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ARM: 7409/1: Do not call flush_cache_user_range with mmap_sem held
[linux/fpc-iii.git] / net / ipv6 / addrconf.c
blobbe29337ea3992299c3205e2c264c9ad1a0418107
1 /*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 */
14
15 /*
16 * Changes:
17 *
18 * Janos Farkas : delete timer on ifdown
19 * <chexum@bankinf.banki.hu>
20 * Andi Kleen : kill double kfree on module
21 * unload.
22 * Maciej W. Rozycki : FDDI support
23 * sekiya@USAGI : Don't send too many RS
24 * packets.
25 * yoshfuji@USAGI : Fixed interval between DAD
26 * packets.
27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
28 * address validation timer.
29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
30 * support.
31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
32 * address on a same interface.
33 * YOSHIFUJI Hideaki @USAGI : ARCnet support
34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
35 * seq_file.
36 * YOSHIFUJI Hideaki @USAGI : improved source address
37 * selection; consider scope,
38 * status etc.
39 */
40
41 #include <linux/errno.h>
42 #include <linux/types.h>
43 #include <linux/kernel.h>
44 #include <linux/socket.h>
45 #include <linux/sockios.h>
46 #include <linux/net.h>
47 #include <linux/in6.h>
48 #include <linux/netdevice.h>
49 #include <linux/if_addr.h>
50 #include <linux/if_arp.h>
51 #include <linux/if_arcnet.h>
52 #include <linux/if_infiniband.h>
53 #include <linux/route.h>
54 #include <linux/inetdevice.h>
55 #include <linux/init.h>
56 #include <linux/slab.h>
57 #ifdef CONFIG_SYSCTL
58 #include <linux/sysctl.h>
59 #endif
60 #include <linux/capability.h>
61 #include <linux/delay.h>
62 #include <linux/notifier.h>
63 #include <linux/string.h>
64
65 #include <net/net_namespace.h>
66 #include <net/sock.h>
67 #include <net/snmp.h>
68
69 #include <net/ipv6.h>
70 #include <net/protocol.h>
71 #include <net/ndisc.h>
72 #include <net/ip6_route.h>
73 #include <net/addrconf.h>
74 #include <net/tcp.h>
75 #include <net/ip.h>
76 #include <net/netlink.h>
77 #include <net/pkt_sched.h>
78 #include <linux/if_tunnel.h>
79 #include <linux/rtnetlink.h>
80
81 #ifdef CONFIG_IPV6_PRIVACY
82 #include <linux/random.h>
83 #endif
84
85 #include <linux/uaccess.h>
86 #include <asm/unaligned.h>
87
88 #include <linux/proc_fs.h>
89 #include <linux/seq_file.h>
90
91 /* Set to 3 to get tracing... */
92 #define ACONF_DEBUG 2
93
94 #if ACONF_DEBUG >= 3
95 #define ADBG(x) printk x
96 #else
97 #define ADBG(x)
98 #endif
99
100 #define INFINITY_LIFE_TIME 0xFFFFFFFF
101
102 static inline u32 cstamp_delta(unsigned long cstamp)
103 {
104 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
105 }
106
107 #define ADDRCONF_TIMER_FUZZ_MINUS (HZ > 50 ? HZ/50 : 1)
108 #define ADDRCONF_TIMER_FUZZ (HZ / 4)
109 #define ADDRCONF_TIMER_FUZZ_MAX (HZ)
110
111 #ifdef CONFIG_SYSCTL
112 static void addrconf_sysctl_register(struct inet6_dev *idev);
113 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
114 #else
115 static inline void addrconf_sysctl_register(struct inet6_dev *idev)
116 {
117 }
118
119 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
120 {
121 }
122 #endif
123
124 #ifdef CONFIG_IPV6_PRIVACY
125 static int __ipv6_regen_rndid(struct inet6_dev *idev);
126 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
127 static void ipv6_regen_rndid(unsigned long data);
128 #endif
129
130 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
131 static int ipv6_count_addresses(struct inet6_dev *idev);
132
133 /*
134 * Configured unicast address hash table
135 */
136 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
137 static DEFINE_SPINLOCK(addrconf_hash_lock);
138
139 static void addrconf_verify(unsigned long);
140
141 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
142 static DEFINE_SPINLOCK(addrconf_verify_lock);
143
144 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
145 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
146
147 static void addrconf_type_change(struct net_device *dev,
148 unsigned long event);
149 static int addrconf_ifdown(struct net_device *dev, int how);
150
151 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
152 static void addrconf_dad_timer(unsigned long data);
153 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
154 static void addrconf_dad_run(struct inet6_dev *idev);
155 static void addrconf_rs_timer(unsigned long data);
156 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
157 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
158
159 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
160 struct prefix_info *pinfo);
161 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
162 struct net_device *dev);
163
164 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
165
166 static struct ipv6_devconf ipv6_devconf __read_mostly = {
167 .forwarding = 0,
168 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
169 .mtu6 = IPV6_MIN_MTU,
170 .accept_ra = 1,
171 .accept_redirects = 1,
172 .autoconf = 1,
173 .force_mld_version = 0,
174 .dad_transmits = 1,
175 .rtr_solicits = MAX_RTR_SOLICITATIONS,
176 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
177 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
178 #ifdef CONFIG_IPV6_PRIVACY
179 .use_tempaddr = 0,
180 .temp_valid_lft = TEMP_VALID_LIFETIME,
181 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
182 .regen_max_retry = REGEN_MAX_RETRY,
183 .max_desync_factor = MAX_DESYNC_FACTOR,
184 #endif
185 .max_addresses = IPV6_MAX_ADDRESSES,
186 .accept_ra_defrtr = 1,
187 .accept_ra_pinfo = 1,
188 #ifdef CONFIG_IPV6_ROUTER_PREF
189 .accept_ra_rtr_pref = 1,
190 .rtr_probe_interval = 60 * HZ,
191 #ifdef CONFIG_IPV6_ROUTE_INFO
192 .accept_ra_rt_info_max_plen = 0,
193 #endif
194 #endif
195 .proxy_ndp = 0,
196 .accept_source_route = 0, /* we do not accept RH0 by default. */
197 .disable_ipv6 = 0,
198 .accept_dad = 1,
199 };
200
201 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
202 .forwarding = 0,
203 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
204 .mtu6 = IPV6_MIN_MTU,
205 .accept_ra = 1,
206 .accept_redirects = 1,
207 .autoconf = 1,
208 .dad_transmits = 1,
209 .rtr_solicits = MAX_RTR_SOLICITATIONS,
210 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
211 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
212 #ifdef CONFIG_IPV6_PRIVACY
213 .use_tempaddr = 0,
214 .temp_valid_lft = TEMP_VALID_LIFETIME,
215 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
216 .regen_max_retry = REGEN_MAX_RETRY,
217 .max_desync_factor = MAX_DESYNC_FACTOR,
218 #endif
219 .max_addresses = IPV6_MAX_ADDRESSES,
220 .accept_ra_defrtr = 1,
221 .accept_ra_pinfo = 1,
222 #ifdef CONFIG_IPV6_ROUTER_PREF
223 .accept_ra_rtr_pref = 1,
224 .rtr_probe_interval = 60 * HZ,
225 #ifdef CONFIG_IPV6_ROUTE_INFO
226 .accept_ra_rt_info_max_plen = 0,
227 #endif
228 #endif
229 .proxy_ndp = 0,
230 .accept_source_route = 0, /* we do not accept RH0 by default. */
231 .disable_ipv6 = 0,
232 .accept_dad = 1,
233 };
234
235 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
236 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
237 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
238 const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
239 const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
240
241 /* Check if a valid qdisc is available */
242 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
243 {
244 return !qdisc_tx_is_noop(dev);
245 }
246
247 /* Check if a route is valid prefix route */
248 static inline int addrconf_is_prefix_route(const struct rt6_info *rt)
249 {
250 return (rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0;
251 }
252
253 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
254 {
255 if (del_timer(&ifp->timer))
256 __in6_ifa_put(ifp);
257 }
258
259 enum addrconf_timer_t {
260 AC_NONE,
261 AC_DAD,
262 AC_RS,
263 };
264
265 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
266 enum addrconf_timer_t what,
267 unsigned long when)
268 {
269 if (!del_timer(&ifp->timer))
270 in6_ifa_hold(ifp);
271
272 switch (what) {
273 case AC_DAD:
274 ifp->timer.function = addrconf_dad_timer;
275 break;
276 case AC_RS:
277 ifp->timer.function = addrconf_rs_timer;
278 break;
279 default:
280 break;
281 }
282 ifp->timer.expires = jiffies + when;
283 add_timer(&ifp->timer);
284 }
285
286 static int snmp6_alloc_dev(struct inet6_dev *idev)
287 {
288 if (snmp_mib_init((void __percpu **)idev->stats.ipv6,
289 sizeof(struct ipstats_mib),
290 __alignof__(struct ipstats_mib)) < 0)
291 goto err_ip;
292 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
293 GFP_KERNEL);
294 if (!idev->stats.icmpv6dev)
295 goto err_icmp;
296 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
297 GFP_KERNEL);
298 if (!idev->stats.icmpv6msgdev)
299 goto err_icmpmsg;
300
301 return 0;
302
303 err_icmpmsg:
304 kfree(idev->stats.icmpv6dev);
305 err_icmp:
306 snmp_mib_free((void __percpu **)idev->stats.ipv6);
307 err_ip:
308 return -ENOMEM;
309 }
310
311 static void snmp6_free_dev(struct inet6_dev *idev)
312 {
313 kfree(idev->stats.icmpv6msgdev);
314 kfree(idev->stats.icmpv6dev);
315 snmp_mib_free((void __percpu **)idev->stats.ipv6);
316 }
317
318 /* Nobody refers to this device, we may destroy it. */
319
320 void in6_dev_finish_destroy(struct inet6_dev *idev)
321 {
322 struct net_device *dev = idev->dev;
323
324 WARN_ON(!list_empty(&idev->addr_list));
325 WARN_ON(idev->mc_list != NULL);
326
327 #ifdef NET_REFCNT_DEBUG
328 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
329 #endif
330 dev_put(dev);
331 if (!idev->dead) {
332 pr_warning("Freeing alive inet6 device %p\n", idev);
333 return;
334 }
335 snmp6_free_dev(idev);
336 kfree_rcu(idev, rcu);
337 }
338
339 EXPORT_SYMBOL(in6_dev_finish_destroy);
340
341 static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
342 {
343 struct inet6_dev *ndev;
344
345 ASSERT_RTNL();
346
347 if (dev->mtu < IPV6_MIN_MTU)
348 return NULL;
349
350 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
351
352 if (ndev == NULL)
353 return NULL;
354
355 rwlock_init(&ndev->lock);
356 ndev->dev = dev;
357 INIT_LIST_HEAD(&ndev->addr_list);
358
359 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
360 ndev->cnf.mtu6 = dev->mtu;
361 ndev->cnf.sysctl = NULL;
362 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
363 if (ndev->nd_parms == NULL) {
364 kfree(ndev);
365 return NULL;
366 }
367 if (ndev->cnf.forwarding)
368 dev_disable_lro(dev);
369 /* We refer to the device */
370 dev_hold(dev);
371
372 if (snmp6_alloc_dev(ndev) < 0) {
373 ADBG((KERN_WARNING
374 "%s(): cannot allocate memory for statistics; dev=%s.\n",
375 __func__, dev->name));
376 neigh_parms_release(&nd_tbl, ndev->nd_parms);
377 ndev->dead = 1;
378 in6_dev_finish_destroy(ndev);
379 return NULL;
380 }
381
382 if (snmp6_register_dev(ndev) < 0) {
383 ADBG((KERN_WARNING
384 "%s(): cannot create /proc/net/dev_snmp6/%s\n",
385 __func__, dev->name));
386 neigh_parms_release(&nd_tbl, ndev->nd_parms);
387 ndev->dead = 1;
388 in6_dev_finish_destroy(ndev);
389 return NULL;
390 }
391
392 /* One reference from device. We must do this before
393 * we invoke __ipv6_regen_rndid().
394 */
395 in6_dev_hold(ndev);
396
397 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
398 ndev->cnf.accept_dad = -1;
399
400 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
401 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
402 printk(KERN_INFO
403 "%s: Disabled Multicast RS\n",
404 dev->name);
405 ndev->cnf.rtr_solicits = 0;
406 }
407 #endif
408
409 #ifdef CONFIG_IPV6_PRIVACY
410 INIT_LIST_HEAD(&ndev->tempaddr_list);
411 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
412 if ((dev->flags&IFF_LOOPBACK) ||
413 dev->type == ARPHRD_TUNNEL ||
414 dev->type == ARPHRD_TUNNEL6 ||
415 dev->type == ARPHRD_SIT ||
416 dev->type == ARPHRD_NONE) {
417 ndev->cnf.use_tempaddr = -1;
418 } else {
419 in6_dev_hold(ndev);
420 ipv6_regen_rndid((unsigned long) ndev);
421 }
422 #endif
423
424 if (netif_running(dev) && addrconf_qdisc_ok(dev))
425 ndev->if_flags |= IF_READY;
426
427 ipv6_mc_init_dev(ndev);
428 ndev->tstamp = jiffies;
429 addrconf_sysctl_register(ndev);
430 /* protected by rtnl_lock */
431 rcu_assign_pointer(dev->ip6_ptr, ndev);
432
433 /* Join all-node multicast group */
434 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
435
436 /* Join all-router multicast group if forwarding is set */
437 if (ndev->cnf.forwarding && dev && (dev->flags & IFF_MULTICAST))
438 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
439
440 return ndev;
441 }
442
443 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
444 {
445 struct inet6_dev *idev;
446
447 ASSERT_RTNL();
448
449 idev = __in6_dev_get(dev);
450 if (!idev) {
451 idev = ipv6_add_dev(dev);
452 if (!idev)
453 return NULL;
454 }
455
456 if (dev->flags&IFF_UP)
457 ipv6_mc_up(idev);
458 return idev;
459 }
460
461 #ifdef CONFIG_SYSCTL
462 static void dev_forward_change(struct inet6_dev *idev)
463 {
464 struct net_device *dev;
465 struct inet6_ifaddr *ifa;
466
467 if (!idev)
468 return;
469 dev = idev->dev;
470 if (idev->cnf.forwarding)
471 dev_disable_lro(dev);
472 if (dev && (dev->flags & IFF_MULTICAST)) {
473 if (idev->cnf.forwarding)
474 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
475 else
476 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
477 }
478
479 list_for_each_entry(ifa, &idev->addr_list, if_list) {
480 if (ifa->flags&IFA_F_TENTATIVE)
481 continue;
482 if (idev->cnf.forwarding)
483 addrconf_join_anycast(ifa);
484 else
485 addrconf_leave_anycast(ifa);
486 }
487 }
488
489
490 static void addrconf_forward_change(struct net *net, __s32 newf)
491 {
492 struct net_device *dev;
493 struct inet6_dev *idev;
494
495 rcu_read_lock();
496 for_each_netdev_rcu(net, dev) {
497 idev = __in6_dev_get(dev);
498 if (idev) {
499 int changed = (!idev->cnf.forwarding) ^ (!newf);
500 idev->cnf.forwarding = newf;
501 if (changed)
502 dev_forward_change(idev);
503 }
504 }
505 rcu_read_unlock();
506 }
507
508 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old)
509 {
510 struct net *net;
511
512 net = (struct net *)table->extra2;
513 if (p == &net->ipv6.devconf_dflt->forwarding)
514 return 0;
515
516 if (!rtnl_trylock()) {
517 /* Restore the original values before restarting */
518 *p = old;
519 return restart_syscall();
520 }
521
522 if (p == &net->ipv6.devconf_all->forwarding) {
523 __s32 newf = net->ipv6.devconf_all->forwarding;
524 net->ipv6.devconf_dflt->forwarding = newf;
525 addrconf_forward_change(net, newf);
526 } else if ((!*p) ^ (!old))
527 dev_forward_change((struct inet6_dev *)table->extra1);
528 rtnl_unlock();
529
530 if (*p)
531 rt6_purge_dflt_routers(net);
532 return 1;
533 }
534 #endif
535
536 /* Nobody refers to this ifaddr, destroy it */
537 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
538 {
539 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
540
541 #ifdef NET_REFCNT_DEBUG
542 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
543 #endif
544
545 in6_dev_put(ifp->idev);
546
547 if (del_timer(&ifp->timer))
548 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp);
549
550 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
551 pr_warning("Freeing alive inet6 address %p\n", ifp);
552 return;
553 }
554 dst_release(&ifp->rt->dst);
555
556 kfree_rcu(ifp, rcu);
557 }
558
559 static void
560 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
561 {
562 struct list_head *p;
563 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
564
565 /*
566 * Each device address list is sorted in order of scope -
567 * global before linklocal.
568 */
569 list_for_each(p, &idev->addr_list) {
570 struct inet6_ifaddr *ifa
571 = list_entry(p, struct inet6_ifaddr, if_list);
572 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
573 break;
574 }
575
576 list_add_tail(&ifp->if_list, p);
577 }
578
579 static u32 ipv6_addr_hash(const struct in6_addr *addr)
580 {
581 /*
582 * We perform the hash function over the last 64 bits of the address
583 * This will include the IEEE address token on links that support it.
584 */
585 return jhash_2words((__force u32)addr->s6_addr32[2],
586 (__force u32)addr->s6_addr32[3], 0)
587 & (IN6_ADDR_HSIZE - 1);
588 }
589
590 /* On success it returns ifp with increased reference count */
591
592 static struct inet6_ifaddr *
593 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
594 int scope, u32 flags)
595 {
596 struct inet6_ifaddr *ifa = NULL;
597 struct rt6_info *rt;
598 unsigned int hash;
599 int err = 0;
600 int addr_type = ipv6_addr_type(addr);
601
602 if (addr_type == IPV6_ADDR_ANY ||
603 addr_type & IPV6_ADDR_MULTICAST ||
604 (!(idev->dev->flags & IFF_LOOPBACK) &&
605 addr_type & IPV6_ADDR_LOOPBACK))
606 return ERR_PTR(-EADDRNOTAVAIL);
607
608 rcu_read_lock_bh();
609 if (idev->dead) {
610 err = -ENODEV; /*XXX*/
611 goto out2;
612 }
613
614 if (idev->cnf.disable_ipv6) {
615 err = -EACCES;
616 goto out2;
617 }
618
619 spin_lock(&addrconf_hash_lock);
620
621 /* Ignore adding duplicate addresses on an interface */
622 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
623 ADBG(("ipv6_add_addr: already assigned\n"));
624 err = -EEXIST;
625 goto out;
626 }
627
628 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
629
630 if (ifa == NULL) {
631 ADBG(("ipv6_add_addr: malloc failed\n"));
632 err = -ENOBUFS;
633 goto out;
634 }
635
636 rt = addrconf_dst_alloc(idev, addr, 0);
637 if (IS_ERR(rt)) {
638 err = PTR_ERR(rt);
639 goto out;
640 }
641
642 ipv6_addr_copy(&ifa->addr, addr);
643
644 spin_lock_init(&ifa->lock);
645 spin_lock_init(&ifa->state_lock);
646 init_timer(&ifa->timer);
647 INIT_HLIST_NODE(&ifa->addr_lst);
648 ifa->timer.data = (unsigned long) ifa;
649 ifa->scope = scope;
650 ifa->prefix_len = pfxlen;
651 ifa->flags = flags | IFA_F_TENTATIVE;
652 ifa->cstamp = ifa->tstamp = jiffies;
653
654 ifa->rt = rt;
655
656 /*
657 * part one of RFC 4429, section 3.3
658 * We should not configure an address as
659 * optimistic if we do not yet know the link
660 * layer address of our nexhop router
661 */
662
663 if (dst_get_neighbour_raw(&rt->dst) == NULL)
664 ifa->flags &= ~IFA_F_OPTIMISTIC;
665
666 ifa->idev = idev;
667 in6_dev_hold(idev);
668 /* For caller */
669 in6_ifa_hold(ifa);
670
671 /* Add to big hash table */
672 hash = ipv6_addr_hash(addr);
673
674 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
675 spin_unlock(&addrconf_hash_lock);
676
677 write_lock(&idev->lock);
678 /* Add to inet6_dev unicast addr list. */
679 ipv6_link_dev_addr(idev, ifa);
680
681 #ifdef CONFIG_IPV6_PRIVACY
682 if (ifa->flags&IFA_F_TEMPORARY) {
683 list_add(&ifa->tmp_list, &idev->tempaddr_list);
684 in6_ifa_hold(ifa);
685 }
686 #endif
687
688 in6_ifa_hold(ifa);
689 write_unlock(&idev->lock);
690 out2:
691 rcu_read_unlock_bh();
692
693 if (likely(err == 0))
694 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
695 else {
696 kfree(ifa);
697 ifa = ERR_PTR(err);
698 }
699
700 return ifa;
701 out:
702 spin_unlock(&addrconf_hash_lock);
703 goto out2;
704 }
705
706 /* This function wants to get referenced ifp and releases it before return */
707
708 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
709 {
710 struct inet6_ifaddr *ifa, *ifn;
711 struct inet6_dev *idev = ifp->idev;
712 int state;
713 int deleted = 0, onlink = 0;
714 unsigned long expires = jiffies;
715
716 spin_lock_bh(&ifp->state_lock);
717 state = ifp->state;
718 ifp->state = INET6_IFADDR_STATE_DEAD;
719 spin_unlock_bh(&ifp->state_lock);
720
721 if (state == INET6_IFADDR_STATE_DEAD)
722 goto out;
723
724 spin_lock_bh(&addrconf_hash_lock);
725 hlist_del_init_rcu(&ifp->addr_lst);
726 spin_unlock_bh(&addrconf_hash_lock);
727
728 write_lock_bh(&idev->lock);
729 #ifdef CONFIG_IPV6_PRIVACY
730 if (ifp->flags&IFA_F_TEMPORARY) {
731 list_del(&ifp->tmp_list);
732 if (ifp->ifpub) {
733 in6_ifa_put(ifp->ifpub);
734 ifp->ifpub = NULL;
735 }
736 __in6_ifa_put(ifp);
737 }
738 #endif
739
740 list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) {
741 if (ifa == ifp) {
742 list_del_init(&ifp->if_list);
743 __in6_ifa_put(ifp);
744
745 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
746 break;
747 deleted = 1;
748 continue;
749 } else if (ifp->flags & IFA_F_PERMANENT) {
750 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
751 ifp->prefix_len)) {
752 if (ifa->flags & IFA_F_PERMANENT) {
753 onlink = 1;
754 if (deleted)
755 break;
756 } else {
757 unsigned long lifetime;
758
759 if (!onlink)
760 onlink = -1;
761
762 spin_lock(&ifa->lock);
763
764 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
765 /*
766 * Note: Because this address is
767 * not permanent, lifetime <
768 * LONG_MAX / HZ here.
769 */
770 if (time_before(expires,
771 ifa->tstamp + lifetime * HZ))
772 expires = ifa->tstamp + lifetime * HZ;
773 spin_unlock(&ifa->lock);
774 }
775 }
776 }
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->dst);
818 }
819
820 /* clean up prefsrc entries */
821 rt6_remove_prefsrc(ifp);
822 out:
823 in6_ifa_put(ifp);
824 }
825
826 #ifdef CONFIG_IPV6_PRIVACY
827 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
828 {
829 struct inet6_dev *idev = ifp->idev;
830 struct in6_addr addr, *tmpaddr;
831 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp, age;
832 unsigned long regen_advance;
833 int tmp_plen;
834 int ret = 0;
835 int max_addresses;
836 u32 addr_flags;
837
838 write_lock(&idev->lock);
839 if (ift) {
840 spin_lock_bh(&ift->lock);
841 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
842 spin_unlock_bh(&ift->lock);
843 tmpaddr = &addr;
844 } else {
845 tmpaddr = NULL;
846 }
847 retry:
848 in6_dev_hold(idev);
849 if (idev->cnf.use_tempaddr <= 0) {
850 write_unlock(&idev->lock);
851 printk(KERN_INFO
852 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
853 in6_dev_put(idev);
854 ret = -1;
855 goto out;
856 }
857 spin_lock_bh(&ifp->lock);
858 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
859 idev->cnf.use_tempaddr = -1; /*XXX*/
860 spin_unlock_bh(&ifp->lock);
861 write_unlock(&idev->lock);
862 printk(KERN_WARNING
863 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
864 in6_dev_put(idev);
865 ret = -1;
866 goto out;
867 }
868 in6_ifa_hold(ifp);
869 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
870 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
871 spin_unlock_bh(&ifp->lock);
872 write_unlock(&idev->lock);
873 printk(KERN_WARNING
874 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
875 in6_ifa_put(ifp);
876 in6_dev_put(idev);
877 ret = -1;
878 goto out;
879 }
880 memcpy(&addr.s6_addr[8], idev->rndid, 8);
881 age = (jiffies - ifp->tstamp) / HZ;
882 tmp_valid_lft = min_t(__u32,
883 ifp->valid_lft,
884 idev->cnf.temp_valid_lft + age);
885 tmp_prefered_lft = min_t(__u32,
886 ifp->prefered_lft,
887 idev->cnf.temp_prefered_lft + age -
888 idev->cnf.max_desync_factor);
889 tmp_plen = ifp->prefix_len;
890 max_addresses = idev->cnf.max_addresses;
891 tmp_cstamp = ifp->cstamp;
892 tmp_tstamp = ifp->tstamp;
893 spin_unlock_bh(&ifp->lock);
894
895 regen_advance = idev->cnf.regen_max_retry *
896 idev->cnf.dad_transmits *
897 idev->nd_parms->retrans_time / HZ;
898 write_unlock(&idev->lock);
899
900 /* A temporary address is created only if this calculated Preferred
901 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
902 * an implementation must not create a temporary address with a zero
903 * Preferred Lifetime.
904 */
905 if (tmp_prefered_lft <= regen_advance) {
906 in6_ifa_put(ifp);
907 in6_dev_put(idev);
908 ret = -1;
909 goto out;
910 }
911
912 addr_flags = IFA_F_TEMPORARY;
913 /* set in addrconf_prefix_rcv() */
914 if (ifp->flags & IFA_F_OPTIMISTIC)
915 addr_flags |= IFA_F_OPTIMISTIC;
916
917 ift = !max_addresses ||
918 ipv6_count_addresses(idev) < max_addresses ?
919 ipv6_add_addr(idev, &addr, tmp_plen,
920 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
921 addr_flags) : NULL;
922 if (!ift || IS_ERR(ift)) {
923 in6_ifa_put(ifp);
924 in6_dev_put(idev);
925 printk(KERN_INFO
926 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
927 tmpaddr = &addr;
928 write_lock(&idev->lock);
929 goto retry;
930 }
931
932 spin_lock_bh(&ift->lock);
933 ift->ifpub = ifp;
934 ift->valid_lft = tmp_valid_lft;
935 ift->prefered_lft = tmp_prefered_lft;
936 ift->cstamp = tmp_cstamp;
937 ift->tstamp = tmp_tstamp;
938 spin_unlock_bh(&ift->lock);
939
940 addrconf_dad_start(ift, 0);
941 in6_ifa_put(ift);
942 in6_dev_put(idev);
943 out:
944 return ret;
945 }
946 #endif
947
948 /*
949 * Choose an appropriate source address (RFC3484)
950 */
951 enum {
952 IPV6_SADDR_RULE_INIT = 0,
953 IPV6_SADDR_RULE_LOCAL,
954 IPV6_SADDR_RULE_SCOPE,
955 IPV6_SADDR_RULE_PREFERRED,
956 #ifdef CONFIG_IPV6_MIP6
957 IPV6_SADDR_RULE_HOA,
958 #endif
959 IPV6_SADDR_RULE_OIF,
960 IPV6_SADDR_RULE_LABEL,
961 #ifdef CONFIG_IPV6_PRIVACY
962 IPV6_SADDR_RULE_PRIVACY,
963 #endif
964 IPV6_SADDR_RULE_ORCHID,
965 IPV6_SADDR_RULE_PREFIX,
966 IPV6_SADDR_RULE_MAX
967 };
968
969 struct ipv6_saddr_score {
970 int rule;
971 int addr_type;
972 struct inet6_ifaddr *ifa;
973 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
974 int scopedist;
975 int matchlen;
976 };
977
978 struct ipv6_saddr_dst {
979 const struct in6_addr *addr;
980 int ifindex;
981 int scope;
982 int label;
983 unsigned int prefs;
984 };
985
986 static inline int ipv6_saddr_preferred(int type)
987 {
988 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
989 return 1;
990 return 0;
991 }
992
993 static int ipv6_get_saddr_eval(struct net *net,
994 struct ipv6_saddr_score *score,
995 struct ipv6_saddr_dst *dst,
996 int i)
997 {
998 int ret;
999
1000 if (i <= score->rule) {
1001 switch (i) {
1002 case IPV6_SADDR_RULE_SCOPE:
1003 ret = score->scopedist;
1004 break;
1005 case IPV6_SADDR_RULE_PREFIX:
1006 ret = score->matchlen;
1007 break;
1008 default:
1009 ret = !!test_bit(i, score->scorebits);
1010 }
1011 goto out;
1012 }
1013
1014 switch (i) {
1015 case IPV6_SADDR_RULE_INIT:
1016 /* Rule 0: remember if hiscore is not ready yet */
1017 ret = !!score->ifa;
1018 break;
1019 case IPV6_SADDR_RULE_LOCAL:
1020 /* Rule 1: Prefer same address */
1021 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1022 break;
1023 case IPV6_SADDR_RULE_SCOPE:
1024 /* Rule 2: Prefer appropriate scope
1025 *
1026 * ret
1027 * ^
1028 * -1 | d 15
1029 * ---+--+-+---> scope
1030 * |
1031 * | d is scope of the destination.
1032 * B-d | \
1033 * | \ <- smaller scope is better if
1034 * B-15 | \ if scope is enough for destinaion.
1035 * | ret = B - scope (-1 <= scope >= d <= 15).
1036 * d-C-1 | /
1037 * |/ <- greater is better
1038 * -C / if scope is not enough for destination.
1039 * /| ret = scope - C (-1 <= d < scope <= 15).
1040 *
1041 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1042 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1043 * Assume B = 0 and we get C > 29.
1044 */
1045 ret = __ipv6_addr_src_scope(score->addr_type);
1046 if (ret >= dst->scope)
1047 ret = -ret;
1048 else
1049 ret -= 128; /* 30 is enough */
1050 score->scopedist = ret;
1051 break;
1052 case IPV6_SADDR_RULE_PREFERRED:
1053 /* Rule 3: Avoid deprecated and optimistic addresses */
1054 ret = ipv6_saddr_preferred(score->addr_type) ||
1055 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1056 break;
1057 #ifdef CONFIG_IPV6_MIP6
1058 case IPV6_SADDR_RULE_HOA:
1059 {
1060 /* Rule 4: Prefer home address */
1061 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1062 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1063 break;
1064 }
1065 #endif
1066 case IPV6_SADDR_RULE_OIF:
1067 /* Rule 5: Prefer outgoing interface */
1068 ret = (!dst->ifindex ||
1069 dst->ifindex == score->ifa->idev->dev->ifindex);
1070 break;
1071 case IPV6_SADDR_RULE_LABEL:
1072 /* Rule 6: Prefer matching label */
1073 ret = ipv6_addr_label(net,
1074 &score->ifa->addr, score->addr_type,
1075 score->ifa->idev->dev->ifindex) == dst->label;
1076 break;
1077 #ifdef CONFIG_IPV6_PRIVACY
1078 case IPV6_SADDR_RULE_PRIVACY:
1079 {
1080 /* Rule 7: Prefer public address
1081 * Note: prefer temporary address if use_tempaddr >= 2
1082 */
1083 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1084 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1085 score->ifa->idev->cnf.use_tempaddr >= 2;
1086 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1087 break;
1088 }
1089 #endif
1090 case IPV6_SADDR_RULE_ORCHID:
1091 /* Rule 8-: Prefer ORCHID vs ORCHID or
1092 * non-ORCHID vs non-ORCHID
1093 */
1094 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1095 ipv6_addr_orchid(dst->addr));
1096 break;
1097 case IPV6_SADDR_RULE_PREFIX:
1098 /* Rule 8: Use longest matching prefix */
1099 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr,
1100 dst->addr);
1101 break;
1102 default:
1103 ret = 0;
1104 }
1105
1106 if (ret)
1107 __set_bit(i, score->scorebits);
1108 score->rule = i;
1109 out:
1110 return ret;
1111 }
1112
1113 int ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev,
1114 const struct in6_addr *daddr, unsigned int prefs,
1115 struct in6_addr *saddr)
1116 {
1117 struct ipv6_saddr_score scores[2],
1118 *score = &scores[0], *hiscore = &scores[1];
1119 struct ipv6_saddr_dst dst;
1120 struct net_device *dev;
1121 int dst_type;
1122
1123 dst_type = __ipv6_addr_type(daddr);
1124 dst.addr = daddr;
1125 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1126 dst.scope = __ipv6_addr_src_scope(dst_type);
1127 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1128 dst.prefs = prefs;
1129
1130 hiscore->rule = -1;
1131 hiscore->ifa = NULL;
1132
1133 rcu_read_lock();
1134
1135 for_each_netdev_rcu(net, dev) {
1136 struct inet6_dev *idev;
1137
1138 /* Candidate Source Address (section 4)
1139 * - multicast and link-local destination address,
1140 * the set of candidate source address MUST only
1141 * include addresses assigned to interfaces
1142 * belonging to the same link as the outgoing
1143 * interface.
1144 * (- For site-local destination addresses, the
1145 * set of candidate source addresses MUST only
1146 * include addresses assigned to interfaces
1147 * belonging to the same site as the outgoing
1148 * interface.)
1149 */
1150 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1151 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1152 dst.ifindex && dev->ifindex != dst.ifindex)
1153 continue;
1154
1155 idev = __in6_dev_get(dev);
1156 if (!idev)
1157 continue;
1158
1159 read_lock_bh(&idev->lock);
1160 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1161 int i;
1162
1163 /*
1164 * - Tentative Address (RFC2462 section 5.4)
1165 * - A tentative address is not considered
1166 * "assigned to an interface" in the traditional
1167 * sense, unless it is also flagged as optimistic.
1168 * - Candidate Source Address (section 4)
1169 * - In any case, anycast addresses, multicast
1170 * addresses, and the unspecified address MUST
1171 * NOT be included in a candidate set.
1172 */
1173 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1174 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1175 continue;
1176
1177 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1178
1179 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1180 score->addr_type & IPV6_ADDR_MULTICAST)) {
1181 LIMIT_NETDEBUG(KERN_DEBUG
1182 "ADDRCONF: unspecified / multicast address "
1183 "assigned as unicast address on %s",
1184 dev->name);
1185 continue;
1186 }
1187
1188 score->rule = -1;
1189 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1190
1191 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1192 int minihiscore, miniscore;
1193
1194 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1195 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1196
1197 if (minihiscore > miniscore) {
1198 if (i == IPV6_SADDR_RULE_SCOPE &&
1199 score->scopedist > 0) {
1200 /*
1201 * special case:
1202 * each remaining entry
1203 * has too small (not enough)
1204 * scope, because ifa entries
1205 * are sorted by their scope
1206 * values.
1207 */
1208 goto try_nextdev;
1209 }
1210 break;
1211 } else if (minihiscore < miniscore) {
1212 if (hiscore->ifa)
1213 in6_ifa_put(hiscore->ifa);
1214
1215 in6_ifa_hold(score->ifa);
1216
1217 swap(hiscore, score);
1218
1219 /* restore our iterator */
1220 score->ifa = hiscore->ifa;
1221
1222 break;
1223 }
1224 }
1225 }
1226 try_nextdev:
1227 read_unlock_bh(&idev->lock);
1228 }
1229 rcu_read_unlock();
1230
1231 if (!hiscore->ifa)
1232 return -EADDRNOTAVAIL;
1233
1234 ipv6_addr_copy(saddr, &hiscore->ifa->addr);
1235 in6_ifa_put(hiscore->ifa);
1236 return 0;
1237 }
1238 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1239
1240 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1241 unsigned char banned_flags)
1242 {
1243 struct inet6_dev *idev;
1244 int err = -EADDRNOTAVAIL;
1245
1246 rcu_read_lock();
1247 idev = __in6_dev_get(dev);
1248 if (idev) {
1249 struct inet6_ifaddr *ifp;
1250
1251 read_lock_bh(&idev->lock);
1252 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1253 if (ifp->scope == IFA_LINK &&
1254 !(ifp->flags & banned_flags)) {
1255 ipv6_addr_copy(addr, &ifp->addr);
1256 err = 0;
1257 break;
1258 }
1259 }
1260 read_unlock_bh(&idev->lock);
1261 }
1262 rcu_read_unlock();
1263 return err;
1264 }
1265
1266 static int ipv6_count_addresses(struct inet6_dev *idev)
1267 {
1268 int cnt = 0;
1269 struct inet6_ifaddr *ifp;
1270
1271 read_lock_bh(&idev->lock);
1272 list_for_each_entry(ifp, &idev->addr_list, if_list)
1273 cnt++;
1274 read_unlock_bh(&idev->lock);
1275 return cnt;
1276 }
1277
1278 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1279 struct net_device *dev, int strict)
1280 {
1281 struct inet6_ifaddr *ifp;
1282 struct hlist_node *node;
1283 unsigned int hash = ipv6_addr_hash(addr);
1284
1285 rcu_read_lock_bh();
1286 hlist_for_each_entry_rcu(ifp, node, &inet6_addr_lst[hash], addr_lst) {
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 (dev == NULL || ifp->idev->dev == dev ||
1292 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1293 rcu_read_unlock_bh();
1294 return 1;
1295 }
1296 }
1297
1298 rcu_read_unlock_bh();
1299 return 0;
1300 }
1301 EXPORT_SYMBOL(ipv6_chk_addr);
1302
1303 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1304 struct net_device *dev)
1305 {
1306 unsigned int hash = ipv6_addr_hash(addr);
1307 struct inet6_ifaddr *ifp;
1308 struct hlist_node *node;
1309
1310 hlist_for_each_entry(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1311 if (!net_eq(dev_net(ifp->idev->dev), net))
1312 continue;
1313 if (ipv6_addr_equal(&ifp->addr, addr)) {
1314 if (dev == NULL || ifp->idev->dev == dev)
1315 return true;
1316 }
1317 }
1318 return false;
1319 }
1320
1321 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1322 {
1323 struct inet6_dev *idev;
1324 struct inet6_ifaddr *ifa;
1325 int onlink;
1326
1327 onlink = 0;
1328 rcu_read_lock();
1329 idev = __in6_dev_get(dev);
1330 if (idev) {
1331 read_lock_bh(&idev->lock);
1332 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1333 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1334 ifa->prefix_len);
1335 if (onlink)
1336 break;
1337 }
1338 read_unlock_bh(&idev->lock);
1339 }
1340 rcu_read_unlock();
1341 return onlink;
1342 }
1343
1344 EXPORT_SYMBOL(ipv6_chk_prefix);
1345
1346 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1347 struct net_device *dev, int strict)
1348 {
1349 struct inet6_ifaddr *ifp, *result = NULL;
1350 unsigned int hash = ipv6_addr_hash(addr);
1351 struct hlist_node *node;
1352
1353 rcu_read_lock_bh();
1354 hlist_for_each_entry_rcu_bh(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1355 if (!net_eq(dev_net(ifp->idev->dev), net))
1356 continue;
1357 if (ipv6_addr_equal(&ifp->addr, addr)) {
1358 if (dev == NULL || ifp->idev->dev == dev ||
1359 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1360 result = ifp;
1361 in6_ifa_hold(ifp);
1362 break;
1363 }
1364 }
1365 }
1366 rcu_read_unlock_bh();
1367
1368 return result;
1369 }
1370
1371 /* Gets referenced address, destroys ifaddr */
1372
1373 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1374 {
1375 if (ifp->flags&IFA_F_PERMANENT) {
1376 spin_lock_bh(&ifp->lock);
1377 addrconf_del_timer(ifp);
1378 ifp->flags |= IFA_F_TENTATIVE;
1379 if (dad_failed)
1380 ifp->flags |= IFA_F_DADFAILED;
1381 spin_unlock_bh(&ifp->lock);
1382 if (dad_failed)
1383 ipv6_ifa_notify(0, ifp);
1384 in6_ifa_put(ifp);
1385 #ifdef CONFIG_IPV6_PRIVACY
1386 } else if (ifp->flags&IFA_F_TEMPORARY) {
1387 struct inet6_ifaddr *ifpub;
1388 spin_lock_bh(&ifp->lock);
1389 ifpub = ifp->ifpub;
1390 if (ifpub) {
1391 in6_ifa_hold(ifpub);
1392 spin_unlock_bh(&ifp->lock);
1393 ipv6_create_tempaddr(ifpub, ifp);
1394 in6_ifa_put(ifpub);
1395 } else {
1396 spin_unlock_bh(&ifp->lock);
1397 }
1398 ipv6_del_addr(ifp);
1399 #endif
1400 } else
1401 ipv6_del_addr(ifp);
1402 }
1403
1404 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1405 {
1406 int err = -ENOENT;
1407
1408 spin_lock(&ifp->state_lock);
1409 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1410 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1411 err = 0;
1412 }
1413 spin_unlock(&ifp->state_lock);
1414
1415 return err;
1416 }
1417
1418 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1419 {
1420 struct inet6_dev *idev = ifp->idev;
1421
1422 if (addrconf_dad_end(ifp)) {
1423 in6_ifa_put(ifp);
1424 return;
1425 }
1426
1427 if (net_ratelimit())
1428 printk(KERN_INFO "%s: IPv6 duplicate address %pI6c detected!\n",
1429 ifp->idev->dev->name, &ifp->addr);
1430
1431 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1432 struct in6_addr addr;
1433
1434 addr.s6_addr32[0] = htonl(0xfe800000);
1435 addr.s6_addr32[1] = 0;
1436
1437 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1438 ipv6_addr_equal(&ifp->addr, &addr)) {
1439 /* DAD failed for link-local based on MAC address */
1440 idev->cnf.disable_ipv6 = 1;
1441
1442 printk(KERN_INFO "%s: IPv6 being disabled!\n",
1443 ifp->idev->dev->name);
1444 }
1445 }
1446
1447 addrconf_dad_stop(ifp, 1);
1448 }
1449
1450 /* Join to solicited addr multicast group. */
1451
1452 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1453 {
1454 struct in6_addr maddr;
1455
1456 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1457 return;
1458
1459 addrconf_addr_solict_mult(addr, &maddr);
1460 ipv6_dev_mc_inc(dev, &maddr);
1461 }
1462
1463 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1464 {
1465 struct in6_addr maddr;
1466
1467 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1468 return;
1469
1470 addrconf_addr_solict_mult(addr, &maddr);
1471 __ipv6_dev_mc_dec(idev, &maddr);
1472 }
1473
1474 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1475 {
1476 struct in6_addr addr;
1477 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1478 if (ipv6_addr_any(&addr))
1479 return;
1480 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1481 }
1482
1483 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1484 {
1485 struct in6_addr addr;
1486 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1487 if (ipv6_addr_any(&addr))
1488 return;
1489 __ipv6_dev_ac_dec(ifp->idev, &addr);
1490 }
1491
1492 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1493 {
1494 if (dev->addr_len != ETH_ALEN)
1495 return -1;
1496 memcpy(eui, dev->dev_addr, 3);
1497 memcpy(eui + 5, dev->dev_addr + 3, 3);
1498
1499 /*
1500 * The zSeries OSA network cards can be shared among various
1501 * OS instances, but the OSA cards have only one MAC address.
1502 * This leads to duplicate address conflicts in conjunction
1503 * with IPv6 if more than one instance uses the same card.
1504 *
1505 * The driver for these cards can deliver a unique 16-bit
1506 * identifier for each instance sharing the same card. It is
1507 * placed instead of 0xFFFE in the interface identifier. The
1508 * "u" bit of the interface identifier is not inverted in this
1509 * case. Hence the resulting interface identifier has local
1510 * scope according to RFC2373.
1511 */
1512 if (dev->dev_id) {
1513 eui[3] = (dev->dev_id >> 8) & 0xFF;
1514 eui[4] = dev->dev_id & 0xFF;
1515 } else {
1516 eui[3] = 0xFF;
1517 eui[4] = 0xFE;
1518 eui[0] ^= 2;
1519 }
1520 return 0;
1521 }
1522
1523 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1524 {
1525 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1526 if (dev->addr_len != ARCNET_ALEN)
1527 return -1;
1528 memset(eui, 0, 7);
1529 eui[7] = *(u8*)dev->dev_addr;
1530 return 0;
1531 }
1532
1533 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1534 {
1535 if (dev->addr_len != INFINIBAND_ALEN)
1536 return -1;
1537 memcpy(eui, dev->dev_addr + 12, 8);
1538 eui[0] |= 2;
1539 return 0;
1540 }
1541
1542 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1543 {
1544 if (addr == 0)
1545 return -1;
1546 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1547 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1548 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1549 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1550 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1551 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1552 eui[1] = 0;
1553 eui[2] = 0x5E;
1554 eui[3] = 0xFE;
1555 memcpy(eui + 4, &addr, 4);
1556 return 0;
1557 }
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 list_for_each_entry(ifp, &idev->addr_list, if_list) {
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 -
1650 idev->cnf.max_desync_factor * HZ;
1651 if (time_before(expires, jiffies)) {
1652 printk(KERN_WARNING
1653 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1654 idev->dev->name);
1655 goto out;
1656 }
1657
1658 if (!mod_timer(&idev->regen_timer, expires))
1659 in6_dev_hold(idev);
1660
1661 out:
1662 write_unlock_bh(&idev->lock);
1663 rcu_read_unlock_bh();
1664 in6_dev_put(idev);
1665 }
1666
1667 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1668 int ret = 0;
1669
1670 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1671 ret = __ipv6_regen_rndid(idev);
1672 return ret;
1673 }
1674 #endif
1675
1676 /*
1677 * Add prefix route.
1678 */
1679
1680 static void
1681 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1682 unsigned long expires, u32 flags)
1683 {
1684 struct fib6_config cfg = {
1685 .fc_table = RT6_TABLE_PREFIX,
1686 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1687 .fc_ifindex = dev->ifindex,
1688 .fc_expires = expires,
1689 .fc_dst_len = plen,
1690 .fc_flags = RTF_UP | flags,
1691 .fc_nlinfo.nl_net = dev_net(dev),
1692 .fc_protocol = RTPROT_KERNEL,
1693 };
1694
1695 ipv6_addr_copy(&cfg.fc_dst, pfx);
1696
1697 /* Prevent useless cloning on PtP SIT.
1698 This thing is done here expecting that the whole
1699 class of non-broadcast devices need not cloning.
1700 */
1701 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1702 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1703 cfg.fc_flags |= RTF_NONEXTHOP;
1704 #endif
1705
1706 ip6_route_add(&cfg);
1707 }
1708
1709 /* Create "default" multicast route to the interface */
1710
1711 static void addrconf_add_mroute(struct net_device *dev)
1712 {
1713 struct fib6_config cfg = {
1714 .fc_table = RT6_TABLE_LOCAL,
1715 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1716 .fc_ifindex = dev->ifindex,
1717 .fc_dst_len = 8,
1718 .fc_flags = RTF_UP,
1719 .fc_nlinfo.nl_net = dev_net(dev),
1720 };
1721
1722 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1723
1724 ip6_route_add(&cfg);
1725 }
1726
1727 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1728 static void sit_route_add(struct net_device *dev)
1729 {
1730 struct fib6_config cfg = {
1731 .fc_table = RT6_TABLE_MAIN,
1732 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1733 .fc_ifindex = dev->ifindex,
1734 .fc_dst_len = 96,
1735 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1736 .fc_nlinfo.nl_net = dev_net(dev),
1737 };
1738
1739 /* prefix length - 96 bits "::d.d.d.d" */
1740 ip6_route_add(&cfg);
1741 }
1742 #endif
1743
1744 static void addrconf_add_lroute(struct net_device *dev)
1745 {
1746 struct in6_addr addr;
1747
1748 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1749 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1750 }
1751
1752 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1753 {
1754 struct inet6_dev *idev;
1755
1756 ASSERT_RTNL();
1757
1758 idev = ipv6_find_idev(dev);
1759 if (!idev)
1760 return ERR_PTR(-ENOBUFS);
1761
1762 if (idev->cnf.disable_ipv6)
1763 return ERR_PTR(-EACCES);
1764
1765 /* Add default multicast route */
1766 addrconf_add_mroute(dev);
1767
1768 /* Add link local route */
1769 addrconf_add_lroute(dev);
1770 return idev;
1771 }
1772
1773 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1774 {
1775 struct prefix_info *pinfo;
1776 __u32 valid_lft;
1777 __u32 prefered_lft;
1778 int addr_type;
1779 struct inet6_dev *in6_dev;
1780 struct net *net = dev_net(dev);
1781
1782 pinfo = (struct prefix_info *) opt;
1783
1784 if (len < sizeof(struct prefix_info)) {
1785 ADBG(("addrconf: prefix option too short\n"));
1786 return;
1787 }
1788
1789 /*
1790 * Validation checks ([ADDRCONF], page 19)
1791 */
1792
1793 addr_type = ipv6_addr_type(&pinfo->prefix);
1794
1795 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1796 return;
1797
1798 valid_lft = ntohl(pinfo->valid);
1799 prefered_lft = ntohl(pinfo->prefered);
1800
1801 if (prefered_lft > valid_lft) {
1802 if (net_ratelimit())
1803 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1804 return;
1805 }
1806
1807 in6_dev = in6_dev_get(dev);
1808
1809 if (in6_dev == NULL) {
1810 if (net_ratelimit())
1811 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1812 return;
1813 }
1814
1815 /*
1816 * Two things going on here:
1817 * 1) Add routes for on-link prefixes
1818 * 2) Configure prefixes with the auto flag set
1819 */
1820
1821 if (pinfo->onlink) {
1822 struct rt6_info *rt;
1823 unsigned long rt_expires;
1824
1825 /* Avoid arithmetic overflow. Really, we could
1826 * save rt_expires in seconds, likely valid_lft,
1827 * but it would require division in fib gc, that it
1828 * not good.
1829 */
1830 if (HZ > USER_HZ)
1831 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
1832 else
1833 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
1834
1835 if (addrconf_finite_timeout(rt_expires))
1836 rt_expires *= HZ;
1837
1838 rt = rt6_lookup(net, &pinfo->prefix, NULL,
1839 dev->ifindex, 1);
1840
1841 if (rt && addrconf_is_prefix_route(rt)) {
1842 /* Autoconf prefix route */
1843 if (valid_lft == 0) {
1844 ip6_del_rt(rt);
1845 rt = NULL;
1846 } else if (addrconf_finite_timeout(rt_expires)) {
1847 /* not infinity */
1848 rt->rt6i_expires = jiffies + rt_expires;
1849 rt->rt6i_flags |= RTF_EXPIRES;
1850 } else {
1851 rt->rt6i_flags &= ~RTF_EXPIRES;
1852 rt->rt6i_expires = 0;
1853 }
1854 } else if (valid_lft) {
1855 clock_t expires = 0;
1856 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
1857 if (addrconf_finite_timeout(rt_expires)) {
1858 /* not infinity */
1859 flags |= RTF_EXPIRES;
1860 expires = jiffies_to_clock_t(rt_expires);
1861 }
1862 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1863 dev, expires, flags);
1864 }
1865 if (rt)
1866 dst_release(&rt->dst);
1867 }
1868
1869 /* Try to figure out our local address for this prefix */
1870
1871 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1872 struct inet6_ifaddr * ifp;
1873 struct in6_addr addr;
1874 int create = 0, update_lft = 0;
1875
1876 if (pinfo->prefix_len == 64) {
1877 memcpy(&addr, &pinfo->prefix, 8);
1878 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1879 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1880 in6_dev_put(in6_dev);
1881 return;
1882 }
1883 goto ok;
1884 }
1885 if (net_ratelimit())
1886 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1887 pinfo->prefix_len);
1888 in6_dev_put(in6_dev);
1889 return;
1890
1891 ok:
1892
1893 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1894
1895 if (ifp == NULL && valid_lft) {
1896 int max_addresses = in6_dev->cnf.max_addresses;
1897 u32 addr_flags = 0;
1898
1899 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1900 if (in6_dev->cnf.optimistic_dad &&
1901 !net->ipv6.devconf_all->forwarding)
1902 addr_flags = IFA_F_OPTIMISTIC;
1903 #endif
1904
1905 /* Do not allow to create too much of autoconfigured
1906 * addresses; this would be too easy way to crash kernel.
1907 */
1908 if (!max_addresses ||
1909 ipv6_count_addresses(in6_dev) < max_addresses)
1910 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1911 addr_type&IPV6_ADDR_SCOPE_MASK,
1912 addr_flags);
1913
1914 if (!ifp || IS_ERR(ifp)) {
1915 in6_dev_put(in6_dev);
1916 return;
1917 }
1918
1919 update_lft = create = 1;
1920 ifp->cstamp = jiffies;
1921 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1922 }
1923
1924 if (ifp) {
1925 int flags;
1926 unsigned long now;
1927 #ifdef CONFIG_IPV6_PRIVACY
1928 struct inet6_ifaddr *ift;
1929 #endif
1930 u32 stored_lft;
1931
1932 /* update lifetime (RFC2462 5.5.3 e) */
1933 spin_lock(&ifp->lock);
1934 now = jiffies;
1935 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1936 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1937 else
1938 stored_lft = 0;
1939 if (!update_lft && stored_lft) {
1940 if (valid_lft > MIN_VALID_LIFETIME ||
1941 valid_lft > stored_lft)
1942 update_lft = 1;
1943 else if (stored_lft <= MIN_VALID_LIFETIME) {
1944 /* valid_lft <= stored_lft is always true */
1945 /*
1946 * RFC 4862 Section 5.5.3e:
1947 * "Note that the preferred lifetime of
1948 * the corresponding address is always
1949 * reset to the Preferred Lifetime in
1950 * the received Prefix Information
1951 * option, regardless of whether the
1952 * valid lifetime is also reset or
1953 * ignored."
1954 *
1955 * So if the preferred lifetime in
1956 * this advertisement is different
1957 * than what we have stored, but the
1958 * valid lifetime is invalid, just
1959 * reset prefered_lft.
1960 *
1961 * We must set the valid lifetime
1962 * to the stored lifetime since we'll
1963 * be updating the timestamp below,
1964 * else we'll set it back to the
1965 * minimum.
1966 */
1967 if (prefered_lft != ifp->prefered_lft) {
1968 valid_lft = stored_lft;
1969 update_lft = 1;
1970 }
1971 } else {
1972 valid_lft = MIN_VALID_LIFETIME;
1973 if (valid_lft < prefered_lft)
1974 prefered_lft = valid_lft;
1975 update_lft = 1;
1976 }
1977 }
1978
1979 if (update_lft) {
1980 ifp->valid_lft = valid_lft;
1981 ifp->prefered_lft = prefered_lft;
1982 ifp->tstamp = now;
1983 flags = ifp->flags;
1984 ifp->flags &= ~IFA_F_DEPRECATED;
1985 spin_unlock(&ifp->lock);
1986
1987 if (!(flags&IFA_F_TENTATIVE))
1988 ipv6_ifa_notify(0, ifp);
1989 } else
1990 spin_unlock(&ifp->lock);
1991
1992 #ifdef CONFIG_IPV6_PRIVACY
1993 read_lock_bh(&in6_dev->lock);
1994 /* update all temporary addresses in the list */
1995 list_for_each_entry(ift, &in6_dev->tempaddr_list, tmp_list) {
1996 /*
1997 * When adjusting the lifetimes of an existing
1998 * temporary address, only lower the lifetimes.
1999 * Implementations must not increase the
2000 * lifetimes of an existing temporary address
2001 * when processing a Prefix Information Option.
2002 */
2003 if (ifp != ift->ifpub)
2004 continue;
2005
2006 spin_lock(&ift->lock);
2007 flags = ift->flags;
2008 if (ift->valid_lft > valid_lft &&
2009 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
2010 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
2011 if (ift->prefered_lft > prefered_lft &&
2012 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
2013 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
2014 spin_unlock(&ift->lock);
2015 if (!(flags&IFA_F_TENTATIVE))
2016 ipv6_ifa_notify(0, ift);
2017 }
2018
2019 if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) {
2020 /*
2021 * When a new public address is created as described in [ADDRCONF],
2022 * also create a new temporary address. Also create a temporary
2023 * address if it's enabled but no temporary address currently exists.
2024 */
2025 read_unlock_bh(&in6_dev->lock);
2026 ipv6_create_tempaddr(ifp, NULL);
2027 } else {
2028 read_unlock_bh(&in6_dev->lock);
2029 }
2030 #endif
2031 in6_ifa_put(ifp);
2032 addrconf_verify(0);
2033 }
2034 }
2035 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2036 in6_dev_put(in6_dev);
2037 }
2038
2039 /*
2040 * Set destination address.
2041 * Special case for SIT interfaces where we create a new "virtual"
2042 * device.
2043 */
2044 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2045 {
2046 struct in6_ifreq ireq;
2047 struct net_device *dev;
2048 int err = -EINVAL;
2049
2050 rtnl_lock();
2051
2052 err = -EFAULT;
2053 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2054 goto err_exit;
2055
2056 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2057
2058 err = -ENODEV;
2059 if (dev == NULL)
2060 goto err_exit;
2061
2062 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2063 if (dev->type == ARPHRD_SIT) {
2064 const struct net_device_ops *ops = dev->netdev_ops;
2065 struct ifreq ifr;
2066 struct ip_tunnel_parm p;
2067
2068 err = -EADDRNOTAVAIL;
2069 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2070 goto err_exit;
2071
2072 memset(&p, 0, sizeof(p));
2073 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2074 p.iph.saddr = 0;
2075 p.iph.version = 4;
2076 p.iph.ihl = 5;
2077 p.iph.protocol = IPPROTO_IPV6;
2078 p.iph.ttl = 64;
2079 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2080
2081 if (ops->ndo_do_ioctl) {
2082 mm_segment_t oldfs = get_fs();
2083
2084 set_fs(KERNEL_DS);
2085 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2086 set_fs(oldfs);
2087 } else
2088 err = -EOPNOTSUPP;
2089
2090 if (err == 0) {
2091 err = -ENOBUFS;
2092 dev = __dev_get_by_name(net, p.name);
2093 if (!dev)
2094 goto err_exit;
2095 err = dev_open(dev);
2096 }
2097 }
2098 #endif
2099
2100 err_exit:
2101 rtnl_unlock();
2102 return err;
2103 }
2104
2105 /*
2106 * Manual configuration of address on an interface
2107 */
2108 static int inet6_addr_add(struct net *net, int ifindex, const struct in6_addr *pfx,
2109 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
2110 __u32 valid_lft)
2111 {
2112 struct inet6_ifaddr *ifp;
2113 struct inet6_dev *idev;
2114 struct net_device *dev;
2115 int scope;
2116 u32 flags;
2117 clock_t expires;
2118 unsigned long timeout;
2119
2120 ASSERT_RTNL();
2121
2122 if (plen > 128)
2123 return -EINVAL;
2124
2125 /* check the lifetime */
2126 if (!valid_lft || prefered_lft > valid_lft)
2127 return -EINVAL;
2128
2129 dev = __dev_get_by_index(net, ifindex);
2130 if (!dev)
2131 return -ENODEV;
2132
2133 idev = addrconf_add_dev(dev);
2134 if (IS_ERR(idev))
2135 return PTR_ERR(idev);
2136
2137 scope = ipv6_addr_scope(pfx);
2138
2139 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2140 if (addrconf_finite_timeout(timeout)) {
2141 expires = jiffies_to_clock_t(timeout * HZ);
2142 valid_lft = timeout;
2143 flags = RTF_EXPIRES;
2144 } else {
2145 expires = 0;
2146 flags = 0;
2147 ifa_flags |= IFA_F_PERMANENT;
2148 }
2149
2150 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2151 if (addrconf_finite_timeout(timeout)) {
2152 if (timeout == 0)
2153 ifa_flags |= IFA_F_DEPRECATED;
2154 prefered_lft = timeout;
2155 }
2156
2157 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2158
2159 if (!IS_ERR(ifp)) {
2160 spin_lock_bh(&ifp->lock);
2161 ifp->valid_lft = valid_lft;
2162 ifp->prefered_lft = prefered_lft;
2163 ifp->tstamp = jiffies;
2164 spin_unlock_bh(&ifp->lock);
2165
2166 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2167 expires, flags);
2168 /*
2169 * Note that section 3.1 of RFC 4429 indicates
2170 * that the Optimistic flag should not be set for
2171 * manually configured addresses
2172 */
2173 addrconf_dad_start(ifp, 0);
2174 in6_ifa_put(ifp);
2175 addrconf_verify(0);
2176 return 0;
2177 }
2178
2179 return PTR_ERR(ifp);
2180 }
2181
2182 static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx,
2183 unsigned int plen)
2184 {
2185 struct inet6_ifaddr *ifp;
2186 struct inet6_dev *idev;
2187 struct net_device *dev;
2188
2189 if (plen > 128)
2190 return -EINVAL;
2191
2192 dev = __dev_get_by_index(net, ifindex);
2193 if (!dev)
2194 return -ENODEV;
2195
2196 if ((idev = __in6_dev_get(dev)) == NULL)
2197 return -ENXIO;
2198
2199 read_lock_bh(&idev->lock);
2200 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2201 if (ifp->prefix_len == plen &&
2202 ipv6_addr_equal(pfx, &ifp->addr)) {
2203 in6_ifa_hold(ifp);
2204 read_unlock_bh(&idev->lock);
2205
2206 ipv6_del_addr(ifp);
2207
2208 /* If the last address is deleted administratively,
2209 disable IPv6 on this interface.
2210 */
2211 if (list_empty(&idev->addr_list))
2212 addrconf_ifdown(idev->dev, 1);
2213 return 0;
2214 }
2215 }
2216 read_unlock_bh(&idev->lock);
2217 return -EADDRNOTAVAIL;
2218 }
2219
2220
2221 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2222 {
2223 struct in6_ifreq ireq;
2224 int err;
2225
2226 if (!capable(CAP_NET_ADMIN))
2227 return -EPERM;
2228
2229 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2230 return -EFAULT;
2231
2232 rtnl_lock();
2233 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2234 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2235 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2236 rtnl_unlock();
2237 return err;
2238 }
2239
2240 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2241 {
2242 struct in6_ifreq ireq;
2243 int err;
2244
2245 if (!capable(CAP_NET_ADMIN))
2246 return -EPERM;
2247
2248 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2249 return -EFAULT;
2250
2251 rtnl_lock();
2252 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2253 ireq.ifr6_prefixlen);
2254 rtnl_unlock();
2255 return err;
2256 }
2257
2258 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2259 int plen, int scope)
2260 {
2261 struct inet6_ifaddr *ifp;
2262
2263 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT);
2264 if (!IS_ERR(ifp)) {
2265 spin_lock_bh(&ifp->lock);
2266 ifp->flags &= ~IFA_F_TENTATIVE;
2267 spin_unlock_bh(&ifp->lock);
2268 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2269 in6_ifa_put(ifp);
2270 }
2271 }
2272
2273 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2274 static void sit_add_v4_addrs(struct inet6_dev *idev)
2275 {
2276 struct in6_addr addr;
2277 struct net_device *dev;
2278 struct net *net = dev_net(idev->dev);
2279 int scope;
2280
2281 ASSERT_RTNL();
2282
2283 memset(&addr, 0, sizeof(struct in6_addr));
2284 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2285
2286 if (idev->dev->flags&IFF_POINTOPOINT) {
2287 addr.s6_addr32[0] = htonl(0xfe800000);
2288 scope = IFA_LINK;
2289 } else {
2290 scope = IPV6_ADDR_COMPATv4;
2291 }
2292
2293 if (addr.s6_addr32[3]) {
2294 add_addr(idev, &addr, 128, scope);
2295 return;
2296 }
2297
2298 for_each_netdev(net, dev) {
2299 struct in_device * in_dev = __in_dev_get_rtnl(dev);
2300 if (in_dev && (dev->flags & IFF_UP)) {
2301 struct in_ifaddr * ifa;
2302
2303 int flag = scope;
2304
2305 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2306 int plen;
2307
2308 addr.s6_addr32[3] = ifa->ifa_local;
2309
2310 if (ifa->ifa_scope == RT_SCOPE_LINK)
2311 continue;
2312 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2313 if (idev->dev->flags&IFF_POINTOPOINT)
2314 continue;
2315 flag |= IFA_HOST;
2316 }
2317 if (idev->dev->flags&IFF_POINTOPOINT)
2318 plen = 64;
2319 else
2320 plen = 96;
2321
2322 add_addr(idev, &addr, plen, flag);
2323 }
2324 }
2325 }
2326 }
2327 #endif
2328
2329 static void init_loopback(struct net_device *dev)
2330 {
2331 struct inet6_dev *idev;
2332
2333 /* ::1 */
2334
2335 ASSERT_RTNL();
2336
2337 if ((idev = ipv6_find_idev(dev)) == NULL) {
2338 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2339 return;
2340 }
2341
2342 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2343 }
2344
2345 static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr)
2346 {
2347 struct inet6_ifaddr * ifp;
2348 u32 addr_flags = IFA_F_PERMANENT;
2349
2350 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2351 if (idev->cnf.optimistic_dad &&
2352 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2353 addr_flags |= IFA_F_OPTIMISTIC;
2354 #endif
2355
2356
2357 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2358 if (!IS_ERR(ifp)) {
2359 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2360 addrconf_dad_start(ifp, 0);
2361 in6_ifa_put(ifp);
2362 }
2363 }
2364
2365 static void addrconf_dev_config(struct net_device *dev)
2366 {
2367 struct in6_addr addr;
2368 struct inet6_dev * idev;
2369
2370 ASSERT_RTNL();
2371
2372 if ((dev->type != ARPHRD_ETHER) &&
2373 (dev->type != ARPHRD_FDDI) &&
2374 (dev->type != ARPHRD_IEEE802_TR) &&
2375 (dev->type != ARPHRD_ARCNET) &&
2376 (dev->type != ARPHRD_INFINIBAND)) {
2377 /* Alas, we support only Ethernet autoconfiguration. */
2378 return;
2379 }
2380
2381 idev = addrconf_add_dev(dev);
2382 if (IS_ERR(idev))
2383 return;
2384
2385 memset(&addr, 0, sizeof(struct in6_addr));
2386 addr.s6_addr32[0] = htonl(0xFE800000);
2387
2388 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2389 addrconf_add_linklocal(idev, &addr);
2390 }
2391
2392 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2393 static void addrconf_sit_config(struct net_device *dev)
2394 {
2395 struct inet6_dev *idev;
2396
2397 ASSERT_RTNL();
2398
2399 /*
2400 * Configure the tunnel with one of our IPv4
2401 * addresses... we should configure all of
2402 * our v4 addrs in the tunnel
2403 */
2404
2405 if ((idev = ipv6_find_idev(dev)) == NULL) {
2406 printk(KERN_DEBUG "init sit: add_dev failed\n");
2407 return;
2408 }
2409
2410 if (dev->priv_flags & IFF_ISATAP) {
2411 struct in6_addr addr;
2412
2413 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2414 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2415 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2416 addrconf_add_linklocal(idev, &addr);
2417 return;
2418 }
2419
2420 sit_add_v4_addrs(idev);
2421
2422 if (dev->flags&IFF_POINTOPOINT) {
2423 addrconf_add_mroute(dev);
2424 addrconf_add_lroute(dev);
2425 } else
2426 sit_route_add(dev);
2427 }
2428 #endif
2429
2430 static inline int
2431 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2432 {
2433 struct in6_addr lladdr;
2434
2435 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2436 addrconf_add_linklocal(idev, &lladdr);
2437 return 0;
2438 }
2439 return -1;
2440 }
2441
2442 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2443 {
2444 struct net_device *link_dev;
2445 struct net *net = dev_net(idev->dev);
2446
2447 /* first try to inherit the link-local address from the link device */
2448 if (idev->dev->iflink &&
2449 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
2450 if (!ipv6_inherit_linklocal(idev, link_dev))
2451 return;
2452 }
2453 /* then try to inherit it from any device */
2454 for_each_netdev(net, link_dev) {
2455 if (!ipv6_inherit_linklocal(idev, link_dev))
2456 return;
2457 }
2458 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2459 }
2460
2461 /*
2462 * Autoconfigure tunnel with a link-local address so routing protocols,
2463 * DHCPv6, MLD etc. can be run over the virtual link
2464 */
2465
2466 static void addrconf_ip6_tnl_config(struct net_device *dev)
2467 {
2468 struct inet6_dev *idev;
2469
2470 ASSERT_RTNL();
2471
2472 idev = addrconf_add_dev(dev);
2473 if (IS_ERR(idev)) {
2474 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2475 return;
2476 }
2477 ip6_tnl_add_linklocal(idev);
2478 }
2479
2480 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2481 void * data)
2482 {
2483 struct net_device *dev = (struct net_device *) data;
2484 struct inet6_dev *idev = __in6_dev_get(dev);
2485 int run_pending = 0;
2486 int err;
2487
2488 switch (event) {
2489 case NETDEV_REGISTER:
2490 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2491 idev = ipv6_add_dev(dev);
2492 if (!idev)
2493 return notifier_from_errno(-ENOMEM);
2494 }
2495 break;
2496
2497 case NETDEV_UP:
2498 case NETDEV_CHANGE:
2499 if (dev->flags & IFF_SLAVE)
2500 break;
2501
2502 if (event == NETDEV_UP) {
2503 if (!addrconf_qdisc_ok(dev)) {
2504 /* device is not ready yet. */
2505 printk(KERN_INFO
2506 "ADDRCONF(NETDEV_UP): %s: "
2507 "link is not ready\n",
2508 dev->name);
2509 break;
2510 }
2511
2512 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2513 idev = ipv6_add_dev(dev);
2514
2515 if (idev) {
2516 idev->if_flags |= IF_READY;
2517 run_pending = 1;
2518 }
2519 } else {
2520 if (!addrconf_qdisc_ok(dev)) {
2521 /* device is still not ready. */
2522 break;
2523 }
2524
2525 if (idev) {
2526 if (idev->if_flags & IF_READY)
2527 /* device is already configured. */
2528 break;
2529 idev->if_flags |= IF_READY;
2530 }
2531
2532 printk(KERN_INFO
2533 "ADDRCONF(NETDEV_CHANGE): %s: "
2534 "link becomes ready\n",
2535 dev->name);
2536
2537 run_pending = 1;
2538 }
2539
2540 switch (dev->type) {
2541 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2542 case ARPHRD_SIT:
2543 addrconf_sit_config(dev);
2544 break;
2545 #endif
2546 case ARPHRD_TUNNEL6:
2547 addrconf_ip6_tnl_config(dev);
2548 break;
2549 case ARPHRD_LOOPBACK:
2550 init_loopback(dev);
2551 break;
2552
2553 default:
2554 addrconf_dev_config(dev);
2555 break;
2556 }
2557
2558 if (idev) {
2559 if (run_pending)
2560 addrconf_dad_run(idev);
2561
2562 /*
2563 * If the MTU changed during the interface down,
2564 * when the interface up, the changed MTU must be
2565 * reflected in the idev as well as routers.
2566 */
2567 if (idev->cnf.mtu6 != dev->mtu &&
2568 dev->mtu >= IPV6_MIN_MTU) {
2569 rt6_mtu_change(dev, dev->mtu);
2570 idev->cnf.mtu6 = dev->mtu;
2571 }
2572 idev->tstamp = jiffies;
2573 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2574
2575 /*
2576 * If the changed mtu during down is lower than
2577 * IPV6_MIN_MTU stop IPv6 on this interface.
2578 */
2579 if (dev->mtu < IPV6_MIN_MTU)
2580 addrconf_ifdown(dev, 1);
2581 }
2582 break;
2583
2584 case NETDEV_CHANGEMTU:
2585 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2586 rt6_mtu_change(dev, dev->mtu);
2587 idev->cnf.mtu6 = dev->mtu;
2588 break;
2589 }
2590
2591 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2592 idev = ipv6_add_dev(dev);
2593 if (idev)
2594 break;
2595 }
2596
2597 /*
2598 * MTU falled under IPV6_MIN_MTU.
2599 * Stop IPv6 on this interface.
2600 */
2601
2602 case NETDEV_DOWN:
2603 case NETDEV_UNREGISTER:
2604 /*
2605 * Remove all addresses from this interface.
2606 */
2607 addrconf_ifdown(dev, event != NETDEV_DOWN);
2608 break;
2609
2610 case NETDEV_CHANGENAME:
2611 if (idev) {
2612 snmp6_unregister_dev(idev);
2613 addrconf_sysctl_unregister(idev);
2614 addrconf_sysctl_register(idev);
2615 err = snmp6_register_dev(idev);
2616 if (err)
2617 return notifier_from_errno(err);
2618 }
2619 break;
2620
2621 case NETDEV_PRE_TYPE_CHANGE:
2622 case NETDEV_POST_TYPE_CHANGE:
2623 addrconf_type_change(dev, event);
2624 break;
2625 }
2626
2627 return NOTIFY_OK;
2628 }
2629
2630 /*
2631 * addrconf module should be notified of a device going up
2632 */
2633 static struct notifier_block ipv6_dev_notf = {
2634 .notifier_call = addrconf_notify,
2635 };
2636
2637 static void addrconf_type_change(struct net_device *dev, unsigned long event)
2638 {
2639 struct inet6_dev *idev;
2640 ASSERT_RTNL();
2641
2642 idev = __in6_dev_get(dev);
2643
2644 if (event == NETDEV_POST_TYPE_CHANGE)
2645 ipv6_mc_remap(idev);
2646 else if (event == NETDEV_PRE_TYPE_CHANGE)
2647 ipv6_mc_unmap(idev);
2648 }
2649
2650 static int addrconf_ifdown(struct net_device *dev, int how)
2651 {
2652 struct net *net = dev_net(dev);
2653 struct inet6_dev *idev;
2654 struct inet6_ifaddr *ifa;
2655 int state, i;
2656
2657 ASSERT_RTNL();
2658
2659 rt6_ifdown(net, dev);
2660 neigh_ifdown(&nd_tbl, dev);
2661
2662 idev = __in6_dev_get(dev);
2663 if (idev == NULL)
2664 return -ENODEV;
2665
2666 /*
2667 * Step 1: remove reference to ipv6 device from parent device.
2668 * Do not dev_put!
2669 */
2670 if (how) {
2671 idev->dead = 1;
2672
2673 /* protected by rtnl_lock */
2674 rcu_assign_pointer(dev->ip6_ptr, NULL);
2675
2676 /* Step 1.5: remove snmp6 entry */
2677 snmp6_unregister_dev(idev);
2678
2679 }
2680
2681 /* Step 2: clear hash table */
2682 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
2683 struct hlist_head *h = &inet6_addr_lst[i];
2684 struct hlist_node *n;
2685
2686 spin_lock_bh(&addrconf_hash_lock);
2687 restart:
2688 hlist_for_each_entry_rcu(ifa, n, h, addr_lst) {
2689 if (ifa->idev == idev) {
2690 hlist_del_init_rcu(&ifa->addr_lst);
2691 addrconf_del_timer(ifa);
2692 goto restart;
2693 }
2694 }
2695 spin_unlock_bh(&addrconf_hash_lock);
2696 }
2697
2698 write_lock_bh(&idev->lock);
2699
2700 /* Step 2: clear flags for stateless addrconf */
2701 if (!how)
2702 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2703
2704 #ifdef CONFIG_IPV6_PRIVACY
2705 if (how && del_timer(&idev->regen_timer))
2706 in6_dev_put(idev);
2707
2708 /* Step 3: clear tempaddr list */
2709 while (!list_empty(&idev->tempaddr_list)) {
2710 ifa = list_first_entry(&idev->tempaddr_list,
2711 struct inet6_ifaddr, tmp_list);
2712 list_del(&ifa->tmp_list);
2713 write_unlock_bh(&idev->lock);
2714 spin_lock_bh(&ifa->lock);
2715
2716 if (ifa->ifpub) {
2717 in6_ifa_put(ifa->ifpub);
2718 ifa->ifpub = NULL;
2719 }
2720 spin_unlock_bh(&ifa->lock);
2721 in6_ifa_put(ifa);
2722 write_lock_bh(&idev->lock);
2723 }
2724 #endif
2725
2726 while (!list_empty(&idev->addr_list)) {
2727 ifa = list_first_entry(&idev->addr_list,
2728 struct inet6_ifaddr, if_list);
2729 addrconf_del_timer(ifa);
2730
2731 list_del(&ifa->if_list);
2732
2733 write_unlock_bh(&idev->lock);
2734
2735 spin_lock_bh(&ifa->state_lock);
2736 state = ifa->state;
2737 ifa->state = INET6_IFADDR_STATE_DEAD;
2738 spin_unlock_bh(&ifa->state_lock);
2739
2740 if (state != INET6_IFADDR_STATE_DEAD) {
2741 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2742 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2743 }
2744 in6_ifa_put(ifa);
2745
2746 write_lock_bh(&idev->lock);
2747 }
2748
2749 write_unlock_bh(&idev->lock);
2750
2751 /* Step 5: Discard multicast list */
2752 if (how)
2753 ipv6_mc_destroy_dev(idev);
2754 else
2755 ipv6_mc_down(idev);
2756
2757 idev->tstamp = jiffies;
2758
2759 /* Last: Shot the device (if unregistered) */
2760 if (how) {
2761 addrconf_sysctl_unregister(idev);
2762 neigh_parms_release(&nd_tbl, idev->nd_parms);
2763 neigh_ifdown(&nd_tbl, dev);
2764 in6_dev_put(idev);
2765 }
2766 return 0;
2767 }
2768
2769 static void addrconf_rs_timer(unsigned long data)
2770 {
2771 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2772 struct inet6_dev *idev = ifp->idev;
2773
2774 read_lock(&idev->lock);
2775 if (idev->dead || !(idev->if_flags & IF_READY))
2776 goto out;
2777
2778 if (idev->cnf.forwarding)
2779 goto out;
2780
2781 /* Announcement received after solicitation was sent */
2782 if (idev->if_flags & IF_RA_RCVD)
2783 goto out;
2784
2785 spin_lock(&ifp->lock);
2786 if (ifp->probes++ < idev->cnf.rtr_solicits) {
2787 /* The wait after the last probe can be shorter */
2788 addrconf_mod_timer(ifp, AC_RS,
2789 (ifp->probes == idev->cnf.rtr_solicits) ?
2790 idev->cnf.rtr_solicit_delay :
2791 idev->cnf.rtr_solicit_interval);
2792 spin_unlock(&ifp->lock);
2793
2794 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2795 } else {
2796 spin_unlock(&ifp->lock);
2797 /*
2798 * Note: we do not support deprecated "all on-link"
2799 * assumption any longer.
2800 */
2801 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2802 idev->dev->name);
2803 }
2804
2805 out:
2806 read_unlock(&idev->lock);
2807 in6_ifa_put(ifp);
2808 }
2809
2810 /*
2811 * Duplicate Address Detection
2812 */
2813 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2814 {
2815 unsigned long rand_num;
2816 struct inet6_dev *idev = ifp->idev;
2817
2818 if (ifp->flags & IFA_F_OPTIMISTIC)
2819 rand_num = 0;
2820 else
2821 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2822
2823 ifp->probes = idev->cnf.dad_transmits;
2824 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2825 }
2826
2827 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2828 {
2829 struct inet6_dev *idev = ifp->idev;
2830 struct net_device *dev = idev->dev;
2831
2832 addrconf_join_solict(dev, &ifp->addr);
2833
2834 net_srandom(ifp->addr.s6_addr32[3]);
2835
2836 read_lock_bh(&idev->lock);
2837 spin_lock(&ifp->lock);
2838 if (ifp->state == INET6_IFADDR_STATE_DEAD)
2839 goto out;
2840
2841 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2842 idev->cnf.accept_dad < 1 ||
2843 !(ifp->flags&IFA_F_TENTATIVE) ||
2844 ifp->flags & IFA_F_NODAD) {
2845 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
2846 spin_unlock(&ifp->lock);
2847 read_unlock_bh(&idev->lock);
2848
2849 addrconf_dad_completed(ifp);
2850 return;
2851 }
2852
2853 if (!(idev->if_flags & IF_READY)) {
2854 spin_unlock(&ifp->lock);
2855 read_unlock_bh(&idev->lock);
2856 /*
2857 * If the device is not ready:
2858 * - keep it tentative if it is a permanent address.
2859 * - otherwise, kill it.
2860 */
2861 in6_ifa_hold(ifp);
2862 addrconf_dad_stop(ifp, 0);
2863 return;
2864 }
2865
2866 /*
2867 * Optimistic nodes can start receiving
2868 * Frames right away
2869 */
2870 if (ifp->flags & IFA_F_OPTIMISTIC)
2871 ip6_ins_rt(ifp->rt);
2872
2873 addrconf_dad_kick(ifp);
2874 out:
2875 spin_unlock(&ifp->lock);
2876 read_unlock_bh(&idev->lock);
2877 }
2878
2879 static void addrconf_dad_timer(unsigned long data)
2880 {
2881 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2882 struct inet6_dev *idev = ifp->idev;
2883 struct in6_addr mcaddr;
2884
2885 if (!ifp->probes && addrconf_dad_end(ifp))
2886 goto out;
2887
2888 read_lock(&idev->lock);
2889 if (idev->dead || !(idev->if_flags & IF_READY)) {
2890 read_unlock(&idev->lock);
2891 goto out;
2892 }
2893
2894 spin_lock(&ifp->lock);
2895 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
2896 spin_unlock(&ifp->lock);
2897 read_unlock(&idev->lock);
2898 goto out;
2899 }
2900
2901 if (ifp->probes == 0) {
2902 /*
2903 * DAD was successful
2904 */
2905
2906 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
2907 spin_unlock(&ifp->lock);
2908 read_unlock(&idev->lock);
2909
2910 addrconf_dad_completed(ifp);
2911
2912 goto out;
2913 }
2914
2915 ifp->probes--;
2916 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2917 spin_unlock(&ifp->lock);
2918 read_unlock(&idev->lock);
2919
2920 /* send a neighbour solicitation for our addr */
2921 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2922 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
2923 out:
2924 in6_ifa_put(ifp);
2925 }
2926
2927 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2928 {
2929 struct net_device *dev = ifp->idev->dev;
2930
2931 /*
2932 * Configure the address for reception. Now it is valid.
2933 */
2934
2935 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2936
2937 /* If added prefix is link local and forwarding is off,
2938 start sending router solicitations.
2939 */
2940
2941 if ((ifp->idev->cnf.forwarding == 0 ||
2942 ifp->idev->cnf.forwarding == 2) &&
2943 ifp->idev->cnf.rtr_solicits > 0 &&
2944 (dev->flags&IFF_LOOPBACK) == 0 &&
2945 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2946 /*
2947 * If a host as already performed a random delay
2948 * [...] as part of DAD [...] there is no need
2949 * to delay again before sending the first RS
2950 */
2951 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2952
2953 spin_lock_bh(&ifp->lock);
2954 ifp->probes = 1;
2955 ifp->idev->if_flags |= IF_RS_SENT;
2956 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2957 spin_unlock_bh(&ifp->lock);
2958 }
2959 }
2960
2961 static void addrconf_dad_run(struct inet6_dev *idev)
2962 {
2963 struct inet6_ifaddr *ifp;
2964
2965 read_lock_bh(&idev->lock);
2966 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2967 spin_lock(&ifp->lock);
2968 if (ifp->flags & IFA_F_TENTATIVE &&
2969 ifp->state == INET6_IFADDR_STATE_DAD)
2970 addrconf_dad_kick(ifp);
2971 spin_unlock(&ifp->lock);
2972 }
2973 read_unlock_bh(&idev->lock);
2974 }
2975
2976 #ifdef CONFIG_PROC_FS
2977 struct if6_iter_state {
2978 struct seq_net_private p;
2979 int bucket;
2980 };
2981
2982 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2983 {
2984 struct inet6_ifaddr *ifa = NULL;
2985 struct if6_iter_state *state = seq->private;
2986 struct net *net = seq_file_net(seq);
2987
2988 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2989 struct hlist_node *n;
2990 hlist_for_each_entry_rcu_bh(ifa, n, &inet6_addr_lst[state->bucket],
2991 addr_lst)
2992 if (net_eq(dev_net(ifa->idev->dev), net))
2993 return ifa;
2994 }
2995 return NULL;
2996 }
2997
2998 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
2999 struct inet6_ifaddr *ifa)
3000 {
3001 struct if6_iter_state *state = seq->private;
3002 struct net *net = seq_file_net(seq);
3003 struct hlist_node *n = &ifa->addr_lst;
3004
3005 hlist_for_each_entry_continue_rcu_bh(ifa, n, addr_lst)
3006 if (net_eq(dev_net(ifa->idev->dev), net))
3007 return ifa;
3008
3009 while (++state->bucket < IN6_ADDR_HSIZE) {
3010 hlist_for_each_entry_rcu_bh(ifa, n,
3011 &inet6_addr_lst[state->bucket], addr_lst) {
3012 if (net_eq(dev_net(ifa->idev->dev), net))
3013 return ifa;
3014 }
3015 }
3016
3017 return NULL;
3018 }
3019
3020 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
3021 {
3022 struct inet6_ifaddr *ifa = if6_get_first(seq);
3023
3024 if (ifa)
3025 while (pos && (ifa = if6_get_next(seq, ifa)) != NULL)
3026 --pos;
3027 return pos ? NULL : ifa;
3028 }
3029
3030 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3031 __acquires(rcu_bh)
3032 {
3033 rcu_read_lock_bh();
3034 return if6_get_idx(seq, *pos);
3035 }
3036
3037 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3038 {
3039 struct inet6_ifaddr *ifa;
3040
3041 ifa = if6_get_next(seq, v);
3042 ++*pos;
3043 return ifa;
3044 }
3045
3046 static void if6_seq_stop(struct seq_file *seq, void *v)
3047 __releases(rcu_bh)
3048 {
3049 rcu_read_unlock_bh();
3050 }
3051
3052 static int if6_seq_show(struct seq_file *seq, void *v)
3053 {
3054 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3055 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3056 &ifp->addr,
3057 ifp->idev->dev->ifindex,
3058 ifp->prefix_len,
3059 ifp->scope,
3060 ifp->flags,
3061 ifp->idev->dev->name);
3062 return 0;
3063 }
3064
3065 static const struct seq_operations if6_seq_ops = {
3066 .start = if6_seq_start,
3067 .next = if6_seq_next,
3068 .show = if6_seq_show,
3069 .stop = if6_seq_stop,
3070 };
3071
3072 static int if6_seq_open(struct inode *inode, struct file *file)
3073 {
3074 return seq_open_net(inode, file, &if6_seq_ops,
3075 sizeof(struct if6_iter_state));
3076 }
3077
3078 static const struct file_operations if6_fops = {
3079 .owner = THIS_MODULE,
3080 .open = if6_seq_open,
3081 .read = seq_read,
3082 .llseek = seq_lseek,
3083 .release = seq_release_net,
3084 };
3085
3086 static int __net_init if6_proc_net_init(struct net *net)
3087 {
3088 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
3089 return -ENOMEM;
3090 return 0;
3091 }
3092
3093 static void __net_exit if6_proc_net_exit(struct net *net)
3094 {
3095 proc_net_remove(net, "if_inet6");
3096 }
3097
3098 static struct pernet_operations if6_proc_net_ops = {
3099 .init = if6_proc_net_init,
3100 .exit = if6_proc_net_exit,
3101 };
3102
3103 int __init if6_proc_init(void)
3104 {
3105 return register_pernet_subsys(&if6_proc_net_ops);
3106 }
3107
3108 void if6_proc_exit(void)
3109 {
3110 unregister_pernet_subsys(&if6_proc_net_ops);
3111 }
3112 #endif /* CONFIG_PROC_FS */
3113
3114 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3115 /* Check if address is a home address configured on any interface. */
3116 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3117 {
3118 int ret = 0;
3119 struct inet6_ifaddr *ifp = NULL;
3120 struct hlist_node *n;
3121 unsigned int hash = ipv6_addr_hash(addr);
3122
3123 rcu_read_lock_bh();
3124 hlist_for_each_entry_rcu_bh(ifp, n, &inet6_addr_lst[hash], addr_lst) {
3125 if (!net_eq(dev_net(ifp->idev->dev), net))
3126 continue;
3127 if (ipv6_addr_equal(&ifp->addr, addr) &&
3128 (ifp->flags & IFA_F_HOMEADDRESS)) {
3129 ret = 1;
3130 break;
3131 }
3132 }
3133 rcu_read_unlock_bh();
3134 return ret;
3135 }
3136 #endif
3137
3138 /*
3139 * Periodic address status verification
3140 */
3141
3142 static void addrconf_verify(unsigned long foo)
3143 {
3144 unsigned long now, next, next_sec, next_sched;
3145 struct inet6_ifaddr *ifp;
3146 struct hlist_node *node;
3147 int i;
3148
3149 rcu_read_lock_bh();
3150 spin_lock(&addrconf_verify_lock);
3151 now = jiffies;
3152 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3153
3154 del_timer(&addr_chk_timer);
3155
3156 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3157 restart:
3158 hlist_for_each_entry_rcu_bh(ifp, node,
3159 &inet6_addr_lst[i], addr_lst) {
3160 unsigned long age;
3161
3162 if (ifp->flags & IFA_F_PERMANENT)
3163 continue;
3164
3165 spin_lock(&ifp->lock);
3166 /* We try to batch several events at once. */
3167 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3168
3169 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3170 age >= ifp->valid_lft) {
3171 spin_unlock(&ifp->lock);
3172 in6_ifa_hold(ifp);
3173 ipv6_del_addr(ifp);
3174 goto restart;
3175 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3176 spin_unlock(&ifp->lock);
3177 continue;
3178 } else if (age >= ifp->prefered_lft) {
3179 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3180 int deprecate = 0;
3181
3182 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3183 deprecate = 1;
3184 ifp->flags |= IFA_F_DEPRECATED;
3185 }
3186
3187 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3188 next = ifp->tstamp + ifp->valid_lft * HZ;
3189
3190 spin_unlock(&ifp->lock);
3191
3192 if (deprecate) {
3193 in6_ifa_hold(ifp);
3194
3195 ipv6_ifa_notify(0, ifp);
3196 in6_ifa_put(ifp);
3197 goto restart;
3198 }
3199 #ifdef CONFIG_IPV6_PRIVACY
3200 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3201 !(ifp->flags&IFA_F_TENTATIVE)) {
3202 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3203 ifp->idev->cnf.dad_transmits *
3204 ifp->idev->nd_parms->retrans_time / HZ;
3205
3206 if (age >= ifp->prefered_lft - regen_advance) {
3207 struct inet6_ifaddr *ifpub = ifp->ifpub;
3208 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3209 next = ifp->tstamp + ifp->prefered_lft * HZ;
3210 if (!ifp->regen_count && ifpub) {
3211 ifp->regen_count++;
3212 in6_ifa_hold(ifp);
3213 in6_ifa_hold(ifpub);
3214 spin_unlock(&ifp->lock);
3215
3216 spin_lock(&ifpub->lock);
3217 ifpub->regen_count = 0;
3218 spin_unlock(&ifpub->lock);
3219 ipv6_create_tempaddr(ifpub, ifp);
3220 in6_ifa_put(ifpub);
3221 in6_ifa_put(ifp);
3222 goto restart;
3223 }
3224 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3225 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3226 spin_unlock(&ifp->lock);
3227 #endif
3228 } else {
3229 /* ifp->prefered_lft <= ifp->valid_lft */
3230 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3231 next = ifp->tstamp + ifp->prefered_lft * HZ;
3232 spin_unlock(&ifp->lock);
3233 }
3234 }
3235 }
3236
3237 next_sec = round_jiffies_up(next);
3238 next_sched = next;
3239
3240 /* If rounded timeout is accurate enough, accept it. */
3241 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3242 next_sched = next_sec;
3243
3244 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3245 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3246 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3247
3248 ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3249 now, next, next_sec, next_sched));
3250
3251 addr_chk_timer.expires = next_sched;
3252 add_timer(&addr_chk_timer);
3253 spin_unlock(&addrconf_verify_lock);
3254 rcu_read_unlock_bh();
3255 }
3256
3257 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3258 {
3259 struct in6_addr *pfx = NULL;
3260
3261 if (addr)
3262 pfx = nla_data(addr);
3263
3264 if (local) {
3265 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3266 pfx = NULL;
3267 else
3268 pfx = nla_data(local);
3269 }
3270
3271 return pfx;
3272 }
3273
3274 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3275 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3276 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3277 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3278 };
3279
3280 static int
3281 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3282 {
3283 struct net *net = sock_net(skb->sk);
3284 struct ifaddrmsg *ifm;
3285 struct nlattr *tb[IFA_MAX+1];
3286 struct in6_addr *pfx;
3287 int err;
3288
3289 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3290 if (err < 0)
3291 return err;
3292
3293 ifm = nlmsg_data(nlh);
3294 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3295 if (pfx == NULL)
3296 return -EINVAL;
3297
3298 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3299 }
3300
3301 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3302 u32 prefered_lft, u32 valid_lft)
3303 {
3304 u32 flags;
3305 clock_t expires;
3306 unsigned long timeout;
3307
3308 if (!valid_lft || (prefered_lft > valid_lft))
3309 return -EINVAL;
3310
3311 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3312 if (addrconf_finite_timeout(timeout)) {
3313 expires = jiffies_to_clock_t(timeout * HZ);
3314 valid_lft = timeout;
3315 flags = RTF_EXPIRES;
3316 } else {
3317 expires = 0;
3318 flags = 0;
3319 ifa_flags |= IFA_F_PERMANENT;
3320 }
3321
3322 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3323 if (addrconf_finite_timeout(timeout)) {
3324 if (timeout == 0)
3325 ifa_flags |= IFA_F_DEPRECATED;
3326 prefered_lft = timeout;
3327 }
3328
3329 spin_lock_bh(&ifp->lock);
3330 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3331 ifp->tstamp = jiffies;
3332 ifp->valid_lft = valid_lft;
3333 ifp->prefered_lft = prefered_lft;
3334
3335 spin_unlock_bh(&ifp->lock);
3336 if (!(ifp->flags&IFA_F_TENTATIVE))
3337 ipv6_ifa_notify(0, ifp);
3338
3339 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3340 expires, flags);
3341 addrconf_verify(0);
3342
3343 return 0;
3344 }
3345
3346 static int
3347 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3348 {
3349 struct net *net = sock_net(skb->sk);
3350 struct ifaddrmsg *ifm;
3351 struct nlattr *tb[IFA_MAX+1];
3352 struct in6_addr *pfx;
3353 struct inet6_ifaddr *ifa;
3354 struct net_device *dev;
3355 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3356 u8 ifa_flags;
3357 int err;
3358
3359 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3360 if (err < 0)
3361 return err;
3362
3363 ifm = nlmsg_data(nlh);
3364 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3365 if (pfx == NULL)
3366 return -EINVAL;
3367
3368 if (tb[IFA_CACHEINFO]) {
3369 struct ifa_cacheinfo *ci;
3370
3371 ci = nla_data(tb[IFA_CACHEINFO]);
3372 valid_lft = ci->ifa_valid;
3373 preferred_lft = ci->ifa_prefered;
3374 } else {
3375 preferred_lft = INFINITY_LIFE_TIME;
3376 valid_lft = INFINITY_LIFE_TIME;
3377 }
3378
3379 dev = __dev_get_by_index(net, ifm->ifa_index);
3380 if (dev == NULL)
3381 return -ENODEV;
3382
3383 /* We ignore other flags so far. */
3384 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3385
3386 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3387 if (ifa == NULL) {
3388 /*
3389 * It would be best to check for !NLM_F_CREATE here but
3390 * userspace alreay relies on not having to provide this.
3391 */
3392 return inet6_addr_add(net, ifm->ifa_index, pfx,
3393 ifm->ifa_prefixlen, ifa_flags,
3394 preferred_lft, valid_lft);
3395 }
3396
3397 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3398 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3399 err = -EEXIST;
3400 else
3401 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3402
3403 in6_ifa_put(ifa);
3404
3405 return err;
3406 }
3407
3408 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3409 u8 scope, int ifindex)
3410 {
3411 struct ifaddrmsg *ifm;
3412
3413 ifm = nlmsg_data(nlh);
3414 ifm->ifa_family = AF_INET6;
3415 ifm->ifa_prefixlen = prefixlen;
3416 ifm->ifa_flags = flags;
3417 ifm->ifa_scope = scope;
3418 ifm->ifa_index = ifindex;
3419 }
3420
3421 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3422 unsigned long tstamp, u32 preferred, u32 valid)
3423 {
3424 struct ifa_cacheinfo ci;
3425
3426 ci.cstamp = cstamp_delta(cstamp);
3427 ci.tstamp = cstamp_delta(tstamp);
3428 ci.ifa_prefered = preferred;
3429 ci.ifa_valid = valid;
3430
3431 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3432 }
3433
3434 static inline int rt_scope(int ifa_scope)
3435 {
3436 if (ifa_scope & IFA_HOST)
3437 return RT_SCOPE_HOST;
3438 else if (ifa_scope & IFA_LINK)
3439 return RT_SCOPE_LINK;
3440 else if (ifa_scope & IFA_SITE)
3441 return RT_SCOPE_SITE;
3442 else
3443 return RT_SCOPE_UNIVERSE;
3444 }
3445
3446 static inline int inet6_ifaddr_msgsize(void)
3447 {
3448 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3449 + nla_total_size(16) /* IFA_ADDRESS */
3450 + nla_total_size(sizeof(struct ifa_cacheinfo));
3451 }
3452
3453 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3454 u32 pid, u32 seq, int event, unsigned int flags)
3455 {
3456 struct nlmsghdr *nlh;
3457 u32 preferred, valid;
3458
3459 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3460 if (nlh == NULL)
3461 return -EMSGSIZE;
3462
3463 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3464 ifa->idev->dev->ifindex);
3465
3466 if (!(ifa->flags&IFA_F_PERMANENT)) {
3467 preferred = ifa->prefered_lft;
3468 valid = ifa->valid_lft;
3469 if (preferred != INFINITY_LIFE_TIME) {
3470 long tval = (jiffies - ifa->tstamp)/HZ;
3471 if (preferred > tval)
3472 preferred -= tval;
3473 else
3474 preferred = 0;
3475 if (valid != INFINITY_LIFE_TIME) {
3476 if (valid > tval)
3477 valid -= tval;
3478 else
3479 valid = 0;
3480 }
3481 }
3482 } else {
3483 preferred = INFINITY_LIFE_TIME;
3484 valid = INFINITY_LIFE_TIME;
3485 }
3486
3487 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3488 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3489 nlmsg_cancel(skb, nlh);
3490 return -EMSGSIZE;
3491 }
3492
3493 return nlmsg_end(skb, nlh);
3494 }
3495
3496 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3497 u32 pid, u32 seq, int event, u16 flags)
3498 {
3499 struct nlmsghdr *nlh;
3500 u8 scope = RT_SCOPE_UNIVERSE;
3501 int ifindex = ifmca->idev->dev->ifindex;
3502
3503 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3504 scope = RT_SCOPE_SITE;
3505
3506 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3507 if (nlh == NULL)
3508 return -EMSGSIZE;
3509
3510 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3511 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3512 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3513 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3514 nlmsg_cancel(skb, nlh);
3515 return -EMSGSIZE;
3516 }
3517
3518 return nlmsg_end(skb, nlh);
3519 }
3520
3521 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3522 u32 pid, u32 seq, int event, unsigned int flags)
3523 {
3524 struct nlmsghdr *nlh;
3525 u8 scope = RT_SCOPE_UNIVERSE;
3526 int ifindex = ifaca->aca_idev->dev->ifindex;
3527
3528 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3529 scope = RT_SCOPE_SITE;
3530
3531 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3532 if (nlh == NULL)
3533 return -EMSGSIZE;
3534
3535 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3536 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3537 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3538 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3539 nlmsg_cancel(skb, nlh);
3540 return -EMSGSIZE;
3541 }
3542
3543 return nlmsg_end(skb, nlh);
3544 }
3545
3546 enum addr_type_t {
3547 UNICAST_ADDR,
3548 MULTICAST_ADDR,
3549 ANYCAST_ADDR,
3550 };
3551
3552 /* called with rcu_read_lock() */
3553 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3554 struct netlink_callback *cb, enum addr_type_t type,
3555 int s_ip_idx, int *p_ip_idx)
3556 {
3557 struct ifmcaddr6 *ifmca;
3558 struct ifacaddr6 *ifaca;
3559 int err = 1;
3560 int ip_idx = *p_ip_idx;
3561
3562 read_lock_bh(&idev->lock);
3563 switch (type) {
3564 case UNICAST_ADDR: {
3565 struct inet6_ifaddr *ifa;
3566
3567 /* unicast address incl. temp addr */
3568 list_for_each_entry(ifa, &idev->addr_list, if_list) {
3569 if (++ip_idx < s_ip_idx)
3570 continue;
3571 err = inet6_fill_ifaddr(skb, ifa,
3572 NETLINK_CB(cb->skb).pid,
3573 cb->nlh->nlmsg_seq,
3574 RTM_NEWADDR,
3575 NLM_F_MULTI);
3576 if (err <= 0)
3577 break;
3578 }
3579 break;
3580 }
3581 case MULTICAST_ADDR:
3582 /* multicast address */
3583 for (ifmca = idev->mc_list; ifmca;
3584 ifmca = ifmca->next, ip_idx++) {
3585 if (ip_idx < s_ip_idx)
3586 continue;
3587 err = inet6_fill_ifmcaddr(skb, ifmca,
3588 NETLINK_CB(cb->skb).pid,
3589 cb->nlh->nlmsg_seq,
3590 RTM_GETMULTICAST,
3591 NLM_F_MULTI);
3592 if (err <= 0)
3593 break;
3594 }
3595 break;
3596 case ANYCAST_ADDR:
3597 /* anycast address */
3598 for (ifaca = idev->ac_list; ifaca;
3599 ifaca = ifaca->aca_next, ip_idx++) {
3600 if (ip_idx < s_ip_idx)
3601 continue;
3602 err = inet6_fill_ifacaddr(skb, ifaca,
3603 NETLINK_CB(cb->skb).pid,
3604 cb->nlh->nlmsg_seq,
3605 RTM_GETANYCAST,
3606 NLM_F_MULTI);
3607 if (err <= 0)
3608 break;
3609 }
3610 break;
3611 default:
3612 break;
3613 }
3614 read_unlock_bh(&idev->lock);
3615 *p_ip_idx = ip_idx;
3616 return err;
3617 }
3618
3619 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3620 enum addr_type_t type)
3621 {
3622 struct net *net = sock_net(skb->sk);
3623 int h, s_h;
3624 int idx, ip_idx;
3625 int s_idx, s_ip_idx;
3626 struct net_device *dev;
3627 struct inet6_dev *idev;
3628 struct hlist_head *head;
3629 struct hlist_node *node;
3630
3631 s_h = cb->args[0];
3632 s_idx = idx = cb->args[1];
3633 s_ip_idx = ip_idx = cb->args[2];
3634
3635 rcu_read_lock();
3636 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3637 idx = 0;
3638 head = &net->dev_index_head[h];
3639 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3640 if (idx < s_idx)
3641 goto cont;
3642 if (h > s_h || idx > s_idx)
3643 s_ip_idx = 0;
3644 ip_idx = 0;
3645 idev = __in6_dev_get(dev);
3646 if (!idev)
3647 goto cont;
3648
3649 if (in6_dump_addrs(idev, skb, cb, type,
3650 s_ip_idx, &ip_idx) <= 0)
3651 goto done;
3652 cont:
3653 idx++;
3654 }
3655 }
3656 done:
3657 rcu_read_unlock();
3658 cb->args[0] = h;
3659 cb->args[1] = idx;
3660 cb->args[2] = ip_idx;
3661
3662 return skb->len;
3663 }
3664
3665 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3666 {
3667 enum addr_type_t type = UNICAST_ADDR;
3668
3669 return inet6_dump_addr(skb, cb, type);
3670 }
3671
3672 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3673 {
3674 enum addr_type_t type = MULTICAST_ADDR;
3675
3676 return inet6_dump_addr(skb, cb, type);
3677 }
3678
3679
3680 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3681 {
3682 enum addr_type_t type = ANYCAST_ADDR;
3683
3684 return inet6_dump_addr(skb, cb, type);
3685 }
3686
3687 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3688 void *arg)
3689 {
3690 struct net *net = sock_net(in_skb->sk);
3691 struct ifaddrmsg *ifm;
3692 struct nlattr *tb[IFA_MAX+1];
3693 struct in6_addr *addr = NULL;
3694 struct net_device *dev = NULL;
3695 struct inet6_ifaddr *ifa;
3696 struct sk_buff *skb;
3697 int err;
3698
3699 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3700 if (err < 0)
3701 goto errout;
3702
3703 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3704 if (addr == NULL) {
3705 err = -EINVAL;
3706 goto errout;
3707 }
3708
3709 ifm = nlmsg_data(nlh);
3710 if (ifm->ifa_index)
3711 dev = __dev_get_by_index(net, ifm->ifa_index);
3712
3713 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
3714 if (!ifa) {
3715 err = -EADDRNOTAVAIL;
3716 goto errout;
3717 }
3718
3719 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
3720 if (!skb) {
3721 err = -ENOBUFS;
3722 goto errout_ifa;
3723 }
3724
3725 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3726 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3727 if (err < 0) {
3728 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3729 WARN_ON(err == -EMSGSIZE);
3730 kfree_skb(skb);
3731 goto errout_ifa;
3732 }
3733 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
3734 errout_ifa:
3735 in6_ifa_put(ifa);
3736 errout:
3737 return err;
3738 }
3739
3740 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3741 {
3742 struct sk_buff *skb;
3743 struct net *net = dev_net(ifa->idev->dev);
3744 int err = -ENOBUFS;
3745
3746 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3747 if (skb == NULL)
3748 goto errout;
3749
3750 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3751 if (err < 0) {
3752 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3753 WARN_ON(err == -EMSGSIZE);
3754 kfree_skb(skb);
3755 goto errout;
3756 }
3757 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3758 return;
3759 errout:
3760 if (err < 0)
3761 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3762 }
3763
3764 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3765 __s32 *array, int bytes)
3766 {
3767 BUG_ON(bytes < (DEVCONF_MAX * 4));
3768
3769 memset(array, 0, bytes);
3770 array[DEVCONF_FORWARDING] = cnf->forwarding;
3771 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3772 array[DEVCONF_MTU6] = cnf->mtu6;
3773 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3774 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3775 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3776 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3777 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3778 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
3779 jiffies_to_msecs(cnf->rtr_solicit_interval);
3780 array[DEVCONF_RTR_SOLICIT_DELAY] =
3781 jiffies_to_msecs(cnf->rtr_solicit_delay);
3782 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3783 #ifdef CONFIG_IPV6_PRIVACY
3784 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3785 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3786 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3787 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3788 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3789 #endif
3790 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3791 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3792 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3793 #ifdef CONFIG_IPV6_ROUTER_PREF
3794 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3795 array[DEVCONF_RTR_PROBE_INTERVAL] =
3796 jiffies_to_msecs(cnf->rtr_probe_interval);
3797 #ifdef CONFIG_IPV6_ROUTE_INFO
3798 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3799 #endif
3800 #endif
3801 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3802 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3803 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3804 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3805 #endif
3806 #ifdef CONFIG_IPV6_MROUTE
3807 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
3808 #endif
3809 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
3810 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
3811 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
3812 }
3813
3814 static inline size_t inet6_ifla6_size(void)
3815 {
3816 return nla_total_size(4) /* IFLA_INET6_FLAGS */
3817 + nla_total_size(sizeof(struct ifla_cacheinfo))
3818 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3819 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3820 + nla_total_size(ICMP6_MIB_MAX * 8); /* IFLA_INET6_ICMP6STATS */
3821 }
3822
3823 static inline size_t inet6_if_nlmsg_size(void)
3824 {
3825 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3826 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3827 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3828 + nla_total_size(4) /* IFLA_MTU */
3829 + nla_total_size(4) /* IFLA_LINK */
3830 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
3831 }
3832
3833 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
3834 int items, int bytes)
3835 {
3836 int i;
3837 int pad = bytes - sizeof(u64) * items;
3838 BUG_ON(pad < 0);
3839
3840 /* Use put_unaligned() because stats may not be aligned for u64. */
3841 put_unaligned(items, &stats[0]);
3842 for (i = 1; i < items; i++)
3843 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
3844
3845 memset(&stats[items], 0, pad);
3846 }
3847
3848 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib,
3849 int items, int bytes, size_t syncpoff)
3850 {
3851 int i;
3852 int pad = bytes - sizeof(u64) * items;
3853 BUG_ON(pad < 0);
3854
3855 /* Use put_unaligned() because stats may not be aligned for u64. */
3856 put_unaligned(items, &stats[0]);
3857 for (i = 1; i < items; i++)
3858 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
3859
3860 memset(&stats[items], 0, pad);
3861 }
3862
3863 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3864 int bytes)
3865 {
3866 switch (attrtype) {
3867 case IFLA_INET6_STATS:
3868 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6,
3869 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
3870 break;
3871 case IFLA_INET6_ICMP6STATS:
3872 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
3873 break;
3874 }
3875 }
3876
3877 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
3878 {
3879 struct nlattr *nla;
3880 struct ifla_cacheinfo ci;
3881
3882 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
3883
3884 ci.max_reasm_len = IPV6_MAXPLEN;
3885 ci.tstamp = cstamp_delta(idev->tstamp);
3886 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
3887 ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time);
3888 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3889
3890 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3891 if (nla == NULL)
3892 goto nla_put_failure;
3893 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
3894
3895 /* XXX - MC not implemented */
3896
3897 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3898 if (nla == NULL)
3899 goto nla_put_failure;
3900 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3901
3902 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3903 if (nla == NULL)
3904 goto nla_put_failure;
3905 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
3906
3907 return 0;
3908
3909 nla_put_failure:
3910 return -EMSGSIZE;
3911 }
3912
3913 static size_t inet6_get_link_af_size(const struct net_device *dev)
3914 {
3915 if (!__in6_dev_get(dev))
3916 return 0;
3917
3918 return inet6_ifla6_size();
3919 }
3920
3921 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
3922 {
3923 struct inet6_dev *idev = __in6_dev_get(dev);
3924
3925 if (!idev)
3926 return -ENODATA;
3927
3928 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
3929 return -EMSGSIZE;
3930
3931 return 0;
3932 }
3933
3934 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3935 u32 pid, u32 seq, int event, unsigned int flags)
3936 {
3937 struct net_device *dev = idev->dev;
3938 struct ifinfomsg *hdr;
3939 struct nlmsghdr *nlh;
3940 void *protoinfo;
3941
3942 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3943 if (nlh == NULL)
3944 return -EMSGSIZE;
3945
3946 hdr = nlmsg_data(nlh);
3947 hdr->ifi_family = AF_INET6;
3948 hdr->__ifi_pad = 0;
3949 hdr->ifi_type = dev->type;
3950 hdr->ifi_index = dev->ifindex;
3951 hdr->ifi_flags = dev_get_flags(dev);
3952 hdr->ifi_change = 0;
3953
3954 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
3955
3956 if (dev->addr_len)
3957 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3958
3959 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
3960 if (dev->ifindex != dev->iflink)
3961 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
3962
3963 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3964 if (protoinfo == NULL)
3965 goto nla_put_failure;
3966
3967 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
3968 goto nla_put_failure;
3969
3970 nla_nest_end(skb, protoinfo);
3971 return nlmsg_end(skb, nlh);
3972
3973 nla_put_failure:
3974 nlmsg_cancel(skb, nlh);
3975 return -EMSGSIZE;
3976 }
3977
3978 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3979 {
3980 struct net *net = sock_net(skb->sk);
3981 int h, s_h;
3982 int idx = 0, s_idx;
3983 struct net_device *dev;
3984 struct inet6_dev *idev;
3985 struct hlist_head *head;
3986 struct hlist_node *node;
3987
3988 s_h = cb->args[0];
3989 s_idx = cb->args[1];
3990
3991 rcu_read_lock();
3992 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3993 idx = 0;
3994 head = &net->dev_index_head[h];
3995 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3996 if (idx < s_idx)
3997 goto cont;
3998 idev = __in6_dev_get(dev);
3999 if (!idev)
4000 goto cont;
4001 if (inet6_fill_ifinfo(skb, idev,
4002 NETLINK_CB(cb->skb).pid,
4003 cb->nlh->nlmsg_seq,
4004 RTM_NEWLINK, NLM_F_MULTI) <= 0)
4005 goto out;
4006 cont:
4007 idx++;
4008 }
4009 }
4010 out:
4011 rcu_read_unlock();
4012 cb->args[1] = idx;
4013 cb->args[0] = h;
4014
4015 return skb->len;
4016 }
4017
4018 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4019 {
4020 struct sk_buff *skb;
4021 struct net *net = dev_net(idev->dev);
4022 int err = -ENOBUFS;
4023
4024 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
4025 if (skb == NULL)
4026 goto errout;
4027
4028 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
4029 if (err < 0) {
4030 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4031 WARN_ON(err == -EMSGSIZE);
4032 kfree_skb(skb);
4033 goto errout;
4034 }
4035 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
4036 return;
4037 errout:
4038 if (err < 0)
4039 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
4040 }
4041
4042 static inline size_t inet6_prefix_nlmsg_size(void)
4043 {
4044 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4045 + nla_total_size(sizeof(struct in6_addr))
4046 + nla_total_size(sizeof(struct prefix_cacheinfo));
4047 }
4048
4049 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
4050 struct prefix_info *pinfo, u32 pid, u32 seq,
4051 int event, unsigned int flags)
4052 {
4053 struct prefixmsg *pmsg;
4054 struct nlmsghdr *nlh;
4055 struct prefix_cacheinfo ci;
4056
4057 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
4058 if (nlh == NULL)
4059 return -EMSGSIZE;
4060
4061 pmsg = nlmsg_data(nlh);
4062 pmsg->prefix_family = AF_INET6;
4063 pmsg->prefix_pad1 = 0;
4064 pmsg->prefix_pad2 = 0;
4065 pmsg->prefix_ifindex = idev->dev->ifindex;
4066 pmsg->prefix_len = pinfo->prefix_len;
4067 pmsg->prefix_type = pinfo->type;
4068 pmsg->prefix_pad3 = 0;
4069 pmsg->prefix_flags = 0;
4070 if (pinfo->onlink)
4071 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4072 if (pinfo->autoconf)
4073 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4074
4075 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
4076
4077 ci.preferred_time = ntohl(pinfo->prefered);
4078 ci.valid_time = ntohl(pinfo->valid);
4079 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
4080
4081 return nlmsg_end(skb, nlh);
4082
4083 nla_put_failure:
4084 nlmsg_cancel(skb, nlh);
4085 return -EMSGSIZE;
4086 }
4087
4088 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
4089 struct prefix_info *pinfo)
4090 {
4091 struct sk_buff *skb;
4092 struct net *net = dev_net(idev->dev);
4093 int err = -ENOBUFS;
4094
4095 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
4096 if (skb == NULL)
4097 goto errout;
4098
4099 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
4100 if (err < 0) {
4101 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4102 WARN_ON(err == -EMSGSIZE);
4103 kfree_skb(skb);
4104 goto errout;
4105 }
4106 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4107 return;
4108 errout:
4109 if (err < 0)
4110 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
4111 }
4112
4113 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4114 {
4115 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4116
4117 switch (event) {
4118 case RTM_NEWADDR:
4119 /*
4120 * If the address was optimistic
4121 * we inserted the route at the start of
4122 * our DAD process, so we don't need
4123 * to do it again
4124 */
4125 if (!(ifp->rt->rt6i_node))
4126 ip6_ins_rt(ifp->rt);
4127 if (ifp->idev->cnf.forwarding)
4128 addrconf_join_anycast(ifp);
4129 break;
4130 case RTM_DELADDR:
4131 if (ifp->idev->cnf.forwarding)
4132 addrconf_leave_anycast(ifp);
4133 addrconf_leave_solict(ifp->idev, &ifp->addr);
4134 dst_hold(&ifp->rt->dst);
4135
4136 if (ip6_del_rt(ifp->rt))
4137 dst_free(&ifp->rt->dst);
4138 break;
4139 }
4140 }
4141
4142 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4143 {
4144 rcu_read_lock_bh();
4145 if (likely(ifp->idev->dead == 0))
4146 __ipv6_ifa_notify(event, ifp);
4147 rcu_read_unlock_bh();
4148 }
4149
4150 #ifdef CONFIG_SYSCTL
4151
4152 static
4153 int addrconf_sysctl_forward(ctl_table *ctl, int write,
4154 void __user *buffer, size_t *lenp, loff_t *ppos)
4155 {
4156 int *valp = ctl->data;
4157 int val = *valp;
4158 loff_t pos = *ppos;
4159 int ret;
4160
4161 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
4162
4163 if (write)
4164 ret = addrconf_fixup_forwarding(ctl, valp, val);
4165 if (ret)
4166 *ppos = pos;
4167 return ret;
4168 }
4169
4170 static void dev_disable_change(struct inet6_dev *idev)
4171 {
4172 if (!idev || !idev->dev)
4173 return;
4174
4175 if (idev->cnf.disable_ipv6)
4176 addrconf_notify(NULL, NETDEV_DOWN, idev->dev);
4177 else
4178 addrconf_notify(NULL, NETDEV_UP, idev->dev);
4179 }
4180
4181 static void addrconf_disable_change(struct net *net, __s32 newf)
4182 {
4183 struct net_device *dev;
4184 struct inet6_dev *idev;
4185
4186 rcu_read_lock();
4187 for_each_netdev_rcu(net, dev) {
4188 idev = __in6_dev_get(dev);
4189 if (idev) {
4190 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4191 idev->cnf.disable_ipv6 = newf;
4192 if (changed)
4193 dev_disable_change(idev);
4194 }
4195 }
4196 rcu_read_unlock();
4197 }
4198
4199 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int old)
4200 {
4201 struct net *net;
4202
4203 net = (struct net *)table->extra2;
4204
4205 if (p == &net->ipv6.devconf_dflt->disable_ipv6)
4206 return 0;
4207
4208 if (!rtnl_trylock()) {
4209 /* Restore the original values before restarting */
4210 *p = old;
4211 return restart_syscall();
4212 }
4213
4214 if (p == &net->ipv6.devconf_all->disable_ipv6) {
4215 __s32 newf = net->ipv6.devconf_all->disable_ipv6;
4216 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4217 addrconf_disable_change(net, newf);
4218 } else if ((!*p) ^ (!old))
4219 dev_disable_change((struct inet6_dev *)table->extra1);
4220
4221 rtnl_unlock();
4222 return 0;
4223 }
4224
4225 static
4226 int addrconf_sysctl_disable(ctl_table *ctl, int write,
4227 void __user *buffer, size_t *lenp, loff_t *ppos)
4228 {
4229 int *valp = ctl->data;
4230 int val = *valp;
4231 loff_t pos = *ppos;
4232 int ret;
4233
4234 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
4235
4236 if (write)
4237 ret = addrconf_disable_ipv6(ctl, valp, val);
4238 if (ret)
4239 *ppos = pos;
4240 return ret;
4241 }
4242
4243 static struct addrconf_sysctl_table
4244 {
4245 struct ctl_table_header *sysctl_header;
4246 ctl_table addrconf_vars[DEVCONF_MAX+1];
4247 char *dev_name;
4248 } addrconf_sysctl __read_mostly = {
4249 .sysctl_header = NULL,
4250 .addrconf_vars = {
4251 {
4252 .procname = "forwarding",
4253 .data = &ipv6_devconf.forwarding,
4254 .maxlen = sizeof(int),
4255 .mode = 0644,
4256 .proc_handler = addrconf_sysctl_forward,
4257 },
4258 {
4259 .procname = "hop_limit",
4260 .data = &ipv6_devconf.hop_limit,
4261 .maxlen = sizeof(int),
4262 .mode = 0644,
4263 .proc_handler = proc_dointvec,
4264 },
4265 {
4266 .procname = "mtu",
4267 .data = &ipv6_devconf.mtu6,
4268 .maxlen = sizeof(int),
4269 .mode = 0644,
4270 .proc_handler = proc_dointvec,
4271 },
4272 {
4273 .procname = "accept_ra",
4274 .data = &ipv6_devconf.accept_ra,
4275 .maxlen = sizeof(int),
4276 .mode = 0644,
4277 .proc_handler = proc_dointvec,
4278 },
4279 {
4280 .procname = "accept_redirects",
4281 .data = &ipv6_devconf.accept_redirects,
4282 .maxlen = sizeof(int),
4283 .mode = 0644,
4284 .proc_handler = proc_dointvec,
4285 },
4286 {
4287 .procname = "autoconf",
4288 .data = &ipv6_devconf.autoconf,
4289 .maxlen = sizeof(int),
4290 .mode = 0644,
4291 .proc_handler = proc_dointvec,
4292 },
4293 {
4294 .procname = "dad_transmits",
4295 .data = &ipv6_devconf.dad_transmits,
4296 .maxlen = sizeof(int),
4297 .mode = 0644,
4298 .proc_handler = proc_dointvec,
4299 },
4300 {
4301 .procname = "router_solicitations",
4302 .data = &ipv6_devconf.rtr_solicits,
4303 .maxlen = sizeof(int),
4304 .mode = 0644,
4305 .proc_handler = proc_dointvec,
4306 },
4307 {
4308 .procname = "router_solicitation_interval",
4309 .data = &ipv6_devconf.rtr_solicit_interval,
4310 .maxlen = sizeof(int),
4311 .mode = 0644,
4312 .proc_handler = proc_dointvec_jiffies,
4313 },
4314 {
4315 .procname = "router_solicitation_delay",
4316 .data = &ipv6_devconf.rtr_solicit_delay,
4317 .maxlen = sizeof(int),
4318 .mode = 0644,
4319 .proc_handler = proc_dointvec_jiffies,
4320 },
4321 {
4322 .procname = "force_mld_version",
4323 .data = &ipv6_devconf.force_mld_version,
4324 .maxlen = sizeof(int),
4325 .mode = 0644,
4326 .proc_handler = proc_dointvec,
4327 },
4328 #ifdef CONFIG_IPV6_PRIVACY
4329 {
4330 .procname = "use_tempaddr",
4331 .data = &ipv6_devconf.use_tempaddr,
4332 .maxlen = sizeof(int),
4333 .mode = 0644,
4334 .proc_handler = proc_dointvec,
4335 },
4336 {
4337 .procname = "temp_valid_lft",
4338 .data = &ipv6_devconf.temp_valid_lft,
4339 .maxlen = sizeof(int),
4340 .mode = 0644,
4341 .proc_handler = proc_dointvec,
4342 },
4343 {
4344 .procname = "temp_prefered_lft",
4345 .data = &ipv6_devconf.temp_prefered_lft,
4346 .maxlen = sizeof(int),
4347 .mode = 0644,
4348 .proc_handler = proc_dointvec,
4349 },
4350 {
4351 .procname = "regen_max_retry",
4352 .data = &ipv6_devconf.regen_max_retry,
4353 .maxlen = sizeof(int),
4354 .mode = 0644,
4355 .proc_handler = proc_dointvec,
4356 },
4357 {
4358 .procname = "max_desync_factor",
4359 .data = &ipv6_devconf.max_desync_factor,
4360 .maxlen = sizeof(int),
4361 .mode = 0644,
4362 .proc_handler = proc_dointvec,
4363 },
4364 #endif
4365 {
4366 .procname = "max_addresses",
4367 .data = &ipv6_devconf.max_addresses,
4368 .maxlen = sizeof(int),
4369 .mode = 0644,
4370 .proc_handler = proc_dointvec,
4371 },
4372 {
4373 .procname = "accept_ra_defrtr",
4374 .data = &ipv6_devconf.accept_ra_defrtr,
4375 .maxlen = sizeof(int),
4376 .mode = 0644,
4377 .proc_handler = proc_dointvec,
4378 },
4379 {
4380 .procname = "accept_ra_pinfo",
4381 .data = &ipv6_devconf.accept_ra_pinfo,
4382 .maxlen = sizeof(int),
4383 .mode = 0644,
4384 .proc_handler = proc_dointvec,
4385 },
4386 #ifdef CONFIG_IPV6_ROUTER_PREF
4387 {
4388 .procname = "accept_ra_rtr_pref",
4389 .data = &ipv6_devconf.accept_ra_rtr_pref,
4390 .maxlen = sizeof(int),
4391 .mode = 0644,
4392 .proc_handler = proc_dointvec,
4393 },
4394 {
4395 .procname = "router_probe_interval",
4396 .data = &ipv6_devconf.rtr_probe_interval,
4397 .maxlen = sizeof(int),
4398 .mode = 0644,
4399 .proc_handler = proc_dointvec_jiffies,
4400 },
4401 #ifdef CONFIG_IPV6_ROUTE_INFO
4402 {
4403 .procname = "accept_ra_rt_info_max_plen",
4404 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4405 .maxlen = sizeof(int),
4406 .mode = 0644,
4407 .proc_handler = proc_dointvec,
4408 },
4409 #endif
4410 #endif
4411 {
4412 .procname = "proxy_ndp",
4413 .data = &ipv6_devconf.proxy_ndp,
4414 .maxlen = sizeof(int),
4415 .mode = 0644,
4416 .proc_handler = proc_dointvec,
4417 },
4418 {
4419 .procname = "accept_source_route",
4420 .data = &ipv6_devconf.accept_source_route,
4421 .maxlen = sizeof(int),
4422 .mode = 0644,
4423 .proc_handler = proc_dointvec,
4424 },
4425 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4426 {
4427 .procname = "optimistic_dad",
4428 .data = &ipv6_devconf.optimistic_dad,
4429 .maxlen = sizeof(int),
4430 .mode = 0644,
4431 .proc_handler = proc_dointvec,
4432
4433 },
4434 #endif
4435 #ifdef CONFIG_IPV6_MROUTE
4436 {
4437 .procname = "mc_forwarding",
4438 .data = &ipv6_devconf.mc_forwarding,
4439 .maxlen = sizeof(int),
4440 .mode = 0444,
4441 .proc_handler = proc_dointvec,
4442 },
4443 #endif
4444 {
4445 .procname = "disable_ipv6",
4446 .data = &ipv6_devconf.disable_ipv6,
4447 .maxlen = sizeof(int),
4448 .mode = 0644,
4449 .proc_handler = addrconf_sysctl_disable,
4450 },
4451 {
4452 .procname = "accept_dad",
4453 .data = &ipv6_devconf.accept_dad,
4454 .maxlen = sizeof(int),
4455 .mode = 0644,
4456 .proc_handler = proc_dointvec,
4457 },
4458 {
4459 .procname = "force_tllao",
4460 .data = &ipv6_devconf.force_tllao,
4461 .maxlen = sizeof(int),
4462 .mode = 0644,
4463 .proc_handler = proc_dointvec
4464 },
4465 {
4466 /* sentinel */
4467 }
4468 },
4469 };
4470
4471 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4472 struct inet6_dev *idev, struct ipv6_devconf *p)
4473 {
4474 int i;
4475 struct addrconf_sysctl_table *t;
4476
4477 #define ADDRCONF_CTL_PATH_DEV 3
4478
4479 struct ctl_path addrconf_ctl_path[] = {
4480 { .procname = "net", },
4481 { .procname = "ipv6", },
4482 { .procname = "conf", },
4483 { /* to be set */ },
4484 { },
4485 };
4486
4487
4488 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4489 if (t == NULL)
4490 goto out;
4491
4492 for (i = 0; t->addrconf_vars[i].data; i++) {
4493 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
4494 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4495 t->addrconf_vars[i].extra2 = net;
4496 }
4497
4498 /*
4499 * Make a copy of dev_name, because '.procname' is regarded as const
4500 * by sysctl and we wouldn't want anyone to change it under our feet
4501 * (see SIOCSIFNAME).
4502 */
4503 t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4504 if (!t->dev_name)
4505 goto free;
4506
4507 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
4508
4509 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
4510 t->addrconf_vars);
4511 if (t->sysctl_header == NULL)
4512 goto free_procname;
4513
4514 p->sysctl = t;
4515 return 0;
4516
4517 free_procname:
4518 kfree(t->dev_name);
4519 free:
4520 kfree(t);
4521 out:
4522 return -ENOBUFS;
4523 }
4524
4525 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4526 {
4527 struct addrconf_sysctl_table *t;
4528
4529 if (p->sysctl == NULL)
4530 return;
4531
4532 t = p->sysctl;
4533 p->sysctl = NULL;
4534 unregister_net_sysctl_table(t->sysctl_header);
4535 kfree(t->dev_name);
4536 kfree(t);
4537 }
4538
4539 static void addrconf_sysctl_register(struct inet6_dev *idev)
4540 {
4541 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
4542 &ndisc_ifinfo_sysctl_change);
4543 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
4544 idev, &idev->cnf);
4545 }
4546
4547 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
4548 {
4549 __addrconf_sysctl_unregister(&idev->cnf);
4550 neigh_sysctl_unregister(idev->nd_parms);
4551 }
4552
4553
4554 #endif
4555
4556 static int __net_init addrconf_init_net(struct net *net)
4557 {
4558 int err;
4559 struct ipv6_devconf *all, *dflt;
4560
4561 err = -ENOMEM;
4562 all = &ipv6_devconf;
4563 dflt = &ipv6_devconf_dflt;
4564
4565 if (!net_eq(net, &init_net)) {
4566 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4567 if (all == NULL)
4568 goto err_alloc_all;
4569
4570 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4571 if (dflt == NULL)
4572 goto err_alloc_dflt;
4573 } else {
4574 /* these will be inherited by all namespaces */
4575 dflt->autoconf = ipv6_defaults.autoconf;
4576 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
4577 }
4578
4579 net->ipv6.devconf_all = all;
4580 net->ipv6.devconf_dflt = dflt;
4581
4582 #ifdef CONFIG_SYSCTL
4583 err = __addrconf_sysctl_register(net, "all", NULL, all);
4584 if (err < 0)
4585 goto err_reg_all;
4586
4587 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
4588 if (err < 0)
4589 goto err_reg_dflt;
4590 #endif
4591 return 0;
4592
4593 #ifdef CONFIG_SYSCTL
4594 err_reg_dflt:
4595 __addrconf_sysctl_unregister(all);
4596 err_reg_all:
4597 kfree(dflt);
4598 #endif
4599 err_alloc_dflt:
4600 kfree(all);
4601 err_alloc_all:
4602 return err;
4603 }
4604
4605 static void __net_exit addrconf_exit_net(struct net *net)
4606 {
4607 #ifdef CONFIG_SYSCTL
4608 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4609 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4610 #endif
4611 if (!net_eq(net, &init_net)) {
4612 kfree(net->ipv6.devconf_dflt);
4613 kfree(net->ipv6.devconf_all);
4614 }
4615 }
4616
4617 static struct pernet_operations addrconf_ops = {
4618 .init = addrconf_init_net,
4619 .exit = addrconf_exit_net,
4620 };
4621
4622 /*
4623 * Device notifier
4624 */
4625
4626 int register_inet6addr_notifier(struct notifier_block *nb)
4627 {
4628 return atomic_notifier_chain_register(&inet6addr_chain, nb);
4629 }
4630 EXPORT_SYMBOL(register_inet6addr_notifier);
4631
4632 int unregister_inet6addr_notifier(struct notifier_block *nb)
4633 {
4634 return atomic_notifier_chain_unregister(&inet6addr_chain, nb);
4635 }
4636 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4637
4638 static struct rtnl_af_ops inet6_ops = {
4639 .family = AF_INET6,
4640 .fill_link_af = inet6_fill_link_af,
4641 .get_link_af_size = inet6_get_link_af_size,
4642 };
4643
4644 /*
4645 * Init / cleanup code
4646 */
4647
4648 int __init addrconf_init(void)
4649 {
4650 int i, err;
4651
4652 err = ipv6_addr_label_init();
4653 if (err < 0) {
4654 printk(KERN_CRIT "IPv6 Addrconf:"
4655 " cannot initialize default policy table: %d.\n", err);
4656 goto out;
4657 }
4658
4659 err = register_pernet_subsys(&addrconf_ops);
4660 if (err < 0)
4661 goto out_addrlabel;
4662
4663 /* The addrconf netdev notifier requires that loopback_dev
4664 * has it's ipv6 private information allocated and setup
4665 * before it can bring up and give link-local addresses
4666 * to other devices which are up.
4667 *
4668 * Unfortunately, loopback_dev is not necessarily the first
4669 * entry in the global dev_base list of net devices. In fact,
4670 * it is likely to be the very last entry on that list.
4671 * So this causes the notifier registry below to try and
4672 * give link-local addresses to all devices besides loopback_dev
4673 * first, then loopback_dev, which cases all the non-loopback_dev
4674 * devices to fail to get a link-local address.
4675 *
4676 * So, as a temporary fix, allocate the ipv6 structure for
4677 * loopback_dev first by hand.
4678 * Longer term, all of the dependencies ipv6 has upon the loopback
4679 * device and it being up should be removed.
4680 */
4681 rtnl_lock();
4682 if (!ipv6_add_dev(init_net.loopback_dev))
4683 err = -ENOMEM;
4684 rtnl_unlock();
4685 if (err)
4686 goto errlo;
4687
4688 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4689 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
4690
4691 register_netdevice_notifier(&ipv6_dev_notf);
4692
4693 addrconf_verify(0);
4694
4695 err = rtnl_af_register(&inet6_ops);
4696 if (err < 0)
4697 goto errout_af;
4698
4699 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4700 if (err < 0)
4701 goto errout;
4702
4703 /* Only the first call to __rtnl_register can fail */
4704 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4705 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4706 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4707 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4708 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4709
4710 ipv6_addr_label_rtnl_register();
4711
4712 return 0;
4713 errout:
4714 rtnl_af_unregister(&inet6_ops);
4715 errout_af:
4716 unregister_netdevice_notifier(&ipv6_dev_notf);
4717 errlo:
4718 unregister_pernet_subsys(&addrconf_ops);
4719 out_addrlabel:
4720 ipv6_addr_label_cleanup();
4721 out:
4722 return err;
4723 }
4724
4725 void addrconf_cleanup(void)
4726 {
4727 struct net_device *dev;
4728 int i;
4729
4730 unregister_netdevice_notifier(&ipv6_dev_notf);
4731 unregister_pernet_subsys(&addrconf_ops);
4732 ipv6_addr_label_cleanup();
4733
4734 rtnl_lock();
4735
4736 __rtnl_af_unregister(&inet6_ops);
4737
4738 /* clean dev list */
4739 for_each_netdev(&init_net, dev) {
4740 if (__in6_dev_get(dev) == NULL)
4741 continue;
4742 addrconf_ifdown(dev, 1);
4743 }
4744 addrconf_ifdown(init_net.loopback_dev, 2);
4745
4746 /*
4747 * Check hash table.
4748 */
4749 spin_lock_bh(&addrconf_hash_lock);
4750 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4751 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
4752 spin_unlock_bh(&addrconf_hash_lock);
4753
4754 del_timer(&addr_chk_timer);
4755 rtnl_unlock();
4756 }
Linux with added FPC-III support