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[NETNS]: Make the __addrconf_sysctl_register return an error
[linux-2.6-block.git] / net / ipv6 / addrconf.c
CommitLineData
1da177e4
LT		 1/*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
1ab1457c 6 * Pedro Roque <roque@di.fc.ul.pt>
1da177e4
LT		 7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
9 * $Id: addrconf.c,v 1.69 2001/10/31 21:55:54 davem Exp $
10 *
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License
13 * as published by the Free Software Foundation; either version
14 * 2 of the License, or (at your option) any later version.
15 */
16
17/*
18 * Changes:
19 *
20 * Janos Farkas : delete timer on ifdown
21 * <chexum@bankinf.banki.hu>
22 * Andi Kleen : kill double kfree on module
23 * unload.
24 * Maciej W. Rozycki : FDDI support
25 * sekiya@USAGI : Don't send too many RS
26 * packets.
27 * yoshfuji@USAGI : Fixed interval between DAD
28 * packets.
29 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
30 * address validation timer.
31 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
32 * support.
33 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
34 * address on a same interface.
35 * YOSHIFUJI Hideaki @USAGI : ARCnet support
36 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
37 * seq_file.
b1cacb68
YH		 38 * YOSHIFUJI Hideaki @USAGI : improved source address
39 * selection; consider scope,
40 * status etc.
1da177e4
LT		 41 */
42
1da177e4
LT		 43#include <linux/errno.h>
44#include <linux/types.h>
45#include <linux/socket.h>
46#include <linux/sockios.h>
1da177e4
LT		 47#include <linux/net.h>
48#include <linux/in6.h>
49#include <linux/netdevice.h>
1823730f 50#include <linux/if_addr.h>
1da177e4
LT		 51#include <linux/if_arp.h>
52#include <linux/if_arcnet.h>
53#include <linux/if_infiniband.h>
54#include <linux/route.h>
55#include <linux/inetdevice.h>
56#include <linux/init.h>
57#ifdef CONFIG_SYSCTL
58#include <linux/sysctl.h>
59#endif
4fc268d2 60#include <linux/capability.h>
1da177e4
LT		 61#include <linux/delay.h>
62#include <linux/notifier.h>
543537bd 63#include <linux/string.h>
1da177e4 64
457c4cbc 65#include <net/net_namespace.h>
1da177e4
LT		 66#include <net/sock.h>
67#include <net/snmp.h>
68
69#include <net/ipv6.h>
70#include <net/protocol.h>
71#include <net/ndisc.h>
72#include <net/ip6_route.h>
73#include <net/addrconf.h>
74#include <net/tcp.h>
75#include <net/ip.h>
5d620266 76#include <net/netlink.h>
f24e3d65 77#include <net/pkt_sched.h>
1da177e4
LT		 78#include <linux/if_tunnel.h>
79#include <linux/rtnetlink.h>
80
81#ifdef CONFIG_IPV6_PRIVACY
82#include <linux/random.h>
1da177e4
LT		 83#endif
84
85#include <asm/uaccess.h>
7f7d9a6b 86#include <asm/unaligned.h>
1da177e4
LT		 87
88#include <linux/proc_fs.h>
89#include <linux/seq_file.h>
90
91/* Set to 3 to get tracing... */
92#define ACONF_DEBUG 2
93
94#if ACONF_DEBUG >= 3
95#define ADBG(x) printk x
96#else
97#define ADBG(x)
98#endif
99
100#define INFINITY_LIFE_TIME 0xFFFFFFFF
101#define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b)))
102
103#ifdef CONFIG_SYSCTL
f52295a9 104static void addrconf_sysctl_register(struct inet6_dev *idev);
408c4768
PE		 105static void addrconf_sysctl_unregister(struct inet6_dev *idev);
106#else
107static inline void addrconf_sysctl_register(struct inet6_dev *idev)
108{
109}
110
111static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
112{
113}
1da177e4
LT		 114#endif
115
116#ifdef CONFIG_IPV6_PRIVACY
117static int __ipv6_regen_rndid(struct inet6_dev *idev);
1ab1457c 118static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
1da177e4
LT		 119static void ipv6_regen_rndid(unsigned long data);
120
121static int desync_factor = MAX_DESYNC_FACTOR * HZ;
1da177e4
LT		 122#endif
123
124static int ipv6_count_addresses(struct inet6_dev *idev);
125
126/*
127 * Configured unicast address hash table
128 */
129static struct inet6_ifaddr *inet6_addr_lst[IN6_ADDR_HSIZE];
130static DEFINE_RWLOCK(addrconf_hash_lock);
131
1da177e4
LT		 132static void addrconf_verify(unsigned long);
133
8d06afab 134static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
1da177e4
LT		 135static DEFINE_SPINLOCK(addrconf_verify_lock);
136
137static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
138static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
139
140static int addrconf_ifdown(struct net_device *dev, int how);
141
e431b8c0 142static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
1da177e4
LT		 143static void addrconf_dad_timer(unsigned long data);
144static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
c5e33bdd 145static void addrconf_dad_run(struct inet6_dev *idev);
1da177e4
LT		 146static void addrconf_rs_timer(unsigned long data);
147static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
148static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
149
1ab1457c 150static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 151 struct prefix_info *pinfo);
152static int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev);
153
e041c683 154static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
1da177e4 155
ab32ea5d 156struct ipv6_devconf ipv6_devconf __read_mostly = {
1da177e4
LT		 157 .forwarding = 0,
158 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
159 .mtu6 = IPV6_MIN_MTU,
160 .accept_ra = 1,
161 .accept_redirects = 1,
162 .autoconf = 1,
163 .force_mld_version = 0,
164 .dad_transmits = 1,
165 .rtr_solicits = MAX_RTR_SOLICITATIONS,
166 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
167 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
168#ifdef CONFIG_IPV6_PRIVACY
169 .use_tempaddr = 0,
170 .temp_valid_lft = TEMP_VALID_LIFETIME,
171 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
172 .regen_max_retry = REGEN_MAX_RETRY,
173 .max_desync_factor = MAX_DESYNC_FACTOR,
174#endif
175 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 176 .accept_ra_defrtr = 1,
c4fd30eb 177 .accept_ra_pinfo = 1,
930d6ff2
YH		 178#ifdef CONFIG_IPV6_ROUTER_PREF
179 .accept_ra_rtr_pref = 1,
52e16356 180 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 181#ifdef CONFIG_IPV6_ROUTE_INFO
182 .accept_ra_rt_info_max_plen = 0,
183#endif
930d6ff2 184#endif
fbea49e1 185 .proxy_ndp = 0,
0bcbc926 186 .accept_source_route = 0, /* we do not accept RH0 by default. */
1da177e4
LT		 187};
188
ab32ea5d 189static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
1da177e4
LT		 190 .forwarding = 0,
191 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
192 .mtu6 = IPV6_MIN_MTU,
193 .accept_ra = 1,
194 .accept_redirects = 1,
195 .autoconf = 1,
196 .dad_transmits = 1,
197 .rtr_solicits = MAX_RTR_SOLICITATIONS,
198 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
199 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
200#ifdef CONFIG_IPV6_PRIVACY
201 .use_tempaddr = 0,
202 .temp_valid_lft = TEMP_VALID_LIFETIME,
203 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
204 .regen_max_retry = REGEN_MAX_RETRY,
205 .max_desync_factor = MAX_DESYNC_FACTOR,
206#endif
207 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 208 .accept_ra_defrtr = 1,
c4fd30eb 209 .accept_ra_pinfo = 1,
930d6ff2
YH		 210#ifdef CONFIG_IPV6_ROUTER_PREF
211 .accept_ra_rtr_pref = 1,
52e16356 212 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 213#ifdef CONFIG_IPV6_ROUTE_INFO
214 .accept_ra_rt_info_max_plen = 0,
215#endif
930d6ff2 216#endif
fbea49e1 217 .proxy_ndp = 0,
0bcbc926 218 .accept_source_route = 0, /* we do not accept RH0 by default. */
1da177e4
LT		 219};
220
221/* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
1da177e4 222const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
1da177e4
LT		 223const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
224
f24e3d65
MC		 225/* Check if a valid qdisc is available */
226static inline int addrconf_qdisc_ok(struct net_device *dev)
227{
228 return (dev->qdisc != &noop_qdisc);
229}
230
1da177e4
LT		 231static void addrconf_del_timer(struct inet6_ifaddr *ifp)
232{
233 if (del_timer(&ifp->timer))
234 __in6_ifa_put(ifp);
235}
236
237enum addrconf_timer_t
238{
239 AC_NONE,
240 AC_DAD,
241 AC_RS,
242};
243
244static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
245 enum addrconf_timer_t what,
246 unsigned long when)
247{
248 if (!del_timer(&ifp->timer))
249 in6_ifa_hold(ifp);
250
251 switch (what) {
252 case AC_DAD:
253 ifp->timer.function = addrconf_dad_timer;
254 break;
255 case AC_RS:
256 ifp->timer.function = addrconf_rs_timer;
257 break;
258 default:;
259 }
260 ifp->timer.expires = jiffies + when;
261 add_timer(&ifp->timer);
262}
263
7f7d9a6b
HX		 264static int snmp6_alloc_dev(struct inet6_dev *idev)
265{
7f7d9a6b 266 if (snmp_mib_init((void **)idev->stats.ipv6,
c69bce20 267 sizeof(struct ipstats_mib)) < 0)
7f7d9a6b
HX		 268 goto err_ip;
269 if (snmp_mib_init((void **)idev->stats.icmpv6,
c69bce20 270 sizeof(struct icmpv6_mib)) < 0)
7f7d9a6b 271 goto err_icmp;
14878f75 272 if (snmp_mib_init((void **)idev->stats.icmpv6msg,
c69bce20 273 sizeof(struct icmpv6msg_mib)) < 0)
14878f75 274 goto err_icmpmsg;
7f7d9a6b
HX		 275
276 return 0;
277
14878f75
DS		 278err_icmpmsg:
279 snmp_mib_free((void **)idev->stats.icmpv6);
7f7d9a6b
HX		 280err_icmp:
281 snmp_mib_free((void **)idev->stats.ipv6);
282err_ip:
aaf70ec7 283 return -ENOMEM;
7f7d9a6b
HX		 284}
285
16910b98 286static void snmp6_free_dev(struct inet6_dev *idev)
7f7d9a6b 287{
14878f75 288 snmp_mib_free((void **)idev->stats.icmpv6msg);
7f7d9a6b
HX		 289 snmp_mib_free((void **)idev->stats.icmpv6);
290 snmp_mib_free((void **)idev->stats.ipv6);
7f7d9a6b
HX		 291}
292
1da177e4
LT		 293/* Nobody refers to this device, we may destroy it. */
294
8814c4b5
YH		 295static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
296{
297 struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
298 kfree(idev);
299}
300
1da177e4
LT		 301void in6_dev_finish_destroy(struct inet6_dev *idev)
302{
303 struct net_device *dev = idev->dev;
304 BUG_TRAP(idev->addr_list==NULL);
305 BUG_TRAP(idev->mc_list==NULL);
306#ifdef NET_REFCNT_DEBUG
307 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
308#endif
309 dev_put(dev);
310 if (!idev->dead) {
311 printk("Freeing alive inet6 device %p\n", idev);
312 return;
313 }
314 snmp6_free_dev(idev);
8814c4b5 315 call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
1da177e4
LT		 316}
317
7159039a
YH		 318EXPORT_SYMBOL(in6_dev_finish_destroy);
319
1da177e4
LT		 320static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
321{
322 struct inet6_dev *ndev;
d88ae4cc 323 struct in6_addr maddr;
1da177e4
LT		 324
325 ASSERT_RTNL();
326
327 if (dev->mtu < IPV6_MIN_MTU)
328 return NULL;
329
1ab1457c 330 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
322f74a4 331
1ab1457c
YH		 332 if (ndev == NULL)
333 return NULL;
322f74a4
IO		 334
335 rwlock_init(&ndev->lock);
336 ndev->dev = dev;
337 memcpy(&ndev->cnf, &ipv6_devconf_dflt, sizeof(ndev->cnf));
338 ndev->cnf.mtu6 = dev->mtu;
339 ndev->cnf.sysctl = NULL;
340 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
341 if (ndev->nd_parms == NULL) {
342 kfree(ndev);
343 return NULL;
344 }
345 /* We refer to the device */
346 dev_hold(dev);
1da177e4 347
322f74a4
IO		 348 if (snmp6_alloc_dev(ndev) < 0) {
349 ADBG((KERN_WARNING
350 "%s(): cannot allocate memory for statistics; dev=%s.\n",
351 __FUNCTION__, dev->name));
352 neigh_parms_release(&nd_tbl, ndev->nd_parms);
353 ndev->dead = 1;
354 in6_dev_finish_destroy(ndev);
355 return NULL;
356 }
1da177e4 357
322f74a4
IO		 358 if (snmp6_register_dev(ndev) < 0) {
359 ADBG((KERN_WARNING
360 "%s(): cannot create /proc/net/dev_snmp6/%s\n",
361 __FUNCTION__, dev->name));
362 neigh_parms_release(&nd_tbl, ndev->nd_parms);
363 ndev->dead = 1;
364 in6_dev_finish_destroy(ndev);
365 return NULL;
366 }
367
368 /* One reference from device. We must do this before
369 * we invoke __ipv6_regen_rndid().
370 */
371 in6_dev_hold(ndev);
1da177e4
LT		 372
373#ifdef CONFIG_IPV6_PRIVACY
b24b8a24 374 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
322f74a4
IO		 375 if ((dev->flags&IFF_LOOPBACK) ||
376 dev->type == ARPHRD_TUNNEL ||
0be669bb
JR		 377#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
378 dev->type == ARPHRD_SIT ||
379#endif
380 dev->type == ARPHRD_NONE) {
322f74a4
IO		 381 printk(KERN_INFO
382 "%s: Disabled Privacy Extensions\n",
383 dev->name);
384 ndev->cnf.use_tempaddr = -1;
c7dc89c0
FT		 385
386 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
387 printk(KERN_INFO
388 "%s: Disabled Multicast RS\n",
389 dev->name);
390 ndev->cnf.rtr_solicits = 0;
391 }
322f74a4
IO		 392 } else {
393 in6_dev_hold(ndev);
394 ipv6_regen_rndid((unsigned long) ndev);
395 }
1da177e4
LT		 396#endif
397
f24e3d65 398 if (netif_running(dev) && addrconf_qdisc_ok(dev))
53aadcc9
HX		 399 ndev->if_flags |= IF_READY;
400
322f74a4
IO		 401 ipv6_mc_init_dev(ndev);
402 ndev->tstamp = jiffies;
f52295a9 403 addrconf_sysctl_register(ndev);
30c4cf57
DS		 404 /* protected by rtnl_lock */
405 rcu_assign_pointer(dev->ip6_ptr, ndev);
d88ae4cc
YH		 406
407 /* Join all-node multicast group */
408 ipv6_addr_all_nodes(&maddr);
409 ipv6_dev_mc_inc(dev, &maddr);
410
1da177e4
LT		 411 return ndev;
412}
413
414static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
415{
416 struct inet6_dev *idev;
417
418 ASSERT_RTNL();
419
420 if ((idev = __in6_dev_get(dev)) == NULL) {
421 if ((idev = ipv6_add_dev(dev)) == NULL)
422 return NULL;
423 }
c5e33bdd 424
1da177e4
LT		 425 if (dev->flags&IFF_UP)
426 ipv6_mc_up(idev);
427 return idev;
428}
429
430#ifdef CONFIG_SYSCTL
431static void dev_forward_change(struct inet6_dev *idev)
432{
433 struct net_device *dev;
434 struct inet6_ifaddr *ifa;
435 struct in6_addr addr;
436
437 if (!idev)
438 return;
439 dev = idev->dev;
440 if (dev && (dev->flags & IFF_MULTICAST)) {
441 ipv6_addr_all_routers(&addr);
1ab1457c 442
1da177e4
LT		 443 if (idev->cnf.forwarding)
444 ipv6_dev_mc_inc(dev, &addr);
445 else
446 ipv6_dev_mc_dec(dev, &addr);
447 }
448 for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
2c12a74c
MW		 449 if (ifa->flags&IFA_F_TENTATIVE)
450 continue;
1da177e4
LT		 451 if (idev->cnf.forwarding)
452 addrconf_join_anycast(ifa);
453 else
454 addrconf_leave_anycast(ifa);
455 }
456}
457
458
459static void addrconf_forward_change(void)
460{
461 struct net_device *dev;
462 struct inet6_dev *idev;
463
464 read_lock(&dev_base_lock);
881d966b 465 for_each_netdev(&init_net, dev) {
8814c4b5 466 rcu_read_lock();
1da177e4
LT		 467 idev = __in6_dev_get(dev);
468 if (idev) {
469 int changed = (!idev->cnf.forwarding) ^ (!ipv6_devconf.forwarding);
470 idev->cnf.forwarding = ipv6_devconf.forwarding;
471 if (changed)
472 dev_forward_change(idev);
473 }
8814c4b5 474 rcu_read_unlock();
1da177e4
LT		 475 }
476 read_unlock(&dev_base_lock);
477}
c8fecf22
PE		 478
479static void addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old)
480{
481 if (p == &ipv6_devconf_dflt.forwarding)
482 return;
483
484 if (p == &ipv6_devconf.forwarding) {
485 ipv6_devconf_dflt.forwarding = ipv6_devconf.forwarding;
486 addrconf_forward_change();
487 } else if ((!*p) ^ (!old))
488 dev_forward_change((struct inet6_dev *)table->extra1);
489
490 if (*p)
491 rt6_purge_dflt_routers();
492}
1da177e4
LT		 493#endif
494
495/* Nobody refers to this ifaddr, destroy it */
496
497void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
498{
499 BUG_TRAP(ifp->if_next==NULL);
500 BUG_TRAP(ifp->lst_next==NULL);
501#ifdef NET_REFCNT_DEBUG
502 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
503#endif
504
505 in6_dev_put(ifp->idev);
506
507 if (del_timer(&ifp->timer))
508 printk("Timer is still running, when freeing ifa=%p\n", ifp);
509
510 if (!ifp->dead) {
511 printk("Freeing alive inet6 address %p\n", ifp);
512 return;
513 }
514 dst_release(&ifp->rt->u.dst);
515
516 kfree(ifp);
517}
518
e55ffac6
BH		 519static void
520ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
521{
522 struct inet6_ifaddr *ifa, **ifap;
8a6ce0c0 523 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
e55ffac6
BH		 524
525 /*
526 * Each device address list is sorted in order of scope -
527 * global before linklocal.
528 */
529 for (ifap = &idev->addr_list; (ifa = *ifap) != NULL;
530 ifap = &ifa->if_next) {
8a6ce0c0 531 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
e55ffac6
BH		 532 break;
533 }
534
535 ifp->if_next = *ifap;
536 *ifap = ifp;
537}
538
1da177e4
LT		 539/* On success it returns ifp with increased reference count */
540
541static struct inet6_ifaddr *
542ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
e431b8c0 543 int scope, u32 flags)
1da177e4
LT		 544{
545 struct inet6_ifaddr *ifa = NULL;
546 struct rt6_info *rt;
547 int hash;
548 int err = 0;
549
8814c4b5 550 rcu_read_lock_bh();
1da177e4
LT		 551 if (idev->dead) {
552 err = -ENODEV; /*XXX*/
553 goto out2;
554 }
555
556 write_lock(&addrconf_hash_lock);
557
558 /* Ignore adding duplicate addresses on an interface */
559 if (ipv6_chk_same_addr(addr, idev->dev)) {
560 ADBG(("ipv6_add_addr: already assigned\n"));
561 err = -EEXIST;
562 goto out;
563 }
564
322f74a4 565 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
1da177e4
LT		 566
567 if (ifa == NULL) {
568 ADBG(("ipv6_add_addr: malloc failed\n"));
569 err = -ENOBUFS;
570 goto out;
571 }
572
573 rt = addrconf_dst_alloc(idev, addr, 0);
574 if (IS_ERR(rt)) {
575 err = PTR_ERR(rt);
576 goto out;
577 }
578
1da177e4
LT		 579 ipv6_addr_copy(&ifa->addr, addr);
580
581 spin_lock_init(&ifa->lock);
582 init_timer(&ifa->timer);
583 ifa->timer.data = (unsigned long) ifa;
584 ifa->scope = scope;
585 ifa->prefix_len = pfxlen;
586 ifa->flags = flags | IFA_F_TENTATIVE;
587 ifa->cstamp = ifa->tstamp = jiffies;
588
57f5f544
KF		 589 ifa->rt = rt;
590
95c385b4
NH		 591 /*
592 * part one of RFC 4429, section 3.3
593 * We should not configure an address as
594 * optimistic if we do not yet know the link
595 * layer address of our nexhop router
596 */
597
598 if (rt->rt6i_nexthop == NULL)
599 ifa->flags &= ~IFA_F_OPTIMISTIC;
600
1da177e4
LT		 601 ifa->idev = idev;
602 in6_dev_hold(idev);
603 /* For caller */
604 in6_ifa_hold(ifa);
605
606 /* Add to big hash table */
607 hash = ipv6_addr_hash(addr);
608
609 ifa->lst_next = inet6_addr_lst[hash];
610 inet6_addr_lst[hash] = ifa;
611 in6_ifa_hold(ifa);
612 write_unlock(&addrconf_hash_lock);
613
614 write_lock(&idev->lock);
615 /* Add to inet6_dev unicast addr list. */
e55ffac6 616 ipv6_link_dev_addr(idev, ifa);
1da177e4
LT		 617
618#ifdef CONFIG_IPV6_PRIVACY
619 if (ifa->flags&IFA_F_TEMPORARY) {
620 ifa->tmp_next = idev->tempaddr_list;
621 idev->tempaddr_list = ifa;
622 in6_ifa_hold(ifa);
623 }
624#endif
625
1da177e4
LT		 626 in6_ifa_hold(ifa);
627 write_unlock(&idev->lock);
628out2:
8814c4b5 629 rcu_read_unlock_bh();
1da177e4 630
fd92833a 631 if (likely(err == 0))
e041c683 632 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
1da177e4
LT		 633 else {
634 kfree(ifa);
635 ifa = ERR_PTR(err);
636 }
637
638 return ifa;
639out:
640 write_unlock(&addrconf_hash_lock);
641 goto out2;
642}
643
644/* This function wants to get referenced ifp and releases it before return */
645
646static void ipv6_del_addr(struct inet6_ifaddr *ifp)
647{
648 struct inet6_ifaddr *ifa, **ifap;
649 struct inet6_dev *idev = ifp->idev;
650 int hash;
651 int deleted = 0, onlink = 0;
652 unsigned long expires = jiffies;
653
654 hash = ipv6_addr_hash(&ifp->addr);
655
656 ifp->dead = 1;
657
658 write_lock_bh(&addrconf_hash_lock);
659 for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
660 ifap = &ifa->lst_next) {
661 if (ifa == ifp) {
662 *ifap = ifa->lst_next;
663 __in6_ifa_put(ifp);
664 ifa->lst_next = NULL;
665 break;
666 }
667 }
668 write_unlock_bh(&addrconf_hash_lock);
669
670 write_lock_bh(&idev->lock);
671#ifdef CONFIG_IPV6_PRIVACY
672 if (ifp->flags&IFA_F_TEMPORARY) {
673 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
674 ifap = &ifa->tmp_next) {
675 if (ifa == ifp) {
676 *ifap = ifa->tmp_next;
677 if (ifp->ifpub) {
678 in6_ifa_put(ifp->ifpub);
679 ifp->ifpub = NULL;
680 }
681 __in6_ifa_put(ifp);
682 ifa->tmp_next = NULL;
683 break;
684 }
685 }
686 }
687#endif
688
1d142804 689 for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
1da177e4
LT		 690 if (ifa == ifp) {
691 *ifap = ifa->if_next;
692 __in6_ifa_put(ifp);
693 ifa->if_next = NULL;
694 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
695 break;
696 deleted = 1;
1d142804 697 continue;
1da177e4
LT		 698 } else if (ifp->flags & IFA_F_PERMANENT) {
699 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
700 ifp->prefix_len)) {
701 if (ifa->flags & IFA_F_PERMANENT) {
702 onlink = 1;
703 if (deleted)
704 break;
705 } else {
706 unsigned long lifetime;
707
708 if (!onlink)
709 onlink = -1;
710
711 spin_lock(&ifa->lock);
712 lifetime = min_t(unsigned long,
713 ifa->valid_lft, 0x7fffffffUL/HZ);
714 if (time_before(expires,
715 ifa->tstamp + lifetime * HZ))
716 expires = ifa->tstamp + lifetime * HZ;
717 spin_unlock(&ifa->lock);
718 }
719 }
720 }
1d142804 721 ifap = &ifa->if_next;
1da177e4
LT		 722 }
723 write_unlock_bh(&idev->lock);
724
725 ipv6_ifa_notify(RTM_DELADDR, ifp);
726
e041c683 727 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
1da177e4
LT		 728
729 addrconf_del_timer(ifp);
730
731 /*
732 * Purge or update corresponding prefix
733 *
734 * 1) we don't purge prefix here if address was not permanent.
735 * prefix is managed by its own lifetime.
736 * 2) if there're no addresses, delete prefix.
737 * 3) if there're still other permanent address(es),
738 * corresponding prefix is still permanent.
739 * 4) otherwise, update prefix lifetime to the
740 * longest valid lifetime among the corresponding
741 * addresses on the device.
742 * Note: subsequent RA will update lifetime.
743 *
744 * --yoshfuji
745 */
746 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
747 struct in6_addr prefix;
748 struct rt6_info *rt;
749
750 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
751 rt = rt6_lookup(&prefix, NULL, ifp->idev->dev->ifindex, 1);
752
753 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
754 if (onlink == 0) {
e0a1ad73 755 ip6_del_rt(rt);
1da177e4
LT		 756 rt = NULL;
757 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
758 rt->rt6i_expires = expires;
759 rt->rt6i_flags |= RTF_EXPIRES;
760 }
761 }
762 dst_release(&rt->u.dst);
763 }
764
765 in6_ifa_put(ifp);
766}
767
768#ifdef CONFIG_IPV6_PRIVACY
769static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
770{
771 struct inet6_dev *idev = ifp->idev;
772 struct in6_addr addr, *tmpaddr;
773 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
774 int tmp_plen;
775 int ret = 0;
776 int max_addresses;
95c385b4 777 u32 addr_flags;
1da177e4
LT		 778
779 write_lock(&idev->lock);
780 if (ift) {
781 spin_lock_bh(&ift->lock);
782 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
783 spin_unlock_bh(&ift->lock);
784 tmpaddr = &addr;
785 } else {
786 tmpaddr = NULL;
787 }
788retry:
789 in6_dev_hold(idev);
790 if (idev->cnf.use_tempaddr <= 0) {
791 write_unlock(&idev->lock);
792 printk(KERN_INFO
793 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
794 in6_dev_put(idev);
795 ret = -1;
796 goto out;
797 }
798 spin_lock_bh(&ifp->lock);
799 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
800 idev->cnf.use_tempaddr = -1; /*XXX*/
801 spin_unlock_bh(&ifp->lock);
802 write_unlock(&idev->lock);
803 printk(KERN_WARNING
804 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
805 in6_dev_put(idev);
806 ret = -1;
807 goto out;
808 }
809 in6_ifa_hold(ifp);
810 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
811 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
812 spin_unlock_bh(&ifp->lock);
813 write_unlock(&idev->lock);
814 printk(KERN_WARNING
815 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
816 in6_ifa_put(ifp);
817 in6_dev_put(idev);
818 ret = -1;
819 goto out;
820 }
821 memcpy(&addr.s6_addr[8], idev->rndid, 8);
822 tmp_valid_lft = min_t(__u32,
823 ifp->valid_lft,
824 idev->cnf.temp_valid_lft);
1ab1457c
YH		 825 tmp_prefered_lft = min_t(__u32,
826 ifp->prefered_lft,
1da177e4
LT		 827 idev->cnf.temp_prefered_lft - desync_factor / HZ);
828 tmp_plen = ifp->prefix_len;
829 max_addresses = idev->cnf.max_addresses;
830 tmp_cstamp = ifp->cstamp;
831 tmp_tstamp = ifp->tstamp;
832 spin_unlock_bh(&ifp->lock);
833
834 write_unlock(&idev->lock);
95c385b4
NH		 835
836 addr_flags = IFA_F_TEMPORARY;
837 /* set in addrconf_prefix_rcv() */
838 if (ifp->flags & IFA_F_OPTIMISTIC)
839 addr_flags |= IFA_F_OPTIMISTIC;
840
1da177e4 841 ift = !max_addresses ||
1ab1457c 842 ipv6_count_addresses(idev) < max_addresses ?
1da177e4 843 ipv6_add_addr(idev, &addr, tmp_plen,
95c385b4
NH		 844 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
845 addr_flags) : NULL;
1da177e4
LT		 846 if (!ift || IS_ERR(ift)) {
847 in6_ifa_put(ifp);
848 in6_dev_put(idev);
849 printk(KERN_INFO
850 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
851 tmpaddr = &addr;
852 write_lock(&idev->lock);
853 goto retry;
854 }
855
856 spin_lock_bh(&ift->lock);
857 ift->ifpub = ifp;
858 ift->valid_lft = tmp_valid_lft;
859 ift->prefered_lft = tmp_prefered_lft;
860 ift->cstamp = tmp_cstamp;
861 ift->tstamp = tmp_tstamp;
862 spin_unlock_bh(&ift->lock);
863
864 addrconf_dad_start(ift, 0);
865 in6_ifa_put(ift);
866 in6_dev_put(idev);
867out:
868 return ret;
869}
870#endif
871
872/*
072047e4 873 * Choose an appropriate source address (RFC3484)
1da177e4 874 */
072047e4
YH		 875struct ipv6_saddr_score {
876 int addr_type;
877 unsigned int attrs;
878 int matchlen;
0d27b427 879 int scope;
072047e4
YH		 880 unsigned int rule;
881};
882
883#define IPV6_SADDR_SCORE_LOCAL 0x0001
884#define IPV6_SADDR_SCORE_PREFERRED 0x0004
885#define IPV6_SADDR_SCORE_HOA 0x0008
886#define IPV6_SADDR_SCORE_OIF 0x0010
887#define IPV6_SADDR_SCORE_LABEL 0x0020
888#define IPV6_SADDR_SCORE_PRIVACY 0x0040
889
b6f99a21 890static inline int ipv6_saddr_preferred(int type)
1da177e4 891{
072047e4
YH		 892 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
893 IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
894 return 1;
895 return 0;
1da177e4
LT		 896}
897
072047e4 898int ipv6_dev_get_saddr(struct net_device *daddr_dev,
1da177e4
LT		 899 struct in6_addr *daddr, struct in6_addr *saddr)
900{
072047e4
YH		 901 struct ipv6_saddr_score hiscore;
902 struct inet6_ifaddr *ifa_result = NULL;
903 int daddr_type = __ipv6_addr_type(daddr);
904 int daddr_scope = __ipv6_addr_src_scope(daddr_type);
303065a8
YH		 905 int daddr_ifindex = daddr_dev ? daddr_dev->ifindex : 0;
906 u32 daddr_label = ipv6_addr_label(daddr, daddr_type, daddr_ifindex);
072047e4 907 struct net_device *dev;
1da177e4 908
072047e4 909 memset(&hiscore, 0, sizeof(hiscore));
1da177e4 910
072047e4 911 read_lock(&dev_base_lock);
8814c4b5 912 rcu_read_lock();
1da177e4 913
881d966b 914 for_each_netdev(&init_net, dev) {
072047e4
YH		 915 struct inet6_dev *idev;
916 struct inet6_ifaddr *ifa;
917
918 /* Rule 0: Candidate Source Address (section 4)
919 * - multicast and link-local destination address,
920 * the set of candidate source address MUST only
921 * include addresses assigned to interfaces
922 * belonging to the same link as the outgoing
923 * interface.
924 * (- For site-local destination addresses, the
925 * set of candidate source addresses MUST only
926 * include addresses assigned to interfaces
927 * belonging to the same site as the outgoing
928 * interface.)
929 */
930 if ((daddr_type & IPV6_ADDR_MULTICAST ||
931 daddr_scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
932 daddr_dev && dev != daddr_dev)
933 continue;
1da177e4 934
1da177e4 935 idev = __in6_dev_get(dev);
072047e4
YH		 936 if (!idev)
937 continue;
938
939 read_lock_bh(&idev->lock);
940 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
941 struct ipv6_saddr_score score;
942
943 score.addr_type = __ipv6_addr_type(&ifa->addr);
944
6b3ae80a
YH		 945 /* Rule 0:
946 * - Tentative Address (RFC2462 section 5.4)
947 * - A tentative address is not considered
948 * "assigned to an interface" in the traditional
95c385b4 949 * sense, unless it is also flagged as optimistic.
6b3ae80a 950 * - Candidate Source Address (section 4)
072047e4
YH		 951 * - In any case, anycast addresses, multicast
952 * addresses, and the unspecified address MUST
953 * NOT be included in a candidate set.
954 */
95c385b4
NH		 955 if ((ifa->flags & IFA_F_TENTATIVE) &&
956 (!(ifa->flags & IFA_F_OPTIMISTIC)))
6b3ae80a 957 continue;
072047e4
YH		 958 if (unlikely(score.addr_type == IPV6_ADDR_ANY ||
959 score.addr_type & IPV6_ADDR_MULTICAST)) {
960 LIMIT_NETDEBUG(KERN_DEBUG
3b6d821c 961 "ADDRCONF: unspecified / multicast address "
072047e4
YH		 962 "assigned as unicast address on %s",
963 dev->name);
964 continue;
965 }
966
967 score.attrs = 0;
968 score.matchlen = 0;
969 score.scope = 0;
970 score.rule = 0;
971
972 if (ifa_result == NULL) {
973 /* record it if the first available entry */
974 goto record_it;
975 }
976
977 /* Rule 1: Prefer same address */
978 if (hiscore.rule < 1) {
979 if (ipv6_addr_equal(&ifa_result->addr, daddr))
980 hiscore.attrs |= IPV6_SADDR_SCORE_LOCAL;
981 hiscore.rule++;
982 }
983 if (ipv6_addr_equal(&ifa->addr, daddr)) {
984 score.attrs |= IPV6_SADDR_SCORE_LOCAL;
985 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)) {
986 score.rule = 1;
987 goto record_it;
1da177e4 988 }
072047e4
YH		 989 } else {
990 if (hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)
991 continue;
1da177e4 992 }
1da177e4 993
072047e4
YH		 994 /* Rule 2: Prefer appropriate scope */
995 if (hiscore.rule < 2) {
996 hiscore.scope = __ipv6_addr_src_scope(hiscore.addr_type);
997 hiscore.rule++;
998 }
999 score.scope = __ipv6_addr_src_scope(score.addr_type);
1000 if (hiscore.scope < score.scope) {
1001 if (hiscore.scope < daddr_scope) {
1002 score.rule = 2;
1003 goto record_it;
1004 } else
1005 continue;
1006 } else if (score.scope < hiscore.scope) {
1007 if (score.scope < daddr_scope)
e55ffac6 1008 break; /* addresses sorted by scope */
072047e4
YH		 1009 else {
1010 score.rule = 2;
1011 goto record_it;
1012 }
1013 }
1da177e4 1014
95c385b4 1015 /* Rule 3: Avoid deprecated and optimistic addresses */
072047e4
YH		 1016 if (hiscore.rule < 3) {
1017 if (ipv6_saddr_preferred(hiscore.addr_type) ||
95c385b4
NH		 1018 (((ifa_result->flags &
1019 (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)) == 0)))
072047e4
YH		 1020 hiscore.attrs |= IPV6_SADDR_SCORE_PREFERRED;
1021 hiscore.rule++;
1022 }
1023 if (ipv6_saddr_preferred(score.addr_type) ||
6ae5f983 1024 (((ifa->flags &
95c385b4 1025 (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)) == 0))) {
072047e4
YH		 1026 score.attrs |= IPV6_SADDR_SCORE_PREFERRED;
1027 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)) {
1028 score.rule = 3;
1029 goto record_it;
1030 }
1031 } else {
1032 if (hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)
1033 continue;
1034 }
1da177e4 1035
3b9f9a1c 1036 /* Rule 4: Prefer home address */
59fbb3a6 1037#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3b9f9a1c
NT		 1038 if (hiscore.rule < 4) {
1039 if (ifa_result->flags & IFA_F_HOMEADDRESS)
1040 hiscore.attrs |= IPV6_SADDR_SCORE_HOA;
1041 hiscore.rule++;
1042 }
1043 if (ifa->flags & IFA_F_HOMEADDRESS) {
1044 score.attrs |= IPV6_SADDR_SCORE_HOA;
1045 if (!(ifa_result->flags & IFA_F_HOMEADDRESS)) {
1046 score.rule = 4;
1047 goto record_it;
1048 }
1049 } else {
1050 if (hiscore.attrs & IPV6_SADDR_SCORE_HOA)
1051 continue;
1052 }
1053#else
220bbd74
YH		 1054 if (hiscore.rule < 4)
1055 hiscore.rule++;
3b9f9a1c 1056#endif
072047e4
YH		 1057
1058 /* Rule 5: Prefer outgoing interface */
1059 if (hiscore.rule < 5) {
1060 if (daddr_dev == NULL ||
1061 daddr_dev == ifa_result->idev->dev)
1062 hiscore.attrs |= IPV6_SADDR_SCORE_OIF;
1063 hiscore.rule++;
1064 }
1065 if (daddr_dev == NULL ||
1066 daddr_dev == ifa->idev->dev) {
1067 score.attrs |= IPV6_SADDR_SCORE_OIF;
1068 if (!(hiscore.attrs & IPV6_SADDR_SCORE_OIF)) {
1069 score.rule = 5;
1070 goto record_it;
1071 }
1072 } else {
1073 if (hiscore.attrs & IPV6_SADDR_SCORE_OIF)
1074 continue;
1075 }
1076
1077 /* Rule 6: Prefer matching label */
1078 if (hiscore.rule < 6) {
c1ee656c 1079 if (ipv6_addr_label(&ifa_result->addr,
303065a8
YH		 1080 hiscore.addr_type,
1081 ifa_result->idev->dev->ifindex) == daddr_label)
072047e4
YH		 1082 hiscore.attrs |= IPV6_SADDR_SCORE_LABEL;
1083 hiscore.rule++;
1084 }
c1ee656c 1085 if (ipv6_addr_label(&ifa->addr,
303065a8
YH		 1086 score.addr_type,
1087 ifa->idev->dev->ifindex) == daddr_label) {
072047e4
YH		 1088 score.attrs |= IPV6_SADDR_SCORE_LABEL;
1089 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LABEL)) {
1090 score.rule = 6;
1091 goto record_it;
1da177e4 1092 }
072047e4
YH		 1093 } else {
1094 if (hiscore.attrs & IPV6_SADDR_SCORE_LABEL)
1095 continue;
1096 }
1097
44fd0261 1098#ifdef CONFIG_IPV6_PRIVACY
072047e4
YH		 1099 /* Rule 7: Prefer public address
1100 * Note: prefer temprary address if use_tempaddr >= 2
1101 */
1102 if (hiscore.rule < 7) {
1103 if ((!(ifa_result->flags & IFA_F_TEMPORARY)) ^
1104 (ifa_result->idev->cnf.use_tempaddr >= 2))
1105 hiscore.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1106 hiscore.rule++;
1107 }
1108 if ((!(ifa->flags & IFA_F_TEMPORARY)) ^
1109 (ifa->idev->cnf.use_tempaddr >= 2)) {
1110 score.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1111 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)) {
1112 score.rule = 7;
1113 goto record_it;
1114 }
1115 } else {
1116 if (hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)
1117 continue;
1118 }
5e2707fa
YH		 1119#else
1120 if (hiscore.rule < 7)
1121 hiscore.rule++;
44fd0261 1122#endif
072047e4 1123 /* Rule 8: Use longest matching prefix */
12da2a43 1124 if (hiscore.rule < 8) {
072047e4 1125 hiscore.matchlen = ipv6_addr_diff(&ifa_result->addr, daddr);
12da2a43
YZ		 1126 hiscore.rule++;
1127 }
072047e4
YH		 1128 score.matchlen = ipv6_addr_diff(&ifa->addr, daddr);
1129 if (score.matchlen > hiscore.matchlen) {
1130 score.rule = 8;
1131 goto record_it;
1da177e4 1132 }
072047e4
YH		 1133#if 0
1134 else if (score.matchlen < hiscore.matchlen)
1135 continue;
1136#endif
1137
1138 /* Final Rule: choose first available one */
1139 continue;
1140record_it:
1141 if (ifa_result)
1142 in6_ifa_put(ifa_result);
1143 in6_ifa_hold(ifa);
1144 ifa_result = ifa;
1145 hiscore = score;
1da177e4 1146 }
072047e4 1147 read_unlock_bh(&idev->lock);
1da177e4 1148 }
8814c4b5 1149 rcu_read_unlock();
1da177e4
LT		 1150 read_unlock(&dev_base_lock);
1151
072047e4
YH		 1152 if (!ifa_result)
1153 return -EADDRNOTAVAIL;
1ab1457c 1154
072047e4
YH		 1155 ipv6_addr_copy(saddr, &ifa_result->addr);
1156 in6_ifa_put(ifa_result);
1157 return 0;
1da177e4
LT		 1158}
1159
1160
1161int ipv6_get_saddr(struct dst_entry *dst,
1162 struct in6_addr *daddr, struct in6_addr *saddr)
1163{
7a3025b1 1164 return ipv6_dev_get_saddr(dst ? ip6_dst_idev(dst)->dev : NULL, daddr, saddr);
1da177e4
LT		 1165}
1166
7159039a 1167EXPORT_SYMBOL(ipv6_get_saddr);
1da177e4 1168
95c385b4
NH		 1169int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1170 unsigned char banned_flags)
1da177e4
LT		 1171{
1172 struct inet6_dev *idev;
1173 int err = -EADDRNOTAVAIL;
1174
8814c4b5 1175 rcu_read_lock();
1da177e4
LT		 1176 if ((idev = __in6_dev_get(dev)) != NULL) {
1177 struct inet6_ifaddr *ifp;
1178
1179 read_lock_bh(&idev->lock);
1180 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
95c385b4 1181 if (ifp->scope == IFA_LINK && !(ifp->flags & banned_flags)) {
1da177e4
LT		 1182 ipv6_addr_copy(addr, &ifp->addr);
1183 err = 0;
1184 break;
1185 }
1186 }
1187 read_unlock_bh(&idev->lock);
1188 }
8814c4b5 1189 rcu_read_unlock();
1da177e4
LT		 1190 return err;
1191}
1192
1193static int ipv6_count_addresses(struct inet6_dev *idev)
1194{
1195 int cnt = 0;
1196 struct inet6_ifaddr *ifp;
1197
1198 read_lock_bh(&idev->lock);
1199 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1200 cnt++;
1201 read_unlock_bh(&idev->lock);
1202 return cnt;
1203}
1204
1205int ipv6_chk_addr(struct in6_addr *addr, struct net_device *dev, int strict)
1206{
1207 struct inet6_ifaddr * ifp;
1208 u8 hash = ipv6_addr_hash(addr);
1209
1210 read_lock_bh(&addrconf_hash_lock);
1211 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1212 if (ipv6_addr_equal(&ifp->addr, addr) &&
1213 !(ifp->flags&IFA_F_TENTATIVE)) {
1214 if (dev == NULL || ifp->idev->dev == dev ||
1215 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1216 break;
1217 }
1218 }
1219 read_unlock_bh(&addrconf_hash_lock);
1220 return ifp != NULL;
1221}
1222
7159039a
YH		 1223EXPORT_SYMBOL(ipv6_chk_addr);
1224
1da177e4
LT		 1225static
1226int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev)
1227{
1228 struct inet6_ifaddr * ifp;
1229 u8 hash = ipv6_addr_hash(addr);
1230
1231 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1232 if (ipv6_addr_equal(&ifp->addr, addr)) {
1233 if (dev == NULL || ifp->idev->dev == dev)
1234 break;
1235 }
1236 }
1237 return ifp != NULL;
1238}
1239
1240struct inet6_ifaddr * ipv6_get_ifaddr(struct in6_addr *addr, struct net_device *dev, int strict)
1241{
1242 struct inet6_ifaddr * ifp;
1243 u8 hash = ipv6_addr_hash(addr);
1244
1245 read_lock_bh(&addrconf_hash_lock);
1246 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1247 if (ipv6_addr_equal(&ifp->addr, addr)) {
1248 if (dev == NULL || ifp->idev->dev == dev ||
1249 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1250 in6_ifa_hold(ifp);
1251 break;
1252 }
1253 }
1254 }
1255 read_unlock_bh(&addrconf_hash_lock);
1256
1257 return ifp;
1258}
1259
1260int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1261{
1262 const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
0fa1a53e 1263 const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
82103232
AV		 1264 __be32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
1265 __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1da177e4 1266 int sk_ipv6only = ipv6_only_sock(sk);
463c84b9 1267 int sk2_ipv6only = inet_v6_ipv6only(sk2);
1da177e4
LT		 1268 int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1269 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1270
1271 if (!sk2_rcv_saddr && !sk_ipv6only)
1272 return 1;
1273
1274 if (addr_type2 == IPV6_ADDR_ANY &&
1275 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1276 return 1;
1277
1278 if (addr_type == IPV6_ADDR_ANY &&
1279 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1280 return 1;
1281
1282 if (sk2_rcv_saddr6 &&
1283 ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1284 return 1;
1285
1286 if (addr_type == IPV6_ADDR_MAPPED &&
1287 !sk2_ipv6only &&
1288 (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1289 return 1;
1290
1291 return 0;
1292}
1293
1294/* Gets referenced address, destroys ifaddr */
1295
9f5336e2 1296static void addrconf_dad_stop(struct inet6_ifaddr *ifp)
1da177e4 1297{
1da177e4
LT		 1298 if (ifp->flags&IFA_F_PERMANENT) {
1299 spin_lock_bh(&ifp->lock);
1300 addrconf_del_timer(ifp);
1301 ifp->flags |= IFA_F_TENTATIVE;
1302 spin_unlock_bh(&ifp->lock);
1303 in6_ifa_put(ifp);
1304#ifdef CONFIG_IPV6_PRIVACY
1305 } else if (ifp->flags&IFA_F_TEMPORARY) {
1306 struct inet6_ifaddr *ifpub;
1307 spin_lock_bh(&ifp->lock);
1308 ifpub = ifp->ifpub;
1309 if (ifpub) {
1310 in6_ifa_hold(ifpub);
1311 spin_unlock_bh(&ifp->lock);
1312 ipv6_create_tempaddr(ifpub, ifp);
1313 in6_ifa_put(ifpub);
1314 } else {
1315 spin_unlock_bh(&ifp->lock);
1316 }
1317 ipv6_del_addr(ifp);
1318#endif
1319 } else
1320 ipv6_del_addr(ifp);
1321}
1322
3c21edbd
YH		 1323void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1324{
1325 if (net_ratelimit())
1326 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1327 addrconf_dad_stop(ifp);
1328}
1da177e4
LT		 1329
1330/* Join to solicited addr multicast group. */
1331
1332void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1333{
1334 struct in6_addr maddr;
1335
1336 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1337 return;
1338
1339 addrconf_addr_solict_mult(addr, &maddr);
1340 ipv6_dev_mc_inc(dev, &maddr);
1341}
1342
1343void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1344{
1345 struct in6_addr maddr;
1346
1347 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1348 return;
1349
1350 addrconf_addr_solict_mult(addr, &maddr);
1351 __ipv6_dev_mc_dec(idev, &maddr);
1352}
1353
20380731 1354static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1355{
1356 struct in6_addr addr;
1357 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1358 if (ipv6_addr_any(&addr))
1359 return;
1360 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1361}
1362
20380731 1363static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1364{
1365 struct in6_addr addr;
1366 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1367 if (ipv6_addr_any(&addr))
1368 return;
1369 __ipv6_dev_ac_dec(ifp->idev, &addr);
1370}
1371
073a8e0e
YH		 1372static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1373{
1374 if (dev->addr_len != ETH_ALEN)
1375 return -1;
1376 memcpy(eui, dev->dev_addr, 3);
1377 memcpy(eui + 5, dev->dev_addr + 3, 3);
1378
1379 /*
1380 * The zSeries OSA network cards can be shared among various
1381 * OS instances, but the OSA cards have only one MAC address.
1382 * This leads to duplicate address conflicts in conjunction
1383 * with IPv6 if more than one instance uses the same card.
1384 *
1385 * The driver for these cards can deliver a unique 16-bit
1386 * identifier for each instance sharing the same card. It is
1387 * placed instead of 0xFFFE in the interface identifier. The
1388 * "u" bit of the interface identifier is not inverted in this
1389 * case. Hence the resulting interface identifier has local
1390 * scope according to RFC2373.
1391 */
1392 if (dev->dev_id) {
1393 eui[3] = (dev->dev_id >> 8) & 0xFF;
1394 eui[4] = dev->dev_id & 0xFF;
1395 } else {
1396 eui[3] = 0xFF;
1397 eui[4] = 0xFE;
1398 eui[0] ^= 2;
1399 }
1400 return 0;
1401}
1402
1403static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1404{
1405 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1406 if (dev->addr_len != ARCNET_ALEN)
1407 return -1;
1408 memset(eui, 0, 7);
1409 eui[7] = *(u8*)dev->dev_addr;
1410 return 0;
1411}
1412
1413static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1414{
1415 if (dev->addr_len != INFINIBAND_ALEN)
1416 return -1;
1417 memcpy(eui, dev->dev_addr + 12, 8);
1418 eui[0] |= 2;
1419 return 0;
1420}
1421
1da177e4
LT		 1422static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1423{
1424 switch (dev->type) {
1425 case ARPHRD_ETHER:
1426 case ARPHRD_FDDI:
1427 case ARPHRD_IEEE802_TR:
073a8e0e 1428 return addrconf_ifid_eui48(eui, dev);
1da177e4 1429 case ARPHRD_ARCNET:
073a8e0e 1430 return addrconf_ifid_arcnet(eui, dev);
1da177e4 1431 case ARPHRD_INFINIBAND:
073a8e0e 1432 return addrconf_ifid_infiniband(eui, dev);
c7dc89c0
FT		 1433 case ARPHRD_SIT:
1434 if (dev->priv_flags & IFF_ISATAP)
1435 return ipv6_isatap_eui64(eui, *(__be32 *)dev->dev_addr);
1da177e4
LT		 1436 }
1437 return -1;
1438}
1439
1440static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1441{
1442 int err = -1;
1443 struct inet6_ifaddr *ifp;
1444
1445 read_lock_bh(&idev->lock);
1446 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1447 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1448 memcpy(eui, ifp->addr.s6_addr+8, 8);
1449 err = 0;
1450 break;
1451 }
1452 }
1453 read_unlock_bh(&idev->lock);
1454 return err;
1455}
1456
1457#ifdef CONFIG_IPV6_PRIVACY
1458/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1459static int __ipv6_regen_rndid(struct inet6_dev *idev)
1460{
1da177e4 1461regen:
955189ef 1462 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1da177e4 1463 idev->rndid[0] &= ~0x02;
1da177e4
LT		 1464
1465 /*
1466 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1467 * check if generated address is not inappropriate
1468 *
1469 * - Reserved subnet anycast (RFC 2526)
1470 * 11111101 11....11 1xxxxxxx
c7dc89c0 1471 * - ISATAP (RFC4214) 6.1
1da177e4
LT		 1472 * 00-00-5E-FE-xx-xx-xx-xx
1473 * - value 0
1474 * - XXX: already assigned to an address on the device
1475 */
1ab1457c 1476 if (idev->rndid[0] == 0xfd &&
1da177e4
LT		 1477 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1478 (idev->rndid[7]&0x80))
1479 goto regen;
1480 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1481 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1482 goto regen;
1483 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1484 goto regen;
1485 }
1486
1487 return 0;
1488}
1489
1490static void ipv6_regen_rndid(unsigned long data)
1491{
1492 struct inet6_dev *idev = (struct inet6_dev *) data;
1493 unsigned long expires;
1494
8814c4b5 1495 rcu_read_lock_bh();
1da177e4
LT		 1496 write_lock_bh(&idev->lock);
1497
1498 if (idev->dead)
1499 goto out;
1500
1501 if (__ipv6_regen_rndid(idev) < 0)
1502 goto out;
1ab1457c 1503
1da177e4 1504 expires = jiffies +
1ab1457c 1505 idev->cnf.temp_prefered_lft * HZ -
1da177e4
LT		 1506 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1507 if (time_before(expires, jiffies)) {
1508 printk(KERN_WARNING
1509 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1510 idev->dev->name);
1511 goto out;
1512 }
1513
1514 if (!mod_timer(&idev->regen_timer, expires))
1515 in6_dev_hold(idev);
1516
1517out:
1518 write_unlock_bh(&idev->lock);
8814c4b5 1519 rcu_read_unlock_bh();
1da177e4
LT		 1520 in6_dev_put(idev);
1521}
1522
1523static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1524 int ret = 0;
1525
1526 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1527 ret = __ipv6_regen_rndid(idev);
1528 return ret;
1529}
1530#endif
1531
1532/*
1533 * Add prefix route.
1534 */
1535
1536static void
1537addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
e431b8c0 1538 unsigned long expires, u32 flags)
1da177e4 1539{
86872cb5
TG		 1540 struct fib6_config cfg = {
1541 .fc_table = RT6_TABLE_PREFIX,
1542 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1543 .fc_ifindex = dev->ifindex,
1544 .fc_expires = expires,
1545 .fc_dst_len = plen,
1546 .fc_flags = RTF_UP | flags,
1547 };
1da177e4 1548
86872cb5 1549 ipv6_addr_copy(&cfg.fc_dst, pfx);
1da177e4
LT		 1550
1551 /* Prevent useless cloning on PtP SIT.
1552 This thing is done here expecting that the whole
1553 class of non-broadcast devices need not cloning.
1554 */
0be669bb 1555#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
86872cb5
TG		 1556 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1557 cfg.fc_flags |= RTF_NONEXTHOP;
0be669bb 1558#endif
1da177e4 1559
86872cb5 1560 ip6_route_add(&cfg);
1da177e4
LT		 1561}
1562
1563/* Create "default" multicast route to the interface */
1564
1565static void addrconf_add_mroute(struct net_device *dev)
1566{
86872cb5
TG		 1567 struct fib6_config cfg = {
1568 .fc_table = RT6_TABLE_LOCAL,
1569 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1570 .fc_ifindex = dev->ifindex,
1571 .fc_dst_len = 8,
1572 .fc_flags = RTF_UP,
1573 };
1574
1575 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1576
1577 ip6_route_add(&cfg);
1da177e4
LT		 1578}
1579
0be669bb 1580#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 1581static void sit_route_add(struct net_device *dev)
1582{
86872cb5
TG		 1583 struct fib6_config cfg = {
1584 .fc_table = RT6_TABLE_MAIN,
1585 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1586 .fc_ifindex = dev->ifindex,
1587 .fc_dst_len = 96,
1588 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1589 };
1da177e4
LT		 1590
1591 /* prefix length - 96 bits "::d.d.d.d" */
86872cb5 1592 ip6_route_add(&cfg);
1da177e4 1593}
0be669bb 1594#endif
1da177e4
LT		 1595
1596static void addrconf_add_lroute(struct net_device *dev)
1597{
1598 struct in6_addr addr;
1599
1600 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1601 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1602}
1603
1604static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1605{
1606 struct inet6_dev *idev;
1607
1608 ASSERT_RTNL();
1609
1610 if ((idev = ipv6_find_idev(dev)) == NULL)
1611 return NULL;
1612
1613 /* Add default multicast route */
1614 addrconf_add_mroute(dev);
1615
1616 /* Add link local route */
1617 addrconf_add_lroute(dev);
1618 return idev;
1619}
1620
1621void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1622{
1623 struct prefix_info *pinfo;
1624 __u32 valid_lft;
1625 __u32 prefered_lft;
1626 int addr_type;
1627 unsigned long rt_expires;
1628 struct inet6_dev *in6_dev;
1629
1630 pinfo = (struct prefix_info *) opt;
1ab1457c 1631
1da177e4
LT		 1632 if (len < sizeof(struct prefix_info)) {
1633 ADBG(("addrconf: prefix option too short\n"));
1634 return;
1635 }
1ab1457c 1636
1da177e4
LT		 1637 /*
1638 * Validation checks ([ADDRCONF], page 19)
1639 */
1640
1641 addr_type = ipv6_addr_type(&pinfo->prefix);
1642
1643 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1644 return;
1645
1646 valid_lft = ntohl(pinfo->valid);
1647 prefered_lft = ntohl(pinfo->prefered);
1648
1649 if (prefered_lft > valid_lft) {
1650 if (net_ratelimit())
1651 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1652 return;
1653 }
1654
1655 in6_dev = in6_dev_get(dev);
1656
1657 if (in6_dev == NULL) {
1658 if (net_ratelimit())
1659 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1660 return;
1661 }
1662
1663 /*
1664 * Two things going on here:
1665 * 1) Add routes for on-link prefixes
1666 * 2) Configure prefixes with the auto flag set
1667 */
1668
1669 /* Avoid arithmetic overflow. Really, we could
1670 save rt_expires in seconds, likely valid_lft,
1671 but it would require division in fib gc, that it
1672 not good.
1673 */
1674 if (valid_lft >= 0x7FFFFFFF/HZ)
3dd4bc68 1675 rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ);
1da177e4 1676 else
3dd4bc68
YH		 1677 rt_expires = valid_lft * HZ;
1678
1679 /*
1680 * We convert this (in jiffies) to clock_t later.
1681 * Avoid arithmetic overflow there as well.
1682 * Overflow can happen only if HZ < USER_HZ.
1683 */
1684 if (HZ < USER_HZ && rt_expires > 0x7FFFFFFF / USER_HZ)
1685 rt_expires = 0x7FFFFFFF / USER_HZ;
1da177e4
LT		 1686
1687 if (pinfo->onlink) {
1688 struct rt6_info *rt;
1689 rt = rt6_lookup(&pinfo->prefix, NULL, dev->ifindex, 1);
1690
1691 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
1692 if (rt->rt6i_flags&RTF_EXPIRES) {
1693 if (valid_lft == 0) {
e0a1ad73 1694 ip6_del_rt(rt);
1da177e4
LT		 1695 rt = NULL;
1696 } else {
3dd4bc68 1697 rt->rt6i_expires = jiffies + rt_expires;
1da177e4
LT		 1698 }
1699 }
1700 } else if (valid_lft) {
1701 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
3dd4bc68 1702 dev, jiffies_to_clock_t(rt_expires), RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT);
1da177e4
LT		 1703 }
1704 if (rt)
1705 dst_release(&rt->u.dst);
1706 }
1707
1708 /* Try to figure out our local address for this prefix */
1709
1710 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1711 struct inet6_ifaddr * ifp;
1712 struct in6_addr addr;
1713 int create = 0, update_lft = 0;
1714
1715 if (pinfo->prefix_len == 64) {
1716 memcpy(&addr, &pinfo->prefix, 8);
1717 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1718 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1719 in6_dev_put(in6_dev);
1720 return;
1721 }
1722 goto ok;
1723 }
1724 if (net_ratelimit())
1725 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1726 pinfo->prefix_len);
1727 in6_dev_put(in6_dev);
1728 return;
1729
1730ok:
1731
1732 ifp = ipv6_get_ifaddr(&addr, dev, 1);
1733
1734 if (ifp == NULL && valid_lft) {
1735 int max_addresses = in6_dev->cnf.max_addresses;
95c385b4
NH		 1736 u32 addr_flags = 0;
1737
1738#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1739 if (in6_dev->cnf.optimistic_dad &&
1740 !ipv6_devconf.forwarding)
1741 addr_flags = IFA_F_OPTIMISTIC;
1742#endif
1da177e4
LT		 1743
1744 /* Do not allow to create too much of autoconfigured
1745 * addresses; this would be too easy way to crash kernel.
1746 */
1747 if (!max_addresses ||
1748 ipv6_count_addresses(in6_dev) < max_addresses)
1749 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
95c385b4
NH		 1750 addr_type&IPV6_ADDR_SCOPE_MASK,
1751 addr_flags);
1da177e4
LT		 1752
1753 if (!ifp || IS_ERR(ifp)) {
1754 in6_dev_put(in6_dev);
1755 return;
1756 }
1757
1758 update_lft = create = 1;
1759 ifp->cstamp = jiffies;
1760 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1761 }
1762
1763 if (ifp) {
1764 int flags;
1765 unsigned long now;
1766#ifdef CONFIG_IPV6_PRIVACY
1767 struct inet6_ifaddr *ift;
1768#endif
1769 u32 stored_lft;
1770
1771 /* update lifetime (RFC2462 5.5.3 e) */
1772 spin_lock(&ifp->lock);
1773 now = jiffies;
1774 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1775 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1776 else
1777 stored_lft = 0;
1778 if (!update_lft && stored_lft) {
1779 if (valid_lft > MIN_VALID_LIFETIME ||
1780 valid_lft > stored_lft)
1781 update_lft = 1;
1782 else if (stored_lft <= MIN_VALID_LIFETIME) {
1783 /* valid_lft <= stored_lft is always true */
1784 /* XXX: IPsec */
1785 update_lft = 0;
1786 } else {
1787 valid_lft = MIN_VALID_LIFETIME;
1788 if (valid_lft < prefered_lft)
1789 prefered_lft = valid_lft;
1790 update_lft = 1;
1791 }
1792 }
1793
1794 if (update_lft) {
1795 ifp->valid_lft = valid_lft;
1796 ifp->prefered_lft = prefered_lft;
1797 ifp->tstamp = now;
1798 flags = ifp->flags;
1799 ifp->flags &= ~IFA_F_DEPRECATED;
1800 spin_unlock(&ifp->lock);
1801
1802 if (!(flags&IFA_F_TENTATIVE))
1803 ipv6_ifa_notify(0, ifp);
1804 } else
1805 spin_unlock(&ifp->lock);
1806
1807#ifdef CONFIG_IPV6_PRIVACY
1808 read_lock_bh(&in6_dev->lock);
1809 /* update all temporary addresses in the list */
1810 for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1811 /*
1812 * When adjusting the lifetimes of an existing
1813 * temporary address, only lower the lifetimes.
1814 * Implementations must not increase the
1815 * lifetimes of an existing temporary address
1816 * when processing a Prefix Information Option.
1817 */
1818 spin_lock(&ift->lock);
1819 flags = ift->flags;
1820 if (ift->valid_lft > valid_lft &&
1821 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1822 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1823 if (ift->prefered_lft > prefered_lft &&
1824 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1825 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1826 spin_unlock(&ift->lock);
1827 if (!(flags&IFA_F_TENTATIVE))
1828 ipv6_ifa_notify(0, ift);
1829 }
1830
1831 if (create && in6_dev->cnf.use_tempaddr > 0) {
1832 /*
1833 * When a new public address is created as described in [ADDRCONF],
1834 * also create a new temporary address.
1835 */
1ab1457c 1836 read_unlock_bh(&in6_dev->lock);
1da177e4
LT		 1837 ipv6_create_tempaddr(ifp, NULL);
1838 } else {
1839 read_unlock_bh(&in6_dev->lock);
1840 }
1841#endif
1842 in6_ifa_put(ifp);
1843 addrconf_verify(0);
1844 }
1845 }
1846 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
1847 in6_dev_put(in6_dev);
1848}
1849
1850/*
1851 * Set destination address.
1852 * Special case for SIT interfaces where we create a new "virtual"
1853 * device.
1854 */
1855int addrconf_set_dstaddr(void __user *arg)
1856{
1857 struct in6_ifreq ireq;
1858 struct net_device *dev;
1859 int err = -EINVAL;
1860
1861 rtnl_lock();
1862
1863 err = -EFAULT;
1864 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1865 goto err_exit;
1866
881d966b 1867 dev = __dev_get_by_index(&init_net, ireq.ifr6_ifindex);
1da177e4
LT		 1868
1869 err = -ENODEV;
1870 if (dev == NULL)
1871 goto err_exit;
1872
0be669bb 1873#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 1874 if (dev->type == ARPHRD_SIT) {
1875 struct ifreq ifr;
1876 mm_segment_t oldfs;
1877 struct ip_tunnel_parm p;
1878
1879 err = -EADDRNOTAVAIL;
1880 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
1881 goto err_exit;
1882
1883 memset(&p, 0, sizeof(p));
1884 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
1885 p.iph.saddr = 0;
1886 p.iph.version = 4;
1887 p.iph.ihl = 5;
1888 p.iph.protocol = IPPROTO_IPV6;
1889 p.iph.ttl = 64;
1890 ifr.ifr_ifru.ifru_data = (void __user *)&p;
1891
1892 oldfs = get_fs(); set_fs(KERNEL_DS);
1893 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
1894 set_fs(oldfs);
1895
1896 if (err == 0) {
1897 err = -ENOBUFS;
881d966b 1898 if ((dev = __dev_get_by_name(&init_net, p.name)) == NULL)
1da177e4
LT		 1899 goto err_exit;
1900 err = dev_open(dev);
1901 }
1902 }
0be669bb 1903#endif
1da177e4
LT		 1904
1905err_exit:
1906 rtnl_unlock();
1907 return err;
1908}
1909
1910/*
1911 * Manual configuration of address on an interface
1912 */
0778769d 1913static int inet6_addr_add(int ifindex, struct in6_addr *pfx, int plen,
55ebaef1 1914 __u8 ifa_flags, __u32 prefered_lft, __u32 valid_lft)
1da177e4
LT		 1915{
1916 struct inet6_ifaddr *ifp;
1917 struct inet6_dev *idev;
1918 struct net_device *dev;
1919 int scope;
46d48046 1920 u32 flags = RTF_EXPIRES;
1da177e4
LT		 1921
1922 ASSERT_RTNL();
1ab1457c 1923
0778769d
NT		 1924 /* check the lifetime */
1925 if (!valid_lft || prefered_lft > valid_lft)
1926 return -EINVAL;
1927
881d966b 1928 if ((dev = __dev_get_by_index(&init_net, ifindex)) == NULL)
1da177e4 1929 return -ENODEV;
1ab1457c 1930
1da177e4
LT		 1931 if ((idev = addrconf_add_dev(dev)) == NULL)
1932 return -ENOBUFS;
1933
1934 scope = ipv6_addr_scope(pfx);
1935
46d48046 1936 if (valid_lft == INFINITY_LIFE_TIME) {
0778769d 1937 ifa_flags |= IFA_F_PERMANENT;
46d48046
YH		 1938 flags = 0;
1939 } else if (valid_lft >= 0x7FFFFFFF/HZ)
0778769d
NT		 1940 valid_lft = 0x7FFFFFFF/HZ;
1941
1942 if (prefered_lft == 0)
1943 ifa_flags |= IFA_F_DEPRECATED;
1944 else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
1945 (prefered_lft != INFINITY_LIFE_TIME))
1946 prefered_lft = 0x7FFFFFFF/HZ;
1947
1948 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
1949
1da177e4 1950 if (!IS_ERR(ifp)) {
06aebfb7 1951 spin_lock_bh(&ifp->lock);
0778769d
NT		 1952 ifp->valid_lft = valid_lft;
1953 ifp->prefered_lft = prefered_lft;
1954 ifp->tstamp = jiffies;
06aebfb7 1955 spin_unlock_bh(&ifp->lock);
0778769d 1956
46d48046
YH		 1957 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
1958 jiffies_to_clock_t(valid_lft * HZ), flags);
95c385b4
NH		 1959 /*
1960 * Note that section 3.1 of RFC 4429 indicates
1961 * that the Optimistic flag should not be set for
1962 * manually configured addresses
1963 */
1da177e4
LT		 1964 addrconf_dad_start(ifp, 0);
1965 in6_ifa_put(ifp);
0778769d 1966 addrconf_verify(0);
1da177e4
LT		 1967 return 0;
1968 }
1969
1970 return PTR_ERR(ifp);
1971}
1972
1973static int inet6_addr_del(int ifindex, struct in6_addr *pfx, int plen)
1974{
1975 struct inet6_ifaddr *ifp;
1976 struct inet6_dev *idev;
1977 struct net_device *dev;
1ab1457c 1978
881d966b 1979 if ((dev = __dev_get_by_index(&init_net, ifindex)) == NULL)
1da177e4
LT		 1980 return -ENODEV;
1981
1982 if ((idev = __in6_dev_get(dev)) == NULL)
1983 return -ENXIO;
1984
1985 read_lock_bh(&idev->lock);
1986 for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
1987 if (ifp->prefix_len == plen &&
1988 ipv6_addr_equal(pfx, &ifp->addr)) {
1989 in6_ifa_hold(ifp);
1990 read_unlock_bh(&idev->lock);
1ab1457c 1991
1da177e4
LT		 1992 ipv6_del_addr(ifp);
1993
1994 /* If the last address is deleted administratively,
1995 disable IPv6 on this interface.
1996 */
1997 if (idev->addr_list == NULL)
1998 addrconf_ifdown(idev->dev, 1);
1999 return 0;
2000 }
2001 }
2002 read_unlock_bh(&idev->lock);
2003 return -EADDRNOTAVAIL;
2004}
2005
2006
2007int addrconf_add_ifaddr(void __user *arg)
2008{
2009 struct in6_ifreq ireq;
2010 int err;
1ab1457c 2011
1da177e4
LT		 2012 if (!capable(CAP_NET_ADMIN))
2013 return -EPERM;
1ab1457c 2014
1da177e4
LT		 2015 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2016 return -EFAULT;
2017
2018 rtnl_lock();
0778769d 2019 err = inet6_addr_add(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen,
55ebaef1 2020 IFA_F_PERMANENT, INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4
LT		 2021 rtnl_unlock();
2022 return err;
2023}
2024
2025int addrconf_del_ifaddr(void __user *arg)
2026{
2027 struct in6_ifreq ireq;
2028 int err;
1ab1457c 2029
1da177e4
LT		 2030 if (!capable(CAP_NET_ADMIN))
2031 return -EPERM;
2032
2033 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2034 return -EFAULT;
2035
2036 rtnl_lock();
2037 err = inet6_addr_del(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
2038 rtnl_unlock();
2039 return err;
2040}
2041
0be669bb 2042#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2043static void sit_add_v4_addrs(struct inet6_dev *idev)
2044{
2045 struct inet6_ifaddr * ifp;
2046 struct in6_addr addr;
2047 struct net_device *dev;
2048 int scope;
2049
2050 ASSERT_RTNL();
2051
2052 memset(&addr, 0, sizeof(struct in6_addr));
2053 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2054
2055 if (idev->dev->flags&IFF_POINTOPOINT) {
2056 addr.s6_addr32[0] = htonl(0xfe800000);
2057 scope = IFA_LINK;
2058 } else {
2059 scope = IPV6_ADDR_COMPATv4;
2060 }
2061
2062 if (addr.s6_addr32[3]) {
2063 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
2064 if (!IS_ERR(ifp)) {
2065 spin_lock_bh(&ifp->lock);
2066 ifp->flags &= ~IFA_F_TENTATIVE;
2067 spin_unlock_bh(&ifp->lock);
2068 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2069 in6_ifa_put(ifp);
2070 }
2071 return;
2072 }
2073
881d966b 2074 for_each_netdev(&init_net, dev) {
e5ed6399 2075 struct in_device * in_dev = __in_dev_get_rtnl(dev);
1da177e4
LT		 2076 if (in_dev && (dev->flags & IFF_UP)) {
2077 struct in_ifaddr * ifa;
2078
2079 int flag = scope;
2080
2081 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2082 int plen;
2083
2084 addr.s6_addr32[3] = ifa->ifa_local;
2085
2086 if (ifa->ifa_scope == RT_SCOPE_LINK)
2087 continue;
2088 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2089 if (idev->dev->flags&IFF_POINTOPOINT)
2090 continue;
2091 flag |= IFA_HOST;
2092 }
2093 if (idev->dev->flags&IFF_POINTOPOINT)
2094 plen = 64;
2095 else
2096 plen = 96;
2097
2098 ifp = ipv6_add_addr(idev, &addr, plen, flag,
2099 IFA_F_PERMANENT);
2100 if (!IS_ERR(ifp)) {
2101 spin_lock_bh(&ifp->lock);
2102 ifp->flags &= ~IFA_F_TENTATIVE;
2103 spin_unlock_bh(&ifp->lock);
2104 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2105 in6_ifa_put(ifp);
2106 }
2107 }
2108 }
1ab1457c 2109 }
1da177e4 2110}
0be669bb 2111#endif
1da177e4
LT		 2112
2113static void init_loopback(struct net_device *dev)
2114{
2115 struct inet6_dev *idev;
2116 struct inet6_ifaddr * ifp;
2117
2118 /* ::1 */
2119
2120 ASSERT_RTNL();
2121
2122 if ((idev = ipv6_find_idev(dev)) == NULL) {
2123 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2124 return;
2125 }
2126
2127 ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
2128 if (!IS_ERR(ifp)) {
2129 spin_lock_bh(&ifp->lock);
2130 ifp->flags &= ~IFA_F_TENTATIVE;
2131 spin_unlock_bh(&ifp->lock);
2132 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2133 in6_ifa_put(ifp);
2134 }
2135}
2136
2137static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2138{
2139 struct inet6_ifaddr * ifp;
95c385b4
NH		 2140 u32 addr_flags = IFA_F_PERMANENT;
2141
2142#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2143 if (idev->cnf.optimistic_dad &&
2144 !ipv6_devconf.forwarding)
2145 addr_flags |= IFA_F_OPTIMISTIC;
2146#endif
1da177e4 2147
95c385b4
NH		 2148
2149 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
1da177e4 2150 if (!IS_ERR(ifp)) {
46d48046 2151 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
1da177e4
LT		 2152 addrconf_dad_start(ifp, 0);
2153 in6_ifa_put(ifp);
2154 }
2155}
2156
2157static void addrconf_dev_config(struct net_device *dev)
2158{
2159 struct in6_addr addr;
2160 struct inet6_dev * idev;
2161
2162 ASSERT_RTNL();
2163
74235a25
HX		 2164 if ((dev->type != ARPHRD_ETHER) &&
2165 (dev->type != ARPHRD_FDDI) &&
2166 (dev->type != ARPHRD_IEEE802_TR) &&
2167 (dev->type != ARPHRD_ARCNET) &&
2168 (dev->type != ARPHRD_INFINIBAND)) {
2169 /* Alas, we support only Ethernet autoconfiguration. */
2170 return;
2171 }
2172
1da177e4
LT		 2173 idev = addrconf_add_dev(dev);
2174 if (idev == NULL)
2175 return;
2176
2177 memset(&addr, 0, sizeof(struct in6_addr));
2178 addr.s6_addr32[0] = htonl(0xFE800000);
2179
2180 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2181 addrconf_add_linklocal(idev, &addr);
2182}
2183
0be669bb 2184#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2185static void addrconf_sit_config(struct net_device *dev)
2186{
2187 struct inet6_dev *idev;
2188
2189 ASSERT_RTNL();
2190
1ab1457c
YH		 2191 /*
2192 * Configure the tunnel with one of our IPv4
2193 * addresses... we should configure all of
1da177e4
LT		 2194 * our v4 addrs in the tunnel
2195 */
2196
2197 if ((idev = ipv6_find_idev(dev)) == NULL) {
2198 printk(KERN_DEBUG "init sit: add_dev failed\n");
2199 return;
2200 }
2201
c7dc89c0
FT		 2202 if (dev->priv_flags & IFF_ISATAP) {
2203 struct in6_addr addr;
2204
2205 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2206 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2207 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2208 addrconf_add_linklocal(idev, &addr);
2209 return;
2210 }
2211
1da177e4
LT		 2212 sit_add_v4_addrs(idev);
2213
2214 if (dev->flags&IFF_POINTOPOINT) {
2215 addrconf_add_mroute(dev);
2216 addrconf_add_lroute(dev);
2217 } else
2218 sit_route_add(dev);
2219}
0be669bb 2220#endif
1da177e4
LT		 2221
2222static inline int
2223ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2224{
2225 struct in6_addr lladdr;
2226
95c385b4 2227 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
1da177e4
LT		 2228 addrconf_add_linklocal(idev, &lladdr);
2229 return 0;
2230 }
2231 return -1;
2232}
2233
2234static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2235{
2236 struct net_device *link_dev;
2237
2238 /* first try to inherit the link-local address from the link device */
2239 if (idev->dev->iflink &&
881d966b 2240 (link_dev = __dev_get_by_index(&init_net, idev->dev->iflink))) {
1da177e4
LT		 2241 if (!ipv6_inherit_linklocal(idev, link_dev))
2242 return;
2243 }
2244 /* then try to inherit it from any device */
881d966b 2245 for_each_netdev(&init_net, link_dev) {
1da177e4
LT		 2246 if (!ipv6_inherit_linklocal(idev, link_dev))
2247 return;
2248 }
2249 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2250}
2251
2252/*
2253 * Autoconfigure tunnel with a link-local address so routing protocols,
2254 * DHCPv6, MLD etc. can be run over the virtual link
2255 */
2256
2257static void addrconf_ip6_tnl_config(struct net_device *dev)
2258{
2259 struct inet6_dev *idev;
2260
2261 ASSERT_RTNL();
2262
2263 if ((idev = addrconf_add_dev(dev)) == NULL) {
2264 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2265 return;
2266 }
2267 ip6_tnl_add_linklocal(idev);
1da177e4
LT		 2268}
2269
1ab1457c 2270static int addrconf_notify(struct notifier_block *this, unsigned long event,
1da177e4
LT		 2271 void * data)
2272{
2273 struct net_device *dev = (struct net_device *) data;
74235a25 2274 struct inet6_dev *idev = __in6_dev_get(dev);
c5e33bdd 2275 int run_pending = 0;
b217d616 2276 int err;
1da177e4 2277
e9dc8653
EB		 2278 if (dev->nd_net != &init_net)
2279 return NOTIFY_DONE;
2280
1da177e4 2281 switch(event) {
45ba9dd2 2282 case NETDEV_REGISTER:
74235a25 2283 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
45ba9dd2
YH		 2284 idev = ipv6_add_dev(dev);
2285 if (!idev)
b217d616 2286 return notifier_from_errno(-ENOMEM);
45ba9dd2
YH		 2287 }
2288 break;
1da177e4 2289 case NETDEV_UP:
3c21edbd 2290 case NETDEV_CHANGE:
c2edacf8
JV		 2291 if (dev->flags & IFF_SLAVE)
2292 break;
2293
3c21edbd 2294 if (event == NETDEV_UP) {
f24e3d65 2295 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 2296 /* device is not ready yet. */
2297 printk(KERN_INFO
2298 "ADDRCONF(NETDEV_UP): %s: "
2299 "link is not ready\n",
2300 dev->name);
2301 break;
2302 }
99081049 2303
d31c7b8f
EP		 2304 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2305 idev = ipv6_add_dev(dev);
2306
99081049
KS		 2307 if (idev)
2308 idev->if_flags |= IF_READY;
3c21edbd 2309 } else {
f24e3d65 2310 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 2311 /* device is still not ready. */
2312 break;
2313 }
2314
2315 if (idev) {
2316 if (idev->if_flags & IF_READY) {
2317 /* device is already configured. */
2318 break;
2319 }
2320 idev->if_flags |= IF_READY;
2321 }
2322
2323 printk(KERN_INFO
2324 "ADDRCONF(NETDEV_CHANGE): %s: "
2325 "link becomes ready\n",
2326 dev->name);
2327
c5e33bdd 2328 run_pending = 1;
3c21edbd
YH		 2329 }
2330
1da177e4 2331 switch(dev->type) {
0be669bb 2332#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2333 case ARPHRD_SIT:
2334 addrconf_sit_config(dev);
2335 break;
0be669bb 2336#endif
1da177e4
LT		 2337 case ARPHRD_TUNNEL6:
2338 addrconf_ip6_tnl_config(dev);
2339 break;
2340 case ARPHRD_LOOPBACK:
2341 init_loopback(dev);
2342 break;
2343
2344 default:
2345 addrconf_dev_config(dev);
2346 break;
3ff50b79 2347 }
1da177e4 2348 if (idev) {
c5e33bdd
YH		 2349 if (run_pending)
2350 addrconf_dad_run(idev);
2351
1da177e4
LT		 2352 /* If the MTU changed during the interface down, when the
2353 interface up, the changed MTU must be reflected in the
2354 idev as well as routers.
2355 */
2356 if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2357 rt6_mtu_change(dev, dev->mtu);
2358 idev->cnf.mtu6 = dev->mtu;
2359 }
2360 idev->tstamp = jiffies;
2361 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2362 /* If the changed mtu during down is lower than IPV6_MIN_MTU
2363 stop IPv6 on this interface.
2364 */
2365 if (dev->mtu < IPV6_MIN_MTU)
2366 addrconf_ifdown(dev, event != NETDEV_DOWN);
2367 }
2368 break;
2369
2370 case NETDEV_CHANGEMTU:
d31c7b8f 2371 if (idev && dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 2372 rt6_mtu_change(dev, dev->mtu);
2373 idev->cnf.mtu6 = dev->mtu;
2374 break;
2375 }
2376
d31c7b8f
EP		 2377 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2378 idev = ipv6_add_dev(dev);
2379 if (idev)
2380 break;
2381 }
2382
1da177e4
LT		 2383 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2384
2385 case NETDEV_DOWN:
2386 case NETDEV_UNREGISTER:
2387 /*
2388 * Remove all addresses from this interface.
2389 */
2390 addrconf_ifdown(dev, event != NETDEV_DOWN);
2391 break;
3c21edbd 2392
1da177e4 2393 case NETDEV_CHANGENAME:
1da177e4 2394 if (idev) {
5632c515 2395 snmp6_unregister_dev(idev);
408c4768 2396 addrconf_sysctl_unregister(idev);
f52295a9 2397 addrconf_sysctl_register(idev);
b217d616
HX		 2398 err = snmp6_register_dev(idev);
2399 if (err)
2400 return notifier_from_errno(err);
5632c515 2401 }
1da177e4 2402 break;
3ff50b79 2403 }
1da177e4
LT		 2404
2405 return NOTIFY_OK;
2406}
2407
2408/*
2409 * addrconf module should be notified of a device going up
2410 */
2411static struct notifier_block ipv6_dev_notf = {
2412 .notifier_call = addrconf_notify,
2413 .priority = 0
2414};
2415
2416static int addrconf_ifdown(struct net_device *dev, int how)
2417{
2418 struct inet6_dev *idev;
2419 struct inet6_ifaddr *ifa, **bifa;
2420 int i;
2421
2422 ASSERT_RTNL();
2423
2774c7ab 2424 if (dev == init_net.loopback_dev && how == 1)
1da177e4
LT		 2425 how = 0;
2426
2427 rt6_ifdown(dev);
2428 neigh_ifdown(&nd_tbl, dev);
2429
2430 idev = __in6_dev_get(dev);
2431 if (idev == NULL)
2432 return -ENODEV;
2433
2434 /* Step 1: remove reference to ipv6 device from parent device.
1ab1457c 2435 Do not dev_put!
1da177e4
LT		 2436 */
2437 if (how == 1) {
1da177e4 2438 idev->dead = 1;
8814c4b5
YH		 2439
2440 /* protected by rtnl_lock */
2441 rcu_assign_pointer(dev->ip6_ptr, NULL);
1da177e4
LT		 2442
2443 /* Step 1.5: remove snmp6 entry */
2444 snmp6_unregister_dev(idev);
2445
2446 }
2447
2448 /* Step 2: clear hash table */
2449 for (i=0; i<IN6_ADDR_HSIZE; i++) {
2450 bifa = &inet6_addr_lst[i];
2451
2452 write_lock_bh(&addrconf_hash_lock);
2453 while ((ifa = *bifa) != NULL) {
2454 if (ifa->idev == idev) {
2455 *bifa = ifa->lst_next;
2456 ifa->lst_next = NULL;
2457 addrconf_del_timer(ifa);
2458 in6_ifa_put(ifa);
2459 continue;
2460 }
2461 bifa = &ifa->lst_next;
2462 }
2463 write_unlock_bh(&addrconf_hash_lock);
2464 }
2465
2466 write_lock_bh(&idev->lock);
2467
2468 /* Step 3: clear flags for stateless addrconf */
2469 if (how != 1)
3c21edbd 2470 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4
LT		 2471
2472 /* Step 4: clear address list */
2473#ifdef CONFIG_IPV6_PRIVACY
2474 if (how == 1 && del_timer(&idev->regen_timer))
2475 in6_dev_put(idev);
2476
2477 /* clear tempaddr list */
2478 while ((ifa = idev->tempaddr_list) != NULL) {
2479 idev->tempaddr_list = ifa->tmp_next;
2480 ifa->tmp_next = NULL;
2481 ifa->dead = 1;
2482 write_unlock_bh(&idev->lock);
2483 spin_lock_bh(&ifa->lock);
2484
2485 if (ifa->ifpub) {
2486 in6_ifa_put(ifa->ifpub);
2487 ifa->ifpub = NULL;
2488 }
2489 spin_unlock_bh(&ifa->lock);
2490 in6_ifa_put(ifa);
2491 write_lock_bh(&idev->lock);
2492 }
2493#endif
2494 while ((ifa = idev->addr_list) != NULL) {
2495 idev->addr_list = ifa->if_next;
2496 ifa->if_next = NULL;
2497 ifa->dead = 1;
2498 addrconf_del_timer(ifa);
2499 write_unlock_bh(&idev->lock);
2500
2501 __ipv6_ifa_notify(RTM_DELADDR, ifa);
063ed369 2502 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
1da177e4
LT		 2503 in6_ifa_put(ifa);
2504
2505 write_lock_bh(&idev->lock);
2506 }
2507 write_unlock_bh(&idev->lock);
2508
2509 /* Step 5: Discard multicast list */
2510
2511 if (how == 1)
2512 ipv6_mc_destroy_dev(idev);
2513 else
2514 ipv6_mc_down(idev);
2515
1da177e4 2516 idev->tstamp = jiffies;
1ab1457c 2517
1da177e4
LT		 2518 /* Shot the device (if unregistered) */
2519
2520 if (how == 1) {
408c4768 2521 addrconf_sysctl_unregister(idev);
1da177e4
LT		 2522 neigh_parms_release(&nd_tbl, idev->nd_parms);
2523 neigh_ifdown(&nd_tbl, dev);
2524 in6_dev_put(idev);
2525 }
2526 return 0;
2527}
2528
2529static void addrconf_rs_timer(unsigned long data)
2530{
2531 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2532
2533 if (ifp->idev->cnf.forwarding)
2534 goto out;
2535
2536 if (ifp->idev->if_flags & IF_RA_RCVD) {
2537 /*
2538 * Announcement received after solicitation
2539 * was sent
2540 */
2541 goto out;
2542 }
2543
2544 spin_lock(&ifp->lock);
2545 if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2546 struct in6_addr all_routers;
2547
2548 /* The wait after the last probe can be shorter */
2549 addrconf_mod_timer(ifp, AC_RS,
2550 (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2551 ifp->idev->cnf.rtr_solicit_delay :
2552 ifp->idev->cnf.rtr_solicit_interval);
2553 spin_unlock(&ifp->lock);
2554
2555 ipv6_addr_all_routers(&all_routers);
2556
2557 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2558 } else {
2559 spin_unlock(&ifp->lock);
2560 /*
2561 * Note: we do not support deprecated "all on-link"
2562 * assumption any longer.
2563 */
2564 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2565 ifp->idev->dev->name);
2566 }
2567
2568out:
2569 in6_ifa_put(ifp);
2570}
2571
2572/*
2573 * Duplicate Address Detection
2574 */
3c21edbd
YH		 2575static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2576{
2577 unsigned long rand_num;
2578 struct inet6_dev *idev = ifp->idev;
2579
95c385b4
NH		 2580 if (ifp->flags & IFA_F_OPTIMISTIC)
2581 rand_num = 0;
2582 else
2583 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2584
3c21edbd
YH		 2585 ifp->probes = idev->cnf.dad_transmits;
2586 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2587}
2588
e431b8c0 2589static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
1da177e4
LT		 2590{
2591 struct inet6_dev *idev = ifp->idev;
2592 struct net_device *dev = idev->dev;
1da177e4
LT		 2593
2594 addrconf_join_solict(dev, &ifp->addr);
2595
1da177e4 2596 net_srandom(ifp->addr.s6_addr32[3]);
1da177e4
LT		 2597
2598 read_lock_bh(&idev->lock);
2599 if (ifp->dead)
2600 goto out;
2601 spin_lock_bh(&ifp->lock);
2602
2603 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
55ebaef1
NT		 2604 !(ifp->flags&IFA_F_TENTATIVE) ||
2605 ifp->flags & IFA_F_NODAD) {
95c385b4 2606 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
1da177e4
LT		 2607 spin_unlock_bh(&ifp->lock);
2608 read_unlock_bh(&idev->lock);
2609
2610 addrconf_dad_completed(ifp);
2611 return;
2612 }
2613
6732bade 2614 if (!(idev->if_flags & IF_READY)) {
3dd3bf83 2615 spin_unlock_bh(&ifp->lock);
6732bade 2616 read_unlock_bh(&idev->lock);
3c21edbd
YH		 2617 /*
2618 * If the defice is not ready:
2619 * - keep it tentative if it is a permanent address.
2620 * - otherwise, kill it.
2621 */
2622 in6_ifa_hold(ifp);
2623 addrconf_dad_stop(ifp);
6732bade 2624 return;
3c21edbd 2625 }
95c385b4
NH		 2626
2627 /*
2628 * Optimistic nodes can start receiving
2629 * Frames right away
2630 */
2631 if(ifp->flags & IFA_F_OPTIMISTIC)
2632 ip6_ins_rt(ifp->rt);
2633
6732bade
YH		 2634 addrconf_dad_kick(ifp);
2635 spin_unlock_bh(&ifp->lock);
1da177e4
LT		 2636out:
2637 read_unlock_bh(&idev->lock);
2638}
2639
2640static void addrconf_dad_timer(unsigned long data)
2641{
2642 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2643 struct inet6_dev *idev = ifp->idev;
2644 struct in6_addr unspec;
2645 struct in6_addr mcaddr;
2646
2647 read_lock_bh(&idev->lock);
2648 if (idev->dead) {
2649 read_unlock_bh(&idev->lock);
2650 goto out;
2651 }
2652 spin_lock_bh(&ifp->lock);
2653 if (ifp->probes == 0) {
2654 /*
2655 * DAD was successful
2656 */
2657
95c385b4 2658 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
1da177e4
LT		 2659 spin_unlock_bh(&ifp->lock);
2660 read_unlock_bh(&idev->lock);
2661
2662 addrconf_dad_completed(ifp);
2663
2664 goto out;
2665 }
2666
2667 ifp->probes--;
2668 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2669 spin_unlock_bh(&ifp->lock);
2670 read_unlock_bh(&idev->lock);
2671
2672 /* send a neighbour solicitation for our addr */
2673 memset(&unspec, 0, sizeof(unspec));
2674 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2675 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec);
2676out:
2677 in6_ifa_put(ifp);
2678}
2679
2680static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2681{
2682 struct net_device * dev = ifp->idev->dev;
2683
2684 /*
2685 * Configure the address for reception. Now it is valid.
2686 */
2687
2688 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2689
2690 /* If added prefix is link local and forwarding is off,
2691 start sending router solicitations.
2692 */
2693
2694 if (ifp->idev->cnf.forwarding == 0 &&
2695 ifp->idev->cnf.rtr_solicits > 0 &&
2696 (dev->flags&IFF_LOOPBACK) == 0 &&
2697 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2698 struct in6_addr all_routers;
2699
2700 ipv6_addr_all_routers(&all_routers);
2701
2702 /*
2703 * If a host as already performed a random delay
2704 * [...] as part of DAD [...] there is no need
2705 * to delay again before sending the first RS
2706 */
2707 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2708
2709 spin_lock_bh(&ifp->lock);
2710 ifp->probes = 1;
2711 ifp->idev->if_flags |= IF_RS_SENT;
2712 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2713 spin_unlock_bh(&ifp->lock);
2714 }
2715}
2716
c5e33bdd
YH		 2717static void addrconf_dad_run(struct inet6_dev *idev) {
2718 struct inet6_ifaddr *ifp;
2719
2720 read_lock_bh(&idev->lock);
2721 for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2722 spin_lock_bh(&ifp->lock);
2723 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2724 spin_unlock_bh(&ifp->lock);
2725 continue;
2726 }
2727 spin_unlock_bh(&ifp->lock);
2728 addrconf_dad_kick(ifp);
2729 }
2730 read_unlock_bh(&idev->lock);
2731}
2732
1da177e4
LT		 2733#ifdef CONFIG_PROC_FS
2734struct if6_iter_state {
2735 int bucket;
2736};
2737
2738static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2739{
2740 struct inet6_ifaddr *ifa = NULL;
2741 struct if6_iter_state *state = seq->private;
2742
2743 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2744 ifa = inet6_addr_lst[state->bucket];
2745 if (ifa)
2746 break;
2747 }
2748 return ifa;
2749}
2750
2751static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2752{
2753 struct if6_iter_state *state = seq->private;
2754
2755 ifa = ifa->lst_next;
2756try_again:
2757 if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2758 ifa = inet6_addr_lst[state->bucket];
2759 goto try_again;
2760 }
2761 return ifa;
2762}
2763
2764static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2765{
2766 struct inet6_ifaddr *ifa = if6_get_first(seq);
2767
2768 if (ifa)
2769 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2770 --pos;
2771 return pos ? NULL : ifa;
2772}
2773
2774static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2775{
2776 read_lock_bh(&addrconf_hash_lock);
2777 return if6_get_idx(seq, *pos);
2778}
2779
2780static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2781{
2782 struct inet6_ifaddr *ifa;
2783
2784 ifa = if6_get_next(seq, v);
2785 ++*pos;
2786 return ifa;
2787}
2788
2789static void if6_seq_stop(struct seq_file *seq, void *v)
2790{
2791 read_unlock_bh(&addrconf_hash_lock);
2792}
2793
2794static int if6_seq_show(struct seq_file *seq, void *v)
2795{
2796 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2797 seq_printf(seq,
9343e79a 2798 NIP6_SEQFMT " %02x %02x %02x %02x %8s\n",
1da177e4
LT		 2799 NIP6(ifp->addr),
2800 ifp->idev->dev->ifindex,
2801 ifp->prefix_len,
2802 ifp->scope,
2803 ifp->flags,
2804 ifp->idev->dev->name);
2805 return 0;
2806}
2807
56b3d975 2808static const struct seq_operations if6_seq_ops = {
1da177e4
LT		 2809 .start = if6_seq_start,
2810 .next = if6_seq_next,
2811 .show = if6_seq_show,
2812 .stop = if6_seq_stop,
2813};
2814
2815static int if6_seq_open(struct inode *inode, struct file *file)
2816{
cf7732e4
PE		 2817 return seq_open_private(file, &if6_seq_ops,
2818 sizeof(struct if6_iter_state));
1da177e4
LT		 2819}
2820
9a32144e 2821static const struct file_operations if6_fops = {
1da177e4
LT		 2822 .owner = THIS_MODULE,
2823 .open = if6_seq_open,
2824 .read = seq_read,
2825 .llseek = seq_lseek,
2826 .release = seq_release_private,
2827};
2828
2829int __init if6_proc_init(void)
2830{
457c4cbc 2831 if (!proc_net_fops_create(&init_net, "if_inet6", S_IRUGO, &if6_fops))
1da177e4
LT		 2832 return -ENOMEM;
2833 return 0;
2834}
2835
2836void if6_proc_exit(void)
2837{
457c4cbc 2838 proc_net_remove(&init_net, "if_inet6");
1da177e4
LT		 2839}
2840#endif /* CONFIG_PROC_FS */
2841
59fbb3a6 2842#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3b9f9a1c
NT		 2843/* Check if address is a home address configured on any interface. */
2844int ipv6_chk_home_addr(struct in6_addr *addr)
2845{
2846 int ret = 0;
2847 struct inet6_ifaddr * ifp;
2848 u8 hash = ipv6_addr_hash(addr);
2849 read_lock_bh(&addrconf_hash_lock);
2850 for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) {
2851 if (ipv6_addr_cmp(&ifp->addr, addr) == 0 &&
2852 (ifp->flags & IFA_F_HOMEADDRESS)) {
2853 ret = 1;
2854 break;
2855 }
2856 }
2857 read_unlock_bh(&addrconf_hash_lock);
2858 return ret;
2859}
2860#endif
2861
1da177e4
LT		 2862/*
2863 * Periodic address status verification
2864 */
2865
2866static void addrconf_verify(unsigned long foo)
2867{
2868 struct inet6_ifaddr *ifp;
2869 unsigned long now, next;
2870 int i;
2871
2872 spin_lock_bh(&addrconf_verify_lock);
2873 now = jiffies;
2874 next = now + ADDR_CHECK_FREQUENCY;
2875
2876 del_timer(&addr_chk_timer);
2877
2878 for (i=0; i < IN6_ADDR_HSIZE; i++) {
2879
2880restart:
5d5780df 2881 read_lock(&addrconf_hash_lock);
1da177e4
LT		 2882 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
2883 unsigned long age;
2884#ifdef CONFIG_IPV6_PRIVACY
2885 unsigned long regen_advance;
2886#endif
2887
2888 if (ifp->flags & IFA_F_PERMANENT)
2889 continue;
2890
2891 spin_lock(&ifp->lock);
2892 age = (now - ifp->tstamp) / HZ;
2893
2894#ifdef CONFIG_IPV6_PRIVACY
1ab1457c
YH		 2895 regen_advance = ifp->idev->cnf.regen_max_retry *
2896 ifp->idev->cnf.dad_transmits *
1da177e4
LT		 2897 ifp->idev->nd_parms->retrans_time / HZ;
2898#endif
2899
8f27ebb9
YH		 2900 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
2901 age >= ifp->valid_lft) {
1da177e4
LT		 2902 spin_unlock(&ifp->lock);
2903 in6_ifa_hold(ifp);
5d5780df 2904 read_unlock(&addrconf_hash_lock);
1da177e4
LT		 2905 ipv6_del_addr(ifp);
2906 goto restart;
8f27ebb9
YH		 2907 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
2908 spin_unlock(&ifp->lock);
2909 continue;
1da177e4
LT		 2910 } else if (age >= ifp->prefered_lft) {
2911 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
2912 int deprecate = 0;
2913
2914 if (!(ifp->flags&IFA_F_DEPRECATED)) {
2915 deprecate = 1;
2916 ifp->flags |= IFA_F_DEPRECATED;
2917 }
2918
2919 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
2920 next = ifp->tstamp + ifp->valid_lft * HZ;
2921
2922 spin_unlock(&ifp->lock);
2923
2924 if (deprecate) {
2925 in6_ifa_hold(ifp);
5d5780df 2926 read_unlock(&addrconf_hash_lock);
1da177e4
LT		 2927
2928 ipv6_ifa_notify(0, ifp);
2929 in6_ifa_put(ifp);
2930 goto restart;
2931 }
2932#ifdef CONFIG_IPV6_PRIVACY
2933 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
2934 !(ifp->flags&IFA_F_TENTATIVE)) {
2935 if (age >= ifp->prefered_lft - regen_advance) {
2936 struct inet6_ifaddr *ifpub = ifp->ifpub;
2937 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2938 next = ifp->tstamp + ifp->prefered_lft * HZ;
2939 if (!ifp->regen_count && ifpub) {
2940 ifp->regen_count++;
2941 in6_ifa_hold(ifp);
2942 in6_ifa_hold(ifpub);
2943 spin_unlock(&ifp->lock);
5d5780df 2944 read_unlock(&addrconf_hash_lock);
291d809b
HY		 2945 spin_lock(&ifpub->lock);
2946 ifpub->regen_count = 0;
2947 spin_unlock(&ifpub->lock);
1da177e4
LT		 2948 ipv6_create_tempaddr(ifpub, ifp);
2949 in6_ifa_put(ifpub);
2950 in6_ifa_put(ifp);
2951 goto restart;
2952 }
2953 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
2954 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
2955 spin_unlock(&ifp->lock);
2956#endif
2957 } else {
2958 /* ifp->prefered_lft <= ifp->valid_lft */
2959 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2960 next = ifp->tstamp + ifp->prefered_lft * HZ;
2961 spin_unlock(&ifp->lock);
2962 }
2963 }
5d5780df 2964 read_unlock(&addrconf_hash_lock);
1da177e4
LT		 2965 }
2966
2967 addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
2968 add_timer(&addr_chk_timer);
2969 spin_unlock_bh(&addrconf_verify_lock);
2970}
2971
461d8837
TG		 2972static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
2973{
2974 struct in6_addr *pfx = NULL;
2975
2976 if (addr)
2977 pfx = nla_data(addr);
2978
2979 if (local) {
2980 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
2981 pfx = NULL;
2982 else
2983 pfx = nla_data(local);
2984 }
2985
2986 return pfx;
2987}
2988
ef7c79ed 2989static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
461d8837
TG		 2990 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
2991 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
2992 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
2993};
2994
1da177e4
LT		 2995static int
2996inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
2997{
b854272b 2998 struct net *net = skb->sk->sk_net;
b933f716
TG		 2999 struct ifaddrmsg *ifm;
3000 struct nlattr *tb[IFA_MAX+1];
1da177e4 3001 struct in6_addr *pfx;
b933f716 3002 int err;
1da177e4 3003
b854272b
DL		 3004 if (net != &init_net)
3005 return -EINVAL;
3006
b933f716
TG		 3007 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3008 if (err < 0)
3009 return err;
3010
3011 ifm = nlmsg_data(nlh);
3012 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
1da177e4
LT		 3013 if (pfx == NULL)
3014 return -EINVAL;
3015
3016 return inet6_addr_del(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3017}
3018
55ebaef1
NT		 3019static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3020 u32 prefered_lft, u32 valid_lft)
081bba5b 3021{
46d48046
YH		 3022 u32 flags = RTF_EXPIRES;
3023
081bba5b
NT		 3024 if (!valid_lft || (prefered_lft > valid_lft))
3025 return -EINVAL;
3026
46d48046 3027 if (valid_lft == INFINITY_LIFE_TIME) {
55ebaef1 3028 ifa_flags |= IFA_F_PERMANENT;
46d48046
YH		 3029 flags = 0;
3030 } else if (valid_lft >= 0x7FFFFFFF/HZ)
081bba5b
NT		 3031 valid_lft = 0x7FFFFFFF/HZ;
3032
3033 if (prefered_lft == 0)
55ebaef1 3034 ifa_flags |= IFA_F_DEPRECATED;
081bba5b
NT		 3035 else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
3036 (prefered_lft != INFINITY_LIFE_TIME))
3037 prefered_lft = 0x7FFFFFFF/HZ;
3038
3039 spin_lock_bh(&ifp->lock);
3b9f9a1c 3040 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
081bba5b
NT		 3041 ifp->tstamp = jiffies;
3042 ifp->valid_lft = valid_lft;
3043 ifp->prefered_lft = prefered_lft;
3044
3045 spin_unlock_bh(&ifp->lock);
3046 if (!(ifp->flags&IFA_F_TENTATIVE))
3047 ipv6_ifa_notify(0, ifp);
081bba5b 3048
46d48046
YH		 3049 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3050 jiffies_to_clock_t(valid_lft * HZ), flags);
081bba5b
NT		 3051 addrconf_verify(0);
3052
3053 return 0;
3054}
3055
1da177e4
LT		 3056static int
3057inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3058{
b854272b 3059 struct net *net = skb->sk->sk_net;
461d8837
TG		 3060 struct ifaddrmsg *ifm;
3061 struct nlattr *tb[IFA_MAX+1];
1da177e4 3062 struct in6_addr *pfx;
7198f8ce
TG		 3063 struct inet6_ifaddr *ifa;
3064 struct net_device *dev;
55ebaef1
NT		 3065 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3066 u8 ifa_flags;
461d8837 3067 int err;
1da177e4 3068
b854272b
DL		 3069 if (net != &init_net)
3070 return -EINVAL;
3071
461d8837
TG		 3072 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3073 if (err < 0)
3074 return err;
3075
3076 ifm = nlmsg_data(nlh);
3077 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
1da177e4
LT		 3078 if (pfx == NULL)
3079 return -EINVAL;
3080
461d8837 3081 if (tb[IFA_CACHEINFO]) {
0778769d 3082 struct ifa_cacheinfo *ci;
461d8837
TG		 3083
3084 ci = nla_data(tb[IFA_CACHEINFO]);
0778769d 3085 valid_lft = ci->ifa_valid;
461d8837
TG		 3086 preferred_lft = ci->ifa_prefered;
3087 } else {
3088 preferred_lft = INFINITY_LIFE_TIME;
3089 valid_lft = INFINITY_LIFE_TIME;
0778769d
NT		 3090 }
3091
881d966b 3092 dev = __dev_get_by_index(&init_net, ifm->ifa_index);
7198f8ce
TG		 3093 if (dev == NULL)
3094 return -ENODEV;
3095
55ebaef1 3096 /* We ignore other flags so far. */
3b9f9a1c 3097 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
55ebaef1 3098
7198f8ce
TG		 3099 ifa = ipv6_get_ifaddr(pfx, dev, 1);
3100 if (ifa == NULL) {
3101 /*
3102 * It would be best to check for !NLM_F_CREATE here but
3103 * userspace alreay relies on not having to provide this.
3104 */
3105 return inet6_addr_add(ifm->ifa_index, pfx, ifm->ifa_prefixlen,
55ebaef1 3106 ifa_flags, preferred_lft, valid_lft);
081bba5b
NT		 3107 }
3108
7198f8ce
TG		 3109 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3110 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3111 err = -EEXIST;
3112 else
55ebaef1 3113 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
7198f8ce
TG		 3114
3115 in6_ifa_put(ifa);
3116
3117 return err;
1da177e4
LT		 3118}
3119
101bb229
TG		 3120static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3121 u8 scope, int ifindex)
3122{
3123 struct ifaddrmsg *ifm;
3124
3125 ifm = nlmsg_data(nlh);
3126 ifm->ifa_family = AF_INET6;
3127 ifm->ifa_prefixlen = prefixlen;
3128 ifm->ifa_flags = flags;
3129 ifm->ifa_scope = scope;
3130 ifm->ifa_index = ifindex;
3131}
3132
85486af0
TG		 3133static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3134 unsigned long tstamp, u32 preferred, u32 valid)
3135{
3136 struct ifa_cacheinfo ci;
3137
3138 ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3139 + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3140 ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3141 + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3142 ci.ifa_prefered = preferred;
3143 ci.ifa_valid = valid;
3144
3145 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3146}
3147
101bb229
TG		 3148static inline int rt_scope(int ifa_scope)
3149{
3150 if (ifa_scope & IFA_HOST)
3151 return RT_SCOPE_HOST;
3152 else if (ifa_scope & IFA_LINK)
3153 return RT_SCOPE_LINK;
3154 else if (ifa_scope & IFA_SITE)
3155 return RT_SCOPE_SITE;
3156 else
3157 return RT_SCOPE_UNIVERSE;
3158}
3159
0ab6803b
TG		 3160static inline int inet6_ifaddr_msgsize(void)
3161{
339bf98f
TG		 3162 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3163 + nla_total_size(16) /* IFA_ADDRESS */
3164 + nla_total_size(sizeof(struct ifa_cacheinfo));
0ab6803b 3165}
c5396a31 3166
1da177e4 3167static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
b6544c0b 3168 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3169{
1da177e4 3170 struct nlmsghdr *nlh;
85486af0 3171 u32 preferred, valid;
1da177e4 3172
0ab6803b
TG		 3173 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3174 if (nlh == NULL)
26932566 3175 return -EMSGSIZE;
0ab6803b 3176
101bb229
TG		 3177 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3178 ifa->idev->dev->ifindex);
3179
1da177e4 3180 if (!(ifa->flags&IFA_F_PERMANENT)) {
85486af0
TG		 3181 preferred = ifa->prefered_lft;
3182 valid = ifa->valid_lft;
3183 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 3184 long tval = (jiffies - ifa->tstamp)/HZ;
85486af0
TG		 3185 preferred -= tval;
3186 if (valid != INFINITY_LIFE_TIME)
3187 valid -= tval;
1da177e4
LT		 3188 }
3189 } else {
85486af0
TG		 3190 preferred = INFINITY_LIFE_TIME;
3191 valid = INFINITY_LIFE_TIME;
3192 }
3193
0ab6803b 3194 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
26932566
PM		 3195 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3196 nlmsg_cancel(skb, nlh);
3197 return -EMSGSIZE;
3198 }
1da177e4 3199
0ab6803b 3200 return nlmsg_end(skb, nlh);
1da177e4
LT		 3201}
3202
3203static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
e431b8c0 3204 u32 pid, u32 seq, int event, u16 flags)
1da177e4 3205{
1da177e4 3206 struct nlmsghdr *nlh;
101bb229
TG		 3207 u8 scope = RT_SCOPE_UNIVERSE;
3208 int ifindex = ifmca->idev->dev->ifindex;
3209
3210 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3211 scope = RT_SCOPE_SITE;
1da177e4 3212
0ab6803b
TG		 3213 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3214 if (nlh == NULL)
26932566 3215 return -EMSGSIZE;
85486af0 3216
0ab6803b
TG		 3217 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3218 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3219 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 3220 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3221 nlmsg_cancel(skb, nlh);
3222 return -EMSGSIZE;
3223 }
85486af0 3224
0ab6803b 3225 return nlmsg_end(skb, nlh);
1da177e4
LT		 3226}
3227
3228static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
b6544c0b 3229 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3230{
1da177e4 3231 struct nlmsghdr *nlh;
101bb229
TG		 3232 u8 scope = RT_SCOPE_UNIVERSE;
3233 int ifindex = ifaca->aca_idev->dev->ifindex;
3234
3235 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3236 scope = RT_SCOPE_SITE;
1da177e4 3237
0ab6803b
TG		 3238 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3239 if (nlh == NULL)
26932566 3240 return -EMSGSIZE;
85486af0 3241
0ab6803b
TG		 3242 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3243 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3244 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 3245 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3246 nlmsg_cancel(skb, nlh);
3247 return -EMSGSIZE;
3248 }
1da177e4 3249
0ab6803b 3250 return nlmsg_end(skb, nlh);
1da177e4
LT		 3251}
3252
3253enum addr_type_t
3254{
3255 UNICAST_ADDR,
3256 MULTICAST_ADDR,
3257 ANYCAST_ADDR,
3258};
3259
3260static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3261 enum addr_type_t type)
3262{
3263 int idx, ip_idx;
3264 int s_idx, s_ip_idx;
3265 int err = 1;
3266 struct net_device *dev;
3267 struct inet6_dev *idev = NULL;
3268 struct inet6_ifaddr *ifa;
3269 struct ifmcaddr6 *ifmca;
3270 struct ifacaddr6 *ifaca;
3271
3272 s_idx = cb->args[0];
3273 s_ip_idx = ip_idx = cb->args[1];
1ab1457c 3274
7562f876 3275 idx = 0;
881d966b 3276 for_each_netdev(&init_net, dev) {
1da177e4 3277 if (idx < s_idx)
7562f876 3278 goto cont;
1da177e4
LT		 3279 if (idx > s_idx)
3280 s_ip_idx = 0;
3281 ip_idx = 0;
3282 if ((idev = in6_dev_get(dev)) == NULL)
7562f876 3283 goto cont;
1da177e4
LT		 3284 read_lock_bh(&idev->lock);
3285 switch (type) {
3286 case UNICAST_ADDR:
ae9cda5d 3287 /* unicast address incl. temp addr */
1da177e4
LT		 3288 for (ifa = idev->addr_list; ifa;
3289 ifa = ifa->if_next, ip_idx++) {
3290 if (ip_idx < s_ip_idx)
3291 continue;
1ab1457c
YH		 3292 if ((err = inet6_fill_ifaddr(skb, ifa,
3293 NETLINK_CB(cb->skb).pid,
b6544c0b
JHS		 3294 cb->nlh->nlmsg_seq, RTM_NEWADDR,
3295 NLM_F_MULTI)) <= 0)
1da177e4
LT		 3296 goto done;
3297 }
1da177e4
LT		 3298 break;
3299 case MULTICAST_ADDR:
3300 /* multicast address */
1ab1457c 3301 for (ifmca = idev->mc_list; ifmca;
1da177e4
LT		 3302 ifmca = ifmca->next, ip_idx++) {
3303 if (ip_idx < s_ip_idx)
3304 continue;
1ab1457c
YH		 3305 if ((err = inet6_fill_ifmcaddr(skb, ifmca,
3306 NETLINK_CB(cb->skb).pid,
b6544c0b
JHS		 3307 cb->nlh->nlmsg_seq, RTM_GETMULTICAST,
3308 NLM_F_MULTI)) <= 0)
1da177e4
LT		 3309 goto done;
3310 }
3311 break;
3312 case ANYCAST_ADDR:
3313 /* anycast address */
3314 for (ifaca = idev->ac_list; ifaca;
3315 ifaca = ifaca->aca_next, ip_idx++) {
3316 if (ip_idx < s_ip_idx)
3317 continue;
1ab1457c
YH		 3318 if ((err = inet6_fill_ifacaddr(skb, ifaca,
3319 NETLINK_CB(cb->skb).pid,
b6544c0b 3320 cb->nlh->nlmsg_seq, RTM_GETANYCAST,
1ab1457c 3321 NLM_F_MULTI)) <= 0)
1da177e4
LT		 3322 goto done;
3323 }
3324 break;
3325 default:
3326 break;
3327 }
3328 read_unlock_bh(&idev->lock);
3329 in6_dev_put(idev);
7562f876
PE		 3330cont:
3331 idx++;
1da177e4
LT		 3332 }
3333done:
3334 if (err <= 0) {
3335 read_unlock_bh(&idev->lock);
3336 in6_dev_put(idev);
3337 }
1da177e4
LT		 3338 cb->args[0] = idx;
3339 cb->args[1] = ip_idx;
3340 return skb->len;
3341}
3342
3343static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3344{
b854272b 3345 struct net *net = skb->sk->sk_net;
1da177e4 3346 enum addr_type_t type = UNICAST_ADDR;
b854272b
DL		 3347
3348 if (net != &init_net)
3349 return 0;
3350
1da177e4
LT		 3351 return inet6_dump_addr(skb, cb, type);
3352}
3353
3354static int inet6_dump_ifmcaddr(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 = MULTICAST_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
3365
3366static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3367{
b854272b 3368 struct net *net = skb->sk->sk_net;
1da177e4 3369 enum addr_type_t type = ANYCAST_ADDR;
b854272b
DL		 3370
3371 if (net != &init_net)
3372 return 0;
3373
1da177e4
LT		 3374 return inet6_dump_addr(skb, cb, type);
3375}
3376
1b29fc2c
TG		 3377static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3378 void *arg)
6c223828 3379{
b854272b 3380 struct net *net = in_skb->sk->sk_net;
1b29fc2c
TG		 3381 struct ifaddrmsg *ifm;
3382 struct nlattr *tb[IFA_MAX+1];
6c223828
NT		 3383 struct in6_addr *addr = NULL;
3384 struct net_device *dev = NULL;
3385 struct inet6_ifaddr *ifa;
3386 struct sk_buff *skb;
6c223828
NT		 3387 int err;
3388
b854272b
DL		 3389 if (net != &init_net)
3390 return -EINVAL;
3391
1b29fc2c
TG		 3392 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3393 if (err < 0)
3394 goto errout;
3395
3396 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3397 if (addr == NULL) {
3398 err = -EINVAL;
3399 goto errout;
6c223828 3400 }
6c223828 3401
1b29fc2c 3402 ifm = nlmsg_data(nlh);
6c223828 3403 if (ifm->ifa_index)
881d966b 3404 dev = __dev_get_by_index(&init_net, ifm->ifa_index);
6c223828 3405
1b29fc2c
TG		 3406 if ((ifa = ipv6_get_ifaddr(addr, dev, 1)) == NULL) {
3407 err = -EADDRNOTAVAIL;
3408 goto errout;
3409 }
6c223828 3410
0ab6803b 3411 if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) {
6c223828 3412 err = -ENOBUFS;
1b29fc2c 3413 goto errout_ifa;
6c223828
NT		 3414 }
3415
6c223828
NT		 3416 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3417 nlh->nlmsg_seq, RTM_NEWADDR, 0);
26932566
PM		 3418 if (err < 0) {
3419 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3420 WARN_ON(err == -EMSGSIZE);
3421 kfree_skb(skb);
3422 goto errout_ifa;
3423 }
97c53cac 3424 err = rtnl_unicast(skb, &init_net, NETLINK_CB(in_skb).pid);
1b29fc2c 3425errout_ifa:
6c223828 3426 in6_ifa_put(ifa);
1b29fc2c 3427errout:
6c223828 3428 return err;
6c223828
NT		 3429}
3430
1da177e4
LT		 3431static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3432{
3433 struct sk_buff *skb;
5d620266 3434 int err = -ENOBUFS;
1da177e4 3435
0ab6803b 3436 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5d620266
TG		 3437 if (skb == NULL)
3438 goto errout;
3439
3440 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
26932566
PM		 3441 if (err < 0) {
3442 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3443 WARN_ON(err == -EMSGSIZE);
3444 kfree_skb(skb);
3445 goto errout;
3446 }
97c53cac 3447 err = rtnl_notify(skb, &init_net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
5d620266
TG		 3448errout:
3449 if (err < 0)
97c53cac 3450 rtnl_set_sk_err(&init_net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 3451}
3452
b6f99a21 3453static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
1da177e4
LT		 3454 __s32 *array, int bytes)
3455{
04561c1f
TG		 3456 BUG_ON(bytes < (DEVCONF_MAX * 4));
3457
1da177e4
LT		 3458 memset(array, 0, bytes);
3459 array[DEVCONF_FORWARDING] = cnf->forwarding;
3460 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3461 array[DEVCONF_MTU6] = cnf->mtu6;
3462 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3463 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3464 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3465 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3466 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3467 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3468 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3469 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3470#ifdef CONFIG_IPV6_PRIVACY
3471 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3472 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3473 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3474 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3475 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3476#endif
3477 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 3478 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
c4fd30eb 3479 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 3480#ifdef CONFIG_IPV6_ROUTER_PREF
3481 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
52e16356 3482 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
fa03ef38 3483#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 3484 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3485#endif
930d6ff2 3486#endif
fbea49e1 3487 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
0bcbc926 3488 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
95c385b4
NH		 3489#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3490 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3491#endif
1da177e4
LT		 3492}
3493
339bf98f
TG		 3494static inline size_t inet6_if_nlmsg_size(void)
3495{
3496 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3497 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3498 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3499 + nla_total_size(4) /* IFLA_MTU */
3500 + nla_total_size(4) /* IFLA_LINK */
3501 + nla_total_size( /* IFLA_PROTINFO */
3502 nla_total_size(4) /* IFLA_INET6_FLAGS */
3503 + nla_total_size(sizeof(struct ifla_cacheinfo))
3504 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
bf99f1bd
YH		 3505 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3506 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
339bf98f
TG		 3507 );
3508}
c5396a31 3509
7f7d9a6b
HX		 3510static inline void __snmp6_fill_stats(u64 *stats, void **mib, int items,
3511 int bytes)
3512{
3513 int i;
3514 int pad = bytes - sizeof(u64) * items;
3515 BUG_ON(pad < 0);
3516
3517 /* Use put_unaligned() because stats may not be aligned for u64. */
3518 put_unaligned(items, &stats[0]);
3519 for (i = 1; i < items; i++)
3520 put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3521
3522 memset(&stats[items], 0, pad);
3523}
3524
3525static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3526 int bytes)
3527{
3528 switch(attrtype) {
3529 case IFLA_INET6_STATS:
3530 __snmp6_fill_stats(stats, (void **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes);
3531 break;
3532 case IFLA_INET6_ICMP6STATS:
3533 __snmp6_fill_stats(stats, (void **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
3534 break;
3535 }
3536}
3537
1ab1457c 3538static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
b6544c0b 3539 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3540{
04561c1f 3541 struct net_device *dev = idev->dev;
bf99f1bd 3542 struct nlattr *nla;
04561c1f
TG		 3543 struct ifinfomsg *hdr;
3544 struct nlmsghdr *nlh;
3545 void *protoinfo;
3546 struct ifla_cacheinfo ci;
3547
3548 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3549 if (nlh == NULL)
26932566 3550 return -EMSGSIZE;
04561c1f
TG		 3551
3552 hdr = nlmsg_data(nlh);
3553 hdr->ifi_family = AF_INET6;
3554 hdr->__ifi_pad = 0;
3555 hdr->ifi_type = dev->type;
3556 hdr->ifi_index = dev->ifindex;
3557 hdr->ifi_flags = dev_get_flags(dev);
3558 hdr->ifi_change = 0;
3559
3560 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
1da177e4
LT		 3561
3562 if (dev->addr_len)
04561c1f 3563 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
1da177e4 3564
04561c1f 3565 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
1da177e4 3566 if (dev->ifindex != dev->iflink)
04561c1f 3567 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
1da177e4 3568
04561c1f
TG		 3569 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3570 if (protoinfo == NULL)
3571 goto nla_put_failure;
1da177e4 3572
04561c1f 3573 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
1da177e4 3574
1da177e4
LT		 3575 ci.max_reasm_len = IPV6_MAXPLEN;
3576 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3577 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3578 ci.reachable_time = idev->nd_parms->reachable_time;
3579 ci.retrans_time = idev->nd_parms->retrans_time;
04561c1f
TG		 3580 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3581
bf99f1bd
YH		 3582 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3583 if (nla == NULL)
04561c1f 3584 goto nla_put_failure;
bf99f1bd 3585 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
1da177e4 3586
bf99f1bd
YH		 3587 /* XXX - MC not implemented */
3588
3589 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3590 if (nla == NULL)
3591 goto nla_put_failure;
3592 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3593
3594 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3595 if (nla == NULL)
3596 goto nla_put_failure;
3597 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
1da177e4 3598
04561c1f
TG		 3599 nla_nest_end(skb, protoinfo);
3600 return nlmsg_end(skb, nlh);
1da177e4 3601
04561c1f 3602nla_put_failure:
26932566
PM		 3603 nlmsg_cancel(skb, nlh);
3604 return -EMSGSIZE;
1da177e4
LT		 3605}
3606
3607static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3608{
b854272b 3609 struct net *net = skb->sk->sk_net;
1da177e4
LT		 3610 int idx, err;
3611 int s_idx = cb->args[0];
3612 struct net_device *dev;
3613 struct inet6_dev *idev;
3614
b854272b
DL		 3615 if (net != &init_net)
3616 return 0;
3617
1da177e4 3618 read_lock(&dev_base_lock);
7562f876 3619 idx = 0;
881d966b 3620 for_each_netdev(&init_net, dev) {
1da177e4 3621 if (idx < s_idx)
7562f876 3622 goto cont;
1da177e4 3623 if ((idev = in6_dev_get(dev)) == NULL)
7562f876 3624 goto cont;
1ab1457c 3625 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
b6544c0b 3626 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
1da177e4
LT		 3627 in6_dev_put(idev);
3628 if (err <= 0)
3629 break;
7562f876
PE		 3630cont:
3631 idx++;
1da177e4
LT		 3632 }
3633 read_unlock(&dev_base_lock);
3634 cb->args[0] = idx;
3635
3636 return skb->len;
3637}
3638
3639void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3640{
3641 struct sk_buff *skb;
8d7a76c9 3642 int err = -ENOBUFS;
1ab1457c 3643
339bf98f 3644 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
8d7a76c9
TG		 3645 if (skb == NULL)
3646 goto errout;
3647
3648 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 3649 if (err < 0) {
3650 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3651 WARN_ON(err == -EMSGSIZE);
3652 kfree_skb(skb);
3653 goto errout;
3654 }
97c53cac 3655 err = rtnl_notify(skb, &init_net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
8d7a76c9
TG		 3656errout:
3657 if (err < 0)
97c53cac 3658 rtnl_set_sk_err(&init_net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 3659}
3660
339bf98f
TG		 3661static inline size_t inet6_prefix_nlmsg_size(void)
3662{
3663 return NLMSG_ALIGN(sizeof(struct prefixmsg))
3664 + nla_total_size(sizeof(struct in6_addr))
3665 + nla_total_size(sizeof(struct prefix_cacheinfo));
3666}
c5396a31 3667
1da177e4 3668static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
6051e2f4
TG		 3669 struct prefix_info *pinfo, u32 pid, u32 seq,
3670 int event, unsigned int flags)
1da177e4 3671{
6051e2f4
TG		 3672 struct prefixmsg *pmsg;
3673 struct nlmsghdr *nlh;
1da177e4
LT		 3674 struct prefix_cacheinfo ci;
3675
6051e2f4
TG		 3676 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
3677 if (nlh == NULL)
26932566 3678 return -EMSGSIZE;
6051e2f4
TG		 3679
3680 pmsg = nlmsg_data(nlh);
1da177e4 3681 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 3682 pmsg->prefix_pad1 = 0;
3683 pmsg->prefix_pad2 = 0;
1da177e4
LT		 3684 pmsg->prefix_ifindex = idev->dev->ifindex;
3685 pmsg->prefix_len = pinfo->prefix_len;
3686 pmsg->prefix_type = pinfo->type;
8a47077a 3687 pmsg->prefix_pad3 = 0;
1da177e4
LT		 3688 pmsg->prefix_flags = 0;
3689 if (pinfo->onlink)
3690 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3691 if (pinfo->autoconf)
3692 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3693
6051e2f4 3694 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
1da177e4
LT		 3695
3696 ci.preferred_time = ntohl(pinfo->prefered);
3697 ci.valid_time = ntohl(pinfo->valid);
6051e2f4 3698 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
1da177e4 3699
6051e2f4 3700 return nlmsg_end(skb, nlh);
1da177e4 3701
6051e2f4 3702nla_put_failure:
26932566
PM		 3703 nlmsg_cancel(skb, nlh);
3704 return -EMSGSIZE;
1da177e4
LT		 3705}
3706
1ab1457c 3707static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 3708 struct prefix_info *pinfo)
3709{
3710 struct sk_buff *skb;
8c384bfa 3711 int err = -ENOBUFS;
1da177e4 3712
339bf98f 3713 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
8c384bfa
TG		 3714 if (skb == NULL)
3715 goto errout;
3716
3717 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 3718 if (err < 0) {
3719 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
3720 WARN_ON(err == -EMSGSIZE);
3721 kfree_skb(skb);
3722 goto errout;
3723 }
97c53cac 3724 err = rtnl_notify(skb, &init_net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
8c384bfa
TG		 3725errout:
3726 if (err < 0)
97c53cac 3727 rtnl_set_sk_err(&init_net, RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 3728}
3729
1da177e4
LT		 3730static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3731{
3732 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3733
3734 switch (event) {
3735 case RTM_NEWADDR:
95c385b4
NH		 3736 /*
3737 * If the address was optimistic
3738 * we inserted the route at the start of
3739 * our DAD process, so we don't need
3740 * to do it again
3741 */
3742 if (!(ifp->rt->rt6i_node))
3743 ip6_ins_rt(ifp->rt);
1da177e4
LT		 3744 if (ifp->idev->cnf.forwarding)
3745 addrconf_join_anycast(ifp);
3746 break;
3747 case RTM_DELADDR:
3748 if (ifp->idev->cnf.forwarding)
3749 addrconf_leave_anycast(ifp);
3750 addrconf_leave_solict(ifp->idev, &ifp->addr);
3751 dst_hold(&ifp->rt->u.dst);
e0a1ad73 3752 if (ip6_del_rt(ifp->rt))
1da177e4 3753 dst_free(&ifp->rt->u.dst);
1da177e4
LT		 3754 break;
3755 }
3756}
3757
3758static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3759{
8814c4b5 3760 rcu_read_lock_bh();
1da177e4
LT		 3761 if (likely(ifp->idev->dead == 0))
3762 __ipv6_ifa_notify(event, ifp);
8814c4b5 3763 rcu_read_unlock_bh();
1da177e4
LT		 3764}
3765
3766#ifdef CONFIG_SYSCTL
3767
3768static
3769int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3770 void __user *buffer, size_t *lenp, loff_t *ppos)
3771{
3772 int *valp = ctl->data;
3773 int val = *valp;
3774 int ret;
3775
3776 ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3777
c8fecf22
PE		 3778 if (write)
3779 addrconf_fixup_forwarding(ctl, valp, val);
1ab1457c 3780 return ret;
1da177e4
LT		 3781}
3782
1ab1457c 3783static int addrconf_sysctl_forward_strategy(ctl_table *table,
1da177e4
LT		 3784 int __user *name, int nlen,
3785 void __user *oldval,
3786 size_t __user *oldlenp,
1f29bcd7 3787 void __user *newval, size_t newlen)
1da177e4
LT		 3788{
3789 int *valp = table->data;
c8fecf22 3790 int val = *valp;
1da177e4
LT		 3791 int new;
3792
3793 if (!newval || !newlen)
3794 return 0;
3795 if (newlen != sizeof(int))
3796 return -EINVAL;
3797 if (get_user(new, (int __user *)newval))
3798 return -EFAULT;
3799 if (new == *valp)
3800 return 0;
3801 if (oldval && oldlenp) {
3802 size_t len;
3803 if (get_user(len, oldlenp))
3804 return -EFAULT;
3805 if (len) {
3806 if (len > table->maxlen)
3807 len = table->maxlen;
3808 if (copy_to_user(oldval, valp, len))
3809 return -EFAULT;
3810 if (put_user(len, oldlenp))
3811 return -EFAULT;
3812 }
3813 }
3814
c8fecf22
PE		 3815 *valp = new;
3816 addrconf_fixup_forwarding(table, valp, val);
1da177e4
LT		 3817 return 1;
3818}
3819
3820static struct addrconf_sysctl_table
3821{
3822 struct ctl_table_header *sysctl_header;
3823 ctl_table addrconf_vars[__NET_IPV6_MAX];
1dab6222 3824 char *dev_name;
ab32ea5d 3825} addrconf_sysctl __read_mostly = {
1da177e4
LT		 3826 .sysctl_header = NULL,
3827 .addrconf_vars = {
1ab1457c 3828 {
1da177e4
LT		 3829 .ctl_name = NET_IPV6_FORWARDING,
3830 .procname = "forwarding",
1ab1457c 3831 .data = &ipv6_devconf.forwarding,
1da177e4
LT		 3832 .maxlen = sizeof(int),
3833 .mode = 0644,
1ab1457c 3834 .proc_handler = &addrconf_sysctl_forward,
1da177e4
LT		 3835 .strategy = &addrconf_sysctl_forward_strategy,
3836 },
3837 {
3838 .ctl_name = NET_IPV6_HOP_LIMIT,
3839 .procname = "hop_limit",
1ab1457c 3840 .data = &ipv6_devconf.hop_limit,
1da177e4
LT		 3841 .maxlen = sizeof(int),
3842 .mode = 0644,
3843 .proc_handler = proc_dointvec,
3844 },
3845 {
3846 .ctl_name = NET_IPV6_MTU,
3847 .procname = "mtu",
3848 .data = &ipv6_devconf.mtu6,
1ab1457c 3849 .maxlen = sizeof(int),
1da177e4 3850 .mode = 0644,
1ab1457c 3851 .proc_handler = &proc_dointvec,
1da177e4
LT		 3852 },
3853 {
3854 .ctl_name = NET_IPV6_ACCEPT_RA,
3855 .procname = "accept_ra",
1ab1457c 3856 .data = &ipv6_devconf.accept_ra,
1da177e4
LT		 3857 .maxlen = sizeof(int),
3858 .mode = 0644,
1ab1457c 3859 .proc_handler = &proc_dointvec,
1da177e4
LT		 3860 },
3861 {
3862 .ctl_name = NET_IPV6_ACCEPT_REDIRECTS,
3863 .procname = "accept_redirects",
1ab1457c 3864 .data = &ipv6_devconf.accept_redirects,
1da177e4
LT		 3865 .maxlen = sizeof(int),
3866 .mode = 0644,
1ab1457c 3867 .proc_handler = &proc_dointvec,
1da177e4
LT		 3868 },
3869 {
3870 .ctl_name = NET_IPV6_AUTOCONF,
3871 .procname = "autoconf",
1ab1457c 3872 .data = &ipv6_devconf.autoconf,
1da177e4
LT		 3873 .maxlen = sizeof(int),
3874 .mode = 0644,
1ab1457c 3875 .proc_handler = &proc_dointvec,
1da177e4
LT		 3876 },
3877 {
3878 .ctl_name = NET_IPV6_DAD_TRANSMITS,
3879 .procname = "dad_transmits",
1ab1457c 3880 .data = &ipv6_devconf.dad_transmits,
1da177e4
LT		 3881 .maxlen = sizeof(int),
3882 .mode = 0644,
1ab1457c 3883 .proc_handler = &proc_dointvec,
1da177e4
LT		 3884 },
3885 {
3886 .ctl_name = NET_IPV6_RTR_SOLICITS,
3887 .procname = "router_solicitations",
1ab1457c 3888 .data = &ipv6_devconf.rtr_solicits,
1da177e4
LT		 3889 .maxlen = sizeof(int),
3890 .mode = 0644,
1ab1457c 3891 .proc_handler = &proc_dointvec,
1da177e4
LT		 3892 },
3893 {
3894 .ctl_name = NET_IPV6_RTR_SOLICIT_INTERVAL,
3895 .procname = "router_solicitation_interval",
1ab1457c 3896 .data = &ipv6_devconf.rtr_solicit_interval,
1da177e4
LT		 3897 .maxlen = sizeof(int),
3898 .mode = 0644,
1ab1457c 3899 .proc_handler = &proc_dointvec_jiffies,
1da177e4
LT		 3900 .strategy = &sysctl_jiffies,
3901 },
3902 {
3903 .ctl_name = NET_IPV6_RTR_SOLICIT_DELAY,
3904 .procname = "router_solicitation_delay",
1ab1457c 3905 .data = &ipv6_devconf.rtr_solicit_delay,
1da177e4
LT		 3906 .maxlen = sizeof(int),
3907 .mode = 0644,
1ab1457c 3908 .proc_handler = &proc_dointvec_jiffies,
1da177e4
LT		 3909 .strategy = &sysctl_jiffies,
3910 },
3911 {
3912 .ctl_name = NET_IPV6_FORCE_MLD_VERSION,
3913 .procname = "force_mld_version",
1ab1457c 3914 .data = &ipv6_devconf.force_mld_version,
1da177e4
LT		 3915 .maxlen = sizeof(int),
3916 .mode = 0644,
1ab1457c 3917 .proc_handler = &proc_dointvec,
1da177e4
LT		 3918 },
3919#ifdef CONFIG_IPV6_PRIVACY
3920 {
3921 .ctl_name = NET_IPV6_USE_TEMPADDR,
3922 .procname = "use_tempaddr",
1ab1457c 3923 .data = &ipv6_devconf.use_tempaddr,
1da177e4
LT		 3924 .maxlen = sizeof(int),
3925 .mode = 0644,
1ab1457c 3926 .proc_handler = &proc_dointvec,
1da177e4
LT		 3927 },
3928 {
3929 .ctl_name = NET_IPV6_TEMP_VALID_LFT,
3930 .procname = "temp_valid_lft",
1ab1457c 3931 .data = &ipv6_devconf.temp_valid_lft,
1da177e4
LT		 3932 .maxlen = sizeof(int),
3933 .mode = 0644,
1ab1457c 3934 .proc_handler = &proc_dointvec,
1da177e4
LT		 3935 },
3936 {
3937 .ctl_name = NET_IPV6_TEMP_PREFERED_LFT,
3938 .procname = "temp_prefered_lft",
1ab1457c 3939 .data = &ipv6_devconf.temp_prefered_lft,
1da177e4
LT		 3940 .maxlen = sizeof(int),
3941 .mode = 0644,
1ab1457c 3942 .proc_handler = &proc_dointvec,
1da177e4
LT		 3943 },
3944 {
3945 .ctl_name = NET_IPV6_REGEN_MAX_RETRY,
3946 .procname = "regen_max_retry",
1ab1457c 3947 .data = &ipv6_devconf.regen_max_retry,
1da177e4
LT		 3948 .maxlen = sizeof(int),
3949 .mode = 0644,
1ab1457c 3950 .proc_handler = &proc_dointvec,
1da177e4
LT		 3951 },
3952 {
3953 .ctl_name = NET_IPV6_MAX_DESYNC_FACTOR,
3954 .procname = "max_desync_factor",
1ab1457c 3955 .data = &ipv6_devconf.max_desync_factor,
1da177e4
LT		 3956 .maxlen = sizeof(int),
3957 .mode = 0644,
1ab1457c 3958 .proc_handler = &proc_dointvec,
1da177e4
LT		 3959 },
3960#endif
3961 {
3962 .ctl_name = NET_IPV6_MAX_ADDRESSES,
3963 .procname = "max_addresses",
3964 .data = &ipv6_devconf.max_addresses,
3965 .maxlen = sizeof(int),
3966 .mode = 0644,
3967 .proc_handler = &proc_dointvec,
3968 },
65f5c7c1
YH		 3969 {
3970 .ctl_name = NET_IPV6_ACCEPT_RA_DEFRTR,
3971 .procname = "accept_ra_defrtr",
1ab1457c 3972 .data = &ipv6_devconf.accept_ra_defrtr,
65f5c7c1
YH		 3973 .maxlen = sizeof(int),
3974 .mode = 0644,
1ab1457c 3975 .proc_handler = &proc_dointvec,
65f5c7c1 3976 },
c4fd30eb
YH		 3977 {
3978 .ctl_name = NET_IPV6_ACCEPT_RA_PINFO,
3979 .procname = "accept_ra_pinfo",
1ab1457c 3980 .data = &ipv6_devconf.accept_ra_pinfo,
c4fd30eb
YH		 3981 .maxlen = sizeof(int),
3982 .mode = 0644,
1ab1457c 3983 .proc_handler = &proc_dointvec,
c4fd30eb 3984 },
930d6ff2
YH		 3985#ifdef CONFIG_IPV6_ROUTER_PREF
3986 {
3987 .ctl_name = NET_IPV6_ACCEPT_RA_RTR_PREF,
3988 .procname = "accept_ra_rtr_pref",
3989 .data = &ipv6_devconf.accept_ra_rtr_pref,
3990 .maxlen = sizeof(int),
3991 .mode = 0644,
3992 .proc_handler = &proc_dointvec,
3993 },
52e16356
YH		 3994 {
3995 .ctl_name = NET_IPV6_RTR_PROBE_INTERVAL,
3996 .procname = "router_probe_interval",
3997 .data = &ipv6_devconf.rtr_probe_interval,
3998 .maxlen = sizeof(int),
3999 .mode = 0644,
4000 .proc_handler = &proc_dointvec_jiffies,
4001 .strategy = &sysctl_jiffies,
4002 },
fa03ef38 4003#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 4004 {
4005 .ctl_name = NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN,
4006 .procname = "accept_ra_rt_info_max_plen",
4007 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4008 .maxlen = sizeof(int),
4009 .mode = 0644,
4010 .proc_handler = &proc_dointvec,
4011 },
4012#endif
930d6ff2 4013#endif
fbea49e1
YH		 4014 {
4015 .ctl_name = NET_IPV6_PROXY_NDP,
4016 .procname = "proxy_ndp",
4017 .data = &ipv6_devconf.proxy_ndp,
4018 .maxlen = sizeof(int),
4019 .mode = 0644,
4020 .proc_handler = &proc_dointvec,
4021 },
0bcbc926
YH		 4022 {
4023 .ctl_name = NET_IPV6_ACCEPT_SOURCE_ROUTE,
4024 .procname = "accept_source_route",
4025 .data = &ipv6_devconf.accept_source_route,
4026 .maxlen = sizeof(int),
4027 .mode = 0644,
4028 .proc_handler = &proc_dointvec,
4029 },
95c385b4
NH		 4030#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4031 {
4032 .ctl_name = CTL_UNNUMBERED,
4033 .procname = "optimistic_dad",
4034 .data = &ipv6_devconf.optimistic_dad,
4035 .maxlen = sizeof(int),
4036 .mode = 0644,
4037 .proc_handler = &proc_dointvec,
4038
4039 },
4040#endif
1da177e4
LT		 4041 {
4042 .ctl_name = 0, /* sentinel */
4043 }
4044 },
1da177e4
LT		 4045};
4046
95897312 4047static int __addrconf_sysctl_register(char *dev_name, int ctl_name,
f52295a9 4048 struct inet6_dev *idev, struct ipv6_devconf *p)
1da177e4
LT		 4049{
4050 int i;
1da177e4 4051 struct addrconf_sysctl_table *t;
1da177e4 4052
1dab6222
PE		 4053#define ADDRCONF_CTL_PATH_DEV 3
4054
4055 struct ctl_path addrconf_ctl_path[] = {
4056 { .procname = "net", .ctl_name = CTL_NET, },
4057 { .procname = "ipv6", .ctl_name = NET_IPV6, },
4058 { .procname = "conf", .ctl_name = NET_IPV6_CONF, },
4059 { /* to be set */ },
4060 { },
4061 };
4062
4063
af879cc7 4064 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
1da177e4 4065 if (t == NULL)
f68635e6
PE		 4066 goto out;
4067
1da177e4
LT		 4068 for (i=0; t->addrconf_vars[i].data; i++) {
4069 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
1da177e4
LT		 4070 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4071 }
1da177e4 4072
1ab1457c
YH		 4073 /*
4074 * Make a copy of dev_name, because '.procname' is regarded as const
1da177e4
LT		 4075 * by sysctl and we wouldn't want anyone to change it under our feet
4076 * (see SIOCSIFNAME).
1ab1457c 4077 */
1dab6222
PE		 4078 t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4079 if (!t->dev_name)
f68635e6 4080 goto free;
1da177e4 4081
1dab6222
PE		 4082 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
4083 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].ctl_name = ctl_name;
1da177e4 4084
1dab6222
PE		 4085 t->sysctl_header = register_sysctl_paths(addrconf_ctl_path,
4086 t->addrconf_vars);
1da177e4
LT		 4087 if (t->sysctl_header == NULL)
4088 goto free_procname;
f68635e6
PE		 4089
4090 p->sysctl = t;
95897312 4091 return 0;
1da177e4 4092
f68635e6 4093free_procname:
1dab6222 4094 kfree(t->dev_name);
f68635e6 4095free:
1da177e4 4096 kfree(t);
f68635e6 4097out:
95897312 4098 return -ENOBUFS;
1da177e4
LT		 4099}
4100
408c4768
PE		 4101static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4102{
4103 struct addrconf_sysctl_table *t;
4104
4105 if (p->sysctl == NULL)
4106 return;
4107
4108 t = p->sysctl;
4109 p->sysctl = NULL;
4110 unregister_sysctl_table(t->sysctl_header);
4111 kfree(t->dev_name);
4112 kfree(t);
4113}
4114
f52295a9
PE		 4115static void addrconf_sysctl_register(struct inet6_dev *idev)
4116{
408c4768
PE		 4117 neigh_sysctl_register(idev->dev, idev->nd_parms, NET_IPV6,
4118 NET_IPV6_NEIGH, "ipv6",
4119 &ndisc_ifinfo_sysctl_change,
4120 NULL);
f52295a9
PE		 4121 __addrconf_sysctl_register(idev->dev->name, idev->dev->ifindex,
4122 idev, &idev->cnf);
4123}
4124
408c4768 4125static void addrconf_sysctl_unregister(struct inet6_dev *idev)
1da177e4 4126{
408c4768
PE		 4127 __addrconf_sysctl_unregister(&idev->cnf);
4128 neigh_sysctl_unregister(idev->nd_parms);
1da177e4
LT		 4129}
4130
4131
4132#endif
4133
4134/*
4135 * Device notifier
4136 */
4137
4138int register_inet6addr_notifier(struct notifier_block *nb)
4139{
1ab1457c 4140 return atomic_notifier_chain_register(&inet6addr_chain, nb);
1da177e4
LT		 4141}
4142
7159039a
YH		 4143EXPORT_SYMBOL(register_inet6addr_notifier);
4144
1da177e4
LT		 4145int unregister_inet6addr_notifier(struct notifier_block *nb)
4146{
1ab1457c 4147 return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
1da177e4
LT		 4148}
4149
7159039a
YH		 4150EXPORT_SYMBOL(unregister_inet6addr_notifier);
4151
1da177e4
LT		 4152/*
4153 * Init / cleanup code
4154 */
4155
4156int __init addrconf_init(void)
4157{
2a8cc6c8
YH		 4158 int err;
4159
4160 if ((err = ipv6_addr_label_init()) < 0) {
4161 printk(KERN_CRIT "IPv6 Addrconf: cannot initialize default policy table: %d.\n",
4162 err);
4163 return err;
4164 }
1da177e4
LT		 4165
4166 /* The addrconf netdev notifier requires that loopback_dev
4167 * has it's ipv6 private information allocated and setup
4168 * before it can bring up and give link-local addresses
4169 * to other devices which are up.
4170 *
4171 * Unfortunately, loopback_dev is not necessarily the first
4172 * entry in the global dev_base list of net devices. In fact,
4173 * it is likely to be the very last entry on that list.
4174 * So this causes the notifier registry below to try and
4175 * give link-local addresses to all devices besides loopback_dev
4176 * first, then loopback_dev, which cases all the non-loopback_dev
4177 * devices to fail to get a link-local address.
4178 *
4179 * So, as a temporary fix, allocate the ipv6 structure for
4180 * loopback_dev first by hand.
4181 * Longer term, all of the dependencies ipv6 has upon the loopback
4182 * device and it being up should be removed.
4183 */
4184 rtnl_lock();
2774c7ab 4185 if (!ipv6_add_dev(init_net.loopback_dev))
1da177e4
LT		 4186 err = -ENOMEM;
4187 rtnl_unlock();
4188 if (err)
4189 return err;
4190
2774c7ab
EB		 4191 ip6_null_entry.u.dst.dev = init_net.loopback_dev;
4192 ip6_null_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev);
9a6bf6fe 4193#ifdef CONFIG_IPV6_MULTIPLE_TABLES
2774c7ab
EB		 4194 ip6_prohibit_entry.u.dst.dev = init_net.loopback_dev;
4195 ip6_prohibit_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev);
4196 ip6_blk_hole_entry.u.dst.dev = init_net.loopback_dev;
4197 ip6_blk_hole_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev);
9a6bf6fe 4198#endif
c62dba90 4199
1da177e4
LT		 4200 register_netdevice_notifier(&ipv6_dev_notf);
4201
1da177e4 4202 addrconf_verify(0);
c127ea2c
TG		 4203
4204 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4205 if (err < 0)
4206 goto errout;
4207
4208 /* Only the first call to __rtnl_register can fail */
4209 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4210 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4211 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4212 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4213 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4214
2a8cc6c8
YH		 4215 ipv6_addr_label_rtnl_register();
4216
1da177e4 4217#ifdef CONFIG_SYSCTL
f52295a9
PE		 4218 __addrconf_sysctl_register("all", NET_PROTO_CONF_ALL,
4219 NULL, &ipv6_devconf);
4220 __addrconf_sysctl_register("default", NET_PROTO_CONF_DEFAULT,
4221 NULL, &ipv6_devconf_dflt);
1da177e4
LT		 4222#endif
4223
4224 return 0;
c127ea2c
TG		 4225errout:
4226 unregister_netdevice_notifier(&ipv6_dev_notf);
4227
4228 return err;
1da177e4
LT		 4229}
4230
09f7709f 4231void addrconf_cleanup(void)
1da177e4 4232{
1ab1457c 4233 struct net_device *dev;
1ab1457c 4234 struct inet6_ifaddr *ifa;
1da177e4
LT		 4235 int i;
4236
4237 unregister_netdevice_notifier(&ipv6_dev_notf);
4238
1da177e4 4239#ifdef CONFIG_SYSCTL
408c4768
PE		 4240 __addrconf_sysctl_unregister(&ipv6_devconf_dflt);
4241 __addrconf_sysctl_unregister(&ipv6_devconf);
1da177e4
LT		 4242#endif
4243
4244 rtnl_lock();
4245
4246 /*
4247 * clean dev list.
4248 */
4249
881d966b 4250 for_each_netdev(&init_net, dev) {
dffe4f04 4251 if (__in6_dev_get(dev) == NULL)
1da177e4
LT		 4252 continue;
4253 addrconf_ifdown(dev, 1);
4254 }
2774c7ab 4255 addrconf_ifdown(init_net.loopback_dev, 2);
1da177e4
LT		 4256
4257 /*
4258 * Check hash table.
4259 */
4260
4261 write_lock_bh(&addrconf_hash_lock);
4262 for (i=0; i < IN6_ADDR_HSIZE; i++) {
4263 for (ifa=inet6_addr_lst[i]; ifa; ) {
4264 struct inet6_ifaddr *bifa;
4265
4266 bifa = ifa;
4267 ifa = ifa->lst_next;
4268 printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
4269 /* Do not free it; something is wrong.
4270 Now we can investigate it with debugger.
4271 */
4272 }
4273 }
4274 write_unlock_bh(&addrconf_hash_lock);
4275
4276 del_timer(&addr_chk_timer);
4277
4278 rtnl_unlock();
1da177e4 4279}
Linux 6.x block layer and io_uring tree(s)