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[net-next-2.6.git] / net / ipv6 / addrconf.c
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1da177e4
LT		 1/*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
1ab1457c 6 * Pedro Roque <roque@di.fc.ul.pt>
1da177e4
LT		 7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
9 * $Id: addrconf.c,v 1.69 2001/10/31 21:55:54 davem Exp $
10 *
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License
13 * as published by the Free Software Foundation; either version
14 * 2 of the License, or (at your option) any later version.
15 */
16
17/*
18 * Changes:
19 *
20 * Janos Farkas : delete timer on ifdown
21 * <chexum@bankinf.banki.hu>
22 * Andi Kleen : kill double kfree on module
23 * unload.
24 * Maciej W. Rozycki : FDDI support
25 * sekiya@USAGI : Don't send too many RS
26 * packets.
27 * yoshfuji@USAGI : Fixed interval between DAD
28 * packets.
29 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
30 * address validation timer.
31 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
32 * support.
33 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
34 * address on a same interface.
35 * YOSHIFUJI Hideaki @USAGI : ARCnet support
36 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
37 * seq_file.
b1cacb68
YH		 38 * YOSHIFUJI Hideaki @USAGI : improved source address
39 * selection; consider scope,
40 * status etc.
1da177e4
LT		 41 */
42
1da177e4
LT		 43#include <linux/errno.h>
44#include <linux/types.h>
45#include <linux/socket.h>
46#include <linux/sockios.h>
1da177e4
LT		 47#include <linux/net.h>
48#include <linux/in6.h>
49#include <linux/netdevice.h>
1823730f 50#include <linux/if_addr.h>
1da177e4
LT		 51#include <linux/if_arp.h>
52#include <linux/if_arcnet.h>
53#include <linux/if_infiniband.h>
54#include <linux/route.h>
55#include <linux/inetdevice.h>
56#include <linux/init.h>
57#ifdef CONFIG_SYSCTL
58#include <linux/sysctl.h>
59#endif
4fc268d2 60#include <linux/capability.h>
1da177e4
LT		 61#include <linux/delay.h>
62#include <linux/notifier.h>
543537bd 63#include <linux/string.h>
1da177e4 64
457c4cbc 65#include <net/net_namespace.h>
1da177e4
LT		 66#include <net/sock.h>
67#include <net/snmp.h>
68
69#include <net/ipv6.h>
70#include <net/protocol.h>
71#include <net/ndisc.h>
72#include <net/ip6_route.h>
73#include <net/addrconf.h>
74#include <net/tcp.h>
75#include <net/ip.h>
5d620266 76#include <net/netlink.h>
f24e3d65 77#include <net/pkt_sched.h>
1da177e4
LT		 78#include <linux/if_tunnel.h>
79#include <linux/rtnetlink.h>
80
81#ifdef CONFIG_IPV6_PRIVACY
82#include <linux/random.h>
1da177e4
LT		 83#endif
84
85#include <asm/uaccess.h>
7f7d9a6b 86#include <asm/unaligned.h>
1da177e4
LT		 87
88#include <linux/proc_fs.h>
89#include <linux/seq_file.h>
90
91/* Set to 3 to get tracing... */
92#define ACONF_DEBUG 2
93
94#if ACONF_DEBUG >= 3
95#define ADBG(x) printk x
96#else
97#define ADBG(x)
98#endif
99
100#define INFINITY_LIFE_TIME 0xFFFFFFFF
101#define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b)))
102
103#ifdef CONFIG_SYSCTL
104static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p);
105static void addrconf_sysctl_unregister(struct ipv6_devconf *p);
106#endif
107
108#ifdef CONFIG_IPV6_PRIVACY
109static int __ipv6_regen_rndid(struct inet6_dev *idev);
1ab1457c 110static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
1da177e4
LT		 111static void ipv6_regen_rndid(unsigned long data);
112
113static int desync_factor = MAX_DESYNC_FACTOR * HZ;
1da177e4
LT		 114#endif
115
116static int ipv6_count_addresses(struct inet6_dev *idev);
117
118/*
119 * Configured unicast address hash table
120 */
121static struct inet6_ifaddr *inet6_addr_lst[IN6_ADDR_HSIZE];
122static DEFINE_RWLOCK(addrconf_hash_lock);
123
1da177e4
LT		 124static void addrconf_verify(unsigned long);
125
8d06afab 126static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
1da177e4
LT		 127static DEFINE_SPINLOCK(addrconf_verify_lock);
128
129static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
130static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
131
132static int addrconf_ifdown(struct net_device *dev, int how);
133
e431b8c0 134static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
1da177e4
LT		 135static void addrconf_dad_timer(unsigned long data);
136static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
c5e33bdd 137static void addrconf_dad_run(struct inet6_dev *idev);
1da177e4
LT		 138static void addrconf_rs_timer(unsigned long data);
139static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
140static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
141
1ab1457c 142static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 143 struct prefix_info *pinfo);
144static int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev);
145
e041c683 146static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
1da177e4 147
ab32ea5d 148struct ipv6_devconf ipv6_devconf __read_mostly = {
1da177e4
LT		 149 .forwarding = 0,
150 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
151 .mtu6 = IPV6_MIN_MTU,
152 .accept_ra = 1,
153 .accept_redirects = 1,
154 .autoconf = 1,
155 .force_mld_version = 0,
156 .dad_transmits = 1,
157 .rtr_solicits = MAX_RTR_SOLICITATIONS,
158 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
159 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
160#ifdef CONFIG_IPV6_PRIVACY
161 .use_tempaddr = 0,
162 .temp_valid_lft = TEMP_VALID_LIFETIME,
163 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
164 .regen_max_retry = REGEN_MAX_RETRY,
165 .max_desync_factor = MAX_DESYNC_FACTOR,
166#endif
167 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 168 .accept_ra_defrtr = 1,
c4fd30eb 169 .accept_ra_pinfo = 1,
930d6ff2
YH		 170#ifdef CONFIG_IPV6_ROUTER_PREF
171 .accept_ra_rtr_pref = 1,
52e16356 172 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 173#ifdef CONFIG_IPV6_ROUTE_INFO
174 .accept_ra_rt_info_max_plen = 0,
175#endif
930d6ff2 176#endif
fbea49e1 177 .proxy_ndp = 0,
0bcbc926 178 .accept_source_route = 0, /* we do not accept RH0 by default. */
1da177e4
LT		 179};
180
ab32ea5d 181static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
1da177e4
LT		 182 .forwarding = 0,
183 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
184 .mtu6 = IPV6_MIN_MTU,
185 .accept_ra = 1,
186 .accept_redirects = 1,
187 .autoconf = 1,
188 .dad_transmits = 1,
189 .rtr_solicits = MAX_RTR_SOLICITATIONS,
190 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
191 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
192#ifdef CONFIG_IPV6_PRIVACY
193 .use_tempaddr = 0,
194 .temp_valid_lft = TEMP_VALID_LIFETIME,
195 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
196 .regen_max_retry = REGEN_MAX_RETRY,
197 .max_desync_factor = MAX_DESYNC_FACTOR,
198#endif
199 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 200 .accept_ra_defrtr = 1,
c4fd30eb 201 .accept_ra_pinfo = 1,
930d6ff2
YH		 202#ifdef CONFIG_IPV6_ROUTER_PREF
203 .accept_ra_rtr_pref = 1,
52e16356 204 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 205#ifdef CONFIG_IPV6_ROUTE_INFO
206 .accept_ra_rt_info_max_plen = 0,
207#endif
930d6ff2 208#endif
fbea49e1 209 .proxy_ndp = 0,
0bcbc926 210 .accept_source_route = 0, /* we do not accept RH0 by default. */
1da177e4
LT		 211};
212
213/* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
1da177e4 214const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
1da177e4
LT		 215const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
216
f24e3d65
MC		 217/* Check if a valid qdisc is available */
218static inline int addrconf_qdisc_ok(struct net_device *dev)
219{
220 return (dev->qdisc != &noop_qdisc);
221}
222
1da177e4
LT		 223static void addrconf_del_timer(struct inet6_ifaddr *ifp)
224{
225 if (del_timer(&ifp->timer))
226 __in6_ifa_put(ifp);
227}
228
229enum addrconf_timer_t
230{
231 AC_NONE,
232 AC_DAD,
233 AC_RS,
234};
235
236static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
237 enum addrconf_timer_t what,
238 unsigned long when)
239{
240 if (!del_timer(&ifp->timer))
241 in6_ifa_hold(ifp);
242
243 switch (what) {
244 case AC_DAD:
245 ifp->timer.function = addrconf_dad_timer;
246 break;
247 case AC_RS:
248 ifp->timer.function = addrconf_rs_timer;
249 break;
250 default:;
251 }
252 ifp->timer.expires = jiffies + when;
253 add_timer(&ifp->timer);
254}
255
7f7d9a6b
HX		 256static int snmp6_alloc_dev(struct inet6_dev *idev)
257{
7f7d9a6b
HX		 258 if (snmp_mib_init((void **)idev->stats.ipv6,
259 sizeof(struct ipstats_mib),
260 __alignof__(struct ipstats_mib)) < 0)
261 goto err_ip;
262 if (snmp_mib_init((void **)idev->stats.icmpv6,
263 sizeof(struct icmpv6_mib),
264 __alignof__(struct icmpv6_mib)) < 0)
265 goto err_icmp;
14878f75
DS		 266 if (snmp_mib_init((void **)idev->stats.icmpv6msg,
267 sizeof(struct icmpv6msg_mib),
268 __alignof__(struct icmpv6msg_mib)) < 0)
269 goto err_icmpmsg;
7f7d9a6b
HX		 270
271 return 0;
272
14878f75
DS		 273err_icmpmsg:
274 snmp_mib_free((void **)idev->stats.icmpv6);
7f7d9a6b
HX		 275err_icmp:
276 snmp_mib_free((void **)idev->stats.ipv6);
277err_ip:
aaf70ec7 278 return -ENOMEM;
7f7d9a6b
HX		 279}
280
16910b98 281static void snmp6_free_dev(struct inet6_dev *idev)
7f7d9a6b 282{
14878f75 283 snmp_mib_free((void **)idev->stats.icmpv6msg);
7f7d9a6b
HX		 284 snmp_mib_free((void **)idev->stats.icmpv6);
285 snmp_mib_free((void **)idev->stats.ipv6);
7f7d9a6b
HX		 286}
287
1da177e4
LT		 288/* Nobody refers to this device, we may destroy it. */
289
8814c4b5
YH		 290static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
291{
292 struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
293 kfree(idev);
294}
295
1da177e4
LT		 296void in6_dev_finish_destroy(struct inet6_dev *idev)
297{
298 struct net_device *dev = idev->dev;
299 BUG_TRAP(idev->addr_list==NULL);
300 BUG_TRAP(idev->mc_list==NULL);
301#ifdef NET_REFCNT_DEBUG
302 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
303#endif
304 dev_put(dev);
305 if (!idev->dead) {
306 printk("Freeing alive inet6 device %p\n", idev);
307 return;
308 }
309 snmp6_free_dev(idev);
8814c4b5 310 call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
1da177e4
LT		 311}
312
7159039a
YH		 313EXPORT_SYMBOL(in6_dev_finish_destroy);
314
1da177e4
LT		 315static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
316{
317 struct inet6_dev *ndev;
d88ae4cc 318 struct in6_addr maddr;
1da177e4
LT		 319
320 ASSERT_RTNL();
321
322 if (dev->mtu < IPV6_MIN_MTU)
323 return NULL;
324
1ab1457c 325 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
322f74a4 326
1ab1457c
YH		 327 if (ndev == NULL)
328 return NULL;
322f74a4
IO		 329
330 rwlock_init(&ndev->lock);
331 ndev->dev = dev;
332 memcpy(&ndev->cnf, &ipv6_devconf_dflt, sizeof(ndev->cnf));
333 ndev->cnf.mtu6 = dev->mtu;
334 ndev->cnf.sysctl = NULL;
335 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
336 if (ndev->nd_parms == NULL) {
337 kfree(ndev);
338 return NULL;
339 }
340 /* We refer to the device */
341 dev_hold(dev);
1da177e4 342
322f74a4
IO		 343 if (snmp6_alloc_dev(ndev) < 0) {
344 ADBG((KERN_WARNING
345 "%s(): cannot allocate memory for statistics; dev=%s.\n",
346 __FUNCTION__, dev->name));
347 neigh_parms_release(&nd_tbl, ndev->nd_parms);
348 ndev->dead = 1;
349 in6_dev_finish_destroy(ndev);
350 return NULL;
351 }
1da177e4 352
322f74a4
IO		 353 if (snmp6_register_dev(ndev) < 0) {
354 ADBG((KERN_WARNING
355 "%s(): cannot create /proc/net/dev_snmp6/%s\n",
356 __FUNCTION__, dev->name));
357 neigh_parms_release(&nd_tbl, ndev->nd_parms);
358 ndev->dead = 1;
359 in6_dev_finish_destroy(ndev);
360 return NULL;
361 }
362
363 /* One reference from device. We must do this before
364 * we invoke __ipv6_regen_rndid().
365 */
366 in6_dev_hold(ndev);
1da177e4
LT		 367
368#ifdef CONFIG_IPV6_PRIVACY
322f74a4
IO		 369 init_timer(&ndev->regen_timer);
370 ndev->regen_timer.function = ipv6_regen_rndid;
371 ndev->regen_timer.data = (unsigned long) ndev;
372 if ((dev->flags&IFF_LOOPBACK) ||
373 dev->type == ARPHRD_TUNNEL ||
0be669bb
JR		 374#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
375 dev->type == ARPHRD_SIT ||
376#endif
377 dev->type == ARPHRD_NONE) {
322f74a4
IO		 378 printk(KERN_INFO
379 "%s: Disabled Privacy Extensions\n",
380 dev->name);
381 ndev->cnf.use_tempaddr = -1;
382 } else {
383 in6_dev_hold(ndev);
384 ipv6_regen_rndid((unsigned long) ndev);
385 }
1da177e4
LT		 386#endif
387
f24e3d65 388 if (netif_running(dev) && addrconf_qdisc_ok(dev))
53aadcc9
HX		 389 ndev->if_flags |= IF_READY;
390
322f74a4
IO		 391 ipv6_mc_init_dev(ndev);
392 ndev->tstamp = jiffies;
1da177e4 393#ifdef CONFIG_SYSCTL
322f74a4
IO		 394 neigh_sysctl_register(dev, ndev->nd_parms, NET_IPV6,
395 NET_IPV6_NEIGH, "ipv6",
396 &ndisc_ifinfo_sysctl_change,
397 NULL);
398 addrconf_sysctl_register(ndev, &ndev->cnf);
1da177e4 399#endif
30c4cf57
DS		 400 /* protected by rtnl_lock */
401 rcu_assign_pointer(dev->ip6_ptr, ndev);
d88ae4cc
YH		 402
403 /* Join all-node multicast group */
404 ipv6_addr_all_nodes(&maddr);
405 ipv6_dev_mc_inc(dev, &maddr);
406
1da177e4
LT		 407 return ndev;
408}
409
410static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
411{
412 struct inet6_dev *idev;
413
414 ASSERT_RTNL();
415
416 if ((idev = __in6_dev_get(dev)) == NULL) {
417 if ((idev = ipv6_add_dev(dev)) == NULL)
418 return NULL;
419 }
c5e33bdd 420
1da177e4
LT		 421 if (dev->flags&IFF_UP)
422 ipv6_mc_up(idev);
423 return idev;
424}
425
426#ifdef CONFIG_SYSCTL
427static void dev_forward_change(struct inet6_dev *idev)
428{
429 struct net_device *dev;
430 struct inet6_ifaddr *ifa;
431 struct in6_addr addr;
432
433 if (!idev)
434 return;
435 dev = idev->dev;
436 if (dev && (dev->flags & IFF_MULTICAST)) {
437 ipv6_addr_all_routers(&addr);
1ab1457c 438
1da177e4
LT		 439 if (idev->cnf.forwarding)
440 ipv6_dev_mc_inc(dev, &addr);
441 else
442 ipv6_dev_mc_dec(dev, &addr);
443 }
444 for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
2c12a74c
MW		 445 if (ifa->flags&IFA_F_TENTATIVE)
446 continue;
1da177e4
LT		 447 if (idev->cnf.forwarding)
448 addrconf_join_anycast(ifa);
449 else
450 addrconf_leave_anycast(ifa);
451 }
452}
453
454
455static void addrconf_forward_change(void)
456{
457 struct net_device *dev;
458 struct inet6_dev *idev;
459
460 read_lock(&dev_base_lock);
881d966b 461 for_each_netdev(&init_net, dev) {
8814c4b5 462 rcu_read_lock();
1da177e4
LT		 463 idev = __in6_dev_get(dev);
464 if (idev) {
465 int changed = (!idev->cnf.forwarding) ^ (!ipv6_devconf.forwarding);
466 idev->cnf.forwarding = ipv6_devconf.forwarding;
467 if (changed)
468 dev_forward_change(idev);
469 }
8814c4b5 470 rcu_read_unlock();
1da177e4
LT		 471 }
472 read_unlock(&dev_base_lock);
473}
474#endif
475
476/* Nobody refers to this ifaddr, destroy it */
477
478void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
479{
480 BUG_TRAP(ifp->if_next==NULL);
481 BUG_TRAP(ifp->lst_next==NULL);
482#ifdef NET_REFCNT_DEBUG
483 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
484#endif
485
486 in6_dev_put(ifp->idev);
487
488 if (del_timer(&ifp->timer))
489 printk("Timer is still running, when freeing ifa=%p\n", ifp);
490
491 if (!ifp->dead) {
492 printk("Freeing alive inet6 address %p\n", ifp);
493 return;
494 }
495 dst_release(&ifp->rt->u.dst);
496
497 kfree(ifp);
498}
499
e55ffac6
BH		 500static void
501ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
502{
503 struct inet6_ifaddr *ifa, **ifap;
8a6ce0c0 504 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
e55ffac6
BH		 505
506 /*
507 * Each device address list is sorted in order of scope -
508 * global before linklocal.
509 */
510 for (ifap = &idev->addr_list; (ifa = *ifap) != NULL;
511 ifap = &ifa->if_next) {
8a6ce0c0 512 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
e55ffac6
BH		 513 break;
514 }
515
516 ifp->if_next = *ifap;
517 *ifap = ifp;
518}
519
1da177e4
LT		 520/* On success it returns ifp with increased reference count */
521
522static struct inet6_ifaddr *
523ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
e431b8c0 524 int scope, u32 flags)
1da177e4
LT		 525{
526 struct inet6_ifaddr *ifa = NULL;
527 struct rt6_info *rt;
528 int hash;
529 int err = 0;
530
8814c4b5 531 rcu_read_lock_bh();
1da177e4
LT		 532 if (idev->dead) {
533 err = -ENODEV; /*XXX*/
534 goto out2;
535 }
536
537 write_lock(&addrconf_hash_lock);
538
539 /* Ignore adding duplicate addresses on an interface */
540 if (ipv6_chk_same_addr(addr, idev->dev)) {
541 ADBG(("ipv6_add_addr: already assigned\n"));
542 err = -EEXIST;
543 goto out;
544 }
545
322f74a4 546 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
1da177e4
LT		 547
548 if (ifa == NULL) {
549 ADBG(("ipv6_add_addr: malloc failed\n"));
550 err = -ENOBUFS;
551 goto out;
552 }
553
554 rt = addrconf_dst_alloc(idev, addr, 0);
555 if (IS_ERR(rt)) {
556 err = PTR_ERR(rt);
557 goto out;
558 }
559
1da177e4
LT		 560 ipv6_addr_copy(&ifa->addr, addr);
561
562 spin_lock_init(&ifa->lock);
563 init_timer(&ifa->timer);
564 ifa->timer.data = (unsigned long) ifa;
565 ifa->scope = scope;
566 ifa->prefix_len = pfxlen;
567 ifa->flags = flags | IFA_F_TENTATIVE;
568 ifa->cstamp = ifa->tstamp = jiffies;
569
57f5f544
KF		 570 ifa->rt = rt;
571
95c385b4
NH		 572 /*
573 * part one of RFC 4429, section 3.3
574 * We should not configure an address as
575 * optimistic if we do not yet know the link
576 * layer address of our nexhop router
577 */
578
579 if (rt->rt6i_nexthop == NULL)
580 ifa->flags &= ~IFA_F_OPTIMISTIC;
581
1da177e4
LT		 582 ifa->idev = idev;
583 in6_dev_hold(idev);
584 /* For caller */
585 in6_ifa_hold(ifa);
586
587 /* Add to big hash table */
588 hash = ipv6_addr_hash(addr);
589
590 ifa->lst_next = inet6_addr_lst[hash];
591 inet6_addr_lst[hash] = ifa;
592 in6_ifa_hold(ifa);
593 write_unlock(&addrconf_hash_lock);
594
595 write_lock(&idev->lock);
596 /* Add to inet6_dev unicast addr list. */
e55ffac6 597 ipv6_link_dev_addr(idev, ifa);
1da177e4
LT		 598
599#ifdef CONFIG_IPV6_PRIVACY
600 if (ifa->flags&IFA_F_TEMPORARY) {
601 ifa->tmp_next = idev->tempaddr_list;
602 idev->tempaddr_list = ifa;
603 in6_ifa_hold(ifa);
604 }
605#endif
606
1da177e4
LT		 607 in6_ifa_hold(ifa);
608 write_unlock(&idev->lock);
609out2:
8814c4b5 610 rcu_read_unlock_bh();
1da177e4 611
fd92833a 612 if (likely(err == 0))
e041c683 613 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
1da177e4
LT		 614 else {
615 kfree(ifa);
616 ifa = ERR_PTR(err);
617 }
618
619 return ifa;
620out:
621 write_unlock(&addrconf_hash_lock);
622 goto out2;
623}
624
625/* This function wants to get referenced ifp and releases it before return */
626
627static void ipv6_del_addr(struct inet6_ifaddr *ifp)
628{
629 struct inet6_ifaddr *ifa, **ifap;
630 struct inet6_dev *idev = ifp->idev;
631 int hash;
632 int deleted = 0, onlink = 0;
633 unsigned long expires = jiffies;
634
635 hash = ipv6_addr_hash(&ifp->addr);
636
637 ifp->dead = 1;
638
639 write_lock_bh(&addrconf_hash_lock);
640 for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
641 ifap = &ifa->lst_next) {
642 if (ifa == ifp) {
643 *ifap = ifa->lst_next;
644 __in6_ifa_put(ifp);
645 ifa->lst_next = NULL;
646 break;
647 }
648 }
649 write_unlock_bh(&addrconf_hash_lock);
650
651 write_lock_bh(&idev->lock);
652#ifdef CONFIG_IPV6_PRIVACY
653 if (ifp->flags&IFA_F_TEMPORARY) {
654 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
655 ifap = &ifa->tmp_next) {
656 if (ifa == ifp) {
657 *ifap = ifa->tmp_next;
658 if (ifp->ifpub) {
659 in6_ifa_put(ifp->ifpub);
660 ifp->ifpub = NULL;
661 }
662 __in6_ifa_put(ifp);
663 ifa->tmp_next = NULL;
664 break;
665 }
666 }
667 }
668#endif
669
1d142804 670 for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
1da177e4
LT		 671 if (ifa == ifp) {
672 *ifap = ifa->if_next;
673 __in6_ifa_put(ifp);
674 ifa->if_next = NULL;
675 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
676 break;
677 deleted = 1;
1d142804 678 continue;
1da177e4
LT		 679 } else if (ifp->flags & IFA_F_PERMANENT) {
680 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
681 ifp->prefix_len)) {
682 if (ifa->flags & IFA_F_PERMANENT) {
683 onlink = 1;
684 if (deleted)
685 break;
686 } else {
687 unsigned long lifetime;
688
689 if (!onlink)
690 onlink = -1;
691
692 spin_lock(&ifa->lock);
693 lifetime = min_t(unsigned long,
694 ifa->valid_lft, 0x7fffffffUL/HZ);
695 if (time_before(expires,
696 ifa->tstamp + lifetime * HZ))
697 expires = ifa->tstamp + lifetime * HZ;
698 spin_unlock(&ifa->lock);
699 }
700 }
701 }
1d142804 702 ifap = &ifa->if_next;
1da177e4
LT		 703 }
704 write_unlock_bh(&idev->lock);
705
706 ipv6_ifa_notify(RTM_DELADDR, ifp);
707
e041c683 708 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
1da177e4
LT		 709
710 addrconf_del_timer(ifp);
711
712 /*
713 * Purge or update corresponding prefix
714 *
715 * 1) we don't purge prefix here if address was not permanent.
716 * prefix is managed by its own lifetime.
717 * 2) if there're no addresses, delete prefix.
718 * 3) if there're still other permanent address(es),
719 * corresponding prefix is still permanent.
720 * 4) otherwise, update prefix lifetime to the
721 * longest valid lifetime among the corresponding
722 * addresses on the device.
723 * Note: subsequent RA will update lifetime.
724 *
725 * --yoshfuji
726 */
727 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
728 struct in6_addr prefix;
729 struct rt6_info *rt;
730
731 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
732 rt = rt6_lookup(&prefix, NULL, ifp->idev->dev->ifindex, 1);
733
734 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
735 if (onlink == 0) {
e0a1ad73 736 ip6_del_rt(rt);
1da177e4
LT		 737 rt = NULL;
738 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
739 rt->rt6i_expires = expires;
740 rt->rt6i_flags |= RTF_EXPIRES;
741 }
742 }
743 dst_release(&rt->u.dst);
744 }
745
746 in6_ifa_put(ifp);
747}
748
749#ifdef CONFIG_IPV6_PRIVACY
750static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
751{
752 struct inet6_dev *idev = ifp->idev;
753 struct in6_addr addr, *tmpaddr;
754 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
755 int tmp_plen;
756 int ret = 0;
757 int max_addresses;
95c385b4 758 u32 addr_flags;
1da177e4
LT		 759
760 write_lock(&idev->lock);
761 if (ift) {
762 spin_lock_bh(&ift->lock);
763 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
764 spin_unlock_bh(&ift->lock);
765 tmpaddr = &addr;
766 } else {
767 tmpaddr = NULL;
768 }
769retry:
770 in6_dev_hold(idev);
771 if (idev->cnf.use_tempaddr <= 0) {
772 write_unlock(&idev->lock);
773 printk(KERN_INFO
774 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
775 in6_dev_put(idev);
776 ret = -1;
777 goto out;
778 }
779 spin_lock_bh(&ifp->lock);
780 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
781 idev->cnf.use_tempaddr = -1; /*XXX*/
782 spin_unlock_bh(&ifp->lock);
783 write_unlock(&idev->lock);
784 printk(KERN_WARNING
785 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
786 in6_dev_put(idev);
787 ret = -1;
788 goto out;
789 }
790 in6_ifa_hold(ifp);
791 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
792 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
793 spin_unlock_bh(&ifp->lock);
794 write_unlock(&idev->lock);
795 printk(KERN_WARNING
796 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
797 in6_ifa_put(ifp);
798 in6_dev_put(idev);
799 ret = -1;
800 goto out;
801 }
802 memcpy(&addr.s6_addr[8], idev->rndid, 8);
803 tmp_valid_lft = min_t(__u32,
804 ifp->valid_lft,
805 idev->cnf.temp_valid_lft);
1ab1457c
YH		 806 tmp_prefered_lft = min_t(__u32,
807 ifp->prefered_lft,
1da177e4
LT		 808 idev->cnf.temp_prefered_lft - desync_factor / HZ);
809 tmp_plen = ifp->prefix_len;
810 max_addresses = idev->cnf.max_addresses;
811 tmp_cstamp = ifp->cstamp;
812 tmp_tstamp = ifp->tstamp;
813 spin_unlock_bh(&ifp->lock);
814
815 write_unlock(&idev->lock);
95c385b4
NH		 816
817 addr_flags = IFA_F_TEMPORARY;
818 /* set in addrconf_prefix_rcv() */
819 if (ifp->flags & IFA_F_OPTIMISTIC)
820 addr_flags |= IFA_F_OPTIMISTIC;
821
1da177e4 822 ift = !max_addresses ||
1ab1457c 823 ipv6_count_addresses(idev) < max_addresses ?
1da177e4 824 ipv6_add_addr(idev, &addr, tmp_plen,
95c385b4
NH		 825 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
826 addr_flags) : NULL;
1da177e4
LT		 827 if (!ift || IS_ERR(ift)) {
828 in6_ifa_put(ifp);
829 in6_dev_put(idev);
830 printk(KERN_INFO
831 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
832 tmpaddr = &addr;
833 write_lock(&idev->lock);
834 goto retry;
835 }
836
837 spin_lock_bh(&ift->lock);
838 ift->ifpub = ifp;
839 ift->valid_lft = tmp_valid_lft;
840 ift->prefered_lft = tmp_prefered_lft;
841 ift->cstamp = tmp_cstamp;
842 ift->tstamp = tmp_tstamp;
843 spin_unlock_bh(&ift->lock);
844
845 addrconf_dad_start(ift, 0);
846 in6_ifa_put(ift);
847 in6_dev_put(idev);
848out:
849 return ret;
850}
851#endif
852
853/*
072047e4 854 * Choose an appropriate source address (RFC3484)
1da177e4 855 */
072047e4
YH		 856struct ipv6_saddr_score {
857 int addr_type;
858 unsigned int attrs;
859 int matchlen;
0d27b427 860 int scope;
072047e4
YH		 861 unsigned int rule;
862};
863
864#define IPV6_SADDR_SCORE_LOCAL 0x0001
865#define IPV6_SADDR_SCORE_PREFERRED 0x0004
866#define IPV6_SADDR_SCORE_HOA 0x0008
867#define IPV6_SADDR_SCORE_OIF 0x0010
868#define IPV6_SADDR_SCORE_LABEL 0x0020
869#define IPV6_SADDR_SCORE_PRIVACY 0x0040
870
b6f99a21 871static inline int ipv6_saddr_preferred(int type)
1da177e4 872{
072047e4
YH		 873 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
874 IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
875 return 1;
876 return 0;
1da177e4
LT		 877}
878
072047e4 879/* static matching label */
b6f99a21 880static inline int ipv6_saddr_label(const struct in6_addr *addr, int type)
072047e4
YH		 881{
882 /*
883 * prefix (longest match) label
884 * -----------------------------
885 * ::1/128 0
886 * ::/0 1
887 * 2002::/16 2
888 * ::/96 3
889 * ::ffff:0:0/96 4
102128e3
ŁS		 890 * fc00::/7 5
891 * 2001::/32 6
072047e4
YH		 892 */
893 if (type & IPV6_ADDR_LOOPBACK)
894 return 0;
895 else if (type & IPV6_ADDR_COMPATv4)
896 return 3;
897 else if (type & IPV6_ADDR_MAPPED)
898 return 4;
102128e3
ŁS		 899 else if (addr->s6_addr32[0] == htonl(0x20010000))
900 return 6;
072047e4
YH		 901 else if (addr->s6_addr16[0] == htons(0x2002))
902 return 2;
102128e3
ŁS		 903 else if ((addr->s6_addr[0] & 0xfe) == 0xfc)
904 return 5;
072047e4
YH		 905 return 1;
906}
1da177e4 907
072047e4 908int ipv6_dev_get_saddr(struct net_device *daddr_dev,
1da177e4
LT		 909 struct in6_addr *daddr, struct in6_addr *saddr)
910{
072047e4
YH		 911 struct ipv6_saddr_score hiscore;
912 struct inet6_ifaddr *ifa_result = NULL;
913 int daddr_type = __ipv6_addr_type(daddr);
914 int daddr_scope = __ipv6_addr_src_scope(daddr_type);
915 u32 daddr_label = ipv6_saddr_label(daddr, daddr_type);
916 struct net_device *dev;
1da177e4 917
072047e4 918 memset(&hiscore, 0, sizeof(hiscore));
1da177e4 919
072047e4 920 read_lock(&dev_base_lock);
8814c4b5 921 rcu_read_lock();
1da177e4 922
881d966b 923 for_each_netdev(&init_net, dev) {
072047e4
YH		 924 struct inet6_dev *idev;
925 struct inet6_ifaddr *ifa;
926
927 /* Rule 0: Candidate Source Address (section 4)
928 * - multicast and link-local destination address,
929 * the set of candidate source address MUST only
930 * include addresses assigned to interfaces
931 * belonging to the same link as the outgoing
932 * interface.
933 * (- For site-local destination addresses, the
934 * set of candidate source addresses MUST only
935 * include addresses assigned to interfaces
936 * belonging to the same site as the outgoing
937 * interface.)
938 */
939 if ((daddr_type & IPV6_ADDR_MULTICAST ||
940 daddr_scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
941 daddr_dev && dev != daddr_dev)
942 continue;
1da177e4 943
1da177e4 944 idev = __in6_dev_get(dev);
072047e4
YH		 945 if (!idev)
946 continue;
947
948 read_lock_bh(&idev->lock);
949 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
950 struct ipv6_saddr_score score;
951
952 score.addr_type = __ipv6_addr_type(&ifa->addr);
953
6b3ae80a
YH		 954 /* Rule 0:
955 * - Tentative Address (RFC2462 section 5.4)
956 * - A tentative address is not considered
957 * "assigned to an interface" in the traditional
95c385b4 958 * sense, unless it is also flagged as optimistic.
6b3ae80a 959 * - Candidate Source Address (section 4)
072047e4
YH		 960 * - In any case, anycast addresses, multicast
961 * addresses, and the unspecified address MUST
962 * NOT be included in a candidate set.
963 */
95c385b4
NH		 964 if ((ifa->flags & IFA_F_TENTATIVE) &&
965 (!(ifa->flags & IFA_F_OPTIMISTIC)))
6b3ae80a 966 continue;
072047e4
YH		 967 if (unlikely(score.addr_type == IPV6_ADDR_ANY ||
968 score.addr_type & IPV6_ADDR_MULTICAST)) {
969 LIMIT_NETDEBUG(KERN_DEBUG
3b6d821c 970 "ADDRCONF: unspecified / multicast address "
072047e4
YH		 971 "assigned as unicast address on %s",
972 dev->name);
973 continue;
974 }
975
976 score.attrs = 0;
977 score.matchlen = 0;
978 score.scope = 0;
979 score.rule = 0;
980
981 if (ifa_result == NULL) {
982 /* record it if the first available entry */
983 goto record_it;
984 }
985
986 /* Rule 1: Prefer same address */
987 if (hiscore.rule < 1) {
988 if (ipv6_addr_equal(&ifa_result->addr, daddr))
989 hiscore.attrs |= IPV6_SADDR_SCORE_LOCAL;
990 hiscore.rule++;
991 }
992 if (ipv6_addr_equal(&ifa->addr, daddr)) {
993 score.attrs |= IPV6_SADDR_SCORE_LOCAL;
994 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)) {
995 score.rule = 1;
996 goto record_it;
1da177e4 997 }
072047e4
YH		 998 } else {
999 if (hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)
1000 continue;
1da177e4 1001 }
1da177e4 1002
072047e4
YH		 1003 /* Rule 2: Prefer appropriate scope */
1004 if (hiscore.rule < 2) {
1005 hiscore.scope = __ipv6_addr_src_scope(hiscore.addr_type);
1006 hiscore.rule++;
1007 }
1008 score.scope = __ipv6_addr_src_scope(score.addr_type);
1009 if (hiscore.scope < score.scope) {
1010 if (hiscore.scope < daddr_scope) {
1011 score.rule = 2;
1012 goto record_it;
1013 } else
1014 continue;
1015 } else if (score.scope < hiscore.scope) {
1016 if (score.scope < daddr_scope)
e55ffac6 1017 break; /* addresses sorted by scope */
072047e4
YH		 1018 else {
1019 score.rule = 2;
1020 goto record_it;
1021 }
1022 }
1da177e4 1023
95c385b4 1024 /* Rule 3: Avoid deprecated and optimistic addresses */
072047e4
YH		 1025 if (hiscore.rule < 3) {
1026 if (ipv6_saddr_preferred(hiscore.addr_type) ||
95c385b4
NH		 1027 (((ifa_result->flags &
1028 (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)) == 0)))
072047e4
YH		 1029 hiscore.attrs |= IPV6_SADDR_SCORE_PREFERRED;
1030 hiscore.rule++;
1031 }
1032 if (ipv6_saddr_preferred(score.addr_type) ||
6ae5f983 1033 (((ifa->flags &
95c385b4 1034 (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)) == 0))) {
072047e4
YH		 1035 score.attrs |= IPV6_SADDR_SCORE_PREFERRED;
1036 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)) {
1037 score.rule = 3;
1038 goto record_it;
1039 }
1040 } else {
1041 if (hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)
1042 continue;
1043 }
1da177e4 1044
3b9f9a1c 1045 /* Rule 4: Prefer home address */
59fbb3a6 1046#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3b9f9a1c
NT		 1047 if (hiscore.rule < 4) {
1048 if (ifa_result->flags & IFA_F_HOMEADDRESS)
1049 hiscore.attrs |= IPV6_SADDR_SCORE_HOA;
1050 hiscore.rule++;
1051 }
1052 if (ifa->flags & IFA_F_HOMEADDRESS) {
1053 score.attrs |= IPV6_SADDR_SCORE_HOA;
1054 if (!(ifa_result->flags & IFA_F_HOMEADDRESS)) {
1055 score.rule = 4;
1056 goto record_it;
1057 }
1058 } else {
1059 if (hiscore.attrs & IPV6_SADDR_SCORE_HOA)
1060 continue;
1061 }
1062#else
220bbd74
YH		 1063 if (hiscore.rule < 4)
1064 hiscore.rule++;
3b9f9a1c 1065#endif
072047e4
YH		 1066
1067 /* Rule 5: Prefer outgoing interface */
1068 if (hiscore.rule < 5) {
1069 if (daddr_dev == NULL ||
1070 daddr_dev == ifa_result->idev->dev)
1071 hiscore.attrs |= IPV6_SADDR_SCORE_OIF;
1072 hiscore.rule++;
1073 }
1074 if (daddr_dev == NULL ||
1075 daddr_dev == ifa->idev->dev) {
1076 score.attrs |= IPV6_SADDR_SCORE_OIF;
1077 if (!(hiscore.attrs & IPV6_SADDR_SCORE_OIF)) {
1078 score.rule = 5;
1079 goto record_it;
1080 }
1081 } else {
1082 if (hiscore.attrs & IPV6_SADDR_SCORE_OIF)
1083 continue;
1084 }
1085
1086 /* Rule 6: Prefer matching label */
1087 if (hiscore.rule < 6) {
1088 if (ipv6_saddr_label(&ifa_result->addr, hiscore.addr_type) == daddr_label)
1089 hiscore.attrs |= IPV6_SADDR_SCORE_LABEL;
1090 hiscore.rule++;
1091 }
1092 if (ipv6_saddr_label(&ifa->addr, score.addr_type) == daddr_label) {
1093 score.attrs |= IPV6_SADDR_SCORE_LABEL;
1094 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LABEL)) {
1095 score.rule = 6;
1096 goto record_it;
1da177e4 1097 }
072047e4
YH		 1098 } else {
1099 if (hiscore.attrs & IPV6_SADDR_SCORE_LABEL)
1100 continue;
1101 }
1102
44fd0261 1103#ifdef CONFIG_IPV6_PRIVACY
072047e4
YH		 1104 /* Rule 7: Prefer public address
1105 * Note: prefer temprary address if use_tempaddr >= 2
1106 */
1107 if (hiscore.rule < 7) {
1108 if ((!(ifa_result->flags & IFA_F_TEMPORARY)) ^
1109 (ifa_result->idev->cnf.use_tempaddr >= 2))
1110 hiscore.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1111 hiscore.rule++;
1112 }
1113 if ((!(ifa->flags & IFA_F_TEMPORARY)) ^
1114 (ifa->idev->cnf.use_tempaddr >= 2)) {
1115 score.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1116 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)) {
1117 score.rule = 7;
1118 goto record_it;
1119 }
1120 } else {
1121 if (hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)
1122 continue;
1123 }
5e2707fa
YH		 1124#else
1125 if (hiscore.rule < 7)
1126 hiscore.rule++;
44fd0261 1127#endif
072047e4 1128 /* Rule 8: Use longest matching prefix */
12da2a43 1129 if (hiscore.rule < 8) {
072047e4 1130 hiscore.matchlen = ipv6_addr_diff(&ifa_result->addr, daddr);
12da2a43
YZ		 1131 hiscore.rule++;
1132 }
072047e4
YH		 1133 score.matchlen = ipv6_addr_diff(&ifa->addr, daddr);
1134 if (score.matchlen > hiscore.matchlen) {
1135 score.rule = 8;
1136 goto record_it;
1da177e4 1137 }
072047e4
YH		 1138#if 0
1139 else if (score.matchlen < hiscore.matchlen)
1140 continue;
1141#endif
1142
1143 /* Final Rule: choose first available one */
1144 continue;
1145record_it:
1146 if (ifa_result)
1147 in6_ifa_put(ifa_result);
1148 in6_ifa_hold(ifa);
1149 ifa_result = ifa;
1150 hiscore = score;
1da177e4 1151 }
072047e4 1152 read_unlock_bh(&idev->lock);
1da177e4 1153 }
8814c4b5 1154 rcu_read_unlock();
1da177e4
LT		 1155 read_unlock(&dev_base_lock);
1156
072047e4
YH		 1157 if (!ifa_result)
1158 return -EADDRNOTAVAIL;
1ab1457c 1159
072047e4
YH		 1160 ipv6_addr_copy(saddr, &ifa_result->addr);
1161 in6_ifa_put(ifa_result);
1162 return 0;
1da177e4
LT		 1163}
1164
1165
1166int ipv6_get_saddr(struct dst_entry *dst,
1167 struct in6_addr *daddr, struct in6_addr *saddr)
1168{
7a3025b1 1169 return ipv6_dev_get_saddr(dst ? ip6_dst_idev(dst)->dev : NULL, daddr, saddr);
1da177e4
LT		 1170}
1171
7159039a 1172EXPORT_SYMBOL(ipv6_get_saddr);
1da177e4 1173
95c385b4
NH		 1174int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1175 unsigned char banned_flags)
1da177e4
LT		 1176{
1177 struct inet6_dev *idev;
1178 int err = -EADDRNOTAVAIL;
1179
8814c4b5 1180 rcu_read_lock();
1da177e4
LT		 1181 if ((idev = __in6_dev_get(dev)) != NULL) {
1182 struct inet6_ifaddr *ifp;
1183
1184 read_lock_bh(&idev->lock);
1185 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
95c385b4 1186 if (ifp->scope == IFA_LINK && !(ifp->flags & banned_flags)) {
1da177e4
LT		 1187 ipv6_addr_copy(addr, &ifp->addr);
1188 err = 0;
1189 break;
1190 }
1191 }
1192 read_unlock_bh(&idev->lock);
1193 }
8814c4b5 1194 rcu_read_unlock();
1da177e4
LT		 1195 return err;
1196}
1197
1198static int ipv6_count_addresses(struct inet6_dev *idev)
1199{
1200 int cnt = 0;
1201 struct inet6_ifaddr *ifp;
1202
1203 read_lock_bh(&idev->lock);
1204 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1205 cnt++;
1206 read_unlock_bh(&idev->lock);
1207 return cnt;
1208}
1209
1210int ipv6_chk_addr(struct in6_addr *addr, struct net_device *dev, int strict)
1211{
1212 struct inet6_ifaddr * ifp;
1213 u8 hash = ipv6_addr_hash(addr);
1214
1215 read_lock_bh(&addrconf_hash_lock);
1216 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1217 if (ipv6_addr_equal(&ifp->addr, addr) &&
1218 !(ifp->flags&IFA_F_TENTATIVE)) {
1219 if (dev == NULL || ifp->idev->dev == dev ||
1220 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1221 break;
1222 }
1223 }
1224 read_unlock_bh(&addrconf_hash_lock);
1225 return ifp != NULL;
1226}
1227
7159039a
YH		 1228EXPORT_SYMBOL(ipv6_chk_addr);
1229
1da177e4
LT		 1230static
1231int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev)
1232{
1233 struct inet6_ifaddr * ifp;
1234 u8 hash = ipv6_addr_hash(addr);
1235
1236 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1237 if (ipv6_addr_equal(&ifp->addr, addr)) {
1238 if (dev == NULL || ifp->idev->dev == dev)
1239 break;
1240 }
1241 }
1242 return ifp != NULL;
1243}
1244
1245struct inet6_ifaddr * ipv6_get_ifaddr(struct in6_addr *addr, struct net_device *dev, int strict)
1246{
1247 struct inet6_ifaddr * ifp;
1248 u8 hash = ipv6_addr_hash(addr);
1249
1250 read_lock_bh(&addrconf_hash_lock);
1251 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1252 if (ipv6_addr_equal(&ifp->addr, addr)) {
1253 if (dev == NULL || ifp->idev->dev == dev ||
1254 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1255 in6_ifa_hold(ifp);
1256 break;
1257 }
1258 }
1259 }
1260 read_unlock_bh(&addrconf_hash_lock);
1261
1262 return ifp;
1263}
1264
1265int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1266{
1267 const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
0fa1a53e 1268 const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
82103232
AV		 1269 __be32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
1270 __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1da177e4 1271 int sk_ipv6only = ipv6_only_sock(sk);
463c84b9 1272 int sk2_ipv6only = inet_v6_ipv6only(sk2);
1da177e4
LT		 1273 int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1274 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1275
1276 if (!sk2_rcv_saddr && !sk_ipv6only)
1277 return 1;
1278
1279 if (addr_type2 == IPV6_ADDR_ANY &&
1280 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1281 return 1;
1282
1283 if (addr_type == IPV6_ADDR_ANY &&
1284 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1285 return 1;
1286
1287 if (sk2_rcv_saddr6 &&
1288 ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1289 return 1;
1290
1291 if (addr_type == IPV6_ADDR_MAPPED &&
1292 !sk2_ipv6only &&
1293 (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1294 return 1;
1295
1296 return 0;
1297}
1298
1299/* Gets referenced address, destroys ifaddr */
1300
9f5336e2 1301static void addrconf_dad_stop(struct inet6_ifaddr *ifp)
1da177e4 1302{
1da177e4
LT		 1303 if (ifp->flags&IFA_F_PERMANENT) {
1304 spin_lock_bh(&ifp->lock);
1305 addrconf_del_timer(ifp);
1306 ifp->flags |= IFA_F_TENTATIVE;
1307 spin_unlock_bh(&ifp->lock);
1308 in6_ifa_put(ifp);
1309#ifdef CONFIG_IPV6_PRIVACY
1310 } else if (ifp->flags&IFA_F_TEMPORARY) {
1311 struct inet6_ifaddr *ifpub;
1312 spin_lock_bh(&ifp->lock);
1313 ifpub = ifp->ifpub;
1314 if (ifpub) {
1315 in6_ifa_hold(ifpub);
1316 spin_unlock_bh(&ifp->lock);
1317 ipv6_create_tempaddr(ifpub, ifp);
1318 in6_ifa_put(ifpub);
1319 } else {
1320 spin_unlock_bh(&ifp->lock);
1321 }
1322 ipv6_del_addr(ifp);
1323#endif
1324 } else
1325 ipv6_del_addr(ifp);
1326}
1327
3c21edbd
YH		 1328void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1329{
1330 if (net_ratelimit())
1331 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1332 addrconf_dad_stop(ifp);
1333}
1da177e4
LT		 1334
1335/* Join to solicited addr multicast group. */
1336
1337void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1338{
1339 struct in6_addr maddr;
1340
1341 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1342 return;
1343
1344 addrconf_addr_solict_mult(addr, &maddr);
1345 ipv6_dev_mc_inc(dev, &maddr);
1346}
1347
1348void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1349{
1350 struct in6_addr maddr;
1351
1352 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1353 return;
1354
1355 addrconf_addr_solict_mult(addr, &maddr);
1356 __ipv6_dev_mc_dec(idev, &maddr);
1357}
1358
20380731 1359static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1360{
1361 struct in6_addr addr;
1362 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1363 if (ipv6_addr_any(&addr))
1364 return;
1365 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1366}
1367
20380731 1368static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1369{
1370 struct in6_addr addr;
1371 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1372 if (ipv6_addr_any(&addr))
1373 return;
1374 __ipv6_dev_ac_dec(ifp->idev, &addr);
1375}
1376
073a8e0e
YH		 1377static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1378{
1379 if (dev->addr_len != ETH_ALEN)
1380 return -1;
1381 memcpy(eui, dev->dev_addr, 3);
1382 memcpy(eui + 5, dev->dev_addr + 3, 3);
1383
1384 /*
1385 * The zSeries OSA network cards can be shared among various
1386 * OS instances, but the OSA cards have only one MAC address.
1387 * This leads to duplicate address conflicts in conjunction
1388 * with IPv6 if more than one instance uses the same card.
1389 *
1390 * The driver for these cards can deliver a unique 16-bit
1391 * identifier for each instance sharing the same card. It is
1392 * placed instead of 0xFFFE in the interface identifier. The
1393 * "u" bit of the interface identifier is not inverted in this
1394 * case. Hence the resulting interface identifier has local
1395 * scope according to RFC2373.
1396 */
1397 if (dev->dev_id) {
1398 eui[3] = (dev->dev_id >> 8) & 0xFF;
1399 eui[4] = dev->dev_id & 0xFF;
1400 } else {
1401 eui[3] = 0xFF;
1402 eui[4] = 0xFE;
1403 eui[0] ^= 2;
1404 }
1405 return 0;
1406}
1407
1408static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1409{
1410 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1411 if (dev->addr_len != ARCNET_ALEN)
1412 return -1;
1413 memset(eui, 0, 7);
1414 eui[7] = *(u8*)dev->dev_addr;
1415 return 0;
1416}
1417
1418static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1419{
1420 if (dev->addr_len != INFINIBAND_ALEN)
1421 return -1;
1422 memcpy(eui, dev->dev_addr + 12, 8);
1423 eui[0] |= 2;
1424 return 0;
1425}
1426
1da177e4
LT		 1427static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1428{
1429 switch (dev->type) {
1430 case ARPHRD_ETHER:
1431 case ARPHRD_FDDI:
1432 case ARPHRD_IEEE802_TR:
073a8e0e 1433 return addrconf_ifid_eui48(eui, dev);
1da177e4 1434 case ARPHRD_ARCNET:
073a8e0e 1435 return addrconf_ifid_arcnet(eui, dev);
1da177e4 1436 case ARPHRD_INFINIBAND:
073a8e0e 1437 return addrconf_ifid_infiniband(eui, dev);
1da177e4
LT		 1438 }
1439 return -1;
1440}
1441
1442static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1443{
1444 int err = -1;
1445 struct inet6_ifaddr *ifp;
1446
1447 read_lock_bh(&idev->lock);
1448 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1449 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1450 memcpy(eui, ifp->addr.s6_addr+8, 8);
1451 err = 0;
1452 break;
1453 }
1454 }
1455 read_unlock_bh(&idev->lock);
1456 return err;
1457}
1458
1459#ifdef CONFIG_IPV6_PRIVACY
1460/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1461static int __ipv6_regen_rndid(struct inet6_dev *idev)
1462{
1da177e4 1463regen:
955189ef 1464 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1da177e4 1465 idev->rndid[0] &= ~0x02;
1da177e4
LT		 1466
1467 /*
1468 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1469 * check if generated address is not inappropriate
1470 *
1471 * - Reserved subnet anycast (RFC 2526)
1472 * 11111101 11....11 1xxxxxxx
1473 * - ISATAP (draft-ietf-ngtrans-isatap-13.txt) 5.1
1474 * 00-00-5E-FE-xx-xx-xx-xx
1475 * - value 0
1476 * - XXX: already assigned to an address on the device
1477 */
1ab1457c 1478 if (idev->rndid[0] == 0xfd &&
1da177e4
LT		 1479 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1480 (idev->rndid[7]&0x80))
1481 goto regen;
1482 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1483 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1484 goto regen;
1485 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1486 goto regen;
1487 }
1488
1489 return 0;
1490}
1491
1492static void ipv6_regen_rndid(unsigned long data)
1493{
1494 struct inet6_dev *idev = (struct inet6_dev *) data;
1495 unsigned long expires;
1496
8814c4b5 1497 rcu_read_lock_bh();
1da177e4
LT		 1498 write_lock_bh(&idev->lock);
1499
1500 if (idev->dead)
1501 goto out;
1502
1503 if (__ipv6_regen_rndid(idev) < 0)
1504 goto out;
1ab1457c 1505
1da177e4 1506 expires = jiffies +
1ab1457c 1507 idev->cnf.temp_prefered_lft * HZ -
1da177e4
LT		 1508 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1509 if (time_before(expires, jiffies)) {
1510 printk(KERN_WARNING
1511 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1512 idev->dev->name);
1513 goto out;
1514 }
1515
1516 if (!mod_timer(&idev->regen_timer, expires))
1517 in6_dev_hold(idev);
1518
1519out:
1520 write_unlock_bh(&idev->lock);
8814c4b5 1521 rcu_read_unlock_bh();
1da177e4
LT		 1522 in6_dev_put(idev);
1523}
1524
1525static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1526 int ret = 0;
1527
1528 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1529 ret = __ipv6_regen_rndid(idev);
1530 return ret;
1531}
1532#endif
1533
1534/*
1535 * Add prefix route.
1536 */
1537
1538static void
1539addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
e431b8c0 1540 unsigned long expires, u32 flags)
1da177e4 1541{
86872cb5
TG		 1542 struct fib6_config cfg = {
1543 .fc_table = RT6_TABLE_PREFIX,
1544 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1545 .fc_ifindex = dev->ifindex,
1546 .fc_expires = expires,
1547 .fc_dst_len = plen,
1548 .fc_flags = RTF_UP | flags,
1549 };
1da177e4 1550
86872cb5 1551 ipv6_addr_copy(&cfg.fc_dst, pfx);
1da177e4
LT		 1552
1553 /* Prevent useless cloning on PtP SIT.
1554 This thing is done here expecting that the whole
1555 class of non-broadcast devices need not cloning.
1556 */
0be669bb 1557#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
86872cb5
TG		 1558 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1559 cfg.fc_flags |= RTF_NONEXTHOP;
0be669bb 1560#endif
1da177e4 1561
86872cb5 1562 ip6_route_add(&cfg);
1da177e4
LT		 1563}
1564
1565/* Create "default" multicast route to the interface */
1566
1567static void addrconf_add_mroute(struct net_device *dev)
1568{
86872cb5
TG		 1569 struct fib6_config cfg = {
1570 .fc_table = RT6_TABLE_LOCAL,
1571 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1572 .fc_ifindex = dev->ifindex,
1573 .fc_dst_len = 8,
1574 .fc_flags = RTF_UP,
1575 };
1576
1577 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1578
1579 ip6_route_add(&cfg);
1da177e4
LT		 1580}
1581
0be669bb 1582#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 1583static void sit_route_add(struct net_device *dev)
1584{
86872cb5
TG		 1585 struct fib6_config cfg = {
1586 .fc_table = RT6_TABLE_MAIN,
1587 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1588 .fc_ifindex = dev->ifindex,
1589 .fc_dst_len = 96,
1590 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1591 };
1da177e4
LT		 1592
1593 /* prefix length - 96 bits "::d.d.d.d" */
86872cb5 1594 ip6_route_add(&cfg);
1da177e4 1595}
0be669bb 1596#endif
1da177e4
LT		 1597
1598static void addrconf_add_lroute(struct net_device *dev)
1599{
1600 struct in6_addr addr;
1601
1602 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1603 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1604}
1605
1606static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1607{
1608 struct inet6_dev *idev;
1609
1610 ASSERT_RTNL();
1611
1612 if ((idev = ipv6_find_idev(dev)) == NULL)
1613 return NULL;
1614
1615 /* Add default multicast route */
1616 addrconf_add_mroute(dev);
1617
1618 /* Add link local route */
1619 addrconf_add_lroute(dev);
1620 return idev;
1621}
1622
1623void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1624{
1625 struct prefix_info *pinfo;
1626 __u32 valid_lft;
1627 __u32 prefered_lft;
1628 int addr_type;
1629 unsigned long rt_expires;
1630 struct inet6_dev *in6_dev;
1631
1632 pinfo = (struct prefix_info *) opt;
1ab1457c 1633
1da177e4
LT		 1634 if (len < sizeof(struct prefix_info)) {
1635 ADBG(("addrconf: prefix option too short\n"));
1636 return;
1637 }
1ab1457c 1638
1da177e4
LT		 1639 /*
1640 * Validation checks ([ADDRCONF], page 19)
1641 */
1642
1643 addr_type = ipv6_addr_type(&pinfo->prefix);
1644
1645 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1646 return;
1647
1648 valid_lft = ntohl(pinfo->valid);
1649 prefered_lft = ntohl(pinfo->prefered);
1650
1651 if (prefered_lft > valid_lft) {
1652 if (net_ratelimit())
1653 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1654 return;
1655 }
1656
1657 in6_dev = in6_dev_get(dev);
1658
1659 if (in6_dev == NULL) {
1660 if (net_ratelimit())
1661 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1662 return;
1663 }
1664
1665 /*
1666 * Two things going on here:
1667 * 1) Add routes for on-link prefixes
1668 * 2) Configure prefixes with the auto flag set
1669 */
1670
1671 /* Avoid arithmetic overflow. Really, we could
1672 save rt_expires in seconds, likely valid_lft,
1673 but it would require division in fib gc, that it
1674 not good.
1675 */
1676 if (valid_lft >= 0x7FFFFFFF/HZ)
3dd4bc68 1677 rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ);
1da177e4 1678 else
3dd4bc68
YH		 1679 rt_expires = valid_lft * HZ;
1680
1681 /*
1682 * We convert this (in jiffies) to clock_t later.
1683 * Avoid arithmetic overflow there as well.
1684 * Overflow can happen only if HZ < USER_HZ.
1685 */
1686 if (HZ < USER_HZ && rt_expires > 0x7FFFFFFF / USER_HZ)
1687 rt_expires = 0x7FFFFFFF / USER_HZ;
1da177e4
LT		 1688
1689 if (pinfo->onlink) {
1690 struct rt6_info *rt;
1691 rt = rt6_lookup(&pinfo->prefix, NULL, dev->ifindex, 1);
1692
1693 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
1694 if (rt->rt6i_flags&RTF_EXPIRES) {
1695 if (valid_lft == 0) {
e0a1ad73 1696 ip6_del_rt(rt);
1da177e4
LT		 1697 rt = NULL;
1698 } else {
3dd4bc68 1699 rt->rt6i_expires = jiffies + rt_expires;
1da177e4
LT		 1700 }
1701 }
1702 } else if (valid_lft) {
1703 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
3dd4bc68 1704 dev, jiffies_to_clock_t(rt_expires), RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT);
1da177e4
LT		 1705 }
1706 if (rt)
1707 dst_release(&rt->u.dst);
1708 }
1709
1710 /* Try to figure out our local address for this prefix */
1711
1712 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1713 struct inet6_ifaddr * ifp;
1714 struct in6_addr addr;
1715 int create = 0, update_lft = 0;
1716
1717 if (pinfo->prefix_len == 64) {
1718 memcpy(&addr, &pinfo->prefix, 8);
1719 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1720 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1721 in6_dev_put(in6_dev);
1722 return;
1723 }
1724 goto ok;
1725 }
1726 if (net_ratelimit())
1727 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1728 pinfo->prefix_len);
1729 in6_dev_put(in6_dev);
1730 return;
1731
1732ok:
1733
1734 ifp = ipv6_get_ifaddr(&addr, dev, 1);
1735
1736 if (ifp == NULL && valid_lft) {
1737 int max_addresses = in6_dev->cnf.max_addresses;
95c385b4
NH		 1738 u32 addr_flags = 0;
1739
1740#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1741 if (in6_dev->cnf.optimistic_dad &&
1742 !ipv6_devconf.forwarding)
1743 addr_flags = IFA_F_OPTIMISTIC;
1744#endif
1da177e4
LT		 1745
1746 /* Do not allow to create too much of autoconfigured
1747 * addresses; this would be too easy way to crash kernel.
1748 */
1749 if (!max_addresses ||
1750 ipv6_count_addresses(in6_dev) < max_addresses)
1751 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
95c385b4
NH		 1752 addr_type&IPV6_ADDR_SCOPE_MASK,
1753 addr_flags);
1da177e4
LT		 1754
1755 if (!ifp || IS_ERR(ifp)) {
1756 in6_dev_put(in6_dev);
1757 return;
1758 }
1759
1760 update_lft = create = 1;
1761 ifp->cstamp = jiffies;
1762 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1763 }
1764
1765 if (ifp) {
1766 int flags;
1767 unsigned long now;
1768#ifdef CONFIG_IPV6_PRIVACY
1769 struct inet6_ifaddr *ift;
1770#endif
1771 u32 stored_lft;
1772
1773 /* update lifetime (RFC2462 5.5.3 e) */
1774 spin_lock(&ifp->lock);
1775 now = jiffies;
1776 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1777 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1778 else
1779 stored_lft = 0;
1780 if (!update_lft && stored_lft) {
1781 if (valid_lft > MIN_VALID_LIFETIME ||
1782 valid_lft > stored_lft)
1783 update_lft = 1;
1784 else if (stored_lft <= MIN_VALID_LIFETIME) {
1785 /* valid_lft <= stored_lft is always true */
1786 /* XXX: IPsec */
1787 update_lft = 0;
1788 } else {
1789 valid_lft = MIN_VALID_LIFETIME;
1790 if (valid_lft < prefered_lft)
1791 prefered_lft = valid_lft;
1792 update_lft = 1;
1793 }
1794 }
1795
1796 if (update_lft) {
1797 ifp->valid_lft = valid_lft;
1798 ifp->prefered_lft = prefered_lft;
1799 ifp->tstamp = now;
1800 flags = ifp->flags;
1801 ifp->flags &= ~IFA_F_DEPRECATED;
1802 spin_unlock(&ifp->lock);
1803
1804 if (!(flags&IFA_F_TENTATIVE))
1805 ipv6_ifa_notify(0, ifp);
1806 } else
1807 spin_unlock(&ifp->lock);
1808
1809#ifdef CONFIG_IPV6_PRIVACY
1810 read_lock_bh(&in6_dev->lock);
1811 /* update all temporary addresses in the list */
1812 for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1813 /*
1814 * When adjusting the lifetimes of an existing
1815 * temporary address, only lower the lifetimes.
1816 * Implementations must not increase the
1817 * lifetimes of an existing temporary address
1818 * when processing a Prefix Information Option.
1819 */
1820 spin_lock(&ift->lock);
1821 flags = ift->flags;
1822 if (ift->valid_lft > valid_lft &&
1823 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1824 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1825 if (ift->prefered_lft > prefered_lft &&
1826 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1827 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1828 spin_unlock(&ift->lock);
1829 if (!(flags&IFA_F_TENTATIVE))
1830 ipv6_ifa_notify(0, ift);
1831 }
1832
1833 if (create && in6_dev->cnf.use_tempaddr > 0) {
1834 /*
1835 * When a new public address is created as described in [ADDRCONF],
1836 * also create a new temporary address.
1837 */
1ab1457c 1838 read_unlock_bh(&in6_dev->lock);
1da177e4
LT		 1839 ipv6_create_tempaddr(ifp, NULL);
1840 } else {
1841 read_unlock_bh(&in6_dev->lock);
1842 }
1843#endif
1844 in6_ifa_put(ifp);
1845 addrconf_verify(0);
1846 }
1847 }
1848 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
1849 in6_dev_put(in6_dev);
1850}
1851
1852/*
1853 * Set destination address.
1854 * Special case for SIT interfaces where we create a new "virtual"
1855 * device.
1856 */
1857int addrconf_set_dstaddr(void __user *arg)
1858{
1859 struct in6_ifreq ireq;
1860 struct net_device *dev;
1861 int err = -EINVAL;
1862
1863 rtnl_lock();
1864
1865 err = -EFAULT;
1866 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1867 goto err_exit;
1868
881d966b 1869 dev = __dev_get_by_index(&init_net, ireq.ifr6_ifindex);
1da177e4
LT		 1870
1871 err = -ENODEV;
1872 if (dev == NULL)
1873 goto err_exit;
1874
0be669bb 1875#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 1876 if (dev->type == ARPHRD_SIT) {
1877 struct ifreq ifr;
1878 mm_segment_t oldfs;
1879 struct ip_tunnel_parm p;
1880
1881 err = -EADDRNOTAVAIL;
1882 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
1883 goto err_exit;
1884
1885 memset(&p, 0, sizeof(p));
1886 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
1887 p.iph.saddr = 0;
1888 p.iph.version = 4;
1889 p.iph.ihl = 5;
1890 p.iph.protocol = IPPROTO_IPV6;
1891 p.iph.ttl = 64;
1892 ifr.ifr_ifru.ifru_data = (void __user *)&p;
1893
1894 oldfs = get_fs(); set_fs(KERNEL_DS);
1895 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
1896 set_fs(oldfs);
1897
1898 if (err == 0) {
1899 err = -ENOBUFS;
881d966b 1900 if ((dev = __dev_get_by_name(&init_net, p.name)) == NULL)
1da177e4
LT		 1901 goto err_exit;
1902 err = dev_open(dev);
1903 }
1904 }
0be669bb 1905#endif
1da177e4
LT		 1906
1907err_exit:
1908 rtnl_unlock();
1909 return err;
1910}
1911
1912/*
1913 * Manual configuration of address on an interface
1914 */
0778769d 1915static int inet6_addr_add(int ifindex, struct in6_addr *pfx, int plen,
55ebaef1 1916 __u8 ifa_flags, __u32 prefered_lft, __u32 valid_lft)
1da177e4
LT		 1917{
1918 struct inet6_ifaddr *ifp;
1919 struct inet6_dev *idev;
1920 struct net_device *dev;
1921 int scope;
46d48046 1922 u32 flags = RTF_EXPIRES;
1da177e4
LT		 1923
1924 ASSERT_RTNL();
1ab1457c 1925
0778769d
NT		 1926 /* check the lifetime */
1927 if (!valid_lft || prefered_lft > valid_lft)
1928 return -EINVAL;
1929
881d966b 1930 if ((dev = __dev_get_by_index(&init_net, ifindex)) == NULL)
1da177e4 1931 return -ENODEV;
1ab1457c 1932
1da177e4
LT		 1933 if ((idev = addrconf_add_dev(dev)) == NULL)
1934 return -ENOBUFS;
1935
1936 scope = ipv6_addr_scope(pfx);
1937
46d48046 1938 if (valid_lft == INFINITY_LIFE_TIME) {
0778769d 1939 ifa_flags |= IFA_F_PERMANENT;
46d48046
YH		 1940 flags = 0;
1941 } else if (valid_lft >= 0x7FFFFFFF/HZ)
0778769d
NT		 1942 valid_lft = 0x7FFFFFFF/HZ;
1943
1944 if (prefered_lft == 0)
1945 ifa_flags |= IFA_F_DEPRECATED;
1946 else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
1947 (prefered_lft != INFINITY_LIFE_TIME))
1948 prefered_lft = 0x7FFFFFFF/HZ;
1949
1950 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
1951
1da177e4 1952 if (!IS_ERR(ifp)) {
06aebfb7 1953 spin_lock_bh(&ifp->lock);
0778769d
NT		 1954 ifp->valid_lft = valid_lft;
1955 ifp->prefered_lft = prefered_lft;
1956 ifp->tstamp = jiffies;
06aebfb7 1957 spin_unlock_bh(&ifp->lock);
0778769d 1958
46d48046
YH		 1959 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
1960 jiffies_to_clock_t(valid_lft * HZ), flags);
95c385b4
NH		 1961 /*
1962 * Note that section 3.1 of RFC 4429 indicates
1963 * that the Optimistic flag should not be set for
1964 * manually configured addresses
1965 */
1da177e4
LT		 1966 addrconf_dad_start(ifp, 0);
1967 in6_ifa_put(ifp);
0778769d 1968 addrconf_verify(0);
1da177e4
LT		 1969 return 0;
1970 }
1971
1972 return PTR_ERR(ifp);
1973}
1974
1975static int inet6_addr_del(int ifindex, struct in6_addr *pfx, int plen)
1976{
1977 struct inet6_ifaddr *ifp;
1978 struct inet6_dev *idev;
1979 struct net_device *dev;
1ab1457c 1980
881d966b 1981 if ((dev = __dev_get_by_index(&init_net, ifindex)) == NULL)
1da177e4
LT		 1982 return -ENODEV;
1983
1984 if ((idev = __in6_dev_get(dev)) == NULL)
1985 return -ENXIO;
1986
1987 read_lock_bh(&idev->lock);
1988 for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
1989 if (ifp->prefix_len == plen &&
1990 ipv6_addr_equal(pfx, &ifp->addr)) {
1991 in6_ifa_hold(ifp);
1992 read_unlock_bh(&idev->lock);
1ab1457c 1993
1da177e4
LT		 1994 ipv6_del_addr(ifp);
1995
1996 /* If the last address is deleted administratively,
1997 disable IPv6 on this interface.
1998 */
1999 if (idev->addr_list == NULL)
2000 addrconf_ifdown(idev->dev, 1);
2001 return 0;
2002 }
2003 }
2004 read_unlock_bh(&idev->lock);
2005 return -EADDRNOTAVAIL;
2006}
2007
2008
2009int addrconf_add_ifaddr(void __user *arg)
2010{
2011 struct in6_ifreq ireq;
2012 int err;
1ab1457c 2013
1da177e4
LT		 2014 if (!capable(CAP_NET_ADMIN))
2015 return -EPERM;
1ab1457c 2016
1da177e4
LT		 2017 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2018 return -EFAULT;
2019
2020 rtnl_lock();
0778769d 2021 err = inet6_addr_add(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen,
55ebaef1 2022 IFA_F_PERMANENT, INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4
LT		 2023 rtnl_unlock();
2024 return err;
2025}
2026
2027int addrconf_del_ifaddr(void __user *arg)
2028{
2029 struct in6_ifreq ireq;
2030 int err;
1ab1457c 2031
1da177e4
LT		 2032 if (!capable(CAP_NET_ADMIN))
2033 return -EPERM;
2034
2035 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2036 return -EFAULT;
2037
2038 rtnl_lock();
2039 err = inet6_addr_del(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
2040 rtnl_unlock();
2041 return err;
2042}
2043
0be669bb 2044#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2045static void sit_add_v4_addrs(struct inet6_dev *idev)
2046{
2047 struct inet6_ifaddr * ifp;
2048 struct in6_addr addr;
2049 struct net_device *dev;
2050 int scope;
2051
2052 ASSERT_RTNL();
2053
2054 memset(&addr, 0, sizeof(struct in6_addr));
2055 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2056
2057 if (idev->dev->flags&IFF_POINTOPOINT) {
2058 addr.s6_addr32[0] = htonl(0xfe800000);
2059 scope = IFA_LINK;
2060 } else {
2061 scope = IPV6_ADDR_COMPATv4;
2062 }
2063
2064 if (addr.s6_addr32[3]) {
2065 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
2066 if (!IS_ERR(ifp)) {
2067 spin_lock_bh(&ifp->lock);
2068 ifp->flags &= ~IFA_F_TENTATIVE;
2069 spin_unlock_bh(&ifp->lock);
2070 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2071 in6_ifa_put(ifp);
2072 }
2073 return;
2074 }
2075
881d966b 2076 for_each_netdev(&init_net, dev) {
e5ed6399 2077 struct in_device * in_dev = __in_dev_get_rtnl(dev);
1da177e4
LT		 2078 if (in_dev && (dev->flags & IFF_UP)) {
2079 struct in_ifaddr * ifa;
2080
2081 int flag = scope;
2082
2083 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2084 int plen;
2085
2086 addr.s6_addr32[3] = ifa->ifa_local;
2087
2088 if (ifa->ifa_scope == RT_SCOPE_LINK)
2089 continue;
2090 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2091 if (idev->dev->flags&IFF_POINTOPOINT)
2092 continue;
2093 flag |= IFA_HOST;
2094 }
2095 if (idev->dev->flags&IFF_POINTOPOINT)
2096 plen = 64;
2097 else
2098 plen = 96;
2099
2100 ifp = ipv6_add_addr(idev, &addr, plen, flag,
2101 IFA_F_PERMANENT);
2102 if (!IS_ERR(ifp)) {
2103 spin_lock_bh(&ifp->lock);
2104 ifp->flags &= ~IFA_F_TENTATIVE;
2105 spin_unlock_bh(&ifp->lock);
2106 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2107 in6_ifa_put(ifp);
2108 }
2109 }
2110 }
1ab1457c 2111 }
1da177e4 2112}
0be669bb 2113#endif
1da177e4
LT		 2114
2115static void init_loopback(struct net_device *dev)
2116{
2117 struct inet6_dev *idev;
2118 struct inet6_ifaddr * ifp;
2119
2120 /* ::1 */
2121
2122 ASSERT_RTNL();
2123
2124 if ((idev = ipv6_find_idev(dev)) == NULL) {
2125 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2126 return;
2127 }
2128
2129 ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
2130 if (!IS_ERR(ifp)) {
2131 spin_lock_bh(&ifp->lock);
2132 ifp->flags &= ~IFA_F_TENTATIVE;
2133 spin_unlock_bh(&ifp->lock);
2134 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2135 in6_ifa_put(ifp);
2136 }
2137}
2138
2139static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2140{
2141 struct inet6_ifaddr * ifp;
95c385b4
NH		 2142 u32 addr_flags = IFA_F_PERMANENT;
2143
2144#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2145 if (idev->cnf.optimistic_dad &&
2146 !ipv6_devconf.forwarding)
2147 addr_flags |= IFA_F_OPTIMISTIC;
2148#endif
1da177e4 2149
95c385b4
NH		 2150
2151 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
1da177e4 2152 if (!IS_ERR(ifp)) {
46d48046 2153 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
1da177e4
LT		 2154 addrconf_dad_start(ifp, 0);
2155 in6_ifa_put(ifp);
2156 }
2157}
2158
2159static void addrconf_dev_config(struct net_device *dev)
2160{
2161 struct in6_addr addr;
2162 struct inet6_dev * idev;
2163
2164 ASSERT_RTNL();
2165
74235a25
HX		 2166 if ((dev->type != ARPHRD_ETHER) &&
2167 (dev->type != ARPHRD_FDDI) &&
2168 (dev->type != ARPHRD_IEEE802_TR) &&
2169 (dev->type != ARPHRD_ARCNET) &&
2170 (dev->type != ARPHRD_INFINIBAND)) {
2171 /* Alas, we support only Ethernet autoconfiguration. */
2172 return;
2173 }
2174
1da177e4
LT		 2175 idev = addrconf_add_dev(dev);
2176 if (idev == NULL)
2177 return;
2178
2179 memset(&addr, 0, sizeof(struct in6_addr));
2180 addr.s6_addr32[0] = htonl(0xFE800000);
2181
2182 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2183 addrconf_add_linklocal(idev, &addr);
2184}
2185
0be669bb 2186#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2187static void addrconf_sit_config(struct net_device *dev)
2188{
2189 struct inet6_dev *idev;
2190
2191 ASSERT_RTNL();
2192
1ab1457c
YH		 2193 /*
2194 * Configure the tunnel with one of our IPv4
2195 * addresses... we should configure all of
1da177e4
LT		 2196 * our v4 addrs in the tunnel
2197 */
2198
2199 if ((idev = ipv6_find_idev(dev)) == NULL) {
2200 printk(KERN_DEBUG "init sit: add_dev failed\n");
2201 return;
2202 }
2203
2204 sit_add_v4_addrs(idev);
2205
2206 if (dev->flags&IFF_POINTOPOINT) {
2207 addrconf_add_mroute(dev);
2208 addrconf_add_lroute(dev);
2209 } else
2210 sit_route_add(dev);
2211}
0be669bb 2212#endif
1da177e4
LT		 2213
2214static inline int
2215ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2216{
2217 struct in6_addr lladdr;
2218
95c385b4 2219 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
1da177e4
LT		 2220 addrconf_add_linklocal(idev, &lladdr);
2221 return 0;
2222 }
2223 return -1;
2224}
2225
2226static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2227{
2228 struct net_device *link_dev;
2229
2230 /* first try to inherit the link-local address from the link device */
2231 if (idev->dev->iflink &&
881d966b 2232 (link_dev = __dev_get_by_index(&init_net, idev->dev->iflink))) {
1da177e4
LT		 2233 if (!ipv6_inherit_linklocal(idev, link_dev))
2234 return;
2235 }
2236 /* then try to inherit it from any device */
881d966b 2237 for_each_netdev(&init_net, link_dev) {
1da177e4
LT		 2238 if (!ipv6_inherit_linklocal(idev, link_dev))
2239 return;
2240 }
2241 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2242}
2243
2244/*
2245 * Autoconfigure tunnel with a link-local address so routing protocols,
2246 * DHCPv6, MLD etc. can be run over the virtual link
2247 */
2248
2249static void addrconf_ip6_tnl_config(struct net_device *dev)
2250{
2251 struct inet6_dev *idev;
2252
2253 ASSERT_RTNL();
2254
2255 if ((idev = addrconf_add_dev(dev)) == NULL) {
2256 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2257 return;
2258 }
2259 ip6_tnl_add_linklocal(idev);
1da177e4
LT		 2260}
2261
1ab1457c 2262static int addrconf_notify(struct notifier_block *this, unsigned long event,
1da177e4
LT		 2263 void * data)
2264{
2265 struct net_device *dev = (struct net_device *) data;
74235a25 2266 struct inet6_dev *idev = __in6_dev_get(dev);
c5e33bdd 2267 int run_pending = 0;
b217d616 2268 int err;
1da177e4 2269
e9dc8653
EB		 2270 if (dev->nd_net != &init_net)
2271 return NOTIFY_DONE;
2272
1da177e4 2273 switch(event) {
45ba9dd2 2274 case NETDEV_REGISTER:
74235a25 2275 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
45ba9dd2
YH		 2276 idev = ipv6_add_dev(dev);
2277 if (!idev)
b217d616 2278 return notifier_from_errno(-ENOMEM);
45ba9dd2
YH		 2279 }
2280 break;
1da177e4 2281 case NETDEV_UP:
3c21edbd 2282 case NETDEV_CHANGE:
c2edacf8
JV		 2283 if (dev->flags & IFF_SLAVE)
2284 break;
2285
3c21edbd 2286 if (event == NETDEV_UP) {
f24e3d65 2287 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 2288 /* device is not ready yet. */
2289 printk(KERN_INFO
2290 "ADDRCONF(NETDEV_UP): %s: "
2291 "link is not ready\n",
2292 dev->name);
2293 break;
2294 }
99081049
KS		 2295
2296 if (idev)
2297 idev->if_flags |= IF_READY;
3c21edbd 2298 } else {
f24e3d65 2299 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 2300 /* device is still not ready. */
2301 break;
2302 }
2303
2304 if (idev) {
2305 if (idev->if_flags & IF_READY) {
2306 /* device is already configured. */
2307 break;
2308 }
2309 idev->if_flags |= IF_READY;
2310 }
2311
2312 printk(KERN_INFO
2313 "ADDRCONF(NETDEV_CHANGE): %s: "
2314 "link becomes ready\n",
2315 dev->name);
2316
c5e33bdd 2317 run_pending = 1;
3c21edbd
YH		 2318 }
2319
1da177e4 2320 switch(dev->type) {
0be669bb 2321#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2322 case ARPHRD_SIT:
2323 addrconf_sit_config(dev);
2324 break;
0be669bb 2325#endif
1da177e4
LT		 2326 case ARPHRD_TUNNEL6:
2327 addrconf_ip6_tnl_config(dev);
2328 break;
2329 case ARPHRD_LOOPBACK:
2330 init_loopback(dev);
2331 break;
2332
2333 default:
2334 addrconf_dev_config(dev);
2335 break;
3ff50b79 2336 }
1da177e4 2337 if (idev) {
c5e33bdd
YH		 2338 if (run_pending)
2339 addrconf_dad_run(idev);
2340
1da177e4
LT		 2341 /* If the MTU changed during the interface down, when the
2342 interface up, the changed MTU must be reflected in the
2343 idev as well as routers.
2344 */
2345 if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2346 rt6_mtu_change(dev, dev->mtu);
2347 idev->cnf.mtu6 = dev->mtu;
2348 }
2349 idev->tstamp = jiffies;
2350 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2351 /* If the changed mtu during down is lower than IPV6_MIN_MTU
2352 stop IPv6 on this interface.
2353 */
2354 if (dev->mtu < IPV6_MIN_MTU)
2355 addrconf_ifdown(dev, event != NETDEV_DOWN);
2356 }
2357 break;
2358
2359 case NETDEV_CHANGEMTU:
2360 if ( idev && dev->mtu >= IPV6_MIN_MTU) {
2361 rt6_mtu_change(dev, dev->mtu);
2362 idev->cnf.mtu6 = dev->mtu;
2363 break;
2364 }
2365
2366 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2367
2368 case NETDEV_DOWN:
2369 case NETDEV_UNREGISTER:
2370 /*
2371 * Remove all addresses from this interface.
2372 */
2373 addrconf_ifdown(dev, event != NETDEV_DOWN);
2374 break;
3c21edbd 2375
1da177e4 2376 case NETDEV_CHANGENAME:
1da177e4 2377 if (idev) {
5632c515
SH		 2378 snmp6_unregister_dev(idev);
2379#ifdef CONFIG_SYSCTL
1da177e4
LT		 2380 addrconf_sysctl_unregister(&idev->cnf);
2381 neigh_sysctl_unregister(idev->nd_parms);
2382 neigh_sysctl_register(dev, idev->nd_parms,
2383 NET_IPV6, NET_IPV6_NEIGH, "ipv6",
2384 &ndisc_ifinfo_sysctl_change,
2385 NULL);
2386 addrconf_sysctl_register(idev, &idev->cnf);
1da177e4 2387#endif
b217d616
HX		 2388 err = snmp6_register_dev(idev);
2389 if (err)
2390 return notifier_from_errno(err);
5632c515 2391 }
1da177e4 2392 break;
3ff50b79 2393 }
1da177e4
LT		 2394
2395 return NOTIFY_OK;
2396}
2397
2398/*
2399 * addrconf module should be notified of a device going up
2400 */
2401static struct notifier_block ipv6_dev_notf = {
2402 .notifier_call = addrconf_notify,
2403 .priority = 0
2404};
2405
2406static int addrconf_ifdown(struct net_device *dev, int how)
2407{
2408 struct inet6_dev *idev;
2409 struct inet6_ifaddr *ifa, **bifa;
2410 int i;
2411
2412 ASSERT_RTNL();
2413
2774c7ab 2414 if (dev == init_net.loopback_dev && how == 1)
1da177e4
LT		 2415 how = 0;
2416
2417 rt6_ifdown(dev);
2418 neigh_ifdown(&nd_tbl, dev);
2419
2420 idev = __in6_dev_get(dev);
2421 if (idev == NULL)
2422 return -ENODEV;
2423
2424 /* Step 1: remove reference to ipv6 device from parent device.
1ab1457c 2425 Do not dev_put!
1da177e4
LT		 2426 */
2427 if (how == 1) {
1da177e4 2428 idev->dead = 1;
8814c4b5
YH		 2429
2430 /* protected by rtnl_lock */
2431 rcu_assign_pointer(dev->ip6_ptr, NULL);
1da177e4
LT		 2432
2433 /* Step 1.5: remove snmp6 entry */
2434 snmp6_unregister_dev(idev);
2435
2436 }
2437
2438 /* Step 2: clear hash table */
2439 for (i=0; i<IN6_ADDR_HSIZE; i++) {
2440 bifa = &inet6_addr_lst[i];
2441
2442 write_lock_bh(&addrconf_hash_lock);
2443 while ((ifa = *bifa) != NULL) {
2444 if (ifa->idev == idev) {
2445 *bifa = ifa->lst_next;
2446 ifa->lst_next = NULL;
2447 addrconf_del_timer(ifa);
2448 in6_ifa_put(ifa);
2449 continue;
2450 }
2451 bifa = &ifa->lst_next;
2452 }
2453 write_unlock_bh(&addrconf_hash_lock);
2454 }
2455
2456 write_lock_bh(&idev->lock);
2457
2458 /* Step 3: clear flags for stateless addrconf */
2459 if (how != 1)
3c21edbd 2460 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4
LT		 2461
2462 /* Step 4: clear address list */
2463#ifdef CONFIG_IPV6_PRIVACY
2464 if (how == 1 && del_timer(&idev->regen_timer))
2465 in6_dev_put(idev);
2466
2467 /* clear tempaddr list */
2468 while ((ifa = idev->tempaddr_list) != NULL) {
2469 idev->tempaddr_list = ifa->tmp_next;
2470 ifa->tmp_next = NULL;
2471 ifa->dead = 1;
2472 write_unlock_bh(&idev->lock);
2473 spin_lock_bh(&ifa->lock);
2474
2475 if (ifa->ifpub) {
2476 in6_ifa_put(ifa->ifpub);
2477 ifa->ifpub = NULL;
2478 }
2479 spin_unlock_bh(&ifa->lock);
2480 in6_ifa_put(ifa);
2481 write_lock_bh(&idev->lock);
2482 }
2483#endif
2484 while ((ifa = idev->addr_list) != NULL) {
2485 idev->addr_list = ifa->if_next;
2486 ifa->if_next = NULL;
2487 ifa->dead = 1;
2488 addrconf_del_timer(ifa);
2489 write_unlock_bh(&idev->lock);
2490
2491 __ipv6_ifa_notify(RTM_DELADDR, ifa);
063ed369 2492 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
1da177e4
LT		 2493 in6_ifa_put(ifa);
2494
2495 write_lock_bh(&idev->lock);
2496 }
2497 write_unlock_bh(&idev->lock);
2498
2499 /* Step 5: Discard multicast list */
2500
2501 if (how == 1)
2502 ipv6_mc_destroy_dev(idev);
2503 else
2504 ipv6_mc_down(idev);
2505
1da177e4 2506 idev->tstamp = jiffies;
1ab1457c 2507
1da177e4
LT		 2508 /* Shot the device (if unregistered) */
2509
2510 if (how == 1) {
2511#ifdef CONFIG_SYSCTL
2512 addrconf_sysctl_unregister(&idev->cnf);
2513 neigh_sysctl_unregister(idev->nd_parms);
2514#endif
2515 neigh_parms_release(&nd_tbl, idev->nd_parms);
2516 neigh_ifdown(&nd_tbl, dev);
2517 in6_dev_put(idev);
2518 }
2519 return 0;
2520}
2521
2522static void addrconf_rs_timer(unsigned long data)
2523{
2524 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2525
2526 if (ifp->idev->cnf.forwarding)
2527 goto out;
2528
2529 if (ifp->idev->if_flags & IF_RA_RCVD) {
2530 /*
2531 * Announcement received after solicitation
2532 * was sent
2533 */
2534 goto out;
2535 }
2536
2537 spin_lock(&ifp->lock);
2538 if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2539 struct in6_addr all_routers;
2540
2541 /* The wait after the last probe can be shorter */
2542 addrconf_mod_timer(ifp, AC_RS,
2543 (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2544 ifp->idev->cnf.rtr_solicit_delay :
2545 ifp->idev->cnf.rtr_solicit_interval);
2546 spin_unlock(&ifp->lock);
2547
2548 ipv6_addr_all_routers(&all_routers);
2549
2550 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2551 } else {
2552 spin_unlock(&ifp->lock);
2553 /*
2554 * Note: we do not support deprecated "all on-link"
2555 * assumption any longer.
2556 */
2557 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2558 ifp->idev->dev->name);
2559 }
2560
2561out:
2562 in6_ifa_put(ifp);
2563}
2564
2565/*
2566 * Duplicate Address Detection
2567 */
3c21edbd
YH		 2568static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2569{
2570 unsigned long rand_num;
2571 struct inet6_dev *idev = ifp->idev;
2572
95c385b4
NH		 2573 if (ifp->flags & IFA_F_OPTIMISTIC)
2574 rand_num = 0;
2575 else
2576 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2577
3c21edbd
YH		 2578 ifp->probes = idev->cnf.dad_transmits;
2579 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2580}
2581
e431b8c0 2582static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
1da177e4
LT		 2583{
2584 struct inet6_dev *idev = ifp->idev;
2585 struct net_device *dev = idev->dev;
1da177e4
LT		 2586
2587 addrconf_join_solict(dev, &ifp->addr);
2588
1da177e4 2589 net_srandom(ifp->addr.s6_addr32[3]);
1da177e4
LT		 2590
2591 read_lock_bh(&idev->lock);
2592 if (ifp->dead)
2593 goto out;
2594 spin_lock_bh(&ifp->lock);
2595
2596 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
55ebaef1
NT		 2597 !(ifp->flags&IFA_F_TENTATIVE) ||
2598 ifp->flags & IFA_F_NODAD) {
95c385b4 2599 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
1da177e4
LT		 2600 spin_unlock_bh(&ifp->lock);
2601 read_unlock_bh(&idev->lock);
2602
2603 addrconf_dad_completed(ifp);
2604 return;
2605 }
2606
6732bade 2607 if (!(idev->if_flags & IF_READY)) {
3dd3bf83 2608 spin_unlock_bh(&ifp->lock);
6732bade 2609 read_unlock_bh(&idev->lock);
3c21edbd
YH		 2610 /*
2611 * If the defice is not ready:
2612 * - keep it tentative if it is a permanent address.
2613 * - otherwise, kill it.
2614 */
2615 in6_ifa_hold(ifp);
2616 addrconf_dad_stop(ifp);
6732bade 2617 return;
3c21edbd 2618 }
95c385b4
NH		 2619
2620 /*
2621 * Optimistic nodes can start receiving
2622 * Frames right away
2623 */
2624 if(ifp->flags & IFA_F_OPTIMISTIC)
2625 ip6_ins_rt(ifp->rt);
2626
6732bade
YH		 2627 addrconf_dad_kick(ifp);
2628 spin_unlock_bh(&ifp->lock);
1da177e4
LT		 2629out:
2630 read_unlock_bh(&idev->lock);
2631}
2632
2633static void addrconf_dad_timer(unsigned long data)
2634{
2635 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2636 struct inet6_dev *idev = ifp->idev;
2637 struct in6_addr unspec;
2638 struct in6_addr mcaddr;
2639
2640 read_lock_bh(&idev->lock);
2641 if (idev->dead) {
2642 read_unlock_bh(&idev->lock);
2643 goto out;
2644 }
2645 spin_lock_bh(&ifp->lock);
2646 if (ifp->probes == 0) {
2647 /*
2648 * DAD was successful
2649 */
2650
95c385b4 2651 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
1da177e4
LT		 2652 spin_unlock_bh(&ifp->lock);
2653 read_unlock_bh(&idev->lock);
2654
2655 addrconf_dad_completed(ifp);
2656
2657 goto out;
2658 }
2659
2660 ifp->probes--;
2661 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2662 spin_unlock_bh(&ifp->lock);
2663 read_unlock_bh(&idev->lock);
2664
2665 /* send a neighbour solicitation for our addr */
2666 memset(&unspec, 0, sizeof(unspec));
2667 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2668 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec);
2669out:
2670 in6_ifa_put(ifp);
2671}
2672
2673static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2674{
2675 struct net_device * dev = ifp->idev->dev;
2676
2677 /*
2678 * Configure the address for reception. Now it is valid.
2679 */
2680
2681 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2682
2683 /* If added prefix is link local and forwarding is off,
2684 start sending router solicitations.
2685 */
2686
2687 if (ifp->idev->cnf.forwarding == 0 &&
2688 ifp->idev->cnf.rtr_solicits > 0 &&
2689 (dev->flags&IFF_LOOPBACK) == 0 &&
2690 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2691 struct in6_addr all_routers;
2692
2693 ipv6_addr_all_routers(&all_routers);
2694
2695 /*
2696 * If a host as already performed a random delay
2697 * [...] as part of DAD [...] there is no need
2698 * to delay again before sending the first RS
2699 */
2700 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2701
2702 spin_lock_bh(&ifp->lock);
2703 ifp->probes = 1;
2704 ifp->idev->if_flags |= IF_RS_SENT;
2705 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2706 spin_unlock_bh(&ifp->lock);
2707 }
2708}
2709
c5e33bdd
YH		 2710static void addrconf_dad_run(struct inet6_dev *idev) {
2711 struct inet6_ifaddr *ifp;
2712
2713 read_lock_bh(&idev->lock);
2714 for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2715 spin_lock_bh(&ifp->lock);
2716 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2717 spin_unlock_bh(&ifp->lock);
2718 continue;
2719 }
2720 spin_unlock_bh(&ifp->lock);
2721 addrconf_dad_kick(ifp);
2722 }
2723 read_unlock_bh(&idev->lock);
2724}
2725
1da177e4
LT		 2726#ifdef CONFIG_PROC_FS
2727struct if6_iter_state {
2728 int bucket;
2729};
2730
2731static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2732{
2733 struct inet6_ifaddr *ifa = NULL;
2734 struct if6_iter_state *state = seq->private;
2735
2736 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2737 ifa = inet6_addr_lst[state->bucket];
2738 if (ifa)
2739 break;
2740 }
2741 return ifa;
2742}
2743
2744static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2745{
2746 struct if6_iter_state *state = seq->private;
2747
2748 ifa = ifa->lst_next;
2749try_again:
2750 if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2751 ifa = inet6_addr_lst[state->bucket];
2752 goto try_again;
2753 }
2754 return ifa;
2755}
2756
2757static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2758{
2759 struct inet6_ifaddr *ifa = if6_get_first(seq);
2760
2761 if (ifa)
2762 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2763 --pos;
2764 return pos ? NULL : ifa;
2765}
2766
2767static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2768{
2769 read_lock_bh(&addrconf_hash_lock);
2770 return if6_get_idx(seq, *pos);
2771}
2772
2773static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2774{
2775 struct inet6_ifaddr *ifa;
2776
2777 ifa = if6_get_next(seq, v);
2778 ++*pos;
2779 return ifa;
2780}
2781
2782static void if6_seq_stop(struct seq_file *seq, void *v)
2783{
2784 read_unlock_bh(&addrconf_hash_lock);
2785}
2786
2787static int if6_seq_show(struct seq_file *seq, void *v)
2788{
2789 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2790 seq_printf(seq,
9343e79a 2791 NIP6_SEQFMT " %02x %02x %02x %02x %8s\n",
1da177e4
LT		 2792 NIP6(ifp->addr),
2793 ifp->idev->dev->ifindex,
2794 ifp->prefix_len,
2795 ifp->scope,
2796 ifp->flags,
2797 ifp->idev->dev->name);
2798 return 0;
2799}
2800
56b3d975 2801static const struct seq_operations if6_seq_ops = {
1da177e4
LT		 2802 .start = if6_seq_start,
2803 .next = if6_seq_next,
2804 .show = if6_seq_show,
2805 .stop = if6_seq_stop,
2806};
2807
2808static int if6_seq_open(struct inode *inode, struct file *file)
2809{
cf7732e4
PE		 2810 return seq_open_private(file, &if6_seq_ops,
2811 sizeof(struct if6_iter_state));
1da177e4
LT		 2812}
2813
9a32144e 2814static const struct file_operations if6_fops = {
1da177e4
LT		 2815 .owner = THIS_MODULE,
2816 .open = if6_seq_open,
2817 .read = seq_read,
2818 .llseek = seq_lseek,
2819 .release = seq_release_private,
2820};
2821
2822int __init if6_proc_init(void)
2823{
457c4cbc 2824 if (!proc_net_fops_create(&init_net, "if_inet6", S_IRUGO, &if6_fops))
1da177e4
LT		 2825 return -ENOMEM;
2826 return 0;
2827}
2828
2829void if6_proc_exit(void)
2830{
457c4cbc 2831 proc_net_remove(&init_net, "if_inet6");
1da177e4
LT		 2832}
2833#endif /* CONFIG_PROC_FS */
2834
59fbb3a6 2835#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3b9f9a1c
NT		 2836/* Check if address is a home address configured on any interface. */
2837int ipv6_chk_home_addr(struct in6_addr *addr)
2838{
2839 int ret = 0;
2840 struct inet6_ifaddr * ifp;
2841 u8 hash = ipv6_addr_hash(addr);
2842 read_lock_bh(&addrconf_hash_lock);
2843 for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) {
2844 if (ipv6_addr_cmp(&ifp->addr, addr) == 0 &&
2845 (ifp->flags & IFA_F_HOMEADDRESS)) {
2846 ret = 1;
2847 break;
2848 }
2849 }
2850 read_unlock_bh(&addrconf_hash_lock);
2851 return ret;
2852}
2853#endif
2854
1da177e4
LT		 2855/*
2856 * Periodic address status verification
2857 */
2858
2859static void addrconf_verify(unsigned long foo)
2860{
2861 struct inet6_ifaddr *ifp;
2862 unsigned long now, next;
2863 int i;
2864
2865 spin_lock_bh(&addrconf_verify_lock);
2866 now = jiffies;
2867 next = now + ADDR_CHECK_FREQUENCY;
2868
2869 del_timer(&addr_chk_timer);
2870
2871 for (i=0; i < IN6_ADDR_HSIZE; i++) {
2872
2873restart:
5d5780df 2874 read_lock(&addrconf_hash_lock);
1da177e4
LT		 2875 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
2876 unsigned long age;
2877#ifdef CONFIG_IPV6_PRIVACY
2878 unsigned long regen_advance;
2879#endif
2880
2881 if (ifp->flags & IFA_F_PERMANENT)
2882 continue;
2883
2884 spin_lock(&ifp->lock);
2885 age = (now - ifp->tstamp) / HZ;
2886
2887#ifdef CONFIG_IPV6_PRIVACY
1ab1457c
YH		 2888 regen_advance = ifp->idev->cnf.regen_max_retry *
2889 ifp->idev->cnf.dad_transmits *
1da177e4
LT		 2890 ifp->idev->nd_parms->retrans_time / HZ;
2891#endif
2892
8f27ebb9
YH		 2893 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
2894 age >= ifp->valid_lft) {
1da177e4
LT		 2895 spin_unlock(&ifp->lock);
2896 in6_ifa_hold(ifp);
5d5780df 2897 read_unlock(&addrconf_hash_lock);
1da177e4
LT		 2898 ipv6_del_addr(ifp);
2899 goto restart;
8f27ebb9
YH		 2900 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
2901 spin_unlock(&ifp->lock);
2902 continue;
1da177e4
LT		 2903 } else if (age >= ifp->prefered_lft) {
2904 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
2905 int deprecate = 0;
2906
2907 if (!(ifp->flags&IFA_F_DEPRECATED)) {
2908 deprecate = 1;
2909 ifp->flags |= IFA_F_DEPRECATED;
2910 }
2911
2912 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
2913 next = ifp->tstamp + ifp->valid_lft * HZ;
2914
2915 spin_unlock(&ifp->lock);
2916
2917 if (deprecate) {
2918 in6_ifa_hold(ifp);
5d5780df 2919 read_unlock(&addrconf_hash_lock);
1da177e4
LT		 2920
2921 ipv6_ifa_notify(0, ifp);
2922 in6_ifa_put(ifp);
2923 goto restart;
2924 }
2925#ifdef CONFIG_IPV6_PRIVACY
2926 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
2927 !(ifp->flags&IFA_F_TENTATIVE)) {
2928 if (age >= ifp->prefered_lft - regen_advance) {
2929 struct inet6_ifaddr *ifpub = ifp->ifpub;
2930 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2931 next = ifp->tstamp + ifp->prefered_lft * HZ;
2932 if (!ifp->regen_count && ifpub) {
2933 ifp->regen_count++;
2934 in6_ifa_hold(ifp);
2935 in6_ifa_hold(ifpub);
2936 spin_unlock(&ifp->lock);
5d5780df 2937 read_unlock(&addrconf_hash_lock);
291d809b
HY		 2938 spin_lock(&ifpub->lock);
2939 ifpub->regen_count = 0;
2940 spin_unlock(&ifpub->lock);
1da177e4
LT		 2941 ipv6_create_tempaddr(ifpub, ifp);
2942 in6_ifa_put(ifpub);
2943 in6_ifa_put(ifp);
2944 goto restart;
2945 }
2946 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
2947 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
2948 spin_unlock(&ifp->lock);
2949#endif
2950 } else {
2951 /* ifp->prefered_lft <= ifp->valid_lft */
2952 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2953 next = ifp->tstamp + ifp->prefered_lft * HZ;
2954 spin_unlock(&ifp->lock);
2955 }
2956 }
5d5780df 2957 read_unlock(&addrconf_hash_lock);
1da177e4
LT		 2958 }
2959
2960 addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
2961 add_timer(&addr_chk_timer);
2962 spin_unlock_bh(&addrconf_verify_lock);
2963}
2964
461d8837
TG		 2965static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
2966{
2967 struct in6_addr *pfx = NULL;
2968
2969 if (addr)
2970 pfx = nla_data(addr);
2971
2972 if (local) {
2973 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
2974 pfx = NULL;
2975 else
2976 pfx = nla_data(local);
2977 }
2978
2979 return pfx;
2980}
2981
ef7c79ed 2982static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
461d8837
TG		 2983 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
2984 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
2985 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
2986};
2987
1da177e4
LT		 2988static int
2989inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
2990{
b933f716
TG		 2991 struct ifaddrmsg *ifm;
2992 struct nlattr *tb[IFA_MAX+1];
1da177e4 2993 struct in6_addr *pfx;
b933f716 2994 int err;
1da177e4 2995
b933f716
TG		 2996 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
2997 if (err < 0)
2998 return err;
2999
3000 ifm = nlmsg_data(nlh);
3001 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
1da177e4
LT		 3002 if (pfx == NULL)
3003 return -EINVAL;
3004
3005 return inet6_addr_del(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3006}
3007
55ebaef1
NT		 3008static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3009 u32 prefered_lft, u32 valid_lft)
081bba5b 3010{
46d48046
YH		 3011 u32 flags = RTF_EXPIRES;
3012
081bba5b
NT		 3013 if (!valid_lft || (prefered_lft > valid_lft))
3014 return -EINVAL;
3015
46d48046 3016 if (valid_lft == INFINITY_LIFE_TIME) {
55ebaef1 3017 ifa_flags |= IFA_F_PERMANENT;
46d48046
YH		 3018 flags = 0;
3019 } else if (valid_lft >= 0x7FFFFFFF/HZ)
081bba5b
NT		 3020 valid_lft = 0x7FFFFFFF/HZ;
3021
3022 if (prefered_lft == 0)
55ebaef1 3023 ifa_flags |= IFA_F_DEPRECATED;
081bba5b
NT		 3024 else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
3025 (prefered_lft != INFINITY_LIFE_TIME))
3026 prefered_lft = 0x7FFFFFFF/HZ;
3027
3028 spin_lock_bh(&ifp->lock);
3b9f9a1c 3029 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
081bba5b
NT		 3030 ifp->tstamp = jiffies;
3031 ifp->valid_lft = valid_lft;
3032 ifp->prefered_lft = prefered_lft;
3033
3034 spin_unlock_bh(&ifp->lock);
3035 if (!(ifp->flags&IFA_F_TENTATIVE))
3036 ipv6_ifa_notify(0, ifp);
081bba5b 3037
46d48046
YH		 3038 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3039 jiffies_to_clock_t(valid_lft * HZ), flags);
081bba5b
NT		 3040 addrconf_verify(0);
3041
3042 return 0;
3043}
3044
1da177e4
LT		 3045static int
3046inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3047{
461d8837
TG		 3048 struct ifaddrmsg *ifm;
3049 struct nlattr *tb[IFA_MAX+1];
1da177e4 3050 struct in6_addr *pfx;
7198f8ce
TG		 3051 struct inet6_ifaddr *ifa;
3052 struct net_device *dev;
55ebaef1
NT		 3053 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3054 u8 ifa_flags;
461d8837 3055 int err;
1da177e4 3056
461d8837
TG		 3057 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3058 if (err < 0)
3059 return err;
3060
3061 ifm = nlmsg_data(nlh);
3062 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
1da177e4
LT		 3063 if (pfx == NULL)
3064 return -EINVAL;
3065
461d8837 3066 if (tb[IFA_CACHEINFO]) {
0778769d 3067 struct ifa_cacheinfo *ci;
461d8837
TG		 3068
3069 ci = nla_data(tb[IFA_CACHEINFO]);
0778769d 3070 valid_lft = ci->ifa_valid;
461d8837
TG		 3071 preferred_lft = ci->ifa_prefered;
3072 } else {
3073 preferred_lft = INFINITY_LIFE_TIME;
3074 valid_lft = INFINITY_LIFE_TIME;
0778769d
NT		 3075 }
3076
881d966b 3077 dev = __dev_get_by_index(&init_net, ifm->ifa_index);
7198f8ce
TG		 3078 if (dev == NULL)
3079 return -ENODEV;
3080
55ebaef1 3081 /* We ignore other flags so far. */
3b9f9a1c 3082 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
55ebaef1 3083
7198f8ce
TG		 3084 ifa = ipv6_get_ifaddr(pfx, dev, 1);
3085 if (ifa == NULL) {
3086 /*
3087 * It would be best to check for !NLM_F_CREATE here but
3088 * userspace alreay relies on not having to provide this.
3089 */
3090 return inet6_addr_add(ifm->ifa_index, pfx, ifm->ifa_prefixlen,
55ebaef1 3091 ifa_flags, preferred_lft, valid_lft);
081bba5b
NT		 3092 }
3093
7198f8ce
TG		 3094 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3095 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3096 err = -EEXIST;
3097 else
55ebaef1 3098 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
7198f8ce
TG		 3099
3100 in6_ifa_put(ifa);
3101
3102 return err;
1da177e4
LT		 3103}
3104
101bb229
TG		 3105static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3106 u8 scope, int ifindex)
3107{
3108 struct ifaddrmsg *ifm;
3109
3110 ifm = nlmsg_data(nlh);
3111 ifm->ifa_family = AF_INET6;
3112 ifm->ifa_prefixlen = prefixlen;
3113 ifm->ifa_flags = flags;
3114 ifm->ifa_scope = scope;
3115 ifm->ifa_index = ifindex;
3116}
3117
85486af0
TG		 3118static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3119 unsigned long tstamp, u32 preferred, u32 valid)
3120{
3121 struct ifa_cacheinfo ci;
3122
3123 ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3124 + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3125 ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3126 + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3127 ci.ifa_prefered = preferred;
3128 ci.ifa_valid = valid;
3129
3130 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3131}
3132
101bb229
TG		 3133static inline int rt_scope(int ifa_scope)
3134{
3135 if (ifa_scope & IFA_HOST)
3136 return RT_SCOPE_HOST;
3137 else if (ifa_scope & IFA_LINK)
3138 return RT_SCOPE_LINK;
3139 else if (ifa_scope & IFA_SITE)
3140 return RT_SCOPE_SITE;
3141 else
3142 return RT_SCOPE_UNIVERSE;
3143}
3144
0ab6803b
TG		 3145static inline int inet6_ifaddr_msgsize(void)
3146{
339bf98f
TG		 3147 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3148 + nla_total_size(16) /* IFA_ADDRESS */
3149 + nla_total_size(sizeof(struct ifa_cacheinfo));
0ab6803b 3150}
c5396a31 3151
1da177e4 3152static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
b6544c0b 3153 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3154{
1da177e4 3155 struct nlmsghdr *nlh;
85486af0 3156 u32 preferred, valid;
1da177e4 3157
0ab6803b
TG		 3158 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3159 if (nlh == NULL)
26932566 3160 return -EMSGSIZE;
0ab6803b 3161
101bb229
TG		 3162 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3163 ifa->idev->dev->ifindex);
3164
1da177e4 3165 if (!(ifa->flags&IFA_F_PERMANENT)) {
85486af0
TG		 3166 preferred = ifa->prefered_lft;
3167 valid = ifa->valid_lft;
3168 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 3169 long tval = (jiffies - ifa->tstamp)/HZ;
85486af0
TG		 3170 preferred -= tval;
3171 if (valid != INFINITY_LIFE_TIME)
3172 valid -= tval;
1da177e4
LT		 3173 }
3174 } else {
85486af0
TG		 3175 preferred = INFINITY_LIFE_TIME;
3176 valid = INFINITY_LIFE_TIME;
3177 }
3178
0ab6803b 3179 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
26932566
PM		 3180 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3181 nlmsg_cancel(skb, nlh);
3182 return -EMSGSIZE;
3183 }
1da177e4 3184
0ab6803b 3185 return nlmsg_end(skb, nlh);
1da177e4
LT		 3186}
3187
3188static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
e431b8c0 3189 u32 pid, u32 seq, int event, u16 flags)
1da177e4 3190{
1da177e4 3191 struct nlmsghdr *nlh;
101bb229
TG		 3192 u8 scope = RT_SCOPE_UNIVERSE;
3193 int ifindex = ifmca->idev->dev->ifindex;
3194
3195 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3196 scope = RT_SCOPE_SITE;
1da177e4 3197
0ab6803b
TG		 3198 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3199 if (nlh == NULL)
26932566 3200 return -EMSGSIZE;
85486af0 3201
0ab6803b
TG		 3202 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3203 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3204 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 3205 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3206 nlmsg_cancel(skb, nlh);
3207 return -EMSGSIZE;
3208 }
85486af0 3209
0ab6803b 3210 return nlmsg_end(skb, nlh);
1da177e4
LT		 3211}
3212
3213static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
b6544c0b 3214 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3215{
1da177e4 3216 struct nlmsghdr *nlh;
101bb229
TG		 3217 u8 scope = RT_SCOPE_UNIVERSE;
3218 int ifindex = ifaca->aca_idev->dev->ifindex;
3219
3220 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3221 scope = RT_SCOPE_SITE;
1da177e4 3222
0ab6803b
TG		 3223 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3224 if (nlh == NULL)
26932566 3225 return -EMSGSIZE;
85486af0 3226
0ab6803b
TG		 3227 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3228 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3229 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 3230 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3231 nlmsg_cancel(skb, nlh);
3232 return -EMSGSIZE;
3233 }
1da177e4 3234
0ab6803b 3235 return nlmsg_end(skb, nlh);
1da177e4
LT		 3236}
3237
3238enum addr_type_t
3239{
3240 UNICAST_ADDR,
3241 MULTICAST_ADDR,
3242 ANYCAST_ADDR,
3243};
3244
3245static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3246 enum addr_type_t type)
3247{
3248 int idx, ip_idx;
3249 int s_idx, s_ip_idx;
3250 int err = 1;
3251 struct net_device *dev;
3252 struct inet6_dev *idev = NULL;
3253 struct inet6_ifaddr *ifa;
3254 struct ifmcaddr6 *ifmca;
3255 struct ifacaddr6 *ifaca;
3256
3257 s_idx = cb->args[0];
3258 s_ip_idx = ip_idx = cb->args[1];
1ab1457c 3259
7562f876 3260 idx = 0;
881d966b 3261 for_each_netdev(&init_net, dev) {
1da177e4 3262 if (idx < s_idx)
7562f876 3263 goto cont;
1da177e4
LT		 3264 if (idx > s_idx)
3265 s_ip_idx = 0;
3266 ip_idx = 0;
3267 if ((idev = in6_dev_get(dev)) == NULL)
7562f876 3268 goto cont;
1da177e4
LT		 3269 read_lock_bh(&idev->lock);
3270 switch (type) {
3271 case UNICAST_ADDR:
ae9cda5d 3272 /* unicast address incl. temp addr */
1da177e4
LT		 3273 for (ifa = idev->addr_list; ifa;
3274 ifa = ifa->if_next, ip_idx++) {
3275 if (ip_idx < s_ip_idx)
3276 continue;
1ab1457c
YH		 3277 if ((err = inet6_fill_ifaddr(skb, ifa,
3278 NETLINK_CB(cb->skb).pid,
b6544c0b
JHS		 3279 cb->nlh->nlmsg_seq, RTM_NEWADDR,
3280 NLM_F_MULTI)) <= 0)
1da177e4
LT		 3281 goto done;
3282 }
1da177e4
LT		 3283 break;
3284 case MULTICAST_ADDR:
3285 /* multicast address */
1ab1457c 3286 for (ifmca = idev->mc_list; ifmca;
1da177e4
LT		 3287 ifmca = ifmca->next, ip_idx++) {
3288 if (ip_idx < s_ip_idx)
3289 continue;
1ab1457c
YH		 3290 if ((err = inet6_fill_ifmcaddr(skb, ifmca,
3291 NETLINK_CB(cb->skb).pid,
b6544c0b
JHS		 3292 cb->nlh->nlmsg_seq, RTM_GETMULTICAST,
3293 NLM_F_MULTI)) <= 0)
1da177e4
LT		 3294 goto done;
3295 }
3296 break;
3297 case ANYCAST_ADDR:
3298 /* anycast address */
3299 for (ifaca = idev->ac_list; ifaca;
3300 ifaca = ifaca->aca_next, ip_idx++) {
3301 if (ip_idx < s_ip_idx)
3302 continue;
1ab1457c
YH		 3303 if ((err = inet6_fill_ifacaddr(skb, ifaca,
3304 NETLINK_CB(cb->skb).pid,
b6544c0b 3305 cb->nlh->nlmsg_seq, RTM_GETANYCAST,
1ab1457c 3306 NLM_F_MULTI)) <= 0)
1da177e4
LT		 3307 goto done;
3308 }
3309 break;
3310 default:
3311 break;
3312 }
3313 read_unlock_bh(&idev->lock);
3314 in6_dev_put(idev);
7562f876
PE		 3315cont:
3316 idx++;
1da177e4
LT		 3317 }
3318done:
3319 if (err <= 0) {
3320 read_unlock_bh(&idev->lock);
3321 in6_dev_put(idev);
3322 }
1da177e4
LT		 3323 cb->args[0] = idx;
3324 cb->args[1] = ip_idx;
3325 return skb->len;
3326}
3327
3328static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3329{
3330 enum addr_type_t type = UNICAST_ADDR;
3331 return inet6_dump_addr(skb, cb, type);
3332}
3333
3334static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3335{
3336 enum addr_type_t type = MULTICAST_ADDR;
3337 return inet6_dump_addr(skb, cb, type);
3338}
3339
3340
3341static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3342{
3343 enum addr_type_t type = ANYCAST_ADDR;
3344 return inet6_dump_addr(skb, cb, type);
3345}
3346
1b29fc2c
TG		 3347static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3348 void *arg)
6c223828 3349{
1b29fc2c
TG		 3350 struct ifaddrmsg *ifm;
3351 struct nlattr *tb[IFA_MAX+1];
6c223828
NT		 3352 struct in6_addr *addr = NULL;
3353 struct net_device *dev = NULL;
3354 struct inet6_ifaddr *ifa;
3355 struct sk_buff *skb;
6c223828
NT		 3356 int err;
3357
1b29fc2c
TG		 3358 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3359 if (err < 0)
3360 goto errout;
3361
3362 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3363 if (addr == NULL) {
3364 err = -EINVAL;
3365 goto errout;
6c223828 3366 }
6c223828 3367
1b29fc2c 3368 ifm = nlmsg_data(nlh);
6c223828 3369 if (ifm->ifa_index)
881d966b 3370 dev = __dev_get_by_index(&init_net, ifm->ifa_index);
6c223828 3371
1b29fc2c
TG		 3372 if ((ifa = ipv6_get_ifaddr(addr, dev, 1)) == NULL) {
3373 err = -EADDRNOTAVAIL;
3374 goto errout;
3375 }
6c223828 3376
0ab6803b 3377 if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) {
6c223828 3378 err = -ENOBUFS;
1b29fc2c 3379 goto errout_ifa;
6c223828
NT		 3380 }
3381
6c223828
NT		 3382 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3383 nlh->nlmsg_seq, RTM_NEWADDR, 0);
26932566
PM		 3384 if (err < 0) {
3385 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3386 WARN_ON(err == -EMSGSIZE);
3387 kfree_skb(skb);
3388 goto errout_ifa;
3389 }
2942e900 3390 err = rtnl_unicast(skb, NETLINK_CB(in_skb).pid);
1b29fc2c 3391errout_ifa:
6c223828 3392 in6_ifa_put(ifa);
1b29fc2c 3393errout:
6c223828 3394 return err;
6c223828
NT		 3395}
3396
1da177e4
LT		 3397static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3398{
3399 struct sk_buff *skb;
5d620266 3400 int err = -ENOBUFS;
1da177e4 3401
0ab6803b 3402 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5d620266
TG		 3403 if (skb == NULL)
3404 goto errout;
3405
3406 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
26932566
PM		 3407 if (err < 0) {
3408 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3409 WARN_ON(err == -EMSGSIZE);
3410 kfree_skb(skb);
3411 goto errout;
3412 }
5d620266
TG		 3413 err = rtnl_notify(skb, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3414errout:
3415 if (err < 0)
3416 rtnl_set_sk_err(RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 3417}
3418
b6f99a21 3419static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
1da177e4
LT		 3420 __s32 *array, int bytes)
3421{
04561c1f
TG		 3422 BUG_ON(bytes < (DEVCONF_MAX * 4));
3423
1da177e4
LT		 3424 memset(array, 0, bytes);
3425 array[DEVCONF_FORWARDING] = cnf->forwarding;
3426 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3427 array[DEVCONF_MTU6] = cnf->mtu6;
3428 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3429 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3430 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3431 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3432 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3433 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3434 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3435 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3436#ifdef CONFIG_IPV6_PRIVACY
3437 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3438 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3439 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3440 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3441 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3442#endif
3443 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 3444 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
c4fd30eb 3445 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 3446#ifdef CONFIG_IPV6_ROUTER_PREF
3447 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
52e16356 3448 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
fa03ef38 3449#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 3450 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3451#endif
930d6ff2 3452#endif
fbea49e1 3453 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
0bcbc926 3454 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
95c385b4
NH		 3455#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3456 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3457#endif
1da177e4
LT		 3458}
3459
339bf98f
TG		 3460static inline size_t inet6_if_nlmsg_size(void)
3461{
3462 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3463 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3464 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3465 + nla_total_size(4) /* IFLA_MTU */
3466 + nla_total_size(4) /* IFLA_LINK */
3467 + nla_total_size( /* IFLA_PROTINFO */
3468 nla_total_size(4) /* IFLA_INET6_FLAGS */
3469 + nla_total_size(sizeof(struct ifla_cacheinfo))
3470 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
bf99f1bd
YH		 3471 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3472 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
339bf98f
TG		 3473 );
3474}
c5396a31 3475
7f7d9a6b
HX		 3476static inline void __snmp6_fill_stats(u64 *stats, void **mib, int items,
3477 int bytes)
3478{
3479 int i;
3480 int pad = bytes - sizeof(u64) * items;
3481 BUG_ON(pad < 0);
3482
3483 /* Use put_unaligned() because stats may not be aligned for u64. */
3484 put_unaligned(items, &stats[0]);
3485 for (i = 1; i < items; i++)
3486 put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3487
3488 memset(&stats[items], 0, pad);
3489}
3490
3491static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3492 int bytes)
3493{
3494 switch(attrtype) {
3495 case IFLA_INET6_STATS:
3496 __snmp6_fill_stats(stats, (void **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes);
3497 break;
3498 case IFLA_INET6_ICMP6STATS:
3499 __snmp6_fill_stats(stats, (void **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
3500 break;
3501 }
3502}
3503
1ab1457c 3504static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
b6544c0b 3505 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3506{
04561c1f 3507 struct net_device *dev = idev->dev;
bf99f1bd 3508 struct nlattr *nla;
04561c1f
TG		 3509 struct ifinfomsg *hdr;
3510 struct nlmsghdr *nlh;
3511 void *protoinfo;
3512 struct ifla_cacheinfo ci;
3513
3514 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3515 if (nlh == NULL)
26932566 3516 return -EMSGSIZE;
04561c1f
TG		 3517
3518 hdr = nlmsg_data(nlh);
3519 hdr->ifi_family = AF_INET6;
3520 hdr->__ifi_pad = 0;
3521 hdr->ifi_type = dev->type;
3522 hdr->ifi_index = dev->ifindex;
3523 hdr->ifi_flags = dev_get_flags(dev);
3524 hdr->ifi_change = 0;
3525
3526 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
1da177e4
LT		 3527
3528 if (dev->addr_len)
04561c1f 3529 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
1da177e4 3530
04561c1f 3531 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
1da177e4 3532 if (dev->ifindex != dev->iflink)
04561c1f 3533 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
1da177e4 3534
04561c1f
TG		 3535 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3536 if (protoinfo == NULL)
3537 goto nla_put_failure;
1da177e4 3538
04561c1f 3539 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
1da177e4 3540
1da177e4
LT		 3541 ci.max_reasm_len = IPV6_MAXPLEN;
3542 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3543 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3544 ci.reachable_time = idev->nd_parms->reachable_time;
3545 ci.retrans_time = idev->nd_parms->retrans_time;
04561c1f
TG		 3546 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3547
bf99f1bd
YH		 3548 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3549 if (nla == NULL)
04561c1f 3550 goto nla_put_failure;
bf99f1bd 3551 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
1da177e4 3552
bf99f1bd
YH		 3553 /* XXX - MC not implemented */
3554
3555 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3556 if (nla == NULL)
3557 goto nla_put_failure;
3558 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3559
3560 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3561 if (nla == NULL)
3562 goto nla_put_failure;
3563 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
1da177e4 3564
04561c1f
TG		 3565 nla_nest_end(skb, protoinfo);
3566 return nlmsg_end(skb, nlh);
1da177e4 3567
04561c1f 3568nla_put_failure:
26932566
PM		 3569 nlmsg_cancel(skb, nlh);
3570 return -EMSGSIZE;
1da177e4
LT		 3571}
3572
3573static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3574{
3575 int idx, err;
3576 int s_idx = cb->args[0];
3577 struct net_device *dev;
3578 struct inet6_dev *idev;
3579
3580 read_lock(&dev_base_lock);
7562f876 3581 idx = 0;
881d966b 3582 for_each_netdev(&init_net, dev) {
1da177e4 3583 if (idx < s_idx)
7562f876 3584 goto cont;
1da177e4 3585 if ((idev = in6_dev_get(dev)) == NULL)
7562f876 3586 goto cont;
1ab1457c 3587 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
b6544c0b 3588 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
1da177e4
LT		 3589 in6_dev_put(idev);
3590 if (err <= 0)
3591 break;
7562f876
PE		 3592cont:
3593 idx++;
1da177e4
LT		 3594 }
3595 read_unlock(&dev_base_lock);
3596 cb->args[0] = idx;
3597
3598 return skb->len;
3599}
3600
3601void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3602{
3603 struct sk_buff *skb;
8d7a76c9 3604 int err = -ENOBUFS;
1ab1457c 3605
339bf98f 3606 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
8d7a76c9
TG		 3607 if (skb == NULL)
3608 goto errout;
3609
3610 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 3611 if (err < 0) {
3612 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3613 WARN_ON(err == -EMSGSIZE);
3614 kfree_skb(skb);
3615 goto errout;
3616 }
8d7a76c9
TG		 3617 err = rtnl_notify(skb, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3618errout:
3619 if (err < 0)
3620 rtnl_set_sk_err(RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 3621}
3622
339bf98f
TG		 3623static inline size_t inet6_prefix_nlmsg_size(void)
3624{
3625 return NLMSG_ALIGN(sizeof(struct prefixmsg))
3626 + nla_total_size(sizeof(struct in6_addr))
3627 + nla_total_size(sizeof(struct prefix_cacheinfo));
3628}
c5396a31 3629
1da177e4 3630static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
6051e2f4
TG		 3631 struct prefix_info *pinfo, u32 pid, u32 seq,
3632 int event, unsigned int flags)
1da177e4 3633{
6051e2f4
TG		 3634 struct prefixmsg *pmsg;
3635 struct nlmsghdr *nlh;
1da177e4
LT		 3636 struct prefix_cacheinfo ci;
3637
6051e2f4
TG		 3638 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
3639 if (nlh == NULL)
26932566 3640 return -EMSGSIZE;
6051e2f4
TG		 3641
3642 pmsg = nlmsg_data(nlh);
1da177e4 3643 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 3644 pmsg->prefix_pad1 = 0;
3645 pmsg->prefix_pad2 = 0;
1da177e4
LT		 3646 pmsg->prefix_ifindex = idev->dev->ifindex;
3647 pmsg->prefix_len = pinfo->prefix_len;
3648 pmsg->prefix_type = pinfo->type;
8a47077a 3649 pmsg->prefix_pad3 = 0;
1da177e4
LT		 3650 pmsg->prefix_flags = 0;
3651 if (pinfo->onlink)
3652 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3653 if (pinfo->autoconf)
3654 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3655
6051e2f4 3656 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
1da177e4
LT		 3657
3658 ci.preferred_time = ntohl(pinfo->prefered);
3659 ci.valid_time = ntohl(pinfo->valid);
6051e2f4 3660 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
1da177e4 3661
6051e2f4 3662 return nlmsg_end(skb, nlh);
1da177e4 3663
6051e2f4 3664nla_put_failure:
26932566
PM		 3665 nlmsg_cancel(skb, nlh);
3666 return -EMSGSIZE;
1da177e4
LT		 3667}
3668
1ab1457c 3669static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 3670 struct prefix_info *pinfo)
3671{
3672 struct sk_buff *skb;
8c384bfa 3673 int err = -ENOBUFS;
1da177e4 3674
339bf98f 3675 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
8c384bfa
TG		 3676 if (skb == NULL)
3677 goto errout;
3678
3679 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 3680 if (err < 0) {
3681 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
3682 WARN_ON(err == -EMSGSIZE);
3683 kfree_skb(skb);
3684 goto errout;
3685 }
8c384bfa
TG		 3686 err = rtnl_notify(skb, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
3687errout:
3688 if (err < 0)
3689 rtnl_set_sk_err(RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 3690}
3691
1da177e4
LT		 3692static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3693{
3694 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3695
3696 switch (event) {
3697 case RTM_NEWADDR:
95c385b4
NH		 3698 /*
3699 * If the address was optimistic
3700 * we inserted the route at the start of
3701 * our DAD process, so we don't need
3702 * to do it again
3703 */
3704 if (!(ifp->rt->rt6i_node))
3705 ip6_ins_rt(ifp->rt);
1da177e4
LT		 3706 if (ifp->idev->cnf.forwarding)
3707 addrconf_join_anycast(ifp);
3708 break;
3709 case RTM_DELADDR:
3710 if (ifp->idev->cnf.forwarding)
3711 addrconf_leave_anycast(ifp);
3712 addrconf_leave_solict(ifp->idev, &ifp->addr);
3713 dst_hold(&ifp->rt->u.dst);
e0a1ad73 3714 if (ip6_del_rt(ifp->rt))
1da177e4 3715 dst_free(&ifp->rt->u.dst);
1da177e4
LT		 3716 break;
3717 }
3718}
3719
3720static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3721{
8814c4b5 3722 rcu_read_lock_bh();
1da177e4
LT		 3723 if (likely(ifp->idev->dead == 0))
3724 __ipv6_ifa_notify(event, ifp);
8814c4b5 3725 rcu_read_unlock_bh();
1da177e4
LT		 3726}
3727
3728#ifdef CONFIG_SYSCTL
3729
3730static
3731int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3732 void __user *buffer, size_t *lenp, loff_t *ppos)
3733{
3734 int *valp = ctl->data;
3735 int val = *valp;
3736 int ret;
3737
3738 ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3739
3740 if (write && valp != &ipv6_devconf_dflt.forwarding) {
3741 if (valp != &ipv6_devconf.forwarding) {
3742 if ((!*valp) ^ (!val)) {
3743 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
3744 if (idev == NULL)
3745 return ret;
3746 dev_forward_change(idev);
3747 }
3748 } else {
3749 ipv6_devconf_dflt.forwarding = ipv6_devconf.forwarding;
3750 addrconf_forward_change();
3751 }
3752 if (*valp)
3753 rt6_purge_dflt_routers();
3754 }
3755
1ab1457c 3756 return ret;
1da177e4
LT		 3757}
3758
1ab1457c 3759static int addrconf_sysctl_forward_strategy(ctl_table *table,
1da177e4
LT		 3760 int __user *name, int nlen,
3761 void __user *oldval,
3762 size_t __user *oldlenp,
1f29bcd7 3763 void __user *newval, size_t newlen)
1da177e4
LT		 3764{
3765 int *valp = table->data;
3766 int new;
3767
3768 if (!newval || !newlen)
3769 return 0;
3770 if (newlen != sizeof(int))
3771 return -EINVAL;
3772 if (get_user(new, (int __user *)newval))
3773 return -EFAULT;
3774 if (new == *valp)
3775 return 0;
3776 if (oldval && oldlenp) {
3777 size_t len;
3778 if (get_user(len, oldlenp))
3779 return -EFAULT;
3780 if (len) {
3781 if (len > table->maxlen)
3782 len = table->maxlen;
3783 if (copy_to_user(oldval, valp, len))
3784 return -EFAULT;
3785 if (put_user(len, oldlenp))
3786 return -EFAULT;
3787 }
3788 }
3789
3790 if (valp != &ipv6_devconf_dflt.forwarding) {
3791 if (valp != &ipv6_devconf.forwarding) {
3792 struct inet6_dev *idev = (struct inet6_dev *)table->extra1;
3793 int changed;
3794 if (unlikely(idev == NULL))
3795 return -ENODEV;
3796 changed = (!*valp) ^ (!new);
3797 *valp = new;
3798 if (changed)
3799 dev_forward_change(idev);
3800 } else {
3801 *valp = new;
3802 addrconf_forward_change();
3803 }
3804
3805 if (*valp)
3806 rt6_purge_dflt_routers();
3807 } else
3808 *valp = new;
3809
3810 return 1;
3811}
3812
3813static struct addrconf_sysctl_table
3814{
3815 struct ctl_table_header *sysctl_header;
3816 ctl_table addrconf_vars[__NET_IPV6_MAX];
3817 ctl_table addrconf_dev[2];
3818 ctl_table addrconf_conf_dir[2];
3819 ctl_table addrconf_proto_dir[2];
3820 ctl_table addrconf_root_dir[2];
ab32ea5d 3821} addrconf_sysctl __read_mostly = {
1da177e4
LT		 3822 .sysctl_header = NULL,
3823 .addrconf_vars = {
1ab1457c 3824 {
1da177e4
LT		 3825 .ctl_name = NET_IPV6_FORWARDING,
3826 .procname = "forwarding",
1ab1457c 3827 .data = &ipv6_devconf.forwarding,
1da177e4
LT		 3828 .maxlen = sizeof(int),
3829 .mode = 0644,
1ab1457c 3830 .proc_handler = &addrconf_sysctl_forward,
1da177e4
LT		 3831 .strategy = &addrconf_sysctl_forward_strategy,
3832 },
3833 {
3834 .ctl_name = NET_IPV6_HOP_LIMIT,
3835 .procname = "hop_limit",
1ab1457c 3836 .data = &ipv6_devconf.hop_limit,
1da177e4
LT		 3837 .maxlen = sizeof(int),
3838 .mode = 0644,
3839 .proc_handler = proc_dointvec,
3840 },
3841 {
3842 .ctl_name = NET_IPV6_MTU,
3843 .procname = "mtu",
3844 .data = &ipv6_devconf.mtu6,
1ab1457c 3845 .maxlen = sizeof(int),
1da177e4 3846 .mode = 0644,
1ab1457c 3847 .proc_handler = &proc_dointvec,
1da177e4
LT		 3848 },
3849 {
3850 .ctl_name = NET_IPV6_ACCEPT_RA,
3851 .procname = "accept_ra",
1ab1457c 3852 .data = &ipv6_devconf.accept_ra,
1da177e4
LT		 3853 .maxlen = sizeof(int),
3854 .mode = 0644,
1ab1457c 3855 .proc_handler = &proc_dointvec,
1da177e4
LT		 3856 },
3857 {
3858 .ctl_name = NET_IPV6_ACCEPT_REDIRECTS,
3859 .procname = "accept_redirects",
1ab1457c 3860 .data = &ipv6_devconf.accept_redirects,
1da177e4
LT		 3861 .maxlen = sizeof(int),
3862 .mode = 0644,
1ab1457c 3863 .proc_handler = &proc_dointvec,
1da177e4
LT		 3864 },
3865 {
3866 .ctl_name = NET_IPV6_AUTOCONF,
3867 .procname = "autoconf",
1ab1457c 3868 .data = &ipv6_devconf.autoconf,
1da177e4
LT		 3869 .maxlen = sizeof(int),
3870 .mode = 0644,
1ab1457c 3871 .proc_handler = &proc_dointvec,
1da177e4
LT		 3872 },
3873 {
3874 .ctl_name = NET_IPV6_DAD_TRANSMITS,
3875 .procname = "dad_transmits",
1ab1457c 3876 .data = &ipv6_devconf.dad_transmits,
1da177e4
LT		 3877 .maxlen = sizeof(int),
3878 .mode = 0644,
1ab1457c 3879 .proc_handler = &proc_dointvec,
1da177e4
LT		 3880 },
3881 {
3882 .ctl_name = NET_IPV6_RTR_SOLICITS,
3883 .procname = "router_solicitations",
1ab1457c 3884 .data = &ipv6_devconf.rtr_solicits,
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_SOLICIT_INTERVAL,
3891 .procname = "router_solicitation_interval",
1ab1457c 3892 .data = &ipv6_devconf.rtr_solicit_interval,
1da177e4
LT		 3893 .maxlen = sizeof(int),
3894 .mode = 0644,
1ab1457c 3895 .proc_handler = &proc_dointvec_jiffies,
1da177e4
LT		 3896 .strategy = &sysctl_jiffies,
3897 },
3898 {
3899 .ctl_name = NET_IPV6_RTR_SOLICIT_DELAY,
3900 .procname = "router_solicitation_delay",
1ab1457c 3901 .data = &ipv6_devconf.rtr_solicit_delay,
1da177e4
LT		 3902 .maxlen = sizeof(int),
3903 .mode = 0644,
1ab1457c 3904 .proc_handler = &proc_dointvec_jiffies,
1da177e4
LT		 3905 .strategy = &sysctl_jiffies,
3906 },
3907 {
3908 .ctl_name = NET_IPV6_FORCE_MLD_VERSION,
3909 .procname = "force_mld_version",
1ab1457c 3910 .data = &ipv6_devconf.force_mld_version,
1da177e4
LT		 3911 .maxlen = sizeof(int),
3912 .mode = 0644,
1ab1457c 3913 .proc_handler = &proc_dointvec,
1da177e4
LT		 3914 },
3915#ifdef CONFIG_IPV6_PRIVACY
3916 {
3917 .ctl_name = NET_IPV6_USE_TEMPADDR,
3918 .procname = "use_tempaddr",
1ab1457c 3919 .data = &ipv6_devconf.use_tempaddr,
1da177e4
LT		 3920 .maxlen = sizeof(int),
3921 .mode = 0644,
1ab1457c 3922 .proc_handler = &proc_dointvec,
1da177e4
LT		 3923 },
3924 {
3925 .ctl_name = NET_IPV6_TEMP_VALID_LFT,
3926 .procname = "temp_valid_lft",
1ab1457c 3927 .data = &ipv6_devconf.temp_valid_lft,
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_PREFERED_LFT,
3934 .procname = "temp_prefered_lft",
1ab1457c 3935 .data = &ipv6_devconf.temp_prefered_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_REGEN_MAX_RETRY,
3942 .procname = "regen_max_retry",
1ab1457c 3943 .data = &ipv6_devconf.regen_max_retry,
1da177e4
LT		 3944 .maxlen = sizeof(int),
3945 .mode = 0644,
1ab1457c 3946 .proc_handler = &proc_dointvec,
1da177e4
LT		 3947 },
3948 {
3949 .ctl_name = NET_IPV6_MAX_DESYNC_FACTOR,
3950 .procname = "max_desync_factor",
1ab1457c 3951 .data = &ipv6_devconf.max_desync_factor,
1da177e4
LT		 3952 .maxlen = sizeof(int),
3953 .mode = 0644,
1ab1457c 3954 .proc_handler = &proc_dointvec,
1da177e4
LT		 3955 },
3956#endif
3957 {
3958 .ctl_name = NET_IPV6_MAX_ADDRESSES,
3959 .procname = "max_addresses",
3960 .data = &ipv6_devconf.max_addresses,
3961 .maxlen = sizeof(int),
3962 .mode = 0644,
3963 .proc_handler = &proc_dointvec,
3964 },
65f5c7c1
YH		 3965 {
3966 .ctl_name = NET_IPV6_ACCEPT_RA_DEFRTR,
3967 .procname = "accept_ra_defrtr",
1ab1457c 3968 .data = &ipv6_devconf.accept_ra_defrtr,
65f5c7c1
YH		 3969 .maxlen = sizeof(int),
3970 .mode = 0644,
1ab1457c 3971 .proc_handler = &proc_dointvec,
65f5c7c1 3972 },
c4fd30eb
YH		 3973 {
3974 .ctl_name = NET_IPV6_ACCEPT_RA_PINFO,
3975 .procname = "accept_ra_pinfo",
1ab1457c 3976 .data = &ipv6_devconf.accept_ra_pinfo,
c4fd30eb
YH		 3977 .maxlen = sizeof(int),
3978 .mode = 0644,
1ab1457c 3979 .proc_handler = &proc_dointvec,
c4fd30eb 3980 },
930d6ff2
YH		 3981#ifdef CONFIG_IPV6_ROUTER_PREF
3982 {
3983 .ctl_name = NET_IPV6_ACCEPT_RA_RTR_PREF,
3984 .procname = "accept_ra_rtr_pref",
3985 .data = &ipv6_devconf.accept_ra_rtr_pref,
3986 .maxlen = sizeof(int),
3987 .mode = 0644,
3988 .proc_handler = &proc_dointvec,
3989 },
52e16356
YH		 3990 {
3991 .ctl_name = NET_IPV6_RTR_PROBE_INTERVAL,
3992 .procname = "router_probe_interval",
3993 .data = &ipv6_devconf.rtr_probe_interval,
3994 .maxlen = sizeof(int),
3995 .mode = 0644,
3996 .proc_handler = &proc_dointvec_jiffies,
3997 .strategy = &sysctl_jiffies,
3998 },
fa03ef38 3999#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 4000 {
4001 .ctl_name = NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN,
4002 .procname = "accept_ra_rt_info_max_plen",
4003 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4004 .maxlen = sizeof(int),
4005 .mode = 0644,
4006 .proc_handler = &proc_dointvec,
4007 },
4008#endif
930d6ff2 4009#endif
fbea49e1
YH		 4010 {
4011 .ctl_name = NET_IPV6_PROXY_NDP,
4012 .procname = "proxy_ndp",
4013 .data = &ipv6_devconf.proxy_ndp,
4014 .maxlen = sizeof(int),
4015 .mode = 0644,
4016 .proc_handler = &proc_dointvec,
4017 },
0bcbc926
YH		 4018 {
4019 .ctl_name = NET_IPV6_ACCEPT_SOURCE_ROUTE,
4020 .procname = "accept_source_route",
4021 .data = &ipv6_devconf.accept_source_route,
4022 .maxlen = sizeof(int),
4023 .mode = 0644,
4024 .proc_handler = &proc_dointvec,
4025 },
95c385b4
NH		 4026#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4027 {
4028 .ctl_name = CTL_UNNUMBERED,
4029 .procname = "optimistic_dad",
4030 .data = &ipv6_devconf.optimistic_dad,
4031 .maxlen = sizeof(int),
4032 .mode = 0644,
4033 .proc_handler = &proc_dointvec,
4034
4035 },
4036#endif
1da177e4
LT		 4037 {
4038 .ctl_name = 0, /* sentinel */
4039 }
4040 },
4041 .addrconf_dev = {
4042 {
4043 .ctl_name = NET_PROTO_CONF_ALL,
4044 .procname = "all",
4045 .mode = 0555,
4046 .child = addrconf_sysctl.addrconf_vars,
4047 },
4048 {
4049 .ctl_name = 0, /* sentinel */
4050 }
4051 },
4052 .addrconf_conf_dir = {
4053 {
4054 .ctl_name = NET_IPV6_CONF,
4055 .procname = "conf",
4056 .mode = 0555,
4057 .child = addrconf_sysctl.addrconf_dev,
4058 },
4059 {
4060 .ctl_name = 0, /* sentinel */
4061 }
4062 },
4063 .addrconf_proto_dir = {
4064 {
4065 .ctl_name = NET_IPV6,
4066 .procname = "ipv6",
4067 .mode = 0555,
4068 .child = addrconf_sysctl.addrconf_conf_dir,
4069 },
4070 {
4071 .ctl_name = 0, /* sentinel */
4072 }
4073 },
4074 .addrconf_root_dir = {
4075 {
4076 .ctl_name = CTL_NET,
4077 .procname = "net",
4078 .mode = 0555,
4079 .child = addrconf_sysctl.addrconf_proto_dir,
4080 },
4081 {
4082 .ctl_name = 0, /* sentinel */
4083 }
4084 },
4085};
4086
4087static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p)
4088{
4089 int i;
4090 struct net_device *dev = idev ? idev->dev : NULL;
4091 struct addrconf_sysctl_table *t;
4092 char *dev_name = NULL;
4093
af879cc7 4094 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
1da177e4
LT		 4095 if (t == NULL)
4096 return;
1da177e4
LT		 4097 for (i=0; t->addrconf_vars[i].data; i++) {
4098 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
1da177e4
LT		 4099 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4100 }
4101 if (dev) {
1ab1457c 4102 dev_name = dev->name;
1da177e4
LT		 4103 t->addrconf_dev[0].ctl_name = dev->ifindex;
4104 } else {
4105 dev_name = "default";
4106 t->addrconf_dev[0].ctl_name = NET_PROTO_CONF_DEFAULT;
4107 }
4108
1ab1457c
YH		 4109 /*
4110 * Make a copy of dev_name, because '.procname' is regarded as const
1da177e4
LT		 4111 * by sysctl and we wouldn't want anyone to change it under our feet
4112 * (see SIOCSIFNAME).
1ab1457c 4113 */
543537bd 4114 dev_name = kstrdup(dev_name, GFP_KERNEL);
1da177e4
LT		 4115 if (!dev_name)
4116 goto free;
4117
4118 t->addrconf_dev[0].procname = dev_name;
4119
4120 t->addrconf_dev[0].child = t->addrconf_vars;
1da177e4 4121 t->addrconf_conf_dir[0].child = t->addrconf_dev;
1da177e4 4122 t->addrconf_proto_dir[0].child = t->addrconf_conf_dir;
1da177e4 4123 t->addrconf_root_dir[0].child = t->addrconf_proto_dir;
1da177e4 4124
0b4d4147 4125 t->sysctl_header = register_sysctl_table(t->addrconf_root_dir);
1da177e4
LT		 4126 if (t->sysctl_header == NULL)
4127 goto free_procname;
4128 else
4129 p->sysctl = t;
4130 return;
4131
4132 /* error path */
4133 free_procname:
4134 kfree(dev_name);
4135 free:
4136 kfree(t);
4137
4138 return;
4139}
4140
4141static void addrconf_sysctl_unregister(struct ipv6_devconf *p)
4142{
4143 if (p->sysctl) {
4144 struct addrconf_sysctl_table *t = p->sysctl;
4145 p->sysctl = NULL;
4146 unregister_sysctl_table(t->sysctl_header);
4147 kfree(t->addrconf_dev[0].procname);
4148 kfree(t);
4149 }
4150}
4151
4152
4153#endif
4154
4155/*
4156 * Device notifier
4157 */
4158
4159int register_inet6addr_notifier(struct notifier_block *nb)
4160{
1ab1457c 4161 return atomic_notifier_chain_register(&inet6addr_chain, nb);
1da177e4
LT		 4162}
4163
7159039a
YH		 4164EXPORT_SYMBOL(register_inet6addr_notifier);
4165
1da177e4
LT		 4166int unregister_inet6addr_notifier(struct notifier_block *nb)
4167{
1ab1457c 4168 return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
1da177e4
LT		 4169}
4170
7159039a
YH		 4171EXPORT_SYMBOL(unregister_inet6addr_notifier);
4172
1da177e4
LT		 4173/*
4174 * Init / cleanup code
4175 */
4176
4177int __init addrconf_init(void)
4178{
4179 int err = 0;
4180
4181 /* The addrconf netdev notifier requires that loopback_dev
4182 * has it's ipv6 private information allocated and setup
4183 * before it can bring up and give link-local addresses
4184 * to other devices which are up.
4185 *
4186 * Unfortunately, loopback_dev is not necessarily the first
4187 * entry in the global dev_base list of net devices. In fact,
4188 * it is likely to be the very last entry on that list.
4189 * So this causes the notifier registry below to try and
4190 * give link-local addresses to all devices besides loopback_dev
4191 * first, then loopback_dev, which cases all the non-loopback_dev
4192 * devices to fail to get a link-local address.
4193 *
4194 * So, as a temporary fix, allocate the ipv6 structure for
4195 * loopback_dev first by hand.
4196 * Longer term, all of the dependencies ipv6 has upon the loopback
4197 * device and it being up should be removed.
4198 */
4199 rtnl_lock();
2774c7ab 4200 if (!ipv6_add_dev(init_net.loopback_dev))
1da177e4
LT		 4201 err = -ENOMEM;
4202 rtnl_unlock();
4203 if (err)
4204 return err;
4205
2774c7ab
EB		 4206 ip6_null_entry.u.dst.dev = init_net.loopback_dev;
4207 ip6_null_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev);
9a6bf6fe 4208#ifdef CONFIG_IPV6_MULTIPLE_TABLES
2774c7ab
EB		 4209 ip6_prohibit_entry.u.dst.dev = init_net.loopback_dev;
4210 ip6_prohibit_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev);
4211 ip6_blk_hole_entry.u.dst.dev = init_net.loopback_dev;
4212 ip6_blk_hole_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev);
9a6bf6fe 4213#endif
c62dba90 4214
1da177e4
LT		 4215 register_netdevice_notifier(&ipv6_dev_notf);
4216
1da177e4 4217 addrconf_verify(0);
c127ea2c
TG		 4218
4219 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4220 if (err < 0)
4221 goto errout;
4222
4223 /* Only the first call to __rtnl_register can fail */
4224 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4225 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4226 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4227 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4228 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4229
1da177e4
LT		 4230#ifdef CONFIG_SYSCTL
4231 addrconf_sysctl.sysctl_header =
0b4d4147 4232 register_sysctl_table(addrconf_sysctl.addrconf_root_dir);
1da177e4
LT		 4233 addrconf_sysctl_register(NULL, &ipv6_devconf_dflt);
4234#endif
4235
4236 return 0;
c127ea2c
TG		 4237errout:
4238 unregister_netdevice_notifier(&ipv6_dev_notf);
4239
4240 return err;
1da177e4
LT		 4241}
4242
4243void __exit addrconf_cleanup(void)
4244{
1ab1457c 4245 struct net_device *dev;
1ab1457c 4246 struct inet6_ifaddr *ifa;
1da177e4
LT		 4247 int i;
4248
4249 unregister_netdevice_notifier(&ipv6_dev_notf);
4250
1da177e4
LT		 4251#ifdef CONFIG_SYSCTL
4252 addrconf_sysctl_unregister(&ipv6_devconf_dflt);
4253 addrconf_sysctl_unregister(&ipv6_devconf);
4254#endif
4255
4256 rtnl_lock();
4257
4258 /*
4259 * clean dev list.
4260 */
4261
881d966b 4262 for_each_netdev(&init_net, dev) {
dffe4f04 4263 if (__in6_dev_get(dev) == NULL)
1da177e4
LT		 4264 continue;
4265 addrconf_ifdown(dev, 1);
4266 }
2774c7ab 4267 addrconf_ifdown(init_net.loopback_dev, 2);
1da177e4
LT		 4268
4269 /*
4270 * Check hash table.
4271 */
4272
4273 write_lock_bh(&addrconf_hash_lock);
4274 for (i=0; i < IN6_ADDR_HSIZE; i++) {
4275 for (ifa=inet6_addr_lst[i]; ifa; ) {
4276 struct inet6_ifaddr *bifa;
4277
4278 bifa = ifa;
4279 ifa = ifa->lst_next;
4280 printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
4281 /* Do not free it; something is wrong.
4282 Now we can investigate it with debugger.
4283 */
4284 }
4285 }
4286 write_unlock_bh(&addrconf_hash_lock);
4287
4288 del_timer(&addr_chk_timer);
4289
4290 rtnl_unlock();
1da177e4 4291}
Clone of davem's net-next-2.6 tree