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Merge branch 'drm-fixes' of git://people.freedesktop.org/~airlied/linux
[zen-stable.git] / net / ipv6 / addrconf.c
blobcf88df82e2c21ca21da8184f0370096b094dffba
1 /*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 */
14
15 /*
16 * Changes:
17 *
18 * Janos Farkas : delete timer on ifdown
19 * <chexum@bankinf.banki.hu>
20 * Andi Kleen : kill double kfree on module
21 * unload.
22 * Maciej W. Rozycki : FDDI support
23 * sekiya@USAGI : Don't send too many RS
24 * packets.
25 * yoshfuji@USAGI : Fixed interval between DAD
26 * packets.
27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
28 * address validation timer.
29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
30 * support.
31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
32 * address on a same interface.
33 * YOSHIFUJI Hideaki @USAGI : ARCnet support
34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
35 * seq_file.
36 * YOSHIFUJI Hideaki @USAGI : improved source address
37 * selection; consider scope,
38 * status etc.
39 */
40
41 #include <linux/errno.h>
42 #include <linux/types.h>
43 #include <linux/kernel.h>
44 #include <linux/socket.h>
45 #include <linux/sockios.h>
46 #include <linux/net.h>
47 #include <linux/in6.h>
48 #include <linux/netdevice.h>
49 #include <linux/if_addr.h>
50 #include <linux/if_arp.h>
51 #include <linux/if_arcnet.h>
52 #include <linux/if_infiniband.h>
53 #include <linux/route.h>
54 #include <linux/inetdevice.h>
55 #include <linux/init.h>
56 #include <linux/slab.h>
57 #ifdef CONFIG_SYSCTL
58 #include <linux/sysctl.h>
59 #endif
60 #include <linux/capability.h>
61 #include <linux/delay.h>
62 #include <linux/notifier.h>
63 #include <linux/string.h>
64
65 #include <net/net_namespace.h>
66 #include <net/sock.h>
67 #include <net/snmp.h>
68
69 #include <net/ipv6.h>
70 #include <net/protocol.h>
71 #include <net/ndisc.h>
72 #include <net/ip6_route.h>
73 #include <net/addrconf.h>
74 #include <net/tcp.h>
75 #include <net/ip.h>
76 #include <net/netlink.h>
77 #include <net/pkt_sched.h>
78 #include <linux/if_tunnel.h>
79 #include <linux/rtnetlink.h>
80
81 #ifdef CONFIG_IPV6_PRIVACY
82 #include <linux/random.h>
83 #endif
84
85 #include <linux/uaccess.h>
86 #include <asm/unaligned.h>
87
88 #include <linux/proc_fs.h>
89 #include <linux/seq_file.h>
90 #include <linux/export.h>
91
92 /* Set to 3 to get tracing... */
93 #define ACONF_DEBUG 2
94
95 #if ACONF_DEBUG >= 3
96 #define ADBG(x) printk x
97 #else
98 #define ADBG(x)
99 #endif
100
101 #define INFINITY_LIFE_TIME 0xFFFFFFFF
102
103 static inline u32 cstamp_delta(unsigned long cstamp)
104 {
105 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
106 }
107
108 #define ADDRCONF_TIMER_FUZZ_MINUS (HZ > 50 ? HZ/50 : 1)
109 #define ADDRCONF_TIMER_FUZZ (HZ / 4)
110 #define ADDRCONF_TIMER_FUZZ_MAX (HZ)
111
112 #ifdef CONFIG_SYSCTL
113 static void addrconf_sysctl_register(struct inet6_dev *idev);
114 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
115 #else
116 static inline void addrconf_sysctl_register(struct inet6_dev *idev)
117 {
118 }
119
120 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
121 {
122 }
123 #endif
124
125 #ifdef CONFIG_IPV6_PRIVACY
126 static int __ipv6_regen_rndid(struct inet6_dev *idev);
127 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
128 static void ipv6_regen_rndid(unsigned long data);
129 #endif
130
131 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
132 static int ipv6_count_addresses(struct inet6_dev *idev);
133
134 /*
135 * Configured unicast address hash table
136 */
137 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
138 static DEFINE_SPINLOCK(addrconf_hash_lock);
139
140 static void addrconf_verify(unsigned long);
141
142 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
143 static DEFINE_SPINLOCK(addrconf_verify_lock);
144
145 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
146 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
147
148 static void addrconf_type_change(struct net_device *dev,
149 unsigned long event);
150 static int addrconf_ifdown(struct net_device *dev, int how);
151
152 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
153 static void addrconf_dad_timer(unsigned long data);
154 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
155 static void addrconf_dad_run(struct inet6_dev *idev);
156 static void addrconf_rs_timer(unsigned long data);
157 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
158 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
159
160 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
161 struct prefix_info *pinfo);
162 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
163 struct net_device *dev);
164
165 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
166
167 static struct ipv6_devconf ipv6_devconf __read_mostly = {
168 .forwarding = 0,
169 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
170 .mtu6 = IPV6_MIN_MTU,
171 .accept_ra = 1,
172 .accept_redirects = 1,
173 .autoconf = 1,
174 .force_mld_version = 0,
175 .dad_transmits = 1,
176 .rtr_solicits = MAX_RTR_SOLICITATIONS,
177 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
178 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
179 #ifdef CONFIG_IPV6_PRIVACY
180 .use_tempaddr = 0,
181 .temp_valid_lft = TEMP_VALID_LIFETIME,
182 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
183 .regen_max_retry = REGEN_MAX_RETRY,
184 .max_desync_factor = MAX_DESYNC_FACTOR,
185 #endif
186 .max_addresses = IPV6_MAX_ADDRESSES,
187 .accept_ra_defrtr = 1,
188 .accept_ra_pinfo = 1,
189 #ifdef CONFIG_IPV6_ROUTER_PREF
190 .accept_ra_rtr_pref = 1,
191 .rtr_probe_interval = 60 * HZ,
192 #ifdef CONFIG_IPV6_ROUTE_INFO
193 .accept_ra_rt_info_max_plen = 0,
194 #endif
195 #endif
196 .proxy_ndp = 0,
197 .accept_source_route = 0, /* we do not accept RH0 by default. */
198 .disable_ipv6 = 0,
199 .accept_dad = 1,
200 };
201
202 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
203 .forwarding = 0,
204 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
205 .mtu6 = IPV6_MIN_MTU,
206 .accept_ra = 1,
207 .accept_redirects = 1,
208 .autoconf = 1,
209 .dad_transmits = 1,
210 .rtr_solicits = MAX_RTR_SOLICITATIONS,
211 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
212 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
213 #ifdef CONFIG_IPV6_PRIVACY
214 .use_tempaddr = 0,
215 .temp_valid_lft = TEMP_VALID_LIFETIME,
216 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
217 .regen_max_retry = REGEN_MAX_RETRY,
218 .max_desync_factor = MAX_DESYNC_FACTOR,
219 #endif
220 .max_addresses = IPV6_MAX_ADDRESSES,
221 .accept_ra_defrtr = 1,
222 .accept_ra_pinfo = 1,
223 #ifdef CONFIG_IPV6_ROUTER_PREF
224 .accept_ra_rtr_pref = 1,
225 .rtr_probe_interval = 60 * HZ,
226 #ifdef CONFIG_IPV6_ROUTE_INFO
227 .accept_ra_rt_info_max_plen = 0,
228 #endif
229 #endif
230 .proxy_ndp = 0,
231 .accept_source_route = 0, /* we do not accept RH0 by default. */
232 .disable_ipv6 = 0,
233 .accept_dad = 1,
234 };
235
236 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
237 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
238 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
239 const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
240 const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
241
242 /* Check if a valid qdisc is available */
243 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
244 {
245 return !qdisc_tx_is_noop(dev);
246 }
247
248 /* Check if a route is valid prefix route */
249 static inline int addrconf_is_prefix_route(const struct rt6_info *rt)
250 {
251 return (rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0;
252 }
253
254 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
255 {
256 if (del_timer(&ifp->timer))
257 __in6_ifa_put(ifp);
258 }
259
260 enum addrconf_timer_t {
261 AC_NONE,
262 AC_DAD,
263 AC_RS,
264 };
265
266 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
267 enum addrconf_timer_t what,
268 unsigned long when)
269 {
270 if (!del_timer(&ifp->timer))
271 in6_ifa_hold(ifp);
272
273 switch (what) {
274 case AC_DAD:
275 ifp->timer.function = addrconf_dad_timer;
276 break;
277 case AC_RS:
278 ifp->timer.function = addrconf_rs_timer;
279 break;
280 default:
281 break;
282 }
283 ifp->timer.expires = jiffies + when;
284 add_timer(&ifp->timer);
285 }
286
287 static int snmp6_alloc_dev(struct inet6_dev *idev)
288 {
289 if (snmp_mib_init((void __percpu **)idev->stats.ipv6,
290 sizeof(struct ipstats_mib),
291 __alignof__(struct ipstats_mib)) < 0)
292 goto err_ip;
293 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
294 GFP_KERNEL);
295 if (!idev->stats.icmpv6dev)
296 goto err_icmp;
297 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
298 GFP_KERNEL);
299 if (!idev->stats.icmpv6msgdev)
300 goto err_icmpmsg;
301
302 return 0;
303
304 err_icmpmsg:
305 kfree(idev->stats.icmpv6dev);
306 err_icmp:
307 snmp_mib_free((void __percpu **)idev->stats.ipv6);
308 err_ip:
309 return -ENOMEM;
310 }
311
312 static void snmp6_free_dev(struct inet6_dev *idev)
313 {
314 kfree(idev->stats.icmpv6msgdev);
315 kfree(idev->stats.icmpv6dev);
316 snmp_mib_free((void __percpu **)idev->stats.ipv6);
317 }
318
319 /* Nobody refers to this device, we may destroy it. */
320
321 void in6_dev_finish_destroy(struct inet6_dev *idev)
322 {
323 struct net_device *dev = idev->dev;
324
325 WARN_ON(!list_empty(&idev->addr_list));
326 WARN_ON(idev->mc_list != NULL);
327
328 #ifdef NET_REFCNT_DEBUG
329 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
330 #endif
331 dev_put(dev);
332 if (!idev->dead) {
333 pr_warning("Freeing alive inet6 device %p\n", idev);
334 return;
335 }
336 snmp6_free_dev(idev);
337 kfree_rcu(idev, rcu);
338 }
339
340 EXPORT_SYMBOL(in6_dev_finish_destroy);
341
342 static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
343 {
344 struct inet6_dev *ndev;
345
346 ASSERT_RTNL();
347
348 if (dev->mtu < IPV6_MIN_MTU)
349 return NULL;
350
351 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
352
353 if (ndev == NULL)
354 return NULL;
355
356 rwlock_init(&ndev->lock);
357 ndev->dev = dev;
358 INIT_LIST_HEAD(&ndev->addr_list);
359
360 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
361 ndev->cnf.mtu6 = dev->mtu;
362 ndev->cnf.sysctl = NULL;
363 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
364 if (ndev->nd_parms == NULL) {
365 kfree(ndev);
366 return NULL;
367 }
368 if (ndev->cnf.forwarding)
369 dev_disable_lro(dev);
370 /* We refer to the device */
371 dev_hold(dev);
372
373 if (snmp6_alloc_dev(ndev) < 0) {
374 ADBG((KERN_WARNING
375 "%s(): cannot allocate memory for statistics; dev=%s.\n",
376 __func__, dev->name));
377 neigh_parms_release(&nd_tbl, ndev->nd_parms);
378 dev_put(dev);
379 kfree(ndev);
380 return NULL;
381 }
382
383 if (snmp6_register_dev(ndev) < 0) {
384 ADBG((KERN_WARNING
385 "%s(): cannot create /proc/net/dev_snmp6/%s\n",
386 __func__, dev->name));
387 neigh_parms_release(&nd_tbl, ndev->nd_parms);
388 ndev->dead = 1;
389 in6_dev_finish_destroy(ndev);
390 return NULL;
391 }
392
393 /* One reference from device. We must do this before
394 * we invoke __ipv6_regen_rndid().
395 */
396 in6_dev_hold(ndev);
397
398 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
399 ndev->cnf.accept_dad = -1;
400
401 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
402 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
403 printk(KERN_INFO
404 "%s: Disabled Multicast RS\n",
405 dev->name);
406 ndev->cnf.rtr_solicits = 0;
407 }
408 #endif
409
410 #ifdef CONFIG_IPV6_PRIVACY
411 INIT_LIST_HEAD(&ndev->tempaddr_list);
412 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
413 if ((dev->flags&IFF_LOOPBACK) ||
414 dev->type == ARPHRD_TUNNEL ||
415 dev->type == ARPHRD_TUNNEL6 ||
416 dev->type == ARPHRD_SIT ||
417 dev->type == ARPHRD_NONE) {
418 ndev->cnf.use_tempaddr = -1;
419 } else {
420 in6_dev_hold(ndev);
421 ipv6_regen_rndid((unsigned long) ndev);
422 }
423 #endif
424
425 if (netif_running(dev) && addrconf_qdisc_ok(dev))
426 ndev->if_flags |= IF_READY;
427
428 ipv6_mc_init_dev(ndev);
429 ndev->tstamp = jiffies;
430 addrconf_sysctl_register(ndev);
431 /* protected by rtnl_lock */
432 RCU_INIT_POINTER(dev->ip6_ptr, ndev);
433
434 /* Join all-node multicast group */
435 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
436
437 return ndev;
438 }
439
440 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
441 {
442 struct inet6_dev *idev;
443
444 ASSERT_RTNL();
445
446 idev = __in6_dev_get(dev);
447 if (!idev) {
448 idev = ipv6_add_dev(dev);
449 if (!idev)
450 return NULL;
451 }
452
453 if (dev->flags&IFF_UP)
454 ipv6_mc_up(idev);
455 return idev;
456 }
457
458 #ifdef CONFIG_SYSCTL
459 static void dev_forward_change(struct inet6_dev *idev)
460 {
461 struct net_device *dev;
462 struct inet6_ifaddr *ifa;
463
464 if (!idev)
465 return;
466 dev = idev->dev;
467 if (idev->cnf.forwarding)
468 dev_disable_lro(dev);
469 if (dev && (dev->flags & IFF_MULTICAST)) {
470 if (idev->cnf.forwarding)
471 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
472 else
473 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
474 }
475
476 list_for_each_entry(ifa, &idev->addr_list, if_list) {
477 if (ifa->flags&IFA_F_TENTATIVE)
478 continue;
479 if (idev->cnf.forwarding)
480 addrconf_join_anycast(ifa);
481 else
482 addrconf_leave_anycast(ifa);
483 }
484 }
485
486
487 static void addrconf_forward_change(struct net *net, __s32 newf)
488 {
489 struct net_device *dev;
490 struct inet6_dev *idev;
491
492 rcu_read_lock();
493 for_each_netdev_rcu(net, dev) {
494 idev = __in6_dev_get(dev);
495 if (idev) {
496 int changed = (!idev->cnf.forwarding) ^ (!newf);
497 idev->cnf.forwarding = newf;
498 if (changed)
499 dev_forward_change(idev);
500 }
501 }
502 rcu_read_unlock();
503 }
504
505 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old)
506 {
507 struct net *net;
508
509 net = (struct net *)table->extra2;
510 if (p == &net->ipv6.devconf_dflt->forwarding)
511 return 0;
512
513 if (!rtnl_trylock()) {
514 /* Restore the original values before restarting */
515 *p = old;
516 return restart_syscall();
517 }
518
519 if (p == &net->ipv6.devconf_all->forwarding) {
520 __s32 newf = net->ipv6.devconf_all->forwarding;
521 net->ipv6.devconf_dflt->forwarding = newf;
522 addrconf_forward_change(net, newf);
523 } else if ((!*p) ^ (!old))
524 dev_forward_change((struct inet6_dev *)table->extra1);
525 rtnl_unlock();
526
527 if (*p)
528 rt6_purge_dflt_routers(net);
529 return 1;
530 }
531 #endif
532
533 /* Nobody refers to this ifaddr, destroy it */
534 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
535 {
536 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
537
538 #ifdef NET_REFCNT_DEBUG
539 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
540 #endif
541
542 in6_dev_put(ifp->idev);
543
544 if (del_timer(&ifp->timer))
545 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp);
546
547 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
548 pr_warning("Freeing alive inet6 address %p\n", ifp);
549 return;
550 }
551 dst_release(&ifp->rt->dst);
552
553 kfree_rcu(ifp, rcu);
554 }
555
556 static void
557 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
558 {
559 struct list_head *p;
560 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
561
562 /*
563 * Each device address list is sorted in order of scope -
564 * global before linklocal.
565 */
566 list_for_each(p, &idev->addr_list) {
567 struct inet6_ifaddr *ifa
568 = list_entry(p, struct inet6_ifaddr, if_list);
569 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
570 break;
571 }
572
573 list_add_tail(&ifp->if_list, p);
574 }
575
576 static u32 ipv6_addr_hash(const struct in6_addr *addr)
577 {
578 /*
579 * We perform the hash function over the last 64 bits of the address
580 * This will include the IEEE address token on links that support it.
581 */
582 return jhash_2words((__force u32)addr->s6_addr32[2],
583 (__force u32)addr->s6_addr32[3], 0)
584 & (IN6_ADDR_HSIZE - 1);
585 }
586
587 /* On success it returns ifp with increased reference count */
588
589 static struct inet6_ifaddr *
590 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
591 int scope, u32 flags)
592 {
593 struct inet6_ifaddr *ifa = NULL;
594 struct rt6_info *rt;
595 unsigned int hash;
596 int err = 0;
597 int addr_type = ipv6_addr_type(addr);
598
599 if (addr_type == IPV6_ADDR_ANY ||
600 addr_type & IPV6_ADDR_MULTICAST ||
601 (!(idev->dev->flags & IFF_LOOPBACK) &&
602 addr_type & IPV6_ADDR_LOOPBACK))
603 return ERR_PTR(-EADDRNOTAVAIL);
604
605 rcu_read_lock_bh();
606 if (idev->dead) {
607 err = -ENODEV; /*XXX*/
608 goto out2;
609 }
610
611 if (idev->cnf.disable_ipv6) {
612 err = -EACCES;
613 goto out2;
614 }
615
616 spin_lock(&addrconf_hash_lock);
617
618 /* Ignore adding duplicate addresses on an interface */
619 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
620 ADBG(("ipv6_add_addr: already assigned\n"));
621 err = -EEXIST;
622 goto out;
623 }
624
625 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
626
627 if (ifa == NULL) {
628 ADBG(("ipv6_add_addr: malloc failed\n"));
629 err = -ENOBUFS;
630 goto out;
631 }
632
633 rt = addrconf_dst_alloc(idev, addr, 0);
634 if (IS_ERR(rt)) {
635 err = PTR_ERR(rt);
636 goto out;
637 }
638
639 ipv6_addr_copy(&ifa->addr, addr);
640
641 spin_lock_init(&ifa->lock);
642 spin_lock_init(&ifa->state_lock);
643 init_timer(&ifa->timer);
644 INIT_HLIST_NODE(&ifa->addr_lst);
645 ifa->timer.data = (unsigned long) ifa;
646 ifa->scope = scope;
647 ifa->prefix_len = pfxlen;
648 ifa->flags = flags | IFA_F_TENTATIVE;
649 ifa->cstamp = ifa->tstamp = jiffies;
650
651 ifa->rt = rt;
652
653 /*
654 * part one of RFC 4429, section 3.3
655 * We should not configure an address as
656 * optimistic if we do not yet know the link
657 * layer address of our nexhop router
658 */
659
660 if (dst_get_neighbour_raw(&rt->dst) == NULL)
661 ifa->flags &= ~IFA_F_OPTIMISTIC;
662
663 ifa->idev = idev;
664 in6_dev_hold(idev);
665 /* For caller */
666 in6_ifa_hold(ifa);
667
668 /* Add to big hash table */
669 hash = ipv6_addr_hash(addr);
670
671 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
672 spin_unlock(&addrconf_hash_lock);
673
674 write_lock(&idev->lock);
675 /* Add to inet6_dev unicast addr list. */
676 ipv6_link_dev_addr(idev, ifa);
677
678 #ifdef CONFIG_IPV6_PRIVACY
679 if (ifa->flags&IFA_F_TEMPORARY) {
680 list_add(&ifa->tmp_list, &idev->tempaddr_list);
681 in6_ifa_hold(ifa);
682 }
683 #endif
684
685 in6_ifa_hold(ifa);
686 write_unlock(&idev->lock);
687 out2:
688 rcu_read_unlock_bh();
689
690 if (likely(err == 0))
691 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
692 else {
693 kfree(ifa);
694 ifa = ERR_PTR(err);
695 }
696
697 return ifa;
698 out:
699 spin_unlock(&addrconf_hash_lock);
700 goto out2;
701 }
702
703 /* This function wants to get referenced ifp and releases it before return */
704
705 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
706 {
707 struct inet6_ifaddr *ifa, *ifn;
708 struct inet6_dev *idev = ifp->idev;
709 int state;
710 int deleted = 0, onlink = 0;
711 unsigned long expires = jiffies;
712
713 spin_lock_bh(&ifp->state_lock);
714 state = ifp->state;
715 ifp->state = INET6_IFADDR_STATE_DEAD;
716 spin_unlock_bh(&ifp->state_lock);
717
718 if (state == INET6_IFADDR_STATE_DEAD)
719 goto out;
720
721 spin_lock_bh(&addrconf_hash_lock);
722 hlist_del_init_rcu(&ifp->addr_lst);
723 spin_unlock_bh(&addrconf_hash_lock);
724
725 write_lock_bh(&idev->lock);
726 #ifdef CONFIG_IPV6_PRIVACY
727 if (ifp->flags&IFA_F_TEMPORARY) {
728 list_del(&ifp->tmp_list);
729 if (ifp->ifpub) {
730 in6_ifa_put(ifp->ifpub);
731 ifp->ifpub = NULL;
732 }
733 __in6_ifa_put(ifp);
734 }
735 #endif
736
737 list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) {
738 if (ifa == ifp) {
739 list_del_init(&ifp->if_list);
740 __in6_ifa_put(ifp);
741
742 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
743 break;
744 deleted = 1;
745 continue;
746 } else if (ifp->flags & IFA_F_PERMANENT) {
747 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
748 ifp->prefix_len)) {
749 if (ifa->flags & IFA_F_PERMANENT) {
750 onlink = 1;
751 if (deleted)
752 break;
753 } else {
754 unsigned long lifetime;
755
756 if (!onlink)
757 onlink = -1;
758
759 spin_lock(&ifa->lock);
760
761 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
762 /*
763 * Note: Because this address is
764 * not permanent, lifetime <
765 * LONG_MAX / HZ here.
766 */
767 if (time_before(expires,
768 ifa->tstamp + lifetime * HZ))
769 expires = ifa->tstamp + lifetime * HZ;
770 spin_unlock(&ifa->lock);
771 }
772 }
773 }
774 }
775 write_unlock_bh(&idev->lock);
776
777 addrconf_del_timer(ifp);
778
779 ipv6_ifa_notify(RTM_DELADDR, ifp);
780
781 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
782
783 /*
784 * Purge or update corresponding prefix
785 *
786 * 1) we don't purge prefix here if address was not permanent.
787 * prefix is managed by its own lifetime.
788 * 2) if there're no addresses, delete prefix.
789 * 3) if there're still other permanent address(es),
790 * corresponding prefix is still permanent.
791 * 4) otherwise, update prefix lifetime to the
792 * longest valid lifetime among the corresponding
793 * addresses on the device.
794 * Note: subsequent RA will update lifetime.
795 *
796 * --yoshfuji
797 */
798 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
799 struct in6_addr prefix;
800 struct rt6_info *rt;
801 struct net *net = dev_net(ifp->idev->dev);
802 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
803 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1);
804
805 if (rt && addrconf_is_prefix_route(rt)) {
806 if (onlink == 0) {
807 ip6_del_rt(rt);
808 rt = NULL;
809 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
810 rt->rt6i_expires = expires;
811 rt->rt6i_flags |= RTF_EXPIRES;
812 }
813 }
814 dst_release(&rt->dst);
815 }
816
817 /* clean up prefsrc entries */
818 rt6_remove_prefsrc(ifp);
819 out:
820 in6_ifa_put(ifp);
821 }
822
823 #ifdef CONFIG_IPV6_PRIVACY
824 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
825 {
826 struct inet6_dev *idev = ifp->idev;
827 struct in6_addr addr, *tmpaddr;
828 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
829 unsigned long regen_advance;
830 int tmp_plen;
831 int ret = 0;
832 int max_addresses;
833 u32 addr_flags;
834 unsigned long now = jiffies;
835
836 write_lock(&idev->lock);
837 if (ift) {
838 spin_lock_bh(&ift->lock);
839 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
840 spin_unlock_bh(&ift->lock);
841 tmpaddr = &addr;
842 } else {
843 tmpaddr = NULL;
844 }
845 retry:
846 in6_dev_hold(idev);
847 if (idev->cnf.use_tempaddr <= 0) {
848 write_unlock(&idev->lock);
849 printk(KERN_INFO
850 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
851 in6_dev_put(idev);
852 ret = -1;
853 goto out;
854 }
855 spin_lock_bh(&ifp->lock);
856 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
857 idev->cnf.use_tempaddr = -1; /*XXX*/
858 spin_unlock_bh(&ifp->lock);
859 write_unlock(&idev->lock);
860 printk(KERN_WARNING
861 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
862 in6_dev_put(idev);
863 ret = -1;
864 goto out;
865 }
866 in6_ifa_hold(ifp);
867 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
868 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
869 spin_unlock_bh(&ifp->lock);
870 write_unlock(&idev->lock);
871 printk(KERN_WARNING
872 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
873 in6_ifa_put(ifp);
874 in6_dev_put(idev);
875 ret = -1;
876 goto out;
877 }
878 memcpy(&addr.s6_addr[8], idev->rndid, 8);
879 age = (now - ifp->tstamp) / HZ;
880 tmp_valid_lft = min_t(__u32,
881 ifp->valid_lft,
882 idev->cnf.temp_valid_lft + age);
883 tmp_prefered_lft = min_t(__u32,
884 ifp->prefered_lft,
885 idev->cnf.temp_prefered_lft + age -
886 idev->cnf.max_desync_factor);
887 tmp_plen = ifp->prefix_len;
888 max_addresses = idev->cnf.max_addresses;
889 tmp_tstamp = ifp->tstamp;
890 spin_unlock_bh(&ifp->lock);
891
892 regen_advance = idev->cnf.regen_max_retry *
893 idev->cnf.dad_transmits *
894 idev->nd_parms->retrans_time / HZ;
895 write_unlock(&idev->lock);
896
897 /* A temporary address is created only if this calculated Preferred
898 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
899 * an implementation must not create a temporary address with a zero
900 * Preferred Lifetime.
901 */
902 if (tmp_prefered_lft <= regen_advance) {
903 in6_ifa_put(ifp);
904 in6_dev_put(idev);
905 ret = -1;
906 goto out;
907 }
908
909 addr_flags = IFA_F_TEMPORARY;
910 /* set in addrconf_prefix_rcv() */
911 if (ifp->flags & IFA_F_OPTIMISTIC)
912 addr_flags |= IFA_F_OPTIMISTIC;
913
914 ift = !max_addresses ||
915 ipv6_count_addresses(idev) < max_addresses ?
916 ipv6_add_addr(idev, &addr, tmp_plen,
917 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
918 addr_flags) : NULL;
919 if (!ift || IS_ERR(ift)) {
920 in6_ifa_put(ifp);
921 in6_dev_put(idev);
922 printk(KERN_INFO
923 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
924 tmpaddr = &addr;
925 write_lock(&idev->lock);
926 goto retry;
927 }
928
929 spin_lock_bh(&ift->lock);
930 ift->ifpub = ifp;
931 ift->valid_lft = tmp_valid_lft;
932 ift->prefered_lft = tmp_prefered_lft;
933 ift->cstamp = now;
934 ift->tstamp = tmp_tstamp;
935 spin_unlock_bh(&ift->lock);
936
937 addrconf_dad_start(ift, 0);
938 in6_ifa_put(ift);
939 in6_dev_put(idev);
940 out:
941 return ret;
942 }
943 #endif
944
945 /*
946 * Choose an appropriate source address (RFC3484)
947 */
948 enum {
949 IPV6_SADDR_RULE_INIT = 0,
950 IPV6_SADDR_RULE_LOCAL,
951 IPV6_SADDR_RULE_SCOPE,
952 IPV6_SADDR_RULE_PREFERRED,
953 #ifdef CONFIG_IPV6_MIP6
954 IPV6_SADDR_RULE_HOA,
955 #endif
956 IPV6_SADDR_RULE_OIF,
957 IPV6_SADDR_RULE_LABEL,
958 #ifdef CONFIG_IPV6_PRIVACY
959 IPV6_SADDR_RULE_PRIVACY,
960 #endif
961 IPV6_SADDR_RULE_ORCHID,
962 IPV6_SADDR_RULE_PREFIX,
963 IPV6_SADDR_RULE_MAX
964 };
965
966 struct ipv6_saddr_score {
967 int rule;
968 int addr_type;
969 struct inet6_ifaddr *ifa;
970 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
971 int scopedist;
972 int matchlen;
973 };
974
975 struct ipv6_saddr_dst {
976 const struct in6_addr *addr;
977 int ifindex;
978 int scope;
979 int label;
980 unsigned int prefs;
981 };
982
983 static inline int ipv6_saddr_preferred(int type)
984 {
985 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
986 return 1;
987 return 0;
988 }
989
990 static int ipv6_get_saddr_eval(struct net *net,
991 struct ipv6_saddr_score *score,
992 struct ipv6_saddr_dst *dst,
993 int i)
994 {
995 int ret;
996
997 if (i <= score->rule) {
998 switch (i) {
999 case IPV6_SADDR_RULE_SCOPE:
1000 ret = score->scopedist;
1001 break;
1002 case IPV6_SADDR_RULE_PREFIX:
1003 ret = score->matchlen;
1004 break;
1005 default:
1006 ret = !!test_bit(i, score->scorebits);
1007 }
1008 goto out;
1009 }
1010
1011 switch (i) {
1012 case IPV6_SADDR_RULE_INIT:
1013 /* Rule 0: remember if hiscore is not ready yet */
1014 ret = !!score->ifa;
1015 break;
1016 case IPV6_SADDR_RULE_LOCAL:
1017 /* Rule 1: Prefer same address */
1018 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1019 break;
1020 case IPV6_SADDR_RULE_SCOPE:
1021 /* Rule 2: Prefer appropriate scope
1022 *
1023 * ret
1024 * ^
1025 * -1 | d 15
1026 * ---+--+-+---> scope
1027 * |
1028 * | d is scope of the destination.
1029 * B-d | \
1030 * | \ <- smaller scope is better if
1031 * B-15 | \ if scope is enough for destinaion.
1032 * | ret = B - scope (-1 <= scope >= d <= 15).
1033 * d-C-1 | /
1034 * |/ <- greater is better
1035 * -C / if scope is not enough for destination.
1036 * /| ret = scope - C (-1 <= d < scope <= 15).
1037 *
1038 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1039 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1040 * Assume B = 0 and we get C > 29.
1041 */
1042 ret = __ipv6_addr_src_scope(score->addr_type);
1043 if (ret >= dst->scope)
1044 ret = -ret;
1045 else
1046 ret -= 128; /* 30 is enough */
1047 score->scopedist = ret;
1048 break;
1049 case IPV6_SADDR_RULE_PREFERRED:
1050 /* Rule 3: Avoid deprecated and optimistic addresses */
1051 ret = ipv6_saddr_preferred(score->addr_type) ||
1052 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1053 break;
1054 #ifdef CONFIG_IPV6_MIP6
1055 case IPV6_SADDR_RULE_HOA:
1056 {
1057 /* Rule 4: Prefer home address */
1058 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1059 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1060 break;
1061 }
1062 #endif
1063 case IPV6_SADDR_RULE_OIF:
1064 /* Rule 5: Prefer outgoing interface */
1065 ret = (!dst->ifindex ||
1066 dst->ifindex == score->ifa->idev->dev->ifindex);
1067 break;
1068 case IPV6_SADDR_RULE_LABEL:
1069 /* Rule 6: Prefer matching label */
1070 ret = ipv6_addr_label(net,
1071 &score->ifa->addr, score->addr_type,
1072 score->ifa->idev->dev->ifindex) == dst->label;
1073 break;
1074 #ifdef CONFIG_IPV6_PRIVACY
1075 case IPV6_SADDR_RULE_PRIVACY:
1076 {
1077 /* Rule 7: Prefer public address
1078 * Note: prefer temporary address if use_tempaddr >= 2
1079 */
1080 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1081 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1082 score->ifa->idev->cnf.use_tempaddr >= 2;
1083 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1084 break;
1085 }
1086 #endif
1087 case IPV6_SADDR_RULE_ORCHID:
1088 /* Rule 8-: Prefer ORCHID vs ORCHID or
1089 * non-ORCHID vs non-ORCHID
1090 */
1091 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1092 ipv6_addr_orchid(dst->addr));
1093 break;
1094 case IPV6_SADDR_RULE_PREFIX:
1095 /* Rule 8: Use longest matching prefix */
1096 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr,
1097 dst->addr);
1098 break;
1099 default:
1100 ret = 0;
1101 }
1102
1103 if (ret)
1104 __set_bit(i, score->scorebits);
1105 score->rule = i;
1106 out:
1107 return ret;
1108 }
1109
1110 int ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev,
1111 const struct in6_addr *daddr, unsigned int prefs,
1112 struct in6_addr *saddr)
1113 {
1114 struct ipv6_saddr_score scores[2],
1115 *score = &scores[0], *hiscore = &scores[1];
1116 struct ipv6_saddr_dst dst;
1117 struct net_device *dev;
1118 int dst_type;
1119
1120 dst_type = __ipv6_addr_type(daddr);
1121 dst.addr = daddr;
1122 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1123 dst.scope = __ipv6_addr_src_scope(dst_type);
1124 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1125 dst.prefs = prefs;
1126
1127 hiscore->rule = -1;
1128 hiscore->ifa = NULL;
1129
1130 rcu_read_lock();
1131
1132 for_each_netdev_rcu(net, dev) {
1133 struct inet6_dev *idev;
1134
1135 /* Candidate Source Address (section 4)
1136 * - multicast and link-local destination address,
1137 * the set of candidate source address MUST only
1138 * include addresses assigned to interfaces
1139 * belonging to the same link as the outgoing
1140 * interface.
1141 * (- For site-local destination addresses, the
1142 * set of candidate source addresses MUST only
1143 * include addresses assigned to interfaces
1144 * belonging to the same site as the outgoing
1145 * interface.)
1146 */
1147 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1148 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1149 dst.ifindex && dev->ifindex != dst.ifindex)
1150 continue;
1151
1152 idev = __in6_dev_get(dev);
1153 if (!idev)
1154 continue;
1155
1156 read_lock_bh(&idev->lock);
1157 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1158 int i;
1159
1160 /*
1161 * - Tentative Address (RFC2462 section 5.4)
1162 * - A tentative address is not considered
1163 * "assigned to an interface" in the traditional
1164 * sense, unless it is also flagged as optimistic.
1165 * - Candidate Source Address (section 4)
1166 * - In any case, anycast addresses, multicast
1167 * addresses, and the unspecified address MUST
1168 * NOT be included in a candidate set.
1169 */
1170 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1171 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1172 continue;
1173
1174 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1175
1176 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1177 score->addr_type & IPV6_ADDR_MULTICAST)) {
1178 LIMIT_NETDEBUG(KERN_DEBUG
1179 "ADDRCONF: unspecified / multicast address "
1180 "assigned as unicast address on %s",
1181 dev->name);
1182 continue;
1183 }
1184
1185 score->rule = -1;
1186 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1187
1188 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1189 int minihiscore, miniscore;
1190
1191 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1192 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1193
1194 if (minihiscore > miniscore) {
1195 if (i == IPV6_SADDR_RULE_SCOPE &&
1196 score->scopedist > 0) {
1197 /*
1198 * special case:
1199 * each remaining entry
1200 * has too small (not enough)
1201 * scope, because ifa entries
1202 * are sorted by their scope
1203 * values.
1204 */
1205 goto try_nextdev;
1206 }
1207 break;
1208 } else if (minihiscore < miniscore) {
1209 if (hiscore->ifa)
1210 in6_ifa_put(hiscore->ifa);
1211
1212 in6_ifa_hold(score->ifa);
1213
1214 swap(hiscore, score);
1215
1216 /* restore our iterator */
1217 score->ifa = hiscore->ifa;
1218
1219 break;
1220 }
1221 }
1222 }
1223 try_nextdev:
1224 read_unlock_bh(&idev->lock);
1225 }
1226 rcu_read_unlock();
1227
1228 if (!hiscore->ifa)
1229 return -EADDRNOTAVAIL;
1230
1231 ipv6_addr_copy(saddr, &hiscore->ifa->addr);
1232 in6_ifa_put(hiscore->ifa);
1233 return 0;
1234 }
1235 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1236
1237 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1238 unsigned char banned_flags)
1239 {
1240 struct inet6_dev *idev;
1241 int err = -EADDRNOTAVAIL;
1242
1243 rcu_read_lock();
1244 idev = __in6_dev_get(dev);
1245 if (idev) {
1246 struct inet6_ifaddr *ifp;
1247
1248 read_lock_bh(&idev->lock);
1249 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1250 if (ifp->scope == IFA_LINK &&
1251 !(ifp->flags & banned_flags)) {
1252 ipv6_addr_copy(addr, &ifp->addr);
1253 err = 0;
1254 break;
1255 }
1256 }
1257 read_unlock_bh(&idev->lock);
1258 }
1259 rcu_read_unlock();
1260 return err;
1261 }
1262
1263 static int ipv6_count_addresses(struct inet6_dev *idev)
1264 {
1265 int cnt = 0;
1266 struct inet6_ifaddr *ifp;
1267
1268 read_lock_bh(&idev->lock);
1269 list_for_each_entry(ifp, &idev->addr_list, if_list)
1270 cnt++;
1271 read_unlock_bh(&idev->lock);
1272 return cnt;
1273 }
1274
1275 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1276 struct net_device *dev, int strict)
1277 {
1278 struct inet6_ifaddr *ifp;
1279 struct hlist_node *node;
1280 unsigned int hash = ipv6_addr_hash(addr);
1281
1282 rcu_read_lock_bh();
1283 hlist_for_each_entry_rcu(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1284 if (!net_eq(dev_net(ifp->idev->dev), net))
1285 continue;
1286 if (ipv6_addr_equal(&ifp->addr, addr) &&
1287 !(ifp->flags&IFA_F_TENTATIVE) &&
1288 (dev == NULL || ifp->idev->dev == dev ||
1289 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1290 rcu_read_unlock_bh();
1291 return 1;
1292 }
1293 }
1294
1295 rcu_read_unlock_bh();
1296 return 0;
1297 }
1298 EXPORT_SYMBOL(ipv6_chk_addr);
1299
1300 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1301 struct net_device *dev)
1302 {
1303 unsigned int hash = ipv6_addr_hash(addr);
1304 struct inet6_ifaddr *ifp;
1305 struct hlist_node *node;
1306
1307 hlist_for_each_entry(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1308 if (!net_eq(dev_net(ifp->idev->dev), net))
1309 continue;
1310 if (ipv6_addr_equal(&ifp->addr, addr)) {
1311 if (dev == NULL || ifp->idev->dev == dev)
1312 return true;
1313 }
1314 }
1315 return false;
1316 }
1317
1318 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1319 {
1320 struct inet6_dev *idev;
1321 struct inet6_ifaddr *ifa;
1322 int onlink;
1323
1324 onlink = 0;
1325 rcu_read_lock();
1326 idev = __in6_dev_get(dev);
1327 if (idev) {
1328 read_lock_bh(&idev->lock);
1329 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1330 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1331 ifa->prefix_len);
1332 if (onlink)
1333 break;
1334 }
1335 read_unlock_bh(&idev->lock);
1336 }
1337 rcu_read_unlock();
1338 return onlink;
1339 }
1340
1341 EXPORT_SYMBOL(ipv6_chk_prefix);
1342
1343 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1344 struct net_device *dev, int strict)
1345 {
1346 struct inet6_ifaddr *ifp, *result = NULL;
1347 unsigned int hash = ipv6_addr_hash(addr);
1348 struct hlist_node *node;
1349
1350 rcu_read_lock_bh();
1351 hlist_for_each_entry_rcu_bh(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1352 if (!net_eq(dev_net(ifp->idev->dev), net))
1353 continue;
1354 if (ipv6_addr_equal(&ifp->addr, addr)) {
1355 if (dev == NULL || ifp->idev->dev == dev ||
1356 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1357 result = ifp;
1358 in6_ifa_hold(ifp);
1359 break;
1360 }
1361 }
1362 }
1363 rcu_read_unlock_bh();
1364
1365 return result;
1366 }
1367
1368 /* Gets referenced address, destroys ifaddr */
1369
1370 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1371 {
1372 if (ifp->flags&IFA_F_PERMANENT) {
1373 spin_lock_bh(&ifp->lock);
1374 addrconf_del_timer(ifp);
1375 ifp->flags |= IFA_F_TENTATIVE;
1376 if (dad_failed)
1377 ifp->flags |= IFA_F_DADFAILED;
1378 spin_unlock_bh(&ifp->lock);
1379 if (dad_failed)
1380 ipv6_ifa_notify(0, ifp);
1381 in6_ifa_put(ifp);
1382 #ifdef CONFIG_IPV6_PRIVACY
1383 } else if (ifp->flags&IFA_F_TEMPORARY) {
1384 struct inet6_ifaddr *ifpub;
1385 spin_lock_bh(&ifp->lock);
1386 ifpub = ifp->ifpub;
1387 if (ifpub) {
1388 in6_ifa_hold(ifpub);
1389 spin_unlock_bh(&ifp->lock);
1390 ipv6_create_tempaddr(ifpub, ifp);
1391 in6_ifa_put(ifpub);
1392 } else {
1393 spin_unlock_bh(&ifp->lock);
1394 }
1395 ipv6_del_addr(ifp);
1396 #endif
1397 } else
1398 ipv6_del_addr(ifp);
1399 }
1400
1401 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1402 {
1403 int err = -ENOENT;
1404
1405 spin_lock(&ifp->state_lock);
1406 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1407 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1408 err = 0;
1409 }
1410 spin_unlock(&ifp->state_lock);
1411
1412 return err;
1413 }
1414
1415 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1416 {
1417 struct inet6_dev *idev = ifp->idev;
1418
1419 if (addrconf_dad_end(ifp)) {
1420 in6_ifa_put(ifp);
1421 return;
1422 }
1423
1424 if (net_ratelimit())
1425 printk(KERN_INFO "%s: IPv6 duplicate address %pI6c detected!\n",
1426 ifp->idev->dev->name, &ifp->addr);
1427
1428 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1429 struct in6_addr addr;
1430
1431 addr.s6_addr32[0] = htonl(0xfe800000);
1432 addr.s6_addr32[1] = 0;
1433
1434 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1435 ipv6_addr_equal(&ifp->addr, &addr)) {
1436 /* DAD failed for link-local based on MAC address */
1437 idev->cnf.disable_ipv6 = 1;
1438
1439 printk(KERN_INFO "%s: IPv6 being disabled!\n",
1440 ifp->idev->dev->name);
1441 }
1442 }
1443
1444 addrconf_dad_stop(ifp, 1);
1445 }
1446
1447 /* Join to solicited addr multicast group. */
1448
1449 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1450 {
1451 struct in6_addr maddr;
1452
1453 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1454 return;
1455
1456 addrconf_addr_solict_mult(addr, &maddr);
1457 ipv6_dev_mc_inc(dev, &maddr);
1458 }
1459
1460 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1461 {
1462 struct in6_addr maddr;
1463
1464 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1465 return;
1466
1467 addrconf_addr_solict_mult(addr, &maddr);
1468 __ipv6_dev_mc_dec(idev, &maddr);
1469 }
1470
1471 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1472 {
1473 struct in6_addr addr;
1474 if (ifp->prefix_len == 127) /* RFC 6164 */
1475 return;
1476 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1477 if (ipv6_addr_any(&addr))
1478 return;
1479 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1480 }
1481
1482 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1483 {
1484 struct in6_addr addr;
1485 if (ifp->prefix_len == 127) /* RFC 6164 */
1486 return;
1487 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1488 if (ipv6_addr_any(&addr))
1489 return;
1490 __ipv6_dev_ac_dec(ifp->idev, &addr);
1491 }
1492
1493 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1494 {
1495 if (dev->addr_len != ETH_ALEN)
1496 return -1;
1497 memcpy(eui, dev->dev_addr, 3);
1498 memcpy(eui + 5, dev->dev_addr + 3, 3);
1499
1500 /*
1501 * The zSeries OSA network cards can be shared among various
1502 * OS instances, but the OSA cards have only one MAC address.
1503 * This leads to duplicate address conflicts in conjunction
1504 * with IPv6 if more than one instance uses the same card.
1505 *
1506 * The driver for these cards can deliver a unique 16-bit
1507 * identifier for each instance sharing the same card. It is
1508 * placed instead of 0xFFFE in the interface identifier. The
1509 * "u" bit of the interface identifier is not inverted in this
1510 * case. Hence the resulting interface identifier has local
1511 * scope according to RFC2373.
1512 */
1513 if (dev->dev_id) {
1514 eui[3] = (dev->dev_id >> 8) & 0xFF;
1515 eui[4] = dev->dev_id & 0xFF;
1516 } else {
1517 eui[3] = 0xFF;
1518 eui[4] = 0xFE;
1519 eui[0] ^= 2;
1520 }
1521 return 0;
1522 }
1523
1524 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1525 {
1526 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1527 if (dev->addr_len != ARCNET_ALEN)
1528 return -1;
1529 memset(eui, 0, 7);
1530 eui[7] = *(u8*)dev->dev_addr;
1531 return 0;
1532 }
1533
1534 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1535 {
1536 if (dev->addr_len != INFINIBAND_ALEN)
1537 return -1;
1538 memcpy(eui, dev->dev_addr + 12, 8);
1539 eui[0] |= 2;
1540 return 0;
1541 }
1542
1543 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1544 {
1545 if (addr == 0)
1546 return -1;
1547 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1548 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1549 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1550 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1551 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1552 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1553 eui[1] = 0;
1554 eui[2] = 0x5E;
1555 eui[3] = 0xFE;
1556 memcpy(eui + 4, &addr, 4);
1557 return 0;
1558 }
1559
1560 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1561 {
1562 if (dev->priv_flags & IFF_ISATAP)
1563 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1564 return -1;
1565 }
1566
1567 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
1568 {
1569 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1570 }
1571
1572 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1573 {
1574 switch (dev->type) {
1575 case ARPHRD_ETHER:
1576 case ARPHRD_FDDI:
1577 case ARPHRD_IEEE802_TR:
1578 return addrconf_ifid_eui48(eui, dev);
1579 case ARPHRD_ARCNET:
1580 return addrconf_ifid_arcnet(eui, dev);
1581 case ARPHRD_INFINIBAND:
1582 return addrconf_ifid_infiniband(eui, dev);
1583 case ARPHRD_SIT:
1584 return addrconf_ifid_sit(eui, dev);
1585 case ARPHRD_IPGRE:
1586 return addrconf_ifid_gre(eui, dev);
1587 }
1588 return -1;
1589 }
1590
1591 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1592 {
1593 int err = -1;
1594 struct inet6_ifaddr *ifp;
1595
1596 read_lock_bh(&idev->lock);
1597 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1598 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1599 memcpy(eui, ifp->addr.s6_addr+8, 8);
1600 err = 0;
1601 break;
1602 }
1603 }
1604 read_unlock_bh(&idev->lock);
1605 return err;
1606 }
1607
1608 #ifdef CONFIG_IPV6_PRIVACY
1609 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1610 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1611 {
1612 regen:
1613 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1614 idev->rndid[0] &= ~0x02;
1615
1616 /*
1617 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1618 * check if generated address is not inappropriate
1619 *
1620 * - Reserved subnet anycast (RFC 2526)
1621 * 11111101 11....11 1xxxxxxx
1622 * - ISATAP (RFC4214) 6.1
1623 * 00-00-5E-FE-xx-xx-xx-xx
1624 * - value 0
1625 * - XXX: already assigned to an address on the device
1626 */
1627 if (idev->rndid[0] == 0xfd &&
1628 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1629 (idev->rndid[7]&0x80))
1630 goto regen;
1631 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1632 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1633 goto regen;
1634 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1635 goto regen;
1636 }
1637
1638 return 0;
1639 }
1640
1641 static void ipv6_regen_rndid(unsigned long data)
1642 {
1643 struct inet6_dev *idev = (struct inet6_dev *) data;
1644 unsigned long expires;
1645
1646 rcu_read_lock_bh();
1647 write_lock_bh(&idev->lock);
1648
1649 if (idev->dead)
1650 goto out;
1651
1652 if (__ipv6_regen_rndid(idev) < 0)
1653 goto out;
1654
1655 expires = jiffies +
1656 idev->cnf.temp_prefered_lft * HZ -
1657 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time -
1658 idev->cnf.max_desync_factor * HZ;
1659 if (time_before(expires, jiffies)) {
1660 printk(KERN_WARNING
1661 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1662 idev->dev->name);
1663 goto out;
1664 }
1665
1666 if (!mod_timer(&idev->regen_timer, expires))
1667 in6_dev_hold(idev);
1668
1669 out:
1670 write_unlock_bh(&idev->lock);
1671 rcu_read_unlock_bh();
1672 in6_dev_put(idev);
1673 }
1674
1675 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1676 int ret = 0;
1677
1678 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1679 ret = __ipv6_regen_rndid(idev);
1680 return ret;
1681 }
1682 #endif
1683
1684 /*
1685 * Add prefix route.
1686 */
1687
1688 static void
1689 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1690 unsigned long expires, u32 flags)
1691 {
1692 struct fib6_config cfg = {
1693 .fc_table = RT6_TABLE_PREFIX,
1694 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1695 .fc_ifindex = dev->ifindex,
1696 .fc_expires = expires,
1697 .fc_dst_len = plen,
1698 .fc_flags = RTF_UP | flags,
1699 .fc_nlinfo.nl_net = dev_net(dev),
1700 .fc_protocol = RTPROT_KERNEL,
1701 };
1702
1703 ipv6_addr_copy(&cfg.fc_dst, pfx);
1704
1705 /* Prevent useless cloning on PtP SIT.
1706 This thing is done here expecting that the whole
1707 class of non-broadcast devices need not cloning.
1708 */
1709 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1710 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1711 cfg.fc_flags |= RTF_NONEXTHOP;
1712 #endif
1713
1714 ip6_route_add(&cfg);
1715 }
1716
1717
1718 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
1719 int plen,
1720 const struct net_device *dev,
1721 u32 flags, u32 noflags)
1722 {
1723 struct fib6_node *fn;
1724 struct rt6_info *rt = NULL;
1725 struct fib6_table *table;
1726
1727 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX);
1728 if (table == NULL)
1729 return NULL;
1730
1731 write_lock_bh(&table->tb6_lock);
1732 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
1733 if (!fn)
1734 goto out;
1735 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1736 if (rt->rt6i_dev->ifindex != dev->ifindex)
1737 continue;
1738 if ((rt->rt6i_flags & flags) != flags)
1739 continue;
1740 if ((noflags != 0) && ((rt->rt6i_flags & flags) != 0))
1741 continue;
1742 dst_hold(&rt->dst);
1743 break;
1744 }
1745 out:
1746 write_unlock_bh(&table->tb6_lock);
1747 return rt;
1748 }
1749
1750
1751 /* Create "default" multicast route to the interface */
1752
1753 static void addrconf_add_mroute(struct net_device *dev)
1754 {
1755 struct fib6_config cfg = {
1756 .fc_table = RT6_TABLE_LOCAL,
1757 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1758 .fc_ifindex = dev->ifindex,
1759 .fc_dst_len = 8,
1760 .fc_flags = RTF_UP,
1761 .fc_nlinfo.nl_net = dev_net(dev),
1762 };
1763
1764 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1765
1766 ip6_route_add(&cfg);
1767 }
1768
1769 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1770 static void sit_route_add(struct net_device *dev)
1771 {
1772 struct fib6_config cfg = {
1773 .fc_table = RT6_TABLE_MAIN,
1774 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1775 .fc_ifindex = dev->ifindex,
1776 .fc_dst_len = 96,
1777 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1778 .fc_nlinfo.nl_net = dev_net(dev),
1779 };
1780
1781 /* prefix length - 96 bits "::d.d.d.d" */
1782 ip6_route_add(&cfg);
1783 }
1784 #endif
1785
1786 static void addrconf_add_lroute(struct net_device *dev)
1787 {
1788 struct in6_addr addr;
1789
1790 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1791 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1792 }
1793
1794 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1795 {
1796 struct inet6_dev *idev;
1797
1798 ASSERT_RTNL();
1799
1800 idev = ipv6_find_idev(dev);
1801 if (!idev)
1802 return ERR_PTR(-ENOBUFS);
1803
1804 if (idev->cnf.disable_ipv6)
1805 return ERR_PTR(-EACCES);
1806
1807 /* Add default multicast route */
1808 addrconf_add_mroute(dev);
1809
1810 /* Add link local route */
1811 addrconf_add_lroute(dev);
1812 return idev;
1813 }
1814
1815 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1816 {
1817 struct prefix_info *pinfo;
1818 __u32 valid_lft;
1819 __u32 prefered_lft;
1820 int addr_type;
1821 struct inet6_dev *in6_dev;
1822 struct net *net = dev_net(dev);
1823
1824 pinfo = (struct prefix_info *) opt;
1825
1826 if (len < sizeof(struct prefix_info)) {
1827 ADBG(("addrconf: prefix option too short\n"));
1828 return;
1829 }
1830
1831 /*
1832 * Validation checks ([ADDRCONF], page 19)
1833 */
1834
1835 addr_type = ipv6_addr_type(&pinfo->prefix);
1836
1837 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1838 return;
1839
1840 valid_lft = ntohl(pinfo->valid);
1841 prefered_lft = ntohl(pinfo->prefered);
1842
1843 if (prefered_lft > valid_lft) {
1844 if (net_ratelimit())
1845 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1846 return;
1847 }
1848
1849 in6_dev = in6_dev_get(dev);
1850
1851 if (in6_dev == NULL) {
1852 if (net_ratelimit())
1853 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1854 return;
1855 }
1856
1857 /*
1858 * Two things going on here:
1859 * 1) Add routes for on-link prefixes
1860 * 2) Configure prefixes with the auto flag set
1861 */
1862
1863 if (pinfo->onlink) {
1864 struct rt6_info *rt;
1865 unsigned long rt_expires;
1866
1867 /* Avoid arithmetic overflow. Really, we could
1868 * save rt_expires in seconds, likely valid_lft,
1869 * but it would require division in fib gc, that it
1870 * not good.
1871 */
1872 if (HZ > USER_HZ)
1873 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
1874 else
1875 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
1876
1877 if (addrconf_finite_timeout(rt_expires))
1878 rt_expires *= HZ;
1879
1880 rt = addrconf_get_prefix_route(&pinfo->prefix,
1881 pinfo->prefix_len,
1882 dev,
1883 RTF_ADDRCONF | RTF_PREFIX_RT,
1884 RTF_GATEWAY | RTF_DEFAULT);
1885
1886 if (rt) {
1887 /* Autoconf prefix route */
1888 if (valid_lft == 0) {
1889 ip6_del_rt(rt);
1890 rt = NULL;
1891 } else if (addrconf_finite_timeout(rt_expires)) {
1892 /* not infinity */
1893 rt->rt6i_expires = jiffies + rt_expires;
1894 rt->rt6i_flags |= RTF_EXPIRES;
1895 } else {
1896 rt->rt6i_flags &= ~RTF_EXPIRES;
1897 rt->rt6i_expires = 0;
1898 }
1899 } else if (valid_lft) {
1900 clock_t expires = 0;
1901 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
1902 if (addrconf_finite_timeout(rt_expires)) {
1903 /* not infinity */
1904 flags |= RTF_EXPIRES;
1905 expires = jiffies_to_clock_t(rt_expires);
1906 }
1907 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1908 dev, expires, flags);
1909 }
1910 if (rt)
1911 dst_release(&rt->dst);
1912 }
1913
1914 /* Try to figure out our local address for this prefix */
1915
1916 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1917 struct inet6_ifaddr * ifp;
1918 struct in6_addr addr;
1919 int create = 0, update_lft = 0;
1920
1921 if (pinfo->prefix_len == 64) {
1922 memcpy(&addr, &pinfo->prefix, 8);
1923 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1924 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1925 in6_dev_put(in6_dev);
1926 return;
1927 }
1928 goto ok;
1929 }
1930 if (net_ratelimit())
1931 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1932 pinfo->prefix_len);
1933 in6_dev_put(in6_dev);
1934 return;
1935
1936 ok:
1937
1938 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1939
1940 if (ifp == NULL && valid_lft) {
1941 int max_addresses = in6_dev->cnf.max_addresses;
1942 u32 addr_flags = 0;
1943
1944 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1945 if (in6_dev->cnf.optimistic_dad &&
1946 !net->ipv6.devconf_all->forwarding)
1947 addr_flags = IFA_F_OPTIMISTIC;
1948 #endif
1949
1950 /* Do not allow to create too much of autoconfigured
1951 * addresses; this would be too easy way to crash kernel.
1952 */
1953 if (!max_addresses ||
1954 ipv6_count_addresses(in6_dev) < max_addresses)
1955 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1956 addr_type&IPV6_ADDR_SCOPE_MASK,
1957 addr_flags);
1958
1959 if (!ifp || IS_ERR(ifp)) {
1960 in6_dev_put(in6_dev);
1961 return;
1962 }
1963
1964 update_lft = create = 1;
1965 ifp->cstamp = jiffies;
1966 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1967 }
1968
1969 if (ifp) {
1970 int flags;
1971 unsigned long now;
1972 #ifdef CONFIG_IPV6_PRIVACY
1973 struct inet6_ifaddr *ift;
1974 #endif
1975 u32 stored_lft;
1976
1977 /* update lifetime (RFC2462 5.5.3 e) */
1978 spin_lock(&ifp->lock);
1979 now = jiffies;
1980 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1981 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1982 else
1983 stored_lft = 0;
1984 if (!update_lft && stored_lft) {
1985 if (valid_lft > MIN_VALID_LIFETIME ||
1986 valid_lft > stored_lft)
1987 update_lft = 1;
1988 else if (stored_lft <= MIN_VALID_LIFETIME) {
1989 /* valid_lft <= stored_lft is always true */
1990 /*
1991 * RFC 4862 Section 5.5.3e:
1992 * "Note that the preferred lifetime of
1993 * the corresponding address is always
1994 * reset to the Preferred Lifetime in
1995 * the received Prefix Information
1996 * option, regardless of whether the
1997 * valid lifetime is also reset or
1998 * ignored."
1999 *
2000 * So if the preferred lifetime in
2001 * this advertisement is different
2002 * than what we have stored, but the
2003 * valid lifetime is invalid, just
2004 * reset prefered_lft.
2005 *
2006 * We must set the valid lifetime
2007 * to the stored lifetime since we'll
2008 * be updating the timestamp below,
2009 * else we'll set it back to the
2010 * minimum.
2011 */
2012 if (prefered_lft != ifp->prefered_lft) {
2013 valid_lft = stored_lft;
2014 update_lft = 1;
2015 }
2016 } else {
2017 valid_lft = MIN_VALID_LIFETIME;
2018 if (valid_lft < prefered_lft)
2019 prefered_lft = valid_lft;
2020 update_lft = 1;
2021 }
2022 }
2023
2024 if (update_lft) {
2025 ifp->valid_lft = valid_lft;
2026 ifp->prefered_lft = prefered_lft;
2027 ifp->tstamp = now;
2028 flags = ifp->flags;
2029 ifp->flags &= ~IFA_F_DEPRECATED;
2030 spin_unlock(&ifp->lock);
2031
2032 if (!(flags&IFA_F_TENTATIVE))
2033 ipv6_ifa_notify(0, ifp);
2034 } else
2035 spin_unlock(&ifp->lock);
2036
2037 #ifdef CONFIG_IPV6_PRIVACY
2038 read_lock_bh(&in6_dev->lock);
2039 /* update all temporary addresses in the list */
2040 list_for_each_entry(ift, &in6_dev->tempaddr_list,
2041 tmp_list) {
2042 int age, max_valid, max_prefered;
2043
2044 if (ifp != ift->ifpub)
2045 continue;
2046
2047 /*
2048 * RFC 4941 section 3.3:
2049 * If a received option will extend the lifetime
2050 * of a public address, the lifetimes of
2051 * temporary addresses should be extended,
2052 * subject to the overall constraint that no
2053 * temporary addresses should ever remain
2054 * "valid" or "preferred" for a time longer than
2055 * (TEMP_VALID_LIFETIME) or
2056 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR),
2057 * respectively.
2058 */
2059 age = (now - ift->cstamp) / HZ;
2060 max_valid = in6_dev->cnf.temp_valid_lft - age;
2061 if (max_valid < 0)
2062 max_valid = 0;
2063
2064 max_prefered = in6_dev->cnf.temp_prefered_lft -
2065 in6_dev->cnf.max_desync_factor -
2066 age;
2067 if (max_prefered < 0)
2068 max_prefered = 0;
2069
2070 if (valid_lft > max_valid)
2071 valid_lft = max_valid;
2072
2073 if (prefered_lft > max_prefered)
2074 prefered_lft = max_prefered;
2075
2076 spin_lock(&ift->lock);
2077 flags = ift->flags;
2078 ift->valid_lft = valid_lft;
2079 ift->prefered_lft = prefered_lft;
2080 ift->tstamp = now;
2081 if (prefered_lft > 0)
2082 ift->flags &= ~IFA_F_DEPRECATED;
2083
2084 spin_unlock(&ift->lock);
2085 if (!(flags&IFA_F_TENTATIVE))
2086 ipv6_ifa_notify(0, ift);
2087 }
2088
2089 if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) {
2090 /*
2091 * When a new public address is created as
2092 * described in [ADDRCONF], also create a new
2093 * temporary address. Also create a temporary
2094 * address if it's enabled but no temporary
2095 * address currently exists.
2096 */
2097 read_unlock_bh(&in6_dev->lock);
2098 ipv6_create_tempaddr(ifp, NULL);
2099 } else {
2100 read_unlock_bh(&in6_dev->lock);
2101 }
2102 #endif
2103 in6_ifa_put(ifp);
2104 addrconf_verify(0);
2105 }
2106 }
2107 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2108 in6_dev_put(in6_dev);
2109 }
2110
2111 /*
2112 * Set destination address.
2113 * Special case for SIT interfaces where we create a new "virtual"
2114 * device.
2115 */
2116 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2117 {
2118 struct in6_ifreq ireq;
2119 struct net_device *dev;
2120 int err = -EINVAL;
2121
2122 rtnl_lock();
2123
2124 err = -EFAULT;
2125 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2126 goto err_exit;
2127
2128 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2129
2130 err = -ENODEV;
2131 if (dev == NULL)
2132 goto err_exit;
2133
2134 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2135 if (dev->type == ARPHRD_SIT) {
2136 const struct net_device_ops *ops = dev->netdev_ops;
2137 struct ifreq ifr;
2138 struct ip_tunnel_parm p;
2139
2140 err = -EADDRNOTAVAIL;
2141 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2142 goto err_exit;
2143
2144 memset(&p, 0, sizeof(p));
2145 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2146 p.iph.saddr = 0;
2147 p.iph.version = 4;
2148 p.iph.ihl = 5;
2149 p.iph.protocol = IPPROTO_IPV6;
2150 p.iph.ttl = 64;
2151 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2152
2153 if (ops->ndo_do_ioctl) {
2154 mm_segment_t oldfs = get_fs();
2155
2156 set_fs(KERNEL_DS);
2157 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2158 set_fs(oldfs);
2159 } else
2160 err = -EOPNOTSUPP;
2161
2162 if (err == 0) {
2163 err = -ENOBUFS;
2164 dev = __dev_get_by_name(net, p.name);
2165 if (!dev)
2166 goto err_exit;
2167 err = dev_open(dev);
2168 }
2169 }
2170 #endif
2171
2172 err_exit:
2173 rtnl_unlock();
2174 return err;
2175 }
2176
2177 /*
2178 * Manual configuration of address on an interface
2179 */
2180 static int inet6_addr_add(struct net *net, int ifindex, const struct in6_addr *pfx,
2181 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
2182 __u32 valid_lft)
2183 {
2184 struct inet6_ifaddr *ifp;
2185 struct inet6_dev *idev;
2186 struct net_device *dev;
2187 int scope;
2188 u32 flags;
2189 clock_t expires;
2190 unsigned long timeout;
2191
2192 ASSERT_RTNL();
2193
2194 if (plen > 128)
2195 return -EINVAL;
2196
2197 /* check the lifetime */
2198 if (!valid_lft || prefered_lft > valid_lft)
2199 return -EINVAL;
2200
2201 dev = __dev_get_by_index(net, ifindex);
2202 if (!dev)
2203 return -ENODEV;
2204
2205 idev = addrconf_add_dev(dev);
2206 if (IS_ERR(idev))
2207 return PTR_ERR(idev);
2208
2209 scope = ipv6_addr_scope(pfx);
2210
2211 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2212 if (addrconf_finite_timeout(timeout)) {
2213 expires = jiffies_to_clock_t(timeout * HZ);
2214 valid_lft = timeout;
2215 flags = RTF_EXPIRES;
2216 } else {
2217 expires = 0;
2218 flags = 0;
2219 ifa_flags |= IFA_F_PERMANENT;
2220 }
2221
2222 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2223 if (addrconf_finite_timeout(timeout)) {
2224 if (timeout == 0)
2225 ifa_flags |= IFA_F_DEPRECATED;
2226 prefered_lft = timeout;
2227 }
2228
2229 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2230
2231 if (!IS_ERR(ifp)) {
2232 spin_lock_bh(&ifp->lock);
2233 ifp->valid_lft = valid_lft;
2234 ifp->prefered_lft = prefered_lft;
2235 ifp->tstamp = jiffies;
2236 spin_unlock_bh(&ifp->lock);
2237
2238 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2239 expires, flags);
2240 /*
2241 * Note that section 3.1 of RFC 4429 indicates
2242 * that the Optimistic flag should not be set for
2243 * manually configured addresses
2244 */
2245 addrconf_dad_start(ifp, 0);
2246 in6_ifa_put(ifp);
2247 addrconf_verify(0);
2248 return 0;
2249 }
2250
2251 return PTR_ERR(ifp);
2252 }
2253
2254 static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx,
2255 unsigned int plen)
2256 {
2257 struct inet6_ifaddr *ifp;
2258 struct inet6_dev *idev;
2259 struct net_device *dev;
2260
2261 if (plen > 128)
2262 return -EINVAL;
2263
2264 dev = __dev_get_by_index(net, ifindex);
2265 if (!dev)
2266 return -ENODEV;
2267
2268 if ((idev = __in6_dev_get(dev)) == NULL)
2269 return -ENXIO;
2270
2271 read_lock_bh(&idev->lock);
2272 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2273 if (ifp->prefix_len == plen &&
2274 ipv6_addr_equal(pfx, &ifp->addr)) {
2275 in6_ifa_hold(ifp);
2276 read_unlock_bh(&idev->lock);
2277
2278 ipv6_del_addr(ifp);
2279
2280 /* If the last address is deleted administratively,
2281 disable IPv6 on this interface.
2282 */
2283 if (list_empty(&idev->addr_list))
2284 addrconf_ifdown(idev->dev, 1);
2285 return 0;
2286 }
2287 }
2288 read_unlock_bh(&idev->lock);
2289 return -EADDRNOTAVAIL;
2290 }
2291
2292
2293 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2294 {
2295 struct in6_ifreq ireq;
2296 int err;
2297
2298 if (!capable(CAP_NET_ADMIN))
2299 return -EPERM;
2300
2301 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2302 return -EFAULT;
2303
2304 rtnl_lock();
2305 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2306 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2307 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2308 rtnl_unlock();
2309 return err;
2310 }
2311
2312 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2313 {
2314 struct in6_ifreq ireq;
2315 int err;
2316
2317 if (!capable(CAP_NET_ADMIN))
2318 return -EPERM;
2319
2320 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2321 return -EFAULT;
2322
2323 rtnl_lock();
2324 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2325 ireq.ifr6_prefixlen);
2326 rtnl_unlock();
2327 return err;
2328 }
2329
2330 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2331 int plen, int scope)
2332 {
2333 struct inet6_ifaddr *ifp;
2334
2335 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT);
2336 if (!IS_ERR(ifp)) {
2337 spin_lock_bh(&ifp->lock);
2338 ifp->flags &= ~IFA_F_TENTATIVE;
2339 spin_unlock_bh(&ifp->lock);
2340 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2341 in6_ifa_put(ifp);
2342 }
2343 }
2344
2345 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2346 static void sit_add_v4_addrs(struct inet6_dev *idev)
2347 {
2348 struct in6_addr addr;
2349 struct net_device *dev;
2350 struct net *net = dev_net(idev->dev);
2351 int scope;
2352
2353 ASSERT_RTNL();
2354
2355 memset(&addr, 0, sizeof(struct in6_addr));
2356 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2357
2358 if (idev->dev->flags&IFF_POINTOPOINT) {
2359 addr.s6_addr32[0] = htonl(0xfe800000);
2360 scope = IFA_LINK;
2361 } else {
2362 scope = IPV6_ADDR_COMPATv4;
2363 }
2364
2365 if (addr.s6_addr32[3]) {
2366 add_addr(idev, &addr, 128, scope);
2367 return;
2368 }
2369
2370 for_each_netdev(net, dev) {
2371 struct in_device * in_dev = __in_dev_get_rtnl(dev);
2372 if (in_dev && (dev->flags & IFF_UP)) {
2373 struct in_ifaddr * ifa;
2374
2375 int flag = scope;
2376
2377 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2378 int plen;
2379
2380 addr.s6_addr32[3] = ifa->ifa_local;
2381
2382 if (ifa->ifa_scope == RT_SCOPE_LINK)
2383 continue;
2384 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2385 if (idev->dev->flags&IFF_POINTOPOINT)
2386 continue;
2387 flag |= IFA_HOST;
2388 }
2389 if (idev->dev->flags&IFF_POINTOPOINT)
2390 plen = 64;
2391 else
2392 plen = 96;
2393
2394 add_addr(idev, &addr, plen, flag);
2395 }
2396 }
2397 }
2398 }
2399 #endif
2400
2401 static void init_loopback(struct net_device *dev)
2402 {
2403 struct inet6_dev *idev;
2404
2405 /* ::1 */
2406
2407 ASSERT_RTNL();
2408
2409 if ((idev = ipv6_find_idev(dev)) == NULL) {
2410 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2411 return;
2412 }
2413
2414 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2415 }
2416
2417 static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr)
2418 {
2419 struct inet6_ifaddr * ifp;
2420 u32 addr_flags = IFA_F_PERMANENT;
2421
2422 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2423 if (idev->cnf.optimistic_dad &&
2424 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2425 addr_flags |= IFA_F_OPTIMISTIC;
2426 #endif
2427
2428
2429 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2430 if (!IS_ERR(ifp)) {
2431 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2432 addrconf_dad_start(ifp, 0);
2433 in6_ifa_put(ifp);
2434 }
2435 }
2436
2437 static void addrconf_dev_config(struct net_device *dev)
2438 {
2439 struct in6_addr addr;
2440 struct inet6_dev * idev;
2441
2442 ASSERT_RTNL();
2443
2444 if ((dev->type != ARPHRD_ETHER) &&
2445 (dev->type != ARPHRD_FDDI) &&
2446 (dev->type != ARPHRD_IEEE802_TR) &&
2447 (dev->type != ARPHRD_ARCNET) &&
2448 (dev->type != ARPHRD_INFINIBAND)) {
2449 /* Alas, we support only Ethernet autoconfiguration. */
2450 return;
2451 }
2452
2453 idev = addrconf_add_dev(dev);
2454 if (IS_ERR(idev))
2455 return;
2456
2457 memset(&addr, 0, sizeof(struct in6_addr));
2458 addr.s6_addr32[0] = htonl(0xFE800000);
2459
2460 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2461 addrconf_add_linklocal(idev, &addr);
2462 }
2463
2464 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2465 static void addrconf_sit_config(struct net_device *dev)
2466 {
2467 struct inet6_dev *idev;
2468
2469 ASSERT_RTNL();
2470
2471 /*
2472 * Configure the tunnel with one of our IPv4
2473 * addresses... we should configure all of
2474 * our v4 addrs in the tunnel
2475 */
2476
2477 if ((idev = ipv6_find_idev(dev)) == NULL) {
2478 printk(KERN_DEBUG "init sit: add_dev failed\n");
2479 return;
2480 }
2481
2482 if (dev->priv_flags & IFF_ISATAP) {
2483 struct in6_addr addr;
2484
2485 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2486 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2487 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2488 addrconf_add_linklocal(idev, &addr);
2489 return;
2490 }
2491
2492 sit_add_v4_addrs(idev);
2493
2494 if (dev->flags&IFF_POINTOPOINT) {
2495 addrconf_add_mroute(dev);
2496 addrconf_add_lroute(dev);
2497 } else
2498 sit_route_add(dev);
2499 }
2500 #endif
2501
2502 #if defined(CONFIG_NET_IPGRE) || defined(CONFIG_NET_IPGRE_MODULE)
2503 static void addrconf_gre_config(struct net_device *dev)
2504 {
2505 struct inet6_dev *idev;
2506 struct in6_addr addr;
2507
2508 pr_info("ipv6: addrconf_gre_config(%s)\n", dev->name);
2509
2510 ASSERT_RTNL();
2511
2512 if ((idev = ipv6_find_idev(dev)) == NULL) {
2513 printk(KERN_DEBUG "init gre: add_dev failed\n");
2514 return;
2515 }
2516
2517 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2518 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2519
2520 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2521 addrconf_add_linklocal(idev, &addr);
2522 }
2523 #endif
2524
2525 static inline int
2526 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2527 {
2528 struct in6_addr lladdr;
2529
2530 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2531 addrconf_add_linklocal(idev, &lladdr);
2532 return 0;
2533 }
2534 return -1;
2535 }
2536
2537 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2538 {
2539 struct net_device *link_dev;
2540 struct net *net = dev_net(idev->dev);
2541
2542 /* first try to inherit the link-local address from the link device */
2543 if (idev->dev->iflink &&
2544 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
2545 if (!ipv6_inherit_linklocal(idev, link_dev))
2546 return;
2547 }
2548 /* then try to inherit it from any device */
2549 for_each_netdev(net, link_dev) {
2550 if (!ipv6_inherit_linklocal(idev, link_dev))
2551 return;
2552 }
2553 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2554 }
2555
2556 /*
2557 * Autoconfigure tunnel with a link-local address so routing protocols,
2558 * DHCPv6, MLD etc. can be run over the virtual link
2559 */
2560
2561 static void addrconf_ip6_tnl_config(struct net_device *dev)
2562 {
2563 struct inet6_dev *idev;
2564
2565 ASSERT_RTNL();
2566
2567 idev = addrconf_add_dev(dev);
2568 if (IS_ERR(idev)) {
2569 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2570 return;
2571 }
2572 ip6_tnl_add_linklocal(idev);
2573 }
2574
2575 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2576 void * data)
2577 {
2578 struct net_device *dev = (struct net_device *) data;
2579 struct inet6_dev *idev = __in6_dev_get(dev);
2580 int run_pending = 0;
2581 int err;
2582
2583 switch (event) {
2584 case NETDEV_REGISTER:
2585 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2586 idev = ipv6_add_dev(dev);
2587 if (!idev)
2588 return notifier_from_errno(-ENOMEM);
2589 }
2590 break;
2591
2592 case NETDEV_UP:
2593 case NETDEV_CHANGE:
2594 if (dev->flags & IFF_SLAVE)
2595 break;
2596
2597 if (event == NETDEV_UP) {
2598 if (!addrconf_qdisc_ok(dev)) {
2599 /* device is not ready yet. */
2600 printk(KERN_INFO
2601 "ADDRCONF(NETDEV_UP): %s: "
2602 "link is not ready\n",
2603 dev->name);
2604 break;
2605 }
2606
2607 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2608 idev = ipv6_add_dev(dev);
2609
2610 if (idev) {
2611 idev->if_flags |= IF_READY;
2612 run_pending = 1;
2613 }
2614 } else {
2615 if (!addrconf_qdisc_ok(dev)) {
2616 /* device is still not ready. */
2617 break;
2618 }
2619
2620 if (idev) {
2621 if (idev->if_flags & IF_READY)
2622 /* device is already configured. */
2623 break;
2624 idev->if_flags |= IF_READY;
2625 }
2626
2627 printk(KERN_INFO
2628 "ADDRCONF(NETDEV_CHANGE): %s: "
2629 "link becomes ready\n",
2630 dev->name);
2631
2632 run_pending = 1;
2633 }
2634
2635 switch (dev->type) {
2636 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2637 case ARPHRD_SIT:
2638 addrconf_sit_config(dev);
2639 break;
2640 #endif
2641 #if defined(CONFIG_NET_IPGRE) || defined(CONFIG_NET_IPGRE_MODULE)
2642 case ARPHRD_IPGRE:
2643 addrconf_gre_config(dev);
2644 break;
2645 #endif
2646 case ARPHRD_TUNNEL6:
2647 addrconf_ip6_tnl_config(dev);
2648 break;
2649 case ARPHRD_LOOPBACK:
2650 init_loopback(dev);
2651 break;
2652
2653 default:
2654 addrconf_dev_config(dev);
2655 break;
2656 }
2657
2658 if (idev) {
2659 if (run_pending)
2660 addrconf_dad_run(idev);
2661
2662 /*
2663 * If the MTU changed during the interface down,
2664 * when the interface up, the changed MTU must be
2665 * reflected in the idev as well as routers.
2666 */
2667 if (idev->cnf.mtu6 != dev->mtu &&
2668 dev->mtu >= IPV6_MIN_MTU) {
2669 rt6_mtu_change(dev, dev->mtu);
2670 idev->cnf.mtu6 = dev->mtu;
2671 }
2672 idev->tstamp = jiffies;
2673 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2674
2675 /*
2676 * If the changed mtu during down is lower than
2677 * IPV6_MIN_MTU stop IPv6 on this interface.
2678 */
2679 if (dev->mtu < IPV6_MIN_MTU)
2680 addrconf_ifdown(dev, 1);
2681 }
2682 break;
2683
2684 case NETDEV_CHANGEMTU:
2685 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2686 rt6_mtu_change(dev, dev->mtu);
2687 idev->cnf.mtu6 = dev->mtu;
2688 break;
2689 }
2690
2691 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2692 idev = ipv6_add_dev(dev);
2693 if (idev)
2694 break;
2695 }
2696
2697 /*
2698 * MTU falled under IPV6_MIN_MTU.
2699 * Stop IPv6 on this interface.
2700 */
2701
2702 case NETDEV_DOWN:
2703 case NETDEV_UNREGISTER:
2704 /*
2705 * Remove all addresses from this interface.
2706 */
2707 addrconf_ifdown(dev, event != NETDEV_DOWN);
2708 break;
2709
2710 case NETDEV_CHANGENAME:
2711 if (idev) {
2712 snmp6_unregister_dev(idev);
2713 addrconf_sysctl_unregister(idev);
2714 addrconf_sysctl_register(idev);
2715 err = snmp6_register_dev(idev);
2716 if (err)
2717 return notifier_from_errno(err);
2718 }
2719 break;
2720
2721 case NETDEV_PRE_TYPE_CHANGE:
2722 case NETDEV_POST_TYPE_CHANGE:
2723 addrconf_type_change(dev, event);
2724 break;
2725 }
2726
2727 return NOTIFY_OK;
2728 }
2729
2730 /*
2731 * addrconf module should be notified of a device going up
2732 */
2733 static struct notifier_block ipv6_dev_notf = {
2734 .notifier_call = addrconf_notify,
2735 };
2736
2737 static void addrconf_type_change(struct net_device *dev, unsigned long event)
2738 {
2739 struct inet6_dev *idev;
2740 ASSERT_RTNL();
2741
2742 idev = __in6_dev_get(dev);
2743
2744 if (event == NETDEV_POST_TYPE_CHANGE)
2745 ipv6_mc_remap(idev);
2746 else if (event == NETDEV_PRE_TYPE_CHANGE)
2747 ipv6_mc_unmap(idev);
2748 }
2749
2750 static int addrconf_ifdown(struct net_device *dev, int how)
2751 {
2752 struct net *net = dev_net(dev);
2753 struct inet6_dev *idev;
2754 struct inet6_ifaddr *ifa;
2755 int state, i;
2756
2757 ASSERT_RTNL();
2758
2759 rt6_ifdown(net, dev);
2760 neigh_ifdown(&nd_tbl, dev);
2761
2762 idev = __in6_dev_get(dev);
2763 if (idev == NULL)
2764 return -ENODEV;
2765
2766 /*
2767 * Step 1: remove reference to ipv6 device from parent device.
2768 * Do not dev_put!
2769 */
2770 if (how) {
2771 idev->dead = 1;
2772
2773 /* protected by rtnl_lock */
2774 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
2775
2776 /* Step 1.5: remove snmp6 entry */
2777 snmp6_unregister_dev(idev);
2778
2779 }
2780
2781 /* Step 2: clear hash table */
2782 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
2783 struct hlist_head *h = &inet6_addr_lst[i];
2784 struct hlist_node *n;
2785
2786 spin_lock_bh(&addrconf_hash_lock);
2787 restart:
2788 hlist_for_each_entry_rcu(ifa, n, h, addr_lst) {
2789 if (ifa->idev == idev) {
2790 hlist_del_init_rcu(&ifa->addr_lst);
2791 addrconf_del_timer(ifa);
2792 goto restart;
2793 }
2794 }
2795 spin_unlock_bh(&addrconf_hash_lock);
2796 }
2797
2798 write_lock_bh(&idev->lock);
2799
2800 /* Step 2: clear flags for stateless addrconf */
2801 if (!how)
2802 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2803
2804 #ifdef CONFIG_IPV6_PRIVACY
2805 if (how && del_timer(&idev->regen_timer))
2806 in6_dev_put(idev);
2807
2808 /* Step 3: clear tempaddr list */
2809 while (!list_empty(&idev->tempaddr_list)) {
2810 ifa = list_first_entry(&idev->tempaddr_list,
2811 struct inet6_ifaddr, tmp_list);
2812 list_del(&ifa->tmp_list);
2813 write_unlock_bh(&idev->lock);
2814 spin_lock_bh(&ifa->lock);
2815
2816 if (ifa->ifpub) {
2817 in6_ifa_put(ifa->ifpub);
2818 ifa->ifpub = NULL;
2819 }
2820 spin_unlock_bh(&ifa->lock);
2821 in6_ifa_put(ifa);
2822 write_lock_bh(&idev->lock);
2823 }
2824 #endif
2825
2826 while (!list_empty(&idev->addr_list)) {
2827 ifa = list_first_entry(&idev->addr_list,
2828 struct inet6_ifaddr, if_list);
2829 addrconf_del_timer(ifa);
2830
2831 list_del(&ifa->if_list);
2832
2833 write_unlock_bh(&idev->lock);
2834
2835 spin_lock_bh(&ifa->state_lock);
2836 state = ifa->state;
2837 ifa->state = INET6_IFADDR_STATE_DEAD;
2838 spin_unlock_bh(&ifa->state_lock);
2839
2840 if (state != INET6_IFADDR_STATE_DEAD) {
2841 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2842 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2843 }
2844 in6_ifa_put(ifa);
2845
2846 write_lock_bh(&idev->lock);
2847 }
2848
2849 write_unlock_bh(&idev->lock);
2850
2851 /* Step 5: Discard multicast list */
2852 if (how)
2853 ipv6_mc_destroy_dev(idev);
2854 else
2855 ipv6_mc_down(idev);
2856
2857 idev->tstamp = jiffies;
2858
2859 /* Last: Shot the device (if unregistered) */
2860 if (how) {
2861 addrconf_sysctl_unregister(idev);
2862 neigh_parms_release(&nd_tbl, idev->nd_parms);
2863 neigh_ifdown(&nd_tbl, dev);
2864 in6_dev_put(idev);
2865 }
2866 return 0;
2867 }
2868
2869 static void addrconf_rs_timer(unsigned long data)
2870 {
2871 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2872 struct inet6_dev *idev = ifp->idev;
2873
2874 read_lock(&idev->lock);
2875 if (idev->dead || !(idev->if_flags & IF_READY))
2876 goto out;
2877
2878 if (idev->cnf.forwarding)
2879 goto out;
2880
2881 /* Announcement received after solicitation was sent */
2882 if (idev->if_flags & IF_RA_RCVD)
2883 goto out;
2884
2885 spin_lock(&ifp->lock);
2886 if (ifp->probes++ < idev->cnf.rtr_solicits) {
2887 /* The wait after the last probe can be shorter */
2888 addrconf_mod_timer(ifp, AC_RS,
2889 (ifp->probes == idev->cnf.rtr_solicits) ?
2890 idev->cnf.rtr_solicit_delay :
2891 idev->cnf.rtr_solicit_interval);
2892 spin_unlock(&ifp->lock);
2893
2894 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2895 } else {
2896 spin_unlock(&ifp->lock);
2897 /*
2898 * Note: we do not support deprecated "all on-link"
2899 * assumption any longer.
2900 */
2901 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2902 idev->dev->name);
2903 }
2904
2905 out:
2906 read_unlock(&idev->lock);
2907 in6_ifa_put(ifp);
2908 }
2909
2910 /*
2911 * Duplicate Address Detection
2912 */
2913 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2914 {
2915 unsigned long rand_num;
2916 struct inet6_dev *idev = ifp->idev;
2917
2918 if (ifp->flags & IFA_F_OPTIMISTIC)
2919 rand_num = 0;
2920 else
2921 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2922
2923 ifp->probes = idev->cnf.dad_transmits;
2924 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2925 }
2926
2927 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2928 {
2929 struct inet6_dev *idev = ifp->idev;
2930 struct net_device *dev = idev->dev;
2931
2932 addrconf_join_solict(dev, &ifp->addr);
2933
2934 net_srandom(ifp->addr.s6_addr32[3]);
2935
2936 read_lock_bh(&idev->lock);
2937 spin_lock(&ifp->lock);
2938 if (ifp->state == INET6_IFADDR_STATE_DEAD)
2939 goto out;
2940
2941 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2942 idev->cnf.accept_dad < 1 ||
2943 !(ifp->flags&IFA_F_TENTATIVE) ||
2944 ifp->flags & IFA_F_NODAD) {
2945 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
2946 spin_unlock(&ifp->lock);
2947 read_unlock_bh(&idev->lock);
2948
2949 addrconf_dad_completed(ifp);
2950 return;
2951 }
2952
2953 if (!(idev->if_flags & IF_READY)) {
2954 spin_unlock(&ifp->lock);
2955 read_unlock_bh(&idev->lock);
2956 /*
2957 * If the device is not ready:
2958 * - keep it tentative if it is a permanent address.
2959 * - otherwise, kill it.
2960 */
2961 in6_ifa_hold(ifp);
2962 addrconf_dad_stop(ifp, 0);
2963 return;
2964 }
2965
2966 /*
2967 * Optimistic nodes can start receiving
2968 * Frames right away
2969 */
2970 if (ifp->flags & IFA_F_OPTIMISTIC)
2971 ip6_ins_rt(ifp->rt);
2972
2973 addrconf_dad_kick(ifp);
2974 out:
2975 spin_unlock(&ifp->lock);
2976 read_unlock_bh(&idev->lock);
2977 }
2978
2979 static void addrconf_dad_timer(unsigned long data)
2980 {
2981 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2982 struct inet6_dev *idev = ifp->idev;
2983 struct in6_addr mcaddr;
2984
2985 if (!ifp->probes && addrconf_dad_end(ifp))
2986 goto out;
2987
2988 read_lock(&idev->lock);
2989 if (idev->dead || !(idev->if_flags & IF_READY)) {
2990 read_unlock(&idev->lock);
2991 goto out;
2992 }
2993
2994 spin_lock(&ifp->lock);
2995 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
2996 spin_unlock(&ifp->lock);
2997 read_unlock(&idev->lock);
2998 goto out;
2999 }
3000
3001 if (ifp->probes == 0) {
3002 /*
3003 * DAD was successful
3004 */
3005
3006 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3007 spin_unlock(&ifp->lock);
3008 read_unlock(&idev->lock);
3009
3010 addrconf_dad_completed(ifp);
3011
3012 goto out;
3013 }
3014
3015 ifp->probes--;
3016 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
3017 spin_unlock(&ifp->lock);
3018 read_unlock(&idev->lock);
3019
3020 /* send a neighbour solicitation for our addr */
3021 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3022 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
3023 out:
3024 in6_ifa_put(ifp);
3025 }
3026
3027 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3028 {
3029 struct net_device *dev = ifp->idev->dev;
3030
3031 /*
3032 * Configure the address for reception. Now it is valid.
3033 */
3034
3035 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3036
3037 /* If added prefix is link local and we are prepared to process
3038 router advertisements, start sending router solicitations.
3039 */
3040
3041 if (((ifp->idev->cnf.accept_ra == 1 && !ifp->idev->cnf.forwarding) ||
3042 ifp->idev->cnf.accept_ra == 2) &&
3043 ifp->idev->cnf.rtr_solicits > 0 &&
3044 (dev->flags&IFF_LOOPBACK) == 0 &&
3045 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
3046 /*
3047 * If a host as already performed a random delay
3048 * [...] as part of DAD [...] there is no need
3049 * to delay again before sending the first RS
3050 */
3051 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
3052
3053 spin_lock_bh(&ifp->lock);
3054 ifp->probes = 1;
3055 ifp->idev->if_flags |= IF_RS_SENT;
3056 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
3057 spin_unlock_bh(&ifp->lock);
3058 }
3059 }
3060
3061 static void addrconf_dad_run(struct inet6_dev *idev)
3062 {
3063 struct inet6_ifaddr *ifp;
3064
3065 read_lock_bh(&idev->lock);
3066 list_for_each_entry(ifp, &idev->addr_list, if_list) {
3067 spin_lock(&ifp->lock);
3068 if (ifp->flags & IFA_F_TENTATIVE &&
3069 ifp->state == INET6_IFADDR_STATE_DAD)
3070 addrconf_dad_kick(ifp);
3071 spin_unlock(&ifp->lock);
3072 }
3073 read_unlock_bh(&idev->lock);
3074 }
3075
3076 #ifdef CONFIG_PROC_FS
3077 struct if6_iter_state {
3078 struct seq_net_private p;
3079 int bucket;
3080 };
3081
3082 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
3083 {
3084 struct inet6_ifaddr *ifa = NULL;
3085 struct if6_iter_state *state = seq->private;
3086 struct net *net = seq_file_net(seq);
3087
3088 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3089 struct hlist_node *n;
3090 hlist_for_each_entry_rcu_bh(ifa, n, &inet6_addr_lst[state->bucket],
3091 addr_lst)
3092 if (net_eq(dev_net(ifa->idev->dev), net))
3093 return ifa;
3094 }
3095 return NULL;
3096 }
3097
3098 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3099 struct inet6_ifaddr *ifa)
3100 {
3101 struct if6_iter_state *state = seq->private;
3102 struct net *net = seq_file_net(seq);
3103 struct hlist_node *n = &ifa->addr_lst;
3104
3105 hlist_for_each_entry_continue_rcu_bh(ifa, n, addr_lst)
3106 if (net_eq(dev_net(ifa->idev->dev), net))
3107 return ifa;
3108
3109 while (++state->bucket < IN6_ADDR_HSIZE) {
3110 hlist_for_each_entry_rcu_bh(ifa, n,
3111 &inet6_addr_lst[state->bucket], addr_lst) {
3112 if (net_eq(dev_net(ifa->idev->dev), net))
3113 return ifa;
3114 }
3115 }
3116
3117 return NULL;
3118 }
3119
3120 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
3121 {
3122 struct inet6_ifaddr *ifa = if6_get_first(seq);
3123
3124 if (ifa)
3125 while (pos && (ifa = if6_get_next(seq, ifa)) != NULL)
3126 --pos;
3127 return pos ? NULL : ifa;
3128 }
3129
3130 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3131 __acquires(rcu_bh)
3132 {
3133 rcu_read_lock_bh();
3134 return if6_get_idx(seq, *pos);
3135 }
3136
3137 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3138 {
3139 struct inet6_ifaddr *ifa;
3140
3141 ifa = if6_get_next(seq, v);
3142 ++*pos;
3143 return ifa;
3144 }
3145
3146 static void if6_seq_stop(struct seq_file *seq, void *v)
3147 __releases(rcu_bh)
3148 {
3149 rcu_read_unlock_bh();
3150 }
3151
3152 static int if6_seq_show(struct seq_file *seq, void *v)
3153 {
3154 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3155 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3156 &ifp->addr,
3157 ifp->idev->dev->ifindex,
3158 ifp->prefix_len,
3159 ifp->scope,
3160 ifp->flags,
3161 ifp->idev->dev->name);
3162 return 0;
3163 }
3164
3165 static const struct seq_operations if6_seq_ops = {
3166 .start = if6_seq_start,
3167 .next = if6_seq_next,
3168 .show = if6_seq_show,
3169 .stop = if6_seq_stop,
3170 };
3171
3172 static int if6_seq_open(struct inode *inode, struct file *file)
3173 {
3174 return seq_open_net(inode, file, &if6_seq_ops,
3175 sizeof(struct if6_iter_state));
3176 }
3177
3178 static const struct file_operations if6_fops = {
3179 .owner = THIS_MODULE,
3180 .open = if6_seq_open,
3181 .read = seq_read,
3182 .llseek = seq_lseek,
3183 .release = seq_release_net,
3184 };
3185
3186 static int __net_init if6_proc_net_init(struct net *net)
3187 {
3188 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
3189 return -ENOMEM;
3190 return 0;
3191 }
3192
3193 static void __net_exit if6_proc_net_exit(struct net *net)
3194 {
3195 proc_net_remove(net, "if_inet6");
3196 }
3197
3198 static struct pernet_operations if6_proc_net_ops = {
3199 .init = if6_proc_net_init,
3200 .exit = if6_proc_net_exit,
3201 };
3202
3203 int __init if6_proc_init(void)
3204 {
3205 return register_pernet_subsys(&if6_proc_net_ops);
3206 }
3207
3208 void if6_proc_exit(void)
3209 {
3210 unregister_pernet_subsys(&if6_proc_net_ops);
3211 }
3212 #endif /* CONFIG_PROC_FS */
3213
3214 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3215 /* Check if address is a home address configured on any interface. */
3216 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3217 {
3218 int ret = 0;
3219 struct inet6_ifaddr *ifp = NULL;
3220 struct hlist_node *n;
3221 unsigned int hash = ipv6_addr_hash(addr);
3222
3223 rcu_read_lock_bh();
3224 hlist_for_each_entry_rcu_bh(ifp, n, &inet6_addr_lst[hash], addr_lst) {
3225 if (!net_eq(dev_net(ifp->idev->dev), net))
3226 continue;
3227 if (ipv6_addr_equal(&ifp->addr, addr) &&
3228 (ifp->flags & IFA_F_HOMEADDRESS)) {
3229 ret = 1;
3230 break;
3231 }
3232 }
3233 rcu_read_unlock_bh();
3234 return ret;
3235 }
3236 #endif
3237
3238 /*
3239 * Periodic address status verification
3240 */
3241
3242 static void addrconf_verify(unsigned long foo)
3243 {
3244 unsigned long now, next, next_sec, next_sched;
3245 struct inet6_ifaddr *ifp;
3246 struct hlist_node *node;
3247 int i;
3248
3249 rcu_read_lock_bh();
3250 spin_lock(&addrconf_verify_lock);
3251 now = jiffies;
3252 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3253
3254 del_timer(&addr_chk_timer);
3255
3256 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3257 restart:
3258 hlist_for_each_entry_rcu_bh(ifp, node,
3259 &inet6_addr_lst[i], addr_lst) {
3260 unsigned long age;
3261
3262 if (ifp->flags & IFA_F_PERMANENT)
3263 continue;
3264
3265 spin_lock(&ifp->lock);
3266 /* We try to batch several events at once. */
3267 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3268
3269 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3270 age >= ifp->valid_lft) {
3271 spin_unlock(&ifp->lock);
3272 in6_ifa_hold(ifp);
3273 ipv6_del_addr(ifp);
3274 goto restart;
3275 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3276 spin_unlock(&ifp->lock);
3277 continue;
3278 } else if (age >= ifp->prefered_lft) {
3279 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3280 int deprecate = 0;
3281
3282 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3283 deprecate = 1;
3284 ifp->flags |= IFA_F_DEPRECATED;
3285 }
3286
3287 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3288 next = ifp->tstamp + ifp->valid_lft * HZ;
3289
3290 spin_unlock(&ifp->lock);
3291
3292 if (deprecate) {
3293 in6_ifa_hold(ifp);
3294
3295 ipv6_ifa_notify(0, ifp);
3296 in6_ifa_put(ifp);
3297 goto restart;
3298 }
3299 #ifdef CONFIG_IPV6_PRIVACY
3300 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3301 !(ifp->flags&IFA_F_TENTATIVE)) {
3302 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3303 ifp->idev->cnf.dad_transmits *
3304 ifp->idev->nd_parms->retrans_time / HZ;
3305
3306 if (age >= ifp->prefered_lft - regen_advance) {
3307 struct inet6_ifaddr *ifpub = ifp->ifpub;
3308 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3309 next = ifp->tstamp + ifp->prefered_lft * HZ;
3310 if (!ifp->regen_count && ifpub) {
3311 ifp->regen_count++;
3312 in6_ifa_hold(ifp);
3313 in6_ifa_hold(ifpub);
3314 spin_unlock(&ifp->lock);
3315
3316 spin_lock(&ifpub->lock);
3317 ifpub->regen_count = 0;
3318 spin_unlock(&ifpub->lock);
3319 ipv6_create_tempaddr(ifpub, ifp);
3320 in6_ifa_put(ifpub);
3321 in6_ifa_put(ifp);
3322 goto restart;
3323 }
3324 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3325 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3326 spin_unlock(&ifp->lock);
3327 #endif
3328 } else {
3329 /* ifp->prefered_lft <= ifp->valid_lft */
3330 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3331 next = ifp->tstamp + ifp->prefered_lft * HZ;
3332 spin_unlock(&ifp->lock);
3333 }
3334 }
3335 }
3336
3337 next_sec = round_jiffies_up(next);
3338 next_sched = next;
3339
3340 /* If rounded timeout is accurate enough, accept it. */
3341 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3342 next_sched = next_sec;
3343
3344 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3345 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3346 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3347
3348 ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3349 now, next, next_sec, next_sched));
3350
3351 addr_chk_timer.expires = next_sched;
3352 add_timer(&addr_chk_timer);
3353 spin_unlock(&addrconf_verify_lock);
3354 rcu_read_unlock_bh();
3355 }
3356
3357 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3358 {
3359 struct in6_addr *pfx = NULL;
3360
3361 if (addr)
3362 pfx = nla_data(addr);
3363
3364 if (local) {
3365 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3366 pfx = NULL;
3367 else
3368 pfx = nla_data(local);
3369 }
3370
3371 return pfx;
3372 }
3373
3374 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3375 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3376 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3377 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3378 };
3379
3380 static int
3381 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3382 {
3383 struct net *net = sock_net(skb->sk);
3384 struct ifaddrmsg *ifm;
3385 struct nlattr *tb[IFA_MAX+1];
3386 struct in6_addr *pfx;
3387 int err;
3388
3389 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3390 if (err < 0)
3391 return err;
3392
3393 ifm = nlmsg_data(nlh);
3394 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3395 if (pfx == NULL)
3396 return -EINVAL;
3397
3398 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3399 }
3400
3401 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3402 u32 prefered_lft, u32 valid_lft)
3403 {
3404 u32 flags;
3405 clock_t expires;
3406 unsigned long timeout;
3407
3408 if (!valid_lft || (prefered_lft > valid_lft))
3409 return -EINVAL;
3410
3411 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3412 if (addrconf_finite_timeout(timeout)) {
3413 expires = jiffies_to_clock_t(timeout * HZ);
3414 valid_lft = timeout;
3415 flags = RTF_EXPIRES;
3416 } else {
3417 expires = 0;
3418 flags = 0;
3419 ifa_flags |= IFA_F_PERMANENT;
3420 }
3421
3422 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3423 if (addrconf_finite_timeout(timeout)) {
3424 if (timeout == 0)
3425 ifa_flags |= IFA_F_DEPRECATED;
3426 prefered_lft = timeout;
3427 }
3428
3429 spin_lock_bh(&ifp->lock);
3430 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3431 ifp->tstamp = jiffies;
3432 ifp->valid_lft = valid_lft;
3433 ifp->prefered_lft = prefered_lft;
3434
3435 spin_unlock_bh(&ifp->lock);
3436 if (!(ifp->flags&IFA_F_TENTATIVE))
3437 ipv6_ifa_notify(0, ifp);
3438
3439 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3440 expires, flags);
3441 addrconf_verify(0);
3442
3443 return 0;
3444 }
3445
3446 static int
3447 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3448 {
3449 struct net *net = sock_net(skb->sk);
3450 struct ifaddrmsg *ifm;
3451 struct nlattr *tb[IFA_MAX+1];
3452 struct in6_addr *pfx;
3453 struct inet6_ifaddr *ifa;
3454 struct net_device *dev;
3455 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3456 u8 ifa_flags;
3457 int err;
3458
3459 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3460 if (err < 0)
3461 return err;
3462
3463 ifm = nlmsg_data(nlh);
3464 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3465 if (pfx == NULL)
3466 return -EINVAL;
3467
3468 if (tb[IFA_CACHEINFO]) {
3469 struct ifa_cacheinfo *ci;
3470
3471 ci = nla_data(tb[IFA_CACHEINFO]);
3472 valid_lft = ci->ifa_valid;
3473 preferred_lft = ci->ifa_prefered;
3474 } else {
3475 preferred_lft = INFINITY_LIFE_TIME;
3476 valid_lft = INFINITY_LIFE_TIME;
3477 }
3478
3479 dev = __dev_get_by_index(net, ifm->ifa_index);
3480 if (dev == NULL)
3481 return -ENODEV;
3482
3483 /* We ignore other flags so far. */
3484 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3485
3486 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3487 if (ifa == NULL) {
3488 /*
3489 * It would be best to check for !NLM_F_CREATE here but
3490 * userspace alreay relies on not having to provide this.
3491 */
3492 return inet6_addr_add(net, ifm->ifa_index, pfx,
3493 ifm->ifa_prefixlen, ifa_flags,
3494 preferred_lft, valid_lft);
3495 }
3496
3497 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3498 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3499 err = -EEXIST;
3500 else
3501 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3502
3503 in6_ifa_put(ifa);
3504
3505 return err;
3506 }
3507
3508 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3509 u8 scope, int ifindex)
3510 {
3511 struct ifaddrmsg *ifm;
3512
3513 ifm = nlmsg_data(nlh);
3514 ifm->ifa_family = AF_INET6;
3515 ifm->ifa_prefixlen = prefixlen;
3516 ifm->ifa_flags = flags;
3517 ifm->ifa_scope = scope;
3518 ifm->ifa_index = ifindex;
3519 }
3520
3521 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3522 unsigned long tstamp, u32 preferred, u32 valid)
3523 {
3524 struct ifa_cacheinfo ci;
3525
3526 ci.cstamp = cstamp_delta(cstamp);
3527 ci.tstamp = cstamp_delta(tstamp);
3528 ci.ifa_prefered = preferred;
3529 ci.ifa_valid = valid;
3530
3531 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3532 }
3533
3534 static inline int rt_scope(int ifa_scope)
3535 {
3536 if (ifa_scope & IFA_HOST)
3537 return RT_SCOPE_HOST;
3538 else if (ifa_scope & IFA_LINK)
3539 return RT_SCOPE_LINK;
3540 else if (ifa_scope & IFA_SITE)
3541 return RT_SCOPE_SITE;
3542 else
3543 return RT_SCOPE_UNIVERSE;
3544 }
3545
3546 static inline int inet6_ifaddr_msgsize(void)
3547 {
3548 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3549 + nla_total_size(16) /* IFA_ADDRESS */
3550 + nla_total_size(sizeof(struct ifa_cacheinfo));
3551 }
3552
3553 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3554 u32 pid, u32 seq, int event, unsigned int flags)
3555 {
3556 struct nlmsghdr *nlh;
3557 u32 preferred, valid;
3558
3559 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3560 if (nlh == NULL)
3561 return -EMSGSIZE;
3562
3563 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3564 ifa->idev->dev->ifindex);
3565
3566 if (!(ifa->flags&IFA_F_PERMANENT)) {
3567 preferred = ifa->prefered_lft;
3568 valid = ifa->valid_lft;
3569 if (preferred != INFINITY_LIFE_TIME) {
3570 long tval = (jiffies - ifa->tstamp)/HZ;
3571 if (preferred > tval)
3572 preferred -= tval;
3573 else
3574 preferred = 0;
3575 if (valid != INFINITY_LIFE_TIME) {
3576 if (valid > tval)
3577 valid -= tval;
3578 else
3579 valid = 0;
3580 }
3581 }
3582 } else {
3583 preferred = INFINITY_LIFE_TIME;
3584 valid = INFINITY_LIFE_TIME;
3585 }
3586
3587 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3588 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3589 nlmsg_cancel(skb, nlh);
3590 return -EMSGSIZE;
3591 }
3592
3593 return nlmsg_end(skb, nlh);
3594 }
3595
3596 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3597 u32 pid, u32 seq, int event, u16 flags)
3598 {
3599 struct nlmsghdr *nlh;
3600 u8 scope = RT_SCOPE_UNIVERSE;
3601 int ifindex = ifmca->idev->dev->ifindex;
3602
3603 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3604 scope = RT_SCOPE_SITE;
3605
3606 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3607 if (nlh == NULL)
3608 return -EMSGSIZE;
3609
3610 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3611 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3612 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3613 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3614 nlmsg_cancel(skb, nlh);
3615 return -EMSGSIZE;
3616 }
3617
3618 return nlmsg_end(skb, nlh);
3619 }
3620
3621 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3622 u32 pid, u32 seq, int event, unsigned int flags)
3623 {
3624 struct nlmsghdr *nlh;
3625 u8 scope = RT_SCOPE_UNIVERSE;
3626 int ifindex = ifaca->aca_idev->dev->ifindex;
3627
3628 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3629 scope = RT_SCOPE_SITE;
3630
3631 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3632 if (nlh == NULL)
3633 return -EMSGSIZE;
3634
3635 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3636 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3637 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3638 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3639 nlmsg_cancel(skb, nlh);
3640 return -EMSGSIZE;
3641 }
3642
3643 return nlmsg_end(skb, nlh);
3644 }
3645
3646 enum addr_type_t {
3647 UNICAST_ADDR,
3648 MULTICAST_ADDR,
3649 ANYCAST_ADDR,
3650 };
3651
3652 /* called with rcu_read_lock() */
3653 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3654 struct netlink_callback *cb, enum addr_type_t type,
3655 int s_ip_idx, int *p_ip_idx)
3656 {
3657 struct ifmcaddr6 *ifmca;
3658 struct ifacaddr6 *ifaca;
3659 int err = 1;
3660 int ip_idx = *p_ip_idx;
3661
3662 read_lock_bh(&idev->lock);
3663 switch (type) {
3664 case UNICAST_ADDR: {
3665 struct inet6_ifaddr *ifa;
3666
3667 /* unicast address incl. temp addr */
3668 list_for_each_entry(ifa, &idev->addr_list, if_list) {
3669 if (++ip_idx < s_ip_idx)
3670 continue;
3671 err = inet6_fill_ifaddr(skb, ifa,
3672 NETLINK_CB(cb->skb).pid,
3673 cb->nlh->nlmsg_seq,
3674 RTM_NEWADDR,
3675 NLM_F_MULTI);
3676 if (err <= 0)
3677 break;
3678 }
3679 break;
3680 }
3681 case MULTICAST_ADDR:
3682 /* multicast address */
3683 for (ifmca = idev->mc_list; ifmca;
3684 ifmca = ifmca->next, ip_idx++) {
3685 if (ip_idx < s_ip_idx)
3686 continue;
3687 err = inet6_fill_ifmcaddr(skb, ifmca,
3688 NETLINK_CB(cb->skb).pid,
3689 cb->nlh->nlmsg_seq,
3690 RTM_GETMULTICAST,
3691 NLM_F_MULTI);
3692 if (err <= 0)
3693 break;
3694 }
3695 break;
3696 case ANYCAST_ADDR:
3697 /* anycast address */
3698 for (ifaca = idev->ac_list; ifaca;
3699 ifaca = ifaca->aca_next, ip_idx++) {
3700 if (ip_idx < s_ip_idx)
3701 continue;
3702 err = inet6_fill_ifacaddr(skb, ifaca,
3703 NETLINK_CB(cb->skb).pid,
3704 cb->nlh->nlmsg_seq,
3705 RTM_GETANYCAST,
3706 NLM_F_MULTI);
3707 if (err <= 0)
3708 break;
3709 }
3710 break;
3711 default:
3712 break;
3713 }
3714 read_unlock_bh(&idev->lock);
3715 *p_ip_idx = ip_idx;
3716 return err;
3717 }
3718
3719 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3720 enum addr_type_t type)
3721 {
3722 struct net *net = sock_net(skb->sk);
3723 int h, s_h;
3724 int idx, ip_idx;
3725 int s_idx, s_ip_idx;
3726 struct net_device *dev;
3727 struct inet6_dev *idev;
3728 struct hlist_head *head;
3729 struct hlist_node *node;
3730
3731 s_h = cb->args[0];
3732 s_idx = idx = cb->args[1];
3733 s_ip_idx = ip_idx = cb->args[2];
3734
3735 rcu_read_lock();
3736 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3737 idx = 0;
3738 head = &net->dev_index_head[h];
3739 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3740 if (idx < s_idx)
3741 goto cont;
3742 if (h > s_h || idx > s_idx)
3743 s_ip_idx = 0;
3744 ip_idx = 0;
3745 idev = __in6_dev_get(dev);
3746 if (!idev)
3747 goto cont;
3748
3749 if (in6_dump_addrs(idev, skb, cb, type,
3750 s_ip_idx, &ip_idx) <= 0)
3751 goto done;
3752 cont:
3753 idx++;
3754 }
3755 }
3756 done:
3757 rcu_read_unlock();
3758 cb->args[0] = h;
3759 cb->args[1] = idx;
3760 cb->args[2] = ip_idx;
3761
3762 return skb->len;
3763 }
3764
3765 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3766 {
3767 enum addr_type_t type = UNICAST_ADDR;
3768
3769 return inet6_dump_addr(skb, cb, type);
3770 }
3771
3772 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3773 {
3774 enum addr_type_t type = MULTICAST_ADDR;
3775
3776 return inet6_dump_addr(skb, cb, type);
3777 }
3778
3779
3780 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3781 {
3782 enum addr_type_t type = ANYCAST_ADDR;
3783
3784 return inet6_dump_addr(skb, cb, type);
3785 }
3786
3787 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3788 void *arg)
3789 {
3790 struct net *net = sock_net(in_skb->sk);
3791 struct ifaddrmsg *ifm;
3792 struct nlattr *tb[IFA_MAX+1];
3793 struct in6_addr *addr = NULL;
3794 struct net_device *dev = NULL;
3795 struct inet6_ifaddr *ifa;
3796 struct sk_buff *skb;
3797 int err;
3798
3799 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3800 if (err < 0)
3801 goto errout;
3802
3803 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3804 if (addr == NULL) {
3805 err = -EINVAL;
3806 goto errout;
3807 }
3808
3809 ifm = nlmsg_data(nlh);
3810 if (ifm->ifa_index)
3811 dev = __dev_get_by_index(net, ifm->ifa_index);
3812
3813 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
3814 if (!ifa) {
3815 err = -EADDRNOTAVAIL;
3816 goto errout;
3817 }
3818
3819 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
3820 if (!skb) {
3821 err = -ENOBUFS;
3822 goto errout_ifa;
3823 }
3824
3825 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3826 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3827 if (err < 0) {
3828 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3829 WARN_ON(err == -EMSGSIZE);
3830 kfree_skb(skb);
3831 goto errout_ifa;
3832 }
3833 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
3834 errout_ifa:
3835 in6_ifa_put(ifa);
3836 errout:
3837 return err;
3838 }
3839
3840 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3841 {
3842 struct sk_buff *skb;
3843 struct net *net = dev_net(ifa->idev->dev);
3844 int err = -ENOBUFS;
3845
3846 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3847 if (skb == NULL)
3848 goto errout;
3849
3850 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3851 if (err < 0) {
3852 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3853 WARN_ON(err == -EMSGSIZE);
3854 kfree_skb(skb);
3855 goto errout;
3856 }
3857 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3858 return;
3859 errout:
3860 if (err < 0)
3861 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3862 }
3863
3864 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3865 __s32 *array, int bytes)
3866 {
3867 BUG_ON(bytes < (DEVCONF_MAX * 4));
3868
3869 memset(array, 0, bytes);
3870 array[DEVCONF_FORWARDING] = cnf->forwarding;
3871 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3872 array[DEVCONF_MTU6] = cnf->mtu6;
3873 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3874 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3875 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3876 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3877 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3878 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
3879 jiffies_to_msecs(cnf->rtr_solicit_interval);
3880 array[DEVCONF_RTR_SOLICIT_DELAY] =
3881 jiffies_to_msecs(cnf->rtr_solicit_delay);
3882 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3883 #ifdef CONFIG_IPV6_PRIVACY
3884 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3885 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3886 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3887 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3888 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3889 #endif
3890 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3891 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3892 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3893 #ifdef CONFIG_IPV6_ROUTER_PREF
3894 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3895 array[DEVCONF_RTR_PROBE_INTERVAL] =
3896 jiffies_to_msecs(cnf->rtr_probe_interval);
3897 #ifdef CONFIG_IPV6_ROUTE_INFO
3898 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3899 #endif
3900 #endif
3901 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3902 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3903 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3904 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3905 #endif
3906 #ifdef CONFIG_IPV6_MROUTE
3907 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
3908 #endif
3909 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
3910 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
3911 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
3912 }
3913
3914 static inline size_t inet6_ifla6_size(void)
3915 {
3916 return nla_total_size(4) /* IFLA_INET6_FLAGS */
3917 + nla_total_size(sizeof(struct ifla_cacheinfo))
3918 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3919 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3920 + nla_total_size(ICMP6_MIB_MAX * 8); /* IFLA_INET6_ICMP6STATS */
3921 }
3922
3923 static inline size_t inet6_if_nlmsg_size(void)
3924 {
3925 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3926 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3927 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3928 + nla_total_size(4) /* IFLA_MTU */
3929 + nla_total_size(4) /* IFLA_LINK */
3930 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
3931 }
3932
3933 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
3934 int items, int bytes)
3935 {
3936 int i;
3937 int pad = bytes - sizeof(u64) * items;
3938 BUG_ON(pad < 0);
3939
3940 /* Use put_unaligned() because stats may not be aligned for u64. */
3941 put_unaligned(items, &stats[0]);
3942 for (i = 1; i < items; i++)
3943 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
3944
3945 memset(&stats[items], 0, pad);
3946 }
3947
3948 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib,
3949 int items, int bytes, size_t syncpoff)
3950 {
3951 int i;
3952 int pad = bytes - sizeof(u64) * items;
3953 BUG_ON(pad < 0);
3954
3955 /* Use put_unaligned() because stats may not be aligned for u64. */
3956 put_unaligned(items, &stats[0]);
3957 for (i = 1; i < items; i++)
3958 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
3959
3960 memset(&stats[items], 0, pad);
3961 }
3962
3963 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3964 int bytes)
3965 {
3966 switch (attrtype) {
3967 case IFLA_INET6_STATS:
3968 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6,
3969 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
3970 break;
3971 case IFLA_INET6_ICMP6STATS:
3972 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
3973 break;
3974 }
3975 }
3976
3977 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
3978 {
3979 struct nlattr *nla;
3980 struct ifla_cacheinfo ci;
3981
3982 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
3983
3984 ci.max_reasm_len = IPV6_MAXPLEN;
3985 ci.tstamp = cstamp_delta(idev->tstamp);
3986 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
3987 ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time);
3988 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3989
3990 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3991 if (nla == NULL)
3992 goto nla_put_failure;
3993 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
3994
3995 /* XXX - MC not implemented */
3996
3997 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3998 if (nla == NULL)
3999 goto nla_put_failure;
4000 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4001
4002 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4003 if (nla == NULL)
4004 goto nla_put_failure;
4005 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4006
4007 return 0;
4008
4009 nla_put_failure:
4010 return -EMSGSIZE;
4011 }
4012
4013 static size_t inet6_get_link_af_size(const struct net_device *dev)
4014 {
4015 if (!__in6_dev_get(dev))
4016 return 0;
4017
4018 return inet6_ifla6_size();
4019 }
4020
4021 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
4022 {
4023 struct inet6_dev *idev = __in6_dev_get(dev);
4024
4025 if (!idev)
4026 return -ENODATA;
4027
4028 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4029 return -EMSGSIZE;
4030
4031 return 0;
4032 }
4033
4034 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
4035 u32 pid, u32 seq, int event, unsigned int flags)
4036 {
4037 struct net_device *dev = idev->dev;
4038 struct ifinfomsg *hdr;
4039 struct nlmsghdr *nlh;
4040 void *protoinfo;
4041
4042 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
4043 if (nlh == NULL)
4044 return -EMSGSIZE;
4045
4046 hdr = nlmsg_data(nlh);
4047 hdr->ifi_family = AF_INET6;
4048 hdr->__ifi_pad = 0;
4049 hdr->ifi_type = dev->type;
4050 hdr->ifi_index = dev->ifindex;
4051 hdr->ifi_flags = dev_get_flags(dev);
4052 hdr->ifi_change = 0;
4053
4054 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
4055
4056 if (dev->addr_len)
4057 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
4058
4059 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
4060 if (dev->ifindex != dev->iflink)
4061 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
4062
4063 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4064 if (protoinfo == NULL)
4065 goto nla_put_failure;
4066
4067 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4068 goto nla_put_failure;
4069
4070 nla_nest_end(skb, protoinfo);
4071 return nlmsg_end(skb, nlh);
4072
4073 nla_put_failure:
4074 nlmsg_cancel(skb, nlh);
4075 return -EMSGSIZE;
4076 }
4077
4078 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4079 {
4080 struct net *net = sock_net(skb->sk);
4081 int h, s_h;
4082 int idx = 0, s_idx;
4083 struct net_device *dev;
4084 struct inet6_dev *idev;
4085 struct hlist_head *head;
4086 struct hlist_node *node;
4087
4088 s_h = cb->args[0];
4089 s_idx = cb->args[1];
4090
4091 rcu_read_lock();
4092 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4093 idx = 0;
4094 head = &net->dev_index_head[h];
4095 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
4096 if (idx < s_idx)
4097 goto cont;
4098 idev = __in6_dev_get(dev);
4099 if (!idev)
4100 goto cont;
4101 if (inet6_fill_ifinfo(skb, idev,
4102 NETLINK_CB(cb->skb).pid,
4103 cb->nlh->nlmsg_seq,
4104 RTM_NEWLINK, NLM_F_MULTI) <= 0)
4105 goto out;
4106 cont:
4107 idx++;
4108 }
4109 }
4110 out:
4111 rcu_read_unlock();
4112 cb->args[1] = idx;
4113 cb->args[0] = h;
4114
4115 return skb->len;
4116 }
4117
4118 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4119 {
4120 struct sk_buff *skb;
4121 struct net *net = dev_net(idev->dev);
4122 int err = -ENOBUFS;
4123
4124 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
4125 if (skb == NULL)
4126 goto errout;
4127
4128 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
4129 if (err < 0) {
4130 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4131 WARN_ON(err == -EMSGSIZE);
4132 kfree_skb(skb);
4133 goto errout;
4134 }
4135 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
4136 return;
4137 errout:
4138 if (err < 0)
4139 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
4140 }
4141
4142 static inline size_t inet6_prefix_nlmsg_size(void)
4143 {
4144 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4145 + nla_total_size(sizeof(struct in6_addr))
4146 + nla_total_size(sizeof(struct prefix_cacheinfo));
4147 }
4148
4149 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
4150 struct prefix_info *pinfo, u32 pid, u32 seq,
4151 int event, unsigned int flags)
4152 {
4153 struct prefixmsg *pmsg;
4154 struct nlmsghdr *nlh;
4155 struct prefix_cacheinfo ci;
4156
4157 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
4158 if (nlh == NULL)
4159 return -EMSGSIZE;
4160
4161 pmsg = nlmsg_data(nlh);
4162 pmsg->prefix_family = AF_INET6;
4163 pmsg->prefix_pad1 = 0;
4164 pmsg->prefix_pad2 = 0;
4165 pmsg->prefix_ifindex = idev->dev->ifindex;
4166 pmsg->prefix_len = pinfo->prefix_len;
4167 pmsg->prefix_type = pinfo->type;
4168 pmsg->prefix_pad3 = 0;
4169 pmsg->prefix_flags = 0;
4170 if (pinfo->onlink)
4171 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4172 if (pinfo->autoconf)
4173 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4174
4175 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
4176
4177 ci.preferred_time = ntohl(pinfo->prefered);
4178 ci.valid_time = ntohl(pinfo->valid);
4179 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
4180
4181 return nlmsg_end(skb, nlh);
4182
4183 nla_put_failure:
4184 nlmsg_cancel(skb, nlh);
4185 return -EMSGSIZE;
4186 }
4187
4188 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
4189 struct prefix_info *pinfo)
4190 {
4191 struct sk_buff *skb;
4192 struct net *net = dev_net(idev->dev);
4193 int err = -ENOBUFS;
4194
4195 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
4196 if (skb == NULL)
4197 goto errout;
4198
4199 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
4200 if (err < 0) {
4201 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4202 WARN_ON(err == -EMSGSIZE);
4203 kfree_skb(skb);
4204 goto errout;
4205 }
4206 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4207 return;
4208 errout:
4209 if (err < 0)
4210 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
4211 }
4212
4213 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4214 {
4215 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4216
4217 switch (event) {
4218 case RTM_NEWADDR:
4219 /*
4220 * If the address was optimistic
4221 * we inserted the route at the start of
4222 * our DAD process, so we don't need
4223 * to do it again
4224 */
4225 if (!(ifp->rt->rt6i_node))
4226 ip6_ins_rt(ifp->rt);
4227 if (ifp->idev->cnf.forwarding)
4228 addrconf_join_anycast(ifp);
4229 break;
4230 case RTM_DELADDR:
4231 if (ifp->idev->cnf.forwarding)
4232 addrconf_leave_anycast(ifp);
4233 addrconf_leave_solict(ifp->idev, &ifp->addr);
4234 dst_hold(&ifp->rt->dst);
4235
4236 if (ip6_del_rt(ifp->rt))
4237 dst_free(&ifp->rt->dst);
4238 break;
4239 }
4240 }
4241
4242 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4243 {
4244 rcu_read_lock_bh();
4245 if (likely(ifp->idev->dead == 0))
4246 __ipv6_ifa_notify(event, ifp);
4247 rcu_read_unlock_bh();
4248 }
4249
4250 #ifdef CONFIG_SYSCTL
4251
4252 static
4253 int addrconf_sysctl_forward(ctl_table *ctl, int write,
4254 void __user *buffer, size_t *lenp, loff_t *ppos)
4255 {
4256 int *valp = ctl->data;
4257 int val = *valp;
4258 loff_t pos = *ppos;
4259 int ret;
4260
4261 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
4262
4263 if (write)
4264 ret = addrconf_fixup_forwarding(ctl, valp, val);
4265 if (ret)
4266 *ppos = pos;
4267 return ret;
4268 }
4269
4270 static void dev_disable_change(struct inet6_dev *idev)
4271 {
4272 if (!idev || !idev->dev)
4273 return;
4274
4275 if (idev->cnf.disable_ipv6)
4276 addrconf_notify(NULL, NETDEV_DOWN, idev->dev);
4277 else
4278 addrconf_notify(NULL, NETDEV_UP, idev->dev);
4279 }
4280
4281 static void addrconf_disable_change(struct net *net, __s32 newf)
4282 {
4283 struct net_device *dev;
4284 struct inet6_dev *idev;
4285
4286 rcu_read_lock();
4287 for_each_netdev_rcu(net, dev) {
4288 idev = __in6_dev_get(dev);
4289 if (idev) {
4290 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4291 idev->cnf.disable_ipv6 = newf;
4292 if (changed)
4293 dev_disable_change(idev);
4294 }
4295 }
4296 rcu_read_unlock();
4297 }
4298
4299 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int old)
4300 {
4301 struct net *net;
4302
4303 net = (struct net *)table->extra2;
4304
4305 if (p == &net->ipv6.devconf_dflt->disable_ipv6)
4306 return 0;
4307
4308 if (!rtnl_trylock()) {
4309 /* Restore the original values before restarting */
4310 *p = old;
4311 return restart_syscall();
4312 }
4313
4314 if (p == &net->ipv6.devconf_all->disable_ipv6) {
4315 __s32 newf = net->ipv6.devconf_all->disable_ipv6;
4316 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4317 addrconf_disable_change(net, newf);
4318 } else if ((!*p) ^ (!old))
4319 dev_disable_change((struct inet6_dev *)table->extra1);
4320
4321 rtnl_unlock();
4322 return 0;
4323 }
4324
4325 static
4326 int addrconf_sysctl_disable(ctl_table *ctl, int write,
4327 void __user *buffer, size_t *lenp, loff_t *ppos)
4328 {
4329 int *valp = ctl->data;
4330 int val = *valp;
4331 loff_t pos = *ppos;
4332 int ret;
4333
4334 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
4335
4336 if (write)
4337 ret = addrconf_disable_ipv6(ctl, valp, val);
4338 if (ret)
4339 *ppos = pos;
4340 return ret;
4341 }
4342
4343 static struct addrconf_sysctl_table
4344 {
4345 struct ctl_table_header *sysctl_header;
4346 ctl_table addrconf_vars[DEVCONF_MAX+1];
4347 char *dev_name;
4348 } addrconf_sysctl __read_mostly = {
4349 .sysctl_header = NULL,
4350 .addrconf_vars = {
4351 {
4352 .procname = "forwarding",
4353 .data = &ipv6_devconf.forwarding,
4354 .maxlen = sizeof(int),
4355 .mode = 0644,
4356 .proc_handler = addrconf_sysctl_forward,
4357 },
4358 {
4359 .procname = "hop_limit",
4360 .data = &ipv6_devconf.hop_limit,
4361 .maxlen = sizeof(int),
4362 .mode = 0644,
4363 .proc_handler = proc_dointvec,
4364 },
4365 {
4366 .procname = "mtu",
4367 .data = &ipv6_devconf.mtu6,
4368 .maxlen = sizeof(int),
4369 .mode = 0644,
4370 .proc_handler = proc_dointvec,
4371 },
4372 {
4373 .procname = "accept_ra",
4374 .data = &ipv6_devconf.accept_ra,
4375 .maxlen = sizeof(int),
4376 .mode = 0644,
4377 .proc_handler = proc_dointvec,
4378 },
4379 {
4380 .procname = "accept_redirects",
4381 .data = &ipv6_devconf.accept_redirects,
4382 .maxlen = sizeof(int),
4383 .mode = 0644,
4384 .proc_handler = proc_dointvec,
4385 },
4386 {
4387 .procname = "autoconf",
4388 .data = &ipv6_devconf.autoconf,
4389 .maxlen = sizeof(int),
4390 .mode = 0644,
4391 .proc_handler = proc_dointvec,
4392 },
4393 {
4394 .procname = "dad_transmits",
4395 .data = &ipv6_devconf.dad_transmits,
4396 .maxlen = sizeof(int),
4397 .mode = 0644,
4398 .proc_handler = proc_dointvec,
4399 },
4400 {
4401 .procname = "router_solicitations",
4402 .data = &ipv6_devconf.rtr_solicits,
4403 .maxlen = sizeof(int),
4404 .mode = 0644,
4405 .proc_handler = proc_dointvec,
4406 },
4407 {
4408 .procname = "router_solicitation_interval",
4409 .data = &ipv6_devconf.rtr_solicit_interval,
4410 .maxlen = sizeof(int),
4411 .mode = 0644,
4412 .proc_handler = proc_dointvec_jiffies,
4413 },
4414 {
4415 .procname = "router_solicitation_delay",
4416 .data = &ipv6_devconf.rtr_solicit_delay,
4417 .maxlen = sizeof(int),
4418 .mode = 0644,
4419 .proc_handler = proc_dointvec_jiffies,
4420 },
4421 {
4422 .procname = "force_mld_version",
4423 .data = &ipv6_devconf.force_mld_version,
4424 .maxlen = sizeof(int),
4425 .mode = 0644,
4426 .proc_handler = proc_dointvec,
4427 },
4428 #ifdef CONFIG_IPV6_PRIVACY
4429 {
4430 .procname = "use_tempaddr",
4431 .data = &ipv6_devconf.use_tempaddr,
4432 .maxlen = sizeof(int),
4433 .mode = 0644,
4434 .proc_handler = proc_dointvec,
4435 },
4436 {
4437 .procname = "temp_valid_lft",
4438 .data = &ipv6_devconf.temp_valid_lft,
4439 .maxlen = sizeof(int),
4440 .mode = 0644,
4441 .proc_handler = proc_dointvec,
4442 },
4443 {
4444 .procname = "temp_prefered_lft",
4445 .data = &ipv6_devconf.temp_prefered_lft,
4446 .maxlen = sizeof(int),
4447 .mode = 0644,
4448 .proc_handler = proc_dointvec,
4449 },
4450 {
4451 .procname = "regen_max_retry",
4452 .data = &ipv6_devconf.regen_max_retry,
4453 .maxlen = sizeof(int),
4454 .mode = 0644,
4455 .proc_handler = proc_dointvec,
4456 },
4457 {
4458 .procname = "max_desync_factor",
4459 .data = &ipv6_devconf.max_desync_factor,
4460 .maxlen = sizeof(int),
4461 .mode = 0644,
4462 .proc_handler = proc_dointvec,
4463 },
4464 #endif
4465 {
4466 .procname = "max_addresses",
4467 .data = &ipv6_devconf.max_addresses,
4468 .maxlen = sizeof(int),
4469 .mode = 0644,
4470 .proc_handler = proc_dointvec,
4471 },
4472 {
4473 .procname = "accept_ra_defrtr",
4474 .data = &ipv6_devconf.accept_ra_defrtr,
4475 .maxlen = sizeof(int),
4476 .mode = 0644,
4477 .proc_handler = proc_dointvec,
4478 },
4479 {
4480 .procname = "accept_ra_pinfo",
4481 .data = &ipv6_devconf.accept_ra_pinfo,
4482 .maxlen = sizeof(int),
4483 .mode = 0644,
4484 .proc_handler = proc_dointvec,
4485 },
4486 #ifdef CONFIG_IPV6_ROUTER_PREF
4487 {
4488 .procname = "accept_ra_rtr_pref",
4489 .data = &ipv6_devconf.accept_ra_rtr_pref,
4490 .maxlen = sizeof(int),
4491 .mode = 0644,
4492 .proc_handler = proc_dointvec,
4493 },
4494 {
4495 .procname = "router_probe_interval",
4496 .data = &ipv6_devconf.rtr_probe_interval,
4497 .maxlen = sizeof(int),
4498 .mode = 0644,
4499 .proc_handler = proc_dointvec_jiffies,
4500 },
4501 #ifdef CONFIG_IPV6_ROUTE_INFO
4502 {
4503 .procname = "accept_ra_rt_info_max_plen",
4504 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4505 .maxlen = sizeof(int),
4506 .mode = 0644,
4507 .proc_handler = proc_dointvec,
4508 },
4509 #endif
4510 #endif
4511 {
4512 .procname = "proxy_ndp",
4513 .data = &ipv6_devconf.proxy_ndp,
4514 .maxlen = sizeof(int),
4515 .mode = 0644,
4516 .proc_handler = proc_dointvec,
4517 },
4518 {
4519 .procname = "accept_source_route",
4520 .data = &ipv6_devconf.accept_source_route,
4521 .maxlen = sizeof(int),
4522 .mode = 0644,
4523 .proc_handler = proc_dointvec,
4524 },
4525 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4526 {
4527 .procname = "optimistic_dad",
4528 .data = &ipv6_devconf.optimistic_dad,
4529 .maxlen = sizeof(int),
4530 .mode = 0644,
4531 .proc_handler = proc_dointvec,
4532
4533 },
4534 #endif
4535 #ifdef CONFIG_IPV6_MROUTE
4536 {
4537 .procname = "mc_forwarding",
4538 .data = &ipv6_devconf.mc_forwarding,
4539 .maxlen = sizeof(int),
4540 .mode = 0444,
4541 .proc_handler = proc_dointvec,
4542 },
4543 #endif
4544 {
4545 .procname = "disable_ipv6",
4546 .data = &ipv6_devconf.disable_ipv6,
4547 .maxlen = sizeof(int),
4548 .mode = 0644,
4549 .proc_handler = addrconf_sysctl_disable,
4550 },
4551 {
4552 .procname = "accept_dad",
4553 .data = &ipv6_devconf.accept_dad,
4554 .maxlen = sizeof(int),
4555 .mode = 0644,
4556 .proc_handler = proc_dointvec,
4557 },
4558 {
4559 .procname = "force_tllao",
4560 .data = &ipv6_devconf.force_tllao,
4561 .maxlen = sizeof(int),
4562 .mode = 0644,
4563 .proc_handler = proc_dointvec
4564 },
4565 {
4566 /* sentinel */
4567 }
4568 },
4569 };
4570
4571 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4572 struct inet6_dev *idev, struct ipv6_devconf *p)
4573 {
4574 int i;
4575 struct addrconf_sysctl_table *t;
4576
4577 #define ADDRCONF_CTL_PATH_DEV 3
4578
4579 struct ctl_path addrconf_ctl_path[] = {
4580 { .procname = "net", },
4581 { .procname = "ipv6", },
4582 { .procname = "conf", },
4583 { /* to be set */ },
4584 { },
4585 };
4586
4587
4588 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4589 if (t == NULL)
4590 goto out;
4591
4592 for (i = 0; t->addrconf_vars[i].data; i++) {
4593 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
4594 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4595 t->addrconf_vars[i].extra2 = net;
4596 }
4597
4598 /*
4599 * Make a copy of dev_name, because '.procname' is regarded as const
4600 * by sysctl and we wouldn't want anyone to change it under our feet
4601 * (see SIOCSIFNAME).
4602 */
4603 t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4604 if (!t->dev_name)
4605 goto free;
4606
4607 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
4608
4609 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
4610 t->addrconf_vars);
4611 if (t->sysctl_header == NULL)
4612 goto free_procname;
4613
4614 p->sysctl = t;
4615 return 0;
4616
4617 free_procname:
4618 kfree(t->dev_name);
4619 free:
4620 kfree(t);
4621 out:
4622 return -ENOBUFS;
4623 }
4624
4625 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4626 {
4627 struct addrconf_sysctl_table *t;
4628
4629 if (p->sysctl == NULL)
4630 return;
4631
4632 t = p->sysctl;
4633 p->sysctl = NULL;
4634 unregister_net_sysctl_table(t->sysctl_header);
4635 kfree(t->dev_name);
4636 kfree(t);
4637 }
4638
4639 static void addrconf_sysctl_register(struct inet6_dev *idev)
4640 {
4641 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
4642 &ndisc_ifinfo_sysctl_change);
4643 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
4644 idev, &idev->cnf);
4645 }
4646
4647 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
4648 {
4649 __addrconf_sysctl_unregister(&idev->cnf);
4650 neigh_sysctl_unregister(idev->nd_parms);
4651 }
4652
4653
4654 #endif
4655
4656 static int __net_init addrconf_init_net(struct net *net)
4657 {
4658 int err;
4659 struct ipv6_devconf *all, *dflt;
4660
4661 err = -ENOMEM;
4662 all = &ipv6_devconf;
4663 dflt = &ipv6_devconf_dflt;
4664
4665 if (!net_eq(net, &init_net)) {
4666 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4667 if (all == NULL)
4668 goto err_alloc_all;
4669
4670 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4671 if (dflt == NULL)
4672 goto err_alloc_dflt;
4673 } else {
4674 /* these will be inherited by all namespaces */
4675 dflt->autoconf = ipv6_defaults.autoconf;
4676 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
4677 }
4678
4679 net->ipv6.devconf_all = all;
4680 net->ipv6.devconf_dflt = dflt;
4681
4682 #ifdef CONFIG_SYSCTL
4683 err = __addrconf_sysctl_register(net, "all", NULL, all);
4684 if (err < 0)
4685 goto err_reg_all;
4686
4687 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
4688 if (err < 0)
4689 goto err_reg_dflt;
4690 #endif
4691 return 0;
4692
4693 #ifdef CONFIG_SYSCTL
4694 err_reg_dflt:
4695 __addrconf_sysctl_unregister(all);
4696 err_reg_all:
4697 kfree(dflt);
4698 #endif
4699 err_alloc_dflt:
4700 kfree(all);
4701 err_alloc_all:
4702 return err;
4703 }
4704
4705 static void __net_exit addrconf_exit_net(struct net *net)
4706 {
4707 #ifdef CONFIG_SYSCTL
4708 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4709 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4710 #endif
4711 if (!net_eq(net, &init_net)) {
4712 kfree(net->ipv6.devconf_dflt);
4713 kfree(net->ipv6.devconf_all);
4714 }
4715 }
4716
4717 static struct pernet_operations addrconf_ops = {
4718 .init = addrconf_init_net,
4719 .exit = addrconf_exit_net,
4720 };
4721
4722 /*
4723 * Device notifier
4724 */
4725
4726 int register_inet6addr_notifier(struct notifier_block *nb)
4727 {
4728 return atomic_notifier_chain_register(&inet6addr_chain, nb);
4729 }
4730 EXPORT_SYMBOL(register_inet6addr_notifier);
4731
4732 int unregister_inet6addr_notifier(struct notifier_block *nb)
4733 {
4734 return atomic_notifier_chain_unregister(&inet6addr_chain, nb);
4735 }
4736 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4737
4738 static struct rtnl_af_ops inet6_ops = {
4739 .family = AF_INET6,
4740 .fill_link_af = inet6_fill_link_af,
4741 .get_link_af_size = inet6_get_link_af_size,
4742 };
4743
4744 /*
4745 * Init / cleanup code
4746 */
4747
4748 int __init addrconf_init(void)
4749 {
4750 int i, err;
4751
4752 err = ipv6_addr_label_init();
4753 if (err < 0) {
4754 printk(KERN_CRIT "IPv6 Addrconf:"
4755 " cannot initialize default policy table: %d.\n", err);
4756 goto out;
4757 }
4758
4759 err = register_pernet_subsys(&addrconf_ops);
4760 if (err < 0)
4761 goto out_addrlabel;
4762
4763 /* The addrconf netdev notifier requires that loopback_dev
4764 * has it's ipv6 private information allocated and setup
4765 * before it can bring up and give link-local addresses
4766 * to other devices which are up.
4767 *
4768 * Unfortunately, loopback_dev is not necessarily the first
4769 * entry in the global dev_base list of net devices. In fact,
4770 * it is likely to be the very last entry on that list.
4771 * So this causes the notifier registry below to try and
4772 * give link-local addresses to all devices besides loopback_dev
4773 * first, then loopback_dev, which cases all the non-loopback_dev
4774 * devices to fail to get a link-local address.
4775 *
4776 * So, as a temporary fix, allocate the ipv6 structure for
4777 * loopback_dev first by hand.
4778 * Longer term, all of the dependencies ipv6 has upon the loopback
4779 * device and it being up should be removed.
4780 */
4781 rtnl_lock();
4782 if (!ipv6_add_dev(init_net.loopback_dev))
4783 err = -ENOMEM;
4784 rtnl_unlock();
4785 if (err)
4786 goto errlo;
4787
4788 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4789 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
4790
4791 register_netdevice_notifier(&ipv6_dev_notf);
4792
4793 addrconf_verify(0);
4794
4795 err = rtnl_af_register(&inet6_ops);
4796 if (err < 0)
4797 goto errout_af;
4798
4799 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
4800 NULL);
4801 if (err < 0)
4802 goto errout;
4803
4804 /* Only the first call to __rtnl_register can fail */
4805 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
4806 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
4807 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
4808 inet6_dump_ifaddr, NULL);
4809 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
4810 inet6_dump_ifmcaddr, NULL);
4811 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
4812 inet6_dump_ifacaddr, NULL);
4813
4814 ipv6_addr_label_rtnl_register();
4815
4816 return 0;
4817 errout:
4818 rtnl_af_unregister(&inet6_ops);
4819 errout_af:
4820 unregister_netdevice_notifier(&ipv6_dev_notf);
4821 errlo:
4822 unregister_pernet_subsys(&addrconf_ops);
4823 out_addrlabel:
4824 ipv6_addr_label_cleanup();
4825 out:
4826 return err;
4827 }
4828
4829 void addrconf_cleanup(void)
4830 {
4831 struct net_device *dev;
4832 int i;
4833
4834 unregister_netdevice_notifier(&ipv6_dev_notf);
4835 unregister_pernet_subsys(&addrconf_ops);
4836 ipv6_addr_label_cleanup();
4837
4838 rtnl_lock();
4839
4840 __rtnl_af_unregister(&inet6_ops);
4841
4842 /* clean dev list */
4843 for_each_netdev(&init_net, dev) {
4844 if (__in6_dev_get(dev) == NULL)
4845 continue;
4846 addrconf_ifdown(dev, 1);
4847 }
4848 addrconf_ifdown(init_net.loopback_dev, 2);
4849
4850 /*
4851 * Check hash table.
4852 */
4853 spin_lock_bh(&addrconf_hash_lock);
4854 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4855 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
4856 spin_unlock_bh(&addrconf_hash_lock);
4857
4858 del_timer(&addr_chk_timer);
4859 rtnl_unlock();
4860 }