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[PATCH] stop_machine.c copyright
[linux-2.6/sactl.git] / net / ipv6 / addrconf.c
blobe03c33b2465bc72415c8e27dce382db233959a69
1 /*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
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.
38 * YOSHIFUJI Hideaki @USAGI : improved source address
39 * selection; consider scope,
40 * status etc.
41 */
42
43 #include <linux/errno.h>
44 #include <linux/types.h>
45 #include <linux/socket.h>
46 #include <linux/sockios.h>
47 #include <linux/sched.h>
48 #include <linux/net.h>
49 #include <linux/in6.h>
50 #include <linux/netdevice.h>
51 #include <linux/if_addr.h>
52 #include <linux/if_arp.h>
53 #include <linux/if_arcnet.h>
54 #include <linux/if_infiniband.h>
55 #include <linux/route.h>
56 #include <linux/inetdevice.h>
57 #include <linux/init.h>
58 #ifdef CONFIG_SYSCTL
59 #include <linux/sysctl.h>
60 #endif
61 #include <linux/capability.h>
62 #include <linux/delay.h>
63 #include <linux/notifier.h>
64 #include <linux/string.h>
65
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>
76 #include <net/netlink.h>
77 #include <linux/if_tunnel.h>
78 #include <linux/rtnetlink.h>
79
80 #ifdef CONFIG_IPV6_PRIVACY
81 #include <linux/random.h>
82 #endif
83
84 #include <asm/uaccess.h>
85
86 #include <linux/proc_fs.h>
87 #include <linux/seq_file.h>
88
89 /* Set to 3 to get tracing... */
90 #define ACONF_DEBUG 2
91
92 #if ACONF_DEBUG >= 3
93 #define ADBG(x) printk x
94 #else
95 #define ADBG(x)
96 #endif
97
98 #define INFINITY_LIFE_TIME 0xFFFFFFFF
99 #define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b)))
100
101 #ifdef CONFIG_SYSCTL
102 static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p);
103 static void addrconf_sysctl_unregister(struct ipv6_devconf *p);
104 #endif
105
106 #ifdef CONFIG_IPV6_PRIVACY
107 static int __ipv6_regen_rndid(struct inet6_dev *idev);
108 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
109 static void ipv6_regen_rndid(unsigned long data);
110
111 static int desync_factor = MAX_DESYNC_FACTOR * HZ;
112 #endif
113
114 static int ipv6_count_addresses(struct inet6_dev *idev);
115
116 /*
117 * Configured unicast address hash table
118 */
119 static struct inet6_ifaddr *inet6_addr_lst[IN6_ADDR_HSIZE];
120 static DEFINE_RWLOCK(addrconf_hash_lock);
121
122 static void addrconf_verify(unsigned long);
123
124 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
125 static DEFINE_SPINLOCK(addrconf_verify_lock);
126
127 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
128 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
129
130 static int addrconf_ifdown(struct net_device *dev, int how);
131
132 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
133 static void addrconf_dad_timer(unsigned long data);
134 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
135 static void addrconf_dad_run(struct inet6_dev *idev);
136 static void addrconf_rs_timer(unsigned long data);
137 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
138 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
139
140 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
141 struct prefix_info *pinfo);
142 static int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev);
143
144 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
145
146 struct ipv6_devconf ipv6_devconf __read_mostly = {
147 .forwarding = 0,
148 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
149 .mtu6 = IPV6_MIN_MTU,
150 .accept_ra = 1,
151 .accept_redirects = 1,
152 .autoconf = 1,
153 .force_mld_version = 0,
154 .dad_transmits = 1,
155 .rtr_solicits = MAX_RTR_SOLICITATIONS,
156 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
157 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
158 #ifdef CONFIG_IPV6_PRIVACY
159 .use_tempaddr = 0,
160 .temp_valid_lft = TEMP_VALID_LIFETIME,
161 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
162 .regen_max_retry = REGEN_MAX_RETRY,
163 .max_desync_factor = MAX_DESYNC_FACTOR,
164 #endif
165 .max_addresses = IPV6_MAX_ADDRESSES,
166 .accept_ra_defrtr = 1,
167 .accept_ra_pinfo = 1,
168 #ifdef CONFIG_IPV6_ROUTER_PREF
169 .accept_ra_rtr_pref = 1,
170 .rtr_probe_interval = 60 * HZ,
171 #ifdef CONFIG_IPV6_ROUTE_INFO
172 .accept_ra_rt_info_max_plen = 0,
173 #endif
174 #endif
175 .proxy_ndp = 0,
176 };
177
178 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
179 .forwarding = 0,
180 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
181 .mtu6 = IPV6_MIN_MTU,
182 .accept_ra = 1,
183 .accept_redirects = 1,
184 .autoconf = 1,
185 .dad_transmits = 1,
186 .rtr_solicits = MAX_RTR_SOLICITATIONS,
187 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
188 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
189 #ifdef CONFIG_IPV6_PRIVACY
190 .use_tempaddr = 0,
191 .temp_valid_lft = TEMP_VALID_LIFETIME,
192 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
193 .regen_max_retry = REGEN_MAX_RETRY,
194 .max_desync_factor = MAX_DESYNC_FACTOR,
195 #endif
196 .max_addresses = IPV6_MAX_ADDRESSES,
197 .accept_ra_defrtr = 1,
198 .accept_ra_pinfo = 1,
199 #ifdef CONFIG_IPV6_ROUTER_PREF
200 .accept_ra_rtr_pref = 1,
201 .rtr_probe_interval = 60 * HZ,
202 #ifdef CONFIG_IPV6_ROUTE_INFO
203 .accept_ra_rt_info_max_plen = 0,
204 #endif
205 #endif
206 .proxy_ndp = 0,
207 };
208
209 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
210 #if 0
211 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
212 #endif
213 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
214
215 #define IPV6_ADDR_SCOPE_TYPE(scope) ((scope) << 16)
216
217 static inline unsigned ipv6_addr_scope2type(unsigned scope)
218 {
219 switch(scope) {
220 case IPV6_ADDR_SCOPE_NODELOCAL:
221 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_NODELOCAL) |
222 IPV6_ADDR_LOOPBACK);
223 case IPV6_ADDR_SCOPE_LINKLOCAL:
224 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL) |
225 IPV6_ADDR_LINKLOCAL);
226 case IPV6_ADDR_SCOPE_SITELOCAL:
227 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_SITELOCAL) |
228 IPV6_ADDR_SITELOCAL);
229 }
230 return IPV6_ADDR_SCOPE_TYPE(scope);
231 }
232
233 int __ipv6_addr_type(const struct in6_addr *addr)
234 {
235 u32 st;
236
237 st = addr->s6_addr32[0];
238
239 /* Consider all addresses with the first three bits different of
240 000 and 111 as unicasts.
241 */
242 if ((st & htonl(0xE0000000)) != htonl(0x00000000) &&
243 (st & htonl(0xE0000000)) != htonl(0xE0000000))
244 return (IPV6_ADDR_UNICAST |
245 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));
246
247 if ((st & htonl(0xFF000000)) == htonl(0xFF000000)) {
248 /* multicast */
249 /* addr-select 3.1 */
250 return (IPV6_ADDR_MULTICAST |
251 ipv6_addr_scope2type(IPV6_ADDR_MC_SCOPE(addr)));
252 }
253
254 if ((st & htonl(0xFFC00000)) == htonl(0xFE800000))
255 return (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_UNICAST |
256 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL)); /* addr-select 3.1 */
257 if ((st & htonl(0xFFC00000)) == htonl(0xFEC00000))
258 return (IPV6_ADDR_SITELOCAL | IPV6_ADDR_UNICAST |
259 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_SITELOCAL)); /* addr-select 3.1 */
260
261 if ((addr->s6_addr32[0] | addr->s6_addr32[1]) == 0) {
262 if (addr->s6_addr32[2] == 0) {
263 if (addr->s6_addr32[3] == 0)
264 return IPV6_ADDR_ANY;
265
266 if (addr->s6_addr32[3] == htonl(0x00000001))
267 return (IPV6_ADDR_LOOPBACK | IPV6_ADDR_UNICAST |
268 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL)); /* addr-select 3.4 */
269
270 return (IPV6_ADDR_COMPATv4 | IPV6_ADDR_UNICAST |
271 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* addr-select 3.3 */
272 }
273
274 if (addr->s6_addr32[2] == htonl(0x0000ffff))
275 return (IPV6_ADDR_MAPPED |
276 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* addr-select 3.3 */
277 }
278
279 return (IPV6_ADDR_RESERVED |
280 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* addr-select 3.4 */
281 }
282
283 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
284 {
285 if (del_timer(&ifp->timer))
286 __in6_ifa_put(ifp);
287 }
288
289 enum addrconf_timer_t
290 {
291 AC_NONE,
292 AC_DAD,
293 AC_RS,
294 };
295
296 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
297 enum addrconf_timer_t what,
298 unsigned long when)
299 {
300 if (!del_timer(&ifp->timer))
301 in6_ifa_hold(ifp);
302
303 switch (what) {
304 case AC_DAD:
305 ifp->timer.function = addrconf_dad_timer;
306 break;
307 case AC_RS:
308 ifp->timer.function = addrconf_rs_timer;
309 break;
310 default:;
311 }
312 ifp->timer.expires = jiffies + when;
313 add_timer(&ifp->timer);
314 }
315
316 /* Nobody refers to this device, we may destroy it. */
317
318 static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
319 {
320 struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
321 kfree(idev);
322 }
323
324 void in6_dev_finish_destroy(struct inet6_dev *idev)
325 {
326 struct net_device *dev = idev->dev;
327 BUG_TRAP(idev->addr_list==NULL);
328 BUG_TRAP(idev->mc_list==NULL);
329 #ifdef NET_REFCNT_DEBUG
330 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
331 #endif
332 dev_put(dev);
333 if (!idev->dead) {
334 printk("Freeing alive inet6 device %p\n", idev);
335 return;
336 }
337 snmp6_free_dev(idev);
338 call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
339 }
340
341 static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
342 {
343 struct inet6_dev *ndev;
344
345 ASSERT_RTNL();
346
347 if (dev->mtu < IPV6_MIN_MTU)
348 return NULL;
349
350 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
351
352 if (ndev == NULL)
353 return NULL;
354
355 rwlock_init(&ndev->lock);
356 ndev->dev = dev;
357 memcpy(&ndev->cnf, &ipv6_devconf_dflt, sizeof(ndev->cnf));
358 ndev->cnf.mtu6 = dev->mtu;
359 ndev->cnf.sysctl = NULL;
360 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
361 if (ndev->nd_parms == NULL) {
362 kfree(ndev);
363 return NULL;
364 }
365 /* We refer to the device */
366 dev_hold(dev);
367
368 if (snmp6_alloc_dev(ndev) < 0) {
369 ADBG((KERN_WARNING
370 "%s(): cannot allocate memory for statistics; dev=%s.\n",
371 __FUNCTION__, dev->name));
372 neigh_parms_release(&nd_tbl, ndev->nd_parms);
373 ndev->dead = 1;
374 in6_dev_finish_destroy(ndev);
375 return NULL;
376 }
377
378 if (snmp6_register_dev(ndev) < 0) {
379 ADBG((KERN_WARNING
380 "%s(): cannot create /proc/net/dev_snmp6/%s\n",
381 __FUNCTION__, dev->name));
382 neigh_parms_release(&nd_tbl, ndev->nd_parms);
383 ndev->dead = 1;
384 in6_dev_finish_destroy(ndev);
385 return NULL;
386 }
387
388 /* One reference from device. We must do this before
389 * we invoke __ipv6_regen_rndid().
390 */
391 in6_dev_hold(ndev);
392
393 #ifdef CONFIG_IPV6_PRIVACY
394 init_timer(&ndev->regen_timer);
395 ndev->regen_timer.function = ipv6_regen_rndid;
396 ndev->regen_timer.data = (unsigned long) ndev;
397 if ((dev->flags&IFF_LOOPBACK) ||
398 dev->type == ARPHRD_TUNNEL ||
399 dev->type == ARPHRD_NONE ||
400 dev->type == ARPHRD_SIT) {
401 printk(KERN_INFO
402 "%s: Disabled Privacy Extensions\n",
403 dev->name);
404 ndev->cnf.use_tempaddr = -1;
405 } else {
406 in6_dev_hold(ndev);
407 ipv6_regen_rndid((unsigned long) ndev);
408 }
409 #endif
410
411 if (netif_carrier_ok(dev))
412 ndev->if_flags |= IF_READY;
413
414 /* protected by rtnl_lock */
415 rcu_assign_pointer(dev->ip6_ptr, ndev);
416
417 ipv6_mc_init_dev(ndev);
418 ndev->tstamp = jiffies;
419 #ifdef CONFIG_SYSCTL
420 neigh_sysctl_register(dev, ndev->nd_parms, NET_IPV6,
421 NET_IPV6_NEIGH, "ipv6",
422 &ndisc_ifinfo_sysctl_change,
423 NULL);
424 addrconf_sysctl_register(ndev, &ndev->cnf);
425 #endif
426 return ndev;
427 }
428
429 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
430 {
431 struct inet6_dev *idev;
432
433 ASSERT_RTNL();
434
435 if ((idev = __in6_dev_get(dev)) == NULL) {
436 if ((idev = ipv6_add_dev(dev)) == NULL)
437 return NULL;
438 }
439
440 if (dev->flags&IFF_UP)
441 ipv6_mc_up(idev);
442 return idev;
443 }
444
445 #ifdef CONFIG_SYSCTL
446 static void dev_forward_change(struct inet6_dev *idev)
447 {
448 struct net_device *dev;
449 struct inet6_ifaddr *ifa;
450 struct in6_addr addr;
451
452 if (!idev)
453 return;
454 dev = idev->dev;
455 if (dev && (dev->flags & IFF_MULTICAST)) {
456 ipv6_addr_all_routers(&addr);
457
458 if (idev->cnf.forwarding)
459 ipv6_dev_mc_inc(dev, &addr);
460 else
461 ipv6_dev_mc_dec(dev, &addr);
462 }
463 for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
464 if (idev->cnf.forwarding)
465 addrconf_join_anycast(ifa);
466 else
467 addrconf_leave_anycast(ifa);
468 }
469 }
470
471
472 static void addrconf_forward_change(void)
473 {
474 struct net_device *dev;
475 struct inet6_dev *idev;
476
477 read_lock(&dev_base_lock);
478 for (dev=dev_base; dev; dev=dev->next) {
479 rcu_read_lock();
480 idev = __in6_dev_get(dev);
481 if (idev) {
482 int changed = (!idev->cnf.forwarding) ^ (!ipv6_devconf.forwarding);
483 idev->cnf.forwarding = ipv6_devconf.forwarding;
484 if (changed)
485 dev_forward_change(idev);
486 }
487 rcu_read_unlock();
488 }
489 read_unlock(&dev_base_lock);
490 }
491 #endif
492
493 /* Nobody refers to this ifaddr, destroy it */
494
495 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
496 {
497 BUG_TRAP(ifp->if_next==NULL);
498 BUG_TRAP(ifp->lst_next==NULL);
499 #ifdef NET_REFCNT_DEBUG
500 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
501 #endif
502
503 in6_dev_put(ifp->idev);
504
505 if (del_timer(&ifp->timer))
506 printk("Timer is still running, when freeing ifa=%p\n", ifp);
507
508 if (!ifp->dead) {
509 printk("Freeing alive inet6 address %p\n", ifp);
510 return;
511 }
512 dst_release(&ifp->rt->u.dst);
513
514 kfree(ifp);
515 }
516
517 static void
518 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
519 {
520 struct inet6_ifaddr *ifa, **ifap;
521 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
522
523 /*
524 * Each device address list is sorted in order of scope -
525 * global before linklocal.
526 */
527 for (ifap = &idev->addr_list; (ifa = *ifap) != NULL;
528 ifap = &ifa->if_next) {
529 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
530 break;
531 }
532
533 ifp->if_next = *ifap;
534 *ifap = ifp;
535 }
536
537 /* On success it returns ifp with increased reference count */
538
539 static struct inet6_ifaddr *
540 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
541 int scope, u32 flags)
542 {
543 struct inet6_ifaddr *ifa = NULL;
544 struct rt6_info *rt;
545 int hash;
546 int err = 0;
547
548 rcu_read_lock_bh();
549 if (idev->dead) {
550 err = -ENODEV; /*XXX*/
551 goto out2;
552 }
553
554 write_lock(&addrconf_hash_lock);
555
556 /* Ignore adding duplicate addresses on an interface */
557 if (ipv6_chk_same_addr(addr, idev->dev)) {
558 ADBG(("ipv6_add_addr: already assigned\n"));
559 err = -EEXIST;
560 goto out;
561 }
562
563 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
564
565 if (ifa == NULL) {
566 ADBG(("ipv6_add_addr: malloc failed\n"));
567 err = -ENOBUFS;
568 goto out;
569 }
570
571 rt = addrconf_dst_alloc(idev, addr, 0);
572 if (IS_ERR(rt)) {
573 err = PTR_ERR(rt);
574 goto out;
575 }
576
577 ipv6_addr_copy(&ifa->addr, addr);
578
579 spin_lock_init(&ifa->lock);
580 init_timer(&ifa->timer);
581 ifa->timer.data = (unsigned long) ifa;
582 ifa->scope = scope;
583 ifa->prefix_len = pfxlen;
584 ifa->flags = flags | IFA_F_TENTATIVE;
585 ifa->cstamp = ifa->tstamp = jiffies;
586
587 ifa->rt = rt;
588
589 ifa->idev = idev;
590 in6_dev_hold(idev);
591 /* For caller */
592 in6_ifa_hold(ifa);
593
594 /* Add to big hash table */
595 hash = ipv6_addr_hash(addr);
596
597 ifa->lst_next = inet6_addr_lst[hash];
598 inet6_addr_lst[hash] = ifa;
599 in6_ifa_hold(ifa);
600 write_unlock(&addrconf_hash_lock);
601
602 write_lock(&idev->lock);
603 /* Add to inet6_dev unicast addr list. */
604 ipv6_link_dev_addr(idev, ifa);
605
606 #ifdef CONFIG_IPV6_PRIVACY
607 if (ifa->flags&IFA_F_TEMPORARY) {
608 ifa->tmp_next = idev->tempaddr_list;
609 idev->tempaddr_list = ifa;
610 in6_ifa_hold(ifa);
611 }
612 #endif
613
614 in6_ifa_hold(ifa);
615 write_unlock(&idev->lock);
616 out2:
617 rcu_read_unlock_bh();
618
619 if (likely(err == 0))
620 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
621 else {
622 kfree(ifa);
623 ifa = ERR_PTR(err);
624 }
625
626 return ifa;
627 out:
628 write_unlock(&addrconf_hash_lock);
629 goto out2;
630 }
631
632 /* This function wants to get referenced ifp and releases it before return */
633
634 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
635 {
636 struct inet6_ifaddr *ifa, **ifap;
637 struct inet6_dev *idev = ifp->idev;
638 int hash;
639 int deleted = 0, onlink = 0;
640 unsigned long expires = jiffies;
641
642 hash = ipv6_addr_hash(&ifp->addr);
643
644 ifp->dead = 1;
645
646 write_lock_bh(&addrconf_hash_lock);
647 for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
648 ifap = &ifa->lst_next) {
649 if (ifa == ifp) {
650 *ifap = ifa->lst_next;
651 __in6_ifa_put(ifp);
652 ifa->lst_next = NULL;
653 break;
654 }
655 }
656 write_unlock_bh(&addrconf_hash_lock);
657
658 write_lock_bh(&idev->lock);
659 #ifdef CONFIG_IPV6_PRIVACY
660 if (ifp->flags&IFA_F_TEMPORARY) {
661 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
662 ifap = &ifa->tmp_next) {
663 if (ifa == ifp) {
664 *ifap = ifa->tmp_next;
665 if (ifp->ifpub) {
666 in6_ifa_put(ifp->ifpub);
667 ifp->ifpub = NULL;
668 }
669 __in6_ifa_put(ifp);
670 ifa->tmp_next = NULL;
671 break;
672 }
673 }
674 }
675 #endif
676
677 for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
678 if (ifa == ifp) {
679 *ifap = ifa->if_next;
680 __in6_ifa_put(ifp);
681 ifa->if_next = NULL;
682 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
683 break;
684 deleted = 1;
685 continue;
686 } else if (ifp->flags & IFA_F_PERMANENT) {
687 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
688 ifp->prefix_len)) {
689 if (ifa->flags & IFA_F_PERMANENT) {
690 onlink = 1;
691 if (deleted)
692 break;
693 } else {
694 unsigned long lifetime;
695
696 if (!onlink)
697 onlink = -1;
698
699 spin_lock(&ifa->lock);
700 lifetime = min_t(unsigned long,
701 ifa->valid_lft, 0x7fffffffUL/HZ);
702 if (time_before(expires,
703 ifa->tstamp + lifetime * HZ))
704 expires = ifa->tstamp + lifetime * HZ;
705 spin_unlock(&ifa->lock);
706 }
707 }
708 }
709 ifap = &ifa->if_next;
710 }
711 write_unlock_bh(&idev->lock);
712
713 ipv6_ifa_notify(RTM_DELADDR, ifp);
714
715 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
716
717 addrconf_del_timer(ifp);
718
719 /*
720 * Purge or update corresponding prefix
721 *
722 * 1) we don't purge prefix here if address was not permanent.
723 * prefix is managed by its own lifetime.
724 * 2) if there're no addresses, delete prefix.
725 * 3) if there're still other permanent address(es),
726 * corresponding prefix is still permanent.
727 * 4) otherwise, update prefix lifetime to the
728 * longest valid lifetime among the corresponding
729 * addresses on the device.
730 * Note: subsequent RA will update lifetime.
731 *
732 * --yoshfuji
733 */
734 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
735 struct in6_addr prefix;
736 struct rt6_info *rt;
737
738 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
739 rt = rt6_lookup(&prefix, NULL, ifp->idev->dev->ifindex, 1);
740
741 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
742 if (onlink == 0) {
743 ip6_del_rt(rt);
744 rt = NULL;
745 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
746 rt->rt6i_expires = expires;
747 rt->rt6i_flags |= RTF_EXPIRES;
748 }
749 }
750 dst_release(&rt->u.dst);
751 }
752
753 in6_ifa_put(ifp);
754 }
755
756 #ifdef CONFIG_IPV6_PRIVACY
757 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
758 {
759 struct inet6_dev *idev = ifp->idev;
760 struct in6_addr addr, *tmpaddr;
761 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
762 int tmp_plen;
763 int ret = 0;
764 int max_addresses;
765
766 write_lock(&idev->lock);
767 if (ift) {
768 spin_lock_bh(&ift->lock);
769 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
770 spin_unlock_bh(&ift->lock);
771 tmpaddr = &addr;
772 } else {
773 tmpaddr = NULL;
774 }
775 retry:
776 in6_dev_hold(idev);
777 if (idev->cnf.use_tempaddr <= 0) {
778 write_unlock(&idev->lock);
779 printk(KERN_INFO
780 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
781 in6_dev_put(idev);
782 ret = -1;
783 goto out;
784 }
785 spin_lock_bh(&ifp->lock);
786 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
787 idev->cnf.use_tempaddr = -1; /*XXX*/
788 spin_unlock_bh(&ifp->lock);
789 write_unlock(&idev->lock);
790 printk(KERN_WARNING
791 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
792 in6_dev_put(idev);
793 ret = -1;
794 goto out;
795 }
796 in6_ifa_hold(ifp);
797 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
798 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
799 spin_unlock_bh(&ifp->lock);
800 write_unlock(&idev->lock);
801 printk(KERN_WARNING
802 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
803 in6_ifa_put(ifp);
804 in6_dev_put(idev);
805 ret = -1;
806 goto out;
807 }
808 memcpy(&addr.s6_addr[8], idev->rndid, 8);
809 tmp_valid_lft = min_t(__u32,
810 ifp->valid_lft,
811 idev->cnf.temp_valid_lft);
812 tmp_prefered_lft = min_t(__u32,
813 ifp->prefered_lft,
814 idev->cnf.temp_prefered_lft - desync_factor / HZ);
815 tmp_plen = ifp->prefix_len;
816 max_addresses = idev->cnf.max_addresses;
817 tmp_cstamp = ifp->cstamp;
818 tmp_tstamp = ifp->tstamp;
819 spin_unlock_bh(&ifp->lock);
820
821 write_unlock(&idev->lock);
822 ift = !max_addresses ||
823 ipv6_count_addresses(idev) < max_addresses ?
824 ipv6_add_addr(idev, &addr, tmp_plen,
825 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK, IFA_F_TEMPORARY) : NULL;
826 if (!ift || IS_ERR(ift)) {
827 in6_ifa_put(ifp);
828 in6_dev_put(idev);
829 printk(KERN_INFO
830 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
831 tmpaddr = &addr;
832 write_lock(&idev->lock);
833 goto retry;
834 }
835
836 spin_lock_bh(&ift->lock);
837 ift->ifpub = ifp;
838 ift->valid_lft = tmp_valid_lft;
839 ift->prefered_lft = tmp_prefered_lft;
840 ift->cstamp = tmp_cstamp;
841 ift->tstamp = tmp_tstamp;
842 spin_unlock_bh(&ift->lock);
843
844 addrconf_dad_start(ift, 0);
845 in6_ifa_put(ift);
846 in6_dev_put(idev);
847 out:
848 return ret;
849 }
850 #endif
851
852 /*
853 * Choose an appropriate source address (RFC3484)
854 */
855 struct ipv6_saddr_score {
856 int addr_type;
857 unsigned int attrs;
858 int matchlen;
859 int scope;
860 unsigned int rule;
861 };
862
863 #define IPV6_SADDR_SCORE_LOCAL 0x0001
864 #define IPV6_SADDR_SCORE_PREFERRED 0x0004
865 #define IPV6_SADDR_SCORE_HOA 0x0008
866 #define IPV6_SADDR_SCORE_OIF 0x0010
867 #define IPV6_SADDR_SCORE_LABEL 0x0020
868 #define IPV6_SADDR_SCORE_PRIVACY 0x0040
869
870 static int inline ipv6_saddr_preferred(int type)
871 {
872 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
873 IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
874 return 1;
875 return 0;
876 }
877
878 /* static matching label */
879 static int inline ipv6_saddr_label(const struct in6_addr *addr, int type)
880 {
881 /*
882 * prefix (longest match) label
883 * -----------------------------
884 * ::1/128 0
885 * ::/0 1
886 * 2002::/16 2
887 * ::/96 3
888 * ::ffff:0:0/96 4
889 * fc00::/7 5
890 * 2001::/32 6
891 */
892 if (type & IPV6_ADDR_LOOPBACK)
893 return 0;
894 else if (type & IPV6_ADDR_COMPATv4)
895 return 3;
896 else if (type & IPV6_ADDR_MAPPED)
897 return 4;
898 else if (addr->s6_addr32[0] == htonl(0x20010000))
899 return 6;
900 else if (addr->s6_addr16[0] == htons(0x2002))
901 return 2;
902 else if ((addr->s6_addr[0] & 0xfe) == 0xfc)
903 return 5;
904 return 1;
905 }
906
907 int ipv6_dev_get_saddr(struct net_device *daddr_dev,
908 struct in6_addr *daddr, struct in6_addr *saddr)
909 {
910 struct ipv6_saddr_score hiscore;
911 struct inet6_ifaddr *ifa_result = NULL;
912 int daddr_type = __ipv6_addr_type(daddr);
913 int daddr_scope = __ipv6_addr_src_scope(daddr_type);
914 u32 daddr_label = ipv6_saddr_label(daddr, daddr_type);
915 struct net_device *dev;
916
917 memset(&hiscore, 0, sizeof(hiscore));
918
919 read_lock(&dev_base_lock);
920 rcu_read_lock();
921
922 for (dev = dev_base; dev; dev=dev->next) {
923 struct inet6_dev *idev;
924 struct inet6_ifaddr *ifa;
925
926 /* Rule 0: Candidate Source Address (section 4)
927 * - multicast and link-local destination address,
928 * the set of candidate source address MUST only
929 * include addresses assigned to interfaces
930 * belonging to the same link as the outgoing
931 * interface.
932 * (- For site-local destination addresses, the
933 * set of candidate source addresses MUST only
934 * include addresses assigned to interfaces
935 * belonging to the same site as the outgoing
936 * interface.)
937 */
938 if ((daddr_type & IPV6_ADDR_MULTICAST ||
939 daddr_scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
940 daddr_dev && dev != daddr_dev)
941 continue;
942
943 idev = __in6_dev_get(dev);
944 if (!idev)
945 continue;
946
947 read_lock_bh(&idev->lock);
948 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
949 struct ipv6_saddr_score score;
950
951 score.addr_type = __ipv6_addr_type(&ifa->addr);
952
953 /* Rule 0:
954 * - Tentative Address (RFC2462 section 5.4)
955 * - A tentative address is not considered
956 * "assigned to an interface" in the traditional
957 * sense.
958 * - Candidate Source Address (section 4)
959 * - In any case, anycast addresses, multicast
960 * addresses, and the unspecified address MUST
961 * NOT be included in a candidate set.
962 */
963 if (ifa->flags & IFA_F_TENTATIVE)
964 continue;
965 if (unlikely(score.addr_type == IPV6_ADDR_ANY ||
966 score.addr_type & IPV6_ADDR_MULTICAST)) {
967 LIMIT_NETDEBUG(KERN_DEBUG
968 "ADDRCONF: unspecified / multicast address"
969 "assigned as unicast address on %s",
970 dev->name);
971 continue;
972 }
973
974 score.attrs = 0;
975 score.matchlen = 0;
976 score.scope = 0;
977 score.rule = 0;
978
979 if (ifa_result == NULL) {
980 /* record it if the first available entry */
981 goto record_it;
982 }
983
984 /* Rule 1: Prefer same address */
985 if (hiscore.rule < 1) {
986 if (ipv6_addr_equal(&ifa_result->addr, daddr))
987 hiscore.attrs |= IPV6_SADDR_SCORE_LOCAL;
988 hiscore.rule++;
989 }
990 if (ipv6_addr_equal(&ifa->addr, daddr)) {
991 score.attrs |= IPV6_SADDR_SCORE_LOCAL;
992 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)) {
993 score.rule = 1;
994 goto record_it;
995 }
996 } else {
997 if (hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)
998 continue;
999 }
1000
1001 /* Rule 2: Prefer appropriate scope */
1002 if (hiscore.rule < 2) {
1003 hiscore.scope = __ipv6_addr_src_scope(hiscore.addr_type);
1004 hiscore.rule++;
1005 }
1006 score.scope = __ipv6_addr_src_scope(score.addr_type);
1007 if (hiscore.scope < score.scope) {
1008 if (hiscore.scope < daddr_scope) {
1009 score.rule = 2;
1010 goto record_it;
1011 } else
1012 continue;
1013 } else if (score.scope < hiscore.scope) {
1014 if (score.scope < daddr_scope)
1015 break; /* addresses sorted by scope */
1016 else {
1017 score.rule = 2;
1018 goto record_it;
1019 }
1020 }
1021
1022 /* Rule 3: Avoid deprecated address */
1023 if (hiscore.rule < 3) {
1024 if (ipv6_saddr_preferred(hiscore.addr_type) ||
1025 !(ifa_result->flags & IFA_F_DEPRECATED))
1026 hiscore.attrs |= IPV6_SADDR_SCORE_PREFERRED;
1027 hiscore.rule++;
1028 }
1029 if (ipv6_saddr_preferred(score.addr_type) ||
1030 !(ifa->flags & IFA_F_DEPRECATED)) {
1031 score.attrs |= IPV6_SADDR_SCORE_PREFERRED;
1032 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)) {
1033 score.rule = 3;
1034 goto record_it;
1035 }
1036 } else {
1037 if (hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)
1038 continue;
1039 }
1040
1041 /* Rule 4: Prefer home address */
1042 #ifdef CONFIG_IPV6_MIP6
1043 if (hiscore.rule < 4) {
1044 if (ifa_result->flags & IFA_F_HOMEADDRESS)
1045 hiscore.attrs |= IPV6_SADDR_SCORE_HOA;
1046 hiscore.rule++;
1047 }
1048 if (ifa->flags & IFA_F_HOMEADDRESS) {
1049 score.attrs |= IPV6_SADDR_SCORE_HOA;
1050 if (!(ifa_result->flags & IFA_F_HOMEADDRESS)) {
1051 score.rule = 4;
1052 goto record_it;
1053 }
1054 } else {
1055 if (hiscore.attrs & IPV6_SADDR_SCORE_HOA)
1056 continue;
1057 }
1058 #else
1059 if (hiscore.rule < 4)
1060 hiscore.rule++;
1061 #endif
1062
1063 /* Rule 5: Prefer outgoing interface */
1064 if (hiscore.rule < 5) {
1065 if (daddr_dev == NULL ||
1066 daddr_dev == ifa_result->idev->dev)
1067 hiscore.attrs |= IPV6_SADDR_SCORE_OIF;
1068 hiscore.rule++;
1069 }
1070 if (daddr_dev == NULL ||
1071 daddr_dev == ifa->idev->dev) {
1072 score.attrs |= IPV6_SADDR_SCORE_OIF;
1073 if (!(hiscore.attrs & IPV6_SADDR_SCORE_OIF)) {
1074 score.rule = 5;
1075 goto record_it;
1076 }
1077 } else {
1078 if (hiscore.attrs & IPV6_SADDR_SCORE_OIF)
1079 continue;
1080 }
1081
1082 /* Rule 6: Prefer matching label */
1083 if (hiscore.rule < 6) {
1084 if (ipv6_saddr_label(&ifa_result->addr, hiscore.addr_type) == daddr_label)
1085 hiscore.attrs |= IPV6_SADDR_SCORE_LABEL;
1086 hiscore.rule++;
1087 }
1088 if (ipv6_saddr_label(&ifa->addr, score.addr_type) == daddr_label) {
1089 score.attrs |= IPV6_SADDR_SCORE_LABEL;
1090 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LABEL)) {
1091 score.rule = 6;
1092 goto record_it;
1093 }
1094 } else {
1095 if (hiscore.attrs & IPV6_SADDR_SCORE_LABEL)
1096 continue;
1097 }
1098
1099 #ifdef CONFIG_IPV6_PRIVACY
1100 /* Rule 7: Prefer public address
1101 * Note: prefer temprary address if use_tempaddr >= 2
1102 */
1103 if (hiscore.rule < 7) {
1104 if ((!(ifa_result->flags & IFA_F_TEMPORARY)) ^
1105 (ifa_result->idev->cnf.use_tempaddr >= 2))
1106 hiscore.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1107 hiscore.rule++;
1108 }
1109 if ((!(ifa->flags & IFA_F_TEMPORARY)) ^
1110 (ifa->idev->cnf.use_tempaddr >= 2)) {
1111 score.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1112 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)) {
1113 score.rule = 7;
1114 goto record_it;
1115 }
1116 } else {
1117 if (hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)
1118 continue;
1119 }
1120 #else
1121 if (hiscore.rule < 7)
1122 hiscore.rule++;
1123 #endif
1124 /* Rule 8: Use longest matching prefix */
1125 if (hiscore.rule < 8) {
1126 hiscore.matchlen = ipv6_addr_diff(&ifa_result->addr, daddr);
1127 hiscore.rule++;
1128 }
1129 score.matchlen = ipv6_addr_diff(&ifa->addr, daddr);
1130 if (score.matchlen > hiscore.matchlen) {
1131 score.rule = 8;
1132 goto record_it;
1133 }
1134 #if 0
1135 else if (score.matchlen < hiscore.matchlen)
1136 continue;
1137 #endif
1138
1139 /* Final Rule: choose first available one */
1140 continue;
1141 record_it:
1142 if (ifa_result)
1143 in6_ifa_put(ifa_result);
1144 in6_ifa_hold(ifa);
1145 ifa_result = ifa;
1146 hiscore = score;
1147 }
1148 read_unlock_bh(&idev->lock);
1149 }
1150 rcu_read_unlock();
1151 read_unlock(&dev_base_lock);
1152
1153 if (!ifa_result)
1154 return -EADDRNOTAVAIL;
1155
1156 ipv6_addr_copy(saddr, &ifa_result->addr);
1157 in6_ifa_put(ifa_result);
1158 return 0;
1159 }
1160
1161
1162 int ipv6_get_saddr(struct dst_entry *dst,
1163 struct in6_addr *daddr, struct in6_addr *saddr)
1164 {
1165 return ipv6_dev_get_saddr(dst ? ((struct rt6_info *)dst)->rt6i_idev->dev : NULL, daddr, saddr);
1166 }
1167
1168
1169 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr)
1170 {
1171 struct inet6_dev *idev;
1172 int err = -EADDRNOTAVAIL;
1173
1174 rcu_read_lock();
1175 if ((idev = __in6_dev_get(dev)) != NULL) {
1176 struct inet6_ifaddr *ifp;
1177
1178 read_lock_bh(&idev->lock);
1179 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1180 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1181 ipv6_addr_copy(addr, &ifp->addr);
1182 err = 0;
1183 break;
1184 }
1185 }
1186 read_unlock_bh(&idev->lock);
1187 }
1188 rcu_read_unlock();
1189 return err;
1190 }
1191
1192 static int ipv6_count_addresses(struct inet6_dev *idev)
1193 {
1194 int cnt = 0;
1195 struct inet6_ifaddr *ifp;
1196
1197 read_lock_bh(&idev->lock);
1198 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1199 cnt++;
1200 read_unlock_bh(&idev->lock);
1201 return cnt;
1202 }
1203
1204 int ipv6_chk_addr(struct in6_addr *addr, struct net_device *dev, int strict)
1205 {
1206 struct inet6_ifaddr * ifp;
1207 u8 hash = ipv6_addr_hash(addr);
1208
1209 read_lock_bh(&addrconf_hash_lock);
1210 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1211 if (ipv6_addr_equal(&ifp->addr, addr) &&
1212 !(ifp->flags&IFA_F_TENTATIVE)) {
1213 if (dev == NULL || ifp->idev->dev == dev ||
1214 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1215 break;
1216 }
1217 }
1218 read_unlock_bh(&addrconf_hash_lock);
1219 return ifp != NULL;
1220 }
1221
1222 static
1223 int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev)
1224 {
1225 struct inet6_ifaddr * ifp;
1226 u8 hash = ipv6_addr_hash(addr);
1227
1228 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1229 if (ipv6_addr_equal(&ifp->addr, addr)) {
1230 if (dev == NULL || ifp->idev->dev == dev)
1231 break;
1232 }
1233 }
1234 return ifp != NULL;
1235 }
1236
1237 struct inet6_ifaddr * ipv6_get_ifaddr(struct in6_addr *addr, struct net_device *dev, int strict)
1238 {
1239 struct inet6_ifaddr * ifp;
1240 u8 hash = ipv6_addr_hash(addr);
1241
1242 read_lock_bh(&addrconf_hash_lock);
1243 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1244 if (ipv6_addr_equal(&ifp->addr, addr)) {
1245 if (dev == NULL || ifp->idev->dev == dev ||
1246 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1247 in6_ifa_hold(ifp);
1248 break;
1249 }
1250 }
1251 }
1252 read_unlock_bh(&addrconf_hash_lock);
1253
1254 return ifp;
1255 }
1256
1257 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1258 {
1259 const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
1260 const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
1261 __be32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
1262 __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1263 int sk_ipv6only = ipv6_only_sock(sk);
1264 int sk2_ipv6only = inet_v6_ipv6only(sk2);
1265 int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1266 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1267
1268 if (!sk2_rcv_saddr && !sk_ipv6only)
1269 return 1;
1270
1271 if (addr_type2 == IPV6_ADDR_ANY &&
1272 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1273 return 1;
1274
1275 if (addr_type == IPV6_ADDR_ANY &&
1276 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1277 return 1;
1278
1279 if (sk2_rcv_saddr6 &&
1280 ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1281 return 1;
1282
1283 if (addr_type == IPV6_ADDR_MAPPED &&
1284 !sk2_ipv6only &&
1285 (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1286 return 1;
1287
1288 return 0;
1289 }
1290
1291 /* Gets referenced address, destroys ifaddr */
1292
1293 static void addrconf_dad_stop(struct inet6_ifaddr *ifp)
1294 {
1295 if (ifp->flags&IFA_F_PERMANENT) {
1296 spin_lock_bh(&ifp->lock);
1297 addrconf_del_timer(ifp);
1298 ifp->flags |= IFA_F_TENTATIVE;
1299 spin_unlock_bh(&ifp->lock);
1300 in6_ifa_put(ifp);
1301 #ifdef CONFIG_IPV6_PRIVACY
1302 } else if (ifp->flags&IFA_F_TEMPORARY) {
1303 struct inet6_ifaddr *ifpub;
1304 spin_lock_bh(&ifp->lock);
1305 ifpub = ifp->ifpub;
1306 if (ifpub) {
1307 in6_ifa_hold(ifpub);
1308 spin_unlock_bh(&ifp->lock);
1309 ipv6_create_tempaddr(ifpub, ifp);
1310 in6_ifa_put(ifpub);
1311 } else {
1312 spin_unlock_bh(&ifp->lock);
1313 }
1314 ipv6_del_addr(ifp);
1315 #endif
1316 } else
1317 ipv6_del_addr(ifp);
1318 }
1319
1320 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1321 {
1322 if (net_ratelimit())
1323 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1324 addrconf_dad_stop(ifp);
1325 }
1326
1327 /* Join to solicited addr multicast group. */
1328
1329 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1330 {
1331 struct in6_addr maddr;
1332
1333 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1334 return;
1335
1336 addrconf_addr_solict_mult(addr, &maddr);
1337 ipv6_dev_mc_inc(dev, &maddr);
1338 }
1339
1340 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1341 {
1342 struct in6_addr maddr;
1343
1344 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1345 return;
1346
1347 addrconf_addr_solict_mult(addr, &maddr);
1348 __ipv6_dev_mc_dec(idev, &maddr);
1349 }
1350
1351 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1352 {
1353 struct in6_addr addr;
1354 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1355 if (ipv6_addr_any(&addr))
1356 return;
1357 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1358 }
1359
1360 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1361 {
1362 struct in6_addr addr;
1363 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1364 if (ipv6_addr_any(&addr))
1365 return;
1366 __ipv6_dev_ac_dec(ifp->idev, &addr);
1367 }
1368
1369 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1370 {
1371 if (dev->addr_len != ETH_ALEN)
1372 return -1;
1373 memcpy(eui, dev->dev_addr, 3);
1374 memcpy(eui + 5, dev->dev_addr + 3, 3);
1375
1376 /*
1377 * The zSeries OSA network cards can be shared among various
1378 * OS instances, but the OSA cards have only one MAC address.
1379 * This leads to duplicate address conflicts in conjunction
1380 * with IPv6 if more than one instance uses the same card.
1381 *
1382 * The driver for these cards can deliver a unique 16-bit
1383 * identifier for each instance sharing the same card. It is
1384 * placed instead of 0xFFFE in the interface identifier. The
1385 * "u" bit of the interface identifier is not inverted in this
1386 * case. Hence the resulting interface identifier has local
1387 * scope according to RFC2373.
1388 */
1389 if (dev->dev_id) {
1390 eui[3] = (dev->dev_id >> 8) & 0xFF;
1391 eui[4] = dev->dev_id & 0xFF;
1392 } else {
1393 eui[3] = 0xFF;
1394 eui[4] = 0xFE;
1395 eui[0] ^= 2;
1396 }
1397 return 0;
1398 }
1399
1400 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1401 {
1402 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1403 if (dev->addr_len != ARCNET_ALEN)
1404 return -1;
1405 memset(eui, 0, 7);
1406 eui[7] = *(u8*)dev->dev_addr;
1407 return 0;
1408 }
1409
1410 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1411 {
1412 if (dev->addr_len != INFINIBAND_ALEN)
1413 return -1;
1414 memcpy(eui, dev->dev_addr + 12, 8);
1415 eui[0] |= 2;
1416 return 0;
1417 }
1418
1419 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1420 {
1421 switch (dev->type) {
1422 case ARPHRD_ETHER:
1423 case ARPHRD_FDDI:
1424 case ARPHRD_IEEE802_TR:
1425 return addrconf_ifid_eui48(eui, dev);
1426 case ARPHRD_ARCNET:
1427 return addrconf_ifid_arcnet(eui, dev);
1428 case ARPHRD_INFINIBAND:
1429 return addrconf_ifid_infiniband(eui, dev);
1430 }
1431 return -1;
1432 }
1433
1434 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1435 {
1436 int err = -1;
1437 struct inet6_ifaddr *ifp;
1438
1439 read_lock_bh(&idev->lock);
1440 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1441 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1442 memcpy(eui, ifp->addr.s6_addr+8, 8);
1443 err = 0;
1444 break;
1445 }
1446 }
1447 read_unlock_bh(&idev->lock);
1448 return err;
1449 }
1450
1451 #ifdef CONFIG_IPV6_PRIVACY
1452 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1453 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1454 {
1455 regen:
1456 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1457 idev->rndid[0] &= ~0x02;
1458
1459 /*
1460 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1461 * check if generated address is not inappropriate
1462 *
1463 * - Reserved subnet anycast (RFC 2526)
1464 * 11111101 11....11 1xxxxxxx
1465 * - ISATAP (draft-ietf-ngtrans-isatap-13.txt) 5.1
1466 * 00-00-5E-FE-xx-xx-xx-xx
1467 * - value 0
1468 * - XXX: already assigned to an address on the device
1469 */
1470 if (idev->rndid[0] == 0xfd &&
1471 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1472 (idev->rndid[7]&0x80))
1473 goto regen;
1474 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1475 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1476 goto regen;
1477 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1478 goto regen;
1479 }
1480
1481 return 0;
1482 }
1483
1484 static void ipv6_regen_rndid(unsigned long data)
1485 {
1486 struct inet6_dev *idev = (struct inet6_dev *) data;
1487 unsigned long expires;
1488
1489 rcu_read_lock_bh();
1490 write_lock_bh(&idev->lock);
1491
1492 if (idev->dead)
1493 goto out;
1494
1495 if (__ipv6_regen_rndid(idev) < 0)
1496 goto out;
1497
1498 expires = jiffies +
1499 idev->cnf.temp_prefered_lft * HZ -
1500 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1501 if (time_before(expires, jiffies)) {
1502 printk(KERN_WARNING
1503 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1504 idev->dev->name);
1505 goto out;
1506 }
1507
1508 if (!mod_timer(&idev->regen_timer, expires))
1509 in6_dev_hold(idev);
1510
1511 out:
1512 write_unlock_bh(&idev->lock);
1513 rcu_read_unlock_bh();
1514 in6_dev_put(idev);
1515 }
1516
1517 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1518 int ret = 0;
1519
1520 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1521 ret = __ipv6_regen_rndid(idev);
1522 return ret;
1523 }
1524 #endif
1525
1526 /*
1527 * Add prefix route.
1528 */
1529
1530 static void
1531 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1532 unsigned long expires, u32 flags)
1533 {
1534 struct fib6_config cfg = {
1535 .fc_table = RT6_TABLE_PREFIX,
1536 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1537 .fc_ifindex = dev->ifindex,
1538 .fc_expires = expires,
1539 .fc_dst_len = plen,
1540 .fc_flags = RTF_UP | flags,
1541 };
1542
1543 ipv6_addr_copy(&cfg.fc_dst, pfx);
1544
1545 /* Prevent useless cloning on PtP SIT.
1546 This thing is done here expecting that the whole
1547 class of non-broadcast devices need not cloning.
1548 */
1549 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1550 cfg.fc_flags |= RTF_NONEXTHOP;
1551
1552 ip6_route_add(&cfg);
1553 }
1554
1555 /* Create "default" multicast route to the interface */
1556
1557 static void addrconf_add_mroute(struct net_device *dev)
1558 {
1559 struct fib6_config cfg = {
1560 .fc_table = RT6_TABLE_LOCAL,
1561 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1562 .fc_ifindex = dev->ifindex,
1563 .fc_dst_len = 8,
1564 .fc_flags = RTF_UP,
1565 };
1566
1567 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1568
1569 ip6_route_add(&cfg);
1570 }
1571
1572 static void sit_route_add(struct net_device *dev)
1573 {
1574 struct fib6_config cfg = {
1575 .fc_table = RT6_TABLE_MAIN,
1576 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1577 .fc_ifindex = dev->ifindex,
1578 .fc_dst_len = 96,
1579 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1580 };
1581
1582 /* prefix length - 96 bits "::d.d.d.d" */
1583 ip6_route_add(&cfg);
1584 }
1585
1586 static void addrconf_add_lroute(struct net_device *dev)
1587 {
1588 struct in6_addr addr;
1589
1590 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1591 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1592 }
1593
1594 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1595 {
1596 struct inet6_dev *idev;
1597
1598 ASSERT_RTNL();
1599
1600 if ((idev = ipv6_find_idev(dev)) == NULL)
1601 return NULL;
1602
1603 /* Add default multicast route */
1604 addrconf_add_mroute(dev);
1605
1606 /* Add link local route */
1607 addrconf_add_lroute(dev);
1608 return idev;
1609 }
1610
1611 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1612 {
1613 struct prefix_info *pinfo;
1614 __u32 valid_lft;
1615 __u32 prefered_lft;
1616 int addr_type;
1617 unsigned long rt_expires;
1618 struct inet6_dev *in6_dev;
1619
1620 pinfo = (struct prefix_info *) opt;
1621
1622 if (len < sizeof(struct prefix_info)) {
1623 ADBG(("addrconf: prefix option too short\n"));
1624 return;
1625 }
1626
1627 /*
1628 * Validation checks ([ADDRCONF], page 19)
1629 */
1630
1631 addr_type = ipv6_addr_type(&pinfo->prefix);
1632
1633 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1634 return;
1635
1636 valid_lft = ntohl(pinfo->valid);
1637 prefered_lft = ntohl(pinfo->prefered);
1638
1639 if (prefered_lft > valid_lft) {
1640 if (net_ratelimit())
1641 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1642 return;
1643 }
1644
1645 in6_dev = in6_dev_get(dev);
1646
1647 if (in6_dev == NULL) {
1648 if (net_ratelimit())
1649 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1650 return;
1651 }
1652
1653 /*
1654 * Two things going on here:
1655 * 1) Add routes for on-link prefixes
1656 * 2) Configure prefixes with the auto flag set
1657 */
1658
1659 /* Avoid arithmetic overflow. Really, we could
1660 save rt_expires in seconds, likely valid_lft,
1661 but it would require division in fib gc, that it
1662 not good.
1663 */
1664 if (valid_lft >= 0x7FFFFFFF/HZ)
1665 rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ);
1666 else
1667 rt_expires = valid_lft * HZ;
1668
1669 /*
1670 * We convert this (in jiffies) to clock_t later.
1671 * Avoid arithmetic overflow there as well.
1672 * Overflow can happen only if HZ < USER_HZ.
1673 */
1674 if (HZ < USER_HZ && rt_expires > 0x7FFFFFFF / USER_HZ)
1675 rt_expires = 0x7FFFFFFF / USER_HZ;
1676
1677 if (pinfo->onlink) {
1678 struct rt6_info *rt;
1679 rt = rt6_lookup(&pinfo->prefix, NULL, dev->ifindex, 1);
1680
1681 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
1682 if (rt->rt6i_flags&RTF_EXPIRES) {
1683 if (valid_lft == 0) {
1684 ip6_del_rt(rt);
1685 rt = NULL;
1686 } else {
1687 rt->rt6i_expires = jiffies + rt_expires;
1688 }
1689 }
1690 } else if (valid_lft) {
1691 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1692 dev, jiffies_to_clock_t(rt_expires), RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT);
1693 }
1694 if (rt)
1695 dst_release(&rt->u.dst);
1696 }
1697
1698 /* Try to figure out our local address for this prefix */
1699
1700 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1701 struct inet6_ifaddr * ifp;
1702 struct in6_addr addr;
1703 int create = 0, update_lft = 0;
1704
1705 if (pinfo->prefix_len == 64) {
1706 memcpy(&addr, &pinfo->prefix, 8);
1707 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1708 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1709 in6_dev_put(in6_dev);
1710 return;
1711 }
1712 goto ok;
1713 }
1714 if (net_ratelimit())
1715 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1716 pinfo->prefix_len);
1717 in6_dev_put(in6_dev);
1718 return;
1719
1720 ok:
1721
1722 ifp = ipv6_get_ifaddr(&addr, dev, 1);
1723
1724 if (ifp == NULL && valid_lft) {
1725 int max_addresses = in6_dev->cnf.max_addresses;
1726
1727 /* Do not allow to create too much of autoconfigured
1728 * addresses; this would be too easy way to crash kernel.
1729 */
1730 if (!max_addresses ||
1731 ipv6_count_addresses(in6_dev) < max_addresses)
1732 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1733 addr_type&IPV6_ADDR_SCOPE_MASK, 0);
1734
1735 if (!ifp || IS_ERR(ifp)) {
1736 in6_dev_put(in6_dev);
1737 return;
1738 }
1739
1740 update_lft = create = 1;
1741 ifp->cstamp = jiffies;
1742 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1743 }
1744
1745 if (ifp) {
1746 int flags;
1747 unsigned long now;
1748 #ifdef CONFIG_IPV6_PRIVACY
1749 struct inet6_ifaddr *ift;
1750 #endif
1751 u32 stored_lft;
1752
1753 /* update lifetime (RFC2462 5.5.3 e) */
1754 spin_lock(&ifp->lock);
1755 now = jiffies;
1756 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1757 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1758 else
1759 stored_lft = 0;
1760 if (!update_lft && stored_lft) {
1761 if (valid_lft > MIN_VALID_LIFETIME ||
1762 valid_lft > stored_lft)
1763 update_lft = 1;
1764 else if (stored_lft <= MIN_VALID_LIFETIME) {
1765 /* valid_lft <= stored_lft is always true */
1766 /* XXX: IPsec */
1767 update_lft = 0;
1768 } else {
1769 valid_lft = MIN_VALID_LIFETIME;
1770 if (valid_lft < prefered_lft)
1771 prefered_lft = valid_lft;
1772 update_lft = 1;
1773 }
1774 }
1775
1776 if (update_lft) {
1777 ifp->valid_lft = valid_lft;
1778 ifp->prefered_lft = prefered_lft;
1779 ifp->tstamp = now;
1780 flags = ifp->flags;
1781 ifp->flags &= ~IFA_F_DEPRECATED;
1782 spin_unlock(&ifp->lock);
1783
1784 if (!(flags&IFA_F_TENTATIVE))
1785 ipv6_ifa_notify(0, ifp);
1786 } else
1787 spin_unlock(&ifp->lock);
1788
1789 #ifdef CONFIG_IPV6_PRIVACY
1790 read_lock_bh(&in6_dev->lock);
1791 /* update all temporary addresses in the list */
1792 for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1793 /*
1794 * When adjusting the lifetimes of an existing
1795 * temporary address, only lower the lifetimes.
1796 * Implementations must not increase the
1797 * lifetimes of an existing temporary address
1798 * when processing a Prefix Information Option.
1799 */
1800 spin_lock(&ift->lock);
1801 flags = ift->flags;
1802 if (ift->valid_lft > valid_lft &&
1803 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1804 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1805 if (ift->prefered_lft > prefered_lft &&
1806 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1807 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1808 spin_unlock(&ift->lock);
1809 if (!(flags&IFA_F_TENTATIVE))
1810 ipv6_ifa_notify(0, ift);
1811 }
1812
1813 if (create && in6_dev->cnf.use_tempaddr > 0) {
1814 /*
1815 * When a new public address is created as described in [ADDRCONF],
1816 * also create a new temporary address.
1817 */
1818 read_unlock_bh(&in6_dev->lock);
1819 ipv6_create_tempaddr(ifp, NULL);
1820 } else {
1821 read_unlock_bh(&in6_dev->lock);
1822 }
1823 #endif
1824 in6_ifa_put(ifp);
1825 addrconf_verify(0);
1826 }
1827 }
1828 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
1829 in6_dev_put(in6_dev);
1830 }
1831
1832 /*
1833 * Set destination address.
1834 * Special case for SIT interfaces where we create a new "virtual"
1835 * device.
1836 */
1837 int addrconf_set_dstaddr(void __user *arg)
1838 {
1839 struct in6_ifreq ireq;
1840 struct net_device *dev;
1841 int err = -EINVAL;
1842
1843 rtnl_lock();
1844
1845 err = -EFAULT;
1846 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1847 goto err_exit;
1848
1849 dev = __dev_get_by_index(ireq.ifr6_ifindex);
1850
1851 err = -ENODEV;
1852 if (dev == NULL)
1853 goto err_exit;
1854
1855 if (dev->type == ARPHRD_SIT) {
1856 struct ifreq ifr;
1857 mm_segment_t oldfs;
1858 struct ip_tunnel_parm p;
1859
1860 err = -EADDRNOTAVAIL;
1861 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
1862 goto err_exit;
1863
1864 memset(&p, 0, sizeof(p));
1865 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
1866 p.iph.saddr = 0;
1867 p.iph.version = 4;
1868 p.iph.ihl = 5;
1869 p.iph.protocol = IPPROTO_IPV6;
1870 p.iph.ttl = 64;
1871 ifr.ifr_ifru.ifru_data = (void __user *)&p;
1872
1873 oldfs = get_fs(); set_fs(KERNEL_DS);
1874 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
1875 set_fs(oldfs);
1876
1877 if (err == 0) {
1878 err = -ENOBUFS;
1879 if ((dev = __dev_get_by_name(p.name)) == NULL)
1880 goto err_exit;
1881 err = dev_open(dev);
1882 }
1883 }
1884
1885 err_exit:
1886 rtnl_unlock();
1887 return err;
1888 }
1889
1890 /*
1891 * Manual configuration of address on an interface
1892 */
1893 static int inet6_addr_add(int ifindex, struct in6_addr *pfx, int plen,
1894 __u8 ifa_flags, __u32 prefered_lft, __u32 valid_lft)
1895 {
1896 struct inet6_ifaddr *ifp;
1897 struct inet6_dev *idev;
1898 struct net_device *dev;
1899 int scope;
1900
1901 ASSERT_RTNL();
1902
1903 /* check the lifetime */
1904 if (!valid_lft || prefered_lft > valid_lft)
1905 return -EINVAL;
1906
1907 if ((dev = __dev_get_by_index(ifindex)) == NULL)
1908 return -ENODEV;
1909
1910 if ((idev = addrconf_add_dev(dev)) == NULL)
1911 return -ENOBUFS;
1912
1913 scope = ipv6_addr_scope(pfx);
1914
1915 if (valid_lft == INFINITY_LIFE_TIME)
1916 ifa_flags |= IFA_F_PERMANENT;
1917 else if (valid_lft >= 0x7FFFFFFF/HZ)
1918 valid_lft = 0x7FFFFFFF/HZ;
1919
1920 if (prefered_lft == 0)
1921 ifa_flags |= IFA_F_DEPRECATED;
1922 else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
1923 (prefered_lft != INFINITY_LIFE_TIME))
1924 prefered_lft = 0x7FFFFFFF/HZ;
1925
1926 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
1927
1928 if (!IS_ERR(ifp)) {
1929 spin_lock_bh(&ifp->lock);
1930 ifp->valid_lft = valid_lft;
1931 ifp->prefered_lft = prefered_lft;
1932 ifp->tstamp = jiffies;
1933 spin_unlock_bh(&ifp->lock);
1934
1935 addrconf_dad_start(ifp, 0);
1936 in6_ifa_put(ifp);
1937 addrconf_verify(0);
1938 return 0;
1939 }
1940
1941 return PTR_ERR(ifp);
1942 }
1943
1944 static int inet6_addr_del(int ifindex, struct in6_addr *pfx, int plen)
1945 {
1946 struct inet6_ifaddr *ifp;
1947 struct inet6_dev *idev;
1948 struct net_device *dev;
1949
1950 if ((dev = __dev_get_by_index(ifindex)) == NULL)
1951 return -ENODEV;
1952
1953 if ((idev = __in6_dev_get(dev)) == NULL)
1954 return -ENXIO;
1955
1956 read_lock_bh(&idev->lock);
1957 for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
1958 if (ifp->prefix_len == plen &&
1959 ipv6_addr_equal(pfx, &ifp->addr)) {
1960 in6_ifa_hold(ifp);
1961 read_unlock_bh(&idev->lock);
1962
1963 ipv6_del_addr(ifp);
1964
1965 /* If the last address is deleted administratively,
1966 disable IPv6 on this interface.
1967 */
1968 if (idev->addr_list == NULL)
1969 addrconf_ifdown(idev->dev, 1);
1970 return 0;
1971 }
1972 }
1973 read_unlock_bh(&idev->lock);
1974 return -EADDRNOTAVAIL;
1975 }
1976
1977
1978 int addrconf_add_ifaddr(void __user *arg)
1979 {
1980 struct in6_ifreq ireq;
1981 int err;
1982
1983 if (!capable(CAP_NET_ADMIN))
1984 return -EPERM;
1985
1986 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1987 return -EFAULT;
1988
1989 rtnl_lock();
1990 err = inet6_addr_add(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen,
1991 IFA_F_PERMANENT, INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1992 rtnl_unlock();
1993 return err;
1994 }
1995
1996 int addrconf_del_ifaddr(void __user *arg)
1997 {
1998 struct in6_ifreq ireq;
1999 int err;
2000
2001 if (!capable(CAP_NET_ADMIN))
2002 return -EPERM;
2003
2004 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2005 return -EFAULT;
2006
2007 rtnl_lock();
2008 err = inet6_addr_del(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
2009 rtnl_unlock();
2010 return err;
2011 }
2012
2013 static void sit_add_v4_addrs(struct inet6_dev *idev)
2014 {
2015 struct inet6_ifaddr * ifp;
2016 struct in6_addr addr;
2017 struct net_device *dev;
2018 int scope;
2019
2020 ASSERT_RTNL();
2021
2022 memset(&addr, 0, sizeof(struct in6_addr));
2023 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2024
2025 if (idev->dev->flags&IFF_POINTOPOINT) {
2026 addr.s6_addr32[0] = htonl(0xfe800000);
2027 scope = IFA_LINK;
2028 } else {
2029 scope = IPV6_ADDR_COMPATv4;
2030 }
2031
2032 if (addr.s6_addr32[3]) {
2033 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
2034 if (!IS_ERR(ifp)) {
2035 spin_lock_bh(&ifp->lock);
2036 ifp->flags &= ~IFA_F_TENTATIVE;
2037 spin_unlock_bh(&ifp->lock);
2038 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2039 in6_ifa_put(ifp);
2040 }
2041 return;
2042 }
2043
2044 for (dev = dev_base; dev != NULL; dev = dev->next) {
2045 struct in_device * in_dev = __in_dev_get_rtnl(dev);
2046 if (in_dev && (dev->flags & IFF_UP)) {
2047 struct in_ifaddr * ifa;
2048
2049 int flag = scope;
2050
2051 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2052 int plen;
2053
2054 addr.s6_addr32[3] = ifa->ifa_local;
2055
2056 if (ifa->ifa_scope == RT_SCOPE_LINK)
2057 continue;
2058 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2059 if (idev->dev->flags&IFF_POINTOPOINT)
2060 continue;
2061 flag |= IFA_HOST;
2062 }
2063 if (idev->dev->flags&IFF_POINTOPOINT)
2064 plen = 64;
2065 else
2066 plen = 96;
2067
2068 ifp = ipv6_add_addr(idev, &addr, plen, flag,
2069 IFA_F_PERMANENT);
2070 if (!IS_ERR(ifp)) {
2071 spin_lock_bh(&ifp->lock);
2072 ifp->flags &= ~IFA_F_TENTATIVE;
2073 spin_unlock_bh(&ifp->lock);
2074 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2075 in6_ifa_put(ifp);
2076 }
2077 }
2078 }
2079 }
2080 }
2081
2082 static void init_loopback(struct net_device *dev)
2083 {
2084 struct inet6_dev *idev;
2085 struct inet6_ifaddr * ifp;
2086
2087 /* ::1 */
2088
2089 ASSERT_RTNL();
2090
2091 if ((idev = ipv6_find_idev(dev)) == NULL) {
2092 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2093 return;
2094 }
2095
2096 ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
2097 if (!IS_ERR(ifp)) {
2098 spin_lock_bh(&ifp->lock);
2099 ifp->flags &= ~IFA_F_TENTATIVE;
2100 spin_unlock_bh(&ifp->lock);
2101 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2102 in6_ifa_put(ifp);
2103 }
2104 }
2105
2106 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2107 {
2108 struct inet6_ifaddr * ifp;
2109
2110 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, IFA_F_PERMANENT);
2111 if (!IS_ERR(ifp)) {
2112 addrconf_dad_start(ifp, 0);
2113 in6_ifa_put(ifp);
2114 }
2115 }
2116
2117 static void addrconf_dev_config(struct net_device *dev)
2118 {
2119 struct in6_addr addr;
2120 struct inet6_dev * idev;
2121
2122 ASSERT_RTNL();
2123
2124 if ((dev->type != ARPHRD_ETHER) &&
2125 (dev->type != ARPHRD_FDDI) &&
2126 (dev->type != ARPHRD_IEEE802_TR) &&
2127 (dev->type != ARPHRD_ARCNET) &&
2128 (dev->type != ARPHRD_INFINIBAND)) {
2129 /* Alas, we support only Ethernet autoconfiguration. */
2130 return;
2131 }
2132
2133 idev = addrconf_add_dev(dev);
2134 if (idev == NULL)
2135 return;
2136
2137 memset(&addr, 0, sizeof(struct in6_addr));
2138 addr.s6_addr32[0] = htonl(0xFE800000);
2139
2140 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2141 addrconf_add_linklocal(idev, &addr);
2142 }
2143
2144 static void addrconf_sit_config(struct net_device *dev)
2145 {
2146 struct inet6_dev *idev;
2147
2148 ASSERT_RTNL();
2149
2150 /*
2151 * Configure the tunnel with one of our IPv4
2152 * addresses... we should configure all of
2153 * our v4 addrs in the tunnel
2154 */
2155
2156 if ((idev = ipv6_find_idev(dev)) == NULL) {
2157 printk(KERN_DEBUG "init sit: add_dev failed\n");
2158 return;
2159 }
2160
2161 sit_add_v4_addrs(idev);
2162
2163 if (dev->flags&IFF_POINTOPOINT) {
2164 addrconf_add_mroute(dev);
2165 addrconf_add_lroute(dev);
2166 } else
2167 sit_route_add(dev);
2168 }
2169
2170 static inline int
2171 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2172 {
2173 struct in6_addr lladdr;
2174
2175 if (!ipv6_get_lladdr(link_dev, &lladdr)) {
2176 addrconf_add_linklocal(idev, &lladdr);
2177 return 0;
2178 }
2179 return -1;
2180 }
2181
2182 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2183 {
2184 struct net_device *link_dev;
2185
2186 /* first try to inherit the link-local address from the link device */
2187 if (idev->dev->iflink &&
2188 (link_dev = __dev_get_by_index(idev->dev->iflink))) {
2189 if (!ipv6_inherit_linklocal(idev, link_dev))
2190 return;
2191 }
2192 /* then try to inherit it from any device */
2193 for (link_dev = dev_base; link_dev; link_dev = link_dev->next) {
2194 if (!ipv6_inherit_linklocal(idev, link_dev))
2195 return;
2196 }
2197 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2198 }
2199
2200 /*
2201 * Autoconfigure tunnel with a link-local address so routing protocols,
2202 * DHCPv6, MLD etc. can be run over the virtual link
2203 */
2204
2205 static void addrconf_ip6_tnl_config(struct net_device *dev)
2206 {
2207 struct inet6_dev *idev;
2208
2209 ASSERT_RTNL();
2210
2211 if ((idev = addrconf_add_dev(dev)) == NULL) {
2212 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2213 return;
2214 }
2215 ip6_tnl_add_linklocal(idev);
2216 }
2217
2218 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2219 void * data)
2220 {
2221 struct net_device *dev = (struct net_device *) data;
2222 struct inet6_dev *idev = __in6_dev_get(dev);
2223 int run_pending = 0;
2224
2225 switch(event) {
2226 case NETDEV_UP:
2227 case NETDEV_CHANGE:
2228 if (event == NETDEV_UP) {
2229 if (!netif_carrier_ok(dev)) {
2230 /* device is not ready yet. */
2231 printk(KERN_INFO
2232 "ADDRCONF(NETDEV_UP): %s: "
2233 "link is not ready\n",
2234 dev->name);
2235 break;
2236 }
2237
2238 if (idev)
2239 idev->if_flags |= IF_READY;
2240 } else {
2241 if (!netif_carrier_ok(dev)) {
2242 /* device is still not ready. */
2243 break;
2244 }
2245
2246 if (idev) {
2247 if (idev->if_flags & IF_READY) {
2248 /* device is already configured. */
2249 break;
2250 }
2251 idev->if_flags |= IF_READY;
2252 }
2253
2254 printk(KERN_INFO
2255 "ADDRCONF(NETDEV_CHANGE): %s: "
2256 "link becomes ready\n",
2257 dev->name);
2258
2259 run_pending = 1;
2260 }
2261
2262 switch(dev->type) {
2263 case ARPHRD_SIT:
2264 addrconf_sit_config(dev);
2265 break;
2266 case ARPHRD_TUNNEL6:
2267 addrconf_ip6_tnl_config(dev);
2268 break;
2269 case ARPHRD_LOOPBACK:
2270 init_loopback(dev);
2271 break;
2272
2273 default:
2274 addrconf_dev_config(dev);
2275 break;
2276 };
2277 if (idev) {
2278 if (run_pending)
2279 addrconf_dad_run(idev);
2280
2281 /* If the MTU changed during the interface down, when the
2282 interface up, the changed MTU must be reflected in the
2283 idev as well as routers.
2284 */
2285 if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2286 rt6_mtu_change(dev, dev->mtu);
2287 idev->cnf.mtu6 = dev->mtu;
2288 }
2289 idev->tstamp = jiffies;
2290 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2291 /* If the changed mtu during down is lower than IPV6_MIN_MTU
2292 stop IPv6 on this interface.
2293 */
2294 if (dev->mtu < IPV6_MIN_MTU)
2295 addrconf_ifdown(dev, event != NETDEV_DOWN);
2296 }
2297 break;
2298
2299 case NETDEV_CHANGEMTU:
2300 if ( idev && dev->mtu >= IPV6_MIN_MTU) {
2301 rt6_mtu_change(dev, dev->mtu);
2302 idev->cnf.mtu6 = dev->mtu;
2303 break;
2304 }
2305
2306 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2307
2308 case NETDEV_DOWN:
2309 case NETDEV_UNREGISTER:
2310 /*
2311 * Remove all addresses from this interface.
2312 */
2313 addrconf_ifdown(dev, event != NETDEV_DOWN);
2314 break;
2315
2316 case NETDEV_CHANGENAME:
2317 #ifdef CONFIG_SYSCTL
2318 if (idev) {
2319 addrconf_sysctl_unregister(&idev->cnf);
2320 neigh_sysctl_unregister(idev->nd_parms);
2321 neigh_sysctl_register(dev, idev->nd_parms,
2322 NET_IPV6, NET_IPV6_NEIGH, "ipv6",
2323 &ndisc_ifinfo_sysctl_change,
2324 NULL);
2325 addrconf_sysctl_register(idev, &idev->cnf);
2326 }
2327 #endif
2328 break;
2329 };
2330
2331 return NOTIFY_OK;
2332 }
2333
2334 /*
2335 * addrconf module should be notified of a device going up
2336 */
2337 static struct notifier_block ipv6_dev_notf = {
2338 .notifier_call = addrconf_notify,
2339 .priority = 0
2340 };
2341
2342 static int addrconf_ifdown(struct net_device *dev, int how)
2343 {
2344 struct inet6_dev *idev;
2345 struct inet6_ifaddr *ifa, **bifa;
2346 int i;
2347
2348 ASSERT_RTNL();
2349
2350 if (dev == &loopback_dev && how == 1)
2351 how = 0;
2352
2353 rt6_ifdown(dev);
2354 neigh_ifdown(&nd_tbl, dev);
2355
2356 idev = __in6_dev_get(dev);
2357 if (idev == NULL)
2358 return -ENODEV;
2359
2360 /* Step 1: remove reference to ipv6 device from parent device.
2361 Do not dev_put!
2362 */
2363 if (how == 1) {
2364 idev->dead = 1;
2365
2366 /* protected by rtnl_lock */
2367 rcu_assign_pointer(dev->ip6_ptr, NULL);
2368
2369 /* Step 1.5: remove snmp6 entry */
2370 snmp6_unregister_dev(idev);
2371
2372 }
2373
2374 /* Step 2: clear hash table */
2375 for (i=0; i<IN6_ADDR_HSIZE; i++) {
2376 bifa = &inet6_addr_lst[i];
2377
2378 write_lock_bh(&addrconf_hash_lock);
2379 while ((ifa = *bifa) != NULL) {
2380 if (ifa->idev == idev) {
2381 *bifa = ifa->lst_next;
2382 ifa->lst_next = NULL;
2383 addrconf_del_timer(ifa);
2384 in6_ifa_put(ifa);
2385 continue;
2386 }
2387 bifa = &ifa->lst_next;
2388 }
2389 write_unlock_bh(&addrconf_hash_lock);
2390 }
2391
2392 write_lock_bh(&idev->lock);
2393
2394 /* Step 3: clear flags for stateless addrconf */
2395 if (how != 1)
2396 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2397
2398 /* Step 4: clear address list */
2399 #ifdef CONFIG_IPV6_PRIVACY
2400 if (how == 1 && del_timer(&idev->regen_timer))
2401 in6_dev_put(idev);
2402
2403 /* clear tempaddr list */
2404 while ((ifa = idev->tempaddr_list) != NULL) {
2405 idev->tempaddr_list = ifa->tmp_next;
2406 ifa->tmp_next = NULL;
2407 ifa->dead = 1;
2408 write_unlock_bh(&idev->lock);
2409 spin_lock_bh(&ifa->lock);
2410
2411 if (ifa->ifpub) {
2412 in6_ifa_put(ifa->ifpub);
2413 ifa->ifpub = NULL;
2414 }
2415 spin_unlock_bh(&ifa->lock);
2416 in6_ifa_put(ifa);
2417 write_lock_bh(&idev->lock);
2418 }
2419 #endif
2420 while ((ifa = idev->addr_list) != NULL) {
2421 idev->addr_list = ifa->if_next;
2422 ifa->if_next = NULL;
2423 ifa->dead = 1;
2424 addrconf_del_timer(ifa);
2425 write_unlock_bh(&idev->lock);
2426
2427 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2428 in6_ifa_put(ifa);
2429
2430 write_lock_bh(&idev->lock);
2431 }
2432 write_unlock_bh(&idev->lock);
2433
2434 /* Step 5: Discard multicast list */
2435
2436 if (how == 1)
2437 ipv6_mc_destroy_dev(idev);
2438 else
2439 ipv6_mc_down(idev);
2440
2441 /* Step 5: netlink notification of this interface */
2442 idev->tstamp = jiffies;
2443 inet6_ifinfo_notify(RTM_DELLINK, idev);
2444
2445 /* Shot the device (if unregistered) */
2446
2447 if (how == 1) {
2448 #ifdef CONFIG_SYSCTL
2449 addrconf_sysctl_unregister(&idev->cnf);
2450 neigh_sysctl_unregister(idev->nd_parms);
2451 #endif
2452 neigh_parms_release(&nd_tbl, idev->nd_parms);
2453 neigh_ifdown(&nd_tbl, dev);
2454 in6_dev_put(idev);
2455 }
2456 return 0;
2457 }
2458
2459 static void addrconf_rs_timer(unsigned long data)
2460 {
2461 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2462
2463 if (ifp->idev->cnf.forwarding)
2464 goto out;
2465
2466 if (ifp->idev->if_flags & IF_RA_RCVD) {
2467 /*
2468 * Announcement received after solicitation
2469 * was sent
2470 */
2471 goto out;
2472 }
2473
2474 spin_lock(&ifp->lock);
2475 if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2476 struct in6_addr all_routers;
2477
2478 /* The wait after the last probe can be shorter */
2479 addrconf_mod_timer(ifp, AC_RS,
2480 (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2481 ifp->idev->cnf.rtr_solicit_delay :
2482 ifp->idev->cnf.rtr_solicit_interval);
2483 spin_unlock(&ifp->lock);
2484
2485 ipv6_addr_all_routers(&all_routers);
2486
2487 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2488 } else {
2489 spin_unlock(&ifp->lock);
2490 /*
2491 * Note: we do not support deprecated "all on-link"
2492 * assumption any longer.
2493 */
2494 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2495 ifp->idev->dev->name);
2496 }
2497
2498 out:
2499 in6_ifa_put(ifp);
2500 }
2501
2502 /*
2503 * Duplicate Address Detection
2504 */
2505 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2506 {
2507 unsigned long rand_num;
2508 struct inet6_dev *idev = ifp->idev;
2509
2510 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2511 ifp->probes = idev->cnf.dad_transmits;
2512 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2513 }
2514
2515 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2516 {
2517 struct inet6_dev *idev = ifp->idev;
2518 struct net_device *dev = idev->dev;
2519
2520 addrconf_join_solict(dev, &ifp->addr);
2521
2522 if (ifp->prefix_len != 128 && (ifp->flags&IFA_F_PERMANENT))
2523 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 0,
2524 flags);
2525
2526 net_srandom(ifp->addr.s6_addr32[3]);
2527
2528 read_lock_bh(&idev->lock);
2529 if (ifp->dead)
2530 goto out;
2531 spin_lock_bh(&ifp->lock);
2532
2533 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2534 !(ifp->flags&IFA_F_TENTATIVE) ||
2535 ifp->flags & IFA_F_NODAD) {
2536 ifp->flags &= ~IFA_F_TENTATIVE;
2537 spin_unlock_bh(&ifp->lock);
2538 read_unlock_bh(&idev->lock);
2539
2540 addrconf_dad_completed(ifp);
2541 return;
2542 }
2543
2544 if (!(idev->if_flags & IF_READY)) {
2545 spin_unlock_bh(&ifp->lock);
2546 read_unlock_bh(&idev->lock);
2547 /*
2548 * If the defice is not ready:
2549 * - keep it tentative if it is a permanent address.
2550 * - otherwise, kill it.
2551 */
2552 in6_ifa_hold(ifp);
2553 addrconf_dad_stop(ifp);
2554 return;
2555 }
2556 addrconf_dad_kick(ifp);
2557 spin_unlock_bh(&ifp->lock);
2558 out:
2559 read_unlock_bh(&idev->lock);
2560 }
2561
2562 static void addrconf_dad_timer(unsigned long data)
2563 {
2564 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2565 struct inet6_dev *idev = ifp->idev;
2566 struct in6_addr unspec;
2567 struct in6_addr mcaddr;
2568
2569 read_lock_bh(&idev->lock);
2570 if (idev->dead) {
2571 read_unlock_bh(&idev->lock);
2572 goto out;
2573 }
2574 spin_lock_bh(&ifp->lock);
2575 if (ifp->probes == 0) {
2576 /*
2577 * DAD was successful
2578 */
2579
2580 ifp->flags &= ~IFA_F_TENTATIVE;
2581 spin_unlock_bh(&ifp->lock);
2582 read_unlock_bh(&idev->lock);
2583
2584 addrconf_dad_completed(ifp);
2585
2586 goto out;
2587 }
2588
2589 ifp->probes--;
2590 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2591 spin_unlock_bh(&ifp->lock);
2592 read_unlock_bh(&idev->lock);
2593
2594 /* send a neighbour solicitation for our addr */
2595 memset(&unspec, 0, sizeof(unspec));
2596 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2597 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec);
2598 out:
2599 in6_ifa_put(ifp);
2600 }
2601
2602 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2603 {
2604 struct net_device * dev = ifp->idev->dev;
2605
2606 /*
2607 * Configure the address for reception. Now it is valid.
2608 */
2609
2610 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2611
2612 /* If added prefix is link local and forwarding is off,
2613 start sending router solicitations.
2614 */
2615
2616 if (ifp->idev->cnf.forwarding == 0 &&
2617 ifp->idev->cnf.rtr_solicits > 0 &&
2618 (dev->flags&IFF_LOOPBACK) == 0 &&
2619 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2620 struct in6_addr all_routers;
2621
2622 ipv6_addr_all_routers(&all_routers);
2623
2624 /*
2625 * If a host as already performed a random delay
2626 * [...] as part of DAD [...] there is no need
2627 * to delay again before sending the first RS
2628 */
2629 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2630
2631 spin_lock_bh(&ifp->lock);
2632 ifp->probes = 1;
2633 ifp->idev->if_flags |= IF_RS_SENT;
2634 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2635 spin_unlock_bh(&ifp->lock);
2636 }
2637 }
2638
2639 static void addrconf_dad_run(struct inet6_dev *idev) {
2640 struct inet6_ifaddr *ifp;
2641
2642 read_lock_bh(&idev->lock);
2643 for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2644 spin_lock_bh(&ifp->lock);
2645 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2646 spin_unlock_bh(&ifp->lock);
2647 continue;
2648 }
2649 spin_unlock_bh(&ifp->lock);
2650 addrconf_dad_kick(ifp);
2651 }
2652 read_unlock_bh(&idev->lock);
2653 }
2654
2655 #ifdef CONFIG_PROC_FS
2656 struct if6_iter_state {
2657 int bucket;
2658 };
2659
2660 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2661 {
2662 struct inet6_ifaddr *ifa = NULL;
2663 struct if6_iter_state *state = seq->private;
2664
2665 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2666 ifa = inet6_addr_lst[state->bucket];
2667 if (ifa)
2668 break;
2669 }
2670 return ifa;
2671 }
2672
2673 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2674 {
2675 struct if6_iter_state *state = seq->private;
2676
2677 ifa = ifa->lst_next;
2678 try_again:
2679 if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2680 ifa = inet6_addr_lst[state->bucket];
2681 goto try_again;
2682 }
2683 return ifa;
2684 }
2685
2686 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2687 {
2688 struct inet6_ifaddr *ifa = if6_get_first(seq);
2689
2690 if (ifa)
2691 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2692 --pos;
2693 return pos ? NULL : ifa;
2694 }
2695
2696 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2697 {
2698 read_lock_bh(&addrconf_hash_lock);
2699 return if6_get_idx(seq, *pos);
2700 }
2701
2702 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2703 {
2704 struct inet6_ifaddr *ifa;
2705
2706 ifa = if6_get_next(seq, v);
2707 ++*pos;
2708 return ifa;
2709 }
2710
2711 static void if6_seq_stop(struct seq_file *seq, void *v)
2712 {
2713 read_unlock_bh(&addrconf_hash_lock);
2714 }
2715
2716 static int if6_seq_show(struct seq_file *seq, void *v)
2717 {
2718 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2719 seq_printf(seq,
2720 NIP6_SEQFMT " %02x %02x %02x %02x %8s\n",
2721 NIP6(ifp->addr),
2722 ifp->idev->dev->ifindex,
2723 ifp->prefix_len,
2724 ifp->scope,
2725 ifp->flags,
2726 ifp->idev->dev->name);
2727 return 0;
2728 }
2729
2730 static struct seq_operations if6_seq_ops = {
2731 .start = if6_seq_start,
2732 .next = if6_seq_next,
2733 .show = if6_seq_show,
2734 .stop = if6_seq_stop,
2735 };
2736
2737 static int if6_seq_open(struct inode *inode, struct file *file)
2738 {
2739 struct seq_file *seq;
2740 int rc = -ENOMEM;
2741 struct if6_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL);
2742
2743 if (!s)
2744 goto out;
2745
2746 rc = seq_open(file, &if6_seq_ops);
2747 if (rc)
2748 goto out_kfree;
2749
2750 seq = file->private_data;
2751 seq->private = s;
2752 out:
2753 return rc;
2754 out_kfree:
2755 kfree(s);
2756 goto out;
2757 }
2758
2759 static struct file_operations if6_fops = {
2760 .owner = THIS_MODULE,
2761 .open = if6_seq_open,
2762 .read = seq_read,
2763 .llseek = seq_lseek,
2764 .release = seq_release_private,
2765 };
2766
2767 int __init if6_proc_init(void)
2768 {
2769 if (!proc_net_fops_create("if_inet6", S_IRUGO, &if6_fops))
2770 return -ENOMEM;
2771 return 0;
2772 }
2773
2774 void if6_proc_exit(void)
2775 {
2776 proc_net_remove("if_inet6");
2777 }
2778 #endif /* CONFIG_PROC_FS */
2779
2780 #ifdef CONFIG_IPV6_MIP6
2781 /* Check if address is a home address configured on any interface. */
2782 int ipv6_chk_home_addr(struct in6_addr *addr)
2783 {
2784 int ret = 0;
2785 struct inet6_ifaddr * ifp;
2786 u8 hash = ipv6_addr_hash(addr);
2787 read_lock_bh(&addrconf_hash_lock);
2788 for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) {
2789 if (ipv6_addr_cmp(&ifp->addr, addr) == 0 &&
2790 (ifp->flags & IFA_F_HOMEADDRESS)) {
2791 ret = 1;
2792 break;
2793 }
2794 }
2795 read_unlock_bh(&addrconf_hash_lock);
2796 return ret;
2797 }
2798 #endif
2799
2800 /*
2801 * Periodic address status verification
2802 */
2803
2804 static void addrconf_verify(unsigned long foo)
2805 {
2806 struct inet6_ifaddr *ifp;
2807 unsigned long now, next;
2808 int i;
2809
2810 spin_lock_bh(&addrconf_verify_lock);
2811 now = jiffies;
2812 next = now + ADDR_CHECK_FREQUENCY;
2813
2814 del_timer(&addr_chk_timer);
2815
2816 for (i=0; i < IN6_ADDR_HSIZE; i++) {
2817
2818 restart:
2819 read_lock(&addrconf_hash_lock);
2820 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
2821 unsigned long age;
2822 #ifdef CONFIG_IPV6_PRIVACY
2823 unsigned long regen_advance;
2824 #endif
2825
2826 if (ifp->flags & IFA_F_PERMANENT)
2827 continue;
2828
2829 spin_lock(&ifp->lock);
2830 age = (now - ifp->tstamp) / HZ;
2831
2832 #ifdef CONFIG_IPV6_PRIVACY
2833 regen_advance = ifp->idev->cnf.regen_max_retry *
2834 ifp->idev->cnf.dad_transmits *
2835 ifp->idev->nd_parms->retrans_time / HZ;
2836 #endif
2837
2838 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
2839 age >= ifp->valid_lft) {
2840 spin_unlock(&ifp->lock);
2841 in6_ifa_hold(ifp);
2842 read_unlock(&addrconf_hash_lock);
2843 ipv6_del_addr(ifp);
2844 goto restart;
2845 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
2846 spin_unlock(&ifp->lock);
2847 continue;
2848 } else if (age >= ifp->prefered_lft) {
2849 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
2850 int deprecate = 0;
2851
2852 if (!(ifp->flags&IFA_F_DEPRECATED)) {
2853 deprecate = 1;
2854 ifp->flags |= IFA_F_DEPRECATED;
2855 }
2856
2857 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
2858 next = ifp->tstamp + ifp->valid_lft * HZ;
2859
2860 spin_unlock(&ifp->lock);
2861
2862 if (deprecate) {
2863 in6_ifa_hold(ifp);
2864 read_unlock(&addrconf_hash_lock);
2865
2866 ipv6_ifa_notify(0, ifp);
2867 in6_ifa_put(ifp);
2868 goto restart;
2869 }
2870 #ifdef CONFIG_IPV6_PRIVACY
2871 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
2872 !(ifp->flags&IFA_F_TENTATIVE)) {
2873 if (age >= ifp->prefered_lft - regen_advance) {
2874 struct inet6_ifaddr *ifpub = ifp->ifpub;
2875 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2876 next = ifp->tstamp + ifp->prefered_lft * HZ;
2877 if (!ifp->regen_count && ifpub) {
2878 ifp->regen_count++;
2879 in6_ifa_hold(ifp);
2880 in6_ifa_hold(ifpub);
2881 spin_unlock(&ifp->lock);
2882 read_unlock(&addrconf_hash_lock);
2883 spin_lock(&ifpub->lock);
2884 ifpub->regen_count = 0;
2885 spin_unlock(&ifpub->lock);
2886 ipv6_create_tempaddr(ifpub, ifp);
2887 in6_ifa_put(ifpub);
2888 in6_ifa_put(ifp);
2889 goto restart;
2890 }
2891 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
2892 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
2893 spin_unlock(&ifp->lock);
2894 #endif
2895 } else {
2896 /* ifp->prefered_lft <= ifp->valid_lft */
2897 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2898 next = ifp->tstamp + ifp->prefered_lft * HZ;
2899 spin_unlock(&ifp->lock);
2900 }
2901 }
2902 read_unlock(&addrconf_hash_lock);
2903 }
2904
2905 addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
2906 add_timer(&addr_chk_timer);
2907 spin_unlock_bh(&addrconf_verify_lock);
2908 }
2909
2910 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
2911 {
2912 struct in6_addr *pfx = NULL;
2913
2914 if (addr)
2915 pfx = nla_data(addr);
2916
2917 if (local) {
2918 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
2919 pfx = NULL;
2920 else
2921 pfx = nla_data(local);
2922 }
2923
2924 return pfx;
2925 }
2926
2927 static struct nla_policy ifa_ipv6_policy[IFA_MAX+1] __read_mostly = {
2928 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
2929 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
2930 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
2931 };
2932
2933 static int
2934 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
2935 {
2936 struct ifaddrmsg *ifm;
2937 struct nlattr *tb[IFA_MAX+1];
2938 struct in6_addr *pfx;
2939 int err;
2940
2941 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
2942 if (err < 0)
2943 return err;
2944
2945 ifm = nlmsg_data(nlh);
2946 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
2947 if (pfx == NULL)
2948 return -EINVAL;
2949
2950 return inet6_addr_del(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
2951 }
2952
2953 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
2954 u32 prefered_lft, u32 valid_lft)
2955 {
2956 if (!valid_lft || (prefered_lft > valid_lft))
2957 return -EINVAL;
2958
2959 if (valid_lft == INFINITY_LIFE_TIME)
2960 ifa_flags |= IFA_F_PERMANENT;
2961 else if (valid_lft >= 0x7FFFFFFF/HZ)
2962 valid_lft = 0x7FFFFFFF/HZ;
2963
2964 if (prefered_lft == 0)
2965 ifa_flags |= IFA_F_DEPRECATED;
2966 else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
2967 (prefered_lft != INFINITY_LIFE_TIME))
2968 prefered_lft = 0x7FFFFFFF/HZ;
2969
2970 spin_lock_bh(&ifp->lock);
2971 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
2972 ifp->tstamp = jiffies;
2973 ifp->valid_lft = valid_lft;
2974 ifp->prefered_lft = prefered_lft;
2975
2976 spin_unlock_bh(&ifp->lock);
2977 if (!(ifp->flags&IFA_F_TENTATIVE))
2978 ipv6_ifa_notify(0, ifp);
2979
2980 addrconf_verify(0);
2981
2982 return 0;
2983 }
2984
2985 static int
2986 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
2987 {
2988 struct ifaddrmsg *ifm;
2989 struct nlattr *tb[IFA_MAX+1];
2990 struct in6_addr *pfx;
2991 struct inet6_ifaddr *ifa;
2992 struct net_device *dev;
2993 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
2994 u8 ifa_flags;
2995 int err;
2996
2997 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
2998 if (err < 0)
2999 return err;
3000
3001 ifm = nlmsg_data(nlh);
3002 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3003 if (pfx == NULL)
3004 return -EINVAL;
3005
3006 if (tb[IFA_CACHEINFO]) {
3007 struct ifa_cacheinfo *ci;
3008
3009 ci = nla_data(tb[IFA_CACHEINFO]);
3010 valid_lft = ci->ifa_valid;
3011 preferred_lft = ci->ifa_prefered;
3012 } else {
3013 preferred_lft = INFINITY_LIFE_TIME;
3014 valid_lft = INFINITY_LIFE_TIME;
3015 }
3016
3017 dev = __dev_get_by_index(ifm->ifa_index);
3018 if (dev == NULL)
3019 return -ENODEV;
3020
3021 /* We ignore other flags so far. */
3022 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3023
3024 ifa = ipv6_get_ifaddr(pfx, dev, 1);
3025 if (ifa == NULL) {
3026 /*
3027 * It would be best to check for !NLM_F_CREATE here but
3028 * userspace alreay relies on not having to provide this.
3029 */
3030 return inet6_addr_add(ifm->ifa_index, pfx, ifm->ifa_prefixlen,
3031 ifa_flags, preferred_lft, valid_lft);
3032 }
3033
3034 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3035 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3036 err = -EEXIST;
3037 else
3038 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3039
3040 in6_ifa_put(ifa);
3041
3042 return err;
3043 }
3044
3045 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3046 u8 scope, int ifindex)
3047 {
3048 struct ifaddrmsg *ifm;
3049
3050 ifm = nlmsg_data(nlh);
3051 ifm->ifa_family = AF_INET6;
3052 ifm->ifa_prefixlen = prefixlen;
3053 ifm->ifa_flags = flags;
3054 ifm->ifa_scope = scope;
3055 ifm->ifa_index = ifindex;
3056 }
3057
3058 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3059 unsigned long tstamp, u32 preferred, u32 valid)
3060 {
3061 struct ifa_cacheinfo ci;
3062
3063 ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3064 + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3065 ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3066 + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3067 ci.ifa_prefered = preferred;
3068 ci.ifa_valid = valid;
3069
3070 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3071 }
3072
3073 static inline int rt_scope(int ifa_scope)
3074 {
3075 if (ifa_scope & IFA_HOST)
3076 return RT_SCOPE_HOST;
3077 else if (ifa_scope & IFA_LINK)
3078 return RT_SCOPE_LINK;
3079 else if (ifa_scope & IFA_SITE)
3080 return RT_SCOPE_SITE;
3081 else
3082 return RT_SCOPE_UNIVERSE;
3083 }
3084
3085 static inline int inet6_ifaddr_msgsize(void)
3086 {
3087 return nlmsg_total_size(sizeof(struct ifaddrmsg) +
3088 nla_total_size(16) +
3089 nla_total_size(sizeof(struct ifa_cacheinfo)) +
3090 128);
3091 }
3092
3093 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3094 u32 pid, u32 seq, int event, unsigned int flags)
3095 {
3096 struct nlmsghdr *nlh;
3097 u32 preferred, valid;
3098
3099 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3100 if (nlh == NULL)
3101 return -ENOBUFS;
3102
3103 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3104 ifa->idev->dev->ifindex);
3105
3106 if (!(ifa->flags&IFA_F_PERMANENT)) {
3107 preferred = ifa->prefered_lft;
3108 valid = ifa->valid_lft;
3109 if (preferred != INFINITY_LIFE_TIME) {
3110 long tval = (jiffies - ifa->tstamp)/HZ;
3111 preferred -= tval;
3112 if (valid != INFINITY_LIFE_TIME)
3113 valid -= tval;
3114 }
3115 } else {
3116 preferred = INFINITY_LIFE_TIME;
3117 valid = INFINITY_LIFE_TIME;
3118 }
3119
3120 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3121 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
3122 return nlmsg_cancel(skb, nlh);
3123
3124 return nlmsg_end(skb, nlh);
3125 }
3126
3127 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3128 u32 pid, u32 seq, int event, u16 flags)
3129 {
3130 struct nlmsghdr *nlh;
3131 u8 scope = RT_SCOPE_UNIVERSE;
3132 int ifindex = ifmca->idev->dev->ifindex;
3133
3134 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3135 scope = RT_SCOPE_SITE;
3136
3137 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3138 if (nlh == NULL)
3139 return -ENOBUFS;
3140
3141 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3142 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3143 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3144 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0)
3145 return nlmsg_cancel(skb, nlh);
3146
3147 return nlmsg_end(skb, nlh);
3148 }
3149
3150 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3151 u32 pid, u32 seq, int event, unsigned int flags)
3152 {
3153 struct nlmsghdr *nlh;
3154 u8 scope = RT_SCOPE_UNIVERSE;
3155 int ifindex = ifaca->aca_idev->dev->ifindex;
3156
3157 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3158 scope = RT_SCOPE_SITE;
3159
3160 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3161 if (nlh == NULL)
3162 return -ENOBUFS;
3163
3164 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3165 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3166 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3167 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0)
3168 return nlmsg_cancel(skb, nlh);
3169
3170 return nlmsg_end(skb, nlh);
3171 }
3172
3173 enum addr_type_t
3174 {
3175 UNICAST_ADDR,
3176 MULTICAST_ADDR,
3177 ANYCAST_ADDR,
3178 };
3179
3180 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3181 enum addr_type_t type)
3182 {
3183 int idx, ip_idx;
3184 int s_idx, s_ip_idx;
3185 int err = 1;
3186 struct net_device *dev;
3187 struct inet6_dev *idev = NULL;
3188 struct inet6_ifaddr *ifa;
3189 struct ifmcaddr6 *ifmca;
3190 struct ifacaddr6 *ifaca;
3191
3192 s_idx = cb->args[0];
3193 s_ip_idx = ip_idx = cb->args[1];
3194 read_lock(&dev_base_lock);
3195
3196 for (dev = dev_base, idx = 0; dev; dev = dev->next, idx++) {
3197 if (idx < s_idx)
3198 continue;
3199 if (idx > s_idx)
3200 s_ip_idx = 0;
3201 ip_idx = 0;
3202 if ((idev = in6_dev_get(dev)) == NULL)
3203 continue;
3204 read_lock_bh(&idev->lock);
3205 switch (type) {
3206 case UNICAST_ADDR:
3207 /* unicast address incl. temp addr */
3208 for (ifa = idev->addr_list; ifa;
3209 ifa = ifa->if_next, ip_idx++) {
3210 if (ip_idx < s_ip_idx)
3211 continue;
3212 if ((err = inet6_fill_ifaddr(skb, ifa,
3213 NETLINK_CB(cb->skb).pid,
3214 cb->nlh->nlmsg_seq, RTM_NEWADDR,
3215 NLM_F_MULTI)) <= 0)
3216 goto done;
3217 }
3218 break;
3219 case MULTICAST_ADDR:
3220 /* multicast address */
3221 for (ifmca = idev->mc_list; ifmca;
3222 ifmca = ifmca->next, ip_idx++) {
3223 if (ip_idx < s_ip_idx)
3224 continue;
3225 if ((err = inet6_fill_ifmcaddr(skb, ifmca,
3226 NETLINK_CB(cb->skb).pid,
3227 cb->nlh->nlmsg_seq, RTM_GETMULTICAST,
3228 NLM_F_MULTI)) <= 0)
3229 goto done;
3230 }
3231 break;
3232 case ANYCAST_ADDR:
3233 /* anycast address */
3234 for (ifaca = idev->ac_list; ifaca;
3235 ifaca = ifaca->aca_next, ip_idx++) {
3236 if (ip_idx < s_ip_idx)
3237 continue;
3238 if ((err = inet6_fill_ifacaddr(skb, ifaca,
3239 NETLINK_CB(cb->skb).pid,
3240 cb->nlh->nlmsg_seq, RTM_GETANYCAST,
3241 NLM_F_MULTI)) <= 0)
3242 goto done;
3243 }
3244 break;
3245 default:
3246 break;
3247 }
3248 read_unlock_bh(&idev->lock);
3249 in6_dev_put(idev);
3250 }
3251 done:
3252 if (err <= 0) {
3253 read_unlock_bh(&idev->lock);
3254 in6_dev_put(idev);
3255 }
3256 read_unlock(&dev_base_lock);
3257 cb->args[0] = idx;
3258 cb->args[1] = ip_idx;
3259 return skb->len;
3260 }
3261
3262 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3263 {
3264 enum addr_type_t type = UNICAST_ADDR;
3265 return inet6_dump_addr(skb, cb, type);
3266 }
3267
3268 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3269 {
3270 enum addr_type_t type = MULTICAST_ADDR;
3271 return inet6_dump_addr(skb, cb, type);
3272 }
3273
3274
3275 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3276 {
3277 enum addr_type_t type = ANYCAST_ADDR;
3278 return inet6_dump_addr(skb, cb, type);
3279 }
3280
3281 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3282 void *arg)
3283 {
3284 struct ifaddrmsg *ifm;
3285 struct nlattr *tb[IFA_MAX+1];
3286 struct in6_addr *addr = NULL;
3287 struct net_device *dev = NULL;
3288 struct inet6_ifaddr *ifa;
3289 struct sk_buff *skb;
3290 int err;
3291
3292 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3293 if (err < 0)
3294 goto errout;
3295
3296 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3297 if (addr == NULL) {
3298 err = -EINVAL;
3299 goto errout;
3300 }
3301
3302 ifm = nlmsg_data(nlh);
3303 if (ifm->ifa_index)
3304 dev = __dev_get_by_index(ifm->ifa_index);
3305
3306 if ((ifa = ipv6_get_ifaddr(addr, dev, 1)) == NULL) {
3307 err = -EADDRNOTAVAIL;
3308 goto errout;
3309 }
3310
3311 if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) {
3312 err = -ENOBUFS;
3313 goto errout_ifa;
3314 }
3315
3316 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3317 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3318 if (err < 0) {
3319 kfree_skb(skb);
3320 goto errout_ifa;
3321 }
3322
3323 err = rtnl_unicast(skb, NETLINK_CB(in_skb).pid);
3324 errout_ifa:
3325 in6_ifa_put(ifa);
3326 errout:
3327 return err;
3328 }
3329
3330 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3331 {
3332 struct sk_buff *skb;
3333 int err = -ENOBUFS;
3334
3335 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3336 if (skb == NULL)
3337 goto errout;
3338
3339 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3340 if (err < 0) {
3341 kfree_skb(skb);
3342 goto errout;
3343 }
3344
3345 err = rtnl_notify(skb, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3346 errout:
3347 if (err < 0)
3348 rtnl_set_sk_err(RTNLGRP_IPV6_IFADDR, err);
3349 }
3350
3351 static void inline ipv6_store_devconf(struct ipv6_devconf *cnf,
3352 __s32 *array, int bytes)
3353 {
3354 memset(array, 0, bytes);
3355 array[DEVCONF_FORWARDING] = cnf->forwarding;
3356 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3357 array[DEVCONF_MTU6] = cnf->mtu6;
3358 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3359 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3360 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3361 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3362 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3363 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3364 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3365 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3366 #ifdef CONFIG_IPV6_PRIVACY
3367 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3368 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3369 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3370 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3371 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3372 #endif
3373 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3374 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3375 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3376 #ifdef CONFIG_IPV6_ROUTER_PREF
3377 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3378 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
3379 #ifdef CONFIV_IPV6_ROUTE_INFO
3380 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3381 #endif
3382 #endif
3383 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3384 }
3385
3386 /* Maximum length of ifinfomsg attributes */
3387 #define INET6_IFINFO_RTA_SPACE \
3388 RTA_SPACE(IFNAMSIZ) /* IFNAME */ + \
3389 RTA_SPACE(MAX_ADDR_LEN) /* ADDRESS */ + \
3390 RTA_SPACE(sizeof(u32)) /* MTU */ + \
3391 RTA_SPACE(sizeof(int)) /* LINK */ + \
3392 RTA_SPACE(0) /* PROTINFO */ + \
3393 RTA_SPACE(sizeof(u32)) /* FLAGS */ + \
3394 RTA_SPACE(sizeof(struct ifla_cacheinfo)) /* CACHEINFO */ + \
3395 RTA_SPACE(sizeof(__s32[DEVCONF_MAX])) /* CONF */
3396
3397 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3398 u32 pid, u32 seq, int event, unsigned int flags)
3399 {
3400 struct net_device *dev = idev->dev;
3401 __s32 *array = NULL;
3402 struct ifinfomsg *r;
3403 struct nlmsghdr *nlh;
3404 unsigned char *b = skb->tail;
3405 struct rtattr *subattr;
3406 __u32 mtu = dev->mtu;
3407 struct ifla_cacheinfo ci;
3408
3409 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*r), flags);
3410 r = NLMSG_DATA(nlh);
3411 r->ifi_family = AF_INET6;
3412 r->__ifi_pad = 0;
3413 r->ifi_type = dev->type;
3414 r->ifi_index = dev->ifindex;
3415 r->ifi_flags = dev_get_flags(dev);
3416 r->ifi_change = 0;
3417
3418 RTA_PUT(skb, IFLA_IFNAME, strlen(dev->name)+1, dev->name);
3419
3420 if (dev->addr_len)
3421 RTA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3422
3423 RTA_PUT(skb, IFLA_MTU, sizeof(mtu), &mtu);
3424 if (dev->ifindex != dev->iflink)
3425 RTA_PUT(skb, IFLA_LINK, sizeof(int), &dev->iflink);
3426
3427 subattr = (struct rtattr*)skb->tail;
3428
3429 RTA_PUT(skb, IFLA_PROTINFO, 0, NULL);
3430
3431 /* return the device flags */
3432 RTA_PUT(skb, IFLA_INET6_FLAGS, sizeof(__u32), &idev->if_flags);
3433
3434 /* return interface cacheinfo */
3435 ci.max_reasm_len = IPV6_MAXPLEN;
3436 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3437 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3438 ci.reachable_time = idev->nd_parms->reachable_time;
3439 ci.retrans_time = idev->nd_parms->retrans_time;
3440 RTA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3441
3442 /* return the device sysctl params */
3443 if ((array = kmalloc(DEVCONF_MAX * sizeof(*array), GFP_ATOMIC)) == NULL)
3444 goto rtattr_failure;
3445 ipv6_store_devconf(&idev->cnf, array, DEVCONF_MAX * sizeof(*array));
3446 RTA_PUT(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(*array), array);
3447
3448 /* XXX - Statistics/MC not implemented */
3449 subattr->rta_len = skb->tail - (u8*)subattr;
3450
3451 nlh->nlmsg_len = skb->tail - b;
3452 kfree(array);
3453 return skb->len;
3454
3455 nlmsg_failure:
3456 rtattr_failure:
3457 kfree(array);
3458 skb_trim(skb, b - skb->data);
3459 return -1;
3460 }
3461
3462 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3463 {
3464 int idx, err;
3465 int s_idx = cb->args[0];
3466 struct net_device *dev;
3467 struct inet6_dev *idev;
3468
3469 read_lock(&dev_base_lock);
3470 for (dev=dev_base, idx=0; dev; dev = dev->next, idx++) {
3471 if (idx < s_idx)
3472 continue;
3473 if ((idev = in6_dev_get(dev)) == NULL)
3474 continue;
3475 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
3476 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
3477 in6_dev_put(idev);
3478 if (err <= 0)
3479 break;
3480 }
3481 read_unlock(&dev_base_lock);
3482 cb->args[0] = idx;
3483
3484 return skb->len;
3485 }
3486
3487 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3488 {
3489 struct sk_buff *skb;
3490 int payload = sizeof(struct ifinfomsg) + INET6_IFINFO_RTA_SPACE;
3491 int err = -ENOBUFS;
3492
3493 skb = nlmsg_new(nlmsg_total_size(payload), GFP_ATOMIC);
3494 if (skb == NULL)
3495 goto errout;
3496
3497 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
3498 if (err < 0) {
3499 kfree_skb(skb);
3500 goto errout;
3501 }
3502
3503 err = rtnl_notify(skb, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3504 errout:
3505 if (err < 0)
3506 rtnl_set_sk_err(RTNLGRP_IPV6_IFADDR, err);
3507 }
3508
3509 /* Maximum length of prefix_cacheinfo attributes */
3510 #define INET6_PREFIX_RTA_SPACE \
3511 RTA_SPACE(sizeof(((struct prefix_info *)NULL)->prefix)) /* ADDRESS */ + \
3512 RTA_SPACE(sizeof(struct prefix_cacheinfo)) /* CACHEINFO */
3513
3514 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
3515 struct prefix_info *pinfo, u32 pid, u32 seq,
3516 int event, unsigned int flags)
3517 {
3518 struct prefixmsg *pmsg;
3519 struct nlmsghdr *nlh;
3520 unsigned char *b = skb->tail;
3521 struct prefix_cacheinfo ci;
3522
3523 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*pmsg), flags);
3524 pmsg = NLMSG_DATA(nlh);
3525 pmsg->prefix_family = AF_INET6;
3526 pmsg->prefix_pad1 = 0;
3527 pmsg->prefix_pad2 = 0;
3528 pmsg->prefix_ifindex = idev->dev->ifindex;
3529 pmsg->prefix_len = pinfo->prefix_len;
3530 pmsg->prefix_type = pinfo->type;
3531 pmsg->prefix_pad3 = 0;
3532
3533 pmsg->prefix_flags = 0;
3534 if (pinfo->onlink)
3535 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3536 if (pinfo->autoconf)
3537 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3538
3539 RTA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
3540
3541 ci.preferred_time = ntohl(pinfo->prefered);
3542 ci.valid_time = ntohl(pinfo->valid);
3543 RTA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
3544
3545 nlh->nlmsg_len = skb->tail - b;
3546 return skb->len;
3547
3548 nlmsg_failure:
3549 rtattr_failure:
3550 skb_trim(skb, b - skb->data);
3551 return -1;
3552 }
3553
3554 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
3555 struct prefix_info *pinfo)
3556 {
3557 struct sk_buff *skb;
3558 int payload = sizeof(struct prefixmsg) + INET6_PREFIX_RTA_SPACE;
3559 int err = -ENOBUFS;
3560
3561 skb = nlmsg_new(nlmsg_total_size(payload), GFP_ATOMIC);
3562 if (skb == NULL)
3563 goto errout;
3564
3565 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
3566 if (err < 0) {
3567 kfree_skb(skb);
3568 goto errout;
3569 }
3570
3571 err = rtnl_notify(skb, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
3572 errout:
3573 if (err < 0)
3574 rtnl_set_sk_err(RTNLGRP_IPV6_PREFIX, err);
3575 }
3576
3577 static struct rtnetlink_link inet6_rtnetlink_table[RTM_NR_MSGTYPES] = {
3578 [RTM_GETLINK - RTM_BASE] = { .dumpit = inet6_dump_ifinfo, },
3579 [RTM_NEWADDR - RTM_BASE] = { .doit = inet6_rtm_newaddr, },
3580 [RTM_DELADDR - RTM_BASE] = { .doit = inet6_rtm_deladdr, },
3581 [RTM_GETADDR - RTM_BASE] = { .doit = inet6_rtm_getaddr,
3582 .dumpit = inet6_dump_ifaddr, },
3583 [RTM_GETMULTICAST - RTM_BASE] = { .dumpit = inet6_dump_ifmcaddr, },
3584 [RTM_GETANYCAST - RTM_BASE] = { .dumpit = inet6_dump_ifacaddr, },
3585 [RTM_NEWROUTE - RTM_BASE] = { .doit = inet6_rtm_newroute, },
3586 [RTM_DELROUTE - RTM_BASE] = { .doit = inet6_rtm_delroute, },
3587 [RTM_GETROUTE - RTM_BASE] = { .doit = inet6_rtm_getroute,
3588 .dumpit = inet6_dump_fib, },
3589 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3590 [RTM_GETRULE - RTM_BASE] = { .dumpit = fib6_rules_dump, },
3591 #endif
3592 };
3593
3594 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3595 {
3596 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3597
3598 switch (event) {
3599 case RTM_NEWADDR:
3600 ip6_ins_rt(ifp->rt);
3601 if (ifp->idev->cnf.forwarding)
3602 addrconf_join_anycast(ifp);
3603 break;
3604 case RTM_DELADDR:
3605 if (ifp->idev->cnf.forwarding)
3606 addrconf_leave_anycast(ifp);
3607 addrconf_leave_solict(ifp->idev, &ifp->addr);
3608 dst_hold(&ifp->rt->u.dst);
3609 if (ip6_del_rt(ifp->rt))
3610 dst_free(&ifp->rt->u.dst);
3611 break;
3612 }
3613 }
3614
3615 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3616 {
3617 rcu_read_lock_bh();
3618 if (likely(ifp->idev->dead == 0))
3619 __ipv6_ifa_notify(event, ifp);
3620 rcu_read_unlock_bh();
3621 }
3622
3623 #ifdef CONFIG_SYSCTL
3624
3625 static
3626 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3627 void __user *buffer, size_t *lenp, loff_t *ppos)
3628 {
3629 int *valp = ctl->data;
3630 int val = *valp;
3631 int ret;
3632
3633 ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3634
3635 if (write && valp != &ipv6_devconf_dflt.forwarding) {
3636 if (valp != &ipv6_devconf.forwarding) {
3637 if ((!*valp) ^ (!val)) {
3638 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
3639 if (idev == NULL)
3640 return ret;
3641 dev_forward_change(idev);
3642 }
3643 } else {
3644 ipv6_devconf_dflt.forwarding = ipv6_devconf.forwarding;
3645 addrconf_forward_change();
3646 }
3647 if (*valp)
3648 rt6_purge_dflt_routers();
3649 }
3650
3651 return ret;
3652 }
3653
3654 static int addrconf_sysctl_forward_strategy(ctl_table *table,
3655 int __user *name, int nlen,
3656 void __user *oldval,
3657 size_t __user *oldlenp,
3658 void __user *newval, size_t newlen,
3659 void **context)
3660 {
3661 int *valp = table->data;
3662 int new;
3663
3664 if (!newval || !newlen)
3665 return 0;
3666 if (newlen != sizeof(int))
3667 return -EINVAL;
3668 if (get_user(new, (int __user *)newval))
3669 return -EFAULT;
3670 if (new == *valp)
3671 return 0;
3672 if (oldval && oldlenp) {
3673 size_t len;
3674 if (get_user(len, oldlenp))
3675 return -EFAULT;
3676 if (len) {
3677 if (len > table->maxlen)
3678 len = table->maxlen;
3679 if (copy_to_user(oldval, valp, len))
3680 return -EFAULT;
3681 if (put_user(len, oldlenp))
3682 return -EFAULT;
3683 }
3684 }
3685
3686 if (valp != &ipv6_devconf_dflt.forwarding) {
3687 if (valp != &ipv6_devconf.forwarding) {
3688 struct inet6_dev *idev = (struct inet6_dev *)table->extra1;
3689 int changed;
3690 if (unlikely(idev == NULL))
3691 return -ENODEV;
3692 changed = (!*valp) ^ (!new);
3693 *valp = new;
3694 if (changed)
3695 dev_forward_change(idev);
3696 } else {
3697 *valp = new;
3698 addrconf_forward_change();
3699 }
3700
3701 if (*valp)
3702 rt6_purge_dflt_routers();
3703 } else
3704 *valp = new;
3705
3706 return 1;
3707 }
3708
3709 static struct addrconf_sysctl_table
3710 {
3711 struct ctl_table_header *sysctl_header;
3712 ctl_table addrconf_vars[__NET_IPV6_MAX];
3713 ctl_table addrconf_dev[2];
3714 ctl_table addrconf_conf_dir[2];
3715 ctl_table addrconf_proto_dir[2];
3716 ctl_table addrconf_root_dir[2];
3717 } addrconf_sysctl __read_mostly = {
3718 .sysctl_header = NULL,
3719 .addrconf_vars = {
3720 {
3721 .ctl_name = NET_IPV6_FORWARDING,
3722 .procname = "forwarding",
3723 .data = &ipv6_devconf.forwarding,
3724 .maxlen = sizeof(int),
3725 .mode = 0644,
3726 .proc_handler = &addrconf_sysctl_forward,
3727 .strategy = &addrconf_sysctl_forward_strategy,
3728 },
3729 {
3730 .ctl_name = NET_IPV6_HOP_LIMIT,
3731 .procname = "hop_limit",
3732 .data = &ipv6_devconf.hop_limit,
3733 .maxlen = sizeof(int),
3734 .mode = 0644,
3735 .proc_handler = proc_dointvec,
3736 },
3737 {
3738 .ctl_name = NET_IPV6_MTU,
3739 .procname = "mtu",
3740 .data = &ipv6_devconf.mtu6,
3741 .maxlen = sizeof(int),
3742 .mode = 0644,
3743 .proc_handler = &proc_dointvec,
3744 },
3745 {
3746 .ctl_name = NET_IPV6_ACCEPT_RA,
3747 .procname = "accept_ra",
3748 .data = &ipv6_devconf.accept_ra,
3749 .maxlen = sizeof(int),
3750 .mode = 0644,
3751 .proc_handler = &proc_dointvec,
3752 },
3753 {
3754 .ctl_name = NET_IPV6_ACCEPT_REDIRECTS,
3755 .procname = "accept_redirects",
3756 .data = &ipv6_devconf.accept_redirects,
3757 .maxlen = sizeof(int),
3758 .mode = 0644,
3759 .proc_handler = &proc_dointvec,
3760 },
3761 {
3762 .ctl_name = NET_IPV6_AUTOCONF,
3763 .procname = "autoconf",
3764 .data = &ipv6_devconf.autoconf,
3765 .maxlen = sizeof(int),
3766 .mode = 0644,
3767 .proc_handler = &proc_dointvec,
3768 },
3769 {
3770 .ctl_name = NET_IPV6_DAD_TRANSMITS,
3771 .procname = "dad_transmits",
3772 .data = &ipv6_devconf.dad_transmits,
3773 .maxlen = sizeof(int),
3774 .mode = 0644,
3775 .proc_handler = &proc_dointvec,
3776 },
3777 {
3778 .ctl_name = NET_IPV6_RTR_SOLICITS,
3779 .procname = "router_solicitations",
3780 .data = &ipv6_devconf.rtr_solicits,
3781 .maxlen = sizeof(int),
3782 .mode = 0644,
3783 .proc_handler = &proc_dointvec,
3784 },
3785 {
3786 .ctl_name = NET_IPV6_RTR_SOLICIT_INTERVAL,
3787 .procname = "router_solicitation_interval",
3788 .data = &ipv6_devconf.rtr_solicit_interval,
3789 .maxlen = sizeof(int),
3790 .mode = 0644,
3791 .proc_handler = &proc_dointvec_jiffies,
3792 .strategy = &sysctl_jiffies,
3793 },
3794 {
3795 .ctl_name = NET_IPV6_RTR_SOLICIT_DELAY,
3796 .procname = "router_solicitation_delay",
3797 .data = &ipv6_devconf.rtr_solicit_delay,
3798 .maxlen = sizeof(int),
3799 .mode = 0644,
3800 .proc_handler = &proc_dointvec_jiffies,
3801 .strategy = &sysctl_jiffies,
3802 },
3803 {
3804 .ctl_name = NET_IPV6_FORCE_MLD_VERSION,
3805 .procname = "force_mld_version",
3806 .data = &ipv6_devconf.force_mld_version,
3807 .maxlen = sizeof(int),
3808 .mode = 0644,
3809 .proc_handler = &proc_dointvec,
3810 },
3811 #ifdef CONFIG_IPV6_PRIVACY
3812 {
3813 .ctl_name = NET_IPV6_USE_TEMPADDR,
3814 .procname = "use_tempaddr",
3815 .data = &ipv6_devconf.use_tempaddr,
3816 .maxlen = sizeof(int),
3817 .mode = 0644,
3818 .proc_handler = &proc_dointvec,
3819 },
3820 {
3821 .ctl_name = NET_IPV6_TEMP_VALID_LFT,
3822 .procname = "temp_valid_lft",
3823 .data = &ipv6_devconf.temp_valid_lft,
3824 .maxlen = sizeof(int),
3825 .mode = 0644,
3826 .proc_handler = &proc_dointvec,
3827 },
3828 {
3829 .ctl_name = NET_IPV6_TEMP_PREFERED_LFT,
3830 .procname = "temp_prefered_lft",
3831 .data = &ipv6_devconf.temp_prefered_lft,
3832 .maxlen = sizeof(int),
3833 .mode = 0644,
3834 .proc_handler = &proc_dointvec,
3835 },
3836 {
3837 .ctl_name = NET_IPV6_REGEN_MAX_RETRY,
3838 .procname = "regen_max_retry",
3839 .data = &ipv6_devconf.regen_max_retry,
3840 .maxlen = sizeof(int),
3841 .mode = 0644,
3842 .proc_handler = &proc_dointvec,
3843 },
3844 {
3845 .ctl_name = NET_IPV6_MAX_DESYNC_FACTOR,
3846 .procname = "max_desync_factor",
3847 .data = &ipv6_devconf.max_desync_factor,
3848 .maxlen = sizeof(int),
3849 .mode = 0644,
3850 .proc_handler = &proc_dointvec,
3851 },
3852 #endif
3853 {
3854 .ctl_name = NET_IPV6_MAX_ADDRESSES,
3855 .procname = "max_addresses",
3856 .data = &ipv6_devconf.max_addresses,
3857 .maxlen = sizeof(int),
3858 .mode = 0644,
3859 .proc_handler = &proc_dointvec,
3860 },
3861 {
3862 .ctl_name = NET_IPV6_ACCEPT_RA_DEFRTR,
3863 .procname = "accept_ra_defrtr",
3864 .data = &ipv6_devconf.accept_ra_defrtr,
3865 .maxlen = sizeof(int),
3866 .mode = 0644,
3867 .proc_handler = &proc_dointvec,
3868 },
3869 {
3870 .ctl_name = NET_IPV6_ACCEPT_RA_PINFO,
3871 .procname = "accept_ra_pinfo",
3872 .data = &ipv6_devconf.accept_ra_pinfo,
3873 .maxlen = sizeof(int),
3874 .mode = 0644,
3875 .proc_handler = &proc_dointvec,
3876 },
3877 #ifdef CONFIG_IPV6_ROUTER_PREF
3878 {
3879 .ctl_name = NET_IPV6_ACCEPT_RA_RTR_PREF,
3880 .procname = "accept_ra_rtr_pref",
3881 .data = &ipv6_devconf.accept_ra_rtr_pref,
3882 .maxlen = sizeof(int),
3883 .mode = 0644,
3884 .proc_handler = &proc_dointvec,
3885 },
3886 {
3887 .ctl_name = NET_IPV6_RTR_PROBE_INTERVAL,
3888 .procname = "router_probe_interval",
3889 .data = &ipv6_devconf.rtr_probe_interval,
3890 .maxlen = sizeof(int),
3891 .mode = 0644,
3892 .proc_handler = &proc_dointvec_jiffies,
3893 .strategy = &sysctl_jiffies,
3894 },
3895 #ifdef CONFIV_IPV6_ROUTE_INFO
3896 {
3897 .ctl_name = NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN,
3898 .procname = "accept_ra_rt_info_max_plen",
3899 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
3900 .maxlen = sizeof(int),
3901 .mode = 0644,
3902 .proc_handler = &proc_dointvec,
3903 },
3904 #endif
3905 #endif
3906 {
3907 .ctl_name = NET_IPV6_PROXY_NDP,
3908 .procname = "proxy_ndp",
3909 .data = &ipv6_devconf.proxy_ndp,
3910 .maxlen = sizeof(int),
3911 .mode = 0644,
3912 .proc_handler = &proc_dointvec,
3913 },
3914 {
3915 .ctl_name = 0, /* sentinel */
3916 }
3917 },
3918 .addrconf_dev = {
3919 {
3920 .ctl_name = NET_PROTO_CONF_ALL,
3921 .procname = "all",
3922 .mode = 0555,
3923 .child = addrconf_sysctl.addrconf_vars,
3924 },
3925 {
3926 .ctl_name = 0, /* sentinel */
3927 }
3928 },
3929 .addrconf_conf_dir = {
3930 {
3931 .ctl_name = NET_IPV6_CONF,
3932 .procname = "conf",
3933 .mode = 0555,
3934 .child = addrconf_sysctl.addrconf_dev,
3935 },
3936 {
3937 .ctl_name = 0, /* sentinel */
3938 }
3939 },
3940 .addrconf_proto_dir = {
3941 {
3942 .ctl_name = NET_IPV6,
3943 .procname = "ipv6",
3944 .mode = 0555,
3945 .child = addrconf_sysctl.addrconf_conf_dir,
3946 },
3947 {
3948 .ctl_name = 0, /* sentinel */
3949 }
3950 },
3951 .addrconf_root_dir = {
3952 {
3953 .ctl_name = CTL_NET,
3954 .procname = "net",
3955 .mode = 0555,
3956 .child = addrconf_sysctl.addrconf_proto_dir,
3957 },
3958 {
3959 .ctl_name = 0, /* sentinel */
3960 }
3961 },
3962 };
3963
3964 static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p)
3965 {
3966 int i;
3967 struct net_device *dev = idev ? idev->dev : NULL;
3968 struct addrconf_sysctl_table *t;
3969 char *dev_name = NULL;
3970
3971 t = kmalloc(sizeof(*t), GFP_KERNEL);
3972 if (t == NULL)
3973 return;
3974 memcpy(t, &addrconf_sysctl, sizeof(*t));
3975 for (i=0; t->addrconf_vars[i].data; i++) {
3976 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
3977 t->addrconf_vars[i].de = NULL;
3978 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
3979 }
3980 if (dev) {
3981 dev_name = dev->name;
3982 t->addrconf_dev[0].ctl_name = dev->ifindex;
3983 } else {
3984 dev_name = "default";
3985 t->addrconf_dev[0].ctl_name = NET_PROTO_CONF_DEFAULT;
3986 }
3987
3988 /*
3989 * Make a copy of dev_name, because '.procname' is regarded as const
3990 * by sysctl and we wouldn't want anyone to change it under our feet
3991 * (see SIOCSIFNAME).
3992 */
3993 dev_name = kstrdup(dev_name, GFP_KERNEL);
3994 if (!dev_name)
3995 goto free;
3996
3997 t->addrconf_dev[0].procname = dev_name;
3998
3999 t->addrconf_dev[0].child = t->addrconf_vars;
4000 t->addrconf_dev[0].de = NULL;
4001 t->addrconf_conf_dir[0].child = t->addrconf_dev;
4002 t->addrconf_conf_dir[0].de = NULL;
4003 t->addrconf_proto_dir[0].child = t->addrconf_conf_dir;
4004 t->addrconf_proto_dir[0].de = NULL;
4005 t->addrconf_root_dir[0].child = t->addrconf_proto_dir;
4006 t->addrconf_root_dir[0].de = NULL;
4007
4008 t->sysctl_header = register_sysctl_table(t->addrconf_root_dir, 0);
4009 if (t->sysctl_header == NULL)
4010 goto free_procname;
4011 else
4012 p->sysctl = t;
4013 return;
4014
4015 /* error path */
4016 free_procname:
4017 kfree(dev_name);
4018 free:
4019 kfree(t);
4020
4021 return;
4022 }
4023
4024 static void addrconf_sysctl_unregister(struct ipv6_devconf *p)
4025 {
4026 if (p->sysctl) {
4027 struct addrconf_sysctl_table *t = p->sysctl;
4028 p->sysctl = NULL;
4029 unregister_sysctl_table(t->sysctl_header);
4030 kfree(t->addrconf_dev[0].procname);
4031 kfree(t);
4032 }
4033 }
4034
4035
4036 #endif
4037
4038 /*
4039 * Device notifier
4040 */
4041
4042 int register_inet6addr_notifier(struct notifier_block *nb)
4043 {
4044 return atomic_notifier_chain_register(&inet6addr_chain, nb);
4045 }
4046
4047 int unregister_inet6addr_notifier(struct notifier_block *nb)
4048 {
4049 return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
4050 }
4051
4052 /*
4053 * Init / cleanup code
4054 */
4055
4056 int __init addrconf_init(void)
4057 {
4058 int err = 0;
4059
4060 /* The addrconf netdev notifier requires that loopback_dev
4061 * has it's ipv6 private information allocated and setup
4062 * before it can bring up and give link-local addresses
4063 * to other devices which are up.
4064 *
4065 * Unfortunately, loopback_dev is not necessarily the first
4066 * entry in the global dev_base list of net devices. In fact,
4067 * it is likely to be the very last entry on that list.
4068 * So this causes the notifier registry below to try and
4069 * give link-local addresses to all devices besides loopback_dev
4070 * first, then loopback_dev, which cases all the non-loopback_dev
4071 * devices to fail to get a link-local address.
4072 *
4073 * So, as a temporary fix, allocate the ipv6 structure for
4074 * loopback_dev first by hand.
4075 * Longer term, all of the dependencies ipv6 has upon the loopback
4076 * device and it being up should be removed.
4077 */
4078 rtnl_lock();
4079 if (!ipv6_add_dev(&loopback_dev))
4080 err = -ENOMEM;
4081 rtnl_unlock();
4082 if (err)
4083 return err;
4084
4085 ip6_null_entry.rt6i_idev = in6_dev_get(&loopback_dev);
4086
4087 register_netdevice_notifier(&ipv6_dev_notf);
4088
4089 addrconf_verify(0);
4090 rtnetlink_links[PF_INET6] = inet6_rtnetlink_table;
4091 #ifdef CONFIG_SYSCTL
4092 addrconf_sysctl.sysctl_header =
4093 register_sysctl_table(addrconf_sysctl.addrconf_root_dir, 0);
4094 addrconf_sysctl_register(NULL, &ipv6_devconf_dflt);
4095 #endif
4096
4097 return 0;
4098 }
4099
4100 void __exit addrconf_cleanup(void)
4101 {
4102 struct net_device *dev;
4103 struct inet6_dev *idev;
4104 struct inet6_ifaddr *ifa;
4105 int i;
4106
4107 unregister_netdevice_notifier(&ipv6_dev_notf);
4108
4109 rtnetlink_links[PF_INET6] = NULL;
4110 #ifdef CONFIG_SYSCTL
4111 addrconf_sysctl_unregister(&ipv6_devconf_dflt);
4112 addrconf_sysctl_unregister(&ipv6_devconf);
4113 #endif
4114
4115 rtnl_lock();
4116
4117 /*
4118 * clean dev list.
4119 */
4120
4121 for (dev=dev_base; dev; dev=dev->next) {
4122 if ((idev = __in6_dev_get(dev)) == NULL)
4123 continue;
4124 addrconf_ifdown(dev, 1);
4125 }
4126 addrconf_ifdown(&loopback_dev, 2);
4127
4128 /*
4129 * Check hash table.
4130 */
4131
4132 write_lock_bh(&addrconf_hash_lock);
4133 for (i=0; i < IN6_ADDR_HSIZE; i++) {
4134 for (ifa=inet6_addr_lst[i]; ifa; ) {
4135 struct inet6_ifaddr *bifa;
4136
4137 bifa = ifa;
4138 ifa = ifa->lst_next;
4139 printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
4140 /* Do not free it; something is wrong.
4141 Now we can investigate it with debugger.
4142 */
4143 }
4144 }
4145 write_unlock_bh(&addrconf_hash_lock);
4146
4147 del_timer(&addr_chk_timer);
4148
4149 rtnl_unlock();
4150
4151 #ifdef CONFIG_PROC_FS
4152 proc_net_remove("if_inet6");
4153 #endif
4154 }
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