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[NET]: fix up misplaced inlines.
[linux-2.6.22.y-op.git] / net / ipv6 / addrconf.c
blob1b616992d91637de002f87ab94843ce90301ba33
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/sock.h>
66 #include <net/snmp.h>
67
68 #include <net/ipv6.h>
69 #include <net/protocol.h>
70 #include <net/ndisc.h>
71 #include <net/ip6_route.h>
72 #include <net/addrconf.h>
73 #include <net/tcp.h>
74 #include <net/ip.h>
75 #include <net/netlink.h>
76 #include <linux/if_tunnel.h>
77 #include <linux/rtnetlink.h>
78
79 #ifdef CONFIG_IPV6_PRIVACY
80 #include <linux/random.h>
81 #endif
82
83 #include <asm/uaccess.h>
84
85 #include <linux/proc_fs.h>
86 #include <linux/seq_file.h>
87
88 /* Set to 3 to get tracing... */
89 #define ACONF_DEBUG 2
90
91 #if ACONF_DEBUG >= 3
92 #define ADBG(x) printk x
93 #else
94 #define ADBG(x)
95 #endif
96
97 #define INFINITY_LIFE_TIME 0xFFFFFFFF
98 #define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b)))
99
100 #ifdef CONFIG_SYSCTL
101 static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p);
102 static void addrconf_sysctl_unregister(struct ipv6_devconf *p);
103 #endif
104
105 #ifdef CONFIG_IPV6_PRIVACY
106 static int __ipv6_regen_rndid(struct inet6_dev *idev);
107 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
108 static void ipv6_regen_rndid(unsigned long data);
109
110 static int desync_factor = MAX_DESYNC_FACTOR * HZ;
111 #endif
112
113 static int ipv6_count_addresses(struct inet6_dev *idev);
114
115 /*
116 * Configured unicast address hash table
117 */
118 static struct inet6_ifaddr *inet6_addr_lst[IN6_ADDR_HSIZE];
119 static DEFINE_RWLOCK(addrconf_hash_lock);
120
121 static void addrconf_verify(unsigned long);
122
123 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
124 static DEFINE_SPINLOCK(addrconf_verify_lock);
125
126 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
127 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
128
129 static int addrconf_ifdown(struct net_device *dev, int how);
130
131 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
132 static void addrconf_dad_timer(unsigned long data);
133 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
134 static void addrconf_dad_run(struct inet6_dev *idev);
135 static void addrconf_rs_timer(unsigned long data);
136 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
137 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
138
139 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
140 struct prefix_info *pinfo);
141 static int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev);
142
143 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
144
145 struct ipv6_devconf ipv6_devconf __read_mostly = {
146 .forwarding = 0,
147 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
148 .mtu6 = IPV6_MIN_MTU,
149 .accept_ra = 1,
150 .accept_redirects = 1,
151 .autoconf = 1,
152 .force_mld_version = 0,
153 .dad_transmits = 1,
154 .rtr_solicits = MAX_RTR_SOLICITATIONS,
155 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
156 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
157 #ifdef CONFIG_IPV6_PRIVACY
158 .use_tempaddr = 0,
159 .temp_valid_lft = TEMP_VALID_LIFETIME,
160 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
161 .regen_max_retry = REGEN_MAX_RETRY,
162 .max_desync_factor = MAX_DESYNC_FACTOR,
163 #endif
164 .max_addresses = IPV6_MAX_ADDRESSES,
165 .accept_ra_defrtr = 1,
166 .accept_ra_pinfo = 1,
167 #ifdef CONFIG_IPV6_ROUTER_PREF
168 .accept_ra_rtr_pref = 1,
169 .rtr_probe_interval = 60 * HZ,
170 #ifdef CONFIG_IPV6_ROUTE_INFO
171 .accept_ra_rt_info_max_plen = 0,
172 #endif
173 #endif
174 .proxy_ndp = 0,
175 };
176
177 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
178 .forwarding = 0,
179 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
180 .mtu6 = IPV6_MIN_MTU,
181 .accept_ra = 1,
182 .accept_redirects = 1,
183 .autoconf = 1,
184 .dad_transmits = 1,
185 .rtr_solicits = MAX_RTR_SOLICITATIONS,
186 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
187 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
188 #ifdef CONFIG_IPV6_PRIVACY
189 .use_tempaddr = 0,
190 .temp_valid_lft = TEMP_VALID_LIFETIME,
191 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
192 .regen_max_retry = REGEN_MAX_RETRY,
193 .max_desync_factor = MAX_DESYNC_FACTOR,
194 #endif
195 .max_addresses = IPV6_MAX_ADDRESSES,
196 .accept_ra_defrtr = 1,
197 .accept_ra_pinfo = 1,
198 #ifdef CONFIG_IPV6_ROUTER_PREF
199 .accept_ra_rtr_pref = 1,
200 .rtr_probe_interval = 60 * HZ,
201 #ifdef CONFIG_IPV6_ROUTE_INFO
202 .accept_ra_rt_info_max_plen = 0,
203 #endif
204 #endif
205 .proxy_ndp = 0,
206 };
207
208 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
209 #if 0
210 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
211 #endif
212 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
213
214 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
215 {
216 if (del_timer(&ifp->timer))
217 __in6_ifa_put(ifp);
218 }
219
220 enum addrconf_timer_t
221 {
222 AC_NONE,
223 AC_DAD,
224 AC_RS,
225 };
226
227 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
228 enum addrconf_timer_t what,
229 unsigned long when)
230 {
231 if (!del_timer(&ifp->timer))
232 in6_ifa_hold(ifp);
233
234 switch (what) {
235 case AC_DAD:
236 ifp->timer.function = addrconf_dad_timer;
237 break;
238 case AC_RS:
239 ifp->timer.function = addrconf_rs_timer;
240 break;
241 default:;
242 }
243 ifp->timer.expires = jiffies + when;
244 add_timer(&ifp->timer);
245 }
246
247 /* Nobody refers to this device, we may destroy it. */
248
249 static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
250 {
251 struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
252 kfree(idev);
253 }
254
255 void in6_dev_finish_destroy(struct inet6_dev *idev)
256 {
257 struct net_device *dev = idev->dev;
258 BUG_TRAP(idev->addr_list==NULL);
259 BUG_TRAP(idev->mc_list==NULL);
260 #ifdef NET_REFCNT_DEBUG
261 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
262 #endif
263 dev_put(dev);
264 if (!idev->dead) {
265 printk("Freeing alive inet6 device %p\n", idev);
266 return;
267 }
268 snmp6_free_dev(idev);
269 call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
270 }
271
272 static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
273 {
274 struct inet6_dev *ndev;
275 struct in6_addr maddr;
276
277 ASSERT_RTNL();
278
279 if (dev->mtu < IPV6_MIN_MTU)
280 return NULL;
281
282 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
283
284 if (ndev == NULL)
285 return NULL;
286
287 rwlock_init(&ndev->lock);
288 ndev->dev = dev;
289 memcpy(&ndev->cnf, &ipv6_devconf_dflt, sizeof(ndev->cnf));
290 ndev->cnf.mtu6 = dev->mtu;
291 ndev->cnf.sysctl = NULL;
292 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
293 if (ndev->nd_parms == NULL) {
294 kfree(ndev);
295 return NULL;
296 }
297 /* We refer to the device */
298 dev_hold(dev);
299
300 if (snmp6_alloc_dev(ndev) < 0) {
301 ADBG((KERN_WARNING
302 "%s(): cannot allocate memory for statistics; dev=%s.\n",
303 __FUNCTION__, dev->name));
304 neigh_parms_release(&nd_tbl, ndev->nd_parms);
305 ndev->dead = 1;
306 in6_dev_finish_destroy(ndev);
307 return NULL;
308 }
309
310 if (snmp6_register_dev(ndev) < 0) {
311 ADBG((KERN_WARNING
312 "%s(): cannot create /proc/net/dev_snmp6/%s\n",
313 __FUNCTION__, dev->name));
314 neigh_parms_release(&nd_tbl, ndev->nd_parms);
315 ndev->dead = 1;
316 in6_dev_finish_destroy(ndev);
317 return NULL;
318 }
319
320 /* One reference from device. We must do this before
321 * we invoke __ipv6_regen_rndid().
322 */
323 in6_dev_hold(ndev);
324
325 #ifdef CONFIG_IPV6_PRIVACY
326 init_timer(&ndev->regen_timer);
327 ndev->regen_timer.function = ipv6_regen_rndid;
328 ndev->regen_timer.data = (unsigned long) ndev;
329 if ((dev->flags&IFF_LOOPBACK) ||
330 dev->type == ARPHRD_TUNNEL ||
331 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
332 dev->type == ARPHRD_SIT ||
333 #endif
334 dev->type == ARPHRD_NONE) {
335 printk(KERN_INFO
336 "%s: Disabled Privacy Extensions\n",
337 dev->name);
338 ndev->cnf.use_tempaddr = -1;
339 } else {
340 in6_dev_hold(ndev);
341 ipv6_regen_rndid((unsigned long) ndev);
342 }
343 #endif
344
345 ipv6_mc_init_dev(ndev);
346 ndev->tstamp = jiffies;
347 #ifdef CONFIG_SYSCTL
348 neigh_sysctl_register(dev, ndev->nd_parms, NET_IPV6,
349 NET_IPV6_NEIGH, "ipv6",
350 &ndisc_ifinfo_sysctl_change,
351 NULL);
352 addrconf_sysctl_register(ndev, &ndev->cnf);
353 #endif
354 /* protected by rtnl_lock */
355 rcu_assign_pointer(dev->ip6_ptr, ndev);
356
357 /* Join all-node multicast group */
358 ipv6_addr_all_nodes(&maddr);
359 ipv6_dev_mc_inc(dev, &maddr);
360
361 return ndev;
362 }
363
364 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
365 {
366 struct inet6_dev *idev;
367
368 ASSERT_RTNL();
369
370 if ((idev = __in6_dev_get(dev)) == NULL) {
371 if ((idev = ipv6_add_dev(dev)) == NULL)
372 return NULL;
373 }
374
375 if (dev->flags&IFF_UP)
376 ipv6_mc_up(idev);
377 return idev;
378 }
379
380 #ifdef CONFIG_SYSCTL
381 static void dev_forward_change(struct inet6_dev *idev)
382 {
383 struct net_device *dev;
384 struct inet6_ifaddr *ifa;
385 struct in6_addr addr;
386
387 if (!idev)
388 return;
389 dev = idev->dev;
390 if (dev && (dev->flags & IFF_MULTICAST)) {
391 ipv6_addr_all_routers(&addr);
392
393 if (idev->cnf.forwarding)
394 ipv6_dev_mc_inc(dev, &addr);
395 else
396 ipv6_dev_mc_dec(dev, &addr);
397 }
398 for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
399 if (ifa->flags&IFA_F_TENTATIVE)
400 continue;
401 if (idev->cnf.forwarding)
402 addrconf_join_anycast(ifa);
403 else
404 addrconf_leave_anycast(ifa);
405 }
406 }
407
408
409 static void addrconf_forward_change(void)
410 {
411 struct net_device *dev;
412 struct inet6_dev *idev;
413
414 read_lock(&dev_base_lock);
415 for (dev=dev_base; dev; dev=dev->next) {
416 rcu_read_lock();
417 idev = __in6_dev_get(dev);
418 if (idev) {
419 int changed = (!idev->cnf.forwarding) ^ (!ipv6_devconf.forwarding);
420 idev->cnf.forwarding = ipv6_devconf.forwarding;
421 if (changed)
422 dev_forward_change(idev);
423 }
424 rcu_read_unlock();
425 }
426 read_unlock(&dev_base_lock);
427 }
428 #endif
429
430 /* Nobody refers to this ifaddr, destroy it */
431
432 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
433 {
434 BUG_TRAP(ifp->if_next==NULL);
435 BUG_TRAP(ifp->lst_next==NULL);
436 #ifdef NET_REFCNT_DEBUG
437 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
438 #endif
439
440 in6_dev_put(ifp->idev);
441
442 if (del_timer(&ifp->timer))
443 printk("Timer is still running, when freeing ifa=%p\n", ifp);
444
445 if (!ifp->dead) {
446 printk("Freeing alive inet6 address %p\n", ifp);
447 return;
448 }
449 dst_release(&ifp->rt->u.dst);
450
451 kfree(ifp);
452 }
453
454 static void
455 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
456 {
457 struct inet6_ifaddr *ifa, **ifap;
458 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
459
460 /*
461 * Each device address list is sorted in order of scope -
462 * global before linklocal.
463 */
464 for (ifap = &idev->addr_list; (ifa = *ifap) != NULL;
465 ifap = &ifa->if_next) {
466 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
467 break;
468 }
469
470 ifp->if_next = *ifap;
471 *ifap = ifp;
472 }
473
474 /* On success it returns ifp with increased reference count */
475
476 static struct inet6_ifaddr *
477 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
478 int scope, u32 flags)
479 {
480 struct inet6_ifaddr *ifa = NULL;
481 struct rt6_info *rt;
482 int hash;
483 int err = 0;
484
485 rcu_read_lock_bh();
486 if (idev->dead) {
487 err = -ENODEV; /*XXX*/
488 goto out2;
489 }
490
491 write_lock(&addrconf_hash_lock);
492
493 /* Ignore adding duplicate addresses on an interface */
494 if (ipv6_chk_same_addr(addr, idev->dev)) {
495 ADBG(("ipv6_add_addr: already assigned\n"));
496 err = -EEXIST;
497 goto out;
498 }
499
500 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
501
502 if (ifa == NULL) {
503 ADBG(("ipv6_add_addr: malloc failed\n"));
504 err = -ENOBUFS;
505 goto out;
506 }
507
508 rt = addrconf_dst_alloc(idev, addr, 0);
509 if (IS_ERR(rt)) {
510 err = PTR_ERR(rt);
511 goto out;
512 }
513
514 ipv6_addr_copy(&ifa->addr, addr);
515
516 spin_lock_init(&ifa->lock);
517 init_timer(&ifa->timer);
518 ifa->timer.data = (unsigned long) ifa;
519 ifa->scope = scope;
520 ifa->prefix_len = pfxlen;
521 ifa->flags = flags | IFA_F_TENTATIVE;
522 ifa->cstamp = ifa->tstamp = jiffies;
523
524 ifa->rt = rt;
525
526 ifa->idev = idev;
527 in6_dev_hold(idev);
528 /* For caller */
529 in6_ifa_hold(ifa);
530
531 /* Add to big hash table */
532 hash = ipv6_addr_hash(addr);
533
534 ifa->lst_next = inet6_addr_lst[hash];
535 inet6_addr_lst[hash] = ifa;
536 in6_ifa_hold(ifa);
537 write_unlock(&addrconf_hash_lock);
538
539 write_lock(&idev->lock);
540 /* Add to inet6_dev unicast addr list. */
541 ipv6_link_dev_addr(idev, ifa);
542
543 #ifdef CONFIG_IPV6_PRIVACY
544 if (ifa->flags&IFA_F_TEMPORARY) {
545 ifa->tmp_next = idev->tempaddr_list;
546 idev->tempaddr_list = ifa;
547 in6_ifa_hold(ifa);
548 }
549 #endif
550
551 in6_ifa_hold(ifa);
552 write_unlock(&idev->lock);
553 out2:
554 rcu_read_unlock_bh();
555
556 if (likely(err == 0))
557 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
558 else {
559 kfree(ifa);
560 ifa = ERR_PTR(err);
561 }
562
563 return ifa;
564 out:
565 write_unlock(&addrconf_hash_lock);
566 goto out2;
567 }
568
569 /* This function wants to get referenced ifp and releases it before return */
570
571 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
572 {
573 struct inet6_ifaddr *ifa, **ifap;
574 struct inet6_dev *idev = ifp->idev;
575 int hash;
576 int deleted = 0, onlink = 0;
577 unsigned long expires = jiffies;
578
579 hash = ipv6_addr_hash(&ifp->addr);
580
581 ifp->dead = 1;
582
583 write_lock_bh(&addrconf_hash_lock);
584 for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
585 ifap = &ifa->lst_next) {
586 if (ifa == ifp) {
587 *ifap = ifa->lst_next;
588 __in6_ifa_put(ifp);
589 ifa->lst_next = NULL;
590 break;
591 }
592 }
593 write_unlock_bh(&addrconf_hash_lock);
594
595 write_lock_bh(&idev->lock);
596 #ifdef CONFIG_IPV6_PRIVACY
597 if (ifp->flags&IFA_F_TEMPORARY) {
598 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
599 ifap = &ifa->tmp_next) {
600 if (ifa == ifp) {
601 *ifap = ifa->tmp_next;
602 if (ifp->ifpub) {
603 in6_ifa_put(ifp->ifpub);
604 ifp->ifpub = NULL;
605 }
606 __in6_ifa_put(ifp);
607 ifa->tmp_next = NULL;
608 break;
609 }
610 }
611 }
612 #endif
613
614 for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
615 if (ifa == ifp) {
616 *ifap = ifa->if_next;
617 __in6_ifa_put(ifp);
618 ifa->if_next = NULL;
619 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
620 break;
621 deleted = 1;
622 continue;
623 } else if (ifp->flags & IFA_F_PERMANENT) {
624 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
625 ifp->prefix_len)) {
626 if (ifa->flags & IFA_F_PERMANENT) {
627 onlink = 1;
628 if (deleted)
629 break;
630 } else {
631 unsigned long lifetime;
632
633 if (!onlink)
634 onlink = -1;
635
636 spin_lock(&ifa->lock);
637 lifetime = min_t(unsigned long,
638 ifa->valid_lft, 0x7fffffffUL/HZ);
639 if (time_before(expires,
640 ifa->tstamp + lifetime * HZ))
641 expires = ifa->tstamp + lifetime * HZ;
642 spin_unlock(&ifa->lock);
643 }
644 }
645 }
646 ifap = &ifa->if_next;
647 }
648 write_unlock_bh(&idev->lock);
649
650 ipv6_ifa_notify(RTM_DELADDR, ifp);
651
652 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
653
654 addrconf_del_timer(ifp);
655
656 /*
657 * Purge or update corresponding prefix
658 *
659 * 1) we don't purge prefix here if address was not permanent.
660 * prefix is managed by its own lifetime.
661 * 2) if there're no addresses, delete prefix.
662 * 3) if there're still other permanent address(es),
663 * corresponding prefix is still permanent.
664 * 4) otherwise, update prefix lifetime to the
665 * longest valid lifetime among the corresponding
666 * addresses on the device.
667 * Note: subsequent RA will update lifetime.
668 *
669 * --yoshfuji
670 */
671 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
672 struct in6_addr prefix;
673 struct rt6_info *rt;
674
675 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
676 rt = rt6_lookup(&prefix, NULL, ifp->idev->dev->ifindex, 1);
677
678 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
679 if (onlink == 0) {
680 ip6_del_rt(rt);
681 rt = NULL;
682 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
683 rt->rt6i_expires = expires;
684 rt->rt6i_flags |= RTF_EXPIRES;
685 }
686 }
687 dst_release(&rt->u.dst);
688 }
689
690 in6_ifa_put(ifp);
691 }
692
693 #ifdef CONFIG_IPV6_PRIVACY
694 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
695 {
696 struct inet6_dev *idev = ifp->idev;
697 struct in6_addr addr, *tmpaddr;
698 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
699 int tmp_plen;
700 int ret = 0;
701 int max_addresses;
702
703 write_lock(&idev->lock);
704 if (ift) {
705 spin_lock_bh(&ift->lock);
706 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
707 spin_unlock_bh(&ift->lock);
708 tmpaddr = &addr;
709 } else {
710 tmpaddr = NULL;
711 }
712 retry:
713 in6_dev_hold(idev);
714 if (idev->cnf.use_tempaddr <= 0) {
715 write_unlock(&idev->lock);
716 printk(KERN_INFO
717 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
718 in6_dev_put(idev);
719 ret = -1;
720 goto out;
721 }
722 spin_lock_bh(&ifp->lock);
723 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
724 idev->cnf.use_tempaddr = -1; /*XXX*/
725 spin_unlock_bh(&ifp->lock);
726 write_unlock(&idev->lock);
727 printk(KERN_WARNING
728 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
729 in6_dev_put(idev);
730 ret = -1;
731 goto out;
732 }
733 in6_ifa_hold(ifp);
734 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
735 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
736 spin_unlock_bh(&ifp->lock);
737 write_unlock(&idev->lock);
738 printk(KERN_WARNING
739 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
740 in6_ifa_put(ifp);
741 in6_dev_put(idev);
742 ret = -1;
743 goto out;
744 }
745 memcpy(&addr.s6_addr[8], idev->rndid, 8);
746 tmp_valid_lft = min_t(__u32,
747 ifp->valid_lft,
748 idev->cnf.temp_valid_lft);
749 tmp_prefered_lft = min_t(__u32,
750 ifp->prefered_lft,
751 idev->cnf.temp_prefered_lft - desync_factor / HZ);
752 tmp_plen = ifp->prefix_len;
753 max_addresses = idev->cnf.max_addresses;
754 tmp_cstamp = ifp->cstamp;
755 tmp_tstamp = ifp->tstamp;
756 spin_unlock_bh(&ifp->lock);
757
758 write_unlock(&idev->lock);
759 ift = !max_addresses ||
760 ipv6_count_addresses(idev) < max_addresses ?
761 ipv6_add_addr(idev, &addr, tmp_plen,
762 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK, IFA_F_TEMPORARY) : NULL;
763 if (!ift || IS_ERR(ift)) {
764 in6_ifa_put(ifp);
765 in6_dev_put(idev);
766 printk(KERN_INFO
767 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
768 tmpaddr = &addr;
769 write_lock(&idev->lock);
770 goto retry;
771 }
772
773 spin_lock_bh(&ift->lock);
774 ift->ifpub = ifp;
775 ift->valid_lft = tmp_valid_lft;
776 ift->prefered_lft = tmp_prefered_lft;
777 ift->cstamp = tmp_cstamp;
778 ift->tstamp = tmp_tstamp;
779 spin_unlock_bh(&ift->lock);
780
781 addrconf_dad_start(ift, 0);
782 in6_ifa_put(ift);
783 in6_dev_put(idev);
784 out:
785 return ret;
786 }
787 #endif
788
789 /*
790 * Choose an appropriate source address (RFC3484)
791 */
792 struct ipv6_saddr_score {
793 int addr_type;
794 unsigned int attrs;
795 int matchlen;
796 int scope;
797 unsigned int rule;
798 };
799
800 #define IPV6_SADDR_SCORE_LOCAL 0x0001
801 #define IPV6_SADDR_SCORE_PREFERRED 0x0004
802 #define IPV6_SADDR_SCORE_HOA 0x0008
803 #define IPV6_SADDR_SCORE_OIF 0x0010
804 #define IPV6_SADDR_SCORE_LABEL 0x0020
805 #define IPV6_SADDR_SCORE_PRIVACY 0x0040
806
807 static inline int ipv6_saddr_preferred(int type)
808 {
809 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
810 IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
811 return 1;
812 return 0;
813 }
814
815 /* static matching label */
816 static inline int ipv6_saddr_label(const struct in6_addr *addr, int type)
817 {
818 /*
819 * prefix (longest match) label
820 * -----------------------------
821 * ::1/128 0
822 * ::/0 1
823 * 2002::/16 2
824 * ::/96 3
825 * ::ffff:0:0/96 4
826 * fc00::/7 5
827 * 2001::/32 6
828 */
829 if (type & IPV6_ADDR_LOOPBACK)
830 return 0;
831 else if (type & IPV6_ADDR_COMPATv4)
832 return 3;
833 else if (type & IPV6_ADDR_MAPPED)
834 return 4;
835 else if (addr->s6_addr32[0] == htonl(0x20010000))
836 return 6;
837 else if (addr->s6_addr16[0] == htons(0x2002))
838 return 2;
839 else if ((addr->s6_addr[0] & 0xfe) == 0xfc)
840 return 5;
841 return 1;
842 }
843
844 int ipv6_dev_get_saddr(struct net_device *daddr_dev,
845 struct in6_addr *daddr, struct in6_addr *saddr)
846 {
847 struct ipv6_saddr_score hiscore;
848 struct inet6_ifaddr *ifa_result = NULL;
849 int daddr_type = __ipv6_addr_type(daddr);
850 int daddr_scope = __ipv6_addr_src_scope(daddr_type);
851 u32 daddr_label = ipv6_saddr_label(daddr, daddr_type);
852 struct net_device *dev;
853
854 memset(&hiscore, 0, sizeof(hiscore));
855
856 read_lock(&dev_base_lock);
857 rcu_read_lock();
858
859 for (dev = dev_base; dev; dev=dev->next) {
860 struct inet6_dev *idev;
861 struct inet6_ifaddr *ifa;
862
863 /* Rule 0: Candidate Source Address (section 4)
864 * - multicast and link-local destination address,
865 * the set of candidate source address MUST only
866 * include addresses assigned to interfaces
867 * belonging to the same link as the outgoing
868 * interface.
869 * (- For site-local destination addresses, the
870 * set of candidate source addresses MUST only
871 * include addresses assigned to interfaces
872 * belonging to the same site as the outgoing
873 * interface.)
874 */
875 if ((daddr_type & IPV6_ADDR_MULTICAST ||
876 daddr_scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
877 daddr_dev && dev != daddr_dev)
878 continue;
879
880 idev = __in6_dev_get(dev);
881 if (!idev)
882 continue;
883
884 read_lock_bh(&idev->lock);
885 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
886 struct ipv6_saddr_score score;
887
888 score.addr_type = __ipv6_addr_type(&ifa->addr);
889
890 /* Rule 0:
891 * - Tentative Address (RFC2462 section 5.4)
892 * - A tentative address is not considered
893 * "assigned to an interface" in the traditional
894 * sense.
895 * - Candidate Source Address (section 4)
896 * - In any case, anycast addresses, multicast
897 * addresses, and the unspecified address MUST
898 * NOT be included in a candidate set.
899 */
900 if (ifa->flags & IFA_F_TENTATIVE)
901 continue;
902 if (unlikely(score.addr_type == IPV6_ADDR_ANY ||
903 score.addr_type & IPV6_ADDR_MULTICAST)) {
904 LIMIT_NETDEBUG(KERN_DEBUG
905 "ADDRCONF: unspecified / multicast address"
906 "assigned as unicast address on %s",
907 dev->name);
908 continue;
909 }
910
911 score.attrs = 0;
912 score.matchlen = 0;
913 score.scope = 0;
914 score.rule = 0;
915
916 if (ifa_result == NULL) {
917 /* record it if the first available entry */
918 goto record_it;
919 }
920
921 /* Rule 1: Prefer same address */
922 if (hiscore.rule < 1) {
923 if (ipv6_addr_equal(&ifa_result->addr, daddr))
924 hiscore.attrs |= IPV6_SADDR_SCORE_LOCAL;
925 hiscore.rule++;
926 }
927 if (ipv6_addr_equal(&ifa->addr, daddr)) {
928 score.attrs |= IPV6_SADDR_SCORE_LOCAL;
929 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)) {
930 score.rule = 1;
931 goto record_it;
932 }
933 } else {
934 if (hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)
935 continue;
936 }
937
938 /* Rule 2: Prefer appropriate scope */
939 if (hiscore.rule < 2) {
940 hiscore.scope = __ipv6_addr_src_scope(hiscore.addr_type);
941 hiscore.rule++;
942 }
943 score.scope = __ipv6_addr_src_scope(score.addr_type);
944 if (hiscore.scope < score.scope) {
945 if (hiscore.scope < daddr_scope) {
946 score.rule = 2;
947 goto record_it;
948 } else
949 continue;
950 } else if (score.scope < hiscore.scope) {
951 if (score.scope < daddr_scope)
952 break; /* addresses sorted by scope */
953 else {
954 score.rule = 2;
955 goto record_it;
956 }
957 }
958
959 /* Rule 3: Avoid deprecated address */
960 if (hiscore.rule < 3) {
961 if (ipv6_saddr_preferred(hiscore.addr_type) ||
962 !(ifa_result->flags & IFA_F_DEPRECATED))
963 hiscore.attrs |= IPV6_SADDR_SCORE_PREFERRED;
964 hiscore.rule++;
965 }
966 if (ipv6_saddr_preferred(score.addr_type) ||
967 !(ifa->flags & IFA_F_DEPRECATED)) {
968 score.attrs |= IPV6_SADDR_SCORE_PREFERRED;
969 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)) {
970 score.rule = 3;
971 goto record_it;
972 }
973 } else {
974 if (hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)
975 continue;
976 }
977
978 /* Rule 4: Prefer home address */
979 #ifdef CONFIG_IPV6_MIP6
980 if (hiscore.rule < 4) {
981 if (ifa_result->flags & IFA_F_HOMEADDRESS)
982 hiscore.attrs |= IPV6_SADDR_SCORE_HOA;
983 hiscore.rule++;
984 }
985 if (ifa->flags & IFA_F_HOMEADDRESS) {
986 score.attrs |= IPV6_SADDR_SCORE_HOA;
987 if (!(ifa_result->flags & IFA_F_HOMEADDRESS)) {
988 score.rule = 4;
989 goto record_it;
990 }
991 } else {
992 if (hiscore.attrs & IPV6_SADDR_SCORE_HOA)
993 continue;
994 }
995 #else
996 if (hiscore.rule < 4)
997 hiscore.rule++;
998 #endif
999
1000 /* Rule 5: Prefer outgoing interface */
1001 if (hiscore.rule < 5) {
1002 if (daddr_dev == NULL ||
1003 daddr_dev == ifa_result->idev->dev)
1004 hiscore.attrs |= IPV6_SADDR_SCORE_OIF;
1005 hiscore.rule++;
1006 }
1007 if (daddr_dev == NULL ||
1008 daddr_dev == ifa->idev->dev) {
1009 score.attrs |= IPV6_SADDR_SCORE_OIF;
1010 if (!(hiscore.attrs & IPV6_SADDR_SCORE_OIF)) {
1011 score.rule = 5;
1012 goto record_it;
1013 }
1014 } else {
1015 if (hiscore.attrs & IPV6_SADDR_SCORE_OIF)
1016 continue;
1017 }
1018
1019 /* Rule 6: Prefer matching label */
1020 if (hiscore.rule < 6) {
1021 if (ipv6_saddr_label(&ifa_result->addr, hiscore.addr_type) == daddr_label)
1022 hiscore.attrs |= IPV6_SADDR_SCORE_LABEL;
1023 hiscore.rule++;
1024 }
1025 if (ipv6_saddr_label(&ifa->addr, score.addr_type) == daddr_label) {
1026 score.attrs |= IPV6_SADDR_SCORE_LABEL;
1027 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LABEL)) {
1028 score.rule = 6;
1029 goto record_it;
1030 }
1031 } else {
1032 if (hiscore.attrs & IPV6_SADDR_SCORE_LABEL)
1033 continue;
1034 }
1035
1036 #ifdef CONFIG_IPV6_PRIVACY
1037 /* Rule 7: Prefer public address
1038 * Note: prefer temprary address if use_tempaddr >= 2
1039 */
1040 if (hiscore.rule < 7) {
1041 if ((!(ifa_result->flags & IFA_F_TEMPORARY)) ^
1042 (ifa_result->idev->cnf.use_tempaddr >= 2))
1043 hiscore.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1044 hiscore.rule++;
1045 }
1046 if ((!(ifa->flags & IFA_F_TEMPORARY)) ^
1047 (ifa->idev->cnf.use_tempaddr >= 2)) {
1048 score.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1049 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)) {
1050 score.rule = 7;
1051 goto record_it;
1052 }
1053 } else {
1054 if (hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)
1055 continue;
1056 }
1057 #else
1058 if (hiscore.rule < 7)
1059 hiscore.rule++;
1060 #endif
1061 /* Rule 8: Use longest matching prefix */
1062 if (hiscore.rule < 8) {
1063 hiscore.matchlen = ipv6_addr_diff(&ifa_result->addr, daddr);
1064 hiscore.rule++;
1065 }
1066 score.matchlen = ipv6_addr_diff(&ifa->addr, daddr);
1067 if (score.matchlen > hiscore.matchlen) {
1068 score.rule = 8;
1069 goto record_it;
1070 }
1071 #if 0
1072 else if (score.matchlen < hiscore.matchlen)
1073 continue;
1074 #endif
1075
1076 /* Final Rule: choose first available one */
1077 continue;
1078 record_it:
1079 if (ifa_result)
1080 in6_ifa_put(ifa_result);
1081 in6_ifa_hold(ifa);
1082 ifa_result = ifa;
1083 hiscore = score;
1084 }
1085 read_unlock_bh(&idev->lock);
1086 }
1087 rcu_read_unlock();
1088 read_unlock(&dev_base_lock);
1089
1090 if (!ifa_result)
1091 return -EADDRNOTAVAIL;
1092
1093 ipv6_addr_copy(saddr, &ifa_result->addr);
1094 in6_ifa_put(ifa_result);
1095 return 0;
1096 }
1097
1098
1099 int ipv6_get_saddr(struct dst_entry *dst,
1100 struct in6_addr *daddr, struct in6_addr *saddr)
1101 {
1102 return ipv6_dev_get_saddr(dst ? ip6_dst_idev(dst)->dev : NULL, daddr, saddr);
1103 }
1104
1105
1106 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr)
1107 {
1108 struct inet6_dev *idev;
1109 int err = -EADDRNOTAVAIL;
1110
1111 rcu_read_lock();
1112 if ((idev = __in6_dev_get(dev)) != NULL) {
1113 struct inet6_ifaddr *ifp;
1114
1115 read_lock_bh(&idev->lock);
1116 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1117 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1118 ipv6_addr_copy(addr, &ifp->addr);
1119 err = 0;
1120 break;
1121 }
1122 }
1123 read_unlock_bh(&idev->lock);
1124 }
1125 rcu_read_unlock();
1126 return err;
1127 }
1128
1129 static int ipv6_count_addresses(struct inet6_dev *idev)
1130 {
1131 int cnt = 0;
1132 struct inet6_ifaddr *ifp;
1133
1134 read_lock_bh(&idev->lock);
1135 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1136 cnt++;
1137 read_unlock_bh(&idev->lock);
1138 return cnt;
1139 }
1140
1141 int ipv6_chk_addr(struct in6_addr *addr, struct net_device *dev, int strict)
1142 {
1143 struct inet6_ifaddr * ifp;
1144 u8 hash = ipv6_addr_hash(addr);
1145
1146 read_lock_bh(&addrconf_hash_lock);
1147 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1148 if (ipv6_addr_equal(&ifp->addr, addr) &&
1149 !(ifp->flags&IFA_F_TENTATIVE)) {
1150 if (dev == NULL || ifp->idev->dev == dev ||
1151 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1152 break;
1153 }
1154 }
1155 read_unlock_bh(&addrconf_hash_lock);
1156 return ifp != NULL;
1157 }
1158
1159 static
1160 int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev)
1161 {
1162 struct inet6_ifaddr * ifp;
1163 u8 hash = ipv6_addr_hash(addr);
1164
1165 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1166 if (ipv6_addr_equal(&ifp->addr, addr)) {
1167 if (dev == NULL || ifp->idev->dev == dev)
1168 break;
1169 }
1170 }
1171 return ifp != NULL;
1172 }
1173
1174 struct inet6_ifaddr * ipv6_get_ifaddr(struct in6_addr *addr, struct net_device *dev, int strict)
1175 {
1176 struct inet6_ifaddr * ifp;
1177 u8 hash = ipv6_addr_hash(addr);
1178
1179 read_lock_bh(&addrconf_hash_lock);
1180 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1181 if (ipv6_addr_equal(&ifp->addr, addr)) {
1182 if (dev == NULL || ifp->idev->dev == dev ||
1183 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1184 in6_ifa_hold(ifp);
1185 break;
1186 }
1187 }
1188 }
1189 read_unlock_bh(&addrconf_hash_lock);
1190
1191 return ifp;
1192 }
1193
1194 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1195 {
1196 const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
1197 const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
1198 __be32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
1199 __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1200 int sk_ipv6only = ipv6_only_sock(sk);
1201 int sk2_ipv6only = inet_v6_ipv6only(sk2);
1202 int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1203 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1204
1205 if (!sk2_rcv_saddr && !sk_ipv6only)
1206 return 1;
1207
1208 if (addr_type2 == IPV6_ADDR_ANY &&
1209 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1210 return 1;
1211
1212 if (addr_type == IPV6_ADDR_ANY &&
1213 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1214 return 1;
1215
1216 if (sk2_rcv_saddr6 &&
1217 ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1218 return 1;
1219
1220 if (addr_type == IPV6_ADDR_MAPPED &&
1221 !sk2_ipv6only &&
1222 (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1223 return 1;
1224
1225 return 0;
1226 }
1227
1228 /* Gets referenced address, destroys ifaddr */
1229
1230 static void addrconf_dad_stop(struct inet6_ifaddr *ifp)
1231 {
1232 if (ifp->flags&IFA_F_PERMANENT) {
1233 spin_lock_bh(&ifp->lock);
1234 addrconf_del_timer(ifp);
1235 ifp->flags |= IFA_F_TENTATIVE;
1236 spin_unlock_bh(&ifp->lock);
1237 in6_ifa_put(ifp);
1238 #ifdef CONFIG_IPV6_PRIVACY
1239 } else if (ifp->flags&IFA_F_TEMPORARY) {
1240 struct inet6_ifaddr *ifpub;
1241 spin_lock_bh(&ifp->lock);
1242 ifpub = ifp->ifpub;
1243 if (ifpub) {
1244 in6_ifa_hold(ifpub);
1245 spin_unlock_bh(&ifp->lock);
1246 ipv6_create_tempaddr(ifpub, ifp);
1247 in6_ifa_put(ifpub);
1248 } else {
1249 spin_unlock_bh(&ifp->lock);
1250 }
1251 ipv6_del_addr(ifp);
1252 #endif
1253 } else
1254 ipv6_del_addr(ifp);
1255 }
1256
1257 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1258 {
1259 if (net_ratelimit())
1260 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1261 addrconf_dad_stop(ifp);
1262 }
1263
1264 /* Join to solicited addr multicast group. */
1265
1266 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1267 {
1268 struct in6_addr maddr;
1269
1270 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1271 return;
1272
1273 addrconf_addr_solict_mult(addr, &maddr);
1274 ipv6_dev_mc_inc(dev, &maddr);
1275 }
1276
1277 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1278 {
1279 struct in6_addr maddr;
1280
1281 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1282 return;
1283
1284 addrconf_addr_solict_mult(addr, &maddr);
1285 __ipv6_dev_mc_dec(idev, &maddr);
1286 }
1287
1288 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1289 {
1290 struct in6_addr addr;
1291 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1292 if (ipv6_addr_any(&addr))
1293 return;
1294 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1295 }
1296
1297 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1298 {
1299 struct in6_addr addr;
1300 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1301 if (ipv6_addr_any(&addr))
1302 return;
1303 __ipv6_dev_ac_dec(ifp->idev, &addr);
1304 }
1305
1306 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1307 {
1308 if (dev->addr_len != ETH_ALEN)
1309 return -1;
1310 memcpy(eui, dev->dev_addr, 3);
1311 memcpy(eui + 5, dev->dev_addr + 3, 3);
1312
1313 /*
1314 * The zSeries OSA network cards can be shared among various
1315 * OS instances, but the OSA cards have only one MAC address.
1316 * This leads to duplicate address conflicts in conjunction
1317 * with IPv6 if more than one instance uses the same card.
1318 *
1319 * The driver for these cards can deliver a unique 16-bit
1320 * identifier for each instance sharing the same card. It is
1321 * placed instead of 0xFFFE in the interface identifier. The
1322 * "u" bit of the interface identifier is not inverted in this
1323 * case. Hence the resulting interface identifier has local
1324 * scope according to RFC2373.
1325 */
1326 if (dev->dev_id) {
1327 eui[3] = (dev->dev_id >> 8) & 0xFF;
1328 eui[4] = dev->dev_id & 0xFF;
1329 } else {
1330 eui[3] = 0xFF;
1331 eui[4] = 0xFE;
1332 eui[0] ^= 2;
1333 }
1334 return 0;
1335 }
1336
1337 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1338 {
1339 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1340 if (dev->addr_len != ARCNET_ALEN)
1341 return -1;
1342 memset(eui, 0, 7);
1343 eui[7] = *(u8*)dev->dev_addr;
1344 return 0;
1345 }
1346
1347 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1348 {
1349 if (dev->addr_len != INFINIBAND_ALEN)
1350 return -1;
1351 memcpy(eui, dev->dev_addr + 12, 8);
1352 eui[0] |= 2;
1353 return 0;
1354 }
1355
1356 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1357 {
1358 switch (dev->type) {
1359 case ARPHRD_ETHER:
1360 case ARPHRD_FDDI:
1361 case ARPHRD_IEEE802_TR:
1362 return addrconf_ifid_eui48(eui, dev);
1363 case ARPHRD_ARCNET:
1364 return addrconf_ifid_arcnet(eui, dev);
1365 case ARPHRD_INFINIBAND:
1366 return addrconf_ifid_infiniband(eui, dev);
1367 }
1368 return -1;
1369 }
1370
1371 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1372 {
1373 int err = -1;
1374 struct inet6_ifaddr *ifp;
1375
1376 read_lock_bh(&idev->lock);
1377 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1378 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1379 memcpy(eui, ifp->addr.s6_addr+8, 8);
1380 err = 0;
1381 break;
1382 }
1383 }
1384 read_unlock_bh(&idev->lock);
1385 return err;
1386 }
1387
1388 #ifdef CONFIG_IPV6_PRIVACY
1389 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1390 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1391 {
1392 regen:
1393 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1394 idev->rndid[0] &= ~0x02;
1395
1396 /*
1397 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1398 * check if generated address is not inappropriate
1399 *
1400 * - Reserved subnet anycast (RFC 2526)
1401 * 11111101 11....11 1xxxxxxx
1402 * - ISATAP (draft-ietf-ngtrans-isatap-13.txt) 5.1
1403 * 00-00-5E-FE-xx-xx-xx-xx
1404 * - value 0
1405 * - XXX: already assigned to an address on the device
1406 */
1407 if (idev->rndid[0] == 0xfd &&
1408 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1409 (idev->rndid[7]&0x80))
1410 goto regen;
1411 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1412 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1413 goto regen;
1414 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1415 goto regen;
1416 }
1417
1418 return 0;
1419 }
1420
1421 static void ipv6_regen_rndid(unsigned long data)
1422 {
1423 struct inet6_dev *idev = (struct inet6_dev *) data;
1424 unsigned long expires;
1425
1426 rcu_read_lock_bh();
1427 write_lock_bh(&idev->lock);
1428
1429 if (idev->dead)
1430 goto out;
1431
1432 if (__ipv6_regen_rndid(idev) < 0)
1433 goto out;
1434
1435 expires = jiffies +
1436 idev->cnf.temp_prefered_lft * HZ -
1437 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1438 if (time_before(expires, jiffies)) {
1439 printk(KERN_WARNING
1440 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1441 idev->dev->name);
1442 goto out;
1443 }
1444
1445 if (!mod_timer(&idev->regen_timer, expires))
1446 in6_dev_hold(idev);
1447
1448 out:
1449 write_unlock_bh(&idev->lock);
1450 rcu_read_unlock_bh();
1451 in6_dev_put(idev);
1452 }
1453
1454 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1455 int ret = 0;
1456
1457 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1458 ret = __ipv6_regen_rndid(idev);
1459 return ret;
1460 }
1461 #endif
1462
1463 /*
1464 * Add prefix route.
1465 */
1466
1467 static void
1468 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1469 unsigned long expires, u32 flags)
1470 {
1471 struct fib6_config cfg = {
1472 .fc_table = RT6_TABLE_PREFIX,
1473 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1474 .fc_ifindex = dev->ifindex,
1475 .fc_expires = expires,
1476 .fc_dst_len = plen,
1477 .fc_flags = RTF_UP | flags,
1478 };
1479
1480 ipv6_addr_copy(&cfg.fc_dst, pfx);
1481
1482 /* Prevent useless cloning on PtP SIT.
1483 This thing is done here expecting that the whole
1484 class of non-broadcast devices need not cloning.
1485 */
1486 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1487 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1488 cfg.fc_flags |= RTF_NONEXTHOP;
1489 #endif
1490
1491 ip6_route_add(&cfg);
1492 }
1493
1494 /* Create "default" multicast route to the interface */
1495
1496 static void addrconf_add_mroute(struct net_device *dev)
1497 {
1498 struct fib6_config cfg = {
1499 .fc_table = RT6_TABLE_LOCAL,
1500 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1501 .fc_ifindex = dev->ifindex,
1502 .fc_dst_len = 8,
1503 .fc_flags = RTF_UP,
1504 };
1505
1506 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1507
1508 ip6_route_add(&cfg);
1509 }
1510
1511 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1512 static void sit_route_add(struct net_device *dev)
1513 {
1514 struct fib6_config cfg = {
1515 .fc_table = RT6_TABLE_MAIN,
1516 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1517 .fc_ifindex = dev->ifindex,
1518 .fc_dst_len = 96,
1519 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1520 };
1521
1522 /* prefix length - 96 bits "::d.d.d.d" */
1523 ip6_route_add(&cfg);
1524 }
1525 #endif
1526
1527 static void addrconf_add_lroute(struct net_device *dev)
1528 {
1529 struct in6_addr addr;
1530
1531 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1532 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1533 }
1534
1535 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1536 {
1537 struct inet6_dev *idev;
1538
1539 ASSERT_RTNL();
1540
1541 if ((idev = ipv6_find_idev(dev)) == NULL)
1542 return NULL;
1543
1544 /* Add default multicast route */
1545 addrconf_add_mroute(dev);
1546
1547 /* Add link local route */
1548 addrconf_add_lroute(dev);
1549 return idev;
1550 }
1551
1552 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1553 {
1554 struct prefix_info *pinfo;
1555 __u32 valid_lft;
1556 __u32 prefered_lft;
1557 int addr_type;
1558 unsigned long rt_expires;
1559 struct inet6_dev *in6_dev;
1560
1561 pinfo = (struct prefix_info *) opt;
1562
1563 if (len < sizeof(struct prefix_info)) {
1564 ADBG(("addrconf: prefix option too short\n"));
1565 return;
1566 }
1567
1568 /*
1569 * Validation checks ([ADDRCONF], page 19)
1570 */
1571
1572 addr_type = ipv6_addr_type(&pinfo->prefix);
1573
1574 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1575 return;
1576
1577 valid_lft = ntohl(pinfo->valid);
1578 prefered_lft = ntohl(pinfo->prefered);
1579
1580 if (prefered_lft > valid_lft) {
1581 if (net_ratelimit())
1582 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1583 return;
1584 }
1585
1586 in6_dev = in6_dev_get(dev);
1587
1588 if (in6_dev == NULL) {
1589 if (net_ratelimit())
1590 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1591 return;
1592 }
1593
1594 /*
1595 * Two things going on here:
1596 * 1) Add routes for on-link prefixes
1597 * 2) Configure prefixes with the auto flag set
1598 */
1599
1600 /* Avoid arithmetic overflow. Really, we could
1601 save rt_expires in seconds, likely valid_lft,
1602 but it would require division in fib gc, that it
1603 not good.
1604 */
1605 if (valid_lft >= 0x7FFFFFFF/HZ)
1606 rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ);
1607 else
1608 rt_expires = valid_lft * HZ;
1609
1610 /*
1611 * We convert this (in jiffies) to clock_t later.
1612 * Avoid arithmetic overflow there as well.
1613 * Overflow can happen only if HZ < USER_HZ.
1614 */
1615 if (HZ < USER_HZ && rt_expires > 0x7FFFFFFF / USER_HZ)
1616 rt_expires = 0x7FFFFFFF / USER_HZ;
1617
1618 if (pinfo->onlink) {
1619 struct rt6_info *rt;
1620 rt = rt6_lookup(&pinfo->prefix, NULL, dev->ifindex, 1);
1621
1622 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
1623 if (rt->rt6i_flags&RTF_EXPIRES) {
1624 if (valid_lft == 0) {
1625 ip6_del_rt(rt);
1626 rt = NULL;
1627 } else {
1628 rt->rt6i_expires = jiffies + rt_expires;
1629 }
1630 }
1631 } else if (valid_lft) {
1632 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1633 dev, jiffies_to_clock_t(rt_expires), RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT);
1634 }
1635 if (rt)
1636 dst_release(&rt->u.dst);
1637 }
1638
1639 /* Try to figure out our local address for this prefix */
1640
1641 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1642 struct inet6_ifaddr * ifp;
1643 struct in6_addr addr;
1644 int create = 0, update_lft = 0;
1645
1646 if (pinfo->prefix_len == 64) {
1647 memcpy(&addr, &pinfo->prefix, 8);
1648 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1649 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1650 in6_dev_put(in6_dev);
1651 return;
1652 }
1653 goto ok;
1654 }
1655 if (net_ratelimit())
1656 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1657 pinfo->prefix_len);
1658 in6_dev_put(in6_dev);
1659 return;
1660
1661 ok:
1662
1663 ifp = ipv6_get_ifaddr(&addr, dev, 1);
1664
1665 if (ifp == NULL && valid_lft) {
1666 int max_addresses = in6_dev->cnf.max_addresses;
1667
1668 /* Do not allow to create too much of autoconfigured
1669 * addresses; this would be too easy way to crash kernel.
1670 */
1671 if (!max_addresses ||
1672 ipv6_count_addresses(in6_dev) < max_addresses)
1673 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1674 addr_type&IPV6_ADDR_SCOPE_MASK, 0);
1675
1676 if (!ifp || IS_ERR(ifp)) {
1677 in6_dev_put(in6_dev);
1678 return;
1679 }
1680
1681 update_lft = create = 1;
1682 ifp->cstamp = jiffies;
1683 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1684 }
1685
1686 if (ifp) {
1687 int flags;
1688 unsigned long now;
1689 #ifdef CONFIG_IPV6_PRIVACY
1690 struct inet6_ifaddr *ift;
1691 #endif
1692 u32 stored_lft;
1693
1694 /* update lifetime (RFC2462 5.5.3 e) */
1695 spin_lock(&ifp->lock);
1696 now = jiffies;
1697 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1698 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1699 else
1700 stored_lft = 0;
1701 if (!update_lft && stored_lft) {
1702 if (valid_lft > MIN_VALID_LIFETIME ||
1703 valid_lft > stored_lft)
1704 update_lft = 1;
1705 else if (stored_lft <= MIN_VALID_LIFETIME) {
1706 /* valid_lft <= stored_lft is always true */
1707 /* XXX: IPsec */
1708 update_lft = 0;
1709 } else {
1710 valid_lft = MIN_VALID_LIFETIME;
1711 if (valid_lft < prefered_lft)
1712 prefered_lft = valid_lft;
1713 update_lft = 1;
1714 }
1715 }
1716
1717 if (update_lft) {
1718 ifp->valid_lft = valid_lft;
1719 ifp->prefered_lft = prefered_lft;
1720 ifp->tstamp = now;
1721 flags = ifp->flags;
1722 ifp->flags &= ~IFA_F_DEPRECATED;
1723 spin_unlock(&ifp->lock);
1724
1725 if (!(flags&IFA_F_TENTATIVE))
1726 ipv6_ifa_notify(0, ifp);
1727 } else
1728 spin_unlock(&ifp->lock);
1729
1730 #ifdef CONFIG_IPV6_PRIVACY
1731 read_lock_bh(&in6_dev->lock);
1732 /* update all temporary addresses in the list */
1733 for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1734 /*
1735 * When adjusting the lifetimes of an existing
1736 * temporary address, only lower the lifetimes.
1737 * Implementations must not increase the
1738 * lifetimes of an existing temporary address
1739 * when processing a Prefix Information Option.
1740 */
1741 spin_lock(&ift->lock);
1742 flags = ift->flags;
1743 if (ift->valid_lft > valid_lft &&
1744 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1745 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1746 if (ift->prefered_lft > prefered_lft &&
1747 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1748 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1749 spin_unlock(&ift->lock);
1750 if (!(flags&IFA_F_TENTATIVE))
1751 ipv6_ifa_notify(0, ift);
1752 }
1753
1754 if (create && in6_dev->cnf.use_tempaddr > 0) {
1755 /*
1756 * When a new public address is created as described in [ADDRCONF],
1757 * also create a new temporary address.
1758 */
1759 read_unlock_bh(&in6_dev->lock);
1760 ipv6_create_tempaddr(ifp, NULL);
1761 } else {
1762 read_unlock_bh(&in6_dev->lock);
1763 }
1764 #endif
1765 in6_ifa_put(ifp);
1766 addrconf_verify(0);
1767 }
1768 }
1769 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
1770 in6_dev_put(in6_dev);
1771 }
1772
1773 /*
1774 * Set destination address.
1775 * Special case for SIT interfaces where we create a new "virtual"
1776 * device.
1777 */
1778 int addrconf_set_dstaddr(void __user *arg)
1779 {
1780 struct in6_ifreq ireq;
1781 struct net_device *dev;
1782 int err = -EINVAL;
1783
1784 rtnl_lock();
1785
1786 err = -EFAULT;
1787 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1788 goto err_exit;
1789
1790 dev = __dev_get_by_index(ireq.ifr6_ifindex);
1791
1792 err = -ENODEV;
1793 if (dev == NULL)
1794 goto err_exit;
1795
1796 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1797 if (dev->type == ARPHRD_SIT) {
1798 struct ifreq ifr;
1799 mm_segment_t oldfs;
1800 struct ip_tunnel_parm p;
1801
1802 err = -EADDRNOTAVAIL;
1803 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
1804 goto err_exit;
1805
1806 memset(&p, 0, sizeof(p));
1807 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
1808 p.iph.saddr = 0;
1809 p.iph.version = 4;
1810 p.iph.ihl = 5;
1811 p.iph.protocol = IPPROTO_IPV6;
1812 p.iph.ttl = 64;
1813 ifr.ifr_ifru.ifru_data = (void __user *)&p;
1814
1815 oldfs = get_fs(); set_fs(KERNEL_DS);
1816 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
1817 set_fs(oldfs);
1818
1819 if (err == 0) {
1820 err = -ENOBUFS;
1821 if ((dev = __dev_get_by_name(p.name)) == NULL)
1822 goto err_exit;
1823 err = dev_open(dev);
1824 }
1825 }
1826 #endif
1827
1828 err_exit:
1829 rtnl_unlock();
1830 return err;
1831 }
1832
1833 /*
1834 * Manual configuration of address on an interface
1835 */
1836 static int inet6_addr_add(int ifindex, struct in6_addr *pfx, int plen,
1837 __u8 ifa_flags, __u32 prefered_lft, __u32 valid_lft)
1838 {
1839 struct inet6_ifaddr *ifp;
1840 struct inet6_dev *idev;
1841 struct net_device *dev;
1842 int scope;
1843 u32 flags = RTF_EXPIRES;
1844
1845 ASSERT_RTNL();
1846
1847 /* check the lifetime */
1848 if (!valid_lft || prefered_lft > valid_lft)
1849 return -EINVAL;
1850
1851 if ((dev = __dev_get_by_index(ifindex)) == NULL)
1852 return -ENODEV;
1853
1854 if ((idev = addrconf_add_dev(dev)) == NULL)
1855 return -ENOBUFS;
1856
1857 scope = ipv6_addr_scope(pfx);
1858
1859 if (valid_lft == INFINITY_LIFE_TIME) {
1860 ifa_flags |= IFA_F_PERMANENT;
1861 flags = 0;
1862 } else if (valid_lft >= 0x7FFFFFFF/HZ)
1863 valid_lft = 0x7FFFFFFF/HZ;
1864
1865 if (prefered_lft == 0)
1866 ifa_flags |= IFA_F_DEPRECATED;
1867 else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
1868 (prefered_lft != INFINITY_LIFE_TIME))
1869 prefered_lft = 0x7FFFFFFF/HZ;
1870
1871 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
1872
1873 if (!IS_ERR(ifp)) {
1874 spin_lock_bh(&ifp->lock);
1875 ifp->valid_lft = valid_lft;
1876 ifp->prefered_lft = prefered_lft;
1877 ifp->tstamp = jiffies;
1878 spin_unlock_bh(&ifp->lock);
1879
1880 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
1881 jiffies_to_clock_t(valid_lft * HZ), flags);
1882 addrconf_dad_start(ifp, 0);
1883 in6_ifa_put(ifp);
1884 addrconf_verify(0);
1885 return 0;
1886 }
1887
1888 return PTR_ERR(ifp);
1889 }
1890
1891 static int inet6_addr_del(int ifindex, struct in6_addr *pfx, int plen)
1892 {
1893 struct inet6_ifaddr *ifp;
1894 struct inet6_dev *idev;
1895 struct net_device *dev;
1896
1897 if ((dev = __dev_get_by_index(ifindex)) == NULL)
1898 return -ENODEV;
1899
1900 if ((idev = __in6_dev_get(dev)) == NULL)
1901 return -ENXIO;
1902
1903 read_lock_bh(&idev->lock);
1904 for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
1905 if (ifp->prefix_len == plen &&
1906 ipv6_addr_equal(pfx, &ifp->addr)) {
1907 in6_ifa_hold(ifp);
1908 read_unlock_bh(&idev->lock);
1909
1910 ipv6_del_addr(ifp);
1911
1912 /* If the last address is deleted administratively,
1913 disable IPv6 on this interface.
1914 */
1915 if (idev->addr_list == NULL)
1916 addrconf_ifdown(idev->dev, 1);
1917 return 0;
1918 }
1919 }
1920 read_unlock_bh(&idev->lock);
1921 return -EADDRNOTAVAIL;
1922 }
1923
1924
1925 int addrconf_add_ifaddr(void __user *arg)
1926 {
1927 struct in6_ifreq ireq;
1928 int err;
1929
1930 if (!capable(CAP_NET_ADMIN))
1931 return -EPERM;
1932
1933 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1934 return -EFAULT;
1935
1936 rtnl_lock();
1937 err = inet6_addr_add(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen,
1938 IFA_F_PERMANENT, INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1939 rtnl_unlock();
1940 return err;
1941 }
1942
1943 int addrconf_del_ifaddr(void __user *arg)
1944 {
1945 struct in6_ifreq ireq;
1946 int err;
1947
1948 if (!capable(CAP_NET_ADMIN))
1949 return -EPERM;
1950
1951 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1952 return -EFAULT;
1953
1954 rtnl_lock();
1955 err = inet6_addr_del(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
1956 rtnl_unlock();
1957 return err;
1958 }
1959
1960 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1961 static void sit_add_v4_addrs(struct inet6_dev *idev)
1962 {
1963 struct inet6_ifaddr * ifp;
1964 struct in6_addr addr;
1965 struct net_device *dev;
1966 int scope;
1967
1968 ASSERT_RTNL();
1969
1970 memset(&addr, 0, sizeof(struct in6_addr));
1971 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
1972
1973 if (idev->dev->flags&IFF_POINTOPOINT) {
1974 addr.s6_addr32[0] = htonl(0xfe800000);
1975 scope = IFA_LINK;
1976 } else {
1977 scope = IPV6_ADDR_COMPATv4;
1978 }
1979
1980 if (addr.s6_addr32[3]) {
1981 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
1982 if (!IS_ERR(ifp)) {
1983 spin_lock_bh(&ifp->lock);
1984 ifp->flags &= ~IFA_F_TENTATIVE;
1985 spin_unlock_bh(&ifp->lock);
1986 ipv6_ifa_notify(RTM_NEWADDR, ifp);
1987 in6_ifa_put(ifp);
1988 }
1989 return;
1990 }
1991
1992 for (dev = dev_base; dev != NULL; dev = dev->next) {
1993 struct in_device * in_dev = __in_dev_get_rtnl(dev);
1994 if (in_dev && (dev->flags & IFF_UP)) {
1995 struct in_ifaddr * ifa;
1996
1997 int flag = scope;
1998
1999 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2000 int plen;
2001
2002 addr.s6_addr32[3] = ifa->ifa_local;
2003
2004 if (ifa->ifa_scope == RT_SCOPE_LINK)
2005 continue;
2006 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2007 if (idev->dev->flags&IFF_POINTOPOINT)
2008 continue;
2009 flag |= IFA_HOST;
2010 }
2011 if (idev->dev->flags&IFF_POINTOPOINT)
2012 plen = 64;
2013 else
2014 plen = 96;
2015
2016 ifp = ipv6_add_addr(idev, &addr, plen, flag,
2017 IFA_F_PERMANENT);
2018 if (!IS_ERR(ifp)) {
2019 spin_lock_bh(&ifp->lock);
2020 ifp->flags &= ~IFA_F_TENTATIVE;
2021 spin_unlock_bh(&ifp->lock);
2022 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2023 in6_ifa_put(ifp);
2024 }
2025 }
2026 }
2027 }
2028 }
2029 #endif
2030
2031 static void init_loopback(struct net_device *dev)
2032 {
2033 struct inet6_dev *idev;
2034 struct inet6_ifaddr * ifp;
2035
2036 /* ::1 */
2037
2038 ASSERT_RTNL();
2039
2040 if ((idev = ipv6_find_idev(dev)) == NULL) {
2041 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2042 return;
2043 }
2044
2045 ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
2046 if (!IS_ERR(ifp)) {
2047 spin_lock_bh(&ifp->lock);
2048 ifp->flags &= ~IFA_F_TENTATIVE;
2049 spin_unlock_bh(&ifp->lock);
2050 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2051 in6_ifa_put(ifp);
2052 }
2053 }
2054
2055 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2056 {
2057 struct inet6_ifaddr * ifp;
2058
2059 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, IFA_F_PERMANENT);
2060 if (!IS_ERR(ifp)) {
2061 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2062 addrconf_dad_start(ifp, 0);
2063 in6_ifa_put(ifp);
2064 }
2065 }
2066
2067 static void addrconf_dev_config(struct net_device *dev)
2068 {
2069 struct in6_addr addr;
2070 struct inet6_dev * idev;
2071
2072 ASSERT_RTNL();
2073
2074 if ((dev->type != ARPHRD_ETHER) &&
2075 (dev->type != ARPHRD_FDDI) &&
2076 (dev->type != ARPHRD_IEEE802_TR) &&
2077 (dev->type != ARPHRD_ARCNET) &&
2078 (dev->type != ARPHRD_INFINIBAND)) {
2079 /* Alas, we support only Ethernet autoconfiguration. */
2080 return;
2081 }
2082
2083 idev = addrconf_add_dev(dev);
2084 if (idev == NULL)
2085 return;
2086
2087 memset(&addr, 0, sizeof(struct in6_addr));
2088 addr.s6_addr32[0] = htonl(0xFE800000);
2089
2090 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2091 addrconf_add_linklocal(idev, &addr);
2092 }
2093
2094 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2095 static void addrconf_sit_config(struct net_device *dev)
2096 {
2097 struct inet6_dev *idev;
2098
2099 ASSERT_RTNL();
2100
2101 /*
2102 * Configure the tunnel with one of our IPv4
2103 * addresses... we should configure all of
2104 * our v4 addrs in the tunnel
2105 */
2106
2107 if ((idev = ipv6_find_idev(dev)) == NULL) {
2108 printk(KERN_DEBUG "init sit: add_dev failed\n");
2109 return;
2110 }
2111
2112 sit_add_v4_addrs(idev);
2113
2114 if (dev->flags&IFF_POINTOPOINT) {
2115 addrconf_add_mroute(dev);
2116 addrconf_add_lroute(dev);
2117 } else
2118 sit_route_add(dev);
2119 }
2120 #endif
2121
2122 static inline int
2123 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2124 {
2125 struct in6_addr lladdr;
2126
2127 if (!ipv6_get_lladdr(link_dev, &lladdr)) {
2128 addrconf_add_linklocal(idev, &lladdr);
2129 return 0;
2130 }
2131 return -1;
2132 }
2133
2134 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2135 {
2136 struct net_device *link_dev;
2137
2138 /* first try to inherit the link-local address from the link device */
2139 if (idev->dev->iflink &&
2140 (link_dev = __dev_get_by_index(idev->dev->iflink))) {
2141 if (!ipv6_inherit_linklocal(idev, link_dev))
2142 return;
2143 }
2144 /* then try to inherit it from any device */
2145 for (link_dev = dev_base; link_dev; link_dev = link_dev->next) {
2146 if (!ipv6_inherit_linklocal(idev, link_dev))
2147 return;
2148 }
2149 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2150 }
2151
2152 /*
2153 * Autoconfigure tunnel with a link-local address so routing protocols,
2154 * DHCPv6, MLD etc. can be run over the virtual link
2155 */
2156
2157 static void addrconf_ip6_tnl_config(struct net_device *dev)
2158 {
2159 struct inet6_dev *idev;
2160
2161 ASSERT_RTNL();
2162
2163 if ((idev = addrconf_add_dev(dev)) == NULL) {
2164 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2165 return;
2166 }
2167 ip6_tnl_add_linklocal(idev);
2168 }
2169
2170 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2171 void * data)
2172 {
2173 struct net_device *dev = (struct net_device *) data;
2174 struct inet6_dev *idev = __in6_dev_get(dev);
2175 int run_pending = 0;
2176
2177 switch(event) {
2178 case NETDEV_REGISTER:
2179 if (!idev) {
2180 idev = ipv6_add_dev(dev);
2181 if (!idev)
2182 printk(KERN_WARNING "IPv6: add_dev failed for %s\n",
2183 dev->name);
2184 }
2185 break;
2186 case NETDEV_UP:
2187 case NETDEV_CHANGE:
2188 if (event == NETDEV_UP) {
2189 if (!netif_carrier_ok(dev)) {
2190 /* device is not ready yet. */
2191 printk(KERN_INFO
2192 "ADDRCONF(NETDEV_UP): %s: "
2193 "link is not ready\n",
2194 dev->name);
2195 break;
2196 }
2197
2198 if (idev)
2199 idev->if_flags |= IF_READY;
2200 } else {
2201 if (!netif_carrier_ok(dev)) {
2202 /* device is still not ready. */
2203 break;
2204 }
2205
2206 if (idev) {
2207 if (idev->if_flags & IF_READY) {
2208 /* device is already configured. */
2209 break;
2210 }
2211 idev->if_flags |= IF_READY;
2212 }
2213
2214 printk(KERN_INFO
2215 "ADDRCONF(NETDEV_CHANGE): %s: "
2216 "link becomes ready\n",
2217 dev->name);
2218
2219 run_pending = 1;
2220 }
2221
2222 switch(dev->type) {
2223 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2224 case ARPHRD_SIT:
2225 addrconf_sit_config(dev);
2226 break;
2227 #endif
2228 case ARPHRD_TUNNEL6:
2229 addrconf_ip6_tnl_config(dev);
2230 break;
2231 case ARPHRD_LOOPBACK:
2232 init_loopback(dev);
2233 break;
2234
2235 default:
2236 addrconf_dev_config(dev);
2237 break;
2238 };
2239 if (idev) {
2240 if (run_pending)
2241 addrconf_dad_run(idev);
2242
2243 /* If the MTU changed during the interface down, when the
2244 interface up, the changed MTU must be reflected in the
2245 idev as well as routers.
2246 */
2247 if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2248 rt6_mtu_change(dev, dev->mtu);
2249 idev->cnf.mtu6 = dev->mtu;
2250 }
2251 idev->tstamp = jiffies;
2252 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2253 /* If the changed mtu during down is lower than IPV6_MIN_MTU
2254 stop IPv6 on this interface.
2255 */
2256 if (dev->mtu < IPV6_MIN_MTU)
2257 addrconf_ifdown(dev, event != NETDEV_DOWN);
2258 }
2259 break;
2260
2261 case NETDEV_CHANGEMTU:
2262 if ( idev && dev->mtu >= IPV6_MIN_MTU) {
2263 rt6_mtu_change(dev, dev->mtu);
2264 idev->cnf.mtu6 = dev->mtu;
2265 break;
2266 }
2267
2268 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2269
2270 case NETDEV_DOWN:
2271 case NETDEV_UNREGISTER:
2272 /*
2273 * Remove all addresses from this interface.
2274 */
2275 addrconf_ifdown(dev, event != NETDEV_DOWN);
2276 break;
2277
2278 case NETDEV_CHANGENAME:
2279 #ifdef CONFIG_SYSCTL
2280 if (idev) {
2281 addrconf_sysctl_unregister(&idev->cnf);
2282 neigh_sysctl_unregister(idev->nd_parms);
2283 neigh_sysctl_register(dev, idev->nd_parms,
2284 NET_IPV6, NET_IPV6_NEIGH, "ipv6",
2285 &ndisc_ifinfo_sysctl_change,
2286 NULL);
2287 addrconf_sysctl_register(idev, &idev->cnf);
2288 }
2289 #endif
2290 break;
2291 };
2292
2293 return NOTIFY_OK;
2294 }
2295
2296 /*
2297 * addrconf module should be notified of a device going up
2298 */
2299 static struct notifier_block ipv6_dev_notf = {
2300 .notifier_call = addrconf_notify,
2301 .priority = 0
2302 };
2303
2304 static int addrconf_ifdown(struct net_device *dev, int how)
2305 {
2306 struct inet6_dev *idev;
2307 struct inet6_ifaddr *ifa, **bifa;
2308 int i;
2309
2310 ASSERT_RTNL();
2311
2312 if (dev == &loopback_dev && how == 1)
2313 how = 0;
2314
2315 rt6_ifdown(dev);
2316 neigh_ifdown(&nd_tbl, dev);
2317
2318 idev = __in6_dev_get(dev);
2319 if (idev == NULL)
2320 return -ENODEV;
2321
2322 /* Step 1: remove reference to ipv6 device from parent device.
2323 Do not dev_put!
2324 */
2325 if (how == 1) {
2326 idev->dead = 1;
2327
2328 /* protected by rtnl_lock */
2329 rcu_assign_pointer(dev->ip6_ptr, NULL);
2330
2331 /* Step 1.5: remove snmp6 entry */
2332 snmp6_unregister_dev(idev);
2333
2334 }
2335
2336 /* Step 2: clear hash table */
2337 for (i=0; i<IN6_ADDR_HSIZE; i++) {
2338 bifa = &inet6_addr_lst[i];
2339
2340 write_lock_bh(&addrconf_hash_lock);
2341 while ((ifa = *bifa) != NULL) {
2342 if (ifa->idev == idev) {
2343 *bifa = ifa->lst_next;
2344 ifa->lst_next = NULL;
2345 addrconf_del_timer(ifa);
2346 in6_ifa_put(ifa);
2347 continue;
2348 }
2349 bifa = &ifa->lst_next;
2350 }
2351 write_unlock_bh(&addrconf_hash_lock);
2352 }
2353
2354 write_lock_bh(&idev->lock);
2355
2356 /* Step 3: clear flags for stateless addrconf */
2357 if (how != 1)
2358 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2359
2360 /* Step 4: clear address list */
2361 #ifdef CONFIG_IPV6_PRIVACY
2362 if (how == 1 && del_timer(&idev->regen_timer))
2363 in6_dev_put(idev);
2364
2365 /* clear tempaddr list */
2366 while ((ifa = idev->tempaddr_list) != NULL) {
2367 idev->tempaddr_list = ifa->tmp_next;
2368 ifa->tmp_next = NULL;
2369 ifa->dead = 1;
2370 write_unlock_bh(&idev->lock);
2371 spin_lock_bh(&ifa->lock);
2372
2373 if (ifa->ifpub) {
2374 in6_ifa_put(ifa->ifpub);
2375 ifa->ifpub = NULL;
2376 }
2377 spin_unlock_bh(&ifa->lock);
2378 in6_ifa_put(ifa);
2379 write_lock_bh(&idev->lock);
2380 }
2381 #endif
2382 while ((ifa = idev->addr_list) != NULL) {
2383 idev->addr_list = ifa->if_next;
2384 ifa->if_next = NULL;
2385 ifa->dead = 1;
2386 addrconf_del_timer(ifa);
2387 write_unlock_bh(&idev->lock);
2388
2389 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2390 in6_ifa_put(ifa);
2391
2392 write_lock_bh(&idev->lock);
2393 }
2394 write_unlock_bh(&idev->lock);
2395
2396 /* Step 5: Discard multicast list */
2397
2398 if (how == 1)
2399 ipv6_mc_destroy_dev(idev);
2400 else
2401 ipv6_mc_down(idev);
2402
2403 /* Step 5: netlink notification of this interface */
2404 idev->tstamp = jiffies;
2405 inet6_ifinfo_notify(RTM_DELLINK, idev);
2406
2407 /* Shot the device (if unregistered) */
2408
2409 if (how == 1) {
2410 #ifdef CONFIG_SYSCTL
2411 addrconf_sysctl_unregister(&idev->cnf);
2412 neigh_sysctl_unregister(idev->nd_parms);
2413 #endif
2414 neigh_parms_release(&nd_tbl, idev->nd_parms);
2415 neigh_ifdown(&nd_tbl, dev);
2416 in6_dev_put(idev);
2417 }
2418 return 0;
2419 }
2420
2421 static void addrconf_rs_timer(unsigned long data)
2422 {
2423 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2424
2425 if (ifp->idev->cnf.forwarding)
2426 goto out;
2427
2428 if (ifp->idev->if_flags & IF_RA_RCVD) {
2429 /*
2430 * Announcement received after solicitation
2431 * was sent
2432 */
2433 goto out;
2434 }
2435
2436 spin_lock(&ifp->lock);
2437 if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2438 struct in6_addr all_routers;
2439
2440 /* The wait after the last probe can be shorter */
2441 addrconf_mod_timer(ifp, AC_RS,
2442 (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2443 ifp->idev->cnf.rtr_solicit_delay :
2444 ifp->idev->cnf.rtr_solicit_interval);
2445 spin_unlock(&ifp->lock);
2446
2447 ipv6_addr_all_routers(&all_routers);
2448
2449 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2450 } else {
2451 spin_unlock(&ifp->lock);
2452 /*
2453 * Note: we do not support deprecated "all on-link"
2454 * assumption any longer.
2455 */
2456 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2457 ifp->idev->dev->name);
2458 }
2459
2460 out:
2461 in6_ifa_put(ifp);
2462 }
2463
2464 /*
2465 * Duplicate Address Detection
2466 */
2467 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2468 {
2469 unsigned long rand_num;
2470 struct inet6_dev *idev = ifp->idev;
2471
2472 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2473 ifp->probes = idev->cnf.dad_transmits;
2474 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2475 }
2476
2477 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2478 {
2479 struct inet6_dev *idev = ifp->idev;
2480 struct net_device *dev = idev->dev;
2481
2482 addrconf_join_solict(dev, &ifp->addr);
2483
2484 net_srandom(ifp->addr.s6_addr32[3]);
2485
2486 read_lock_bh(&idev->lock);
2487 if (ifp->dead)
2488 goto out;
2489 spin_lock_bh(&ifp->lock);
2490
2491 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2492 !(ifp->flags&IFA_F_TENTATIVE) ||
2493 ifp->flags & IFA_F_NODAD) {
2494 ifp->flags &= ~IFA_F_TENTATIVE;
2495 spin_unlock_bh(&ifp->lock);
2496 read_unlock_bh(&idev->lock);
2497
2498 addrconf_dad_completed(ifp);
2499 return;
2500 }
2501
2502 if (!(idev->if_flags & IF_READY)) {
2503 spin_unlock_bh(&ifp->lock);
2504 read_unlock_bh(&idev->lock);
2505 /*
2506 * If the defice is not ready:
2507 * - keep it tentative if it is a permanent address.
2508 * - otherwise, kill it.
2509 */
2510 in6_ifa_hold(ifp);
2511 addrconf_dad_stop(ifp);
2512 return;
2513 }
2514 addrconf_dad_kick(ifp);
2515 spin_unlock_bh(&ifp->lock);
2516 out:
2517 read_unlock_bh(&idev->lock);
2518 }
2519
2520 static void addrconf_dad_timer(unsigned long data)
2521 {
2522 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2523 struct inet6_dev *idev = ifp->idev;
2524 struct in6_addr unspec;
2525 struct in6_addr mcaddr;
2526
2527 read_lock_bh(&idev->lock);
2528 if (idev->dead) {
2529 read_unlock_bh(&idev->lock);
2530 goto out;
2531 }
2532 spin_lock_bh(&ifp->lock);
2533 if (ifp->probes == 0) {
2534 /*
2535 * DAD was successful
2536 */
2537
2538 ifp->flags &= ~IFA_F_TENTATIVE;
2539 spin_unlock_bh(&ifp->lock);
2540 read_unlock_bh(&idev->lock);
2541
2542 addrconf_dad_completed(ifp);
2543
2544 goto out;
2545 }
2546
2547 ifp->probes--;
2548 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2549 spin_unlock_bh(&ifp->lock);
2550 read_unlock_bh(&idev->lock);
2551
2552 /* send a neighbour solicitation for our addr */
2553 memset(&unspec, 0, sizeof(unspec));
2554 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2555 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec);
2556 out:
2557 in6_ifa_put(ifp);
2558 }
2559
2560 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2561 {
2562 struct net_device * dev = ifp->idev->dev;
2563
2564 /*
2565 * Configure the address for reception. Now it is valid.
2566 */
2567
2568 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2569
2570 /* If added prefix is link local and forwarding is off,
2571 start sending router solicitations.
2572 */
2573
2574 if (ifp->idev->cnf.forwarding == 0 &&
2575 ifp->idev->cnf.rtr_solicits > 0 &&
2576 (dev->flags&IFF_LOOPBACK) == 0 &&
2577 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2578 struct in6_addr all_routers;
2579
2580 ipv6_addr_all_routers(&all_routers);
2581
2582 /*
2583 * If a host as already performed a random delay
2584 * [...] as part of DAD [...] there is no need
2585 * to delay again before sending the first RS
2586 */
2587 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2588
2589 spin_lock_bh(&ifp->lock);
2590 ifp->probes = 1;
2591 ifp->idev->if_flags |= IF_RS_SENT;
2592 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2593 spin_unlock_bh(&ifp->lock);
2594 }
2595 }
2596
2597 static void addrconf_dad_run(struct inet6_dev *idev) {
2598 struct inet6_ifaddr *ifp;
2599
2600 read_lock_bh(&idev->lock);
2601 for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2602 spin_lock_bh(&ifp->lock);
2603 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2604 spin_unlock_bh(&ifp->lock);
2605 continue;
2606 }
2607 spin_unlock_bh(&ifp->lock);
2608 addrconf_dad_kick(ifp);
2609 }
2610 read_unlock_bh(&idev->lock);
2611 }
2612
2613 #ifdef CONFIG_PROC_FS
2614 struct if6_iter_state {
2615 int bucket;
2616 };
2617
2618 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2619 {
2620 struct inet6_ifaddr *ifa = NULL;
2621 struct if6_iter_state *state = seq->private;
2622
2623 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2624 ifa = inet6_addr_lst[state->bucket];
2625 if (ifa)
2626 break;
2627 }
2628 return ifa;
2629 }
2630
2631 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2632 {
2633 struct if6_iter_state *state = seq->private;
2634
2635 ifa = ifa->lst_next;
2636 try_again:
2637 if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2638 ifa = inet6_addr_lst[state->bucket];
2639 goto try_again;
2640 }
2641 return ifa;
2642 }
2643
2644 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2645 {
2646 struct inet6_ifaddr *ifa = if6_get_first(seq);
2647
2648 if (ifa)
2649 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2650 --pos;
2651 return pos ? NULL : ifa;
2652 }
2653
2654 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2655 {
2656 read_lock_bh(&addrconf_hash_lock);
2657 return if6_get_idx(seq, *pos);
2658 }
2659
2660 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2661 {
2662 struct inet6_ifaddr *ifa;
2663
2664 ifa = if6_get_next(seq, v);
2665 ++*pos;
2666 return ifa;
2667 }
2668
2669 static void if6_seq_stop(struct seq_file *seq, void *v)
2670 {
2671 read_unlock_bh(&addrconf_hash_lock);
2672 }
2673
2674 static int if6_seq_show(struct seq_file *seq, void *v)
2675 {
2676 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2677 seq_printf(seq,
2678 NIP6_SEQFMT " %02x %02x %02x %02x %8s\n",
2679 NIP6(ifp->addr),
2680 ifp->idev->dev->ifindex,
2681 ifp->prefix_len,
2682 ifp->scope,
2683 ifp->flags,
2684 ifp->idev->dev->name);
2685 return 0;
2686 }
2687
2688 static struct seq_operations if6_seq_ops = {
2689 .start = if6_seq_start,
2690 .next = if6_seq_next,
2691 .show = if6_seq_show,
2692 .stop = if6_seq_stop,
2693 };
2694
2695 static int if6_seq_open(struct inode *inode, struct file *file)
2696 {
2697 struct seq_file *seq;
2698 int rc = -ENOMEM;
2699 struct if6_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL);
2700
2701 if (!s)
2702 goto out;
2703
2704 rc = seq_open(file, &if6_seq_ops);
2705 if (rc)
2706 goto out_kfree;
2707
2708 seq = file->private_data;
2709 seq->private = s;
2710 out:
2711 return rc;
2712 out_kfree:
2713 kfree(s);
2714 goto out;
2715 }
2716
2717 static const struct file_operations if6_fops = {
2718 .owner = THIS_MODULE,
2719 .open = if6_seq_open,
2720 .read = seq_read,
2721 .llseek = seq_lseek,
2722 .release = seq_release_private,
2723 };
2724
2725 int __init if6_proc_init(void)
2726 {
2727 if (!proc_net_fops_create("if_inet6", S_IRUGO, &if6_fops))
2728 return -ENOMEM;
2729 return 0;
2730 }
2731
2732 void if6_proc_exit(void)
2733 {
2734 proc_net_remove("if_inet6");
2735 }
2736 #endif /* CONFIG_PROC_FS */
2737
2738 #ifdef CONFIG_IPV6_MIP6
2739 /* Check if address is a home address configured on any interface. */
2740 int ipv6_chk_home_addr(struct in6_addr *addr)
2741 {
2742 int ret = 0;
2743 struct inet6_ifaddr * ifp;
2744 u8 hash = ipv6_addr_hash(addr);
2745 read_lock_bh(&addrconf_hash_lock);
2746 for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) {
2747 if (ipv6_addr_cmp(&ifp->addr, addr) == 0 &&
2748 (ifp->flags & IFA_F_HOMEADDRESS)) {
2749 ret = 1;
2750 break;
2751 }
2752 }
2753 read_unlock_bh(&addrconf_hash_lock);
2754 return ret;
2755 }
2756 #endif
2757
2758 /*
2759 * Periodic address status verification
2760 */
2761
2762 static void addrconf_verify(unsigned long foo)
2763 {
2764 struct inet6_ifaddr *ifp;
2765 unsigned long now, next;
2766 int i;
2767
2768 spin_lock_bh(&addrconf_verify_lock);
2769 now = jiffies;
2770 next = now + ADDR_CHECK_FREQUENCY;
2771
2772 del_timer(&addr_chk_timer);
2773
2774 for (i=0; i < IN6_ADDR_HSIZE; i++) {
2775
2776 restart:
2777 read_lock(&addrconf_hash_lock);
2778 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
2779 unsigned long age;
2780 #ifdef CONFIG_IPV6_PRIVACY
2781 unsigned long regen_advance;
2782 #endif
2783
2784 if (ifp->flags & IFA_F_PERMANENT)
2785 continue;
2786
2787 spin_lock(&ifp->lock);
2788 age = (now - ifp->tstamp) / HZ;
2789
2790 #ifdef CONFIG_IPV6_PRIVACY
2791 regen_advance = ifp->idev->cnf.regen_max_retry *
2792 ifp->idev->cnf.dad_transmits *
2793 ifp->idev->nd_parms->retrans_time / HZ;
2794 #endif
2795
2796 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
2797 age >= ifp->valid_lft) {
2798 spin_unlock(&ifp->lock);
2799 in6_ifa_hold(ifp);
2800 read_unlock(&addrconf_hash_lock);
2801 ipv6_del_addr(ifp);
2802 goto restart;
2803 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
2804 spin_unlock(&ifp->lock);
2805 continue;
2806 } else if (age >= ifp->prefered_lft) {
2807 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
2808 int deprecate = 0;
2809
2810 if (!(ifp->flags&IFA_F_DEPRECATED)) {
2811 deprecate = 1;
2812 ifp->flags |= IFA_F_DEPRECATED;
2813 }
2814
2815 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
2816 next = ifp->tstamp + ifp->valid_lft * HZ;
2817
2818 spin_unlock(&ifp->lock);
2819
2820 if (deprecate) {
2821 in6_ifa_hold(ifp);
2822 read_unlock(&addrconf_hash_lock);
2823
2824 ipv6_ifa_notify(0, ifp);
2825 in6_ifa_put(ifp);
2826 goto restart;
2827 }
2828 #ifdef CONFIG_IPV6_PRIVACY
2829 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
2830 !(ifp->flags&IFA_F_TENTATIVE)) {
2831 if (age >= ifp->prefered_lft - regen_advance) {
2832 struct inet6_ifaddr *ifpub = ifp->ifpub;
2833 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2834 next = ifp->tstamp + ifp->prefered_lft * HZ;
2835 if (!ifp->regen_count && ifpub) {
2836 ifp->regen_count++;
2837 in6_ifa_hold(ifp);
2838 in6_ifa_hold(ifpub);
2839 spin_unlock(&ifp->lock);
2840 read_unlock(&addrconf_hash_lock);
2841 spin_lock(&ifpub->lock);
2842 ifpub->regen_count = 0;
2843 spin_unlock(&ifpub->lock);
2844 ipv6_create_tempaddr(ifpub, ifp);
2845 in6_ifa_put(ifpub);
2846 in6_ifa_put(ifp);
2847 goto restart;
2848 }
2849 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
2850 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
2851 spin_unlock(&ifp->lock);
2852 #endif
2853 } else {
2854 /* ifp->prefered_lft <= ifp->valid_lft */
2855 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2856 next = ifp->tstamp + ifp->prefered_lft * HZ;
2857 spin_unlock(&ifp->lock);
2858 }
2859 }
2860 read_unlock(&addrconf_hash_lock);
2861 }
2862
2863 addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
2864 add_timer(&addr_chk_timer);
2865 spin_unlock_bh(&addrconf_verify_lock);
2866 }
2867
2868 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
2869 {
2870 struct in6_addr *pfx = NULL;
2871
2872 if (addr)
2873 pfx = nla_data(addr);
2874
2875 if (local) {
2876 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
2877 pfx = NULL;
2878 else
2879 pfx = nla_data(local);
2880 }
2881
2882 return pfx;
2883 }
2884
2885 static struct nla_policy ifa_ipv6_policy[IFA_MAX+1] __read_mostly = {
2886 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
2887 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
2888 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
2889 };
2890
2891 static int
2892 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
2893 {
2894 struct ifaddrmsg *ifm;
2895 struct nlattr *tb[IFA_MAX+1];
2896 struct in6_addr *pfx;
2897 int err;
2898
2899 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
2900 if (err < 0)
2901 return err;
2902
2903 ifm = nlmsg_data(nlh);
2904 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
2905 if (pfx == NULL)
2906 return -EINVAL;
2907
2908 return inet6_addr_del(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
2909 }
2910
2911 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
2912 u32 prefered_lft, u32 valid_lft)
2913 {
2914 u32 flags = RTF_EXPIRES;
2915
2916 if (!valid_lft || (prefered_lft > valid_lft))
2917 return -EINVAL;
2918
2919 if (valid_lft == INFINITY_LIFE_TIME) {
2920 ifa_flags |= IFA_F_PERMANENT;
2921 flags = 0;
2922 } else if (valid_lft >= 0x7FFFFFFF/HZ)
2923 valid_lft = 0x7FFFFFFF/HZ;
2924
2925 if (prefered_lft == 0)
2926 ifa_flags |= IFA_F_DEPRECATED;
2927 else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
2928 (prefered_lft != INFINITY_LIFE_TIME))
2929 prefered_lft = 0x7FFFFFFF/HZ;
2930
2931 spin_lock_bh(&ifp->lock);
2932 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
2933 ifp->tstamp = jiffies;
2934 ifp->valid_lft = valid_lft;
2935 ifp->prefered_lft = prefered_lft;
2936
2937 spin_unlock_bh(&ifp->lock);
2938 if (!(ifp->flags&IFA_F_TENTATIVE))
2939 ipv6_ifa_notify(0, ifp);
2940
2941 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
2942 jiffies_to_clock_t(valid_lft * HZ), flags);
2943 addrconf_verify(0);
2944
2945 return 0;
2946 }
2947
2948 static int
2949 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
2950 {
2951 struct ifaddrmsg *ifm;
2952 struct nlattr *tb[IFA_MAX+1];
2953 struct in6_addr *pfx;
2954 struct inet6_ifaddr *ifa;
2955 struct net_device *dev;
2956 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
2957 u8 ifa_flags;
2958 int err;
2959
2960 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
2961 if (err < 0)
2962 return err;
2963
2964 ifm = nlmsg_data(nlh);
2965 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
2966 if (pfx == NULL)
2967 return -EINVAL;
2968
2969 if (tb[IFA_CACHEINFO]) {
2970 struct ifa_cacheinfo *ci;
2971
2972 ci = nla_data(tb[IFA_CACHEINFO]);
2973 valid_lft = ci->ifa_valid;
2974 preferred_lft = ci->ifa_prefered;
2975 } else {
2976 preferred_lft = INFINITY_LIFE_TIME;
2977 valid_lft = INFINITY_LIFE_TIME;
2978 }
2979
2980 dev = __dev_get_by_index(ifm->ifa_index);
2981 if (dev == NULL)
2982 return -ENODEV;
2983
2984 /* We ignore other flags so far. */
2985 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
2986
2987 ifa = ipv6_get_ifaddr(pfx, dev, 1);
2988 if (ifa == NULL) {
2989 /*
2990 * It would be best to check for !NLM_F_CREATE here but
2991 * userspace alreay relies on not having to provide this.
2992 */
2993 return inet6_addr_add(ifm->ifa_index, pfx, ifm->ifa_prefixlen,
2994 ifa_flags, preferred_lft, valid_lft);
2995 }
2996
2997 if (nlh->nlmsg_flags & NLM_F_EXCL ||
2998 !(nlh->nlmsg_flags & NLM_F_REPLACE))
2999 err = -EEXIST;
3000 else
3001 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3002
3003 in6_ifa_put(ifa);
3004
3005 return err;
3006 }
3007
3008 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3009 u8 scope, int ifindex)
3010 {
3011 struct ifaddrmsg *ifm;
3012
3013 ifm = nlmsg_data(nlh);
3014 ifm->ifa_family = AF_INET6;
3015 ifm->ifa_prefixlen = prefixlen;
3016 ifm->ifa_flags = flags;
3017 ifm->ifa_scope = scope;
3018 ifm->ifa_index = ifindex;
3019 }
3020
3021 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3022 unsigned long tstamp, u32 preferred, u32 valid)
3023 {
3024 struct ifa_cacheinfo ci;
3025
3026 ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3027 + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3028 ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3029 + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3030 ci.ifa_prefered = preferred;
3031 ci.ifa_valid = valid;
3032
3033 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3034 }
3035
3036 static inline int rt_scope(int ifa_scope)
3037 {
3038 if (ifa_scope & IFA_HOST)
3039 return RT_SCOPE_HOST;
3040 else if (ifa_scope & IFA_LINK)
3041 return RT_SCOPE_LINK;
3042 else if (ifa_scope & IFA_SITE)
3043 return RT_SCOPE_SITE;
3044 else
3045 return RT_SCOPE_UNIVERSE;
3046 }
3047
3048 static inline int inet6_ifaddr_msgsize(void)
3049 {
3050 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3051 + nla_total_size(16) /* IFA_ADDRESS */
3052 + nla_total_size(sizeof(struct ifa_cacheinfo));
3053 }
3054
3055 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3056 u32 pid, u32 seq, int event, unsigned int flags)
3057 {
3058 struct nlmsghdr *nlh;
3059 u32 preferred, valid;
3060
3061 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3062 if (nlh == NULL)
3063 return -EMSGSIZE;
3064
3065 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3066 ifa->idev->dev->ifindex);
3067
3068 if (!(ifa->flags&IFA_F_PERMANENT)) {
3069 preferred = ifa->prefered_lft;
3070 valid = ifa->valid_lft;
3071 if (preferred != INFINITY_LIFE_TIME) {
3072 long tval = (jiffies - ifa->tstamp)/HZ;
3073 preferred -= tval;
3074 if (valid != INFINITY_LIFE_TIME)
3075 valid -= tval;
3076 }
3077 } else {
3078 preferred = INFINITY_LIFE_TIME;
3079 valid = INFINITY_LIFE_TIME;
3080 }
3081
3082 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3083 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3084 nlmsg_cancel(skb, nlh);
3085 return -EMSGSIZE;
3086 }
3087
3088 return nlmsg_end(skb, nlh);
3089 }
3090
3091 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3092 u32 pid, u32 seq, int event, u16 flags)
3093 {
3094 struct nlmsghdr *nlh;
3095 u8 scope = RT_SCOPE_UNIVERSE;
3096 int ifindex = ifmca->idev->dev->ifindex;
3097
3098 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3099 scope = RT_SCOPE_SITE;
3100
3101 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3102 if (nlh == NULL)
3103 return -EMSGSIZE;
3104
3105 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3106 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3107 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3108 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3109 nlmsg_cancel(skb, nlh);
3110 return -EMSGSIZE;
3111 }
3112
3113 return nlmsg_end(skb, nlh);
3114 }
3115
3116 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3117 u32 pid, u32 seq, int event, unsigned int flags)
3118 {
3119 struct nlmsghdr *nlh;
3120 u8 scope = RT_SCOPE_UNIVERSE;
3121 int ifindex = ifaca->aca_idev->dev->ifindex;
3122
3123 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3124 scope = RT_SCOPE_SITE;
3125
3126 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3127 if (nlh == NULL)
3128 return -EMSGSIZE;
3129
3130 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3131 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3132 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3133 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3134 nlmsg_cancel(skb, nlh);
3135 return -EMSGSIZE;
3136 }
3137
3138 return nlmsg_end(skb, nlh);
3139 }
3140
3141 enum addr_type_t
3142 {
3143 UNICAST_ADDR,
3144 MULTICAST_ADDR,
3145 ANYCAST_ADDR,
3146 };
3147
3148 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3149 enum addr_type_t type)
3150 {
3151 int idx, ip_idx;
3152 int s_idx, s_ip_idx;
3153 int err = 1;
3154 struct net_device *dev;
3155 struct inet6_dev *idev = NULL;
3156 struct inet6_ifaddr *ifa;
3157 struct ifmcaddr6 *ifmca;
3158 struct ifacaddr6 *ifaca;
3159
3160 s_idx = cb->args[0];
3161 s_ip_idx = ip_idx = cb->args[1];
3162 read_lock(&dev_base_lock);
3163
3164 for (dev = dev_base, idx = 0; dev; dev = dev->next, idx++) {
3165 if (idx < s_idx)
3166 continue;
3167 if (idx > s_idx)
3168 s_ip_idx = 0;
3169 ip_idx = 0;
3170 if ((idev = in6_dev_get(dev)) == NULL)
3171 continue;
3172 read_lock_bh(&idev->lock);
3173 switch (type) {
3174 case UNICAST_ADDR:
3175 /* unicast address incl. temp addr */
3176 for (ifa = idev->addr_list; ifa;
3177 ifa = ifa->if_next, ip_idx++) {
3178 if (ip_idx < s_ip_idx)
3179 continue;
3180 if ((err = inet6_fill_ifaddr(skb, ifa,
3181 NETLINK_CB(cb->skb).pid,
3182 cb->nlh->nlmsg_seq, RTM_NEWADDR,
3183 NLM_F_MULTI)) <= 0)
3184 goto done;
3185 }
3186 break;
3187 case MULTICAST_ADDR:
3188 /* multicast address */
3189 for (ifmca = idev->mc_list; ifmca;
3190 ifmca = ifmca->next, ip_idx++) {
3191 if (ip_idx < s_ip_idx)
3192 continue;
3193 if ((err = inet6_fill_ifmcaddr(skb, ifmca,
3194 NETLINK_CB(cb->skb).pid,
3195 cb->nlh->nlmsg_seq, RTM_GETMULTICAST,
3196 NLM_F_MULTI)) <= 0)
3197 goto done;
3198 }
3199 break;
3200 case ANYCAST_ADDR:
3201 /* anycast address */
3202 for (ifaca = idev->ac_list; ifaca;
3203 ifaca = ifaca->aca_next, ip_idx++) {
3204 if (ip_idx < s_ip_idx)
3205 continue;
3206 if ((err = inet6_fill_ifacaddr(skb, ifaca,
3207 NETLINK_CB(cb->skb).pid,
3208 cb->nlh->nlmsg_seq, RTM_GETANYCAST,
3209 NLM_F_MULTI)) <= 0)
3210 goto done;
3211 }
3212 break;
3213 default:
3214 break;
3215 }
3216 read_unlock_bh(&idev->lock);
3217 in6_dev_put(idev);
3218 }
3219 done:
3220 if (err <= 0) {
3221 read_unlock_bh(&idev->lock);
3222 in6_dev_put(idev);
3223 }
3224 read_unlock(&dev_base_lock);
3225 cb->args[0] = idx;
3226 cb->args[1] = ip_idx;
3227 return skb->len;
3228 }
3229
3230 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3231 {
3232 enum addr_type_t type = UNICAST_ADDR;
3233 return inet6_dump_addr(skb, cb, type);
3234 }
3235
3236 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3237 {
3238 enum addr_type_t type = MULTICAST_ADDR;
3239 return inet6_dump_addr(skb, cb, type);
3240 }
3241
3242
3243 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3244 {
3245 enum addr_type_t type = ANYCAST_ADDR;
3246 return inet6_dump_addr(skb, cb, type);
3247 }
3248
3249 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3250 void *arg)
3251 {
3252 struct ifaddrmsg *ifm;
3253 struct nlattr *tb[IFA_MAX+1];
3254 struct in6_addr *addr = NULL;
3255 struct net_device *dev = NULL;
3256 struct inet6_ifaddr *ifa;
3257 struct sk_buff *skb;
3258 int err;
3259
3260 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3261 if (err < 0)
3262 goto errout;
3263
3264 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3265 if (addr == NULL) {
3266 err = -EINVAL;
3267 goto errout;
3268 }
3269
3270 ifm = nlmsg_data(nlh);
3271 if (ifm->ifa_index)
3272 dev = __dev_get_by_index(ifm->ifa_index);
3273
3274 if ((ifa = ipv6_get_ifaddr(addr, dev, 1)) == NULL) {
3275 err = -EADDRNOTAVAIL;
3276 goto errout;
3277 }
3278
3279 if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) {
3280 err = -ENOBUFS;
3281 goto errout_ifa;
3282 }
3283
3284 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3285 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3286 if (err < 0) {
3287 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3288 WARN_ON(err == -EMSGSIZE);
3289 kfree_skb(skb);
3290 goto errout_ifa;
3291 }
3292 err = rtnl_unicast(skb, NETLINK_CB(in_skb).pid);
3293 errout_ifa:
3294 in6_ifa_put(ifa);
3295 errout:
3296 return err;
3297 }
3298
3299 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3300 {
3301 struct sk_buff *skb;
3302 int err = -ENOBUFS;
3303
3304 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3305 if (skb == NULL)
3306 goto errout;
3307
3308 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3309 if (err < 0) {
3310 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3311 WARN_ON(err == -EMSGSIZE);
3312 kfree_skb(skb);
3313 goto errout;
3314 }
3315 err = rtnl_notify(skb, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3316 errout:
3317 if (err < 0)
3318 rtnl_set_sk_err(RTNLGRP_IPV6_IFADDR, err);
3319 }
3320
3321 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3322 __s32 *array, int bytes)
3323 {
3324 BUG_ON(bytes < (DEVCONF_MAX * 4));
3325
3326 memset(array, 0, bytes);
3327 array[DEVCONF_FORWARDING] = cnf->forwarding;
3328 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3329 array[DEVCONF_MTU6] = cnf->mtu6;
3330 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3331 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3332 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3333 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3334 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3335 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3336 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3337 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3338 #ifdef CONFIG_IPV6_PRIVACY
3339 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3340 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3341 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3342 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3343 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3344 #endif
3345 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3346 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3347 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3348 #ifdef CONFIG_IPV6_ROUTER_PREF
3349 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3350 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
3351 #ifdef CONFIG_IPV6_ROUTE_INFO
3352 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3353 #endif
3354 #endif
3355 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3356 }
3357
3358 static inline size_t inet6_if_nlmsg_size(void)
3359 {
3360 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3361 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3362 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3363 + nla_total_size(4) /* IFLA_MTU */
3364 + nla_total_size(4) /* IFLA_LINK */
3365 + nla_total_size( /* IFLA_PROTINFO */
3366 nla_total_size(4) /* IFLA_INET6_FLAGS */
3367 + nla_total_size(sizeof(struct ifla_cacheinfo))
3368 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3369 );
3370 }
3371
3372 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3373 u32 pid, u32 seq, int event, unsigned int flags)
3374 {
3375 struct net_device *dev = idev->dev;
3376 struct nlattr *conf;
3377 struct ifinfomsg *hdr;
3378 struct nlmsghdr *nlh;
3379 void *protoinfo;
3380 struct ifla_cacheinfo ci;
3381
3382 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3383 if (nlh == NULL)
3384 return -EMSGSIZE;
3385
3386 hdr = nlmsg_data(nlh);
3387 hdr->ifi_family = AF_INET6;
3388 hdr->__ifi_pad = 0;
3389 hdr->ifi_type = dev->type;
3390 hdr->ifi_index = dev->ifindex;
3391 hdr->ifi_flags = dev_get_flags(dev);
3392 hdr->ifi_change = 0;
3393
3394 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
3395
3396 if (dev->addr_len)
3397 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3398
3399 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
3400 if (dev->ifindex != dev->iflink)
3401 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
3402
3403 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3404 if (protoinfo == NULL)
3405 goto nla_put_failure;
3406
3407 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
3408
3409 ci.max_reasm_len = IPV6_MAXPLEN;
3410 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3411 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3412 ci.reachable_time = idev->nd_parms->reachable_time;
3413 ci.retrans_time = idev->nd_parms->retrans_time;
3414 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3415
3416 conf = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3417 if (conf == NULL)
3418 goto nla_put_failure;
3419 ipv6_store_devconf(&idev->cnf, nla_data(conf), nla_len(conf));
3420
3421 /* XXX - Statistics/MC not implemented */
3422
3423 nla_nest_end(skb, protoinfo);
3424 return nlmsg_end(skb, nlh);
3425
3426 nla_put_failure:
3427 nlmsg_cancel(skb, nlh);
3428 return -EMSGSIZE;
3429 }
3430
3431 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3432 {
3433 int idx, err;
3434 int s_idx = cb->args[0];
3435 struct net_device *dev;
3436 struct inet6_dev *idev;
3437
3438 read_lock(&dev_base_lock);
3439 for (dev=dev_base, idx=0; dev; dev = dev->next, idx++) {
3440 if (idx < s_idx)
3441 continue;
3442 if ((idev = in6_dev_get(dev)) == NULL)
3443 continue;
3444 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
3445 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
3446 in6_dev_put(idev);
3447 if (err <= 0)
3448 break;
3449 }
3450 read_unlock(&dev_base_lock);
3451 cb->args[0] = idx;
3452
3453 return skb->len;
3454 }
3455
3456 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3457 {
3458 struct sk_buff *skb;
3459 int err = -ENOBUFS;
3460
3461 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
3462 if (skb == NULL)
3463 goto errout;
3464
3465 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
3466 if (err < 0) {
3467 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3468 WARN_ON(err == -EMSGSIZE);
3469 kfree_skb(skb);
3470 goto errout;
3471 }
3472 err = rtnl_notify(skb, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3473 errout:
3474 if (err < 0)
3475 rtnl_set_sk_err(RTNLGRP_IPV6_IFADDR, err);
3476 }
3477
3478 static inline size_t inet6_prefix_nlmsg_size(void)
3479 {
3480 return NLMSG_ALIGN(sizeof(struct prefixmsg))
3481 + nla_total_size(sizeof(struct in6_addr))
3482 + nla_total_size(sizeof(struct prefix_cacheinfo));
3483 }
3484
3485 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
3486 struct prefix_info *pinfo, u32 pid, u32 seq,
3487 int event, unsigned int flags)
3488 {
3489 struct prefixmsg *pmsg;
3490 struct nlmsghdr *nlh;
3491 struct prefix_cacheinfo ci;
3492
3493 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
3494 if (nlh == NULL)
3495 return -EMSGSIZE;
3496
3497 pmsg = nlmsg_data(nlh);
3498 pmsg->prefix_family = AF_INET6;
3499 pmsg->prefix_pad1 = 0;
3500 pmsg->prefix_pad2 = 0;
3501 pmsg->prefix_ifindex = idev->dev->ifindex;
3502 pmsg->prefix_len = pinfo->prefix_len;
3503 pmsg->prefix_type = pinfo->type;
3504 pmsg->prefix_pad3 = 0;
3505 pmsg->prefix_flags = 0;
3506 if (pinfo->onlink)
3507 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3508 if (pinfo->autoconf)
3509 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3510
3511 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
3512
3513 ci.preferred_time = ntohl(pinfo->prefered);
3514 ci.valid_time = ntohl(pinfo->valid);
3515 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
3516
3517 return nlmsg_end(skb, nlh);
3518
3519 nla_put_failure:
3520 nlmsg_cancel(skb, nlh);
3521 return -EMSGSIZE;
3522 }
3523
3524 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
3525 struct prefix_info *pinfo)
3526 {
3527 struct sk_buff *skb;
3528 int err = -ENOBUFS;
3529
3530 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
3531 if (skb == NULL)
3532 goto errout;
3533
3534 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
3535 if (err < 0) {
3536 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
3537 WARN_ON(err == -EMSGSIZE);
3538 kfree_skb(skb);
3539 goto errout;
3540 }
3541 err = rtnl_notify(skb, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
3542 errout:
3543 if (err < 0)
3544 rtnl_set_sk_err(RTNLGRP_IPV6_PREFIX, err);
3545 }
3546
3547 static struct rtnetlink_link inet6_rtnetlink_table[RTM_NR_MSGTYPES] = {
3548 [RTM_GETLINK - RTM_BASE] = { .dumpit = inet6_dump_ifinfo, },
3549 [RTM_NEWADDR - RTM_BASE] = { .doit = inet6_rtm_newaddr, },
3550 [RTM_DELADDR - RTM_BASE] = { .doit = inet6_rtm_deladdr, },
3551 [RTM_GETADDR - RTM_BASE] = { .doit = inet6_rtm_getaddr,
3552 .dumpit = inet6_dump_ifaddr, },
3553 [RTM_GETMULTICAST - RTM_BASE] = { .dumpit = inet6_dump_ifmcaddr, },
3554 [RTM_GETANYCAST - RTM_BASE] = { .dumpit = inet6_dump_ifacaddr, },
3555 [RTM_NEWROUTE - RTM_BASE] = { .doit = inet6_rtm_newroute, },
3556 [RTM_DELROUTE - RTM_BASE] = { .doit = inet6_rtm_delroute, },
3557 [RTM_GETROUTE - RTM_BASE] = { .doit = inet6_rtm_getroute,
3558 .dumpit = inet6_dump_fib, },
3559 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3560 [RTM_GETRULE - RTM_BASE] = { .dumpit = fib6_rules_dump, },
3561 #endif
3562 };
3563
3564 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3565 {
3566 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3567
3568 switch (event) {
3569 case RTM_NEWADDR:
3570 ip6_ins_rt(ifp->rt);
3571 if (ifp->idev->cnf.forwarding)
3572 addrconf_join_anycast(ifp);
3573 break;
3574 case RTM_DELADDR:
3575 if (ifp->idev->cnf.forwarding)
3576 addrconf_leave_anycast(ifp);
3577 addrconf_leave_solict(ifp->idev, &ifp->addr);
3578 dst_hold(&ifp->rt->u.dst);
3579 if (ip6_del_rt(ifp->rt))
3580 dst_free(&ifp->rt->u.dst);
3581 break;
3582 }
3583 }
3584
3585 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3586 {
3587 rcu_read_lock_bh();
3588 if (likely(ifp->idev->dead == 0))
3589 __ipv6_ifa_notify(event, ifp);
3590 rcu_read_unlock_bh();
3591 }
3592
3593 #ifdef CONFIG_SYSCTL
3594
3595 static
3596 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3597 void __user *buffer, size_t *lenp, loff_t *ppos)
3598 {
3599 int *valp = ctl->data;
3600 int val = *valp;
3601 int ret;
3602
3603 ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3604
3605 if (write && valp != &ipv6_devconf_dflt.forwarding) {
3606 if (valp != &ipv6_devconf.forwarding) {
3607 if ((!*valp) ^ (!val)) {
3608 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
3609 if (idev == NULL)
3610 return ret;
3611 dev_forward_change(idev);
3612 }
3613 } else {
3614 ipv6_devconf_dflt.forwarding = ipv6_devconf.forwarding;
3615 addrconf_forward_change();
3616 }
3617 if (*valp)
3618 rt6_purge_dflt_routers();
3619 }
3620
3621 return ret;
3622 }
3623
3624 static int addrconf_sysctl_forward_strategy(ctl_table *table,
3625 int __user *name, int nlen,
3626 void __user *oldval,
3627 size_t __user *oldlenp,
3628 void __user *newval, size_t newlen)
3629 {
3630 int *valp = table->data;
3631 int new;
3632
3633 if (!newval || !newlen)
3634 return 0;
3635 if (newlen != sizeof(int))
3636 return -EINVAL;
3637 if (get_user(new, (int __user *)newval))
3638 return -EFAULT;
3639 if (new == *valp)
3640 return 0;
3641 if (oldval && oldlenp) {
3642 size_t len;
3643 if (get_user(len, oldlenp))
3644 return -EFAULT;
3645 if (len) {
3646 if (len > table->maxlen)
3647 len = table->maxlen;
3648 if (copy_to_user(oldval, valp, len))
3649 return -EFAULT;
3650 if (put_user(len, oldlenp))
3651 return -EFAULT;
3652 }
3653 }
3654
3655 if (valp != &ipv6_devconf_dflt.forwarding) {
3656 if (valp != &ipv6_devconf.forwarding) {
3657 struct inet6_dev *idev = (struct inet6_dev *)table->extra1;
3658 int changed;
3659 if (unlikely(idev == NULL))
3660 return -ENODEV;
3661 changed = (!*valp) ^ (!new);
3662 *valp = new;
3663 if (changed)
3664 dev_forward_change(idev);
3665 } else {
3666 *valp = new;
3667 addrconf_forward_change();
3668 }
3669
3670 if (*valp)
3671 rt6_purge_dflt_routers();
3672 } else
3673 *valp = new;
3674
3675 return 1;
3676 }
3677
3678 static struct addrconf_sysctl_table
3679 {
3680 struct ctl_table_header *sysctl_header;
3681 ctl_table addrconf_vars[__NET_IPV6_MAX];
3682 ctl_table addrconf_dev[2];
3683 ctl_table addrconf_conf_dir[2];
3684 ctl_table addrconf_proto_dir[2];
3685 ctl_table addrconf_root_dir[2];
3686 } addrconf_sysctl __read_mostly = {
3687 .sysctl_header = NULL,
3688 .addrconf_vars = {
3689 {
3690 .ctl_name = NET_IPV6_FORWARDING,
3691 .procname = "forwarding",
3692 .data = &ipv6_devconf.forwarding,
3693 .maxlen = sizeof(int),
3694 .mode = 0644,
3695 .proc_handler = &addrconf_sysctl_forward,
3696 .strategy = &addrconf_sysctl_forward_strategy,
3697 },
3698 {
3699 .ctl_name = NET_IPV6_HOP_LIMIT,
3700 .procname = "hop_limit",
3701 .data = &ipv6_devconf.hop_limit,
3702 .maxlen = sizeof(int),
3703 .mode = 0644,
3704 .proc_handler = proc_dointvec,
3705 },
3706 {
3707 .ctl_name = NET_IPV6_MTU,
3708 .procname = "mtu",
3709 .data = &ipv6_devconf.mtu6,
3710 .maxlen = sizeof(int),
3711 .mode = 0644,
3712 .proc_handler = &proc_dointvec,
3713 },
3714 {
3715 .ctl_name = NET_IPV6_ACCEPT_RA,
3716 .procname = "accept_ra",
3717 .data = &ipv6_devconf.accept_ra,
3718 .maxlen = sizeof(int),
3719 .mode = 0644,
3720 .proc_handler = &proc_dointvec,
3721 },
3722 {
3723 .ctl_name = NET_IPV6_ACCEPT_REDIRECTS,
3724 .procname = "accept_redirects",
3725 .data = &ipv6_devconf.accept_redirects,
3726 .maxlen = sizeof(int),
3727 .mode = 0644,
3728 .proc_handler = &proc_dointvec,
3729 },
3730 {
3731 .ctl_name = NET_IPV6_AUTOCONF,
3732 .procname = "autoconf",
3733 .data = &ipv6_devconf.autoconf,
3734 .maxlen = sizeof(int),
3735 .mode = 0644,
3736 .proc_handler = &proc_dointvec,
3737 },
3738 {
3739 .ctl_name = NET_IPV6_DAD_TRANSMITS,
3740 .procname = "dad_transmits",
3741 .data = &ipv6_devconf.dad_transmits,
3742 .maxlen = sizeof(int),
3743 .mode = 0644,
3744 .proc_handler = &proc_dointvec,
3745 },
3746 {
3747 .ctl_name = NET_IPV6_RTR_SOLICITS,
3748 .procname = "router_solicitations",
3749 .data = &ipv6_devconf.rtr_solicits,
3750 .maxlen = sizeof(int),
3751 .mode = 0644,
3752 .proc_handler = &proc_dointvec,
3753 },
3754 {
3755 .ctl_name = NET_IPV6_RTR_SOLICIT_INTERVAL,
3756 .procname = "router_solicitation_interval",
3757 .data = &ipv6_devconf.rtr_solicit_interval,
3758 .maxlen = sizeof(int),
3759 .mode = 0644,
3760 .proc_handler = &proc_dointvec_jiffies,
3761 .strategy = &sysctl_jiffies,
3762 },
3763 {
3764 .ctl_name = NET_IPV6_RTR_SOLICIT_DELAY,
3765 .procname = "router_solicitation_delay",
3766 .data = &ipv6_devconf.rtr_solicit_delay,
3767 .maxlen = sizeof(int),
3768 .mode = 0644,
3769 .proc_handler = &proc_dointvec_jiffies,
3770 .strategy = &sysctl_jiffies,
3771 },
3772 {
3773 .ctl_name = NET_IPV6_FORCE_MLD_VERSION,
3774 .procname = "force_mld_version",
3775 .data = &ipv6_devconf.force_mld_version,
3776 .maxlen = sizeof(int),
3777 .mode = 0644,
3778 .proc_handler = &proc_dointvec,
3779 },
3780 #ifdef CONFIG_IPV6_PRIVACY
3781 {
3782 .ctl_name = NET_IPV6_USE_TEMPADDR,
3783 .procname = "use_tempaddr",
3784 .data = &ipv6_devconf.use_tempaddr,
3785 .maxlen = sizeof(int),
3786 .mode = 0644,
3787 .proc_handler = &proc_dointvec,
3788 },
3789 {
3790 .ctl_name = NET_IPV6_TEMP_VALID_LFT,
3791 .procname = "temp_valid_lft",
3792 .data = &ipv6_devconf.temp_valid_lft,
3793 .maxlen = sizeof(int),
3794 .mode = 0644,
3795 .proc_handler = &proc_dointvec,
3796 },
3797 {
3798 .ctl_name = NET_IPV6_TEMP_PREFERED_LFT,
3799 .procname = "temp_prefered_lft",
3800 .data = &ipv6_devconf.temp_prefered_lft,
3801 .maxlen = sizeof(int),
3802 .mode = 0644,
3803 .proc_handler = &proc_dointvec,
3804 },
3805 {
3806 .ctl_name = NET_IPV6_REGEN_MAX_RETRY,
3807 .procname = "regen_max_retry",
3808 .data = &ipv6_devconf.regen_max_retry,
3809 .maxlen = sizeof(int),
3810 .mode = 0644,
3811 .proc_handler = &proc_dointvec,
3812 },
3813 {
3814 .ctl_name = NET_IPV6_MAX_DESYNC_FACTOR,
3815 .procname = "max_desync_factor",
3816 .data = &ipv6_devconf.max_desync_factor,
3817 .maxlen = sizeof(int),
3818 .mode = 0644,
3819 .proc_handler = &proc_dointvec,
3820 },
3821 #endif
3822 {
3823 .ctl_name = NET_IPV6_MAX_ADDRESSES,
3824 .procname = "max_addresses",
3825 .data = &ipv6_devconf.max_addresses,
3826 .maxlen = sizeof(int),
3827 .mode = 0644,
3828 .proc_handler = &proc_dointvec,
3829 },
3830 {
3831 .ctl_name = NET_IPV6_ACCEPT_RA_DEFRTR,
3832 .procname = "accept_ra_defrtr",
3833 .data = &ipv6_devconf.accept_ra_defrtr,
3834 .maxlen = sizeof(int),
3835 .mode = 0644,
3836 .proc_handler = &proc_dointvec,
3837 },
3838 {
3839 .ctl_name = NET_IPV6_ACCEPT_RA_PINFO,
3840 .procname = "accept_ra_pinfo",
3841 .data = &ipv6_devconf.accept_ra_pinfo,
3842 .maxlen = sizeof(int),
3843 .mode = 0644,
3844 .proc_handler = &proc_dointvec,
3845 },
3846 #ifdef CONFIG_IPV6_ROUTER_PREF
3847 {
3848 .ctl_name = NET_IPV6_ACCEPT_RA_RTR_PREF,
3849 .procname = "accept_ra_rtr_pref",
3850 .data = &ipv6_devconf.accept_ra_rtr_pref,
3851 .maxlen = sizeof(int),
3852 .mode = 0644,
3853 .proc_handler = &proc_dointvec,
3854 },
3855 {
3856 .ctl_name = NET_IPV6_RTR_PROBE_INTERVAL,
3857 .procname = "router_probe_interval",
3858 .data = &ipv6_devconf.rtr_probe_interval,
3859 .maxlen = sizeof(int),
3860 .mode = 0644,
3861 .proc_handler = &proc_dointvec_jiffies,
3862 .strategy = &sysctl_jiffies,
3863 },
3864 #ifdef CONFIG_IPV6_ROUTE_INFO
3865 {
3866 .ctl_name = NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN,
3867 .procname = "accept_ra_rt_info_max_plen",
3868 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
3869 .maxlen = sizeof(int),
3870 .mode = 0644,
3871 .proc_handler = &proc_dointvec,
3872 },
3873 #endif
3874 #endif
3875 {
3876 .ctl_name = NET_IPV6_PROXY_NDP,
3877 .procname = "proxy_ndp",
3878 .data = &ipv6_devconf.proxy_ndp,
3879 .maxlen = sizeof(int),
3880 .mode = 0644,
3881 .proc_handler = &proc_dointvec,
3882 },
3883 {
3884 .ctl_name = 0, /* sentinel */
3885 }
3886 },
3887 .addrconf_dev = {
3888 {
3889 .ctl_name = NET_PROTO_CONF_ALL,
3890 .procname = "all",
3891 .mode = 0555,
3892 .child = addrconf_sysctl.addrconf_vars,
3893 },
3894 {
3895 .ctl_name = 0, /* sentinel */
3896 }
3897 },
3898 .addrconf_conf_dir = {
3899 {
3900 .ctl_name = NET_IPV6_CONF,
3901 .procname = "conf",
3902 .mode = 0555,
3903 .child = addrconf_sysctl.addrconf_dev,
3904 },
3905 {
3906 .ctl_name = 0, /* sentinel */
3907 }
3908 },
3909 .addrconf_proto_dir = {
3910 {
3911 .ctl_name = NET_IPV6,
3912 .procname = "ipv6",
3913 .mode = 0555,
3914 .child = addrconf_sysctl.addrconf_conf_dir,
3915 },
3916 {
3917 .ctl_name = 0, /* sentinel */
3918 }
3919 },
3920 .addrconf_root_dir = {
3921 {
3922 .ctl_name = CTL_NET,
3923 .procname = "net",
3924 .mode = 0555,
3925 .child = addrconf_sysctl.addrconf_proto_dir,
3926 },
3927 {
3928 .ctl_name = 0, /* sentinel */
3929 }
3930 },
3931 };
3932
3933 static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p)
3934 {
3935 int i;
3936 struct net_device *dev = idev ? idev->dev : NULL;
3937 struct addrconf_sysctl_table *t;
3938 char *dev_name = NULL;
3939
3940 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
3941 if (t == NULL)
3942 return;
3943 for (i=0; t->addrconf_vars[i].data; i++) {
3944 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
3945 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
3946 }
3947 if (dev) {
3948 dev_name = dev->name;
3949 t->addrconf_dev[0].ctl_name = dev->ifindex;
3950 } else {
3951 dev_name = "default";
3952 t->addrconf_dev[0].ctl_name = NET_PROTO_CONF_DEFAULT;
3953 }
3954
3955 /*
3956 * Make a copy of dev_name, because '.procname' is regarded as const
3957 * by sysctl and we wouldn't want anyone to change it under our feet
3958 * (see SIOCSIFNAME).
3959 */
3960 dev_name = kstrdup(dev_name, GFP_KERNEL);
3961 if (!dev_name)
3962 goto free;
3963
3964 t->addrconf_dev[0].procname = dev_name;
3965
3966 t->addrconf_dev[0].child = t->addrconf_vars;
3967 t->addrconf_conf_dir[0].child = t->addrconf_dev;
3968 t->addrconf_proto_dir[0].child = t->addrconf_conf_dir;
3969 t->addrconf_root_dir[0].child = t->addrconf_proto_dir;
3970
3971 t->sysctl_header = register_sysctl_table(t->addrconf_root_dir);
3972 if (t->sysctl_header == NULL)
3973 goto free_procname;
3974 else
3975 p->sysctl = t;
3976 return;
3977
3978 /* error path */
3979 free_procname:
3980 kfree(dev_name);
3981 free:
3982 kfree(t);
3983
3984 return;
3985 }
3986
3987 static void addrconf_sysctl_unregister(struct ipv6_devconf *p)
3988 {
3989 if (p->sysctl) {
3990 struct addrconf_sysctl_table *t = p->sysctl;
3991 p->sysctl = NULL;
3992 unregister_sysctl_table(t->sysctl_header);
3993 kfree(t->addrconf_dev[0].procname);
3994 kfree(t);
3995 }
3996 }
3997
3998
3999 #endif
4000
4001 /*
4002 * Device notifier
4003 */
4004
4005 int register_inet6addr_notifier(struct notifier_block *nb)
4006 {
4007 return atomic_notifier_chain_register(&inet6addr_chain, nb);
4008 }
4009
4010 int unregister_inet6addr_notifier(struct notifier_block *nb)
4011 {
4012 return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
4013 }
4014
4015 /*
4016 * Init / cleanup code
4017 */
4018
4019 int __init addrconf_init(void)
4020 {
4021 int err = 0;
4022
4023 /* The addrconf netdev notifier requires that loopback_dev
4024 * has it's ipv6 private information allocated and setup
4025 * before it can bring up and give link-local addresses
4026 * to other devices which are up.
4027 *
4028 * Unfortunately, loopback_dev is not necessarily the first
4029 * entry in the global dev_base list of net devices. In fact,
4030 * it is likely to be the very last entry on that list.
4031 * So this causes the notifier registry below to try and
4032 * give link-local addresses to all devices besides loopback_dev
4033 * first, then loopback_dev, which cases all the non-loopback_dev
4034 * devices to fail to get a link-local address.
4035 *
4036 * So, as a temporary fix, allocate the ipv6 structure for
4037 * loopback_dev first by hand.
4038 * Longer term, all of the dependencies ipv6 has upon the loopback
4039 * device and it being up should be removed.
4040 */
4041 rtnl_lock();
4042 if (!ipv6_add_dev(&loopback_dev))
4043 err = -ENOMEM;
4044 rtnl_unlock();
4045 if (err)
4046 return err;
4047
4048 ip6_null_entry.rt6i_idev = in6_dev_get(&loopback_dev);
4049
4050 register_netdevice_notifier(&ipv6_dev_notf);
4051
4052 addrconf_verify(0);
4053 rtnetlink_links[PF_INET6] = inet6_rtnetlink_table;
4054 #ifdef CONFIG_SYSCTL
4055 addrconf_sysctl.sysctl_header =
4056 register_sysctl_table(addrconf_sysctl.addrconf_root_dir);
4057 addrconf_sysctl_register(NULL, &ipv6_devconf_dflt);
4058 #endif
4059
4060 return 0;
4061 }
4062
4063 void __exit addrconf_cleanup(void)
4064 {
4065 struct net_device *dev;
4066 struct inet6_dev *idev;
4067 struct inet6_ifaddr *ifa;
4068 int i;
4069
4070 unregister_netdevice_notifier(&ipv6_dev_notf);
4071
4072 rtnetlink_links[PF_INET6] = NULL;
4073 #ifdef CONFIG_SYSCTL
4074 addrconf_sysctl_unregister(&ipv6_devconf_dflt);
4075 addrconf_sysctl_unregister(&ipv6_devconf);
4076 #endif
4077
4078 rtnl_lock();
4079
4080 /*
4081 * clean dev list.
4082 */
4083
4084 for (dev=dev_base; dev; dev=dev->next) {
4085 if ((idev = __in6_dev_get(dev)) == NULL)
4086 continue;
4087 addrconf_ifdown(dev, 1);
4088 }
4089 addrconf_ifdown(&loopback_dev, 2);
4090
4091 /*
4092 * Check hash table.
4093 */
4094
4095 write_lock_bh(&addrconf_hash_lock);
4096 for (i=0; i < IN6_ADDR_HSIZE; i++) {
4097 for (ifa=inet6_addr_lst[i]; ifa; ) {
4098 struct inet6_ifaddr *bifa;
4099
4100 bifa = ifa;
4101 ifa = ifa->lst_next;
4102 printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
4103 /* Do not free it; something is wrong.
4104 Now we can investigate it with debugger.
4105 */
4106 }
4107 }
4108 write_unlock_bh(&addrconf_hash_lock);
4109
4110 del_timer(&addr_chk_timer);
4111
4112 rtnl_unlock();
4113
4114 #ifdef CONFIG_PROC_FS
4115 proc_net_remove("if_inet6");
4116 #endif
4117 }
linux v2.6.22.y-op