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Add linux-next specific files for 20110831
[linux-2.6/next.git] / net / ipv6 / addrconf.c
blob8f1e5be26d912ed7f93d43cd763b2fe6de8c9a40
1 /*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 */
14
15 /*
16 * Changes:
17 *
18 * Janos Farkas : delete timer on ifdown
19 * <chexum@bankinf.banki.hu>
20 * Andi Kleen : kill double kfree on module
21 * unload.
22 * Maciej W. Rozycki : FDDI support
23 * sekiya@USAGI : Don't send too many RS
24 * packets.
25 * yoshfuji@USAGI : Fixed interval between DAD
26 * packets.
27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
28 * address validation timer.
29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
30 * support.
31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
32 * address on a same interface.
33 * YOSHIFUJI Hideaki @USAGI : ARCnet support
34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
35 * seq_file.
36 * YOSHIFUJI Hideaki @USAGI : improved source address
37 * selection; consider scope,
38 * status etc.
39 */
40
41 #include <linux/errno.h>
42 #include <linux/types.h>
43 #include <linux/kernel.h>
44 #include <linux/socket.h>
45 #include <linux/sockios.h>
46 #include <linux/net.h>
47 #include <linux/in6.h>
48 #include <linux/netdevice.h>
49 #include <linux/if_addr.h>
50 #include <linux/if_arp.h>
51 #include <linux/if_arcnet.h>
52 #include <linux/if_infiniband.h>
53 #include <linux/route.h>
54 #include <linux/inetdevice.h>
55 #include <linux/init.h>
56 #include <linux/slab.h>
57 #ifdef CONFIG_SYSCTL
58 #include <linux/sysctl.h>
59 #endif
60 #include <linux/capability.h>
61 #include <linux/delay.h>
62 #include <linux/notifier.h>
63 #include <linux/string.h>
64
65 #include <net/net_namespace.h>
66 #include <net/sock.h>
67 #include <net/snmp.h>
68
69 #include <net/ipv6.h>
70 #include <net/protocol.h>
71 #include <net/ndisc.h>
72 #include <net/ip6_route.h>
73 #include <net/addrconf.h>
74 #include <net/tcp.h>
75 #include <net/ip.h>
76 #include <net/netlink.h>
77 #include <net/pkt_sched.h>
78 #include <linux/if_tunnel.h>
79 #include <linux/rtnetlink.h>
80
81 #ifdef CONFIG_IPV6_PRIVACY
82 #include <linux/random.h>
83 #endif
84
85 #include <linux/uaccess.h>
86 #include <asm/unaligned.h>
87
88 #include <linux/proc_fs.h>
89 #include <linux/seq_file.h>
90
91 /* Set to 3 to get tracing... */
92 #define ACONF_DEBUG 2
93
94 #if ACONF_DEBUG >= 3
95 #define ADBG(x) printk x
96 #else
97 #define ADBG(x)
98 #endif
99
100 #define INFINITY_LIFE_TIME 0xFFFFFFFF
101
102 static inline u32 cstamp_delta(unsigned long cstamp)
103 {
104 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
105 }
106
107 #define ADDRCONF_TIMER_FUZZ_MINUS (HZ > 50 ? HZ/50 : 1)
108 #define ADDRCONF_TIMER_FUZZ (HZ / 4)
109 #define ADDRCONF_TIMER_FUZZ_MAX (HZ)
110
111 #ifdef CONFIG_SYSCTL
112 static void addrconf_sysctl_register(struct inet6_dev *idev);
113 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
114 #else
115 static inline void addrconf_sysctl_register(struct inet6_dev *idev)
116 {
117 }
118
119 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
120 {
121 }
122 #endif
123
124 #ifdef CONFIG_IPV6_PRIVACY
125 static int __ipv6_regen_rndid(struct inet6_dev *idev);
126 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
127 static void ipv6_regen_rndid(unsigned long data);
128 #endif
129
130 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
131 static int ipv6_count_addresses(struct inet6_dev *idev);
132
133 /*
134 * Configured unicast address hash table
135 */
136 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
137 static DEFINE_SPINLOCK(addrconf_hash_lock);
138
139 static void addrconf_verify(unsigned long);
140
141 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
142 static DEFINE_SPINLOCK(addrconf_verify_lock);
143
144 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
145 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
146
147 static void addrconf_type_change(struct net_device *dev,
148 unsigned long event);
149 static int addrconf_ifdown(struct net_device *dev, int how);
150
151 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
152 static void addrconf_dad_timer(unsigned long data);
153 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
154 static void addrconf_dad_run(struct inet6_dev *idev);
155 static void addrconf_rs_timer(unsigned long data);
156 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
157 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
158
159 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
160 struct prefix_info *pinfo);
161 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
162 struct net_device *dev);
163
164 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
165
166 static struct ipv6_devconf ipv6_devconf __read_mostly = {
167 .forwarding = 0,
168 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
169 .mtu6 = IPV6_MIN_MTU,
170 .accept_ra = 1,
171 .accept_redirects = 1,
172 .autoconf = 1,
173 .force_mld_version = 0,
174 .dad_transmits = 1,
175 .rtr_solicits = MAX_RTR_SOLICITATIONS,
176 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
177 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
178 #ifdef CONFIG_IPV6_PRIVACY
179 .use_tempaddr = 0,
180 .temp_valid_lft = TEMP_VALID_LIFETIME,
181 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
182 .regen_max_retry = REGEN_MAX_RETRY,
183 .max_desync_factor = MAX_DESYNC_FACTOR,
184 #endif
185 .max_addresses = IPV6_MAX_ADDRESSES,
186 .accept_ra_defrtr = 1,
187 .accept_ra_pinfo = 1,
188 #ifdef CONFIG_IPV6_ROUTER_PREF
189 .accept_ra_rtr_pref = 1,
190 .rtr_probe_interval = 60 * HZ,
191 #ifdef CONFIG_IPV6_ROUTE_INFO
192 .accept_ra_rt_info_max_plen = 0,
193 #endif
194 #endif
195 .proxy_ndp = 0,
196 .accept_source_route = 0, /* we do not accept RH0 by default. */
197 .disable_ipv6 = 0,
198 .accept_dad = 1,
199 };
200
201 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
202 .forwarding = 0,
203 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
204 .mtu6 = IPV6_MIN_MTU,
205 .accept_ra = 1,
206 .accept_redirects = 1,
207 .autoconf = 1,
208 .dad_transmits = 1,
209 .rtr_solicits = MAX_RTR_SOLICITATIONS,
210 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
211 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
212 #ifdef CONFIG_IPV6_PRIVACY
213 .use_tempaddr = 0,
214 .temp_valid_lft = TEMP_VALID_LIFETIME,
215 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
216 .regen_max_retry = REGEN_MAX_RETRY,
217 .max_desync_factor = MAX_DESYNC_FACTOR,
218 #endif
219 .max_addresses = IPV6_MAX_ADDRESSES,
220 .accept_ra_defrtr = 1,
221 .accept_ra_pinfo = 1,
222 #ifdef CONFIG_IPV6_ROUTER_PREF
223 .accept_ra_rtr_pref = 1,
224 .rtr_probe_interval = 60 * HZ,
225 #ifdef CONFIG_IPV6_ROUTE_INFO
226 .accept_ra_rt_info_max_plen = 0,
227 #endif
228 #endif
229 .proxy_ndp = 0,
230 .accept_source_route = 0, /* we do not accept RH0 by default. */
231 .disable_ipv6 = 0,
232 .accept_dad = 1,
233 };
234
235 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
236 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
237 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
238 const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
239 const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
240
241 /* Check if a valid qdisc is available */
242 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
243 {
244 return !qdisc_tx_is_noop(dev);
245 }
246
247 /* Check if a route is valid prefix route */
248 static inline int addrconf_is_prefix_route(const struct rt6_info *rt)
249 {
250 return (rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0;
251 }
252
253 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
254 {
255 if (del_timer(&ifp->timer))
256 __in6_ifa_put(ifp);
257 }
258
259 enum addrconf_timer_t {
260 AC_NONE,
261 AC_DAD,
262 AC_RS,
263 };
264
265 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
266 enum addrconf_timer_t what,
267 unsigned long when)
268 {
269 if (!del_timer(&ifp->timer))
270 in6_ifa_hold(ifp);
271
272 switch (what) {
273 case AC_DAD:
274 ifp->timer.function = addrconf_dad_timer;
275 break;
276 case AC_RS:
277 ifp->timer.function = addrconf_rs_timer;
278 break;
279 default:
280 break;
281 }
282 ifp->timer.expires = jiffies + when;
283 add_timer(&ifp->timer);
284 }
285
286 static int snmp6_alloc_dev(struct inet6_dev *idev)
287 {
288 if (snmp_mib_init((void __percpu **)idev->stats.ipv6,
289 sizeof(struct ipstats_mib),
290 __alignof__(struct ipstats_mib)) < 0)
291 goto err_ip;
292 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
293 GFP_KERNEL);
294 if (!idev->stats.icmpv6dev)
295 goto err_icmp;
296 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
297 GFP_KERNEL);
298 if (!idev->stats.icmpv6msgdev)
299 goto err_icmpmsg;
300
301 return 0;
302
303 err_icmpmsg:
304 kfree(idev->stats.icmpv6dev);
305 err_icmp:
306 snmp_mib_free((void __percpu **)idev->stats.ipv6);
307 err_ip:
308 return -ENOMEM;
309 }
310
311 static void snmp6_free_dev(struct inet6_dev *idev)
312 {
313 kfree(idev->stats.icmpv6msgdev);
314 kfree(idev->stats.icmpv6dev);
315 snmp_mib_free((void __percpu **)idev->stats.ipv6);
316 }
317
318 /* Nobody refers to this device, we may destroy it. */
319
320 void in6_dev_finish_destroy(struct inet6_dev *idev)
321 {
322 struct net_device *dev = idev->dev;
323
324 WARN_ON(!list_empty(&idev->addr_list));
325 WARN_ON(idev->mc_list != NULL);
326
327 #ifdef NET_REFCNT_DEBUG
328 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
329 #endif
330 dev_put(dev);
331 if (!idev->dead) {
332 pr_warning("Freeing alive inet6 device %p\n", idev);
333 return;
334 }
335 snmp6_free_dev(idev);
336 kfree_rcu(idev, rcu);
337 }
338
339 EXPORT_SYMBOL(in6_dev_finish_destroy);
340
341 static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
342 {
343 struct inet6_dev *ndev;
344
345 ASSERT_RTNL();
346
347 if (dev->mtu < IPV6_MIN_MTU)
348 return NULL;
349
350 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
351
352 if (ndev == NULL)
353 return NULL;
354
355 rwlock_init(&ndev->lock);
356 ndev->dev = dev;
357 INIT_LIST_HEAD(&ndev->addr_list);
358
359 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
360 ndev->cnf.mtu6 = dev->mtu;
361 ndev->cnf.sysctl = NULL;
362 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
363 if (ndev->nd_parms == NULL) {
364 kfree(ndev);
365 return NULL;
366 }
367 if (ndev->cnf.forwarding)
368 dev_disable_lro(dev);
369 /* We refer to the device */
370 dev_hold(dev);
371
372 if (snmp6_alloc_dev(ndev) < 0) {
373 ADBG((KERN_WARNING
374 "%s(): cannot allocate memory for statistics; dev=%s.\n",
375 __func__, dev->name));
376 neigh_parms_release(&nd_tbl, ndev->nd_parms);
377 ndev->dead = 1;
378 in6_dev_finish_destroy(ndev);
379 return NULL;
380 }
381
382 if (snmp6_register_dev(ndev) < 0) {
383 ADBG((KERN_WARNING
384 "%s(): cannot create /proc/net/dev_snmp6/%s\n",
385 __func__, dev->name));
386 neigh_parms_release(&nd_tbl, ndev->nd_parms);
387 ndev->dead = 1;
388 in6_dev_finish_destroy(ndev);
389 return NULL;
390 }
391
392 /* One reference from device. We must do this before
393 * we invoke __ipv6_regen_rndid().
394 */
395 in6_dev_hold(ndev);
396
397 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
398 ndev->cnf.accept_dad = -1;
399
400 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
401 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
402 printk(KERN_INFO
403 "%s: Disabled Multicast RS\n",
404 dev->name);
405 ndev->cnf.rtr_solicits = 0;
406 }
407 #endif
408
409 #ifdef CONFIG_IPV6_PRIVACY
410 INIT_LIST_HEAD(&ndev->tempaddr_list);
411 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
412 if ((dev->flags&IFF_LOOPBACK) ||
413 dev->type == ARPHRD_TUNNEL ||
414 dev->type == ARPHRD_TUNNEL6 ||
415 dev->type == ARPHRD_SIT ||
416 dev->type == ARPHRD_NONE) {
417 ndev->cnf.use_tempaddr = -1;
418 } else {
419 in6_dev_hold(ndev);
420 ipv6_regen_rndid((unsigned long) ndev);
421 }
422 #endif
423
424 if (netif_running(dev) && addrconf_qdisc_ok(dev))
425 ndev->if_flags |= IF_READY;
426
427 ipv6_mc_init_dev(ndev);
428 ndev->tstamp = jiffies;
429 addrconf_sysctl_register(ndev);
430 /* protected by rtnl_lock */
431 RCU_INIT_POINTER(dev->ip6_ptr, ndev);
432
433 /* Join all-node multicast group */
434 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
435
436 return ndev;
437 }
438
439 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
440 {
441 struct inet6_dev *idev;
442
443 ASSERT_RTNL();
444
445 idev = __in6_dev_get(dev);
446 if (!idev) {
447 idev = ipv6_add_dev(dev);
448 if (!idev)
449 return NULL;
450 }
451
452 if (dev->flags&IFF_UP)
453 ipv6_mc_up(idev);
454 return idev;
455 }
456
457 #ifdef CONFIG_SYSCTL
458 static void dev_forward_change(struct inet6_dev *idev)
459 {
460 struct net_device *dev;
461 struct inet6_ifaddr *ifa;
462
463 if (!idev)
464 return;
465 dev = idev->dev;
466 if (idev->cnf.forwarding)
467 dev_disable_lro(dev);
468 if (dev && (dev->flags & IFF_MULTICAST)) {
469 if (idev->cnf.forwarding)
470 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
471 else
472 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
473 }
474
475 list_for_each_entry(ifa, &idev->addr_list, if_list) {
476 if (ifa->flags&IFA_F_TENTATIVE)
477 continue;
478 if (idev->cnf.forwarding)
479 addrconf_join_anycast(ifa);
480 else
481 addrconf_leave_anycast(ifa);
482 }
483 }
484
485
486 static void addrconf_forward_change(struct net *net, __s32 newf)
487 {
488 struct net_device *dev;
489 struct inet6_dev *idev;
490
491 rcu_read_lock();
492 for_each_netdev_rcu(net, dev) {
493 idev = __in6_dev_get(dev);
494 if (idev) {
495 int changed = (!idev->cnf.forwarding) ^ (!newf);
496 idev->cnf.forwarding = newf;
497 if (changed)
498 dev_forward_change(idev);
499 }
500 }
501 rcu_read_unlock();
502 }
503
504 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old)
505 {
506 struct net *net;
507
508 net = (struct net *)table->extra2;
509 if (p == &net->ipv6.devconf_dflt->forwarding)
510 return 0;
511
512 if (!rtnl_trylock()) {
513 /* Restore the original values before restarting */
514 *p = old;
515 return restart_syscall();
516 }
517
518 if (p == &net->ipv6.devconf_all->forwarding) {
519 __s32 newf = net->ipv6.devconf_all->forwarding;
520 net->ipv6.devconf_dflt->forwarding = newf;
521 addrconf_forward_change(net, newf);
522 } else if ((!*p) ^ (!old))
523 dev_forward_change((struct inet6_dev *)table->extra1);
524 rtnl_unlock();
525
526 if (*p)
527 rt6_purge_dflt_routers(net);
528 return 1;
529 }
530 #endif
531
532 /* Nobody refers to this ifaddr, destroy it */
533 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
534 {
535 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
536
537 #ifdef NET_REFCNT_DEBUG
538 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
539 #endif
540
541 in6_dev_put(ifp->idev);
542
543 if (del_timer(&ifp->timer))
544 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp);
545
546 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
547 pr_warning("Freeing alive inet6 address %p\n", ifp);
548 return;
549 }
550 dst_release(&ifp->rt->dst);
551
552 kfree_rcu(ifp, rcu);
553 }
554
555 static void
556 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
557 {
558 struct list_head *p;
559 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
560
561 /*
562 * Each device address list is sorted in order of scope -
563 * global before linklocal.
564 */
565 list_for_each(p, &idev->addr_list) {
566 struct inet6_ifaddr *ifa
567 = list_entry(p, struct inet6_ifaddr, if_list);
568 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
569 break;
570 }
571
572 list_add_tail(&ifp->if_list, p);
573 }
574
575 static u32 ipv6_addr_hash(const struct in6_addr *addr)
576 {
577 /*
578 * We perform the hash function over the last 64 bits of the address
579 * This will include the IEEE address token on links that support it.
580 */
581 return jhash_2words((__force u32)addr->s6_addr32[2],
582 (__force u32)addr->s6_addr32[3], 0)
583 & (IN6_ADDR_HSIZE - 1);
584 }
585
586 /* On success it returns ifp with increased reference count */
587
588 static struct inet6_ifaddr *
589 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
590 int scope, u32 flags)
591 {
592 struct inet6_ifaddr *ifa = NULL;
593 struct rt6_info *rt;
594 unsigned int hash;
595 int err = 0;
596 int addr_type = ipv6_addr_type(addr);
597
598 if (addr_type == IPV6_ADDR_ANY ||
599 addr_type & IPV6_ADDR_MULTICAST ||
600 (!(idev->dev->flags & IFF_LOOPBACK) &&
601 addr_type & IPV6_ADDR_LOOPBACK))
602 return ERR_PTR(-EADDRNOTAVAIL);
603
604 rcu_read_lock_bh();
605 if (idev->dead) {
606 err = -ENODEV; /*XXX*/
607 goto out2;
608 }
609
610 if (idev->cnf.disable_ipv6) {
611 err = -EACCES;
612 goto out2;
613 }
614
615 spin_lock(&addrconf_hash_lock);
616
617 /* Ignore adding duplicate addresses on an interface */
618 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
619 ADBG(("ipv6_add_addr: already assigned\n"));
620 err = -EEXIST;
621 goto out;
622 }
623
624 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
625
626 if (ifa == NULL) {
627 ADBG(("ipv6_add_addr: malloc failed\n"));
628 err = -ENOBUFS;
629 goto out;
630 }
631
632 rt = addrconf_dst_alloc(idev, addr, 0);
633 if (IS_ERR(rt)) {
634 err = PTR_ERR(rt);
635 goto out;
636 }
637
638 ipv6_addr_copy(&ifa->addr, addr);
639
640 spin_lock_init(&ifa->lock);
641 spin_lock_init(&ifa->state_lock);
642 init_timer(&ifa->timer);
643 INIT_HLIST_NODE(&ifa->addr_lst);
644 ifa->timer.data = (unsigned long) ifa;
645 ifa->scope = scope;
646 ifa->prefix_len = pfxlen;
647 ifa->flags = flags | IFA_F_TENTATIVE;
648 ifa->cstamp = ifa->tstamp = jiffies;
649
650 ifa->rt = rt;
651
652 /*
653 * part one of RFC 4429, section 3.3
654 * We should not configure an address as
655 * optimistic if we do not yet know the link
656 * layer address of our nexhop router
657 */
658
659 if (dst_get_neighbour_raw(&rt->dst) == NULL)
660 ifa->flags &= ~IFA_F_OPTIMISTIC;
661
662 ifa->idev = idev;
663 in6_dev_hold(idev);
664 /* For caller */
665 in6_ifa_hold(ifa);
666
667 /* Add to big hash table */
668 hash = ipv6_addr_hash(addr);
669
670 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
671 spin_unlock(&addrconf_hash_lock);
672
673 write_lock(&idev->lock);
674 /* Add to inet6_dev unicast addr list. */
675 ipv6_link_dev_addr(idev, ifa);
676
677 #ifdef CONFIG_IPV6_PRIVACY
678 if (ifa->flags&IFA_F_TEMPORARY) {
679 list_add(&ifa->tmp_list, &idev->tempaddr_list);
680 in6_ifa_hold(ifa);
681 }
682 #endif
683
684 in6_ifa_hold(ifa);
685 write_unlock(&idev->lock);
686 out2:
687 rcu_read_unlock_bh();
688
689 if (likely(err == 0))
690 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
691 else {
692 kfree(ifa);
693 ifa = ERR_PTR(err);
694 }
695
696 return ifa;
697 out:
698 spin_unlock(&addrconf_hash_lock);
699 goto out2;
700 }
701
702 /* This function wants to get referenced ifp and releases it before return */
703
704 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
705 {
706 struct inet6_ifaddr *ifa, *ifn;
707 struct inet6_dev *idev = ifp->idev;
708 int state;
709 int deleted = 0, onlink = 0;
710 unsigned long expires = jiffies;
711
712 spin_lock_bh(&ifp->state_lock);
713 state = ifp->state;
714 ifp->state = INET6_IFADDR_STATE_DEAD;
715 spin_unlock_bh(&ifp->state_lock);
716
717 if (state == INET6_IFADDR_STATE_DEAD)
718 goto out;
719
720 spin_lock_bh(&addrconf_hash_lock);
721 hlist_del_init_rcu(&ifp->addr_lst);
722 spin_unlock_bh(&addrconf_hash_lock);
723
724 write_lock_bh(&idev->lock);
725 #ifdef CONFIG_IPV6_PRIVACY
726 if (ifp->flags&IFA_F_TEMPORARY) {
727 list_del(&ifp->tmp_list);
728 if (ifp->ifpub) {
729 in6_ifa_put(ifp->ifpub);
730 ifp->ifpub = NULL;
731 }
732 __in6_ifa_put(ifp);
733 }
734 #endif
735
736 list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) {
737 if (ifa == ifp) {
738 list_del_init(&ifp->if_list);
739 __in6_ifa_put(ifp);
740
741 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
742 break;
743 deleted = 1;
744 continue;
745 } else if (ifp->flags & IFA_F_PERMANENT) {
746 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
747 ifp->prefix_len)) {
748 if (ifa->flags & IFA_F_PERMANENT) {
749 onlink = 1;
750 if (deleted)
751 break;
752 } else {
753 unsigned long lifetime;
754
755 if (!onlink)
756 onlink = -1;
757
758 spin_lock(&ifa->lock);
759
760 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
761 /*
762 * Note: Because this address is
763 * not permanent, lifetime <
764 * LONG_MAX / HZ here.
765 */
766 if (time_before(expires,
767 ifa->tstamp + lifetime * HZ))
768 expires = ifa->tstamp + lifetime * HZ;
769 spin_unlock(&ifa->lock);
770 }
771 }
772 }
773 }
774 write_unlock_bh(&idev->lock);
775
776 addrconf_del_timer(ifp);
777
778 ipv6_ifa_notify(RTM_DELADDR, ifp);
779
780 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
781
782 /*
783 * Purge or update corresponding prefix
784 *
785 * 1) we don't purge prefix here if address was not permanent.
786 * prefix is managed by its own lifetime.
787 * 2) if there're no addresses, delete prefix.
788 * 3) if there're still other permanent address(es),
789 * corresponding prefix is still permanent.
790 * 4) otherwise, update prefix lifetime to the
791 * longest valid lifetime among the corresponding
792 * addresses on the device.
793 * Note: subsequent RA will update lifetime.
794 *
795 * --yoshfuji
796 */
797 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
798 struct in6_addr prefix;
799 struct rt6_info *rt;
800 struct net *net = dev_net(ifp->idev->dev);
801 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
802 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1);
803
804 if (rt && addrconf_is_prefix_route(rt)) {
805 if (onlink == 0) {
806 ip6_del_rt(rt);
807 rt = NULL;
808 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
809 rt->rt6i_expires = expires;
810 rt->rt6i_flags |= RTF_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 */
901 if (tmp_prefered_lft <= regen_advance) {
902 in6_ifa_put(ifp);
903 in6_dev_put(idev);
904 ret = -1;
905 goto out;
906 }
907
908 addr_flags = IFA_F_TEMPORARY;
909 /* set in addrconf_prefix_rcv() */
910 if (ifp->flags & IFA_F_OPTIMISTIC)
911 addr_flags |= IFA_F_OPTIMISTIC;
912
913 ift = !max_addresses ||
914 ipv6_count_addresses(idev) < max_addresses ?
915 ipv6_add_addr(idev, &addr, tmp_plen,
916 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
917 addr_flags) : NULL;
918 if (!ift || IS_ERR(ift)) {
919 in6_ifa_put(ifp);
920 in6_dev_put(idev);
921 printk(KERN_INFO
922 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
923 tmpaddr = &addr;
924 write_lock(&idev->lock);
925 goto retry;
926 }
927
928 spin_lock_bh(&ift->lock);
929 ift->ifpub = ifp;
930 ift->valid_lft = tmp_valid_lft;
931 ift->prefered_lft = tmp_prefered_lft;
932 ift->cstamp = now;
933 ift->tstamp = tmp_tstamp;
934 spin_unlock_bh(&ift->lock);
935
936 addrconf_dad_start(ift, 0);
937 in6_ifa_put(ift);
938 in6_dev_put(idev);
939 out:
940 return ret;
941 }
942 #endif
943
944 /*
945 * Choose an appropriate source address (RFC3484)
946 */
947 enum {
948 IPV6_SADDR_RULE_INIT = 0,
949 IPV6_SADDR_RULE_LOCAL,
950 IPV6_SADDR_RULE_SCOPE,
951 IPV6_SADDR_RULE_PREFERRED,
952 #ifdef CONFIG_IPV6_MIP6
953 IPV6_SADDR_RULE_HOA,
954 #endif
955 IPV6_SADDR_RULE_OIF,
956 IPV6_SADDR_RULE_LABEL,
957 #ifdef CONFIG_IPV6_PRIVACY
958 IPV6_SADDR_RULE_PRIVACY,
959 #endif
960 IPV6_SADDR_RULE_ORCHID,
961 IPV6_SADDR_RULE_PREFIX,
962 IPV6_SADDR_RULE_MAX
963 };
964
965 struct ipv6_saddr_score {
966 int rule;
967 int addr_type;
968 struct inet6_ifaddr *ifa;
969 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
970 int scopedist;
971 int matchlen;
972 };
973
974 struct ipv6_saddr_dst {
975 const struct in6_addr *addr;
976 int ifindex;
977 int scope;
978 int label;
979 unsigned int prefs;
980 };
981
982 static inline int ipv6_saddr_preferred(int type)
983 {
984 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
985 return 1;
986 return 0;
987 }
988
989 static int ipv6_get_saddr_eval(struct net *net,
990 struct ipv6_saddr_score *score,
991 struct ipv6_saddr_dst *dst,
992 int i)
993 {
994 int ret;
995
996 if (i <= score->rule) {
997 switch (i) {
998 case IPV6_SADDR_RULE_SCOPE:
999 ret = score->scopedist;
1000 break;
1001 case IPV6_SADDR_RULE_PREFIX:
1002 ret = score->matchlen;
1003 break;
1004 default:
1005 ret = !!test_bit(i, score->scorebits);
1006 }
1007 goto out;
1008 }
1009
1010 switch (i) {
1011 case IPV6_SADDR_RULE_INIT:
1012 /* Rule 0: remember if hiscore is not ready yet */
1013 ret = !!score->ifa;
1014 break;
1015 case IPV6_SADDR_RULE_LOCAL:
1016 /* Rule 1: Prefer same address */
1017 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1018 break;
1019 case IPV6_SADDR_RULE_SCOPE:
1020 /* Rule 2: Prefer appropriate scope
1021 *
1022 * ret
1023 * ^
1024 * -1 | d 15
1025 * ---+--+-+---> scope
1026 * |
1027 * | d is scope of the destination.
1028 * B-d | \
1029 * | \ <- smaller scope is better if
1030 * B-15 | \ if scope is enough for destinaion.
1031 * | ret = B - scope (-1 <= scope >= d <= 15).
1032 * d-C-1 | /
1033 * |/ <- greater is better
1034 * -C / if scope is not enough for destination.
1035 * /| ret = scope - C (-1 <= d < scope <= 15).
1036 *
1037 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1038 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1039 * Assume B = 0 and we get C > 29.
1040 */
1041 ret = __ipv6_addr_src_scope(score->addr_type);
1042 if (ret >= dst->scope)
1043 ret = -ret;
1044 else
1045 ret -= 128; /* 30 is enough */
1046 score->scopedist = ret;
1047 break;
1048 case IPV6_SADDR_RULE_PREFERRED:
1049 /* Rule 3: Avoid deprecated and optimistic addresses */
1050 ret = ipv6_saddr_preferred(score->addr_type) ||
1051 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1052 break;
1053 #ifdef CONFIG_IPV6_MIP6
1054 case IPV6_SADDR_RULE_HOA:
1055 {
1056 /* Rule 4: Prefer home address */
1057 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1058 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1059 break;
1060 }
1061 #endif
1062 case IPV6_SADDR_RULE_OIF:
1063 /* Rule 5: Prefer outgoing interface */
1064 ret = (!dst->ifindex ||
1065 dst->ifindex == score->ifa->idev->dev->ifindex);
1066 break;
1067 case IPV6_SADDR_RULE_LABEL:
1068 /* Rule 6: Prefer matching label */
1069 ret = ipv6_addr_label(net,
1070 &score->ifa->addr, score->addr_type,
1071 score->ifa->idev->dev->ifindex) == dst->label;
1072 break;
1073 #ifdef CONFIG_IPV6_PRIVACY
1074 case IPV6_SADDR_RULE_PRIVACY:
1075 {
1076 /* Rule 7: Prefer public address
1077 * Note: prefer temporary address if use_tempaddr >= 2
1078 */
1079 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1080 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1081 score->ifa->idev->cnf.use_tempaddr >= 2;
1082 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1083 break;
1084 }
1085 #endif
1086 case IPV6_SADDR_RULE_ORCHID:
1087 /* Rule 8-: Prefer ORCHID vs ORCHID or
1088 * non-ORCHID vs non-ORCHID
1089 */
1090 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1091 ipv6_addr_orchid(dst->addr));
1092 break;
1093 case IPV6_SADDR_RULE_PREFIX:
1094 /* Rule 8: Use longest matching prefix */
1095 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr,
1096 dst->addr);
1097 break;
1098 default:
1099 ret = 0;
1100 }
1101
1102 if (ret)
1103 __set_bit(i, score->scorebits);
1104 score->rule = i;
1105 out:
1106 return ret;
1107 }
1108
1109 int ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev,
1110 const struct in6_addr *daddr, unsigned int prefs,
1111 struct in6_addr *saddr)
1112 {
1113 struct ipv6_saddr_score scores[2],
1114 *score = &scores[0], *hiscore = &scores[1];
1115 struct ipv6_saddr_dst dst;
1116 struct net_device *dev;
1117 int dst_type;
1118
1119 dst_type = __ipv6_addr_type(daddr);
1120 dst.addr = daddr;
1121 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1122 dst.scope = __ipv6_addr_src_scope(dst_type);
1123 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1124 dst.prefs = prefs;
1125
1126 hiscore->rule = -1;
1127 hiscore->ifa = NULL;
1128
1129 rcu_read_lock();
1130
1131 for_each_netdev_rcu(net, dev) {
1132 struct inet6_dev *idev;
1133
1134 /* Candidate Source Address (section 4)
1135 * - multicast and link-local destination address,
1136 * the set of candidate source address MUST only
1137 * include addresses assigned to interfaces
1138 * belonging to the same link as the outgoing
1139 * interface.
1140 * (- For site-local destination addresses, the
1141 * set of candidate source addresses MUST only
1142 * include addresses assigned to interfaces
1143 * belonging to the same site as the outgoing
1144 * interface.)
1145 */
1146 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1147 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1148 dst.ifindex && dev->ifindex != dst.ifindex)
1149 continue;
1150
1151 idev = __in6_dev_get(dev);
1152 if (!idev)
1153 continue;
1154
1155 read_lock_bh(&idev->lock);
1156 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1157 int i;
1158
1159 /*
1160 * - Tentative Address (RFC2462 section 5.4)
1161 * - A tentative address is not considered
1162 * "assigned to an interface" in the traditional
1163 * sense, unless it is also flagged as optimistic.
1164 * - Candidate Source Address (section 4)
1165 * - In any case, anycast addresses, multicast
1166 * addresses, and the unspecified address MUST
1167 * NOT be included in a candidate set.
1168 */
1169 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1170 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1171 continue;
1172
1173 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1174
1175 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1176 score->addr_type & IPV6_ADDR_MULTICAST)) {
1177 LIMIT_NETDEBUG(KERN_DEBUG
1178 "ADDRCONF: unspecified / multicast address "
1179 "assigned as unicast address on %s",
1180 dev->name);
1181 continue;
1182 }
1183
1184 score->rule = -1;
1185 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1186
1187 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1188 int minihiscore, miniscore;
1189
1190 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1191 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1192
1193 if (minihiscore > miniscore) {
1194 if (i == IPV6_SADDR_RULE_SCOPE &&
1195 score->scopedist > 0) {
1196 /*
1197 * special case:
1198 * each remaining entry
1199 * has too small (not enough)
1200 * scope, because ifa entries
1201 * are sorted by their scope
1202 * values.
1203 */
1204 goto try_nextdev;
1205 }
1206 break;
1207 } else if (minihiscore < miniscore) {
1208 if (hiscore->ifa)
1209 in6_ifa_put(hiscore->ifa);
1210
1211 in6_ifa_hold(score->ifa);
1212
1213 swap(hiscore, score);
1214
1215 /* restore our iterator */
1216 score->ifa = hiscore->ifa;
1217
1218 break;
1219 }
1220 }
1221 }
1222 try_nextdev:
1223 read_unlock_bh(&idev->lock);
1224 }
1225 rcu_read_unlock();
1226
1227 if (!hiscore->ifa)
1228 return -EADDRNOTAVAIL;
1229
1230 ipv6_addr_copy(saddr, &hiscore->ifa->addr);
1231 in6_ifa_put(hiscore->ifa);
1232 return 0;
1233 }
1234 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1235
1236 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1237 unsigned char banned_flags)
1238 {
1239 struct inet6_dev *idev;
1240 int err = -EADDRNOTAVAIL;
1241
1242 rcu_read_lock();
1243 idev = __in6_dev_get(dev);
1244 if (idev) {
1245 struct inet6_ifaddr *ifp;
1246
1247 read_lock_bh(&idev->lock);
1248 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1249 if (ifp->scope == IFA_LINK &&
1250 !(ifp->flags & banned_flags)) {
1251 ipv6_addr_copy(addr, &ifp->addr);
1252 err = 0;
1253 break;
1254 }
1255 }
1256 read_unlock_bh(&idev->lock);
1257 }
1258 rcu_read_unlock();
1259 return err;
1260 }
1261
1262 static int ipv6_count_addresses(struct inet6_dev *idev)
1263 {
1264 int cnt = 0;
1265 struct inet6_ifaddr *ifp;
1266
1267 read_lock_bh(&idev->lock);
1268 list_for_each_entry(ifp, &idev->addr_list, if_list)
1269 cnt++;
1270 read_unlock_bh(&idev->lock);
1271 return cnt;
1272 }
1273
1274 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1275 struct net_device *dev, int strict)
1276 {
1277 struct inet6_ifaddr *ifp;
1278 struct hlist_node *node;
1279 unsigned int hash = ipv6_addr_hash(addr);
1280
1281 rcu_read_lock_bh();
1282 hlist_for_each_entry_rcu(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1283 if (!net_eq(dev_net(ifp->idev->dev), net))
1284 continue;
1285 if (ipv6_addr_equal(&ifp->addr, addr) &&
1286 !(ifp->flags&IFA_F_TENTATIVE) &&
1287 (dev == NULL || ifp->idev->dev == dev ||
1288 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1289 rcu_read_unlock_bh();
1290 return 1;
1291 }
1292 }
1293
1294 rcu_read_unlock_bh();
1295 return 0;
1296 }
1297 EXPORT_SYMBOL(ipv6_chk_addr);
1298
1299 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1300 struct net_device *dev)
1301 {
1302 unsigned int hash = ipv6_addr_hash(addr);
1303 struct inet6_ifaddr *ifp;
1304 struct hlist_node *node;
1305
1306 hlist_for_each_entry(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1307 if (!net_eq(dev_net(ifp->idev->dev), net))
1308 continue;
1309 if (ipv6_addr_equal(&ifp->addr, addr)) {
1310 if (dev == NULL || ifp->idev->dev == dev)
1311 return true;
1312 }
1313 }
1314 return false;
1315 }
1316
1317 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1318 {
1319 struct inet6_dev *idev;
1320 struct inet6_ifaddr *ifa;
1321 int onlink;
1322
1323 onlink = 0;
1324 rcu_read_lock();
1325 idev = __in6_dev_get(dev);
1326 if (idev) {
1327 read_lock_bh(&idev->lock);
1328 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1329 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1330 ifa->prefix_len);
1331 if (onlink)
1332 break;
1333 }
1334 read_unlock_bh(&idev->lock);
1335 }
1336 rcu_read_unlock();
1337 return onlink;
1338 }
1339
1340 EXPORT_SYMBOL(ipv6_chk_prefix);
1341
1342 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1343 struct net_device *dev, int strict)
1344 {
1345 struct inet6_ifaddr *ifp, *result = NULL;
1346 unsigned int hash = ipv6_addr_hash(addr);
1347 struct hlist_node *node;
1348
1349 rcu_read_lock_bh();
1350 hlist_for_each_entry_rcu_bh(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1351 if (!net_eq(dev_net(ifp->idev->dev), net))
1352 continue;
1353 if (ipv6_addr_equal(&ifp->addr, addr)) {
1354 if (dev == NULL || ifp->idev->dev == dev ||
1355 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1356 result = ifp;
1357 in6_ifa_hold(ifp);
1358 break;
1359 }
1360 }
1361 }
1362 rcu_read_unlock_bh();
1363
1364 return result;
1365 }
1366
1367 /* Gets referenced address, destroys ifaddr */
1368
1369 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1370 {
1371 if (ifp->flags&IFA_F_PERMANENT) {
1372 spin_lock_bh(&ifp->lock);
1373 addrconf_del_timer(ifp);
1374 ifp->flags |= IFA_F_TENTATIVE;
1375 if (dad_failed)
1376 ifp->flags |= IFA_F_DADFAILED;
1377 spin_unlock_bh(&ifp->lock);
1378 if (dad_failed)
1379 ipv6_ifa_notify(0, ifp);
1380 in6_ifa_put(ifp);
1381 #ifdef CONFIG_IPV6_PRIVACY
1382 } else if (ifp->flags&IFA_F_TEMPORARY) {
1383 struct inet6_ifaddr *ifpub;
1384 spin_lock_bh(&ifp->lock);
1385 ifpub = ifp->ifpub;
1386 if (ifpub) {
1387 in6_ifa_hold(ifpub);
1388 spin_unlock_bh(&ifp->lock);
1389 ipv6_create_tempaddr(ifpub, ifp);
1390 in6_ifa_put(ifpub);
1391 } else {
1392 spin_unlock_bh(&ifp->lock);
1393 }
1394 ipv6_del_addr(ifp);
1395 #endif
1396 } else
1397 ipv6_del_addr(ifp);
1398 }
1399
1400 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1401 {
1402 int err = -ENOENT;
1403
1404 spin_lock(&ifp->state_lock);
1405 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1406 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1407 err = 0;
1408 }
1409 spin_unlock(&ifp->state_lock);
1410
1411 return err;
1412 }
1413
1414 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1415 {
1416 struct inet6_dev *idev = ifp->idev;
1417
1418 if (addrconf_dad_end(ifp)) {
1419 in6_ifa_put(ifp);
1420 return;
1421 }
1422
1423 if (net_ratelimit())
1424 printk(KERN_INFO "%s: IPv6 duplicate address %pI6c detected!\n",
1425 ifp->idev->dev->name, &ifp->addr);
1426
1427 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1428 struct in6_addr addr;
1429
1430 addr.s6_addr32[0] = htonl(0xfe800000);
1431 addr.s6_addr32[1] = 0;
1432
1433 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1434 ipv6_addr_equal(&ifp->addr, &addr)) {
1435 /* DAD failed for link-local based on MAC address */
1436 idev->cnf.disable_ipv6 = 1;
1437
1438 printk(KERN_INFO "%s: IPv6 being disabled!\n",
1439 ifp->idev->dev->name);
1440 }
1441 }
1442
1443 addrconf_dad_stop(ifp, 1);
1444 }
1445
1446 /* Join to solicited addr multicast group. */
1447
1448 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1449 {
1450 struct in6_addr maddr;
1451
1452 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1453 return;
1454
1455 addrconf_addr_solict_mult(addr, &maddr);
1456 ipv6_dev_mc_inc(dev, &maddr);
1457 }
1458
1459 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1460 {
1461 struct in6_addr maddr;
1462
1463 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1464 return;
1465
1466 addrconf_addr_solict_mult(addr, &maddr);
1467 __ipv6_dev_mc_dec(idev, &maddr);
1468 }
1469
1470 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1471 {
1472 struct in6_addr addr;
1473 if (ifp->prefix_len == 127) /* RFC 6164 */
1474 return;
1475 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1476 if (ipv6_addr_any(&addr))
1477 return;
1478 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1479 }
1480
1481 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1482 {
1483 struct in6_addr addr;
1484 if (ifp->prefix_len == 127) /* RFC 6164 */
1485 return;
1486 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1487 if (ipv6_addr_any(&addr))
1488 return;
1489 __ipv6_dev_ac_dec(ifp->idev, &addr);
1490 }
1491
1492 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1493 {
1494 if (dev->addr_len != ETH_ALEN)
1495 return -1;
1496 memcpy(eui, dev->dev_addr, 3);
1497 memcpy(eui + 5, dev->dev_addr + 3, 3);
1498
1499 /*
1500 * The zSeries OSA network cards can be shared among various
1501 * OS instances, but the OSA cards have only one MAC address.
1502 * This leads to duplicate address conflicts in conjunction
1503 * with IPv6 if more than one instance uses the same card.
1504 *
1505 * The driver for these cards can deliver a unique 16-bit
1506 * identifier for each instance sharing the same card. It is
1507 * placed instead of 0xFFFE in the interface identifier. The
1508 * "u" bit of the interface identifier is not inverted in this
1509 * case. Hence the resulting interface identifier has local
1510 * scope according to RFC2373.
1511 */
1512 if (dev->dev_id) {
1513 eui[3] = (dev->dev_id >> 8) & 0xFF;
1514 eui[4] = dev->dev_id & 0xFF;
1515 } else {
1516 eui[3] = 0xFF;
1517 eui[4] = 0xFE;
1518 eui[0] ^= 2;
1519 }
1520 return 0;
1521 }
1522
1523 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1524 {
1525 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1526 if (dev->addr_len != ARCNET_ALEN)
1527 return -1;
1528 memset(eui, 0, 7);
1529 eui[7] = *(u8*)dev->dev_addr;
1530 return 0;
1531 }
1532
1533 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1534 {
1535 if (dev->addr_len != INFINIBAND_ALEN)
1536 return -1;
1537 memcpy(eui, dev->dev_addr + 12, 8);
1538 eui[0] |= 2;
1539 return 0;
1540 }
1541
1542 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1543 {
1544 if (addr == 0)
1545 return -1;
1546 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1547 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1548 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1549 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1550 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1551 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1552 eui[1] = 0;
1553 eui[2] = 0x5E;
1554 eui[3] = 0xFE;
1555 memcpy(eui + 4, &addr, 4);
1556 return 0;
1557 }
1558
1559 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1560 {
1561 if (dev->priv_flags & IFF_ISATAP)
1562 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1563 return -1;
1564 }
1565
1566 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
1567 {
1568 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1569 }
1570
1571 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1572 {
1573 switch (dev->type) {
1574 case ARPHRD_ETHER:
1575 case ARPHRD_FDDI:
1576 case ARPHRD_IEEE802_TR:
1577 return addrconf_ifid_eui48(eui, dev);
1578 case ARPHRD_ARCNET:
1579 return addrconf_ifid_arcnet(eui, dev);
1580 case ARPHRD_INFINIBAND:
1581 return addrconf_ifid_infiniband(eui, dev);
1582 case ARPHRD_SIT:
1583 return addrconf_ifid_sit(eui, dev);
1584 case ARPHRD_IPGRE:
1585 return addrconf_ifid_gre(eui, dev);
1586 }
1587 return -1;
1588 }
1589
1590 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1591 {
1592 int err = -1;
1593 struct inet6_ifaddr *ifp;
1594
1595 read_lock_bh(&idev->lock);
1596 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1597 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1598 memcpy(eui, ifp->addr.s6_addr+8, 8);
1599 err = 0;
1600 break;
1601 }
1602 }
1603 read_unlock_bh(&idev->lock);
1604 return err;
1605 }
1606
1607 #ifdef CONFIG_IPV6_PRIVACY
1608 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1609 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1610 {
1611 regen:
1612 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1613 idev->rndid[0] &= ~0x02;
1614
1615 /*
1616 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1617 * check if generated address is not inappropriate
1618 *
1619 * - Reserved subnet anycast (RFC 2526)
1620 * 11111101 11....11 1xxxxxxx
1621 * - ISATAP (RFC4214) 6.1
1622 * 00-00-5E-FE-xx-xx-xx-xx
1623 * - value 0
1624 * - XXX: already assigned to an address on the device
1625 */
1626 if (idev->rndid[0] == 0xfd &&
1627 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1628 (idev->rndid[7]&0x80))
1629 goto regen;
1630 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1631 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1632 goto regen;
1633 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1634 goto regen;
1635 }
1636
1637 return 0;
1638 }
1639
1640 static void ipv6_regen_rndid(unsigned long data)
1641 {
1642 struct inet6_dev *idev = (struct inet6_dev *) data;
1643 unsigned long expires;
1644
1645 rcu_read_lock_bh();
1646 write_lock_bh(&idev->lock);
1647
1648 if (idev->dead)
1649 goto out;
1650
1651 if (__ipv6_regen_rndid(idev) < 0)
1652 goto out;
1653
1654 expires = jiffies +
1655 idev->cnf.temp_prefered_lft * HZ -
1656 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time -
1657 idev->cnf.max_desync_factor * HZ;
1658 if (time_before(expires, jiffies)) {
1659 printk(KERN_WARNING
1660 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1661 idev->dev->name);
1662 goto out;
1663 }
1664
1665 if (!mod_timer(&idev->regen_timer, expires))
1666 in6_dev_hold(idev);
1667
1668 out:
1669 write_unlock_bh(&idev->lock);
1670 rcu_read_unlock_bh();
1671 in6_dev_put(idev);
1672 }
1673
1674 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1675 int ret = 0;
1676
1677 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1678 ret = __ipv6_regen_rndid(idev);
1679 return ret;
1680 }
1681 #endif
1682
1683 /*
1684 * Add prefix route.
1685 */
1686
1687 static void
1688 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1689 unsigned long expires, u32 flags)
1690 {
1691 struct fib6_config cfg = {
1692 .fc_table = RT6_TABLE_PREFIX,
1693 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1694 .fc_ifindex = dev->ifindex,
1695 .fc_expires = expires,
1696 .fc_dst_len = plen,
1697 .fc_flags = RTF_UP | flags,
1698 .fc_nlinfo.nl_net = dev_net(dev),
1699 .fc_protocol = RTPROT_KERNEL,
1700 };
1701
1702 ipv6_addr_copy(&cfg.fc_dst, pfx);
1703
1704 /* Prevent useless cloning on PtP SIT.
1705 This thing is done here expecting that the whole
1706 class of non-broadcast devices need not cloning.
1707 */
1708 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1709 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1710 cfg.fc_flags |= RTF_NONEXTHOP;
1711 #endif
1712
1713 ip6_route_add(&cfg);
1714 }
1715
1716 /* Create "default" multicast route to the interface */
1717
1718 static void addrconf_add_mroute(struct net_device *dev)
1719 {
1720 struct fib6_config cfg = {
1721 .fc_table = RT6_TABLE_LOCAL,
1722 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1723 .fc_ifindex = dev->ifindex,
1724 .fc_dst_len = 8,
1725 .fc_flags = RTF_UP,
1726 .fc_nlinfo.nl_net = dev_net(dev),
1727 };
1728
1729 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1730
1731 ip6_route_add(&cfg);
1732 }
1733
1734 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1735 static void sit_route_add(struct net_device *dev)
1736 {
1737 struct fib6_config cfg = {
1738 .fc_table = RT6_TABLE_MAIN,
1739 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1740 .fc_ifindex = dev->ifindex,
1741 .fc_dst_len = 96,
1742 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1743 .fc_nlinfo.nl_net = dev_net(dev),
1744 };
1745
1746 /* prefix length - 96 bits "::d.d.d.d" */
1747 ip6_route_add(&cfg);
1748 }
1749 #endif
1750
1751 static void addrconf_add_lroute(struct net_device *dev)
1752 {
1753 struct in6_addr addr;
1754
1755 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1756 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1757 }
1758
1759 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1760 {
1761 struct inet6_dev *idev;
1762
1763 ASSERT_RTNL();
1764
1765 idev = ipv6_find_idev(dev);
1766 if (!idev)
1767 return ERR_PTR(-ENOBUFS);
1768
1769 if (idev->cnf.disable_ipv6)
1770 return ERR_PTR(-EACCES);
1771
1772 /* Add default multicast route */
1773 addrconf_add_mroute(dev);
1774
1775 /* Add link local route */
1776 addrconf_add_lroute(dev);
1777 return idev;
1778 }
1779
1780 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1781 {
1782 struct prefix_info *pinfo;
1783 __u32 valid_lft;
1784 __u32 prefered_lft;
1785 int addr_type;
1786 struct inet6_dev *in6_dev;
1787 struct net *net = dev_net(dev);
1788
1789 pinfo = (struct prefix_info *) opt;
1790
1791 if (len < sizeof(struct prefix_info)) {
1792 ADBG(("addrconf: prefix option too short\n"));
1793 return;
1794 }
1795
1796 /*
1797 * Validation checks ([ADDRCONF], page 19)
1798 */
1799
1800 addr_type = ipv6_addr_type(&pinfo->prefix);
1801
1802 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1803 return;
1804
1805 valid_lft = ntohl(pinfo->valid);
1806 prefered_lft = ntohl(pinfo->prefered);
1807
1808 if (prefered_lft > valid_lft) {
1809 if (net_ratelimit())
1810 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1811 return;
1812 }
1813
1814 in6_dev = in6_dev_get(dev);
1815
1816 if (in6_dev == NULL) {
1817 if (net_ratelimit())
1818 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1819 return;
1820 }
1821
1822 /*
1823 * Two things going on here:
1824 * 1) Add routes for on-link prefixes
1825 * 2) Configure prefixes with the auto flag set
1826 */
1827
1828 if (pinfo->onlink) {
1829 struct rt6_info *rt;
1830 unsigned long rt_expires;
1831
1832 /* Avoid arithmetic overflow. Really, we could
1833 * save rt_expires in seconds, likely valid_lft,
1834 * but it would require division in fib gc, that it
1835 * not good.
1836 */
1837 if (HZ > USER_HZ)
1838 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
1839 else
1840 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
1841
1842 if (addrconf_finite_timeout(rt_expires))
1843 rt_expires *= HZ;
1844
1845 rt = rt6_lookup(net, &pinfo->prefix, NULL,
1846 dev->ifindex, 1);
1847
1848 if (rt && addrconf_is_prefix_route(rt)) {
1849 /* Autoconf prefix route */
1850 if (valid_lft == 0) {
1851 ip6_del_rt(rt);
1852 rt = NULL;
1853 } else if (addrconf_finite_timeout(rt_expires)) {
1854 /* not infinity */
1855 rt->rt6i_expires = jiffies + rt_expires;
1856 rt->rt6i_flags |= RTF_EXPIRES;
1857 } else {
1858 rt->rt6i_flags &= ~RTF_EXPIRES;
1859 rt->rt6i_expires = 0;
1860 }
1861 } else if (valid_lft) {
1862 clock_t expires = 0;
1863 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
1864 if (addrconf_finite_timeout(rt_expires)) {
1865 /* not infinity */
1866 flags |= RTF_EXPIRES;
1867 expires = jiffies_to_clock_t(rt_expires);
1868 }
1869 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1870 dev, expires, flags);
1871 }
1872 if (rt)
1873 dst_release(&rt->dst);
1874 }
1875
1876 /* Try to figure out our local address for this prefix */
1877
1878 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1879 struct inet6_ifaddr * ifp;
1880 struct in6_addr addr;
1881 int create = 0, update_lft = 0;
1882
1883 if (pinfo->prefix_len == 64) {
1884 memcpy(&addr, &pinfo->prefix, 8);
1885 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1886 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1887 in6_dev_put(in6_dev);
1888 return;
1889 }
1890 goto ok;
1891 }
1892 if (net_ratelimit())
1893 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1894 pinfo->prefix_len);
1895 in6_dev_put(in6_dev);
1896 return;
1897
1898 ok:
1899
1900 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1901
1902 if (ifp == NULL && valid_lft) {
1903 int max_addresses = in6_dev->cnf.max_addresses;
1904 u32 addr_flags = 0;
1905
1906 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1907 if (in6_dev->cnf.optimistic_dad &&
1908 !net->ipv6.devconf_all->forwarding)
1909 addr_flags = IFA_F_OPTIMISTIC;
1910 #endif
1911
1912 /* Do not allow to create too much of autoconfigured
1913 * addresses; this would be too easy way to crash kernel.
1914 */
1915 if (!max_addresses ||
1916 ipv6_count_addresses(in6_dev) < max_addresses)
1917 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1918 addr_type&IPV6_ADDR_SCOPE_MASK,
1919 addr_flags);
1920
1921 if (!ifp || IS_ERR(ifp)) {
1922 in6_dev_put(in6_dev);
1923 return;
1924 }
1925
1926 update_lft = create = 1;
1927 ifp->cstamp = jiffies;
1928 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1929 }
1930
1931 if (ifp) {
1932 int flags;
1933 unsigned long now;
1934 #ifdef CONFIG_IPV6_PRIVACY
1935 struct inet6_ifaddr *ift;
1936 #endif
1937 u32 stored_lft;
1938
1939 /* update lifetime (RFC2462 5.5.3 e) */
1940 spin_lock(&ifp->lock);
1941 now = jiffies;
1942 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1943 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1944 else
1945 stored_lft = 0;
1946 if (!update_lft && stored_lft) {
1947 if (valid_lft > MIN_VALID_LIFETIME ||
1948 valid_lft > stored_lft)
1949 update_lft = 1;
1950 else if (stored_lft <= MIN_VALID_LIFETIME) {
1951 /* valid_lft <= stored_lft is always true */
1952 /*
1953 * RFC 4862 Section 5.5.3e:
1954 * "Note that the preferred lifetime of
1955 * the corresponding address is always
1956 * reset to the Preferred Lifetime in
1957 * the received Prefix Information
1958 * option, regardless of whether the
1959 * valid lifetime is also reset or
1960 * ignored."
1961 *
1962 * So if the preferred lifetime in
1963 * this advertisement is different
1964 * than what we have stored, but the
1965 * valid lifetime is invalid, just
1966 * reset prefered_lft.
1967 *
1968 * We must set the valid lifetime
1969 * to the stored lifetime since we'll
1970 * be updating the timestamp below,
1971 * else we'll set it back to the
1972 * minimum.
1973 */
1974 if (prefered_lft != ifp->prefered_lft) {
1975 valid_lft = stored_lft;
1976 update_lft = 1;
1977 }
1978 } else {
1979 valid_lft = MIN_VALID_LIFETIME;
1980 if (valid_lft < prefered_lft)
1981 prefered_lft = valid_lft;
1982 update_lft = 1;
1983 }
1984 }
1985
1986 if (update_lft) {
1987 ifp->valid_lft = valid_lft;
1988 ifp->prefered_lft = prefered_lft;
1989 ifp->tstamp = now;
1990 flags = ifp->flags;
1991 ifp->flags &= ~IFA_F_DEPRECATED;
1992 spin_unlock(&ifp->lock);
1993
1994 if (!(flags&IFA_F_TENTATIVE))
1995 ipv6_ifa_notify(0, ifp);
1996 } else
1997 spin_unlock(&ifp->lock);
1998
1999 #ifdef CONFIG_IPV6_PRIVACY
2000 read_lock_bh(&in6_dev->lock);
2001 /* update all temporary addresses in the list */
2002 list_for_each_entry(ift, &in6_dev->tempaddr_list,
2003 tmp_list) {
2004 int age, max_valid, max_prefered;
2005
2006 if (ifp != ift->ifpub)
2007 continue;
2008
2009 /*
2010 * RFC 4941 section 3.3:
2011 * If a received option will extend the lifetime
2012 * of a public address, the lifetimes of
2013 * temporary addresses should be extended,
2014 * subject to the overall constraint that no
2015 * temporary addresses should ever remain
2016 * "valid" or "preferred" for a time longer than
2017 * (TEMP_VALID_LIFETIME) or
2018 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR),
2019 * respectively.
2020 */
2021 age = (now - ift->cstamp) / HZ;
2022 max_valid = in6_dev->cnf.temp_valid_lft - age;
2023 if (max_valid < 0)
2024 max_valid = 0;
2025
2026 max_prefered = in6_dev->cnf.temp_prefered_lft -
2027 in6_dev->cnf.max_desync_factor -
2028 age;
2029 if (max_prefered < 0)
2030 max_prefered = 0;
2031
2032 if (valid_lft > max_valid)
2033 valid_lft = max_valid;
2034
2035 if (prefered_lft > max_prefered)
2036 prefered_lft = max_prefered;
2037
2038 spin_lock(&ift->lock);
2039 flags = ift->flags;
2040 ift->valid_lft = valid_lft;
2041 ift->prefered_lft = prefered_lft;
2042 ift->tstamp = now;
2043 if (prefered_lft > 0)
2044 ift->flags &= ~IFA_F_DEPRECATED;
2045
2046 spin_unlock(&ift->lock);
2047 if (!(flags&IFA_F_TENTATIVE))
2048 ipv6_ifa_notify(0, ift);
2049 }
2050
2051 if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) {
2052 /*
2053 * When a new public address is created as
2054 * described in [ADDRCONF], also create a new
2055 * temporary address. Also create a temporary
2056 * address if it's enabled but no temporary
2057 * address currently exists.
2058 */
2059 read_unlock_bh(&in6_dev->lock);
2060 ipv6_create_tempaddr(ifp, NULL);
2061 } else {
2062 read_unlock_bh(&in6_dev->lock);
2063 }
2064 #endif
2065 in6_ifa_put(ifp);
2066 addrconf_verify(0);
2067 }
2068 }
2069 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2070 in6_dev_put(in6_dev);
2071 }
2072
2073 /*
2074 * Set destination address.
2075 * Special case for SIT interfaces where we create a new "virtual"
2076 * device.
2077 */
2078 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2079 {
2080 struct in6_ifreq ireq;
2081 struct net_device *dev;
2082 int err = -EINVAL;
2083
2084 rtnl_lock();
2085
2086 err = -EFAULT;
2087 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2088 goto err_exit;
2089
2090 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2091
2092 err = -ENODEV;
2093 if (dev == NULL)
2094 goto err_exit;
2095
2096 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2097 if (dev->type == ARPHRD_SIT) {
2098 const struct net_device_ops *ops = dev->netdev_ops;
2099 struct ifreq ifr;
2100 struct ip_tunnel_parm p;
2101
2102 err = -EADDRNOTAVAIL;
2103 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2104 goto err_exit;
2105
2106 memset(&p, 0, sizeof(p));
2107 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2108 p.iph.saddr = 0;
2109 p.iph.version = 4;
2110 p.iph.ihl = 5;
2111 p.iph.protocol = IPPROTO_IPV6;
2112 p.iph.ttl = 64;
2113 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2114
2115 if (ops->ndo_do_ioctl) {
2116 mm_segment_t oldfs = get_fs();
2117
2118 set_fs(KERNEL_DS);
2119 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2120 set_fs(oldfs);
2121 } else
2122 err = -EOPNOTSUPP;
2123
2124 if (err == 0) {
2125 err = -ENOBUFS;
2126 dev = __dev_get_by_name(net, p.name);
2127 if (!dev)
2128 goto err_exit;
2129 err = dev_open(dev);
2130 }
2131 }
2132 #endif
2133
2134 err_exit:
2135 rtnl_unlock();
2136 return err;
2137 }
2138
2139 /*
2140 * Manual configuration of address on an interface
2141 */
2142 static int inet6_addr_add(struct net *net, int ifindex, const struct in6_addr *pfx,
2143 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
2144 __u32 valid_lft)
2145 {
2146 struct inet6_ifaddr *ifp;
2147 struct inet6_dev *idev;
2148 struct net_device *dev;
2149 int scope;
2150 u32 flags;
2151 clock_t expires;
2152 unsigned long timeout;
2153
2154 ASSERT_RTNL();
2155
2156 if (plen > 128)
2157 return -EINVAL;
2158
2159 /* check the lifetime */
2160 if (!valid_lft || prefered_lft > valid_lft)
2161 return -EINVAL;
2162
2163 dev = __dev_get_by_index(net, ifindex);
2164 if (!dev)
2165 return -ENODEV;
2166
2167 idev = addrconf_add_dev(dev);
2168 if (IS_ERR(idev))
2169 return PTR_ERR(idev);
2170
2171 scope = ipv6_addr_scope(pfx);
2172
2173 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2174 if (addrconf_finite_timeout(timeout)) {
2175 expires = jiffies_to_clock_t(timeout * HZ);
2176 valid_lft = timeout;
2177 flags = RTF_EXPIRES;
2178 } else {
2179 expires = 0;
2180 flags = 0;
2181 ifa_flags |= IFA_F_PERMANENT;
2182 }
2183
2184 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2185 if (addrconf_finite_timeout(timeout)) {
2186 if (timeout == 0)
2187 ifa_flags |= IFA_F_DEPRECATED;
2188 prefered_lft = timeout;
2189 }
2190
2191 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2192
2193 if (!IS_ERR(ifp)) {
2194 spin_lock_bh(&ifp->lock);
2195 ifp->valid_lft = valid_lft;
2196 ifp->prefered_lft = prefered_lft;
2197 ifp->tstamp = jiffies;
2198 spin_unlock_bh(&ifp->lock);
2199
2200 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2201 expires, flags);
2202 /*
2203 * Note that section 3.1 of RFC 4429 indicates
2204 * that the Optimistic flag should not be set for
2205 * manually configured addresses
2206 */
2207 addrconf_dad_start(ifp, 0);
2208 in6_ifa_put(ifp);
2209 addrconf_verify(0);
2210 return 0;
2211 }
2212
2213 return PTR_ERR(ifp);
2214 }
2215
2216 static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx,
2217 unsigned int plen)
2218 {
2219 struct inet6_ifaddr *ifp;
2220 struct inet6_dev *idev;
2221 struct net_device *dev;
2222
2223 if (plen > 128)
2224 return -EINVAL;
2225
2226 dev = __dev_get_by_index(net, ifindex);
2227 if (!dev)
2228 return -ENODEV;
2229
2230 if ((idev = __in6_dev_get(dev)) == NULL)
2231 return -ENXIO;
2232
2233 read_lock_bh(&idev->lock);
2234 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2235 if (ifp->prefix_len == plen &&
2236 ipv6_addr_equal(pfx, &ifp->addr)) {
2237 in6_ifa_hold(ifp);
2238 read_unlock_bh(&idev->lock);
2239
2240 ipv6_del_addr(ifp);
2241
2242 /* If the last address is deleted administratively,
2243 disable IPv6 on this interface.
2244 */
2245 if (list_empty(&idev->addr_list))
2246 addrconf_ifdown(idev->dev, 1);
2247 return 0;
2248 }
2249 }
2250 read_unlock_bh(&idev->lock);
2251 return -EADDRNOTAVAIL;
2252 }
2253
2254
2255 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2256 {
2257 struct in6_ifreq ireq;
2258 int err;
2259
2260 if (!capable(CAP_NET_ADMIN))
2261 return -EPERM;
2262
2263 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2264 return -EFAULT;
2265
2266 rtnl_lock();
2267 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2268 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2269 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2270 rtnl_unlock();
2271 return err;
2272 }
2273
2274 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2275 {
2276 struct in6_ifreq ireq;
2277 int err;
2278
2279 if (!capable(CAP_NET_ADMIN))
2280 return -EPERM;
2281
2282 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2283 return -EFAULT;
2284
2285 rtnl_lock();
2286 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2287 ireq.ifr6_prefixlen);
2288 rtnl_unlock();
2289 return err;
2290 }
2291
2292 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2293 int plen, int scope)
2294 {
2295 struct inet6_ifaddr *ifp;
2296
2297 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT);
2298 if (!IS_ERR(ifp)) {
2299 spin_lock_bh(&ifp->lock);
2300 ifp->flags &= ~IFA_F_TENTATIVE;
2301 spin_unlock_bh(&ifp->lock);
2302 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2303 in6_ifa_put(ifp);
2304 }
2305 }
2306
2307 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2308 static void sit_add_v4_addrs(struct inet6_dev *idev)
2309 {
2310 struct in6_addr addr;
2311 struct net_device *dev;
2312 struct net *net = dev_net(idev->dev);
2313 int scope;
2314
2315 ASSERT_RTNL();
2316
2317 memset(&addr, 0, sizeof(struct in6_addr));
2318 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2319
2320 if (idev->dev->flags&IFF_POINTOPOINT) {
2321 addr.s6_addr32[0] = htonl(0xfe800000);
2322 scope = IFA_LINK;
2323 } else {
2324 scope = IPV6_ADDR_COMPATv4;
2325 }
2326
2327 if (addr.s6_addr32[3]) {
2328 add_addr(idev, &addr, 128, scope);
2329 return;
2330 }
2331
2332 for_each_netdev(net, dev) {
2333 struct in_device * in_dev = __in_dev_get_rtnl(dev);
2334 if (in_dev && (dev->flags & IFF_UP)) {
2335 struct in_ifaddr * ifa;
2336
2337 int flag = scope;
2338
2339 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2340 int plen;
2341
2342 addr.s6_addr32[3] = ifa->ifa_local;
2343
2344 if (ifa->ifa_scope == RT_SCOPE_LINK)
2345 continue;
2346 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2347 if (idev->dev->flags&IFF_POINTOPOINT)
2348 continue;
2349 flag |= IFA_HOST;
2350 }
2351 if (idev->dev->flags&IFF_POINTOPOINT)
2352 plen = 64;
2353 else
2354 plen = 96;
2355
2356 add_addr(idev, &addr, plen, flag);
2357 }
2358 }
2359 }
2360 }
2361 #endif
2362
2363 static void init_loopback(struct net_device *dev)
2364 {
2365 struct inet6_dev *idev;
2366
2367 /* ::1 */
2368
2369 ASSERT_RTNL();
2370
2371 if ((idev = ipv6_find_idev(dev)) == NULL) {
2372 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2373 return;
2374 }
2375
2376 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2377 }
2378
2379 static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr)
2380 {
2381 struct inet6_ifaddr * ifp;
2382 u32 addr_flags = IFA_F_PERMANENT;
2383
2384 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2385 if (idev->cnf.optimistic_dad &&
2386 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2387 addr_flags |= IFA_F_OPTIMISTIC;
2388 #endif
2389
2390
2391 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2392 if (!IS_ERR(ifp)) {
2393 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2394 addrconf_dad_start(ifp, 0);
2395 in6_ifa_put(ifp);
2396 }
2397 }
2398
2399 static void addrconf_dev_config(struct net_device *dev)
2400 {
2401 struct in6_addr addr;
2402 struct inet6_dev * idev;
2403
2404 ASSERT_RTNL();
2405
2406 if ((dev->type != ARPHRD_ETHER) &&
2407 (dev->type != ARPHRD_FDDI) &&
2408 (dev->type != ARPHRD_IEEE802_TR) &&
2409 (dev->type != ARPHRD_ARCNET) &&
2410 (dev->type != ARPHRD_INFINIBAND)) {
2411 /* Alas, we support only Ethernet autoconfiguration. */
2412 return;
2413 }
2414
2415 idev = addrconf_add_dev(dev);
2416 if (IS_ERR(idev))
2417 return;
2418
2419 memset(&addr, 0, sizeof(struct in6_addr));
2420 addr.s6_addr32[0] = htonl(0xFE800000);
2421
2422 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2423 addrconf_add_linklocal(idev, &addr);
2424 }
2425
2426 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2427 static void addrconf_sit_config(struct net_device *dev)
2428 {
2429 struct inet6_dev *idev;
2430
2431 ASSERT_RTNL();
2432
2433 /*
2434 * Configure the tunnel with one of our IPv4
2435 * addresses... we should configure all of
2436 * our v4 addrs in the tunnel
2437 */
2438
2439 if ((idev = ipv6_find_idev(dev)) == NULL) {
2440 printk(KERN_DEBUG "init sit: add_dev failed\n");
2441 return;
2442 }
2443
2444 if (dev->priv_flags & IFF_ISATAP) {
2445 struct in6_addr addr;
2446
2447 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2448 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2449 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2450 addrconf_add_linklocal(idev, &addr);
2451 return;
2452 }
2453
2454 sit_add_v4_addrs(idev);
2455
2456 if (dev->flags&IFF_POINTOPOINT) {
2457 addrconf_add_mroute(dev);
2458 addrconf_add_lroute(dev);
2459 } else
2460 sit_route_add(dev);
2461 }
2462 #endif
2463
2464 #if defined(CONFIG_NET_IPGRE) || defined(CONFIG_NET_IPGRE_MODULE)
2465 static void addrconf_gre_config(struct net_device *dev)
2466 {
2467 struct inet6_dev *idev;
2468 struct in6_addr addr;
2469
2470 pr_info("ipv6: addrconf_gre_config(%s)\n", dev->name);
2471
2472 ASSERT_RTNL();
2473
2474 if ((idev = ipv6_find_idev(dev)) == NULL) {
2475 printk(KERN_DEBUG "init gre: add_dev failed\n");
2476 return;
2477 }
2478
2479 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2480 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2481
2482 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2483 addrconf_add_linklocal(idev, &addr);
2484 }
2485 #endif
2486
2487 static inline int
2488 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2489 {
2490 struct in6_addr lladdr;
2491
2492 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2493 addrconf_add_linklocal(idev, &lladdr);
2494 return 0;
2495 }
2496 return -1;
2497 }
2498
2499 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2500 {
2501 struct net_device *link_dev;
2502 struct net *net = dev_net(idev->dev);
2503
2504 /* first try to inherit the link-local address from the link device */
2505 if (idev->dev->iflink &&
2506 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
2507 if (!ipv6_inherit_linklocal(idev, link_dev))
2508 return;
2509 }
2510 /* then try to inherit it from any device */
2511 for_each_netdev(net, link_dev) {
2512 if (!ipv6_inherit_linklocal(idev, link_dev))
2513 return;
2514 }
2515 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2516 }
2517
2518 /*
2519 * Autoconfigure tunnel with a link-local address so routing protocols,
2520 * DHCPv6, MLD etc. can be run over the virtual link
2521 */
2522
2523 static void addrconf_ip6_tnl_config(struct net_device *dev)
2524 {
2525 struct inet6_dev *idev;
2526
2527 ASSERT_RTNL();
2528
2529 idev = addrconf_add_dev(dev);
2530 if (IS_ERR(idev)) {
2531 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2532 return;
2533 }
2534 ip6_tnl_add_linklocal(idev);
2535 }
2536
2537 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2538 void * data)
2539 {
2540 struct net_device *dev = (struct net_device *) data;
2541 struct inet6_dev *idev = __in6_dev_get(dev);
2542 int run_pending = 0;
2543 int err;
2544
2545 switch (event) {
2546 case NETDEV_REGISTER:
2547 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2548 idev = ipv6_add_dev(dev);
2549 if (!idev)
2550 return notifier_from_errno(-ENOMEM);
2551 }
2552 break;
2553
2554 case NETDEV_UP:
2555 case NETDEV_CHANGE:
2556 if (dev->flags & IFF_SLAVE)
2557 break;
2558
2559 if (event == NETDEV_UP) {
2560 if (!addrconf_qdisc_ok(dev)) {
2561 /* device is not ready yet. */
2562 printk(KERN_INFO
2563 "ADDRCONF(NETDEV_UP): %s: "
2564 "link is not ready\n",
2565 dev->name);
2566 break;
2567 }
2568
2569 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2570 idev = ipv6_add_dev(dev);
2571
2572 if (idev) {
2573 idev->if_flags |= IF_READY;
2574 run_pending = 1;
2575 }
2576 } else {
2577 if (!addrconf_qdisc_ok(dev)) {
2578 /* device is still not ready. */
2579 break;
2580 }
2581
2582 if (idev) {
2583 if (idev->if_flags & IF_READY)
2584 /* device is already configured. */
2585 break;
2586 idev->if_flags |= IF_READY;
2587 }
2588
2589 printk(KERN_INFO
2590 "ADDRCONF(NETDEV_CHANGE): %s: "
2591 "link becomes ready\n",
2592 dev->name);
2593
2594 run_pending = 1;
2595 }
2596
2597 switch (dev->type) {
2598 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2599 case ARPHRD_SIT:
2600 addrconf_sit_config(dev);
2601 break;
2602 #endif
2603 #if defined(CONFIG_NET_IPGRE) || defined(CONFIG_NET_IPGRE_MODULE)
2604 case ARPHRD_IPGRE:
2605 addrconf_gre_config(dev);
2606 break;
2607 #endif
2608 case ARPHRD_TUNNEL6:
2609 addrconf_ip6_tnl_config(dev);
2610 break;
2611 case ARPHRD_LOOPBACK:
2612 init_loopback(dev);
2613 break;
2614
2615 default:
2616 addrconf_dev_config(dev);
2617 break;
2618 }
2619
2620 if (idev) {
2621 if (run_pending)
2622 addrconf_dad_run(idev);
2623
2624 /*
2625 * If the MTU changed during the interface down,
2626 * when the interface up, the changed MTU must be
2627 * reflected in the idev as well as routers.
2628 */
2629 if (idev->cnf.mtu6 != dev->mtu &&
2630 dev->mtu >= IPV6_MIN_MTU) {
2631 rt6_mtu_change(dev, dev->mtu);
2632 idev->cnf.mtu6 = dev->mtu;
2633 }
2634 idev->tstamp = jiffies;
2635 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2636
2637 /*
2638 * If the changed mtu during down is lower than
2639 * IPV6_MIN_MTU stop IPv6 on this interface.
2640 */
2641 if (dev->mtu < IPV6_MIN_MTU)
2642 addrconf_ifdown(dev, 1);
2643 }
2644 break;
2645
2646 case NETDEV_CHANGEMTU:
2647 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2648 rt6_mtu_change(dev, dev->mtu);
2649 idev->cnf.mtu6 = dev->mtu;
2650 break;
2651 }
2652
2653 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2654 idev = ipv6_add_dev(dev);
2655 if (idev)
2656 break;
2657 }
2658
2659 /*
2660 * MTU falled under IPV6_MIN_MTU.
2661 * Stop IPv6 on this interface.
2662 */
2663
2664 case NETDEV_DOWN:
2665 case NETDEV_UNREGISTER:
2666 /*
2667 * Remove all addresses from this interface.
2668 */
2669 addrconf_ifdown(dev, event != NETDEV_DOWN);
2670 break;
2671
2672 case NETDEV_CHANGENAME:
2673 if (idev) {
2674 snmp6_unregister_dev(idev);
2675 addrconf_sysctl_unregister(idev);
2676 addrconf_sysctl_register(idev);
2677 err = snmp6_register_dev(idev);
2678 if (err)
2679 return notifier_from_errno(err);
2680 }
2681 break;
2682
2683 case NETDEV_PRE_TYPE_CHANGE:
2684 case NETDEV_POST_TYPE_CHANGE:
2685 addrconf_type_change(dev, event);
2686 break;
2687 }
2688
2689 return NOTIFY_OK;
2690 }
2691
2692 /*
2693 * addrconf module should be notified of a device going up
2694 */
2695 static struct notifier_block ipv6_dev_notf = {
2696 .notifier_call = addrconf_notify,
2697 };
2698
2699 static void addrconf_type_change(struct net_device *dev, unsigned long event)
2700 {
2701 struct inet6_dev *idev;
2702 ASSERT_RTNL();
2703
2704 idev = __in6_dev_get(dev);
2705
2706 if (event == NETDEV_POST_TYPE_CHANGE)
2707 ipv6_mc_remap(idev);
2708 else if (event == NETDEV_PRE_TYPE_CHANGE)
2709 ipv6_mc_unmap(idev);
2710 }
2711
2712 static int addrconf_ifdown(struct net_device *dev, int how)
2713 {
2714 struct net *net = dev_net(dev);
2715 struct inet6_dev *idev;
2716 struct inet6_ifaddr *ifa;
2717 int state, i;
2718
2719 ASSERT_RTNL();
2720
2721 rt6_ifdown(net, dev);
2722 neigh_ifdown(&nd_tbl, dev);
2723
2724 idev = __in6_dev_get(dev);
2725 if (idev == NULL)
2726 return -ENODEV;
2727
2728 /*
2729 * Step 1: remove reference to ipv6 device from parent device.
2730 * Do not dev_put!
2731 */
2732 if (how) {
2733 idev->dead = 1;
2734
2735 /* protected by rtnl_lock */
2736 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
2737
2738 /* Step 1.5: remove snmp6 entry */
2739 snmp6_unregister_dev(idev);
2740
2741 }
2742
2743 /* Step 2: clear hash table */
2744 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
2745 struct hlist_head *h = &inet6_addr_lst[i];
2746 struct hlist_node *n;
2747
2748 spin_lock_bh(&addrconf_hash_lock);
2749 restart:
2750 hlist_for_each_entry_rcu(ifa, n, h, addr_lst) {
2751 if (ifa->idev == idev) {
2752 hlist_del_init_rcu(&ifa->addr_lst);
2753 addrconf_del_timer(ifa);
2754 goto restart;
2755 }
2756 }
2757 spin_unlock_bh(&addrconf_hash_lock);
2758 }
2759
2760 write_lock_bh(&idev->lock);
2761
2762 /* Step 2: clear flags for stateless addrconf */
2763 if (!how)
2764 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2765
2766 #ifdef CONFIG_IPV6_PRIVACY
2767 if (how && del_timer(&idev->regen_timer))
2768 in6_dev_put(idev);
2769
2770 /* Step 3: clear tempaddr list */
2771 while (!list_empty(&idev->tempaddr_list)) {
2772 ifa = list_first_entry(&idev->tempaddr_list,
2773 struct inet6_ifaddr, tmp_list);
2774 list_del(&ifa->tmp_list);
2775 write_unlock_bh(&idev->lock);
2776 spin_lock_bh(&ifa->lock);
2777
2778 if (ifa->ifpub) {
2779 in6_ifa_put(ifa->ifpub);
2780 ifa->ifpub = NULL;
2781 }
2782 spin_unlock_bh(&ifa->lock);
2783 in6_ifa_put(ifa);
2784 write_lock_bh(&idev->lock);
2785 }
2786 #endif
2787
2788 while (!list_empty(&idev->addr_list)) {
2789 ifa = list_first_entry(&idev->addr_list,
2790 struct inet6_ifaddr, if_list);
2791 addrconf_del_timer(ifa);
2792
2793 list_del(&ifa->if_list);
2794
2795 write_unlock_bh(&idev->lock);
2796
2797 spin_lock_bh(&ifa->state_lock);
2798 state = ifa->state;
2799 ifa->state = INET6_IFADDR_STATE_DEAD;
2800 spin_unlock_bh(&ifa->state_lock);
2801
2802 if (state != INET6_IFADDR_STATE_DEAD) {
2803 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2804 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2805 }
2806 in6_ifa_put(ifa);
2807
2808 write_lock_bh(&idev->lock);
2809 }
2810
2811 write_unlock_bh(&idev->lock);
2812
2813 /* Step 5: Discard multicast list */
2814 if (how)
2815 ipv6_mc_destroy_dev(idev);
2816 else
2817 ipv6_mc_down(idev);
2818
2819 idev->tstamp = jiffies;
2820
2821 /* Last: Shot the device (if unregistered) */
2822 if (how) {
2823 addrconf_sysctl_unregister(idev);
2824 neigh_parms_release(&nd_tbl, idev->nd_parms);
2825 neigh_ifdown(&nd_tbl, dev);
2826 in6_dev_put(idev);
2827 }
2828 return 0;
2829 }
2830
2831 static void addrconf_rs_timer(unsigned long data)
2832 {
2833 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2834 struct inet6_dev *idev = ifp->idev;
2835
2836 read_lock(&idev->lock);
2837 if (idev->dead || !(idev->if_flags & IF_READY))
2838 goto out;
2839
2840 if (idev->cnf.forwarding)
2841 goto out;
2842
2843 /* Announcement received after solicitation was sent */
2844 if (idev->if_flags & IF_RA_RCVD)
2845 goto out;
2846
2847 spin_lock(&ifp->lock);
2848 if (ifp->probes++ < idev->cnf.rtr_solicits) {
2849 /* The wait after the last probe can be shorter */
2850 addrconf_mod_timer(ifp, AC_RS,
2851 (ifp->probes == idev->cnf.rtr_solicits) ?
2852 idev->cnf.rtr_solicit_delay :
2853 idev->cnf.rtr_solicit_interval);
2854 spin_unlock(&ifp->lock);
2855
2856 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2857 } else {
2858 spin_unlock(&ifp->lock);
2859 /*
2860 * Note: we do not support deprecated "all on-link"
2861 * assumption any longer.
2862 */
2863 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2864 idev->dev->name);
2865 }
2866
2867 out:
2868 read_unlock(&idev->lock);
2869 in6_ifa_put(ifp);
2870 }
2871
2872 /*
2873 * Duplicate Address Detection
2874 */
2875 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2876 {
2877 unsigned long rand_num;
2878 struct inet6_dev *idev = ifp->idev;
2879
2880 if (ifp->flags & IFA_F_OPTIMISTIC)
2881 rand_num = 0;
2882 else
2883 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2884
2885 ifp->probes = idev->cnf.dad_transmits;
2886 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2887 }
2888
2889 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2890 {
2891 struct inet6_dev *idev = ifp->idev;
2892 struct net_device *dev = idev->dev;
2893
2894 addrconf_join_solict(dev, &ifp->addr);
2895
2896 net_srandom(ifp->addr.s6_addr32[3]);
2897
2898 read_lock_bh(&idev->lock);
2899 spin_lock(&ifp->lock);
2900 if (ifp->state == INET6_IFADDR_STATE_DEAD)
2901 goto out;
2902
2903 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2904 idev->cnf.accept_dad < 1 ||
2905 !(ifp->flags&IFA_F_TENTATIVE) ||
2906 ifp->flags & IFA_F_NODAD) {
2907 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
2908 spin_unlock(&ifp->lock);
2909 read_unlock_bh(&idev->lock);
2910
2911 addrconf_dad_completed(ifp);
2912 return;
2913 }
2914
2915 if (!(idev->if_flags & IF_READY)) {
2916 spin_unlock(&ifp->lock);
2917 read_unlock_bh(&idev->lock);
2918 /*
2919 * If the device is not ready:
2920 * - keep it tentative if it is a permanent address.
2921 * - otherwise, kill it.
2922 */
2923 in6_ifa_hold(ifp);
2924 addrconf_dad_stop(ifp, 0);
2925 return;
2926 }
2927
2928 /*
2929 * Optimistic nodes can start receiving
2930 * Frames right away
2931 */
2932 if (ifp->flags & IFA_F_OPTIMISTIC)
2933 ip6_ins_rt(ifp->rt);
2934
2935 addrconf_dad_kick(ifp);
2936 out:
2937 spin_unlock(&ifp->lock);
2938 read_unlock_bh(&idev->lock);
2939 }
2940
2941 static void addrconf_dad_timer(unsigned long data)
2942 {
2943 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2944 struct inet6_dev *idev = ifp->idev;
2945 struct in6_addr mcaddr;
2946
2947 if (!ifp->probes && addrconf_dad_end(ifp))
2948 goto out;
2949
2950 read_lock(&idev->lock);
2951 if (idev->dead || !(idev->if_flags & IF_READY)) {
2952 read_unlock(&idev->lock);
2953 goto out;
2954 }
2955
2956 spin_lock(&ifp->lock);
2957 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
2958 spin_unlock(&ifp->lock);
2959 read_unlock(&idev->lock);
2960 goto out;
2961 }
2962
2963 if (ifp->probes == 0) {
2964 /*
2965 * DAD was successful
2966 */
2967
2968 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
2969 spin_unlock(&ifp->lock);
2970 read_unlock(&idev->lock);
2971
2972 addrconf_dad_completed(ifp);
2973
2974 goto out;
2975 }
2976
2977 ifp->probes--;
2978 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2979 spin_unlock(&ifp->lock);
2980 read_unlock(&idev->lock);
2981
2982 /* send a neighbour solicitation for our addr */
2983 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2984 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
2985 out:
2986 in6_ifa_put(ifp);
2987 }
2988
2989 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2990 {
2991 struct net_device *dev = ifp->idev->dev;
2992
2993 /*
2994 * Configure the address for reception. Now it is valid.
2995 */
2996
2997 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2998
2999 /* If added prefix is link local and forwarding is off,
3000 start sending router solicitations.
3001 */
3002
3003 if ((ifp->idev->cnf.forwarding == 0 ||
3004 ifp->idev->cnf.forwarding == 2) &&
3005 ifp->idev->cnf.rtr_solicits > 0 &&
3006 (dev->flags&IFF_LOOPBACK) == 0 &&
3007 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
3008 /*
3009 * If a host as already performed a random delay
3010 * [...] as part of DAD [...] there is no need
3011 * to delay again before sending the first RS
3012 */
3013 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
3014
3015 spin_lock_bh(&ifp->lock);
3016 ifp->probes = 1;
3017 ifp->idev->if_flags |= IF_RS_SENT;
3018 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
3019 spin_unlock_bh(&ifp->lock);
3020 }
3021 }
3022
3023 static void addrconf_dad_run(struct inet6_dev *idev)
3024 {
3025 struct inet6_ifaddr *ifp;
3026
3027 read_lock_bh(&idev->lock);
3028 list_for_each_entry(ifp, &idev->addr_list, if_list) {
3029 spin_lock(&ifp->lock);
3030 if (ifp->flags & IFA_F_TENTATIVE &&
3031 ifp->state == INET6_IFADDR_STATE_DAD)
3032 addrconf_dad_kick(ifp);
3033 spin_unlock(&ifp->lock);
3034 }
3035 read_unlock_bh(&idev->lock);
3036 }
3037
3038 #ifdef CONFIG_PROC_FS
3039 struct if6_iter_state {
3040 struct seq_net_private p;
3041 int bucket;
3042 };
3043
3044 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
3045 {
3046 struct inet6_ifaddr *ifa = NULL;
3047 struct if6_iter_state *state = seq->private;
3048 struct net *net = seq_file_net(seq);
3049
3050 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3051 struct hlist_node *n;
3052 hlist_for_each_entry_rcu_bh(ifa, n, &inet6_addr_lst[state->bucket],
3053 addr_lst)
3054 if (net_eq(dev_net(ifa->idev->dev), net))
3055 return ifa;
3056 }
3057 return NULL;
3058 }
3059
3060 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3061 struct inet6_ifaddr *ifa)
3062 {
3063 struct if6_iter_state *state = seq->private;
3064 struct net *net = seq_file_net(seq);
3065 struct hlist_node *n = &ifa->addr_lst;
3066
3067 hlist_for_each_entry_continue_rcu_bh(ifa, n, addr_lst)
3068 if (net_eq(dev_net(ifa->idev->dev), net))
3069 return ifa;
3070
3071 while (++state->bucket < IN6_ADDR_HSIZE) {
3072 hlist_for_each_entry_rcu_bh(ifa, n,
3073 &inet6_addr_lst[state->bucket], addr_lst) {
3074 if (net_eq(dev_net(ifa->idev->dev), net))
3075 return ifa;
3076 }
3077 }
3078
3079 return NULL;
3080 }
3081
3082 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
3083 {
3084 struct inet6_ifaddr *ifa = if6_get_first(seq);
3085
3086 if (ifa)
3087 while (pos && (ifa = if6_get_next(seq, ifa)) != NULL)
3088 --pos;
3089 return pos ? NULL : ifa;
3090 }
3091
3092 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3093 __acquires(rcu_bh)
3094 {
3095 rcu_read_lock_bh();
3096 return if6_get_idx(seq, *pos);
3097 }
3098
3099 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3100 {
3101 struct inet6_ifaddr *ifa;
3102
3103 ifa = if6_get_next(seq, v);
3104 ++*pos;
3105 return ifa;
3106 }
3107
3108 static void if6_seq_stop(struct seq_file *seq, void *v)
3109 __releases(rcu_bh)
3110 {
3111 rcu_read_unlock_bh();
3112 }
3113
3114 static int if6_seq_show(struct seq_file *seq, void *v)
3115 {
3116 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3117 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3118 &ifp->addr,
3119 ifp->idev->dev->ifindex,
3120 ifp->prefix_len,
3121 ifp->scope,
3122 ifp->flags,
3123 ifp->idev->dev->name);
3124 return 0;
3125 }
3126
3127 static const struct seq_operations if6_seq_ops = {
3128 .start = if6_seq_start,
3129 .next = if6_seq_next,
3130 .show = if6_seq_show,
3131 .stop = if6_seq_stop,
3132 };
3133
3134 static int if6_seq_open(struct inode *inode, struct file *file)
3135 {
3136 return seq_open_net(inode, file, &if6_seq_ops,
3137 sizeof(struct if6_iter_state));
3138 }
3139
3140 static const struct file_operations if6_fops = {
3141 .owner = THIS_MODULE,
3142 .open = if6_seq_open,
3143 .read = seq_read,
3144 .llseek = seq_lseek,
3145 .release = seq_release_net,
3146 };
3147
3148 static int __net_init if6_proc_net_init(struct net *net)
3149 {
3150 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
3151 return -ENOMEM;
3152 return 0;
3153 }
3154
3155 static void __net_exit if6_proc_net_exit(struct net *net)
3156 {
3157 proc_net_remove(net, "if_inet6");
3158 }
3159
3160 static struct pernet_operations if6_proc_net_ops = {
3161 .init = if6_proc_net_init,
3162 .exit = if6_proc_net_exit,
3163 };
3164
3165 int __init if6_proc_init(void)
3166 {
3167 return register_pernet_subsys(&if6_proc_net_ops);
3168 }
3169
3170 void if6_proc_exit(void)
3171 {
3172 unregister_pernet_subsys(&if6_proc_net_ops);
3173 }
3174 #endif /* CONFIG_PROC_FS */
3175
3176 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3177 /* Check if address is a home address configured on any interface. */
3178 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3179 {
3180 int ret = 0;
3181 struct inet6_ifaddr *ifp = NULL;
3182 struct hlist_node *n;
3183 unsigned int hash = ipv6_addr_hash(addr);
3184
3185 rcu_read_lock_bh();
3186 hlist_for_each_entry_rcu_bh(ifp, n, &inet6_addr_lst[hash], addr_lst) {
3187 if (!net_eq(dev_net(ifp->idev->dev), net))
3188 continue;
3189 if (ipv6_addr_equal(&ifp->addr, addr) &&
3190 (ifp->flags & IFA_F_HOMEADDRESS)) {
3191 ret = 1;
3192 break;
3193 }
3194 }
3195 rcu_read_unlock_bh();
3196 return ret;
3197 }
3198 #endif
3199
3200 /*
3201 * Periodic address status verification
3202 */
3203
3204 static void addrconf_verify(unsigned long foo)
3205 {
3206 unsigned long now, next, next_sec, next_sched;
3207 struct inet6_ifaddr *ifp;
3208 struct hlist_node *node;
3209 int i;
3210
3211 rcu_read_lock_bh();
3212 spin_lock(&addrconf_verify_lock);
3213 now = jiffies;
3214 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3215
3216 del_timer(&addr_chk_timer);
3217
3218 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3219 restart:
3220 hlist_for_each_entry_rcu_bh(ifp, node,
3221 &inet6_addr_lst[i], addr_lst) {
3222 unsigned long age;
3223
3224 if (ifp->flags & IFA_F_PERMANENT)
3225 continue;
3226
3227 spin_lock(&ifp->lock);
3228 /* We try to batch several events at once. */
3229 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3230
3231 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3232 age >= ifp->valid_lft) {
3233 spin_unlock(&ifp->lock);
3234 in6_ifa_hold(ifp);
3235 ipv6_del_addr(ifp);
3236 goto restart;
3237 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3238 spin_unlock(&ifp->lock);
3239 continue;
3240 } else if (age >= ifp->prefered_lft) {
3241 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3242 int deprecate = 0;
3243
3244 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3245 deprecate = 1;
3246 ifp->flags |= IFA_F_DEPRECATED;
3247 }
3248
3249 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3250 next = ifp->tstamp + ifp->valid_lft * HZ;
3251
3252 spin_unlock(&ifp->lock);
3253
3254 if (deprecate) {
3255 in6_ifa_hold(ifp);
3256
3257 ipv6_ifa_notify(0, ifp);
3258 in6_ifa_put(ifp);
3259 goto restart;
3260 }
3261 #ifdef CONFIG_IPV6_PRIVACY
3262 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3263 !(ifp->flags&IFA_F_TENTATIVE)) {
3264 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3265 ifp->idev->cnf.dad_transmits *
3266 ifp->idev->nd_parms->retrans_time / HZ;
3267
3268 if (age >= ifp->prefered_lft - regen_advance) {
3269 struct inet6_ifaddr *ifpub = ifp->ifpub;
3270 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3271 next = ifp->tstamp + ifp->prefered_lft * HZ;
3272 if (!ifp->regen_count && ifpub) {
3273 ifp->regen_count++;
3274 in6_ifa_hold(ifp);
3275 in6_ifa_hold(ifpub);
3276 spin_unlock(&ifp->lock);
3277
3278 spin_lock(&ifpub->lock);
3279 ifpub->regen_count = 0;
3280 spin_unlock(&ifpub->lock);
3281 ipv6_create_tempaddr(ifpub, ifp);
3282 in6_ifa_put(ifpub);
3283 in6_ifa_put(ifp);
3284 goto restart;
3285 }
3286 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3287 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3288 spin_unlock(&ifp->lock);
3289 #endif
3290 } else {
3291 /* ifp->prefered_lft <= ifp->valid_lft */
3292 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3293 next = ifp->tstamp + ifp->prefered_lft * HZ;
3294 spin_unlock(&ifp->lock);
3295 }
3296 }
3297 }
3298
3299 next_sec = round_jiffies_up(next);
3300 next_sched = next;
3301
3302 /* If rounded timeout is accurate enough, accept it. */
3303 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3304 next_sched = next_sec;
3305
3306 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3307 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3308 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3309
3310 ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3311 now, next, next_sec, next_sched));
3312
3313 addr_chk_timer.expires = next_sched;
3314 add_timer(&addr_chk_timer);
3315 spin_unlock(&addrconf_verify_lock);
3316 rcu_read_unlock_bh();
3317 }
3318
3319 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3320 {
3321 struct in6_addr *pfx = NULL;
3322
3323 if (addr)
3324 pfx = nla_data(addr);
3325
3326 if (local) {
3327 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3328 pfx = NULL;
3329 else
3330 pfx = nla_data(local);
3331 }
3332
3333 return pfx;
3334 }
3335
3336 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3337 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3338 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3339 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3340 };
3341
3342 static int
3343 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3344 {
3345 struct net *net = sock_net(skb->sk);
3346 struct ifaddrmsg *ifm;
3347 struct nlattr *tb[IFA_MAX+1];
3348 struct in6_addr *pfx;
3349 int err;
3350
3351 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3352 if (err < 0)
3353 return err;
3354
3355 ifm = nlmsg_data(nlh);
3356 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3357 if (pfx == NULL)
3358 return -EINVAL;
3359
3360 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3361 }
3362
3363 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3364 u32 prefered_lft, u32 valid_lft)
3365 {
3366 u32 flags;
3367 clock_t expires;
3368 unsigned long timeout;
3369
3370 if (!valid_lft || (prefered_lft > valid_lft))
3371 return -EINVAL;
3372
3373 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3374 if (addrconf_finite_timeout(timeout)) {
3375 expires = jiffies_to_clock_t(timeout * HZ);
3376 valid_lft = timeout;
3377 flags = RTF_EXPIRES;
3378 } else {
3379 expires = 0;
3380 flags = 0;
3381 ifa_flags |= IFA_F_PERMANENT;
3382 }
3383
3384 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3385 if (addrconf_finite_timeout(timeout)) {
3386 if (timeout == 0)
3387 ifa_flags |= IFA_F_DEPRECATED;
3388 prefered_lft = timeout;
3389 }
3390
3391 spin_lock_bh(&ifp->lock);
3392 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3393 ifp->tstamp = jiffies;
3394 ifp->valid_lft = valid_lft;
3395 ifp->prefered_lft = prefered_lft;
3396
3397 spin_unlock_bh(&ifp->lock);
3398 if (!(ifp->flags&IFA_F_TENTATIVE))
3399 ipv6_ifa_notify(0, ifp);
3400
3401 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3402 expires, flags);
3403 addrconf_verify(0);
3404
3405 return 0;
3406 }
3407
3408 static int
3409 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3410 {
3411 struct net *net = sock_net(skb->sk);
3412 struct ifaddrmsg *ifm;
3413 struct nlattr *tb[IFA_MAX+1];
3414 struct in6_addr *pfx;
3415 struct inet6_ifaddr *ifa;
3416 struct net_device *dev;
3417 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3418 u8 ifa_flags;
3419 int err;
3420
3421 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3422 if (err < 0)
3423 return err;
3424
3425 ifm = nlmsg_data(nlh);
3426 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3427 if (pfx == NULL)
3428 return -EINVAL;
3429
3430 if (tb[IFA_CACHEINFO]) {
3431 struct ifa_cacheinfo *ci;
3432
3433 ci = nla_data(tb[IFA_CACHEINFO]);
3434 valid_lft = ci->ifa_valid;
3435 preferred_lft = ci->ifa_prefered;
3436 } else {
3437 preferred_lft = INFINITY_LIFE_TIME;
3438 valid_lft = INFINITY_LIFE_TIME;
3439 }
3440
3441 dev = __dev_get_by_index(net, ifm->ifa_index);
3442 if (dev == NULL)
3443 return -ENODEV;
3444
3445 /* We ignore other flags so far. */
3446 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3447
3448 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3449 if (ifa == NULL) {
3450 /*
3451 * It would be best to check for !NLM_F_CREATE here but
3452 * userspace alreay relies on not having to provide this.
3453 */
3454 return inet6_addr_add(net, ifm->ifa_index, pfx,
3455 ifm->ifa_prefixlen, ifa_flags,
3456 preferred_lft, valid_lft);
3457 }
3458
3459 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3460 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3461 err = -EEXIST;
3462 else
3463 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3464
3465 in6_ifa_put(ifa);
3466
3467 return err;
3468 }
3469
3470 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3471 u8 scope, int ifindex)
3472 {
3473 struct ifaddrmsg *ifm;
3474
3475 ifm = nlmsg_data(nlh);
3476 ifm->ifa_family = AF_INET6;
3477 ifm->ifa_prefixlen = prefixlen;
3478 ifm->ifa_flags = flags;
3479 ifm->ifa_scope = scope;
3480 ifm->ifa_index = ifindex;
3481 }
3482
3483 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3484 unsigned long tstamp, u32 preferred, u32 valid)
3485 {
3486 struct ifa_cacheinfo ci;
3487
3488 ci.cstamp = cstamp_delta(cstamp);
3489 ci.tstamp = cstamp_delta(tstamp);
3490 ci.ifa_prefered = preferred;
3491 ci.ifa_valid = valid;
3492
3493 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3494 }
3495
3496 static inline int rt_scope(int ifa_scope)
3497 {
3498 if (ifa_scope & IFA_HOST)
3499 return RT_SCOPE_HOST;
3500 else if (ifa_scope & IFA_LINK)
3501 return RT_SCOPE_LINK;
3502 else if (ifa_scope & IFA_SITE)
3503 return RT_SCOPE_SITE;
3504 else
3505 return RT_SCOPE_UNIVERSE;
3506 }
3507
3508 static inline int inet6_ifaddr_msgsize(void)
3509 {
3510 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3511 + nla_total_size(16) /* IFA_ADDRESS */
3512 + nla_total_size(sizeof(struct ifa_cacheinfo));
3513 }
3514
3515 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3516 u32 pid, u32 seq, int event, unsigned int flags)
3517 {
3518 struct nlmsghdr *nlh;
3519 u32 preferred, valid;
3520
3521 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3522 if (nlh == NULL)
3523 return -EMSGSIZE;
3524
3525 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3526 ifa->idev->dev->ifindex);
3527
3528 if (!(ifa->flags&IFA_F_PERMANENT)) {
3529 preferred = ifa->prefered_lft;
3530 valid = ifa->valid_lft;
3531 if (preferred != INFINITY_LIFE_TIME) {
3532 long tval = (jiffies - ifa->tstamp)/HZ;
3533 if (preferred > tval)
3534 preferred -= tval;
3535 else
3536 preferred = 0;
3537 if (valid != INFINITY_LIFE_TIME) {
3538 if (valid > tval)
3539 valid -= tval;
3540 else
3541 valid = 0;
3542 }
3543 }
3544 } else {
3545 preferred = INFINITY_LIFE_TIME;
3546 valid = INFINITY_LIFE_TIME;
3547 }
3548
3549 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3550 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3551 nlmsg_cancel(skb, nlh);
3552 return -EMSGSIZE;
3553 }
3554
3555 return nlmsg_end(skb, nlh);
3556 }
3557
3558 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3559 u32 pid, u32 seq, int event, u16 flags)
3560 {
3561 struct nlmsghdr *nlh;
3562 u8 scope = RT_SCOPE_UNIVERSE;
3563 int ifindex = ifmca->idev->dev->ifindex;
3564
3565 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3566 scope = RT_SCOPE_SITE;
3567
3568 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3569 if (nlh == NULL)
3570 return -EMSGSIZE;
3571
3572 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3573 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3574 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3575 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3576 nlmsg_cancel(skb, nlh);
3577 return -EMSGSIZE;
3578 }
3579
3580 return nlmsg_end(skb, nlh);
3581 }
3582
3583 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3584 u32 pid, u32 seq, int event, unsigned int flags)
3585 {
3586 struct nlmsghdr *nlh;
3587 u8 scope = RT_SCOPE_UNIVERSE;
3588 int ifindex = ifaca->aca_idev->dev->ifindex;
3589
3590 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3591 scope = RT_SCOPE_SITE;
3592
3593 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3594 if (nlh == NULL)
3595 return -EMSGSIZE;
3596
3597 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3598 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3599 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3600 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3601 nlmsg_cancel(skb, nlh);
3602 return -EMSGSIZE;
3603 }
3604
3605 return nlmsg_end(skb, nlh);
3606 }
3607
3608 enum addr_type_t {
3609 UNICAST_ADDR,
3610 MULTICAST_ADDR,
3611 ANYCAST_ADDR,
3612 };
3613
3614 /* called with rcu_read_lock() */
3615 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3616 struct netlink_callback *cb, enum addr_type_t type,
3617 int s_ip_idx, int *p_ip_idx)
3618 {
3619 struct ifmcaddr6 *ifmca;
3620 struct ifacaddr6 *ifaca;
3621 int err = 1;
3622 int ip_idx = *p_ip_idx;
3623
3624 read_lock_bh(&idev->lock);
3625 switch (type) {
3626 case UNICAST_ADDR: {
3627 struct inet6_ifaddr *ifa;
3628
3629 /* unicast address incl. temp addr */
3630 list_for_each_entry(ifa, &idev->addr_list, if_list) {
3631 if (++ip_idx < s_ip_idx)
3632 continue;
3633 err = inet6_fill_ifaddr(skb, ifa,
3634 NETLINK_CB(cb->skb).pid,
3635 cb->nlh->nlmsg_seq,
3636 RTM_NEWADDR,
3637 NLM_F_MULTI);
3638 if (err <= 0)
3639 break;
3640 }
3641 break;
3642 }
3643 case MULTICAST_ADDR:
3644 /* multicast address */
3645 for (ifmca = idev->mc_list; ifmca;
3646 ifmca = ifmca->next, ip_idx++) {
3647 if (ip_idx < s_ip_idx)
3648 continue;
3649 err = inet6_fill_ifmcaddr(skb, ifmca,
3650 NETLINK_CB(cb->skb).pid,
3651 cb->nlh->nlmsg_seq,
3652 RTM_GETMULTICAST,
3653 NLM_F_MULTI);
3654 if (err <= 0)
3655 break;
3656 }
3657 break;
3658 case ANYCAST_ADDR:
3659 /* anycast address */
3660 for (ifaca = idev->ac_list; ifaca;
3661 ifaca = ifaca->aca_next, ip_idx++) {
3662 if (ip_idx < s_ip_idx)
3663 continue;
3664 err = inet6_fill_ifacaddr(skb, ifaca,
3665 NETLINK_CB(cb->skb).pid,
3666 cb->nlh->nlmsg_seq,
3667 RTM_GETANYCAST,
3668 NLM_F_MULTI);
3669 if (err <= 0)
3670 break;
3671 }
3672 break;
3673 default:
3674 break;
3675 }
3676 read_unlock_bh(&idev->lock);
3677 *p_ip_idx = ip_idx;
3678 return err;
3679 }
3680
3681 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3682 enum addr_type_t type)
3683 {
3684 struct net *net = sock_net(skb->sk);
3685 int h, s_h;
3686 int idx, ip_idx;
3687 int s_idx, s_ip_idx;
3688 struct net_device *dev;
3689 struct inet6_dev *idev;
3690 struct hlist_head *head;
3691 struct hlist_node *node;
3692
3693 s_h = cb->args[0];
3694 s_idx = idx = cb->args[1];
3695 s_ip_idx = ip_idx = cb->args[2];
3696
3697 rcu_read_lock();
3698 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3699 idx = 0;
3700 head = &net->dev_index_head[h];
3701 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3702 if (idx < s_idx)
3703 goto cont;
3704 if (h > s_h || idx > s_idx)
3705 s_ip_idx = 0;
3706 ip_idx = 0;
3707 idev = __in6_dev_get(dev);
3708 if (!idev)
3709 goto cont;
3710
3711 if (in6_dump_addrs(idev, skb, cb, type,
3712 s_ip_idx, &ip_idx) <= 0)
3713 goto done;
3714 cont:
3715 idx++;
3716 }
3717 }
3718 done:
3719 rcu_read_unlock();
3720 cb->args[0] = h;
3721 cb->args[1] = idx;
3722 cb->args[2] = ip_idx;
3723
3724 return skb->len;
3725 }
3726
3727 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3728 {
3729 enum addr_type_t type = UNICAST_ADDR;
3730
3731 return inet6_dump_addr(skb, cb, type);
3732 }
3733
3734 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3735 {
3736 enum addr_type_t type = MULTICAST_ADDR;
3737
3738 return inet6_dump_addr(skb, cb, type);
3739 }
3740
3741
3742 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3743 {
3744 enum addr_type_t type = ANYCAST_ADDR;
3745
3746 return inet6_dump_addr(skb, cb, type);
3747 }
3748
3749 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3750 void *arg)
3751 {
3752 struct net *net = sock_net(in_skb->sk);
3753 struct ifaddrmsg *ifm;
3754 struct nlattr *tb[IFA_MAX+1];
3755 struct in6_addr *addr = NULL;
3756 struct net_device *dev = NULL;
3757 struct inet6_ifaddr *ifa;
3758 struct sk_buff *skb;
3759 int err;
3760
3761 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3762 if (err < 0)
3763 goto errout;
3764
3765 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3766 if (addr == NULL) {
3767 err = -EINVAL;
3768 goto errout;
3769 }
3770
3771 ifm = nlmsg_data(nlh);
3772 if (ifm->ifa_index)
3773 dev = __dev_get_by_index(net, ifm->ifa_index);
3774
3775 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
3776 if (!ifa) {
3777 err = -EADDRNOTAVAIL;
3778 goto errout;
3779 }
3780
3781 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
3782 if (!skb) {
3783 err = -ENOBUFS;
3784 goto errout_ifa;
3785 }
3786
3787 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3788 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3789 if (err < 0) {
3790 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3791 WARN_ON(err == -EMSGSIZE);
3792 kfree_skb(skb);
3793 goto errout_ifa;
3794 }
3795 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
3796 errout_ifa:
3797 in6_ifa_put(ifa);
3798 errout:
3799 return err;
3800 }
3801
3802 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3803 {
3804 struct sk_buff *skb;
3805 struct net *net = dev_net(ifa->idev->dev);
3806 int err = -ENOBUFS;
3807
3808 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3809 if (skb == NULL)
3810 goto errout;
3811
3812 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3813 if (err < 0) {
3814 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3815 WARN_ON(err == -EMSGSIZE);
3816 kfree_skb(skb);
3817 goto errout;
3818 }
3819 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3820 return;
3821 errout:
3822 if (err < 0)
3823 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3824 }
3825
3826 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3827 __s32 *array, int bytes)
3828 {
3829 BUG_ON(bytes < (DEVCONF_MAX * 4));
3830
3831 memset(array, 0, bytes);
3832 array[DEVCONF_FORWARDING] = cnf->forwarding;
3833 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3834 array[DEVCONF_MTU6] = cnf->mtu6;
3835 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3836 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3837 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3838 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3839 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3840 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
3841 jiffies_to_msecs(cnf->rtr_solicit_interval);
3842 array[DEVCONF_RTR_SOLICIT_DELAY] =
3843 jiffies_to_msecs(cnf->rtr_solicit_delay);
3844 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3845 #ifdef CONFIG_IPV6_PRIVACY
3846 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3847 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3848 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3849 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3850 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3851 #endif
3852 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3853 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3854 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3855 #ifdef CONFIG_IPV6_ROUTER_PREF
3856 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3857 array[DEVCONF_RTR_PROBE_INTERVAL] =
3858 jiffies_to_msecs(cnf->rtr_probe_interval);
3859 #ifdef CONFIG_IPV6_ROUTE_INFO
3860 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3861 #endif
3862 #endif
3863 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3864 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3865 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3866 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3867 #endif
3868 #ifdef CONFIG_IPV6_MROUTE
3869 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
3870 #endif
3871 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
3872 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
3873 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
3874 }
3875
3876 static inline size_t inet6_ifla6_size(void)
3877 {
3878 return nla_total_size(4) /* IFLA_INET6_FLAGS */
3879 + nla_total_size(sizeof(struct ifla_cacheinfo))
3880 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3881 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3882 + nla_total_size(ICMP6_MIB_MAX * 8); /* IFLA_INET6_ICMP6STATS */
3883 }
3884
3885 static inline size_t inet6_if_nlmsg_size(void)
3886 {
3887 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3888 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3889 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3890 + nla_total_size(4) /* IFLA_MTU */
3891 + nla_total_size(4) /* IFLA_LINK */
3892 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
3893 }
3894
3895 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
3896 int items, int bytes)
3897 {
3898 int i;
3899 int pad = bytes - sizeof(u64) * items;
3900 BUG_ON(pad < 0);
3901
3902 /* Use put_unaligned() because stats may not be aligned for u64. */
3903 put_unaligned(items, &stats[0]);
3904 for (i = 1; i < items; i++)
3905 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
3906
3907 memset(&stats[items], 0, pad);
3908 }
3909
3910 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib,
3911 int items, int bytes, size_t syncpoff)
3912 {
3913 int i;
3914 int pad = bytes - sizeof(u64) * items;
3915 BUG_ON(pad < 0);
3916
3917 /* Use put_unaligned() because stats may not be aligned for u64. */
3918 put_unaligned(items, &stats[0]);
3919 for (i = 1; i < items; i++)
3920 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
3921
3922 memset(&stats[items], 0, pad);
3923 }
3924
3925 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3926 int bytes)
3927 {
3928 switch (attrtype) {
3929 case IFLA_INET6_STATS:
3930 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6,
3931 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
3932 break;
3933 case IFLA_INET6_ICMP6STATS:
3934 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
3935 break;
3936 }
3937 }
3938
3939 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
3940 {
3941 struct nlattr *nla;
3942 struct ifla_cacheinfo ci;
3943
3944 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
3945
3946 ci.max_reasm_len = IPV6_MAXPLEN;
3947 ci.tstamp = cstamp_delta(idev->tstamp);
3948 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
3949 ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time);
3950 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3951
3952 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3953 if (nla == NULL)
3954 goto nla_put_failure;
3955 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
3956
3957 /* XXX - MC not implemented */
3958
3959 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3960 if (nla == NULL)
3961 goto nla_put_failure;
3962 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3963
3964 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3965 if (nla == NULL)
3966 goto nla_put_failure;
3967 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
3968
3969 return 0;
3970
3971 nla_put_failure:
3972 return -EMSGSIZE;
3973 }
3974
3975 static size_t inet6_get_link_af_size(const struct net_device *dev)
3976 {
3977 if (!__in6_dev_get(dev))
3978 return 0;
3979
3980 return inet6_ifla6_size();
3981 }
3982
3983 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
3984 {
3985 struct inet6_dev *idev = __in6_dev_get(dev);
3986
3987 if (!idev)
3988 return -ENODATA;
3989
3990 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
3991 return -EMSGSIZE;
3992
3993 return 0;
3994 }
3995
3996 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3997 u32 pid, u32 seq, int event, unsigned int flags)
3998 {
3999 struct net_device *dev = idev->dev;
4000 struct ifinfomsg *hdr;
4001 struct nlmsghdr *nlh;
4002 void *protoinfo;
4003
4004 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
4005 if (nlh == NULL)
4006 return -EMSGSIZE;
4007
4008 hdr = nlmsg_data(nlh);
4009 hdr->ifi_family = AF_INET6;
4010 hdr->__ifi_pad = 0;
4011 hdr->ifi_type = dev->type;
4012 hdr->ifi_index = dev->ifindex;
4013 hdr->ifi_flags = dev_get_flags(dev);
4014 hdr->ifi_change = 0;
4015
4016 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
4017
4018 if (dev->addr_len)
4019 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
4020
4021 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
4022 if (dev->ifindex != dev->iflink)
4023 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
4024
4025 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4026 if (protoinfo == NULL)
4027 goto nla_put_failure;
4028
4029 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4030 goto nla_put_failure;
4031
4032 nla_nest_end(skb, protoinfo);
4033 return nlmsg_end(skb, nlh);
4034
4035 nla_put_failure:
4036 nlmsg_cancel(skb, nlh);
4037 return -EMSGSIZE;
4038 }
4039
4040 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4041 {
4042 struct net *net = sock_net(skb->sk);
4043 int h, s_h;
4044 int idx = 0, s_idx;
4045 struct net_device *dev;
4046 struct inet6_dev *idev;
4047 struct hlist_head *head;
4048 struct hlist_node *node;
4049
4050 s_h = cb->args[0];
4051 s_idx = cb->args[1];
4052
4053 rcu_read_lock();
4054 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4055 idx = 0;
4056 head = &net->dev_index_head[h];
4057 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
4058 if (idx < s_idx)
4059 goto cont;
4060 idev = __in6_dev_get(dev);
4061 if (!idev)
4062 goto cont;
4063 if (inet6_fill_ifinfo(skb, idev,
4064 NETLINK_CB(cb->skb).pid,
4065 cb->nlh->nlmsg_seq,
4066 RTM_NEWLINK, NLM_F_MULTI) <= 0)
4067 goto out;
4068 cont:
4069 idx++;
4070 }
4071 }
4072 out:
4073 rcu_read_unlock();
4074 cb->args[1] = idx;
4075 cb->args[0] = h;
4076
4077 return skb->len;
4078 }
4079
4080 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4081 {
4082 struct sk_buff *skb;
4083 struct net *net = dev_net(idev->dev);
4084 int err = -ENOBUFS;
4085
4086 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
4087 if (skb == NULL)
4088 goto errout;
4089
4090 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
4091 if (err < 0) {
4092 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4093 WARN_ON(err == -EMSGSIZE);
4094 kfree_skb(skb);
4095 goto errout;
4096 }
4097 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
4098 return;
4099 errout:
4100 if (err < 0)
4101 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
4102 }
4103
4104 static inline size_t inet6_prefix_nlmsg_size(void)
4105 {
4106 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4107 + nla_total_size(sizeof(struct in6_addr))
4108 + nla_total_size(sizeof(struct prefix_cacheinfo));
4109 }
4110
4111 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
4112 struct prefix_info *pinfo, u32 pid, u32 seq,
4113 int event, unsigned int flags)
4114 {
4115 struct prefixmsg *pmsg;
4116 struct nlmsghdr *nlh;
4117 struct prefix_cacheinfo ci;
4118
4119 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
4120 if (nlh == NULL)
4121 return -EMSGSIZE;
4122
4123 pmsg = nlmsg_data(nlh);
4124 pmsg->prefix_family = AF_INET6;
4125 pmsg->prefix_pad1 = 0;
4126 pmsg->prefix_pad2 = 0;
4127 pmsg->prefix_ifindex = idev->dev->ifindex;
4128 pmsg->prefix_len = pinfo->prefix_len;
4129 pmsg->prefix_type = pinfo->type;
4130 pmsg->prefix_pad3 = 0;
4131 pmsg->prefix_flags = 0;
4132 if (pinfo->onlink)
4133 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4134 if (pinfo->autoconf)
4135 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4136
4137 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
4138
4139 ci.preferred_time = ntohl(pinfo->prefered);
4140 ci.valid_time = ntohl(pinfo->valid);
4141 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
4142
4143 return nlmsg_end(skb, nlh);
4144
4145 nla_put_failure:
4146 nlmsg_cancel(skb, nlh);
4147 return -EMSGSIZE;
4148 }
4149
4150 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
4151 struct prefix_info *pinfo)
4152 {
4153 struct sk_buff *skb;
4154 struct net *net = dev_net(idev->dev);
4155 int err = -ENOBUFS;
4156
4157 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
4158 if (skb == NULL)
4159 goto errout;
4160
4161 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
4162 if (err < 0) {
4163 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4164 WARN_ON(err == -EMSGSIZE);
4165 kfree_skb(skb);
4166 goto errout;
4167 }
4168 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4169 return;
4170 errout:
4171 if (err < 0)
4172 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
4173 }
4174
4175 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4176 {
4177 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4178
4179 switch (event) {
4180 case RTM_NEWADDR:
4181 /*
4182 * If the address was optimistic
4183 * we inserted the route at the start of
4184 * our DAD process, so we don't need
4185 * to do it again
4186 */
4187 if (!(ifp->rt->rt6i_node))
4188 ip6_ins_rt(ifp->rt);
4189 if (ifp->idev->cnf.forwarding)
4190 addrconf_join_anycast(ifp);
4191 break;
4192 case RTM_DELADDR:
4193 if (ifp->idev->cnf.forwarding)
4194 addrconf_leave_anycast(ifp);
4195 addrconf_leave_solict(ifp->idev, &ifp->addr);
4196 dst_hold(&ifp->rt->dst);
4197
4198 if (ip6_del_rt(ifp->rt))
4199 dst_free(&ifp->rt->dst);
4200 break;
4201 }
4202 }
4203
4204 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4205 {
4206 rcu_read_lock_bh();
4207 if (likely(ifp->idev->dead == 0))
4208 __ipv6_ifa_notify(event, ifp);
4209 rcu_read_unlock_bh();
4210 }
4211
4212 #ifdef CONFIG_SYSCTL
4213
4214 static
4215 int addrconf_sysctl_forward(ctl_table *ctl, int write,
4216 void __user *buffer, size_t *lenp, loff_t *ppos)
4217 {
4218 int *valp = ctl->data;
4219 int val = *valp;
4220 loff_t pos = *ppos;
4221 int ret;
4222
4223 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
4224
4225 if (write)
4226 ret = addrconf_fixup_forwarding(ctl, valp, val);
4227 if (ret)
4228 *ppos = pos;
4229 return ret;
4230 }
4231
4232 static void dev_disable_change(struct inet6_dev *idev)
4233 {
4234 if (!idev || !idev->dev)
4235 return;
4236
4237 if (idev->cnf.disable_ipv6)
4238 addrconf_notify(NULL, NETDEV_DOWN, idev->dev);
4239 else
4240 addrconf_notify(NULL, NETDEV_UP, idev->dev);
4241 }
4242
4243 static void addrconf_disable_change(struct net *net, __s32 newf)
4244 {
4245 struct net_device *dev;
4246 struct inet6_dev *idev;
4247
4248 rcu_read_lock();
4249 for_each_netdev_rcu(net, dev) {
4250 idev = __in6_dev_get(dev);
4251 if (idev) {
4252 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4253 idev->cnf.disable_ipv6 = newf;
4254 if (changed)
4255 dev_disable_change(idev);
4256 }
4257 }
4258 rcu_read_unlock();
4259 }
4260
4261 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int old)
4262 {
4263 struct net *net;
4264
4265 net = (struct net *)table->extra2;
4266
4267 if (p == &net->ipv6.devconf_dflt->disable_ipv6)
4268 return 0;
4269
4270 if (!rtnl_trylock()) {
4271 /* Restore the original values before restarting */
4272 *p = old;
4273 return restart_syscall();
4274 }
4275
4276 if (p == &net->ipv6.devconf_all->disable_ipv6) {
4277 __s32 newf = net->ipv6.devconf_all->disable_ipv6;
4278 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4279 addrconf_disable_change(net, newf);
4280 } else if ((!*p) ^ (!old))
4281 dev_disable_change((struct inet6_dev *)table->extra1);
4282
4283 rtnl_unlock();
4284 return 0;
4285 }
4286
4287 static
4288 int addrconf_sysctl_disable(ctl_table *ctl, int write,
4289 void __user *buffer, size_t *lenp, loff_t *ppos)
4290 {
4291 int *valp = ctl->data;
4292 int val = *valp;
4293 loff_t pos = *ppos;
4294 int ret;
4295
4296 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
4297
4298 if (write)
4299 ret = addrconf_disable_ipv6(ctl, valp, val);
4300 if (ret)
4301 *ppos = pos;
4302 return ret;
4303 }
4304
4305 static struct addrconf_sysctl_table
4306 {
4307 struct ctl_table_header *sysctl_header;
4308 ctl_table addrconf_vars[DEVCONF_MAX+1];
4309 char *dev_name;
4310 } addrconf_sysctl __read_mostly = {
4311 .sysctl_header = NULL,
4312 .addrconf_vars = {
4313 {
4314 .procname = "forwarding",
4315 .data = &ipv6_devconf.forwarding,
4316 .maxlen = sizeof(int),
4317 .mode = 0644,
4318 .proc_handler = addrconf_sysctl_forward,
4319 },
4320 {
4321 .procname = "hop_limit",
4322 .data = &ipv6_devconf.hop_limit,
4323 .maxlen = sizeof(int),
4324 .mode = 0644,
4325 .proc_handler = proc_dointvec,
4326 },
4327 {
4328 .procname = "mtu",
4329 .data = &ipv6_devconf.mtu6,
4330 .maxlen = sizeof(int),
4331 .mode = 0644,
4332 .proc_handler = proc_dointvec,
4333 },
4334 {
4335 .procname = "accept_ra",
4336 .data = &ipv6_devconf.accept_ra,
4337 .maxlen = sizeof(int),
4338 .mode = 0644,
4339 .proc_handler = proc_dointvec,
4340 },
4341 {
4342 .procname = "accept_redirects",
4343 .data = &ipv6_devconf.accept_redirects,
4344 .maxlen = sizeof(int),
4345 .mode = 0644,
4346 .proc_handler = proc_dointvec,
4347 },
4348 {
4349 .procname = "autoconf",
4350 .data = &ipv6_devconf.autoconf,
4351 .maxlen = sizeof(int),
4352 .mode = 0644,
4353 .proc_handler = proc_dointvec,
4354 },
4355 {
4356 .procname = "dad_transmits",
4357 .data = &ipv6_devconf.dad_transmits,
4358 .maxlen = sizeof(int),
4359 .mode = 0644,
4360 .proc_handler = proc_dointvec,
4361 },
4362 {
4363 .procname = "router_solicitations",
4364 .data = &ipv6_devconf.rtr_solicits,
4365 .maxlen = sizeof(int),
4366 .mode = 0644,
4367 .proc_handler = proc_dointvec,
4368 },
4369 {
4370 .procname = "router_solicitation_interval",
4371 .data = &ipv6_devconf.rtr_solicit_interval,
4372 .maxlen = sizeof(int),
4373 .mode = 0644,
4374 .proc_handler = proc_dointvec_jiffies,
4375 },
4376 {
4377 .procname = "router_solicitation_delay",
4378 .data = &ipv6_devconf.rtr_solicit_delay,
4379 .maxlen = sizeof(int),
4380 .mode = 0644,
4381 .proc_handler = proc_dointvec_jiffies,
4382 },
4383 {
4384 .procname = "force_mld_version",
4385 .data = &ipv6_devconf.force_mld_version,
4386 .maxlen = sizeof(int),
4387 .mode = 0644,
4388 .proc_handler = proc_dointvec,
4389 },
4390 #ifdef CONFIG_IPV6_PRIVACY
4391 {
4392 .procname = "use_tempaddr",
4393 .data = &ipv6_devconf.use_tempaddr,
4394 .maxlen = sizeof(int),
4395 .mode = 0644,
4396 .proc_handler = proc_dointvec,
4397 },
4398 {
4399 .procname = "temp_valid_lft",
4400 .data = &ipv6_devconf.temp_valid_lft,
4401 .maxlen = sizeof(int),
4402 .mode = 0644,
4403 .proc_handler = proc_dointvec,
4404 },
4405 {
4406 .procname = "temp_prefered_lft",
4407 .data = &ipv6_devconf.temp_prefered_lft,
4408 .maxlen = sizeof(int),
4409 .mode = 0644,
4410 .proc_handler = proc_dointvec,
4411 },
4412 {
4413 .procname = "regen_max_retry",
4414 .data = &ipv6_devconf.regen_max_retry,
4415 .maxlen = sizeof(int),
4416 .mode = 0644,
4417 .proc_handler = proc_dointvec,
4418 },
4419 {
4420 .procname = "max_desync_factor",
4421 .data = &ipv6_devconf.max_desync_factor,
4422 .maxlen = sizeof(int),
4423 .mode = 0644,
4424 .proc_handler = proc_dointvec,
4425 },
4426 #endif
4427 {
4428 .procname = "max_addresses",
4429 .data = &ipv6_devconf.max_addresses,
4430 .maxlen = sizeof(int),
4431 .mode = 0644,
4432 .proc_handler = proc_dointvec,
4433 },
4434 {
4435 .procname = "accept_ra_defrtr",
4436 .data = &ipv6_devconf.accept_ra_defrtr,
4437 .maxlen = sizeof(int),
4438 .mode = 0644,
4439 .proc_handler = proc_dointvec,
4440 },
4441 {
4442 .procname = "accept_ra_pinfo",
4443 .data = &ipv6_devconf.accept_ra_pinfo,
4444 .maxlen = sizeof(int),
4445 .mode = 0644,
4446 .proc_handler = proc_dointvec,
4447 },
4448 #ifdef CONFIG_IPV6_ROUTER_PREF
4449 {
4450 .procname = "accept_ra_rtr_pref",
4451 .data = &ipv6_devconf.accept_ra_rtr_pref,
4452 .maxlen = sizeof(int),
4453 .mode = 0644,
4454 .proc_handler = proc_dointvec,
4455 },
4456 {
4457 .procname = "router_probe_interval",
4458 .data = &ipv6_devconf.rtr_probe_interval,
4459 .maxlen = sizeof(int),
4460 .mode = 0644,
4461 .proc_handler = proc_dointvec_jiffies,
4462 },
4463 #ifdef CONFIG_IPV6_ROUTE_INFO
4464 {
4465 .procname = "accept_ra_rt_info_max_plen",
4466 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4467 .maxlen = sizeof(int),
4468 .mode = 0644,
4469 .proc_handler = proc_dointvec,
4470 },
4471 #endif
4472 #endif
4473 {
4474 .procname = "proxy_ndp",
4475 .data = &ipv6_devconf.proxy_ndp,
4476 .maxlen = sizeof(int),
4477 .mode = 0644,
4478 .proc_handler = proc_dointvec,
4479 },
4480 {
4481 .procname = "accept_source_route",
4482 .data = &ipv6_devconf.accept_source_route,
4483 .maxlen = sizeof(int),
4484 .mode = 0644,
4485 .proc_handler = proc_dointvec,
4486 },
4487 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4488 {
4489 .procname = "optimistic_dad",
4490 .data = &ipv6_devconf.optimistic_dad,
4491 .maxlen = sizeof(int),
4492 .mode = 0644,
4493 .proc_handler = proc_dointvec,
4494
4495 },
4496 #endif
4497 #ifdef CONFIG_IPV6_MROUTE
4498 {
4499 .procname = "mc_forwarding",
4500 .data = &ipv6_devconf.mc_forwarding,
4501 .maxlen = sizeof(int),
4502 .mode = 0444,
4503 .proc_handler = proc_dointvec,
4504 },
4505 #endif
4506 {
4507 .procname = "disable_ipv6",
4508 .data = &ipv6_devconf.disable_ipv6,
4509 .maxlen = sizeof(int),
4510 .mode = 0644,
4511 .proc_handler = addrconf_sysctl_disable,
4512 },
4513 {
4514 .procname = "accept_dad",
4515 .data = &ipv6_devconf.accept_dad,
4516 .maxlen = sizeof(int),
4517 .mode = 0644,
4518 .proc_handler = proc_dointvec,
4519 },
4520 {
4521 .procname = "force_tllao",
4522 .data = &ipv6_devconf.force_tllao,
4523 .maxlen = sizeof(int),
4524 .mode = 0644,
4525 .proc_handler = proc_dointvec
4526 },
4527 {
4528 /* sentinel */
4529 }
4530 },
4531 };
4532
4533 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4534 struct inet6_dev *idev, struct ipv6_devconf *p)
4535 {
4536 int i;
4537 struct addrconf_sysctl_table *t;
4538
4539 #define ADDRCONF_CTL_PATH_DEV 3
4540
4541 struct ctl_path addrconf_ctl_path[] = {
4542 { .procname = "net", },
4543 { .procname = "ipv6", },
4544 { .procname = "conf", },
4545 { /* to be set */ },
4546 { },
4547 };
4548
4549
4550 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4551 if (t == NULL)
4552 goto out;
4553
4554 for (i = 0; t->addrconf_vars[i].data; i++) {
4555 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
4556 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4557 t->addrconf_vars[i].extra2 = net;
4558 }
4559
4560 /*
4561 * Make a copy of dev_name, because '.procname' is regarded as const
4562 * by sysctl and we wouldn't want anyone to change it under our feet
4563 * (see SIOCSIFNAME).
4564 */
4565 t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4566 if (!t->dev_name)
4567 goto free;
4568
4569 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
4570
4571 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
4572 t->addrconf_vars);
4573 if (t->sysctl_header == NULL)
4574 goto free_procname;
4575
4576 p->sysctl = t;
4577 return 0;
4578
4579 free_procname:
4580 kfree(t->dev_name);
4581 free:
4582 kfree(t);
4583 out:
4584 return -ENOBUFS;
4585 }
4586
4587 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4588 {
4589 struct addrconf_sysctl_table *t;
4590
4591 if (p->sysctl == NULL)
4592 return;
4593
4594 t = p->sysctl;
4595 p->sysctl = NULL;
4596 unregister_net_sysctl_table(t->sysctl_header);
4597 kfree(t->dev_name);
4598 kfree(t);
4599 }
4600
4601 static void addrconf_sysctl_register(struct inet6_dev *idev)
4602 {
4603 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
4604 &ndisc_ifinfo_sysctl_change);
4605 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
4606 idev, &idev->cnf);
4607 }
4608
4609 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
4610 {
4611 __addrconf_sysctl_unregister(&idev->cnf);
4612 neigh_sysctl_unregister(idev->nd_parms);
4613 }
4614
4615
4616 #endif
4617
4618 static int __net_init addrconf_init_net(struct net *net)
4619 {
4620 int err;
4621 struct ipv6_devconf *all, *dflt;
4622
4623 err = -ENOMEM;
4624 all = &ipv6_devconf;
4625 dflt = &ipv6_devconf_dflt;
4626
4627 if (!net_eq(net, &init_net)) {
4628 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4629 if (all == NULL)
4630 goto err_alloc_all;
4631
4632 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4633 if (dflt == NULL)
4634 goto err_alloc_dflt;
4635 } else {
4636 /* these will be inherited by all namespaces */
4637 dflt->autoconf = ipv6_defaults.autoconf;
4638 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
4639 }
4640
4641 net->ipv6.devconf_all = all;
4642 net->ipv6.devconf_dflt = dflt;
4643
4644 #ifdef CONFIG_SYSCTL
4645 err = __addrconf_sysctl_register(net, "all", NULL, all);
4646 if (err < 0)
4647 goto err_reg_all;
4648
4649 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
4650 if (err < 0)
4651 goto err_reg_dflt;
4652 #endif
4653 return 0;
4654
4655 #ifdef CONFIG_SYSCTL
4656 err_reg_dflt:
4657 __addrconf_sysctl_unregister(all);
4658 err_reg_all:
4659 kfree(dflt);
4660 #endif
4661 err_alloc_dflt:
4662 kfree(all);
4663 err_alloc_all:
4664 return err;
4665 }
4666
4667 static void __net_exit addrconf_exit_net(struct net *net)
4668 {
4669 #ifdef CONFIG_SYSCTL
4670 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4671 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4672 #endif
4673 if (!net_eq(net, &init_net)) {
4674 kfree(net->ipv6.devconf_dflt);
4675 kfree(net->ipv6.devconf_all);
4676 }
4677 }
4678
4679 static struct pernet_operations addrconf_ops = {
4680 .init = addrconf_init_net,
4681 .exit = addrconf_exit_net,
4682 };
4683
4684 /*
4685 * Device notifier
4686 */
4687
4688 int register_inet6addr_notifier(struct notifier_block *nb)
4689 {
4690 return atomic_notifier_chain_register(&inet6addr_chain, nb);
4691 }
4692 EXPORT_SYMBOL(register_inet6addr_notifier);
4693
4694 int unregister_inet6addr_notifier(struct notifier_block *nb)
4695 {
4696 return atomic_notifier_chain_unregister(&inet6addr_chain, nb);
4697 }
4698 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4699
4700 static struct rtnl_af_ops inet6_ops = {
4701 .family = AF_INET6,
4702 .fill_link_af = inet6_fill_link_af,
4703 .get_link_af_size = inet6_get_link_af_size,
4704 };
4705
4706 /*
4707 * Init / cleanup code
4708 */
4709
4710 int __init addrconf_init(void)
4711 {
4712 int i, err;
4713
4714 err = ipv6_addr_label_init();
4715 if (err < 0) {
4716 printk(KERN_CRIT "IPv6 Addrconf:"
4717 " cannot initialize default policy table: %d.\n", err);
4718 goto out;
4719 }
4720
4721 err = register_pernet_subsys(&addrconf_ops);
4722 if (err < 0)
4723 goto out_addrlabel;
4724
4725 /* The addrconf netdev notifier requires that loopback_dev
4726 * has it's ipv6 private information allocated and setup
4727 * before it can bring up and give link-local addresses
4728 * to other devices which are up.
4729 *
4730 * Unfortunately, loopback_dev is not necessarily the first
4731 * entry in the global dev_base list of net devices. In fact,
4732 * it is likely to be the very last entry on that list.
4733 * So this causes the notifier registry below to try and
4734 * give link-local addresses to all devices besides loopback_dev
4735 * first, then loopback_dev, which cases all the non-loopback_dev
4736 * devices to fail to get a link-local address.
4737 *
4738 * So, as a temporary fix, allocate the ipv6 structure for
4739 * loopback_dev first by hand.
4740 * Longer term, all of the dependencies ipv6 has upon the loopback
4741 * device and it being up should be removed.
4742 */
4743 rtnl_lock();
4744 if (!ipv6_add_dev(init_net.loopback_dev))
4745 err = -ENOMEM;
4746 rtnl_unlock();
4747 if (err)
4748 goto errlo;
4749
4750 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4751 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
4752
4753 register_netdevice_notifier(&ipv6_dev_notf);
4754
4755 addrconf_verify(0);
4756
4757 err = rtnl_af_register(&inet6_ops);
4758 if (err < 0)
4759 goto errout_af;
4760
4761 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
4762 NULL);
4763 if (err < 0)
4764 goto errout;
4765
4766 /* Only the first call to __rtnl_register can fail */
4767 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
4768 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
4769 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
4770 inet6_dump_ifaddr, NULL);
4771 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
4772 inet6_dump_ifmcaddr, NULL);
4773 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
4774 inet6_dump_ifacaddr, NULL);
4775
4776 ipv6_addr_label_rtnl_register();
4777
4778 return 0;
4779 errout:
4780 rtnl_af_unregister(&inet6_ops);
4781 errout_af:
4782 unregister_netdevice_notifier(&ipv6_dev_notf);
4783 errlo:
4784 unregister_pernet_subsys(&addrconf_ops);
4785 out_addrlabel:
4786 ipv6_addr_label_cleanup();
4787 out:
4788 return err;
4789 }
4790
4791 void addrconf_cleanup(void)
4792 {
4793 struct net_device *dev;
4794 int i;
4795
4796 unregister_netdevice_notifier(&ipv6_dev_notf);
4797 unregister_pernet_subsys(&addrconf_ops);
4798 ipv6_addr_label_cleanup();
4799
4800 rtnl_lock();
4801
4802 __rtnl_af_unregister(&inet6_ops);
4803
4804 /* clean dev list */
4805 for_each_netdev(&init_net, dev) {
4806 if (__in6_dev_get(dev) == NULL)
4807 continue;
4808 addrconf_ifdown(dev, 1);
4809 }
4810 addrconf_ifdown(init_net.loopback_dev, 2);
4811
4812 /*
4813 * Check hash table.
4814 */
4815 spin_lock_bh(&addrconf_hash_lock);
4816 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4817 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
4818 spin_unlock_bh(&addrconf_hash_lock);
4819
4820 del_timer(&addr_chk_timer);
4821 rtnl_unlock();
4822 }
linux-next