384
1da177e4
LT		 3385 return inet6_dump_addr(skb, cb, type);
3386}
3387
1b29fc2c
TG		 3388static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3389 void *arg)
6c223828 3390{
b854272b 3391 struct net *net = in_skb->sk->sk_net;
1b29fc2c
TG		 3392 struct ifaddrmsg *ifm;
3393 struct nlattr *tb[IFA_MAX+1];
6c223828
NT		 3394 struct in6_addr *addr = NULL;
3395 struct net_device *dev = NULL;
3396 struct inet6_ifaddr *ifa;
3397 struct sk_buff *skb;
6c223828
NT		 3398 int err;
3399
b854272b
DL		 3400 if (net != &init_net)
3401 return -EINVAL;
3402
1b29fc2c
TG		 3403 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3404 if (err < 0)
3405 goto errout;
3406
3407 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3408 if (addr == NULL) {
3409 err = -EINVAL;
3410 goto errout;
6c223828 3411 }
6c223828 3412
1b29fc2c 3413 ifm = nlmsg_data(nlh);
6c223828 3414 if (ifm->ifa_index)
881d966b 3415 dev = __dev_get_by_index(&init_net, ifm->ifa_index);
6c223828 3416
1b29fc2c
TG		 3417 if ((ifa = ipv6_get_ifaddr(addr, dev, 1)) == NULL) {
3418 err = -EADDRNOTAVAIL;
3419 goto errout;
3420 }
6c223828 3421
0ab6803b 3422 if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) {
6c223828 3423 err = -ENOBUFS;
1b29fc2c 3424 goto errout_ifa;
6c223828
NT		 3425 }
3426
6c223828
NT		 3427 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3428 nlh->nlmsg_seq, RTM_NEWADDR, 0);
26932566
PM		 3429 if (err < 0) {
3430 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3431 WARN_ON(err == -EMSGSIZE);
3432 kfree_skb(skb);
3433 goto errout_ifa;
3434 }
97c53cac 3435 err = rtnl_unicast(skb, &init_net, NETLINK_CB(in_skb).pid);
1b29fc2c 3436errout_ifa:
6c223828 3437 in6_ifa_put(ifa);
1b29fc2c 3438errout:
6c223828 3439 return err;
6c223828
NT		 3440}
3441
1da177e4
LT		 3442static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3443{
3444 struct sk_buff *skb;
5d620266 3445 int err = -ENOBUFS;
1da177e4 3446
0ab6803b 3447 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5d620266
TG		 3448 if (skb == NULL)
3449 goto errout;
3450
3451 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
26932566
PM		 3452 if (err < 0) {
3453 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3454 WARN_ON(err == -EMSGSIZE);
3455 kfree_skb(skb);
3456 goto errout;
3457 }
97c53cac 3458 err = rtnl_notify(skb, &init_net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
5d620266
TG		 3459errout:
3460 if (err < 0)
97c53cac 3461 rtnl_set_sk_err(&init_net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 3462}
3463
b6f99a21 3464static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
1da177e4
LT		 3465 __s32 *array, int bytes)
3466{
04561c1f
TG		 3467 BUG_ON(bytes < (DEVCONF_MAX * 4));
3468
1da177e4
LT		 3469 memset(array, 0, bytes);
3470 array[DEVCONF_FORWARDING] = cnf->forwarding;
3471 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3472 array[DEVCONF_MTU6] = cnf->mtu6;
3473 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3474 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3475 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3476 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3477 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3478 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3479 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3480 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3481#ifdef CONFIG_IPV6_PRIVACY
3482 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3483 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3484 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3485 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3486 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3487#endif
3488 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 3489 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
c4fd30eb 3490 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 3491#ifdef CONFIG_IPV6_ROUTER_PREF
3492 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
52e16356 3493 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
fa03ef38 3494#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 3495 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3496#endif
930d6ff2 3497#endif
fbea49e1 3498 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
0bcbc926 3499 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
95c385b4
NH		 3500#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3501 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3502#endif
1da177e4
LT		 3503}
3504
339bf98f
TG		 3505static inline size_t inet6_if_nlmsg_size(void)
3506{
3507 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3508 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3509 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3510 + nla_total_size(4) /* IFLA_MTU */
3511 + nla_total_size(4) /* IFLA_LINK */
3512 + nla_total_size( /* IFLA_PROTINFO */
3513 nla_total_size(4) /* IFLA_INET6_FLAGS */
3514 + nla_total_size(sizeof(struct ifla_cacheinfo))
3515 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
bf99f1bd
YH		 3516 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3517 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
339bf98f
TG		 3518 );
3519}
c5396a31 3520
7f7d9a6b
HX		 3521static inline void __snmp6_fill_stats(u64 *stats, void **mib, int items,
3522 int bytes)
3523{
3524 int i;
3525 int pad = bytes - sizeof(u64) * items;
3526 BUG_ON(pad < 0);
3527
3528 /* Use put_unaligned() because stats may not be aligned for u64. */
3529 put_unaligned(items, &stats[0]);
3530 for (i = 1; i < items; i++)
3531 put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3532
3533 memset(&stats[items], 0, pad);
3534}
3535
3536static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3537 int bytes)
3538{
3539 switch(attrtype) {
3540 case IFLA_INET6_STATS:
3541 __snmp6_fill_stats(stats, (void **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes);
3542 break;
3543 case IFLA_INET6_ICMP6STATS:
3544 __snmp6_fill_stats(stats, (void **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
3545 break;
3546 }
3547}
3548
1ab1457c 3549static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
b6544c0b 3550 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3551{
04561c1f 3552 struct net_device *dev = idev->dev;
bf99f1bd 3553 struct nlattr *nla;
04561c1f
TG		 3554 struct ifinfomsg *hdr;
3555 struct nlmsghdr *nlh;
3556 void *protoinfo;
3557 struct ifla_cacheinfo ci;
3558
3559 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3560 if (nlh == NULL)
26932566 3561 return -EMSGSIZE;
04561c1f
TG		 3562
3563 hdr = nlmsg_data(nlh);
3564 hdr->ifi_family = AF_INET6;
3565 hdr->__ifi_pad = 0;
3566 hdr->ifi_type = dev->type;
3567 hdr->ifi_index = dev->ifindex;
3568 hdr->ifi_flags = dev_get_flags(dev);
3569 hdr->ifi_change = 0;
3570
3571 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
1da177e4
LT		 3572
3573 if (dev->addr_len)
04561c1f 3574 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
1da177e4 3575
04561c1f 3576 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
1da177e4 3577 if (dev->ifindex != dev->iflink)
04561c1f 3578 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
1da177e4 3579
04561c1f
TG		 3580 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3581 if (protoinfo == NULL)
3582 goto nla_put_failure;
1da177e4 3583
04561c1f 3584 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
1da177e4 3585
1da177e4
LT		 3586 ci.max_reasm_len = IPV6_MAXPLEN;
3587 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3588 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3589 ci.reachable_time = idev->nd_parms->reachable_time;
3590 ci.retrans_time = idev->nd_parms->retrans_time;
04561c1f
TG		 3591 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3592
bf99f1bd
YH		 3593 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3594 if (nla == NULL)
04561c1f 3595 goto nla_put_failure;
bf99f1bd 3596 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
1da177e4 3597
bf99f1bd
YH		 3598 /* XXX - MC not implemented */
3599
3600 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3601 if (nla == NULL)
3602 goto nla_put_failure;
3603 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3604
3605 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3606 if (nla == NULL)
3607 goto nla_put_failure;
3608 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
1da177e4 3609
04561c1f
TG		 3610 nla_nest_end(skb, protoinfo);
3611 return nlmsg_end(skb, nlh);
1da177e4 3612
04561c1f 3613nla_put_failure:
26932566
PM		 3614 nlmsg_cancel(skb, nlh);
3615 return -EMSGSIZE;
1da177e4
LT		 3616}
3617
3618static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3619{
b854272b 3620 struct net *net = skb->sk->sk_net;
1da177e4
LT		 3621 int idx, err;
3622 int s_idx = cb->args[0];
3623 struct net_device *dev;
3624 struct inet6_dev *idev;
3625
b854272b
DL		 3626 if (net != &init_net)
3627 return 0;
3628
1da177e4 3629 read_lock(&dev_base_lock);
7562f876 3630 idx = 0;
881d966b 3631 for_each_netdev(&init_net, dev) {
1da177e4 3632 if (idx < s_idx)
7562f876 3633 goto cont;
1da177e4 3634 if ((idev = in6_dev_get(dev)) == NULL)
7562f876 3635 goto cont;
1ab1457c 3636 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
b6544c0b 3637 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
1da177e4
LT		 3638 in6_dev_put(idev);
3639 if (err <= 0)
3640 break;
7562f876
PE		 3641cont:
3642 idx++;
1da177e4
LT		 3643 }
3644 read_unlock(&dev_base_lock);
3645 cb->args[0] = idx;
3646
3647 return skb->len;
3648}
3649
3650void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3651{
3652 struct sk_buff *skb;
8d7a76c9 3653 int err = -ENOBUFS;
1ab1457c 3654
339bf98f 3655 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
8d7a76c9
TG		 3656 if (skb == NULL)
3657 goto errout;
3658
3659 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 3660 if (err < 0) {
3661 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3662 WARN_ON(err == -EMSGSIZE);
3663 kfree_skb(skb);
3664 goto errout;
3665 }
97c53cac 3666 err = rtnl_notify(skb, &init_net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
8d7a76c9
TG		 3667errout:
3668 if (err < 0)
97c53cac 3669 rtnl_set_sk_err(&init_net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 3670}
3671
339bf98f
TG		 3672static inline size_t inet6_prefix_nlmsg_size(void)
3673{
3674 return NLMSG_ALIGN(sizeof(struct prefixmsg))
3675 + nla_total_size(sizeof(struct in6_addr))
3676 + nla_total_size(sizeof(struct prefix_cacheinfo));
3677}
c5396a31 3678
1da177e4 3679static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
6051e2f4
TG		 3680 struct prefix_info *pinfo, u32 pid, u32 seq,
3681 int event, unsigned int flags)
1da177e4 3682{
6051e2f4
TG		 3683 struct prefixmsg *pmsg;
3684 struct nlmsghdr *nlh;
1da177e4
LT		 3685 struct prefix_cacheinfo ci;
3686
6051e2f4
TG		 3687 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
3688 if (nlh == NULL)
26932566 3689 return -EMSGSIZE;
6051e2f4
TG		 3690
3691 pmsg = nlmsg_data(nlh);
1da177e4 3692 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 3693 pmsg->prefix_pad1 = 0;
3694 pmsg->prefix_pad2 = 0;
1da177e4
LT		 3695 pmsg->prefix_ifindex = idev->dev->ifindex;
3696 pmsg->prefix_len = pinfo->prefix_len;
3697 pmsg->prefix_type = pinfo->type;
8a47077a 3698 pmsg->prefix_pad3 = 0;
1da177e4
LT		 3699 pmsg->prefix_flags = 0;
3700 if (pinfo->onlink)
3701 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3702 if (pinfo->autoconf)
3703 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3704
6051e2f4 3705 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
1da177e4
LT		 3706
3707 ci.preferred_time = ntohl(pinfo->prefered);
3708 ci.valid_time = ntohl(pinfo->valid);
6051e2f4 3709 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
1da177e4 3710
6051e2f4 3711 return nlmsg_end(skb, nlh);
1da177e4 3712
6051e2f4 3713nla_put_failure:
26932566
PM		 3714 nlmsg_cancel(skb, nlh);
3715 return -EMSGSIZE;
1da177e4
LT		 3716}
3717
1ab1457c 3718static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 3719 struct prefix_info *pinfo)
3720{
3721 struct sk_buff *skb;
8c384bfa 3722 int err = -ENOBUFS;
1da177e4 3723
339bf98f 3724 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
8c384bfa
TG		 3725 if (skb == NULL)
3726 goto errout;
3727
3728 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 3729 if (err < 0) {
3730 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
3731 WARN_ON(err == -EMSGSIZE);
3732 kfree_skb(skb);
3733 goto errout;
3734 }
97c53cac 3735 err = rtnl_notify(skb, &init_net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
8c384bfa
TG		 3736errout:
3737 if (err < 0)
97c53cac 3738 rtnl_set_sk_err(&init_net, RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 3739}
3740
1da177e4
LT		 3741static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3742{
3743 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3744
3745 switch (event) {
3746 case RTM_NEWADDR:
95c385b4
NH		 3747 /*
3748 * If the address was optimistic
3749 * we inserted the route at the start of
3750 * our DAD process, so we don't need
3751 * to do it again
3752 */
3753 if (!(ifp->rt->rt6i_node))
3754 ip6_ins_rt(ifp->rt);
1da177e4
LT		 3755 if (ifp->idev->cnf.forwarding)
3756 addrconf_join_anycast(ifp);
3757 break;
3758 case RTM_DELADDR:
3759 if (ifp->idev->cnf.forwarding)
3760 addrconf_leave_anycast(ifp);
3761 addrconf_leave_solict(ifp->idev, &ifp->addr);
3762 dst_hold(&ifp->rt->u.dst);
e0a1ad73 3763 if (ip6_del_rt(ifp->rt))
1da177e4 3764 dst_free(&ifp->rt->u.dst);
1da177e4
LT		 3765 break;
3766 }
3767}
3768
3769static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3770{
8814c4b5 3771 rcu_read_lock_bh();
1da177e4
LT		 3772 if (likely(ifp->idev->dead == 0))
3773 __ipv6_ifa_notify(event, ifp);
8814c4b5 3774 rcu_read_unlock_bh();
1da177e4
LT		 3775}
3776
3777#ifdef CONFIG_SYSCTL
3778
3779static
3780int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3781 void __user *buffer, size_t *lenp, loff_t *ppos)
3782{
3783 int *valp = ctl->data;
3784 int val = *valp;
3785 int ret;
3786
3787 ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3788
c8fecf22
PE		 3789 if (write)
3790 addrconf_fixup_forwarding(ctl, valp, val);
1ab1457c 3791 return ret;
1da177e4
LT		 3792}
3793
1ab1457c 3794static int addrconf_sysctl_forward_strategy(ctl_table *table,
1da177e4
LT		 3795 int __user *name, int nlen,
3796 void __user *oldval,
3797 size_t __user *oldlenp,
1f29bcd7 3798 void __user *newval, size_t newlen)
1da177e4
LT		 3799{
3800 int *valp = table->data;
c8fecf22 3801 int val = *valp;
1da177e4
LT		 3802 int new;
3803
3804 if (!newval || !newlen)
3805 return 0;
3806 if (newlen != sizeof(int))
3807 return -EINVAL;
3808 if (get_user(new, (int __user *)newval))
3809 return -EFAULT;
3810 if (new == *valp)
3811 return 0;
3812 if (oldval && oldlenp) {
3813 size_t len;
3814 if (get_user(len, oldlenp))
3815 return -EFAULT;
3816 if (len) {
3817 if (len > table->maxlen)
3818 len = table->maxlen;
3819 if (copy_to_user(oldval, valp, len))
3820 return -EFAULT;
3821 if (put_user(len, oldlenp))
3822 return -EFAULT;
3823 }
3824 }
3825
c8fecf22
PE		 3826 *valp = new;
3827 addrconf_fixup_forwarding(table, valp, val);
1da177e4
LT		 3828 return 1;
3829}
3830
3831static struct addrconf_sysctl_table
3832{
3833 struct ctl_table_header *sysctl_header;
3834 ctl_table addrconf_vars[__NET_IPV6_MAX];
1dab6222 3835 char *dev_name;
ab32ea5d 3836} addrconf_sysctl __read_mostly = {
1da177e4
LT		 3837 .sysctl_header = NULL,
3838 .addrconf_vars = {
1ab1457c 3839 {
1da177e4
LT		 3840 .ctl_name = NET_IPV6_FORWARDING,
3841 .procname = "forwarding",
1ab1457c 3842 .data = &ipv6_devconf.forwarding,
1da177e4
LT		 3843 .maxlen = sizeof(int),
3844 .mode = 0644,
1ab1457c 3845 .proc_handler = &addrconf_sysctl_forward,
1da177e4
LT		 3846 .strategy = &addrconf_sysctl_forward_strategy,
3847 },
3848 {
3849 .ctl_name = NET_IPV6_HOP_LIMIT,
3850 .procname = "hop_limit",
1ab1457c 3851 .data = &ipv6_devconf.hop_limit,
1da177e4
LT		 3852 .maxlen = sizeof(int),
3853 .mode = 0644,
3854 .proc_handler = proc_dointvec,
3855 },
3856 {
3857 .ctl_name = NET_IPV6_MTU,
3858 .procname = "mtu",
3859 .data = &ipv6_devconf.mtu6,
1ab1457c 3860 .maxlen = sizeof(int),
1da177e4 3861 .mode = 0644,
1ab1457c 3862 .proc_handler = &proc_dointvec,
1da177e4
LT		 3863 },
3864 {
3865 .ctl_name = NET_IPV6_ACCEPT_RA,
3866 .procname = "accept_ra",
1ab1457c 3867 .data = &ipv6_devconf.accept_ra,
1da177e4
LT		 3868 .maxlen = sizeof(int),
3869 .mode = 0644,
1ab1457c 3870 .proc_handler = &proc_dointvec,
1da177e4
LT		 3871 },
3872 {
3873 .ctl_name = NET_IPV6_ACCEPT_REDIRECTS,
3874 .procname = "accept_redirects",
1ab1457c 3875 .data = &ipv6_devconf.accept_redirects,
1da177e4
LT		 3876 .maxlen = sizeof(int),
3877 .mode = 0644,
1ab1457c 3878 .proc_handler = &proc_dointvec,
1da177e4
LT		 3879 },
3880 {
3881 .ctl_name = NET_IPV6_AUTOCONF,
3882 .procname = "autoconf",
1ab1457c 3883 .data = &ipv6_devconf.autoconf,
1da177e4
LT		 3884 .maxlen = sizeof(int),
3885 .mode = 0644,
1ab1457c 3886 .proc_handler = &proc_dointvec,
1da177e4
LT		 3887 },
3888 {
3889 .ctl_name = NET_IPV6_DAD_TRANSMITS,
3890 .procname = "dad_transmits",
1ab1457c 3891 .data = &ipv6_devconf.dad_transmits,
1da177e4
LT		 3892 .maxlen = sizeof(int),
3893 .mode = 0644,
1ab1457c 3894 .proc_handler = &proc_dointvec,
1da177e4
LT		 3895 },
3896 {
3897 .ctl_name = NET_IPV6_RTR_SOLICITS,
3898 .procname = "router_solicitations",
1ab1457c 3899 .data = &ipv6_devconf.rtr_solicits,
1da177e4
LT		 3900 .maxlen = sizeof(int),
3901 .mode = 0644,
1ab1457c 3902 .proc_handler = &proc_dointvec,
1da177e4
LT		 3903 },
3904 {
3905 .ctl_name = NET_IPV6_RTR_SOLICIT_INTERVAL,
3906 .procname = "router_solicitation_interval",
1ab1457c 3907 .data = &ipv6_devconf.rtr_solicit_interval,
1da177e4
LT		 3908 .maxlen = sizeof(int),
3909 .mode = 0644,
1ab1457c 3910 .proc_handler = &proc_dointvec_jiffies,
1da177e4
LT		 3911 .strategy = &sysctl_jiffies,
3912 },
3913 {
3914 .ctl_name = NET_IPV6_RTR_SOLICIT_DELAY,
3915 .procname = "router_solicitation_delay",
1ab1457c 3916 .data = &ipv6_devconf.rtr_solicit_delay,
1da177e4
LT		 3917 .maxlen = sizeof(int),
3918 .mode = 0644,
1ab1457c 3919 .proc_handler = &proc_dointvec_jiffies,
1da177e4
LT		 3920 .strategy = &sysctl_jiffies,
3921 },
3922 {
3923 .ctl_name = NET_IPV6_FORCE_MLD_VERSION,
3924 .procname = "force_mld_version",
1ab1457c 3925 .data = &ipv6_devconf.force_mld_version,
1da177e4
LT		 3926 .maxlen = sizeof(int),
3927 .mode = 0644,
1ab1457c 3928 .proc_handler = &proc_dointvec,
1da177e4
LT		 3929 },
3930#ifdef CONFIG_IPV6_PRIVACY
3931 {
3932 .ctl_name = NET_IPV6_USE_TEMPADDR,
3933 .procname = "use_tempaddr",
1ab1457c 3934 .data = &ipv6_devconf.use_tempaddr,
1da177e4
LT		 3935 .maxlen = sizeof(int),
3936 .mode = 0644,
1ab1457c 3937 .proc_handler = &proc_dointvec,
1da177e4
LT		 3938 },
3939 {
3940 .ctl_name = NET_IPV6_TEMP_VALID_LFT,
3941 .procname = "temp_valid_lft",
1ab1457c 3942 .data = &ipv6_devconf.temp_valid_lft,
1da177e4
LT		 3943 .maxlen = sizeof(int),
3944 .mode = 0644,
1ab1457c 3945 .proc_handler = &proc_dointvec,
1da177e4
LT		 3946 },
3947 {
3948 .ctl_name = NET_IPV6_TEMP_PREFERED_LFT,
3949 .procname = "temp_prefered_lft",
1ab1457c 3950 .data = &ipv6_devconf.temp_prefered_lft,
1da177e4
LT		 3951 .maxlen = sizeof(int),
3952 .mode = 0644,
1ab1457c 3953 .proc_handler = &proc_dointvec,
1da177e4
LT		 3954 },
3955 {
3956 .ctl_name = NET_IPV6_REGEN_MAX_RETRY,
3957 .procname = "regen_max_retry",
1ab1457c 3958 .data = &ipv6_devconf.regen_max_retry,
1da177e4
LT		 3959 .maxlen = sizeof(int),
3960 .mode = 0644,
1ab1457c 3961 .proc_handler = &proc_dointvec,
1da177e4
LT		 3962 },
3963 {
3964 .ctl_name = NET_IPV6_MAX_DESYNC_FACTOR,
3965 .procname = "max_desync_factor",
1ab1457c 3966 .data = &ipv6_devconf.max_desync_factor,
1da177e4
LT		 3967 .maxlen = sizeof(int),
3968 .mode = 0644,
1ab1457c 3969 .proc_handler = &proc_dointvec,
1da177e4
LT		 3970 },
3971#endif
3972 {
3973 .ctl_name = NET_IPV6_MAX_ADDRESSES,
3974 .procname = "max_addresses",
3975 .data = &ipv6_devconf.max_addresses,
3976 .maxlen = sizeof(int),
3977 .mode = 0644,
3978 .proc_handler = &proc_dointvec,
3979 },
65f5c7c1
YH		 3980 {
3981 .ctl_name = NET_IPV6_ACCEPT_RA_DEFRTR,
3982 .procname = "accept_ra_defrtr",
1ab1457c 3983 .data = &ipv6_devconf.accept_ra_defrtr,
65f5c7c1
YH		 3984 .maxlen = sizeof(int),
3985 .mode = 0644,
1ab1457c 3986 .proc_handler = &proc_dointvec,
65f5c7c1 3987 },
c4fd30eb
YH		 3988 {
3989 .ctl_name = NET_IPV6_ACCEPT_RA_PINFO,
3990 .procname = "accept_ra_pinfo",
1ab1457c 3991 .data = &ipv6_devconf.accept_ra_pinfo,
c4fd30eb
YH		 3992 .maxlen = sizeof(int),
3993 .mode = 0644,
1ab1457c 3994 .proc_handler = &proc_dointvec,
c4fd30eb 3995 },
930d6ff2
YH		 3996#ifdef CONFIG_IPV6_ROUTER_PREF
3997 {
3998 .ctl_name = NET_IPV6_ACCEPT_RA_RTR_PREF,
3999 .procname = "accept_ra_rtr_pref",
4000 .data = &ipv6_devconf.accept_ra_rtr_pref,
4001 .maxlen = sizeof(int),
4002 .mode = 0644,
4003 .proc_handler = &proc_dointvec,
4004 },
52e16356
YH		 4005 {
4006 .ctl_name = NET_IPV6_RTR_PROBE_INTERVAL,
4007 .procname = "router_probe_interval",
4008 .data = &ipv6_devconf.rtr_probe_interval,
4009 .maxlen = sizeof(int),
4010 .mode = 0644,
4011 .proc_handler = &proc_dointvec_jiffies,
4012 .strategy = &sysctl_jiffies,
4013 },
fa03ef38 4014#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 4015 {
4016 .ctl_name = NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN,
4017 .procname = "accept_ra_rt_info_max_plen",
4018 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4019 .maxlen = sizeof(int),
4020 .mode = 0644,
4021 .proc_handler = &proc_dointvec,
4022 },
4023#endif
930d6ff2 4024#endif
fbea49e1
YH		 4025 {
4026 .ctl_name = NET_IPV6_PROXY_NDP,
4027 .procname = "proxy_ndp",
4028 .data = &ipv6_devconf.proxy_ndp,
4029 .maxlen = sizeof(int),
4030 .mode = 0644,
4031 .proc_handler = &proc_dointvec,
4032 },
0bcbc926
YH		 4033 {
4034 .ctl_name = NET_IPV6_ACCEPT_SOURCE_ROUTE,
4035 .procname = "accept_source_route",
4036 .data = &ipv6_devconf.accept_source_route,
4037 .maxlen = sizeof(int),
4038 .mode = 0644,
4039 .proc_handler = &proc_dointvec,
4040 },
95c385b4
NH		 4041#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4042 {
4043 .ctl_name = CTL_UNNUMBERED,
4044 .procname = "optimistic_dad",
4045 .data = &ipv6_devconf.optimistic_dad,
4046 .maxlen = sizeof(int),
4047 .mode = 0644,
4048 .proc_handler = &proc_dointvec,
4049
4050 },
4051#endif
1da177e4
LT		 4052 {
4053 .ctl_name = 0, /* sentinel */
4054 }
4055 },
1da177e4
LT		 4056};
4057
f52295a9
PE		 4058static void __addrconf_sysctl_register(char *dev_name, int ctl_name,
4059 struct inet6_dev *idev, struct ipv6_devconf *p)
1da177e4
LT		 4060{
4061 int i;
1da177e4 4062 struct addrconf_sysctl_table *t;
1da177e4 4063
1dab6222
PE		 4064#define ADDRCONF_CTL_PATH_DEV 3
4065
4066 struct ctl_path addrconf_ctl_path[] = {
4067 { .procname = "net", .ctl_name = CTL_NET, },
4068 { .procname = "ipv6", .ctl_name = NET_IPV6, },
4069 { .procname = "conf", .ctl_name = NET_IPV6_CONF, },
4070 { /* to be set */ },
4071 { },
4072 };
4073
4074
af879cc7 4075 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
1da177e4 4076 if (t == NULL)
f68635e6
PE		 4077 goto out;
4078
1da177e4
LT		 4079 for (i=0; t->addrconf_vars[i].data; i++) {
4080 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
1da177e4
LT		 4081 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4082 }
1da177e4 4083
1ab1457c
YH		 4084 /*
4085 * Make a copy of dev_name, because '.procname' is regarded as const
1da177e4
LT		 4086 * by sysctl and we wouldn't want anyone to change it under our feet
4087 * (see SIOCSIFNAME).
1ab1457c 4088 */
1dab6222
PE		 4089 t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4090 if (!t->dev_name)
f68635e6 4091 goto free;
1da177e4 4092
1dab6222
PE		 4093 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
4094 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].ctl_name = ctl_name;
1da177e4 4095
1dab6222
PE		 4096 t->sysctl_header = register_sysctl_paths(addrconf_ctl_path,
4097 t->addrconf_vars);
1da177e4
LT		 4098 if (t->sysctl_header == NULL)
4099 goto free_procname;
f68635e6
PE		 4100
4101 p->sysctl = t;
1da177e4
LT		 4102 return;
4103
f68635e6 4104free_procname:
1dab6222 4105 kfree(t->dev_name);
f68635e6 4106free:
1da177e4 4107 kfree(t);
f68635e6 4108out:
1da177e4
LT		 4109 return;
4110}
4111
f52295a9
PE		 4112static void addrconf_sysctl_register(struct inet6_dev *idev)
4113{
4114 __addrconf_sysctl_register(idev->dev->name, idev->dev->ifindex,
4115 idev, &idev->cnf);
4116}
4117
1da177e4
LT		 4118static void addrconf_sysctl_unregister(struct ipv6_devconf *p)
4119{
4120 if (p->sysctl) {
4121 struct addrconf_sysctl_table *t = p->sysctl;
4122 p->sysctl = NULL;
4123 unregister_sysctl_table(t->sysctl_header);
1dab6222 4124 kfree(t->dev_name);
1da177e4
LT		 4125 kfree(t);
4126 }
4127}
4128
4129
4130#endif
4131
4132/*
4133 * Device notifier
4134 */
4135
4136int register_inet6addr_notifier(struct notifier_block *nb)
4137{
1ab1457c 4138 return atomic_notifier_chain_register(&inet6addr_chain, nb);
1da177e4
LT		 4139}
4140
7159039a
YH		 4141EXPORT_SYMBOL(register_inet6addr_notifier);
4142
1da177e4
LT		 4143int unregister_inet6addr_notifier(struct notifier_block *nb)
4144{
1ab1457c 4145 return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
1da177e4
LT		 4146}
4147
7159039a
YH		 4148EXPORT_SYMBOL(unregister_inet6addr_notifier);
4149
1da177e4
LT		 4150/*
4151 * Init / cleanup code
4152 */
4153
4154int __init addrconf_init(void)
4155{
2a8cc6c8
YH		 4156 int err;
4157
4158 if ((err = ipv6_addr_label_init()) < 0) {
4159 printk(KERN_CRIT "IPv6 Addrconf: cannot initialize default policy table: %d.\n",
4160 err);
4161 return err;
4162 }
1da177e4
LT		 4163
4164 /* The addrconf netdev notifier requires that loopback_dev
4165 * has it's ipv6 private information allocated and setup
4166 * before it can bring up and give link-local addresses
4167 * to other devices which are up.
4168 *
4169 * Unfortunately, loopback_dev is not necessarily the first
4170 * entry in the global dev_base list of net devices. In fact,
4171 * it is likely to be the very last entry on that list.
4172 * So this causes the notifier registry below to try and
4173 * give link-local addresses to all devices besides loopback_dev
4174 * first, then loopback_dev, which cases all the non-loopback_dev
4175 * devices to fail to get a link-local address.
4176 *
4177 * So, as a temporary fix, allocate the ipv6 structure for
4178 * loopback_dev first by hand.
4179 * Longer term, all of the dependencies ipv6 has upon the loopback
4180 * device and it being up should be removed.
4181 */
4182 rtnl_lock();
2774c7ab 4183 if (!ipv6_add_dev(init_net.loopback_dev))
1da177e4
LT		 4184 err = -ENOMEM;
4185 rtnl_unlock();
4186 if (err)
4187 return err;
4188
2774c7ab
EB		 4189 ip6_null_entry.u.dst.dev = init_net.loopback_dev;
4190 ip6_null_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev);
9a6bf6fe 4191#ifdef CONFIG_IPV6_MULTIPLE_TABLES
2774c7ab
EB		 4192 ip6_prohibit_entry.u.dst.dev = init_net.loopback_dev;
4193 ip6_prohibit_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev);
4194 ip6_blk_hole_entry.u.dst.dev = init_net.loopback_dev;
4195 ip6_blk_hole_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev);
9a6bf6fe 4196#endif
c62dba90 4197
1da177e4
LT		 4198 register_netdevice_notifier(&ipv6_dev_notf);
4199
1da177e4 4200 addrconf_verify(0);
c127ea2c
TG		 4201
4202 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4203 if (err < 0)
4204 goto errout;
4205
4206 /* Only the first call to __rtnl_register can fail */
4207 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4208 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4209 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4210 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4211 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4212
2a8cc6c8
YH		 4213 ipv6_addr_label_rtnl_register();
4214
1da177e4 4215#ifdef CONFIG_SYSCTL
f52295a9
PE		 4216 __addrconf_sysctl_register("all", NET_PROTO_CONF_ALL,
4217 NULL, &ipv6_devconf);
4218 __addrconf_sysctl_register("default", NET_PROTO_CONF_DEFAULT,
4219 NULL, &ipv6_devconf_dflt);
1da177e4
LT		 4220#endif
4221
4222 return 0;
c127ea2c
TG		 4223errout:
4224 unregister_netdevice_notifier(&ipv6_dev_notf);
4225
4226 return err;
1da177e4
LT		 4227}
4228
4229void __exit addrconf_cleanup(void)
4230{
1ab1457c 4231 struct net_device *dev;
1ab1457c 4232 struct inet6_ifaddr *ifa;
1da177e4
LT		 4233 int i;
4234
4235 unregister_netdevice_notifier(&ipv6_dev_notf);
4236
1da177e4
LT		 4237#ifdef CONFIG_SYSCTL
4238 addrconf_sysctl_unregister(&ipv6_devconf_dflt);
4239 addrconf_sysctl_unregister(&ipv6_devconf);
4240#endif
4241
4242 rtnl_lock();
4243
4244 /*
4245 * clean dev list.
4246 */
4247
881d966b 4248 for_each_netdev(&init_net, dev) {
dffe4f04 4249 if (__in6_dev_get(dev) == NULL)
1da177e4
LT		 4250 continue;
4251 addrconf_ifdown(dev, 1);
4252 }
2774c7ab 4253 addrconf_ifdown(init_net.loopback_dev, 2);
1da177e4
LT		 4254
4255 /*
4256 * Check hash table.
4257 */
4258
4259 write_lock_bh(&addrconf_hash_lock);
4260 for (i=0; i < IN6_ADDR_HSIZE; i++) {
4261 for (ifa=inet6_addr_lst[i]; ifa; ) {
4262 struct inet6_ifaddr *bifa;
4263
4264 bifa = ifa;
4265 ifa = ifa->lst_next;
4266 printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
4267 /* Do not free it; something is wrong.
4268 Now we can investigate it with debugger.
4269 */
4270 }
4271 }
4272 write_unlock_bh(&addrconf_hash_lock);
4273
4274 del_timer(&addr_chk_timer);
4275
4276 rtnl_unlock();
1da177e4 4277}
Linux kernel - Deliverables
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