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ACPICA: Update version to 20100806
[linux-2.6/x86.git] / net / ipv6 / addrconf.c
blob324fac3b6c16db0238d1139649038bcaa9aaced2
1 /*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 */
14
15 /*
16 * Changes:
17 *
18 * Janos Farkas : delete timer on ifdown
19 * <chexum@bankinf.banki.hu>
20 * Andi Kleen : kill double kfree on module
21 * unload.
22 * Maciej W. Rozycki : FDDI support
23 * sekiya@USAGI : Don't send too many RS
24 * packets.
25 * yoshfuji@USAGI : Fixed interval between DAD
26 * packets.
27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
28 * address validation timer.
29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
30 * support.
31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
32 * address on a same interface.
33 * YOSHIFUJI Hideaki @USAGI : ARCnet support
34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
35 * seq_file.
36 * YOSHIFUJI Hideaki @USAGI : improved source address
37 * selection; consider scope,
38 * status etc.
39 */
40
41 #include <linux/errno.h>
42 #include <linux/types.h>
43 #include <linux/kernel.h>
44 #include <linux/socket.h>
45 #include <linux/sockios.h>
46 #include <linux/net.h>
47 #include <linux/in6.h>
48 #include <linux/netdevice.h>
49 #include <linux/if_addr.h>
50 #include <linux/if_arp.h>
51 #include <linux/if_arcnet.h>
52 #include <linux/if_infiniband.h>
53 #include <linux/route.h>
54 #include <linux/inetdevice.h>
55 #include <linux/init.h>
56 #include <linux/slab.h>
57 #ifdef CONFIG_SYSCTL
58 #include <linux/sysctl.h>
59 #endif
60 #include <linux/capability.h>
61 #include <linux/delay.h>
62 #include <linux/notifier.h>
63 #include <linux/string.h>
64
65 #include <net/net_namespace.h>
66 #include <net/sock.h>
67 #include <net/snmp.h>
68
69 #include <net/ipv6.h>
70 #include <net/protocol.h>
71 #include <net/ndisc.h>
72 #include <net/ip6_route.h>
73 #include <net/addrconf.h>
74 #include <net/tcp.h>
75 #include <net/ip.h>
76 #include <net/netlink.h>
77 #include <net/pkt_sched.h>
78 #include <linux/if_tunnel.h>
79 #include <linux/rtnetlink.h>
80
81 #ifdef CONFIG_IPV6_PRIVACY
82 #include <linux/random.h>
83 #endif
84
85 #include <linux/uaccess.h>
86 #include <asm/unaligned.h>
87
88 #include <linux/proc_fs.h>
89 #include <linux/seq_file.h>
90
91 /* Set to 3 to get tracing... */
92 #define ACONF_DEBUG 2
93
94 #if ACONF_DEBUG >= 3
95 #define ADBG(x) printk x
96 #else
97 #define ADBG(x)
98 #endif
99
100 #define INFINITY_LIFE_TIME 0xFFFFFFFF
101 #define TIME_DELTA(a, b) ((unsigned long)((long)(a) - (long)(b)))
102
103 #define ADDRCONF_TIMER_FUZZ_MINUS (HZ > 50 ? HZ/50 : 1)
104 #define ADDRCONF_TIMER_FUZZ (HZ / 4)
105 #define ADDRCONF_TIMER_FUZZ_MAX (HZ)
106
107 #ifdef CONFIG_SYSCTL
108 static void addrconf_sysctl_register(struct inet6_dev *idev);
109 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
110 #else
111 static inline void addrconf_sysctl_register(struct inet6_dev *idev)
112 {
113 }
114
115 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
116 {
117 }
118 #endif
119
120 #ifdef CONFIG_IPV6_PRIVACY
121 static int __ipv6_regen_rndid(struct inet6_dev *idev);
122 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
123 static void ipv6_regen_rndid(unsigned long data);
124 #endif
125
126 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
127 static int ipv6_count_addresses(struct inet6_dev *idev);
128
129 /*
130 * Configured unicast address hash table
131 */
132 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
133 static DEFINE_SPINLOCK(addrconf_hash_lock);
134
135 static void addrconf_verify(unsigned long);
136
137 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
138 static DEFINE_SPINLOCK(addrconf_verify_lock);
139
140 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
141 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
142
143 static void addrconf_type_change(struct net_device *dev,
144 unsigned long event);
145 static int addrconf_ifdown(struct net_device *dev, int how);
146
147 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
148 static void addrconf_dad_timer(unsigned long data);
149 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
150 static void addrconf_dad_run(struct inet6_dev *idev);
151 static void addrconf_rs_timer(unsigned long data);
152 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
153 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
154
155 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
156 struct prefix_info *pinfo);
157 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
158 struct net_device *dev);
159
160 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
161
162 static struct ipv6_devconf ipv6_devconf __read_mostly = {
163 .forwarding = 0,
164 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
165 .mtu6 = IPV6_MIN_MTU,
166 .accept_ra = 1,
167 .accept_redirects = 1,
168 .autoconf = 1,
169 .force_mld_version = 0,
170 .dad_transmits = 1,
171 .rtr_solicits = MAX_RTR_SOLICITATIONS,
172 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
173 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
174 #ifdef CONFIG_IPV6_PRIVACY
175 .use_tempaddr = 0,
176 .temp_valid_lft = TEMP_VALID_LIFETIME,
177 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
178 .regen_max_retry = REGEN_MAX_RETRY,
179 .max_desync_factor = MAX_DESYNC_FACTOR,
180 #endif
181 .max_addresses = IPV6_MAX_ADDRESSES,
182 .accept_ra_defrtr = 1,
183 .accept_ra_pinfo = 1,
184 #ifdef CONFIG_IPV6_ROUTER_PREF
185 .accept_ra_rtr_pref = 1,
186 .rtr_probe_interval = 60 * HZ,
187 #ifdef CONFIG_IPV6_ROUTE_INFO
188 .accept_ra_rt_info_max_plen = 0,
189 #endif
190 #endif
191 .proxy_ndp = 0,
192 .accept_source_route = 0, /* we do not accept RH0 by default. */
193 .disable_ipv6 = 0,
194 .accept_dad = 1,
195 };
196
197 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
198 .forwarding = 0,
199 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
200 .mtu6 = IPV6_MIN_MTU,
201 .accept_ra = 1,
202 .accept_redirects = 1,
203 .autoconf = 1,
204 .dad_transmits = 1,
205 .rtr_solicits = MAX_RTR_SOLICITATIONS,
206 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
207 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
208 #ifdef CONFIG_IPV6_PRIVACY
209 .use_tempaddr = 0,
210 .temp_valid_lft = TEMP_VALID_LIFETIME,
211 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
212 .regen_max_retry = REGEN_MAX_RETRY,
213 .max_desync_factor = MAX_DESYNC_FACTOR,
214 #endif
215 .max_addresses = IPV6_MAX_ADDRESSES,
216 .accept_ra_defrtr = 1,
217 .accept_ra_pinfo = 1,
218 #ifdef CONFIG_IPV6_ROUTER_PREF
219 .accept_ra_rtr_pref = 1,
220 .rtr_probe_interval = 60 * HZ,
221 #ifdef CONFIG_IPV6_ROUTE_INFO
222 .accept_ra_rt_info_max_plen = 0,
223 #endif
224 #endif
225 .proxy_ndp = 0,
226 .accept_source_route = 0, /* we do not accept RH0 by default. */
227 .disable_ipv6 = 0,
228 .accept_dad = 1,
229 };
230
231 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
232 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
233 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
234 const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
235 const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
236
237 /* Check if a valid qdisc is available */
238 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
239 {
240 return !qdisc_tx_is_noop(dev);
241 }
242
243 /* Check if a route is valid prefix route */
244 static inline int addrconf_is_prefix_route(const struct rt6_info *rt)
245 {
246 return ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0);
247 }
248
249 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
250 {
251 if (del_timer(&ifp->timer))
252 __in6_ifa_put(ifp);
253 }
254
255 enum addrconf_timer_t {
256 AC_NONE,
257 AC_DAD,
258 AC_RS,
259 };
260
261 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
262 enum addrconf_timer_t what,
263 unsigned long when)
264 {
265 if (!del_timer(&ifp->timer))
266 in6_ifa_hold(ifp);
267
268 switch (what) {
269 case AC_DAD:
270 ifp->timer.function = addrconf_dad_timer;
271 break;
272 case AC_RS:
273 ifp->timer.function = addrconf_rs_timer;
274 break;
275 default:
276 break;
277 }
278 ifp->timer.expires = jiffies + when;
279 add_timer(&ifp->timer);
280 }
281
282 static int snmp6_alloc_dev(struct inet6_dev *idev)
283 {
284 if (snmp_mib_init((void __percpu **)idev->stats.ipv6,
285 sizeof(struct ipstats_mib),
286 __alignof__(struct ipstats_mib)) < 0)
287 goto err_ip;
288 if (snmp_mib_init((void __percpu **)idev->stats.icmpv6,
289 sizeof(struct icmpv6_mib),
290 __alignof__(struct icmpv6_mib)) < 0)
291 goto err_icmp;
292 if (snmp_mib_init((void __percpu **)idev->stats.icmpv6msg,
293 sizeof(struct icmpv6msg_mib),
294 __alignof__(struct icmpv6msg_mib)) < 0)
295 goto err_icmpmsg;
296
297 return 0;
298
299 err_icmpmsg:
300 snmp_mib_free((void __percpu **)idev->stats.icmpv6);
301 err_icmp:
302 snmp_mib_free((void __percpu **)idev->stats.ipv6);
303 err_ip:
304 return -ENOMEM;
305 }
306
307 static void snmp6_free_dev(struct inet6_dev *idev)
308 {
309 snmp_mib_free((void __percpu **)idev->stats.icmpv6msg);
310 snmp_mib_free((void __percpu **)idev->stats.icmpv6);
311 snmp_mib_free((void __percpu **)idev->stats.ipv6);
312 }
313
314 /* Nobody refers to this device, we may destroy it. */
315
316 static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
317 {
318 struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
319 kfree(idev);
320 }
321
322 void in6_dev_finish_destroy(struct inet6_dev *idev)
323 {
324 struct net_device *dev = idev->dev;
325
326 WARN_ON(!list_empty(&idev->addr_list));
327 WARN_ON(idev->mc_list != NULL);
328
329 #ifdef NET_REFCNT_DEBUG
330 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
331 #endif
332 dev_put(dev);
333 if (!idev->dead) {
334 pr_warning("Freeing alive inet6 device %p\n", idev);
335 return;
336 }
337 snmp6_free_dev(idev);
338 call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
339 }
340
341 EXPORT_SYMBOL(in6_dev_finish_destroy);
342
343 static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
344 {
345 struct inet6_dev *ndev;
346
347 ASSERT_RTNL();
348
349 if (dev->mtu < IPV6_MIN_MTU)
350 return NULL;
351
352 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
353
354 if (ndev == NULL)
355 return NULL;
356
357 rwlock_init(&ndev->lock);
358 ndev->dev = dev;
359 INIT_LIST_HEAD(&ndev->addr_list);
360
361 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
362 ndev->cnf.mtu6 = dev->mtu;
363 ndev->cnf.sysctl = NULL;
364 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
365 if (ndev->nd_parms == NULL) {
366 kfree(ndev);
367 return NULL;
368 }
369 if (ndev->cnf.forwarding)
370 dev_disable_lro(dev);
371 /* We refer to the device */
372 dev_hold(dev);
373
374 if (snmp6_alloc_dev(ndev) < 0) {
375 ADBG((KERN_WARNING
376 "%s(): cannot allocate memory for statistics; dev=%s.\n",
377 __func__, dev->name));
378 neigh_parms_release(&nd_tbl, ndev->nd_parms);
379 ndev->dead = 1;
380 in6_dev_finish_destroy(ndev);
381 return NULL;
382 }
383
384 if (snmp6_register_dev(ndev) < 0) {
385 ADBG((KERN_WARNING
386 "%s(): cannot create /proc/net/dev_snmp6/%s\n",
387 __func__, dev->name));
388 neigh_parms_release(&nd_tbl, ndev->nd_parms);
389 ndev->dead = 1;
390 in6_dev_finish_destroy(ndev);
391 return NULL;
392 }
393
394 /* One reference from device. We must do this before
395 * we invoke __ipv6_regen_rndid().
396 */
397 in6_dev_hold(ndev);
398
399 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
400 ndev->cnf.accept_dad = -1;
401
402 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
403 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
404 printk(KERN_INFO
405 "%s: Disabled Multicast RS\n",
406 dev->name);
407 ndev->cnf.rtr_solicits = 0;
408 }
409 #endif
410
411 #ifdef CONFIG_IPV6_PRIVACY
412 INIT_LIST_HEAD(&ndev->tempaddr_list);
413 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
414 if ((dev->flags&IFF_LOOPBACK) ||
415 dev->type == ARPHRD_TUNNEL ||
416 dev->type == ARPHRD_TUNNEL6 ||
417 dev->type == ARPHRD_SIT ||
418 dev->type == ARPHRD_NONE) {
419 printk(KERN_INFO
420 "%s: Disabled Privacy Extensions\n",
421 dev->name);
422 ndev->cnf.use_tempaddr = -1;
423 } else {
424 in6_dev_hold(ndev);
425 ipv6_regen_rndid((unsigned long) ndev);
426 }
427 #endif
428
429 if (netif_running(dev) && addrconf_qdisc_ok(dev))
430 ndev->if_flags |= IF_READY;
431
432 ipv6_mc_init_dev(ndev);
433 ndev->tstamp = jiffies;
434 addrconf_sysctl_register(ndev);
435 /* protected by rtnl_lock */
436 rcu_assign_pointer(dev->ip6_ptr, ndev);
437
438 /* Join all-node multicast group */
439 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
440
441 return ndev;
442 }
443
444 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
445 {
446 struct inet6_dev *idev;
447
448 ASSERT_RTNL();
449
450 idev = __in6_dev_get(dev);
451 if (!idev) {
452 idev = ipv6_add_dev(dev);
453 if (!idev)
454 return NULL;
455 }
456
457 if (dev->flags&IFF_UP)
458 ipv6_mc_up(idev);
459 return idev;
460 }
461
462 #ifdef CONFIG_SYSCTL
463 static void dev_forward_change(struct inet6_dev *idev)
464 {
465 struct net_device *dev;
466 struct inet6_ifaddr *ifa;
467
468 if (!idev)
469 return;
470 dev = idev->dev;
471 if (idev->cnf.forwarding)
472 dev_disable_lro(dev);
473 if (dev && (dev->flags & IFF_MULTICAST)) {
474 if (idev->cnf.forwarding)
475 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
476 else
477 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
478 }
479
480 list_for_each_entry(ifa, &idev->addr_list, if_list) {
481 if (ifa->flags&IFA_F_TENTATIVE)
482 continue;
483 if (idev->cnf.forwarding)
484 addrconf_join_anycast(ifa);
485 else
486 addrconf_leave_anycast(ifa);
487 }
488 }
489
490
491 static void addrconf_forward_change(struct net *net, __s32 newf)
492 {
493 struct net_device *dev;
494 struct inet6_dev *idev;
495
496 rcu_read_lock();
497 for_each_netdev_rcu(net, dev) {
498 idev = __in6_dev_get(dev);
499 if (idev) {
500 int changed = (!idev->cnf.forwarding) ^ (!newf);
501 idev->cnf.forwarding = newf;
502 if (changed)
503 dev_forward_change(idev);
504 }
505 }
506 rcu_read_unlock();
507 }
508
509 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old)
510 {
511 struct net *net;
512
513 net = (struct net *)table->extra2;
514 if (p == &net->ipv6.devconf_dflt->forwarding)
515 return 0;
516
517 if (!rtnl_trylock()) {
518 /* Restore the original values before restarting */
519 *p = old;
520 return restart_syscall();
521 }
522
523 if (p == &net->ipv6.devconf_all->forwarding) {
524 __s32 newf = net->ipv6.devconf_all->forwarding;
525 net->ipv6.devconf_dflt->forwarding = newf;
526 addrconf_forward_change(net, newf);
527 } else if ((!*p) ^ (!old))
528 dev_forward_change((struct inet6_dev *)table->extra1);
529 rtnl_unlock();
530
531 if (*p)
532 rt6_purge_dflt_routers(net);
533 return 1;
534 }
535 #endif
536
537 static void inet6_ifa_finish_destroy_rcu(struct rcu_head *head)
538 {
539 struct inet6_ifaddr *ifp = container_of(head, struct inet6_ifaddr, rcu);
540 kfree(ifp);
541 }
542
543 /* Nobody refers to this ifaddr, destroy it */
544 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
545 {
546 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
547
548 #ifdef NET_REFCNT_DEBUG
549 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
550 #endif
551
552 in6_dev_put(ifp->idev);
553
554 if (del_timer(&ifp->timer))
555 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp);
556
557 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
558 pr_warning("Freeing alive inet6 address %p\n", ifp);
559 return;
560 }
561 dst_release(&ifp->rt->dst);
562
563 call_rcu(&ifp->rcu, inet6_ifa_finish_destroy_rcu);
564 }
565
566 static void
567 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
568 {
569 struct list_head *p;
570 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
571
572 /*
573 * Each device address list is sorted in order of scope -
574 * global before linklocal.
575 */
576 list_for_each(p, &idev->addr_list) {
577 struct inet6_ifaddr *ifa
578 = list_entry(p, struct inet6_ifaddr, if_list);
579 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
580 break;
581 }
582
583 list_add_tail(&ifp->if_list, p);
584 }
585
586 static u32 ipv6_addr_hash(const struct in6_addr *addr)
587 {
588 /*
589 * We perform the hash function over the last 64 bits of the address
590 * This will include the IEEE address token on links that support it.
591 */
592 return jhash_2words((__force u32)addr->s6_addr32[2],
593 (__force u32)addr->s6_addr32[3], 0)
594 & (IN6_ADDR_HSIZE - 1);
595 }
596
597 /* On success it returns ifp with increased reference count */
598
599 static struct inet6_ifaddr *
600 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
601 int scope, u32 flags)
602 {
603 struct inet6_ifaddr *ifa = NULL;
604 struct rt6_info *rt;
605 unsigned int hash;
606 int err = 0;
607 int addr_type = ipv6_addr_type(addr);
608
609 if (addr_type == IPV6_ADDR_ANY ||
610 addr_type & IPV6_ADDR_MULTICAST ||
611 (!(idev->dev->flags & IFF_LOOPBACK) &&
612 addr_type & IPV6_ADDR_LOOPBACK))
613 return ERR_PTR(-EADDRNOTAVAIL);
614
615 rcu_read_lock_bh();
616 if (idev->dead) {
617 err = -ENODEV; /*XXX*/
618 goto out2;
619 }
620
621 if (idev->cnf.disable_ipv6) {
622 err = -EACCES;
623 goto out2;
624 }
625
626 spin_lock(&addrconf_hash_lock);
627
628 /* Ignore adding duplicate addresses on an interface */
629 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
630 ADBG(("ipv6_add_addr: already assigned\n"));
631 err = -EEXIST;
632 goto out;
633 }
634
635 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
636
637 if (ifa == NULL) {
638 ADBG(("ipv6_add_addr: malloc failed\n"));
639 err = -ENOBUFS;
640 goto out;
641 }
642
643 rt = addrconf_dst_alloc(idev, addr, 0);
644 if (IS_ERR(rt)) {
645 err = PTR_ERR(rt);
646 goto out;
647 }
648
649 ipv6_addr_copy(&ifa->addr, addr);
650
651 spin_lock_init(&ifa->lock);
652 spin_lock_init(&ifa->state_lock);
653 init_timer(&ifa->timer);
654 INIT_HLIST_NODE(&ifa->addr_lst);
655 ifa->timer.data = (unsigned long) ifa;
656 ifa->scope = scope;
657 ifa->prefix_len = pfxlen;
658 ifa->flags = flags | IFA_F_TENTATIVE;
659 ifa->cstamp = ifa->tstamp = jiffies;
660
661 ifa->rt = rt;
662
663 /*
664 * part one of RFC 4429, section 3.3
665 * We should not configure an address as
666 * optimistic if we do not yet know the link
667 * layer address of our nexhop router
668 */
669
670 if (rt->rt6i_nexthop == NULL)
671 ifa->flags &= ~IFA_F_OPTIMISTIC;
672
673 ifa->idev = idev;
674 in6_dev_hold(idev);
675 /* For caller */
676 in6_ifa_hold(ifa);
677
678 /* Add to big hash table */
679 hash = ipv6_addr_hash(addr);
680
681 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
682 spin_unlock(&addrconf_hash_lock);
683
684 write_lock(&idev->lock);
685 /* Add to inet6_dev unicast addr list. */
686 ipv6_link_dev_addr(idev, ifa);
687
688 #ifdef CONFIG_IPV6_PRIVACY
689 if (ifa->flags&IFA_F_TEMPORARY) {
690 list_add(&ifa->tmp_list, &idev->tempaddr_list);
691 in6_ifa_hold(ifa);
692 }
693 #endif
694
695 in6_ifa_hold(ifa);
696 write_unlock(&idev->lock);
697 out2:
698 rcu_read_unlock_bh();
699
700 if (likely(err == 0))
701 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
702 else {
703 kfree(ifa);
704 ifa = ERR_PTR(err);
705 }
706
707 return ifa;
708 out:
709 spin_unlock(&addrconf_hash_lock);
710 goto out2;
711 }
712
713 /* This function wants to get referenced ifp and releases it before return */
714
715 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
716 {
717 struct inet6_ifaddr *ifa, *ifn;
718 struct inet6_dev *idev = ifp->idev;
719 int state;
720 int hash;
721 int deleted = 0, onlink = 0;
722 unsigned long expires = jiffies;
723
724 hash = ipv6_addr_hash(&ifp->addr);
725
726 spin_lock_bh(&ifp->state_lock);
727 state = ifp->state;
728 ifp->state = INET6_IFADDR_STATE_DEAD;
729 spin_unlock_bh(&ifp->state_lock);
730
731 if (state == INET6_IFADDR_STATE_DEAD)
732 goto out;
733
734 spin_lock_bh(&addrconf_hash_lock);
735 hlist_del_init_rcu(&ifp->addr_lst);
736 spin_unlock_bh(&addrconf_hash_lock);
737
738 write_lock_bh(&idev->lock);
739 #ifdef CONFIG_IPV6_PRIVACY
740 if (ifp->flags&IFA_F_TEMPORARY) {
741 list_del(&ifp->tmp_list);
742 if (ifp->ifpub) {
743 in6_ifa_put(ifp->ifpub);
744 ifp->ifpub = NULL;
745 }
746 __in6_ifa_put(ifp);
747 }
748 #endif
749
750 list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) {
751 if (ifa == ifp) {
752 list_del_init(&ifp->if_list);
753 __in6_ifa_put(ifp);
754
755 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
756 break;
757 deleted = 1;
758 continue;
759 } else if (ifp->flags & IFA_F_PERMANENT) {
760 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
761 ifp->prefix_len)) {
762 if (ifa->flags & IFA_F_PERMANENT) {
763 onlink = 1;
764 if (deleted)
765 break;
766 } else {
767 unsigned long lifetime;
768
769 if (!onlink)
770 onlink = -1;
771
772 spin_lock(&ifa->lock);
773
774 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
775 /*
776 * Note: Because this address is
777 * not permanent, lifetime <
778 * LONG_MAX / HZ here.
779 */
780 if (time_before(expires,
781 ifa->tstamp + lifetime * HZ))
782 expires = ifa->tstamp + lifetime * HZ;
783 spin_unlock(&ifa->lock);
784 }
785 }
786 }
787 }
788 write_unlock_bh(&idev->lock);
789
790 addrconf_del_timer(ifp);
791
792 ipv6_ifa_notify(RTM_DELADDR, ifp);
793
794 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
795
796 /*
797 * Purge or update corresponding prefix
798 *
799 * 1) we don't purge prefix here if address was not permanent.
800 * prefix is managed by its own lifetime.
801 * 2) if there're no addresses, delete prefix.
802 * 3) if there're still other permanent address(es),
803 * corresponding prefix is still permanent.
804 * 4) otherwise, update prefix lifetime to the
805 * longest valid lifetime among the corresponding
806 * addresses on the device.
807 * Note: subsequent RA will update lifetime.
808 *
809 * --yoshfuji
810 */
811 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
812 struct in6_addr prefix;
813 struct rt6_info *rt;
814 struct net *net = dev_net(ifp->idev->dev);
815 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
816 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1);
817
818 if (rt && addrconf_is_prefix_route(rt)) {
819 if (onlink == 0) {
820 ip6_del_rt(rt);
821 rt = NULL;
822 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
823 rt->rt6i_expires = expires;
824 rt->rt6i_flags |= RTF_EXPIRES;
825 }
826 }
827 dst_release(&rt->dst);
828 }
829
830 out:
831 in6_ifa_put(ifp);
832 }
833
834 #ifdef CONFIG_IPV6_PRIVACY
835 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
836 {
837 struct inet6_dev *idev = ifp->idev;
838 struct in6_addr addr, *tmpaddr;
839 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
840 unsigned long regen_advance;
841 int tmp_plen;
842 int ret = 0;
843 int max_addresses;
844 u32 addr_flags;
845
846 write_lock(&idev->lock);
847 if (ift) {
848 spin_lock_bh(&ift->lock);
849 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
850 spin_unlock_bh(&ift->lock);
851 tmpaddr = &addr;
852 } else {
853 tmpaddr = NULL;
854 }
855 retry:
856 in6_dev_hold(idev);
857 if (idev->cnf.use_tempaddr <= 0) {
858 write_unlock(&idev->lock);
859 printk(KERN_INFO
860 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
861 in6_dev_put(idev);
862 ret = -1;
863 goto out;
864 }
865 spin_lock_bh(&ifp->lock);
866 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
867 idev->cnf.use_tempaddr = -1; /*XXX*/
868 spin_unlock_bh(&ifp->lock);
869 write_unlock(&idev->lock);
870 printk(KERN_WARNING
871 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
872 in6_dev_put(idev);
873 ret = -1;
874 goto out;
875 }
876 in6_ifa_hold(ifp);
877 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
878 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
879 spin_unlock_bh(&ifp->lock);
880 write_unlock(&idev->lock);
881 printk(KERN_WARNING
882 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
883 in6_ifa_put(ifp);
884 in6_dev_put(idev);
885 ret = -1;
886 goto out;
887 }
888 memcpy(&addr.s6_addr[8], idev->rndid, 8);
889 tmp_valid_lft = min_t(__u32,
890 ifp->valid_lft,
891 idev->cnf.temp_valid_lft);
892 tmp_prefered_lft = min_t(__u32,
893 ifp->prefered_lft,
894 idev->cnf.temp_prefered_lft -
895 idev->cnf.max_desync_factor);
896 tmp_plen = ifp->prefix_len;
897 max_addresses = idev->cnf.max_addresses;
898 tmp_cstamp = ifp->cstamp;
899 tmp_tstamp = ifp->tstamp;
900 spin_unlock_bh(&ifp->lock);
901
902 regen_advance = idev->cnf.regen_max_retry *
903 idev->cnf.dad_transmits *
904 idev->nd_parms->retrans_time / HZ;
905 write_unlock(&idev->lock);
906
907 /* A temporary address is created only if this calculated Preferred
908 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
909 * an implementation must not create a temporary address with a zero
910 * Preferred Lifetime.
911 */
912 if (tmp_prefered_lft <= regen_advance) {
913 in6_ifa_put(ifp);
914 in6_dev_put(idev);
915 ret = -1;
916 goto out;
917 }
918
919 addr_flags = IFA_F_TEMPORARY;
920 /* set in addrconf_prefix_rcv() */
921 if (ifp->flags & IFA_F_OPTIMISTIC)
922 addr_flags |= IFA_F_OPTIMISTIC;
923
924 ift = !max_addresses ||
925 ipv6_count_addresses(idev) < max_addresses ?
926 ipv6_add_addr(idev, &addr, tmp_plen,
927 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
928 addr_flags) : NULL;
929 if (!ift || IS_ERR(ift)) {
930 in6_ifa_put(ifp);
931 in6_dev_put(idev);
932 printk(KERN_INFO
933 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
934 tmpaddr = &addr;
935 write_lock(&idev->lock);
936 goto retry;
937 }
938
939 spin_lock_bh(&ift->lock);
940 ift->ifpub = ifp;
941 ift->valid_lft = tmp_valid_lft;
942 ift->prefered_lft = tmp_prefered_lft;
943 ift->cstamp = tmp_cstamp;
944 ift->tstamp = tmp_tstamp;
945 spin_unlock_bh(&ift->lock);
946
947 addrconf_dad_start(ift, 0);
948 in6_ifa_put(ift);
949 in6_dev_put(idev);
950 out:
951 return ret;
952 }
953 #endif
954
955 /*
956 * Choose an appropriate source address (RFC3484)
957 */
958 enum {
959 IPV6_SADDR_RULE_INIT = 0,
960 IPV6_SADDR_RULE_LOCAL,
961 IPV6_SADDR_RULE_SCOPE,
962 IPV6_SADDR_RULE_PREFERRED,
963 #ifdef CONFIG_IPV6_MIP6
964 IPV6_SADDR_RULE_HOA,
965 #endif
966 IPV6_SADDR_RULE_OIF,
967 IPV6_SADDR_RULE_LABEL,
968 #ifdef CONFIG_IPV6_PRIVACY
969 IPV6_SADDR_RULE_PRIVACY,
970 #endif
971 IPV6_SADDR_RULE_ORCHID,
972 IPV6_SADDR_RULE_PREFIX,
973 IPV6_SADDR_RULE_MAX
974 };
975
976 struct ipv6_saddr_score {
977 int rule;
978 int addr_type;
979 struct inet6_ifaddr *ifa;
980 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
981 int scopedist;
982 int matchlen;
983 };
984
985 struct ipv6_saddr_dst {
986 const struct in6_addr *addr;
987 int ifindex;
988 int scope;
989 int label;
990 unsigned int prefs;
991 };
992
993 static inline int ipv6_saddr_preferred(int type)
994 {
995 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
996 return 1;
997 return 0;
998 }
999
1000 static int ipv6_get_saddr_eval(struct net *net,
1001 struct ipv6_saddr_score *score,
1002 struct ipv6_saddr_dst *dst,
1003 int i)
1004 {
1005 int ret;
1006
1007 if (i <= score->rule) {
1008 switch (i) {
1009 case IPV6_SADDR_RULE_SCOPE:
1010 ret = score->scopedist;
1011 break;
1012 case IPV6_SADDR_RULE_PREFIX:
1013 ret = score->matchlen;
1014 break;
1015 default:
1016 ret = !!test_bit(i, score->scorebits);
1017 }
1018 goto out;
1019 }
1020
1021 switch (i) {
1022 case IPV6_SADDR_RULE_INIT:
1023 /* Rule 0: remember if hiscore is not ready yet */
1024 ret = !!score->ifa;
1025 break;
1026 case IPV6_SADDR_RULE_LOCAL:
1027 /* Rule 1: Prefer same address */
1028 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1029 break;
1030 case IPV6_SADDR_RULE_SCOPE:
1031 /* Rule 2: Prefer appropriate scope
1032 *
1033 * ret
1034 * ^
1035 * -1 | d 15
1036 * ---+--+-+---> scope
1037 * |
1038 * | d is scope of the destination.
1039 * B-d | \
1040 * | \ <- smaller scope is better if
1041 * B-15 | \ if scope is enough for destinaion.
1042 * | ret = B - scope (-1 <= scope >= d <= 15).
1043 * d-C-1 | /
1044 * |/ <- greater is better
1045 * -C / if scope is not enough for destination.
1046 * /| ret = scope - C (-1 <= d < scope <= 15).
1047 *
1048 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1049 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1050 * Assume B = 0 and we get C > 29.
1051 */
1052 ret = __ipv6_addr_src_scope(score->addr_type);
1053 if (ret >= dst->scope)
1054 ret = -ret;
1055 else
1056 ret -= 128; /* 30 is enough */
1057 score->scopedist = ret;
1058 break;
1059 case IPV6_SADDR_RULE_PREFERRED:
1060 /* Rule 3: Avoid deprecated and optimistic addresses */
1061 ret = ipv6_saddr_preferred(score->addr_type) ||
1062 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1063 break;
1064 #ifdef CONFIG_IPV6_MIP6
1065 case IPV6_SADDR_RULE_HOA:
1066 {
1067 /* Rule 4: Prefer home address */
1068 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1069 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1070 break;
1071 }
1072 #endif
1073 case IPV6_SADDR_RULE_OIF:
1074 /* Rule 5: Prefer outgoing interface */
1075 ret = (!dst->ifindex ||
1076 dst->ifindex == score->ifa->idev->dev->ifindex);
1077 break;
1078 case IPV6_SADDR_RULE_LABEL:
1079 /* Rule 6: Prefer matching label */
1080 ret = ipv6_addr_label(net,
1081 &score->ifa->addr, score->addr_type,
1082 score->ifa->idev->dev->ifindex) == dst->label;
1083 break;
1084 #ifdef CONFIG_IPV6_PRIVACY
1085 case IPV6_SADDR_RULE_PRIVACY:
1086 {
1087 /* Rule 7: Prefer public address
1088 * Note: prefer temprary address if use_tempaddr >= 2
1089 */
1090 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1091 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1092 score->ifa->idev->cnf.use_tempaddr >= 2;
1093 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1094 break;
1095 }
1096 #endif
1097 case IPV6_SADDR_RULE_ORCHID:
1098 /* Rule 8-: Prefer ORCHID vs ORCHID or
1099 * non-ORCHID vs non-ORCHID
1100 */
1101 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1102 ipv6_addr_orchid(dst->addr));
1103 break;
1104 case IPV6_SADDR_RULE_PREFIX:
1105 /* Rule 8: Use longest matching prefix */
1106 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr,
1107 dst->addr);
1108 break;
1109 default:
1110 ret = 0;
1111 }
1112
1113 if (ret)
1114 __set_bit(i, score->scorebits);
1115 score->rule = i;
1116 out:
1117 return ret;
1118 }
1119
1120 int ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev,
1121 const struct in6_addr *daddr, unsigned int prefs,
1122 struct in6_addr *saddr)
1123 {
1124 struct ipv6_saddr_score scores[2],
1125 *score = &scores[0], *hiscore = &scores[1];
1126 struct ipv6_saddr_dst dst;
1127 struct net_device *dev;
1128 int dst_type;
1129
1130 dst_type = __ipv6_addr_type(daddr);
1131 dst.addr = daddr;
1132 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1133 dst.scope = __ipv6_addr_src_scope(dst_type);
1134 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1135 dst.prefs = prefs;
1136
1137 hiscore->rule = -1;
1138 hiscore->ifa = NULL;
1139
1140 rcu_read_lock();
1141
1142 for_each_netdev_rcu(net, dev) {
1143 struct inet6_dev *idev;
1144
1145 /* Candidate Source Address (section 4)
1146 * - multicast and link-local destination address,
1147 * the set of candidate source address MUST only
1148 * include addresses assigned to interfaces
1149 * belonging to the same link as the outgoing
1150 * interface.
1151 * (- For site-local destination addresses, the
1152 * set of candidate source addresses MUST only
1153 * include addresses assigned to interfaces
1154 * belonging to the same site as the outgoing
1155 * interface.)
1156 */
1157 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1158 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1159 dst.ifindex && dev->ifindex != dst.ifindex)
1160 continue;
1161
1162 idev = __in6_dev_get(dev);
1163 if (!idev)
1164 continue;
1165
1166 read_lock_bh(&idev->lock);
1167 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1168 int i;
1169
1170 /*
1171 * - Tentative Address (RFC2462 section 5.4)
1172 * - A tentative address is not considered
1173 * "assigned to an interface" in the traditional
1174 * sense, unless it is also flagged as optimistic.
1175 * - Candidate Source Address (section 4)
1176 * - In any case, anycast addresses, multicast
1177 * addresses, and the unspecified address MUST
1178 * NOT be included in a candidate set.
1179 */
1180 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1181 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1182 continue;
1183
1184 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1185
1186 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1187 score->addr_type & IPV6_ADDR_MULTICAST)) {
1188 LIMIT_NETDEBUG(KERN_DEBUG
1189 "ADDRCONF: unspecified / multicast address "
1190 "assigned as unicast address on %s",
1191 dev->name);
1192 continue;
1193 }
1194
1195 score->rule = -1;
1196 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1197
1198 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1199 int minihiscore, miniscore;
1200
1201 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1202 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1203
1204 if (minihiscore > miniscore) {
1205 if (i == IPV6_SADDR_RULE_SCOPE &&
1206 score->scopedist > 0) {
1207 /*
1208 * special case:
1209 * each remaining entry
1210 * has too small (not enough)
1211 * scope, because ifa entries
1212 * are sorted by their scope
1213 * values.
1214 */
1215 goto try_nextdev;
1216 }
1217 break;
1218 } else if (minihiscore < miniscore) {
1219 if (hiscore->ifa)
1220 in6_ifa_put(hiscore->ifa);
1221
1222 in6_ifa_hold(score->ifa);
1223
1224 swap(hiscore, score);
1225
1226 /* restore our iterator */
1227 score->ifa = hiscore->ifa;
1228
1229 break;
1230 }
1231 }
1232 }
1233 try_nextdev:
1234 read_unlock_bh(&idev->lock);
1235 }
1236 rcu_read_unlock();
1237
1238 if (!hiscore->ifa)
1239 return -EADDRNOTAVAIL;
1240
1241 ipv6_addr_copy(saddr, &hiscore->ifa->addr);
1242 in6_ifa_put(hiscore->ifa);
1243 return 0;
1244 }
1245 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1246
1247 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1248 unsigned char banned_flags)
1249 {
1250 struct inet6_dev *idev;
1251 int err = -EADDRNOTAVAIL;
1252
1253 rcu_read_lock();
1254 idev = __in6_dev_get(dev);
1255 if (idev) {
1256 struct inet6_ifaddr *ifp;
1257
1258 read_lock_bh(&idev->lock);
1259 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1260 if (ifp->scope == IFA_LINK &&
1261 !(ifp->flags & banned_flags)) {
1262 ipv6_addr_copy(addr, &ifp->addr);
1263 err = 0;
1264 break;
1265 }
1266 }
1267 read_unlock_bh(&idev->lock);
1268 }
1269 rcu_read_unlock();
1270 return err;
1271 }
1272
1273 static int ipv6_count_addresses(struct inet6_dev *idev)
1274 {
1275 int cnt = 0;
1276 struct inet6_ifaddr *ifp;
1277
1278 read_lock_bh(&idev->lock);
1279 list_for_each_entry(ifp, &idev->addr_list, if_list)
1280 cnt++;
1281 read_unlock_bh(&idev->lock);
1282 return cnt;
1283 }
1284
1285 int ipv6_chk_addr(struct net *net, struct in6_addr *addr,
1286 struct net_device *dev, int strict)
1287 {
1288 struct inet6_ifaddr *ifp;
1289 struct hlist_node *node;
1290 unsigned int hash = ipv6_addr_hash(addr);
1291
1292 rcu_read_lock_bh();
1293 hlist_for_each_entry_rcu(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1294 if (!net_eq(dev_net(ifp->idev->dev), net))
1295 continue;
1296 if (ipv6_addr_equal(&ifp->addr, addr) &&
1297 !(ifp->flags&IFA_F_TENTATIVE) &&
1298 (dev == NULL || ifp->idev->dev == dev ||
1299 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1300 rcu_read_unlock_bh();
1301 return 1;
1302 }
1303 }
1304
1305 rcu_read_unlock_bh();
1306 return 0;
1307 }
1308 EXPORT_SYMBOL(ipv6_chk_addr);
1309
1310 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1311 struct net_device *dev)
1312 {
1313 unsigned int hash = ipv6_addr_hash(addr);
1314 struct inet6_ifaddr *ifp;
1315 struct hlist_node *node;
1316
1317 hlist_for_each_entry(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1318 if (!net_eq(dev_net(ifp->idev->dev), net))
1319 continue;
1320 if (ipv6_addr_equal(&ifp->addr, addr)) {
1321 if (dev == NULL || ifp->idev->dev == dev)
1322 return true;
1323 }
1324 }
1325 return false;
1326 }
1327
1328 int ipv6_chk_prefix(struct in6_addr *addr, struct net_device *dev)
1329 {
1330 struct inet6_dev *idev;
1331 struct inet6_ifaddr *ifa;
1332 int onlink;
1333
1334 onlink = 0;
1335 rcu_read_lock();
1336 idev = __in6_dev_get(dev);
1337 if (idev) {
1338 read_lock_bh(&idev->lock);
1339 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1340 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1341 ifa->prefix_len);
1342 if (onlink)
1343 break;
1344 }
1345 read_unlock_bh(&idev->lock);
1346 }
1347 rcu_read_unlock();
1348 return onlink;
1349 }
1350
1351 EXPORT_SYMBOL(ipv6_chk_prefix);
1352
1353 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1354 struct net_device *dev, int strict)
1355 {
1356 struct inet6_ifaddr *ifp, *result = NULL;
1357 unsigned int hash = ipv6_addr_hash(addr);
1358 struct hlist_node *node;
1359
1360 rcu_read_lock_bh();
1361 hlist_for_each_entry_rcu_bh(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1362 if (!net_eq(dev_net(ifp->idev->dev), net))
1363 continue;
1364 if (ipv6_addr_equal(&ifp->addr, addr)) {
1365 if (dev == NULL || ifp->idev->dev == dev ||
1366 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1367 result = ifp;
1368 in6_ifa_hold(ifp);
1369 break;
1370 }
1371 }
1372 }
1373 rcu_read_unlock_bh();
1374
1375 return result;
1376 }
1377
1378 /* Gets referenced address, destroys ifaddr */
1379
1380 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1381 {
1382 if (ifp->flags&IFA_F_PERMANENT) {
1383 spin_lock_bh(&ifp->lock);
1384 addrconf_del_timer(ifp);
1385 ifp->flags |= IFA_F_TENTATIVE;
1386 if (dad_failed)
1387 ifp->flags |= IFA_F_DADFAILED;
1388 spin_unlock_bh(&ifp->lock);
1389 if (dad_failed)
1390 ipv6_ifa_notify(0, ifp);
1391 in6_ifa_put(ifp);
1392 #ifdef CONFIG_IPV6_PRIVACY
1393 } else if (ifp->flags&IFA_F_TEMPORARY) {
1394 struct inet6_ifaddr *ifpub;
1395 spin_lock_bh(&ifp->lock);
1396 ifpub = ifp->ifpub;
1397 if (ifpub) {
1398 in6_ifa_hold(ifpub);
1399 spin_unlock_bh(&ifp->lock);
1400 ipv6_create_tempaddr(ifpub, ifp);
1401 in6_ifa_put(ifpub);
1402 } else {
1403 spin_unlock_bh(&ifp->lock);
1404 }
1405 ipv6_del_addr(ifp);
1406 #endif
1407 } else
1408 ipv6_del_addr(ifp);
1409 }
1410
1411 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1412 {
1413 int err = -ENOENT;
1414
1415 spin_lock(&ifp->state_lock);
1416 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1417 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1418 err = 0;
1419 }
1420 spin_unlock(&ifp->state_lock);
1421
1422 return err;
1423 }
1424
1425 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1426 {
1427 struct inet6_dev *idev = ifp->idev;
1428
1429 if (addrconf_dad_end(ifp))
1430 return;
1431
1432 if (net_ratelimit())
1433 printk(KERN_INFO "%s: IPv6 duplicate address %pI6c detected!\n",
1434 ifp->idev->dev->name, &ifp->addr);
1435
1436 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1437 struct in6_addr addr;
1438
1439 addr.s6_addr32[0] = htonl(0xfe800000);
1440 addr.s6_addr32[1] = 0;
1441
1442 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1443 ipv6_addr_equal(&ifp->addr, &addr)) {
1444 /* DAD failed for link-local based on MAC address */
1445 idev->cnf.disable_ipv6 = 1;
1446
1447 printk(KERN_INFO "%s: IPv6 being disabled!\n",
1448 ifp->idev->dev->name);
1449 }
1450 }
1451
1452 addrconf_dad_stop(ifp, 1);
1453 }
1454
1455 /* Join to solicited addr multicast group. */
1456
1457 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1458 {
1459 struct in6_addr maddr;
1460
1461 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1462 return;
1463
1464 addrconf_addr_solict_mult(addr, &maddr);
1465 ipv6_dev_mc_inc(dev, &maddr);
1466 }
1467
1468 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1469 {
1470 struct in6_addr maddr;
1471
1472 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1473 return;
1474
1475 addrconf_addr_solict_mult(addr, &maddr);
1476 __ipv6_dev_mc_dec(idev, &maddr);
1477 }
1478
1479 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1480 {
1481 struct in6_addr addr;
1482 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1483 if (ipv6_addr_any(&addr))
1484 return;
1485 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1486 }
1487
1488 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1489 {
1490 struct in6_addr addr;
1491 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1492 if (ipv6_addr_any(&addr))
1493 return;
1494 __ipv6_dev_ac_dec(ifp->idev, &addr);
1495 }
1496
1497 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1498 {
1499 if (dev->addr_len != ETH_ALEN)
1500 return -1;
1501 memcpy(eui, dev->dev_addr, 3);
1502 memcpy(eui + 5, dev->dev_addr + 3, 3);
1503
1504 /*
1505 * The zSeries OSA network cards can be shared among various
1506 * OS instances, but the OSA cards have only one MAC address.
1507 * This leads to duplicate address conflicts in conjunction
1508 * with IPv6 if more than one instance uses the same card.
1509 *
1510 * The driver for these cards can deliver a unique 16-bit
1511 * identifier for each instance sharing the same card. It is
1512 * placed instead of 0xFFFE in the interface identifier. The
1513 * "u" bit of the interface identifier is not inverted in this
1514 * case. Hence the resulting interface identifier has local
1515 * scope according to RFC2373.
1516 */
1517 if (dev->dev_id) {
1518 eui[3] = (dev->dev_id >> 8) & 0xFF;
1519 eui[4] = dev->dev_id & 0xFF;
1520 } else {
1521 eui[3] = 0xFF;
1522 eui[4] = 0xFE;
1523 eui[0] ^= 2;
1524 }
1525 return 0;
1526 }
1527
1528 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1529 {
1530 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1531 if (dev->addr_len != ARCNET_ALEN)
1532 return -1;
1533 memset(eui, 0, 7);
1534 eui[7] = *(u8*)dev->dev_addr;
1535 return 0;
1536 }
1537
1538 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1539 {
1540 if (dev->addr_len != INFINIBAND_ALEN)
1541 return -1;
1542 memcpy(eui, dev->dev_addr + 12, 8);
1543 eui[0] |= 2;
1544 return 0;
1545 }
1546
1547 int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1548 {
1549 if (addr == 0)
1550 return -1;
1551 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1552 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1553 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1554 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1555 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1556 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1557 eui[1] = 0;
1558 eui[2] = 0x5E;
1559 eui[3] = 0xFE;
1560 memcpy(eui + 4, &addr, 4);
1561 return 0;
1562 }
1563 EXPORT_SYMBOL(__ipv6_isatap_ifid);
1564
1565 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1566 {
1567 if (dev->priv_flags & IFF_ISATAP)
1568 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1569 return -1;
1570 }
1571
1572 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1573 {
1574 switch (dev->type) {
1575 case ARPHRD_ETHER:
1576 case ARPHRD_FDDI:
1577 case ARPHRD_IEEE802_TR:
1578 return addrconf_ifid_eui48(eui, dev);
1579 case ARPHRD_ARCNET:
1580 return addrconf_ifid_arcnet(eui, dev);
1581 case ARPHRD_INFINIBAND:
1582 return addrconf_ifid_infiniband(eui, dev);
1583 case ARPHRD_SIT:
1584 return addrconf_ifid_sit(eui, dev);
1585 }
1586 return -1;
1587 }
1588
1589 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1590 {
1591 int err = -1;
1592 struct inet6_ifaddr *ifp;
1593
1594 read_lock_bh(&idev->lock);
1595 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1596 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1597 memcpy(eui, ifp->addr.s6_addr+8, 8);
1598 err = 0;
1599 break;
1600 }
1601 }
1602 read_unlock_bh(&idev->lock);
1603 return err;
1604 }
1605
1606 #ifdef CONFIG_IPV6_PRIVACY
1607 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1608 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1609 {
1610 regen:
1611 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1612 idev->rndid[0] &= ~0x02;
1613
1614 /*
1615 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1616 * check if generated address is not inappropriate
1617 *
1618 * - Reserved subnet anycast (RFC 2526)
1619 * 11111101 11....11 1xxxxxxx
1620 * - ISATAP (RFC4214) 6.1
1621 * 00-00-5E-FE-xx-xx-xx-xx
1622 * - value 0
1623 * - XXX: already assigned to an address on the device
1624 */
1625 if (idev->rndid[0] == 0xfd &&
1626 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1627 (idev->rndid[7]&0x80))
1628 goto regen;
1629 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1630 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1631 goto regen;
1632 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1633 goto regen;
1634 }
1635
1636 return 0;
1637 }
1638
1639 static void ipv6_regen_rndid(unsigned long data)
1640 {
1641 struct inet6_dev *idev = (struct inet6_dev *) data;
1642 unsigned long expires;
1643
1644 rcu_read_lock_bh();
1645 write_lock_bh(&idev->lock);
1646
1647 if (idev->dead)
1648 goto out;
1649
1650 if (__ipv6_regen_rndid(idev) < 0)
1651 goto out;
1652
1653 expires = jiffies +
1654 idev->cnf.temp_prefered_lft * HZ -
1655 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time -
1656 idev->cnf.max_desync_factor * HZ;
1657 if (time_before(expires, jiffies)) {
1658 printk(KERN_WARNING
1659 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1660 idev->dev->name);
1661 goto out;
1662 }
1663
1664 if (!mod_timer(&idev->regen_timer, expires))
1665 in6_dev_hold(idev);
1666
1667 out:
1668 write_unlock_bh(&idev->lock);
1669 rcu_read_unlock_bh();
1670 in6_dev_put(idev);
1671 }
1672
1673 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1674 int ret = 0;
1675
1676 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1677 ret = __ipv6_regen_rndid(idev);
1678 return ret;
1679 }
1680 #endif
1681
1682 /*
1683 * Add prefix route.
1684 */
1685
1686 static void
1687 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1688 unsigned long expires, u32 flags)
1689 {
1690 struct fib6_config cfg = {
1691 .fc_table = RT6_TABLE_PREFIX,
1692 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1693 .fc_ifindex = dev->ifindex,
1694 .fc_expires = expires,
1695 .fc_dst_len = plen,
1696 .fc_flags = RTF_UP | flags,
1697 .fc_nlinfo.nl_net = dev_net(dev),
1698 .fc_protocol = RTPROT_KERNEL,
1699 };
1700
1701 ipv6_addr_copy(&cfg.fc_dst, pfx);
1702
1703 /* Prevent useless cloning on PtP SIT.
1704 This thing is done here expecting that the whole
1705 class of non-broadcast devices need not cloning.
1706 */
1707 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1708 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1709 cfg.fc_flags |= RTF_NONEXTHOP;
1710 #endif
1711
1712 ip6_route_add(&cfg);
1713 }
1714
1715 /* Create "default" multicast route to the interface */
1716
1717 static void addrconf_add_mroute(struct net_device *dev)
1718 {
1719 struct fib6_config cfg = {
1720 .fc_table = RT6_TABLE_LOCAL,
1721 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1722 .fc_ifindex = dev->ifindex,
1723 .fc_dst_len = 8,
1724 .fc_flags = RTF_UP,
1725 .fc_nlinfo.nl_net = dev_net(dev),
1726 };
1727
1728 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1729
1730 ip6_route_add(&cfg);
1731 }
1732
1733 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1734 static void sit_route_add(struct net_device *dev)
1735 {
1736 struct fib6_config cfg = {
1737 .fc_table = RT6_TABLE_MAIN,
1738 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1739 .fc_ifindex = dev->ifindex,
1740 .fc_dst_len = 96,
1741 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1742 .fc_nlinfo.nl_net = dev_net(dev),
1743 };
1744
1745 /* prefix length - 96 bits "::d.d.d.d" */
1746 ip6_route_add(&cfg);
1747 }
1748 #endif
1749
1750 static void addrconf_add_lroute(struct net_device *dev)
1751 {
1752 struct in6_addr addr;
1753
1754 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1755 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1756 }
1757
1758 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1759 {
1760 struct inet6_dev *idev;
1761
1762 ASSERT_RTNL();
1763
1764 idev = ipv6_find_idev(dev);
1765 if (!idev)
1766 return ERR_PTR(-ENOBUFS);
1767
1768 if (idev->cnf.disable_ipv6)
1769 return ERR_PTR(-EACCES);
1770
1771 /* Add default multicast route */
1772 addrconf_add_mroute(dev);
1773
1774 /* Add link local route */
1775 addrconf_add_lroute(dev);
1776 return idev;
1777 }
1778
1779 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1780 {
1781 struct prefix_info *pinfo;
1782 __u32 valid_lft;
1783 __u32 prefered_lft;
1784 int addr_type;
1785 struct inet6_dev *in6_dev;
1786 struct net *net = dev_net(dev);
1787
1788 pinfo = (struct prefix_info *) opt;
1789
1790 if (len < sizeof(struct prefix_info)) {
1791 ADBG(("addrconf: prefix option too short\n"));
1792 return;
1793 }
1794
1795 /*
1796 * Validation checks ([ADDRCONF], page 19)
1797 */
1798
1799 addr_type = ipv6_addr_type(&pinfo->prefix);
1800
1801 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1802 return;
1803
1804 valid_lft = ntohl(pinfo->valid);
1805 prefered_lft = ntohl(pinfo->prefered);
1806
1807 if (prefered_lft > valid_lft) {
1808 if (net_ratelimit())
1809 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1810 return;
1811 }
1812
1813 in6_dev = in6_dev_get(dev);
1814
1815 if (in6_dev == NULL) {
1816 if (net_ratelimit())
1817 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1818 return;
1819 }
1820
1821 /*
1822 * Two things going on here:
1823 * 1) Add routes for on-link prefixes
1824 * 2) Configure prefixes with the auto flag set
1825 */
1826
1827 if (pinfo->onlink) {
1828 struct rt6_info *rt;
1829 unsigned long rt_expires;
1830
1831 /* Avoid arithmetic overflow. Really, we could
1832 * save rt_expires in seconds, likely valid_lft,
1833 * but it would require division in fib gc, that it
1834 * not good.
1835 */
1836 if (HZ > USER_HZ)
1837 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
1838 else
1839 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
1840
1841 if (addrconf_finite_timeout(rt_expires))
1842 rt_expires *= HZ;
1843
1844 rt = rt6_lookup(net, &pinfo->prefix, NULL,
1845 dev->ifindex, 1);
1846
1847 if (rt && addrconf_is_prefix_route(rt)) {
1848 /* Autoconf prefix route */
1849 if (valid_lft == 0) {
1850 ip6_del_rt(rt);
1851 rt = NULL;
1852 } else if (addrconf_finite_timeout(rt_expires)) {
1853 /* not infinity */
1854 rt->rt6i_expires = jiffies + rt_expires;
1855 rt->rt6i_flags |= RTF_EXPIRES;
1856 } else {
1857 rt->rt6i_flags &= ~RTF_EXPIRES;
1858 rt->rt6i_expires = 0;
1859 }
1860 } else if (valid_lft) {
1861 clock_t expires = 0;
1862 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
1863 if (addrconf_finite_timeout(rt_expires)) {
1864 /* not infinity */
1865 flags |= RTF_EXPIRES;
1866 expires = jiffies_to_clock_t(rt_expires);
1867 }
1868 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1869 dev, expires, flags);
1870 }
1871 if (rt)
1872 dst_release(&rt->dst);
1873 }
1874
1875 /* Try to figure out our local address for this prefix */
1876
1877 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1878 struct inet6_ifaddr * ifp;
1879 struct in6_addr addr;
1880 int create = 0, update_lft = 0;
1881
1882 if (pinfo->prefix_len == 64) {
1883 memcpy(&addr, &pinfo->prefix, 8);
1884 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1885 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1886 in6_dev_put(in6_dev);
1887 return;
1888 }
1889 goto ok;
1890 }
1891 if (net_ratelimit())
1892 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1893 pinfo->prefix_len);
1894 in6_dev_put(in6_dev);
1895 return;
1896
1897 ok:
1898
1899 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1900
1901 if (ifp == NULL && valid_lft) {
1902 int max_addresses = in6_dev->cnf.max_addresses;
1903 u32 addr_flags = 0;
1904
1905 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1906 if (in6_dev->cnf.optimistic_dad &&
1907 !net->ipv6.devconf_all->forwarding)
1908 addr_flags = IFA_F_OPTIMISTIC;
1909 #endif
1910
1911 /* Do not allow to create too much of autoconfigured
1912 * addresses; this would be too easy way to crash kernel.
1913 */
1914 if (!max_addresses ||
1915 ipv6_count_addresses(in6_dev) < max_addresses)
1916 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1917 addr_type&IPV6_ADDR_SCOPE_MASK,
1918 addr_flags);
1919
1920 if (!ifp || IS_ERR(ifp)) {
1921 in6_dev_put(in6_dev);
1922 return;
1923 }
1924
1925 update_lft = create = 1;
1926 ifp->cstamp = jiffies;
1927 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1928 }
1929
1930 if (ifp) {
1931 int flags;
1932 unsigned long now;
1933 #ifdef CONFIG_IPV6_PRIVACY
1934 struct inet6_ifaddr *ift;
1935 #endif
1936 u32 stored_lft;
1937
1938 /* update lifetime (RFC2462 5.5.3 e) */
1939 spin_lock(&ifp->lock);
1940 now = jiffies;
1941 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1942 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1943 else
1944 stored_lft = 0;
1945 if (!update_lft && stored_lft) {
1946 if (valid_lft > MIN_VALID_LIFETIME ||
1947 valid_lft > stored_lft)
1948 update_lft = 1;
1949 else if (stored_lft <= MIN_VALID_LIFETIME) {
1950 /* valid_lft <= stored_lft is always true */
1951 /*
1952 * RFC 4862 Section 5.5.3e:
1953 * "Note that the preferred lifetime of
1954 * the corresponding address is always
1955 * reset to the Preferred Lifetime in
1956 * the received Prefix Information
1957 * option, regardless of whether the
1958 * valid lifetime is also reset or
1959 * ignored."
1960 *
1961 * So if the preferred lifetime in
1962 * this advertisement is different
1963 * than what we have stored, but the
1964 * valid lifetime is invalid, just
1965 * reset prefered_lft.
1966 *
1967 * We must set the valid lifetime
1968 * to the stored lifetime since we'll
1969 * be updating the timestamp below,
1970 * else we'll set it back to the
1971 * minumum.
1972 */
1973 if (prefered_lft != ifp->prefered_lft) {
1974 valid_lft = stored_lft;
1975 update_lft = 1;
1976 }
1977 } else {
1978 valid_lft = MIN_VALID_LIFETIME;
1979 if (valid_lft < prefered_lft)
1980 prefered_lft = valid_lft;
1981 update_lft = 1;
1982 }
1983 }
1984
1985 if (update_lft) {
1986 ifp->valid_lft = valid_lft;
1987 ifp->prefered_lft = prefered_lft;
1988 ifp->tstamp = now;
1989 flags = ifp->flags;
1990 ifp->flags &= ~IFA_F_DEPRECATED;
1991 spin_unlock(&ifp->lock);
1992
1993 if (!(flags&IFA_F_TENTATIVE))
1994 ipv6_ifa_notify(0, ifp);
1995 } else
1996 spin_unlock(&ifp->lock);
1997
1998 #ifdef CONFIG_IPV6_PRIVACY
1999 read_lock_bh(&in6_dev->lock);
2000 /* update all temporary addresses in the list */
2001 list_for_each_entry(ift, &in6_dev->tempaddr_list, tmp_list) {
2002 /*
2003 * When adjusting the lifetimes of an existing
2004 * temporary address, only lower the lifetimes.
2005 * Implementations must not increase the
2006 * lifetimes of an existing temporary address
2007 * when processing a Prefix Information Option.
2008 */
2009 if (ifp != ift->ifpub)
2010 continue;
2011
2012 spin_lock(&ift->lock);
2013 flags = ift->flags;
2014 if (ift->valid_lft > valid_lft &&
2015 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
2016 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
2017 if (ift->prefered_lft > prefered_lft &&
2018 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
2019 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
2020 spin_unlock(&ift->lock);
2021 if (!(flags&IFA_F_TENTATIVE))
2022 ipv6_ifa_notify(0, ift);
2023 }
2024
2025 if (create && in6_dev->cnf.use_tempaddr > 0) {
2026 /*
2027 * When a new public address is created as described in [ADDRCONF],
2028 * also create a new temporary address.
2029 */
2030 read_unlock_bh(&in6_dev->lock);
2031 ipv6_create_tempaddr(ifp, NULL);
2032 } else {
2033 read_unlock_bh(&in6_dev->lock);
2034 }
2035 #endif
2036 in6_ifa_put(ifp);
2037 addrconf_verify(0);
2038 }
2039 }
2040 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2041 in6_dev_put(in6_dev);
2042 }
2043
2044 /*
2045 * Set destination address.
2046 * Special case for SIT interfaces where we create a new "virtual"
2047 * device.
2048 */
2049 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2050 {
2051 struct in6_ifreq ireq;
2052 struct net_device *dev;
2053 int err = -EINVAL;
2054
2055 rtnl_lock();
2056
2057 err = -EFAULT;
2058 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2059 goto err_exit;
2060
2061 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2062
2063 err = -ENODEV;
2064 if (dev == NULL)
2065 goto err_exit;
2066
2067 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2068 if (dev->type == ARPHRD_SIT) {
2069 const struct net_device_ops *ops = dev->netdev_ops;
2070 struct ifreq ifr;
2071 struct ip_tunnel_parm p;
2072
2073 err = -EADDRNOTAVAIL;
2074 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2075 goto err_exit;
2076
2077 memset(&p, 0, sizeof(p));
2078 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2079 p.iph.saddr = 0;
2080 p.iph.version = 4;
2081 p.iph.ihl = 5;
2082 p.iph.protocol = IPPROTO_IPV6;
2083 p.iph.ttl = 64;
2084 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2085
2086 if (ops->ndo_do_ioctl) {
2087 mm_segment_t oldfs = get_fs();
2088
2089 set_fs(KERNEL_DS);
2090 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2091 set_fs(oldfs);
2092 } else
2093 err = -EOPNOTSUPP;
2094
2095 if (err == 0) {
2096 err = -ENOBUFS;
2097 dev = __dev_get_by_name(net, p.name);
2098 if (!dev)
2099 goto err_exit;
2100 err = dev_open(dev);
2101 }
2102 }
2103 #endif
2104
2105 err_exit:
2106 rtnl_unlock();
2107 return err;
2108 }
2109
2110 /*
2111 * Manual configuration of address on an interface
2112 */
2113 static int inet6_addr_add(struct net *net, int ifindex, struct in6_addr *pfx,
2114 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
2115 __u32 valid_lft)
2116 {
2117 struct inet6_ifaddr *ifp;
2118 struct inet6_dev *idev;
2119 struct net_device *dev;
2120 int scope;
2121 u32 flags;
2122 clock_t expires;
2123 unsigned long timeout;
2124
2125 ASSERT_RTNL();
2126
2127 if (plen > 128)
2128 return -EINVAL;
2129
2130 /* check the lifetime */
2131 if (!valid_lft || prefered_lft > valid_lft)
2132 return -EINVAL;
2133
2134 dev = __dev_get_by_index(net, ifindex);
2135 if (!dev)
2136 return -ENODEV;
2137
2138 idev = addrconf_add_dev(dev);
2139 if (IS_ERR(idev))
2140 return PTR_ERR(idev);
2141
2142 scope = ipv6_addr_scope(pfx);
2143
2144 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2145 if (addrconf_finite_timeout(timeout)) {
2146 expires = jiffies_to_clock_t(timeout * HZ);
2147 valid_lft = timeout;
2148 flags = RTF_EXPIRES;
2149 } else {
2150 expires = 0;
2151 flags = 0;
2152 ifa_flags |= IFA_F_PERMANENT;
2153 }
2154
2155 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2156 if (addrconf_finite_timeout(timeout)) {
2157 if (timeout == 0)
2158 ifa_flags |= IFA_F_DEPRECATED;
2159 prefered_lft = timeout;
2160 }
2161
2162 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2163
2164 if (!IS_ERR(ifp)) {
2165 spin_lock_bh(&ifp->lock);
2166 ifp->valid_lft = valid_lft;
2167 ifp->prefered_lft = prefered_lft;
2168 ifp->tstamp = jiffies;
2169 spin_unlock_bh(&ifp->lock);
2170
2171 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2172 expires, flags);
2173 /*
2174 * Note that section 3.1 of RFC 4429 indicates
2175 * that the Optimistic flag should not be set for
2176 * manually configured addresses
2177 */
2178 addrconf_dad_start(ifp, 0);
2179 in6_ifa_put(ifp);
2180 addrconf_verify(0);
2181 return 0;
2182 }
2183
2184 return PTR_ERR(ifp);
2185 }
2186
2187 static int inet6_addr_del(struct net *net, int ifindex, struct in6_addr *pfx,
2188 unsigned int plen)
2189 {
2190 struct inet6_ifaddr *ifp;
2191 struct inet6_dev *idev;
2192 struct net_device *dev;
2193
2194 if (plen > 128)
2195 return -EINVAL;
2196
2197 dev = __dev_get_by_index(net, ifindex);
2198 if (!dev)
2199 return -ENODEV;
2200
2201 if ((idev = __in6_dev_get(dev)) == NULL)
2202 return -ENXIO;
2203
2204 read_lock_bh(&idev->lock);
2205 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2206 if (ifp->prefix_len == plen &&
2207 ipv6_addr_equal(pfx, &ifp->addr)) {
2208 in6_ifa_hold(ifp);
2209 read_unlock_bh(&idev->lock);
2210
2211 ipv6_del_addr(ifp);
2212
2213 /* If the last address is deleted administratively,
2214 disable IPv6 on this interface.
2215 */
2216 if (list_empty(&idev->addr_list))
2217 addrconf_ifdown(idev->dev, 1);
2218 return 0;
2219 }
2220 }
2221 read_unlock_bh(&idev->lock);
2222 return -EADDRNOTAVAIL;
2223 }
2224
2225
2226 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2227 {
2228 struct in6_ifreq ireq;
2229 int err;
2230
2231 if (!capable(CAP_NET_ADMIN))
2232 return -EPERM;
2233
2234 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2235 return -EFAULT;
2236
2237 rtnl_lock();
2238 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2239 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2240 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2241 rtnl_unlock();
2242 return err;
2243 }
2244
2245 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2246 {
2247 struct in6_ifreq ireq;
2248 int err;
2249
2250 if (!capable(CAP_NET_ADMIN))
2251 return -EPERM;
2252
2253 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2254 return -EFAULT;
2255
2256 rtnl_lock();
2257 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2258 ireq.ifr6_prefixlen);
2259 rtnl_unlock();
2260 return err;
2261 }
2262
2263 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2264 int plen, int scope)
2265 {
2266 struct inet6_ifaddr *ifp;
2267
2268 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT);
2269 if (!IS_ERR(ifp)) {
2270 spin_lock_bh(&ifp->lock);
2271 ifp->flags &= ~IFA_F_TENTATIVE;
2272 spin_unlock_bh(&ifp->lock);
2273 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2274 in6_ifa_put(ifp);
2275 }
2276 }
2277
2278 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2279 static void sit_add_v4_addrs(struct inet6_dev *idev)
2280 {
2281 struct in6_addr addr;
2282 struct net_device *dev;
2283 struct net *net = dev_net(idev->dev);
2284 int scope;
2285
2286 ASSERT_RTNL();
2287
2288 memset(&addr, 0, sizeof(struct in6_addr));
2289 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2290
2291 if (idev->dev->flags&IFF_POINTOPOINT) {
2292 addr.s6_addr32[0] = htonl(0xfe800000);
2293 scope = IFA_LINK;
2294 } else {
2295 scope = IPV6_ADDR_COMPATv4;
2296 }
2297
2298 if (addr.s6_addr32[3]) {
2299 add_addr(idev, &addr, 128, scope);
2300 return;
2301 }
2302
2303 for_each_netdev(net, dev) {
2304 struct in_device * in_dev = __in_dev_get_rtnl(dev);
2305 if (in_dev && (dev->flags & IFF_UP)) {
2306 struct in_ifaddr * ifa;
2307
2308 int flag = scope;
2309
2310 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2311 int plen;
2312
2313 addr.s6_addr32[3] = ifa->ifa_local;
2314
2315 if (ifa->ifa_scope == RT_SCOPE_LINK)
2316 continue;
2317 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2318 if (idev->dev->flags&IFF_POINTOPOINT)
2319 continue;
2320 flag |= IFA_HOST;
2321 }
2322 if (idev->dev->flags&IFF_POINTOPOINT)
2323 plen = 64;
2324 else
2325 plen = 96;
2326
2327 add_addr(idev, &addr, plen, flag);
2328 }
2329 }
2330 }
2331 }
2332 #endif
2333
2334 static void init_loopback(struct net_device *dev)
2335 {
2336 struct inet6_dev *idev;
2337
2338 /* ::1 */
2339
2340 ASSERT_RTNL();
2341
2342 if ((idev = ipv6_find_idev(dev)) == NULL) {
2343 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2344 return;
2345 }
2346
2347 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2348 }
2349
2350 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2351 {
2352 struct inet6_ifaddr * ifp;
2353 u32 addr_flags = IFA_F_PERMANENT;
2354
2355 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2356 if (idev->cnf.optimistic_dad &&
2357 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2358 addr_flags |= IFA_F_OPTIMISTIC;
2359 #endif
2360
2361
2362 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2363 if (!IS_ERR(ifp)) {
2364 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2365 addrconf_dad_start(ifp, 0);
2366 in6_ifa_put(ifp);
2367 }
2368 }
2369
2370 static void addrconf_dev_config(struct net_device *dev)
2371 {
2372 struct in6_addr addr;
2373 struct inet6_dev * idev;
2374
2375 ASSERT_RTNL();
2376
2377 if ((dev->type != ARPHRD_ETHER) &&
2378 (dev->type != ARPHRD_FDDI) &&
2379 (dev->type != ARPHRD_IEEE802_TR) &&
2380 (dev->type != ARPHRD_ARCNET) &&
2381 (dev->type != ARPHRD_INFINIBAND)) {
2382 /* Alas, we support only Ethernet autoconfiguration. */
2383 return;
2384 }
2385
2386 idev = addrconf_add_dev(dev);
2387 if (IS_ERR(idev))
2388 return;
2389
2390 memset(&addr, 0, sizeof(struct in6_addr));
2391 addr.s6_addr32[0] = htonl(0xFE800000);
2392
2393 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2394 addrconf_add_linklocal(idev, &addr);
2395 }
2396
2397 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2398 static void addrconf_sit_config(struct net_device *dev)
2399 {
2400 struct inet6_dev *idev;
2401
2402 ASSERT_RTNL();
2403
2404 /*
2405 * Configure the tunnel with one of our IPv4
2406 * addresses... we should configure all of
2407 * our v4 addrs in the tunnel
2408 */
2409
2410 if ((idev = ipv6_find_idev(dev)) == NULL) {
2411 printk(KERN_DEBUG "init sit: add_dev failed\n");
2412 return;
2413 }
2414
2415 if (dev->priv_flags & IFF_ISATAP) {
2416 struct in6_addr addr;
2417
2418 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2419 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2420 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2421 addrconf_add_linklocal(idev, &addr);
2422 return;
2423 }
2424
2425 sit_add_v4_addrs(idev);
2426
2427 if (dev->flags&IFF_POINTOPOINT) {
2428 addrconf_add_mroute(dev);
2429 addrconf_add_lroute(dev);
2430 } else
2431 sit_route_add(dev);
2432 }
2433 #endif
2434
2435 static inline int
2436 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2437 {
2438 struct in6_addr lladdr;
2439
2440 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2441 addrconf_add_linklocal(idev, &lladdr);
2442 return 0;
2443 }
2444 return -1;
2445 }
2446
2447 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2448 {
2449 struct net_device *link_dev;
2450 struct net *net = dev_net(idev->dev);
2451
2452 /* first try to inherit the link-local address from the link device */
2453 if (idev->dev->iflink &&
2454 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
2455 if (!ipv6_inherit_linklocal(idev, link_dev))
2456 return;
2457 }
2458 /* then try to inherit it from any device */
2459 for_each_netdev(net, link_dev) {
2460 if (!ipv6_inherit_linklocal(idev, link_dev))
2461 return;
2462 }
2463 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2464 }
2465
2466 /*
2467 * Autoconfigure tunnel with a link-local address so routing protocols,
2468 * DHCPv6, MLD etc. can be run over the virtual link
2469 */
2470
2471 static void addrconf_ip6_tnl_config(struct net_device *dev)
2472 {
2473 struct inet6_dev *idev;
2474
2475 ASSERT_RTNL();
2476
2477 idev = addrconf_add_dev(dev);
2478 if (IS_ERR(idev)) {
2479 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2480 return;
2481 }
2482 ip6_tnl_add_linklocal(idev);
2483 }
2484
2485 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2486 void * data)
2487 {
2488 struct net_device *dev = (struct net_device *) data;
2489 struct inet6_dev *idev = __in6_dev_get(dev);
2490 int run_pending = 0;
2491 int err;
2492
2493 switch (event) {
2494 case NETDEV_REGISTER:
2495 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2496 idev = ipv6_add_dev(dev);
2497 if (!idev)
2498 return notifier_from_errno(-ENOMEM);
2499 }
2500 break;
2501
2502 case NETDEV_UP:
2503 case NETDEV_CHANGE:
2504 if (dev->flags & IFF_SLAVE)
2505 break;
2506
2507 if (event == NETDEV_UP) {
2508 if (!addrconf_qdisc_ok(dev)) {
2509 /* device is not ready yet. */
2510 printk(KERN_INFO
2511 "ADDRCONF(NETDEV_UP): %s: "
2512 "link is not ready\n",
2513 dev->name);
2514 break;
2515 }
2516
2517 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2518 idev = ipv6_add_dev(dev);
2519
2520 if (idev) {
2521 idev->if_flags |= IF_READY;
2522 run_pending = 1;
2523 }
2524 } else {
2525 if (!addrconf_qdisc_ok(dev)) {
2526 /* device is still not ready. */
2527 break;
2528 }
2529
2530 if (idev) {
2531 if (idev->if_flags & IF_READY)
2532 /* device is already configured. */
2533 break;
2534 idev->if_flags |= IF_READY;
2535 }
2536
2537 printk(KERN_INFO
2538 "ADDRCONF(NETDEV_CHANGE): %s: "
2539 "link becomes ready\n",
2540 dev->name);
2541
2542 run_pending = 1;
2543 }
2544
2545 switch (dev->type) {
2546 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2547 case ARPHRD_SIT:
2548 addrconf_sit_config(dev);
2549 break;
2550 #endif
2551 case ARPHRD_TUNNEL6:
2552 addrconf_ip6_tnl_config(dev);
2553 break;
2554 case ARPHRD_LOOPBACK:
2555 init_loopback(dev);
2556 break;
2557
2558 default:
2559 addrconf_dev_config(dev);
2560 break;
2561 }
2562
2563 if (idev) {
2564 if (run_pending)
2565 addrconf_dad_run(idev);
2566
2567 /*
2568 * If the MTU changed during the interface down,
2569 * when the interface up, the changed MTU must be
2570 * reflected in the idev as well as routers.
2571 */
2572 if (idev->cnf.mtu6 != dev->mtu &&
2573 dev->mtu >= IPV6_MIN_MTU) {
2574 rt6_mtu_change(dev, dev->mtu);
2575 idev->cnf.mtu6 = dev->mtu;
2576 }
2577 idev->tstamp = jiffies;
2578 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2579
2580 /*
2581 * If the changed mtu during down is lower than
2582 * IPV6_MIN_MTU stop IPv6 on this interface.
2583 */
2584 if (dev->mtu < IPV6_MIN_MTU)
2585 addrconf_ifdown(dev, 1);
2586 }
2587 break;
2588
2589 case NETDEV_CHANGEMTU:
2590 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2591 rt6_mtu_change(dev, dev->mtu);
2592 idev->cnf.mtu6 = dev->mtu;
2593 break;
2594 }
2595
2596 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2597 idev = ipv6_add_dev(dev);
2598 if (idev)
2599 break;
2600 }
2601
2602 /*
2603 * MTU falled under IPV6_MIN_MTU.
2604 * Stop IPv6 on this interface.
2605 */
2606
2607 case NETDEV_DOWN:
2608 case NETDEV_UNREGISTER:
2609 /*
2610 * Remove all addresses from this interface.
2611 */
2612 addrconf_ifdown(dev, event != NETDEV_DOWN);
2613 break;
2614
2615 case NETDEV_CHANGENAME:
2616 if (idev) {
2617 snmp6_unregister_dev(idev);
2618 addrconf_sysctl_unregister(idev);
2619 addrconf_sysctl_register(idev);
2620 err = snmp6_register_dev(idev);
2621 if (err)
2622 return notifier_from_errno(err);
2623 }
2624 break;
2625
2626 case NETDEV_PRE_TYPE_CHANGE:
2627 case NETDEV_POST_TYPE_CHANGE:
2628 addrconf_type_change(dev, event);
2629 break;
2630 }
2631
2632 return NOTIFY_OK;
2633 }
2634
2635 /*
2636 * addrconf module should be notified of a device going up
2637 */
2638 static struct notifier_block ipv6_dev_notf = {
2639 .notifier_call = addrconf_notify,
2640 };
2641
2642 static void addrconf_type_change(struct net_device *dev, unsigned long event)
2643 {
2644 struct inet6_dev *idev;
2645 ASSERT_RTNL();
2646
2647 idev = __in6_dev_get(dev);
2648
2649 if (event == NETDEV_POST_TYPE_CHANGE)
2650 ipv6_mc_remap(idev);
2651 else if (event == NETDEV_PRE_TYPE_CHANGE)
2652 ipv6_mc_unmap(idev);
2653 }
2654
2655 static int addrconf_ifdown(struct net_device *dev, int how)
2656 {
2657 struct net *net = dev_net(dev);
2658 struct inet6_dev *idev;
2659 struct inet6_ifaddr *ifa;
2660 LIST_HEAD(keep_list);
2661 int state;
2662
2663 ASSERT_RTNL();
2664
2665 rt6_ifdown(net, dev);
2666 neigh_ifdown(&nd_tbl, dev);
2667
2668 idev = __in6_dev_get(dev);
2669 if (idev == NULL)
2670 return -ENODEV;
2671
2672 /*
2673 * Step 1: remove reference to ipv6 device from parent device.
2674 * Do not dev_put!
2675 */
2676 if (how) {
2677 idev->dead = 1;
2678
2679 /* protected by rtnl_lock */
2680 rcu_assign_pointer(dev->ip6_ptr, NULL);
2681
2682 /* Step 1.5: remove snmp6 entry */
2683 snmp6_unregister_dev(idev);
2684
2685 }
2686
2687 write_lock_bh(&idev->lock);
2688
2689 /* Step 2: clear flags for stateless addrconf */
2690 if (!how)
2691 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2692
2693 #ifdef CONFIG_IPV6_PRIVACY
2694 if (how && del_timer(&idev->regen_timer))
2695 in6_dev_put(idev);
2696
2697 /* Step 3: clear tempaddr list */
2698 while (!list_empty(&idev->tempaddr_list)) {
2699 ifa = list_first_entry(&idev->tempaddr_list,
2700 struct inet6_ifaddr, tmp_list);
2701 list_del(&ifa->tmp_list);
2702 write_unlock_bh(&idev->lock);
2703 spin_lock_bh(&ifa->lock);
2704
2705 if (ifa->ifpub) {
2706 in6_ifa_put(ifa->ifpub);
2707 ifa->ifpub = NULL;
2708 }
2709 spin_unlock_bh(&ifa->lock);
2710 in6_ifa_put(ifa);
2711 write_lock_bh(&idev->lock);
2712 }
2713 #endif
2714
2715 while (!list_empty(&idev->addr_list)) {
2716 ifa = list_first_entry(&idev->addr_list,
2717 struct inet6_ifaddr, if_list);
2718 addrconf_del_timer(ifa);
2719
2720 /* If just doing link down, and address is permanent
2721 and not link-local, then retain it. */
2722 if (!how &&
2723 (ifa->flags&IFA_F_PERMANENT) &&
2724 !(ipv6_addr_type(&ifa->addr) & IPV6_ADDR_LINKLOCAL)) {
2725 list_move_tail(&ifa->if_list, &keep_list);
2726
2727 /* If not doing DAD on this address, just keep it. */
2728 if ((dev->flags&(IFF_NOARP|IFF_LOOPBACK)) ||
2729 idev->cnf.accept_dad <= 0 ||
2730 (ifa->flags & IFA_F_NODAD))
2731 continue;
2732
2733 /* If it was tentative already, no need to notify */
2734 if (ifa->flags & IFA_F_TENTATIVE)
2735 continue;
2736
2737 /* Flag it for later restoration when link comes up */
2738 ifa->flags |= IFA_F_TENTATIVE;
2739 ifa->state = INET6_IFADDR_STATE_DAD;
2740
2741 write_unlock_bh(&idev->lock);
2742
2743 in6_ifa_hold(ifa);
2744 } else {
2745 list_del(&ifa->if_list);
2746
2747 /* clear hash table */
2748 spin_lock_bh(&addrconf_hash_lock);
2749 hlist_del_init_rcu(&ifa->addr_lst);
2750 spin_unlock_bh(&addrconf_hash_lock);
2751
2752 write_unlock_bh(&idev->lock);
2753 spin_lock_bh(&ifa->state_lock);
2754 state = ifa->state;
2755 ifa->state = INET6_IFADDR_STATE_DEAD;
2756 spin_unlock_bh(&ifa->state_lock);
2757
2758 if (state == INET6_IFADDR_STATE_DEAD)
2759 goto put_ifa;
2760 }
2761
2762 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2763 if (ifa->state == INET6_IFADDR_STATE_DEAD)
2764 atomic_notifier_call_chain(&inet6addr_chain,
2765 NETDEV_DOWN, ifa);
2766
2767 put_ifa:
2768 in6_ifa_put(ifa);
2769
2770 write_lock_bh(&idev->lock);
2771 }
2772
2773 list_splice(&keep_list, &idev->addr_list);
2774
2775 write_unlock_bh(&idev->lock);
2776
2777 /* Step 5: Discard multicast list */
2778 if (how)
2779 ipv6_mc_destroy_dev(idev);
2780 else
2781 ipv6_mc_down(idev);
2782
2783 idev->tstamp = jiffies;
2784
2785 /* Last: Shot the device (if unregistered) */
2786 if (how) {
2787 addrconf_sysctl_unregister(idev);
2788 neigh_parms_release(&nd_tbl, idev->nd_parms);
2789 neigh_ifdown(&nd_tbl, dev);
2790 in6_dev_put(idev);
2791 }
2792 return 0;
2793 }
2794
2795 static void addrconf_rs_timer(unsigned long data)
2796 {
2797 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2798 struct inet6_dev *idev = ifp->idev;
2799
2800 read_lock(&idev->lock);
2801 if (idev->dead || !(idev->if_flags & IF_READY))
2802 goto out;
2803
2804 if (idev->cnf.forwarding)
2805 goto out;
2806
2807 /* Announcement received after solicitation was sent */
2808 if (idev->if_flags & IF_RA_RCVD)
2809 goto out;
2810
2811 spin_lock(&ifp->lock);
2812 if (ifp->probes++ < idev->cnf.rtr_solicits) {
2813 /* The wait after the last probe can be shorter */
2814 addrconf_mod_timer(ifp, AC_RS,
2815 (ifp->probes == idev->cnf.rtr_solicits) ?
2816 idev->cnf.rtr_solicit_delay :
2817 idev->cnf.rtr_solicit_interval);
2818 spin_unlock(&ifp->lock);
2819
2820 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2821 } else {
2822 spin_unlock(&ifp->lock);
2823 /*
2824 * Note: we do not support deprecated "all on-link"
2825 * assumption any longer.
2826 */
2827 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2828 idev->dev->name);
2829 }
2830
2831 out:
2832 read_unlock(&idev->lock);
2833 in6_ifa_put(ifp);
2834 }
2835
2836 /*
2837 * Duplicate Address Detection
2838 */
2839 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2840 {
2841 unsigned long rand_num;
2842 struct inet6_dev *idev = ifp->idev;
2843
2844 if (ifp->flags & IFA_F_OPTIMISTIC)
2845 rand_num = 0;
2846 else
2847 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2848
2849 ifp->probes = idev->cnf.dad_transmits;
2850 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2851 }
2852
2853 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2854 {
2855 struct inet6_dev *idev = ifp->idev;
2856 struct net_device *dev = idev->dev;
2857
2858 addrconf_join_solict(dev, &ifp->addr);
2859
2860 net_srandom(ifp->addr.s6_addr32[3]);
2861
2862 read_lock_bh(&idev->lock);
2863 spin_lock(&ifp->lock);
2864 if (ifp->state == INET6_IFADDR_STATE_DEAD)
2865 goto out;
2866
2867 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2868 idev->cnf.accept_dad < 1 ||
2869 !(ifp->flags&IFA_F_TENTATIVE) ||
2870 ifp->flags & IFA_F_NODAD) {
2871 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
2872 spin_unlock(&ifp->lock);
2873 read_unlock_bh(&idev->lock);
2874
2875 addrconf_dad_completed(ifp);
2876 return;
2877 }
2878
2879 if (!(idev->if_flags & IF_READY)) {
2880 spin_unlock(&ifp->lock);
2881 read_unlock_bh(&idev->lock);
2882 /*
2883 * If the device is not ready:
2884 * - keep it tentative if it is a permanent address.
2885 * - otherwise, kill it.
2886 */
2887 in6_ifa_hold(ifp);
2888 addrconf_dad_stop(ifp, 0);
2889 return;
2890 }
2891
2892 /*
2893 * Optimistic nodes can start receiving
2894 * Frames right away
2895 */
2896 if (ifp->flags & IFA_F_OPTIMISTIC)
2897 ip6_ins_rt(ifp->rt);
2898
2899 addrconf_dad_kick(ifp);
2900 out:
2901 spin_unlock(&ifp->lock);
2902 read_unlock_bh(&idev->lock);
2903 }
2904
2905 static void addrconf_dad_timer(unsigned long data)
2906 {
2907 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2908 struct inet6_dev *idev = ifp->idev;
2909 struct in6_addr mcaddr;
2910
2911 if (!ifp->probes && addrconf_dad_end(ifp))
2912 goto out;
2913
2914 read_lock(&idev->lock);
2915 if (idev->dead || !(idev->if_flags & IF_READY)) {
2916 read_unlock(&idev->lock);
2917 goto out;
2918 }
2919
2920 spin_lock(&ifp->lock);
2921 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
2922 spin_unlock(&ifp->lock);
2923 read_unlock(&idev->lock);
2924 goto out;
2925 }
2926
2927 if (ifp->probes == 0) {
2928 /*
2929 * DAD was successful
2930 */
2931
2932 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
2933 spin_unlock(&ifp->lock);
2934 read_unlock(&idev->lock);
2935
2936 addrconf_dad_completed(ifp);
2937
2938 goto out;
2939 }
2940
2941 ifp->probes--;
2942 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2943 spin_unlock(&ifp->lock);
2944 read_unlock(&idev->lock);
2945
2946 /* send a neighbour solicitation for our addr */
2947 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2948 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
2949 out:
2950 in6_ifa_put(ifp);
2951 }
2952
2953 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2954 {
2955 struct net_device *dev = ifp->idev->dev;
2956
2957 /*
2958 * Configure the address for reception. Now it is valid.
2959 */
2960
2961 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2962
2963 /* If added prefix is link local and forwarding is off,
2964 start sending router solicitations.
2965 */
2966
2967 if (ifp->idev->cnf.forwarding == 0 &&
2968 ifp->idev->cnf.rtr_solicits > 0 &&
2969 (dev->flags&IFF_LOOPBACK) == 0 &&
2970 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2971 /*
2972 * If a host as already performed a random delay
2973 * [...] as part of DAD [...] there is no need
2974 * to delay again before sending the first RS
2975 */
2976 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2977
2978 spin_lock_bh(&ifp->lock);
2979 ifp->probes = 1;
2980 ifp->idev->if_flags |= IF_RS_SENT;
2981 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2982 spin_unlock_bh(&ifp->lock);
2983 }
2984 }
2985
2986 static void addrconf_dad_run(struct inet6_dev *idev)
2987 {
2988 struct inet6_ifaddr *ifp;
2989
2990 read_lock_bh(&idev->lock);
2991 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2992 spin_lock(&ifp->lock);
2993 if (ifp->flags & IFA_F_TENTATIVE &&
2994 ifp->state == INET6_IFADDR_STATE_DAD)
2995 addrconf_dad_kick(ifp);
2996 spin_unlock(&ifp->lock);
2997 }
2998 read_unlock_bh(&idev->lock);
2999 }
3000
3001 #ifdef CONFIG_PROC_FS
3002 struct if6_iter_state {
3003 struct seq_net_private p;
3004 int bucket;
3005 };
3006
3007 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
3008 {
3009 struct inet6_ifaddr *ifa = NULL;
3010 struct if6_iter_state *state = seq->private;
3011 struct net *net = seq_file_net(seq);
3012
3013 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3014 struct hlist_node *n;
3015 hlist_for_each_entry_rcu_bh(ifa, n, &inet6_addr_lst[state->bucket],
3016 addr_lst)
3017 if (net_eq(dev_net(ifa->idev->dev), net))
3018 return ifa;
3019 }
3020 return NULL;
3021 }
3022
3023 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3024 struct inet6_ifaddr *ifa)
3025 {
3026 struct if6_iter_state *state = seq->private;
3027 struct net *net = seq_file_net(seq);
3028 struct hlist_node *n = &ifa->addr_lst;
3029
3030 hlist_for_each_entry_continue_rcu_bh(ifa, n, addr_lst)
3031 if (net_eq(dev_net(ifa->idev->dev), net))
3032 return ifa;
3033
3034 while (++state->bucket < IN6_ADDR_HSIZE) {
3035 hlist_for_each_entry_rcu_bh(ifa, n,
3036 &inet6_addr_lst[state->bucket], addr_lst) {
3037 if (net_eq(dev_net(ifa->idev->dev), net))
3038 return ifa;
3039 }
3040 }
3041
3042 return NULL;
3043 }
3044
3045 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
3046 {
3047 struct inet6_ifaddr *ifa = if6_get_first(seq);
3048
3049 if (ifa)
3050 while (pos && (ifa = if6_get_next(seq, ifa)) != NULL)
3051 --pos;
3052 return pos ? NULL : ifa;
3053 }
3054
3055 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3056 __acquires(rcu_bh)
3057 {
3058 rcu_read_lock_bh();
3059 return if6_get_idx(seq, *pos);
3060 }
3061
3062 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3063 {
3064 struct inet6_ifaddr *ifa;
3065
3066 ifa = if6_get_next(seq, v);
3067 ++*pos;
3068 return ifa;
3069 }
3070
3071 static void if6_seq_stop(struct seq_file *seq, void *v)
3072 __releases(rcu_bh)
3073 {
3074 rcu_read_unlock_bh();
3075 }
3076
3077 static int if6_seq_show(struct seq_file *seq, void *v)
3078 {
3079 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3080 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3081 &ifp->addr,
3082 ifp->idev->dev->ifindex,
3083 ifp->prefix_len,
3084 ifp->scope,
3085 ifp->flags,
3086 ifp->idev->dev->name);
3087 return 0;
3088 }
3089
3090 static const struct seq_operations if6_seq_ops = {
3091 .start = if6_seq_start,
3092 .next = if6_seq_next,
3093 .show = if6_seq_show,
3094 .stop = if6_seq_stop,
3095 };
3096
3097 static int if6_seq_open(struct inode *inode, struct file *file)
3098 {
3099 return seq_open_net(inode, file, &if6_seq_ops,
3100 sizeof(struct if6_iter_state));
3101 }
3102
3103 static const struct file_operations if6_fops = {
3104 .owner = THIS_MODULE,
3105 .open = if6_seq_open,
3106 .read = seq_read,
3107 .llseek = seq_lseek,
3108 .release = seq_release_net,
3109 };
3110
3111 static int __net_init if6_proc_net_init(struct net *net)
3112 {
3113 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
3114 return -ENOMEM;
3115 return 0;
3116 }
3117
3118 static void __net_exit if6_proc_net_exit(struct net *net)
3119 {
3120 proc_net_remove(net, "if_inet6");
3121 }
3122
3123 static struct pernet_operations if6_proc_net_ops = {
3124 .init = if6_proc_net_init,
3125 .exit = if6_proc_net_exit,
3126 };
3127
3128 int __init if6_proc_init(void)
3129 {
3130 return register_pernet_subsys(&if6_proc_net_ops);
3131 }
3132
3133 void if6_proc_exit(void)
3134 {
3135 unregister_pernet_subsys(&if6_proc_net_ops);
3136 }
3137 #endif /* CONFIG_PROC_FS */
3138
3139 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3140 /* Check if address is a home address configured on any interface. */
3141 int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr)
3142 {
3143 int ret = 0;
3144 struct inet6_ifaddr *ifp = NULL;
3145 struct hlist_node *n;
3146 unsigned int hash = ipv6_addr_hash(addr);
3147
3148 rcu_read_lock_bh();
3149 hlist_for_each_entry_rcu_bh(ifp, n, &inet6_addr_lst[hash], addr_lst) {
3150 if (!net_eq(dev_net(ifp->idev->dev), net))
3151 continue;
3152 if (ipv6_addr_equal(&ifp->addr, addr) &&
3153 (ifp->flags & IFA_F_HOMEADDRESS)) {
3154 ret = 1;
3155 break;
3156 }
3157 }
3158 rcu_read_unlock_bh();
3159 return ret;
3160 }
3161 #endif
3162
3163 /*
3164 * Periodic address status verification
3165 */
3166
3167 static void addrconf_verify(unsigned long foo)
3168 {
3169 unsigned long now, next, next_sec, next_sched;
3170 struct inet6_ifaddr *ifp;
3171 struct hlist_node *node;
3172 int i;
3173
3174 rcu_read_lock_bh();
3175 spin_lock(&addrconf_verify_lock);
3176 now = jiffies;
3177 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3178
3179 del_timer(&addr_chk_timer);
3180
3181 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3182 restart:
3183 hlist_for_each_entry_rcu_bh(ifp, node,
3184 &inet6_addr_lst[i], addr_lst) {
3185 unsigned long age;
3186
3187 if (ifp->flags & IFA_F_PERMANENT)
3188 continue;
3189
3190 spin_lock(&ifp->lock);
3191 /* We try to batch several events at once. */
3192 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3193
3194 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3195 age >= ifp->valid_lft) {
3196 spin_unlock(&ifp->lock);
3197 in6_ifa_hold(ifp);
3198 ipv6_del_addr(ifp);
3199 goto restart;
3200 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3201 spin_unlock(&ifp->lock);
3202 continue;
3203 } else if (age >= ifp->prefered_lft) {
3204 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3205 int deprecate = 0;
3206
3207 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3208 deprecate = 1;
3209 ifp->flags |= IFA_F_DEPRECATED;
3210 }
3211
3212 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3213 next = ifp->tstamp + ifp->valid_lft * HZ;
3214
3215 spin_unlock(&ifp->lock);
3216
3217 if (deprecate) {
3218 in6_ifa_hold(ifp);
3219
3220 ipv6_ifa_notify(0, ifp);
3221 in6_ifa_put(ifp);
3222 goto restart;
3223 }
3224 #ifdef CONFIG_IPV6_PRIVACY
3225 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3226 !(ifp->flags&IFA_F_TENTATIVE)) {
3227 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3228 ifp->idev->cnf.dad_transmits *
3229 ifp->idev->nd_parms->retrans_time / HZ;
3230
3231 if (age >= ifp->prefered_lft - regen_advance) {
3232 struct inet6_ifaddr *ifpub = ifp->ifpub;
3233 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3234 next = ifp->tstamp + ifp->prefered_lft * HZ;
3235 if (!ifp->regen_count && ifpub) {
3236 ifp->regen_count++;
3237 in6_ifa_hold(ifp);
3238 in6_ifa_hold(ifpub);
3239 spin_unlock(&ifp->lock);
3240
3241 spin_lock(&ifpub->lock);
3242 ifpub->regen_count = 0;
3243 spin_unlock(&ifpub->lock);
3244 ipv6_create_tempaddr(ifpub, ifp);
3245 in6_ifa_put(ifpub);
3246 in6_ifa_put(ifp);
3247 goto restart;
3248 }
3249 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3250 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3251 spin_unlock(&ifp->lock);
3252 #endif
3253 } else {
3254 /* ifp->prefered_lft <= ifp->valid_lft */
3255 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3256 next = ifp->tstamp + ifp->prefered_lft * HZ;
3257 spin_unlock(&ifp->lock);
3258 }
3259 }
3260 }
3261
3262 next_sec = round_jiffies_up(next);
3263 next_sched = next;
3264
3265 /* If rounded timeout is accurate enough, accept it. */
3266 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3267 next_sched = next_sec;
3268
3269 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3270 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3271 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3272
3273 ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3274 now, next, next_sec, next_sched));
3275
3276 addr_chk_timer.expires = next_sched;
3277 add_timer(&addr_chk_timer);
3278 spin_unlock(&addrconf_verify_lock);
3279 rcu_read_unlock_bh();
3280 }
3281
3282 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3283 {
3284 struct in6_addr *pfx = NULL;
3285
3286 if (addr)
3287 pfx = nla_data(addr);
3288
3289 if (local) {
3290 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3291 pfx = NULL;
3292 else
3293 pfx = nla_data(local);
3294 }
3295
3296 return pfx;
3297 }
3298
3299 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3300 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3301 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3302 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3303 };
3304
3305 static int
3306 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3307 {
3308 struct net *net = sock_net(skb->sk);
3309 struct ifaddrmsg *ifm;
3310 struct nlattr *tb[IFA_MAX+1];
3311 struct in6_addr *pfx;
3312 int err;
3313
3314 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3315 if (err < 0)
3316 return err;
3317
3318 ifm = nlmsg_data(nlh);
3319 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3320 if (pfx == NULL)
3321 return -EINVAL;
3322
3323 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3324 }
3325
3326 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3327 u32 prefered_lft, u32 valid_lft)
3328 {
3329 u32 flags;
3330 clock_t expires;
3331 unsigned long timeout;
3332
3333 if (!valid_lft || (prefered_lft > valid_lft))
3334 return -EINVAL;
3335
3336 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3337 if (addrconf_finite_timeout(timeout)) {
3338 expires = jiffies_to_clock_t(timeout * HZ);
3339 valid_lft = timeout;
3340 flags = RTF_EXPIRES;
3341 } else {
3342 expires = 0;
3343 flags = 0;
3344 ifa_flags |= IFA_F_PERMANENT;
3345 }
3346
3347 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3348 if (addrconf_finite_timeout(timeout)) {
3349 if (timeout == 0)
3350 ifa_flags |= IFA_F_DEPRECATED;
3351 prefered_lft = timeout;
3352 }
3353
3354 spin_lock_bh(&ifp->lock);
3355 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3356 ifp->tstamp = jiffies;
3357 ifp->valid_lft = valid_lft;
3358 ifp->prefered_lft = prefered_lft;
3359
3360 spin_unlock_bh(&ifp->lock);
3361 if (!(ifp->flags&IFA_F_TENTATIVE))
3362 ipv6_ifa_notify(0, ifp);
3363
3364 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3365 expires, flags);
3366 addrconf_verify(0);
3367
3368 return 0;
3369 }
3370
3371 static int
3372 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3373 {
3374 struct net *net = sock_net(skb->sk);
3375 struct ifaddrmsg *ifm;
3376 struct nlattr *tb[IFA_MAX+1];
3377 struct in6_addr *pfx;
3378 struct inet6_ifaddr *ifa;
3379 struct net_device *dev;
3380 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3381 u8 ifa_flags;
3382 int err;
3383
3384 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3385 if (err < 0)
3386 return err;
3387
3388 ifm = nlmsg_data(nlh);
3389 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3390 if (pfx == NULL)
3391 return -EINVAL;
3392
3393 if (tb[IFA_CACHEINFO]) {
3394 struct ifa_cacheinfo *ci;
3395
3396 ci = nla_data(tb[IFA_CACHEINFO]);
3397 valid_lft = ci->ifa_valid;
3398 preferred_lft = ci->ifa_prefered;
3399 } else {
3400 preferred_lft = INFINITY_LIFE_TIME;
3401 valid_lft = INFINITY_LIFE_TIME;
3402 }
3403
3404 dev = __dev_get_by_index(net, ifm->ifa_index);
3405 if (dev == NULL)
3406 return -ENODEV;
3407
3408 /* We ignore other flags so far. */
3409 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3410
3411 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3412 if (ifa == NULL) {
3413 /*
3414 * It would be best to check for !NLM_F_CREATE here but
3415 * userspace alreay relies on not having to provide this.
3416 */
3417 return inet6_addr_add(net, ifm->ifa_index, pfx,
3418 ifm->ifa_prefixlen, ifa_flags,
3419 preferred_lft, valid_lft);
3420 }
3421
3422 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3423 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3424 err = -EEXIST;
3425 else
3426 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3427
3428 in6_ifa_put(ifa);
3429
3430 return err;
3431 }
3432
3433 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3434 u8 scope, int ifindex)
3435 {
3436 struct ifaddrmsg *ifm;
3437
3438 ifm = nlmsg_data(nlh);
3439 ifm->ifa_family = AF_INET6;
3440 ifm->ifa_prefixlen = prefixlen;
3441 ifm->ifa_flags = flags;
3442 ifm->ifa_scope = scope;
3443 ifm->ifa_index = ifindex;
3444 }
3445
3446 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3447 unsigned long tstamp, u32 preferred, u32 valid)
3448 {
3449 struct ifa_cacheinfo ci;
3450
3451 ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3452 + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3453 ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3454 + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3455 ci.ifa_prefered = preferred;
3456 ci.ifa_valid = valid;
3457
3458 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3459 }
3460
3461 static inline int rt_scope(int ifa_scope)
3462 {
3463 if (ifa_scope & IFA_HOST)
3464 return RT_SCOPE_HOST;
3465 else if (ifa_scope & IFA_LINK)
3466 return RT_SCOPE_LINK;
3467 else if (ifa_scope & IFA_SITE)
3468 return RT_SCOPE_SITE;
3469 else
3470 return RT_SCOPE_UNIVERSE;
3471 }
3472
3473 static inline int inet6_ifaddr_msgsize(void)
3474 {
3475 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3476 + nla_total_size(16) /* IFA_ADDRESS */
3477 + nla_total_size(sizeof(struct ifa_cacheinfo));
3478 }
3479
3480 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3481 u32 pid, u32 seq, int event, unsigned int flags)
3482 {
3483 struct nlmsghdr *nlh;
3484 u32 preferred, valid;
3485
3486 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3487 if (nlh == NULL)
3488 return -EMSGSIZE;
3489
3490 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3491 ifa->idev->dev->ifindex);
3492
3493 if (!(ifa->flags&IFA_F_PERMANENT)) {
3494 preferred = ifa->prefered_lft;
3495 valid = ifa->valid_lft;
3496 if (preferred != INFINITY_LIFE_TIME) {
3497 long tval = (jiffies - ifa->tstamp)/HZ;
3498 if (preferred > tval)
3499 preferred -= tval;
3500 else
3501 preferred = 0;
3502 if (valid != INFINITY_LIFE_TIME) {
3503 if (valid > tval)
3504 valid -= tval;
3505 else
3506 valid = 0;
3507 }
3508 }
3509 } else {
3510 preferred = INFINITY_LIFE_TIME;
3511 valid = INFINITY_LIFE_TIME;
3512 }
3513
3514 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3515 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3516 nlmsg_cancel(skb, nlh);
3517 return -EMSGSIZE;
3518 }
3519
3520 return nlmsg_end(skb, nlh);
3521 }
3522
3523 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3524 u32 pid, u32 seq, int event, u16 flags)
3525 {
3526 struct nlmsghdr *nlh;
3527 u8 scope = RT_SCOPE_UNIVERSE;
3528 int ifindex = ifmca->idev->dev->ifindex;
3529
3530 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3531 scope = RT_SCOPE_SITE;
3532
3533 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3534 if (nlh == NULL)
3535 return -EMSGSIZE;
3536
3537 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3538 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3539 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3540 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3541 nlmsg_cancel(skb, nlh);
3542 return -EMSGSIZE;
3543 }
3544
3545 return nlmsg_end(skb, nlh);
3546 }
3547
3548 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3549 u32 pid, u32 seq, int event, unsigned int flags)
3550 {
3551 struct nlmsghdr *nlh;
3552 u8 scope = RT_SCOPE_UNIVERSE;
3553 int ifindex = ifaca->aca_idev->dev->ifindex;
3554
3555 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3556 scope = RT_SCOPE_SITE;
3557
3558 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3559 if (nlh == NULL)
3560 return -EMSGSIZE;
3561
3562 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3563 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3564 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3565 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3566 nlmsg_cancel(skb, nlh);
3567 return -EMSGSIZE;
3568 }
3569
3570 return nlmsg_end(skb, nlh);
3571 }
3572
3573 enum addr_type_t {
3574 UNICAST_ADDR,
3575 MULTICAST_ADDR,
3576 ANYCAST_ADDR,
3577 };
3578
3579 /* called with rcu_read_lock() */
3580 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3581 struct netlink_callback *cb, enum addr_type_t type,
3582 int s_ip_idx, int *p_ip_idx)
3583 {
3584 struct ifmcaddr6 *ifmca;
3585 struct ifacaddr6 *ifaca;
3586 int err = 1;
3587 int ip_idx = *p_ip_idx;
3588
3589 read_lock_bh(&idev->lock);
3590 switch (type) {
3591 case UNICAST_ADDR: {
3592 struct inet6_ifaddr *ifa;
3593
3594 /* unicast address incl. temp addr */
3595 list_for_each_entry(ifa, &idev->addr_list, if_list) {
3596 if (++ip_idx < s_ip_idx)
3597 continue;
3598 err = inet6_fill_ifaddr(skb, ifa,
3599 NETLINK_CB(cb->skb).pid,
3600 cb->nlh->nlmsg_seq,
3601 RTM_NEWADDR,
3602 NLM_F_MULTI);
3603 if (err <= 0)
3604 break;
3605 }
3606 break;
3607 }
3608 case MULTICAST_ADDR:
3609 /* multicast address */
3610 for (ifmca = idev->mc_list; ifmca;
3611 ifmca = ifmca->next, ip_idx++) {
3612 if (ip_idx < s_ip_idx)
3613 continue;
3614 err = inet6_fill_ifmcaddr(skb, ifmca,
3615 NETLINK_CB(cb->skb).pid,
3616 cb->nlh->nlmsg_seq,
3617 RTM_GETMULTICAST,
3618 NLM_F_MULTI);
3619 if (err <= 0)
3620 break;
3621 }
3622 break;
3623 case ANYCAST_ADDR:
3624 /* anycast address */
3625 for (ifaca = idev->ac_list; ifaca;
3626 ifaca = ifaca->aca_next, ip_idx++) {
3627 if (ip_idx < s_ip_idx)
3628 continue;
3629 err = inet6_fill_ifacaddr(skb, ifaca,
3630 NETLINK_CB(cb->skb).pid,
3631 cb->nlh->nlmsg_seq,
3632 RTM_GETANYCAST,
3633 NLM_F_MULTI);
3634 if (err <= 0)
3635 break;
3636 }
3637 break;
3638 default:
3639 break;
3640 }
3641 read_unlock_bh(&idev->lock);
3642 *p_ip_idx = ip_idx;
3643 return err;
3644 }
3645
3646 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3647 enum addr_type_t type)
3648 {
3649 struct net *net = sock_net(skb->sk);
3650 int h, s_h;
3651 int idx, ip_idx;
3652 int s_idx, s_ip_idx;
3653 struct net_device *dev;
3654 struct inet6_dev *idev;
3655 struct hlist_head *head;
3656 struct hlist_node *node;
3657
3658 s_h = cb->args[0];
3659 s_idx = idx = cb->args[1];
3660 s_ip_idx = ip_idx = cb->args[2];
3661
3662 rcu_read_lock();
3663 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3664 idx = 0;
3665 head = &net->dev_index_head[h];
3666 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3667 if (idx < s_idx)
3668 goto cont;
3669 if (h > s_h || idx > s_idx)
3670 s_ip_idx = 0;
3671 ip_idx = 0;
3672 idev = __in6_dev_get(dev);
3673 if (!idev)
3674 goto cont;
3675
3676 if (in6_dump_addrs(idev, skb, cb, type,
3677 s_ip_idx, &ip_idx) <= 0)
3678 goto done;
3679 cont:
3680 idx++;
3681 }
3682 }
3683 done:
3684 rcu_read_unlock();
3685 cb->args[0] = h;
3686 cb->args[1] = idx;
3687 cb->args[2] = ip_idx;
3688
3689 return skb->len;
3690 }
3691
3692 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3693 {
3694 enum addr_type_t type = UNICAST_ADDR;
3695
3696 return inet6_dump_addr(skb, cb, type);
3697 }
3698
3699 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3700 {
3701 enum addr_type_t type = MULTICAST_ADDR;
3702
3703 return inet6_dump_addr(skb, cb, type);
3704 }
3705
3706
3707 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3708 {
3709 enum addr_type_t type = ANYCAST_ADDR;
3710
3711 return inet6_dump_addr(skb, cb, type);
3712 }
3713
3714 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3715 void *arg)
3716 {
3717 struct net *net = sock_net(in_skb->sk);
3718 struct ifaddrmsg *ifm;
3719 struct nlattr *tb[IFA_MAX+1];
3720 struct in6_addr *addr = NULL;
3721 struct net_device *dev = NULL;
3722 struct inet6_ifaddr *ifa;
3723 struct sk_buff *skb;
3724 int err;
3725
3726 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3727 if (err < 0)
3728 goto errout;
3729
3730 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3731 if (addr == NULL) {
3732 err = -EINVAL;
3733 goto errout;
3734 }
3735
3736 ifm = nlmsg_data(nlh);
3737 if (ifm->ifa_index)
3738 dev = __dev_get_by_index(net, ifm->ifa_index);
3739
3740 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
3741 if (!ifa) {
3742 err = -EADDRNOTAVAIL;
3743 goto errout;
3744 }
3745
3746 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
3747 if (!skb) {
3748 err = -ENOBUFS;
3749 goto errout_ifa;
3750 }
3751
3752 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3753 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3754 if (err < 0) {
3755 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3756 WARN_ON(err == -EMSGSIZE);
3757 kfree_skb(skb);
3758 goto errout_ifa;
3759 }
3760 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
3761 errout_ifa:
3762 in6_ifa_put(ifa);
3763 errout:
3764 return err;
3765 }
3766
3767 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3768 {
3769 struct sk_buff *skb;
3770 struct net *net = dev_net(ifa->idev->dev);
3771 int err = -ENOBUFS;
3772
3773 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3774 if (skb == NULL)
3775 goto errout;
3776
3777 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3778 if (err < 0) {
3779 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3780 WARN_ON(err == -EMSGSIZE);
3781 kfree_skb(skb);
3782 goto errout;
3783 }
3784 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3785 return;
3786 errout:
3787 if (err < 0)
3788 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3789 }
3790
3791 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3792 __s32 *array, int bytes)
3793 {
3794 BUG_ON(bytes < (DEVCONF_MAX * 4));
3795
3796 memset(array, 0, bytes);
3797 array[DEVCONF_FORWARDING] = cnf->forwarding;
3798 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3799 array[DEVCONF_MTU6] = cnf->mtu6;
3800 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3801 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3802 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3803 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3804 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3805 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3806 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3807 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3808 #ifdef CONFIG_IPV6_PRIVACY
3809 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3810 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3811 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3812 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3813 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3814 #endif
3815 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3816 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3817 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3818 #ifdef CONFIG_IPV6_ROUTER_PREF
3819 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3820 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
3821 #ifdef CONFIG_IPV6_ROUTE_INFO
3822 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3823 #endif
3824 #endif
3825 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3826 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3827 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3828 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3829 #endif
3830 #ifdef CONFIG_IPV6_MROUTE
3831 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
3832 #endif
3833 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
3834 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
3835 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
3836 }
3837
3838 static inline size_t inet6_if_nlmsg_size(void)
3839 {
3840 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3841 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3842 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3843 + nla_total_size(4) /* IFLA_MTU */
3844 + nla_total_size(4) /* IFLA_LINK */
3845 + nla_total_size( /* IFLA_PROTINFO */
3846 nla_total_size(4) /* IFLA_INET6_FLAGS */
3847 + nla_total_size(sizeof(struct ifla_cacheinfo))
3848 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3849 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3850 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
3851 );
3852 }
3853
3854 static inline void __snmp6_fill_stats(u64 *stats, void __percpu **mib,
3855 int items, int bytes)
3856 {
3857 int i;
3858 int pad = bytes - sizeof(u64) * items;
3859 BUG_ON(pad < 0);
3860
3861 /* Use put_unaligned() because stats may not be aligned for u64. */
3862 put_unaligned(items, &stats[0]);
3863 for (i = 1; i < items; i++)
3864 put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3865
3866 memset(&stats[items], 0, pad);
3867 }
3868
3869 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib,
3870 int items, int bytes, size_t syncpoff)
3871 {
3872 int i;
3873 int pad = bytes - sizeof(u64) * items;
3874 BUG_ON(pad < 0);
3875
3876 /* Use put_unaligned() because stats may not be aligned for u64. */
3877 put_unaligned(items, &stats[0]);
3878 for (i = 1; i < items; i++)
3879 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
3880
3881 memset(&stats[items], 0, pad);
3882 }
3883
3884 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3885 int bytes)
3886 {
3887 switch (attrtype) {
3888 case IFLA_INET6_STATS:
3889 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6,
3890 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
3891 break;
3892 case IFLA_INET6_ICMP6STATS:
3893 __snmp6_fill_stats(stats, (void __percpu **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
3894 break;
3895 }
3896 }
3897
3898 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3899 u32 pid, u32 seq, int event, unsigned int flags)
3900 {
3901 struct net_device *dev = idev->dev;
3902 struct nlattr *nla;
3903 struct ifinfomsg *hdr;
3904 struct nlmsghdr *nlh;
3905 void *protoinfo;
3906 struct ifla_cacheinfo ci;
3907
3908 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3909 if (nlh == NULL)
3910 return -EMSGSIZE;
3911
3912 hdr = nlmsg_data(nlh);
3913 hdr->ifi_family = AF_INET6;
3914 hdr->__ifi_pad = 0;
3915 hdr->ifi_type = dev->type;
3916 hdr->ifi_index = dev->ifindex;
3917 hdr->ifi_flags = dev_get_flags(dev);
3918 hdr->ifi_change = 0;
3919
3920 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
3921
3922 if (dev->addr_len)
3923 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3924
3925 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
3926 if (dev->ifindex != dev->iflink)
3927 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
3928
3929 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3930 if (protoinfo == NULL)
3931 goto nla_put_failure;
3932
3933 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
3934
3935 ci.max_reasm_len = IPV6_MAXPLEN;
3936 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3937 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3938 ci.reachable_time = idev->nd_parms->reachable_time;
3939 ci.retrans_time = idev->nd_parms->retrans_time;
3940 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3941
3942 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3943 if (nla == NULL)
3944 goto nla_put_failure;
3945 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
3946
3947 /* XXX - MC not implemented */
3948
3949 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3950 if (nla == NULL)
3951 goto nla_put_failure;
3952 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3953
3954 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3955 if (nla == NULL)
3956 goto nla_put_failure;
3957 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
3958
3959 nla_nest_end(skb, protoinfo);
3960 return nlmsg_end(skb, nlh);
3961
3962 nla_put_failure:
3963 nlmsg_cancel(skb, nlh);
3964 return -EMSGSIZE;
3965 }
3966
3967 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3968 {
3969 struct net *net = sock_net(skb->sk);
3970 int h, s_h;
3971 int idx = 0, s_idx;
3972 struct net_device *dev;
3973 struct inet6_dev *idev;
3974 struct hlist_head *head;
3975 struct hlist_node *node;
3976
3977 s_h = cb->args[0];
3978 s_idx = cb->args[1];
3979
3980 rcu_read_lock();
3981 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3982 idx = 0;
3983 head = &net->dev_index_head[h];
3984 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3985 if (idx < s_idx)
3986 goto cont;
3987 idev = __in6_dev_get(dev);
3988 if (!idev)
3989 goto cont;
3990 if (inet6_fill_ifinfo(skb, idev,
3991 NETLINK_CB(cb->skb).pid,
3992 cb->nlh->nlmsg_seq,
3993 RTM_NEWLINK, NLM_F_MULTI) <= 0)
3994 goto out;
3995 cont:
3996 idx++;
3997 }
3998 }
3999 out:
4000 rcu_read_unlock();
4001 cb->args[1] = idx;
4002 cb->args[0] = h;
4003
4004 return skb->len;
4005 }
4006
4007 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4008 {
4009 struct sk_buff *skb;
4010 struct net *net = dev_net(idev->dev);
4011 int err = -ENOBUFS;
4012
4013 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
4014 if (skb == NULL)
4015 goto errout;
4016
4017 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
4018 if (err < 0) {
4019 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4020 WARN_ON(err == -EMSGSIZE);
4021 kfree_skb(skb);
4022 goto errout;
4023 }
4024 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4025 return;
4026 errout:
4027 if (err < 0)
4028 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
4029 }
4030
4031 static inline size_t inet6_prefix_nlmsg_size(void)
4032 {
4033 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4034 + nla_total_size(sizeof(struct in6_addr))
4035 + nla_total_size(sizeof(struct prefix_cacheinfo));
4036 }
4037
4038 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
4039 struct prefix_info *pinfo, u32 pid, u32 seq,
4040 int event, unsigned int flags)
4041 {
4042 struct prefixmsg *pmsg;
4043 struct nlmsghdr *nlh;
4044 struct prefix_cacheinfo ci;
4045
4046 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
4047 if (nlh == NULL)
4048 return -EMSGSIZE;
4049
4050 pmsg = nlmsg_data(nlh);
4051 pmsg->prefix_family = AF_INET6;
4052 pmsg->prefix_pad1 = 0;
4053 pmsg->prefix_pad2 = 0;
4054 pmsg->prefix_ifindex = idev->dev->ifindex;
4055 pmsg->prefix_len = pinfo->prefix_len;
4056 pmsg->prefix_type = pinfo->type;
4057 pmsg->prefix_pad3 = 0;
4058 pmsg->prefix_flags = 0;
4059 if (pinfo->onlink)
4060 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4061 if (pinfo->autoconf)
4062 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4063
4064 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
4065
4066 ci.preferred_time = ntohl(pinfo->prefered);
4067 ci.valid_time = ntohl(pinfo->valid);
4068 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
4069
4070 return nlmsg_end(skb, nlh);
4071
4072 nla_put_failure:
4073 nlmsg_cancel(skb, nlh);
4074 return -EMSGSIZE;
4075 }
4076
4077 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
4078 struct prefix_info *pinfo)
4079 {
4080 struct sk_buff *skb;
4081 struct net *net = dev_net(idev->dev);
4082 int err = -ENOBUFS;
4083
4084 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
4085 if (skb == NULL)
4086 goto errout;
4087
4088 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
4089 if (err < 0) {
4090 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4091 WARN_ON(err == -EMSGSIZE);
4092 kfree_skb(skb);
4093 goto errout;
4094 }
4095 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4096 return;
4097 errout:
4098 if (err < 0)
4099 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
4100 }
4101
4102 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4103 {
4104 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4105
4106 switch (event) {
4107 case RTM_NEWADDR:
4108 /*
4109 * If the address was optimistic
4110 * we inserted the route at the start of
4111 * our DAD process, so we don't need
4112 * to do it again
4113 */
4114 if (!(ifp->rt->rt6i_node))
4115 ip6_ins_rt(ifp->rt);
4116 if (ifp->idev->cnf.forwarding)
4117 addrconf_join_anycast(ifp);
4118 break;
4119 case RTM_DELADDR:
4120 if (ifp->idev->cnf.forwarding)
4121 addrconf_leave_anycast(ifp);
4122 addrconf_leave_solict(ifp->idev, &ifp->addr);
4123 dst_hold(&ifp->rt->dst);
4124
4125 if (ifp->state == INET6_IFADDR_STATE_DEAD &&
4126 ip6_del_rt(ifp->rt))
4127 dst_free(&ifp->rt->dst);
4128 break;
4129 }
4130 }
4131
4132 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4133 {
4134 rcu_read_lock_bh();
4135 if (likely(ifp->idev->dead == 0))
4136 __ipv6_ifa_notify(event, ifp);
4137 rcu_read_unlock_bh();
4138 }
4139
4140 #ifdef CONFIG_SYSCTL
4141
4142 static
4143 int addrconf_sysctl_forward(ctl_table *ctl, int write,
4144 void __user *buffer, size_t *lenp, loff_t *ppos)
4145 {
4146 int *valp = ctl->data;
4147 int val = *valp;
4148 loff_t pos = *ppos;
4149 int ret;
4150
4151 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
4152
4153 if (write)
4154 ret = addrconf_fixup_forwarding(ctl, valp, val);
4155 if (ret)
4156 *ppos = pos;
4157 return ret;
4158 }
4159
4160 static void dev_disable_change(struct inet6_dev *idev)
4161 {
4162 if (!idev || !idev->dev)
4163 return;
4164
4165 if (idev->cnf.disable_ipv6)
4166 addrconf_notify(NULL, NETDEV_DOWN, idev->dev);
4167 else
4168 addrconf_notify(NULL, NETDEV_UP, idev->dev);
4169 }
4170
4171 static void addrconf_disable_change(struct net *net, __s32 newf)
4172 {
4173 struct net_device *dev;
4174 struct inet6_dev *idev;
4175
4176 rcu_read_lock();
4177 for_each_netdev_rcu(net, dev) {
4178 idev = __in6_dev_get(dev);
4179 if (idev) {
4180 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4181 idev->cnf.disable_ipv6 = newf;
4182 if (changed)
4183 dev_disable_change(idev);
4184 }
4185 }
4186 rcu_read_unlock();
4187 }
4188
4189 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int old)
4190 {
4191 struct net *net;
4192
4193 net = (struct net *)table->extra2;
4194
4195 if (p == &net->ipv6.devconf_dflt->disable_ipv6)
4196 return 0;
4197
4198 if (!rtnl_trylock()) {
4199 /* Restore the original values before restarting */
4200 *p = old;
4201 return restart_syscall();
4202 }
4203
4204 if (p == &net->ipv6.devconf_all->disable_ipv6) {
4205 __s32 newf = net->ipv6.devconf_all->disable_ipv6;
4206 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4207 addrconf_disable_change(net, newf);
4208 } else if ((!*p) ^ (!old))
4209 dev_disable_change((struct inet6_dev *)table->extra1);
4210
4211 rtnl_unlock();
4212 return 0;
4213 }
4214
4215 static
4216 int addrconf_sysctl_disable(ctl_table *ctl, int write,
4217 void __user *buffer, size_t *lenp, loff_t *ppos)
4218 {
4219 int *valp = ctl->data;
4220 int val = *valp;
4221 loff_t pos = *ppos;
4222 int ret;
4223
4224 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
4225
4226 if (write)
4227 ret = addrconf_disable_ipv6(ctl, valp, val);
4228 if (ret)
4229 *ppos = pos;
4230 return ret;
4231 }
4232
4233 static struct addrconf_sysctl_table
4234 {
4235 struct ctl_table_header *sysctl_header;
4236 ctl_table addrconf_vars[DEVCONF_MAX+1];
4237 char *dev_name;
4238 } addrconf_sysctl __read_mostly = {
4239 .sysctl_header = NULL,
4240 .addrconf_vars = {
4241 {
4242 .procname = "forwarding",
4243 .data = &ipv6_devconf.forwarding,
4244 .maxlen = sizeof(int),
4245 .mode = 0644,
4246 .proc_handler = addrconf_sysctl_forward,
4247 },
4248 {
4249 .procname = "hop_limit",
4250 .data = &ipv6_devconf.hop_limit,
4251 .maxlen = sizeof(int),
4252 .mode = 0644,
4253 .proc_handler = proc_dointvec,
4254 },
4255 {
4256 .procname = "mtu",
4257 .data = &ipv6_devconf.mtu6,
4258 .maxlen = sizeof(int),
4259 .mode = 0644,
4260 .proc_handler = proc_dointvec,
4261 },
4262 {
4263 .procname = "accept_ra",
4264 .data = &ipv6_devconf.accept_ra,
4265 .maxlen = sizeof(int),
4266 .mode = 0644,
4267 .proc_handler = proc_dointvec,
4268 },
4269 {
4270 .procname = "accept_redirects",
4271 .data = &ipv6_devconf.accept_redirects,
4272 .maxlen = sizeof(int),
4273 .mode = 0644,
4274 .proc_handler = proc_dointvec,
4275 },
4276 {
4277 .procname = "autoconf",
4278 .data = &ipv6_devconf.autoconf,
4279 .maxlen = sizeof(int),
4280 .mode = 0644,
4281 .proc_handler = proc_dointvec,
4282 },
4283 {
4284 .procname = "dad_transmits",
4285 .data = &ipv6_devconf.dad_transmits,
4286 .maxlen = sizeof(int),
4287 .mode = 0644,
4288 .proc_handler = proc_dointvec,
4289 },
4290 {
4291 .procname = "router_solicitations",
4292 .data = &ipv6_devconf.rtr_solicits,
4293 .maxlen = sizeof(int),
4294 .mode = 0644,
4295 .proc_handler = proc_dointvec,
4296 },
4297 {
4298 .procname = "router_solicitation_interval",
4299 .data = &ipv6_devconf.rtr_solicit_interval,
4300 .maxlen = sizeof(int),
4301 .mode = 0644,
4302 .proc_handler = proc_dointvec_jiffies,
4303 },
4304 {
4305 .procname = "router_solicitation_delay",
4306 .data = &ipv6_devconf.rtr_solicit_delay,
4307 .maxlen = sizeof(int),
4308 .mode = 0644,
4309 .proc_handler = proc_dointvec_jiffies,
4310 },
4311 {
4312 .procname = "force_mld_version",
4313 .data = &ipv6_devconf.force_mld_version,
4314 .maxlen = sizeof(int),
4315 .mode = 0644,
4316 .proc_handler = proc_dointvec,
4317 },
4318 #ifdef CONFIG_IPV6_PRIVACY
4319 {
4320 .procname = "use_tempaddr",
4321 .data = &ipv6_devconf.use_tempaddr,
4322 .maxlen = sizeof(int),
4323 .mode = 0644,
4324 .proc_handler = proc_dointvec,
4325 },
4326 {
4327 .procname = "temp_valid_lft",
4328 .data = &ipv6_devconf.temp_valid_lft,
4329 .maxlen = sizeof(int),
4330 .mode = 0644,
4331 .proc_handler = proc_dointvec,
4332 },
4333 {
4334 .procname = "temp_prefered_lft",
4335 .data = &ipv6_devconf.temp_prefered_lft,
4336 .maxlen = sizeof(int),
4337 .mode = 0644,
4338 .proc_handler = proc_dointvec,
4339 },
4340 {
4341 .procname = "regen_max_retry",
4342 .data = &ipv6_devconf.regen_max_retry,
4343 .maxlen = sizeof(int),
4344 .mode = 0644,
4345 .proc_handler = proc_dointvec,
4346 },
4347 {
4348 .procname = "max_desync_factor",
4349 .data = &ipv6_devconf.max_desync_factor,
4350 .maxlen = sizeof(int),
4351 .mode = 0644,
4352 .proc_handler = proc_dointvec,
4353 },
4354 #endif
4355 {
4356 .procname = "max_addresses",
4357 .data = &ipv6_devconf.max_addresses,
4358 .maxlen = sizeof(int),
4359 .mode = 0644,
4360 .proc_handler = proc_dointvec,
4361 },
4362 {
4363 .procname = "accept_ra_defrtr",
4364 .data = &ipv6_devconf.accept_ra_defrtr,
4365 .maxlen = sizeof(int),
4366 .mode = 0644,
4367 .proc_handler = proc_dointvec,
4368 },
4369 {
4370 .procname = "accept_ra_pinfo",
4371 .data = &ipv6_devconf.accept_ra_pinfo,
4372 .maxlen = sizeof(int),
4373 .mode = 0644,
4374 .proc_handler = proc_dointvec,
4375 },
4376 #ifdef CONFIG_IPV6_ROUTER_PREF
4377 {
4378 .procname = "accept_ra_rtr_pref",
4379 .data = &ipv6_devconf.accept_ra_rtr_pref,
4380 .maxlen = sizeof(int),
4381 .mode = 0644,
4382 .proc_handler = proc_dointvec,
4383 },
4384 {
4385 .procname = "router_probe_interval",
4386 .data = &ipv6_devconf.rtr_probe_interval,
4387 .maxlen = sizeof(int),
4388 .mode = 0644,
4389 .proc_handler = proc_dointvec_jiffies,
4390 },
4391 #ifdef CONFIG_IPV6_ROUTE_INFO
4392 {
4393 .procname = "accept_ra_rt_info_max_plen",
4394 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4395 .maxlen = sizeof(int),
4396 .mode = 0644,
4397 .proc_handler = proc_dointvec,
4398 },
4399 #endif
4400 #endif
4401 {
4402 .procname = "proxy_ndp",
4403 .data = &ipv6_devconf.proxy_ndp,
4404 .maxlen = sizeof(int),
4405 .mode = 0644,
4406 .proc_handler = proc_dointvec,
4407 },
4408 {
4409 .procname = "accept_source_route",
4410 .data = &ipv6_devconf.accept_source_route,
4411 .maxlen = sizeof(int),
4412 .mode = 0644,
4413 .proc_handler = proc_dointvec,
4414 },
4415 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4416 {
4417 .procname = "optimistic_dad",
4418 .data = &ipv6_devconf.optimistic_dad,
4419 .maxlen = sizeof(int),
4420 .mode = 0644,
4421 .proc_handler = proc_dointvec,
4422
4423 },
4424 #endif
4425 #ifdef CONFIG_IPV6_MROUTE
4426 {
4427 .procname = "mc_forwarding",
4428 .data = &ipv6_devconf.mc_forwarding,
4429 .maxlen = sizeof(int),
4430 .mode = 0444,
4431 .proc_handler = proc_dointvec,
4432 },
4433 #endif
4434 {
4435 .procname = "disable_ipv6",
4436 .data = &ipv6_devconf.disable_ipv6,
4437 .maxlen = sizeof(int),
4438 .mode = 0644,
4439 .proc_handler = addrconf_sysctl_disable,
4440 },
4441 {
4442 .procname = "accept_dad",
4443 .data = &ipv6_devconf.accept_dad,
4444 .maxlen = sizeof(int),
4445 .mode = 0644,
4446 .proc_handler = proc_dointvec,
4447 },
4448 {
4449 .procname = "force_tllao",
4450 .data = &ipv6_devconf.force_tllao,
4451 .maxlen = sizeof(int),
4452 .mode = 0644,
4453 .proc_handler = proc_dointvec
4454 },
4455 {
4456 /* sentinel */
4457 }
4458 },
4459 };
4460
4461 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4462 struct inet6_dev *idev, struct ipv6_devconf *p)
4463 {
4464 int i;
4465 struct addrconf_sysctl_table *t;
4466
4467 #define ADDRCONF_CTL_PATH_DEV 3
4468
4469 struct ctl_path addrconf_ctl_path[] = {
4470 { .procname = "net", },
4471 { .procname = "ipv6", },
4472 { .procname = "conf", },
4473 { /* to be set */ },
4474 { },
4475 };
4476
4477
4478 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4479 if (t == NULL)
4480 goto out;
4481
4482 for (i = 0; t->addrconf_vars[i].data; i++) {
4483 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
4484 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4485 t->addrconf_vars[i].extra2 = net;
4486 }
4487
4488 /*
4489 * Make a copy of dev_name, because '.procname' is regarded as const
4490 * by sysctl and we wouldn't want anyone to change it under our feet
4491 * (see SIOCSIFNAME).
4492 */
4493 t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4494 if (!t->dev_name)
4495 goto free;
4496
4497 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
4498
4499 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
4500 t->addrconf_vars);
4501 if (t->sysctl_header == NULL)
4502 goto free_procname;
4503
4504 p->sysctl = t;
4505 return 0;
4506
4507 free_procname:
4508 kfree(t->dev_name);
4509 free:
4510 kfree(t);
4511 out:
4512 return -ENOBUFS;
4513 }
4514
4515 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4516 {
4517 struct addrconf_sysctl_table *t;
4518
4519 if (p->sysctl == NULL)
4520 return;
4521
4522 t = p->sysctl;
4523 p->sysctl = NULL;
4524 unregister_sysctl_table(t->sysctl_header);
4525 kfree(t->dev_name);
4526 kfree(t);
4527 }
4528
4529 static void addrconf_sysctl_register(struct inet6_dev *idev)
4530 {
4531 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
4532 &ndisc_ifinfo_sysctl_change);
4533 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
4534 idev, &idev->cnf);
4535 }
4536
4537 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
4538 {
4539 __addrconf_sysctl_unregister(&idev->cnf);
4540 neigh_sysctl_unregister(idev->nd_parms);
4541 }
4542
4543
4544 #endif
4545
4546 static int __net_init addrconf_init_net(struct net *net)
4547 {
4548 int err;
4549 struct ipv6_devconf *all, *dflt;
4550
4551 err = -ENOMEM;
4552 all = &ipv6_devconf;
4553 dflt = &ipv6_devconf_dflt;
4554
4555 if (!net_eq(net, &init_net)) {
4556 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4557 if (all == NULL)
4558 goto err_alloc_all;
4559
4560 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4561 if (dflt == NULL)
4562 goto err_alloc_dflt;
4563 } else {
4564 /* these will be inherited by all namespaces */
4565 dflt->autoconf = ipv6_defaults.autoconf;
4566 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
4567 }
4568
4569 net->ipv6.devconf_all = all;
4570 net->ipv6.devconf_dflt = dflt;
4571
4572 #ifdef CONFIG_SYSCTL
4573 err = __addrconf_sysctl_register(net, "all", NULL, all);
4574 if (err < 0)
4575 goto err_reg_all;
4576
4577 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
4578 if (err < 0)
4579 goto err_reg_dflt;
4580 #endif
4581 return 0;
4582
4583 #ifdef CONFIG_SYSCTL
4584 err_reg_dflt:
4585 __addrconf_sysctl_unregister(all);
4586 err_reg_all:
4587 kfree(dflt);
4588 #endif
4589 err_alloc_dflt:
4590 kfree(all);
4591 err_alloc_all:
4592 return err;
4593 }
4594
4595 static void __net_exit addrconf_exit_net(struct net *net)
4596 {
4597 #ifdef CONFIG_SYSCTL
4598 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4599 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4600 #endif
4601 if (!net_eq(net, &init_net)) {
4602 kfree(net->ipv6.devconf_dflt);
4603 kfree(net->ipv6.devconf_all);
4604 }
4605 }
4606
4607 static struct pernet_operations addrconf_ops = {
4608 .init = addrconf_init_net,
4609 .exit = addrconf_exit_net,
4610 };
4611
4612 /*
4613 * Device notifier
4614 */
4615
4616 int register_inet6addr_notifier(struct notifier_block *nb)
4617 {
4618 return atomic_notifier_chain_register(&inet6addr_chain, nb);
4619 }
4620 EXPORT_SYMBOL(register_inet6addr_notifier);
4621
4622 int unregister_inet6addr_notifier(struct notifier_block *nb)
4623 {
4624 return atomic_notifier_chain_unregister(&inet6addr_chain, nb);
4625 }
4626 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4627
4628 /*
4629 * Init / cleanup code
4630 */
4631
4632 int __init addrconf_init(void)
4633 {
4634 int i, err;
4635
4636 err = ipv6_addr_label_init();
4637 if (err < 0) {
4638 printk(KERN_CRIT "IPv6 Addrconf:"
4639 " cannot initialize default policy table: %d.\n", err);
4640 goto out;
4641 }
4642
4643 err = register_pernet_subsys(&addrconf_ops);
4644 if (err < 0)
4645 goto out_addrlabel;
4646
4647 /* The addrconf netdev notifier requires that loopback_dev
4648 * has it's ipv6 private information allocated and setup
4649 * before it can bring up and give link-local addresses
4650 * to other devices which are up.
4651 *
4652 * Unfortunately, loopback_dev is not necessarily the first
4653 * entry in the global dev_base list of net devices. In fact,
4654 * it is likely to be the very last entry on that list.
4655 * So this causes the notifier registry below to try and
4656 * give link-local addresses to all devices besides loopback_dev
4657 * first, then loopback_dev, which cases all the non-loopback_dev
4658 * devices to fail to get a link-local address.
4659 *
4660 * So, as a temporary fix, allocate the ipv6 structure for
4661 * loopback_dev first by hand.
4662 * Longer term, all of the dependencies ipv6 has upon the loopback
4663 * device and it being up should be removed.
4664 */
4665 rtnl_lock();
4666 if (!ipv6_add_dev(init_net.loopback_dev))
4667 err = -ENOMEM;
4668 rtnl_unlock();
4669 if (err)
4670 goto errlo;
4671
4672 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4673 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
4674
4675 register_netdevice_notifier(&ipv6_dev_notf);
4676
4677 addrconf_verify(0);
4678
4679 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4680 if (err < 0)
4681 goto errout;
4682
4683 /* Only the first call to __rtnl_register can fail */
4684 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4685 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4686 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4687 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4688 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4689
4690 ipv6_addr_label_rtnl_register();
4691
4692 return 0;
4693 errout:
4694 unregister_netdevice_notifier(&ipv6_dev_notf);
4695 errlo:
4696 unregister_pernet_subsys(&addrconf_ops);
4697 out_addrlabel:
4698 ipv6_addr_label_cleanup();
4699 out:
4700 return err;
4701 }
4702
4703 void addrconf_cleanup(void)
4704 {
4705 struct net_device *dev;
4706 int i;
4707
4708 unregister_netdevice_notifier(&ipv6_dev_notf);
4709 unregister_pernet_subsys(&addrconf_ops);
4710 ipv6_addr_label_cleanup();
4711
4712 rtnl_lock();
4713
4714 /* clean dev list */
4715 for_each_netdev(&init_net, dev) {
4716 if (__in6_dev_get(dev) == NULL)
4717 continue;
4718 addrconf_ifdown(dev, 1);
4719 }
4720 addrconf_ifdown(init_net.loopback_dev, 2);
4721
4722 /*
4723 * Check hash table.
4724 */
4725 spin_lock_bh(&addrconf_hash_lock);
4726 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4727 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
4728 spin_unlock_bh(&addrconf_hash_lock);
4729
4730 del_timer(&addr_chk_timer);
4731 rtnl_unlock();
4732 }
x86 "subsystem" repository