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ipv6: don't flush routes when setting loopback down
[linux-2.6/btrfs-unstable.git] / net / ipv6 / addrconf.c
blob848b355910424e75d42df6b9218eae3824ee213c
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 printk(KERN_INFO
424 "%s: Disabled Privacy Extensions\n",
425 dev->name);
426 ndev->cnf.use_tempaddr = -1;
427 } else {
428 in6_dev_hold(ndev);
429 ipv6_regen_rndid((unsigned long) ndev);
430 }
431 #endif
432
433 if (netif_running(dev) && addrconf_qdisc_ok(dev))
434 ndev->if_flags |= IF_READY;
435
436 ipv6_mc_init_dev(ndev);
437 ndev->tstamp = jiffies;
438 addrconf_sysctl_register(ndev);
439 /* protected by rtnl_lock */
440 rcu_assign_pointer(dev->ip6_ptr, ndev);
441
442 /* Join all-node multicast group */
443 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
444
445 return ndev;
446 }
447
448 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
449 {
450 struct inet6_dev *idev;
451
452 ASSERT_RTNL();
453
454 idev = __in6_dev_get(dev);
455 if (!idev) {
456 idev = ipv6_add_dev(dev);
457 if (!idev)
458 return NULL;
459 }
460
461 if (dev->flags&IFF_UP)
462 ipv6_mc_up(idev);
463 return idev;
464 }
465
466 #ifdef CONFIG_SYSCTL
467 static void dev_forward_change(struct inet6_dev *idev)
468 {
469 struct net_device *dev;
470 struct inet6_ifaddr *ifa;
471
472 if (!idev)
473 return;
474 dev = idev->dev;
475 if (idev->cnf.forwarding)
476 dev_disable_lro(dev);
477 if (dev && (dev->flags & IFF_MULTICAST)) {
478 if (idev->cnf.forwarding)
479 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
480 else
481 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
482 }
483
484 list_for_each_entry(ifa, &idev->addr_list, if_list) {
485 if (ifa->flags&IFA_F_TENTATIVE)
486 continue;
487 if (idev->cnf.forwarding)
488 addrconf_join_anycast(ifa);
489 else
490 addrconf_leave_anycast(ifa);
491 }
492 }
493
494
495 static void addrconf_forward_change(struct net *net, __s32 newf)
496 {
497 struct net_device *dev;
498 struct inet6_dev *idev;
499
500 rcu_read_lock();
501 for_each_netdev_rcu(net, dev) {
502 idev = __in6_dev_get(dev);
503 if (idev) {
504 int changed = (!idev->cnf.forwarding) ^ (!newf);
505 idev->cnf.forwarding = newf;
506 if (changed)
507 dev_forward_change(idev);
508 }
509 }
510 rcu_read_unlock();
511 }
512
513 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old)
514 {
515 struct net *net;
516
517 net = (struct net *)table->extra2;
518 if (p == &net->ipv6.devconf_dflt->forwarding)
519 return 0;
520
521 if (!rtnl_trylock()) {
522 /* Restore the original values before restarting */
523 *p = old;
524 return restart_syscall();
525 }
526
527 if (p == &net->ipv6.devconf_all->forwarding) {
528 __s32 newf = net->ipv6.devconf_all->forwarding;
529 net->ipv6.devconf_dflt->forwarding = newf;
530 addrconf_forward_change(net, newf);
531 } else if ((!*p) ^ (!old))
532 dev_forward_change((struct inet6_dev *)table->extra1);
533 rtnl_unlock();
534
535 if (*p)
536 rt6_purge_dflt_routers(net);
537 return 1;
538 }
539 #endif
540
541 static void inet6_ifa_finish_destroy_rcu(struct rcu_head *head)
542 {
543 struct inet6_ifaddr *ifp = container_of(head, struct inet6_ifaddr, rcu);
544 kfree(ifp);
545 }
546
547 /* Nobody refers to this ifaddr, destroy it */
548 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
549 {
550 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
551
552 #ifdef NET_REFCNT_DEBUG
553 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
554 #endif
555
556 in6_dev_put(ifp->idev);
557
558 if (del_timer(&ifp->timer))
559 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp);
560
561 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
562 pr_warning("Freeing alive inet6 address %p\n", ifp);
563 return;
564 }
565 dst_release(&ifp->rt->dst);
566
567 call_rcu(&ifp->rcu, inet6_ifa_finish_destroy_rcu);
568 }
569
570 static void
571 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
572 {
573 struct list_head *p;
574 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
575
576 /*
577 * Each device address list is sorted in order of scope -
578 * global before linklocal.
579 */
580 list_for_each(p, &idev->addr_list) {
581 struct inet6_ifaddr *ifa
582 = list_entry(p, struct inet6_ifaddr, if_list);
583 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
584 break;
585 }
586
587 list_add_tail(&ifp->if_list, p);
588 }
589
590 static u32 ipv6_addr_hash(const struct in6_addr *addr)
591 {
592 /*
593 * We perform the hash function over the last 64 bits of the address
594 * This will include the IEEE address token on links that support it.
595 */
596 return jhash_2words((__force u32)addr->s6_addr32[2],
597 (__force u32)addr->s6_addr32[3], 0)
598 & (IN6_ADDR_HSIZE - 1);
599 }
600
601 /* On success it returns ifp with increased reference count */
602
603 static struct inet6_ifaddr *
604 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
605 int scope, u32 flags)
606 {
607 struct inet6_ifaddr *ifa = NULL;
608 struct rt6_info *rt;
609 unsigned int hash;
610 int err = 0;
611 int addr_type = ipv6_addr_type(addr);
612
613 if (addr_type == IPV6_ADDR_ANY ||
614 addr_type & IPV6_ADDR_MULTICAST ||
615 (!(idev->dev->flags & IFF_LOOPBACK) &&
616 addr_type & IPV6_ADDR_LOOPBACK))
617 return ERR_PTR(-EADDRNOTAVAIL);
618
619 rcu_read_lock_bh();
620 if (idev->dead) {
621 err = -ENODEV; /*XXX*/
622 goto out2;
623 }
624
625 if (idev->cnf.disable_ipv6) {
626 err = -EACCES;
627 goto out2;
628 }
629
630 spin_lock(&addrconf_hash_lock);
631
632 /* Ignore adding duplicate addresses on an interface */
633 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
634 ADBG(("ipv6_add_addr: already assigned\n"));
635 err = -EEXIST;
636 goto out;
637 }
638
639 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
640
641 if (ifa == NULL) {
642 ADBG(("ipv6_add_addr: malloc failed\n"));
643 err = -ENOBUFS;
644 goto out;
645 }
646
647 rt = addrconf_dst_alloc(idev, addr, 0);
648 if (IS_ERR(rt)) {
649 err = PTR_ERR(rt);
650 goto out;
651 }
652
653 ipv6_addr_copy(&ifa->addr, addr);
654
655 spin_lock_init(&ifa->lock);
656 spin_lock_init(&ifa->state_lock);
657 init_timer(&ifa->timer);
658 INIT_HLIST_NODE(&ifa->addr_lst);
659 ifa->timer.data = (unsigned long) ifa;
660 ifa->scope = scope;
661 ifa->prefix_len = pfxlen;
662 ifa->flags = flags | IFA_F_TENTATIVE;
663 ifa->cstamp = ifa->tstamp = jiffies;
664
665 ifa->rt = rt;
666
667 /*
668 * part one of RFC 4429, section 3.3
669 * We should not configure an address as
670 * optimistic if we do not yet know the link
671 * layer address of our nexhop router
672 */
673
674 if (rt->rt6i_nexthop == NULL)
675 ifa->flags &= ~IFA_F_OPTIMISTIC;
676
677 ifa->idev = idev;
678 in6_dev_hold(idev);
679 /* For caller */
680 in6_ifa_hold(ifa);
681
682 /* Add to big hash table */
683 hash = ipv6_addr_hash(addr);
684
685 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
686 spin_unlock(&addrconf_hash_lock);
687
688 write_lock(&idev->lock);
689 /* Add to inet6_dev unicast addr list. */
690 ipv6_link_dev_addr(idev, ifa);
691
692 #ifdef CONFIG_IPV6_PRIVACY
693 if (ifa->flags&IFA_F_TEMPORARY) {
694 list_add(&ifa->tmp_list, &idev->tempaddr_list);
695 in6_ifa_hold(ifa);
696 }
697 #endif
698
699 in6_ifa_hold(ifa);
700 write_unlock(&idev->lock);
701 out2:
702 rcu_read_unlock_bh();
703
704 if (likely(err == 0))
705 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
706 else {
707 kfree(ifa);
708 ifa = ERR_PTR(err);
709 }
710
711 return ifa;
712 out:
713 spin_unlock(&addrconf_hash_lock);
714 goto out2;
715 }
716
717 /* This function wants to get referenced ifp and releases it before return */
718
719 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
720 {
721 struct inet6_ifaddr *ifa, *ifn;
722 struct inet6_dev *idev = ifp->idev;
723 int state;
724 int hash;
725 int deleted = 0, onlink = 0;
726 unsigned long expires = jiffies;
727
728 hash = ipv6_addr_hash(&ifp->addr);
729
730 spin_lock_bh(&ifp->state_lock);
731 state = ifp->state;
732 ifp->state = INET6_IFADDR_STATE_DEAD;
733 spin_unlock_bh(&ifp->state_lock);
734
735 if (state == INET6_IFADDR_STATE_DEAD)
736 goto out;
737
738 spin_lock_bh(&addrconf_hash_lock);
739 hlist_del_init_rcu(&ifp->addr_lst);
740 spin_unlock_bh(&addrconf_hash_lock);
741
742 write_lock_bh(&idev->lock);
743 #ifdef CONFIG_IPV6_PRIVACY
744 if (ifp->flags&IFA_F_TEMPORARY) {
745 list_del(&ifp->tmp_list);
746 if (ifp->ifpub) {
747 in6_ifa_put(ifp->ifpub);
748 ifp->ifpub = NULL;
749 }
750 __in6_ifa_put(ifp);
751 }
752 #endif
753
754 list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) {
755 if (ifa == ifp) {
756 list_del_init(&ifp->if_list);
757 __in6_ifa_put(ifp);
758
759 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
760 break;
761 deleted = 1;
762 continue;
763 } else if (ifp->flags & IFA_F_PERMANENT) {
764 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
765 ifp->prefix_len)) {
766 if (ifa->flags & IFA_F_PERMANENT) {
767 onlink = 1;
768 if (deleted)
769 break;
770 } else {
771 unsigned long lifetime;
772
773 if (!onlink)
774 onlink = -1;
775
776 spin_lock(&ifa->lock);
777
778 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
779 /*
780 * Note: Because this address is
781 * not permanent, lifetime <
782 * LONG_MAX / HZ here.
783 */
784 if (time_before(expires,
785 ifa->tstamp + lifetime * HZ))
786 expires = ifa->tstamp + lifetime * HZ;
787 spin_unlock(&ifa->lock);
788 }
789 }
790 }
791 }
792 write_unlock_bh(&idev->lock);
793
794 addrconf_del_timer(ifp);
795
796 ipv6_ifa_notify(RTM_DELADDR, ifp);
797
798 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
799
800 /*
801 * Purge or update corresponding prefix
802 *
803 * 1) we don't purge prefix here if address was not permanent.
804 * prefix is managed by its own lifetime.
805 * 2) if there're no addresses, delete prefix.
806 * 3) if there're still other permanent address(es),
807 * corresponding prefix is still permanent.
808 * 4) otherwise, update prefix lifetime to the
809 * longest valid lifetime among the corresponding
810 * addresses on the device.
811 * Note: subsequent RA will update lifetime.
812 *
813 * --yoshfuji
814 */
815 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
816 struct in6_addr prefix;
817 struct rt6_info *rt;
818 struct net *net = dev_net(ifp->idev->dev);
819 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
820 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1);
821
822 if (rt && addrconf_is_prefix_route(rt)) {
823 if (onlink == 0) {
824 ip6_del_rt(rt);
825 rt = NULL;
826 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
827 rt->rt6i_expires = expires;
828 rt->rt6i_flags |= RTF_EXPIRES;
829 }
830 }
831 dst_release(&rt->dst);
832 }
833
834 out:
835 in6_ifa_put(ifp);
836 }
837
838 #ifdef CONFIG_IPV6_PRIVACY
839 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
840 {
841 struct inet6_dev *idev = ifp->idev;
842 struct in6_addr addr, *tmpaddr;
843 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp, age;
844 unsigned long regen_advance;
845 int tmp_plen;
846 int ret = 0;
847 int max_addresses;
848 u32 addr_flags;
849
850 write_lock(&idev->lock);
851 if (ift) {
852 spin_lock_bh(&ift->lock);
853 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
854 spin_unlock_bh(&ift->lock);
855 tmpaddr = &addr;
856 } else {
857 tmpaddr = NULL;
858 }
859 retry:
860 in6_dev_hold(idev);
861 if (idev->cnf.use_tempaddr <= 0) {
862 write_unlock(&idev->lock);
863 printk(KERN_INFO
864 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
865 in6_dev_put(idev);
866 ret = -1;
867 goto out;
868 }
869 spin_lock_bh(&ifp->lock);
870 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
871 idev->cnf.use_tempaddr = -1; /*XXX*/
872 spin_unlock_bh(&ifp->lock);
873 write_unlock(&idev->lock);
874 printk(KERN_WARNING
875 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
876 in6_dev_put(idev);
877 ret = -1;
878 goto out;
879 }
880 in6_ifa_hold(ifp);
881 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
882 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
883 spin_unlock_bh(&ifp->lock);
884 write_unlock(&idev->lock);
885 printk(KERN_WARNING
886 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
887 in6_ifa_put(ifp);
888 in6_dev_put(idev);
889 ret = -1;
890 goto out;
891 }
892 memcpy(&addr.s6_addr[8], idev->rndid, 8);
893 age = (jiffies - ifp->tstamp) / HZ;
894 tmp_valid_lft = min_t(__u32,
895 ifp->valid_lft,
896 idev->cnf.temp_valid_lft + age);
897 tmp_prefered_lft = min_t(__u32,
898 ifp->prefered_lft,
899 idev->cnf.temp_prefered_lft + age -
900 idev->cnf.max_desync_factor);
901 tmp_plen = ifp->prefix_len;
902 max_addresses = idev->cnf.max_addresses;
903 tmp_cstamp = ifp->cstamp;
904 tmp_tstamp = ifp->tstamp;
905 spin_unlock_bh(&ifp->lock);
906
907 regen_advance = idev->cnf.regen_max_retry *
908 idev->cnf.dad_transmits *
909 idev->nd_parms->retrans_time / HZ;
910 write_unlock(&idev->lock);
911
912 /* A temporary address is created only if this calculated Preferred
913 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
914 * an implementation must not create a temporary address with a zero
915 * Preferred Lifetime.
916 */
917 if (tmp_prefered_lft <= regen_advance) {
918 in6_ifa_put(ifp);
919 in6_dev_put(idev);
920 ret = -1;
921 goto out;
922 }
923
924 addr_flags = IFA_F_TEMPORARY;
925 /* set in addrconf_prefix_rcv() */
926 if (ifp->flags & IFA_F_OPTIMISTIC)
927 addr_flags |= IFA_F_OPTIMISTIC;
928
929 ift = !max_addresses ||
930 ipv6_count_addresses(idev) < max_addresses ?
931 ipv6_add_addr(idev, &addr, tmp_plen,
932 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
933 addr_flags) : NULL;
934 if (!ift || IS_ERR(ift)) {
935 in6_ifa_put(ifp);
936 in6_dev_put(idev);
937 printk(KERN_INFO
938 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
939 tmpaddr = &addr;
940 write_lock(&idev->lock);
941 goto retry;
942 }
943
944 spin_lock_bh(&ift->lock);
945 ift->ifpub = ifp;
946 ift->valid_lft = tmp_valid_lft;
947 ift->prefered_lft = tmp_prefered_lft;
948 ift->cstamp = tmp_cstamp;
949 ift->tstamp = tmp_tstamp;
950 spin_unlock_bh(&ift->lock);
951
952 addrconf_dad_start(ift, 0);
953 in6_ifa_put(ift);
954 in6_dev_put(idev);
955 out:
956 return ret;
957 }
958 #endif
959
960 /*
961 * Choose an appropriate source address (RFC3484)
962 */
963 enum {
964 IPV6_SADDR_RULE_INIT = 0,
965 IPV6_SADDR_RULE_LOCAL,
966 IPV6_SADDR_RULE_SCOPE,
967 IPV6_SADDR_RULE_PREFERRED,
968 #ifdef CONFIG_IPV6_MIP6
969 IPV6_SADDR_RULE_HOA,
970 #endif
971 IPV6_SADDR_RULE_OIF,
972 IPV6_SADDR_RULE_LABEL,
973 #ifdef CONFIG_IPV6_PRIVACY
974 IPV6_SADDR_RULE_PRIVACY,
975 #endif
976 IPV6_SADDR_RULE_ORCHID,
977 IPV6_SADDR_RULE_PREFIX,
978 IPV6_SADDR_RULE_MAX
979 };
980
981 struct ipv6_saddr_score {
982 int rule;
983 int addr_type;
984 struct inet6_ifaddr *ifa;
985 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
986 int scopedist;
987 int matchlen;
988 };
989
990 struct ipv6_saddr_dst {
991 const struct in6_addr *addr;
992 int ifindex;
993 int scope;
994 int label;
995 unsigned int prefs;
996 };
997
998 static inline int ipv6_saddr_preferred(int type)
999 {
1000 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1001 return 1;
1002 return 0;
1003 }
1004
1005 static int ipv6_get_saddr_eval(struct net *net,
1006 struct ipv6_saddr_score *score,
1007 struct ipv6_saddr_dst *dst,
1008 int i)
1009 {
1010 int ret;
1011
1012 if (i <= score->rule) {
1013 switch (i) {
1014 case IPV6_SADDR_RULE_SCOPE:
1015 ret = score->scopedist;
1016 break;
1017 case IPV6_SADDR_RULE_PREFIX:
1018 ret = score->matchlen;
1019 break;
1020 default:
1021 ret = !!test_bit(i, score->scorebits);
1022 }
1023 goto out;
1024 }
1025
1026 switch (i) {
1027 case IPV6_SADDR_RULE_INIT:
1028 /* Rule 0: remember if hiscore is not ready yet */
1029 ret = !!score->ifa;
1030 break;
1031 case IPV6_SADDR_RULE_LOCAL:
1032 /* Rule 1: Prefer same address */
1033 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1034 break;
1035 case IPV6_SADDR_RULE_SCOPE:
1036 /* Rule 2: Prefer appropriate scope
1037 *
1038 * ret
1039 * ^
1040 * -1 | d 15
1041 * ---+--+-+---> scope
1042 * |
1043 * | d is scope of the destination.
1044 * B-d | \
1045 * | \ <- smaller scope is better if
1046 * B-15 | \ if scope is enough for destinaion.
1047 * | ret = B - scope (-1 <= scope >= d <= 15).
1048 * d-C-1 | /
1049 * |/ <- greater is better
1050 * -C / if scope is not enough for destination.
1051 * /| ret = scope - C (-1 <= d < scope <= 15).
1052 *
1053 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1054 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1055 * Assume B = 0 and we get C > 29.
1056 */
1057 ret = __ipv6_addr_src_scope(score->addr_type);
1058 if (ret >= dst->scope)
1059 ret = -ret;
1060 else
1061 ret -= 128; /* 30 is enough */
1062 score->scopedist = ret;
1063 break;
1064 case IPV6_SADDR_RULE_PREFERRED:
1065 /* Rule 3: Avoid deprecated and optimistic addresses */
1066 ret = ipv6_saddr_preferred(score->addr_type) ||
1067 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1068 break;
1069 #ifdef CONFIG_IPV6_MIP6
1070 case IPV6_SADDR_RULE_HOA:
1071 {
1072 /* Rule 4: Prefer home address */
1073 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1074 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1075 break;
1076 }
1077 #endif
1078 case IPV6_SADDR_RULE_OIF:
1079 /* Rule 5: Prefer outgoing interface */
1080 ret = (!dst->ifindex ||
1081 dst->ifindex == score->ifa->idev->dev->ifindex);
1082 break;
1083 case IPV6_SADDR_RULE_LABEL:
1084 /* Rule 6: Prefer matching label */
1085 ret = ipv6_addr_label(net,
1086 &score->ifa->addr, score->addr_type,
1087 score->ifa->idev->dev->ifindex) == dst->label;
1088 break;
1089 #ifdef CONFIG_IPV6_PRIVACY
1090 case IPV6_SADDR_RULE_PRIVACY:
1091 {
1092 /* Rule 7: Prefer public address
1093 * Note: prefer temprary address if use_tempaddr >= 2
1094 */
1095 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1096 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1097 score->ifa->idev->cnf.use_tempaddr >= 2;
1098 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1099 break;
1100 }
1101 #endif
1102 case IPV6_SADDR_RULE_ORCHID:
1103 /* Rule 8-: Prefer ORCHID vs ORCHID or
1104 * non-ORCHID vs non-ORCHID
1105 */
1106 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1107 ipv6_addr_orchid(dst->addr));
1108 break;
1109 case IPV6_SADDR_RULE_PREFIX:
1110 /* Rule 8: Use longest matching prefix */
1111 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr,
1112 dst->addr);
1113 break;
1114 default:
1115 ret = 0;
1116 }
1117
1118 if (ret)
1119 __set_bit(i, score->scorebits);
1120 score->rule = i;
1121 out:
1122 return ret;
1123 }
1124
1125 int ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev,
1126 const struct in6_addr *daddr, unsigned int prefs,
1127 struct in6_addr *saddr)
1128 {
1129 struct ipv6_saddr_score scores[2],
1130 *score = &scores[0], *hiscore = &scores[1];
1131 struct ipv6_saddr_dst dst;
1132 struct net_device *dev;
1133 int dst_type;
1134
1135 dst_type = __ipv6_addr_type(daddr);
1136 dst.addr = daddr;
1137 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1138 dst.scope = __ipv6_addr_src_scope(dst_type);
1139 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1140 dst.prefs = prefs;
1141
1142 hiscore->rule = -1;
1143 hiscore->ifa = NULL;
1144
1145 rcu_read_lock();
1146
1147 for_each_netdev_rcu(net, dev) {
1148 struct inet6_dev *idev;
1149
1150 /* Candidate Source Address (section 4)
1151 * - multicast and link-local destination address,
1152 * the set of candidate source address MUST only
1153 * include addresses assigned to interfaces
1154 * belonging to the same link as the outgoing
1155 * interface.
1156 * (- For site-local destination addresses, the
1157 * set of candidate source addresses MUST only
1158 * include addresses assigned to interfaces
1159 * belonging to the same site as the outgoing
1160 * interface.)
1161 */
1162 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1163 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1164 dst.ifindex && dev->ifindex != dst.ifindex)
1165 continue;
1166
1167 idev = __in6_dev_get(dev);
1168 if (!idev)
1169 continue;
1170
1171 read_lock_bh(&idev->lock);
1172 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1173 int i;
1174
1175 /*
1176 * - Tentative Address (RFC2462 section 5.4)
1177 * - A tentative address is not considered
1178 * "assigned to an interface" in the traditional
1179 * sense, unless it is also flagged as optimistic.
1180 * - Candidate Source Address (section 4)
1181 * - In any case, anycast addresses, multicast
1182 * addresses, and the unspecified address MUST
1183 * NOT be included in a candidate set.
1184 */
1185 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1186 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1187 continue;
1188
1189 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1190
1191 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1192 score->addr_type & IPV6_ADDR_MULTICAST)) {
1193 LIMIT_NETDEBUG(KERN_DEBUG
1194 "ADDRCONF: unspecified / multicast address "
1195 "assigned as unicast address on %s",
1196 dev->name);
1197 continue;
1198 }
1199
1200 score->rule = -1;
1201 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1202
1203 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1204 int minihiscore, miniscore;
1205
1206 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1207 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1208
1209 if (minihiscore > miniscore) {
1210 if (i == IPV6_SADDR_RULE_SCOPE &&
1211 score->scopedist > 0) {
1212 /*
1213 * special case:
1214 * each remaining entry
1215 * has too small (not enough)
1216 * scope, because ifa entries
1217 * are sorted by their scope
1218 * values.
1219 */
1220 goto try_nextdev;
1221 }
1222 break;
1223 } else if (minihiscore < miniscore) {
1224 if (hiscore->ifa)
1225 in6_ifa_put(hiscore->ifa);
1226
1227 in6_ifa_hold(score->ifa);
1228
1229 swap(hiscore, score);
1230
1231 /* restore our iterator */
1232 score->ifa = hiscore->ifa;
1233
1234 break;
1235 }
1236 }
1237 }
1238 try_nextdev:
1239 read_unlock_bh(&idev->lock);
1240 }
1241 rcu_read_unlock();
1242
1243 if (!hiscore->ifa)
1244 return -EADDRNOTAVAIL;
1245
1246 ipv6_addr_copy(saddr, &hiscore->ifa->addr);
1247 in6_ifa_put(hiscore->ifa);
1248 return 0;
1249 }
1250 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1251
1252 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1253 unsigned char banned_flags)
1254 {
1255 struct inet6_dev *idev;
1256 int err = -EADDRNOTAVAIL;
1257
1258 rcu_read_lock();
1259 idev = __in6_dev_get(dev);
1260 if (idev) {
1261 struct inet6_ifaddr *ifp;
1262
1263 read_lock_bh(&idev->lock);
1264 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1265 if (ifp->scope == IFA_LINK &&
1266 !(ifp->flags & banned_flags)) {
1267 ipv6_addr_copy(addr, &ifp->addr);
1268 err = 0;
1269 break;
1270 }
1271 }
1272 read_unlock_bh(&idev->lock);
1273 }
1274 rcu_read_unlock();
1275 return err;
1276 }
1277
1278 static int ipv6_count_addresses(struct inet6_dev *idev)
1279 {
1280 int cnt = 0;
1281 struct inet6_ifaddr *ifp;
1282
1283 read_lock_bh(&idev->lock);
1284 list_for_each_entry(ifp, &idev->addr_list, if_list)
1285 cnt++;
1286 read_unlock_bh(&idev->lock);
1287 return cnt;
1288 }
1289
1290 int ipv6_chk_addr(struct net *net, struct in6_addr *addr,
1291 struct net_device *dev, int strict)
1292 {
1293 struct inet6_ifaddr *ifp;
1294 struct hlist_node *node;
1295 unsigned int hash = ipv6_addr_hash(addr);
1296
1297 rcu_read_lock_bh();
1298 hlist_for_each_entry_rcu(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1299 if (!net_eq(dev_net(ifp->idev->dev), net))
1300 continue;
1301 if (ipv6_addr_equal(&ifp->addr, addr) &&
1302 !(ifp->flags&IFA_F_TENTATIVE) &&
1303 (dev == NULL || ifp->idev->dev == dev ||
1304 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1305 rcu_read_unlock_bh();
1306 return 1;
1307 }
1308 }
1309
1310 rcu_read_unlock_bh();
1311 return 0;
1312 }
1313 EXPORT_SYMBOL(ipv6_chk_addr);
1314
1315 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1316 struct net_device *dev)
1317 {
1318 unsigned int hash = ipv6_addr_hash(addr);
1319 struct inet6_ifaddr *ifp;
1320 struct hlist_node *node;
1321
1322 hlist_for_each_entry(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1323 if (!net_eq(dev_net(ifp->idev->dev), net))
1324 continue;
1325 if (ipv6_addr_equal(&ifp->addr, addr)) {
1326 if (dev == NULL || ifp->idev->dev == dev)
1327 return true;
1328 }
1329 }
1330 return false;
1331 }
1332
1333 int ipv6_chk_prefix(struct in6_addr *addr, struct net_device *dev)
1334 {
1335 struct inet6_dev *idev;
1336 struct inet6_ifaddr *ifa;
1337 int onlink;
1338
1339 onlink = 0;
1340 rcu_read_lock();
1341 idev = __in6_dev_get(dev);
1342 if (idev) {
1343 read_lock_bh(&idev->lock);
1344 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1345 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1346 ifa->prefix_len);
1347 if (onlink)
1348 break;
1349 }
1350 read_unlock_bh(&idev->lock);
1351 }
1352 rcu_read_unlock();
1353 return onlink;
1354 }
1355
1356 EXPORT_SYMBOL(ipv6_chk_prefix);
1357
1358 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1359 struct net_device *dev, int strict)
1360 {
1361 struct inet6_ifaddr *ifp, *result = NULL;
1362 unsigned int hash = ipv6_addr_hash(addr);
1363 struct hlist_node *node;
1364
1365 rcu_read_lock_bh();
1366 hlist_for_each_entry_rcu_bh(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1367 if (!net_eq(dev_net(ifp->idev->dev), net))
1368 continue;
1369 if (ipv6_addr_equal(&ifp->addr, addr)) {
1370 if (dev == NULL || ifp->idev->dev == dev ||
1371 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1372 result = ifp;
1373 in6_ifa_hold(ifp);
1374 break;
1375 }
1376 }
1377 }
1378 rcu_read_unlock_bh();
1379
1380 return result;
1381 }
1382
1383 /* Gets referenced address, destroys ifaddr */
1384
1385 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1386 {
1387 if (ifp->flags&IFA_F_PERMANENT) {
1388 spin_lock_bh(&ifp->lock);
1389 addrconf_del_timer(ifp);
1390 ifp->flags |= IFA_F_TENTATIVE;
1391 if (dad_failed)
1392 ifp->flags |= IFA_F_DADFAILED;
1393 spin_unlock_bh(&ifp->lock);
1394 if (dad_failed)
1395 ipv6_ifa_notify(0, ifp);
1396 in6_ifa_put(ifp);
1397 #ifdef CONFIG_IPV6_PRIVACY
1398 } else if (ifp->flags&IFA_F_TEMPORARY) {
1399 struct inet6_ifaddr *ifpub;
1400 spin_lock_bh(&ifp->lock);
1401 ifpub = ifp->ifpub;
1402 if (ifpub) {
1403 in6_ifa_hold(ifpub);
1404 spin_unlock_bh(&ifp->lock);
1405 ipv6_create_tempaddr(ifpub, ifp);
1406 in6_ifa_put(ifpub);
1407 } else {
1408 spin_unlock_bh(&ifp->lock);
1409 }
1410 ipv6_del_addr(ifp);
1411 #endif
1412 } else
1413 ipv6_del_addr(ifp);
1414 }
1415
1416 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1417 {
1418 int err = -ENOENT;
1419
1420 spin_lock(&ifp->state_lock);
1421 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1422 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1423 err = 0;
1424 }
1425 spin_unlock(&ifp->state_lock);
1426
1427 return err;
1428 }
1429
1430 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1431 {
1432 struct inet6_dev *idev = ifp->idev;
1433
1434 if (addrconf_dad_end(ifp)) {
1435 in6_ifa_put(ifp);
1436 return;
1437 }
1438
1439 if (net_ratelimit())
1440 printk(KERN_INFO "%s: IPv6 duplicate address %pI6c detected!\n",
1441 ifp->idev->dev->name, &ifp->addr);
1442
1443 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1444 struct in6_addr addr;
1445
1446 addr.s6_addr32[0] = htonl(0xfe800000);
1447 addr.s6_addr32[1] = 0;
1448
1449 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1450 ipv6_addr_equal(&ifp->addr, &addr)) {
1451 /* DAD failed for link-local based on MAC address */
1452 idev->cnf.disable_ipv6 = 1;
1453
1454 printk(KERN_INFO "%s: IPv6 being disabled!\n",
1455 ifp->idev->dev->name);
1456 }
1457 }
1458
1459 addrconf_dad_stop(ifp, 1);
1460 }
1461
1462 /* Join to solicited addr multicast group. */
1463
1464 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1465 {
1466 struct in6_addr maddr;
1467
1468 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1469 return;
1470
1471 addrconf_addr_solict_mult(addr, &maddr);
1472 ipv6_dev_mc_inc(dev, &maddr);
1473 }
1474
1475 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1476 {
1477 struct in6_addr maddr;
1478
1479 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1480 return;
1481
1482 addrconf_addr_solict_mult(addr, &maddr);
1483 __ipv6_dev_mc_dec(idev, &maddr);
1484 }
1485
1486 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1487 {
1488 struct in6_addr addr;
1489 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1490 if (ipv6_addr_any(&addr))
1491 return;
1492 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1493 }
1494
1495 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1496 {
1497 struct in6_addr addr;
1498 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1499 if (ipv6_addr_any(&addr))
1500 return;
1501 __ipv6_dev_ac_dec(ifp->idev, &addr);
1502 }
1503
1504 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1505 {
1506 if (dev->addr_len != ETH_ALEN)
1507 return -1;
1508 memcpy(eui, dev->dev_addr, 3);
1509 memcpy(eui + 5, dev->dev_addr + 3, 3);
1510
1511 /*
1512 * The zSeries OSA network cards can be shared among various
1513 * OS instances, but the OSA cards have only one MAC address.
1514 * This leads to duplicate address conflicts in conjunction
1515 * with IPv6 if more than one instance uses the same card.
1516 *
1517 * The driver for these cards can deliver a unique 16-bit
1518 * identifier for each instance sharing the same card. It is
1519 * placed instead of 0xFFFE in the interface identifier. The
1520 * "u" bit of the interface identifier is not inverted in this
1521 * case. Hence the resulting interface identifier has local
1522 * scope according to RFC2373.
1523 */
1524 if (dev->dev_id) {
1525 eui[3] = (dev->dev_id >> 8) & 0xFF;
1526 eui[4] = dev->dev_id & 0xFF;
1527 } else {
1528 eui[3] = 0xFF;
1529 eui[4] = 0xFE;
1530 eui[0] ^= 2;
1531 }
1532 return 0;
1533 }
1534
1535 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1536 {
1537 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1538 if (dev->addr_len != ARCNET_ALEN)
1539 return -1;
1540 memset(eui, 0, 7);
1541 eui[7] = *(u8*)dev->dev_addr;
1542 return 0;
1543 }
1544
1545 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1546 {
1547 if (dev->addr_len != INFINIBAND_ALEN)
1548 return -1;
1549 memcpy(eui, dev->dev_addr + 12, 8);
1550 eui[0] |= 2;
1551 return 0;
1552 }
1553
1554 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1555 {
1556 if (addr == 0)
1557 return -1;
1558 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1559 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1560 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1561 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1562 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1563 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1564 eui[1] = 0;
1565 eui[2] = 0x5E;
1566 eui[3] = 0xFE;
1567 memcpy(eui + 4, &addr, 4);
1568 return 0;
1569 }
1570
1571 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1572 {
1573 if (dev->priv_flags & IFF_ISATAP)
1574 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1575 return -1;
1576 }
1577
1578 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1579 {
1580 switch (dev->type) {
1581 case ARPHRD_ETHER:
1582 case ARPHRD_FDDI:
1583 case ARPHRD_IEEE802_TR:
1584 return addrconf_ifid_eui48(eui, dev);
1585 case ARPHRD_ARCNET:
1586 return addrconf_ifid_arcnet(eui, dev);
1587 case ARPHRD_INFINIBAND:
1588 return addrconf_ifid_infiniband(eui, dev);
1589 case ARPHRD_SIT:
1590 return addrconf_ifid_sit(eui, dev);
1591 }
1592 return -1;
1593 }
1594
1595 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1596 {
1597 int err = -1;
1598 struct inet6_ifaddr *ifp;
1599
1600 read_lock_bh(&idev->lock);
1601 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1602 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1603 memcpy(eui, ifp->addr.s6_addr+8, 8);
1604 err = 0;
1605 break;
1606 }
1607 }
1608 read_unlock_bh(&idev->lock);
1609 return err;
1610 }
1611
1612 #ifdef CONFIG_IPV6_PRIVACY
1613 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1614 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1615 {
1616 regen:
1617 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1618 idev->rndid[0] &= ~0x02;
1619
1620 /*
1621 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1622 * check if generated address is not inappropriate
1623 *
1624 * - Reserved subnet anycast (RFC 2526)
1625 * 11111101 11....11 1xxxxxxx
1626 * - ISATAP (RFC4214) 6.1
1627 * 00-00-5E-FE-xx-xx-xx-xx
1628 * - value 0
1629 * - XXX: already assigned to an address on the device
1630 */
1631 if (idev->rndid[0] == 0xfd &&
1632 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1633 (idev->rndid[7]&0x80))
1634 goto regen;
1635 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1636 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1637 goto regen;
1638 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1639 goto regen;
1640 }
1641
1642 return 0;
1643 }
1644
1645 static void ipv6_regen_rndid(unsigned long data)
1646 {
1647 struct inet6_dev *idev = (struct inet6_dev *) data;
1648 unsigned long expires;
1649
1650 rcu_read_lock_bh();
1651 write_lock_bh(&idev->lock);
1652
1653 if (idev->dead)
1654 goto out;
1655
1656 if (__ipv6_regen_rndid(idev) < 0)
1657 goto out;
1658
1659 expires = jiffies +
1660 idev->cnf.temp_prefered_lft * HZ -
1661 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time -
1662 idev->cnf.max_desync_factor * HZ;
1663 if (time_before(expires, jiffies)) {
1664 printk(KERN_WARNING
1665 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1666 idev->dev->name);
1667 goto out;
1668 }
1669
1670 if (!mod_timer(&idev->regen_timer, expires))
1671 in6_dev_hold(idev);
1672
1673 out:
1674 write_unlock_bh(&idev->lock);
1675 rcu_read_unlock_bh();
1676 in6_dev_put(idev);
1677 }
1678
1679 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1680 int ret = 0;
1681
1682 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1683 ret = __ipv6_regen_rndid(idev);
1684 return ret;
1685 }
1686 #endif
1687
1688 /*
1689 * Add prefix route.
1690 */
1691
1692 static void
1693 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1694 unsigned long expires, u32 flags)
1695 {
1696 struct fib6_config cfg = {
1697 .fc_table = RT6_TABLE_PREFIX,
1698 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1699 .fc_ifindex = dev->ifindex,
1700 .fc_expires = expires,
1701 .fc_dst_len = plen,
1702 .fc_flags = RTF_UP | flags,
1703 .fc_nlinfo.nl_net = dev_net(dev),
1704 .fc_protocol = RTPROT_KERNEL,
1705 };
1706
1707 ipv6_addr_copy(&cfg.fc_dst, pfx);
1708
1709 /* Prevent useless cloning on PtP SIT.
1710 This thing is done here expecting that the whole
1711 class of non-broadcast devices need not cloning.
1712 */
1713 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1714 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1715 cfg.fc_flags |= RTF_NONEXTHOP;
1716 #endif
1717
1718 ip6_route_add(&cfg);
1719 }
1720
1721 /* Create "default" multicast route to the interface */
1722
1723 static void addrconf_add_mroute(struct net_device *dev)
1724 {
1725 struct fib6_config cfg = {
1726 .fc_table = RT6_TABLE_LOCAL,
1727 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1728 .fc_ifindex = dev->ifindex,
1729 .fc_dst_len = 8,
1730 .fc_flags = RTF_UP,
1731 .fc_nlinfo.nl_net = dev_net(dev),
1732 };
1733
1734 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1735
1736 ip6_route_add(&cfg);
1737 }
1738
1739 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1740 static void sit_route_add(struct net_device *dev)
1741 {
1742 struct fib6_config cfg = {
1743 .fc_table = RT6_TABLE_MAIN,
1744 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1745 .fc_ifindex = dev->ifindex,
1746 .fc_dst_len = 96,
1747 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1748 .fc_nlinfo.nl_net = dev_net(dev),
1749 };
1750
1751 /* prefix length - 96 bits "::d.d.d.d" */
1752 ip6_route_add(&cfg);
1753 }
1754 #endif
1755
1756 static void addrconf_add_lroute(struct net_device *dev)
1757 {
1758 struct in6_addr addr;
1759
1760 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1761 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1762 }
1763
1764 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1765 {
1766 struct inet6_dev *idev;
1767
1768 ASSERT_RTNL();
1769
1770 idev = ipv6_find_idev(dev);
1771 if (!idev)
1772 return ERR_PTR(-ENOBUFS);
1773
1774 if (idev->cnf.disable_ipv6)
1775 return ERR_PTR(-EACCES);
1776
1777 /* Add default multicast route */
1778 addrconf_add_mroute(dev);
1779
1780 /* Add link local route */
1781 addrconf_add_lroute(dev);
1782 return idev;
1783 }
1784
1785 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1786 {
1787 struct prefix_info *pinfo;
1788 __u32 valid_lft;
1789 __u32 prefered_lft;
1790 int addr_type;
1791 struct inet6_dev *in6_dev;
1792 struct net *net = dev_net(dev);
1793
1794 pinfo = (struct prefix_info *) opt;
1795
1796 if (len < sizeof(struct prefix_info)) {
1797 ADBG(("addrconf: prefix option too short\n"));
1798 return;
1799 }
1800
1801 /*
1802 * Validation checks ([ADDRCONF], page 19)
1803 */
1804
1805 addr_type = ipv6_addr_type(&pinfo->prefix);
1806
1807 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1808 return;
1809
1810 valid_lft = ntohl(pinfo->valid);
1811 prefered_lft = ntohl(pinfo->prefered);
1812
1813 if (prefered_lft > valid_lft) {
1814 if (net_ratelimit())
1815 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1816 return;
1817 }
1818
1819 in6_dev = in6_dev_get(dev);
1820
1821 if (in6_dev == NULL) {
1822 if (net_ratelimit())
1823 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1824 return;
1825 }
1826
1827 /*
1828 * Two things going on here:
1829 * 1) Add routes for on-link prefixes
1830 * 2) Configure prefixes with the auto flag set
1831 */
1832
1833 if (pinfo->onlink) {
1834 struct rt6_info *rt;
1835 unsigned long rt_expires;
1836
1837 /* Avoid arithmetic overflow. Really, we could
1838 * save rt_expires in seconds, likely valid_lft,
1839 * but it would require division in fib gc, that it
1840 * not good.
1841 */
1842 if (HZ > USER_HZ)
1843 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
1844 else
1845 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
1846
1847 if (addrconf_finite_timeout(rt_expires))
1848 rt_expires *= HZ;
1849
1850 rt = rt6_lookup(net, &pinfo->prefix, NULL,
1851 dev->ifindex, 1);
1852
1853 if (rt && addrconf_is_prefix_route(rt)) {
1854 /* Autoconf prefix route */
1855 if (valid_lft == 0) {
1856 ip6_del_rt(rt);
1857 rt = NULL;
1858 } else if (addrconf_finite_timeout(rt_expires)) {
1859 /* not infinity */
1860 rt->rt6i_expires = jiffies + rt_expires;
1861 rt->rt6i_flags |= RTF_EXPIRES;
1862 } else {
1863 rt->rt6i_flags &= ~RTF_EXPIRES;
1864 rt->rt6i_expires = 0;
1865 }
1866 } else if (valid_lft) {
1867 clock_t expires = 0;
1868 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
1869 if (addrconf_finite_timeout(rt_expires)) {
1870 /* not infinity */
1871 flags |= RTF_EXPIRES;
1872 expires = jiffies_to_clock_t(rt_expires);
1873 }
1874 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1875 dev, expires, flags);
1876 }
1877 if (rt)
1878 dst_release(&rt->dst);
1879 }
1880
1881 /* Try to figure out our local address for this prefix */
1882
1883 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1884 struct inet6_ifaddr * ifp;
1885 struct in6_addr addr;
1886 int create = 0, update_lft = 0;
1887
1888 if (pinfo->prefix_len == 64) {
1889 memcpy(&addr, &pinfo->prefix, 8);
1890 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1891 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1892 in6_dev_put(in6_dev);
1893 return;
1894 }
1895 goto ok;
1896 }
1897 if (net_ratelimit())
1898 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1899 pinfo->prefix_len);
1900 in6_dev_put(in6_dev);
1901 return;
1902
1903 ok:
1904
1905 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1906
1907 if (ifp == NULL && valid_lft) {
1908 int max_addresses = in6_dev->cnf.max_addresses;
1909 u32 addr_flags = 0;
1910
1911 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1912 if (in6_dev->cnf.optimistic_dad &&
1913 !net->ipv6.devconf_all->forwarding)
1914 addr_flags = IFA_F_OPTIMISTIC;
1915 #endif
1916
1917 /* Do not allow to create too much of autoconfigured
1918 * addresses; this would be too easy way to crash kernel.
1919 */
1920 if (!max_addresses ||
1921 ipv6_count_addresses(in6_dev) < max_addresses)
1922 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1923 addr_type&IPV6_ADDR_SCOPE_MASK,
1924 addr_flags);
1925
1926 if (!ifp || IS_ERR(ifp)) {
1927 in6_dev_put(in6_dev);
1928 return;
1929 }
1930
1931 update_lft = create = 1;
1932 ifp->cstamp = jiffies;
1933 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1934 }
1935
1936 if (ifp) {
1937 int flags;
1938 unsigned long now;
1939 #ifdef CONFIG_IPV6_PRIVACY
1940 struct inet6_ifaddr *ift;
1941 #endif
1942 u32 stored_lft;
1943
1944 /* update lifetime (RFC2462 5.5.3 e) */
1945 spin_lock(&ifp->lock);
1946 now = jiffies;
1947 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1948 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1949 else
1950 stored_lft = 0;
1951 if (!update_lft && stored_lft) {
1952 if (valid_lft > MIN_VALID_LIFETIME ||
1953 valid_lft > stored_lft)
1954 update_lft = 1;
1955 else if (stored_lft <= MIN_VALID_LIFETIME) {
1956 /* valid_lft <= stored_lft is always true */
1957 /*
1958 * RFC 4862 Section 5.5.3e:
1959 * "Note that the preferred lifetime of
1960 * the corresponding address is always
1961 * reset to the Preferred Lifetime in
1962 * the received Prefix Information
1963 * option, regardless of whether the
1964 * valid lifetime is also reset or
1965 * ignored."
1966 *
1967 * So if the preferred lifetime in
1968 * this advertisement is different
1969 * than what we have stored, but the
1970 * valid lifetime is invalid, just
1971 * reset prefered_lft.
1972 *
1973 * We must set the valid lifetime
1974 * to the stored lifetime since we'll
1975 * be updating the timestamp below,
1976 * else we'll set it back to the
1977 * minumum.
1978 */
1979 if (prefered_lft != ifp->prefered_lft) {
1980 valid_lft = stored_lft;
1981 update_lft = 1;
1982 }
1983 } else {
1984 valid_lft = MIN_VALID_LIFETIME;
1985 if (valid_lft < prefered_lft)
1986 prefered_lft = valid_lft;
1987 update_lft = 1;
1988 }
1989 }
1990
1991 if (update_lft) {
1992 ifp->valid_lft = valid_lft;
1993 ifp->prefered_lft = prefered_lft;
1994 ifp->tstamp = now;
1995 flags = ifp->flags;
1996 ifp->flags &= ~IFA_F_DEPRECATED;
1997 spin_unlock(&ifp->lock);
1998
1999 if (!(flags&IFA_F_TENTATIVE))
2000 ipv6_ifa_notify(0, ifp);
2001 } else
2002 spin_unlock(&ifp->lock);
2003
2004 #ifdef CONFIG_IPV6_PRIVACY
2005 read_lock_bh(&in6_dev->lock);
2006 /* update all temporary addresses in the list */
2007 list_for_each_entry(ift, &in6_dev->tempaddr_list, tmp_list) {
2008 /*
2009 * When adjusting the lifetimes of an existing
2010 * temporary address, only lower the lifetimes.
2011 * Implementations must not increase the
2012 * lifetimes of an existing temporary address
2013 * when processing a Prefix Information Option.
2014 */
2015 if (ifp != ift->ifpub)
2016 continue;
2017
2018 spin_lock(&ift->lock);
2019 flags = ift->flags;
2020 if (ift->valid_lft > valid_lft &&
2021 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
2022 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
2023 if (ift->prefered_lft > prefered_lft &&
2024 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
2025 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
2026 spin_unlock(&ift->lock);
2027 if (!(flags&IFA_F_TENTATIVE))
2028 ipv6_ifa_notify(0, ift);
2029 }
2030
2031 if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) {
2032 /*
2033 * When a new public address is created as described in [ADDRCONF],
2034 * also create a new temporary address. Also create a temporary
2035 * address if it's enabled but no temporary address currently exists.
2036 */
2037 read_unlock_bh(&in6_dev->lock);
2038 ipv6_create_tempaddr(ifp, NULL);
2039 } else {
2040 read_unlock_bh(&in6_dev->lock);
2041 }
2042 #endif
2043 in6_ifa_put(ifp);
2044 addrconf_verify(0);
2045 }
2046 }
2047 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2048 in6_dev_put(in6_dev);
2049 }
2050
2051 /*
2052 * Set destination address.
2053 * Special case for SIT interfaces where we create a new "virtual"
2054 * device.
2055 */
2056 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2057 {
2058 struct in6_ifreq ireq;
2059 struct net_device *dev;
2060 int err = -EINVAL;
2061
2062 rtnl_lock();
2063
2064 err = -EFAULT;
2065 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2066 goto err_exit;
2067
2068 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2069
2070 err = -ENODEV;
2071 if (dev == NULL)
2072 goto err_exit;
2073
2074 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2075 if (dev->type == ARPHRD_SIT) {
2076 const struct net_device_ops *ops = dev->netdev_ops;
2077 struct ifreq ifr;
2078 struct ip_tunnel_parm p;
2079
2080 err = -EADDRNOTAVAIL;
2081 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2082 goto err_exit;
2083
2084 memset(&p, 0, sizeof(p));
2085 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2086 p.iph.saddr = 0;
2087 p.iph.version = 4;
2088 p.iph.ihl = 5;
2089 p.iph.protocol = IPPROTO_IPV6;
2090 p.iph.ttl = 64;
2091 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2092
2093 if (ops->ndo_do_ioctl) {
2094 mm_segment_t oldfs = get_fs();
2095
2096 set_fs(KERNEL_DS);
2097 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2098 set_fs(oldfs);
2099 } else
2100 err = -EOPNOTSUPP;
2101
2102 if (err == 0) {
2103 err = -ENOBUFS;
2104 dev = __dev_get_by_name(net, p.name);
2105 if (!dev)
2106 goto err_exit;
2107 err = dev_open(dev);
2108 }
2109 }
2110 #endif
2111
2112 err_exit:
2113 rtnl_unlock();
2114 return err;
2115 }
2116
2117 /*
2118 * Manual configuration of address on an interface
2119 */
2120 static int inet6_addr_add(struct net *net, int ifindex, struct in6_addr *pfx,
2121 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
2122 __u32 valid_lft)
2123 {
2124 struct inet6_ifaddr *ifp;
2125 struct inet6_dev *idev;
2126 struct net_device *dev;
2127 int scope;
2128 u32 flags;
2129 clock_t expires;
2130 unsigned long timeout;
2131
2132 ASSERT_RTNL();
2133
2134 if (plen > 128)
2135 return -EINVAL;
2136
2137 /* check the lifetime */
2138 if (!valid_lft || prefered_lft > valid_lft)
2139 return -EINVAL;
2140
2141 dev = __dev_get_by_index(net, ifindex);
2142 if (!dev)
2143 return -ENODEV;
2144
2145 idev = addrconf_add_dev(dev);
2146 if (IS_ERR(idev))
2147 return PTR_ERR(idev);
2148
2149 scope = ipv6_addr_scope(pfx);
2150
2151 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2152 if (addrconf_finite_timeout(timeout)) {
2153 expires = jiffies_to_clock_t(timeout * HZ);
2154 valid_lft = timeout;
2155 flags = RTF_EXPIRES;
2156 } else {
2157 expires = 0;
2158 flags = 0;
2159 ifa_flags |= IFA_F_PERMANENT;
2160 }
2161
2162 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2163 if (addrconf_finite_timeout(timeout)) {
2164 if (timeout == 0)
2165 ifa_flags |= IFA_F_DEPRECATED;
2166 prefered_lft = timeout;
2167 }
2168
2169 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2170
2171 if (!IS_ERR(ifp)) {
2172 spin_lock_bh(&ifp->lock);
2173 ifp->valid_lft = valid_lft;
2174 ifp->prefered_lft = prefered_lft;
2175 ifp->tstamp = jiffies;
2176 spin_unlock_bh(&ifp->lock);
2177
2178 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2179 expires, flags);
2180 /*
2181 * Note that section 3.1 of RFC 4429 indicates
2182 * that the Optimistic flag should not be set for
2183 * manually configured addresses
2184 */
2185 addrconf_dad_start(ifp, 0);
2186 in6_ifa_put(ifp);
2187 addrconf_verify(0);
2188 return 0;
2189 }
2190
2191 return PTR_ERR(ifp);
2192 }
2193
2194 static int inet6_addr_del(struct net *net, int ifindex, struct in6_addr *pfx,
2195 unsigned int plen)
2196 {
2197 struct inet6_ifaddr *ifp;
2198 struct inet6_dev *idev;
2199 struct net_device *dev;
2200
2201 if (plen > 128)
2202 return -EINVAL;
2203
2204 dev = __dev_get_by_index(net, ifindex);
2205 if (!dev)
2206 return -ENODEV;
2207
2208 if ((idev = __in6_dev_get(dev)) == NULL)
2209 return -ENXIO;
2210
2211 read_lock_bh(&idev->lock);
2212 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2213 if (ifp->prefix_len == plen &&
2214 ipv6_addr_equal(pfx, &ifp->addr)) {
2215 in6_ifa_hold(ifp);
2216 read_unlock_bh(&idev->lock);
2217
2218 ipv6_del_addr(ifp);
2219
2220 /* If the last address is deleted administratively,
2221 disable IPv6 on this interface.
2222 */
2223 if (list_empty(&idev->addr_list))
2224 addrconf_ifdown(idev->dev, 1);
2225 return 0;
2226 }
2227 }
2228 read_unlock_bh(&idev->lock);
2229 return -EADDRNOTAVAIL;
2230 }
2231
2232
2233 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2234 {
2235 struct in6_ifreq ireq;
2236 int err;
2237
2238 if (!capable(CAP_NET_ADMIN))
2239 return -EPERM;
2240
2241 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2242 return -EFAULT;
2243
2244 rtnl_lock();
2245 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2246 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2247 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2248 rtnl_unlock();
2249 return err;
2250 }
2251
2252 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2253 {
2254 struct in6_ifreq ireq;
2255 int err;
2256
2257 if (!capable(CAP_NET_ADMIN))
2258 return -EPERM;
2259
2260 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2261 return -EFAULT;
2262
2263 rtnl_lock();
2264 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2265 ireq.ifr6_prefixlen);
2266 rtnl_unlock();
2267 return err;
2268 }
2269
2270 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2271 int plen, int scope)
2272 {
2273 struct inet6_ifaddr *ifp;
2274
2275 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT);
2276 if (!IS_ERR(ifp)) {
2277 spin_lock_bh(&ifp->lock);
2278 ifp->flags &= ~IFA_F_TENTATIVE;
2279 spin_unlock_bh(&ifp->lock);
2280 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2281 in6_ifa_put(ifp);
2282 }
2283 }
2284
2285 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2286 static void sit_add_v4_addrs(struct inet6_dev *idev)
2287 {
2288 struct in6_addr addr;
2289 struct net_device *dev;
2290 struct net *net = dev_net(idev->dev);
2291 int scope;
2292
2293 ASSERT_RTNL();
2294
2295 memset(&addr, 0, sizeof(struct in6_addr));
2296 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2297
2298 if (idev->dev->flags&IFF_POINTOPOINT) {
2299 addr.s6_addr32[0] = htonl(0xfe800000);
2300 scope = IFA_LINK;
2301 } else {
2302 scope = IPV6_ADDR_COMPATv4;
2303 }
2304
2305 if (addr.s6_addr32[3]) {
2306 add_addr(idev, &addr, 128, scope);
2307 return;
2308 }
2309
2310 for_each_netdev(net, dev) {
2311 struct in_device * in_dev = __in_dev_get_rtnl(dev);
2312 if (in_dev && (dev->flags & IFF_UP)) {
2313 struct in_ifaddr * ifa;
2314
2315 int flag = scope;
2316
2317 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2318 int plen;
2319
2320 addr.s6_addr32[3] = ifa->ifa_local;
2321
2322 if (ifa->ifa_scope == RT_SCOPE_LINK)
2323 continue;
2324 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2325 if (idev->dev->flags&IFF_POINTOPOINT)
2326 continue;
2327 flag |= IFA_HOST;
2328 }
2329 if (idev->dev->flags&IFF_POINTOPOINT)
2330 plen = 64;
2331 else
2332 plen = 96;
2333
2334 add_addr(idev, &addr, plen, flag);
2335 }
2336 }
2337 }
2338 }
2339 #endif
2340
2341 static void init_loopback(struct net_device *dev)
2342 {
2343 struct inet6_dev *idev;
2344
2345 /* ::1 */
2346
2347 ASSERT_RTNL();
2348
2349 if ((idev = ipv6_find_idev(dev)) == NULL) {
2350 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2351 return;
2352 }
2353
2354 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2355 }
2356
2357 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2358 {
2359 struct inet6_ifaddr * ifp;
2360 u32 addr_flags = IFA_F_PERMANENT;
2361
2362 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2363 if (idev->cnf.optimistic_dad &&
2364 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2365 addr_flags |= IFA_F_OPTIMISTIC;
2366 #endif
2367
2368
2369 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2370 if (!IS_ERR(ifp)) {
2371 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2372 addrconf_dad_start(ifp, 0);
2373 in6_ifa_put(ifp);
2374 }
2375 }
2376
2377 static void addrconf_dev_config(struct net_device *dev)
2378 {
2379 struct in6_addr addr;
2380 struct inet6_dev * idev;
2381
2382 ASSERT_RTNL();
2383
2384 if ((dev->type != ARPHRD_ETHER) &&
2385 (dev->type != ARPHRD_FDDI) &&
2386 (dev->type != ARPHRD_IEEE802_TR) &&
2387 (dev->type != ARPHRD_ARCNET) &&
2388 (dev->type != ARPHRD_INFINIBAND)) {
2389 /* Alas, we support only Ethernet autoconfiguration. */
2390 return;
2391 }
2392
2393 idev = addrconf_add_dev(dev);
2394 if (IS_ERR(idev))
2395 return;
2396
2397 memset(&addr, 0, sizeof(struct in6_addr));
2398 addr.s6_addr32[0] = htonl(0xFE800000);
2399
2400 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2401 addrconf_add_linklocal(idev, &addr);
2402 }
2403
2404 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2405 static void addrconf_sit_config(struct net_device *dev)
2406 {
2407 struct inet6_dev *idev;
2408
2409 ASSERT_RTNL();
2410
2411 /*
2412 * Configure the tunnel with one of our IPv4
2413 * addresses... we should configure all of
2414 * our v4 addrs in the tunnel
2415 */
2416
2417 if ((idev = ipv6_find_idev(dev)) == NULL) {
2418 printk(KERN_DEBUG "init sit: add_dev failed\n");
2419 return;
2420 }
2421
2422 if (dev->priv_flags & IFF_ISATAP) {
2423 struct in6_addr addr;
2424
2425 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2426 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2427 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2428 addrconf_add_linklocal(idev, &addr);
2429 return;
2430 }
2431
2432 sit_add_v4_addrs(idev);
2433
2434 if (dev->flags&IFF_POINTOPOINT) {
2435 addrconf_add_mroute(dev);
2436 addrconf_add_lroute(dev);
2437 } else
2438 sit_route_add(dev);
2439 }
2440 #endif
2441
2442 static inline int
2443 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2444 {
2445 struct in6_addr lladdr;
2446
2447 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2448 addrconf_add_linklocal(idev, &lladdr);
2449 return 0;
2450 }
2451 return -1;
2452 }
2453
2454 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2455 {
2456 struct net_device *link_dev;
2457 struct net *net = dev_net(idev->dev);
2458
2459 /* first try to inherit the link-local address from the link device */
2460 if (idev->dev->iflink &&
2461 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
2462 if (!ipv6_inherit_linklocal(idev, link_dev))
2463 return;
2464 }
2465 /* then try to inherit it from any device */
2466 for_each_netdev(net, link_dev) {
2467 if (!ipv6_inherit_linklocal(idev, link_dev))
2468 return;
2469 }
2470 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2471 }
2472
2473 /*
2474 * Autoconfigure tunnel with a link-local address so routing protocols,
2475 * DHCPv6, MLD etc. can be run over the virtual link
2476 */
2477
2478 static void addrconf_ip6_tnl_config(struct net_device *dev)
2479 {
2480 struct inet6_dev *idev;
2481
2482 ASSERT_RTNL();
2483
2484 idev = addrconf_add_dev(dev);
2485 if (IS_ERR(idev)) {
2486 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2487 return;
2488 }
2489 ip6_tnl_add_linklocal(idev);
2490 }
2491
2492 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2493 void * data)
2494 {
2495 struct net_device *dev = (struct net_device *) data;
2496 struct inet6_dev *idev = __in6_dev_get(dev);
2497 int run_pending = 0;
2498 int err;
2499
2500 switch (event) {
2501 case NETDEV_REGISTER:
2502 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2503 idev = ipv6_add_dev(dev);
2504 if (!idev)
2505 return notifier_from_errno(-ENOMEM);
2506 }
2507 break;
2508
2509 case NETDEV_UP:
2510 case NETDEV_CHANGE:
2511 if (dev->flags & IFF_SLAVE)
2512 break;
2513
2514 if (event == NETDEV_UP) {
2515 if (!addrconf_qdisc_ok(dev)) {
2516 /* device is not ready yet. */
2517 printk(KERN_INFO
2518 "ADDRCONF(NETDEV_UP): %s: "
2519 "link is not ready\n",
2520 dev->name);
2521 break;
2522 }
2523
2524 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2525 idev = ipv6_add_dev(dev);
2526
2527 if (idev) {
2528 idev->if_flags |= IF_READY;
2529 run_pending = 1;
2530 }
2531 } else {
2532 if (!addrconf_qdisc_ok(dev)) {
2533 /* device is still not ready. */
2534 break;
2535 }
2536
2537 if (idev) {
2538 if (idev->if_flags & IF_READY)
2539 /* device is already configured. */
2540 break;
2541 idev->if_flags |= IF_READY;
2542 }
2543
2544 printk(KERN_INFO
2545 "ADDRCONF(NETDEV_CHANGE): %s: "
2546 "link becomes ready\n",
2547 dev->name);
2548
2549 run_pending = 1;
2550 }
2551
2552 switch (dev->type) {
2553 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2554 case ARPHRD_SIT:
2555 addrconf_sit_config(dev);
2556 break;
2557 #endif
2558 case ARPHRD_TUNNEL6:
2559 addrconf_ip6_tnl_config(dev);
2560 break;
2561 case ARPHRD_LOOPBACK:
2562 init_loopback(dev);
2563 break;
2564
2565 default:
2566 addrconf_dev_config(dev);
2567 break;
2568 }
2569
2570 if (idev) {
2571 if (run_pending)
2572 addrconf_dad_run(idev);
2573
2574 /*
2575 * If the MTU changed during the interface down,
2576 * when the interface up, the changed MTU must be
2577 * reflected in the idev as well as routers.
2578 */
2579 if (idev->cnf.mtu6 != dev->mtu &&
2580 dev->mtu >= IPV6_MIN_MTU) {
2581 rt6_mtu_change(dev, dev->mtu);
2582 idev->cnf.mtu6 = dev->mtu;
2583 }
2584 idev->tstamp = jiffies;
2585 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2586
2587 /*
2588 * If the changed mtu during down is lower than
2589 * IPV6_MIN_MTU stop IPv6 on this interface.
2590 */
2591 if (dev->mtu < IPV6_MIN_MTU)
2592 addrconf_ifdown(dev, 1);
2593 }
2594 break;
2595
2596 case NETDEV_CHANGEMTU:
2597 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2598 rt6_mtu_change(dev, dev->mtu);
2599 idev->cnf.mtu6 = dev->mtu;
2600 break;
2601 }
2602
2603 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2604 idev = ipv6_add_dev(dev);
2605 if (idev)
2606 break;
2607 }
2608
2609 /*
2610 * MTU falled under IPV6_MIN_MTU.
2611 * Stop IPv6 on this interface.
2612 */
2613
2614 case NETDEV_DOWN:
2615 case NETDEV_UNREGISTER:
2616 /*
2617 * Remove all addresses from this interface.
2618 */
2619 addrconf_ifdown(dev, event != NETDEV_DOWN);
2620 break;
2621
2622 case NETDEV_CHANGENAME:
2623 if (idev) {
2624 snmp6_unregister_dev(idev);
2625 addrconf_sysctl_unregister(idev);
2626 addrconf_sysctl_register(idev);
2627 err = snmp6_register_dev(idev);
2628 if (err)
2629 return notifier_from_errno(err);
2630 }
2631 break;
2632
2633 case NETDEV_PRE_TYPE_CHANGE:
2634 case NETDEV_POST_TYPE_CHANGE:
2635 addrconf_type_change(dev, event);
2636 break;
2637 }
2638
2639 return NOTIFY_OK;
2640 }
2641
2642 /*
2643 * addrconf module should be notified of a device going up
2644 */
2645 static struct notifier_block ipv6_dev_notf = {
2646 .notifier_call = addrconf_notify,
2647 };
2648
2649 static void addrconf_type_change(struct net_device *dev, unsigned long event)
2650 {
2651 struct inet6_dev *idev;
2652 ASSERT_RTNL();
2653
2654 idev = __in6_dev_get(dev);
2655
2656 if (event == NETDEV_POST_TYPE_CHANGE)
2657 ipv6_mc_remap(idev);
2658 else if (event == NETDEV_PRE_TYPE_CHANGE)
2659 ipv6_mc_unmap(idev);
2660 }
2661
2662 static int addrconf_ifdown(struct net_device *dev, int how)
2663 {
2664 struct net *net = dev_net(dev);
2665 struct inet6_dev *idev;
2666 struct inet6_ifaddr *ifa;
2667 LIST_HEAD(keep_list);
2668 int state;
2669
2670 ASSERT_RTNL();
2671
2672 /* Flush routes if device is being removed or it is not loopback */
2673 if (how || !(dev->flags & IFF_LOOPBACK))
2674 rt6_ifdown(net, dev);
2675 neigh_ifdown(&nd_tbl, dev);
2676
2677 idev = __in6_dev_get(dev);
2678 if (idev == NULL)
2679 return -ENODEV;
2680
2681 /*
2682 * Step 1: remove reference to ipv6 device from parent device.
2683 * Do not dev_put!
2684 */
2685 if (how) {
2686 idev->dead = 1;
2687
2688 /* protected by rtnl_lock */
2689 rcu_assign_pointer(dev->ip6_ptr, NULL);
2690
2691 /* Step 1.5: remove snmp6 entry */
2692 snmp6_unregister_dev(idev);
2693
2694 }
2695
2696 write_lock_bh(&idev->lock);
2697
2698 /* Step 2: clear flags for stateless addrconf */
2699 if (!how)
2700 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2701
2702 #ifdef CONFIG_IPV6_PRIVACY
2703 if (how && del_timer(&idev->regen_timer))
2704 in6_dev_put(idev);
2705
2706 /* Step 3: clear tempaddr list */
2707 while (!list_empty(&idev->tempaddr_list)) {
2708 ifa = list_first_entry(&idev->tempaddr_list,
2709 struct inet6_ifaddr, tmp_list);
2710 list_del(&ifa->tmp_list);
2711 write_unlock_bh(&idev->lock);
2712 spin_lock_bh(&ifa->lock);
2713
2714 if (ifa->ifpub) {
2715 in6_ifa_put(ifa->ifpub);
2716 ifa->ifpub = NULL;
2717 }
2718 spin_unlock_bh(&ifa->lock);
2719 in6_ifa_put(ifa);
2720 write_lock_bh(&idev->lock);
2721 }
2722 #endif
2723
2724 while (!list_empty(&idev->addr_list)) {
2725 ifa = list_first_entry(&idev->addr_list,
2726 struct inet6_ifaddr, if_list);
2727 addrconf_del_timer(ifa);
2728
2729 /* If just doing link down, and address is permanent
2730 and not link-local, then retain it. */
2731 if (!how &&
2732 (ifa->flags&IFA_F_PERMANENT) &&
2733 !(ipv6_addr_type(&ifa->addr) & IPV6_ADDR_LINKLOCAL)) {
2734 list_move_tail(&ifa->if_list, &keep_list);
2735
2736 /* If not doing DAD on this address, just keep it. */
2737 if ((dev->flags&(IFF_NOARP|IFF_LOOPBACK)) ||
2738 idev->cnf.accept_dad <= 0 ||
2739 (ifa->flags & IFA_F_NODAD))
2740 continue;
2741
2742 /* If it was tentative already, no need to notify */
2743 if (ifa->flags & IFA_F_TENTATIVE)
2744 continue;
2745
2746 /* Flag it for later restoration when link comes up */
2747 ifa->flags |= IFA_F_TENTATIVE;
2748 ifa->state = INET6_IFADDR_STATE_DAD;
2749 } else {
2750 list_del(&ifa->if_list);
2751
2752 /* clear hash table */
2753 spin_lock_bh(&addrconf_hash_lock);
2754 hlist_del_init_rcu(&ifa->addr_lst);
2755 spin_unlock_bh(&addrconf_hash_lock);
2756
2757 write_unlock_bh(&idev->lock);
2758 spin_lock_bh(&ifa->state_lock);
2759 state = ifa->state;
2760 ifa->state = INET6_IFADDR_STATE_DEAD;
2761 spin_unlock_bh(&ifa->state_lock);
2762
2763 if (state != INET6_IFADDR_STATE_DEAD) {
2764 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2765 atomic_notifier_call_chain(&inet6addr_chain,
2766 NETDEV_DOWN, ifa);
2767 }
2768
2769 in6_ifa_put(ifa);
2770 write_lock_bh(&idev->lock);
2771 }
2772 }
2773
2774 list_splice(&keep_list, &idev->addr_list);
2775
2776 write_unlock_bh(&idev->lock);
2777
2778 /* Step 5: Discard multicast list */
2779 if (how)
2780 ipv6_mc_destroy_dev(idev);
2781 else
2782 ipv6_mc_down(idev);
2783
2784 idev->tstamp = jiffies;
2785
2786 /* Last: Shot the device (if unregistered) */
2787 if (how) {
2788 addrconf_sysctl_unregister(idev);
2789 neigh_parms_release(&nd_tbl, idev->nd_parms);
2790 neigh_ifdown(&nd_tbl, dev);
2791 in6_dev_put(idev);
2792 }
2793 return 0;
2794 }
2795
2796 static void addrconf_rs_timer(unsigned long data)
2797 {
2798 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2799 struct inet6_dev *idev = ifp->idev;
2800
2801 read_lock(&idev->lock);
2802 if (idev->dead || !(idev->if_flags & IF_READY))
2803 goto out;
2804
2805 if (idev->cnf.forwarding)
2806 goto out;
2807
2808 /* Announcement received after solicitation was sent */
2809 if (idev->if_flags & IF_RA_RCVD)
2810 goto out;
2811
2812 spin_lock(&ifp->lock);
2813 if (ifp->probes++ < idev->cnf.rtr_solicits) {
2814 /* The wait after the last probe can be shorter */
2815 addrconf_mod_timer(ifp, AC_RS,
2816 (ifp->probes == idev->cnf.rtr_solicits) ?
2817 idev->cnf.rtr_solicit_delay :
2818 idev->cnf.rtr_solicit_interval);
2819 spin_unlock(&ifp->lock);
2820
2821 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2822 } else {
2823 spin_unlock(&ifp->lock);
2824 /*
2825 * Note: we do not support deprecated "all on-link"
2826 * assumption any longer.
2827 */
2828 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2829 idev->dev->name);
2830 }
2831
2832 out:
2833 read_unlock(&idev->lock);
2834 in6_ifa_put(ifp);
2835 }
2836
2837 /*
2838 * Duplicate Address Detection
2839 */
2840 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2841 {
2842 unsigned long rand_num;
2843 struct inet6_dev *idev = ifp->idev;
2844
2845 if (ifp->flags & IFA_F_OPTIMISTIC)
2846 rand_num = 0;
2847 else
2848 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2849
2850 ifp->probes = idev->cnf.dad_transmits;
2851 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2852 }
2853
2854 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2855 {
2856 struct inet6_dev *idev = ifp->idev;
2857 struct net_device *dev = idev->dev;
2858
2859 addrconf_join_solict(dev, &ifp->addr);
2860
2861 net_srandom(ifp->addr.s6_addr32[3]);
2862
2863 read_lock_bh(&idev->lock);
2864 spin_lock(&ifp->lock);
2865 if (ifp->state == INET6_IFADDR_STATE_DEAD)
2866 goto out;
2867
2868 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2869 idev->cnf.accept_dad < 1 ||
2870 !(ifp->flags&IFA_F_TENTATIVE) ||
2871 ifp->flags & IFA_F_NODAD) {
2872 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
2873 spin_unlock(&ifp->lock);
2874 read_unlock_bh(&idev->lock);
2875
2876 addrconf_dad_completed(ifp);
2877 return;
2878 }
2879
2880 if (!(idev->if_flags & IF_READY)) {
2881 spin_unlock(&ifp->lock);
2882 read_unlock_bh(&idev->lock);
2883 /*
2884 * If the device is not ready:
2885 * - keep it tentative if it is a permanent address.
2886 * - otherwise, kill it.
2887 */
2888 in6_ifa_hold(ifp);
2889 addrconf_dad_stop(ifp, 0);
2890 return;
2891 }
2892
2893 /*
2894 * Optimistic nodes can start receiving
2895 * Frames right away
2896 */
2897 if (ifp->flags & IFA_F_OPTIMISTIC)
2898 ip6_ins_rt(ifp->rt);
2899
2900 addrconf_dad_kick(ifp);
2901 out:
2902 spin_unlock(&ifp->lock);
2903 read_unlock_bh(&idev->lock);
2904 }
2905
2906 static void addrconf_dad_timer(unsigned long data)
2907 {
2908 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2909 struct inet6_dev *idev = ifp->idev;
2910 struct in6_addr mcaddr;
2911
2912 if (!ifp->probes && addrconf_dad_end(ifp))
2913 goto out;
2914
2915 read_lock(&idev->lock);
2916 if (idev->dead || !(idev->if_flags & IF_READY)) {
2917 read_unlock(&idev->lock);
2918 goto out;
2919 }
2920
2921 spin_lock(&ifp->lock);
2922 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
2923 spin_unlock(&ifp->lock);
2924 read_unlock(&idev->lock);
2925 goto out;
2926 }
2927
2928 if (ifp->probes == 0) {
2929 /*
2930 * DAD was successful
2931 */
2932
2933 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
2934 spin_unlock(&ifp->lock);
2935 read_unlock(&idev->lock);
2936
2937 addrconf_dad_completed(ifp);
2938
2939 goto out;
2940 }
2941
2942 ifp->probes--;
2943 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2944 spin_unlock(&ifp->lock);
2945 read_unlock(&idev->lock);
2946
2947 /* send a neighbour solicitation for our addr */
2948 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2949 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
2950 out:
2951 in6_ifa_put(ifp);
2952 }
2953
2954 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2955 {
2956 struct net_device *dev = ifp->idev->dev;
2957
2958 /*
2959 * Configure the address for reception. Now it is valid.
2960 */
2961
2962 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2963
2964 /* If added prefix is link local and forwarding is off,
2965 start sending router solicitations.
2966 */
2967
2968 if ((ifp->idev->cnf.forwarding == 0 ||
2969 ifp->idev->cnf.forwarding == 2) &&
2970 ifp->idev->cnf.rtr_solicits > 0 &&
2971 (dev->flags&IFF_LOOPBACK) == 0 &&
2972 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2973 /*
2974 * If a host as already performed a random delay
2975 * [...] as part of DAD [...] there is no need
2976 * to delay again before sending the first RS
2977 */
2978 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2979
2980 spin_lock_bh(&ifp->lock);
2981 ifp->probes = 1;
2982 ifp->idev->if_flags |= IF_RS_SENT;
2983 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2984 spin_unlock_bh(&ifp->lock);
2985 }
2986 }
2987
2988 static void addrconf_dad_run(struct inet6_dev *idev)
2989 {
2990 struct inet6_ifaddr *ifp;
2991
2992 read_lock_bh(&idev->lock);
2993 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2994 spin_lock(&ifp->lock);
2995 if (ifp->flags & IFA_F_TENTATIVE &&
2996 ifp->state == INET6_IFADDR_STATE_DAD)
2997 addrconf_dad_kick(ifp);
2998 spin_unlock(&ifp->lock);
2999 }
3000 read_unlock_bh(&idev->lock);
3001 }
3002
3003 #ifdef CONFIG_PROC_FS
3004 struct if6_iter_state {
3005 struct seq_net_private p;
3006 int bucket;
3007 };
3008
3009 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
3010 {
3011 struct inet6_ifaddr *ifa = NULL;
3012 struct if6_iter_state *state = seq->private;
3013 struct net *net = seq_file_net(seq);
3014
3015 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3016 struct hlist_node *n;
3017 hlist_for_each_entry_rcu_bh(ifa, n, &inet6_addr_lst[state->bucket],
3018 addr_lst)
3019 if (net_eq(dev_net(ifa->idev->dev), net))
3020 return ifa;
3021 }
3022 return NULL;
3023 }
3024
3025 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3026 struct inet6_ifaddr *ifa)
3027 {
3028 struct if6_iter_state *state = seq->private;
3029 struct net *net = seq_file_net(seq);
3030 struct hlist_node *n = &ifa->addr_lst;
3031
3032 hlist_for_each_entry_continue_rcu_bh(ifa, n, addr_lst)
3033 if (net_eq(dev_net(ifa->idev->dev), net))
3034 return ifa;
3035
3036 while (++state->bucket < IN6_ADDR_HSIZE) {
3037 hlist_for_each_entry_rcu_bh(ifa, n,
3038 &inet6_addr_lst[state->bucket], addr_lst) {
3039 if (net_eq(dev_net(ifa->idev->dev), net))
3040 return ifa;
3041 }
3042 }
3043
3044 return NULL;
3045 }
3046
3047 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
3048 {
3049 struct inet6_ifaddr *ifa = if6_get_first(seq);
3050
3051 if (ifa)
3052 while (pos && (ifa = if6_get_next(seq, ifa)) != NULL)
3053 --pos;
3054 return pos ? NULL : ifa;
3055 }
3056
3057 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3058 __acquires(rcu_bh)
3059 {
3060 rcu_read_lock_bh();
3061 return if6_get_idx(seq, *pos);
3062 }
3063
3064 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3065 {
3066 struct inet6_ifaddr *ifa;
3067
3068 ifa = if6_get_next(seq, v);
3069 ++*pos;
3070 return ifa;
3071 }
3072
3073 static void if6_seq_stop(struct seq_file *seq, void *v)
3074 __releases(rcu_bh)
3075 {
3076 rcu_read_unlock_bh();
3077 }
3078
3079 static int if6_seq_show(struct seq_file *seq, void *v)
3080 {
3081 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3082 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3083 &ifp->addr,
3084 ifp->idev->dev->ifindex,
3085 ifp->prefix_len,
3086 ifp->scope,
3087 ifp->flags,
3088 ifp->idev->dev->name);
3089 return 0;
3090 }
3091
3092 static const struct seq_operations if6_seq_ops = {
3093 .start = if6_seq_start,
3094 .next = if6_seq_next,
3095 .show = if6_seq_show,
3096 .stop = if6_seq_stop,
3097 };
3098
3099 static int if6_seq_open(struct inode *inode, struct file *file)
3100 {
3101 return seq_open_net(inode, file, &if6_seq_ops,
3102 sizeof(struct if6_iter_state));
3103 }
3104
3105 static const struct file_operations if6_fops = {
3106 .owner = THIS_MODULE,
3107 .open = if6_seq_open,
3108 .read = seq_read,
3109 .llseek = seq_lseek,
3110 .release = seq_release_net,
3111 };
3112
3113 static int __net_init if6_proc_net_init(struct net *net)
3114 {
3115 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
3116 return -ENOMEM;
3117 return 0;
3118 }
3119
3120 static void __net_exit if6_proc_net_exit(struct net *net)
3121 {
3122 proc_net_remove(net, "if_inet6");
3123 }
3124
3125 static struct pernet_operations if6_proc_net_ops = {
3126 .init = if6_proc_net_init,
3127 .exit = if6_proc_net_exit,
3128 };
3129
3130 int __init if6_proc_init(void)
3131 {
3132 return register_pernet_subsys(&if6_proc_net_ops);
3133 }
3134
3135 void if6_proc_exit(void)
3136 {
3137 unregister_pernet_subsys(&if6_proc_net_ops);
3138 }
3139 #endif /* CONFIG_PROC_FS */
3140
3141 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3142 /* Check if address is a home address configured on any interface. */
3143 int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr)
3144 {
3145 int ret = 0;
3146 struct inet6_ifaddr *ifp = NULL;
3147 struct hlist_node *n;
3148 unsigned int hash = ipv6_addr_hash(addr);
3149
3150 rcu_read_lock_bh();
3151 hlist_for_each_entry_rcu_bh(ifp, n, &inet6_addr_lst[hash], addr_lst) {
3152 if (!net_eq(dev_net(ifp->idev->dev), net))
3153 continue;
3154 if (ipv6_addr_equal(&ifp->addr, addr) &&
3155 (ifp->flags & IFA_F_HOMEADDRESS)) {
3156 ret = 1;
3157 break;
3158 }
3159 }
3160 rcu_read_unlock_bh();
3161 return ret;
3162 }
3163 #endif
3164
3165 /*
3166 * Periodic address status verification
3167 */
3168
3169 static void addrconf_verify(unsigned long foo)
3170 {
3171 unsigned long now, next, next_sec, next_sched;
3172 struct inet6_ifaddr *ifp;
3173 struct hlist_node *node;
3174 int i;
3175
3176 rcu_read_lock_bh();
3177 spin_lock(&addrconf_verify_lock);
3178 now = jiffies;
3179 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3180
3181 del_timer(&addr_chk_timer);
3182
3183 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3184 restart:
3185 hlist_for_each_entry_rcu_bh(ifp, node,
3186 &inet6_addr_lst[i], addr_lst) {
3187 unsigned long age;
3188
3189 if (ifp->flags & IFA_F_PERMANENT)
3190 continue;
3191
3192 spin_lock(&ifp->lock);
3193 /* We try to batch several events at once. */
3194 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3195
3196 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3197 age >= ifp->valid_lft) {
3198 spin_unlock(&ifp->lock);
3199 in6_ifa_hold(ifp);
3200 ipv6_del_addr(ifp);
3201 goto restart;
3202 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3203 spin_unlock(&ifp->lock);
3204 continue;
3205 } else if (age >= ifp->prefered_lft) {
3206 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3207 int deprecate = 0;
3208
3209 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3210 deprecate = 1;
3211 ifp->flags |= IFA_F_DEPRECATED;
3212 }
3213
3214 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3215 next = ifp->tstamp + ifp->valid_lft * HZ;
3216
3217 spin_unlock(&ifp->lock);
3218
3219 if (deprecate) {
3220 in6_ifa_hold(ifp);
3221
3222 ipv6_ifa_notify(0, ifp);
3223 in6_ifa_put(ifp);
3224 goto restart;
3225 }
3226 #ifdef CONFIG_IPV6_PRIVACY
3227 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3228 !(ifp->flags&IFA_F_TENTATIVE)) {
3229 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3230 ifp->idev->cnf.dad_transmits *
3231 ifp->idev->nd_parms->retrans_time / HZ;
3232
3233 if (age >= ifp->prefered_lft - regen_advance) {
3234 struct inet6_ifaddr *ifpub = ifp->ifpub;
3235 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3236 next = ifp->tstamp + ifp->prefered_lft * HZ;
3237 if (!ifp->regen_count && ifpub) {
3238 ifp->regen_count++;
3239 in6_ifa_hold(ifp);
3240 in6_ifa_hold(ifpub);
3241 spin_unlock(&ifp->lock);
3242
3243 spin_lock(&ifpub->lock);
3244 ifpub->regen_count = 0;
3245 spin_unlock(&ifpub->lock);
3246 ipv6_create_tempaddr(ifpub, ifp);
3247 in6_ifa_put(ifpub);
3248 in6_ifa_put(ifp);
3249 goto restart;
3250 }
3251 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3252 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3253 spin_unlock(&ifp->lock);
3254 #endif
3255 } else {
3256 /* ifp->prefered_lft <= ifp->valid_lft */
3257 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3258 next = ifp->tstamp + ifp->prefered_lft * HZ;
3259 spin_unlock(&ifp->lock);
3260 }
3261 }
3262 }
3263
3264 next_sec = round_jiffies_up(next);
3265 next_sched = next;
3266
3267 /* If rounded timeout is accurate enough, accept it. */
3268 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3269 next_sched = next_sec;
3270
3271 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3272 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3273 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3274
3275 ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3276 now, next, next_sec, next_sched));
3277
3278 addr_chk_timer.expires = next_sched;
3279 add_timer(&addr_chk_timer);
3280 spin_unlock(&addrconf_verify_lock);
3281 rcu_read_unlock_bh();
3282 }
3283
3284 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3285 {
3286 struct in6_addr *pfx = NULL;
3287
3288 if (addr)
3289 pfx = nla_data(addr);
3290
3291 if (local) {
3292 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3293 pfx = NULL;
3294 else
3295 pfx = nla_data(local);
3296 }
3297
3298 return pfx;
3299 }
3300
3301 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3302 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3303 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3304 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3305 };
3306
3307 static int
3308 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3309 {
3310 struct net *net = sock_net(skb->sk);
3311 struct ifaddrmsg *ifm;
3312 struct nlattr *tb[IFA_MAX+1];
3313 struct in6_addr *pfx;
3314 int err;
3315
3316 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3317 if (err < 0)
3318 return err;
3319
3320 ifm = nlmsg_data(nlh);
3321 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3322 if (pfx == NULL)
3323 return -EINVAL;
3324
3325 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3326 }
3327
3328 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3329 u32 prefered_lft, u32 valid_lft)
3330 {
3331 u32 flags;
3332 clock_t expires;
3333 unsigned long timeout;
3334
3335 if (!valid_lft || (prefered_lft > valid_lft))
3336 return -EINVAL;
3337
3338 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3339 if (addrconf_finite_timeout(timeout)) {
3340 expires = jiffies_to_clock_t(timeout * HZ);
3341 valid_lft = timeout;
3342 flags = RTF_EXPIRES;
3343 } else {
3344 expires = 0;
3345 flags = 0;
3346 ifa_flags |= IFA_F_PERMANENT;
3347 }
3348
3349 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3350 if (addrconf_finite_timeout(timeout)) {
3351 if (timeout == 0)
3352 ifa_flags |= IFA_F_DEPRECATED;
3353 prefered_lft = timeout;
3354 }
3355
3356 spin_lock_bh(&ifp->lock);
3357 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3358 ifp->tstamp = jiffies;
3359 ifp->valid_lft = valid_lft;
3360 ifp->prefered_lft = prefered_lft;
3361
3362 spin_unlock_bh(&ifp->lock);
3363 if (!(ifp->flags&IFA_F_TENTATIVE))
3364 ipv6_ifa_notify(0, ifp);
3365
3366 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3367 expires, flags);
3368 addrconf_verify(0);
3369
3370 return 0;
3371 }
3372
3373 static int
3374 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3375 {
3376 struct net *net = sock_net(skb->sk);
3377 struct ifaddrmsg *ifm;
3378 struct nlattr *tb[IFA_MAX+1];
3379 struct in6_addr *pfx;
3380 struct inet6_ifaddr *ifa;
3381 struct net_device *dev;
3382 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3383 u8 ifa_flags;
3384 int err;
3385
3386 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3387 if (err < 0)
3388 return err;
3389
3390 ifm = nlmsg_data(nlh);
3391 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3392 if (pfx == NULL)
3393 return -EINVAL;
3394
3395 if (tb[IFA_CACHEINFO]) {
3396 struct ifa_cacheinfo *ci;
3397
3398 ci = nla_data(tb[IFA_CACHEINFO]);
3399 valid_lft = ci->ifa_valid;
3400 preferred_lft = ci->ifa_prefered;
3401 } else {
3402 preferred_lft = INFINITY_LIFE_TIME;
3403 valid_lft = INFINITY_LIFE_TIME;
3404 }
3405
3406 dev = __dev_get_by_index(net, ifm->ifa_index);
3407 if (dev == NULL)
3408 return -ENODEV;
3409
3410 /* We ignore other flags so far. */
3411 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3412
3413 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3414 if (ifa == NULL) {
3415 /*
3416 * It would be best to check for !NLM_F_CREATE here but
3417 * userspace alreay relies on not having to provide this.
3418 */
3419 return inet6_addr_add(net, ifm->ifa_index, pfx,
3420 ifm->ifa_prefixlen, ifa_flags,
3421 preferred_lft, valid_lft);
3422 }
3423
3424 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3425 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3426 err = -EEXIST;
3427 else
3428 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3429
3430 in6_ifa_put(ifa);
3431
3432 return err;
3433 }
3434
3435 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3436 u8 scope, int ifindex)
3437 {
3438 struct ifaddrmsg *ifm;
3439
3440 ifm = nlmsg_data(nlh);
3441 ifm->ifa_family = AF_INET6;
3442 ifm->ifa_prefixlen = prefixlen;
3443 ifm->ifa_flags = flags;
3444 ifm->ifa_scope = scope;
3445 ifm->ifa_index = ifindex;
3446 }
3447
3448 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3449 unsigned long tstamp, u32 preferred, u32 valid)
3450 {
3451 struct ifa_cacheinfo ci;
3452
3453 ci.cstamp = cstamp_delta(cstamp);
3454 ci.tstamp = cstamp_delta(tstamp);
3455 ci.ifa_prefered = preferred;
3456 ci.ifa_valid = valid;
3457
3458 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3459 }
3460
3461 static inline int rt_scope(int ifa_scope)
3462 {
3463 if (ifa_scope & IFA_HOST)
3464 return RT_SCOPE_HOST;
3465 else if (ifa_scope & IFA_LINK)
3466 return RT_SCOPE_LINK;
3467 else if (ifa_scope & IFA_SITE)
3468 return RT_SCOPE_SITE;
3469 else
3470 return RT_SCOPE_UNIVERSE;
3471 }
3472
3473 static inline int inet6_ifaddr_msgsize(void)
3474 {
3475 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3476 + nla_total_size(16) /* IFA_ADDRESS */
3477 + nla_total_size(sizeof(struct ifa_cacheinfo));
3478 }
3479
3480 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3481 u32 pid, u32 seq, int event, unsigned int flags)
3482 {
3483 struct nlmsghdr *nlh;
3484 u32 preferred, valid;
3485
3486 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3487 if (nlh == NULL)
3488 return -EMSGSIZE;
3489
3490 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3491 ifa->idev->dev->ifindex);
3492
3493 if (!(ifa->flags&IFA_F_PERMANENT)) {
3494 preferred = ifa->prefered_lft;
3495 valid = ifa->valid_lft;
3496 if (preferred != INFINITY_LIFE_TIME) {
3497 long tval = (jiffies - ifa->tstamp)/HZ;
3498 if (preferred > tval)
3499 preferred -= tval;
3500 else
3501 preferred = 0;
3502 if (valid != INFINITY_LIFE_TIME) {
3503 if (valid > tval)
3504 valid -= tval;
3505 else
3506 valid = 0;
3507 }
3508 }
3509 } else {
3510 preferred = INFINITY_LIFE_TIME;
3511 valid = INFINITY_LIFE_TIME;
3512 }
3513
3514 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3515 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3516 nlmsg_cancel(skb, nlh);
3517 return -EMSGSIZE;
3518 }
3519
3520 return nlmsg_end(skb, nlh);
3521 }
3522
3523 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3524 u32 pid, u32 seq, int event, u16 flags)
3525 {
3526 struct nlmsghdr *nlh;
3527 u8 scope = RT_SCOPE_UNIVERSE;
3528 int ifindex = ifmca->idev->dev->ifindex;
3529
3530 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3531 scope = RT_SCOPE_SITE;
3532
3533 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3534 if (nlh == NULL)
3535 return -EMSGSIZE;
3536
3537 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3538 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3539 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3540 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3541 nlmsg_cancel(skb, nlh);
3542 return -EMSGSIZE;
3543 }
3544
3545 return nlmsg_end(skb, nlh);
3546 }
3547
3548 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3549 u32 pid, u32 seq, int event, unsigned int flags)
3550 {
3551 struct nlmsghdr *nlh;
3552 u8 scope = RT_SCOPE_UNIVERSE;
3553 int ifindex = ifaca->aca_idev->dev->ifindex;
3554
3555 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3556 scope = RT_SCOPE_SITE;
3557
3558 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3559 if (nlh == NULL)
3560 return -EMSGSIZE;
3561
3562 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3563 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3564 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3565 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3566 nlmsg_cancel(skb, nlh);
3567 return -EMSGSIZE;
3568 }
3569
3570 return nlmsg_end(skb, nlh);
3571 }
3572
3573 enum addr_type_t {
3574 UNICAST_ADDR,
3575 MULTICAST_ADDR,
3576 ANYCAST_ADDR,
3577 };
3578
3579 /* called with rcu_read_lock() */
3580 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3581 struct netlink_callback *cb, enum addr_type_t type,
3582 int s_ip_idx, int *p_ip_idx)
3583 {
3584 struct ifmcaddr6 *ifmca;
3585 struct ifacaddr6 *ifaca;
3586 int err = 1;
3587 int ip_idx = *p_ip_idx;
3588
3589 read_lock_bh(&idev->lock);
3590 switch (type) {
3591 case UNICAST_ADDR: {
3592 struct inet6_ifaddr *ifa;
3593
3594 /* unicast address incl. temp addr */
3595 list_for_each_entry(ifa, &idev->addr_list, if_list) {
3596 if (++ip_idx < s_ip_idx)
3597 continue;
3598 err = inet6_fill_ifaddr(skb, ifa,
3599 NETLINK_CB(cb->skb).pid,
3600 cb->nlh->nlmsg_seq,
3601 RTM_NEWADDR,
3602 NLM_F_MULTI);
3603 if (err <= 0)
3604 break;
3605 }
3606 break;
3607 }
3608 case MULTICAST_ADDR:
3609 /* multicast address */
3610 for (ifmca = idev->mc_list; ifmca;
3611 ifmca = ifmca->next, ip_idx++) {
3612 if (ip_idx < s_ip_idx)
3613 continue;
3614 err = inet6_fill_ifmcaddr(skb, ifmca,
3615 NETLINK_CB(cb->skb).pid,
3616 cb->nlh->nlmsg_seq,
3617 RTM_GETMULTICAST,
3618 NLM_F_MULTI);
3619 if (err <= 0)
3620 break;
3621 }
3622 break;
3623 case ANYCAST_ADDR:
3624 /* anycast address */
3625 for (ifaca = idev->ac_list; ifaca;
3626 ifaca = ifaca->aca_next, ip_idx++) {
3627 if (ip_idx < s_ip_idx)
3628 continue;
3629 err = inet6_fill_ifacaddr(skb, ifaca,
3630 NETLINK_CB(cb->skb).pid,
3631 cb->nlh->nlmsg_seq,
3632 RTM_GETANYCAST,
3633 NLM_F_MULTI);
3634 if (err <= 0)
3635 break;
3636 }
3637 break;
3638 default:
3639 break;
3640 }
3641 read_unlock_bh(&idev->lock);
3642 *p_ip_idx = ip_idx;
3643 return err;
3644 }
3645
3646 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3647 enum addr_type_t type)
3648 {
3649 struct net *net = sock_net(skb->sk);
3650 int h, s_h;
3651 int idx, ip_idx;
3652 int s_idx, s_ip_idx;
3653 struct net_device *dev;
3654 struct inet6_dev *idev;
3655 struct hlist_head *head;
3656 struct hlist_node *node;
3657
3658 s_h = cb->args[0];
3659 s_idx = idx = cb->args[1];
3660 s_ip_idx = ip_idx = cb->args[2];
3661
3662 rcu_read_lock();
3663 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3664 idx = 0;
3665 head = &net->dev_index_head[h];
3666 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3667 if (idx < s_idx)
3668 goto cont;
3669 if (h > s_h || idx > s_idx)
3670 s_ip_idx = 0;
3671 ip_idx = 0;
3672 idev = __in6_dev_get(dev);
3673 if (!idev)
3674 goto cont;
3675
3676 if (in6_dump_addrs(idev, skb, cb, type,
3677 s_ip_idx, &ip_idx) <= 0)
3678 goto done;
3679 cont:
3680 idx++;
3681 }
3682 }
3683 done:
3684 rcu_read_unlock();
3685 cb->args[0] = h;
3686 cb->args[1] = idx;
3687 cb->args[2] = ip_idx;
3688
3689 return skb->len;
3690 }
3691
3692 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3693 {
3694 enum addr_type_t type = UNICAST_ADDR;
3695
3696 return inet6_dump_addr(skb, cb, type);
3697 }
3698
3699 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3700 {
3701 enum addr_type_t type = MULTICAST_ADDR;
3702
3703 return inet6_dump_addr(skb, cb, type);
3704 }
3705
3706
3707 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3708 {
3709 enum addr_type_t type = ANYCAST_ADDR;
3710
3711 return inet6_dump_addr(skb, cb, type);
3712 }
3713
3714 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3715 void *arg)
3716 {
3717 struct net *net = sock_net(in_skb->sk);
3718 struct ifaddrmsg *ifm;
3719 struct nlattr *tb[IFA_MAX+1];
3720 struct in6_addr *addr = NULL;
3721 struct net_device *dev = NULL;
3722 struct inet6_ifaddr *ifa;
3723 struct sk_buff *skb;
3724 int err;
3725
3726 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3727 if (err < 0)
3728 goto errout;
3729
3730 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3731 if (addr == NULL) {
3732 err = -EINVAL;
3733 goto errout;
3734 }
3735
3736 ifm = nlmsg_data(nlh);
3737 if (ifm->ifa_index)
3738 dev = __dev_get_by_index(net, ifm->ifa_index);
3739
3740 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
3741 if (!ifa) {
3742 err = -EADDRNOTAVAIL;
3743 goto errout;
3744 }
3745
3746 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
3747 if (!skb) {
3748 err = -ENOBUFS;
3749 goto errout_ifa;
3750 }
3751
3752 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3753 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3754 if (err < 0) {
3755 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3756 WARN_ON(err == -EMSGSIZE);
3757 kfree_skb(skb);
3758 goto errout_ifa;
3759 }
3760 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
3761 errout_ifa:
3762 in6_ifa_put(ifa);
3763 errout:
3764 return err;
3765 }
3766
3767 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3768 {
3769 struct sk_buff *skb;
3770 struct net *net = dev_net(ifa->idev->dev);
3771 int err = -ENOBUFS;
3772
3773 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3774 if (skb == NULL)
3775 goto errout;
3776
3777 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3778 if (err < 0) {
3779 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3780 WARN_ON(err == -EMSGSIZE);
3781 kfree_skb(skb);
3782 goto errout;
3783 }
3784 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3785 return;
3786 errout:
3787 if (err < 0)
3788 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3789 }
3790
3791 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3792 __s32 *array, int bytes)
3793 {
3794 BUG_ON(bytes < (DEVCONF_MAX * 4));
3795
3796 memset(array, 0, bytes);
3797 array[DEVCONF_FORWARDING] = cnf->forwarding;
3798 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3799 array[DEVCONF_MTU6] = cnf->mtu6;
3800 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3801 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3802 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3803 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3804 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3805 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
3806 jiffies_to_msecs(cnf->rtr_solicit_interval);
3807 array[DEVCONF_RTR_SOLICIT_DELAY] =
3808 jiffies_to_msecs(cnf->rtr_solicit_delay);
3809 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3810 #ifdef CONFIG_IPV6_PRIVACY
3811 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3812 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3813 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3814 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3815 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3816 #endif
3817 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3818 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3819 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3820 #ifdef CONFIG_IPV6_ROUTER_PREF
3821 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3822 array[DEVCONF_RTR_PROBE_INTERVAL] =
3823 jiffies_to_msecs(cnf->rtr_probe_interval);
3824 #ifdef CONFIG_IPV6_ROUTE_INFO
3825 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3826 #endif
3827 #endif
3828 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3829 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3830 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3831 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3832 #endif
3833 #ifdef CONFIG_IPV6_MROUTE
3834 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
3835 #endif
3836 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
3837 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
3838 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
3839 }
3840
3841 static inline size_t inet6_if_nlmsg_size(void)
3842 {
3843 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3844 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3845 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3846 + nla_total_size(4) /* IFLA_MTU */
3847 + nla_total_size(4) /* IFLA_LINK */
3848 + nla_total_size( /* IFLA_PROTINFO */
3849 nla_total_size(4) /* IFLA_INET6_FLAGS */
3850 + nla_total_size(sizeof(struct ifla_cacheinfo))
3851 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3852 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3853 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
3854 );
3855 }
3856
3857 static inline void __snmp6_fill_stats(u64 *stats, void __percpu **mib,
3858 int items, int bytes)
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_field(mib, i), &stats[i]);
3868
3869 memset(&stats[items], 0, pad);
3870 }
3871
3872 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib,
3873 int items, int bytes, size_t syncpoff)
3874 {
3875 int i;
3876 int pad = bytes - sizeof(u64) * items;
3877 BUG_ON(pad < 0);
3878
3879 /* Use put_unaligned() because stats may not be aligned for u64. */
3880 put_unaligned(items, &stats[0]);
3881 for (i = 1; i < items; i++)
3882 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
3883
3884 memset(&stats[items], 0, pad);
3885 }
3886
3887 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3888 int bytes)
3889 {
3890 switch (attrtype) {
3891 case IFLA_INET6_STATS:
3892 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6,
3893 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
3894 break;
3895 case IFLA_INET6_ICMP6STATS:
3896 __snmp6_fill_stats(stats, (void __percpu **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
3897 break;
3898 }
3899 }
3900
3901 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3902 u32 pid, u32 seq, int event, unsigned int flags)
3903 {
3904 struct net_device *dev = idev->dev;
3905 struct nlattr *nla;
3906 struct ifinfomsg *hdr;
3907 struct nlmsghdr *nlh;
3908 void *protoinfo;
3909 struct ifla_cacheinfo ci;
3910
3911 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3912 if (nlh == NULL)
3913 return -EMSGSIZE;
3914
3915 hdr = nlmsg_data(nlh);
3916 hdr->ifi_family = AF_INET6;
3917 hdr->__ifi_pad = 0;
3918 hdr->ifi_type = dev->type;
3919 hdr->ifi_index = dev->ifindex;
3920 hdr->ifi_flags = dev_get_flags(dev);
3921 hdr->ifi_change = 0;
3922
3923 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
3924
3925 if (dev->addr_len)
3926 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3927
3928 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
3929 if (dev->ifindex != dev->iflink)
3930 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
3931
3932 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3933 if (protoinfo == NULL)
3934 goto nla_put_failure;
3935
3936 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
3937
3938 ci.max_reasm_len = IPV6_MAXPLEN;
3939 ci.tstamp = cstamp_delta(idev->tstamp);
3940 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
3941 ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time);
3942 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3943
3944 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3945 if (nla == NULL)
3946 goto nla_put_failure;
3947 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
3948
3949 /* XXX - MC not implemented */
3950
3951 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3952 if (nla == NULL)
3953 goto nla_put_failure;
3954 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3955
3956 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3957 if (nla == NULL)
3958 goto nla_put_failure;
3959 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
3960
3961 nla_nest_end(skb, protoinfo);
3962 return nlmsg_end(skb, nlh);
3963
3964 nla_put_failure:
3965 nlmsg_cancel(skb, nlh);
3966 return -EMSGSIZE;
3967 }
3968
3969 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3970 {
3971 struct net *net = sock_net(skb->sk);
3972 int h, s_h;
3973 int idx = 0, s_idx;
3974 struct net_device *dev;
3975 struct inet6_dev *idev;
3976 struct hlist_head *head;
3977 struct hlist_node *node;
3978
3979 s_h = cb->args[0];
3980 s_idx = cb->args[1];
3981
3982 rcu_read_lock();
3983 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3984 idx = 0;
3985 head = &net->dev_index_head[h];
3986 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3987 if (idx < s_idx)
3988 goto cont;
3989 idev = __in6_dev_get(dev);
3990 if (!idev)
3991 goto cont;
3992 if (inet6_fill_ifinfo(skb, idev,
3993 NETLINK_CB(cb->skb).pid,
3994 cb->nlh->nlmsg_seq,
3995 RTM_NEWLINK, NLM_F_MULTI) <= 0)
3996 goto out;
3997 cont:
3998 idx++;
3999 }
4000 }
4001 out:
4002 rcu_read_unlock();
4003 cb->args[1] = idx;
4004 cb->args[0] = h;
4005
4006 return skb->len;
4007 }
4008
4009 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4010 {
4011 struct sk_buff *skb;
4012 struct net *net = dev_net(idev->dev);
4013 int err = -ENOBUFS;
4014
4015 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
4016 if (skb == NULL)
4017 goto errout;
4018
4019 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
4020 if (err < 0) {
4021 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4022 WARN_ON(err == -EMSGSIZE);
4023 kfree_skb(skb);
4024 goto errout;
4025 }
4026 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
4027 return;
4028 errout:
4029 if (err < 0)
4030 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
4031 }
4032
4033 static inline size_t inet6_prefix_nlmsg_size(void)
4034 {
4035 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4036 + nla_total_size(sizeof(struct in6_addr))
4037 + nla_total_size(sizeof(struct prefix_cacheinfo));
4038 }
4039
4040 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
4041 struct prefix_info *pinfo, u32 pid, u32 seq,
4042 int event, unsigned int flags)
4043 {
4044 struct prefixmsg *pmsg;
4045 struct nlmsghdr *nlh;
4046 struct prefix_cacheinfo ci;
4047
4048 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
4049 if (nlh == NULL)
4050 return -EMSGSIZE;
4051
4052 pmsg = nlmsg_data(nlh);
4053 pmsg->prefix_family = AF_INET6;
4054 pmsg->prefix_pad1 = 0;
4055 pmsg->prefix_pad2 = 0;
4056 pmsg->prefix_ifindex = idev->dev->ifindex;
4057 pmsg->prefix_len = pinfo->prefix_len;
4058 pmsg->prefix_type = pinfo->type;
4059 pmsg->prefix_pad3 = 0;
4060 pmsg->prefix_flags = 0;
4061 if (pinfo->onlink)
4062 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4063 if (pinfo->autoconf)
4064 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4065
4066 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
4067
4068 ci.preferred_time = ntohl(pinfo->prefered);
4069 ci.valid_time = ntohl(pinfo->valid);
4070 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
4071
4072 return nlmsg_end(skb, nlh);
4073
4074 nla_put_failure:
4075 nlmsg_cancel(skb, nlh);
4076 return -EMSGSIZE;
4077 }
4078
4079 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
4080 struct prefix_info *pinfo)
4081 {
4082 struct sk_buff *skb;
4083 struct net *net = dev_net(idev->dev);
4084 int err = -ENOBUFS;
4085
4086 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
4087 if (skb == NULL)
4088 goto errout;
4089
4090 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
4091 if (err < 0) {
4092 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4093 WARN_ON(err == -EMSGSIZE);
4094 kfree_skb(skb);
4095 goto errout;
4096 }
4097 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4098 return;
4099 errout:
4100 if (err < 0)
4101 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
4102 }
4103
4104 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4105 {
4106 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4107
4108 switch (event) {
4109 case RTM_NEWADDR:
4110 /*
4111 * If the address was optimistic
4112 * we inserted the route at the start of
4113 * our DAD process, so we don't need
4114 * to do it again
4115 */
4116 if (!(ifp->rt->rt6i_node))
4117 ip6_ins_rt(ifp->rt);
4118 if (ifp->idev->cnf.forwarding)
4119 addrconf_join_anycast(ifp);
4120 break;
4121 case RTM_DELADDR:
4122 if (ifp->idev->cnf.forwarding)
4123 addrconf_leave_anycast(ifp);
4124 addrconf_leave_solict(ifp->idev, &ifp->addr);
4125 dst_hold(&ifp->rt->dst);
4126
4127 if (ifp->state == INET6_IFADDR_STATE_DEAD &&
4128 ip6_del_rt(ifp->rt))
4129 dst_free(&ifp->rt->dst);
4130 break;
4131 }
4132 }
4133
4134 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4135 {
4136 rcu_read_lock_bh();
4137 if (likely(ifp->idev->dead == 0))
4138 __ipv6_ifa_notify(event, ifp);
4139 rcu_read_unlock_bh();
4140 }
4141
4142 #ifdef CONFIG_SYSCTL
4143
4144 static
4145 int addrconf_sysctl_forward(ctl_table *ctl, int write,
4146 void __user *buffer, size_t *lenp, loff_t *ppos)
4147 {
4148 int *valp = ctl->data;
4149 int val = *valp;
4150 loff_t pos = *ppos;
4151 int ret;
4152
4153 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
4154
4155 if (write)
4156 ret = addrconf_fixup_forwarding(ctl, valp, val);
4157 if (ret)
4158 *ppos = pos;
4159 return ret;
4160 }
4161
4162 static void dev_disable_change(struct inet6_dev *idev)
4163 {
4164 if (!idev || !idev->dev)
4165 return;
4166
4167 if (idev->cnf.disable_ipv6)
4168 addrconf_notify(NULL, NETDEV_DOWN, idev->dev);
4169 else
4170 addrconf_notify(NULL, NETDEV_UP, idev->dev);
4171 }
4172
4173 static void addrconf_disable_change(struct net *net, __s32 newf)
4174 {
4175 struct net_device *dev;
4176 struct inet6_dev *idev;
4177
4178 rcu_read_lock();
4179 for_each_netdev_rcu(net, dev) {
4180 idev = __in6_dev_get(dev);
4181 if (idev) {
4182 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4183 idev->cnf.disable_ipv6 = newf;
4184 if (changed)
4185 dev_disable_change(idev);
4186 }
4187 }
4188 rcu_read_unlock();
4189 }
4190
4191 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int old)
4192 {
4193 struct net *net;
4194
4195 net = (struct net *)table->extra2;
4196
4197 if (p == &net->ipv6.devconf_dflt->disable_ipv6)
4198 return 0;
4199
4200 if (!rtnl_trylock()) {
4201 /* Restore the original values before restarting */
4202 *p = old;
4203 return restart_syscall();
4204 }
4205
4206 if (p == &net->ipv6.devconf_all->disable_ipv6) {
4207 __s32 newf = net->ipv6.devconf_all->disable_ipv6;
4208 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4209 addrconf_disable_change(net, newf);
4210 } else if ((!*p) ^ (!old))
4211 dev_disable_change((struct inet6_dev *)table->extra1);
4212
4213 rtnl_unlock();
4214 return 0;
4215 }
4216
4217 static
4218 int addrconf_sysctl_disable(ctl_table *ctl, int write,
4219 void __user *buffer, size_t *lenp, loff_t *ppos)
4220 {
4221 int *valp = ctl->data;
4222 int val = *valp;
4223 loff_t pos = *ppos;
4224 int ret;
4225
4226 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
4227
4228 if (write)
4229 ret = addrconf_disable_ipv6(ctl, valp, val);
4230 if (ret)
4231 *ppos = pos;
4232 return ret;
4233 }
4234
4235 static struct addrconf_sysctl_table
4236 {
4237 struct ctl_table_header *sysctl_header;
4238 ctl_table addrconf_vars[DEVCONF_MAX+1];
4239 char *dev_name;
4240 } addrconf_sysctl __read_mostly = {
4241 .sysctl_header = NULL,
4242 .addrconf_vars = {
4243 {
4244 .procname = "forwarding",
4245 .data = &ipv6_devconf.forwarding,
4246 .maxlen = sizeof(int),
4247 .mode = 0644,
4248 .proc_handler = addrconf_sysctl_forward,
4249 },
4250 {
4251 .procname = "hop_limit",
4252 .data = &ipv6_devconf.hop_limit,
4253 .maxlen = sizeof(int),
4254 .mode = 0644,
4255 .proc_handler = proc_dointvec,
4256 },
4257 {
4258 .procname = "mtu",
4259 .data = &ipv6_devconf.mtu6,
4260 .maxlen = sizeof(int),
4261 .mode = 0644,
4262 .proc_handler = proc_dointvec,
4263 },
4264 {
4265 .procname = "accept_ra",
4266 .data = &ipv6_devconf.accept_ra,
4267 .maxlen = sizeof(int),
4268 .mode = 0644,
4269 .proc_handler = proc_dointvec,
4270 },
4271 {
4272 .procname = "accept_redirects",
4273 .data = &ipv6_devconf.accept_redirects,
4274 .maxlen = sizeof(int),
4275 .mode = 0644,
4276 .proc_handler = proc_dointvec,
4277 },
4278 {
4279 .procname = "autoconf",
4280 .data = &ipv6_devconf.autoconf,
4281 .maxlen = sizeof(int),
4282 .mode = 0644,
4283 .proc_handler = proc_dointvec,
4284 },
4285 {
4286 .procname = "dad_transmits",
4287 .data = &ipv6_devconf.dad_transmits,
4288 .maxlen = sizeof(int),
4289 .mode = 0644,
4290 .proc_handler = proc_dointvec,
4291 },
4292 {
4293 .procname = "router_solicitations",
4294 .data = &ipv6_devconf.rtr_solicits,
4295 .maxlen = sizeof(int),
4296 .mode = 0644,
4297 .proc_handler = proc_dointvec,
4298 },
4299 {
4300 .procname = "router_solicitation_interval",
4301 .data = &ipv6_devconf.rtr_solicit_interval,
4302 .maxlen = sizeof(int),
4303 .mode = 0644,
4304 .proc_handler = proc_dointvec_jiffies,
4305 },
4306 {
4307 .procname = "router_solicitation_delay",
4308 .data = &ipv6_devconf.rtr_solicit_delay,
4309 .maxlen = sizeof(int),
4310 .mode = 0644,
4311 .proc_handler = proc_dointvec_jiffies,
4312 },
4313 {
4314 .procname = "force_mld_version",
4315 .data = &ipv6_devconf.force_mld_version,
4316 .maxlen = sizeof(int),
4317 .mode = 0644,
4318 .proc_handler = proc_dointvec,
4319 },
4320 #ifdef CONFIG_IPV6_PRIVACY
4321 {
4322 .procname = "use_tempaddr",
4323 .data = &ipv6_devconf.use_tempaddr,
4324 .maxlen = sizeof(int),
4325 .mode = 0644,
4326 .proc_handler = proc_dointvec,
4327 },
4328 {
4329 .procname = "temp_valid_lft",
4330 .data = &ipv6_devconf.temp_valid_lft,
4331 .maxlen = sizeof(int),
4332 .mode = 0644,
4333 .proc_handler = proc_dointvec,
4334 },
4335 {
4336 .procname = "temp_prefered_lft",
4337 .data = &ipv6_devconf.temp_prefered_lft,
4338 .maxlen = sizeof(int),
4339 .mode = 0644,
4340 .proc_handler = proc_dointvec,
4341 },
4342 {
4343 .procname = "regen_max_retry",
4344 .data = &ipv6_devconf.regen_max_retry,
4345 .maxlen = sizeof(int),
4346 .mode = 0644,
4347 .proc_handler = proc_dointvec,
4348 },
4349 {
4350 .procname = "max_desync_factor",
4351 .data = &ipv6_devconf.max_desync_factor,
4352 .maxlen = sizeof(int),
4353 .mode = 0644,
4354 .proc_handler = proc_dointvec,
4355 },
4356 #endif
4357 {
4358 .procname = "max_addresses",
4359 .data = &ipv6_devconf.max_addresses,
4360 .maxlen = sizeof(int),
4361 .mode = 0644,
4362 .proc_handler = proc_dointvec,
4363 },
4364 {
4365 .procname = "accept_ra_defrtr",
4366 .data = &ipv6_devconf.accept_ra_defrtr,
4367 .maxlen = sizeof(int),
4368 .mode = 0644,
4369 .proc_handler = proc_dointvec,
4370 },
4371 {
4372 .procname = "accept_ra_pinfo",
4373 .data = &ipv6_devconf.accept_ra_pinfo,
4374 .maxlen = sizeof(int),
4375 .mode = 0644,
4376 .proc_handler = proc_dointvec,
4377 },
4378 #ifdef CONFIG_IPV6_ROUTER_PREF
4379 {
4380 .procname = "accept_ra_rtr_pref",
4381 .data = &ipv6_devconf.accept_ra_rtr_pref,
4382 .maxlen = sizeof(int),
4383 .mode = 0644,
4384 .proc_handler = proc_dointvec,
4385 },
4386 {
4387 .procname = "router_probe_interval",
4388 .data = &ipv6_devconf.rtr_probe_interval,
4389 .maxlen = sizeof(int),
4390 .mode = 0644,
4391 .proc_handler = proc_dointvec_jiffies,
4392 },
4393 #ifdef CONFIG_IPV6_ROUTE_INFO
4394 {
4395 .procname = "accept_ra_rt_info_max_plen",
4396 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4397 .maxlen = sizeof(int),
4398 .mode = 0644,
4399 .proc_handler = proc_dointvec,
4400 },
4401 #endif
4402 #endif
4403 {
4404 .procname = "proxy_ndp",
4405 .data = &ipv6_devconf.proxy_ndp,
4406 .maxlen = sizeof(int),
4407 .mode = 0644,
4408 .proc_handler = proc_dointvec,
4409 },
4410 {
4411 .procname = "accept_source_route",
4412 .data = &ipv6_devconf.accept_source_route,
4413 .maxlen = sizeof(int),
4414 .mode = 0644,
4415 .proc_handler = proc_dointvec,
4416 },
4417 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4418 {
4419 .procname = "optimistic_dad",
4420 .data = &ipv6_devconf.optimistic_dad,
4421 .maxlen = sizeof(int),
4422 .mode = 0644,
4423 .proc_handler = proc_dointvec,
4424
4425 },
4426 #endif
4427 #ifdef CONFIG_IPV6_MROUTE
4428 {
4429 .procname = "mc_forwarding",
4430 .data = &ipv6_devconf.mc_forwarding,
4431 .maxlen = sizeof(int),
4432 .mode = 0444,
4433 .proc_handler = proc_dointvec,
4434 },
4435 #endif
4436 {
4437 .procname = "disable_ipv6",
4438 .data = &ipv6_devconf.disable_ipv6,
4439 .maxlen = sizeof(int),
4440 .mode = 0644,
4441 .proc_handler = addrconf_sysctl_disable,
4442 },
4443 {
4444 .procname = "accept_dad",
4445 .data = &ipv6_devconf.accept_dad,
4446 .maxlen = sizeof(int),
4447 .mode = 0644,
4448 .proc_handler = proc_dointvec,
4449 },
4450 {
4451 .procname = "force_tllao",
4452 .data = &ipv6_devconf.force_tllao,
4453 .maxlen = sizeof(int),
4454 .mode = 0644,
4455 .proc_handler = proc_dointvec
4456 },
4457 {
4458 /* sentinel */
4459 }
4460 },
4461 };
4462
4463 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4464 struct inet6_dev *idev, struct ipv6_devconf *p)
4465 {
4466 int i;
4467 struct addrconf_sysctl_table *t;
4468
4469 #define ADDRCONF_CTL_PATH_DEV 3
4470
4471 struct ctl_path addrconf_ctl_path[] = {
4472 { .procname = "net", },
4473 { .procname = "ipv6", },
4474 { .procname = "conf", },
4475 { /* to be set */ },
4476 { },
4477 };
4478
4479
4480 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4481 if (t == NULL)
4482 goto out;
4483
4484 for (i = 0; t->addrconf_vars[i].data; i++) {
4485 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
4486 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4487 t->addrconf_vars[i].extra2 = net;
4488 }
4489
4490 /*
4491 * Make a copy of dev_name, because '.procname' is regarded as const
4492 * by sysctl and we wouldn't want anyone to change it under our feet
4493 * (see SIOCSIFNAME).
4494 */
4495 t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4496 if (!t->dev_name)
4497 goto free;
4498
4499 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
4500
4501 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
4502 t->addrconf_vars);
4503 if (t->sysctl_header == NULL)
4504 goto free_procname;
4505
4506 p->sysctl = t;
4507 return 0;
4508
4509 free_procname:
4510 kfree(t->dev_name);
4511 free:
4512 kfree(t);
4513 out:
4514 return -ENOBUFS;
4515 }
4516
4517 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4518 {
4519 struct addrconf_sysctl_table *t;
4520
4521 if (p->sysctl == NULL)
4522 return;
4523
4524 t = p->sysctl;
4525 p->sysctl = NULL;
4526 unregister_sysctl_table(t->sysctl_header);
4527 kfree(t->dev_name);
4528 kfree(t);
4529 }
4530
4531 static void addrconf_sysctl_register(struct inet6_dev *idev)
4532 {
4533 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
4534 &ndisc_ifinfo_sysctl_change);
4535 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
4536 idev, &idev->cnf);
4537 }
4538
4539 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
4540 {
4541 __addrconf_sysctl_unregister(&idev->cnf);
4542 neigh_sysctl_unregister(idev->nd_parms);
4543 }
4544
4545
4546 #endif
4547
4548 static int __net_init addrconf_init_net(struct net *net)
4549 {
4550 int err;
4551 struct ipv6_devconf *all, *dflt;
4552
4553 err = -ENOMEM;
4554 all = &ipv6_devconf;
4555 dflt = &ipv6_devconf_dflt;
4556
4557 if (!net_eq(net, &init_net)) {
4558 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4559 if (all == NULL)
4560 goto err_alloc_all;
4561
4562 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4563 if (dflt == NULL)
4564 goto err_alloc_dflt;
4565 } else {
4566 /* these will be inherited by all namespaces */
4567 dflt->autoconf = ipv6_defaults.autoconf;
4568 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
4569 }
4570
4571 net->ipv6.devconf_all = all;
4572 net->ipv6.devconf_dflt = dflt;
4573
4574 #ifdef CONFIG_SYSCTL
4575 err = __addrconf_sysctl_register(net, "all", NULL, all);
4576 if (err < 0)
4577 goto err_reg_all;
4578
4579 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
4580 if (err < 0)
4581 goto err_reg_dflt;
4582 #endif
4583 return 0;
4584
4585 #ifdef CONFIG_SYSCTL
4586 err_reg_dflt:
4587 __addrconf_sysctl_unregister(all);
4588 err_reg_all:
4589 kfree(dflt);
4590 #endif
4591 err_alloc_dflt:
4592 kfree(all);
4593 err_alloc_all:
4594 return err;
4595 }
4596
4597 static void __net_exit addrconf_exit_net(struct net *net)
4598 {
4599 #ifdef CONFIG_SYSCTL
4600 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4601 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4602 #endif
4603 if (!net_eq(net, &init_net)) {
4604 kfree(net->ipv6.devconf_dflt);
4605 kfree(net->ipv6.devconf_all);
4606 }
4607 }
4608
4609 static struct pernet_operations addrconf_ops = {
4610 .init = addrconf_init_net,
4611 .exit = addrconf_exit_net,
4612 };
4613
4614 /*
4615 * Device notifier
4616 */
4617
4618 int register_inet6addr_notifier(struct notifier_block *nb)
4619 {
4620 return atomic_notifier_chain_register(&inet6addr_chain, nb);
4621 }
4622 EXPORT_SYMBOL(register_inet6addr_notifier);
4623
4624 int unregister_inet6addr_notifier(struct notifier_block *nb)
4625 {
4626 return atomic_notifier_chain_unregister(&inet6addr_chain, nb);
4627 }
4628 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4629
4630 /*
4631 * Init / cleanup code
4632 */
4633
4634 int __init addrconf_init(void)
4635 {
4636 int i, err;
4637
4638 err = ipv6_addr_label_init();
4639 if (err < 0) {
4640 printk(KERN_CRIT "IPv6 Addrconf:"
4641 " cannot initialize default policy table: %d.\n", err);
4642 goto out;
4643 }
4644
4645 err = register_pernet_subsys(&addrconf_ops);
4646 if (err < 0)
4647 goto out_addrlabel;
4648
4649 /* The addrconf netdev notifier requires that loopback_dev
4650 * has it's ipv6 private information allocated and setup
4651 * before it can bring up and give link-local addresses
4652 * to other devices which are up.
4653 *
4654 * Unfortunately, loopback_dev is not necessarily the first
4655 * entry in the global dev_base list of net devices. In fact,
4656 * it is likely to be the very last entry on that list.
4657 * So this causes the notifier registry below to try and
4658 * give link-local addresses to all devices besides loopback_dev
4659 * first, then loopback_dev, which cases all the non-loopback_dev
4660 * devices to fail to get a link-local address.
4661 *
4662 * So, as a temporary fix, allocate the ipv6 structure for
4663 * loopback_dev first by hand.
4664 * Longer term, all of the dependencies ipv6 has upon the loopback
4665 * device and it being up should be removed.
4666 */
4667 rtnl_lock();
4668 if (!ipv6_add_dev(init_net.loopback_dev))
4669 err = -ENOMEM;
4670 rtnl_unlock();
4671 if (err)
4672 goto errlo;
4673
4674 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4675 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
4676
4677 register_netdevice_notifier(&ipv6_dev_notf);
4678
4679 addrconf_verify(0);
4680
4681 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4682 if (err < 0)
4683 goto errout;
4684
4685 /* Only the first call to __rtnl_register can fail */
4686 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4687 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4688 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4689 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4690 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4691
4692 ipv6_addr_label_rtnl_register();
4693
4694 return 0;
4695 errout:
4696 unregister_netdevice_notifier(&ipv6_dev_notf);
4697 errlo:
4698 unregister_pernet_subsys(&addrconf_ops);
4699 out_addrlabel:
4700 ipv6_addr_label_cleanup();
4701 out:
4702 return err;
4703 }
4704
4705 void addrconf_cleanup(void)
4706 {
4707 struct net_device *dev;
4708 int i;
4709
4710 unregister_netdevice_notifier(&ipv6_dev_notf);
4711 unregister_pernet_subsys(&addrconf_ops);
4712 ipv6_addr_label_cleanup();
4713
4714 rtnl_lock();
4715
4716 /* clean dev list */
4717 for_each_netdev(&init_net, dev) {
4718 if (__in6_dev_get(dev) == NULL)
4719 continue;
4720 addrconf_ifdown(dev, 1);
4721 }
4722 addrconf_ifdown(init_net.loopback_dev, 2);
4723
4724 /*
4725 * Check hash table.
4726 */
4727 spin_lock_bh(&addrconf_hash_lock);
4728 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4729 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
4730 spin_unlock_bh(&addrconf_hash_lock);
4731
4732 del_timer(&addr_chk_timer);
4733 rtnl_unlock();
4734 }
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