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[IPV6]: Use ctl paths to register addrconf sysctls
[mirror_ubuntu-bionic-kernel.git] / net / ipv6 / addrconf.c
1 /*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
9 * $Id: addrconf.c,v 1.69 2001/10/31 21:55:54 davem Exp $
10 *
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License
13 * as published by the Free Software Foundation; either version
14 * 2 of the License, or (at your option) any later version.
15 */
16
17 /*
18 * Changes:
19 *
20 * Janos Farkas : delete timer on ifdown
21 * <chexum@bankinf.banki.hu>
22 * Andi Kleen : kill double kfree on module
23 * unload.
24 * Maciej W. Rozycki : FDDI support
25 * sekiya@USAGI : Don't send too many RS
26 * packets.
27 * yoshfuji@USAGI : Fixed interval between DAD
28 * packets.
29 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
30 * address validation timer.
31 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
32 * support.
33 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
34 * address on a same interface.
35 * YOSHIFUJI Hideaki @USAGI : ARCnet support
36 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
37 * seq_file.
38 * YOSHIFUJI Hideaki @USAGI : improved source address
39 * selection; consider scope,
40 * status etc.
41 */
42
43 #include <linux/errno.h>
44 #include <linux/types.h>
45 #include <linux/socket.h>
46 #include <linux/sockios.h>
47 #include <linux/net.h>
48 #include <linux/in6.h>
49 #include <linux/netdevice.h>
50 #include <linux/if_addr.h>
51 #include <linux/if_arp.h>
52 #include <linux/if_arcnet.h>
53 #include <linux/if_infiniband.h>
54 #include <linux/route.h>
55 #include <linux/inetdevice.h>
56 #include <linux/init.h>
57 #ifdef CONFIG_SYSCTL
58 #include <linux/sysctl.h>
59 #endif
60 #include <linux/capability.h>
61 #include <linux/delay.h>
62 #include <linux/notifier.h>
63 #include <linux/string.h>
64
65 #include <net/net_namespace.h>
66 #include <net/sock.h>
67 #include <net/snmp.h>
68
69 #include <net/ipv6.h>
70 #include <net/protocol.h>
71 #include <net/ndisc.h>
72 #include <net/ip6_route.h>
73 #include <net/addrconf.h>
74 #include <net/tcp.h>
75 #include <net/ip.h>
76 #include <net/netlink.h>
77 #include <net/pkt_sched.h>
78 #include <linux/if_tunnel.h>
79 #include <linux/rtnetlink.h>
80
81 #ifdef CONFIG_IPV6_PRIVACY
82 #include <linux/random.h>
83 #endif
84
85 #include <asm/uaccess.h>
86 #include <asm/unaligned.h>
87
88 #include <linux/proc_fs.h>
89 #include <linux/seq_file.h>
90
91 /* Set to 3 to get tracing... */
92 #define ACONF_DEBUG 2
93
94 #if ACONF_DEBUG >= 3
95 #define ADBG(x) printk x
96 #else
97 #define ADBG(x)
98 #endif
99
100 #define INFINITY_LIFE_TIME 0xFFFFFFFF
101 #define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b)))
102
103 #ifdef CONFIG_SYSCTL
104 static void addrconf_sysctl_register(struct inet6_dev *idev);
105 static void addrconf_sysctl_unregister(struct ipv6_devconf *p);
106 #endif
107
108 #ifdef CONFIG_IPV6_PRIVACY
109 static int __ipv6_regen_rndid(struct inet6_dev *idev);
110 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
111 static void ipv6_regen_rndid(unsigned long data);
112
113 static int desync_factor = MAX_DESYNC_FACTOR * HZ;
114 #endif
115
116 static int ipv6_count_addresses(struct inet6_dev *idev);
117
118 /*
119 * Configured unicast address hash table
120 */
121 static struct inet6_ifaddr *inet6_addr_lst[IN6_ADDR_HSIZE];
122 static DEFINE_RWLOCK(addrconf_hash_lock);
123
124 static void addrconf_verify(unsigned long);
125
126 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
127 static DEFINE_SPINLOCK(addrconf_verify_lock);
128
129 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
130 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
131
132 static int addrconf_ifdown(struct net_device *dev, int how);
133
134 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
135 static void addrconf_dad_timer(unsigned long data);
136 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
137 static void addrconf_dad_run(struct inet6_dev *idev);
138 static void addrconf_rs_timer(unsigned long data);
139 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
140 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
141
142 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
143 struct prefix_info *pinfo);
144 static int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev);
145
146 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
147
148 struct ipv6_devconf ipv6_devconf __read_mostly = {
149 .forwarding = 0,
150 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
151 .mtu6 = IPV6_MIN_MTU,
152 .accept_ra = 1,
153 .accept_redirects = 1,
154 .autoconf = 1,
155 .force_mld_version = 0,
156 .dad_transmits = 1,
157 .rtr_solicits = MAX_RTR_SOLICITATIONS,
158 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
159 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
160 #ifdef CONFIG_IPV6_PRIVACY
161 .use_tempaddr = 0,
162 .temp_valid_lft = TEMP_VALID_LIFETIME,
163 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
164 .regen_max_retry = REGEN_MAX_RETRY,
165 .max_desync_factor = MAX_DESYNC_FACTOR,
166 #endif
167 .max_addresses = IPV6_MAX_ADDRESSES,
168 .accept_ra_defrtr = 1,
169 .accept_ra_pinfo = 1,
170 #ifdef CONFIG_IPV6_ROUTER_PREF
171 .accept_ra_rtr_pref = 1,
172 .rtr_probe_interval = 60 * HZ,
173 #ifdef CONFIG_IPV6_ROUTE_INFO
174 .accept_ra_rt_info_max_plen = 0,
175 #endif
176 #endif
177 .proxy_ndp = 0,
178 .accept_source_route = 0, /* we do not accept RH0 by default. */
179 };
180
181 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
182 .forwarding = 0,
183 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
184 .mtu6 = IPV6_MIN_MTU,
185 .accept_ra = 1,
186 .accept_redirects = 1,
187 .autoconf = 1,
188 .dad_transmits = 1,
189 .rtr_solicits = MAX_RTR_SOLICITATIONS,
190 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
191 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
192 #ifdef CONFIG_IPV6_PRIVACY
193 .use_tempaddr = 0,
194 .temp_valid_lft = TEMP_VALID_LIFETIME,
195 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
196 .regen_max_retry = REGEN_MAX_RETRY,
197 .max_desync_factor = MAX_DESYNC_FACTOR,
198 #endif
199 .max_addresses = IPV6_MAX_ADDRESSES,
200 .accept_ra_defrtr = 1,
201 .accept_ra_pinfo = 1,
202 #ifdef CONFIG_IPV6_ROUTER_PREF
203 .accept_ra_rtr_pref = 1,
204 .rtr_probe_interval = 60 * HZ,
205 #ifdef CONFIG_IPV6_ROUTE_INFO
206 .accept_ra_rt_info_max_plen = 0,
207 #endif
208 #endif
209 .proxy_ndp = 0,
210 .accept_source_route = 0, /* we do not accept RH0 by default. */
211 };
212
213 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
214 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
215 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
216
217 /* Check if a valid qdisc is available */
218 static inline int addrconf_qdisc_ok(struct net_device *dev)
219 {
220 return (dev->qdisc != &noop_qdisc);
221 }
222
223 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
224 {
225 if (del_timer(&ifp->timer))
226 __in6_ifa_put(ifp);
227 }
228
229 enum addrconf_timer_t
230 {
231 AC_NONE,
232 AC_DAD,
233 AC_RS,
234 };
235
236 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
237 enum addrconf_timer_t what,
238 unsigned long when)
239 {
240 if (!del_timer(&ifp->timer))
241 in6_ifa_hold(ifp);
242
243 switch (what) {
244 case AC_DAD:
245 ifp->timer.function = addrconf_dad_timer;
246 break;
247 case AC_RS:
248 ifp->timer.function = addrconf_rs_timer;
249 break;
250 default:;
251 }
252 ifp->timer.expires = jiffies + when;
253 add_timer(&ifp->timer);
254 }
255
256 static int snmp6_alloc_dev(struct inet6_dev *idev)
257 {
258 if (snmp_mib_init((void **)idev->stats.ipv6,
259 sizeof(struct ipstats_mib),
260 __alignof__(struct ipstats_mib)) < 0)
261 goto err_ip;
262 if (snmp_mib_init((void **)idev->stats.icmpv6,
263 sizeof(struct icmpv6_mib),
264 __alignof__(struct icmpv6_mib)) < 0)
265 goto err_icmp;
266 if (snmp_mib_init((void **)idev->stats.icmpv6msg,
267 sizeof(struct icmpv6msg_mib),
268 __alignof__(struct icmpv6msg_mib)) < 0)
269 goto err_icmpmsg;
270
271 return 0;
272
273 err_icmpmsg:
274 snmp_mib_free((void **)idev->stats.icmpv6);
275 err_icmp:
276 snmp_mib_free((void **)idev->stats.ipv6);
277 err_ip:
278 return -ENOMEM;
279 }
280
281 static void snmp6_free_dev(struct inet6_dev *idev)
282 {
283 snmp_mib_free((void **)idev->stats.icmpv6msg);
284 snmp_mib_free((void **)idev->stats.icmpv6);
285 snmp_mib_free((void **)idev->stats.ipv6);
286 }
287
288 /* Nobody refers to this device, we may destroy it. */
289
290 static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
291 {
292 struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
293 kfree(idev);
294 }
295
296 void in6_dev_finish_destroy(struct inet6_dev *idev)
297 {
298 struct net_device *dev = idev->dev;
299 BUG_TRAP(idev->addr_list==NULL);
300 BUG_TRAP(idev->mc_list==NULL);
301 #ifdef NET_REFCNT_DEBUG
302 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
303 #endif
304 dev_put(dev);
305 if (!idev->dead) {
306 printk("Freeing alive inet6 device %p\n", idev);
307 return;
308 }
309 snmp6_free_dev(idev);
310 call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
311 }
312
313 EXPORT_SYMBOL(in6_dev_finish_destroy);
314
315 static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
316 {
317 struct inet6_dev *ndev;
318 struct in6_addr maddr;
319
320 ASSERT_RTNL();
321
322 if (dev->mtu < IPV6_MIN_MTU)
323 return NULL;
324
325 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
326
327 if (ndev == NULL)
328 return NULL;
329
330 rwlock_init(&ndev->lock);
331 ndev->dev = dev;
332 memcpy(&ndev->cnf, &ipv6_devconf_dflt, sizeof(ndev->cnf));
333 ndev->cnf.mtu6 = dev->mtu;
334 ndev->cnf.sysctl = NULL;
335 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
336 if (ndev->nd_parms == NULL) {
337 kfree(ndev);
338 return NULL;
339 }
340 /* We refer to the device */
341 dev_hold(dev);
342
343 if (snmp6_alloc_dev(ndev) < 0) {
344 ADBG((KERN_WARNING
345 "%s(): cannot allocate memory for statistics; dev=%s.\n",
346 __FUNCTION__, dev->name));
347 neigh_parms_release(&nd_tbl, ndev->nd_parms);
348 ndev->dead = 1;
349 in6_dev_finish_destroy(ndev);
350 return NULL;
351 }
352
353 if (snmp6_register_dev(ndev) < 0) {
354 ADBG((KERN_WARNING
355 "%s(): cannot create /proc/net/dev_snmp6/%s\n",
356 __FUNCTION__, dev->name));
357 neigh_parms_release(&nd_tbl, ndev->nd_parms);
358 ndev->dead = 1;
359 in6_dev_finish_destroy(ndev);
360 return NULL;
361 }
362
363 /* One reference from device. We must do this before
364 * we invoke __ipv6_regen_rndid().
365 */
366 in6_dev_hold(ndev);
367
368 #ifdef CONFIG_IPV6_PRIVACY
369 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
370 if ((dev->flags&IFF_LOOPBACK) ||
371 dev->type == ARPHRD_TUNNEL ||
372 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
373 dev->type == ARPHRD_SIT ||
374 #endif
375 dev->type == ARPHRD_NONE) {
376 printk(KERN_INFO
377 "%s: Disabled Privacy Extensions\n",
378 dev->name);
379 ndev->cnf.use_tempaddr = -1;
380
381 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
382 printk(KERN_INFO
383 "%s: Disabled Multicast RS\n",
384 dev->name);
385 ndev->cnf.rtr_solicits = 0;
386 }
387 } else {
388 in6_dev_hold(ndev);
389 ipv6_regen_rndid((unsigned long) ndev);
390 }
391 #endif
392
393 if (netif_running(dev) && addrconf_qdisc_ok(dev))
394 ndev->if_flags |= IF_READY;
395
396 ipv6_mc_init_dev(ndev);
397 ndev->tstamp = jiffies;
398 #ifdef CONFIG_SYSCTL
399 neigh_sysctl_register(dev, ndev->nd_parms, NET_IPV6,
400 NET_IPV6_NEIGH, "ipv6",
401 &ndisc_ifinfo_sysctl_change,
402 NULL);
403 addrconf_sysctl_register(ndev);
404 #endif
405 /* protected by rtnl_lock */
406 rcu_assign_pointer(dev->ip6_ptr, ndev);
407
408 /* Join all-node multicast group */
409 ipv6_addr_all_nodes(&maddr);
410 ipv6_dev_mc_inc(dev, &maddr);
411
412 return ndev;
413 }
414
415 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
416 {
417 struct inet6_dev *idev;
418
419 ASSERT_RTNL();
420
421 if ((idev = __in6_dev_get(dev)) == NULL) {
422 if ((idev = ipv6_add_dev(dev)) == NULL)
423 return NULL;
424 }
425
426 if (dev->flags&IFF_UP)
427 ipv6_mc_up(idev);
428 return idev;
429 }
430
431 #ifdef CONFIG_SYSCTL
432 static void dev_forward_change(struct inet6_dev *idev)
433 {
434 struct net_device *dev;
435 struct inet6_ifaddr *ifa;
436 struct in6_addr addr;
437
438 if (!idev)
439 return;
440 dev = idev->dev;
441 if (dev && (dev->flags & IFF_MULTICAST)) {
442 ipv6_addr_all_routers(&addr);
443
444 if (idev->cnf.forwarding)
445 ipv6_dev_mc_inc(dev, &addr);
446 else
447 ipv6_dev_mc_dec(dev, &addr);
448 }
449 for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
450 if (ifa->flags&IFA_F_TENTATIVE)
451 continue;
452 if (idev->cnf.forwarding)
453 addrconf_join_anycast(ifa);
454 else
455 addrconf_leave_anycast(ifa);
456 }
457 }
458
459
460 static void addrconf_forward_change(void)
461 {
462 struct net_device *dev;
463 struct inet6_dev *idev;
464
465 read_lock(&dev_base_lock);
466 for_each_netdev(&init_net, dev) {
467 rcu_read_lock();
468 idev = __in6_dev_get(dev);
469 if (idev) {
470 int changed = (!idev->cnf.forwarding) ^ (!ipv6_devconf.forwarding);
471 idev->cnf.forwarding = ipv6_devconf.forwarding;
472 if (changed)
473 dev_forward_change(idev);
474 }
475 rcu_read_unlock();
476 }
477 read_unlock(&dev_base_lock);
478 }
479 #endif
480
481 /* Nobody refers to this ifaddr, destroy it */
482
483 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
484 {
485 BUG_TRAP(ifp->if_next==NULL);
486 BUG_TRAP(ifp->lst_next==NULL);
487 #ifdef NET_REFCNT_DEBUG
488 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
489 #endif
490
491 in6_dev_put(ifp->idev);
492
493 if (del_timer(&ifp->timer))
494 printk("Timer is still running, when freeing ifa=%p\n", ifp);
495
496 if (!ifp->dead) {
497 printk("Freeing alive inet6 address %p\n", ifp);
498 return;
499 }
500 dst_release(&ifp->rt->u.dst);
501
502 kfree(ifp);
503 }
504
505 static void
506 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
507 {
508 struct inet6_ifaddr *ifa, **ifap;
509 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
510
511 /*
512 * Each device address list is sorted in order of scope -
513 * global before linklocal.
514 */
515 for (ifap = &idev->addr_list; (ifa = *ifap) != NULL;
516 ifap = &ifa->if_next) {
517 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
518 break;
519 }
520
521 ifp->if_next = *ifap;
522 *ifap = ifp;
523 }
524
525 /* On success it returns ifp with increased reference count */
526
527 static struct inet6_ifaddr *
528 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
529 int scope, u32 flags)
530 {
531 struct inet6_ifaddr *ifa = NULL;
532 struct rt6_info *rt;
533 int hash;
534 int err = 0;
535
536 rcu_read_lock_bh();
537 if (idev->dead) {
538 err = -ENODEV; /*XXX*/
539 goto out2;
540 }
541
542 write_lock(&addrconf_hash_lock);
543
544 /* Ignore adding duplicate addresses on an interface */
545 if (ipv6_chk_same_addr(addr, idev->dev)) {
546 ADBG(("ipv6_add_addr: already assigned\n"));
547 err = -EEXIST;
548 goto out;
549 }
550
551 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
552
553 if (ifa == NULL) {
554 ADBG(("ipv6_add_addr: malloc failed\n"));
555 err = -ENOBUFS;
556 goto out;
557 }
558
559 rt = addrconf_dst_alloc(idev, addr, 0);
560 if (IS_ERR(rt)) {
561 err = PTR_ERR(rt);
562 goto out;
563 }
564
565 ipv6_addr_copy(&ifa->addr, addr);
566
567 spin_lock_init(&ifa->lock);
568 init_timer(&ifa->timer);
569 ifa->timer.data = (unsigned long) ifa;
570 ifa->scope = scope;
571 ifa->prefix_len = pfxlen;
572 ifa->flags = flags | IFA_F_TENTATIVE;
573 ifa->cstamp = ifa->tstamp = jiffies;
574
575 ifa->rt = rt;
576
577 /*
578 * part one of RFC 4429, section 3.3
579 * We should not configure an address as
580 * optimistic if we do not yet know the link
581 * layer address of our nexhop router
582 */
583
584 if (rt->rt6i_nexthop == NULL)
585 ifa->flags &= ~IFA_F_OPTIMISTIC;
586
587 ifa->idev = idev;
588 in6_dev_hold(idev);
589 /* For caller */
590 in6_ifa_hold(ifa);
591
592 /* Add to big hash table */
593 hash = ipv6_addr_hash(addr);
594
595 ifa->lst_next = inet6_addr_lst[hash];
596 inet6_addr_lst[hash] = ifa;
597 in6_ifa_hold(ifa);
598 write_unlock(&addrconf_hash_lock);
599
600 write_lock(&idev->lock);
601 /* Add to inet6_dev unicast addr list. */
602 ipv6_link_dev_addr(idev, ifa);
603
604 #ifdef CONFIG_IPV6_PRIVACY
605 if (ifa->flags&IFA_F_TEMPORARY) {
606 ifa->tmp_next = idev->tempaddr_list;
607 idev->tempaddr_list = ifa;
608 in6_ifa_hold(ifa);
609 }
610 #endif
611
612 in6_ifa_hold(ifa);
613 write_unlock(&idev->lock);
614 out2:
615 rcu_read_unlock_bh();
616
617 if (likely(err == 0))
618 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
619 else {
620 kfree(ifa);
621 ifa = ERR_PTR(err);
622 }
623
624 return ifa;
625 out:
626 write_unlock(&addrconf_hash_lock);
627 goto out2;
628 }
629
630 /* This function wants to get referenced ifp and releases it before return */
631
632 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
633 {
634 struct inet6_ifaddr *ifa, **ifap;
635 struct inet6_dev *idev = ifp->idev;
636 int hash;
637 int deleted = 0, onlink = 0;
638 unsigned long expires = jiffies;
639
640 hash = ipv6_addr_hash(&ifp->addr);
641
642 ifp->dead = 1;
643
644 write_lock_bh(&addrconf_hash_lock);
645 for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
646 ifap = &ifa->lst_next) {
647 if (ifa == ifp) {
648 *ifap = ifa->lst_next;
649 __in6_ifa_put(ifp);
650 ifa->lst_next = NULL;
651 break;
652 }
653 }
654 write_unlock_bh(&addrconf_hash_lock);
655
656 write_lock_bh(&idev->lock);
657 #ifdef CONFIG_IPV6_PRIVACY
658 if (ifp->flags&IFA_F_TEMPORARY) {
659 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
660 ifap = &ifa->tmp_next) {
661 if (ifa == ifp) {
662 *ifap = ifa->tmp_next;
663 if (ifp->ifpub) {
664 in6_ifa_put(ifp->ifpub);
665 ifp->ifpub = NULL;
666 }
667 __in6_ifa_put(ifp);
668 ifa->tmp_next = NULL;
669 break;
670 }
671 }
672 }
673 #endif
674
675 for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
676 if (ifa == ifp) {
677 *ifap = ifa->if_next;
678 __in6_ifa_put(ifp);
679 ifa->if_next = NULL;
680 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
681 break;
682 deleted = 1;
683 continue;
684 } else if (ifp->flags & IFA_F_PERMANENT) {
685 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
686 ifp->prefix_len)) {
687 if (ifa->flags & IFA_F_PERMANENT) {
688 onlink = 1;
689 if (deleted)
690 break;
691 } else {
692 unsigned long lifetime;
693
694 if (!onlink)
695 onlink = -1;
696
697 spin_lock(&ifa->lock);
698 lifetime = min_t(unsigned long,
699 ifa->valid_lft, 0x7fffffffUL/HZ);
700 if (time_before(expires,
701 ifa->tstamp + lifetime * HZ))
702 expires = ifa->tstamp + lifetime * HZ;
703 spin_unlock(&ifa->lock);
704 }
705 }
706 }
707 ifap = &ifa->if_next;
708 }
709 write_unlock_bh(&idev->lock);
710
711 ipv6_ifa_notify(RTM_DELADDR, ifp);
712
713 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
714
715 addrconf_del_timer(ifp);
716
717 /*
718 * Purge or update corresponding prefix
719 *
720 * 1) we don't purge prefix here if address was not permanent.
721 * prefix is managed by its own lifetime.
722 * 2) if there're no addresses, delete prefix.
723 * 3) if there're still other permanent address(es),
724 * corresponding prefix is still permanent.
725 * 4) otherwise, update prefix lifetime to the
726 * longest valid lifetime among the corresponding
727 * addresses on the device.
728 * Note: subsequent RA will update lifetime.
729 *
730 * --yoshfuji
731 */
732 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
733 struct in6_addr prefix;
734 struct rt6_info *rt;
735
736 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
737 rt = rt6_lookup(&prefix, NULL, ifp->idev->dev->ifindex, 1);
738
739 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
740 if (onlink == 0) {
741 ip6_del_rt(rt);
742 rt = NULL;
743 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
744 rt->rt6i_expires = expires;
745 rt->rt6i_flags |= RTF_EXPIRES;
746 }
747 }
748 dst_release(&rt->u.dst);
749 }
750
751 in6_ifa_put(ifp);
752 }
753
754 #ifdef CONFIG_IPV6_PRIVACY
755 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
756 {
757 struct inet6_dev *idev = ifp->idev;
758 struct in6_addr addr, *tmpaddr;
759 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
760 int tmp_plen;
761 int ret = 0;
762 int max_addresses;
763 u32 addr_flags;
764
765 write_lock(&idev->lock);
766 if (ift) {
767 spin_lock_bh(&ift->lock);
768 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
769 spin_unlock_bh(&ift->lock);
770 tmpaddr = &addr;
771 } else {
772 tmpaddr = NULL;
773 }
774 retry:
775 in6_dev_hold(idev);
776 if (idev->cnf.use_tempaddr <= 0) {
777 write_unlock(&idev->lock);
778 printk(KERN_INFO
779 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
780 in6_dev_put(idev);
781 ret = -1;
782 goto out;
783 }
784 spin_lock_bh(&ifp->lock);
785 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
786 idev->cnf.use_tempaddr = -1; /*XXX*/
787 spin_unlock_bh(&ifp->lock);
788 write_unlock(&idev->lock);
789 printk(KERN_WARNING
790 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
791 in6_dev_put(idev);
792 ret = -1;
793 goto out;
794 }
795 in6_ifa_hold(ifp);
796 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
797 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
798 spin_unlock_bh(&ifp->lock);
799 write_unlock(&idev->lock);
800 printk(KERN_WARNING
801 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
802 in6_ifa_put(ifp);
803 in6_dev_put(idev);
804 ret = -1;
805 goto out;
806 }
807 memcpy(&addr.s6_addr[8], idev->rndid, 8);
808 tmp_valid_lft = min_t(__u32,
809 ifp->valid_lft,
810 idev->cnf.temp_valid_lft);
811 tmp_prefered_lft = min_t(__u32,
812 ifp->prefered_lft,
813 idev->cnf.temp_prefered_lft - desync_factor / HZ);
814 tmp_plen = ifp->prefix_len;
815 max_addresses = idev->cnf.max_addresses;
816 tmp_cstamp = ifp->cstamp;
817 tmp_tstamp = ifp->tstamp;
818 spin_unlock_bh(&ifp->lock);
819
820 write_unlock(&idev->lock);
821
822 addr_flags = IFA_F_TEMPORARY;
823 /* set in addrconf_prefix_rcv() */
824 if (ifp->flags & IFA_F_OPTIMISTIC)
825 addr_flags |= IFA_F_OPTIMISTIC;
826
827 ift = !max_addresses ||
828 ipv6_count_addresses(idev) < max_addresses ?
829 ipv6_add_addr(idev, &addr, tmp_plen,
830 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
831 addr_flags) : NULL;
832 if (!ift || IS_ERR(ift)) {
833 in6_ifa_put(ifp);
834 in6_dev_put(idev);
835 printk(KERN_INFO
836 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
837 tmpaddr = &addr;
838 write_lock(&idev->lock);
839 goto retry;
840 }
841
842 spin_lock_bh(&ift->lock);
843 ift->ifpub = ifp;
844 ift->valid_lft = tmp_valid_lft;
845 ift->prefered_lft = tmp_prefered_lft;
846 ift->cstamp = tmp_cstamp;
847 ift->tstamp = tmp_tstamp;
848 spin_unlock_bh(&ift->lock);
849
850 addrconf_dad_start(ift, 0);
851 in6_ifa_put(ift);
852 in6_dev_put(idev);
853 out:
854 return ret;
855 }
856 #endif
857
858 /*
859 * Choose an appropriate source address (RFC3484)
860 */
861 struct ipv6_saddr_score {
862 int addr_type;
863 unsigned int attrs;
864 int matchlen;
865 int scope;
866 unsigned int rule;
867 };
868
869 #define IPV6_SADDR_SCORE_LOCAL 0x0001
870 #define IPV6_SADDR_SCORE_PREFERRED 0x0004
871 #define IPV6_SADDR_SCORE_HOA 0x0008
872 #define IPV6_SADDR_SCORE_OIF 0x0010
873 #define IPV6_SADDR_SCORE_LABEL 0x0020
874 #define IPV6_SADDR_SCORE_PRIVACY 0x0040
875
876 static inline int ipv6_saddr_preferred(int type)
877 {
878 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
879 IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
880 return 1;
881 return 0;
882 }
883
884 int ipv6_dev_get_saddr(struct net_device *daddr_dev,
885 struct in6_addr *daddr, struct in6_addr *saddr)
886 {
887 struct ipv6_saddr_score hiscore;
888 struct inet6_ifaddr *ifa_result = NULL;
889 int daddr_type = __ipv6_addr_type(daddr);
890 int daddr_scope = __ipv6_addr_src_scope(daddr_type);
891 int daddr_ifindex = daddr_dev ? daddr_dev->ifindex : 0;
892 u32 daddr_label = ipv6_addr_label(daddr, daddr_type, daddr_ifindex);
893 struct net_device *dev;
894
895 memset(&hiscore, 0, sizeof(hiscore));
896
897 read_lock(&dev_base_lock);
898 rcu_read_lock();
899
900 for_each_netdev(&init_net, dev) {
901 struct inet6_dev *idev;
902 struct inet6_ifaddr *ifa;
903
904 /* Rule 0: Candidate Source Address (section 4)
905 * - multicast and link-local destination address,
906 * the set of candidate source address MUST only
907 * include addresses assigned to interfaces
908 * belonging to the same link as the outgoing
909 * interface.
910 * (- For site-local destination addresses, the
911 * set of candidate source addresses MUST only
912 * include addresses assigned to interfaces
913 * belonging to the same site as the outgoing
914 * interface.)
915 */
916 if ((daddr_type & IPV6_ADDR_MULTICAST ||
917 daddr_scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
918 daddr_dev && dev != daddr_dev)
919 continue;
920
921 idev = __in6_dev_get(dev);
922 if (!idev)
923 continue;
924
925 read_lock_bh(&idev->lock);
926 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
927 struct ipv6_saddr_score score;
928
929 score.addr_type = __ipv6_addr_type(&ifa->addr);
930
931 /* Rule 0:
932 * - Tentative Address (RFC2462 section 5.4)
933 * - A tentative address is not considered
934 * "assigned to an interface" in the traditional
935 * sense, unless it is also flagged as optimistic.
936 * - Candidate Source Address (section 4)
937 * - In any case, anycast addresses, multicast
938 * addresses, and the unspecified address MUST
939 * NOT be included in a candidate set.
940 */
941 if ((ifa->flags & IFA_F_TENTATIVE) &&
942 (!(ifa->flags & IFA_F_OPTIMISTIC)))
943 continue;
944 if (unlikely(score.addr_type == IPV6_ADDR_ANY ||
945 score.addr_type & IPV6_ADDR_MULTICAST)) {
946 LIMIT_NETDEBUG(KERN_DEBUG
947 "ADDRCONF: unspecified / multicast address "
948 "assigned as unicast address on %s",
949 dev->name);
950 continue;
951 }
952
953 score.attrs = 0;
954 score.matchlen = 0;
955 score.scope = 0;
956 score.rule = 0;
957
958 if (ifa_result == NULL) {
959 /* record it if the first available entry */
960 goto record_it;
961 }
962
963 /* Rule 1: Prefer same address */
964 if (hiscore.rule < 1) {
965 if (ipv6_addr_equal(&ifa_result->addr, daddr))
966 hiscore.attrs |= IPV6_SADDR_SCORE_LOCAL;
967 hiscore.rule++;
968 }
969 if (ipv6_addr_equal(&ifa->addr, daddr)) {
970 score.attrs |= IPV6_SADDR_SCORE_LOCAL;
971 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)) {
972 score.rule = 1;
973 goto record_it;
974 }
975 } else {
976 if (hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)
977 continue;
978 }
979
980 /* Rule 2: Prefer appropriate scope */
981 if (hiscore.rule < 2) {
982 hiscore.scope = __ipv6_addr_src_scope(hiscore.addr_type);
983 hiscore.rule++;
984 }
985 score.scope = __ipv6_addr_src_scope(score.addr_type);
986 if (hiscore.scope < score.scope) {
987 if (hiscore.scope < daddr_scope) {
988 score.rule = 2;
989 goto record_it;
990 } else
991 continue;
992 } else if (score.scope < hiscore.scope) {
993 if (score.scope < daddr_scope)
994 break; /* addresses sorted by scope */
995 else {
996 score.rule = 2;
997 goto record_it;
998 }
999 }
1000
1001 /* Rule 3: Avoid deprecated and optimistic addresses */
1002 if (hiscore.rule < 3) {
1003 if (ipv6_saddr_preferred(hiscore.addr_type) ||
1004 (((ifa_result->flags &
1005 (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)) == 0)))
1006 hiscore.attrs |= IPV6_SADDR_SCORE_PREFERRED;
1007 hiscore.rule++;
1008 }
1009 if (ipv6_saddr_preferred(score.addr_type) ||
1010 (((ifa->flags &
1011 (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)) == 0))) {
1012 score.attrs |= IPV6_SADDR_SCORE_PREFERRED;
1013 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)) {
1014 score.rule = 3;
1015 goto record_it;
1016 }
1017 } else {
1018 if (hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)
1019 continue;
1020 }
1021
1022 /* Rule 4: Prefer home address */
1023 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
1024 if (hiscore.rule < 4) {
1025 if (ifa_result->flags & IFA_F_HOMEADDRESS)
1026 hiscore.attrs |= IPV6_SADDR_SCORE_HOA;
1027 hiscore.rule++;
1028 }
1029 if (ifa->flags & IFA_F_HOMEADDRESS) {
1030 score.attrs |= IPV6_SADDR_SCORE_HOA;
1031 if (!(ifa_result->flags & IFA_F_HOMEADDRESS)) {
1032 score.rule = 4;
1033 goto record_it;
1034 }
1035 } else {
1036 if (hiscore.attrs & IPV6_SADDR_SCORE_HOA)
1037 continue;
1038 }
1039 #else
1040 if (hiscore.rule < 4)
1041 hiscore.rule++;
1042 #endif
1043
1044 /* Rule 5: Prefer outgoing interface */
1045 if (hiscore.rule < 5) {
1046 if (daddr_dev == NULL ||
1047 daddr_dev == ifa_result->idev->dev)
1048 hiscore.attrs |= IPV6_SADDR_SCORE_OIF;
1049 hiscore.rule++;
1050 }
1051 if (daddr_dev == NULL ||
1052 daddr_dev == ifa->idev->dev) {
1053 score.attrs |= IPV6_SADDR_SCORE_OIF;
1054 if (!(hiscore.attrs & IPV6_SADDR_SCORE_OIF)) {
1055 score.rule = 5;
1056 goto record_it;
1057 }
1058 } else {
1059 if (hiscore.attrs & IPV6_SADDR_SCORE_OIF)
1060 continue;
1061 }
1062
1063 /* Rule 6: Prefer matching label */
1064 if (hiscore.rule < 6) {
1065 if (ipv6_addr_label(&ifa_result->addr,
1066 hiscore.addr_type,
1067 ifa_result->idev->dev->ifindex) == daddr_label)
1068 hiscore.attrs |= IPV6_SADDR_SCORE_LABEL;
1069 hiscore.rule++;
1070 }
1071 if (ipv6_addr_label(&ifa->addr,
1072 score.addr_type,
1073 ifa->idev->dev->ifindex) == daddr_label) {
1074 score.attrs |= IPV6_SADDR_SCORE_LABEL;
1075 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LABEL)) {
1076 score.rule = 6;
1077 goto record_it;
1078 }
1079 } else {
1080 if (hiscore.attrs & IPV6_SADDR_SCORE_LABEL)
1081 continue;
1082 }
1083
1084 #ifdef CONFIG_IPV6_PRIVACY
1085 /* Rule 7: Prefer public address
1086 * Note: prefer temprary address if use_tempaddr >= 2
1087 */
1088 if (hiscore.rule < 7) {
1089 if ((!(ifa_result->flags & IFA_F_TEMPORARY)) ^
1090 (ifa_result->idev->cnf.use_tempaddr >= 2))
1091 hiscore.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1092 hiscore.rule++;
1093 }
1094 if ((!(ifa->flags & IFA_F_TEMPORARY)) ^
1095 (ifa->idev->cnf.use_tempaddr >= 2)) {
1096 score.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1097 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)) {
1098 score.rule = 7;
1099 goto record_it;
1100 }
1101 } else {
1102 if (hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)
1103 continue;
1104 }
1105 #else
1106 if (hiscore.rule < 7)
1107 hiscore.rule++;
1108 #endif
1109 /* Rule 8: Use longest matching prefix */
1110 if (hiscore.rule < 8) {
1111 hiscore.matchlen = ipv6_addr_diff(&ifa_result->addr, daddr);
1112 hiscore.rule++;
1113 }
1114 score.matchlen = ipv6_addr_diff(&ifa->addr, daddr);
1115 if (score.matchlen > hiscore.matchlen) {
1116 score.rule = 8;
1117 goto record_it;
1118 }
1119 #if 0
1120 else if (score.matchlen < hiscore.matchlen)
1121 continue;
1122 #endif
1123
1124 /* Final Rule: choose first available one */
1125 continue;
1126 record_it:
1127 if (ifa_result)
1128 in6_ifa_put(ifa_result);
1129 in6_ifa_hold(ifa);
1130 ifa_result = ifa;
1131 hiscore = score;
1132 }
1133 read_unlock_bh(&idev->lock);
1134 }
1135 rcu_read_unlock();
1136 read_unlock(&dev_base_lock);
1137
1138 if (!ifa_result)
1139 return -EADDRNOTAVAIL;
1140
1141 ipv6_addr_copy(saddr, &ifa_result->addr);
1142 in6_ifa_put(ifa_result);
1143 return 0;
1144 }
1145
1146
1147 int ipv6_get_saddr(struct dst_entry *dst,
1148 struct in6_addr *daddr, struct in6_addr *saddr)
1149 {
1150 return ipv6_dev_get_saddr(dst ? ip6_dst_idev(dst)->dev : NULL, daddr, saddr);
1151 }
1152
1153 EXPORT_SYMBOL(ipv6_get_saddr);
1154
1155 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1156 unsigned char banned_flags)
1157 {
1158 struct inet6_dev *idev;
1159 int err = -EADDRNOTAVAIL;
1160
1161 rcu_read_lock();
1162 if ((idev = __in6_dev_get(dev)) != NULL) {
1163 struct inet6_ifaddr *ifp;
1164
1165 read_lock_bh(&idev->lock);
1166 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1167 if (ifp->scope == IFA_LINK && !(ifp->flags & banned_flags)) {
1168 ipv6_addr_copy(addr, &ifp->addr);
1169 err = 0;
1170 break;
1171 }
1172 }
1173 read_unlock_bh(&idev->lock);
1174 }
1175 rcu_read_unlock();
1176 return err;
1177 }
1178
1179 static int ipv6_count_addresses(struct inet6_dev *idev)
1180 {
1181 int cnt = 0;
1182 struct inet6_ifaddr *ifp;
1183
1184 read_lock_bh(&idev->lock);
1185 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1186 cnt++;
1187 read_unlock_bh(&idev->lock);
1188 return cnt;
1189 }
1190
1191 int ipv6_chk_addr(struct in6_addr *addr, struct net_device *dev, int strict)
1192 {
1193 struct inet6_ifaddr * ifp;
1194 u8 hash = ipv6_addr_hash(addr);
1195
1196 read_lock_bh(&addrconf_hash_lock);
1197 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1198 if (ipv6_addr_equal(&ifp->addr, addr) &&
1199 !(ifp->flags&IFA_F_TENTATIVE)) {
1200 if (dev == NULL || ifp->idev->dev == dev ||
1201 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1202 break;
1203 }
1204 }
1205 read_unlock_bh(&addrconf_hash_lock);
1206 return ifp != NULL;
1207 }
1208
1209 EXPORT_SYMBOL(ipv6_chk_addr);
1210
1211 static
1212 int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev)
1213 {
1214 struct inet6_ifaddr * ifp;
1215 u8 hash = ipv6_addr_hash(addr);
1216
1217 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1218 if (ipv6_addr_equal(&ifp->addr, addr)) {
1219 if (dev == NULL || ifp->idev->dev == dev)
1220 break;
1221 }
1222 }
1223 return ifp != NULL;
1224 }
1225
1226 struct inet6_ifaddr * ipv6_get_ifaddr(struct in6_addr *addr, struct net_device *dev, int strict)
1227 {
1228 struct inet6_ifaddr * ifp;
1229 u8 hash = ipv6_addr_hash(addr);
1230
1231 read_lock_bh(&addrconf_hash_lock);
1232 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1233 if (ipv6_addr_equal(&ifp->addr, addr)) {
1234 if (dev == NULL || ifp->idev->dev == dev ||
1235 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1236 in6_ifa_hold(ifp);
1237 break;
1238 }
1239 }
1240 }
1241 read_unlock_bh(&addrconf_hash_lock);
1242
1243 return ifp;
1244 }
1245
1246 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1247 {
1248 const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
1249 const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
1250 __be32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
1251 __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1252 int sk_ipv6only = ipv6_only_sock(sk);
1253 int sk2_ipv6only = inet_v6_ipv6only(sk2);
1254 int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1255 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1256
1257 if (!sk2_rcv_saddr && !sk_ipv6only)
1258 return 1;
1259
1260 if (addr_type2 == IPV6_ADDR_ANY &&
1261 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1262 return 1;
1263
1264 if (addr_type == IPV6_ADDR_ANY &&
1265 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1266 return 1;
1267
1268 if (sk2_rcv_saddr6 &&
1269 ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1270 return 1;
1271
1272 if (addr_type == IPV6_ADDR_MAPPED &&
1273 !sk2_ipv6only &&
1274 (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1275 return 1;
1276
1277 return 0;
1278 }
1279
1280 /* Gets referenced address, destroys ifaddr */
1281
1282 static void addrconf_dad_stop(struct inet6_ifaddr *ifp)
1283 {
1284 if (ifp->flags&IFA_F_PERMANENT) {
1285 spin_lock_bh(&ifp->lock);
1286 addrconf_del_timer(ifp);
1287 ifp->flags |= IFA_F_TENTATIVE;
1288 spin_unlock_bh(&ifp->lock);
1289 in6_ifa_put(ifp);
1290 #ifdef CONFIG_IPV6_PRIVACY
1291 } else if (ifp->flags&IFA_F_TEMPORARY) {
1292 struct inet6_ifaddr *ifpub;
1293 spin_lock_bh(&ifp->lock);
1294 ifpub = ifp->ifpub;
1295 if (ifpub) {
1296 in6_ifa_hold(ifpub);
1297 spin_unlock_bh(&ifp->lock);
1298 ipv6_create_tempaddr(ifpub, ifp);
1299 in6_ifa_put(ifpub);
1300 } else {
1301 spin_unlock_bh(&ifp->lock);
1302 }
1303 ipv6_del_addr(ifp);
1304 #endif
1305 } else
1306 ipv6_del_addr(ifp);
1307 }
1308
1309 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1310 {
1311 if (net_ratelimit())
1312 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1313 addrconf_dad_stop(ifp);
1314 }
1315
1316 /* Join to solicited addr multicast group. */
1317
1318 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1319 {
1320 struct in6_addr maddr;
1321
1322 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1323 return;
1324
1325 addrconf_addr_solict_mult(addr, &maddr);
1326 ipv6_dev_mc_inc(dev, &maddr);
1327 }
1328
1329 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1330 {
1331 struct in6_addr maddr;
1332
1333 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1334 return;
1335
1336 addrconf_addr_solict_mult(addr, &maddr);
1337 __ipv6_dev_mc_dec(idev, &maddr);
1338 }
1339
1340 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1341 {
1342 struct in6_addr addr;
1343 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1344 if (ipv6_addr_any(&addr))
1345 return;
1346 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1347 }
1348
1349 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1350 {
1351 struct in6_addr addr;
1352 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1353 if (ipv6_addr_any(&addr))
1354 return;
1355 __ipv6_dev_ac_dec(ifp->idev, &addr);
1356 }
1357
1358 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1359 {
1360 if (dev->addr_len != ETH_ALEN)
1361 return -1;
1362 memcpy(eui, dev->dev_addr, 3);
1363 memcpy(eui + 5, dev->dev_addr + 3, 3);
1364
1365 /*
1366 * The zSeries OSA network cards can be shared among various
1367 * OS instances, but the OSA cards have only one MAC address.
1368 * This leads to duplicate address conflicts in conjunction
1369 * with IPv6 if more than one instance uses the same card.
1370 *
1371 * The driver for these cards can deliver a unique 16-bit
1372 * identifier for each instance sharing the same card. It is
1373 * placed instead of 0xFFFE in the interface identifier. The
1374 * "u" bit of the interface identifier is not inverted in this
1375 * case. Hence the resulting interface identifier has local
1376 * scope according to RFC2373.
1377 */
1378 if (dev->dev_id) {
1379 eui[3] = (dev->dev_id >> 8) & 0xFF;
1380 eui[4] = dev->dev_id & 0xFF;
1381 } else {
1382 eui[3] = 0xFF;
1383 eui[4] = 0xFE;
1384 eui[0] ^= 2;
1385 }
1386 return 0;
1387 }
1388
1389 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1390 {
1391 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1392 if (dev->addr_len != ARCNET_ALEN)
1393 return -1;
1394 memset(eui, 0, 7);
1395 eui[7] = *(u8*)dev->dev_addr;
1396 return 0;
1397 }
1398
1399 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1400 {
1401 if (dev->addr_len != INFINIBAND_ALEN)
1402 return -1;
1403 memcpy(eui, dev->dev_addr + 12, 8);
1404 eui[0] |= 2;
1405 return 0;
1406 }
1407
1408 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1409 {
1410 switch (dev->type) {
1411 case ARPHRD_ETHER:
1412 case ARPHRD_FDDI:
1413 case ARPHRD_IEEE802_TR:
1414 return addrconf_ifid_eui48(eui, dev);
1415 case ARPHRD_ARCNET:
1416 return addrconf_ifid_arcnet(eui, dev);
1417 case ARPHRD_INFINIBAND:
1418 return addrconf_ifid_infiniband(eui, dev);
1419 case ARPHRD_SIT:
1420 if (dev->priv_flags & IFF_ISATAP)
1421 return ipv6_isatap_eui64(eui, *(__be32 *)dev->dev_addr);
1422 }
1423 return -1;
1424 }
1425
1426 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1427 {
1428 int err = -1;
1429 struct inet6_ifaddr *ifp;
1430
1431 read_lock_bh(&idev->lock);
1432 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1433 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1434 memcpy(eui, ifp->addr.s6_addr+8, 8);
1435 err = 0;
1436 break;
1437 }
1438 }
1439 read_unlock_bh(&idev->lock);
1440 return err;
1441 }
1442
1443 #ifdef CONFIG_IPV6_PRIVACY
1444 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1445 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1446 {
1447 regen:
1448 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1449 idev->rndid[0] &= ~0x02;
1450
1451 /*
1452 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1453 * check if generated address is not inappropriate
1454 *
1455 * - Reserved subnet anycast (RFC 2526)
1456 * 11111101 11....11 1xxxxxxx
1457 * - ISATAP (RFC4214) 6.1
1458 * 00-00-5E-FE-xx-xx-xx-xx
1459 * - value 0
1460 * - XXX: already assigned to an address on the device
1461 */
1462 if (idev->rndid[0] == 0xfd &&
1463 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1464 (idev->rndid[7]&0x80))
1465 goto regen;
1466 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1467 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1468 goto regen;
1469 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1470 goto regen;
1471 }
1472
1473 return 0;
1474 }
1475
1476 static void ipv6_regen_rndid(unsigned long data)
1477 {
1478 struct inet6_dev *idev = (struct inet6_dev *) data;
1479 unsigned long expires;
1480
1481 rcu_read_lock_bh();
1482 write_lock_bh(&idev->lock);
1483
1484 if (idev->dead)
1485 goto out;
1486
1487 if (__ipv6_regen_rndid(idev) < 0)
1488 goto out;
1489
1490 expires = jiffies +
1491 idev->cnf.temp_prefered_lft * HZ -
1492 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1493 if (time_before(expires, jiffies)) {
1494 printk(KERN_WARNING
1495 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1496 idev->dev->name);
1497 goto out;
1498 }
1499
1500 if (!mod_timer(&idev->regen_timer, expires))
1501 in6_dev_hold(idev);
1502
1503 out:
1504 write_unlock_bh(&idev->lock);
1505 rcu_read_unlock_bh();
1506 in6_dev_put(idev);
1507 }
1508
1509 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1510 int ret = 0;
1511
1512 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1513 ret = __ipv6_regen_rndid(idev);
1514 return ret;
1515 }
1516 #endif
1517
1518 /*
1519 * Add prefix route.
1520 */
1521
1522 static void
1523 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1524 unsigned long expires, u32 flags)
1525 {
1526 struct fib6_config cfg = {
1527 .fc_table = RT6_TABLE_PREFIX,
1528 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1529 .fc_ifindex = dev->ifindex,
1530 .fc_expires = expires,
1531 .fc_dst_len = plen,
1532 .fc_flags = RTF_UP | flags,
1533 };
1534
1535 ipv6_addr_copy(&cfg.fc_dst, pfx);
1536
1537 /* Prevent useless cloning on PtP SIT.
1538 This thing is done here expecting that the whole
1539 class of non-broadcast devices need not cloning.
1540 */
1541 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1542 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1543 cfg.fc_flags |= RTF_NONEXTHOP;
1544 #endif
1545
1546 ip6_route_add(&cfg);
1547 }
1548
1549 /* Create "default" multicast route to the interface */
1550
1551 static void addrconf_add_mroute(struct net_device *dev)
1552 {
1553 struct fib6_config cfg = {
1554 .fc_table = RT6_TABLE_LOCAL,
1555 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1556 .fc_ifindex = dev->ifindex,
1557 .fc_dst_len = 8,
1558 .fc_flags = RTF_UP,
1559 };
1560
1561 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1562
1563 ip6_route_add(&cfg);
1564 }
1565
1566 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1567 static void sit_route_add(struct net_device *dev)
1568 {
1569 struct fib6_config cfg = {
1570 .fc_table = RT6_TABLE_MAIN,
1571 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1572 .fc_ifindex = dev->ifindex,
1573 .fc_dst_len = 96,
1574 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1575 };
1576
1577 /* prefix length - 96 bits "::d.d.d.d" */
1578 ip6_route_add(&cfg);
1579 }
1580 #endif
1581
1582 static void addrconf_add_lroute(struct net_device *dev)
1583 {
1584 struct in6_addr addr;
1585
1586 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1587 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1588 }
1589
1590 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1591 {
1592 struct inet6_dev *idev;
1593
1594 ASSERT_RTNL();
1595
1596 if ((idev = ipv6_find_idev(dev)) == NULL)
1597 return NULL;
1598
1599 /* Add default multicast route */
1600 addrconf_add_mroute(dev);
1601
1602 /* Add link local route */
1603 addrconf_add_lroute(dev);
1604 return idev;
1605 }
1606
1607 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1608 {
1609 struct prefix_info *pinfo;
1610 __u32 valid_lft;
1611 __u32 prefered_lft;
1612 int addr_type;
1613 unsigned long rt_expires;
1614 struct inet6_dev *in6_dev;
1615
1616 pinfo = (struct prefix_info *) opt;
1617
1618 if (len < sizeof(struct prefix_info)) {
1619 ADBG(("addrconf: prefix option too short\n"));
1620 return;
1621 }
1622
1623 /*
1624 * Validation checks ([ADDRCONF], page 19)
1625 */
1626
1627 addr_type = ipv6_addr_type(&pinfo->prefix);
1628
1629 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1630 return;
1631
1632 valid_lft = ntohl(pinfo->valid);
1633 prefered_lft = ntohl(pinfo->prefered);
1634
1635 if (prefered_lft > valid_lft) {
1636 if (net_ratelimit())
1637 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1638 return;
1639 }
1640
1641 in6_dev = in6_dev_get(dev);
1642
1643 if (in6_dev == NULL) {
1644 if (net_ratelimit())
1645 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1646 return;
1647 }
1648
1649 /*
1650 * Two things going on here:
1651 * 1) Add routes for on-link prefixes
1652 * 2) Configure prefixes with the auto flag set
1653 */
1654
1655 /* Avoid arithmetic overflow. Really, we could
1656 save rt_expires in seconds, likely valid_lft,
1657 but it would require division in fib gc, that it
1658 not good.
1659 */
1660 if (valid_lft >= 0x7FFFFFFF/HZ)
1661 rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ);
1662 else
1663 rt_expires = valid_lft * HZ;
1664
1665 /*
1666 * We convert this (in jiffies) to clock_t later.
1667 * Avoid arithmetic overflow there as well.
1668 * Overflow can happen only if HZ < USER_HZ.
1669 */
1670 if (HZ < USER_HZ && rt_expires > 0x7FFFFFFF / USER_HZ)
1671 rt_expires = 0x7FFFFFFF / USER_HZ;
1672
1673 if (pinfo->onlink) {
1674 struct rt6_info *rt;
1675 rt = rt6_lookup(&pinfo->prefix, NULL, dev->ifindex, 1);
1676
1677 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
1678 if (rt->rt6i_flags&RTF_EXPIRES) {
1679 if (valid_lft == 0) {
1680 ip6_del_rt(rt);
1681 rt = NULL;
1682 } else {
1683 rt->rt6i_expires = jiffies + rt_expires;
1684 }
1685 }
1686 } else if (valid_lft) {
1687 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1688 dev, jiffies_to_clock_t(rt_expires), RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT);
1689 }
1690 if (rt)
1691 dst_release(&rt->u.dst);
1692 }
1693
1694 /* Try to figure out our local address for this prefix */
1695
1696 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1697 struct inet6_ifaddr * ifp;
1698 struct in6_addr addr;
1699 int create = 0, update_lft = 0;
1700
1701 if (pinfo->prefix_len == 64) {
1702 memcpy(&addr, &pinfo->prefix, 8);
1703 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1704 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1705 in6_dev_put(in6_dev);
1706 return;
1707 }
1708 goto ok;
1709 }
1710 if (net_ratelimit())
1711 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1712 pinfo->prefix_len);
1713 in6_dev_put(in6_dev);
1714 return;
1715
1716 ok:
1717
1718 ifp = ipv6_get_ifaddr(&addr, dev, 1);
1719
1720 if (ifp == NULL && valid_lft) {
1721 int max_addresses = in6_dev->cnf.max_addresses;
1722 u32 addr_flags = 0;
1723
1724 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1725 if (in6_dev->cnf.optimistic_dad &&
1726 !ipv6_devconf.forwarding)
1727 addr_flags = IFA_F_OPTIMISTIC;
1728 #endif
1729
1730 /* Do not allow to create too much of autoconfigured
1731 * addresses; this would be too easy way to crash kernel.
1732 */
1733 if (!max_addresses ||
1734 ipv6_count_addresses(in6_dev) < max_addresses)
1735 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1736 addr_type&IPV6_ADDR_SCOPE_MASK,
1737 addr_flags);
1738
1739 if (!ifp || IS_ERR(ifp)) {
1740 in6_dev_put(in6_dev);
1741 return;
1742 }
1743
1744 update_lft = create = 1;
1745 ifp->cstamp = jiffies;
1746 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1747 }
1748
1749 if (ifp) {
1750 int flags;
1751 unsigned long now;
1752 #ifdef CONFIG_IPV6_PRIVACY
1753 struct inet6_ifaddr *ift;
1754 #endif
1755 u32 stored_lft;
1756
1757 /* update lifetime (RFC2462 5.5.3 e) */
1758 spin_lock(&ifp->lock);
1759 now = jiffies;
1760 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1761 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1762 else
1763 stored_lft = 0;
1764 if (!update_lft && stored_lft) {
1765 if (valid_lft > MIN_VALID_LIFETIME ||
1766 valid_lft > stored_lft)
1767 update_lft = 1;
1768 else if (stored_lft <= MIN_VALID_LIFETIME) {
1769 /* valid_lft <= stored_lft is always true */
1770 /* XXX: IPsec */
1771 update_lft = 0;
1772 } else {
1773 valid_lft = MIN_VALID_LIFETIME;
1774 if (valid_lft < prefered_lft)
1775 prefered_lft = valid_lft;
1776 update_lft = 1;
1777 }
1778 }
1779
1780 if (update_lft) {
1781 ifp->valid_lft = valid_lft;
1782 ifp->prefered_lft = prefered_lft;
1783 ifp->tstamp = now;
1784 flags = ifp->flags;
1785 ifp->flags &= ~IFA_F_DEPRECATED;
1786 spin_unlock(&ifp->lock);
1787
1788 if (!(flags&IFA_F_TENTATIVE))
1789 ipv6_ifa_notify(0, ifp);
1790 } else
1791 spin_unlock(&ifp->lock);
1792
1793 #ifdef CONFIG_IPV6_PRIVACY
1794 read_lock_bh(&in6_dev->lock);
1795 /* update all temporary addresses in the list */
1796 for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1797 /*
1798 * When adjusting the lifetimes of an existing
1799 * temporary address, only lower the lifetimes.
1800 * Implementations must not increase the
1801 * lifetimes of an existing temporary address
1802 * when processing a Prefix Information Option.
1803 */
1804 spin_lock(&ift->lock);
1805 flags = ift->flags;
1806 if (ift->valid_lft > valid_lft &&
1807 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1808 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1809 if (ift->prefered_lft > prefered_lft &&
1810 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1811 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1812 spin_unlock(&ift->lock);
1813 if (!(flags&IFA_F_TENTATIVE))
1814 ipv6_ifa_notify(0, ift);
1815 }
1816
1817 if (create && in6_dev->cnf.use_tempaddr > 0) {
1818 /*
1819 * When a new public address is created as described in [ADDRCONF],
1820 * also create a new temporary address.
1821 */
1822 read_unlock_bh(&in6_dev->lock);
1823 ipv6_create_tempaddr(ifp, NULL);
1824 } else {
1825 read_unlock_bh(&in6_dev->lock);
1826 }
1827 #endif
1828 in6_ifa_put(ifp);
1829 addrconf_verify(0);
1830 }
1831 }
1832 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
1833 in6_dev_put(in6_dev);
1834 }
1835
1836 /*
1837 * Set destination address.
1838 * Special case for SIT interfaces where we create a new "virtual"
1839 * device.
1840 */
1841 int addrconf_set_dstaddr(void __user *arg)
1842 {
1843 struct in6_ifreq ireq;
1844 struct net_device *dev;
1845 int err = -EINVAL;
1846
1847 rtnl_lock();
1848
1849 err = -EFAULT;
1850 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1851 goto err_exit;
1852
1853 dev = __dev_get_by_index(&init_net, ireq.ifr6_ifindex);
1854
1855 err = -ENODEV;
1856 if (dev == NULL)
1857 goto err_exit;
1858
1859 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1860 if (dev->type == ARPHRD_SIT) {
1861 struct ifreq ifr;
1862 mm_segment_t oldfs;
1863 struct ip_tunnel_parm p;
1864
1865 err = -EADDRNOTAVAIL;
1866 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
1867 goto err_exit;
1868
1869 memset(&p, 0, sizeof(p));
1870 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
1871 p.iph.saddr = 0;
1872 p.iph.version = 4;
1873 p.iph.ihl = 5;
1874 p.iph.protocol = IPPROTO_IPV6;
1875 p.iph.ttl = 64;
1876 ifr.ifr_ifru.ifru_data = (void __user *)&p;
1877
1878 oldfs = get_fs(); set_fs(KERNEL_DS);
1879 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
1880 set_fs(oldfs);
1881
1882 if (err == 0) {
1883 err = -ENOBUFS;
1884 if ((dev = __dev_get_by_name(&init_net, p.name)) == NULL)
1885 goto err_exit;
1886 err = dev_open(dev);
1887 }
1888 }
1889 #endif
1890
1891 err_exit:
1892 rtnl_unlock();
1893 return err;
1894 }
1895
1896 /*
1897 * Manual configuration of address on an interface
1898 */
1899 static int inet6_addr_add(int ifindex, struct in6_addr *pfx, int plen,
1900 __u8 ifa_flags, __u32 prefered_lft, __u32 valid_lft)
1901 {
1902 struct inet6_ifaddr *ifp;
1903 struct inet6_dev *idev;
1904 struct net_device *dev;
1905 int scope;
1906 u32 flags = RTF_EXPIRES;
1907
1908 ASSERT_RTNL();
1909
1910 /* check the lifetime */
1911 if (!valid_lft || prefered_lft > valid_lft)
1912 return -EINVAL;
1913
1914 if ((dev = __dev_get_by_index(&init_net, ifindex)) == NULL)
1915 return -ENODEV;
1916
1917 if ((idev = addrconf_add_dev(dev)) == NULL)
1918 return -ENOBUFS;
1919
1920 scope = ipv6_addr_scope(pfx);
1921
1922 if (valid_lft == INFINITY_LIFE_TIME) {
1923 ifa_flags |= IFA_F_PERMANENT;
1924 flags = 0;
1925 } else if (valid_lft >= 0x7FFFFFFF/HZ)
1926 valid_lft = 0x7FFFFFFF/HZ;
1927
1928 if (prefered_lft == 0)
1929 ifa_flags |= IFA_F_DEPRECATED;
1930 else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
1931 (prefered_lft != INFINITY_LIFE_TIME))
1932 prefered_lft = 0x7FFFFFFF/HZ;
1933
1934 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
1935
1936 if (!IS_ERR(ifp)) {
1937 spin_lock_bh(&ifp->lock);
1938 ifp->valid_lft = valid_lft;
1939 ifp->prefered_lft = prefered_lft;
1940 ifp->tstamp = jiffies;
1941 spin_unlock_bh(&ifp->lock);
1942
1943 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
1944 jiffies_to_clock_t(valid_lft * HZ), flags);
1945 /*
1946 * Note that section 3.1 of RFC 4429 indicates
1947 * that the Optimistic flag should not be set for
1948 * manually configured addresses
1949 */
1950 addrconf_dad_start(ifp, 0);
1951 in6_ifa_put(ifp);
1952 addrconf_verify(0);
1953 return 0;
1954 }
1955
1956 return PTR_ERR(ifp);
1957 }
1958
1959 static int inet6_addr_del(int ifindex, struct in6_addr *pfx, int plen)
1960 {
1961 struct inet6_ifaddr *ifp;
1962 struct inet6_dev *idev;
1963 struct net_device *dev;
1964
1965 if ((dev = __dev_get_by_index(&init_net, ifindex)) == NULL)
1966 return -ENODEV;
1967
1968 if ((idev = __in6_dev_get(dev)) == NULL)
1969 return -ENXIO;
1970
1971 read_lock_bh(&idev->lock);
1972 for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
1973 if (ifp->prefix_len == plen &&
1974 ipv6_addr_equal(pfx, &ifp->addr)) {
1975 in6_ifa_hold(ifp);
1976 read_unlock_bh(&idev->lock);
1977
1978 ipv6_del_addr(ifp);
1979
1980 /* If the last address is deleted administratively,
1981 disable IPv6 on this interface.
1982 */
1983 if (idev->addr_list == NULL)
1984 addrconf_ifdown(idev->dev, 1);
1985 return 0;
1986 }
1987 }
1988 read_unlock_bh(&idev->lock);
1989 return -EADDRNOTAVAIL;
1990 }
1991
1992
1993 int addrconf_add_ifaddr(void __user *arg)
1994 {
1995 struct in6_ifreq ireq;
1996 int err;
1997
1998 if (!capable(CAP_NET_ADMIN))
1999 return -EPERM;
2000
2001 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2002 return -EFAULT;
2003
2004 rtnl_lock();
2005 err = inet6_addr_add(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen,
2006 IFA_F_PERMANENT, INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2007 rtnl_unlock();
2008 return err;
2009 }
2010
2011 int addrconf_del_ifaddr(void __user *arg)
2012 {
2013 struct in6_ifreq ireq;
2014 int err;
2015
2016 if (!capable(CAP_NET_ADMIN))
2017 return -EPERM;
2018
2019 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2020 return -EFAULT;
2021
2022 rtnl_lock();
2023 err = inet6_addr_del(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
2024 rtnl_unlock();
2025 return err;
2026 }
2027
2028 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2029 static void sit_add_v4_addrs(struct inet6_dev *idev)
2030 {
2031 struct inet6_ifaddr * ifp;
2032 struct in6_addr addr;
2033 struct net_device *dev;
2034 int scope;
2035
2036 ASSERT_RTNL();
2037
2038 memset(&addr, 0, sizeof(struct in6_addr));
2039 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2040
2041 if (idev->dev->flags&IFF_POINTOPOINT) {
2042 addr.s6_addr32[0] = htonl(0xfe800000);
2043 scope = IFA_LINK;
2044 } else {
2045 scope = IPV6_ADDR_COMPATv4;
2046 }
2047
2048 if (addr.s6_addr32[3]) {
2049 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
2050 if (!IS_ERR(ifp)) {
2051 spin_lock_bh(&ifp->lock);
2052 ifp->flags &= ~IFA_F_TENTATIVE;
2053 spin_unlock_bh(&ifp->lock);
2054 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2055 in6_ifa_put(ifp);
2056 }
2057 return;
2058 }
2059
2060 for_each_netdev(&init_net, dev) {
2061 struct in_device * in_dev = __in_dev_get_rtnl(dev);
2062 if (in_dev && (dev->flags & IFF_UP)) {
2063 struct in_ifaddr * ifa;
2064
2065 int flag = scope;
2066
2067 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2068 int plen;
2069
2070 addr.s6_addr32[3] = ifa->ifa_local;
2071
2072 if (ifa->ifa_scope == RT_SCOPE_LINK)
2073 continue;
2074 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2075 if (idev->dev->flags&IFF_POINTOPOINT)
2076 continue;
2077 flag |= IFA_HOST;
2078 }
2079 if (idev->dev->flags&IFF_POINTOPOINT)
2080 plen = 64;
2081 else
2082 plen = 96;
2083
2084 ifp = ipv6_add_addr(idev, &addr, plen, flag,
2085 IFA_F_PERMANENT);
2086 if (!IS_ERR(ifp)) {
2087 spin_lock_bh(&ifp->lock);
2088 ifp->flags &= ~IFA_F_TENTATIVE;
2089 spin_unlock_bh(&ifp->lock);
2090 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2091 in6_ifa_put(ifp);
2092 }
2093 }
2094 }
2095 }
2096 }
2097 #endif
2098
2099 static void init_loopback(struct net_device *dev)
2100 {
2101 struct inet6_dev *idev;
2102 struct inet6_ifaddr * ifp;
2103
2104 /* ::1 */
2105
2106 ASSERT_RTNL();
2107
2108 if ((idev = ipv6_find_idev(dev)) == NULL) {
2109 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2110 return;
2111 }
2112
2113 ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
2114 if (!IS_ERR(ifp)) {
2115 spin_lock_bh(&ifp->lock);
2116 ifp->flags &= ~IFA_F_TENTATIVE;
2117 spin_unlock_bh(&ifp->lock);
2118 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2119 in6_ifa_put(ifp);
2120 }
2121 }
2122
2123 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2124 {
2125 struct inet6_ifaddr * ifp;
2126 u32 addr_flags = IFA_F_PERMANENT;
2127
2128 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2129 if (idev->cnf.optimistic_dad &&
2130 !ipv6_devconf.forwarding)
2131 addr_flags |= IFA_F_OPTIMISTIC;
2132 #endif
2133
2134
2135 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2136 if (!IS_ERR(ifp)) {
2137 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2138 addrconf_dad_start(ifp, 0);
2139 in6_ifa_put(ifp);
2140 }
2141 }
2142
2143 static void addrconf_dev_config(struct net_device *dev)
2144 {
2145 struct in6_addr addr;
2146 struct inet6_dev * idev;
2147
2148 ASSERT_RTNL();
2149
2150 if ((dev->type != ARPHRD_ETHER) &&
2151 (dev->type != ARPHRD_FDDI) &&
2152 (dev->type != ARPHRD_IEEE802_TR) &&
2153 (dev->type != ARPHRD_ARCNET) &&
2154 (dev->type != ARPHRD_INFINIBAND)) {
2155 /* Alas, we support only Ethernet autoconfiguration. */
2156 return;
2157 }
2158
2159 idev = addrconf_add_dev(dev);
2160 if (idev == NULL)
2161 return;
2162
2163 memset(&addr, 0, sizeof(struct in6_addr));
2164 addr.s6_addr32[0] = htonl(0xFE800000);
2165
2166 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2167 addrconf_add_linklocal(idev, &addr);
2168 }
2169
2170 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2171 static void addrconf_sit_config(struct net_device *dev)
2172 {
2173 struct inet6_dev *idev;
2174
2175 ASSERT_RTNL();
2176
2177 /*
2178 * Configure the tunnel with one of our IPv4
2179 * addresses... we should configure all of
2180 * our v4 addrs in the tunnel
2181 */
2182
2183 if ((idev = ipv6_find_idev(dev)) == NULL) {
2184 printk(KERN_DEBUG "init sit: add_dev failed\n");
2185 return;
2186 }
2187
2188 if (dev->priv_flags & IFF_ISATAP) {
2189 struct in6_addr addr;
2190
2191 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2192 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2193 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2194 addrconf_add_linklocal(idev, &addr);
2195 return;
2196 }
2197
2198 sit_add_v4_addrs(idev);
2199
2200 if (dev->flags&IFF_POINTOPOINT) {
2201 addrconf_add_mroute(dev);
2202 addrconf_add_lroute(dev);
2203 } else
2204 sit_route_add(dev);
2205 }
2206 #endif
2207
2208 static inline int
2209 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2210 {
2211 struct in6_addr lladdr;
2212
2213 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2214 addrconf_add_linklocal(idev, &lladdr);
2215 return 0;
2216 }
2217 return -1;
2218 }
2219
2220 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2221 {
2222 struct net_device *link_dev;
2223
2224 /* first try to inherit the link-local address from the link device */
2225 if (idev->dev->iflink &&
2226 (link_dev = __dev_get_by_index(&init_net, idev->dev->iflink))) {
2227 if (!ipv6_inherit_linklocal(idev, link_dev))
2228 return;
2229 }
2230 /* then try to inherit it from any device */
2231 for_each_netdev(&init_net, link_dev) {
2232 if (!ipv6_inherit_linklocal(idev, link_dev))
2233 return;
2234 }
2235 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2236 }
2237
2238 /*
2239 * Autoconfigure tunnel with a link-local address so routing protocols,
2240 * DHCPv6, MLD etc. can be run over the virtual link
2241 */
2242
2243 static void addrconf_ip6_tnl_config(struct net_device *dev)
2244 {
2245 struct inet6_dev *idev;
2246
2247 ASSERT_RTNL();
2248
2249 if ((idev = addrconf_add_dev(dev)) == NULL) {
2250 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2251 return;
2252 }
2253 ip6_tnl_add_linklocal(idev);
2254 }
2255
2256 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2257 void * data)
2258 {
2259 struct net_device *dev = (struct net_device *) data;
2260 struct inet6_dev *idev = __in6_dev_get(dev);
2261 int run_pending = 0;
2262 int err;
2263
2264 if (dev->nd_net != &init_net)
2265 return NOTIFY_DONE;
2266
2267 switch(event) {
2268 case NETDEV_REGISTER:
2269 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2270 idev = ipv6_add_dev(dev);
2271 if (!idev)
2272 return notifier_from_errno(-ENOMEM);
2273 }
2274 break;
2275 case NETDEV_UP:
2276 case NETDEV_CHANGE:
2277 if (dev->flags & IFF_SLAVE)
2278 break;
2279
2280 if (event == NETDEV_UP) {
2281 if (!addrconf_qdisc_ok(dev)) {
2282 /* device is not ready yet. */
2283 printk(KERN_INFO
2284 "ADDRCONF(NETDEV_UP): %s: "
2285 "link is not ready\n",
2286 dev->name);
2287 break;
2288 }
2289
2290 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2291 idev = ipv6_add_dev(dev);
2292
2293 if (idev)
2294 idev->if_flags |= IF_READY;
2295 } else {
2296 if (!addrconf_qdisc_ok(dev)) {
2297 /* device is still not ready. */
2298 break;
2299 }
2300
2301 if (idev) {
2302 if (idev->if_flags & IF_READY) {
2303 /* device is already configured. */
2304 break;
2305 }
2306 idev->if_flags |= IF_READY;
2307 }
2308
2309 printk(KERN_INFO
2310 "ADDRCONF(NETDEV_CHANGE): %s: "
2311 "link becomes ready\n",
2312 dev->name);
2313
2314 run_pending = 1;
2315 }
2316
2317 switch(dev->type) {
2318 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2319 case ARPHRD_SIT:
2320 addrconf_sit_config(dev);
2321 break;
2322 #endif
2323 case ARPHRD_TUNNEL6:
2324 addrconf_ip6_tnl_config(dev);
2325 break;
2326 case ARPHRD_LOOPBACK:
2327 init_loopback(dev);
2328 break;
2329
2330 default:
2331 addrconf_dev_config(dev);
2332 break;
2333 }
2334 if (idev) {
2335 if (run_pending)
2336 addrconf_dad_run(idev);
2337
2338 /* If the MTU changed during the interface down, when the
2339 interface up, the changed MTU must be reflected in the
2340 idev as well as routers.
2341 */
2342 if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2343 rt6_mtu_change(dev, dev->mtu);
2344 idev->cnf.mtu6 = dev->mtu;
2345 }
2346 idev->tstamp = jiffies;
2347 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2348 /* If the changed mtu during down is lower than IPV6_MIN_MTU
2349 stop IPv6 on this interface.
2350 */
2351 if (dev->mtu < IPV6_MIN_MTU)
2352 addrconf_ifdown(dev, event != NETDEV_DOWN);
2353 }
2354 break;
2355
2356 case NETDEV_CHANGEMTU:
2357 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2358 rt6_mtu_change(dev, dev->mtu);
2359 idev->cnf.mtu6 = dev->mtu;
2360 break;
2361 }
2362
2363 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2364 idev = ipv6_add_dev(dev);
2365 if (idev)
2366 break;
2367 }
2368
2369 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2370
2371 case NETDEV_DOWN:
2372 case NETDEV_UNREGISTER:
2373 /*
2374 * Remove all addresses from this interface.
2375 */
2376 addrconf_ifdown(dev, event != NETDEV_DOWN);
2377 break;
2378
2379 case NETDEV_CHANGENAME:
2380 if (idev) {
2381 snmp6_unregister_dev(idev);
2382 #ifdef CONFIG_SYSCTL
2383 addrconf_sysctl_unregister(&idev->cnf);
2384 neigh_sysctl_unregister(idev->nd_parms);
2385 neigh_sysctl_register(dev, idev->nd_parms,
2386 NET_IPV6, NET_IPV6_NEIGH, "ipv6",
2387 &ndisc_ifinfo_sysctl_change,
2388 NULL);
2389 addrconf_sysctl_register(idev);
2390 #endif
2391 err = snmp6_register_dev(idev);
2392 if (err)
2393 return notifier_from_errno(err);
2394 }
2395 break;
2396 }
2397
2398 return NOTIFY_OK;
2399 }
2400
2401 /*
2402 * addrconf module should be notified of a device going up
2403 */
2404 static struct notifier_block ipv6_dev_notf = {
2405 .notifier_call = addrconf_notify,
2406 .priority = 0
2407 };
2408
2409 static int addrconf_ifdown(struct net_device *dev, int how)
2410 {
2411 struct inet6_dev *idev;
2412 struct inet6_ifaddr *ifa, **bifa;
2413 int i;
2414
2415 ASSERT_RTNL();
2416
2417 if (dev == init_net.loopback_dev && how == 1)
2418 how = 0;
2419
2420 rt6_ifdown(dev);
2421 neigh_ifdown(&nd_tbl, dev);
2422
2423 idev = __in6_dev_get(dev);
2424 if (idev == NULL)
2425 return -ENODEV;
2426
2427 /* Step 1: remove reference to ipv6 device from parent device.
2428 Do not dev_put!
2429 */
2430 if (how == 1) {
2431 idev->dead = 1;
2432
2433 /* protected by rtnl_lock */
2434 rcu_assign_pointer(dev->ip6_ptr, NULL);
2435
2436 /* Step 1.5: remove snmp6 entry */
2437 snmp6_unregister_dev(idev);
2438
2439 }
2440
2441 /* Step 2: clear hash table */
2442 for (i=0; i<IN6_ADDR_HSIZE; i++) {
2443 bifa = &inet6_addr_lst[i];
2444
2445 write_lock_bh(&addrconf_hash_lock);
2446 while ((ifa = *bifa) != NULL) {
2447 if (ifa->idev == idev) {
2448 *bifa = ifa->lst_next;
2449 ifa->lst_next = NULL;
2450 addrconf_del_timer(ifa);
2451 in6_ifa_put(ifa);
2452 continue;
2453 }
2454 bifa = &ifa->lst_next;
2455 }
2456 write_unlock_bh(&addrconf_hash_lock);
2457 }
2458
2459 write_lock_bh(&idev->lock);
2460
2461 /* Step 3: clear flags for stateless addrconf */
2462 if (how != 1)
2463 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2464
2465 /* Step 4: clear address list */
2466 #ifdef CONFIG_IPV6_PRIVACY
2467 if (how == 1 && del_timer(&idev->regen_timer))
2468 in6_dev_put(idev);
2469
2470 /* clear tempaddr list */
2471 while ((ifa = idev->tempaddr_list) != NULL) {
2472 idev->tempaddr_list = ifa->tmp_next;
2473 ifa->tmp_next = NULL;
2474 ifa->dead = 1;
2475 write_unlock_bh(&idev->lock);
2476 spin_lock_bh(&ifa->lock);
2477
2478 if (ifa->ifpub) {
2479 in6_ifa_put(ifa->ifpub);
2480 ifa->ifpub = NULL;
2481 }
2482 spin_unlock_bh(&ifa->lock);
2483 in6_ifa_put(ifa);
2484 write_lock_bh(&idev->lock);
2485 }
2486 #endif
2487 while ((ifa = idev->addr_list) != NULL) {
2488 idev->addr_list = ifa->if_next;
2489 ifa->if_next = NULL;
2490 ifa->dead = 1;
2491 addrconf_del_timer(ifa);
2492 write_unlock_bh(&idev->lock);
2493
2494 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2495 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2496 in6_ifa_put(ifa);
2497
2498 write_lock_bh(&idev->lock);
2499 }
2500 write_unlock_bh(&idev->lock);
2501
2502 /* Step 5: Discard multicast list */
2503
2504 if (how == 1)
2505 ipv6_mc_destroy_dev(idev);
2506 else
2507 ipv6_mc_down(idev);
2508
2509 idev->tstamp = jiffies;
2510
2511 /* Shot the device (if unregistered) */
2512
2513 if (how == 1) {
2514 #ifdef CONFIG_SYSCTL
2515 addrconf_sysctl_unregister(&idev->cnf);
2516 neigh_sysctl_unregister(idev->nd_parms);
2517 #endif
2518 neigh_parms_release(&nd_tbl, idev->nd_parms);
2519 neigh_ifdown(&nd_tbl, dev);
2520 in6_dev_put(idev);
2521 }
2522 return 0;
2523 }
2524
2525 static void addrconf_rs_timer(unsigned long data)
2526 {
2527 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2528
2529 if (ifp->idev->cnf.forwarding)
2530 goto out;
2531
2532 if (ifp->idev->if_flags & IF_RA_RCVD) {
2533 /*
2534 * Announcement received after solicitation
2535 * was sent
2536 */
2537 goto out;
2538 }
2539
2540 spin_lock(&ifp->lock);
2541 if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2542 struct in6_addr all_routers;
2543
2544 /* The wait after the last probe can be shorter */
2545 addrconf_mod_timer(ifp, AC_RS,
2546 (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2547 ifp->idev->cnf.rtr_solicit_delay :
2548 ifp->idev->cnf.rtr_solicit_interval);
2549 spin_unlock(&ifp->lock);
2550
2551 ipv6_addr_all_routers(&all_routers);
2552
2553 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2554 } else {
2555 spin_unlock(&ifp->lock);
2556 /*
2557 * Note: we do not support deprecated "all on-link"
2558 * assumption any longer.
2559 */
2560 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2561 ifp->idev->dev->name);
2562 }
2563
2564 out:
2565 in6_ifa_put(ifp);
2566 }
2567
2568 /*
2569 * Duplicate Address Detection
2570 */
2571 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2572 {
2573 unsigned long rand_num;
2574 struct inet6_dev *idev = ifp->idev;
2575
2576 if (ifp->flags & IFA_F_OPTIMISTIC)
2577 rand_num = 0;
2578 else
2579 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2580
2581 ifp->probes = idev->cnf.dad_transmits;
2582 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2583 }
2584
2585 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2586 {
2587 struct inet6_dev *idev = ifp->idev;
2588 struct net_device *dev = idev->dev;
2589
2590 addrconf_join_solict(dev, &ifp->addr);
2591
2592 net_srandom(ifp->addr.s6_addr32[3]);
2593
2594 read_lock_bh(&idev->lock);
2595 if (ifp->dead)
2596 goto out;
2597 spin_lock_bh(&ifp->lock);
2598
2599 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2600 !(ifp->flags&IFA_F_TENTATIVE) ||
2601 ifp->flags & IFA_F_NODAD) {
2602 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
2603 spin_unlock_bh(&ifp->lock);
2604 read_unlock_bh(&idev->lock);
2605
2606 addrconf_dad_completed(ifp);
2607 return;
2608 }
2609
2610 if (!(idev->if_flags & IF_READY)) {
2611 spin_unlock_bh(&ifp->lock);
2612 read_unlock_bh(&idev->lock);
2613 /*
2614 * If the defice is not ready:
2615 * - keep it tentative if it is a permanent address.
2616 * - otherwise, kill it.
2617 */
2618 in6_ifa_hold(ifp);
2619 addrconf_dad_stop(ifp);
2620 return;
2621 }
2622
2623 /*
2624 * Optimistic nodes can start receiving
2625 * Frames right away
2626 */
2627 if(ifp->flags & IFA_F_OPTIMISTIC)
2628 ip6_ins_rt(ifp->rt);
2629
2630 addrconf_dad_kick(ifp);
2631 spin_unlock_bh(&ifp->lock);
2632 out:
2633 read_unlock_bh(&idev->lock);
2634 }
2635
2636 static void addrconf_dad_timer(unsigned long data)
2637 {
2638 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2639 struct inet6_dev *idev = ifp->idev;
2640 struct in6_addr unspec;
2641 struct in6_addr mcaddr;
2642
2643 read_lock_bh(&idev->lock);
2644 if (idev->dead) {
2645 read_unlock_bh(&idev->lock);
2646 goto out;
2647 }
2648 spin_lock_bh(&ifp->lock);
2649 if (ifp->probes == 0) {
2650 /*
2651 * DAD was successful
2652 */
2653
2654 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
2655 spin_unlock_bh(&ifp->lock);
2656 read_unlock_bh(&idev->lock);
2657
2658 addrconf_dad_completed(ifp);
2659
2660 goto out;
2661 }
2662
2663 ifp->probes--;
2664 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2665 spin_unlock_bh(&ifp->lock);
2666 read_unlock_bh(&idev->lock);
2667
2668 /* send a neighbour solicitation for our addr */
2669 memset(&unspec, 0, sizeof(unspec));
2670 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2671 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec);
2672 out:
2673 in6_ifa_put(ifp);
2674 }
2675
2676 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2677 {
2678 struct net_device * dev = ifp->idev->dev;
2679
2680 /*
2681 * Configure the address for reception. Now it is valid.
2682 */
2683
2684 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2685
2686 /* If added prefix is link local and forwarding is off,
2687 start sending router solicitations.
2688 */
2689
2690 if (ifp->idev->cnf.forwarding == 0 &&
2691 ifp->idev->cnf.rtr_solicits > 0 &&
2692 (dev->flags&IFF_LOOPBACK) == 0 &&
2693 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2694 struct in6_addr all_routers;
2695
2696 ipv6_addr_all_routers(&all_routers);
2697
2698 /*
2699 * If a host as already performed a random delay
2700 * [...] as part of DAD [...] there is no need
2701 * to delay again before sending the first RS
2702 */
2703 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2704
2705 spin_lock_bh(&ifp->lock);
2706 ifp->probes = 1;
2707 ifp->idev->if_flags |= IF_RS_SENT;
2708 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2709 spin_unlock_bh(&ifp->lock);
2710 }
2711 }
2712
2713 static void addrconf_dad_run(struct inet6_dev *idev) {
2714 struct inet6_ifaddr *ifp;
2715
2716 read_lock_bh(&idev->lock);
2717 for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2718 spin_lock_bh(&ifp->lock);
2719 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2720 spin_unlock_bh(&ifp->lock);
2721 continue;
2722 }
2723 spin_unlock_bh(&ifp->lock);
2724 addrconf_dad_kick(ifp);
2725 }
2726 read_unlock_bh(&idev->lock);
2727 }
2728
2729 #ifdef CONFIG_PROC_FS
2730 struct if6_iter_state {
2731 int bucket;
2732 };
2733
2734 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2735 {
2736 struct inet6_ifaddr *ifa = NULL;
2737 struct if6_iter_state *state = seq->private;
2738
2739 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2740 ifa = inet6_addr_lst[state->bucket];
2741 if (ifa)
2742 break;
2743 }
2744 return ifa;
2745 }
2746
2747 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2748 {
2749 struct if6_iter_state *state = seq->private;
2750
2751 ifa = ifa->lst_next;
2752 try_again:
2753 if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2754 ifa = inet6_addr_lst[state->bucket];
2755 goto try_again;
2756 }
2757 return ifa;
2758 }
2759
2760 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2761 {
2762 struct inet6_ifaddr *ifa = if6_get_first(seq);
2763
2764 if (ifa)
2765 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2766 --pos;
2767 return pos ? NULL : ifa;
2768 }
2769
2770 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2771 {
2772 read_lock_bh(&addrconf_hash_lock);
2773 return if6_get_idx(seq, *pos);
2774 }
2775
2776 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2777 {
2778 struct inet6_ifaddr *ifa;
2779
2780 ifa = if6_get_next(seq, v);
2781 ++*pos;
2782 return ifa;
2783 }
2784
2785 static void if6_seq_stop(struct seq_file *seq, void *v)
2786 {
2787 read_unlock_bh(&addrconf_hash_lock);
2788 }
2789
2790 static int if6_seq_show(struct seq_file *seq, void *v)
2791 {
2792 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2793 seq_printf(seq,
2794 NIP6_SEQFMT " %02x %02x %02x %02x %8s\n",
2795 NIP6(ifp->addr),
2796 ifp->idev->dev->ifindex,
2797 ifp->prefix_len,
2798 ifp->scope,
2799 ifp->flags,
2800 ifp->idev->dev->name);
2801 return 0;
2802 }
2803
2804 static const struct seq_operations if6_seq_ops = {
2805 .start = if6_seq_start,
2806 .next = if6_seq_next,
2807 .show = if6_seq_show,
2808 .stop = if6_seq_stop,
2809 };
2810
2811 static int if6_seq_open(struct inode *inode, struct file *file)
2812 {
2813 return seq_open_private(file, &if6_seq_ops,
2814 sizeof(struct if6_iter_state));
2815 }
2816
2817 static const struct file_operations if6_fops = {
2818 .owner = THIS_MODULE,
2819 .open = if6_seq_open,
2820 .read = seq_read,
2821 .llseek = seq_lseek,
2822 .release = seq_release_private,
2823 };
2824
2825 int __init if6_proc_init(void)
2826 {
2827 if (!proc_net_fops_create(&init_net, "if_inet6", S_IRUGO, &if6_fops))
2828 return -ENOMEM;
2829 return 0;
2830 }
2831
2832 void if6_proc_exit(void)
2833 {
2834 proc_net_remove(&init_net, "if_inet6");
2835 }
2836 #endif /* CONFIG_PROC_FS */
2837
2838 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
2839 /* Check if address is a home address configured on any interface. */
2840 int ipv6_chk_home_addr(struct in6_addr *addr)
2841 {
2842 int ret = 0;
2843 struct inet6_ifaddr * ifp;
2844 u8 hash = ipv6_addr_hash(addr);
2845 read_lock_bh(&addrconf_hash_lock);
2846 for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) {
2847 if (ipv6_addr_cmp(&ifp->addr, addr) == 0 &&
2848 (ifp->flags & IFA_F_HOMEADDRESS)) {
2849 ret = 1;
2850 break;
2851 }
2852 }
2853 read_unlock_bh(&addrconf_hash_lock);
2854 return ret;
2855 }
2856 #endif
2857
2858 /*
2859 * Periodic address status verification
2860 */
2861
2862 static void addrconf_verify(unsigned long foo)
2863 {
2864 struct inet6_ifaddr *ifp;
2865 unsigned long now, next;
2866 int i;
2867
2868 spin_lock_bh(&addrconf_verify_lock);
2869 now = jiffies;
2870 next = now + ADDR_CHECK_FREQUENCY;
2871
2872 del_timer(&addr_chk_timer);
2873
2874 for (i=0; i < IN6_ADDR_HSIZE; i++) {
2875
2876 restart:
2877 read_lock(&addrconf_hash_lock);
2878 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
2879 unsigned long age;
2880 #ifdef CONFIG_IPV6_PRIVACY
2881 unsigned long regen_advance;
2882 #endif
2883
2884 if (ifp->flags & IFA_F_PERMANENT)
2885 continue;
2886
2887 spin_lock(&ifp->lock);
2888 age = (now - ifp->tstamp) / HZ;
2889
2890 #ifdef CONFIG_IPV6_PRIVACY
2891 regen_advance = ifp->idev->cnf.regen_max_retry *
2892 ifp->idev->cnf.dad_transmits *
2893 ifp->idev->nd_parms->retrans_time / HZ;
2894 #endif
2895
2896 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
2897 age >= ifp->valid_lft) {
2898 spin_unlock(&ifp->lock);
2899 in6_ifa_hold(ifp);
2900 read_unlock(&addrconf_hash_lock);
2901 ipv6_del_addr(ifp);
2902 goto restart;
2903 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
2904 spin_unlock(&ifp->lock);
2905 continue;
2906 } else if (age >= ifp->prefered_lft) {
2907 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
2908 int deprecate = 0;
2909
2910 if (!(ifp->flags&IFA_F_DEPRECATED)) {
2911 deprecate = 1;
2912 ifp->flags |= IFA_F_DEPRECATED;
2913 }
2914
2915 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
2916 next = ifp->tstamp + ifp->valid_lft * HZ;
2917
2918 spin_unlock(&ifp->lock);
2919
2920 if (deprecate) {
2921 in6_ifa_hold(ifp);
2922 read_unlock(&addrconf_hash_lock);
2923
2924 ipv6_ifa_notify(0, ifp);
2925 in6_ifa_put(ifp);
2926 goto restart;
2927 }
2928 #ifdef CONFIG_IPV6_PRIVACY
2929 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
2930 !(ifp->flags&IFA_F_TENTATIVE)) {
2931 if (age >= ifp->prefered_lft - regen_advance) {
2932 struct inet6_ifaddr *ifpub = ifp->ifpub;
2933 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2934 next = ifp->tstamp + ifp->prefered_lft * HZ;
2935 if (!ifp->regen_count && ifpub) {
2936 ifp->regen_count++;
2937 in6_ifa_hold(ifp);
2938 in6_ifa_hold(ifpub);
2939 spin_unlock(&ifp->lock);
2940 read_unlock(&addrconf_hash_lock);
2941 spin_lock(&ifpub->lock);
2942 ifpub->regen_count = 0;
2943 spin_unlock(&ifpub->lock);
2944 ipv6_create_tempaddr(ifpub, ifp);
2945 in6_ifa_put(ifpub);
2946 in6_ifa_put(ifp);
2947 goto restart;
2948 }
2949 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
2950 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
2951 spin_unlock(&ifp->lock);
2952 #endif
2953 } else {
2954 /* ifp->prefered_lft <= ifp->valid_lft */
2955 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2956 next = ifp->tstamp + ifp->prefered_lft * HZ;
2957 spin_unlock(&ifp->lock);
2958 }
2959 }
2960 read_unlock(&addrconf_hash_lock);
2961 }
2962
2963 addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
2964 add_timer(&addr_chk_timer);
2965 spin_unlock_bh(&addrconf_verify_lock);
2966 }
2967
2968 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
2969 {
2970 struct in6_addr *pfx = NULL;
2971
2972 if (addr)
2973 pfx = nla_data(addr);
2974
2975 if (local) {
2976 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
2977 pfx = NULL;
2978 else
2979 pfx = nla_data(local);
2980 }
2981
2982 return pfx;
2983 }
2984
2985 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
2986 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
2987 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
2988 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
2989 };
2990
2991 static int
2992 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
2993 {
2994 struct net *net = skb->sk->sk_net;
2995 struct ifaddrmsg *ifm;
2996 struct nlattr *tb[IFA_MAX+1];
2997 struct in6_addr *pfx;
2998 int err;
2999
3000 if (net != &init_net)
3001 return -EINVAL;
3002
3003 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3004 if (err < 0)
3005 return err;
3006
3007 ifm = nlmsg_data(nlh);
3008 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3009 if (pfx == NULL)
3010 return -EINVAL;
3011
3012 return inet6_addr_del(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3013 }
3014
3015 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3016 u32 prefered_lft, u32 valid_lft)
3017 {
3018 u32 flags = RTF_EXPIRES;
3019
3020 if (!valid_lft || (prefered_lft > valid_lft))
3021 return -EINVAL;
3022
3023 if (valid_lft == INFINITY_LIFE_TIME) {
3024 ifa_flags |= IFA_F_PERMANENT;
3025 flags = 0;
3026 } else if (valid_lft >= 0x7FFFFFFF/HZ)
3027 valid_lft = 0x7FFFFFFF/HZ;
3028
3029 if (prefered_lft == 0)
3030 ifa_flags |= IFA_F_DEPRECATED;
3031 else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
3032 (prefered_lft != INFINITY_LIFE_TIME))
3033 prefered_lft = 0x7FFFFFFF/HZ;
3034
3035 spin_lock_bh(&ifp->lock);
3036 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3037 ifp->tstamp = jiffies;
3038 ifp->valid_lft = valid_lft;
3039 ifp->prefered_lft = prefered_lft;
3040
3041 spin_unlock_bh(&ifp->lock);
3042 if (!(ifp->flags&IFA_F_TENTATIVE))
3043 ipv6_ifa_notify(0, ifp);
3044
3045 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3046 jiffies_to_clock_t(valid_lft * HZ), flags);
3047 addrconf_verify(0);
3048
3049 return 0;
3050 }
3051
3052 static int
3053 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3054 {
3055 struct net *net = skb->sk->sk_net;
3056 struct ifaddrmsg *ifm;
3057 struct nlattr *tb[IFA_MAX+1];
3058 struct in6_addr *pfx;
3059 struct inet6_ifaddr *ifa;
3060 struct net_device *dev;
3061 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3062 u8 ifa_flags;
3063 int err;
3064
3065 if (net != &init_net)
3066 return -EINVAL;
3067
3068 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3069 if (err < 0)
3070 return err;
3071
3072 ifm = nlmsg_data(nlh);
3073 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3074 if (pfx == NULL)
3075 return -EINVAL;
3076
3077 if (tb[IFA_CACHEINFO]) {
3078 struct ifa_cacheinfo *ci;
3079
3080 ci = nla_data(tb[IFA_CACHEINFO]);
3081 valid_lft = ci->ifa_valid;
3082 preferred_lft = ci->ifa_prefered;
3083 } else {
3084 preferred_lft = INFINITY_LIFE_TIME;
3085 valid_lft = INFINITY_LIFE_TIME;
3086 }
3087
3088 dev = __dev_get_by_index(&init_net, ifm->ifa_index);
3089 if (dev == NULL)
3090 return -ENODEV;
3091
3092 /* We ignore other flags so far. */
3093 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3094
3095 ifa = ipv6_get_ifaddr(pfx, dev, 1);
3096 if (ifa == NULL) {
3097 /*
3098 * It would be best to check for !NLM_F_CREATE here but
3099 * userspace alreay relies on not having to provide this.
3100 */
3101 return inet6_addr_add(ifm->ifa_index, pfx, ifm->ifa_prefixlen,
3102 ifa_flags, preferred_lft, valid_lft);
3103 }
3104
3105 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3106 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3107 err = -EEXIST;
3108 else
3109 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3110
3111 in6_ifa_put(ifa);
3112
3113 return err;
3114 }
3115
3116 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3117 u8 scope, int ifindex)
3118 {
3119 struct ifaddrmsg *ifm;
3120
3121 ifm = nlmsg_data(nlh);
3122 ifm->ifa_family = AF_INET6;
3123 ifm->ifa_prefixlen = prefixlen;
3124 ifm->ifa_flags = flags;
3125 ifm->ifa_scope = scope;
3126 ifm->ifa_index = ifindex;
3127 }
3128
3129 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3130 unsigned long tstamp, u32 preferred, u32 valid)
3131 {
3132 struct ifa_cacheinfo ci;
3133
3134 ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3135 + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3136 ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3137 + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3138 ci.ifa_prefered = preferred;
3139 ci.ifa_valid = valid;
3140
3141 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3142 }
3143
3144 static inline int rt_scope(int ifa_scope)
3145 {
3146 if (ifa_scope & IFA_HOST)
3147 return RT_SCOPE_HOST;
3148 else if (ifa_scope & IFA_LINK)
3149 return RT_SCOPE_LINK;
3150 else if (ifa_scope & IFA_SITE)
3151 return RT_SCOPE_SITE;
3152 else
3153 return RT_SCOPE_UNIVERSE;
3154 }
3155
3156 static inline int inet6_ifaddr_msgsize(void)
3157 {
3158 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3159 + nla_total_size(16) /* IFA_ADDRESS */
3160 + nla_total_size(sizeof(struct ifa_cacheinfo));
3161 }
3162
3163 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3164 u32 pid, u32 seq, int event, unsigned int flags)
3165 {
3166 struct nlmsghdr *nlh;
3167 u32 preferred, valid;
3168
3169 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3170 if (nlh == NULL)
3171 return -EMSGSIZE;
3172
3173 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3174 ifa->idev->dev->ifindex);
3175
3176 if (!(ifa->flags&IFA_F_PERMANENT)) {
3177 preferred = ifa->prefered_lft;
3178 valid = ifa->valid_lft;
3179 if (preferred != INFINITY_LIFE_TIME) {
3180 long tval = (jiffies - ifa->tstamp)/HZ;
3181 preferred -= tval;
3182 if (valid != INFINITY_LIFE_TIME)
3183 valid -= tval;
3184 }
3185 } else {
3186 preferred = INFINITY_LIFE_TIME;
3187 valid = INFINITY_LIFE_TIME;
3188 }
3189
3190 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3191 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3192 nlmsg_cancel(skb, nlh);
3193 return -EMSGSIZE;
3194 }
3195
3196 return nlmsg_end(skb, nlh);
3197 }
3198
3199 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3200 u32 pid, u32 seq, int event, u16 flags)
3201 {
3202 struct nlmsghdr *nlh;
3203 u8 scope = RT_SCOPE_UNIVERSE;
3204 int ifindex = ifmca->idev->dev->ifindex;
3205
3206 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3207 scope = RT_SCOPE_SITE;
3208
3209 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3210 if (nlh == NULL)
3211 return -EMSGSIZE;
3212
3213 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3214 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3215 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3216 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3217 nlmsg_cancel(skb, nlh);
3218 return -EMSGSIZE;
3219 }
3220
3221 return nlmsg_end(skb, nlh);
3222 }
3223
3224 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3225 u32 pid, u32 seq, int event, unsigned int flags)
3226 {
3227 struct nlmsghdr *nlh;
3228 u8 scope = RT_SCOPE_UNIVERSE;
3229 int ifindex = ifaca->aca_idev->dev->ifindex;
3230
3231 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3232 scope = RT_SCOPE_SITE;
3233
3234 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3235 if (nlh == NULL)
3236 return -EMSGSIZE;
3237
3238 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3239 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3240 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3241 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3242 nlmsg_cancel(skb, nlh);
3243 return -EMSGSIZE;
3244 }
3245
3246 return nlmsg_end(skb, nlh);
3247 }
3248
3249 enum addr_type_t
3250 {
3251 UNICAST_ADDR,
3252 MULTICAST_ADDR,
3253 ANYCAST_ADDR,
3254 };
3255
3256 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3257 enum addr_type_t type)
3258 {
3259 int idx, ip_idx;
3260 int s_idx, s_ip_idx;
3261 int err = 1;
3262 struct net_device *dev;
3263 struct inet6_dev *idev = NULL;
3264 struct inet6_ifaddr *ifa;
3265 struct ifmcaddr6 *ifmca;
3266 struct ifacaddr6 *ifaca;
3267
3268 s_idx = cb->args[0];
3269 s_ip_idx = ip_idx = cb->args[1];
3270
3271 idx = 0;
3272 for_each_netdev(&init_net, dev) {
3273 if (idx < s_idx)
3274 goto cont;
3275 if (idx > s_idx)
3276 s_ip_idx = 0;
3277 ip_idx = 0;
3278 if ((idev = in6_dev_get(dev)) == NULL)
3279 goto cont;
3280 read_lock_bh(&idev->lock);
3281 switch (type) {
3282 case UNICAST_ADDR:
3283 /* unicast address incl. temp addr */
3284 for (ifa = idev->addr_list; ifa;
3285 ifa = ifa->if_next, ip_idx++) {
3286 if (ip_idx < s_ip_idx)
3287 continue;
3288 if ((err = inet6_fill_ifaddr(skb, ifa,
3289 NETLINK_CB(cb->skb).pid,
3290 cb->nlh->nlmsg_seq, RTM_NEWADDR,
3291 NLM_F_MULTI)) <= 0)
3292 goto done;
3293 }
3294 break;
3295 case MULTICAST_ADDR:
3296 /* multicast address */
3297 for (ifmca = idev->mc_list; ifmca;
3298 ifmca = ifmca->next, ip_idx++) {
3299 if (ip_idx < s_ip_idx)
3300 continue;
3301 if ((err = inet6_fill_ifmcaddr(skb, ifmca,
3302 NETLINK_CB(cb->skb).pid,
3303 cb->nlh->nlmsg_seq, RTM_GETMULTICAST,
3304 NLM_F_MULTI)) <= 0)
3305 goto done;
3306 }
3307 break;
3308 case ANYCAST_ADDR:
3309 /* anycast address */
3310 for (ifaca = idev->ac_list; ifaca;
3311 ifaca = ifaca->aca_next, ip_idx++) {
3312 if (ip_idx < s_ip_idx)
3313 continue;
3314 if ((err = inet6_fill_ifacaddr(skb, ifaca,
3315 NETLINK_CB(cb->skb).pid,
3316 cb->nlh->nlmsg_seq, RTM_GETANYCAST,
3317 NLM_F_MULTI)) <= 0)
3318 goto done;
3319 }
3320 break;
3321 default:
3322 break;
3323 }
3324 read_unlock_bh(&idev->lock);
3325 in6_dev_put(idev);
3326 cont:
3327 idx++;
3328 }
3329 done:
3330 if (err <= 0) {
3331 read_unlock_bh(&idev->lock);
3332 in6_dev_put(idev);
3333 }
3334 cb->args[0] = idx;
3335 cb->args[1] = ip_idx;
3336 return skb->len;
3337 }
3338
3339 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3340 {
3341 struct net *net = skb->sk->sk_net;
3342 enum addr_type_t type = UNICAST_ADDR;
3343
3344 if (net != &init_net)
3345 return 0;
3346
3347 return inet6_dump_addr(skb, cb, type);
3348 }
3349
3350 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3351 {
3352 struct net *net = skb->sk->sk_net;
3353 enum addr_type_t type = MULTICAST_ADDR;
3354
3355 if (net != &init_net)
3356 return 0;
3357
3358 return inet6_dump_addr(skb, cb, type);
3359 }
3360
3361
3362 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3363 {
3364 struct net *net = skb->sk->sk_net;
3365 enum addr_type_t type = ANYCAST_ADDR;
3366
3367 if (net != &init_net)
3368 return 0;
3369
3370 return inet6_dump_addr(skb, cb, type);
3371 }
3372
3373 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3374 void *arg)
3375 {
3376 struct net *net = in_skb->sk->sk_net;
3377 struct ifaddrmsg *ifm;
3378 struct nlattr *tb[IFA_MAX+1];
3379 struct in6_addr *addr = NULL;
3380 struct net_device *dev = NULL;
3381 struct inet6_ifaddr *ifa;
3382 struct sk_buff *skb;
3383 int err;
3384
3385 if (net != &init_net)
3386 return -EINVAL;
3387
3388 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3389 if (err < 0)
3390 goto errout;
3391
3392 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3393 if (addr == NULL) {
3394 err = -EINVAL;
3395 goto errout;
3396 }
3397
3398 ifm = nlmsg_data(nlh);
3399 if (ifm->ifa_index)
3400 dev = __dev_get_by_index(&init_net, ifm->ifa_index);
3401
3402 if ((ifa = ipv6_get_ifaddr(addr, dev, 1)) == NULL) {
3403 err = -EADDRNOTAVAIL;
3404 goto errout;
3405 }
3406
3407 if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) {
3408 err = -ENOBUFS;
3409 goto errout_ifa;
3410 }
3411
3412 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3413 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3414 if (err < 0) {
3415 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3416 WARN_ON(err == -EMSGSIZE);
3417 kfree_skb(skb);
3418 goto errout_ifa;
3419 }
3420 err = rtnl_unicast(skb, &init_net, NETLINK_CB(in_skb).pid);
3421 errout_ifa:
3422 in6_ifa_put(ifa);
3423 errout:
3424 return err;
3425 }
3426
3427 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3428 {
3429 struct sk_buff *skb;
3430 int err = -ENOBUFS;
3431
3432 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3433 if (skb == NULL)
3434 goto errout;
3435
3436 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3437 if (err < 0) {
3438 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3439 WARN_ON(err == -EMSGSIZE);
3440 kfree_skb(skb);
3441 goto errout;
3442 }
3443 err = rtnl_notify(skb, &init_net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3444 errout:
3445 if (err < 0)
3446 rtnl_set_sk_err(&init_net, RTNLGRP_IPV6_IFADDR, err);
3447 }
3448
3449 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3450 __s32 *array, int bytes)
3451 {
3452 BUG_ON(bytes < (DEVCONF_MAX * 4));
3453
3454 memset(array, 0, bytes);
3455 array[DEVCONF_FORWARDING] = cnf->forwarding;
3456 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3457 array[DEVCONF_MTU6] = cnf->mtu6;
3458 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3459 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3460 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3461 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3462 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3463 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3464 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3465 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3466 #ifdef CONFIG_IPV6_PRIVACY
3467 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3468 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3469 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3470 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3471 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3472 #endif
3473 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3474 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3475 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3476 #ifdef CONFIG_IPV6_ROUTER_PREF
3477 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3478 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
3479 #ifdef CONFIG_IPV6_ROUTE_INFO
3480 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3481 #endif
3482 #endif
3483 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3484 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3485 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3486 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3487 #endif
3488 }
3489
3490 static inline size_t inet6_if_nlmsg_size(void)
3491 {
3492 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3493 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3494 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3495 + nla_total_size(4) /* IFLA_MTU */
3496 + nla_total_size(4) /* IFLA_LINK */
3497 + nla_total_size( /* IFLA_PROTINFO */
3498 nla_total_size(4) /* IFLA_INET6_FLAGS */
3499 + nla_total_size(sizeof(struct ifla_cacheinfo))
3500 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3501 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3502 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
3503 );
3504 }
3505
3506 static inline void __snmp6_fill_stats(u64 *stats, void **mib, int items,
3507 int bytes)
3508 {
3509 int i;
3510 int pad = bytes - sizeof(u64) * items;
3511 BUG_ON(pad < 0);
3512
3513 /* Use put_unaligned() because stats may not be aligned for u64. */
3514 put_unaligned(items, &stats[0]);
3515 for (i = 1; i < items; i++)
3516 put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3517
3518 memset(&stats[items], 0, pad);
3519 }
3520
3521 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3522 int bytes)
3523 {
3524 switch(attrtype) {
3525 case IFLA_INET6_STATS:
3526 __snmp6_fill_stats(stats, (void **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes);
3527 break;
3528 case IFLA_INET6_ICMP6STATS:
3529 __snmp6_fill_stats(stats, (void **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
3530 break;
3531 }
3532 }
3533
3534 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3535 u32 pid, u32 seq, int event, unsigned int flags)
3536 {
3537 struct net_device *dev = idev->dev;
3538 struct nlattr *nla;
3539 struct ifinfomsg *hdr;
3540 struct nlmsghdr *nlh;
3541 void *protoinfo;
3542 struct ifla_cacheinfo ci;
3543
3544 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3545 if (nlh == NULL)
3546 return -EMSGSIZE;
3547
3548 hdr = nlmsg_data(nlh);
3549 hdr->ifi_family = AF_INET6;
3550 hdr->__ifi_pad = 0;
3551 hdr->ifi_type = dev->type;
3552 hdr->ifi_index = dev->ifindex;
3553 hdr->ifi_flags = dev_get_flags(dev);
3554 hdr->ifi_change = 0;
3555
3556 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
3557
3558 if (dev->addr_len)
3559 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3560
3561 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
3562 if (dev->ifindex != dev->iflink)
3563 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
3564
3565 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3566 if (protoinfo == NULL)
3567 goto nla_put_failure;
3568
3569 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
3570
3571 ci.max_reasm_len = IPV6_MAXPLEN;
3572 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3573 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3574 ci.reachable_time = idev->nd_parms->reachable_time;
3575 ci.retrans_time = idev->nd_parms->retrans_time;
3576 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3577
3578 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3579 if (nla == NULL)
3580 goto nla_put_failure;
3581 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
3582
3583 /* XXX - MC not implemented */
3584
3585 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3586 if (nla == NULL)
3587 goto nla_put_failure;
3588 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3589
3590 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3591 if (nla == NULL)
3592 goto nla_put_failure;
3593 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
3594
3595 nla_nest_end(skb, protoinfo);
3596 return nlmsg_end(skb, nlh);
3597
3598 nla_put_failure:
3599 nlmsg_cancel(skb, nlh);
3600 return -EMSGSIZE;
3601 }
3602
3603 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3604 {
3605 struct net *net = skb->sk->sk_net;
3606 int idx, err;
3607 int s_idx = cb->args[0];
3608 struct net_device *dev;
3609 struct inet6_dev *idev;
3610
3611 if (net != &init_net)
3612 return 0;
3613
3614 read_lock(&dev_base_lock);
3615 idx = 0;
3616 for_each_netdev(&init_net, dev) {
3617 if (idx < s_idx)
3618 goto cont;
3619 if ((idev = in6_dev_get(dev)) == NULL)
3620 goto cont;
3621 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
3622 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
3623 in6_dev_put(idev);
3624 if (err <= 0)
3625 break;
3626 cont:
3627 idx++;
3628 }
3629 read_unlock(&dev_base_lock);
3630 cb->args[0] = idx;
3631
3632 return skb->len;
3633 }
3634
3635 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3636 {
3637 struct sk_buff *skb;
3638 int err = -ENOBUFS;
3639
3640 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
3641 if (skb == NULL)
3642 goto errout;
3643
3644 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
3645 if (err < 0) {
3646 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3647 WARN_ON(err == -EMSGSIZE);
3648 kfree_skb(skb);
3649 goto errout;
3650 }
3651 err = rtnl_notify(skb, &init_net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3652 errout:
3653 if (err < 0)
3654 rtnl_set_sk_err(&init_net, RTNLGRP_IPV6_IFADDR, err);
3655 }
3656
3657 static inline size_t inet6_prefix_nlmsg_size(void)
3658 {
3659 return NLMSG_ALIGN(sizeof(struct prefixmsg))
3660 + nla_total_size(sizeof(struct in6_addr))
3661 + nla_total_size(sizeof(struct prefix_cacheinfo));
3662 }
3663
3664 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
3665 struct prefix_info *pinfo, u32 pid, u32 seq,
3666 int event, unsigned int flags)
3667 {
3668 struct prefixmsg *pmsg;
3669 struct nlmsghdr *nlh;
3670 struct prefix_cacheinfo ci;
3671
3672 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
3673 if (nlh == NULL)
3674 return -EMSGSIZE;
3675
3676 pmsg = nlmsg_data(nlh);
3677 pmsg->prefix_family = AF_INET6;
3678 pmsg->prefix_pad1 = 0;
3679 pmsg->prefix_pad2 = 0;
3680 pmsg->prefix_ifindex = idev->dev->ifindex;
3681 pmsg->prefix_len = pinfo->prefix_len;
3682 pmsg->prefix_type = pinfo->type;
3683 pmsg->prefix_pad3 = 0;
3684 pmsg->prefix_flags = 0;
3685 if (pinfo->onlink)
3686 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3687 if (pinfo->autoconf)
3688 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3689
3690 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
3691
3692 ci.preferred_time = ntohl(pinfo->prefered);
3693 ci.valid_time = ntohl(pinfo->valid);
3694 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
3695
3696 return nlmsg_end(skb, nlh);
3697
3698 nla_put_failure:
3699 nlmsg_cancel(skb, nlh);
3700 return -EMSGSIZE;
3701 }
3702
3703 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
3704 struct prefix_info *pinfo)
3705 {
3706 struct sk_buff *skb;
3707 int err = -ENOBUFS;
3708
3709 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
3710 if (skb == NULL)
3711 goto errout;
3712
3713 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
3714 if (err < 0) {
3715 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
3716 WARN_ON(err == -EMSGSIZE);
3717 kfree_skb(skb);
3718 goto errout;
3719 }
3720 err = rtnl_notify(skb, &init_net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
3721 errout:
3722 if (err < 0)
3723 rtnl_set_sk_err(&init_net, RTNLGRP_IPV6_PREFIX, err);
3724 }
3725
3726 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3727 {
3728 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3729
3730 switch (event) {
3731 case RTM_NEWADDR:
3732 /*
3733 * If the address was optimistic
3734 * we inserted the route at the start of
3735 * our DAD process, so we don't need
3736 * to do it again
3737 */
3738 if (!(ifp->rt->rt6i_node))
3739 ip6_ins_rt(ifp->rt);
3740 if (ifp->idev->cnf.forwarding)
3741 addrconf_join_anycast(ifp);
3742 break;
3743 case RTM_DELADDR:
3744 if (ifp->idev->cnf.forwarding)
3745 addrconf_leave_anycast(ifp);
3746 addrconf_leave_solict(ifp->idev, &ifp->addr);
3747 dst_hold(&ifp->rt->u.dst);
3748 if (ip6_del_rt(ifp->rt))
3749 dst_free(&ifp->rt->u.dst);
3750 break;
3751 }
3752 }
3753
3754 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3755 {
3756 rcu_read_lock_bh();
3757 if (likely(ifp->idev->dead == 0))
3758 __ipv6_ifa_notify(event, ifp);
3759 rcu_read_unlock_bh();
3760 }
3761
3762 #ifdef CONFIG_SYSCTL
3763
3764 static
3765 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3766 void __user *buffer, size_t *lenp, loff_t *ppos)
3767 {
3768 int *valp = ctl->data;
3769 int val = *valp;
3770 int ret;
3771
3772 ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3773
3774 if (write && valp != &ipv6_devconf_dflt.forwarding) {
3775 if (valp != &ipv6_devconf.forwarding) {
3776 if ((!*valp) ^ (!val)) {
3777 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
3778 if (idev == NULL)
3779 return ret;
3780 dev_forward_change(idev);
3781 }
3782 } else {
3783 ipv6_devconf_dflt.forwarding = ipv6_devconf.forwarding;
3784 addrconf_forward_change();
3785 }
3786 if (*valp)
3787 rt6_purge_dflt_routers();
3788 }
3789
3790 return ret;
3791 }
3792
3793 static int addrconf_sysctl_forward_strategy(ctl_table *table,
3794 int __user *name, int nlen,
3795 void __user *oldval,
3796 size_t __user *oldlenp,
3797 void __user *newval, size_t newlen)
3798 {
3799 int *valp = table->data;
3800 int new;
3801
3802 if (!newval || !newlen)
3803 return 0;
3804 if (newlen != sizeof(int))
3805 return -EINVAL;
3806 if (get_user(new, (int __user *)newval))
3807 return -EFAULT;
3808 if (new == *valp)
3809 return 0;
3810 if (oldval && oldlenp) {
3811 size_t len;
3812 if (get_user(len, oldlenp))
3813 return -EFAULT;
3814 if (len) {
3815 if (len > table->maxlen)
3816 len = table->maxlen;
3817 if (copy_to_user(oldval, valp, len))
3818 return -EFAULT;
3819 if (put_user(len, oldlenp))
3820 return -EFAULT;
3821 }
3822 }
3823
3824 if (valp != &ipv6_devconf_dflt.forwarding) {
3825 if (valp != &ipv6_devconf.forwarding) {
3826 struct inet6_dev *idev = (struct inet6_dev *)table->extra1;
3827 int changed;
3828 if (unlikely(idev == NULL))
3829 return -ENODEV;
3830 changed = (!*valp) ^ (!new);
3831 *valp = new;
3832 if (changed)
3833 dev_forward_change(idev);
3834 } else {
3835 *valp = new;
3836 addrconf_forward_change();
3837 }
3838
3839 if (*valp)
3840 rt6_purge_dflt_routers();
3841 } else
3842 *valp = new;
3843
3844 return 1;
3845 }
3846
3847 static struct addrconf_sysctl_table
3848 {
3849 struct ctl_table_header *sysctl_header;
3850 ctl_table addrconf_vars[__NET_IPV6_MAX];
3851 char *dev_name;
3852 } addrconf_sysctl __read_mostly = {
3853 .sysctl_header = NULL,
3854 .addrconf_vars = {
3855 {
3856 .ctl_name = NET_IPV6_FORWARDING,
3857 .procname = "forwarding",
3858 .data = &ipv6_devconf.forwarding,
3859 .maxlen = sizeof(int),
3860 .mode = 0644,
3861 .proc_handler = &addrconf_sysctl_forward,
3862 .strategy = &addrconf_sysctl_forward_strategy,
3863 },
3864 {
3865 .ctl_name = NET_IPV6_HOP_LIMIT,
3866 .procname = "hop_limit",
3867 .data = &ipv6_devconf.hop_limit,
3868 .maxlen = sizeof(int),
3869 .mode = 0644,
3870 .proc_handler = proc_dointvec,
3871 },
3872 {
3873 .ctl_name = NET_IPV6_MTU,
3874 .procname = "mtu",
3875 .data = &ipv6_devconf.mtu6,
3876 .maxlen = sizeof(int),
3877 .mode = 0644,
3878 .proc_handler = &proc_dointvec,
3879 },
3880 {
3881 .ctl_name = NET_IPV6_ACCEPT_RA,
3882 .procname = "accept_ra",
3883 .data = &ipv6_devconf.accept_ra,
3884 .maxlen = sizeof(int),
3885 .mode = 0644,
3886 .proc_handler = &proc_dointvec,
3887 },
3888 {
3889 .ctl_name = NET_IPV6_ACCEPT_REDIRECTS,
3890 .procname = "accept_redirects",
3891 .data = &ipv6_devconf.accept_redirects,
3892 .maxlen = sizeof(int),
3893 .mode = 0644,
3894 .proc_handler = &proc_dointvec,
3895 },
3896 {
3897 .ctl_name = NET_IPV6_AUTOCONF,
3898 .procname = "autoconf",
3899 .data = &ipv6_devconf.autoconf,
3900 .maxlen = sizeof(int),
3901 .mode = 0644,
3902 .proc_handler = &proc_dointvec,
3903 },
3904 {
3905 .ctl_name = NET_IPV6_DAD_TRANSMITS,
3906 .procname = "dad_transmits",
3907 .data = &ipv6_devconf.dad_transmits,
3908 .maxlen = sizeof(int),
3909 .mode = 0644,
3910 .proc_handler = &proc_dointvec,
3911 },
3912 {
3913 .ctl_name = NET_IPV6_RTR_SOLICITS,
3914 .procname = "router_solicitations",
3915 .data = &ipv6_devconf.rtr_solicits,
3916 .maxlen = sizeof(int),
3917 .mode = 0644,
3918 .proc_handler = &proc_dointvec,
3919 },
3920 {
3921 .ctl_name = NET_IPV6_RTR_SOLICIT_INTERVAL,
3922 .procname = "router_solicitation_interval",
3923 .data = &ipv6_devconf.rtr_solicit_interval,
3924 .maxlen = sizeof(int),
3925 .mode = 0644,
3926 .proc_handler = &proc_dointvec_jiffies,
3927 .strategy = &sysctl_jiffies,
3928 },
3929 {
3930 .ctl_name = NET_IPV6_RTR_SOLICIT_DELAY,
3931 .procname = "router_solicitation_delay",
3932 .data = &ipv6_devconf.rtr_solicit_delay,
3933 .maxlen = sizeof(int),
3934 .mode = 0644,
3935 .proc_handler = &proc_dointvec_jiffies,
3936 .strategy = &sysctl_jiffies,
3937 },
3938 {
3939 .ctl_name = NET_IPV6_FORCE_MLD_VERSION,
3940 .procname = "force_mld_version",
3941 .data = &ipv6_devconf.force_mld_version,
3942 .maxlen = sizeof(int),
3943 .mode = 0644,
3944 .proc_handler = &proc_dointvec,
3945 },
3946 #ifdef CONFIG_IPV6_PRIVACY
3947 {
3948 .ctl_name = NET_IPV6_USE_TEMPADDR,
3949 .procname = "use_tempaddr",
3950 .data = &ipv6_devconf.use_tempaddr,
3951 .maxlen = sizeof(int),
3952 .mode = 0644,
3953 .proc_handler = &proc_dointvec,
3954 },
3955 {
3956 .ctl_name = NET_IPV6_TEMP_VALID_LFT,
3957 .procname = "temp_valid_lft",
3958 .data = &ipv6_devconf.temp_valid_lft,
3959 .maxlen = sizeof(int),
3960 .mode = 0644,
3961 .proc_handler = &proc_dointvec,
3962 },
3963 {
3964 .ctl_name = NET_IPV6_TEMP_PREFERED_LFT,
3965 .procname = "temp_prefered_lft",
3966 .data = &ipv6_devconf.temp_prefered_lft,
3967 .maxlen = sizeof(int),
3968 .mode = 0644,
3969 .proc_handler = &proc_dointvec,
3970 },
3971 {
3972 .ctl_name = NET_IPV6_REGEN_MAX_RETRY,
3973 .procname = "regen_max_retry",
3974 .data = &ipv6_devconf.regen_max_retry,
3975 .maxlen = sizeof(int),
3976 .mode = 0644,
3977 .proc_handler = &proc_dointvec,
3978 },
3979 {
3980 .ctl_name = NET_IPV6_MAX_DESYNC_FACTOR,
3981 .procname = "max_desync_factor",
3982 .data = &ipv6_devconf.max_desync_factor,
3983 .maxlen = sizeof(int),
3984 .mode = 0644,
3985 .proc_handler = &proc_dointvec,
3986 },
3987 #endif
3988 {
3989 .ctl_name = NET_IPV6_MAX_ADDRESSES,
3990 .procname = "max_addresses",
3991 .data = &ipv6_devconf.max_addresses,
3992 .maxlen = sizeof(int),
3993 .mode = 0644,
3994 .proc_handler = &proc_dointvec,
3995 },
3996 {
3997 .ctl_name = NET_IPV6_ACCEPT_RA_DEFRTR,
3998 .procname = "accept_ra_defrtr",
3999 .data = &ipv6_devconf.accept_ra_defrtr,
4000 .maxlen = sizeof(int),
4001 .mode = 0644,
4002 .proc_handler = &proc_dointvec,
4003 },
4004 {
4005 .ctl_name = NET_IPV6_ACCEPT_RA_PINFO,
4006 .procname = "accept_ra_pinfo",
4007 .data = &ipv6_devconf.accept_ra_pinfo,
4008 .maxlen = sizeof(int),
4009 .mode = 0644,
4010 .proc_handler = &proc_dointvec,
4011 },
4012 #ifdef CONFIG_IPV6_ROUTER_PREF
4013 {
4014 .ctl_name = NET_IPV6_ACCEPT_RA_RTR_PREF,
4015 .procname = "accept_ra_rtr_pref",
4016 .data = &ipv6_devconf.accept_ra_rtr_pref,
4017 .maxlen = sizeof(int),
4018 .mode = 0644,
4019 .proc_handler = &proc_dointvec,
4020 },
4021 {
4022 .ctl_name = NET_IPV6_RTR_PROBE_INTERVAL,
4023 .procname = "router_probe_interval",
4024 .data = &ipv6_devconf.rtr_probe_interval,
4025 .maxlen = sizeof(int),
4026 .mode = 0644,
4027 .proc_handler = &proc_dointvec_jiffies,
4028 .strategy = &sysctl_jiffies,
4029 },
4030 #ifdef CONFIG_IPV6_ROUTE_INFO
4031 {
4032 .ctl_name = NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN,
4033 .procname = "accept_ra_rt_info_max_plen",
4034 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4035 .maxlen = sizeof(int),
4036 .mode = 0644,
4037 .proc_handler = &proc_dointvec,
4038 },
4039 #endif
4040 #endif
4041 {
4042 .ctl_name = NET_IPV6_PROXY_NDP,
4043 .procname = "proxy_ndp",
4044 .data = &ipv6_devconf.proxy_ndp,
4045 .maxlen = sizeof(int),
4046 .mode = 0644,
4047 .proc_handler = &proc_dointvec,
4048 },
4049 {
4050 .ctl_name = NET_IPV6_ACCEPT_SOURCE_ROUTE,
4051 .procname = "accept_source_route",
4052 .data = &ipv6_devconf.accept_source_route,
4053 .maxlen = sizeof(int),
4054 .mode = 0644,
4055 .proc_handler = &proc_dointvec,
4056 },
4057 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4058 {
4059 .ctl_name = CTL_UNNUMBERED,
4060 .procname = "optimistic_dad",
4061 .data = &ipv6_devconf.optimistic_dad,
4062 .maxlen = sizeof(int),
4063 .mode = 0644,
4064 .proc_handler = &proc_dointvec,
4065
4066 },
4067 #endif
4068 {
4069 .ctl_name = 0, /* sentinel */
4070 }
4071 },
4072 };
4073
4074 static void __addrconf_sysctl_register(char *dev_name, int ctl_name,
4075 struct inet6_dev *idev, struct ipv6_devconf *p)
4076 {
4077 int i;
4078 struct addrconf_sysctl_table *t;
4079
4080 #define ADDRCONF_CTL_PATH_DEV 3
4081
4082 struct ctl_path addrconf_ctl_path[] = {
4083 { .procname = "net", .ctl_name = CTL_NET, },
4084 { .procname = "ipv6", .ctl_name = NET_IPV6, },
4085 { .procname = "conf", .ctl_name = NET_IPV6_CONF, },
4086 { /* to be set */ },
4087 { },
4088 };
4089
4090
4091 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4092 if (t == NULL)
4093 goto out;
4094
4095 for (i=0; t->addrconf_vars[i].data; i++) {
4096 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
4097 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4098 }
4099
4100 /*
4101 * Make a copy of dev_name, because '.procname' is regarded as const
4102 * by sysctl and we wouldn't want anyone to change it under our feet
4103 * (see SIOCSIFNAME).
4104 */
4105 t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4106 if (!t->dev_name)
4107 goto free;
4108
4109 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
4110 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].ctl_name = ctl_name;
4111
4112 t->sysctl_header = register_sysctl_paths(addrconf_ctl_path,
4113 t->addrconf_vars);
4114 if (t->sysctl_header == NULL)
4115 goto free_procname;
4116
4117 p->sysctl = t;
4118 return;
4119
4120 free_procname:
4121 kfree(t->dev_name);
4122 free:
4123 kfree(t);
4124 out:
4125 return;
4126 }
4127
4128 static void addrconf_sysctl_register(struct inet6_dev *idev)
4129 {
4130 __addrconf_sysctl_register(idev->dev->name, idev->dev->ifindex,
4131 idev, &idev->cnf);
4132 }
4133
4134 static void addrconf_sysctl_unregister(struct ipv6_devconf *p)
4135 {
4136 if (p->sysctl) {
4137 struct addrconf_sysctl_table *t = p->sysctl;
4138 p->sysctl = NULL;
4139 unregister_sysctl_table(t->sysctl_header);
4140 kfree(t->dev_name);
4141 kfree(t);
4142 }
4143 }
4144
4145
4146 #endif
4147
4148 /*
4149 * Device notifier
4150 */
4151
4152 int register_inet6addr_notifier(struct notifier_block *nb)
4153 {
4154 return atomic_notifier_chain_register(&inet6addr_chain, nb);
4155 }
4156
4157 EXPORT_SYMBOL(register_inet6addr_notifier);
4158
4159 int unregister_inet6addr_notifier(struct notifier_block *nb)
4160 {
4161 return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
4162 }
4163
4164 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4165
4166 /*
4167 * Init / cleanup code
4168 */
4169
4170 int __init addrconf_init(void)
4171 {
4172 int err;
4173
4174 if ((err = ipv6_addr_label_init()) < 0) {
4175 printk(KERN_CRIT "IPv6 Addrconf: cannot initialize default policy table: %d.\n",
4176 err);
4177 return err;
4178 }
4179
4180 /* The addrconf netdev notifier requires that loopback_dev
4181 * has it's ipv6 private information allocated and setup
4182 * before it can bring up and give link-local addresses
4183 * to other devices which are up.
4184 *
4185 * Unfortunately, loopback_dev is not necessarily the first
4186 * entry in the global dev_base list of net devices. In fact,
4187 * it is likely to be the very last entry on that list.
4188 * So this causes the notifier registry below to try and
4189 * give link-local addresses to all devices besides loopback_dev
4190 * first, then loopback_dev, which cases all the non-loopback_dev
4191 * devices to fail to get a link-local address.
4192 *
4193 * So, as a temporary fix, allocate the ipv6 structure for
4194 * loopback_dev first by hand.
4195 * Longer term, all of the dependencies ipv6 has upon the loopback
4196 * device and it being up should be removed.
4197 */
4198 rtnl_lock();
4199 if (!ipv6_add_dev(init_net.loopback_dev))
4200 err = -ENOMEM;
4201 rtnl_unlock();
4202 if (err)
4203 return err;
4204
4205 ip6_null_entry.u.dst.dev = init_net.loopback_dev;
4206 ip6_null_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev);
4207 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
4208 ip6_prohibit_entry.u.dst.dev = init_net.loopback_dev;
4209 ip6_prohibit_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev);
4210 ip6_blk_hole_entry.u.dst.dev = init_net.loopback_dev;
4211 ip6_blk_hole_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev);
4212 #endif
4213
4214 register_netdevice_notifier(&ipv6_dev_notf);
4215
4216 addrconf_verify(0);
4217
4218 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4219 if (err < 0)
4220 goto errout;
4221
4222 /* Only the first call to __rtnl_register can fail */
4223 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4224 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4225 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4226 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4227 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4228
4229 ipv6_addr_label_rtnl_register();
4230
4231 #ifdef CONFIG_SYSCTL
4232 __addrconf_sysctl_register("all", NET_PROTO_CONF_ALL,
4233 NULL, &ipv6_devconf);
4234 __addrconf_sysctl_register("default", NET_PROTO_CONF_DEFAULT,
4235 NULL, &ipv6_devconf_dflt);
4236 #endif
4237
4238 return 0;
4239 errout:
4240 unregister_netdevice_notifier(&ipv6_dev_notf);
4241
4242 return err;
4243 }
4244
4245 void __exit addrconf_cleanup(void)
4246 {
4247 struct net_device *dev;
4248 struct inet6_ifaddr *ifa;
4249 int i;
4250
4251 unregister_netdevice_notifier(&ipv6_dev_notf);
4252
4253 #ifdef CONFIG_SYSCTL
4254 addrconf_sysctl_unregister(&ipv6_devconf_dflt);
4255 addrconf_sysctl_unregister(&ipv6_devconf);
4256 #endif
4257
4258 rtnl_lock();
4259
4260 /*
4261 * clean dev list.
4262 */
4263
4264 for_each_netdev(&init_net, dev) {
4265 if (__in6_dev_get(dev) == NULL)
4266 continue;
4267 addrconf_ifdown(dev, 1);
4268 }
4269 addrconf_ifdown(init_net.loopback_dev, 2);
4270
4271 /*
4272 * Check hash table.
4273 */
4274
4275 write_lock_bh(&addrconf_hash_lock);
4276 for (i=0; i < IN6_ADDR_HSIZE; i++) {
4277 for (ifa=inet6_addr_lst[i]; ifa; ) {
4278 struct inet6_ifaddr *bifa;
4279
4280 bifa = ifa;
4281 ifa = ifa->lst_next;
4282 printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
4283 /* Do not free it; something is wrong.
4284 Now we can investigate it with debugger.
4285 */
4286 }
4287 }
4288 write_unlock_bh(&addrconf_hash_lock);
4289
4290 del_timer(&addr_chk_timer);
4291
4292 rtnl_unlock();
4293 }
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