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ipv6: reallocate addrconf router for ipv6 address when lo device up
[linux/fpc-iii.git] / net / ipv6 / addrconf.c
blobbe5876079a8e73764d91afb81d37b3103259a2e3
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_assign_pointer(dev->ip6_ptr, ndev);
433
434 /* Join all-node multicast group */
435 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
436
437 /* Join all-router multicast group if forwarding is set */
438 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
439 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
440
441 return ndev;
442 }
443
444 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
445 {
446 struct inet6_dev *idev;
447
448 ASSERT_RTNL();
449
450 idev = __in6_dev_get(dev);
451 if (!idev) {
452 idev = ipv6_add_dev(dev);
453 if (!idev)
454 return NULL;
455 }
456
457 if (dev->flags&IFF_UP)
458 ipv6_mc_up(idev);
459 return idev;
460 }
461
462 #ifdef CONFIG_SYSCTL
463 static void dev_forward_change(struct inet6_dev *idev)
464 {
465 struct net_device *dev;
466 struct inet6_ifaddr *ifa;
467
468 if (!idev)
469 return;
470 dev = idev->dev;
471 if (idev->cnf.forwarding)
472 dev_disable_lro(dev);
473 if (dev && (dev->flags & IFF_MULTICAST)) {
474 if (idev->cnf.forwarding)
475 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
476 else
477 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
478 }
479
480 list_for_each_entry(ifa, &idev->addr_list, if_list) {
481 if (ifa->flags&IFA_F_TENTATIVE)
482 continue;
483 if (idev->cnf.forwarding)
484 addrconf_join_anycast(ifa);
485 else
486 addrconf_leave_anycast(ifa);
487 }
488 }
489
490
491 static void addrconf_forward_change(struct net *net, __s32 newf)
492 {
493 struct net_device *dev;
494 struct inet6_dev *idev;
495
496 for_each_netdev(net, dev) {
497 idev = __in6_dev_get(dev);
498 if (idev) {
499 int changed = (!idev->cnf.forwarding) ^ (!newf);
500 idev->cnf.forwarding = newf;
501 if (changed)
502 dev_forward_change(idev);
503 }
504 }
505 }
506
507 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
508 {
509 struct net *net;
510 int old;
511
512 if (!rtnl_trylock())
513 return restart_syscall();
514
515 net = (struct net *)table->extra2;
516 old = *p;
517 *p = newf;
518
519 if (p == &net->ipv6.devconf_dflt->forwarding) {
520 rtnl_unlock();
521 return 0;
522 }
523
524 if (p == &net->ipv6.devconf_all->forwarding) {
525 net->ipv6.devconf_dflt->forwarding = newf;
526 addrconf_forward_change(net, newf);
527 } else if ((!newf) ^ (!old))
528 dev_forward_change((struct inet6_dev *)table->extra1);
529 rtnl_unlock();
530
531 if (newf)
532 rt6_purge_dflt_routers(net);
533 return 1;
534 }
535 #endif
536
537 /* Nobody refers to this ifaddr, destroy it */
538 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
539 {
540 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
541
542 #ifdef NET_REFCNT_DEBUG
543 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
544 #endif
545
546 in6_dev_put(ifp->idev);
547
548 if (del_timer(&ifp->timer))
549 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp);
550
551 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
552 pr_warning("Freeing alive inet6 address %p\n", ifp);
553 return;
554 }
555 dst_release(&ifp->rt->dst);
556
557 kfree_rcu(ifp, rcu);
558 }
559
560 static void
561 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
562 {
563 struct list_head *p;
564 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
565
566 /*
567 * Each device address list is sorted in order of scope -
568 * global before linklocal.
569 */
570 list_for_each(p, &idev->addr_list) {
571 struct inet6_ifaddr *ifa
572 = list_entry(p, struct inet6_ifaddr, if_list);
573 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
574 break;
575 }
576
577 list_add_tail(&ifp->if_list, p);
578 }
579
580 static u32 ipv6_addr_hash(const struct in6_addr *addr)
581 {
582 /*
583 * We perform the hash function over the last 64 bits of the address
584 * This will include the IEEE address token on links that support it.
585 */
586 return jhash_2words((__force u32)addr->s6_addr32[2],
587 (__force u32)addr->s6_addr32[3], 0)
588 & (IN6_ADDR_HSIZE - 1);
589 }
590
591 /* On success it returns ifp with increased reference count */
592
593 static struct inet6_ifaddr *
594 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
595 int scope, u32 flags)
596 {
597 struct inet6_ifaddr *ifa = NULL;
598 struct rt6_info *rt;
599 unsigned int hash;
600 int err = 0;
601 int addr_type = ipv6_addr_type(addr);
602
603 if (addr_type == IPV6_ADDR_ANY ||
604 addr_type & IPV6_ADDR_MULTICAST ||
605 (!(idev->dev->flags & IFF_LOOPBACK) &&
606 addr_type & IPV6_ADDR_LOOPBACK))
607 return ERR_PTR(-EADDRNOTAVAIL);
608
609 rcu_read_lock_bh();
610 if (idev->dead) {
611 err = -ENODEV; /*XXX*/
612 goto out2;
613 }
614
615 if (idev->cnf.disable_ipv6) {
616 err = -EACCES;
617 goto out2;
618 }
619
620 spin_lock(&addrconf_hash_lock);
621
622 /* Ignore adding duplicate addresses on an interface */
623 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
624 ADBG(("ipv6_add_addr: already assigned\n"));
625 err = -EEXIST;
626 goto out;
627 }
628
629 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
630
631 if (ifa == NULL) {
632 ADBG(("ipv6_add_addr: malloc failed\n"));
633 err = -ENOBUFS;
634 goto out;
635 }
636
637 rt = addrconf_dst_alloc(idev, addr, false);
638 if (IS_ERR(rt)) {
639 err = PTR_ERR(rt);
640 goto out;
641 }
642
643 ifa->addr = *addr;
644
645 spin_lock_init(&ifa->lock);
646 spin_lock_init(&ifa->state_lock);
647 init_timer(&ifa->timer);
648 INIT_HLIST_NODE(&ifa->addr_lst);
649 ifa->timer.data = (unsigned long) ifa;
650 ifa->scope = scope;
651 ifa->prefix_len = pfxlen;
652 ifa->flags = flags | IFA_F_TENTATIVE;
653 ifa->cstamp = ifa->tstamp = jiffies;
654
655 ifa->rt = rt;
656
657 ifa->idev = idev;
658 in6_dev_hold(idev);
659 /* For caller */
660 in6_ifa_hold(ifa);
661
662 /* Add to big hash table */
663 hash = ipv6_addr_hash(addr);
664
665 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
666 spin_unlock(&addrconf_hash_lock);
667
668 write_lock(&idev->lock);
669 /* Add to inet6_dev unicast addr list. */
670 ipv6_link_dev_addr(idev, ifa);
671
672 #ifdef CONFIG_IPV6_PRIVACY
673 if (ifa->flags&IFA_F_TEMPORARY) {
674 list_add(&ifa->tmp_list, &idev->tempaddr_list);
675 in6_ifa_hold(ifa);
676 }
677 #endif
678
679 in6_ifa_hold(ifa);
680 write_unlock(&idev->lock);
681 out2:
682 rcu_read_unlock_bh();
683
684 if (likely(err == 0))
685 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
686 else {
687 kfree(ifa);
688 ifa = ERR_PTR(err);
689 }
690
691 return ifa;
692 out:
693 spin_unlock(&addrconf_hash_lock);
694 goto out2;
695 }
696
697 /* This function wants to get referenced ifp and releases it before return */
698
699 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
700 {
701 struct inet6_ifaddr *ifa, *ifn;
702 struct inet6_dev *idev = ifp->idev;
703 int state;
704 int deleted = 0, onlink = 0;
705 unsigned long expires = jiffies;
706
707 spin_lock_bh(&ifp->state_lock);
708 state = ifp->state;
709 ifp->state = INET6_IFADDR_STATE_DEAD;
710 spin_unlock_bh(&ifp->state_lock);
711
712 if (state == INET6_IFADDR_STATE_DEAD)
713 goto out;
714
715 spin_lock_bh(&addrconf_hash_lock);
716 hlist_del_init_rcu(&ifp->addr_lst);
717 spin_unlock_bh(&addrconf_hash_lock);
718
719 write_lock_bh(&idev->lock);
720 #ifdef CONFIG_IPV6_PRIVACY
721 if (ifp->flags&IFA_F_TEMPORARY) {
722 list_del(&ifp->tmp_list);
723 if (ifp->ifpub) {
724 in6_ifa_put(ifp->ifpub);
725 ifp->ifpub = NULL;
726 }
727 __in6_ifa_put(ifp);
728 }
729 #endif
730
731 list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) {
732 if (ifa == ifp) {
733 list_del_init(&ifp->if_list);
734 __in6_ifa_put(ifp);
735
736 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
737 break;
738 deleted = 1;
739 continue;
740 } else if (ifp->flags & IFA_F_PERMANENT) {
741 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
742 ifp->prefix_len)) {
743 if (ifa->flags & IFA_F_PERMANENT) {
744 onlink = 1;
745 if (deleted)
746 break;
747 } else {
748 unsigned long lifetime;
749
750 if (!onlink)
751 onlink = -1;
752
753 spin_lock(&ifa->lock);
754
755 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
756 /*
757 * Note: Because this address is
758 * not permanent, lifetime <
759 * LONG_MAX / HZ here.
760 */
761 if (time_before(expires,
762 ifa->tstamp + lifetime * HZ))
763 expires = ifa->tstamp + lifetime * HZ;
764 spin_unlock(&ifa->lock);
765 }
766 }
767 }
768 }
769 write_unlock_bh(&idev->lock);
770
771 addrconf_del_timer(ifp);
772
773 ipv6_ifa_notify(RTM_DELADDR, ifp);
774
775 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
776
777 /*
778 * Purge or update corresponding prefix
779 *
780 * 1) we don't purge prefix here if address was not permanent.
781 * prefix is managed by its own lifetime.
782 * 2) if there're no addresses, delete prefix.
783 * 3) if there're still other permanent address(es),
784 * corresponding prefix is still permanent.
785 * 4) otherwise, update prefix lifetime to the
786 * longest valid lifetime among the corresponding
787 * addresses on the device.
788 * Note: subsequent RA will update lifetime.
789 *
790 * --yoshfuji
791 */
792 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
793 struct in6_addr prefix;
794 struct rt6_info *rt;
795 struct net *net = dev_net(ifp->idev->dev);
796 struct flowi6 fl6 = {};
797
798 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
799 fl6.flowi6_oif = ifp->idev->dev->ifindex;
800 fl6.daddr = prefix;
801 rt = (struct rt6_info *)ip6_route_lookup(net, &fl6,
802 RT6_LOOKUP_F_IFACE);
803
804 if (rt != net->ipv6.ip6_null_entry &&
805 addrconf_is_prefix_route(rt)) {
806 if (onlink == 0) {
807 ip6_del_rt(rt);
808 rt = NULL;
809 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
810 rt6_set_expires(rt, expires);
811 }
812 }
813 dst_release(&rt->dst);
814 }
815
816 /* clean up prefsrc entries */
817 rt6_remove_prefsrc(ifp);
818 out:
819 in6_ifa_put(ifp);
820 }
821
822 #ifdef CONFIG_IPV6_PRIVACY
823 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
824 {
825 struct inet6_dev *idev = ifp->idev;
826 struct in6_addr addr, *tmpaddr;
827 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
828 unsigned long regen_advance;
829 int tmp_plen;
830 int ret = 0;
831 int max_addresses;
832 u32 addr_flags;
833 unsigned long now = jiffies;
834
835 write_lock(&idev->lock);
836 if (ift) {
837 spin_lock_bh(&ift->lock);
838 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
839 spin_unlock_bh(&ift->lock);
840 tmpaddr = &addr;
841 } else {
842 tmpaddr = NULL;
843 }
844 retry:
845 in6_dev_hold(idev);
846 if (idev->cnf.use_tempaddr <= 0) {
847 write_unlock(&idev->lock);
848 printk(KERN_INFO
849 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
850 in6_dev_put(idev);
851 ret = -1;
852 goto out;
853 }
854 spin_lock_bh(&ifp->lock);
855 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
856 idev->cnf.use_tempaddr = -1; /*XXX*/
857 spin_unlock_bh(&ifp->lock);
858 write_unlock(&idev->lock);
859 printk(KERN_WARNING
860 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
861 in6_dev_put(idev);
862 ret = -1;
863 goto out;
864 }
865 in6_ifa_hold(ifp);
866 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
867 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
868 spin_unlock_bh(&ifp->lock);
869 write_unlock(&idev->lock);
870 printk(KERN_WARNING
871 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
872 in6_ifa_put(ifp);
873 in6_dev_put(idev);
874 ret = -1;
875 goto out;
876 }
877 memcpy(&addr.s6_addr[8], idev->rndid, 8);
878 age = (now - ifp->tstamp) / HZ;
879 tmp_valid_lft = min_t(__u32,
880 ifp->valid_lft,
881 idev->cnf.temp_valid_lft + age);
882 tmp_prefered_lft = min_t(__u32,
883 ifp->prefered_lft,
884 idev->cnf.temp_prefered_lft + age -
885 idev->cnf.max_desync_factor);
886 tmp_plen = ifp->prefix_len;
887 max_addresses = idev->cnf.max_addresses;
888 tmp_tstamp = ifp->tstamp;
889 spin_unlock_bh(&ifp->lock);
890
891 regen_advance = idev->cnf.regen_max_retry *
892 idev->cnf.dad_transmits *
893 idev->nd_parms->retrans_time / HZ;
894 write_unlock(&idev->lock);
895
896 /* A temporary address is created only if this calculated Preferred
897 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
898 * an implementation must not create a temporary address with a zero
899 * Preferred Lifetime.
900 * Use age calculation as in addrconf_verify to avoid unnecessary
901 * temporary addresses being generated.
902 */
903 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
904 if (tmp_prefered_lft <= regen_advance + age) {
905 in6_ifa_put(ifp);
906 in6_dev_put(idev);
907 ret = -1;
908 goto out;
909 }
910
911 addr_flags = IFA_F_TEMPORARY;
912 /* set in addrconf_prefix_rcv() */
913 if (ifp->flags & IFA_F_OPTIMISTIC)
914 addr_flags |= IFA_F_OPTIMISTIC;
915
916 ift = ipv6_add_addr(idev, &addr, tmp_plen,
917 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
918 addr_flags);
919 if (IS_ERR(ift)) {
920 in6_ifa_put(ifp);
921 in6_dev_put(idev);
922 printk(KERN_INFO
923 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
924 tmpaddr = &addr;
925 write_lock(&idev->lock);
926 goto retry;
927 }
928
929 spin_lock_bh(&ift->lock);
930 ift->ifpub = ifp;
931 ift->valid_lft = tmp_valid_lft;
932 ift->prefered_lft = tmp_prefered_lft;
933 ift->cstamp = now;
934 ift->tstamp = tmp_tstamp;
935 spin_unlock_bh(&ift->lock);
936
937 addrconf_dad_start(ift, 0);
938 in6_ifa_put(ift);
939 in6_dev_put(idev);
940 out:
941 return ret;
942 }
943 #endif
944
945 /*
946 * Choose an appropriate source address (RFC3484)
947 */
948 enum {
949 IPV6_SADDR_RULE_INIT = 0,
950 IPV6_SADDR_RULE_LOCAL,
951 IPV6_SADDR_RULE_SCOPE,
952 IPV6_SADDR_RULE_PREFERRED,
953 #ifdef CONFIG_IPV6_MIP6
954 IPV6_SADDR_RULE_HOA,
955 #endif
956 IPV6_SADDR_RULE_OIF,
957 IPV6_SADDR_RULE_LABEL,
958 #ifdef CONFIG_IPV6_PRIVACY
959 IPV6_SADDR_RULE_PRIVACY,
960 #endif
961 IPV6_SADDR_RULE_ORCHID,
962 IPV6_SADDR_RULE_PREFIX,
963 IPV6_SADDR_RULE_MAX
964 };
965
966 struct ipv6_saddr_score {
967 int rule;
968 int addr_type;
969 struct inet6_ifaddr *ifa;
970 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
971 int scopedist;
972 int matchlen;
973 };
974
975 struct ipv6_saddr_dst {
976 const struct in6_addr *addr;
977 int ifindex;
978 int scope;
979 int label;
980 unsigned int prefs;
981 };
982
983 static inline int ipv6_saddr_preferred(int type)
984 {
985 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
986 return 1;
987 return 0;
988 }
989
990 static int ipv6_get_saddr_eval(struct net *net,
991 struct ipv6_saddr_score *score,
992 struct ipv6_saddr_dst *dst,
993 int i)
994 {
995 int ret;
996
997 if (i <= score->rule) {
998 switch (i) {
999 case IPV6_SADDR_RULE_SCOPE:
1000 ret = score->scopedist;
1001 break;
1002 case IPV6_SADDR_RULE_PREFIX:
1003 ret = score->matchlen;
1004 break;
1005 default:
1006 ret = !!test_bit(i, score->scorebits);
1007 }
1008 goto out;
1009 }
1010
1011 switch (i) {
1012 case IPV6_SADDR_RULE_INIT:
1013 /* Rule 0: remember if hiscore is not ready yet */
1014 ret = !!score->ifa;
1015 break;
1016 case IPV6_SADDR_RULE_LOCAL:
1017 /* Rule 1: Prefer same address */
1018 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1019 break;
1020 case IPV6_SADDR_RULE_SCOPE:
1021 /* Rule 2: Prefer appropriate scope
1022 *
1023 * ret
1024 * ^
1025 * -1 | d 15
1026 * ---+--+-+---> scope
1027 * |
1028 * | d is scope of the destination.
1029 * B-d | \
1030 * | \ <- smaller scope is better if
1031 * B-15 | \ if scope is enough for destinaion.
1032 * | ret = B - scope (-1 <= scope >= d <= 15).
1033 * d-C-1 | /
1034 * |/ <- greater is better
1035 * -C / if scope is not enough for destination.
1036 * /| ret = scope - C (-1 <= d < scope <= 15).
1037 *
1038 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1039 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1040 * Assume B = 0 and we get C > 29.
1041 */
1042 ret = __ipv6_addr_src_scope(score->addr_type);
1043 if (ret >= dst->scope)
1044 ret = -ret;
1045 else
1046 ret -= 128; /* 30 is enough */
1047 score->scopedist = ret;
1048 break;
1049 case IPV6_SADDR_RULE_PREFERRED:
1050 /* Rule 3: Avoid deprecated and optimistic addresses */
1051 ret = ipv6_saddr_preferred(score->addr_type) ||
1052 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1053 break;
1054 #ifdef CONFIG_IPV6_MIP6
1055 case IPV6_SADDR_RULE_HOA:
1056 {
1057 /* Rule 4: Prefer home address */
1058 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1059 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1060 break;
1061 }
1062 #endif
1063 case IPV6_SADDR_RULE_OIF:
1064 /* Rule 5: Prefer outgoing interface */
1065 ret = (!dst->ifindex ||
1066 dst->ifindex == score->ifa->idev->dev->ifindex);
1067 break;
1068 case IPV6_SADDR_RULE_LABEL:
1069 /* Rule 6: Prefer matching label */
1070 ret = ipv6_addr_label(net,
1071 &score->ifa->addr, score->addr_type,
1072 score->ifa->idev->dev->ifindex) == dst->label;
1073 break;
1074 #ifdef CONFIG_IPV6_PRIVACY
1075 case IPV6_SADDR_RULE_PRIVACY:
1076 {
1077 /* Rule 7: Prefer public address
1078 * Note: prefer temporary address if use_tempaddr >= 2
1079 */
1080 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1081 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1082 score->ifa->idev->cnf.use_tempaddr >= 2;
1083 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1084 break;
1085 }
1086 #endif
1087 case IPV6_SADDR_RULE_ORCHID:
1088 /* Rule 8-: Prefer ORCHID vs ORCHID or
1089 * non-ORCHID vs non-ORCHID
1090 */
1091 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1092 ipv6_addr_orchid(dst->addr));
1093 break;
1094 case IPV6_SADDR_RULE_PREFIX:
1095 /* Rule 8: Use longest matching prefix */
1096 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr,
1097 dst->addr);
1098 break;
1099 default:
1100 ret = 0;
1101 }
1102
1103 if (ret)
1104 __set_bit(i, score->scorebits);
1105 score->rule = i;
1106 out:
1107 return ret;
1108 }
1109
1110 int ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev,
1111 const struct in6_addr *daddr, unsigned int prefs,
1112 struct in6_addr *saddr)
1113 {
1114 struct ipv6_saddr_score scores[2],
1115 *score = &scores[0], *hiscore = &scores[1];
1116 struct ipv6_saddr_dst dst;
1117 struct net_device *dev;
1118 int dst_type;
1119
1120 dst_type = __ipv6_addr_type(daddr);
1121 dst.addr = daddr;
1122 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1123 dst.scope = __ipv6_addr_src_scope(dst_type);
1124 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1125 dst.prefs = prefs;
1126
1127 hiscore->rule = -1;
1128 hiscore->ifa = NULL;
1129
1130 rcu_read_lock();
1131
1132 for_each_netdev_rcu(net, dev) {
1133 struct inet6_dev *idev;
1134
1135 /* Candidate Source Address (section 4)
1136 * - multicast and link-local destination address,
1137 * the set of candidate source address MUST only
1138 * include addresses assigned to interfaces
1139 * belonging to the same link as the outgoing
1140 * interface.
1141 * (- For site-local destination addresses, the
1142 * set of candidate source addresses MUST only
1143 * include addresses assigned to interfaces
1144 * belonging to the same site as the outgoing
1145 * interface.)
1146 */
1147 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1148 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1149 dst.ifindex && dev->ifindex != dst.ifindex)
1150 continue;
1151
1152 idev = __in6_dev_get(dev);
1153 if (!idev)
1154 continue;
1155
1156 read_lock_bh(&idev->lock);
1157 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1158 int i;
1159
1160 /*
1161 * - Tentative Address (RFC2462 section 5.4)
1162 * - A tentative address is not considered
1163 * "assigned to an interface" in the traditional
1164 * sense, unless it is also flagged as optimistic.
1165 * - Candidate Source Address (section 4)
1166 * - In any case, anycast addresses, multicast
1167 * addresses, and the unspecified address MUST
1168 * NOT be included in a candidate set.
1169 */
1170 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1171 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1172 continue;
1173
1174 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1175
1176 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1177 score->addr_type & IPV6_ADDR_MULTICAST)) {
1178 LIMIT_NETDEBUG(KERN_DEBUG
1179 "ADDRCONF: unspecified / multicast address "
1180 "assigned as unicast address on %s",
1181 dev->name);
1182 continue;
1183 }
1184
1185 score->rule = -1;
1186 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1187
1188 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1189 int minihiscore, miniscore;
1190
1191 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1192 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1193
1194 if (minihiscore > miniscore) {
1195 if (i == IPV6_SADDR_RULE_SCOPE &&
1196 score->scopedist > 0) {
1197 /*
1198 * special case:
1199 * each remaining entry
1200 * has too small (not enough)
1201 * scope, because ifa entries
1202 * are sorted by their scope
1203 * values.
1204 */
1205 goto try_nextdev;
1206 }
1207 break;
1208 } else if (minihiscore < miniscore) {
1209 if (hiscore->ifa)
1210 in6_ifa_put(hiscore->ifa);
1211
1212 in6_ifa_hold(score->ifa);
1213
1214 swap(hiscore, score);
1215
1216 /* restore our iterator */
1217 score->ifa = hiscore->ifa;
1218
1219 break;
1220 }
1221 }
1222 }
1223 try_nextdev:
1224 read_unlock_bh(&idev->lock);
1225 }
1226 rcu_read_unlock();
1227
1228 if (!hiscore->ifa)
1229 return -EADDRNOTAVAIL;
1230
1231 *saddr = hiscore->ifa->addr;
1232 in6_ifa_put(hiscore->ifa);
1233 return 0;
1234 }
1235 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1236
1237 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1238 unsigned char banned_flags)
1239 {
1240 struct inet6_ifaddr *ifp;
1241 int err = -EADDRNOTAVAIL;
1242
1243 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1244 if (ifp->scope == IFA_LINK &&
1245 !(ifp->flags & banned_flags)) {
1246 *addr = ifp->addr;
1247 err = 0;
1248 break;
1249 }
1250 }
1251 return err;
1252 }
1253
1254 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1255 unsigned char banned_flags)
1256 {
1257 struct inet6_dev *idev;
1258 int err = -EADDRNOTAVAIL;
1259
1260 rcu_read_lock();
1261 idev = __in6_dev_get(dev);
1262 if (idev) {
1263 read_lock_bh(&idev->lock);
1264 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1265 read_unlock_bh(&idev->lock);
1266 }
1267 rcu_read_unlock();
1268 return err;
1269 }
1270
1271 static int ipv6_count_addresses(struct inet6_dev *idev)
1272 {
1273 int cnt = 0;
1274 struct inet6_ifaddr *ifp;
1275
1276 read_lock_bh(&idev->lock);
1277 list_for_each_entry(ifp, &idev->addr_list, if_list)
1278 cnt++;
1279 read_unlock_bh(&idev->lock);
1280 return cnt;
1281 }
1282
1283 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1284 struct net_device *dev, int strict)
1285 {
1286 struct inet6_ifaddr *ifp;
1287 struct hlist_node *node;
1288 unsigned int hash = ipv6_addr_hash(addr);
1289
1290 rcu_read_lock_bh();
1291 hlist_for_each_entry_rcu(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1292 if (!net_eq(dev_net(ifp->idev->dev), net))
1293 continue;
1294 if (ipv6_addr_equal(&ifp->addr, addr) &&
1295 !(ifp->flags&IFA_F_TENTATIVE) &&
1296 (dev == NULL || ifp->idev->dev == dev ||
1297 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1298 rcu_read_unlock_bh();
1299 return 1;
1300 }
1301 }
1302
1303 rcu_read_unlock_bh();
1304 return 0;
1305 }
1306 EXPORT_SYMBOL(ipv6_chk_addr);
1307
1308 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1309 struct net_device *dev)
1310 {
1311 unsigned int hash = ipv6_addr_hash(addr);
1312 struct inet6_ifaddr *ifp;
1313 struct hlist_node *node;
1314
1315 hlist_for_each_entry(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1316 if (!net_eq(dev_net(ifp->idev->dev), net))
1317 continue;
1318 if (ipv6_addr_equal(&ifp->addr, addr)) {
1319 if (dev == NULL || ifp->idev->dev == dev)
1320 return true;
1321 }
1322 }
1323 return false;
1324 }
1325
1326 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1327 {
1328 struct inet6_dev *idev;
1329 struct inet6_ifaddr *ifa;
1330 int onlink;
1331
1332 onlink = 0;
1333 rcu_read_lock();
1334 idev = __in6_dev_get(dev);
1335 if (idev) {
1336 read_lock_bh(&idev->lock);
1337 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1338 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1339 ifa->prefix_len);
1340 if (onlink)
1341 break;
1342 }
1343 read_unlock_bh(&idev->lock);
1344 }
1345 rcu_read_unlock();
1346 return onlink;
1347 }
1348
1349 EXPORT_SYMBOL(ipv6_chk_prefix);
1350
1351 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1352 struct net_device *dev, int strict)
1353 {
1354 struct inet6_ifaddr *ifp, *result = NULL;
1355 unsigned int hash = ipv6_addr_hash(addr);
1356 struct hlist_node *node;
1357
1358 rcu_read_lock_bh();
1359 hlist_for_each_entry_rcu_bh(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1360 if (!net_eq(dev_net(ifp->idev->dev), net))
1361 continue;
1362 if (ipv6_addr_equal(&ifp->addr, addr)) {
1363 if (dev == NULL || ifp->idev->dev == dev ||
1364 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1365 result = ifp;
1366 in6_ifa_hold(ifp);
1367 break;
1368 }
1369 }
1370 }
1371 rcu_read_unlock_bh();
1372
1373 return result;
1374 }
1375
1376 /* Gets referenced address, destroys ifaddr */
1377
1378 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1379 {
1380 if (ifp->flags&IFA_F_PERMANENT) {
1381 spin_lock_bh(&ifp->lock);
1382 addrconf_del_timer(ifp);
1383 ifp->flags |= IFA_F_TENTATIVE;
1384 if (dad_failed)
1385 ifp->flags |= IFA_F_DADFAILED;
1386 spin_unlock_bh(&ifp->lock);
1387 if (dad_failed)
1388 ipv6_ifa_notify(0, ifp);
1389 in6_ifa_put(ifp);
1390 #ifdef CONFIG_IPV6_PRIVACY
1391 } else if (ifp->flags&IFA_F_TEMPORARY) {
1392 struct inet6_ifaddr *ifpub;
1393 spin_lock_bh(&ifp->lock);
1394 ifpub = ifp->ifpub;
1395 if (ifpub) {
1396 in6_ifa_hold(ifpub);
1397 spin_unlock_bh(&ifp->lock);
1398 ipv6_create_tempaddr(ifpub, ifp);
1399 in6_ifa_put(ifpub);
1400 } else {
1401 spin_unlock_bh(&ifp->lock);
1402 }
1403 ipv6_del_addr(ifp);
1404 #endif
1405 } else
1406 ipv6_del_addr(ifp);
1407 }
1408
1409 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1410 {
1411 int err = -ENOENT;
1412
1413 spin_lock(&ifp->state_lock);
1414 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1415 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1416 err = 0;
1417 }
1418 spin_unlock(&ifp->state_lock);
1419
1420 return err;
1421 }
1422
1423 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1424 {
1425 struct inet6_dev *idev = ifp->idev;
1426
1427 if (addrconf_dad_end(ifp)) {
1428 in6_ifa_put(ifp);
1429 return;
1430 }
1431
1432 if (net_ratelimit())
1433 printk(KERN_INFO "%s: IPv6 duplicate address %pI6c detected!\n",
1434 ifp->idev->dev->name, &ifp->addr);
1435
1436 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1437 struct in6_addr addr;
1438
1439 addr.s6_addr32[0] = htonl(0xfe800000);
1440 addr.s6_addr32[1] = 0;
1441
1442 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1443 ipv6_addr_equal(&ifp->addr, &addr)) {
1444 /* DAD failed for link-local based on MAC address */
1445 idev->cnf.disable_ipv6 = 1;
1446
1447 printk(KERN_INFO "%s: IPv6 being disabled!\n",
1448 ifp->idev->dev->name);
1449 }
1450 }
1451
1452 addrconf_dad_stop(ifp, 1);
1453 }
1454
1455 /* Join to solicited addr multicast group. */
1456
1457 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1458 {
1459 struct in6_addr maddr;
1460
1461 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1462 return;
1463
1464 addrconf_addr_solict_mult(addr, &maddr);
1465 ipv6_dev_mc_inc(dev, &maddr);
1466 }
1467
1468 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1469 {
1470 struct in6_addr maddr;
1471
1472 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1473 return;
1474
1475 addrconf_addr_solict_mult(addr, &maddr);
1476 __ipv6_dev_mc_dec(idev, &maddr);
1477 }
1478
1479 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1480 {
1481 struct in6_addr addr;
1482 if (ifp->prefix_len == 127) /* RFC 6164 */
1483 return;
1484 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1485 if (ipv6_addr_any(&addr))
1486 return;
1487 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1488 }
1489
1490 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1491 {
1492 struct in6_addr addr;
1493 if (ifp->prefix_len == 127) /* RFC 6164 */
1494 return;
1495 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1496 if (ipv6_addr_any(&addr))
1497 return;
1498 __ipv6_dev_ac_dec(ifp->idev, &addr);
1499 }
1500
1501 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1502 {
1503 if (dev->addr_len != ETH_ALEN)
1504 return -1;
1505 memcpy(eui, dev->dev_addr, 3);
1506 memcpy(eui + 5, dev->dev_addr + 3, 3);
1507
1508 /*
1509 * The zSeries OSA network cards can be shared among various
1510 * OS instances, but the OSA cards have only one MAC address.
1511 * This leads to duplicate address conflicts in conjunction
1512 * with IPv6 if more than one instance uses the same card.
1513 *
1514 * The driver for these cards can deliver a unique 16-bit
1515 * identifier for each instance sharing the same card. It is
1516 * placed instead of 0xFFFE in the interface identifier. The
1517 * "u" bit of the interface identifier is not inverted in this
1518 * case. Hence the resulting interface identifier has local
1519 * scope according to RFC2373.
1520 */
1521 if (dev->dev_id) {
1522 eui[3] = (dev->dev_id >> 8) & 0xFF;
1523 eui[4] = dev->dev_id & 0xFF;
1524 } else {
1525 eui[3] = 0xFF;
1526 eui[4] = 0xFE;
1527 eui[0] ^= 2;
1528 }
1529 return 0;
1530 }
1531
1532 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1533 {
1534 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1535 if (dev->addr_len != ARCNET_ALEN)
1536 return -1;
1537 memset(eui, 0, 7);
1538 eui[7] = *(u8*)dev->dev_addr;
1539 return 0;
1540 }
1541
1542 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1543 {
1544 if (dev->addr_len != INFINIBAND_ALEN)
1545 return -1;
1546 memcpy(eui, dev->dev_addr + 12, 8);
1547 eui[0] |= 2;
1548 return 0;
1549 }
1550
1551 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1552 {
1553 if (addr == 0)
1554 return -1;
1555 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1556 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1557 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1558 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1559 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1560 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1561 eui[1] = 0;
1562 eui[2] = 0x5E;
1563 eui[3] = 0xFE;
1564 memcpy(eui + 4, &addr, 4);
1565 return 0;
1566 }
1567
1568 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1569 {
1570 if (dev->priv_flags & IFF_ISATAP)
1571 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1572 return -1;
1573 }
1574
1575 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
1576 {
1577 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1578 }
1579
1580 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1581 {
1582 switch (dev->type) {
1583 case ARPHRD_ETHER:
1584 case ARPHRD_FDDI:
1585 case ARPHRD_IEEE802_TR:
1586 return addrconf_ifid_eui48(eui, dev);
1587 case ARPHRD_ARCNET:
1588 return addrconf_ifid_arcnet(eui, dev);
1589 case ARPHRD_INFINIBAND:
1590 return addrconf_ifid_infiniband(eui, dev);
1591 case ARPHRD_SIT:
1592 return addrconf_ifid_sit(eui, dev);
1593 case ARPHRD_IPGRE:
1594 return addrconf_ifid_gre(eui, dev);
1595 }
1596 return -1;
1597 }
1598
1599 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1600 {
1601 int err = -1;
1602 struct inet6_ifaddr *ifp;
1603
1604 read_lock_bh(&idev->lock);
1605 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1606 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1607 memcpy(eui, ifp->addr.s6_addr+8, 8);
1608 err = 0;
1609 break;
1610 }
1611 }
1612 read_unlock_bh(&idev->lock);
1613 return err;
1614 }
1615
1616 #ifdef CONFIG_IPV6_PRIVACY
1617 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1618 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1619 {
1620 regen:
1621 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1622 idev->rndid[0] &= ~0x02;
1623
1624 /*
1625 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1626 * check if generated address is not inappropriate
1627 *
1628 * - Reserved subnet anycast (RFC 2526)
1629 * 11111101 11....11 1xxxxxxx
1630 * - ISATAP (RFC4214) 6.1
1631 * 00-00-5E-FE-xx-xx-xx-xx
1632 * - value 0
1633 * - XXX: already assigned to an address on the device
1634 */
1635 if (idev->rndid[0] == 0xfd &&
1636 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1637 (idev->rndid[7]&0x80))
1638 goto regen;
1639 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1640 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1641 goto regen;
1642 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1643 goto regen;
1644 }
1645
1646 return 0;
1647 }
1648
1649 static void ipv6_regen_rndid(unsigned long data)
1650 {
1651 struct inet6_dev *idev = (struct inet6_dev *) data;
1652 unsigned long expires;
1653
1654 rcu_read_lock_bh();
1655 write_lock_bh(&idev->lock);
1656
1657 if (idev->dead)
1658 goto out;
1659
1660 if (__ipv6_regen_rndid(idev) < 0)
1661 goto out;
1662
1663 expires = jiffies +
1664 idev->cnf.temp_prefered_lft * HZ -
1665 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time -
1666 idev->cnf.max_desync_factor * HZ;
1667 if (time_before(expires, jiffies)) {
1668 printk(KERN_WARNING
1669 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1670 idev->dev->name);
1671 goto out;
1672 }
1673
1674 if (!mod_timer(&idev->regen_timer, expires))
1675 in6_dev_hold(idev);
1676
1677 out:
1678 write_unlock_bh(&idev->lock);
1679 rcu_read_unlock_bh();
1680 in6_dev_put(idev);
1681 }
1682
1683 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1684 int ret = 0;
1685
1686 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1687 ret = __ipv6_regen_rndid(idev);
1688 return ret;
1689 }
1690 #endif
1691
1692 /*
1693 * Add prefix route.
1694 */
1695
1696 static void
1697 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1698 unsigned long expires, u32 flags)
1699 {
1700 struct fib6_config cfg = {
1701 .fc_table = RT6_TABLE_PREFIX,
1702 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1703 .fc_ifindex = dev->ifindex,
1704 .fc_expires = expires,
1705 .fc_dst_len = plen,
1706 .fc_flags = RTF_UP | flags,
1707 .fc_nlinfo.nl_net = dev_net(dev),
1708 .fc_protocol = RTPROT_KERNEL,
1709 };
1710
1711 cfg.fc_dst = *pfx;
1712
1713 /* Prevent useless cloning on PtP SIT.
1714 This thing is done here expecting that the whole
1715 class of non-broadcast devices need not cloning.
1716 */
1717 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1718 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1719 cfg.fc_flags |= RTF_NONEXTHOP;
1720 #endif
1721
1722 ip6_route_add(&cfg);
1723 }
1724
1725
1726 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
1727 int plen,
1728 const struct net_device *dev,
1729 u32 flags, u32 noflags)
1730 {
1731 struct fib6_node *fn;
1732 struct rt6_info *rt = NULL;
1733 struct fib6_table *table;
1734
1735 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX);
1736 if (table == NULL)
1737 return NULL;
1738
1739 write_lock_bh(&table->tb6_lock);
1740 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
1741 if (!fn)
1742 goto out;
1743 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1744 if (rt->dst.dev->ifindex != dev->ifindex)
1745 continue;
1746 if ((rt->rt6i_flags & flags) != flags)
1747 continue;
1748 if ((rt->rt6i_flags & noflags) != 0)
1749 continue;
1750 dst_hold(&rt->dst);
1751 break;
1752 }
1753 out:
1754 write_unlock_bh(&table->tb6_lock);
1755 return rt;
1756 }
1757
1758
1759 /* Create "default" multicast route to the interface */
1760
1761 static void addrconf_add_mroute(struct net_device *dev)
1762 {
1763 struct fib6_config cfg = {
1764 .fc_table = RT6_TABLE_LOCAL,
1765 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1766 .fc_ifindex = dev->ifindex,
1767 .fc_dst_len = 8,
1768 .fc_flags = RTF_UP,
1769 .fc_nlinfo.nl_net = dev_net(dev),
1770 };
1771
1772 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1773
1774 ip6_route_add(&cfg);
1775 }
1776
1777 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1778 static void sit_route_add(struct net_device *dev)
1779 {
1780 struct fib6_config cfg = {
1781 .fc_table = RT6_TABLE_MAIN,
1782 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1783 .fc_ifindex = dev->ifindex,
1784 .fc_dst_len = 96,
1785 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1786 .fc_nlinfo.nl_net = dev_net(dev),
1787 };
1788
1789 /* prefix length - 96 bits "::d.d.d.d" */
1790 ip6_route_add(&cfg);
1791 }
1792 #endif
1793
1794 static void addrconf_add_lroute(struct net_device *dev)
1795 {
1796 struct in6_addr addr;
1797
1798 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1799 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1800 }
1801
1802 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1803 {
1804 struct inet6_dev *idev;
1805
1806 ASSERT_RTNL();
1807
1808 idev = ipv6_find_idev(dev);
1809 if (!idev)
1810 return ERR_PTR(-ENOBUFS);
1811
1812 if (idev->cnf.disable_ipv6)
1813 return ERR_PTR(-EACCES);
1814
1815 /* Add default multicast route */
1816 if (!(dev->flags & IFF_LOOPBACK))
1817 addrconf_add_mroute(dev);
1818
1819 /* Add link local route */
1820 addrconf_add_lroute(dev);
1821 return idev;
1822 }
1823
1824 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
1825 {
1826 struct prefix_info *pinfo;
1827 __u32 valid_lft;
1828 __u32 prefered_lft;
1829 int addr_type;
1830 struct inet6_dev *in6_dev;
1831 struct net *net = dev_net(dev);
1832
1833 pinfo = (struct prefix_info *) opt;
1834
1835 if (len < sizeof(struct prefix_info)) {
1836 ADBG(("addrconf: prefix option too short\n"));
1837 return;
1838 }
1839
1840 /*
1841 * Validation checks ([ADDRCONF], page 19)
1842 */
1843
1844 addr_type = ipv6_addr_type(&pinfo->prefix);
1845
1846 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1847 return;
1848
1849 valid_lft = ntohl(pinfo->valid);
1850 prefered_lft = ntohl(pinfo->prefered);
1851
1852 if (prefered_lft > valid_lft) {
1853 if (net_ratelimit())
1854 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1855 return;
1856 }
1857
1858 in6_dev = in6_dev_get(dev);
1859
1860 if (in6_dev == NULL) {
1861 if (net_ratelimit())
1862 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1863 return;
1864 }
1865
1866 /*
1867 * Two things going on here:
1868 * 1) Add routes for on-link prefixes
1869 * 2) Configure prefixes with the auto flag set
1870 */
1871
1872 if (pinfo->onlink) {
1873 struct rt6_info *rt;
1874 unsigned long rt_expires;
1875
1876 /* Avoid arithmetic overflow. Really, we could
1877 * save rt_expires in seconds, likely valid_lft,
1878 * but it would require division in fib gc, that it
1879 * not good.
1880 */
1881 if (HZ > USER_HZ)
1882 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
1883 else
1884 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
1885
1886 if (addrconf_finite_timeout(rt_expires))
1887 rt_expires *= HZ;
1888
1889 rt = addrconf_get_prefix_route(&pinfo->prefix,
1890 pinfo->prefix_len,
1891 dev,
1892 RTF_ADDRCONF | RTF_PREFIX_RT,
1893 RTF_GATEWAY | RTF_DEFAULT);
1894
1895 if (rt) {
1896 /* Autoconf prefix route */
1897 if (valid_lft == 0) {
1898 ip6_del_rt(rt);
1899 rt = NULL;
1900 } else if (addrconf_finite_timeout(rt_expires)) {
1901 /* not infinity */
1902 rt6_set_expires(rt, jiffies + rt_expires);
1903 } else {
1904 rt6_clean_expires(rt);
1905 }
1906 } else if (valid_lft) {
1907 clock_t expires = 0;
1908 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
1909 if (addrconf_finite_timeout(rt_expires)) {
1910 /* not infinity */
1911 flags |= RTF_EXPIRES;
1912 expires = jiffies_to_clock_t(rt_expires);
1913 }
1914 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1915 dev, expires, flags);
1916 }
1917 if (rt)
1918 dst_release(&rt->dst);
1919 }
1920
1921 /* Try to figure out our local address for this prefix */
1922
1923 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1924 struct inet6_ifaddr * ifp;
1925 struct in6_addr addr;
1926 int create = 0, update_lft = 0;
1927
1928 if (pinfo->prefix_len == 64) {
1929 memcpy(&addr, &pinfo->prefix, 8);
1930 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1931 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1932 in6_dev_put(in6_dev);
1933 return;
1934 }
1935 goto ok;
1936 }
1937 if (net_ratelimit())
1938 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1939 pinfo->prefix_len);
1940 in6_dev_put(in6_dev);
1941 return;
1942
1943 ok:
1944
1945 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1946
1947 if (ifp == NULL && valid_lft) {
1948 int max_addresses = in6_dev->cnf.max_addresses;
1949 u32 addr_flags = 0;
1950
1951 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1952 if (in6_dev->cnf.optimistic_dad &&
1953 !net->ipv6.devconf_all->forwarding && sllao)
1954 addr_flags = IFA_F_OPTIMISTIC;
1955 #endif
1956
1957 /* Do not allow to create too much of autoconfigured
1958 * addresses; this would be too easy way to crash kernel.
1959 */
1960 if (!max_addresses ||
1961 ipv6_count_addresses(in6_dev) < max_addresses)
1962 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1963 addr_type&IPV6_ADDR_SCOPE_MASK,
1964 addr_flags);
1965
1966 if (!ifp || IS_ERR(ifp)) {
1967 in6_dev_put(in6_dev);
1968 return;
1969 }
1970
1971 update_lft = create = 1;
1972 ifp->cstamp = jiffies;
1973 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1974 }
1975
1976 if (ifp) {
1977 int flags;
1978 unsigned long now;
1979 #ifdef CONFIG_IPV6_PRIVACY
1980 struct inet6_ifaddr *ift;
1981 #endif
1982 u32 stored_lft;
1983
1984 /* update lifetime (RFC2462 5.5.3 e) */
1985 spin_lock(&ifp->lock);
1986 now = jiffies;
1987 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1988 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1989 else
1990 stored_lft = 0;
1991 if (!update_lft && stored_lft) {
1992 if (valid_lft > MIN_VALID_LIFETIME ||
1993 valid_lft > stored_lft)
1994 update_lft = 1;
1995 else if (stored_lft <= MIN_VALID_LIFETIME) {
1996 /* valid_lft <= stored_lft is always true */
1997 /*
1998 * RFC 4862 Section 5.5.3e:
1999 * "Note that the preferred lifetime of
2000 * the corresponding address is always
2001 * reset to the Preferred Lifetime in
2002 * the received Prefix Information
2003 * option, regardless of whether the
2004 * valid lifetime is also reset or
2005 * ignored."
2006 *
2007 * So if the preferred lifetime in
2008 * this advertisement is different
2009 * than what we have stored, but the
2010 * valid lifetime is invalid, just
2011 * reset prefered_lft.
2012 *
2013 * We must set the valid lifetime
2014 * to the stored lifetime since we'll
2015 * be updating the timestamp below,
2016 * else we'll set it back to the
2017 * minimum.
2018 */
2019 if (prefered_lft != ifp->prefered_lft) {
2020 valid_lft = stored_lft;
2021 update_lft = 1;
2022 }
2023 } else {
2024 valid_lft = MIN_VALID_LIFETIME;
2025 if (valid_lft < prefered_lft)
2026 prefered_lft = valid_lft;
2027 update_lft = 1;
2028 }
2029 }
2030
2031 if (update_lft) {
2032 ifp->valid_lft = valid_lft;
2033 ifp->prefered_lft = prefered_lft;
2034 ifp->tstamp = now;
2035 flags = ifp->flags;
2036 ifp->flags &= ~IFA_F_DEPRECATED;
2037 spin_unlock(&ifp->lock);
2038
2039 if (!(flags&IFA_F_TENTATIVE))
2040 ipv6_ifa_notify(0, ifp);
2041 } else
2042 spin_unlock(&ifp->lock);
2043
2044 #ifdef CONFIG_IPV6_PRIVACY
2045 read_lock_bh(&in6_dev->lock);
2046 /* update all temporary addresses in the list */
2047 list_for_each_entry(ift, &in6_dev->tempaddr_list,
2048 tmp_list) {
2049 int age, max_valid, max_prefered;
2050
2051 if (ifp != ift->ifpub)
2052 continue;
2053
2054 /*
2055 * RFC 4941 section 3.3:
2056 * If a received option will extend the lifetime
2057 * of a public address, the lifetimes of
2058 * temporary addresses should be extended,
2059 * subject to the overall constraint that no
2060 * temporary addresses should ever remain
2061 * "valid" or "preferred" for a time longer than
2062 * (TEMP_VALID_LIFETIME) or
2063 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR),
2064 * respectively.
2065 */
2066 age = (now - ift->cstamp) / HZ;
2067 max_valid = in6_dev->cnf.temp_valid_lft - age;
2068 if (max_valid < 0)
2069 max_valid = 0;
2070
2071 max_prefered = in6_dev->cnf.temp_prefered_lft -
2072 in6_dev->cnf.max_desync_factor -
2073 age;
2074 if (max_prefered < 0)
2075 max_prefered = 0;
2076
2077 if (valid_lft > max_valid)
2078 valid_lft = max_valid;
2079
2080 if (prefered_lft > max_prefered)
2081 prefered_lft = max_prefered;
2082
2083 spin_lock(&ift->lock);
2084 flags = ift->flags;
2085 ift->valid_lft = valid_lft;
2086 ift->prefered_lft = prefered_lft;
2087 ift->tstamp = now;
2088 if (prefered_lft > 0)
2089 ift->flags &= ~IFA_F_DEPRECATED;
2090
2091 spin_unlock(&ift->lock);
2092 if (!(flags&IFA_F_TENTATIVE))
2093 ipv6_ifa_notify(0, ift);
2094 }
2095
2096 if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) {
2097 /*
2098 * When a new public address is created as
2099 * described in [ADDRCONF], also create a new
2100 * temporary address. Also create a temporary
2101 * address if it's enabled but no temporary
2102 * address currently exists.
2103 */
2104 read_unlock_bh(&in6_dev->lock);
2105 ipv6_create_tempaddr(ifp, NULL);
2106 } else {
2107 read_unlock_bh(&in6_dev->lock);
2108 }
2109 #endif
2110 in6_ifa_put(ifp);
2111 addrconf_verify(0);
2112 }
2113 }
2114 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2115 in6_dev_put(in6_dev);
2116 }
2117
2118 /*
2119 * Set destination address.
2120 * Special case for SIT interfaces where we create a new "virtual"
2121 * device.
2122 */
2123 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2124 {
2125 struct in6_ifreq ireq;
2126 struct net_device *dev;
2127 int err = -EINVAL;
2128
2129 rtnl_lock();
2130
2131 err = -EFAULT;
2132 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2133 goto err_exit;
2134
2135 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2136
2137 err = -ENODEV;
2138 if (dev == NULL)
2139 goto err_exit;
2140
2141 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2142 if (dev->type == ARPHRD_SIT) {
2143 const struct net_device_ops *ops = dev->netdev_ops;
2144 struct ifreq ifr;
2145 struct ip_tunnel_parm p;
2146
2147 err = -EADDRNOTAVAIL;
2148 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2149 goto err_exit;
2150
2151 memset(&p, 0, sizeof(p));
2152 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2153 p.iph.saddr = 0;
2154 p.iph.version = 4;
2155 p.iph.ihl = 5;
2156 p.iph.protocol = IPPROTO_IPV6;
2157 p.iph.ttl = 64;
2158 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2159
2160 if (ops->ndo_do_ioctl) {
2161 mm_segment_t oldfs = get_fs();
2162
2163 set_fs(KERNEL_DS);
2164 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2165 set_fs(oldfs);
2166 } else
2167 err = -EOPNOTSUPP;
2168
2169 if (err == 0) {
2170 err = -ENOBUFS;
2171 dev = __dev_get_by_name(net, p.name);
2172 if (!dev)
2173 goto err_exit;
2174 err = dev_open(dev);
2175 }
2176 }
2177 #endif
2178
2179 err_exit:
2180 rtnl_unlock();
2181 return err;
2182 }
2183
2184 /*
2185 * Manual configuration of address on an interface
2186 */
2187 static int inet6_addr_add(struct net *net, int ifindex, const struct in6_addr *pfx,
2188 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
2189 __u32 valid_lft)
2190 {
2191 struct inet6_ifaddr *ifp;
2192 struct inet6_dev *idev;
2193 struct net_device *dev;
2194 int scope;
2195 u32 flags;
2196 clock_t expires;
2197 unsigned long timeout;
2198
2199 ASSERT_RTNL();
2200
2201 if (plen > 128)
2202 return -EINVAL;
2203
2204 /* check the lifetime */
2205 if (!valid_lft || prefered_lft > valid_lft)
2206 return -EINVAL;
2207
2208 dev = __dev_get_by_index(net, ifindex);
2209 if (!dev)
2210 return -ENODEV;
2211
2212 idev = addrconf_add_dev(dev);
2213 if (IS_ERR(idev))
2214 return PTR_ERR(idev);
2215
2216 scope = ipv6_addr_scope(pfx);
2217
2218 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2219 if (addrconf_finite_timeout(timeout)) {
2220 expires = jiffies_to_clock_t(timeout * HZ);
2221 valid_lft = timeout;
2222 flags = RTF_EXPIRES;
2223 } else {
2224 expires = 0;
2225 flags = 0;
2226 ifa_flags |= IFA_F_PERMANENT;
2227 }
2228
2229 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2230 if (addrconf_finite_timeout(timeout)) {
2231 if (timeout == 0)
2232 ifa_flags |= IFA_F_DEPRECATED;
2233 prefered_lft = timeout;
2234 }
2235
2236 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2237
2238 if (!IS_ERR(ifp)) {
2239 spin_lock_bh(&ifp->lock);
2240 ifp->valid_lft = valid_lft;
2241 ifp->prefered_lft = prefered_lft;
2242 ifp->tstamp = jiffies;
2243 spin_unlock_bh(&ifp->lock);
2244
2245 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2246 expires, flags);
2247 /*
2248 * Note that section 3.1 of RFC 4429 indicates
2249 * that the Optimistic flag should not be set for
2250 * manually configured addresses
2251 */
2252 addrconf_dad_start(ifp, 0);
2253 in6_ifa_put(ifp);
2254 addrconf_verify(0);
2255 return 0;
2256 }
2257
2258 return PTR_ERR(ifp);
2259 }
2260
2261 static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx,
2262 unsigned int plen)
2263 {
2264 struct inet6_ifaddr *ifp;
2265 struct inet6_dev *idev;
2266 struct net_device *dev;
2267
2268 if (plen > 128)
2269 return -EINVAL;
2270
2271 dev = __dev_get_by_index(net, ifindex);
2272 if (!dev)
2273 return -ENODEV;
2274
2275 if ((idev = __in6_dev_get(dev)) == NULL)
2276 return -ENXIO;
2277
2278 read_lock_bh(&idev->lock);
2279 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2280 if (ifp->prefix_len == plen &&
2281 ipv6_addr_equal(pfx, &ifp->addr)) {
2282 in6_ifa_hold(ifp);
2283 read_unlock_bh(&idev->lock);
2284
2285 ipv6_del_addr(ifp);
2286
2287 /* If the last address is deleted administratively,
2288 disable IPv6 on this interface.
2289 */
2290 if (list_empty(&idev->addr_list))
2291 addrconf_ifdown(idev->dev, 1);
2292 return 0;
2293 }
2294 }
2295 read_unlock_bh(&idev->lock);
2296 return -EADDRNOTAVAIL;
2297 }
2298
2299
2300 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2301 {
2302 struct in6_ifreq ireq;
2303 int err;
2304
2305 if (!capable(CAP_NET_ADMIN))
2306 return -EPERM;
2307
2308 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2309 return -EFAULT;
2310
2311 rtnl_lock();
2312 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2313 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2314 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2315 rtnl_unlock();
2316 return err;
2317 }
2318
2319 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2320 {
2321 struct in6_ifreq ireq;
2322 int err;
2323
2324 if (!capable(CAP_NET_ADMIN))
2325 return -EPERM;
2326
2327 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2328 return -EFAULT;
2329
2330 rtnl_lock();
2331 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2332 ireq.ifr6_prefixlen);
2333 rtnl_unlock();
2334 return err;
2335 }
2336
2337 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2338 int plen, int scope)
2339 {
2340 struct inet6_ifaddr *ifp;
2341
2342 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT);
2343 if (!IS_ERR(ifp)) {
2344 spin_lock_bh(&ifp->lock);
2345 ifp->flags &= ~IFA_F_TENTATIVE;
2346 spin_unlock_bh(&ifp->lock);
2347 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2348 in6_ifa_put(ifp);
2349 }
2350 }
2351
2352 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2353 static void sit_add_v4_addrs(struct inet6_dev *idev)
2354 {
2355 struct in6_addr addr;
2356 struct net_device *dev;
2357 struct net *net = dev_net(idev->dev);
2358 int scope;
2359
2360 ASSERT_RTNL();
2361
2362 memset(&addr, 0, sizeof(struct in6_addr));
2363 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2364
2365 if (idev->dev->flags&IFF_POINTOPOINT) {
2366 addr.s6_addr32[0] = htonl(0xfe800000);
2367 scope = IFA_LINK;
2368 } else {
2369 scope = IPV6_ADDR_COMPATv4;
2370 }
2371
2372 if (addr.s6_addr32[3]) {
2373 add_addr(idev, &addr, 128, scope);
2374 return;
2375 }
2376
2377 for_each_netdev(net, dev) {
2378 struct in_device * in_dev = __in_dev_get_rtnl(dev);
2379 if (in_dev && (dev->flags & IFF_UP)) {
2380 struct in_ifaddr * ifa;
2381
2382 int flag = scope;
2383
2384 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2385 int plen;
2386
2387 addr.s6_addr32[3] = ifa->ifa_local;
2388
2389 if (ifa->ifa_scope == RT_SCOPE_LINK)
2390 continue;
2391 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2392 if (idev->dev->flags&IFF_POINTOPOINT)
2393 continue;
2394 flag |= IFA_HOST;
2395 }
2396 if (idev->dev->flags&IFF_POINTOPOINT)
2397 plen = 64;
2398 else
2399 plen = 96;
2400
2401 add_addr(idev, &addr, plen, flag);
2402 }
2403 }
2404 }
2405 }
2406 #endif
2407
2408 static void init_loopback(struct net_device *dev)
2409 {
2410 struct inet6_dev *idev;
2411 struct net_device *sp_dev;
2412 struct inet6_ifaddr *sp_ifa;
2413 struct rt6_info *sp_rt;
2414
2415 /* ::1 */
2416
2417 ASSERT_RTNL();
2418
2419 if ((idev = ipv6_find_idev(dev)) == NULL) {
2420 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2421 return;
2422 }
2423
2424 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2425
2426 /* Add routes to other interface's IPv6 addresses */
2427 for_each_netdev(dev_net(dev), sp_dev) {
2428 if (!strcmp(sp_dev->name, dev->name))
2429 continue;
2430
2431 idev = __in6_dev_get(sp_dev);
2432 if (!idev)
2433 continue;
2434
2435 read_lock_bh(&idev->lock);
2436 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
2437
2438 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
2439 continue;
2440
2441 if (sp_ifa->rt) {
2442 /* This dst has been added to garbage list when
2443 * lo device down, release this obsolete dst and
2444 * reallocate a new router for ifa.
2445 */
2446 if (sp_ifa->rt->dst.obsolete > 0) {
2447 dst_release(&sp_ifa->rt->dst);
2448 sp_ifa->rt = NULL;
2449 } else {
2450 continue;
2451 }
2452 }
2453
2454 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, 0);
2455
2456 /* Failure cases are ignored */
2457 if (!IS_ERR(sp_rt)) {
2458 sp_ifa->rt = sp_rt;
2459 ip6_ins_rt(sp_rt);
2460 }
2461 }
2462 read_unlock_bh(&idev->lock);
2463 }
2464 }
2465
2466 static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr)
2467 {
2468 struct inet6_ifaddr * ifp;
2469 u32 addr_flags = IFA_F_PERMANENT;
2470
2471 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2472 if (idev->cnf.optimistic_dad &&
2473 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2474 addr_flags |= IFA_F_OPTIMISTIC;
2475 #endif
2476
2477
2478 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2479 if (!IS_ERR(ifp)) {
2480 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2481 addrconf_dad_start(ifp, 0);
2482 in6_ifa_put(ifp);
2483 }
2484 }
2485
2486 static void addrconf_dev_config(struct net_device *dev)
2487 {
2488 struct in6_addr addr;
2489 struct inet6_dev * idev;
2490
2491 ASSERT_RTNL();
2492
2493 if ((dev->type != ARPHRD_ETHER) &&
2494 (dev->type != ARPHRD_FDDI) &&
2495 (dev->type != ARPHRD_IEEE802_TR) &&
2496 (dev->type != ARPHRD_ARCNET) &&
2497 (dev->type != ARPHRD_INFINIBAND)) {
2498 /* Alas, we support only Ethernet autoconfiguration. */
2499 return;
2500 }
2501
2502 idev = addrconf_add_dev(dev);
2503 if (IS_ERR(idev))
2504 return;
2505
2506 memset(&addr, 0, sizeof(struct in6_addr));
2507 addr.s6_addr32[0] = htonl(0xFE800000);
2508
2509 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2510 addrconf_add_linklocal(idev, &addr);
2511 }
2512
2513 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2514 static void addrconf_sit_config(struct net_device *dev)
2515 {
2516 struct inet6_dev *idev;
2517
2518 ASSERT_RTNL();
2519
2520 /*
2521 * Configure the tunnel with one of our IPv4
2522 * addresses... we should configure all of
2523 * our v4 addrs in the tunnel
2524 */
2525
2526 if ((idev = ipv6_find_idev(dev)) == NULL) {
2527 printk(KERN_DEBUG "init sit: add_dev failed\n");
2528 return;
2529 }
2530
2531 if (dev->priv_flags & IFF_ISATAP) {
2532 struct in6_addr addr;
2533
2534 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2535 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2536 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2537 addrconf_add_linklocal(idev, &addr);
2538 return;
2539 }
2540
2541 sit_add_v4_addrs(idev);
2542
2543 if (dev->flags&IFF_POINTOPOINT) {
2544 addrconf_add_mroute(dev);
2545 addrconf_add_lroute(dev);
2546 } else
2547 sit_route_add(dev);
2548 }
2549 #endif
2550
2551 #if defined(CONFIG_NET_IPGRE) || defined(CONFIG_NET_IPGRE_MODULE)
2552 static void addrconf_gre_config(struct net_device *dev)
2553 {
2554 struct inet6_dev *idev;
2555 struct in6_addr addr;
2556
2557 pr_info("ipv6: addrconf_gre_config(%s)\n", dev->name);
2558
2559 ASSERT_RTNL();
2560
2561 if ((idev = ipv6_find_idev(dev)) == NULL) {
2562 printk(KERN_DEBUG "init gre: add_dev failed\n");
2563 return;
2564 }
2565
2566 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2567 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2568
2569 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2570 addrconf_add_linklocal(idev, &addr);
2571 }
2572 #endif
2573
2574 static inline int
2575 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2576 {
2577 struct in6_addr lladdr;
2578
2579 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2580 addrconf_add_linklocal(idev, &lladdr);
2581 return 0;
2582 }
2583 return -1;
2584 }
2585
2586 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2587 {
2588 struct net_device *link_dev;
2589 struct net *net = dev_net(idev->dev);
2590
2591 /* first try to inherit the link-local address from the link device */
2592 if (idev->dev->iflink &&
2593 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
2594 if (!ipv6_inherit_linklocal(idev, link_dev))
2595 return;
2596 }
2597 /* then try to inherit it from any device */
2598 for_each_netdev(net, link_dev) {
2599 if (!ipv6_inherit_linklocal(idev, link_dev))
2600 return;
2601 }
2602 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2603 }
2604
2605 /*
2606 * Autoconfigure tunnel with a link-local address so routing protocols,
2607 * DHCPv6, MLD etc. can be run over the virtual link
2608 */
2609
2610 static void addrconf_ip6_tnl_config(struct net_device *dev)
2611 {
2612 struct inet6_dev *idev;
2613
2614 ASSERT_RTNL();
2615
2616 idev = addrconf_add_dev(dev);
2617 if (IS_ERR(idev)) {
2618 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2619 return;
2620 }
2621 ip6_tnl_add_linklocal(idev);
2622 }
2623
2624 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2625 void * data)
2626 {
2627 struct net_device *dev = (struct net_device *) data;
2628 struct inet6_dev *idev = __in6_dev_get(dev);
2629 int run_pending = 0;
2630 int err;
2631
2632 switch (event) {
2633 case NETDEV_REGISTER:
2634 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2635 idev = ipv6_add_dev(dev);
2636 if (!idev)
2637 return notifier_from_errno(-ENOMEM);
2638 }
2639 break;
2640
2641 case NETDEV_UP:
2642 case NETDEV_CHANGE:
2643 if (dev->flags & IFF_SLAVE)
2644 break;
2645
2646 if (event == NETDEV_UP) {
2647 if (!addrconf_qdisc_ok(dev)) {
2648 /* device is not ready yet. */
2649 printk(KERN_INFO
2650 "ADDRCONF(NETDEV_UP): %s: "
2651 "link is not ready\n",
2652 dev->name);
2653 break;
2654 }
2655
2656 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2657 idev = ipv6_add_dev(dev);
2658
2659 if (idev) {
2660 idev->if_flags |= IF_READY;
2661 run_pending = 1;
2662 }
2663 } else {
2664 if (!addrconf_qdisc_ok(dev)) {
2665 /* device is still not ready. */
2666 break;
2667 }
2668
2669 if (idev) {
2670 if (idev->if_flags & IF_READY)
2671 /* device is already configured. */
2672 break;
2673 idev->if_flags |= IF_READY;
2674 }
2675
2676 printk(KERN_INFO
2677 "ADDRCONF(NETDEV_CHANGE): %s: "
2678 "link becomes ready\n",
2679 dev->name);
2680
2681 run_pending = 1;
2682 }
2683
2684 switch (dev->type) {
2685 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2686 case ARPHRD_SIT:
2687 addrconf_sit_config(dev);
2688 break;
2689 #endif
2690 #if defined(CONFIG_NET_IPGRE) || defined(CONFIG_NET_IPGRE_MODULE)
2691 case ARPHRD_IPGRE:
2692 addrconf_gre_config(dev);
2693 break;
2694 #endif
2695 case ARPHRD_TUNNEL6:
2696 addrconf_ip6_tnl_config(dev);
2697 break;
2698 case ARPHRD_LOOPBACK:
2699 init_loopback(dev);
2700 break;
2701
2702 default:
2703 addrconf_dev_config(dev);
2704 break;
2705 }
2706
2707 if (idev) {
2708 if (run_pending)
2709 addrconf_dad_run(idev);
2710
2711 /*
2712 * If the MTU changed during the interface down,
2713 * when the interface up, the changed MTU must be
2714 * reflected in the idev as well as routers.
2715 */
2716 if (idev->cnf.mtu6 != dev->mtu &&
2717 dev->mtu >= IPV6_MIN_MTU) {
2718 rt6_mtu_change(dev, dev->mtu);
2719 idev->cnf.mtu6 = dev->mtu;
2720 }
2721 idev->tstamp = jiffies;
2722 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2723
2724 /*
2725 * If the changed mtu during down is lower than
2726 * IPV6_MIN_MTU stop IPv6 on this interface.
2727 */
2728 if (dev->mtu < IPV6_MIN_MTU)
2729 addrconf_ifdown(dev, 1);
2730 }
2731 break;
2732
2733 case NETDEV_CHANGEMTU:
2734 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2735 rt6_mtu_change(dev, dev->mtu);
2736 idev->cnf.mtu6 = dev->mtu;
2737 break;
2738 }
2739
2740 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2741 idev = ipv6_add_dev(dev);
2742 if (idev)
2743 break;
2744 }
2745
2746 /*
2747 * MTU falled under IPV6_MIN_MTU.
2748 * Stop IPv6 on this interface.
2749 */
2750
2751 case NETDEV_DOWN:
2752 case NETDEV_UNREGISTER:
2753 /*
2754 * Remove all addresses from this interface.
2755 */
2756 addrconf_ifdown(dev, event != NETDEV_DOWN);
2757 break;
2758
2759 case NETDEV_CHANGENAME:
2760 if (idev) {
2761 snmp6_unregister_dev(idev);
2762 addrconf_sysctl_unregister(idev);
2763 addrconf_sysctl_register(idev);
2764 err = snmp6_register_dev(idev);
2765 if (err)
2766 return notifier_from_errno(err);
2767 }
2768 break;
2769
2770 case NETDEV_PRE_TYPE_CHANGE:
2771 case NETDEV_POST_TYPE_CHANGE:
2772 addrconf_type_change(dev, event);
2773 break;
2774 }
2775
2776 return NOTIFY_OK;
2777 }
2778
2779 /*
2780 * addrconf module should be notified of a device going up
2781 */
2782 static struct notifier_block ipv6_dev_notf = {
2783 .notifier_call = addrconf_notify,
2784 };
2785
2786 static void addrconf_type_change(struct net_device *dev, unsigned long event)
2787 {
2788 struct inet6_dev *idev;
2789 ASSERT_RTNL();
2790
2791 idev = __in6_dev_get(dev);
2792
2793 if (event == NETDEV_POST_TYPE_CHANGE)
2794 ipv6_mc_remap(idev);
2795 else if (event == NETDEV_PRE_TYPE_CHANGE)
2796 ipv6_mc_unmap(idev);
2797 }
2798
2799 static int addrconf_ifdown(struct net_device *dev, int how)
2800 {
2801 struct net *net = dev_net(dev);
2802 struct inet6_dev *idev;
2803 struct inet6_ifaddr *ifa;
2804 int state, i;
2805
2806 ASSERT_RTNL();
2807
2808 rt6_ifdown(net, dev);
2809 neigh_ifdown(&nd_tbl, dev);
2810
2811 idev = __in6_dev_get(dev);
2812 if (idev == NULL)
2813 return -ENODEV;
2814
2815 /*
2816 * Step 1: remove reference to ipv6 device from parent device.
2817 * Do not dev_put!
2818 */
2819 if (how) {
2820 idev->dead = 1;
2821
2822 /* protected by rtnl_lock */
2823 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
2824
2825 /* Step 1.5: remove snmp6 entry */
2826 snmp6_unregister_dev(idev);
2827
2828 }
2829
2830 /* Step 2: clear hash table */
2831 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
2832 struct hlist_head *h = &inet6_addr_lst[i];
2833 struct hlist_node *n;
2834
2835 spin_lock_bh(&addrconf_hash_lock);
2836 restart:
2837 hlist_for_each_entry_rcu(ifa, n, h, addr_lst) {
2838 if (ifa->idev == idev) {
2839 hlist_del_init_rcu(&ifa->addr_lst);
2840 addrconf_del_timer(ifa);
2841 goto restart;
2842 }
2843 }
2844 spin_unlock_bh(&addrconf_hash_lock);
2845 }
2846
2847 write_lock_bh(&idev->lock);
2848
2849 /* Step 2: clear flags for stateless addrconf */
2850 if (!how)
2851 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2852
2853 #ifdef CONFIG_IPV6_PRIVACY
2854 if (how && del_timer(&idev->regen_timer))
2855 in6_dev_put(idev);
2856
2857 /* Step 3: clear tempaddr list */
2858 while (!list_empty(&idev->tempaddr_list)) {
2859 ifa = list_first_entry(&idev->tempaddr_list,
2860 struct inet6_ifaddr, tmp_list);
2861 list_del(&ifa->tmp_list);
2862 write_unlock_bh(&idev->lock);
2863 spin_lock_bh(&ifa->lock);
2864
2865 if (ifa->ifpub) {
2866 in6_ifa_put(ifa->ifpub);
2867 ifa->ifpub = NULL;
2868 }
2869 spin_unlock_bh(&ifa->lock);
2870 in6_ifa_put(ifa);
2871 write_lock_bh(&idev->lock);
2872 }
2873 #endif
2874
2875 while (!list_empty(&idev->addr_list)) {
2876 ifa = list_first_entry(&idev->addr_list,
2877 struct inet6_ifaddr, if_list);
2878 addrconf_del_timer(ifa);
2879
2880 list_del(&ifa->if_list);
2881
2882 write_unlock_bh(&idev->lock);
2883
2884 spin_lock_bh(&ifa->state_lock);
2885 state = ifa->state;
2886 ifa->state = INET6_IFADDR_STATE_DEAD;
2887 spin_unlock_bh(&ifa->state_lock);
2888
2889 if (state != INET6_IFADDR_STATE_DEAD) {
2890 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2891 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2892 }
2893 in6_ifa_put(ifa);
2894
2895 write_lock_bh(&idev->lock);
2896 }
2897
2898 write_unlock_bh(&idev->lock);
2899
2900 /* Step 5: Discard multicast list */
2901 if (how)
2902 ipv6_mc_destroy_dev(idev);
2903 else
2904 ipv6_mc_down(idev);
2905
2906 idev->tstamp = jiffies;
2907
2908 /* Last: Shot the device (if unregistered) */
2909 if (how) {
2910 addrconf_sysctl_unregister(idev);
2911 neigh_parms_release(&nd_tbl, idev->nd_parms);
2912 neigh_ifdown(&nd_tbl, dev);
2913 in6_dev_put(idev);
2914 }
2915 return 0;
2916 }
2917
2918 static void addrconf_rs_timer(unsigned long data)
2919 {
2920 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2921 struct inet6_dev *idev = ifp->idev;
2922
2923 read_lock(&idev->lock);
2924 if (idev->dead || !(idev->if_flags & IF_READY))
2925 goto out;
2926
2927 if (idev->cnf.forwarding)
2928 goto out;
2929
2930 /* Announcement received after solicitation was sent */
2931 if (idev->if_flags & IF_RA_RCVD)
2932 goto out;
2933
2934 spin_lock(&ifp->lock);
2935 if (ifp->probes++ < idev->cnf.rtr_solicits) {
2936 /* The wait after the last probe can be shorter */
2937 addrconf_mod_timer(ifp, AC_RS,
2938 (ifp->probes == idev->cnf.rtr_solicits) ?
2939 idev->cnf.rtr_solicit_delay :
2940 idev->cnf.rtr_solicit_interval);
2941 spin_unlock(&ifp->lock);
2942
2943 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2944 } else {
2945 spin_unlock(&ifp->lock);
2946 /*
2947 * Note: we do not support deprecated "all on-link"
2948 * assumption any longer.
2949 */
2950 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2951 idev->dev->name);
2952 }
2953
2954 out:
2955 read_unlock(&idev->lock);
2956 in6_ifa_put(ifp);
2957 }
2958
2959 /*
2960 * Duplicate Address Detection
2961 */
2962 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2963 {
2964 unsigned long rand_num;
2965 struct inet6_dev *idev = ifp->idev;
2966
2967 if (ifp->flags & IFA_F_OPTIMISTIC)
2968 rand_num = 0;
2969 else
2970 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2971
2972 ifp->probes = idev->cnf.dad_transmits;
2973 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2974 }
2975
2976 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2977 {
2978 struct inet6_dev *idev = ifp->idev;
2979 struct net_device *dev = idev->dev;
2980
2981 addrconf_join_solict(dev, &ifp->addr);
2982
2983 net_srandom(ifp->addr.s6_addr32[3]);
2984
2985 read_lock_bh(&idev->lock);
2986 spin_lock(&ifp->lock);
2987 if (ifp->state == INET6_IFADDR_STATE_DEAD)
2988 goto out;
2989
2990 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2991 idev->cnf.accept_dad < 1 ||
2992 !(ifp->flags&IFA_F_TENTATIVE) ||
2993 ifp->flags & IFA_F_NODAD) {
2994 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
2995 spin_unlock(&ifp->lock);
2996 read_unlock_bh(&idev->lock);
2997
2998 addrconf_dad_completed(ifp);
2999 return;
3000 }
3001
3002 if (!(idev->if_flags & IF_READY)) {
3003 spin_unlock(&ifp->lock);
3004 read_unlock_bh(&idev->lock);
3005 /*
3006 * If the device is not ready:
3007 * - keep it tentative if it is a permanent address.
3008 * - otherwise, kill it.
3009 */
3010 in6_ifa_hold(ifp);
3011 addrconf_dad_stop(ifp, 0);
3012 return;
3013 }
3014
3015 /*
3016 * Optimistic nodes can start receiving
3017 * Frames right away
3018 */
3019 if (ifp->flags & IFA_F_OPTIMISTIC)
3020 ip6_ins_rt(ifp->rt);
3021
3022 addrconf_dad_kick(ifp);
3023 out:
3024 spin_unlock(&ifp->lock);
3025 read_unlock_bh(&idev->lock);
3026 }
3027
3028 static void addrconf_dad_timer(unsigned long data)
3029 {
3030 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
3031 struct inet6_dev *idev = ifp->idev;
3032 struct in6_addr mcaddr;
3033
3034 if (!ifp->probes && addrconf_dad_end(ifp))
3035 goto out;
3036
3037 read_lock(&idev->lock);
3038 if (idev->dead || !(idev->if_flags & IF_READY)) {
3039 read_unlock(&idev->lock);
3040 goto out;
3041 }
3042
3043 spin_lock(&ifp->lock);
3044 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3045 spin_unlock(&ifp->lock);
3046 read_unlock(&idev->lock);
3047 goto out;
3048 }
3049
3050 if (ifp->probes == 0) {
3051 /*
3052 * DAD was successful
3053 */
3054
3055 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3056 spin_unlock(&ifp->lock);
3057 read_unlock(&idev->lock);
3058
3059 addrconf_dad_completed(ifp);
3060
3061 goto out;
3062 }
3063
3064 ifp->probes--;
3065 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
3066 spin_unlock(&ifp->lock);
3067 read_unlock(&idev->lock);
3068
3069 /* send a neighbour solicitation for our addr */
3070 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3071 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
3072 out:
3073 in6_ifa_put(ifp);
3074 }
3075
3076 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3077 {
3078 struct net_device *dev = ifp->idev->dev;
3079
3080 /*
3081 * Configure the address for reception. Now it is valid.
3082 */
3083
3084 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3085
3086 /* If added prefix is link local and we are prepared to process
3087 router advertisements, start sending router solicitations.
3088 */
3089
3090 if (((ifp->idev->cnf.accept_ra == 1 && !ifp->idev->cnf.forwarding) ||
3091 ifp->idev->cnf.accept_ra == 2) &&
3092 ifp->idev->cnf.rtr_solicits > 0 &&
3093 (dev->flags&IFF_LOOPBACK) == 0 &&
3094 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
3095 /*
3096 * If a host as already performed a random delay
3097 * [...] as part of DAD [...] there is no need
3098 * to delay again before sending the first RS
3099 */
3100 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
3101
3102 spin_lock_bh(&ifp->lock);
3103 ifp->probes = 1;
3104 ifp->idev->if_flags |= IF_RS_SENT;
3105 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
3106 spin_unlock_bh(&ifp->lock);
3107 }
3108 }
3109
3110 static void addrconf_dad_run(struct inet6_dev *idev)
3111 {
3112 struct inet6_ifaddr *ifp;
3113
3114 read_lock_bh(&idev->lock);
3115 list_for_each_entry(ifp, &idev->addr_list, if_list) {
3116 spin_lock(&ifp->lock);
3117 if (ifp->flags & IFA_F_TENTATIVE &&
3118 ifp->state == INET6_IFADDR_STATE_DAD)
3119 addrconf_dad_kick(ifp);
3120 spin_unlock(&ifp->lock);
3121 }
3122 read_unlock_bh(&idev->lock);
3123 }
3124
3125 #ifdef CONFIG_PROC_FS
3126 struct if6_iter_state {
3127 struct seq_net_private p;
3128 int bucket;
3129 int offset;
3130 };
3131
3132 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
3133 {
3134 struct inet6_ifaddr *ifa = NULL;
3135 struct if6_iter_state *state = seq->private;
3136 struct net *net = seq_file_net(seq);
3137 int p = 0;
3138
3139 /* initial bucket if pos is 0 */
3140 if (pos == 0) {
3141 state->bucket = 0;
3142 state->offset = 0;
3143 }
3144
3145 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3146 struct hlist_node *n;
3147 hlist_for_each_entry_rcu_bh(ifa, n, &inet6_addr_lst[state->bucket],
3148 addr_lst) {
3149 if (!net_eq(dev_net(ifa->idev->dev), net))
3150 continue;
3151 /* sync with offset */
3152 if (p < state->offset) {
3153 p++;
3154 continue;
3155 }
3156 state->offset++;
3157 return ifa;
3158 }
3159
3160 /* prepare for next bucket */
3161 state->offset = 0;
3162 p = 0;
3163 }
3164 return NULL;
3165 }
3166
3167 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3168 struct inet6_ifaddr *ifa)
3169 {
3170 struct if6_iter_state *state = seq->private;
3171 struct net *net = seq_file_net(seq);
3172 struct hlist_node *n = &ifa->addr_lst;
3173
3174 hlist_for_each_entry_continue_rcu_bh(ifa, n, addr_lst) {
3175 if (!net_eq(dev_net(ifa->idev->dev), net))
3176 continue;
3177 state->offset++;
3178 return ifa;
3179 }
3180
3181 while (++state->bucket < IN6_ADDR_HSIZE) {
3182 state->offset = 0;
3183 hlist_for_each_entry_rcu_bh(ifa, n,
3184 &inet6_addr_lst[state->bucket], addr_lst) {
3185 if (!net_eq(dev_net(ifa->idev->dev), net))
3186 continue;
3187 state->offset++;
3188 return ifa;
3189 }
3190 }
3191
3192 return NULL;
3193 }
3194
3195 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3196 __acquires(rcu_bh)
3197 {
3198 rcu_read_lock_bh();
3199 return if6_get_first(seq, *pos);
3200 }
3201
3202 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3203 {
3204 struct inet6_ifaddr *ifa;
3205
3206 ifa = if6_get_next(seq, v);
3207 ++*pos;
3208 return ifa;
3209 }
3210
3211 static void if6_seq_stop(struct seq_file *seq, void *v)
3212 __releases(rcu_bh)
3213 {
3214 rcu_read_unlock_bh();
3215 }
3216
3217 static int if6_seq_show(struct seq_file *seq, void *v)
3218 {
3219 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3220 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3221 &ifp->addr,
3222 ifp->idev->dev->ifindex,
3223 ifp->prefix_len,
3224 ifp->scope,
3225 ifp->flags,
3226 ifp->idev->dev->name);
3227 return 0;
3228 }
3229
3230 static const struct seq_operations if6_seq_ops = {
3231 .start = if6_seq_start,
3232 .next = if6_seq_next,
3233 .show = if6_seq_show,
3234 .stop = if6_seq_stop,
3235 };
3236
3237 static int if6_seq_open(struct inode *inode, struct file *file)
3238 {
3239 return seq_open_net(inode, file, &if6_seq_ops,
3240 sizeof(struct if6_iter_state));
3241 }
3242
3243 static const struct file_operations if6_fops = {
3244 .owner = THIS_MODULE,
3245 .open = if6_seq_open,
3246 .read = seq_read,
3247 .llseek = seq_lseek,
3248 .release = seq_release_net,
3249 };
3250
3251 static int __net_init if6_proc_net_init(struct net *net)
3252 {
3253 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
3254 return -ENOMEM;
3255 return 0;
3256 }
3257
3258 static void __net_exit if6_proc_net_exit(struct net *net)
3259 {
3260 proc_net_remove(net, "if_inet6");
3261 }
3262
3263 static struct pernet_operations if6_proc_net_ops = {
3264 .init = if6_proc_net_init,
3265 .exit = if6_proc_net_exit,
3266 };
3267
3268 int __init if6_proc_init(void)
3269 {
3270 return register_pernet_subsys(&if6_proc_net_ops);
3271 }
3272
3273 void if6_proc_exit(void)
3274 {
3275 unregister_pernet_subsys(&if6_proc_net_ops);
3276 }
3277 #endif /* CONFIG_PROC_FS */
3278
3279 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3280 /* Check if address is a home address configured on any interface. */
3281 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3282 {
3283 int ret = 0;
3284 struct inet6_ifaddr *ifp = NULL;
3285 struct hlist_node *n;
3286 unsigned int hash = ipv6_addr_hash(addr);
3287
3288 rcu_read_lock_bh();
3289 hlist_for_each_entry_rcu_bh(ifp, n, &inet6_addr_lst[hash], addr_lst) {
3290 if (!net_eq(dev_net(ifp->idev->dev), net))
3291 continue;
3292 if (ipv6_addr_equal(&ifp->addr, addr) &&
3293 (ifp->flags & IFA_F_HOMEADDRESS)) {
3294 ret = 1;
3295 break;
3296 }
3297 }
3298 rcu_read_unlock_bh();
3299 return ret;
3300 }
3301 #endif
3302
3303 /*
3304 * Periodic address status verification
3305 */
3306
3307 static void addrconf_verify(unsigned long foo)
3308 {
3309 unsigned long now, next, next_sec, next_sched;
3310 struct inet6_ifaddr *ifp;
3311 struct hlist_node *node;
3312 int i;
3313
3314 rcu_read_lock_bh();
3315 spin_lock(&addrconf_verify_lock);
3316 now = jiffies;
3317 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3318
3319 del_timer(&addr_chk_timer);
3320
3321 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3322 restart:
3323 hlist_for_each_entry_rcu_bh(ifp, node,
3324 &inet6_addr_lst[i], addr_lst) {
3325 unsigned long age;
3326
3327 if (ifp->flags & IFA_F_PERMANENT)
3328 continue;
3329
3330 spin_lock(&ifp->lock);
3331 /* We try to batch several events at once. */
3332 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3333
3334 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3335 age >= ifp->valid_lft) {
3336 spin_unlock(&ifp->lock);
3337 in6_ifa_hold(ifp);
3338 ipv6_del_addr(ifp);
3339 goto restart;
3340 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3341 spin_unlock(&ifp->lock);
3342 continue;
3343 } else if (age >= ifp->prefered_lft) {
3344 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3345 int deprecate = 0;
3346
3347 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3348 deprecate = 1;
3349 ifp->flags |= IFA_F_DEPRECATED;
3350 }
3351
3352 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3353 next = ifp->tstamp + ifp->valid_lft * HZ;
3354
3355 spin_unlock(&ifp->lock);
3356
3357 if (deprecate) {
3358 in6_ifa_hold(ifp);
3359
3360 ipv6_ifa_notify(0, ifp);
3361 in6_ifa_put(ifp);
3362 goto restart;
3363 }
3364 #ifdef CONFIG_IPV6_PRIVACY
3365 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3366 !(ifp->flags&IFA_F_TENTATIVE)) {
3367 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3368 ifp->idev->cnf.dad_transmits *
3369 ifp->idev->nd_parms->retrans_time / HZ;
3370
3371 if (age >= ifp->prefered_lft - regen_advance) {
3372 struct inet6_ifaddr *ifpub = ifp->ifpub;
3373 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3374 next = ifp->tstamp + ifp->prefered_lft * HZ;
3375 if (!ifp->regen_count && ifpub) {
3376 ifp->regen_count++;
3377 in6_ifa_hold(ifp);
3378 in6_ifa_hold(ifpub);
3379 spin_unlock(&ifp->lock);
3380
3381 spin_lock(&ifpub->lock);
3382 ifpub->regen_count = 0;
3383 spin_unlock(&ifpub->lock);
3384 ipv6_create_tempaddr(ifpub, ifp);
3385 in6_ifa_put(ifpub);
3386 in6_ifa_put(ifp);
3387 goto restart;
3388 }
3389 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3390 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3391 spin_unlock(&ifp->lock);
3392 #endif
3393 } else {
3394 /* ifp->prefered_lft <= ifp->valid_lft */
3395 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3396 next = ifp->tstamp + ifp->prefered_lft * HZ;
3397 spin_unlock(&ifp->lock);
3398 }
3399 }
3400 }
3401
3402 next_sec = round_jiffies_up(next);
3403 next_sched = next;
3404
3405 /* If rounded timeout is accurate enough, accept it. */
3406 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3407 next_sched = next_sec;
3408
3409 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3410 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3411 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3412
3413 ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3414 now, next, next_sec, next_sched));
3415
3416 addr_chk_timer.expires = next_sched;
3417 add_timer(&addr_chk_timer);
3418 spin_unlock(&addrconf_verify_lock);
3419 rcu_read_unlock_bh();
3420 }
3421
3422 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3423 {
3424 struct in6_addr *pfx = NULL;
3425
3426 if (addr)
3427 pfx = nla_data(addr);
3428
3429 if (local) {
3430 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3431 pfx = NULL;
3432 else
3433 pfx = nla_data(local);
3434 }
3435
3436 return pfx;
3437 }
3438
3439 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3440 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3441 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3442 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3443 };
3444
3445 static int
3446 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3447 {
3448 struct net *net = sock_net(skb->sk);
3449 struct ifaddrmsg *ifm;
3450 struct nlattr *tb[IFA_MAX+1];
3451 struct in6_addr *pfx;
3452 int err;
3453
3454 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3455 if (err < 0)
3456 return err;
3457
3458 ifm = nlmsg_data(nlh);
3459 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3460 if (pfx == NULL)
3461 return -EINVAL;
3462
3463 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3464 }
3465
3466 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3467 u32 prefered_lft, u32 valid_lft)
3468 {
3469 u32 flags;
3470 clock_t expires;
3471 unsigned long timeout;
3472
3473 if (!valid_lft || (prefered_lft > valid_lft))
3474 return -EINVAL;
3475
3476 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3477 if (addrconf_finite_timeout(timeout)) {
3478 expires = jiffies_to_clock_t(timeout * HZ);
3479 valid_lft = timeout;
3480 flags = RTF_EXPIRES;
3481 } else {
3482 expires = 0;
3483 flags = 0;
3484 ifa_flags |= IFA_F_PERMANENT;
3485 }
3486
3487 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3488 if (addrconf_finite_timeout(timeout)) {
3489 if (timeout == 0)
3490 ifa_flags |= IFA_F_DEPRECATED;
3491 prefered_lft = timeout;
3492 }
3493
3494 spin_lock_bh(&ifp->lock);
3495 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3496 ifp->tstamp = jiffies;
3497 ifp->valid_lft = valid_lft;
3498 ifp->prefered_lft = prefered_lft;
3499
3500 spin_unlock_bh(&ifp->lock);
3501 if (!(ifp->flags&IFA_F_TENTATIVE))
3502 ipv6_ifa_notify(0, ifp);
3503
3504 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3505 expires, flags);
3506 addrconf_verify(0);
3507
3508 return 0;
3509 }
3510
3511 static int
3512 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3513 {
3514 struct net *net = sock_net(skb->sk);
3515 struct ifaddrmsg *ifm;
3516 struct nlattr *tb[IFA_MAX+1];
3517 struct in6_addr *pfx;
3518 struct inet6_ifaddr *ifa;
3519 struct net_device *dev;
3520 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3521 u8 ifa_flags;
3522 int err;
3523
3524 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3525 if (err < 0)
3526 return err;
3527
3528 ifm = nlmsg_data(nlh);
3529 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3530 if (pfx == NULL)
3531 return -EINVAL;
3532
3533 if (tb[IFA_CACHEINFO]) {
3534 struct ifa_cacheinfo *ci;
3535
3536 ci = nla_data(tb[IFA_CACHEINFO]);
3537 valid_lft = ci->ifa_valid;
3538 preferred_lft = ci->ifa_prefered;
3539 } else {
3540 preferred_lft = INFINITY_LIFE_TIME;
3541 valid_lft = INFINITY_LIFE_TIME;
3542 }
3543
3544 dev = __dev_get_by_index(net, ifm->ifa_index);
3545 if (dev == NULL)
3546 return -ENODEV;
3547
3548 /* We ignore other flags so far. */
3549 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3550
3551 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3552 if (ifa == NULL) {
3553 /*
3554 * It would be best to check for !NLM_F_CREATE here but
3555 * userspace alreay relies on not having to provide this.
3556 */
3557 return inet6_addr_add(net, ifm->ifa_index, pfx,
3558 ifm->ifa_prefixlen, ifa_flags,
3559 preferred_lft, valid_lft);
3560 }
3561
3562 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3563 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3564 err = -EEXIST;
3565 else
3566 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3567
3568 in6_ifa_put(ifa);
3569
3570 return err;
3571 }
3572
3573 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3574 u8 scope, int ifindex)
3575 {
3576 struct ifaddrmsg *ifm;
3577
3578 ifm = nlmsg_data(nlh);
3579 ifm->ifa_family = AF_INET6;
3580 ifm->ifa_prefixlen = prefixlen;
3581 ifm->ifa_flags = flags;
3582 ifm->ifa_scope = scope;
3583 ifm->ifa_index = ifindex;
3584 }
3585
3586 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3587 unsigned long tstamp, u32 preferred, u32 valid)
3588 {
3589 struct ifa_cacheinfo ci;
3590
3591 ci.cstamp = cstamp_delta(cstamp);
3592 ci.tstamp = cstamp_delta(tstamp);
3593 ci.ifa_prefered = preferred;
3594 ci.ifa_valid = valid;
3595
3596 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3597 }
3598
3599 static inline int rt_scope(int ifa_scope)
3600 {
3601 if (ifa_scope & IFA_HOST)
3602 return RT_SCOPE_HOST;
3603 else if (ifa_scope & IFA_LINK)
3604 return RT_SCOPE_LINK;
3605 else if (ifa_scope & IFA_SITE)
3606 return RT_SCOPE_SITE;
3607 else
3608 return RT_SCOPE_UNIVERSE;
3609 }
3610
3611 static inline int inet6_ifaddr_msgsize(void)
3612 {
3613 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3614 + nla_total_size(16) /* IFA_ADDRESS */
3615 + nla_total_size(sizeof(struct ifa_cacheinfo));
3616 }
3617
3618 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3619 u32 pid, u32 seq, int event, unsigned int flags)
3620 {
3621 struct nlmsghdr *nlh;
3622 u32 preferred, valid;
3623
3624 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3625 if (nlh == NULL)
3626 return -EMSGSIZE;
3627
3628 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3629 ifa->idev->dev->ifindex);
3630
3631 if (!(ifa->flags&IFA_F_PERMANENT)) {
3632 preferred = ifa->prefered_lft;
3633 valid = ifa->valid_lft;
3634 if (preferred != INFINITY_LIFE_TIME) {
3635 long tval = (jiffies - ifa->tstamp)/HZ;
3636 if (preferred > tval)
3637 preferred -= tval;
3638 else
3639 preferred = 0;
3640 if (valid != INFINITY_LIFE_TIME) {
3641 if (valid > tval)
3642 valid -= tval;
3643 else
3644 valid = 0;
3645 }
3646 }
3647 } else {
3648 preferred = INFINITY_LIFE_TIME;
3649 valid = INFINITY_LIFE_TIME;
3650 }
3651
3652 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3653 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3654 nlmsg_cancel(skb, nlh);
3655 return -EMSGSIZE;
3656 }
3657
3658 return nlmsg_end(skb, nlh);
3659 }
3660
3661 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3662 u32 pid, u32 seq, int event, u16 flags)
3663 {
3664 struct nlmsghdr *nlh;
3665 u8 scope = RT_SCOPE_UNIVERSE;
3666 int ifindex = ifmca->idev->dev->ifindex;
3667
3668 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3669 scope = RT_SCOPE_SITE;
3670
3671 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3672 if (nlh == NULL)
3673 return -EMSGSIZE;
3674
3675 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3676 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3677 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3678 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3679 nlmsg_cancel(skb, nlh);
3680 return -EMSGSIZE;
3681 }
3682
3683 return nlmsg_end(skb, nlh);
3684 }
3685
3686 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3687 u32 pid, u32 seq, int event, unsigned int flags)
3688 {
3689 struct nlmsghdr *nlh;
3690 u8 scope = RT_SCOPE_UNIVERSE;
3691 int ifindex = ifaca->aca_idev->dev->ifindex;
3692
3693 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3694 scope = RT_SCOPE_SITE;
3695
3696 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3697 if (nlh == NULL)
3698 return -EMSGSIZE;
3699
3700 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3701 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3702 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3703 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3704 nlmsg_cancel(skb, nlh);
3705 return -EMSGSIZE;
3706 }
3707
3708 return nlmsg_end(skb, nlh);
3709 }
3710
3711 enum addr_type_t {
3712 UNICAST_ADDR,
3713 MULTICAST_ADDR,
3714 ANYCAST_ADDR,
3715 };
3716
3717 /* called with rcu_read_lock() */
3718 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3719 struct netlink_callback *cb, enum addr_type_t type,
3720 int s_ip_idx, int *p_ip_idx)
3721 {
3722 struct ifmcaddr6 *ifmca;
3723 struct ifacaddr6 *ifaca;
3724 int err = 1;
3725 int ip_idx = *p_ip_idx;
3726
3727 read_lock_bh(&idev->lock);
3728 switch (type) {
3729 case UNICAST_ADDR: {
3730 struct inet6_ifaddr *ifa;
3731
3732 /* unicast address incl. temp addr */
3733 list_for_each_entry(ifa, &idev->addr_list, if_list) {
3734 if (++ip_idx < s_ip_idx)
3735 continue;
3736 err = inet6_fill_ifaddr(skb, ifa,
3737 NETLINK_CB(cb->skb).pid,
3738 cb->nlh->nlmsg_seq,
3739 RTM_NEWADDR,
3740 NLM_F_MULTI);
3741 if (err <= 0)
3742 break;
3743 }
3744 break;
3745 }
3746 case MULTICAST_ADDR:
3747 /* multicast address */
3748 for (ifmca = idev->mc_list; ifmca;
3749 ifmca = ifmca->next, ip_idx++) {
3750 if (ip_idx < s_ip_idx)
3751 continue;
3752 err = inet6_fill_ifmcaddr(skb, ifmca,
3753 NETLINK_CB(cb->skb).pid,
3754 cb->nlh->nlmsg_seq,
3755 RTM_GETMULTICAST,
3756 NLM_F_MULTI);
3757 if (err <= 0)
3758 break;
3759 }
3760 break;
3761 case ANYCAST_ADDR:
3762 /* anycast address */
3763 for (ifaca = idev->ac_list; ifaca;
3764 ifaca = ifaca->aca_next, ip_idx++) {
3765 if (ip_idx < s_ip_idx)
3766 continue;
3767 err = inet6_fill_ifacaddr(skb, ifaca,
3768 NETLINK_CB(cb->skb).pid,
3769 cb->nlh->nlmsg_seq,
3770 RTM_GETANYCAST,
3771 NLM_F_MULTI);
3772 if (err <= 0)
3773 break;
3774 }
3775 break;
3776 default:
3777 break;
3778 }
3779 read_unlock_bh(&idev->lock);
3780 *p_ip_idx = ip_idx;
3781 return err;
3782 }
3783
3784 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3785 enum addr_type_t type)
3786 {
3787 struct net *net = sock_net(skb->sk);
3788 int h, s_h;
3789 int idx, ip_idx;
3790 int s_idx, s_ip_idx;
3791 struct net_device *dev;
3792 struct inet6_dev *idev;
3793 struct hlist_head *head;
3794 struct hlist_node *node;
3795
3796 s_h = cb->args[0];
3797 s_idx = idx = cb->args[1];
3798 s_ip_idx = ip_idx = cb->args[2];
3799
3800 rcu_read_lock();
3801 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3802 idx = 0;
3803 head = &net->dev_index_head[h];
3804 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3805 if (idx < s_idx)
3806 goto cont;
3807 if (h > s_h || idx > s_idx)
3808 s_ip_idx = 0;
3809 ip_idx = 0;
3810 idev = __in6_dev_get(dev);
3811 if (!idev)
3812 goto cont;
3813
3814 if (in6_dump_addrs(idev, skb, cb, type,
3815 s_ip_idx, &ip_idx) <= 0)
3816 goto done;
3817 cont:
3818 idx++;
3819 }
3820 }
3821 done:
3822 rcu_read_unlock();
3823 cb->args[0] = h;
3824 cb->args[1] = idx;
3825 cb->args[2] = ip_idx;
3826
3827 return skb->len;
3828 }
3829
3830 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3831 {
3832 enum addr_type_t type = UNICAST_ADDR;
3833
3834 return inet6_dump_addr(skb, cb, type);
3835 }
3836
3837 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3838 {
3839 enum addr_type_t type = MULTICAST_ADDR;
3840
3841 return inet6_dump_addr(skb, cb, type);
3842 }
3843
3844
3845 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3846 {
3847 enum addr_type_t type = ANYCAST_ADDR;
3848
3849 return inet6_dump_addr(skb, cb, type);
3850 }
3851
3852 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3853 void *arg)
3854 {
3855 struct net *net = sock_net(in_skb->sk);
3856 struct ifaddrmsg *ifm;
3857 struct nlattr *tb[IFA_MAX+1];
3858 struct in6_addr *addr = NULL;
3859 struct net_device *dev = NULL;
3860 struct inet6_ifaddr *ifa;
3861 struct sk_buff *skb;
3862 int err;
3863
3864 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3865 if (err < 0)
3866 goto errout;
3867
3868 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3869 if (addr == NULL) {
3870 err = -EINVAL;
3871 goto errout;
3872 }
3873
3874 ifm = nlmsg_data(nlh);
3875 if (ifm->ifa_index)
3876 dev = __dev_get_by_index(net, ifm->ifa_index);
3877
3878 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
3879 if (!ifa) {
3880 err = -EADDRNOTAVAIL;
3881 goto errout;
3882 }
3883
3884 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
3885 if (!skb) {
3886 err = -ENOBUFS;
3887 goto errout_ifa;
3888 }
3889
3890 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3891 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3892 if (err < 0) {
3893 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3894 WARN_ON(err == -EMSGSIZE);
3895 kfree_skb(skb);
3896 goto errout_ifa;
3897 }
3898 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
3899 errout_ifa:
3900 in6_ifa_put(ifa);
3901 errout:
3902 return err;
3903 }
3904
3905 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3906 {
3907 struct sk_buff *skb;
3908 struct net *net = dev_net(ifa->idev->dev);
3909 int err = -ENOBUFS;
3910
3911 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3912 if (skb == NULL)
3913 goto errout;
3914
3915 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3916 if (err < 0) {
3917 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3918 WARN_ON(err == -EMSGSIZE);
3919 kfree_skb(skb);
3920 goto errout;
3921 }
3922 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3923 return;
3924 errout:
3925 if (err < 0)
3926 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3927 }
3928
3929 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3930 __s32 *array, int bytes)
3931 {
3932 BUG_ON(bytes < (DEVCONF_MAX * 4));
3933
3934 memset(array, 0, bytes);
3935 array[DEVCONF_FORWARDING] = cnf->forwarding;
3936 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3937 array[DEVCONF_MTU6] = cnf->mtu6;
3938 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3939 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3940 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3941 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3942 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3943 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
3944 jiffies_to_msecs(cnf->rtr_solicit_interval);
3945 array[DEVCONF_RTR_SOLICIT_DELAY] =
3946 jiffies_to_msecs(cnf->rtr_solicit_delay);
3947 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3948 #ifdef CONFIG_IPV6_PRIVACY
3949 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3950 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3951 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3952 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3953 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3954 #endif
3955 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3956 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3957 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3958 #ifdef CONFIG_IPV6_ROUTER_PREF
3959 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3960 array[DEVCONF_RTR_PROBE_INTERVAL] =
3961 jiffies_to_msecs(cnf->rtr_probe_interval);
3962 #ifdef CONFIG_IPV6_ROUTE_INFO
3963 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3964 #endif
3965 #endif
3966 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3967 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3968 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3969 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3970 #endif
3971 #ifdef CONFIG_IPV6_MROUTE
3972 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
3973 #endif
3974 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
3975 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
3976 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
3977 }
3978
3979 static inline size_t inet6_ifla6_size(void)
3980 {
3981 return nla_total_size(4) /* IFLA_INET6_FLAGS */
3982 + nla_total_size(sizeof(struct ifla_cacheinfo))
3983 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3984 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3985 + nla_total_size(ICMP6_MIB_MAX * 8); /* IFLA_INET6_ICMP6STATS */
3986 }
3987
3988 static inline size_t inet6_if_nlmsg_size(void)
3989 {
3990 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3991 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3992 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3993 + nla_total_size(4) /* IFLA_MTU */
3994 + nla_total_size(4) /* IFLA_LINK */
3995 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
3996 }
3997
3998 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
3999 int items, int bytes)
4000 {
4001 int i;
4002 int pad = bytes - sizeof(u64) * items;
4003 BUG_ON(pad < 0);
4004
4005 /* Use put_unaligned() because stats may not be aligned for u64. */
4006 put_unaligned(items, &stats[0]);
4007 for (i = 1; i < items; i++)
4008 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
4009
4010 memset(&stats[items], 0, pad);
4011 }
4012
4013 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib,
4014 int items, int bytes, size_t syncpoff)
4015 {
4016 int i;
4017 int pad = bytes - sizeof(u64) * items;
4018 BUG_ON(pad < 0);
4019
4020 /* Use put_unaligned() because stats may not be aligned for u64. */
4021 put_unaligned(items, &stats[0]);
4022 for (i = 1; i < items; i++)
4023 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
4024
4025 memset(&stats[items], 0, pad);
4026 }
4027
4028 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4029 int bytes)
4030 {
4031 switch (attrtype) {
4032 case IFLA_INET6_STATS:
4033 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6,
4034 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
4035 break;
4036 case IFLA_INET6_ICMP6STATS:
4037 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
4038 break;
4039 }
4040 }
4041
4042 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
4043 {
4044 struct nlattr *nla;
4045 struct ifla_cacheinfo ci;
4046
4047 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
4048
4049 ci.max_reasm_len = IPV6_MAXPLEN;
4050 ci.tstamp = cstamp_delta(idev->tstamp);
4051 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
4052 ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time);
4053 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
4054
4055 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
4056 if (nla == NULL)
4057 goto nla_put_failure;
4058 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4059
4060 /* XXX - MC not implemented */
4061
4062 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4063 if (nla == NULL)
4064 goto nla_put_failure;
4065 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4066
4067 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4068 if (nla == NULL)
4069 goto nla_put_failure;
4070 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4071
4072 return 0;
4073
4074 nla_put_failure:
4075 return -EMSGSIZE;
4076 }
4077
4078 static size_t inet6_get_link_af_size(const struct net_device *dev)
4079 {
4080 if (!__in6_dev_get(dev))
4081 return 0;
4082
4083 return inet6_ifla6_size();
4084 }
4085
4086 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
4087 {
4088 struct inet6_dev *idev = __in6_dev_get(dev);
4089
4090 if (!idev)
4091 return -ENODATA;
4092
4093 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4094 return -EMSGSIZE;
4095
4096 return 0;
4097 }
4098
4099 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
4100 u32 pid, u32 seq, int event, unsigned int flags)
4101 {
4102 struct net_device *dev = idev->dev;
4103 struct ifinfomsg *hdr;
4104 struct nlmsghdr *nlh;
4105 void *protoinfo;
4106
4107 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
4108 if (nlh == NULL)
4109 return -EMSGSIZE;
4110
4111 hdr = nlmsg_data(nlh);
4112 hdr->ifi_family = AF_INET6;
4113 hdr->__ifi_pad = 0;
4114 hdr->ifi_type = dev->type;
4115 hdr->ifi_index = dev->ifindex;
4116 hdr->ifi_flags = dev_get_flags(dev);
4117 hdr->ifi_change = 0;
4118
4119 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
4120
4121 if (dev->addr_len)
4122 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
4123
4124 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
4125 if (dev->ifindex != dev->iflink)
4126 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
4127
4128 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4129 if (protoinfo == NULL)
4130 goto nla_put_failure;
4131
4132 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4133 goto nla_put_failure;
4134
4135 nla_nest_end(skb, protoinfo);
4136 return nlmsg_end(skb, nlh);
4137
4138 nla_put_failure:
4139 nlmsg_cancel(skb, nlh);
4140 return -EMSGSIZE;
4141 }
4142
4143 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4144 {
4145 struct net *net = sock_net(skb->sk);
4146 int h, s_h;
4147 int idx = 0, s_idx;
4148 struct net_device *dev;
4149 struct inet6_dev *idev;
4150 struct hlist_head *head;
4151 struct hlist_node *node;
4152
4153 s_h = cb->args[0];
4154 s_idx = cb->args[1];
4155
4156 rcu_read_lock();
4157 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4158 idx = 0;
4159 head = &net->dev_index_head[h];
4160 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
4161 if (idx < s_idx)
4162 goto cont;
4163 idev = __in6_dev_get(dev);
4164 if (!idev)
4165 goto cont;
4166 if (inet6_fill_ifinfo(skb, idev,
4167 NETLINK_CB(cb->skb).pid,
4168 cb->nlh->nlmsg_seq,
4169 RTM_NEWLINK, NLM_F_MULTI) <= 0)
4170 goto out;
4171 cont:
4172 idx++;
4173 }
4174 }
4175 out:
4176 rcu_read_unlock();
4177 cb->args[1] = idx;
4178 cb->args[0] = h;
4179
4180 return skb->len;
4181 }
4182
4183 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4184 {
4185 struct sk_buff *skb;
4186 struct net *net = dev_net(idev->dev);
4187 int err = -ENOBUFS;
4188
4189 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
4190 if (skb == NULL)
4191 goto errout;
4192
4193 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
4194 if (err < 0) {
4195 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4196 WARN_ON(err == -EMSGSIZE);
4197 kfree_skb(skb);
4198 goto errout;
4199 }
4200 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
4201 return;
4202 errout:
4203 if (err < 0)
4204 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
4205 }
4206
4207 static inline size_t inet6_prefix_nlmsg_size(void)
4208 {
4209 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4210 + nla_total_size(sizeof(struct in6_addr))
4211 + nla_total_size(sizeof(struct prefix_cacheinfo));
4212 }
4213
4214 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
4215 struct prefix_info *pinfo, u32 pid, u32 seq,
4216 int event, unsigned int flags)
4217 {
4218 struct prefixmsg *pmsg;
4219 struct nlmsghdr *nlh;
4220 struct prefix_cacheinfo ci;
4221
4222 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
4223 if (nlh == NULL)
4224 return -EMSGSIZE;
4225
4226 pmsg = nlmsg_data(nlh);
4227 pmsg->prefix_family = AF_INET6;
4228 pmsg->prefix_pad1 = 0;
4229 pmsg->prefix_pad2 = 0;
4230 pmsg->prefix_ifindex = idev->dev->ifindex;
4231 pmsg->prefix_len = pinfo->prefix_len;
4232 pmsg->prefix_type = pinfo->type;
4233 pmsg->prefix_pad3 = 0;
4234 pmsg->prefix_flags = 0;
4235 if (pinfo->onlink)
4236 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4237 if (pinfo->autoconf)
4238 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4239
4240 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
4241
4242 ci.preferred_time = ntohl(pinfo->prefered);
4243 ci.valid_time = ntohl(pinfo->valid);
4244 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
4245
4246 return nlmsg_end(skb, nlh);
4247
4248 nla_put_failure:
4249 nlmsg_cancel(skb, nlh);
4250 return -EMSGSIZE;
4251 }
4252
4253 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
4254 struct prefix_info *pinfo)
4255 {
4256 struct sk_buff *skb;
4257 struct net *net = dev_net(idev->dev);
4258 int err = -ENOBUFS;
4259
4260 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
4261 if (skb == NULL)
4262 goto errout;
4263
4264 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
4265 if (err < 0) {
4266 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4267 WARN_ON(err == -EMSGSIZE);
4268 kfree_skb(skb);
4269 goto errout;
4270 }
4271 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4272 return;
4273 errout:
4274 if (err < 0)
4275 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
4276 }
4277
4278 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4279 {
4280 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4281
4282 switch (event) {
4283 case RTM_NEWADDR:
4284 /*
4285 * If the address was optimistic
4286 * we inserted the route at the start of
4287 * our DAD process, so we don't need
4288 * to do it again
4289 */
4290 if (!(ifp->rt->rt6i_node))
4291 ip6_ins_rt(ifp->rt);
4292 if (ifp->idev->cnf.forwarding)
4293 addrconf_join_anycast(ifp);
4294 break;
4295 case RTM_DELADDR:
4296 if (ifp->idev->cnf.forwarding)
4297 addrconf_leave_anycast(ifp);
4298 addrconf_leave_solict(ifp->idev, &ifp->addr);
4299 dst_hold(&ifp->rt->dst);
4300
4301 if (ip6_del_rt(ifp->rt))
4302 dst_free(&ifp->rt->dst);
4303 break;
4304 }
4305 }
4306
4307 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4308 {
4309 rcu_read_lock_bh();
4310 if (likely(ifp->idev->dead == 0))
4311 __ipv6_ifa_notify(event, ifp);
4312 rcu_read_unlock_bh();
4313 }
4314
4315 #ifdef CONFIG_SYSCTL
4316
4317 static
4318 int addrconf_sysctl_forward(ctl_table *ctl, int write,
4319 void __user *buffer, size_t *lenp, loff_t *ppos)
4320 {
4321 int *valp = ctl->data;
4322 int val = *valp;
4323 loff_t pos = *ppos;
4324 ctl_table lctl;
4325 int ret;
4326
4327 /*
4328 * ctl->data points to idev->cnf.forwarding, we should
4329 * not modify it until we get the rtnl lock.
4330 */
4331 lctl = *ctl;
4332 lctl.data = &val;
4333
4334 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4335
4336 if (write)
4337 ret = addrconf_fixup_forwarding(ctl, valp, val);
4338 if (ret)
4339 *ppos = pos;
4340 return ret;
4341 }
4342
4343 static void dev_disable_change(struct inet6_dev *idev)
4344 {
4345 if (!idev || !idev->dev)
4346 return;
4347
4348 if (idev->cnf.disable_ipv6)
4349 addrconf_notify(NULL, NETDEV_DOWN, idev->dev);
4350 else
4351 addrconf_notify(NULL, NETDEV_UP, idev->dev);
4352 }
4353
4354 static void addrconf_disable_change(struct net *net, __s32 newf)
4355 {
4356 struct net_device *dev;
4357 struct inet6_dev *idev;
4358
4359 rcu_read_lock();
4360 for_each_netdev_rcu(net, dev) {
4361 idev = __in6_dev_get(dev);
4362 if (idev) {
4363 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4364 idev->cnf.disable_ipv6 = newf;
4365 if (changed)
4366 dev_disable_change(idev);
4367 }
4368 }
4369 rcu_read_unlock();
4370 }
4371
4372 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
4373 {
4374 struct net *net;
4375 int old;
4376
4377 if (!rtnl_trylock())
4378 return restart_syscall();
4379
4380 net = (struct net *)table->extra2;
4381 old = *p;
4382 *p = newf;
4383
4384 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
4385 rtnl_unlock();
4386 return 0;
4387 }
4388
4389 if (p == &net->ipv6.devconf_all->disable_ipv6) {
4390 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4391 addrconf_disable_change(net, newf);
4392 } else if ((!newf) ^ (!old))
4393 dev_disable_change((struct inet6_dev *)table->extra1);
4394
4395 rtnl_unlock();
4396 return 0;
4397 }
4398
4399 static
4400 int addrconf_sysctl_disable(ctl_table *ctl, int write,
4401 void __user *buffer, size_t *lenp, loff_t *ppos)
4402 {
4403 int *valp = ctl->data;
4404 int val = *valp;
4405 loff_t pos = *ppos;
4406 ctl_table lctl;
4407 int ret;
4408
4409 /*
4410 * ctl->data points to idev->cnf.disable_ipv6, we should
4411 * not modify it until we get the rtnl lock.
4412 */
4413 lctl = *ctl;
4414 lctl.data = &val;
4415
4416 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4417
4418 if (write)
4419 ret = addrconf_disable_ipv6(ctl, valp, val);
4420 if (ret)
4421 *ppos = pos;
4422 return ret;
4423 }
4424
4425 static struct addrconf_sysctl_table
4426 {
4427 struct ctl_table_header *sysctl_header;
4428 ctl_table addrconf_vars[DEVCONF_MAX+1];
4429 char *dev_name;
4430 } addrconf_sysctl __read_mostly = {
4431 .sysctl_header = NULL,
4432 .addrconf_vars = {
4433 {
4434 .procname = "forwarding",
4435 .data = &ipv6_devconf.forwarding,
4436 .maxlen = sizeof(int),
4437 .mode = 0644,
4438 .proc_handler = addrconf_sysctl_forward,
4439 },
4440 {
4441 .procname = "hop_limit",
4442 .data = &ipv6_devconf.hop_limit,
4443 .maxlen = sizeof(int),
4444 .mode = 0644,
4445 .proc_handler = proc_dointvec,
4446 },
4447 {
4448 .procname = "mtu",
4449 .data = &ipv6_devconf.mtu6,
4450 .maxlen = sizeof(int),
4451 .mode = 0644,
4452 .proc_handler = proc_dointvec,
4453 },
4454 {
4455 .procname = "accept_ra",
4456 .data = &ipv6_devconf.accept_ra,
4457 .maxlen = sizeof(int),
4458 .mode = 0644,
4459 .proc_handler = proc_dointvec,
4460 },
4461 {
4462 .procname = "accept_redirects",
4463 .data = &ipv6_devconf.accept_redirects,
4464 .maxlen = sizeof(int),
4465 .mode = 0644,
4466 .proc_handler = proc_dointvec,
4467 },
4468 {
4469 .procname = "autoconf",
4470 .data = &ipv6_devconf.autoconf,
4471 .maxlen = sizeof(int),
4472 .mode = 0644,
4473 .proc_handler = proc_dointvec,
4474 },
4475 {
4476 .procname = "dad_transmits",
4477 .data = &ipv6_devconf.dad_transmits,
4478 .maxlen = sizeof(int),
4479 .mode = 0644,
4480 .proc_handler = proc_dointvec,
4481 },
4482 {
4483 .procname = "router_solicitations",
4484 .data = &ipv6_devconf.rtr_solicits,
4485 .maxlen = sizeof(int),
4486 .mode = 0644,
4487 .proc_handler = proc_dointvec,
4488 },
4489 {
4490 .procname = "router_solicitation_interval",
4491 .data = &ipv6_devconf.rtr_solicit_interval,
4492 .maxlen = sizeof(int),
4493 .mode = 0644,
4494 .proc_handler = proc_dointvec_jiffies,
4495 },
4496 {
4497 .procname = "router_solicitation_delay",
4498 .data = &ipv6_devconf.rtr_solicit_delay,
4499 .maxlen = sizeof(int),
4500 .mode = 0644,
4501 .proc_handler = proc_dointvec_jiffies,
4502 },
4503 {
4504 .procname = "force_mld_version",
4505 .data = &ipv6_devconf.force_mld_version,
4506 .maxlen = sizeof(int),
4507 .mode = 0644,
4508 .proc_handler = proc_dointvec,
4509 },
4510 #ifdef CONFIG_IPV6_PRIVACY
4511 {
4512 .procname = "use_tempaddr",
4513 .data = &ipv6_devconf.use_tempaddr,
4514 .maxlen = sizeof(int),
4515 .mode = 0644,
4516 .proc_handler = proc_dointvec,
4517 },
4518 {
4519 .procname = "temp_valid_lft",
4520 .data = &ipv6_devconf.temp_valid_lft,
4521 .maxlen = sizeof(int),
4522 .mode = 0644,
4523 .proc_handler = proc_dointvec,
4524 },
4525 {
4526 .procname = "temp_prefered_lft",
4527 .data = &ipv6_devconf.temp_prefered_lft,
4528 .maxlen = sizeof(int),
4529 .mode = 0644,
4530 .proc_handler = proc_dointvec,
4531 },
4532 {
4533 .procname = "regen_max_retry",
4534 .data = &ipv6_devconf.regen_max_retry,
4535 .maxlen = sizeof(int),
4536 .mode = 0644,
4537 .proc_handler = proc_dointvec,
4538 },
4539 {
4540 .procname = "max_desync_factor",
4541 .data = &ipv6_devconf.max_desync_factor,
4542 .maxlen = sizeof(int),
4543 .mode = 0644,
4544 .proc_handler = proc_dointvec,
4545 },
4546 #endif
4547 {
4548 .procname = "max_addresses",
4549 .data = &ipv6_devconf.max_addresses,
4550 .maxlen = sizeof(int),
4551 .mode = 0644,
4552 .proc_handler = proc_dointvec,
4553 },
4554 {
4555 .procname = "accept_ra_defrtr",
4556 .data = &ipv6_devconf.accept_ra_defrtr,
4557 .maxlen = sizeof(int),
4558 .mode = 0644,
4559 .proc_handler = proc_dointvec,
4560 },
4561 {
4562 .procname = "accept_ra_pinfo",
4563 .data = &ipv6_devconf.accept_ra_pinfo,
4564 .maxlen = sizeof(int),
4565 .mode = 0644,
4566 .proc_handler = proc_dointvec,
4567 },
4568 #ifdef CONFIG_IPV6_ROUTER_PREF
4569 {
4570 .procname = "accept_ra_rtr_pref",
4571 .data = &ipv6_devconf.accept_ra_rtr_pref,
4572 .maxlen = sizeof(int),
4573 .mode = 0644,
4574 .proc_handler = proc_dointvec,
4575 },
4576 {
4577 .procname = "router_probe_interval",
4578 .data = &ipv6_devconf.rtr_probe_interval,
4579 .maxlen = sizeof(int),
4580 .mode = 0644,
4581 .proc_handler = proc_dointvec_jiffies,
4582 },
4583 #ifdef CONFIG_IPV6_ROUTE_INFO
4584 {
4585 .procname = "accept_ra_rt_info_max_plen",
4586 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4587 .maxlen = sizeof(int),
4588 .mode = 0644,
4589 .proc_handler = proc_dointvec,
4590 },
4591 #endif
4592 #endif
4593 {
4594 .procname = "proxy_ndp",
4595 .data = &ipv6_devconf.proxy_ndp,
4596 .maxlen = sizeof(int),
4597 .mode = 0644,
4598 .proc_handler = proc_dointvec,
4599 },
4600 {
4601 .procname = "accept_source_route",
4602 .data = &ipv6_devconf.accept_source_route,
4603 .maxlen = sizeof(int),
4604 .mode = 0644,
4605 .proc_handler = proc_dointvec,
4606 },
4607 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4608 {
4609 .procname = "optimistic_dad",
4610 .data = &ipv6_devconf.optimistic_dad,
4611 .maxlen = sizeof(int),
4612 .mode = 0644,
4613 .proc_handler = proc_dointvec,
4614
4615 },
4616 #endif
4617 #ifdef CONFIG_IPV6_MROUTE
4618 {
4619 .procname = "mc_forwarding",
4620 .data = &ipv6_devconf.mc_forwarding,
4621 .maxlen = sizeof(int),
4622 .mode = 0444,
4623 .proc_handler = proc_dointvec,
4624 },
4625 #endif
4626 {
4627 .procname = "disable_ipv6",
4628 .data = &ipv6_devconf.disable_ipv6,
4629 .maxlen = sizeof(int),
4630 .mode = 0644,
4631 .proc_handler = addrconf_sysctl_disable,
4632 },
4633 {
4634 .procname = "accept_dad",
4635 .data = &ipv6_devconf.accept_dad,
4636 .maxlen = sizeof(int),
4637 .mode = 0644,
4638 .proc_handler = proc_dointvec,
4639 },
4640 {
4641 .procname = "force_tllao",
4642 .data = &ipv6_devconf.force_tllao,
4643 .maxlen = sizeof(int),
4644 .mode = 0644,
4645 .proc_handler = proc_dointvec
4646 },
4647 {
4648 /* sentinel */
4649 }
4650 },
4651 };
4652
4653 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4654 struct inet6_dev *idev, struct ipv6_devconf *p)
4655 {
4656 int i;
4657 struct addrconf_sysctl_table *t;
4658
4659 #define ADDRCONF_CTL_PATH_DEV 3
4660
4661 struct ctl_path addrconf_ctl_path[] = {
4662 { .procname = "net", },
4663 { .procname = "ipv6", },
4664 { .procname = "conf", },
4665 { /* to be set */ },
4666 { },
4667 };
4668
4669
4670 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4671 if (t == NULL)
4672 goto out;
4673
4674 for (i = 0; t->addrconf_vars[i].data; i++) {
4675 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
4676 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4677 t->addrconf_vars[i].extra2 = net;
4678 }
4679
4680 /*
4681 * Make a copy of dev_name, because '.procname' is regarded as const
4682 * by sysctl and we wouldn't want anyone to change it under our feet
4683 * (see SIOCSIFNAME).
4684 */
4685 t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4686 if (!t->dev_name)
4687 goto free;
4688
4689 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
4690
4691 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
4692 t->addrconf_vars);
4693 if (t->sysctl_header == NULL)
4694 goto free_procname;
4695
4696 p->sysctl = t;
4697 return 0;
4698
4699 free_procname:
4700 kfree(t->dev_name);
4701 free:
4702 kfree(t);
4703 out:
4704 return -ENOBUFS;
4705 }
4706
4707 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4708 {
4709 struct addrconf_sysctl_table *t;
4710
4711 if (p->sysctl == NULL)
4712 return;
4713
4714 t = p->sysctl;
4715 p->sysctl = NULL;
4716 unregister_net_sysctl_table(t->sysctl_header);
4717 kfree(t->dev_name);
4718 kfree(t);
4719 }
4720
4721 static void addrconf_sysctl_register(struct inet6_dev *idev)
4722 {
4723 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
4724 &ndisc_ifinfo_sysctl_change);
4725 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
4726 idev, &idev->cnf);
4727 }
4728
4729 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
4730 {
4731 __addrconf_sysctl_unregister(&idev->cnf);
4732 neigh_sysctl_unregister(idev->nd_parms);
4733 }
4734
4735
4736 #endif
4737
4738 static int __net_init addrconf_init_net(struct net *net)
4739 {
4740 int err = -ENOMEM;
4741 struct ipv6_devconf *all, *dflt;
4742
4743 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
4744 if (all == NULL)
4745 goto err_alloc_all;
4746
4747 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4748 if (dflt == NULL)
4749 goto err_alloc_dflt;
4750
4751 /* these will be inherited by all namespaces */
4752 dflt->autoconf = ipv6_defaults.autoconf;
4753 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
4754
4755 net->ipv6.devconf_all = all;
4756 net->ipv6.devconf_dflt = dflt;
4757
4758 #ifdef CONFIG_SYSCTL
4759 err = __addrconf_sysctl_register(net, "all", NULL, all);
4760 if (err < 0)
4761 goto err_reg_all;
4762
4763 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
4764 if (err < 0)
4765 goto err_reg_dflt;
4766 #endif
4767 return 0;
4768
4769 #ifdef CONFIG_SYSCTL
4770 err_reg_dflt:
4771 __addrconf_sysctl_unregister(all);
4772 err_reg_all:
4773 kfree(dflt);
4774 #endif
4775 err_alloc_dflt:
4776 kfree(all);
4777 err_alloc_all:
4778 return err;
4779 }
4780
4781 static void __net_exit addrconf_exit_net(struct net *net)
4782 {
4783 #ifdef CONFIG_SYSCTL
4784 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4785 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4786 #endif
4787 if (!net_eq(net, &init_net)) {
4788 kfree(net->ipv6.devconf_dflt);
4789 kfree(net->ipv6.devconf_all);
4790 }
4791 }
4792
4793 static struct pernet_operations addrconf_ops = {
4794 .init = addrconf_init_net,
4795 .exit = addrconf_exit_net,
4796 };
4797
4798 /*
4799 * Device notifier
4800 */
4801
4802 int register_inet6addr_notifier(struct notifier_block *nb)
4803 {
4804 return atomic_notifier_chain_register(&inet6addr_chain, nb);
4805 }
4806 EXPORT_SYMBOL(register_inet6addr_notifier);
4807
4808 int unregister_inet6addr_notifier(struct notifier_block *nb)
4809 {
4810 return atomic_notifier_chain_unregister(&inet6addr_chain, nb);
4811 }
4812 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4813
4814 static struct rtnl_af_ops inet6_ops = {
4815 .family = AF_INET6,
4816 .fill_link_af = inet6_fill_link_af,
4817 .get_link_af_size = inet6_get_link_af_size,
4818 };
4819
4820 /*
4821 * Init / cleanup code
4822 */
4823
4824 int __init addrconf_init(void)
4825 {
4826 int i, err;
4827
4828 err = ipv6_addr_label_init();
4829 if (err < 0) {
4830 printk(KERN_CRIT "IPv6 Addrconf:"
4831 " cannot initialize default policy table: %d.\n", err);
4832 goto out;
4833 }
4834
4835 err = register_pernet_subsys(&addrconf_ops);
4836 if (err < 0)
4837 goto out_addrlabel;
4838
4839 /* The addrconf netdev notifier requires that loopback_dev
4840 * has it's ipv6 private information allocated and setup
4841 * before it can bring up and give link-local addresses
4842 * to other devices which are up.
4843 *
4844 * Unfortunately, loopback_dev is not necessarily the first
4845 * entry in the global dev_base list of net devices. In fact,
4846 * it is likely to be the very last entry on that list.
4847 * So this causes the notifier registry below to try and
4848 * give link-local addresses to all devices besides loopback_dev
4849 * first, then loopback_dev, which cases all the non-loopback_dev
4850 * devices to fail to get a link-local address.
4851 *
4852 * So, as a temporary fix, allocate the ipv6 structure for
4853 * loopback_dev first by hand.
4854 * Longer term, all of the dependencies ipv6 has upon the loopback
4855 * device and it being up should be removed.
4856 */
4857 rtnl_lock();
4858 if (!ipv6_add_dev(init_net.loopback_dev))
4859 err = -ENOMEM;
4860 rtnl_unlock();
4861 if (err)
4862 goto errlo;
4863
4864 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4865 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
4866
4867 register_netdevice_notifier(&ipv6_dev_notf);
4868
4869 addrconf_verify(0);
4870
4871 err = rtnl_af_register(&inet6_ops);
4872 if (err < 0)
4873 goto errout_af;
4874
4875 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
4876 NULL);
4877 if (err < 0)
4878 goto errout;
4879
4880 /* Only the first call to __rtnl_register can fail */
4881 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
4882 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
4883 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
4884 inet6_dump_ifaddr, NULL);
4885 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
4886 inet6_dump_ifmcaddr, NULL);
4887 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
4888 inet6_dump_ifacaddr, NULL);
4889
4890 ipv6_addr_label_rtnl_register();
4891
4892 return 0;
4893 errout:
4894 rtnl_af_unregister(&inet6_ops);
4895 errout_af:
4896 unregister_netdevice_notifier(&ipv6_dev_notf);
4897 errlo:
4898 unregister_pernet_subsys(&addrconf_ops);
4899 out_addrlabel:
4900 ipv6_addr_label_cleanup();
4901 out:
4902 return err;
4903 }
4904
4905 void addrconf_cleanup(void)
4906 {
4907 struct net_device *dev;
4908 int i;
4909
4910 unregister_netdevice_notifier(&ipv6_dev_notf);
4911 unregister_pernet_subsys(&addrconf_ops);
4912 ipv6_addr_label_cleanup();
4913
4914 rtnl_lock();
4915
4916 __rtnl_af_unregister(&inet6_ops);
4917
4918 /* clean dev list */
4919 for_each_netdev(&init_net, dev) {
4920 if (__in6_dev_get(dev) == NULL)
4921 continue;
4922 addrconf_ifdown(dev, 1);
4923 }
4924 addrconf_ifdown(init_net.loopback_dev, 2);
4925
4926 /*
4927 * Check hash table.
4928 */
4929 spin_lock_bh(&addrconf_hash_lock);
4930 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4931 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
4932 spin_unlock_bh(&addrconf_hash_lock);
4933
4934 del_timer(&addr_chk_timer);
4935 rtnl_unlock();
4936 }
Linux with added FPC-III support