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[NET]: Make /proc/net per network namespace
[linux-2.6/kmemtrace.git] / net / ipv6 / addrconf.c
blobcd2db728d183d031dd9cfa3232d3555950908c8b
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/net.h>
48 #include <linux/in6.h>
49 #include <linux/netdevice.h>
50 #include <linux/if_addr.h>
51 #include <linux/if_arp.h>
52 #include <linux/if_arcnet.h>
53 #include <linux/if_infiniband.h>
54 #include <linux/route.h>
55 #include <linux/inetdevice.h>
56 #include <linux/init.h>
57 #ifdef CONFIG_SYSCTL
58 #include <linux/sysctl.h>
59 #endif
60 #include <linux/capability.h>
61 #include <linux/delay.h>
62 #include <linux/notifier.h>
63 #include <linux/string.h>
64
65 #include <net/net_namespace.h>
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 #include <asm/unaligned.h>
86
87 #include <linux/proc_fs.h>
88 #include <linux/seq_file.h>
89
90 /* Set to 3 to get tracing... */
91 #define ACONF_DEBUG 2
92
93 #if ACONF_DEBUG >= 3
94 #define ADBG(x) printk x
95 #else
96 #define ADBG(x)
97 #endif
98
99 #define INFINITY_LIFE_TIME 0xFFFFFFFF
100 #define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b)))
101
102 #ifdef CONFIG_SYSCTL
103 static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p);
104 static void addrconf_sysctl_unregister(struct ipv6_devconf *p);
105 #endif
106
107 #ifdef CONFIG_IPV6_PRIVACY
108 static int __ipv6_regen_rndid(struct inet6_dev *idev);
109 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
110 static void ipv6_regen_rndid(unsigned long data);
111
112 static int desync_factor = MAX_DESYNC_FACTOR * HZ;
113 #endif
114
115 static int ipv6_count_addresses(struct inet6_dev *idev);
116
117 /*
118 * Configured unicast address hash table
119 */
120 static struct inet6_ifaddr *inet6_addr_lst[IN6_ADDR_HSIZE];
121 static DEFINE_RWLOCK(addrconf_hash_lock);
122
123 static void addrconf_verify(unsigned long);
124
125 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
126 static DEFINE_SPINLOCK(addrconf_verify_lock);
127
128 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
129 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
130
131 static int addrconf_ifdown(struct net_device *dev, int how);
132
133 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
134 static void addrconf_dad_timer(unsigned long data);
135 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
136 static void addrconf_dad_run(struct inet6_dev *idev);
137 static void addrconf_rs_timer(unsigned long data);
138 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
139 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
140
141 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
142 struct prefix_info *pinfo);
143 static int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev);
144
145 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
146
147 struct ipv6_devconf ipv6_devconf __read_mostly = {
148 .forwarding = 0,
149 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
150 .mtu6 = IPV6_MIN_MTU,
151 .accept_ra = 1,
152 .accept_redirects = 1,
153 .autoconf = 1,
154 .force_mld_version = 0,
155 .dad_transmits = 1,
156 .rtr_solicits = MAX_RTR_SOLICITATIONS,
157 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
158 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
159 #ifdef CONFIG_IPV6_PRIVACY
160 .use_tempaddr = 0,
161 .temp_valid_lft = TEMP_VALID_LIFETIME,
162 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
163 .regen_max_retry = REGEN_MAX_RETRY,
164 .max_desync_factor = MAX_DESYNC_FACTOR,
165 #endif
166 .max_addresses = IPV6_MAX_ADDRESSES,
167 .accept_ra_defrtr = 1,
168 .accept_ra_pinfo = 1,
169 #ifdef CONFIG_IPV6_ROUTER_PREF
170 .accept_ra_rtr_pref = 1,
171 .rtr_probe_interval = 60 * HZ,
172 #ifdef CONFIG_IPV6_ROUTE_INFO
173 .accept_ra_rt_info_max_plen = 0,
174 #endif
175 #endif
176 .proxy_ndp = 0,
177 .accept_source_route = 0, /* we do not accept RH0 by default. */
178 };
179
180 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
181 .forwarding = 0,
182 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
183 .mtu6 = IPV6_MIN_MTU,
184 .accept_ra = 1,
185 .accept_redirects = 1,
186 .autoconf = 1,
187 .dad_transmits = 1,
188 .rtr_solicits = MAX_RTR_SOLICITATIONS,
189 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
190 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
191 #ifdef CONFIG_IPV6_PRIVACY
192 .use_tempaddr = 0,
193 .temp_valid_lft = TEMP_VALID_LIFETIME,
194 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
195 .regen_max_retry = REGEN_MAX_RETRY,
196 .max_desync_factor = MAX_DESYNC_FACTOR,
197 #endif
198 .max_addresses = IPV6_MAX_ADDRESSES,
199 .accept_ra_defrtr = 1,
200 .accept_ra_pinfo = 1,
201 #ifdef CONFIG_IPV6_ROUTER_PREF
202 .accept_ra_rtr_pref = 1,
203 .rtr_probe_interval = 60 * HZ,
204 #ifdef CONFIG_IPV6_ROUTE_INFO
205 .accept_ra_rt_info_max_plen = 0,
206 #endif
207 #endif
208 .proxy_ndp = 0,
209 .accept_source_route = 0, /* we do not accept RH0 by default. */
210 };
211
212 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
213 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
214 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
215
216 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
217 {
218 if (del_timer(&ifp->timer))
219 __in6_ifa_put(ifp);
220 }
221
222 enum addrconf_timer_t
223 {
224 AC_NONE,
225 AC_DAD,
226 AC_RS,
227 };
228
229 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
230 enum addrconf_timer_t what,
231 unsigned long when)
232 {
233 if (!del_timer(&ifp->timer))
234 in6_ifa_hold(ifp);
235
236 switch (what) {
237 case AC_DAD:
238 ifp->timer.function = addrconf_dad_timer;
239 break;
240 case AC_RS:
241 ifp->timer.function = addrconf_rs_timer;
242 break;
243 default:;
244 }
245 ifp->timer.expires = jiffies + when;
246 add_timer(&ifp->timer);
247 }
248
249 static int snmp6_alloc_dev(struct inet6_dev *idev)
250 {
251 int err = -ENOMEM;
252
253 if (!idev || !idev->dev)
254 return -EINVAL;
255
256 if (snmp_mib_init((void **)idev->stats.ipv6,
257 sizeof(struct ipstats_mib),
258 __alignof__(struct ipstats_mib)) < 0)
259 goto err_ip;
260 if (snmp_mib_init((void **)idev->stats.icmpv6,
261 sizeof(struct icmpv6_mib),
262 __alignof__(struct icmpv6_mib)) < 0)
263 goto err_icmp;
264
265 return 0;
266
267 err_icmp:
268 snmp_mib_free((void **)idev->stats.ipv6);
269 err_ip:
270 return err;
271 }
272
273 static int snmp6_free_dev(struct inet6_dev *idev)
274 {
275 snmp_mib_free((void **)idev->stats.icmpv6);
276 snmp_mib_free((void **)idev->stats.ipv6);
277 return 0;
278 }
279
280 /* Nobody refers to this device, we may destroy it. */
281
282 static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
283 {
284 struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
285 kfree(idev);
286 }
287
288 void in6_dev_finish_destroy(struct inet6_dev *idev)
289 {
290 struct net_device *dev = idev->dev;
291 BUG_TRAP(idev->addr_list==NULL);
292 BUG_TRAP(idev->mc_list==NULL);
293 #ifdef NET_REFCNT_DEBUG
294 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
295 #endif
296 dev_put(dev);
297 if (!idev->dead) {
298 printk("Freeing alive inet6 device %p\n", idev);
299 return;
300 }
301 snmp6_free_dev(idev);
302 call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
303 }
304
305 EXPORT_SYMBOL(in6_dev_finish_destroy);
306
307 static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
308 {
309 struct inet6_dev *ndev;
310 struct in6_addr maddr;
311
312 ASSERT_RTNL();
313
314 if (dev->mtu < IPV6_MIN_MTU)
315 return NULL;
316
317 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
318
319 if (ndev == NULL)
320 return NULL;
321
322 rwlock_init(&ndev->lock);
323 ndev->dev = dev;
324 memcpy(&ndev->cnf, &ipv6_devconf_dflt, sizeof(ndev->cnf));
325 ndev->cnf.mtu6 = dev->mtu;
326 ndev->cnf.sysctl = NULL;
327 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
328 if (ndev->nd_parms == NULL) {
329 kfree(ndev);
330 return NULL;
331 }
332 /* We refer to the device */
333 dev_hold(dev);
334
335 if (snmp6_alloc_dev(ndev) < 0) {
336 ADBG((KERN_WARNING
337 "%s(): cannot allocate memory for statistics; dev=%s.\n",
338 __FUNCTION__, dev->name));
339 neigh_parms_release(&nd_tbl, ndev->nd_parms);
340 ndev->dead = 1;
341 in6_dev_finish_destroy(ndev);
342 return NULL;
343 }
344
345 if (snmp6_register_dev(ndev) < 0) {
346 ADBG((KERN_WARNING
347 "%s(): cannot create /proc/net/dev_snmp6/%s\n",
348 __FUNCTION__, dev->name));
349 neigh_parms_release(&nd_tbl, ndev->nd_parms);
350 ndev->dead = 1;
351 in6_dev_finish_destroy(ndev);
352 return NULL;
353 }
354
355 /* One reference from device. We must do this before
356 * we invoke __ipv6_regen_rndid().
357 */
358 in6_dev_hold(ndev);
359
360 #ifdef CONFIG_IPV6_PRIVACY
361 init_timer(&ndev->regen_timer);
362 ndev->regen_timer.function = ipv6_regen_rndid;
363 ndev->regen_timer.data = (unsigned long) ndev;
364 if ((dev->flags&IFF_LOOPBACK) ||
365 dev->type == ARPHRD_TUNNEL ||
366 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
367 dev->type == ARPHRD_SIT ||
368 #endif
369 dev->type == ARPHRD_NONE) {
370 printk(KERN_INFO
371 "%s: Disabled Privacy Extensions\n",
372 dev->name);
373 ndev->cnf.use_tempaddr = -1;
374 } else {
375 in6_dev_hold(ndev);
376 ipv6_regen_rndid((unsigned long) ndev);
377 }
378 #endif
379
380 if (netif_running(dev) && netif_carrier_ok(dev))
381 ndev->if_flags |= IF_READY;
382
383 ipv6_mc_init_dev(ndev);
384 ndev->tstamp = jiffies;
385 #ifdef CONFIG_SYSCTL
386 neigh_sysctl_register(dev, ndev->nd_parms, NET_IPV6,
387 NET_IPV6_NEIGH, "ipv6",
388 &ndisc_ifinfo_sysctl_change,
389 NULL);
390 addrconf_sysctl_register(ndev, &ndev->cnf);
391 #endif
392 /* protected by rtnl_lock */
393 rcu_assign_pointer(dev->ip6_ptr, ndev);
394
395 /* Join all-node multicast group */
396 ipv6_addr_all_nodes(&maddr);
397 ipv6_dev_mc_inc(dev, &maddr);
398
399 return ndev;
400 }
401
402 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
403 {
404 struct inet6_dev *idev;
405
406 ASSERT_RTNL();
407
408 if ((idev = __in6_dev_get(dev)) == NULL) {
409 if ((idev = ipv6_add_dev(dev)) == NULL)
410 return NULL;
411 }
412
413 if (dev->flags&IFF_UP)
414 ipv6_mc_up(idev);
415 return idev;
416 }
417
418 #ifdef CONFIG_SYSCTL
419 static void dev_forward_change(struct inet6_dev *idev)
420 {
421 struct net_device *dev;
422 struct inet6_ifaddr *ifa;
423 struct in6_addr addr;
424
425 if (!idev)
426 return;
427 dev = idev->dev;
428 if (dev && (dev->flags & IFF_MULTICAST)) {
429 ipv6_addr_all_routers(&addr);
430
431 if (idev->cnf.forwarding)
432 ipv6_dev_mc_inc(dev, &addr);
433 else
434 ipv6_dev_mc_dec(dev, &addr);
435 }
436 for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
437 if (ifa->flags&IFA_F_TENTATIVE)
438 continue;
439 if (idev->cnf.forwarding)
440 addrconf_join_anycast(ifa);
441 else
442 addrconf_leave_anycast(ifa);
443 }
444 }
445
446
447 static void addrconf_forward_change(void)
448 {
449 struct net_device *dev;
450 struct inet6_dev *idev;
451
452 read_lock(&dev_base_lock);
453 for_each_netdev(dev) {
454 rcu_read_lock();
455 idev = __in6_dev_get(dev);
456 if (idev) {
457 int changed = (!idev->cnf.forwarding) ^ (!ipv6_devconf.forwarding);
458 idev->cnf.forwarding = ipv6_devconf.forwarding;
459 if (changed)
460 dev_forward_change(idev);
461 }
462 rcu_read_unlock();
463 }
464 read_unlock(&dev_base_lock);
465 }
466 #endif
467
468 /* Nobody refers to this ifaddr, destroy it */
469
470 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
471 {
472 BUG_TRAP(ifp->if_next==NULL);
473 BUG_TRAP(ifp->lst_next==NULL);
474 #ifdef NET_REFCNT_DEBUG
475 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
476 #endif
477
478 in6_dev_put(ifp->idev);
479
480 if (del_timer(&ifp->timer))
481 printk("Timer is still running, when freeing ifa=%p\n", ifp);
482
483 if (!ifp->dead) {
484 printk("Freeing alive inet6 address %p\n", ifp);
485 return;
486 }
487 dst_release(&ifp->rt->u.dst);
488
489 kfree(ifp);
490 }
491
492 static void
493 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
494 {
495 struct inet6_ifaddr *ifa, **ifap;
496 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
497
498 /*
499 * Each device address list is sorted in order of scope -
500 * global before linklocal.
501 */
502 for (ifap = &idev->addr_list; (ifa = *ifap) != NULL;
503 ifap = &ifa->if_next) {
504 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
505 break;
506 }
507
508 ifp->if_next = *ifap;
509 *ifap = ifp;
510 }
511
512 /* On success it returns ifp with increased reference count */
513
514 static struct inet6_ifaddr *
515 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
516 int scope, u32 flags)
517 {
518 struct inet6_ifaddr *ifa = NULL;
519 struct rt6_info *rt;
520 int hash;
521 int err = 0;
522
523 rcu_read_lock_bh();
524 if (idev->dead) {
525 err = -ENODEV; /*XXX*/
526 goto out2;
527 }
528
529 write_lock(&addrconf_hash_lock);
530
531 /* Ignore adding duplicate addresses on an interface */
532 if (ipv6_chk_same_addr(addr, idev->dev)) {
533 ADBG(("ipv6_add_addr: already assigned\n"));
534 err = -EEXIST;
535 goto out;
536 }
537
538 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
539
540 if (ifa == NULL) {
541 ADBG(("ipv6_add_addr: malloc failed\n"));
542 err = -ENOBUFS;
543 goto out;
544 }
545
546 rt = addrconf_dst_alloc(idev, addr, 0);
547 if (IS_ERR(rt)) {
548 err = PTR_ERR(rt);
549 goto out;
550 }
551
552 ipv6_addr_copy(&ifa->addr, addr);
553
554 spin_lock_init(&ifa->lock);
555 init_timer(&ifa->timer);
556 ifa->timer.data = (unsigned long) ifa;
557 ifa->scope = scope;
558 ifa->prefix_len = pfxlen;
559 ifa->flags = flags | IFA_F_TENTATIVE;
560 ifa->cstamp = ifa->tstamp = jiffies;
561
562 ifa->rt = rt;
563
564 /*
565 * part one of RFC 4429, section 3.3
566 * We should not configure an address as
567 * optimistic if we do not yet know the link
568 * layer address of our nexhop router
569 */
570
571 if (rt->rt6i_nexthop == NULL)
572 ifa->flags &= ~IFA_F_OPTIMISTIC;
573
574 ifa->idev = idev;
575 in6_dev_hold(idev);
576 /* For caller */
577 in6_ifa_hold(ifa);
578
579 /* Add to big hash table */
580 hash = ipv6_addr_hash(addr);
581
582 ifa->lst_next = inet6_addr_lst[hash];
583 inet6_addr_lst[hash] = ifa;
584 in6_ifa_hold(ifa);
585 write_unlock(&addrconf_hash_lock);
586
587 write_lock(&idev->lock);
588 /* Add to inet6_dev unicast addr list. */
589 ipv6_link_dev_addr(idev, ifa);
590
591 #ifdef CONFIG_IPV6_PRIVACY
592 if (ifa->flags&IFA_F_TEMPORARY) {
593 ifa->tmp_next = idev->tempaddr_list;
594 idev->tempaddr_list = ifa;
595 in6_ifa_hold(ifa);
596 }
597 #endif
598
599 in6_ifa_hold(ifa);
600 write_unlock(&idev->lock);
601 out2:
602 rcu_read_unlock_bh();
603
604 if (likely(err == 0))
605 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
606 else {
607 kfree(ifa);
608 ifa = ERR_PTR(err);
609 }
610
611 return ifa;
612 out:
613 write_unlock(&addrconf_hash_lock);
614 goto out2;
615 }
616
617 /* This function wants to get referenced ifp and releases it before return */
618
619 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
620 {
621 struct inet6_ifaddr *ifa, **ifap;
622 struct inet6_dev *idev = ifp->idev;
623 int hash;
624 int deleted = 0, onlink = 0;
625 unsigned long expires = jiffies;
626
627 hash = ipv6_addr_hash(&ifp->addr);
628
629 ifp->dead = 1;
630
631 write_lock_bh(&addrconf_hash_lock);
632 for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
633 ifap = &ifa->lst_next) {
634 if (ifa == ifp) {
635 *ifap = ifa->lst_next;
636 __in6_ifa_put(ifp);
637 ifa->lst_next = NULL;
638 break;
639 }
640 }
641 write_unlock_bh(&addrconf_hash_lock);
642
643 write_lock_bh(&idev->lock);
644 #ifdef CONFIG_IPV6_PRIVACY
645 if (ifp->flags&IFA_F_TEMPORARY) {
646 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
647 ifap = &ifa->tmp_next) {
648 if (ifa == ifp) {
649 *ifap = ifa->tmp_next;
650 if (ifp->ifpub) {
651 in6_ifa_put(ifp->ifpub);
652 ifp->ifpub = NULL;
653 }
654 __in6_ifa_put(ifp);
655 ifa->tmp_next = NULL;
656 break;
657 }
658 }
659 }
660 #endif
661
662 for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
663 if (ifa == ifp) {
664 *ifap = ifa->if_next;
665 __in6_ifa_put(ifp);
666 ifa->if_next = NULL;
667 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
668 break;
669 deleted = 1;
670 continue;
671 } else if (ifp->flags & IFA_F_PERMANENT) {
672 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
673 ifp->prefix_len)) {
674 if (ifa->flags & IFA_F_PERMANENT) {
675 onlink = 1;
676 if (deleted)
677 break;
678 } else {
679 unsigned long lifetime;
680
681 if (!onlink)
682 onlink = -1;
683
684 spin_lock(&ifa->lock);
685 lifetime = min_t(unsigned long,
686 ifa->valid_lft, 0x7fffffffUL/HZ);
687 if (time_before(expires,
688 ifa->tstamp + lifetime * HZ))
689 expires = ifa->tstamp + lifetime * HZ;
690 spin_unlock(&ifa->lock);
691 }
692 }
693 }
694 ifap = &ifa->if_next;
695 }
696 write_unlock_bh(&idev->lock);
697
698 ipv6_ifa_notify(RTM_DELADDR, ifp);
699
700 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
701
702 addrconf_del_timer(ifp);
703
704 /*
705 * Purge or update corresponding prefix
706 *
707 * 1) we don't purge prefix here if address was not permanent.
708 * prefix is managed by its own lifetime.
709 * 2) if there're no addresses, delete prefix.
710 * 3) if there're still other permanent address(es),
711 * corresponding prefix is still permanent.
712 * 4) otherwise, update prefix lifetime to the
713 * longest valid lifetime among the corresponding
714 * addresses on the device.
715 * Note: subsequent RA will update lifetime.
716 *
717 * --yoshfuji
718 */
719 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
720 struct in6_addr prefix;
721 struct rt6_info *rt;
722
723 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
724 rt = rt6_lookup(&prefix, NULL, ifp->idev->dev->ifindex, 1);
725
726 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
727 if (onlink == 0) {
728 ip6_del_rt(rt);
729 rt = NULL;
730 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
731 rt->rt6i_expires = expires;
732 rt->rt6i_flags |= RTF_EXPIRES;
733 }
734 }
735 dst_release(&rt->u.dst);
736 }
737
738 in6_ifa_put(ifp);
739 }
740
741 #ifdef CONFIG_IPV6_PRIVACY
742 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
743 {
744 struct inet6_dev *idev = ifp->idev;
745 struct in6_addr addr, *tmpaddr;
746 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
747 int tmp_plen;
748 int ret = 0;
749 int max_addresses;
750 u32 addr_flags;
751
752 write_lock(&idev->lock);
753 if (ift) {
754 spin_lock_bh(&ift->lock);
755 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
756 spin_unlock_bh(&ift->lock);
757 tmpaddr = &addr;
758 } else {
759 tmpaddr = NULL;
760 }
761 retry:
762 in6_dev_hold(idev);
763 if (idev->cnf.use_tempaddr <= 0) {
764 write_unlock(&idev->lock);
765 printk(KERN_INFO
766 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
767 in6_dev_put(idev);
768 ret = -1;
769 goto out;
770 }
771 spin_lock_bh(&ifp->lock);
772 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
773 idev->cnf.use_tempaddr = -1; /*XXX*/
774 spin_unlock_bh(&ifp->lock);
775 write_unlock(&idev->lock);
776 printk(KERN_WARNING
777 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
778 in6_dev_put(idev);
779 ret = -1;
780 goto out;
781 }
782 in6_ifa_hold(ifp);
783 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
784 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
785 spin_unlock_bh(&ifp->lock);
786 write_unlock(&idev->lock);
787 printk(KERN_WARNING
788 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
789 in6_ifa_put(ifp);
790 in6_dev_put(idev);
791 ret = -1;
792 goto out;
793 }
794 memcpy(&addr.s6_addr[8], idev->rndid, 8);
795 tmp_valid_lft = min_t(__u32,
796 ifp->valid_lft,
797 idev->cnf.temp_valid_lft);
798 tmp_prefered_lft = min_t(__u32,
799 ifp->prefered_lft,
800 idev->cnf.temp_prefered_lft - desync_factor / HZ);
801 tmp_plen = ifp->prefix_len;
802 max_addresses = idev->cnf.max_addresses;
803 tmp_cstamp = ifp->cstamp;
804 tmp_tstamp = ifp->tstamp;
805 spin_unlock_bh(&ifp->lock);
806
807 write_unlock(&idev->lock);
808
809 addr_flags = IFA_F_TEMPORARY;
810 /* set in addrconf_prefix_rcv() */
811 if (ifp->flags & IFA_F_OPTIMISTIC)
812 addr_flags |= IFA_F_OPTIMISTIC;
813
814 ift = !max_addresses ||
815 ipv6_count_addresses(idev) < max_addresses ?
816 ipv6_add_addr(idev, &addr, tmp_plen,
817 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
818 addr_flags) : NULL;
819 if (!ift || IS_ERR(ift)) {
820 in6_ifa_put(ifp);
821 in6_dev_put(idev);
822 printk(KERN_INFO
823 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
824 tmpaddr = &addr;
825 write_lock(&idev->lock);
826 goto retry;
827 }
828
829 spin_lock_bh(&ift->lock);
830 ift->ifpub = ifp;
831 ift->valid_lft = tmp_valid_lft;
832 ift->prefered_lft = tmp_prefered_lft;
833 ift->cstamp = tmp_cstamp;
834 ift->tstamp = tmp_tstamp;
835 spin_unlock_bh(&ift->lock);
836
837 addrconf_dad_start(ift, 0);
838 in6_ifa_put(ift);
839 in6_dev_put(idev);
840 out:
841 return ret;
842 }
843 #endif
844
845 /*
846 * Choose an appropriate source address (RFC3484)
847 */
848 struct ipv6_saddr_score {
849 int addr_type;
850 unsigned int attrs;
851 int matchlen;
852 int scope;
853 unsigned int rule;
854 };
855
856 #define IPV6_SADDR_SCORE_LOCAL 0x0001
857 #define IPV6_SADDR_SCORE_PREFERRED 0x0004
858 #define IPV6_SADDR_SCORE_HOA 0x0008
859 #define IPV6_SADDR_SCORE_OIF 0x0010
860 #define IPV6_SADDR_SCORE_LABEL 0x0020
861 #define IPV6_SADDR_SCORE_PRIVACY 0x0040
862
863 static inline int ipv6_saddr_preferred(int type)
864 {
865 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
866 IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
867 return 1;
868 return 0;
869 }
870
871 /* static matching label */
872 static inline int ipv6_saddr_label(const struct in6_addr *addr, int type)
873 {
874 /*
875 * prefix (longest match) label
876 * -----------------------------
877 * ::1/128 0
878 * ::/0 1
879 * 2002::/16 2
880 * ::/96 3
881 * ::ffff:0:0/96 4
882 * fc00::/7 5
883 * 2001::/32 6
884 */
885 if (type & IPV6_ADDR_LOOPBACK)
886 return 0;
887 else if (type & IPV6_ADDR_COMPATv4)
888 return 3;
889 else if (type & IPV6_ADDR_MAPPED)
890 return 4;
891 else if (addr->s6_addr32[0] == htonl(0x20010000))
892 return 6;
893 else if (addr->s6_addr16[0] == htons(0x2002))
894 return 2;
895 else if ((addr->s6_addr[0] & 0xfe) == 0xfc)
896 return 5;
897 return 1;
898 }
899
900 int ipv6_dev_get_saddr(struct net_device *daddr_dev,
901 struct in6_addr *daddr, struct in6_addr *saddr)
902 {
903 struct ipv6_saddr_score hiscore;
904 struct inet6_ifaddr *ifa_result = NULL;
905 int daddr_type = __ipv6_addr_type(daddr);
906 int daddr_scope = __ipv6_addr_src_scope(daddr_type);
907 u32 daddr_label = ipv6_saddr_label(daddr, daddr_type);
908 struct net_device *dev;
909
910 memset(&hiscore, 0, sizeof(hiscore));
911
912 read_lock(&dev_base_lock);
913 rcu_read_lock();
914
915 for_each_netdev(dev) {
916 struct inet6_dev *idev;
917 struct inet6_ifaddr *ifa;
918
919 /* Rule 0: Candidate Source Address (section 4)
920 * - multicast and link-local destination address,
921 * the set of candidate source address MUST only
922 * include addresses assigned to interfaces
923 * belonging to the same link as the outgoing
924 * interface.
925 * (- For site-local destination addresses, the
926 * set of candidate source addresses MUST only
927 * include addresses assigned to interfaces
928 * belonging to the same site as the outgoing
929 * interface.)
930 */
931 if ((daddr_type & IPV6_ADDR_MULTICAST ||
932 daddr_scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
933 daddr_dev && dev != daddr_dev)
934 continue;
935
936 idev = __in6_dev_get(dev);
937 if (!idev)
938 continue;
939
940 read_lock_bh(&idev->lock);
941 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
942 struct ipv6_saddr_score score;
943
944 score.addr_type = __ipv6_addr_type(&ifa->addr);
945
946 /* Rule 0:
947 * - Tentative Address (RFC2462 section 5.4)
948 * - A tentative address is not considered
949 * "assigned to an interface" in the traditional
950 * sense, unless it is also flagged as optimistic.
951 * - Candidate Source Address (section 4)
952 * - In any case, anycast addresses, multicast
953 * addresses, and the unspecified address MUST
954 * NOT be included in a candidate set.
955 */
956 if ((ifa->flags & IFA_F_TENTATIVE) &&
957 (!(ifa->flags & IFA_F_OPTIMISTIC)))
958 continue;
959 if (unlikely(score.addr_type == IPV6_ADDR_ANY ||
960 score.addr_type & IPV6_ADDR_MULTICAST)) {
961 LIMIT_NETDEBUG(KERN_DEBUG
962 "ADDRCONF: unspecified / multicast address"
963 "assigned as unicast address on %s",
964 dev->name);
965 continue;
966 }
967
968 score.attrs = 0;
969 score.matchlen = 0;
970 score.scope = 0;
971 score.rule = 0;
972
973 if (ifa_result == NULL) {
974 /* record it if the first available entry */
975 goto record_it;
976 }
977
978 /* Rule 1: Prefer same address */
979 if (hiscore.rule < 1) {
980 if (ipv6_addr_equal(&ifa_result->addr, daddr))
981 hiscore.attrs |= IPV6_SADDR_SCORE_LOCAL;
982 hiscore.rule++;
983 }
984 if (ipv6_addr_equal(&ifa->addr, daddr)) {
985 score.attrs |= IPV6_SADDR_SCORE_LOCAL;
986 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)) {
987 score.rule = 1;
988 goto record_it;
989 }
990 } else {
991 if (hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)
992 continue;
993 }
994
995 /* Rule 2: Prefer appropriate scope */
996 if (hiscore.rule < 2) {
997 hiscore.scope = __ipv6_addr_src_scope(hiscore.addr_type);
998 hiscore.rule++;
999 }
1000 score.scope = __ipv6_addr_src_scope(score.addr_type);
1001 if (hiscore.scope < score.scope) {
1002 if (hiscore.scope < daddr_scope) {
1003 score.rule = 2;
1004 goto record_it;
1005 } else
1006 continue;
1007 } else if (score.scope < hiscore.scope) {
1008 if (score.scope < daddr_scope)
1009 break; /* addresses sorted by scope */
1010 else {
1011 score.rule = 2;
1012 goto record_it;
1013 }
1014 }
1015
1016 /* Rule 3: Avoid deprecated and optimistic addresses */
1017 if (hiscore.rule < 3) {
1018 if (ipv6_saddr_preferred(hiscore.addr_type) ||
1019 (((ifa_result->flags &
1020 (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)) == 0)))
1021 hiscore.attrs |= IPV6_SADDR_SCORE_PREFERRED;
1022 hiscore.rule++;
1023 }
1024 if (ipv6_saddr_preferred(score.addr_type) ||
1025 (((ifa->flags &
1026 (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)) == 0))) {
1027 score.attrs |= IPV6_SADDR_SCORE_PREFERRED;
1028 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)) {
1029 score.rule = 3;
1030 goto record_it;
1031 }
1032 } else {
1033 if (hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)
1034 continue;
1035 }
1036
1037 /* Rule 4: Prefer home address */
1038 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
1039 if (hiscore.rule < 4) {
1040 if (ifa_result->flags & IFA_F_HOMEADDRESS)
1041 hiscore.attrs |= IPV6_SADDR_SCORE_HOA;
1042 hiscore.rule++;
1043 }
1044 if (ifa->flags & IFA_F_HOMEADDRESS) {
1045 score.attrs |= IPV6_SADDR_SCORE_HOA;
1046 if (!(ifa_result->flags & IFA_F_HOMEADDRESS)) {
1047 score.rule = 4;
1048 goto record_it;
1049 }
1050 } else {
1051 if (hiscore.attrs & IPV6_SADDR_SCORE_HOA)
1052 continue;
1053 }
1054 #else
1055 if (hiscore.rule < 4)
1056 hiscore.rule++;
1057 #endif
1058
1059 /* Rule 5: Prefer outgoing interface */
1060 if (hiscore.rule < 5) {
1061 if (daddr_dev == NULL ||
1062 daddr_dev == ifa_result->idev->dev)
1063 hiscore.attrs |= IPV6_SADDR_SCORE_OIF;
1064 hiscore.rule++;
1065 }
1066 if (daddr_dev == NULL ||
1067 daddr_dev == ifa->idev->dev) {
1068 score.attrs |= IPV6_SADDR_SCORE_OIF;
1069 if (!(hiscore.attrs & IPV6_SADDR_SCORE_OIF)) {
1070 score.rule = 5;
1071 goto record_it;
1072 }
1073 } else {
1074 if (hiscore.attrs & IPV6_SADDR_SCORE_OIF)
1075 continue;
1076 }
1077
1078 /* Rule 6: Prefer matching label */
1079 if (hiscore.rule < 6) {
1080 if (ipv6_saddr_label(&ifa_result->addr, hiscore.addr_type) == daddr_label)
1081 hiscore.attrs |= IPV6_SADDR_SCORE_LABEL;
1082 hiscore.rule++;
1083 }
1084 if (ipv6_saddr_label(&ifa->addr, score.addr_type) == daddr_label) {
1085 score.attrs |= IPV6_SADDR_SCORE_LABEL;
1086 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LABEL)) {
1087 score.rule = 6;
1088 goto record_it;
1089 }
1090 } else {
1091 if (hiscore.attrs & IPV6_SADDR_SCORE_LABEL)
1092 continue;
1093 }
1094
1095 #ifdef CONFIG_IPV6_PRIVACY
1096 /* Rule 7: Prefer public address
1097 * Note: prefer temprary address if use_tempaddr >= 2
1098 */
1099 if (hiscore.rule < 7) {
1100 if ((!(ifa_result->flags & IFA_F_TEMPORARY)) ^
1101 (ifa_result->idev->cnf.use_tempaddr >= 2))
1102 hiscore.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1103 hiscore.rule++;
1104 }
1105 if ((!(ifa->flags & IFA_F_TEMPORARY)) ^
1106 (ifa->idev->cnf.use_tempaddr >= 2)) {
1107 score.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1108 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)) {
1109 score.rule = 7;
1110 goto record_it;
1111 }
1112 } else {
1113 if (hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)
1114 continue;
1115 }
1116 #else
1117 if (hiscore.rule < 7)
1118 hiscore.rule++;
1119 #endif
1120 /* Rule 8: Use longest matching prefix */
1121 if (hiscore.rule < 8) {
1122 hiscore.matchlen = ipv6_addr_diff(&ifa_result->addr, daddr);
1123 hiscore.rule++;
1124 }
1125 score.matchlen = ipv6_addr_diff(&ifa->addr, daddr);
1126 if (score.matchlen > hiscore.matchlen) {
1127 score.rule = 8;
1128 goto record_it;
1129 }
1130 #if 0
1131 else if (score.matchlen < hiscore.matchlen)
1132 continue;
1133 #endif
1134
1135 /* Final Rule: choose first available one */
1136 continue;
1137 record_it:
1138 if (ifa_result)
1139 in6_ifa_put(ifa_result);
1140 in6_ifa_hold(ifa);
1141 ifa_result = ifa;
1142 hiscore = score;
1143 }
1144 read_unlock_bh(&idev->lock);
1145 }
1146 rcu_read_unlock();
1147 read_unlock(&dev_base_lock);
1148
1149 if (!ifa_result)
1150 return -EADDRNOTAVAIL;
1151
1152 ipv6_addr_copy(saddr, &ifa_result->addr);
1153 in6_ifa_put(ifa_result);
1154 return 0;
1155 }
1156
1157
1158 int ipv6_get_saddr(struct dst_entry *dst,
1159 struct in6_addr *daddr, struct in6_addr *saddr)
1160 {
1161 return ipv6_dev_get_saddr(dst ? ip6_dst_idev(dst)->dev : NULL, daddr, saddr);
1162 }
1163
1164 EXPORT_SYMBOL(ipv6_get_saddr);
1165
1166 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1167 unsigned char banned_flags)
1168 {
1169 struct inet6_dev *idev;
1170 int err = -EADDRNOTAVAIL;
1171
1172 rcu_read_lock();
1173 if ((idev = __in6_dev_get(dev)) != NULL) {
1174 struct inet6_ifaddr *ifp;
1175
1176 read_lock_bh(&idev->lock);
1177 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1178 if (ifp->scope == IFA_LINK && !(ifp->flags & banned_flags)) {
1179 ipv6_addr_copy(addr, &ifp->addr);
1180 err = 0;
1181 break;
1182 }
1183 }
1184 read_unlock_bh(&idev->lock);
1185 }
1186 rcu_read_unlock();
1187 return err;
1188 }
1189
1190 static int ipv6_count_addresses(struct inet6_dev *idev)
1191 {
1192 int cnt = 0;
1193 struct inet6_ifaddr *ifp;
1194
1195 read_lock_bh(&idev->lock);
1196 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1197 cnt++;
1198 read_unlock_bh(&idev->lock);
1199 return cnt;
1200 }
1201
1202 int ipv6_chk_addr(struct in6_addr *addr, struct net_device *dev, int strict)
1203 {
1204 struct inet6_ifaddr * ifp;
1205 u8 hash = ipv6_addr_hash(addr);
1206
1207 read_lock_bh(&addrconf_hash_lock);
1208 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1209 if (ipv6_addr_equal(&ifp->addr, addr) &&
1210 !(ifp->flags&IFA_F_TENTATIVE)) {
1211 if (dev == NULL || ifp->idev->dev == dev ||
1212 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1213 break;
1214 }
1215 }
1216 read_unlock_bh(&addrconf_hash_lock);
1217 return ifp != NULL;
1218 }
1219
1220 EXPORT_SYMBOL(ipv6_chk_addr);
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 defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1550 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1551 cfg.fc_flags |= RTF_NONEXTHOP;
1552 #endif
1553
1554 ip6_route_add(&cfg);
1555 }
1556
1557 /* Create "default" multicast route to the interface */
1558
1559 static void addrconf_add_mroute(struct net_device *dev)
1560 {
1561 struct fib6_config cfg = {
1562 .fc_table = RT6_TABLE_LOCAL,
1563 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1564 .fc_ifindex = dev->ifindex,
1565 .fc_dst_len = 8,
1566 .fc_flags = RTF_UP,
1567 };
1568
1569 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1570
1571 ip6_route_add(&cfg);
1572 }
1573
1574 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1575 static void sit_route_add(struct net_device *dev)
1576 {
1577 struct fib6_config cfg = {
1578 .fc_table = RT6_TABLE_MAIN,
1579 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1580 .fc_ifindex = dev->ifindex,
1581 .fc_dst_len = 96,
1582 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1583 };
1584
1585 /* prefix length - 96 bits "::d.d.d.d" */
1586 ip6_route_add(&cfg);
1587 }
1588 #endif
1589
1590 static void addrconf_add_lroute(struct net_device *dev)
1591 {
1592 struct in6_addr addr;
1593
1594 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1595 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1596 }
1597
1598 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1599 {
1600 struct inet6_dev *idev;
1601
1602 ASSERT_RTNL();
1603
1604 if ((idev = ipv6_find_idev(dev)) == NULL)
1605 return NULL;
1606
1607 /* Add default multicast route */
1608 addrconf_add_mroute(dev);
1609
1610 /* Add link local route */
1611 addrconf_add_lroute(dev);
1612 return idev;
1613 }
1614
1615 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1616 {
1617 struct prefix_info *pinfo;
1618 __u32 valid_lft;
1619 __u32 prefered_lft;
1620 int addr_type;
1621 unsigned long rt_expires;
1622 struct inet6_dev *in6_dev;
1623
1624 pinfo = (struct prefix_info *) opt;
1625
1626 if (len < sizeof(struct prefix_info)) {
1627 ADBG(("addrconf: prefix option too short\n"));
1628 return;
1629 }
1630
1631 /*
1632 * Validation checks ([ADDRCONF], page 19)
1633 */
1634
1635 addr_type = ipv6_addr_type(&pinfo->prefix);
1636
1637 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1638 return;
1639
1640 valid_lft = ntohl(pinfo->valid);
1641 prefered_lft = ntohl(pinfo->prefered);
1642
1643 if (prefered_lft > valid_lft) {
1644 if (net_ratelimit())
1645 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1646 return;
1647 }
1648
1649 in6_dev = in6_dev_get(dev);
1650
1651 if (in6_dev == NULL) {
1652 if (net_ratelimit())
1653 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1654 return;
1655 }
1656
1657 /*
1658 * Two things going on here:
1659 * 1) Add routes for on-link prefixes
1660 * 2) Configure prefixes with the auto flag set
1661 */
1662
1663 /* Avoid arithmetic overflow. Really, we could
1664 save rt_expires in seconds, likely valid_lft,
1665 but it would require division in fib gc, that it
1666 not good.
1667 */
1668 if (valid_lft >= 0x7FFFFFFF/HZ)
1669 rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ);
1670 else
1671 rt_expires = valid_lft * HZ;
1672
1673 /*
1674 * We convert this (in jiffies) to clock_t later.
1675 * Avoid arithmetic overflow there as well.
1676 * Overflow can happen only if HZ < USER_HZ.
1677 */
1678 if (HZ < USER_HZ && rt_expires > 0x7FFFFFFF / USER_HZ)
1679 rt_expires = 0x7FFFFFFF / USER_HZ;
1680
1681 if (pinfo->onlink) {
1682 struct rt6_info *rt;
1683 rt = rt6_lookup(&pinfo->prefix, NULL, dev->ifindex, 1);
1684
1685 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
1686 if (rt->rt6i_flags&RTF_EXPIRES) {
1687 if (valid_lft == 0) {
1688 ip6_del_rt(rt);
1689 rt = NULL;
1690 } else {
1691 rt->rt6i_expires = jiffies + rt_expires;
1692 }
1693 }
1694 } else if (valid_lft) {
1695 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1696 dev, jiffies_to_clock_t(rt_expires), RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT);
1697 }
1698 if (rt)
1699 dst_release(&rt->u.dst);
1700 }
1701
1702 /* Try to figure out our local address for this prefix */
1703
1704 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1705 struct inet6_ifaddr * ifp;
1706 struct in6_addr addr;
1707 int create = 0, update_lft = 0;
1708
1709 if (pinfo->prefix_len == 64) {
1710 memcpy(&addr, &pinfo->prefix, 8);
1711 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1712 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1713 in6_dev_put(in6_dev);
1714 return;
1715 }
1716 goto ok;
1717 }
1718 if (net_ratelimit())
1719 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1720 pinfo->prefix_len);
1721 in6_dev_put(in6_dev);
1722 return;
1723
1724 ok:
1725
1726 ifp = ipv6_get_ifaddr(&addr, dev, 1);
1727
1728 if (ifp == NULL && valid_lft) {
1729 int max_addresses = in6_dev->cnf.max_addresses;
1730 u32 addr_flags = 0;
1731
1732 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1733 if (in6_dev->cnf.optimistic_dad &&
1734 !ipv6_devconf.forwarding)
1735 addr_flags = IFA_F_OPTIMISTIC;
1736 #endif
1737
1738 /* Do not allow to create too much of autoconfigured
1739 * addresses; this would be too easy way to crash kernel.
1740 */
1741 if (!max_addresses ||
1742 ipv6_count_addresses(in6_dev) < max_addresses)
1743 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1744 addr_type&IPV6_ADDR_SCOPE_MASK,
1745 addr_flags);
1746
1747 if (!ifp || IS_ERR(ifp)) {
1748 in6_dev_put(in6_dev);
1749 return;
1750 }
1751
1752 update_lft = create = 1;
1753 ifp->cstamp = jiffies;
1754 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1755 }
1756
1757 if (ifp) {
1758 int flags;
1759 unsigned long now;
1760 #ifdef CONFIG_IPV6_PRIVACY
1761 struct inet6_ifaddr *ift;
1762 #endif
1763 u32 stored_lft;
1764
1765 /* update lifetime (RFC2462 5.5.3 e) */
1766 spin_lock(&ifp->lock);
1767 now = jiffies;
1768 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1769 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1770 else
1771 stored_lft = 0;
1772 if (!update_lft && stored_lft) {
1773 if (valid_lft > MIN_VALID_LIFETIME ||
1774 valid_lft > stored_lft)
1775 update_lft = 1;
1776 else if (stored_lft <= MIN_VALID_LIFETIME) {
1777 /* valid_lft <= stored_lft is always true */
1778 /* XXX: IPsec */
1779 update_lft = 0;
1780 } else {
1781 valid_lft = MIN_VALID_LIFETIME;
1782 if (valid_lft < prefered_lft)
1783 prefered_lft = valid_lft;
1784 update_lft = 1;
1785 }
1786 }
1787
1788 if (update_lft) {
1789 ifp->valid_lft = valid_lft;
1790 ifp->prefered_lft = prefered_lft;
1791 ifp->tstamp = now;
1792 flags = ifp->flags;
1793 ifp->flags &= ~IFA_F_DEPRECATED;
1794 spin_unlock(&ifp->lock);
1795
1796 if (!(flags&IFA_F_TENTATIVE))
1797 ipv6_ifa_notify(0, ifp);
1798 } else
1799 spin_unlock(&ifp->lock);
1800
1801 #ifdef CONFIG_IPV6_PRIVACY
1802 read_lock_bh(&in6_dev->lock);
1803 /* update all temporary addresses in the list */
1804 for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1805 /*
1806 * When adjusting the lifetimes of an existing
1807 * temporary address, only lower the lifetimes.
1808 * Implementations must not increase the
1809 * lifetimes of an existing temporary address
1810 * when processing a Prefix Information Option.
1811 */
1812 spin_lock(&ift->lock);
1813 flags = ift->flags;
1814 if (ift->valid_lft > valid_lft &&
1815 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1816 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1817 if (ift->prefered_lft > prefered_lft &&
1818 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1819 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1820 spin_unlock(&ift->lock);
1821 if (!(flags&IFA_F_TENTATIVE))
1822 ipv6_ifa_notify(0, ift);
1823 }
1824
1825 if (create && in6_dev->cnf.use_tempaddr > 0) {
1826 /*
1827 * When a new public address is created as described in [ADDRCONF],
1828 * also create a new temporary address.
1829 */
1830 read_unlock_bh(&in6_dev->lock);
1831 ipv6_create_tempaddr(ifp, NULL);
1832 } else {
1833 read_unlock_bh(&in6_dev->lock);
1834 }
1835 #endif
1836 in6_ifa_put(ifp);
1837 addrconf_verify(0);
1838 }
1839 }
1840 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
1841 in6_dev_put(in6_dev);
1842 }
1843
1844 /*
1845 * Set destination address.
1846 * Special case for SIT interfaces where we create a new "virtual"
1847 * device.
1848 */
1849 int addrconf_set_dstaddr(void __user *arg)
1850 {
1851 struct in6_ifreq ireq;
1852 struct net_device *dev;
1853 int err = -EINVAL;
1854
1855 rtnl_lock();
1856
1857 err = -EFAULT;
1858 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1859 goto err_exit;
1860
1861 dev = __dev_get_by_index(ireq.ifr6_ifindex);
1862
1863 err = -ENODEV;
1864 if (dev == NULL)
1865 goto err_exit;
1866
1867 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1868 if (dev->type == ARPHRD_SIT) {
1869 struct ifreq ifr;
1870 mm_segment_t oldfs;
1871 struct ip_tunnel_parm p;
1872
1873 err = -EADDRNOTAVAIL;
1874 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
1875 goto err_exit;
1876
1877 memset(&p, 0, sizeof(p));
1878 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
1879 p.iph.saddr = 0;
1880 p.iph.version = 4;
1881 p.iph.ihl = 5;
1882 p.iph.protocol = IPPROTO_IPV6;
1883 p.iph.ttl = 64;
1884 ifr.ifr_ifru.ifru_data = (void __user *)&p;
1885
1886 oldfs = get_fs(); set_fs(KERNEL_DS);
1887 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
1888 set_fs(oldfs);
1889
1890 if (err == 0) {
1891 err = -ENOBUFS;
1892 if ((dev = __dev_get_by_name(p.name)) == NULL)
1893 goto err_exit;
1894 err = dev_open(dev);
1895 }
1896 }
1897 #endif
1898
1899 err_exit:
1900 rtnl_unlock();
1901 return err;
1902 }
1903
1904 /*
1905 * Manual configuration of address on an interface
1906 */
1907 static int inet6_addr_add(int ifindex, struct in6_addr *pfx, int plen,
1908 __u8 ifa_flags, __u32 prefered_lft, __u32 valid_lft)
1909 {
1910 struct inet6_ifaddr *ifp;
1911 struct inet6_dev *idev;
1912 struct net_device *dev;
1913 int scope;
1914 u32 flags = RTF_EXPIRES;
1915
1916 ASSERT_RTNL();
1917
1918 /* check the lifetime */
1919 if (!valid_lft || prefered_lft > valid_lft)
1920 return -EINVAL;
1921
1922 if ((dev = __dev_get_by_index(ifindex)) == NULL)
1923 return -ENODEV;
1924
1925 if ((idev = addrconf_add_dev(dev)) == NULL)
1926 return -ENOBUFS;
1927
1928 scope = ipv6_addr_scope(pfx);
1929
1930 if (valid_lft == INFINITY_LIFE_TIME) {
1931 ifa_flags |= IFA_F_PERMANENT;
1932 flags = 0;
1933 } else if (valid_lft >= 0x7FFFFFFF/HZ)
1934 valid_lft = 0x7FFFFFFF/HZ;
1935
1936 if (prefered_lft == 0)
1937 ifa_flags |= IFA_F_DEPRECATED;
1938 else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
1939 (prefered_lft != INFINITY_LIFE_TIME))
1940 prefered_lft = 0x7FFFFFFF/HZ;
1941
1942 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
1943
1944 if (!IS_ERR(ifp)) {
1945 spin_lock_bh(&ifp->lock);
1946 ifp->valid_lft = valid_lft;
1947 ifp->prefered_lft = prefered_lft;
1948 ifp->tstamp = jiffies;
1949 spin_unlock_bh(&ifp->lock);
1950
1951 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
1952 jiffies_to_clock_t(valid_lft * HZ), flags);
1953 /*
1954 * Note that section 3.1 of RFC 4429 indicates
1955 * that the Optimistic flag should not be set for
1956 * manually configured addresses
1957 */
1958 addrconf_dad_start(ifp, 0);
1959 in6_ifa_put(ifp);
1960 addrconf_verify(0);
1961 return 0;
1962 }
1963
1964 return PTR_ERR(ifp);
1965 }
1966
1967 static int inet6_addr_del(int ifindex, struct in6_addr *pfx, int plen)
1968 {
1969 struct inet6_ifaddr *ifp;
1970 struct inet6_dev *idev;
1971 struct net_device *dev;
1972
1973 if ((dev = __dev_get_by_index(ifindex)) == NULL)
1974 return -ENODEV;
1975
1976 if ((idev = __in6_dev_get(dev)) == NULL)
1977 return -ENXIO;
1978
1979 read_lock_bh(&idev->lock);
1980 for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
1981 if (ifp->prefix_len == plen &&
1982 ipv6_addr_equal(pfx, &ifp->addr)) {
1983 in6_ifa_hold(ifp);
1984 read_unlock_bh(&idev->lock);
1985
1986 ipv6_del_addr(ifp);
1987
1988 /* If the last address is deleted administratively,
1989 disable IPv6 on this interface.
1990 */
1991 if (idev->addr_list == NULL)
1992 addrconf_ifdown(idev->dev, 1);
1993 return 0;
1994 }
1995 }
1996 read_unlock_bh(&idev->lock);
1997 return -EADDRNOTAVAIL;
1998 }
1999
2000
2001 int addrconf_add_ifaddr(void __user *arg)
2002 {
2003 struct in6_ifreq ireq;
2004 int err;
2005
2006 if (!capable(CAP_NET_ADMIN))
2007 return -EPERM;
2008
2009 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2010 return -EFAULT;
2011
2012 rtnl_lock();
2013 err = inet6_addr_add(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen,
2014 IFA_F_PERMANENT, INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2015 rtnl_unlock();
2016 return err;
2017 }
2018
2019 int addrconf_del_ifaddr(void __user *arg)
2020 {
2021 struct in6_ifreq ireq;
2022 int err;
2023
2024 if (!capable(CAP_NET_ADMIN))
2025 return -EPERM;
2026
2027 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2028 return -EFAULT;
2029
2030 rtnl_lock();
2031 err = inet6_addr_del(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
2032 rtnl_unlock();
2033 return err;
2034 }
2035
2036 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2037 static void sit_add_v4_addrs(struct inet6_dev *idev)
2038 {
2039 struct inet6_ifaddr * ifp;
2040 struct in6_addr addr;
2041 struct net_device *dev;
2042 int scope;
2043
2044 ASSERT_RTNL();
2045
2046 memset(&addr, 0, sizeof(struct in6_addr));
2047 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2048
2049 if (idev->dev->flags&IFF_POINTOPOINT) {
2050 addr.s6_addr32[0] = htonl(0xfe800000);
2051 scope = IFA_LINK;
2052 } else {
2053 scope = IPV6_ADDR_COMPATv4;
2054 }
2055
2056 if (addr.s6_addr32[3]) {
2057 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
2058 if (!IS_ERR(ifp)) {
2059 spin_lock_bh(&ifp->lock);
2060 ifp->flags &= ~IFA_F_TENTATIVE;
2061 spin_unlock_bh(&ifp->lock);
2062 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2063 in6_ifa_put(ifp);
2064 }
2065 return;
2066 }
2067
2068 for_each_netdev(dev) {
2069 struct in_device * in_dev = __in_dev_get_rtnl(dev);
2070 if (in_dev && (dev->flags & IFF_UP)) {
2071 struct in_ifaddr * ifa;
2072
2073 int flag = scope;
2074
2075 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2076 int plen;
2077
2078 addr.s6_addr32[3] = ifa->ifa_local;
2079
2080 if (ifa->ifa_scope == RT_SCOPE_LINK)
2081 continue;
2082 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2083 if (idev->dev->flags&IFF_POINTOPOINT)
2084 continue;
2085 flag |= IFA_HOST;
2086 }
2087 if (idev->dev->flags&IFF_POINTOPOINT)
2088 plen = 64;
2089 else
2090 plen = 96;
2091
2092 ifp = ipv6_add_addr(idev, &addr, plen, flag,
2093 IFA_F_PERMANENT);
2094 if (!IS_ERR(ifp)) {
2095 spin_lock_bh(&ifp->lock);
2096 ifp->flags &= ~IFA_F_TENTATIVE;
2097 spin_unlock_bh(&ifp->lock);
2098 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2099 in6_ifa_put(ifp);
2100 }
2101 }
2102 }
2103 }
2104 }
2105 #endif
2106
2107 static void init_loopback(struct net_device *dev)
2108 {
2109 struct inet6_dev *idev;
2110 struct inet6_ifaddr * ifp;
2111
2112 /* ::1 */
2113
2114 ASSERT_RTNL();
2115
2116 if ((idev = ipv6_find_idev(dev)) == NULL) {
2117 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2118 return;
2119 }
2120
2121 ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
2122 if (!IS_ERR(ifp)) {
2123 spin_lock_bh(&ifp->lock);
2124 ifp->flags &= ~IFA_F_TENTATIVE;
2125 spin_unlock_bh(&ifp->lock);
2126 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2127 in6_ifa_put(ifp);
2128 }
2129 }
2130
2131 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2132 {
2133 struct inet6_ifaddr * ifp;
2134 u32 addr_flags = IFA_F_PERMANENT;
2135
2136 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2137 if (idev->cnf.optimistic_dad &&
2138 !ipv6_devconf.forwarding)
2139 addr_flags |= IFA_F_OPTIMISTIC;
2140 #endif
2141
2142
2143 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2144 if (!IS_ERR(ifp)) {
2145 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2146 addrconf_dad_start(ifp, 0);
2147 in6_ifa_put(ifp);
2148 }
2149 }
2150
2151 static void addrconf_dev_config(struct net_device *dev)
2152 {
2153 struct in6_addr addr;
2154 struct inet6_dev * idev;
2155
2156 ASSERT_RTNL();
2157
2158 if ((dev->type != ARPHRD_ETHER) &&
2159 (dev->type != ARPHRD_FDDI) &&
2160 (dev->type != ARPHRD_IEEE802_TR) &&
2161 (dev->type != ARPHRD_ARCNET) &&
2162 (dev->type != ARPHRD_INFINIBAND)) {
2163 /* Alas, we support only Ethernet autoconfiguration. */
2164 return;
2165 }
2166
2167 idev = addrconf_add_dev(dev);
2168 if (idev == NULL)
2169 return;
2170
2171 memset(&addr, 0, sizeof(struct in6_addr));
2172 addr.s6_addr32[0] = htonl(0xFE800000);
2173
2174 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2175 addrconf_add_linklocal(idev, &addr);
2176 }
2177
2178 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2179 static void addrconf_sit_config(struct net_device *dev)
2180 {
2181 struct inet6_dev *idev;
2182
2183 ASSERT_RTNL();
2184
2185 /*
2186 * Configure the tunnel with one of our IPv4
2187 * addresses... we should configure all of
2188 * our v4 addrs in the tunnel
2189 */
2190
2191 if ((idev = ipv6_find_idev(dev)) == NULL) {
2192 printk(KERN_DEBUG "init sit: add_dev failed\n");
2193 return;
2194 }
2195
2196 sit_add_v4_addrs(idev);
2197
2198 if (dev->flags&IFF_POINTOPOINT) {
2199 addrconf_add_mroute(dev);
2200 addrconf_add_lroute(dev);
2201 } else
2202 sit_route_add(dev);
2203 }
2204 #endif
2205
2206 static inline int
2207 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2208 {
2209 struct in6_addr lladdr;
2210
2211 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2212 addrconf_add_linklocal(idev, &lladdr);
2213 return 0;
2214 }
2215 return -1;
2216 }
2217
2218 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2219 {
2220 struct net_device *link_dev;
2221
2222 /* first try to inherit the link-local address from the link device */
2223 if (idev->dev->iflink &&
2224 (link_dev = __dev_get_by_index(idev->dev->iflink))) {
2225 if (!ipv6_inherit_linklocal(idev, link_dev))
2226 return;
2227 }
2228 /* then try to inherit it from any device */
2229 for_each_netdev(link_dev) {
2230 if (!ipv6_inherit_linklocal(idev, link_dev))
2231 return;
2232 }
2233 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2234 }
2235
2236 /*
2237 * Autoconfigure tunnel with a link-local address so routing protocols,
2238 * DHCPv6, MLD etc. can be run over the virtual link
2239 */
2240
2241 static void addrconf_ip6_tnl_config(struct net_device *dev)
2242 {
2243 struct inet6_dev *idev;
2244
2245 ASSERT_RTNL();
2246
2247 if ((idev = addrconf_add_dev(dev)) == NULL) {
2248 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2249 return;
2250 }
2251 ip6_tnl_add_linklocal(idev);
2252 }
2253
2254 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2255 void * data)
2256 {
2257 struct net_device *dev = (struct net_device *) data;
2258 struct inet6_dev *idev = __in6_dev_get(dev);
2259 int run_pending = 0;
2260 int err;
2261
2262 switch(event) {
2263 case NETDEV_REGISTER:
2264 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2265 idev = ipv6_add_dev(dev);
2266 if (!idev)
2267 return notifier_from_errno(-ENOMEM);
2268 }
2269 break;
2270 case NETDEV_UP:
2271 case NETDEV_CHANGE:
2272 if (dev->flags & IFF_SLAVE)
2273 break;
2274
2275 if (event == NETDEV_UP) {
2276 if (!netif_carrier_ok(dev)) {
2277 /* device is not ready yet. */
2278 printk(KERN_INFO
2279 "ADDRCONF(NETDEV_UP): %s: "
2280 "link is not ready\n",
2281 dev->name);
2282 break;
2283 }
2284
2285 if (idev)
2286 idev->if_flags |= IF_READY;
2287 } else {
2288 if (!netif_carrier_ok(dev)) {
2289 /* device is still not ready. */
2290 break;
2291 }
2292
2293 if (idev) {
2294 if (idev->if_flags & IF_READY) {
2295 /* device is already configured. */
2296 break;
2297 }
2298 idev->if_flags |= IF_READY;
2299 }
2300
2301 printk(KERN_INFO
2302 "ADDRCONF(NETDEV_CHANGE): %s: "
2303 "link becomes ready\n",
2304 dev->name);
2305
2306 run_pending = 1;
2307 }
2308
2309 switch(dev->type) {
2310 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2311 case ARPHRD_SIT:
2312 addrconf_sit_config(dev);
2313 break;
2314 #endif
2315 case ARPHRD_TUNNEL6:
2316 addrconf_ip6_tnl_config(dev);
2317 break;
2318 case ARPHRD_LOOPBACK:
2319 init_loopback(dev);
2320 break;
2321
2322 default:
2323 addrconf_dev_config(dev);
2324 break;
2325 }
2326 if (idev) {
2327 if (run_pending)
2328 addrconf_dad_run(idev);
2329
2330 /* If the MTU changed during the interface down, when the
2331 interface up, the changed MTU must be reflected in the
2332 idev as well as routers.
2333 */
2334 if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2335 rt6_mtu_change(dev, dev->mtu);
2336 idev->cnf.mtu6 = dev->mtu;
2337 }
2338 idev->tstamp = jiffies;
2339 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2340 /* If the changed mtu during down is lower than IPV6_MIN_MTU
2341 stop IPv6 on this interface.
2342 */
2343 if (dev->mtu < IPV6_MIN_MTU)
2344 addrconf_ifdown(dev, event != NETDEV_DOWN);
2345 }
2346 break;
2347
2348 case NETDEV_CHANGEMTU:
2349 if ( idev && dev->mtu >= IPV6_MIN_MTU) {
2350 rt6_mtu_change(dev, dev->mtu);
2351 idev->cnf.mtu6 = dev->mtu;
2352 break;
2353 }
2354
2355 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2356
2357 case NETDEV_DOWN:
2358 case NETDEV_UNREGISTER:
2359 /*
2360 * Remove all addresses from this interface.
2361 */
2362 addrconf_ifdown(dev, event != NETDEV_DOWN);
2363 break;
2364
2365 case NETDEV_CHANGENAME:
2366 if (idev) {
2367 snmp6_unregister_dev(idev);
2368 #ifdef CONFIG_SYSCTL
2369 addrconf_sysctl_unregister(&idev->cnf);
2370 neigh_sysctl_unregister(idev->nd_parms);
2371 neigh_sysctl_register(dev, idev->nd_parms,
2372 NET_IPV6, NET_IPV6_NEIGH, "ipv6",
2373 &ndisc_ifinfo_sysctl_change,
2374 NULL);
2375 addrconf_sysctl_register(idev, &idev->cnf);
2376 #endif
2377 err = snmp6_register_dev(idev);
2378 if (err)
2379 return notifier_from_errno(err);
2380 }
2381 break;
2382 }
2383
2384 return NOTIFY_OK;
2385 }
2386
2387 /*
2388 * addrconf module should be notified of a device going up
2389 */
2390 static struct notifier_block ipv6_dev_notf = {
2391 .notifier_call = addrconf_notify,
2392 .priority = 0
2393 };
2394
2395 static int addrconf_ifdown(struct net_device *dev, int how)
2396 {
2397 struct inet6_dev *idev;
2398 struct inet6_ifaddr *ifa, **bifa;
2399 int i;
2400
2401 ASSERT_RTNL();
2402
2403 if (dev == &loopback_dev && how == 1)
2404 how = 0;
2405
2406 rt6_ifdown(dev);
2407 neigh_ifdown(&nd_tbl, dev);
2408
2409 idev = __in6_dev_get(dev);
2410 if (idev == NULL)
2411 return -ENODEV;
2412
2413 /* Step 1: remove reference to ipv6 device from parent device.
2414 Do not dev_put!
2415 */
2416 if (how == 1) {
2417 idev->dead = 1;
2418
2419 /* protected by rtnl_lock */
2420 rcu_assign_pointer(dev->ip6_ptr, NULL);
2421
2422 /* Step 1.5: remove snmp6 entry */
2423 snmp6_unregister_dev(idev);
2424
2425 }
2426
2427 /* Step 2: clear hash table */
2428 for (i=0; i<IN6_ADDR_HSIZE; i++) {
2429 bifa = &inet6_addr_lst[i];
2430
2431 write_lock_bh(&addrconf_hash_lock);
2432 while ((ifa = *bifa) != NULL) {
2433 if (ifa->idev == idev) {
2434 *bifa = ifa->lst_next;
2435 ifa->lst_next = NULL;
2436 addrconf_del_timer(ifa);
2437 in6_ifa_put(ifa);
2438 continue;
2439 }
2440 bifa = &ifa->lst_next;
2441 }
2442 write_unlock_bh(&addrconf_hash_lock);
2443 }
2444
2445 write_lock_bh(&idev->lock);
2446
2447 /* Step 3: clear flags for stateless addrconf */
2448 if (how != 1)
2449 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2450
2451 /* Step 4: clear address list */
2452 #ifdef CONFIG_IPV6_PRIVACY
2453 if (how == 1 && del_timer(&idev->regen_timer))
2454 in6_dev_put(idev);
2455
2456 /* clear tempaddr list */
2457 while ((ifa = idev->tempaddr_list) != NULL) {
2458 idev->tempaddr_list = ifa->tmp_next;
2459 ifa->tmp_next = NULL;
2460 ifa->dead = 1;
2461 write_unlock_bh(&idev->lock);
2462 spin_lock_bh(&ifa->lock);
2463
2464 if (ifa->ifpub) {
2465 in6_ifa_put(ifa->ifpub);
2466 ifa->ifpub = NULL;
2467 }
2468 spin_unlock_bh(&ifa->lock);
2469 in6_ifa_put(ifa);
2470 write_lock_bh(&idev->lock);
2471 }
2472 #endif
2473 while ((ifa = idev->addr_list) != NULL) {
2474 idev->addr_list = ifa->if_next;
2475 ifa->if_next = NULL;
2476 ifa->dead = 1;
2477 addrconf_del_timer(ifa);
2478 write_unlock_bh(&idev->lock);
2479
2480 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2481 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2482 in6_ifa_put(ifa);
2483
2484 write_lock_bh(&idev->lock);
2485 }
2486 write_unlock_bh(&idev->lock);
2487
2488 /* Step 5: Discard multicast list */
2489
2490 if (how == 1)
2491 ipv6_mc_destroy_dev(idev);
2492 else
2493 ipv6_mc_down(idev);
2494
2495 /* Step 5: netlink notification of this interface */
2496 idev->tstamp = jiffies;
2497 inet6_ifinfo_notify(RTM_DELLINK, idev);
2498
2499 /* Shot the device (if unregistered) */
2500
2501 if (how == 1) {
2502 #ifdef CONFIG_SYSCTL
2503 addrconf_sysctl_unregister(&idev->cnf);
2504 neigh_sysctl_unregister(idev->nd_parms);
2505 #endif
2506 neigh_parms_release(&nd_tbl, idev->nd_parms);
2507 neigh_ifdown(&nd_tbl, dev);
2508 in6_dev_put(idev);
2509 }
2510 return 0;
2511 }
2512
2513 static void addrconf_rs_timer(unsigned long data)
2514 {
2515 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2516
2517 if (ifp->idev->cnf.forwarding)
2518 goto out;
2519
2520 if (ifp->idev->if_flags & IF_RA_RCVD) {
2521 /*
2522 * Announcement received after solicitation
2523 * was sent
2524 */
2525 goto out;
2526 }
2527
2528 spin_lock(&ifp->lock);
2529 if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2530 struct in6_addr all_routers;
2531
2532 /* The wait after the last probe can be shorter */
2533 addrconf_mod_timer(ifp, AC_RS,
2534 (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2535 ifp->idev->cnf.rtr_solicit_delay :
2536 ifp->idev->cnf.rtr_solicit_interval);
2537 spin_unlock(&ifp->lock);
2538
2539 ipv6_addr_all_routers(&all_routers);
2540
2541 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2542 } else {
2543 spin_unlock(&ifp->lock);
2544 /*
2545 * Note: we do not support deprecated "all on-link"
2546 * assumption any longer.
2547 */
2548 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2549 ifp->idev->dev->name);
2550 }
2551
2552 out:
2553 in6_ifa_put(ifp);
2554 }
2555
2556 /*
2557 * Duplicate Address Detection
2558 */
2559 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2560 {
2561 unsigned long rand_num;
2562 struct inet6_dev *idev = ifp->idev;
2563
2564 if (ifp->flags & IFA_F_OPTIMISTIC)
2565 rand_num = 0;
2566 else
2567 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2568
2569 ifp->probes = idev->cnf.dad_transmits;
2570 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2571 }
2572
2573 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2574 {
2575 struct inet6_dev *idev = ifp->idev;
2576 struct net_device *dev = idev->dev;
2577
2578 addrconf_join_solict(dev, &ifp->addr);
2579
2580 net_srandom(ifp->addr.s6_addr32[3]);
2581
2582 read_lock_bh(&idev->lock);
2583 if (ifp->dead)
2584 goto out;
2585 spin_lock_bh(&ifp->lock);
2586
2587 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2588 !(ifp->flags&IFA_F_TENTATIVE) ||
2589 ifp->flags & IFA_F_NODAD) {
2590 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
2591 spin_unlock_bh(&ifp->lock);
2592 read_unlock_bh(&idev->lock);
2593
2594 addrconf_dad_completed(ifp);
2595 return;
2596 }
2597
2598 if (!(idev->if_flags & IF_READY)) {
2599 spin_unlock_bh(&ifp->lock);
2600 read_unlock_bh(&idev->lock);
2601 /*
2602 * If the defice is not ready:
2603 * - keep it tentative if it is a permanent address.
2604 * - otherwise, kill it.
2605 */
2606 in6_ifa_hold(ifp);
2607 addrconf_dad_stop(ifp);
2608 return;
2609 }
2610
2611 /*
2612 * Optimistic nodes can start receiving
2613 * Frames right away
2614 */
2615 if(ifp->flags & IFA_F_OPTIMISTIC)
2616 ip6_ins_rt(ifp->rt);
2617
2618 addrconf_dad_kick(ifp);
2619 spin_unlock_bh(&ifp->lock);
2620 out:
2621 read_unlock_bh(&idev->lock);
2622 }
2623
2624 static void addrconf_dad_timer(unsigned long data)
2625 {
2626 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2627 struct inet6_dev *idev = ifp->idev;
2628 struct in6_addr unspec;
2629 struct in6_addr mcaddr;
2630
2631 read_lock_bh(&idev->lock);
2632 if (idev->dead) {
2633 read_unlock_bh(&idev->lock);
2634 goto out;
2635 }
2636 spin_lock_bh(&ifp->lock);
2637 if (ifp->probes == 0) {
2638 /*
2639 * DAD was successful
2640 */
2641
2642 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
2643 spin_unlock_bh(&ifp->lock);
2644 read_unlock_bh(&idev->lock);
2645
2646 addrconf_dad_completed(ifp);
2647
2648 goto out;
2649 }
2650
2651 ifp->probes--;
2652 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2653 spin_unlock_bh(&ifp->lock);
2654 read_unlock_bh(&idev->lock);
2655
2656 /* send a neighbour solicitation for our addr */
2657 memset(&unspec, 0, sizeof(unspec));
2658 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2659 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec);
2660 out:
2661 in6_ifa_put(ifp);
2662 }
2663
2664 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2665 {
2666 struct net_device * dev = ifp->idev->dev;
2667
2668 /*
2669 * Configure the address for reception. Now it is valid.
2670 */
2671
2672 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2673
2674 /* If added prefix is link local and forwarding is off,
2675 start sending router solicitations.
2676 */
2677
2678 if (ifp->idev->cnf.forwarding == 0 &&
2679 ifp->idev->cnf.rtr_solicits > 0 &&
2680 (dev->flags&IFF_LOOPBACK) == 0 &&
2681 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2682 struct in6_addr all_routers;
2683
2684 ipv6_addr_all_routers(&all_routers);
2685
2686 /*
2687 * If a host as already performed a random delay
2688 * [...] as part of DAD [...] there is no need
2689 * to delay again before sending the first RS
2690 */
2691 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2692
2693 spin_lock_bh(&ifp->lock);
2694 ifp->probes = 1;
2695 ifp->idev->if_flags |= IF_RS_SENT;
2696 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2697 spin_unlock_bh(&ifp->lock);
2698 }
2699 }
2700
2701 static void addrconf_dad_run(struct inet6_dev *idev) {
2702 struct inet6_ifaddr *ifp;
2703
2704 read_lock_bh(&idev->lock);
2705 for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2706 spin_lock_bh(&ifp->lock);
2707 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2708 spin_unlock_bh(&ifp->lock);
2709 continue;
2710 }
2711 spin_unlock_bh(&ifp->lock);
2712 addrconf_dad_kick(ifp);
2713 }
2714 read_unlock_bh(&idev->lock);
2715 }
2716
2717 #ifdef CONFIG_PROC_FS
2718 struct if6_iter_state {
2719 int bucket;
2720 };
2721
2722 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2723 {
2724 struct inet6_ifaddr *ifa = NULL;
2725 struct if6_iter_state *state = seq->private;
2726
2727 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2728 ifa = inet6_addr_lst[state->bucket];
2729 if (ifa)
2730 break;
2731 }
2732 return ifa;
2733 }
2734
2735 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2736 {
2737 struct if6_iter_state *state = seq->private;
2738
2739 ifa = ifa->lst_next;
2740 try_again:
2741 if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2742 ifa = inet6_addr_lst[state->bucket];
2743 goto try_again;
2744 }
2745 return ifa;
2746 }
2747
2748 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2749 {
2750 struct inet6_ifaddr *ifa = if6_get_first(seq);
2751
2752 if (ifa)
2753 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2754 --pos;
2755 return pos ? NULL : ifa;
2756 }
2757
2758 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2759 {
2760 read_lock_bh(&addrconf_hash_lock);
2761 return if6_get_idx(seq, *pos);
2762 }
2763
2764 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2765 {
2766 struct inet6_ifaddr *ifa;
2767
2768 ifa = if6_get_next(seq, v);
2769 ++*pos;
2770 return ifa;
2771 }
2772
2773 static void if6_seq_stop(struct seq_file *seq, void *v)
2774 {
2775 read_unlock_bh(&addrconf_hash_lock);
2776 }
2777
2778 static int if6_seq_show(struct seq_file *seq, void *v)
2779 {
2780 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2781 seq_printf(seq,
2782 NIP6_SEQFMT " %02x %02x %02x %02x %8s\n",
2783 NIP6(ifp->addr),
2784 ifp->idev->dev->ifindex,
2785 ifp->prefix_len,
2786 ifp->scope,
2787 ifp->flags,
2788 ifp->idev->dev->name);
2789 return 0;
2790 }
2791
2792 static const struct seq_operations if6_seq_ops = {
2793 .start = if6_seq_start,
2794 .next = if6_seq_next,
2795 .show = if6_seq_show,
2796 .stop = if6_seq_stop,
2797 };
2798
2799 static int if6_seq_open(struct inode *inode, struct file *file)
2800 {
2801 struct seq_file *seq;
2802 int rc = -ENOMEM;
2803 struct if6_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL);
2804
2805 if (!s)
2806 goto out;
2807
2808 rc = seq_open(file, &if6_seq_ops);
2809 if (rc)
2810 goto out_kfree;
2811
2812 seq = file->private_data;
2813 seq->private = s;
2814 out:
2815 return rc;
2816 out_kfree:
2817 kfree(s);
2818 goto out;
2819 }
2820
2821 static const struct file_operations if6_fops = {
2822 .owner = THIS_MODULE,
2823 .open = if6_seq_open,
2824 .read = seq_read,
2825 .llseek = seq_lseek,
2826 .release = seq_release_private,
2827 };
2828
2829 int __init if6_proc_init(void)
2830 {
2831 if (!proc_net_fops_create(&init_net, "if_inet6", S_IRUGO, &if6_fops))
2832 return -ENOMEM;
2833 return 0;
2834 }
2835
2836 void if6_proc_exit(void)
2837 {
2838 proc_net_remove(&init_net, "if_inet6");
2839 }
2840 #endif /* CONFIG_PROC_FS */
2841
2842 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
2843 /* Check if address is a home address configured on any interface. */
2844 int ipv6_chk_home_addr(struct in6_addr *addr)
2845 {
2846 int ret = 0;
2847 struct inet6_ifaddr * ifp;
2848 u8 hash = ipv6_addr_hash(addr);
2849 read_lock_bh(&addrconf_hash_lock);
2850 for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) {
2851 if (ipv6_addr_cmp(&ifp->addr, addr) == 0 &&
2852 (ifp->flags & IFA_F_HOMEADDRESS)) {
2853 ret = 1;
2854 break;
2855 }
2856 }
2857 read_unlock_bh(&addrconf_hash_lock);
2858 return ret;
2859 }
2860 #endif
2861
2862 /*
2863 * Periodic address status verification
2864 */
2865
2866 static void addrconf_verify(unsigned long foo)
2867 {
2868 struct inet6_ifaddr *ifp;
2869 unsigned long now, next;
2870 int i;
2871
2872 spin_lock_bh(&addrconf_verify_lock);
2873 now = jiffies;
2874 next = now + ADDR_CHECK_FREQUENCY;
2875
2876 del_timer(&addr_chk_timer);
2877
2878 for (i=0; i < IN6_ADDR_HSIZE; i++) {
2879
2880 restart:
2881 read_lock(&addrconf_hash_lock);
2882 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
2883 unsigned long age;
2884 #ifdef CONFIG_IPV6_PRIVACY
2885 unsigned long regen_advance;
2886 #endif
2887
2888 if (ifp->flags & IFA_F_PERMANENT)
2889 continue;
2890
2891 spin_lock(&ifp->lock);
2892 age = (now - ifp->tstamp) / HZ;
2893
2894 #ifdef CONFIG_IPV6_PRIVACY
2895 regen_advance = ifp->idev->cnf.regen_max_retry *
2896 ifp->idev->cnf.dad_transmits *
2897 ifp->idev->nd_parms->retrans_time / HZ;
2898 #endif
2899
2900 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
2901 age >= ifp->valid_lft) {
2902 spin_unlock(&ifp->lock);
2903 in6_ifa_hold(ifp);
2904 read_unlock(&addrconf_hash_lock);
2905 ipv6_del_addr(ifp);
2906 goto restart;
2907 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
2908 spin_unlock(&ifp->lock);
2909 continue;
2910 } else if (age >= ifp->prefered_lft) {
2911 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
2912 int deprecate = 0;
2913
2914 if (!(ifp->flags&IFA_F_DEPRECATED)) {
2915 deprecate = 1;
2916 ifp->flags |= IFA_F_DEPRECATED;
2917 }
2918
2919 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
2920 next = ifp->tstamp + ifp->valid_lft * HZ;
2921
2922 spin_unlock(&ifp->lock);
2923
2924 if (deprecate) {
2925 in6_ifa_hold(ifp);
2926 read_unlock(&addrconf_hash_lock);
2927
2928 ipv6_ifa_notify(0, ifp);
2929 in6_ifa_put(ifp);
2930 goto restart;
2931 }
2932 #ifdef CONFIG_IPV6_PRIVACY
2933 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
2934 !(ifp->flags&IFA_F_TENTATIVE)) {
2935 if (age >= ifp->prefered_lft - regen_advance) {
2936 struct inet6_ifaddr *ifpub = ifp->ifpub;
2937 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2938 next = ifp->tstamp + ifp->prefered_lft * HZ;
2939 if (!ifp->regen_count && ifpub) {
2940 ifp->regen_count++;
2941 in6_ifa_hold(ifp);
2942 in6_ifa_hold(ifpub);
2943 spin_unlock(&ifp->lock);
2944 read_unlock(&addrconf_hash_lock);
2945 spin_lock(&ifpub->lock);
2946 ifpub->regen_count = 0;
2947 spin_unlock(&ifpub->lock);
2948 ipv6_create_tempaddr(ifpub, ifp);
2949 in6_ifa_put(ifpub);
2950 in6_ifa_put(ifp);
2951 goto restart;
2952 }
2953 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
2954 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
2955 spin_unlock(&ifp->lock);
2956 #endif
2957 } else {
2958 /* ifp->prefered_lft <= ifp->valid_lft */
2959 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2960 next = ifp->tstamp + ifp->prefered_lft * HZ;
2961 spin_unlock(&ifp->lock);
2962 }
2963 }
2964 read_unlock(&addrconf_hash_lock);
2965 }
2966
2967 addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
2968 add_timer(&addr_chk_timer);
2969 spin_unlock_bh(&addrconf_verify_lock);
2970 }
2971
2972 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
2973 {
2974 struct in6_addr *pfx = NULL;
2975
2976 if (addr)
2977 pfx = nla_data(addr);
2978
2979 if (local) {
2980 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
2981 pfx = NULL;
2982 else
2983 pfx = nla_data(local);
2984 }
2985
2986 return pfx;
2987 }
2988
2989 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
2990 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
2991 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
2992 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
2993 };
2994
2995 static int
2996 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
2997 {
2998 struct ifaddrmsg *ifm;
2999 struct nlattr *tb[IFA_MAX+1];
3000 struct in6_addr *pfx;
3001 int err;
3002
3003 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3004 if (err < 0)
3005 return err;
3006
3007 ifm = nlmsg_data(nlh);
3008 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3009 if (pfx == NULL)
3010 return -EINVAL;
3011
3012 return inet6_addr_del(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3013 }
3014
3015 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3016 u32 prefered_lft, u32 valid_lft)
3017 {
3018 u32 flags = RTF_EXPIRES;
3019
3020 if (!valid_lft || (prefered_lft > valid_lft))
3021 return -EINVAL;
3022
3023 if (valid_lft == INFINITY_LIFE_TIME) {
3024 ifa_flags |= IFA_F_PERMANENT;
3025 flags = 0;
3026 } else if (valid_lft >= 0x7FFFFFFF/HZ)
3027 valid_lft = 0x7FFFFFFF/HZ;
3028
3029 if (prefered_lft == 0)
3030 ifa_flags |= IFA_F_DEPRECATED;
3031 else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
3032 (prefered_lft != INFINITY_LIFE_TIME))
3033 prefered_lft = 0x7FFFFFFF/HZ;
3034
3035 spin_lock_bh(&ifp->lock);
3036 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3037 ifp->tstamp = jiffies;
3038 ifp->valid_lft = valid_lft;
3039 ifp->prefered_lft = prefered_lft;
3040
3041 spin_unlock_bh(&ifp->lock);
3042 if (!(ifp->flags&IFA_F_TENTATIVE))
3043 ipv6_ifa_notify(0, ifp);
3044
3045 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3046 jiffies_to_clock_t(valid_lft * HZ), flags);
3047 addrconf_verify(0);
3048
3049 return 0;
3050 }
3051
3052 static int
3053 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3054 {
3055 struct ifaddrmsg *ifm;
3056 struct nlattr *tb[IFA_MAX+1];
3057 struct in6_addr *pfx;
3058 struct inet6_ifaddr *ifa;
3059 struct net_device *dev;
3060 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3061 u8 ifa_flags;
3062 int err;
3063
3064 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3065 if (err < 0)
3066 return err;
3067
3068 ifm = nlmsg_data(nlh);
3069 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3070 if (pfx == NULL)
3071 return -EINVAL;
3072
3073 if (tb[IFA_CACHEINFO]) {
3074 struct ifa_cacheinfo *ci;
3075
3076 ci = nla_data(tb[IFA_CACHEINFO]);
3077 valid_lft = ci->ifa_valid;
3078 preferred_lft = ci->ifa_prefered;
3079 } else {
3080 preferred_lft = INFINITY_LIFE_TIME;
3081 valid_lft = INFINITY_LIFE_TIME;
3082 }
3083
3084 dev = __dev_get_by_index(ifm->ifa_index);
3085 if (dev == NULL)
3086 return -ENODEV;
3087
3088 /* We ignore other flags so far. */
3089 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3090
3091 ifa = ipv6_get_ifaddr(pfx, dev, 1);
3092 if (ifa == NULL) {
3093 /*
3094 * It would be best to check for !NLM_F_CREATE here but
3095 * userspace alreay relies on not having to provide this.
3096 */
3097 return inet6_addr_add(ifm->ifa_index, pfx, ifm->ifa_prefixlen,
3098 ifa_flags, preferred_lft, valid_lft);
3099 }
3100
3101 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3102 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3103 err = -EEXIST;
3104 else
3105 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3106
3107 in6_ifa_put(ifa);
3108
3109 return err;
3110 }
3111
3112 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3113 u8 scope, int ifindex)
3114 {
3115 struct ifaddrmsg *ifm;
3116
3117 ifm = nlmsg_data(nlh);
3118 ifm->ifa_family = AF_INET6;
3119 ifm->ifa_prefixlen = prefixlen;
3120 ifm->ifa_flags = flags;
3121 ifm->ifa_scope = scope;
3122 ifm->ifa_index = ifindex;
3123 }
3124
3125 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3126 unsigned long tstamp, u32 preferred, u32 valid)
3127 {
3128 struct ifa_cacheinfo ci;
3129
3130 ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3131 + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3132 ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3133 + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3134 ci.ifa_prefered = preferred;
3135 ci.ifa_valid = valid;
3136
3137 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3138 }
3139
3140 static inline int rt_scope(int ifa_scope)
3141 {
3142 if (ifa_scope & IFA_HOST)
3143 return RT_SCOPE_HOST;
3144 else if (ifa_scope & IFA_LINK)
3145 return RT_SCOPE_LINK;
3146 else if (ifa_scope & IFA_SITE)
3147 return RT_SCOPE_SITE;
3148 else
3149 return RT_SCOPE_UNIVERSE;
3150 }
3151
3152 static inline int inet6_ifaddr_msgsize(void)
3153 {
3154 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3155 + nla_total_size(16) /* IFA_ADDRESS */
3156 + nla_total_size(sizeof(struct ifa_cacheinfo));
3157 }
3158
3159 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3160 u32 pid, u32 seq, int event, unsigned int flags)
3161 {
3162 struct nlmsghdr *nlh;
3163 u32 preferred, valid;
3164
3165 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3166 if (nlh == NULL)
3167 return -EMSGSIZE;
3168
3169 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3170 ifa->idev->dev->ifindex);
3171
3172 if (!(ifa->flags&IFA_F_PERMANENT)) {
3173 preferred = ifa->prefered_lft;
3174 valid = ifa->valid_lft;
3175 if (preferred != INFINITY_LIFE_TIME) {
3176 long tval = (jiffies - ifa->tstamp)/HZ;
3177 preferred -= tval;
3178 if (valid != INFINITY_LIFE_TIME)
3179 valid -= tval;
3180 }
3181 } else {
3182 preferred = INFINITY_LIFE_TIME;
3183 valid = INFINITY_LIFE_TIME;
3184 }
3185
3186 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3187 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3188 nlmsg_cancel(skb, nlh);
3189 return -EMSGSIZE;
3190 }
3191
3192 return nlmsg_end(skb, nlh);
3193 }
3194
3195 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3196 u32 pid, u32 seq, int event, u16 flags)
3197 {
3198 struct nlmsghdr *nlh;
3199 u8 scope = RT_SCOPE_UNIVERSE;
3200 int ifindex = ifmca->idev->dev->ifindex;
3201
3202 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3203 scope = RT_SCOPE_SITE;
3204
3205 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3206 if (nlh == NULL)
3207 return -EMSGSIZE;
3208
3209 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3210 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3211 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3212 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3213 nlmsg_cancel(skb, nlh);
3214 return -EMSGSIZE;
3215 }
3216
3217 return nlmsg_end(skb, nlh);
3218 }
3219
3220 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3221 u32 pid, u32 seq, int event, unsigned int flags)
3222 {
3223 struct nlmsghdr *nlh;
3224 u8 scope = RT_SCOPE_UNIVERSE;
3225 int ifindex = ifaca->aca_idev->dev->ifindex;
3226
3227 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3228 scope = RT_SCOPE_SITE;
3229
3230 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3231 if (nlh == NULL)
3232 return -EMSGSIZE;
3233
3234 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3235 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3236 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3237 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3238 nlmsg_cancel(skb, nlh);
3239 return -EMSGSIZE;
3240 }
3241
3242 return nlmsg_end(skb, nlh);
3243 }
3244
3245 enum addr_type_t
3246 {
3247 UNICAST_ADDR,
3248 MULTICAST_ADDR,
3249 ANYCAST_ADDR,
3250 };
3251
3252 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3253 enum addr_type_t type)
3254 {
3255 int idx, ip_idx;
3256 int s_idx, s_ip_idx;
3257 int err = 1;
3258 struct net_device *dev;
3259 struct inet6_dev *idev = NULL;
3260 struct inet6_ifaddr *ifa;
3261 struct ifmcaddr6 *ifmca;
3262 struct ifacaddr6 *ifaca;
3263
3264 s_idx = cb->args[0];
3265 s_ip_idx = ip_idx = cb->args[1];
3266
3267 idx = 0;
3268 for_each_netdev(dev) {
3269 if (idx < s_idx)
3270 goto cont;
3271 if (idx > s_idx)
3272 s_ip_idx = 0;
3273 ip_idx = 0;
3274 if ((idev = in6_dev_get(dev)) == NULL)
3275 goto cont;
3276 read_lock_bh(&idev->lock);
3277 switch (type) {
3278 case UNICAST_ADDR:
3279 /* unicast address incl. temp addr */
3280 for (ifa = idev->addr_list; ifa;
3281 ifa = ifa->if_next, ip_idx++) {
3282 if (ip_idx < s_ip_idx)
3283 continue;
3284 if ((err = inet6_fill_ifaddr(skb, ifa,
3285 NETLINK_CB(cb->skb).pid,
3286 cb->nlh->nlmsg_seq, RTM_NEWADDR,
3287 NLM_F_MULTI)) <= 0)
3288 goto done;
3289 }
3290 break;
3291 case MULTICAST_ADDR:
3292 /* multicast address */
3293 for (ifmca = idev->mc_list; ifmca;
3294 ifmca = ifmca->next, ip_idx++) {
3295 if (ip_idx < s_ip_idx)
3296 continue;
3297 if ((err = inet6_fill_ifmcaddr(skb, ifmca,
3298 NETLINK_CB(cb->skb).pid,
3299 cb->nlh->nlmsg_seq, RTM_GETMULTICAST,
3300 NLM_F_MULTI)) <= 0)
3301 goto done;
3302 }
3303 break;
3304 case ANYCAST_ADDR:
3305 /* anycast address */
3306 for (ifaca = idev->ac_list; ifaca;
3307 ifaca = ifaca->aca_next, ip_idx++) {
3308 if (ip_idx < s_ip_idx)
3309 continue;
3310 if ((err = inet6_fill_ifacaddr(skb, ifaca,
3311 NETLINK_CB(cb->skb).pid,
3312 cb->nlh->nlmsg_seq, RTM_GETANYCAST,
3313 NLM_F_MULTI)) <= 0)
3314 goto done;
3315 }
3316 break;
3317 default:
3318 break;
3319 }
3320 read_unlock_bh(&idev->lock);
3321 in6_dev_put(idev);
3322 cont:
3323 idx++;
3324 }
3325 done:
3326 if (err <= 0) {
3327 read_unlock_bh(&idev->lock);
3328 in6_dev_put(idev);
3329 }
3330 cb->args[0] = idx;
3331 cb->args[1] = ip_idx;
3332 return skb->len;
3333 }
3334
3335 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3336 {
3337 enum addr_type_t type = UNICAST_ADDR;
3338 return inet6_dump_addr(skb, cb, type);
3339 }
3340
3341 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3342 {
3343 enum addr_type_t type = MULTICAST_ADDR;
3344 return inet6_dump_addr(skb, cb, type);
3345 }
3346
3347
3348 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3349 {
3350 enum addr_type_t type = ANYCAST_ADDR;
3351 return inet6_dump_addr(skb, cb, type);
3352 }
3353
3354 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3355 void *arg)
3356 {
3357 struct ifaddrmsg *ifm;
3358 struct nlattr *tb[IFA_MAX+1];
3359 struct in6_addr *addr = NULL;
3360 struct net_device *dev = NULL;
3361 struct inet6_ifaddr *ifa;
3362 struct sk_buff *skb;
3363 int err;
3364
3365 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3366 if (err < 0)
3367 goto errout;
3368
3369 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3370 if (addr == NULL) {
3371 err = -EINVAL;
3372 goto errout;
3373 }
3374
3375 ifm = nlmsg_data(nlh);
3376 if (ifm->ifa_index)
3377 dev = __dev_get_by_index(ifm->ifa_index);
3378
3379 if ((ifa = ipv6_get_ifaddr(addr, dev, 1)) == NULL) {
3380 err = -EADDRNOTAVAIL;
3381 goto errout;
3382 }
3383
3384 if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) {
3385 err = -ENOBUFS;
3386 goto errout_ifa;
3387 }
3388
3389 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3390 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3391 if (err < 0) {
3392 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3393 WARN_ON(err == -EMSGSIZE);
3394 kfree_skb(skb);
3395 goto errout_ifa;
3396 }
3397 err = rtnl_unicast(skb, NETLINK_CB(in_skb).pid);
3398 errout_ifa:
3399 in6_ifa_put(ifa);
3400 errout:
3401 return err;
3402 }
3403
3404 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3405 {
3406 struct sk_buff *skb;
3407 int err = -ENOBUFS;
3408
3409 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3410 if (skb == NULL)
3411 goto errout;
3412
3413 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3414 if (err < 0) {
3415 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3416 WARN_ON(err == -EMSGSIZE);
3417 kfree_skb(skb);
3418 goto errout;
3419 }
3420 err = rtnl_notify(skb, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3421 errout:
3422 if (err < 0)
3423 rtnl_set_sk_err(RTNLGRP_IPV6_IFADDR, err);
3424 }
3425
3426 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3427 __s32 *array, int bytes)
3428 {
3429 BUG_ON(bytes < (DEVCONF_MAX * 4));
3430
3431 memset(array, 0, bytes);
3432 array[DEVCONF_FORWARDING] = cnf->forwarding;
3433 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3434 array[DEVCONF_MTU6] = cnf->mtu6;
3435 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3436 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3437 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3438 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3439 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3440 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3441 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3442 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3443 #ifdef CONFIG_IPV6_PRIVACY
3444 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3445 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3446 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3447 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3448 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3449 #endif
3450 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3451 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3452 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3453 #ifdef CONFIG_IPV6_ROUTER_PREF
3454 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3455 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
3456 #ifdef CONFIG_IPV6_ROUTE_INFO
3457 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3458 #endif
3459 #endif
3460 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3461 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3462 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3463 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3464 #endif
3465 }
3466
3467 static inline size_t inet6_if_nlmsg_size(void)
3468 {
3469 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3470 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3471 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3472 + nla_total_size(4) /* IFLA_MTU */
3473 + nla_total_size(4) /* IFLA_LINK */
3474 + nla_total_size( /* IFLA_PROTINFO */
3475 nla_total_size(4) /* IFLA_INET6_FLAGS */
3476 + nla_total_size(sizeof(struct ifla_cacheinfo))
3477 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3478 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3479 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
3480 );
3481 }
3482
3483 static inline void __snmp6_fill_stats(u64 *stats, void **mib, int items,
3484 int bytes)
3485 {
3486 int i;
3487 int pad = bytes - sizeof(u64) * items;
3488 BUG_ON(pad < 0);
3489
3490 /* Use put_unaligned() because stats may not be aligned for u64. */
3491 put_unaligned(items, &stats[0]);
3492 for (i = 1; i < items; i++)
3493 put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3494
3495 memset(&stats[items], 0, pad);
3496 }
3497
3498 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3499 int bytes)
3500 {
3501 switch(attrtype) {
3502 case IFLA_INET6_STATS:
3503 __snmp6_fill_stats(stats, (void **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes);
3504 break;
3505 case IFLA_INET6_ICMP6STATS:
3506 __snmp6_fill_stats(stats, (void **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
3507 break;
3508 }
3509 }
3510
3511 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3512 u32 pid, u32 seq, int event, unsigned int flags)
3513 {
3514 struct net_device *dev = idev->dev;
3515 struct nlattr *nla;
3516 struct ifinfomsg *hdr;
3517 struct nlmsghdr *nlh;
3518 void *protoinfo;
3519 struct ifla_cacheinfo ci;
3520
3521 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3522 if (nlh == NULL)
3523 return -EMSGSIZE;
3524
3525 hdr = nlmsg_data(nlh);
3526 hdr->ifi_family = AF_INET6;
3527 hdr->__ifi_pad = 0;
3528 hdr->ifi_type = dev->type;
3529 hdr->ifi_index = dev->ifindex;
3530 hdr->ifi_flags = dev_get_flags(dev);
3531 hdr->ifi_change = 0;
3532
3533 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
3534
3535 if (dev->addr_len)
3536 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3537
3538 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
3539 if (dev->ifindex != dev->iflink)
3540 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
3541
3542 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3543 if (protoinfo == NULL)
3544 goto nla_put_failure;
3545
3546 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
3547
3548 ci.max_reasm_len = IPV6_MAXPLEN;
3549 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3550 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3551 ci.reachable_time = idev->nd_parms->reachable_time;
3552 ci.retrans_time = idev->nd_parms->retrans_time;
3553 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3554
3555 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3556 if (nla == NULL)
3557 goto nla_put_failure;
3558 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
3559
3560 /* XXX - MC not implemented */
3561
3562 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3563 if (nla == NULL)
3564 goto nla_put_failure;
3565 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3566
3567 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3568 if (nla == NULL)
3569 goto nla_put_failure;
3570 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
3571
3572 nla_nest_end(skb, protoinfo);
3573 return nlmsg_end(skb, nlh);
3574
3575 nla_put_failure:
3576 nlmsg_cancel(skb, nlh);
3577 return -EMSGSIZE;
3578 }
3579
3580 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3581 {
3582 int idx, err;
3583 int s_idx = cb->args[0];
3584 struct net_device *dev;
3585 struct inet6_dev *idev;
3586
3587 read_lock(&dev_base_lock);
3588 idx = 0;
3589 for_each_netdev(dev) {
3590 if (idx < s_idx)
3591 goto cont;
3592 if ((idev = in6_dev_get(dev)) == NULL)
3593 goto cont;
3594 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
3595 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
3596 in6_dev_put(idev);
3597 if (err <= 0)
3598 break;
3599 cont:
3600 idx++;
3601 }
3602 read_unlock(&dev_base_lock);
3603 cb->args[0] = idx;
3604
3605 return skb->len;
3606 }
3607
3608 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3609 {
3610 struct sk_buff *skb;
3611 int err = -ENOBUFS;
3612
3613 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
3614 if (skb == NULL)
3615 goto errout;
3616
3617 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
3618 if (err < 0) {
3619 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3620 WARN_ON(err == -EMSGSIZE);
3621 kfree_skb(skb);
3622 goto errout;
3623 }
3624 err = rtnl_notify(skb, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3625 errout:
3626 if (err < 0)
3627 rtnl_set_sk_err(RTNLGRP_IPV6_IFADDR, err);
3628 }
3629
3630 static inline size_t inet6_prefix_nlmsg_size(void)
3631 {
3632 return NLMSG_ALIGN(sizeof(struct prefixmsg))
3633 + nla_total_size(sizeof(struct in6_addr))
3634 + nla_total_size(sizeof(struct prefix_cacheinfo));
3635 }
3636
3637 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
3638 struct prefix_info *pinfo, u32 pid, u32 seq,
3639 int event, unsigned int flags)
3640 {
3641 struct prefixmsg *pmsg;
3642 struct nlmsghdr *nlh;
3643 struct prefix_cacheinfo ci;
3644
3645 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
3646 if (nlh == NULL)
3647 return -EMSGSIZE;
3648
3649 pmsg = nlmsg_data(nlh);
3650 pmsg->prefix_family = AF_INET6;
3651 pmsg->prefix_pad1 = 0;
3652 pmsg->prefix_pad2 = 0;
3653 pmsg->prefix_ifindex = idev->dev->ifindex;
3654 pmsg->prefix_len = pinfo->prefix_len;
3655 pmsg->prefix_type = pinfo->type;
3656 pmsg->prefix_pad3 = 0;
3657 pmsg->prefix_flags = 0;
3658 if (pinfo->onlink)
3659 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3660 if (pinfo->autoconf)
3661 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3662
3663 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
3664
3665 ci.preferred_time = ntohl(pinfo->prefered);
3666 ci.valid_time = ntohl(pinfo->valid);
3667 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
3668
3669 return nlmsg_end(skb, nlh);
3670
3671 nla_put_failure:
3672 nlmsg_cancel(skb, nlh);
3673 return -EMSGSIZE;
3674 }
3675
3676 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
3677 struct prefix_info *pinfo)
3678 {
3679 struct sk_buff *skb;
3680 int err = -ENOBUFS;
3681
3682 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
3683 if (skb == NULL)
3684 goto errout;
3685
3686 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
3687 if (err < 0) {
3688 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
3689 WARN_ON(err == -EMSGSIZE);
3690 kfree_skb(skb);
3691 goto errout;
3692 }
3693 err = rtnl_notify(skb, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
3694 errout:
3695 if (err < 0)
3696 rtnl_set_sk_err(RTNLGRP_IPV6_PREFIX, err);
3697 }
3698
3699 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3700 {
3701 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3702
3703 switch (event) {
3704 case RTM_NEWADDR:
3705 /*
3706 * If the address was optimistic
3707 * we inserted the route at the start of
3708 * our DAD process, so we don't need
3709 * to do it again
3710 */
3711 if (!(ifp->rt->rt6i_node))
3712 ip6_ins_rt(ifp->rt);
3713 if (ifp->idev->cnf.forwarding)
3714 addrconf_join_anycast(ifp);
3715 break;
3716 case RTM_DELADDR:
3717 if (ifp->idev->cnf.forwarding)
3718 addrconf_leave_anycast(ifp);
3719 addrconf_leave_solict(ifp->idev, &ifp->addr);
3720 dst_hold(&ifp->rt->u.dst);
3721 if (ip6_del_rt(ifp->rt))
3722 dst_free(&ifp->rt->u.dst);
3723 break;
3724 }
3725 }
3726
3727 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3728 {
3729 rcu_read_lock_bh();
3730 if (likely(ifp->idev->dead == 0))
3731 __ipv6_ifa_notify(event, ifp);
3732 rcu_read_unlock_bh();
3733 }
3734
3735 #ifdef CONFIG_SYSCTL
3736
3737 static
3738 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3739 void __user *buffer, size_t *lenp, loff_t *ppos)
3740 {
3741 int *valp = ctl->data;
3742 int val = *valp;
3743 int ret;
3744
3745 ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3746
3747 if (write && valp != &ipv6_devconf_dflt.forwarding) {
3748 if (valp != &ipv6_devconf.forwarding) {
3749 if ((!*valp) ^ (!val)) {
3750 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
3751 if (idev == NULL)
3752 return ret;
3753 dev_forward_change(idev);
3754 }
3755 } else {
3756 ipv6_devconf_dflt.forwarding = ipv6_devconf.forwarding;
3757 addrconf_forward_change();
3758 }
3759 if (*valp)
3760 rt6_purge_dflt_routers();
3761 }
3762
3763 return ret;
3764 }
3765
3766 static int addrconf_sysctl_forward_strategy(ctl_table *table,
3767 int __user *name, int nlen,
3768 void __user *oldval,
3769 size_t __user *oldlenp,
3770 void __user *newval, size_t newlen)
3771 {
3772 int *valp = table->data;
3773 int new;
3774
3775 if (!newval || !newlen)
3776 return 0;
3777 if (newlen != sizeof(int))
3778 return -EINVAL;
3779 if (get_user(new, (int __user *)newval))
3780 return -EFAULT;
3781 if (new == *valp)
3782 return 0;
3783 if (oldval && oldlenp) {
3784 size_t len;
3785 if (get_user(len, oldlenp))
3786 return -EFAULT;
3787 if (len) {
3788 if (len > table->maxlen)
3789 len = table->maxlen;
3790 if (copy_to_user(oldval, valp, len))
3791 return -EFAULT;
3792 if (put_user(len, oldlenp))
3793 return -EFAULT;
3794 }
3795 }
3796
3797 if (valp != &ipv6_devconf_dflt.forwarding) {
3798 if (valp != &ipv6_devconf.forwarding) {
3799 struct inet6_dev *idev = (struct inet6_dev *)table->extra1;
3800 int changed;
3801 if (unlikely(idev == NULL))
3802 return -ENODEV;
3803 changed = (!*valp) ^ (!new);
3804 *valp = new;
3805 if (changed)
3806 dev_forward_change(idev);
3807 } else {
3808 *valp = new;
3809 addrconf_forward_change();
3810 }
3811
3812 if (*valp)
3813 rt6_purge_dflt_routers();
3814 } else
3815 *valp = new;
3816
3817 return 1;
3818 }
3819
3820 static struct addrconf_sysctl_table
3821 {
3822 struct ctl_table_header *sysctl_header;
3823 ctl_table addrconf_vars[__NET_IPV6_MAX];
3824 ctl_table addrconf_dev[2];
3825 ctl_table addrconf_conf_dir[2];
3826 ctl_table addrconf_proto_dir[2];
3827 ctl_table addrconf_root_dir[2];
3828 } addrconf_sysctl __read_mostly = {
3829 .sysctl_header = NULL,
3830 .addrconf_vars = {
3831 {
3832 .ctl_name = NET_IPV6_FORWARDING,
3833 .procname = "forwarding",
3834 .data = &ipv6_devconf.forwarding,
3835 .maxlen = sizeof(int),
3836 .mode = 0644,
3837 .proc_handler = &addrconf_sysctl_forward,
3838 .strategy = &addrconf_sysctl_forward_strategy,
3839 },
3840 {
3841 .ctl_name = NET_IPV6_HOP_LIMIT,
3842 .procname = "hop_limit",
3843 .data = &ipv6_devconf.hop_limit,
3844 .maxlen = sizeof(int),
3845 .mode = 0644,
3846 .proc_handler = proc_dointvec,
3847 },
3848 {
3849 .ctl_name = NET_IPV6_MTU,
3850 .procname = "mtu",
3851 .data = &ipv6_devconf.mtu6,
3852 .maxlen = sizeof(int),
3853 .mode = 0644,
3854 .proc_handler = &proc_dointvec,
3855 },
3856 {
3857 .ctl_name = NET_IPV6_ACCEPT_RA,
3858 .procname = "accept_ra",
3859 .data = &ipv6_devconf.accept_ra,
3860 .maxlen = sizeof(int),
3861 .mode = 0644,
3862 .proc_handler = &proc_dointvec,
3863 },
3864 {
3865 .ctl_name = NET_IPV6_ACCEPT_REDIRECTS,
3866 .procname = "accept_redirects",
3867 .data = &ipv6_devconf.accept_redirects,
3868 .maxlen = sizeof(int),
3869 .mode = 0644,
3870 .proc_handler = &proc_dointvec,
3871 },
3872 {
3873 .ctl_name = NET_IPV6_AUTOCONF,
3874 .procname = "autoconf",
3875 .data = &ipv6_devconf.autoconf,
3876 .maxlen = sizeof(int),
3877 .mode = 0644,
3878 .proc_handler = &proc_dointvec,
3879 },
3880 {
3881 .ctl_name = NET_IPV6_DAD_TRANSMITS,
3882 .procname = "dad_transmits",
3883 .data = &ipv6_devconf.dad_transmits,
3884 .maxlen = sizeof(int),
3885 .mode = 0644,
3886 .proc_handler = &proc_dointvec,
3887 },
3888 {
3889 .ctl_name = NET_IPV6_RTR_SOLICITS,
3890 .procname = "router_solicitations",
3891 .data = &ipv6_devconf.rtr_solicits,
3892 .maxlen = sizeof(int),
3893 .mode = 0644,
3894 .proc_handler = &proc_dointvec,
3895 },
3896 {
3897 .ctl_name = NET_IPV6_RTR_SOLICIT_INTERVAL,
3898 .procname = "router_solicitation_interval",
3899 .data = &ipv6_devconf.rtr_solicit_interval,
3900 .maxlen = sizeof(int),
3901 .mode = 0644,
3902 .proc_handler = &proc_dointvec_jiffies,
3903 .strategy = &sysctl_jiffies,
3904 },
3905 {
3906 .ctl_name = NET_IPV6_RTR_SOLICIT_DELAY,
3907 .procname = "router_solicitation_delay",
3908 .data = &ipv6_devconf.rtr_solicit_delay,
3909 .maxlen = sizeof(int),
3910 .mode = 0644,
3911 .proc_handler = &proc_dointvec_jiffies,
3912 .strategy = &sysctl_jiffies,
3913 },
3914 {
3915 .ctl_name = NET_IPV6_FORCE_MLD_VERSION,
3916 .procname = "force_mld_version",
3917 .data = &ipv6_devconf.force_mld_version,
3918 .maxlen = sizeof(int),
3919 .mode = 0644,
3920 .proc_handler = &proc_dointvec,
3921 },
3922 #ifdef CONFIG_IPV6_PRIVACY
3923 {
3924 .ctl_name = NET_IPV6_USE_TEMPADDR,
3925 .procname = "use_tempaddr",
3926 .data = &ipv6_devconf.use_tempaddr,
3927 .maxlen = sizeof(int),
3928 .mode = 0644,
3929 .proc_handler = &proc_dointvec,
3930 },
3931 {
3932 .ctl_name = NET_IPV6_TEMP_VALID_LFT,
3933 .procname = "temp_valid_lft",
3934 .data = &ipv6_devconf.temp_valid_lft,
3935 .maxlen = sizeof(int),
3936 .mode = 0644,
3937 .proc_handler = &proc_dointvec,
3938 },
3939 {
3940 .ctl_name = NET_IPV6_TEMP_PREFERED_LFT,
3941 .procname = "temp_prefered_lft",
3942 .data = &ipv6_devconf.temp_prefered_lft,
3943 .maxlen = sizeof(int),
3944 .mode = 0644,
3945 .proc_handler = &proc_dointvec,
3946 },
3947 {
3948 .ctl_name = NET_IPV6_REGEN_MAX_RETRY,
3949 .procname = "regen_max_retry",
3950 .data = &ipv6_devconf.regen_max_retry,
3951 .maxlen = sizeof(int),
3952 .mode = 0644,
3953 .proc_handler = &proc_dointvec,
3954 },
3955 {
3956 .ctl_name = NET_IPV6_MAX_DESYNC_FACTOR,
3957 .procname = "max_desync_factor",
3958 .data = &ipv6_devconf.max_desync_factor,
3959 .maxlen = sizeof(int),
3960 .mode = 0644,
3961 .proc_handler = &proc_dointvec,
3962 },
3963 #endif
3964 {
3965 .ctl_name = NET_IPV6_MAX_ADDRESSES,
3966 .procname = "max_addresses",
3967 .data = &ipv6_devconf.max_addresses,
3968 .maxlen = sizeof(int),
3969 .mode = 0644,
3970 .proc_handler = &proc_dointvec,
3971 },
3972 {
3973 .ctl_name = NET_IPV6_ACCEPT_RA_DEFRTR,
3974 .procname = "accept_ra_defrtr",
3975 .data = &ipv6_devconf.accept_ra_defrtr,
3976 .maxlen = sizeof(int),
3977 .mode = 0644,
3978 .proc_handler = &proc_dointvec,
3979 },
3980 {
3981 .ctl_name = NET_IPV6_ACCEPT_RA_PINFO,
3982 .procname = "accept_ra_pinfo",
3983 .data = &ipv6_devconf.accept_ra_pinfo,
3984 .maxlen = sizeof(int),
3985 .mode = 0644,
3986 .proc_handler = &proc_dointvec,
3987 },
3988 #ifdef CONFIG_IPV6_ROUTER_PREF
3989 {
3990 .ctl_name = NET_IPV6_ACCEPT_RA_RTR_PREF,
3991 .procname = "accept_ra_rtr_pref",
3992 .data = &ipv6_devconf.accept_ra_rtr_pref,
3993 .maxlen = sizeof(int),
3994 .mode = 0644,
3995 .proc_handler = &proc_dointvec,
3996 },
3997 {
3998 .ctl_name = NET_IPV6_RTR_PROBE_INTERVAL,
3999 .procname = "router_probe_interval",
4000 .data = &ipv6_devconf.rtr_probe_interval,
4001 .maxlen = sizeof(int),
4002 .mode = 0644,
4003 .proc_handler = &proc_dointvec_jiffies,
4004 .strategy = &sysctl_jiffies,
4005 },
4006 #ifdef CONFIG_IPV6_ROUTE_INFO
4007 {
4008 .ctl_name = NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN,
4009 .procname = "accept_ra_rt_info_max_plen",
4010 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4011 .maxlen = sizeof(int),
4012 .mode = 0644,
4013 .proc_handler = &proc_dointvec,
4014 },
4015 #endif
4016 #endif
4017 {
4018 .ctl_name = NET_IPV6_PROXY_NDP,
4019 .procname = "proxy_ndp",
4020 .data = &ipv6_devconf.proxy_ndp,
4021 .maxlen = sizeof(int),
4022 .mode = 0644,
4023 .proc_handler = &proc_dointvec,
4024 },
4025 {
4026 .ctl_name = NET_IPV6_ACCEPT_SOURCE_ROUTE,
4027 .procname = "accept_source_route",
4028 .data = &ipv6_devconf.accept_source_route,
4029 .maxlen = sizeof(int),
4030 .mode = 0644,
4031 .proc_handler = &proc_dointvec,
4032 },
4033 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4034 {
4035 .ctl_name = CTL_UNNUMBERED,
4036 .procname = "optimistic_dad",
4037 .data = &ipv6_devconf.optimistic_dad,
4038 .maxlen = sizeof(int),
4039 .mode = 0644,
4040 .proc_handler = &proc_dointvec,
4041
4042 },
4043 #endif
4044 {
4045 .ctl_name = 0, /* sentinel */
4046 }
4047 },
4048 .addrconf_dev = {
4049 {
4050 .ctl_name = NET_PROTO_CONF_ALL,
4051 .procname = "all",
4052 .mode = 0555,
4053 .child = addrconf_sysctl.addrconf_vars,
4054 },
4055 {
4056 .ctl_name = 0, /* sentinel */
4057 }
4058 },
4059 .addrconf_conf_dir = {
4060 {
4061 .ctl_name = NET_IPV6_CONF,
4062 .procname = "conf",
4063 .mode = 0555,
4064 .child = addrconf_sysctl.addrconf_dev,
4065 },
4066 {
4067 .ctl_name = 0, /* sentinel */
4068 }
4069 },
4070 .addrconf_proto_dir = {
4071 {
4072 .ctl_name = NET_IPV6,
4073 .procname = "ipv6",
4074 .mode = 0555,
4075 .child = addrconf_sysctl.addrconf_conf_dir,
4076 },
4077 {
4078 .ctl_name = 0, /* sentinel */
4079 }
4080 },
4081 .addrconf_root_dir = {
4082 {
4083 .ctl_name = CTL_NET,
4084 .procname = "net",
4085 .mode = 0555,
4086 .child = addrconf_sysctl.addrconf_proto_dir,
4087 },
4088 {
4089 .ctl_name = 0, /* sentinel */
4090 }
4091 },
4092 };
4093
4094 static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p)
4095 {
4096 int i;
4097 struct net_device *dev = idev ? idev->dev : NULL;
4098 struct addrconf_sysctl_table *t;
4099 char *dev_name = NULL;
4100
4101 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4102 if (t == NULL)
4103 return;
4104 for (i=0; t->addrconf_vars[i].data; i++) {
4105 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
4106 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4107 }
4108 if (dev) {
4109 dev_name = dev->name;
4110 t->addrconf_dev[0].ctl_name = dev->ifindex;
4111 } else {
4112 dev_name = "default";
4113 t->addrconf_dev[0].ctl_name = NET_PROTO_CONF_DEFAULT;
4114 }
4115
4116 /*
4117 * Make a copy of dev_name, because '.procname' is regarded as const
4118 * by sysctl and we wouldn't want anyone to change it under our feet
4119 * (see SIOCSIFNAME).
4120 */
4121 dev_name = kstrdup(dev_name, GFP_KERNEL);
4122 if (!dev_name)
4123 goto free;
4124
4125 t->addrconf_dev[0].procname = dev_name;
4126
4127 t->addrconf_dev[0].child = t->addrconf_vars;
4128 t->addrconf_conf_dir[0].child = t->addrconf_dev;
4129 t->addrconf_proto_dir[0].child = t->addrconf_conf_dir;
4130 t->addrconf_root_dir[0].child = t->addrconf_proto_dir;
4131
4132 t->sysctl_header = register_sysctl_table(t->addrconf_root_dir);
4133 if (t->sysctl_header == NULL)
4134 goto free_procname;
4135 else
4136 p->sysctl = t;
4137 return;
4138
4139 /* error path */
4140 free_procname:
4141 kfree(dev_name);
4142 free:
4143 kfree(t);
4144
4145 return;
4146 }
4147
4148 static void addrconf_sysctl_unregister(struct ipv6_devconf *p)
4149 {
4150 if (p->sysctl) {
4151 struct addrconf_sysctl_table *t = p->sysctl;
4152 p->sysctl = NULL;
4153 unregister_sysctl_table(t->sysctl_header);
4154 kfree(t->addrconf_dev[0].procname);
4155 kfree(t);
4156 }
4157 }
4158
4159
4160 #endif
4161
4162 /*
4163 * Device notifier
4164 */
4165
4166 int register_inet6addr_notifier(struct notifier_block *nb)
4167 {
4168 return atomic_notifier_chain_register(&inet6addr_chain, nb);
4169 }
4170
4171 EXPORT_SYMBOL(register_inet6addr_notifier);
4172
4173 int unregister_inet6addr_notifier(struct notifier_block *nb)
4174 {
4175 return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
4176 }
4177
4178 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4179
4180 /*
4181 * Init / cleanup code
4182 */
4183
4184 int __init addrconf_init(void)
4185 {
4186 int err = 0;
4187
4188 /* The addrconf netdev notifier requires that loopback_dev
4189 * has it's ipv6 private information allocated and setup
4190 * before it can bring up and give link-local addresses
4191 * to other devices which are up.
4192 *
4193 * Unfortunately, loopback_dev is not necessarily the first
4194 * entry in the global dev_base list of net devices. In fact,
4195 * it is likely to be the very last entry on that list.
4196 * So this causes the notifier registry below to try and
4197 * give link-local addresses to all devices besides loopback_dev
4198 * first, then loopback_dev, which cases all the non-loopback_dev
4199 * devices to fail to get a link-local address.
4200 *
4201 * So, as a temporary fix, allocate the ipv6 structure for
4202 * loopback_dev first by hand.
4203 * Longer term, all of the dependencies ipv6 has upon the loopback
4204 * device and it being up should be removed.
4205 */
4206 rtnl_lock();
4207 if (!ipv6_add_dev(&loopback_dev))
4208 err = -ENOMEM;
4209 rtnl_unlock();
4210 if (err)
4211 return err;
4212
4213 ip6_null_entry.rt6i_idev = in6_dev_get(&loopback_dev);
4214 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
4215 ip6_prohibit_entry.rt6i_idev = in6_dev_get(&loopback_dev);
4216 ip6_blk_hole_entry.rt6i_idev = in6_dev_get(&loopback_dev);
4217 #endif
4218
4219 register_netdevice_notifier(&ipv6_dev_notf);
4220
4221 addrconf_verify(0);
4222
4223 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4224 if (err < 0)
4225 goto errout;
4226
4227 /* Only the first call to __rtnl_register can fail */
4228 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4229 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4230 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4231 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4232 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4233
4234 #ifdef CONFIG_SYSCTL
4235 addrconf_sysctl.sysctl_header =
4236 register_sysctl_table(addrconf_sysctl.addrconf_root_dir);
4237 addrconf_sysctl_register(NULL, &ipv6_devconf_dflt);
4238 #endif
4239
4240 return 0;
4241 errout:
4242 unregister_netdevice_notifier(&ipv6_dev_notf);
4243
4244 return err;
4245 }
4246
4247 void __exit addrconf_cleanup(void)
4248 {
4249 struct net_device *dev;
4250 struct inet6_ifaddr *ifa;
4251 int i;
4252
4253 unregister_netdevice_notifier(&ipv6_dev_notf);
4254
4255 #ifdef CONFIG_SYSCTL
4256 addrconf_sysctl_unregister(&ipv6_devconf_dflt);
4257 addrconf_sysctl_unregister(&ipv6_devconf);
4258 #endif
4259
4260 rtnl_lock();
4261
4262 /*
4263 * clean dev list.
4264 */
4265
4266 for_each_netdev(dev) {
4267 if (__in6_dev_get(dev) == NULL)
4268 continue;
4269 addrconf_ifdown(dev, 1);
4270 }
4271 addrconf_ifdown(&loopback_dev, 2);
4272
4273 /*
4274 * Check hash table.
4275 */
4276
4277 write_lock_bh(&addrconf_hash_lock);
4278 for (i=0; i < IN6_ADDR_HSIZE; i++) {
4279 for (ifa=inet6_addr_lst[i]; ifa; ) {
4280 struct inet6_ifaddr *bifa;
4281
4282 bifa = ifa;
4283 ifa = ifa->lst_next;
4284 printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
4285 /* Do not free it; something is wrong.
4286 Now we can investigate it with debugger.
4287 */
4288 }
4289 }
4290 write_unlock_bh(&addrconf_hash_lock);
4291
4292 del_timer(&addr_chk_timer);
4293
4294 rtnl_unlock();
4295
4296 #ifdef CONFIG_PROC_FS
4297 proc_net_remove(&init_net, "if_inet6");
4298 #endif
4299 }
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