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thinkpad-acpi: support the second fan on the X61
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / ipv6 / addrconf.c
blob1220e2c7831e106f7e2078d0c5ce497d0c69e4c7
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/socket.h>
44 #include <linux/sockios.h>
45 #include <linux/net.h>
46 #include <linux/in6.h>
47 #include <linux/netdevice.h>
48 #include <linux/if_addr.h>
49 #include <linux/if_arp.h>
50 #include <linux/if_arcnet.h>
51 #include <linux/if_infiniband.h>
52 #include <linux/route.h>
53 #include <linux/inetdevice.h>
54 #include <linux/init.h>
55 #ifdef CONFIG_SYSCTL
56 #include <linux/sysctl.h>
57 #endif
58 #include <linux/capability.h>
59 #include <linux/delay.h>
60 #include <linux/notifier.h>
61 #include <linux/string.h>
62
63 #include <net/net_namespace.h>
64 #include <net/sock.h>
65 #include <net/snmp.h>
66
67 #include <net/ipv6.h>
68 #include <net/protocol.h>
69 #include <net/ndisc.h>
70 #include <net/ip6_route.h>
71 #include <net/addrconf.h>
72 #include <net/tcp.h>
73 #include <net/ip.h>
74 #include <net/netlink.h>
75 #include <net/pkt_sched.h>
76 #include <linux/if_tunnel.h>
77 #include <linux/rtnetlink.h>
78
79 #ifdef CONFIG_IPV6_PRIVACY
80 #include <linux/random.h>
81 #endif
82
83 #include <asm/uaccess.h>
84 #include <asm/unaligned.h>
85
86 #include <linux/proc_fs.h>
87 #include <linux/seq_file.h>
88
89 /* Set to 3 to get tracing... */
90 #define ACONF_DEBUG 2
91
92 #if ACONF_DEBUG >= 3
93 #define ADBG(x) printk x
94 #else
95 #define ADBG(x)
96 #endif
97
98 #define INFINITY_LIFE_TIME 0xFFFFFFFF
99 #define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b)))
100
101 #ifdef CONFIG_SYSCTL
102 static void addrconf_sysctl_register(struct inet6_dev *idev);
103 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
104 #else
105 static inline void addrconf_sysctl_register(struct inet6_dev *idev)
106 {
107 }
108
109 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
110 {
111 }
112 #endif
113
114 #ifdef CONFIG_IPV6_PRIVACY
115 static int __ipv6_regen_rndid(struct inet6_dev *idev);
116 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
117 static void ipv6_regen_rndid(unsigned long data);
118
119 static int desync_factor = MAX_DESYNC_FACTOR * HZ;
120 #endif
121
122 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
123 static int ipv6_count_addresses(struct inet6_dev *idev);
124
125 /*
126 * Configured unicast address hash table
127 */
128 static struct inet6_ifaddr *inet6_addr_lst[IN6_ADDR_HSIZE];
129 static DEFINE_RWLOCK(addrconf_hash_lock);
130
131 static void addrconf_verify(unsigned long);
132
133 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
134 static DEFINE_SPINLOCK(addrconf_verify_lock);
135
136 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
137 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
138
139 static int addrconf_ifdown(struct net_device *dev, int how);
140
141 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
142 static void addrconf_dad_timer(unsigned long data);
143 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
144 static void addrconf_dad_run(struct inet6_dev *idev);
145 static void addrconf_rs_timer(unsigned long data);
146 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
147 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
148
149 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
150 struct prefix_info *pinfo);
151 static int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
152 struct net_device *dev);
153
154 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
155
156 static struct ipv6_devconf ipv6_devconf __read_mostly = {
157 .forwarding = 0,
158 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
159 .mtu6 = IPV6_MIN_MTU,
160 .accept_ra = 1,
161 .accept_redirects = 1,
162 .autoconf = 1,
163 .force_mld_version = 0,
164 .dad_transmits = 1,
165 .rtr_solicits = MAX_RTR_SOLICITATIONS,
166 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
167 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
168 #ifdef CONFIG_IPV6_PRIVACY
169 .use_tempaddr = 0,
170 .temp_valid_lft = TEMP_VALID_LIFETIME,
171 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
172 .regen_max_retry = REGEN_MAX_RETRY,
173 .max_desync_factor = MAX_DESYNC_FACTOR,
174 #endif
175 .max_addresses = IPV6_MAX_ADDRESSES,
176 .accept_ra_defrtr = 1,
177 .accept_ra_pinfo = 1,
178 #ifdef CONFIG_IPV6_ROUTER_PREF
179 .accept_ra_rtr_pref = 1,
180 .rtr_probe_interval = 60 * HZ,
181 #ifdef CONFIG_IPV6_ROUTE_INFO
182 .accept_ra_rt_info_max_plen = 0,
183 #endif
184 #endif
185 .proxy_ndp = 0,
186 .accept_source_route = 0, /* we do not accept RH0 by default. */
187 .disable_ipv6 = 0,
188 .accept_dad = 1,
189 };
190
191 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
192 .forwarding = 0,
193 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
194 .mtu6 = IPV6_MIN_MTU,
195 .accept_ra = 1,
196 .accept_redirects = 1,
197 .autoconf = 1,
198 .dad_transmits = 1,
199 .rtr_solicits = MAX_RTR_SOLICITATIONS,
200 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
201 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
202 #ifdef CONFIG_IPV6_PRIVACY
203 .use_tempaddr = 0,
204 .temp_valid_lft = TEMP_VALID_LIFETIME,
205 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
206 .regen_max_retry = REGEN_MAX_RETRY,
207 .max_desync_factor = MAX_DESYNC_FACTOR,
208 #endif
209 .max_addresses = IPV6_MAX_ADDRESSES,
210 .accept_ra_defrtr = 1,
211 .accept_ra_pinfo = 1,
212 #ifdef CONFIG_IPV6_ROUTER_PREF
213 .accept_ra_rtr_pref = 1,
214 .rtr_probe_interval = 60 * HZ,
215 #ifdef CONFIG_IPV6_ROUTE_INFO
216 .accept_ra_rt_info_max_plen = 0,
217 #endif
218 #endif
219 .proxy_ndp = 0,
220 .accept_source_route = 0, /* we do not accept RH0 by default. */
221 .disable_ipv6 = 0,
222 .accept_dad = 1,
223 };
224
225 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
226 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
227 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
228 const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
229 const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
230
231 /* Check if a valid qdisc is available */
232 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
233 {
234 return !qdisc_tx_is_noop(dev);
235 }
236
237 /* Check if a route is valid prefix route */
238 static inline int addrconf_is_prefix_route(const struct rt6_info *rt)
239 {
240 return ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0);
241 }
242
243 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
244 {
245 if (del_timer(&ifp->timer))
246 __in6_ifa_put(ifp);
247 }
248
249 enum addrconf_timer_t
250 {
251 AC_NONE,
252 AC_DAD,
253 AC_RS,
254 };
255
256 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
257 enum addrconf_timer_t what,
258 unsigned long when)
259 {
260 if (!del_timer(&ifp->timer))
261 in6_ifa_hold(ifp);
262
263 switch (what) {
264 case AC_DAD:
265 ifp->timer.function = addrconf_dad_timer;
266 break;
267 case AC_RS:
268 ifp->timer.function = addrconf_rs_timer;
269 break;
270 default:;
271 }
272 ifp->timer.expires = jiffies + when;
273 add_timer(&ifp->timer);
274 }
275
276 static int snmp6_alloc_dev(struct inet6_dev *idev)
277 {
278 if (snmp_mib_init((void **)idev->stats.ipv6,
279 sizeof(struct ipstats_mib)) < 0)
280 goto err_ip;
281 if (snmp_mib_init((void **)idev->stats.icmpv6,
282 sizeof(struct icmpv6_mib)) < 0)
283 goto err_icmp;
284 if (snmp_mib_init((void **)idev->stats.icmpv6msg,
285 sizeof(struct icmpv6msg_mib)) < 0)
286 goto err_icmpmsg;
287
288 return 0;
289
290 err_icmpmsg:
291 snmp_mib_free((void **)idev->stats.icmpv6);
292 err_icmp:
293 snmp_mib_free((void **)idev->stats.ipv6);
294 err_ip:
295 return -ENOMEM;
296 }
297
298 static void snmp6_free_dev(struct inet6_dev *idev)
299 {
300 snmp_mib_free((void **)idev->stats.icmpv6msg);
301 snmp_mib_free((void **)idev->stats.icmpv6);
302 snmp_mib_free((void **)idev->stats.ipv6);
303 }
304
305 /* Nobody refers to this device, we may destroy it. */
306
307 static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
308 {
309 struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
310 kfree(idev);
311 }
312
313 void in6_dev_finish_destroy(struct inet6_dev *idev)
314 {
315 struct net_device *dev = idev->dev;
316
317 WARN_ON(idev->addr_list != NULL);
318 WARN_ON(idev->mc_list != NULL);
319
320 #ifdef NET_REFCNT_DEBUG
321 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
322 #endif
323 dev_put(dev);
324 if (!idev->dead) {
325 printk("Freeing alive inet6 device %p\n", idev);
326 return;
327 }
328 snmp6_free_dev(idev);
329 call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
330 }
331
332 EXPORT_SYMBOL(in6_dev_finish_destroy);
333
334 static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
335 {
336 struct inet6_dev *ndev;
337
338 ASSERT_RTNL();
339
340 if (dev->mtu < IPV6_MIN_MTU)
341 return NULL;
342
343 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
344
345 if (ndev == NULL)
346 return NULL;
347
348 rwlock_init(&ndev->lock);
349 ndev->dev = dev;
350 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
351 ndev->cnf.mtu6 = dev->mtu;
352 ndev->cnf.sysctl = NULL;
353 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
354 if (ndev->nd_parms == NULL) {
355 kfree(ndev);
356 return NULL;
357 }
358 if (ndev->cnf.forwarding)
359 dev_disable_lro(dev);
360 /* We refer to the device */
361 dev_hold(dev);
362
363 if (snmp6_alloc_dev(ndev) < 0) {
364 ADBG((KERN_WARNING
365 "%s(): cannot allocate memory for statistics; dev=%s.\n",
366 __func__, dev->name));
367 neigh_parms_release(&nd_tbl, ndev->nd_parms);
368 ndev->dead = 1;
369 in6_dev_finish_destroy(ndev);
370 return NULL;
371 }
372
373 if (snmp6_register_dev(ndev) < 0) {
374 ADBG((KERN_WARNING
375 "%s(): cannot create /proc/net/dev_snmp6/%s\n",
376 __func__, dev->name));
377 neigh_parms_release(&nd_tbl, ndev->nd_parms);
378 ndev->dead = 1;
379 in6_dev_finish_destroy(ndev);
380 return NULL;
381 }
382
383 /* One reference from device. We must do this before
384 * we invoke __ipv6_regen_rndid().
385 */
386 in6_dev_hold(ndev);
387
388 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
389 ndev->cnf.accept_dad = -1;
390
391 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
392 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
393 printk(KERN_INFO
394 "%s: Disabled Multicast RS\n",
395 dev->name);
396 ndev->cnf.rtr_solicits = 0;
397 }
398 #endif
399
400 #ifdef CONFIG_IPV6_PRIVACY
401 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
402 if ((dev->flags&IFF_LOOPBACK) ||
403 dev->type == ARPHRD_TUNNEL ||
404 dev->type == ARPHRD_TUNNEL6 ||
405 dev->type == ARPHRD_SIT ||
406 dev->type == ARPHRD_NONE) {
407 printk(KERN_INFO
408 "%s: Disabled Privacy Extensions\n",
409 dev->name);
410 ndev->cnf.use_tempaddr = -1;
411 } else {
412 in6_dev_hold(ndev);
413 ipv6_regen_rndid((unsigned long) ndev);
414 }
415 #endif
416
417 if (netif_running(dev) && addrconf_qdisc_ok(dev))
418 ndev->if_flags |= IF_READY;
419
420 ipv6_mc_init_dev(ndev);
421 ndev->tstamp = jiffies;
422 addrconf_sysctl_register(ndev);
423 /* protected by rtnl_lock */
424 rcu_assign_pointer(dev->ip6_ptr, ndev);
425
426 /* Join all-node multicast group */
427 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
428
429 return ndev;
430 }
431
432 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
433 {
434 struct inet6_dev *idev;
435
436 ASSERT_RTNL();
437
438 if ((idev = __in6_dev_get(dev)) == NULL) {
439 if ((idev = ipv6_add_dev(dev)) == NULL)
440 return NULL;
441 }
442
443 if (dev->flags&IFF_UP)
444 ipv6_mc_up(idev);
445 return idev;
446 }
447
448 #ifdef CONFIG_SYSCTL
449 static void dev_forward_change(struct inet6_dev *idev)
450 {
451 struct net_device *dev;
452 struct inet6_ifaddr *ifa;
453
454 if (!idev)
455 return;
456 dev = idev->dev;
457 if (idev->cnf.forwarding)
458 dev_disable_lro(dev);
459 if (dev && (dev->flags & IFF_MULTICAST)) {
460 if (idev->cnf.forwarding)
461 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
462 else
463 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
464 }
465 for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
466 if (ifa->flags&IFA_F_TENTATIVE)
467 continue;
468 if (idev->cnf.forwarding)
469 addrconf_join_anycast(ifa);
470 else
471 addrconf_leave_anycast(ifa);
472 }
473 }
474
475
476 static void addrconf_forward_change(struct net *net, __s32 newf)
477 {
478 struct net_device *dev;
479 struct inet6_dev *idev;
480
481 read_lock(&dev_base_lock);
482 for_each_netdev(net, dev) {
483 rcu_read_lock();
484 idev = __in6_dev_get(dev);
485 if (idev) {
486 int changed = (!idev->cnf.forwarding) ^ (!newf);
487 idev->cnf.forwarding = newf;
488 if (changed)
489 dev_forward_change(idev);
490 }
491 rcu_read_unlock();
492 }
493 read_unlock(&dev_base_lock);
494 }
495
496 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old)
497 {
498 struct net *net;
499
500 net = (struct net *)table->extra2;
501 if (p == &net->ipv6.devconf_dflt->forwarding)
502 return 0;
503
504 if (!rtnl_trylock())
505 return -ERESTARTSYS;
506
507 if (p == &net->ipv6.devconf_all->forwarding) {
508 __s32 newf = net->ipv6.devconf_all->forwarding;
509 net->ipv6.devconf_dflt->forwarding = newf;
510 addrconf_forward_change(net, newf);
511 } else if ((!*p) ^ (!old))
512 dev_forward_change((struct inet6_dev *)table->extra1);
513 rtnl_unlock();
514
515 if (*p)
516 rt6_purge_dflt_routers(net);
517 return 1;
518 }
519 #endif
520
521 /* Nobody refers to this ifaddr, destroy it */
522
523 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
524 {
525 WARN_ON(ifp->if_next != NULL);
526 WARN_ON(ifp->lst_next != NULL);
527
528 #ifdef NET_REFCNT_DEBUG
529 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
530 #endif
531
532 in6_dev_put(ifp->idev);
533
534 if (del_timer(&ifp->timer))
535 printk("Timer is still running, when freeing ifa=%p\n", ifp);
536
537 if (!ifp->dead) {
538 printk("Freeing alive inet6 address %p\n", ifp);
539 return;
540 }
541 dst_release(&ifp->rt->u.dst);
542
543 kfree(ifp);
544 }
545
546 static void
547 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
548 {
549 struct inet6_ifaddr *ifa, **ifap;
550 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
551
552 /*
553 * Each device address list is sorted in order of scope -
554 * global before linklocal.
555 */
556 for (ifap = &idev->addr_list; (ifa = *ifap) != NULL;
557 ifap = &ifa->if_next) {
558 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
559 break;
560 }
561
562 ifp->if_next = *ifap;
563 *ifap = ifp;
564 }
565
566 /*
567 * Hash function taken from net_alias.c
568 */
569 static u8 ipv6_addr_hash(const struct in6_addr *addr)
570 {
571 __u32 word;
572
573 /*
574 * We perform the hash function over the last 64 bits of the address
575 * This will include the IEEE address token on links that support it.
576 */
577
578 word = (__force u32)(addr->s6_addr32[2] ^ addr->s6_addr32[3]);
579 word ^= (word >> 16);
580 word ^= (word >> 8);
581
582 return ((word ^ (word >> 4)) & 0x0f);
583 }
584
585 /* On success it returns ifp with increased reference count */
586
587 static struct inet6_ifaddr *
588 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
589 int scope, u32 flags)
590 {
591 struct inet6_ifaddr *ifa = NULL;
592 struct rt6_info *rt;
593 int hash;
594 int err = 0;
595 int addr_type = ipv6_addr_type(addr);
596
597 if (addr_type == IPV6_ADDR_ANY ||
598 addr_type & IPV6_ADDR_MULTICAST ||
599 (!(idev->dev->flags & IFF_LOOPBACK) &&
600 addr_type & IPV6_ADDR_LOOPBACK))
601 return ERR_PTR(-EADDRNOTAVAIL);
602
603 rcu_read_lock_bh();
604 if (idev->dead) {
605 err = -ENODEV; /*XXX*/
606 goto out2;
607 }
608
609 write_lock(&addrconf_hash_lock);
610
611 /* Ignore adding duplicate addresses on an interface */
612 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
613 ADBG(("ipv6_add_addr: already assigned\n"));
614 err = -EEXIST;
615 goto out;
616 }
617
618 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
619
620 if (ifa == NULL) {
621 ADBG(("ipv6_add_addr: malloc failed\n"));
622 err = -ENOBUFS;
623 goto out;
624 }
625
626 rt = addrconf_dst_alloc(idev, addr, 0);
627 if (IS_ERR(rt)) {
628 err = PTR_ERR(rt);
629 goto out;
630 }
631
632 ipv6_addr_copy(&ifa->addr, addr);
633
634 spin_lock_init(&ifa->lock);
635 init_timer(&ifa->timer);
636 ifa->timer.data = (unsigned long) ifa;
637 ifa->scope = scope;
638 ifa->prefix_len = pfxlen;
639 ifa->flags = flags | IFA_F_TENTATIVE;
640 ifa->cstamp = ifa->tstamp = jiffies;
641
642 ifa->rt = rt;
643
644 /*
645 * part one of RFC 4429, section 3.3
646 * We should not configure an address as
647 * optimistic if we do not yet know the link
648 * layer address of our nexhop router
649 */
650
651 if (rt->rt6i_nexthop == NULL)
652 ifa->flags &= ~IFA_F_OPTIMISTIC;
653
654 ifa->idev = idev;
655 in6_dev_hold(idev);
656 /* For caller */
657 in6_ifa_hold(ifa);
658
659 /* Add to big hash table */
660 hash = ipv6_addr_hash(addr);
661
662 ifa->lst_next = inet6_addr_lst[hash];
663 inet6_addr_lst[hash] = ifa;
664 in6_ifa_hold(ifa);
665 write_unlock(&addrconf_hash_lock);
666
667 write_lock(&idev->lock);
668 /* Add to inet6_dev unicast addr list. */
669 ipv6_link_dev_addr(idev, ifa);
670
671 #ifdef CONFIG_IPV6_PRIVACY
672 if (ifa->flags&IFA_F_TEMPORARY) {
673 ifa->tmp_next = idev->tempaddr_list;
674 idev->tempaddr_list = ifa;
675 in6_ifa_hold(ifa);
676 }
677 #endif
678
679 in6_ifa_hold(ifa);
680 write_unlock(&idev->lock);
681 out2:
682 rcu_read_unlock_bh();
683
684 if (likely(err == 0))
685 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
686 else {
687 kfree(ifa);
688 ifa = ERR_PTR(err);
689 }
690
691 return ifa;
692 out:
693 write_unlock(&addrconf_hash_lock);
694 goto out2;
695 }
696
697 /* This function wants to get referenced ifp and releases it before return */
698
699 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
700 {
701 struct inet6_ifaddr *ifa, **ifap;
702 struct inet6_dev *idev = ifp->idev;
703 int hash;
704 int deleted = 0, onlink = 0;
705 unsigned long expires = jiffies;
706
707 hash = ipv6_addr_hash(&ifp->addr);
708
709 ifp->dead = 1;
710
711 write_lock_bh(&addrconf_hash_lock);
712 for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
713 ifap = &ifa->lst_next) {
714 if (ifa == ifp) {
715 *ifap = ifa->lst_next;
716 __in6_ifa_put(ifp);
717 ifa->lst_next = NULL;
718 break;
719 }
720 }
721 write_unlock_bh(&addrconf_hash_lock);
722
723 write_lock_bh(&idev->lock);
724 #ifdef CONFIG_IPV6_PRIVACY
725 if (ifp->flags&IFA_F_TEMPORARY) {
726 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
727 ifap = &ifa->tmp_next) {
728 if (ifa == ifp) {
729 *ifap = ifa->tmp_next;
730 if (ifp->ifpub) {
731 in6_ifa_put(ifp->ifpub);
732 ifp->ifpub = NULL;
733 }
734 __in6_ifa_put(ifp);
735 ifa->tmp_next = NULL;
736 break;
737 }
738 }
739 }
740 #endif
741
742 for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
743 if (ifa == ifp) {
744 *ifap = ifa->if_next;
745 __in6_ifa_put(ifp);
746 ifa->if_next = NULL;
747 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
748 break;
749 deleted = 1;
750 continue;
751 } else if (ifp->flags & IFA_F_PERMANENT) {
752 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
753 ifp->prefix_len)) {
754 if (ifa->flags & IFA_F_PERMANENT) {
755 onlink = 1;
756 if (deleted)
757 break;
758 } else {
759 unsigned long lifetime;
760
761 if (!onlink)
762 onlink = -1;
763
764 spin_lock(&ifa->lock);
765
766 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
767 /*
768 * Note: Because this address is
769 * not permanent, lifetime <
770 * LONG_MAX / HZ here.
771 */
772 if (time_before(expires,
773 ifa->tstamp + lifetime * HZ))
774 expires = ifa->tstamp + lifetime * HZ;
775 spin_unlock(&ifa->lock);
776 }
777 }
778 }
779 ifap = &ifa->if_next;
780 }
781 write_unlock_bh(&idev->lock);
782
783 addrconf_del_timer(ifp);
784
785 ipv6_ifa_notify(RTM_DELADDR, ifp);
786
787 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
788
789 /*
790 * Purge or update corresponding prefix
791 *
792 * 1) we don't purge prefix here if address was not permanent.
793 * prefix is managed by its own lifetime.
794 * 2) if there're no addresses, delete prefix.
795 * 3) if there're still other permanent address(es),
796 * corresponding prefix is still permanent.
797 * 4) otherwise, update prefix lifetime to the
798 * longest valid lifetime among the corresponding
799 * addresses on the device.
800 * Note: subsequent RA will update lifetime.
801 *
802 * --yoshfuji
803 */
804 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
805 struct in6_addr prefix;
806 struct rt6_info *rt;
807 struct net *net = dev_net(ifp->idev->dev);
808 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
809 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1);
810
811 if (rt && addrconf_is_prefix_route(rt)) {
812 if (onlink == 0) {
813 ip6_del_rt(rt);
814 rt = NULL;
815 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
816 rt->rt6i_expires = expires;
817 rt->rt6i_flags |= RTF_EXPIRES;
818 }
819 }
820 dst_release(&rt->u.dst);
821 }
822
823 in6_ifa_put(ifp);
824 }
825
826 #ifdef CONFIG_IPV6_PRIVACY
827 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
828 {
829 struct inet6_dev *idev = ifp->idev;
830 struct in6_addr addr, *tmpaddr;
831 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
832 unsigned long regen_advance;
833 int tmp_plen;
834 int ret = 0;
835 int max_addresses;
836 u32 addr_flags;
837
838 write_lock(&idev->lock);
839 if (ift) {
840 spin_lock_bh(&ift->lock);
841 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
842 spin_unlock_bh(&ift->lock);
843 tmpaddr = &addr;
844 } else {
845 tmpaddr = NULL;
846 }
847 retry:
848 in6_dev_hold(idev);
849 if (idev->cnf.use_tempaddr <= 0) {
850 write_unlock(&idev->lock);
851 printk(KERN_INFO
852 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
853 in6_dev_put(idev);
854 ret = -1;
855 goto out;
856 }
857 spin_lock_bh(&ifp->lock);
858 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
859 idev->cnf.use_tempaddr = -1; /*XXX*/
860 spin_unlock_bh(&ifp->lock);
861 write_unlock(&idev->lock);
862 printk(KERN_WARNING
863 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
864 in6_dev_put(idev);
865 ret = -1;
866 goto out;
867 }
868 in6_ifa_hold(ifp);
869 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
870 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
871 spin_unlock_bh(&ifp->lock);
872 write_unlock(&idev->lock);
873 printk(KERN_WARNING
874 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
875 in6_ifa_put(ifp);
876 in6_dev_put(idev);
877 ret = -1;
878 goto out;
879 }
880 memcpy(&addr.s6_addr[8], idev->rndid, 8);
881 tmp_valid_lft = min_t(__u32,
882 ifp->valid_lft,
883 idev->cnf.temp_valid_lft);
884 tmp_prefered_lft = min_t(__u32,
885 ifp->prefered_lft,
886 idev->cnf.temp_prefered_lft - desync_factor / HZ);
887 tmp_plen = ifp->prefix_len;
888 max_addresses = idev->cnf.max_addresses;
889 tmp_cstamp = ifp->cstamp;
890 tmp_tstamp = ifp->tstamp;
891 spin_unlock_bh(&ifp->lock);
892
893 regen_advance = idev->cnf.regen_max_retry *
894 idev->cnf.dad_transmits *
895 idev->nd_parms->retrans_time / HZ;
896 write_unlock(&idev->lock);
897
898 /* A temporary address is created only if this calculated Preferred
899 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
900 * an implementation must not create a temporary address with a zero
901 * Preferred Lifetime.
902 */
903 if (tmp_prefered_lft <= regen_advance) {
904 in6_ifa_put(ifp);
905 in6_dev_put(idev);
906 ret = -1;
907 goto out;
908 }
909
910 addr_flags = IFA_F_TEMPORARY;
911 /* set in addrconf_prefix_rcv() */
912 if (ifp->flags & IFA_F_OPTIMISTIC)
913 addr_flags |= IFA_F_OPTIMISTIC;
914
915 ift = !max_addresses ||
916 ipv6_count_addresses(idev) < max_addresses ?
917 ipv6_add_addr(idev, &addr, tmp_plen,
918 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
919 addr_flags) : NULL;
920 if (!ift || IS_ERR(ift)) {
921 in6_ifa_put(ifp);
922 in6_dev_put(idev);
923 printk(KERN_INFO
924 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
925 tmpaddr = &addr;
926 write_lock(&idev->lock);
927 goto retry;
928 }
929
930 spin_lock_bh(&ift->lock);
931 ift->ifpub = ifp;
932 ift->valid_lft = tmp_valid_lft;
933 ift->prefered_lft = tmp_prefered_lft;
934 ift->cstamp = tmp_cstamp;
935 ift->tstamp = tmp_tstamp;
936 spin_unlock_bh(&ift->lock);
937
938 addrconf_dad_start(ift, 0);
939 in6_ifa_put(ift);
940 in6_dev_put(idev);
941 out:
942 return ret;
943 }
944 #endif
945
946 /*
947 * Choose an appropriate source address (RFC3484)
948 */
949 enum {
950 IPV6_SADDR_RULE_INIT = 0,
951 IPV6_SADDR_RULE_LOCAL,
952 IPV6_SADDR_RULE_SCOPE,
953 IPV6_SADDR_RULE_PREFERRED,
954 #ifdef CONFIG_IPV6_MIP6
955 IPV6_SADDR_RULE_HOA,
956 #endif
957 IPV6_SADDR_RULE_OIF,
958 IPV6_SADDR_RULE_LABEL,
959 #ifdef CONFIG_IPV6_PRIVACY
960 IPV6_SADDR_RULE_PRIVACY,
961 #endif
962 IPV6_SADDR_RULE_ORCHID,
963 IPV6_SADDR_RULE_PREFIX,
964 IPV6_SADDR_RULE_MAX
965 };
966
967 struct ipv6_saddr_score {
968 int rule;
969 int addr_type;
970 struct inet6_ifaddr *ifa;
971 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
972 int scopedist;
973 int matchlen;
974 };
975
976 struct ipv6_saddr_dst {
977 const struct in6_addr *addr;
978 int ifindex;
979 int scope;
980 int label;
981 unsigned int prefs;
982 };
983
984 static inline int ipv6_saddr_preferred(int type)
985 {
986 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
987 IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
988 return 1;
989 return 0;
990 }
991
992 static int ipv6_get_saddr_eval(struct net *net,
993 struct ipv6_saddr_score *score,
994 struct ipv6_saddr_dst *dst,
995 int i)
996 {
997 int ret;
998
999 if (i <= score->rule) {
1000 switch (i) {
1001 case IPV6_SADDR_RULE_SCOPE:
1002 ret = score->scopedist;
1003 break;
1004 case IPV6_SADDR_RULE_PREFIX:
1005 ret = score->matchlen;
1006 break;
1007 default:
1008 ret = !!test_bit(i, score->scorebits);
1009 }
1010 goto out;
1011 }
1012
1013 switch (i) {
1014 case IPV6_SADDR_RULE_INIT:
1015 /* Rule 0: remember if hiscore is not ready yet */
1016 ret = !!score->ifa;
1017 break;
1018 case IPV6_SADDR_RULE_LOCAL:
1019 /* Rule 1: Prefer same address */
1020 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1021 break;
1022 case IPV6_SADDR_RULE_SCOPE:
1023 /* Rule 2: Prefer appropriate scope
1024 *
1025 * ret
1026 * ^
1027 * -1 | d 15
1028 * ---+--+-+---> scope
1029 * |
1030 * | d is scope of the destination.
1031 * B-d | \
1032 * | \ <- smaller scope is better if
1033 * B-15 | \ if scope is enough for destinaion.
1034 * | ret = B - scope (-1 <= scope >= d <= 15).
1035 * d-C-1 | /
1036 * |/ <- greater is better
1037 * -C / if scope is not enough for destination.
1038 * /| ret = scope - C (-1 <= d < scope <= 15).
1039 *
1040 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1041 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1042 * Assume B = 0 and we get C > 29.
1043 */
1044 ret = __ipv6_addr_src_scope(score->addr_type);
1045 if (ret >= dst->scope)
1046 ret = -ret;
1047 else
1048 ret -= 128; /* 30 is enough */
1049 score->scopedist = ret;
1050 break;
1051 case IPV6_SADDR_RULE_PREFERRED:
1052 /* Rule 3: Avoid deprecated and optimistic addresses */
1053 ret = ipv6_saddr_preferred(score->addr_type) ||
1054 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1055 break;
1056 #ifdef CONFIG_IPV6_MIP6
1057 case IPV6_SADDR_RULE_HOA:
1058 {
1059 /* Rule 4: Prefer home address */
1060 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1061 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1062 break;
1063 }
1064 #endif
1065 case IPV6_SADDR_RULE_OIF:
1066 /* Rule 5: Prefer outgoing interface */
1067 ret = (!dst->ifindex ||
1068 dst->ifindex == score->ifa->idev->dev->ifindex);
1069 break;
1070 case IPV6_SADDR_RULE_LABEL:
1071 /* Rule 6: Prefer matching label */
1072 ret = ipv6_addr_label(net,
1073 &score->ifa->addr, score->addr_type,
1074 score->ifa->idev->dev->ifindex) == dst->label;
1075 break;
1076 #ifdef CONFIG_IPV6_PRIVACY
1077 case IPV6_SADDR_RULE_PRIVACY:
1078 {
1079 /* Rule 7: Prefer public address
1080 * Note: prefer temprary address if use_tempaddr >= 2
1081 */
1082 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1083 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1084 score->ifa->idev->cnf.use_tempaddr >= 2;
1085 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1086 break;
1087 }
1088 #endif
1089 case IPV6_SADDR_RULE_ORCHID:
1090 /* Rule 8-: Prefer ORCHID vs ORCHID or
1091 * non-ORCHID vs non-ORCHID
1092 */
1093 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1094 ipv6_addr_orchid(dst->addr));
1095 break;
1096 case IPV6_SADDR_RULE_PREFIX:
1097 /* Rule 8: Use longest matching prefix */
1098 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr,
1099 dst->addr);
1100 break;
1101 default:
1102 ret = 0;
1103 }
1104
1105 if (ret)
1106 __set_bit(i, score->scorebits);
1107 score->rule = i;
1108 out:
1109 return ret;
1110 }
1111
1112 int ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev,
1113 const struct in6_addr *daddr, unsigned int prefs,
1114 struct in6_addr *saddr)
1115 {
1116 struct ipv6_saddr_score scores[2],
1117 *score = &scores[0], *hiscore = &scores[1];
1118 struct ipv6_saddr_dst dst;
1119 struct net_device *dev;
1120 int dst_type;
1121
1122 dst_type = __ipv6_addr_type(daddr);
1123 dst.addr = daddr;
1124 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1125 dst.scope = __ipv6_addr_src_scope(dst_type);
1126 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1127 dst.prefs = prefs;
1128
1129 hiscore->rule = -1;
1130 hiscore->ifa = NULL;
1131
1132 read_lock(&dev_base_lock);
1133 rcu_read_lock();
1134
1135 for_each_netdev(net, dev) {
1136 struct inet6_dev *idev;
1137
1138 /* Candidate Source Address (section 4)
1139 * - multicast and link-local destination address,
1140 * the set of candidate source address MUST only
1141 * include addresses assigned to interfaces
1142 * belonging to the same link as the outgoing
1143 * interface.
1144 * (- For site-local destination addresses, the
1145 * set of candidate source addresses MUST only
1146 * include addresses assigned to interfaces
1147 * belonging to the same site as the outgoing
1148 * interface.)
1149 */
1150 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1151 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1152 dst.ifindex && dev->ifindex != dst.ifindex)
1153 continue;
1154
1155 idev = __in6_dev_get(dev);
1156 if (!idev)
1157 continue;
1158
1159 read_lock_bh(&idev->lock);
1160 for (score->ifa = idev->addr_list; score->ifa; score->ifa = score->ifa->if_next) {
1161 int i;
1162
1163 /*
1164 * - Tentative Address (RFC2462 section 5.4)
1165 * - A tentative address is not considered
1166 * "assigned to an interface" in the traditional
1167 * sense, unless it is also flagged as optimistic.
1168 * - Candidate Source Address (section 4)
1169 * - In any case, anycast addresses, multicast
1170 * addresses, and the unspecified address MUST
1171 * NOT be included in a candidate set.
1172 */
1173 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1174 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1175 continue;
1176
1177 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1178
1179 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1180 score->addr_type & IPV6_ADDR_MULTICAST)) {
1181 LIMIT_NETDEBUG(KERN_DEBUG
1182 "ADDRCONF: unspecified / multicast address "
1183 "assigned as unicast address on %s",
1184 dev->name);
1185 continue;
1186 }
1187
1188 score->rule = -1;
1189 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1190
1191 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1192 int minihiscore, miniscore;
1193
1194 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1195 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1196
1197 if (minihiscore > miniscore) {
1198 if (i == IPV6_SADDR_RULE_SCOPE &&
1199 score->scopedist > 0) {
1200 /*
1201 * special case:
1202 * each remaining entry
1203 * has too small (not enough)
1204 * scope, because ifa entries
1205 * are sorted by their scope
1206 * values.
1207 */
1208 goto try_nextdev;
1209 }
1210 break;
1211 } else if (minihiscore < miniscore) {
1212 struct ipv6_saddr_score *tmp;
1213
1214 if (hiscore->ifa)
1215 in6_ifa_put(hiscore->ifa);
1216
1217 in6_ifa_hold(score->ifa);
1218
1219 tmp = hiscore;
1220 hiscore = score;
1221 score = tmp;
1222
1223 /* restore our iterator */
1224 score->ifa = hiscore->ifa;
1225
1226 break;
1227 }
1228 }
1229 }
1230 try_nextdev:
1231 read_unlock_bh(&idev->lock);
1232 }
1233 rcu_read_unlock();
1234 read_unlock(&dev_base_lock);
1235
1236 if (!hiscore->ifa)
1237 return -EADDRNOTAVAIL;
1238
1239 ipv6_addr_copy(saddr, &hiscore->ifa->addr);
1240 in6_ifa_put(hiscore->ifa);
1241 return 0;
1242 }
1243
1244 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1245
1246 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1247 unsigned char banned_flags)
1248 {
1249 struct inet6_dev *idev;
1250 int err = -EADDRNOTAVAIL;
1251
1252 rcu_read_lock();
1253 if ((idev = __in6_dev_get(dev)) != NULL) {
1254 struct inet6_ifaddr *ifp;
1255
1256 read_lock_bh(&idev->lock);
1257 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1258 if (ifp->scope == IFA_LINK && !(ifp->flags & banned_flags)) {
1259 ipv6_addr_copy(addr, &ifp->addr);
1260 err = 0;
1261 break;
1262 }
1263 }
1264 read_unlock_bh(&idev->lock);
1265 }
1266 rcu_read_unlock();
1267 return err;
1268 }
1269
1270 static int ipv6_count_addresses(struct inet6_dev *idev)
1271 {
1272 int cnt = 0;
1273 struct inet6_ifaddr *ifp;
1274
1275 read_lock_bh(&idev->lock);
1276 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1277 cnt++;
1278 read_unlock_bh(&idev->lock);
1279 return cnt;
1280 }
1281
1282 int ipv6_chk_addr(struct net *net, struct in6_addr *addr,
1283 struct net_device *dev, int strict)
1284 {
1285 struct inet6_ifaddr * ifp;
1286 u8 hash = ipv6_addr_hash(addr);
1287
1288 read_lock_bh(&addrconf_hash_lock);
1289 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1290 if (!net_eq(dev_net(ifp->idev->dev), net))
1291 continue;
1292 if (ipv6_addr_equal(&ifp->addr, addr) &&
1293 !(ifp->flags&IFA_F_TENTATIVE)) {
1294 if (dev == NULL || ifp->idev->dev == dev ||
1295 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1296 break;
1297 }
1298 }
1299 read_unlock_bh(&addrconf_hash_lock);
1300 return ifp != NULL;
1301 }
1302 EXPORT_SYMBOL(ipv6_chk_addr);
1303
1304 static
1305 int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1306 struct net_device *dev)
1307 {
1308 struct inet6_ifaddr * ifp;
1309 u8 hash = ipv6_addr_hash(addr);
1310
1311 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1312 if (!net_eq(dev_net(ifp->idev->dev), net))
1313 continue;
1314 if (ipv6_addr_equal(&ifp->addr, addr)) {
1315 if (dev == NULL || ifp->idev->dev == dev)
1316 break;
1317 }
1318 }
1319 return ifp != NULL;
1320 }
1321
1322 int ipv6_chk_prefix(struct in6_addr *addr, struct net_device *dev)
1323 {
1324 struct inet6_dev *idev;
1325 struct inet6_ifaddr *ifa;
1326 int onlink;
1327
1328 onlink = 0;
1329 rcu_read_lock();
1330 idev = __in6_dev_get(dev);
1331 if (idev) {
1332 read_lock_bh(&idev->lock);
1333 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
1334 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1335 ifa->prefix_len);
1336 if (onlink)
1337 break;
1338 }
1339 read_unlock_bh(&idev->lock);
1340 }
1341 rcu_read_unlock();
1342 return onlink;
1343 }
1344
1345 EXPORT_SYMBOL(ipv6_chk_prefix);
1346
1347 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1348 struct net_device *dev, int strict)
1349 {
1350 struct inet6_ifaddr * ifp;
1351 u8 hash = ipv6_addr_hash(addr);
1352
1353 read_lock_bh(&addrconf_hash_lock);
1354 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1355 if (!net_eq(dev_net(ifp->idev->dev), net))
1356 continue;
1357 if (ipv6_addr_equal(&ifp->addr, addr)) {
1358 if (dev == NULL || ifp->idev->dev == dev ||
1359 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1360 in6_ifa_hold(ifp);
1361 break;
1362 }
1363 }
1364 }
1365 read_unlock_bh(&addrconf_hash_lock);
1366
1367 return ifp;
1368 }
1369
1370 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1371 {
1372 const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
1373 const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
1374 __be32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
1375 __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1376 int sk_ipv6only = ipv6_only_sock(sk);
1377 int sk2_ipv6only = inet_v6_ipv6only(sk2);
1378 int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1379 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1380
1381 if (!sk2_rcv_saddr && !sk_ipv6only)
1382 return 1;
1383
1384 if (addr_type2 == IPV6_ADDR_ANY &&
1385 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1386 return 1;
1387
1388 if (addr_type == IPV6_ADDR_ANY &&
1389 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1390 return 1;
1391
1392 if (sk2_rcv_saddr6 &&
1393 ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1394 return 1;
1395
1396 if (addr_type == IPV6_ADDR_MAPPED &&
1397 !sk2_ipv6only &&
1398 (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1399 return 1;
1400
1401 return 0;
1402 }
1403
1404 /* Gets referenced address, destroys ifaddr */
1405
1406 static void addrconf_dad_stop(struct inet6_ifaddr *ifp)
1407 {
1408 if (ifp->flags&IFA_F_PERMANENT) {
1409 spin_lock_bh(&ifp->lock);
1410 addrconf_del_timer(ifp);
1411 ifp->flags |= IFA_F_TENTATIVE;
1412 spin_unlock_bh(&ifp->lock);
1413 in6_ifa_put(ifp);
1414 #ifdef CONFIG_IPV6_PRIVACY
1415 } else if (ifp->flags&IFA_F_TEMPORARY) {
1416 struct inet6_ifaddr *ifpub;
1417 spin_lock_bh(&ifp->lock);
1418 ifpub = ifp->ifpub;
1419 if (ifpub) {
1420 in6_ifa_hold(ifpub);
1421 spin_unlock_bh(&ifp->lock);
1422 ipv6_create_tempaddr(ifpub, ifp);
1423 in6_ifa_put(ifpub);
1424 } else {
1425 spin_unlock_bh(&ifp->lock);
1426 }
1427 ipv6_del_addr(ifp);
1428 #endif
1429 } else
1430 ipv6_del_addr(ifp);
1431 }
1432
1433 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1434 {
1435 struct inet6_dev *idev = ifp->idev;
1436 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1437 struct in6_addr addr;
1438
1439 addr.s6_addr32[0] = htonl(0xfe800000);
1440 addr.s6_addr32[1] = 0;
1441
1442 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1443 ipv6_addr_equal(&ifp->addr, &addr)) {
1444 /* DAD failed for link-local based on MAC address */
1445 idev->cnf.disable_ipv6 = 1;
1446 }
1447 }
1448
1449 if (net_ratelimit())
1450 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1451 addrconf_dad_stop(ifp);
1452 }
1453
1454 /* Join to solicited addr multicast group. */
1455
1456 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1457 {
1458 struct in6_addr maddr;
1459
1460 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1461 return;
1462
1463 addrconf_addr_solict_mult(addr, &maddr);
1464 ipv6_dev_mc_inc(dev, &maddr);
1465 }
1466
1467 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1468 {
1469 struct in6_addr maddr;
1470
1471 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1472 return;
1473
1474 addrconf_addr_solict_mult(addr, &maddr);
1475 __ipv6_dev_mc_dec(idev, &maddr);
1476 }
1477
1478 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1479 {
1480 struct in6_addr addr;
1481 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1482 if (ipv6_addr_any(&addr))
1483 return;
1484 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1485 }
1486
1487 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1488 {
1489 struct in6_addr addr;
1490 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1491 if (ipv6_addr_any(&addr))
1492 return;
1493 __ipv6_dev_ac_dec(ifp->idev, &addr);
1494 }
1495
1496 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1497 {
1498 if (dev->addr_len != ETH_ALEN)
1499 return -1;
1500 memcpy(eui, dev->dev_addr, 3);
1501 memcpy(eui + 5, dev->dev_addr + 3, 3);
1502
1503 /*
1504 * The zSeries OSA network cards can be shared among various
1505 * OS instances, but the OSA cards have only one MAC address.
1506 * This leads to duplicate address conflicts in conjunction
1507 * with IPv6 if more than one instance uses the same card.
1508 *
1509 * The driver for these cards can deliver a unique 16-bit
1510 * identifier for each instance sharing the same card. It is
1511 * placed instead of 0xFFFE in the interface identifier. The
1512 * "u" bit of the interface identifier is not inverted in this
1513 * case. Hence the resulting interface identifier has local
1514 * scope according to RFC2373.
1515 */
1516 if (dev->dev_id) {
1517 eui[3] = (dev->dev_id >> 8) & 0xFF;
1518 eui[4] = dev->dev_id & 0xFF;
1519 } else {
1520 eui[3] = 0xFF;
1521 eui[4] = 0xFE;
1522 eui[0] ^= 2;
1523 }
1524 return 0;
1525 }
1526
1527 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1528 {
1529 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1530 if (dev->addr_len != ARCNET_ALEN)
1531 return -1;
1532 memset(eui, 0, 7);
1533 eui[7] = *(u8*)dev->dev_addr;
1534 return 0;
1535 }
1536
1537 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1538 {
1539 if (dev->addr_len != INFINIBAND_ALEN)
1540 return -1;
1541 memcpy(eui, dev->dev_addr + 12, 8);
1542 eui[0] |= 2;
1543 return 0;
1544 }
1545
1546 int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1547 {
1548 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1549 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1550 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1551 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1552 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1553 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1554 eui[1] = 0;
1555 eui[2] = 0x5E;
1556 eui[3] = 0xFE;
1557 memcpy(eui + 4, &addr, 4);
1558 return 0;
1559 }
1560 EXPORT_SYMBOL(__ipv6_isatap_ifid);
1561
1562 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1563 {
1564 if (dev->priv_flags & IFF_ISATAP)
1565 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1566 return -1;
1567 }
1568
1569 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1570 {
1571 switch (dev->type) {
1572 case ARPHRD_ETHER:
1573 case ARPHRD_FDDI:
1574 case ARPHRD_IEEE802_TR:
1575 return addrconf_ifid_eui48(eui, dev);
1576 case ARPHRD_ARCNET:
1577 return addrconf_ifid_arcnet(eui, dev);
1578 case ARPHRD_INFINIBAND:
1579 return addrconf_ifid_infiniband(eui, dev);
1580 case ARPHRD_SIT:
1581 return addrconf_ifid_sit(eui, dev);
1582 }
1583 return -1;
1584 }
1585
1586 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1587 {
1588 int err = -1;
1589 struct inet6_ifaddr *ifp;
1590
1591 read_lock_bh(&idev->lock);
1592 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1593 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1594 memcpy(eui, ifp->addr.s6_addr+8, 8);
1595 err = 0;
1596 break;
1597 }
1598 }
1599 read_unlock_bh(&idev->lock);
1600 return err;
1601 }
1602
1603 #ifdef CONFIG_IPV6_PRIVACY
1604 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1605 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1606 {
1607 regen:
1608 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1609 idev->rndid[0] &= ~0x02;
1610
1611 /*
1612 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1613 * check if generated address is not inappropriate
1614 *
1615 * - Reserved subnet anycast (RFC 2526)
1616 * 11111101 11....11 1xxxxxxx
1617 * - ISATAP (RFC4214) 6.1
1618 * 00-00-5E-FE-xx-xx-xx-xx
1619 * - value 0
1620 * - XXX: already assigned to an address on the device
1621 */
1622 if (idev->rndid[0] == 0xfd &&
1623 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1624 (idev->rndid[7]&0x80))
1625 goto regen;
1626 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1627 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1628 goto regen;
1629 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1630 goto regen;
1631 }
1632
1633 return 0;
1634 }
1635
1636 static void ipv6_regen_rndid(unsigned long data)
1637 {
1638 struct inet6_dev *idev = (struct inet6_dev *) data;
1639 unsigned long expires;
1640
1641 rcu_read_lock_bh();
1642 write_lock_bh(&idev->lock);
1643
1644 if (idev->dead)
1645 goto out;
1646
1647 if (__ipv6_regen_rndid(idev) < 0)
1648 goto out;
1649
1650 expires = jiffies +
1651 idev->cnf.temp_prefered_lft * HZ -
1652 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1653 if (time_before(expires, jiffies)) {
1654 printk(KERN_WARNING
1655 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1656 idev->dev->name);
1657 goto out;
1658 }
1659
1660 if (!mod_timer(&idev->regen_timer, expires))
1661 in6_dev_hold(idev);
1662
1663 out:
1664 write_unlock_bh(&idev->lock);
1665 rcu_read_unlock_bh();
1666 in6_dev_put(idev);
1667 }
1668
1669 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1670 int ret = 0;
1671
1672 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1673 ret = __ipv6_regen_rndid(idev);
1674 return ret;
1675 }
1676 #endif
1677
1678 /*
1679 * Add prefix route.
1680 */
1681
1682 static void
1683 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1684 unsigned long expires, u32 flags)
1685 {
1686 struct fib6_config cfg = {
1687 .fc_table = RT6_TABLE_PREFIX,
1688 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1689 .fc_ifindex = dev->ifindex,
1690 .fc_expires = expires,
1691 .fc_dst_len = plen,
1692 .fc_flags = RTF_UP | flags,
1693 .fc_nlinfo.nl_net = dev_net(dev),
1694 .fc_protocol = RTPROT_KERNEL,
1695 };
1696
1697 ipv6_addr_copy(&cfg.fc_dst, pfx);
1698
1699 /* Prevent useless cloning on PtP SIT.
1700 This thing is done here expecting that the whole
1701 class of non-broadcast devices need not cloning.
1702 */
1703 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1704 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1705 cfg.fc_flags |= RTF_NONEXTHOP;
1706 #endif
1707
1708 ip6_route_add(&cfg);
1709 }
1710
1711 /* Create "default" multicast route to the interface */
1712
1713 static void addrconf_add_mroute(struct net_device *dev)
1714 {
1715 struct fib6_config cfg = {
1716 .fc_table = RT6_TABLE_LOCAL,
1717 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1718 .fc_ifindex = dev->ifindex,
1719 .fc_dst_len = 8,
1720 .fc_flags = RTF_UP,
1721 .fc_nlinfo.nl_net = dev_net(dev),
1722 };
1723
1724 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1725
1726 ip6_route_add(&cfg);
1727 }
1728
1729 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1730 static void sit_route_add(struct net_device *dev)
1731 {
1732 struct fib6_config cfg = {
1733 .fc_table = RT6_TABLE_MAIN,
1734 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1735 .fc_ifindex = dev->ifindex,
1736 .fc_dst_len = 96,
1737 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1738 .fc_nlinfo.nl_net = dev_net(dev),
1739 };
1740
1741 /* prefix length - 96 bits "::d.d.d.d" */
1742 ip6_route_add(&cfg);
1743 }
1744 #endif
1745
1746 static void addrconf_add_lroute(struct net_device *dev)
1747 {
1748 struct in6_addr addr;
1749
1750 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1751 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1752 }
1753
1754 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1755 {
1756 struct inet6_dev *idev;
1757
1758 ASSERT_RTNL();
1759
1760 if ((idev = ipv6_find_idev(dev)) == NULL)
1761 return NULL;
1762
1763 /* Add default multicast route */
1764 addrconf_add_mroute(dev);
1765
1766 /* Add link local route */
1767 addrconf_add_lroute(dev);
1768 return idev;
1769 }
1770
1771 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1772 {
1773 struct prefix_info *pinfo;
1774 __u32 valid_lft;
1775 __u32 prefered_lft;
1776 int addr_type;
1777 struct inet6_dev *in6_dev;
1778
1779 pinfo = (struct prefix_info *) opt;
1780
1781 if (len < sizeof(struct prefix_info)) {
1782 ADBG(("addrconf: prefix option too short\n"));
1783 return;
1784 }
1785
1786 /*
1787 * Validation checks ([ADDRCONF], page 19)
1788 */
1789
1790 addr_type = ipv6_addr_type(&pinfo->prefix);
1791
1792 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1793 return;
1794
1795 valid_lft = ntohl(pinfo->valid);
1796 prefered_lft = ntohl(pinfo->prefered);
1797
1798 if (prefered_lft > valid_lft) {
1799 if (net_ratelimit())
1800 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1801 return;
1802 }
1803
1804 in6_dev = in6_dev_get(dev);
1805
1806 if (in6_dev == NULL) {
1807 if (net_ratelimit())
1808 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1809 return;
1810 }
1811
1812 /*
1813 * Two things going on here:
1814 * 1) Add routes for on-link prefixes
1815 * 2) Configure prefixes with the auto flag set
1816 */
1817
1818 if (pinfo->onlink) {
1819 struct rt6_info *rt;
1820 unsigned long rt_expires;
1821
1822 /* Avoid arithmetic overflow. Really, we could
1823 * save rt_expires in seconds, likely valid_lft,
1824 * but it would require division in fib gc, that it
1825 * not good.
1826 */
1827 if (HZ > USER_HZ)
1828 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
1829 else
1830 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
1831
1832 if (addrconf_finite_timeout(rt_expires))
1833 rt_expires *= HZ;
1834
1835 rt = rt6_lookup(dev_net(dev), &pinfo->prefix, NULL,
1836 dev->ifindex, 1);
1837
1838 if (rt && addrconf_is_prefix_route(rt)) {
1839 /* Autoconf prefix route */
1840 if (valid_lft == 0) {
1841 ip6_del_rt(rt);
1842 rt = NULL;
1843 } else if (addrconf_finite_timeout(rt_expires)) {
1844 /* not infinity */
1845 rt->rt6i_expires = jiffies + rt_expires;
1846 rt->rt6i_flags |= RTF_EXPIRES;
1847 } else {
1848 rt->rt6i_flags &= ~RTF_EXPIRES;
1849 rt->rt6i_expires = 0;
1850 }
1851 } else if (valid_lft) {
1852 clock_t expires = 0;
1853 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
1854 if (addrconf_finite_timeout(rt_expires)) {
1855 /* not infinity */
1856 flags |= RTF_EXPIRES;
1857 expires = jiffies_to_clock_t(rt_expires);
1858 }
1859 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1860 dev, expires, flags);
1861 }
1862 if (rt)
1863 dst_release(&rt->u.dst);
1864 }
1865
1866 /* Try to figure out our local address for this prefix */
1867
1868 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1869 struct inet6_ifaddr * ifp;
1870 struct in6_addr addr;
1871 int create = 0, update_lft = 0;
1872 struct net *net = dev_net(dev);
1873
1874 if (pinfo->prefix_len == 64) {
1875 memcpy(&addr, &pinfo->prefix, 8);
1876 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1877 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1878 in6_dev_put(in6_dev);
1879 return;
1880 }
1881 goto ok;
1882 }
1883 if (net_ratelimit())
1884 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1885 pinfo->prefix_len);
1886 in6_dev_put(in6_dev);
1887 return;
1888
1889 ok:
1890
1891 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1892
1893 if (ifp == NULL && valid_lft) {
1894 int max_addresses = in6_dev->cnf.max_addresses;
1895 u32 addr_flags = 0;
1896
1897 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1898 if (in6_dev->cnf.optimistic_dad &&
1899 !net->ipv6.devconf_all->forwarding)
1900 addr_flags = IFA_F_OPTIMISTIC;
1901 #endif
1902
1903 /* Do not allow to create too much of autoconfigured
1904 * addresses; this would be too easy way to crash kernel.
1905 */
1906 if (!max_addresses ||
1907 ipv6_count_addresses(in6_dev) < max_addresses)
1908 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1909 addr_type&IPV6_ADDR_SCOPE_MASK,
1910 addr_flags);
1911
1912 if (!ifp || IS_ERR(ifp)) {
1913 in6_dev_put(in6_dev);
1914 return;
1915 }
1916
1917 update_lft = create = 1;
1918 ifp->cstamp = jiffies;
1919 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1920 }
1921
1922 if (ifp) {
1923 int flags;
1924 unsigned long now;
1925 #ifdef CONFIG_IPV6_PRIVACY
1926 struct inet6_ifaddr *ift;
1927 #endif
1928 u32 stored_lft;
1929
1930 /* update lifetime (RFC2462 5.5.3 e) */
1931 spin_lock(&ifp->lock);
1932 now = jiffies;
1933 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1934 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1935 else
1936 stored_lft = 0;
1937 if (!update_lft && stored_lft) {
1938 if (valid_lft > MIN_VALID_LIFETIME ||
1939 valid_lft > stored_lft)
1940 update_lft = 1;
1941 else if (stored_lft <= MIN_VALID_LIFETIME) {
1942 /* valid_lft <= stored_lft is always true */
1943 /* XXX: IPsec */
1944 update_lft = 0;
1945 } else {
1946 valid_lft = MIN_VALID_LIFETIME;
1947 if (valid_lft < prefered_lft)
1948 prefered_lft = valid_lft;
1949 update_lft = 1;
1950 }
1951 }
1952
1953 if (update_lft) {
1954 ifp->valid_lft = valid_lft;
1955 ifp->prefered_lft = prefered_lft;
1956 ifp->tstamp = now;
1957 flags = ifp->flags;
1958 ifp->flags &= ~IFA_F_DEPRECATED;
1959 spin_unlock(&ifp->lock);
1960
1961 if (!(flags&IFA_F_TENTATIVE))
1962 ipv6_ifa_notify(0, ifp);
1963 } else
1964 spin_unlock(&ifp->lock);
1965
1966 #ifdef CONFIG_IPV6_PRIVACY
1967 read_lock_bh(&in6_dev->lock);
1968 /* update all temporary addresses in the list */
1969 for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1970 /*
1971 * When adjusting the lifetimes of an existing
1972 * temporary address, only lower the lifetimes.
1973 * Implementations must not increase the
1974 * lifetimes of an existing temporary address
1975 * when processing a Prefix Information Option.
1976 */
1977 if (ifp != ift->ifpub)
1978 continue;
1979
1980 spin_lock(&ift->lock);
1981 flags = ift->flags;
1982 if (ift->valid_lft > valid_lft &&
1983 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1984 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1985 if (ift->prefered_lft > prefered_lft &&
1986 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1987 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1988 spin_unlock(&ift->lock);
1989 if (!(flags&IFA_F_TENTATIVE))
1990 ipv6_ifa_notify(0, ift);
1991 }
1992
1993 if (create && in6_dev->cnf.use_tempaddr > 0) {
1994 /*
1995 * When a new public address is created as described in [ADDRCONF],
1996 * also create a new temporary address.
1997 */
1998 read_unlock_bh(&in6_dev->lock);
1999 ipv6_create_tempaddr(ifp, NULL);
2000 } else {
2001 read_unlock_bh(&in6_dev->lock);
2002 }
2003 #endif
2004 in6_ifa_put(ifp);
2005 addrconf_verify(0);
2006 }
2007 }
2008 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2009 in6_dev_put(in6_dev);
2010 }
2011
2012 /*
2013 * Set destination address.
2014 * Special case for SIT interfaces where we create a new "virtual"
2015 * device.
2016 */
2017 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2018 {
2019 struct in6_ifreq ireq;
2020 struct net_device *dev;
2021 int err = -EINVAL;
2022
2023 rtnl_lock();
2024
2025 err = -EFAULT;
2026 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2027 goto err_exit;
2028
2029 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2030
2031 err = -ENODEV;
2032 if (dev == NULL)
2033 goto err_exit;
2034
2035 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2036 if (dev->type == ARPHRD_SIT) {
2037 const struct net_device_ops *ops = dev->netdev_ops;
2038 struct ifreq ifr;
2039 struct ip_tunnel_parm p;
2040
2041 err = -EADDRNOTAVAIL;
2042 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2043 goto err_exit;
2044
2045 memset(&p, 0, sizeof(p));
2046 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2047 p.iph.saddr = 0;
2048 p.iph.version = 4;
2049 p.iph.ihl = 5;
2050 p.iph.protocol = IPPROTO_IPV6;
2051 p.iph.ttl = 64;
2052 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2053
2054 if (ops->ndo_do_ioctl) {
2055 mm_segment_t oldfs = get_fs();
2056
2057 set_fs(KERNEL_DS);
2058 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2059 set_fs(oldfs);
2060 } else
2061 err = -EOPNOTSUPP;
2062
2063 if (err == 0) {
2064 err = -ENOBUFS;
2065 dev = __dev_get_by_name(net, p.name);
2066 if (!dev)
2067 goto err_exit;
2068 err = dev_open(dev);
2069 }
2070 }
2071 #endif
2072
2073 err_exit:
2074 rtnl_unlock();
2075 return err;
2076 }
2077
2078 /*
2079 * Manual configuration of address on an interface
2080 */
2081 static int inet6_addr_add(struct net *net, int ifindex, struct in6_addr *pfx,
2082 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
2083 __u32 valid_lft)
2084 {
2085 struct inet6_ifaddr *ifp;
2086 struct inet6_dev *idev;
2087 struct net_device *dev;
2088 int scope;
2089 u32 flags;
2090 clock_t expires;
2091 unsigned long timeout;
2092
2093 ASSERT_RTNL();
2094
2095 if (plen > 128)
2096 return -EINVAL;
2097
2098 /* check the lifetime */
2099 if (!valid_lft || prefered_lft > valid_lft)
2100 return -EINVAL;
2101
2102 dev = __dev_get_by_index(net, ifindex);
2103 if (!dev)
2104 return -ENODEV;
2105
2106 if ((idev = addrconf_add_dev(dev)) == NULL)
2107 return -ENOBUFS;
2108
2109 scope = ipv6_addr_scope(pfx);
2110
2111 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2112 if (addrconf_finite_timeout(timeout)) {
2113 expires = jiffies_to_clock_t(timeout * HZ);
2114 valid_lft = timeout;
2115 flags = RTF_EXPIRES;
2116 } else {
2117 expires = 0;
2118 flags = 0;
2119 ifa_flags |= IFA_F_PERMANENT;
2120 }
2121
2122 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2123 if (addrconf_finite_timeout(timeout)) {
2124 if (timeout == 0)
2125 ifa_flags |= IFA_F_DEPRECATED;
2126 prefered_lft = timeout;
2127 }
2128
2129 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2130
2131 if (!IS_ERR(ifp)) {
2132 spin_lock_bh(&ifp->lock);
2133 ifp->valid_lft = valid_lft;
2134 ifp->prefered_lft = prefered_lft;
2135 ifp->tstamp = jiffies;
2136 spin_unlock_bh(&ifp->lock);
2137
2138 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2139 expires, flags);
2140 /*
2141 * Note that section 3.1 of RFC 4429 indicates
2142 * that the Optimistic flag should not be set for
2143 * manually configured addresses
2144 */
2145 addrconf_dad_start(ifp, 0);
2146 in6_ifa_put(ifp);
2147 addrconf_verify(0);
2148 return 0;
2149 }
2150
2151 return PTR_ERR(ifp);
2152 }
2153
2154 static int inet6_addr_del(struct net *net, int ifindex, struct in6_addr *pfx,
2155 unsigned int plen)
2156 {
2157 struct inet6_ifaddr *ifp;
2158 struct inet6_dev *idev;
2159 struct net_device *dev;
2160
2161 if (plen > 128)
2162 return -EINVAL;
2163
2164 dev = __dev_get_by_index(net, ifindex);
2165 if (!dev)
2166 return -ENODEV;
2167
2168 if ((idev = __in6_dev_get(dev)) == NULL)
2169 return -ENXIO;
2170
2171 read_lock_bh(&idev->lock);
2172 for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
2173 if (ifp->prefix_len == plen &&
2174 ipv6_addr_equal(pfx, &ifp->addr)) {
2175 in6_ifa_hold(ifp);
2176 read_unlock_bh(&idev->lock);
2177
2178 ipv6_del_addr(ifp);
2179
2180 /* If the last address is deleted administratively,
2181 disable IPv6 on this interface.
2182 */
2183 if (idev->addr_list == NULL)
2184 addrconf_ifdown(idev->dev, 1);
2185 return 0;
2186 }
2187 }
2188 read_unlock_bh(&idev->lock);
2189 return -EADDRNOTAVAIL;
2190 }
2191
2192
2193 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2194 {
2195 struct in6_ifreq ireq;
2196 int err;
2197
2198 if (!capable(CAP_NET_ADMIN))
2199 return -EPERM;
2200
2201 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2202 return -EFAULT;
2203
2204 rtnl_lock();
2205 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2206 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2207 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2208 rtnl_unlock();
2209 return err;
2210 }
2211
2212 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2213 {
2214 struct in6_ifreq ireq;
2215 int err;
2216
2217 if (!capable(CAP_NET_ADMIN))
2218 return -EPERM;
2219
2220 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2221 return -EFAULT;
2222
2223 rtnl_lock();
2224 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2225 ireq.ifr6_prefixlen);
2226 rtnl_unlock();
2227 return err;
2228 }
2229
2230 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2231 static void sit_add_v4_addrs(struct inet6_dev *idev)
2232 {
2233 struct inet6_ifaddr * ifp;
2234 struct in6_addr addr;
2235 struct net_device *dev;
2236 struct net *net = dev_net(idev->dev);
2237 int scope;
2238
2239 ASSERT_RTNL();
2240
2241 memset(&addr, 0, sizeof(struct in6_addr));
2242 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2243
2244 if (idev->dev->flags&IFF_POINTOPOINT) {
2245 addr.s6_addr32[0] = htonl(0xfe800000);
2246 scope = IFA_LINK;
2247 } else {
2248 scope = IPV6_ADDR_COMPATv4;
2249 }
2250
2251 if (addr.s6_addr32[3]) {
2252 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
2253 if (!IS_ERR(ifp)) {
2254 spin_lock_bh(&ifp->lock);
2255 ifp->flags &= ~IFA_F_TENTATIVE;
2256 spin_unlock_bh(&ifp->lock);
2257 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2258 in6_ifa_put(ifp);
2259 }
2260 return;
2261 }
2262
2263 for_each_netdev(net, dev) {
2264 struct in_device * in_dev = __in_dev_get_rtnl(dev);
2265 if (in_dev && (dev->flags & IFF_UP)) {
2266 struct in_ifaddr * ifa;
2267
2268 int flag = scope;
2269
2270 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2271 int plen;
2272
2273 addr.s6_addr32[3] = ifa->ifa_local;
2274
2275 if (ifa->ifa_scope == RT_SCOPE_LINK)
2276 continue;
2277 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2278 if (idev->dev->flags&IFF_POINTOPOINT)
2279 continue;
2280 flag |= IFA_HOST;
2281 }
2282 if (idev->dev->flags&IFF_POINTOPOINT)
2283 plen = 64;
2284 else
2285 plen = 96;
2286
2287 ifp = ipv6_add_addr(idev, &addr, plen, flag,
2288 IFA_F_PERMANENT);
2289 if (!IS_ERR(ifp)) {
2290 spin_lock_bh(&ifp->lock);
2291 ifp->flags &= ~IFA_F_TENTATIVE;
2292 spin_unlock_bh(&ifp->lock);
2293 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2294 in6_ifa_put(ifp);
2295 }
2296 }
2297 }
2298 }
2299 }
2300 #endif
2301
2302 static void init_loopback(struct net_device *dev)
2303 {
2304 struct inet6_dev *idev;
2305 struct inet6_ifaddr * ifp;
2306
2307 /* ::1 */
2308
2309 ASSERT_RTNL();
2310
2311 if ((idev = ipv6_find_idev(dev)) == NULL) {
2312 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2313 return;
2314 }
2315
2316 ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
2317 if (!IS_ERR(ifp)) {
2318 spin_lock_bh(&ifp->lock);
2319 ifp->flags &= ~IFA_F_TENTATIVE;
2320 spin_unlock_bh(&ifp->lock);
2321 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2322 in6_ifa_put(ifp);
2323 }
2324 }
2325
2326 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2327 {
2328 struct inet6_ifaddr * ifp;
2329 u32 addr_flags = IFA_F_PERMANENT;
2330
2331 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2332 if (idev->cnf.optimistic_dad &&
2333 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2334 addr_flags |= IFA_F_OPTIMISTIC;
2335 #endif
2336
2337
2338 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2339 if (!IS_ERR(ifp)) {
2340 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2341 addrconf_dad_start(ifp, 0);
2342 in6_ifa_put(ifp);
2343 }
2344 }
2345
2346 static void addrconf_dev_config(struct net_device *dev)
2347 {
2348 struct in6_addr addr;
2349 struct inet6_dev * idev;
2350
2351 ASSERT_RTNL();
2352
2353 if ((dev->type != ARPHRD_ETHER) &&
2354 (dev->type != ARPHRD_FDDI) &&
2355 (dev->type != ARPHRD_IEEE802_TR) &&
2356 (dev->type != ARPHRD_ARCNET) &&
2357 (dev->type != ARPHRD_INFINIBAND)) {
2358 /* Alas, we support only Ethernet autoconfiguration. */
2359 return;
2360 }
2361
2362 idev = addrconf_add_dev(dev);
2363 if (idev == NULL)
2364 return;
2365
2366 memset(&addr, 0, sizeof(struct in6_addr));
2367 addr.s6_addr32[0] = htonl(0xFE800000);
2368
2369 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2370 addrconf_add_linklocal(idev, &addr);
2371 }
2372
2373 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2374 static void addrconf_sit_config(struct net_device *dev)
2375 {
2376 struct inet6_dev *idev;
2377
2378 ASSERT_RTNL();
2379
2380 /*
2381 * Configure the tunnel with one of our IPv4
2382 * addresses... we should configure all of
2383 * our v4 addrs in the tunnel
2384 */
2385
2386 if ((idev = ipv6_find_idev(dev)) == NULL) {
2387 printk(KERN_DEBUG "init sit: add_dev failed\n");
2388 return;
2389 }
2390
2391 if (dev->priv_flags & IFF_ISATAP) {
2392 struct in6_addr addr;
2393
2394 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2395 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2396 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2397 addrconf_add_linklocal(idev, &addr);
2398 return;
2399 }
2400
2401 sit_add_v4_addrs(idev);
2402
2403 if (dev->flags&IFF_POINTOPOINT) {
2404 addrconf_add_mroute(dev);
2405 addrconf_add_lroute(dev);
2406 } else
2407 sit_route_add(dev);
2408 }
2409 #endif
2410
2411 static inline int
2412 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2413 {
2414 struct in6_addr lladdr;
2415
2416 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2417 addrconf_add_linklocal(idev, &lladdr);
2418 return 0;
2419 }
2420 return -1;
2421 }
2422
2423 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2424 {
2425 struct net_device *link_dev;
2426 struct net *net = dev_net(idev->dev);
2427
2428 /* first try to inherit the link-local address from the link device */
2429 if (idev->dev->iflink &&
2430 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
2431 if (!ipv6_inherit_linklocal(idev, link_dev))
2432 return;
2433 }
2434 /* then try to inherit it from any device */
2435 for_each_netdev(net, link_dev) {
2436 if (!ipv6_inherit_linklocal(idev, link_dev))
2437 return;
2438 }
2439 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2440 }
2441
2442 /*
2443 * Autoconfigure tunnel with a link-local address so routing protocols,
2444 * DHCPv6, MLD etc. can be run over the virtual link
2445 */
2446
2447 static void addrconf_ip6_tnl_config(struct net_device *dev)
2448 {
2449 struct inet6_dev *idev;
2450
2451 ASSERT_RTNL();
2452
2453 if ((idev = addrconf_add_dev(dev)) == NULL) {
2454 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2455 return;
2456 }
2457 ip6_tnl_add_linklocal(idev);
2458 }
2459
2460 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2461 void * data)
2462 {
2463 struct net_device *dev = (struct net_device *) data;
2464 struct inet6_dev *idev = __in6_dev_get(dev);
2465 int run_pending = 0;
2466 int err;
2467
2468 switch(event) {
2469 case NETDEV_REGISTER:
2470 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2471 idev = ipv6_add_dev(dev);
2472 if (!idev)
2473 return notifier_from_errno(-ENOMEM);
2474 }
2475 break;
2476 case NETDEV_UP:
2477 case NETDEV_CHANGE:
2478 if (dev->flags & IFF_SLAVE)
2479 break;
2480
2481 if (event == NETDEV_UP) {
2482 if (!addrconf_qdisc_ok(dev)) {
2483 /* device is not ready yet. */
2484 printk(KERN_INFO
2485 "ADDRCONF(NETDEV_UP): %s: "
2486 "link is not ready\n",
2487 dev->name);
2488 break;
2489 }
2490
2491 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2492 idev = ipv6_add_dev(dev);
2493
2494 if (idev) {
2495 idev->if_flags |= IF_READY;
2496 run_pending = 1;
2497 }
2498 } else {
2499 if (!addrconf_qdisc_ok(dev)) {
2500 /* device is still not ready. */
2501 break;
2502 }
2503
2504 if (idev) {
2505 if (idev->if_flags & IF_READY) {
2506 /* device is already configured. */
2507 break;
2508 }
2509 idev->if_flags |= IF_READY;
2510 }
2511
2512 printk(KERN_INFO
2513 "ADDRCONF(NETDEV_CHANGE): %s: "
2514 "link becomes ready\n",
2515 dev->name);
2516
2517 run_pending = 1;
2518 }
2519
2520 switch(dev->type) {
2521 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2522 case ARPHRD_SIT:
2523 addrconf_sit_config(dev);
2524 break;
2525 #endif
2526 case ARPHRD_TUNNEL6:
2527 addrconf_ip6_tnl_config(dev);
2528 break;
2529 case ARPHRD_LOOPBACK:
2530 init_loopback(dev);
2531 break;
2532
2533 default:
2534 addrconf_dev_config(dev);
2535 break;
2536 }
2537 if (idev) {
2538 if (run_pending)
2539 addrconf_dad_run(idev);
2540
2541 /* If the MTU changed during the interface down, when the
2542 interface up, the changed MTU must be reflected in the
2543 idev as well as routers.
2544 */
2545 if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2546 rt6_mtu_change(dev, dev->mtu);
2547 idev->cnf.mtu6 = dev->mtu;
2548 }
2549 idev->tstamp = jiffies;
2550 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2551 /* If the changed mtu during down is lower than IPV6_MIN_MTU
2552 stop IPv6 on this interface.
2553 */
2554 if (dev->mtu < IPV6_MIN_MTU)
2555 addrconf_ifdown(dev, event != NETDEV_DOWN);
2556 }
2557 break;
2558
2559 case NETDEV_CHANGEMTU:
2560 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2561 rt6_mtu_change(dev, dev->mtu);
2562 idev->cnf.mtu6 = dev->mtu;
2563 break;
2564 }
2565
2566 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2567 idev = ipv6_add_dev(dev);
2568 if (idev)
2569 break;
2570 }
2571
2572 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2573
2574 case NETDEV_DOWN:
2575 case NETDEV_UNREGISTER:
2576 /*
2577 * Remove all addresses from this interface.
2578 */
2579 addrconf_ifdown(dev, event != NETDEV_DOWN);
2580 break;
2581
2582 case NETDEV_CHANGENAME:
2583 if (idev) {
2584 snmp6_unregister_dev(idev);
2585 addrconf_sysctl_unregister(idev);
2586 addrconf_sysctl_register(idev);
2587 err = snmp6_register_dev(idev);
2588 if (err)
2589 return notifier_from_errno(err);
2590 }
2591 break;
2592 }
2593
2594 return NOTIFY_OK;
2595 }
2596
2597 /*
2598 * addrconf module should be notified of a device going up
2599 */
2600 static struct notifier_block ipv6_dev_notf = {
2601 .notifier_call = addrconf_notify,
2602 .priority = 0
2603 };
2604
2605 static int addrconf_ifdown(struct net_device *dev, int how)
2606 {
2607 struct inet6_dev *idev;
2608 struct inet6_ifaddr *ifa, **bifa;
2609 struct net *net = dev_net(dev);
2610 int i;
2611
2612 ASSERT_RTNL();
2613
2614 rt6_ifdown(net, dev);
2615 neigh_ifdown(&nd_tbl, dev);
2616
2617 idev = __in6_dev_get(dev);
2618 if (idev == NULL)
2619 return -ENODEV;
2620
2621 /* Step 1: remove reference to ipv6 device from parent device.
2622 Do not dev_put!
2623 */
2624 if (how) {
2625 idev->dead = 1;
2626
2627 /* protected by rtnl_lock */
2628 rcu_assign_pointer(dev->ip6_ptr, NULL);
2629
2630 /* Step 1.5: remove snmp6 entry */
2631 snmp6_unregister_dev(idev);
2632
2633 }
2634
2635 /* Step 2: clear hash table */
2636 for (i=0; i<IN6_ADDR_HSIZE; i++) {
2637 bifa = &inet6_addr_lst[i];
2638
2639 write_lock_bh(&addrconf_hash_lock);
2640 while ((ifa = *bifa) != NULL) {
2641 if (ifa->idev == idev) {
2642 *bifa = ifa->lst_next;
2643 ifa->lst_next = NULL;
2644 addrconf_del_timer(ifa);
2645 in6_ifa_put(ifa);
2646 continue;
2647 }
2648 bifa = &ifa->lst_next;
2649 }
2650 write_unlock_bh(&addrconf_hash_lock);
2651 }
2652
2653 write_lock_bh(&idev->lock);
2654
2655 /* Step 3: clear flags for stateless addrconf */
2656 if (!how)
2657 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2658
2659 /* Step 4: clear address list */
2660 #ifdef CONFIG_IPV6_PRIVACY
2661 if (how && del_timer(&idev->regen_timer))
2662 in6_dev_put(idev);
2663
2664 /* clear tempaddr list */
2665 while ((ifa = idev->tempaddr_list) != NULL) {
2666 idev->tempaddr_list = ifa->tmp_next;
2667 ifa->tmp_next = NULL;
2668 ifa->dead = 1;
2669 write_unlock_bh(&idev->lock);
2670 spin_lock_bh(&ifa->lock);
2671
2672 if (ifa->ifpub) {
2673 in6_ifa_put(ifa->ifpub);
2674 ifa->ifpub = NULL;
2675 }
2676 spin_unlock_bh(&ifa->lock);
2677 in6_ifa_put(ifa);
2678 write_lock_bh(&idev->lock);
2679 }
2680 #endif
2681 while ((ifa = idev->addr_list) != NULL) {
2682 idev->addr_list = ifa->if_next;
2683 ifa->if_next = NULL;
2684 ifa->dead = 1;
2685 addrconf_del_timer(ifa);
2686 write_unlock_bh(&idev->lock);
2687
2688 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2689 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2690 in6_ifa_put(ifa);
2691
2692 write_lock_bh(&idev->lock);
2693 }
2694 write_unlock_bh(&idev->lock);
2695
2696 /* Step 5: Discard multicast list */
2697
2698 if (how)
2699 ipv6_mc_destroy_dev(idev);
2700 else
2701 ipv6_mc_down(idev);
2702
2703 idev->tstamp = jiffies;
2704
2705 /* Shot the device (if unregistered) */
2706
2707 if (how) {
2708 addrconf_sysctl_unregister(idev);
2709 neigh_parms_release(&nd_tbl, idev->nd_parms);
2710 neigh_ifdown(&nd_tbl, dev);
2711 in6_dev_put(idev);
2712 }
2713 return 0;
2714 }
2715
2716 static void addrconf_rs_timer(unsigned long data)
2717 {
2718 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2719
2720 if (ifp->idev->cnf.forwarding)
2721 goto out;
2722
2723 if (ifp->idev->if_flags & IF_RA_RCVD) {
2724 /*
2725 * Announcement received after solicitation
2726 * was sent
2727 */
2728 goto out;
2729 }
2730
2731 spin_lock(&ifp->lock);
2732 if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2733 /* The wait after the last probe can be shorter */
2734 addrconf_mod_timer(ifp, AC_RS,
2735 (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2736 ifp->idev->cnf.rtr_solicit_delay :
2737 ifp->idev->cnf.rtr_solicit_interval);
2738 spin_unlock(&ifp->lock);
2739
2740 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2741 } else {
2742 spin_unlock(&ifp->lock);
2743 /*
2744 * Note: we do not support deprecated "all on-link"
2745 * assumption any longer.
2746 */
2747 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2748 ifp->idev->dev->name);
2749 }
2750
2751 out:
2752 in6_ifa_put(ifp);
2753 }
2754
2755 /*
2756 * Duplicate Address Detection
2757 */
2758 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2759 {
2760 unsigned long rand_num;
2761 struct inet6_dev *idev = ifp->idev;
2762
2763 if (ifp->flags & IFA_F_OPTIMISTIC)
2764 rand_num = 0;
2765 else
2766 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2767
2768 ifp->probes = idev->cnf.dad_transmits;
2769 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2770 }
2771
2772 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2773 {
2774 struct inet6_dev *idev = ifp->idev;
2775 struct net_device *dev = idev->dev;
2776
2777 addrconf_join_solict(dev, &ifp->addr);
2778
2779 net_srandom(ifp->addr.s6_addr32[3]);
2780
2781 read_lock_bh(&idev->lock);
2782 if (ifp->dead)
2783 goto out;
2784 spin_lock_bh(&ifp->lock);
2785
2786 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2787 idev->cnf.accept_dad < 1 ||
2788 !(ifp->flags&IFA_F_TENTATIVE) ||
2789 ifp->flags & IFA_F_NODAD) {
2790 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
2791 spin_unlock_bh(&ifp->lock);
2792 read_unlock_bh(&idev->lock);
2793
2794 addrconf_dad_completed(ifp);
2795 return;
2796 }
2797
2798 if (!(idev->if_flags & IF_READY)) {
2799 spin_unlock_bh(&ifp->lock);
2800 read_unlock_bh(&idev->lock);
2801 /*
2802 * If the defice is not ready:
2803 * - keep it tentative if it is a permanent address.
2804 * - otherwise, kill it.
2805 */
2806 in6_ifa_hold(ifp);
2807 addrconf_dad_stop(ifp);
2808 return;
2809 }
2810
2811 /*
2812 * Optimistic nodes can start receiving
2813 * Frames right away
2814 */
2815 if(ifp->flags & IFA_F_OPTIMISTIC)
2816 ip6_ins_rt(ifp->rt);
2817
2818 addrconf_dad_kick(ifp);
2819 spin_unlock_bh(&ifp->lock);
2820 out:
2821 read_unlock_bh(&idev->lock);
2822 }
2823
2824 static void addrconf_dad_timer(unsigned long data)
2825 {
2826 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2827 struct inet6_dev *idev = ifp->idev;
2828 struct in6_addr mcaddr;
2829
2830 read_lock_bh(&idev->lock);
2831 if (idev->dead) {
2832 read_unlock_bh(&idev->lock);
2833 goto out;
2834 }
2835 if (idev->cnf.accept_dad > 1 && idev->cnf.disable_ipv6) {
2836 read_unlock_bh(&idev->lock);
2837 addrconf_dad_failure(ifp);
2838 return;
2839 }
2840 spin_lock_bh(&ifp->lock);
2841 if (ifp->probes == 0) {
2842 /*
2843 * DAD was successful
2844 */
2845
2846 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
2847 spin_unlock_bh(&ifp->lock);
2848 read_unlock_bh(&idev->lock);
2849
2850 addrconf_dad_completed(ifp);
2851
2852 goto out;
2853 }
2854
2855 ifp->probes--;
2856 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2857 spin_unlock_bh(&ifp->lock);
2858 read_unlock_bh(&idev->lock);
2859
2860 /* send a neighbour solicitation for our addr */
2861 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2862 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
2863 out:
2864 in6_ifa_put(ifp);
2865 }
2866
2867 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2868 {
2869 struct net_device * dev = ifp->idev->dev;
2870
2871 /*
2872 * Configure the address for reception. Now it is valid.
2873 */
2874
2875 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2876
2877 /* If added prefix is link local and forwarding is off,
2878 start sending router solicitations.
2879 */
2880
2881 if (ifp->idev->cnf.forwarding == 0 &&
2882 ifp->idev->cnf.rtr_solicits > 0 &&
2883 (dev->flags&IFF_LOOPBACK) == 0 &&
2884 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2885 /*
2886 * If a host as already performed a random delay
2887 * [...] as part of DAD [...] there is no need
2888 * to delay again before sending the first RS
2889 */
2890 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2891
2892 spin_lock_bh(&ifp->lock);
2893 ifp->probes = 1;
2894 ifp->idev->if_flags |= IF_RS_SENT;
2895 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2896 spin_unlock_bh(&ifp->lock);
2897 }
2898 }
2899
2900 static void addrconf_dad_run(struct inet6_dev *idev) {
2901 struct inet6_ifaddr *ifp;
2902
2903 read_lock_bh(&idev->lock);
2904 for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2905 spin_lock_bh(&ifp->lock);
2906 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2907 spin_unlock_bh(&ifp->lock);
2908 continue;
2909 }
2910 spin_unlock_bh(&ifp->lock);
2911 addrconf_dad_kick(ifp);
2912 }
2913 read_unlock_bh(&idev->lock);
2914 }
2915
2916 #ifdef CONFIG_PROC_FS
2917 struct if6_iter_state {
2918 struct seq_net_private p;
2919 int bucket;
2920 };
2921
2922 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2923 {
2924 struct inet6_ifaddr *ifa = NULL;
2925 struct if6_iter_state *state = seq->private;
2926 struct net *net = seq_file_net(seq);
2927
2928 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2929 ifa = inet6_addr_lst[state->bucket];
2930
2931 while (ifa && !net_eq(dev_net(ifa->idev->dev), net))
2932 ifa = ifa->lst_next;
2933 if (ifa)
2934 break;
2935 }
2936 return ifa;
2937 }
2938
2939 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2940 {
2941 struct if6_iter_state *state = seq->private;
2942 struct net *net = seq_file_net(seq);
2943
2944 ifa = ifa->lst_next;
2945 try_again:
2946 if (ifa) {
2947 if (!net_eq(dev_net(ifa->idev->dev), net)) {
2948 ifa = ifa->lst_next;
2949 goto try_again;
2950 }
2951 }
2952
2953 if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2954 ifa = inet6_addr_lst[state->bucket];
2955 goto try_again;
2956 }
2957
2958 return ifa;
2959 }
2960
2961 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2962 {
2963 struct inet6_ifaddr *ifa = if6_get_first(seq);
2964
2965 if (ifa)
2966 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2967 --pos;
2968 return pos ? NULL : ifa;
2969 }
2970
2971 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2972 __acquires(addrconf_hash_lock)
2973 {
2974 read_lock_bh(&addrconf_hash_lock);
2975 return if6_get_idx(seq, *pos);
2976 }
2977
2978 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2979 {
2980 struct inet6_ifaddr *ifa;
2981
2982 ifa = if6_get_next(seq, v);
2983 ++*pos;
2984 return ifa;
2985 }
2986
2987 static void if6_seq_stop(struct seq_file *seq, void *v)
2988 __releases(addrconf_hash_lock)
2989 {
2990 read_unlock_bh(&addrconf_hash_lock);
2991 }
2992
2993 static int if6_seq_show(struct seq_file *seq, void *v)
2994 {
2995 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2996 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
2997 &ifp->addr,
2998 ifp->idev->dev->ifindex,
2999 ifp->prefix_len,
3000 ifp->scope,
3001 ifp->flags,
3002 ifp->idev->dev->name);
3003 return 0;
3004 }
3005
3006 static const struct seq_operations if6_seq_ops = {
3007 .start = if6_seq_start,
3008 .next = if6_seq_next,
3009 .show = if6_seq_show,
3010 .stop = if6_seq_stop,
3011 };
3012
3013 static int if6_seq_open(struct inode *inode, struct file *file)
3014 {
3015 return seq_open_net(inode, file, &if6_seq_ops,
3016 sizeof(struct if6_iter_state));
3017 }
3018
3019 static const struct file_operations if6_fops = {
3020 .owner = THIS_MODULE,
3021 .open = if6_seq_open,
3022 .read = seq_read,
3023 .llseek = seq_lseek,
3024 .release = seq_release_net,
3025 };
3026
3027 static int if6_proc_net_init(struct net *net)
3028 {
3029 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
3030 return -ENOMEM;
3031 return 0;
3032 }
3033
3034 static void if6_proc_net_exit(struct net *net)
3035 {
3036 proc_net_remove(net, "if_inet6");
3037 }
3038
3039 static struct pernet_operations if6_proc_net_ops = {
3040 .init = if6_proc_net_init,
3041 .exit = if6_proc_net_exit,
3042 };
3043
3044 int __init if6_proc_init(void)
3045 {
3046 return register_pernet_subsys(&if6_proc_net_ops);
3047 }
3048
3049 void if6_proc_exit(void)
3050 {
3051 unregister_pernet_subsys(&if6_proc_net_ops);
3052 }
3053 #endif /* CONFIG_PROC_FS */
3054
3055 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3056 /* Check if address is a home address configured on any interface. */
3057 int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr)
3058 {
3059 int ret = 0;
3060 struct inet6_ifaddr * ifp;
3061 u8 hash = ipv6_addr_hash(addr);
3062 read_lock_bh(&addrconf_hash_lock);
3063 for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) {
3064 if (!net_eq(dev_net(ifp->idev->dev), net))
3065 continue;
3066 if (ipv6_addr_equal(&ifp->addr, addr) &&
3067 (ifp->flags & IFA_F_HOMEADDRESS)) {
3068 ret = 1;
3069 break;
3070 }
3071 }
3072 read_unlock_bh(&addrconf_hash_lock);
3073 return ret;
3074 }
3075 #endif
3076
3077 /*
3078 * Periodic address status verification
3079 */
3080
3081 static void addrconf_verify(unsigned long foo)
3082 {
3083 struct inet6_ifaddr *ifp;
3084 unsigned long now, next;
3085 int i;
3086
3087 spin_lock_bh(&addrconf_verify_lock);
3088 now = jiffies;
3089 next = now + ADDR_CHECK_FREQUENCY;
3090
3091 del_timer(&addr_chk_timer);
3092
3093 for (i=0; i < IN6_ADDR_HSIZE; i++) {
3094
3095 restart:
3096 read_lock(&addrconf_hash_lock);
3097 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
3098 unsigned long age;
3099 #ifdef CONFIG_IPV6_PRIVACY
3100 unsigned long regen_advance;
3101 #endif
3102
3103 if (ifp->flags & IFA_F_PERMANENT)
3104 continue;
3105
3106 spin_lock(&ifp->lock);
3107 age = (now - ifp->tstamp) / HZ;
3108
3109 #ifdef CONFIG_IPV6_PRIVACY
3110 regen_advance = ifp->idev->cnf.regen_max_retry *
3111 ifp->idev->cnf.dad_transmits *
3112 ifp->idev->nd_parms->retrans_time / HZ;
3113 #endif
3114
3115 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3116 age >= ifp->valid_lft) {
3117 spin_unlock(&ifp->lock);
3118 in6_ifa_hold(ifp);
3119 read_unlock(&addrconf_hash_lock);
3120 ipv6_del_addr(ifp);
3121 goto restart;
3122 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3123 spin_unlock(&ifp->lock);
3124 continue;
3125 } else if (age >= ifp->prefered_lft) {
3126 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
3127 int deprecate = 0;
3128
3129 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3130 deprecate = 1;
3131 ifp->flags |= IFA_F_DEPRECATED;
3132 }
3133
3134 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3135 next = ifp->tstamp + ifp->valid_lft * HZ;
3136
3137 spin_unlock(&ifp->lock);
3138
3139 if (deprecate) {
3140 in6_ifa_hold(ifp);
3141 read_unlock(&addrconf_hash_lock);
3142
3143 ipv6_ifa_notify(0, ifp);
3144 in6_ifa_put(ifp);
3145 goto restart;
3146 }
3147 #ifdef CONFIG_IPV6_PRIVACY
3148 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3149 !(ifp->flags&IFA_F_TENTATIVE)) {
3150 if (age >= ifp->prefered_lft - regen_advance) {
3151 struct inet6_ifaddr *ifpub = ifp->ifpub;
3152 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3153 next = ifp->tstamp + ifp->prefered_lft * HZ;
3154 if (!ifp->regen_count && ifpub) {
3155 ifp->regen_count++;
3156 in6_ifa_hold(ifp);
3157 in6_ifa_hold(ifpub);
3158 spin_unlock(&ifp->lock);
3159 read_unlock(&addrconf_hash_lock);
3160 spin_lock(&ifpub->lock);
3161 ifpub->regen_count = 0;
3162 spin_unlock(&ifpub->lock);
3163 ipv6_create_tempaddr(ifpub, ifp);
3164 in6_ifa_put(ifpub);
3165 in6_ifa_put(ifp);
3166 goto restart;
3167 }
3168 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3169 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3170 spin_unlock(&ifp->lock);
3171 #endif
3172 } else {
3173 /* ifp->prefered_lft <= ifp->valid_lft */
3174 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3175 next = ifp->tstamp + ifp->prefered_lft * HZ;
3176 spin_unlock(&ifp->lock);
3177 }
3178 }
3179 read_unlock(&addrconf_hash_lock);
3180 }
3181
3182 addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
3183 add_timer(&addr_chk_timer);
3184 spin_unlock_bh(&addrconf_verify_lock);
3185 }
3186
3187 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3188 {
3189 struct in6_addr *pfx = NULL;
3190
3191 if (addr)
3192 pfx = nla_data(addr);
3193
3194 if (local) {
3195 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3196 pfx = NULL;
3197 else
3198 pfx = nla_data(local);
3199 }
3200
3201 return pfx;
3202 }
3203
3204 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3205 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3206 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3207 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3208 };
3209
3210 static int
3211 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3212 {
3213 struct net *net = sock_net(skb->sk);
3214 struct ifaddrmsg *ifm;
3215 struct nlattr *tb[IFA_MAX+1];
3216 struct in6_addr *pfx;
3217 int err;
3218
3219 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3220 if (err < 0)
3221 return err;
3222
3223 ifm = nlmsg_data(nlh);
3224 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3225 if (pfx == NULL)
3226 return -EINVAL;
3227
3228 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3229 }
3230
3231 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3232 u32 prefered_lft, u32 valid_lft)
3233 {
3234 u32 flags;
3235 clock_t expires;
3236 unsigned long timeout;
3237
3238 if (!valid_lft || (prefered_lft > valid_lft))
3239 return -EINVAL;
3240
3241 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3242 if (addrconf_finite_timeout(timeout)) {
3243 expires = jiffies_to_clock_t(timeout * HZ);
3244 valid_lft = timeout;
3245 flags = RTF_EXPIRES;
3246 } else {
3247 expires = 0;
3248 flags = 0;
3249 ifa_flags |= IFA_F_PERMANENT;
3250 }
3251
3252 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3253 if (addrconf_finite_timeout(timeout)) {
3254 if (timeout == 0)
3255 ifa_flags |= IFA_F_DEPRECATED;
3256 prefered_lft = timeout;
3257 }
3258
3259 spin_lock_bh(&ifp->lock);
3260 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3261 ifp->tstamp = jiffies;
3262 ifp->valid_lft = valid_lft;
3263 ifp->prefered_lft = prefered_lft;
3264
3265 spin_unlock_bh(&ifp->lock);
3266 if (!(ifp->flags&IFA_F_TENTATIVE))
3267 ipv6_ifa_notify(0, ifp);
3268
3269 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3270 expires, flags);
3271 addrconf_verify(0);
3272
3273 return 0;
3274 }
3275
3276 static int
3277 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3278 {
3279 struct net *net = sock_net(skb->sk);
3280 struct ifaddrmsg *ifm;
3281 struct nlattr *tb[IFA_MAX+1];
3282 struct in6_addr *pfx;
3283 struct inet6_ifaddr *ifa;
3284 struct net_device *dev;
3285 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3286 u8 ifa_flags;
3287 int err;
3288
3289 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3290 if (err < 0)
3291 return err;
3292
3293 ifm = nlmsg_data(nlh);
3294 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3295 if (pfx == NULL)
3296 return -EINVAL;
3297
3298 if (tb[IFA_CACHEINFO]) {
3299 struct ifa_cacheinfo *ci;
3300
3301 ci = nla_data(tb[IFA_CACHEINFO]);
3302 valid_lft = ci->ifa_valid;
3303 preferred_lft = ci->ifa_prefered;
3304 } else {
3305 preferred_lft = INFINITY_LIFE_TIME;
3306 valid_lft = INFINITY_LIFE_TIME;
3307 }
3308
3309 dev = __dev_get_by_index(net, ifm->ifa_index);
3310 if (dev == NULL)
3311 return -ENODEV;
3312
3313 /* We ignore other flags so far. */
3314 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3315
3316 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3317 if (ifa == NULL) {
3318 /*
3319 * It would be best to check for !NLM_F_CREATE here but
3320 * userspace alreay relies on not having to provide this.
3321 */
3322 return inet6_addr_add(net, ifm->ifa_index, pfx,
3323 ifm->ifa_prefixlen, ifa_flags,
3324 preferred_lft, valid_lft);
3325 }
3326
3327 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3328 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3329 err = -EEXIST;
3330 else
3331 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3332
3333 in6_ifa_put(ifa);
3334
3335 return err;
3336 }
3337
3338 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3339 u8 scope, int ifindex)
3340 {
3341 struct ifaddrmsg *ifm;
3342
3343 ifm = nlmsg_data(nlh);
3344 ifm->ifa_family = AF_INET6;
3345 ifm->ifa_prefixlen = prefixlen;
3346 ifm->ifa_flags = flags;
3347 ifm->ifa_scope = scope;
3348 ifm->ifa_index = ifindex;
3349 }
3350
3351 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3352 unsigned long tstamp, u32 preferred, u32 valid)
3353 {
3354 struct ifa_cacheinfo ci;
3355
3356 ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3357 + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3358 ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3359 + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3360 ci.ifa_prefered = preferred;
3361 ci.ifa_valid = valid;
3362
3363 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3364 }
3365
3366 static inline int rt_scope(int ifa_scope)
3367 {
3368 if (ifa_scope & IFA_HOST)
3369 return RT_SCOPE_HOST;
3370 else if (ifa_scope & IFA_LINK)
3371 return RT_SCOPE_LINK;
3372 else if (ifa_scope & IFA_SITE)
3373 return RT_SCOPE_SITE;
3374 else
3375 return RT_SCOPE_UNIVERSE;
3376 }
3377
3378 static inline int inet6_ifaddr_msgsize(void)
3379 {
3380 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3381 + nla_total_size(16) /* IFA_ADDRESS */
3382 + nla_total_size(sizeof(struct ifa_cacheinfo));
3383 }
3384
3385 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3386 u32 pid, u32 seq, int event, unsigned int flags)
3387 {
3388 struct nlmsghdr *nlh;
3389 u32 preferred, valid;
3390
3391 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3392 if (nlh == NULL)
3393 return -EMSGSIZE;
3394
3395 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3396 ifa->idev->dev->ifindex);
3397
3398 if (!(ifa->flags&IFA_F_PERMANENT)) {
3399 preferred = ifa->prefered_lft;
3400 valid = ifa->valid_lft;
3401 if (preferred != INFINITY_LIFE_TIME) {
3402 long tval = (jiffies - ifa->tstamp)/HZ;
3403 preferred -= tval;
3404 if (valid != INFINITY_LIFE_TIME)
3405 valid -= tval;
3406 }
3407 } else {
3408 preferred = INFINITY_LIFE_TIME;
3409 valid = INFINITY_LIFE_TIME;
3410 }
3411
3412 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3413 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3414 nlmsg_cancel(skb, nlh);
3415 return -EMSGSIZE;
3416 }
3417
3418 return nlmsg_end(skb, nlh);
3419 }
3420
3421 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3422 u32 pid, u32 seq, int event, u16 flags)
3423 {
3424 struct nlmsghdr *nlh;
3425 u8 scope = RT_SCOPE_UNIVERSE;
3426 int ifindex = ifmca->idev->dev->ifindex;
3427
3428 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3429 scope = RT_SCOPE_SITE;
3430
3431 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3432 if (nlh == NULL)
3433 return -EMSGSIZE;
3434
3435 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3436 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3437 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3438 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3439 nlmsg_cancel(skb, nlh);
3440 return -EMSGSIZE;
3441 }
3442
3443 return nlmsg_end(skb, nlh);
3444 }
3445
3446 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3447 u32 pid, u32 seq, int event, unsigned int flags)
3448 {
3449 struct nlmsghdr *nlh;
3450 u8 scope = RT_SCOPE_UNIVERSE;
3451 int ifindex = ifaca->aca_idev->dev->ifindex;
3452
3453 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3454 scope = RT_SCOPE_SITE;
3455
3456 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3457 if (nlh == NULL)
3458 return -EMSGSIZE;
3459
3460 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3461 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3462 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3463 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3464 nlmsg_cancel(skb, nlh);
3465 return -EMSGSIZE;
3466 }
3467
3468 return nlmsg_end(skb, nlh);
3469 }
3470
3471 enum addr_type_t
3472 {
3473 UNICAST_ADDR,
3474 MULTICAST_ADDR,
3475 ANYCAST_ADDR,
3476 };
3477
3478 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3479 enum addr_type_t type)
3480 {
3481 int idx, ip_idx;
3482 int s_idx, s_ip_idx;
3483 int err = 1;
3484 struct net_device *dev;
3485 struct inet6_dev *idev = NULL;
3486 struct inet6_ifaddr *ifa;
3487 struct ifmcaddr6 *ifmca;
3488 struct ifacaddr6 *ifaca;
3489 struct net *net = sock_net(skb->sk);
3490
3491 s_idx = cb->args[0];
3492 s_ip_idx = ip_idx = cb->args[1];
3493
3494 idx = 0;
3495 for_each_netdev(net, dev) {
3496 if (idx < s_idx)
3497 goto cont;
3498 if (idx > s_idx)
3499 s_ip_idx = 0;
3500 ip_idx = 0;
3501 if ((idev = in6_dev_get(dev)) == NULL)
3502 goto cont;
3503 read_lock_bh(&idev->lock);
3504 switch (type) {
3505 case UNICAST_ADDR:
3506 /* unicast address incl. temp addr */
3507 for (ifa = idev->addr_list; ifa;
3508 ifa = ifa->if_next, ip_idx++) {
3509 if (ip_idx < s_ip_idx)
3510 continue;
3511 err = inet6_fill_ifaddr(skb, ifa,
3512 NETLINK_CB(cb->skb).pid,
3513 cb->nlh->nlmsg_seq,
3514 RTM_NEWADDR,
3515 NLM_F_MULTI);
3516 }
3517 break;
3518 case MULTICAST_ADDR:
3519 /* multicast address */
3520 for (ifmca = idev->mc_list; ifmca;
3521 ifmca = ifmca->next, ip_idx++) {
3522 if (ip_idx < s_ip_idx)
3523 continue;
3524 err = inet6_fill_ifmcaddr(skb, ifmca,
3525 NETLINK_CB(cb->skb).pid,
3526 cb->nlh->nlmsg_seq,
3527 RTM_GETMULTICAST,
3528 NLM_F_MULTI);
3529 }
3530 break;
3531 case ANYCAST_ADDR:
3532 /* anycast address */
3533 for (ifaca = idev->ac_list; ifaca;
3534 ifaca = ifaca->aca_next, ip_idx++) {
3535 if (ip_idx < s_ip_idx)
3536 continue;
3537 err = inet6_fill_ifacaddr(skb, ifaca,
3538 NETLINK_CB(cb->skb).pid,
3539 cb->nlh->nlmsg_seq,
3540 RTM_GETANYCAST,
3541 NLM_F_MULTI);
3542 }
3543 break;
3544 default:
3545 break;
3546 }
3547 read_unlock_bh(&idev->lock);
3548 in6_dev_put(idev);
3549
3550 if (err <= 0)
3551 break;
3552 cont:
3553 idx++;
3554 }
3555 cb->args[0] = idx;
3556 cb->args[1] = ip_idx;
3557 return skb->len;
3558 }
3559
3560 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3561 {
3562 enum addr_type_t type = UNICAST_ADDR;
3563
3564 return inet6_dump_addr(skb, cb, type);
3565 }
3566
3567 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3568 {
3569 enum addr_type_t type = MULTICAST_ADDR;
3570
3571 return inet6_dump_addr(skb, cb, type);
3572 }
3573
3574
3575 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3576 {
3577 enum addr_type_t type = ANYCAST_ADDR;
3578
3579 return inet6_dump_addr(skb, cb, type);
3580 }
3581
3582 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3583 void *arg)
3584 {
3585 struct net *net = sock_net(in_skb->sk);
3586 struct ifaddrmsg *ifm;
3587 struct nlattr *tb[IFA_MAX+1];
3588 struct in6_addr *addr = NULL;
3589 struct net_device *dev = NULL;
3590 struct inet6_ifaddr *ifa;
3591 struct sk_buff *skb;
3592 int err;
3593
3594 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3595 if (err < 0)
3596 goto errout;
3597
3598 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3599 if (addr == NULL) {
3600 err = -EINVAL;
3601 goto errout;
3602 }
3603
3604 ifm = nlmsg_data(nlh);
3605 if (ifm->ifa_index)
3606 dev = __dev_get_by_index(net, ifm->ifa_index);
3607
3608 if ((ifa = ipv6_get_ifaddr(net, addr, dev, 1)) == NULL) {
3609 err = -EADDRNOTAVAIL;
3610 goto errout;
3611 }
3612
3613 if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) {
3614 err = -ENOBUFS;
3615 goto errout_ifa;
3616 }
3617
3618 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3619 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3620 if (err < 0) {
3621 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3622 WARN_ON(err == -EMSGSIZE);
3623 kfree_skb(skb);
3624 goto errout_ifa;
3625 }
3626 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
3627 errout_ifa:
3628 in6_ifa_put(ifa);
3629 errout:
3630 return err;
3631 }
3632
3633 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3634 {
3635 struct sk_buff *skb;
3636 struct net *net = dev_net(ifa->idev->dev);
3637 int err = -ENOBUFS;
3638
3639 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3640 if (skb == NULL)
3641 goto errout;
3642
3643 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3644 if (err < 0) {
3645 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3646 WARN_ON(err == -EMSGSIZE);
3647 kfree_skb(skb);
3648 goto errout;
3649 }
3650 err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3651 errout:
3652 if (err < 0)
3653 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3654 }
3655
3656 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3657 __s32 *array, int bytes)
3658 {
3659 BUG_ON(bytes < (DEVCONF_MAX * 4));
3660
3661 memset(array, 0, bytes);
3662 array[DEVCONF_FORWARDING] = cnf->forwarding;
3663 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3664 array[DEVCONF_MTU6] = cnf->mtu6;
3665 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3666 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3667 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3668 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3669 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3670 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3671 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3672 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3673 #ifdef CONFIG_IPV6_PRIVACY
3674 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3675 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3676 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3677 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3678 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3679 #endif
3680 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3681 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3682 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3683 #ifdef CONFIG_IPV6_ROUTER_PREF
3684 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3685 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
3686 #ifdef CONFIG_IPV6_ROUTE_INFO
3687 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3688 #endif
3689 #endif
3690 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3691 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3692 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3693 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3694 #endif
3695 #ifdef CONFIG_IPV6_MROUTE
3696 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
3697 #endif
3698 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
3699 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
3700 }
3701
3702 static inline size_t inet6_if_nlmsg_size(void)
3703 {
3704 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3705 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3706 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3707 + nla_total_size(4) /* IFLA_MTU */
3708 + nla_total_size(4) /* IFLA_LINK */
3709 + nla_total_size( /* IFLA_PROTINFO */
3710 nla_total_size(4) /* IFLA_INET6_FLAGS */
3711 + nla_total_size(sizeof(struct ifla_cacheinfo))
3712 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3713 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3714 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
3715 );
3716 }
3717
3718 static inline void __snmp6_fill_stats(u64 *stats, void **mib, int items,
3719 int bytes)
3720 {
3721 int i;
3722 int pad = bytes - sizeof(u64) * items;
3723 BUG_ON(pad < 0);
3724
3725 /* Use put_unaligned() because stats may not be aligned for u64. */
3726 put_unaligned(items, &stats[0]);
3727 for (i = 1; i < items; i++)
3728 put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3729
3730 memset(&stats[items], 0, pad);
3731 }
3732
3733 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3734 int bytes)
3735 {
3736 switch(attrtype) {
3737 case IFLA_INET6_STATS:
3738 __snmp6_fill_stats(stats, (void **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes);
3739 break;
3740 case IFLA_INET6_ICMP6STATS:
3741 __snmp6_fill_stats(stats, (void **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
3742 break;
3743 }
3744 }
3745
3746 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3747 u32 pid, u32 seq, int event, unsigned int flags)
3748 {
3749 struct net_device *dev = idev->dev;
3750 struct nlattr *nla;
3751 struct ifinfomsg *hdr;
3752 struct nlmsghdr *nlh;
3753 void *protoinfo;
3754 struct ifla_cacheinfo ci;
3755
3756 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3757 if (nlh == NULL)
3758 return -EMSGSIZE;
3759
3760 hdr = nlmsg_data(nlh);
3761 hdr->ifi_family = AF_INET6;
3762 hdr->__ifi_pad = 0;
3763 hdr->ifi_type = dev->type;
3764 hdr->ifi_index = dev->ifindex;
3765 hdr->ifi_flags = dev_get_flags(dev);
3766 hdr->ifi_change = 0;
3767
3768 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
3769
3770 if (dev->addr_len)
3771 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3772
3773 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
3774 if (dev->ifindex != dev->iflink)
3775 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
3776
3777 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3778 if (protoinfo == NULL)
3779 goto nla_put_failure;
3780
3781 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
3782
3783 ci.max_reasm_len = IPV6_MAXPLEN;
3784 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3785 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3786 ci.reachable_time = idev->nd_parms->reachable_time;
3787 ci.retrans_time = idev->nd_parms->retrans_time;
3788 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3789
3790 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3791 if (nla == NULL)
3792 goto nla_put_failure;
3793 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
3794
3795 /* XXX - MC not implemented */
3796
3797 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3798 if (nla == NULL)
3799 goto nla_put_failure;
3800 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3801
3802 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3803 if (nla == NULL)
3804 goto nla_put_failure;
3805 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
3806
3807 nla_nest_end(skb, protoinfo);
3808 return nlmsg_end(skb, nlh);
3809
3810 nla_put_failure:
3811 nlmsg_cancel(skb, nlh);
3812 return -EMSGSIZE;
3813 }
3814
3815 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3816 {
3817 struct net *net = sock_net(skb->sk);
3818 int idx, err;
3819 int s_idx = cb->args[0];
3820 struct net_device *dev;
3821 struct inet6_dev *idev;
3822
3823 read_lock(&dev_base_lock);
3824 idx = 0;
3825 for_each_netdev(net, dev) {
3826 if (idx < s_idx)
3827 goto cont;
3828 if ((idev = in6_dev_get(dev)) == NULL)
3829 goto cont;
3830 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
3831 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
3832 in6_dev_put(idev);
3833 if (err <= 0)
3834 break;
3835 cont:
3836 idx++;
3837 }
3838 read_unlock(&dev_base_lock);
3839 cb->args[0] = idx;
3840
3841 return skb->len;
3842 }
3843
3844 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3845 {
3846 struct sk_buff *skb;
3847 struct net *net = dev_net(idev->dev);
3848 int err = -ENOBUFS;
3849
3850 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
3851 if (skb == NULL)
3852 goto errout;
3853
3854 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
3855 if (err < 0) {
3856 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3857 WARN_ON(err == -EMSGSIZE);
3858 kfree_skb(skb);
3859 goto errout;
3860 }
3861 err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3862 errout:
3863 if (err < 0)
3864 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3865 }
3866
3867 static inline size_t inet6_prefix_nlmsg_size(void)
3868 {
3869 return NLMSG_ALIGN(sizeof(struct prefixmsg))
3870 + nla_total_size(sizeof(struct in6_addr))
3871 + nla_total_size(sizeof(struct prefix_cacheinfo));
3872 }
3873
3874 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
3875 struct prefix_info *pinfo, u32 pid, u32 seq,
3876 int event, unsigned int flags)
3877 {
3878 struct prefixmsg *pmsg;
3879 struct nlmsghdr *nlh;
3880 struct prefix_cacheinfo ci;
3881
3882 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
3883 if (nlh == NULL)
3884 return -EMSGSIZE;
3885
3886 pmsg = nlmsg_data(nlh);
3887 pmsg->prefix_family = AF_INET6;
3888 pmsg->prefix_pad1 = 0;
3889 pmsg->prefix_pad2 = 0;
3890 pmsg->prefix_ifindex = idev->dev->ifindex;
3891 pmsg->prefix_len = pinfo->prefix_len;
3892 pmsg->prefix_type = pinfo->type;
3893 pmsg->prefix_pad3 = 0;
3894 pmsg->prefix_flags = 0;
3895 if (pinfo->onlink)
3896 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3897 if (pinfo->autoconf)
3898 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3899
3900 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
3901
3902 ci.preferred_time = ntohl(pinfo->prefered);
3903 ci.valid_time = ntohl(pinfo->valid);
3904 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
3905
3906 return nlmsg_end(skb, nlh);
3907
3908 nla_put_failure:
3909 nlmsg_cancel(skb, nlh);
3910 return -EMSGSIZE;
3911 }
3912
3913 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
3914 struct prefix_info *pinfo)
3915 {
3916 struct sk_buff *skb;
3917 struct net *net = dev_net(idev->dev);
3918 int err = -ENOBUFS;
3919
3920 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
3921 if (skb == NULL)
3922 goto errout;
3923
3924 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
3925 if (err < 0) {
3926 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
3927 WARN_ON(err == -EMSGSIZE);
3928 kfree_skb(skb);
3929 goto errout;
3930 }
3931 err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
3932 errout:
3933 if (err < 0)
3934 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
3935 }
3936
3937 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3938 {
3939 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3940
3941 switch (event) {
3942 case RTM_NEWADDR:
3943 /*
3944 * If the address was optimistic
3945 * we inserted the route at the start of
3946 * our DAD process, so we don't need
3947 * to do it again
3948 */
3949 if (!(ifp->rt->rt6i_node))
3950 ip6_ins_rt(ifp->rt);
3951 if (ifp->idev->cnf.forwarding)
3952 addrconf_join_anycast(ifp);
3953 break;
3954 case RTM_DELADDR:
3955 if (ifp->idev->cnf.forwarding)
3956 addrconf_leave_anycast(ifp);
3957 addrconf_leave_solict(ifp->idev, &ifp->addr);
3958 dst_hold(&ifp->rt->u.dst);
3959 if (ip6_del_rt(ifp->rt))
3960 dst_free(&ifp->rt->u.dst);
3961 break;
3962 }
3963 }
3964
3965 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3966 {
3967 rcu_read_lock_bh();
3968 if (likely(ifp->idev->dead == 0))
3969 __ipv6_ifa_notify(event, ifp);
3970 rcu_read_unlock_bh();
3971 }
3972
3973 #ifdef CONFIG_SYSCTL
3974
3975 static
3976 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3977 void __user *buffer, size_t *lenp, loff_t *ppos)
3978 {
3979 int *valp = ctl->data;
3980 int val = *valp;
3981 int ret;
3982
3983 ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3984
3985 if (write)
3986 ret = addrconf_fixup_forwarding(ctl, valp, val);
3987 return ret;
3988 }
3989
3990 static int addrconf_sysctl_forward_strategy(ctl_table *table,
3991 void __user *oldval,
3992 size_t __user *oldlenp,
3993 void __user *newval, size_t newlen)
3994 {
3995 int *valp = table->data;
3996 int val = *valp;
3997 int new;
3998
3999 if (!newval || !newlen)
4000 return 0;
4001 if (newlen != sizeof(int))
4002 return -EINVAL;
4003 if (get_user(new, (int __user *)newval))
4004 return -EFAULT;
4005 if (new == *valp)
4006 return 0;
4007 if (oldval && oldlenp) {
4008 size_t len;
4009 if (get_user(len, oldlenp))
4010 return -EFAULT;
4011 if (len) {
4012 if (len > table->maxlen)
4013 len = table->maxlen;
4014 if (copy_to_user(oldval, valp, len))
4015 return -EFAULT;
4016 if (put_user(len, oldlenp))
4017 return -EFAULT;
4018 }
4019 }
4020
4021 *valp = new;
4022 return addrconf_fixup_forwarding(table, valp, val);
4023 }
4024
4025 static struct addrconf_sysctl_table
4026 {
4027 struct ctl_table_header *sysctl_header;
4028 ctl_table addrconf_vars[DEVCONF_MAX+1];
4029 char *dev_name;
4030 } addrconf_sysctl __read_mostly = {
4031 .sysctl_header = NULL,
4032 .addrconf_vars = {
4033 {
4034 .ctl_name = NET_IPV6_FORWARDING,
4035 .procname = "forwarding",
4036 .data = &ipv6_devconf.forwarding,
4037 .maxlen = sizeof(int),
4038 .mode = 0644,
4039 .proc_handler = addrconf_sysctl_forward,
4040 .strategy = addrconf_sysctl_forward_strategy,
4041 },
4042 {
4043 .ctl_name = NET_IPV6_HOP_LIMIT,
4044 .procname = "hop_limit",
4045 .data = &ipv6_devconf.hop_limit,
4046 .maxlen = sizeof(int),
4047 .mode = 0644,
4048 .proc_handler = proc_dointvec,
4049 },
4050 {
4051 .ctl_name = NET_IPV6_MTU,
4052 .procname = "mtu",
4053 .data = &ipv6_devconf.mtu6,
4054 .maxlen = sizeof(int),
4055 .mode = 0644,
4056 .proc_handler = proc_dointvec,
4057 },
4058 {
4059 .ctl_name = NET_IPV6_ACCEPT_RA,
4060 .procname = "accept_ra",
4061 .data = &ipv6_devconf.accept_ra,
4062 .maxlen = sizeof(int),
4063 .mode = 0644,
4064 .proc_handler = proc_dointvec,
4065 },
4066 {
4067 .ctl_name = NET_IPV6_ACCEPT_REDIRECTS,
4068 .procname = "accept_redirects",
4069 .data = &ipv6_devconf.accept_redirects,
4070 .maxlen = sizeof(int),
4071 .mode = 0644,
4072 .proc_handler = proc_dointvec,
4073 },
4074 {
4075 .ctl_name = NET_IPV6_AUTOCONF,
4076 .procname = "autoconf",
4077 .data = &ipv6_devconf.autoconf,
4078 .maxlen = sizeof(int),
4079 .mode = 0644,
4080 .proc_handler = proc_dointvec,
4081 },
4082 {
4083 .ctl_name = NET_IPV6_DAD_TRANSMITS,
4084 .procname = "dad_transmits",
4085 .data = &ipv6_devconf.dad_transmits,
4086 .maxlen = sizeof(int),
4087 .mode = 0644,
4088 .proc_handler = proc_dointvec,
4089 },
4090 {
4091 .ctl_name = NET_IPV6_RTR_SOLICITS,
4092 .procname = "router_solicitations",
4093 .data = &ipv6_devconf.rtr_solicits,
4094 .maxlen = sizeof(int),
4095 .mode = 0644,
4096 .proc_handler = proc_dointvec,
4097 },
4098 {
4099 .ctl_name = NET_IPV6_RTR_SOLICIT_INTERVAL,
4100 .procname = "router_solicitation_interval",
4101 .data = &ipv6_devconf.rtr_solicit_interval,
4102 .maxlen = sizeof(int),
4103 .mode = 0644,
4104 .proc_handler = proc_dointvec_jiffies,
4105 .strategy = sysctl_jiffies,
4106 },
4107 {
4108 .ctl_name = NET_IPV6_RTR_SOLICIT_DELAY,
4109 .procname = "router_solicitation_delay",
4110 .data = &ipv6_devconf.rtr_solicit_delay,
4111 .maxlen = sizeof(int),
4112 .mode = 0644,
4113 .proc_handler = proc_dointvec_jiffies,
4114 .strategy = sysctl_jiffies,
4115 },
4116 {
4117 .ctl_name = NET_IPV6_FORCE_MLD_VERSION,
4118 .procname = "force_mld_version",
4119 .data = &ipv6_devconf.force_mld_version,
4120 .maxlen = sizeof(int),
4121 .mode = 0644,
4122 .proc_handler = proc_dointvec,
4123 },
4124 #ifdef CONFIG_IPV6_PRIVACY
4125 {
4126 .ctl_name = NET_IPV6_USE_TEMPADDR,
4127 .procname = "use_tempaddr",
4128 .data = &ipv6_devconf.use_tempaddr,
4129 .maxlen = sizeof(int),
4130 .mode = 0644,
4131 .proc_handler = proc_dointvec,
4132 },
4133 {
4134 .ctl_name = NET_IPV6_TEMP_VALID_LFT,
4135 .procname = "temp_valid_lft",
4136 .data = &ipv6_devconf.temp_valid_lft,
4137 .maxlen = sizeof(int),
4138 .mode = 0644,
4139 .proc_handler = proc_dointvec,
4140 },
4141 {
4142 .ctl_name = NET_IPV6_TEMP_PREFERED_LFT,
4143 .procname = "temp_prefered_lft",
4144 .data = &ipv6_devconf.temp_prefered_lft,
4145 .maxlen = sizeof(int),
4146 .mode = 0644,
4147 .proc_handler = proc_dointvec,
4148 },
4149 {
4150 .ctl_name = NET_IPV6_REGEN_MAX_RETRY,
4151 .procname = "regen_max_retry",
4152 .data = &ipv6_devconf.regen_max_retry,
4153 .maxlen = sizeof(int),
4154 .mode = 0644,
4155 .proc_handler = proc_dointvec,
4156 },
4157 {
4158 .ctl_name = NET_IPV6_MAX_DESYNC_FACTOR,
4159 .procname = "max_desync_factor",
4160 .data = &ipv6_devconf.max_desync_factor,
4161 .maxlen = sizeof(int),
4162 .mode = 0644,
4163 .proc_handler = proc_dointvec,
4164 },
4165 #endif
4166 {
4167 .ctl_name = NET_IPV6_MAX_ADDRESSES,
4168 .procname = "max_addresses",
4169 .data = &ipv6_devconf.max_addresses,
4170 .maxlen = sizeof(int),
4171 .mode = 0644,
4172 .proc_handler = proc_dointvec,
4173 },
4174 {
4175 .ctl_name = NET_IPV6_ACCEPT_RA_DEFRTR,
4176 .procname = "accept_ra_defrtr",
4177 .data = &ipv6_devconf.accept_ra_defrtr,
4178 .maxlen = sizeof(int),
4179 .mode = 0644,
4180 .proc_handler = proc_dointvec,
4181 },
4182 {
4183 .ctl_name = NET_IPV6_ACCEPT_RA_PINFO,
4184 .procname = "accept_ra_pinfo",
4185 .data = &ipv6_devconf.accept_ra_pinfo,
4186 .maxlen = sizeof(int),
4187 .mode = 0644,
4188 .proc_handler = proc_dointvec,
4189 },
4190 #ifdef CONFIG_IPV6_ROUTER_PREF
4191 {
4192 .ctl_name = NET_IPV6_ACCEPT_RA_RTR_PREF,
4193 .procname = "accept_ra_rtr_pref",
4194 .data = &ipv6_devconf.accept_ra_rtr_pref,
4195 .maxlen = sizeof(int),
4196 .mode = 0644,
4197 .proc_handler = proc_dointvec,
4198 },
4199 {
4200 .ctl_name = NET_IPV6_RTR_PROBE_INTERVAL,
4201 .procname = "router_probe_interval",
4202 .data = &ipv6_devconf.rtr_probe_interval,
4203 .maxlen = sizeof(int),
4204 .mode = 0644,
4205 .proc_handler = proc_dointvec_jiffies,
4206 .strategy = sysctl_jiffies,
4207 },
4208 #ifdef CONFIG_IPV6_ROUTE_INFO
4209 {
4210 .ctl_name = NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN,
4211 .procname = "accept_ra_rt_info_max_plen",
4212 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4213 .maxlen = sizeof(int),
4214 .mode = 0644,
4215 .proc_handler = proc_dointvec,
4216 },
4217 #endif
4218 #endif
4219 {
4220 .ctl_name = NET_IPV6_PROXY_NDP,
4221 .procname = "proxy_ndp",
4222 .data = &ipv6_devconf.proxy_ndp,
4223 .maxlen = sizeof(int),
4224 .mode = 0644,
4225 .proc_handler = proc_dointvec,
4226 },
4227 {
4228 .ctl_name = NET_IPV6_ACCEPT_SOURCE_ROUTE,
4229 .procname = "accept_source_route",
4230 .data = &ipv6_devconf.accept_source_route,
4231 .maxlen = sizeof(int),
4232 .mode = 0644,
4233 .proc_handler = proc_dointvec,
4234 },
4235 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4236 {
4237 .ctl_name = CTL_UNNUMBERED,
4238 .procname = "optimistic_dad",
4239 .data = &ipv6_devconf.optimistic_dad,
4240 .maxlen = sizeof(int),
4241 .mode = 0644,
4242 .proc_handler = proc_dointvec,
4243
4244 },
4245 #endif
4246 #ifdef CONFIG_IPV6_MROUTE
4247 {
4248 .ctl_name = CTL_UNNUMBERED,
4249 .procname = "mc_forwarding",
4250 .data = &ipv6_devconf.mc_forwarding,
4251 .maxlen = sizeof(int),
4252 .mode = 0444,
4253 .proc_handler = proc_dointvec,
4254 },
4255 #endif
4256 {
4257 .ctl_name = CTL_UNNUMBERED,
4258 .procname = "disable_ipv6",
4259 .data = &ipv6_devconf.disable_ipv6,
4260 .maxlen = sizeof(int),
4261 .mode = 0644,
4262 .proc_handler = proc_dointvec,
4263 },
4264 {
4265 .ctl_name = CTL_UNNUMBERED,
4266 .procname = "accept_dad",
4267 .data = &ipv6_devconf.accept_dad,
4268 .maxlen = sizeof(int),
4269 .mode = 0644,
4270 .proc_handler = proc_dointvec,
4271 },
4272 {
4273 .ctl_name = 0, /* sentinel */
4274 }
4275 },
4276 };
4277
4278 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4279 int ctl_name, struct inet6_dev *idev, struct ipv6_devconf *p)
4280 {
4281 int i;
4282 struct addrconf_sysctl_table *t;
4283
4284 #define ADDRCONF_CTL_PATH_DEV 3
4285
4286 struct ctl_path addrconf_ctl_path[] = {
4287 { .procname = "net", .ctl_name = CTL_NET, },
4288 { .procname = "ipv6", .ctl_name = NET_IPV6, },
4289 { .procname = "conf", .ctl_name = NET_IPV6_CONF, },
4290 { /* to be set */ },
4291 { },
4292 };
4293
4294
4295 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4296 if (t == NULL)
4297 goto out;
4298
4299 for (i=0; t->addrconf_vars[i].data; i++) {
4300 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
4301 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4302 t->addrconf_vars[i].extra2 = net;
4303 }
4304
4305 /*
4306 * Make a copy of dev_name, because '.procname' is regarded as const
4307 * by sysctl and we wouldn't want anyone to change it under our feet
4308 * (see SIOCSIFNAME).
4309 */
4310 t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4311 if (!t->dev_name)
4312 goto free;
4313
4314 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
4315 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].ctl_name = ctl_name;
4316
4317 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
4318 t->addrconf_vars);
4319 if (t->sysctl_header == NULL)
4320 goto free_procname;
4321
4322 p->sysctl = t;
4323 return 0;
4324
4325 free_procname:
4326 kfree(t->dev_name);
4327 free:
4328 kfree(t);
4329 out:
4330 return -ENOBUFS;
4331 }
4332
4333 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4334 {
4335 struct addrconf_sysctl_table *t;
4336
4337 if (p->sysctl == NULL)
4338 return;
4339
4340 t = p->sysctl;
4341 p->sysctl = NULL;
4342 unregister_sysctl_table(t->sysctl_header);
4343 kfree(t->dev_name);
4344 kfree(t);
4345 }
4346
4347 static void addrconf_sysctl_register(struct inet6_dev *idev)
4348 {
4349 neigh_sysctl_register(idev->dev, idev->nd_parms, NET_IPV6,
4350 NET_IPV6_NEIGH, "ipv6",
4351 &ndisc_ifinfo_sysctl_change,
4352 ndisc_ifinfo_sysctl_strategy);
4353 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
4354 idev->dev->ifindex, idev, &idev->cnf);
4355 }
4356
4357 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
4358 {
4359 __addrconf_sysctl_unregister(&idev->cnf);
4360 neigh_sysctl_unregister(idev->nd_parms);
4361 }
4362
4363
4364 #endif
4365
4366 static int addrconf_init_net(struct net *net)
4367 {
4368 int err;
4369 struct ipv6_devconf *all, *dflt;
4370
4371 err = -ENOMEM;
4372 all = &ipv6_devconf;
4373 dflt = &ipv6_devconf_dflt;
4374
4375 if (net != &init_net) {
4376 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4377 if (all == NULL)
4378 goto err_alloc_all;
4379
4380 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4381 if (dflt == NULL)
4382 goto err_alloc_dflt;
4383 }
4384
4385 net->ipv6.devconf_all = all;
4386 net->ipv6.devconf_dflt = dflt;
4387
4388 #ifdef CONFIG_SYSCTL
4389 err = __addrconf_sysctl_register(net, "all", NET_PROTO_CONF_ALL,
4390 NULL, all);
4391 if (err < 0)
4392 goto err_reg_all;
4393
4394 err = __addrconf_sysctl_register(net, "default", NET_PROTO_CONF_DEFAULT,
4395 NULL, dflt);
4396 if (err < 0)
4397 goto err_reg_dflt;
4398 #endif
4399 return 0;
4400
4401 #ifdef CONFIG_SYSCTL
4402 err_reg_dflt:
4403 __addrconf_sysctl_unregister(all);
4404 err_reg_all:
4405 kfree(dflt);
4406 #endif
4407 err_alloc_dflt:
4408 kfree(all);
4409 err_alloc_all:
4410 return err;
4411 }
4412
4413 static void addrconf_exit_net(struct net *net)
4414 {
4415 #ifdef CONFIG_SYSCTL
4416 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4417 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4418 #endif
4419 if (net != &init_net) {
4420 kfree(net->ipv6.devconf_dflt);
4421 kfree(net->ipv6.devconf_all);
4422 }
4423 }
4424
4425 static struct pernet_operations addrconf_ops = {
4426 .init = addrconf_init_net,
4427 .exit = addrconf_exit_net,
4428 };
4429
4430 /*
4431 * Device notifier
4432 */
4433
4434 int register_inet6addr_notifier(struct notifier_block *nb)
4435 {
4436 return atomic_notifier_chain_register(&inet6addr_chain, nb);
4437 }
4438
4439 EXPORT_SYMBOL(register_inet6addr_notifier);
4440
4441 int unregister_inet6addr_notifier(struct notifier_block *nb)
4442 {
4443 return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
4444 }
4445
4446 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4447
4448 /*
4449 * Init / cleanup code
4450 */
4451
4452 int __init addrconf_init(void)
4453 {
4454 int err;
4455
4456 if ((err = ipv6_addr_label_init()) < 0) {
4457 printk(KERN_CRIT "IPv6 Addrconf: cannot initialize default policy table: %d.\n",
4458 err);
4459 return err;
4460 }
4461
4462 register_pernet_subsys(&addrconf_ops);
4463
4464 /* The addrconf netdev notifier requires that loopback_dev
4465 * has it's ipv6 private information allocated and setup
4466 * before it can bring up and give link-local addresses
4467 * to other devices which are up.
4468 *
4469 * Unfortunately, loopback_dev is not necessarily the first
4470 * entry in the global dev_base list of net devices. In fact,
4471 * it is likely to be the very last entry on that list.
4472 * So this causes the notifier registry below to try and
4473 * give link-local addresses to all devices besides loopback_dev
4474 * first, then loopback_dev, which cases all the non-loopback_dev
4475 * devices to fail to get a link-local address.
4476 *
4477 * So, as a temporary fix, allocate the ipv6 structure for
4478 * loopback_dev first by hand.
4479 * Longer term, all of the dependencies ipv6 has upon the loopback
4480 * device and it being up should be removed.
4481 */
4482 rtnl_lock();
4483 if (!ipv6_add_dev(init_net.loopback_dev))
4484 err = -ENOMEM;
4485 rtnl_unlock();
4486 if (err)
4487 goto errlo;
4488
4489 register_netdevice_notifier(&ipv6_dev_notf);
4490
4491 addrconf_verify(0);
4492
4493 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4494 if (err < 0)
4495 goto errout;
4496
4497 /* Only the first call to __rtnl_register can fail */
4498 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4499 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4500 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4501 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4502 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4503
4504 ipv6_addr_label_rtnl_register();
4505
4506 return 0;
4507 errout:
4508 unregister_netdevice_notifier(&ipv6_dev_notf);
4509 errlo:
4510 unregister_pernet_subsys(&addrconf_ops);
4511
4512 return err;
4513 }
4514
4515 void addrconf_cleanup(void)
4516 {
4517 struct inet6_ifaddr *ifa;
4518 struct net_device *dev;
4519 int i;
4520
4521 unregister_netdevice_notifier(&ipv6_dev_notf);
4522 unregister_pernet_subsys(&addrconf_ops);
4523
4524 rtnl_lock();
4525
4526 /* clean dev list */
4527 for_each_netdev(&init_net, dev) {
4528 if (__in6_dev_get(dev) == NULL)
4529 continue;
4530 addrconf_ifdown(dev, 1);
4531 }
4532 addrconf_ifdown(init_net.loopback_dev, 2);
4533
4534 /*
4535 * Check hash table.
4536 */
4537 write_lock_bh(&addrconf_hash_lock);
4538 for (i=0; i < IN6_ADDR_HSIZE; i++) {
4539 for (ifa=inet6_addr_lst[i]; ifa; ) {
4540 struct inet6_ifaddr *bifa;
4541
4542 bifa = ifa;
4543 ifa = ifa->lst_next;
4544 printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
4545 /* Do not free it; something is wrong.
4546 Now we can investigate it with debugger.
4547 */
4548 }
4549 }
4550 write_unlock_bh(&addrconf_hash_lock);
4551
4552 del_timer(&addr_chk_timer);
4553 rtnl_unlock();
4554 }
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree