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ipv6: Kill rt6i_dev and rt6i_expires defines.
[deliverable/linux.git] / net / ipv6 / addrconf.c
1 /*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 */
14
15 /*
16 * Changes:
17 *
18 * Janos Farkas : delete timer on ifdown
19 * <chexum@bankinf.banki.hu>
20 * Andi Kleen : kill double kfree on module
21 * unload.
22 * Maciej W. Rozycki : FDDI support
23 * sekiya@USAGI : Don't send too many RS
24 * packets.
25 * yoshfuji@USAGI : Fixed interval between DAD
26 * packets.
27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
28 * address validation timer.
29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
30 * support.
31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
32 * address on a same interface.
33 * YOSHIFUJI Hideaki @USAGI : ARCnet support
34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
35 * seq_file.
36 * YOSHIFUJI Hideaki @USAGI : improved source address
37 * selection; consider scope,
38 * status etc.
39 */
40
41 #include <linux/errno.h>
42 #include <linux/types.h>
43 #include <linux/kernel.h>
44 #include <linux/socket.h>
45 #include <linux/sockios.h>
46 #include <linux/net.h>
47 #include <linux/in6.h>
48 #include <linux/netdevice.h>
49 #include <linux/if_addr.h>
50 #include <linux/if_arp.h>
51 #include <linux/if_arcnet.h>
52 #include <linux/if_infiniband.h>
53 #include <linux/route.h>
54 #include <linux/inetdevice.h>
55 #include <linux/init.h>
56 #include <linux/slab.h>
57 #ifdef CONFIG_SYSCTL
58 #include <linux/sysctl.h>
59 #endif
60 #include <linux/capability.h>
61 #include <linux/delay.h>
62 #include <linux/notifier.h>
63 #include <linux/string.h>
64
65 #include <net/net_namespace.h>
66 #include <net/sock.h>
67 #include <net/snmp.h>
68
69 #include <net/ipv6.h>
70 #include <net/protocol.h>
71 #include <net/ndisc.h>
72 #include <net/ip6_route.h>
73 #include <net/addrconf.h>
74 #include <net/tcp.h>
75 #include <net/ip.h>
76 #include <net/netlink.h>
77 #include <net/pkt_sched.h>
78 #include <linux/if_tunnel.h>
79 #include <linux/rtnetlink.h>
80
81 #ifdef CONFIG_IPV6_PRIVACY
82 #include <linux/random.h>
83 #endif
84
85 #include <linux/uaccess.h>
86 #include <asm/unaligned.h>
87
88 #include <linux/proc_fs.h>
89 #include <linux/seq_file.h>
90 #include <linux/export.h>
91
92 /* Set to 3 to get tracing... */
93 #define ACONF_DEBUG 2
94
95 #if ACONF_DEBUG >= 3
96 #define ADBG(x) printk x
97 #else
98 #define ADBG(x)
99 #endif
100
101 #define INFINITY_LIFE_TIME 0xFFFFFFFF
102
103 static inline u32 cstamp_delta(unsigned long cstamp)
104 {
105 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
106 }
107
108 #define ADDRCONF_TIMER_FUZZ_MINUS (HZ > 50 ? HZ/50 : 1)
109 #define ADDRCONF_TIMER_FUZZ (HZ / 4)
110 #define ADDRCONF_TIMER_FUZZ_MAX (HZ)
111
112 #ifdef CONFIG_SYSCTL
113 static void addrconf_sysctl_register(struct inet6_dev *idev);
114 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
115 #else
116 static inline void addrconf_sysctl_register(struct inet6_dev *idev)
117 {
118 }
119
120 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
121 {
122 }
123 #endif
124
125 #ifdef CONFIG_IPV6_PRIVACY
126 static int __ipv6_regen_rndid(struct inet6_dev *idev);
127 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
128 static void ipv6_regen_rndid(unsigned long data);
129 #endif
130
131 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
132 static int ipv6_count_addresses(struct inet6_dev *idev);
133
134 /*
135 * Configured unicast address hash table
136 */
137 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
138 static DEFINE_SPINLOCK(addrconf_hash_lock);
139
140 static void addrconf_verify(unsigned long);
141
142 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
143 static DEFINE_SPINLOCK(addrconf_verify_lock);
144
145 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
146 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
147
148 static void addrconf_type_change(struct net_device *dev,
149 unsigned long event);
150 static int addrconf_ifdown(struct net_device *dev, int how);
151
152 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
153 static void addrconf_dad_timer(unsigned long data);
154 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
155 static void addrconf_dad_run(struct inet6_dev *idev);
156 static void addrconf_rs_timer(unsigned long data);
157 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
158 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
159
160 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
161 struct prefix_info *pinfo);
162 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
163 struct net_device *dev);
164
165 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
166
167 static struct ipv6_devconf ipv6_devconf __read_mostly = {
168 .forwarding = 0,
169 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
170 .mtu6 = IPV6_MIN_MTU,
171 .accept_ra = 1,
172 .accept_redirects = 1,
173 .autoconf = 1,
174 .force_mld_version = 0,
175 .dad_transmits = 1,
176 .rtr_solicits = MAX_RTR_SOLICITATIONS,
177 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
178 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
179 #ifdef CONFIG_IPV6_PRIVACY
180 .use_tempaddr = 0,
181 .temp_valid_lft = TEMP_VALID_LIFETIME,
182 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
183 .regen_max_retry = REGEN_MAX_RETRY,
184 .max_desync_factor = MAX_DESYNC_FACTOR,
185 #endif
186 .max_addresses = IPV6_MAX_ADDRESSES,
187 .accept_ra_defrtr = 1,
188 .accept_ra_pinfo = 1,
189 #ifdef CONFIG_IPV6_ROUTER_PREF
190 .accept_ra_rtr_pref = 1,
191 .rtr_probe_interval = 60 * HZ,
192 #ifdef CONFIG_IPV6_ROUTE_INFO
193 .accept_ra_rt_info_max_plen = 0,
194 #endif
195 #endif
196 .proxy_ndp = 0,
197 .accept_source_route = 0, /* we do not accept RH0 by default. */
198 .disable_ipv6 = 0,
199 .accept_dad = 1,
200 };
201
202 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
203 .forwarding = 0,
204 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
205 .mtu6 = IPV6_MIN_MTU,
206 .accept_ra = 1,
207 .accept_redirects = 1,
208 .autoconf = 1,
209 .dad_transmits = 1,
210 .rtr_solicits = MAX_RTR_SOLICITATIONS,
211 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
212 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
213 #ifdef CONFIG_IPV6_PRIVACY
214 .use_tempaddr = 0,
215 .temp_valid_lft = TEMP_VALID_LIFETIME,
216 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
217 .regen_max_retry = REGEN_MAX_RETRY,
218 .max_desync_factor = MAX_DESYNC_FACTOR,
219 #endif
220 .max_addresses = IPV6_MAX_ADDRESSES,
221 .accept_ra_defrtr = 1,
222 .accept_ra_pinfo = 1,
223 #ifdef CONFIG_IPV6_ROUTER_PREF
224 .accept_ra_rtr_pref = 1,
225 .rtr_probe_interval = 60 * HZ,
226 #ifdef CONFIG_IPV6_ROUTE_INFO
227 .accept_ra_rt_info_max_plen = 0,
228 #endif
229 #endif
230 .proxy_ndp = 0,
231 .accept_source_route = 0, /* we do not accept RH0 by default. */
232 .disable_ipv6 = 0,
233 .accept_dad = 1,
234 };
235
236 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
237 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
238 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
239 const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
240 const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
241
242 /* Check if a valid qdisc is available */
243 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
244 {
245 return !qdisc_tx_is_noop(dev);
246 }
247
248 /* Check if a route is valid prefix route */
249 static inline int addrconf_is_prefix_route(const struct rt6_info *rt)
250 {
251 return (rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0;
252 }
253
254 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
255 {
256 if (del_timer(&ifp->timer))
257 __in6_ifa_put(ifp);
258 }
259
260 enum addrconf_timer_t {
261 AC_NONE,
262 AC_DAD,
263 AC_RS,
264 };
265
266 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
267 enum addrconf_timer_t what,
268 unsigned long when)
269 {
270 if (!del_timer(&ifp->timer))
271 in6_ifa_hold(ifp);
272
273 switch (what) {
274 case AC_DAD:
275 ifp->timer.function = addrconf_dad_timer;
276 break;
277 case AC_RS:
278 ifp->timer.function = addrconf_rs_timer;
279 break;
280 default:
281 break;
282 }
283 ifp->timer.expires = jiffies + when;
284 add_timer(&ifp->timer);
285 }
286
287 static int snmp6_alloc_dev(struct inet6_dev *idev)
288 {
289 if (snmp_mib_init((void __percpu **)idev->stats.ipv6,
290 sizeof(struct ipstats_mib),
291 __alignof__(struct ipstats_mib)) < 0)
292 goto err_ip;
293 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
294 GFP_KERNEL);
295 if (!idev->stats.icmpv6dev)
296 goto err_icmp;
297 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
298 GFP_KERNEL);
299 if (!idev->stats.icmpv6msgdev)
300 goto err_icmpmsg;
301
302 return 0;
303
304 err_icmpmsg:
305 kfree(idev->stats.icmpv6dev);
306 err_icmp:
307 snmp_mib_free((void __percpu **)idev->stats.ipv6);
308 err_ip:
309 return -ENOMEM;
310 }
311
312 static void snmp6_free_dev(struct inet6_dev *idev)
313 {
314 kfree(idev->stats.icmpv6msgdev);
315 kfree(idev->stats.icmpv6dev);
316 snmp_mib_free((void __percpu **)idev->stats.ipv6);
317 }
318
319 /* Nobody refers to this device, we may destroy it. */
320
321 void in6_dev_finish_destroy(struct inet6_dev *idev)
322 {
323 struct net_device *dev = idev->dev;
324
325 WARN_ON(!list_empty(&idev->addr_list));
326 WARN_ON(idev->mc_list != NULL);
327
328 #ifdef NET_REFCNT_DEBUG
329 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
330 #endif
331 dev_put(dev);
332 if (!idev->dead) {
333 pr_warning("Freeing alive inet6 device %p\n", idev);
334 return;
335 }
336 snmp6_free_dev(idev);
337 kfree_rcu(idev, rcu);
338 }
339
340 EXPORT_SYMBOL(in6_dev_finish_destroy);
341
342 static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
343 {
344 struct inet6_dev *ndev;
345
346 ASSERT_RTNL();
347
348 if (dev->mtu < IPV6_MIN_MTU)
349 return NULL;
350
351 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
352
353 if (ndev == NULL)
354 return NULL;
355
356 rwlock_init(&ndev->lock);
357 ndev->dev = dev;
358 INIT_LIST_HEAD(&ndev->addr_list);
359
360 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
361 ndev->cnf.mtu6 = dev->mtu;
362 ndev->cnf.sysctl = NULL;
363 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
364 if (ndev->nd_parms == NULL) {
365 kfree(ndev);
366 return NULL;
367 }
368 if (ndev->cnf.forwarding)
369 dev_disable_lro(dev);
370 /* We refer to the device */
371 dev_hold(dev);
372
373 if (snmp6_alloc_dev(ndev) < 0) {
374 ADBG((KERN_WARNING
375 "%s(): cannot allocate memory for statistics; dev=%s.\n",
376 __func__, dev->name));
377 neigh_parms_release(&nd_tbl, ndev->nd_parms);
378 dev_put(dev);
379 kfree(ndev);
380 return NULL;
381 }
382
383 if (snmp6_register_dev(ndev) < 0) {
384 ADBG((KERN_WARNING
385 "%s(): cannot create /proc/net/dev_snmp6/%s\n",
386 __func__, dev->name));
387 neigh_parms_release(&nd_tbl, ndev->nd_parms);
388 ndev->dead = 1;
389 in6_dev_finish_destroy(ndev);
390 return NULL;
391 }
392
393 /* One reference from device. We must do this before
394 * we invoke __ipv6_regen_rndid().
395 */
396 in6_dev_hold(ndev);
397
398 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
399 ndev->cnf.accept_dad = -1;
400
401 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
402 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
403 printk(KERN_INFO
404 "%s: Disabled Multicast RS\n",
405 dev->name);
406 ndev->cnf.rtr_solicits = 0;
407 }
408 #endif
409
410 #ifdef CONFIG_IPV6_PRIVACY
411 INIT_LIST_HEAD(&ndev->tempaddr_list);
412 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
413 if ((dev->flags&IFF_LOOPBACK) ||
414 dev->type == ARPHRD_TUNNEL ||
415 dev->type == ARPHRD_TUNNEL6 ||
416 dev->type == ARPHRD_SIT ||
417 dev->type == ARPHRD_NONE) {
418 ndev->cnf.use_tempaddr = -1;
419 } else {
420 in6_dev_hold(ndev);
421 ipv6_regen_rndid((unsigned long) ndev);
422 }
423 #endif
424
425 if (netif_running(dev) && addrconf_qdisc_ok(dev))
426 ndev->if_flags |= IF_READY;
427
428 ipv6_mc_init_dev(ndev);
429 ndev->tstamp = jiffies;
430 addrconf_sysctl_register(ndev);
431 /* protected by rtnl_lock */
432 RCU_INIT_POINTER(dev->ip6_ptr, ndev);
433
434 /* Join all-node multicast group */
435 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
436
437 return ndev;
438 }
439
440 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
441 {
442 struct inet6_dev *idev;
443
444 ASSERT_RTNL();
445
446 idev = __in6_dev_get(dev);
447 if (!idev) {
448 idev = ipv6_add_dev(dev);
449 if (!idev)
450 return NULL;
451 }
452
453 if (dev->flags&IFF_UP)
454 ipv6_mc_up(idev);
455 return idev;
456 }
457
458 #ifdef CONFIG_SYSCTL
459 static void dev_forward_change(struct inet6_dev *idev)
460 {
461 struct net_device *dev;
462 struct inet6_ifaddr *ifa;
463
464 if (!idev)
465 return;
466 dev = idev->dev;
467 if (idev->cnf.forwarding)
468 dev_disable_lro(dev);
469 if (dev && (dev->flags & IFF_MULTICAST)) {
470 if (idev->cnf.forwarding)
471 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
472 else
473 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
474 }
475
476 list_for_each_entry(ifa, &idev->addr_list, if_list) {
477 if (ifa->flags&IFA_F_TENTATIVE)
478 continue;
479 if (idev->cnf.forwarding)
480 addrconf_join_anycast(ifa);
481 else
482 addrconf_leave_anycast(ifa);
483 }
484 }
485
486
487 static void addrconf_forward_change(struct net *net, __s32 newf)
488 {
489 struct net_device *dev;
490 struct inet6_dev *idev;
491
492 rcu_read_lock();
493 for_each_netdev_rcu(net, dev) {
494 idev = __in6_dev_get(dev);
495 if (idev) {
496 int changed = (!idev->cnf.forwarding) ^ (!newf);
497 idev->cnf.forwarding = newf;
498 if (changed)
499 dev_forward_change(idev);
500 }
501 }
502 rcu_read_unlock();
503 }
504
505 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old)
506 {
507 struct net *net;
508
509 net = (struct net *)table->extra2;
510 if (p == &net->ipv6.devconf_dflt->forwarding)
511 return 0;
512
513 if (!rtnl_trylock()) {
514 /* Restore the original values before restarting */
515 *p = old;
516 return restart_syscall();
517 }
518
519 if (p == &net->ipv6.devconf_all->forwarding) {
520 __s32 newf = net->ipv6.devconf_all->forwarding;
521 net->ipv6.devconf_dflt->forwarding = newf;
522 addrconf_forward_change(net, newf);
523 } else if ((!*p) ^ (!old))
524 dev_forward_change((struct inet6_dev *)table->extra1);
525 rtnl_unlock();
526
527 if (*p)
528 rt6_purge_dflt_routers(net);
529 return 1;
530 }
531 #endif
532
533 /* Nobody refers to this ifaddr, destroy it */
534 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
535 {
536 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
537
538 #ifdef NET_REFCNT_DEBUG
539 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
540 #endif
541
542 in6_dev_put(ifp->idev);
543
544 if (del_timer(&ifp->timer))
545 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp);
546
547 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
548 pr_warning("Freeing alive inet6 address %p\n", ifp);
549 return;
550 }
551 dst_release(&ifp->rt->dst);
552
553 kfree_rcu(ifp, rcu);
554 }
555
556 static void
557 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
558 {
559 struct list_head *p;
560 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
561
562 /*
563 * Each device address list is sorted in order of scope -
564 * global before linklocal.
565 */
566 list_for_each(p, &idev->addr_list) {
567 struct inet6_ifaddr *ifa
568 = list_entry(p, struct inet6_ifaddr, if_list);
569 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
570 break;
571 }
572
573 list_add_tail(&ifp->if_list, p);
574 }
575
576 static u32 ipv6_addr_hash(const struct in6_addr *addr)
577 {
578 /*
579 * We perform the hash function over the last 64 bits of the address
580 * This will include the IEEE address token on links that support it.
581 */
582 return jhash_2words((__force u32)addr->s6_addr32[2],
583 (__force u32)addr->s6_addr32[3], 0)
584 & (IN6_ADDR_HSIZE - 1);
585 }
586
587 /* On success it returns ifp with increased reference count */
588
589 static struct inet6_ifaddr *
590 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
591 int scope, u32 flags)
592 {
593 struct inet6_ifaddr *ifa = NULL;
594 struct rt6_info *rt;
595 unsigned int hash;
596 int err = 0;
597 int addr_type = ipv6_addr_type(addr);
598
599 if (addr_type == IPV6_ADDR_ANY ||
600 addr_type & IPV6_ADDR_MULTICAST ||
601 (!(idev->dev->flags & IFF_LOOPBACK) &&
602 addr_type & IPV6_ADDR_LOOPBACK))
603 return ERR_PTR(-EADDRNOTAVAIL);
604
605 rcu_read_lock_bh();
606 if (idev->dead) {
607 err = -ENODEV; /*XXX*/
608 goto out2;
609 }
610
611 if (idev->cnf.disable_ipv6) {
612 err = -EACCES;
613 goto out2;
614 }
615
616 spin_lock(&addrconf_hash_lock);
617
618 /* Ignore adding duplicate addresses on an interface */
619 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
620 ADBG(("ipv6_add_addr: already assigned\n"));
621 err = -EEXIST;
622 goto out;
623 }
624
625 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
626
627 if (ifa == NULL) {
628 ADBG(("ipv6_add_addr: malloc failed\n"));
629 err = -ENOBUFS;
630 goto out;
631 }
632
633 rt = addrconf_dst_alloc(idev, addr, false);
634 if (IS_ERR(rt)) {
635 err = PTR_ERR(rt);
636 goto out;
637 }
638
639 ifa->addr = *addr;
640
641 spin_lock_init(&ifa->lock);
642 spin_lock_init(&ifa->state_lock);
643 init_timer(&ifa->timer);
644 INIT_HLIST_NODE(&ifa->addr_lst);
645 ifa->timer.data = (unsigned long) ifa;
646 ifa->scope = scope;
647 ifa->prefix_len = pfxlen;
648 ifa->flags = flags | IFA_F_TENTATIVE;
649 ifa->cstamp = ifa->tstamp = jiffies;
650
651 ifa->rt = rt;
652
653 ifa->idev = idev;
654 in6_dev_hold(idev);
655 /* For caller */
656 in6_ifa_hold(ifa);
657
658 /* Add to big hash table */
659 hash = ipv6_addr_hash(addr);
660
661 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
662 spin_unlock(&addrconf_hash_lock);
663
664 write_lock(&idev->lock);
665 /* Add to inet6_dev unicast addr list. */
666 ipv6_link_dev_addr(idev, ifa);
667
668 #ifdef CONFIG_IPV6_PRIVACY
669 if (ifa->flags&IFA_F_TEMPORARY) {
670 list_add(&ifa->tmp_list, &idev->tempaddr_list);
671 in6_ifa_hold(ifa);
672 }
673 #endif
674
675 in6_ifa_hold(ifa);
676 write_unlock(&idev->lock);
677 out2:
678 rcu_read_unlock_bh();
679
680 if (likely(err == 0))
681 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
682 else {
683 kfree(ifa);
684 ifa = ERR_PTR(err);
685 }
686
687 return ifa;
688 out:
689 spin_unlock(&addrconf_hash_lock);
690 goto out2;
691 }
692
693 /* This function wants to get referenced ifp and releases it before return */
694
695 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
696 {
697 struct inet6_ifaddr *ifa, *ifn;
698 struct inet6_dev *idev = ifp->idev;
699 int state;
700 int deleted = 0, onlink = 0;
701 unsigned long expires = jiffies;
702
703 spin_lock_bh(&ifp->state_lock);
704 state = ifp->state;
705 ifp->state = INET6_IFADDR_STATE_DEAD;
706 spin_unlock_bh(&ifp->state_lock);
707
708 if (state == INET6_IFADDR_STATE_DEAD)
709 goto out;
710
711 spin_lock_bh(&addrconf_hash_lock);
712 hlist_del_init_rcu(&ifp->addr_lst);
713 spin_unlock_bh(&addrconf_hash_lock);
714
715 write_lock_bh(&idev->lock);
716 #ifdef CONFIG_IPV6_PRIVACY
717 if (ifp->flags&IFA_F_TEMPORARY) {
718 list_del(&ifp->tmp_list);
719 if (ifp->ifpub) {
720 in6_ifa_put(ifp->ifpub);
721 ifp->ifpub = NULL;
722 }
723 __in6_ifa_put(ifp);
724 }
725 #endif
726
727 list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) {
728 if (ifa == ifp) {
729 list_del_init(&ifp->if_list);
730 __in6_ifa_put(ifp);
731
732 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
733 break;
734 deleted = 1;
735 continue;
736 } else if (ifp->flags & IFA_F_PERMANENT) {
737 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
738 ifp->prefix_len)) {
739 if (ifa->flags & IFA_F_PERMANENT) {
740 onlink = 1;
741 if (deleted)
742 break;
743 } else {
744 unsigned long lifetime;
745
746 if (!onlink)
747 onlink = -1;
748
749 spin_lock(&ifa->lock);
750
751 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
752 /*
753 * Note: Because this address is
754 * not permanent, lifetime <
755 * LONG_MAX / HZ here.
756 */
757 if (time_before(expires,
758 ifa->tstamp + lifetime * HZ))
759 expires = ifa->tstamp + lifetime * HZ;
760 spin_unlock(&ifa->lock);
761 }
762 }
763 }
764 }
765 write_unlock_bh(&idev->lock);
766
767 addrconf_del_timer(ifp);
768
769 ipv6_ifa_notify(RTM_DELADDR, ifp);
770
771 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
772
773 /*
774 * Purge or update corresponding prefix
775 *
776 * 1) we don't purge prefix here if address was not permanent.
777 * prefix is managed by its own lifetime.
778 * 2) if there're no addresses, delete prefix.
779 * 3) if there're still other permanent address(es),
780 * corresponding prefix is still permanent.
781 * 4) otherwise, update prefix lifetime to the
782 * longest valid lifetime among the corresponding
783 * addresses on the device.
784 * Note: subsequent RA will update lifetime.
785 *
786 * --yoshfuji
787 */
788 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
789 struct in6_addr prefix;
790 struct rt6_info *rt;
791 struct net *net = dev_net(ifp->idev->dev);
792 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
793 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1);
794
795 if (rt && addrconf_is_prefix_route(rt)) {
796 if (onlink == 0) {
797 ip6_del_rt(rt);
798 rt = NULL;
799 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
800 rt->dst.expires = expires;
801 rt->rt6i_flags |= RTF_EXPIRES;
802 }
803 }
804 dst_release(&rt->dst);
805 }
806
807 /* clean up prefsrc entries */
808 rt6_remove_prefsrc(ifp);
809 out:
810 in6_ifa_put(ifp);
811 }
812
813 #ifdef CONFIG_IPV6_PRIVACY
814 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
815 {
816 struct inet6_dev *idev = ifp->idev;
817 struct in6_addr addr, *tmpaddr;
818 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
819 unsigned long regen_advance;
820 int tmp_plen;
821 int ret = 0;
822 int max_addresses;
823 u32 addr_flags;
824 unsigned long now = jiffies;
825
826 write_lock(&idev->lock);
827 if (ift) {
828 spin_lock_bh(&ift->lock);
829 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
830 spin_unlock_bh(&ift->lock);
831 tmpaddr = &addr;
832 } else {
833 tmpaddr = NULL;
834 }
835 retry:
836 in6_dev_hold(idev);
837 if (idev->cnf.use_tempaddr <= 0) {
838 write_unlock(&idev->lock);
839 printk(KERN_INFO
840 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
841 in6_dev_put(idev);
842 ret = -1;
843 goto out;
844 }
845 spin_lock_bh(&ifp->lock);
846 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
847 idev->cnf.use_tempaddr = -1; /*XXX*/
848 spin_unlock_bh(&ifp->lock);
849 write_unlock(&idev->lock);
850 printk(KERN_WARNING
851 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
852 in6_dev_put(idev);
853 ret = -1;
854 goto out;
855 }
856 in6_ifa_hold(ifp);
857 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
858 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
859 spin_unlock_bh(&ifp->lock);
860 write_unlock(&idev->lock);
861 printk(KERN_WARNING
862 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
863 in6_ifa_put(ifp);
864 in6_dev_put(idev);
865 ret = -1;
866 goto out;
867 }
868 memcpy(&addr.s6_addr[8], idev->rndid, 8);
869 age = (now - ifp->tstamp) / HZ;
870 tmp_valid_lft = min_t(__u32,
871 ifp->valid_lft,
872 idev->cnf.temp_valid_lft + age);
873 tmp_prefered_lft = min_t(__u32,
874 ifp->prefered_lft,
875 idev->cnf.temp_prefered_lft + age -
876 idev->cnf.max_desync_factor);
877 tmp_plen = ifp->prefix_len;
878 max_addresses = idev->cnf.max_addresses;
879 tmp_tstamp = ifp->tstamp;
880 spin_unlock_bh(&ifp->lock);
881
882 regen_advance = idev->cnf.regen_max_retry *
883 idev->cnf.dad_transmits *
884 idev->nd_parms->retrans_time / HZ;
885 write_unlock(&idev->lock);
886
887 /* A temporary address is created only if this calculated Preferred
888 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
889 * an implementation must not create a temporary address with a zero
890 * Preferred Lifetime.
891 */
892 if (tmp_prefered_lft <= regen_advance) {
893 in6_ifa_put(ifp);
894 in6_dev_put(idev);
895 ret = -1;
896 goto out;
897 }
898
899 addr_flags = IFA_F_TEMPORARY;
900 /* set in addrconf_prefix_rcv() */
901 if (ifp->flags & IFA_F_OPTIMISTIC)
902 addr_flags |= IFA_F_OPTIMISTIC;
903
904 ift = !max_addresses ||
905 ipv6_count_addresses(idev) < max_addresses ?
906 ipv6_add_addr(idev, &addr, tmp_plen,
907 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
908 addr_flags) : NULL;
909 if (!ift || IS_ERR(ift)) {
910 in6_ifa_put(ifp);
911 in6_dev_put(idev);
912 printk(KERN_INFO
913 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
914 tmpaddr = &addr;
915 write_lock(&idev->lock);
916 goto retry;
917 }
918
919 spin_lock_bh(&ift->lock);
920 ift->ifpub = ifp;
921 ift->valid_lft = tmp_valid_lft;
922 ift->prefered_lft = tmp_prefered_lft;
923 ift->cstamp = now;
924 ift->tstamp = tmp_tstamp;
925 spin_unlock_bh(&ift->lock);
926
927 addrconf_dad_start(ift, 0);
928 in6_ifa_put(ift);
929 in6_dev_put(idev);
930 out:
931 return ret;
932 }
933 #endif
934
935 /*
936 * Choose an appropriate source address (RFC3484)
937 */
938 enum {
939 IPV6_SADDR_RULE_INIT = 0,
940 IPV6_SADDR_RULE_LOCAL,
941 IPV6_SADDR_RULE_SCOPE,
942 IPV6_SADDR_RULE_PREFERRED,
943 #ifdef CONFIG_IPV6_MIP6
944 IPV6_SADDR_RULE_HOA,
945 #endif
946 IPV6_SADDR_RULE_OIF,
947 IPV6_SADDR_RULE_LABEL,
948 #ifdef CONFIG_IPV6_PRIVACY
949 IPV6_SADDR_RULE_PRIVACY,
950 #endif
951 IPV6_SADDR_RULE_ORCHID,
952 IPV6_SADDR_RULE_PREFIX,
953 IPV6_SADDR_RULE_MAX
954 };
955
956 struct ipv6_saddr_score {
957 int rule;
958 int addr_type;
959 struct inet6_ifaddr *ifa;
960 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
961 int scopedist;
962 int matchlen;
963 };
964
965 struct ipv6_saddr_dst {
966 const struct in6_addr *addr;
967 int ifindex;
968 int scope;
969 int label;
970 unsigned int prefs;
971 };
972
973 static inline int ipv6_saddr_preferred(int type)
974 {
975 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
976 return 1;
977 return 0;
978 }
979
980 static int ipv6_get_saddr_eval(struct net *net,
981 struct ipv6_saddr_score *score,
982 struct ipv6_saddr_dst *dst,
983 int i)
984 {
985 int ret;
986
987 if (i <= score->rule) {
988 switch (i) {
989 case IPV6_SADDR_RULE_SCOPE:
990 ret = score->scopedist;
991 break;
992 case IPV6_SADDR_RULE_PREFIX:
993 ret = score->matchlen;
994 break;
995 default:
996 ret = !!test_bit(i, score->scorebits);
997 }
998 goto out;
999 }
1000
1001 switch (i) {
1002 case IPV6_SADDR_RULE_INIT:
1003 /* Rule 0: remember if hiscore is not ready yet */
1004 ret = !!score->ifa;
1005 break;
1006 case IPV6_SADDR_RULE_LOCAL:
1007 /* Rule 1: Prefer same address */
1008 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1009 break;
1010 case IPV6_SADDR_RULE_SCOPE:
1011 /* Rule 2: Prefer appropriate scope
1012 *
1013 * ret
1014 * ^
1015 * -1 | d 15
1016 * ---+--+-+---> scope
1017 * |
1018 * | d is scope of the destination.
1019 * B-d | \
1020 * | \ <- smaller scope is better if
1021 * B-15 | \ if scope is enough for destinaion.
1022 * | ret = B - scope (-1 <= scope >= d <= 15).
1023 * d-C-1 | /
1024 * |/ <- greater is better
1025 * -C / if scope is not enough for destination.
1026 * /| ret = scope - C (-1 <= d < scope <= 15).
1027 *
1028 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1029 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1030 * Assume B = 0 and we get C > 29.
1031 */
1032 ret = __ipv6_addr_src_scope(score->addr_type);
1033 if (ret >= dst->scope)
1034 ret = -ret;
1035 else
1036 ret -= 128; /* 30 is enough */
1037 score->scopedist = ret;
1038 break;
1039 case IPV6_SADDR_RULE_PREFERRED:
1040 /* Rule 3: Avoid deprecated and optimistic addresses */
1041 ret = ipv6_saddr_preferred(score->addr_type) ||
1042 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1043 break;
1044 #ifdef CONFIG_IPV6_MIP6
1045 case IPV6_SADDR_RULE_HOA:
1046 {
1047 /* Rule 4: Prefer home address */
1048 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1049 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1050 break;
1051 }
1052 #endif
1053 case IPV6_SADDR_RULE_OIF:
1054 /* Rule 5: Prefer outgoing interface */
1055 ret = (!dst->ifindex ||
1056 dst->ifindex == score->ifa->idev->dev->ifindex);
1057 break;
1058 case IPV6_SADDR_RULE_LABEL:
1059 /* Rule 6: Prefer matching label */
1060 ret = ipv6_addr_label(net,
1061 &score->ifa->addr, score->addr_type,
1062 score->ifa->idev->dev->ifindex) == dst->label;
1063 break;
1064 #ifdef CONFIG_IPV6_PRIVACY
1065 case IPV6_SADDR_RULE_PRIVACY:
1066 {
1067 /* Rule 7: Prefer public address
1068 * Note: prefer temporary address if use_tempaddr >= 2
1069 */
1070 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1071 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1072 score->ifa->idev->cnf.use_tempaddr >= 2;
1073 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1074 break;
1075 }
1076 #endif
1077 case IPV6_SADDR_RULE_ORCHID:
1078 /* Rule 8-: Prefer ORCHID vs ORCHID or
1079 * non-ORCHID vs non-ORCHID
1080 */
1081 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1082 ipv6_addr_orchid(dst->addr));
1083 break;
1084 case IPV6_SADDR_RULE_PREFIX:
1085 /* Rule 8: Use longest matching prefix */
1086 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr,
1087 dst->addr);
1088 break;
1089 default:
1090 ret = 0;
1091 }
1092
1093 if (ret)
1094 __set_bit(i, score->scorebits);
1095 score->rule = i;
1096 out:
1097 return ret;
1098 }
1099
1100 int ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev,
1101 const struct in6_addr *daddr, unsigned int prefs,
1102 struct in6_addr *saddr)
1103 {
1104 struct ipv6_saddr_score scores[2],
1105 *score = &scores[0], *hiscore = &scores[1];
1106 struct ipv6_saddr_dst dst;
1107 struct net_device *dev;
1108 int dst_type;
1109
1110 dst_type = __ipv6_addr_type(daddr);
1111 dst.addr = daddr;
1112 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1113 dst.scope = __ipv6_addr_src_scope(dst_type);
1114 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1115 dst.prefs = prefs;
1116
1117 hiscore->rule = -1;
1118 hiscore->ifa = NULL;
1119
1120 rcu_read_lock();
1121
1122 for_each_netdev_rcu(net, dev) {
1123 struct inet6_dev *idev;
1124
1125 /* Candidate Source Address (section 4)
1126 * - multicast and link-local destination address,
1127 * the set of candidate source address MUST only
1128 * include addresses assigned to interfaces
1129 * belonging to the same link as the outgoing
1130 * interface.
1131 * (- For site-local destination addresses, the
1132 * set of candidate source addresses MUST only
1133 * include addresses assigned to interfaces
1134 * belonging to the same site as the outgoing
1135 * interface.)
1136 */
1137 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1138 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1139 dst.ifindex && dev->ifindex != dst.ifindex)
1140 continue;
1141
1142 idev = __in6_dev_get(dev);
1143 if (!idev)
1144 continue;
1145
1146 read_lock_bh(&idev->lock);
1147 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1148 int i;
1149
1150 /*
1151 * - Tentative Address (RFC2462 section 5.4)
1152 * - A tentative address is not considered
1153 * "assigned to an interface" in the traditional
1154 * sense, unless it is also flagged as optimistic.
1155 * - Candidate Source Address (section 4)
1156 * - In any case, anycast addresses, multicast
1157 * addresses, and the unspecified address MUST
1158 * NOT be included in a candidate set.
1159 */
1160 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1161 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1162 continue;
1163
1164 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1165
1166 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1167 score->addr_type & IPV6_ADDR_MULTICAST)) {
1168 LIMIT_NETDEBUG(KERN_DEBUG
1169 "ADDRCONF: unspecified / multicast address "
1170 "assigned as unicast address on %s",
1171 dev->name);
1172 continue;
1173 }
1174
1175 score->rule = -1;
1176 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1177
1178 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1179 int minihiscore, miniscore;
1180
1181 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1182 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1183
1184 if (minihiscore > miniscore) {
1185 if (i == IPV6_SADDR_RULE_SCOPE &&
1186 score->scopedist > 0) {
1187 /*
1188 * special case:
1189 * each remaining entry
1190 * has too small (not enough)
1191 * scope, because ifa entries
1192 * are sorted by their scope
1193 * values.
1194 */
1195 goto try_nextdev;
1196 }
1197 break;
1198 } else if (minihiscore < miniscore) {
1199 if (hiscore->ifa)
1200 in6_ifa_put(hiscore->ifa);
1201
1202 in6_ifa_hold(score->ifa);
1203
1204 swap(hiscore, score);
1205
1206 /* restore our iterator */
1207 score->ifa = hiscore->ifa;
1208
1209 break;
1210 }
1211 }
1212 }
1213 try_nextdev:
1214 read_unlock_bh(&idev->lock);
1215 }
1216 rcu_read_unlock();
1217
1218 if (!hiscore->ifa)
1219 return -EADDRNOTAVAIL;
1220
1221 *saddr = hiscore->ifa->addr;
1222 in6_ifa_put(hiscore->ifa);
1223 return 0;
1224 }
1225 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1226
1227 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1228 unsigned char banned_flags)
1229 {
1230 struct inet6_dev *idev;
1231 int err = -EADDRNOTAVAIL;
1232
1233 rcu_read_lock();
1234 idev = __in6_dev_get(dev);
1235 if (idev) {
1236 struct inet6_ifaddr *ifp;
1237
1238 read_lock_bh(&idev->lock);
1239 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1240 if (ifp->scope == IFA_LINK &&
1241 !(ifp->flags & banned_flags)) {
1242 *addr = ifp->addr;
1243 err = 0;
1244 break;
1245 }
1246 }
1247 read_unlock_bh(&idev->lock);
1248 }
1249 rcu_read_unlock();
1250 return err;
1251 }
1252
1253 static int ipv6_count_addresses(struct inet6_dev *idev)
1254 {
1255 int cnt = 0;
1256 struct inet6_ifaddr *ifp;
1257
1258 read_lock_bh(&idev->lock);
1259 list_for_each_entry(ifp, &idev->addr_list, if_list)
1260 cnt++;
1261 read_unlock_bh(&idev->lock);
1262 return cnt;
1263 }
1264
1265 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1266 struct net_device *dev, int strict)
1267 {
1268 struct inet6_ifaddr *ifp;
1269 struct hlist_node *node;
1270 unsigned int hash = ipv6_addr_hash(addr);
1271
1272 rcu_read_lock_bh();
1273 hlist_for_each_entry_rcu(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1274 if (!net_eq(dev_net(ifp->idev->dev), net))
1275 continue;
1276 if (ipv6_addr_equal(&ifp->addr, addr) &&
1277 !(ifp->flags&IFA_F_TENTATIVE) &&
1278 (dev == NULL || ifp->idev->dev == dev ||
1279 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1280 rcu_read_unlock_bh();
1281 return 1;
1282 }
1283 }
1284
1285 rcu_read_unlock_bh();
1286 return 0;
1287 }
1288 EXPORT_SYMBOL(ipv6_chk_addr);
1289
1290 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1291 struct net_device *dev)
1292 {
1293 unsigned int hash = ipv6_addr_hash(addr);
1294 struct inet6_ifaddr *ifp;
1295 struct hlist_node *node;
1296
1297 hlist_for_each_entry(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1298 if (!net_eq(dev_net(ifp->idev->dev), net))
1299 continue;
1300 if (ipv6_addr_equal(&ifp->addr, addr)) {
1301 if (dev == NULL || ifp->idev->dev == dev)
1302 return true;
1303 }
1304 }
1305 return false;
1306 }
1307
1308 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1309 {
1310 struct inet6_dev *idev;
1311 struct inet6_ifaddr *ifa;
1312 int onlink;
1313
1314 onlink = 0;
1315 rcu_read_lock();
1316 idev = __in6_dev_get(dev);
1317 if (idev) {
1318 read_lock_bh(&idev->lock);
1319 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1320 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1321 ifa->prefix_len);
1322 if (onlink)
1323 break;
1324 }
1325 read_unlock_bh(&idev->lock);
1326 }
1327 rcu_read_unlock();
1328 return onlink;
1329 }
1330
1331 EXPORT_SYMBOL(ipv6_chk_prefix);
1332
1333 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1334 struct net_device *dev, int strict)
1335 {
1336 struct inet6_ifaddr *ifp, *result = NULL;
1337 unsigned int hash = ipv6_addr_hash(addr);
1338 struct hlist_node *node;
1339
1340 rcu_read_lock_bh();
1341 hlist_for_each_entry_rcu_bh(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1342 if (!net_eq(dev_net(ifp->idev->dev), net))
1343 continue;
1344 if (ipv6_addr_equal(&ifp->addr, addr)) {
1345 if (dev == NULL || ifp->idev->dev == dev ||
1346 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1347 result = ifp;
1348 in6_ifa_hold(ifp);
1349 break;
1350 }
1351 }
1352 }
1353 rcu_read_unlock_bh();
1354
1355 return result;
1356 }
1357
1358 /* Gets referenced address, destroys ifaddr */
1359
1360 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1361 {
1362 if (ifp->flags&IFA_F_PERMANENT) {
1363 spin_lock_bh(&ifp->lock);
1364 addrconf_del_timer(ifp);
1365 ifp->flags |= IFA_F_TENTATIVE;
1366 if (dad_failed)
1367 ifp->flags |= IFA_F_DADFAILED;
1368 spin_unlock_bh(&ifp->lock);
1369 if (dad_failed)
1370 ipv6_ifa_notify(0, ifp);
1371 in6_ifa_put(ifp);
1372 #ifdef CONFIG_IPV6_PRIVACY
1373 } else if (ifp->flags&IFA_F_TEMPORARY) {
1374 struct inet6_ifaddr *ifpub;
1375 spin_lock_bh(&ifp->lock);
1376 ifpub = ifp->ifpub;
1377 if (ifpub) {
1378 in6_ifa_hold(ifpub);
1379 spin_unlock_bh(&ifp->lock);
1380 ipv6_create_tempaddr(ifpub, ifp);
1381 in6_ifa_put(ifpub);
1382 } else {
1383 spin_unlock_bh(&ifp->lock);
1384 }
1385 ipv6_del_addr(ifp);
1386 #endif
1387 } else
1388 ipv6_del_addr(ifp);
1389 }
1390
1391 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1392 {
1393 int err = -ENOENT;
1394
1395 spin_lock(&ifp->state_lock);
1396 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1397 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1398 err = 0;
1399 }
1400 spin_unlock(&ifp->state_lock);
1401
1402 return err;
1403 }
1404
1405 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1406 {
1407 struct inet6_dev *idev = ifp->idev;
1408
1409 if (addrconf_dad_end(ifp)) {
1410 in6_ifa_put(ifp);
1411 return;
1412 }
1413
1414 if (net_ratelimit())
1415 printk(KERN_INFO "%s: IPv6 duplicate address %pI6c detected!\n",
1416 ifp->idev->dev->name, &ifp->addr);
1417
1418 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1419 struct in6_addr addr;
1420
1421 addr.s6_addr32[0] = htonl(0xfe800000);
1422 addr.s6_addr32[1] = 0;
1423
1424 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1425 ipv6_addr_equal(&ifp->addr, &addr)) {
1426 /* DAD failed for link-local based on MAC address */
1427 idev->cnf.disable_ipv6 = 1;
1428
1429 printk(KERN_INFO "%s: IPv6 being disabled!\n",
1430 ifp->idev->dev->name);
1431 }
1432 }
1433
1434 addrconf_dad_stop(ifp, 1);
1435 }
1436
1437 /* Join to solicited addr multicast group. */
1438
1439 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1440 {
1441 struct in6_addr maddr;
1442
1443 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1444 return;
1445
1446 addrconf_addr_solict_mult(addr, &maddr);
1447 ipv6_dev_mc_inc(dev, &maddr);
1448 }
1449
1450 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1451 {
1452 struct in6_addr maddr;
1453
1454 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1455 return;
1456
1457 addrconf_addr_solict_mult(addr, &maddr);
1458 __ipv6_dev_mc_dec(idev, &maddr);
1459 }
1460
1461 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1462 {
1463 struct in6_addr addr;
1464 if (ifp->prefix_len == 127) /* RFC 6164 */
1465 return;
1466 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1467 if (ipv6_addr_any(&addr))
1468 return;
1469 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1470 }
1471
1472 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1473 {
1474 struct in6_addr addr;
1475 if (ifp->prefix_len == 127) /* RFC 6164 */
1476 return;
1477 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1478 if (ipv6_addr_any(&addr))
1479 return;
1480 __ipv6_dev_ac_dec(ifp->idev, &addr);
1481 }
1482
1483 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1484 {
1485 if (dev->addr_len != ETH_ALEN)
1486 return -1;
1487 memcpy(eui, dev->dev_addr, 3);
1488 memcpy(eui + 5, dev->dev_addr + 3, 3);
1489
1490 /*
1491 * The zSeries OSA network cards can be shared among various
1492 * OS instances, but the OSA cards have only one MAC address.
1493 * This leads to duplicate address conflicts in conjunction
1494 * with IPv6 if more than one instance uses the same card.
1495 *
1496 * The driver for these cards can deliver a unique 16-bit
1497 * identifier for each instance sharing the same card. It is
1498 * placed instead of 0xFFFE in the interface identifier. The
1499 * "u" bit of the interface identifier is not inverted in this
1500 * case. Hence the resulting interface identifier has local
1501 * scope according to RFC2373.
1502 */
1503 if (dev->dev_id) {
1504 eui[3] = (dev->dev_id >> 8) & 0xFF;
1505 eui[4] = dev->dev_id & 0xFF;
1506 } else {
1507 eui[3] = 0xFF;
1508 eui[4] = 0xFE;
1509 eui[0] ^= 2;
1510 }
1511 return 0;
1512 }
1513
1514 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1515 {
1516 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1517 if (dev->addr_len != ARCNET_ALEN)
1518 return -1;
1519 memset(eui, 0, 7);
1520 eui[7] = *(u8*)dev->dev_addr;
1521 return 0;
1522 }
1523
1524 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1525 {
1526 if (dev->addr_len != INFINIBAND_ALEN)
1527 return -1;
1528 memcpy(eui, dev->dev_addr + 12, 8);
1529 eui[0] |= 2;
1530 return 0;
1531 }
1532
1533 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1534 {
1535 if (addr == 0)
1536 return -1;
1537 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1538 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1539 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1540 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1541 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1542 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1543 eui[1] = 0;
1544 eui[2] = 0x5E;
1545 eui[3] = 0xFE;
1546 memcpy(eui + 4, &addr, 4);
1547 return 0;
1548 }
1549
1550 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1551 {
1552 if (dev->priv_flags & IFF_ISATAP)
1553 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1554 return -1;
1555 }
1556
1557 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
1558 {
1559 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1560 }
1561
1562 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1563 {
1564 switch (dev->type) {
1565 case ARPHRD_ETHER:
1566 case ARPHRD_FDDI:
1567 case ARPHRD_IEEE802_TR:
1568 return addrconf_ifid_eui48(eui, dev);
1569 case ARPHRD_ARCNET:
1570 return addrconf_ifid_arcnet(eui, dev);
1571 case ARPHRD_INFINIBAND:
1572 return addrconf_ifid_infiniband(eui, dev);
1573 case ARPHRD_SIT:
1574 return addrconf_ifid_sit(eui, dev);
1575 case ARPHRD_IPGRE:
1576 return addrconf_ifid_gre(eui, dev);
1577 }
1578 return -1;
1579 }
1580
1581 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1582 {
1583 int err = -1;
1584 struct inet6_ifaddr *ifp;
1585
1586 read_lock_bh(&idev->lock);
1587 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1588 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1589 memcpy(eui, ifp->addr.s6_addr+8, 8);
1590 err = 0;
1591 break;
1592 }
1593 }
1594 read_unlock_bh(&idev->lock);
1595 return err;
1596 }
1597
1598 #ifdef CONFIG_IPV6_PRIVACY
1599 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1600 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1601 {
1602 regen:
1603 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1604 idev->rndid[0] &= ~0x02;
1605
1606 /*
1607 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1608 * check if generated address is not inappropriate
1609 *
1610 * - Reserved subnet anycast (RFC 2526)
1611 * 11111101 11....11 1xxxxxxx
1612 * - ISATAP (RFC4214) 6.1
1613 * 00-00-5E-FE-xx-xx-xx-xx
1614 * - value 0
1615 * - XXX: already assigned to an address on the device
1616 */
1617 if (idev->rndid[0] == 0xfd &&
1618 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1619 (idev->rndid[7]&0x80))
1620 goto regen;
1621 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1622 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1623 goto regen;
1624 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1625 goto regen;
1626 }
1627
1628 return 0;
1629 }
1630
1631 static void ipv6_regen_rndid(unsigned long data)
1632 {
1633 struct inet6_dev *idev = (struct inet6_dev *) data;
1634 unsigned long expires;
1635
1636 rcu_read_lock_bh();
1637 write_lock_bh(&idev->lock);
1638
1639 if (idev->dead)
1640 goto out;
1641
1642 if (__ipv6_regen_rndid(idev) < 0)
1643 goto out;
1644
1645 expires = jiffies +
1646 idev->cnf.temp_prefered_lft * HZ -
1647 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time -
1648 idev->cnf.max_desync_factor * HZ;
1649 if (time_before(expires, jiffies)) {
1650 printk(KERN_WARNING
1651 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1652 idev->dev->name);
1653 goto out;
1654 }
1655
1656 if (!mod_timer(&idev->regen_timer, expires))
1657 in6_dev_hold(idev);
1658
1659 out:
1660 write_unlock_bh(&idev->lock);
1661 rcu_read_unlock_bh();
1662 in6_dev_put(idev);
1663 }
1664
1665 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1666 int ret = 0;
1667
1668 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1669 ret = __ipv6_regen_rndid(idev);
1670 return ret;
1671 }
1672 #endif
1673
1674 /*
1675 * Add prefix route.
1676 */
1677
1678 static void
1679 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1680 unsigned long expires, u32 flags)
1681 {
1682 struct fib6_config cfg = {
1683 .fc_table = RT6_TABLE_PREFIX,
1684 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1685 .fc_ifindex = dev->ifindex,
1686 .fc_expires = expires,
1687 .fc_dst_len = plen,
1688 .fc_flags = RTF_UP | flags,
1689 .fc_nlinfo.nl_net = dev_net(dev),
1690 .fc_protocol = RTPROT_KERNEL,
1691 };
1692
1693 cfg.fc_dst = *pfx;
1694
1695 /* Prevent useless cloning on PtP SIT.
1696 This thing is done here expecting that the whole
1697 class of non-broadcast devices need not cloning.
1698 */
1699 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1700 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1701 cfg.fc_flags |= RTF_NONEXTHOP;
1702 #endif
1703
1704 ip6_route_add(&cfg);
1705 }
1706
1707
1708 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
1709 int plen,
1710 const struct net_device *dev,
1711 u32 flags, u32 noflags)
1712 {
1713 struct fib6_node *fn;
1714 struct rt6_info *rt = NULL;
1715 struct fib6_table *table;
1716
1717 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX);
1718 if (table == NULL)
1719 return NULL;
1720
1721 write_lock_bh(&table->tb6_lock);
1722 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
1723 if (!fn)
1724 goto out;
1725 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1726 if (rt->dst.dev->ifindex != dev->ifindex)
1727 continue;
1728 if ((rt->rt6i_flags & flags) != flags)
1729 continue;
1730 if ((noflags != 0) && ((rt->rt6i_flags & flags) != 0))
1731 continue;
1732 dst_hold(&rt->dst);
1733 break;
1734 }
1735 out:
1736 write_unlock_bh(&table->tb6_lock);
1737 return rt;
1738 }
1739
1740
1741 /* Create "default" multicast route to the interface */
1742
1743 static void addrconf_add_mroute(struct net_device *dev)
1744 {
1745 struct fib6_config cfg = {
1746 .fc_table = RT6_TABLE_LOCAL,
1747 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1748 .fc_ifindex = dev->ifindex,
1749 .fc_dst_len = 8,
1750 .fc_flags = RTF_UP,
1751 .fc_nlinfo.nl_net = dev_net(dev),
1752 };
1753
1754 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1755
1756 ip6_route_add(&cfg);
1757 }
1758
1759 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1760 static void sit_route_add(struct net_device *dev)
1761 {
1762 struct fib6_config cfg = {
1763 .fc_table = RT6_TABLE_MAIN,
1764 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1765 .fc_ifindex = dev->ifindex,
1766 .fc_dst_len = 96,
1767 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1768 .fc_nlinfo.nl_net = dev_net(dev),
1769 };
1770
1771 /* prefix length - 96 bits "::d.d.d.d" */
1772 ip6_route_add(&cfg);
1773 }
1774 #endif
1775
1776 static void addrconf_add_lroute(struct net_device *dev)
1777 {
1778 struct in6_addr addr;
1779
1780 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1781 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1782 }
1783
1784 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1785 {
1786 struct inet6_dev *idev;
1787
1788 ASSERT_RTNL();
1789
1790 idev = ipv6_find_idev(dev);
1791 if (!idev)
1792 return ERR_PTR(-ENOBUFS);
1793
1794 if (idev->cnf.disable_ipv6)
1795 return ERR_PTR(-EACCES);
1796
1797 /* Add default multicast route */
1798 if (!(dev->flags & IFF_LOOPBACK))
1799 addrconf_add_mroute(dev);
1800
1801 /* Add link local route */
1802 addrconf_add_lroute(dev);
1803 return idev;
1804 }
1805
1806 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1807 {
1808 struct prefix_info *pinfo;
1809 __u32 valid_lft;
1810 __u32 prefered_lft;
1811 int addr_type;
1812 struct inet6_dev *in6_dev;
1813 struct net *net = dev_net(dev);
1814
1815 pinfo = (struct prefix_info *) opt;
1816
1817 if (len < sizeof(struct prefix_info)) {
1818 ADBG(("addrconf: prefix option too short\n"));
1819 return;
1820 }
1821
1822 /*
1823 * Validation checks ([ADDRCONF], page 19)
1824 */
1825
1826 addr_type = ipv6_addr_type(&pinfo->prefix);
1827
1828 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1829 return;
1830
1831 valid_lft = ntohl(pinfo->valid);
1832 prefered_lft = ntohl(pinfo->prefered);
1833
1834 if (prefered_lft > valid_lft) {
1835 if (net_ratelimit())
1836 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1837 return;
1838 }
1839
1840 in6_dev = in6_dev_get(dev);
1841
1842 if (in6_dev == NULL) {
1843 if (net_ratelimit())
1844 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1845 return;
1846 }
1847
1848 /*
1849 * Two things going on here:
1850 * 1) Add routes for on-link prefixes
1851 * 2) Configure prefixes with the auto flag set
1852 */
1853
1854 if (pinfo->onlink) {
1855 struct rt6_info *rt;
1856 unsigned long rt_expires;
1857
1858 /* Avoid arithmetic overflow. Really, we could
1859 * save rt_expires in seconds, likely valid_lft,
1860 * but it would require division in fib gc, that it
1861 * not good.
1862 */
1863 if (HZ > USER_HZ)
1864 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
1865 else
1866 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
1867
1868 if (addrconf_finite_timeout(rt_expires))
1869 rt_expires *= HZ;
1870
1871 rt = addrconf_get_prefix_route(&pinfo->prefix,
1872 pinfo->prefix_len,
1873 dev,
1874 RTF_ADDRCONF | RTF_PREFIX_RT,
1875 RTF_GATEWAY | RTF_DEFAULT);
1876
1877 if (rt) {
1878 /* Autoconf prefix route */
1879 if (valid_lft == 0) {
1880 ip6_del_rt(rt);
1881 rt = NULL;
1882 } else if (addrconf_finite_timeout(rt_expires)) {
1883 /* not infinity */
1884 rt->dst.expires = jiffies + rt_expires;
1885 rt->rt6i_flags |= RTF_EXPIRES;
1886 } else {
1887 rt->rt6i_flags &= ~RTF_EXPIRES;
1888 rt->dst.expires = 0;
1889 }
1890 } else if (valid_lft) {
1891 clock_t expires = 0;
1892 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
1893 if (addrconf_finite_timeout(rt_expires)) {
1894 /* not infinity */
1895 flags |= RTF_EXPIRES;
1896 expires = jiffies_to_clock_t(rt_expires);
1897 }
1898 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1899 dev, expires, flags);
1900 }
1901 if (rt)
1902 dst_release(&rt->dst);
1903 }
1904
1905 /* Try to figure out our local address for this prefix */
1906
1907 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1908 struct inet6_ifaddr * ifp;
1909 struct in6_addr addr;
1910 int create = 0, update_lft = 0;
1911
1912 if (pinfo->prefix_len == 64) {
1913 memcpy(&addr, &pinfo->prefix, 8);
1914 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1915 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1916 in6_dev_put(in6_dev);
1917 return;
1918 }
1919 goto ok;
1920 }
1921 if (net_ratelimit())
1922 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1923 pinfo->prefix_len);
1924 in6_dev_put(in6_dev);
1925 return;
1926
1927 ok:
1928
1929 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1930
1931 if (ifp == NULL && valid_lft) {
1932 int max_addresses = in6_dev->cnf.max_addresses;
1933 u32 addr_flags = 0;
1934
1935 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1936 if (in6_dev->cnf.optimistic_dad &&
1937 !net->ipv6.devconf_all->forwarding)
1938 addr_flags = IFA_F_OPTIMISTIC;
1939 #endif
1940
1941 /* Do not allow to create too much of autoconfigured
1942 * addresses; this would be too easy way to crash kernel.
1943 */
1944 if (!max_addresses ||
1945 ipv6_count_addresses(in6_dev) < max_addresses)
1946 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1947 addr_type&IPV6_ADDR_SCOPE_MASK,
1948 addr_flags);
1949
1950 if (!ifp || IS_ERR(ifp)) {
1951 in6_dev_put(in6_dev);
1952 return;
1953 }
1954
1955 update_lft = create = 1;
1956 ifp->cstamp = jiffies;
1957 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1958 }
1959
1960 if (ifp) {
1961 int flags;
1962 unsigned long now;
1963 #ifdef CONFIG_IPV6_PRIVACY
1964 struct inet6_ifaddr *ift;
1965 #endif
1966 u32 stored_lft;
1967
1968 /* update lifetime (RFC2462 5.5.3 e) */
1969 spin_lock(&ifp->lock);
1970 now = jiffies;
1971 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1972 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1973 else
1974 stored_lft = 0;
1975 if (!update_lft && stored_lft) {
1976 if (valid_lft > MIN_VALID_LIFETIME ||
1977 valid_lft > stored_lft)
1978 update_lft = 1;
1979 else if (stored_lft <= MIN_VALID_LIFETIME) {
1980 /* valid_lft <= stored_lft is always true */
1981 /*
1982 * RFC 4862 Section 5.5.3e:
1983 * "Note that the preferred lifetime of
1984 * the corresponding address is always
1985 * reset to the Preferred Lifetime in
1986 * the received Prefix Information
1987 * option, regardless of whether the
1988 * valid lifetime is also reset or
1989 * ignored."
1990 *
1991 * So if the preferred lifetime in
1992 * this advertisement is different
1993 * than what we have stored, but the
1994 * valid lifetime is invalid, just
1995 * reset prefered_lft.
1996 *
1997 * We must set the valid lifetime
1998 * to the stored lifetime since we'll
1999 * be updating the timestamp below,
2000 * else we'll set it back to the
2001 * minimum.
2002 */
2003 if (prefered_lft != ifp->prefered_lft) {
2004 valid_lft = stored_lft;
2005 update_lft = 1;
2006 }
2007 } else {
2008 valid_lft = MIN_VALID_LIFETIME;
2009 if (valid_lft < prefered_lft)
2010 prefered_lft = valid_lft;
2011 update_lft = 1;
2012 }
2013 }
2014
2015 if (update_lft) {
2016 ifp->valid_lft = valid_lft;
2017 ifp->prefered_lft = prefered_lft;
2018 ifp->tstamp = now;
2019 flags = ifp->flags;
2020 ifp->flags &= ~IFA_F_DEPRECATED;
2021 spin_unlock(&ifp->lock);
2022
2023 if (!(flags&IFA_F_TENTATIVE))
2024 ipv6_ifa_notify(0, ifp);
2025 } else
2026 spin_unlock(&ifp->lock);
2027
2028 #ifdef CONFIG_IPV6_PRIVACY
2029 read_lock_bh(&in6_dev->lock);
2030 /* update all temporary addresses in the list */
2031 list_for_each_entry(ift, &in6_dev->tempaddr_list,
2032 tmp_list) {
2033 int age, max_valid, max_prefered;
2034
2035 if (ifp != ift->ifpub)
2036 continue;
2037
2038 /*
2039 * RFC 4941 section 3.3:
2040 * If a received option will extend the lifetime
2041 * of a public address, the lifetimes of
2042 * temporary addresses should be extended,
2043 * subject to the overall constraint that no
2044 * temporary addresses should ever remain
2045 * "valid" or "preferred" for a time longer than
2046 * (TEMP_VALID_LIFETIME) or
2047 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR),
2048 * respectively.
2049 */
2050 age = (now - ift->cstamp) / HZ;
2051 max_valid = in6_dev->cnf.temp_valid_lft - age;
2052 if (max_valid < 0)
2053 max_valid = 0;
2054
2055 max_prefered = in6_dev->cnf.temp_prefered_lft -
2056 in6_dev->cnf.max_desync_factor -
2057 age;
2058 if (max_prefered < 0)
2059 max_prefered = 0;
2060
2061 if (valid_lft > max_valid)
2062 valid_lft = max_valid;
2063
2064 if (prefered_lft > max_prefered)
2065 prefered_lft = max_prefered;
2066
2067 spin_lock(&ift->lock);
2068 flags = ift->flags;
2069 ift->valid_lft = valid_lft;
2070 ift->prefered_lft = prefered_lft;
2071 ift->tstamp = now;
2072 if (prefered_lft > 0)
2073 ift->flags &= ~IFA_F_DEPRECATED;
2074
2075 spin_unlock(&ift->lock);
2076 if (!(flags&IFA_F_TENTATIVE))
2077 ipv6_ifa_notify(0, ift);
2078 }
2079
2080 if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) {
2081 /*
2082 * When a new public address is created as
2083 * described in [ADDRCONF], also create a new
2084 * temporary address. Also create a temporary
2085 * address if it's enabled but no temporary
2086 * address currently exists.
2087 */
2088 read_unlock_bh(&in6_dev->lock);
2089 ipv6_create_tempaddr(ifp, NULL);
2090 } else {
2091 read_unlock_bh(&in6_dev->lock);
2092 }
2093 #endif
2094 in6_ifa_put(ifp);
2095 addrconf_verify(0);
2096 }
2097 }
2098 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2099 in6_dev_put(in6_dev);
2100 }
2101
2102 /*
2103 * Set destination address.
2104 * Special case for SIT interfaces where we create a new "virtual"
2105 * device.
2106 */
2107 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2108 {
2109 struct in6_ifreq ireq;
2110 struct net_device *dev;
2111 int err = -EINVAL;
2112
2113 rtnl_lock();
2114
2115 err = -EFAULT;
2116 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2117 goto err_exit;
2118
2119 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2120
2121 err = -ENODEV;
2122 if (dev == NULL)
2123 goto err_exit;
2124
2125 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2126 if (dev->type == ARPHRD_SIT) {
2127 const struct net_device_ops *ops = dev->netdev_ops;
2128 struct ifreq ifr;
2129 struct ip_tunnel_parm p;
2130
2131 err = -EADDRNOTAVAIL;
2132 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2133 goto err_exit;
2134
2135 memset(&p, 0, sizeof(p));
2136 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2137 p.iph.saddr = 0;
2138 p.iph.version = 4;
2139 p.iph.ihl = 5;
2140 p.iph.protocol = IPPROTO_IPV6;
2141 p.iph.ttl = 64;
2142 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2143
2144 if (ops->ndo_do_ioctl) {
2145 mm_segment_t oldfs = get_fs();
2146
2147 set_fs(KERNEL_DS);
2148 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2149 set_fs(oldfs);
2150 } else
2151 err = -EOPNOTSUPP;
2152
2153 if (err == 0) {
2154 err = -ENOBUFS;
2155 dev = __dev_get_by_name(net, p.name);
2156 if (!dev)
2157 goto err_exit;
2158 err = dev_open(dev);
2159 }
2160 }
2161 #endif
2162
2163 err_exit:
2164 rtnl_unlock();
2165 return err;
2166 }
2167
2168 /*
2169 * Manual configuration of address on an interface
2170 */
2171 static int inet6_addr_add(struct net *net, int ifindex, const struct in6_addr *pfx,
2172 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
2173 __u32 valid_lft)
2174 {
2175 struct inet6_ifaddr *ifp;
2176 struct inet6_dev *idev;
2177 struct net_device *dev;
2178 int scope;
2179 u32 flags;
2180 clock_t expires;
2181 unsigned long timeout;
2182
2183 ASSERT_RTNL();
2184
2185 if (plen > 128)
2186 return -EINVAL;
2187
2188 /* check the lifetime */
2189 if (!valid_lft || prefered_lft > valid_lft)
2190 return -EINVAL;
2191
2192 dev = __dev_get_by_index(net, ifindex);
2193 if (!dev)
2194 return -ENODEV;
2195
2196 idev = addrconf_add_dev(dev);
2197 if (IS_ERR(idev))
2198 return PTR_ERR(idev);
2199
2200 scope = ipv6_addr_scope(pfx);
2201
2202 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2203 if (addrconf_finite_timeout(timeout)) {
2204 expires = jiffies_to_clock_t(timeout * HZ);
2205 valid_lft = timeout;
2206 flags = RTF_EXPIRES;
2207 } else {
2208 expires = 0;
2209 flags = 0;
2210 ifa_flags |= IFA_F_PERMANENT;
2211 }
2212
2213 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2214 if (addrconf_finite_timeout(timeout)) {
2215 if (timeout == 0)
2216 ifa_flags |= IFA_F_DEPRECATED;
2217 prefered_lft = timeout;
2218 }
2219
2220 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2221
2222 if (!IS_ERR(ifp)) {
2223 spin_lock_bh(&ifp->lock);
2224 ifp->valid_lft = valid_lft;
2225 ifp->prefered_lft = prefered_lft;
2226 ifp->tstamp = jiffies;
2227 spin_unlock_bh(&ifp->lock);
2228
2229 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2230 expires, flags);
2231 /*
2232 * Note that section 3.1 of RFC 4429 indicates
2233 * that the Optimistic flag should not be set for
2234 * manually configured addresses
2235 */
2236 addrconf_dad_start(ifp, 0);
2237 in6_ifa_put(ifp);
2238 addrconf_verify(0);
2239 return 0;
2240 }
2241
2242 return PTR_ERR(ifp);
2243 }
2244
2245 static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx,
2246 unsigned int plen)
2247 {
2248 struct inet6_ifaddr *ifp;
2249 struct inet6_dev *idev;
2250 struct net_device *dev;
2251
2252 if (plen > 128)
2253 return -EINVAL;
2254
2255 dev = __dev_get_by_index(net, ifindex);
2256 if (!dev)
2257 return -ENODEV;
2258
2259 if ((idev = __in6_dev_get(dev)) == NULL)
2260 return -ENXIO;
2261
2262 read_lock_bh(&idev->lock);
2263 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2264 if (ifp->prefix_len == plen &&
2265 ipv6_addr_equal(pfx, &ifp->addr)) {
2266 in6_ifa_hold(ifp);
2267 read_unlock_bh(&idev->lock);
2268
2269 ipv6_del_addr(ifp);
2270
2271 /* If the last address is deleted administratively,
2272 disable IPv6 on this interface.
2273 */
2274 if (list_empty(&idev->addr_list))
2275 addrconf_ifdown(idev->dev, 1);
2276 return 0;
2277 }
2278 }
2279 read_unlock_bh(&idev->lock);
2280 return -EADDRNOTAVAIL;
2281 }
2282
2283
2284 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2285 {
2286 struct in6_ifreq ireq;
2287 int err;
2288
2289 if (!capable(CAP_NET_ADMIN))
2290 return -EPERM;
2291
2292 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2293 return -EFAULT;
2294
2295 rtnl_lock();
2296 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2297 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2298 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2299 rtnl_unlock();
2300 return err;
2301 }
2302
2303 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2304 {
2305 struct in6_ifreq ireq;
2306 int err;
2307
2308 if (!capable(CAP_NET_ADMIN))
2309 return -EPERM;
2310
2311 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2312 return -EFAULT;
2313
2314 rtnl_lock();
2315 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2316 ireq.ifr6_prefixlen);
2317 rtnl_unlock();
2318 return err;
2319 }
2320
2321 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2322 int plen, int scope)
2323 {
2324 struct inet6_ifaddr *ifp;
2325
2326 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT);
2327 if (!IS_ERR(ifp)) {
2328 spin_lock_bh(&ifp->lock);
2329 ifp->flags &= ~IFA_F_TENTATIVE;
2330 spin_unlock_bh(&ifp->lock);
2331 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2332 in6_ifa_put(ifp);
2333 }
2334 }
2335
2336 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2337 static void sit_add_v4_addrs(struct inet6_dev *idev)
2338 {
2339 struct in6_addr addr;
2340 struct net_device *dev;
2341 struct net *net = dev_net(idev->dev);
2342 int scope;
2343
2344 ASSERT_RTNL();
2345
2346 memset(&addr, 0, sizeof(struct in6_addr));
2347 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2348
2349 if (idev->dev->flags&IFF_POINTOPOINT) {
2350 addr.s6_addr32[0] = htonl(0xfe800000);
2351 scope = IFA_LINK;
2352 } else {
2353 scope = IPV6_ADDR_COMPATv4;
2354 }
2355
2356 if (addr.s6_addr32[3]) {
2357 add_addr(idev, &addr, 128, scope);
2358 return;
2359 }
2360
2361 for_each_netdev(net, dev) {
2362 struct in_device * in_dev = __in_dev_get_rtnl(dev);
2363 if (in_dev && (dev->flags & IFF_UP)) {
2364 struct in_ifaddr * ifa;
2365
2366 int flag = scope;
2367
2368 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2369 int plen;
2370
2371 addr.s6_addr32[3] = ifa->ifa_local;
2372
2373 if (ifa->ifa_scope == RT_SCOPE_LINK)
2374 continue;
2375 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2376 if (idev->dev->flags&IFF_POINTOPOINT)
2377 continue;
2378 flag |= IFA_HOST;
2379 }
2380 if (idev->dev->flags&IFF_POINTOPOINT)
2381 plen = 64;
2382 else
2383 plen = 96;
2384
2385 add_addr(idev, &addr, plen, flag);
2386 }
2387 }
2388 }
2389 }
2390 #endif
2391
2392 static void init_loopback(struct net_device *dev)
2393 {
2394 struct inet6_dev *idev;
2395
2396 /* ::1 */
2397
2398 ASSERT_RTNL();
2399
2400 if ((idev = ipv6_find_idev(dev)) == NULL) {
2401 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2402 return;
2403 }
2404
2405 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2406 }
2407
2408 static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr)
2409 {
2410 struct inet6_ifaddr * ifp;
2411 u32 addr_flags = IFA_F_PERMANENT;
2412
2413 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2414 if (idev->cnf.optimistic_dad &&
2415 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2416 addr_flags |= IFA_F_OPTIMISTIC;
2417 #endif
2418
2419
2420 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2421 if (!IS_ERR(ifp)) {
2422 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2423 addrconf_dad_start(ifp, 0);
2424 in6_ifa_put(ifp);
2425 }
2426 }
2427
2428 static void addrconf_dev_config(struct net_device *dev)
2429 {
2430 struct in6_addr addr;
2431 struct inet6_dev * idev;
2432
2433 ASSERT_RTNL();
2434
2435 if ((dev->type != ARPHRD_ETHER) &&
2436 (dev->type != ARPHRD_FDDI) &&
2437 (dev->type != ARPHRD_IEEE802_TR) &&
2438 (dev->type != ARPHRD_ARCNET) &&
2439 (dev->type != ARPHRD_INFINIBAND)) {
2440 /* Alas, we support only Ethernet autoconfiguration. */
2441 return;
2442 }
2443
2444 idev = addrconf_add_dev(dev);
2445 if (IS_ERR(idev))
2446 return;
2447
2448 memset(&addr, 0, sizeof(struct in6_addr));
2449 addr.s6_addr32[0] = htonl(0xFE800000);
2450
2451 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2452 addrconf_add_linklocal(idev, &addr);
2453 }
2454
2455 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2456 static void addrconf_sit_config(struct net_device *dev)
2457 {
2458 struct inet6_dev *idev;
2459
2460 ASSERT_RTNL();
2461
2462 /*
2463 * Configure the tunnel with one of our IPv4
2464 * addresses... we should configure all of
2465 * our v4 addrs in the tunnel
2466 */
2467
2468 if ((idev = ipv6_find_idev(dev)) == NULL) {
2469 printk(KERN_DEBUG "init sit: add_dev failed\n");
2470 return;
2471 }
2472
2473 if (dev->priv_flags & IFF_ISATAP) {
2474 struct in6_addr addr;
2475
2476 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2477 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2478 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2479 addrconf_add_linklocal(idev, &addr);
2480 return;
2481 }
2482
2483 sit_add_v4_addrs(idev);
2484
2485 if (dev->flags&IFF_POINTOPOINT) {
2486 addrconf_add_mroute(dev);
2487 addrconf_add_lroute(dev);
2488 } else
2489 sit_route_add(dev);
2490 }
2491 #endif
2492
2493 #if defined(CONFIG_NET_IPGRE) || defined(CONFIG_NET_IPGRE_MODULE)
2494 static void addrconf_gre_config(struct net_device *dev)
2495 {
2496 struct inet6_dev *idev;
2497 struct in6_addr addr;
2498
2499 pr_info("ipv6: addrconf_gre_config(%s)\n", dev->name);
2500
2501 ASSERT_RTNL();
2502
2503 if ((idev = ipv6_find_idev(dev)) == NULL) {
2504 printk(KERN_DEBUG "init gre: add_dev failed\n");
2505 return;
2506 }
2507
2508 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2509 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2510
2511 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2512 addrconf_add_linklocal(idev, &addr);
2513 }
2514 #endif
2515
2516 static inline int
2517 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2518 {
2519 struct in6_addr lladdr;
2520
2521 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2522 addrconf_add_linklocal(idev, &lladdr);
2523 return 0;
2524 }
2525 return -1;
2526 }
2527
2528 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2529 {
2530 struct net_device *link_dev;
2531 struct net *net = dev_net(idev->dev);
2532
2533 /* first try to inherit the link-local address from the link device */
2534 if (idev->dev->iflink &&
2535 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
2536 if (!ipv6_inherit_linklocal(idev, link_dev))
2537 return;
2538 }
2539 /* then try to inherit it from any device */
2540 for_each_netdev(net, link_dev) {
2541 if (!ipv6_inherit_linklocal(idev, link_dev))
2542 return;
2543 }
2544 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2545 }
2546
2547 /*
2548 * Autoconfigure tunnel with a link-local address so routing protocols,
2549 * DHCPv6, MLD etc. can be run over the virtual link
2550 */
2551
2552 static void addrconf_ip6_tnl_config(struct net_device *dev)
2553 {
2554 struct inet6_dev *idev;
2555
2556 ASSERT_RTNL();
2557
2558 idev = addrconf_add_dev(dev);
2559 if (IS_ERR(idev)) {
2560 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2561 return;
2562 }
2563 ip6_tnl_add_linklocal(idev);
2564 }
2565
2566 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2567 void * data)
2568 {
2569 struct net_device *dev = (struct net_device *) data;
2570 struct inet6_dev *idev = __in6_dev_get(dev);
2571 int run_pending = 0;
2572 int err;
2573
2574 switch (event) {
2575 case NETDEV_REGISTER:
2576 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2577 idev = ipv6_add_dev(dev);
2578 if (!idev)
2579 return notifier_from_errno(-ENOMEM);
2580 }
2581 break;
2582
2583 case NETDEV_UP:
2584 case NETDEV_CHANGE:
2585 if (dev->flags & IFF_SLAVE)
2586 break;
2587
2588 if (event == NETDEV_UP) {
2589 if (!addrconf_qdisc_ok(dev)) {
2590 /* device is not ready yet. */
2591 printk(KERN_INFO
2592 "ADDRCONF(NETDEV_UP): %s: "
2593 "link is not ready\n",
2594 dev->name);
2595 break;
2596 }
2597
2598 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2599 idev = ipv6_add_dev(dev);
2600
2601 if (idev) {
2602 idev->if_flags |= IF_READY;
2603 run_pending = 1;
2604 }
2605 } else {
2606 if (!addrconf_qdisc_ok(dev)) {
2607 /* device is still not ready. */
2608 break;
2609 }
2610
2611 if (idev) {
2612 if (idev->if_flags & IF_READY)
2613 /* device is already configured. */
2614 break;
2615 idev->if_flags |= IF_READY;
2616 }
2617
2618 printk(KERN_INFO
2619 "ADDRCONF(NETDEV_CHANGE): %s: "
2620 "link becomes ready\n",
2621 dev->name);
2622
2623 run_pending = 1;
2624 }
2625
2626 switch (dev->type) {
2627 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2628 case ARPHRD_SIT:
2629 addrconf_sit_config(dev);
2630 break;
2631 #endif
2632 #if defined(CONFIG_NET_IPGRE) || defined(CONFIG_NET_IPGRE_MODULE)
2633 case ARPHRD_IPGRE:
2634 addrconf_gre_config(dev);
2635 break;
2636 #endif
2637 case ARPHRD_TUNNEL6:
2638 addrconf_ip6_tnl_config(dev);
2639 break;
2640 case ARPHRD_LOOPBACK:
2641 init_loopback(dev);
2642 break;
2643
2644 default:
2645 addrconf_dev_config(dev);
2646 break;
2647 }
2648
2649 if (idev) {
2650 if (run_pending)
2651 addrconf_dad_run(idev);
2652
2653 /*
2654 * If the MTU changed during the interface down,
2655 * when the interface up, the changed MTU must be
2656 * reflected in the idev as well as routers.
2657 */
2658 if (idev->cnf.mtu6 != dev->mtu &&
2659 dev->mtu >= IPV6_MIN_MTU) {
2660 rt6_mtu_change(dev, dev->mtu);
2661 idev->cnf.mtu6 = dev->mtu;
2662 }
2663 idev->tstamp = jiffies;
2664 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2665
2666 /*
2667 * If the changed mtu during down is lower than
2668 * IPV6_MIN_MTU stop IPv6 on this interface.
2669 */
2670 if (dev->mtu < IPV6_MIN_MTU)
2671 addrconf_ifdown(dev, 1);
2672 }
2673 break;
2674
2675 case NETDEV_CHANGEMTU:
2676 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2677 rt6_mtu_change(dev, dev->mtu);
2678 idev->cnf.mtu6 = dev->mtu;
2679 break;
2680 }
2681
2682 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2683 idev = ipv6_add_dev(dev);
2684 if (idev)
2685 break;
2686 }
2687
2688 /*
2689 * MTU falled under IPV6_MIN_MTU.
2690 * Stop IPv6 on this interface.
2691 */
2692
2693 case NETDEV_DOWN:
2694 case NETDEV_UNREGISTER:
2695 /*
2696 * Remove all addresses from this interface.
2697 */
2698 addrconf_ifdown(dev, event != NETDEV_DOWN);
2699 break;
2700
2701 case NETDEV_CHANGENAME:
2702 if (idev) {
2703 snmp6_unregister_dev(idev);
2704 addrconf_sysctl_unregister(idev);
2705 addrconf_sysctl_register(idev);
2706 err = snmp6_register_dev(idev);
2707 if (err)
2708 return notifier_from_errno(err);
2709 }
2710 break;
2711
2712 case NETDEV_PRE_TYPE_CHANGE:
2713 case NETDEV_POST_TYPE_CHANGE:
2714 addrconf_type_change(dev, event);
2715 break;
2716 }
2717
2718 return NOTIFY_OK;
2719 }
2720
2721 /*
2722 * addrconf module should be notified of a device going up
2723 */
2724 static struct notifier_block ipv6_dev_notf = {
2725 .notifier_call = addrconf_notify,
2726 };
2727
2728 static void addrconf_type_change(struct net_device *dev, unsigned long event)
2729 {
2730 struct inet6_dev *idev;
2731 ASSERT_RTNL();
2732
2733 idev = __in6_dev_get(dev);
2734
2735 if (event == NETDEV_POST_TYPE_CHANGE)
2736 ipv6_mc_remap(idev);
2737 else if (event == NETDEV_PRE_TYPE_CHANGE)
2738 ipv6_mc_unmap(idev);
2739 }
2740
2741 static int addrconf_ifdown(struct net_device *dev, int how)
2742 {
2743 struct net *net = dev_net(dev);
2744 struct inet6_dev *idev;
2745 struct inet6_ifaddr *ifa;
2746 int state, i;
2747
2748 ASSERT_RTNL();
2749
2750 rt6_ifdown(net, dev);
2751 neigh_ifdown(&nd_tbl, dev);
2752
2753 idev = __in6_dev_get(dev);
2754 if (idev == NULL)
2755 return -ENODEV;
2756
2757 /*
2758 * Step 1: remove reference to ipv6 device from parent device.
2759 * Do not dev_put!
2760 */
2761 if (how) {
2762 idev->dead = 1;
2763
2764 /* protected by rtnl_lock */
2765 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
2766
2767 /* Step 1.5: remove snmp6 entry */
2768 snmp6_unregister_dev(idev);
2769
2770 }
2771
2772 /* Step 2: clear hash table */
2773 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
2774 struct hlist_head *h = &inet6_addr_lst[i];
2775 struct hlist_node *n;
2776
2777 spin_lock_bh(&addrconf_hash_lock);
2778 restart:
2779 hlist_for_each_entry_rcu(ifa, n, h, addr_lst) {
2780 if (ifa->idev == idev) {
2781 hlist_del_init_rcu(&ifa->addr_lst);
2782 addrconf_del_timer(ifa);
2783 goto restart;
2784 }
2785 }
2786 spin_unlock_bh(&addrconf_hash_lock);
2787 }
2788
2789 write_lock_bh(&idev->lock);
2790
2791 /* Step 2: clear flags for stateless addrconf */
2792 if (!how)
2793 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2794
2795 #ifdef CONFIG_IPV6_PRIVACY
2796 if (how && del_timer(&idev->regen_timer))
2797 in6_dev_put(idev);
2798
2799 /* Step 3: clear tempaddr list */
2800 while (!list_empty(&idev->tempaddr_list)) {
2801 ifa = list_first_entry(&idev->tempaddr_list,
2802 struct inet6_ifaddr, tmp_list);
2803 list_del(&ifa->tmp_list);
2804 write_unlock_bh(&idev->lock);
2805 spin_lock_bh(&ifa->lock);
2806
2807 if (ifa->ifpub) {
2808 in6_ifa_put(ifa->ifpub);
2809 ifa->ifpub = NULL;
2810 }
2811 spin_unlock_bh(&ifa->lock);
2812 in6_ifa_put(ifa);
2813 write_lock_bh(&idev->lock);
2814 }
2815 #endif
2816
2817 while (!list_empty(&idev->addr_list)) {
2818 ifa = list_first_entry(&idev->addr_list,
2819 struct inet6_ifaddr, if_list);
2820 addrconf_del_timer(ifa);
2821
2822 list_del(&ifa->if_list);
2823
2824 write_unlock_bh(&idev->lock);
2825
2826 spin_lock_bh(&ifa->state_lock);
2827 state = ifa->state;
2828 ifa->state = INET6_IFADDR_STATE_DEAD;
2829 spin_unlock_bh(&ifa->state_lock);
2830
2831 if (state != INET6_IFADDR_STATE_DEAD) {
2832 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2833 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2834 }
2835 in6_ifa_put(ifa);
2836
2837 write_lock_bh(&idev->lock);
2838 }
2839
2840 write_unlock_bh(&idev->lock);
2841
2842 /* Step 5: Discard multicast list */
2843 if (how)
2844 ipv6_mc_destroy_dev(idev);
2845 else
2846 ipv6_mc_down(idev);
2847
2848 idev->tstamp = jiffies;
2849
2850 /* Last: Shot the device (if unregistered) */
2851 if (how) {
2852 addrconf_sysctl_unregister(idev);
2853 neigh_parms_release(&nd_tbl, idev->nd_parms);
2854 neigh_ifdown(&nd_tbl, dev);
2855 in6_dev_put(idev);
2856 }
2857 return 0;
2858 }
2859
2860 static void addrconf_rs_timer(unsigned long data)
2861 {
2862 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2863 struct inet6_dev *idev = ifp->idev;
2864
2865 read_lock(&idev->lock);
2866 if (idev->dead || !(idev->if_flags & IF_READY))
2867 goto out;
2868
2869 if (idev->cnf.forwarding)
2870 goto out;
2871
2872 /* Announcement received after solicitation was sent */
2873 if (idev->if_flags & IF_RA_RCVD)
2874 goto out;
2875
2876 spin_lock(&ifp->lock);
2877 if (ifp->probes++ < idev->cnf.rtr_solicits) {
2878 /* The wait after the last probe can be shorter */
2879 addrconf_mod_timer(ifp, AC_RS,
2880 (ifp->probes == idev->cnf.rtr_solicits) ?
2881 idev->cnf.rtr_solicit_delay :
2882 idev->cnf.rtr_solicit_interval);
2883 spin_unlock(&ifp->lock);
2884
2885 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2886 } else {
2887 spin_unlock(&ifp->lock);
2888 /*
2889 * Note: we do not support deprecated "all on-link"
2890 * assumption any longer.
2891 */
2892 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2893 idev->dev->name);
2894 }
2895
2896 out:
2897 read_unlock(&idev->lock);
2898 in6_ifa_put(ifp);
2899 }
2900
2901 /*
2902 * Duplicate Address Detection
2903 */
2904 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2905 {
2906 unsigned long rand_num;
2907 struct inet6_dev *idev = ifp->idev;
2908
2909 if (ifp->flags & IFA_F_OPTIMISTIC)
2910 rand_num = 0;
2911 else
2912 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2913
2914 ifp->probes = idev->cnf.dad_transmits;
2915 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2916 }
2917
2918 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2919 {
2920 struct inet6_dev *idev = ifp->idev;
2921 struct net_device *dev = idev->dev;
2922
2923 addrconf_join_solict(dev, &ifp->addr);
2924
2925 net_srandom(ifp->addr.s6_addr32[3]);
2926
2927 read_lock_bh(&idev->lock);
2928 spin_lock(&ifp->lock);
2929 if (ifp->state == INET6_IFADDR_STATE_DEAD)
2930 goto out;
2931
2932 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2933 idev->cnf.accept_dad < 1 ||
2934 !(ifp->flags&IFA_F_TENTATIVE) ||
2935 ifp->flags & IFA_F_NODAD) {
2936 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
2937 spin_unlock(&ifp->lock);
2938 read_unlock_bh(&idev->lock);
2939
2940 addrconf_dad_completed(ifp);
2941 return;
2942 }
2943
2944 if (!(idev->if_flags & IF_READY)) {
2945 spin_unlock(&ifp->lock);
2946 read_unlock_bh(&idev->lock);
2947 /*
2948 * If the device is not ready:
2949 * - keep it tentative if it is a permanent address.
2950 * - otherwise, kill it.
2951 */
2952 in6_ifa_hold(ifp);
2953 addrconf_dad_stop(ifp, 0);
2954 return;
2955 }
2956
2957 /*
2958 * Optimistic nodes can start receiving
2959 * Frames right away
2960 */
2961 if (ifp->flags & IFA_F_OPTIMISTIC)
2962 ip6_ins_rt(ifp->rt);
2963
2964 addrconf_dad_kick(ifp);
2965 out:
2966 spin_unlock(&ifp->lock);
2967 read_unlock_bh(&idev->lock);
2968 }
2969
2970 static void addrconf_dad_timer(unsigned long data)
2971 {
2972 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2973 struct inet6_dev *idev = ifp->idev;
2974 struct in6_addr mcaddr;
2975
2976 if (!ifp->probes && addrconf_dad_end(ifp))
2977 goto out;
2978
2979 read_lock(&idev->lock);
2980 if (idev->dead || !(idev->if_flags & IF_READY)) {
2981 read_unlock(&idev->lock);
2982 goto out;
2983 }
2984
2985 spin_lock(&ifp->lock);
2986 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
2987 spin_unlock(&ifp->lock);
2988 read_unlock(&idev->lock);
2989 goto out;
2990 }
2991
2992 if (ifp->probes == 0) {
2993 /*
2994 * DAD was successful
2995 */
2996
2997 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
2998 spin_unlock(&ifp->lock);
2999 read_unlock(&idev->lock);
3000
3001 addrconf_dad_completed(ifp);
3002
3003 goto out;
3004 }
3005
3006 ifp->probes--;
3007 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
3008 spin_unlock(&ifp->lock);
3009 read_unlock(&idev->lock);
3010
3011 /* send a neighbour solicitation for our addr */
3012 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3013 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
3014 out:
3015 in6_ifa_put(ifp);
3016 }
3017
3018 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3019 {
3020 struct net_device *dev = ifp->idev->dev;
3021
3022 /*
3023 * Configure the address for reception. Now it is valid.
3024 */
3025
3026 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3027
3028 /* If added prefix is link local and we are prepared to process
3029 router advertisements, start sending router solicitations.
3030 */
3031
3032 if (((ifp->idev->cnf.accept_ra == 1 && !ifp->idev->cnf.forwarding) ||
3033 ifp->idev->cnf.accept_ra == 2) &&
3034 ifp->idev->cnf.rtr_solicits > 0 &&
3035 (dev->flags&IFF_LOOPBACK) == 0 &&
3036 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
3037 /*
3038 * If a host as already performed a random delay
3039 * [...] as part of DAD [...] there is no need
3040 * to delay again before sending the first RS
3041 */
3042 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
3043
3044 spin_lock_bh(&ifp->lock);
3045 ifp->probes = 1;
3046 ifp->idev->if_flags |= IF_RS_SENT;
3047 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
3048 spin_unlock_bh(&ifp->lock);
3049 }
3050 }
3051
3052 static void addrconf_dad_run(struct inet6_dev *idev)
3053 {
3054 struct inet6_ifaddr *ifp;
3055
3056 read_lock_bh(&idev->lock);
3057 list_for_each_entry(ifp, &idev->addr_list, if_list) {
3058 spin_lock(&ifp->lock);
3059 if (ifp->flags & IFA_F_TENTATIVE &&
3060 ifp->state == INET6_IFADDR_STATE_DAD)
3061 addrconf_dad_kick(ifp);
3062 spin_unlock(&ifp->lock);
3063 }
3064 read_unlock_bh(&idev->lock);
3065 }
3066
3067 #ifdef CONFIG_PROC_FS
3068 struct if6_iter_state {
3069 struct seq_net_private p;
3070 int bucket;
3071 };
3072
3073 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
3074 {
3075 struct inet6_ifaddr *ifa = NULL;
3076 struct if6_iter_state *state = seq->private;
3077 struct net *net = seq_file_net(seq);
3078
3079 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3080 struct hlist_node *n;
3081 hlist_for_each_entry_rcu_bh(ifa, n, &inet6_addr_lst[state->bucket],
3082 addr_lst)
3083 if (net_eq(dev_net(ifa->idev->dev), net))
3084 return ifa;
3085 }
3086 return NULL;
3087 }
3088
3089 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3090 struct inet6_ifaddr *ifa)
3091 {
3092 struct if6_iter_state *state = seq->private;
3093 struct net *net = seq_file_net(seq);
3094 struct hlist_node *n = &ifa->addr_lst;
3095
3096 hlist_for_each_entry_continue_rcu_bh(ifa, n, addr_lst)
3097 if (net_eq(dev_net(ifa->idev->dev), net))
3098 return ifa;
3099
3100 while (++state->bucket < IN6_ADDR_HSIZE) {
3101 hlist_for_each_entry_rcu_bh(ifa, n,
3102 &inet6_addr_lst[state->bucket], addr_lst) {
3103 if (net_eq(dev_net(ifa->idev->dev), net))
3104 return ifa;
3105 }
3106 }
3107
3108 return NULL;
3109 }
3110
3111 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
3112 {
3113 struct inet6_ifaddr *ifa = if6_get_first(seq);
3114
3115 if (ifa)
3116 while (pos && (ifa = if6_get_next(seq, ifa)) != NULL)
3117 --pos;
3118 return pos ? NULL : ifa;
3119 }
3120
3121 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3122 __acquires(rcu_bh)
3123 {
3124 rcu_read_lock_bh();
3125 return if6_get_idx(seq, *pos);
3126 }
3127
3128 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3129 {
3130 struct inet6_ifaddr *ifa;
3131
3132 ifa = if6_get_next(seq, v);
3133 ++*pos;
3134 return ifa;
3135 }
3136
3137 static void if6_seq_stop(struct seq_file *seq, void *v)
3138 __releases(rcu_bh)
3139 {
3140 rcu_read_unlock_bh();
3141 }
3142
3143 static int if6_seq_show(struct seq_file *seq, void *v)
3144 {
3145 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3146 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3147 &ifp->addr,
3148 ifp->idev->dev->ifindex,
3149 ifp->prefix_len,
3150 ifp->scope,
3151 ifp->flags,
3152 ifp->idev->dev->name);
3153 return 0;
3154 }
3155
3156 static const struct seq_operations if6_seq_ops = {
3157 .start = if6_seq_start,
3158 .next = if6_seq_next,
3159 .show = if6_seq_show,
3160 .stop = if6_seq_stop,
3161 };
3162
3163 static int if6_seq_open(struct inode *inode, struct file *file)
3164 {
3165 return seq_open_net(inode, file, &if6_seq_ops,
3166 sizeof(struct if6_iter_state));
3167 }
3168
3169 static const struct file_operations if6_fops = {
3170 .owner = THIS_MODULE,
3171 .open = if6_seq_open,
3172 .read = seq_read,
3173 .llseek = seq_lseek,
3174 .release = seq_release_net,
3175 };
3176
3177 static int __net_init if6_proc_net_init(struct net *net)
3178 {
3179 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
3180 return -ENOMEM;
3181 return 0;
3182 }
3183
3184 static void __net_exit if6_proc_net_exit(struct net *net)
3185 {
3186 proc_net_remove(net, "if_inet6");
3187 }
3188
3189 static struct pernet_operations if6_proc_net_ops = {
3190 .init = if6_proc_net_init,
3191 .exit = if6_proc_net_exit,
3192 };
3193
3194 int __init if6_proc_init(void)
3195 {
3196 return register_pernet_subsys(&if6_proc_net_ops);
3197 }
3198
3199 void if6_proc_exit(void)
3200 {
3201 unregister_pernet_subsys(&if6_proc_net_ops);
3202 }
3203 #endif /* CONFIG_PROC_FS */
3204
3205 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3206 /* Check if address is a home address configured on any interface. */
3207 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3208 {
3209 int ret = 0;
3210 struct inet6_ifaddr *ifp = NULL;
3211 struct hlist_node *n;
3212 unsigned int hash = ipv6_addr_hash(addr);
3213
3214 rcu_read_lock_bh();
3215 hlist_for_each_entry_rcu_bh(ifp, n, &inet6_addr_lst[hash], addr_lst) {
3216 if (!net_eq(dev_net(ifp->idev->dev), net))
3217 continue;
3218 if (ipv6_addr_equal(&ifp->addr, addr) &&
3219 (ifp->flags & IFA_F_HOMEADDRESS)) {
3220 ret = 1;
3221 break;
3222 }
3223 }
3224 rcu_read_unlock_bh();
3225 return ret;
3226 }
3227 #endif
3228
3229 /*
3230 * Periodic address status verification
3231 */
3232
3233 static void addrconf_verify(unsigned long foo)
3234 {
3235 unsigned long now, next, next_sec, next_sched;
3236 struct inet6_ifaddr *ifp;
3237 struct hlist_node *node;
3238 int i;
3239
3240 rcu_read_lock_bh();
3241 spin_lock(&addrconf_verify_lock);
3242 now = jiffies;
3243 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3244
3245 del_timer(&addr_chk_timer);
3246
3247 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3248 restart:
3249 hlist_for_each_entry_rcu_bh(ifp, node,
3250 &inet6_addr_lst[i], addr_lst) {
3251 unsigned long age;
3252
3253 if (ifp->flags & IFA_F_PERMANENT)
3254 continue;
3255
3256 spin_lock(&ifp->lock);
3257 /* We try to batch several events at once. */
3258 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3259
3260 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3261 age >= ifp->valid_lft) {
3262 spin_unlock(&ifp->lock);
3263 in6_ifa_hold(ifp);
3264 ipv6_del_addr(ifp);
3265 goto restart;
3266 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3267 spin_unlock(&ifp->lock);
3268 continue;
3269 } else if (age >= ifp->prefered_lft) {
3270 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3271 int deprecate = 0;
3272
3273 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3274 deprecate = 1;
3275 ifp->flags |= IFA_F_DEPRECATED;
3276 }
3277
3278 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3279 next = ifp->tstamp + ifp->valid_lft * HZ;
3280
3281 spin_unlock(&ifp->lock);
3282
3283 if (deprecate) {
3284 in6_ifa_hold(ifp);
3285
3286 ipv6_ifa_notify(0, ifp);
3287 in6_ifa_put(ifp);
3288 goto restart;
3289 }
3290 #ifdef CONFIG_IPV6_PRIVACY
3291 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3292 !(ifp->flags&IFA_F_TENTATIVE)) {
3293 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3294 ifp->idev->cnf.dad_transmits *
3295 ifp->idev->nd_parms->retrans_time / HZ;
3296
3297 if (age >= ifp->prefered_lft - regen_advance) {
3298 struct inet6_ifaddr *ifpub = ifp->ifpub;
3299 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3300 next = ifp->tstamp + ifp->prefered_lft * HZ;
3301 if (!ifp->regen_count && ifpub) {
3302 ifp->regen_count++;
3303 in6_ifa_hold(ifp);
3304 in6_ifa_hold(ifpub);
3305 spin_unlock(&ifp->lock);
3306
3307 spin_lock(&ifpub->lock);
3308 ifpub->regen_count = 0;
3309 spin_unlock(&ifpub->lock);
3310 ipv6_create_tempaddr(ifpub, ifp);
3311 in6_ifa_put(ifpub);
3312 in6_ifa_put(ifp);
3313 goto restart;
3314 }
3315 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3316 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3317 spin_unlock(&ifp->lock);
3318 #endif
3319 } else {
3320 /* ifp->prefered_lft <= ifp->valid_lft */
3321 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3322 next = ifp->tstamp + ifp->prefered_lft * HZ;
3323 spin_unlock(&ifp->lock);
3324 }
3325 }
3326 }
3327
3328 next_sec = round_jiffies_up(next);
3329 next_sched = next;
3330
3331 /* If rounded timeout is accurate enough, accept it. */
3332 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3333 next_sched = next_sec;
3334
3335 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3336 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3337 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3338
3339 ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3340 now, next, next_sec, next_sched));
3341
3342 addr_chk_timer.expires = next_sched;
3343 add_timer(&addr_chk_timer);
3344 spin_unlock(&addrconf_verify_lock);
3345 rcu_read_unlock_bh();
3346 }
3347
3348 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3349 {
3350 struct in6_addr *pfx = NULL;
3351
3352 if (addr)
3353 pfx = nla_data(addr);
3354
3355 if (local) {
3356 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3357 pfx = NULL;
3358 else
3359 pfx = nla_data(local);
3360 }
3361
3362 return pfx;
3363 }
3364
3365 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3366 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3367 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3368 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3369 };
3370
3371 static int
3372 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3373 {
3374 struct net *net = sock_net(skb->sk);
3375 struct ifaddrmsg *ifm;
3376 struct nlattr *tb[IFA_MAX+1];
3377 struct in6_addr *pfx;
3378 int err;
3379
3380 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3381 if (err < 0)
3382 return err;
3383
3384 ifm = nlmsg_data(nlh);
3385 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3386 if (pfx == NULL)
3387 return -EINVAL;
3388
3389 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3390 }
3391
3392 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3393 u32 prefered_lft, u32 valid_lft)
3394 {
3395 u32 flags;
3396 clock_t expires;
3397 unsigned long timeout;
3398
3399 if (!valid_lft || (prefered_lft > valid_lft))
3400 return -EINVAL;
3401
3402 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3403 if (addrconf_finite_timeout(timeout)) {
3404 expires = jiffies_to_clock_t(timeout * HZ);
3405 valid_lft = timeout;
3406 flags = RTF_EXPIRES;
3407 } else {
3408 expires = 0;
3409 flags = 0;
3410 ifa_flags |= IFA_F_PERMANENT;
3411 }
3412
3413 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3414 if (addrconf_finite_timeout(timeout)) {
3415 if (timeout == 0)
3416 ifa_flags |= IFA_F_DEPRECATED;
3417 prefered_lft = timeout;
3418 }
3419
3420 spin_lock_bh(&ifp->lock);
3421 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3422 ifp->tstamp = jiffies;
3423 ifp->valid_lft = valid_lft;
3424 ifp->prefered_lft = prefered_lft;
3425
3426 spin_unlock_bh(&ifp->lock);
3427 if (!(ifp->flags&IFA_F_TENTATIVE))
3428 ipv6_ifa_notify(0, ifp);
3429
3430 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3431 expires, flags);
3432 addrconf_verify(0);
3433
3434 return 0;
3435 }
3436
3437 static int
3438 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3439 {
3440 struct net *net = sock_net(skb->sk);
3441 struct ifaddrmsg *ifm;
3442 struct nlattr *tb[IFA_MAX+1];
3443 struct in6_addr *pfx;
3444 struct inet6_ifaddr *ifa;
3445 struct net_device *dev;
3446 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3447 u8 ifa_flags;
3448 int err;
3449
3450 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3451 if (err < 0)
3452 return err;
3453
3454 ifm = nlmsg_data(nlh);
3455 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3456 if (pfx == NULL)
3457 return -EINVAL;
3458
3459 if (tb[IFA_CACHEINFO]) {
3460 struct ifa_cacheinfo *ci;
3461
3462 ci = nla_data(tb[IFA_CACHEINFO]);
3463 valid_lft = ci->ifa_valid;
3464 preferred_lft = ci->ifa_prefered;
3465 } else {
3466 preferred_lft = INFINITY_LIFE_TIME;
3467 valid_lft = INFINITY_LIFE_TIME;
3468 }
3469
3470 dev = __dev_get_by_index(net, ifm->ifa_index);
3471 if (dev == NULL)
3472 return -ENODEV;
3473
3474 /* We ignore other flags so far. */
3475 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3476
3477 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3478 if (ifa == NULL) {
3479 /*
3480 * It would be best to check for !NLM_F_CREATE here but
3481 * userspace alreay relies on not having to provide this.
3482 */
3483 return inet6_addr_add(net, ifm->ifa_index, pfx,
3484 ifm->ifa_prefixlen, ifa_flags,
3485 preferred_lft, valid_lft);
3486 }
3487
3488 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3489 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3490 err = -EEXIST;
3491 else
3492 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3493
3494 in6_ifa_put(ifa);
3495
3496 return err;
3497 }
3498
3499 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3500 u8 scope, int ifindex)
3501 {
3502 struct ifaddrmsg *ifm;
3503
3504 ifm = nlmsg_data(nlh);
3505 ifm->ifa_family = AF_INET6;
3506 ifm->ifa_prefixlen = prefixlen;
3507 ifm->ifa_flags = flags;
3508 ifm->ifa_scope = scope;
3509 ifm->ifa_index = ifindex;
3510 }
3511
3512 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3513 unsigned long tstamp, u32 preferred, u32 valid)
3514 {
3515 struct ifa_cacheinfo ci;
3516
3517 ci.cstamp = cstamp_delta(cstamp);
3518 ci.tstamp = cstamp_delta(tstamp);
3519 ci.ifa_prefered = preferred;
3520 ci.ifa_valid = valid;
3521
3522 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3523 }
3524
3525 static inline int rt_scope(int ifa_scope)
3526 {
3527 if (ifa_scope & IFA_HOST)
3528 return RT_SCOPE_HOST;
3529 else if (ifa_scope & IFA_LINK)
3530 return RT_SCOPE_LINK;
3531 else if (ifa_scope & IFA_SITE)
3532 return RT_SCOPE_SITE;
3533 else
3534 return RT_SCOPE_UNIVERSE;
3535 }
3536
3537 static inline int inet6_ifaddr_msgsize(void)
3538 {
3539 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3540 + nla_total_size(16) /* IFA_ADDRESS */
3541 + nla_total_size(sizeof(struct ifa_cacheinfo));
3542 }
3543
3544 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3545 u32 pid, u32 seq, int event, unsigned int flags)
3546 {
3547 struct nlmsghdr *nlh;
3548 u32 preferred, valid;
3549
3550 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3551 if (nlh == NULL)
3552 return -EMSGSIZE;
3553
3554 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3555 ifa->idev->dev->ifindex);
3556
3557 if (!(ifa->flags&IFA_F_PERMANENT)) {
3558 preferred = ifa->prefered_lft;
3559 valid = ifa->valid_lft;
3560 if (preferred != INFINITY_LIFE_TIME) {
3561 long tval = (jiffies - ifa->tstamp)/HZ;
3562 if (preferred > tval)
3563 preferred -= tval;
3564 else
3565 preferred = 0;
3566 if (valid != INFINITY_LIFE_TIME) {
3567 if (valid > tval)
3568 valid -= tval;
3569 else
3570 valid = 0;
3571 }
3572 }
3573 } else {
3574 preferred = INFINITY_LIFE_TIME;
3575 valid = INFINITY_LIFE_TIME;
3576 }
3577
3578 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3579 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3580 nlmsg_cancel(skb, nlh);
3581 return -EMSGSIZE;
3582 }
3583
3584 return nlmsg_end(skb, nlh);
3585 }
3586
3587 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3588 u32 pid, u32 seq, int event, u16 flags)
3589 {
3590 struct nlmsghdr *nlh;
3591 u8 scope = RT_SCOPE_UNIVERSE;
3592 int ifindex = ifmca->idev->dev->ifindex;
3593
3594 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3595 scope = RT_SCOPE_SITE;
3596
3597 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3598 if (nlh == NULL)
3599 return -EMSGSIZE;
3600
3601 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3602 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3603 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3604 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3605 nlmsg_cancel(skb, nlh);
3606 return -EMSGSIZE;
3607 }
3608
3609 return nlmsg_end(skb, nlh);
3610 }
3611
3612 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3613 u32 pid, u32 seq, int event, unsigned int flags)
3614 {
3615 struct nlmsghdr *nlh;
3616 u8 scope = RT_SCOPE_UNIVERSE;
3617 int ifindex = ifaca->aca_idev->dev->ifindex;
3618
3619 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3620 scope = RT_SCOPE_SITE;
3621
3622 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3623 if (nlh == NULL)
3624 return -EMSGSIZE;
3625
3626 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3627 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3628 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3629 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3630 nlmsg_cancel(skb, nlh);
3631 return -EMSGSIZE;
3632 }
3633
3634 return nlmsg_end(skb, nlh);
3635 }
3636
3637 enum addr_type_t {
3638 UNICAST_ADDR,
3639 MULTICAST_ADDR,
3640 ANYCAST_ADDR,
3641 };
3642
3643 /* called with rcu_read_lock() */
3644 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3645 struct netlink_callback *cb, enum addr_type_t type,
3646 int s_ip_idx, int *p_ip_idx)
3647 {
3648 struct ifmcaddr6 *ifmca;
3649 struct ifacaddr6 *ifaca;
3650 int err = 1;
3651 int ip_idx = *p_ip_idx;
3652
3653 read_lock_bh(&idev->lock);
3654 switch (type) {
3655 case UNICAST_ADDR: {
3656 struct inet6_ifaddr *ifa;
3657
3658 /* unicast address incl. temp addr */
3659 list_for_each_entry(ifa, &idev->addr_list, if_list) {
3660 if (++ip_idx < s_ip_idx)
3661 continue;
3662 err = inet6_fill_ifaddr(skb, ifa,
3663 NETLINK_CB(cb->skb).pid,
3664 cb->nlh->nlmsg_seq,
3665 RTM_NEWADDR,
3666 NLM_F_MULTI);
3667 if (err <= 0)
3668 break;
3669 }
3670 break;
3671 }
3672 case MULTICAST_ADDR:
3673 /* multicast address */
3674 for (ifmca = idev->mc_list; ifmca;
3675 ifmca = ifmca->next, ip_idx++) {
3676 if (ip_idx < s_ip_idx)
3677 continue;
3678 err = inet6_fill_ifmcaddr(skb, ifmca,
3679 NETLINK_CB(cb->skb).pid,
3680 cb->nlh->nlmsg_seq,
3681 RTM_GETMULTICAST,
3682 NLM_F_MULTI);
3683 if (err <= 0)
3684 break;
3685 }
3686 break;
3687 case ANYCAST_ADDR:
3688 /* anycast address */
3689 for (ifaca = idev->ac_list; ifaca;
3690 ifaca = ifaca->aca_next, ip_idx++) {
3691 if (ip_idx < s_ip_idx)
3692 continue;
3693 err = inet6_fill_ifacaddr(skb, ifaca,
3694 NETLINK_CB(cb->skb).pid,
3695 cb->nlh->nlmsg_seq,
3696 RTM_GETANYCAST,
3697 NLM_F_MULTI);
3698 if (err <= 0)
3699 break;
3700 }
3701 break;
3702 default:
3703 break;
3704 }
3705 read_unlock_bh(&idev->lock);
3706 *p_ip_idx = ip_idx;
3707 return err;
3708 }
3709
3710 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3711 enum addr_type_t type)
3712 {
3713 struct net *net = sock_net(skb->sk);
3714 int h, s_h;
3715 int idx, ip_idx;
3716 int s_idx, s_ip_idx;
3717 struct net_device *dev;
3718 struct inet6_dev *idev;
3719 struct hlist_head *head;
3720 struct hlist_node *node;
3721
3722 s_h = cb->args[0];
3723 s_idx = idx = cb->args[1];
3724 s_ip_idx = ip_idx = cb->args[2];
3725
3726 rcu_read_lock();
3727 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3728 idx = 0;
3729 head = &net->dev_index_head[h];
3730 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3731 if (idx < s_idx)
3732 goto cont;
3733 if (h > s_h || idx > s_idx)
3734 s_ip_idx = 0;
3735 ip_idx = 0;
3736 idev = __in6_dev_get(dev);
3737 if (!idev)
3738 goto cont;
3739
3740 if (in6_dump_addrs(idev, skb, cb, type,
3741 s_ip_idx, &ip_idx) <= 0)
3742 goto done;
3743 cont:
3744 idx++;
3745 }
3746 }
3747 done:
3748 rcu_read_unlock();
3749 cb->args[0] = h;
3750 cb->args[1] = idx;
3751 cb->args[2] = ip_idx;
3752
3753 return skb->len;
3754 }
3755
3756 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3757 {
3758 enum addr_type_t type = UNICAST_ADDR;
3759
3760 return inet6_dump_addr(skb, cb, type);
3761 }
3762
3763 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3764 {
3765 enum addr_type_t type = MULTICAST_ADDR;
3766
3767 return inet6_dump_addr(skb, cb, type);
3768 }
3769
3770
3771 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3772 {
3773 enum addr_type_t type = ANYCAST_ADDR;
3774
3775 return inet6_dump_addr(skb, cb, type);
3776 }
3777
3778 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3779 void *arg)
3780 {
3781 struct net *net = sock_net(in_skb->sk);
3782 struct ifaddrmsg *ifm;
3783 struct nlattr *tb[IFA_MAX+1];
3784 struct in6_addr *addr = NULL;
3785 struct net_device *dev = NULL;
3786 struct inet6_ifaddr *ifa;
3787 struct sk_buff *skb;
3788 int err;
3789
3790 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3791 if (err < 0)
3792 goto errout;
3793
3794 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3795 if (addr == NULL) {
3796 err = -EINVAL;
3797 goto errout;
3798 }
3799
3800 ifm = nlmsg_data(nlh);
3801 if (ifm->ifa_index)
3802 dev = __dev_get_by_index(net, ifm->ifa_index);
3803
3804 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
3805 if (!ifa) {
3806 err = -EADDRNOTAVAIL;
3807 goto errout;
3808 }
3809
3810 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
3811 if (!skb) {
3812 err = -ENOBUFS;
3813 goto errout_ifa;
3814 }
3815
3816 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3817 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3818 if (err < 0) {
3819 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3820 WARN_ON(err == -EMSGSIZE);
3821 kfree_skb(skb);
3822 goto errout_ifa;
3823 }
3824 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
3825 errout_ifa:
3826 in6_ifa_put(ifa);
3827 errout:
3828 return err;
3829 }
3830
3831 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3832 {
3833 struct sk_buff *skb;
3834 struct net *net = dev_net(ifa->idev->dev);
3835 int err = -ENOBUFS;
3836
3837 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3838 if (skb == NULL)
3839 goto errout;
3840
3841 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3842 if (err < 0) {
3843 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3844 WARN_ON(err == -EMSGSIZE);
3845 kfree_skb(skb);
3846 goto errout;
3847 }
3848 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3849 return;
3850 errout:
3851 if (err < 0)
3852 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3853 }
3854
3855 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3856 __s32 *array, int bytes)
3857 {
3858 BUG_ON(bytes < (DEVCONF_MAX * 4));
3859
3860 memset(array, 0, bytes);
3861 array[DEVCONF_FORWARDING] = cnf->forwarding;
3862 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3863 array[DEVCONF_MTU6] = cnf->mtu6;
3864 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3865 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3866 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3867 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3868 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3869 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
3870 jiffies_to_msecs(cnf->rtr_solicit_interval);
3871 array[DEVCONF_RTR_SOLICIT_DELAY] =
3872 jiffies_to_msecs(cnf->rtr_solicit_delay);
3873 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3874 #ifdef CONFIG_IPV6_PRIVACY
3875 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3876 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3877 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3878 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3879 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3880 #endif
3881 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3882 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3883 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3884 #ifdef CONFIG_IPV6_ROUTER_PREF
3885 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3886 array[DEVCONF_RTR_PROBE_INTERVAL] =
3887 jiffies_to_msecs(cnf->rtr_probe_interval);
3888 #ifdef CONFIG_IPV6_ROUTE_INFO
3889 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3890 #endif
3891 #endif
3892 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3893 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3894 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3895 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3896 #endif
3897 #ifdef CONFIG_IPV6_MROUTE
3898 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
3899 #endif
3900 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
3901 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
3902 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
3903 }
3904
3905 static inline size_t inet6_ifla6_size(void)
3906 {
3907 return nla_total_size(4) /* IFLA_INET6_FLAGS */
3908 + nla_total_size(sizeof(struct ifla_cacheinfo))
3909 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3910 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3911 + nla_total_size(ICMP6_MIB_MAX * 8); /* IFLA_INET6_ICMP6STATS */
3912 }
3913
3914 static inline size_t inet6_if_nlmsg_size(void)
3915 {
3916 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3917 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3918 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3919 + nla_total_size(4) /* IFLA_MTU */
3920 + nla_total_size(4) /* IFLA_LINK */
3921 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
3922 }
3923
3924 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
3925 int items, int bytes)
3926 {
3927 int i;
3928 int pad = bytes - sizeof(u64) * items;
3929 BUG_ON(pad < 0);
3930
3931 /* Use put_unaligned() because stats may not be aligned for u64. */
3932 put_unaligned(items, &stats[0]);
3933 for (i = 1; i < items; i++)
3934 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
3935
3936 memset(&stats[items], 0, pad);
3937 }
3938
3939 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib,
3940 int items, int bytes, size_t syncpoff)
3941 {
3942 int i;
3943 int pad = bytes - sizeof(u64) * items;
3944 BUG_ON(pad < 0);
3945
3946 /* Use put_unaligned() because stats may not be aligned for u64. */
3947 put_unaligned(items, &stats[0]);
3948 for (i = 1; i < items; i++)
3949 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
3950
3951 memset(&stats[items], 0, pad);
3952 }
3953
3954 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3955 int bytes)
3956 {
3957 switch (attrtype) {
3958 case IFLA_INET6_STATS:
3959 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6,
3960 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
3961 break;
3962 case IFLA_INET6_ICMP6STATS:
3963 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
3964 break;
3965 }
3966 }
3967
3968 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
3969 {
3970 struct nlattr *nla;
3971 struct ifla_cacheinfo ci;
3972
3973 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
3974
3975 ci.max_reasm_len = IPV6_MAXPLEN;
3976 ci.tstamp = cstamp_delta(idev->tstamp);
3977 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
3978 ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time);
3979 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3980
3981 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3982 if (nla == NULL)
3983 goto nla_put_failure;
3984 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
3985
3986 /* XXX - MC not implemented */
3987
3988 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3989 if (nla == NULL)
3990 goto nla_put_failure;
3991 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3992
3993 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3994 if (nla == NULL)
3995 goto nla_put_failure;
3996 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
3997
3998 return 0;
3999
4000 nla_put_failure:
4001 return -EMSGSIZE;
4002 }
4003
4004 static size_t inet6_get_link_af_size(const struct net_device *dev)
4005 {
4006 if (!__in6_dev_get(dev))
4007 return 0;
4008
4009 return inet6_ifla6_size();
4010 }
4011
4012 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
4013 {
4014 struct inet6_dev *idev = __in6_dev_get(dev);
4015
4016 if (!idev)
4017 return -ENODATA;
4018
4019 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4020 return -EMSGSIZE;
4021
4022 return 0;
4023 }
4024
4025 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
4026 u32 pid, u32 seq, int event, unsigned int flags)
4027 {
4028 struct net_device *dev = idev->dev;
4029 struct ifinfomsg *hdr;
4030 struct nlmsghdr *nlh;
4031 void *protoinfo;
4032
4033 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
4034 if (nlh == NULL)
4035 return -EMSGSIZE;
4036
4037 hdr = nlmsg_data(nlh);
4038 hdr->ifi_family = AF_INET6;
4039 hdr->__ifi_pad = 0;
4040 hdr->ifi_type = dev->type;
4041 hdr->ifi_index = dev->ifindex;
4042 hdr->ifi_flags = dev_get_flags(dev);
4043 hdr->ifi_change = 0;
4044
4045 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
4046
4047 if (dev->addr_len)
4048 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
4049
4050 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
4051 if (dev->ifindex != dev->iflink)
4052 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
4053
4054 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4055 if (protoinfo == NULL)
4056 goto nla_put_failure;
4057
4058 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4059 goto nla_put_failure;
4060
4061 nla_nest_end(skb, protoinfo);
4062 return nlmsg_end(skb, nlh);
4063
4064 nla_put_failure:
4065 nlmsg_cancel(skb, nlh);
4066 return -EMSGSIZE;
4067 }
4068
4069 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4070 {
4071 struct net *net = sock_net(skb->sk);
4072 int h, s_h;
4073 int idx = 0, s_idx;
4074 struct net_device *dev;
4075 struct inet6_dev *idev;
4076 struct hlist_head *head;
4077 struct hlist_node *node;
4078
4079 s_h = cb->args[0];
4080 s_idx = cb->args[1];
4081
4082 rcu_read_lock();
4083 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4084 idx = 0;
4085 head = &net->dev_index_head[h];
4086 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
4087 if (idx < s_idx)
4088 goto cont;
4089 idev = __in6_dev_get(dev);
4090 if (!idev)
4091 goto cont;
4092 if (inet6_fill_ifinfo(skb, idev,
4093 NETLINK_CB(cb->skb).pid,
4094 cb->nlh->nlmsg_seq,
4095 RTM_NEWLINK, NLM_F_MULTI) <= 0)
4096 goto out;
4097 cont:
4098 idx++;
4099 }
4100 }
4101 out:
4102 rcu_read_unlock();
4103 cb->args[1] = idx;
4104 cb->args[0] = h;
4105
4106 return skb->len;
4107 }
4108
4109 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4110 {
4111 struct sk_buff *skb;
4112 struct net *net = dev_net(idev->dev);
4113 int err = -ENOBUFS;
4114
4115 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
4116 if (skb == NULL)
4117 goto errout;
4118
4119 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
4120 if (err < 0) {
4121 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4122 WARN_ON(err == -EMSGSIZE);
4123 kfree_skb(skb);
4124 goto errout;
4125 }
4126 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
4127 return;
4128 errout:
4129 if (err < 0)
4130 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
4131 }
4132
4133 static inline size_t inet6_prefix_nlmsg_size(void)
4134 {
4135 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4136 + nla_total_size(sizeof(struct in6_addr))
4137 + nla_total_size(sizeof(struct prefix_cacheinfo));
4138 }
4139
4140 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
4141 struct prefix_info *pinfo, u32 pid, u32 seq,
4142 int event, unsigned int flags)
4143 {
4144 struct prefixmsg *pmsg;
4145 struct nlmsghdr *nlh;
4146 struct prefix_cacheinfo ci;
4147
4148 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
4149 if (nlh == NULL)
4150 return -EMSGSIZE;
4151
4152 pmsg = nlmsg_data(nlh);
4153 pmsg->prefix_family = AF_INET6;
4154 pmsg->prefix_pad1 = 0;
4155 pmsg->prefix_pad2 = 0;
4156 pmsg->prefix_ifindex = idev->dev->ifindex;
4157 pmsg->prefix_len = pinfo->prefix_len;
4158 pmsg->prefix_type = pinfo->type;
4159 pmsg->prefix_pad3 = 0;
4160 pmsg->prefix_flags = 0;
4161 if (pinfo->onlink)
4162 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4163 if (pinfo->autoconf)
4164 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4165
4166 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
4167
4168 ci.preferred_time = ntohl(pinfo->prefered);
4169 ci.valid_time = ntohl(pinfo->valid);
4170 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
4171
4172 return nlmsg_end(skb, nlh);
4173
4174 nla_put_failure:
4175 nlmsg_cancel(skb, nlh);
4176 return -EMSGSIZE;
4177 }
4178
4179 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
4180 struct prefix_info *pinfo)
4181 {
4182 struct sk_buff *skb;
4183 struct net *net = dev_net(idev->dev);
4184 int err = -ENOBUFS;
4185
4186 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
4187 if (skb == NULL)
4188 goto errout;
4189
4190 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
4191 if (err < 0) {
4192 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4193 WARN_ON(err == -EMSGSIZE);
4194 kfree_skb(skb);
4195 goto errout;
4196 }
4197 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4198 return;
4199 errout:
4200 if (err < 0)
4201 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
4202 }
4203
4204 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4205 {
4206 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4207
4208 switch (event) {
4209 case RTM_NEWADDR:
4210 /*
4211 * If the address was optimistic
4212 * we inserted the route at the start of
4213 * our DAD process, so we don't need
4214 * to do it again
4215 */
4216 if (!(ifp->rt->rt6i_node))
4217 ip6_ins_rt(ifp->rt);
4218 if (ifp->idev->cnf.forwarding)
4219 addrconf_join_anycast(ifp);
4220 break;
4221 case RTM_DELADDR:
4222 if (ifp->idev->cnf.forwarding)
4223 addrconf_leave_anycast(ifp);
4224 addrconf_leave_solict(ifp->idev, &ifp->addr);
4225 dst_hold(&ifp->rt->dst);
4226
4227 if (ip6_del_rt(ifp->rt))
4228 dst_free(&ifp->rt->dst);
4229 break;
4230 }
4231 }
4232
4233 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4234 {
4235 rcu_read_lock_bh();
4236 if (likely(ifp->idev->dead == 0))
4237 __ipv6_ifa_notify(event, ifp);
4238 rcu_read_unlock_bh();
4239 }
4240
4241 #ifdef CONFIG_SYSCTL
4242
4243 static
4244 int addrconf_sysctl_forward(ctl_table *ctl, int write,
4245 void __user *buffer, size_t *lenp, loff_t *ppos)
4246 {
4247 int *valp = ctl->data;
4248 int val = *valp;
4249 loff_t pos = *ppos;
4250 int ret;
4251
4252 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
4253
4254 if (write)
4255 ret = addrconf_fixup_forwarding(ctl, valp, val);
4256 if (ret)
4257 *ppos = pos;
4258 return ret;
4259 }
4260
4261 static void dev_disable_change(struct inet6_dev *idev)
4262 {
4263 if (!idev || !idev->dev)
4264 return;
4265
4266 if (idev->cnf.disable_ipv6)
4267 addrconf_notify(NULL, NETDEV_DOWN, idev->dev);
4268 else
4269 addrconf_notify(NULL, NETDEV_UP, idev->dev);
4270 }
4271
4272 static void addrconf_disable_change(struct net *net, __s32 newf)
4273 {
4274 struct net_device *dev;
4275 struct inet6_dev *idev;
4276
4277 rcu_read_lock();
4278 for_each_netdev_rcu(net, dev) {
4279 idev = __in6_dev_get(dev);
4280 if (idev) {
4281 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4282 idev->cnf.disable_ipv6 = newf;
4283 if (changed)
4284 dev_disable_change(idev);
4285 }
4286 }
4287 rcu_read_unlock();
4288 }
4289
4290 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int old)
4291 {
4292 struct net *net;
4293
4294 net = (struct net *)table->extra2;
4295
4296 if (p == &net->ipv6.devconf_dflt->disable_ipv6)
4297 return 0;
4298
4299 if (!rtnl_trylock()) {
4300 /* Restore the original values before restarting */
4301 *p = old;
4302 return restart_syscall();
4303 }
4304
4305 if (p == &net->ipv6.devconf_all->disable_ipv6) {
4306 __s32 newf = net->ipv6.devconf_all->disable_ipv6;
4307 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4308 addrconf_disable_change(net, newf);
4309 } else if ((!*p) ^ (!old))
4310 dev_disable_change((struct inet6_dev *)table->extra1);
4311
4312 rtnl_unlock();
4313 return 0;
4314 }
4315
4316 static
4317 int addrconf_sysctl_disable(ctl_table *ctl, int write,
4318 void __user *buffer, size_t *lenp, loff_t *ppos)
4319 {
4320 int *valp = ctl->data;
4321 int val = *valp;
4322 loff_t pos = *ppos;
4323 int ret;
4324
4325 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
4326
4327 if (write)
4328 ret = addrconf_disable_ipv6(ctl, valp, val);
4329 if (ret)
4330 *ppos = pos;
4331 return ret;
4332 }
4333
4334 static struct addrconf_sysctl_table
4335 {
4336 struct ctl_table_header *sysctl_header;
4337 ctl_table addrconf_vars[DEVCONF_MAX+1];
4338 char *dev_name;
4339 } addrconf_sysctl __read_mostly = {
4340 .sysctl_header = NULL,
4341 .addrconf_vars = {
4342 {
4343 .procname = "forwarding",
4344 .data = &ipv6_devconf.forwarding,
4345 .maxlen = sizeof(int),
4346 .mode = 0644,
4347 .proc_handler = addrconf_sysctl_forward,
4348 },
4349 {
4350 .procname = "hop_limit",
4351 .data = &ipv6_devconf.hop_limit,
4352 .maxlen = sizeof(int),
4353 .mode = 0644,
4354 .proc_handler = proc_dointvec,
4355 },
4356 {
4357 .procname = "mtu",
4358 .data = &ipv6_devconf.mtu6,
4359 .maxlen = sizeof(int),
4360 .mode = 0644,
4361 .proc_handler = proc_dointvec,
4362 },
4363 {
4364 .procname = "accept_ra",
4365 .data = &ipv6_devconf.accept_ra,
4366 .maxlen = sizeof(int),
4367 .mode = 0644,
4368 .proc_handler = proc_dointvec,
4369 },
4370 {
4371 .procname = "accept_redirects",
4372 .data = &ipv6_devconf.accept_redirects,
4373 .maxlen = sizeof(int),
4374 .mode = 0644,
4375 .proc_handler = proc_dointvec,
4376 },
4377 {
4378 .procname = "autoconf",
4379 .data = &ipv6_devconf.autoconf,
4380 .maxlen = sizeof(int),
4381 .mode = 0644,
4382 .proc_handler = proc_dointvec,
4383 },
4384 {
4385 .procname = "dad_transmits",
4386 .data = &ipv6_devconf.dad_transmits,
4387 .maxlen = sizeof(int),
4388 .mode = 0644,
4389 .proc_handler = proc_dointvec,
4390 },
4391 {
4392 .procname = "router_solicitations",
4393 .data = &ipv6_devconf.rtr_solicits,
4394 .maxlen = sizeof(int),
4395 .mode = 0644,
4396 .proc_handler = proc_dointvec,
4397 },
4398 {
4399 .procname = "router_solicitation_interval",
4400 .data = &ipv6_devconf.rtr_solicit_interval,
4401 .maxlen = sizeof(int),
4402 .mode = 0644,
4403 .proc_handler = proc_dointvec_jiffies,
4404 },
4405 {
4406 .procname = "router_solicitation_delay",
4407 .data = &ipv6_devconf.rtr_solicit_delay,
4408 .maxlen = sizeof(int),
4409 .mode = 0644,
4410 .proc_handler = proc_dointvec_jiffies,
4411 },
4412 {
4413 .procname = "force_mld_version",
4414 .data = &ipv6_devconf.force_mld_version,
4415 .maxlen = sizeof(int),
4416 .mode = 0644,
4417 .proc_handler = proc_dointvec,
4418 },
4419 #ifdef CONFIG_IPV6_PRIVACY
4420 {
4421 .procname = "use_tempaddr",
4422 .data = &ipv6_devconf.use_tempaddr,
4423 .maxlen = sizeof(int),
4424 .mode = 0644,
4425 .proc_handler = proc_dointvec,
4426 },
4427 {
4428 .procname = "temp_valid_lft",
4429 .data = &ipv6_devconf.temp_valid_lft,
4430 .maxlen = sizeof(int),
4431 .mode = 0644,
4432 .proc_handler = proc_dointvec,
4433 },
4434 {
4435 .procname = "temp_prefered_lft",
4436 .data = &ipv6_devconf.temp_prefered_lft,
4437 .maxlen = sizeof(int),
4438 .mode = 0644,
4439 .proc_handler = proc_dointvec,
4440 },
4441 {
4442 .procname = "regen_max_retry",
4443 .data = &ipv6_devconf.regen_max_retry,
4444 .maxlen = sizeof(int),
4445 .mode = 0644,
4446 .proc_handler = proc_dointvec,
4447 },
4448 {
4449 .procname = "max_desync_factor",
4450 .data = &ipv6_devconf.max_desync_factor,
4451 .maxlen = sizeof(int),
4452 .mode = 0644,
4453 .proc_handler = proc_dointvec,
4454 },
4455 #endif
4456 {
4457 .procname = "max_addresses",
4458 .data = &ipv6_devconf.max_addresses,
4459 .maxlen = sizeof(int),
4460 .mode = 0644,
4461 .proc_handler = proc_dointvec,
4462 },
4463 {
4464 .procname = "accept_ra_defrtr",
4465 .data = &ipv6_devconf.accept_ra_defrtr,
4466 .maxlen = sizeof(int),
4467 .mode = 0644,
4468 .proc_handler = proc_dointvec,
4469 },
4470 {
4471 .procname = "accept_ra_pinfo",
4472 .data = &ipv6_devconf.accept_ra_pinfo,
4473 .maxlen = sizeof(int),
4474 .mode = 0644,
4475 .proc_handler = proc_dointvec,
4476 },
4477 #ifdef CONFIG_IPV6_ROUTER_PREF
4478 {
4479 .procname = "accept_ra_rtr_pref",
4480 .data = &ipv6_devconf.accept_ra_rtr_pref,
4481 .maxlen = sizeof(int),
4482 .mode = 0644,
4483 .proc_handler = proc_dointvec,
4484 },
4485 {
4486 .procname = "router_probe_interval",
4487 .data = &ipv6_devconf.rtr_probe_interval,
4488 .maxlen = sizeof(int),
4489 .mode = 0644,
4490 .proc_handler = proc_dointvec_jiffies,
4491 },
4492 #ifdef CONFIG_IPV6_ROUTE_INFO
4493 {
4494 .procname = "accept_ra_rt_info_max_plen",
4495 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4496 .maxlen = sizeof(int),
4497 .mode = 0644,
4498 .proc_handler = proc_dointvec,
4499 },
4500 #endif
4501 #endif
4502 {
4503 .procname = "proxy_ndp",
4504 .data = &ipv6_devconf.proxy_ndp,
4505 .maxlen = sizeof(int),
4506 .mode = 0644,
4507 .proc_handler = proc_dointvec,
4508 },
4509 {
4510 .procname = "accept_source_route",
4511 .data = &ipv6_devconf.accept_source_route,
4512 .maxlen = sizeof(int),
4513 .mode = 0644,
4514 .proc_handler = proc_dointvec,
4515 },
4516 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4517 {
4518 .procname = "optimistic_dad",
4519 .data = &ipv6_devconf.optimistic_dad,
4520 .maxlen = sizeof(int),
4521 .mode = 0644,
4522 .proc_handler = proc_dointvec,
4523
4524 },
4525 #endif
4526 #ifdef CONFIG_IPV6_MROUTE
4527 {
4528 .procname = "mc_forwarding",
4529 .data = &ipv6_devconf.mc_forwarding,
4530 .maxlen = sizeof(int),
4531 .mode = 0444,
4532 .proc_handler = proc_dointvec,
4533 },
4534 #endif
4535 {
4536 .procname = "disable_ipv6",
4537 .data = &ipv6_devconf.disable_ipv6,
4538 .maxlen = sizeof(int),
4539 .mode = 0644,
4540 .proc_handler = addrconf_sysctl_disable,
4541 },
4542 {
4543 .procname = "accept_dad",
4544 .data = &ipv6_devconf.accept_dad,
4545 .maxlen = sizeof(int),
4546 .mode = 0644,
4547 .proc_handler = proc_dointvec,
4548 },
4549 {
4550 .procname = "force_tllao",
4551 .data = &ipv6_devconf.force_tllao,
4552 .maxlen = sizeof(int),
4553 .mode = 0644,
4554 .proc_handler = proc_dointvec
4555 },
4556 {
4557 /* sentinel */
4558 }
4559 },
4560 };
4561
4562 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4563 struct inet6_dev *idev, struct ipv6_devconf *p)
4564 {
4565 int i;
4566 struct addrconf_sysctl_table *t;
4567
4568 #define ADDRCONF_CTL_PATH_DEV 3
4569
4570 struct ctl_path addrconf_ctl_path[] = {
4571 { .procname = "net", },
4572 { .procname = "ipv6", },
4573 { .procname = "conf", },
4574 { /* to be set */ },
4575 { },
4576 };
4577
4578
4579 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4580 if (t == NULL)
4581 goto out;
4582
4583 for (i = 0; t->addrconf_vars[i].data; i++) {
4584 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
4585 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4586 t->addrconf_vars[i].extra2 = net;
4587 }
4588
4589 /*
4590 * Make a copy of dev_name, because '.procname' is regarded as const
4591 * by sysctl and we wouldn't want anyone to change it under our feet
4592 * (see SIOCSIFNAME).
4593 */
4594 t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4595 if (!t->dev_name)
4596 goto free;
4597
4598 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
4599
4600 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
4601 t->addrconf_vars);
4602 if (t->sysctl_header == NULL)
4603 goto free_procname;
4604
4605 p->sysctl = t;
4606 return 0;
4607
4608 free_procname:
4609 kfree(t->dev_name);
4610 free:
4611 kfree(t);
4612 out:
4613 return -ENOBUFS;
4614 }
4615
4616 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4617 {
4618 struct addrconf_sysctl_table *t;
4619
4620 if (p->sysctl == NULL)
4621 return;
4622
4623 t = p->sysctl;
4624 p->sysctl = NULL;
4625 unregister_net_sysctl_table(t->sysctl_header);
4626 kfree(t->dev_name);
4627 kfree(t);
4628 }
4629
4630 static void addrconf_sysctl_register(struct inet6_dev *idev)
4631 {
4632 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
4633 &ndisc_ifinfo_sysctl_change);
4634 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
4635 idev, &idev->cnf);
4636 }
4637
4638 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
4639 {
4640 __addrconf_sysctl_unregister(&idev->cnf);
4641 neigh_sysctl_unregister(idev->nd_parms);
4642 }
4643
4644
4645 #endif
4646
4647 static int __net_init addrconf_init_net(struct net *net)
4648 {
4649 int err;
4650 struct ipv6_devconf *all, *dflt;
4651
4652 err = -ENOMEM;
4653 all = &ipv6_devconf;
4654 dflt = &ipv6_devconf_dflt;
4655
4656 if (!net_eq(net, &init_net)) {
4657 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4658 if (all == NULL)
4659 goto err_alloc_all;
4660
4661 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4662 if (dflt == NULL)
4663 goto err_alloc_dflt;
4664 } else {
4665 /* these will be inherited by all namespaces */
4666 dflt->autoconf = ipv6_defaults.autoconf;
4667 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
4668 }
4669
4670 net->ipv6.devconf_all = all;
4671 net->ipv6.devconf_dflt = dflt;
4672
4673 #ifdef CONFIG_SYSCTL
4674 err = __addrconf_sysctl_register(net, "all", NULL, all);
4675 if (err < 0)
4676 goto err_reg_all;
4677
4678 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
4679 if (err < 0)
4680 goto err_reg_dflt;
4681 #endif
4682 return 0;
4683
4684 #ifdef CONFIG_SYSCTL
4685 err_reg_dflt:
4686 __addrconf_sysctl_unregister(all);
4687 err_reg_all:
4688 kfree(dflt);
4689 #endif
4690 err_alloc_dflt:
4691 kfree(all);
4692 err_alloc_all:
4693 return err;
4694 }
4695
4696 static void __net_exit addrconf_exit_net(struct net *net)
4697 {
4698 #ifdef CONFIG_SYSCTL
4699 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4700 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4701 #endif
4702 if (!net_eq(net, &init_net)) {
4703 kfree(net->ipv6.devconf_dflt);
4704 kfree(net->ipv6.devconf_all);
4705 }
4706 }
4707
4708 static struct pernet_operations addrconf_ops = {
4709 .init = addrconf_init_net,
4710 .exit = addrconf_exit_net,
4711 };
4712
4713 /*
4714 * Device notifier
4715 */
4716
4717 int register_inet6addr_notifier(struct notifier_block *nb)
4718 {
4719 return atomic_notifier_chain_register(&inet6addr_chain, nb);
4720 }
4721 EXPORT_SYMBOL(register_inet6addr_notifier);
4722
4723 int unregister_inet6addr_notifier(struct notifier_block *nb)
4724 {
4725 return atomic_notifier_chain_unregister(&inet6addr_chain, nb);
4726 }
4727 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4728
4729 static struct rtnl_af_ops inet6_ops = {
4730 .family = AF_INET6,
4731 .fill_link_af = inet6_fill_link_af,
4732 .get_link_af_size = inet6_get_link_af_size,
4733 };
4734
4735 /*
4736 * Init / cleanup code
4737 */
4738
4739 int __init addrconf_init(void)
4740 {
4741 int i, err;
4742
4743 err = ipv6_addr_label_init();
4744 if (err < 0) {
4745 printk(KERN_CRIT "IPv6 Addrconf:"
4746 " cannot initialize default policy table: %d.\n", err);
4747 goto out;
4748 }
4749
4750 err = register_pernet_subsys(&addrconf_ops);
4751 if (err < 0)
4752 goto out_addrlabel;
4753
4754 /* The addrconf netdev notifier requires that loopback_dev
4755 * has it's ipv6 private information allocated and setup
4756 * before it can bring up and give link-local addresses
4757 * to other devices which are up.
4758 *
4759 * Unfortunately, loopback_dev is not necessarily the first
4760 * entry in the global dev_base list of net devices. In fact,
4761 * it is likely to be the very last entry on that list.
4762 * So this causes the notifier registry below to try and
4763 * give link-local addresses to all devices besides loopback_dev
4764 * first, then loopback_dev, which cases all the non-loopback_dev
4765 * devices to fail to get a link-local address.
4766 *
4767 * So, as a temporary fix, allocate the ipv6 structure for
4768 * loopback_dev first by hand.
4769 * Longer term, all of the dependencies ipv6 has upon the loopback
4770 * device and it being up should be removed.
4771 */
4772 rtnl_lock();
4773 if (!ipv6_add_dev(init_net.loopback_dev))
4774 err = -ENOMEM;
4775 rtnl_unlock();
4776 if (err)
4777 goto errlo;
4778
4779 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4780 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
4781
4782 register_netdevice_notifier(&ipv6_dev_notf);
4783
4784 addrconf_verify(0);
4785
4786 err = rtnl_af_register(&inet6_ops);
4787 if (err < 0)
4788 goto errout_af;
4789
4790 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
4791 NULL);
4792 if (err < 0)
4793 goto errout;
4794
4795 /* Only the first call to __rtnl_register can fail */
4796 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
4797 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
4798 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
4799 inet6_dump_ifaddr, NULL);
4800 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
4801 inet6_dump_ifmcaddr, NULL);
4802 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
4803 inet6_dump_ifacaddr, NULL);
4804
4805 ipv6_addr_label_rtnl_register();
4806
4807 return 0;
4808 errout:
4809 rtnl_af_unregister(&inet6_ops);
4810 errout_af:
4811 unregister_netdevice_notifier(&ipv6_dev_notf);
4812 errlo:
4813 unregister_pernet_subsys(&addrconf_ops);
4814 out_addrlabel:
4815 ipv6_addr_label_cleanup();
4816 out:
4817 return err;
4818 }
4819
4820 void addrconf_cleanup(void)
4821 {
4822 struct net_device *dev;
4823 int i;
4824
4825 unregister_netdevice_notifier(&ipv6_dev_notf);
4826 unregister_pernet_subsys(&addrconf_ops);
4827 ipv6_addr_label_cleanup();
4828
4829 rtnl_lock();
4830
4831 __rtnl_af_unregister(&inet6_ops);
4832
4833 /* clean dev list */
4834 for_each_netdev(&init_net, dev) {
4835 if (__in6_dev_get(dev) == NULL)
4836 continue;
4837 addrconf_ifdown(dev, 1);
4838 }
4839 addrconf_ifdown(init_net.loopback_dev, 2);
4840
4841 /*
4842 * Check hash table.
4843 */
4844 spin_lock_bh(&addrconf_hash_lock);
4845 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4846 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
4847 spin_unlock_bh(&addrconf_hash_lock);
4848
4849 del_timer(&addr_chk_timer);
4850 rtnl_unlock();
4851 }
Linux kernel - Deliverables
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