projects / linux-block.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
[NEIGH]: Add a comment describing what a NUD stands for.
[linux-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;
441fc2a2 337 memcpy(&ndev->cnf, dev->nd_net->ipv6.devconf_dflt, sizeof(ndev->cnf));
322f74a4
IO		 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
e186932b 459static void addrconf_forward_change(struct net *net, __s32 newf)
1da177e4
LT		 460{
461 struct net_device *dev;
462 struct inet6_dev *idev;
463
464 read_lock(&dev_base_lock);
bff16c2f 465 for_each_netdev(net, dev) {
8814c4b5 466 rcu_read_lock();
1da177e4
LT		 467 idev = __in6_dev_get(dev);
468 if (idev) {
e186932b
PE		 469 int changed = (!idev->cnf.forwarding) ^ (!newf);
470 idev->cnf.forwarding = newf;
1da177e4
LT		 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{
bff16c2f
PE		 481 struct net *net;
482
483 net = (struct net *)table->extra2;
441fc2a2 484 if (p == &net->ipv6.devconf_dflt->forwarding)
c8fecf22
PE		 485 return;
486
e186932b
PE		 487 if (p == &net->ipv6.devconf_all->forwarding) {
488 __s32 newf = net->ipv6.devconf_all->forwarding;
489 net->ipv6.devconf_dflt->forwarding = newf;
490 addrconf_forward_change(net, newf);
c8fecf22
PE		 491 } else if ((!*p) ^ (!old))
492 dev_forward_change((struct inet6_dev *)table->extra1);
493
494 if (*p)
495 rt6_purge_dflt_routers();
496}
1da177e4
LT		 497#endif
498
499/* Nobody refers to this ifaddr, destroy it */
500
501void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
502{
503 BUG_TRAP(ifp->if_next==NULL);
504 BUG_TRAP(ifp->lst_next==NULL);
505#ifdef NET_REFCNT_DEBUG
506 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
507#endif
508
509 in6_dev_put(ifp->idev);
510
511 if (del_timer(&ifp->timer))
512 printk("Timer is still running, when freeing ifa=%p\n", ifp);
513
514 if (!ifp->dead) {
515 printk("Freeing alive inet6 address %p\n", ifp);
516 return;
517 }
518 dst_release(&ifp->rt->u.dst);
519
520 kfree(ifp);
521}
522
e55ffac6
BH		 523static void
524ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
525{
526 struct inet6_ifaddr *ifa, **ifap;
8a6ce0c0 527 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
e55ffac6
BH		 528
529 /*
530 * Each device address list is sorted in order of scope -
531 * global before linklocal.
532 */
533 for (ifap = &idev->addr_list; (ifa = *ifap) != NULL;
534 ifap = &ifa->if_next) {
8a6ce0c0 535 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
e55ffac6
BH		 536 break;
537 }
538
539 ifp->if_next = *ifap;
540 *ifap = ifp;
541}
542
1da177e4
LT		 543/* On success it returns ifp with increased reference count */
544
545static struct inet6_ifaddr *
546ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
e431b8c0 547 int scope, u32 flags)
1da177e4
LT		 548{
549 struct inet6_ifaddr *ifa = NULL;
550 struct rt6_info *rt;
551 int hash;
552 int err = 0;
553
8814c4b5 554 rcu_read_lock_bh();
1da177e4
LT		 555 if (idev->dead) {
556 err = -ENODEV; /*XXX*/
557 goto out2;
558 }
559
560 write_lock(&addrconf_hash_lock);
561
562 /* Ignore adding duplicate addresses on an interface */
563 if (ipv6_chk_same_addr(addr, idev->dev)) {
564 ADBG(("ipv6_add_addr: already assigned\n"));
565 err = -EEXIST;
566 goto out;
567 }
568
322f74a4 569 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
1da177e4
LT		 570
571 if (ifa == NULL) {
572 ADBG(("ipv6_add_addr: malloc failed\n"));
573 err = -ENOBUFS;
574 goto out;
575 }
576
577 rt = addrconf_dst_alloc(idev, addr, 0);
578 if (IS_ERR(rt)) {
579 err = PTR_ERR(rt);
580 goto out;
581 }
582
1da177e4
LT		 583 ipv6_addr_copy(&ifa->addr, addr);
584
585 spin_lock_init(&ifa->lock);
586 init_timer(&ifa->timer);
587 ifa->timer.data = (unsigned long) ifa;
588 ifa->scope = scope;
589 ifa->prefix_len = pfxlen;
590 ifa->flags = flags | IFA_F_TENTATIVE;
591 ifa->cstamp = ifa->tstamp = jiffies;
592
57f5f544
KF		 593 ifa->rt = rt;
594
95c385b4
NH		 595 /*
596 * part one of RFC 4429, section 3.3
597 * We should not configure an address as
598 * optimistic if we do not yet know the link
599 * layer address of our nexhop router
600 */
601
602 if (rt->rt6i_nexthop == NULL)
603 ifa->flags &= ~IFA_F_OPTIMISTIC;
604
1da177e4
LT		 605 ifa->idev = idev;
606 in6_dev_hold(idev);
607 /* For caller */
608 in6_ifa_hold(ifa);
609
610 /* Add to big hash table */
611 hash = ipv6_addr_hash(addr);
612
613 ifa->lst_next = inet6_addr_lst[hash];
614 inet6_addr_lst[hash] = ifa;
615 in6_ifa_hold(ifa);
616 write_unlock(&addrconf_hash_lock);
617
618 write_lock(&idev->lock);
619 /* Add to inet6_dev unicast addr list. */
e55ffac6 620 ipv6_link_dev_addr(idev, ifa);
1da177e4
LT		 621
622#ifdef CONFIG_IPV6_PRIVACY
623 if (ifa->flags&IFA_F_TEMPORARY) {
624 ifa->tmp_next = idev->tempaddr_list;
625 idev->tempaddr_list = ifa;
626 in6_ifa_hold(ifa);
627 }
628#endif
629
1da177e4
LT		 630 in6_ifa_hold(ifa);
631 write_unlock(&idev->lock);
632out2:
8814c4b5 633 rcu_read_unlock_bh();
1da177e4 634
fd92833a 635 if (likely(err == 0))
e041c683 636 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
1da177e4
LT		 637 else {
638 kfree(ifa);
639 ifa = ERR_PTR(err);
640 }
641
642 return ifa;
643out:
644 write_unlock(&addrconf_hash_lock);
645 goto out2;
646}
647
648/* This function wants to get referenced ifp and releases it before return */
649
650static void ipv6_del_addr(struct inet6_ifaddr *ifp)
651{
652 struct inet6_ifaddr *ifa, **ifap;
653 struct inet6_dev *idev = ifp->idev;
654 int hash;
655 int deleted = 0, onlink = 0;
656 unsigned long expires = jiffies;
657
658 hash = ipv6_addr_hash(&ifp->addr);
659
660 ifp->dead = 1;
661
662 write_lock_bh(&addrconf_hash_lock);
663 for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
664 ifap = &ifa->lst_next) {
665 if (ifa == ifp) {
666 *ifap = ifa->lst_next;
667 __in6_ifa_put(ifp);
668 ifa->lst_next = NULL;
669 break;
670 }
671 }
672 write_unlock_bh(&addrconf_hash_lock);
673
674 write_lock_bh(&idev->lock);
675#ifdef CONFIG_IPV6_PRIVACY
676 if (ifp->flags&IFA_F_TEMPORARY) {
677 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
678 ifap = &ifa->tmp_next) {
679 if (ifa == ifp) {
680 *ifap = ifa->tmp_next;
681 if (ifp->ifpub) {
682 in6_ifa_put(ifp->ifpub);
683 ifp->ifpub = NULL;
684 }
685 __in6_ifa_put(ifp);
686 ifa->tmp_next = NULL;
687 break;
688 }
689 }
690 }
691#endif
692
1d142804 693 for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
1da177e4
LT		 694 if (ifa == ifp) {
695 *ifap = ifa->if_next;
696 __in6_ifa_put(ifp);
697 ifa->if_next = NULL;
698 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
699 break;
700 deleted = 1;
1d142804 701 continue;
1da177e4
LT		 702 } else if (ifp->flags & IFA_F_PERMANENT) {
703 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
704 ifp->prefix_len)) {
705 if (ifa->flags & IFA_F_PERMANENT) {
706 onlink = 1;
707 if (deleted)
708 break;
709 } else {
710 unsigned long lifetime;
711
712 if (!onlink)
713 onlink = -1;
714
715 spin_lock(&ifa->lock);
716 lifetime = min_t(unsigned long,
717 ifa->valid_lft, 0x7fffffffUL/HZ);
718 if (time_before(expires,
719 ifa->tstamp + lifetime * HZ))
720 expires = ifa->tstamp + lifetime * HZ;
721 spin_unlock(&ifa->lock);
722 }
723 }
724 }
1d142804 725 ifap = &ifa->if_next;
1da177e4
LT		 726 }
727 write_unlock_bh(&idev->lock);
728
729 ipv6_ifa_notify(RTM_DELADDR, ifp);
730
e041c683 731 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
1da177e4
LT		 732
733 addrconf_del_timer(ifp);
734
735 /*
736 * Purge or update corresponding prefix
737 *
738 * 1) we don't purge prefix here if address was not permanent.
739 * prefix is managed by its own lifetime.
740 * 2) if there're no addresses, delete prefix.
741 * 3) if there're still other permanent address(es),
742 * corresponding prefix is still permanent.
743 * 4) otherwise, update prefix lifetime to the
744 * longest valid lifetime among the corresponding
745 * addresses on the device.
746 * Note: subsequent RA will update lifetime.
747 *
748 * --yoshfuji
749 */
750 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
751 struct in6_addr prefix;
752 struct rt6_info *rt;
753
754 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
755 rt = rt6_lookup(&prefix, NULL, ifp->idev->dev->ifindex, 1);
756
757 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
758 if (onlink == 0) {
e0a1ad73 759 ip6_del_rt(rt);
1da177e4
LT		 760 rt = NULL;
761 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
762 rt->rt6i_expires = expires;
763 rt->rt6i_flags |= RTF_EXPIRES;
764 }
765 }
766 dst_release(&rt->u.dst);
767 }
768
769 in6_ifa_put(ifp);
770}
771
772#ifdef CONFIG_IPV6_PRIVACY
773static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
774{
775 struct inet6_dev *idev = ifp->idev;
776 struct in6_addr addr, *tmpaddr;
777 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
778 int tmp_plen;
779 int ret = 0;
780 int max_addresses;
95c385b4 781 u32 addr_flags;
1da177e4
LT		 782
783 write_lock(&idev->lock);
784 if (ift) {
785 spin_lock_bh(&ift->lock);
786 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
787 spin_unlock_bh(&ift->lock);
788 tmpaddr = &addr;
789 } else {
790 tmpaddr = NULL;
791 }
792retry:
793 in6_dev_hold(idev);
794 if (idev->cnf.use_tempaddr <= 0) {
795 write_unlock(&idev->lock);
796 printk(KERN_INFO
797 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
798 in6_dev_put(idev);
799 ret = -1;
800 goto out;
801 }
802 spin_lock_bh(&ifp->lock);
803 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
804 idev->cnf.use_tempaddr = -1; /*XXX*/
805 spin_unlock_bh(&ifp->lock);
806 write_unlock(&idev->lock);
807 printk(KERN_WARNING
808 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
809 in6_dev_put(idev);
810 ret = -1;
811 goto out;
812 }
813 in6_ifa_hold(ifp);
814 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
815 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
816 spin_unlock_bh(&ifp->lock);
817 write_unlock(&idev->lock);
818 printk(KERN_WARNING
819 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
820 in6_ifa_put(ifp);
821 in6_dev_put(idev);
822 ret = -1;
823 goto out;
824 }
825 memcpy(&addr.s6_addr[8], idev->rndid, 8);
826 tmp_valid_lft = min_t(__u32,
827 ifp->valid_lft,
828 idev->cnf.temp_valid_lft);
1ab1457c
YH		 829 tmp_prefered_lft = min_t(__u32,
830 ifp->prefered_lft,
1da177e4
LT		 831 idev->cnf.temp_prefered_lft - desync_factor / HZ);
832 tmp_plen = ifp->prefix_len;
833 max_addresses = idev->cnf.max_addresses;
834 tmp_cstamp = ifp->cstamp;
835 tmp_tstamp = ifp->tstamp;
836 spin_unlock_bh(&ifp->lock);
837
838 write_unlock(&idev->lock);
95c385b4
NH		 839
840 addr_flags = IFA_F_TEMPORARY;
841 /* set in addrconf_prefix_rcv() */
842 if (ifp->flags & IFA_F_OPTIMISTIC)
843 addr_flags |= IFA_F_OPTIMISTIC;
844
1da177e4 845 ift = !max_addresses ||
1ab1457c 846 ipv6_count_addresses(idev) < max_addresses ?
1da177e4 847 ipv6_add_addr(idev, &addr, tmp_plen,
95c385b4
NH		 848 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
849 addr_flags) : NULL;
1da177e4
LT		 850 if (!ift || IS_ERR(ift)) {
851 in6_ifa_put(ifp);
852 in6_dev_put(idev);
853 printk(KERN_INFO
854 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
855 tmpaddr = &addr;
856 write_lock(&idev->lock);
857 goto retry;
858 }
859
860 spin_lock_bh(&ift->lock);
861 ift->ifpub = ifp;
862 ift->valid_lft = tmp_valid_lft;
863 ift->prefered_lft = tmp_prefered_lft;
864 ift->cstamp = tmp_cstamp;
865 ift->tstamp = tmp_tstamp;
866 spin_unlock_bh(&ift->lock);
867
868 addrconf_dad_start(ift, 0);
869 in6_ifa_put(ift);
870 in6_dev_put(idev);
871out:
872 return ret;
873}
874#endif
875
876/*
072047e4 877 * Choose an appropriate source address (RFC3484)
1da177e4 878 */
072047e4
YH		 879struct ipv6_saddr_score {
880 int addr_type;
881 unsigned int attrs;
882 int matchlen;
0d27b427 883 int scope;
072047e4
YH		 884 unsigned int rule;
885};
886
887#define IPV6_SADDR_SCORE_LOCAL 0x0001
888#define IPV6_SADDR_SCORE_PREFERRED 0x0004
889#define IPV6_SADDR_SCORE_HOA 0x0008
890#define IPV6_SADDR_SCORE_OIF 0x0010
891#define IPV6_SADDR_SCORE_LABEL 0x0020
892#define IPV6_SADDR_SCORE_PRIVACY 0x0040
893
b6f99a21 894static inline int ipv6_saddr_preferred(int type)
1da177e4 895{
072047e4
YH		 896 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
897 IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
898 return 1;
899 return 0;
1da177e4
LT		 900}
901
072047e4 902int ipv6_dev_get_saddr(struct net_device *daddr_dev,
1da177e4
LT		 903 struct in6_addr *daddr, struct in6_addr *saddr)
904{
072047e4
YH		 905 struct ipv6_saddr_score hiscore;
906 struct inet6_ifaddr *ifa_result = NULL;
907 int daddr_type = __ipv6_addr_type(daddr);
908 int daddr_scope = __ipv6_addr_src_scope(daddr_type);
303065a8
YH		 909 int daddr_ifindex = daddr_dev ? daddr_dev->ifindex : 0;
910 u32 daddr_label = ipv6_addr_label(daddr, daddr_type, daddr_ifindex);
072047e4 911 struct net_device *dev;
1da177e4 912
072047e4 913 memset(&hiscore, 0, sizeof(hiscore));
1da177e4 914
072047e4 915 read_lock(&dev_base_lock);
8814c4b5 916 rcu_read_lock();
1da177e4 917
881d966b 918 for_each_netdev(&init_net, dev) {
072047e4
YH		 919 struct inet6_dev *idev;
920 struct inet6_ifaddr *ifa;
921
922 /* Rule 0: Candidate Source Address (section 4)
923 * - multicast and link-local destination address,
924 * the set of candidate source address MUST only
925 * include addresses assigned to interfaces
926 * belonging to the same link as the outgoing
927 * interface.
928 * (- For site-local destination addresses, the
929 * set of candidate source addresses MUST only
930 * include addresses assigned to interfaces
931 * belonging to the same site as the outgoing
932 * interface.)
933 */
934 if ((daddr_type & IPV6_ADDR_MULTICAST ||
935 daddr_scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
936 daddr_dev && dev != daddr_dev)
937 continue;
1da177e4 938
1da177e4 939 idev = __in6_dev_get(dev);
072047e4
YH		 940 if (!idev)
941 continue;
942
943 read_lock_bh(&idev->lock);
944 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
945 struct ipv6_saddr_score score;
946
947 score.addr_type = __ipv6_addr_type(&ifa->addr);
948
6b3ae80a
YH		 949 /* Rule 0:
950 * - Tentative Address (RFC2462 section 5.4)
951 * - A tentative address is not considered
952 * "assigned to an interface" in the traditional
95c385b4 953 * sense, unless it is also flagged as optimistic.
6b3ae80a 954 * - Candidate Source Address (section 4)
072047e4
YH		 955 * - In any case, anycast addresses, multicast
956 * addresses, and the unspecified address MUST
957 * NOT be included in a candidate set.
958 */
95c385b4
NH		 959 if ((ifa->flags & IFA_F_TENTATIVE) &&
960 (!(ifa->flags & IFA_F_OPTIMISTIC)))
6b3ae80a 961 continue;
072047e4
YH		 962 if (unlikely(score.addr_type == IPV6_ADDR_ANY ||
963 score.addr_type & IPV6_ADDR_MULTICAST)) {
964 LIMIT_NETDEBUG(KERN_DEBUG
3b6d821c 965 "ADDRCONF: unspecified / multicast address "
072047e4
YH		 966 "assigned as unicast address on %s",
967 dev->name);
968 continue;
969 }
970
971 score.attrs = 0;
972 score.matchlen = 0;
973 score.scope = 0;
974 score.rule = 0;
975
976 if (ifa_result == NULL) {
977 /* record it if the first available entry */
978 goto record_it;
979 }
980
981 /* Rule 1: Prefer same address */
982 if (hiscore.rule < 1) {
983 if (ipv6_addr_equal(&ifa_result->addr, daddr))
984 hiscore.attrs |= IPV6_SADDR_SCORE_LOCAL;
985 hiscore.rule++;
986 }
987 if (ipv6_addr_equal(&ifa->addr, daddr)) {
988 score.attrs |= IPV6_SADDR_SCORE_LOCAL;
989 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)) {
990 score.rule = 1;
991 goto record_it;
1da177e4 992 }
072047e4
YH		 993 } else {
994 if (hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)
995 continue;
1da177e4 996 }
1da177e4 997
072047e4
YH		 998 /* Rule 2: Prefer appropriate scope */
999 if (hiscore.rule < 2) {
1000 hiscore.scope = __ipv6_addr_src_scope(hiscore.addr_type);
1001 hiscore.rule++;
1002 }
1003 score.scope = __ipv6_addr_src_scope(score.addr_type);
1004 if (hiscore.scope < score.scope) {
1005 if (hiscore.scope < daddr_scope) {
1006 score.rule = 2;
1007 goto record_it;
1008 } else
1009 continue;
1010 } else if (score.scope < hiscore.scope) {
1011 if (score.scope < daddr_scope)
e55ffac6 1012 break; /* addresses sorted by scope */
072047e4
YH		 1013 else {
1014 score.rule = 2;
1015 goto record_it;
1016 }
1017 }
1da177e4 1018
95c385b4 1019 /* Rule 3: Avoid deprecated and optimistic addresses */
072047e4
YH		 1020 if (hiscore.rule < 3) {
1021 if (ipv6_saddr_preferred(hiscore.addr_type) ||
95c385b4
NH		 1022 (((ifa_result->flags &
1023 (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)) == 0)))
072047e4
YH		 1024 hiscore.attrs |= IPV6_SADDR_SCORE_PREFERRED;
1025 hiscore.rule++;
1026 }
1027 if (ipv6_saddr_preferred(score.addr_type) ||
6ae5f983 1028 (((ifa->flags &
95c385b4 1029 (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)) == 0))) {
072047e4
YH		 1030 score.attrs |= IPV6_SADDR_SCORE_PREFERRED;
1031 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)) {
1032 score.rule = 3;
1033 goto record_it;
1034 }
1035 } else {
1036 if (hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)
1037 continue;
1038 }
1da177e4 1039
3b9f9a1c 1040 /* Rule 4: Prefer home address */
59fbb3a6 1041#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3b9f9a1c
NT		 1042 if (hiscore.rule < 4) {
1043 if (ifa_result->flags & IFA_F_HOMEADDRESS)
1044 hiscore.attrs |= IPV6_SADDR_SCORE_HOA;
1045 hiscore.rule++;
1046 }
1047 if (ifa->flags & IFA_F_HOMEADDRESS) {
1048 score.attrs |= IPV6_SADDR_SCORE_HOA;
1049 if (!(ifa_result->flags & IFA_F_HOMEADDRESS)) {
1050 score.rule = 4;
1051 goto record_it;
1052 }
1053 } else {
1054 if (hiscore.attrs & IPV6_SADDR_SCORE_HOA)
1055 continue;
1056 }
1057#else
220bbd74
YH		 1058 if (hiscore.rule < 4)
1059 hiscore.rule++;
3b9f9a1c 1060#endif
072047e4
YH		 1061
1062 /* Rule 5: Prefer outgoing interface */
1063 if (hiscore.rule < 5) {
1064 if (daddr_dev == NULL ||
1065 daddr_dev == ifa_result->idev->dev)
1066 hiscore.attrs |= IPV6_SADDR_SCORE_OIF;
1067 hiscore.rule++;
1068 }
1069 if (daddr_dev == NULL ||
1070 daddr_dev == ifa->idev->dev) {
1071 score.attrs |= IPV6_SADDR_SCORE_OIF;
1072 if (!(hiscore.attrs & IPV6_SADDR_SCORE_OIF)) {
1073 score.rule = 5;
1074 goto record_it;
1075 }
1076 } else {
1077 if (hiscore.attrs & IPV6_SADDR_SCORE_OIF)
1078 continue;
1079 }
1080
1081 /* Rule 6: Prefer matching label */
1082 if (hiscore.rule < 6) {
c1ee656c 1083 if (ipv6_addr_label(&ifa_result->addr,
303065a8
YH		 1084 hiscore.addr_type,
1085 ifa_result->idev->dev->ifindex) == daddr_label)
072047e4
YH		 1086 hiscore.attrs |= IPV6_SADDR_SCORE_LABEL;
1087 hiscore.rule++;
1088 }
c1ee656c 1089 if (ipv6_addr_label(&ifa->addr,
303065a8
YH		 1090 score.addr_type,
1091 ifa->idev->dev->ifindex) == daddr_label) {
072047e4
YH		 1092 score.attrs |= IPV6_SADDR_SCORE_LABEL;
1093 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LABEL)) {
1094 score.rule = 6;
1095 goto record_it;
1da177e4 1096 }
072047e4
YH		 1097 } else {
1098 if (hiscore.attrs & IPV6_SADDR_SCORE_LABEL)
1099 continue;
1100 }
1101
44fd0261 1102#ifdef CONFIG_IPV6_PRIVACY
072047e4
YH		 1103 /* Rule 7: Prefer public address
1104 * Note: prefer temprary address if use_tempaddr >= 2
1105 */
1106 if (hiscore.rule < 7) {
1107 if ((!(ifa_result->flags & IFA_F_TEMPORARY)) ^
1108 (ifa_result->idev->cnf.use_tempaddr >= 2))
1109 hiscore.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1110 hiscore.rule++;
1111 }
1112 if ((!(ifa->flags & IFA_F_TEMPORARY)) ^
1113 (ifa->idev->cnf.use_tempaddr >= 2)) {
1114 score.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1115 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)) {
1116 score.rule = 7;
1117 goto record_it;
1118 }
1119 } else {
1120 if (hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)
1121 continue;
1122 }
5e2707fa
YH		 1123#else
1124 if (hiscore.rule < 7)
1125 hiscore.rule++;
44fd0261 1126#endif
072047e4 1127 /* Rule 8: Use longest matching prefix */
12da2a43 1128 if (hiscore.rule < 8) {
072047e4 1129 hiscore.matchlen = ipv6_addr_diff(&ifa_result->addr, daddr);
12da2a43
YZ		 1130 hiscore.rule++;
1131 }
072047e4
YH		 1132 score.matchlen = ipv6_addr_diff(&ifa->addr, daddr);
1133 if (score.matchlen > hiscore.matchlen) {
1134 score.rule = 8;
1135 goto record_it;
1da177e4 1136 }
072047e4
YH		 1137#if 0
1138 else if (score.matchlen < hiscore.matchlen)
1139 continue;
1140#endif
1141
1142 /* Final Rule: choose first available one */
1143 continue;
1144record_it:
1145 if (ifa_result)
1146 in6_ifa_put(ifa_result);
1147 in6_ifa_hold(ifa);
1148 ifa_result = ifa;
1149 hiscore = score;
1da177e4 1150 }
072047e4 1151 read_unlock_bh(&idev->lock);
1da177e4 1152 }
8814c4b5 1153 rcu_read_unlock();
1da177e4
LT		 1154 read_unlock(&dev_base_lock);
1155
072047e4
YH		 1156 if (!ifa_result)
1157 return -EADDRNOTAVAIL;
1ab1457c 1158
072047e4
YH		 1159 ipv6_addr_copy(saddr, &ifa_result->addr);
1160 in6_ifa_put(ifa_result);
1161 return 0;
1da177e4
LT		 1162}
1163
1164
1165int ipv6_get_saddr(struct dst_entry *dst,
1166 struct in6_addr *daddr, struct in6_addr *saddr)
1167{
7a3025b1 1168 return ipv6_dev_get_saddr(dst ? ip6_dst_idev(dst)->dev : NULL, daddr, saddr);
1da177e4
LT		 1169}
1170
7159039a 1171EXPORT_SYMBOL(ipv6_get_saddr);
1da177e4 1172
95c385b4
NH		 1173int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1174 unsigned char banned_flags)
1da177e4
LT		 1175{
1176 struct inet6_dev *idev;
1177 int err = -EADDRNOTAVAIL;
1178
8814c4b5 1179 rcu_read_lock();
1da177e4
LT		 1180 if ((idev = __in6_dev_get(dev)) != NULL) {
1181 struct inet6_ifaddr *ifp;
1182
1183 read_lock_bh(&idev->lock);
1184 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
95c385b4 1185 if (ifp->scope == IFA_LINK && !(ifp->flags & banned_flags)) {
1da177e4
LT		 1186 ipv6_addr_copy(addr, &ifp->addr);
1187 err = 0;
1188 break;
1189 }
1190 }
1191 read_unlock_bh(&idev->lock);
1192 }
8814c4b5 1193 rcu_read_unlock();
1da177e4
LT		 1194 return err;
1195}
1196
1197static int ipv6_count_addresses(struct inet6_dev *idev)
1198{
1199 int cnt = 0;
1200 struct inet6_ifaddr *ifp;
1201
1202 read_lock_bh(&idev->lock);
1203 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1204 cnt++;
1205 read_unlock_bh(&idev->lock);
1206 return cnt;
1207}
1208
1209int ipv6_chk_addr(struct in6_addr *addr, struct net_device *dev, int strict)
1210{
1211 struct inet6_ifaddr * ifp;
1212 u8 hash = ipv6_addr_hash(addr);
1213
1214 read_lock_bh(&addrconf_hash_lock);
1215 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1216 if (ipv6_addr_equal(&ifp->addr, addr) &&
1217 !(ifp->flags&IFA_F_TENTATIVE)) {
1218 if (dev == NULL || ifp->idev->dev == dev ||
1219 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1220 break;
1221 }
1222 }
1223 read_unlock_bh(&addrconf_hash_lock);
1224 return ifp != NULL;
1225}
1226
7159039a
YH		 1227EXPORT_SYMBOL(ipv6_chk_addr);
1228
1da177e4
LT		 1229static
1230int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev)
1231{
1232 struct inet6_ifaddr * ifp;
1233 u8 hash = ipv6_addr_hash(addr);
1234
1235 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1236 if (ipv6_addr_equal(&ifp->addr, addr)) {
1237 if (dev == NULL || ifp->idev->dev == dev)
1238 break;
1239 }
1240 }
1241 return ifp != NULL;
1242}
1243
1244struct inet6_ifaddr * ipv6_get_ifaddr(struct in6_addr *addr, struct net_device *dev, int strict)
1245{
1246 struct inet6_ifaddr * ifp;
1247 u8 hash = ipv6_addr_hash(addr);
1248
1249 read_lock_bh(&addrconf_hash_lock);
1250 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1251 if (ipv6_addr_equal(&ifp->addr, addr)) {
1252 if (dev == NULL || ifp->idev->dev == dev ||
1253 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1254 in6_ifa_hold(ifp);
1255 break;
1256 }
1257 }
1258 }
1259 read_unlock_bh(&addrconf_hash_lock);
1260
1261 return ifp;
1262}
1263
1264int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1265{
1266 const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
0fa1a53e 1267 const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
82103232
AV		 1268 __be32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
1269 __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1da177e4 1270 int sk_ipv6only = ipv6_only_sock(sk);
463c84b9 1271 int sk2_ipv6only = inet_v6_ipv6only(sk2);
1da177e4
LT		 1272 int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1273 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1274
1275 if (!sk2_rcv_saddr && !sk_ipv6only)
1276 return 1;
1277
1278 if (addr_type2 == IPV6_ADDR_ANY &&
1279 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1280 return 1;
1281
1282 if (addr_type == IPV6_ADDR_ANY &&
1283 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1284 return 1;
1285
1286 if (sk2_rcv_saddr6 &&
1287 ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1288 return 1;
1289
1290 if (addr_type == IPV6_ADDR_MAPPED &&
1291 !sk2_ipv6only &&
1292 (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1293 return 1;
1294
1295 return 0;
1296}
1297
1298/* Gets referenced address, destroys ifaddr */
1299
9f5336e2 1300static void addrconf_dad_stop(struct inet6_ifaddr *ifp)
1da177e4 1301{
1da177e4
LT		 1302 if (ifp->flags&IFA_F_PERMANENT) {
1303 spin_lock_bh(&ifp->lock);
1304 addrconf_del_timer(ifp);
1305 ifp->flags |= IFA_F_TENTATIVE;
1306 spin_unlock_bh(&ifp->lock);
1307 in6_ifa_put(ifp);
1308#ifdef CONFIG_IPV6_PRIVACY
1309 } else if (ifp->flags&IFA_F_TEMPORARY) {
1310 struct inet6_ifaddr *ifpub;
1311 spin_lock_bh(&ifp->lock);
1312 ifpub = ifp->ifpub;
1313 if (ifpub) {
1314 in6_ifa_hold(ifpub);
1315 spin_unlock_bh(&ifp->lock);
1316 ipv6_create_tempaddr(ifpub, ifp);
1317 in6_ifa_put(ifpub);
1318 } else {
1319 spin_unlock_bh(&ifp->lock);
1320 }
1321 ipv6_del_addr(ifp);
1322#endif
1323 } else
1324 ipv6_del_addr(ifp);
1325}
1326
3c21edbd
YH		 1327void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1328{
1329 if (net_ratelimit())
1330 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1331 addrconf_dad_stop(ifp);
1332}
1da177e4
LT		 1333
1334/* Join to solicited addr multicast group. */
1335
1336void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1337{
1338 struct in6_addr maddr;
1339
1340 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1341 return;
1342
1343 addrconf_addr_solict_mult(addr, &maddr);
1344 ipv6_dev_mc_inc(dev, &maddr);
1345}
1346
1347void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1348{
1349 struct in6_addr maddr;
1350
1351 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1352 return;
1353
1354 addrconf_addr_solict_mult(addr, &maddr);
1355 __ipv6_dev_mc_dec(idev, &maddr);
1356}
1357
20380731 1358static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1359{
1360 struct in6_addr addr;
1361 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1362 if (ipv6_addr_any(&addr))
1363 return;
1364 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1365}
1366
20380731 1367static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1368{
1369 struct in6_addr addr;
1370 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1371 if (ipv6_addr_any(&addr))
1372 return;
1373 __ipv6_dev_ac_dec(ifp->idev, &addr);
1374}
1375
073a8e0e
YH		 1376static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1377{
1378 if (dev->addr_len != ETH_ALEN)
1379 return -1;
1380 memcpy(eui, dev->dev_addr, 3);
1381 memcpy(eui + 5, dev->dev_addr + 3, 3);
1382
1383 /*
1384 * The zSeries OSA network cards can be shared among various
1385 * OS instances, but the OSA cards have only one MAC address.
1386 * This leads to duplicate address conflicts in conjunction
1387 * with IPv6 if more than one instance uses the same card.
1388 *
1389 * The driver for these cards can deliver a unique 16-bit
1390 * identifier for each instance sharing the same card. It is
1391 * placed instead of 0xFFFE in the interface identifier. The
1392 * "u" bit of the interface identifier is not inverted in this
1393 * case. Hence the resulting interface identifier has local
1394 * scope according to RFC2373.
1395 */
1396 if (dev->dev_id) {
1397 eui[3] = (dev->dev_id >> 8) & 0xFF;
1398 eui[4] = dev->dev_id & 0xFF;
1399 } else {
1400 eui[3] = 0xFF;
1401 eui[4] = 0xFE;
1402 eui[0] ^= 2;
1403 }
1404 return 0;
1405}
1406
1407static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1408{
1409 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1410 if (dev->addr_len != ARCNET_ALEN)
1411 return -1;
1412 memset(eui, 0, 7);
1413 eui[7] = *(u8*)dev->dev_addr;
1414 return 0;
1415}
1416
1417static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1418{
1419 if (dev->addr_len != INFINIBAND_ALEN)
1420 return -1;
1421 memcpy(eui, dev->dev_addr + 12, 8);
1422 eui[0] |= 2;
1423 return 0;
1424}
1425
1da177e4
LT		 1426static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1427{
1428 switch (dev->type) {
1429 case ARPHRD_ETHER:
1430 case ARPHRD_FDDI:
1431 case ARPHRD_IEEE802_TR:
073a8e0e 1432 return addrconf_ifid_eui48(eui, dev);
1da177e4 1433 case ARPHRD_ARCNET:
073a8e0e 1434 return addrconf_ifid_arcnet(eui, dev);
1da177e4 1435 case ARPHRD_INFINIBAND:
073a8e0e 1436 return addrconf_ifid_infiniband(eui, dev);
c7dc89c0
FT		 1437 case ARPHRD_SIT:
1438 if (dev->priv_flags & IFF_ISATAP)
1439 return ipv6_isatap_eui64(eui, *(__be32 *)dev->dev_addr);
1da177e4
LT		 1440 }
1441 return -1;
1442}
1443
1444static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1445{
1446 int err = -1;
1447 struct inet6_ifaddr *ifp;
1448
1449 read_lock_bh(&idev->lock);
1450 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1451 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1452 memcpy(eui, ifp->addr.s6_addr+8, 8);
1453 err = 0;
1454 break;
1455 }
1456 }
1457 read_unlock_bh(&idev->lock);
1458 return err;
1459}
1460
1461#ifdef CONFIG_IPV6_PRIVACY
1462/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1463static int __ipv6_regen_rndid(struct inet6_dev *idev)
1464{
1da177e4 1465regen:
955189ef 1466 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1da177e4 1467 idev->rndid[0] &= ~0x02;
1da177e4
LT		 1468
1469 /*
1470 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1471 * check if generated address is not inappropriate
1472 *
1473 * - Reserved subnet anycast (RFC 2526)
1474 * 11111101 11....11 1xxxxxxx
c7dc89c0 1475 * - ISATAP (RFC4214) 6.1
1da177e4
LT		 1476 * 00-00-5E-FE-xx-xx-xx-xx
1477 * - value 0
1478 * - XXX: already assigned to an address on the device
1479 */
1ab1457c 1480 if (idev->rndid[0] == 0xfd &&
1da177e4
LT		 1481 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1482 (idev->rndid[7]&0x80))
1483 goto regen;
1484 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1485 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1486 goto regen;
1487 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1488 goto regen;
1489 }
1490
1491 return 0;
1492}
1493
1494static void ipv6_regen_rndid(unsigned long data)
1495{
1496 struct inet6_dev *idev = (struct inet6_dev *) data;
1497 unsigned long expires;
1498
8814c4b5 1499 rcu_read_lock_bh();
1da177e4
LT		 1500 write_lock_bh(&idev->lock);
1501
1502 if (idev->dead)
1503 goto out;
1504
1505 if (__ipv6_regen_rndid(idev) < 0)
1506 goto out;
1ab1457c 1507
1da177e4 1508 expires = jiffies +
1ab1457c 1509 idev->cnf.temp_prefered_lft * HZ -
1da177e4
LT		 1510 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1511 if (time_before(expires, jiffies)) {
1512 printk(KERN_WARNING
1513 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1514 idev->dev->name);
1515 goto out;
1516 }
1517
1518 if (!mod_timer(&idev->regen_timer, expires))
1519 in6_dev_hold(idev);
1520
1521out:
1522 write_unlock_bh(&idev->lock);
8814c4b5 1523 rcu_read_unlock_bh();
1da177e4
LT		 1524 in6_dev_put(idev);
1525}
1526
1527static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1528 int ret = 0;
1529
1530 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1531 ret = __ipv6_regen_rndid(idev);
1532 return ret;
1533}
1534#endif
1535
1536/*
1537 * Add prefix route.
1538 */
1539
1540static void
1541addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
e431b8c0 1542 unsigned long expires, u32 flags)
1da177e4 1543{
86872cb5
TG		 1544 struct fib6_config cfg = {
1545 .fc_table = RT6_TABLE_PREFIX,
1546 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1547 .fc_ifindex = dev->ifindex,
1548 .fc_expires = expires,
1549 .fc_dst_len = plen,
1550 .fc_flags = RTF_UP | flags,
1551 };
1da177e4 1552
86872cb5 1553 ipv6_addr_copy(&cfg.fc_dst, pfx);
1da177e4
LT		 1554
1555 /* Prevent useless cloning on PtP SIT.
1556 This thing is done here expecting that the whole
1557 class of non-broadcast devices need not cloning.
1558 */
0be669bb 1559#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
86872cb5
TG		 1560 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1561 cfg.fc_flags |= RTF_NONEXTHOP;
0be669bb 1562#endif
1da177e4 1563
86872cb5 1564 ip6_route_add(&cfg);
1da177e4
LT		 1565}
1566
1567/* Create "default" multicast route to the interface */
1568
1569static void addrconf_add_mroute(struct net_device *dev)
1570{
86872cb5
TG		 1571 struct fib6_config cfg = {
1572 .fc_table = RT6_TABLE_LOCAL,
1573 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1574 .fc_ifindex = dev->ifindex,
1575 .fc_dst_len = 8,
1576 .fc_flags = RTF_UP,
1577 };
1578
1579 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1580
1581 ip6_route_add(&cfg);
1da177e4
LT		 1582}
1583
0be669bb 1584#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 1585static void sit_route_add(struct net_device *dev)
1586{
86872cb5
TG		 1587 struct fib6_config cfg = {
1588 .fc_table = RT6_TABLE_MAIN,
1589 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1590 .fc_ifindex = dev->ifindex,
1591 .fc_dst_len = 96,
1592 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1593 };
1da177e4
LT		 1594
1595 /* prefix length - 96 bits "::d.d.d.d" */
86872cb5 1596 ip6_route_add(&cfg);
1da177e4 1597}
0be669bb 1598#endif
1da177e4
LT		 1599
1600static void addrconf_add_lroute(struct net_device *dev)
1601{
1602 struct in6_addr addr;
1603
1604 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1605 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1606}
1607
1608static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1609{
1610 struct inet6_dev *idev;
1611
1612 ASSERT_RTNL();
1613
1614 if ((idev = ipv6_find_idev(dev)) == NULL)
1615 return NULL;
1616
1617 /* Add default multicast route */
1618 addrconf_add_mroute(dev);
1619
1620 /* Add link local route */
1621 addrconf_add_lroute(dev);
1622 return idev;
1623}
1624
1625void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1626{
1627 struct prefix_info *pinfo;
1628 __u32 valid_lft;
1629 __u32 prefered_lft;
1630 int addr_type;
1631 unsigned long rt_expires;
1632 struct inet6_dev *in6_dev;
1633
1634 pinfo = (struct prefix_info *) opt;
1ab1457c 1635
1da177e4
LT		 1636 if (len < sizeof(struct prefix_info)) {
1637 ADBG(("addrconf: prefix option too short\n"));
1638 return;
1639 }
1ab1457c 1640
1da177e4
LT		 1641 /*
1642 * Validation checks ([ADDRCONF], page 19)
1643 */
1644
1645 addr_type = ipv6_addr_type(&pinfo->prefix);
1646
1647 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1648 return;
1649
1650 valid_lft = ntohl(pinfo->valid);
1651 prefered_lft = ntohl(pinfo->prefered);
1652
1653 if (prefered_lft > valid_lft) {
1654 if (net_ratelimit())
1655 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1656 return;
1657 }
1658
1659 in6_dev = in6_dev_get(dev);
1660
1661 if (in6_dev == NULL) {
1662 if (net_ratelimit())
1663 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1664 return;
1665 }
1666
1667 /*
1668 * Two things going on here:
1669 * 1) Add routes for on-link prefixes
1670 * 2) Configure prefixes with the auto flag set
1671 */
1672
1673 /* Avoid arithmetic overflow. Really, we could
1674 save rt_expires in seconds, likely valid_lft,
1675 but it would require division in fib gc, that it
1676 not good.
1677 */
1678 if (valid_lft >= 0x7FFFFFFF/HZ)
3dd4bc68 1679 rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ);
1da177e4 1680 else
3dd4bc68
YH		 1681 rt_expires = valid_lft * HZ;
1682
1683 /*
1684 * We convert this (in jiffies) to clock_t later.
1685 * Avoid arithmetic overflow there as well.
1686 * Overflow can happen only if HZ < USER_HZ.
1687 */
1688 if (HZ < USER_HZ && rt_expires > 0x7FFFFFFF / USER_HZ)
1689 rt_expires = 0x7FFFFFFF / USER_HZ;
1da177e4
LT		 1690
1691 if (pinfo->onlink) {
1692 struct rt6_info *rt;
1693 rt = rt6_lookup(&pinfo->prefix, NULL, dev->ifindex, 1);
1694
1695 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
1696 if (rt->rt6i_flags&RTF_EXPIRES) {
1697 if (valid_lft == 0) {
e0a1ad73 1698 ip6_del_rt(rt);
1da177e4
LT		 1699 rt = NULL;
1700 } else {
3dd4bc68 1701 rt->rt6i_expires = jiffies + rt_expires;
1da177e4
LT		 1702 }
1703 }
1704 } else if (valid_lft) {
1705 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
3dd4bc68 1706 dev, jiffies_to_clock_t(rt_expires), RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT);
1da177e4
LT		 1707 }
1708 if (rt)
1709 dst_release(&rt->u.dst);
1710 }
1711
1712 /* Try to figure out our local address for this prefix */
1713
1714 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1715 struct inet6_ifaddr * ifp;
1716 struct in6_addr addr;
1717 int create = 0, update_lft = 0;
1718
1719 if (pinfo->prefix_len == 64) {
1720 memcpy(&addr, &pinfo->prefix, 8);
1721 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1722 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1723 in6_dev_put(in6_dev);
1724 return;
1725 }
1726 goto ok;
1727 }
1728 if (net_ratelimit())
1729 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1730 pinfo->prefix_len);
1731 in6_dev_put(in6_dev);
1732 return;
1733
1734ok:
1735
1736 ifp = ipv6_get_ifaddr(&addr, dev, 1);
1737
1738 if (ifp == NULL && valid_lft) {
1739 int max_addresses = in6_dev->cnf.max_addresses;
95c385b4
NH		 1740 u32 addr_flags = 0;
1741
1742#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1743 if (in6_dev->cnf.optimistic_dad &&
1744 !ipv6_devconf.forwarding)
1745 addr_flags = IFA_F_OPTIMISTIC;
1746#endif
1da177e4
LT		 1747
1748 /* Do not allow to create too much of autoconfigured
1749 * addresses; this would be too easy way to crash kernel.
1750 */
1751 if (!max_addresses ||
1752 ipv6_count_addresses(in6_dev) < max_addresses)
1753 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
95c385b4
NH		 1754 addr_type&IPV6_ADDR_SCOPE_MASK,
1755 addr_flags);
1da177e4
LT		 1756
1757 if (!ifp || IS_ERR(ifp)) {
1758 in6_dev_put(in6_dev);
1759 return;
1760 }
1761
1762 update_lft = create = 1;
1763 ifp->cstamp = jiffies;
1764 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1765 }
1766
1767 if (ifp) {
1768 int flags;
1769 unsigned long now;
1770#ifdef CONFIG_IPV6_PRIVACY
1771 struct inet6_ifaddr *ift;
1772#endif
1773 u32 stored_lft;
1774
1775 /* update lifetime (RFC2462 5.5.3 e) */
1776 spin_lock(&ifp->lock);
1777 now = jiffies;
1778 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1779 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1780 else
1781 stored_lft = 0;
1782 if (!update_lft && stored_lft) {
1783 if (valid_lft > MIN_VALID_LIFETIME ||
1784 valid_lft > stored_lft)
1785 update_lft = 1;
1786 else if (stored_lft <= MIN_VALID_LIFETIME) {
1787 /* valid_lft <= stored_lft is always true */
1788 /* XXX: IPsec */
1789 update_lft = 0;
1790 } else {
1791 valid_lft = MIN_VALID_LIFETIME;
1792 if (valid_lft < prefered_lft)
1793 prefered_lft = valid_lft;
1794 update_lft = 1;
1795 }
1796 }
1797
1798 if (update_lft) {
1799 ifp->valid_lft = valid_lft;
1800 ifp->prefered_lft = prefered_lft;
1801 ifp->tstamp = now;
1802 flags = ifp->flags;
1803 ifp->flags &= ~IFA_F_DEPRECATED;
1804 spin_unlock(&ifp->lock);
1805
1806 if (!(flags&IFA_F_TENTATIVE))
1807 ipv6_ifa_notify(0, ifp);
1808 } else
1809 spin_unlock(&ifp->lock);
1810
1811#ifdef CONFIG_IPV6_PRIVACY
1812 read_lock_bh(&in6_dev->lock);
1813 /* update all temporary addresses in the list */
1814 for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1815 /*
1816 * When adjusting the lifetimes of an existing
1817 * temporary address, only lower the lifetimes.
1818 * Implementations must not increase the
1819 * lifetimes of an existing temporary address
1820 * when processing a Prefix Information Option.
1821 */
1822 spin_lock(&ift->lock);
1823 flags = ift->flags;
1824 if (ift->valid_lft > valid_lft &&
1825 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1826 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1827 if (ift->prefered_lft > prefered_lft &&
1828 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1829 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1830 spin_unlock(&ift->lock);
1831 if (!(flags&IFA_F_TENTATIVE))
1832 ipv6_ifa_notify(0, ift);
1833 }
1834
1835 if (create && in6_dev->cnf.use_tempaddr > 0) {
1836 /*
1837 * When a new public address is created as described in [ADDRCONF],
1838 * also create a new temporary address.
1839 */
1ab1457c 1840 read_unlock_bh(&in6_dev->lock);
1da177e4
LT		 1841 ipv6_create_tempaddr(ifp, NULL);
1842 } else {
1843 read_unlock_bh(&in6_dev->lock);
1844 }
1845#endif
1846 in6_ifa_put(ifp);
1847 addrconf_verify(0);
1848 }
1849 }
1850 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
1851 in6_dev_put(in6_dev);
1852}
1853
1854/*
1855 * Set destination address.
1856 * Special case for SIT interfaces where we create a new "virtual"
1857 * device.
1858 */
1859int addrconf_set_dstaddr(void __user *arg)
1860{
1861 struct in6_ifreq ireq;
1862 struct net_device *dev;
1863 int err = -EINVAL;
1864
1865 rtnl_lock();
1866
1867 err = -EFAULT;
1868 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1869 goto err_exit;
1870
881d966b 1871 dev = __dev_get_by_index(&init_net, ireq.ifr6_ifindex);
1da177e4
LT		 1872
1873 err = -ENODEV;
1874 if (dev == NULL)
1875 goto err_exit;
1876
0be669bb 1877#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 1878 if (dev->type == ARPHRD_SIT) {
1879 struct ifreq ifr;
1880 mm_segment_t oldfs;
1881 struct ip_tunnel_parm p;
1882
1883 err = -EADDRNOTAVAIL;
1884 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
1885 goto err_exit;
1886
1887 memset(&p, 0, sizeof(p));
1888 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
1889 p.iph.saddr = 0;
1890 p.iph.version = 4;
1891 p.iph.ihl = 5;
1892 p.iph.protocol = IPPROTO_IPV6;
1893 p.iph.ttl = 64;
1894 ifr.ifr_ifru.ifru_data = (void __user *)&p;
1895
1896 oldfs = get_fs(); set_fs(KERNEL_DS);
1897 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
1898 set_fs(oldfs);
1899
1900 if (err == 0) {
1901 err = -ENOBUFS;
881d966b 1902 if ((dev = __dev_get_by_name(&init_net, p.name)) == NULL)
1da177e4
LT		 1903 goto err_exit;
1904 err = dev_open(dev);
1905 }
1906 }
0be669bb 1907#endif
1da177e4
LT		 1908
1909err_exit:
1910 rtnl_unlock();
1911 return err;
1912}
1913
1914/*
1915 * Manual configuration of address on an interface
1916 */
0778769d 1917static int inet6_addr_add(int ifindex, struct in6_addr *pfx, int plen,
55ebaef1 1918 __u8 ifa_flags, __u32 prefered_lft, __u32 valid_lft)
1da177e4
LT		 1919{
1920 struct inet6_ifaddr *ifp;
1921 struct inet6_dev *idev;
1922 struct net_device *dev;
1923 int scope;
46d48046 1924 u32 flags = RTF_EXPIRES;
1da177e4
LT		 1925
1926 ASSERT_RTNL();
1ab1457c 1927
0778769d
NT		 1928 /* check the lifetime */
1929 if (!valid_lft || prefered_lft > valid_lft)
1930 return -EINVAL;
1931
881d966b 1932 if ((dev = __dev_get_by_index(&init_net, ifindex)) == NULL)
1da177e4 1933 return -ENODEV;
1ab1457c 1934
1da177e4
LT		 1935 if ((idev = addrconf_add_dev(dev)) == NULL)
1936 return -ENOBUFS;
1937
1938 scope = ipv6_addr_scope(pfx);
1939
46d48046 1940 if (valid_lft == INFINITY_LIFE_TIME) {
0778769d 1941 ifa_flags |= IFA_F_PERMANENT;
46d48046
YH		 1942 flags = 0;
1943 } else if (valid_lft >= 0x7FFFFFFF/HZ)
0778769d
NT		 1944 valid_lft = 0x7FFFFFFF/HZ;
1945
1946 if (prefered_lft == 0)
1947 ifa_flags |= IFA_F_DEPRECATED;
1948 else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
1949 (prefered_lft != INFINITY_LIFE_TIME))
1950 prefered_lft = 0x7FFFFFFF/HZ;
1951
1952 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
1953
1da177e4 1954 if (!IS_ERR(ifp)) {
06aebfb7 1955 spin_lock_bh(&ifp->lock);
0778769d
NT		 1956 ifp->valid_lft = valid_lft;
1957 ifp->prefered_lft = prefered_lft;
1958 ifp->tstamp = jiffies;
06aebfb7 1959 spin_unlock_bh(&ifp->lock);
0778769d 1960
46d48046
YH		 1961 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
1962 jiffies_to_clock_t(valid_lft * HZ), flags);
95c385b4
NH		 1963 /*
1964 * Note that section 3.1 of RFC 4429 indicates
1965 * that the Optimistic flag should not be set for
1966 * manually configured addresses
1967 */
1da177e4
LT		 1968 addrconf_dad_start(ifp, 0);
1969 in6_ifa_put(ifp);
0778769d 1970 addrconf_verify(0);
1da177e4
LT		 1971 return 0;
1972 }
1973
1974 return PTR_ERR(ifp);
1975}
1976
1977static int inet6_addr_del(int ifindex, struct in6_addr *pfx, int plen)
1978{
1979 struct inet6_ifaddr *ifp;
1980 struct inet6_dev *idev;
1981 struct net_device *dev;
1ab1457c 1982
881d966b 1983 if ((dev = __dev_get_by_index(&init_net, ifindex)) == NULL)
1da177e4
LT		 1984 return -ENODEV;
1985
1986 if ((idev = __in6_dev_get(dev)) == NULL)
1987 return -ENXIO;
1988
1989 read_lock_bh(&idev->lock);
1990 for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
1991 if (ifp->prefix_len == plen &&
1992 ipv6_addr_equal(pfx, &ifp->addr)) {
1993 in6_ifa_hold(ifp);
1994 read_unlock_bh(&idev->lock);
1ab1457c 1995
1da177e4
LT		 1996 ipv6_del_addr(ifp);
1997
1998 /* If the last address is deleted administratively,
1999 disable IPv6 on this interface.
2000 */
2001 if (idev->addr_list == NULL)
2002 addrconf_ifdown(idev->dev, 1);
2003 return 0;
2004 }
2005 }
2006 read_unlock_bh(&idev->lock);
2007 return -EADDRNOTAVAIL;
2008}
2009
2010
2011int addrconf_add_ifaddr(void __user *arg)
2012{
2013 struct in6_ifreq ireq;
2014 int err;
1ab1457c 2015
1da177e4
LT		 2016 if (!capable(CAP_NET_ADMIN))
2017 return -EPERM;
1ab1457c 2018
1da177e4
LT		 2019 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2020 return -EFAULT;
2021
2022 rtnl_lock();
0778769d 2023 err = inet6_addr_add(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen,
55ebaef1 2024 IFA_F_PERMANENT, INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4
LT		 2025 rtnl_unlock();
2026 return err;
2027}
2028
2029int addrconf_del_ifaddr(void __user *arg)
2030{
2031 struct in6_ifreq ireq;
2032 int err;
1ab1457c 2033
1da177e4
LT		 2034 if (!capable(CAP_NET_ADMIN))
2035 return -EPERM;
2036
2037 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2038 return -EFAULT;
2039
2040 rtnl_lock();
2041 err = inet6_addr_del(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
2042 rtnl_unlock();
2043 return err;
2044}
2045
0be669bb 2046#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2047static void sit_add_v4_addrs(struct inet6_dev *idev)
2048{
2049 struct inet6_ifaddr * ifp;
2050 struct in6_addr addr;
2051 struct net_device *dev;
2052 int scope;
2053
2054 ASSERT_RTNL();
2055
2056 memset(&addr, 0, sizeof(struct in6_addr));
2057 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2058
2059 if (idev->dev->flags&IFF_POINTOPOINT) {
2060 addr.s6_addr32[0] = htonl(0xfe800000);
2061 scope = IFA_LINK;
2062 } else {
2063 scope = IPV6_ADDR_COMPATv4;
2064 }
2065
2066 if (addr.s6_addr32[3]) {
2067 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
2068 if (!IS_ERR(ifp)) {
2069 spin_lock_bh(&ifp->lock);
2070 ifp->flags &= ~IFA_F_TENTATIVE;
2071 spin_unlock_bh(&ifp->lock);
2072 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2073 in6_ifa_put(ifp);
2074 }
2075 return;
2076 }
2077
881d966b 2078 for_each_netdev(&init_net, dev) {
e5ed6399 2079 struct in_device * in_dev = __in_dev_get_rtnl(dev);
1da177e4
LT		 2080 if (in_dev && (dev->flags & IFF_UP)) {
2081 struct in_ifaddr * ifa;
2082
2083 int flag = scope;
2084
2085 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2086 int plen;
2087
2088 addr.s6_addr32[3] = ifa->ifa_local;
2089
2090 if (ifa->ifa_scope == RT_SCOPE_LINK)
2091 continue;
2092 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2093 if (idev->dev->flags&IFF_POINTOPOINT)
2094 continue;
2095 flag |= IFA_HOST;
2096 }
2097 if (idev->dev->flags&IFF_POINTOPOINT)
2098 plen = 64;
2099 else
2100 plen = 96;
2101
2102 ifp = ipv6_add_addr(idev, &addr, plen, flag,
2103 IFA_F_PERMANENT);
2104 if (!IS_ERR(ifp)) {
2105 spin_lock_bh(&ifp->lock);
2106 ifp->flags &= ~IFA_F_TENTATIVE;
2107 spin_unlock_bh(&ifp->lock);
2108 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2109 in6_ifa_put(ifp);
2110 }
2111 }
2112 }
1ab1457c 2113 }
1da177e4 2114}
0be669bb 2115#endif
1da177e4
LT		 2116
2117static void init_loopback(struct net_device *dev)
2118{
2119 struct inet6_dev *idev;
2120 struct inet6_ifaddr * ifp;
2121
2122 /* ::1 */
2123
2124 ASSERT_RTNL();
2125
2126 if ((idev = ipv6_find_idev(dev)) == NULL) {
2127 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2128 return;
2129 }
2130
2131 ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
2132 if (!IS_ERR(ifp)) {
2133 spin_lock_bh(&ifp->lock);
2134 ifp->flags &= ~IFA_F_TENTATIVE;
2135 spin_unlock_bh(&ifp->lock);
2136 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2137 in6_ifa_put(ifp);
2138 }
2139}
2140
2141static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2142{
2143 struct inet6_ifaddr * ifp;
95c385b4
NH		 2144 u32 addr_flags = IFA_F_PERMANENT;
2145
2146#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2147 if (idev->cnf.optimistic_dad &&
2148 !ipv6_devconf.forwarding)
2149 addr_flags |= IFA_F_OPTIMISTIC;
2150#endif
1da177e4 2151
95c385b4
NH		 2152
2153 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
1da177e4 2154 if (!IS_ERR(ifp)) {
46d48046 2155 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
1da177e4
LT		 2156 addrconf_dad_start(ifp, 0);
2157 in6_ifa_put(ifp);
2158 }
2159}
2160
2161static void addrconf_dev_config(struct net_device *dev)
2162{
2163 struct in6_addr addr;
2164 struct inet6_dev * idev;
2165
2166 ASSERT_RTNL();
2167
74235a25
HX		 2168 if ((dev->type != ARPHRD_ETHER) &&
2169 (dev->type != ARPHRD_FDDI) &&
2170 (dev->type != ARPHRD_IEEE802_TR) &&
2171 (dev->type != ARPHRD_ARCNET) &&
2172 (dev->type != ARPHRD_INFINIBAND)) {
2173 /* Alas, we support only Ethernet autoconfiguration. */
2174 return;
2175 }
2176
1da177e4
LT		 2177 idev = addrconf_add_dev(dev);
2178 if (idev == NULL)
2179 return;
2180
2181 memset(&addr, 0, sizeof(struct in6_addr));
2182 addr.s6_addr32[0] = htonl(0xFE800000);
2183
2184 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2185 addrconf_add_linklocal(idev, &addr);
2186}
2187
0be669bb 2188#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2189static void addrconf_sit_config(struct net_device *dev)
2190{
2191 struct inet6_dev *idev;
2192
2193 ASSERT_RTNL();
2194
1ab1457c
YH		 2195 /*
2196 * Configure the tunnel with one of our IPv4
2197 * addresses... we should configure all of
1da177e4
LT		 2198 * our v4 addrs in the tunnel
2199 */
2200
2201 if ((idev = ipv6_find_idev(dev)) == NULL) {
2202 printk(KERN_DEBUG "init sit: add_dev failed\n");
2203 return;
2204 }
2205
c7dc89c0
FT		 2206 if (dev->priv_flags & IFF_ISATAP) {
2207 struct in6_addr addr;
2208
2209 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2210 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2211 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2212 addrconf_add_linklocal(idev, &addr);
2213 return;
2214 }
2215
1da177e4
LT		 2216 sit_add_v4_addrs(idev);
2217
2218 if (dev->flags&IFF_POINTOPOINT) {
2219 addrconf_add_mroute(dev);
2220 addrconf_add_lroute(dev);
2221 } else
2222 sit_route_add(dev);
2223}
0be669bb 2224#endif
1da177e4
LT		 2225
2226static inline int
2227ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2228{
2229 struct in6_addr lladdr;
2230
95c385b4 2231 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
1da177e4
LT		 2232 addrconf_add_linklocal(idev, &lladdr);
2233 return 0;
2234 }
2235 return -1;
2236}
2237
2238static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2239{
2240 struct net_device *link_dev;
2241
2242 /* first try to inherit the link-local address from the link device */
2243 if (idev->dev->iflink &&
881d966b 2244 (link_dev = __dev_get_by_index(&init_net, idev->dev->iflink))) {
1da177e4
LT		 2245 if (!ipv6_inherit_linklocal(idev, link_dev))
2246 return;
2247 }
2248 /* then try to inherit it from any device */
881d966b 2249 for_each_netdev(&init_net, link_dev) {
1da177e4
LT		 2250 if (!ipv6_inherit_linklocal(idev, link_dev))
2251 return;
2252 }
2253 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2254}
2255
2256/*
2257 * Autoconfigure tunnel with a link-local address so routing protocols,
2258 * DHCPv6, MLD etc. can be run over the virtual link
2259 */
2260
2261static void addrconf_ip6_tnl_config(struct net_device *dev)
2262{
2263 struct inet6_dev *idev;
2264
2265 ASSERT_RTNL();
2266
2267 if ((idev = addrconf_add_dev(dev)) == NULL) {
2268 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2269 return;
2270 }
2271 ip6_tnl_add_linklocal(idev);
1da177e4
LT		 2272}
2273
1ab1457c 2274static int addrconf_notify(struct notifier_block *this, unsigned long event,
1da177e4
LT		 2275 void * data)
2276{
2277 struct net_device *dev = (struct net_device *) data;
74235a25 2278 struct inet6_dev *idev = __in6_dev_get(dev);
c5e33bdd 2279 int run_pending = 0;
b217d616 2280 int err;
1da177e4 2281
e9dc8653
EB		 2282 if (dev->nd_net != &init_net)
2283 return NOTIFY_DONE;
2284
1da177e4 2285 switch(event) {
45ba9dd2 2286 case NETDEV_REGISTER:
74235a25 2287 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
45ba9dd2
YH		 2288 idev = ipv6_add_dev(dev);
2289 if (!idev)
b217d616 2290 return notifier_from_errno(-ENOMEM);
45ba9dd2
YH		 2291 }
2292 break;
1da177e4 2293 case NETDEV_UP:
3c21edbd 2294 case NETDEV_CHANGE:
c2edacf8
JV		 2295 if (dev->flags & IFF_SLAVE)
2296 break;
2297
3c21edbd 2298 if (event == NETDEV_UP) {
f24e3d65 2299 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 2300 /* device is not ready yet. */
2301 printk(KERN_INFO
2302 "ADDRCONF(NETDEV_UP): %s: "
2303 "link is not ready\n",
2304 dev->name);
2305 break;
2306 }
99081049 2307
d31c7b8f
EP		 2308 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2309 idev = ipv6_add_dev(dev);
2310
99081049
KS		 2311 if (idev)
2312 idev->if_flags |= IF_READY;
3c21edbd 2313 } else {
f24e3d65 2314 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 2315 /* device is still not ready. */
2316 break;
2317 }
2318
2319 if (idev) {
2320 if (idev->if_flags & IF_READY) {
2321 /* device is already configured. */
2322 break;
2323 }
2324 idev->if_flags |= IF_READY;
2325 }
2326
2327 printk(KERN_INFO
2328 "ADDRCONF(NETDEV_CHANGE): %s: "
2329 "link becomes ready\n",
2330 dev->name);
2331
c5e33bdd 2332 run_pending = 1;
3c21edbd
YH		 2333 }
2334
1da177e4 2335 switch(dev->type) {
0be669bb 2336#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2337 case ARPHRD_SIT:
2338 addrconf_sit_config(dev);
2339 break;
0be669bb 2340#endif
1da177e4
LT		 2341 case ARPHRD_TUNNEL6:
2342 addrconf_ip6_tnl_config(dev);
2343 break;
2344 case ARPHRD_LOOPBACK:
2345 init_loopback(dev);
2346 break;
2347
2348 default:
2349 addrconf_dev_config(dev);
2350 break;
3ff50b79 2351 }
1da177e4 2352 if (idev) {
c5e33bdd
YH		 2353 if (run_pending)
2354 addrconf_dad_run(idev);
2355
1da177e4
LT		 2356 /* If the MTU changed during the interface down, when the
2357 interface up, the changed MTU must be reflected in the
2358 idev as well as routers.
2359 */
2360 if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2361 rt6_mtu_change(dev, dev->mtu);
2362 idev->cnf.mtu6 = dev->mtu;
2363 }
2364 idev->tstamp = jiffies;
2365 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2366 /* If the changed mtu during down is lower than IPV6_MIN_MTU
2367 stop IPv6 on this interface.
2368 */
2369 if (dev->mtu < IPV6_MIN_MTU)
2370 addrconf_ifdown(dev, event != NETDEV_DOWN);
2371 }
2372 break;
2373
2374 case NETDEV_CHANGEMTU:
d31c7b8f 2375 if (idev && dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 2376 rt6_mtu_change(dev, dev->mtu);
2377 idev->cnf.mtu6 = dev->mtu;
2378 break;
2379 }
2380
d31c7b8f
EP		 2381 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2382 idev = ipv6_add_dev(dev);
2383 if (idev)
2384 break;
2385 }
2386
1da177e4
LT		 2387 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2388
2389 case NETDEV_DOWN:
2390 case NETDEV_UNREGISTER:
2391 /*
2392 * Remove all addresses from this interface.
2393 */
2394 addrconf_ifdown(dev, event != NETDEV_DOWN);
2395 break;
3c21edbd 2396
1da177e4 2397 case NETDEV_CHANGENAME:
1da177e4 2398 if (idev) {
5632c515 2399 snmp6_unregister_dev(idev);
408c4768 2400 addrconf_sysctl_unregister(idev);
f52295a9 2401 addrconf_sysctl_register(idev);
b217d616
HX		 2402 err = snmp6_register_dev(idev);
2403 if (err)
2404 return notifier_from_errno(err);
5632c515 2405 }
1da177e4 2406 break;
3ff50b79 2407 }
1da177e4
LT		 2408
2409 return NOTIFY_OK;
2410}
2411
2412/*
2413 * addrconf module should be notified of a device going up
2414 */
2415static struct notifier_block ipv6_dev_notf = {
2416 .notifier_call = addrconf_notify,
2417 .priority = 0
2418};
2419
2420static int addrconf_ifdown(struct net_device *dev, int how)
2421{
2422 struct inet6_dev *idev;
2423 struct inet6_ifaddr *ifa, **bifa;
2424 int i;
2425
2426 ASSERT_RTNL();
2427
2774c7ab 2428 if (dev == init_net.loopback_dev && how == 1)
1da177e4
LT		 2429 how = 0;
2430
2431 rt6_ifdown(dev);
2432 neigh_ifdown(&nd_tbl, dev);
2433
2434 idev = __in6_dev_get(dev);
2435 if (idev == NULL)
2436 return -ENODEV;
2437
2438 /* Step 1: remove reference to ipv6 device from parent device.
1ab1457c 2439 Do not dev_put!
1da177e4
LT		 2440 */
2441 if (how == 1) {
1da177e4 2442 idev->dead = 1;
8814c4b5
YH		 2443
2444 /* protected by rtnl_lock */
2445 rcu_assign_pointer(dev->ip6_ptr, NULL);
1da177e4
LT		 2446
2447 /* Step 1.5: remove snmp6 entry */
2448 snmp6_unregister_dev(idev);
2449
2450 }
2451
2452 /* Step 2: clear hash table */
2453 for (i=0; i<IN6_ADDR_HSIZE; i++) {
2454 bifa = &inet6_addr_lst[i];
2455
2456 write_lock_bh(&addrconf_hash_lock);
2457 while ((ifa = *bifa) != NULL) {
2458 if (ifa->idev == idev) {
2459 *bifa = ifa->lst_next;
2460 ifa->lst_next = NULL;
2461 addrconf_del_timer(ifa);
2462 in6_ifa_put(ifa);
2463 continue;
2464 }
2465 bifa = &ifa->lst_next;
2466 }
2467 write_unlock_bh(&addrconf_hash_lock);
2468 }
2469
2470 write_lock_bh(&idev->lock);
2471
2472 /* Step 3: clear flags for stateless addrconf */
2473 if (how != 1)
3c21edbd 2474 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4
LT		 2475
2476 /* Step 4: clear address list */
2477#ifdef CONFIG_IPV6_PRIVACY
2478 if (how == 1 && del_timer(&idev->regen_timer))
2479 in6_dev_put(idev);
2480
2481 /* clear tempaddr list */
2482 while ((ifa = idev->tempaddr_list) != NULL) {
2483 idev->tempaddr_list = ifa->tmp_next;
2484 ifa->tmp_next = NULL;
2485 ifa->dead = 1;
2486 write_unlock_bh(&idev->lock);
2487 spin_lock_bh(&ifa->lock);
2488
2489 if (ifa->ifpub) {
2490 in6_ifa_put(ifa->ifpub);
2491 ifa->ifpub = NULL;
2492 }
2493 spin_unlock_bh(&ifa->lock);
2494 in6_ifa_put(ifa);
2495 write_lock_bh(&idev->lock);
2496 }
2497#endif
2498 while ((ifa = idev->addr_list) != NULL) {
2499 idev->addr_list = ifa->if_next;
2500 ifa->if_next = NULL;
2501 ifa->dead = 1;
2502 addrconf_del_timer(ifa);
2503 write_unlock_bh(&idev->lock);
2504
2505 __ipv6_ifa_notify(RTM_DELADDR, ifa);
063ed369 2506 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
1da177e4
LT		 2507 in6_ifa_put(ifa);
2508
2509 write_lock_bh(&idev->lock);
2510 }
2511 write_unlock_bh(&idev->lock);
2512
2513 /* Step 5: Discard multicast list */
2514
2515 if (how == 1)
2516 ipv6_mc_destroy_dev(idev);
2517 else
2518 ipv6_mc_down(idev);
2519
1da177e4 2520 idev->tstamp = jiffies;
1ab1457c 2521
1da177e4
LT		 2522 /* Shot the device (if unregistered) */
2523
2524 if (how == 1) {
408c4768 2525 addrconf_sysctl_unregister(idev);
1da177e4
LT		 2526 neigh_parms_release(&nd_tbl, idev->nd_parms);
2527 neigh_ifdown(&nd_tbl, dev);
2528 in6_dev_put(idev);
2529 }
2530 return 0;
2531}
2532
2533static void addrconf_rs_timer(unsigned long data)
2534{
2535 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2536
2537 if (ifp->idev->cnf.forwarding)
2538 goto out;
2539
2540 if (ifp->idev->if_flags & IF_RA_RCVD) {
2541 /*
2542 * Announcement received after solicitation
2543 * was sent
2544 */
2545 goto out;
2546 }
2547
2548 spin_lock(&ifp->lock);
2549 if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2550 struct in6_addr all_routers;
2551
2552 /* The wait after the last probe can be shorter */
2553 addrconf_mod_timer(ifp, AC_RS,
2554 (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2555 ifp->idev->cnf.rtr_solicit_delay :
2556 ifp->idev->cnf.rtr_solicit_interval);
2557 spin_unlock(&ifp->lock);
2558
2559 ipv6_addr_all_routers(&all_routers);
2560
2561 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2562 } else {
2563 spin_unlock(&ifp->lock);
2564 /*
2565 * Note: we do not support deprecated "all on-link"
2566 * assumption any longer.
2567 */
2568 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2569 ifp->idev->dev->name);
2570 }
2571
2572out:
2573 in6_ifa_put(ifp);
2574}
2575
2576/*
2577 * Duplicate Address Detection
2578 */
3c21edbd
YH		 2579static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2580{
2581 unsigned long rand_num;
2582 struct inet6_dev *idev = ifp->idev;
2583
95c385b4
NH		 2584 if (ifp->flags & IFA_F_OPTIMISTIC)
2585 rand_num = 0;
2586 else
2587 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2588
3c21edbd
YH		 2589 ifp->probes = idev->cnf.dad_transmits;
2590 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2591}
2592
e431b8c0 2593static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
1da177e4
LT		 2594{
2595 struct inet6_dev *idev = ifp->idev;
2596 struct net_device *dev = idev->dev;
1da177e4
LT		 2597
2598 addrconf_join_solict(dev, &ifp->addr);
2599
1da177e4 2600 net_srandom(ifp->addr.s6_addr32[3]);
1da177e4
LT		 2601
2602 read_lock_bh(&idev->lock);
2603 if (ifp->dead)
2604 goto out;
2605 spin_lock_bh(&ifp->lock);
2606
2607 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
55ebaef1
NT		 2608 !(ifp->flags&IFA_F_TENTATIVE) ||
2609 ifp->flags & IFA_F_NODAD) {
95c385b4 2610 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
1da177e4
LT		 2611 spin_unlock_bh(&ifp->lock);
2612 read_unlock_bh(&idev->lock);
2613
2614 addrconf_dad_completed(ifp);
2615 return;
2616 }
2617
6732bade 2618 if (!(idev->if_flags & IF_READY)) {
3dd3bf83 2619 spin_unlock_bh(&ifp->lock);
6732bade 2620 read_unlock_bh(&idev->lock);
3c21edbd
YH		 2621 /*
2622 * If the defice is not ready:
2623 * - keep it tentative if it is a permanent address.
2624 * - otherwise, kill it.
2625 */
2626 in6_ifa_hold(ifp);
2627 addrconf_dad_stop(ifp);
6732bade 2628 return;
3c21edbd 2629 }
95c385b4
NH		 2630
2631 /*
2632 * Optimistic nodes can start receiving
2633 * Frames right away
2634 */
2635 if(ifp->flags & IFA_F_OPTIMISTIC)
2636 ip6_ins_rt(ifp->rt);
2637
6732bade
YH		 2638 addrconf_dad_kick(ifp);
2639 spin_unlock_bh(&ifp->lock);
1da177e4
LT		 2640out:
2641 read_unlock_bh(&idev->lock);
2642}
2643
2644static void addrconf_dad_timer(unsigned long data)
2645{
2646 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2647 struct inet6_dev *idev = ifp->idev;
2648 struct in6_addr unspec;
2649 struct in6_addr mcaddr;
2650
2651 read_lock_bh(&idev->lock);
2652 if (idev->dead) {
2653 read_unlock_bh(&idev->lock);
2654 goto out;
2655 }
2656 spin_lock_bh(&ifp->lock);
2657 if (ifp->probes == 0) {
2658 /*
2659 * DAD was successful
2660 */
2661
95c385b4 2662 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
1da177e4
LT		 2663 spin_unlock_bh(&ifp->lock);
2664 read_unlock_bh(&idev->lock);
2665
2666 addrconf_dad_completed(ifp);
2667
2668 goto out;
2669 }
2670
2671 ifp->probes--;
2672 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2673 spin_unlock_bh(&ifp->lock);
2674 read_unlock_bh(&idev->lock);
2675
2676 /* send a neighbour solicitation for our addr */
2677 memset(&unspec, 0, sizeof(unspec));
2678 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2679 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec);
2680out:
2681 in6_ifa_put(ifp);
2682}
2683
2684static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2685{
2686 struct net_device * dev = ifp->idev->dev;
2687
2688 /*
2689 * Configure the address for reception. Now it is valid.
2690 */
2691
2692 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2693
2694 /* If added prefix is link local and forwarding is off,
2695 start sending router solicitations.
2696 */
2697
2698 if (ifp->idev->cnf.forwarding == 0 &&
2699 ifp->idev->cnf.rtr_solicits > 0 &&
2700 (dev->flags&IFF_LOOPBACK) == 0 &&
2701 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2702 struct in6_addr all_routers;
2703
2704 ipv6_addr_all_routers(&all_routers);
2705
2706 /*
2707 * If a host as already performed a random delay
2708 * [...] as part of DAD [...] there is no need
2709 * to delay again before sending the first RS
2710 */
2711 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2712
2713 spin_lock_bh(&ifp->lock);
2714 ifp->probes = 1;
2715 ifp->idev->if_flags |= IF_RS_SENT;
2716 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2717 spin_unlock_bh(&ifp->lock);
2718 }
2719}
2720
c5e33bdd
YH		 2721static void addrconf_dad_run(struct inet6_dev *idev) {
2722 struct inet6_ifaddr *ifp;
2723
2724 read_lock_bh(&idev->lock);
2725 for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2726 spin_lock_bh(&ifp->lock);
2727 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2728 spin_unlock_bh(&ifp->lock);
2729 continue;
2730 }
2731 spin_unlock_bh(&ifp->lock);
2732 addrconf_dad_kick(ifp);
2733 }
2734 read_unlock_bh(&idev->lock);
2735}
2736
1da177e4
LT		 2737#ifdef CONFIG_PROC_FS
2738struct if6_iter_state {
2739 int bucket;
2740};
2741
2742static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2743{
2744 struct inet6_ifaddr *ifa = NULL;
2745 struct if6_iter_state *state = seq->private;
2746
2747 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2748 ifa = inet6_addr_lst[state->bucket];
2749 if (ifa)
2750 break;
2751 }
2752 return ifa;
2753}
2754
2755static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2756{
2757 struct if6_iter_state *state = seq->private;
2758
2759 ifa = ifa->lst_next;
2760try_again:
2761 if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2762 ifa = inet6_addr_lst[state->bucket];
2763 goto try_again;
2764 }
2765 return ifa;
2766}
2767
2768static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2769{
2770 struct inet6_ifaddr *ifa = if6_get_first(seq);
2771
2772 if (ifa)
2773 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2774 --pos;
2775 return pos ? NULL : ifa;
2776}
2777
2778static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2779{
2780 read_lock_bh(&addrconf_hash_lock);
2781 return if6_get_idx(seq, *pos);
2782}
2783
2784static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2785{
2786 struct inet6_ifaddr *ifa;
2787
2788 ifa = if6_get_next(seq, v);
2789 ++*pos;
2790 return ifa;
2791}
2792
2793static void if6_seq_stop(struct seq_file *seq, void *v)
2794{
2795 read_unlock_bh(&addrconf_hash_lock);
2796}
2797
2798static int if6_seq_show(struct seq_file *seq, void *v)
2799{
2800 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2801 seq_printf(seq,
9343e79a 2802 NIP6_SEQFMT " %02x %02x %02x %02x %8s\n",
1da177e4
LT		 2803 NIP6(ifp->addr),
2804 ifp->idev->dev->ifindex,
2805 ifp->prefix_len,
2806 ifp->scope,
2807 ifp->flags,
2808 ifp->idev->dev->name);
2809 return 0;
2810}
2811
56b3d975 2812static const struct seq_operations if6_seq_ops = {
1da177e4
LT		 2813 .start = if6_seq_start,
2814 .next = if6_seq_next,
2815 .show = if6_seq_show,
2816 .stop = if6_seq_stop,
2817};
2818
2819static int if6_seq_open(struct inode *inode, struct file *file)
2820{
cf7732e4
PE		 2821 return seq_open_private(file, &if6_seq_ops,
2822 sizeof(struct if6_iter_state));
1da177e4
LT		 2823}
2824
9a32144e 2825static const struct file_operations if6_fops = {
1da177e4
LT		 2826 .owner = THIS_MODULE,
2827 .open = if6_seq_open,
2828 .read = seq_read,
2829 .llseek = seq_lseek,
2830 .release = seq_release_private,
2831};
2832
2833int __init if6_proc_init(void)
2834{
457c4cbc 2835 if (!proc_net_fops_create(&init_net, "if_inet6", S_IRUGO, &if6_fops))
1da177e4
LT		 2836 return -ENOMEM;
2837 return 0;
2838}
2839
2840void if6_proc_exit(void)
2841{
457c4cbc 2842 proc_net_remove(&init_net, "if_inet6");
1da177e4
LT		 2843}
2844#endif /* CONFIG_PROC_FS */
2845
59fbb3a6 2846#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3b9f9a1c
NT		 2847/* Check if address is a home address configured on any interface. */
2848int ipv6_chk_home_addr(struct in6_addr *addr)
2849{
2850 int ret = 0;
2851 struct inet6_ifaddr * ifp;
2852 u8 hash = ipv6_addr_hash(addr);
2853 read_lock_bh(&addrconf_hash_lock);
2854 for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) {
2855 if (ipv6_addr_cmp(&ifp->addr, addr) == 0 &&
2856 (ifp->flags & IFA_F_HOMEADDRESS)) {
2857 ret = 1;
2858 break;
2859 }
2860 }
2861 read_unlock_bh(&addrconf_hash_lock);
2862 return ret;
2863}
2864#endif
2865
1da177e4
LT		 2866/*
2867 * Periodic address status verification
2868 */
2869
2870static void addrconf_verify(unsigned long foo)
2871{
2872 struct inet6_ifaddr *ifp;
2873 unsigned long now, next;
2874 int i;
2875
2876 spin_lock_bh(&addrconf_verify_lock);
2877 now = jiffies;
2878 next = now + ADDR_CHECK_FREQUENCY;
2879
2880 del_timer(&addr_chk_timer);
2881
2882 for (i=0; i < IN6_ADDR_HSIZE; i++) {
2883
2884restart:
5d5780df 2885 read_lock(&addrconf_hash_lock);
1da177e4
LT		 2886 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
2887 unsigned long age;
2888#ifdef CONFIG_IPV6_PRIVACY
2889 unsigned long regen_advance;
2890#endif
2891
2892 if (ifp->flags & IFA_F_PERMANENT)
2893 continue;
2894
2895 spin_lock(&ifp->lock);
2896 age = (now - ifp->tstamp) / HZ;
2897
2898#ifdef CONFIG_IPV6_PRIVACY
1ab1457c
YH		 2899 regen_advance = ifp->idev->cnf.regen_max_retry *
2900 ifp->idev->cnf.dad_transmits *
1da177e4
LT		 2901 ifp->idev->nd_parms->retrans_time / HZ;
2902#endif
2903
8f27ebb9
YH		 2904 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
2905 age >= ifp->valid_lft) {
1da177e4
LT		 2906 spin_unlock(&ifp->lock);
2907 in6_ifa_hold(ifp);
5d5780df 2908 read_unlock(&addrconf_hash_lock);
1da177e4
LT		 2909 ipv6_del_addr(ifp);
2910 goto restart;
8f27ebb9
YH		 2911 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
2912 spin_unlock(&ifp->lock);
2913 continue;
1da177e4
LT		 2914 } else if (age >= ifp->prefered_lft) {
2915 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
2916 int deprecate = 0;
2917
2918 if (!(ifp->flags&IFA_F_DEPRECATED)) {
2919 deprecate = 1;
2920 ifp->flags |= IFA_F_DEPRECATED;
2921 }
2922
2923 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
2924 next = ifp->tstamp + ifp->valid_lft * HZ;
2925
2926 spin_unlock(&ifp->lock);
2927
2928 if (deprecate) {
2929 in6_ifa_hold(ifp);
5d5780df 2930 read_unlock(&addrconf_hash_lock);
1da177e4
LT		 2931
2932 ipv6_ifa_notify(0, ifp);
2933 in6_ifa_put(ifp);
2934 goto restart;
2935 }
2936#ifdef CONFIG_IPV6_PRIVACY
2937 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
2938 !(ifp->flags&IFA_F_TENTATIVE)) {
2939 if (age >= ifp->prefered_lft - regen_advance) {
2940 struct inet6_ifaddr *ifpub = ifp->ifpub;
2941 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2942 next = ifp->tstamp + ifp->prefered_lft * HZ;
2943 if (!ifp->regen_count && ifpub) {
2944 ifp->regen_count++;
2945 in6_ifa_hold(ifp);
2946 in6_ifa_hold(ifpub);
2947 spin_unlock(&ifp->lock);
5d5780df 2948 read_unlock(&addrconf_hash_lock);
291d809b
HY		 2949 spin_lock(&ifpub->lock);
2950 ifpub->regen_count = 0;
2951 spin_unlock(&ifpub->lock);
1da177e4
LT		 2952 ipv6_create_tempaddr(ifpub, ifp);
2953 in6_ifa_put(ifpub);
2954 in6_ifa_put(ifp);
2955 goto restart;
2956 }
2957 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
2958 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
2959 spin_unlock(&ifp->lock);
2960#endif
2961 } else {
2962 /* ifp->prefered_lft <= ifp->valid_lft */
2963 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2964 next = ifp->tstamp + ifp->prefered_lft * HZ;
2965 spin_unlock(&ifp->lock);
2966 }
2967 }
5d5780df 2968 read_unlock(&addrconf_hash_lock);
1da177e4
LT		 2969 }
2970
2971 addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
2972 add_timer(&addr_chk_timer);
2973 spin_unlock_bh(&addrconf_verify_lock);
2974}
2975
461d8837
TG		 2976static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
2977{
2978 struct in6_addr *pfx = NULL;
2979
2980 if (addr)
2981 pfx = nla_data(addr);
2982
2983 if (local) {
2984 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
2985 pfx = NULL;
2986 else
2987 pfx = nla_data(local);
2988 }
2989
2990 return pfx;
2991}
2992
ef7c79ed 2993static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
461d8837
TG		 2994 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
2995 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
2996 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
2997};
2998
1da177e4
LT		 2999static int
3000inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3001{
b854272b 3002 struct net *net = skb->sk->sk_net;
b933f716
TG		 3003 struct ifaddrmsg *ifm;
3004 struct nlattr *tb[IFA_MAX+1];
1da177e4 3005 struct in6_addr *pfx;
b933f716 3006 int err;
1da177e4 3007
b854272b
DL		 3008 if (net != &init_net)
3009 return -EINVAL;
3010
b933f716
TG		 3011 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3012 if (err < 0)
3013 return err;
3014
3015 ifm = nlmsg_data(nlh);
3016 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
1da177e4
LT		 3017 if (pfx == NULL)
3018 return -EINVAL;
3019
3020 return inet6_addr_del(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3021}
3022
55ebaef1
NT		 3023static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3024 u32 prefered_lft, u32 valid_lft)
081bba5b 3025{
46d48046
YH		 3026 u32 flags = RTF_EXPIRES;
3027
081bba5b
NT		 3028 if (!valid_lft || (prefered_lft > valid_lft))
3029 return -EINVAL;
3030
46d48046 3031 if (valid_lft == INFINITY_LIFE_TIME) {
55ebaef1 3032 ifa_flags |= IFA_F_PERMANENT;
46d48046
YH		 3033 flags = 0;
3034 } else if (valid_lft >= 0x7FFFFFFF/HZ)
081bba5b
NT		 3035 valid_lft = 0x7FFFFFFF/HZ;
3036
3037 if (prefered_lft == 0)
55ebaef1 3038 ifa_flags |= IFA_F_DEPRECATED;
081bba5b
NT		 3039 else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
3040 (prefered_lft != INFINITY_LIFE_TIME))
3041 prefered_lft = 0x7FFFFFFF/HZ;
3042
3043 spin_lock_bh(&ifp->lock);
3b9f9a1c 3044 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
081bba5b
NT		 3045 ifp->tstamp = jiffies;
3046 ifp->valid_lft = valid_lft;
3047 ifp->prefered_lft = prefered_lft;
3048
3049 spin_unlock_bh(&ifp->lock);
3050 if (!(ifp->flags&IFA_F_TENTATIVE))
3051 ipv6_ifa_notify(0, ifp);
081bba5b 3052
46d48046
YH		 3053 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3054 jiffies_to_clock_t(valid_lft * HZ), flags);
081bba5b
NT		 3055 addrconf_verify(0);
3056
3057 return 0;
3058}
3059
1da177e4
LT		 3060static int
3061inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3062{
b854272b 3063 struct net *net = skb->sk->sk_net;
461d8837
TG		 3064 struct ifaddrmsg *ifm;
3065 struct nlattr *tb[IFA_MAX+1];
1da177e4 3066 struct in6_addr *pfx;
7198f8ce
TG		 3067 struct inet6_ifaddr *ifa;
3068 struct net_device *dev;
55ebaef1
NT		 3069 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3070 u8 ifa_flags;
461d8837 3071 int err;
1da177e4 3072
b854272b
DL		 3073 if (net != &init_net)
3074 return -EINVAL;
3075
461d8837
TG		 3076 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3077 if (err < 0)
3078 return err;
3079
3080 ifm = nlmsg_data(nlh);
3081 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
1da177e4
LT		 3082 if (pfx == NULL)
3083 return -EINVAL;
3084
461d8837 3085 if (tb[IFA_CACHEINFO]) {
0778769d 3086 struct ifa_cacheinfo *ci;
461d8837
TG		 3087
3088 ci = nla_data(tb[IFA_CACHEINFO]);
0778769d 3089 valid_lft = ci->ifa_valid;
461d8837
TG		 3090 preferred_lft = ci->ifa_prefered;
3091 } else {
3092 preferred_lft = INFINITY_LIFE_TIME;
3093 valid_lft = INFINITY_LIFE_TIME;
0778769d
NT		 3094 }
3095
881d966b 3096 dev = __dev_get_by_index(&init_net, ifm->ifa_index);
7198f8ce
TG		 3097 if (dev == NULL)
3098 return -ENODEV;
3099
55ebaef1 3100 /* We ignore other flags so far. */
3b9f9a1c 3101 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
55ebaef1 3102
7198f8ce
TG		 3103 ifa = ipv6_get_ifaddr(pfx, dev, 1);
3104 if (ifa == NULL) {
3105 /*
3106 * It would be best to check for !NLM_F_CREATE here but
3107 * userspace alreay relies on not having to provide this.
3108 */
3109 return inet6_addr_add(ifm->ifa_index, pfx, ifm->ifa_prefixlen,
55ebaef1 3110 ifa_flags, preferred_lft, valid_lft);
081bba5b
NT		 3111 }
3112
7198f8ce
TG		 3113 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3114 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3115 err = -EEXIST;
3116 else
55ebaef1 3117 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
7198f8ce
TG		 3118
3119 in6_ifa_put(ifa);
3120
3121 return err;
1da177e4
LT		 3122}
3123
101bb229
TG		 3124static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3125 u8 scope, int ifindex)
3126{
3127 struct ifaddrmsg *ifm;
3128
3129 ifm = nlmsg_data(nlh);
3130 ifm->ifa_family = AF_INET6;
3131 ifm->ifa_prefixlen = prefixlen;
3132 ifm->ifa_flags = flags;
3133 ifm->ifa_scope = scope;
3134 ifm->ifa_index = ifindex;
3135}
3136
85486af0
TG		 3137static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3138 unsigned long tstamp, u32 preferred, u32 valid)
3139{
3140 struct ifa_cacheinfo ci;
3141
3142 ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3143 + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3144 ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3145 + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3146 ci.ifa_prefered = preferred;
3147 ci.ifa_valid = valid;
3148
3149 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3150}
3151
101bb229
TG		 3152static inline int rt_scope(int ifa_scope)
3153{
3154 if (ifa_scope & IFA_HOST)
3155 return RT_SCOPE_HOST;
3156 else if (ifa_scope & IFA_LINK)
3157 return RT_SCOPE_LINK;
3158 else if (ifa_scope & IFA_SITE)
3159 return RT_SCOPE_SITE;
3160 else
3161 return RT_SCOPE_UNIVERSE;
3162}
3163
0ab6803b
TG		 3164static inline int inet6_ifaddr_msgsize(void)
3165{
339bf98f
TG		 3166 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3167 + nla_total_size(16) /* IFA_ADDRESS */
3168 + nla_total_size(sizeof(struct ifa_cacheinfo));
0ab6803b 3169}
c5396a31 3170
1da177e4 3171static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
b6544c0b 3172 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3173{
1da177e4 3174 struct nlmsghdr *nlh;
85486af0 3175 u32 preferred, valid;
1da177e4 3176
0ab6803b
TG		 3177 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3178 if (nlh == NULL)
26932566 3179 return -EMSGSIZE;
0ab6803b 3180
101bb229
TG		 3181 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3182 ifa->idev->dev->ifindex);
3183
1da177e4 3184 if (!(ifa->flags&IFA_F_PERMANENT)) {
85486af0
TG		 3185 preferred = ifa->prefered_lft;
3186 valid = ifa->valid_lft;
3187 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 3188 long tval = (jiffies - ifa->tstamp)/HZ;
85486af0
TG		 3189 preferred -= tval;
3190 if (valid != INFINITY_LIFE_TIME)
3191 valid -= tval;
1da177e4
LT		 3192 }
3193 } else {
85486af0
TG		 3194 preferred = INFINITY_LIFE_TIME;
3195 valid = INFINITY_LIFE_TIME;
3196 }
3197
0ab6803b 3198 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
26932566
PM		 3199 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3200 nlmsg_cancel(skb, nlh);
3201 return -EMSGSIZE;
3202 }
1da177e4 3203
0ab6803b 3204 return nlmsg_end(skb, nlh);
1da177e4
LT		 3205}
3206
3207static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
e431b8c0 3208 u32 pid, u32 seq, int event, u16 flags)
1da177e4 3209{
1da177e4 3210 struct nlmsghdr *nlh;
101bb229
TG		 3211 u8 scope = RT_SCOPE_UNIVERSE;
3212 int ifindex = ifmca->idev->dev->ifindex;
3213
3214 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3215 scope = RT_SCOPE_SITE;
1da177e4 3216
0ab6803b
TG		 3217 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3218 if (nlh == NULL)
26932566 3219 return -EMSGSIZE;
85486af0 3220
0ab6803b
TG		 3221 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3222 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3223 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 3224 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3225 nlmsg_cancel(skb, nlh);
3226 return -EMSGSIZE;
3227 }
85486af0 3228
0ab6803b 3229 return nlmsg_end(skb, nlh);
1da177e4
LT		 3230}
3231
3232static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
b6544c0b 3233 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3234{
1da177e4 3235 struct nlmsghdr *nlh;
101bb229
TG		 3236 u8 scope = RT_SCOPE_UNIVERSE;
3237 int ifindex = ifaca->aca_idev->dev->ifindex;
3238
3239 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3240 scope = RT_SCOPE_SITE;
1da177e4 3241
0ab6803b
TG		 3242 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3243 if (nlh == NULL)
26932566 3244 return -EMSGSIZE;
85486af0 3245
0ab6803b
TG		 3246 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3247 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3248 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 3249 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3250 nlmsg_cancel(skb, nlh);
3251 return -EMSGSIZE;
3252 }
1da177e4 3253
0ab6803b 3254 return nlmsg_end(skb, nlh);
1da177e4
LT		 3255}
3256
3257enum addr_type_t
3258{
3259 UNICAST_ADDR,
3260 MULTICAST_ADDR,
3261 ANYCAST_ADDR,
3262};
3263
3264static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3265 enum addr_type_t type)
3266{
3267 int idx, ip_idx;
3268 int s_idx, s_ip_idx;
3269 int err = 1;
3270 struct net_device *dev;
3271 struct inet6_dev *idev = NULL;
3272 struct inet6_ifaddr *ifa;
3273 struct ifmcaddr6 *ifmca;
3274 struct ifacaddr6 *ifaca;
3275
3276 s_idx = cb->args[0];
3277 s_ip_idx = ip_idx = cb->args[1];
1ab1457c 3278
7562f876 3279 idx = 0;
881d966b 3280 for_each_netdev(&init_net, dev) {
1da177e4 3281 if (idx < s_idx)
7562f876 3282 goto cont;
1da177e4
LT		 3283 if (idx > s_idx)
3284 s_ip_idx = 0;
3285 ip_idx = 0;
3286 if ((idev = in6_dev_get(dev)) == NULL)
7562f876 3287 goto cont;
1da177e4
LT		 3288 read_lock_bh(&idev->lock);
3289 switch (type) {
3290 case UNICAST_ADDR:
ae9cda5d 3291 /* unicast address incl. temp addr */
1da177e4
LT		 3292 for (ifa = idev->addr_list; ifa;
3293 ifa = ifa->if_next, ip_idx++) {
3294 if (ip_idx < s_ip_idx)
3295 continue;
1ab1457c
YH		 3296 if ((err = inet6_fill_ifaddr(skb, ifa,
3297 NETLINK_CB(cb->skb).pid,
b6544c0b
JHS		 3298 cb->nlh->nlmsg_seq, RTM_NEWADDR,
3299 NLM_F_MULTI)) <= 0)
1da177e4
LT		 3300 goto done;
3301 }
1da177e4
LT		 3302 break;
3303 case MULTICAST_ADDR:
3304 /* multicast address */
1ab1457c 3305 for (ifmca = idev->mc_list; ifmca;
1da177e4
LT		 3306 ifmca = ifmca->next, ip_idx++) {
3307 if (ip_idx < s_ip_idx)
3308 continue;
1ab1457c
YH		 3309 if ((err = inet6_fill_ifmcaddr(skb, ifmca,
3310 NETLINK_CB(cb->skb).pid,
b6544c0b
JHS		 3311 cb->nlh->nlmsg_seq, RTM_GETMULTICAST,
3312 NLM_F_MULTI)) <= 0)
1da177e4
LT		 3313 goto done;
3314 }
3315 break;
3316 case ANYCAST_ADDR:
3317 /* anycast address */
3318 for (ifaca = idev->ac_list; ifaca;
3319 ifaca = ifaca->aca_next, ip_idx++) {
3320 if (ip_idx < s_ip_idx)
3321 continue;
1ab1457c
YH		 3322 if ((err = inet6_fill_ifacaddr(skb, ifaca,
3323 NETLINK_CB(cb->skb).pid,
b6544c0b 3324 cb->nlh->nlmsg_seq, RTM_GETANYCAST,
1ab1457c 3325 NLM_F_MULTI)) <= 0)
1da177e4
LT		 3326 goto done;
3327 }
3328 break;
3329 default:
3330 break;
3331 }
3332 read_unlock_bh(&idev->lock);
3333 in6_dev_put(idev);
7562f876
PE		 3334cont:
3335 idx++;
1da177e4
LT		 3336 }
3337done:
3338 if (err <= 0) {
3339 read_unlock_bh(&idev->lock);
3340 in6_dev_put(idev);
3341 }
1da177e4
LT		 3342 cb->args[0] = idx;
3343 cb->args[1] = ip_idx;
3344 return skb->len;
3345}
3346
3347static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3348{
b854272b 3349 struct net *net = skb->sk->sk_net;
1da177e4 3350 enum addr_type_t type = UNICAST_ADDR;
b854272b
DL		 3351
3352 if (net != &init_net)
3353 return 0;
3354
1da177e4
LT		 3355 return inet6_dump_addr(skb, cb, type);
3356}
3357
3358static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3359{
b854272b 3360 struct net *net = skb->sk->sk_net;
1da177e4 3361 enum addr_type_t type = MULTICAST_ADDR;
b854272b
DL		 3362
3363 if (net != &init_net)
3364 return 0;
3365
1da177e4
LT		 3366 return inet6_dump_addr(skb, cb, type);
3367}
3368
3369
3370static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3371{
b854272b 3372 struct net *net = skb->sk->sk_net;
1da177e4 3373 enum addr_type_t type = ANYCAST_ADDR;
b854272b
DL		 3374
3375 if (net != &init_net)
3376 return 0;
3377
1da177e4
LT		 3378 return inet6_dump_addr(skb, cb, type);
3379}
3380
1b29fc2c
TG		 3381static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3382 void *arg)
6c223828 3383{
b854272b 3384 struct net *net = in_skb->sk->sk_net;
1b29fc2c
TG		 3385 struct ifaddrmsg *ifm;
3386 struct nlattr *tb[IFA_MAX+1];
6c223828
NT		 3387 struct in6_addr *addr = NULL;
3388 struct net_device *dev = NULL;
3389 struct inet6_ifaddr *ifa;
3390 struct sk_buff *skb;
6c223828
NT		 3391 int err;
3392
b854272b
DL		 3393 if (net != &init_net)
3394 return -EINVAL;
3395
1b29fc2c
TG		 3396 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3397 if (err < 0)
3398 goto errout;
3399
3400 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3401 if (addr == NULL) {
3402 err = -EINVAL;
3403 goto errout;
6c223828 3404 }
6c223828 3405
1b29fc2c 3406 ifm = nlmsg_data(nlh);
6c223828 3407 if (ifm->ifa_index)
881d966b 3408 dev = __dev_get_by_index(&init_net, ifm->ifa_index);
6c223828 3409
1b29fc2c
TG		 3410 if ((ifa = ipv6_get_ifaddr(addr, dev, 1)) == NULL) {
3411 err = -EADDRNOTAVAIL;
3412 goto errout;
3413 }
6c223828 3414
0ab6803b 3415 if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) {
6c223828 3416 err = -ENOBUFS;
1b29fc2c 3417 goto errout_ifa;
6c223828
NT		 3418 }
3419
6c223828
NT		 3420 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3421 nlh->nlmsg_seq, RTM_NEWADDR, 0);
26932566
PM		 3422 if (err < 0) {
3423 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3424 WARN_ON(err == -EMSGSIZE);
3425 kfree_skb(skb);
3426 goto errout_ifa;
3427 }
97c53cac 3428 err = rtnl_unicast(skb, &init_net, NETLINK_CB(in_skb).pid);
1b29fc2c 3429errout_ifa:
6c223828 3430 in6_ifa_put(ifa);
1b29fc2c 3431errout:
6c223828 3432 return err;
6c223828
NT		 3433}
3434
1da177e4
LT		 3435static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3436{
3437 struct sk_buff *skb;
5d620266 3438 int err = -ENOBUFS;
1da177e4 3439
0ab6803b 3440 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5d620266
TG		 3441 if (skb == NULL)
3442 goto errout;
3443
3444 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
26932566
PM		 3445 if (err < 0) {
3446 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3447 WARN_ON(err == -EMSGSIZE);
3448 kfree_skb(skb);
3449 goto errout;
3450 }
97c53cac 3451 err = rtnl_notify(skb, &init_net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
5d620266
TG		 3452errout:
3453 if (err < 0)
97c53cac 3454 rtnl_set_sk_err(&init_net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 3455}
3456
b6f99a21 3457static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
1da177e4
LT		 3458 __s32 *array, int bytes)
3459{
04561c1f
TG		 3460 BUG_ON(bytes < (DEVCONF_MAX * 4));
3461
1da177e4
LT		 3462 memset(array, 0, bytes);
3463 array[DEVCONF_FORWARDING] = cnf->forwarding;
3464 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3465 array[DEVCONF_MTU6] = cnf->mtu6;
3466 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3467 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3468 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3469 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3470 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3471 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3472 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3473 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3474#ifdef CONFIG_IPV6_PRIVACY
3475 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3476 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3477 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3478 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3479 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3480#endif
3481 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 3482 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
c4fd30eb 3483 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 3484#ifdef CONFIG_IPV6_ROUTER_PREF
3485 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
52e16356 3486 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
fa03ef38 3487#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 3488 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3489#endif
930d6ff2 3490#endif
fbea49e1 3491 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
0bcbc926 3492 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
95c385b4
NH		 3493#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3494 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3495#endif
1da177e4
LT		 3496}
3497
339bf98f
TG		 3498static inline size_t inet6_if_nlmsg_size(void)
3499{
3500 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3501 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3502 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3503 + nla_total_size(4) /* IFLA_MTU */
3504 + nla_total_size(4) /* IFLA_LINK */
3505 + nla_total_size( /* IFLA_PROTINFO */
3506 nla_total_size(4) /* IFLA_INET6_FLAGS */
3507 + nla_total_size(sizeof(struct ifla_cacheinfo))
3508 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
bf99f1bd
YH		 3509 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3510 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
339bf98f
TG		 3511 );
3512}
c5396a31 3513
7f7d9a6b
HX		 3514static inline void __snmp6_fill_stats(u64 *stats, void **mib, int items,
3515 int bytes)
3516{
3517 int i;
3518 int pad = bytes - sizeof(u64) * items;
3519 BUG_ON(pad < 0);
3520
3521 /* Use put_unaligned() because stats may not be aligned for u64. */
3522 put_unaligned(items, &stats[0]);
3523 for (i = 1; i < items; i++)
3524 put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3525
3526 memset(&stats[items], 0, pad);
3527}
3528
3529static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3530 int bytes)
3531{
3532 switch(attrtype) {
3533 case IFLA_INET6_STATS:
3534 __snmp6_fill_stats(stats, (void **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes);
3535 break;
3536 case IFLA_INET6_ICMP6STATS:
3537 __snmp6_fill_stats(stats, (void **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
3538 break;
3539 }
3540}
3541
1ab1457c 3542static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
b6544c0b 3543 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3544{
04561c1f 3545 struct net_device *dev = idev->dev;
bf99f1bd 3546 struct nlattr *nla;
04561c1f
TG		 3547 struct ifinfomsg *hdr;
3548 struct nlmsghdr *nlh;
3549 void *protoinfo;
3550 struct ifla_cacheinfo ci;
3551
3552 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3553 if (nlh == NULL)
26932566 3554 return -EMSGSIZE;
04561c1f
TG		 3555
3556 hdr = nlmsg_data(nlh);
3557 hdr->ifi_family = AF_INET6;
3558 hdr->__ifi_pad = 0;
3559 hdr->ifi_type = dev->type;
3560 hdr->ifi_index = dev->ifindex;
3561 hdr->ifi_flags = dev_get_flags(dev);
3562 hdr->ifi_change = 0;
3563
3564 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
1da177e4
LT		 3565
3566 if (dev->addr_len)
04561c1f 3567 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
1da177e4 3568
04561c1f 3569 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
1da177e4 3570 if (dev->ifindex != dev->iflink)
04561c1f 3571 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
1da177e4 3572
04561c1f
TG		 3573 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3574 if (protoinfo == NULL)
3575 goto nla_put_failure;
1da177e4 3576
04561c1f 3577 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
1da177e4 3578
1da177e4
LT		 3579 ci.max_reasm_len = IPV6_MAXPLEN;
3580 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3581 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3582 ci.reachable_time = idev->nd_parms->reachable_time;
3583 ci.retrans_time = idev->nd_parms->retrans_time;
04561c1f
TG		 3584 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3585
bf99f1bd
YH		 3586 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3587 if (nla == NULL)
04561c1f 3588 goto nla_put_failure;
bf99f1bd 3589 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
1da177e4 3590
bf99f1bd
YH		 3591 /* XXX - MC not implemented */
3592
3593 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3594 if (nla == NULL)
3595 goto nla_put_failure;
3596 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3597
3598 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3599 if (nla == NULL)
3600 goto nla_put_failure;
3601 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
1da177e4 3602
04561c1f
TG		 3603 nla_nest_end(skb, protoinfo);
3604 return nlmsg_end(skb, nlh);
1da177e4 3605
04561c1f 3606nla_put_failure:
26932566
PM		 3607 nlmsg_cancel(skb, nlh);
3608 return -EMSGSIZE;
1da177e4
LT		 3609}
3610
3611static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3612{
b854272b 3613 struct net *net = skb->sk->sk_net;
1da177e4
LT		 3614 int idx, err;
3615 int s_idx = cb->args[0];
3616 struct net_device *dev;
3617 struct inet6_dev *idev;
3618
b854272b
DL		 3619 if (net != &init_net)
3620 return 0;
3621
1da177e4 3622 read_lock(&dev_base_lock);
7562f876 3623 idx = 0;
881d966b 3624 for_each_netdev(&init_net, dev) {
1da177e4 3625 if (idx < s_idx)
7562f876 3626 goto cont;
1da177e4 3627 if ((idev = in6_dev_get(dev)) == NULL)
7562f876 3628 goto cont;
1ab1457c 3629 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
b6544c0b 3630 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
1da177e4
LT		 3631 in6_dev_put(idev);
3632 if (err <= 0)
3633 break;
7562f876
PE		 3634cont:
3635 idx++;
1da177e4
LT		 3636 }
3637 read_unlock(&dev_base_lock);
3638 cb->args[0] = idx;
3639
3640 return skb->len;
3641}
3642
3643void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3644{
3645 struct sk_buff *skb;
8d7a76c9 3646 int err = -ENOBUFS;
1ab1457c 3647
339bf98f 3648 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
8d7a76c9
TG		 3649 if (skb == NULL)
3650 goto errout;
3651
3652 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 3653 if (err < 0) {
3654 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3655 WARN_ON(err == -EMSGSIZE);
3656 kfree_skb(skb);
3657 goto errout;
3658 }
97c53cac 3659 err = rtnl_notify(skb, &init_net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
8d7a76c9
TG		 3660errout:
3661 if (err < 0)
97c53cac 3662 rtnl_set_sk_err(&init_net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 3663}
3664
339bf98f
TG		 3665static inline size_t inet6_prefix_nlmsg_size(void)
3666{
3667 return NLMSG_ALIGN(sizeof(struct prefixmsg))
3668 + nla_total_size(sizeof(struct in6_addr))
3669 + nla_total_size(sizeof(struct prefix_cacheinfo));
3670}
c5396a31 3671
1da177e4 3672static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
6051e2f4
TG		 3673 struct prefix_info *pinfo, u32 pid, u32 seq,
3674 int event, unsigned int flags)
1da177e4 3675{
6051e2f4
TG		 3676 struct prefixmsg *pmsg;
3677 struct nlmsghdr *nlh;
1da177e4
LT		 3678 struct prefix_cacheinfo ci;
3679
6051e2f4
TG		 3680 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
3681 if (nlh == NULL)
26932566 3682 return -EMSGSIZE;
6051e2f4
TG		 3683
3684 pmsg = nlmsg_data(nlh);
1da177e4 3685 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 3686 pmsg->prefix_pad1 = 0;
3687 pmsg->prefix_pad2 = 0;
1da177e4
LT		 3688 pmsg->prefix_ifindex = idev->dev->ifindex;
3689 pmsg->prefix_len = pinfo->prefix_len;
3690 pmsg->prefix_type = pinfo->type;
8a47077a 3691 pmsg->prefix_pad3 = 0;
1da177e4
LT		 3692 pmsg->prefix_flags = 0;
3693 if (pinfo->onlink)
3694 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3695 if (pinfo->autoconf)
3696 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3697
6051e2f4 3698 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
1da177e4
LT		 3699
3700 ci.preferred_time = ntohl(pinfo->prefered);
3701 ci.valid_time = ntohl(pinfo->valid);
6051e2f4 3702 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
1da177e4 3703
6051e2f4 3704 return nlmsg_end(skb, nlh);
1da177e4 3705
6051e2f4 3706nla_put_failure:
26932566
PM		 3707 nlmsg_cancel(skb, nlh);
3708 return -EMSGSIZE;
1da177e4
LT		 3709}
3710
1ab1457c 3711static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 3712 struct prefix_info *pinfo)
3713{
3714 struct sk_buff *skb;
8c384bfa 3715 int err = -ENOBUFS;
1da177e4 3716
339bf98f 3717 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
8c384bfa
TG		 3718 if (skb == NULL)
3719 goto errout;
3720
3721 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 3722 if (err < 0) {
3723 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
3724 WARN_ON(err == -EMSGSIZE);
3725 kfree_skb(skb);
3726 goto errout;
3727 }
97c53cac 3728 err = rtnl_notify(skb, &init_net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
8c384bfa
TG		 3729errout:
3730 if (err < 0)
97c53cac 3731 rtnl_set_sk_err(&init_net, RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 3732}
3733
1da177e4
LT		 3734static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3735{
3736 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3737
3738 switch (event) {
3739 case RTM_NEWADDR:
95c385b4
NH		 3740 /*
3741 * If the address was optimistic
3742 * we inserted the route at the start of
3743 * our DAD process, so we don't need
3744 * to do it again
3745 */
3746 if (!(ifp->rt->rt6i_node))
3747 ip6_ins_rt(ifp->rt);
1da177e4
LT		 3748 if (ifp->idev->cnf.forwarding)
3749 addrconf_join_anycast(ifp);
3750 break;
3751 case RTM_DELADDR:
3752 if (ifp->idev->cnf.forwarding)
3753 addrconf_leave_anycast(ifp);
3754 addrconf_leave_solict(ifp->idev, &ifp->addr);
3755 dst_hold(&ifp->rt->u.dst);
e0a1ad73 3756 if (ip6_del_rt(ifp->rt))
1da177e4 3757 dst_free(&ifp->rt->u.dst);
1da177e4
LT		 3758 break;
3759 }
3760}
3761
3762static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3763{
8814c4b5 3764 rcu_read_lock_bh();
1da177e4
LT		 3765 if (likely(ifp->idev->dead == 0))
3766 __ipv6_ifa_notify(event, ifp);
8814c4b5 3767 rcu_read_unlock_bh();
1da177e4
LT		 3768}
3769
3770#ifdef CONFIG_SYSCTL
3771
3772static
3773int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3774 void __user *buffer, size_t *lenp, loff_t *ppos)
3775{
3776 int *valp = ctl->data;
3777 int val = *valp;
3778 int ret;
3779
3780 ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3781
c8fecf22
PE		 3782 if (write)
3783 addrconf_fixup_forwarding(ctl, valp, val);
1ab1457c 3784 return ret;
1da177e4
LT		 3785}
3786
1ab1457c 3787static int addrconf_sysctl_forward_strategy(ctl_table *table,
1da177e4
LT		 3788 int __user *name, int nlen,
3789 void __user *oldval,
3790 size_t __user *oldlenp,
1f29bcd7 3791 void __user *newval, size_t newlen)
1da177e4
LT		 3792{
3793 int *valp = table->data;
c8fecf22 3794 int val = *valp;
1da177e4
LT		 3795 int new;
3796
3797 if (!newval || !newlen)
3798 return 0;
3799 if (newlen != sizeof(int))
3800 return -EINVAL;
3801 if (get_user(new, (int __user *)newval))
3802 return -EFAULT;
3803 if (new == *valp)
3804 return 0;
3805 if (oldval && oldlenp) {
3806 size_t len;
3807 if (get_user(len, oldlenp))
3808 return -EFAULT;
3809 if (len) {
3810 if (len > table->maxlen)
3811 len = table->maxlen;
3812 if (copy_to_user(oldval, valp, len))
3813 return -EFAULT;
3814 if (put_user(len, oldlenp))
3815 return -EFAULT;
3816 }
3817 }
3818
c8fecf22
PE		 3819 *valp = new;
3820 addrconf_fixup_forwarding(table, valp, val);
1da177e4
LT		 3821 return 1;
3822}
3823
3824static struct addrconf_sysctl_table
3825{
3826 struct ctl_table_header *sysctl_header;
3827 ctl_table addrconf_vars[__NET_IPV6_MAX];
1dab6222 3828 char *dev_name;
ab32ea5d 3829} addrconf_sysctl __read_mostly = {
1da177e4
LT		 3830 .sysctl_header = NULL,
3831 .addrconf_vars = {
1ab1457c 3832 {
1da177e4
LT		 3833 .ctl_name = NET_IPV6_FORWARDING,
3834 .procname = "forwarding",
1ab1457c 3835 .data = &ipv6_devconf.forwarding,
1da177e4
LT		 3836 .maxlen = sizeof(int),
3837 .mode = 0644,
1ab1457c 3838 .proc_handler = &addrconf_sysctl_forward,
1da177e4
LT		 3839 .strategy = &addrconf_sysctl_forward_strategy,
3840 },
3841 {
3842 .ctl_name = NET_IPV6_HOP_LIMIT,
3843 .procname = "hop_limit",
1ab1457c 3844 .data = &ipv6_devconf.hop_limit,
1da177e4
LT		 3845 .maxlen = sizeof(int),
3846 .mode = 0644,
3847 .proc_handler = proc_dointvec,
3848 },
3849 {
3850 .ctl_name = NET_IPV6_MTU,
3851 .procname = "mtu",
3852 .data = &ipv6_devconf.mtu6,
1ab1457c 3853 .maxlen = sizeof(int),
1da177e4 3854 .mode = 0644,
1ab1457c 3855 .proc_handler = &proc_dointvec,
1da177e4
LT		 3856 },
3857 {
3858 .ctl_name = NET_IPV6_ACCEPT_RA,
3859 .procname = "accept_ra",
1ab1457c 3860 .data = &ipv6_devconf.accept_ra,
1da177e4
LT		 3861 .maxlen = sizeof(int),
3862 .mode = 0644,
1ab1457c 3863 .proc_handler = &proc_dointvec,
1da177e4
LT		 3864 },
3865 {
3866 .ctl_name = NET_IPV6_ACCEPT_REDIRECTS,
3867 .procname = "accept_redirects",
1ab1457c 3868 .data = &ipv6_devconf.accept_redirects,
1da177e4
LT		 3869 .maxlen = sizeof(int),
3870 .mode = 0644,
1ab1457c 3871 .proc_handler = &proc_dointvec,
1da177e4
LT		 3872 },
3873 {
3874 .ctl_name = NET_IPV6_AUTOCONF,
3875 .procname = "autoconf",
1ab1457c 3876 .data = &ipv6_devconf.autoconf,
1da177e4
LT		 3877 .maxlen = sizeof(int),
3878 .mode = 0644,
1ab1457c 3879 .proc_handler = &proc_dointvec,
1da177e4
LT		 3880 },
3881 {
3882 .ctl_name = NET_IPV6_DAD_TRANSMITS,
3883 .procname = "dad_transmits",
1ab1457c 3884 .data = &ipv6_devconf.dad_transmits,
1da177e4
LT		 3885 .maxlen = sizeof(int),
3886 .mode = 0644,
1ab1457c 3887 .proc_handler = &proc_dointvec,
1da177e4
LT		 3888 },
3889 {
3890 .ctl_name = NET_IPV6_RTR_SOLICITS,
3891 .procname = "router_solicitations",
1ab1457c 3892 .data = &ipv6_devconf.rtr_solicits,
1da177e4
LT		 3893 .maxlen = sizeof(int),
3894 .mode = 0644,
1ab1457c 3895 .proc_handler = &proc_dointvec,
1da177e4
LT		 3896 },
3897 {
3898 .ctl_name = NET_IPV6_RTR_SOLICIT_INTERVAL,
3899 .procname = "router_solicitation_interval",
1ab1457c 3900 .data = &ipv6_devconf.rtr_solicit_interval,
1da177e4
LT		 3901 .maxlen = sizeof(int),
3902 .mode = 0644,
1ab1457c 3903 .proc_handler = &proc_dointvec_jiffies,
1da177e4
LT		 3904 .strategy = &sysctl_jiffies,
3905 },
3906 {
3907 .ctl_name = NET_IPV6_RTR_SOLICIT_DELAY,
3908 .procname = "router_solicitation_delay",
1ab1457c 3909 .data = &ipv6_devconf.rtr_solicit_delay,
1da177e4
LT		 3910 .maxlen = sizeof(int),
3911 .mode = 0644,
1ab1457c 3912 .proc_handler = &proc_dointvec_jiffies,
1da177e4
LT		 3913 .strategy = &sysctl_jiffies,
3914 },
3915 {
3916 .ctl_name = NET_IPV6_FORCE_MLD_VERSION,
3917 .procname = "force_mld_version",
1ab1457c 3918 .data = &ipv6_devconf.force_mld_version,
1da177e4
LT		 3919 .maxlen = sizeof(int),
3920 .mode = 0644,
1ab1457c 3921 .proc_handler = &proc_dointvec,
1da177e4
LT		 3922 },
3923#ifdef CONFIG_IPV6_PRIVACY
3924 {
3925 .ctl_name = NET_IPV6_USE_TEMPADDR,
3926 .procname = "use_tempaddr",
1ab1457c 3927 .data = &ipv6_devconf.use_tempaddr,
1da177e4
LT		 3928 .maxlen = sizeof(int),
3929 .mode = 0644,
1ab1457c 3930 .proc_handler = &proc_dointvec,
1da177e4
LT		 3931 },
3932 {
3933 .ctl_name = NET_IPV6_TEMP_VALID_LFT,
3934 .procname = "temp_valid_lft",
1ab1457c 3935 .data = &ipv6_devconf.temp_valid_lft,
1da177e4
LT		 3936 .maxlen = sizeof(int),
3937 .mode = 0644,
1ab1457c 3938 .proc_handler = &proc_dointvec,
1da177e4
LT		 3939 },
3940 {
3941 .ctl_name = NET_IPV6_TEMP_PREFERED_LFT,
3942 .procname = "temp_prefered_lft",
1ab1457c 3943 .data = &ipv6_devconf.temp_prefered_lft,
1da177e4
LT		 3944 .maxlen = sizeof(int),
3945 .mode = 0644,
1ab1457c 3946 .proc_handler = &proc_dointvec,
1da177e4
LT		 3947 },
3948 {
3949 .ctl_name = NET_IPV6_REGEN_MAX_RETRY,
3950 .procname = "regen_max_retry",
1ab1457c 3951 .data = &ipv6_devconf.regen_max_retry,
1da177e4
LT		 3952 .maxlen = sizeof(int),
3953 .mode = 0644,
1ab1457c 3954 .proc_handler = &proc_dointvec,
1da177e4
LT		 3955 },
3956 {
3957 .ctl_name = NET_IPV6_MAX_DESYNC_FACTOR,
3958 .procname = "max_desync_factor",
1ab1457c 3959 .data = &ipv6_devconf.max_desync_factor,
1da177e4
LT		 3960 .maxlen = sizeof(int),
3961 .mode = 0644,
1ab1457c 3962 .proc_handler = &proc_dointvec,
1da177e4
LT		 3963 },
3964#endif
3965 {
3966 .ctl_name = NET_IPV6_MAX_ADDRESSES,
3967 .procname = "max_addresses",
3968 .data = &ipv6_devconf.max_addresses,
3969 .maxlen = sizeof(int),
3970 .mode = 0644,
3971 .proc_handler = &proc_dointvec,
3972 },
65f5c7c1
YH		 3973 {
3974 .ctl_name = NET_IPV6_ACCEPT_RA_DEFRTR,
3975 .procname = "accept_ra_defrtr",
1ab1457c 3976 .data = &ipv6_devconf.accept_ra_defrtr,
65f5c7c1
YH		 3977 .maxlen = sizeof(int),
3978 .mode = 0644,
1ab1457c 3979 .proc_handler = &proc_dointvec,
65f5c7c1 3980 },
c4fd30eb
YH		 3981 {
3982 .ctl_name = NET_IPV6_ACCEPT_RA_PINFO,
3983 .procname = "accept_ra_pinfo",
1ab1457c 3984 .data = &ipv6_devconf.accept_ra_pinfo,
c4fd30eb
YH		 3985 .maxlen = sizeof(int),
3986 .mode = 0644,
1ab1457c 3987 .proc_handler = &proc_dointvec,
c4fd30eb 3988 },
930d6ff2
YH		 3989#ifdef CONFIG_IPV6_ROUTER_PREF
3990 {
3991 .ctl_name = NET_IPV6_ACCEPT_RA_RTR_PREF,
3992 .procname = "accept_ra_rtr_pref",
3993 .data = &ipv6_devconf.accept_ra_rtr_pref,
3994 .maxlen = sizeof(int),
3995 .mode = 0644,
3996 .proc_handler = &proc_dointvec,
3997 },
52e16356
YH		 3998 {
3999 .ctl_name = NET_IPV6_RTR_PROBE_INTERVAL,
4000 .procname = "router_probe_interval",
4001 .data = &ipv6_devconf.rtr_probe_interval,
4002 .maxlen = sizeof(int),
4003 .mode = 0644,
4004 .proc_handler = &proc_dointvec_jiffies,
4005 .strategy = &sysctl_jiffies,
4006 },
fa03ef38 4007#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 4008 {
4009 .ctl_name = NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN,
4010 .procname = "accept_ra_rt_info_max_plen",
4011 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4012 .maxlen = sizeof(int),
4013 .mode = 0644,
4014 .proc_handler = &proc_dointvec,
4015 },
4016#endif
930d6ff2 4017#endif
fbea49e1
YH		 4018 {
4019 .ctl_name = NET_IPV6_PROXY_NDP,
4020 .procname = "proxy_ndp",
4021 .data = &ipv6_devconf.proxy_ndp,
4022 .maxlen = sizeof(int),
4023 .mode = 0644,
4024 .proc_handler = &proc_dointvec,
4025 },
0bcbc926
YH		 4026 {
4027 .ctl_name = NET_IPV6_ACCEPT_SOURCE_ROUTE,
4028 .procname = "accept_source_route",
4029 .data = &ipv6_devconf.accept_source_route,
4030 .maxlen = sizeof(int),
4031 .mode = 0644,
4032 .proc_handler = &proc_dointvec,
4033 },
95c385b4
NH		 4034#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4035 {
4036 .ctl_name = CTL_UNNUMBERED,
4037 .procname = "optimistic_dad",
4038 .data = &ipv6_devconf.optimistic_dad,
4039 .maxlen = sizeof(int),
4040 .mode = 0644,
4041 .proc_handler = &proc_dointvec,
4042
4043 },
4044#endif
1da177e4
LT		 4045 {
4046 .ctl_name = 0, /* sentinel */
4047 }
4048 },
1da177e4
LT		 4049};
4050
bff16c2f
PE		 4051static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4052 int ctl_name, struct inet6_dev *idev, struct ipv6_devconf *p)
1da177e4
LT		 4053{
4054 int i;
1da177e4 4055 struct addrconf_sysctl_table *t;
1da177e4 4056
1dab6222
PE		 4057#define ADDRCONF_CTL_PATH_DEV 3
4058
4059 struct ctl_path addrconf_ctl_path[] = {
4060 { .procname = "net", .ctl_name = CTL_NET, },
4061 { .procname = "ipv6", .ctl_name = NET_IPV6, },
4062 { .procname = "conf", .ctl_name = NET_IPV6_CONF, },
4063 { /* to be set */ },
4064 { },
4065 };
4066
4067
af879cc7 4068 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
1da177e4 4069 if (t == NULL)
f68635e6
PE		 4070 goto out;
4071
1da177e4
LT		 4072 for (i=0; t->addrconf_vars[i].data; i++) {
4073 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
1da177e4 4074 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
bff16c2f 4075 t->addrconf_vars[i].extra2 = net;
1da177e4 4076 }
1da177e4 4077
1ab1457c
YH		 4078 /*
4079 * Make a copy of dev_name, because '.procname' is regarded as const
1da177e4
LT		 4080 * by sysctl and we wouldn't want anyone to change it under our feet
4081 * (see SIOCSIFNAME).
1ab1457c 4082 */
1dab6222
PE		 4083 t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4084 if (!t->dev_name)
f68635e6 4085 goto free;
1da177e4 4086
1dab6222
PE		 4087 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
4088 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].ctl_name = ctl_name;
1da177e4 4089
bff16c2f 4090 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
1dab6222 4091 t->addrconf_vars);
1da177e4
LT		 4092 if (t->sysctl_header == NULL)
4093 goto free_procname;
f68635e6
PE		 4094
4095 p->sysctl = t;
95897312 4096 return 0;
1da177e4 4097
f68635e6 4098free_procname:
1dab6222 4099 kfree(t->dev_name);
f68635e6 4100free:
1da177e4 4101 kfree(t);
f68635e6 4102out:
95897312 4103 return -ENOBUFS;
1da177e4
LT		 4104}
4105
408c4768
PE		 4106static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4107{
4108 struct addrconf_sysctl_table *t;
4109
4110 if (p->sysctl == NULL)
4111 return;
4112
4113 t = p->sysctl;
4114 p->sysctl = NULL;
4115 unregister_sysctl_table(t->sysctl_header);
4116 kfree(t->dev_name);
4117 kfree(t);
4118}
4119
f52295a9
PE		 4120static void addrconf_sysctl_register(struct inet6_dev *idev)
4121{
408c4768
PE		 4122 neigh_sysctl_register(idev->dev, idev->nd_parms, NET_IPV6,
4123 NET_IPV6_NEIGH, "ipv6",
4124 &ndisc_ifinfo_sysctl_change,
4125 NULL);
bff16c2f
PE		 4126 __addrconf_sysctl_register(idev->dev->nd_net, idev->dev->name,
4127 idev->dev->ifindex, idev, &idev->cnf);
f52295a9
PE		 4128}
4129
408c4768 4130static void addrconf_sysctl_unregister(struct inet6_dev *idev)
1da177e4 4131{
408c4768
PE		 4132 __addrconf_sysctl_unregister(&idev->cnf);
4133 neigh_sysctl_unregister(idev->nd_parms);
1da177e4
LT		 4134}
4135
4136
4137#endif
4138
e0da5a48
PE		 4139static int addrconf_init_net(struct net *net)
4140{
4141 int err;
4142 struct ipv6_devconf *all, *dflt;
4143
4144 err = -ENOMEM;
4145 all = &ipv6_devconf;
4146 dflt = &ipv6_devconf_dflt;
4147
4148 if (net != &init_net) {
4149 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4150 if (all == NULL)
4151 goto err_alloc_all;
4152
4153 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4154 if (dflt == NULL)
4155 goto err_alloc_dflt;
4156 }
4157
4158 net->ipv6.devconf_all = all;
4159 net->ipv6.devconf_dflt = dflt;
4160
4161#ifdef CONFIG_SYSCTL
4162 err = __addrconf_sysctl_register(net, "all", NET_PROTO_CONF_ALL,
4163 NULL, all);
4164 if (err < 0)
4165 goto err_reg_all;
4166
4167 err = __addrconf_sysctl_register(net, "default", NET_PROTO_CONF_DEFAULT,
4168 NULL, dflt);
4169 if (err < 0)
4170 goto err_reg_dflt;
4171#endif
4172 return 0;
4173
4174#ifdef CONFIG_SYSCTL
4175err_reg_dflt:
4176 __addrconf_sysctl_unregister(all);
4177err_reg_all:
4178 kfree(dflt);
4179#endif
4180err_alloc_dflt:
4181 kfree(all);
4182err_alloc_all:
4183 return err;
4184}
4185
4186static void addrconf_exit_net(struct net *net)
4187{
4188#ifdef CONFIG_SYSCTL
4189 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4190 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4191#endif
4192 if (net != &init_net) {
4193 kfree(net->ipv6.devconf_dflt);
4194 kfree(net->ipv6.devconf_all);
4195 }
4196}
4197
4198static struct pernet_operations addrconf_ops = {
4199 .init = addrconf_init_net,
4200 .exit = addrconf_exit_net,
4201};
4202
1da177e4
LT		 4203/*
4204 * Device notifier
4205 */
4206
4207int register_inet6addr_notifier(struct notifier_block *nb)
4208{
1ab1457c 4209 return atomic_notifier_chain_register(&inet6addr_chain, nb);
1da177e4
LT		 4210}
4211
7159039a
YH		 4212EXPORT_SYMBOL(register_inet6addr_notifier);
4213
1da177e4
LT		 4214int unregister_inet6addr_notifier(struct notifier_block *nb)
4215{
1ab1457c 4216 return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
1da177e4
LT		 4217}
4218
7159039a
YH		 4219EXPORT_SYMBOL(unregister_inet6addr_notifier);
4220
1da177e4
LT		 4221/*
4222 * Init / cleanup code
4223 */
4224
4225int __init addrconf_init(void)
4226{
2a8cc6c8
YH		 4227 int err;
4228
4229 if ((err = ipv6_addr_label_init()) < 0) {
4230 printk(KERN_CRIT "IPv6 Addrconf: cannot initialize default policy table: %d.\n",
4231 err);
4232 return err;
4233 }
1da177e4 4234
e0da5a48
PE		 4235 register_pernet_subsys(&addrconf_ops);
4236
1da177e4
LT		 4237 /* The addrconf netdev notifier requires that loopback_dev
4238 * has it's ipv6 private information allocated and setup
4239 * before it can bring up and give link-local addresses
4240 * to other devices which are up.
4241 *
4242 * Unfortunately, loopback_dev is not necessarily the first
4243 * entry in the global dev_base list of net devices. In fact,
4244 * it is likely to be the very last entry on that list.
4245 * So this causes the notifier registry below to try and
4246 * give link-local addresses to all devices besides loopback_dev
4247 * first, then loopback_dev, which cases all the non-loopback_dev
4248 * devices to fail to get a link-local address.
4249 *
4250 * So, as a temporary fix, allocate the ipv6 structure for
4251 * loopback_dev first by hand.
4252 * Longer term, all of the dependencies ipv6 has upon the loopback
4253 * device and it being up should be removed.
4254 */
4255 rtnl_lock();
2774c7ab 4256 if (!ipv6_add_dev(init_net.loopback_dev))
1da177e4
LT		 4257 err = -ENOMEM;
4258 rtnl_unlock();
4259 if (err)
e0da5a48 4260 goto errlo;
1da177e4 4261
2774c7ab
EB		 4262 ip6_null_entry.u.dst.dev = init_net.loopback_dev;
4263 ip6_null_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev);
9a6bf6fe 4264#ifdef CONFIG_IPV6_MULTIPLE_TABLES
2774c7ab
EB		 4265 ip6_prohibit_entry.u.dst.dev = init_net.loopback_dev;
4266 ip6_prohibit_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev);
4267 ip6_blk_hole_entry.u.dst.dev = init_net.loopback_dev;
4268 ip6_blk_hole_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev);
9a6bf6fe 4269#endif
c62dba90 4270
1da177e4
LT		 4271 register_netdevice_notifier(&ipv6_dev_notf);
4272
1da177e4 4273 addrconf_verify(0);
c127ea2c
TG		 4274
4275 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4276 if (err < 0)
4277 goto errout;
4278
4279 /* Only the first call to __rtnl_register can fail */
4280 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4281 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4282 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4283 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4284 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4285
2a8cc6c8
YH		 4286 ipv6_addr_label_rtnl_register();
4287
1da177e4 4288 return 0;
c127ea2c
TG		 4289errout:
4290 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48
PE		 4291errlo:
4292 unregister_pernet_subsys(&addrconf_ops);
c127ea2c
TG		 4293
4294 return err;
1da177e4
LT		 4295}
4296
09f7709f 4297void addrconf_cleanup(void)
1da177e4 4298{
1ab1457c 4299 struct net_device *dev;
1ab1457c 4300 struct inet6_ifaddr *ifa;
1da177e4
LT		 4301 int i;
4302
4303 unregister_netdevice_notifier(&ipv6_dev_notf);
4304
e0da5a48 4305 unregister_pernet_subsys(&addrconf_ops);
1da177e4
LT		 4306
4307 rtnl_lock();
4308
4309 /*
4310 * clean dev list.
4311 */
4312
881d966b 4313 for_each_netdev(&init_net, dev) {
dffe4f04 4314 if (__in6_dev_get(dev) == NULL)
1da177e4
LT		 4315 continue;
4316 addrconf_ifdown(dev, 1);
4317 }
2774c7ab 4318 addrconf_ifdown(init_net.loopback_dev, 2);
1da177e4
LT		 4319
4320 /*
4321 * Check hash table.
4322 */
4323
4324 write_lock_bh(&addrconf_hash_lock);
4325 for (i=0; i < IN6_ADDR_HSIZE; i++) {
4326 for (ifa=inet6_addr_lst[i]; ifa; ) {
4327 struct inet6_ifaddr *bifa;
4328
4329 bifa = ifa;
4330 ifa = ifa->lst_next;
4331 printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
4332 /* Do not free it; something is wrong.
4333 Now we can investigate it with debugger.
4334 */
4335 }
4336 }
4337 write_unlock_bh(&addrconf_hash_lock);
4338
4339 del_timer(&addr_chk_timer);
4340
4341 rtnl_unlock();
1da177e4 4342}
Linux 6.x block layer and io_uring tree(s)