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net: Fix various endianness glitches
[deliverable/linux.git] / net / ipv6 / addrconf.c
1 /*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
9 * 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->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 init_timer(&ifa->timer);
652 INIT_HLIST_NODE(&ifa->addr_lst);
653 ifa->timer.data = (unsigned long) ifa;
654 ifa->scope = scope;
655 ifa->prefix_len = pfxlen;
656 ifa->flags = flags | IFA_F_TENTATIVE;
657 ifa->cstamp = ifa->tstamp = jiffies;
658
659 ifa->rt = rt;
660
661 /*
662 * part one of RFC 4429, section 3.3
663 * We should not configure an address as
664 * optimistic if we do not yet know the link
665 * layer address of our nexhop router
666 */
667
668 if (rt->rt6i_nexthop == NULL)
669 ifa->flags &= ~IFA_F_OPTIMISTIC;
670
671 ifa->idev = idev;
672 in6_dev_hold(idev);
673 /* For caller */
674 in6_ifa_hold(ifa);
675
676 /* Add to big hash table */
677 hash = ipv6_addr_hash(addr);
678
679 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
680 spin_unlock(&addrconf_hash_lock);
681
682 write_lock(&idev->lock);
683 /* Add to inet6_dev unicast addr list. */
684 ipv6_link_dev_addr(idev, ifa);
685
686 #ifdef CONFIG_IPV6_PRIVACY
687 if (ifa->flags&IFA_F_TEMPORARY) {
688 list_add(&ifa->tmp_list, &idev->tempaddr_list);
689 in6_ifa_hold(ifa);
690 }
691 #endif
692
693 in6_ifa_hold(ifa);
694 write_unlock(&idev->lock);
695 out2:
696 rcu_read_unlock_bh();
697
698 if (likely(err == 0))
699 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
700 else {
701 kfree(ifa);
702 ifa = ERR_PTR(err);
703 }
704
705 return ifa;
706 out:
707 spin_unlock(&addrconf_hash_lock);
708 goto out2;
709 }
710
711 /* This function wants to get referenced ifp and releases it before return */
712
713 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
714 {
715 struct inet6_ifaddr *ifa, *ifn;
716 struct inet6_dev *idev = ifp->idev;
717 int hash;
718 int deleted = 0, onlink = 0;
719 unsigned long expires = jiffies;
720
721 hash = ipv6_addr_hash(&ifp->addr);
722
723 ifp->dead = 1;
724
725 spin_lock_bh(&addrconf_hash_lock);
726 hlist_del_init_rcu(&ifp->addr_lst);
727 spin_unlock_bh(&addrconf_hash_lock);
728
729 write_lock_bh(&idev->lock);
730 #ifdef CONFIG_IPV6_PRIVACY
731 if (ifp->flags&IFA_F_TEMPORARY) {
732 list_del(&ifp->tmp_list);
733 if (ifp->ifpub) {
734 in6_ifa_put(ifp->ifpub);
735 ifp->ifpub = NULL;
736 }
737 __in6_ifa_put(ifp);
738 }
739 #endif
740
741 list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) {
742 if (ifa == ifp) {
743 list_del_init(&ifp->if_list);
744 __in6_ifa_put(ifp);
745
746 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
747 break;
748 deleted = 1;
749 continue;
750 } else if (ifp->flags & IFA_F_PERMANENT) {
751 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
752 ifp->prefix_len)) {
753 if (ifa->flags & IFA_F_PERMANENT) {
754 onlink = 1;
755 if (deleted)
756 break;
757 } else {
758 unsigned long lifetime;
759
760 if (!onlink)
761 onlink = -1;
762
763 spin_lock(&ifa->lock);
764
765 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
766 /*
767 * Note: Because this address is
768 * not permanent, lifetime <
769 * LONG_MAX / HZ here.
770 */
771 if (time_before(expires,
772 ifa->tstamp + lifetime * HZ))
773 expires = ifa->tstamp + lifetime * HZ;
774 spin_unlock(&ifa->lock);
775 }
776 }
777 }
778 }
779 write_unlock_bh(&idev->lock);
780
781 addrconf_del_timer(ifp);
782
783 ipv6_ifa_notify(RTM_DELADDR, ifp);
784
785 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
786
787 /*
788 * Purge or update corresponding prefix
789 *
790 * 1) we don't purge prefix here if address was not permanent.
791 * prefix is managed by its own lifetime.
792 * 2) if there're no addresses, delete prefix.
793 * 3) if there're still other permanent address(es),
794 * corresponding prefix is still permanent.
795 * 4) otherwise, update prefix lifetime to the
796 * longest valid lifetime among the corresponding
797 * addresses on the device.
798 * Note: subsequent RA will update lifetime.
799 *
800 * --yoshfuji
801 */
802 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
803 struct in6_addr prefix;
804 struct rt6_info *rt;
805 struct net *net = dev_net(ifp->idev->dev);
806 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
807 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1);
808
809 if (rt && addrconf_is_prefix_route(rt)) {
810 if (onlink == 0) {
811 ip6_del_rt(rt);
812 rt = NULL;
813 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
814 rt->rt6i_expires = expires;
815 rt->rt6i_flags |= RTF_EXPIRES;
816 }
817 }
818 dst_release(&rt->u.dst);
819 }
820
821 in6_ifa_put(ifp);
822 }
823
824 #ifdef CONFIG_IPV6_PRIVACY
825 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
826 {
827 struct inet6_dev *idev = ifp->idev;
828 struct in6_addr addr, *tmpaddr;
829 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
830 unsigned long regen_advance;
831 int tmp_plen;
832 int ret = 0;
833 int max_addresses;
834 u32 addr_flags;
835
836 write_lock(&idev->lock);
837 if (ift) {
838 spin_lock_bh(&ift->lock);
839 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
840 spin_unlock_bh(&ift->lock);
841 tmpaddr = &addr;
842 } else {
843 tmpaddr = NULL;
844 }
845 retry:
846 in6_dev_hold(idev);
847 if (idev->cnf.use_tempaddr <= 0) {
848 write_unlock(&idev->lock);
849 printk(KERN_INFO
850 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
851 in6_dev_put(idev);
852 ret = -1;
853 goto out;
854 }
855 spin_lock_bh(&ifp->lock);
856 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
857 idev->cnf.use_tempaddr = -1; /*XXX*/
858 spin_unlock_bh(&ifp->lock);
859 write_unlock(&idev->lock);
860 printk(KERN_WARNING
861 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
862 in6_dev_put(idev);
863 ret = -1;
864 goto out;
865 }
866 in6_ifa_hold(ifp);
867 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
868 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
869 spin_unlock_bh(&ifp->lock);
870 write_unlock(&idev->lock);
871 printk(KERN_WARNING
872 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
873 in6_ifa_put(ifp);
874 in6_dev_put(idev);
875 ret = -1;
876 goto out;
877 }
878 memcpy(&addr.s6_addr[8], idev->rndid, 8);
879 tmp_valid_lft = min_t(__u32,
880 ifp->valid_lft,
881 idev->cnf.temp_valid_lft);
882 tmp_prefered_lft = min_t(__u32,
883 ifp->prefered_lft,
884 idev->cnf.temp_prefered_lft - desync_factor / HZ);
885 tmp_plen = ifp->prefix_len;
886 max_addresses = idev->cnf.max_addresses;
887 tmp_cstamp = ifp->cstamp;
888 tmp_tstamp = ifp->tstamp;
889 spin_unlock_bh(&ifp->lock);
890
891 regen_advance = idev->cnf.regen_max_retry *
892 idev->cnf.dad_transmits *
893 idev->nd_parms->retrans_time / HZ;
894 write_unlock(&idev->lock);
895
896 /* A temporary address is created only if this calculated Preferred
897 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
898 * an implementation must not create a temporary address with a zero
899 * Preferred Lifetime.
900 */
901 if (tmp_prefered_lft <= regen_advance) {
902 in6_ifa_put(ifp);
903 in6_dev_put(idev);
904 ret = -1;
905 goto out;
906 }
907
908 addr_flags = IFA_F_TEMPORARY;
909 /* set in addrconf_prefix_rcv() */
910 if (ifp->flags & IFA_F_OPTIMISTIC)
911 addr_flags |= IFA_F_OPTIMISTIC;
912
913 ift = !max_addresses ||
914 ipv6_count_addresses(idev) < max_addresses ?
915 ipv6_add_addr(idev, &addr, tmp_plen,
916 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
917 addr_flags) : NULL;
918 if (!ift || IS_ERR(ift)) {
919 in6_ifa_put(ifp);
920 in6_dev_put(idev);
921 printk(KERN_INFO
922 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
923 tmpaddr = &addr;
924 write_lock(&idev->lock);
925 goto retry;
926 }
927
928 spin_lock_bh(&ift->lock);
929 ift->ifpub = ifp;
930 ift->valid_lft = tmp_valid_lft;
931 ift->prefered_lft = tmp_prefered_lft;
932 ift->cstamp = tmp_cstamp;
933 ift->tstamp = tmp_tstamp;
934 spin_unlock_bh(&ift->lock);
935
936 addrconf_dad_start(ift, 0);
937 in6_ifa_put(ift);
938 in6_dev_put(idev);
939 out:
940 return ret;
941 }
942 #endif
943
944 /*
945 * Choose an appropriate source address (RFC3484)
946 */
947 enum {
948 IPV6_SADDR_RULE_INIT = 0,
949 IPV6_SADDR_RULE_LOCAL,
950 IPV6_SADDR_RULE_SCOPE,
951 IPV6_SADDR_RULE_PREFERRED,
952 #ifdef CONFIG_IPV6_MIP6
953 IPV6_SADDR_RULE_HOA,
954 #endif
955 IPV6_SADDR_RULE_OIF,
956 IPV6_SADDR_RULE_LABEL,
957 #ifdef CONFIG_IPV6_PRIVACY
958 IPV6_SADDR_RULE_PRIVACY,
959 #endif
960 IPV6_SADDR_RULE_ORCHID,
961 IPV6_SADDR_RULE_PREFIX,
962 IPV6_SADDR_RULE_MAX
963 };
964
965 struct ipv6_saddr_score {
966 int rule;
967 int addr_type;
968 struct inet6_ifaddr *ifa;
969 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
970 int scopedist;
971 int matchlen;
972 };
973
974 struct ipv6_saddr_dst {
975 const struct in6_addr *addr;
976 int ifindex;
977 int scope;
978 int label;
979 unsigned int prefs;
980 };
981
982 static inline int ipv6_saddr_preferred(int type)
983 {
984 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
985 return 1;
986 return 0;
987 }
988
989 static int ipv6_get_saddr_eval(struct net *net,
990 struct ipv6_saddr_score *score,
991 struct ipv6_saddr_dst *dst,
992 int i)
993 {
994 int ret;
995
996 if (i <= score->rule) {
997 switch (i) {
998 case IPV6_SADDR_RULE_SCOPE:
999 ret = score->scopedist;
1000 break;
1001 case IPV6_SADDR_RULE_PREFIX:
1002 ret = score->matchlen;
1003 break;
1004 default:
1005 ret = !!test_bit(i, score->scorebits);
1006 }
1007 goto out;
1008 }
1009
1010 switch (i) {
1011 case IPV6_SADDR_RULE_INIT:
1012 /* Rule 0: remember if hiscore is not ready yet */
1013 ret = !!score->ifa;
1014 break;
1015 case IPV6_SADDR_RULE_LOCAL:
1016 /* Rule 1: Prefer same address */
1017 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1018 break;
1019 case IPV6_SADDR_RULE_SCOPE:
1020 /* Rule 2: Prefer appropriate scope
1021 *
1022 * ret
1023 * ^
1024 * -1 | d 15
1025 * ---+--+-+---> scope
1026 * |
1027 * | d is scope of the destination.
1028 * B-d | \
1029 * | \ <- smaller scope is better if
1030 * B-15 | \ if scope is enough for destinaion.
1031 * | ret = B - scope (-1 <= scope >= d <= 15).
1032 * d-C-1 | /
1033 * |/ <- greater is better
1034 * -C / if scope is not enough for destination.
1035 * /| ret = scope - C (-1 <= d < scope <= 15).
1036 *
1037 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1038 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1039 * Assume B = 0 and we get C > 29.
1040 */
1041 ret = __ipv6_addr_src_scope(score->addr_type);
1042 if (ret >= dst->scope)
1043 ret = -ret;
1044 else
1045 ret -= 128; /* 30 is enough */
1046 score->scopedist = ret;
1047 break;
1048 case IPV6_SADDR_RULE_PREFERRED:
1049 /* Rule 3: Avoid deprecated and optimistic addresses */
1050 ret = ipv6_saddr_preferred(score->addr_type) ||
1051 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1052 break;
1053 #ifdef CONFIG_IPV6_MIP6
1054 case IPV6_SADDR_RULE_HOA:
1055 {
1056 /* Rule 4: Prefer home address */
1057 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1058 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1059 break;
1060 }
1061 #endif
1062 case IPV6_SADDR_RULE_OIF:
1063 /* Rule 5: Prefer outgoing interface */
1064 ret = (!dst->ifindex ||
1065 dst->ifindex == score->ifa->idev->dev->ifindex);
1066 break;
1067 case IPV6_SADDR_RULE_LABEL:
1068 /* Rule 6: Prefer matching label */
1069 ret = ipv6_addr_label(net,
1070 &score->ifa->addr, score->addr_type,
1071 score->ifa->idev->dev->ifindex) == dst->label;
1072 break;
1073 #ifdef CONFIG_IPV6_PRIVACY
1074 case IPV6_SADDR_RULE_PRIVACY:
1075 {
1076 /* Rule 7: Prefer public address
1077 * Note: prefer temprary address if use_tempaddr >= 2
1078 */
1079 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1080 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1081 score->ifa->idev->cnf.use_tempaddr >= 2;
1082 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1083 break;
1084 }
1085 #endif
1086 case IPV6_SADDR_RULE_ORCHID:
1087 /* Rule 8-: Prefer ORCHID vs ORCHID or
1088 * non-ORCHID vs non-ORCHID
1089 */
1090 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1091 ipv6_addr_orchid(dst->addr));
1092 break;
1093 case IPV6_SADDR_RULE_PREFIX:
1094 /* Rule 8: Use longest matching prefix */
1095 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr,
1096 dst->addr);
1097 break;
1098 default:
1099 ret = 0;
1100 }
1101
1102 if (ret)
1103 __set_bit(i, score->scorebits);
1104 score->rule = i;
1105 out:
1106 return ret;
1107 }
1108
1109 int ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev,
1110 const struct in6_addr *daddr, unsigned int prefs,
1111 struct in6_addr *saddr)
1112 {
1113 struct ipv6_saddr_score scores[2],
1114 *score = &scores[0], *hiscore = &scores[1];
1115 struct ipv6_saddr_dst dst;
1116 struct net_device *dev;
1117 int dst_type;
1118
1119 dst_type = __ipv6_addr_type(daddr);
1120 dst.addr = daddr;
1121 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1122 dst.scope = __ipv6_addr_src_scope(dst_type);
1123 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1124 dst.prefs = prefs;
1125
1126 hiscore->rule = -1;
1127 hiscore->ifa = NULL;
1128
1129 rcu_read_lock();
1130
1131 for_each_netdev_rcu(net, dev) {
1132 struct inet6_dev *idev;
1133
1134 /* Candidate Source Address (section 4)
1135 * - multicast and link-local destination address,
1136 * the set of candidate source address MUST only
1137 * include addresses assigned to interfaces
1138 * belonging to the same link as the outgoing
1139 * interface.
1140 * (- For site-local destination addresses, the
1141 * set of candidate source addresses MUST only
1142 * include addresses assigned to interfaces
1143 * belonging to the same site as the outgoing
1144 * interface.)
1145 */
1146 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1147 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1148 dst.ifindex && dev->ifindex != dst.ifindex)
1149 continue;
1150
1151 idev = __in6_dev_get(dev);
1152 if (!idev)
1153 continue;
1154
1155 read_lock_bh(&idev->lock);
1156 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1157 int i;
1158
1159 /*
1160 * - Tentative Address (RFC2462 section 5.4)
1161 * - A tentative address is not considered
1162 * "assigned to an interface" in the traditional
1163 * sense, unless it is also flagged as optimistic.
1164 * - Candidate Source Address (section 4)
1165 * - In any case, anycast addresses, multicast
1166 * addresses, and the unspecified address MUST
1167 * NOT be included in a candidate set.
1168 */
1169 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1170 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1171 continue;
1172
1173 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1174
1175 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1176 score->addr_type & IPV6_ADDR_MULTICAST)) {
1177 LIMIT_NETDEBUG(KERN_DEBUG
1178 "ADDRCONF: unspecified / multicast address "
1179 "assigned as unicast address on %s",
1180 dev->name);
1181 continue;
1182 }
1183
1184 score->rule = -1;
1185 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1186
1187 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1188 int minihiscore, miniscore;
1189
1190 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1191 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1192
1193 if (minihiscore > miniscore) {
1194 if (i == IPV6_SADDR_RULE_SCOPE &&
1195 score->scopedist > 0) {
1196 /*
1197 * special case:
1198 * each remaining entry
1199 * has too small (not enough)
1200 * scope, because ifa entries
1201 * are sorted by their scope
1202 * values.
1203 */
1204 goto try_nextdev;
1205 }
1206 break;
1207 } else if (minihiscore < miniscore) {
1208 if (hiscore->ifa)
1209 in6_ifa_put(hiscore->ifa);
1210
1211 in6_ifa_hold(score->ifa);
1212
1213 swap(hiscore, score);
1214
1215 /* restore our iterator */
1216 score->ifa = hiscore->ifa;
1217
1218 break;
1219 }
1220 }
1221 }
1222 try_nextdev:
1223 read_unlock_bh(&idev->lock);
1224 }
1225 rcu_read_unlock();
1226
1227 if (!hiscore->ifa)
1228 return -EADDRNOTAVAIL;
1229
1230 ipv6_addr_copy(saddr, &hiscore->ifa->addr);
1231 in6_ifa_put(hiscore->ifa);
1232 return 0;
1233 }
1234 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1235
1236 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1237 unsigned char banned_flags)
1238 {
1239 struct inet6_dev *idev;
1240 int err = -EADDRNOTAVAIL;
1241
1242 rcu_read_lock();
1243 idev = __in6_dev_get(dev);
1244 if (idev) {
1245 struct inet6_ifaddr *ifp;
1246
1247 read_lock_bh(&idev->lock);
1248 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1249 if (ifp->scope == IFA_LINK &&
1250 !(ifp->flags & banned_flags)) {
1251 ipv6_addr_copy(addr, &ifp->addr);
1252 err = 0;
1253 break;
1254 }
1255 }
1256 read_unlock_bh(&idev->lock);
1257 }
1258 rcu_read_unlock();
1259 return err;
1260 }
1261
1262 static int ipv6_count_addresses(struct inet6_dev *idev)
1263 {
1264 int cnt = 0;
1265 struct inet6_ifaddr *ifp;
1266
1267 read_lock_bh(&idev->lock);
1268 list_for_each_entry(ifp, &idev->addr_list, if_list)
1269 cnt++;
1270 read_unlock_bh(&idev->lock);
1271 return cnt;
1272 }
1273
1274 int ipv6_chk_addr(struct net *net, struct in6_addr *addr,
1275 struct net_device *dev, int strict)
1276 {
1277 struct inet6_ifaddr *ifp = NULL;
1278 struct hlist_node *node;
1279 unsigned int hash = ipv6_addr_hash(addr);
1280
1281 rcu_read_lock_bh();
1282 hlist_for_each_entry_rcu(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1283 if (!net_eq(dev_net(ifp->idev->dev), net))
1284 continue;
1285 if (ipv6_addr_equal(&ifp->addr, addr) &&
1286 !(ifp->flags&IFA_F_TENTATIVE)) {
1287 if (dev == NULL || ifp->idev->dev == dev ||
1288 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1289 break;
1290 }
1291 }
1292 rcu_read_unlock_bh();
1293
1294 return ifp != NULL;
1295 }
1296 EXPORT_SYMBOL(ipv6_chk_addr);
1297
1298 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1299 struct net_device *dev)
1300 {
1301 unsigned int hash = ipv6_addr_hash(addr);
1302 struct inet6_ifaddr *ifp;
1303 struct hlist_node *node;
1304
1305 hlist_for_each_entry(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1306 if (!net_eq(dev_net(ifp->idev->dev), net))
1307 continue;
1308 if (ipv6_addr_equal(&ifp->addr, addr)) {
1309 if (dev == NULL || ifp->idev->dev == dev)
1310 return true;
1311 }
1312 }
1313 return false;
1314 }
1315
1316 int ipv6_chk_prefix(struct in6_addr *addr, struct net_device *dev)
1317 {
1318 struct inet6_dev *idev;
1319 struct inet6_ifaddr *ifa;
1320 int onlink;
1321
1322 onlink = 0;
1323 rcu_read_lock();
1324 idev = __in6_dev_get(dev);
1325 if (idev) {
1326 read_lock_bh(&idev->lock);
1327 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1328 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1329 ifa->prefix_len);
1330 if (onlink)
1331 break;
1332 }
1333 read_unlock_bh(&idev->lock);
1334 }
1335 rcu_read_unlock();
1336 return onlink;
1337 }
1338
1339 EXPORT_SYMBOL(ipv6_chk_prefix);
1340
1341 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1342 struct net_device *dev, int strict)
1343 {
1344 struct inet6_ifaddr *ifp, *result = NULL;
1345 unsigned int hash = ipv6_addr_hash(addr);
1346 struct hlist_node *node;
1347
1348 rcu_read_lock_bh();
1349 hlist_for_each_entry_rcu(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1350 if (!net_eq(dev_net(ifp->idev->dev), net))
1351 continue;
1352 if (ipv6_addr_equal(&ifp->addr, addr)) {
1353 if (dev == NULL || ifp->idev->dev == dev ||
1354 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1355 result = ifp;
1356 in6_ifa_hold(ifp);
1357 break;
1358 }
1359 }
1360 }
1361 rcu_read_unlock_bh();
1362
1363 return result;
1364 }
1365
1366 /* Gets referenced address, destroys ifaddr */
1367
1368 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1369 {
1370 if (ifp->flags&IFA_F_PERMANENT) {
1371 spin_lock_bh(&ifp->lock);
1372 addrconf_del_timer(ifp);
1373 ifp->flags |= IFA_F_TENTATIVE;
1374 if (dad_failed)
1375 ifp->flags |= IFA_F_DADFAILED;
1376 spin_unlock_bh(&ifp->lock);
1377 if (dad_failed)
1378 ipv6_ifa_notify(0, ifp);
1379 in6_ifa_put(ifp);
1380 #ifdef CONFIG_IPV6_PRIVACY
1381 } else if (ifp->flags&IFA_F_TEMPORARY) {
1382 struct inet6_ifaddr *ifpub;
1383 spin_lock_bh(&ifp->lock);
1384 ifpub = ifp->ifpub;
1385 if (ifpub) {
1386 in6_ifa_hold(ifpub);
1387 spin_unlock_bh(&ifp->lock);
1388 ipv6_create_tempaddr(ifpub, ifp);
1389 in6_ifa_put(ifpub);
1390 } else {
1391 spin_unlock_bh(&ifp->lock);
1392 }
1393 ipv6_del_addr(ifp);
1394 #endif
1395 } else
1396 ipv6_del_addr(ifp);
1397 }
1398
1399 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1400 {
1401 struct inet6_dev *idev = ifp->idev;
1402
1403 if (net_ratelimit())
1404 printk(KERN_INFO "%s: IPv6 duplicate address %pI6c detected!\n",
1405 ifp->idev->dev->name, &ifp->addr);
1406
1407 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1408 struct in6_addr addr;
1409
1410 addr.s6_addr32[0] = htonl(0xfe800000);
1411 addr.s6_addr32[1] = 0;
1412
1413 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1414 ipv6_addr_equal(&ifp->addr, &addr)) {
1415 /* DAD failed for link-local based on MAC address */
1416 idev->cnf.disable_ipv6 = 1;
1417
1418 printk(KERN_INFO "%s: IPv6 being disabled!\n",
1419 ifp->idev->dev->name);
1420 }
1421 }
1422
1423 addrconf_dad_stop(ifp, 1);
1424 }
1425
1426 /* Join to solicited addr multicast group. */
1427
1428 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1429 {
1430 struct in6_addr maddr;
1431
1432 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1433 return;
1434
1435 addrconf_addr_solict_mult(addr, &maddr);
1436 ipv6_dev_mc_inc(dev, &maddr);
1437 }
1438
1439 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1440 {
1441 struct in6_addr maddr;
1442
1443 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1444 return;
1445
1446 addrconf_addr_solict_mult(addr, &maddr);
1447 __ipv6_dev_mc_dec(idev, &maddr);
1448 }
1449
1450 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1451 {
1452 struct in6_addr addr;
1453 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1454 if (ipv6_addr_any(&addr))
1455 return;
1456 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1457 }
1458
1459 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1460 {
1461 struct in6_addr addr;
1462 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1463 if (ipv6_addr_any(&addr))
1464 return;
1465 __ipv6_dev_ac_dec(ifp->idev, &addr);
1466 }
1467
1468 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1469 {
1470 if (dev->addr_len != ETH_ALEN)
1471 return -1;
1472 memcpy(eui, dev->dev_addr, 3);
1473 memcpy(eui + 5, dev->dev_addr + 3, 3);
1474
1475 /*
1476 * The zSeries OSA network cards can be shared among various
1477 * OS instances, but the OSA cards have only one MAC address.
1478 * This leads to duplicate address conflicts in conjunction
1479 * with IPv6 if more than one instance uses the same card.
1480 *
1481 * The driver for these cards can deliver a unique 16-bit
1482 * identifier for each instance sharing the same card. It is
1483 * placed instead of 0xFFFE in the interface identifier. The
1484 * "u" bit of the interface identifier is not inverted in this
1485 * case. Hence the resulting interface identifier has local
1486 * scope according to RFC2373.
1487 */
1488 if (dev->dev_id) {
1489 eui[3] = (dev->dev_id >> 8) & 0xFF;
1490 eui[4] = dev->dev_id & 0xFF;
1491 } else {
1492 eui[3] = 0xFF;
1493 eui[4] = 0xFE;
1494 eui[0] ^= 2;
1495 }
1496 return 0;
1497 }
1498
1499 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1500 {
1501 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1502 if (dev->addr_len != ARCNET_ALEN)
1503 return -1;
1504 memset(eui, 0, 7);
1505 eui[7] = *(u8*)dev->dev_addr;
1506 return 0;
1507 }
1508
1509 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1510 {
1511 if (dev->addr_len != INFINIBAND_ALEN)
1512 return -1;
1513 memcpy(eui, dev->dev_addr + 12, 8);
1514 eui[0] |= 2;
1515 return 0;
1516 }
1517
1518 int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1519 {
1520 if (addr == 0)
1521 return -1;
1522 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1523 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1524 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1525 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1526 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1527 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1528 eui[1] = 0;
1529 eui[2] = 0x5E;
1530 eui[3] = 0xFE;
1531 memcpy(eui + 4, &addr, 4);
1532 return 0;
1533 }
1534 EXPORT_SYMBOL(__ipv6_isatap_ifid);
1535
1536 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1537 {
1538 if (dev->priv_flags & IFF_ISATAP)
1539 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1540 return -1;
1541 }
1542
1543 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1544 {
1545 switch (dev->type) {
1546 case ARPHRD_ETHER:
1547 case ARPHRD_FDDI:
1548 case ARPHRD_IEEE802_TR:
1549 return addrconf_ifid_eui48(eui, dev);
1550 case ARPHRD_ARCNET:
1551 return addrconf_ifid_arcnet(eui, dev);
1552 case ARPHRD_INFINIBAND:
1553 return addrconf_ifid_infiniband(eui, dev);
1554 case ARPHRD_SIT:
1555 return addrconf_ifid_sit(eui, dev);
1556 }
1557 return -1;
1558 }
1559
1560 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1561 {
1562 int err = -1;
1563 struct inet6_ifaddr *ifp;
1564
1565 read_lock_bh(&idev->lock);
1566 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1567 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1568 memcpy(eui, ifp->addr.s6_addr+8, 8);
1569 err = 0;
1570 break;
1571 }
1572 }
1573 read_unlock_bh(&idev->lock);
1574 return err;
1575 }
1576
1577 #ifdef CONFIG_IPV6_PRIVACY
1578 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1579 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1580 {
1581 regen:
1582 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1583 idev->rndid[0] &= ~0x02;
1584
1585 /*
1586 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1587 * check if generated address is not inappropriate
1588 *
1589 * - Reserved subnet anycast (RFC 2526)
1590 * 11111101 11....11 1xxxxxxx
1591 * - ISATAP (RFC4214) 6.1
1592 * 00-00-5E-FE-xx-xx-xx-xx
1593 * - value 0
1594 * - XXX: already assigned to an address on the device
1595 */
1596 if (idev->rndid[0] == 0xfd &&
1597 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1598 (idev->rndid[7]&0x80))
1599 goto regen;
1600 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1601 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1602 goto regen;
1603 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1604 goto regen;
1605 }
1606
1607 return 0;
1608 }
1609
1610 static void ipv6_regen_rndid(unsigned long data)
1611 {
1612 struct inet6_dev *idev = (struct inet6_dev *) data;
1613 unsigned long expires;
1614
1615 rcu_read_lock_bh();
1616 write_lock_bh(&idev->lock);
1617
1618 if (idev->dead)
1619 goto out;
1620
1621 if (__ipv6_regen_rndid(idev) < 0)
1622 goto out;
1623
1624 expires = jiffies +
1625 idev->cnf.temp_prefered_lft * HZ -
1626 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1627 if (time_before(expires, jiffies)) {
1628 printk(KERN_WARNING
1629 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1630 idev->dev->name);
1631 goto out;
1632 }
1633
1634 if (!mod_timer(&idev->regen_timer, expires))
1635 in6_dev_hold(idev);
1636
1637 out:
1638 write_unlock_bh(&idev->lock);
1639 rcu_read_unlock_bh();
1640 in6_dev_put(idev);
1641 }
1642
1643 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1644 int ret = 0;
1645
1646 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1647 ret = __ipv6_regen_rndid(idev);
1648 return ret;
1649 }
1650 #endif
1651
1652 /*
1653 * Add prefix route.
1654 */
1655
1656 static void
1657 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1658 unsigned long expires, u32 flags)
1659 {
1660 struct fib6_config cfg = {
1661 .fc_table = RT6_TABLE_PREFIX,
1662 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1663 .fc_ifindex = dev->ifindex,
1664 .fc_expires = expires,
1665 .fc_dst_len = plen,
1666 .fc_flags = RTF_UP | flags,
1667 .fc_nlinfo.nl_net = dev_net(dev),
1668 .fc_protocol = RTPROT_KERNEL,
1669 };
1670
1671 ipv6_addr_copy(&cfg.fc_dst, pfx);
1672
1673 /* Prevent useless cloning on PtP SIT.
1674 This thing is done here expecting that the whole
1675 class of non-broadcast devices need not cloning.
1676 */
1677 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1678 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1679 cfg.fc_flags |= RTF_NONEXTHOP;
1680 #endif
1681
1682 ip6_route_add(&cfg);
1683 }
1684
1685 /* Create "default" multicast route to the interface */
1686
1687 static void addrconf_add_mroute(struct net_device *dev)
1688 {
1689 struct fib6_config cfg = {
1690 .fc_table = RT6_TABLE_LOCAL,
1691 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1692 .fc_ifindex = dev->ifindex,
1693 .fc_dst_len = 8,
1694 .fc_flags = RTF_UP,
1695 .fc_nlinfo.nl_net = dev_net(dev),
1696 };
1697
1698 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1699
1700 ip6_route_add(&cfg);
1701 }
1702
1703 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1704 static void sit_route_add(struct net_device *dev)
1705 {
1706 struct fib6_config cfg = {
1707 .fc_table = RT6_TABLE_MAIN,
1708 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1709 .fc_ifindex = dev->ifindex,
1710 .fc_dst_len = 96,
1711 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1712 .fc_nlinfo.nl_net = dev_net(dev),
1713 };
1714
1715 /* prefix length - 96 bits "::d.d.d.d" */
1716 ip6_route_add(&cfg);
1717 }
1718 #endif
1719
1720 static void addrconf_add_lroute(struct net_device *dev)
1721 {
1722 struct in6_addr addr;
1723
1724 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1725 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1726 }
1727
1728 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1729 {
1730 struct inet6_dev *idev;
1731
1732 ASSERT_RTNL();
1733
1734 idev = ipv6_find_idev(dev);
1735 if (!idev)
1736 return NULL;
1737
1738 /* Add default multicast route */
1739 addrconf_add_mroute(dev);
1740
1741 /* Add link local route */
1742 addrconf_add_lroute(dev);
1743 return idev;
1744 }
1745
1746 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1747 {
1748 struct prefix_info *pinfo;
1749 __u32 valid_lft;
1750 __u32 prefered_lft;
1751 int addr_type;
1752 struct inet6_dev *in6_dev;
1753 struct net *net = dev_net(dev);
1754
1755 pinfo = (struct prefix_info *) opt;
1756
1757 if (len < sizeof(struct prefix_info)) {
1758 ADBG(("addrconf: prefix option too short\n"));
1759 return;
1760 }
1761
1762 /*
1763 * Validation checks ([ADDRCONF], page 19)
1764 */
1765
1766 addr_type = ipv6_addr_type(&pinfo->prefix);
1767
1768 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1769 return;
1770
1771 valid_lft = ntohl(pinfo->valid);
1772 prefered_lft = ntohl(pinfo->prefered);
1773
1774 if (prefered_lft > valid_lft) {
1775 if (net_ratelimit())
1776 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1777 return;
1778 }
1779
1780 in6_dev = in6_dev_get(dev);
1781
1782 if (in6_dev == NULL) {
1783 if (net_ratelimit())
1784 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1785 return;
1786 }
1787
1788 /*
1789 * Two things going on here:
1790 * 1) Add routes for on-link prefixes
1791 * 2) Configure prefixes with the auto flag set
1792 */
1793
1794 if (pinfo->onlink) {
1795 struct rt6_info *rt;
1796 unsigned long rt_expires;
1797
1798 /* Avoid arithmetic overflow. Really, we could
1799 * save rt_expires in seconds, likely valid_lft,
1800 * but it would require division in fib gc, that it
1801 * not good.
1802 */
1803 if (HZ > USER_HZ)
1804 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
1805 else
1806 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
1807
1808 if (addrconf_finite_timeout(rt_expires))
1809 rt_expires *= HZ;
1810
1811 rt = rt6_lookup(net, &pinfo->prefix, NULL,
1812 dev->ifindex, 1);
1813
1814 if (rt && addrconf_is_prefix_route(rt)) {
1815 /* Autoconf prefix route */
1816 if (valid_lft == 0) {
1817 ip6_del_rt(rt);
1818 rt = NULL;
1819 } else if (addrconf_finite_timeout(rt_expires)) {
1820 /* not infinity */
1821 rt->rt6i_expires = jiffies + rt_expires;
1822 rt->rt6i_flags |= RTF_EXPIRES;
1823 } else {
1824 rt->rt6i_flags &= ~RTF_EXPIRES;
1825 rt->rt6i_expires = 0;
1826 }
1827 } else if (valid_lft) {
1828 clock_t expires = 0;
1829 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
1830 if (addrconf_finite_timeout(rt_expires)) {
1831 /* not infinity */
1832 flags |= RTF_EXPIRES;
1833 expires = jiffies_to_clock_t(rt_expires);
1834 }
1835 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1836 dev, expires, flags);
1837 }
1838 if (rt)
1839 dst_release(&rt->u.dst);
1840 }
1841
1842 /* Try to figure out our local address for this prefix */
1843
1844 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1845 struct inet6_ifaddr * ifp;
1846 struct in6_addr addr;
1847 int create = 0, update_lft = 0;
1848
1849 if (pinfo->prefix_len == 64) {
1850 memcpy(&addr, &pinfo->prefix, 8);
1851 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1852 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1853 in6_dev_put(in6_dev);
1854 return;
1855 }
1856 goto ok;
1857 }
1858 if (net_ratelimit())
1859 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1860 pinfo->prefix_len);
1861 in6_dev_put(in6_dev);
1862 return;
1863
1864 ok:
1865
1866 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1867
1868 if (ifp == NULL && valid_lft) {
1869 int max_addresses = in6_dev->cnf.max_addresses;
1870 u32 addr_flags = 0;
1871
1872 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1873 if (in6_dev->cnf.optimistic_dad &&
1874 !net->ipv6.devconf_all->forwarding)
1875 addr_flags = IFA_F_OPTIMISTIC;
1876 #endif
1877
1878 /* Do not allow to create too much of autoconfigured
1879 * addresses; this would be too easy way to crash kernel.
1880 */
1881 if (!max_addresses ||
1882 ipv6_count_addresses(in6_dev) < max_addresses)
1883 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1884 addr_type&IPV6_ADDR_SCOPE_MASK,
1885 addr_flags);
1886
1887 if (!ifp || IS_ERR(ifp)) {
1888 in6_dev_put(in6_dev);
1889 return;
1890 }
1891
1892 update_lft = create = 1;
1893 ifp->cstamp = jiffies;
1894 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1895 }
1896
1897 if (ifp) {
1898 int flags;
1899 unsigned long now;
1900 #ifdef CONFIG_IPV6_PRIVACY
1901 struct inet6_ifaddr *ift;
1902 #endif
1903 u32 stored_lft;
1904
1905 /* update lifetime (RFC2462 5.5.3 e) */
1906 spin_lock(&ifp->lock);
1907 now = jiffies;
1908 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1909 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1910 else
1911 stored_lft = 0;
1912 if (!update_lft && stored_lft) {
1913 if (valid_lft > MIN_VALID_LIFETIME ||
1914 valid_lft > stored_lft)
1915 update_lft = 1;
1916 else if (stored_lft <= MIN_VALID_LIFETIME) {
1917 /* valid_lft <= stored_lft is always true */
1918 /*
1919 * RFC 4862 Section 5.5.3e:
1920 * "Note that the preferred lifetime of
1921 * the corresponding address is always
1922 * reset to the Preferred Lifetime in
1923 * the received Prefix Information
1924 * option, regardless of whether the
1925 * valid lifetime is also reset or
1926 * ignored."
1927 *
1928 * So if the preferred lifetime in
1929 * this advertisement is different
1930 * than what we have stored, but the
1931 * valid lifetime is invalid, just
1932 * reset prefered_lft.
1933 *
1934 * We must set the valid lifetime
1935 * to the stored lifetime since we'll
1936 * be updating the timestamp below,
1937 * else we'll set it back to the
1938 * minumum.
1939 */
1940 if (prefered_lft != ifp->prefered_lft) {
1941 valid_lft = stored_lft;
1942 update_lft = 1;
1943 }
1944 } else {
1945 valid_lft = MIN_VALID_LIFETIME;
1946 if (valid_lft < prefered_lft)
1947 prefered_lft = valid_lft;
1948 update_lft = 1;
1949 }
1950 }
1951
1952 if (update_lft) {
1953 ifp->valid_lft = valid_lft;
1954 ifp->prefered_lft = prefered_lft;
1955 ifp->tstamp = now;
1956 flags = ifp->flags;
1957 ifp->flags &= ~IFA_F_DEPRECATED;
1958 spin_unlock(&ifp->lock);
1959
1960 if (!(flags&IFA_F_TENTATIVE))
1961 ipv6_ifa_notify(0, ifp);
1962 } else
1963 spin_unlock(&ifp->lock);
1964
1965 #ifdef CONFIG_IPV6_PRIVACY
1966 read_lock_bh(&in6_dev->lock);
1967 /* update all temporary addresses in the list */
1968 list_for_each_entry(ift, &in6_dev->tempaddr_list, tmp_list) {
1969 /*
1970 * When adjusting the lifetimes of an existing
1971 * temporary address, only lower the lifetimes.
1972 * Implementations must not increase the
1973 * lifetimes of an existing temporary address
1974 * when processing a Prefix Information Option.
1975 */
1976 if (ifp != ift->ifpub)
1977 continue;
1978
1979 spin_lock(&ift->lock);
1980 flags = ift->flags;
1981 if (ift->valid_lft > valid_lft &&
1982 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1983 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1984 if (ift->prefered_lft > prefered_lft &&
1985 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1986 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1987 spin_unlock(&ift->lock);
1988 if (!(flags&IFA_F_TENTATIVE))
1989 ipv6_ifa_notify(0, ift);
1990 }
1991
1992 if (create && in6_dev->cnf.use_tempaddr > 0) {
1993 /*
1994 * When a new public address is created as described in [ADDRCONF],
1995 * also create a new temporary address.
1996 */
1997 read_unlock_bh(&in6_dev->lock);
1998 ipv6_create_tempaddr(ifp, NULL);
1999 } else {
2000 read_unlock_bh(&in6_dev->lock);
2001 }
2002 #endif
2003 in6_ifa_put(ifp);
2004 addrconf_verify(0);
2005 }
2006 }
2007 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2008 in6_dev_put(in6_dev);
2009 }
2010
2011 /*
2012 * Set destination address.
2013 * Special case for SIT interfaces where we create a new "virtual"
2014 * device.
2015 */
2016 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2017 {
2018 struct in6_ifreq ireq;
2019 struct net_device *dev;
2020 int err = -EINVAL;
2021
2022 rtnl_lock();
2023
2024 err = -EFAULT;
2025 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2026 goto err_exit;
2027
2028 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2029
2030 err = -ENODEV;
2031 if (dev == NULL)
2032 goto err_exit;
2033
2034 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2035 if (dev->type == ARPHRD_SIT) {
2036 const struct net_device_ops *ops = dev->netdev_ops;
2037 struct ifreq ifr;
2038 struct ip_tunnel_parm p;
2039
2040 err = -EADDRNOTAVAIL;
2041 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2042 goto err_exit;
2043
2044 memset(&p, 0, sizeof(p));
2045 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2046 p.iph.saddr = 0;
2047 p.iph.version = 4;
2048 p.iph.ihl = 5;
2049 p.iph.protocol = IPPROTO_IPV6;
2050 p.iph.ttl = 64;
2051 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2052
2053 if (ops->ndo_do_ioctl) {
2054 mm_segment_t oldfs = get_fs();
2055
2056 set_fs(KERNEL_DS);
2057 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2058 set_fs(oldfs);
2059 } else
2060 err = -EOPNOTSUPP;
2061
2062 if (err == 0) {
2063 err = -ENOBUFS;
2064 dev = __dev_get_by_name(net, p.name);
2065 if (!dev)
2066 goto err_exit;
2067 err = dev_open(dev);
2068 }
2069 }
2070 #endif
2071
2072 err_exit:
2073 rtnl_unlock();
2074 return err;
2075 }
2076
2077 /*
2078 * Manual configuration of address on an interface
2079 */
2080 static int inet6_addr_add(struct net *net, int ifindex, struct in6_addr *pfx,
2081 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
2082 __u32 valid_lft)
2083 {
2084 struct inet6_ifaddr *ifp;
2085 struct inet6_dev *idev;
2086 struct net_device *dev;
2087 int scope;
2088 u32 flags;
2089 clock_t expires;
2090 unsigned long timeout;
2091
2092 ASSERT_RTNL();
2093
2094 if (plen > 128)
2095 return -EINVAL;
2096
2097 /* check the lifetime */
2098 if (!valid_lft || prefered_lft > valid_lft)
2099 return -EINVAL;
2100
2101 dev = __dev_get_by_index(net, ifindex);
2102 if (!dev)
2103 return -ENODEV;
2104
2105 if ((idev = addrconf_add_dev(dev)) == NULL)
2106 return -ENOBUFS;
2107
2108 scope = ipv6_addr_scope(pfx);
2109
2110 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2111 if (addrconf_finite_timeout(timeout)) {
2112 expires = jiffies_to_clock_t(timeout * HZ);
2113 valid_lft = timeout;
2114 flags = RTF_EXPIRES;
2115 } else {
2116 expires = 0;
2117 flags = 0;
2118 ifa_flags |= IFA_F_PERMANENT;
2119 }
2120
2121 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2122 if (addrconf_finite_timeout(timeout)) {
2123 if (timeout == 0)
2124 ifa_flags |= IFA_F_DEPRECATED;
2125 prefered_lft = timeout;
2126 }
2127
2128 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2129
2130 if (!IS_ERR(ifp)) {
2131 spin_lock_bh(&ifp->lock);
2132 ifp->valid_lft = valid_lft;
2133 ifp->prefered_lft = prefered_lft;
2134 ifp->tstamp = jiffies;
2135 spin_unlock_bh(&ifp->lock);
2136
2137 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2138 expires, flags);
2139 /*
2140 * Note that section 3.1 of RFC 4429 indicates
2141 * that the Optimistic flag should not be set for
2142 * manually configured addresses
2143 */
2144 addrconf_dad_start(ifp, 0);
2145 in6_ifa_put(ifp);
2146 addrconf_verify(0);
2147 return 0;
2148 }
2149
2150 return PTR_ERR(ifp);
2151 }
2152
2153 static int inet6_addr_del(struct net *net, int ifindex, struct in6_addr *pfx,
2154 unsigned int plen)
2155 {
2156 struct inet6_ifaddr *ifp;
2157 struct inet6_dev *idev;
2158 struct net_device *dev;
2159
2160 if (plen > 128)
2161 return -EINVAL;
2162
2163 dev = __dev_get_by_index(net, ifindex);
2164 if (!dev)
2165 return -ENODEV;
2166
2167 if ((idev = __in6_dev_get(dev)) == NULL)
2168 return -ENXIO;
2169
2170 read_lock_bh(&idev->lock);
2171 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2172 if (ifp->prefix_len == plen &&
2173 ipv6_addr_equal(pfx, &ifp->addr)) {
2174 in6_ifa_hold(ifp);
2175 read_unlock_bh(&idev->lock);
2176
2177 ipv6_del_addr(ifp);
2178
2179 /* If the last address is deleted administratively,
2180 disable IPv6 on this interface.
2181 */
2182 if (list_empty(&idev->addr_list))
2183 addrconf_ifdown(idev->dev, 1);
2184 return 0;
2185 }
2186 }
2187 read_unlock_bh(&idev->lock);
2188 return -EADDRNOTAVAIL;
2189 }
2190
2191
2192 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2193 {
2194 struct in6_ifreq ireq;
2195 int err;
2196
2197 if (!capable(CAP_NET_ADMIN))
2198 return -EPERM;
2199
2200 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2201 return -EFAULT;
2202
2203 rtnl_lock();
2204 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2205 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2206 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2207 rtnl_unlock();
2208 return err;
2209 }
2210
2211 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2212 {
2213 struct in6_ifreq ireq;
2214 int err;
2215
2216 if (!capable(CAP_NET_ADMIN))
2217 return -EPERM;
2218
2219 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2220 return -EFAULT;
2221
2222 rtnl_lock();
2223 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2224 ireq.ifr6_prefixlen);
2225 rtnl_unlock();
2226 return err;
2227 }
2228
2229 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2230 int plen, int scope)
2231 {
2232 struct inet6_ifaddr *ifp;
2233
2234 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT);
2235 if (!IS_ERR(ifp)) {
2236 spin_lock_bh(&ifp->lock);
2237 ifp->flags &= ~IFA_F_TENTATIVE;
2238 spin_unlock_bh(&ifp->lock);
2239 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2240 in6_ifa_put(ifp);
2241 }
2242 }
2243
2244 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2245 static void sit_add_v4_addrs(struct inet6_dev *idev)
2246 {
2247 struct in6_addr addr;
2248 struct net_device *dev;
2249 struct net *net = dev_net(idev->dev);
2250 int scope;
2251
2252 ASSERT_RTNL();
2253
2254 memset(&addr, 0, sizeof(struct in6_addr));
2255 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2256
2257 if (idev->dev->flags&IFF_POINTOPOINT) {
2258 addr.s6_addr32[0] = htonl(0xfe800000);
2259 scope = IFA_LINK;
2260 } else {
2261 scope = IPV6_ADDR_COMPATv4;
2262 }
2263
2264 if (addr.s6_addr32[3]) {
2265 add_addr(idev, &addr, 128, scope);
2266 return;
2267 }
2268
2269 for_each_netdev(net, dev) {
2270 struct in_device * in_dev = __in_dev_get_rtnl(dev);
2271 if (in_dev && (dev->flags & IFF_UP)) {
2272 struct in_ifaddr * ifa;
2273
2274 int flag = scope;
2275
2276 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2277 int plen;
2278
2279 addr.s6_addr32[3] = ifa->ifa_local;
2280
2281 if (ifa->ifa_scope == RT_SCOPE_LINK)
2282 continue;
2283 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2284 if (idev->dev->flags&IFF_POINTOPOINT)
2285 continue;
2286 flag |= IFA_HOST;
2287 }
2288 if (idev->dev->flags&IFF_POINTOPOINT)
2289 plen = 64;
2290 else
2291 plen = 96;
2292
2293 add_addr(idev, &addr, plen, flag);
2294 }
2295 }
2296 }
2297 }
2298 #endif
2299
2300 static void init_loopback(struct net_device *dev)
2301 {
2302 struct inet6_dev *idev;
2303
2304 /* ::1 */
2305
2306 ASSERT_RTNL();
2307
2308 if ((idev = ipv6_find_idev(dev)) == NULL) {
2309 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2310 return;
2311 }
2312
2313 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2314 }
2315
2316 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2317 {
2318 struct inet6_ifaddr * ifp;
2319 u32 addr_flags = IFA_F_PERMANENT;
2320
2321 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2322 if (idev->cnf.optimistic_dad &&
2323 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2324 addr_flags |= IFA_F_OPTIMISTIC;
2325 #endif
2326
2327
2328 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2329 if (!IS_ERR(ifp)) {
2330 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2331 addrconf_dad_start(ifp, 0);
2332 in6_ifa_put(ifp);
2333 }
2334 }
2335
2336 static void addrconf_dev_config(struct net_device *dev)
2337 {
2338 struct in6_addr addr;
2339 struct inet6_dev * idev;
2340
2341 ASSERT_RTNL();
2342
2343 if ((dev->type != ARPHRD_ETHER) &&
2344 (dev->type != ARPHRD_FDDI) &&
2345 (dev->type != ARPHRD_IEEE802_TR) &&
2346 (dev->type != ARPHRD_ARCNET) &&
2347 (dev->type != ARPHRD_INFINIBAND)) {
2348 /* Alas, we support only Ethernet autoconfiguration. */
2349 return;
2350 }
2351
2352 idev = addrconf_add_dev(dev);
2353 if (idev == NULL)
2354 return;
2355
2356 memset(&addr, 0, sizeof(struct in6_addr));
2357 addr.s6_addr32[0] = htonl(0xFE800000);
2358
2359 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2360 addrconf_add_linklocal(idev, &addr);
2361 }
2362
2363 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2364 static void addrconf_sit_config(struct net_device *dev)
2365 {
2366 struct inet6_dev *idev;
2367
2368 ASSERT_RTNL();
2369
2370 /*
2371 * Configure the tunnel with one of our IPv4
2372 * addresses... we should configure all of
2373 * our v4 addrs in the tunnel
2374 */
2375
2376 if ((idev = ipv6_find_idev(dev)) == NULL) {
2377 printk(KERN_DEBUG "init sit: add_dev failed\n");
2378 return;
2379 }
2380
2381 if (dev->priv_flags & IFF_ISATAP) {
2382 struct in6_addr addr;
2383
2384 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2385 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2386 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2387 addrconf_add_linklocal(idev, &addr);
2388 return;
2389 }
2390
2391 sit_add_v4_addrs(idev);
2392
2393 if (dev->flags&IFF_POINTOPOINT) {
2394 addrconf_add_mroute(dev);
2395 addrconf_add_lroute(dev);
2396 } else
2397 sit_route_add(dev);
2398 }
2399 #endif
2400
2401 static inline int
2402 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2403 {
2404 struct in6_addr lladdr;
2405
2406 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2407 addrconf_add_linklocal(idev, &lladdr);
2408 return 0;
2409 }
2410 return -1;
2411 }
2412
2413 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2414 {
2415 struct net_device *link_dev;
2416 struct net *net = dev_net(idev->dev);
2417
2418 /* first try to inherit the link-local address from the link device */
2419 if (idev->dev->iflink &&
2420 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
2421 if (!ipv6_inherit_linklocal(idev, link_dev))
2422 return;
2423 }
2424 /* then try to inherit it from any device */
2425 for_each_netdev(net, link_dev) {
2426 if (!ipv6_inherit_linklocal(idev, link_dev))
2427 return;
2428 }
2429 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2430 }
2431
2432 /*
2433 * Autoconfigure tunnel with a link-local address so routing protocols,
2434 * DHCPv6, MLD etc. can be run over the virtual link
2435 */
2436
2437 static void addrconf_ip6_tnl_config(struct net_device *dev)
2438 {
2439 struct inet6_dev *idev;
2440
2441 ASSERT_RTNL();
2442
2443 idev = addrconf_add_dev(dev);
2444 if (!idev) {
2445 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2446 return;
2447 }
2448 ip6_tnl_add_linklocal(idev);
2449 }
2450
2451 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2452 void * data)
2453 {
2454 struct net_device *dev = (struct net_device *) data;
2455 struct inet6_dev *idev = __in6_dev_get(dev);
2456 int run_pending = 0;
2457 int err;
2458
2459 switch (event) {
2460 case NETDEV_REGISTER:
2461 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2462 idev = ipv6_add_dev(dev);
2463 if (!idev)
2464 return notifier_from_errno(-ENOMEM);
2465 }
2466 break;
2467
2468 case NETDEV_UP:
2469 case NETDEV_CHANGE:
2470 if (dev->flags & IFF_SLAVE)
2471 break;
2472
2473 if (event == NETDEV_UP) {
2474 if (!addrconf_qdisc_ok(dev)) {
2475 /* device is not ready yet. */
2476 printk(KERN_INFO
2477 "ADDRCONF(NETDEV_UP): %s: "
2478 "link is not ready\n",
2479 dev->name);
2480 break;
2481 }
2482
2483 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2484 idev = ipv6_add_dev(dev);
2485
2486 if (idev) {
2487 idev->if_flags |= IF_READY;
2488 run_pending = 1;
2489 }
2490 } else {
2491 if (!addrconf_qdisc_ok(dev)) {
2492 /* device is still not ready. */
2493 break;
2494 }
2495
2496 if (idev) {
2497 if (idev->if_flags & IF_READY)
2498 /* device is already configured. */
2499 break;
2500 idev->if_flags |= IF_READY;
2501 }
2502
2503 printk(KERN_INFO
2504 "ADDRCONF(NETDEV_CHANGE): %s: "
2505 "link becomes ready\n",
2506 dev->name);
2507
2508 run_pending = 1;
2509 }
2510
2511 switch (dev->type) {
2512 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2513 case ARPHRD_SIT:
2514 addrconf_sit_config(dev);
2515 break;
2516 #endif
2517 case ARPHRD_TUNNEL6:
2518 addrconf_ip6_tnl_config(dev);
2519 break;
2520 case ARPHRD_LOOPBACK:
2521 init_loopback(dev);
2522 break;
2523
2524 default:
2525 addrconf_dev_config(dev);
2526 break;
2527 }
2528
2529 if (idev) {
2530 if (run_pending)
2531 addrconf_dad_run(idev);
2532
2533 /*
2534 * If the MTU changed during the interface down,
2535 * when the interface up, the changed MTU must be
2536 * reflected in the idev as well as routers.
2537 */
2538 if (idev->cnf.mtu6 != dev->mtu &&
2539 dev->mtu >= IPV6_MIN_MTU) {
2540 rt6_mtu_change(dev, dev->mtu);
2541 idev->cnf.mtu6 = dev->mtu;
2542 }
2543 idev->tstamp = jiffies;
2544 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2545
2546 /*
2547 * If the changed mtu during down is lower than
2548 * IPV6_MIN_MTU stop IPv6 on this interface.
2549 */
2550 if (dev->mtu < IPV6_MIN_MTU)
2551 addrconf_ifdown(dev, 1);
2552 }
2553 break;
2554
2555 case NETDEV_CHANGEMTU:
2556 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2557 rt6_mtu_change(dev, dev->mtu);
2558 idev->cnf.mtu6 = dev->mtu;
2559 break;
2560 }
2561
2562 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2563 idev = ipv6_add_dev(dev);
2564 if (idev)
2565 break;
2566 }
2567
2568 /*
2569 * MTU falled under IPV6_MIN_MTU.
2570 * Stop IPv6 on this interface.
2571 */
2572
2573 case NETDEV_DOWN:
2574 case NETDEV_UNREGISTER:
2575 /*
2576 * Remove all addresses from this interface.
2577 */
2578 addrconf_ifdown(dev, event != NETDEV_DOWN);
2579 break;
2580
2581 case NETDEV_CHANGENAME:
2582 if (idev) {
2583 snmp6_unregister_dev(idev);
2584 addrconf_sysctl_unregister(idev);
2585 addrconf_sysctl_register(idev);
2586 err = snmp6_register_dev(idev);
2587 if (err)
2588 return notifier_from_errno(err);
2589 }
2590 break;
2591
2592 case NETDEV_PRE_TYPE_CHANGE:
2593 case NETDEV_POST_TYPE_CHANGE:
2594 addrconf_type_change(dev, event);
2595 break;
2596 }
2597
2598 return NOTIFY_OK;
2599 }
2600
2601 /*
2602 * addrconf module should be notified of a device going up
2603 */
2604 static struct notifier_block ipv6_dev_notf = {
2605 .notifier_call = addrconf_notify,
2606 };
2607
2608 static void addrconf_type_change(struct net_device *dev, unsigned long event)
2609 {
2610 struct inet6_dev *idev;
2611 ASSERT_RTNL();
2612
2613 idev = __in6_dev_get(dev);
2614
2615 if (event == NETDEV_POST_TYPE_CHANGE)
2616 ipv6_mc_remap(idev);
2617 else if (event == NETDEV_PRE_TYPE_CHANGE)
2618 ipv6_mc_unmap(idev);
2619 }
2620
2621 static int addrconf_ifdown(struct net_device *dev, int how)
2622 {
2623 struct net *net = dev_net(dev);
2624 struct inet6_dev *idev;
2625 struct inet6_ifaddr *ifa;
2626 LIST_HEAD(keep_list);
2627
2628 ASSERT_RTNL();
2629
2630 rt6_ifdown(net, dev);
2631 neigh_ifdown(&nd_tbl, dev);
2632
2633 idev = __in6_dev_get(dev);
2634 if (idev == NULL)
2635 return -ENODEV;
2636
2637 /*
2638 * Step 1: remove reference to ipv6 device from parent device.
2639 * Do not dev_put!
2640 */
2641 if (how) {
2642 idev->dead = 1;
2643
2644 /* protected by rtnl_lock */
2645 rcu_assign_pointer(dev->ip6_ptr, NULL);
2646
2647 /* Step 1.5: remove snmp6 entry */
2648 snmp6_unregister_dev(idev);
2649
2650 }
2651
2652 write_lock_bh(&idev->lock);
2653
2654 /* Step 2: clear flags for stateless addrconf */
2655 if (!how)
2656 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2657
2658 #ifdef CONFIG_IPV6_PRIVACY
2659 if (how && del_timer(&idev->regen_timer))
2660 in6_dev_put(idev);
2661
2662 /* Step 3: clear tempaddr list */
2663 while (!list_empty(&idev->tempaddr_list)) {
2664 ifa = list_first_entry(&idev->tempaddr_list,
2665 struct inet6_ifaddr, tmp_list);
2666 list_del(&ifa->tmp_list);
2667 ifa->dead = 1;
2668 write_unlock_bh(&idev->lock);
2669 spin_lock_bh(&ifa->lock);
2670
2671 if (ifa->ifpub) {
2672 in6_ifa_put(ifa->ifpub);
2673 ifa->ifpub = NULL;
2674 }
2675 spin_unlock_bh(&ifa->lock);
2676 in6_ifa_put(ifa);
2677 write_lock_bh(&idev->lock);
2678 }
2679 #endif
2680
2681 while (!list_empty(&idev->addr_list)) {
2682 ifa = list_first_entry(&idev->addr_list,
2683 struct inet6_ifaddr, if_list);
2684 addrconf_del_timer(ifa);
2685
2686 /* If just doing link down, and address is permanent
2687 and not link-local, then retain it. */
2688 if (!how &&
2689 (ifa->flags&IFA_F_PERMANENT) &&
2690 !(ipv6_addr_type(&ifa->addr) & IPV6_ADDR_LINKLOCAL)) {
2691 list_move_tail(&ifa->if_list, &keep_list);
2692
2693 /* If not doing DAD on this address, just keep it. */
2694 if ((dev->flags&(IFF_NOARP|IFF_LOOPBACK)) ||
2695 idev->cnf.accept_dad <= 0 ||
2696 (ifa->flags & IFA_F_NODAD))
2697 continue;
2698
2699 /* If it was tentative already, no need to notify */
2700 if (ifa->flags & IFA_F_TENTATIVE)
2701 continue;
2702
2703 /* Flag it for later restoration when link comes up */
2704 ifa->flags |= IFA_F_TENTATIVE;
2705 in6_ifa_hold(ifa);
2706 write_unlock_bh(&idev->lock);
2707 } else {
2708 list_del(&ifa->if_list);
2709 ifa->dead = 1;
2710 write_unlock_bh(&idev->lock);
2711
2712 /* clear hash table */
2713 spin_lock_bh(&addrconf_hash_lock);
2714 hlist_del_init_rcu(&ifa->addr_lst);
2715 spin_unlock_bh(&addrconf_hash_lock);
2716 }
2717
2718 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2719 if (ifa->dead)
2720 atomic_notifier_call_chain(&inet6addr_chain,
2721 NETDEV_DOWN, ifa);
2722 in6_ifa_put(ifa);
2723
2724 write_lock_bh(&idev->lock);
2725 }
2726
2727 list_splice(&keep_list, &idev->addr_list);
2728
2729 write_unlock_bh(&idev->lock);
2730
2731 /* Step 5: Discard multicast list */
2732 if (how)
2733 ipv6_mc_destroy_dev(idev);
2734 else
2735 ipv6_mc_down(idev);
2736
2737 idev->tstamp = jiffies;
2738
2739 /* Last: Shot the device (if unregistered) */
2740 if (how) {
2741 addrconf_sysctl_unregister(idev);
2742 neigh_parms_release(&nd_tbl, idev->nd_parms);
2743 neigh_ifdown(&nd_tbl, dev);
2744 in6_dev_put(idev);
2745 }
2746 return 0;
2747 }
2748
2749 static void addrconf_rs_timer(unsigned long data)
2750 {
2751 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2752 struct inet6_dev *idev = ifp->idev;
2753
2754 read_lock(&idev->lock);
2755 if (idev->dead || !(idev->if_flags & IF_READY))
2756 goto out;
2757
2758 if (idev->cnf.forwarding)
2759 goto out;
2760
2761 /* Announcement received after solicitation was sent */
2762 if (idev->if_flags & IF_RA_RCVD)
2763 goto out;
2764
2765 spin_lock(&ifp->lock);
2766 if (ifp->probes++ < idev->cnf.rtr_solicits) {
2767 /* The wait after the last probe can be shorter */
2768 addrconf_mod_timer(ifp, AC_RS,
2769 (ifp->probes == idev->cnf.rtr_solicits) ?
2770 idev->cnf.rtr_solicit_delay :
2771 idev->cnf.rtr_solicit_interval);
2772 spin_unlock(&ifp->lock);
2773
2774 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2775 } else {
2776 spin_unlock(&ifp->lock);
2777 /*
2778 * Note: we do not support deprecated "all on-link"
2779 * assumption any longer.
2780 */
2781 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2782 idev->dev->name);
2783 }
2784
2785 out:
2786 read_unlock(&idev->lock);
2787 in6_ifa_put(ifp);
2788 }
2789
2790 /*
2791 * Duplicate Address Detection
2792 */
2793 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2794 {
2795 unsigned long rand_num;
2796 struct inet6_dev *idev = ifp->idev;
2797
2798 if (ifp->flags & IFA_F_OPTIMISTIC)
2799 rand_num = 0;
2800 else
2801 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2802
2803 ifp->probes = idev->cnf.dad_transmits;
2804 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2805 }
2806
2807 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2808 {
2809 struct inet6_dev *idev = ifp->idev;
2810 struct net_device *dev = idev->dev;
2811
2812 addrconf_join_solict(dev, &ifp->addr);
2813
2814 net_srandom(ifp->addr.s6_addr32[3]);
2815
2816 read_lock_bh(&idev->lock);
2817 if (ifp->dead)
2818 goto out;
2819
2820 spin_lock(&ifp->lock);
2821 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2822 idev->cnf.accept_dad < 1 ||
2823 !(ifp->flags&IFA_F_TENTATIVE) ||
2824 ifp->flags & IFA_F_NODAD) {
2825 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
2826 spin_unlock(&ifp->lock);
2827 read_unlock_bh(&idev->lock);
2828
2829 addrconf_dad_completed(ifp);
2830 return;
2831 }
2832
2833 if (!(idev->if_flags & IF_READY)) {
2834 spin_unlock(&ifp->lock);
2835 read_unlock_bh(&idev->lock);
2836 /*
2837 * If the device is not ready:
2838 * - keep it tentative if it is a permanent address.
2839 * - otherwise, kill it.
2840 */
2841 in6_ifa_hold(ifp);
2842 addrconf_dad_stop(ifp, 0);
2843 return;
2844 }
2845
2846 /*
2847 * Optimistic nodes can start receiving
2848 * Frames right away
2849 */
2850 if (ifp->flags & IFA_F_OPTIMISTIC)
2851 ip6_ins_rt(ifp->rt);
2852
2853 addrconf_dad_kick(ifp);
2854 spin_unlock(&ifp->lock);
2855 out:
2856 read_unlock_bh(&idev->lock);
2857 }
2858
2859 static void addrconf_dad_timer(unsigned long data)
2860 {
2861 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2862 struct inet6_dev *idev = ifp->idev;
2863 struct in6_addr mcaddr;
2864
2865 read_lock(&idev->lock);
2866 if (idev->dead || !(idev->if_flags & IF_READY)) {
2867 read_unlock(&idev->lock);
2868 goto out;
2869 }
2870
2871 spin_lock(&ifp->lock);
2872 if (ifp->probes == 0) {
2873 /*
2874 * DAD was successful
2875 */
2876
2877 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
2878 spin_unlock(&ifp->lock);
2879 read_unlock(&idev->lock);
2880
2881 addrconf_dad_completed(ifp);
2882
2883 goto out;
2884 }
2885
2886 ifp->probes--;
2887 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2888 spin_unlock(&ifp->lock);
2889 read_unlock(&idev->lock);
2890
2891 /* send a neighbour solicitation for our addr */
2892 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2893 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
2894 out:
2895 in6_ifa_put(ifp);
2896 }
2897
2898 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2899 {
2900 struct net_device *dev = ifp->idev->dev;
2901
2902 /*
2903 * Configure the address for reception. Now it is valid.
2904 */
2905
2906 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2907
2908 /* If added prefix is link local and forwarding is off,
2909 start sending router solicitations.
2910 */
2911
2912 if (ifp->idev->cnf.forwarding == 0 &&
2913 ifp->idev->cnf.rtr_solicits > 0 &&
2914 (dev->flags&IFF_LOOPBACK) == 0 &&
2915 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2916 /*
2917 * If a host as already performed a random delay
2918 * [...] as part of DAD [...] there is no need
2919 * to delay again before sending the first RS
2920 */
2921 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2922
2923 spin_lock_bh(&ifp->lock);
2924 ifp->probes = 1;
2925 ifp->idev->if_flags |= IF_RS_SENT;
2926 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2927 spin_unlock_bh(&ifp->lock);
2928 }
2929 }
2930
2931 static void addrconf_dad_run(struct inet6_dev *idev)
2932 {
2933 struct inet6_ifaddr *ifp;
2934
2935 read_lock_bh(&idev->lock);
2936 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2937 spin_lock(&ifp->lock);
2938 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2939 spin_unlock(&ifp->lock);
2940 continue;
2941 }
2942 spin_unlock(&ifp->lock);
2943 addrconf_dad_kick(ifp);
2944 }
2945 read_unlock_bh(&idev->lock);
2946 }
2947
2948 #ifdef CONFIG_PROC_FS
2949 struct if6_iter_state {
2950 struct seq_net_private p;
2951 int bucket;
2952 };
2953
2954 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2955 {
2956 struct inet6_ifaddr *ifa = NULL;
2957 struct if6_iter_state *state = seq->private;
2958 struct net *net = seq_file_net(seq);
2959
2960 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2961 struct hlist_node *n;
2962 hlist_for_each_entry_rcu(ifa, n, &inet6_addr_lst[state->bucket],
2963 addr_lst)
2964 if (net_eq(dev_net(ifa->idev->dev), net))
2965 return ifa;
2966 }
2967 return NULL;
2968 }
2969
2970 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
2971 struct inet6_ifaddr *ifa)
2972 {
2973 struct if6_iter_state *state = seq->private;
2974 struct net *net = seq_file_net(seq);
2975 struct hlist_node *n = &ifa->addr_lst;
2976
2977 hlist_for_each_entry_continue_rcu(ifa, n, addr_lst)
2978 if (net_eq(dev_net(ifa->idev->dev), net))
2979 return ifa;
2980
2981 while (++state->bucket < IN6_ADDR_HSIZE) {
2982 hlist_for_each_entry(ifa, n,
2983 &inet6_addr_lst[state->bucket], addr_lst) {
2984 if (net_eq(dev_net(ifa->idev->dev), net))
2985 return ifa;
2986 }
2987 }
2988
2989 return NULL;
2990 }
2991
2992 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2993 {
2994 struct inet6_ifaddr *ifa = if6_get_first(seq);
2995
2996 if (ifa)
2997 while (pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2998 --pos;
2999 return pos ? NULL : ifa;
3000 }
3001
3002 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3003 __acquires(rcu)
3004 {
3005 rcu_read_lock_bh();
3006 return if6_get_idx(seq, *pos);
3007 }
3008
3009 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3010 {
3011 struct inet6_ifaddr *ifa;
3012
3013 ifa = if6_get_next(seq, v);
3014 ++*pos;
3015 return ifa;
3016 }
3017
3018 static void if6_seq_stop(struct seq_file *seq, void *v)
3019 __releases(rcu)
3020 {
3021 rcu_read_unlock_bh();
3022 }
3023
3024 static int if6_seq_show(struct seq_file *seq, void *v)
3025 {
3026 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3027 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3028 &ifp->addr,
3029 ifp->idev->dev->ifindex,
3030 ifp->prefix_len,
3031 ifp->scope,
3032 ifp->flags,
3033 ifp->idev->dev->name);
3034 return 0;
3035 }
3036
3037 static const struct seq_operations if6_seq_ops = {
3038 .start = if6_seq_start,
3039 .next = if6_seq_next,
3040 .show = if6_seq_show,
3041 .stop = if6_seq_stop,
3042 };
3043
3044 static int if6_seq_open(struct inode *inode, struct file *file)
3045 {
3046 return seq_open_net(inode, file, &if6_seq_ops,
3047 sizeof(struct if6_iter_state));
3048 }
3049
3050 static const struct file_operations if6_fops = {
3051 .owner = THIS_MODULE,
3052 .open = if6_seq_open,
3053 .read = seq_read,
3054 .llseek = seq_lseek,
3055 .release = seq_release_net,
3056 };
3057
3058 static int __net_init if6_proc_net_init(struct net *net)
3059 {
3060 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
3061 return -ENOMEM;
3062 return 0;
3063 }
3064
3065 static void __net_exit if6_proc_net_exit(struct net *net)
3066 {
3067 proc_net_remove(net, "if_inet6");
3068 }
3069
3070 static struct pernet_operations if6_proc_net_ops = {
3071 .init = if6_proc_net_init,
3072 .exit = if6_proc_net_exit,
3073 };
3074
3075 int __init if6_proc_init(void)
3076 {
3077 return register_pernet_subsys(&if6_proc_net_ops);
3078 }
3079
3080 void if6_proc_exit(void)
3081 {
3082 unregister_pernet_subsys(&if6_proc_net_ops);
3083 }
3084 #endif /* CONFIG_PROC_FS */
3085
3086 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3087 /* Check if address is a home address configured on any interface. */
3088 int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr)
3089 {
3090 int ret = 0;
3091 struct inet6_ifaddr *ifp = NULL;
3092 struct hlist_node *n;
3093 unsigned int hash = ipv6_addr_hash(addr);
3094
3095 rcu_read_lock_bh();
3096 hlist_for_each_entry_rcu(ifp, n, &inet6_addr_lst[hash], addr_lst) {
3097 if (!net_eq(dev_net(ifp->idev->dev), net))
3098 continue;
3099 if (ipv6_addr_equal(&ifp->addr, addr) &&
3100 (ifp->flags & IFA_F_HOMEADDRESS)) {
3101 ret = 1;
3102 break;
3103 }
3104 }
3105 rcu_read_unlock_bh();
3106 return ret;
3107 }
3108 #endif
3109
3110 /*
3111 * Periodic address status verification
3112 */
3113
3114 static void addrconf_verify(unsigned long foo)
3115 {
3116 unsigned long now, next, next_sec, next_sched;
3117 struct inet6_ifaddr *ifp;
3118 struct hlist_node *node;
3119 int i;
3120
3121 rcu_read_lock_bh();
3122 spin_lock(&addrconf_verify_lock);
3123 now = jiffies;
3124 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3125
3126 del_timer(&addr_chk_timer);
3127
3128 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3129 restart:
3130 hlist_for_each_entry_rcu(ifp, node,
3131 &inet6_addr_lst[i], addr_lst) {
3132 unsigned long age;
3133
3134 if (ifp->flags & IFA_F_PERMANENT)
3135 continue;
3136
3137 spin_lock(&ifp->lock);
3138 /* We try to batch several events at once. */
3139 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3140
3141 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3142 age >= ifp->valid_lft) {
3143 spin_unlock(&ifp->lock);
3144 in6_ifa_hold(ifp);
3145 ipv6_del_addr(ifp);
3146 goto restart;
3147 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3148 spin_unlock(&ifp->lock);
3149 continue;
3150 } else if (age >= ifp->prefered_lft) {
3151 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3152 int deprecate = 0;
3153
3154 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3155 deprecate = 1;
3156 ifp->flags |= IFA_F_DEPRECATED;
3157 }
3158
3159 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3160 next = ifp->tstamp + ifp->valid_lft * HZ;
3161
3162 spin_unlock(&ifp->lock);
3163
3164 if (deprecate) {
3165 in6_ifa_hold(ifp);
3166
3167 ipv6_ifa_notify(0, ifp);
3168 in6_ifa_put(ifp);
3169 goto restart;
3170 }
3171 #ifdef CONFIG_IPV6_PRIVACY
3172 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3173 !(ifp->flags&IFA_F_TENTATIVE)) {
3174 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3175 ifp->idev->cnf.dad_transmits *
3176 ifp->idev->nd_parms->retrans_time / HZ;
3177
3178 if (age >= ifp->prefered_lft - regen_advance) {
3179 struct inet6_ifaddr *ifpub = ifp->ifpub;
3180 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3181 next = ifp->tstamp + ifp->prefered_lft * HZ;
3182 if (!ifp->regen_count && ifpub) {
3183 ifp->regen_count++;
3184 in6_ifa_hold(ifp);
3185 in6_ifa_hold(ifpub);
3186 spin_unlock(&ifp->lock);
3187
3188 spin_lock(&ifpub->lock);
3189 ifpub->regen_count = 0;
3190 spin_unlock(&ifpub->lock);
3191 ipv6_create_tempaddr(ifpub, ifp);
3192 in6_ifa_put(ifpub);
3193 in6_ifa_put(ifp);
3194 goto restart;
3195 }
3196 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3197 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3198 spin_unlock(&ifp->lock);
3199 #endif
3200 } else {
3201 /* ifp->prefered_lft <= ifp->valid_lft */
3202 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3203 next = ifp->tstamp + ifp->prefered_lft * HZ;
3204 spin_unlock(&ifp->lock);
3205 }
3206 }
3207 }
3208
3209 next_sec = round_jiffies_up(next);
3210 next_sched = next;
3211
3212 /* If rounded timeout is accurate enough, accept it. */
3213 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3214 next_sched = next_sec;
3215
3216 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3217 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3218 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3219
3220 ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3221 now, next, next_sec, next_sched));
3222
3223 addr_chk_timer.expires = next_sched;
3224 add_timer(&addr_chk_timer);
3225 spin_unlock(&addrconf_verify_lock);
3226 rcu_read_unlock_bh();
3227 }
3228
3229 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3230 {
3231 struct in6_addr *pfx = NULL;
3232
3233 if (addr)
3234 pfx = nla_data(addr);
3235
3236 if (local) {
3237 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3238 pfx = NULL;
3239 else
3240 pfx = nla_data(local);
3241 }
3242
3243 return pfx;
3244 }
3245
3246 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3247 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3248 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3249 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3250 };
3251
3252 static int
3253 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3254 {
3255 struct net *net = sock_net(skb->sk);
3256 struct ifaddrmsg *ifm;
3257 struct nlattr *tb[IFA_MAX+1];
3258 struct in6_addr *pfx;
3259 int err;
3260
3261 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3262 if (err < 0)
3263 return err;
3264
3265 ifm = nlmsg_data(nlh);
3266 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3267 if (pfx == NULL)
3268 return -EINVAL;
3269
3270 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3271 }
3272
3273 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3274 u32 prefered_lft, u32 valid_lft)
3275 {
3276 u32 flags;
3277 clock_t expires;
3278 unsigned long timeout;
3279
3280 if (!valid_lft || (prefered_lft > valid_lft))
3281 return -EINVAL;
3282
3283 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3284 if (addrconf_finite_timeout(timeout)) {
3285 expires = jiffies_to_clock_t(timeout * HZ);
3286 valid_lft = timeout;
3287 flags = RTF_EXPIRES;
3288 } else {
3289 expires = 0;
3290 flags = 0;
3291 ifa_flags |= IFA_F_PERMANENT;
3292 }
3293
3294 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3295 if (addrconf_finite_timeout(timeout)) {
3296 if (timeout == 0)
3297 ifa_flags |= IFA_F_DEPRECATED;
3298 prefered_lft = timeout;
3299 }
3300
3301 spin_lock_bh(&ifp->lock);
3302 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3303 ifp->tstamp = jiffies;
3304 ifp->valid_lft = valid_lft;
3305 ifp->prefered_lft = prefered_lft;
3306
3307 spin_unlock_bh(&ifp->lock);
3308 if (!(ifp->flags&IFA_F_TENTATIVE))
3309 ipv6_ifa_notify(0, ifp);
3310
3311 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3312 expires, flags);
3313 addrconf_verify(0);
3314
3315 return 0;
3316 }
3317
3318 static int
3319 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3320 {
3321 struct net *net = sock_net(skb->sk);
3322 struct ifaddrmsg *ifm;
3323 struct nlattr *tb[IFA_MAX+1];
3324 struct in6_addr *pfx;
3325 struct inet6_ifaddr *ifa;
3326 struct net_device *dev;
3327 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3328 u8 ifa_flags;
3329 int err;
3330
3331 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3332 if (err < 0)
3333 return err;
3334
3335 ifm = nlmsg_data(nlh);
3336 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3337 if (pfx == NULL)
3338 return -EINVAL;
3339
3340 if (tb[IFA_CACHEINFO]) {
3341 struct ifa_cacheinfo *ci;
3342
3343 ci = nla_data(tb[IFA_CACHEINFO]);
3344 valid_lft = ci->ifa_valid;
3345 preferred_lft = ci->ifa_prefered;
3346 } else {
3347 preferred_lft = INFINITY_LIFE_TIME;
3348 valid_lft = INFINITY_LIFE_TIME;
3349 }
3350
3351 dev = __dev_get_by_index(net, ifm->ifa_index);
3352 if (dev == NULL)
3353 return -ENODEV;
3354
3355 /* We ignore other flags so far. */
3356 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3357
3358 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3359 if (ifa == NULL) {
3360 /*
3361 * It would be best to check for !NLM_F_CREATE here but
3362 * userspace alreay relies on not having to provide this.
3363 */
3364 return inet6_addr_add(net, ifm->ifa_index, pfx,
3365 ifm->ifa_prefixlen, ifa_flags,
3366 preferred_lft, valid_lft);
3367 }
3368
3369 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3370 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3371 err = -EEXIST;
3372 else
3373 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3374
3375 in6_ifa_put(ifa);
3376
3377 return err;
3378 }
3379
3380 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3381 u8 scope, int ifindex)
3382 {
3383 struct ifaddrmsg *ifm;
3384
3385 ifm = nlmsg_data(nlh);
3386 ifm->ifa_family = AF_INET6;
3387 ifm->ifa_prefixlen = prefixlen;
3388 ifm->ifa_flags = flags;
3389 ifm->ifa_scope = scope;
3390 ifm->ifa_index = ifindex;
3391 }
3392
3393 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3394 unsigned long tstamp, u32 preferred, u32 valid)
3395 {
3396 struct ifa_cacheinfo ci;
3397
3398 ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3399 + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3400 ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3401 + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3402 ci.ifa_prefered = preferred;
3403 ci.ifa_valid = valid;
3404
3405 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3406 }
3407
3408 static inline int rt_scope(int ifa_scope)
3409 {
3410 if (ifa_scope & IFA_HOST)
3411 return RT_SCOPE_HOST;
3412 else if (ifa_scope & IFA_LINK)
3413 return RT_SCOPE_LINK;
3414 else if (ifa_scope & IFA_SITE)
3415 return RT_SCOPE_SITE;
3416 else
3417 return RT_SCOPE_UNIVERSE;
3418 }
3419
3420 static inline int inet6_ifaddr_msgsize(void)
3421 {
3422 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3423 + nla_total_size(16) /* IFA_ADDRESS */
3424 + nla_total_size(sizeof(struct ifa_cacheinfo));
3425 }
3426
3427 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3428 u32 pid, u32 seq, int event, unsigned int flags)
3429 {
3430 struct nlmsghdr *nlh;
3431 u32 preferred, valid;
3432
3433 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3434 if (nlh == NULL)
3435 return -EMSGSIZE;
3436
3437 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3438 ifa->idev->dev->ifindex);
3439
3440 if (!(ifa->flags&IFA_F_PERMANENT)) {
3441 preferred = ifa->prefered_lft;
3442 valid = ifa->valid_lft;
3443 if (preferred != INFINITY_LIFE_TIME) {
3444 long tval = (jiffies - ifa->tstamp)/HZ;
3445 if (preferred > tval)
3446 preferred -= tval;
3447 else
3448 preferred = 0;
3449 if (valid != INFINITY_LIFE_TIME)
3450 valid -= tval;
3451 }
3452 } else {
3453 preferred = INFINITY_LIFE_TIME;
3454 valid = INFINITY_LIFE_TIME;
3455 }
3456
3457 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3458 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3459 nlmsg_cancel(skb, nlh);
3460 return -EMSGSIZE;
3461 }
3462
3463 return nlmsg_end(skb, nlh);
3464 }
3465
3466 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3467 u32 pid, u32 seq, int event, u16 flags)
3468 {
3469 struct nlmsghdr *nlh;
3470 u8 scope = RT_SCOPE_UNIVERSE;
3471 int ifindex = ifmca->idev->dev->ifindex;
3472
3473 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3474 scope = RT_SCOPE_SITE;
3475
3476 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3477 if (nlh == NULL)
3478 return -EMSGSIZE;
3479
3480 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3481 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3482 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3483 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3484 nlmsg_cancel(skb, nlh);
3485 return -EMSGSIZE;
3486 }
3487
3488 return nlmsg_end(skb, nlh);
3489 }
3490
3491 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3492 u32 pid, u32 seq, int event, unsigned int flags)
3493 {
3494 struct nlmsghdr *nlh;
3495 u8 scope = RT_SCOPE_UNIVERSE;
3496 int ifindex = ifaca->aca_idev->dev->ifindex;
3497
3498 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3499 scope = RT_SCOPE_SITE;
3500
3501 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3502 if (nlh == NULL)
3503 return -EMSGSIZE;
3504
3505 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3506 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3507 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3508 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3509 nlmsg_cancel(skb, nlh);
3510 return -EMSGSIZE;
3511 }
3512
3513 return nlmsg_end(skb, nlh);
3514 }
3515
3516 enum addr_type_t {
3517 UNICAST_ADDR,
3518 MULTICAST_ADDR,
3519 ANYCAST_ADDR,
3520 };
3521
3522 /* called with rcu_read_lock() */
3523 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3524 struct netlink_callback *cb, enum addr_type_t type,
3525 int s_ip_idx, int *p_ip_idx)
3526 {
3527 struct ifmcaddr6 *ifmca;
3528 struct ifacaddr6 *ifaca;
3529 int err = 1;
3530 int ip_idx = *p_ip_idx;
3531
3532 read_lock_bh(&idev->lock);
3533 switch (type) {
3534 case UNICAST_ADDR: {
3535 struct inet6_ifaddr *ifa;
3536
3537 /* unicast address incl. temp addr */
3538 list_for_each_entry(ifa, &idev->addr_list, if_list) {
3539 if (++ip_idx < s_ip_idx)
3540 continue;
3541 err = inet6_fill_ifaddr(skb, ifa,
3542 NETLINK_CB(cb->skb).pid,
3543 cb->nlh->nlmsg_seq,
3544 RTM_NEWADDR,
3545 NLM_F_MULTI);
3546 if (err <= 0)
3547 break;
3548 }
3549 break;
3550 }
3551 case MULTICAST_ADDR:
3552 /* multicast address */
3553 for (ifmca = idev->mc_list; ifmca;
3554 ifmca = ifmca->next, ip_idx++) {
3555 if (ip_idx < s_ip_idx)
3556 continue;
3557 err = inet6_fill_ifmcaddr(skb, ifmca,
3558 NETLINK_CB(cb->skb).pid,
3559 cb->nlh->nlmsg_seq,
3560 RTM_GETMULTICAST,
3561 NLM_F_MULTI);
3562 if (err <= 0)
3563 break;
3564 }
3565 break;
3566 case ANYCAST_ADDR:
3567 /* anycast address */
3568 for (ifaca = idev->ac_list; ifaca;
3569 ifaca = ifaca->aca_next, ip_idx++) {
3570 if (ip_idx < s_ip_idx)
3571 continue;
3572 err = inet6_fill_ifacaddr(skb, ifaca,
3573 NETLINK_CB(cb->skb).pid,
3574 cb->nlh->nlmsg_seq,
3575 RTM_GETANYCAST,
3576 NLM_F_MULTI);
3577 if (err <= 0)
3578 break;
3579 }
3580 break;
3581 default:
3582 break;
3583 }
3584 read_unlock_bh(&idev->lock);
3585 *p_ip_idx = ip_idx;
3586 return err;
3587 }
3588
3589 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3590 enum addr_type_t type)
3591 {
3592 struct net *net = sock_net(skb->sk);
3593 int h, s_h;
3594 int idx, ip_idx;
3595 int s_idx, s_ip_idx;
3596 struct net_device *dev;
3597 struct inet6_dev *idev;
3598 struct hlist_head *head;
3599 struct hlist_node *node;
3600
3601 s_h = cb->args[0];
3602 s_idx = idx = cb->args[1];
3603 s_ip_idx = ip_idx = cb->args[2];
3604
3605 rcu_read_lock();
3606 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3607 idx = 0;
3608 head = &net->dev_index_head[h];
3609 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3610 if (idx < s_idx)
3611 goto cont;
3612 if (h > s_h || idx > s_idx)
3613 s_ip_idx = 0;
3614 ip_idx = 0;
3615 idev = __in6_dev_get(dev);
3616 if (!idev)
3617 goto cont;
3618
3619 if (in6_dump_addrs(idev, skb, cb, type,
3620 s_ip_idx, &ip_idx) <= 0)
3621 goto done;
3622 cont:
3623 idx++;
3624 }
3625 }
3626 done:
3627 rcu_read_unlock();
3628 cb->args[0] = h;
3629 cb->args[1] = idx;
3630 cb->args[2] = ip_idx;
3631
3632 return skb->len;
3633 }
3634
3635 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3636 {
3637 enum addr_type_t type = UNICAST_ADDR;
3638
3639 return inet6_dump_addr(skb, cb, type);
3640 }
3641
3642 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3643 {
3644 enum addr_type_t type = MULTICAST_ADDR;
3645
3646 return inet6_dump_addr(skb, cb, type);
3647 }
3648
3649
3650 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3651 {
3652 enum addr_type_t type = ANYCAST_ADDR;
3653
3654 return inet6_dump_addr(skb, cb, type);
3655 }
3656
3657 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3658 void *arg)
3659 {
3660 struct net *net = sock_net(in_skb->sk);
3661 struct ifaddrmsg *ifm;
3662 struct nlattr *tb[IFA_MAX+1];
3663 struct in6_addr *addr = NULL;
3664 struct net_device *dev = NULL;
3665 struct inet6_ifaddr *ifa;
3666 struct sk_buff *skb;
3667 int err;
3668
3669 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3670 if (err < 0)
3671 goto errout;
3672
3673 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3674 if (addr == NULL) {
3675 err = -EINVAL;
3676 goto errout;
3677 }
3678
3679 ifm = nlmsg_data(nlh);
3680 if (ifm->ifa_index)
3681 dev = __dev_get_by_index(net, ifm->ifa_index);
3682
3683 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
3684 if (!ifa) {
3685 err = -EADDRNOTAVAIL;
3686 goto errout;
3687 }
3688
3689 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
3690 if (!skb) {
3691 err = -ENOBUFS;
3692 goto errout_ifa;
3693 }
3694
3695 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3696 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3697 if (err < 0) {
3698 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3699 WARN_ON(err == -EMSGSIZE);
3700 kfree_skb(skb);
3701 goto errout_ifa;
3702 }
3703 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
3704 errout_ifa:
3705 in6_ifa_put(ifa);
3706 errout:
3707 return err;
3708 }
3709
3710 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3711 {
3712 struct sk_buff *skb;
3713 struct net *net = dev_net(ifa->idev->dev);
3714 int err = -ENOBUFS;
3715
3716 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3717 if (skb == NULL)
3718 goto errout;
3719
3720 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3721 if (err < 0) {
3722 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3723 WARN_ON(err == -EMSGSIZE);
3724 kfree_skb(skb);
3725 goto errout;
3726 }
3727 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3728 return;
3729 errout:
3730 if (err < 0)
3731 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3732 }
3733
3734 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3735 __s32 *array, int bytes)
3736 {
3737 BUG_ON(bytes < (DEVCONF_MAX * 4));
3738
3739 memset(array, 0, bytes);
3740 array[DEVCONF_FORWARDING] = cnf->forwarding;
3741 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3742 array[DEVCONF_MTU6] = cnf->mtu6;
3743 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3744 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3745 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3746 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3747 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3748 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3749 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3750 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3751 #ifdef CONFIG_IPV6_PRIVACY
3752 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3753 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3754 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3755 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3756 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3757 #endif
3758 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3759 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3760 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3761 #ifdef CONFIG_IPV6_ROUTER_PREF
3762 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3763 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
3764 #ifdef CONFIG_IPV6_ROUTE_INFO
3765 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3766 #endif
3767 #endif
3768 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3769 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3770 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3771 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3772 #endif
3773 #ifdef CONFIG_IPV6_MROUTE
3774 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
3775 #endif
3776 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
3777 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
3778 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
3779 }
3780
3781 static inline size_t inet6_if_nlmsg_size(void)
3782 {
3783 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3784 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3785 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3786 + nla_total_size(4) /* IFLA_MTU */
3787 + nla_total_size(4) /* IFLA_LINK */
3788 + nla_total_size( /* IFLA_PROTINFO */
3789 nla_total_size(4) /* IFLA_INET6_FLAGS */
3790 + nla_total_size(sizeof(struct ifla_cacheinfo))
3791 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3792 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3793 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
3794 );
3795 }
3796
3797 static inline void __snmp6_fill_stats(u64 *stats, void __percpu **mib,
3798 int items, int bytes)
3799 {
3800 int i;
3801 int pad = bytes - sizeof(u64) * items;
3802 BUG_ON(pad < 0);
3803
3804 /* Use put_unaligned() because stats may not be aligned for u64. */
3805 put_unaligned(items, &stats[0]);
3806 for (i = 1; i < items; i++)
3807 put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3808
3809 memset(&stats[items], 0, pad);
3810 }
3811
3812 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3813 int bytes)
3814 {
3815 switch (attrtype) {
3816 case IFLA_INET6_STATS:
3817 __snmp6_fill_stats(stats, (void __percpu **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes);
3818 break;
3819 case IFLA_INET6_ICMP6STATS:
3820 __snmp6_fill_stats(stats, (void __percpu **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
3821 break;
3822 }
3823 }
3824
3825 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3826 u32 pid, u32 seq, int event, unsigned int flags)
3827 {
3828 struct net_device *dev = idev->dev;
3829 struct nlattr *nla;
3830 struct ifinfomsg *hdr;
3831 struct nlmsghdr *nlh;
3832 void *protoinfo;
3833 struct ifla_cacheinfo ci;
3834
3835 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3836 if (nlh == NULL)
3837 return -EMSGSIZE;
3838
3839 hdr = nlmsg_data(nlh);
3840 hdr->ifi_family = AF_INET6;
3841 hdr->__ifi_pad = 0;
3842 hdr->ifi_type = dev->type;
3843 hdr->ifi_index = dev->ifindex;
3844 hdr->ifi_flags = dev_get_flags(dev);
3845 hdr->ifi_change = 0;
3846
3847 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
3848
3849 if (dev->addr_len)
3850 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3851
3852 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
3853 if (dev->ifindex != dev->iflink)
3854 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
3855
3856 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3857 if (protoinfo == NULL)
3858 goto nla_put_failure;
3859
3860 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
3861
3862 ci.max_reasm_len = IPV6_MAXPLEN;
3863 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3864 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3865 ci.reachable_time = idev->nd_parms->reachable_time;
3866 ci.retrans_time = idev->nd_parms->retrans_time;
3867 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3868
3869 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3870 if (nla == NULL)
3871 goto nla_put_failure;
3872 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
3873
3874 /* XXX - MC not implemented */
3875
3876 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3877 if (nla == NULL)
3878 goto nla_put_failure;
3879 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3880
3881 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3882 if (nla == NULL)
3883 goto nla_put_failure;
3884 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
3885
3886 nla_nest_end(skb, protoinfo);
3887 return nlmsg_end(skb, nlh);
3888
3889 nla_put_failure:
3890 nlmsg_cancel(skb, nlh);
3891 return -EMSGSIZE;
3892 }
3893
3894 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3895 {
3896 struct net *net = sock_net(skb->sk);
3897 int h, s_h;
3898 int idx = 0, s_idx;
3899 struct net_device *dev;
3900 struct inet6_dev *idev;
3901 struct hlist_head *head;
3902 struct hlist_node *node;
3903
3904 s_h = cb->args[0];
3905 s_idx = cb->args[1];
3906
3907 rcu_read_lock();
3908 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3909 idx = 0;
3910 head = &net->dev_index_head[h];
3911 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3912 if (idx < s_idx)
3913 goto cont;
3914 idev = __in6_dev_get(dev);
3915 if (!idev)
3916 goto cont;
3917 if (inet6_fill_ifinfo(skb, idev,
3918 NETLINK_CB(cb->skb).pid,
3919 cb->nlh->nlmsg_seq,
3920 RTM_NEWLINK, NLM_F_MULTI) <= 0)
3921 goto out;
3922 cont:
3923 idx++;
3924 }
3925 }
3926 out:
3927 rcu_read_unlock();
3928 cb->args[1] = idx;
3929 cb->args[0] = h;
3930
3931 return skb->len;
3932 }
3933
3934 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3935 {
3936 struct sk_buff *skb;
3937 struct net *net = dev_net(idev->dev);
3938 int err = -ENOBUFS;
3939
3940 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
3941 if (skb == NULL)
3942 goto errout;
3943
3944 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
3945 if (err < 0) {
3946 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3947 WARN_ON(err == -EMSGSIZE);
3948 kfree_skb(skb);
3949 goto errout;
3950 }
3951 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3952 return;
3953 errout:
3954 if (err < 0)
3955 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3956 }
3957
3958 static inline size_t inet6_prefix_nlmsg_size(void)
3959 {
3960 return NLMSG_ALIGN(sizeof(struct prefixmsg))
3961 + nla_total_size(sizeof(struct in6_addr))
3962 + nla_total_size(sizeof(struct prefix_cacheinfo));
3963 }
3964
3965 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
3966 struct prefix_info *pinfo, u32 pid, u32 seq,
3967 int event, unsigned int flags)
3968 {
3969 struct prefixmsg *pmsg;
3970 struct nlmsghdr *nlh;
3971 struct prefix_cacheinfo ci;
3972
3973 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
3974 if (nlh == NULL)
3975 return -EMSGSIZE;
3976
3977 pmsg = nlmsg_data(nlh);
3978 pmsg->prefix_family = AF_INET6;
3979 pmsg->prefix_pad1 = 0;
3980 pmsg->prefix_pad2 = 0;
3981 pmsg->prefix_ifindex = idev->dev->ifindex;
3982 pmsg->prefix_len = pinfo->prefix_len;
3983 pmsg->prefix_type = pinfo->type;
3984 pmsg->prefix_pad3 = 0;
3985 pmsg->prefix_flags = 0;
3986 if (pinfo->onlink)
3987 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3988 if (pinfo->autoconf)
3989 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3990
3991 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
3992
3993 ci.preferred_time = ntohl(pinfo->prefered);
3994 ci.valid_time = ntohl(pinfo->valid);
3995 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
3996
3997 return nlmsg_end(skb, nlh);
3998
3999 nla_put_failure:
4000 nlmsg_cancel(skb, nlh);
4001 return -EMSGSIZE;
4002 }
4003
4004 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
4005 struct prefix_info *pinfo)
4006 {
4007 struct sk_buff *skb;
4008 struct net *net = dev_net(idev->dev);
4009 int err = -ENOBUFS;
4010
4011 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
4012 if (skb == NULL)
4013 goto errout;
4014
4015 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
4016 if (err < 0) {
4017 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4018 WARN_ON(err == -EMSGSIZE);
4019 kfree_skb(skb);
4020 goto errout;
4021 }
4022 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4023 return;
4024 errout:
4025 if (err < 0)
4026 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
4027 }
4028
4029 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4030 {
4031 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4032
4033 switch (event) {
4034 case RTM_NEWADDR:
4035 /*
4036 * If the address was optimistic
4037 * we inserted the route at the start of
4038 * our DAD process, so we don't need
4039 * to do it again
4040 */
4041 if (!(ifp->rt->rt6i_node))
4042 ip6_ins_rt(ifp->rt);
4043 if (ifp->idev->cnf.forwarding)
4044 addrconf_join_anycast(ifp);
4045 break;
4046 case RTM_DELADDR:
4047 if (ifp->idev->cnf.forwarding)
4048 addrconf_leave_anycast(ifp);
4049 addrconf_leave_solict(ifp->idev, &ifp->addr);
4050 dst_hold(&ifp->rt->u.dst);
4051
4052 if (ifp->dead && ip6_del_rt(ifp->rt))
4053 dst_free(&ifp->rt->u.dst);
4054 break;
4055 }
4056 }
4057
4058 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4059 {
4060 rcu_read_lock_bh();
4061 if (likely(ifp->idev->dead == 0))
4062 __ipv6_ifa_notify(event, ifp);
4063 rcu_read_unlock_bh();
4064 }
4065
4066 #ifdef CONFIG_SYSCTL
4067
4068 static
4069 int addrconf_sysctl_forward(ctl_table *ctl, int write,
4070 void __user *buffer, size_t *lenp, loff_t *ppos)
4071 {
4072 int *valp = ctl->data;
4073 int val = *valp;
4074 loff_t pos = *ppos;
4075 int ret;
4076
4077 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
4078
4079 if (write)
4080 ret = addrconf_fixup_forwarding(ctl, valp, val);
4081 if (ret)
4082 *ppos = pos;
4083 return ret;
4084 }
4085
4086 static void dev_disable_change(struct inet6_dev *idev)
4087 {
4088 if (!idev || !idev->dev)
4089 return;
4090
4091 if (idev->cnf.disable_ipv6)
4092 addrconf_notify(NULL, NETDEV_DOWN, idev->dev);
4093 else
4094 addrconf_notify(NULL, NETDEV_UP, idev->dev);
4095 }
4096
4097 static void addrconf_disable_change(struct net *net, __s32 newf)
4098 {
4099 struct net_device *dev;
4100 struct inet6_dev *idev;
4101
4102 rcu_read_lock();
4103 for_each_netdev_rcu(net, dev) {
4104 idev = __in6_dev_get(dev);
4105 if (idev) {
4106 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4107 idev->cnf.disable_ipv6 = newf;
4108 if (changed)
4109 dev_disable_change(idev);
4110 }
4111 }
4112 rcu_read_unlock();
4113 }
4114
4115 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int old)
4116 {
4117 struct net *net;
4118
4119 net = (struct net *)table->extra2;
4120
4121 if (p == &net->ipv6.devconf_dflt->disable_ipv6)
4122 return 0;
4123
4124 if (!rtnl_trylock()) {
4125 /* Restore the original values before restarting */
4126 *p = old;
4127 return restart_syscall();
4128 }
4129
4130 if (p == &net->ipv6.devconf_all->disable_ipv6) {
4131 __s32 newf = net->ipv6.devconf_all->disable_ipv6;
4132 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4133 addrconf_disable_change(net, newf);
4134 } else if ((!*p) ^ (!old))
4135 dev_disable_change((struct inet6_dev *)table->extra1);
4136
4137 rtnl_unlock();
4138 return 0;
4139 }
4140
4141 static
4142 int addrconf_sysctl_disable(ctl_table *ctl, int write,
4143 void __user *buffer, size_t *lenp, loff_t *ppos)
4144 {
4145 int *valp = ctl->data;
4146 int val = *valp;
4147 loff_t pos = *ppos;
4148 int ret;
4149
4150 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
4151
4152 if (write)
4153 ret = addrconf_disable_ipv6(ctl, valp, val);
4154 if (ret)
4155 *ppos = pos;
4156 return ret;
4157 }
4158
4159 static struct addrconf_sysctl_table
4160 {
4161 struct ctl_table_header *sysctl_header;
4162 ctl_table addrconf_vars[DEVCONF_MAX+1];
4163 char *dev_name;
4164 } addrconf_sysctl __read_mostly = {
4165 .sysctl_header = NULL,
4166 .addrconf_vars = {
4167 {
4168 .procname = "forwarding",
4169 .data = &ipv6_devconf.forwarding,
4170 .maxlen = sizeof(int),
4171 .mode = 0644,
4172 .proc_handler = addrconf_sysctl_forward,
4173 },
4174 {
4175 .procname = "hop_limit",
4176 .data = &ipv6_devconf.hop_limit,
4177 .maxlen = sizeof(int),
4178 .mode = 0644,
4179 .proc_handler = proc_dointvec,
4180 },
4181 {
4182 .procname = "mtu",
4183 .data = &ipv6_devconf.mtu6,
4184 .maxlen = sizeof(int),
4185 .mode = 0644,
4186 .proc_handler = proc_dointvec,
4187 },
4188 {
4189 .procname = "accept_ra",
4190 .data = &ipv6_devconf.accept_ra,
4191 .maxlen = sizeof(int),
4192 .mode = 0644,
4193 .proc_handler = proc_dointvec,
4194 },
4195 {
4196 .procname = "accept_redirects",
4197 .data = &ipv6_devconf.accept_redirects,
4198 .maxlen = sizeof(int),
4199 .mode = 0644,
4200 .proc_handler = proc_dointvec,
4201 },
4202 {
4203 .procname = "autoconf",
4204 .data = &ipv6_devconf.autoconf,
4205 .maxlen = sizeof(int),
4206 .mode = 0644,
4207 .proc_handler = proc_dointvec,
4208 },
4209 {
4210 .procname = "dad_transmits",
4211 .data = &ipv6_devconf.dad_transmits,
4212 .maxlen = sizeof(int),
4213 .mode = 0644,
4214 .proc_handler = proc_dointvec,
4215 },
4216 {
4217 .procname = "router_solicitations",
4218 .data = &ipv6_devconf.rtr_solicits,
4219 .maxlen = sizeof(int),
4220 .mode = 0644,
4221 .proc_handler = proc_dointvec,
4222 },
4223 {
4224 .procname = "router_solicitation_interval",
4225 .data = &ipv6_devconf.rtr_solicit_interval,
4226 .maxlen = sizeof(int),
4227 .mode = 0644,
4228 .proc_handler = proc_dointvec_jiffies,
4229 },
4230 {
4231 .procname = "router_solicitation_delay",
4232 .data = &ipv6_devconf.rtr_solicit_delay,
4233 .maxlen = sizeof(int),
4234 .mode = 0644,
4235 .proc_handler = proc_dointvec_jiffies,
4236 },
4237 {
4238 .procname = "force_mld_version",
4239 .data = &ipv6_devconf.force_mld_version,
4240 .maxlen = sizeof(int),
4241 .mode = 0644,
4242 .proc_handler = proc_dointvec,
4243 },
4244 #ifdef CONFIG_IPV6_PRIVACY
4245 {
4246 .procname = "use_tempaddr",
4247 .data = &ipv6_devconf.use_tempaddr,
4248 .maxlen = sizeof(int),
4249 .mode = 0644,
4250 .proc_handler = proc_dointvec,
4251 },
4252 {
4253 .procname = "temp_valid_lft",
4254 .data = &ipv6_devconf.temp_valid_lft,
4255 .maxlen = sizeof(int),
4256 .mode = 0644,
4257 .proc_handler = proc_dointvec,
4258 },
4259 {
4260 .procname = "temp_prefered_lft",
4261 .data = &ipv6_devconf.temp_prefered_lft,
4262 .maxlen = sizeof(int),
4263 .mode = 0644,
4264 .proc_handler = proc_dointvec,
4265 },
4266 {
4267 .procname = "regen_max_retry",
4268 .data = &ipv6_devconf.regen_max_retry,
4269 .maxlen = sizeof(int),
4270 .mode = 0644,
4271 .proc_handler = proc_dointvec,
4272 },
4273 {
4274 .procname = "max_desync_factor",
4275 .data = &ipv6_devconf.max_desync_factor,
4276 .maxlen = sizeof(int),
4277 .mode = 0644,
4278 .proc_handler = proc_dointvec,
4279 },
4280 #endif
4281 {
4282 .procname = "max_addresses",
4283 .data = &ipv6_devconf.max_addresses,
4284 .maxlen = sizeof(int),
4285 .mode = 0644,
4286 .proc_handler = proc_dointvec,
4287 },
4288 {
4289 .procname = "accept_ra_defrtr",
4290 .data = &ipv6_devconf.accept_ra_defrtr,
4291 .maxlen = sizeof(int),
4292 .mode = 0644,
4293 .proc_handler = proc_dointvec,
4294 },
4295 {
4296 .procname = "accept_ra_pinfo",
4297 .data = &ipv6_devconf.accept_ra_pinfo,
4298 .maxlen = sizeof(int),
4299 .mode = 0644,
4300 .proc_handler = proc_dointvec,
4301 },
4302 #ifdef CONFIG_IPV6_ROUTER_PREF
4303 {
4304 .procname = "accept_ra_rtr_pref",
4305 .data = &ipv6_devconf.accept_ra_rtr_pref,
4306 .maxlen = sizeof(int),
4307 .mode = 0644,
4308 .proc_handler = proc_dointvec,
4309 },
4310 {
4311 .procname = "router_probe_interval",
4312 .data = &ipv6_devconf.rtr_probe_interval,
4313 .maxlen = sizeof(int),
4314 .mode = 0644,
4315 .proc_handler = proc_dointvec_jiffies,
4316 },
4317 #ifdef CONFIG_IPV6_ROUTE_INFO
4318 {
4319 .procname = "accept_ra_rt_info_max_plen",
4320 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4321 .maxlen = sizeof(int),
4322 .mode = 0644,
4323 .proc_handler = proc_dointvec,
4324 },
4325 #endif
4326 #endif
4327 {
4328 .procname = "proxy_ndp",
4329 .data = &ipv6_devconf.proxy_ndp,
4330 .maxlen = sizeof(int),
4331 .mode = 0644,
4332 .proc_handler = proc_dointvec,
4333 },
4334 {
4335 .procname = "accept_source_route",
4336 .data = &ipv6_devconf.accept_source_route,
4337 .maxlen = sizeof(int),
4338 .mode = 0644,
4339 .proc_handler = proc_dointvec,
4340 },
4341 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4342 {
4343 .procname = "optimistic_dad",
4344 .data = &ipv6_devconf.optimistic_dad,
4345 .maxlen = sizeof(int),
4346 .mode = 0644,
4347 .proc_handler = proc_dointvec,
4348
4349 },
4350 #endif
4351 #ifdef CONFIG_IPV6_MROUTE
4352 {
4353 .procname = "mc_forwarding",
4354 .data = &ipv6_devconf.mc_forwarding,
4355 .maxlen = sizeof(int),
4356 .mode = 0444,
4357 .proc_handler = proc_dointvec,
4358 },
4359 #endif
4360 {
4361 .procname = "disable_ipv6",
4362 .data = &ipv6_devconf.disable_ipv6,
4363 .maxlen = sizeof(int),
4364 .mode = 0644,
4365 .proc_handler = addrconf_sysctl_disable,
4366 },
4367 {
4368 .procname = "accept_dad",
4369 .data = &ipv6_devconf.accept_dad,
4370 .maxlen = sizeof(int),
4371 .mode = 0644,
4372 .proc_handler = proc_dointvec,
4373 },
4374 {
4375 .procname = "force_tllao",
4376 .data = &ipv6_devconf.force_tllao,
4377 .maxlen = sizeof(int),
4378 .mode = 0644,
4379 .proc_handler = proc_dointvec
4380 },
4381 {
4382 /* sentinel */
4383 }
4384 },
4385 };
4386
4387 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4388 struct inet6_dev *idev, struct ipv6_devconf *p)
4389 {
4390 int i;
4391 struct addrconf_sysctl_table *t;
4392
4393 #define ADDRCONF_CTL_PATH_DEV 3
4394
4395 struct ctl_path addrconf_ctl_path[] = {
4396 { .procname = "net", },
4397 { .procname = "ipv6", },
4398 { .procname = "conf", },
4399 { /* to be set */ },
4400 { },
4401 };
4402
4403
4404 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4405 if (t == NULL)
4406 goto out;
4407
4408 for (i = 0; t->addrconf_vars[i].data; i++) {
4409 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
4410 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4411 t->addrconf_vars[i].extra2 = net;
4412 }
4413
4414 /*
4415 * Make a copy of dev_name, because '.procname' is regarded as const
4416 * by sysctl and we wouldn't want anyone to change it under our feet
4417 * (see SIOCSIFNAME).
4418 */
4419 t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4420 if (!t->dev_name)
4421 goto free;
4422
4423 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
4424
4425 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
4426 t->addrconf_vars);
4427 if (t->sysctl_header == NULL)
4428 goto free_procname;
4429
4430 p->sysctl = t;
4431 return 0;
4432
4433 free_procname:
4434 kfree(t->dev_name);
4435 free:
4436 kfree(t);
4437 out:
4438 return -ENOBUFS;
4439 }
4440
4441 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4442 {
4443 struct addrconf_sysctl_table *t;
4444
4445 if (p->sysctl == NULL)
4446 return;
4447
4448 t = p->sysctl;
4449 p->sysctl = NULL;
4450 unregister_sysctl_table(t->sysctl_header);
4451 kfree(t->dev_name);
4452 kfree(t);
4453 }
4454
4455 static void addrconf_sysctl_register(struct inet6_dev *idev)
4456 {
4457 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
4458 &ndisc_ifinfo_sysctl_change);
4459 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
4460 idev, &idev->cnf);
4461 }
4462
4463 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
4464 {
4465 __addrconf_sysctl_unregister(&idev->cnf);
4466 neigh_sysctl_unregister(idev->nd_parms);
4467 }
4468
4469
4470 #endif
4471
4472 static int __net_init addrconf_init_net(struct net *net)
4473 {
4474 int err;
4475 struct ipv6_devconf *all, *dflt;
4476
4477 err = -ENOMEM;
4478 all = &ipv6_devconf;
4479 dflt = &ipv6_devconf_dflt;
4480
4481 if (!net_eq(net, &init_net)) {
4482 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4483 if (all == NULL)
4484 goto err_alloc_all;
4485
4486 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4487 if (dflt == NULL)
4488 goto err_alloc_dflt;
4489 } else {
4490 /* these will be inherited by all namespaces */
4491 dflt->autoconf = ipv6_defaults.autoconf;
4492 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
4493 }
4494
4495 net->ipv6.devconf_all = all;
4496 net->ipv6.devconf_dflt = dflt;
4497
4498 #ifdef CONFIG_SYSCTL
4499 err = __addrconf_sysctl_register(net, "all", NULL, all);
4500 if (err < 0)
4501 goto err_reg_all;
4502
4503 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
4504 if (err < 0)
4505 goto err_reg_dflt;
4506 #endif
4507 return 0;
4508
4509 #ifdef CONFIG_SYSCTL
4510 err_reg_dflt:
4511 __addrconf_sysctl_unregister(all);
4512 err_reg_all:
4513 kfree(dflt);
4514 #endif
4515 err_alloc_dflt:
4516 kfree(all);
4517 err_alloc_all:
4518 return err;
4519 }
4520
4521 static void __net_exit addrconf_exit_net(struct net *net)
4522 {
4523 #ifdef CONFIG_SYSCTL
4524 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4525 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4526 #endif
4527 if (!net_eq(net, &init_net)) {
4528 kfree(net->ipv6.devconf_dflt);
4529 kfree(net->ipv6.devconf_all);
4530 }
4531 }
4532
4533 static struct pernet_operations addrconf_ops = {
4534 .init = addrconf_init_net,
4535 .exit = addrconf_exit_net,
4536 };
4537
4538 /*
4539 * Device notifier
4540 */
4541
4542 int register_inet6addr_notifier(struct notifier_block *nb)
4543 {
4544 return atomic_notifier_chain_register(&inet6addr_chain, nb);
4545 }
4546 EXPORT_SYMBOL(register_inet6addr_notifier);
4547
4548 int unregister_inet6addr_notifier(struct notifier_block *nb)
4549 {
4550 return atomic_notifier_chain_unregister(&inet6addr_chain, nb);
4551 }
4552 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4553
4554 /*
4555 * Init / cleanup code
4556 */
4557
4558 int __init addrconf_init(void)
4559 {
4560 int i, err;
4561
4562 err = ipv6_addr_label_init();
4563 if (err < 0) {
4564 printk(KERN_CRIT "IPv6 Addrconf:"
4565 " cannot initialize default policy table: %d.\n", err);
4566 return err;
4567 }
4568
4569 register_pernet_subsys(&addrconf_ops);
4570
4571 /* The addrconf netdev notifier requires that loopback_dev
4572 * has it's ipv6 private information allocated and setup
4573 * before it can bring up and give link-local addresses
4574 * to other devices which are up.
4575 *
4576 * Unfortunately, loopback_dev is not necessarily the first
4577 * entry in the global dev_base list of net devices. In fact,
4578 * it is likely to be the very last entry on that list.
4579 * So this causes the notifier registry below to try and
4580 * give link-local addresses to all devices besides loopback_dev
4581 * first, then loopback_dev, which cases all the non-loopback_dev
4582 * devices to fail to get a link-local address.
4583 *
4584 * So, as a temporary fix, allocate the ipv6 structure for
4585 * loopback_dev first by hand.
4586 * Longer term, all of the dependencies ipv6 has upon the loopback
4587 * device and it being up should be removed.
4588 */
4589 rtnl_lock();
4590 if (!ipv6_add_dev(init_net.loopback_dev))
4591 err = -ENOMEM;
4592 rtnl_unlock();
4593 if (err)
4594 goto errlo;
4595
4596 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4597 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
4598
4599 register_netdevice_notifier(&ipv6_dev_notf);
4600
4601 addrconf_verify(0);
4602
4603 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4604 if (err < 0)
4605 goto errout;
4606
4607 /* Only the first call to __rtnl_register can fail */
4608 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4609 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4610 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4611 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4612 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4613
4614 ipv6_addr_label_rtnl_register();
4615
4616 return 0;
4617 errout:
4618 unregister_netdevice_notifier(&ipv6_dev_notf);
4619 errlo:
4620 unregister_pernet_subsys(&addrconf_ops);
4621
4622 return err;
4623 }
4624
4625 void addrconf_cleanup(void)
4626 {
4627 struct net_device *dev;
4628 int i;
4629
4630 unregister_netdevice_notifier(&ipv6_dev_notf);
4631 unregister_pernet_subsys(&addrconf_ops);
4632
4633 rtnl_lock();
4634
4635 /* clean dev list */
4636 for_each_netdev(&init_net, dev) {
4637 if (__in6_dev_get(dev) == NULL)
4638 continue;
4639 addrconf_ifdown(dev, 1);
4640 }
4641 addrconf_ifdown(init_net.loopback_dev, 2);
4642
4643 /*
4644 * Check hash table.
4645 */
4646 spin_lock_bh(&addrconf_hash_lock);
4647 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4648 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
4649 spin_unlock_bh(&addrconf_hash_lock);
4650
4651 del_timer(&addr_chk_timer);
4652 rtnl_unlock();
4653 }
Linux kernel - Deliverables
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