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Merge branch 'topic/misc' into for-linus
[deliverable/linux.git] / net / ipv6 / addrconf.c
1 /*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 */
14
15 /*
16 * Changes:
17 *
18 * Janos Farkas : delete timer on ifdown
19 * <chexum@bankinf.banki.hu>
20 * Andi Kleen : kill double kfree on module
21 * unload.
22 * Maciej W. Rozycki : FDDI support
23 * sekiya@USAGI : Don't send too many RS
24 * packets.
25 * yoshfuji@USAGI : Fixed interval between DAD
26 * packets.
27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
28 * address validation timer.
29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
30 * support.
31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
32 * address on a same interface.
33 * YOSHIFUJI Hideaki @USAGI : ARCnet support
34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
35 * seq_file.
36 * YOSHIFUJI Hideaki @USAGI : improved source address
37 * selection; consider scope,
38 * status etc.
39 */
40
41 #include <linux/errno.h>
42 #include <linux/types.h>
43 #include <linux/kernel.h>
44 #include <linux/socket.h>
45 #include <linux/sockios.h>
46 #include <linux/net.h>
47 #include <linux/in6.h>
48 #include <linux/netdevice.h>
49 #include <linux/if_addr.h>
50 #include <linux/if_arp.h>
51 #include <linux/if_arcnet.h>
52 #include <linux/if_infiniband.h>
53 #include <linux/route.h>
54 #include <linux/inetdevice.h>
55 #include <linux/init.h>
56 #include <linux/slab.h>
57 #ifdef CONFIG_SYSCTL
58 #include <linux/sysctl.h>
59 #endif
60 #include <linux/capability.h>
61 #include <linux/delay.h>
62 #include <linux/notifier.h>
63 #include <linux/string.h>
64
65 #include <net/net_namespace.h>
66 #include <net/sock.h>
67 #include <net/snmp.h>
68
69 #include <net/ipv6.h>
70 #include <net/protocol.h>
71 #include <net/ndisc.h>
72 #include <net/ip6_route.h>
73 #include <net/addrconf.h>
74 #include <net/tcp.h>
75 #include <net/ip.h>
76 #include <net/netlink.h>
77 #include <net/pkt_sched.h>
78 #include <linux/if_tunnel.h>
79 #include <linux/rtnetlink.h>
80
81 #ifdef CONFIG_IPV6_PRIVACY
82 #include <linux/random.h>
83 #endif
84
85 #include <linux/uaccess.h>
86 #include <asm/unaligned.h>
87
88 #include <linux/proc_fs.h>
89 #include <linux/seq_file.h>
90
91 /* Set to 3 to get tracing... */
92 #define ACONF_DEBUG 2
93
94 #if ACONF_DEBUG >= 3
95 #define ADBG(x) printk x
96 #else
97 #define ADBG(x)
98 #endif
99
100 #define INFINITY_LIFE_TIME 0xFFFFFFFF
101
102 static inline u32 cstamp_delta(unsigned long cstamp)
103 {
104 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
105 }
106
107 #define ADDRCONF_TIMER_FUZZ_MINUS (HZ > 50 ? HZ/50 : 1)
108 #define ADDRCONF_TIMER_FUZZ (HZ / 4)
109 #define ADDRCONF_TIMER_FUZZ_MAX (HZ)
110
111 #ifdef CONFIG_SYSCTL
112 static void addrconf_sysctl_register(struct inet6_dev *idev);
113 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
114 #else
115 static inline void addrconf_sysctl_register(struct inet6_dev *idev)
116 {
117 }
118
119 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
120 {
121 }
122 #endif
123
124 #ifdef CONFIG_IPV6_PRIVACY
125 static int __ipv6_regen_rndid(struct inet6_dev *idev);
126 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
127 static void ipv6_regen_rndid(unsigned long data);
128 #endif
129
130 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
131 static int ipv6_count_addresses(struct inet6_dev *idev);
132
133 /*
134 * Configured unicast address hash table
135 */
136 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
137 static DEFINE_SPINLOCK(addrconf_hash_lock);
138
139 static void addrconf_verify(unsigned long);
140
141 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
142 static DEFINE_SPINLOCK(addrconf_verify_lock);
143
144 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
145 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
146
147 static void addrconf_type_change(struct net_device *dev,
148 unsigned long event);
149 static int addrconf_ifdown(struct net_device *dev, int how);
150
151 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
152 static void addrconf_dad_timer(unsigned long data);
153 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
154 static void addrconf_dad_run(struct inet6_dev *idev);
155 static void addrconf_rs_timer(unsigned long data);
156 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
157 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
158
159 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
160 struct prefix_info *pinfo);
161 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
162 struct net_device *dev);
163
164 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
165
166 static struct ipv6_devconf ipv6_devconf __read_mostly = {
167 .forwarding = 0,
168 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
169 .mtu6 = IPV6_MIN_MTU,
170 .accept_ra = 1,
171 .accept_redirects = 1,
172 .autoconf = 1,
173 .force_mld_version = 0,
174 .dad_transmits = 1,
175 .rtr_solicits = MAX_RTR_SOLICITATIONS,
176 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
177 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
178 #ifdef CONFIG_IPV6_PRIVACY
179 .use_tempaddr = 0,
180 .temp_valid_lft = TEMP_VALID_LIFETIME,
181 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
182 .regen_max_retry = REGEN_MAX_RETRY,
183 .max_desync_factor = MAX_DESYNC_FACTOR,
184 #endif
185 .max_addresses = IPV6_MAX_ADDRESSES,
186 .accept_ra_defrtr = 1,
187 .accept_ra_pinfo = 1,
188 #ifdef CONFIG_IPV6_ROUTER_PREF
189 .accept_ra_rtr_pref = 1,
190 .rtr_probe_interval = 60 * HZ,
191 #ifdef CONFIG_IPV6_ROUTE_INFO
192 .accept_ra_rt_info_max_plen = 0,
193 #endif
194 #endif
195 .proxy_ndp = 0,
196 .accept_source_route = 0, /* we do not accept RH0 by default. */
197 .disable_ipv6 = 0,
198 .accept_dad = 1,
199 };
200
201 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
202 .forwarding = 0,
203 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
204 .mtu6 = IPV6_MIN_MTU,
205 .accept_ra = 1,
206 .accept_redirects = 1,
207 .autoconf = 1,
208 .dad_transmits = 1,
209 .rtr_solicits = MAX_RTR_SOLICITATIONS,
210 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
211 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
212 #ifdef CONFIG_IPV6_PRIVACY
213 .use_tempaddr = 0,
214 .temp_valid_lft = TEMP_VALID_LIFETIME,
215 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
216 .regen_max_retry = REGEN_MAX_RETRY,
217 .max_desync_factor = MAX_DESYNC_FACTOR,
218 #endif
219 .max_addresses = IPV6_MAX_ADDRESSES,
220 .accept_ra_defrtr = 1,
221 .accept_ra_pinfo = 1,
222 #ifdef CONFIG_IPV6_ROUTER_PREF
223 .accept_ra_rtr_pref = 1,
224 .rtr_probe_interval = 60 * HZ,
225 #ifdef CONFIG_IPV6_ROUTE_INFO
226 .accept_ra_rt_info_max_plen = 0,
227 #endif
228 #endif
229 .proxy_ndp = 0,
230 .accept_source_route = 0, /* we do not accept RH0 by default. */
231 .disable_ipv6 = 0,
232 .accept_dad = 1,
233 };
234
235 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
236 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
237 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
238 const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
239 const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
240
241 /* Check if a valid qdisc is available */
242 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
243 {
244 return !qdisc_tx_is_noop(dev);
245 }
246
247 /* Check if a route is valid prefix route */
248 static inline int addrconf_is_prefix_route(const struct rt6_info *rt)
249 {
250 return (rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0;
251 }
252
253 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
254 {
255 if (del_timer(&ifp->timer))
256 __in6_ifa_put(ifp);
257 }
258
259 enum addrconf_timer_t {
260 AC_NONE,
261 AC_DAD,
262 AC_RS,
263 };
264
265 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
266 enum addrconf_timer_t what,
267 unsigned long when)
268 {
269 if (!del_timer(&ifp->timer))
270 in6_ifa_hold(ifp);
271
272 switch (what) {
273 case AC_DAD:
274 ifp->timer.function = addrconf_dad_timer;
275 break;
276 case AC_RS:
277 ifp->timer.function = addrconf_rs_timer;
278 break;
279 default:
280 break;
281 }
282 ifp->timer.expires = jiffies + when;
283 add_timer(&ifp->timer);
284 }
285
286 static int snmp6_alloc_dev(struct inet6_dev *idev)
287 {
288 if (snmp_mib_init((void __percpu **)idev->stats.ipv6,
289 sizeof(struct ipstats_mib),
290 __alignof__(struct ipstats_mib)) < 0)
291 goto err_ip;
292 if (snmp_mib_init((void __percpu **)idev->stats.icmpv6,
293 sizeof(struct icmpv6_mib),
294 __alignof__(struct icmpv6_mib)) < 0)
295 goto err_icmp;
296 if (snmp_mib_init((void __percpu **)idev->stats.icmpv6msg,
297 sizeof(struct icmpv6msg_mib),
298 __alignof__(struct icmpv6msg_mib)) < 0)
299 goto err_icmpmsg;
300
301 return 0;
302
303 err_icmpmsg:
304 snmp_mib_free((void __percpu **)idev->stats.icmpv6);
305 err_icmp:
306 snmp_mib_free((void __percpu **)idev->stats.ipv6);
307 err_ip:
308 return -ENOMEM;
309 }
310
311 static void snmp6_free_dev(struct inet6_dev *idev)
312 {
313 snmp_mib_free((void __percpu **)idev->stats.icmpv6msg);
314 snmp_mib_free((void __percpu **)idev->stats.icmpv6);
315 snmp_mib_free((void __percpu **)idev->stats.ipv6);
316 }
317
318 /* Nobody refers to this device, we may destroy it. */
319
320 static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
321 {
322 struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
323 kfree(idev);
324 }
325
326 void in6_dev_finish_destroy(struct inet6_dev *idev)
327 {
328 struct net_device *dev = idev->dev;
329
330 WARN_ON(!list_empty(&idev->addr_list));
331 WARN_ON(idev->mc_list != NULL);
332
333 #ifdef NET_REFCNT_DEBUG
334 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
335 #endif
336 dev_put(dev);
337 if (!idev->dead) {
338 pr_warning("Freeing alive inet6 device %p\n", idev);
339 return;
340 }
341 snmp6_free_dev(idev);
342 call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
343 }
344
345 EXPORT_SYMBOL(in6_dev_finish_destroy);
346
347 static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
348 {
349 struct inet6_dev *ndev;
350
351 ASSERT_RTNL();
352
353 if (dev->mtu < IPV6_MIN_MTU)
354 return NULL;
355
356 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
357
358 if (ndev == NULL)
359 return NULL;
360
361 rwlock_init(&ndev->lock);
362 ndev->dev = dev;
363 INIT_LIST_HEAD(&ndev->addr_list);
364
365 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
366 ndev->cnf.mtu6 = dev->mtu;
367 ndev->cnf.sysctl = NULL;
368 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
369 if (ndev->nd_parms == NULL) {
370 kfree(ndev);
371 return NULL;
372 }
373 if (ndev->cnf.forwarding)
374 dev_disable_lro(dev);
375 /* We refer to the device */
376 dev_hold(dev);
377
378 if (snmp6_alloc_dev(ndev) < 0) {
379 ADBG((KERN_WARNING
380 "%s(): cannot allocate memory for statistics; dev=%s.\n",
381 __func__, dev->name));
382 neigh_parms_release(&nd_tbl, ndev->nd_parms);
383 ndev->dead = 1;
384 in6_dev_finish_destroy(ndev);
385 return NULL;
386 }
387
388 if (snmp6_register_dev(ndev) < 0) {
389 ADBG((KERN_WARNING
390 "%s(): cannot create /proc/net/dev_snmp6/%s\n",
391 __func__, dev->name));
392 neigh_parms_release(&nd_tbl, ndev->nd_parms);
393 ndev->dead = 1;
394 in6_dev_finish_destroy(ndev);
395 return NULL;
396 }
397
398 /* One reference from device. We must do this before
399 * we invoke __ipv6_regen_rndid().
400 */
401 in6_dev_hold(ndev);
402
403 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
404 ndev->cnf.accept_dad = -1;
405
406 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
407 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
408 printk(KERN_INFO
409 "%s: Disabled Multicast RS\n",
410 dev->name);
411 ndev->cnf.rtr_solicits = 0;
412 }
413 #endif
414
415 #ifdef CONFIG_IPV6_PRIVACY
416 INIT_LIST_HEAD(&ndev->tempaddr_list);
417 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
418 if ((dev->flags&IFF_LOOPBACK) ||
419 dev->type == ARPHRD_TUNNEL ||
420 dev->type == ARPHRD_TUNNEL6 ||
421 dev->type == ARPHRD_SIT ||
422 dev->type == ARPHRD_NONE) {
423 ndev->cnf.use_tempaddr = -1;
424 } else {
425 in6_dev_hold(ndev);
426 ipv6_regen_rndid((unsigned long) ndev);
427 }
428 #endif
429
430 if (netif_running(dev) && addrconf_qdisc_ok(dev))
431 ndev->if_flags |= IF_READY;
432
433 ipv6_mc_init_dev(ndev);
434 ndev->tstamp = jiffies;
435 addrconf_sysctl_register(ndev);
436 /* protected by rtnl_lock */
437 rcu_assign_pointer(dev->ip6_ptr, ndev);
438
439 /* Join all-node multicast group */
440 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
441
442 return ndev;
443 }
444
445 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
446 {
447 struct inet6_dev *idev;
448
449 ASSERT_RTNL();
450
451 idev = __in6_dev_get(dev);
452 if (!idev) {
453 idev = ipv6_add_dev(dev);
454 if (!idev)
455 return NULL;
456 }
457
458 if (dev->flags&IFF_UP)
459 ipv6_mc_up(idev);
460 return idev;
461 }
462
463 #ifdef CONFIG_SYSCTL
464 static void dev_forward_change(struct inet6_dev *idev)
465 {
466 struct net_device *dev;
467 struct inet6_ifaddr *ifa;
468
469 if (!idev)
470 return;
471 dev = idev->dev;
472 if (idev->cnf.forwarding)
473 dev_disable_lro(dev);
474 if (dev && (dev->flags & IFF_MULTICAST)) {
475 if (idev->cnf.forwarding)
476 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
477 else
478 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
479 }
480
481 list_for_each_entry(ifa, &idev->addr_list, if_list) {
482 if (ifa->flags&IFA_F_TENTATIVE)
483 continue;
484 if (idev->cnf.forwarding)
485 addrconf_join_anycast(ifa);
486 else
487 addrconf_leave_anycast(ifa);
488 }
489 }
490
491
492 static void addrconf_forward_change(struct net *net, __s32 newf)
493 {
494 struct net_device *dev;
495 struct inet6_dev *idev;
496
497 rcu_read_lock();
498 for_each_netdev_rcu(net, dev) {
499 idev = __in6_dev_get(dev);
500 if (idev) {
501 int changed = (!idev->cnf.forwarding) ^ (!newf);
502 idev->cnf.forwarding = newf;
503 if (changed)
504 dev_forward_change(idev);
505 }
506 }
507 rcu_read_unlock();
508 }
509
510 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old)
511 {
512 struct net *net;
513
514 net = (struct net *)table->extra2;
515 if (p == &net->ipv6.devconf_dflt->forwarding)
516 return 0;
517
518 if (!rtnl_trylock()) {
519 /* Restore the original values before restarting */
520 *p = old;
521 return restart_syscall();
522 }
523
524 if (p == &net->ipv6.devconf_all->forwarding) {
525 __s32 newf = net->ipv6.devconf_all->forwarding;
526 net->ipv6.devconf_dflt->forwarding = newf;
527 addrconf_forward_change(net, newf);
528 } else if ((!*p) ^ (!old))
529 dev_forward_change((struct inet6_dev *)table->extra1);
530 rtnl_unlock();
531
532 if (*p)
533 rt6_purge_dflt_routers(net);
534 return 1;
535 }
536 #endif
537
538 static void inet6_ifa_finish_destroy_rcu(struct rcu_head *head)
539 {
540 struct inet6_ifaddr *ifp = container_of(head, struct inet6_ifaddr, rcu);
541 kfree(ifp);
542 }
543
544 /* Nobody refers to this ifaddr, destroy it */
545 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
546 {
547 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
548
549 #ifdef NET_REFCNT_DEBUG
550 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
551 #endif
552
553 in6_dev_put(ifp->idev);
554
555 if (del_timer(&ifp->timer))
556 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp);
557
558 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
559 pr_warning("Freeing alive inet6 address %p\n", ifp);
560 return;
561 }
562 dst_release(&ifp->rt->dst);
563
564 call_rcu(&ifp->rcu, inet6_ifa_finish_destroy_rcu);
565 }
566
567 static void
568 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
569 {
570 struct list_head *p;
571 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
572
573 /*
574 * Each device address list is sorted in order of scope -
575 * global before linklocal.
576 */
577 list_for_each(p, &idev->addr_list) {
578 struct inet6_ifaddr *ifa
579 = list_entry(p, struct inet6_ifaddr, if_list);
580 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
581 break;
582 }
583
584 list_add_tail(&ifp->if_list, p);
585 }
586
587 static u32 ipv6_addr_hash(const struct in6_addr *addr)
588 {
589 /*
590 * We perform the hash function over the last 64 bits of the address
591 * This will include the IEEE address token on links that support it.
592 */
593 return jhash_2words((__force u32)addr->s6_addr32[2],
594 (__force u32)addr->s6_addr32[3], 0)
595 & (IN6_ADDR_HSIZE - 1);
596 }
597
598 /* On success it returns ifp with increased reference count */
599
600 static struct inet6_ifaddr *
601 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
602 int scope, u32 flags)
603 {
604 struct inet6_ifaddr *ifa = NULL;
605 struct rt6_info *rt;
606 unsigned int hash;
607 int err = 0;
608 int addr_type = ipv6_addr_type(addr);
609
610 if (addr_type == IPV6_ADDR_ANY ||
611 addr_type & IPV6_ADDR_MULTICAST ||
612 (!(idev->dev->flags & IFF_LOOPBACK) &&
613 addr_type & IPV6_ADDR_LOOPBACK))
614 return ERR_PTR(-EADDRNOTAVAIL);
615
616 rcu_read_lock_bh();
617 if (idev->dead) {
618 err = -ENODEV; /*XXX*/
619 goto out2;
620 }
621
622 if (idev->cnf.disable_ipv6) {
623 err = -EACCES;
624 goto out2;
625 }
626
627 spin_lock(&addrconf_hash_lock);
628
629 /* Ignore adding duplicate addresses on an interface */
630 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
631 ADBG(("ipv6_add_addr: already assigned\n"));
632 err = -EEXIST;
633 goto out;
634 }
635
636 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
637
638 if (ifa == NULL) {
639 ADBG(("ipv6_add_addr: malloc failed\n"));
640 err = -ENOBUFS;
641 goto out;
642 }
643
644 rt = addrconf_dst_alloc(idev, addr, 0);
645 if (IS_ERR(rt)) {
646 err = PTR_ERR(rt);
647 goto out;
648 }
649
650 ipv6_addr_copy(&ifa->addr, addr);
651
652 spin_lock_init(&ifa->lock);
653 spin_lock_init(&ifa->state_lock);
654 init_timer(&ifa->timer);
655 INIT_HLIST_NODE(&ifa->addr_lst);
656 ifa->timer.data = (unsigned long) ifa;
657 ifa->scope = scope;
658 ifa->prefix_len = pfxlen;
659 ifa->flags = flags | IFA_F_TENTATIVE;
660 ifa->cstamp = ifa->tstamp = jiffies;
661
662 ifa->rt = rt;
663
664 /*
665 * part one of RFC 4429, section 3.3
666 * We should not configure an address as
667 * optimistic if we do not yet know the link
668 * layer address of our nexhop router
669 */
670
671 if (rt->rt6i_nexthop == NULL)
672 ifa->flags &= ~IFA_F_OPTIMISTIC;
673
674 ifa->idev = idev;
675 in6_dev_hold(idev);
676 /* For caller */
677 in6_ifa_hold(ifa);
678
679 /* Add to big hash table */
680 hash = ipv6_addr_hash(addr);
681
682 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
683 spin_unlock(&addrconf_hash_lock);
684
685 write_lock(&idev->lock);
686 /* Add to inet6_dev unicast addr list. */
687 ipv6_link_dev_addr(idev, ifa);
688
689 #ifdef CONFIG_IPV6_PRIVACY
690 if (ifa->flags&IFA_F_TEMPORARY) {
691 list_add(&ifa->tmp_list, &idev->tempaddr_list);
692 in6_ifa_hold(ifa);
693 }
694 #endif
695
696 in6_ifa_hold(ifa);
697 write_unlock(&idev->lock);
698 out2:
699 rcu_read_unlock_bh();
700
701 if (likely(err == 0))
702 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
703 else {
704 kfree(ifa);
705 ifa = ERR_PTR(err);
706 }
707
708 return ifa;
709 out:
710 spin_unlock(&addrconf_hash_lock);
711 goto out2;
712 }
713
714 /* This function wants to get referenced ifp and releases it before return */
715
716 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
717 {
718 struct inet6_ifaddr *ifa, *ifn;
719 struct inet6_dev *idev = ifp->idev;
720 int state;
721 int hash;
722 int deleted = 0, onlink = 0;
723 unsigned long expires = jiffies;
724
725 hash = ipv6_addr_hash(&ifp->addr);
726
727 spin_lock_bh(&ifp->state_lock);
728 state = ifp->state;
729 ifp->state = INET6_IFADDR_STATE_DEAD;
730 spin_unlock_bh(&ifp->state_lock);
731
732 if (state == INET6_IFADDR_STATE_DEAD)
733 goto out;
734
735 spin_lock_bh(&addrconf_hash_lock);
736 hlist_del_init_rcu(&ifp->addr_lst);
737 spin_unlock_bh(&addrconf_hash_lock);
738
739 write_lock_bh(&idev->lock);
740 #ifdef CONFIG_IPV6_PRIVACY
741 if (ifp->flags&IFA_F_TEMPORARY) {
742 list_del(&ifp->tmp_list);
743 if (ifp->ifpub) {
744 in6_ifa_put(ifp->ifpub);
745 ifp->ifpub = NULL;
746 }
747 __in6_ifa_put(ifp);
748 }
749 #endif
750
751 list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) {
752 if (ifa == ifp) {
753 list_del_init(&ifp->if_list);
754 __in6_ifa_put(ifp);
755
756 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
757 break;
758 deleted = 1;
759 continue;
760 } else if (ifp->flags & IFA_F_PERMANENT) {
761 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
762 ifp->prefix_len)) {
763 if (ifa->flags & IFA_F_PERMANENT) {
764 onlink = 1;
765 if (deleted)
766 break;
767 } else {
768 unsigned long lifetime;
769
770 if (!onlink)
771 onlink = -1;
772
773 spin_lock(&ifa->lock);
774
775 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
776 /*
777 * Note: Because this address is
778 * not permanent, lifetime <
779 * LONG_MAX / HZ here.
780 */
781 if (time_before(expires,
782 ifa->tstamp + lifetime * HZ))
783 expires = ifa->tstamp + lifetime * HZ;
784 spin_unlock(&ifa->lock);
785 }
786 }
787 }
788 }
789 write_unlock_bh(&idev->lock);
790
791 addrconf_del_timer(ifp);
792
793 ipv6_ifa_notify(RTM_DELADDR, ifp);
794
795 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
796
797 /*
798 * Purge or update corresponding prefix
799 *
800 * 1) we don't purge prefix here if address was not permanent.
801 * prefix is managed by its own lifetime.
802 * 2) if there're no addresses, delete prefix.
803 * 3) if there're still other permanent address(es),
804 * corresponding prefix is still permanent.
805 * 4) otherwise, update prefix lifetime to the
806 * longest valid lifetime among the corresponding
807 * addresses on the device.
808 * Note: subsequent RA will update lifetime.
809 *
810 * --yoshfuji
811 */
812 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
813 struct in6_addr prefix;
814 struct rt6_info *rt;
815 struct net *net = dev_net(ifp->idev->dev);
816 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
817 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1);
818
819 if (rt && addrconf_is_prefix_route(rt)) {
820 if (onlink == 0) {
821 ip6_del_rt(rt);
822 rt = NULL;
823 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
824 rt->rt6i_expires = expires;
825 rt->rt6i_flags |= RTF_EXPIRES;
826 }
827 }
828 dst_release(&rt->dst);
829 }
830
831 out:
832 in6_ifa_put(ifp);
833 }
834
835 #ifdef CONFIG_IPV6_PRIVACY
836 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
837 {
838 struct inet6_dev *idev = ifp->idev;
839 struct in6_addr addr, *tmpaddr;
840 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp, age;
841 unsigned long regen_advance;
842 int tmp_plen;
843 int ret = 0;
844 int max_addresses;
845 u32 addr_flags;
846
847 write_lock(&idev->lock);
848 if (ift) {
849 spin_lock_bh(&ift->lock);
850 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
851 spin_unlock_bh(&ift->lock);
852 tmpaddr = &addr;
853 } else {
854 tmpaddr = NULL;
855 }
856 retry:
857 in6_dev_hold(idev);
858 if (idev->cnf.use_tempaddr <= 0) {
859 write_unlock(&idev->lock);
860 printk(KERN_INFO
861 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
862 in6_dev_put(idev);
863 ret = -1;
864 goto out;
865 }
866 spin_lock_bh(&ifp->lock);
867 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
868 idev->cnf.use_tempaddr = -1; /*XXX*/
869 spin_unlock_bh(&ifp->lock);
870 write_unlock(&idev->lock);
871 printk(KERN_WARNING
872 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
873 in6_dev_put(idev);
874 ret = -1;
875 goto out;
876 }
877 in6_ifa_hold(ifp);
878 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
879 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
880 spin_unlock_bh(&ifp->lock);
881 write_unlock(&idev->lock);
882 printk(KERN_WARNING
883 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
884 in6_ifa_put(ifp);
885 in6_dev_put(idev);
886 ret = -1;
887 goto out;
888 }
889 memcpy(&addr.s6_addr[8], idev->rndid, 8);
890 age = (jiffies - ifp->tstamp) / HZ;
891 tmp_valid_lft = min_t(__u32,
892 ifp->valid_lft,
893 idev->cnf.temp_valid_lft + age);
894 tmp_prefered_lft = min_t(__u32,
895 ifp->prefered_lft,
896 idev->cnf.temp_prefered_lft + age -
897 idev->cnf.max_desync_factor);
898 tmp_plen = ifp->prefix_len;
899 max_addresses = idev->cnf.max_addresses;
900 tmp_cstamp = ifp->cstamp;
901 tmp_tstamp = ifp->tstamp;
902 spin_unlock_bh(&ifp->lock);
903
904 regen_advance = idev->cnf.regen_max_retry *
905 idev->cnf.dad_transmits *
906 idev->nd_parms->retrans_time / HZ;
907 write_unlock(&idev->lock);
908
909 /* A temporary address is created only if this calculated Preferred
910 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
911 * an implementation must not create a temporary address with a zero
912 * Preferred Lifetime.
913 */
914 if (tmp_prefered_lft <= regen_advance) {
915 in6_ifa_put(ifp);
916 in6_dev_put(idev);
917 ret = -1;
918 goto out;
919 }
920
921 addr_flags = IFA_F_TEMPORARY;
922 /* set in addrconf_prefix_rcv() */
923 if (ifp->flags & IFA_F_OPTIMISTIC)
924 addr_flags |= IFA_F_OPTIMISTIC;
925
926 ift = !max_addresses ||
927 ipv6_count_addresses(idev) < max_addresses ?
928 ipv6_add_addr(idev, &addr, tmp_plen,
929 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
930 addr_flags) : NULL;
931 if (!ift || IS_ERR(ift)) {
932 in6_ifa_put(ifp);
933 in6_dev_put(idev);
934 printk(KERN_INFO
935 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
936 tmpaddr = &addr;
937 write_lock(&idev->lock);
938 goto retry;
939 }
940
941 spin_lock_bh(&ift->lock);
942 ift->ifpub = ifp;
943 ift->valid_lft = tmp_valid_lft;
944 ift->prefered_lft = tmp_prefered_lft;
945 ift->cstamp = tmp_cstamp;
946 ift->tstamp = tmp_tstamp;
947 spin_unlock_bh(&ift->lock);
948
949 addrconf_dad_start(ift, 0);
950 in6_ifa_put(ift);
951 in6_dev_put(idev);
952 out:
953 return ret;
954 }
955 #endif
956
957 /*
958 * Choose an appropriate source address (RFC3484)
959 */
960 enum {
961 IPV6_SADDR_RULE_INIT = 0,
962 IPV6_SADDR_RULE_LOCAL,
963 IPV6_SADDR_RULE_SCOPE,
964 IPV6_SADDR_RULE_PREFERRED,
965 #ifdef CONFIG_IPV6_MIP6
966 IPV6_SADDR_RULE_HOA,
967 #endif
968 IPV6_SADDR_RULE_OIF,
969 IPV6_SADDR_RULE_LABEL,
970 #ifdef CONFIG_IPV6_PRIVACY
971 IPV6_SADDR_RULE_PRIVACY,
972 #endif
973 IPV6_SADDR_RULE_ORCHID,
974 IPV6_SADDR_RULE_PREFIX,
975 IPV6_SADDR_RULE_MAX
976 };
977
978 struct ipv6_saddr_score {
979 int rule;
980 int addr_type;
981 struct inet6_ifaddr *ifa;
982 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
983 int scopedist;
984 int matchlen;
985 };
986
987 struct ipv6_saddr_dst {
988 const struct in6_addr *addr;
989 int ifindex;
990 int scope;
991 int label;
992 unsigned int prefs;
993 };
994
995 static inline int ipv6_saddr_preferred(int type)
996 {
997 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
998 return 1;
999 return 0;
1000 }
1001
1002 static int ipv6_get_saddr_eval(struct net *net,
1003 struct ipv6_saddr_score *score,
1004 struct ipv6_saddr_dst *dst,
1005 int i)
1006 {
1007 int ret;
1008
1009 if (i <= score->rule) {
1010 switch (i) {
1011 case IPV6_SADDR_RULE_SCOPE:
1012 ret = score->scopedist;
1013 break;
1014 case IPV6_SADDR_RULE_PREFIX:
1015 ret = score->matchlen;
1016 break;
1017 default:
1018 ret = !!test_bit(i, score->scorebits);
1019 }
1020 goto out;
1021 }
1022
1023 switch (i) {
1024 case IPV6_SADDR_RULE_INIT:
1025 /* Rule 0: remember if hiscore is not ready yet */
1026 ret = !!score->ifa;
1027 break;
1028 case IPV6_SADDR_RULE_LOCAL:
1029 /* Rule 1: Prefer same address */
1030 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1031 break;
1032 case IPV6_SADDR_RULE_SCOPE:
1033 /* Rule 2: Prefer appropriate scope
1034 *
1035 * ret
1036 * ^
1037 * -1 | d 15
1038 * ---+--+-+---> scope
1039 * |
1040 * | d is scope of the destination.
1041 * B-d | \
1042 * | \ <- smaller scope is better if
1043 * B-15 | \ if scope is enough for destinaion.
1044 * | ret = B - scope (-1 <= scope >= d <= 15).
1045 * d-C-1 | /
1046 * |/ <- greater is better
1047 * -C / if scope is not enough for destination.
1048 * /| ret = scope - C (-1 <= d < scope <= 15).
1049 *
1050 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1051 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1052 * Assume B = 0 and we get C > 29.
1053 */
1054 ret = __ipv6_addr_src_scope(score->addr_type);
1055 if (ret >= dst->scope)
1056 ret = -ret;
1057 else
1058 ret -= 128; /* 30 is enough */
1059 score->scopedist = ret;
1060 break;
1061 case IPV6_SADDR_RULE_PREFERRED:
1062 /* Rule 3: Avoid deprecated and optimistic addresses */
1063 ret = ipv6_saddr_preferred(score->addr_type) ||
1064 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1065 break;
1066 #ifdef CONFIG_IPV6_MIP6
1067 case IPV6_SADDR_RULE_HOA:
1068 {
1069 /* Rule 4: Prefer home address */
1070 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1071 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1072 break;
1073 }
1074 #endif
1075 case IPV6_SADDR_RULE_OIF:
1076 /* Rule 5: Prefer outgoing interface */
1077 ret = (!dst->ifindex ||
1078 dst->ifindex == score->ifa->idev->dev->ifindex);
1079 break;
1080 case IPV6_SADDR_RULE_LABEL:
1081 /* Rule 6: Prefer matching label */
1082 ret = ipv6_addr_label(net,
1083 &score->ifa->addr, score->addr_type,
1084 score->ifa->idev->dev->ifindex) == dst->label;
1085 break;
1086 #ifdef CONFIG_IPV6_PRIVACY
1087 case IPV6_SADDR_RULE_PRIVACY:
1088 {
1089 /* Rule 7: Prefer public address
1090 * Note: prefer temprary address if use_tempaddr >= 2
1091 */
1092 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1093 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1094 score->ifa->idev->cnf.use_tempaddr >= 2;
1095 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1096 break;
1097 }
1098 #endif
1099 case IPV6_SADDR_RULE_ORCHID:
1100 /* Rule 8-: Prefer ORCHID vs ORCHID or
1101 * non-ORCHID vs non-ORCHID
1102 */
1103 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1104 ipv6_addr_orchid(dst->addr));
1105 break;
1106 case IPV6_SADDR_RULE_PREFIX:
1107 /* Rule 8: Use longest matching prefix */
1108 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr,
1109 dst->addr);
1110 break;
1111 default:
1112 ret = 0;
1113 }
1114
1115 if (ret)
1116 __set_bit(i, score->scorebits);
1117 score->rule = i;
1118 out:
1119 return ret;
1120 }
1121
1122 int ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev,
1123 const struct in6_addr *daddr, unsigned int prefs,
1124 struct in6_addr *saddr)
1125 {
1126 struct ipv6_saddr_score scores[2],
1127 *score = &scores[0], *hiscore = &scores[1];
1128 struct ipv6_saddr_dst dst;
1129 struct net_device *dev;
1130 int dst_type;
1131
1132 dst_type = __ipv6_addr_type(daddr);
1133 dst.addr = daddr;
1134 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1135 dst.scope = __ipv6_addr_src_scope(dst_type);
1136 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1137 dst.prefs = prefs;
1138
1139 hiscore->rule = -1;
1140 hiscore->ifa = NULL;
1141
1142 rcu_read_lock();
1143
1144 for_each_netdev_rcu(net, dev) {
1145 struct inet6_dev *idev;
1146
1147 /* Candidate Source Address (section 4)
1148 * - multicast and link-local destination address,
1149 * the set of candidate source address MUST only
1150 * include addresses assigned to interfaces
1151 * belonging to the same link as the outgoing
1152 * interface.
1153 * (- For site-local destination addresses, the
1154 * set of candidate source addresses MUST only
1155 * include addresses assigned to interfaces
1156 * belonging to the same site as the outgoing
1157 * interface.)
1158 */
1159 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1160 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1161 dst.ifindex && dev->ifindex != dst.ifindex)
1162 continue;
1163
1164 idev = __in6_dev_get(dev);
1165 if (!idev)
1166 continue;
1167
1168 read_lock_bh(&idev->lock);
1169 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1170 int i;
1171
1172 /*
1173 * - Tentative Address (RFC2462 section 5.4)
1174 * - A tentative address is not considered
1175 * "assigned to an interface" in the traditional
1176 * sense, unless it is also flagged as optimistic.
1177 * - Candidate Source Address (section 4)
1178 * - In any case, anycast addresses, multicast
1179 * addresses, and the unspecified address MUST
1180 * NOT be included in a candidate set.
1181 */
1182 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1183 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1184 continue;
1185
1186 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1187
1188 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1189 score->addr_type & IPV6_ADDR_MULTICAST)) {
1190 LIMIT_NETDEBUG(KERN_DEBUG
1191 "ADDRCONF: unspecified / multicast address "
1192 "assigned as unicast address on %s",
1193 dev->name);
1194 continue;
1195 }
1196
1197 score->rule = -1;
1198 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1199
1200 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1201 int minihiscore, miniscore;
1202
1203 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1204 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1205
1206 if (minihiscore > miniscore) {
1207 if (i == IPV6_SADDR_RULE_SCOPE &&
1208 score->scopedist > 0) {
1209 /*
1210 * special case:
1211 * each remaining entry
1212 * has too small (not enough)
1213 * scope, because ifa entries
1214 * are sorted by their scope
1215 * values.
1216 */
1217 goto try_nextdev;
1218 }
1219 break;
1220 } else if (minihiscore < miniscore) {
1221 if (hiscore->ifa)
1222 in6_ifa_put(hiscore->ifa);
1223
1224 in6_ifa_hold(score->ifa);
1225
1226 swap(hiscore, score);
1227
1228 /* restore our iterator */
1229 score->ifa = hiscore->ifa;
1230
1231 break;
1232 }
1233 }
1234 }
1235 try_nextdev:
1236 read_unlock_bh(&idev->lock);
1237 }
1238 rcu_read_unlock();
1239
1240 if (!hiscore->ifa)
1241 return -EADDRNOTAVAIL;
1242
1243 ipv6_addr_copy(saddr, &hiscore->ifa->addr);
1244 in6_ifa_put(hiscore->ifa);
1245 return 0;
1246 }
1247 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1248
1249 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1250 unsigned char banned_flags)
1251 {
1252 struct inet6_dev *idev;
1253 int err = -EADDRNOTAVAIL;
1254
1255 rcu_read_lock();
1256 idev = __in6_dev_get(dev);
1257 if (idev) {
1258 struct inet6_ifaddr *ifp;
1259
1260 read_lock_bh(&idev->lock);
1261 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1262 if (ifp->scope == IFA_LINK &&
1263 !(ifp->flags & banned_flags)) {
1264 ipv6_addr_copy(addr, &ifp->addr);
1265 err = 0;
1266 break;
1267 }
1268 }
1269 read_unlock_bh(&idev->lock);
1270 }
1271 rcu_read_unlock();
1272 return err;
1273 }
1274
1275 static int ipv6_count_addresses(struct inet6_dev *idev)
1276 {
1277 int cnt = 0;
1278 struct inet6_ifaddr *ifp;
1279
1280 read_lock_bh(&idev->lock);
1281 list_for_each_entry(ifp, &idev->addr_list, if_list)
1282 cnt++;
1283 read_unlock_bh(&idev->lock);
1284 return cnt;
1285 }
1286
1287 int ipv6_chk_addr(struct net *net, struct in6_addr *addr,
1288 struct net_device *dev, int strict)
1289 {
1290 struct inet6_ifaddr *ifp;
1291 struct hlist_node *node;
1292 unsigned int hash = ipv6_addr_hash(addr);
1293
1294 rcu_read_lock_bh();
1295 hlist_for_each_entry_rcu(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1296 if (!net_eq(dev_net(ifp->idev->dev), net))
1297 continue;
1298 if (ipv6_addr_equal(&ifp->addr, addr) &&
1299 !(ifp->flags&IFA_F_TENTATIVE) &&
1300 (dev == NULL || ifp->idev->dev == dev ||
1301 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1302 rcu_read_unlock_bh();
1303 return 1;
1304 }
1305 }
1306
1307 rcu_read_unlock_bh();
1308 return 0;
1309 }
1310 EXPORT_SYMBOL(ipv6_chk_addr);
1311
1312 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1313 struct net_device *dev)
1314 {
1315 unsigned int hash = ipv6_addr_hash(addr);
1316 struct inet6_ifaddr *ifp;
1317 struct hlist_node *node;
1318
1319 hlist_for_each_entry(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1320 if (!net_eq(dev_net(ifp->idev->dev), net))
1321 continue;
1322 if (ipv6_addr_equal(&ifp->addr, addr)) {
1323 if (dev == NULL || ifp->idev->dev == dev)
1324 return true;
1325 }
1326 }
1327 return false;
1328 }
1329
1330 int ipv6_chk_prefix(struct in6_addr *addr, struct net_device *dev)
1331 {
1332 struct inet6_dev *idev;
1333 struct inet6_ifaddr *ifa;
1334 int onlink;
1335
1336 onlink = 0;
1337 rcu_read_lock();
1338 idev = __in6_dev_get(dev);
1339 if (idev) {
1340 read_lock_bh(&idev->lock);
1341 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1342 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1343 ifa->prefix_len);
1344 if (onlink)
1345 break;
1346 }
1347 read_unlock_bh(&idev->lock);
1348 }
1349 rcu_read_unlock();
1350 return onlink;
1351 }
1352
1353 EXPORT_SYMBOL(ipv6_chk_prefix);
1354
1355 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1356 struct net_device *dev, int strict)
1357 {
1358 struct inet6_ifaddr *ifp, *result = NULL;
1359 unsigned int hash = ipv6_addr_hash(addr);
1360 struct hlist_node *node;
1361
1362 rcu_read_lock_bh();
1363 hlist_for_each_entry_rcu_bh(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1364 if (!net_eq(dev_net(ifp->idev->dev), net))
1365 continue;
1366 if (ipv6_addr_equal(&ifp->addr, addr)) {
1367 if (dev == NULL || ifp->idev->dev == dev ||
1368 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1369 result = ifp;
1370 in6_ifa_hold(ifp);
1371 break;
1372 }
1373 }
1374 }
1375 rcu_read_unlock_bh();
1376
1377 return result;
1378 }
1379
1380 /* Gets referenced address, destroys ifaddr */
1381
1382 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1383 {
1384 if (ifp->flags&IFA_F_PERMANENT) {
1385 spin_lock_bh(&ifp->lock);
1386 addrconf_del_timer(ifp);
1387 ifp->flags |= IFA_F_TENTATIVE;
1388 if (dad_failed)
1389 ifp->flags |= IFA_F_DADFAILED;
1390 spin_unlock_bh(&ifp->lock);
1391 if (dad_failed)
1392 ipv6_ifa_notify(0, ifp);
1393 in6_ifa_put(ifp);
1394 #ifdef CONFIG_IPV6_PRIVACY
1395 } else if (ifp->flags&IFA_F_TEMPORARY) {
1396 struct inet6_ifaddr *ifpub;
1397 spin_lock_bh(&ifp->lock);
1398 ifpub = ifp->ifpub;
1399 if (ifpub) {
1400 in6_ifa_hold(ifpub);
1401 spin_unlock_bh(&ifp->lock);
1402 ipv6_create_tempaddr(ifpub, ifp);
1403 in6_ifa_put(ifpub);
1404 } else {
1405 spin_unlock_bh(&ifp->lock);
1406 }
1407 ipv6_del_addr(ifp);
1408 #endif
1409 } else
1410 ipv6_del_addr(ifp);
1411 }
1412
1413 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1414 {
1415 int err = -ENOENT;
1416
1417 spin_lock(&ifp->state_lock);
1418 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1419 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1420 err = 0;
1421 }
1422 spin_unlock(&ifp->state_lock);
1423
1424 return err;
1425 }
1426
1427 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1428 {
1429 struct inet6_dev *idev = ifp->idev;
1430
1431 if (addrconf_dad_end(ifp)) {
1432 in6_ifa_put(ifp);
1433 return;
1434 }
1435
1436 if (net_ratelimit())
1437 printk(KERN_INFO "%s: IPv6 duplicate address %pI6c detected!\n",
1438 ifp->idev->dev->name, &ifp->addr);
1439
1440 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1441 struct in6_addr addr;
1442
1443 addr.s6_addr32[0] = htonl(0xfe800000);
1444 addr.s6_addr32[1] = 0;
1445
1446 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1447 ipv6_addr_equal(&ifp->addr, &addr)) {
1448 /* DAD failed for link-local based on MAC address */
1449 idev->cnf.disable_ipv6 = 1;
1450
1451 printk(KERN_INFO "%s: IPv6 being disabled!\n",
1452 ifp->idev->dev->name);
1453 }
1454 }
1455
1456 addrconf_dad_stop(ifp, 1);
1457 }
1458
1459 /* Join to solicited addr multicast group. */
1460
1461 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1462 {
1463 struct in6_addr maddr;
1464
1465 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1466 return;
1467
1468 addrconf_addr_solict_mult(addr, &maddr);
1469 ipv6_dev_mc_inc(dev, &maddr);
1470 }
1471
1472 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1473 {
1474 struct in6_addr maddr;
1475
1476 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1477 return;
1478
1479 addrconf_addr_solict_mult(addr, &maddr);
1480 __ipv6_dev_mc_dec(idev, &maddr);
1481 }
1482
1483 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1484 {
1485 struct in6_addr addr;
1486 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1487 if (ipv6_addr_any(&addr))
1488 return;
1489 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1490 }
1491
1492 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1493 {
1494 struct in6_addr addr;
1495 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1496 if (ipv6_addr_any(&addr))
1497 return;
1498 __ipv6_dev_ac_dec(ifp->idev, &addr);
1499 }
1500
1501 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1502 {
1503 if (dev->addr_len != ETH_ALEN)
1504 return -1;
1505 memcpy(eui, dev->dev_addr, 3);
1506 memcpy(eui + 5, dev->dev_addr + 3, 3);
1507
1508 /*
1509 * The zSeries OSA network cards can be shared among various
1510 * OS instances, but the OSA cards have only one MAC address.
1511 * This leads to duplicate address conflicts in conjunction
1512 * with IPv6 if more than one instance uses the same card.
1513 *
1514 * The driver for these cards can deliver a unique 16-bit
1515 * identifier for each instance sharing the same card. It is
1516 * placed instead of 0xFFFE in the interface identifier. The
1517 * "u" bit of the interface identifier is not inverted in this
1518 * case. Hence the resulting interface identifier has local
1519 * scope according to RFC2373.
1520 */
1521 if (dev->dev_id) {
1522 eui[3] = (dev->dev_id >> 8) & 0xFF;
1523 eui[4] = dev->dev_id & 0xFF;
1524 } else {
1525 eui[3] = 0xFF;
1526 eui[4] = 0xFE;
1527 eui[0] ^= 2;
1528 }
1529 return 0;
1530 }
1531
1532 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1533 {
1534 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1535 if (dev->addr_len != ARCNET_ALEN)
1536 return -1;
1537 memset(eui, 0, 7);
1538 eui[7] = *(u8*)dev->dev_addr;
1539 return 0;
1540 }
1541
1542 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1543 {
1544 if (dev->addr_len != INFINIBAND_ALEN)
1545 return -1;
1546 memcpy(eui, dev->dev_addr + 12, 8);
1547 eui[0] |= 2;
1548 return 0;
1549 }
1550
1551 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1552 {
1553 if (addr == 0)
1554 return -1;
1555 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1556 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1557 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1558 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1559 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1560 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1561 eui[1] = 0;
1562 eui[2] = 0x5E;
1563 eui[3] = 0xFE;
1564 memcpy(eui + 4, &addr, 4);
1565 return 0;
1566 }
1567
1568 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1569 {
1570 if (dev->priv_flags & IFF_ISATAP)
1571 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1572 return -1;
1573 }
1574
1575 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1576 {
1577 switch (dev->type) {
1578 case ARPHRD_ETHER:
1579 case ARPHRD_FDDI:
1580 case ARPHRD_IEEE802_TR:
1581 return addrconf_ifid_eui48(eui, dev);
1582 case ARPHRD_ARCNET:
1583 return addrconf_ifid_arcnet(eui, dev);
1584 case ARPHRD_INFINIBAND:
1585 return addrconf_ifid_infiniband(eui, dev);
1586 case ARPHRD_SIT:
1587 return addrconf_ifid_sit(eui, dev);
1588 }
1589 return -1;
1590 }
1591
1592 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1593 {
1594 int err = -1;
1595 struct inet6_ifaddr *ifp;
1596
1597 read_lock_bh(&idev->lock);
1598 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1599 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1600 memcpy(eui, ifp->addr.s6_addr+8, 8);
1601 err = 0;
1602 break;
1603 }
1604 }
1605 read_unlock_bh(&idev->lock);
1606 return err;
1607 }
1608
1609 #ifdef CONFIG_IPV6_PRIVACY
1610 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1611 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1612 {
1613 regen:
1614 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1615 idev->rndid[0] &= ~0x02;
1616
1617 /*
1618 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1619 * check if generated address is not inappropriate
1620 *
1621 * - Reserved subnet anycast (RFC 2526)
1622 * 11111101 11....11 1xxxxxxx
1623 * - ISATAP (RFC4214) 6.1
1624 * 00-00-5E-FE-xx-xx-xx-xx
1625 * - value 0
1626 * - XXX: already assigned to an address on the device
1627 */
1628 if (idev->rndid[0] == 0xfd &&
1629 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1630 (idev->rndid[7]&0x80))
1631 goto regen;
1632 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1633 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1634 goto regen;
1635 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1636 goto regen;
1637 }
1638
1639 return 0;
1640 }
1641
1642 static void ipv6_regen_rndid(unsigned long data)
1643 {
1644 struct inet6_dev *idev = (struct inet6_dev *) data;
1645 unsigned long expires;
1646
1647 rcu_read_lock_bh();
1648 write_lock_bh(&idev->lock);
1649
1650 if (idev->dead)
1651 goto out;
1652
1653 if (__ipv6_regen_rndid(idev) < 0)
1654 goto out;
1655
1656 expires = jiffies +
1657 idev->cnf.temp_prefered_lft * HZ -
1658 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time -
1659 idev->cnf.max_desync_factor * HZ;
1660 if (time_before(expires, jiffies)) {
1661 printk(KERN_WARNING
1662 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1663 idev->dev->name);
1664 goto out;
1665 }
1666
1667 if (!mod_timer(&idev->regen_timer, expires))
1668 in6_dev_hold(idev);
1669
1670 out:
1671 write_unlock_bh(&idev->lock);
1672 rcu_read_unlock_bh();
1673 in6_dev_put(idev);
1674 }
1675
1676 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1677 int ret = 0;
1678
1679 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1680 ret = __ipv6_regen_rndid(idev);
1681 return ret;
1682 }
1683 #endif
1684
1685 /*
1686 * Add prefix route.
1687 */
1688
1689 static void
1690 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1691 unsigned long expires, u32 flags)
1692 {
1693 struct fib6_config cfg = {
1694 .fc_table = RT6_TABLE_PREFIX,
1695 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1696 .fc_ifindex = dev->ifindex,
1697 .fc_expires = expires,
1698 .fc_dst_len = plen,
1699 .fc_flags = RTF_UP | flags,
1700 .fc_nlinfo.nl_net = dev_net(dev),
1701 .fc_protocol = RTPROT_KERNEL,
1702 };
1703
1704 ipv6_addr_copy(&cfg.fc_dst, pfx);
1705
1706 /* Prevent useless cloning on PtP SIT.
1707 This thing is done here expecting that the whole
1708 class of non-broadcast devices need not cloning.
1709 */
1710 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1711 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1712 cfg.fc_flags |= RTF_NONEXTHOP;
1713 #endif
1714
1715 ip6_route_add(&cfg);
1716 }
1717
1718 /* Create "default" multicast route to the interface */
1719
1720 static void addrconf_add_mroute(struct net_device *dev)
1721 {
1722 struct fib6_config cfg = {
1723 .fc_table = RT6_TABLE_LOCAL,
1724 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1725 .fc_ifindex = dev->ifindex,
1726 .fc_dst_len = 8,
1727 .fc_flags = RTF_UP,
1728 .fc_nlinfo.nl_net = dev_net(dev),
1729 };
1730
1731 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1732
1733 ip6_route_add(&cfg);
1734 }
1735
1736 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1737 static void sit_route_add(struct net_device *dev)
1738 {
1739 struct fib6_config cfg = {
1740 .fc_table = RT6_TABLE_MAIN,
1741 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1742 .fc_ifindex = dev->ifindex,
1743 .fc_dst_len = 96,
1744 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1745 .fc_nlinfo.nl_net = dev_net(dev),
1746 };
1747
1748 /* prefix length - 96 bits "::d.d.d.d" */
1749 ip6_route_add(&cfg);
1750 }
1751 #endif
1752
1753 static void addrconf_add_lroute(struct net_device *dev)
1754 {
1755 struct in6_addr addr;
1756
1757 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1758 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1759 }
1760
1761 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1762 {
1763 struct inet6_dev *idev;
1764
1765 ASSERT_RTNL();
1766
1767 idev = ipv6_find_idev(dev);
1768 if (!idev)
1769 return ERR_PTR(-ENOBUFS);
1770
1771 if (idev->cnf.disable_ipv6)
1772 return ERR_PTR(-EACCES);
1773
1774 /* Add default multicast route */
1775 addrconf_add_mroute(dev);
1776
1777 /* Add link local route */
1778 addrconf_add_lroute(dev);
1779 return idev;
1780 }
1781
1782 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1783 {
1784 struct prefix_info *pinfo;
1785 __u32 valid_lft;
1786 __u32 prefered_lft;
1787 int addr_type;
1788 struct inet6_dev *in6_dev;
1789 struct net *net = dev_net(dev);
1790
1791 pinfo = (struct prefix_info *) opt;
1792
1793 if (len < sizeof(struct prefix_info)) {
1794 ADBG(("addrconf: prefix option too short\n"));
1795 return;
1796 }
1797
1798 /*
1799 * Validation checks ([ADDRCONF], page 19)
1800 */
1801
1802 addr_type = ipv6_addr_type(&pinfo->prefix);
1803
1804 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1805 return;
1806
1807 valid_lft = ntohl(pinfo->valid);
1808 prefered_lft = ntohl(pinfo->prefered);
1809
1810 if (prefered_lft > valid_lft) {
1811 if (net_ratelimit())
1812 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1813 return;
1814 }
1815
1816 in6_dev = in6_dev_get(dev);
1817
1818 if (in6_dev == NULL) {
1819 if (net_ratelimit())
1820 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1821 return;
1822 }
1823
1824 /*
1825 * Two things going on here:
1826 * 1) Add routes for on-link prefixes
1827 * 2) Configure prefixes with the auto flag set
1828 */
1829
1830 if (pinfo->onlink) {
1831 struct rt6_info *rt;
1832 unsigned long rt_expires;
1833
1834 /* Avoid arithmetic overflow. Really, we could
1835 * save rt_expires in seconds, likely valid_lft,
1836 * but it would require division in fib gc, that it
1837 * not good.
1838 */
1839 if (HZ > USER_HZ)
1840 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
1841 else
1842 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
1843
1844 if (addrconf_finite_timeout(rt_expires))
1845 rt_expires *= HZ;
1846
1847 rt = rt6_lookup(net, &pinfo->prefix, NULL,
1848 dev->ifindex, 1);
1849
1850 if (rt && addrconf_is_prefix_route(rt)) {
1851 /* Autoconf prefix route */
1852 if (valid_lft == 0) {
1853 ip6_del_rt(rt);
1854 rt = NULL;
1855 } else if (addrconf_finite_timeout(rt_expires)) {
1856 /* not infinity */
1857 rt->rt6i_expires = jiffies + rt_expires;
1858 rt->rt6i_flags |= RTF_EXPIRES;
1859 } else {
1860 rt->rt6i_flags &= ~RTF_EXPIRES;
1861 rt->rt6i_expires = 0;
1862 }
1863 } else if (valid_lft) {
1864 clock_t expires = 0;
1865 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
1866 if (addrconf_finite_timeout(rt_expires)) {
1867 /* not infinity */
1868 flags |= RTF_EXPIRES;
1869 expires = jiffies_to_clock_t(rt_expires);
1870 }
1871 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1872 dev, expires, flags);
1873 }
1874 if (rt)
1875 dst_release(&rt->dst);
1876 }
1877
1878 /* Try to figure out our local address for this prefix */
1879
1880 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1881 struct inet6_ifaddr * ifp;
1882 struct in6_addr addr;
1883 int create = 0, update_lft = 0;
1884
1885 if (pinfo->prefix_len == 64) {
1886 memcpy(&addr, &pinfo->prefix, 8);
1887 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1888 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1889 in6_dev_put(in6_dev);
1890 return;
1891 }
1892 goto ok;
1893 }
1894 if (net_ratelimit())
1895 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1896 pinfo->prefix_len);
1897 in6_dev_put(in6_dev);
1898 return;
1899
1900 ok:
1901
1902 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1903
1904 if (ifp == NULL && valid_lft) {
1905 int max_addresses = in6_dev->cnf.max_addresses;
1906 u32 addr_flags = 0;
1907
1908 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1909 if (in6_dev->cnf.optimistic_dad &&
1910 !net->ipv6.devconf_all->forwarding)
1911 addr_flags = IFA_F_OPTIMISTIC;
1912 #endif
1913
1914 /* Do not allow to create too much of autoconfigured
1915 * addresses; this would be too easy way to crash kernel.
1916 */
1917 if (!max_addresses ||
1918 ipv6_count_addresses(in6_dev) < max_addresses)
1919 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1920 addr_type&IPV6_ADDR_SCOPE_MASK,
1921 addr_flags);
1922
1923 if (!ifp || IS_ERR(ifp)) {
1924 in6_dev_put(in6_dev);
1925 return;
1926 }
1927
1928 update_lft = create = 1;
1929 ifp->cstamp = jiffies;
1930 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1931 }
1932
1933 if (ifp) {
1934 int flags;
1935 unsigned long now;
1936 #ifdef CONFIG_IPV6_PRIVACY
1937 struct inet6_ifaddr *ift;
1938 #endif
1939 u32 stored_lft;
1940
1941 /* update lifetime (RFC2462 5.5.3 e) */
1942 spin_lock(&ifp->lock);
1943 now = jiffies;
1944 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1945 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1946 else
1947 stored_lft = 0;
1948 if (!update_lft && stored_lft) {
1949 if (valid_lft > MIN_VALID_LIFETIME ||
1950 valid_lft > stored_lft)
1951 update_lft = 1;
1952 else if (stored_lft <= MIN_VALID_LIFETIME) {
1953 /* valid_lft <= stored_lft is always true */
1954 /*
1955 * RFC 4862 Section 5.5.3e:
1956 * "Note that the preferred lifetime of
1957 * the corresponding address is always
1958 * reset to the Preferred Lifetime in
1959 * the received Prefix Information
1960 * option, regardless of whether the
1961 * valid lifetime is also reset or
1962 * ignored."
1963 *
1964 * So if the preferred lifetime in
1965 * this advertisement is different
1966 * than what we have stored, but the
1967 * valid lifetime is invalid, just
1968 * reset prefered_lft.
1969 *
1970 * We must set the valid lifetime
1971 * to the stored lifetime since we'll
1972 * be updating the timestamp below,
1973 * else we'll set it back to the
1974 * minumum.
1975 */
1976 if (prefered_lft != ifp->prefered_lft) {
1977 valid_lft = stored_lft;
1978 update_lft = 1;
1979 }
1980 } else {
1981 valid_lft = MIN_VALID_LIFETIME;
1982 if (valid_lft < prefered_lft)
1983 prefered_lft = valid_lft;
1984 update_lft = 1;
1985 }
1986 }
1987
1988 if (update_lft) {
1989 ifp->valid_lft = valid_lft;
1990 ifp->prefered_lft = prefered_lft;
1991 ifp->tstamp = now;
1992 flags = ifp->flags;
1993 ifp->flags &= ~IFA_F_DEPRECATED;
1994 spin_unlock(&ifp->lock);
1995
1996 if (!(flags&IFA_F_TENTATIVE))
1997 ipv6_ifa_notify(0, ifp);
1998 } else
1999 spin_unlock(&ifp->lock);
2000
2001 #ifdef CONFIG_IPV6_PRIVACY
2002 read_lock_bh(&in6_dev->lock);
2003 /* update all temporary addresses in the list */
2004 list_for_each_entry(ift, &in6_dev->tempaddr_list, tmp_list) {
2005 /*
2006 * When adjusting the lifetimes of an existing
2007 * temporary address, only lower the lifetimes.
2008 * Implementations must not increase the
2009 * lifetimes of an existing temporary address
2010 * when processing a Prefix Information Option.
2011 */
2012 if (ifp != ift->ifpub)
2013 continue;
2014
2015 spin_lock(&ift->lock);
2016 flags = ift->flags;
2017 if (ift->valid_lft > valid_lft &&
2018 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
2019 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
2020 if (ift->prefered_lft > prefered_lft &&
2021 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
2022 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
2023 spin_unlock(&ift->lock);
2024 if (!(flags&IFA_F_TENTATIVE))
2025 ipv6_ifa_notify(0, ift);
2026 }
2027
2028 if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) {
2029 /*
2030 * When a new public address is created as described in [ADDRCONF],
2031 * also create a new temporary address. Also create a temporary
2032 * address if it's enabled but no temporary address currently exists.
2033 */
2034 read_unlock_bh(&in6_dev->lock);
2035 ipv6_create_tempaddr(ifp, NULL);
2036 } else {
2037 read_unlock_bh(&in6_dev->lock);
2038 }
2039 #endif
2040 in6_ifa_put(ifp);
2041 addrconf_verify(0);
2042 }
2043 }
2044 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2045 in6_dev_put(in6_dev);
2046 }
2047
2048 /*
2049 * Set destination address.
2050 * Special case for SIT interfaces where we create a new "virtual"
2051 * device.
2052 */
2053 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2054 {
2055 struct in6_ifreq ireq;
2056 struct net_device *dev;
2057 int err = -EINVAL;
2058
2059 rtnl_lock();
2060
2061 err = -EFAULT;
2062 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2063 goto err_exit;
2064
2065 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2066
2067 err = -ENODEV;
2068 if (dev == NULL)
2069 goto err_exit;
2070
2071 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2072 if (dev->type == ARPHRD_SIT) {
2073 const struct net_device_ops *ops = dev->netdev_ops;
2074 struct ifreq ifr;
2075 struct ip_tunnel_parm p;
2076
2077 err = -EADDRNOTAVAIL;
2078 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2079 goto err_exit;
2080
2081 memset(&p, 0, sizeof(p));
2082 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2083 p.iph.saddr = 0;
2084 p.iph.version = 4;
2085 p.iph.ihl = 5;
2086 p.iph.protocol = IPPROTO_IPV6;
2087 p.iph.ttl = 64;
2088 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2089
2090 if (ops->ndo_do_ioctl) {
2091 mm_segment_t oldfs = get_fs();
2092
2093 set_fs(KERNEL_DS);
2094 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2095 set_fs(oldfs);
2096 } else
2097 err = -EOPNOTSUPP;
2098
2099 if (err == 0) {
2100 err = -ENOBUFS;
2101 dev = __dev_get_by_name(net, p.name);
2102 if (!dev)
2103 goto err_exit;
2104 err = dev_open(dev);
2105 }
2106 }
2107 #endif
2108
2109 err_exit:
2110 rtnl_unlock();
2111 return err;
2112 }
2113
2114 /*
2115 * Manual configuration of address on an interface
2116 */
2117 static int inet6_addr_add(struct net *net, int ifindex, struct in6_addr *pfx,
2118 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
2119 __u32 valid_lft)
2120 {
2121 struct inet6_ifaddr *ifp;
2122 struct inet6_dev *idev;
2123 struct net_device *dev;
2124 int scope;
2125 u32 flags;
2126 clock_t expires;
2127 unsigned long timeout;
2128
2129 ASSERT_RTNL();
2130
2131 if (plen > 128)
2132 return -EINVAL;
2133
2134 /* check the lifetime */
2135 if (!valid_lft || prefered_lft > valid_lft)
2136 return -EINVAL;
2137
2138 dev = __dev_get_by_index(net, ifindex);
2139 if (!dev)
2140 return -ENODEV;
2141
2142 idev = addrconf_add_dev(dev);
2143 if (IS_ERR(idev))
2144 return PTR_ERR(idev);
2145
2146 scope = ipv6_addr_scope(pfx);
2147
2148 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2149 if (addrconf_finite_timeout(timeout)) {
2150 expires = jiffies_to_clock_t(timeout * HZ);
2151 valid_lft = timeout;
2152 flags = RTF_EXPIRES;
2153 } else {
2154 expires = 0;
2155 flags = 0;
2156 ifa_flags |= IFA_F_PERMANENT;
2157 }
2158
2159 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2160 if (addrconf_finite_timeout(timeout)) {
2161 if (timeout == 0)
2162 ifa_flags |= IFA_F_DEPRECATED;
2163 prefered_lft = timeout;
2164 }
2165
2166 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2167
2168 if (!IS_ERR(ifp)) {
2169 spin_lock_bh(&ifp->lock);
2170 ifp->valid_lft = valid_lft;
2171 ifp->prefered_lft = prefered_lft;
2172 ifp->tstamp = jiffies;
2173 spin_unlock_bh(&ifp->lock);
2174
2175 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2176 expires, flags);
2177 /*
2178 * Note that section 3.1 of RFC 4429 indicates
2179 * that the Optimistic flag should not be set for
2180 * manually configured addresses
2181 */
2182 addrconf_dad_start(ifp, 0);
2183 in6_ifa_put(ifp);
2184 addrconf_verify(0);
2185 return 0;
2186 }
2187
2188 return PTR_ERR(ifp);
2189 }
2190
2191 static int inet6_addr_del(struct net *net, int ifindex, struct in6_addr *pfx,
2192 unsigned int plen)
2193 {
2194 struct inet6_ifaddr *ifp;
2195 struct inet6_dev *idev;
2196 struct net_device *dev;
2197
2198 if (plen > 128)
2199 return -EINVAL;
2200
2201 dev = __dev_get_by_index(net, ifindex);
2202 if (!dev)
2203 return -ENODEV;
2204
2205 if ((idev = __in6_dev_get(dev)) == NULL)
2206 return -ENXIO;
2207
2208 read_lock_bh(&idev->lock);
2209 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2210 if (ifp->prefix_len == plen &&
2211 ipv6_addr_equal(pfx, &ifp->addr)) {
2212 in6_ifa_hold(ifp);
2213 read_unlock_bh(&idev->lock);
2214
2215 ipv6_del_addr(ifp);
2216
2217 /* If the last address is deleted administratively,
2218 disable IPv6 on this interface.
2219 */
2220 if (list_empty(&idev->addr_list))
2221 addrconf_ifdown(idev->dev, 1);
2222 return 0;
2223 }
2224 }
2225 read_unlock_bh(&idev->lock);
2226 return -EADDRNOTAVAIL;
2227 }
2228
2229
2230 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2231 {
2232 struct in6_ifreq ireq;
2233 int err;
2234
2235 if (!capable(CAP_NET_ADMIN))
2236 return -EPERM;
2237
2238 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2239 return -EFAULT;
2240
2241 rtnl_lock();
2242 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2243 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2244 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2245 rtnl_unlock();
2246 return err;
2247 }
2248
2249 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2250 {
2251 struct in6_ifreq ireq;
2252 int err;
2253
2254 if (!capable(CAP_NET_ADMIN))
2255 return -EPERM;
2256
2257 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2258 return -EFAULT;
2259
2260 rtnl_lock();
2261 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2262 ireq.ifr6_prefixlen);
2263 rtnl_unlock();
2264 return err;
2265 }
2266
2267 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2268 int plen, int scope)
2269 {
2270 struct inet6_ifaddr *ifp;
2271
2272 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT);
2273 if (!IS_ERR(ifp)) {
2274 spin_lock_bh(&ifp->lock);
2275 ifp->flags &= ~IFA_F_TENTATIVE;
2276 spin_unlock_bh(&ifp->lock);
2277 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2278 in6_ifa_put(ifp);
2279 }
2280 }
2281
2282 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2283 static void sit_add_v4_addrs(struct inet6_dev *idev)
2284 {
2285 struct in6_addr addr;
2286 struct net_device *dev;
2287 struct net *net = dev_net(idev->dev);
2288 int scope;
2289
2290 ASSERT_RTNL();
2291
2292 memset(&addr, 0, sizeof(struct in6_addr));
2293 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2294
2295 if (idev->dev->flags&IFF_POINTOPOINT) {
2296 addr.s6_addr32[0] = htonl(0xfe800000);
2297 scope = IFA_LINK;
2298 } else {
2299 scope = IPV6_ADDR_COMPATv4;
2300 }
2301
2302 if (addr.s6_addr32[3]) {
2303 add_addr(idev, &addr, 128, scope);
2304 return;
2305 }
2306
2307 for_each_netdev(net, dev) {
2308 struct in_device * in_dev = __in_dev_get_rtnl(dev);
2309 if (in_dev && (dev->flags & IFF_UP)) {
2310 struct in_ifaddr * ifa;
2311
2312 int flag = scope;
2313
2314 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2315 int plen;
2316
2317 addr.s6_addr32[3] = ifa->ifa_local;
2318
2319 if (ifa->ifa_scope == RT_SCOPE_LINK)
2320 continue;
2321 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2322 if (idev->dev->flags&IFF_POINTOPOINT)
2323 continue;
2324 flag |= IFA_HOST;
2325 }
2326 if (idev->dev->flags&IFF_POINTOPOINT)
2327 plen = 64;
2328 else
2329 plen = 96;
2330
2331 add_addr(idev, &addr, plen, flag);
2332 }
2333 }
2334 }
2335 }
2336 #endif
2337
2338 static void init_loopback(struct net_device *dev)
2339 {
2340 struct inet6_dev *idev;
2341
2342 /* ::1 */
2343
2344 ASSERT_RTNL();
2345
2346 if ((idev = ipv6_find_idev(dev)) == NULL) {
2347 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2348 return;
2349 }
2350
2351 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2352 }
2353
2354 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2355 {
2356 struct inet6_ifaddr * ifp;
2357 u32 addr_flags = IFA_F_PERMANENT;
2358
2359 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2360 if (idev->cnf.optimistic_dad &&
2361 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2362 addr_flags |= IFA_F_OPTIMISTIC;
2363 #endif
2364
2365
2366 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2367 if (!IS_ERR(ifp)) {
2368 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2369 addrconf_dad_start(ifp, 0);
2370 in6_ifa_put(ifp);
2371 }
2372 }
2373
2374 static void addrconf_dev_config(struct net_device *dev)
2375 {
2376 struct in6_addr addr;
2377 struct inet6_dev * idev;
2378
2379 ASSERT_RTNL();
2380
2381 if ((dev->type != ARPHRD_ETHER) &&
2382 (dev->type != ARPHRD_FDDI) &&
2383 (dev->type != ARPHRD_IEEE802_TR) &&
2384 (dev->type != ARPHRD_ARCNET) &&
2385 (dev->type != ARPHRD_INFINIBAND)) {
2386 /* Alas, we support only Ethernet autoconfiguration. */
2387 return;
2388 }
2389
2390 idev = addrconf_add_dev(dev);
2391 if (IS_ERR(idev))
2392 return;
2393
2394 memset(&addr, 0, sizeof(struct in6_addr));
2395 addr.s6_addr32[0] = htonl(0xFE800000);
2396
2397 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2398 addrconf_add_linklocal(idev, &addr);
2399 }
2400
2401 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2402 static void addrconf_sit_config(struct net_device *dev)
2403 {
2404 struct inet6_dev *idev;
2405
2406 ASSERT_RTNL();
2407
2408 /*
2409 * Configure the tunnel with one of our IPv4
2410 * addresses... we should configure all of
2411 * our v4 addrs in the tunnel
2412 */
2413
2414 if ((idev = ipv6_find_idev(dev)) == NULL) {
2415 printk(KERN_DEBUG "init sit: add_dev failed\n");
2416 return;
2417 }
2418
2419 if (dev->priv_flags & IFF_ISATAP) {
2420 struct in6_addr addr;
2421
2422 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2423 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2424 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2425 addrconf_add_linklocal(idev, &addr);
2426 return;
2427 }
2428
2429 sit_add_v4_addrs(idev);
2430
2431 if (dev->flags&IFF_POINTOPOINT) {
2432 addrconf_add_mroute(dev);
2433 addrconf_add_lroute(dev);
2434 } else
2435 sit_route_add(dev);
2436 }
2437 #endif
2438
2439 static inline int
2440 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2441 {
2442 struct in6_addr lladdr;
2443
2444 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2445 addrconf_add_linklocal(idev, &lladdr);
2446 return 0;
2447 }
2448 return -1;
2449 }
2450
2451 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2452 {
2453 struct net_device *link_dev;
2454 struct net *net = dev_net(idev->dev);
2455
2456 /* first try to inherit the link-local address from the link device */
2457 if (idev->dev->iflink &&
2458 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
2459 if (!ipv6_inherit_linklocal(idev, link_dev))
2460 return;
2461 }
2462 /* then try to inherit it from any device */
2463 for_each_netdev(net, link_dev) {
2464 if (!ipv6_inherit_linklocal(idev, link_dev))
2465 return;
2466 }
2467 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2468 }
2469
2470 /*
2471 * Autoconfigure tunnel with a link-local address so routing protocols,
2472 * DHCPv6, MLD etc. can be run over the virtual link
2473 */
2474
2475 static void addrconf_ip6_tnl_config(struct net_device *dev)
2476 {
2477 struct inet6_dev *idev;
2478
2479 ASSERT_RTNL();
2480
2481 idev = addrconf_add_dev(dev);
2482 if (IS_ERR(idev)) {
2483 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2484 return;
2485 }
2486 ip6_tnl_add_linklocal(idev);
2487 }
2488
2489 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2490 void * data)
2491 {
2492 struct net_device *dev = (struct net_device *) data;
2493 struct inet6_dev *idev = __in6_dev_get(dev);
2494 int run_pending = 0;
2495 int err;
2496
2497 switch (event) {
2498 case NETDEV_REGISTER:
2499 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2500 idev = ipv6_add_dev(dev);
2501 if (!idev)
2502 return notifier_from_errno(-ENOMEM);
2503 }
2504 break;
2505
2506 case NETDEV_UP:
2507 case NETDEV_CHANGE:
2508 if (dev->flags & IFF_SLAVE)
2509 break;
2510
2511 if (event == NETDEV_UP) {
2512 if (!addrconf_qdisc_ok(dev)) {
2513 /* device is not ready yet. */
2514 printk(KERN_INFO
2515 "ADDRCONF(NETDEV_UP): %s: "
2516 "link is not ready\n",
2517 dev->name);
2518 break;
2519 }
2520
2521 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2522 idev = ipv6_add_dev(dev);
2523
2524 if (idev) {
2525 idev->if_flags |= IF_READY;
2526 run_pending = 1;
2527 }
2528 } else {
2529 if (!addrconf_qdisc_ok(dev)) {
2530 /* device is still not ready. */
2531 break;
2532 }
2533
2534 if (idev) {
2535 if (idev->if_flags & IF_READY)
2536 /* device is already configured. */
2537 break;
2538 idev->if_flags |= IF_READY;
2539 }
2540
2541 printk(KERN_INFO
2542 "ADDRCONF(NETDEV_CHANGE): %s: "
2543 "link becomes ready\n",
2544 dev->name);
2545
2546 run_pending = 1;
2547 }
2548
2549 switch (dev->type) {
2550 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2551 case ARPHRD_SIT:
2552 addrconf_sit_config(dev);
2553 break;
2554 #endif
2555 case ARPHRD_TUNNEL6:
2556 addrconf_ip6_tnl_config(dev);
2557 break;
2558 case ARPHRD_LOOPBACK:
2559 init_loopback(dev);
2560 break;
2561
2562 default:
2563 addrconf_dev_config(dev);
2564 break;
2565 }
2566
2567 if (idev) {
2568 if (run_pending)
2569 addrconf_dad_run(idev);
2570
2571 /*
2572 * If the MTU changed during the interface down,
2573 * when the interface up, the changed MTU must be
2574 * reflected in the idev as well as routers.
2575 */
2576 if (idev->cnf.mtu6 != dev->mtu &&
2577 dev->mtu >= IPV6_MIN_MTU) {
2578 rt6_mtu_change(dev, dev->mtu);
2579 idev->cnf.mtu6 = dev->mtu;
2580 }
2581 idev->tstamp = jiffies;
2582 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2583
2584 /*
2585 * If the changed mtu during down is lower than
2586 * IPV6_MIN_MTU stop IPv6 on this interface.
2587 */
2588 if (dev->mtu < IPV6_MIN_MTU)
2589 addrconf_ifdown(dev, 1);
2590 }
2591 break;
2592
2593 case NETDEV_CHANGEMTU:
2594 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2595 rt6_mtu_change(dev, dev->mtu);
2596 idev->cnf.mtu6 = dev->mtu;
2597 break;
2598 }
2599
2600 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2601 idev = ipv6_add_dev(dev);
2602 if (idev)
2603 break;
2604 }
2605
2606 /*
2607 * MTU falled under IPV6_MIN_MTU.
2608 * Stop IPv6 on this interface.
2609 */
2610
2611 case NETDEV_DOWN:
2612 case NETDEV_UNREGISTER:
2613 /*
2614 * Remove all addresses from this interface.
2615 */
2616 addrconf_ifdown(dev, event != NETDEV_DOWN);
2617 break;
2618
2619 case NETDEV_CHANGENAME:
2620 if (idev) {
2621 snmp6_unregister_dev(idev);
2622 addrconf_sysctl_unregister(idev);
2623 addrconf_sysctl_register(idev);
2624 err = snmp6_register_dev(idev);
2625 if (err)
2626 return notifier_from_errno(err);
2627 }
2628 break;
2629
2630 case NETDEV_PRE_TYPE_CHANGE:
2631 case NETDEV_POST_TYPE_CHANGE:
2632 addrconf_type_change(dev, event);
2633 break;
2634 }
2635
2636 return NOTIFY_OK;
2637 }
2638
2639 /*
2640 * addrconf module should be notified of a device going up
2641 */
2642 static struct notifier_block ipv6_dev_notf = {
2643 .notifier_call = addrconf_notify,
2644 };
2645
2646 static void addrconf_type_change(struct net_device *dev, unsigned long event)
2647 {
2648 struct inet6_dev *idev;
2649 ASSERT_RTNL();
2650
2651 idev = __in6_dev_get(dev);
2652
2653 if (event == NETDEV_POST_TYPE_CHANGE)
2654 ipv6_mc_remap(idev);
2655 else if (event == NETDEV_PRE_TYPE_CHANGE)
2656 ipv6_mc_unmap(idev);
2657 }
2658
2659 static int addrconf_ifdown(struct net_device *dev, int how)
2660 {
2661 struct net *net = dev_net(dev);
2662 struct inet6_dev *idev;
2663 struct inet6_ifaddr *ifa;
2664 int state, i;
2665
2666 ASSERT_RTNL();
2667
2668 rt6_ifdown(net, dev);
2669 neigh_ifdown(&nd_tbl, dev);
2670
2671 idev = __in6_dev_get(dev);
2672 if (idev == NULL)
2673 return -ENODEV;
2674
2675 /*
2676 * Step 1: remove reference to ipv6 device from parent device.
2677 * Do not dev_put!
2678 */
2679 if (how) {
2680 idev->dead = 1;
2681
2682 /* protected by rtnl_lock */
2683 rcu_assign_pointer(dev->ip6_ptr, NULL);
2684
2685 /* Step 1.5: remove snmp6 entry */
2686 snmp6_unregister_dev(idev);
2687
2688 }
2689
2690 /* Step 2: clear hash table */
2691 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
2692 struct hlist_head *h = &inet6_addr_lst[i];
2693 struct hlist_node *n;
2694
2695 spin_lock_bh(&addrconf_hash_lock);
2696 restart:
2697 hlist_for_each_entry_rcu(ifa, n, h, addr_lst) {
2698 if (ifa->idev == idev) {
2699 hlist_del_init_rcu(&ifa->addr_lst);
2700 addrconf_del_timer(ifa);
2701 goto restart;
2702 }
2703 }
2704 spin_unlock_bh(&addrconf_hash_lock);
2705 }
2706
2707 write_lock_bh(&idev->lock);
2708
2709 /* Step 2: clear flags for stateless addrconf */
2710 if (!how)
2711 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2712
2713 #ifdef CONFIG_IPV6_PRIVACY
2714 if (how && del_timer(&idev->regen_timer))
2715 in6_dev_put(idev);
2716
2717 /* Step 3: clear tempaddr list */
2718 while (!list_empty(&idev->tempaddr_list)) {
2719 ifa = list_first_entry(&idev->tempaddr_list,
2720 struct inet6_ifaddr, tmp_list);
2721 list_del(&ifa->tmp_list);
2722 write_unlock_bh(&idev->lock);
2723 spin_lock_bh(&ifa->lock);
2724
2725 if (ifa->ifpub) {
2726 in6_ifa_put(ifa->ifpub);
2727 ifa->ifpub = NULL;
2728 }
2729 spin_unlock_bh(&ifa->lock);
2730 in6_ifa_put(ifa);
2731 write_lock_bh(&idev->lock);
2732 }
2733 #endif
2734
2735 while (!list_empty(&idev->addr_list)) {
2736 ifa = list_first_entry(&idev->addr_list,
2737 struct inet6_ifaddr, if_list);
2738 addrconf_del_timer(ifa);
2739
2740 list_del(&ifa->if_list);
2741
2742 write_unlock_bh(&idev->lock);
2743
2744 spin_lock_bh(&ifa->state_lock);
2745 state = ifa->state;
2746 ifa->state = INET6_IFADDR_STATE_DEAD;
2747 spin_unlock_bh(&ifa->state_lock);
2748
2749 if (state != INET6_IFADDR_STATE_DEAD) {
2750 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2751 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2752 }
2753 in6_ifa_put(ifa);
2754
2755 write_lock_bh(&idev->lock);
2756 }
2757
2758 write_unlock_bh(&idev->lock);
2759
2760 /* Step 5: Discard multicast list */
2761 if (how)
2762 ipv6_mc_destroy_dev(idev);
2763 else
2764 ipv6_mc_down(idev);
2765
2766 idev->tstamp = jiffies;
2767
2768 /* Last: Shot the device (if unregistered) */
2769 if (how) {
2770 addrconf_sysctl_unregister(idev);
2771 neigh_parms_release(&nd_tbl, idev->nd_parms);
2772 neigh_ifdown(&nd_tbl, dev);
2773 in6_dev_put(idev);
2774 }
2775 return 0;
2776 }
2777
2778 static void addrconf_rs_timer(unsigned long data)
2779 {
2780 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2781 struct inet6_dev *idev = ifp->idev;
2782
2783 read_lock(&idev->lock);
2784 if (idev->dead || !(idev->if_flags & IF_READY))
2785 goto out;
2786
2787 if (idev->cnf.forwarding)
2788 goto out;
2789
2790 /* Announcement received after solicitation was sent */
2791 if (idev->if_flags & IF_RA_RCVD)
2792 goto out;
2793
2794 spin_lock(&ifp->lock);
2795 if (ifp->probes++ < idev->cnf.rtr_solicits) {
2796 /* The wait after the last probe can be shorter */
2797 addrconf_mod_timer(ifp, AC_RS,
2798 (ifp->probes == idev->cnf.rtr_solicits) ?
2799 idev->cnf.rtr_solicit_delay :
2800 idev->cnf.rtr_solicit_interval);
2801 spin_unlock(&ifp->lock);
2802
2803 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2804 } else {
2805 spin_unlock(&ifp->lock);
2806 /*
2807 * Note: we do not support deprecated "all on-link"
2808 * assumption any longer.
2809 */
2810 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2811 idev->dev->name);
2812 }
2813
2814 out:
2815 read_unlock(&idev->lock);
2816 in6_ifa_put(ifp);
2817 }
2818
2819 /*
2820 * Duplicate Address Detection
2821 */
2822 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2823 {
2824 unsigned long rand_num;
2825 struct inet6_dev *idev = ifp->idev;
2826
2827 if (ifp->flags & IFA_F_OPTIMISTIC)
2828 rand_num = 0;
2829 else
2830 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2831
2832 ifp->probes = idev->cnf.dad_transmits;
2833 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2834 }
2835
2836 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2837 {
2838 struct inet6_dev *idev = ifp->idev;
2839 struct net_device *dev = idev->dev;
2840
2841 addrconf_join_solict(dev, &ifp->addr);
2842
2843 net_srandom(ifp->addr.s6_addr32[3]);
2844
2845 read_lock_bh(&idev->lock);
2846 spin_lock(&ifp->lock);
2847 if (ifp->state == INET6_IFADDR_STATE_DEAD)
2848 goto out;
2849
2850 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2851 idev->cnf.accept_dad < 1 ||
2852 !(ifp->flags&IFA_F_TENTATIVE) ||
2853 ifp->flags & IFA_F_NODAD) {
2854 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
2855 spin_unlock(&ifp->lock);
2856 read_unlock_bh(&idev->lock);
2857
2858 addrconf_dad_completed(ifp);
2859 return;
2860 }
2861
2862 if (!(idev->if_flags & IF_READY)) {
2863 spin_unlock(&ifp->lock);
2864 read_unlock_bh(&idev->lock);
2865 /*
2866 * If the device is not ready:
2867 * - keep it tentative if it is a permanent address.
2868 * - otherwise, kill it.
2869 */
2870 in6_ifa_hold(ifp);
2871 addrconf_dad_stop(ifp, 0);
2872 return;
2873 }
2874
2875 /*
2876 * Optimistic nodes can start receiving
2877 * Frames right away
2878 */
2879 if (ifp->flags & IFA_F_OPTIMISTIC)
2880 ip6_ins_rt(ifp->rt);
2881
2882 addrconf_dad_kick(ifp);
2883 out:
2884 spin_unlock(&ifp->lock);
2885 read_unlock_bh(&idev->lock);
2886 }
2887
2888 static void addrconf_dad_timer(unsigned long data)
2889 {
2890 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2891 struct inet6_dev *idev = ifp->idev;
2892 struct in6_addr mcaddr;
2893
2894 if (!ifp->probes && addrconf_dad_end(ifp))
2895 goto out;
2896
2897 read_lock(&idev->lock);
2898 if (idev->dead || !(idev->if_flags & IF_READY)) {
2899 read_unlock(&idev->lock);
2900 goto out;
2901 }
2902
2903 spin_lock(&ifp->lock);
2904 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
2905 spin_unlock(&ifp->lock);
2906 read_unlock(&idev->lock);
2907 goto out;
2908 }
2909
2910 if (ifp->probes == 0) {
2911 /*
2912 * DAD was successful
2913 */
2914
2915 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
2916 spin_unlock(&ifp->lock);
2917 read_unlock(&idev->lock);
2918
2919 addrconf_dad_completed(ifp);
2920
2921 goto out;
2922 }
2923
2924 ifp->probes--;
2925 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2926 spin_unlock(&ifp->lock);
2927 read_unlock(&idev->lock);
2928
2929 /* send a neighbour solicitation for our addr */
2930 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2931 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
2932 out:
2933 in6_ifa_put(ifp);
2934 }
2935
2936 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2937 {
2938 struct net_device *dev = ifp->idev->dev;
2939
2940 /*
2941 * Configure the address for reception. Now it is valid.
2942 */
2943
2944 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2945
2946 /* If added prefix is link local and forwarding is off,
2947 start sending router solicitations.
2948 */
2949
2950 if ((ifp->idev->cnf.forwarding == 0 ||
2951 ifp->idev->cnf.forwarding == 2) &&
2952 ifp->idev->cnf.rtr_solicits > 0 &&
2953 (dev->flags&IFF_LOOPBACK) == 0 &&
2954 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2955 /*
2956 * If a host as already performed a random delay
2957 * [...] as part of DAD [...] there is no need
2958 * to delay again before sending the first RS
2959 */
2960 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2961
2962 spin_lock_bh(&ifp->lock);
2963 ifp->probes = 1;
2964 ifp->idev->if_flags |= IF_RS_SENT;
2965 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2966 spin_unlock_bh(&ifp->lock);
2967 }
2968 }
2969
2970 static void addrconf_dad_run(struct inet6_dev *idev)
2971 {
2972 struct inet6_ifaddr *ifp;
2973
2974 read_lock_bh(&idev->lock);
2975 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2976 spin_lock(&ifp->lock);
2977 if (ifp->flags & IFA_F_TENTATIVE &&
2978 ifp->state == INET6_IFADDR_STATE_DAD)
2979 addrconf_dad_kick(ifp);
2980 spin_unlock(&ifp->lock);
2981 }
2982 read_unlock_bh(&idev->lock);
2983 }
2984
2985 #ifdef CONFIG_PROC_FS
2986 struct if6_iter_state {
2987 struct seq_net_private p;
2988 int bucket;
2989 };
2990
2991 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2992 {
2993 struct inet6_ifaddr *ifa = NULL;
2994 struct if6_iter_state *state = seq->private;
2995 struct net *net = seq_file_net(seq);
2996
2997 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2998 struct hlist_node *n;
2999 hlist_for_each_entry_rcu_bh(ifa, n, &inet6_addr_lst[state->bucket],
3000 addr_lst)
3001 if (net_eq(dev_net(ifa->idev->dev), net))
3002 return ifa;
3003 }
3004 return NULL;
3005 }
3006
3007 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3008 struct inet6_ifaddr *ifa)
3009 {
3010 struct if6_iter_state *state = seq->private;
3011 struct net *net = seq_file_net(seq);
3012 struct hlist_node *n = &ifa->addr_lst;
3013
3014 hlist_for_each_entry_continue_rcu_bh(ifa, n, addr_lst)
3015 if (net_eq(dev_net(ifa->idev->dev), net))
3016 return ifa;
3017
3018 while (++state->bucket < IN6_ADDR_HSIZE) {
3019 hlist_for_each_entry_rcu_bh(ifa, n,
3020 &inet6_addr_lst[state->bucket], addr_lst) {
3021 if (net_eq(dev_net(ifa->idev->dev), net))
3022 return ifa;
3023 }
3024 }
3025
3026 return NULL;
3027 }
3028
3029 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
3030 {
3031 struct inet6_ifaddr *ifa = if6_get_first(seq);
3032
3033 if (ifa)
3034 while (pos && (ifa = if6_get_next(seq, ifa)) != NULL)
3035 --pos;
3036 return pos ? NULL : ifa;
3037 }
3038
3039 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3040 __acquires(rcu_bh)
3041 {
3042 rcu_read_lock_bh();
3043 return if6_get_idx(seq, *pos);
3044 }
3045
3046 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3047 {
3048 struct inet6_ifaddr *ifa;
3049
3050 ifa = if6_get_next(seq, v);
3051 ++*pos;
3052 return ifa;
3053 }
3054
3055 static void if6_seq_stop(struct seq_file *seq, void *v)
3056 __releases(rcu_bh)
3057 {
3058 rcu_read_unlock_bh();
3059 }
3060
3061 static int if6_seq_show(struct seq_file *seq, void *v)
3062 {
3063 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3064 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3065 &ifp->addr,
3066 ifp->idev->dev->ifindex,
3067 ifp->prefix_len,
3068 ifp->scope,
3069 ifp->flags,
3070 ifp->idev->dev->name);
3071 return 0;
3072 }
3073
3074 static const struct seq_operations if6_seq_ops = {
3075 .start = if6_seq_start,
3076 .next = if6_seq_next,
3077 .show = if6_seq_show,
3078 .stop = if6_seq_stop,
3079 };
3080
3081 static int if6_seq_open(struct inode *inode, struct file *file)
3082 {
3083 return seq_open_net(inode, file, &if6_seq_ops,
3084 sizeof(struct if6_iter_state));
3085 }
3086
3087 static const struct file_operations if6_fops = {
3088 .owner = THIS_MODULE,
3089 .open = if6_seq_open,
3090 .read = seq_read,
3091 .llseek = seq_lseek,
3092 .release = seq_release_net,
3093 };
3094
3095 static int __net_init if6_proc_net_init(struct net *net)
3096 {
3097 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
3098 return -ENOMEM;
3099 return 0;
3100 }
3101
3102 static void __net_exit if6_proc_net_exit(struct net *net)
3103 {
3104 proc_net_remove(net, "if_inet6");
3105 }
3106
3107 static struct pernet_operations if6_proc_net_ops = {
3108 .init = if6_proc_net_init,
3109 .exit = if6_proc_net_exit,
3110 };
3111
3112 int __init if6_proc_init(void)
3113 {
3114 return register_pernet_subsys(&if6_proc_net_ops);
3115 }
3116
3117 void if6_proc_exit(void)
3118 {
3119 unregister_pernet_subsys(&if6_proc_net_ops);
3120 }
3121 #endif /* CONFIG_PROC_FS */
3122
3123 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3124 /* Check if address is a home address configured on any interface. */
3125 int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr)
3126 {
3127 int ret = 0;
3128 struct inet6_ifaddr *ifp = NULL;
3129 struct hlist_node *n;
3130 unsigned int hash = ipv6_addr_hash(addr);
3131
3132 rcu_read_lock_bh();
3133 hlist_for_each_entry_rcu_bh(ifp, n, &inet6_addr_lst[hash], addr_lst) {
3134 if (!net_eq(dev_net(ifp->idev->dev), net))
3135 continue;
3136 if (ipv6_addr_equal(&ifp->addr, addr) &&
3137 (ifp->flags & IFA_F_HOMEADDRESS)) {
3138 ret = 1;
3139 break;
3140 }
3141 }
3142 rcu_read_unlock_bh();
3143 return ret;
3144 }
3145 #endif
3146
3147 /*
3148 * Periodic address status verification
3149 */
3150
3151 static void addrconf_verify(unsigned long foo)
3152 {
3153 unsigned long now, next, next_sec, next_sched;
3154 struct inet6_ifaddr *ifp;
3155 struct hlist_node *node;
3156 int i;
3157
3158 rcu_read_lock_bh();
3159 spin_lock(&addrconf_verify_lock);
3160 now = jiffies;
3161 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3162
3163 del_timer(&addr_chk_timer);
3164
3165 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3166 restart:
3167 hlist_for_each_entry_rcu_bh(ifp, node,
3168 &inet6_addr_lst[i], addr_lst) {
3169 unsigned long age;
3170
3171 if (ifp->flags & IFA_F_PERMANENT)
3172 continue;
3173
3174 spin_lock(&ifp->lock);
3175 /* We try to batch several events at once. */
3176 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3177
3178 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3179 age >= ifp->valid_lft) {
3180 spin_unlock(&ifp->lock);
3181 in6_ifa_hold(ifp);
3182 ipv6_del_addr(ifp);
3183 goto restart;
3184 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3185 spin_unlock(&ifp->lock);
3186 continue;
3187 } else if (age >= ifp->prefered_lft) {
3188 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3189 int deprecate = 0;
3190
3191 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3192 deprecate = 1;
3193 ifp->flags |= IFA_F_DEPRECATED;
3194 }
3195
3196 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3197 next = ifp->tstamp + ifp->valid_lft * HZ;
3198
3199 spin_unlock(&ifp->lock);
3200
3201 if (deprecate) {
3202 in6_ifa_hold(ifp);
3203
3204 ipv6_ifa_notify(0, ifp);
3205 in6_ifa_put(ifp);
3206 goto restart;
3207 }
3208 #ifdef CONFIG_IPV6_PRIVACY
3209 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3210 !(ifp->flags&IFA_F_TENTATIVE)) {
3211 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3212 ifp->idev->cnf.dad_transmits *
3213 ifp->idev->nd_parms->retrans_time / HZ;
3214
3215 if (age >= ifp->prefered_lft - regen_advance) {
3216 struct inet6_ifaddr *ifpub = ifp->ifpub;
3217 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3218 next = ifp->tstamp + ifp->prefered_lft * HZ;
3219 if (!ifp->regen_count && ifpub) {
3220 ifp->regen_count++;
3221 in6_ifa_hold(ifp);
3222 in6_ifa_hold(ifpub);
3223 spin_unlock(&ifp->lock);
3224
3225 spin_lock(&ifpub->lock);
3226 ifpub->regen_count = 0;
3227 spin_unlock(&ifpub->lock);
3228 ipv6_create_tempaddr(ifpub, ifp);
3229 in6_ifa_put(ifpub);
3230 in6_ifa_put(ifp);
3231 goto restart;
3232 }
3233 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3234 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3235 spin_unlock(&ifp->lock);
3236 #endif
3237 } else {
3238 /* ifp->prefered_lft <= ifp->valid_lft */
3239 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3240 next = ifp->tstamp + ifp->prefered_lft * HZ;
3241 spin_unlock(&ifp->lock);
3242 }
3243 }
3244 }
3245
3246 next_sec = round_jiffies_up(next);
3247 next_sched = next;
3248
3249 /* If rounded timeout is accurate enough, accept it. */
3250 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3251 next_sched = next_sec;
3252
3253 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3254 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3255 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3256
3257 ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3258 now, next, next_sec, next_sched));
3259
3260 addr_chk_timer.expires = next_sched;
3261 add_timer(&addr_chk_timer);
3262 spin_unlock(&addrconf_verify_lock);
3263 rcu_read_unlock_bh();
3264 }
3265
3266 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3267 {
3268 struct in6_addr *pfx = NULL;
3269
3270 if (addr)
3271 pfx = nla_data(addr);
3272
3273 if (local) {
3274 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3275 pfx = NULL;
3276 else
3277 pfx = nla_data(local);
3278 }
3279
3280 return pfx;
3281 }
3282
3283 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3284 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3285 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3286 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3287 };
3288
3289 static int
3290 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3291 {
3292 struct net *net = sock_net(skb->sk);
3293 struct ifaddrmsg *ifm;
3294 struct nlattr *tb[IFA_MAX+1];
3295 struct in6_addr *pfx;
3296 int err;
3297
3298 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3299 if (err < 0)
3300 return err;
3301
3302 ifm = nlmsg_data(nlh);
3303 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3304 if (pfx == NULL)
3305 return -EINVAL;
3306
3307 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3308 }
3309
3310 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3311 u32 prefered_lft, u32 valid_lft)
3312 {
3313 u32 flags;
3314 clock_t expires;
3315 unsigned long timeout;
3316
3317 if (!valid_lft || (prefered_lft > valid_lft))
3318 return -EINVAL;
3319
3320 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3321 if (addrconf_finite_timeout(timeout)) {
3322 expires = jiffies_to_clock_t(timeout * HZ);
3323 valid_lft = timeout;
3324 flags = RTF_EXPIRES;
3325 } else {
3326 expires = 0;
3327 flags = 0;
3328 ifa_flags |= IFA_F_PERMANENT;
3329 }
3330
3331 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3332 if (addrconf_finite_timeout(timeout)) {
3333 if (timeout == 0)
3334 ifa_flags |= IFA_F_DEPRECATED;
3335 prefered_lft = timeout;
3336 }
3337
3338 spin_lock_bh(&ifp->lock);
3339 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3340 ifp->tstamp = jiffies;
3341 ifp->valid_lft = valid_lft;
3342 ifp->prefered_lft = prefered_lft;
3343
3344 spin_unlock_bh(&ifp->lock);
3345 if (!(ifp->flags&IFA_F_TENTATIVE))
3346 ipv6_ifa_notify(0, ifp);
3347
3348 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3349 expires, flags);
3350 addrconf_verify(0);
3351
3352 return 0;
3353 }
3354
3355 static int
3356 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3357 {
3358 struct net *net = sock_net(skb->sk);
3359 struct ifaddrmsg *ifm;
3360 struct nlattr *tb[IFA_MAX+1];
3361 struct in6_addr *pfx;
3362 struct inet6_ifaddr *ifa;
3363 struct net_device *dev;
3364 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3365 u8 ifa_flags;
3366 int err;
3367
3368 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3369 if (err < 0)
3370 return err;
3371
3372 ifm = nlmsg_data(nlh);
3373 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3374 if (pfx == NULL)
3375 return -EINVAL;
3376
3377 if (tb[IFA_CACHEINFO]) {
3378 struct ifa_cacheinfo *ci;
3379
3380 ci = nla_data(tb[IFA_CACHEINFO]);
3381 valid_lft = ci->ifa_valid;
3382 preferred_lft = ci->ifa_prefered;
3383 } else {
3384 preferred_lft = INFINITY_LIFE_TIME;
3385 valid_lft = INFINITY_LIFE_TIME;
3386 }
3387
3388 dev = __dev_get_by_index(net, ifm->ifa_index);
3389 if (dev == NULL)
3390 return -ENODEV;
3391
3392 /* We ignore other flags so far. */
3393 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3394
3395 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3396 if (ifa == NULL) {
3397 /*
3398 * It would be best to check for !NLM_F_CREATE here but
3399 * userspace alreay relies on not having to provide this.
3400 */
3401 return inet6_addr_add(net, ifm->ifa_index, pfx,
3402 ifm->ifa_prefixlen, ifa_flags,
3403 preferred_lft, valid_lft);
3404 }
3405
3406 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3407 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3408 err = -EEXIST;
3409 else
3410 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3411
3412 in6_ifa_put(ifa);
3413
3414 return err;
3415 }
3416
3417 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3418 u8 scope, int ifindex)
3419 {
3420 struct ifaddrmsg *ifm;
3421
3422 ifm = nlmsg_data(nlh);
3423 ifm->ifa_family = AF_INET6;
3424 ifm->ifa_prefixlen = prefixlen;
3425 ifm->ifa_flags = flags;
3426 ifm->ifa_scope = scope;
3427 ifm->ifa_index = ifindex;
3428 }
3429
3430 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3431 unsigned long tstamp, u32 preferred, u32 valid)
3432 {
3433 struct ifa_cacheinfo ci;
3434
3435 ci.cstamp = cstamp_delta(cstamp);
3436 ci.tstamp = cstamp_delta(tstamp);
3437 ci.ifa_prefered = preferred;
3438 ci.ifa_valid = valid;
3439
3440 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3441 }
3442
3443 static inline int rt_scope(int ifa_scope)
3444 {
3445 if (ifa_scope & IFA_HOST)
3446 return RT_SCOPE_HOST;
3447 else if (ifa_scope & IFA_LINK)
3448 return RT_SCOPE_LINK;
3449 else if (ifa_scope & IFA_SITE)
3450 return RT_SCOPE_SITE;
3451 else
3452 return RT_SCOPE_UNIVERSE;
3453 }
3454
3455 static inline int inet6_ifaddr_msgsize(void)
3456 {
3457 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3458 + nla_total_size(16) /* IFA_ADDRESS */
3459 + nla_total_size(sizeof(struct ifa_cacheinfo));
3460 }
3461
3462 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3463 u32 pid, u32 seq, int event, unsigned int flags)
3464 {
3465 struct nlmsghdr *nlh;
3466 u32 preferred, valid;
3467
3468 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3469 if (nlh == NULL)
3470 return -EMSGSIZE;
3471
3472 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3473 ifa->idev->dev->ifindex);
3474
3475 if (!(ifa->flags&IFA_F_PERMANENT)) {
3476 preferred = ifa->prefered_lft;
3477 valid = ifa->valid_lft;
3478 if (preferred != INFINITY_LIFE_TIME) {
3479 long tval = (jiffies - ifa->tstamp)/HZ;
3480 if (preferred > tval)
3481 preferred -= tval;
3482 else
3483 preferred = 0;
3484 if (valid != INFINITY_LIFE_TIME) {
3485 if (valid > tval)
3486 valid -= tval;
3487 else
3488 valid = 0;
3489 }
3490 }
3491 } else {
3492 preferred = INFINITY_LIFE_TIME;
3493 valid = INFINITY_LIFE_TIME;
3494 }
3495
3496 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3497 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3498 nlmsg_cancel(skb, nlh);
3499 return -EMSGSIZE;
3500 }
3501
3502 return nlmsg_end(skb, nlh);
3503 }
3504
3505 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3506 u32 pid, u32 seq, int event, u16 flags)
3507 {
3508 struct nlmsghdr *nlh;
3509 u8 scope = RT_SCOPE_UNIVERSE;
3510 int ifindex = ifmca->idev->dev->ifindex;
3511
3512 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3513 scope = RT_SCOPE_SITE;
3514
3515 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3516 if (nlh == NULL)
3517 return -EMSGSIZE;
3518
3519 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3520 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3521 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3522 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3523 nlmsg_cancel(skb, nlh);
3524 return -EMSGSIZE;
3525 }
3526
3527 return nlmsg_end(skb, nlh);
3528 }
3529
3530 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3531 u32 pid, u32 seq, int event, unsigned int flags)
3532 {
3533 struct nlmsghdr *nlh;
3534 u8 scope = RT_SCOPE_UNIVERSE;
3535 int ifindex = ifaca->aca_idev->dev->ifindex;
3536
3537 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3538 scope = RT_SCOPE_SITE;
3539
3540 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3541 if (nlh == NULL)
3542 return -EMSGSIZE;
3543
3544 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3545 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3546 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3547 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3548 nlmsg_cancel(skb, nlh);
3549 return -EMSGSIZE;
3550 }
3551
3552 return nlmsg_end(skb, nlh);
3553 }
3554
3555 enum addr_type_t {
3556 UNICAST_ADDR,
3557 MULTICAST_ADDR,
3558 ANYCAST_ADDR,
3559 };
3560
3561 /* called with rcu_read_lock() */
3562 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3563 struct netlink_callback *cb, enum addr_type_t type,
3564 int s_ip_idx, int *p_ip_idx)
3565 {
3566 struct ifmcaddr6 *ifmca;
3567 struct ifacaddr6 *ifaca;
3568 int err = 1;
3569 int ip_idx = *p_ip_idx;
3570
3571 read_lock_bh(&idev->lock);
3572 switch (type) {
3573 case UNICAST_ADDR: {
3574 struct inet6_ifaddr *ifa;
3575
3576 /* unicast address incl. temp addr */
3577 list_for_each_entry(ifa, &idev->addr_list, if_list) {
3578 if (++ip_idx < s_ip_idx)
3579 continue;
3580 err = inet6_fill_ifaddr(skb, ifa,
3581 NETLINK_CB(cb->skb).pid,
3582 cb->nlh->nlmsg_seq,
3583 RTM_NEWADDR,
3584 NLM_F_MULTI);
3585 if (err <= 0)
3586 break;
3587 }
3588 break;
3589 }
3590 case MULTICAST_ADDR:
3591 /* multicast address */
3592 for (ifmca = idev->mc_list; ifmca;
3593 ifmca = ifmca->next, ip_idx++) {
3594 if (ip_idx < s_ip_idx)
3595 continue;
3596 err = inet6_fill_ifmcaddr(skb, ifmca,
3597 NETLINK_CB(cb->skb).pid,
3598 cb->nlh->nlmsg_seq,
3599 RTM_GETMULTICAST,
3600 NLM_F_MULTI);
3601 if (err <= 0)
3602 break;
3603 }
3604 break;
3605 case ANYCAST_ADDR:
3606 /* anycast address */
3607 for (ifaca = idev->ac_list; ifaca;
3608 ifaca = ifaca->aca_next, ip_idx++) {
3609 if (ip_idx < s_ip_idx)
3610 continue;
3611 err = inet6_fill_ifacaddr(skb, ifaca,
3612 NETLINK_CB(cb->skb).pid,
3613 cb->nlh->nlmsg_seq,
3614 RTM_GETANYCAST,
3615 NLM_F_MULTI);
3616 if (err <= 0)
3617 break;
3618 }
3619 break;
3620 default:
3621 break;
3622 }
3623 read_unlock_bh(&idev->lock);
3624 *p_ip_idx = ip_idx;
3625 return err;
3626 }
3627
3628 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3629 enum addr_type_t type)
3630 {
3631 struct net *net = sock_net(skb->sk);
3632 int h, s_h;
3633 int idx, ip_idx;
3634 int s_idx, s_ip_idx;
3635 struct net_device *dev;
3636 struct inet6_dev *idev;
3637 struct hlist_head *head;
3638 struct hlist_node *node;
3639
3640 s_h = cb->args[0];
3641 s_idx = idx = cb->args[1];
3642 s_ip_idx = ip_idx = cb->args[2];
3643
3644 rcu_read_lock();
3645 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3646 idx = 0;
3647 head = &net->dev_index_head[h];
3648 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3649 if (idx < s_idx)
3650 goto cont;
3651 if (h > s_h || idx > s_idx)
3652 s_ip_idx = 0;
3653 ip_idx = 0;
3654 idev = __in6_dev_get(dev);
3655 if (!idev)
3656 goto cont;
3657
3658 if (in6_dump_addrs(idev, skb, cb, type,
3659 s_ip_idx, &ip_idx) <= 0)
3660 goto done;
3661 cont:
3662 idx++;
3663 }
3664 }
3665 done:
3666 rcu_read_unlock();
3667 cb->args[0] = h;
3668 cb->args[1] = idx;
3669 cb->args[2] = ip_idx;
3670
3671 return skb->len;
3672 }
3673
3674 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3675 {
3676 enum addr_type_t type = UNICAST_ADDR;
3677
3678 return inet6_dump_addr(skb, cb, type);
3679 }
3680
3681 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3682 {
3683 enum addr_type_t type = MULTICAST_ADDR;
3684
3685 return inet6_dump_addr(skb, cb, type);
3686 }
3687
3688
3689 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3690 {
3691 enum addr_type_t type = ANYCAST_ADDR;
3692
3693 return inet6_dump_addr(skb, cb, type);
3694 }
3695
3696 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3697 void *arg)
3698 {
3699 struct net *net = sock_net(in_skb->sk);
3700 struct ifaddrmsg *ifm;
3701 struct nlattr *tb[IFA_MAX+1];
3702 struct in6_addr *addr = NULL;
3703 struct net_device *dev = NULL;
3704 struct inet6_ifaddr *ifa;
3705 struct sk_buff *skb;
3706 int err;
3707
3708 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3709 if (err < 0)
3710 goto errout;
3711
3712 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3713 if (addr == NULL) {
3714 err = -EINVAL;
3715 goto errout;
3716 }
3717
3718 ifm = nlmsg_data(nlh);
3719 if (ifm->ifa_index)
3720 dev = __dev_get_by_index(net, ifm->ifa_index);
3721
3722 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
3723 if (!ifa) {
3724 err = -EADDRNOTAVAIL;
3725 goto errout;
3726 }
3727
3728 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
3729 if (!skb) {
3730 err = -ENOBUFS;
3731 goto errout_ifa;
3732 }
3733
3734 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3735 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3736 if (err < 0) {
3737 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3738 WARN_ON(err == -EMSGSIZE);
3739 kfree_skb(skb);
3740 goto errout_ifa;
3741 }
3742 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
3743 errout_ifa:
3744 in6_ifa_put(ifa);
3745 errout:
3746 return err;
3747 }
3748
3749 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3750 {
3751 struct sk_buff *skb;
3752 struct net *net = dev_net(ifa->idev->dev);
3753 int err = -ENOBUFS;
3754
3755 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3756 if (skb == NULL)
3757 goto errout;
3758
3759 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3760 if (err < 0) {
3761 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3762 WARN_ON(err == -EMSGSIZE);
3763 kfree_skb(skb);
3764 goto errout;
3765 }
3766 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3767 return;
3768 errout:
3769 if (err < 0)
3770 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3771 }
3772
3773 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3774 __s32 *array, int bytes)
3775 {
3776 BUG_ON(bytes < (DEVCONF_MAX * 4));
3777
3778 memset(array, 0, bytes);
3779 array[DEVCONF_FORWARDING] = cnf->forwarding;
3780 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3781 array[DEVCONF_MTU6] = cnf->mtu6;
3782 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3783 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3784 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3785 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3786 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3787 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
3788 jiffies_to_msecs(cnf->rtr_solicit_interval);
3789 array[DEVCONF_RTR_SOLICIT_DELAY] =
3790 jiffies_to_msecs(cnf->rtr_solicit_delay);
3791 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3792 #ifdef CONFIG_IPV6_PRIVACY
3793 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3794 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3795 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3796 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3797 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3798 #endif
3799 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3800 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3801 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3802 #ifdef CONFIG_IPV6_ROUTER_PREF
3803 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3804 array[DEVCONF_RTR_PROBE_INTERVAL] =
3805 jiffies_to_msecs(cnf->rtr_probe_interval);
3806 #ifdef CONFIG_IPV6_ROUTE_INFO
3807 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3808 #endif
3809 #endif
3810 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3811 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3812 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3813 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3814 #endif
3815 #ifdef CONFIG_IPV6_MROUTE
3816 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
3817 #endif
3818 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
3819 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
3820 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
3821 }
3822
3823 static inline size_t inet6_ifla6_size(void)
3824 {
3825 return nla_total_size(4) /* IFLA_INET6_FLAGS */
3826 + nla_total_size(sizeof(struct ifla_cacheinfo))
3827 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3828 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3829 + nla_total_size(ICMP6_MIB_MAX * 8); /* IFLA_INET6_ICMP6STATS */
3830 }
3831
3832 static inline size_t inet6_if_nlmsg_size(void)
3833 {
3834 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3835 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3836 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3837 + nla_total_size(4) /* IFLA_MTU */
3838 + nla_total_size(4) /* IFLA_LINK */
3839 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
3840 }
3841
3842 static inline void __snmp6_fill_stats(u64 *stats, void __percpu **mib,
3843 int items, int bytes)
3844 {
3845 int i;
3846 int pad = bytes - sizeof(u64) * items;
3847 BUG_ON(pad < 0);
3848
3849 /* Use put_unaligned() because stats may not be aligned for u64. */
3850 put_unaligned(items, &stats[0]);
3851 for (i = 1; i < items; i++)
3852 put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3853
3854 memset(&stats[items], 0, pad);
3855 }
3856
3857 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib,
3858 int items, int bytes, size_t syncpoff)
3859 {
3860 int i;
3861 int pad = bytes - sizeof(u64) * items;
3862 BUG_ON(pad < 0);
3863
3864 /* Use put_unaligned() because stats may not be aligned for u64. */
3865 put_unaligned(items, &stats[0]);
3866 for (i = 1; i < items; i++)
3867 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
3868
3869 memset(&stats[items], 0, pad);
3870 }
3871
3872 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3873 int bytes)
3874 {
3875 switch (attrtype) {
3876 case IFLA_INET6_STATS:
3877 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6,
3878 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
3879 break;
3880 case IFLA_INET6_ICMP6STATS:
3881 __snmp6_fill_stats(stats, (void __percpu **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
3882 break;
3883 }
3884 }
3885
3886 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
3887 {
3888 struct nlattr *nla;
3889 struct ifla_cacheinfo ci;
3890
3891 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
3892
3893 ci.max_reasm_len = IPV6_MAXPLEN;
3894 ci.tstamp = cstamp_delta(idev->tstamp);
3895 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
3896 ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time);
3897 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3898
3899 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3900 if (nla == NULL)
3901 goto nla_put_failure;
3902 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
3903
3904 /* XXX - MC not implemented */
3905
3906 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3907 if (nla == NULL)
3908 goto nla_put_failure;
3909 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3910
3911 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3912 if (nla == NULL)
3913 goto nla_put_failure;
3914 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
3915
3916 return 0;
3917
3918 nla_put_failure:
3919 return -EMSGSIZE;
3920 }
3921
3922 static size_t inet6_get_link_af_size(const struct net_device *dev)
3923 {
3924 if (!__in6_dev_get(dev))
3925 return 0;
3926
3927 return inet6_ifla6_size();
3928 }
3929
3930 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
3931 {
3932 struct inet6_dev *idev = __in6_dev_get(dev);
3933
3934 if (!idev)
3935 return -ENODATA;
3936
3937 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
3938 return -EMSGSIZE;
3939
3940 return 0;
3941 }
3942
3943 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3944 u32 pid, u32 seq, int event, unsigned int flags)
3945 {
3946 struct net_device *dev = idev->dev;
3947 struct ifinfomsg *hdr;
3948 struct nlmsghdr *nlh;
3949 void *protoinfo;
3950
3951 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3952 if (nlh == NULL)
3953 return -EMSGSIZE;
3954
3955 hdr = nlmsg_data(nlh);
3956 hdr->ifi_family = AF_INET6;
3957 hdr->__ifi_pad = 0;
3958 hdr->ifi_type = dev->type;
3959 hdr->ifi_index = dev->ifindex;
3960 hdr->ifi_flags = dev_get_flags(dev);
3961 hdr->ifi_change = 0;
3962
3963 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
3964
3965 if (dev->addr_len)
3966 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3967
3968 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
3969 if (dev->ifindex != dev->iflink)
3970 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
3971
3972 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3973 if (protoinfo == NULL)
3974 goto nla_put_failure;
3975
3976 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
3977 goto nla_put_failure;
3978
3979 nla_nest_end(skb, protoinfo);
3980 return nlmsg_end(skb, nlh);
3981
3982 nla_put_failure:
3983 nlmsg_cancel(skb, nlh);
3984 return -EMSGSIZE;
3985 }
3986
3987 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3988 {
3989 struct net *net = sock_net(skb->sk);
3990 int h, s_h;
3991 int idx = 0, s_idx;
3992 struct net_device *dev;
3993 struct inet6_dev *idev;
3994 struct hlist_head *head;
3995 struct hlist_node *node;
3996
3997 s_h = cb->args[0];
3998 s_idx = cb->args[1];
3999
4000 rcu_read_lock();
4001 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4002 idx = 0;
4003 head = &net->dev_index_head[h];
4004 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
4005 if (idx < s_idx)
4006 goto cont;
4007 idev = __in6_dev_get(dev);
4008 if (!idev)
4009 goto cont;
4010 if (inet6_fill_ifinfo(skb, idev,
4011 NETLINK_CB(cb->skb).pid,
4012 cb->nlh->nlmsg_seq,
4013 RTM_NEWLINK, NLM_F_MULTI) <= 0)
4014 goto out;
4015 cont:
4016 idx++;
4017 }
4018 }
4019 out:
4020 rcu_read_unlock();
4021 cb->args[1] = idx;
4022 cb->args[0] = h;
4023
4024 return skb->len;
4025 }
4026
4027 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4028 {
4029 struct sk_buff *skb;
4030 struct net *net = dev_net(idev->dev);
4031 int err = -ENOBUFS;
4032
4033 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
4034 if (skb == NULL)
4035 goto errout;
4036
4037 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
4038 if (err < 0) {
4039 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4040 WARN_ON(err == -EMSGSIZE);
4041 kfree_skb(skb);
4042 goto errout;
4043 }
4044 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
4045 return;
4046 errout:
4047 if (err < 0)
4048 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
4049 }
4050
4051 static inline size_t inet6_prefix_nlmsg_size(void)
4052 {
4053 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4054 + nla_total_size(sizeof(struct in6_addr))
4055 + nla_total_size(sizeof(struct prefix_cacheinfo));
4056 }
4057
4058 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
4059 struct prefix_info *pinfo, u32 pid, u32 seq,
4060 int event, unsigned int flags)
4061 {
4062 struct prefixmsg *pmsg;
4063 struct nlmsghdr *nlh;
4064 struct prefix_cacheinfo ci;
4065
4066 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
4067 if (nlh == NULL)
4068 return -EMSGSIZE;
4069
4070 pmsg = nlmsg_data(nlh);
4071 pmsg->prefix_family = AF_INET6;
4072 pmsg->prefix_pad1 = 0;
4073 pmsg->prefix_pad2 = 0;
4074 pmsg->prefix_ifindex = idev->dev->ifindex;
4075 pmsg->prefix_len = pinfo->prefix_len;
4076 pmsg->prefix_type = pinfo->type;
4077 pmsg->prefix_pad3 = 0;
4078 pmsg->prefix_flags = 0;
4079 if (pinfo->onlink)
4080 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4081 if (pinfo->autoconf)
4082 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4083
4084 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
4085
4086 ci.preferred_time = ntohl(pinfo->prefered);
4087 ci.valid_time = ntohl(pinfo->valid);
4088 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
4089
4090 return nlmsg_end(skb, nlh);
4091
4092 nla_put_failure:
4093 nlmsg_cancel(skb, nlh);
4094 return -EMSGSIZE;
4095 }
4096
4097 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
4098 struct prefix_info *pinfo)
4099 {
4100 struct sk_buff *skb;
4101 struct net *net = dev_net(idev->dev);
4102 int err = -ENOBUFS;
4103
4104 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
4105 if (skb == NULL)
4106 goto errout;
4107
4108 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
4109 if (err < 0) {
4110 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4111 WARN_ON(err == -EMSGSIZE);
4112 kfree_skb(skb);
4113 goto errout;
4114 }
4115 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4116 return;
4117 errout:
4118 if (err < 0)
4119 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
4120 }
4121
4122 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4123 {
4124 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4125
4126 switch (event) {
4127 case RTM_NEWADDR:
4128 /*
4129 * If the address was optimistic
4130 * we inserted the route at the start of
4131 * our DAD process, so we don't need
4132 * to do it again
4133 */
4134 if (!(ifp->rt->rt6i_node))
4135 ip6_ins_rt(ifp->rt);
4136 if (ifp->idev->cnf.forwarding)
4137 addrconf_join_anycast(ifp);
4138 break;
4139 case RTM_DELADDR:
4140 if (ifp->idev->cnf.forwarding)
4141 addrconf_leave_anycast(ifp);
4142 addrconf_leave_solict(ifp->idev, &ifp->addr);
4143 dst_hold(&ifp->rt->dst);
4144
4145 if (ip6_del_rt(ifp->rt))
4146 dst_free(&ifp->rt->dst);
4147 break;
4148 }
4149 }
4150
4151 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4152 {
4153 rcu_read_lock_bh();
4154 if (likely(ifp->idev->dead == 0))
4155 __ipv6_ifa_notify(event, ifp);
4156 rcu_read_unlock_bh();
4157 }
4158
4159 #ifdef CONFIG_SYSCTL
4160
4161 static
4162 int addrconf_sysctl_forward(ctl_table *ctl, int write,
4163 void __user *buffer, size_t *lenp, loff_t *ppos)
4164 {
4165 int *valp = ctl->data;
4166 int val = *valp;
4167 loff_t pos = *ppos;
4168 int ret;
4169
4170 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
4171
4172 if (write)
4173 ret = addrconf_fixup_forwarding(ctl, valp, val);
4174 if (ret)
4175 *ppos = pos;
4176 return ret;
4177 }
4178
4179 static void dev_disable_change(struct inet6_dev *idev)
4180 {
4181 if (!idev || !idev->dev)
4182 return;
4183
4184 if (idev->cnf.disable_ipv6)
4185 addrconf_notify(NULL, NETDEV_DOWN, idev->dev);
4186 else
4187 addrconf_notify(NULL, NETDEV_UP, idev->dev);
4188 }
4189
4190 static void addrconf_disable_change(struct net *net, __s32 newf)
4191 {
4192 struct net_device *dev;
4193 struct inet6_dev *idev;
4194
4195 rcu_read_lock();
4196 for_each_netdev_rcu(net, dev) {
4197 idev = __in6_dev_get(dev);
4198 if (idev) {
4199 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4200 idev->cnf.disable_ipv6 = newf;
4201 if (changed)
4202 dev_disable_change(idev);
4203 }
4204 }
4205 rcu_read_unlock();
4206 }
4207
4208 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int old)
4209 {
4210 struct net *net;
4211
4212 net = (struct net *)table->extra2;
4213
4214 if (p == &net->ipv6.devconf_dflt->disable_ipv6)
4215 return 0;
4216
4217 if (!rtnl_trylock()) {
4218 /* Restore the original values before restarting */
4219 *p = old;
4220 return restart_syscall();
4221 }
4222
4223 if (p == &net->ipv6.devconf_all->disable_ipv6) {
4224 __s32 newf = net->ipv6.devconf_all->disable_ipv6;
4225 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4226 addrconf_disable_change(net, newf);
4227 } else if ((!*p) ^ (!old))
4228 dev_disable_change((struct inet6_dev *)table->extra1);
4229
4230 rtnl_unlock();
4231 return 0;
4232 }
4233
4234 static
4235 int addrconf_sysctl_disable(ctl_table *ctl, int write,
4236 void __user *buffer, size_t *lenp, loff_t *ppos)
4237 {
4238 int *valp = ctl->data;
4239 int val = *valp;
4240 loff_t pos = *ppos;
4241 int ret;
4242
4243 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
4244
4245 if (write)
4246 ret = addrconf_disable_ipv6(ctl, valp, val);
4247 if (ret)
4248 *ppos = pos;
4249 return ret;
4250 }
4251
4252 static struct addrconf_sysctl_table
4253 {
4254 struct ctl_table_header *sysctl_header;
4255 ctl_table addrconf_vars[DEVCONF_MAX+1];
4256 char *dev_name;
4257 } addrconf_sysctl __read_mostly = {
4258 .sysctl_header = NULL,
4259 .addrconf_vars = {
4260 {
4261 .procname = "forwarding",
4262 .data = &ipv6_devconf.forwarding,
4263 .maxlen = sizeof(int),
4264 .mode = 0644,
4265 .proc_handler = addrconf_sysctl_forward,
4266 },
4267 {
4268 .procname = "hop_limit",
4269 .data = &ipv6_devconf.hop_limit,
4270 .maxlen = sizeof(int),
4271 .mode = 0644,
4272 .proc_handler = proc_dointvec,
4273 },
4274 {
4275 .procname = "mtu",
4276 .data = &ipv6_devconf.mtu6,
4277 .maxlen = sizeof(int),
4278 .mode = 0644,
4279 .proc_handler = proc_dointvec,
4280 },
4281 {
4282 .procname = "accept_ra",
4283 .data = &ipv6_devconf.accept_ra,
4284 .maxlen = sizeof(int),
4285 .mode = 0644,
4286 .proc_handler = proc_dointvec,
4287 },
4288 {
4289 .procname = "accept_redirects",
4290 .data = &ipv6_devconf.accept_redirects,
4291 .maxlen = sizeof(int),
4292 .mode = 0644,
4293 .proc_handler = proc_dointvec,
4294 },
4295 {
4296 .procname = "autoconf",
4297 .data = &ipv6_devconf.autoconf,
4298 .maxlen = sizeof(int),
4299 .mode = 0644,
4300 .proc_handler = proc_dointvec,
4301 },
4302 {
4303 .procname = "dad_transmits",
4304 .data = &ipv6_devconf.dad_transmits,
4305 .maxlen = sizeof(int),
4306 .mode = 0644,
4307 .proc_handler = proc_dointvec,
4308 },
4309 {
4310 .procname = "router_solicitations",
4311 .data = &ipv6_devconf.rtr_solicits,
4312 .maxlen = sizeof(int),
4313 .mode = 0644,
4314 .proc_handler = proc_dointvec,
4315 },
4316 {
4317 .procname = "router_solicitation_interval",
4318 .data = &ipv6_devconf.rtr_solicit_interval,
4319 .maxlen = sizeof(int),
4320 .mode = 0644,
4321 .proc_handler = proc_dointvec_jiffies,
4322 },
4323 {
4324 .procname = "router_solicitation_delay",
4325 .data = &ipv6_devconf.rtr_solicit_delay,
4326 .maxlen = sizeof(int),
4327 .mode = 0644,
4328 .proc_handler = proc_dointvec_jiffies,
4329 },
4330 {
4331 .procname = "force_mld_version",
4332 .data = &ipv6_devconf.force_mld_version,
4333 .maxlen = sizeof(int),
4334 .mode = 0644,
4335 .proc_handler = proc_dointvec,
4336 },
4337 #ifdef CONFIG_IPV6_PRIVACY
4338 {
4339 .procname = "use_tempaddr",
4340 .data = &ipv6_devconf.use_tempaddr,
4341 .maxlen = sizeof(int),
4342 .mode = 0644,
4343 .proc_handler = proc_dointvec,
4344 },
4345 {
4346 .procname = "temp_valid_lft",
4347 .data = &ipv6_devconf.temp_valid_lft,
4348 .maxlen = sizeof(int),
4349 .mode = 0644,
4350 .proc_handler = proc_dointvec,
4351 },
4352 {
4353 .procname = "temp_prefered_lft",
4354 .data = &ipv6_devconf.temp_prefered_lft,
4355 .maxlen = sizeof(int),
4356 .mode = 0644,
4357 .proc_handler = proc_dointvec,
4358 },
4359 {
4360 .procname = "regen_max_retry",
4361 .data = &ipv6_devconf.regen_max_retry,
4362 .maxlen = sizeof(int),
4363 .mode = 0644,
4364 .proc_handler = proc_dointvec,
4365 },
4366 {
4367 .procname = "max_desync_factor",
4368 .data = &ipv6_devconf.max_desync_factor,
4369 .maxlen = sizeof(int),
4370 .mode = 0644,
4371 .proc_handler = proc_dointvec,
4372 },
4373 #endif
4374 {
4375 .procname = "max_addresses",
4376 .data = &ipv6_devconf.max_addresses,
4377 .maxlen = sizeof(int),
4378 .mode = 0644,
4379 .proc_handler = proc_dointvec,
4380 },
4381 {
4382 .procname = "accept_ra_defrtr",
4383 .data = &ipv6_devconf.accept_ra_defrtr,
4384 .maxlen = sizeof(int),
4385 .mode = 0644,
4386 .proc_handler = proc_dointvec,
4387 },
4388 {
4389 .procname = "accept_ra_pinfo",
4390 .data = &ipv6_devconf.accept_ra_pinfo,
4391 .maxlen = sizeof(int),
4392 .mode = 0644,
4393 .proc_handler = proc_dointvec,
4394 },
4395 #ifdef CONFIG_IPV6_ROUTER_PREF
4396 {
4397 .procname = "accept_ra_rtr_pref",
4398 .data = &ipv6_devconf.accept_ra_rtr_pref,
4399 .maxlen = sizeof(int),
4400 .mode = 0644,
4401 .proc_handler = proc_dointvec,
4402 },
4403 {
4404 .procname = "router_probe_interval",
4405 .data = &ipv6_devconf.rtr_probe_interval,
4406 .maxlen = sizeof(int),
4407 .mode = 0644,
4408 .proc_handler = proc_dointvec_jiffies,
4409 },
4410 #ifdef CONFIG_IPV6_ROUTE_INFO
4411 {
4412 .procname = "accept_ra_rt_info_max_plen",
4413 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4414 .maxlen = sizeof(int),
4415 .mode = 0644,
4416 .proc_handler = proc_dointvec,
4417 },
4418 #endif
4419 #endif
4420 {
4421 .procname = "proxy_ndp",
4422 .data = &ipv6_devconf.proxy_ndp,
4423 .maxlen = sizeof(int),
4424 .mode = 0644,
4425 .proc_handler = proc_dointvec,
4426 },
4427 {
4428 .procname = "accept_source_route",
4429 .data = &ipv6_devconf.accept_source_route,
4430 .maxlen = sizeof(int),
4431 .mode = 0644,
4432 .proc_handler = proc_dointvec,
4433 },
4434 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4435 {
4436 .procname = "optimistic_dad",
4437 .data = &ipv6_devconf.optimistic_dad,
4438 .maxlen = sizeof(int),
4439 .mode = 0644,
4440 .proc_handler = proc_dointvec,
4441
4442 },
4443 #endif
4444 #ifdef CONFIG_IPV6_MROUTE
4445 {
4446 .procname = "mc_forwarding",
4447 .data = &ipv6_devconf.mc_forwarding,
4448 .maxlen = sizeof(int),
4449 .mode = 0444,
4450 .proc_handler = proc_dointvec,
4451 },
4452 #endif
4453 {
4454 .procname = "disable_ipv6",
4455 .data = &ipv6_devconf.disable_ipv6,
4456 .maxlen = sizeof(int),
4457 .mode = 0644,
4458 .proc_handler = addrconf_sysctl_disable,
4459 },
4460 {
4461 .procname = "accept_dad",
4462 .data = &ipv6_devconf.accept_dad,
4463 .maxlen = sizeof(int),
4464 .mode = 0644,
4465 .proc_handler = proc_dointvec,
4466 },
4467 {
4468 .procname = "force_tllao",
4469 .data = &ipv6_devconf.force_tllao,
4470 .maxlen = sizeof(int),
4471 .mode = 0644,
4472 .proc_handler = proc_dointvec
4473 },
4474 {
4475 /* sentinel */
4476 }
4477 },
4478 };
4479
4480 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4481 struct inet6_dev *idev, struct ipv6_devconf *p)
4482 {
4483 int i;
4484 struct addrconf_sysctl_table *t;
4485
4486 #define ADDRCONF_CTL_PATH_DEV 3
4487
4488 struct ctl_path addrconf_ctl_path[] = {
4489 { .procname = "net", },
4490 { .procname = "ipv6", },
4491 { .procname = "conf", },
4492 { /* to be set */ },
4493 { },
4494 };
4495
4496
4497 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4498 if (t == NULL)
4499 goto out;
4500
4501 for (i = 0; t->addrconf_vars[i].data; i++) {
4502 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
4503 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4504 t->addrconf_vars[i].extra2 = net;
4505 }
4506
4507 /*
4508 * Make a copy of dev_name, because '.procname' is regarded as const
4509 * by sysctl and we wouldn't want anyone to change it under our feet
4510 * (see SIOCSIFNAME).
4511 */
4512 t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4513 if (!t->dev_name)
4514 goto free;
4515
4516 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
4517
4518 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
4519 t->addrconf_vars);
4520 if (t->sysctl_header == NULL)
4521 goto free_procname;
4522
4523 p->sysctl = t;
4524 return 0;
4525
4526 free_procname:
4527 kfree(t->dev_name);
4528 free:
4529 kfree(t);
4530 out:
4531 return -ENOBUFS;
4532 }
4533
4534 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4535 {
4536 struct addrconf_sysctl_table *t;
4537
4538 if (p->sysctl == NULL)
4539 return;
4540
4541 t = p->sysctl;
4542 p->sysctl = NULL;
4543 unregister_sysctl_table(t->sysctl_header);
4544 kfree(t->dev_name);
4545 kfree(t);
4546 }
4547
4548 static void addrconf_sysctl_register(struct inet6_dev *idev)
4549 {
4550 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
4551 &ndisc_ifinfo_sysctl_change);
4552 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
4553 idev, &idev->cnf);
4554 }
4555
4556 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
4557 {
4558 __addrconf_sysctl_unregister(&idev->cnf);
4559 neigh_sysctl_unregister(idev->nd_parms);
4560 }
4561
4562
4563 #endif
4564
4565 static int __net_init addrconf_init_net(struct net *net)
4566 {
4567 int err;
4568 struct ipv6_devconf *all, *dflt;
4569
4570 err = -ENOMEM;
4571 all = &ipv6_devconf;
4572 dflt = &ipv6_devconf_dflt;
4573
4574 if (!net_eq(net, &init_net)) {
4575 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4576 if (all == NULL)
4577 goto err_alloc_all;
4578
4579 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4580 if (dflt == NULL)
4581 goto err_alloc_dflt;
4582 } else {
4583 /* these will be inherited by all namespaces */
4584 dflt->autoconf = ipv6_defaults.autoconf;
4585 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
4586 }
4587
4588 net->ipv6.devconf_all = all;
4589 net->ipv6.devconf_dflt = dflt;
4590
4591 #ifdef CONFIG_SYSCTL
4592 err = __addrconf_sysctl_register(net, "all", NULL, all);
4593 if (err < 0)
4594 goto err_reg_all;
4595
4596 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
4597 if (err < 0)
4598 goto err_reg_dflt;
4599 #endif
4600 return 0;
4601
4602 #ifdef CONFIG_SYSCTL
4603 err_reg_dflt:
4604 __addrconf_sysctl_unregister(all);
4605 err_reg_all:
4606 kfree(dflt);
4607 #endif
4608 err_alloc_dflt:
4609 kfree(all);
4610 err_alloc_all:
4611 return err;
4612 }
4613
4614 static void __net_exit addrconf_exit_net(struct net *net)
4615 {
4616 #ifdef CONFIG_SYSCTL
4617 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4618 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4619 #endif
4620 if (!net_eq(net, &init_net)) {
4621 kfree(net->ipv6.devconf_dflt);
4622 kfree(net->ipv6.devconf_all);
4623 }
4624 }
4625
4626 static struct pernet_operations addrconf_ops = {
4627 .init = addrconf_init_net,
4628 .exit = addrconf_exit_net,
4629 };
4630
4631 /*
4632 * Device notifier
4633 */
4634
4635 int register_inet6addr_notifier(struct notifier_block *nb)
4636 {
4637 return atomic_notifier_chain_register(&inet6addr_chain, nb);
4638 }
4639 EXPORT_SYMBOL(register_inet6addr_notifier);
4640
4641 int unregister_inet6addr_notifier(struct notifier_block *nb)
4642 {
4643 return atomic_notifier_chain_unregister(&inet6addr_chain, nb);
4644 }
4645 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4646
4647 static struct rtnl_af_ops inet6_ops = {
4648 .family = AF_INET6,
4649 .fill_link_af = inet6_fill_link_af,
4650 .get_link_af_size = inet6_get_link_af_size,
4651 };
4652
4653 /*
4654 * Init / cleanup code
4655 */
4656
4657 int __init addrconf_init(void)
4658 {
4659 int i, err;
4660
4661 err = ipv6_addr_label_init();
4662 if (err < 0) {
4663 printk(KERN_CRIT "IPv6 Addrconf:"
4664 " cannot initialize default policy table: %d.\n", err);
4665 goto out;
4666 }
4667
4668 err = register_pernet_subsys(&addrconf_ops);
4669 if (err < 0)
4670 goto out_addrlabel;
4671
4672 /* The addrconf netdev notifier requires that loopback_dev
4673 * has it's ipv6 private information allocated and setup
4674 * before it can bring up and give link-local addresses
4675 * to other devices which are up.
4676 *
4677 * Unfortunately, loopback_dev is not necessarily the first
4678 * entry in the global dev_base list of net devices. In fact,
4679 * it is likely to be the very last entry on that list.
4680 * So this causes the notifier registry below to try and
4681 * give link-local addresses to all devices besides loopback_dev
4682 * first, then loopback_dev, which cases all the non-loopback_dev
4683 * devices to fail to get a link-local address.
4684 *
4685 * So, as a temporary fix, allocate the ipv6 structure for
4686 * loopback_dev first by hand.
4687 * Longer term, all of the dependencies ipv6 has upon the loopback
4688 * device and it being up should be removed.
4689 */
4690 rtnl_lock();
4691 if (!ipv6_add_dev(init_net.loopback_dev))
4692 err = -ENOMEM;
4693 rtnl_unlock();
4694 if (err)
4695 goto errlo;
4696
4697 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4698 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
4699
4700 register_netdevice_notifier(&ipv6_dev_notf);
4701
4702 addrconf_verify(0);
4703
4704 err = rtnl_af_register(&inet6_ops);
4705 if (err < 0)
4706 goto errout_af;
4707
4708 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4709 if (err < 0)
4710 goto errout;
4711
4712 /* Only the first call to __rtnl_register can fail */
4713 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4714 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4715 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4716 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4717 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4718
4719 ipv6_addr_label_rtnl_register();
4720
4721 return 0;
4722 errout:
4723 rtnl_af_unregister(&inet6_ops);
4724 errout_af:
4725 unregister_netdevice_notifier(&ipv6_dev_notf);
4726 errlo:
4727 unregister_pernet_subsys(&addrconf_ops);
4728 out_addrlabel:
4729 ipv6_addr_label_cleanup();
4730 out:
4731 return err;
4732 }
4733
4734 void addrconf_cleanup(void)
4735 {
4736 struct net_device *dev;
4737 int i;
4738
4739 unregister_netdevice_notifier(&ipv6_dev_notf);
4740 unregister_pernet_subsys(&addrconf_ops);
4741 ipv6_addr_label_cleanup();
4742
4743 rtnl_lock();
4744
4745 __rtnl_af_unregister(&inet6_ops);
4746
4747 /* clean dev list */
4748 for_each_netdev(&init_net, dev) {
4749 if (__in6_dev_get(dev) == NULL)
4750 continue;
4751 addrconf_ifdown(dev, 1);
4752 }
4753 addrconf_ifdown(init_net.loopback_dev, 2);
4754
4755 /*
4756 * Check hash table.
4757 */
4758 spin_lock_bh(&addrconf_hash_lock);
4759 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4760 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
4761 spin_unlock_bh(&addrconf_hash_lock);
4762
4763 del_timer(&addr_chk_timer);
4764 rtnl_unlock();
4765 }
Linux kernel - Deliverables
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