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orinoco: Fix interesting checkpatch errors
[linux-2.6/mini2440.git] / net / ipv6 / addrconf.c
blob03e2a1ad71e9605e95ed47f2688412cd9f86b8df
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 void 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;
503
504 rtnl_lock();
505 if (p == &net->ipv6.devconf_all->forwarding) {
506 __s32 newf = net->ipv6.devconf_all->forwarding;
507 net->ipv6.devconf_dflt->forwarding = newf;
508 addrconf_forward_change(net, newf);
509 } else if ((!*p) ^ (!old))
510 dev_forward_change((struct inet6_dev *)table->extra1);
511 rtnl_unlock();
512
513 if (*p)
514 rt6_purge_dflt_routers(net);
515 }
516 #endif
517
518 /* Nobody refers to this ifaddr, destroy it */
519
520 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
521 {
522 WARN_ON(ifp->if_next != NULL);
523 WARN_ON(ifp->lst_next != NULL);
524
525 #ifdef NET_REFCNT_DEBUG
526 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
527 #endif
528
529 in6_dev_put(ifp->idev);
530
531 if (del_timer(&ifp->timer))
532 printk("Timer is still running, when freeing ifa=%p\n", ifp);
533
534 if (!ifp->dead) {
535 printk("Freeing alive inet6 address %p\n", ifp);
536 return;
537 }
538 dst_release(&ifp->rt->u.dst);
539
540 kfree(ifp);
541 }
542
543 static void
544 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
545 {
546 struct inet6_ifaddr *ifa, **ifap;
547 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
548
549 /*
550 * Each device address list is sorted in order of scope -
551 * global before linklocal.
552 */
553 for (ifap = &idev->addr_list; (ifa = *ifap) != NULL;
554 ifap = &ifa->if_next) {
555 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
556 break;
557 }
558
559 ifp->if_next = *ifap;
560 *ifap = ifp;
561 }
562
563 /*
564 * Hash function taken from net_alias.c
565 */
566 static u8 ipv6_addr_hash(const struct in6_addr *addr)
567 {
568 __u32 word;
569
570 /*
571 * We perform the hash function over the last 64 bits of the address
572 * This will include the IEEE address token on links that support it.
573 */
574
575 word = (__force u32)(addr->s6_addr32[2] ^ addr->s6_addr32[3]);
576 word ^= (word >> 16);
577 word ^= (word >> 8);
578
579 return ((word ^ (word >> 4)) & 0x0f);
580 }
581
582 /* On success it returns ifp with increased reference count */
583
584 static struct inet6_ifaddr *
585 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
586 int scope, u32 flags)
587 {
588 struct inet6_ifaddr *ifa = NULL;
589 struct rt6_info *rt;
590 int hash;
591 int err = 0;
592 int addr_type = ipv6_addr_type(addr);
593
594 if (addr_type == IPV6_ADDR_ANY ||
595 addr_type & IPV6_ADDR_MULTICAST ||
596 (!(idev->dev->flags & IFF_LOOPBACK) &&
597 addr_type & IPV6_ADDR_LOOPBACK))
598 return ERR_PTR(-EADDRNOTAVAIL);
599
600 rcu_read_lock_bh();
601 if (idev->dead) {
602 err = -ENODEV; /*XXX*/
603 goto out2;
604 }
605
606 write_lock(&addrconf_hash_lock);
607
608 /* Ignore adding duplicate addresses on an interface */
609 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
610 ADBG(("ipv6_add_addr: already assigned\n"));
611 err = -EEXIST;
612 goto out;
613 }
614
615 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
616
617 if (ifa == NULL) {
618 ADBG(("ipv6_add_addr: malloc failed\n"));
619 err = -ENOBUFS;
620 goto out;
621 }
622
623 rt = addrconf_dst_alloc(idev, addr, 0);
624 if (IS_ERR(rt)) {
625 err = PTR_ERR(rt);
626 goto out;
627 }
628
629 ipv6_addr_copy(&ifa->addr, addr);
630
631 spin_lock_init(&ifa->lock);
632 init_timer(&ifa->timer);
633 ifa->timer.data = (unsigned long) ifa;
634 ifa->scope = scope;
635 ifa->prefix_len = pfxlen;
636 ifa->flags = flags | IFA_F_TENTATIVE;
637 ifa->cstamp = ifa->tstamp = jiffies;
638
639 ifa->rt = rt;
640
641 /*
642 * part one of RFC 4429, section 3.3
643 * We should not configure an address as
644 * optimistic if we do not yet know the link
645 * layer address of our nexhop router
646 */
647
648 if (rt->rt6i_nexthop == NULL)
649 ifa->flags &= ~IFA_F_OPTIMISTIC;
650
651 ifa->idev = idev;
652 in6_dev_hold(idev);
653 /* For caller */
654 in6_ifa_hold(ifa);
655
656 /* Add to big hash table */
657 hash = ipv6_addr_hash(addr);
658
659 ifa->lst_next = inet6_addr_lst[hash];
660 inet6_addr_lst[hash] = ifa;
661 in6_ifa_hold(ifa);
662 write_unlock(&addrconf_hash_lock);
663
664 write_lock(&idev->lock);
665 /* Add to inet6_dev unicast addr list. */
666 ipv6_link_dev_addr(idev, ifa);
667
668 #ifdef CONFIG_IPV6_PRIVACY
669 if (ifa->flags&IFA_F_TEMPORARY) {
670 ifa->tmp_next = idev->tempaddr_list;
671 idev->tempaddr_list = ifa;
672 in6_ifa_hold(ifa);
673 }
674 #endif
675
676 in6_ifa_hold(ifa);
677 write_unlock(&idev->lock);
678 out2:
679 rcu_read_unlock_bh();
680
681 if (likely(err == 0))
682 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
683 else {
684 kfree(ifa);
685 ifa = ERR_PTR(err);
686 }
687
688 return ifa;
689 out:
690 write_unlock(&addrconf_hash_lock);
691 goto out2;
692 }
693
694 /* This function wants to get referenced ifp and releases it before return */
695
696 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
697 {
698 struct inet6_ifaddr *ifa, **ifap;
699 struct inet6_dev *idev = ifp->idev;
700 int hash;
701 int deleted = 0, onlink = 0;
702 unsigned long expires = jiffies;
703
704 hash = ipv6_addr_hash(&ifp->addr);
705
706 ifp->dead = 1;
707
708 write_lock_bh(&addrconf_hash_lock);
709 for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
710 ifap = &ifa->lst_next) {
711 if (ifa == ifp) {
712 *ifap = ifa->lst_next;
713 __in6_ifa_put(ifp);
714 ifa->lst_next = NULL;
715 break;
716 }
717 }
718 write_unlock_bh(&addrconf_hash_lock);
719
720 write_lock_bh(&idev->lock);
721 #ifdef CONFIG_IPV6_PRIVACY
722 if (ifp->flags&IFA_F_TEMPORARY) {
723 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
724 ifap = &ifa->tmp_next) {
725 if (ifa == ifp) {
726 *ifap = ifa->tmp_next;
727 if (ifp->ifpub) {
728 in6_ifa_put(ifp->ifpub);
729 ifp->ifpub = NULL;
730 }
731 __in6_ifa_put(ifp);
732 ifa->tmp_next = NULL;
733 break;
734 }
735 }
736 }
737 #endif
738
739 for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
740 if (ifa == ifp) {
741 *ifap = ifa->if_next;
742 __in6_ifa_put(ifp);
743 ifa->if_next = NULL;
744 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
745 break;
746 deleted = 1;
747 continue;
748 } else if (ifp->flags & IFA_F_PERMANENT) {
749 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
750 ifp->prefix_len)) {
751 if (ifa->flags & IFA_F_PERMANENT) {
752 onlink = 1;
753 if (deleted)
754 break;
755 } else {
756 unsigned long lifetime;
757
758 if (!onlink)
759 onlink = -1;
760
761 spin_lock(&ifa->lock);
762
763 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
764 /*
765 * Note: Because this address is
766 * not permanent, lifetime <
767 * LONG_MAX / HZ here.
768 */
769 if (time_before(expires,
770 ifa->tstamp + lifetime * HZ))
771 expires = ifa->tstamp + lifetime * HZ;
772 spin_unlock(&ifa->lock);
773 }
774 }
775 }
776 ifap = &ifa->if_next;
777 }
778 write_unlock_bh(&idev->lock);
779
780 addrconf_del_timer(ifp);
781
782 ipv6_ifa_notify(RTM_DELADDR, ifp);
783
784 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
785
786 /*
787 * Purge or update corresponding prefix
788 *
789 * 1) we don't purge prefix here if address was not permanent.
790 * prefix is managed by its own lifetime.
791 * 2) if there're no addresses, delete prefix.
792 * 3) if there're still other permanent address(es),
793 * corresponding prefix is still permanent.
794 * 4) otherwise, update prefix lifetime to the
795 * longest valid lifetime among the corresponding
796 * addresses on the device.
797 * Note: subsequent RA will update lifetime.
798 *
799 * --yoshfuji
800 */
801 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
802 struct in6_addr prefix;
803 struct rt6_info *rt;
804 struct net *net = dev_net(ifp->idev->dev);
805 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
806 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1);
807
808 if (rt && addrconf_is_prefix_route(rt)) {
809 if (onlink == 0) {
810 ip6_del_rt(rt);
811 rt = NULL;
812 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
813 rt->rt6i_expires = expires;
814 rt->rt6i_flags |= RTF_EXPIRES;
815 }
816 }
817 dst_release(&rt->u.dst);
818 }
819
820 in6_ifa_put(ifp);
821 }
822
823 #ifdef CONFIG_IPV6_PRIVACY
824 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
825 {
826 struct inet6_dev *idev = ifp->idev;
827 struct in6_addr addr, *tmpaddr;
828 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
829 unsigned long regen_advance;
830 int tmp_plen;
831 int ret = 0;
832 int max_addresses;
833 u32 addr_flags;
834
835 write_lock(&idev->lock);
836 if (ift) {
837 spin_lock_bh(&ift->lock);
838 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
839 spin_unlock_bh(&ift->lock);
840 tmpaddr = &addr;
841 } else {
842 tmpaddr = NULL;
843 }
844 retry:
845 in6_dev_hold(idev);
846 if (idev->cnf.use_tempaddr <= 0) {
847 write_unlock(&idev->lock);
848 printk(KERN_INFO
849 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
850 in6_dev_put(idev);
851 ret = -1;
852 goto out;
853 }
854 spin_lock_bh(&ifp->lock);
855 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
856 idev->cnf.use_tempaddr = -1; /*XXX*/
857 spin_unlock_bh(&ifp->lock);
858 write_unlock(&idev->lock);
859 printk(KERN_WARNING
860 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
861 in6_dev_put(idev);
862 ret = -1;
863 goto out;
864 }
865 in6_ifa_hold(ifp);
866 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
867 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
868 spin_unlock_bh(&ifp->lock);
869 write_unlock(&idev->lock);
870 printk(KERN_WARNING
871 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
872 in6_ifa_put(ifp);
873 in6_dev_put(idev);
874 ret = -1;
875 goto out;
876 }
877 memcpy(&addr.s6_addr[8], idev->rndid, 8);
878 tmp_valid_lft = min_t(__u32,
879 ifp->valid_lft,
880 idev->cnf.temp_valid_lft);
881 tmp_prefered_lft = min_t(__u32,
882 ifp->prefered_lft,
883 idev->cnf.temp_prefered_lft - desync_factor / HZ);
884 tmp_plen = ifp->prefix_len;
885 max_addresses = idev->cnf.max_addresses;
886 tmp_cstamp = ifp->cstamp;
887 tmp_tstamp = ifp->tstamp;
888 spin_unlock_bh(&ifp->lock);
889
890 regen_advance = idev->cnf.regen_max_retry *
891 idev->cnf.dad_transmits *
892 idev->nd_parms->retrans_time / HZ;
893 write_unlock(&idev->lock);
894
895 /* A temporary address is created only if this calculated Preferred
896 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
897 * an implementation must not create a temporary address with a zero
898 * Preferred Lifetime.
899 */
900 if (tmp_prefered_lft <= regen_advance) {
901 in6_ifa_put(ifp);
902 in6_dev_put(idev);
903 ret = -1;
904 goto out;
905 }
906
907 addr_flags = IFA_F_TEMPORARY;
908 /* set in addrconf_prefix_rcv() */
909 if (ifp->flags & IFA_F_OPTIMISTIC)
910 addr_flags |= IFA_F_OPTIMISTIC;
911
912 ift = !max_addresses ||
913 ipv6_count_addresses(idev) < max_addresses ?
914 ipv6_add_addr(idev, &addr, tmp_plen,
915 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
916 addr_flags) : NULL;
917 if (!ift || IS_ERR(ift)) {
918 in6_ifa_put(ifp);
919 in6_dev_put(idev);
920 printk(KERN_INFO
921 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
922 tmpaddr = &addr;
923 write_lock(&idev->lock);
924 goto retry;
925 }
926
927 spin_lock_bh(&ift->lock);
928 ift->ifpub = ifp;
929 ift->valid_lft = tmp_valid_lft;
930 ift->prefered_lft = tmp_prefered_lft;
931 ift->cstamp = tmp_cstamp;
932 ift->tstamp = tmp_tstamp;
933 spin_unlock_bh(&ift->lock);
934
935 addrconf_dad_start(ift, 0);
936 in6_ifa_put(ift);
937 in6_dev_put(idev);
938 out:
939 return ret;
940 }
941 #endif
942
943 /*
944 * Choose an appropriate source address (RFC3484)
945 */
946 enum {
947 IPV6_SADDR_RULE_INIT = 0,
948 IPV6_SADDR_RULE_LOCAL,
949 IPV6_SADDR_RULE_SCOPE,
950 IPV6_SADDR_RULE_PREFERRED,
951 #ifdef CONFIG_IPV6_MIP6
952 IPV6_SADDR_RULE_HOA,
953 #endif
954 IPV6_SADDR_RULE_OIF,
955 IPV6_SADDR_RULE_LABEL,
956 #ifdef CONFIG_IPV6_PRIVACY
957 IPV6_SADDR_RULE_PRIVACY,
958 #endif
959 IPV6_SADDR_RULE_ORCHID,
960 IPV6_SADDR_RULE_PREFIX,
961 IPV6_SADDR_RULE_MAX
962 };
963
964 struct ipv6_saddr_score {
965 int rule;
966 int addr_type;
967 struct inet6_ifaddr *ifa;
968 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
969 int scopedist;
970 int matchlen;
971 };
972
973 struct ipv6_saddr_dst {
974 const struct in6_addr *addr;
975 int ifindex;
976 int scope;
977 int label;
978 unsigned int prefs;
979 };
980
981 static inline int ipv6_saddr_preferred(int type)
982 {
983 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
984 IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
985 return 1;
986 return 0;
987 }
988
989 static int ipv6_get_saddr_eval(struct net *net,
990 struct ipv6_saddr_score *score,
991 struct ipv6_saddr_dst *dst,
992 int i)
993 {
994 int ret;
995
996 if (i <= score->rule) {
997 switch (i) {
998 case IPV6_SADDR_RULE_SCOPE:
999 ret = score->scopedist;
1000 break;
1001 case IPV6_SADDR_RULE_PREFIX:
1002 ret = score->matchlen;
1003 break;
1004 default:
1005 ret = !!test_bit(i, score->scorebits);
1006 }
1007 goto out;
1008 }
1009
1010 switch (i) {
1011 case IPV6_SADDR_RULE_INIT:
1012 /* Rule 0: remember if hiscore is not ready yet */
1013 ret = !!score->ifa;
1014 break;
1015 case IPV6_SADDR_RULE_LOCAL:
1016 /* Rule 1: Prefer same address */
1017 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1018 break;
1019 case IPV6_SADDR_RULE_SCOPE:
1020 /* Rule 2: Prefer appropriate scope
1021 *
1022 * ret
1023 * ^
1024 * -1 | d 15
1025 * ---+--+-+---> scope
1026 * |
1027 * | d is scope of the destination.
1028 * B-d | \
1029 * | \ <- smaller scope is better if
1030 * B-15 | \ if scope is enough for destinaion.
1031 * | ret = B - scope (-1 <= scope >= d <= 15).
1032 * d-C-1 | /
1033 * |/ <- greater is better
1034 * -C / if scope is not enough for destination.
1035 * /| ret = scope - C (-1 <= d < scope <= 15).
1036 *
1037 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1038 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1039 * Assume B = 0 and we get C > 29.
1040 */
1041 ret = __ipv6_addr_src_scope(score->addr_type);
1042 if (ret >= dst->scope)
1043 ret = -ret;
1044 else
1045 ret -= 128; /* 30 is enough */
1046 score->scopedist = ret;
1047 break;
1048 case IPV6_SADDR_RULE_PREFERRED:
1049 /* Rule 3: Avoid deprecated and optimistic addresses */
1050 ret = ipv6_saddr_preferred(score->addr_type) ||
1051 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1052 break;
1053 #ifdef CONFIG_IPV6_MIP6
1054 case IPV6_SADDR_RULE_HOA:
1055 {
1056 /* Rule 4: Prefer home address */
1057 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1058 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1059 break;
1060 }
1061 #endif
1062 case IPV6_SADDR_RULE_OIF:
1063 /* Rule 5: Prefer outgoing interface */
1064 ret = (!dst->ifindex ||
1065 dst->ifindex == score->ifa->idev->dev->ifindex);
1066 break;
1067 case IPV6_SADDR_RULE_LABEL:
1068 /* Rule 6: Prefer matching label */
1069 ret = ipv6_addr_label(net,
1070 &score->ifa->addr, score->addr_type,
1071 score->ifa->idev->dev->ifindex) == dst->label;
1072 break;
1073 #ifdef CONFIG_IPV6_PRIVACY
1074 case IPV6_SADDR_RULE_PRIVACY:
1075 {
1076 /* Rule 7: Prefer public address
1077 * Note: prefer temprary address if use_tempaddr >= 2
1078 */
1079 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1080 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1081 score->ifa->idev->cnf.use_tempaddr >= 2;
1082 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1083 break;
1084 }
1085 #endif
1086 case IPV6_SADDR_RULE_ORCHID:
1087 /* Rule 8-: Prefer ORCHID vs ORCHID or
1088 * non-ORCHID vs non-ORCHID
1089 */
1090 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1091 ipv6_addr_orchid(dst->addr));
1092 break;
1093 case IPV6_SADDR_RULE_PREFIX:
1094 /* Rule 8: Use longest matching prefix */
1095 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr,
1096 dst->addr);
1097 break;
1098 default:
1099 ret = 0;
1100 }
1101
1102 if (ret)
1103 __set_bit(i, score->scorebits);
1104 score->rule = i;
1105 out:
1106 return ret;
1107 }
1108
1109 int ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev,
1110 const struct in6_addr *daddr, unsigned int prefs,
1111 struct in6_addr *saddr)
1112 {
1113 struct ipv6_saddr_score scores[2],
1114 *score = &scores[0], *hiscore = &scores[1];
1115 struct ipv6_saddr_dst dst;
1116 struct net_device *dev;
1117 int dst_type;
1118
1119 dst_type = __ipv6_addr_type(daddr);
1120 dst.addr = daddr;
1121 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1122 dst.scope = __ipv6_addr_src_scope(dst_type);
1123 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1124 dst.prefs = prefs;
1125
1126 hiscore->rule = -1;
1127 hiscore->ifa = NULL;
1128
1129 read_lock(&dev_base_lock);
1130 rcu_read_lock();
1131
1132 for_each_netdev(net, dev) {
1133 struct inet6_dev *idev;
1134
1135 /* Candidate Source Address (section 4)
1136 * - multicast and link-local destination address,
1137 * the set of candidate source address MUST only
1138 * include addresses assigned to interfaces
1139 * belonging to the same link as the outgoing
1140 * interface.
1141 * (- For site-local destination addresses, the
1142 * set of candidate source addresses MUST only
1143 * include addresses assigned to interfaces
1144 * belonging to the same site as the outgoing
1145 * interface.)
1146 */
1147 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1148 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1149 dst.ifindex && dev->ifindex != dst.ifindex)
1150 continue;
1151
1152 idev = __in6_dev_get(dev);
1153 if (!idev)
1154 continue;
1155
1156 read_lock_bh(&idev->lock);
1157 for (score->ifa = idev->addr_list; score->ifa; score->ifa = score->ifa->if_next) {
1158 int i;
1159
1160 /*
1161 * - Tentative Address (RFC2462 section 5.4)
1162 * - A tentative address is not considered
1163 * "assigned to an interface" in the traditional
1164 * sense, unless it is also flagged as optimistic.
1165 * - Candidate Source Address (section 4)
1166 * - In any case, anycast addresses, multicast
1167 * addresses, and the unspecified address MUST
1168 * NOT be included in a candidate set.
1169 */
1170 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1171 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1172 continue;
1173
1174 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1175
1176 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1177 score->addr_type & IPV6_ADDR_MULTICAST)) {
1178 LIMIT_NETDEBUG(KERN_DEBUG
1179 "ADDRCONF: unspecified / multicast address "
1180 "assigned as unicast address on %s",
1181 dev->name);
1182 continue;
1183 }
1184
1185 score->rule = -1;
1186 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1187
1188 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1189 int minihiscore, miniscore;
1190
1191 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1192 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1193
1194 if (minihiscore > miniscore) {
1195 if (i == IPV6_SADDR_RULE_SCOPE &&
1196 score->scopedist > 0) {
1197 /*
1198 * special case:
1199 * each remaining entry
1200 * has too small (not enough)
1201 * scope, because ifa entries
1202 * are sorted by their scope
1203 * values.
1204 */
1205 goto try_nextdev;
1206 }
1207 break;
1208 } else if (minihiscore < miniscore) {
1209 struct ipv6_saddr_score *tmp;
1210
1211 if (hiscore->ifa)
1212 in6_ifa_put(hiscore->ifa);
1213
1214 in6_ifa_hold(score->ifa);
1215
1216 tmp = hiscore;
1217 hiscore = score;
1218 score = tmp;
1219
1220 /* restore our iterator */
1221 score->ifa = hiscore->ifa;
1222
1223 break;
1224 }
1225 }
1226 }
1227 try_nextdev:
1228 read_unlock_bh(&idev->lock);
1229 }
1230 rcu_read_unlock();
1231 read_unlock(&dev_base_lock);
1232
1233 if (!hiscore->ifa)
1234 return -EADDRNOTAVAIL;
1235
1236 ipv6_addr_copy(saddr, &hiscore->ifa->addr);
1237 in6_ifa_put(hiscore->ifa);
1238 return 0;
1239 }
1240
1241 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1242
1243 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1244 unsigned char banned_flags)
1245 {
1246 struct inet6_dev *idev;
1247 int err = -EADDRNOTAVAIL;
1248
1249 rcu_read_lock();
1250 if ((idev = __in6_dev_get(dev)) != NULL) {
1251 struct inet6_ifaddr *ifp;
1252
1253 read_lock_bh(&idev->lock);
1254 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1255 if (ifp->scope == IFA_LINK && !(ifp->flags & banned_flags)) {
1256 ipv6_addr_copy(addr, &ifp->addr);
1257 err = 0;
1258 break;
1259 }
1260 }
1261 read_unlock_bh(&idev->lock);
1262 }
1263 rcu_read_unlock();
1264 return err;
1265 }
1266
1267 static int ipv6_count_addresses(struct inet6_dev *idev)
1268 {
1269 int cnt = 0;
1270 struct inet6_ifaddr *ifp;
1271
1272 read_lock_bh(&idev->lock);
1273 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1274 cnt++;
1275 read_unlock_bh(&idev->lock);
1276 return cnt;
1277 }
1278
1279 int ipv6_chk_addr(struct net *net, struct in6_addr *addr,
1280 struct net_device *dev, int strict)
1281 {
1282 struct inet6_ifaddr * ifp;
1283 u8 hash = ipv6_addr_hash(addr);
1284
1285 read_lock_bh(&addrconf_hash_lock);
1286 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1287 if (!net_eq(dev_net(ifp->idev->dev), net))
1288 continue;
1289 if (ipv6_addr_equal(&ifp->addr, addr) &&
1290 !(ifp->flags&IFA_F_TENTATIVE)) {
1291 if (dev == NULL || ifp->idev->dev == dev ||
1292 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1293 break;
1294 }
1295 }
1296 read_unlock_bh(&addrconf_hash_lock);
1297 return ifp != NULL;
1298 }
1299 EXPORT_SYMBOL(ipv6_chk_addr);
1300
1301 static
1302 int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1303 struct net_device *dev)
1304 {
1305 struct inet6_ifaddr * ifp;
1306 u8 hash = ipv6_addr_hash(addr);
1307
1308 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1309 if (!net_eq(dev_net(ifp->idev->dev), net))
1310 continue;
1311 if (ipv6_addr_equal(&ifp->addr, addr)) {
1312 if (dev == NULL || ifp->idev->dev == dev)
1313 break;
1314 }
1315 }
1316 return ifp != NULL;
1317 }
1318
1319 int ipv6_chk_prefix(struct in6_addr *addr, struct net_device *dev)
1320 {
1321 struct inet6_dev *idev;
1322 struct inet6_ifaddr *ifa;
1323 int onlink;
1324
1325 onlink = 0;
1326 rcu_read_lock();
1327 idev = __in6_dev_get(dev);
1328 if (idev) {
1329 read_lock_bh(&idev->lock);
1330 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
1331 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1332 ifa->prefix_len);
1333 if (onlink)
1334 break;
1335 }
1336 read_unlock_bh(&idev->lock);
1337 }
1338 rcu_read_unlock();
1339 return onlink;
1340 }
1341
1342 EXPORT_SYMBOL(ipv6_chk_prefix);
1343
1344 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1345 struct net_device *dev, int strict)
1346 {
1347 struct inet6_ifaddr * ifp;
1348 u8 hash = ipv6_addr_hash(addr);
1349
1350 read_lock_bh(&addrconf_hash_lock);
1351 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1352 if (!net_eq(dev_net(ifp->idev->dev), net))
1353 continue;
1354 if (ipv6_addr_equal(&ifp->addr, addr)) {
1355 if (dev == NULL || ifp->idev->dev == dev ||
1356 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1357 in6_ifa_hold(ifp);
1358 break;
1359 }
1360 }
1361 }
1362 read_unlock_bh(&addrconf_hash_lock);
1363
1364 return ifp;
1365 }
1366
1367 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1368 {
1369 const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
1370 const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
1371 __be32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
1372 __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1373 int sk_ipv6only = ipv6_only_sock(sk);
1374 int sk2_ipv6only = inet_v6_ipv6only(sk2);
1375 int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1376 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1377
1378 if (!sk2_rcv_saddr && !sk_ipv6only)
1379 return 1;
1380
1381 if (addr_type2 == IPV6_ADDR_ANY &&
1382 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1383 return 1;
1384
1385 if (addr_type == IPV6_ADDR_ANY &&
1386 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1387 return 1;
1388
1389 if (sk2_rcv_saddr6 &&
1390 ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1391 return 1;
1392
1393 if (addr_type == IPV6_ADDR_MAPPED &&
1394 !sk2_ipv6only &&
1395 (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1396 return 1;
1397
1398 return 0;
1399 }
1400
1401 /* Gets referenced address, destroys ifaddr */
1402
1403 static void addrconf_dad_stop(struct inet6_ifaddr *ifp)
1404 {
1405 if (ifp->flags&IFA_F_PERMANENT) {
1406 spin_lock_bh(&ifp->lock);
1407 addrconf_del_timer(ifp);
1408 ifp->flags |= IFA_F_TENTATIVE;
1409 spin_unlock_bh(&ifp->lock);
1410 in6_ifa_put(ifp);
1411 #ifdef CONFIG_IPV6_PRIVACY
1412 } else if (ifp->flags&IFA_F_TEMPORARY) {
1413 struct inet6_ifaddr *ifpub;
1414 spin_lock_bh(&ifp->lock);
1415 ifpub = ifp->ifpub;
1416 if (ifpub) {
1417 in6_ifa_hold(ifpub);
1418 spin_unlock_bh(&ifp->lock);
1419 ipv6_create_tempaddr(ifpub, ifp);
1420 in6_ifa_put(ifpub);
1421 } else {
1422 spin_unlock_bh(&ifp->lock);
1423 }
1424 ipv6_del_addr(ifp);
1425 #endif
1426 } else
1427 ipv6_del_addr(ifp);
1428 }
1429
1430 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1431 {
1432 struct inet6_dev *idev = ifp->idev;
1433 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1434 struct in6_addr addr;
1435
1436 addr.s6_addr32[0] = htonl(0xfe800000);
1437 addr.s6_addr32[1] = 0;
1438
1439 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1440 ipv6_addr_equal(&ifp->addr, &addr)) {
1441 /* DAD failed for link-local based on MAC address */
1442 idev->cnf.disable_ipv6 = 1;
1443 }
1444 }
1445
1446 if (net_ratelimit())
1447 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1448 addrconf_dad_stop(ifp);
1449 }
1450
1451 /* Join to solicited addr multicast group. */
1452
1453 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1454 {
1455 struct in6_addr maddr;
1456
1457 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1458 return;
1459
1460 addrconf_addr_solict_mult(addr, &maddr);
1461 ipv6_dev_mc_inc(dev, &maddr);
1462 }
1463
1464 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1465 {
1466 struct in6_addr maddr;
1467
1468 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1469 return;
1470
1471 addrconf_addr_solict_mult(addr, &maddr);
1472 __ipv6_dev_mc_dec(idev, &maddr);
1473 }
1474
1475 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1476 {
1477 struct in6_addr addr;
1478 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1479 if (ipv6_addr_any(&addr))
1480 return;
1481 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1482 }
1483
1484 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1485 {
1486 struct in6_addr addr;
1487 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1488 if (ipv6_addr_any(&addr))
1489 return;
1490 __ipv6_dev_ac_dec(ifp->idev, &addr);
1491 }
1492
1493 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1494 {
1495 if (dev->addr_len != ETH_ALEN)
1496 return -1;
1497 memcpy(eui, dev->dev_addr, 3);
1498 memcpy(eui + 5, dev->dev_addr + 3, 3);
1499
1500 /*
1501 * The zSeries OSA network cards can be shared among various
1502 * OS instances, but the OSA cards have only one MAC address.
1503 * This leads to duplicate address conflicts in conjunction
1504 * with IPv6 if more than one instance uses the same card.
1505 *
1506 * The driver for these cards can deliver a unique 16-bit
1507 * identifier for each instance sharing the same card. It is
1508 * placed instead of 0xFFFE in the interface identifier. The
1509 * "u" bit of the interface identifier is not inverted in this
1510 * case. Hence the resulting interface identifier has local
1511 * scope according to RFC2373.
1512 */
1513 if (dev->dev_id) {
1514 eui[3] = (dev->dev_id >> 8) & 0xFF;
1515 eui[4] = dev->dev_id & 0xFF;
1516 } else {
1517 eui[3] = 0xFF;
1518 eui[4] = 0xFE;
1519 eui[0] ^= 2;
1520 }
1521 return 0;
1522 }
1523
1524 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1525 {
1526 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1527 if (dev->addr_len != ARCNET_ALEN)
1528 return -1;
1529 memset(eui, 0, 7);
1530 eui[7] = *(u8*)dev->dev_addr;
1531 return 0;
1532 }
1533
1534 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1535 {
1536 if (dev->addr_len != INFINIBAND_ALEN)
1537 return -1;
1538 memcpy(eui, dev->dev_addr + 12, 8);
1539 eui[0] |= 2;
1540 return 0;
1541 }
1542
1543 int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1544 {
1545 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1546 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1547 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1548 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1549 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1550 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1551 eui[1] = 0;
1552 eui[2] = 0x5E;
1553 eui[3] = 0xFE;
1554 memcpy(eui + 4, &addr, 4);
1555 return 0;
1556 }
1557 EXPORT_SYMBOL(__ipv6_isatap_ifid);
1558
1559 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1560 {
1561 if (dev->priv_flags & IFF_ISATAP)
1562 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1563 return -1;
1564 }
1565
1566 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1567 {
1568 switch (dev->type) {
1569 case ARPHRD_ETHER:
1570 case ARPHRD_FDDI:
1571 case ARPHRD_IEEE802_TR:
1572 return addrconf_ifid_eui48(eui, dev);
1573 case ARPHRD_ARCNET:
1574 return addrconf_ifid_arcnet(eui, dev);
1575 case ARPHRD_INFINIBAND:
1576 return addrconf_ifid_infiniband(eui, dev);
1577 case ARPHRD_SIT:
1578 return addrconf_ifid_sit(eui, dev);
1579 }
1580 return -1;
1581 }
1582
1583 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1584 {
1585 int err = -1;
1586 struct inet6_ifaddr *ifp;
1587
1588 read_lock_bh(&idev->lock);
1589 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1590 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1591 memcpy(eui, ifp->addr.s6_addr+8, 8);
1592 err = 0;
1593 break;
1594 }
1595 }
1596 read_unlock_bh(&idev->lock);
1597 return err;
1598 }
1599
1600 #ifdef CONFIG_IPV6_PRIVACY
1601 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1602 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1603 {
1604 regen:
1605 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1606 idev->rndid[0] &= ~0x02;
1607
1608 /*
1609 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1610 * check if generated address is not inappropriate
1611 *
1612 * - Reserved subnet anycast (RFC 2526)
1613 * 11111101 11....11 1xxxxxxx
1614 * - ISATAP (RFC4214) 6.1
1615 * 00-00-5E-FE-xx-xx-xx-xx
1616 * - value 0
1617 * - XXX: already assigned to an address on the device
1618 */
1619 if (idev->rndid[0] == 0xfd &&
1620 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1621 (idev->rndid[7]&0x80))
1622 goto regen;
1623 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1624 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1625 goto regen;
1626 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1627 goto regen;
1628 }
1629
1630 return 0;
1631 }
1632
1633 static void ipv6_regen_rndid(unsigned long data)
1634 {
1635 struct inet6_dev *idev = (struct inet6_dev *) data;
1636 unsigned long expires;
1637
1638 rcu_read_lock_bh();
1639 write_lock_bh(&idev->lock);
1640
1641 if (idev->dead)
1642 goto out;
1643
1644 if (__ipv6_regen_rndid(idev) < 0)
1645 goto out;
1646
1647 expires = jiffies +
1648 idev->cnf.temp_prefered_lft * HZ -
1649 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1650 if (time_before(expires, jiffies)) {
1651 printk(KERN_WARNING
1652 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1653 idev->dev->name);
1654 goto out;
1655 }
1656
1657 if (!mod_timer(&idev->regen_timer, expires))
1658 in6_dev_hold(idev);
1659
1660 out:
1661 write_unlock_bh(&idev->lock);
1662 rcu_read_unlock_bh();
1663 in6_dev_put(idev);
1664 }
1665
1666 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1667 int ret = 0;
1668
1669 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1670 ret = __ipv6_regen_rndid(idev);
1671 return ret;
1672 }
1673 #endif
1674
1675 /*
1676 * Add prefix route.
1677 */
1678
1679 static void
1680 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1681 unsigned long expires, u32 flags)
1682 {
1683 struct fib6_config cfg = {
1684 .fc_table = RT6_TABLE_PREFIX,
1685 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1686 .fc_ifindex = dev->ifindex,
1687 .fc_expires = expires,
1688 .fc_dst_len = plen,
1689 .fc_flags = RTF_UP | flags,
1690 .fc_nlinfo.nl_net = dev_net(dev),
1691 .fc_protocol = RTPROT_KERNEL,
1692 };
1693
1694 ipv6_addr_copy(&cfg.fc_dst, pfx);
1695
1696 /* Prevent useless cloning on PtP SIT.
1697 This thing is done here expecting that the whole
1698 class of non-broadcast devices need not cloning.
1699 */
1700 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1701 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1702 cfg.fc_flags |= RTF_NONEXTHOP;
1703 #endif
1704
1705 ip6_route_add(&cfg);
1706 }
1707
1708 /* Create "default" multicast route to the interface */
1709
1710 static void addrconf_add_mroute(struct net_device *dev)
1711 {
1712 struct fib6_config cfg = {
1713 .fc_table = RT6_TABLE_LOCAL,
1714 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1715 .fc_ifindex = dev->ifindex,
1716 .fc_dst_len = 8,
1717 .fc_flags = RTF_UP,
1718 .fc_nlinfo.nl_net = dev_net(dev),
1719 };
1720
1721 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1722
1723 ip6_route_add(&cfg);
1724 }
1725
1726 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1727 static void sit_route_add(struct net_device *dev)
1728 {
1729 struct fib6_config cfg = {
1730 .fc_table = RT6_TABLE_MAIN,
1731 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1732 .fc_ifindex = dev->ifindex,
1733 .fc_dst_len = 96,
1734 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1735 .fc_nlinfo.nl_net = dev_net(dev),
1736 };
1737
1738 /* prefix length - 96 bits "::d.d.d.d" */
1739 ip6_route_add(&cfg);
1740 }
1741 #endif
1742
1743 static void addrconf_add_lroute(struct net_device *dev)
1744 {
1745 struct in6_addr addr;
1746
1747 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1748 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1749 }
1750
1751 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1752 {
1753 struct inet6_dev *idev;
1754
1755 ASSERT_RTNL();
1756
1757 if ((idev = ipv6_find_idev(dev)) == NULL)
1758 return NULL;
1759
1760 /* Add default multicast route */
1761 addrconf_add_mroute(dev);
1762
1763 /* Add link local route */
1764 addrconf_add_lroute(dev);
1765 return idev;
1766 }
1767
1768 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1769 {
1770 struct prefix_info *pinfo;
1771 __u32 valid_lft;
1772 __u32 prefered_lft;
1773 int addr_type;
1774 struct inet6_dev *in6_dev;
1775
1776 pinfo = (struct prefix_info *) opt;
1777
1778 if (len < sizeof(struct prefix_info)) {
1779 ADBG(("addrconf: prefix option too short\n"));
1780 return;
1781 }
1782
1783 /*
1784 * Validation checks ([ADDRCONF], page 19)
1785 */
1786
1787 addr_type = ipv6_addr_type(&pinfo->prefix);
1788
1789 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1790 return;
1791
1792 valid_lft = ntohl(pinfo->valid);
1793 prefered_lft = ntohl(pinfo->prefered);
1794
1795 if (prefered_lft > valid_lft) {
1796 if (net_ratelimit())
1797 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1798 return;
1799 }
1800
1801 in6_dev = in6_dev_get(dev);
1802
1803 if (in6_dev == NULL) {
1804 if (net_ratelimit())
1805 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1806 return;
1807 }
1808
1809 /*
1810 * Two things going on here:
1811 * 1) Add routes for on-link prefixes
1812 * 2) Configure prefixes with the auto flag set
1813 */
1814
1815 if (pinfo->onlink) {
1816 struct rt6_info *rt;
1817 unsigned long rt_expires;
1818
1819 /* Avoid arithmetic overflow. Really, we could
1820 * save rt_expires in seconds, likely valid_lft,
1821 * but it would require division in fib gc, that it
1822 * not good.
1823 */
1824 if (HZ > USER_HZ)
1825 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
1826 else
1827 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
1828
1829 if (addrconf_finite_timeout(rt_expires))
1830 rt_expires *= HZ;
1831
1832 rt = rt6_lookup(dev_net(dev), &pinfo->prefix, NULL,
1833 dev->ifindex, 1);
1834
1835 if (rt && addrconf_is_prefix_route(rt)) {
1836 /* Autoconf prefix route */
1837 if (valid_lft == 0) {
1838 ip6_del_rt(rt);
1839 rt = NULL;
1840 } else if (addrconf_finite_timeout(rt_expires)) {
1841 /* not infinity */
1842 rt->rt6i_expires = jiffies + rt_expires;
1843 rt->rt6i_flags |= RTF_EXPIRES;
1844 } else {
1845 rt->rt6i_flags &= ~RTF_EXPIRES;
1846 rt->rt6i_expires = 0;
1847 }
1848 } else if (valid_lft) {
1849 clock_t expires = 0;
1850 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
1851 if (addrconf_finite_timeout(rt_expires)) {
1852 /* not infinity */
1853 flags |= RTF_EXPIRES;
1854 expires = jiffies_to_clock_t(rt_expires);
1855 }
1856 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1857 dev, expires, flags);
1858 }
1859 if (rt)
1860 dst_release(&rt->u.dst);
1861 }
1862
1863 /* Try to figure out our local address for this prefix */
1864
1865 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1866 struct inet6_ifaddr * ifp;
1867 struct in6_addr addr;
1868 int create = 0, update_lft = 0;
1869 struct net *net = dev_net(dev);
1870
1871 if (pinfo->prefix_len == 64) {
1872 memcpy(&addr, &pinfo->prefix, 8);
1873 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1874 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1875 in6_dev_put(in6_dev);
1876 return;
1877 }
1878 goto ok;
1879 }
1880 if (net_ratelimit())
1881 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1882 pinfo->prefix_len);
1883 in6_dev_put(in6_dev);
1884 return;
1885
1886 ok:
1887
1888 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1889
1890 if (ifp == NULL && valid_lft) {
1891 int max_addresses = in6_dev->cnf.max_addresses;
1892 u32 addr_flags = 0;
1893
1894 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1895 if (in6_dev->cnf.optimistic_dad &&
1896 !net->ipv6.devconf_all->forwarding)
1897 addr_flags = IFA_F_OPTIMISTIC;
1898 #endif
1899
1900 /* Do not allow to create too much of autoconfigured
1901 * addresses; this would be too easy way to crash kernel.
1902 */
1903 if (!max_addresses ||
1904 ipv6_count_addresses(in6_dev) < max_addresses)
1905 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1906 addr_type&IPV6_ADDR_SCOPE_MASK,
1907 addr_flags);
1908
1909 if (!ifp || IS_ERR(ifp)) {
1910 in6_dev_put(in6_dev);
1911 return;
1912 }
1913
1914 update_lft = create = 1;
1915 ifp->cstamp = jiffies;
1916 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1917 }
1918
1919 if (ifp) {
1920 int flags;
1921 unsigned long now;
1922 #ifdef CONFIG_IPV6_PRIVACY
1923 struct inet6_ifaddr *ift;
1924 #endif
1925 u32 stored_lft;
1926
1927 /* update lifetime (RFC2462 5.5.3 e) */
1928 spin_lock(&ifp->lock);
1929 now = jiffies;
1930 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1931 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1932 else
1933 stored_lft = 0;
1934 if (!update_lft && stored_lft) {
1935 if (valid_lft > MIN_VALID_LIFETIME ||
1936 valid_lft > stored_lft)
1937 update_lft = 1;
1938 else if (stored_lft <= MIN_VALID_LIFETIME) {
1939 /* valid_lft <= stored_lft is always true */
1940 /* XXX: IPsec */
1941 update_lft = 0;
1942 } else {
1943 valid_lft = MIN_VALID_LIFETIME;
1944 if (valid_lft < prefered_lft)
1945 prefered_lft = valid_lft;
1946 update_lft = 1;
1947 }
1948 }
1949
1950 if (update_lft) {
1951 ifp->valid_lft = valid_lft;
1952 ifp->prefered_lft = prefered_lft;
1953 ifp->tstamp = now;
1954 flags = ifp->flags;
1955 ifp->flags &= ~IFA_F_DEPRECATED;
1956 spin_unlock(&ifp->lock);
1957
1958 if (!(flags&IFA_F_TENTATIVE))
1959 ipv6_ifa_notify(0, ifp);
1960 } else
1961 spin_unlock(&ifp->lock);
1962
1963 #ifdef CONFIG_IPV6_PRIVACY
1964 read_lock_bh(&in6_dev->lock);
1965 /* update all temporary addresses in the list */
1966 for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1967 /*
1968 * When adjusting the lifetimes of an existing
1969 * temporary address, only lower the lifetimes.
1970 * Implementations must not increase the
1971 * lifetimes of an existing temporary address
1972 * when processing a Prefix Information Option.
1973 */
1974 if (ifp != ift->ifpub)
1975 continue;
1976
1977 spin_lock(&ift->lock);
1978 flags = ift->flags;
1979 if (ift->valid_lft > valid_lft &&
1980 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1981 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1982 if (ift->prefered_lft > prefered_lft &&
1983 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1984 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1985 spin_unlock(&ift->lock);
1986 if (!(flags&IFA_F_TENTATIVE))
1987 ipv6_ifa_notify(0, ift);
1988 }
1989
1990 if (create && in6_dev->cnf.use_tempaddr > 0) {
1991 /*
1992 * When a new public address is created as described in [ADDRCONF],
1993 * also create a new temporary address.
1994 */
1995 read_unlock_bh(&in6_dev->lock);
1996 ipv6_create_tempaddr(ifp, NULL);
1997 } else {
1998 read_unlock_bh(&in6_dev->lock);
1999 }
2000 #endif
2001 in6_ifa_put(ifp);
2002 addrconf_verify(0);
2003 }
2004 }
2005 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2006 in6_dev_put(in6_dev);
2007 }
2008
2009 /*
2010 * Set destination address.
2011 * Special case for SIT interfaces where we create a new "virtual"
2012 * device.
2013 */
2014 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2015 {
2016 struct in6_ifreq ireq;
2017 struct net_device *dev;
2018 int err = -EINVAL;
2019
2020 rtnl_lock();
2021
2022 err = -EFAULT;
2023 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2024 goto err_exit;
2025
2026 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2027
2028 err = -ENODEV;
2029 if (dev == NULL)
2030 goto err_exit;
2031
2032 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2033 if (dev->type == ARPHRD_SIT) {
2034 const struct net_device_ops *ops = dev->netdev_ops;
2035 struct ifreq ifr;
2036 struct ip_tunnel_parm p;
2037
2038 err = -EADDRNOTAVAIL;
2039 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2040 goto err_exit;
2041
2042 memset(&p, 0, sizeof(p));
2043 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2044 p.iph.saddr = 0;
2045 p.iph.version = 4;
2046 p.iph.ihl = 5;
2047 p.iph.protocol = IPPROTO_IPV6;
2048 p.iph.ttl = 64;
2049 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2050
2051 if (ops->ndo_do_ioctl) {
2052 mm_segment_t oldfs = get_fs();
2053
2054 set_fs(KERNEL_DS);
2055 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2056 set_fs(oldfs);
2057 } else
2058 err = -EOPNOTSUPP;
2059
2060 if (err == 0) {
2061 err = -ENOBUFS;
2062 dev = __dev_get_by_name(net, p.name);
2063 if (!dev)
2064 goto err_exit;
2065 err = dev_open(dev);
2066 }
2067 }
2068 #endif
2069
2070 err_exit:
2071 rtnl_unlock();
2072 return err;
2073 }
2074
2075 /*
2076 * Manual configuration of address on an interface
2077 */
2078 static int inet6_addr_add(struct net *net, int ifindex, struct in6_addr *pfx,
2079 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
2080 __u32 valid_lft)
2081 {
2082 struct inet6_ifaddr *ifp;
2083 struct inet6_dev *idev;
2084 struct net_device *dev;
2085 int scope;
2086 u32 flags;
2087 clock_t expires;
2088 unsigned long timeout;
2089
2090 ASSERT_RTNL();
2091
2092 if (plen > 128)
2093 return -EINVAL;
2094
2095 /* check the lifetime */
2096 if (!valid_lft || prefered_lft > valid_lft)
2097 return -EINVAL;
2098
2099 dev = __dev_get_by_index(net, ifindex);
2100 if (!dev)
2101 return -ENODEV;
2102
2103 if ((idev = addrconf_add_dev(dev)) == NULL)
2104 return -ENOBUFS;
2105
2106 scope = ipv6_addr_scope(pfx);
2107
2108 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2109 if (addrconf_finite_timeout(timeout)) {
2110 expires = jiffies_to_clock_t(timeout * HZ);
2111 valid_lft = timeout;
2112 flags = RTF_EXPIRES;
2113 } else {
2114 expires = 0;
2115 flags = 0;
2116 ifa_flags |= IFA_F_PERMANENT;
2117 }
2118
2119 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2120 if (addrconf_finite_timeout(timeout)) {
2121 if (timeout == 0)
2122 ifa_flags |= IFA_F_DEPRECATED;
2123 prefered_lft = timeout;
2124 }
2125
2126 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2127
2128 if (!IS_ERR(ifp)) {
2129 spin_lock_bh(&ifp->lock);
2130 ifp->valid_lft = valid_lft;
2131 ifp->prefered_lft = prefered_lft;
2132 ifp->tstamp = jiffies;
2133 spin_unlock_bh(&ifp->lock);
2134
2135 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2136 expires, flags);
2137 /*
2138 * Note that section 3.1 of RFC 4429 indicates
2139 * that the Optimistic flag should not be set for
2140 * manually configured addresses
2141 */
2142 addrconf_dad_start(ifp, 0);
2143 in6_ifa_put(ifp);
2144 addrconf_verify(0);
2145 return 0;
2146 }
2147
2148 return PTR_ERR(ifp);
2149 }
2150
2151 static int inet6_addr_del(struct net *net, int ifindex, struct in6_addr *pfx,
2152 unsigned int plen)
2153 {
2154 struct inet6_ifaddr *ifp;
2155 struct inet6_dev *idev;
2156 struct net_device *dev;
2157
2158 if (plen > 128)
2159 return -EINVAL;
2160
2161 dev = __dev_get_by_index(net, ifindex);
2162 if (!dev)
2163 return -ENODEV;
2164
2165 if ((idev = __in6_dev_get(dev)) == NULL)
2166 return -ENXIO;
2167
2168 read_lock_bh(&idev->lock);
2169 for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
2170 if (ifp->prefix_len == plen &&
2171 ipv6_addr_equal(pfx, &ifp->addr)) {
2172 in6_ifa_hold(ifp);
2173 read_unlock_bh(&idev->lock);
2174
2175 ipv6_del_addr(ifp);
2176
2177 /* If the last address is deleted administratively,
2178 disable IPv6 on this interface.
2179 */
2180 if (idev->addr_list == NULL)
2181 addrconf_ifdown(idev->dev, 1);
2182 return 0;
2183 }
2184 }
2185 read_unlock_bh(&idev->lock);
2186 return -EADDRNOTAVAIL;
2187 }
2188
2189
2190 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2191 {
2192 struct in6_ifreq ireq;
2193 int err;
2194
2195 if (!capable(CAP_NET_ADMIN))
2196 return -EPERM;
2197
2198 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2199 return -EFAULT;
2200
2201 rtnl_lock();
2202 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2203 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2204 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2205 rtnl_unlock();
2206 return err;
2207 }
2208
2209 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2210 {
2211 struct in6_ifreq ireq;
2212 int err;
2213
2214 if (!capable(CAP_NET_ADMIN))
2215 return -EPERM;
2216
2217 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2218 return -EFAULT;
2219
2220 rtnl_lock();
2221 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2222 ireq.ifr6_prefixlen);
2223 rtnl_unlock();
2224 return err;
2225 }
2226
2227 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2228 int plen, int scope)
2229 {
2230 struct inet6_ifaddr *ifp;
2231
2232 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT);
2233 if (!IS_ERR(ifp)) {
2234 spin_lock_bh(&ifp->lock);
2235 ifp->flags &= ~IFA_F_TENTATIVE;
2236 spin_unlock_bh(&ifp->lock);
2237 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2238 in6_ifa_put(ifp);
2239 }
2240 }
2241
2242 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2243 static void sit_add_v4_addrs(struct inet6_dev *idev)
2244 {
2245 struct in6_addr addr;
2246 struct net_device *dev;
2247 struct net *net = dev_net(idev->dev);
2248 int scope;
2249
2250 ASSERT_RTNL();
2251
2252 memset(&addr, 0, sizeof(struct in6_addr));
2253 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2254
2255 if (idev->dev->flags&IFF_POINTOPOINT) {
2256 addr.s6_addr32[0] = htonl(0xfe800000);
2257 scope = IFA_LINK;
2258 } else {
2259 scope = IPV6_ADDR_COMPATv4;
2260 }
2261
2262 if (addr.s6_addr32[3]) {
2263 add_addr(idev, &addr, 128, scope);
2264 return;
2265 }
2266
2267 for_each_netdev(net, dev) {
2268 struct in_device * in_dev = __in_dev_get_rtnl(dev);
2269 if (in_dev && (dev->flags & IFF_UP)) {
2270 struct in_ifaddr * ifa;
2271
2272 int flag = scope;
2273
2274 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2275 int plen;
2276
2277 addr.s6_addr32[3] = ifa->ifa_local;
2278
2279 if (ifa->ifa_scope == RT_SCOPE_LINK)
2280 continue;
2281 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2282 if (idev->dev->flags&IFF_POINTOPOINT)
2283 continue;
2284 flag |= IFA_HOST;
2285 }
2286 if (idev->dev->flags&IFF_POINTOPOINT)
2287 plen = 64;
2288 else
2289 plen = 96;
2290
2291 add_addr(idev, &addr, plen, flag);
2292 }
2293 }
2294 }
2295 }
2296 #endif
2297
2298 static void init_loopback(struct net_device *dev)
2299 {
2300 struct inet6_dev *idev;
2301
2302 /* ::1 */
2303
2304 ASSERT_RTNL();
2305
2306 if ((idev = ipv6_find_idev(dev)) == NULL) {
2307 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2308 return;
2309 }
2310
2311 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2312 }
2313
2314 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2315 {
2316 struct inet6_ifaddr * ifp;
2317 u32 addr_flags = IFA_F_PERMANENT;
2318
2319 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2320 if (idev->cnf.optimistic_dad &&
2321 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2322 addr_flags |= IFA_F_OPTIMISTIC;
2323 #endif
2324
2325
2326 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2327 if (!IS_ERR(ifp)) {
2328 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2329 addrconf_dad_start(ifp, 0);
2330 in6_ifa_put(ifp);
2331 }
2332 }
2333
2334 static void addrconf_dev_config(struct net_device *dev)
2335 {
2336 struct in6_addr addr;
2337 struct inet6_dev * idev;
2338
2339 ASSERT_RTNL();
2340
2341 if ((dev->type != ARPHRD_ETHER) &&
2342 (dev->type != ARPHRD_FDDI) &&
2343 (dev->type != ARPHRD_IEEE802_TR) &&
2344 (dev->type != ARPHRD_ARCNET) &&
2345 (dev->type != ARPHRD_INFINIBAND)) {
2346 /* Alas, we support only Ethernet autoconfiguration. */
2347 return;
2348 }
2349
2350 idev = addrconf_add_dev(dev);
2351 if (idev == NULL)
2352 return;
2353
2354 memset(&addr, 0, sizeof(struct in6_addr));
2355 addr.s6_addr32[0] = htonl(0xFE800000);
2356
2357 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2358 addrconf_add_linklocal(idev, &addr);
2359 }
2360
2361 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2362 static void addrconf_sit_config(struct net_device *dev)
2363 {
2364 struct inet6_dev *idev;
2365
2366 ASSERT_RTNL();
2367
2368 /*
2369 * Configure the tunnel with one of our IPv4
2370 * addresses... we should configure all of
2371 * our v4 addrs in the tunnel
2372 */
2373
2374 if ((idev = ipv6_find_idev(dev)) == NULL) {
2375 printk(KERN_DEBUG "init sit: add_dev failed\n");
2376 return;
2377 }
2378
2379 if (dev->priv_flags & IFF_ISATAP) {
2380 struct in6_addr addr;
2381
2382 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2383 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2384 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2385 addrconf_add_linklocal(idev, &addr);
2386 return;
2387 }
2388
2389 sit_add_v4_addrs(idev);
2390
2391 if (dev->flags&IFF_POINTOPOINT) {
2392 addrconf_add_mroute(dev);
2393 addrconf_add_lroute(dev);
2394 } else
2395 sit_route_add(dev);
2396 }
2397 #endif
2398
2399 static inline int
2400 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2401 {
2402 struct in6_addr lladdr;
2403
2404 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2405 addrconf_add_linklocal(idev, &lladdr);
2406 return 0;
2407 }
2408 return -1;
2409 }
2410
2411 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2412 {
2413 struct net_device *link_dev;
2414 struct net *net = dev_net(idev->dev);
2415
2416 /* first try to inherit the link-local address from the link device */
2417 if (idev->dev->iflink &&
2418 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
2419 if (!ipv6_inherit_linklocal(idev, link_dev))
2420 return;
2421 }
2422 /* then try to inherit it from any device */
2423 for_each_netdev(net, link_dev) {
2424 if (!ipv6_inherit_linklocal(idev, link_dev))
2425 return;
2426 }
2427 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2428 }
2429
2430 /*
2431 * Autoconfigure tunnel with a link-local address so routing protocols,
2432 * DHCPv6, MLD etc. can be run over the virtual link
2433 */
2434
2435 static void addrconf_ip6_tnl_config(struct net_device *dev)
2436 {
2437 struct inet6_dev *idev;
2438
2439 ASSERT_RTNL();
2440
2441 if ((idev = addrconf_add_dev(dev)) == NULL) {
2442 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2443 return;
2444 }
2445 ip6_tnl_add_linklocal(idev);
2446 }
2447
2448 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2449 void * data)
2450 {
2451 struct net_device *dev = (struct net_device *) data;
2452 struct inet6_dev *idev = __in6_dev_get(dev);
2453 int run_pending = 0;
2454 int err;
2455
2456 switch(event) {
2457 case NETDEV_REGISTER:
2458 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2459 idev = ipv6_add_dev(dev);
2460 if (!idev)
2461 return notifier_from_errno(-ENOMEM);
2462 }
2463 break;
2464 case NETDEV_UP:
2465 case NETDEV_CHANGE:
2466 if (dev->flags & IFF_SLAVE)
2467 break;
2468
2469 if (event == NETDEV_UP) {
2470 if (!addrconf_qdisc_ok(dev)) {
2471 /* device is not ready yet. */
2472 printk(KERN_INFO
2473 "ADDRCONF(NETDEV_UP): %s: "
2474 "link is not ready\n",
2475 dev->name);
2476 break;
2477 }
2478
2479 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2480 idev = ipv6_add_dev(dev);
2481
2482 if (idev) {
2483 idev->if_flags |= IF_READY;
2484 run_pending = 1;
2485 }
2486 } else {
2487 if (!addrconf_qdisc_ok(dev)) {
2488 /* device is still not ready. */
2489 break;
2490 }
2491
2492 if (idev) {
2493 if (idev->if_flags & IF_READY) {
2494 /* device is already configured. */
2495 break;
2496 }
2497 idev->if_flags |= IF_READY;
2498 }
2499
2500 printk(KERN_INFO
2501 "ADDRCONF(NETDEV_CHANGE): %s: "
2502 "link becomes ready\n",
2503 dev->name);
2504
2505 run_pending = 1;
2506 }
2507
2508 switch(dev->type) {
2509 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2510 case ARPHRD_SIT:
2511 addrconf_sit_config(dev);
2512 break;
2513 #endif
2514 case ARPHRD_TUNNEL6:
2515 addrconf_ip6_tnl_config(dev);
2516 break;
2517 case ARPHRD_LOOPBACK:
2518 init_loopback(dev);
2519 break;
2520
2521 default:
2522 addrconf_dev_config(dev);
2523 break;
2524 }
2525 if (idev) {
2526 if (run_pending)
2527 addrconf_dad_run(idev);
2528
2529 /* If the MTU changed during the interface down, when the
2530 interface up, the changed MTU must be reflected in the
2531 idev as well as routers.
2532 */
2533 if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2534 rt6_mtu_change(dev, dev->mtu);
2535 idev->cnf.mtu6 = dev->mtu;
2536 }
2537 idev->tstamp = jiffies;
2538 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2539 /* If the changed mtu during down is lower than IPV6_MIN_MTU
2540 stop IPv6 on this interface.
2541 */
2542 if (dev->mtu < IPV6_MIN_MTU)
2543 addrconf_ifdown(dev, event != NETDEV_DOWN);
2544 }
2545 break;
2546
2547 case NETDEV_CHANGEMTU:
2548 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2549 rt6_mtu_change(dev, dev->mtu);
2550 idev->cnf.mtu6 = dev->mtu;
2551 break;
2552 }
2553
2554 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2555 idev = ipv6_add_dev(dev);
2556 if (idev)
2557 break;
2558 }
2559
2560 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2561
2562 case NETDEV_DOWN:
2563 case NETDEV_UNREGISTER:
2564 /*
2565 * Remove all addresses from this interface.
2566 */
2567 addrconf_ifdown(dev, event != NETDEV_DOWN);
2568 break;
2569
2570 case NETDEV_CHANGENAME:
2571 if (idev) {
2572 snmp6_unregister_dev(idev);
2573 addrconf_sysctl_unregister(idev);
2574 addrconf_sysctl_register(idev);
2575 err = snmp6_register_dev(idev);
2576 if (err)
2577 return notifier_from_errno(err);
2578 }
2579 break;
2580 }
2581
2582 return NOTIFY_OK;
2583 }
2584
2585 /*
2586 * addrconf module should be notified of a device going up
2587 */
2588 static struct notifier_block ipv6_dev_notf = {
2589 .notifier_call = addrconf_notify,
2590 .priority = 0
2591 };
2592
2593 static int addrconf_ifdown(struct net_device *dev, int how)
2594 {
2595 struct inet6_dev *idev;
2596 struct inet6_ifaddr *ifa, **bifa;
2597 struct net *net = dev_net(dev);
2598 int i;
2599
2600 ASSERT_RTNL();
2601
2602 if ((dev->flags & IFF_LOOPBACK) && how == 1)
2603 how = 0;
2604
2605 rt6_ifdown(net, dev);
2606 neigh_ifdown(&nd_tbl, dev);
2607
2608 idev = __in6_dev_get(dev);
2609 if (idev == NULL)
2610 return -ENODEV;
2611
2612 /* Step 1: remove reference to ipv6 device from parent device.
2613 Do not dev_put!
2614 */
2615 if (how) {
2616 idev->dead = 1;
2617
2618 /* protected by rtnl_lock */
2619 rcu_assign_pointer(dev->ip6_ptr, NULL);
2620
2621 /* Step 1.5: remove snmp6 entry */
2622 snmp6_unregister_dev(idev);
2623
2624 }
2625
2626 /* Step 2: clear hash table */
2627 for (i=0; i<IN6_ADDR_HSIZE; i++) {
2628 bifa = &inet6_addr_lst[i];
2629
2630 write_lock_bh(&addrconf_hash_lock);
2631 while ((ifa = *bifa) != NULL) {
2632 if (ifa->idev == idev) {
2633 *bifa = ifa->lst_next;
2634 ifa->lst_next = NULL;
2635 addrconf_del_timer(ifa);
2636 in6_ifa_put(ifa);
2637 continue;
2638 }
2639 bifa = &ifa->lst_next;
2640 }
2641 write_unlock_bh(&addrconf_hash_lock);
2642 }
2643
2644 write_lock_bh(&idev->lock);
2645
2646 /* Step 3: clear flags for stateless addrconf */
2647 if (!how)
2648 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2649
2650 /* Step 4: clear address list */
2651 #ifdef CONFIG_IPV6_PRIVACY
2652 if (how && del_timer(&idev->regen_timer))
2653 in6_dev_put(idev);
2654
2655 /* clear tempaddr list */
2656 while ((ifa = idev->tempaddr_list) != NULL) {
2657 idev->tempaddr_list = ifa->tmp_next;
2658 ifa->tmp_next = NULL;
2659 ifa->dead = 1;
2660 write_unlock_bh(&idev->lock);
2661 spin_lock_bh(&ifa->lock);
2662
2663 if (ifa->ifpub) {
2664 in6_ifa_put(ifa->ifpub);
2665 ifa->ifpub = NULL;
2666 }
2667 spin_unlock_bh(&ifa->lock);
2668 in6_ifa_put(ifa);
2669 write_lock_bh(&idev->lock);
2670 }
2671 #endif
2672 while ((ifa = idev->addr_list) != NULL) {
2673 idev->addr_list = ifa->if_next;
2674 ifa->if_next = NULL;
2675 ifa->dead = 1;
2676 addrconf_del_timer(ifa);
2677 write_unlock_bh(&idev->lock);
2678
2679 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2680 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2681 in6_ifa_put(ifa);
2682
2683 write_lock_bh(&idev->lock);
2684 }
2685 write_unlock_bh(&idev->lock);
2686
2687 /* Step 5: Discard multicast list */
2688
2689 if (how)
2690 ipv6_mc_destroy_dev(idev);
2691 else
2692 ipv6_mc_down(idev);
2693
2694 idev->tstamp = jiffies;
2695
2696 /* Shot the device (if unregistered) */
2697
2698 if (how) {
2699 addrconf_sysctl_unregister(idev);
2700 neigh_parms_release(&nd_tbl, idev->nd_parms);
2701 neigh_ifdown(&nd_tbl, dev);
2702 in6_dev_put(idev);
2703 }
2704 return 0;
2705 }
2706
2707 static void addrconf_rs_timer(unsigned long data)
2708 {
2709 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2710
2711 if (ifp->idev->cnf.forwarding)
2712 goto out;
2713
2714 if (ifp->idev->if_flags & IF_RA_RCVD) {
2715 /*
2716 * Announcement received after solicitation
2717 * was sent
2718 */
2719 goto out;
2720 }
2721
2722 spin_lock(&ifp->lock);
2723 if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2724 /* The wait after the last probe can be shorter */
2725 addrconf_mod_timer(ifp, AC_RS,
2726 (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2727 ifp->idev->cnf.rtr_solicit_delay :
2728 ifp->idev->cnf.rtr_solicit_interval);
2729 spin_unlock(&ifp->lock);
2730
2731 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2732 } else {
2733 spin_unlock(&ifp->lock);
2734 /*
2735 * Note: we do not support deprecated "all on-link"
2736 * assumption any longer.
2737 */
2738 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2739 ifp->idev->dev->name);
2740 }
2741
2742 out:
2743 in6_ifa_put(ifp);
2744 }
2745
2746 /*
2747 * Duplicate Address Detection
2748 */
2749 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2750 {
2751 unsigned long rand_num;
2752 struct inet6_dev *idev = ifp->idev;
2753
2754 if (ifp->flags & IFA_F_OPTIMISTIC)
2755 rand_num = 0;
2756 else
2757 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2758
2759 ifp->probes = idev->cnf.dad_transmits;
2760 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2761 }
2762
2763 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2764 {
2765 struct inet6_dev *idev = ifp->idev;
2766 struct net_device *dev = idev->dev;
2767
2768 addrconf_join_solict(dev, &ifp->addr);
2769
2770 net_srandom(ifp->addr.s6_addr32[3]);
2771
2772 read_lock_bh(&idev->lock);
2773 if (ifp->dead)
2774 goto out;
2775 spin_lock_bh(&ifp->lock);
2776
2777 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2778 idev->cnf.accept_dad < 1 ||
2779 !(ifp->flags&IFA_F_TENTATIVE) ||
2780 ifp->flags & IFA_F_NODAD) {
2781 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
2782 spin_unlock_bh(&ifp->lock);
2783 read_unlock_bh(&idev->lock);
2784
2785 addrconf_dad_completed(ifp);
2786 return;
2787 }
2788
2789 if (!(idev->if_flags & IF_READY)) {
2790 spin_unlock_bh(&ifp->lock);
2791 read_unlock_bh(&idev->lock);
2792 /*
2793 * If the defice is not ready:
2794 * - keep it tentative if it is a permanent address.
2795 * - otherwise, kill it.
2796 */
2797 in6_ifa_hold(ifp);
2798 addrconf_dad_stop(ifp);
2799 return;
2800 }
2801
2802 /*
2803 * Optimistic nodes can start receiving
2804 * Frames right away
2805 */
2806 if(ifp->flags & IFA_F_OPTIMISTIC)
2807 ip6_ins_rt(ifp->rt);
2808
2809 addrconf_dad_kick(ifp);
2810 spin_unlock_bh(&ifp->lock);
2811 out:
2812 read_unlock_bh(&idev->lock);
2813 }
2814
2815 static void addrconf_dad_timer(unsigned long data)
2816 {
2817 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2818 struct inet6_dev *idev = ifp->idev;
2819 struct in6_addr mcaddr;
2820
2821 read_lock_bh(&idev->lock);
2822 if (idev->dead) {
2823 read_unlock_bh(&idev->lock);
2824 goto out;
2825 }
2826 if (idev->cnf.accept_dad > 1 && idev->cnf.disable_ipv6) {
2827 read_unlock_bh(&idev->lock);
2828 addrconf_dad_failure(ifp);
2829 return;
2830 }
2831 spin_lock_bh(&ifp->lock);
2832 if (ifp->probes == 0) {
2833 /*
2834 * DAD was successful
2835 */
2836
2837 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
2838 spin_unlock_bh(&ifp->lock);
2839 read_unlock_bh(&idev->lock);
2840
2841 addrconf_dad_completed(ifp);
2842
2843 goto out;
2844 }
2845
2846 ifp->probes--;
2847 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2848 spin_unlock_bh(&ifp->lock);
2849 read_unlock_bh(&idev->lock);
2850
2851 /* send a neighbour solicitation for our addr */
2852 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2853 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
2854 out:
2855 in6_ifa_put(ifp);
2856 }
2857
2858 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2859 {
2860 struct net_device * dev = ifp->idev->dev;
2861
2862 /*
2863 * Configure the address for reception. Now it is valid.
2864 */
2865
2866 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2867
2868 /* If added prefix is link local and forwarding is off,
2869 start sending router solicitations.
2870 */
2871
2872 if (ifp->idev->cnf.forwarding == 0 &&
2873 ifp->idev->cnf.rtr_solicits > 0 &&
2874 (dev->flags&IFF_LOOPBACK) == 0 &&
2875 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2876 /*
2877 * If a host as already performed a random delay
2878 * [...] as part of DAD [...] there is no need
2879 * to delay again before sending the first RS
2880 */
2881 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2882
2883 spin_lock_bh(&ifp->lock);
2884 ifp->probes = 1;
2885 ifp->idev->if_flags |= IF_RS_SENT;
2886 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2887 spin_unlock_bh(&ifp->lock);
2888 }
2889 }
2890
2891 static void addrconf_dad_run(struct inet6_dev *idev) {
2892 struct inet6_ifaddr *ifp;
2893
2894 read_lock_bh(&idev->lock);
2895 for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2896 spin_lock_bh(&ifp->lock);
2897 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2898 spin_unlock_bh(&ifp->lock);
2899 continue;
2900 }
2901 spin_unlock_bh(&ifp->lock);
2902 addrconf_dad_kick(ifp);
2903 }
2904 read_unlock_bh(&idev->lock);
2905 }
2906
2907 #ifdef CONFIG_PROC_FS
2908 struct if6_iter_state {
2909 struct seq_net_private p;
2910 int bucket;
2911 };
2912
2913 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2914 {
2915 struct inet6_ifaddr *ifa = NULL;
2916 struct if6_iter_state *state = seq->private;
2917 struct net *net = seq_file_net(seq);
2918
2919 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2920 ifa = inet6_addr_lst[state->bucket];
2921
2922 while (ifa && !net_eq(dev_net(ifa->idev->dev), net))
2923 ifa = ifa->lst_next;
2924 if (ifa)
2925 break;
2926 }
2927 return ifa;
2928 }
2929
2930 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2931 {
2932 struct if6_iter_state *state = seq->private;
2933 struct net *net = seq_file_net(seq);
2934
2935 ifa = ifa->lst_next;
2936 try_again:
2937 if (ifa) {
2938 if (!net_eq(dev_net(ifa->idev->dev), net)) {
2939 ifa = ifa->lst_next;
2940 goto try_again;
2941 }
2942 }
2943
2944 if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2945 ifa = inet6_addr_lst[state->bucket];
2946 goto try_again;
2947 }
2948
2949 return ifa;
2950 }
2951
2952 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2953 {
2954 struct inet6_ifaddr *ifa = if6_get_first(seq);
2955
2956 if (ifa)
2957 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2958 --pos;
2959 return pos ? NULL : ifa;
2960 }
2961
2962 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2963 __acquires(addrconf_hash_lock)
2964 {
2965 read_lock_bh(&addrconf_hash_lock);
2966 return if6_get_idx(seq, *pos);
2967 }
2968
2969 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2970 {
2971 struct inet6_ifaddr *ifa;
2972
2973 ifa = if6_get_next(seq, v);
2974 ++*pos;
2975 return ifa;
2976 }
2977
2978 static void if6_seq_stop(struct seq_file *seq, void *v)
2979 __releases(addrconf_hash_lock)
2980 {
2981 read_unlock_bh(&addrconf_hash_lock);
2982 }
2983
2984 static int if6_seq_show(struct seq_file *seq, void *v)
2985 {
2986 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2987 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
2988 &ifp->addr,
2989 ifp->idev->dev->ifindex,
2990 ifp->prefix_len,
2991 ifp->scope,
2992 ifp->flags,
2993 ifp->idev->dev->name);
2994 return 0;
2995 }
2996
2997 static const struct seq_operations if6_seq_ops = {
2998 .start = if6_seq_start,
2999 .next = if6_seq_next,
3000 .show = if6_seq_show,
3001 .stop = if6_seq_stop,
3002 };
3003
3004 static int if6_seq_open(struct inode *inode, struct file *file)
3005 {
3006 return seq_open_net(inode, file, &if6_seq_ops,
3007 sizeof(struct if6_iter_state));
3008 }
3009
3010 static const struct file_operations if6_fops = {
3011 .owner = THIS_MODULE,
3012 .open = if6_seq_open,
3013 .read = seq_read,
3014 .llseek = seq_lseek,
3015 .release = seq_release_net,
3016 };
3017
3018 static int if6_proc_net_init(struct net *net)
3019 {
3020 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
3021 return -ENOMEM;
3022 return 0;
3023 }
3024
3025 static void if6_proc_net_exit(struct net *net)
3026 {
3027 proc_net_remove(net, "if_inet6");
3028 }
3029
3030 static struct pernet_operations if6_proc_net_ops = {
3031 .init = if6_proc_net_init,
3032 .exit = if6_proc_net_exit,
3033 };
3034
3035 int __init if6_proc_init(void)
3036 {
3037 return register_pernet_subsys(&if6_proc_net_ops);
3038 }
3039
3040 void if6_proc_exit(void)
3041 {
3042 unregister_pernet_subsys(&if6_proc_net_ops);
3043 }
3044 #endif /* CONFIG_PROC_FS */
3045
3046 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3047 /* Check if address is a home address configured on any interface. */
3048 int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr)
3049 {
3050 int ret = 0;
3051 struct inet6_ifaddr * ifp;
3052 u8 hash = ipv6_addr_hash(addr);
3053 read_lock_bh(&addrconf_hash_lock);
3054 for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) {
3055 if (!net_eq(dev_net(ifp->idev->dev), net))
3056 continue;
3057 if (ipv6_addr_equal(&ifp->addr, addr) &&
3058 (ifp->flags & IFA_F_HOMEADDRESS)) {
3059 ret = 1;
3060 break;
3061 }
3062 }
3063 read_unlock_bh(&addrconf_hash_lock);
3064 return ret;
3065 }
3066 #endif
3067
3068 /*
3069 * Periodic address status verification
3070 */
3071
3072 static void addrconf_verify(unsigned long foo)
3073 {
3074 struct inet6_ifaddr *ifp;
3075 unsigned long now, next;
3076 int i;
3077
3078 spin_lock_bh(&addrconf_verify_lock);
3079 now = jiffies;
3080 next = now + ADDR_CHECK_FREQUENCY;
3081
3082 del_timer(&addr_chk_timer);
3083
3084 for (i=0; i < IN6_ADDR_HSIZE; i++) {
3085
3086 restart:
3087 read_lock(&addrconf_hash_lock);
3088 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
3089 unsigned long age;
3090 #ifdef CONFIG_IPV6_PRIVACY
3091 unsigned long regen_advance;
3092 #endif
3093
3094 if (ifp->flags & IFA_F_PERMANENT)
3095 continue;
3096
3097 spin_lock(&ifp->lock);
3098 age = (now - ifp->tstamp) / HZ;
3099
3100 #ifdef CONFIG_IPV6_PRIVACY
3101 regen_advance = ifp->idev->cnf.regen_max_retry *
3102 ifp->idev->cnf.dad_transmits *
3103 ifp->idev->nd_parms->retrans_time / HZ;
3104 #endif
3105
3106 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3107 age >= ifp->valid_lft) {
3108 spin_unlock(&ifp->lock);
3109 in6_ifa_hold(ifp);
3110 read_unlock(&addrconf_hash_lock);
3111 ipv6_del_addr(ifp);
3112 goto restart;
3113 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3114 spin_unlock(&ifp->lock);
3115 continue;
3116 } else if (age >= ifp->prefered_lft) {
3117 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
3118 int deprecate = 0;
3119
3120 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3121 deprecate = 1;
3122 ifp->flags |= IFA_F_DEPRECATED;
3123 }
3124
3125 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3126 next = ifp->tstamp + ifp->valid_lft * HZ;
3127
3128 spin_unlock(&ifp->lock);
3129
3130 if (deprecate) {
3131 in6_ifa_hold(ifp);
3132 read_unlock(&addrconf_hash_lock);
3133
3134 ipv6_ifa_notify(0, ifp);
3135 in6_ifa_put(ifp);
3136 goto restart;
3137 }
3138 #ifdef CONFIG_IPV6_PRIVACY
3139 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3140 !(ifp->flags&IFA_F_TENTATIVE)) {
3141 if (age >= ifp->prefered_lft - regen_advance) {
3142 struct inet6_ifaddr *ifpub = ifp->ifpub;
3143 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3144 next = ifp->tstamp + ifp->prefered_lft * HZ;
3145 if (!ifp->regen_count && ifpub) {
3146 ifp->regen_count++;
3147 in6_ifa_hold(ifp);
3148 in6_ifa_hold(ifpub);
3149 spin_unlock(&ifp->lock);
3150 read_unlock(&addrconf_hash_lock);
3151 spin_lock(&ifpub->lock);
3152 ifpub->regen_count = 0;
3153 spin_unlock(&ifpub->lock);
3154 ipv6_create_tempaddr(ifpub, ifp);
3155 in6_ifa_put(ifpub);
3156 in6_ifa_put(ifp);
3157 goto restart;
3158 }
3159 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3160 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3161 spin_unlock(&ifp->lock);
3162 #endif
3163 } else {
3164 /* ifp->prefered_lft <= ifp->valid_lft */
3165 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3166 next = ifp->tstamp + ifp->prefered_lft * HZ;
3167 spin_unlock(&ifp->lock);
3168 }
3169 }
3170 read_unlock(&addrconf_hash_lock);
3171 }
3172
3173 addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
3174 add_timer(&addr_chk_timer);
3175 spin_unlock_bh(&addrconf_verify_lock);
3176 }
3177
3178 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3179 {
3180 struct in6_addr *pfx = NULL;
3181
3182 if (addr)
3183 pfx = nla_data(addr);
3184
3185 if (local) {
3186 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3187 pfx = NULL;
3188 else
3189 pfx = nla_data(local);
3190 }
3191
3192 return pfx;
3193 }
3194
3195 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3196 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3197 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3198 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3199 };
3200
3201 static int
3202 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3203 {
3204 struct net *net = sock_net(skb->sk);
3205 struct ifaddrmsg *ifm;
3206 struct nlattr *tb[IFA_MAX+1];
3207 struct in6_addr *pfx;
3208 int err;
3209
3210 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3211 if (err < 0)
3212 return err;
3213
3214 ifm = nlmsg_data(nlh);
3215 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3216 if (pfx == NULL)
3217 return -EINVAL;
3218
3219 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3220 }
3221
3222 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3223 u32 prefered_lft, u32 valid_lft)
3224 {
3225 u32 flags;
3226 clock_t expires;
3227 unsigned long timeout;
3228
3229 if (!valid_lft || (prefered_lft > valid_lft))
3230 return -EINVAL;
3231
3232 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3233 if (addrconf_finite_timeout(timeout)) {
3234 expires = jiffies_to_clock_t(timeout * HZ);
3235 valid_lft = timeout;
3236 flags = RTF_EXPIRES;
3237 } else {
3238 expires = 0;
3239 flags = 0;
3240 ifa_flags |= IFA_F_PERMANENT;
3241 }
3242
3243 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3244 if (addrconf_finite_timeout(timeout)) {
3245 if (timeout == 0)
3246 ifa_flags |= IFA_F_DEPRECATED;
3247 prefered_lft = timeout;
3248 }
3249
3250 spin_lock_bh(&ifp->lock);
3251 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3252 ifp->tstamp = jiffies;
3253 ifp->valid_lft = valid_lft;
3254 ifp->prefered_lft = prefered_lft;
3255
3256 spin_unlock_bh(&ifp->lock);
3257 if (!(ifp->flags&IFA_F_TENTATIVE))
3258 ipv6_ifa_notify(0, ifp);
3259
3260 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3261 expires, flags);
3262 addrconf_verify(0);
3263
3264 return 0;
3265 }
3266
3267 static int
3268 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3269 {
3270 struct net *net = sock_net(skb->sk);
3271 struct ifaddrmsg *ifm;
3272 struct nlattr *tb[IFA_MAX+1];
3273 struct in6_addr *pfx;
3274 struct inet6_ifaddr *ifa;
3275 struct net_device *dev;
3276 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3277 u8 ifa_flags;
3278 int err;
3279
3280 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3281 if (err < 0)
3282 return err;
3283
3284 ifm = nlmsg_data(nlh);
3285 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3286 if (pfx == NULL)
3287 return -EINVAL;
3288
3289 if (tb[IFA_CACHEINFO]) {
3290 struct ifa_cacheinfo *ci;
3291
3292 ci = nla_data(tb[IFA_CACHEINFO]);
3293 valid_lft = ci->ifa_valid;
3294 preferred_lft = ci->ifa_prefered;
3295 } else {
3296 preferred_lft = INFINITY_LIFE_TIME;
3297 valid_lft = INFINITY_LIFE_TIME;
3298 }
3299
3300 dev = __dev_get_by_index(net, ifm->ifa_index);
3301 if (dev == NULL)
3302 return -ENODEV;
3303
3304 /* We ignore other flags so far. */
3305 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3306
3307 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3308 if (ifa == NULL) {
3309 /*
3310 * It would be best to check for !NLM_F_CREATE here but
3311 * userspace alreay relies on not having to provide this.
3312 */
3313 return inet6_addr_add(net, ifm->ifa_index, pfx,
3314 ifm->ifa_prefixlen, ifa_flags,
3315 preferred_lft, valid_lft);
3316 }
3317
3318 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3319 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3320 err = -EEXIST;
3321 else
3322 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3323
3324 in6_ifa_put(ifa);
3325
3326 return err;
3327 }
3328
3329 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3330 u8 scope, int ifindex)
3331 {
3332 struct ifaddrmsg *ifm;
3333
3334 ifm = nlmsg_data(nlh);
3335 ifm->ifa_family = AF_INET6;
3336 ifm->ifa_prefixlen = prefixlen;
3337 ifm->ifa_flags = flags;
3338 ifm->ifa_scope = scope;
3339 ifm->ifa_index = ifindex;
3340 }
3341
3342 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3343 unsigned long tstamp, u32 preferred, u32 valid)
3344 {
3345 struct ifa_cacheinfo ci;
3346
3347 ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3348 + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3349 ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3350 + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3351 ci.ifa_prefered = preferred;
3352 ci.ifa_valid = valid;
3353
3354 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3355 }
3356
3357 static inline int rt_scope(int ifa_scope)
3358 {
3359 if (ifa_scope & IFA_HOST)
3360 return RT_SCOPE_HOST;
3361 else if (ifa_scope & IFA_LINK)
3362 return RT_SCOPE_LINK;
3363 else if (ifa_scope & IFA_SITE)
3364 return RT_SCOPE_SITE;
3365 else
3366 return RT_SCOPE_UNIVERSE;
3367 }
3368
3369 static inline int inet6_ifaddr_msgsize(void)
3370 {
3371 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3372 + nla_total_size(16) /* IFA_ADDRESS */
3373 + nla_total_size(sizeof(struct ifa_cacheinfo));
3374 }
3375
3376 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3377 u32 pid, u32 seq, int event, unsigned int flags)
3378 {
3379 struct nlmsghdr *nlh;
3380 u32 preferred, valid;
3381
3382 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3383 if (nlh == NULL)
3384 return -EMSGSIZE;
3385
3386 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3387 ifa->idev->dev->ifindex);
3388
3389 if (!(ifa->flags&IFA_F_PERMANENT)) {
3390 preferred = ifa->prefered_lft;
3391 valid = ifa->valid_lft;
3392 if (preferred != INFINITY_LIFE_TIME) {
3393 long tval = (jiffies - ifa->tstamp)/HZ;
3394 preferred -= tval;
3395 if (valid != INFINITY_LIFE_TIME)
3396 valid -= tval;
3397 }
3398 } else {
3399 preferred = INFINITY_LIFE_TIME;
3400 valid = INFINITY_LIFE_TIME;
3401 }
3402
3403 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3404 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3405 nlmsg_cancel(skb, nlh);
3406 return -EMSGSIZE;
3407 }
3408
3409 return nlmsg_end(skb, nlh);
3410 }
3411
3412 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3413 u32 pid, u32 seq, int event, u16 flags)
3414 {
3415 struct nlmsghdr *nlh;
3416 u8 scope = RT_SCOPE_UNIVERSE;
3417 int ifindex = ifmca->idev->dev->ifindex;
3418
3419 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3420 scope = RT_SCOPE_SITE;
3421
3422 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3423 if (nlh == NULL)
3424 return -EMSGSIZE;
3425
3426 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3427 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3428 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3429 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3430 nlmsg_cancel(skb, nlh);
3431 return -EMSGSIZE;
3432 }
3433
3434 return nlmsg_end(skb, nlh);
3435 }
3436
3437 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3438 u32 pid, u32 seq, int event, unsigned int flags)
3439 {
3440 struct nlmsghdr *nlh;
3441 u8 scope = RT_SCOPE_UNIVERSE;
3442 int ifindex = ifaca->aca_idev->dev->ifindex;
3443
3444 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3445 scope = RT_SCOPE_SITE;
3446
3447 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3448 if (nlh == NULL)
3449 return -EMSGSIZE;
3450
3451 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3452 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3453 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3454 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3455 nlmsg_cancel(skb, nlh);
3456 return -EMSGSIZE;
3457 }
3458
3459 return nlmsg_end(skb, nlh);
3460 }
3461
3462 enum addr_type_t
3463 {
3464 UNICAST_ADDR,
3465 MULTICAST_ADDR,
3466 ANYCAST_ADDR,
3467 };
3468
3469 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3470 enum addr_type_t type)
3471 {
3472 int idx, ip_idx;
3473 int s_idx, s_ip_idx;
3474 int err = 1;
3475 struct net_device *dev;
3476 struct inet6_dev *idev = NULL;
3477 struct inet6_ifaddr *ifa;
3478 struct ifmcaddr6 *ifmca;
3479 struct ifacaddr6 *ifaca;
3480 struct net *net = sock_net(skb->sk);
3481
3482 s_idx = cb->args[0];
3483 s_ip_idx = ip_idx = cb->args[1];
3484
3485 idx = 0;
3486 for_each_netdev(net, dev) {
3487 if (idx < s_idx)
3488 goto cont;
3489 if (idx > s_idx)
3490 s_ip_idx = 0;
3491 ip_idx = 0;
3492 if ((idev = in6_dev_get(dev)) == NULL)
3493 goto cont;
3494 read_lock_bh(&idev->lock);
3495 switch (type) {
3496 case UNICAST_ADDR:
3497 /* unicast address incl. temp addr */
3498 for (ifa = idev->addr_list; ifa;
3499 ifa = ifa->if_next, ip_idx++) {
3500 if (ip_idx < s_ip_idx)
3501 continue;
3502 err = inet6_fill_ifaddr(skb, ifa,
3503 NETLINK_CB(cb->skb).pid,
3504 cb->nlh->nlmsg_seq,
3505 RTM_NEWADDR,
3506 NLM_F_MULTI);
3507 }
3508 break;
3509 case MULTICAST_ADDR:
3510 /* multicast address */
3511 for (ifmca = idev->mc_list; ifmca;
3512 ifmca = ifmca->next, ip_idx++) {
3513 if (ip_idx < s_ip_idx)
3514 continue;
3515 err = inet6_fill_ifmcaddr(skb, ifmca,
3516 NETLINK_CB(cb->skb).pid,
3517 cb->nlh->nlmsg_seq,
3518 RTM_GETMULTICAST,
3519 NLM_F_MULTI);
3520 }
3521 break;
3522 case ANYCAST_ADDR:
3523 /* anycast address */
3524 for (ifaca = idev->ac_list; ifaca;
3525 ifaca = ifaca->aca_next, ip_idx++) {
3526 if (ip_idx < s_ip_idx)
3527 continue;
3528 err = inet6_fill_ifacaddr(skb, ifaca,
3529 NETLINK_CB(cb->skb).pid,
3530 cb->nlh->nlmsg_seq,
3531 RTM_GETANYCAST,
3532 NLM_F_MULTI);
3533 }
3534 break;
3535 default:
3536 break;
3537 }
3538 read_unlock_bh(&idev->lock);
3539 in6_dev_put(idev);
3540
3541 if (err <= 0)
3542 break;
3543 cont:
3544 idx++;
3545 }
3546 cb->args[0] = idx;
3547 cb->args[1] = ip_idx;
3548 return skb->len;
3549 }
3550
3551 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3552 {
3553 enum addr_type_t type = UNICAST_ADDR;
3554
3555 return inet6_dump_addr(skb, cb, type);
3556 }
3557
3558 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3559 {
3560 enum addr_type_t type = MULTICAST_ADDR;
3561
3562 return inet6_dump_addr(skb, cb, type);
3563 }
3564
3565
3566 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3567 {
3568 enum addr_type_t type = ANYCAST_ADDR;
3569
3570 return inet6_dump_addr(skb, cb, type);
3571 }
3572
3573 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3574 void *arg)
3575 {
3576 struct net *net = sock_net(in_skb->sk);
3577 struct ifaddrmsg *ifm;
3578 struct nlattr *tb[IFA_MAX+1];
3579 struct in6_addr *addr = NULL;
3580 struct net_device *dev = NULL;
3581 struct inet6_ifaddr *ifa;
3582 struct sk_buff *skb;
3583 int err;
3584
3585 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3586 if (err < 0)
3587 goto errout;
3588
3589 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3590 if (addr == NULL) {
3591 err = -EINVAL;
3592 goto errout;
3593 }
3594
3595 ifm = nlmsg_data(nlh);
3596 if (ifm->ifa_index)
3597 dev = __dev_get_by_index(net, ifm->ifa_index);
3598
3599 if ((ifa = ipv6_get_ifaddr(net, addr, dev, 1)) == NULL) {
3600 err = -EADDRNOTAVAIL;
3601 goto errout;
3602 }
3603
3604 if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) {
3605 err = -ENOBUFS;
3606 goto errout_ifa;
3607 }
3608
3609 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3610 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3611 if (err < 0) {
3612 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3613 WARN_ON(err == -EMSGSIZE);
3614 kfree_skb(skb);
3615 goto errout_ifa;
3616 }
3617 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
3618 errout_ifa:
3619 in6_ifa_put(ifa);
3620 errout:
3621 return err;
3622 }
3623
3624 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3625 {
3626 struct sk_buff *skb;
3627 struct net *net = dev_net(ifa->idev->dev);
3628 int err = -ENOBUFS;
3629
3630 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3631 if (skb == NULL)
3632 goto errout;
3633
3634 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3635 if (err < 0) {
3636 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3637 WARN_ON(err == -EMSGSIZE);
3638 kfree_skb(skb);
3639 goto errout;
3640 }
3641 err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3642 errout:
3643 if (err < 0)
3644 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3645 }
3646
3647 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3648 __s32 *array, int bytes)
3649 {
3650 BUG_ON(bytes < (DEVCONF_MAX * 4));
3651
3652 memset(array, 0, bytes);
3653 array[DEVCONF_FORWARDING] = cnf->forwarding;
3654 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3655 array[DEVCONF_MTU6] = cnf->mtu6;
3656 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3657 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3658 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3659 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3660 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3661 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3662 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3663 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3664 #ifdef CONFIG_IPV6_PRIVACY
3665 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3666 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3667 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3668 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3669 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3670 #endif
3671 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3672 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3673 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3674 #ifdef CONFIG_IPV6_ROUTER_PREF
3675 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3676 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
3677 #ifdef CONFIG_IPV6_ROUTE_INFO
3678 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3679 #endif
3680 #endif
3681 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3682 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3683 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3684 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3685 #endif
3686 #ifdef CONFIG_IPV6_MROUTE
3687 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
3688 #endif
3689 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
3690 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
3691 }
3692
3693 static inline size_t inet6_if_nlmsg_size(void)
3694 {
3695 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3696 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3697 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3698 + nla_total_size(4) /* IFLA_MTU */
3699 + nla_total_size(4) /* IFLA_LINK */
3700 + nla_total_size( /* IFLA_PROTINFO */
3701 nla_total_size(4) /* IFLA_INET6_FLAGS */
3702 + nla_total_size(sizeof(struct ifla_cacheinfo))
3703 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3704 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3705 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
3706 );
3707 }
3708
3709 static inline void __snmp6_fill_stats(u64 *stats, void **mib, int items,
3710 int bytes)
3711 {
3712 int i;
3713 int pad = bytes - sizeof(u64) * items;
3714 BUG_ON(pad < 0);
3715
3716 /* Use put_unaligned() because stats may not be aligned for u64. */
3717 put_unaligned(items, &stats[0]);
3718 for (i = 1; i < items; i++)
3719 put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3720
3721 memset(&stats[items], 0, pad);
3722 }
3723
3724 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3725 int bytes)
3726 {
3727 switch(attrtype) {
3728 case IFLA_INET6_STATS:
3729 __snmp6_fill_stats(stats, (void **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes);
3730 break;
3731 case IFLA_INET6_ICMP6STATS:
3732 __snmp6_fill_stats(stats, (void **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
3733 break;
3734 }
3735 }
3736
3737 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3738 u32 pid, u32 seq, int event, unsigned int flags)
3739 {
3740 struct net_device *dev = idev->dev;
3741 struct nlattr *nla;
3742 struct ifinfomsg *hdr;
3743 struct nlmsghdr *nlh;
3744 void *protoinfo;
3745 struct ifla_cacheinfo ci;
3746
3747 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3748 if (nlh == NULL)
3749 return -EMSGSIZE;
3750
3751 hdr = nlmsg_data(nlh);
3752 hdr->ifi_family = AF_INET6;
3753 hdr->__ifi_pad = 0;
3754 hdr->ifi_type = dev->type;
3755 hdr->ifi_index = dev->ifindex;
3756 hdr->ifi_flags = dev_get_flags(dev);
3757 hdr->ifi_change = 0;
3758
3759 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
3760
3761 if (dev->addr_len)
3762 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3763
3764 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
3765 if (dev->ifindex != dev->iflink)
3766 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
3767
3768 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3769 if (protoinfo == NULL)
3770 goto nla_put_failure;
3771
3772 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
3773
3774 ci.max_reasm_len = IPV6_MAXPLEN;
3775 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3776 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3777 ci.reachable_time = idev->nd_parms->reachable_time;
3778 ci.retrans_time = idev->nd_parms->retrans_time;
3779 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3780
3781 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3782 if (nla == NULL)
3783 goto nla_put_failure;
3784 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
3785
3786 /* XXX - MC not implemented */
3787
3788 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3789 if (nla == NULL)
3790 goto nla_put_failure;
3791 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3792
3793 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3794 if (nla == NULL)
3795 goto nla_put_failure;
3796 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
3797
3798 nla_nest_end(skb, protoinfo);
3799 return nlmsg_end(skb, nlh);
3800
3801 nla_put_failure:
3802 nlmsg_cancel(skb, nlh);
3803 return -EMSGSIZE;
3804 }
3805
3806 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3807 {
3808 struct net *net = sock_net(skb->sk);
3809 int idx, err;
3810 int s_idx = cb->args[0];
3811 struct net_device *dev;
3812 struct inet6_dev *idev;
3813
3814 read_lock(&dev_base_lock);
3815 idx = 0;
3816 for_each_netdev(net, dev) {
3817 if (idx < s_idx)
3818 goto cont;
3819 if ((idev = in6_dev_get(dev)) == NULL)
3820 goto cont;
3821 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
3822 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
3823 in6_dev_put(idev);
3824 if (err <= 0)
3825 break;
3826 cont:
3827 idx++;
3828 }
3829 read_unlock(&dev_base_lock);
3830 cb->args[0] = idx;
3831
3832 return skb->len;
3833 }
3834
3835 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3836 {
3837 struct sk_buff *skb;
3838 struct net *net = dev_net(idev->dev);
3839 int err = -ENOBUFS;
3840
3841 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
3842 if (skb == NULL)
3843 goto errout;
3844
3845 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
3846 if (err < 0) {
3847 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3848 WARN_ON(err == -EMSGSIZE);
3849 kfree_skb(skb);
3850 goto errout;
3851 }
3852 err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3853 errout:
3854 if (err < 0)
3855 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3856 }
3857
3858 static inline size_t inet6_prefix_nlmsg_size(void)
3859 {
3860 return NLMSG_ALIGN(sizeof(struct prefixmsg))
3861 + nla_total_size(sizeof(struct in6_addr))
3862 + nla_total_size(sizeof(struct prefix_cacheinfo));
3863 }
3864
3865 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
3866 struct prefix_info *pinfo, u32 pid, u32 seq,
3867 int event, unsigned int flags)
3868 {
3869 struct prefixmsg *pmsg;
3870 struct nlmsghdr *nlh;
3871 struct prefix_cacheinfo ci;
3872
3873 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
3874 if (nlh == NULL)
3875 return -EMSGSIZE;
3876
3877 pmsg = nlmsg_data(nlh);
3878 pmsg->prefix_family = AF_INET6;
3879 pmsg->prefix_pad1 = 0;
3880 pmsg->prefix_pad2 = 0;
3881 pmsg->prefix_ifindex = idev->dev->ifindex;
3882 pmsg->prefix_len = pinfo->prefix_len;
3883 pmsg->prefix_type = pinfo->type;
3884 pmsg->prefix_pad3 = 0;
3885 pmsg->prefix_flags = 0;
3886 if (pinfo->onlink)
3887 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3888 if (pinfo->autoconf)
3889 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3890
3891 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
3892
3893 ci.preferred_time = ntohl(pinfo->prefered);
3894 ci.valid_time = ntohl(pinfo->valid);
3895 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
3896
3897 return nlmsg_end(skb, nlh);
3898
3899 nla_put_failure:
3900 nlmsg_cancel(skb, nlh);
3901 return -EMSGSIZE;
3902 }
3903
3904 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
3905 struct prefix_info *pinfo)
3906 {
3907 struct sk_buff *skb;
3908 struct net *net = dev_net(idev->dev);
3909 int err = -ENOBUFS;
3910
3911 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
3912 if (skb == NULL)
3913 goto errout;
3914
3915 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
3916 if (err < 0) {
3917 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
3918 WARN_ON(err == -EMSGSIZE);
3919 kfree_skb(skb);
3920 goto errout;
3921 }
3922 err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
3923 errout:
3924 if (err < 0)
3925 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
3926 }
3927
3928 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3929 {
3930 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3931
3932 switch (event) {
3933 case RTM_NEWADDR:
3934 /*
3935 * If the address was optimistic
3936 * we inserted the route at the start of
3937 * our DAD process, so we don't need
3938 * to do it again
3939 */
3940 if (!(ifp->rt->rt6i_node))
3941 ip6_ins_rt(ifp->rt);
3942 if (ifp->idev->cnf.forwarding)
3943 addrconf_join_anycast(ifp);
3944 break;
3945 case RTM_DELADDR:
3946 if (ifp->idev->cnf.forwarding)
3947 addrconf_leave_anycast(ifp);
3948 addrconf_leave_solict(ifp->idev, &ifp->addr);
3949 dst_hold(&ifp->rt->u.dst);
3950 if (ip6_del_rt(ifp->rt))
3951 dst_free(&ifp->rt->u.dst);
3952 break;
3953 }
3954 }
3955
3956 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3957 {
3958 rcu_read_lock_bh();
3959 if (likely(ifp->idev->dead == 0))
3960 __ipv6_ifa_notify(event, ifp);
3961 rcu_read_unlock_bh();
3962 }
3963
3964 #ifdef CONFIG_SYSCTL
3965
3966 static
3967 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3968 void __user *buffer, size_t *lenp, loff_t *ppos)
3969 {
3970 int *valp = ctl->data;
3971 int val = *valp;
3972 int ret;
3973
3974 ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3975
3976 if (write)
3977 addrconf_fixup_forwarding(ctl, valp, val);
3978 return ret;
3979 }
3980
3981 static int addrconf_sysctl_forward_strategy(ctl_table *table,
3982 void __user *oldval,
3983 size_t __user *oldlenp,
3984 void __user *newval, size_t newlen)
3985 {
3986 int *valp = table->data;
3987 int val = *valp;
3988 int new;
3989
3990 if (!newval || !newlen)
3991 return 0;
3992 if (newlen != sizeof(int))
3993 return -EINVAL;
3994 if (get_user(new, (int __user *)newval))
3995 return -EFAULT;
3996 if (new == *valp)
3997 return 0;
3998 if (oldval && oldlenp) {
3999 size_t len;
4000 if (get_user(len, oldlenp))
4001 return -EFAULT;
4002 if (len) {
4003 if (len > table->maxlen)
4004 len = table->maxlen;
4005 if (copy_to_user(oldval, valp, len))
4006 return -EFAULT;
4007 if (put_user(len, oldlenp))
4008 return -EFAULT;
4009 }
4010 }
4011
4012 *valp = new;
4013 addrconf_fixup_forwarding(table, valp, val);
4014 return 1;
4015 }
4016
4017 static struct addrconf_sysctl_table
4018 {
4019 struct ctl_table_header *sysctl_header;
4020 ctl_table addrconf_vars[DEVCONF_MAX+1];
4021 char *dev_name;
4022 } addrconf_sysctl __read_mostly = {
4023 .sysctl_header = NULL,
4024 .addrconf_vars = {
4025 {
4026 .ctl_name = NET_IPV6_FORWARDING,
4027 .procname = "forwarding",
4028 .data = &ipv6_devconf.forwarding,
4029 .maxlen = sizeof(int),
4030 .mode = 0644,
4031 .proc_handler = addrconf_sysctl_forward,
4032 .strategy = addrconf_sysctl_forward_strategy,
4033 },
4034 {
4035 .ctl_name = NET_IPV6_HOP_LIMIT,
4036 .procname = "hop_limit",
4037 .data = &ipv6_devconf.hop_limit,
4038 .maxlen = sizeof(int),
4039 .mode = 0644,
4040 .proc_handler = proc_dointvec,
4041 },
4042 {
4043 .ctl_name = NET_IPV6_MTU,
4044 .procname = "mtu",
4045 .data = &ipv6_devconf.mtu6,
4046 .maxlen = sizeof(int),
4047 .mode = 0644,
4048 .proc_handler = proc_dointvec,
4049 },
4050 {
4051 .ctl_name = NET_IPV6_ACCEPT_RA,
4052 .procname = "accept_ra",
4053 .data = &ipv6_devconf.accept_ra,
4054 .maxlen = sizeof(int),
4055 .mode = 0644,
4056 .proc_handler = proc_dointvec,
4057 },
4058 {
4059 .ctl_name = NET_IPV6_ACCEPT_REDIRECTS,
4060 .procname = "accept_redirects",
4061 .data = &ipv6_devconf.accept_redirects,
4062 .maxlen = sizeof(int),
4063 .mode = 0644,
4064 .proc_handler = proc_dointvec,
4065 },
4066 {
4067 .ctl_name = NET_IPV6_AUTOCONF,
4068 .procname = "autoconf",
4069 .data = &ipv6_devconf.autoconf,
4070 .maxlen = sizeof(int),
4071 .mode = 0644,
4072 .proc_handler = proc_dointvec,
4073 },
4074 {
4075 .ctl_name = NET_IPV6_DAD_TRANSMITS,
4076 .procname = "dad_transmits",
4077 .data = &ipv6_devconf.dad_transmits,
4078 .maxlen = sizeof(int),
4079 .mode = 0644,
4080 .proc_handler = proc_dointvec,
4081 },
4082 {
4083 .ctl_name = NET_IPV6_RTR_SOLICITS,
4084 .procname = "router_solicitations",
4085 .data = &ipv6_devconf.rtr_solicits,
4086 .maxlen = sizeof(int),
4087 .mode = 0644,
4088 .proc_handler = proc_dointvec,
4089 },
4090 {
4091 .ctl_name = NET_IPV6_RTR_SOLICIT_INTERVAL,
4092 .procname = "router_solicitation_interval",
4093 .data = &ipv6_devconf.rtr_solicit_interval,
4094 .maxlen = sizeof(int),
4095 .mode = 0644,
4096 .proc_handler = proc_dointvec_jiffies,
4097 .strategy = sysctl_jiffies,
4098 },
4099 {
4100 .ctl_name = NET_IPV6_RTR_SOLICIT_DELAY,
4101 .procname = "router_solicitation_delay",
4102 .data = &ipv6_devconf.rtr_solicit_delay,
4103 .maxlen = sizeof(int),
4104 .mode = 0644,
4105 .proc_handler = proc_dointvec_jiffies,
4106 .strategy = sysctl_jiffies,
4107 },
4108 {
4109 .ctl_name = NET_IPV6_FORCE_MLD_VERSION,
4110 .procname = "force_mld_version",
4111 .data = &ipv6_devconf.force_mld_version,
4112 .maxlen = sizeof(int),
4113 .mode = 0644,
4114 .proc_handler = proc_dointvec,
4115 },
4116 #ifdef CONFIG_IPV6_PRIVACY
4117 {
4118 .ctl_name = NET_IPV6_USE_TEMPADDR,
4119 .procname = "use_tempaddr",
4120 .data = &ipv6_devconf.use_tempaddr,
4121 .maxlen = sizeof(int),
4122 .mode = 0644,
4123 .proc_handler = proc_dointvec,
4124 },
4125 {
4126 .ctl_name = NET_IPV6_TEMP_VALID_LFT,
4127 .procname = "temp_valid_lft",
4128 .data = &ipv6_devconf.temp_valid_lft,
4129 .maxlen = sizeof(int),
4130 .mode = 0644,
4131 .proc_handler = proc_dointvec,
4132 },
4133 {
4134 .ctl_name = NET_IPV6_TEMP_PREFERED_LFT,
4135 .procname = "temp_prefered_lft",
4136 .data = &ipv6_devconf.temp_prefered_lft,
4137 .maxlen = sizeof(int),
4138 .mode = 0644,
4139 .proc_handler = proc_dointvec,
4140 },
4141 {
4142 .ctl_name = NET_IPV6_REGEN_MAX_RETRY,
4143 .procname = "regen_max_retry",
4144 .data = &ipv6_devconf.regen_max_retry,
4145 .maxlen = sizeof(int),
4146 .mode = 0644,
4147 .proc_handler = proc_dointvec,
4148 },
4149 {
4150 .ctl_name = NET_IPV6_MAX_DESYNC_FACTOR,
4151 .procname = "max_desync_factor",
4152 .data = &ipv6_devconf.max_desync_factor,
4153 .maxlen = sizeof(int),
4154 .mode = 0644,
4155 .proc_handler = proc_dointvec,
4156 },
4157 #endif
4158 {
4159 .ctl_name = NET_IPV6_MAX_ADDRESSES,
4160 .procname = "max_addresses",
4161 .data = &ipv6_devconf.max_addresses,
4162 .maxlen = sizeof(int),
4163 .mode = 0644,
4164 .proc_handler = proc_dointvec,
4165 },
4166 {
4167 .ctl_name = NET_IPV6_ACCEPT_RA_DEFRTR,
4168 .procname = "accept_ra_defrtr",
4169 .data = &ipv6_devconf.accept_ra_defrtr,
4170 .maxlen = sizeof(int),
4171 .mode = 0644,
4172 .proc_handler = proc_dointvec,
4173 },
4174 {
4175 .ctl_name = NET_IPV6_ACCEPT_RA_PINFO,
4176 .procname = "accept_ra_pinfo",
4177 .data = &ipv6_devconf.accept_ra_pinfo,
4178 .maxlen = sizeof(int),
4179 .mode = 0644,
4180 .proc_handler = proc_dointvec,
4181 },
4182 #ifdef CONFIG_IPV6_ROUTER_PREF
4183 {
4184 .ctl_name = NET_IPV6_ACCEPT_RA_RTR_PREF,
4185 .procname = "accept_ra_rtr_pref",
4186 .data = &ipv6_devconf.accept_ra_rtr_pref,
4187 .maxlen = sizeof(int),
4188 .mode = 0644,
4189 .proc_handler = proc_dointvec,
4190 },
4191 {
4192 .ctl_name = NET_IPV6_RTR_PROBE_INTERVAL,
4193 .procname = "router_probe_interval",
4194 .data = &ipv6_devconf.rtr_probe_interval,
4195 .maxlen = sizeof(int),
4196 .mode = 0644,
4197 .proc_handler = proc_dointvec_jiffies,
4198 .strategy = sysctl_jiffies,
4199 },
4200 #ifdef CONFIG_IPV6_ROUTE_INFO
4201 {
4202 .ctl_name = NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN,
4203 .procname = "accept_ra_rt_info_max_plen",
4204 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4205 .maxlen = sizeof(int),
4206 .mode = 0644,
4207 .proc_handler = proc_dointvec,
4208 },
4209 #endif
4210 #endif
4211 {
4212 .ctl_name = NET_IPV6_PROXY_NDP,
4213 .procname = "proxy_ndp",
4214 .data = &ipv6_devconf.proxy_ndp,
4215 .maxlen = sizeof(int),
4216 .mode = 0644,
4217 .proc_handler = proc_dointvec,
4218 },
4219 {
4220 .ctl_name = NET_IPV6_ACCEPT_SOURCE_ROUTE,
4221 .procname = "accept_source_route",
4222 .data = &ipv6_devconf.accept_source_route,
4223 .maxlen = sizeof(int),
4224 .mode = 0644,
4225 .proc_handler = proc_dointvec,
4226 },
4227 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4228 {
4229 .ctl_name = CTL_UNNUMBERED,
4230 .procname = "optimistic_dad",
4231 .data = &ipv6_devconf.optimistic_dad,
4232 .maxlen = sizeof(int),
4233 .mode = 0644,
4234 .proc_handler = proc_dointvec,
4235
4236 },
4237 #endif
4238 #ifdef CONFIG_IPV6_MROUTE
4239 {
4240 .ctl_name = CTL_UNNUMBERED,
4241 .procname = "mc_forwarding",
4242 .data = &ipv6_devconf.mc_forwarding,
4243 .maxlen = sizeof(int),
4244 .mode = 0444,
4245 .proc_handler = proc_dointvec,
4246 },
4247 #endif
4248 {
4249 .ctl_name = CTL_UNNUMBERED,
4250 .procname = "disable_ipv6",
4251 .data = &ipv6_devconf.disable_ipv6,
4252 .maxlen = sizeof(int),
4253 .mode = 0644,
4254 .proc_handler = proc_dointvec,
4255 },
4256 {
4257 .ctl_name = CTL_UNNUMBERED,
4258 .procname = "accept_dad",
4259 .data = &ipv6_devconf.accept_dad,
4260 .maxlen = sizeof(int),
4261 .mode = 0644,
4262 .proc_handler = proc_dointvec,
4263 },
4264 {
4265 .ctl_name = 0, /* sentinel */
4266 }
4267 },
4268 };
4269
4270 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4271 int ctl_name, struct inet6_dev *idev, struct ipv6_devconf *p)
4272 {
4273 int i;
4274 struct addrconf_sysctl_table *t;
4275
4276 #define ADDRCONF_CTL_PATH_DEV 3
4277
4278 struct ctl_path addrconf_ctl_path[] = {
4279 { .procname = "net", .ctl_name = CTL_NET, },
4280 { .procname = "ipv6", .ctl_name = NET_IPV6, },
4281 { .procname = "conf", .ctl_name = NET_IPV6_CONF, },
4282 { /* to be set */ },
4283 { },
4284 };
4285
4286
4287 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4288 if (t == NULL)
4289 goto out;
4290
4291 for (i=0; t->addrconf_vars[i].data; i++) {
4292 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
4293 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4294 t->addrconf_vars[i].extra2 = net;
4295 }
4296
4297 /*
4298 * Make a copy of dev_name, because '.procname' is regarded as const
4299 * by sysctl and we wouldn't want anyone to change it under our feet
4300 * (see SIOCSIFNAME).
4301 */
4302 t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4303 if (!t->dev_name)
4304 goto free;
4305
4306 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
4307 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].ctl_name = ctl_name;
4308
4309 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
4310 t->addrconf_vars);
4311 if (t->sysctl_header == NULL)
4312 goto free_procname;
4313
4314 p->sysctl = t;
4315 return 0;
4316
4317 free_procname:
4318 kfree(t->dev_name);
4319 free:
4320 kfree(t);
4321 out:
4322 return -ENOBUFS;
4323 }
4324
4325 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4326 {
4327 struct addrconf_sysctl_table *t;
4328
4329 if (p->sysctl == NULL)
4330 return;
4331
4332 t = p->sysctl;
4333 p->sysctl = NULL;
4334 unregister_sysctl_table(t->sysctl_header);
4335 kfree(t->dev_name);
4336 kfree(t);
4337 }
4338
4339 static void addrconf_sysctl_register(struct inet6_dev *idev)
4340 {
4341 neigh_sysctl_register(idev->dev, idev->nd_parms, NET_IPV6,
4342 NET_IPV6_NEIGH, "ipv6",
4343 &ndisc_ifinfo_sysctl_change,
4344 ndisc_ifinfo_sysctl_strategy);
4345 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
4346 idev->dev->ifindex, idev, &idev->cnf);
4347 }
4348
4349 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
4350 {
4351 __addrconf_sysctl_unregister(&idev->cnf);
4352 neigh_sysctl_unregister(idev->nd_parms);
4353 }
4354
4355
4356 #endif
4357
4358 static int addrconf_init_net(struct net *net)
4359 {
4360 int err;
4361 struct ipv6_devconf *all, *dflt;
4362
4363 err = -ENOMEM;
4364 all = &ipv6_devconf;
4365 dflt = &ipv6_devconf_dflt;
4366
4367 if (net != &init_net) {
4368 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4369 if (all == NULL)
4370 goto err_alloc_all;
4371
4372 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4373 if (dflt == NULL)
4374 goto err_alloc_dflt;
4375 }
4376
4377 net->ipv6.devconf_all = all;
4378 net->ipv6.devconf_dflt = dflt;
4379
4380 #ifdef CONFIG_SYSCTL
4381 err = __addrconf_sysctl_register(net, "all", NET_PROTO_CONF_ALL,
4382 NULL, all);
4383 if (err < 0)
4384 goto err_reg_all;
4385
4386 err = __addrconf_sysctl_register(net, "default", NET_PROTO_CONF_DEFAULT,
4387 NULL, dflt);
4388 if (err < 0)
4389 goto err_reg_dflt;
4390 #endif
4391 return 0;
4392
4393 #ifdef CONFIG_SYSCTL
4394 err_reg_dflt:
4395 __addrconf_sysctl_unregister(all);
4396 err_reg_all:
4397 kfree(dflt);
4398 #endif
4399 err_alloc_dflt:
4400 kfree(all);
4401 err_alloc_all:
4402 return err;
4403 }
4404
4405 static void addrconf_exit_net(struct net *net)
4406 {
4407 #ifdef CONFIG_SYSCTL
4408 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4409 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4410 #endif
4411 if (net != &init_net) {
4412 kfree(net->ipv6.devconf_dflt);
4413 kfree(net->ipv6.devconf_all);
4414 }
4415 }
4416
4417 static struct pernet_operations addrconf_ops = {
4418 .init = addrconf_init_net,
4419 .exit = addrconf_exit_net,
4420 };
4421
4422 /*
4423 * Device notifier
4424 */
4425
4426 int register_inet6addr_notifier(struct notifier_block *nb)
4427 {
4428 return atomic_notifier_chain_register(&inet6addr_chain, nb);
4429 }
4430
4431 EXPORT_SYMBOL(register_inet6addr_notifier);
4432
4433 int unregister_inet6addr_notifier(struct notifier_block *nb)
4434 {
4435 return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
4436 }
4437
4438 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4439
4440 static void addrconf_net_exit(struct net *net)
4441 {
4442 struct net_device *dev;
4443
4444 rtnl_lock();
4445 /* clean dev list */
4446 for_each_netdev(net, dev) {
4447 if (__in6_dev_get(dev) == NULL)
4448 continue;
4449 addrconf_ifdown(dev, 1);
4450 }
4451 addrconf_ifdown(net->loopback_dev, 2);
4452 rtnl_unlock();
4453 }
4454
4455 static struct pernet_operations addrconf_net_ops = {
4456 .exit = addrconf_net_exit,
4457 };
4458
4459 /*
4460 * Init / cleanup code
4461 */
4462
4463 int __init addrconf_init(void)
4464 {
4465 int err;
4466
4467 if ((err = ipv6_addr_label_init()) < 0) {
4468 printk(KERN_CRIT "IPv6 Addrconf: cannot initialize default policy table: %d.\n",
4469 err);
4470 return err;
4471 }
4472
4473 register_pernet_subsys(&addrconf_ops);
4474
4475 /* The addrconf netdev notifier requires that loopback_dev
4476 * has it's ipv6 private information allocated and setup
4477 * before it can bring up and give link-local addresses
4478 * to other devices which are up.
4479 *
4480 * Unfortunately, loopback_dev is not necessarily the first
4481 * entry in the global dev_base list of net devices. In fact,
4482 * it is likely to be the very last entry on that list.
4483 * So this causes the notifier registry below to try and
4484 * give link-local addresses to all devices besides loopback_dev
4485 * first, then loopback_dev, which cases all the non-loopback_dev
4486 * devices to fail to get a link-local address.
4487 *
4488 * So, as a temporary fix, allocate the ipv6 structure for
4489 * loopback_dev first by hand.
4490 * Longer term, all of the dependencies ipv6 has upon the loopback
4491 * device and it being up should be removed.
4492 */
4493 rtnl_lock();
4494 if (!ipv6_add_dev(init_net.loopback_dev))
4495 err = -ENOMEM;
4496 rtnl_unlock();
4497 if (err)
4498 goto errlo;
4499
4500 err = register_pernet_device(&addrconf_net_ops);
4501 if (err)
4502 return err;
4503
4504 register_netdevice_notifier(&ipv6_dev_notf);
4505
4506 addrconf_verify(0);
4507
4508 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4509 if (err < 0)
4510 goto errout;
4511
4512 /* Only the first call to __rtnl_register can fail */
4513 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4514 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4515 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4516 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4517 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4518
4519 ipv6_addr_label_rtnl_register();
4520
4521 return 0;
4522 errout:
4523 unregister_netdevice_notifier(&ipv6_dev_notf);
4524 errlo:
4525 unregister_pernet_subsys(&addrconf_ops);
4526
4527 return err;
4528 }
4529
4530 void addrconf_cleanup(void)
4531 {
4532 struct inet6_ifaddr *ifa;
4533 int i;
4534
4535 unregister_netdevice_notifier(&ipv6_dev_notf);
4536 unregister_pernet_device(&addrconf_net_ops);
4537
4538 unregister_pernet_subsys(&addrconf_ops);
4539
4540 rtnl_lock();
4541
4542 /*
4543 * Check hash table.
4544 */
4545 write_lock_bh(&addrconf_hash_lock);
4546 for (i=0; i < IN6_ADDR_HSIZE; i++) {
4547 for (ifa=inet6_addr_lst[i]; ifa; ) {
4548 struct inet6_ifaddr *bifa;
4549
4550 bifa = ifa;
4551 ifa = ifa->lst_next;
4552 printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
4553 /* Do not free it; something is wrong.
4554 Now we can investigate it with debugger.
4555 */
4556 }
4557 }
4558 write_unlock_bh(&addrconf_hash_lock);
4559
4560 del_timer(&addr_chk_timer);
4561 rtnl_unlock();
4562
4563 unregister_pernet_subsys(&addrconf_net_ops);
4564 }
Support for the Chinese Samsung S3C2440 based development boards