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pda_power: Add function callbacks for suspend and resume
[firewire-audio.git] / net / ipv6 / addrconf.c
blob7e567ae5eaab052d482a296db7ff4457114eef78
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 #ifdef CONFIG_SYSCTL
57 #include <linux/sysctl.h>
58 #endif
59 #include <linux/capability.h>
60 #include <linux/delay.h>
61 #include <linux/notifier.h>
62 #include <linux/string.h>
63
64 #include <net/net_namespace.h>
65 #include <net/sock.h>
66 #include <net/snmp.h>
67
68 #include <net/ipv6.h>
69 #include <net/protocol.h>
70 #include <net/ndisc.h>
71 #include <net/ip6_route.h>
72 #include <net/addrconf.h>
73 #include <net/tcp.h>
74 #include <net/ip.h>
75 #include <net/netlink.h>
76 #include <net/pkt_sched.h>
77 #include <linux/if_tunnel.h>
78 #include <linux/rtnetlink.h>
79
80 #ifdef CONFIG_IPV6_PRIVACY
81 #include <linux/random.h>
82 #endif
83
84 #include <asm/uaccess.h>
85 #include <asm/unaligned.h>
86
87 #include <linux/proc_fs.h>
88 #include <linux/seq_file.h>
89
90 /* Set to 3 to get tracing... */
91 #define ACONF_DEBUG 2
92
93 #if ACONF_DEBUG >= 3
94 #define ADBG(x) printk x
95 #else
96 #define ADBG(x)
97 #endif
98
99 #define INFINITY_LIFE_TIME 0xFFFFFFFF
100 #define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b)))
101
102 #ifdef CONFIG_SYSCTL
103 static void addrconf_sysctl_register(struct inet6_dev *idev);
104 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
105 #else
106 static inline void addrconf_sysctl_register(struct inet6_dev *idev)
107 {
108 }
109
110 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
111 {
112 }
113 #endif
114
115 #ifdef CONFIG_IPV6_PRIVACY
116 static int __ipv6_regen_rndid(struct inet6_dev *idev);
117 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
118 static void ipv6_regen_rndid(unsigned long data);
119
120 static int desync_factor = MAX_DESYNC_FACTOR * HZ;
121 #endif
122
123 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
124 static int ipv6_count_addresses(struct inet6_dev *idev);
125
126 /*
127 * Configured unicast address hash table
128 */
129 static struct inet6_ifaddr *inet6_addr_lst[IN6_ADDR_HSIZE];
130 static DEFINE_RWLOCK(addrconf_hash_lock);
131
132 static void addrconf_verify(unsigned long);
133
134 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
135 static DEFINE_SPINLOCK(addrconf_verify_lock);
136
137 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
138 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
139
140 static void addrconf_bonding_change(struct net_device *dev,
141 unsigned long event);
142 static int addrconf_ifdown(struct net_device *dev, int how);
143
144 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
145 static void addrconf_dad_timer(unsigned long data);
146 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
147 static void addrconf_dad_run(struct inet6_dev *idev);
148 static void addrconf_rs_timer(unsigned long data);
149 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
150 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
151
152 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
153 struct prefix_info *pinfo);
154 static int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
155 struct net_device *dev);
156
157 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
158
159 static struct ipv6_devconf ipv6_devconf __read_mostly = {
160 .forwarding = 0,
161 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
162 .mtu6 = IPV6_MIN_MTU,
163 .accept_ra = 1,
164 .accept_redirects = 1,
165 .autoconf = 1,
166 .force_mld_version = 0,
167 .dad_transmits = 1,
168 .rtr_solicits = MAX_RTR_SOLICITATIONS,
169 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
170 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
171 #ifdef CONFIG_IPV6_PRIVACY
172 .use_tempaddr = 0,
173 .temp_valid_lft = TEMP_VALID_LIFETIME,
174 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
175 .regen_max_retry = REGEN_MAX_RETRY,
176 .max_desync_factor = MAX_DESYNC_FACTOR,
177 #endif
178 .max_addresses = IPV6_MAX_ADDRESSES,
179 .accept_ra_defrtr = 1,
180 .accept_ra_pinfo = 1,
181 #ifdef CONFIG_IPV6_ROUTER_PREF
182 .accept_ra_rtr_pref = 1,
183 .rtr_probe_interval = 60 * HZ,
184 #ifdef CONFIG_IPV6_ROUTE_INFO
185 .accept_ra_rt_info_max_plen = 0,
186 #endif
187 #endif
188 .proxy_ndp = 0,
189 .accept_source_route = 0, /* we do not accept RH0 by default. */
190 .disable_ipv6 = 0,
191 .accept_dad = 1,
192 };
193
194 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
195 .forwarding = 0,
196 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
197 .mtu6 = IPV6_MIN_MTU,
198 .accept_ra = 1,
199 .accept_redirects = 1,
200 .autoconf = 1,
201 .dad_transmits = 1,
202 .rtr_solicits = MAX_RTR_SOLICITATIONS,
203 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
204 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
205 #ifdef CONFIG_IPV6_PRIVACY
206 .use_tempaddr = 0,
207 .temp_valid_lft = TEMP_VALID_LIFETIME,
208 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
209 .regen_max_retry = REGEN_MAX_RETRY,
210 .max_desync_factor = MAX_DESYNC_FACTOR,
211 #endif
212 .max_addresses = IPV6_MAX_ADDRESSES,
213 .accept_ra_defrtr = 1,
214 .accept_ra_pinfo = 1,
215 #ifdef CONFIG_IPV6_ROUTER_PREF
216 .accept_ra_rtr_pref = 1,
217 .rtr_probe_interval = 60 * HZ,
218 #ifdef CONFIG_IPV6_ROUTE_INFO
219 .accept_ra_rt_info_max_plen = 0,
220 #endif
221 #endif
222 .proxy_ndp = 0,
223 .accept_source_route = 0, /* we do not accept RH0 by default. */
224 .disable_ipv6 = 0,
225 .accept_dad = 1,
226 };
227
228 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
229 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
230 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
231 const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
232 const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
233
234 /* Check if a valid qdisc is available */
235 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
236 {
237 return !qdisc_tx_is_noop(dev);
238 }
239
240 /* Check if a route is valid prefix route */
241 static inline int addrconf_is_prefix_route(const struct rt6_info *rt)
242 {
243 return ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0);
244 }
245
246 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
247 {
248 if (del_timer(&ifp->timer))
249 __in6_ifa_put(ifp);
250 }
251
252 enum addrconf_timer_t
253 {
254 AC_NONE,
255 AC_DAD,
256 AC_RS,
257 };
258
259 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
260 enum addrconf_timer_t what,
261 unsigned long when)
262 {
263 if (!del_timer(&ifp->timer))
264 in6_ifa_hold(ifp);
265
266 switch (what) {
267 case AC_DAD:
268 ifp->timer.function = addrconf_dad_timer;
269 break;
270 case AC_RS:
271 ifp->timer.function = addrconf_rs_timer;
272 break;
273 default:;
274 }
275 ifp->timer.expires = jiffies + when;
276 add_timer(&ifp->timer);
277 }
278
279 static int snmp6_alloc_dev(struct inet6_dev *idev)
280 {
281 if (snmp_mib_init((void __percpu **)idev->stats.ipv6,
282 sizeof(struct ipstats_mib)) < 0)
283 goto err_ip;
284 if (snmp_mib_init((void __percpu **)idev->stats.icmpv6,
285 sizeof(struct icmpv6_mib)) < 0)
286 goto err_icmp;
287 if (snmp_mib_init((void __percpu **)idev->stats.icmpv6msg,
288 sizeof(struct icmpv6msg_mib)) < 0)
289 goto err_icmpmsg;
290
291 return 0;
292
293 err_icmpmsg:
294 snmp_mib_free((void __percpu **)idev->stats.icmpv6);
295 err_icmp:
296 snmp_mib_free((void __percpu **)idev->stats.ipv6);
297 err_ip:
298 return -ENOMEM;
299 }
300
301 static void snmp6_free_dev(struct inet6_dev *idev)
302 {
303 snmp_mib_free((void __percpu **)idev->stats.icmpv6msg);
304 snmp_mib_free((void __percpu **)idev->stats.icmpv6);
305 snmp_mib_free((void __percpu **)idev->stats.ipv6);
306 }
307
308 /* Nobody refers to this device, we may destroy it. */
309
310 static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
311 {
312 struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
313 kfree(idev);
314 }
315
316 void in6_dev_finish_destroy(struct inet6_dev *idev)
317 {
318 struct net_device *dev = idev->dev;
319
320 WARN_ON(idev->addr_list != NULL);
321 WARN_ON(idev->mc_list != NULL);
322
323 #ifdef NET_REFCNT_DEBUG
324 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
325 #endif
326 dev_put(dev);
327 if (!idev->dead) {
328 printk("Freeing alive inet6 device %p\n", idev);
329 return;
330 }
331 snmp6_free_dev(idev);
332 call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
333 }
334
335 EXPORT_SYMBOL(in6_dev_finish_destroy);
336
337 static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
338 {
339 struct inet6_dev *ndev;
340
341 ASSERT_RTNL();
342
343 if (dev->mtu < IPV6_MIN_MTU)
344 return NULL;
345
346 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
347
348 if (ndev == NULL)
349 return NULL;
350
351 rwlock_init(&ndev->lock);
352 ndev->dev = dev;
353 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
354 ndev->cnf.mtu6 = dev->mtu;
355 ndev->cnf.sysctl = NULL;
356 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
357 if (ndev->nd_parms == NULL) {
358 kfree(ndev);
359 return NULL;
360 }
361 if (ndev->cnf.forwarding)
362 dev_disable_lro(dev);
363 /* We refer to the device */
364 dev_hold(dev);
365
366 if (snmp6_alloc_dev(ndev) < 0) {
367 ADBG((KERN_WARNING
368 "%s(): cannot allocate memory for statistics; dev=%s.\n",
369 __func__, dev->name));
370 neigh_parms_release(&nd_tbl, ndev->nd_parms);
371 ndev->dead = 1;
372 in6_dev_finish_destroy(ndev);
373 return NULL;
374 }
375
376 if (snmp6_register_dev(ndev) < 0) {
377 ADBG((KERN_WARNING
378 "%s(): cannot create /proc/net/dev_snmp6/%s\n",
379 __func__, dev->name));
380 neigh_parms_release(&nd_tbl, ndev->nd_parms);
381 ndev->dead = 1;
382 in6_dev_finish_destroy(ndev);
383 return NULL;
384 }
385
386 /* One reference from device. We must do this before
387 * we invoke __ipv6_regen_rndid().
388 */
389 in6_dev_hold(ndev);
390
391 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
392 ndev->cnf.accept_dad = -1;
393
394 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
395 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
396 printk(KERN_INFO
397 "%s: Disabled Multicast RS\n",
398 dev->name);
399 ndev->cnf.rtr_solicits = 0;
400 }
401 #endif
402
403 #ifdef CONFIG_IPV6_PRIVACY
404 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
405 if ((dev->flags&IFF_LOOPBACK) ||
406 dev->type == ARPHRD_TUNNEL ||
407 dev->type == ARPHRD_TUNNEL6 ||
408 dev->type == ARPHRD_SIT ||
409 dev->type == ARPHRD_NONE) {
410 printk(KERN_INFO
411 "%s: Disabled Privacy Extensions\n",
412 dev->name);
413 ndev->cnf.use_tempaddr = -1;
414 } else {
415 in6_dev_hold(ndev);
416 ipv6_regen_rndid((unsigned long) ndev);
417 }
418 #endif
419
420 if (netif_running(dev) && addrconf_qdisc_ok(dev))
421 ndev->if_flags |= IF_READY;
422
423 ipv6_mc_init_dev(ndev);
424 ndev->tstamp = jiffies;
425 addrconf_sysctl_register(ndev);
426 /* protected by rtnl_lock */
427 rcu_assign_pointer(dev->ip6_ptr, ndev);
428
429 /* Join all-node multicast group */
430 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
431
432 return ndev;
433 }
434
435 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
436 {
437 struct inet6_dev *idev;
438
439 ASSERT_RTNL();
440
441 if ((idev = __in6_dev_get(dev)) == NULL) {
442 if ((idev = ipv6_add_dev(dev)) == NULL)
443 return NULL;
444 }
445
446 if (dev->flags&IFF_UP)
447 ipv6_mc_up(idev);
448 return idev;
449 }
450
451 #ifdef CONFIG_SYSCTL
452 static void dev_forward_change(struct inet6_dev *idev)
453 {
454 struct net_device *dev;
455 struct inet6_ifaddr *ifa;
456
457 if (!idev)
458 return;
459 dev = idev->dev;
460 if (idev->cnf.forwarding)
461 dev_disable_lro(dev);
462 if (dev && (dev->flags & IFF_MULTICAST)) {
463 if (idev->cnf.forwarding)
464 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
465 else
466 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
467 }
468 for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
469 if (ifa->flags&IFA_F_TENTATIVE)
470 continue;
471 if (idev->cnf.forwarding)
472 addrconf_join_anycast(ifa);
473 else
474 addrconf_leave_anycast(ifa);
475 }
476 }
477
478
479 static void addrconf_forward_change(struct net *net, __s32 newf)
480 {
481 struct net_device *dev;
482 struct inet6_dev *idev;
483
484 rcu_read_lock();
485 for_each_netdev_rcu(net, dev) {
486 idev = __in6_dev_get(dev);
487 if (idev) {
488 int changed = (!idev->cnf.forwarding) ^ (!newf);
489 idev->cnf.forwarding = newf;
490 if (changed)
491 dev_forward_change(idev);
492 }
493 }
494 rcu_read_unlock();
495 }
496
497 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old)
498 {
499 struct net *net;
500
501 net = (struct net *)table->extra2;
502 if (p == &net->ipv6.devconf_dflt->forwarding)
503 return 0;
504
505 if (!rtnl_trylock()) {
506 /* Restore the original values before restarting */
507 *p = old;
508 return restart_syscall();
509 }
510
511 if (p == &net->ipv6.devconf_all->forwarding) {
512 __s32 newf = net->ipv6.devconf_all->forwarding;
513 net->ipv6.devconf_dflt->forwarding = newf;
514 addrconf_forward_change(net, newf);
515 } else if ((!*p) ^ (!old))
516 dev_forward_change((struct inet6_dev *)table->extra1);
517 rtnl_unlock();
518
519 if (*p)
520 rt6_purge_dflt_routers(net);
521 return 1;
522 }
523 #endif
524
525 /* Nobody refers to this ifaddr, destroy it */
526
527 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
528 {
529 WARN_ON(ifp->if_next != NULL);
530 WARN_ON(ifp->lst_next != NULL);
531
532 #ifdef NET_REFCNT_DEBUG
533 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
534 #endif
535
536 in6_dev_put(ifp->idev);
537
538 if (del_timer(&ifp->timer))
539 printk("Timer is still running, when freeing ifa=%p\n", ifp);
540
541 if (!ifp->dead) {
542 printk("Freeing alive inet6 address %p\n", ifp);
543 return;
544 }
545 dst_release(&ifp->rt->u.dst);
546
547 kfree(ifp);
548 }
549
550 static void
551 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
552 {
553 struct inet6_ifaddr *ifa, **ifap;
554 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
555
556 /*
557 * Each device address list is sorted in order of scope -
558 * global before linklocal.
559 */
560 for (ifap = &idev->addr_list; (ifa = *ifap) != NULL;
561 ifap = &ifa->if_next) {
562 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
563 break;
564 }
565
566 ifp->if_next = *ifap;
567 *ifap = ifp;
568 }
569
570 /*
571 * Hash function taken from net_alias.c
572 */
573 static u8 ipv6_addr_hash(const struct in6_addr *addr)
574 {
575 __u32 word;
576
577 /*
578 * We perform the hash function over the last 64 bits of the address
579 * This will include the IEEE address token on links that support it.
580 */
581
582 word = (__force u32)(addr->s6_addr32[2] ^ addr->s6_addr32[3]);
583 word ^= (word >> 16);
584 word ^= (word >> 8);
585
586 return ((word ^ (word >> 4)) & 0x0f);
587 }
588
589 /* On success it returns ifp with increased reference count */
590
591 static struct inet6_ifaddr *
592 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
593 int scope, u32 flags)
594 {
595 struct inet6_ifaddr *ifa = NULL;
596 struct rt6_info *rt;
597 int hash;
598 int err = 0;
599 int addr_type = ipv6_addr_type(addr);
600
601 if (addr_type == IPV6_ADDR_ANY ||
602 addr_type & IPV6_ADDR_MULTICAST ||
603 (!(idev->dev->flags & IFF_LOOPBACK) &&
604 addr_type & IPV6_ADDR_LOOPBACK))
605 return ERR_PTR(-EADDRNOTAVAIL);
606
607 rcu_read_lock_bh();
608 if (idev->dead) {
609 err = -ENODEV; /*XXX*/
610 goto out2;
611 }
612
613 if (idev->cnf.disable_ipv6) {
614 err = -EACCES;
615 goto out2;
616 }
617
618 write_lock(&addrconf_hash_lock);
619
620 /* Ignore adding duplicate addresses on an interface */
621 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
622 ADBG(("ipv6_add_addr: already assigned\n"));
623 err = -EEXIST;
624 goto out;
625 }
626
627 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
628
629 if (ifa == NULL) {
630 ADBG(("ipv6_add_addr: malloc failed\n"));
631 err = -ENOBUFS;
632 goto out;
633 }
634
635 rt = addrconf_dst_alloc(idev, addr, 0);
636 if (IS_ERR(rt)) {
637 err = PTR_ERR(rt);
638 goto out;
639 }
640
641 ipv6_addr_copy(&ifa->addr, addr);
642
643 spin_lock_init(&ifa->lock);
644 init_timer(&ifa->timer);
645 ifa->timer.data = (unsigned long) ifa;
646 ifa->scope = scope;
647 ifa->prefix_len = pfxlen;
648 ifa->flags = flags | IFA_F_TENTATIVE;
649 ifa->cstamp = ifa->tstamp = jiffies;
650
651 ifa->rt = rt;
652
653 /*
654 * part one of RFC 4429, section 3.3
655 * We should not configure an address as
656 * optimistic if we do not yet know the link
657 * layer address of our nexhop router
658 */
659
660 if (rt->rt6i_nexthop == NULL)
661 ifa->flags &= ~IFA_F_OPTIMISTIC;
662
663 ifa->idev = idev;
664 in6_dev_hold(idev);
665 /* For caller */
666 in6_ifa_hold(ifa);
667
668 /* Add to big hash table */
669 hash = ipv6_addr_hash(addr);
670
671 ifa->lst_next = inet6_addr_lst[hash];
672 inet6_addr_lst[hash] = ifa;
673 in6_ifa_hold(ifa);
674 write_unlock(&addrconf_hash_lock);
675
676 write_lock(&idev->lock);
677 /* Add to inet6_dev unicast addr list. */
678 ipv6_link_dev_addr(idev, ifa);
679
680 #ifdef CONFIG_IPV6_PRIVACY
681 if (ifa->flags&IFA_F_TEMPORARY) {
682 ifa->tmp_next = idev->tempaddr_list;
683 idev->tempaddr_list = ifa;
684 in6_ifa_hold(ifa);
685 }
686 #endif
687
688 in6_ifa_hold(ifa);
689 write_unlock(&idev->lock);
690 out2:
691 rcu_read_unlock_bh();
692
693 if (likely(err == 0))
694 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
695 else {
696 kfree(ifa);
697 ifa = ERR_PTR(err);
698 }
699
700 return ifa;
701 out:
702 write_unlock(&addrconf_hash_lock);
703 goto out2;
704 }
705
706 /* This function wants to get referenced ifp and releases it before return */
707
708 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
709 {
710 struct inet6_ifaddr *ifa, **ifap;
711 struct inet6_dev *idev = ifp->idev;
712 int hash;
713 int deleted = 0, onlink = 0;
714 unsigned long expires = jiffies;
715
716 hash = ipv6_addr_hash(&ifp->addr);
717
718 ifp->dead = 1;
719
720 write_lock_bh(&addrconf_hash_lock);
721 for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
722 ifap = &ifa->lst_next) {
723 if (ifa == ifp) {
724 *ifap = ifa->lst_next;
725 __in6_ifa_put(ifp);
726 ifa->lst_next = NULL;
727 break;
728 }
729 }
730 write_unlock_bh(&addrconf_hash_lock);
731
732 write_lock_bh(&idev->lock);
733 #ifdef CONFIG_IPV6_PRIVACY
734 if (ifp->flags&IFA_F_TEMPORARY) {
735 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
736 ifap = &ifa->tmp_next) {
737 if (ifa == ifp) {
738 *ifap = ifa->tmp_next;
739 if (ifp->ifpub) {
740 in6_ifa_put(ifp->ifpub);
741 ifp->ifpub = NULL;
742 }
743 __in6_ifa_put(ifp);
744 ifa->tmp_next = NULL;
745 break;
746 }
747 }
748 }
749 #endif
750
751 for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
752 if (ifa == ifp) {
753 *ifap = ifa->if_next;
754 __in6_ifa_put(ifp);
755 ifa->if_next = NULL;
756 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
757 break;
758 deleted = 1;
759 continue;
760 } else if (ifp->flags & IFA_F_PERMANENT) {
761 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
762 ifp->prefix_len)) {
763 if (ifa->flags & IFA_F_PERMANENT) {
764 onlink = 1;
765 if (deleted)
766 break;
767 } else {
768 unsigned long lifetime;
769
770 if (!onlink)
771 onlink = -1;
772
773 spin_lock(&ifa->lock);
774
775 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
776 /*
777 * Note: Because this address is
778 * not permanent, lifetime <
779 * LONG_MAX / HZ here.
780 */
781 if (time_before(expires,
782 ifa->tstamp + lifetime * HZ))
783 expires = ifa->tstamp + lifetime * HZ;
784 spin_unlock(&ifa->lock);
785 }
786 }
787 }
788 ifap = &ifa->if_next;
789 }
790 write_unlock_bh(&idev->lock);
791
792 addrconf_del_timer(ifp);
793
794 ipv6_ifa_notify(RTM_DELADDR, ifp);
795
796 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
797
798 /*
799 * Purge or update corresponding prefix
800 *
801 * 1) we don't purge prefix here if address was not permanent.
802 * prefix is managed by its own lifetime.
803 * 2) if there're no addresses, delete prefix.
804 * 3) if there're still other permanent address(es),
805 * corresponding prefix is still permanent.
806 * 4) otherwise, update prefix lifetime to the
807 * longest valid lifetime among the corresponding
808 * addresses on the device.
809 * Note: subsequent RA will update lifetime.
810 *
811 * --yoshfuji
812 */
813 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
814 struct in6_addr prefix;
815 struct rt6_info *rt;
816 struct net *net = dev_net(ifp->idev->dev);
817 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
818 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1);
819
820 if (rt && addrconf_is_prefix_route(rt)) {
821 if (onlink == 0) {
822 ip6_del_rt(rt);
823 rt = NULL;
824 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
825 rt->rt6i_expires = expires;
826 rt->rt6i_flags |= RTF_EXPIRES;
827 }
828 }
829 dst_release(&rt->u.dst);
830 }
831
832 in6_ifa_put(ifp);
833 }
834
835 #ifdef CONFIG_IPV6_PRIVACY
836 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
837 {
838 struct inet6_dev *idev = ifp->idev;
839 struct in6_addr addr, *tmpaddr;
840 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
841 unsigned long regen_advance;
842 int tmp_plen;
843 int ret = 0;
844 int max_addresses;
845 u32 addr_flags;
846
847 write_lock(&idev->lock);
848 if (ift) {
849 spin_lock_bh(&ift->lock);
850 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
851 spin_unlock_bh(&ift->lock);
852 tmpaddr = &addr;
853 } else {
854 tmpaddr = NULL;
855 }
856 retry:
857 in6_dev_hold(idev);
858 if (idev->cnf.use_tempaddr <= 0) {
859 write_unlock(&idev->lock);
860 printk(KERN_INFO
861 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
862 in6_dev_put(idev);
863 ret = -1;
864 goto out;
865 }
866 spin_lock_bh(&ifp->lock);
867 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
868 idev->cnf.use_tempaddr = -1; /*XXX*/
869 spin_unlock_bh(&ifp->lock);
870 write_unlock(&idev->lock);
871 printk(KERN_WARNING
872 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
873 in6_dev_put(idev);
874 ret = -1;
875 goto out;
876 }
877 in6_ifa_hold(ifp);
878 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
879 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
880 spin_unlock_bh(&ifp->lock);
881 write_unlock(&idev->lock);
882 printk(KERN_WARNING
883 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
884 in6_ifa_put(ifp);
885 in6_dev_put(idev);
886 ret = -1;
887 goto out;
888 }
889 memcpy(&addr.s6_addr[8], idev->rndid, 8);
890 tmp_valid_lft = min_t(__u32,
891 ifp->valid_lft,
892 idev->cnf.temp_valid_lft);
893 tmp_prefered_lft = min_t(__u32,
894 ifp->prefered_lft,
895 idev->cnf.temp_prefered_lft - desync_factor / HZ);
896 tmp_plen = ifp->prefix_len;
897 max_addresses = idev->cnf.max_addresses;
898 tmp_cstamp = ifp->cstamp;
899 tmp_tstamp = ifp->tstamp;
900 spin_unlock_bh(&ifp->lock);
901
902 regen_advance = idev->cnf.regen_max_retry *
903 idev->cnf.dad_transmits *
904 idev->nd_parms->retrans_time / HZ;
905 write_unlock(&idev->lock);
906
907 /* A temporary address is created only if this calculated Preferred
908 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
909 * an implementation must not create a temporary address with a zero
910 * Preferred Lifetime.
911 */
912 if (tmp_prefered_lft <= regen_advance) {
913 in6_ifa_put(ifp);
914 in6_dev_put(idev);
915 ret = -1;
916 goto out;
917 }
918
919 addr_flags = IFA_F_TEMPORARY;
920 /* set in addrconf_prefix_rcv() */
921 if (ifp->flags & IFA_F_OPTIMISTIC)
922 addr_flags |= IFA_F_OPTIMISTIC;
923
924 ift = !max_addresses ||
925 ipv6_count_addresses(idev) < max_addresses ?
926 ipv6_add_addr(idev, &addr, tmp_plen,
927 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
928 addr_flags) : NULL;
929 if (!ift || IS_ERR(ift)) {
930 in6_ifa_put(ifp);
931 in6_dev_put(idev);
932 printk(KERN_INFO
933 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
934 tmpaddr = &addr;
935 write_lock(&idev->lock);
936 goto retry;
937 }
938
939 spin_lock_bh(&ift->lock);
940 ift->ifpub = ifp;
941 ift->valid_lft = tmp_valid_lft;
942 ift->prefered_lft = tmp_prefered_lft;
943 ift->cstamp = tmp_cstamp;
944 ift->tstamp = tmp_tstamp;
945 spin_unlock_bh(&ift->lock);
946
947 addrconf_dad_start(ift, 0);
948 in6_ifa_put(ift);
949 in6_dev_put(idev);
950 out:
951 return ret;
952 }
953 #endif
954
955 /*
956 * Choose an appropriate source address (RFC3484)
957 */
958 enum {
959 IPV6_SADDR_RULE_INIT = 0,
960 IPV6_SADDR_RULE_LOCAL,
961 IPV6_SADDR_RULE_SCOPE,
962 IPV6_SADDR_RULE_PREFERRED,
963 #ifdef CONFIG_IPV6_MIP6
964 IPV6_SADDR_RULE_HOA,
965 #endif
966 IPV6_SADDR_RULE_OIF,
967 IPV6_SADDR_RULE_LABEL,
968 #ifdef CONFIG_IPV6_PRIVACY
969 IPV6_SADDR_RULE_PRIVACY,
970 #endif
971 IPV6_SADDR_RULE_ORCHID,
972 IPV6_SADDR_RULE_PREFIX,
973 IPV6_SADDR_RULE_MAX
974 };
975
976 struct ipv6_saddr_score {
977 int rule;
978 int addr_type;
979 struct inet6_ifaddr *ifa;
980 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
981 int scopedist;
982 int matchlen;
983 };
984
985 struct ipv6_saddr_dst {
986 const struct in6_addr *addr;
987 int ifindex;
988 int scope;
989 int label;
990 unsigned int prefs;
991 };
992
993 static inline int ipv6_saddr_preferred(int type)
994 {
995 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
996 return 1;
997 return 0;
998 }
999
1000 static int ipv6_get_saddr_eval(struct net *net,
1001 struct ipv6_saddr_score *score,
1002 struct ipv6_saddr_dst *dst,
1003 int i)
1004 {
1005 int ret;
1006
1007 if (i <= score->rule) {
1008 switch (i) {
1009 case IPV6_SADDR_RULE_SCOPE:
1010 ret = score->scopedist;
1011 break;
1012 case IPV6_SADDR_RULE_PREFIX:
1013 ret = score->matchlen;
1014 break;
1015 default:
1016 ret = !!test_bit(i, score->scorebits);
1017 }
1018 goto out;
1019 }
1020
1021 switch (i) {
1022 case IPV6_SADDR_RULE_INIT:
1023 /* Rule 0: remember if hiscore is not ready yet */
1024 ret = !!score->ifa;
1025 break;
1026 case IPV6_SADDR_RULE_LOCAL:
1027 /* Rule 1: Prefer same address */
1028 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1029 break;
1030 case IPV6_SADDR_RULE_SCOPE:
1031 /* Rule 2: Prefer appropriate scope
1032 *
1033 * ret
1034 * ^
1035 * -1 | d 15
1036 * ---+--+-+---> scope
1037 * |
1038 * | d is scope of the destination.
1039 * B-d | \
1040 * | \ <- smaller scope is better if
1041 * B-15 | \ if scope is enough for destinaion.
1042 * | ret = B - scope (-1 <= scope >= d <= 15).
1043 * d-C-1 | /
1044 * |/ <- greater is better
1045 * -C / if scope is not enough for destination.
1046 * /| ret = scope - C (-1 <= d < scope <= 15).
1047 *
1048 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1049 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1050 * Assume B = 0 and we get C > 29.
1051 */
1052 ret = __ipv6_addr_src_scope(score->addr_type);
1053 if (ret >= dst->scope)
1054 ret = -ret;
1055 else
1056 ret -= 128; /* 30 is enough */
1057 score->scopedist = ret;
1058 break;
1059 case IPV6_SADDR_RULE_PREFERRED:
1060 /* Rule 3: Avoid deprecated and optimistic addresses */
1061 ret = ipv6_saddr_preferred(score->addr_type) ||
1062 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1063 break;
1064 #ifdef CONFIG_IPV6_MIP6
1065 case IPV6_SADDR_RULE_HOA:
1066 {
1067 /* Rule 4: Prefer home address */
1068 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1069 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1070 break;
1071 }
1072 #endif
1073 case IPV6_SADDR_RULE_OIF:
1074 /* Rule 5: Prefer outgoing interface */
1075 ret = (!dst->ifindex ||
1076 dst->ifindex == score->ifa->idev->dev->ifindex);
1077 break;
1078 case IPV6_SADDR_RULE_LABEL:
1079 /* Rule 6: Prefer matching label */
1080 ret = ipv6_addr_label(net,
1081 &score->ifa->addr, score->addr_type,
1082 score->ifa->idev->dev->ifindex) == dst->label;
1083 break;
1084 #ifdef CONFIG_IPV6_PRIVACY
1085 case IPV6_SADDR_RULE_PRIVACY:
1086 {
1087 /* Rule 7: Prefer public address
1088 * Note: prefer temprary address if use_tempaddr >= 2
1089 */
1090 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1091 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1092 score->ifa->idev->cnf.use_tempaddr >= 2;
1093 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1094 break;
1095 }
1096 #endif
1097 case IPV6_SADDR_RULE_ORCHID:
1098 /* Rule 8-: Prefer ORCHID vs ORCHID or
1099 * non-ORCHID vs non-ORCHID
1100 */
1101 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1102 ipv6_addr_orchid(dst->addr));
1103 break;
1104 case IPV6_SADDR_RULE_PREFIX:
1105 /* Rule 8: Use longest matching prefix */
1106 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr,
1107 dst->addr);
1108 break;
1109 default:
1110 ret = 0;
1111 }
1112
1113 if (ret)
1114 __set_bit(i, score->scorebits);
1115 score->rule = i;
1116 out:
1117 return ret;
1118 }
1119
1120 int ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev,
1121 const struct in6_addr *daddr, unsigned int prefs,
1122 struct in6_addr *saddr)
1123 {
1124 struct ipv6_saddr_score scores[2],
1125 *score = &scores[0], *hiscore = &scores[1];
1126 struct ipv6_saddr_dst dst;
1127 struct net_device *dev;
1128 int dst_type;
1129
1130 dst_type = __ipv6_addr_type(daddr);
1131 dst.addr = daddr;
1132 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1133 dst.scope = __ipv6_addr_src_scope(dst_type);
1134 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1135 dst.prefs = prefs;
1136
1137 hiscore->rule = -1;
1138 hiscore->ifa = NULL;
1139
1140 rcu_read_lock();
1141
1142 for_each_netdev_rcu(net, dev) {
1143 struct inet6_dev *idev;
1144
1145 /* Candidate Source Address (section 4)
1146 * - multicast and link-local destination address,
1147 * the set of candidate source address MUST only
1148 * include addresses assigned to interfaces
1149 * belonging to the same link as the outgoing
1150 * interface.
1151 * (- For site-local destination addresses, the
1152 * set of candidate source addresses MUST only
1153 * include addresses assigned to interfaces
1154 * belonging to the same site as the outgoing
1155 * interface.)
1156 */
1157 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1158 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1159 dst.ifindex && dev->ifindex != dst.ifindex)
1160 continue;
1161
1162 idev = __in6_dev_get(dev);
1163 if (!idev)
1164 continue;
1165
1166 read_lock_bh(&idev->lock);
1167 for (score->ifa = idev->addr_list; score->ifa; score->ifa = score->ifa->if_next) {
1168 int i;
1169
1170 /*
1171 * - Tentative Address (RFC2462 section 5.4)
1172 * - A tentative address is not considered
1173 * "assigned to an interface" in the traditional
1174 * sense, unless it is also flagged as optimistic.
1175 * - Candidate Source Address (section 4)
1176 * - In any case, anycast addresses, multicast
1177 * addresses, and the unspecified address MUST
1178 * NOT be included in a candidate set.
1179 */
1180 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1181 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1182 continue;
1183
1184 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1185
1186 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1187 score->addr_type & IPV6_ADDR_MULTICAST)) {
1188 LIMIT_NETDEBUG(KERN_DEBUG
1189 "ADDRCONF: unspecified / multicast address "
1190 "assigned as unicast address on %s",
1191 dev->name);
1192 continue;
1193 }
1194
1195 score->rule = -1;
1196 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1197
1198 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1199 int minihiscore, miniscore;
1200
1201 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1202 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1203
1204 if (minihiscore > miniscore) {
1205 if (i == IPV6_SADDR_RULE_SCOPE &&
1206 score->scopedist > 0) {
1207 /*
1208 * special case:
1209 * each remaining entry
1210 * has too small (not enough)
1211 * scope, because ifa entries
1212 * are sorted by their scope
1213 * values.
1214 */
1215 goto try_nextdev;
1216 }
1217 break;
1218 } else if (minihiscore < miniscore) {
1219 if (hiscore->ifa)
1220 in6_ifa_put(hiscore->ifa);
1221
1222 in6_ifa_hold(score->ifa);
1223
1224 swap(hiscore, score);
1225
1226 /* restore our iterator */
1227 score->ifa = hiscore->ifa;
1228
1229 break;
1230 }
1231 }
1232 }
1233 try_nextdev:
1234 read_unlock_bh(&idev->lock);
1235 }
1236 rcu_read_unlock();
1237
1238 if (!hiscore->ifa)
1239 return -EADDRNOTAVAIL;
1240
1241 ipv6_addr_copy(saddr, &hiscore->ifa->addr);
1242 in6_ifa_put(hiscore->ifa);
1243 return 0;
1244 }
1245
1246 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1247
1248 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1249 unsigned char banned_flags)
1250 {
1251 struct inet6_dev *idev;
1252 int err = -EADDRNOTAVAIL;
1253
1254 rcu_read_lock();
1255 if ((idev = __in6_dev_get(dev)) != NULL) {
1256 struct inet6_ifaddr *ifp;
1257
1258 read_lock_bh(&idev->lock);
1259 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1260 if (ifp->scope == IFA_LINK && !(ifp->flags & banned_flags)) {
1261 ipv6_addr_copy(addr, &ifp->addr);
1262 err = 0;
1263 break;
1264 }
1265 }
1266 read_unlock_bh(&idev->lock);
1267 }
1268 rcu_read_unlock();
1269 return err;
1270 }
1271
1272 static int ipv6_count_addresses(struct inet6_dev *idev)
1273 {
1274 int cnt = 0;
1275 struct inet6_ifaddr *ifp;
1276
1277 read_lock_bh(&idev->lock);
1278 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1279 cnt++;
1280 read_unlock_bh(&idev->lock);
1281 return cnt;
1282 }
1283
1284 int ipv6_chk_addr(struct net *net, struct in6_addr *addr,
1285 struct net_device *dev, int strict)
1286 {
1287 struct inet6_ifaddr * ifp;
1288 u8 hash = ipv6_addr_hash(addr);
1289
1290 read_lock_bh(&addrconf_hash_lock);
1291 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1292 if (!net_eq(dev_net(ifp->idev->dev), net))
1293 continue;
1294 if (ipv6_addr_equal(&ifp->addr, addr) &&
1295 !(ifp->flags&IFA_F_TENTATIVE)) {
1296 if (dev == NULL || ifp->idev->dev == dev ||
1297 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1298 break;
1299 }
1300 }
1301 read_unlock_bh(&addrconf_hash_lock);
1302 return ifp != NULL;
1303 }
1304 EXPORT_SYMBOL(ipv6_chk_addr);
1305
1306 static
1307 int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1308 struct net_device *dev)
1309 {
1310 struct inet6_ifaddr * ifp;
1311 u8 hash = ipv6_addr_hash(addr);
1312
1313 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1314 if (!net_eq(dev_net(ifp->idev->dev), net))
1315 continue;
1316 if (ipv6_addr_equal(&ifp->addr, addr)) {
1317 if (dev == NULL || ifp->idev->dev == dev)
1318 break;
1319 }
1320 }
1321 return ifp != NULL;
1322 }
1323
1324 int ipv6_chk_prefix(struct in6_addr *addr, struct net_device *dev)
1325 {
1326 struct inet6_dev *idev;
1327 struct inet6_ifaddr *ifa;
1328 int onlink;
1329
1330 onlink = 0;
1331 rcu_read_lock();
1332 idev = __in6_dev_get(dev);
1333 if (idev) {
1334 read_lock_bh(&idev->lock);
1335 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
1336 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1337 ifa->prefix_len);
1338 if (onlink)
1339 break;
1340 }
1341 read_unlock_bh(&idev->lock);
1342 }
1343 rcu_read_unlock();
1344 return onlink;
1345 }
1346
1347 EXPORT_SYMBOL(ipv6_chk_prefix);
1348
1349 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1350 struct net_device *dev, int strict)
1351 {
1352 struct inet6_ifaddr * ifp;
1353 u8 hash = ipv6_addr_hash(addr);
1354
1355 read_lock_bh(&addrconf_hash_lock);
1356 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1357 if (!net_eq(dev_net(ifp->idev->dev), net))
1358 continue;
1359 if (ipv6_addr_equal(&ifp->addr, addr)) {
1360 if (dev == NULL || ifp->idev->dev == dev ||
1361 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1362 in6_ifa_hold(ifp);
1363 break;
1364 }
1365 }
1366 }
1367 read_unlock_bh(&addrconf_hash_lock);
1368
1369 return ifp;
1370 }
1371
1372 /* Gets referenced address, destroys ifaddr */
1373
1374 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1375 {
1376 if (ifp->flags&IFA_F_PERMANENT) {
1377 spin_lock_bh(&ifp->lock);
1378 addrconf_del_timer(ifp);
1379 ifp->flags |= IFA_F_TENTATIVE;
1380 if (dad_failed)
1381 ifp->flags |= IFA_F_DADFAILED;
1382 spin_unlock_bh(&ifp->lock);
1383 if (dad_failed)
1384 ipv6_ifa_notify(0, ifp);
1385 in6_ifa_put(ifp);
1386 #ifdef CONFIG_IPV6_PRIVACY
1387 } else if (ifp->flags&IFA_F_TEMPORARY) {
1388 struct inet6_ifaddr *ifpub;
1389 spin_lock_bh(&ifp->lock);
1390 ifpub = ifp->ifpub;
1391 if (ifpub) {
1392 in6_ifa_hold(ifpub);
1393 spin_unlock_bh(&ifp->lock);
1394 ipv6_create_tempaddr(ifpub, ifp);
1395 in6_ifa_put(ifpub);
1396 } else {
1397 spin_unlock_bh(&ifp->lock);
1398 }
1399 ipv6_del_addr(ifp);
1400 #endif
1401 } else
1402 ipv6_del_addr(ifp);
1403 }
1404
1405 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1406 {
1407 struct inet6_dev *idev = ifp->idev;
1408
1409 if (net_ratelimit())
1410 printk(KERN_INFO "%s: IPv6 duplicate address %pI6c detected!\n",
1411 ifp->idev->dev->name, &ifp->addr);
1412
1413 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1414 struct in6_addr addr;
1415
1416 addr.s6_addr32[0] = htonl(0xfe800000);
1417 addr.s6_addr32[1] = 0;
1418
1419 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1420 ipv6_addr_equal(&ifp->addr, &addr)) {
1421 /* DAD failed for link-local based on MAC address */
1422 idev->cnf.disable_ipv6 = 1;
1423
1424 printk(KERN_INFO "%s: IPv6 being disabled!\n",
1425 ifp->idev->dev->name);
1426 }
1427 }
1428
1429 addrconf_dad_stop(ifp, 1);
1430 }
1431
1432 /* Join to solicited addr multicast group. */
1433
1434 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1435 {
1436 struct in6_addr maddr;
1437
1438 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1439 return;
1440
1441 addrconf_addr_solict_mult(addr, &maddr);
1442 ipv6_dev_mc_inc(dev, &maddr);
1443 }
1444
1445 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1446 {
1447 struct in6_addr maddr;
1448
1449 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1450 return;
1451
1452 addrconf_addr_solict_mult(addr, &maddr);
1453 __ipv6_dev_mc_dec(idev, &maddr);
1454 }
1455
1456 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1457 {
1458 struct in6_addr addr;
1459 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1460 if (ipv6_addr_any(&addr))
1461 return;
1462 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1463 }
1464
1465 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1466 {
1467 struct in6_addr addr;
1468 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1469 if (ipv6_addr_any(&addr))
1470 return;
1471 __ipv6_dev_ac_dec(ifp->idev, &addr);
1472 }
1473
1474 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1475 {
1476 if (dev->addr_len != ETH_ALEN)
1477 return -1;
1478 memcpy(eui, dev->dev_addr, 3);
1479 memcpy(eui + 5, dev->dev_addr + 3, 3);
1480
1481 /*
1482 * The zSeries OSA network cards can be shared among various
1483 * OS instances, but the OSA cards have only one MAC address.
1484 * This leads to duplicate address conflicts in conjunction
1485 * with IPv6 if more than one instance uses the same card.
1486 *
1487 * The driver for these cards can deliver a unique 16-bit
1488 * identifier for each instance sharing the same card. It is
1489 * placed instead of 0xFFFE in the interface identifier. The
1490 * "u" bit of the interface identifier is not inverted in this
1491 * case. Hence the resulting interface identifier has local
1492 * scope according to RFC2373.
1493 */
1494 if (dev->dev_id) {
1495 eui[3] = (dev->dev_id >> 8) & 0xFF;
1496 eui[4] = dev->dev_id & 0xFF;
1497 } else {
1498 eui[3] = 0xFF;
1499 eui[4] = 0xFE;
1500 eui[0] ^= 2;
1501 }
1502 return 0;
1503 }
1504
1505 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1506 {
1507 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1508 if (dev->addr_len != ARCNET_ALEN)
1509 return -1;
1510 memset(eui, 0, 7);
1511 eui[7] = *(u8*)dev->dev_addr;
1512 return 0;
1513 }
1514
1515 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1516 {
1517 if (dev->addr_len != INFINIBAND_ALEN)
1518 return -1;
1519 memcpy(eui, dev->dev_addr + 12, 8);
1520 eui[0] |= 2;
1521 return 0;
1522 }
1523
1524 int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1525 {
1526 if (addr == 0)
1527 return -1;
1528 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1529 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1530 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1531 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1532 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1533 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1534 eui[1] = 0;
1535 eui[2] = 0x5E;
1536 eui[3] = 0xFE;
1537 memcpy(eui + 4, &addr, 4);
1538 return 0;
1539 }
1540 EXPORT_SYMBOL(__ipv6_isatap_ifid);
1541
1542 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1543 {
1544 if (dev->priv_flags & IFF_ISATAP)
1545 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1546 return -1;
1547 }
1548
1549 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1550 {
1551 switch (dev->type) {
1552 case ARPHRD_ETHER:
1553 case ARPHRD_FDDI:
1554 case ARPHRD_IEEE802_TR:
1555 return addrconf_ifid_eui48(eui, dev);
1556 case ARPHRD_ARCNET:
1557 return addrconf_ifid_arcnet(eui, dev);
1558 case ARPHRD_INFINIBAND:
1559 return addrconf_ifid_infiniband(eui, dev);
1560 case ARPHRD_SIT:
1561 return addrconf_ifid_sit(eui, dev);
1562 }
1563 return -1;
1564 }
1565
1566 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1567 {
1568 int err = -1;
1569 struct inet6_ifaddr *ifp;
1570
1571 read_lock_bh(&idev->lock);
1572 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1573 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1574 memcpy(eui, ifp->addr.s6_addr+8, 8);
1575 err = 0;
1576 break;
1577 }
1578 }
1579 read_unlock_bh(&idev->lock);
1580 return err;
1581 }
1582
1583 #ifdef CONFIG_IPV6_PRIVACY
1584 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1585 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1586 {
1587 regen:
1588 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1589 idev->rndid[0] &= ~0x02;
1590
1591 /*
1592 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1593 * check if generated address is not inappropriate
1594 *
1595 * - Reserved subnet anycast (RFC 2526)
1596 * 11111101 11....11 1xxxxxxx
1597 * - ISATAP (RFC4214) 6.1
1598 * 00-00-5E-FE-xx-xx-xx-xx
1599 * - value 0
1600 * - XXX: already assigned to an address on the device
1601 */
1602 if (idev->rndid[0] == 0xfd &&
1603 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1604 (idev->rndid[7]&0x80))
1605 goto regen;
1606 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1607 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1608 goto regen;
1609 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1610 goto regen;
1611 }
1612
1613 return 0;
1614 }
1615
1616 static void ipv6_regen_rndid(unsigned long data)
1617 {
1618 struct inet6_dev *idev = (struct inet6_dev *) data;
1619 unsigned long expires;
1620
1621 rcu_read_lock_bh();
1622 write_lock_bh(&idev->lock);
1623
1624 if (idev->dead)
1625 goto out;
1626
1627 if (__ipv6_regen_rndid(idev) < 0)
1628 goto out;
1629
1630 expires = jiffies +
1631 idev->cnf.temp_prefered_lft * HZ -
1632 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1633 if (time_before(expires, jiffies)) {
1634 printk(KERN_WARNING
1635 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1636 idev->dev->name);
1637 goto out;
1638 }
1639
1640 if (!mod_timer(&idev->regen_timer, expires))
1641 in6_dev_hold(idev);
1642
1643 out:
1644 write_unlock_bh(&idev->lock);
1645 rcu_read_unlock_bh();
1646 in6_dev_put(idev);
1647 }
1648
1649 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1650 int ret = 0;
1651
1652 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1653 ret = __ipv6_regen_rndid(idev);
1654 return ret;
1655 }
1656 #endif
1657
1658 /*
1659 * Add prefix route.
1660 */
1661
1662 static void
1663 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1664 unsigned long expires, u32 flags)
1665 {
1666 struct fib6_config cfg = {
1667 .fc_table = RT6_TABLE_PREFIX,
1668 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1669 .fc_ifindex = dev->ifindex,
1670 .fc_expires = expires,
1671 .fc_dst_len = plen,
1672 .fc_flags = RTF_UP | flags,
1673 .fc_nlinfo.nl_net = dev_net(dev),
1674 .fc_protocol = RTPROT_KERNEL,
1675 };
1676
1677 ipv6_addr_copy(&cfg.fc_dst, pfx);
1678
1679 /* Prevent useless cloning on PtP SIT.
1680 This thing is done here expecting that the whole
1681 class of non-broadcast devices need not cloning.
1682 */
1683 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1684 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1685 cfg.fc_flags |= RTF_NONEXTHOP;
1686 #endif
1687
1688 ip6_route_add(&cfg);
1689 }
1690
1691 /* Create "default" multicast route to the interface */
1692
1693 static void addrconf_add_mroute(struct net_device *dev)
1694 {
1695 struct fib6_config cfg = {
1696 .fc_table = RT6_TABLE_LOCAL,
1697 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1698 .fc_ifindex = dev->ifindex,
1699 .fc_dst_len = 8,
1700 .fc_flags = RTF_UP,
1701 .fc_nlinfo.nl_net = dev_net(dev),
1702 };
1703
1704 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1705
1706 ip6_route_add(&cfg);
1707 }
1708
1709 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1710 static void sit_route_add(struct net_device *dev)
1711 {
1712 struct fib6_config cfg = {
1713 .fc_table = RT6_TABLE_MAIN,
1714 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1715 .fc_ifindex = dev->ifindex,
1716 .fc_dst_len = 96,
1717 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1718 .fc_nlinfo.nl_net = dev_net(dev),
1719 };
1720
1721 /* prefix length - 96 bits "::d.d.d.d" */
1722 ip6_route_add(&cfg);
1723 }
1724 #endif
1725
1726 static void addrconf_add_lroute(struct net_device *dev)
1727 {
1728 struct in6_addr addr;
1729
1730 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1731 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1732 }
1733
1734 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1735 {
1736 struct inet6_dev *idev;
1737
1738 ASSERT_RTNL();
1739
1740 if ((idev = ipv6_find_idev(dev)) == NULL)
1741 return NULL;
1742
1743 /* Add default multicast route */
1744 addrconf_add_mroute(dev);
1745
1746 /* Add link local route */
1747 addrconf_add_lroute(dev);
1748 return idev;
1749 }
1750
1751 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1752 {
1753 struct prefix_info *pinfo;
1754 __u32 valid_lft;
1755 __u32 prefered_lft;
1756 int addr_type;
1757 struct inet6_dev *in6_dev;
1758 struct net *net = dev_net(dev);
1759
1760 pinfo = (struct prefix_info *) opt;
1761
1762 if (len < sizeof(struct prefix_info)) {
1763 ADBG(("addrconf: prefix option too short\n"));
1764 return;
1765 }
1766
1767 /*
1768 * Validation checks ([ADDRCONF], page 19)
1769 */
1770
1771 addr_type = ipv6_addr_type(&pinfo->prefix);
1772
1773 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1774 return;
1775
1776 valid_lft = ntohl(pinfo->valid);
1777 prefered_lft = ntohl(pinfo->prefered);
1778
1779 if (prefered_lft > valid_lft) {
1780 if (net_ratelimit())
1781 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1782 return;
1783 }
1784
1785 in6_dev = in6_dev_get(dev);
1786
1787 if (in6_dev == NULL) {
1788 if (net_ratelimit())
1789 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1790 return;
1791 }
1792
1793 /*
1794 * Two things going on here:
1795 * 1) Add routes for on-link prefixes
1796 * 2) Configure prefixes with the auto flag set
1797 */
1798
1799 if (pinfo->onlink) {
1800 struct rt6_info *rt;
1801 unsigned long rt_expires;
1802
1803 /* Avoid arithmetic overflow. Really, we could
1804 * save rt_expires in seconds, likely valid_lft,
1805 * but it would require division in fib gc, that it
1806 * not good.
1807 */
1808 if (HZ > USER_HZ)
1809 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
1810 else
1811 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
1812
1813 if (addrconf_finite_timeout(rt_expires))
1814 rt_expires *= HZ;
1815
1816 rt = rt6_lookup(net, &pinfo->prefix, NULL,
1817 dev->ifindex, 1);
1818
1819 if (rt && addrconf_is_prefix_route(rt)) {
1820 /* Autoconf prefix route */
1821 if (valid_lft == 0) {
1822 ip6_del_rt(rt);
1823 rt = NULL;
1824 } else if (addrconf_finite_timeout(rt_expires)) {
1825 /* not infinity */
1826 rt->rt6i_expires = jiffies + rt_expires;
1827 rt->rt6i_flags |= RTF_EXPIRES;
1828 } else {
1829 rt->rt6i_flags &= ~RTF_EXPIRES;
1830 rt->rt6i_expires = 0;
1831 }
1832 } else if (valid_lft) {
1833 clock_t expires = 0;
1834 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
1835 if (addrconf_finite_timeout(rt_expires)) {
1836 /* not infinity */
1837 flags |= RTF_EXPIRES;
1838 expires = jiffies_to_clock_t(rt_expires);
1839 }
1840 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1841 dev, expires, flags);
1842 }
1843 if (rt)
1844 dst_release(&rt->u.dst);
1845 }
1846
1847 /* Try to figure out our local address for this prefix */
1848
1849 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1850 struct inet6_ifaddr * ifp;
1851 struct in6_addr addr;
1852 int create = 0, update_lft = 0;
1853
1854 if (pinfo->prefix_len == 64) {
1855 memcpy(&addr, &pinfo->prefix, 8);
1856 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1857 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1858 in6_dev_put(in6_dev);
1859 return;
1860 }
1861 goto ok;
1862 }
1863 if (net_ratelimit())
1864 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1865 pinfo->prefix_len);
1866 in6_dev_put(in6_dev);
1867 return;
1868
1869 ok:
1870
1871 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1872
1873 if (ifp == NULL && valid_lft) {
1874 int max_addresses = in6_dev->cnf.max_addresses;
1875 u32 addr_flags = 0;
1876
1877 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1878 if (in6_dev->cnf.optimistic_dad &&
1879 !net->ipv6.devconf_all->forwarding)
1880 addr_flags = IFA_F_OPTIMISTIC;
1881 #endif
1882
1883 /* Do not allow to create too much of autoconfigured
1884 * addresses; this would be too easy way to crash kernel.
1885 */
1886 if (!max_addresses ||
1887 ipv6_count_addresses(in6_dev) < max_addresses)
1888 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1889 addr_type&IPV6_ADDR_SCOPE_MASK,
1890 addr_flags);
1891
1892 if (!ifp || IS_ERR(ifp)) {
1893 in6_dev_put(in6_dev);
1894 return;
1895 }
1896
1897 update_lft = create = 1;
1898 ifp->cstamp = jiffies;
1899 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1900 }
1901
1902 if (ifp) {
1903 int flags;
1904 unsigned long now;
1905 #ifdef CONFIG_IPV6_PRIVACY
1906 struct inet6_ifaddr *ift;
1907 #endif
1908 u32 stored_lft;
1909
1910 /* update lifetime (RFC2462 5.5.3 e) */
1911 spin_lock(&ifp->lock);
1912 now = jiffies;
1913 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1914 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1915 else
1916 stored_lft = 0;
1917 if (!update_lft && stored_lft) {
1918 if (valid_lft > MIN_VALID_LIFETIME ||
1919 valid_lft > stored_lft)
1920 update_lft = 1;
1921 else if (stored_lft <= MIN_VALID_LIFETIME) {
1922 /* valid_lft <= stored_lft is always true */
1923 /*
1924 * RFC 4862 Section 5.5.3e:
1925 * "Note that the preferred lifetime of
1926 * the corresponding address is always
1927 * reset to the Preferred Lifetime in
1928 * the received Prefix Information
1929 * option, regardless of whether the
1930 * valid lifetime is also reset or
1931 * ignored."
1932 *
1933 * So if the preferred lifetime in
1934 * this advertisement is different
1935 * than what we have stored, but the
1936 * valid lifetime is invalid, just
1937 * reset prefered_lft.
1938 *
1939 * We must set the valid lifetime
1940 * to the stored lifetime since we'll
1941 * be updating the timestamp below,
1942 * else we'll set it back to the
1943 * minumum.
1944 */
1945 if (prefered_lft != ifp->prefered_lft) {
1946 valid_lft = stored_lft;
1947 update_lft = 1;
1948 }
1949 } else {
1950 valid_lft = MIN_VALID_LIFETIME;
1951 if (valid_lft < prefered_lft)
1952 prefered_lft = valid_lft;
1953 update_lft = 1;
1954 }
1955 }
1956
1957 if (update_lft) {
1958 ifp->valid_lft = valid_lft;
1959 ifp->prefered_lft = prefered_lft;
1960 ifp->tstamp = now;
1961 flags = ifp->flags;
1962 ifp->flags &= ~IFA_F_DEPRECATED;
1963 spin_unlock(&ifp->lock);
1964
1965 if (!(flags&IFA_F_TENTATIVE))
1966 ipv6_ifa_notify(0, ifp);
1967 } else
1968 spin_unlock(&ifp->lock);
1969
1970 #ifdef CONFIG_IPV6_PRIVACY
1971 read_lock_bh(&in6_dev->lock);
1972 /* update all temporary addresses in the list */
1973 for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1974 /*
1975 * When adjusting the lifetimes of an existing
1976 * temporary address, only lower the lifetimes.
1977 * Implementations must not increase the
1978 * lifetimes of an existing temporary address
1979 * when processing a Prefix Information Option.
1980 */
1981 if (ifp != ift->ifpub)
1982 continue;
1983
1984 spin_lock(&ift->lock);
1985 flags = ift->flags;
1986 if (ift->valid_lft > valid_lft &&
1987 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1988 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1989 if (ift->prefered_lft > prefered_lft &&
1990 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1991 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1992 spin_unlock(&ift->lock);
1993 if (!(flags&IFA_F_TENTATIVE))
1994 ipv6_ifa_notify(0, ift);
1995 }
1996
1997 if (create && in6_dev->cnf.use_tempaddr > 0) {
1998 /*
1999 * When a new public address is created as described in [ADDRCONF],
2000 * also create a new temporary address.
2001 */
2002 read_unlock_bh(&in6_dev->lock);
2003 ipv6_create_tempaddr(ifp, NULL);
2004 } else {
2005 read_unlock_bh(&in6_dev->lock);
2006 }
2007 #endif
2008 in6_ifa_put(ifp);
2009 addrconf_verify(0);
2010 }
2011 }
2012 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2013 in6_dev_put(in6_dev);
2014 }
2015
2016 /*
2017 * Set destination address.
2018 * Special case for SIT interfaces where we create a new "virtual"
2019 * device.
2020 */
2021 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2022 {
2023 struct in6_ifreq ireq;
2024 struct net_device *dev;
2025 int err = -EINVAL;
2026
2027 rtnl_lock();
2028
2029 err = -EFAULT;
2030 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2031 goto err_exit;
2032
2033 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2034
2035 err = -ENODEV;
2036 if (dev == NULL)
2037 goto err_exit;
2038
2039 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2040 if (dev->type == ARPHRD_SIT) {
2041 const struct net_device_ops *ops = dev->netdev_ops;
2042 struct ifreq ifr;
2043 struct ip_tunnel_parm p;
2044
2045 err = -EADDRNOTAVAIL;
2046 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2047 goto err_exit;
2048
2049 memset(&p, 0, sizeof(p));
2050 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2051 p.iph.saddr = 0;
2052 p.iph.version = 4;
2053 p.iph.ihl = 5;
2054 p.iph.protocol = IPPROTO_IPV6;
2055 p.iph.ttl = 64;
2056 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2057
2058 if (ops->ndo_do_ioctl) {
2059 mm_segment_t oldfs = get_fs();
2060
2061 set_fs(KERNEL_DS);
2062 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2063 set_fs(oldfs);
2064 } else
2065 err = -EOPNOTSUPP;
2066
2067 if (err == 0) {
2068 err = -ENOBUFS;
2069 dev = __dev_get_by_name(net, p.name);
2070 if (!dev)
2071 goto err_exit;
2072 err = dev_open(dev);
2073 }
2074 }
2075 #endif
2076
2077 err_exit:
2078 rtnl_unlock();
2079 return err;
2080 }
2081
2082 /*
2083 * Manual configuration of address on an interface
2084 */
2085 static int inet6_addr_add(struct net *net, int ifindex, struct in6_addr *pfx,
2086 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
2087 __u32 valid_lft)
2088 {
2089 struct inet6_ifaddr *ifp;
2090 struct inet6_dev *idev;
2091 struct net_device *dev;
2092 int scope;
2093 u32 flags;
2094 clock_t expires;
2095 unsigned long timeout;
2096
2097 ASSERT_RTNL();
2098
2099 if (plen > 128)
2100 return -EINVAL;
2101
2102 /* check the lifetime */
2103 if (!valid_lft || prefered_lft > valid_lft)
2104 return -EINVAL;
2105
2106 dev = __dev_get_by_index(net, ifindex);
2107 if (!dev)
2108 return -ENODEV;
2109
2110 if ((idev = addrconf_add_dev(dev)) == NULL)
2111 return -ENOBUFS;
2112
2113 scope = ipv6_addr_scope(pfx);
2114
2115 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2116 if (addrconf_finite_timeout(timeout)) {
2117 expires = jiffies_to_clock_t(timeout * HZ);
2118 valid_lft = timeout;
2119 flags = RTF_EXPIRES;
2120 } else {
2121 expires = 0;
2122 flags = 0;
2123 ifa_flags |= IFA_F_PERMANENT;
2124 }
2125
2126 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2127 if (addrconf_finite_timeout(timeout)) {
2128 if (timeout == 0)
2129 ifa_flags |= IFA_F_DEPRECATED;
2130 prefered_lft = timeout;
2131 }
2132
2133 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2134
2135 if (!IS_ERR(ifp)) {
2136 spin_lock_bh(&ifp->lock);
2137 ifp->valid_lft = valid_lft;
2138 ifp->prefered_lft = prefered_lft;
2139 ifp->tstamp = jiffies;
2140 spin_unlock_bh(&ifp->lock);
2141
2142 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2143 expires, flags);
2144 /*
2145 * Note that section 3.1 of RFC 4429 indicates
2146 * that the Optimistic flag should not be set for
2147 * manually configured addresses
2148 */
2149 addrconf_dad_start(ifp, 0);
2150 in6_ifa_put(ifp);
2151 addrconf_verify(0);
2152 return 0;
2153 }
2154
2155 return PTR_ERR(ifp);
2156 }
2157
2158 static int inet6_addr_del(struct net *net, int ifindex, struct in6_addr *pfx,
2159 unsigned int plen)
2160 {
2161 struct inet6_ifaddr *ifp;
2162 struct inet6_dev *idev;
2163 struct net_device *dev;
2164
2165 if (plen > 128)
2166 return -EINVAL;
2167
2168 dev = __dev_get_by_index(net, ifindex);
2169 if (!dev)
2170 return -ENODEV;
2171
2172 if ((idev = __in6_dev_get(dev)) == NULL)
2173 return -ENXIO;
2174
2175 read_lock_bh(&idev->lock);
2176 for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
2177 if (ifp->prefix_len == plen &&
2178 ipv6_addr_equal(pfx, &ifp->addr)) {
2179 in6_ifa_hold(ifp);
2180 read_unlock_bh(&idev->lock);
2181
2182 ipv6_del_addr(ifp);
2183
2184 /* If the last address is deleted administratively,
2185 disable IPv6 on this interface.
2186 */
2187 if (idev->addr_list == NULL)
2188 addrconf_ifdown(idev->dev, 1);
2189 return 0;
2190 }
2191 }
2192 read_unlock_bh(&idev->lock);
2193 return -EADDRNOTAVAIL;
2194 }
2195
2196
2197 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2198 {
2199 struct in6_ifreq ireq;
2200 int err;
2201
2202 if (!capable(CAP_NET_ADMIN))
2203 return -EPERM;
2204
2205 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2206 return -EFAULT;
2207
2208 rtnl_lock();
2209 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2210 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2211 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2212 rtnl_unlock();
2213 return err;
2214 }
2215
2216 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2217 {
2218 struct in6_ifreq ireq;
2219 int err;
2220
2221 if (!capable(CAP_NET_ADMIN))
2222 return -EPERM;
2223
2224 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2225 return -EFAULT;
2226
2227 rtnl_lock();
2228 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2229 ireq.ifr6_prefixlen);
2230 rtnl_unlock();
2231 return err;
2232 }
2233
2234 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2235 int plen, int scope)
2236 {
2237 struct inet6_ifaddr *ifp;
2238
2239 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT);
2240 if (!IS_ERR(ifp)) {
2241 spin_lock_bh(&ifp->lock);
2242 ifp->flags &= ~IFA_F_TENTATIVE;
2243 spin_unlock_bh(&ifp->lock);
2244 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2245 in6_ifa_put(ifp);
2246 }
2247 }
2248
2249 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2250 static void sit_add_v4_addrs(struct inet6_dev *idev)
2251 {
2252 struct in6_addr addr;
2253 struct net_device *dev;
2254 struct net *net = dev_net(idev->dev);
2255 int scope;
2256
2257 ASSERT_RTNL();
2258
2259 memset(&addr, 0, sizeof(struct in6_addr));
2260 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2261
2262 if (idev->dev->flags&IFF_POINTOPOINT) {
2263 addr.s6_addr32[0] = htonl(0xfe800000);
2264 scope = IFA_LINK;
2265 } else {
2266 scope = IPV6_ADDR_COMPATv4;
2267 }
2268
2269 if (addr.s6_addr32[3]) {
2270 add_addr(idev, &addr, 128, scope);
2271 return;
2272 }
2273
2274 for_each_netdev(net, dev) {
2275 struct in_device * in_dev = __in_dev_get_rtnl(dev);
2276 if (in_dev && (dev->flags & IFF_UP)) {
2277 struct in_ifaddr * ifa;
2278
2279 int flag = scope;
2280
2281 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2282 int plen;
2283
2284 addr.s6_addr32[3] = ifa->ifa_local;
2285
2286 if (ifa->ifa_scope == RT_SCOPE_LINK)
2287 continue;
2288 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2289 if (idev->dev->flags&IFF_POINTOPOINT)
2290 continue;
2291 flag |= IFA_HOST;
2292 }
2293 if (idev->dev->flags&IFF_POINTOPOINT)
2294 plen = 64;
2295 else
2296 plen = 96;
2297
2298 add_addr(idev, &addr, plen, flag);
2299 }
2300 }
2301 }
2302 }
2303 #endif
2304
2305 static void init_loopback(struct net_device *dev)
2306 {
2307 struct inet6_dev *idev;
2308
2309 /* ::1 */
2310
2311 ASSERT_RTNL();
2312
2313 if ((idev = ipv6_find_idev(dev)) == NULL) {
2314 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2315 return;
2316 }
2317
2318 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2319 }
2320
2321 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2322 {
2323 struct inet6_ifaddr * ifp;
2324 u32 addr_flags = IFA_F_PERMANENT;
2325
2326 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2327 if (idev->cnf.optimistic_dad &&
2328 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2329 addr_flags |= IFA_F_OPTIMISTIC;
2330 #endif
2331
2332
2333 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2334 if (!IS_ERR(ifp)) {
2335 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2336 addrconf_dad_start(ifp, 0);
2337 in6_ifa_put(ifp);
2338 }
2339 }
2340
2341 static void addrconf_dev_config(struct net_device *dev)
2342 {
2343 struct in6_addr addr;
2344 struct inet6_dev * idev;
2345
2346 ASSERT_RTNL();
2347
2348 if ((dev->type != ARPHRD_ETHER) &&
2349 (dev->type != ARPHRD_FDDI) &&
2350 (dev->type != ARPHRD_IEEE802_TR) &&
2351 (dev->type != ARPHRD_ARCNET) &&
2352 (dev->type != ARPHRD_INFINIBAND)) {
2353 /* Alas, we support only Ethernet autoconfiguration. */
2354 return;
2355 }
2356
2357 idev = addrconf_add_dev(dev);
2358 if (idev == NULL)
2359 return;
2360
2361 memset(&addr, 0, sizeof(struct in6_addr));
2362 addr.s6_addr32[0] = htonl(0xFE800000);
2363
2364 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2365 addrconf_add_linklocal(idev, &addr);
2366 }
2367
2368 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2369 static void addrconf_sit_config(struct net_device *dev)
2370 {
2371 struct inet6_dev *idev;
2372
2373 ASSERT_RTNL();
2374
2375 /*
2376 * Configure the tunnel with one of our IPv4
2377 * addresses... we should configure all of
2378 * our v4 addrs in the tunnel
2379 */
2380
2381 if ((idev = ipv6_find_idev(dev)) == NULL) {
2382 printk(KERN_DEBUG "init sit: add_dev failed\n");
2383 return;
2384 }
2385
2386 if (dev->priv_flags & IFF_ISATAP) {
2387 struct in6_addr addr;
2388
2389 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2390 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2391 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2392 addrconf_add_linklocal(idev, &addr);
2393 return;
2394 }
2395
2396 sit_add_v4_addrs(idev);
2397
2398 if (dev->flags&IFF_POINTOPOINT) {
2399 addrconf_add_mroute(dev);
2400 addrconf_add_lroute(dev);
2401 } else
2402 sit_route_add(dev);
2403 }
2404 #endif
2405
2406 static inline int
2407 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2408 {
2409 struct in6_addr lladdr;
2410
2411 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2412 addrconf_add_linklocal(idev, &lladdr);
2413 return 0;
2414 }
2415 return -1;
2416 }
2417
2418 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2419 {
2420 struct net_device *link_dev;
2421 struct net *net = dev_net(idev->dev);
2422
2423 /* first try to inherit the link-local address from the link device */
2424 if (idev->dev->iflink &&
2425 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
2426 if (!ipv6_inherit_linklocal(idev, link_dev))
2427 return;
2428 }
2429 /* then try to inherit it from any device */
2430 for_each_netdev(net, link_dev) {
2431 if (!ipv6_inherit_linklocal(idev, link_dev))
2432 return;
2433 }
2434 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2435 }
2436
2437 /*
2438 * Autoconfigure tunnel with a link-local address so routing protocols,
2439 * DHCPv6, MLD etc. can be run over the virtual link
2440 */
2441
2442 static void addrconf_ip6_tnl_config(struct net_device *dev)
2443 {
2444 struct inet6_dev *idev;
2445
2446 ASSERT_RTNL();
2447
2448 if ((idev = addrconf_add_dev(dev)) == NULL) {
2449 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2450 return;
2451 }
2452 ip6_tnl_add_linklocal(idev);
2453 }
2454
2455 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2456 void * data)
2457 {
2458 struct net_device *dev = (struct net_device *) data;
2459 struct inet6_dev *idev = __in6_dev_get(dev);
2460 int run_pending = 0;
2461 int err;
2462
2463 switch(event) {
2464 case NETDEV_REGISTER:
2465 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2466 idev = ipv6_add_dev(dev);
2467 if (!idev)
2468 return notifier_from_errno(-ENOMEM);
2469 }
2470 break;
2471 case NETDEV_UP:
2472 case NETDEV_CHANGE:
2473 if (dev->flags & IFF_SLAVE)
2474 break;
2475
2476 if (event == NETDEV_UP) {
2477 if (!addrconf_qdisc_ok(dev)) {
2478 /* device is not ready yet. */
2479 printk(KERN_INFO
2480 "ADDRCONF(NETDEV_UP): %s: "
2481 "link is not ready\n",
2482 dev->name);
2483 break;
2484 }
2485
2486 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2487 idev = ipv6_add_dev(dev);
2488
2489 if (idev) {
2490 idev->if_flags |= IF_READY;
2491 run_pending = 1;
2492 }
2493 } else {
2494 if (!addrconf_qdisc_ok(dev)) {
2495 /* device is still not ready. */
2496 break;
2497 }
2498
2499 if (idev) {
2500 if (idev->if_flags & IF_READY) {
2501 /* device is already configured. */
2502 break;
2503 }
2504 idev->if_flags |= IF_READY;
2505 }
2506
2507 printk(KERN_INFO
2508 "ADDRCONF(NETDEV_CHANGE): %s: "
2509 "link becomes ready\n",
2510 dev->name);
2511
2512 run_pending = 1;
2513 }
2514
2515 switch(dev->type) {
2516 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2517 case ARPHRD_SIT:
2518 addrconf_sit_config(dev);
2519 break;
2520 #endif
2521 case ARPHRD_TUNNEL6:
2522 addrconf_ip6_tnl_config(dev);
2523 break;
2524 case ARPHRD_LOOPBACK:
2525 init_loopback(dev);
2526 break;
2527
2528 default:
2529 addrconf_dev_config(dev);
2530 break;
2531 }
2532 if (idev) {
2533 if (run_pending)
2534 addrconf_dad_run(idev);
2535
2536 /* If the MTU changed during the interface down, when the
2537 interface up, the changed MTU must be reflected in the
2538 idev as well as routers.
2539 */
2540 if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2541 rt6_mtu_change(dev, dev->mtu);
2542 idev->cnf.mtu6 = dev->mtu;
2543 }
2544 idev->tstamp = jiffies;
2545 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2546 /* If the changed mtu during down is lower than IPV6_MIN_MTU
2547 stop IPv6 on this interface.
2548 */
2549 if (dev->mtu < IPV6_MIN_MTU)
2550 addrconf_ifdown(dev, event != NETDEV_DOWN);
2551 }
2552 break;
2553
2554 case NETDEV_CHANGEMTU:
2555 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2556 rt6_mtu_change(dev, dev->mtu);
2557 idev->cnf.mtu6 = dev->mtu;
2558 break;
2559 }
2560
2561 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2562 idev = ipv6_add_dev(dev);
2563 if (idev)
2564 break;
2565 }
2566
2567 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2568
2569 case NETDEV_DOWN:
2570 case NETDEV_UNREGISTER:
2571 /*
2572 * Remove all addresses from this interface.
2573 */
2574 addrconf_ifdown(dev, event != NETDEV_DOWN);
2575 break;
2576
2577 case NETDEV_CHANGENAME:
2578 if (idev) {
2579 snmp6_unregister_dev(idev);
2580 addrconf_sysctl_unregister(idev);
2581 addrconf_sysctl_register(idev);
2582 err = snmp6_register_dev(idev);
2583 if (err)
2584 return notifier_from_errno(err);
2585 }
2586 break;
2587 case NETDEV_BONDING_OLDTYPE:
2588 case NETDEV_BONDING_NEWTYPE:
2589 addrconf_bonding_change(dev, event);
2590 break;
2591 }
2592
2593 return NOTIFY_OK;
2594 }
2595
2596 /*
2597 * addrconf module should be notified of a device going up
2598 */
2599 static struct notifier_block ipv6_dev_notf = {
2600 .notifier_call = addrconf_notify,
2601 .priority = 0
2602 };
2603
2604 static void addrconf_bonding_change(struct net_device *dev, unsigned long event)
2605 {
2606 struct inet6_dev *idev;
2607 ASSERT_RTNL();
2608
2609 idev = __in6_dev_get(dev);
2610
2611 if (event == NETDEV_BONDING_NEWTYPE)
2612 ipv6_mc_remap(idev);
2613 else if (event == NETDEV_BONDING_OLDTYPE)
2614 ipv6_mc_unmap(idev);
2615 }
2616
2617 static int addrconf_ifdown(struct net_device *dev, int how)
2618 {
2619 struct inet6_dev *idev;
2620 struct inet6_ifaddr *ifa, *keep_list, **bifa;
2621 struct net *net = dev_net(dev);
2622 int i;
2623
2624 ASSERT_RTNL();
2625
2626 rt6_ifdown(net, dev);
2627 neigh_ifdown(&nd_tbl, dev);
2628
2629 idev = __in6_dev_get(dev);
2630 if (idev == NULL)
2631 return -ENODEV;
2632
2633 /* Step 1: remove reference to ipv6 device from parent device.
2634 Do not dev_put!
2635 */
2636 if (how) {
2637 idev->dead = 1;
2638
2639 /* protected by rtnl_lock */
2640 rcu_assign_pointer(dev->ip6_ptr, NULL);
2641
2642 /* Step 1.5: remove snmp6 entry */
2643 snmp6_unregister_dev(idev);
2644
2645 }
2646
2647 /* Step 2: clear hash table */
2648 for (i=0; i<IN6_ADDR_HSIZE; i++) {
2649 bifa = &inet6_addr_lst[i];
2650
2651 write_lock_bh(&addrconf_hash_lock);
2652 while ((ifa = *bifa) != NULL) {
2653 if (ifa->idev == idev &&
2654 (how || !(ifa->flags&IFA_F_PERMANENT) ||
2655 ipv6_addr_type(&ifa->addr) & IPV6_ADDR_LINKLOCAL)) {
2656 *bifa = ifa->lst_next;
2657 ifa->lst_next = NULL;
2658 __in6_ifa_put(ifa);
2659 continue;
2660 }
2661 bifa = &ifa->lst_next;
2662 }
2663 write_unlock_bh(&addrconf_hash_lock);
2664 }
2665
2666 write_lock_bh(&idev->lock);
2667
2668 /* Step 3: clear flags for stateless addrconf */
2669 if (!how)
2670 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2671
2672 /* Step 4: clear address list */
2673 #ifdef CONFIG_IPV6_PRIVACY
2674 if (how && del_timer(&idev->regen_timer))
2675 in6_dev_put(idev);
2676
2677 /* clear tempaddr list */
2678 while ((ifa = idev->tempaddr_list) != NULL) {
2679 idev->tempaddr_list = ifa->tmp_next;
2680 ifa->tmp_next = NULL;
2681 ifa->dead = 1;
2682 write_unlock_bh(&idev->lock);
2683 spin_lock_bh(&ifa->lock);
2684
2685 if (ifa->ifpub) {
2686 in6_ifa_put(ifa->ifpub);
2687 ifa->ifpub = NULL;
2688 }
2689 spin_unlock_bh(&ifa->lock);
2690 in6_ifa_put(ifa);
2691 write_lock_bh(&idev->lock);
2692 }
2693 #endif
2694 keep_list = NULL;
2695 bifa = &keep_list;
2696 while ((ifa = idev->addr_list) != NULL) {
2697 idev->addr_list = ifa->if_next;
2698 ifa->if_next = NULL;
2699
2700 addrconf_del_timer(ifa);
2701
2702 /* If just doing link down, and address is permanent
2703 and not link-local, then retain it. */
2704 if (how == 0 &&
2705 (ifa->flags&IFA_F_PERMANENT) &&
2706 !(ipv6_addr_type(&ifa->addr) & IPV6_ADDR_LINKLOCAL)) {
2707
2708 /* Move to holding list */
2709 *bifa = ifa;
2710 bifa = &ifa->if_next;
2711
2712 /* If not doing DAD on this address, just keep it. */
2713 if ((dev->flags&(IFF_NOARP|IFF_LOOPBACK)) ||
2714 idev->cnf.accept_dad <= 0 ||
2715 (ifa->flags & IFA_F_NODAD))
2716 continue;
2717
2718 /* If it was tentative already, no need to notify */
2719 if (ifa->flags & IFA_F_TENTATIVE)
2720 continue;
2721
2722 /* Flag it for later restoration when link comes up */
2723 ifa->flags |= IFA_F_TENTATIVE;
2724 in6_ifa_hold(ifa);
2725 } else {
2726 ifa->dead = 1;
2727 }
2728 write_unlock_bh(&idev->lock);
2729
2730 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2731 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2732 in6_ifa_put(ifa);
2733
2734 write_lock_bh(&idev->lock);
2735 }
2736
2737 idev->addr_list = keep_list;
2738
2739 write_unlock_bh(&idev->lock);
2740
2741 /* Step 5: Discard multicast list */
2742
2743 if (how)
2744 ipv6_mc_destroy_dev(idev);
2745 else
2746 ipv6_mc_down(idev);
2747
2748 idev->tstamp = jiffies;
2749
2750 /* Shot the device (if unregistered) */
2751
2752 if (how) {
2753 addrconf_sysctl_unregister(idev);
2754 neigh_parms_release(&nd_tbl, idev->nd_parms);
2755 neigh_ifdown(&nd_tbl, dev);
2756 in6_dev_put(idev);
2757 }
2758 return 0;
2759 }
2760
2761 static void addrconf_rs_timer(unsigned long data)
2762 {
2763 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2764 struct inet6_dev *idev = ifp->idev;
2765
2766 read_lock(&idev->lock);
2767 if (idev->dead || !(idev->if_flags & IF_READY))
2768 goto out;
2769
2770 if (idev->cnf.forwarding)
2771 goto out;
2772
2773 /* Announcement received after solicitation was sent */
2774 if (idev->if_flags & IF_RA_RCVD)
2775 goto out;
2776
2777 spin_lock(&ifp->lock);
2778 if (ifp->probes++ < idev->cnf.rtr_solicits) {
2779 /* The wait after the last probe can be shorter */
2780 addrconf_mod_timer(ifp, AC_RS,
2781 (ifp->probes == idev->cnf.rtr_solicits) ?
2782 idev->cnf.rtr_solicit_delay :
2783 idev->cnf.rtr_solicit_interval);
2784 spin_unlock(&ifp->lock);
2785
2786 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2787 } else {
2788 spin_unlock(&ifp->lock);
2789 /*
2790 * Note: we do not support deprecated "all on-link"
2791 * assumption any longer.
2792 */
2793 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2794 idev->dev->name);
2795 }
2796
2797 out:
2798 read_unlock(&idev->lock);
2799 in6_ifa_put(ifp);
2800 }
2801
2802 /*
2803 * Duplicate Address Detection
2804 */
2805 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2806 {
2807 unsigned long rand_num;
2808 struct inet6_dev *idev = ifp->idev;
2809
2810 if (ifp->flags & IFA_F_OPTIMISTIC)
2811 rand_num = 0;
2812 else
2813 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2814
2815 ifp->probes = idev->cnf.dad_transmits;
2816 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2817 }
2818
2819 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2820 {
2821 struct inet6_dev *idev = ifp->idev;
2822 struct net_device *dev = idev->dev;
2823
2824 addrconf_join_solict(dev, &ifp->addr);
2825
2826 net_srandom(ifp->addr.s6_addr32[3]);
2827
2828 read_lock_bh(&idev->lock);
2829 if (ifp->dead)
2830 goto out;
2831
2832 spin_lock(&ifp->lock);
2833 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2834 idev->cnf.accept_dad < 1 ||
2835 !(ifp->flags&IFA_F_TENTATIVE) ||
2836 ifp->flags & IFA_F_NODAD) {
2837 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
2838 spin_unlock(&ifp->lock);
2839 read_unlock_bh(&idev->lock);
2840
2841 addrconf_dad_completed(ifp);
2842 return;
2843 }
2844
2845 if (!(idev->if_flags & IF_READY)) {
2846 spin_unlock(&ifp->lock);
2847 read_unlock_bh(&idev->lock);
2848 /*
2849 * If the device is not ready:
2850 * - keep it tentative if it is a permanent address.
2851 * - otherwise, kill it.
2852 */
2853 in6_ifa_hold(ifp);
2854 addrconf_dad_stop(ifp, 0);
2855 return;
2856 }
2857
2858 /*
2859 * Optimistic nodes can start receiving
2860 * Frames right away
2861 */
2862 if(ifp->flags & IFA_F_OPTIMISTIC)
2863 ip6_ins_rt(ifp->rt);
2864
2865 addrconf_dad_kick(ifp);
2866 spin_unlock(&ifp->lock);
2867 out:
2868 read_unlock_bh(&idev->lock);
2869 }
2870
2871 static void addrconf_dad_timer(unsigned long data)
2872 {
2873 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2874 struct inet6_dev *idev = ifp->idev;
2875 struct in6_addr mcaddr;
2876
2877 read_lock(&idev->lock);
2878 if (idev->dead || !(idev->if_flags & IF_READY)) {
2879 read_unlock(&idev->lock);
2880 goto out;
2881 }
2882
2883 spin_lock(&ifp->lock);
2884 if (ifp->probes == 0) {
2885 /*
2886 * DAD was successful
2887 */
2888
2889 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
2890 spin_unlock(&ifp->lock);
2891 read_unlock(&idev->lock);
2892
2893 addrconf_dad_completed(ifp);
2894
2895 goto out;
2896 }
2897
2898 ifp->probes--;
2899 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2900 spin_unlock(&ifp->lock);
2901 read_unlock(&idev->lock);
2902
2903 /* send a neighbour solicitation for our addr */
2904 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2905 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
2906 out:
2907 in6_ifa_put(ifp);
2908 }
2909
2910 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2911 {
2912 struct net_device * dev = ifp->idev->dev;
2913
2914 /*
2915 * Configure the address for reception. Now it is valid.
2916 */
2917
2918 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2919
2920 /* If added prefix is link local and forwarding is off,
2921 start sending router solicitations.
2922 */
2923
2924 if (ifp->idev->cnf.forwarding == 0 &&
2925 ifp->idev->cnf.rtr_solicits > 0 &&
2926 (dev->flags&IFF_LOOPBACK) == 0 &&
2927 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2928 /*
2929 * If a host as already performed a random delay
2930 * [...] as part of DAD [...] there is no need
2931 * to delay again before sending the first RS
2932 */
2933 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2934
2935 spin_lock_bh(&ifp->lock);
2936 ifp->probes = 1;
2937 ifp->idev->if_flags |= IF_RS_SENT;
2938 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2939 spin_unlock_bh(&ifp->lock);
2940 }
2941 }
2942
2943 static void addrconf_dad_run(struct inet6_dev *idev) {
2944 struct inet6_ifaddr *ifp;
2945
2946 read_lock_bh(&idev->lock);
2947 for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2948 spin_lock(&ifp->lock);
2949 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2950 spin_unlock(&ifp->lock);
2951 continue;
2952 }
2953 spin_unlock(&ifp->lock);
2954 addrconf_dad_kick(ifp);
2955 }
2956 read_unlock_bh(&idev->lock);
2957 }
2958
2959 #ifdef CONFIG_PROC_FS
2960 struct if6_iter_state {
2961 struct seq_net_private p;
2962 int bucket;
2963 };
2964
2965 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2966 {
2967 struct inet6_ifaddr *ifa = NULL;
2968 struct if6_iter_state *state = seq->private;
2969 struct net *net = seq_file_net(seq);
2970
2971 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2972 ifa = inet6_addr_lst[state->bucket];
2973
2974 while (ifa && !net_eq(dev_net(ifa->idev->dev), net))
2975 ifa = ifa->lst_next;
2976 if (ifa)
2977 break;
2978 }
2979 return ifa;
2980 }
2981
2982 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2983 {
2984 struct if6_iter_state *state = seq->private;
2985 struct net *net = seq_file_net(seq);
2986
2987 ifa = ifa->lst_next;
2988 try_again:
2989 if (ifa) {
2990 if (!net_eq(dev_net(ifa->idev->dev), net)) {
2991 ifa = ifa->lst_next;
2992 goto try_again;
2993 }
2994 }
2995
2996 if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2997 ifa = inet6_addr_lst[state->bucket];
2998 goto try_again;
2999 }
3000
3001 return ifa;
3002 }
3003
3004 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
3005 {
3006 struct inet6_ifaddr *ifa = if6_get_first(seq);
3007
3008 if (ifa)
3009 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
3010 --pos;
3011 return pos ? NULL : ifa;
3012 }
3013
3014 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3015 __acquires(addrconf_hash_lock)
3016 {
3017 read_lock_bh(&addrconf_hash_lock);
3018 return if6_get_idx(seq, *pos);
3019 }
3020
3021 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3022 {
3023 struct inet6_ifaddr *ifa;
3024
3025 ifa = if6_get_next(seq, v);
3026 ++*pos;
3027 return ifa;
3028 }
3029
3030 static void if6_seq_stop(struct seq_file *seq, void *v)
3031 __releases(addrconf_hash_lock)
3032 {
3033 read_unlock_bh(&addrconf_hash_lock);
3034 }
3035
3036 static int if6_seq_show(struct seq_file *seq, void *v)
3037 {
3038 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3039 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3040 &ifp->addr,
3041 ifp->idev->dev->ifindex,
3042 ifp->prefix_len,
3043 ifp->scope,
3044 ifp->flags,
3045 ifp->idev->dev->name);
3046 return 0;
3047 }
3048
3049 static const struct seq_operations if6_seq_ops = {
3050 .start = if6_seq_start,
3051 .next = if6_seq_next,
3052 .show = if6_seq_show,
3053 .stop = if6_seq_stop,
3054 };
3055
3056 static int if6_seq_open(struct inode *inode, struct file *file)
3057 {
3058 return seq_open_net(inode, file, &if6_seq_ops,
3059 sizeof(struct if6_iter_state));
3060 }
3061
3062 static const struct file_operations if6_fops = {
3063 .owner = THIS_MODULE,
3064 .open = if6_seq_open,
3065 .read = seq_read,
3066 .llseek = seq_lseek,
3067 .release = seq_release_net,
3068 };
3069
3070 static int __net_init if6_proc_net_init(struct net *net)
3071 {
3072 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
3073 return -ENOMEM;
3074 return 0;
3075 }
3076
3077 static void __net_exit if6_proc_net_exit(struct net *net)
3078 {
3079 proc_net_remove(net, "if_inet6");
3080 }
3081
3082 static struct pernet_operations if6_proc_net_ops = {
3083 .init = if6_proc_net_init,
3084 .exit = if6_proc_net_exit,
3085 };
3086
3087 int __init if6_proc_init(void)
3088 {
3089 return register_pernet_subsys(&if6_proc_net_ops);
3090 }
3091
3092 void if6_proc_exit(void)
3093 {
3094 unregister_pernet_subsys(&if6_proc_net_ops);
3095 }
3096 #endif /* CONFIG_PROC_FS */
3097
3098 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3099 /* Check if address is a home address configured on any interface. */
3100 int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr)
3101 {
3102 int ret = 0;
3103 struct inet6_ifaddr * ifp;
3104 u8 hash = ipv6_addr_hash(addr);
3105 read_lock_bh(&addrconf_hash_lock);
3106 for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) {
3107 if (!net_eq(dev_net(ifp->idev->dev), net))
3108 continue;
3109 if (ipv6_addr_equal(&ifp->addr, addr) &&
3110 (ifp->flags & IFA_F_HOMEADDRESS)) {
3111 ret = 1;
3112 break;
3113 }
3114 }
3115 read_unlock_bh(&addrconf_hash_lock);
3116 return ret;
3117 }
3118 #endif
3119
3120 /*
3121 * Periodic address status verification
3122 */
3123
3124 static void addrconf_verify(unsigned long foo)
3125 {
3126 struct inet6_ifaddr *ifp;
3127 unsigned long now, next;
3128 int i;
3129
3130 spin_lock_bh(&addrconf_verify_lock);
3131 now = jiffies;
3132 next = now + ADDR_CHECK_FREQUENCY;
3133
3134 del_timer(&addr_chk_timer);
3135
3136 for (i=0; i < IN6_ADDR_HSIZE; i++) {
3137
3138 restart:
3139 read_lock(&addrconf_hash_lock);
3140 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
3141 unsigned long age;
3142 #ifdef CONFIG_IPV6_PRIVACY
3143 unsigned long regen_advance;
3144 #endif
3145
3146 if (ifp->flags & IFA_F_PERMANENT)
3147 continue;
3148
3149 spin_lock(&ifp->lock);
3150 age = (now - ifp->tstamp) / HZ;
3151
3152 #ifdef CONFIG_IPV6_PRIVACY
3153 regen_advance = ifp->idev->cnf.regen_max_retry *
3154 ifp->idev->cnf.dad_transmits *
3155 ifp->idev->nd_parms->retrans_time / HZ;
3156 #endif
3157
3158 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3159 age >= ifp->valid_lft) {
3160 spin_unlock(&ifp->lock);
3161 in6_ifa_hold(ifp);
3162 read_unlock(&addrconf_hash_lock);
3163 ipv6_del_addr(ifp);
3164 goto restart;
3165 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3166 spin_unlock(&ifp->lock);
3167 continue;
3168 } else if (age >= ifp->prefered_lft) {
3169 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3170 int deprecate = 0;
3171
3172 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3173 deprecate = 1;
3174 ifp->flags |= IFA_F_DEPRECATED;
3175 }
3176
3177 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3178 next = ifp->tstamp + ifp->valid_lft * HZ;
3179
3180 spin_unlock(&ifp->lock);
3181
3182 if (deprecate) {
3183 in6_ifa_hold(ifp);
3184 read_unlock(&addrconf_hash_lock);
3185
3186 ipv6_ifa_notify(0, ifp);
3187 in6_ifa_put(ifp);
3188 goto restart;
3189 }
3190 #ifdef CONFIG_IPV6_PRIVACY
3191 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3192 !(ifp->flags&IFA_F_TENTATIVE)) {
3193 if (age >= ifp->prefered_lft - regen_advance) {
3194 struct inet6_ifaddr *ifpub = ifp->ifpub;
3195 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3196 next = ifp->tstamp + ifp->prefered_lft * HZ;
3197 if (!ifp->regen_count && ifpub) {
3198 ifp->regen_count++;
3199 in6_ifa_hold(ifp);
3200 in6_ifa_hold(ifpub);
3201 spin_unlock(&ifp->lock);
3202 read_unlock(&addrconf_hash_lock);
3203 spin_lock(&ifpub->lock);
3204 ifpub->regen_count = 0;
3205 spin_unlock(&ifpub->lock);
3206 ipv6_create_tempaddr(ifpub, ifp);
3207 in6_ifa_put(ifpub);
3208 in6_ifa_put(ifp);
3209 goto restart;
3210 }
3211 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3212 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3213 spin_unlock(&ifp->lock);
3214 #endif
3215 } else {
3216 /* ifp->prefered_lft <= ifp->valid_lft */
3217 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3218 next = ifp->tstamp + ifp->prefered_lft * HZ;
3219 spin_unlock(&ifp->lock);
3220 }
3221 }
3222 read_unlock(&addrconf_hash_lock);
3223 }
3224
3225 addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
3226 add_timer(&addr_chk_timer);
3227 spin_unlock_bh(&addrconf_verify_lock);
3228 }
3229
3230 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3231 {
3232 struct in6_addr *pfx = NULL;
3233
3234 if (addr)
3235 pfx = nla_data(addr);
3236
3237 if (local) {
3238 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3239 pfx = NULL;
3240 else
3241 pfx = nla_data(local);
3242 }
3243
3244 return pfx;
3245 }
3246
3247 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3248 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3249 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3250 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3251 };
3252
3253 static int
3254 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3255 {
3256 struct net *net = sock_net(skb->sk);
3257 struct ifaddrmsg *ifm;
3258 struct nlattr *tb[IFA_MAX+1];
3259 struct in6_addr *pfx;
3260 int err;
3261
3262 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3263 if (err < 0)
3264 return err;
3265
3266 ifm = nlmsg_data(nlh);
3267 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3268 if (pfx == NULL)
3269 return -EINVAL;
3270
3271 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3272 }
3273
3274 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3275 u32 prefered_lft, u32 valid_lft)
3276 {
3277 u32 flags;
3278 clock_t expires;
3279 unsigned long timeout;
3280
3281 if (!valid_lft || (prefered_lft > valid_lft))
3282 return -EINVAL;
3283
3284 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3285 if (addrconf_finite_timeout(timeout)) {
3286 expires = jiffies_to_clock_t(timeout * HZ);
3287 valid_lft = timeout;
3288 flags = RTF_EXPIRES;
3289 } else {
3290 expires = 0;
3291 flags = 0;
3292 ifa_flags |= IFA_F_PERMANENT;
3293 }
3294
3295 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3296 if (addrconf_finite_timeout(timeout)) {
3297 if (timeout == 0)
3298 ifa_flags |= IFA_F_DEPRECATED;
3299 prefered_lft = timeout;
3300 }
3301
3302 spin_lock_bh(&ifp->lock);
3303 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3304 ifp->tstamp = jiffies;
3305 ifp->valid_lft = valid_lft;
3306 ifp->prefered_lft = prefered_lft;
3307
3308 spin_unlock_bh(&ifp->lock);
3309 if (!(ifp->flags&IFA_F_TENTATIVE))
3310 ipv6_ifa_notify(0, ifp);
3311
3312 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3313 expires, flags);
3314 addrconf_verify(0);
3315
3316 return 0;
3317 }
3318
3319 static int
3320 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3321 {
3322 struct net *net = sock_net(skb->sk);
3323 struct ifaddrmsg *ifm;
3324 struct nlattr *tb[IFA_MAX+1];
3325 struct in6_addr *pfx;
3326 struct inet6_ifaddr *ifa;
3327 struct net_device *dev;
3328 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3329 u8 ifa_flags;
3330 int err;
3331
3332 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3333 if (err < 0)
3334 return err;
3335
3336 ifm = nlmsg_data(nlh);
3337 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3338 if (pfx == NULL)
3339 return -EINVAL;
3340
3341 if (tb[IFA_CACHEINFO]) {
3342 struct ifa_cacheinfo *ci;
3343
3344 ci = nla_data(tb[IFA_CACHEINFO]);
3345 valid_lft = ci->ifa_valid;
3346 preferred_lft = ci->ifa_prefered;
3347 } else {
3348 preferred_lft = INFINITY_LIFE_TIME;
3349 valid_lft = INFINITY_LIFE_TIME;
3350 }
3351
3352 dev = __dev_get_by_index(net, ifm->ifa_index);
3353 if (dev == NULL)
3354 return -ENODEV;
3355
3356 /* We ignore other flags so far. */
3357 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3358
3359 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3360 if (ifa == NULL) {
3361 /*
3362 * It would be best to check for !NLM_F_CREATE here but
3363 * userspace alreay relies on not having to provide this.
3364 */
3365 return inet6_addr_add(net, ifm->ifa_index, pfx,
3366 ifm->ifa_prefixlen, ifa_flags,
3367 preferred_lft, valid_lft);
3368 }
3369
3370 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3371 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3372 err = -EEXIST;
3373 else
3374 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3375
3376 in6_ifa_put(ifa);
3377
3378 return err;
3379 }
3380
3381 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3382 u8 scope, int ifindex)
3383 {
3384 struct ifaddrmsg *ifm;
3385
3386 ifm = nlmsg_data(nlh);
3387 ifm->ifa_family = AF_INET6;
3388 ifm->ifa_prefixlen = prefixlen;
3389 ifm->ifa_flags = flags;
3390 ifm->ifa_scope = scope;
3391 ifm->ifa_index = ifindex;
3392 }
3393
3394 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3395 unsigned long tstamp, u32 preferred, u32 valid)
3396 {
3397 struct ifa_cacheinfo ci;
3398
3399 ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3400 + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3401 ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3402 + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3403 ci.ifa_prefered = preferred;
3404 ci.ifa_valid = valid;
3405
3406 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3407 }
3408
3409 static inline int rt_scope(int ifa_scope)
3410 {
3411 if (ifa_scope & IFA_HOST)
3412 return RT_SCOPE_HOST;
3413 else if (ifa_scope & IFA_LINK)
3414 return RT_SCOPE_LINK;
3415 else if (ifa_scope & IFA_SITE)
3416 return RT_SCOPE_SITE;
3417 else
3418 return RT_SCOPE_UNIVERSE;
3419 }
3420
3421 static inline int inet6_ifaddr_msgsize(void)
3422 {
3423 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3424 + nla_total_size(16) /* IFA_ADDRESS */
3425 + nla_total_size(sizeof(struct ifa_cacheinfo));
3426 }
3427
3428 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3429 u32 pid, u32 seq, int event, unsigned int flags)
3430 {
3431 struct nlmsghdr *nlh;
3432 u32 preferred, valid;
3433
3434 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3435 if (nlh == NULL)
3436 return -EMSGSIZE;
3437
3438 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3439 ifa->idev->dev->ifindex);
3440
3441 if (!(ifa->flags&IFA_F_PERMANENT)) {
3442 preferred = ifa->prefered_lft;
3443 valid = ifa->valid_lft;
3444 if (preferred != INFINITY_LIFE_TIME) {
3445 long tval = (jiffies - ifa->tstamp)/HZ;
3446 if (preferred > tval)
3447 preferred -= tval;
3448 else
3449 preferred = 0;
3450 if (valid != INFINITY_LIFE_TIME)
3451 valid -= tval;
3452 }
3453 } else {
3454 preferred = INFINITY_LIFE_TIME;
3455 valid = INFINITY_LIFE_TIME;
3456 }
3457
3458 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3459 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3460 nlmsg_cancel(skb, nlh);
3461 return -EMSGSIZE;
3462 }
3463
3464 return nlmsg_end(skb, nlh);
3465 }
3466
3467 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3468 u32 pid, u32 seq, int event, u16 flags)
3469 {
3470 struct nlmsghdr *nlh;
3471 u8 scope = RT_SCOPE_UNIVERSE;
3472 int ifindex = ifmca->idev->dev->ifindex;
3473
3474 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3475 scope = RT_SCOPE_SITE;
3476
3477 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3478 if (nlh == NULL)
3479 return -EMSGSIZE;
3480
3481 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3482 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3483 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3484 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3485 nlmsg_cancel(skb, nlh);
3486 return -EMSGSIZE;
3487 }
3488
3489 return nlmsg_end(skb, nlh);
3490 }
3491
3492 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3493 u32 pid, u32 seq, int event, unsigned int flags)
3494 {
3495 struct nlmsghdr *nlh;
3496 u8 scope = RT_SCOPE_UNIVERSE;
3497 int ifindex = ifaca->aca_idev->dev->ifindex;
3498
3499 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3500 scope = RT_SCOPE_SITE;
3501
3502 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3503 if (nlh == NULL)
3504 return -EMSGSIZE;
3505
3506 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3507 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3508 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3509 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3510 nlmsg_cancel(skb, nlh);
3511 return -EMSGSIZE;
3512 }
3513
3514 return nlmsg_end(skb, nlh);
3515 }
3516
3517 enum addr_type_t
3518 {
3519 UNICAST_ADDR,
3520 MULTICAST_ADDR,
3521 ANYCAST_ADDR,
3522 };
3523
3524 /* called with rcu_read_lock() */
3525 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3526 struct netlink_callback *cb, enum addr_type_t type,
3527 int s_ip_idx, int *p_ip_idx)
3528 {
3529 struct inet6_ifaddr *ifa;
3530 struct ifmcaddr6 *ifmca;
3531 struct ifacaddr6 *ifaca;
3532 int err = 1;
3533 int ip_idx = *p_ip_idx;
3534
3535 read_lock_bh(&idev->lock);
3536 switch (type) {
3537 case UNICAST_ADDR:
3538 /* unicast address incl. temp addr */
3539 for (ifa = idev->addr_list; ifa;
3540 ifa = ifa->if_next, ip_idx++) {
3541 if (ip_idx < s_ip_idx)
3542 continue;
3543 err = inet6_fill_ifaddr(skb, ifa,
3544 NETLINK_CB(cb->skb).pid,
3545 cb->nlh->nlmsg_seq,
3546 RTM_NEWADDR,
3547 NLM_F_MULTI);
3548 if (err <= 0)
3549 break;
3550 }
3551 break;
3552 case MULTICAST_ADDR:
3553 /* multicast address */
3554 for (ifmca = idev->mc_list; ifmca;
3555 ifmca = ifmca->next, ip_idx++) {
3556 if (ip_idx < s_ip_idx)
3557 continue;
3558 err = inet6_fill_ifmcaddr(skb, ifmca,
3559 NETLINK_CB(cb->skb).pid,
3560 cb->nlh->nlmsg_seq,
3561 RTM_GETMULTICAST,
3562 NLM_F_MULTI);
3563 if (err <= 0)
3564 break;
3565 }
3566 break;
3567 case ANYCAST_ADDR:
3568 /* anycast address */
3569 for (ifaca = idev->ac_list; ifaca;
3570 ifaca = ifaca->aca_next, ip_idx++) {
3571 if (ip_idx < s_ip_idx)
3572 continue;
3573 err = inet6_fill_ifacaddr(skb, ifaca,
3574 NETLINK_CB(cb->skb).pid,
3575 cb->nlh->nlmsg_seq,
3576 RTM_GETANYCAST,
3577 NLM_F_MULTI);
3578 if (err <= 0)
3579 break;
3580 }
3581 break;
3582 default:
3583 break;
3584 }
3585 read_unlock_bh(&idev->lock);
3586 *p_ip_idx = ip_idx;
3587 return err;
3588 }
3589
3590 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3591 enum addr_type_t type)
3592 {
3593 struct net *net = sock_net(skb->sk);
3594 int h, s_h;
3595 int idx, ip_idx;
3596 int s_idx, s_ip_idx;
3597 struct net_device *dev;
3598 struct inet6_dev *idev;
3599 struct hlist_head *head;
3600 struct hlist_node *node;
3601
3602 s_h = cb->args[0];
3603 s_idx = idx = cb->args[1];
3604 s_ip_idx = ip_idx = cb->args[2];
3605
3606 rcu_read_lock();
3607 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3608 idx = 0;
3609 head = &net->dev_index_head[h];
3610 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3611 if (idx < s_idx)
3612 goto cont;
3613 if (h > s_h || idx > s_idx)
3614 s_ip_idx = 0;
3615 ip_idx = 0;
3616 if ((idev = __in6_dev_get(dev)) == NULL)
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 if ((ifa = ipv6_get_ifaddr(net, addr, dev, 1)) == NULL) {
3684 err = -EADDRNOTAVAIL;
3685 goto errout;
3686 }
3687
3688 if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) {
3689 err = -ENOBUFS;
3690 goto errout_ifa;
3691 }
3692
3693 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3694 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3695 if (err < 0) {
3696 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3697 WARN_ON(err == -EMSGSIZE);
3698 kfree_skb(skb);
3699 goto errout_ifa;
3700 }
3701 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
3702 errout_ifa:
3703 in6_ifa_put(ifa);
3704 errout:
3705 return err;
3706 }
3707
3708 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3709 {
3710 struct sk_buff *skb;
3711 struct net *net = dev_net(ifa->idev->dev);
3712 int err = -ENOBUFS;
3713
3714 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3715 if (skb == NULL)
3716 goto errout;
3717
3718 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3719 if (err < 0) {
3720 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3721 WARN_ON(err == -EMSGSIZE);
3722 kfree_skb(skb);
3723 goto errout;
3724 }
3725 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3726 return;
3727 errout:
3728 if (err < 0)
3729 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3730 }
3731
3732 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3733 __s32 *array, int bytes)
3734 {
3735 BUG_ON(bytes < (DEVCONF_MAX * 4));
3736
3737 memset(array, 0, bytes);
3738 array[DEVCONF_FORWARDING] = cnf->forwarding;
3739 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3740 array[DEVCONF_MTU6] = cnf->mtu6;
3741 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3742 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3743 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3744 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3745 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3746 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3747 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3748 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3749 #ifdef CONFIG_IPV6_PRIVACY
3750 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3751 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3752 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3753 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3754 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3755 #endif
3756 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3757 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3758 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3759 #ifdef CONFIG_IPV6_ROUTER_PREF
3760 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3761 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
3762 #ifdef CONFIG_IPV6_ROUTE_INFO
3763 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3764 #endif
3765 #endif
3766 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3767 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3768 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3769 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3770 #endif
3771 #ifdef CONFIG_IPV6_MROUTE
3772 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
3773 #endif
3774 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
3775 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
3776 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
3777 }
3778
3779 static inline size_t inet6_if_nlmsg_size(void)
3780 {
3781 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3782 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3783 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3784 + nla_total_size(4) /* IFLA_MTU */
3785 + nla_total_size(4) /* IFLA_LINK */
3786 + nla_total_size( /* IFLA_PROTINFO */
3787 nla_total_size(4) /* IFLA_INET6_FLAGS */
3788 + nla_total_size(sizeof(struct ifla_cacheinfo))
3789 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3790 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3791 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
3792 );
3793 }
3794
3795 static inline void __snmp6_fill_stats(u64 *stats, void __percpu **mib,
3796 int items, int bytes)
3797 {
3798 int i;
3799 int pad = bytes - sizeof(u64) * items;
3800 BUG_ON(pad < 0);
3801
3802 /* Use put_unaligned() because stats may not be aligned for u64. */
3803 put_unaligned(items, &stats[0]);
3804 for (i = 1; i < items; i++)
3805 put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3806
3807 memset(&stats[items], 0, pad);
3808 }
3809
3810 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3811 int bytes)
3812 {
3813 switch(attrtype) {
3814 case IFLA_INET6_STATS:
3815 __snmp6_fill_stats(stats, (void __percpu **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes);
3816 break;
3817 case IFLA_INET6_ICMP6STATS:
3818 __snmp6_fill_stats(stats, (void __percpu **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
3819 break;
3820 }
3821 }
3822
3823 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3824 u32 pid, u32 seq, int event, unsigned int flags)
3825 {
3826 struct net_device *dev = idev->dev;
3827 struct nlattr *nla;
3828 struct ifinfomsg *hdr;
3829 struct nlmsghdr *nlh;
3830 void *protoinfo;
3831 struct ifla_cacheinfo ci;
3832
3833 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3834 if (nlh == NULL)
3835 return -EMSGSIZE;
3836
3837 hdr = nlmsg_data(nlh);
3838 hdr->ifi_family = AF_INET6;
3839 hdr->__ifi_pad = 0;
3840 hdr->ifi_type = dev->type;
3841 hdr->ifi_index = dev->ifindex;
3842 hdr->ifi_flags = dev_get_flags(dev);
3843 hdr->ifi_change = 0;
3844
3845 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
3846
3847 if (dev->addr_len)
3848 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3849
3850 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
3851 if (dev->ifindex != dev->iflink)
3852 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
3853
3854 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3855 if (protoinfo == NULL)
3856 goto nla_put_failure;
3857
3858 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
3859
3860 ci.max_reasm_len = IPV6_MAXPLEN;
3861 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3862 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3863 ci.reachable_time = idev->nd_parms->reachable_time;
3864 ci.retrans_time = idev->nd_parms->retrans_time;
3865 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3866
3867 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3868 if (nla == NULL)
3869 goto nla_put_failure;
3870 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
3871
3872 /* XXX - MC not implemented */
3873
3874 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3875 if (nla == NULL)
3876 goto nla_put_failure;
3877 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3878
3879 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3880 if (nla == NULL)
3881 goto nla_put_failure;
3882 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
3883
3884 nla_nest_end(skb, protoinfo);
3885 return nlmsg_end(skb, nlh);
3886
3887 nla_put_failure:
3888 nlmsg_cancel(skb, nlh);
3889 return -EMSGSIZE;
3890 }
3891
3892 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3893 {
3894 struct net *net = sock_net(skb->sk);
3895 int h, s_h;
3896 int idx = 0, s_idx;
3897 struct net_device *dev;
3898 struct inet6_dev *idev;
3899 struct hlist_head *head;
3900 struct hlist_node *node;
3901
3902 s_h = cb->args[0];
3903 s_idx = cb->args[1];
3904
3905 rcu_read_lock();
3906 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3907 idx = 0;
3908 head = &net->dev_index_head[h];
3909 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3910 if (idx < s_idx)
3911 goto cont;
3912 idev = __in6_dev_get(dev);
3913 if (!idev)
3914 goto cont;
3915 if (inet6_fill_ifinfo(skb, idev,
3916 NETLINK_CB(cb->skb).pid,
3917 cb->nlh->nlmsg_seq,
3918 RTM_NEWLINK, NLM_F_MULTI) <= 0)
3919 goto out;
3920 cont:
3921 idx++;
3922 }
3923 }
3924 out:
3925 rcu_read_unlock();
3926 cb->args[1] = idx;
3927 cb->args[0] = h;
3928
3929 return skb->len;
3930 }
3931
3932 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3933 {
3934 struct sk_buff *skb;
3935 struct net *net = dev_net(idev->dev);
3936 int err = -ENOBUFS;
3937
3938 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
3939 if (skb == NULL)
3940 goto errout;
3941
3942 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
3943 if (err < 0) {
3944 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3945 WARN_ON(err == -EMSGSIZE);
3946 kfree_skb(skb);
3947 goto errout;
3948 }
3949 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3950 return;
3951 errout:
3952 if (err < 0)
3953 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3954 }
3955
3956 static inline size_t inet6_prefix_nlmsg_size(void)
3957 {
3958 return NLMSG_ALIGN(sizeof(struct prefixmsg))
3959 + nla_total_size(sizeof(struct in6_addr))
3960 + nla_total_size(sizeof(struct prefix_cacheinfo));
3961 }
3962
3963 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
3964 struct prefix_info *pinfo, u32 pid, u32 seq,
3965 int event, unsigned int flags)
3966 {
3967 struct prefixmsg *pmsg;
3968 struct nlmsghdr *nlh;
3969 struct prefix_cacheinfo ci;
3970
3971 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
3972 if (nlh == NULL)
3973 return -EMSGSIZE;
3974
3975 pmsg = nlmsg_data(nlh);
3976 pmsg->prefix_family = AF_INET6;
3977 pmsg->prefix_pad1 = 0;
3978 pmsg->prefix_pad2 = 0;
3979 pmsg->prefix_ifindex = idev->dev->ifindex;
3980 pmsg->prefix_len = pinfo->prefix_len;
3981 pmsg->prefix_type = pinfo->type;
3982 pmsg->prefix_pad3 = 0;
3983 pmsg->prefix_flags = 0;
3984 if (pinfo->onlink)
3985 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3986 if (pinfo->autoconf)
3987 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3988
3989 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
3990
3991 ci.preferred_time = ntohl(pinfo->prefered);
3992 ci.valid_time = ntohl(pinfo->valid);
3993 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
3994
3995 return nlmsg_end(skb, nlh);
3996
3997 nla_put_failure:
3998 nlmsg_cancel(skb, nlh);
3999 return -EMSGSIZE;
4000 }
4001
4002 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
4003 struct prefix_info *pinfo)
4004 {
4005 struct sk_buff *skb;
4006 struct net *net = dev_net(idev->dev);
4007 int err = -ENOBUFS;
4008
4009 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
4010 if (skb == NULL)
4011 goto errout;
4012
4013 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
4014 if (err < 0) {
4015 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4016 WARN_ON(err == -EMSGSIZE);
4017 kfree_skb(skb);
4018 goto errout;
4019 }
4020 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4021 return;
4022 errout:
4023 if (err < 0)
4024 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
4025 }
4026
4027 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4028 {
4029 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4030
4031 switch (event) {
4032 case RTM_NEWADDR:
4033 /*
4034 * If the address was optimistic
4035 * we inserted the route at the start of
4036 * our DAD process, so we don't need
4037 * to do it again
4038 */
4039 if (!(ifp->rt->rt6i_node))
4040 ip6_ins_rt(ifp->rt);
4041 if (ifp->idev->cnf.forwarding)
4042 addrconf_join_anycast(ifp);
4043 break;
4044 case RTM_DELADDR:
4045 if (ifp->idev->cnf.forwarding)
4046 addrconf_leave_anycast(ifp);
4047 addrconf_leave_solict(ifp->idev, &ifp->addr);
4048 dst_hold(&ifp->rt->u.dst);
4049 if (ip6_del_rt(ifp->rt))
4050 dst_free(&ifp->rt->u.dst);
4051 break;
4052 }
4053 }
4054
4055 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4056 {
4057 rcu_read_lock_bh();
4058 if (likely(ifp->idev->dead == 0))
4059 __ipv6_ifa_notify(event, ifp);
4060 rcu_read_unlock_bh();
4061 }
4062
4063 #ifdef CONFIG_SYSCTL
4064
4065 static
4066 int addrconf_sysctl_forward(ctl_table *ctl, int write,
4067 void __user *buffer, size_t *lenp, loff_t *ppos)
4068 {
4069 int *valp = ctl->data;
4070 int val = *valp;
4071 loff_t pos = *ppos;
4072 int ret;
4073
4074 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
4075
4076 if (write)
4077 ret = addrconf_fixup_forwarding(ctl, valp, val);
4078 if (ret)
4079 *ppos = pos;
4080 return ret;
4081 }
4082
4083 static void dev_disable_change(struct inet6_dev *idev)
4084 {
4085 if (!idev || !idev->dev)
4086 return;
4087
4088 if (idev->cnf.disable_ipv6)
4089 addrconf_notify(NULL, NETDEV_DOWN, idev->dev);
4090 else
4091 addrconf_notify(NULL, NETDEV_UP, idev->dev);
4092 }
4093
4094 static void addrconf_disable_change(struct net *net, __s32 newf)
4095 {
4096 struct net_device *dev;
4097 struct inet6_dev *idev;
4098
4099 rcu_read_lock();
4100 for_each_netdev_rcu(net, dev) {
4101 idev = __in6_dev_get(dev);
4102 if (idev) {
4103 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4104 idev->cnf.disable_ipv6 = newf;
4105 if (changed)
4106 dev_disable_change(idev);
4107 }
4108 }
4109 rcu_read_unlock();
4110 }
4111
4112 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int old)
4113 {
4114 struct net *net;
4115
4116 net = (struct net *)table->extra2;
4117
4118 if (p == &net->ipv6.devconf_dflt->disable_ipv6)
4119 return 0;
4120
4121 if (!rtnl_trylock()) {
4122 /* Restore the original values before restarting */
4123 *p = old;
4124 return restart_syscall();
4125 }
4126
4127 if (p == &net->ipv6.devconf_all->disable_ipv6) {
4128 __s32 newf = net->ipv6.devconf_all->disable_ipv6;
4129 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4130 addrconf_disable_change(net, newf);
4131 } else if ((!*p) ^ (!old))
4132 dev_disable_change((struct inet6_dev *)table->extra1);
4133
4134 rtnl_unlock();
4135 return 0;
4136 }
4137
4138 static
4139 int addrconf_sysctl_disable(ctl_table *ctl, int write,
4140 void __user *buffer, size_t *lenp, loff_t *ppos)
4141 {
4142 int *valp = ctl->data;
4143 int val = *valp;
4144 loff_t pos = *ppos;
4145 int ret;
4146
4147 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
4148
4149 if (write)
4150 ret = addrconf_disable_ipv6(ctl, valp, val);
4151 if (ret)
4152 *ppos = pos;
4153 return ret;
4154 }
4155
4156 static struct addrconf_sysctl_table
4157 {
4158 struct ctl_table_header *sysctl_header;
4159 ctl_table addrconf_vars[DEVCONF_MAX+1];
4160 char *dev_name;
4161 } addrconf_sysctl __read_mostly = {
4162 .sysctl_header = NULL,
4163 .addrconf_vars = {
4164 {
4165 .procname = "forwarding",
4166 .data = &ipv6_devconf.forwarding,
4167 .maxlen = sizeof(int),
4168 .mode = 0644,
4169 .proc_handler = addrconf_sysctl_forward,
4170 },
4171 {
4172 .procname = "hop_limit",
4173 .data = &ipv6_devconf.hop_limit,
4174 .maxlen = sizeof(int),
4175 .mode = 0644,
4176 .proc_handler = proc_dointvec,
4177 },
4178 {
4179 .procname = "mtu",
4180 .data = &ipv6_devconf.mtu6,
4181 .maxlen = sizeof(int),
4182 .mode = 0644,
4183 .proc_handler = proc_dointvec,
4184 },
4185 {
4186 .procname = "accept_ra",
4187 .data = &ipv6_devconf.accept_ra,
4188 .maxlen = sizeof(int),
4189 .mode = 0644,
4190 .proc_handler = proc_dointvec,
4191 },
4192 {
4193 .procname = "accept_redirects",
4194 .data = &ipv6_devconf.accept_redirects,
4195 .maxlen = sizeof(int),
4196 .mode = 0644,
4197 .proc_handler = proc_dointvec,
4198 },
4199 {
4200 .procname = "autoconf",
4201 .data = &ipv6_devconf.autoconf,
4202 .maxlen = sizeof(int),
4203 .mode = 0644,
4204 .proc_handler = proc_dointvec,
4205 },
4206 {
4207 .procname = "dad_transmits",
4208 .data = &ipv6_devconf.dad_transmits,
4209 .maxlen = sizeof(int),
4210 .mode = 0644,
4211 .proc_handler = proc_dointvec,
4212 },
4213 {
4214 .procname = "router_solicitations",
4215 .data = &ipv6_devconf.rtr_solicits,
4216 .maxlen = sizeof(int),
4217 .mode = 0644,
4218 .proc_handler = proc_dointvec,
4219 },
4220 {
4221 .procname = "router_solicitation_interval",
4222 .data = &ipv6_devconf.rtr_solicit_interval,
4223 .maxlen = sizeof(int),
4224 .mode = 0644,
4225 .proc_handler = proc_dointvec_jiffies,
4226 },
4227 {
4228 .procname = "router_solicitation_delay",
4229 .data = &ipv6_devconf.rtr_solicit_delay,
4230 .maxlen = sizeof(int),
4231 .mode = 0644,
4232 .proc_handler = proc_dointvec_jiffies,
4233 },
4234 {
4235 .procname = "force_mld_version",
4236 .data = &ipv6_devconf.force_mld_version,
4237 .maxlen = sizeof(int),
4238 .mode = 0644,
4239 .proc_handler = proc_dointvec,
4240 },
4241 #ifdef CONFIG_IPV6_PRIVACY
4242 {
4243 .procname = "use_tempaddr",
4244 .data = &ipv6_devconf.use_tempaddr,
4245 .maxlen = sizeof(int),
4246 .mode = 0644,
4247 .proc_handler = proc_dointvec,
4248 },
4249 {
4250 .procname = "temp_valid_lft",
4251 .data = &ipv6_devconf.temp_valid_lft,
4252 .maxlen = sizeof(int),
4253 .mode = 0644,
4254 .proc_handler = proc_dointvec,
4255 },
4256 {
4257 .procname = "temp_prefered_lft",
4258 .data = &ipv6_devconf.temp_prefered_lft,
4259 .maxlen = sizeof(int),
4260 .mode = 0644,
4261 .proc_handler = proc_dointvec,
4262 },
4263 {
4264 .procname = "regen_max_retry",
4265 .data = &ipv6_devconf.regen_max_retry,
4266 .maxlen = sizeof(int),
4267 .mode = 0644,
4268 .proc_handler = proc_dointvec,
4269 },
4270 {
4271 .procname = "max_desync_factor",
4272 .data = &ipv6_devconf.max_desync_factor,
4273 .maxlen = sizeof(int),
4274 .mode = 0644,
4275 .proc_handler = proc_dointvec,
4276 },
4277 #endif
4278 {
4279 .procname = "max_addresses",
4280 .data = &ipv6_devconf.max_addresses,
4281 .maxlen = sizeof(int),
4282 .mode = 0644,
4283 .proc_handler = proc_dointvec,
4284 },
4285 {
4286 .procname = "accept_ra_defrtr",
4287 .data = &ipv6_devconf.accept_ra_defrtr,
4288 .maxlen = sizeof(int),
4289 .mode = 0644,
4290 .proc_handler = proc_dointvec,
4291 },
4292 {
4293 .procname = "accept_ra_pinfo",
4294 .data = &ipv6_devconf.accept_ra_pinfo,
4295 .maxlen = sizeof(int),
4296 .mode = 0644,
4297 .proc_handler = proc_dointvec,
4298 },
4299 #ifdef CONFIG_IPV6_ROUTER_PREF
4300 {
4301 .procname = "accept_ra_rtr_pref",
4302 .data = &ipv6_devconf.accept_ra_rtr_pref,
4303 .maxlen = sizeof(int),
4304 .mode = 0644,
4305 .proc_handler = proc_dointvec,
4306 },
4307 {
4308 .procname = "router_probe_interval",
4309 .data = &ipv6_devconf.rtr_probe_interval,
4310 .maxlen = sizeof(int),
4311 .mode = 0644,
4312 .proc_handler = proc_dointvec_jiffies,
4313 },
4314 #ifdef CONFIG_IPV6_ROUTE_INFO
4315 {
4316 .procname = "accept_ra_rt_info_max_plen",
4317 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4318 .maxlen = sizeof(int),
4319 .mode = 0644,
4320 .proc_handler = proc_dointvec,
4321 },
4322 #endif
4323 #endif
4324 {
4325 .procname = "proxy_ndp",
4326 .data = &ipv6_devconf.proxy_ndp,
4327 .maxlen = sizeof(int),
4328 .mode = 0644,
4329 .proc_handler = proc_dointvec,
4330 },
4331 {
4332 .procname = "accept_source_route",
4333 .data = &ipv6_devconf.accept_source_route,
4334 .maxlen = sizeof(int),
4335 .mode = 0644,
4336 .proc_handler = proc_dointvec,
4337 },
4338 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4339 {
4340 .procname = "optimistic_dad",
4341 .data = &ipv6_devconf.optimistic_dad,
4342 .maxlen = sizeof(int),
4343 .mode = 0644,
4344 .proc_handler = proc_dointvec,
4345
4346 },
4347 #endif
4348 #ifdef CONFIG_IPV6_MROUTE
4349 {
4350 .procname = "mc_forwarding",
4351 .data = &ipv6_devconf.mc_forwarding,
4352 .maxlen = sizeof(int),
4353 .mode = 0444,
4354 .proc_handler = proc_dointvec,
4355 },
4356 #endif
4357 {
4358 .procname = "disable_ipv6",
4359 .data = &ipv6_devconf.disable_ipv6,
4360 .maxlen = sizeof(int),
4361 .mode = 0644,
4362 .proc_handler = addrconf_sysctl_disable,
4363 },
4364 {
4365 .procname = "accept_dad",
4366 .data = &ipv6_devconf.accept_dad,
4367 .maxlen = sizeof(int),
4368 .mode = 0644,
4369 .proc_handler = proc_dointvec,
4370 },
4371 {
4372 .procname = "force_tllao",
4373 .data = &ipv6_devconf.force_tllao,
4374 .maxlen = sizeof(int),
4375 .mode = 0644,
4376 .proc_handler = proc_dointvec
4377 },
4378 {
4379 /* sentinel */
4380 }
4381 },
4382 };
4383
4384 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4385 struct inet6_dev *idev, struct ipv6_devconf *p)
4386 {
4387 int i;
4388 struct addrconf_sysctl_table *t;
4389
4390 #define ADDRCONF_CTL_PATH_DEV 3
4391
4392 struct ctl_path addrconf_ctl_path[] = {
4393 { .procname = "net", },
4394 { .procname = "ipv6", },
4395 { .procname = "conf", },
4396 { /* to be set */ },
4397 { },
4398 };
4399
4400
4401 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4402 if (t == NULL)
4403 goto out;
4404
4405 for (i=0; t->addrconf_vars[i].data; i++) {
4406 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
4407 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4408 t->addrconf_vars[i].extra2 = net;
4409 }
4410
4411 /*
4412 * Make a copy of dev_name, because '.procname' is regarded as const
4413 * by sysctl and we wouldn't want anyone to change it under our feet
4414 * (see SIOCSIFNAME).
4415 */
4416 t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4417 if (!t->dev_name)
4418 goto free;
4419
4420 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
4421
4422 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
4423 t->addrconf_vars);
4424 if (t->sysctl_header == NULL)
4425 goto free_procname;
4426
4427 p->sysctl = t;
4428 return 0;
4429
4430 free_procname:
4431 kfree(t->dev_name);
4432 free:
4433 kfree(t);
4434 out:
4435 return -ENOBUFS;
4436 }
4437
4438 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4439 {
4440 struct addrconf_sysctl_table *t;
4441
4442 if (p->sysctl == NULL)
4443 return;
4444
4445 t = p->sysctl;
4446 p->sysctl = NULL;
4447 unregister_sysctl_table(t->sysctl_header);
4448 kfree(t->dev_name);
4449 kfree(t);
4450 }
4451
4452 static void addrconf_sysctl_register(struct inet6_dev *idev)
4453 {
4454 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
4455 &ndisc_ifinfo_sysctl_change);
4456 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
4457 idev, &idev->cnf);
4458 }
4459
4460 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
4461 {
4462 __addrconf_sysctl_unregister(&idev->cnf);
4463 neigh_sysctl_unregister(idev->nd_parms);
4464 }
4465
4466
4467 #endif
4468
4469 static int __net_init addrconf_init_net(struct net *net)
4470 {
4471 int err;
4472 struct ipv6_devconf *all, *dflt;
4473
4474 err = -ENOMEM;
4475 all = &ipv6_devconf;
4476 dflt = &ipv6_devconf_dflt;
4477
4478 if (!net_eq(net, &init_net)) {
4479 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4480 if (all == NULL)
4481 goto err_alloc_all;
4482
4483 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4484 if (dflt == NULL)
4485 goto err_alloc_dflt;
4486 } else {
4487 /* these will be inherited by all namespaces */
4488 dflt->autoconf = ipv6_defaults.autoconf;
4489 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
4490 }
4491
4492 net->ipv6.devconf_all = all;
4493 net->ipv6.devconf_dflt = dflt;
4494
4495 #ifdef CONFIG_SYSCTL
4496 err = __addrconf_sysctl_register(net, "all", NULL, all);
4497 if (err < 0)
4498 goto err_reg_all;
4499
4500 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
4501 if (err < 0)
4502 goto err_reg_dflt;
4503 #endif
4504 return 0;
4505
4506 #ifdef CONFIG_SYSCTL
4507 err_reg_dflt:
4508 __addrconf_sysctl_unregister(all);
4509 err_reg_all:
4510 kfree(dflt);
4511 #endif
4512 err_alloc_dflt:
4513 kfree(all);
4514 err_alloc_all:
4515 return err;
4516 }
4517
4518 static void __net_exit addrconf_exit_net(struct net *net)
4519 {
4520 #ifdef CONFIG_SYSCTL
4521 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4522 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4523 #endif
4524 if (!net_eq(net, &init_net)) {
4525 kfree(net->ipv6.devconf_dflt);
4526 kfree(net->ipv6.devconf_all);
4527 }
4528 }
4529
4530 static struct pernet_operations addrconf_ops = {
4531 .init = addrconf_init_net,
4532 .exit = addrconf_exit_net,
4533 };
4534
4535 /*
4536 * Device notifier
4537 */
4538
4539 int register_inet6addr_notifier(struct notifier_block *nb)
4540 {
4541 return atomic_notifier_chain_register(&inet6addr_chain, nb);
4542 }
4543
4544 EXPORT_SYMBOL(register_inet6addr_notifier);
4545
4546 int unregister_inet6addr_notifier(struct notifier_block *nb)
4547 {
4548 return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
4549 }
4550
4551 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4552
4553 /*
4554 * Init / cleanup code
4555 */
4556
4557 int __init addrconf_init(void)
4558 {
4559 int err;
4560
4561 if ((err = ipv6_addr_label_init()) < 0) {
4562 printk(KERN_CRIT "IPv6 Addrconf: cannot initialize default policy table: %d.\n",
4563 err);
4564 return err;
4565 }
4566
4567 register_pernet_subsys(&addrconf_ops);
4568
4569 /* The addrconf netdev notifier requires that loopback_dev
4570 * has it's ipv6 private information allocated and setup
4571 * before it can bring up and give link-local addresses
4572 * to other devices which are up.
4573 *
4574 * Unfortunately, loopback_dev is not necessarily the first
4575 * entry in the global dev_base list of net devices. In fact,
4576 * it is likely to be the very last entry on that list.
4577 * So this causes the notifier registry below to try and
4578 * give link-local addresses to all devices besides loopback_dev
4579 * first, then loopback_dev, which cases all the non-loopback_dev
4580 * devices to fail to get a link-local address.
4581 *
4582 * So, as a temporary fix, allocate the ipv6 structure for
4583 * loopback_dev first by hand.
4584 * Longer term, all of the dependencies ipv6 has upon the loopback
4585 * device and it being up should be removed.
4586 */
4587 rtnl_lock();
4588 if (!ipv6_add_dev(init_net.loopback_dev))
4589 err = -ENOMEM;
4590 rtnl_unlock();
4591 if (err)
4592 goto errlo;
4593
4594 register_netdevice_notifier(&ipv6_dev_notf);
4595
4596 addrconf_verify(0);
4597
4598 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4599 if (err < 0)
4600 goto errout;
4601
4602 /* Only the first call to __rtnl_register can fail */
4603 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4604 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4605 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4606 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4607 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4608
4609 ipv6_addr_label_rtnl_register();
4610
4611 return 0;
4612 errout:
4613 unregister_netdevice_notifier(&ipv6_dev_notf);
4614 errlo:
4615 unregister_pernet_subsys(&addrconf_ops);
4616
4617 return err;
4618 }
4619
4620 void addrconf_cleanup(void)
4621 {
4622 struct inet6_ifaddr *ifa;
4623 struct net_device *dev;
4624 int i;
4625
4626 unregister_netdevice_notifier(&ipv6_dev_notf);
4627 unregister_pernet_subsys(&addrconf_ops);
4628
4629 rtnl_lock();
4630
4631 /* clean dev list */
4632 for_each_netdev(&init_net, dev) {
4633 if (__in6_dev_get(dev) == NULL)
4634 continue;
4635 addrconf_ifdown(dev, 1);
4636 }
4637 addrconf_ifdown(init_net.loopback_dev, 2);
4638
4639 /*
4640 * Check hash table.
4641 */
4642 write_lock_bh(&addrconf_hash_lock);
4643 for (i=0; i < IN6_ADDR_HSIZE; i++) {
4644 for (ifa=inet6_addr_lst[i]; ifa; ) {
4645 struct inet6_ifaddr *bifa;
4646
4647 bifa = ifa;
4648 ifa = ifa->lst_next;
4649 printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
4650 /* Do not free it; something is wrong.
4651 Now we can investigate it with debugger.
4652 */
4653 }
4654 }
4655 write_unlock_bh(&addrconf_hash_lock);
4656
4657 del_timer(&addr_chk_timer);
4658 rtnl_unlock();
4659 }
AMDTP streaming driver for the Linux FireWire stack (Juju)