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drm: Fix authentication kernel crash
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / ipv6 / addrconf.c
blob36806def8cfd5c1b185fc6ebfe06bf91fb6403c9
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 if (!(dev->flags & IFF_LOOPBACK))
1809 addrconf_add_mroute(dev);
1810
1811 /* Add link local route */
1812 addrconf_add_lroute(dev);
1813 return idev;
1814 }
1815
1816 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1817 {
1818 struct prefix_info *pinfo;
1819 __u32 valid_lft;
1820 __u32 prefered_lft;
1821 int addr_type;
1822 struct inet6_dev *in6_dev;
1823 struct net *net = dev_net(dev);
1824
1825 pinfo = (struct prefix_info *) opt;
1826
1827 if (len < sizeof(struct prefix_info)) {
1828 ADBG(("addrconf: prefix option too short\n"));
1829 return;
1830 }
1831
1832 /*
1833 * Validation checks ([ADDRCONF], page 19)
1834 */
1835
1836 addr_type = ipv6_addr_type(&pinfo->prefix);
1837
1838 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1839 return;
1840
1841 valid_lft = ntohl(pinfo->valid);
1842 prefered_lft = ntohl(pinfo->prefered);
1843
1844 if (prefered_lft > valid_lft) {
1845 if (net_ratelimit())
1846 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1847 return;
1848 }
1849
1850 in6_dev = in6_dev_get(dev);
1851
1852 if (in6_dev == NULL) {
1853 if (net_ratelimit())
1854 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1855 return;
1856 }
1857
1858 /*
1859 * Two things going on here:
1860 * 1) Add routes for on-link prefixes
1861 * 2) Configure prefixes with the auto flag set
1862 */
1863
1864 if (pinfo->onlink) {
1865 struct rt6_info *rt;
1866 unsigned long rt_expires;
1867
1868 /* Avoid arithmetic overflow. Really, we could
1869 * save rt_expires in seconds, likely valid_lft,
1870 * but it would require division in fib gc, that it
1871 * not good.
1872 */
1873 if (HZ > USER_HZ)
1874 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
1875 else
1876 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
1877
1878 if (addrconf_finite_timeout(rt_expires))
1879 rt_expires *= HZ;
1880
1881 rt = addrconf_get_prefix_route(&pinfo->prefix,
1882 pinfo->prefix_len,
1883 dev,
1884 RTF_ADDRCONF | RTF_PREFIX_RT,
1885 RTF_GATEWAY | RTF_DEFAULT);
1886
1887 if (rt) {
1888 /* Autoconf prefix route */
1889 if (valid_lft == 0) {
1890 ip6_del_rt(rt);
1891 rt = NULL;
1892 } else if (addrconf_finite_timeout(rt_expires)) {
1893 /* not infinity */
1894 rt->rt6i_expires = jiffies + rt_expires;
1895 rt->rt6i_flags |= RTF_EXPIRES;
1896 } else {
1897 rt->rt6i_flags &= ~RTF_EXPIRES;
1898 rt->rt6i_expires = 0;
1899 }
1900 } else if (valid_lft) {
1901 clock_t expires = 0;
1902 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
1903 if (addrconf_finite_timeout(rt_expires)) {
1904 /* not infinity */
1905 flags |= RTF_EXPIRES;
1906 expires = jiffies_to_clock_t(rt_expires);
1907 }
1908 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1909 dev, expires, flags);
1910 }
1911 if (rt)
1912 dst_release(&rt->dst);
1913 }
1914
1915 /* Try to figure out our local address for this prefix */
1916
1917 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1918 struct inet6_ifaddr * ifp;
1919 struct in6_addr addr;
1920 int create = 0, update_lft = 0;
1921
1922 if (pinfo->prefix_len == 64) {
1923 memcpy(&addr, &pinfo->prefix, 8);
1924 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1925 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1926 in6_dev_put(in6_dev);
1927 return;
1928 }
1929 goto ok;
1930 }
1931 if (net_ratelimit())
1932 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1933 pinfo->prefix_len);
1934 in6_dev_put(in6_dev);
1935 return;
1936
1937 ok:
1938
1939 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1940
1941 if (ifp == NULL && valid_lft) {
1942 int max_addresses = in6_dev->cnf.max_addresses;
1943 u32 addr_flags = 0;
1944
1945 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1946 if (in6_dev->cnf.optimistic_dad &&
1947 !net->ipv6.devconf_all->forwarding)
1948 addr_flags = IFA_F_OPTIMISTIC;
1949 #endif
1950
1951 /* Do not allow to create too much of autoconfigured
1952 * addresses; this would be too easy way to crash kernel.
1953 */
1954 if (!max_addresses ||
1955 ipv6_count_addresses(in6_dev) < max_addresses)
1956 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1957 addr_type&IPV6_ADDR_SCOPE_MASK,
1958 addr_flags);
1959
1960 if (!ifp || IS_ERR(ifp)) {
1961 in6_dev_put(in6_dev);
1962 return;
1963 }
1964
1965 update_lft = create = 1;
1966 ifp->cstamp = jiffies;
1967 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1968 }
1969
1970 if (ifp) {
1971 int flags;
1972 unsigned long now;
1973 #ifdef CONFIG_IPV6_PRIVACY
1974 struct inet6_ifaddr *ift;
1975 #endif
1976 u32 stored_lft;
1977
1978 /* update lifetime (RFC2462 5.5.3 e) */
1979 spin_lock(&ifp->lock);
1980 now = jiffies;
1981 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1982 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1983 else
1984 stored_lft = 0;
1985 if (!update_lft && stored_lft) {
1986 if (valid_lft > MIN_VALID_LIFETIME ||
1987 valid_lft > stored_lft)
1988 update_lft = 1;
1989 else if (stored_lft <= MIN_VALID_LIFETIME) {
1990 /* valid_lft <= stored_lft is always true */
1991 /*
1992 * RFC 4862 Section 5.5.3e:
1993 * "Note that the preferred lifetime of
1994 * the corresponding address is always
1995 * reset to the Preferred Lifetime in
1996 * the received Prefix Information
1997 * option, regardless of whether the
1998 * valid lifetime is also reset or
1999 * ignored."
2000 *
2001 * So if the preferred lifetime in
2002 * this advertisement is different
2003 * than what we have stored, but the
2004 * valid lifetime is invalid, just
2005 * reset prefered_lft.
2006 *
2007 * We must set the valid lifetime
2008 * to the stored lifetime since we'll
2009 * be updating the timestamp below,
2010 * else we'll set it back to the
2011 * minimum.
2012 */
2013 if (prefered_lft != ifp->prefered_lft) {
2014 valid_lft = stored_lft;
2015 update_lft = 1;
2016 }
2017 } else {
2018 valid_lft = MIN_VALID_LIFETIME;
2019 if (valid_lft < prefered_lft)
2020 prefered_lft = valid_lft;
2021 update_lft = 1;
2022 }
2023 }
2024
2025 if (update_lft) {
2026 ifp->valid_lft = valid_lft;
2027 ifp->prefered_lft = prefered_lft;
2028 ifp->tstamp = now;
2029 flags = ifp->flags;
2030 ifp->flags &= ~IFA_F_DEPRECATED;
2031 spin_unlock(&ifp->lock);
2032
2033 if (!(flags&IFA_F_TENTATIVE))
2034 ipv6_ifa_notify(0, ifp);
2035 } else
2036 spin_unlock(&ifp->lock);
2037
2038 #ifdef CONFIG_IPV6_PRIVACY
2039 read_lock_bh(&in6_dev->lock);
2040 /* update all temporary addresses in the list */
2041 list_for_each_entry(ift, &in6_dev->tempaddr_list,
2042 tmp_list) {
2043 int age, max_valid, max_prefered;
2044
2045 if (ifp != ift->ifpub)
2046 continue;
2047
2048 /*
2049 * RFC 4941 section 3.3:
2050 * If a received option will extend the lifetime
2051 * of a public address, the lifetimes of
2052 * temporary addresses should be extended,
2053 * subject to the overall constraint that no
2054 * temporary addresses should ever remain
2055 * "valid" or "preferred" for a time longer than
2056 * (TEMP_VALID_LIFETIME) or
2057 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR),
2058 * respectively.
2059 */
2060 age = (now - ift->cstamp) / HZ;
2061 max_valid = in6_dev->cnf.temp_valid_lft - age;
2062 if (max_valid < 0)
2063 max_valid = 0;
2064
2065 max_prefered = in6_dev->cnf.temp_prefered_lft -
2066 in6_dev->cnf.max_desync_factor -
2067 age;
2068 if (max_prefered < 0)
2069 max_prefered = 0;
2070
2071 if (valid_lft > max_valid)
2072 valid_lft = max_valid;
2073
2074 if (prefered_lft > max_prefered)
2075 prefered_lft = max_prefered;
2076
2077 spin_lock(&ift->lock);
2078 flags = ift->flags;
2079 ift->valid_lft = valid_lft;
2080 ift->prefered_lft = prefered_lft;
2081 ift->tstamp = now;
2082 if (prefered_lft > 0)
2083 ift->flags &= ~IFA_F_DEPRECATED;
2084
2085 spin_unlock(&ift->lock);
2086 if (!(flags&IFA_F_TENTATIVE))
2087 ipv6_ifa_notify(0, ift);
2088 }
2089
2090 if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) {
2091 /*
2092 * When a new public address is created as
2093 * described in [ADDRCONF], also create a new
2094 * temporary address. Also create a temporary
2095 * address if it's enabled but no temporary
2096 * address currently exists.
2097 */
2098 read_unlock_bh(&in6_dev->lock);
2099 ipv6_create_tempaddr(ifp, NULL);
2100 } else {
2101 read_unlock_bh(&in6_dev->lock);
2102 }
2103 #endif
2104 in6_ifa_put(ifp);
2105 addrconf_verify(0);
2106 }
2107 }
2108 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2109 in6_dev_put(in6_dev);
2110 }
2111
2112 /*
2113 * Set destination address.
2114 * Special case for SIT interfaces where we create a new "virtual"
2115 * device.
2116 */
2117 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2118 {
2119 struct in6_ifreq ireq;
2120 struct net_device *dev;
2121 int err = -EINVAL;
2122
2123 rtnl_lock();
2124
2125 err = -EFAULT;
2126 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2127 goto err_exit;
2128
2129 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2130
2131 err = -ENODEV;
2132 if (dev == NULL)
2133 goto err_exit;
2134
2135 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2136 if (dev->type == ARPHRD_SIT) {
2137 const struct net_device_ops *ops = dev->netdev_ops;
2138 struct ifreq ifr;
2139 struct ip_tunnel_parm p;
2140
2141 err = -EADDRNOTAVAIL;
2142 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2143 goto err_exit;
2144
2145 memset(&p, 0, sizeof(p));
2146 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2147 p.iph.saddr = 0;
2148 p.iph.version = 4;
2149 p.iph.ihl = 5;
2150 p.iph.protocol = IPPROTO_IPV6;
2151 p.iph.ttl = 64;
2152 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2153
2154 if (ops->ndo_do_ioctl) {
2155 mm_segment_t oldfs = get_fs();
2156
2157 set_fs(KERNEL_DS);
2158 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2159 set_fs(oldfs);
2160 } else
2161 err = -EOPNOTSUPP;
2162
2163 if (err == 0) {
2164 err = -ENOBUFS;
2165 dev = __dev_get_by_name(net, p.name);
2166 if (!dev)
2167 goto err_exit;
2168 err = dev_open(dev);
2169 }
2170 }
2171 #endif
2172
2173 err_exit:
2174 rtnl_unlock();
2175 return err;
2176 }
2177
2178 /*
2179 * Manual configuration of address on an interface
2180 */
2181 static int inet6_addr_add(struct net *net, int ifindex, const struct in6_addr *pfx,
2182 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
2183 __u32 valid_lft)
2184 {
2185 struct inet6_ifaddr *ifp;
2186 struct inet6_dev *idev;
2187 struct net_device *dev;
2188 int scope;
2189 u32 flags;
2190 clock_t expires;
2191 unsigned long timeout;
2192
2193 ASSERT_RTNL();
2194
2195 if (plen > 128)
2196 return -EINVAL;
2197
2198 /* check the lifetime */
2199 if (!valid_lft || prefered_lft > valid_lft)
2200 return -EINVAL;
2201
2202 dev = __dev_get_by_index(net, ifindex);
2203 if (!dev)
2204 return -ENODEV;
2205
2206 idev = addrconf_add_dev(dev);
2207 if (IS_ERR(idev))
2208 return PTR_ERR(idev);
2209
2210 scope = ipv6_addr_scope(pfx);
2211
2212 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2213 if (addrconf_finite_timeout(timeout)) {
2214 expires = jiffies_to_clock_t(timeout * HZ);
2215 valid_lft = timeout;
2216 flags = RTF_EXPIRES;
2217 } else {
2218 expires = 0;
2219 flags = 0;
2220 ifa_flags |= IFA_F_PERMANENT;
2221 }
2222
2223 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2224 if (addrconf_finite_timeout(timeout)) {
2225 if (timeout == 0)
2226 ifa_flags |= IFA_F_DEPRECATED;
2227 prefered_lft = timeout;
2228 }
2229
2230 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2231
2232 if (!IS_ERR(ifp)) {
2233 spin_lock_bh(&ifp->lock);
2234 ifp->valid_lft = valid_lft;
2235 ifp->prefered_lft = prefered_lft;
2236 ifp->tstamp = jiffies;
2237 spin_unlock_bh(&ifp->lock);
2238
2239 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2240 expires, flags);
2241 /*
2242 * Note that section 3.1 of RFC 4429 indicates
2243 * that the Optimistic flag should not be set for
2244 * manually configured addresses
2245 */
2246 addrconf_dad_start(ifp, 0);
2247 in6_ifa_put(ifp);
2248 addrconf_verify(0);
2249 return 0;
2250 }
2251
2252 return PTR_ERR(ifp);
2253 }
2254
2255 static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx,
2256 unsigned int plen)
2257 {
2258 struct inet6_ifaddr *ifp;
2259 struct inet6_dev *idev;
2260 struct net_device *dev;
2261
2262 if (plen > 128)
2263 return -EINVAL;
2264
2265 dev = __dev_get_by_index(net, ifindex);
2266 if (!dev)
2267 return -ENODEV;
2268
2269 if ((idev = __in6_dev_get(dev)) == NULL)
2270 return -ENXIO;
2271
2272 read_lock_bh(&idev->lock);
2273 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2274 if (ifp->prefix_len == plen &&
2275 ipv6_addr_equal(pfx, &ifp->addr)) {
2276 in6_ifa_hold(ifp);
2277 read_unlock_bh(&idev->lock);
2278
2279 ipv6_del_addr(ifp);
2280
2281 /* If the last address is deleted administratively,
2282 disable IPv6 on this interface.
2283 */
2284 if (list_empty(&idev->addr_list))
2285 addrconf_ifdown(idev->dev, 1);
2286 return 0;
2287 }
2288 }
2289 read_unlock_bh(&idev->lock);
2290 return -EADDRNOTAVAIL;
2291 }
2292
2293
2294 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2295 {
2296 struct in6_ifreq ireq;
2297 int err;
2298
2299 if (!capable(CAP_NET_ADMIN))
2300 return -EPERM;
2301
2302 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2303 return -EFAULT;
2304
2305 rtnl_lock();
2306 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2307 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2308 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2309 rtnl_unlock();
2310 return err;
2311 }
2312
2313 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2314 {
2315 struct in6_ifreq ireq;
2316 int err;
2317
2318 if (!capable(CAP_NET_ADMIN))
2319 return -EPERM;
2320
2321 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2322 return -EFAULT;
2323
2324 rtnl_lock();
2325 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2326 ireq.ifr6_prefixlen);
2327 rtnl_unlock();
2328 return err;
2329 }
2330
2331 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2332 int plen, int scope)
2333 {
2334 struct inet6_ifaddr *ifp;
2335
2336 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT);
2337 if (!IS_ERR(ifp)) {
2338 spin_lock_bh(&ifp->lock);
2339 ifp->flags &= ~IFA_F_TENTATIVE;
2340 spin_unlock_bh(&ifp->lock);
2341 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2342 in6_ifa_put(ifp);
2343 }
2344 }
2345
2346 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2347 static void sit_add_v4_addrs(struct inet6_dev *idev)
2348 {
2349 struct in6_addr addr;
2350 struct net_device *dev;
2351 struct net *net = dev_net(idev->dev);
2352 int scope;
2353
2354 ASSERT_RTNL();
2355
2356 memset(&addr, 0, sizeof(struct in6_addr));
2357 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2358
2359 if (idev->dev->flags&IFF_POINTOPOINT) {
2360 addr.s6_addr32[0] = htonl(0xfe800000);
2361 scope = IFA_LINK;
2362 } else {
2363 scope = IPV6_ADDR_COMPATv4;
2364 }
2365
2366 if (addr.s6_addr32[3]) {
2367 add_addr(idev, &addr, 128, scope);
2368 return;
2369 }
2370
2371 for_each_netdev(net, dev) {
2372 struct in_device * in_dev = __in_dev_get_rtnl(dev);
2373 if (in_dev && (dev->flags & IFF_UP)) {
2374 struct in_ifaddr * ifa;
2375
2376 int flag = scope;
2377
2378 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2379 int plen;
2380
2381 addr.s6_addr32[3] = ifa->ifa_local;
2382
2383 if (ifa->ifa_scope == RT_SCOPE_LINK)
2384 continue;
2385 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2386 if (idev->dev->flags&IFF_POINTOPOINT)
2387 continue;
2388 flag |= IFA_HOST;
2389 }
2390 if (idev->dev->flags&IFF_POINTOPOINT)
2391 plen = 64;
2392 else
2393 plen = 96;
2394
2395 add_addr(idev, &addr, plen, flag);
2396 }
2397 }
2398 }
2399 }
2400 #endif
2401
2402 static void init_loopback(struct net_device *dev)
2403 {
2404 struct inet6_dev *idev;
2405
2406 /* ::1 */
2407
2408 ASSERT_RTNL();
2409
2410 if ((idev = ipv6_find_idev(dev)) == NULL) {
2411 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2412 return;
2413 }
2414
2415 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2416 }
2417
2418 static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr)
2419 {
2420 struct inet6_ifaddr * ifp;
2421 u32 addr_flags = IFA_F_PERMANENT;
2422
2423 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2424 if (idev->cnf.optimistic_dad &&
2425 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2426 addr_flags |= IFA_F_OPTIMISTIC;
2427 #endif
2428
2429
2430 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2431 if (!IS_ERR(ifp)) {
2432 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2433 addrconf_dad_start(ifp, 0);
2434 in6_ifa_put(ifp);
2435 }
2436 }
2437
2438 static void addrconf_dev_config(struct net_device *dev)
2439 {
2440 struct in6_addr addr;
2441 struct inet6_dev * idev;
2442
2443 ASSERT_RTNL();
2444
2445 if ((dev->type != ARPHRD_ETHER) &&
2446 (dev->type != ARPHRD_FDDI) &&
2447 (dev->type != ARPHRD_IEEE802_TR) &&
2448 (dev->type != ARPHRD_ARCNET) &&
2449 (dev->type != ARPHRD_INFINIBAND)) {
2450 /* Alas, we support only Ethernet autoconfiguration. */
2451 return;
2452 }
2453
2454 idev = addrconf_add_dev(dev);
2455 if (IS_ERR(idev))
2456 return;
2457
2458 memset(&addr, 0, sizeof(struct in6_addr));
2459 addr.s6_addr32[0] = htonl(0xFE800000);
2460
2461 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2462 addrconf_add_linklocal(idev, &addr);
2463 }
2464
2465 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2466 static void addrconf_sit_config(struct net_device *dev)
2467 {
2468 struct inet6_dev *idev;
2469
2470 ASSERT_RTNL();
2471
2472 /*
2473 * Configure the tunnel with one of our IPv4
2474 * addresses... we should configure all of
2475 * our v4 addrs in the tunnel
2476 */
2477
2478 if ((idev = ipv6_find_idev(dev)) == NULL) {
2479 printk(KERN_DEBUG "init sit: add_dev failed\n");
2480 return;
2481 }
2482
2483 if (dev->priv_flags & IFF_ISATAP) {
2484 struct in6_addr addr;
2485
2486 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2487 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2488 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2489 addrconf_add_linklocal(idev, &addr);
2490 return;
2491 }
2492
2493 sit_add_v4_addrs(idev);
2494
2495 if (dev->flags&IFF_POINTOPOINT) {
2496 addrconf_add_mroute(dev);
2497 addrconf_add_lroute(dev);
2498 } else
2499 sit_route_add(dev);
2500 }
2501 #endif
2502
2503 #if defined(CONFIG_NET_IPGRE) || defined(CONFIG_NET_IPGRE_MODULE)
2504 static void addrconf_gre_config(struct net_device *dev)
2505 {
2506 struct inet6_dev *idev;
2507 struct in6_addr addr;
2508
2509 pr_info("ipv6: addrconf_gre_config(%s)\n", dev->name);
2510
2511 ASSERT_RTNL();
2512
2513 if ((idev = ipv6_find_idev(dev)) == NULL) {
2514 printk(KERN_DEBUG "init gre: add_dev failed\n");
2515 return;
2516 }
2517
2518 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2519 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2520
2521 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2522 addrconf_add_linklocal(idev, &addr);
2523 }
2524 #endif
2525
2526 static inline int
2527 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2528 {
2529 struct in6_addr lladdr;
2530
2531 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2532 addrconf_add_linklocal(idev, &lladdr);
2533 return 0;
2534 }
2535 return -1;
2536 }
2537
2538 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2539 {
2540 struct net_device *link_dev;
2541 struct net *net = dev_net(idev->dev);
2542
2543 /* first try to inherit the link-local address from the link device */
2544 if (idev->dev->iflink &&
2545 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
2546 if (!ipv6_inherit_linklocal(idev, link_dev))
2547 return;
2548 }
2549 /* then try to inherit it from any device */
2550 for_each_netdev(net, link_dev) {
2551 if (!ipv6_inherit_linklocal(idev, link_dev))
2552 return;
2553 }
2554 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2555 }
2556
2557 /*
2558 * Autoconfigure tunnel with a link-local address so routing protocols,
2559 * DHCPv6, MLD etc. can be run over the virtual link
2560 */
2561
2562 static void addrconf_ip6_tnl_config(struct net_device *dev)
2563 {
2564 struct inet6_dev *idev;
2565
2566 ASSERT_RTNL();
2567
2568 idev = addrconf_add_dev(dev);
2569 if (IS_ERR(idev)) {
2570 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2571 return;
2572 }
2573 ip6_tnl_add_linklocal(idev);
2574 }
2575
2576 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2577 void * data)
2578 {
2579 struct net_device *dev = (struct net_device *) data;
2580 struct inet6_dev *idev = __in6_dev_get(dev);
2581 int run_pending = 0;
2582 int err;
2583
2584 switch (event) {
2585 case NETDEV_REGISTER:
2586 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2587 idev = ipv6_add_dev(dev);
2588 if (!idev)
2589 return notifier_from_errno(-ENOMEM);
2590 }
2591 break;
2592
2593 case NETDEV_UP:
2594 case NETDEV_CHANGE:
2595 if (dev->flags & IFF_SLAVE)
2596 break;
2597
2598 if (event == NETDEV_UP) {
2599 if (!addrconf_qdisc_ok(dev)) {
2600 /* device is not ready yet. */
2601 printk(KERN_INFO
2602 "ADDRCONF(NETDEV_UP): %s: "
2603 "link is not ready\n",
2604 dev->name);
2605 break;
2606 }
2607
2608 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2609 idev = ipv6_add_dev(dev);
2610
2611 if (idev) {
2612 idev->if_flags |= IF_READY;
2613 run_pending = 1;
2614 }
2615 } else {
2616 if (!addrconf_qdisc_ok(dev)) {
2617 /* device is still not ready. */
2618 break;
2619 }
2620
2621 if (idev) {
2622 if (idev->if_flags & IF_READY)
2623 /* device is already configured. */
2624 break;
2625 idev->if_flags |= IF_READY;
2626 }
2627
2628 printk(KERN_INFO
2629 "ADDRCONF(NETDEV_CHANGE): %s: "
2630 "link becomes ready\n",
2631 dev->name);
2632
2633 run_pending = 1;
2634 }
2635
2636 switch (dev->type) {
2637 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2638 case ARPHRD_SIT:
2639 addrconf_sit_config(dev);
2640 break;
2641 #endif
2642 #if defined(CONFIG_NET_IPGRE) || defined(CONFIG_NET_IPGRE_MODULE)
2643 case ARPHRD_IPGRE:
2644 addrconf_gre_config(dev);
2645 break;
2646 #endif
2647 case ARPHRD_TUNNEL6:
2648 addrconf_ip6_tnl_config(dev);
2649 break;
2650 case ARPHRD_LOOPBACK:
2651 init_loopback(dev);
2652 break;
2653
2654 default:
2655 addrconf_dev_config(dev);
2656 break;
2657 }
2658
2659 if (idev) {
2660 if (run_pending)
2661 addrconf_dad_run(idev);
2662
2663 /*
2664 * If the MTU changed during the interface down,
2665 * when the interface up, the changed MTU must be
2666 * reflected in the idev as well as routers.
2667 */
2668 if (idev->cnf.mtu6 != dev->mtu &&
2669 dev->mtu >= IPV6_MIN_MTU) {
2670 rt6_mtu_change(dev, dev->mtu);
2671 idev->cnf.mtu6 = dev->mtu;
2672 }
2673 idev->tstamp = jiffies;
2674 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2675
2676 /*
2677 * If the changed mtu during down is lower than
2678 * IPV6_MIN_MTU stop IPv6 on this interface.
2679 */
2680 if (dev->mtu < IPV6_MIN_MTU)
2681 addrconf_ifdown(dev, 1);
2682 }
2683 break;
2684
2685 case NETDEV_CHANGEMTU:
2686 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2687 rt6_mtu_change(dev, dev->mtu);
2688 idev->cnf.mtu6 = dev->mtu;
2689 break;
2690 }
2691
2692 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2693 idev = ipv6_add_dev(dev);
2694 if (idev)
2695 break;
2696 }
2697
2698 /*
2699 * MTU falled under IPV6_MIN_MTU.
2700 * Stop IPv6 on this interface.
2701 */
2702
2703 case NETDEV_DOWN:
2704 case NETDEV_UNREGISTER:
2705 /*
2706 * Remove all addresses from this interface.
2707 */
2708 addrconf_ifdown(dev, event != NETDEV_DOWN);
2709 break;
2710
2711 case NETDEV_CHANGENAME:
2712 if (idev) {
2713 snmp6_unregister_dev(idev);
2714 addrconf_sysctl_unregister(idev);
2715 addrconf_sysctl_register(idev);
2716 err = snmp6_register_dev(idev);
2717 if (err)
2718 return notifier_from_errno(err);
2719 }
2720 break;
2721
2722 case NETDEV_PRE_TYPE_CHANGE:
2723 case NETDEV_POST_TYPE_CHANGE:
2724 addrconf_type_change(dev, event);
2725 break;
2726 }
2727
2728 return NOTIFY_OK;
2729 }
2730
2731 /*
2732 * addrconf module should be notified of a device going up
2733 */
2734 static struct notifier_block ipv6_dev_notf = {
2735 .notifier_call = addrconf_notify,
2736 };
2737
2738 static void addrconf_type_change(struct net_device *dev, unsigned long event)
2739 {
2740 struct inet6_dev *idev;
2741 ASSERT_RTNL();
2742
2743 idev = __in6_dev_get(dev);
2744
2745 if (event == NETDEV_POST_TYPE_CHANGE)
2746 ipv6_mc_remap(idev);
2747 else if (event == NETDEV_PRE_TYPE_CHANGE)
2748 ipv6_mc_unmap(idev);
2749 }
2750
2751 static int addrconf_ifdown(struct net_device *dev, int how)
2752 {
2753 struct net *net = dev_net(dev);
2754 struct inet6_dev *idev;
2755 struct inet6_ifaddr *ifa;
2756 int state, i;
2757
2758 ASSERT_RTNL();
2759
2760 rt6_ifdown(net, dev);
2761 neigh_ifdown(&nd_tbl, dev);
2762
2763 idev = __in6_dev_get(dev);
2764 if (idev == NULL)
2765 return -ENODEV;
2766
2767 /*
2768 * Step 1: remove reference to ipv6 device from parent device.
2769 * Do not dev_put!
2770 */
2771 if (how) {
2772 idev->dead = 1;
2773
2774 /* protected by rtnl_lock */
2775 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
2776
2777 /* Step 1.5: remove snmp6 entry */
2778 snmp6_unregister_dev(idev);
2779
2780 }
2781
2782 /* Step 2: clear hash table */
2783 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
2784 struct hlist_head *h = &inet6_addr_lst[i];
2785 struct hlist_node *n;
2786
2787 spin_lock_bh(&addrconf_hash_lock);
2788 restart:
2789 hlist_for_each_entry_rcu(ifa, n, h, addr_lst) {
2790 if (ifa->idev == idev) {
2791 hlist_del_init_rcu(&ifa->addr_lst);
2792 addrconf_del_timer(ifa);
2793 goto restart;
2794 }
2795 }
2796 spin_unlock_bh(&addrconf_hash_lock);
2797 }
2798
2799 write_lock_bh(&idev->lock);
2800
2801 /* Step 2: clear flags for stateless addrconf */
2802 if (!how)
2803 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2804
2805 #ifdef CONFIG_IPV6_PRIVACY
2806 if (how && del_timer(&idev->regen_timer))
2807 in6_dev_put(idev);
2808
2809 /* Step 3: clear tempaddr list */
2810 while (!list_empty(&idev->tempaddr_list)) {
2811 ifa = list_first_entry(&idev->tempaddr_list,
2812 struct inet6_ifaddr, tmp_list);
2813 list_del(&ifa->tmp_list);
2814 write_unlock_bh(&idev->lock);
2815 spin_lock_bh(&ifa->lock);
2816
2817 if (ifa->ifpub) {
2818 in6_ifa_put(ifa->ifpub);
2819 ifa->ifpub = NULL;
2820 }
2821 spin_unlock_bh(&ifa->lock);
2822 in6_ifa_put(ifa);
2823 write_lock_bh(&idev->lock);
2824 }
2825 #endif
2826
2827 while (!list_empty(&idev->addr_list)) {
2828 ifa = list_first_entry(&idev->addr_list,
2829 struct inet6_ifaddr, if_list);
2830 addrconf_del_timer(ifa);
2831
2832 list_del(&ifa->if_list);
2833
2834 write_unlock_bh(&idev->lock);
2835
2836 spin_lock_bh(&ifa->state_lock);
2837 state = ifa->state;
2838 ifa->state = INET6_IFADDR_STATE_DEAD;
2839 spin_unlock_bh(&ifa->state_lock);
2840
2841 if (state != INET6_IFADDR_STATE_DEAD) {
2842 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2843 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2844 }
2845 in6_ifa_put(ifa);
2846
2847 write_lock_bh(&idev->lock);
2848 }
2849
2850 write_unlock_bh(&idev->lock);
2851
2852 /* Step 5: Discard multicast list */
2853 if (how)
2854 ipv6_mc_destroy_dev(idev);
2855 else
2856 ipv6_mc_down(idev);
2857
2858 idev->tstamp = jiffies;
2859
2860 /* Last: Shot the device (if unregistered) */
2861 if (how) {
2862 addrconf_sysctl_unregister(idev);
2863 neigh_parms_release(&nd_tbl, idev->nd_parms);
2864 neigh_ifdown(&nd_tbl, dev);
2865 in6_dev_put(idev);
2866 }
2867 return 0;
2868 }
2869
2870 static void addrconf_rs_timer(unsigned long data)
2871 {
2872 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2873 struct inet6_dev *idev = ifp->idev;
2874
2875 read_lock(&idev->lock);
2876 if (idev->dead || !(idev->if_flags & IF_READY))
2877 goto out;
2878
2879 if (idev->cnf.forwarding)
2880 goto out;
2881
2882 /* Announcement received after solicitation was sent */
2883 if (idev->if_flags & IF_RA_RCVD)
2884 goto out;
2885
2886 spin_lock(&ifp->lock);
2887 if (ifp->probes++ < idev->cnf.rtr_solicits) {
2888 /* The wait after the last probe can be shorter */
2889 addrconf_mod_timer(ifp, AC_RS,
2890 (ifp->probes == idev->cnf.rtr_solicits) ?
2891 idev->cnf.rtr_solicit_delay :
2892 idev->cnf.rtr_solicit_interval);
2893 spin_unlock(&ifp->lock);
2894
2895 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2896 } else {
2897 spin_unlock(&ifp->lock);
2898 /*
2899 * Note: we do not support deprecated "all on-link"
2900 * assumption any longer.
2901 */
2902 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2903 idev->dev->name);
2904 }
2905
2906 out:
2907 read_unlock(&idev->lock);
2908 in6_ifa_put(ifp);
2909 }
2910
2911 /*
2912 * Duplicate Address Detection
2913 */
2914 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2915 {
2916 unsigned long rand_num;
2917 struct inet6_dev *idev = ifp->idev;
2918
2919 if (ifp->flags & IFA_F_OPTIMISTIC)
2920 rand_num = 0;
2921 else
2922 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2923
2924 ifp->probes = idev->cnf.dad_transmits;
2925 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2926 }
2927
2928 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2929 {
2930 struct inet6_dev *idev = ifp->idev;
2931 struct net_device *dev = idev->dev;
2932
2933 addrconf_join_solict(dev, &ifp->addr);
2934
2935 net_srandom(ifp->addr.s6_addr32[3]);
2936
2937 read_lock_bh(&idev->lock);
2938 spin_lock(&ifp->lock);
2939 if (ifp->state == INET6_IFADDR_STATE_DEAD)
2940 goto out;
2941
2942 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2943 idev->cnf.accept_dad < 1 ||
2944 !(ifp->flags&IFA_F_TENTATIVE) ||
2945 ifp->flags & IFA_F_NODAD) {
2946 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
2947 spin_unlock(&ifp->lock);
2948 read_unlock_bh(&idev->lock);
2949
2950 addrconf_dad_completed(ifp);
2951 return;
2952 }
2953
2954 if (!(idev->if_flags & IF_READY)) {
2955 spin_unlock(&ifp->lock);
2956 read_unlock_bh(&idev->lock);
2957 /*
2958 * If the device is not ready:
2959 * - keep it tentative if it is a permanent address.
2960 * - otherwise, kill it.
2961 */
2962 in6_ifa_hold(ifp);
2963 addrconf_dad_stop(ifp, 0);
2964 return;
2965 }
2966
2967 /*
2968 * Optimistic nodes can start receiving
2969 * Frames right away
2970 */
2971 if (ifp->flags & IFA_F_OPTIMISTIC)
2972 ip6_ins_rt(ifp->rt);
2973
2974 addrconf_dad_kick(ifp);
2975 out:
2976 spin_unlock(&ifp->lock);
2977 read_unlock_bh(&idev->lock);
2978 }
2979
2980 static void addrconf_dad_timer(unsigned long data)
2981 {
2982 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2983 struct inet6_dev *idev = ifp->idev;
2984 struct in6_addr mcaddr;
2985
2986 if (!ifp->probes && addrconf_dad_end(ifp))
2987 goto out;
2988
2989 read_lock(&idev->lock);
2990 if (idev->dead || !(idev->if_flags & IF_READY)) {
2991 read_unlock(&idev->lock);
2992 goto out;
2993 }
2994
2995 spin_lock(&ifp->lock);
2996 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
2997 spin_unlock(&ifp->lock);
2998 read_unlock(&idev->lock);
2999 goto out;
3000 }
3001
3002 if (ifp->probes == 0) {
3003 /*
3004 * DAD was successful
3005 */
3006
3007 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3008 spin_unlock(&ifp->lock);
3009 read_unlock(&idev->lock);
3010
3011 addrconf_dad_completed(ifp);
3012
3013 goto out;
3014 }
3015
3016 ifp->probes--;
3017 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
3018 spin_unlock(&ifp->lock);
3019 read_unlock(&idev->lock);
3020
3021 /* send a neighbour solicitation for our addr */
3022 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3023 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
3024 out:
3025 in6_ifa_put(ifp);
3026 }
3027
3028 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3029 {
3030 struct net_device *dev = ifp->idev->dev;
3031
3032 /*
3033 * Configure the address for reception. Now it is valid.
3034 */
3035
3036 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3037
3038 /* If added prefix is link local and we are prepared to process
3039 router advertisements, start sending router solicitations.
3040 */
3041
3042 if (((ifp->idev->cnf.accept_ra == 1 && !ifp->idev->cnf.forwarding) ||
3043 ifp->idev->cnf.accept_ra == 2) &&
3044 ifp->idev->cnf.rtr_solicits > 0 &&
3045 (dev->flags&IFF_LOOPBACK) == 0 &&
3046 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
3047 /*
3048 * If a host as already performed a random delay
3049 * [...] as part of DAD [...] there is no need
3050 * to delay again before sending the first RS
3051 */
3052 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
3053
3054 spin_lock_bh(&ifp->lock);
3055 ifp->probes = 1;
3056 ifp->idev->if_flags |= IF_RS_SENT;
3057 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
3058 spin_unlock_bh(&ifp->lock);
3059 }
3060 }
3061
3062 static void addrconf_dad_run(struct inet6_dev *idev)
3063 {
3064 struct inet6_ifaddr *ifp;
3065
3066 read_lock_bh(&idev->lock);
3067 list_for_each_entry(ifp, &idev->addr_list, if_list) {
3068 spin_lock(&ifp->lock);
3069 if (ifp->flags & IFA_F_TENTATIVE &&
3070 ifp->state == INET6_IFADDR_STATE_DAD)
3071 addrconf_dad_kick(ifp);
3072 spin_unlock(&ifp->lock);
3073 }
3074 read_unlock_bh(&idev->lock);
3075 }
3076
3077 #ifdef CONFIG_PROC_FS
3078 struct if6_iter_state {
3079 struct seq_net_private p;
3080 int bucket;
3081 };
3082
3083 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
3084 {
3085 struct inet6_ifaddr *ifa = NULL;
3086 struct if6_iter_state *state = seq->private;
3087 struct net *net = seq_file_net(seq);
3088
3089 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3090 struct hlist_node *n;
3091 hlist_for_each_entry_rcu_bh(ifa, n, &inet6_addr_lst[state->bucket],
3092 addr_lst)
3093 if (net_eq(dev_net(ifa->idev->dev), net))
3094 return ifa;
3095 }
3096 return NULL;
3097 }
3098
3099 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3100 struct inet6_ifaddr *ifa)
3101 {
3102 struct if6_iter_state *state = seq->private;
3103 struct net *net = seq_file_net(seq);
3104 struct hlist_node *n = &ifa->addr_lst;
3105
3106 hlist_for_each_entry_continue_rcu_bh(ifa, n, addr_lst)
3107 if (net_eq(dev_net(ifa->idev->dev), net))
3108 return ifa;
3109
3110 while (++state->bucket < IN6_ADDR_HSIZE) {
3111 hlist_for_each_entry_rcu_bh(ifa, n,
3112 &inet6_addr_lst[state->bucket], addr_lst) {
3113 if (net_eq(dev_net(ifa->idev->dev), net))
3114 return ifa;
3115 }
3116 }
3117
3118 return NULL;
3119 }
3120
3121 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
3122 {
3123 struct inet6_ifaddr *ifa = if6_get_first(seq);
3124
3125 if (ifa)
3126 while (pos && (ifa = if6_get_next(seq, ifa)) != NULL)
3127 --pos;
3128 return pos ? NULL : ifa;
3129 }
3130
3131 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3132 __acquires(rcu_bh)
3133 {
3134 rcu_read_lock_bh();
3135 return if6_get_idx(seq, *pos);
3136 }
3137
3138 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3139 {
3140 struct inet6_ifaddr *ifa;
3141
3142 ifa = if6_get_next(seq, v);
3143 ++*pos;
3144 return ifa;
3145 }
3146
3147 static void if6_seq_stop(struct seq_file *seq, void *v)
3148 __releases(rcu_bh)
3149 {
3150 rcu_read_unlock_bh();
3151 }
3152
3153 static int if6_seq_show(struct seq_file *seq, void *v)
3154 {
3155 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3156 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3157 &ifp->addr,
3158 ifp->idev->dev->ifindex,
3159 ifp->prefix_len,
3160 ifp->scope,
3161 ifp->flags,
3162 ifp->idev->dev->name);
3163 return 0;
3164 }
3165
3166 static const struct seq_operations if6_seq_ops = {
3167 .start = if6_seq_start,
3168 .next = if6_seq_next,
3169 .show = if6_seq_show,
3170 .stop = if6_seq_stop,
3171 };
3172
3173 static int if6_seq_open(struct inode *inode, struct file *file)
3174 {
3175 return seq_open_net(inode, file, &if6_seq_ops,
3176 sizeof(struct if6_iter_state));
3177 }
3178
3179 static const struct file_operations if6_fops = {
3180 .owner = THIS_MODULE,
3181 .open = if6_seq_open,
3182 .read = seq_read,
3183 .llseek = seq_lseek,
3184 .release = seq_release_net,
3185 };
3186
3187 static int __net_init if6_proc_net_init(struct net *net)
3188 {
3189 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
3190 return -ENOMEM;
3191 return 0;
3192 }
3193
3194 static void __net_exit if6_proc_net_exit(struct net *net)
3195 {
3196 proc_net_remove(net, "if_inet6");
3197 }
3198
3199 static struct pernet_operations if6_proc_net_ops = {
3200 .init = if6_proc_net_init,
3201 .exit = if6_proc_net_exit,
3202 };
3203
3204 int __init if6_proc_init(void)
3205 {
3206 return register_pernet_subsys(&if6_proc_net_ops);
3207 }
3208
3209 void if6_proc_exit(void)
3210 {
3211 unregister_pernet_subsys(&if6_proc_net_ops);
3212 }
3213 #endif /* CONFIG_PROC_FS */
3214
3215 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3216 /* Check if address is a home address configured on any interface. */
3217 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3218 {
3219 int ret = 0;
3220 struct inet6_ifaddr *ifp = NULL;
3221 struct hlist_node *n;
3222 unsigned int hash = ipv6_addr_hash(addr);
3223
3224 rcu_read_lock_bh();
3225 hlist_for_each_entry_rcu_bh(ifp, n, &inet6_addr_lst[hash], addr_lst) {
3226 if (!net_eq(dev_net(ifp->idev->dev), net))
3227 continue;
3228 if (ipv6_addr_equal(&ifp->addr, addr) &&
3229 (ifp->flags & IFA_F_HOMEADDRESS)) {
3230 ret = 1;
3231 break;
3232 }
3233 }
3234 rcu_read_unlock_bh();
3235 return ret;
3236 }
3237 #endif
3238
3239 /*
3240 * Periodic address status verification
3241 */
3242
3243 static void addrconf_verify(unsigned long foo)
3244 {
3245 unsigned long now, next, next_sec, next_sched;
3246 struct inet6_ifaddr *ifp;
3247 struct hlist_node *node;
3248 int i;
3249
3250 rcu_read_lock_bh();
3251 spin_lock(&addrconf_verify_lock);
3252 now = jiffies;
3253 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3254
3255 del_timer(&addr_chk_timer);
3256
3257 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3258 restart:
3259 hlist_for_each_entry_rcu_bh(ifp, node,
3260 &inet6_addr_lst[i], addr_lst) {
3261 unsigned long age;
3262
3263 if (ifp->flags & IFA_F_PERMANENT)
3264 continue;
3265
3266 spin_lock(&ifp->lock);
3267 /* We try to batch several events at once. */
3268 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3269
3270 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3271 age >= ifp->valid_lft) {
3272 spin_unlock(&ifp->lock);
3273 in6_ifa_hold(ifp);
3274 ipv6_del_addr(ifp);
3275 goto restart;
3276 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3277 spin_unlock(&ifp->lock);
3278 continue;
3279 } else if (age >= ifp->prefered_lft) {
3280 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3281 int deprecate = 0;
3282
3283 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3284 deprecate = 1;
3285 ifp->flags |= IFA_F_DEPRECATED;
3286 }
3287
3288 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3289 next = ifp->tstamp + ifp->valid_lft * HZ;
3290
3291 spin_unlock(&ifp->lock);
3292
3293 if (deprecate) {
3294 in6_ifa_hold(ifp);
3295
3296 ipv6_ifa_notify(0, ifp);
3297 in6_ifa_put(ifp);
3298 goto restart;
3299 }
3300 #ifdef CONFIG_IPV6_PRIVACY
3301 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3302 !(ifp->flags&IFA_F_TENTATIVE)) {
3303 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3304 ifp->idev->cnf.dad_transmits *
3305 ifp->idev->nd_parms->retrans_time / HZ;
3306
3307 if (age >= ifp->prefered_lft - regen_advance) {
3308 struct inet6_ifaddr *ifpub = ifp->ifpub;
3309 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3310 next = ifp->tstamp + ifp->prefered_lft * HZ;
3311 if (!ifp->regen_count && ifpub) {
3312 ifp->regen_count++;
3313 in6_ifa_hold(ifp);
3314 in6_ifa_hold(ifpub);
3315 spin_unlock(&ifp->lock);
3316
3317 spin_lock(&ifpub->lock);
3318 ifpub->regen_count = 0;
3319 spin_unlock(&ifpub->lock);
3320 ipv6_create_tempaddr(ifpub, ifp);
3321 in6_ifa_put(ifpub);
3322 in6_ifa_put(ifp);
3323 goto restart;
3324 }
3325 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3326 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3327 spin_unlock(&ifp->lock);
3328 #endif
3329 } else {
3330 /* ifp->prefered_lft <= ifp->valid_lft */
3331 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3332 next = ifp->tstamp + ifp->prefered_lft * HZ;
3333 spin_unlock(&ifp->lock);
3334 }
3335 }
3336 }
3337
3338 next_sec = round_jiffies_up(next);
3339 next_sched = next;
3340
3341 /* If rounded timeout is accurate enough, accept it. */
3342 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3343 next_sched = next_sec;
3344
3345 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3346 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3347 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3348
3349 ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3350 now, next, next_sec, next_sched));
3351
3352 addr_chk_timer.expires = next_sched;
3353 add_timer(&addr_chk_timer);
3354 spin_unlock(&addrconf_verify_lock);
3355 rcu_read_unlock_bh();
3356 }
3357
3358 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3359 {
3360 struct in6_addr *pfx = NULL;
3361
3362 if (addr)
3363 pfx = nla_data(addr);
3364
3365 if (local) {
3366 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3367 pfx = NULL;
3368 else
3369 pfx = nla_data(local);
3370 }
3371
3372 return pfx;
3373 }
3374
3375 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3376 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3377 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3378 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3379 };
3380
3381 static int
3382 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3383 {
3384 struct net *net = sock_net(skb->sk);
3385 struct ifaddrmsg *ifm;
3386 struct nlattr *tb[IFA_MAX+1];
3387 struct in6_addr *pfx;
3388 int err;
3389
3390 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3391 if (err < 0)
3392 return err;
3393
3394 ifm = nlmsg_data(nlh);
3395 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3396 if (pfx == NULL)
3397 return -EINVAL;
3398
3399 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3400 }
3401
3402 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3403 u32 prefered_lft, u32 valid_lft)
3404 {
3405 u32 flags;
3406 clock_t expires;
3407 unsigned long timeout;
3408
3409 if (!valid_lft || (prefered_lft > valid_lft))
3410 return -EINVAL;
3411
3412 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3413 if (addrconf_finite_timeout(timeout)) {
3414 expires = jiffies_to_clock_t(timeout * HZ);
3415 valid_lft = timeout;
3416 flags = RTF_EXPIRES;
3417 } else {
3418 expires = 0;
3419 flags = 0;
3420 ifa_flags |= IFA_F_PERMANENT;
3421 }
3422
3423 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3424 if (addrconf_finite_timeout(timeout)) {
3425 if (timeout == 0)
3426 ifa_flags |= IFA_F_DEPRECATED;
3427 prefered_lft = timeout;
3428 }
3429
3430 spin_lock_bh(&ifp->lock);
3431 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3432 ifp->tstamp = jiffies;
3433 ifp->valid_lft = valid_lft;
3434 ifp->prefered_lft = prefered_lft;
3435
3436 spin_unlock_bh(&ifp->lock);
3437 if (!(ifp->flags&IFA_F_TENTATIVE))
3438 ipv6_ifa_notify(0, ifp);
3439
3440 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3441 expires, flags);
3442 addrconf_verify(0);
3443
3444 return 0;
3445 }
3446
3447 static int
3448 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3449 {
3450 struct net *net = sock_net(skb->sk);
3451 struct ifaddrmsg *ifm;
3452 struct nlattr *tb[IFA_MAX+1];
3453 struct in6_addr *pfx;
3454 struct inet6_ifaddr *ifa;
3455 struct net_device *dev;
3456 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3457 u8 ifa_flags;
3458 int err;
3459
3460 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3461 if (err < 0)
3462 return err;
3463
3464 ifm = nlmsg_data(nlh);
3465 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3466 if (pfx == NULL)
3467 return -EINVAL;
3468
3469 if (tb[IFA_CACHEINFO]) {
3470 struct ifa_cacheinfo *ci;
3471
3472 ci = nla_data(tb[IFA_CACHEINFO]);
3473 valid_lft = ci->ifa_valid;
3474 preferred_lft = ci->ifa_prefered;
3475 } else {
3476 preferred_lft = INFINITY_LIFE_TIME;
3477 valid_lft = INFINITY_LIFE_TIME;
3478 }
3479
3480 dev = __dev_get_by_index(net, ifm->ifa_index);
3481 if (dev == NULL)
3482 return -ENODEV;
3483
3484 /* We ignore other flags so far. */
3485 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3486
3487 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3488 if (ifa == NULL) {
3489 /*
3490 * It would be best to check for !NLM_F_CREATE here but
3491 * userspace alreay relies on not having to provide this.
3492 */
3493 return inet6_addr_add(net, ifm->ifa_index, pfx,
3494 ifm->ifa_prefixlen, ifa_flags,
3495 preferred_lft, valid_lft);
3496 }
3497
3498 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3499 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3500 err = -EEXIST;
3501 else
3502 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3503
3504 in6_ifa_put(ifa);
3505
3506 return err;
3507 }
3508
3509 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3510 u8 scope, int ifindex)
3511 {
3512 struct ifaddrmsg *ifm;
3513
3514 ifm = nlmsg_data(nlh);
3515 ifm->ifa_family = AF_INET6;
3516 ifm->ifa_prefixlen = prefixlen;
3517 ifm->ifa_flags = flags;
3518 ifm->ifa_scope = scope;
3519 ifm->ifa_index = ifindex;
3520 }
3521
3522 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3523 unsigned long tstamp, u32 preferred, u32 valid)
3524 {
3525 struct ifa_cacheinfo ci;
3526
3527 ci.cstamp = cstamp_delta(cstamp);
3528 ci.tstamp = cstamp_delta(tstamp);
3529 ci.ifa_prefered = preferred;
3530 ci.ifa_valid = valid;
3531
3532 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3533 }
3534
3535 static inline int rt_scope(int ifa_scope)
3536 {
3537 if (ifa_scope & IFA_HOST)
3538 return RT_SCOPE_HOST;
3539 else if (ifa_scope & IFA_LINK)
3540 return RT_SCOPE_LINK;
3541 else if (ifa_scope & IFA_SITE)
3542 return RT_SCOPE_SITE;
3543 else
3544 return RT_SCOPE_UNIVERSE;
3545 }
3546
3547 static inline int inet6_ifaddr_msgsize(void)
3548 {
3549 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3550 + nla_total_size(16) /* IFA_ADDRESS */
3551 + nla_total_size(sizeof(struct ifa_cacheinfo));
3552 }
3553
3554 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3555 u32 pid, u32 seq, int event, unsigned int flags)
3556 {
3557 struct nlmsghdr *nlh;
3558 u32 preferred, valid;
3559
3560 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3561 if (nlh == NULL)
3562 return -EMSGSIZE;
3563
3564 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3565 ifa->idev->dev->ifindex);
3566
3567 if (!(ifa->flags&IFA_F_PERMANENT)) {
3568 preferred = ifa->prefered_lft;
3569 valid = ifa->valid_lft;
3570 if (preferred != INFINITY_LIFE_TIME) {
3571 long tval = (jiffies - ifa->tstamp)/HZ;
3572 if (preferred > tval)
3573 preferred -= tval;
3574 else
3575 preferred = 0;
3576 if (valid != INFINITY_LIFE_TIME) {
3577 if (valid > tval)
3578 valid -= tval;
3579 else
3580 valid = 0;
3581 }
3582 }
3583 } else {
3584 preferred = INFINITY_LIFE_TIME;
3585 valid = INFINITY_LIFE_TIME;
3586 }
3587
3588 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3589 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3590 nlmsg_cancel(skb, nlh);
3591 return -EMSGSIZE;
3592 }
3593
3594 return nlmsg_end(skb, nlh);
3595 }
3596
3597 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3598 u32 pid, u32 seq, int event, u16 flags)
3599 {
3600 struct nlmsghdr *nlh;
3601 u8 scope = RT_SCOPE_UNIVERSE;
3602 int ifindex = ifmca->idev->dev->ifindex;
3603
3604 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3605 scope = RT_SCOPE_SITE;
3606
3607 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3608 if (nlh == NULL)
3609 return -EMSGSIZE;
3610
3611 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3612 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3613 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3614 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3615 nlmsg_cancel(skb, nlh);
3616 return -EMSGSIZE;
3617 }
3618
3619 return nlmsg_end(skb, nlh);
3620 }
3621
3622 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3623 u32 pid, u32 seq, int event, unsigned int flags)
3624 {
3625 struct nlmsghdr *nlh;
3626 u8 scope = RT_SCOPE_UNIVERSE;
3627 int ifindex = ifaca->aca_idev->dev->ifindex;
3628
3629 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3630 scope = RT_SCOPE_SITE;
3631
3632 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3633 if (nlh == NULL)
3634 return -EMSGSIZE;
3635
3636 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3637 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3638 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3639 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3640 nlmsg_cancel(skb, nlh);
3641 return -EMSGSIZE;
3642 }
3643
3644 return nlmsg_end(skb, nlh);
3645 }
3646
3647 enum addr_type_t {
3648 UNICAST_ADDR,
3649 MULTICAST_ADDR,
3650 ANYCAST_ADDR,
3651 };
3652
3653 /* called with rcu_read_lock() */
3654 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3655 struct netlink_callback *cb, enum addr_type_t type,
3656 int s_ip_idx, int *p_ip_idx)
3657 {
3658 struct ifmcaddr6 *ifmca;
3659 struct ifacaddr6 *ifaca;
3660 int err = 1;
3661 int ip_idx = *p_ip_idx;
3662
3663 read_lock_bh(&idev->lock);
3664 switch (type) {
3665 case UNICAST_ADDR: {
3666 struct inet6_ifaddr *ifa;
3667
3668 /* unicast address incl. temp addr */
3669 list_for_each_entry(ifa, &idev->addr_list, if_list) {
3670 if (++ip_idx < s_ip_idx)
3671 continue;
3672 err = inet6_fill_ifaddr(skb, ifa,
3673 NETLINK_CB(cb->skb).pid,
3674 cb->nlh->nlmsg_seq,
3675 RTM_NEWADDR,
3676 NLM_F_MULTI);
3677 if (err <= 0)
3678 break;
3679 }
3680 break;
3681 }
3682 case MULTICAST_ADDR:
3683 /* multicast address */
3684 for (ifmca = idev->mc_list; ifmca;
3685 ifmca = ifmca->next, ip_idx++) {
3686 if (ip_idx < s_ip_idx)
3687 continue;
3688 err = inet6_fill_ifmcaddr(skb, ifmca,
3689 NETLINK_CB(cb->skb).pid,
3690 cb->nlh->nlmsg_seq,
3691 RTM_GETMULTICAST,
3692 NLM_F_MULTI);
3693 if (err <= 0)
3694 break;
3695 }
3696 break;
3697 case ANYCAST_ADDR:
3698 /* anycast address */
3699 for (ifaca = idev->ac_list; ifaca;
3700 ifaca = ifaca->aca_next, ip_idx++) {
3701 if (ip_idx < s_ip_idx)
3702 continue;
3703 err = inet6_fill_ifacaddr(skb, ifaca,
3704 NETLINK_CB(cb->skb).pid,
3705 cb->nlh->nlmsg_seq,
3706 RTM_GETANYCAST,
3707 NLM_F_MULTI);
3708 if (err <= 0)
3709 break;
3710 }
3711 break;
3712 default:
3713 break;
3714 }
3715 read_unlock_bh(&idev->lock);
3716 *p_ip_idx = ip_idx;
3717 return err;
3718 }
3719
3720 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3721 enum addr_type_t type)
3722 {
3723 struct net *net = sock_net(skb->sk);
3724 int h, s_h;
3725 int idx, ip_idx;
3726 int s_idx, s_ip_idx;
3727 struct net_device *dev;
3728 struct inet6_dev *idev;
3729 struct hlist_head *head;
3730 struct hlist_node *node;
3731
3732 s_h = cb->args[0];
3733 s_idx = idx = cb->args[1];
3734 s_ip_idx = ip_idx = cb->args[2];
3735
3736 rcu_read_lock();
3737 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3738 idx = 0;
3739 head = &net->dev_index_head[h];
3740 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3741 if (idx < s_idx)
3742 goto cont;
3743 if (h > s_h || idx > s_idx)
3744 s_ip_idx = 0;
3745 ip_idx = 0;
3746 idev = __in6_dev_get(dev);
3747 if (!idev)
3748 goto cont;
3749
3750 if (in6_dump_addrs(idev, skb, cb, type,
3751 s_ip_idx, &ip_idx) <= 0)
3752 goto done;
3753 cont:
3754 idx++;
3755 }
3756 }
3757 done:
3758 rcu_read_unlock();
3759 cb->args[0] = h;
3760 cb->args[1] = idx;
3761 cb->args[2] = ip_idx;
3762
3763 return skb->len;
3764 }
3765
3766 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3767 {
3768 enum addr_type_t type = UNICAST_ADDR;
3769
3770 return inet6_dump_addr(skb, cb, type);
3771 }
3772
3773 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3774 {
3775 enum addr_type_t type = MULTICAST_ADDR;
3776
3777 return inet6_dump_addr(skb, cb, type);
3778 }
3779
3780
3781 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3782 {
3783 enum addr_type_t type = ANYCAST_ADDR;
3784
3785 return inet6_dump_addr(skb, cb, type);
3786 }
3787
3788 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3789 void *arg)
3790 {
3791 struct net *net = sock_net(in_skb->sk);
3792 struct ifaddrmsg *ifm;
3793 struct nlattr *tb[IFA_MAX+1];
3794 struct in6_addr *addr = NULL;
3795 struct net_device *dev = NULL;
3796 struct inet6_ifaddr *ifa;
3797 struct sk_buff *skb;
3798 int err;
3799
3800 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3801 if (err < 0)
3802 goto errout;
3803
3804 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3805 if (addr == NULL) {
3806 err = -EINVAL;
3807 goto errout;
3808 }
3809
3810 ifm = nlmsg_data(nlh);
3811 if (ifm->ifa_index)
3812 dev = __dev_get_by_index(net, ifm->ifa_index);
3813
3814 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
3815 if (!ifa) {
3816 err = -EADDRNOTAVAIL;
3817 goto errout;
3818 }
3819
3820 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
3821 if (!skb) {
3822 err = -ENOBUFS;
3823 goto errout_ifa;
3824 }
3825
3826 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3827 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3828 if (err < 0) {
3829 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3830 WARN_ON(err == -EMSGSIZE);
3831 kfree_skb(skb);
3832 goto errout_ifa;
3833 }
3834 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
3835 errout_ifa:
3836 in6_ifa_put(ifa);
3837 errout:
3838 return err;
3839 }
3840
3841 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3842 {
3843 struct sk_buff *skb;
3844 struct net *net = dev_net(ifa->idev->dev);
3845 int err = -ENOBUFS;
3846
3847 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3848 if (skb == NULL)
3849 goto errout;
3850
3851 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3852 if (err < 0) {
3853 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3854 WARN_ON(err == -EMSGSIZE);
3855 kfree_skb(skb);
3856 goto errout;
3857 }
3858 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3859 return;
3860 errout:
3861 if (err < 0)
3862 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3863 }
3864
3865 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3866 __s32 *array, int bytes)
3867 {
3868 BUG_ON(bytes < (DEVCONF_MAX * 4));
3869
3870 memset(array, 0, bytes);
3871 array[DEVCONF_FORWARDING] = cnf->forwarding;
3872 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3873 array[DEVCONF_MTU6] = cnf->mtu6;
3874 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3875 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3876 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3877 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3878 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3879 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
3880 jiffies_to_msecs(cnf->rtr_solicit_interval);
3881 array[DEVCONF_RTR_SOLICIT_DELAY] =
3882 jiffies_to_msecs(cnf->rtr_solicit_delay);
3883 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3884 #ifdef CONFIG_IPV6_PRIVACY
3885 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3886 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3887 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3888 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3889 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3890 #endif
3891 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3892 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3893 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3894 #ifdef CONFIG_IPV6_ROUTER_PREF
3895 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3896 array[DEVCONF_RTR_PROBE_INTERVAL] =
3897 jiffies_to_msecs(cnf->rtr_probe_interval);
3898 #ifdef CONFIG_IPV6_ROUTE_INFO
3899 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3900 #endif
3901 #endif
3902 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3903 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3904 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3905 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3906 #endif
3907 #ifdef CONFIG_IPV6_MROUTE
3908 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
3909 #endif
3910 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
3911 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
3912 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
3913 }
3914
3915 static inline size_t inet6_ifla6_size(void)
3916 {
3917 return nla_total_size(4) /* IFLA_INET6_FLAGS */
3918 + nla_total_size(sizeof(struct ifla_cacheinfo))
3919 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3920 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3921 + nla_total_size(ICMP6_MIB_MAX * 8); /* IFLA_INET6_ICMP6STATS */
3922 }
3923
3924 static inline size_t inet6_if_nlmsg_size(void)
3925 {
3926 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3927 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3928 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3929 + nla_total_size(4) /* IFLA_MTU */
3930 + nla_total_size(4) /* IFLA_LINK */
3931 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
3932 }
3933
3934 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
3935 int items, int bytes)
3936 {
3937 int i;
3938 int pad = bytes - sizeof(u64) * items;
3939 BUG_ON(pad < 0);
3940
3941 /* Use put_unaligned() because stats may not be aligned for u64. */
3942 put_unaligned(items, &stats[0]);
3943 for (i = 1; i < items; i++)
3944 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
3945
3946 memset(&stats[items], 0, pad);
3947 }
3948
3949 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib,
3950 int items, int bytes, size_t syncpoff)
3951 {
3952 int i;
3953 int pad = bytes - sizeof(u64) * items;
3954 BUG_ON(pad < 0);
3955
3956 /* Use put_unaligned() because stats may not be aligned for u64. */
3957 put_unaligned(items, &stats[0]);
3958 for (i = 1; i < items; i++)
3959 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
3960
3961 memset(&stats[items], 0, pad);
3962 }
3963
3964 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3965 int bytes)
3966 {
3967 switch (attrtype) {
3968 case IFLA_INET6_STATS:
3969 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6,
3970 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
3971 break;
3972 case IFLA_INET6_ICMP6STATS:
3973 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
3974 break;
3975 }
3976 }
3977
3978 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
3979 {
3980 struct nlattr *nla;
3981 struct ifla_cacheinfo ci;
3982
3983 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
3984
3985 ci.max_reasm_len = IPV6_MAXPLEN;
3986 ci.tstamp = cstamp_delta(idev->tstamp);
3987 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
3988 ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time);
3989 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3990
3991 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3992 if (nla == NULL)
3993 goto nla_put_failure;
3994 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
3995
3996 /* XXX - MC not implemented */
3997
3998 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3999 if (nla == NULL)
4000 goto nla_put_failure;
4001 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4002
4003 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4004 if (nla == NULL)
4005 goto nla_put_failure;
4006 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4007
4008 return 0;
4009
4010 nla_put_failure:
4011 return -EMSGSIZE;
4012 }
4013
4014 static size_t inet6_get_link_af_size(const struct net_device *dev)
4015 {
4016 if (!__in6_dev_get(dev))
4017 return 0;
4018
4019 return inet6_ifla6_size();
4020 }
4021
4022 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
4023 {
4024 struct inet6_dev *idev = __in6_dev_get(dev);
4025
4026 if (!idev)
4027 return -ENODATA;
4028
4029 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4030 return -EMSGSIZE;
4031
4032 return 0;
4033 }
4034
4035 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
4036 u32 pid, u32 seq, int event, unsigned int flags)
4037 {
4038 struct net_device *dev = idev->dev;
4039 struct ifinfomsg *hdr;
4040 struct nlmsghdr *nlh;
4041 void *protoinfo;
4042
4043 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
4044 if (nlh == NULL)
4045 return -EMSGSIZE;
4046
4047 hdr = nlmsg_data(nlh);
4048 hdr->ifi_family = AF_INET6;
4049 hdr->__ifi_pad = 0;
4050 hdr->ifi_type = dev->type;
4051 hdr->ifi_index = dev->ifindex;
4052 hdr->ifi_flags = dev_get_flags(dev);
4053 hdr->ifi_change = 0;
4054
4055 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
4056
4057 if (dev->addr_len)
4058 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
4059
4060 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
4061 if (dev->ifindex != dev->iflink)
4062 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
4063
4064 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4065 if (protoinfo == NULL)
4066 goto nla_put_failure;
4067
4068 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4069 goto nla_put_failure;
4070
4071 nla_nest_end(skb, protoinfo);
4072 return nlmsg_end(skb, nlh);
4073
4074 nla_put_failure:
4075 nlmsg_cancel(skb, nlh);
4076 return -EMSGSIZE;
4077 }
4078
4079 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4080 {
4081 struct net *net = sock_net(skb->sk);
4082 int h, s_h;
4083 int idx = 0, s_idx;
4084 struct net_device *dev;
4085 struct inet6_dev *idev;
4086 struct hlist_head *head;
4087 struct hlist_node *node;
4088
4089 s_h = cb->args[0];
4090 s_idx = cb->args[1];
4091
4092 rcu_read_lock();
4093 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4094 idx = 0;
4095 head = &net->dev_index_head[h];
4096 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
4097 if (idx < s_idx)
4098 goto cont;
4099 idev = __in6_dev_get(dev);
4100 if (!idev)
4101 goto cont;
4102 if (inet6_fill_ifinfo(skb, idev,
4103 NETLINK_CB(cb->skb).pid,
4104 cb->nlh->nlmsg_seq,
4105 RTM_NEWLINK, NLM_F_MULTI) <= 0)
4106 goto out;
4107 cont:
4108 idx++;
4109 }
4110 }
4111 out:
4112 rcu_read_unlock();
4113 cb->args[1] = idx;
4114 cb->args[0] = h;
4115
4116 return skb->len;
4117 }
4118
4119 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4120 {
4121 struct sk_buff *skb;
4122 struct net *net = dev_net(idev->dev);
4123 int err = -ENOBUFS;
4124
4125 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
4126 if (skb == NULL)
4127 goto errout;
4128
4129 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
4130 if (err < 0) {
4131 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4132 WARN_ON(err == -EMSGSIZE);
4133 kfree_skb(skb);
4134 goto errout;
4135 }
4136 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
4137 return;
4138 errout:
4139 if (err < 0)
4140 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
4141 }
4142
4143 static inline size_t inet6_prefix_nlmsg_size(void)
4144 {
4145 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4146 + nla_total_size(sizeof(struct in6_addr))
4147 + nla_total_size(sizeof(struct prefix_cacheinfo));
4148 }
4149
4150 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
4151 struct prefix_info *pinfo, u32 pid, u32 seq,
4152 int event, unsigned int flags)
4153 {
4154 struct prefixmsg *pmsg;
4155 struct nlmsghdr *nlh;
4156 struct prefix_cacheinfo ci;
4157
4158 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
4159 if (nlh == NULL)
4160 return -EMSGSIZE;
4161
4162 pmsg = nlmsg_data(nlh);
4163 pmsg->prefix_family = AF_INET6;
4164 pmsg->prefix_pad1 = 0;
4165 pmsg->prefix_pad2 = 0;
4166 pmsg->prefix_ifindex = idev->dev->ifindex;
4167 pmsg->prefix_len = pinfo->prefix_len;
4168 pmsg->prefix_type = pinfo->type;
4169 pmsg->prefix_pad3 = 0;
4170 pmsg->prefix_flags = 0;
4171 if (pinfo->onlink)
4172 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4173 if (pinfo->autoconf)
4174 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4175
4176 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
4177
4178 ci.preferred_time = ntohl(pinfo->prefered);
4179 ci.valid_time = ntohl(pinfo->valid);
4180 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
4181
4182 return nlmsg_end(skb, nlh);
4183
4184 nla_put_failure:
4185 nlmsg_cancel(skb, nlh);
4186 return -EMSGSIZE;
4187 }
4188
4189 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
4190 struct prefix_info *pinfo)
4191 {
4192 struct sk_buff *skb;
4193 struct net *net = dev_net(idev->dev);
4194 int err = -ENOBUFS;
4195
4196 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
4197 if (skb == NULL)
4198 goto errout;
4199
4200 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
4201 if (err < 0) {
4202 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4203 WARN_ON(err == -EMSGSIZE);
4204 kfree_skb(skb);
4205 goto errout;
4206 }
4207 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4208 return;
4209 errout:
4210 if (err < 0)
4211 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
4212 }
4213
4214 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4215 {
4216 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4217
4218 switch (event) {
4219 case RTM_NEWADDR:
4220 /*
4221 * If the address was optimistic
4222 * we inserted the route at the start of
4223 * our DAD process, so we don't need
4224 * to do it again
4225 */
4226 if (!(ifp->rt->rt6i_node))
4227 ip6_ins_rt(ifp->rt);
4228 if (ifp->idev->cnf.forwarding)
4229 addrconf_join_anycast(ifp);
4230 break;
4231 case RTM_DELADDR:
4232 if (ifp->idev->cnf.forwarding)
4233 addrconf_leave_anycast(ifp);
4234 addrconf_leave_solict(ifp->idev, &ifp->addr);
4235 dst_hold(&ifp->rt->dst);
4236
4237 if (ip6_del_rt(ifp->rt))
4238 dst_free(&ifp->rt->dst);
4239 break;
4240 }
4241 }
4242
4243 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4244 {
4245 rcu_read_lock_bh();
4246 if (likely(ifp->idev->dead == 0))
4247 __ipv6_ifa_notify(event, ifp);
4248 rcu_read_unlock_bh();
4249 }
4250
4251 #ifdef CONFIG_SYSCTL
4252
4253 static
4254 int addrconf_sysctl_forward(ctl_table *ctl, int write,
4255 void __user *buffer, size_t *lenp, loff_t *ppos)
4256 {
4257 int *valp = ctl->data;
4258 int val = *valp;
4259 loff_t pos = *ppos;
4260 int ret;
4261
4262 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
4263
4264 if (write)
4265 ret = addrconf_fixup_forwarding(ctl, valp, val);
4266 if (ret)
4267 *ppos = pos;
4268 return ret;
4269 }
4270
4271 static void dev_disable_change(struct inet6_dev *idev)
4272 {
4273 if (!idev || !idev->dev)
4274 return;
4275
4276 if (idev->cnf.disable_ipv6)
4277 addrconf_notify(NULL, NETDEV_DOWN, idev->dev);
4278 else
4279 addrconf_notify(NULL, NETDEV_UP, idev->dev);
4280 }
4281
4282 static void addrconf_disable_change(struct net *net, __s32 newf)
4283 {
4284 struct net_device *dev;
4285 struct inet6_dev *idev;
4286
4287 rcu_read_lock();
4288 for_each_netdev_rcu(net, dev) {
4289 idev = __in6_dev_get(dev);
4290 if (idev) {
4291 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4292 idev->cnf.disable_ipv6 = newf;
4293 if (changed)
4294 dev_disable_change(idev);
4295 }
4296 }
4297 rcu_read_unlock();
4298 }
4299
4300 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int old)
4301 {
4302 struct net *net;
4303
4304 net = (struct net *)table->extra2;
4305
4306 if (p == &net->ipv6.devconf_dflt->disable_ipv6)
4307 return 0;
4308
4309 if (!rtnl_trylock()) {
4310 /* Restore the original values before restarting */
4311 *p = old;
4312 return restart_syscall();
4313 }
4314
4315 if (p == &net->ipv6.devconf_all->disable_ipv6) {
4316 __s32 newf = net->ipv6.devconf_all->disable_ipv6;
4317 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4318 addrconf_disable_change(net, newf);
4319 } else if ((!*p) ^ (!old))
4320 dev_disable_change((struct inet6_dev *)table->extra1);
4321
4322 rtnl_unlock();
4323 return 0;
4324 }
4325
4326 static
4327 int addrconf_sysctl_disable(ctl_table *ctl, int write,
4328 void __user *buffer, size_t *lenp, loff_t *ppos)
4329 {
4330 int *valp = ctl->data;
4331 int val = *valp;
4332 loff_t pos = *ppos;
4333 int ret;
4334
4335 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
4336
4337 if (write)
4338 ret = addrconf_disable_ipv6(ctl, valp, val);
4339 if (ret)
4340 *ppos = pos;
4341 return ret;
4342 }
4343
4344 static struct addrconf_sysctl_table
4345 {
4346 struct ctl_table_header *sysctl_header;
4347 ctl_table addrconf_vars[DEVCONF_MAX+1];
4348 char *dev_name;
4349 } addrconf_sysctl __read_mostly = {
4350 .sysctl_header = NULL,
4351 .addrconf_vars = {
4352 {
4353 .procname = "forwarding",
4354 .data = &ipv6_devconf.forwarding,
4355 .maxlen = sizeof(int),
4356 .mode = 0644,
4357 .proc_handler = addrconf_sysctl_forward,
4358 },
4359 {
4360 .procname = "hop_limit",
4361 .data = &ipv6_devconf.hop_limit,
4362 .maxlen = sizeof(int),
4363 .mode = 0644,
4364 .proc_handler = proc_dointvec,
4365 },
4366 {
4367 .procname = "mtu",
4368 .data = &ipv6_devconf.mtu6,
4369 .maxlen = sizeof(int),
4370 .mode = 0644,
4371 .proc_handler = proc_dointvec,
4372 },
4373 {
4374 .procname = "accept_ra",
4375 .data = &ipv6_devconf.accept_ra,
4376 .maxlen = sizeof(int),
4377 .mode = 0644,
4378 .proc_handler = proc_dointvec,
4379 },
4380 {
4381 .procname = "accept_redirects",
4382 .data = &ipv6_devconf.accept_redirects,
4383 .maxlen = sizeof(int),
4384 .mode = 0644,
4385 .proc_handler = proc_dointvec,
4386 },
4387 {
4388 .procname = "autoconf",
4389 .data = &ipv6_devconf.autoconf,
4390 .maxlen = sizeof(int),
4391 .mode = 0644,
4392 .proc_handler = proc_dointvec,
4393 },
4394 {
4395 .procname = "dad_transmits",
4396 .data = &ipv6_devconf.dad_transmits,
4397 .maxlen = sizeof(int),
4398 .mode = 0644,
4399 .proc_handler = proc_dointvec,
4400 },
4401 {
4402 .procname = "router_solicitations",
4403 .data = &ipv6_devconf.rtr_solicits,
4404 .maxlen = sizeof(int),
4405 .mode = 0644,
4406 .proc_handler = proc_dointvec,
4407 },
4408 {
4409 .procname = "router_solicitation_interval",
4410 .data = &ipv6_devconf.rtr_solicit_interval,
4411 .maxlen = sizeof(int),
4412 .mode = 0644,
4413 .proc_handler = proc_dointvec_jiffies,
4414 },
4415 {
4416 .procname = "router_solicitation_delay",
4417 .data = &ipv6_devconf.rtr_solicit_delay,
4418 .maxlen = sizeof(int),
4419 .mode = 0644,
4420 .proc_handler = proc_dointvec_jiffies,
4421 },
4422 {
4423 .procname = "force_mld_version",
4424 .data = &ipv6_devconf.force_mld_version,
4425 .maxlen = sizeof(int),
4426 .mode = 0644,
4427 .proc_handler = proc_dointvec,
4428 },
4429 #ifdef CONFIG_IPV6_PRIVACY
4430 {
4431 .procname = "use_tempaddr",
4432 .data = &ipv6_devconf.use_tempaddr,
4433 .maxlen = sizeof(int),
4434 .mode = 0644,
4435 .proc_handler = proc_dointvec,
4436 },
4437 {
4438 .procname = "temp_valid_lft",
4439 .data = &ipv6_devconf.temp_valid_lft,
4440 .maxlen = sizeof(int),
4441 .mode = 0644,
4442 .proc_handler = proc_dointvec,
4443 },
4444 {
4445 .procname = "temp_prefered_lft",
4446 .data = &ipv6_devconf.temp_prefered_lft,
4447 .maxlen = sizeof(int),
4448 .mode = 0644,
4449 .proc_handler = proc_dointvec,
4450 },
4451 {
4452 .procname = "regen_max_retry",
4453 .data = &ipv6_devconf.regen_max_retry,
4454 .maxlen = sizeof(int),
4455 .mode = 0644,
4456 .proc_handler = proc_dointvec,
4457 },
4458 {
4459 .procname = "max_desync_factor",
4460 .data = &ipv6_devconf.max_desync_factor,
4461 .maxlen = sizeof(int),
4462 .mode = 0644,
4463 .proc_handler = proc_dointvec,
4464 },
4465 #endif
4466 {
4467 .procname = "max_addresses",
4468 .data = &ipv6_devconf.max_addresses,
4469 .maxlen = sizeof(int),
4470 .mode = 0644,
4471 .proc_handler = proc_dointvec,
4472 },
4473 {
4474 .procname = "accept_ra_defrtr",
4475 .data = &ipv6_devconf.accept_ra_defrtr,
4476 .maxlen = sizeof(int),
4477 .mode = 0644,
4478 .proc_handler = proc_dointvec,
4479 },
4480 {
4481 .procname = "accept_ra_pinfo",
4482 .data = &ipv6_devconf.accept_ra_pinfo,
4483 .maxlen = sizeof(int),
4484 .mode = 0644,
4485 .proc_handler = proc_dointvec,
4486 },
4487 #ifdef CONFIG_IPV6_ROUTER_PREF
4488 {
4489 .procname = "accept_ra_rtr_pref",
4490 .data = &ipv6_devconf.accept_ra_rtr_pref,
4491 .maxlen = sizeof(int),
4492 .mode = 0644,
4493 .proc_handler = proc_dointvec,
4494 },
4495 {
4496 .procname = "router_probe_interval",
4497 .data = &ipv6_devconf.rtr_probe_interval,
4498 .maxlen = sizeof(int),
4499 .mode = 0644,
4500 .proc_handler = proc_dointvec_jiffies,
4501 },
4502 #ifdef CONFIG_IPV6_ROUTE_INFO
4503 {
4504 .procname = "accept_ra_rt_info_max_plen",
4505 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4506 .maxlen = sizeof(int),
4507 .mode = 0644,
4508 .proc_handler = proc_dointvec,
4509 },
4510 #endif
4511 #endif
4512 {
4513 .procname = "proxy_ndp",
4514 .data = &ipv6_devconf.proxy_ndp,
4515 .maxlen = sizeof(int),
4516 .mode = 0644,
4517 .proc_handler = proc_dointvec,
4518 },
4519 {
4520 .procname = "accept_source_route",
4521 .data = &ipv6_devconf.accept_source_route,
4522 .maxlen = sizeof(int),
4523 .mode = 0644,
4524 .proc_handler = proc_dointvec,
4525 },
4526 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4527 {
4528 .procname = "optimistic_dad",
4529 .data = &ipv6_devconf.optimistic_dad,
4530 .maxlen = sizeof(int),
4531 .mode = 0644,
4532 .proc_handler = proc_dointvec,
4533
4534 },
4535 #endif
4536 #ifdef CONFIG_IPV6_MROUTE
4537 {
4538 .procname = "mc_forwarding",
4539 .data = &ipv6_devconf.mc_forwarding,
4540 .maxlen = sizeof(int),
4541 .mode = 0444,
4542 .proc_handler = proc_dointvec,
4543 },
4544 #endif
4545 {
4546 .procname = "disable_ipv6",
4547 .data = &ipv6_devconf.disable_ipv6,
4548 .maxlen = sizeof(int),
4549 .mode = 0644,
4550 .proc_handler = addrconf_sysctl_disable,
4551 },
4552 {
4553 .procname = "accept_dad",
4554 .data = &ipv6_devconf.accept_dad,
4555 .maxlen = sizeof(int),
4556 .mode = 0644,
4557 .proc_handler = proc_dointvec,
4558 },
4559 {
4560 .procname = "force_tllao",
4561 .data = &ipv6_devconf.force_tllao,
4562 .maxlen = sizeof(int),
4563 .mode = 0644,
4564 .proc_handler = proc_dointvec
4565 },
4566 {
4567 /* sentinel */
4568 }
4569 },
4570 };
4571
4572 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4573 struct inet6_dev *idev, struct ipv6_devconf *p)
4574 {
4575 int i;
4576 struct addrconf_sysctl_table *t;
4577
4578 #define ADDRCONF_CTL_PATH_DEV 3
4579
4580 struct ctl_path addrconf_ctl_path[] = {
4581 { .procname = "net", },
4582 { .procname = "ipv6", },
4583 { .procname = "conf", },
4584 { /* to be set */ },
4585 { },
4586 };
4587
4588
4589 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4590 if (t == NULL)
4591 goto out;
4592
4593 for (i = 0; t->addrconf_vars[i].data; i++) {
4594 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
4595 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4596 t->addrconf_vars[i].extra2 = net;
4597 }
4598
4599 /*
4600 * Make a copy of dev_name, because '.procname' is regarded as const
4601 * by sysctl and we wouldn't want anyone to change it under our feet
4602 * (see SIOCSIFNAME).
4603 */
4604 t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4605 if (!t->dev_name)
4606 goto free;
4607
4608 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
4609
4610 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
4611 t->addrconf_vars);
4612 if (t->sysctl_header == NULL)
4613 goto free_procname;
4614
4615 p->sysctl = t;
4616 return 0;
4617
4618 free_procname:
4619 kfree(t->dev_name);
4620 free:
4621 kfree(t);
4622 out:
4623 return -ENOBUFS;
4624 }
4625
4626 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4627 {
4628 struct addrconf_sysctl_table *t;
4629
4630 if (p->sysctl == NULL)
4631 return;
4632
4633 t = p->sysctl;
4634 p->sysctl = NULL;
4635 unregister_net_sysctl_table(t->sysctl_header);
4636 kfree(t->dev_name);
4637 kfree(t);
4638 }
4639
4640 static void addrconf_sysctl_register(struct inet6_dev *idev)
4641 {
4642 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
4643 &ndisc_ifinfo_sysctl_change);
4644 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
4645 idev, &idev->cnf);
4646 }
4647
4648 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
4649 {
4650 __addrconf_sysctl_unregister(&idev->cnf);
4651 neigh_sysctl_unregister(idev->nd_parms);
4652 }
4653
4654
4655 #endif
4656
4657 static int __net_init addrconf_init_net(struct net *net)
4658 {
4659 int err;
4660 struct ipv6_devconf *all, *dflt;
4661
4662 err = -ENOMEM;
4663 all = &ipv6_devconf;
4664 dflt = &ipv6_devconf_dflt;
4665
4666 if (!net_eq(net, &init_net)) {
4667 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4668 if (all == NULL)
4669 goto err_alloc_all;
4670
4671 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4672 if (dflt == NULL)
4673 goto err_alloc_dflt;
4674 } else {
4675 /* these will be inherited by all namespaces */
4676 dflt->autoconf = ipv6_defaults.autoconf;
4677 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
4678 }
4679
4680 net->ipv6.devconf_all = all;
4681 net->ipv6.devconf_dflt = dflt;
4682
4683 #ifdef CONFIG_SYSCTL
4684 err = __addrconf_sysctl_register(net, "all", NULL, all);
4685 if (err < 0)
4686 goto err_reg_all;
4687
4688 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
4689 if (err < 0)
4690 goto err_reg_dflt;
4691 #endif
4692 return 0;
4693
4694 #ifdef CONFIG_SYSCTL
4695 err_reg_dflt:
4696 __addrconf_sysctl_unregister(all);
4697 err_reg_all:
4698 kfree(dflt);
4699 #endif
4700 err_alloc_dflt:
4701 kfree(all);
4702 err_alloc_all:
4703 return err;
4704 }
4705
4706 static void __net_exit addrconf_exit_net(struct net *net)
4707 {
4708 #ifdef CONFIG_SYSCTL
4709 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4710 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4711 #endif
4712 if (!net_eq(net, &init_net)) {
4713 kfree(net->ipv6.devconf_dflt);
4714 kfree(net->ipv6.devconf_all);
4715 }
4716 }
4717
4718 static struct pernet_operations addrconf_ops = {
4719 .init = addrconf_init_net,
4720 .exit = addrconf_exit_net,
4721 };
4722
4723 /*
4724 * Device notifier
4725 */
4726
4727 int register_inet6addr_notifier(struct notifier_block *nb)
4728 {
4729 return atomic_notifier_chain_register(&inet6addr_chain, nb);
4730 }
4731 EXPORT_SYMBOL(register_inet6addr_notifier);
4732
4733 int unregister_inet6addr_notifier(struct notifier_block *nb)
4734 {
4735 return atomic_notifier_chain_unregister(&inet6addr_chain, nb);
4736 }
4737 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4738
4739 static struct rtnl_af_ops inet6_ops = {
4740 .family = AF_INET6,
4741 .fill_link_af = inet6_fill_link_af,
4742 .get_link_af_size = inet6_get_link_af_size,
4743 };
4744
4745 /*
4746 * Init / cleanup code
4747 */
4748
4749 int __init addrconf_init(void)
4750 {
4751 int i, err;
4752
4753 err = ipv6_addr_label_init();
4754 if (err < 0) {
4755 printk(KERN_CRIT "IPv6 Addrconf:"
4756 " cannot initialize default policy table: %d.\n", err);
4757 goto out;
4758 }
4759
4760 err = register_pernet_subsys(&addrconf_ops);
4761 if (err < 0)
4762 goto out_addrlabel;
4763
4764 /* The addrconf netdev notifier requires that loopback_dev
4765 * has it's ipv6 private information allocated and setup
4766 * before it can bring up and give link-local addresses
4767 * to other devices which are up.
4768 *
4769 * Unfortunately, loopback_dev is not necessarily the first
4770 * entry in the global dev_base list of net devices. In fact,
4771 * it is likely to be the very last entry on that list.
4772 * So this causes the notifier registry below to try and
4773 * give link-local addresses to all devices besides loopback_dev
4774 * first, then loopback_dev, which cases all the non-loopback_dev
4775 * devices to fail to get a link-local address.
4776 *
4777 * So, as a temporary fix, allocate the ipv6 structure for
4778 * loopback_dev first by hand.
4779 * Longer term, all of the dependencies ipv6 has upon the loopback
4780 * device and it being up should be removed.
4781 */
4782 rtnl_lock();
4783 if (!ipv6_add_dev(init_net.loopback_dev))
4784 err = -ENOMEM;
4785 rtnl_unlock();
4786 if (err)
4787 goto errlo;
4788
4789 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4790 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
4791
4792 register_netdevice_notifier(&ipv6_dev_notf);
4793
4794 addrconf_verify(0);
4795
4796 err = rtnl_af_register(&inet6_ops);
4797 if (err < 0)
4798 goto errout_af;
4799
4800 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
4801 NULL);
4802 if (err < 0)
4803 goto errout;
4804
4805 /* Only the first call to __rtnl_register can fail */
4806 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
4807 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
4808 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
4809 inet6_dump_ifaddr, NULL);
4810 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
4811 inet6_dump_ifmcaddr, NULL);
4812 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
4813 inet6_dump_ifacaddr, NULL);
4814
4815 ipv6_addr_label_rtnl_register();
4816
4817 return 0;
4818 errout:
4819 rtnl_af_unregister(&inet6_ops);
4820 errout_af:
4821 unregister_netdevice_notifier(&ipv6_dev_notf);
4822 errlo:
4823 unregister_pernet_subsys(&addrconf_ops);
4824 out_addrlabel:
4825 ipv6_addr_label_cleanup();
4826 out:
4827 return err;
4828 }
4829
4830 void addrconf_cleanup(void)
4831 {
4832 struct net_device *dev;
4833 int i;
4834
4835 unregister_netdevice_notifier(&ipv6_dev_notf);
4836 unregister_pernet_subsys(&addrconf_ops);
4837 ipv6_addr_label_cleanup();
4838
4839 rtnl_lock();
4840
4841 __rtnl_af_unregister(&inet6_ops);
4842
4843 /* clean dev list */
4844 for_each_netdev(&init_net, dev) {
4845 if (__in6_dev_get(dev) == NULL)
4846 continue;
4847 addrconf_ifdown(dev, 1);
4848 }
4849 addrconf_ifdown(init_net.loopback_dev, 2);
4850
4851 /*
4852 * Check hash table.
4853 */
4854 spin_lock_bh(&addrconf_hash_lock);
4855 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4856 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
4857 spin_unlock_bh(&addrconf_hash_lock);
4858
4859 del_timer(&addr_chk_timer);
4860 rtnl_unlock();
4861 }
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree