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Merge tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi
[deliverable/linux.git] / net / ipv6 / addrconf.c
1 /*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 */
14
15 /*
16 * Changes:
17 *
18 * Janos Farkas : delete timer on ifdown
19 * <chexum@bankinf.banki.hu>
20 * Andi Kleen : kill double kfree on module
21 * unload.
22 * Maciej W. Rozycki : FDDI support
23 * sekiya@USAGI : Don't send too many RS
24 * packets.
25 * yoshfuji@USAGI : Fixed interval between DAD
26 * packets.
27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
28 * address validation timer.
29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
30 * support.
31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
32 * address on a same interface.
33 * YOSHIFUJI Hideaki @USAGI : ARCnet support
34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
35 * seq_file.
36 * YOSHIFUJI Hideaki @USAGI : improved source address
37 * selection; consider scope,
38 * status etc.
39 */
40
41 #include <linux/errno.h>
42 #include <linux/types.h>
43 #include <linux/kernel.h>
44 #include <linux/socket.h>
45 #include <linux/sockios.h>
46 #include <linux/net.h>
47 #include <linux/in6.h>
48 #include <linux/netdevice.h>
49 #include <linux/if_addr.h>
50 #include <linux/if_arp.h>
51 #include <linux/if_arcnet.h>
52 #include <linux/if_infiniband.h>
53 #include <linux/route.h>
54 #include <linux/inetdevice.h>
55 #include <linux/init.h>
56 #include <linux/slab.h>
57 #ifdef CONFIG_SYSCTL
58 #include <linux/sysctl.h>
59 #endif
60 #include <linux/capability.h>
61 #include <linux/delay.h>
62 #include <linux/notifier.h>
63 #include <linux/string.h>
64
65 #include <net/net_namespace.h>
66 #include <net/sock.h>
67 #include <net/snmp.h>
68
69 #include <net/ipv6.h>
70 #include <net/protocol.h>
71 #include <net/ndisc.h>
72 #include <net/ip6_route.h>
73 #include <net/addrconf.h>
74 #include <net/tcp.h>
75 #include <net/ip.h>
76 #include <net/netlink.h>
77 #include <net/pkt_sched.h>
78 #include <linux/if_tunnel.h>
79 #include <linux/rtnetlink.h>
80
81 #ifdef CONFIG_IPV6_PRIVACY
82 #include <linux/random.h>
83 #endif
84
85 #include <linux/uaccess.h>
86 #include <asm/unaligned.h>
87
88 #include <linux/proc_fs.h>
89 #include <linux/seq_file.h>
90 #include <linux/export.h>
91
92 /* Set to 3 to get tracing... */
93 #define ACONF_DEBUG 2
94
95 #if ACONF_DEBUG >= 3
96 #define ADBG(x) printk x
97 #else
98 #define ADBG(x)
99 #endif
100
101 #define INFINITY_LIFE_TIME 0xFFFFFFFF
102
103 static inline u32 cstamp_delta(unsigned long cstamp)
104 {
105 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
106 }
107
108 #define ADDRCONF_TIMER_FUZZ_MINUS (HZ > 50 ? HZ/50 : 1)
109 #define ADDRCONF_TIMER_FUZZ (HZ / 4)
110 #define ADDRCONF_TIMER_FUZZ_MAX (HZ)
111
112 #ifdef CONFIG_SYSCTL
113 static void addrconf_sysctl_register(struct inet6_dev *idev);
114 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
115 #else
116 static inline void addrconf_sysctl_register(struct inet6_dev *idev)
117 {
118 }
119
120 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
121 {
122 }
123 #endif
124
125 #ifdef CONFIG_IPV6_PRIVACY
126 static int __ipv6_regen_rndid(struct inet6_dev *idev);
127 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
128 static void ipv6_regen_rndid(unsigned long data);
129 #endif
130
131 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
132 static int ipv6_count_addresses(struct inet6_dev *idev);
133
134 /*
135 * Configured unicast address hash table
136 */
137 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
138 static DEFINE_SPINLOCK(addrconf_hash_lock);
139
140 static void addrconf_verify(unsigned long);
141
142 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
143 static DEFINE_SPINLOCK(addrconf_verify_lock);
144
145 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
146 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
147
148 static void addrconf_type_change(struct net_device *dev,
149 unsigned long event);
150 static int addrconf_ifdown(struct net_device *dev, int how);
151
152 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
153 static void addrconf_dad_timer(unsigned long data);
154 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
155 static void addrconf_dad_run(struct inet6_dev *idev);
156 static void addrconf_rs_timer(unsigned long data);
157 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
158 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
159
160 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
161 struct prefix_info *pinfo);
162 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
163 struct net_device *dev);
164
165 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
166
167 static struct ipv6_devconf ipv6_devconf __read_mostly = {
168 .forwarding = 0,
169 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
170 .mtu6 = IPV6_MIN_MTU,
171 .accept_ra = 1,
172 .accept_redirects = 1,
173 .autoconf = 1,
174 .force_mld_version = 0,
175 .dad_transmits = 1,
176 .rtr_solicits = MAX_RTR_SOLICITATIONS,
177 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
178 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
179 #ifdef CONFIG_IPV6_PRIVACY
180 .use_tempaddr = 0,
181 .temp_valid_lft = TEMP_VALID_LIFETIME,
182 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
183 .regen_max_retry = REGEN_MAX_RETRY,
184 .max_desync_factor = MAX_DESYNC_FACTOR,
185 #endif
186 .max_addresses = IPV6_MAX_ADDRESSES,
187 .accept_ra_defrtr = 1,
188 .accept_ra_pinfo = 1,
189 #ifdef CONFIG_IPV6_ROUTER_PREF
190 .accept_ra_rtr_pref = 1,
191 .rtr_probe_interval = 60 * HZ,
192 #ifdef CONFIG_IPV6_ROUTE_INFO
193 .accept_ra_rt_info_max_plen = 0,
194 #endif
195 #endif
196 .proxy_ndp = 0,
197 .accept_source_route = 0, /* we do not accept RH0 by default. */
198 .disable_ipv6 = 0,
199 .accept_dad = 1,
200 };
201
202 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
203 .forwarding = 0,
204 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
205 .mtu6 = IPV6_MIN_MTU,
206 .accept_ra = 1,
207 .accept_redirects = 1,
208 .autoconf = 1,
209 .dad_transmits = 1,
210 .rtr_solicits = MAX_RTR_SOLICITATIONS,
211 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
212 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
213 #ifdef CONFIG_IPV6_PRIVACY
214 .use_tempaddr = 0,
215 .temp_valid_lft = TEMP_VALID_LIFETIME,
216 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
217 .regen_max_retry = REGEN_MAX_RETRY,
218 .max_desync_factor = MAX_DESYNC_FACTOR,
219 #endif
220 .max_addresses = IPV6_MAX_ADDRESSES,
221 .accept_ra_defrtr = 1,
222 .accept_ra_pinfo = 1,
223 #ifdef CONFIG_IPV6_ROUTER_PREF
224 .accept_ra_rtr_pref = 1,
225 .rtr_probe_interval = 60 * HZ,
226 #ifdef CONFIG_IPV6_ROUTE_INFO
227 .accept_ra_rt_info_max_plen = 0,
228 #endif
229 #endif
230 .proxy_ndp = 0,
231 .accept_source_route = 0, /* we do not accept RH0 by default. */
232 .disable_ipv6 = 0,
233 .accept_dad = 1,
234 };
235
236 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
237 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
238 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
239 const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
240 const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
241
242 /* Check if a valid qdisc is available */
243 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
244 {
245 return !qdisc_tx_is_noop(dev);
246 }
247
248 /* Check if a route is valid prefix route */
249 static inline int addrconf_is_prefix_route(const struct rt6_info *rt)
250 {
251 return (rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0;
252 }
253
254 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
255 {
256 if (del_timer(&ifp->timer))
257 __in6_ifa_put(ifp);
258 }
259
260 enum addrconf_timer_t {
261 AC_NONE,
262 AC_DAD,
263 AC_RS,
264 };
265
266 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
267 enum addrconf_timer_t what,
268 unsigned long when)
269 {
270 if (!del_timer(&ifp->timer))
271 in6_ifa_hold(ifp);
272
273 switch (what) {
274 case AC_DAD:
275 ifp->timer.function = addrconf_dad_timer;
276 break;
277 case AC_RS:
278 ifp->timer.function = addrconf_rs_timer;
279 break;
280 default:
281 break;
282 }
283 ifp->timer.expires = jiffies + when;
284 add_timer(&ifp->timer);
285 }
286
287 static int snmp6_alloc_dev(struct inet6_dev *idev)
288 {
289 if (snmp_mib_init((void __percpu **)idev->stats.ipv6,
290 sizeof(struct ipstats_mib),
291 __alignof__(struct ipstats_mib)) < 0)
292 goto err_ip;
293 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
294 GFP_KERNEL);
295 if (!idev->stats.icmpv6dev)
296 goto err_icmp;
297 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
298 GFP_KERNEL);
299 if (!idev->stats.icmpv6msgdev)
300 goto err_icmpmsg;
301
302 return 0;
303
304 err_icmpmsg:
305 kfree(idev->stats.icmpv6dev);
306 err_icmp:
307 snmp_mib_free((void __percpu **)idev->stats.ipv6);
308 err_ip:
309 return -ENOMEM;
310 }
311
312 static void snmp6_free_dev(struct inet6_dev *idev)
313 {
314 kfree(idev->stats.icmpv6msgdev);
315 kfree(idev->stats.icmpv6dev);
316 snmp_mib_free((void __percpu **)idev->stats.ipv6);
317 }
318
319 /* Nobody refers to this device, we may destroy it. */
320
321 void in6_dev_finish_destroy(struct inet6_dev *idev)
322 {
323 struct net_device *dev = idev->dev;
324
325 WARN_ON(!list_empty(&idev->addr_list));
326 WARN_ON(idev->mc_list != NULL);
327
328 #ifdef NET_REFCNT_DEBUG
329 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
330 #endif
331 dev_put(dev);
332 if (!idev->dead) {
333 pr_warning("Freeing alive inet6 device %p\n", idev);
334 return;
335 }
336 snmp6_free_dev(idev);
337 kfree_rcu(idev, rcu);
338 }
339
340 EXPORT_SYMBOL(in6_dev_finish_destroy);
341
342 static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
343 {
344 struct inet6_dev *ndev;
345
346 ASSERT_RTNL();
347
348 if (dev->mtu < IPV6_MIN_MTU)
349 return NULL;
350
351 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
352
353 if (ndev == NULL)
354 return NULL;
355
356 rwlock_init(&ndev->lock);
357 ndev->dev = dev;
358 INIT_LIST_HEAD(&ndev->addr_list);
359
360 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
361 ndev->cnf.mtu6 = dev->mtu;
362 ndev->cnf.sysctl = NULL;
363 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
364 if (ndev->nd_parms == NULL) {
365 kfree(ndev);
366 return NULL;
367 }
368 if (ndev->cnf.forwarding)
369 dev_disable_lro(dev);
370 /* We refer to the device */
371 dev_hold(dev);
372
373 if (snmp6_alloc_dev(ndev) < 0) {
374 ADBG((KERN_WARNING
375 "%s(): cannot allocate memory for statistics; dev=%s.\n",
376 __func__, dev->name));
377 neigh_parms_release(&nd_tbl, ndev->nd_parms);
378 dev_put(dev);
379 kfree(ndev);
380 return NULL;
381 }
382
383 if (snmp6_register_dev(ndev) < 0) {
384 ADBG((KERN_WARNING
385 "%s(): cannot create /proc/net/dev_snmp6/%s\n",
386 __func__, dev->name));
387 neigh_parms_release(&nd_tbl, ndev->nd_parms);
388 ndev->dead = 1;
389 in6_dev_finish_destroy(ndev);
390 return NULL;
391 }
392
393 /* One reference from device. We must do this before
394 * we invoke __ipv6_regen_rndid().
395 */
396 in6_dev_hold(ndev);
397
398 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
399 ndev->cnf.accept_dad = -1;
400
401 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
402 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
403 printk(KERN_INFO
404 "%s: Disabled Multicast RS\n",
405 dev->name);
406 ndev->cnf.rtr_solicits = 0;
407 }
408 #endif
409
410 #ifdef CONFIG_IPV6_PRIVACY
411 INIT_LIST_HEAD(&ndev->tempaddr_list);
412 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
413 if ((dev->flags&IFF_LOOPBACK) ||
414 dev->type == ARPHRD_TUNNEL ||
415 dev->type == ARPHRD_TUNNEL6 ||
416 dev->type == ARPHRD_SIT ||
417 dev->type == ARPHRD_NONE) {
418 ndev->cnf.use_tempaddr = -1;
419 } else {
420 in6_dev_hold(ndev);
421 ipv6_regen_rndid((unsigned long) ndev);
422 }
423 #endif
424
425 if (netif_running(dev) && addrconf_qdisc_ok(dev))
426 ndev->if_flags |= IF_READY;
427
428 ipv6_mc_init_dev(ndev);
429 ndev->tstamp = jiffies;
430 addrconf_sysctl_register(ndev);
431 /* protected by rtnl_lock */
432 rcu_assign_pointer(dev->ip6_ptr, ndev);
433
434 /* Join all-node multicast group */
435 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
436
437 /* Join all-router multicast group if forwarding is set */
438 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
439 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
440
441 return ndev;
442 }
443
444 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
445 {
446 struct inet6_dev *idev;
447
448 ASSERT_RTNL();
449
450 idev = __in6_dev_get(dev);
451 if (!idev) {
452 idev = ipv6_add_dev(dev);
453 if (!idev)
454 return NULL;
455 }
456
457 if (dev->flags&IFF_UP)
458 ipv6_mc_up(idev);
459 return idev;
460 }
461
462 #ifdef CONFIG_SYSCTL
463 static void dev_forward_change(struct inet6_dev *idev)
464 {
465 struct net_device *dev;
466 struct inet6_ifaddr *ifa;
467
468 if (!idev)
469 return;
470 dev = idev->dev;
471 if (idev->cnf.forwarding)
472 dev_disable_lro(dev);
473 if (dev && (dev->flags & IFF_MULTICAST)) {
474 if (idev->cnf.forwarding)
475 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
476 else
477 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
478 }
479
480 list_for_each_entry(ifa, &idev->addr_list, if_list) {
481 if (ifa->flags&IFA_F_TENTATIVE)
482 continue;
483 if (idev->cnf.forwarding)
484 addrconf_join_anycast(ifa);
485 else
486 addrconf_leave_anycast(ifa);
487 }
488 }
489
490
491 static void addrconf_forward_change(struct net *net, __s32 newf)
492 {
493 struct net_device *dev;
494 struct inet6_dev *idev;
495
496 rcu_read_lock();
497 for_each_netdev_rcu(net, dev) {
498 idev = __in6_dev_get(dev);
499 if (idev) {
500 int changed = (!idev->cnf.forwarding) ^ (!newf);
501 idev->cnf.forwarding = newf;
502 if (changed)
503 dev_forward_change(idev);
504 }
505 }
506 rcu_read_unlock();
507 }
508
509 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
510 {
511 struct net *net;
512 int old;
513
514 if (!rtnl_trylock())
515 return restart_syscall();
516
517 net = (struct net *)table->extra2;
518 old = *p;
519 *p = newf;
520
521 if (p == &net->ipv6.devconf_dflt->forwarding) {
522 rtnl_unlock();
523 return 0;
524 }
525
526 if (p == &net->ipv6.devconf_all->forwarding) {
527 net->ipv6.devconf_dflt->forwarding = newf;
528 addrconf_forward_change(net, newf);
529 } else if ((!newf) ^ (!old))
530 dev_forward_change((struct inet6_dev *)table->extra1);
531 rtnl_unlock();
532
533 if (newf)
534 rt6_purge_dflt_routers(net);
535 return 1;
536 }
537 #endif
538
539 /* Nobody refers to this ifaddr, destroy it */
540 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
541 {
542 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
543
544 #ifdef NET_REFCNT_DEBUG
545 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
546 #endif
547
548 in6_dev_put(ifp->idev);
549
550 if (del_timer(&ifp->timer))
551 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp);
552
553 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
554 pr_warning("Freeing alive inet6 address %p\n", ifp);
555 return;
556 }
557 dst_release(&ifp->rt->dst);
558
559 kfree_rcu(ifp, rcu);
560 }
561
562 static void
563 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
564 {
565 struct list_head *p;
566 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
567
568 /*
569 * Each device address list is sorted in order of scope -
570 * global before linklocal.
571 */
572 list_for_each(p, &idev->addr_list) {
573 struct inet6_ifaddr *ifa
574 = list_entry(p, struct inet6_ifaddr, if_list);
575 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
576 break;
577 }
578
579 list_add_tail(&ifp->if_list, p);
580 }
581
582 static u32 ipv6_addr_hash(const struct in6_addr *addr)
583 {
584 /*
585 * We perform the hash function over the last 64 bits of the address
586 * This will include the IEEE address token on links that support it.
587 */
588 return jhash_2words((__force u32)addr->s6_addr32[2],
589 (__force u32)addr->s6_addr32[3], 0)
590 & (IN6_ADDR_HSIZE - 1);
591 }
592
593 /* On success it returns ifp with increased reference count */
594
595 static struct inet6_ifaddr *
596 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
597 int scope, u32 flags)
598 {
599 struct inet6_ifaddr *ifa = NULL;
600 struct rt6_info *rt;
601 unsigned int hash;
602 int err = 0;
603 int addr_type = ipv6_addr_type(addr);
604
605 if (addr_type == IPV6_ADDR_ANY ||
606 addr_type & IPV6_ADDR_MULTICAST ||
607 (!(idev->dev->flags & IFF_LOOPBACK) &&
608 addr_type & IPV6_ADDR_LOOPBACK))
609 return ERR_PTR(-EADDRNOTAVAIL);
610
611 rcu_read_lock_bh();
612 if (idev->dead) {
613 err = -ENODEV; /*XXX*/
614 goto out2;
615 }
616
617 if (idev->cnf.disable_ipv6) {
618 err = -EACCES;
619 goto out2;
620 }
621
622 spin_lock(&addrconf_hash_lock);
623
624 /* Ignore adding duplicate addresses on an interface */
625 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
626 ADBG(("ipv6_add_addr: already assigned\n"));
627 err = -EEXIST;
628 goto out;
629 }
630
631 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
632
633 if (ifa == NULL) {
634 ADBG(("ipv6_add_addr: malloc failed\n"));
635 err = -ENOBUFS;
636 goto out;
637 }
638
639 rt = addrconf_dst_alloc(idev, addr, false);
640 if (IS_ERR(rt)) {
641 err = PTR_ERR(rt);
642 goto out;
643 }
644
645 ifa->addr = *addr;
646
647 spin_lock_init(&ifa->lock);
648 spin_lock_init(&ifa->state_lock);
649 init_timer(&ifa->timer);
650 INIT_HLIST_NODE(&ifa->addr_lst);
651 ifa->timer.data = (unsigned long) ifa;
652 ifa->scope = scope;
653 ifa->prefix_len = pfxlen;
654 ifa->flags = flags | IFA_F_TENTATIVE;
655 ifa->cstamp = ifa->tstamp = jiffies;
656
657 ifa->rt = rt;
658
659 ifa->idev = idev;
660 in6_dev_hold(idev);
661 /* For caller */
662 in6_ifa_hold(ifa);
663
664 /* Add to big hash table */
665 hash = ipv6_addr_hash(addr);
666
667 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
668 spin_unlock(&addrconf_hash_lock);
669
670 write_lock(&idev->lock);
671 /* Add to inet6_dev unicast addr list. */
672 ipv6_link_dev_addr(idev, ifa);
673
674 #ifdef CONFIG_IPV6_PRIVACY
675 if (ifa->flags&IFA_F_TEMPORARY) {
676 list_add(&ifa->tmp_list, &idev->tempaddr_list);
677 in6_ifa_hold(ifa);
678 }
679 #endif
680
681 in6_ifa_hold(ifa);
682 write_unlock(&idev->lock);
683 out2:
684 rcu_read_unlock_bh();
685
686 if (likely(err == 0))
687 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
688 else {
689 kfree(ifa);
690 ifa = ERR_PTR(err);
691 }
692
693 return ifa;
694 out:
695 spin_unlock(&addrconf_hash_lock);
696 goto out2;
697 }
698
699 /* This function wants to get referenced ifp and releases it before return */
700
701 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
702 {
703 struct inet6_ifaddr *ifa, *ifn;
704 struct inet6_dev *idev = ifp->idev;
705 int state;
706 int deleted = 0, onlink = 0;
707 unsigned long expires = jiffies;
708
709 spin_lock_bh(&ifp->state_lock);
710 state = ifp->state;
711 ifp->state = INET6_IFADDR_STATE_DEAD;
712 spin_unlock_bh(&ifp->state_lock);
713
714 if (state == INET6_IFADDR_STATE_DEAD)
715 goto out;
716
717 spin_lock_bh(&addrconf_hash_lock);
718 hlist_del_init_rcu(&ifp->addr_lst);
719 spin_unlock_bh(&addrconf_hash_lock);
720
721 write_lock_bh(&idev->lock);
722 #ifdef CONFIG_IPV6_PRIVACY
723 if (ifp->flags&IFA_F_TEMPORARY) {
724 list_del(&ifp->tmp_list);
725 if (ifp->ifpub) {
726 in6_ifa_put(ifp->ifpub);
727 ifp->ifpub = NULL;
728 }
729 __in6_ifa_put(ifp);
730 }
731 #endif
732
733 list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) {
734 if (ifa == ifp) {
735 list_del_init(&ifp->if_list);
736 __in6_ifa_put(ifp);
737
738 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
739 break;
740 deleted = 1;
741 continue;
742 } else if (ifp->flags & IFA_F_PERMANENT) {
743 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
744 ifp->prefix_len)) {
745 if (ifa->flags & IFA_F_PERMANENT) {
746 onlink = 1;
747 if (deleted)
748 break;
749 } else {
750 unsigned long lifetime;
751
752 if (!onlink)
753 onlink = -1;
754
755 spin_lock(&ifa->lock);
756
757 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
758 /*
759 * Note: Because this address is
760 * not permanent, lifetime <
761 * LONG_MAX / HZ here.
762 */
763 if (time_before(expires,
764 ifa->tstamp + lifetime * HZ))
765 expires = ifa->tstamp + lifetime * HZ;
766 spin_unlock(&ifa->lock);
767 }
768 }
769 }
770 }
771 write_unlock_bh(&idev->lock);
772
773 addrconf_del_timer(ifp);
774
775 ipv6_ifa_notify(RTM_DELADDR, ifp);
776
777 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
778
779 /*
780 * Purge or update corresponding prefix
781 *
782 * 1) we don't purge prefix here if address was not permanent.
783 * prefix is managed by its own lifetime.
784 * 2) if there're no addresses, delete prefix.
785 * 3) if there're still other permanent address(es),
786 * corresponding prefix is still permanent.
787 * 4) otherwise, update prefix lifetime to the
788 * longest valid lifetime among the corresponding
789 * addresses on the device.
790 * Note: subsequent RA will update lifetime.
791 *
792 * --yoshfuji
793 */
794 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
795 struct in6_addr prefix;
796 struct rt6_info *rt;
797 struct net *net = dev_net(ifp->idev->dev);
798 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
799 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1);
800
801 if (rt && addrconf_is_prefix_route(rt)) {
802 if (onlink == 0) {
803 ip6_del_rt(rt);
804 rt = NULL;
805 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
806 rt6_set_expires(rt, expires);
807 }
808 }
809 dst_release(&rt->dst);
810 }
811
812 /* clean up prefsrc entries */
813 rt6_remove_prefsrc(ifp);
814 out:
815 in6_ifa_put(ifp);
816 }
817
818 #ifdef CONFIG_IPV6_PRIVACY
819 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
820 {
821 struct inet6_dev *idev = ifp->idev;
822 struct in6_addr addr, *tmpaddr;
823 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
824 unsigned long regen_advance;
825 int tmp_plen;
826 int ret = 0;
827 int max_addresses;
828 u32 addr_flags;
829 unsigned long now = jiffies;
830
831 write_lock(&idev->lock);
832 if (ift) {
833 spin_lock_bh(&ift->lock);
834 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
835 spin_unlock_bh(&ift->lock);
836 tmpaddr = &addr;
837 } else {
838 tmpaddr = NULL;
839 }
840 retry:
841 in6_dev_hold(idev);
842 if (idev->cnf.use_tempaddr <= 0) {
843 write_unlock(&idev->lock);
844 printk(KERN_INFO
845 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
846 in6_dev_put(idev);
847 ret = -1;
848 goto out;
849 }
850 spin_lock_bh(&ifp->lock);
851 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
852 idev->cnf.use_tempaddr = -1; /*XXX*/
853 spin_unlock_bh(&ifp->lock);
854 write_unlock(&idev->lock);
855 printk(KERN_WARNING
856 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
857 in6_dev_put(idev);
858 ret = -1;
859 goto out;
860 }
861 in6_ifa_hold(ifp);
862 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
863 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
864 spin_unlock_bh(&ifp->lock);
865 write_unlock(&idev->lock);
866 printk(KERN_WARNING
867 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
868 in6_ifa_put(ifp);
869 in6_dev_put(idev);
870 ret = -1;
871 goto out;
872 }
873 memcpy(&addr.s6_addr[8], idev->rndid, 8);
874 age = (now - ifp->tstamp) / HZ;
875 tmp_valid_lft = min_t(__u32,
876 ifp->valid_lft,
877 idev->cnf.temp_valid_lft + age);
878 tmp_prefered_lft = min_t(__u32,
879 ifp->prefered_lft,
880 idev->cnf.temp_prefered_lft + age -
881 idev->cnf.max_desync_factor);
882 tmp_plen = ifp->prefix_len;
883 max_addresses = idev->cnf.max_addresses;
884 tmp_tstamp = ifp->tstamp;
885 spin_unlock_bh(&ifp->lock);
886
887 regen_advance = idev->cnf.regen_max_retry *
888 idev->cnf.dad_transmits *
889 idev->nd_parms->retrans_time / HZ;
890 write_unlock(&idev->lock);
891
892 /* A temporary address is created only if this calculated Preferred
893 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
894 * an implementation must not create a temporary address with a zero
895 * Preferred Lifetime.
896 */
897 if (tmp_prefered_lft <= regen_advance) {
898 in6_ifa_put(ifp);
899 in6_dev_put(idev);
900 ret = -1;
901 goto out;
902 }
903
904 addr_flags = IFA_F_TEMPORARY;
905 /* set in addrconf_prefix_rcv() */
906 if (ifp->flags & IFA_F_OPTIMISTIC)
907 addr_flags |= IFA_F_OPTIMISTIC;
908
909 ift = !max_addresses ||
910 ipv6_count_addresses(idev) < max_addresses ?
911 ipv6_add_addr(idev, &addr, tmp_plen,
912 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
913 addr_flags) : NULL;
914 if (!ift || IS_ERR(ift)) {
915 in6_ifa_put(ifp);
916 in6_dev_put(idev);
917 printk(KERN_INFO
918 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
919 tmpaddr = &addr;
920 write_lock(&idev->lock);
921 goto retry;
922 }
923
924 spin_lock_bh(&ift->lock);
925 ift->ifpub = ifp;
926 ift->valid_lft = tmp_valid_lft;
927 ift->prefered_lft = tmp_prefered_lft;
928 ift->cstamp = now;
929 ift->tstamp = tmp_tstamp;
930 spin_unlock_bh(&ift->lock);
931
932 addrconf_dad_start(ift, 0);
933 in6_ifa_put(ift);
934 in6_dev_put(idev);
935 out:
936 return ret;
937 }
938 #endif
939
940 /*
941 * Choose an appropriate source address (RFC3484)
942 */
943 enum {
944 IPV6_SADDR_RULE_INIT = 0,
945 IPV6_SADDR_RULE_LOCAL,
946 IPV6_SADDR_RULE_SCOPE,
947 IPV6_SADDR_RULE_PREFERRED,
948 #ifdef CONFIG_IPV6_MIP6
949 IPV6_SADDR_RULE_HOA,
950 #endif
951 IPV6_SADDR_RULE_OIF,
952 IPV6_SADDR_RULE_LABEL,
953 #ifdef CONFIG_IPV6_PRIVACY
954 IPV6_SADDR_RULE_PRIVACY,
955 #endif
956 IPV6_SADDR_RULE_ORCHID,
957 IPV6_SADDR_RULE_PREFIX,
958 IPV6_SADDR_RULE_MAX
959 };
960
961 struct ipv6_saddr_score {
962 int rule;
963 int addr_type;
964 struct inet6_ifaddr *ifa;
965 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
966 int scopedist;
967 int matchlen;
968 };
969
970 struct ipv6_saddr_dst {
971 const struct in6_addr *addr;
972 int ifindex;
973 int scope;
974 int label;
975 unsigned int prefs;
976 };
977
978 static inline int ipv6_saddr_preferred(int type)
979 {
980 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
981 return 1;
982 return 0;
983 }
984
985 static int ipv6_get_saddr_eval(struct net *net,
986 struct ipv6_saddr_score *score,
987 struct ipv6_saddr_dst *dst,
988 int i)
989 {
990 int ret;
991
992 if (i <= score->rule) {
993 switch (i) {
994 case IPV6_SADDR_RULE_SCOPE:
995 ret = score->scopedist;
996 break;
997 case IPV6_SADDR_RULE_PREFIX:
998 ret = score->matchlen;
999 break;
1000 default:
1001 ret = !!test_bit(i, score->scorebits);
1002 }
1003 goto out;
1004 }
1005
1006 switch (i) {
1007 case IPV6_SADDR_RULE_INIT:
1008 /* Rule 0: remember if hiscore is not ready yet */
1009 ret = !!score->ifa;
1010 break;
1011 case IPV6_SADDR_RULE_LOCAL:
1012 /* Rule 1: Prefer same address */
1013 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1014 break;
1015 case IPV6_SADDR_RULE_SCOPE:
1016 /* Rule 2: Prefer appropriate scope
1017 *
1018 * ret
1019 * ^
1020 * -1 | d 15
1021 * ---+--+-+---> scope
1022 * |
1023 * | d is scope of the destination.
1024 * B-d | \
1025 * | \ <- smaller scope is better if
1026 * B-15 | \ if scope is enough for destinaion.
1027 * | ret = B - scope (-1 <= scope >= d <= 15).
1028 * d-C-1 | /
1029 * |/ <- greater is better
1030 * -C / if scope is not enough for destination.
1031 * /| ret = scope - C (-1 <= d < scope <= 15).
1032 *
1033 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1034 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1035 * Assume B = 0 and we get C > 29.
1036 */
1037 ret = __ipv6_addr_src_scope(score->addr_type);
1038 if (ret >= dst->scope)
1039 ret = -ret;
1040 else
1041 ret -= 128; /* 30 is enough */
1042 score->scopedist = ret;
1043 break;
1044 case IPV6_SADDR_RULE_PREFERRED:
1045 /* Rule 3: Avoid deprecated and optimistic addresses */
1046 ret = ipv6_saddr_preferred(score->addr_type) ||
1047 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1048 break;
1049 #ifdef CONFIG_IPV6_MIP6
1050 case IPV6_SADDR_RULE_HOA:
1051 {
1052 /* Rule 4: Prefer home address */
1053 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1054 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1055 break;
1056 }
1057 #endif
1058 case IPV6_SADDR_RULE_OIF:
1059 /* Rule 5: Prefer outgoing interface */
1060 ret = (!dst->ifindex ||
1061 dst->ifindex == score->ifa->idev->dev->ifindex);
1062 break;
1063 case IPV6_SADDR_RULE_LABEL:
1064 /* Rule 6: Prefer matching label */
1065 ret = ipv6_addr_label(net,
1066 &score->ifa->addr, score->addr_type,
1067 score->ifa->idev->dev->ifindex) == dst->label;
1068 break;
1069 #ifdef CONFIG_IPV6_PRIVACY
1070 case IPV6_SADDR_RULE_PRIVACY:
1071 {
1072 /* Rule 7: Prefer public address
1073 * Note: prefer temporary address if use_tempaddr >= 2
1074 */
1075 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1076 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1077 score->ifa->idev->cnf.use_tempaddr >= 2;
1078 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1079 break;
1080 }
1081 #endif
1082 case IPV6_SADDR_RULE_ORCHID:
1083 /* Rule 8-: Prefer ORCHID vs ORCHID or
1084 * non-ORCHID vs non-ORCHID
1085 */
1086 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1087 ipv6_addr_orchid(dst->addr));
1088 break;
1089 case IPV6_SADDR_RULE_PREFIX:
1090 /* Rule 8: Use longest matching prefix */
1091 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr,
1092 dst->addr);
1093 break;
1094 default:
1095 ret = 0;
1096 }
1097
1098 if (ret)
1099 __set_bit(i, score->scorebits);
1100 score->rule = i;
1101 out:
1102 return ret;
1103 }
1104
1105 int ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev,
1106 const struct in6_addr *daddr, unsigned int prefs,
1107 struct in6_addr *saddr)
1108 {
1109 struct ipv6_saddr_score scores[2],
1110 *score = &scores[0], *hiscore = &scores[1];
1111 struct ipv6_saddr_dst dst;
1112 struct net_device *dev;
1113 int dst_type;
1114
1115 dst_type = __ipv6_addr_type(daddr);
1116 dst.addr = daddr;
1117 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1118 dst.scope = __ipv6_addr_src_scope(dst_type);
1119 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1120 dst.prefs = prefs;
1121
1122 hiscore->rule = -1;
1123 hiscore->ifa = NULL;
1124
1125 rcu_read_lock();
1126
1127 for_each_netdev_rcu(net, dev) {
1128 struct inet6_dev *idev;
1129
1130 /* Candidate Source Address (section 4)
1131 * - multicast and link-local destination address,
1132 * the set of candidate source address MUST only
1133 * include addresses assigned to interfaces
1134 * belonging to the same link as the outgoing
1135 * interface.
1136 * (- For site-local destination addresses, the
1137 * set of candidate source addresses MUST only
1138 * include addresses assigned to interfaces
1139 * belonging to the same site as the outgoing
1140 * interface.)
1141 */
1142 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1143 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1144 dst.ifindex && dev->ifindex != dst.ifindex)
1145 continue;
1146
1147 idev = __in6_dev_get(dev);
1148 if (!idev)
1149 continue;
1150
1151 read_lock_bh(&idev->lock);
1152 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1153 int i;
1154
1155 /*
1156 * - Tentative Address (RFC2462 section 5.4)
1157 * - A tentative address is not considered
1158 * "assigned to an interface" in the traditional
1159 * sense, unless it is also flagged as optimistic.
1160 * - Candidate Source Address (section 4)
1161 * - In any case, anycast addresses, multicast
1162 * addresses, and the unspecified address MUST
1163 * NOT be included in a candidate set.
1164 */
1165 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1166 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1167 continue;
1168
1169 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1170
1171 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1172 score->addr_type & IPV6_ADDR_MULTICAST)) {
1173 LIMIT_NETDEBUG(KERN_DEBUG
1174 "ADDRCONF: unspecified / multicast address "
1175 "assigned as unicast address on %s",
1176 dev->name);
1177 continue;
1178 }
1179
1180 score->rule = -1;
1181 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1182
1183 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1184 int minihiscore, miniscore;
1185
1186 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1187 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1188
1189 if (minihiscore > miniscore) {
1190 if (i == IPV6_SADDR_RULE_SCOPE &&
1191 score->scopedist > 0) {
1192 /*
1193 * special case:
1194 * each remaining entry
1195 * has too small (not enough)
1196 * scope, because ifa entries
1197 * are sorted by their scope
1198 * values.
1199 */
1200 goto try_nextdev;
1201 }
1202 break;
1203 } else if (minihiscore < miniscore) {
1204 if (hiscore->ifa)
1205 in6_ifa_put(hiscore->ifa);
1206
1207 in6_ifa_hold(score->ifa);
1208
1209 swap(hiscore, score);
1210
1211 /* restore our iterator */
1212 score->ifa = hiscore->ifa;
1213
1214 break;
1215 }
1216 }
1217 }
1218 try_nextdev:
1219 read_unlock_bh(&idev->lock);
1220 }
1221 rcu_read_unlock();
1222
1223 if (!hiscore->ifa)
1224 return -EADDRNOTAVAIL;
1225
1226 *saddr = hiscore->ifa->addr;
1227 in6_ifa_put(hiscore->ifa);
1228 return 0;
1229 }
1230 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1231
1232 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1233 unsigned char banned_flags)
1234 {
1235 struct inet6_dev *idev;
1236 int err = -EADDRNOTAVAIL;
1237
1238 rcu_read_lock();
1239 idev = __in6_dev_get(dev);
1240 if (idev) {
1241 struct inet6_ifaddr *ifp;
1242
1243 read_lock_bh(&idev->lock);
1244 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1245 if (ifp->scope == IFA_LINK &&
1246 !(ifp->flags & banned_flags)) {
1247 *addr = ifp->addr;
1248 err = 0;
1249 break;
1250 }
1251 }
1252 read_unlock_bh(&idev->lock);
1253 }
1254 rcu_read_unlock();
1255 return err;
1256 }
1257
1258 static int ipv6_count_addresses(struct inet6_dev *idev)
1259 {
1260 int cnt = 0;
1261 struct inet6_ifaddr *ifp;
1262
1263 read_lock_bh(&idev->lock);
1264 list_for_each_entry(ifp, &idev->addr_list, if_list)
1265 cnt++;
1266 read_unlock_bh(&idev->lock);
1267 return cnt;
1268 }
1269
1270 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1271 struct net_device *dev, int strict)
1272 {
1273 struct inet6_ifaddr *ifp;
1274 struct hlist_node *node;
1275 unsigned int hash = ipv6_addr_hash(addr);
1276
1277 rcu_read_lock_bh();
1278 hlist_for_each_entry_rcu(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1279 if (!net_eq(dev_net(ifp->idev->dev), net))
1280 continue;
1281 if (ipv6_addr_equal(&ifp->addr, addr) &&
1282 !(ifp->flags&IFA_F_TENTATIVE) &&
1283 (dev == NULL || ifp->idev->dev == dev ||
1284 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1285 rcu_read_unlock_bh();
1286 return 1;
1287 }
1288 }
1289
1290 rcu_read_unlock_bh();
1291 return 0;
1292 }
1293 EXPORT_SYMBOL(ipv6_chk_addr);
1294
1295 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1296 struct net_device *dev)
1297 {
1298 unsigned int hash = ipv6_addr_hash(addr);
1299 struct inet6_ifaddr *ifp;
1300 struct hlist_node *node;
1301
1302 hlist_for_each_entry(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1303 if (!net_eq(dev_net(ifp->idev->dev), net))
1304 continue;
1305 if (ipv6_addr_equal(&ifp->addr, addr)) {
1306 if (dev == NULL || ifp->idev->dev == dev)
1307 return true;
1308 }
1309 }
1310 return false;
1311 }
1312
1313 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1314 {
1315 struct inet6_dev *idev;
1316 struct inet6_ifaddr *ifa;
1317 int onlink;
1318
1319 onlink = 0;
1320 rcu_read_lock();
1321 idev = __in6_dev_get(dev);
1322 if (idev) {
1323 read_lock_bh(&idev->lock);
1324 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1325 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1326 ifa->prefix_len);
1327 if (onlink)
1328 break;
1329 }
1330 read_unlock_bh(&idev->lock);
1331 }
1332 rcu_read_unlock();
1333 return onlink;
1334 }
1335
1336 EXPORT_SYMBOL(ipv6_chk_prefix);
1337
1338 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1339 struct net_device *dev, int strict)
1340 {
1341 struct inet6_ifaddr *ifp, *result = NULL;
1342 unsigned int hash = ipv6_addr_hash(addr);
1343 struct hlist_node *node;
1344
1345 rcu_read_lock_bh();
1346 hlist_for_each_entry_rcu_bh(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1347 if (!net_eq(dev_net(ifp->idev->dev), net))
1348 continue;
1349 if (ipv6_addr_equal(&ifp->addr, addr)) {
1350 if (dev == NULL || ifp->idev->dev == dev ||
1351 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1352 result = ifp;
1353 in6_ifa_hold(ifp);
1354 break;
1355 }
1356 }
1357 }
1358 rcu_read_unlock_bh();
1359
1360 return result;
1361 }
1362
1363 /* Gets referenced address, destroys ifaddr */
1364
1365 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1366 {
1367 if (ifp->flags&IFA_F_PERMANENT) {
1368 spin_lock_bh(&ifp->lock);
1369 addrconf_del_timer(ifp);
1370 ifp->flags |= IFA_F_TENTATIVE;
1371 if (dad_failed)
1372 ifp->flags |= IFA_F_DADFAILED;
1373 spin_unlock_bh(&ifp->lock);
1374 if (dad_failed)
1375 ipv6_ifa_notify(0, ifp);
1376 in6_ifa_put(ifp);
1377 #ifdef CONFIG_IPV6_PRIVACY
1378 } else if (ifp->flags&IFA_F_TEMPORARY) {
1379 struct inet6_ifaddr *ifpub;
1380 spin_lock_bh(&ifp->lock);
1381 ifpub = ifp->ifpub;
1382 if (ifpub) {
1383 in6_ifa_hold(ifpub);
1384 spin_unlock_bh(&ifp->lock);
1385 ipv6_create_tempaddr(ifpub, ifp);
1386 in6_ifa_put(ifpub);
1387 } else {
1388 spin_unlock_bh(&ifp->lock);
1389 }
1390 ipv6_del_addr(ifp);
1391 #endif
1392 } else
1393 ipv6_del_addr(ifp);
1394 }
1395
1396 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1397 {
1398 int err = -ENOENT;
1399
1400 spin_lock(&ifp->state_lock);
1401 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1402 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1403 err = 0;
1404 }
1405 spin_unlock(&ifp->state_lock);
1406
1407 return err;
1408 }
1409
1410 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1411 {
1412 struct inet6_dev *idev = ifp->idev;
1413
1414 if (addrconf_dad_end(ifp)) {
1415 in6_ifa_put(ifp);
1416 return;
1417 }
1418
1419 if (net_ratelimit())
1420 printk(KERN_INFO "%s: IPv6 duplicate address %pI6c detected!\n",
1421 ifp->idev->dev->name, &ifp->addr);
1422
1423 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1424 struct in6_addr addr;
1425
1426 addr.s6_addr32[0] = htonl(0xfe800000);
1427 addr.s6_addr32[1] = 0;
1428
1429 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1430 ipv6_addr_equal(&ifp->addr, &addr)) {
1431 /* DAD failed for link-local based on MAC address */
1432 idev->cnf.disable_ipv6 = 1;
1433
1434 printk(KERN_INFO "%s: IPv6 being disabled!\n",
1435 ifp->idev->dev->name);
1436 }
1437 }
1438
1439 addrconf_dad_stop(ifp, 1);
1440 }
1441
1442 /* Join to solicited addr multicast group. */
1443
1444 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1445 {
1446 struct in6_addr maddr;
1447
1448 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1449 return;
1450
1451 addrconf_addr_solict_mult(addr, &maddr);
1452 ipv6_dev_mc_inc(dev, &maddr);
1453 }
1454
1455 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1456 {
1457 struct in6_addr maddr;
1458
1459 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1460 return;
1461
1462 addrconf_addr_solict_mult(addr, &maddr);
1463 __ipv6_dev_mc_dec(idev, &maddr);
1464 }
1465
1466 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1467 {
1468 struct in6_addr addr;
1469 if (ifp->prefix_len == 127) /* RFC 6164 */
1470 return;
1471 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1472 if (ipv6_addr_any(&addr))
1473 return;
1474 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1475 }
1476
1477 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1478 {
1479 struct in6_addr addr;
1480 if (ifp->prefix_len == 127) /* RFC 6164 */
1481 return;
1482 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1483 if (ipv6_addr_any(&addr))
1484 return;
1485 __ipv6_dev_ac_dec(ifp->idev, &addr);
1486 }
1487
1488 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1489 {
1490 if (dev->addr_len != ETH_ALEN)
1491 return -1;
1492 memcpy(eui, dev->dev_addr, 3);
1493 memcpy(eui + 5, dev->dev_addr + 3, 3);
1494
1495 /*
1496 * The zSeries OSA network cards can be shared among various
1497 * OS instances, but the OSA cards have only one MAC address.
1498 * This leads to duplicate address conflicts in conjunction
1499 * with IPv6 if more than one instance uses the same card.
1500 *
1501 * The driver for these cards can deliver a unique 16-bit
1502 * identifier for each instance sharing the same card. It is
1503 * placed instead of 0xFFFE in the interface identifier. The
1504 * "u" bit of the interface identifier is not inverted in this
1505 * case. Hence the resulting interface identifier has local
1506 * scope according to RFC2373.
1507 */
1508 if (dev->dev_id) {
1509 eui[3] = (dev->dev_id >> 8) & 0xFF;
1510 eui[4] = dev->dev_id & 0xFF;
1511 } else {
1512 eui[3] = 0xFF;
1513 eui[4] = 0xFE;
1514 eui[0] ^= 2;
1515 }
1516 return 0;
1517 }
1518
1519 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1520 {
1521 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1522 if (dev->addr_len != ARCNET_ALEN)
1523 return -1;
1524 memset(eui, 0, 7);
1525 eui[7] = *(u8*)dev->dev_addr;
1526 return 0;
1527 }
1528
1529 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1530 {
1531 if (dev->addr_len != INFINIBAND_ALEN)
1532 return -1;
1533 memcpy(eui, dev->dev_addr + 12, 8);
1534 eui[0] |= 2;
1535 return 0;
1536 }
1537
1538 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1539 {
1540 if (addr == 0)
1541 return -1;
1542 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1543 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1544 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1545 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1546 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1547 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1548 eui[1] = 0;
1549 eui[2] = 0x5E;
1550 eui[3] = 0xFE;
1551 memcpy(eui + 4, &addr, 4);
1552 return 0;
1553 }
1554
1555 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1556 {
1557 if (dev->priv_flags & IFF_ISATAP)
1558 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1559 return -1;
1560 }
1561
1562 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
1563 {
1564 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1565 }
1566
1567 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1568 {
1569 switch (dev->type) {
1570 case ARPHRD_ETHER:
1571 case ARPHRD_FDDI:
1572 case ARPHRD_IEEE802_TR:
1573 return addrconf_ifid_eui48(eui, dev);
1574 case ARPHRD_ARCNET:
1575 return addrconf_ifid_arcnet(eui, dev);
1576 case ARPHRD_INFINIBAND:
1577 return addrconf_ifid_infiniband(eui, dev);
1578 case ARPHRD_SIT:
1579 return addrconf_ifid_sit(eui, dev);
1580 case ARPHRD_IPGRE:
1581 return addrconf_ifid_gre(eui, dev);
1582 }
1583 return -1;
1584 }
1585
1586 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1587 {
1588 int err = -1;
1589 struct inet6_ifaddr *ifp;
1590
1591 read_lock_bh(&idev->lock);
1592 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1593 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1594 memcpy(eui, ifp->addr.s6_addr+8, 8);
1595 err = 0;
1596 break;
1597 }
1598 }
1599 read_unlock_bh(&idev->lock);
1600 return err;
1601 }
1602
1603 #ifdef CONFIG_IPV6_PRIVACY
1604 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1605 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1606 {
1607 regen:
1608 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1609 idev->rndid[0] &= ~0x02;
1610
1611 /*
1612 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1613 * check if generated address is not inappropriate
1614 *
1615 * - Reserved subnet anycast (RFC 2526)
1616 * 11111101 11....11 1xxxxxxx
1617 * - ISATAP (RFC4214) 6.1
1618 * 00-00-5E-FE-xx-xx-xx-xx
1619 * - value 0
1620 * - XXX: already assigned to an address on the device
1621 */
1622 if (idev->rndid[0] == 0xfd &&
1623 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1624 (idev->rndid[7]&0x80))
1625 goto regen;
1626 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1627 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1628 goto regen;
1629 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1630 goto regen;
1631 }
1632
1633 return 0;
1634 }
1635
1636 static void ipv6_regen_rndid(unsigned long data)
1637 {
1638 struct inet6_dev *idev = (struct inet6_dev *) data;
1639 unsigned long expires;
1640
1641 rcu_read_lock_bh();
1642 write_lock_bh(&idev->lock);
1643
1644 if (idev->dead)
1645 goto out;
1646
1647 if (__ipv6_regen_rndid(idev) < 0)
1648 goto out;
1649
1650 expires = jiffies +
1651 idev->cnf.temp_prefered_lft * HZ -
1652 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time -
1653 idev->cnf.max_desync_factor * HZ;
1654 if (time_before(expires, jiffies)) {
1655 printk(KERN_WARNING
1656 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1657 idev->dev->name);
1658 goto out;
1659 }
1660
1661 if (!mod_timer(&idev->regen_timer, expires))
1662 in6_dev_hold(idev);
1663
1664 out:
1665 write_unlock_bh(&idev->lock);
1666 rcu_read_unlock_bh();
1667 in6_dev_put(idev);
1668 }
1669
1670 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1671 int ret = 0;
1672
1673 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1674 ret = __ipv6_regen_rndid(idev);
1675 return ret;
1676 }
1677 #endif
1678
1679 /*
1680 * Add prefix route.
1681 */
1682
1683 static void
1684 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1685 unsigned long expires, u32 flags)
1686 {
1687 struct fib6_config cfg = {
1688 .fc_table = RT6_TABLE_PREFIX,
1689 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1690 .fc_ifindex = dev->ifindex,
1691 .fc_expires = expires,
1692 .fc_dst_len = plen,
1693 .fc_flags = RTF_UP | flags,
1694 .fc_nlinfo.nl_net = dev_net(dev),
1695 .fc_protocol = RTPROT_KERNEL,
1696 };
1697
1698 cfg.fc_dst = *pfx;
1699
1700 /* Prevent useless cloning on PtP SIT.
1701 This thing is done here expecting that the whole
1702 class of non-broadcast devices need not cloning.
1703 */
1704 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1705 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1706 cfg.fc_flags |= RTF_NONEXTHOP;
1707 #endif
1708
1709 ip6_route_add(&cfg);
1710 }
1711
1712
1713 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
1714 int plen,
1715 const struct net_device *dev,
1716 u32 flags, u32 noflags)
1717 {
1718 struct fib6_node *fn;
1719 struct rt6_info *rt = NULL;
1720 struct fib6_table *table;
1721
1722 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX);
1723 if (table == NULL)
1724 return NULL;
1725
1726 write_lock_bh(&table->tb6_lock);
1727 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
1728 if (!fn)
1729 goto out;
1730 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1731 if (rt->dst.dev->ifindex != dev->ifindex)
1732 continue;
1733 if ((rt->rt6i_flags & flags) != flags)
1734 continue;
1735 if ((noflags != 0) && ((rt->rt6i_flags & flags) != 0))
1736 continue;
1737 dst_hold(&rt->dst);
1738 break;
1739 }
1740 out:
1741 write_unlock_bh(&table->tb6_lock);
1742 return rt;
1743 }
1744
1745
1746 /* Create "default" multicast route to the interface */
1747
1748 static void addrconf_add_mroute(struct net_device *dev)
1749 {
1750 struct fib6_config cfg = {
1751 .fc_table = RT6_TABLE_LOCAL,
1752 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1753 .fc_ifindex = dev->ifindex,
1754 .fc_dst_len = 8,
1755 .fc_flags = RTF_UP,
1756 .fc_nlinfo.nl_net = dev_net(dev),
1757 };
1758
1759 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1760
1761 ip6_route_add(&cfg);
1762 }
1763
1764 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1765 static void sit_route_add(struct net_device *dev)
1766 {
1767 struct fib6_config cfg = {
1768 .fc_table = RT6_TABLE_MAIN,
1769 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1770 .fc_ifindex = dev->ifindex,
1771 .fc_dst_len = 96,
1772 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1773 .fc_nlinfo.nl_net = dev_net(dev),
1774 };
1775
1776 /* prefix length - 96 bits "::d.d.d.d" */
1777 ip6_route_add(&cfg);
1778 }
1779 #endif
1780
1781 static void addrconf_add_lroute(struct net_device *dev)
1782 {
1783 struct in6_addr addr;
1784
1785 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1786 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1787 }
1788
1789 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1790 {
1791 struct inet6_dev *idev;
1792
1793 ASSERT_RTNL();
1794
1795 idev = ipv6_find_idev(dev);
1796 if (!idev)
1797 return ERR_PTR(-ENOBUFS);
1798
1799 if (idev->cnf.disable_ipv6)
1800 return ERR_PTR(-EACCES);
1801
1802 /* Add default multicast route */
1803 if (!(dev->flags & IFF_LOOPBACK))
1804 addrconf_add_mroute(dev);
1805
1806 /* Add link local route */
1807 addrconf_add_lroute(dev);
1808 return idev;
1809 }
1810
1811 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
1812 {
1813 struct prefix_info *pinfo;
1814 __u32 valid_lft;
1815 __u32 prefered_lft;
1816 int addr_type;
1817 struct inet6_dev *in6_dev;
1818 struct net *net = dev_net(dev);
1819
1820 pinfo = (struct prefix_info *) opt;
1821
1822 if (len < sizeof(struct prefix_info)) {
1823 ADBG(("addrconf: prefix option too short\n"));
1824 return;
1825 }
1826
1827 /*
1828 * Validation checks ([ADDRCONF], page 19)
1829 */
1830
1831 addr_type = ipv6_addr_type(&pinfo->prefix);
1832
1833 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1834 return;
1835
1836 valid_lft = ntohl(pinfo->valid);
1837 prefered_lft = ntohl(pinfo->prefered);
1838
1839 if (prefered_lft > valid_lft) {
1840 if (net_ratelimit())
1841 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1842 return;
1843 }
1844
1845 in6_dev = in6_dev_get(dev);
1846
1847 if (in6_dev == NULL) {
1848 if (net_ratelimit())
1849 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1850 return;
1851 }
1852
1853 /*
1854 * Two things going on here:
1855 * 1) Add routes for on-link prefixes
1856 * 2) Configure prefixes with the auto flag set
1857 */
1858
1859 if (pinfo->onlink) {
1860 struct rt6_info *rt;
1861 unsigned long rt_expires;
1862
1863 /* Avoid arithmetic overflow. Really, we could
1864 * save rt_expires in seconds, likely valid_lft,
1865 * but it would require division in fib gc, that it
1866 * not good.
1867 */
1868 if (HZ > USER_HZ)
1869 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
1870 else
1871 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
1872
1873 if (addrconf_finite_timeout(rt_expires))
1874 rt_expires *= HZ;
1875
1876 rt = addrconf_get_prefix_route(&pinfo->prefix,
1877 pinfo->prefix_len,
1878 dev,
1879 RTF_ADDRCONF | RTF_PREFIX_RT,
1880 RTF_GATEWAY | RTF_DEFAULT);
1881
1882 if (rt) {
1883 /* Autoconf prefix route */
1884 if (valid_lft == 0) {
1885 ip6_del_rt(rt);
1886 rt = NULL;
1887 } else if (addrconf_finite_timeout(rt_expires)) {
1888 /* not infinity */
1889 rt6_set_expires(rt, jiffies + rt_expires);
1890 } else {
1891 rt6_clean_expires(rt);
1892 }
1893 } else if (valid_lft) {
1894 clock_t expires = 0;
1895 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
1896 if (addrconf_finite_timeout(rt_expires)) {
1897 /* not infinity */
1898 flags |= RTF_EXPIRES;
1899 expires = jiffies_to_clock_t(rt_expires);
1900 }
1901 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1902 dev, expires, flags);
1903 }
1904 if (rt)
1905 dst_release(&rt->dst);
1906 }
1907
1908 /* Try to figure out our local address for this prefix */
1909
1910 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1911 struct inet6_ifaddr * ifp;
1912 struct in6_addr addr;
1913 int create = 0, update_lft = 0;
1914
1915 if (pinfo->prefix_len == 64) {
1916 memcpy(&addr, &pinfo->prefix, 8);
1917 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1918 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1919 in6_dev_put(in6_dev);
1920 return;
1921 }
1922 goto ok;
1923 }
1924 if (net_ratelimit())
1925 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1926 pinfo->prefix_len);
1927 in6_dev_put(in6_dev);
1928 return;
1929
1930 ok:
1931
1932 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1933
1934 if (ifp == NULL && valid_lft) {
1935 int max_addresses = in6_dev->cnf.max_addresses;
1936 u32 addr_flags = 0;
1937
1938 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1939 if (in6_dev->cnf.optimistic_dad &&
1940 !net->ipv6.devconf_all->forwarding && sllao)
1941 addr_flags = IFA_F_OPTIMISTIC;
1942 #endif
1943
1944 /* Do not allow to create too much of autoconfigured
1945 * addresses; this would be too easy way to crash kernel.
1946 */
1947 if (!max_addresses ||
1948 ipv6_count_addresses(in6_dev) < max_addresses)
1949 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1950 addr_type&IPV6_ADDR_SCOPE_MASK,
1951 addr_flags);
1952
1953 if (!ifp || IS_ERR(ifp)) {
1954 in6_dev_put(in6_dev);
1955 return;
1956 }
1957
1958 update_lft = create = 1;
1959 ifp->cstamp = jiffies;
1960 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1961 }
1962
1963 if (ifp) {
1964 int flags;
1965 unsigned long now;
1966 #ifdef CONFIG_IPV6_PRIVACY
1967 struct inet6_ifaddr *ift;
1968 #endif
1969 u32 stored_lft;
1970
1971 /* update lifetime (RFC2462 5.5.3 e) */
1972 spin_lock(&ifp->lock);
1973 now = jiffies;
1974 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1975 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1976 else
1977 stored_lft = 0;
1978 if (!update_lft && stored_lft) {
1979 if (valid_lft > MIN_VALID_LIFETIME ||
1980 valid_lft > stored_lft)
1981 update_lft = 1;
1982 else if (stored_lft <= MIN_VALID_LIFETIME) {
1983 /* valid_lft <= stored_lft is always true */
1984 /*
1985 * RFC 4862 Section 5.5.3e:
1986 * "Note that the preferred lifetime of
1987 * the corresponding address is always
1988 * reset to the Preferred Lifetime in
1989 * the received Prefix Information
1990 * option, regardless of whether the
1991 * valid lifetime is also reset or
1992 * ignored."
1993 *
1994 * So if the preferred lifetime in
1995 * this advertisement is different
1996 * than what we have stored, but the
1997 * valid lifetime is invalid, just
1998 * reset prefered_lft.
1999 *
2000 * We must set the valid lifetime
2001 * to the stored lifetime since we'll
2002 * be updating the timestamp below,
2003 * else we'll set it back to the
2004 * minimum.
2005 */
2006 if (prefered_lft != ifp->prefered_lft) {
2007 valid_lft = stored_lft;
2008 update_lft = 1;
2009 }
2010 } else {
2011 valid_lft = MIN_VALID_LIFETIME;
2012 if (valid_lft < prefered_lft)
2013 prefered_lft = valid_lft;
2014 update_lft = 1;
2015 }
2016 }
2017
2018 if (update_lft) {
2019 ifp->valid_lft = valid_lft;
2020 ifp->prefered_lft = prefered_lft;
2021 ifp->tstamp = now;
2022 flags = ifp->flags;
2023 ifp->flags &= ~IFA_F_DEPRECATED;
2024 spin_unlock(&ifp->lock);
2025
2026 if (!(flags&IFA_F_TENTATIVE))
2027 ipv6_ifa_notify(0, ifp);
2028 } else
2029 spin_unlock(&ifp->lock);
2030
2031 #ifdef CONFIG_IPV6_PRIVACY
2032 read_lock_bh(&in6_dev->lock);
2033 /* update all temporary addresses in the list */
2034 list_for_each_entry(ift, &in6_dev->tempaddr_list,
2035 tmp_list) {
2036 int age, max_valid, max_prefered;
2037
2038 if (ifp != ift->ifpub)
2039 continue;
2040
2041 /*
2042 * RFC 4941 section 3.3:
2043 * If a received option will extend the lifetime
2044 * of a public address, the lifetimes of
2045 * temporary addresses should be extended,
2046 * subject to the overall constraint that no
2047 * temporary addresses should ever remain
2048 * "valid" or "preferred" for a time longer than
2049 * (TEMP_VALID_LIFETIME) or
2050 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR),
2051 * respectively.
2052 */
2053 age = (now - ift->cstamp) / HZ;
2054 max_valid = in6_dev->cnf.temp_valid_lft - age;
2055 if (max_valid < 0)
2056 max_valid = 0;
2057
2058 max_prefered = in6_dev->cnf.temp_prefered_lft -
2059 in6_dev->cnf.max_desync_factor -
2060 age;
2061 if (max_prefered < 0)
2062 max_prefered = 0;
2063
2064 if (valid_lft > max_valid)
2065 valid_lft = max_valid;
2066
2067 if (prefered_lft > max_prefered)
2068 prefered_lft = max_prefered;
2069
2070 spin_lock(&ift->lock);
2071 flags = ift->flags;
2072 ift->valid_lft = valid_lft;
2073 ift->prefered_lft = prefered_lft;
2074 ift->tstamp = now;
2075 if (prefered_lft > 0)
2076 ift->flags &= ~IFA_F_DEPRECATED;
2077
2078 spin_unlock(&ift->lock);
2079 if (!(flags&IFA_F_TENTATIVE))
2080 ipv6_ifa_notify(0, ift);
2081 }
2082
2083 if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) {
2084 /*
2085 * When a new public address is created as
2086 * described in [ADDRCONF], also create a new
2087 * temporary address. Also create a temporary
2088 * address if it's enabled but no temporary
2089 * address currently exists.
2090 */
2091 read_unlock_bh(&in6_dev->lock);
2092 ipv6_create_tempaddr(ifp, NULL);
2093 } else {
2094 read_unlock_bh(&in6_dev->lock);
2095 }
2096 #endif
2097 in6_ifa_put(ifp);
2098 addrconf_verify(0);
2099 }
2100 }
2101 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2102 in6_dev_put(in6_dev);
2103 }
2104
2105 /*
2106 * Set destination address.
2107 * Special case for SIT interfaces where we create a new "virtual"
2108 * device.
2109 */
2110 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2111 {
2112 struct in6_ifreq ireq;
2113 struct net_device *dev;
2114 int err = -EINVAL;
2115
2116 rtnl_lock();
2117
2118 err = -EFAULT;
2119 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2120 goto err_exit;
2121
2122 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2123
2124 err = -ENODEV;
2125 if (dev == NULL)
2126 goto err_exit;
2127
2128 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2129 if (dev->type == ARPHRD_SIT) {
2130 const struct net_device_ops *ops = dev->netdev_ops;
2131 struct ifreq ifr;
2132 struct ip_tunnel_parm p;
2133
2134 err = -EADDRNOTAVAIL;
2135 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2136 goto err_exit;
2137
2138 memset(&p, 0, sizeof(p));
2139 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2140 p.iph.saddr = 0;
2141 p.iph.version = 4;
2142 p.iph.ihl = 5;
2143 p.iph.protocol = IPPROTO_IPV6;
2144 p.iph.ttl = 64;
2145 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2146
2147 if (ops->ndo_do_ioctl) {
2148 mm_segment_t oldfs = get_fs();
2149
2150 set_fs(KERNEL_DS);
2151 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2152 set_fs(oldfs);
2153 } else
2154 err = -EOPNOTSUPP;
2155
2156 if (err == 0) {
2157 err = -ENOBUFS;
2158 dev = __dev_get_by_name(net, p.name);
2159 if (!dev)
2160 goto err_exit;
2161 err = dev_open(dev);
2162 }
2163 }
2164 #endif
2165
2166 err_exit:
2167 rtnl_unlock();
2168 return err;
2169 }
2170
2171 /*
2172 * Manual configuration of address on an interface
2173 */
2174 static int inet6_addr_add(struct net *net, int ifindex, const struct in6_addr *pfx,
2175 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
2176 __u32 valid_lft)
2177 {
2178 struct inet6_ifaddr *ifp;
2179 struct inet6_dev *idev;
2180 struct net_device *dev;
2181 int scope;
2182 u32 flags;
2183 clock_t expires;
2184 unsigned long timeout;
2185
2186 ASSERT_RTNL();
2187
2188 if (plen > 128)
2189 return -EINVAL;
2190
2191 /* check the lifetime */
2192 if (!valid_lft || prefered_lft > valid_lft)
2193 return -EINVAL;
2194
2195 dev = __dev_get_by_index(net, ifindex);
2196 if (!dev)
2197 return -ENODEV;
2198
2199 idev = addrconf_add_dev(dev);
2200 if (IS_ERR(idev))
2201 return PTR_ERR(idev);
2202
2203 scope = ipv6_addr_scope(pfx);
2204
2205 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2206 if (addrconf_finite_timeout(timeout)) {
2207 expires = jiffies_to_clock_t(timeout * HZ);
2208 valid_lft = timeout;
2209 flags = RTF_EXPIRES;
2210 } else {
2211 expires = 0;
2212 flags = 0;
2213 ifa_flags |= IFA_F_PERMANENT;
2214 }
2215
2216 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2217 if (addrconf_finite_timeout(timeout)) {
2218 if (timeout == 0)
2219 ifa_flags |= IFA_F_DEPRECATED;
2220 prefered_lft = timeout;
2221 }
2222
2223 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2224
2225 if (!IS_ERR(ifp)) {
2226 spin_lock_bh(&ifp->lock);
2227 ifp->valid_lft = valid_lft;
2228 ifp->prefered_lft = prefered_lft;
2229 ifp->tstamp = jiffies;
2230 spin_unlock_bh(&ifp->lock);
2231
2232 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2233 expires, flags);
2234 /*
2235 * Note that section 3.1 of RFC 4429 indicates
2236 * that the Optimistic flag should not be set for
2237 * manually configured addresses
2238 */
2239 addrconf_dad_start(ifp, 0);
2240 in6_ifa_put(ifp);
2241 addrconf_verify(0);
2242 return 0;
2243 }
2244
2245 return PTR_ERR(ifp);
2246 }
2247
2248 static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx,
2249 unsigned int plen)
2250 {
2251 struct inet6_ifaddr *ifp;
2252 struct inet6_dev *idev;
2253 struct net_device *dev;
2254
2255 if (plen > 128)
2256 return -EINVAL;
2257
2258 dev = __dev_get_by_index(net, ifindex);
2259 if (!dev)
2260 return -ENODEV;
2261
2262 if ((idev = __in6_dev_get(dev)) == NULL)
2263 return -ENXIO;
2264
2265 read_lock_bh(&idev->lock);
2266 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2267 if (ifp->prefix_len == plen &&
2268 ipv6_addr_equal(pfx, &ifp->addr)) {
2269 in6_ifa_hold(ifp);
2270 read_unlock_bh(&idev->lock);
2271
2272 ipv6_del_addr(ifp);
2273
2274 /* If the last address is deleted administratively,
2275 disable IPv6 on this interface.
2276 */
2277 if (list_empty(&idev->addr_list))
2278 addrconf_ifdown(idev->dev, 1);
2279 return 0;
2280 }
2281 }
2282 read_unlock_bh(&idev->lock);
2283 return -EADDRNOTAVAIL;
2284 }
2285
2286
2287 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2288 {
2289 struct in6_ifreq ireq;
2290 int err;
2291
2292 if (!capable(CAP_NET_ADMIN))
2293 return -EPERM;
2294
2295 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2296 return -EFAULT;
2297
2298 rtnl_lock();
2299 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2300 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2301 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2302 rtnl_unlock();
2303 return err;
2304 }
2305
2306 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2307 {
2308 struct in6_ifreq ireq;
2309 int err;
2310
2311 if (!capable(CAP_NET_ADMIN))
2312 return -EPERM;
2313
2314 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2315 return -EFAULT;
2316
2317 rtnl_lock();
2318 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2319 ireq.ifr6_prefixlen);
2320 rtnl_unlock();
2321 return err;
2322 }
2323
2324 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2325 int plen, int scope)
2326 {
2327 struct inet6_ifaddr *ifp;
2328
2329 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT);
2330 if (!IS_ERR(ifp)) {
2331 spin_lock_bh(&ifp->lock);
2332 ifp->flags &= ~IFA_F_TENTATIVE;
2333 spin_unlock_bh(&ifp->lock);
2334 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2335 in6_ifa_put(ifp);
2336 }
2337 }
2338
2339 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2340 static void sit_add_v4_addrs(struct inet6_dev *idev)
2341 {
2342 struct in6_addr addr;
2343 struct net_device *dev;
2344 struct net *net = dev_net(idev->dev);
2345 int scope;
2346
2347 ASSERT_RTNL();
2348
2349 memset(&addr, 0, sizeof(struct in6_addr));
2350 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2351
2352 if (idev->dev->flags&IFF_POINTOPOINT) {
2353 addr.s6_addr32[0] = htonl(0xfe800000);
2354 scope = IFA_LINK;
2355 } else {
2356 scope = IPV6_ADDR_COMPATv4;
2357 }
2358
2359 if (addr.s6_addr32[3]) {
2360 add_addr(idev, &addr, 128, scope);
2361 return;
2362 }
2363
2364 for_each_netdev(net, dev) {
2365 struct in_device * in_dev = __in_dev_get_rtnl(dev);
2366 if (in_dev && (dev->flags & IFF_UP)) {
2367 struct in_ifaddr * ifa;
2368
2369 int flag = scope;
2370
2371 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2372 int plen;
2373
2374 addr.s6_addr32[3] = ifa->ifa_local;
2375
2376 if (ifa->ifa_scope == RT_SCOPE_LINK)
2377 continue;
2378 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2379 if (idev->dev->flags&IFF_POINTOPOINT)
2380 continue;
2381 flag |= IFA_HOST;
2382 }
2383 if (idev->dev->flags&IFF_POINTOPOINT)
2384 plen = 64;
2385 else
2386 plen = 96;
2387
2388 add_addr(idev, &addr, plen, flag);
2389 }
2390 }
2391 }
2392 }
2393 #endif
2394
2395 static void init_loopback(struct net_device *dev)
2396 {
2397 struct inet6_dev *idev;
2398
2399 /* ::1 */
2400
2401 ASSERT_RTNL();
2402
2403 if ((idev = ipv6_find_idev(dev)) == NULL) {
2404 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2405 return;
2406 }
2407
2408 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2409 }
2410
2411 static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr)
2412 {
2413 struct inet6_ifaddr * ifp;
2414 u32 addr_flags = IFA_F_PERMANENT;
2415
2416 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2417 if (idev->cnf.optimistic_dad &&
2418 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2419 addr_flags |= IFA_F_OPTIMISTIC;
2420 #endif
2421
2422
2423 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2424 if (!IS_ERR(ifp)) {
2425 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2426 addrconf_dad_start(ifp, 0);
2427 in6_ifa_put(ifp);
2428 }
2429 }
2430
2431 static void addrconf_dev_config(struct net_device *dev)
2432 {
2433 struct in6_addr addr;
2434 struct inet6_dev * idev;
2435
2436 ASSERT_RTNL();
2437
2438 if ((dev->type != ARPHRD_ETHER) &&
2439 (dev->type != ARPHRD_FDDI) &&
2440 (dev->type != ARPHRD_IEEE802_TR) &&
2441 (dev->type != ARPHRD_ARCNET) &&
2442 (dev->type != ARPHRD_INFINIBAND)) {
2443 /* Alas, we support only Ethernet autoconfiguration. */
2444 return;
2445 }
2446
2447 idev = addrconf_add_dev(dev);
2448 if (IS_ERR(idev))
2449 return;
2450
2451 memset(&addr, 0, sizeof(struct in6_addr));
2452 addr.s6_addr32[0] = htonl(0xFE800000);
2453
2454 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2455 addrconf_add_linklocal(idev, &addr);
2456 }
2457
2458 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2459 static void addrconf_sit_config(struct net_device *dev)
2460 {
2461 struct inet6_dev *idev;
2462
2463 ASSERT_RTNL();
2464
2465 /*
2466 * Configure the tunnel with one of our IPv4
2467 * addresses... we should configure all of
2468 * our v4 addrs in the tunnel
2469 */
2470
2471 if ((idev = ipv6_find_idev(dev)) == NULL) {
2472 printk(KERN_DEBUG "init sit: add_dev failed\n");
2473 return;
2474 }
2475
2476 if (dev->priv_flags & IFF_ISATAP) {
2477 struct in6_addr addr;
2478
2479 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2480 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2481 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2482 addrconf_add_linklocal(idev, &addr);
2483 return;
2484 }
2485
2486 sit_add_v4_addrs(idev);
2487
2488 if (dev->flags&IFF_POINTOPOINT) {
2489 addrconf_add_mroute(dev);
2490 addrconf_add_lroute(dev);
2491 } else
2492 sit_route_add(dev);
2493 }
2494 #endif
2495
2496 #if defined(CONFIG_NET_IPGRE) || defined(CONFIG_NET_IPGRE_MODULE)
2497 static void addrconf_gre_config(struct net_device *dev)
2498 {
2499 struct inet6_dev *idev;
2500 struct in6_addr addr;
2501
2502 pr_info("ipv6: addrconf_gre_config(%s)\n", dev->name);
2503
2504 ASSERT_RTNL();
2505
2506 if ((idev = ipv6_find_idev(dev)) == NULL) {
2507 printk(KERN_DEBUG "init gre: add_dev failed\n");
2508 return;
2509 }
2510
2511 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2512 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2513
2514 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2515 addrconf_add_linklocal(idev, &addr);
2516 }
2517 #endif
2518
2519 static inline int
2520 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2521 {
2522 struct in6_addr lladdr;
2523
2524 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2525 addrconf_add_linklocal(idev, &lladdr);
2526 return 0;
2527 }
2528 return -1;
2529 }
2530
2531 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2532 {
2533 struct net_device *link_dev;
2534 struct net *net = dev_net(idev->dev);
2535
2536 /* first try to inherit the link-local address from the link device */
2537 if (idev->dev->iflink &&
2538 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
2539 if (!ipv6_inherit_linklocal(idev, link_dev))
2540 return;
2541 }
2542 /* then try to inherit it from any device */
2543 for_each_netdev(net, link_dev) {
2544 if (!ipv6_inherit_linklocal(idev, link_dev))
2545 return;
2546 }
2547 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2548 }
2549
2550 /*
2551 * Autoconfigure tunnel with a link-local address so routing protocols,
2552 * DHCPv6, MLD etc. can be run over the virtual link
2553 */
2554
2555 static void addrconf_ip6_tnl_config(struct net_device *dev)
2556 {
2557 struct inet6_dev *idev;
2558
2559 ASSERT_RTNL();
2560
2561 idev = addrconf_add_dev(dev);
2562 if (IS_ERR(idev)) {
2563 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2564 return;
2565 }
2566 ip6_tnl_add_linklocal(idev);
2567 }
2568
2569 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2570 void * data)
2571 {
2572 struct net_device *dev = (struct net_device *) data;
2573 struct inet6_dev *idev = __in6_dev_get(dev);
2574 int run_pending = 0;
2575 int err;
2576
2577 switch (event) {
2578 case NETDEV_REGISTER:
2579 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2580 idev = ipv6_add_dev(dev);
2581 if (!idev)
2582 return notifier_from_errno(-ENOMEM);
2583 }
2584 break;
2585
2586 case NETDEV_UP:
2587 case NETDEV_CHANGE:
2588 if (dev->flags & IFF_SLAVE)
2589 break;
2590
2591 if (event == NETDEV_UP) {
2592 if (!addrconf_qdisc_ok(dev)) {
2593 /* device is not ready yet. */
2594 printk(KERN_INFO
2595 "ADDRCONF(NETDEV_UP): %s: "
2596 "link is not ready\n",
2597 dev->name);
2598 break;
2599 }
2600
2601 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2602 idev = ipv6_add_dev(dev);
2603
2604 if (idev) {
2605 idev->if_flags |= IF_READY;
2606 run_pending = 1;
2607 }
2608 } else {
2609 if (!addrconf_qdisc_ok(dev)) {
2610 /* device is still not ready. */
2611 break;
2612 }
2613
2614 if (idev) {
2615 if (idev->if_flags & IF_READY)
2616 /* device is already configured. */
2617 break;
2618 idev->if_flags |= IF_READY;
2619 }
2620
2621 printk(KERN_INFO
2622 "ADDRCONF(NETDEV_CHANGE): %s: "
2623 "link becomes ready\n",
2624 dev->name);
2625
2626 run_pending = 1;
2627 }
2628
2629 switch (dev->type) {
2630 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2631 case ARPHRD_SIT:
2632 addrconf_sit_config(dev);
2633 break;
2634 #endif
2635 #if defined(CONFIG_NET_IPGRE) || defined(CONFIG_NET_IPGRE_MODULE)
2636 case ARPHRD_IPGRE:
2637 addrconf_gre_config(dev);
2638 break;
2639 #endif
2640 case ARPHRD_TUNNEL6:
2641 addrconf_ip6_tnl_config(dev);
2642 break;
2643 case ARPHRD_LOOPBACK:
2644 init_loopback(dev);
2645 break;
2646
2647 default:
2648 addrconf_dev_config(dev);
2649 break;
2650 }
2651
2652 if (idev) {
2653 if (run_pending)
2654 addrconf_dad_run(idev);
2655
2656 /*
2657 * If the MTU changed during the interface down,
2658 * when the interface up, the changed MTU must be
2659 * reflected in the idev as well as routers.
2660 */
2661 if (idev->cnf.mtu6 != dev->mtu &&
2662 dev->mtu >= IPV6_MIN_MTU) {
2663 rt6_mtu_change(dev, dev->mtu);
2664 idev->cnf.mtu6 = dev->mtu;
2665 }
2666 idev->tstamp = jiffies;
2667 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2668
2669 /*
2670 * If the changed mtu during down is lower than
2671 * IPV6_MIN_MTU stop IPv6 on this interface.
2672 */
2673 if (dev->mtu < IPV6_MIN_MTU)
2674 addrconf_ifdown(dev, 1);
2675 }
2676 break;
2677
2678 case NETDEV_CHANGEMTU:
2679 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2680 rt6_mtu_change(dev, dev->mtu);
2681 idev->cnf.mtu6 = dev->mtu;
2682 break;
2683 }
2684
2685 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2686 idev = ipv6_add_dev(dev);
2687 if (idev)
2688 break;
2689 }
2690
2691 /*
2692 * MTU falled under IPV6_MIN_MTU.
2693 * Stop IPv6 on this interface.
2694 */
2695
2696 case NETDEV_DOWN:
2697 case NETDEV_UNREGISTER:
2698 /*
2699 * Remove all addresses from this interface.
2700 */
2701 addrconf_ifdown(dev, event != NETDEV_DOWN);
2702 break;
2703
2704 case NETDEV_CHANGENAME:
2705 if (idev) {
2706 snmp6_unregister_dev(idev);
2707 addrconf_sysctl_unregister(idev);
2708 addrconf_sysctl_register(idev);
2709 err = snmp6_register_dev(idev);
2710 if (err)
2711 return notifier_from_errno(err);
2712 }
2713 break;
2714
2715 case NETDEV_PRE_TYPE_CHANGE:
2716 case NETDEV_POST_TYPE_CHANGE:
2717 addrconf_type_change(dev, event);
2718 break;
2719 }
2720
2721 return NOTIFY_OK;
2722 }
2723
2724 /*
2725 * addrconf module should be notified of a device going up
2726 */
2727 static struct notifier_block ipv6_dev_notf = {
2728 .notifier_call = addrconf_notify,
2729 };
2730
2731 static void addrconf_type_change(struct net_device *dev, unsigned long event)
2732 {
2733 struct inet6_dev *idev;
2734 ASSERT_RTNL();
2735
2736 idev = __in6_dev_get(dev);
2737
2738 if (event == NETDEV_POST_TYPE_CHANGE)
2739 ipv6_mc_remap(idev);
2740 else if (event == NETDEV_PRE_TYPE_CHANGE)
2741 ipv6_mc_unmap(idev);
2742 }
2743
2744 static int addrconf_ifdown(struct net_device *dev, int how)
2745 {
2746 struct net *net = dev_net(dev);
2747 struct inet6_dev *idev;
2748 struct inet6_ifaddr *ifa;
2749 int state, i;
2750
2751 ASSERT_RTNL();
2752
2753 rt6_ifdown(net, dev);
2754 neigh_ifdown(&nd_tbl, dev);
2755
2756 idev = __in6_dev_get(dev);
2757 if (idev == NULL)
2758 return -ENODEV;
2759
2760 /*
2761 * Step 1: remove reference to ipv6 device from parent device.
2762 * Do not dev_put!
2763 */
2764 if (how) {
2765 idev->dead = 1;
2766
2767 /* protected by rtnl_lock */
2768 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
2769
2770 /* Step 1.5: remove snmp6 entry */
2771 snmp6_unregister_dev(idev);
2772
2773 }
2774
2775 /* Step 2: clear hash table */
2776 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
2777 struct hlist_head *h = &inet6_addr_lst[i];
2778 struct hlist_node *n;
2779
2780 spin_lock_bh(&addrconf_hash_lock);
2781 restart:
2782 hlist_for_each_entry_rcu(ifa, n, h, addr_lst) {
2783 if (ifa->idev == idev) {
2784 hlist_del_init_rcu(&ifa->addr_lst);
2785 addrconf_del_timer(ifa);
2786 goto restart;
2787 }
2788 }
2789 spin_unlock_bh(&addrconf_hash_lock);
2790 }
2791
2792 write_lock_bh(&idev->lock);
2793
2794 /* Step 2: clear flags for stateless addrconf */
2795 if (!how)
2796 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2797
2798 #ifdef CONFIG_IPV6_PRIVACY
2799 if (how && del_timer(&idev->regen_timer))
2800 in6_dev_put(idev);
2801
2802 /* Step 3: clear tempaddr list */
2803 while (!list_empty(&idev->tempaddr_list)) {
2804 ifa = list_first_entry(&idev->tempaddr_list,
2805 struct inet6_ifaddr, tmp_list);
2806 list_del(&ifa->tmp_list);
2807 write_unlock_bh(&idev->lock);
2808 spin_lock_bh(&ifa->lock);
2809
2810 if (ifa->ifpub) {
2811 in6_ifa_put(ifa->ifpub);
2812 ifa->ifpub = NULL;
2813 }
2814 spin_unlock_bh(&ifa->lock);
2815 in6_ifa_put(ifa);
2816 write_lock_bh(&idev->lock);
2817 }
2818 #endif
2819
2820 while (!list_empty(&idev->addr_list)) {
2821 ifa = list_first_entry(&idev->addr_list,
2822 struct inet6_ifaddr, if_list);
2823 addrconf_del_timer(ifa);
2824
2825 list_del(&ifa->if_list);
2826
2827 write_unlock_bh(&idev->lock);
2828
2829 spin_lock_bh(&ifa->state_lock);
2830 state = ifa->state;
2831 ifa->state = INET6_IFADDR_STATE_DEAD;
2832 spin_unlock_bh(&ifa->state_lock);
2833
2834 if (state != INET6_IFADDR_STATE_DEAD) {
2835 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2836 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2837 }
2838 in6_ifa_put(ifa);
2839
2840 write_lock_bh(&idev->lock);
2841 }
2842
2843 write_unlock_bh(&idev->lock);
2844
2845 /* Step 5: Discard multicast list */
2846 if (how)
2847 ipv6_mc_destroy_dev(idev);
2848 else
2849 ipv6_mc_down(idev);
2850
2851 idev->tstamp = jiffies;
2852
2853 /* Last: Shot the device (if unregistered) */
2854 if (how) {
2855 addrconf_sysctl_unregister(idev);
2856 neigh_parms_release(&nd_tbl, idev->nd_parms);
2857 neigh_ifdown(&nd_tbl, dev);
2858 in6_dev_put(idev);
2859 }
2860 return 0;
2861 }
2862
2863 static void addrconf_rs_timer(unsigned long data)
2864 {
2865 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2866 struct inet6_dev *idev = ifp->idev;
2867
2868 read_lock(&idev->lock);
2869 if (idev->dead || !(idev->if_flags & IF_READY))
2870 goto out;
2871
2872 if (idev->cnf.forwarding)
2873 goto out;
2874
2875 /* Announcement received after solicitation was sent */
2876 if (idev->if_flags & IF_RA_RCVD)
2877 goto out;
2878
2879 spin_lock(&ifp->lock);
2880 if (ifp->probes++ < idev->cnf.rtr_solicits) {
2881 /* The wait after the last probe can be shorter */
2882 addrconf_mod_timer(ifp, AC_RS,
2883 (ifp->probes == idev->cnf.rtr_solicits) ?
2884 idev->cnf.rtr_solicit_delay :
2885 idev->cnf.rtr_solicit_interval);
2886 spin_unlock(&ifp->lock);
2887
2888 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2889 } else {
2890 spin_unlock(&ifp->lock);
2891 /*
2892 * Note: we do not support deprecated "all on-link"
2893 * assumption any longer.
2894 */
2895 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2896 idev->dev->name);
2897 }
2898
2899 out:
2900 read_unlock(&idev->lock);
2901 in6_ifa_put(ifp);
2902 }
2903
2904 /*
2905 * Duplicate Address Detection
2906 */
2907 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2908 {
2909 unsigned long rand_num;
2910 struct inet6_dev *idev = ifp->idev;
2911
2912 if (ifp->flags & IFA_F_OPTIMISTIC)
2913 rand_num = 0;
2914 else
2915 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2916
2917 ifp->probes = idev->cnf.dad_transmits;
2918 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2919 }
2920
2921 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2922 {
2923 struct inet6_dev *idev = ifp->idev;
2924 struct net_device *dev = idev->dev;
2925
2926 addrconf_join_solict(dev, &ifp->addr);
2927
2928 net_srandom(ifp->addr.s6_addr32[3]);
2929
2930 read_lock_bh(&idev->lock);
2931 spin_lock(&ifp->lock);
2932 if (ifp->state == INET6_IFADDR_STATE_DEAD)
2933 goto out;
2934
2935 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2936 idev->cnf.accept_dad < 1 ||
2937 !(ifp->flags&IFA_F_TENTATIVE) ||
2938 ifp->flags & IFA_F_NODAD) {
2939 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
2940 spin_unlock(&ifp->lock);
2941 read_unlock_bh(&idev->lock);
2942
2943 addrconf_dad_completed(ifp);
2944 return;
2945 }
2946
2947 if (!(idev->if_flags & IF_READY)) {
2948 spin_unlock(&ifp->lock);
2949 read_unlock_bh(&idev->lock);
2950 /*
2951 * If the device is not ready:
2952 * - keep it tentative if it is a permanent address.
2953 * - otherwise, kill it.
2954 */
2955 in6_ifa_hold(ifp);
2956 addrconf_dad_stop(ifp, 0);
2957 return;
2958 }
2959
2960 /*
2961 * Optimistic nodes can start receiving
2962 * Frames right away
2963 */
2964 if (ifp->flags & IFA_F_OPTIMISTIC)
2965 ip6_ins_rt(ifp->rt);
2966
2967 addrconf_dad_kick(ifp);
2968 out:
2969 spin_unlock(&ifp->lock);
2970 read_unlock_bh(&idev->lock);
2971 }
2972
2973 static void addrconf_dad_timer(unsigned long data)
2974 {
2975 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2976 struct inet6_dev *idev = ifp->idev;
2977 struct in6_addr mcaddr;
2978
2979 if (!ifp->probes && addrconf_dad_end(ifp))
2980 goto out;
2981
2982 read_lock(&idev->lock);
2983 if (idev->dead || !(idev->if_flags & IF_READY)) {
2984 read_unlock(&idev->lock);
2985 goto out;
2986 }
2987
2988 spin_lock(&ifp->lock);
2989 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
2990 spin_unlock(&ifp->lock);
2991 read_unlock(&idev->lock);
2992 goto out;
2993 }
2994
2995 if (ifp->probes == 0) {
2996 /*
2997 * DAD was successful
2998 */
2999
3000 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3001 spin_unlock(&ifp->lock);
3002 read_unlock(&idev->lock);
3003
3004 addrconf_dad_completed(ifp);
3005
3006 goto out;
3007 }
3008
3009 ifp->probes--;
3010 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
3011 spin_unlock(&ifp->lock);
3012 read_unlock(&idev->lock);
3013
3014 /* send a neighbour solicitation for our addr */
3015 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3016 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
3017 out:
3018 in6_ifa_put(ifp);
3019 }
3020
3021 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3022 {
3023 struct net_device *dev = ifp->idev->dev;
3024
3025 /*
3026 * Configure the address for reception. Now it is valid.
3027 */
3028
3029 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3030
3031 /* If added prefix is link local and we are prepared to process
3032 router advertisements, start sending router solicitations.
3033 */
3034
3035 if (((ifp->idev->cnf.accept_ra == 1 && !ifp->idev->cnf.forwarding) ||
3036 ifp->idev->cnf.accept_ra == 2) &&
3037 ifp->idev->cnf.rtr_solicits > 0 &&
3038 (dev->flags&IFF_LOOPBACK) == 0 &&
3039 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
3040 /*
3041 * If a host as already performed a random delay
3042 * [...] as part of DAD [...] there is no need
3043 * to delay again before sending the first RS
3044 */
3045 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
3046
3047 spin_lock_bh(&ifp->lock);
3048 ifp->probes = 1;
3049 ifp->idev->if_flags |= IF_RS_SENT;
3050 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
3051 spin_unlock_bh(&ifp->lock);
3052 }
3053 }
3054
3055 static void addrconf_dad_run(struct inet6_dev *idev)
3056 {
3057 struct inet6_ifaddr *ifp;
3058
3059 read_lock_bh(&idev->lock);
3060 list_for_each_entry(ifp, &idev->addr_list, if_list) {
3061 spin_lock(&ifp->lock);
3062 if (ifp->flags & IFA_F_TENTATIVE &&
3063 ifp->state == INET6_IFADDR_STATE_DAD)
3064 addrconf_dad_kick(ifp);
3065 spin_unlock(&ifp->lock);
3066 }
3067 read_unlock_bh(&idev->lock);
3068 }
3069
3070 #ifdef CONFIG_PROC_FS
3071 struct if6_iter_state {
3072 struct seq_net_private p;
3073 int bucket;
3074 int offset;
3075 };
3076
3077 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
3078 {
3079 struct inet6_ifaddr *ifa = NULL;
3080 struct if6_iter_state *state = seq->private;
3081 struct net *net = seq_file_net(seq);
3082 int p = 0;
3083
3084 /* initial bucket if pos is 0 */
3085 if (pos == 0) {
3086 state->bucket = 0;
3087 state->offset = 0;
3088 }
3089
3090 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3091 struct hlist_node *n;
3092 hlist_for_each_entry_rcu_bh(ifa, n, &inet6_addr_lst[state->bucket],
3093 addr_lst) {
3094 /* sync with offset */
3095 if (p < state->offset) {
3096 p++;
3097 continue;
3098 }
3099 state->offset++;
3100 if (net_eq(dev_net(ifa->idev->dev), net))
3101 return ifa;
3102 }
3103
3104 /* prepare for next bucket */
3105 state->offset = 0;
3106 p = 0;
3107 }
3108 return NULL;
3109 }
3110
3111 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3112 struct inet6_ifaddr *ifa)
3113 {
3114 struct if6_iter_state *state = seq->private;
3115 struct net *net = seq_file_net(seq);
3116 struct hlist_node *n = &ifa->addr_lst;
3117
3118 hlist_for_each_entry_continue_rcu_bh(ifa, n, addr_lst) {
3119 state->offset++;
3120 if (net_eq(dev_net(ifa->idev->dev), net))
3121 return ifa;
3122 }
3123
3124 while (++state->bucket < IN6_ADDR_HSIZE) {
3125 state->offset = 0;
3126 hlist_for_each_entry_rcu_bh(ifa, n,
3127 &inet6_addr_lst[state->bucket], addr_lst) {
3128 state->offset++;
3129 if (net_eq(dev_net(ifa->idev->dev), net))
3130 return ifa;
3131 }
3132 }
3133
3134 return NULL;
3135 }
3136
3137 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3138 __acquires(rcu_bh)
3139 {
3140 rcu_read_lock_bh();
3141 return if6_get_first(seq, *pos);
3142 }
3143
3144 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3145 {
3146 struct inet6_ifaddr *ifa;
3147
3148 ifa = if6_get_next(seq, v);
3149 ++*pos;
3150 return ifa;
3151 }
3152
3153 static void if6_seq_stop(struct seq_file *seq, void *v)
3154 __releases(rcu_bh)
3155 {
3156 rcu_read_unlock_bh();
3157 }
3158
3159 static int if6_seq_show(struct seq_file *seq, void *v)
3160 {
3161 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3162 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3163 &ifp->addr,
3164 ifp->idev->dev->ifindex,
3165 ifp->prefix_len,
3166 ifp->scope,
3167 ifp->flags,
3168 ifp->idev->dev->name);
3169 return 0;
3170 }
3171
3172 static const struct seq_operations if6_seq_ops = {
3173 .start = if6_seq_start,
3174 .next = if6_seq_next,
3175 .show = if6_seq_show,
3176 .stop = if6_seq_stop,
3177 };
3178
3179 static int if6_seq_open(struct inode *inode, struct file *file)
3180 {
3181 return seq_open_net(inode, file, &if6_seq_ops,
3182 sizeof(struct if6_iter_state));
3183 }
3184
3185 static const struct file_operations if6_fops = {
3186 .owner = THIS_MODULE,
3187 .open = if6_seq_open,
3188 .read = seq_read,
3189 .llseek = seq_lseek,
3190 .release = seq_release_net,
3191 };
3192
3193 static int __net_init if6_proc_net_init(struct net *net)
3194 {
3195 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
3196 return -ENOMEM;
3197 return 0;
3198 }
3199
3200 static void __net_exit if6_proc_net_exit(struct net *net)
3201 {
3202 proc_net_remove(net, "if_inet6");
3203 }
3204
3205 static struct pernet_operations if6_proc_net_ops = {
3206 .init = if6_proc_net_init,
3207 .exit = if6_proc_net_exit,
3208 };
3209
3210 int __init if6_proc_init(void)
3211 {
3212 return register_pernet_subsys(&if6_proc_net_ops);
3213 }
3214
3215 void if6_proc_exit(void)
3216 {
3217 unregister_pernet_subsys(&if6_proc_net_ops);
3218 }
3219 #endif /* CONFIG_PROC_FS */
3220
3221 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3222 /* Check if address is a home address configured on any interface. */
3223 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3224 {
3225 int ret = 0;
3226 struct inet6_ifaddr *ifp = NULL;
3227 struct hlist_node *n;
3228 unsigned int hash = ipv6_addr_hash(addr);
3229
3230 rcu_read_lock_bh();
3231 hlist_for_each_entry_rcu_bh(ifp, n, &inet6_addr_lst[hash], addr_lst) {
3232 if (!net_eq(dev_net(ifp->idev->dev), net))
3233 continue;
3234 if (ipv6_addr_equal(&ifp->addr, addr) &&
3235 (ifp->flags & IFA_F_HOMEADDRESS)) {
3236 ret = 1;
3237 break;
3238 }
3239 }
3240 rcu_read_unlock_bh();
3241 return ret;
3242 }
3243 #endif
3244
3245 /*
3246 * Periodic address status verification
3247 */
3248
3249 static void addrconf_verify(unsigned long foo)
3250 {
3251 unsigned long now, next, next_sec, next_sched;
3252 struct inet6_ifaddr *ifp;
3253 struct hlist_node *node;
3254 int i;
3255
3256 rcu_read_lock_bh();
3257 spin_lock(&addrconf_verify_lock);
3258 now = jiffies;
3259 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3260
3261 del_timer(&addr_chk_timer);
3262
3263 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3264 restart:
3265 hlist_for_each_entry_rcu_bh(ifp, node,
3266 &inet6_addr_lst[i], addr_lst) {
3267 unsigned long age;
3268
3269 if (ifp->flags & IFA_F_PERMANENT)
3270 continue;
3271
3272 spin_lock(&ifp->lock);
3273 /* We try to batch several events at once. */
3274 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3275
3276 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3277 age >= ifp->valid_lft) {
3278 spin_unlock(&ifp->lock);
3279 in6_ifa_hold(ifp);
3280 ipv6_del_addr(ifp);
3281 goto restart;
3282 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3283 spin_unlock(&ifp->lock);
3284 continue;
3285 } else if (age >= ifp->prefered_lft) {
3286 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3287 int deprecate = 0;
3288
3289 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3290 deprecate = 1;
3291 ifp->flags |= IFA_F_DEPRECATED;
3292 }
3293
3294 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3295 next = ifp->tstamp + ifp->valid_lft * HZ;
3296
3297 spin_unlock(&ifp->lock);
3298
3299 if (deprecate) {
3300 in6_ifa_hold(ifp);
3301
3302 ipv6_ifa_notify(0, ifp);
3303 in6_ifa_put(ifp);
3304 goto restart;
3305 }
3306 #ifdef CONFIG_IPV6_PRIVACY
3307 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3308 !(ifp->flags&IFA_F_TENTATIVE)) {
3309 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3310 ifp->idev->cnf.dad_transmits *
3311 ifp->idev->nd_parms->retrans_time / HZ;
3312
3313 if (age >= ifp->prefered_lft - regen_advance) {
3314 struct inet6_ifaddr *ifpub = ifp->ifpub;
3315 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3316 next = ifp->tstamp + ifp->prefered_lft * HZ;
3317 if (!ifp->regen_count && ifpub) {
3318 ifp->regen_count++;
3319 in6_ifa_hold(ifp);
3320 in6_ifa_hold(ifpub);
3321 spin_unlock(&ifp->lock);
3322
3323 spin_lock(&ifpub->lock);
3324 ifpub->regen_count = 0;
3325 spin_unlock(&ifpub->lock);
3326 ipv6_create_tempaddr(ifpub, ifp);
3327 in6_ifa_put(ifpub);
3328 in6_ifa_put(ifp);
3329 goto restart;
3330 }
3331 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3332 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3333 spin_unlock(&ifp->lock);
3334 #endif
3335 } else {
3336 /* ifp->prefered_lft <= ifp->valid_lft */
3337 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3338 next = ifp->tstamp + ifp->prefered_lft * HZ;
3339 spin_unlock(&ifp->lock);
3340 }
3341 }
3342 }
3343
3344 next_sec = round_jiffies_up(next);
3345 next_sched = next;
3346
3347 /* If rounded timeout is accurate enough, accept it. */
3348 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3349 next_sched = next_sec;
3350
3351 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3352 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3353 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3354
3355 ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3356 now, next, next_sec, next_sched));
3357
3358 addr_chk_timer.expires = next_sched;
3359 add_timer(&addr_chk_timer);
3360 spin_unlock(&addrconf_verify_lock);
3361 rcu_read_unlock_bh();
3362 }
3363
3364 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3365 {
3366 struct in6_addr *pfx = NULL;
3367
3368 if (addr)
3369 pfx = nla_data(addr);
3370
3371 if (local) {
3372 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3373 pfx = NULL;
3374 else
3375 pfx = nla_data(local);
3376 }
3377
3378 return pfx;
3379 }
3380
3381 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3382 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3383 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3384 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3385 };
3386
3387 static int
3388 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3389 {
3390 struct net *net = sock_net(skb->sk);
3391 struct ifaddrmsg *ifm;
3392 struct nlattr *tb[IFA_MAX+1];
3393 struct in6_addr *pfx;
3394 int err;
3395
3396 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3397 if (err < 0)
3398 return err;
3399
3400 ifm = nlmsg_data(nlh);
3401 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3402 if (pfx == NULL)
3403 return -EINVAL;
3404
3405 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3406 }
3407
3408 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3409 u32 prefered_lft, u32 valid_lft)
3410 {
3411 u32 flags;
3412 clock_t expires;
3413 unsigned long timeout;
3414
3415 if (!valid_lft || (prefered_lft > valid_lft))
3416 return -EINVAL;
3417
3418 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3419 if (addrconf_finite_timeout(timeout)) {
3420 expires = jiffies_to_clock_t(timeout * HZ);
3421 valid_lft = timeout;
3422 flags = RTF_EXPIRES;
3423 } else {
3424 expires = 0;
3425 flags = 0;
3426 ifa_flags |= IFA_F_PERMANENT;
3427 }
3428
3429 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3430 if (addrconf_finite_timeout(timeout)) {
3431 if (timeout == 0)
3432 ifa_flags |= IFA_F_DEPRECATED;
3433 prefered_lft = timeout;
3434 }
3435
3436 spin_lock_bh(&ifp->lock);
3437 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3438 ifp->tstamp = jiffies;
3439 ifp->valid_lft = valid_lft;
3440 ifp->prefered_lft = prefered_lft;
3441
3442 spin_unlock_bh(&ifp->lock);
3443 if (!(ifp->flags&IFA_F_TENTATIVE))
3444 ipv6_ifa_notify(0, ifp);
3445
3446 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3447 expires, flags);
3448 addrconf_verify(0);
3449
3450 return 0;
3451 }
3452
3453 static int
3454 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3455 {
3456 struct net *net = sock_net(skb->sk);
3457 struct ifaddrmsg *ifm;
3458 struct nlattr *tb[IFA_MAX+1];
3459 struct in6_addr *pfx;
3460 struct inet6_ifaddr *ifa;
3461 struct net_device *dev;
3462 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3463 u8 ifa_flags;
3464 int err;
3465
3466 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3467 if (err < 0)
3468 return err;
3469
3470 ifm = nlmsg_data(nlh);
3471 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3472 if (pfx == NULL)
3473 return -EINVAL;
3474
3475 if (tb[IFA_CACHEINFO]) {
3476 struct ifa_cacheinfo *ci;
3477
3478 ci = nla_data(tb[IFA_CACHEINFO]);
3479 valid_lft = ci->ifa_valid;
3480 preferred_lft = ci->ifa_prefered;
3481 } else {
3482 preferred_lft = INFINITY_LIFE_TIME;
3483 valid_lft = INFINITY_LIFE_TIME;
3484 }
3485
3486 dev = __dev_get_by_index(net, ifm->ifa_index);
3487 if (dev == NULL)
3488 return -ENODEV;
3489
3490 /* We ignore other flags so far. */
3491 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3492
3493 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3494 if (ifa == NULL) {
3495 /*
3496 * It would be best to check for !NLM_F_CREATE here but
3497 * userspace alreay relies on not having to provide this.
3498 */
3499 return inet6_addr_add(net, ifm->ifa_index, pfx,
3500 ifm->ifa_prefixlen, ifa_flags,
3501 preferred_lft, valid_lft);
3502 }
3503
3504 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3505 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3506 err = -EEXIST;
3507 else
3508 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3509
3510 in6_ifa_put(ifa);
3511
3512 return err;
3513 }
3514
3515 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3516 u8 scope, int ifindex)
3517 {
3518 struct ifaddrmsg *ifm;
3519
3520 ifm = nlmsg_data(nlh);
3521 ifm->ifa_family = AF_INET6;
3522 ifm->ifa_prefixlen = prefixlen;
3523 ifm->ifa_flags = flags;
3524 ifm->ifa_scope = scope;
3525 ifm->ifa_index = ifindex;
3526 }
3527
3528 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3529 unsigned long tstamp, u32 preferred, u32 valid)
3530 {
3531 struct ifa_cacheinfo ci;
3532
3533 ci.cstamp = cstamp_delta(cstamp);
3534 ci.tstamp = cstamp_delta(tstamp);
3535 ci.ifa_prefered = preferred;
3536 ci.ifa_valid = valid;
3537
3538 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3539 }
3540
3541 static inline int rt_scope(int ifa_scope)
3542 {
3543 if (ifa_scope & IFA_HOST)
3544 return RT_SCOPE_HOST;
3545 else if (ifa_scope & IFA_LINK)
3546 return RT_SCOPE_LINK;
3547 else if (ifa_scope & IFA_SITE)
3548 return RT_SCOPE_SITE;
3549 else
3550 return RT_SCOPE_UNIVERSE;
3551 }
3552
3553 static inline int inet6_ifaddr_msgsize(void)
3554 {
3555 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3556 + nla_total_size(16) /* IFA_ADDRESS */
3557 + nla_total_size(sizeof(struct ifa_cacheinfo));
3558 }
3559
3560 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3561 u32 pid, u32 seq, int event, unsigned int flags)
3562 {
3563 struct nlmsghdr *nlh;
3564 u32 preferred, valid;
3565
3566 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3567 if (nlh == NULL)
3568 return -EMSGSIZE;
3569
3570 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3571 ifa->idev->dev->ifindex);
3572
3573 if (!(ifa->flags&IFA_F_PERMANENT)) {
3574 preferred = ifa->prefered_lft;
3575 valid = ifa->valid_lft;
3576 if (preferred != INFINITY_LIFE_TIME) {
3577 long tval = (jiffies - ifa->tstamp)/HZ;
3578 if (preferred > tval)
3579 preferred -= tval;
3580 else
3581 preferred = 0;
3582 if (valid != INFINITY_LIFE_TIME) {
3583 if (valid > tval)
3584 valid -= tval;
3585 else
3586 valid = 0;
3587 }
3588 }
3589 } else {
3590 preferred = INFINITY_LIFE_TIME;
3591 valid = INFINITY_LIFE_TIME;
3592 }
3593
3594 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3595 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3596 nlmsg_cancel(skb, nlh);
3597 return -EMSGSIZE;
3598 }
3599
3600 return nlmsg_end(skb, nlh);
3601 }
3602
3603 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3604 u32 pid, u32 seq, int event, u16 flags)
3605 {
3606 struct nlmsghdr *nlh;
3607 u8 scope = RT_SCOPE_UNIVERSE;
3608 int ifindex = ifmca->idev->dev->ifindex;
3609
3610 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3611 scope = RT_SCOPE_SITE;
3612
3613 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3614 if (nlh == NULL)
3615 return -EMSGSIZE;
3616
3617 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3618 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3619 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3620 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3621 nlmsg_cancel(skb, nlh);
3622 return -EMSGSIZE;
3623 }
3624
3625 return nlmsg_end(skb, nlh);
3626 }
3627
3628 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3629 u32 pid, u32 seq, int event, unsigned int flags)
3630 {
3631 struct nlmsghdr *nlh;
3632 u8 scope = RT_SCOPE_UNIVERSE;
3633 int ifindex = ifaca->aca_idev->dev->ifindex;
3634
3635 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3636 scope = RT_SCOPE_SITE;
3637
3638 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3639 if (nlh == NULL)
3640 return -EMSGSIZE;
3641
3642 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3643 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3644 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3645 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3646 nlmsg_cancel(skb, nlh);
3647 return -EMSGSIZE;
3648 }
3649
3650 return nlmsg_end(skb, nlh);
3651 }
3652
3653 enum addr_type_t {
3654 UNICAST_ADDR,
3655 MULTICAST_ADDR,
3656 ANYCAST_ADDR,
3657 };
3658
3659 /* called with rcu_read_lock() */
3660 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3661 struct netlink_callback *cb, enum addr_type_t type,
3662 int s_ip_idx, int *p_ip_idx)
3663 {
3664 struct ifmcaddr6 *ifmca;
3665 struct ifacaddr6 *ifaca;
3666 int err = 1;
3667 int ip_idx = *p_ip_idx;
3668
3669 read_lock_bh(&idev->lock);
3670 switch (type) {
3671 case UNICAST_ADDR: {
3672 struct inet6_ifaddr *ifa;
3673
3674 /* unicast address incl. temp addr */
3675 list_for_each_entry(ifa, &idev->addr_list, if_list) {
3676 if (++ip_idx < s_ip_idx)
3677 continue;
3678 err = inet6_fill_ifaddr(skb, ifa,
3679 NETLINK_CB(cb->skb).pid,
3680 cb->nlh->nlmsg_seq,
3681 RTM_NEWADDR,
3682 NLM_F_MULTI);
3683 if (err <= 0)
3684 break;
3685 }
3686 break;
3687 }
3688 case MULTICAST_ADDR:
3689 /* multicast address */
3690 for (ifmca = idev->mc_list; ifmca;
3691 ifmca = ifmca->next, ip_idx++) {
3692 if (ip_idx < s_ip_idx)
3693 continue;
3694 err = inet6_fill_ifmcaddr(skb, ifmca,
3695 NETLINK_CB(cb->skb).pid,
3696 cb->nlh->nlmsg_seq,
3697 RTM_GETMULTICAST,
3698 NLM_F_MULTI);
3699 if (err <= 0)
3700 break;
3701 }
3702 break;
3703 case ANYCAST_ADDR:
3704 /* anycast address */
3705 for (ifaca = idev->ac_list; ifaca;
3706 ifaca = ifaca->aca_next, ip_idx++) {
3707 if (ip_idx < s_ip_idx)
3708 continue;
3709 err = inet6_fill_ifacaddr(skb, ifaca,
3710 NETLINK_CB(cb->skb).pid,
3711 cb->nlh->nlmsg_seq,
3712 RTM_GETANYCAST,
3713 NLM_F_MULTI);
3714 if (err <= 0)
3715 break;
3716 }
3717 break;
3718 default:
3719 break;
3720 }
3721 read_unlock_bh(&idev->lock);
3722 *p_ip_idx = ip_idx;
3723 return err;
3724 }
3725
3726 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3727 enum addr_type_t type)
3728 {
3729 struct net *net = sock_net(skb->sk);
3730 int h, s_h;
3731 int idx, ip_idx;
3732 int s_idx, s_ip_idx;
3733 struct net_device *dev;
3734 struct inet6_dev *idev;
3735 struct hlist_head *head;
3736 struct hlist_node *node;
3737
3738 s_h = cb->args[0];
3739 s_idx = idx = cb->args[1];
3740 s_ip_idx = ip_idx = cb->args[2];
3741
3742 rcu_read_lock();
3743 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3744 idx = 0;
3745 head = &net->dev_index_head[h];
3746 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3747 if (idx < s_idx)
3748 goto cont;
3749 if (h > s_h || idx > s_idx)
3750 s_ip_idx = 0;
3751 ip_idx = 0;
3752 idev = __in6_dev_get(dev);
3753 if (!idev)
3754 goto cont;
3755
3756 if (in6_dump_addrs(idev, skb, cb, type,
3757 s_ip_idx, &ip_idx) <= 0)
3758 goto done;
3759 cont:
3760 idx++;
3761 }
3762 }
3763 done:
3764 rcu_read_unlock();
3765 cb->args[0] = h;
3766 cb->args[1] = idx;
3767 cb->args[2] = ip_idx;
3768
3769 return skb->len;
3770 }
3771
3772 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3773 {
3774 enum addr_type_t type = UNICAST_ADDR;
3775
3776 return inet6_dump_addr(skb, cb, type);
3777 }
3778
3779 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3780 {
3781 enum addr_type_t type = MULTICAST_ADDR;
3782
3783 return inet6_dump_addr(skb, cb, type);
3784 }
3785
3786
3787 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3788 {
3789 enum addr_type_t type = ANYCAST_ADDR;
3790
3791 return inet6_dump_addr(skb, cb, type);
3792 }
3793
3794 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3795 void *arg)
3796 {
3797 struct net *net = sock_net(in_skb->sk);
3798 struct ifaddrmsg *ifm;
3799 struct nlattr *tb[IFA_MAX+1];
3800 struct in6_addr *addr = NULL;
3801 struct net_device *dev = NULL;
3802 struct inet6_ifaddr *ifa;
3803 struct sk_buff *skb;
3804 int err;
3805
3806 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3807 if (err < 0)
3808 goto errout;
3809
3810 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3811 if (addr == NULL) {
3812 err = -EINVAL;
3813 goto errout;
3814 }
3815
3816 ifm = nlmsg_data(nlh);
3817 if (ifm->ifa_index)
3818 dev = __dev_get_by_index(net, ifm->ifa_index);
3819
3820 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
3821 if (!ifa) {
3822 err = -EADDRNOTAVAIL;
3823 goto errout;
3824 }
3825
3826 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
3827 if (!skb) {
3828 err = -ENOBUFS;
3829 goto errout_ifa;
3830 }
3831
3832 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3833 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3834 if (err < 0) {
3835 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3836 WARN_ON(err == -EMSGSIZE);
3837 kfree_skb(skb);
3838 goto errout_ifa;
3839 }
3840 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
3841 errout_ifa:
3842 in6_ifa_put(ifa);
3843 errout:
3844 return err;
3845 }
3846
3847 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3848 {
3849 struct sk_buff *skb;
3850 struct net *net = dev_net(ifa->idev->dev);
3851 int err = -ENOBUFS;
3852
3853 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3854 if (skb == NULL)
3855 goto errout;
3856
3857 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3858 if (err < 0) {
3859 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3860 WARN_ON(err == -EMSGSIZE);
3861 kfree_skb(skb);
3862 goto errout;
3863 }
3864 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3865 return;
3866 errout:
3867 if (err < 0)
3868 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3869 }
3870
3871 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3872 __s32 *array, int bytes)
3873 {
3874 BUG_ON(bytes < (DEVCONF_MAX * 4));
3875
3876 memset(array, 0, bytes);
3877 array[DEVCONF_FORWARDING] = cnf->forwarding;
3878 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3879 array[DEVCONF_MTU6] = cnf->mtu6;
3880 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3881 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3882 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3883 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3884 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3885 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
3886 jiffies_to_msecs(cnf->rtr_solicit_interval);
3887 array[DEVCONF_RTR_SOLICIT_DELAY] =
3888 jiffies_to_msecs(cnf->rtr_solicit_delay);
3889 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3890 #ifdef CONFIG_IPV6_PRIVACY
3891 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3892 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3893 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3894 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3895 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3896 #endif
3897 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3898 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3899 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3900 #ifdef CONFIG_IPV6_ROUTER_PREF
3901 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3902 array[DEVCONF_RTR_PROBE_INTERVAL] =
3903 jiffies_to_msecs(cnf->rtr_probe_interval);
3904 #ifdef CONFIG_IPV6_ROUTE_INFO
3905 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3906 #endif
3907 #endif
3908 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3909 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3910 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3911 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3912 #endif
3913 #ifdef CONFIG_IPV6_MROUTE
3914 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
3915 #endif
3916 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
3917 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
3918 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
3919 }
3920
3921 static inline size_t inet6_ifla6_size(void)
3922 {
3923 return nla_total_size(4) /* IFLA_INET6_FLAGS */
3924 + nla_total_size(sizeof(struct ifla_cacheinfo))
3925 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3926 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3927 + nla_total_size(ICMP6_MIB_MAX * 8); /* IFLA_INET6_ICMP6STATS */
3928 }
3929
3930 static inline size_t inet6_if_nlmsg_size(void)
3931 {
3932 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3933 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3934 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3935 + nla_total_size(4) /* IFLA_MTU */
3936 + nla_total_size(4) /* IFLA_LINK */
3937 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
3938 }
3939
3940 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
3941 int items, int bytes)
3942 {
3943 int i;
3944 int pad = bytes - sizeof(u64) * items;
3945 BUG_ON(pad < 0);
3946
3947 /* Use put_unaligned() because stats may not be aligned for u64. */
3948 put_unaligned(items, &stats[0]);
3949 for (i = 1; i < items; i++)
3950 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
3951
3952 memset(&stats[items], 0, pad);
3953 }
3954
3955 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib,
3956 int items, int bytes, size_t syncpoff)
3957 {
3958 int i;
3959 int pad = bytes - sizeof(u64) * items;
3960 BUG_ON(pad < 0);
3961
3962 /* Use put_unaligned() because stats may not be aligned for u64. */
3963 put_unaligned(items, &stats[0]);
3964 for (i = 1; i < items; i++)
3965 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
3966
3967 memset(&stats[items], 0, pad);
3968 }
3969
3970 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3971 int bytes)
3972 {
3973 switch (attrtype) {
3974 case IFLA_INET6_STATS:
3975 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6,
3976 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
3977 break;
3978 case IFLA_INET6_ICMP6STATS:
3979 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
3980 break;
3981 }
3982 }
3983
3984 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
3985 {
3986 struct nlattr *nla;
3987 struct ifla_cacheinfo ci;
3988
3989 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
3990
3991 ci.max_reasm_len = IPV6_MAXPLEN;
3992 ci.tstamp = cstamp_delta(idev->tstamp);
3993 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
3994 ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time);
3995 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3996
3997 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3998 if (nla == NULL)
3999 goto nla_put_failure;
4000 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4001
4002 /* XXX - MC not implemented */
4003
4004 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4005 if (nla == NULL)
4006 goto nla_put_failure;
4007 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4008
4009 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4010 if (nla == NULL)
4011 goto nla_put_failure;
4012 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4013
4014 return 0;
4015
4016 nla_put_failure:
4017 return -EMSGSIZE;
4018 }
4019
4020 static size_t inet6_get_link_af_size(const struct net_device *dev)
4021 {
4022 if (!__in6_dev_get(dev))
4023 return 0;
4024
4025 return inet6_ifla6_size();
4026 }
4027
4028 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
4029 {
4030 struct inet6_dev *idev = __in6_dev_get(dev);
4031
4032 if (!idev)
4033 return -ENODATA;
4034
4035 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4036 return -EMSGSIZE;
4037
4038 return 0;
4039 }
4040
4041 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
4042 u32 pid, u32 seq, int event, unsigned int flags)
4043 {
4044 struct net_device *dev = idev->dev;
4045 struct ifinfomsg *hdr;
4046 struct nlmsghdr *nlh;
4047 void *protoinfo;
4048
4049 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
4050 if (nlh == NULL)
4051 return -EMSGSIZE;
4052
4053 hdr = nlmsg_data(nlh);
4054 hdr->ifi_family = AF_INET6;
4055 hdr->__ifi_pad = 0;
4056 hdr->ifi_type = dev->type;
4057 hdr->ifi_index = dev->ifindex;
4058 hdr->ifi_flags = dev_get_flags(dev);
4059 hdr->ifi_change = 0;
4060
4061 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
4062
4063 if (dev->addr_len)
4064 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
4065
4066 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
4067 if (dev->ifindex != dev->iflink)
4068 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
4069
4070 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4071 if (protoinfo == NULL)
4072 goto nla_put_failure;
4073
4074 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4075 goto nla_put_failure;
4076
4077 nla_nest_end(skb, protoinfo);
4078 return nlmsg_end(skb, nlh);
4079
4080 nla_put_failure:
4081 nlmsg_cancel(skb, nlh);
4082 return -EMSGSIZE;
4083 }
4084
4085 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4086 {
4087 struct net *net = sock_net(skb->sk);
4088 int h, s_h;
4089 int idx = 0, s_idx;
4090 struct net_device *dev;
4091 struct inet6_dev *idev;
4092 struct hlist_head *head;
4093 struct hlist_node *node;
4094
4095 s_h = cb->args[0];
4096 s_idx = cb->args[1];
4097
4098 rcu_read_lock();
4099 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4100 idx = 0;
4101 head = &net->dev_index_head[h];
4102 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
4103 if (idx < s_idx)
4104 goto cont;
4105 idev = __in6_dev_get(dev);
4106 if (!idev)
4107 goto cont;
4108 if (inet6_fill_ifinfo(skb, idev,
4109 NETLINK_CB(cb->skb).pid,
4110 cb->nlh->nlmsg_seq,
4111 RTM_NEWLINK, NLM_F_MULTI) <= 0)
4112 goto out;
4113 cont:
4114 idx++;
4115 }
4116 }
4117 out:
4118 rcu_read_unlock();
4119 cb->args[1] = idx;
4120 cb->args[0] = h;
4121
4122 return skb->len;
4123 }
4124
4125 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4126 {
4127 struct sk_buff *skb;
4128 struct net *net = dev_net(idev->dev);
4129 int err = -ENOBUFS;
4130
4131 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
4132 if (skb == NULL)
4133 goto errout;
4134
4135 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
4136 if (err < 0) {
4137 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4138 WARN_ON(err == -EMSGSIZE);
4139 kfree_skb(skb);
4140 goto errout;
4141 }
4142 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
4143 return;
4144 errout:
4145 if (err < 0)
4146 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
4147 }
4148
4149 static inline size_t inet6_prefix_nlmsg_size(void)
4150 {
4151 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4152 + nla_total_size(sizeof(struct in6_addr))
4153 + nla_total_size(sizeof(struct prefix_cacheinfo));
4154 }
4155
4156 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
4157 struct prefix_info *pinfo, u32 pid, u32 seq,
4158 int event, unsigned int flags)
4159 {
4160 struct prefixmsg *pmsg;
4161 struct nlmsghdr *nlh;
4162 struct prefix_cacheinfo ci;
4163
4164 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
4165 if (nlh == NULL)
4166 return -EMSGSIZE;
4167
4168 pmsg = nlmsg_data(nlh);
4169 pmsg->prefix_family = AF_INET6;
4170 pmsg->prefix_pad1 = 0;
4171 pmsg->prefix_pad2 = 0;
4172 pmsg->prefix_ifindex = idev->dev->ifindex;
4173 pmsg->prefix_len = pinfo->prefix_len;
4174 pmsg->prefix_type = pinfo->type;
4175 pmsg->prefix_pad3 = 0;
4176 pmsg->prefix_flags = 0;
4177 if (pinfo->onlink)
4178 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4179 if (pinfo->autoconf)
4180 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4181
4182 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
4183
4184 ci.preferred_time = ntohl(pinfo->prefered);
4185 ci.valid_time = ntohl(pinfo->valid);
4186 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
4187
4188 return nlmsg_end(skb, nlh);
4189
4190 nla_put_failure:
4191 nlmsg_cancel(skb, nlh);
4192 return -EMSGSIZE;
4193 }
4194
4195 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
4196 struct prefix_info *pinfo)
4197 {
4198 struct sk_buff *skb;
4199 struct net *net = dev_net(idev->dev);
4200 int err = -ENOBUFS;
4201
4202 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
4203 if (skb == NULL)
4204 goto errout;
4205
4206 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
4207 if (err < 0) {
4208 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4209 WARN_ON(err == -EMSGSIZE);
4210 kfree_skb(skb);
4211 goto errout;
4212 }
4213 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4214 return;
4215 errout:
4216 if (err < 0)
4217 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
4218 }
4219
4220 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4221 {
4222 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4223
4224 switch (event) {
4225 case RTM_NEWADDR:
4226 /*
4227 * If the address was optimistic
4228 * we inserted the route at the start of
4229 * our DAD process, so we don't need
4230 * to do it again
4231 */
4232 if (!(ifp->rt->rt6i_node))
4233 ip6_ins_rt(ifp->rt);
4234 if (ifp->idev->cnf.forwarding)
4235 addrconf_join_anycast(ifp);
4236 break;
4237 case RTM_DELADDR:
4238 if (ifp->idev->cnf.forwarding)
4239 addrconf_leave_anycast(ifp);
4240 addrconf_leave_solict(ifp->idev, &ifp->addr);
4241 dst_hold(&ifp->rt->dst);
4242
4243 if (ip6_del_rt(ifp->rt))
4244 dst_free(&ifp->rt->dst);
4245 break;
4246 }
4247 }
4248
4249 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4250 {
4251 rcu_read_lock_bh();
4252 if (likely(ifp->idev->dead == 0))
4253 __ipv6_ifa_notify(event, ifp);
4254 rcu_read_unlock_bh();
4255 }
4256
4257 #ifdef CONFIG_SYSCTL
4258
4259 static
4260 int addrconf_sysctl_forward(ctl_table *ctl, int write,
4261 void __user *buffer, size_t *lenp, loff_t *ppos)
4262 {
4263 int *valp = ctl->data;
4264 int val = *valp;
4265 loff_t pos = *ppos;
4266 ctl_table lctl;
4267 int ret;
4268
4269 /*
4270 * ctl->data points to idev->cnf.forwarding, we should
4271 * not modify it until we get the rtnl lock.
4272 */
4273 lctl = *ctl;
4274 lctl.data = &val;
4275
4276 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4277
4278 if (write)
4279 ret = addrconf_fixup_forwarding(ctl, valp, val);
4280 if (ret)
4281 *ppos = pos;
4282 return ret;
4283 }
4284
4285 static void dev_disable_change(struct inet6_dev *idev)
4286 {
4287 if (!idev || !idev->dev)
4288 return;
4289
4290 if (idev->cnf.disable_ipv6)
4291 addrconf_notify(NULL, NETDEV_DOWN, idev->dev);
4292 else
4293 addrconf_notify(NULL, NETDEV_UP, idev->dev);
4294 }
4295
4296 static void addrconf_disable_change(struct net *net, __s32 newf)
4297 {
4298 struct net_device *dev;
4299 struct inet6_dev *idev;
4300
4301 rcu_read_lock();
4302 for_each_netdev_rcu(net, dev) {
4303 idev = __in6_dev_get(dev);
4304 if (idev) {
4305 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4306 idev->cnf.disable_ipv6 = newf;
4307 if (changed)
4308 dev_disable_change(idev);
4309 }
4310 }
4311 rcu_read_unlock();
4312 }
4313
4314 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
4315 {
4316 struct net *net;
4317 int old;
4318
4319 if (!rtnl_trylock())
4320 return restart_syscall();
4321
4322 net = (struct net *)table->extra2;
4323 old = *p;
4324 *p = newf;
4325
4326 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
4327 rtnl_unlock();
4328 return 0;
4329 }
4330
4331 if (p == &net->ipv6.devconf_all->disable_ipv6) {
4332 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4333 addrconf_disable_change(net, newf);
4334 } else if ((!newf) ^ (!old))
4335 dev_disable_change((struct inet6_dev *)table->extra1);
4336
4337 rtnl_unlock();
4338 return 0;
4339 }
4340
4341 static
4342 int addrconf_sysctl_disable(ctl_table *ctl, int write,
4343 void __user *buffer, size_t *lenp, loff_t *ppos)
4344 {
4345 int *valp = ctl->data;
4346 int val = *valp;
4347 loff_t pos = *ppos;
4348 ctl_table lctl;
4349 int ret;
4350
4351 /*
4352 * ctl->data points to idev->cnf.disable_ipv6, we should
4353 * not modify it until we get the rtnl lock.
4354 */
4355 lctl = *ctl;
4356 lctl.data = &val;
4357
4358 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4359
4360 if (write)
4361 ret = addrconf_disable_ipv6(ctl, valp, val);
4362 if (ret)
4363 *ppos = pos;
4364 return ret;
4365 }
4366
4367 static struct addrconf_sysctl_table
4368 {
4369 struct ctl_table_header *sysctl_header;
4370 ctl_table addrconf_vars[DEVCONF_MAX+1];
4371 char *dev_name;
4372 } addrconf_sysctl __read_mostly = {
4373 .sysctl_header = NULL,
4374 .addrconf_vars = {
4375 {
4376 .procname = "forwarding",
4377 .data = &ipv6_devconf.forwarding,
4378 .maxlen = sizeof(int),
4379 .mode = 0644,
4380 .proc_handler = addrconf_sysctl_forward,
4381 },
4382 {
4383 .procname = "hop_limit",
4384 .data = &ipv6_devconf.hop_limit,
4385 .maxlen = sizeof(int),
4386 .mode = 0644,
4387 .proc_handler = proc_dointvec,
4388 },
4389 {
4390 .procname = "mtu",
4391 .data = &ipv6_devconf.mtu6,
4392 .maxlen = sizeof(int),
4393 .mode = 0644,
4394 .proc_handler = proc_dointvec,
4395 },
4396 {
4397 .procname = "accept_ra",
4398 .data = &ipv6_devconf.accept_ra,
4399 .maxlen = sizeof(int),
4400 .mode = 0644,
4401 .proc_handler = proc_dointvec,
4402 },
4403 {
4404 .procname = "accept_redirects",
4405 .data = &ipv6_devconf.accept_redirects,
4406 .maxlen = sizeof(int),
4407 .mode = 0644,
4408 .proc_handler = proc_dointvec,
4409 },
4410 {
4411 .procname = "autoconf",
4412 .data = &ipv6_devconf.autoconf,
4413 .maxlen = sizeof(int),
4414 .mode = 0644,
4415 .proc_handler = proc_dointvec,
4416 },
4417 {
4418 .procname = "dad_transmits",
4419 .data = &ipv6_devconf.dad_transmits,
4420 .maxlen = sizeof(int),
4421 .mode = 0644,
4422 .proc_handler = proc_dointvec,
4423 },
4424 {
4425 .procname = "router_solicitations",
4426 .data = &ipv6_devconf.rtr_solicits,
4427 .maxlen = sizeof(int),
4428 .mode = 0644,
4429 .proc_handler = proc_dointvec,
4430 },
4431 {
4432 .procname = "router_solicitation_interval",
4433 .data = &ipv6_devconf.rtr_solicit_interval,
4434 .maxlen = sizeof(int),
4435 .mode = 0644,
4436 .proc_handler = proc_dointvec_jiffies,
4437 },
4438 {
4439 .procname = "router_solicitation_delay",
4440 .data = &ipv6_devconf.rtr_solicit_delay,
4441 .maxlen = sizeof(int),
4442 .mode = 0644,
4443 .proc_handler = proc_dointvec_jiffies,
4444 },
4445 {
4446 .procname = "force_mld_version",
4447 .data = &ipv6_devconf.force_mld_version,
4448 .maxlen = sizeof(int),
4449 .mode = 0644,
4450 .proc_handler = proc_dointvec,
4451 },
4452 #ifdef CONFIG_IPV6_PRIVACY
4453 {
4454 .procname = "use_tempaddr",
4455 .data = &ipv6_devconf.use_tempaddr,
4456 .maxlen = sizeof(int),
4457 .mode = 0644,
4458 .proc_handler = proc_dointvec,
4459 },
4460 {
4461 .procname = "temp_valid_lft",
4462 .data = &ipv6_devconf.temp_valid_lft,
4463 .maxlen = sizeof(int),
4464 .mode = 0644,
4465 .proc_handler = proc_dointvec,
4466 },
4467 {
4468 .procname = "temp_prefered_lft",
4469 .data = &ipv6_devconf.temp_prefered_lft,
4470 .maxlen = sizeof(int),
4471 .mode = 0644,
4472 .proc_handler = proc_dointvec,
4473 },
4474 {
4475 .procname = "regen_max_retry",
4476 .data = &ipv6_devconf.regen_max_retry,
4477 .maxlen = sizeof(int),
4478 .mode = 0644,
4479 .proc_handler = proc_dointvec,
4480 },
4481 {
4482 .procname = "max_desync_factor",
4483 .data = &ipv6_devconf.max_desync_factor,
4484 .maxlen = sizeof(int),
4485 .mode = 0644,
4486 .proc_handler = proc_dointvec,
4487 },
4488 #endif
4489 {
4490 .procname = "max_addresses",
4491 .data = &ipv6_devconf.max_addresses,
4492 .maxlen = sizeof(int),
4493 .mode = 0644,
4494 .proc_handler = proc_dointvec,
4495 },
4496 {
4497 .procname = "accept_ra_defrtr",
4498 .data = &ipv6_devconf.accept_ra_defrtr,
4499 .maxlen = sizeof(int),
4500 .mode = 0644,
4501 .proc_handler = proc_dointvec,
4502 },
4503 {
4504 .procname = "accept_ra_pinfo",
4505 .data = &ipv6_devconf.accept_ra_pinfo,
4506 .maxlen = sizeof(int),
4507 .mode = 0644,
4508 .proc_handler = proc_dointvec,
4509 },
4510 #ifdef CONFIG_IPV6_ROUTER_PREF
4511 {
4512 .procname = "accept_ra_rtr_pref",
4513 .data = &ipv6_devconf.accept_ra_rtr_pref,
4514 .maxlen = sizeof(int),
4515 .mode = 0644,
4516 .proc_handler = proc_dointvec,
4517 },
4518 {
4519 .procname = "router_probe_interval",
4520 .data = &ipv6_devconf.rtr_probe_interval,
4521 .maxlen = sizeof(int),
4522 .mode = 0644,
4523 .proc_handler = proc_dointvec_jiffies,
4524 },
4525 #ifdef CONFIG_IPV6_ROUTE_INFO
4526 {
4527 .procname = "accept_ra_rt_info_max_plen",
4528 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4529 .maxlen = sizeof(int),
4530 .mode = 0644,
4531 .proc_handler = proc_dointvec,
4532 },
4533 #endif
4534 #endif
4535 {
4536 .procname = "proxy_ndp",
4537 .data = &ipv6_devconf.proxy_ndp,
4538 .maxlen = sizeof(int),
4539 .mode = 0644,
4540 .proc_handler = proc_dointvec,
4541 },
4542 {
4543 .procname = "accept_source_route",
4544 .data = &ipv6_devconf.accept_source_route,
4545 .maxlen = sizeof(int),
4546 .mode = 0644,
4547 .proc_handler = proc_dointvec,
4548 },
4549 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4550 {
4551 .procname = "optimistic_dad",
4552 .data = &ipv6_devconf.optimistic_dad,
4553 .maxlen = sizeof(int),
4554 .mode = 0644,
4555 .proc_handler = proc_dointvec,
4556
4557 },
4558 #endif
4559 #ifdef CONFIG_IPV6_MROUTE
4560 {
4561 .procname = "mc_forwarding",
4562 .data = &ipv6_devconf.mc_forwarding,
4563 .maxlen = sizeof(int),
4564 .mode = 0444,
4565 .proc_handler = proc_dointvec,
4566 },
4567 #endif
4568 {
4569 .procname = "disable_ipv6",
4570 .data = &ipv6_devconf.disable_ipv6,
4571 .maxlen = sizeof(int),
4572 .mode = 0644,
4573 .proc_handler = addrconf_sysctl_disable,
4574 },
4575 {
4576 .procname = "accept_dad",
4577 .data = &ipv6_devconf.accept_dad,
4578 .maxlen = sizeof(int),
4579 .mode = 0644,
4580 .proc_handler = proc_dointvec,
4581 },
4582 {
4583 .procname = "force_tllao",
4584 .data = &ipv6_devconf.force_tllao,
4585 .maxlen = sizeof(int),
4586 .mode = 0644,
4587 .proc_handler = proc_dointvec
4588 },
4589 {
4590 /* sentinel */
4591 }
4592 },
4593 };
4594
4595 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4596 struct inet6_dev *idev, struct ipv6_devconf *p)
4597 {
4598 int i;
4599 struct addrconf_sysctl_table *t;
4600
4601 #define ADDRCONF_CTL_PATH_DEV 3
4602
4603 struct ctl_path addrconf_ctl_path[] = {
4604 { .procname = "net", },
4605 { .procname = "ipv6", },
4606 { .procname = "conf", },
4607 { /* to be set */ },
4608 { },
4609 };
4610
4611
4612 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4613 if (t == NULL)
4614 goto out;
4615
4616 for (i = 0; t->addrconf_vars[i].data; i++) {
4617 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
4618 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4619 t->addrconf_vars[i].extra2 = net;
4620 }
4621
4622 /*
4623 * Make a copy of dev_name, because '.procname' is regarded as const
4624 * by sysctl and we wouldn't want anyone to change it under our feet
4625 * (see SIOCSIFNAME).
4626 */
4627 t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4628 if (!t->dev_name)
4629 goto free;
4630
4631 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
4632
4633 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
4634 t->addrconf_vars);
4635 if (t->sysctl_header == NULL)
4636 goto free_procname;
4637
4638 p->sysctl = t;
4639 return 0;
4640
4641 free_procname:
4642 kfree(t->dev_name);
4643 free:
4644 kfree(t);
4645 out:
4646 return -ENOBUFS;
4647 }
4648
4649 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4650 {
4651 struct addrconf_sysctl_table *t;
4652
4653 if (p->sysctl == NULL)
4654 return;
4655
4656 t = p->sysctl;
4657 p->sysctl = NULL;
4658 unregister_net_sysctl_table(t->sysctl_header);
4659 kfree(t->dev_name);
4660 kfree(t);
4661 }
4662
4663 static void addrconf_sysctl_register(struct inet6_dev *idev)
4664 {
4665 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
4666 &ndisc_ifinfo_sysctl_change);
4667 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
4668 idev, &idev->cnf);
4669 }
4670
4671 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
4672 {
4673 __addrconf_sysctl_unregister(&idev->cnf);
4674 neigh_sysctl_unregister(idev->nd_parms);
4675 }
4676
4677
4678 #endif
4679
4680 static int __net_init addrconf_init_net(struct net *net)
4681 {
4682 int err;
4683 struct ipv6_devconf *all, *dflt;
4684
4685 err = -ENOMEM;
4686 all = &ipv6_devconf;
4687 dflt = &ipv6_devconf_dflt;
4688
4689 if (!net_eq(net, &init_net)) {
4690 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4691 if (all == NULL)
4692 goto err_alloc_all;
4693
4694 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4695 if (dflt == NULL)
4696 goto err_alloc_dflt;
4697 } else {
4698 /* these will be inherited by all namespaces */
4699 dflt->autoconf = ipv6_defaults.autoconf;
4700 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
4701 }
4702
4703 net->ipv6.devconf_all = all;
4704 net->ipv6.devconf_dflt = dflt;
4705
4706 #ifdef CONFIG_SYSCTL
4707 err = __addrconf_sysctl_register(net, "all", NULL, all);
4708 if (err < 0)
4709 goto err_reg_all;
4710
4711 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
4712 if (err < 0)
4713 goto err_reg_dflt;
4714 #endif
4715 return 0;
4716
4717 #ifdef CONFIG_SYSCTL
4718 err_reg_dflt:
4719 __addrconf_sysctl_unregister(all);
4720 err_reg_all:
4721 kfree(dflt);
4722 #endif
4723 err_alloc_dflt:
4724 kfree(all);
4725 err_alloc_all:
4726 return err;
4727 }
4728
4729 static void __net_exit addrconf_exit_net(struct net *net)
4730 {
4731 #ifdef CONFIG_SYSCTL
4732 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4733 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4734 #endif
4735 if (!net_eq(net, &init_net)) {
4736 kfree(net->ipv6.devconf_dflt);
4737 kfree(net->ipv6.devconf_all);
4738 }
4739 }
4740
4741 static struct pernet_operations addrconf_ops = {
4742 .init = addrconf_init_net,
4743 .exit = addrconf_exit_net,
4744 };
4745
4746 /*
4747 * Device notifier
4748 */
4749
4750 int register_inet6addr_notifier(struct notifier_block *nb)
4751 {
4752 return atomic_notifier_chain_register(&inet6addr_chain, nb);
4753 }
4754 EXPORT_SYMBOL(register_inet6addr_notifier);
4755
4756 int unregister_inet6addr_notifier(struct notifier_block *nb)
4757 {
4758 return atomic_notifier_chain_unregister(&inet6addr_chain, nb);
4759 }
4760 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4761
4762 static struct rtnl_af_ops inet6_ops = {
4763 .family = AF_INET6,
4764 .fill_link_af = inet6_fill_link_af,
4765 .get_link_af_size = inet6_get_link_af_size,
4766 };
4767
4768 /*
4769 * Init / cleanup code
4770 */
4771
4772 int __init addrconf_init(void)
4773 {
4774 int i, err;
4775
4776 err = ipv6_addr_label_init();
4777 if (err < 0) {
4778 printk(KERN_CRIT "IPv6 Addrconf:"
4779 " cannot initialize default policy table: %d.\n", err);
4780 goto out;
4781 }
4782
4783 err = register_pernet_subsys(&addrconf_ops);
4784 if (err < 0)
4785 goto out_addrlabel;
4786
4787 /* The addrconf netdev notifier requires that loopback_dev
4788 * has it's ipv6 private information allocated and setup
4789 * before it can bring up and give link-local addresses
4790 * to other devices which are up.
4791 *
4792 * Unfortunately, loopback_dev is not necessarily the first
4793 * entry in the global dev_base list of net devices. In fact,
4794 * it is likely to be the very last entry on that list.
4795 * So this causes the notifier registry below to try and
4796 * give link-local addresses to all devices besides loopback_dev
4797 * first, then loopback_dev, which cases all the non-loopback_dev
4798 * devices to fail to get a link-local address.
4799 *
4800 * So, as a temporary fix, allocate the ipv6 structure for
4801 * loopback_dev first by hand.
4802 * Longer term, all of the dependencies ipv6 has upon the loopback
4803 * device and it being up should be removed.
4804 */
4805 rtnl_lock();
4806 if (!ipv6_add_dev(init_net.loopback_dev))
4807 err = -ENOMEM;
4808 rtnl_unlock();
4809 if (err)
4810 goto errlo;
4811
4812 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4813 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
4814
4815 register_netdevice_notifier(&ipv6_dev_notf);
4816
4817 addrconf_verify(0);
4818
4819 err = rtnl_af_register(&inet6_ops);
4820 if (err < 0)
4821 goto errout_af;
4822
4823 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
4824 NULL);
4825 if (err < 0)
4826 goto errout;
4827
4828 /* Only the first call to __rtnl_register can fail */
4829 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
4830 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
4831 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
4832 inet6_dump_ifaddr, NULL);
4833 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
4834 inet6_dump_ifmcaddr, NULL);
4835 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
4836 inet6_dump_ifacaddr, NULL);
4837
4838 ipv6_addr_label_rtnl_register();
4839
4840 return 0;
4841 errout:
4842 rtnl_af_unregister(&inet6_ops);
4843 errout_af:
4844 unregister_netdevice_notifier(&ipv6_dev_notf);
4845 errlo:
4846 unregister_pernet_subsys(&addrconf_ops);
4847 out_addrlabel:
4848 ipv6_addr_label_cleanup();
4849 out:
4850 return err;
4851 }
4852
4853 void addrconf_cleanup(void)
4854 {
4855 struct net_device *dev;
4856 int i;
4857
4858 unregister_netdevice_notifier(&ipv6_dev_notf);
4859 unregister_pernet_subsys(&addrconf_ops);
4860 ipv6_addr_label_cleanup();
4861
4862 rtnl_lock();
4863
4864 __rtnl_af_unregister(&inet6_ops);
4865
4866 /* clean dev list */
4867 for_each_netdev(&init_net, dev) {
4868 if (__in6_dev_get(dev) == NULL)
4869 continue;
4870 addrconf_ifdown(dev, 1);
4871 }
4872 addrconf_ifdown(init_net.loopback_dev, 2);
4873
4874 /*
4875 * Check hash table.
4876 */
4877 spin_lock_bh(&addrconf_hash_lock);
4878 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4879 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
4880 spin_unlock_bh(&addrconf_hash_lock);
4881
4882 del_timer(&addr_chk_timer);
4883 rtnl_unlock();
4884 }
Linux kernel - Deliverables
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