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NFSv4: Ensure that /proc/self/mountinfo displays the minor version number
[linux-2.6/kvm.git] / net / ipv6 / addrconf.c
blobe1a698df5706a9bcff5889e4b734ad66d6dbfb55
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 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 */
14
15 /*
16 * Changes:
17 *
18 * Janos Farkas : delete timer on ifdown
19 * <chexum@bankinf.banki.hu>
20 * Andi Kleen : kill double kfree on module
21 * unload.
22 * Maciej W. Rozycki : FDDI support
23 * sekiya@USAGI : Don't send too many RS
24 * packets.
25 * yoshfuji@USAGI : Fixed interval between DAD
26 * packets.
27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
28 * address validation timer.
29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
30 * support.
31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
32 * address on a same interface.
33 * YOSHIFUJI Hideaki @USAGI : ARCnet support
34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
35 * seq_file.
36 * YOSHIFUJI Hideaki @USAGI : improved source address
37 * selection; consider scope,
38 * status etc.
39 */
40
41 #include <linux/errno.h>
42 #include <linux/types.h>
43 #include <linux/kernel.h>
44 #include <linux/socket.h>
45 #include <linux/sockios.h>
46 #include <linux/net.h>
47 #include <linux/in6.h>
48 #include <linux/netdevice.h>
49 #include <linux/if_addr.h>
50 #include <linux/if_arp.h>
51 #include <linux/if_arcnet.h>
52 #include <linux/if_infiniband.h>
53 #include <linux/route.h>
54 #include <linux/inetdevice.h>
55 #include <linux/init.h>
56 #include <linux/slab.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 <linux/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 #define ADDRCONF_TIMER_FUZZ_MINUS (HZ > 50 ? HZ/50 : 1)
104 #define ADDRCONF_TIMER_FUZZ (HZ / 4)
105 #define ADDRCONF_TIMER_FUZZ_MAX (HZ)
106
107 #ifdef CONFIG_SYSCTL
108 static void addrconf_sysctl_register(struct inet6_dev *idev);
109 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
110 #else
111 static inline void addrconf_sysctl_register(struct inet6_dev *idev)
112 {
113 }
114
115 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
116 {
117 }
118 #endif
119
120 #ifdef CONFIG_IPV6_PRIVACY
121 static int __ipv6_regen_rndid(struct inet6_dev *idev);
122 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
123 static void ipv6_regen_rndid(unsigned long data);
124
125 static int desync_factor = MAX_DESYNC_FACTOR * HZ;
126 #endif
127
128 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
129 static int ipv6_count_addresses(struct inet6_dev *idev);
130
131 /*
132 * Configured unicast address hash table
133 */
134 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
135 static DEFINE_SPINLOCK(addrconf_hash_lock);
136
137 static void addrconf_verify(unsigned long);
138
139 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
140 static DEFINE_SPINLOCK(addrconf_verify_lock);
141
142 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
143 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
144
145 static void addrconf_type_change(struct net_device *dev,
146 unsigned long event);
147 static int addrconf_ifdown(struct net_device *dev, int how);
148
149 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
150 static void addrconf_dad_timer(unsigned long data);
151 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
152 static void addrconf_dad_run(struct inet6_dev *idev);
153 static void addrconf_rs_timer(unsigned long data);
154 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
155 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
156
157 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
158 struct prefix_info *pinfo);
159 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
160 struct net_device *dev);
161
162 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
163
164 static struct ipv6_devconf ipv6_devconf __read_mostly = {
165 .forwarding = 0,
166 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
167 .mtu6 = IPV6_MIN_MTU,
168 .accept_ra = 1,
169 .accept_redirects = 1,
170 .autoconf = 1,
171 .force_mld_version = 0,
172 .dad_transmits = 1,
173 .rtr_solicits = MAX_RTR_SOLICITATIONS,
174 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
175 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
176 #ifdef CONFIG_IPV6_PRIVACY
177 .use_tempaddr = 0,
178 .temp_valid_lft = TEMP_VALID_LIFETIME,
179 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
180 .regen_max_retry = REGEN_MAX_RETRY,
181 .max_desync_factor = MAX_DESYNC_FACTOR,
182 #endif
183 .max_addresses = IPV6_MAX_ADDRESSES,
184 .accept_ra_defrtr = 1,
185 .accept_ra_pinfo = 1,
186 #ifdef CONFIG_IPV6_ROUTER_PREF
187 .accept_ra_rtr_pref = 1,
188 .rtr_probe_interval = 60 * HZ,
189 #ifdef CONFIG_IPV6_ROUTE_INFO
190 .accept_ra_rt_info_max_plen = 0,
191 #endif
192 #endif
193 .proxy_ndp = 0,
194 .accept_source_route = 0, /* we do not accept RH0 by default. */
195 .disable_ipv6 = 0,
196 .accept_dad = 1,
197 };
198
199 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
200 .forwarding = 0,
201 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
202 .mtu6 = IPV6_MIN_MTU,
203 .accept_ra = 1,
204 .accept_redirects = 1,
205 .autoconf = 1,
206 .dad_transmits = 1,
207 .rtr_solicits = MAX_RTR_SOLICITATIONS,
208 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
209 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
210 #ifdef CONFIG_IPV6_PRIVACY
211 .use_tempaddr = 0,
212 .temp_valid_lft = TEMP_VALID_LIFETIME,
213 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
214 .regen_max_retry = REGEN_MAX_RETRY,
215 .max_desync_factor = MAX_DESYNC_FACTOR,
216 #endif
217 .max_addresses = IPV6_MAX_ADDRESSES,
218 .accept_ra_defrtr = 1,
219 .accept_ra_pinfo = 1,
220 #ifdef CONFIG_IPV6_ROUTER_PREF
221 .accept_ra_rtr_pref = 1,
222 .rtr_probe_interval = 60 * HZ,
223 #ifdef CONFIG_IPV6_ROUTE_INFO
224 .accept_ra_rt_info_max_plen = 0,
225 #endif
226 #endif
227 .proxy_ndp = 0,
228 .accept_source_route = 0, /* we do not accept RH0 by default. */
229 .disable_ipv6 = 0,
230 .accept_dad = 1,
231 };
232
233 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
234 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
235 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
236 const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
237 const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
238
239 /* Check if a valid qdisc is available */
240 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
241 {
242 return !qdisc_tx_is_noop(dev);
243 }
244
245 /* Check if a route is valid prefix route */
246 static inline int addrconf_is_prefix_route(const struct rt6_info *rt)
247 {
248 return ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0);
249 }
250
251 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
252 {
253 if (del_timer(&ifp->timer))
254 __in6_ifa_put(ifp);
255 }
256
257 enum addrconf_timer_t {
258 AC_NONE,
259 AC_DAD,
260 AC_RS,
261 };
262
263 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
264 enum addrconf_timer_t what,
265 unsigned long when)
266 {
267 if (!del_timer(&ifp->timer))
268 in6_ifa_hold(ifp);
269
270 switch (what) {
271 case AC_DAD:
272 ifp->timer.function = addrconf_dad_timer;
273 break;
274 case AC_RS:
275 ifp->timer.function = addrconf_rs_timer;
276 break;
277 default:
278 break;
279 }
280 ifp->timer.expires = jiffies + when;
281 add_timer(&ifp->timer);
282 }
283
284 static int snmp6_alloc_dev(struct inet6_dev *idev)
285 {
286 if (snmp_mib_init((void __percpu **)idev->stats.ipv6,
287 sizeof(struct ipstats_mib)) < 0)
288 goto err_ip;
289 if (snmp_mib_init((void __percpu **)idev->stats.icmpv6,
290 sizeof(struct icmpv6_mib)) < 0)
291 goto err_icmp;
292 if (snmp_mib_init((void __percpu **)idev->stats.icmpv6msg,
293 sizeof(struct icmpv6msg_mib)) < 0)
294 goto err_icmpmsg;
295
296 return 0;
297
298 err_icmpmsg:
299 snmp_mib_free((void __percpu **)idev->stats.icmpv6);
300 err_icmp:
301 snmp_mib_free((void __percpu **)idev->stats.ipv6);
302 err_ip:
303 return -ENOMEM;
304 }
305
306 static void snmp6_free_dev(struct inet6_dev *idev)
307 {
308 snmp_mib_free((void __percpu **)idev->stats.icmpv6msg);
309 snmp_mib_free((void __percpu **)idev->stats.icmpv6);
310 snmp_mib_free((void __percpu **)idev->stats.ipv6);
311 }
312
313 /* Nobody refers to this device, we may destroy it. */
314
315 static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
316 {
317 struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
318 kfree(idev);
319 }
320
321 void in6_dev_finish_destroy(struct inet6_dev *idev)
322 {
323 struct net_device *dev = idev->dev;
324
325 WARN_ON(!list_empty(&idev->addr_list));
326 WARN_ON(idev->mc_list != NULL);
327
328 #ifdef NET_REFCNT_DEBUG
329 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
330 #endif
331 dev_put(dev);
332 if (!idev->dead) {
333 pr_warning("Freeing alive inet6 device %p\n", idev);
334 return;
335 }
336 snmp6_free_dev(idev);
337 call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
338 }
339
340 EXPORT_SYMBOL(in6_dev_finish_destroy);
341
342 static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
343 {
344 struct inet6_dev *ndev;
345
346 ASSERT_RTNL();
347
348 if (dev->mtu < IPV6_MIN_MTU)
349 return NULL;
350
351 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
352
353 if (ndev == NULL)
354 return NULL;
355
356 rwlock_init(&ndev->lock);
357 ndev->dev = dev;
358 INIT_LIST_HEAD(&ndev->addr_list);
359
360 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
361 ndev->cnf.mtu6 = dev->mtu;
362 ndev->cnf.sysctl = NULL;
363 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
364 if (ndev->nd_parms == NULL) {
365 kfree(ndev);
366 return NULL;
367 }
368 if (ndev->cnf.forwarding)
369 dev_disable_lro(dev);
370 /* We refer to the device */
371 dev_hold(dev);
372
373 if (snmp6_alloc_dev(ndev) < 0) {
374 ADBG((KERN_WARNING
375 "%s(): cannot allocate memory for statistics; dev=%s.\n",
376 __func__, dev->name));
377 neigh_parms_release(&nd_tbl, ndev->nd_parms);
378 ndev->dead = 1;
379 in6_dev_finish_destroy(ndev);
380 return NULL;
381 }
382
383 if (snmp6_register_dev(ndev) < 0) {
384 ADBG((KERN_WARNING
385 "%s(): cannot create /proc/net/dev_snmp6/%s\n",
386 __func__, dev->name));
387 neigh_parms_release(&nd_tbl, ndev->nd_parms);
388 ndev->dead = 1;
389 in6_dev_finish_destroy(ndev);
390 return NULL;
391 }
392
393 /* One reference from device. We must do this before
394 * we invoke __ipv6_regen_rndid().
395 */
396 in6_dev_hold(ndev);
397
398 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
399 ndev->cnf.accept_dad = -1;
400
401 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
402 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
403 printk(KERN_INFO
404 "%s: Disabled Multicast RS\n",
405 dev->name);
406 ndev->cnf.rtr_solicits = 0;
407 }
408 #endif
409
410 #ifdef CONFIG_IPV6_PRIVACY
411 INIT_LIST_HEAD(&ndev->tempaddr_list);
412 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
413 if ((dev->flags&IFF_LOOPBACK) ||
414 dev->type == ARPHRD_TUNNEL ||
415 dev->type == ARPHRD_TUNNEL6 ||
416 dev->type == ARPHRD_SIT ||
417 dev->type == ARPHRD_NONE) {
418 printk(KERN_INFO
419 "%s: Disabled Privacy Extensions\n",
420 dev->name);
421 ndev->cnf.use_tempaddr = -1;
422 } else {
423 in6_dev_hold(ndev);
424 ipv6_regen_rndid((unsigned long) ndev);
425 }
426 #endif
427
428 if (netif_running(dev) && addrconf_qdisc_ok(dev))
429 ndev->if_flags |= IF_READY;
430
431 ipv6_mc_init_dev(ndev);
432 ndev->tstamp = jiffies;
433 addrconf_sysctl_register(ndev);
434 /* protected by rtnl_lock */
435 rcu_assign_pointer(dev->ip6_ptr, ndev);
436
437 /* Join all-node multicast group */
438 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
439
440 return ndev;
441 }
442
443 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
444 {
445 struct inet6_dev *idev;
446
447 ASSERT_RTNL();
448
449 idev = __in6_dev_get(dev);
450 if (!idev) {
451 idev = ipv6_add_dev(dev);
452 if (!idev)
453 return NULL;
454 }
455
456 if (dev->flags&IFF_UP)
457 ipv6_mc_up(idev);
458 return idev;
459 }
460
461 #ifdef CONFIG_SYSCTL
462 static void dev_forward_change(struct inet6_dev *idev)
463 {
464 struct net_device *dev;
465 struct inet6_ifaddr *ifa;
466
467 if (!idev)
468 return;
469 dev = idev->dev;
470 if (idev->cnf.forwarding)
471 dev_disable_lro(dev);
472 if (dev && (dev->flags & IFF_MULTICAST)) {
473 if (idev->cnf.forwarding)
474 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
475 else
476 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
477 }
478
479 list_for_each_entry(ifa, &idev->addr_list, if_list) {
480 if (ifa->flags&IFA_F_TENTATIVE)
481 continue;
482 if (idev->cnf.forwarding)
483 addrconf_join_anycast(ifa);
484 else
485 addrconf_leave_anycast(ifa);
486 }
487 }
488
489
490 static void addrconf_forward_change(struct net *net, __s32 newf)
491 {
492 struct net_device *dev;
493 struct inet6_dev *idev;
494
495 rcu_read_lock();
496 for_each_netdev_rcu(net, dev) {
497 idev = __in6_dev_get(dev);
498 if (idev) {
499 int changed = (!idev->cnf.forwarding) ^ (!newf);
500 idev->cnf.forwarding = newf;
501 if (changed)
502 dev_forward_change(idev);
503 }
504 }
505 rcu_read_unlock();
506 }
507
508 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old)
509 {
510 struct net *net;
511
512 net = (struct net *)table->extra2;
513 if (p == &net->ipv6.devconf_dflt->forwarding)
514 return 0;
515
516 if (!rtnl_trylock()) {
517 /* Restore the original values before restarting */
518 *p = old;
519 return restart_syscall();
520 }
521
522 if (p == &net->ipv6.devconf_all->forwarding) {
523 __s32 newf = net->ipv6.devconf_all->forwarding;
524 net->ipv6.devconf_dflt->forwarding = newf;
525 addrconf_forward_change(net, newf);
526 } else if ((!*p) ^ (!old))
527 dev_forward_change((struct inet6_dev *)table->extra1);
528 rtnl_unlock();
529
530 if (*p)
531 rt6_purge_dflt_routers(net);
532 return 1;
533 }
534 #endif
535
536 static void inet6_ifa_finish_destroy_rcu(struct rcu_head *head)
537 {
538 struct inet6_ifaddr *ifp = container_of(head, struct inet6_ifaddr, rcu);
539 kfree(ifp);
540 }
541
542 /* Nobody refers to this ifaddr, destroy it */
543 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
544 {
545 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
546
547 #ifdef NET_REFCNT_DEBUG
548 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
549 #endif
550
551 in6_dev_put(ifp->idev);
552
553 if (del_timer(&ifp->timer))
554 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp);
555
556 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
557 pr_warning("Freeing alive inet6 address %p\n", ifp);
558 return;
559 }
560 dst_release(&ifp->rt->u.dst);
561
562 call_rcu(&ifp->rcu, inet6_ifa_finish_destroy_rcu);
563 }
564
565 static void
566 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
567 {
568 struct list_head *p;
569 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
570
571 /*
572 * Each device address list is sorted in order of scope -
573 * global before linklocal.
574 */
575 list_for_each(p, &idev->addr_list) {
576 struct inet6_ifaddr *ifa
577 = list_entry(p, struct inet6_ifaddr, if_list);
578 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
579 break;
580 }
581
582 list_add_tail(&ifp->if_list, p);
583 }
584
585 static u32 ipv6_addr_hash(const struct in6_addr *addr)
586 {
587 /*
588 * We perform the hash function over the last 64 bits of the address
589 * This will include the IEEE address token on links that support it.
590 */
591 return jhash_2words((__force u32)addr->s6_addr32[2],
592 (__force u32)addr->s6_addr32[3], 0)
593 & (IN6_ADDR_HSIZE - 1);
594 }
595
596 /* On success it returns ifp with increased reference count */
597
598 static struct inet6_ifaddr *
599 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
600 int scope, u32 flags)
601 {
602 struct inet6_ifaddr *ifa = NULL;
603 struct rt6_info *rt;
604 unsigned int hash;
605 int err = 0;
606 int addr_type = ipv6_addr_type(addr);
607
608 if (addr_type == IPV6_ADDR_ANY ||
609 addr_type & IPV6_ADDR_MULTICAST ||
610 (!(idev->dev->flags & IFF_LOOPBACK) &&
611 addr_type & IPV6_ADDR_LOOPBACK))
612 return ERR_PTR(-EADDRNOTAVAIL);
613
614 rcu_read_lock_bh();
615 if (idev->dead) {
616 err = -ENODEV; /*XXX*/
617 goto out2;
618 }
619
620 if (idev->cnf.disable_ipv6) {
621 err = -EACCES;
622 goto out2;
623 }
624
625 spin_lock(&addrconf_hash_lock);
626
627 /* Ignore adding duplicate addresses on an interface */
628 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
629 ADBG(("ipv6_add_addr: already assigned\n"));
630 err = -EEXIST;
631 goto out;
632 }
633
634 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
635
636 if (ifa == NULL) {
637 ADBG(("ipv6_add_addr: malloc failed\n"));
638 err = -ENOBUFS;
639 goto out;
640 }
641
642 rt = addrconf_dst_alloc(idev, addr, 0);
643 if (IS_ERR(rt)) {
644 err = PTR_ERR(rt);
645 goto out;
646 }
647
648 ipv6_addr_copy(&ifa->addr, addr);
649
650 spin_lock_init(&ifa->lock);
651 spin_lock_init(&ifa->state_lock);
652 init_timer(&ifa->timer);
653 INIT_HLIST_NODE(&ifa->addr_lst);
654 ifa->timer.data = (unsigned long) ifa;
655 ifa->scope = scope;
656 ifa->prefix_len = pfxlen;
657 ifa->flags = flags | IFA_F_TENTATIVE;
658 ifa->cstamp = ifa->tstamp = jiffies;
659
660 ifa->rt = rt;
661
662 /*
663 * part one of RFC 4429, section 3.3
664 * We should not configure an address as
665 * optimistic if we do not yet know the link
666 * layer address of our nexhop router
667 */
668
669 if (rt->rt6i_nexthop == NULL)
670 ifa->flags &= ~IFA_F_OPTIMISTIC;
671
672 ifa->idev = idev;
673 in6_dev_hold(idev);
674 /* For caller */
675 in6_ifa_hold(ifa);
676
677 /* Add to big hash table */
678 hash = ipv6_addr_hash(addr);
679
680 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
681 spin_unlock(&addrconf_hash_lock);
682
683 write_lock(&idev->lock);
684 /* Add to inet6_dev unicast addr list. */
685 ipv6_link_dev_addr(idev, ifa);
686
687 #ifdef CONFIG_IPV6_PRIVACY
688 if (ifa->flags&IFA_F_TEMPORARY) {
689 list_add(&ifa->tmp_list, &idev->tempaddr_list);
690 in6_ifa_hold(ifa);
691 }
692 #endif
693
694 in6_ifa_hold(ifa);
695 write_unlock(&idev->lock);
696 out2:
697 rcu_read_unlock_bh();
698
699 if (likely(err == 0))
700 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
701 else {
702 kfree(ifa);
703 ifa = ERR_PTR(err);
704 }
705
706 return ifa;
707 out:
708 spin_unlock(&addrconf_hash_lock);
709 goto out2;
710 }
711
712 /* This function wants to get referenced ifp and releases it before return */
713
714 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
715 {
716 struct inet6_ifaddr *ifa, *ifn;
717 struct inet6_dev *idev = ifp->idev;
718 int state;
719 int hash;
720 int deleted = 0, onlink = 0;
721 unsigned long expires = jiffies;
722
723 hash = ipv6_addr_hash(&ifp->addr);
724
725 spin_lock_bh(&ifp->state_lock);
726 state = ifp->state;
727 ifp->state = INET6_IFADDR_STATE_DEAD;
728 spin_unlock_bh(&ifp->state_lock);
729
730 if (state == INET6_IFADDR_STATE_DEAD)
731 goto out;
732
733 spin_lock_bh(&addrconf_hash_lock);
734 hlist_del_init_rcu(&ifp->addr_lst);
735 spin_unlock_bh(&addrconf_hash_lock);
736
737 write_lock_bh(&idev->lock);
738 #ifdef CONFIG_IPV6_PRIVACY
739 if (ifp->flags&IFA_F_TEMPORARY) {
740 list_del(&ifp->tmp_list);
741 if (ifp->ifpub) {
742 in6_ifa_put(ifp->ifpub);
743 ifp->ifpub = NULL;
744 }
745 __in6_ifa_put(ifp);
746 }
747 #endif
748
749 list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) {
750 if (ifa == ifp) {
751 list_del_init(&ifp->if_list);
752 __in6_ifa_put(ifp);
753
754 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
755 break;
756 deleted = 1;
757 continue;
758 } else if (ifp->flags & IFA_F_PERMANENT) {
759 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
760 ifp->prefix_len)) {
761 if (ifa->flags & IFA_F_PERMANENT) {
762 onlink = 1;
763 if (deleted)
764 break;
765 } else {
766 unsigned long lifetime;
767
768 if (!onlink)
769 onlink = -1;
770
771 spin_lock(&ifa->lock);
772
773 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
774 /*
775 * Note: Because this address is
776 * not permanent, lifetime <
777 * LONG_MAX / HZ here.
778 */
779 if (time_before(expires,
780 ifa->tstamp + lifetime * HZ))
781 expires = ifa->tstamp + lifetime * HZ;
782 spin_unlock(&ifa->lock);
783 }
784 }
785 }
786 }
787 write_unlock_bh(&idev->lock);
788
789 addrconf_del_timer(ifp);
790
791 ipv6_ifa_notify(RTM_DELADDR, ifp);
792
793 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
794
795 /*
796 * Purge or update corresponding prefix
797 *
798 * 1) we don't purge prefix here if address was not permanent.
799 * prefix is managed by its own lifetime.
800 * 2) if there're no addresses, delete prefix.
801 * 3) if there're still other permanent address(es),
802 * corresponding prefix is still permanent.
803 * 4) otherwise, update prefix lifetime to the
804 * longest valid lifetime among the corresponding
805 * addresses on the device.
806 * Note: subsequent RA will update lifetime.
807 *
808 * --yoshfuji
809 */
810 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
811 struct in6_addr prefix;
812 struct rt6_info *rt;
813 struct net *net = dev_net(ifp->idev->dev);
814 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
815 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1);
816
817 if (rt && addrconf_is_prefix_route(rt)) {
818 if (onlink == 0) {
819 ip6_del_rt(rt);
820 rt = NULL;
821 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
822 rt->rt6i_expires = expires;
823 rt->rt6i_flags |= RTF_EXPIRES;
824 }
825 }
826 dst_release(&rt->u.dst);
827 }
828
829 out:
830 in6_ifa_put(ifp);
831 }
832
833 #ifdef CONFIG_IPV6_PRIVACY
834 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
835 {
836 struct inet6_dev *idev = ifp->idev;
837 struct in6_addr addr, *tmpaddr;
838 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
839 unsigned long regen_advance;
840 int tmp_plen;
841 int ret = 0;
842 int max_addresses;
843 u32 addr_flags;
844
845 write_lock(&idev->lock);
846 if (ift) {
847 spin_lock_bh(&ift->lock);
848 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
849 spin_unlock_bh(&ift->lock);
850 tmpaddr = &addr;
851 } else {
852 tmpaddr = NULL;
853 }
854 retry:
855 in6_dev_hold(idev);
856 if (idev->cnf.use_tempaddr <= 0) {
857 write_unlock(&idev->lock);
858 printk(KERN_INFO
859 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
860 in6_dev_put(idev);
861 ret = -1;
862 goto out;
863 }
864 spin_lock_bh(&ifp->lock);
865 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
866 idev->cnf.use_tempaddr = -1; /*XXX*/
867 spin_unlock_bh(&ifp->lock);
868 write_unlock(&idev->lock);
869 printk(KERN_WARNING
870 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
871 in6_dev_put(idev);
872 ret = -1;
873 goto out;
874 }
875 in6_ifa_hold(ifp);
876 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
877 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
878 spin_unlock_bh(&ifp->lock);
879 write_unlock(&idev->lock);
880 printk(KERN_WARNING
881 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
882 in6_ifa_put(ifp);
883 in6_dev_put(idev);
884 ret = -1;
885 goto out;
886 }
887 memcpy(&addr.s6_addr[8], idev->rndid, 8);
888 tmp_valid_lft = min_t(__u32,
889 ifp->valid_lft,
890 idev->cnf.temp_valid_lft);
891 tmp_prefered_lft = min_t(__u32,
892 ifp->prefered_lft,
893 idev->cnf.temp_prefered_lft - desync_factor / HZ);
894 tmp_plen = ifp->prefix_len;
895 max_addresses = idev->cnf.max_addresses;
896 tmp_cstamp = ifp->cstamp;
897 tmp_tstamp = ifp->tstamp;
898 spin_unlock_bh(&ifp->lock);
899
900 regen_advance = idev->cnf.regen_max_retry *
901 idev->cnf.dad_transmits *
902 idev->nd_parms->retrans_time / HZ;
903 write_unlock(&idev->lock);
904
905 /* A temporary address is created only if this calculated Preferred
906 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
907 * an implementation must not create a temporary address with a zero
908 * Preferred Lifetime.
909 */
910 if (tmp_prefered_lft <= regen_advance) {
911 in6_ifa_put(ifp);
912 in6_dev_put(idev);
913 ret = -1;
914 goto out;
915 }
916
917 addr_flags = IFA_F_TEMPORARY;
918 /* set in addrconf_prefix_rcv() */
919 if (ifp->flags & IFA_F_OPTIMISTIC)
920 addr_flags |= IFA_F_OPTIMISTIC;
921
922 ift = !max_addresses ||
923 ipv6_count_addresses(idev) < max_addresses ?
924 ipv6_add_addr(idev, &addr, tmp_plen,
925 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
926 addr_flags) : NULL;
927 if (!ift || IS_ERR(ift)) {
928 in6_ifa_put(ifp);
929 in6_dev_put(idev);
930 printk(KERN_INFO
931 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
932 tmpaddr = &addr;
933 write_lock(&idev->lock);
934 goto retry;
935 }
936
937 spin_lock_bh(&ift->lock);
938 ift->ifpub = ifp;
939 ift->valid_lft = tmp_valid_lft;
940 ift->prefered_lft = tmp_prefered_lft;
941 ift->cstamp = tmp_cstamp;
942 ift->tstamp = tmp_tstamp;
943 spin_unlock_bh(&ift->lock);
944
945 addrconf_dad_start(ift, 0);
946 in6_ifa_put(ift);
947 in6_dev_put(idev);
948 out:
949 return ret;
950 }
951 #endif
952
953 /*
954 * Choose an appropriate source address (RFC3484)
955 */
956 enum {
957 IPV6_SADDR_RULE_INIT = 0,
958 IPV6_SADDR_RULE_LOCAL,
959 IPV6_SADDR_RULE_SCOPE,
960 IPV6_SADDR_RULE_PREFERRED,
961 #ifdef CONFIG_IPV6_MIP6
962 IPV6_SADDR_RULE_HOA,
963 #endif
964 IPV6_SADDR_RULE_OIF,
965 IPV6_SADDR_RULE_LABEL,
966 #ifdef CONFIG_IPV6_PRIVACY
967 IPV6_SADDR_RULE_PRIVACY,
968 #endif
969 IPV6_SADDR_RULE_ORCHID,
970 IPV6_SADDR_RULE_PREFIX,
971 IPV6_SADDR_RULE_MAX
972 };
973
974 struct ipv6_saddr_score {
975 int rule;
976 int addr_type;
977 struct inet6_ifaddr *ifa;
978 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
979 int scopedist;
980 int matchlen;
981 };
982
983 struct ipv6_saddr_dst {
984 const struct in6_addr *addr;
985 int ifindex;
986 int scope;
987 int label;
988 unsigned int prefs;
989 };
990
991 static inline int ipv6_saddr_preferred(int type)
992 {
993 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
994 return 1;
995 return 0;
996 }
997
998 static int ipv6_get_saddr_eval(struct net *net,
999 struct ipv6_saddr_score *score,
1000 struct ipv6_saddr_dst *dst,
1001 int i)
1002 {
1003 int ret;
1004
1005 if (i <= score->rule) {
1006 switch (i) {
1007 case IPV6_SADDR_RULE_SCOPE:
1008 ret = score->scopedist;
1009 break;
1010 case IPV6_SADDR_RULE_PREFIX:
1011 ret = score->matchlen;
1012 break;
1013 default:
1014 ret = !!test_bit(i, score->scorebits);
1015 }
1016 goto out;
1017 }
1018
1019 switch (i) {
1020 case IPV6_SADDR_RULE_INIT:
1021 /* Rule 0: remember if hiscore is not ready yet */
1022 ret = !!score->ifa;
1023 break;
1024 case IPV6_SADDR_RULE_LOCAL:
1025 /* Rule 1: Prefer same address */
1026 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1027 break;
1028 case IPV6_SADDR_RULE_SCOPE:
1029 /* Rule 2: Prefer appropriate scope
1030 *
1031 * ret
1032 * ^
1033 * -1 | d 15
1034 * ---+--+-+---> scope
1035 * |
1036 * | d is scope of the destination.
1037 * B-d | \
1038 * | \ <- smaller scope is better if
1039 * B-15 | \ if scope is enough for destinaion.
1040 * | ret = B - scope (-1 <= scope >= d <= 15).
1041 * d-C-1 | /
1042 * |/ <- greater is better
1043 * -C / if scope is not enough for destination.
1044 * /| ret = scope - C (-1 <= d < scope <= 15).
1045 *
1046 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1047 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1048 * Assume B = 0 and we get C > 29.
1049 */
1050 ret = __ipv6_addr_src_scope(score->addr_type);
1051 if (ret >= dst->scope)
1052 ret = -ret;
1053 else
1054 ret -= 128; /* 30 is enough */
1055 score->scopedist = ret;
1056 break;
1057 case IPV6_SADDR_RULE_PREFERRED:
1058 /* Rule 3: Avoid deprecated and optimistic addresses */
1059 ret = ipv6_saddr_preferred(score->addr_type) ||
1060 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1061 break;
1062 #ifdef CONFIG_IPV6_MIP6
1063 case IPV6_SADDR_RULE_HOA:
1064 {
1065 /* Rule 4: Prefer home address */
1066 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1067 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1068 break;
1069 }
1070 #endif
1071 case IPV6_SADDR_RULE_OIF:
1072 /* Rule 5: Prefer outgoing interface */
1073 ret = (!dst->ifindex ||
1074 dst->ifindex == score->ifa->idev->dev->ifindex);
1075 break;
1076 case IPV6_SADDR_RULE_LABEL:
1077 /* Rule 6: Prefer matching label */
1078 ret = ipv6_addr_label(net,
1079 &score->ifa->addr, score->addr_type,
1080 score->ifa->idev->dev->ifindex) == dst->label;
1081 break;
1082 #ifdef CONFIG_IPV6_PRIVACY
1083 case IPV6_SADDR_RULE_PRIVACY:
1084 {
1085 /* Rule 7: Prefer public address
1086 * Note: prefer temprary address if use_tempaddr >= 2
1087 */
1088 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1089 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1090 score->ifa->idev->cnf.use_tempaddr >= 2;
1091 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1092 break;
1093 }
1094 #endif
1095 case IPV6_SADDR_RULE_ORCHID:
1096 /* Rule 8-: Prefer ORCHID vs ORCHID or
1097 * non-ORCHID vs non-ORCHID
1098 */
1099 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1100 ipv6_addr_orchid(dst->addr));
1101 break;
1102 case IPV6_SADDR_RULE_PREFIX:
1103 /* Rule 8: Use longest matching prefix */
1104 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr,
1105 dst->addr);
1106 break;
1107 default:
1108 ret = 0;
1109 }
1110
1111 if (ret)
1112 __set_bit(i, score->scorebits);
1113 score->rule = i;
1114 out:
1115 return ret;
1116 }
1117
1118 int ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev,
1119 const struct in6_addr *daddr, unsigned int prefs,
1120 struct in6_addr *saddr)
1121 {
1122 struct ipv6_saddr_score scores[2],
1123 *score = &scores[0], *hiscore = &scores[1];
1124 struct ipv6_saddr_dst dst;
1125 struct net_device *dev;
1126 int dst_type;
1127
1128 dst_type = __ipv6_addr_type(daddr);
1129 dst.addr = daddr;
1130 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1131 dst.scope = __ipv6_addr_src_scope(dst_type);
1132 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1133 dst.prefs = prefs;
1134
1135 hiscore->rule = -1;
1136 hiscore->ifa = NULL;
1137
1138 rcu_read_lock();
1139
1140 for_each_netdev_rcu(net, dev) {
1141 struct inet6_dev *idev;
1142
1143 /* Candidate Source Address (section 4)
1144 * - multicast and link-local destination address,
1145 * the set of candidate source address MUST only
1146 * include addresses assigned to interfaces
1147 * belonging to the same link as the outgoing
1148 * interface.
1149 * (- For site-local destination addresses, the
1150 * set of candidate source addresses MUST only
1151 * include addresses assigned to interfaces
1152 * belonging to the same site as the outgoing
1153 * interface.)
1154 */
1155 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1156 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1157 dst.ifindex && dev->ifindex != dst.ifindex)
1158 continue;
1159
1160 idev = __in6_dev_get(dev);
1161 if (!idev)
1162 continue;
1163
1164 read_lock_bh(&idev->lock);
1165 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1166 int i;
1167
1168 /*
1169 * - Tentative Address (RFC2462 section 5.4)
1170 * - A tentative address is not considered
1171 * "assigned to an interface" in the traditional
1172 * sense, unless it is also flagged as optimistic.
1173 * - Candidate Source Address (section 4)
1174 * - In any case, anycast addresses, multicast
1175 * addresses, and the unspecified address MUST
1176 * NOT be included in a candidate set.
1177 */
1178 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1179 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1180 continue;
1181
1182 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1183
1184 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1185 score->addr_type & IPV6_ADDR_MULTICAST)) {
1186 LIMIT_NETDEBUG(KERN_DEBUG
1187 "ADDRCONF: unspecified / multicast address "
1188 "assigned as unicast address on %s",
1189 dev->name);
1190 continue;
1191 }
1192
1193 score->rule = -1;
1194 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1195
1196 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1197 int minihiscore, miniscore;
1198
1199 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1200 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1201
1202 if (minihiscore > miniscore) {
1203 if (i == IPV6_SADDR_RULE_SCOPE &&
1204 score->scopedist > 0) {
1205 /*
1206 * special case:
1207 * each remaining entry
1208 * has too small (not enough)
1209 * scope, because ifa entries
1210 * are sorted by their scope
1211 * values.
1212 */
1213 goto try_nextdev;
1214 }
1215 break;
1216 } else if (minihiscore < miniscore) {
1217 if (hiscore->ifa)
1218 in6_ifa_put(hiscore->ifa);
1219
1220 in6_ifa_hold(score->ifa);
1221
1222 swap(hiscore, score);
1223
1224 /* restore our iterator */
1225 score->ifa = hiscore->ifa;
1226
1227 break;
1228 }
1229 }
1230 }
1231 try_nextdev:
1232 read_unlock_bh(&idev->lock);
1233 }
1234 rcu_read_unlock();
1235
1236 if (!hiscore->ifa)
1237 return -EADDRNOTAVAIL;
1238
1239 ipv6_addr_copy(saddr, &hiscore->ifa->addr);
1240 in6_ifa_put(hiscore->ifa);
1241 return 0;
1242 }
1243 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1244
1245 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1246 unsigned char banned_flags)
1247 {
1248 struct inet6_dev *idev;
1249 int err = -EADDRNOTAVAIL;
1250
1251 rcu_read_lock();
1252 idev = __in6_dev_get(dev);
1253 if (idev) {
1254 struct inet6_ifaddr *ifp;
1255
1256 read_lock_bh(&idev->lock);
1257 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1258 if (ifp->scope == IFA_LINK &&
1259 !(ifp->flags & banned_flags)) {
1260 ipv6_addr_copy(addr, &ifp->addr);
1261 err = 0;
1262 break;
1263 }
1264 }
1265 read_unlock_bh(&idev->lock);
1266 }
1267 rcu_read_unlock();
1268 return err;
1269 }
1270
1271 static int ipv6_count_addresses(struct inet6_dev *idev)
1272 {
1273 int cnt = 0;
1274 struct inet6_ifaddr *ifp;
1275
1276 read_lock_bh(&idev->lock);
1277 list_for_each_entry(ifp, &idev->addr_list, if_list)
1278 cnt++;
1279 read_unlock_bh(&idev->lock);
1280 return cnt;
1281 }
1282
1283 int ipv6_chk_addr(struct net *net, struct in6_addr *addr,
1284 struct net_device *dev, int strict)
1285 {
1286 struct inet6_ifaddr *ifp;
1287 struct hlist_node *node;
1288 unsigned int hash = ipv6_addr_hash(addr);
1289
1290 rcu_read_lock_bh();
1291 hlist_for_each_entry_rcu(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1292 if (!net_eq(dev_net(ifp->idev->dev), net))
1293 continue;
1294 if (ipv6_addr_equal(&ifp->addr, addr) &&
1295 !(ifp->flags&IFA_F_TENTATIVE) &&
1296 (dev == NULL || ifp->idev->dev == dev ||
1297 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1298 rcu_read_unlock_bh();
1299 return 1;
1300 }
1301 }
1302
1303 rcu_read_unlock_bh();
1304 return 0;
1305 }
1306 EXPORT_SYMBOL(ipv6_chk_addr);
1307
1308 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1309 struct net_device *dev)
1310 {
1311 unsigned int hash = ipv6_addr_hash(addr);
1312 struct inet6_ifaddr *ifp;
1313 struct hlist_node *node;
1314
1315 hlist_for_each_entry(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1316 if (!net_eq(dev_net(ifp->idev->dev), net))
1317 continue;
1318 if (ipv6_addr_equal(&ifp->addr, addr)) {
1319 if (dev == NULL || ifp->idev->dev == dev)
1320 return true;
1321 }
1322 }
1323 return false;
1324 }
1325
1326 int ipv6_chk_prefix(struct in6_addr *addr, struct net_device *dev)
1327 {
1328 struct inet6_dev *idev;
1329 struct inet6_ifaddr *ifa;
1330 int onlink;
1331
1332 onlink = 0;
1333 rcu_read_lock();
1334 idev = __in6_dev_get(dev);
1335 if (idev) {
1336 read_lock_bh(&idev->lock);
1337 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1338 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1339 ifa->prefix_len);
1340 if (onlink)
1341 break;
1342 }
1343 read_unlock_bh(&idev->lock);
1344 }
1345 rcu_read_unlock();
1346 return onlink;
1347 }
1348
1349 EXPORT_SYMBOL(ipv6_chk_prefix);
1350
1351 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1352 struct net_device *dev, int strict)
1353 {
1354 struct inet6_ifaddr *ifp, *result = NULL;
1355 unsigned int hash = ipv6_addr_hash(addr);
1356 struct hlist_node *node;
1357
1358 rcu_read_lock_bh();
1359 hlist_for_each_entry_rcu_bh(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1360 if (!net_eq(dev_net(ifp->idev->dev), net))
1361 continue;
1362 if (ipv6_addr_equal(&ifp->addr, addr)) {
1363 if (dev == NULL || ifp->idev->dev == dev ||
1364 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1365 result = ifp;
1366 in6_ifa_hold(ifp);
1367 break;
1368 }
1369 }
1370 }
1371 rcu_read_unlock_bh();
1372
1373 return result;
1374 }
1375
1376 /* Gets referenced address, destroys ifaddr */
1377
1378 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1379 {
1380 if (ifp->flags&IFA_F_PERMANENT) {
1381 spin_lock_bh(&ifp->lock);
1382 addrconf_del_timer(ifp);
1383 ifp->flags |= IFA_F_TENTATIVE;
1384 if (dad_failed)
1385 ifp->flags |= IFA_F_DADFAILED;
1386 spin_unlock_bh(&ifp->lock);
1387 if (dad_failed)
1388 ipv6_ifa_notify(0, ifp);
1389 in6_ifa_put(ifp);
1390 #ifdef CONFIG_IPV6_PRIVACY
1391 } else if (ifp->flags&IFA_F_TEMPORARY) {
1392 struct inet6_ifaddr *ifpub;
1393 spin_lock_bh(&ifp->lock);
1394 ifpub = ifp->ifpub;
1395 if (ifpub) {
1396 in6_ifa_hold(ifpub);
1397 spin_unlock_bh(&ifp->lock);
1398 ipv6_create_tempaddr(ifpub, ifp);
1399 in6_ifa_put(ifpub);
1400 } else {
1401 spin_unlock_bh(&ifp->lock);
1402 }
1403 ipv6_del_addr(ifp);
1404 #endif
1405 } else
1406 ipv6_del_addr(ifp);
1407 }
1408
1409 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1410 {
1411 int err = -ENOENT;
1412
1413 spin_lock(&ifp->state_lock);
1414 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1415 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1416 err = 0;
1417 }
1418 spin_unlock(&ifp->state_lock);
1419
1420 return err;
1421 }
1422
1423 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1424 {
1425 struct inet6_dev *idev = ifp->idev;
1426
1427 if (addrconf_dad_end(ifp))
1428 return;
1429
1430 if (net_ratelimit())
1431 printk(KERN_INFO "%s: IPv6 duplicate address %pI6c detected!\n",
1432 ifp->idev->dev->name, &ifp->addr);
1433
1434 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1435 struct in6_addr addr;
1436
1437 addr.s6_addr32[0] = htonl(0xfe800000);
1438 addr.s6_addr32[1] = 0;
1439
1440 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1441 ipv6_addr_equal(&ifp->addr, &addr)) {
1442 /* DAD failed for link-local based on MAC address */
1443 idev->cnf.disable_ipv6 = 1;
1444
1445 printk(KERN_INFO "%s: IPv6 being disabled!\n",
1446 ifp->idev->dev->name);
1447 }
1448 }
1449
1450 addrconf_dad_stop(ifp, 1);
1451 }
1452
1453 /* Join to solicited addr multicast group. */
1454
1455 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1456 {
1457 struct in6_addr maddr;
1458
1459 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1460 return;
1461
1462 addrconf_addr_solict_mult(addr, &maddr);
1463 ipv6_dev_mc_inc(dev, &maddr);
1464 }
1465
1466 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1467 {
1468 struct in6_addr maddr;
1469
1470 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1471 return;
1472
1473 addrconf_addr_solict_mult(addr, &maddr);
1474 __ipv6_dev_mc_dec(idev, &maddr);
1475 }
1476
1477 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1478 {
1479 struct in6_addr addr;
1480 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1481 if (ipv6_addr_any(&addr))
1482 return;
1483 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1484 }
1485
1486 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1487 {
1488 struct in6_addr addr;
1489 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1490 if (ipv6_addr_any(&addr))
1491 return;
1492 __ipv6_dev_ac_dec(ifp->idev, &addr);
1493 }
1494
1495 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1496 {
1497 if (dev->addr_len != ETH_ALEN)
1498 return -1;
1499 memcpy(eui, dev->dev_addr, 3);
1500 memcpy(eui + 5, dev->dev_addr + 3, 3);
1501
1502 /*
1503 * The zSeries OSA network cards can be shared among various
1504 * OS instances, but the OSA cards have only one MAC address.
1505 * This leads to duplicate address conflicts in conjunction
1506 * with IPv6 if more than one instance uses the same card.
1507 *
1508 * The driver for these cards can deliver a unique 16-bit
1509 * identifier for each instance sharing the same card. It is
1510 * placed instead of 0xFFFE in the interface identifier. The
1511 * "u" bit of the interface identifier is not inverted in this
1512 * case. Hence the resulting interface identifier has local
1513 * scope according to RFC2373.
1514 */
1515 if (dev->dev_id) {
1516 eui[3] = (dev->dev_id >> 8) & 0xFF;
1517 eui[4] = dev->dev_id & 0xFF;
1518 } else {
1519 eui[3] = 0xFF;
1520 eui[4] = 0xFE;
1521 eui[0] ^= 2;
1522 }
1523 return 0;
1524 }
1525
1526 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1527 {
1528 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1529 if (dev->addr_len != ARCNET_ALEN)
1530 return -1;
1531 memset(eui, 0, 7);
1532 eui[7] = *(u8*)dev->dev_addr;
1533 return 0;
1534 }
1535
1536 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1537 {
1538 if (dev->addr_len != INFINIBAND_ALEN)
1539 return -1;
1540 memcpy(eui, dev->dev_addr + 12, 8);
1541 eui[0] |= 2;
1542 return 0;
1543 }
1544
1545 int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1546 {
1547 if (addr == 0)
1548 return -1;
1549 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1550 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1551 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1552 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1553 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1554 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1555 eui[1] = 0;
1556 eui[2] = 0x5E;
1557 eui[3] = 0xFE;
1558 memcpy(eui + 4, &addr, 4);
1559 return 0;
1560 }
1561 EXPORT_SYMBOL(__ipv6_isatap_ifid);
1562
1563 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1564 {
1565 if (dev->priv_flags & IFF_ISATAP)
1566 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1567 return -1;
1568 }
1569
1570 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1571 {
1572 switch (dev->type) {
1573 case ARPHRD_ETHER:
1574 case ARPHRD_FDDI:
1575 case ARPHRD_IEEE802_TR:
1576 return addrconf_ifid_eui48(eui, dev);
1577 case ARPHRD_ARCNET:
1578 return addrconf_ifid_arcnet(eui, dev);
1579 case ARPHRD_INFINIBAND:
1580 return addrconf_ifid_infiniband(eui, dev);
1581 case ARPHRD_SIT:
1582 return addrconf_ifid_sit(eui, dev);
1583 }
1584 return -1;
1585 }
1586
1587 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1588 {
1589 int err = -1;
1590 struct inet6_ifaddr *ifp;
1591
1592 read_lock_bh(&idev->lock);
1593 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1594 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1595 memcpy(eui, ifp->addr.s6_addr+8, 8);
1596 err = 0;
1597 break;
1598 }
1599 }
1600 read_unlock_bh(&idev->lock);
1601 return err;
1602 }
1603
1604 #ifdef CONFIG_IPV6_PRIVACY
1605 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1606 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1607 {
1608 regen:
1609 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1610 idev->rndid[0] &= ~0x02;
1611
1612 /*
1613 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1614 * check if generated address is not inappropriate
1615 *
1616 * - Reserved subnet anycast (RFC 2526)
1617 * 11111101 11....11 1xxxxxxx
1618 * - ISATAP (RFC4214) 6.1
1619 * 00-00-5E-FE-xx-xx-xx-xx
1620 * - value 0
1621 * - XXX: already assigned to an address on the device
1622 */
1623 if (idev->rndid[0] == 0xfd &&
1624 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1625 (idev->rndid[7]&0x80))
1626 goto regen;
1627 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1628 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1629 goto regen;
1630 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1631 goto regen;
1632 }
1633
1634 return 0;
1635 }
1636
1637 static void ipv6_regen_rndid(unsigned long data)
1638 {
1639 struct inet6_dev *idev = (struct inet6_dev *) data;
1640 unsigned long expires;
1641
1642 rcu_read_lock_bh();
1643 write_lock_bh(&idev->lock);
1644
1645 if (idev->dead)
1646 goto out;
1647
1648 if (__ipv6_regen_rndid(idev) < 0)
1649 goto out;
1650
1651 expires = jiffies +
1652 idev->cnf.temp_prefered_lft * HZ -
1653 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1654 if (time_before(expires, jiffies)) {
1655 printk(KERN_WARNING
1656 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1657 idev->dev->name);
1658 goto out;
1659 }
1660
1661 if (!mod_timer(&idev->regen_timer, expires))
1662 in6_dev_hold(idev);
1663
1664 out:
1665 write_unlock_bh(&idev->lock);
1666 rcu_read_unlock_bh();
1667 in6_dev_put(idev);
1668 }
1669
1670 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1671 int ret = 0;
1672
1673 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1674 ret = __ipv6_regen_rndid(idev);
1675 return ret;
1676 }
1677 #endif
1678
1679 /*
1680 * Add prefix route.
1681 */
1682
1683 static void
1684 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1685 unsigned long expires, u32 flags)
1686 {
1687 struct fib6_config cfg = {
1688 .fc_table = RT6_TABLE_PREFIX,
1689 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1690 .fc_ifindex = dev->ifindex,
1691 .fc_expires = expires,
1692 .fc_dst_len = plen,
1693 .fc_flags = RTF_UP | flags,
1694 .fc_nlinfo.nl_net = dev_net(dev),
1695 .fc_protocol = RTPROT_KERNEL,
1696 };
1697
1698 ipv6_addr_copy(&cfg.fc_dst, pfx);
1699
1700 /* Prevent useless cloning on PtP SIT.
1701 This thing is done here expecting that the whole
1702 class of non-broadcast devices need not cloning.
1703 */
1704 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1705 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1706 cfg.fc_flags |= RTF_NONEXTHOP;
1707 #endif
1708
1709 ip6_route_add(&cfg);
1710 }
1711
1712 /* Create "default" multicast route to the interface */
1713
1714 static void addrconf_add_mroute(struct net_device *dev)
1715 {
1716 struct fib6_config cfg = {
1717 .fc_table = RT6_TABLE_LOCAL,
1718 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1719 .fc_ifindex = dev->ifindex,
1720 .fc_dst_len = 8,
1721 .fc_flags = RTF_UP,
1722 .fc_nlinfo.nl_net = dev_net(dev),
1723 };
1724
1725 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1726
1727 ip6_route_add(&cfg);
1728 }
1729
1730 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1731 static void sit_route_add(struct net_device *dev)
1732 {
1733 struct fib6_config cfg = {
1734 .fc_table = RT6_TABLE_MAIN,
1735 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1736 .fc_ifindex = dev->ifindex,
1737 .fc_dst_len = 96,
1738 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1739 .fc_nlinfo.nl_net = dev_net(dev),
1740 };
1741
1742 /* prefix length - 96 bits "::d.d.d.d" */
1743 ip6_route_add(&cfg);
1744 }
1745 #endif
1746
1747 static void addrconf_add_lroute(struct net_device *dev)
1748 {
1749 struct in6_addr addr;
1750
1751 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1752 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1753 }
1754
1755 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1756 {
1757 struct inet6_dev *idev;
1758
1759 ASSERT_RTNL();
1760
1761 idev = ipv6_find_idev(dev);
1762 if (!idev)
1763 return NULL;
1764
1765 /* Add default multicast route */
1766 addrconf_add_mroute(dev);
1767
1768 /* Add link local route */
1769 addrconf_add_lroute(dev);
1770 return idev;
1771 }
1772
1773 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1774 {
1775 struct prefix_info *pinfo;
1776 __u32 valid_lft;
1777 __u32 prefered_lft;
1778 int addr_type;
1779 struct inet6_dev *in6_dev;
1780 struct net *net = dev_net(dev);
1781
1782 pinfo = (struct prefix_info *) opt;
1783
1784 if (len < sizeof(struct prefix_info)) {
1785 ADBG(("addrconf: prefix option too short\n"));
1786 return;
1787 }
1788
1789 /*
1790 * Validation checks ([ADDRCONF], page 19)
1791 */
1792
1793 addr_type = ipv6_addr_type(&pinfo->prefix);
1794
1795 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1796 return;
1797
1798 valid_lft = ntohl(pinfo->valid);
1799 prefered_lft = ntohl(pinfo->prefered);
1800
1801 if (prefered_lft > valid_lft) {
1802 if (net_ratelimit())
1803 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1804 return;
1805 }
1806
1807 in6_dev = in6_dev_get(dev);
1808
1809 if (in6_dev == NULL) {
1810 if (net_ratelimit())
1811 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1812 return;
1813 }
1814
1815 /*
1816 * Two things going on here:
1817 * 1) Add routes for on-link prefixes
1818 * 2) Configure prefixes with the auto flag set
1819 */
1820
1821 if (pinfo->onlink) {
1822 struct rt6_info *rt;
1823 unsigned long rt_expires;
1824
1825 /* Avoid arithmetic overflow. Really, we could
1826 * save rt_expires in seconds, likely valid_lft,
1827 * but it would require division in fib gc, that it
1828 * not good.
1829 */
1830 if (HZ > USER_HZ)
1831 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
1832 else
1833 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
1834
1835 if (addrconf_finite_timeout(rt_expires))
1836 rt_expires *= HZ;
1837
1838 rt = rt6_lookup(net, &pinfo->prefix, NULL,
1839 dev->ifindex, 1);
1840
1841 if (rt && addrconf_is_prefix_route(rt)) {
1842 /* Autoconf prefix route */
1843 if (valid_lft == 0) {
1844 ip6_del_rt(rt);
1845 rt = NULL;
1846 } else if (addrconf_finite_timeout(rt_expires)) {
1847 /* not infinity */
1848 rt->rt6i_expires = jiffies + rt_expires;
1849 rt->rt6i_flags |= RTF_EXPIRES;
1850 } else {
1851 rt->rt6i_flags &= ~RTF_EXPIRES;
1852 rt->rt6i_expires = 0;
1853 }
1854 } else if (valid_lft) {
1855 clock_t expires = 0;
1856 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
1857 if (addrconf_finite_timeout(rt_expires)) {
1858 /* not infinity */
1859 flags |= RTF_EXPIRES;
1860 expires = jiffies_to_clock_t(rt_expires);
1861 }
1862 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1863 dev, expires, flags);
1864 }
1865 if (rt)
1866 dst_release(&rt->u.dst);
1867 }
1868
1869 /* Try to figure out our local address for this prefix */
1870
1871 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1872 struct inet6_ifaddr * ifp;
1873 struct in6_addr addr;
1874 int create = 0, update_lft = 0;
1875
1876 if (pinfo->prefix_len == 64) {
1877 memcpy(&addr, &pinfo->prefix, 8);
1878 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1879 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1880 in6_dev_put(in6_dev);
1881 return;
1882 }
1883 goto ok;
1884 }
1885 if (net_ratelimit())
1886 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1887 pinfo->prefix_len);
1888 in6_dev_put(in6_dev);
1889 return;
1890
1891 ok:
1892
1893 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1894
1895 if (ifp == NULL && valid_lft) {
1896 int max_addresses = in6_dev->cnf.max_addresses;
1897 u32 addr_flags = 0;
1898
1899 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1900 if (in6_dev->cnf.optimistic_dad &&
1901 !net->ipv6.devconf_all->forwarding)
1902 addr_flags = IFA_F_OPTIMISTIC;
1903 #endif
1904
1905 /* Do not allow to create too much of autoconfigured
1906 * addresses; this would be too easy way to crash kernel.
1907 */
1908 if (!max_addresses ||
1909 ipv6_count_addresses(in6_dev) < max_addresses)
1910 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1911 addr_type&IPV6_ADDR_SCOPE_MASK,
1912 addr_flags);
1913
1914 if (!ifp || IS_ERR(ifp)) {
1915 in6_dev_put(in6_dev);
1916 return;
1917 }
1918
1919 update_lft = create = 1;
1920 ifp->cstamp = jiffies;
1921 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1922 }
1923
1924 if (ifp) {
1925 int flags;
1926 unsigned long now;
1927 #ifdef CONFIG_IPV6_PRIVACY
1928 struct inet6_ifaddr *ift;
1929 #endif
1930 u32 stored_lft;
1931
1932 /* update lifetime (RFC2462 5.5.3 e) */
1933 spin_lock(&ifp->lock);
1934 now = jiffies;
1935 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1936 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1937 else
1938 stored_lft = 0;
1939 if (!update_lft && stored_lft) {
1940 if (valid_lft > MIN_VALID_LIFETIME ||
1941 valid_lft > stored_lft)
1942 update_lft = 1;
1943 else if (stored_lft <= MIN_VALID_LIFETIME) {
1944 /* valid_lft <= stored_lft is always true */
1945 /*
1946 * RFC 4862 Section 5.5.3e:
1947 * "Note that the preferred lifetime of
1948 * the corresponding address is always
1949 * reset to the Preferred Lifetime in
1950 * the received Prefix Information
1951 * option, regardless of whether the
1952 * valid lifetime is also reset or
1953 * ignored."
1954 *
1955 * So if the preferred lifetime in
1956 * this advertisement is different
1957 * than what we have stored, but the
1958 * valid lifetime is invalid, just
1959 * reset prefered_lft.
1960 *
1961 * We must set the valid lifetime
1962 * to the stored lifetime since we'll
1963 * be updating the timestamp below,
1964 * else we'll set it back to the
1965 * minumum.
1966 */
1967 if (prefered_lft != ifp->prefered_lft) {
1968 valid_lft = stored_lft;
1969 update_lft = 1;
1970 }
1971 } else {
1972 valid_lft = MIN_VALID_LIFETIME;
1973 if (valid_lft < prefered_lft)
1974 prefered_lft = valid_lft;
1975 update_lft = 1;
1976 }
1977 }
1978
1979 if (update_lft) {
1980 ifp->valid_lft = valid_lft;
1981 ifp->prefered_lft = prefered_lft;
1982 ifp->tstamp = now;
1983 flags = ifp->flags;
1984 ifp->flags &= ~IFA_F_DEPRECATED;
1985 spin_unlock(&ifp->lock);
1986
1987 if (!(flags&IFA_F_TENTATIVE))
1988 ipv6_ifa_notify(0, ifp);
1989 } else
1990 spin_unlock(&ifp->lock);
1991
1992 #ifdef CONFIG_IPV6_PRIVACY
1993 read_lock_bh(&in6_dev->lock);
1994 /* update all temporary addresses in the list */
1995 list_for_each_entry(ift, &in6_dev->tempaddr_list, tmp_list) {
1996 /*
1997 * When adjusting the lifetimes of an existing
1998 * temporary address, only lower the lifetimes.
1999 * Implementations must not increase the
2000 * lifetimes of an existing temporary address
2001 * when processing a Prefix Information Option.
2002 */
2003 if (ifp != ift->ifpub)
2004 continue;
2005
2006 spin_lock(&ift->lock);
2007 flags = ift->flags;
2008 if (ift->valid_lft > valid_lft &&
2009 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
2010 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
2011 if (ift->prefered_lft > prefered_lft &&
2012 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
2013 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
2014 spin_unlock(&ift->lock);
2015 if (!(flags&IFA_F_TENTATIVE))
2016 ipv6_ifa_notify(0, ift);
2017 }
2018
2019 if (create && in6_dev->cnf.use_tempaddr > 0) {
2020 /*
2021 * When a new public address is created as described in [ADDRCONF],
2022 * also create a new temporary address.
2023 */
2024 read_unlock_bh(&in6_dev->lock);
2025 ipv6_create_tempaddr(ifp, NULL);
2026 } else {
2027 read_unlock_bh(&in6_dev->lock);
2028 }
2029 #endif
2030 in6_ifa_put(ifp);
2031 addrconf_verify(0);
2032 }
2033 }
2034 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2035 in6_dev_put(in6_dev);
2036 }
2037
2038 /*
2039 * Set destination address.
2040 * Special case for SIT interfaces where we create a new "virtual"
2041 * device.
2042 */
2043 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2044 {
2045 struct in6_ifreq ireq;
2046 struct net_device *dev;
2047 int err = -EINVAL;
2048
2049 rtnl_lock();
2050
2051 err = -EFAULT;
2052 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2053 goto err_exit;
2054
2055 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2056
2057 err = -ENODEV;
2058 if (dev == NULL)
2059 goto err_exit;
2060
2061 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2062 if (dev->type == ARPHRD_SIT) {
2063 const struct net_device_ops *ops = dev->netdev_ops;
2064 struct ifreq ifr;
2065 struct ip_tunnel_parm p;
2066
2067 err = -EADDRNOTAVAIL;
2068 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2069 goto err_exit;
2070
2071 memset(&p, 0, sizeof(p));
2072 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2073 p.iph.saddr = 0;
2074 p.iph.version = 4;
2075 p.iph.ihl = 5;
2076 p.iph.protocol = IPPROTO_IPV6;
2077 p.iph.ttl = 64;
2078 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2079
2080 if (ops->ndo_do_ioctl) {
2081 mm_segment_t oldfs = get_fs();
2082
2083 set_fs(KERNEL_DS);
2084 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2085 set_fs(oldfs);
2086 } else
2087 err = -EOPNOTSUPP;
2088
2089 if (err == 0) {
2090 err = -ENOBUFS;
2091 dev = __dev_get_by_name(net, p.name);
2092 if (!dev)
2093 goto err_exit;
2094 err = dev_open(dev);
2095 }
2096 }
2097 #endif
2098
2099 err_exit:
2100 rtnl_unlock();
2101 return err;
2102 }
2103
2104 /*
2105 * Manual configuration of address on an interface
2106 */
2107 static int inet6_addr_add(struct net *net, int ifindex, struct in6_addr *pfx,
2108 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
2109 __u32 valid_lft)
2110 {
2111 struct inet6_ifaddr *ifp;
2112 struct inet6_dev *idev;
2113 struct net_device *dev;
2114 int scope;
2115 u32 flags;
2116 clock_t expires;
2117 unsigned long timeout;
2118
2119 ASSERT_RTNL();
2120
2121 if (plen > 128)
2122 return -EINVAL;
2123
2124 /* check the lifetime */
2125 if (!valid_lft || prefered_lft > valid_lft)
2126 return -EINVAL;
2127
2128 dev = __dev_get_by_index(net, ifindex);
2129 if (!dev)
2130 return -ENODEV;
2131
2132 if ((idev = addrconf_add_dev(dev)) == NULL)
2133 return -ENOBUFS;
2134
2135 scope = ipv6_addr_scope(pfx);
2136
2137 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2138 if (addrconf_finite_timeout(timeout)) {
2139 expires = jiffies_to_clock_t(timeout * HZ);
2140 valid_lft = timeout;
2141 flags = RTF_EXPIRES;
2142 } else {
2143 expires = 0;
2144 flags = 0;
2145 ifa_flags |= IFA_F_PERMANENT;
2146 }
2147
2148 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2149 if (addrconf_finite_timeout(timeout)) {
2150 if (timeout == 0)
2151 ifa_flags |= IFA_F_DEPRECATED;
2152 prefered_lft = timeout;
2153 }
2154
2155 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2156
2157 if (!IS_ERR(ifp)) {
2158 spin_lock_bh(&ifp->lock);
2159 ifp->valid_lft = valid_lft;
2160 ifp->prefered_lft = prefered_lft;
2161 ifp->tstamp = jiffies;
2162 spin_unlock_bh(&ifp->lock);
2163
2164 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2165 expires, flags);
2166 /*
2167 * Note that section 3.1 of RFC 4429 indicates
2168 * that the Optimistic flag should not be set for
2169 * manually configured addresses
2170 */
2171 addrconf_dad_start(ifp, 0);
2172 in6_ifa_put(ifp);
2173 addrconf_verify(0);
2174 return 0;
2175 }
2176
2177 return PTR_ERR(ifp);
2178 }
2179
2180 static int inet6_addr_del(struct net *net, int ifindex, struct in6_addr *pfx,
2181 unsigned int plen)
2182 {
2183 struct inet6_ifaddr *ifp;
2184 struct inet6_dev *idev;
2185 struct net_device *dev;
2186
2187 if (plen > 128)
2188 return -EINVAL;
2189
2190 dev = __dev_get_by_index(net, ifindex);
2191 if (!dev)
2192 return -ENODEV;
2193
2194 if ((idev = __in6_dev_get(dev)) == NULL)
2195 return -ENXIO;
2196
2197 read_lock_bh(&idev->lock);
2198 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2199 if (ifp->prefix_len == plen &&
2200 ipv6_addr_equal(pfx, &ifp->addr)) {
2201 in6_ifa_hold(ifp);
2202 read_unlock_bh(&idev->lock);
2203
2204 ipv6_del_addr(ifp);
2205
2206 /* If the last address is deleted administratively,
2207 disable IPv6 on this interface.
2208 */
2209 if (list_empty(&idev->addr_list))
2210 addrconf_ifdown(idev->dev, 1);
2211 return 0;
2212 }
2213 }
2214 read_unlock_bh(&idev->lock);
2215 return -EADDRNOTAVAIL;
2216 }
2217
2218
2219 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2220 {
2221 struct in6_ifreq ireq;
2222 int err;
2223
2224 if (!capable(CAP_NET_ADMIN))
2225 return -EPERM;
2226
2227 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2228 return -EFAULT;
2229
2230 rtnl_lock();
2231 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2232 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2233 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2234 rtnl_unlock();
2235 return err;
2236 }
2237
2238 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2239 {
2240 struct in6_ifreq ireq;
2241 int err;
2242
2243 if (!capable(CAP_NET_ADMIN))
2244 return -EPERM;
2245
2246 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2247 return -EFAULT;
2248
2249 rtnl_lock();
2250 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2251 ireq.ifr6_prefixlen);
2252 rtnl_unlock();
2253 return err;
2254 }
2255
2256 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2257 int plen, int scope)
2258 {
2259 struct inet6_ifaddr *ifp;
2260
2261 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT);
2262 if (!IS_ERR(ifp)) {
2263 spin_lock_bh(&ifp->lock);
2264 ifp->flags &= ~IFA_F_TENTATIVE;
2265 spin_unlock_bh(&ifp->lock);
2266 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2267 in6_ifa_put(ifp);
2268 }
2269 }
2270
2271 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2272 static void sit_add_v4_addrs(struct inet6_dev *idev)
2273 {
2274 struct in6_addr addr;
2275 struct net_device *dev;
2276 struct net *net = dev_net(idev->dev);
2277 int scope;
2278
2279 ASSERT_RTNL();
2280
2281 memset(&addr, 0, sizeof(struct in6_addr));
2282 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2283
2284 if (idev->dev->flags&IFF_POINTOPOINT) {
2285 addr.s6_addr32[0] = htonl(0xfe800000);
2286 scope = IFA_LINK;
2287 } else {
2288 scope = IPV6_ADDR_COMPATv4;
2289 }
2290
2291 if (addr.s6_addr32[3]) {
2292 add_addr(idev, &addr, 128, scope);
2293 return;
2294 }
2295
2296 for_each_netdev(net, dev) {
2297 struct in_device * in_dev = __in_dev_get_rtnl(dev);
2298 if (in_dev && (dev->flags & IFF_UP)) {
2299 struct in_ifaddr * ifa;
2300
2301 int flag = scope;
2302
2303 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2304 int plen;
2305
2306 addr.s6_addr32[3] = ifa->ifa_local;
2307
2308 if (ifa->ifa_scope == RT_SCOPE_LINK)
2309 continue;
2310 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2311 if (idev->dev->flags&IFF_POINTOPOINT)
2312 continue;
2313 flag |= IFA_HOST;
2314 }
2315 if (idev->dev->flags&IFF_POINTOPOINT)
2316 plen = 64;
2317 else
2318 plen = 96;
2319
2320 add_addr(idev, &addr, plen, flag);
2321 }
2322 }
2323 }
2324 }
2325 #endif
2326
2327 static void init_loopback(struct net_device *dev)
2328 {
2329 struct inet6_dev *idev;
2330
2331 /* ::1 */
2332
2333 ASSERT_RTNL();
2334
2335 if ((idev = ipv6_find_idev(dev)) == NULL) {
2336 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2337 return;
2338 }
2339
2340 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2341 }
2342
2343 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2344 {
2345 struct inet6_ifaddr * ifp;
2346 u32 addr_flags = IFA_F_PERMANENT;
2347
2348 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2349 if (idev->cnf.optimistic_dad &&
2350 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2351 addr_flags |= IFA_F_OPTIMISTIC;
2352 #endif
2353
2354
2355 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2356 if (!IS_ERR(ifp)) {
2357 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2358 addrconf_dad_start(ifp, 0);
2359 in6_ifa_put(ifp);
2360 }
2361 }
2362
2363 static void addrconf_dev_config(struct net_device *dev)
2364 {
2365 struct in6_addr addr;
2366 struct inet6_dev * idev;
2367
2368 ASSERT_RTNL();
2369
2370 if ((dev->type != ARPHRD_ETHER) &&
2371 (dev->type != ARPHRD_FDDI) &&
2372 (dev->type != ARPHRD_IEEE802_TR) &&
2373 (dev->type != ARPHRD_ARCNET) &&
2374 (dev->type != ARPHRD_INFINIBAND)) {
2375 /* Alas, we support only Ethernet autoconfiguration. */
2376 return;
2377 }
2378
2379 idev = addrconf_add_dev(dev);
2380 if (idev == NULL)
2381 return;
2382
2383 memset(&addr, 0, sizeof(struct in6_addr));
2384 addr.s6_addr32[0] = htonl(0xFE800000);
2385
2386 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2387 addrconf_add_linklocal(idev, &addr);
2388 }
2389
2390 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2391 static void addrconf_sit_config(struct net_device *dev)
2392 {
2393 struct inet6_dev *idev;
2394
2395 ASSERT_RTNL();
2396
2397 /*
2398 * Configure the tunnel with one of our IPv4
2399 * addresses... we should configure all of
2400 * our v4 addrs in the tunnel
2401 */
2402
2403 if ((idev = ipv6_find_idev(dev)) == NULL) {
2404 printk(KERN_DEBUG "init sit: add_dev failed\n");
2405 return;
2406 }
2407
2408 if (dev->priv_flags & IFF_ISATAP) {
2409 struct in6_addr addr;
2410
2411 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2412 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2413 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2414 addrconf_add_linklocal(idev, &addr);
2415 return;
2416 }
2417
2418 sit_add_v4_addrs(idev);
2419
2420 if (dev->flags&IFF_POINTOPOINT) {
2421 addrconf_add_mroute(dev);
2422 addrconf_add_lroute(dev);
2423 } else
2424 sit_route_add(dev);
2425 }
2426 #endif
2427
2428 static inline int
2429 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2430 {
2431 struct in6_addr lladdr;
2432
2433 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2434 addrconf_add_linklocal(idev, &lladdr);
2435 return 0;
2436 }
2437 return -1;
2438 }
2439
2440 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2441 {
2442 struct net_device *link_dev;
2443 struct net *net = dev_net(idev->dev);
2444
2445 /* first try to inherit the link-local address from the link device */
2446 if (idev->dev->iflink &&
2447 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
2448 if (!ipv6_inherit_linklocal(idev, link_dev))
2449 return;
2450 }
2451 /* then try to inherit it from any device */
2452 for_each_netdev(net, link_dev) {
2453 if (!ipv6_inherit_linklocal(idev, link_dev))
2454 return;
2455 }
2456 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2457 }
2458
2459 /*
2460 * Autoconfigure tunnel with a link-local address so routing protocols,
2461 * DHCPv6, MLD etc. can be run over the virtual link
2462 */
2463
2464 static void addrconf_ip6_tnl_config(struct net_device *dev)
2465 {
2466 struct inet6_dev *idev;
2467
2468 ASSERT_RTNL();
2469
2470 idev = addrconf_add_dev(dev);
2471 if (!idev) {
2472 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2473 return;
2474 }
2475 ip6_tnl_add_linklocal(idev);
2476 }
2477
2478 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2479 void * data)
2480 {
2481 struct net_device *dev = (struct net_device *) data;
2482 struct inet6_dev *idev = __in6_dev_get(dev);
2483 int run_pending = 0;
2484 int err;
2485
2486 switch (event) {
2487 case NETDEV_REGISTER:
2488 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2489 idev = ipv6_add_dev(dev);
2490 if (!idev)
2491 return notifier_from_errno(-ENOMEM);
2492 }
2493 break;
2494
2495 case NETDEV_UP:
2496 case NETDEV_CHANGE:
2497 if (dev->flags & IFF_SLAVE)
2498 break;
2499
2500 if (event == NETDEV_UP) {
2501 if (!addrconf_qdisc_ok(dev)) {
2502 /* device is not ready yet. */
2503 printk(KERN_INFO
2504 "ADDRCONF(NETDEV_UP): %s: "
2505 "link is not ready\n",
2506 dev->name);
2507 break;
2508 }
2509
2510 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2511 idev = ipv6_add_dev(dev);
2512
2513 if (idev) {
2514 idev->if_flags |= IF_READY;
2515 run_pending = 1;
2516 }
2517 } else {
2518 if (!addrconf_qdisc_ok(dev)) {
2519 /* device is still not ready. */
2520 break;
2521 }
2522
2523 if (idev) {
2524 if (idev->if_flags & IF_READY)
2525 /* device is already configured. */
2526 break;
2527 idev->if_flags |= IF_READY;
2528 }
2529
2530 printk(KERN_INFO
2531 "ADDRCONF(NETDEV_CHANGE): %s: "
2532 "link becomes ready\n",
2533 dev->name);
2534
2535 run_pending = 1;
2536 }
2537
2538 switch (dev->type) {
2539 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2540 case ARPHRD_SIT:
2541 addrconf_sit_config(dev);
2542 break;
2543 #endif
2544 case ARPHRD_TUNNEL6:
2545 addrconf_ip6_tnl_config(dev);
2546 break;
2547 case ARPHRD_LOOPBACK:
2548 init_loopback(dev);
2549 break;
2550
2551 default:
2552 addrconf_dev_config(dev);
2553 break;
2554 }
2555
2556 if (idev) {
2557 if (run_pending)
2558 addrconf_dad_run(idev);
2559
2560 /*
2561 * If the MTU changed during the interface down,
2562 * when the interface up, the changed MTU must be
2563 * reflected in the idev as well as routers.
2564 */
2565 if (idev->cnf.mtu6 != dev->mtu &&
2566 dev->mtu >= IPV6_MIN_MTU) {
2567 rt6_mtu_change(dev, dev->mtu);
2568 idev->cnf.mtu6 = dev->mtu;
2569 }
2570 idev->tstamp = jiffies;
2571 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2572
2573 /*
2574 * If the changed mtu during down is lower than
2575 * IPV6_MIN_MTU stop IPv6 on this interface.
2576 */
2577 if (dev->mtu < IPV6_MIN_MTU)
2578 addrconf_ifdown(dev, 1);
2579 }
2580 break;
2581
2582 case NETDEV_CHANGEMTU:
2583 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2584 rt6_mtu_change(dev, dev->mtu);
2585 idev->cnf.mtu6 = dev->mtu;
2586 break;
2587 }
2588
2589 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2590 idev = ipv6_add_dev(dev);
2591 if (idev)
2592 break;
2593 }
2594
2595 /*
2596 * MTU falled under IPV6_MIN_MTU.
2597 * Stop IPv6 on this interface.
2598 */
2599
2600 case NETDEV_DOWN:
2601 case NETDEV_UNREGISTER:
2602 /*
2603 * Remove all addresses from this interface.
2604 */
2605 addrconf_ifdown(dev, event != NETDEV_DOWN);
2606 break;
2607
2608 case NETDEV_CHANGENAME:
2609 if (idev) {
2610 snmp6_unregister_dev(idev);
2611 addrconf_sysctl_unregister(idev);
2612 addrconf_sysctl_register(idev);
2613 err = snmp6_register_dev(idev);
2614 if (err)
2615 return notifier_from_errno(err);
2616 }
2617 break;
2618
2619 case NETDEV_PRE_TYPE_CHANGE:
2620 case NETDEV_POST_TYPE_CHANGE:
2621 addrconf_type_change(dev, event);
2622 break;
2623 }
2624
2625 return NOTIFY_OK;
2626 }
2627
2628 /*
2629 * addrconf module should be notified of a device going up
2630 */
2631 static struct notifier_block ipv6_dev_notf = {
2632 .notifier_call = addrconf_notify,
2633 };
2634
2635 static void addrconf_type_change(struct net_device *dev, unsigned long event)
2636 {
2637 struct inet6_dev *idev;
2638 ASSERT_RTNL();
2639
2640 idev = __in6_dev_get(dev);
2641
2642 if (event == NETDEV_POST_TYPE_CHANGE)
2643 ipv6_mc_remap(idev);
2644 else if (event == NETDEV_PRE_TYPE_CHANGE)
2645 ipv6_mc_unmap(idev);
2646 }
2647
2648 static int addrconf_ifdown(struct net_device *dev, int how)
2649 {
2650 struct net *net = dev_net(dev);
2651 struct inet6_dev *idev;
2652 struct inet6_ifaddr *ifa;
2653 LIST_HEAD(keep_list);
2654 int state;
2655
2656 ASSERT_RTNL();
2657
2658 rt6_ifdown(net, dev);
2659 neigh_ifdown(&nd_tbl, dev);
2660
2661 idev = __in6_dev_get(dev);
2662 if (idev == NULL)
2663 return -ENODEV;
2664
2665 /*
2666 * Step 1: remove reference to ipv6 device from parent device.
2667 * Do not dev_put!
2668 */
2669 if (how) {
2670 idev->dead = 1;
2671
2672 /* protected by rtnl_lock */
2673 rcu_assign_pointer(dev->ip6_ptr, NULL);
2674
2675 /* Step 1.5: remove snmp6 entry */
2676 snmp6_unregister_dev(idev);
2677
2678 }
2679
2680 write_lock_bh(&idev->lock);
2681
2682 /* Step 2: clear flags for stateless addrconf */
2683 if (!how)
2684 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2685
2686 #ifdef CONFIG_IPV6_PRIVACY
2687 if (how && del_timer(&idev->regen_timer))
2688 in6_dev_put(idev);
2689
2690 /* Step 3: clear tempaddr list */
2691 while (!list_empty(&idev->tempaddr_list)) {
2692 ifa = list_first_entry(&idev->tempaddr_list,
2693 struct inet6_ifaddr, tmp_list);
2694 list_del(&ifa->tmp_list);
2695 write_unlock_bh(&idev->lock);
2696 spin_lock_bh(&ifa->lock);
2697
2698 if (ifa->ifpub) {
2699 in6_ifa_put(ifa->ifpub);
2700 ifa->ifpub = NULL;
2701 }
2702 spin_unlock_bh(&ifa->lock);
2703 in6_ifa_put(ifa);
2704 write_lock_bh(&idev->lock);
2705 }
2706 #endif
2707
2708 while (!list_empty(&idev->addr_list)) {
2709 ifa = list_first_entry(&idev->addr_list,
2710 struct inet6_ifaddr, if_list);
2711 addrconf_del_timer(ifa);
2712
2713 /* If just doing link down, and address is permanent
2714 and not link-local, then retain it. */
2715 if (!how &&
2716 (ifa->flags&IFA_F_PERMANENT) &&
2717 !(ipv6_addr_type(&ifa->addr) & IPV6_ADDR_LINKLOCAL)) {
2718 list_move_tail(&ifa->if_list, &keep_list);
2719
2720 /* If not doing DAD on this address, just keep it. */
2721 if ((dev->flags&(IFF_NOARP|IFF_LOOPBACK)) ||
2722 idev->cnf.accept_dad <= 0 ||
2723 (ifa->flags & IFA_F_NODAD))
2724 continue;
2725
2726 /* If it was tentative already, no need to notify */
2727 if (ifa->flags & IFA_F_TENTATIVE)
2728 continue;
2729
2730 /* Flag it for later restoration when link comes up */
2731 ifa->flags |= IFA_F_TENTATIVE;
2732 ifa->state = INET6_IFADDR_STATE_DAD;
2733
2734 write_unlock_bh(&idev->lock);
2735
2736 in6_ifa_hold(ifa);
2737 } else {
2738 list_del(&ifa->if_list);
2739
2740 /* clear hash table */
2741 spin_lock_bh(&addrconf_hash_lock);
2742 hlist_del_init_rcu(&ifa->addr_lst);
2743 spin_unlock_bh(&addrconf_hash_lock);
2744
2745 write_unlock_bh(&idev->lock);
2746 spin_lock_bh(&ifa->state_lock);
2747 state = ifa->state;
2748 ifa->state = INET6_IFADDR_STATE_DEAD;
2749 spin_unlock_bh(&ifa->state_lock);
2750
2751 if (state == INET6_IFADDR_STATE_DEAD)
2752 goto put_ifa;
2753 }
2754
2755 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2756 if (ifa->state == INET6_IFADDR_STATE_DEAD)
2757 atomic_notifier_call_chain(&inet6addr_chain,
2758 NETDEV_DOWN, ifa);
2759
2760 put_ifa:
2761 in6_ifa_put(ifa);
2762
2763 write_lock_bh(&idev->lock);
2764 }
2765
2766 list_splice(&keep_list, &idev->addr_list);
2767
2768 write_unlock_bh(&idev->lock);
2769
2770 /* Step 5: Discard multicast list */
2771 if (how)
2772 ipv6_mc_destroy_dev(idev);
2773 else
2774 ipv6_mc_down(idev);
2775
2776 idev->tstamp = jiffies;
2777
2778 /* Last: Shot the device (if unregistered) */
2779 if (how) {
2780 addrconf_sysctl_unregister(idev);
2781 neigh_parms_release(&nd_tbl, idev->nd_parms);
2782 neigh_ifdown(&nd_tbl, dev);
2783 in6_dev_put(idev);
2784 }
2785 return 0;
2786 }
2787
2788 static void addrconf_rs_timer(unsigned long data)
2789 {
2790 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2791 struct inet6_dev *idev = ifp->idev;
2792
2793 read_lock(&idev->lock);
2794 if (idev->dead || !(idev->if_flags & IF_READY))
2795 goto out;
2796
2797 if (idev->cnf.forwarding)
2798 goto out;
2799
2800 /* Announcement received after solicitation was sent */
2801 if (idev->if_flags & IF_RA_RCVD)
2802 goto out;
2803
2804 spin_lock(&ifp->lock);
2805 if (ifp->probes++ < idev->cnf.rtr_solicits) {
2806 /* The wait after the last probe can be shorter */
2807 addrconf_mod_timer(ifp, AC_RS,
2808 (ifp->probes == idev->cnf.rtr_solicits) ?
2809 idev->cnf.rtr_solicit_delay :
2810 idev->cnf.rtr_solicit_interval);
2811 spin_unlock(&ifp->lock);
2812
2813 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2814 } else {
2815 spin_unlock(&ifp->lock);
2816 /*
2817 * Note: we do not support deprecated "all on-link"
2818 * assumption any longer.
2819 */
2820 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2821 idev->dev->name);
2822 }
2823
2824 out:
2825 read_unlock(&idev->lock);
2826 in6_ifa_put(ifp);
2827 }
2828
2829 /*
2830 * Duplicate Address Detection
2831 */
2832 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2833 {
2834 unsigned long rand_num;
2835 struct inet6_dev *idev = ifp->idev;
2836
2837 if (ifp->flags & IFA_F_OPTIMISTIC)
2838 rand_num = 0;
2839 else
2840 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2841
2842 ifp->probes = idev->cnf.dad_transmits;
2843 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2844 }
2845
2846 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2847 {
2848 struct inet6_dev *idev = ifp->idev;
2849 struct net_device *dev = idev->dev;
2850
2851 addrconf_join_solict(dev, &ifp->addr);
2852
2853 net_srandom(ifp->addr.s6_addr32[3]);
2854
2855 read_lock_bh(&idev->lock);
2856 spin_lock(&ifp->lock);
2857 if (ifp->state == INET6_IFADDR_STATE_DEAD)
2858 goto out;
2859
2860 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2861 idev->cnf.accept_dad < 1 ||
2862 !(ifp->flags&IFA_F_TENTATIVE) ||
2863 ifp->flags & IFA_F_NODAD) {
2864 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
2865 spin_unlock(&ifp->lock);
2866 read_unlock_bh(&idev->lock);
2867
2868 addrconf_dad_completed(ifp);
2869 return;
2870 }
2871
2872 if (!(idev->if_flags & IF_READY)) {
2873 spin_unlock(&ifp->lock);
2874 read_unlock_bh(&idev->lock);
2875 /*
2876 * If the device is not ready:
2877 * - keep it tentative if it is a permanent address.
2878 * - otherwise, kill it.
2879 */
2880 in6_ifa_hold(ifp);
2881 addrconf_dad_stop(ifp, 0);
2882 return;
2883 }
2884
2885 /*
2886 * Optimistic nodes can start receiving
2887 * Frames right away
2888 */
2889 if (ifp->flags & IFA_F_OPTIMISTIC)
2890 ip6_ins_rt(ifp->rt);
2891
2892 addrconf_dad_kick(ifp);
2893 out:
2894 spin_unlock(&ifp->lock);
2895 read_unlock_bh(&idev->lock);
2896 }
2897
2898 static void addrconf_dad_timer(unsigned long data)
2899 {
2900 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2901 struct inet6_dev *idev = ifp->idev;
2902 struct in6_addr mcaddr;
2903
2904 if (!ifp->probes && addrconf_dad_end(ifp))
2905 goto out;
2906
2907 read_lock(&idev->lock);
2908 if (idev->dead || !(idev->if_flags & IF_READY)) {
2909 read_unlock(&idev->lock);
2910 goto out;
2911 }
2912
2913 spin_lock(&ifp->lock);
2914 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
2915 spin_unlock(&ifp->lock);
2916 read_unlock(&idev->lock);
2917 goto out;
2918 }
2919
2920 if (ifp->probes == 0) {
2921 /*
2922 * DAD was successful
2923 */
2924
2925 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
2926 spin_unlock(&ifp->lock);
2927 read_unlock(&idev->lock);
2928
2929 addrconf_dad_completed(ifp);
2930
2931 goto out;
2932 }
2933
2934 ifp->probes--;
2935 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2936 spin_unlock(&ifp->lock);
2937 read_unlock(&idev->lock);
2938
2939 /* send a neighbour solicitation for our addr */
2940 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2941 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
2942 out:
2943 in6_ifa_put(ifp);
2944 }
2945
2946 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2947 {
2948 struct net_device *dev = ifp->idev->dev;
2949
2950 /*
2951 * Configure the address for reception. Now it is valid.
2952 */
2953
2954 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2955
2956 /* If added prefix is link local and forwarding is off,
2957 start sending router solicitations.
2958 */
2959
2960 if (ifp->idev->cnf.forwarding == 0 &&
2961 ifp->idev->cnf.rtr_solicits > 0 &&
2962 (dev->flags&IFF_LOOPBACK) == 0 &&
2963 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2964 /*
2965 * If a host as already performed a random delay
2966 * [...] as part of DAD [...] there is no need
2967 * to delay again before sending the first RS
2968 */
2969 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2970
2971 spin_lock_bh(&ifp->lock);
2972 ifp->probes = 1;
2973 ifp->idev->if_flags |= IF_RS_SENT;
2974 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2975 spin_unlock_bh(&ifp->lock);
2976 }
2977 }
2978
2979 static void addrconf_dad_run(struct inet6_dev *idev)
2980 {
2981 struct inet6_ifaddr *ifp;
2982
2983 read_lock_bh(&idev->lock);
2984 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2985 spin_lock(&ifp->lock);
2986 if (ifp->flags & IFA_F_TENTATIVE &&
2987 ifp->state == INET6_IFADDR_STATE_DAD)
2988 addrconf_dad_kick(ifp);
2989 spin_unlock(&ifp->lock);
2990 }
2991 read_unlock_bh(&idev->lock);
2992 }
2993
2994 #ifdef CONFIG_PROC_FS
2995 struct if6_iter_state {
2996 struct seq_net_private p;
2997 int bucket;
2998 };
2999
3000 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
3001 {
3002 struct inet6_ifaddr *ifa = NULL;
3003 struct if6_iter_state *state = seq->private;
3004 struct net *net = seq_file_net(seq);
3005
3006 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3007 struct hlist_node *n;
3008 hlist_for_each_entry_rcu_bh(ifa, n, &inet6_addr_lst[state->bucket],
3009 addr_lst)
3010 if (net_eq(dev_net(ifa->idev->dev), net))
3011 return ifa;
3012 }
3013 return NULL;
3014 }
3015
3016 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3017 struct inet6_ifaddr *ifa)
3018 {
3019 struct if6_iter_state *state = seq->private;
3020 struct net *net = seq_file_net(seq);
3021 struct hlist_node *n = &ifa->addr_lst;
3022
3023 hlist_for_each_entry_continue_rcu_bh(ifa, n, addr_lst)
3024 if (net_eq(dev_net(ifa->idev->dev), net))
3025 return ifa;
3026
3027 while (++state->bucket < IN6_ADDR_HSIZE) {
3028 hlist_for_each_entry_rcu_bh(ifa, n,
3029 &inet6_addr_lst[state->bucket], addr_lst) {
3030 if (net_eq(dev_net(ifa->idev->dev), net))
3031 return ifa;
3032 }
3033 }
3034
3035 return NULL;
3036 }
3037
3038 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
3039 {
3040 struct inet6_ifaddr *ifa = if6_get_first(seq);
3041
3042 if (ifa)
3043 while (pos && (ifa = if6_get_next(seq, ifa)) != NULL)
3044 --pos;
3045 return pos ? NULL : ifa;
3046 }
3047
3048 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3049 __acquires(rcu_bh)
3050 {
3051 rcu_read_lock_bh();
3052 return if6_get_idx(seq, *pos);
3053 }
3054
3055 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3056 {
3057 struct inet6_ifaddr *ifa;
3058
3059 ifa = if6_get_next(seq, v);
3060 ++*pos;
3061 return ifa;
3062 }
3063
3064 static void if6_seq_stop(struct seq_file *seq, void *v)
3065 __releases(rcu_bh)
3066 {
3067 rcu_read_unlock_bh();
3068 }
3069
3070 static int if6_seq_show(struct seq_file *seq, void *v)
3071 {
3072 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3073 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3074 &ifp->addr,
3075 ifp->idev->dev->ifindex,
3076 ifp->prefix_len,
3077 ifp->scope,
3078 ifp->flags,
3079 ifp->idev->dev->name);
3080 return 0;
3081 }
3082
3083 static const struct seq_operations if6_seq_ops = {
3084 .start = if6_seq_start,
3085 .next = if6_seq_next,
3086 .show = if6_seq_show,
3087 .stop = if6_seq_stop,
3088 };
3089
3090 static int if6_seq_open(struct inode *inode, struct file *file)
3091 {
3092 return seq_open_net(inode, file, &if6_seq_ops,
3093 sizeof(struct if6_iter_state));
3094 }
3095
3096 static const struct file_operations if6_fops = {
3097 .owner = THIS_MODULE,
3098 .open = if6_seq_open,
3099 .read = seq_read,
3100 .llseek = seq_lseek,
3101 .release = seq_release_net,
3102 };
3103
3104 static int __net_init if6_proc_net_init(struct net *net)
3105 {
3106 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
3107 return -ENOMEM;
3108 return 0;
3109 }
3110
3111 static void __net_exit if6_proc_net_exit(struct net *net)
3112 {
3113 proc_net_remove(net, "if_inet6");
3114 }
3115
3116 static struct pernet_operations if6_proc_net_ops = {
3117 .init = if6_proc_net_init,
3118 .exit = if6_proc_net_exit,
3119 };
3120
3121 int __init if6_proc_init(void)
3122 {
3123 return register_pernet_subsys(&if6_proc_net_ops);
3124 }
3125
3126 void if6_proc_exit(void)
3127 {
3128 unregister_pernet_subsys(&if6_proc_net_ops);
3129 }
3130 #endif /* CONFIG_PROC_FS */
3131
3132 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3133 /* Check if address is a home address configured on any interface. */
3134 int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr)
3135 {
3136 int ret = 0;
3137 struct inet6_ifaddr *ifp = NULL;
3138 struct hlist_node *n;
3139 unsigned int hash = ipv6_addr_hash(addr);
3140
3141 rcu_read_lock_bh();
3142 hlist_for_each_entry_rcu_bh(ifp, n, &inet6_addr_lst[hash], addr_lst) {
3143 if (!net_eq(dev_net(ifp->idev->dev), net))
3144 continue;
3145 if (ipv6_addr_equal(&ifp->addr, addr) &&
3146 (ifp->flags & IFA_F_HOMEADDRESS)) {
3147 ret = 1;
3148 break;
3149 }
3150 }
3151 rcu_read_unlock_bh();
3152 return ret;
3153 }
3154 #endif
3155
3156 /*
3157 * Periodic address status verification
3158 */
3159
3160 static void addrconf_verify(unsigned long foo)
3161 {
3162 unsigned long now, next, next_sec, next_sched;
3163 struct inet6_ifaddr *ifp;
3164 struct hlist_node *node;
3165 int i;
3166
3167 rcu_read_lock_bh();
3168 spin_lock(&addrconf_verify_lock);
3169 now = jiffies;
3170 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3171
3172 del_timer(&addr_chk_timer);
3173
3174 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3175 restart:
3176 hlist_for_each_entry_rcu_bh(ifp, node,
3177 &inet6_addr_lst[i], addr_lst) {
3178 unsigned long age;
3179
3180 if (ifp->flags & IFA_F_PERMANENT)
3181 continue;
3182
3183 spin_lock(&ifp->lock);
3184 /* We try to batch several events at once. */
3185 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3186
3187 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3188 age >= ifp->valid_lft) {
3189 spin_unlock(&ifp->lock);
3190 in6_ifa_hold(ifp);
3191 ipv6_del_addr(ifp);
3192 goto restart;
3193 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3194 spin_unlock(&ifp->lock);
3195 continue;
3196 } else if (age >= ifp->prefered_lft) {
3197 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3198 int deprecate = 0;
3199
3200 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3201 deprecate = 1;
3202 ifp->flags |= IFA_F_DEPRECATED;
3203 }
3204
3205 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3206 next = ifp->tstamp + ifp->valid_lft * HZ;
3207
3208 spin_unlock(&ifp->lock);
3209
3210 if (deprecate) {
3211 in6_ifa_hold(ifp);
3212
3213 ipv6_ifa_notify(0, ifp);
3214 in6_ifa_put(ifp);
3215 goto restart;
3216 }
3217 #ifdef CONFIG_IPV6_PRIVACY
3218 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3219 !(ifp->flags&IFA_F_TENTATIVE)) {
3220 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3221 ifp->idev->cnf.dad_transmits *
3222 ifp->idev->nd_parms->retrans_time / HZ;
3223
3224 if (age >= ifp->prefered_lft - regen_advance) {
3225 struct inet6_ifaddr *ifpub = ifp->ifpub;
3226 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3227 next = ifp->tstamp + ifp->prefered_lft * HZ;
3228 if (!ifp->regen_count && ifpub) {
3229 ifp->regen_count++;
3230 in6_ifa_hold(ifp);
3231 in6_ifa_hold(ifpub);
3232 spin_unlock(&ifp->lock);
3233
3234 spin_lock(&ifpub->lock);
3235 ifpub->regen_count = 0;
3236 spin_unlock(&ifpub->lock);
3237 ipv6_create_tempaddr(ifpub, ifp);
3238 in6_ifa_put(ifpub);
3239 in6_ifa_put(ifp);
3240 goto restart;
3241 }
3242 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3243 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3244 spin_unlock(&ifp->lock);
3245 #endif
3246 } else {
3247 /* ifp->prefered_lft <= ifp->valid_lft */
3248 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3249 next = ifp->tstamp + ifp->prefered_lft * HZ;
3250 spin_unlock(&ifp->lock);
3251 }
3252 }
3253 }
3254
3255 next_sec = round_jiffies_up(next);
3256 next_sched = next;
3257
3258 /* If rounded timeout is accurate enough, accept it. */
3259 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3260 next_sched = next_sec;
3261
3262 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3263 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3264 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3265
3266 ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3267 now, next, next_sec, next_sched));
3268
3269 addr_chk_timer.expires = next_sched;
3270 add_timer(&addr_chk_timer);
3271 spin_unlock(&addrconf_verify_lock);
3272 rcu_read_unlock_bh();
3273 }
3274
3275 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3276 {
3277 struct in6_addr *pfx = NULL;
3278
3279 if (addr)
3280 pfx = nla_data(addr);
3281
3282 if (local) {
3283 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3284 pfx = NULL;
3285 else
3286 pfx = nla_data(local);
3287 }
3288
3289 return pfx;
3290 }
3291
3292 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3293 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3294 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3295 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3296 };
3297
3298 static int
3299 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3300 {
3301 struct net *net = sock_net(skb->sk);
3302 struct ifaddrmsg *ifm;
3303 struct nlattr *tb[IFA_MAX+1];
3304 struct in6_addr *pfx;
3305 int err;
3306
3307 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3308 if (err < 0)
3309 return err;
3310
3311 ifm = nlmsg_data(nlh);
3312 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3313 if (pfx == NULL)
3314 return -EINVAL;
3315
3316 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3317 }
3318
3319 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3320 u32 prefered_lft, u32 valid_lft)
3321 {
3322 u32 flags;
3323 clock_t expires;
3324 unsigned long timeout;
3325
3326 if (!valid_lft || (prefered_lft > valid_lft))
3327 return -EINVAL;
3328
3329 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3330 if (addrconf_finite_timeout(timeout)) {
3331 expires = jiffies_to_clock_t(timeout * HZ);
3332 valid_lft = timeout;
3333 flags = RTF_EXPIRES;
3334 } else {
3335 expires = 0;
3336 flags = 0;
3337 ifa_flags |= IFA_F_PERMANENT;
3338 }
3339
3340 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3341 if (addrconf_finite_timeout(timeout)) {
3342 if (timeout == 0)
3343 ifa_flags |= IFA_F_DEPRECATED;
3344 prefered_lft = timeout;
3345 }
3346
3347 spin_lock_bh(&ifp->lock);
3348 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3349 ifp->tstamp = jiffies;
3350 ifp->valid_lft = valid_lft;
3351 ifp->prefered_lft = prefered_lft;
3352
3353 spin_unlock_bh(&ifp->lock);
3354 if (!(ifp->flags&IFA_F_TENTATIVE))
3355 ipv6_ifa_notify(0, ifp);
3356
3357 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3358 expires, flags);
3359 addrconf_verify(0);
3360
3361 return 0;
3362 }
3363
3364 static int
3365 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3366 {
3367 struct net *net = sock_net(skb->sk);
3368 struct ifaddrmsg *ifm;
3369 struct nlattr *tb[IFA_MAX+1];
3370 struct in6_addr *pfx;
3371 struct inet6_ifaddr *ifa;
3372 struct net_device *dev;
3373 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3374 u8 ifa_flags;
3375 int err;
3376
3377 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3378 if (err < 0)
3379 return err;
3380
3381 ifm = nlmsg_data(nlh);
3382 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3383 if (pfx == NULL)
3384 return -EINVAL;
3385
3386 if (tb[IFA_CACHEINFO]) {
3387 struct ifa_cacheinfo *ci;
3388
3389 ci = nla_data(tb[IFA_CACHEINFO]);
3390 valid_lft = ci->ifa_valid;
3391 preferred_lft = ci->ifa_prefered;
3392 } else {
3393 preferred_lft = INFINITY_LIFE_TIME;
3394 valid_lft = INFINITY_LIFE_TIME;
3395 }
3396
3397 dev = __dev_get_by_index(net, ifm->ifa_index);
3398 if (dev == NULL)
3399 return -ENODEV;
3400
3401 /* We ignore other flags so far. */
3402 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3403
3404 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3405 if (ifa == NULL) {
3406 /*
3407 * It would be best to check for !NLM_F_CREATE here but
3408 * userspace alreay relies on not having to provide this.
3409 */
3410 return inet6_addr_add(net, ifm->ifa_index, pfx,
3411 ifm->ifa_prefixlen, ifa_flags,
3412 preferred_lft, valid_lft);
3413 }
3414
3415 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3416 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3417 err = -EEXIST;
3418 else
3419 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3420
3421 in6_ifa_put(ifa);
3422
3423 return err;
3424 }
3425
3426 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3427 u8 scope, int ifindex)
3428 {
3429 struct ifaddrmsg *ifm;
3430
3431 ifm = nlmsg_data(nlh);
3432 ifm->ifa_family = AF_INET6;
3433 ifm->ifa_prefixlen = prefixlen;
3434 ifm->ifa_flags = flags;
3435 ifm->ifa_scope = scope;
3436 ifm->ifa_index = ifindex;
3437 }
3438
3439 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3440 unsigned long tstamp, u32 preferred, u32 valid)
3441 {
3442 struct ifa_cacheinfo ci;
3443
3444 ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3445 + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3446 ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3447 + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3448 ci.ifa_prefered = preferred;
3449 ci.ifa_valid = valid;
3450
3451 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3452 }
3453
3454 static inline int rt_scope(int ifa_scope)
3455 {
3456 if (ifa_scope & IFA_HOST)
3457 return RT_SCOPE_HOST;
3458 else if (ifa_scope & IFA_LINK)
3459 return RT_SCOPE_LINK;
3460 else if (ifa_scope & IFA_SITE)
3461 return RT_SCOPE_SITE;
3462 else
3463 return RT_SCOPE_UNIVERSE;
3464 }
3465
3466 static inline int inet6_ifaddr_msgsize(void)
3467 {
3468 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3469 + nla_total_size(16) /* IFA_ADDRESS */
3470 + nla_total_size(sizeof(struct ifa_cacheinfo));
3471 }
3472
3473 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3474 u32 pid, u32 seq, int event, unsigned int flags)
3475 {
3476 struct nlmsghdr *nlh;
3477 u32 preferred, valid;
3478
3479 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3480 if (nlh == NULL)
3481 return -EMSGSIZE;
3482
3483 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3484 ifa->idev->dev->ifindex);
3485
3486 if (!(ifa->flags&IFA_F_PERMANENT)) {
3487 preferred = ifa->prefered_lft;
3488 valid = ifa->valid_lft;
3489 if (preferred != INFINITY_LIFE_TIME) {
3490 long tval = (jiffies - ifa->tstamp)/HZ;
3491 if (preferred > tval)
3492 preferred -= tval;
3493 else
3494 preferred = 0;
3495 if (valid != INFINITY_LIFE_TIME)
3496 valid -= tval;
3497 }
3498 } else {
3499 preferred = INFINITY_LIFE_TIME;
3500 valid = INFINITY_LIFE_TIME;
3501 }
3502
3503 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3504 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3505 nlmsg_cancel(skb, nlh);
3506 return -EMSGSIZE;
3507 }
3508
3509 return nlmsg_end(skb, nlh);
3510 }
3511
3512 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3513 u32 pid, u32 seq, int event, u16 flags)
3514 {
3515 struct nlmsghdr *nlh;
3516 u8 scope = RT_SCOPE_UNIVERSE;
3517 int ifindex = ifmca->idev->dev->ifindex;
3518
3519 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3520 scope = RT_SCOPE_SITE;
3521
3522 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3523 if (nlh == NULL)
3524 return -EMSGSIZE;
3525
3526 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3527 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3528 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3529 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3530 nlmsg_cancel(skb, nlh);
3531 return -EMSGSIZE;
3532 }
3533
3534 return nlmsg_end(skb, nlh);
3535 }
3536
3537 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3538 u32 pid, u32 seq, int event, unsigned int flags)
3539 {
3540 struct nlmsghdr *nlh;
3541 u8 scope = RT_SCOPE_UNIVERSE;
3542 int ifindex = ifaca->aca_idev->dev->ifindex;
3543
3544 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3545 scope = RT_SCOPE_SITE;
3546
3547 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3548 if (nlh == NULL)
3549 return -EMSGSIZE;
3550
3551 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3552 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3553 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3554 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3555 nlmsg_cancel(skb, nlh);
3556 return -EMSGSIZE;
3557 }
3558
3559 return nlmsg_end(skb, nlh);
3560 }
3561
3562 enum addr_type_t {
3563 UNICAST_ADDR,
3564 MULTICAST_ADDR,
3565 ANYCAST_ADDR,
3566 };
3567
3568 /* called with rcu_read_lock() */
3569 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3570 struct netlink_callback *cb, enum addr_type_t type,
3571 int s_ip_idx, int *p_ip_idx)
3572 {
3573 struct ifmcaddr6 *ifmca;
3574 struct ifacaddr6 *ifaca;
3575 int err = 1;
3576 int ip_idx = *p_ip_idx;
3577
3578 read_lock_bh(&idev->lock);
3579 switch (type) {
3580 case UNICAST_ADDR: {
3581 struct inet6_ifaddr *ifa;
3582
3583 /* unicast address incl. temp addr */
3584 list_for_each_entry(ifa, &idev->addr_list, if_list) {
3585 if (++ip_idx < s_ip_idx)
3586 continue;
3587 err = inet6_fill_ifaddr(skb, ifa,
3588 NETLINK_CB(cb->skb).pid,
3589 cb->nlh->nlmsg_seq,
3590 RTM_NEWADDR,
3591 NLM_F_MULTI);
3592 if (err <= 0)
3593 break;
3594 }
3595 break;
3596 }
3597 case MULTICAST_ADDR:
3598 /* multicast address */
3599 for (ifmca = idev->mc_list; ifmca;
3600 ifmca = ifmca->next, ip_idx++) {
3601 if (ip_idx < s_ip_idx)
3602 continue;
3603 err = inet6_fill_ifmcaddr(skb, ifmca,
3604 NETLINK_CB(cb->skb).pid,
3605 cb->nlh->nlmsg_seq,
3606 RTM_GETMULTICAST,
3607 NLM_F_MULTI);
3608 if (err <= 0)
3609 break;
3610 }
3611 break;
3612 case ANYCAST_ADDR:
3613 /* anycast address */
3614 for (ifaca = idev->ac_list; ifaca;
3615 ifaca = ifaca->aca_next, ip_idx++) {
3616 if (ip_idx < s_ip_idx)
3617 continue;
3618 err = inet6_fill_ifacaddr(skb, ifaca,
3619 NETLINK_CB(cb->skb).pid,
3620 cb->nlh->nlmsg_seq,
3621 RTM_GETANYCAST,
3622 NLM_F_MULTI);
3623 if (err <= 0)
3624 break;
3625 }
3626 break;
3627 default:
3628 break;
3629 }
3630 read_unlock_bh(&idev->lock);
3631 *p_ip_idx = ip_idx;
3632 return err;
3633 }
3634
3635 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3636 enum addr_type_t type)
3637 {
3638 struct net *net = sock_net(skb->sk);
3639 int h, s_h;
3640 int idx, ip_idx;
3641 int s_idx, s_ip_idx;
3642 struct net_device *dev;
3643 struct inet6_dev *idev;
3644 struct hlist_head *head;
3645 struct hlist_node *node;
3646
3647 s_h = cb->args[0];
3648 s_idx = idx = cb->args[1];
3649 s_ip_idx = ip_idx = cb->args[2];
3650
3651 rcu_read_lock();
3652 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3653 idx = 0;
3654 head = &net->dev_index_head[h];
3655 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3656 if (idx < s_idx)
3657 goto cont;
3658 if (h > s_h || idx > s_idx)
3659 s_ip_idx = 0;
3660 ip_idx = 0;
3661 idev = __in6_dev_get(dev);
3662 if (!idev)
3663 goto cont;
3664
3665 if (in6_dump_addrs(idev, skb, cb, type,
3666 s_ip_idx, &ip_idx) <= 0)
3667 goto done;
3668 cont:
3669 idx++;
3670 }
3671 }
3672 done:
3673 rcu_read_unlock();
3674 cb->args[0] = h;
3675 cb->args[1] = idx;
3676 cb->args[2] = ip_idx;
3677
3678 return skb->len;
3679 }
3680
3681 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3682 {
3683 enum addr_type_t type = UNICAST_ADDR;
3684
3685 return inet6_dump_addr(skb, cb, type);
3686 }
3687
3688 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3689 {
3690 enum addr_type_t type = MULTICAST_ADDR;
3691
3692 return inet6_dump_addr(skb, cb, type);
3693 }
3694
3695
3696 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3697 {
3698 enum addr_type_t type = ANYCAST_ADDR;
3699
3700 return inet6_dump_addr(skb, cb, type);
3701 }
3702
3703 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3704 void *arg)
3705 {
3706 struct net *net = sock_net(in_skb->sk);
3707 struct ifaddrmsg *ifm;
3708 struct nlattr *tb[IFA_MAX+1];
3709 struct in6_addr *addr = NULL;
3710 struct net_device *dev = NULL;
3711 struct inet6_ifaddr *ifa;
3712 struct sk_buff *skb;
3713 int err;
3714
3715 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3716 if (err < 0)
3717 goto errout;
3718
3719 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3720 if (addr == NULL) {
3721 err = -EINVAL;
3722 goto errout;
3723 }
3724
3725 ifm = nlmsg_data(nlh);
3726 if (ifm->ifa_index)
3727 dev = __dev_get_by_index(net, ifm->ifa_index);
3728
3729 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
3730 if (!ifa) {
3731 err = -EADDRNOTAVAIL;
3732 goto errout;
3733 }
3734
3735 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
3736 if (!skb) {
3737 err = -ENOBUFS;
3738 goto errout_ifa;
3739 }
3740
3741 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3742 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3743 if (err < 0) {
3744 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3745 WARN_ON(err == -EMSGSIZE);
3746 kfree_skb(skb);
3747 goto errout_ifa;
3748 }
3749 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
3750 errout_ifa:
3751 in6_ifa_put(ifa);
3752 errout:
3753 return err;
3754 }
3755
3756 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3757 {
3758 struct sk_buff *skb;
3759 struct net *net = dev_net(ifa->idev->dev);
3760 int err = -ENOBUFS;
3761
3762 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3763 if (skb == NULL)
3764 goto errout;
3765
3766 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3767 if (err < 0) {
3768 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3769 WARN_ON(err == -EMSGSIZE);
3770 kfree_skb(skb);
3771 goto errout;
3772 }
3773 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3774 return;
3775 errout:
3776 if (err < 0)
3777 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3778 }
3779
3780 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3781 __s32 *array, int bytes)
3782 {
3783 BUG_ON(bytes < (DEVCONF_MAX * 4));
3784
3785 memset(array, 0, bytes);
3786 array[DEVCONF_FORWARDING] = cnf->forwarding;
3787 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3788 array[DEVCONF_MTU6] = cnf->mtu6;
3789 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3790 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3791 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3792 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3793 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3794 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3795 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3796 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3797 #ifdef CONFIG_IPV6_PRIVACY
3798 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3799 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3800 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3801 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3802 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3803 #endif
3804 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3805 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3806 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3807 #ifdef CONFIG_IPV6_ROUTER_PREF
3808 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3809 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
3810 #ifdef CONFIG_IPV6_ROUTE_INFO
3811 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3812 #endif
3813 #endif
3814 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3815 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3816 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3817 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3818 #endif
3819 #ifdef CONFIG_IPV6_MROUTE
3820 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
3821 #endif
3822 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
3823 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
3824 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
3825 }
3826
3827 static inline size_t inet6_if_nlmsg_size(void)
3828 {
3829 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3830 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3831 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3832 + nla_total_size(4) /* IFLA_MTU */
3833 + nla_total_size(4) /* IFLA_LINK */
3834 + nla_total_size( /* IFLA_PROTINFO */
3835 nla_total_size(4) /* IFLA_INET6_FLAGS */
3836 + nla_total_size(sizeof(struct ifla_cacheinfo))
3837 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3838 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3839 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
3840 );
3841 }
3842
3843 static inline void __snmp6_fill_stats(u64 *stats, void __percpu **mib,
3844 int items, int bytes)
3845 {
3846 int i;
3847 int pad = bytes - sizeof(u64) * items;
3848 BUG_ON(pad < 0);
3849
3850 /* Use put_unaligned() because stats may not be aligned for u64. */
3851 put_unaligned(items, &stats[0]);
3852 for (i = 1; i < items; i++)
3853 put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3854
3855 memset(&stats[items], 0, pad);
3856 }
3857
3858 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3859 int bytes)
3860 {
3861 switch (attrtype) {
3862 case IFLA_INET6_STATS:
3863 __snmp6_fill_stats(stats, (void __percpu **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes);
3864 break;
3865 case IFLA_INET6_ICMP6STATS:
3866 __snmp6_fill_stats(stats, (void __percpu **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
3867 break;
3868 }
3869 }
3870
3871 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3872 u32 pid, u32 seq, int event, unsigned int flags)
3873 {
3874 struct net_device *dev = idev->dev;
3875 struct nlattr *nla;
3876 struct ifinfomsg *hdr;
3877 struct nlmsghdr *nlh;
3878 void *protoinfo;
3879 struct ifla_cacheinfo ci;
3880
3881 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3882 if (nlh == NULL)
3883 return -EMSGSIZE;
3884
3885 hdr = nlmsg_data(nlh);
3886 hdr->ifi_family = AF_INET6;
3887 hdr->__ifi_pad = 0;
3888 hdr->ifi_type = dev->type;
3889 hdr->ifi_index = dev->ifindex;
3890 hdr->ifi_flags = dev_get_flags(dev);
3891 hdr->ifi_change = 0;
3892
3893 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
3894
3895 if (dev->addr_len)
3896 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3897
3898 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
3899 if (dev->ifindex != dev->iflink)
3900 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
3901
3902 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3903 if (protoinfo == NULL)
3904 goto nla_put_failure;
3905
3906 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
3907
3908 ci.max_reasm_len = IPV6_MAXPLEN;
3909 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3910 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3911 ci.reachable_time = idev->nd_parms->reachable_time;
3912 ci.retrans_time = idev->nd_parms->retrans_time;
3913 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3914
3915 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3916 if (nla == NULL)
3917 goto nla_put_failure;
3918 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
3919
3920 /* XXX - MC not implemented */
3921
3922 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3923 if (nla == NULL)
3924 goto nla_put_failure;
3925 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3926
3927 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3928 if (nla == NULL)
3929 goto nla_put_failure;
3930 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
3931
3932 nla_nest_end(skb, protoinfo);
3933 return nlmsg_end(skb, nlh);
3934
3935 nla_put_failure:
3936 nlmsg_cancel(skb, nlh);
3937 return -EMSGSIZE;
3938 }
3939
3940 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3941 {
3942 struct net *net = sock_net(skb->sk);
3943 int h, s_h;
3944 int idx = 0, s_idx;
3945 struct net_device *dev;
3946 struct inet6_dev *idev;
3947 struct hlist_head *head;
3948 struct hlist_node *node;
3949
3950 s_h = cb->args[0];
3951 s_idx = cb->args[1];
3952
3953 rcu_read_lock();
3954 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3955 idx = 0;
3956 head = &net->dev_index_head[h];
3957 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3958 if (idx < s_idx)
3959 goto cont;
3960 idev = __in6_dev_get(dev);
3961 if (!idev)
3962 goto cont;
3963 if (inet6_fill_ifinfo(skb, idev,
3964 NETLINK_CB(cb->skb).pid,
3965 cb->nlh->nlmsg_seq,
3966 RTM_NEWLINK, NLM_F_MULTI) <= 0)
3967 goto out;
3968 cont:
3969 idx++;
3970 }
3971 }
3972 out:
3973 rcu_read_unlock();
3974 cb->args[1] = idx;
3975 cb->args[0] = h;
3976
3977 return skb->len;
3978 }
3979
3980 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3981 {
3982 struct sk_buff *skb;
3983 struct net *net = dev_net(idev->dev);
3984 int err = -ENOBUFS;
3985
3986 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
3987 if (skb == NULL)
3988 goto errout;
3989
3990 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
3991 if (err < 0) {
3992 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3993 WARN_ON(err == -EMSGSIZE);
3994 kfree_skb(skb);
3995 goto errout;
3996 }
3997 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3998 return;
3999 errout:
4000 if (err < 0)
4001 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
4002 }
4003
4004 static inline size_t inet6_prefix_nlmsg_size(void)
4005 {
4006 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4007 + nla_total_size(sizeof(struct in6_addr))
4008 + nla_total_size(sizeof(struct prefix_cacheinfo));
4009 }
4010
4011 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
4012 struct prefix_info *pinfo, u32 pid, u32 seq,
4013 int event, unsigned int flags)
4014 {
4015 struct prefixmsg *pmsg;
4016 struct nlmsghdr *nlh;
4017 struct prefix_cacheinfo ci;
4018
4019 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
4020 if (nlh == NULL)
4021 return -EMSGSIZE;
4022
4023 pmsg = nlmsg_data(nlh);
4024 pmsg->prefix_family = AF_INET6;
4025 pmsg->prefix_pad1 = 0;
4026 pmsg->prefix_pad2 = 0;
4027 pmsg->prefix_ifindex = idev->dev->ifindex;
4028 pmsg->prefix_len = pinfo->prefix_len;
4029 pmsg->prefix_type = pinfo->type;
4030 pmsg->prefix_pad3 = 0;
4031 pmsg->prefix_flags = 0;
4032 if (pinfo->onlink)
4033 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4034 if (pinfo->autoconf)
4035 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4036
4037 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
4038
4039 ci.preferred_time = ntohl(pinfo->prefered);
4040 ci.valid_time = ntohl(pinfo->valid);
4041 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
4042
4043 return nlmsg_end(skb, nlh);
4044
4045 nla_put_failure:
4046 nlmsg_cancel(skb, nlh);
4047 return -EMSGSIZE;
4048 }
4049
4050 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
4051 struct prefix_info *pinfo)
4052 {
4053 struct sk_buff *skb;
4054 struct net *net = dev_net(idev->dev);
4055 int err = -ENOBUFS;
4056
4057 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
4058 if (skb == NULL)
4059 goto errout;
4060
4061 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
4062 if (err < 0) {
4063 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4064 WARN_ON(err == -EMSGSIZE);
4065 kfree_skb(skb);
4066 goto errout;
4067 }
4068 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4069 return;
4070 errout:
4071 if (err < 0)
4072 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
4073 }
4074
4075 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4076 {
4077 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4078
4079 switch (event) {
4080 case RTM_NEWADDR:
4081 /*
4082 * If the address was optimistic
4083 * we inserted the route at the start of
4084 * our DAD process, so we don't need
4085 * to do it again
4086 */
4087 if (!(ifp->rt->rt6i_node))
4088 ip6_ins_rt(ifp->rt);
4089 if (ifp->idev->cnf.forwarding)
4090 addrconf_join_anycast(ifp);
4091 break;
4092 case RTM_DELADDR:
4093 if (ifp->idev->cnf.forwarding)
4094 addrconf_leave_anycast(ifp);
4095 addrconf_leave_solict(ifp->idev, &ifp->addr);
4096 dst_hold(&ifp->rt->u.dst);
4097
4098 if (ifp->state == INET6_IFADDR_STATE_DEAD &&
4099 ip6_del_rt(ifp->rt))
4100 dst_free(&ifp->rt->u.dst);
4101 break;
4102 }
4103 }
4104
4105 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4106 {
4107 rcu_read_lock_bh();
4108 if (likely(ifp->idev->dead == 0))
4109 __ipv6_ifa_notify(event, ifp);
4110 rcu_read_unlock_bh();
4111 }
4112
4113 #ifdef CONFIG_SYSCTL
4114
4115 static
4116 int addrconf_sysctl_forward(ctl_table *ctl, int write,
4117 void __user *buffer, size_t *lenp, loff_t *ppos)
4118 {
4119 int *valp = ctl->data;
4120 int val = *valp;
4121 loff_t pos = *ppos;
4122 int ret;
4123
4124 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
4125
4126 if (write)
4127 ret = addrconf_fixup_forwarding(ctl, valp, val);
4128 if (ret)
4129 *ppos = pos;
4130 return ret;
4131 }
4132
4133 static void dev_disable_change(struct inet6_dev *idev)
4134 {
4135 if (!idev || !idev->dev)
4136 return;
4137
4138 if (idev->cnf.disable_ipv6)
4139 addrconf_notify(NULL, NETDEV_DOWN, idev->dev);
4140 else
4141 addrconf_notify(NULL, NETDEV_UP, idev->dev);
4142 }
4143
4144 static void addrconf_disable_change(struct net *net, __s32 newf)
4145 {
4146 struct net_device *dev;
4147 struct inet6_dev *idev;
4148
4149 rcu_read_lock();
4150 for_each_netdev_rcu(net, dev) {
4151 idev = __in6_dev_get(dev);
4152 if (idev) {
4153 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4154 idev->cnf.disable_ipv6 = newf;
4155 if (changed)
4156 dev_disable_change(idev);
4157 }
4158 }
4159 rcu_read_unlock();
4160 }
4161
4162 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int old)
4163 {
4164 struct net *net;
4165
4166 net = (struct net *)table->extra2;
4167
4168 if (p == &net->ipv6.devconf_dflt->disable_ipv6)
4169 return 0;
4170
4171 if (!rtnl_trylock()) {
4172 /* Restore the original values before restarting */
4173 *p = old;
4174 return restart_syscall();
4175 }
4176
4177 if (p == &net->ipv6.devconf_all->disable_ipv6) {
4178 __s32 newf = net->ipv6.devconf_all->disable_ipv6;
4179 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4180 addrconf_disable_change(net, newf);
4181 } else if ((!*p) ^ (!old))
4182 dev_disable_change((struct inet6_dev *)table->extra1);
4183
4184 rtnl_unlock();
4185 return 0;
4186 }
4187
4188 static
4189 int addrconf_sysctl_disable(ctl_table *ctl, int write,
4190 void __user *buffer, size_t *lenp, loff_t *ppos)
4191 {
4192 int *valp = ctl->data;
4193 int val = *valp;
4194 loff_t pos = *ppos;
4195 int ret;
4196
4197 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
4198
4199 if (write)
4200 ret = addrconf_disable_ipv6(ctl, valp, val);
4201 if (ret)
4202 *ppos = pos;
4203 return ret;
4204 }
4205
4206 static struct addrconf_sysctl_table
4207 {
4208 struct ctl_table_header *sysctl_header;
4209 ctl_table addrconf_vars[DEVCONF_MAX+1];
4210 char *dev_name;
4211 } addrconf_sysctl __read_mostly = {
4212 .sysctl_header = NULL,
4213 .addrconf_vars = {
4214 {
4215 .procname = "forwarding",
4216 .data = &ipv6_devconf.forwarding,
4217 .maxlen = sizeof(int),
4218 .mode = 0644,
4219 .proc_handler = addrconf_sysctl_forward,
4220 },
4221 {
4222 .procname = "hop_limit",
4223 .data = &ipv6_devconf.hop_limit,
4224 .maxlen = sizeof(int),
4225 .mode = 0644,
4226 .proc_handler = proc_dointvec,
4227 },
4228 {
4229 .procname = "mtu",
4230 .data = &ipv6_devconf.mtu6,
4231 .maxlen = sizeof(int),
4232 .mode = 0644,
4233 .proc_handler = proc_dointvec,
4234 },
4235 {
4236 .procname = "accept_ra",
4237 .data = &ipv6_devconf.accept_ra,
4238 .maxlen = sizeof(int),
4239 .mode = 0644,
4240 .proc_handler = proc_dointvec,
4241 },
4242 {
4243 .procname = "accept_redirects",
4244 .data = &ipv6_devconf.accept_redirects,
4245 .maxlen = sizeof(int),
4246 .mode = 0644,
4247 .proc_handler = proc_dointvec,
4248 },
4249 {
4250 .procname = "autoconf",
4251 .data = &ipv6_devconf.autoconf,
4252 .maxlen = sizeof(int),
4253 .mode = 0644,
4254 .proc_handler = proc_dointvec,
4255 },
4256 {
4257 .procname = "dad_transmits",
4258 .data = &ipv6_devconf.dad_transmits,
4259 .maxlen = sizeof(int),
4260 .mode = 0644,
4261 .proc_handler = proc_dointvec,
4262 },
4263 {
4264 .procname = "router_solicitations",
4265 .data = &ipv6_devconf.rtr_solicits,
4266 .maxlen = sizeof(int),
4267 .mode = 0644,
4268 .proc_handler = proc_dointvec,
4269 },
4270 {
4271 .procname = "router_solicitation_interval",
4272 .data = &ipv6_devconf.rtr_solicit_interval,
4273 .maxlen = sizeof(int),
4274 .mode = 0644,
4275 .proc_handler = proc_dointvec_jiffies,
4276 },
4277 {
4278 .procname = "router_solicitation_delay",
4279 .data = &ipv6_devconf.rtr_solicit_delay,
4280 .maxlen = sizeof(int),
4281 .mode = 0644,
4282 .proc_handler = proc_dointvec_jiffies,
4283 },
4284 {
4285 .procname = "force_mld_version",
4286 .data = &ipv6_devconf.force_mld_version,
4287 .maxlen = sizeof(int),
4288 .mode = 0644,
4289 .proc_handler = proc_dointvec,
4290 },
4291 #ifdef CONFIG_IPV6_PRIVACY
4292 {
4293 .procname = "use_tempaddr",
4294 .data = &ipv6_devconf.use_tempaddr,
4295 .maxlen = sizeof(int),
4296 .mode = 0644,
4297 .proc_handler = proc_dointvec,
4298 },
4299 {
4300 .procname = "temp_valid_lft",
4301 .data = &ipv6_devconf.temp_valid_lft,
4302 .maxlen = sizeof(int),
4303 .mode = 0644,
4304 .proc_handler = proc_dointvec,
4305 },
4306 {
4307 .procname = "temp_prefered_lft",
4308 .data = &ipv6_devconf.temp_prefered_lft,
4309 .maxlen = sizeof(int),
4310 .mode = 0644,
4311 .proc_handler = proc_dointvec,
4312 },
4313 {
4314 .procname = "regen_max_retry",
4315 .data = &ipv6_devconf.regen_max_retry,
4316 .maxlen = sizeof(int),
4317 .mode = 0644,
4318 .proc_handler = proc_dointvec,
4319 },
4320 {
4321 .procname = "max_desync_factor",
4322 .data = &ipv6_devconf.max_desync_factor,
4323 .maxlen = sizeof(int),
4324 .mode = 0644,
4325 .proc_handler = proc_dointvec,
4326 },
4327 #endif
4328 {
4329 .procname = "max_addresses",
4330 .data = &ipv6_devconf.max_addresses,
4331 .maxlen = sizeof(int),
4332 .mode = 0644,
4333 .proc_handler = proc_dointvec,
4334 },
4335 {
4336 .procname = "accept_ra_defrtr",
4337 .data = &ipv6_devconf.accept_ra_defrtr,
4338 .maxlen = sizeof(int),
4339 .mode = 0644,
4340 .proc_handler = proc_dointvec,
4341 },
4342 {
4343 .procname = "accept_ra_pinfo",
4344 .data = &ipv6_devconf.accept_ra_pinfo,
4345 .maxlen = sizeof(int),
4346 .mode = 0644,
4347 .proc_handler = proc_dointvec,
4348 },
4349 #ifdef CONFIG_IPV6_ROUTER_PREF
4350 {
4351 .procname = "accept_ra_rtr_pref",
4352 .data = &ipv6_devconf.accept_ra_rtr_pref,
4353 .maxlen = sizeof(int),
4354 .mode = 0644,
4355 .proc_handler = proc_dointvec,
4356 },
4357 {
4358 .procname = "router_probe_interval",
4359 .data = &ipv6_devconf.rtr_probe_interval,
4360 .maxlen = sizeof(int),
4361 .mode = 0644,
4362 .proc_handler = proc_dointvec_jiffies,
4363 },
4364 #ifdef CONFIG_IPV6_ROUTE_INFO
4365 {
4366 .procname = "accept_ra_rt_info_max_plen",
4367 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4368 .maxlen = sizeof(int),
4369 .mode = 0644,
4370 .proc_handler = proc_dointvec,
4371 },
4372 #endif
4373 #endif
4374 {
4375 .procname = "proxy_ndp",
4376 .data = &ipv6_devconf.proxy_ndp,
4377 .maxlen = sizeof(int),
4378 .mode = 0644,
4379 .proc_handler = proc_dointvec,
4380 },
4381 {
4382 .procname = "accept_source_route",
4383 .data = &ipv6_devconf.accept_source_route,
4384 .maxlen = sizeof(int),
4385 .mode = 0644,
4386 .proc_handler = proc_dointvec,
4387 },
4388 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4389 {
4390 .procname = "optimistic_dad",
4391 .data = &ipv6_devconf.optimistic_dad,
4392 .maxlen = sizeof(int),
4393 .mode = 0644,
4394 .proc_handler = proc_dointvec,
4395
4396 },
4397 #endif
4398 #ifdef CONFIG_IPV6_MROUTE
4399 {
4400 .procname = "mc_forwarding",
4401 .data = &ipv6_devconf.mc_forwarding,
4402 .maxlen = sizeof(int),
4403 .mode = 0444,
4404 .proc_handler = proc_dointvec,
4405 },
4406 #endif
4407 {
4408 .procname = "disable_ipv6",
4409 .data = &ipv6_devconf.disable_ipv6,
4410 .maxlen = sizeof(int),
4411 .mode = 0644,
4412 .proc_handler = addrconf_sysctl_disable,
4413 },
4414 {
4415 .procname = "accept_dad",
4416 .data = &ipv6_devconf.accept_dad,
4417 .maxlen = sizeof(int),
4418 .mode = 0644,
4419 .proc_handler = proc_dointvec,
4420 },
4421 {
4422 .procname = "force_tllao",
4423 .data = &ipv6_devconf.force_tllao,
4424 .maxlen = sizeof(int),
4425 .mode = 0644,
4426 .proc_handler = proc_dointvec
4427 },
4428 {
4429 /* sentinel */
4430 }
4431 },
4432 };
4433
4434 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4435 struct inet6_dev *idev, struct ipv6_devconf *p)
4436 {
4437 int i;
4438 struct addrconf_sysctl_table *t;
4439
4440 #define ADDRCONF_CTL_PATH_DEV 3
4441
4442 struct ctl_path addrconf_ctl_path[] = {
4443 { .procname = "net", },
4444 { .procname = "ipv6", },
4445 { .procname = "conf", },
4446 { /* to be set */ },
4447 { },
4448 };
4449
4450
4451 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4452 if (t == NULL)
4453 goto out;
4454
4455 for (i = 0; t->addrconf_vars[i].data; i++) {
4456 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
4457 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4458 t->addrconf_vars[i].extra2 = net;
4459 }
4460
4461 /*
4462 * Make a copy of dev_name, because '.procname' is regarded as const
4463 * by sysctl and we wouldn't want anyone to change it under our feet
4464 * (see SIOCSIFNAME).
4465 */
4466 t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4467 if (!t->dev_name)
4468 goto free;
4469
4470 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
4471
4472 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
4473 t->addrconf_vars);
4474 if (t->sysctl_header == NULL)
4475 goto free_procname;
4476
4477 p->sysctl = t;
4478 return 0;
4479
4480 free_procname:
4481 kfree(t->dev_name);
4482 free:
4483 kfree(t);
4484 out:
4485 return -ENOBUFS;
4486 }
4487
4488 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4489 {
4490 struct addrconf_sysctl_table *t;
4491
4492 if (p->sysctl == NULL)
4493 return;
4494
4495 t = p->sysctl;
4496 p->sysctl = NULL;
4497 unregister_sysctl_table(t->sysctl_header);
4498 kfree(t->dev_name);
4499 kfree(t);
4500 }
4501
4502 static void addrconf_sysctl_register(struct inet6_dev *idev)
4503 {
4504 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
4505 &ndisc_ifinfo_sysctl_change);
4506 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
4507 idev, &idev->cnf);
4508 }
4509
4510 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
4511 {
4512 __addrconf_sysctl_unregister(&idev->cnf);
4513 neigh_sysctl_unregister(idev->nd_parms);
4514 }
4515
4516
4517 #endif
4518
4519 static int __net_init addrconf_init_net(struct net *net)
4520 {
4521 int err;
4522 struct ipv6_devconf *all, *dflt;
4523
4524 err = -ENOMEM;
4525 all = &ipv6_devconf;
4526 dflt = &ipv6_devconf_dflt;
4527
4528 if (!net_eq(net, &init_net)) {
4529 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4530 if (all == NULL)
4531 goto err_alloc_all;
4532
4533 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4534 if (dflt == NULL)
4535 goto err_alloc_dflt;
4536 } else {
4537 /* these will be inherited by all namespaces */
4538 dflt->autoconf = ipv6_defaults.autoconf;
4539 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
4540 }
4541
4542 net->ipv6.devconf_all = all;
4543 net->ipv6.devconf_dflt = dflt;
4544
4545 #ifdef CONFIG_SYSCTL
4546 err = __addrconf_sysctl_register(net, "all", NULL, all);
4547 if (err < 0)
4548 goto err_reg_all;
4549
4550 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
4551 if (err < 0)
4552 goto err_reg_dflt;
4553 #endif
4554 return 0;
4555
4556 #ifdef CONFIG_SYSCTL
4557 err_reg_dflt:
4558 __addrconf_sysctl_unregister(all);
4559 err_reg_all:
4560 kfree(dflt);
4561 #endif
4562 err_alloc_dflt:
4563 kfree(all);
4564 err_alloc_all:
4565 return err;
4566 }
4567
4568 static void __net_exit addrconf_exit_net(struct net *net)
4569 {
4570 #ifdef CONFIG_SYSCTL
4571 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4572 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4573 #endif
4574 if (!net_eq(net, &init_net)) {
4575 kfree(net->ipv6.devconf_dflt);
4576 kfree(net->ipv6.devconf_all);
4577 }
4578 }
4579
4580 static struct pernet_operations addrconf_ops = {
4581 .init = addrconf_init_net,
4582 .exit = addrconf_exit_net,
4583 };
4584
4585 /*
4586 * Device notifier
4587 */
4588
4589 int register_inet6addr_notifier(struct notifier_block *nb)
4590 {
4591 return atomic_notifier_chain_register(&inet6addr_chain, nb);
4592 }
4593 EXPORT_SYMBOL(register_inet6addr_notifier);
4594
4595 int unregister_inet6addr_notifier(struct notifier_block *nb)
4596 {
4597 return atomic_notifier_chain_unregister(&inet6addr_chain, nb);
4598 }
4599 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4600
4601 /*
4602 * Init / cleanup code
4603 */
4604
4605 int __init addrconf_init(void)
4606 {
4607 int i, err;
4608
4609 err = ipv6_addr_label_init();
4610 if (err < 0) {
4611 printk(KERN_CRIT "IPv6 Addrconf:"
4612 " cannot initialize default policy table: %d.\n", err);
4613 return err;
4614 }
4615
4616 register_pernet_subsys(&addrconf_ops);
4617
4618 /* The addrconf netdev notifier requires that loopback_dev
4619 * has it's ipv6 private information allocated and setup
4620 * before it can bring up and give link-local addresses
4621 * to other devices which are up.
4622 *
4623 * Unfortunately, loopback_dev is not necessarily the first
4624 * entry in the global dev_base list of net devices. In fact,
4625 * it is likely to be the very last entry on that list.
4626 * So this causes the notifier registry below to try and
4627 * give link-local addresses to all devices besides loopback_dev
4628 * first, then loopback_dev, which cases all the non-loopback_dev
4629 * devices to fail to get a link-local address.
4630 *
4631 * So, as a temporary fix, allocate the ipv6 structure for
4632 * loopback_dev first by hand.
4633 * Longer term, all of the dependencies ipv6 has upon the loopback
4634 * device and it being up should be removed.
4635 */
4636 rtnl_lock();
4637 if (!ipv6_add_dev(init_net.loopback_dev))
4638 err = -ENOMEM;
4639 rtnl_unlock();
4640 if (err)
4641 goto errlo;
4642
4643 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4644 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
4645
4646 register_netdevice_notifier(&ipv6_dev_notf);
4647
4648 addrconf_verify(0);
4649
4650 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4651 if (err < 0)
4652 goto errout;
4653
4654 /* Only the first call to __rtnl_register can fail */
4655 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4656 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4657 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4658 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4659 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4660
4661 ipv6_addr_label_rtnl_register();
4662
4663 return 0;
4664 errout:
4665 unregister_netdevice_notifier(&ipv6_dev_notf);
4666 errlo:
4667 unregister_pernet_subsys(&addrconf_ops);
4668
4669 return err;
4670 }
4671
4672 void addrconf_cleanup(void)
4673 {
4674 struct net_device *dev;
4675 int i;
4676
4677 unregister_netdevice_notifier(&ipv6_dev_notf);
4678 unregister_pernet_subsys(&addrconf_ops);
4679
4680 rtnl_lock();
4681
4682 /* clean dev list */
4683 for_each_netdev(&init_net, dev) {
4684 if (__in6_dev_get(dev) == NULL)
4685 continue;
4686 addrconf_ifdown(dev, 1);
4687 }
4688 addrconf_ifdown(init_net.loopback_dev, 2);
4689
4690 /*
4691 * Check hash table.
4692 */
4693 spin_lock_bh(&addrconf_hash_lock);
4694 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4695 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
4696 spin_unlock_bh(&addrconf_hash_lock);
4697
4698 del_timer(&addr_chk_timer);
4699 rtnl_unlock();
4700 }
kernel-based virtual machine