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ksm: fix NULL pointer dereference in scan_get_next_rmap_item()
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / ipv6 / addrconf.c
bloba7bda0757053278e58218766df54cb49fac100d6
1 /*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 */
14
15 /*
16 * Changes:
17 *
18 * Janos Farkas : delete timer on ifdown
19 * <chexum@bankinf.banki.hu>
20 * Andi Kleen : kill double kfree on module
21 * unload.
22 * Maciej W. Rozycki : FDDI support
23 * sekiya@USAGI : Don't send too many RS
24 * packets.
25 * yoshfuji@USAGI : Fixed interval between DAD
26 * packets.
27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
28 * address validation timer.
29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
30 * support.
31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
32 * address on a same interface.
33 * YOSHIFUJI Hideaki @USAGI : ARCnet support
34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
35 * seq_file.
36 * YOSHIFUJI Hideaki @USAGI : improved source address
37 * selection; consider scope,
38 * status etc.
39 */
40
41 #include <linux/errno.h>
42 #include <linux/types.h>
43 #include <linux/kernel.h>
44 #include <linux/socket.h>
45 #include <linux/sockios.h>
46 #include <linux/net.h>
47 #include <linux/in6.h>
48 #include <linux/netdevice.h>
49 #include <linux/if_addr.h>
50 #include <linux/if_arp.h>
51 #include <linux/if_arcnet.h>
52 #include <linux/if_infiniband.h>
53 #include <linux/route.h>
54 #include <linux/inetdevice.h>
55 #include <linux/init.h>
56 #include <linux/slab.h>
57 #ifdef CONFIG_SYSCTL
58 #include <linux/sysctl.h>
59 #endif
60 #include <linux/capability.h>
61 #include <linux/delay.h>
62 #include <linux/notifier.h>
63 #include <linux/string.h>
64
65 #include <net/net_namespace.h>
66 #include <net/sock.h>
67 #include <net/snmp.h>
68
69 #include <net/ipv6.h>
70 #include <net/protocol.h>
71 #include <net/ndisc.h>
72 #include <net/ip6_route.h>
73 #include <net/addrconf.h>
74 #include <net/tcp.h>
75 #include <net/ip.h>
76 #include <net/netlink.h>
77 #include <net/pkt_sched.h>
78 #include <linux/if_tunnel.h>
79 #include <linux/rtnetlink.h>
80
81 #ifdef CONFIG_IPV6_PRIVACY
82 #include <linux/random.h>
83 #endif
84
85 #include <linux/uaccess.h>
86 #include <asm/unaligned.h>
87
88 #include <linux/proc_fs.h>
89 #include <linux/seq_file.h>
90
91 /* Set to 3 to get tracing... */
92 #define ACONF_DEBUG 2
93
94 #if ACONF_DEBUG >= 3
95 #define ADBG(x) printk x
96 #else
97 #define ADBG(x)
98 #endif
99
100 #define INFINITY_LIFE_TIME 0xFFFFFFFF
101
102 static inline u32 cstamp_delta(unsigned long cstamp)
103 {
104 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
105 }
106
107 #define ADDRCONF_TIMER_FUZZ_MINUS (HZ > 50 ? HZ/50 : 1)
108 #define ADDRCONF_TIMER_FUZZ (HZ / 4)
109 #define ADDRCONF_TIMER_FUZZ_MAX (HZ)
110
111 #ifdef CONFIG_SYSCTL
112 static void addrconf_sysctl_register(struct inet6_dev *idev);
113 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
114 #else
115 static inline void addrconf_sysctl_register(struct inet6_dev *idev)
116 {
117 }
118
119 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
120 {
121 }
122 #endif
123
124 #ifdef CONFIG_IPV6_PRIVACY
125 static int __ipv6_regen_rndid(struct inet6_dev *idev);
126 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
127 static void ipv6_regen_rndid(unsigned long data);
128 #endif
129
130 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
131 static int ipv6_count_addresses(struct inet6_dev *idev);
132
133 /*
134 * Configured unicast address hash table
135 */
136 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
137 static DEFINE_SPINLOCK(addrconf_hash_lock);
138
139 static void addrconf_verify(unsigned long);
140
141 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
142 static DEFINE_SPINLOCK(addrconf_verify_lock);
143
144 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
145 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
146
147 static void addrconf_type_change(struct net_device *dev,
148 unsigned long event);
149 static int addrconf_ifdown(struct net_device *dev, int how);
150
151 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
152 static void addrconf_dad_timer(unsigned long data);
153 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
154 static void addrconf_dad_run(struct inet6_dev *idev);
155 static void addrconf_rs_timer(unsigned long data);
156 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
157 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
158
159 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
160 struct prefix_info *pinfo);
161 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
162 struct net_device *dev);
163
164 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
165
166 static struct ipv6_devconf ipv6_devconf __read_mostly = {
167 .forwarding = 0,
168 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
169 .mtu6 = IPV6_MIN_MTU,
170 .accept_ra = 1,
171 .accept_redirects = 1,
172 .autoconf = 1,
173 .force_mld_version = 0,
174 .dad_transmits = 1,
175 .rtr_solicits = MAX_RTR_SOLICITATIONS,
176 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
177 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
178 #ifdef CONFIG_IPV6_PRIVACY
179 .use_tempaddr = 0,
180 .temp_valid_lft = TEMP_VALID_LIFETIME,
181 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
182 .regen_max_retry = REGEN_MAX_RETRY,
183 .max_desync_factor = MAX_DESYNC_FACTOR,
184 #endif
185 .max_addresses = IPV6_MAX_ADDRESSES,
186 .accept_ra_defrtr = 1,
187 .accept_ra_pinfo = 1,
188 #ifdef CONFIG_IPV6_ROUTER_PREF
189 .accept_ra_rtr_pref = 1,
190 .rtr_probe_interval = 60 * HZ,
191 #ifdef CONFIG_IPV6_ROUTE_INFO
192 .accept_ra_rt_info_max_plen = 0,
193 #endif
194 #endif
195 .proxy_ndp = 0,
196 .accept_source_route = 0, /* we do not accept RH0 by default. */
197 .disable_ipv6 = 0,
198 .accept_dad = 1,
199 };
200
201 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
202 .forwarding = 0,
203 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
204 .mtu6 = IPV6_MIN_MTU,
205 .accept_ra = 1,
206 .accept_redirects = 1,
207 .autoconf = 1,
208 .dad_transmits = 1,
209 .rtr_solicits = MAX_RTR_SOLICITATIONS,
210 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
211 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
212 #ifdef CONFIG_IPV6_PRIVACY
213 .use_tempaddr = 0,
214 .temp_valid_lft = TEMP_VALID_LIFETIME,
215 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
216 .regen_max_retry = REGEN_MAX_RETRY,
217 .max_desync_factor = MAX_DESYNC_FACTOR,
218 #endif
219 .max_addresses = IPV6_MAX_ADDRESSES,
220 .accept_ra_defrtr = 1,
221 .accept_ra_pinfo = 1,
222 #ifdef CONFIG_IPV6_ROUTER_PREF
223 .accept_ra_rtr_pref = 1,
224 .rtr_probe_interval = 60 * HZ,
225 #ifdef CONFIG_IPV6_ROUTE_INFO
226 .accept_ra_rt_info_max_plen = 0,
227 #endif
228 #endif
229 .proxy_ndp = 0,
230 .accept_source_route = 0, /* we do not accept RH0 by default. */
231 .disable_ipv6 = 0,
232 .accept_dad = 1,
233 };
234
235 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
236 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
237 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
238 const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
239 const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
240
241 /* Check if a valid qdisc is available */
242 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
243 {
244 return !qdisc_tx_is_noop(dev);
245 }
246
247 /* Check if a route is valid prefix route */
248 static inline int addrconf_is_prefix_route(const struct rt6_info *rt)
249 {
250 return (rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0;
251 }
252
253 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
254 {
255 if (del_timer(&ifp->timer))
256 __in6_ifa_put(ifp);
257 }
258
259 enum addrconf_timer_t {
260 AC_NONE,
261 AC_DAD,
262 AC_RS,
263 };
264
265 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
266 enum addrconf_timer_t what,
267 unsigned long when)
268 {
269 if (!del_timer(&ifp->timer))
270 in6_ifa_hold(ifp);
271
272 switch (what) {
273 case AC_DAD:
274 ifp->timer.function = addrconf_dad_timer;
275 break;
276 case AC_RS:
277 ifp->timer.function = addrconf_rs_timer;
278 break;
279 default:
280 break;
281 }
282 ifp->timer.expires = jiffies + when;
283 add_timer(&ifp->timer);
284 }
285
286 static int snmp6_alloc_dev(struct inet6_dev *idev)
287 {
288 if (snmp_mib_init((void __percpu **)idev->stats.ipv6,
289 sizeof(struct ipstats_mib),
290 __alignof__(struct ipstats_mib)) < 0)
291 goto err_ip;
292 if (snmp_mib_init((void __percpu **)idev->stats.icmpv6,
293 sizeof(struct icmpv6_mib),
294 __alignof__(struct icmpv6_mib)) < 0)
295 goto err_icmp;
296 if (snmp_mib_init((void __percpu **)idev->stats.icmpv6msg,
297 sizeof(struct icmpv6msg_mib),
298 __alignof__(struct icmpv6msg_mib)) < 0)
299 goto err_icmpmsg;
300
301 return 0;
302
303 err_icmpmsg:
304 snmp_mib_free((void __percpu **)idev->stats.icmpv6);
305 err_icmp:
306 snmp_mib_free((void __percpu **)idev->stats.ipv6);
307 err_ip:
308 return -ENOMEM;
309 }
310
311 static void snmp6_free_dev(struct inet6_dev *idev)
312 {
313 snmp_mib_free((void __percpu **)idev->stats.icmpv6msg);
314 snmp_mib_free((void __percpu **)idev->stats.icmpv6);
315 snmp_mib_free((void __percpu **)idev->stats.ipv6);
316 }
317
318 /* Nobody refers to this device, we may destroy it. */
319
320 static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
321 {
322 struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
323 kfree(idev);
324 }
325
326 void in6_dev_finish_destroy(struct inet6_dev *idev)
327 {
328 struct net_device *dev = idev->dev;
329
330 WARN_ON(!list_empty(&idev->addr_list));
331 WARN_ON(idev->mc_list != NULL);
332
333 #ifdef NET_REFCNT_DEBUG
334 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
335 #endif
336 dev_put(dev);
337 if (!idev->dead) {
338 pr_warning("Freeing alive inet6 device %p\n", idev);
339 return;
340 }
341 snmp6_free_dev(idev);
342 call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
343 }
344
345 EXPORT_SYMBOL(in6_dev_finish_destroy);
346
347 static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
348 {
349 struct inet6_dev *ndev;
350
351 ASSERT_RTNL();
352
353 if (dev->mtu < IPV6_MIN_MTU)
354 return NULL;
355
356 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
357
358 if (ndev == NULL)
359 return NULL;
360
361 rwlock_init(&ndev->lock);
362 ndev->dev = dev;
363 INIT_LIST_HEAD(&ndev->addr_list);
364
365 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
366 ndev->cnf.mtu6 = dev->mtu;
367 ndev->cnf.sysctl = NULL;
368 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
369 if (ndev->nd_parms == NULL) {
370 kfree(ndev);
371 return NULL;
372 }
373 if (ndev->cnf.forwarding)
374 dev_disable_lro(dev);
375 /* We refer to the device */
376 dev_hold(dev);
377
378 if (snmp6_alloc_dev(ndev) < 0) {
379 ADBG((KERN_WARNING
380 "%s(): cannot allocate memory for statistics; dev=%s.\n",
381 __func__, dev->name));
382 neigh_parms_release(&nd_tbl, ndev->nd_parms);
383 ndev->dead = 1;
384 in6_dev_finish_destroy(ndev);
385 return NULL;
386 }
387
388 if (snmp6_register_dev(ndev) < 0) {
389 ADBG((KERN_WARNING
390 "%s(): cannot create /proc/net/dev_snmp6/%s\n",
391 __func__, dev->name));
392 neigh_parms_release(&nd_tbl, ndev->nd_parms);
393 ndev->dead = 1;
394 in6_dev_finish_destroy(ndev);
395 return NULL;
396 }
397
398 /* One reference from device. We must do this before
399 * we invoke __ipv6_regen_rndid().
400 */
401 in6_dev_hold(ndev);
402
403 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
404 ndev->cnf.accept_dad = -1;
405
406 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
407 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
408 printk(KERN_INFO
409 "%s: Disabled Multicast RS\n",
410 dev->name);
411 ndev->cnf.rtr_solicits = 0;
412 }
413 #endif
414
415 #ifdef CONFIG_IPV6_PRIVACY
416 INIT_LIST_HEAD(&ndev->tempaddr_list);
417 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
418 if ((dev->flags&IFF_LOOPBACK) ||
419 dev->type == ARPHRD_TUNNEL ||
420 dev->type == ARPHRD_TUNNEL6 ||
421 dev->type == ARPHRD_SIT ||
422 dev->type == ARPHRD_NONE) {
423 ndev->cnf.use_tempaddr = -1;
424 } else {
425 in6_dev_hold(ndev);
426 ipv6_regen_rndid((unsigned long) ndev);
427 }
428 #endif
429
430 if (netif_running(dev) && addrconf_qdisc_ok(dev))
431 ndev->if_flags |= IF_READY;
432
433 ipv6_mc_init_dev(ndev);
434 ndev->tstamp = jiffies;
435 addrconf_sysctl_register(ndev);
436 /* protected by rtnl_lock */
437 rcu_assign_pointer(dev->ip6_ptr, ndev);
438
439 /* Join all-node multicast group */
440 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
441
442 return ndev;
443 }
444
445 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
446 {
447 struct inet6_dev *idev;
448
449 ASSERT_RTNL();
450
451 idev = __in6_dev_get(dev);
452 if (!idev) {
453 idev = ipv6_add_dev(dev);
454 if (!idev)
455 return NULL;
456 }
457
458 if (dev->flags&IFF_UP)
459 ipv6_mc_up(idev);
460 return idev;
461 }
462
463 #ifdef CONFIG_SYSCTL
464 static void dev_forward_change(struct inet6_dev *idev)
465 {
466 struct net_device *dev;
467 struct inet6_ifaddr *ifa;
468
469 if (!idev)
470 return;
471 dev = idev->dev;
472 if (idev->cnf.forwarding)
473 dev_disable_lro(dev);
474 if (dev && (dev->flags & IFF_MULTICAST)) {
475 if (idev->cnf.forwarding)
476 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
477 else
478 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
479 }
480
481 list_for_each_entry(ifa, &idev->addr_list, if_list) {
482 if (ifa->flags&IFA_F_TENTATIVE)
483 continue;
484 if (idev->cnf.forwarding)
485 addrconf_join_anycast(ifa);
486 else
487 addrconf_leave_anycast(ifa);
488 }
489 }
490
491
492 static void addrconf_forward_change(struct net *net, __s32 newf)
493 {
494 struct net_device *dev;
495 struct inet6_dev *idev;
496
497 rcu_read_lock();
498 for_each_netdev_rcu(net, dev) {
499 idev = __in6_dev_get(dev);
500 if (idev) {
501 int changed = (!idev->cnf.forwarding) ^ (!newf);
502 idev->cnf.forwarding = newf;
503 if (changed)
504 dev_forward_change(idev);
505 }
506 }
507 rcu_read_unlock();
508 }
509
510 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old)
511 {
512 struct net *net;
513
514 net = (struct net *)table->extra2;
515 if (p == &net->ipv6.devconf_dflt->forwarding)
516 return 0;
517
518 if (!rtnl_trylock()) {
519 /* Restore the original values before restarting */
520 *p = old;
521 return restart_syscall();
522 }
523
524 if (p == &net->ipv6.devconf_all->forwarding) {
525 __s32 newf = net->ipv6.devconf_all->forwarding;
526 net->ipv6.devconf_dflt->forwarding = newf;
527 addrconf_forward_change(net, newf);
528 } else if ((!*p) ^ (!old))
529 dev_forward_change((struct inet6_dev *)table->extra1);
530 rtnl_unlock();
531
532 if (*p)
533 rt6_purge_dflt_routers(net);
534 return 1;
535 }
536 #endif
537
538 static void inet6_ifa_finish_destroy_rcu(struct rcu_head *head)
539 {
540 struct inet6_ifaddr *ifp = container_of(head, struct inet6_ifaddr, rcu);
541 kfree(ifp);
542 }
543
544 /* Nobody refers to this ifaddr, destroy it */
545 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
546 {
547 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
548
549 #ifdef NET_REFCNT_DEBUG
550 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
551 #endif
552
553 in6_dev_put(ifp->idev);
554
555 if (del_timer(&ifp->timer))
556 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp);
557
558 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
559 pr_warning("Freeing alive inet6 address %p\n", ifp);
560 return;
561 }
562 dst_release(&ifp->rt->dst);
563
564 call_rcu(&ifp->rcu, inet6_ifa_finish_destroy_rcu);
565 }
566
567 static void
568 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
569 {
570 struct list_head *p;
571 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
572
573 /*
574 * Each device address list is sorted in order of scope -
575 * global before linklocal.
576 */
577 list_for_each(p, &idev->addr_list) {
578 struct inet6_ifaddr *ifa
579 = list_entry(p, struct inet6_ifaddr, if_list);
580 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
581 break;
582 }
583
584 list_add_tail(&ifp->if_list, p);
585 }
586
587 static u32 ipv6_addr_hash(const struct in6_addr *addr)
588 {
589 /*
590 * We perform the hash function over the last 64 bits of the address
591 * This will include the IEEE address token on links that support it.
592 */
593 return jhash_2words((__force u32)addr->s6_addr32[2],
594 (__force u32)addr->s6_addr32[3], 0)
595 & (IN6_ADDR_HSIZE - 1);
596 }
597
598 /* On success it returns ifp with increased reference count */
599
600 static struct inet6_ifaddr *
601 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
602 int scope, u32 flags)
603 {
604 struct inet6_ifaddr *ifa = NULL;
605 struct rt6_info *rt;
606 unsigned int hash;
607 int err = 0;
608 int addr_type = ipv6_addr_type(addr);
609
610 if (addr_type == IPV6_ADDR_ANY ||
611 addr_type & IPV6_ADDR_MULTICAST ||
612 (!(idev->dev->flags & IFF_LOOPBACK) &&
613 addr_type & IPV6_ADDR_LOOPBACK))
614 return ERR_PTR(-EADDRNOTAVAIL);
615
616 rcu_read_lock_bh();
617 if (idev->dead) {
618 err = -ENODEV; /*XXX*/
619 goto out2;
620 }
621
622 if (idev->cnf.disable_ipv6) {
623 err = -EACCES;
624 goto out2;
625 }
626
627 spin_lock(&addrconf_hash_lock);
628
629 /* Ignore adding duplicate addresses on an interface */
630 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
631 ADBG(("ipv6_add_addr: already assigned\n"));
632 err = -EEXIST;
633 goto out;
634 }
635
636 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
637
638 if (ifa == NULL) {
639 ADBG(("ipv6_add_addr: malloc failed\n"));
640 err = -ENOBUFS;
641 goto out;
642 }
643
644 rt = addrconf_dst_alloc(idev, addr, 0);
645 if (IS_ERR(rt)) {
646 err = PTR_ERR(rt);
647 goto out;
648 }
649
650 ipv6_addr_copy(&ifa->addr, addr);
651
652 spin_lock_init(&ifa->lock);
653 spin_lock_init(&ifa->state_lock);
654 init_timer(&ifa->timer);
655 INIT_HLIST_NODE(&ifa->addr_lst);
656 ifa->timer.data = (unsigned long) ifa;
657 ifa->scope = scope;
658 ifa->prefix_len = pfxlen;
659 ifa->flags = flags | IFA_F_TENTATIVE;
660 ifa->cstamp = ifa->tstamp = jiffies;
661
662 ifa->rt = rt;
663
664 /*
665 * part one of RFC 4429, section 3.3
666 * We should not configure an address as
667 * optimistic if we do not yet know the link
668 * layer address of our nexhop router
669 */
670
671 if (rt->rt6i_nexthop == NULL)
672 ifa->flags &= ~IFA_F_OPTIMISTIC;
673
674 ifa->idev = idev;
675 in6_dev_hold(idev);
676 /* For caller */
677 in6_ifa_hold(ifa);
678
679 /* Add to big hash table */
680 hash = ipv6_addr_hash(addr);
681
682 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
683 spin_unlock(&addrconf_hash_lock);
684
685 write_lock(&idev->lock);
686 /* Add to inet6_dev unicast addr list. */
687 ipv6_link_dev_addr(idev, ifa);
688
689 #ifdef CONFIG_IPV6_PRIVACY
690 if (ifa->flags&IFA_F_TEMPORARY) {
691 list_add(&ifa->tmp_list, &idev->tempaddr_list);
692 in6_ifa_hold(ifa);
693 }
694 #endif
695
696 in6_ifa_hold(ifa);
697 write_unlock(&idev->lock);
698 out2:
699 rcu_read_unlock_bh();
700
701 if (likely(err == 0))
702 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
703 else {
704 kfree(ifa);
705 ifa = ERR_PTR(err);
706 }
707
708 return ifa;
709 out:
710 spin_unlock(&addrconf_hash_lock);
711 goto out2;
712 }
713
714 /* This function wants to get referenced ifp and releases it before return */
715
716 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
717 {
718 struct inet6_ifaddr *ifa, *ifn;
719 struct inet6_dev *idev = ifp->idev;
720 int state;
721 int deleted = 0, onlink = 0;
722 unsigned long expires = jiffies;
723
724 spin_lock_bh(&ifp->state_lock);
725 state = ifp->state;
726 ifp->state = INET6_IFADDR_STATE_DEAD;
727 spin_unlock_bh(&ifp->state_lock);
728
729 if (state == INET6_IFADDR_STATE_DEAD)
730 goto out;
731
732 spin_lock_bh(&addrconf_hash_lock);
733 hlist_del_init_rcu(&ifp->addr_lst);
734 spin_unlock_bh(&addrconf_hash_lock);
735
736 write_lock_bh(&idev->lock);
737 #ifdef CONFIG_IPV6_PRIVACY
738 if (ifp->flags&IFA_F_TEMPORARY) {
739 list_del(&ifp->tmp_list);
740 if (ifp->ifpub) {
741 in6_ifa_put(ifp->ifpub);
742 ifp->ifpub = NULL;
743 }
744 __in6_ifa_put(ifp);
745 }
746 #endif
747
748 list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) {
749 if (ifa == ifp) {
750 list_del_init(&ifp->if_list);
751 __in6_ifa_put(ifp);
752
753 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
754 break;
755 deleted = 1;
756 continue;
757 } else if (ifp->flags & IFA_F_PERMANENT) {
758 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
759 ifp->prefix_len)) {
760 if (ifa->flags & IFA_F_PERMANENT) {
761 onlink = 1;
762 if (deleted)
763 break;
764 } else {
765 unsigned long lifetime;
766
767 if (!onlink)
768 onlink = -1;
769
770 spin_lock(&ifa->lock);
771
772 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
773 /*
774 * Note: Because this address is
775 * not permanent, lifetime <
776 * LONG_MAX / HZ here.
777 */
778 if (time_before(expires,
779 ifa->tstamp + lifetime * HZ))
780 expires = ifa->tstamp + lifetime * HZ;
781 spin_unlock(&ifa->lock);
782 }
783 }
784 }
785 }
786 write_unlock_bh(&idev->lock);
787
788 addrconf_del_timer(ifp);
789
790 ipv6_ifa_notify(RTM_DELADDR, ifp);
791
792 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
793
794 /*
795 * Purge or update corresponding prefix
796 *
797 * 1) we don't purge prefix here if address was not permanent.
798 * prefix is managed by its own lifetime.
799 * 2) if there're no addresses, delete prefix.
800 * 3) if there're still other permanent address(es),
801 * corresponding prefix is still permanent.
802 * 4) otherwise, update prefix lifetime to the
803 * longest valid lifetime among the corresponding
804 * addresses on the device.
805 * Note: subsequent RA will update lifetime.
806 *
807 * --yoshfuji
808 */
809 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
810 struct in6_addr prefix;
811 struct rt6_info *rt;
812 struct net *net = dev_net(ifp->idev->dev);
813 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
814 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1);
815
816 if (rt && addrconf_is_prefix_route(rt)) {
817 if (onlink == 0) {
818 ip6_del_rt(rt);
819 rt = NULL;
820 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
821 rt->rt6i_expires = expires;
822 rt->rt6i_flags |= RTF_EXPIRES;
823 }
824 }
825 dst_release(&rt->dst);
826 }
827
828 out:
829 in6_ifa_put(ifp);
830 }
831
832 #ifdef CONFIG_IPV6_PRIVACY
833 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
834 {
835 struct inet6_dev *idev = ifp->idev;
836 struct in6_addr addr, *tmpaddr;
837 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp, age;
838 unsigned long regen_advance;
839 int tmp_plen;
840 int ret = 0;
841 int max_addresses;
842 u32 addr_flags;
843
844 write_lock(&idev->lock);
845 if (ift) {
846 spin_lock_bh(&ift->lock);
847 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
848 spin_unlock_bh(&ift->lock);
849 tmpaddr = &addr;
850 } else {
851 tmpaddr = NULL;
852 }
853 retry:
854 in6_dev_hold(idev);
855 if (idev->cnf.use_tempaddr <= 0) {
856 write_unlock(&idev->lock);
857 printk(KERN_INFO
858 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
859 in6_dev_put(idev);
860 ret = -1;
861 goto out;
862 }
863 spin_lock_bh(&ifp->lock);
864 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
865 idev->cnf.use_tempaddr = -1; /*XXX*/
866 spin_unlock_bh(&ifp->lock);
867 write_unlock(&idev->lock);
868 printk(KERN_WARNING
869 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
870 in6_dev_put(idev);
871 ret = -1;
872 goto out;
873 }
874 in6_ifa_hold(ifp);
875 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
876 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
877 spin_unlock_bh(&ifp->lock);
878 write_unlock(&idev->lock);
879 printk(KERN_WARNING
880 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
881 in6_ifa_put(ifp);
882 in6_dev_put(idev);
883 ret = -1;
884 goto out;
885 }
886 memcpy(&addr.s6_addr[8], idev->rndid, 8);
887 age = (jiffies - ifp->tstamp) / HZ;
888 tmp_valid_lft = min_t(__u32,
889 ifp->valid_lft,
890 idev->cnf.temp_valid_lft + age);
891 tmp_prefered_lft = min_t(__u32,
892 ifp->prefered_lft,
893 idev->cnf.temp_prefered_lft + age -
894 idev->cnf.max_desync_factor);
895 tmp_plen = ifp->prefix_len;
896 max_addresses = idev->cnf.max_addresses;
897 tmp_cstamp = ifp->cstamp;
898 tmp_tstamp = ifp->tstamp;
899 spin_unlock_bh(&ifp->lock);
900
901 regen_advance = idev->cnf.regen_max_retry *
902 idev->cnf.dad_transmits *
903 idev->nd_parms->retrans_time / HZ;
904 write_unlock(&idev->lock);
905
906 /* A temporary address is created only if this calculated Preferred
907 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
908 * an implementation must not create a temporary address with a zero
909 * Preferred Lifetime.
910 */
911 if (tmp_prefered_lft <= regen_advance) {
912 in6_ifa_put(ifp);
913 in6_dev_put(idev);
914 ret = -1;
915 goto out;
916 }
917
918 addr_flags = IFA_F_TEMPORARY;
919 /* set in addrconf_prefix_rcv() */
920 if (ifp->flags & IFA_F_OPTIMISTIC)
921 addr_flags |= IFA_F_OPTIMISTIC;
922
923 ift = !max_addresses ||
924 ipv6_count_addresses(idev) < max_addresses ?
925 ipv6_add_addr(idev, &addr, tmp_plen,
926 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
927 addr_flags) : NULL;
928 if (!ift || IS_ERR(ift)) {
929 in6_ifa_put(ifp);
930 in6_dev_put(idev);
931 printk(KERN_INFO
932 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
933 tmpaddr = &addr;
934 write_lock(&idev->lock);
935 goto retry;
936 }
937
938 spin_lock_bh(&ift->lock);
939 ift->ifpub = ifp;
940 ift->valid_lft = tmp_valid_lft;
941 ift->prefered_lft = tmp_prefered_lft;
942 ift->cstamp = tmp_cstamp;
943 ift->tstamp = tmp_tstamp;
944 spin_unlock_bh(&ift->lock);
945
946 addrconf_dad_start(ift, 0);
947 in6_ifa_put(ift);
948 in6_dev_put(idev);
949 out:
950 return ret;
951 }
952 #endif
953
954 /*
955 * Choose an appropriate source address (RFC3484)
956 */
957 enum {
958 IPV6_SADDR_RULE_INIT = 0,
959 IPV6_SADDR_RULE_LOCAL,
960 IPV6_SADDR_RULE_SCOPE,
961 IPV6_SADDR_RULE_PREFERRED,
962 #ifdef CONFIG_IPV6_MIP6
963 IPV6_SADDR_RULE_HOA,
964 #endif
965 IPV6_SADDR_RULE_OIF,
966 IPV6_SADDR_RULE_LABEL,
967 #ifdef CONFIG_IPV6_PRIVACY
968 IPV6_SADDR_RULE_PRIVACY,
969 #endif
970 IPV6_SADDR_RULE_ORCHID,
971 IPV6_SADDR_RULE_PREFIX,
972 IPV6_SADDR_RULE_MAX
973 };
974
975 struct ipv6_saddr_score {
976 int rule;
977 int addr_type;
978 struct inet6_ifaddr *ifa;
979 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
980 int scopedist;
981 int matchlen;
982 };
983
984 struct ipv6_saddr_dst {
985 const struct in6_addr *addr;
986 int ifindex;
987 int scope;
988 int label;
989 unsigned int prefs;
990 };
991
992 static inline int ipv6_saddr_preferred(int type)
993 {
994 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
995 return 1;
996 return 0;
997 }
998
999 static int ipv6_get_saddr_eval(struct net *net,
1000 struct ipv6_saddr_score *score,
1001 struct ipv6_saddr_dst *dst,
1002 int i)
1003 {
1004 int ret;
1005
1006 if (i <= score->rule) {
1007 switch (i) {
1008 case IPV6_SADDR_RULE_SCOPE:
1009 ret = score->scopedist;
1010 break;
1011 case IPV6_SADDR_RULE_PREFIX:
1012 ret = score->matchlen;
1013 break;
1014 default:
1015 ret = !!test_bit(i, score->scorebits);
1016 }
1017 goto out;
1018 }
1019
1020 switch (i) {
1021 case IPV6_SADDR_RULE_INIT:
1022 /* Rule 0: remember if hiscore is not ready yet */
1023 ret = !!score->ifa;
1024 break;
1025 case IPV6_SADDR_RULE_LOCAL:
1026 /* Rule 1: Prefer same address */
1027 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1028 break;
1029 case IPV6_SADDR_RULE_SCOPE:
1030 /* Rule 2: Prefer appropriate scope
1031 *
1032 * ret
1033 * ^
1034 * -1 | d 15
1035 * ---+--+-+---> scope
1036 * |
1037 * | d is scope of the destination.
1038 * B-d | \
1039 * | \ <- smaller scope is better if
1040 * B-15 | \ if scope is enough for destinaion.
1041 * | ret = B - scope (-1 <= scope >= d <= 15).
1042 * d-C-1 | /
1043 * |/ <- greater is better
1044 * -C / if scope is not enough for destination.
1045 * /| ret = scope - C (-1 <= d < scope <= 15).
1046 *
1047 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1048 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1049 * Assume B = 0 and we get C > 29.
1050 */
1051 ret = __ipv6_addr_src_scope(score->addr_type);
1052 if (ret >= dst->scope)
1053 ret = -ret;
1054 else
1055 ret -= 128; /* 30 is enough */
1056 score->scopedist = ret;
1057 break;
1058 case IPV6_SADDR_RULE_PREFERRED:
1059 /* Rule 3: Avoid deprecated and optimistic addresses */
1060 ret = ipv6_saddr_preferred(score->addr_type) ||
1061 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1062 break;
1063 #ifdef CONFIG_IPV6_MIP6
1064 case IPV6_SADDR_RULE_HOA:
1065 {
1066 /* Rule 4: Prefer home address */
1067 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1068 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1069 break;
1070 }
1071 #endif
1072 case IPV6_SADDR_RULE_OIF:
1073 /* Rule 5: Prefer outgoing interface */
1074 ret = (!dst->ifindex ||
1075 dst->ifindex == score->ifa->idev->dev->ifindex);
1076 break;
1077 case IPV6_SADDR_RULE_LABEL:
1078 /* Rule 6: Prefer matching label */
1079 ret = ipv6_addr_label(net,
1080 &score->ifa->addr, score->addr_type,
1081 score->ifa->idev->dev->ifindex) == dst->label;
1082 break;
1083 #ifdef CONFIG_IPV6_PRIVACY
1084 case IPV6_SADDR_RULE_PRIVACY:
1085 {
1086 /* Rule 7: Prefer public address
1087 * Note: prefer temporary address if use_tempaddr >= 2
1088 */
1089 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1090 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1091 score->ifa->idev->cnf.use_tempaddr >= 2;
1092 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1093 break;
1094 }
1095 #endif
1096 case IPV6_SADDR_RULE_ORCHID:
1097 /* Rule 8-: Prefer ORCHID vs ORCHID or
1098 * non-ORCHID vs non-ORCHID
1099 */
1100 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1101 ipv6_addr_orchid(dst->addr));
1102 break;
1103 case IPV6_SADDR_RULE_PREFIX:
1104 /* Rule 8: Use longest matching prefix */
1105 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr,
1106 dst->addr);
1107 break;
1108 default:
1109 ret = 0;
1110 }
1111
1112 if (ret)
1113 __set_bit(i, score->scorebits);
1114 score->rule = i;
1115 out:
1116 return ret;
1117 }
1118
1119 int ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev,
1120 const struct in6_addr *daddr, unsigned int prefs,
1121 struct in6_addr *saddr)
1122 {
1123 struct ipv6_saddr_score scores[2],
1124 *score = &scores[0], *hiscore = &scores[1];
1125 struct ipv6_saddr_dst dst;
1126 struct net_device *dev;
1127 int dst_type;
1128
1129 dst_type = __ipv6_addr_type(daddr);
1130 dst.addr = daddr;
1131 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1132 dst.scope = __ipv6_addr_src_scope(dst_type);
1133 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1134 dst.prefs = prefs;
1135
1136 hiscore->rule = -1;
1137 hiscore->ifa = NULL;
1138
1139 rcu_read_lock();
1140
1141 for_each_netdev_rcu(net, dev) {
1142 struct inet6_dev *idev;
1143
1144 /* Candidate Source Address (section 4)
1145 * - multicast and link-local destination address,
1146 * the set of candidate source address MUST only
1147 * include addresses assigned to interfaces
1148 * belonging to the same link as the outgoing
1149 * interface.
1150 * (- For site-local destination addresses, the
1151 * set of candidate source addresses MUST only
1152 * include addresses assigned to interfaces
1153 * belonging to the same site as the outgoing
1154 * interface.)
1155 */
1156 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1157 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1158 dst.ifindex && dev->ifindex != dst.ifindex)
1159 continue;
1160
1161 idev = __in6_dev_get(dev);
1162 if (!idev)
1163 continue;
1164
1165 read_lock_bh(&idev->lock);
1166 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1167 int i;
1168
1169 /*
1170 * - Tentative Address (RFC2462 section 5.4)
1171 * - A tentative address is not considered
1172 * "assigned to an interface" in the traditional
1173 * sense, unless it is also flagged as optimistic.
1174 * - Candidate Source Address (section 4)
1175 * - In any case, anycast addresses, multicast
1176 * addresses, and the unspecified address MUST
1177 * NOT be included in a candidate set.
1178 */
1179 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1180 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1181 continue;
1182
1183 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1184
1185 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1186 score->addr_type & IPV6_ADDR_MULTICAST)) {
1187 LIMIT_NETDEBUG(KERN_DEBUG
1188 "ADDRCONF: unspecified / multicast address "
1189 "assigned as unicast address on %s",
1190 dev->name);
1191 continue;
1192 }
1193
1194 score->rule = -1;
1195 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1196
1197 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1198 int minihiscore, miniscore;
1199
1200 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1201 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1202
1203 if (minihiscore > miniscore) {
1204 if (i == IPV6_SADDR_RULE_SCOPE &&
1205 score->scopedist > 0) {
1206 /*
1207 * special case:
1208 * each remaining entry
1209 * has too small (not enough)
1210 * scope, because ifa entries
1211 * are sorted by their scope
1212 * values.
1213 */
1214 goto try_nextdev;
1215 }
1216 break;
1217 } else if (minihiscore < miniscore) {
1218 if (hiscore->ifa)
1219 in6_ifa_put(hiscore->ifa);
1220
1221 in6_ifa_hold(score->ifa);
1222
1223 swap(hiscore, score);
1224
1225 /* restore our iterator */
1226 score->ifa = hiscore->ifa;
1227
1228 break;
1229 }
1230 }
1231 }
1232 try_nextdev:
1233 read_unlock_bh(&idev->lock);
1234 }
1235 rcu_read_unlock();
1236
1237 if (!hiscore->ifa)
1238 return -EADDRNOTAVAIL;
1239
1240 ipv6_addr_copy(saddr, &hiscore->ifa->addr);
1241 in6_ifa_put(hiscore->ifa);
1242 return 0;
1243 }
1244 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1245
1246 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1247 unsigned char banned_flags)
1248 {
1249 struct inet6_dev *idev;
1250 int err = -EADDRNOTAVAIL;
1251
1252 rcu_read_lock();
1253 idev = __in6_dev_get(dev);
1254 if (idev) {
1255 struct inet6_ifaddr *ifp;
1256
1257 read_lock_bh(&idev->lock);
1258 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1259 if (ifp->scope == IFA_LINK &&
1260 !(ifp->flags & banned_flags)) {
1261 ipv6_addr_copy(addr, &ifp->addr);
1262 err = 0;
1263 break;
1264 }
1265 }
1266 read_unlock_bh(&idev->lock);
1267 }
1268 rcu_read_unlock();
1269 return err;
1270 }
1271
1272 static int ipv6_count_addresses(struct inet6_dev *idev)
1273 {
1274 int cnt = 0;
1275 struct inet6_ifaddr *ifp;
1276
1277 read_lock_bh(&idev->lock);
1278 list_for_each_entry(ifp, &idev->addr_list, if_list)
1279 cnt++;
1280 read_unlock_bh(&idev->lock);
1281 return cnt;
1282 }
1283
1284 int ipv6_chk_addr(struct net *net, struct in6_addr *addr,
1285 struct net_device *dev, int strict)
1286 {
1287 struct inet6_ifaddr *ifp;
1288 struct hlist_node *node;
1289 unsigned int hash = ipv6_addr_hash(addr);
1290
1291 rcu_read_lock_bh();
1292 hlist_for_each_entry_rcu(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1293 if (!net_eq(dev_net(ifp->idev->dev), net))
1294 continue;
1295 if (ipv6_addr_equal(&ifp->addr, addr) &&
1296 !(ifp->flags&IFA_F_TENTATIVE) &&
1297 (dev == NULL || ifp->idev->dev == dev ||
1298 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1299 rcu_read_unlock_bh();
1300 return 1;
1301 }
1302 }
1303
1304 rcu_read_unlock_bh();
1305 return 0;
1306 }
1307 EXPORT_SYMBOL(ipv6_chk_addr);
1308
1309 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1310 struct net_device *dev)
1311 {
1312 unsigned int hash = ipv6_addr_hash(addr);
1313 struct inet6_ifaddr *ifp;
1314 struct hlist_node *node;
1315
1316 hlist_for_each_entry(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1317 if (!net_eq(dev_net(ifp->idev->dev), net))
1318 continue;
1319 if (ipv6_addr_equal(&ifp->addr, addr)) {
1320 if (dev == NULL || ifp->idev->dev == dev)
1321 return true;
1322 }
1323 }
1324 return false;
1325 }
1326
1327 int ipv6_chk_prefix(struct in6_addr *addr, struct net_device *dev)
1328 {
1329 struct inet6_dev *idev;
1330 struct inet6_ifaddr *ifa;
1331 int onlink;
1332
1333 onlink = 0;
1334 rcu_read_lock();
1335 idev = __in6_dev_get(dev);
1336 if (idev) {
1337 read_lock_bh(&idev->lock);
1338 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1339 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1340 ifa->prefix_len);
1341 if (onlink)
1342 break;
1343 }
1344 read_unlock_bh(&idev->lock);
1345 }
1346 rcu_read_unlock();
1347 return onlink;
1348 }
1349
1350 EXPORT_SYMBOL(ipv6_chk_prefix);
1351
1352 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1353 struct net_device *dev, int strict)
1354 {
1355 struct inet6_ifaddr *ifp, *result = NULL;
1356 unsigned int hash = ipv6_addr_hash(addr);
1357 struct hlist_node *node;
1358
1359 rcu_read_lock_bh();
1360 hlist_for_each_entry_rcu_bh(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1361 if (!net_eq(dev_net(ifp->idev->dev), net))
1362 continue;
1363 if (ipv6_addr_equal(&ifp->addr, addr)) {
1364 if (dev == NULL || ifp->idev->dev == dev ||
1365 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1366 result = ifp;
1367 in6_ifa_hold(ifp);
1368 break;
1369 }
1370 }
1371 }
1372 rcu_read_unlock_bh();
1373
1374 return result;
1375 }
1376
1377 /* Gets referenced address, destroys ifaddr */
1378
1379 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1380 {
1381 if (ifp->flags&IFA_F_PERMANENT) {
1382 spin_lock_bh(&ifp->lock);
1383 addrconf_del_timer(ifp);
1384 ifp->flags |= IFA_F_TENTATIVE;
1385 if (dad_failed)
1386 ifp->flags |= IFA_F_DADFAILED;
1387 spin_unlock_bh(&ifp->lock);
1388 if (dad_failed)
1389 ipv6_ifa_notify(0, ifp);
1390 in6_ifa_put(ifp);
1391 #ifdef CONFIG_IPV6_PRIVACY
1392 } else if (ifp->flags&IFA_F_TEMPORARY) {
1393 struct inet6_ifaddr *ifpub;
1394 spin_lock_bh(&ifp->lock);
1395 ifpub = ifp->ifpub;
1396 if (ifpub) {
1397 in6_ifa_hold(ifpub);
1398 spin_unlock_bh(&ifp->lock);
1399 ipv6_create_tempaddr(ifpub, ifp);
1400 in6_ifa_put(ifpub);
1401 } else {
1402 spin_unlock_bh(&ifp->lock);
1403 }
1404 ipv6_del_addr(ifp);
1405 #endif
1406 } else
1407 ipv6_del_addr(ifp);
1408 }
1409
1410 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1411 {
1412 int err = -ENOENT;
1413
1414 spin_lock(&ifp->state_lock);
1415 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1416 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1417 err = 0;
1418 }
1419 spin_unlock(&ifp->state_lock);
1420
1421 return err;
1422 }
1423
1424 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1425 {
1426 struct inet6_dev *idev = ifp->idev;
1427
1428 if (addrconf_dad_end(ifp)) {
1429 in6_ifa_put(ifp);
1430 return;
1431 }
1432
1433 if (net_ratelimit())
1434 printk(KERN_INFO "%s: IPv6 duplicate address %pI6c detected!\n",
1435 ifp->idev->dev->name, &ifp->addr);
1436
1437 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1438 struct in6_addr addr;
1439
1440 addr.s6_addr32[0] = htonl(0xfe800000);
1441 addr.s6_addr32[1] = 0;
1442
1443 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1444 ipv6_addr_equal(&ifp->addr, &addr)) {
1445 /* DAD failed for link-local based on MAC address */
1446 idev->cnf.disable_ipv6 = 1;
1447
1448 printk(KERN_INFO "%s: IPv6 being disabled!\n",
1449 ifp->idev->dev->name);
1450 }
1451 }
1452
1453 addrconf_dad_stop(ifp, 1);
1454 }
1455
1456 /* Join to solicited addr multicast group. */
1457
1458 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1459 {
1460 struct in6_addr maddr;
1461
1462 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1463 return;
1464
1465 addrconf_addr_solict_mult(addr, &maddr);
1466 ipv6_dev_mc_inc(dev, &maddr);
1467 }
1468
1469 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1470 {
1471 struct in6_addr maddr;
1472
1473 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1474 return;
1475
1476 addrconf_addr_solict_mult(addr, &maddr);
1477 __ipv6_dev_mc_dec(idev, &maddr);
1478 }
1479
1480 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1481 {
1482 struct in6_addr addr;
1483 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1484 if (ipv6_addr_any(&addr))
1485 return;
1486 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1487 }
1488
1489 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1490 {
1491 struct in6_addr addr;
1492 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1493 if (ipv6_addr_any(&addr))
1494 return;
1495 __ipv6_dev_ac_dec(ifp->idev, &addr);
1496 }
1497
1498 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1499 {
1500 if (dev->addr_len != ETH_ALEN)
1501 return -1;
1502 memcpy(eui, dev->dev_addr, 3);
1503 memcpy(eui + 5, dev->dev_addr + 3, 3);
1504
1505 /*
1506 * The zSeries OSA network cards can be shared among various
1507 * OS instances, but the OSA cards have only one MAC address.
1508 * This leads to duplicate address conflicts in conjunction
1509 * with IPv6 if more than one instance uses the same card.
1510 *
1511 * The driver for these cards can deliver a unique 16-bit
1512 * identifier for each instance sharing the same card. It is
1513 * placed instead of 0xFFFE in the interface identifier. The
1514 * "u" bit of the interface identifier is not inverted in this
1515 * case. Hence the resulting interface identifier has local
1516 * scope according to RFC2373.
1517 */
1518 if (dev->dev_id) {
1519 eui[3] = (dev->dev_id >> 8) & 0xFF;
1520 eui[4] = dev->dev_id & 0xFF;
1521 } else {
1522 eui[3] = 0xFF;
1523 eui[4] = 0xFE;
1524 eui[0] ^= 2;
1525 }
1526 return 0;
1527 }
1528
1529 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1530 {
1531 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1532 if (dev->addr_len != ARCNET_ALEN)
1533 return -1;
1534 memset(eui, 0, 7);
1535 eui[7] = *(u8*)dev->dev_addr;
1536 return 0;
1537 }
1538
1539 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1540 {
1541 if (dev->addr_len != INFINIBAND_ALEN)
1542 return -1;
1543 memcpy(eui, dev->dev_addr + 12, 8);
1544 eui[0] |= 2;
1545 return 0;
1546 }
1547
1548 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1549 {
1550 if (addr == 0)
1551 return -1;
1552 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1553 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1554 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1555 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1556 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1557 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1558 eui[1] = 0;
1559 eui[2] = 0x5E;
1560 eui[3] = 0xFE;
1561 memcpy(eui + 4, &addr, 4);
1562 return 0;
1563 }
1564
1565 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1566 {
1567 if (dev->priv_flags & IFF_ISATAP)
1568 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1569 return -1;
1570 }
1571
1572 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1573 {
1574 switch (dev->type) {
1575 case ARPHRD_ETHER:
1576 case ARPHRD_FDDI:
1577 case ARPHRD_IEEE802_TR:
1578 return addrconf_ifid_eui48(eui, dev);
1579 case ARPHRD_ARCNET:
1580 return addrconf_ifid_arcnet(eui, dev);
1581 case ARPHRD_INFINIBAND:
1582 return addrconf_ifid_infiniband(eui, dev);
1583 case ARPHRD_SIT:
1584 return addrconf_ifid_sit(eui, dev);
1585 }
1586 return -1;
1587 }
1588
1589 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1590 {
1591 int err = -1;
1592 struct inet6_ifaddr *ifp;
1593
1594 read_lock_bh(&idev->lock);
1595 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1596 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1597 memcpy(eui, ifp->addr.s6_addr+8, 8);
1598 err = 0;
1599 break;
1600 }
1601 }
1602 read_unlock_bh(&idev->lock);
1603 return err;
1604 }
1605
1606 #ifdef CONFIG_IPV6_PRIVACY
1607 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1608 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1609 {
1610 regen:
1611 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1612 idev->rndid[0] &= ~0x02;
1613
1614 /*
1615 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1616 * check if generated address is not inappropriate
1617 *
1618 * - Reserved subnet anycast (RFC 2526)
1619 * 11111101 11....11 1xxxxxxx
1620 * - ISATAP (RFC4214) 6.1
1621 * 00-00-5E-FE-xx-xx-xx-xx
1622 * - value 0
1623 * - XXX: already assigned to an address on the device
1624 */
1625 if (idev->rndid[0] == 0xfd &&
1626 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1627 (idev->rndid[7]&0x80))
1628 goto regen;
1629 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1630 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1631 goto regen;
1632 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1633 goto regen;
1634 }
1635
1636 return 0;
1637 }
1638
1639 static void ipv6_regen_rndid(unsigned long data)
1640 {
1641 struct inet6_dev *idev = (struct inet6_dev *) data;
1642 unsigned long expires;
1643
1644 rcu_read_lock_bh();
1645 write_lock_bh(&idev->lock);
1646
1647 if (idev->dead)
1648 goto out;
1649
1650 if (__ipv6_regen_rndid(idev) < 0)
1651 goto out;
1652
1653 expires = jiffies +
1654 idev->cnf.temp_prefered_lft * HZ -
1655 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time -
1656 idev->cnf.max_desync_factor * HZ;
1657 if (time_before(expires, jiffies)) {
1658 printk(KERN_WARNING
1659 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1660 idev->dev->name);
1661 goto out;
1662 }
1663
1664 if (!mod_timer(&idev->regen_timer, expires))
1665 in6_dev_hold(idev);
1666
1667 out:
1668 write_unlock_bh(&idev->lock);
1669 rcu_read_unlock_bh();
1670 in6_dev_put(idev);
1671 }
1672
1673 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1674 int ret = 0;
1675
1676 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1677 ret = __ipv6_regen_rndid(idev);
1678 return ret;
1679 }
1680 #endif
1681
1682 /*
1683 * Add prefix route.
1684 */
1685
1686 static void
1687 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1688 unsigned long expires, u32 flags)
1689 {
1690 struct fib6_config cfg = {
1691 .fc_table = RT6_TABLE_PREFIX,
1692 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1693 .fc_ifindex = dev->ifindex,
1694 .fc_expires = expires,
1695 .fc_dst_len = plen,
1696 .fc_flags = RTF_UP | flags,
1697 .fc_nlinfo.nl_net = dev_net(dev),
1698 .fc_protocol = RTPROT_KERNEL,
1699 };
1700
1701 ipv6_addr_copy(&cfg.fc_dst, pfx);
1702
1703 /* Prevent useless cloning on PtP SIT.
1704 This thing is done here expecting that the whole
1705 class of non-broadcast devices need not cloning.
1706 */
1707 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1708 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1709 cfg.fc_flags |= RTF_NONEXTHOP;
1710 #endif
1711
1712 ip6_route_add(&cfg);
1713 }
1714
1715 /* Create "default" multicast route to the interface */
1716
1717 static void addrconf_add_mroute(struct net_device *dev)
1718 {
1719 struct fib6_config cfg = {
1720 .fc_table = RT6_TABLE_LOCAL,
1721 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1722 .fc_ifindex = dev->ifindex,
1723 .fc_dst_len = 8,
1724 .fc_flags = RTF_UP,
1725 .fc_nlinfo.nl_net = dev_net(dev),
1726 };
1727
1728 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1729
1730 ip6_route_add(&cfg);
1731 }
1732
1733 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1734 static void sit_route_add(struct net_device *dev)
1735 {
1736 struct fib6_config cfg = {
1737 .fc_table = RT6_TABLE_MAIN,
1738 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1739 .fc_ifindex = dev->ifindex,
1740 .fc_dst_len = 96,
1741 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1742 .fc_nlinfo.nl_net = dev_net(dev),
1743 };
1744
1745 /* prefix length - 96 bits "::d.d.d.d" */
1746 ip6_route_add(&cfg);
1747 }
1748 #endif
1749
1750 static void addrconf_add_lroute(struct net_device *dev)
1751 {
1752 struct in6_addr addr;
1753
1754 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1755 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1756 }
1757
1758 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1759 {
1760 struct inet6_dev *idev;
1761
1762 ASSERT_RTNL();
1763
1764 idev = ipv6_find_idev(dev);
1765 if (!idev)
1766 return ERR_PTR(-ENOBUFS);
1767
1768 if (idev->cnf.disable_ipv6)
1769 return ERR_PTR(-EACCES);
1770
1771 /* Add default multicast route */
1772 addrconf_add_mroute(dev);
1773
1774 /* Add link local route */
1775 addrconf_add_lroute(dev);
1776 return idev;
1777 }
1778
1779 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1780 {
1781 struct prefix_info *pinfo;
1782 __u32 valid_lft;
1783 __u32 prefered_lft;
1784 int addr_type;
1785 struct inet6_dev *in6_dev;
1786 struct net *net = dev_net(dev);
1787
1788 pinfo = (struct prefix_info *) opt;
1789
1790 if (len < sizeof(struct prefix_info)) {
1791 ADBG(("addrconf: prefix option too short\n"));
1792 return;
1793 }
1794
1795 /*
1796 * Validation checks ([ADDRCONF], page 19)
1797 */
1798
1799 addr_type = ipv6_addr_type(&pinfo->prefix);
1800
1801 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1802 return;
1803
1804 valid_lft = ntohl(pinfo->valid);
1805 prefered_lft = ntohl(pinfo->prefered);
1806
1807 if (prefered_lft > valid_lft) {
1808 if (net_ratelimit())
1809 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1810 return;
1811 }
1812
1813 in6_dev = in6_dev_get(dev);
1814
1815 if (in6_dev == NULL) {
1816 if (net_ratelimit())
1817 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1818 return;
1819 }
1820
1821 /*
1822 * Two things going on here:
1823 * 1) Add routes for on-link prefixes
1824 * 2) Configure prefixes with the auto flag set
1825 */
1826
1827 if (pinfo->onlink) {
1828 struct rt6_info *rt;
1829 unsigned long rt_expires;
1830
1831 /* Avoid arithmetic overflow. Really, we could
1832 * save rt_expires in seconds, likely valid_lft,
1833 * but it would require division in fib gc, that it
1834 * not good.
1835 */
1836 if (HZ > USER_HZ)
1837 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
1838 else
1839 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
1840
1841 if (addrconf_finite_timeout(rt_expires))
1842 rt_expires *= HZ;
1843
1844 rt = rt6_lookup(net, &pinfo->prefix, NULL,
1845 dev->ifindex, 1);
1846
1847 if (rt && addrconf_is_prefix_route(rt)) {
1848 /* Autoconf prefix route */
1849 if (valid_lft == 0) {
1850 ip6_del_rt(rt);
1851 rt = NULL;
1852 } else if (addrconf_finite_timeout(rt_expires)) {
1853 /* not infinity */
1854 rt->rt6i_expires = jiffies + rt_expires;
1855 rt->rt6i_flags |= RTF_EXPIRES;
1856 } else {
1857 rt->rt6i_flags &= ~RTF_EXPIRES;
1858 rt->rt6i_expires = 0;
1859 }
1860 } else if (valid_lft) {
1861 clock_t expires = 0;
1862 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
1863 if (addrconf_finite_timeout(rt_expires)) {
1864 /* not infinity */
1865 flags |= RTF_EXPIRES;
1866 expires = jiffies_to_clock_t(rt_expires);
1867 }
1868 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1869 dev, expires, flags);
1870 }
1871 if (rt)
1872 dst_release(&rt->dst);
1873 }
1874
1875 /* Try to figure out our local address for this prefix */
1876
1877 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1878 struct inet6_ifaddr * ifp;
1879 struct in6_addr addr;
1880 int create = 0, update_lft = 0;
1881
1882 if (pinfo->prefix_len == 64) {
1883 memcpy(&addr, &pinfo->prefix, 8);
1884 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1885 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1886 in6_dev_put(in6_dev);
1887 return;
1888 }
1889 goto ok;
1890 }
1891 if (net_ratelimit())
1892 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1893 pinfo->prefix_len);
1894 in6_dev_put(in6_dev);
1895 return;
1896
1897 ok:
1898
1899 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1900
1901 if (ifp == NULL && valid_lft) {
1902 int max_addresses = in6_dev->cnf.max_addresses;
1903 u32 addr_flags = 0;
1904
1905 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1906 if (in6_dev->cnf.optimistic_dad &&
1907 !net->ipv6.devconf_all->forwarding)
1908 addr_flags = IFA_F_OPTIMISTIC;
1909 #endif
1910
1911 /* Do not allow to create too much of autoconfigured
1912 * addresses; this would be too easy way to crash kernel.
1913 */
1914 if (!max_addresses ||
1915 ipv6_count_addresses(in6_dev) < max_addresses)
1916 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1917 addr_type&IPV6_ADDR_SCOPE_MASK,
1918 addr_flags);
1919
1920 if (!ifp || IS_ERR(ifp)) {
1921 in6_dev_put(in6_dev);
1922 return;
1923 }
1924
1925 update_lft = create = 1;
1926 ifp->cstamp = jiffies;
1927 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1928 }
1929
1930 if (ifp) {
1931 int flags;
1932 unsigned long now;
1933 #ifdef CONFIG_IPV6_PRIVACY
1934 struct inet6_ifaddr *ift;
1935 #endif
1936 u32 stored_lft;
1937
1938 /* update lifetime (RFC2462 5.5.3 e) */
1939 spin_lock(&ifp->lock);
1940 now = jiffies;
1941 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1942 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1943 else
1944 stored_lft = 0;
1945 if (!update_lft && stored_lft) {
1946 if (valid_lft > MIN_VALID_LIFETIME ||
1947 valid_lft > stored_lft)
1948 update_lft = 1;
1949 else if (stored_lft <= MIN_VALID_LIFETIME) {
1950 /* valid_lft <= stored_lft is always true */
1951 /*
1952 * RFC 4862 Section 5.5.3e:
1953 * "Note that the preferred lifetime of
1954 * the corresponding address is always
1955 * reset to the Preferred Lifetime in
1956 * the received Prefix Information
1957 * option, regardless of whether the
1958 * valid lifetime is also reset or
1959 * ignored."
1960 *
1961 * So if the preferred lifetime in
1962 * this advertisement is different
1963 * than what we have stored, but the
1964 * valid lifetime is invalid, just
1965 * reset prefered_lft.
1966 *
1967 * We must set the valid lifetime
1968 * to the stored lifetime since we'll
1969 * be updating the timestamp below,
1970 * else we'll set it back to the
1971 * minimum.
1972 */
1973 if (prefered_lft != ifp->prefered_lft) {
1974 valid_lft = stored_lft;
1975 update_lft = 1;
1976 }
1977 } else {
1978 valid_lft = MIN_VALID_LIFETIME;
1979 if (valid_lft < prefered_lft)
1980 prefered_lft = valid_lft;
1981 update_lft = 1;
1982 }
1983 }
1984
1985 if (update_lft) {
1986 ifp->valid_lft = valid_lft;
1987 ifp->prefered_lft = prefered_lft;
1988 ifp->tstamp = now;
1989 flags = ifp->flags;
1990 ifp->flags &= ~IFA_F_DEPRECATED;
1991 spin_unlock(&ifp->lock);
1992
1993 if (!(flags&IFA_F_TENTATIVE))
1994 ipv6_ifa_notify(0, ifp);
1995 } else
1996 spin_unlock(&ifp->lock);
1997
1998 #ifdef CONFIG_IPV6_PRIVACY
1999 read_lock_bh(&in6_dev->lock);
2000 /* update all temporary addresses in the list */
2001 list_for_each_entry(ift, &in6_dev->tempaddr_list, tmp_list) {
2002 /*
2003 * When adjusting the lifetimes of an existing
2004 * temporary address, only lower the lifetimes.
2005 * Implementations must not increase the
2006 * lifetimes of an existing temporary address
2007 * when processing a Prefix Information Option.
2008 */
2009 if (ifp != ift->ifpub)
2010 continue;
2011
2012 spin_lock(&ift->lock);
2013 flags = ift->flags;
2014 if (ift->valid_lft > valid_lft &&
2015 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
2016 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
2017 if (ift->prefered_lft > prefered_lft &&
2018 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
2019 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
2020 spin_unlock(&ift->lock);
2021 if (!(flags&IFA_F_TENTATIVE))
2022 ipv6_ifa_notify(0, ift);
2023 }
2024
2025 if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) {
2026 /*
2027 * When a new public address is created as described in [ADDRCONF],
2028 * also create a new temporary address. Also create a temporary
2029 * address if it's enabled but no temporary address currently exists.
2030 */
2031 read_unlock_bh(&in6_dev->lock);
2032 ipv6_create_tempaddr(ifp, NULL);
2033 } else {
2034 read_unlock_bh(&in6_dev->lock);
2035 }
2036 #endif
2037 in6_ifa_put(ifp);
2038 addrconf_verify(0);
2039 }
2040 }
2041 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2042 in6_dev_put(in6_dev);
2043 }
2044
2045 /*
2046 * Set destination address.
2047 * Special case for SIT interfaces where we create a new "virtual"
2048 * device.
2049 */
2050 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2051 {
2052 struct in6_ifreq ireq;
2053 struct net_device *dev;
2054 int err = -EINVAL;
2055
2056 rtnl_lock();
2057
2058 err = -EFAULT;
2059 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2060 goto err_exit;
2061
2062 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2063
2064 err = -ENODEV;
2065 if (dev == NULL)
2066 goto err_exit;
2067
2068 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2069 if (dev->type == ARPHRD_SIT) {
2070 const struct net_device_ops *ops = dev->netdev_ops;
2071 struct ifreq ifr;
2072 struct ip_tunnel_parm p;
2073
2074 err = -EADDRNOTAVAIL;
2075 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2076 goto err_exit;
2077
2078 memset(&p, 0, sizeof(p));
2079 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2080 p.iph.saddr = 0;
2081 p.iph.version = 4;
2082 p.iph.ihl = 5;
2083 p.iph.protocol = IPPROTO_IPV6;
2084 p.iph.ttl = 64;
2085 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2086
2087 if (ops->ndo_do_ioctl) {
2088 mm_segment_t oldfs = get_fs();
2089
2090 set_fs(KERNEL_DS);
2091 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2092 set_fs(oldfs);
2093 } else
2094 err = -EOPNOTSUPP;
2095
2096 if (err == 0) {
2097 err = -ENOBUFS;
2098 dev = __dev_get_by_name(net, p.name);
2099 if (!dev)
2100 goto err_exit;
2101 err = dev_open(dev);
2102 }
2103 }
2104 #endif
2105
2106 err_exit:
2107 rtnl_unlock();
2108 return err;
2109 }
2110
2111 /*
2112 * Manual configuration of address on an interface
2113 */
2114 static int inet6_addr_add(struct net *net, int ifindex, struct in6_addr *pfx,
2115 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
2116 __u32 valid_lft)
2117 {
2118 struct inet6_ifaddr *ifp;
2119 struct inet6_dev *idev;
2120 struct net_device *dev;
2121 int scope;
2122 u32 flags;
2123 clock_t expires;
2124 unsigned long timeout;
2125
2126 ASSERT_RTNL();
2127
2128 if (plen > 128)
2129 return -EINVAL;
2130
2131 /* check the lifetime */
2132 if (!valid_lft || prefered_lft > valid_lft)
2133 return -EINVAL;
2134
2135 dev = __dev_get_by_index(net, ifindex);
2136 if (!dev)
2137 return -ENODEV;
2138
2139 idev = addrconf_add_dev(dev);
2140 if (IS_ERR(idev))
2141 return PTR_ERR(idev);
2142
2143 scope = ipv6_addr_scope(pfx);
2144
2145 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2146 if (addrconf_finite_timeout(timeout)) {
2147 expires = jiffies_to_clock_t(timeout * HZ);
2148 valid_lft = timeout;
2149 flags = RTF_EXPIRES;
2150 } else {
2151 expires = 0;
2152 flags = 0;
2153 ifa_flags |= IFA_F_PERMANENT;
2154 }
2155
2156 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2157 if (addrconf_finite_timeout(timeout)) {
2158 if (timeout == 0)
2159 ifa_flags |= IFA_F_DEPRECATED;
2160 prefered_lft = timeout;
2161 }
2162
2163 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2164
2165 if (!IS_ERR(ifp)) {
2166 spin_lock_bh(&ifp->lock);
2167 ifp->valid_lft = valid_lft;
2168 ifp->prefered_lft = prefered_lft;
2169 ifp->tstamp = jiffies;
2170 spin_unlock_bh(&ifp->lock);
2171
2172 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2173 expires, flags);
2174 /*
2175 * Note that section 3.1 of RFC 4429 indicates
2176 * that the Optimistic flag should not be set for
2177 * manually configured addresses
2178 */
2179 addrconf_dad_start(ifp, 0);
2180 in6_ifa_put(ifp);
2181 addrconf_verify(0);
2182 return 0;
2183 }
2184
2185 return PTR_ERR(ifp);
2186 }
2187
2188 static int inet6_addr_del(struct net *net, int ifindex, struct in6_addr *pfx,
2189 unsigned int plen)
2190 {
2191 struct inet6_ifaddr *ifp;
2192 struct inet6_dev *idev;
2193 struct net_device *dev;
2194
2195 if (plen > 128)
2196 return -EINVAL;
2197
2198 dev = __dev_get_by_index(net, ifindex);
2199 if (!dev)
2200 return -ENODEV;
2201
2202 if ((idev = __in6_dev_get(dev)) == NULL)
2203 return -ENXIO;
2204
2205 read_lock_bh(&idev->lock);
2206 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2207 if (ifp->prefix_len == plen &&
2208 ipv6_addr_equal(pfx, &ifp->addr)) {
2209 in6_ifa_hold(ifp);
2210 read_unlock_bh(&idev->lock);
2211
2212 ipv6_del_addr(ifp);
2213
2214 /* If the last address is deleted administratively,
2215 disable IPv6 on this interface.
2216 */
2217 if (list_empty(&idev->addr_list))
2218 addrconf_ifdown(idev->dev, 1);
2219 return 0;
2220 }
2221 }
2222 read_unlock_bh(&idev->lock);
2223 return -EADDRNOTAVAIL;
2224 }
2225
2226
2227 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2228 {
2229 struct in6_ifreq ireq;
2230 int err;
2231
2232 if (!capable(CAP_NET_ADMIN))
2233 return -EPERM;
2234
2235 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2236 return -EFAULT;
2237
2238 rtnl_lock();
2239 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2240 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2241 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2242 rtnl_unlock();
2243 return err;
2244 }
2245
2246 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2247 {
2248 struct in6_ifreq ireq;
2249 int err;
2250
2251 if (!capable(CAP_NET_ADMIN))
2252 return -EPERM;
2253
2254 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2255 return -EFAULT;
2256
2257 rtnl_lock();
2258 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2259 ireq.ifr6_prefixlen);
2260 rtnl_unlock();
2261 return err;
2262 }
2263
2264 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2265 int plen, int scope)
2266 {
2267 struct inet6_ifaddr *ifp;
2268
2269 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT);
2270 if (!IS_ERR(ifp)) {
2271 spin_lock_bh(&ifp->lock);
2272 ifp->flags &= ~IFA_F_TENTATIVE;
2273 spin_unlock_bh(&ifp->lock);
2274 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2275 in6_ifa_put(ifp);
2276 }
2277 }
2278
2279 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2280 static void sit_add_v4_addrs(struct inet6_dev *idev)
2281 {
2282 struct in6_addr addr;
2283 struct net_device *dev;
2284 struct net *net = dev_net(idev->dev);
2285 int scope;
2286
2287 ASSERT_RTNL();
2288
2289 memset(&addr, 0, sizeof(struct in6_addr));
2290 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2291
2292 if (idev->dev->flags&IFF_POINTOPOINT) {
2293 addr.s6_addr32[0] = htonl(0xfe800000);
2294 scope = IFA_LINK;
2295 } else {
2296 scope = IPV6_ADDR_COMPATv4;
2297 }
2298
2299 if (addr.s6_addr32[3]) {
2300 add_addr(idev, &addr, 128, scope);
2301 return;
2302 }
2303
2304 for_each_netdev(net, dev) {
2305 struct in_device * in_dev = __in_dev_get_rtnl(dev);
2306 if (in_dev && (dev->flags & IFF_UP)) {
2307 struct in_ifaddr * ifa;
2308
2309 int flag = scope;
2310
2311 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2312 int plen;
2313
2314 addr.s6_addr32[3] = ifa->ifa_local;
2315
2316 if (ifa->ifa_scope == RT_SCOPE_LINK)
2317 continue;
2318 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2319 if (idev->dev->flags&IFF_POINTOPOINT)
2320 continue;
2321 flag |= IFA_HOST;
2322 }
2323 if (idev->dev->flags&IFF_POINTOPOINT)
2324 plen = 64;
2325 else
2326 plen = 96;
2327
2328 add_addr(idev, &addr, plen, flag);
2329 }
2330 }
2331 }
2332 }
2333 #endif
2334
2335 static void init_loopback(struct net_device *dev)
2336 {
2337 struct inet6_dev *idev;
2338
2339 /* ::1 */
2340
2341 ASSERT_RTNL();
2342
2343 if ((idev = ipv6_find_idev(dev)) == NULL) {
2344 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2345 return;
2346 }
2347
2348 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2349 }
2350
2351 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2352 {
2353 struct inet6_ifaddr * ifp;
2354 u32 addr_flags = IFA_F_PERMANENT;
2355
2356 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2357 if (idev->cnf.optimistic_dad &&
2358 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2359 addr_flags |= IFA_F_OPTIMISTIC;
2360 #endif
2361
2362
2363 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2364 if (!IS_ERR(ifp)) {
2365 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2366 addrconf_dad_start(ifp, 0);
2367 in6_ifa_put(ifp);
2368 }
2369 }
2370
2371 static void addrconf_dev_config(struct net_device *dev)
2372 {
2373 struct in6_addr addr;
2374 struct inet6_dev * idev;
2375
2376 ASSERT_RTNL();
2377
2378 if ((dev->type != ARPHRD_ETHER) &&
2379 (dev->type != ARPHRD_FDDI) &&
2380 (dev->type != ARPHRD_IEEE802_TR) &&
2381 (dev->type != ARPHRD_ARCNET) &&
2382 (dev->type != ARPHRD_INFINIBAND)) {
2383 /* Alas, we support only Ethernet autoconfiguration. */
2384 return;
2385 }
2386
2387 idev = addrconf_add_dev(dev);
2388 if (IS_ERR(idev))
2389 return;
2390
2391 memset(&addr, 0, sizeof(struct in6_addr));
2392 addr.s6_addr32[0] = htonl(0xFE800000);
2393
2394 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2395 addrconf_add_linklocal(idev, &addr);
2396 }
2397
2398 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2399 static void addrconf_sit_config(struct net_device *dev)
2400 {
2401 struct inet6_dev *idev;
2402
2403 ASSERT_RTNL();
2404
2405 /*
2406 * Configure the tunnel with one of our IPv4
2407 * addresses... we should configure all of
2408 * our v4 addrs in the tunnel
2409 */
2410
2411 if ((idev = ipv6_find_idev(dev)) == NULL) {
2412 printk(KERN_DEBUG "init sit: add_dev failed\n");
2413 return;
2414 }
2415
2416 if (dev->priv_flags & IFF_ISATAP) {
2417 struct in6_addr addr;
2418
2419 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2420 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2421 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2422 addrconf_add_linklocal(idev, &addr);
2423 return;
2424 }
2425
2426 sit_add_v4_addrs(idev);
2427
2428 if (dev->flags&IFF_POINTOPOINT) {
2429 addrconf_add_mroute(dev);
2430 addrconf_add_lroute(dev);
2431 } else
2432 sit_route_add(dev);
2433 }
2434 #endif
2435
2436 static inline int
2437 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2438 {
2439 struct in6_addr lladdr;
2440
2441 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2442 addrconf_add_linklocal(idev, &lladdr);
2443 return 0;
2444 }
2445 return -1;
2446 }
2447
2448 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2449 {
2450 struct net_device *link_dev;
2451 struct net *net = dev_net(idev->dev);
2452
2453 /* first try to inherit the link-local address from the link device */
2454 if (idev->dev->iflink &&
2455 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
2456 if (!ipv6_inherit_linklocal(idev, link_dev))
2457 return;
2458 }
2459 /* then try to inherit it from any device */
2460 for_each_netdev(net, link_dev) {
2461 if (!ipv6_inherit_linklocal(idev, link_dev))
2462 return;
2463 }
2464 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2465 }
2466
2467 /*
2468 * Autoconfigure tunnel with a link-local address so routing protocols,
2469 * DHCPv6, MLD etc. can be run over the virtual link
2470 */
2471
2472 static void addrconf_ip6_tnl_config(struct net_device *dev)
2473 {
2474 struct inet6_dev *idev;
2475
2476 ASSERT_RTNL();
2477
2478 idev = addrconf_add_dev(dev);
2479 if (IS_ERR(idev)) {
2480 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2481 return;
2482 }
2483 ip6_tnl_add_linklocal(idev);
2484 }
2485
2486 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2487 void * data)
2488 {
2489 struct net_device *dev = (struct net_device *) data;
2490 struct inet6_dev *idev = __in6_dev_get(dev);
2491 int run_pending = 0;
2492 int err;
2493
2494 switch (event) {
2495 case NETDEV_REGISTER:
2496 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2497 idev = ipv6_add_dev(dev);
2498 if (!idev)
2499 return notifier_from_errno(-ENOMEM);
2500 }
2501 break;
2502
2503 case NETDEV_UP:
2504 case NETDEV_CHANGE:
2505 if (dev->flags & IFF_SLAVE)
2506 break;
2507
2508 if (event == NETDEV_UP) {
2509 if (!addrconf_qdisc_ok(dev)) {
2510 /* device is not ready yet. */
2511 printk(KERN_INFO
2512 "ADDRCONF(NETDEV_UP): %s: "
2513 "link is not ready\n",
2514 dev->name);
2515 break;
2516 }
2517
2518 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2519 idev = ipv6_add_dev(dev);
2520
2521 if (idev) {
2522 idev->if_flags |= IF_READY;
2523 run_pending = 1;
2524 }
2525 } else {
2526 if (!addrconf_qdisc_ok(dev)) {
2527 /* device is still not ready. */
2528 break;
2529 }
2530
2531 if (idev) {
2532 if (idev->if_flags & IF_READY)
2533 /* device is already configured. */
2534 break;
2535 idev->if_flags |= IF_READY;
2536 }
2537
2538 printk(KERN_INFO
2539 "ADDRCONF(NETDEV_CHANGE): %s: "
2540 "link becomes ready\n",
2541 dev->name);
2542
2543 run_pending = 1;
2544 }
2545
2546 switch (dev->type) {
2547 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2548 case ARPHRD_SIT:
2549 addrconf_sit_config(dev);
2550 break;
2551 #endif
2552 case ARPHRD_TUNNEL6:
2553 addrconf_ip6_tnl_config(dev);
2554 break;
2555 case ARPHRD_LOOPBACK:
2556 init_loopback(dev);
2557 break;
2558
2559 default:
2560 addrconf_dev_config(dev);
2561 break;
2562 }
2563
2564 if (idev) {
2565 if (run_pending)
2566 addrconf_dad_run(idev);
2567
2568 /*
2569 * If the MTU changed during the interface down,
2570 * when the interface up, the changed MTU must be
2571 * reflected in the idev as well as routers.
2572 */
2573 if (idev->cnf.mtu6 != dev->mtu &&
2574 dev->mtu >= IPV6_MIN_MTU) {
2575 rt6_mtu_change(dev, dev->mtu);
2576 idev->cnf.mtu6 = dev->mtu;
2577 }
2578 idev->tstamp = jiffies;
2579 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2580
2581 /*
2582 * If the changed mtu during down is lower than
2583 * IPV6_MIN_MTU stop IPv6 on this interface.
2584 */
2585 if (dev->mtu < IPV6_MIN_MTU)
2586 addrconf_ifdown(dev, 1);
2587 }
2588 break;
2589
2590 case NETDEV_CHANGEMTU:
2591 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2592 rt6_mtu_change(dev, dev->mtu);
2593 idev->cnf.mtu6 = dev->mtu;
2594 break;
2595 }
2596
2597 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2598 idev = ipv6_add_dev(dev);
2599 if (idev)
2600 break;
2601 }
2602
2603 /*
2604 * MTU falled under IPV6_MIN_MTU.
2605 * Stop IPv6 on this interface.
2606 */
2607
2608 case NETDEV_DOWN:
2609 case NETDEV_UNREGISTER:
2610 /*
2611 * Remove all addresses from this interface.
2612 */
2613 addrconf_ifdown(dev, event != NETDEV_DOWN);
2614 break;
2615
2616 case NETDEV_CHANGENAME:
2617 if (idev) {
2618 snmp6_unregister_dev(idev);
2619 addrconf_sysctl_unregister(idev);
2620 addrconf_sysctl_register(idev);
2621 err = snmp6_register_dev(idev);
2622 if (err)
2623 return notifier_from_errno(err);
2624 }
2625 break;
2626
2627 case NETDEV_PRE_TYPE_CHANGE:
2628 case NETDEV_POST_TYPE_CHANGE:
2629 addrconf_type_change(dev, event);
2630 break;
2631 }
2632
2633 return NOTIFY_OK;
2634 }
2635
2636 /*
2637 * addrconf module should be notified of a device going up
2638 */
2639 static struct notifier_block ipv6_dev_notf = {
2640 .notifier_call = addrconf_notify,
2641 };
2642
2643 static void addrconf_type_change(struct net_device *dev, unsigned long event)
2644 {
2645 struct inet6_dev *idev;
2646 ASSERT_RTNL();
2647
2648 idev = __in6_dev_get(dev);
2649
2650 if (event == NETDEV_POST_TYPE_CHANGE)
2651 ipv6_mc_remap(idev);
2652 else if (event == NETDEV_PRE_TYPE_CHANGE)
2653 ipv6_mc_unmap(idev);
2654 }
2655
2656 static int addrconf_ifdown(struct net_device *dev, int how)
2657 {
2658 struct net *net = dev_net(dev);
2659 struct inet6_dev *idev;
2660 struct inet6_ifaddr *ifa;
2661 int state, i;
2662
2663 ASSERT_RTNL();
2664
2665 rt6_ifdown(net, dev);
2666 neigh_ifdown(&nd_tbl, dev);
2667
2668 idev = __in6_dev_get(dev);
2669 if (idev == NULL)
2670 return -ENODEV;
2671
2672 /*
2673 * Step 1: remove reference to ipv6 device from parent device.
2674 * Do not dev_put!
2675 */
2676 if (how) {
2677 idev->dead = 1;
2678
2679 /* protected by rtnl_lock */
2680 rcu_assign_pointer(dev->ip6_ptr, NULL);
2681
2682 /* Step 1.5: remove snmp6 entry */
2683 snmp6_unregister_dev(idev);
2684
2685 }
2686
2687 /* Step 2: clear hash table */
2688 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
2689 struct hlist_head *h = &inet6_addr_lst[i];
2690 struct hlist_node *n;
2691
2692 spin_lock_bh(&addrconf_hash_lock);
2693 restart:
2694 hlist_for_each_entry_rcu(ifa, n, h, addr_lst) {
2695 if (ifa->idev == idev) {
2696 hlist_del_init_rcu(&ifa->addr_lst);
2697 addrconf_del_timer(ifa);
2698 goto restart;
2699 }
2700 }
2701 spin_unlock_bh(&addrconf_hash_lock);
2702 }
2703
2704 write_lock_bh(&idev->lock);
2705
2706 /* Step 2: clear flags for stateless addrconf */
2707 if (!how)
2708 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2709
2710 #ifdef CONFIG_IPV6_PRIVACY
2711 if (how && del_timer(&idev->regen_timer))
2712 in6_dev_put(idev);
2713
2714 /* Step 3: clear tempaddr list */
2715 while (!list_empty(&idev->tempaddr_list)) {
2716 ifa = list_first_entry(&idev->tempaddr_list,
2717 struct inet6_ifaddr, tmp_list);
2718 list_del(&ifa->tmp_list);
2719 write_unlock_bh(&idev->lock);
2720 spin_lock_bh(&ifa->lock);
2721
2722 if (ifa->ifpub) {
2723 in6_ifa_put(ifa->ifpub);
2724 ifa->ifpub = NULL;
2725 }
2726 spin_unlock_bh(&ifa->lock);
2727 in6_ifa_put(ifa);
2728 write_lock_bh(&idev->lock);
2729 }
2730 #endif
2731
2732 while (!list_empty(&idev->addr_list)) {
2733 ifa = list_first_entry(&idev->addr_list,
2734 struct inet6_ifaddr, if_list);
2735 addrconf_del_timer(ifa);
2736
2737 list_del(&ifa->if_list);
2738
2739 write_unlock_bh(&idev->lock);
2740
2741 spin_lock_bh(&ifa->state_lock);
2742 state = ifa->state;
2743 ifa->state = INET6_IFADDR_STATE_DEAD;
2744 spin_unlock_bh(&ifa->state_lock);
2745
2746 if (state != INET6_IFADDR_STATE_DEAD) {
2747 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2748 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2749 }
2750 in6_ifa_put(ifa);
2751
2752 write_lock_bh(&idev->lock);
2753 }
2754
2755 write_unlock_bh(&idev->lock);
2756
2757 /* Step 5: Discard multicast list */
2758 if (how)
2759 ipv6_mc_destroy_dev(idev);
2760 else
2761 ipv6_mc_down(idev);
2762
2763 idev->tstamp = jiffies;
2764
2765 /* Last: Shot the device (if unregistered) */
2766 if (how) {
2767 addrconf_sysctl_unregister(idev);
2768 neigh_parms_release(&nd_tbl, idev->nd_parms);
2769 neigh_ifdown(&nd_tbl, dev);
2770 in6_dev_put(idev);
2771 }
2772 return 0;
2773 }
2774
2775 static void addrconf_rs_timer(unsigned long data)
2776 {
2777 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2778 struct inet6_dev *idev = ifp->idev;
2779
2780 read_lock(&idev->lock);
2781 if (idev->dead || !(idev->if_flags & IF_READY))
2782 goto out;
2783
2784 if (idev->cnf.forwarding)
2785 goto out;
2786
2787 /* Announcement received after solicitation was sent */
2788 if (idev->if_flags & IF_RA_RCVD)
2789 goto out;
2790
2791 spin_lock(&ifp->lock);
2792 if (ifp->probes++ < idev->cnf.rtr_solicits) {
2793 /* The wait after the last probe can be shorter */
2794 addrconf_mod_timer(ifp, AC_RS,
2795 (ifp->probes == idev->cnf.rtr_solicits) ?
2796 idev->cnf.rtr_solicit_delay :
2797 idev->cnf.rtr_solicit_interval);
2798 spin_unlock(&ifp->lock);
2799
2800 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2801 } else {
2802 spin_unlock(&ifp->lock);
2803 /*
2804 * Note: we do not support deprecated "all on-link"
2805 * assumption any longer.
2806 */
2807 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2808 idev->dev->name);
2809 }
2810
2811 out:
2812 read_unlock(&idev->lock);
2813 in6_ifa_put(ifp);
2814 }
2815
2816 /*
2817 * Duplicate Address Detection
2818 */
2819 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2820 {
2821 unsigned long rand_num;
2822 struct inet6_dev *idev = ifp->idev;
2823
2824 if (ifp->flags & IFA_F_OPTIMISTIC)
2825 rand_num = 0;
2826 else
2827 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2828
2829 ifp->probes = idev->cnf.dad_transmits;
2830 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2831 }
2832
2833 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2834 {
2835 struct inet6_dev *idev = ifp->idev;
2836 struct net_device *dev = idev->dev;
2837
2838 addrconf_join_solict(dev, &ifp->addr);
2839
2840 net_srandom(ifp->addr.s6_addr32[3]);
2841
2842 read_lock_bh(&idev->lock);
2843 spin_lock(&ifp->lock);
2844 if (ifp->state == INET6_IFADDR_STATE_DEAD)
2845 goto out;
2846
2847 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2848 idev->cnf.accept_dad < 1 ||
2849 !(ifp->flags&IFA_F_TENTATIVE) ||
2850 ifp->flags & IFA_F_NODAD) {
2851 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
2852 spin_unlock(&ifp->lock);
2853 read_unlock_bh(&idev->lock);
2854
2855 addrconf_dad_completed(ifp);
2856 return;
2857 }
2858
2859 if (!(idev->if_flags & IF_READY)) {
2860 spin_unlock(&ifp->lock);
2861 read_unlock_bh(&idev->lock);
2862 /*
2863 * If the device is not ready:
2864 * - keep it tentative if it is a permanent address.
2865 * - otherwise, kill it.
2866 */
2867 in6_ifa_hold(ifp);
2868 addrconf_dad_stop(ifp, 0);
2869 return;
2870 }
2871
2872 /*
2873 * Optimistic nodes can start receiving
2874 * Frames right away
2875 */
2876 if (ifp->flags & IFA_F_OPTIMISTIC)
2877 ip6_ins_rt(ifp->rt);
2878
2879 addrconf_dad_kick(ifp);
2880 out:
2881 spin_unlock(&ifp->lock);
2882 read_unlock_bh(&idev->lock);
2883 }
2884
2885 static void addrconf_dad_timer(unsigned long data)
2886 {
2887 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2888 struct inet6_dev *idev = ifp->idev;
2889 struct in6_addr mcaddr;
2890
2891 if (!ifp->probes && addrconf_dad_end(ifp))
2892 goto out;
2893
2894 read_lock(&idev->lock);
2895 if (idev->dead || !(idev->if_flags & IF_READY)) {
2896 read_unlock(&idev->lock);
2897 goto out;
2898 }
2899
2900 spin_lock(&ifp->lock);
2901 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
2902 spin_unlock(&ifp->lock);
2903 read_unlock(&idev->lock);
2904 goto out;
2905 }
2906
2907 if (ifp->probes == 0) {
2908 /*
2909 * DAD was successful
2910 */
2911
2912 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
2913 spin_unlock(&ifp->lock);
2914 read_unlock(&idev->lock);
2915
2916 addrconf_dad_completed(ifp);
2917
2918 goto out;
2919 }
2920
2921 ifp->probes--;
2922 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2923 spin_unlock(&ifp->lock);
2924 read_unlock(&idev->lock);
2925
2926 /* send a neighbour solicitation for our addr */
2927 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2928 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
2929 out:
2930 in6_ifa_put(ifp);
2931 }
2932
2933 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2934 {
2935 struct net_device *dev = ifp->idev->dev;
2936
2937 /*
2938 * Configure the address for reception. Now it is valid.
2939 */
2940
2941 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2942
2943 /* If added prefix is link local and forwarding is off,
2944 start sending router solicitations.
2945 */
2946
2947 if ((ifp->idev->cnf.forwarding == 0 ||
2948 ifp->idev->cnf.forwarding == 2) &&
2949 ifp->idev->cnf.rtr_solicits > 0 &&
2950 (dev->flags&IFF_LOOPBACK) == 0 &&
2951 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2952 /*
2953 * If a host as already performed a random delay
2954 * [...] as part of DAD [...] there is no need
2955 * to delay again before sending the first RS
2956 */
2957 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2958
2959 spin_lock_bh(&ifp->lock);
2960 ifp->probes = 1;
2961 ifp->idev->if_flags |= IF_RS_SENT;
2962 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2963 spin_unlock_bh(&ifp->lock);
2964 }
2965 }
2966
2967 static void addrconf_dad_run(struct inet6_dev *idev)
2968 {
2969 struct inet6_ifaddr *ifp;
2970
2971 read_lock_bh(&idev->lock);
2972 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2973 spin_lock(&ifp->lock);
2974 if (ifp->flags & IFA_F_TENTATIVE &&
2975 ifp->state == INET6_IFADDR_STATE_DAD)
2976 addrconf_dad_kick(ifp);
2977 spin_unlock(&ifp->lock);
2978 }
2979 read_unlock_bh(&idev->lock);
2980 }
2981
2982 #ifdef CONFIG_PROC_FS
2983 struct if6_iter_state {
2984 struct seq_net_private p;
2985 int bucket;
2986 };
2987
2988 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2989 {
2990 struct inet6_ifaddr *ifa = NULL;
2991 struct if6_iter_state *state = seq->private;
2992 struct net *net = seq_file_net(seq);
2993
2994 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2995 struct hlist_node *n;
2996 hlist_for_each_entry_rcu_bh(ifa, n, &inet6_addr_lst[state->bucket],
2997 addr_lst)
2998 if (net_eq(dev_net(ifa->idev->dev), net))
2999 return ifa;
3000 }
3001 return NULL;
3002 }
3003
3004 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3005 struct inet6_ifaddr *ifa)
3006 {
3007 struct if6_iter_state *state = seq->private;
3008 struct net *net = seq_file_net(seq);
3009 struct hlist_node *n = &ifa->addr_lst;
3010
3011 hlist_for_each_entry_continue_rcu_bh(ifa, n, addr_lst)
3012 if (net_eq(dev_net(ifa->idev->dev), net))
3013 return ifa;
3014
3015 while (++state->bucket < IN6_ADDR_HSIZE) {
3016 hlist_for_each_entry_rcu_bh(ifa, n,
3017 &inet6_addr_lst[state->bucket], addr_lst) {
3018 if (net_eq(dev_net(ifa->idev->dev), net))
3019 return ifa;
3020 }
3021 }
3022
3023 return NULL;
3024 }
3025
3026 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
3027 {
3028 struct inet6_ifaddr *ifa = if6_get_first(seq);
3029
3030 if (ifa)
3031 while (pos && (ifa = if6_get_next(seq, ifa)) != NULL)
3032 --pos;
3033 return pos ? NULL : ifa;
3034 }
3035
3036 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3037 __acquires(rcu_bh)
3038 {
3039 rcu_read_lock_bh();
3040 return if6_get_idx(seq, *pos);
3041 }
3042
3043 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3044 {
3045 struct inet6_ifaddr *ifa;
3046
3047 ifa = if6_get_next(seq, v);
3048 ++*pos;
3049 return ifa;
3050 }
3051
3052 static void if6_seq_stop(struct seq_file *seq, void *v)
3053 __releases(rcu_bh)
3054 {
3055 rcu_read_unlock_bh();
3056 }
3057
3058 static int if6_seq_show(struct seq_file *seq, void *v)
3059 {
3060 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3061 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3062 &ifp->addr,
3063 ifp->idev->dev->ifindex,
3064 ifp->prefix_len,
3065 ifp->scope,
3066 ifp->flags,
3067 ifp->idev->dev->name);
3068 return 0;
3069 }
3070
3071 static const struct seq_operations if6_seq_ops = {
3072 .start = if6_seq_start,
3073 .next = if6_seq_next,
3074 .show = if6_seq_show,
3075 .stop = if6_seq_stop,
3076 };
3077
3078 static int if6_seq_open(struct inode *inode, struct file *file)
3079 {
3080 return seq_open_net(inode, file, &if6_seq_ops,
3081 sizeof(struct if6_iter_state));
3082 }
3083
3084 static const struct file_operations if6_fops = {
3085 .owner = THIS_MODULE,
3086 .open = if6_seq_open,
3087 .read = seq_read,
3088 .llseek = seq_lseek,
3089 .release = seq_release_net,
3090 };
3091
3092 static int __net_init if6_proc_net_init(struct net *net)
3093 {
3094 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
3095 return -ENOMEM;
3096 return 0;
3097 }
3098
3099 static void __net_exit if6_proc_net_exit(struct net *net)
3100 {
3101 proc_net_remove(net, "if_inet6");
3102 }
3103
3104 static struct pernet_operations if6_proc_net_ops = {
3105 .init = if6_proc_net_init,
3106 .exit = if6_proc_net_exit,
3107 };
3108
3109 int __init if6_proc_init(void)
3110 {
3111 return register_pernet_subsys(&if6_proc_net_ops);
3112 }
3113
3114 void if6_proc_exit(void)
3115 {
3116 unregister_pernet_subsys(&if6_proc_net_ops);
3117 }
3118 #endif /* CONFIG_PROC_FS */
3119
3120 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3121 /* Check if address is a home address configured on any interface. */
3122 int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr)
3123 {
3124 int ret = 0;
3125 struct inet6_ifaddr *ifp = NULL;
3126 struct hlist_node *n;
3127 unsigned int hash = ipv6_addr_hash(addr);
3128
3129 rcu_read_lock_bh();
3130 hlist_for_each_entry_rcu_bh(ifp, n, &inet6_addr_lst[hash], addr_lst) {
3131 if (!net_eq(dev_net(ifp->idev->dev), net))
3132 continue;
3133 if (ipv6_addr_equal(&ifp->addr, addr) &&
3134 (ifp->flags & IFA_F_HOMEADDRESS)) {
3135 ret = 1;
3136 break;
3137 }
3138 }
3139 rcu_read_unlock_bh();
3140 return ret;
3141 }
3142 #endif
3143
3144 /*
3145 * Periodic address status verification
3146 */
3147
3148 static void addrconf_verify(unsigned long foo)
3149 {
3150 unsigned long now, next, next_sec, next_sched;
3151 struct inet6_ifaddr *ifp;
3152 struct hlist_node *node;
3153 int i;
3154
3155 rcu_read_lock_bh();
3156 spin_lock(&addrconf_verify_lock);
3157 now = jiffies;
3158 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3159
3160 del_timer(&addr_chk_timer);
3161
3162 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3163 restart:
3164 hlist_for_each_entry_rcu_bh(ifp, node,
3165 &inet6_addr_lst[i], addr_lst) {
3166 unsigned long age;
3167
3168 if (ifp->flags & IFA_F_PERMANENT)
3169 continue;
3170
3171 spin_lock(&ifp->lock);
3172 /* We try to batch several events at once. */
3173 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3174
3175 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3176 age >= ifp->valid_lft) {
3177 spin_unlock(&ifp->lock);
3178 in6_ifa_hold(ifp);
3179 ipv6_del_addr(ifp);
3180 goto restart;
3181 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3182 spin_unlock(&ifp->lock);
3183 continue;
3184 } else if (age >= ifp->prefered_lft) {
3185 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3186 int deprecate = 0;
3187
3188 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3189 deprecate = 1;
3190 ifp->flags |= IFA_F_DEPRECATED;
3191 }
3192
3193 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3194 next = ifp->tstamp + ifp->valid_lft * HZ;
3195
3196 spin_unlock(&ifp->lock);
3197
3198 if (deprecate) {
3199 in6_ifa_hold(ifp);
3200
3201 ipv6_ifa_notify(0, ifp);
3202 in6_ifa_put(ifp);
3203 goto restart;
3204 }
3205 #ifdef CONFIG_IPV6_PRIVACY
3206 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3207 !(ifp->flags&IFA_F_TENTATIVE)) {
3208 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3209 ifp->idev->cnf.dad_transmits *
3210 ifp->idev->nd_parms->retrans_time / HZ;
3211
3212 if (age >= ifp->prefered_lft - regen_advance) {
3213 struct inet6_ifaddr *ifpub = ifp->ifpub;
3214 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3215 next = ifp->tstamp + ifp->prefered_lft * HZ;
3216 if (!ifp->regen_count && ifpub) {
3217 ifp->regen_count++;
3218 in6_ifa_hold(ifp);
3219 in6_ifa_hold(ifpub);
3220 spin_unlock(&ifp->lock);
3221
3222 spin_lock(&ifpub->lock);
3223 ifpub->regen_count = 0;
3224 spin_unlock(&ifpub->lock);
3225 ipv6_create_tempaddr(ifpub, ifp);
3226 in6_ifa_put(ifpub);
3227 in6_ifa_put(ifp);
3228 goto restart;
3229 }
3230 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3231 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3232 spin_unlock(&ifp->lock);
3233 #endif
3234 } else {
3235 /* ifp->prefered_lft <= ifp->valid_lft */
3236 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3237 next = ifp->tstamp + ifp->prefered_lft * HZ;
3238 spin_unlock(&ifp->lock);
3239 }
3240 }
3241 }
3242
3243 next_sec = round_jiffies_up(next);
3244 next_sched = next;
3245
3246 /* If rounded timeout is accurate enough, accept it. */
3247 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3248 next_sched = next_sec;
3249
3250 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3251 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3252 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3253
3254 ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3255 now, next, next_sec, next_sched));
3256
3257 addr_chk_timer.expires = next_sched;
3258 add_timer(&addr_chk_timer);
3259 spin_unlock(&addrconf_verify_lock);
3260 rcu_read_unlock_bh();
3261 }
3262
3263 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3264 {
3265 struct in6_addr *pfx = NULL;
3266
3267 if (addr)
3268 pfx = nla_data(addr);
3269
3270 if (local) {
3271 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3272 pfx = NULL;
3273 else
3274 pfx = nla_data(local);
3275 }
3276
3277 return pfx;
3278 }
3279
3280 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3281 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3282 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3283 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3284 };
3285
3286 static int
3287 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3288 {
3289 struct net *net = sock_net(skb->sk);
3290 struct ifaddrmsg *ifm;
3291 struct nlattr *tb[IFA_MAX+1];
3292 struct in6_addr *pfx;
3293 int err;
3294
3295 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3296 if (err < 0)
3297 return err;
3298
3299 ifm = nlmsg_data(nlh);
3300 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3301 if (pfx == NULL)
3302 return -EINVAL;
3303
3304 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3305 }
3306
3307 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3308 u32 prefered_lft, u32 valid_lft)
3309 {
3310 u32 flags;
3311 clock_t expires;
3312 unsigned long timeout;
3313
3314 if (!valid_lft || (prefered_lft > valid_lft))
3315 return -EINVAL;
3316
3317 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3318 if (addrconf_finite_timeout(timeout)) {
3319 expires = jiffies_to_clock_t(timeout * HZ);
3320 valid_lft = timeout;
3321 flags = RTF_EXPIRES;
3322 } else {
3323 expires = 0;
3324 flags = 0;
3325 ifa_flags |= IFA_F_PERMANENT;
3326 }
3327
3328 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3329 if (addrconf_finite_timeout(timeout)) {
3330 if (timeout == 0)
3331 ifa_flags |= IFA_F_DEPRECATED;
3332 prefered_lft = timeout;
3333 }
3334
3335 spin_lock_bh(&ifp->lock);
3336 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3337 ifp->tstamp = jiffies;
3338 ifp->valid_lft = valid_lft;
3339 ifp->prefered_lft = prefered_lft;
3340
3341 spin_unlock_bh(&ifp->lock);
3342 if (!(ifp->flags&IFA_F_TENTATIVE))
3343 ipv6_ifa_notify(0, ifp);
3344
3345 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3346 expires, flags);
3347 addrconf_verify(0);
3348
3349 return 0;
3350 }
3351
3352 static int
3353 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3354 {
3355 struct net *net = sock_net(skb->sk);
3356 struct ifaddrmsg *ifm;
3357 struct nlattr *tb[IFA_MAX+1];
3358 struct in6_addr *pfx;
3359 struct inet6_ifaddr *ifa;
3360 struct net_device *dev;
3361 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3362 u8 ifa_flags;
3363 int err;
3364
3365 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3366 if (err < 0)
3367 return err;
3368
3369 ifm = nlmsg_data(nlh);
3370 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3371 if (pfx == NULL)
3372 return -EINVAL;
3373
3374 if (tb[IFA_CACHEINFO]) {
3375 struct ifa_cacheinfo *ci;
3376
3377 ci = nla_data(tb[IFA_CACHEINFO]);
3378 valid_lft = ci->ifa_valid;
3379 preferred_lft = ci->ifa_prefered;
3380 } else {
3381 preferred_lft = INFINITY_LIFE_TIME;
3382 valid_lft = INFINITY_LIFE_TIME;
3383 }
3384
3385 dev = __dev_get_by_index(net, ifm->ifa_index);
3386 if (dev == NULL)
3387 return -ENODEV;
3388
3389 /* We ignore other flags so far. */
3390 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3391
3392 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3393 if (ifa == NULL) {
3394 /*
3395 * It would be best to check for !NLM_F_CREATE here but
3396 * userspace alreay relies on not having to provide this.
3397 */
3398 return inet6_addr_add(net, ifm->ifa_index, pfx,
3399 ifm->ifa_prefixlen, ifa_flags,
3400 preferred_lft, valid_lft);
3401 }
3402
3403 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3404 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3405 err = -EEXIST;
3406 else
3407 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3408
3409 in6_ifa_put(ifa);
3410
3411 return err;
3412 }
3413
3414 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3415 u8 scope, int ifindex)
3416 {
3417 struct ifaddrmsg *ifm;
3418
3419 ifm = nlmsg_data(nlh);
3420 ifm->ifa_family = AF_INET6;
3421 ifm->ifa_prefixlen = prefixlen;
3422 ifm->ifa_flags = flags;
3423 ifm->ifa_scope = scope;
3424 ifm->ifa_index = ifindex;
3425 }
3426
3427 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3428 unsigned long tstamp, u32 preferred, u32 valid)
3429 {
3430 struct ifa_cacheinfo ci;
3431
3432 ci.cstamp = cstamp_delta(cstamp);
3433 ci.tstamp = cstamp_delta(tstamp);
3434 ci.ifa_prefered = preferred;
3435 ci.ifa_valid = valid;
3436
3437 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3438 }
3439
3440 static inline int rt_scope(int ifa_scope)
3441 {
3442 if (ifa_scope & IFA_HOST)
3443 return RT_SCOPE_HOST;
3444 else if (ifa_scope & IFA_LINK)
3445 return RT_SCOPE_LINK;
3446 else if (ifa_scope & IFA_SITE)
3447 return RT_SCOPE_SITE;
3448 else
3449 return RT_SCOPE_UNIVERSE;
3450 }
3451
3452 static inline int inet6_ifaddr_msgsize(void)
3453 {
3454 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3455 + nla_total_size(16) /* IFA_ADDRESS */
3456 + nla_total_size(sizeof(struct ifa_cacheinfo));
3457 }
3458
3459 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3460 u32 pid, u32 seq, int event, unsigned int flags)
3461 {
3462 struct nlmsghdr *nlh;
3463 u32 preferred, valid;
3464
3465 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3466 if (nlh == NULL)
3467 return -EMSGSIZE;
3468
3469 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3470 ifa->idev->dev->ifindex);
3471
3472 if (!(ifa->flags&IFA_F_PERMANENT)) {
3473 preferred = ifa->prefered_lft;
3474 valid = ifa->valid_lft;
3475 if (preferred != INFINITY_LIFE_TIME) {
3476 long tval = (jiffies - ifa->tstamp)/HZ;
3477 if (preferred > tval)
3478 preferred -= tval;
3479 else
3480 preferred = 0;
3481 if (valid != INFINITY_LIFE_TIME) {
3482 if (valid > tval)
3483 valid -= tval;
3484 else
3485 valid = 0;
3486 }
3487 }
3488 } else {
3489 preferred = INFINITY_LIFE_TIME;
3490 valid = INFINITY_LIFE_TIME;
3491 }
3492
3493 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3494 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3495 nlmsg_cancel(skb, nlh);
3496 return -EMSGSIZE;
3497 }
3498
3499 return nlmsg_end(skb, nlh);
3500 }
3501
3502 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3503 u32 pid, u32 seq, int event, u16 flags)
3504 {
3505 struct nlmsghdr *nlh;
3506 u8 scope = RT_SCOPE_UNIVERSE;
3507 int ifindex = ifmca->idev->dev->ifindex;
3508
3509 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3510 scope = RT_SCOPE_SITE;
3511
3512 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3513 if (nlh == NULL)
3514 return -EMSGSIZE;
3515
3516 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3517 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3518 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3519 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3520 nlmsg_cancel(skb, nlh);
3521 return -EMSGSIZE;
3522 }
3523
3524 return nlmsg_end(skb, nlh);
3525 }
3526
3527 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3528 u32 pid, u32 seq, int event, unsigned int flags)
3529 {
3530 struct nlmsghdr *nlh;
3531 u8 scope = RT_SCOPE_UNIVERSE;
3532 int ifindex = ifaca->aca_idev->dev->ifindex;
3533
3534 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3535 scope = RT_SCOPE_SITE;
3536
3537 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3538 if (nlh == NULL)
3539 return -EMSGSIZE;
3540
3541 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3542 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3543 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3544 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3545 nlmsg_cancel(skb, nlh);
3546 return -EMSGSIZE;
3547 }
3548
3549 return nlmsg_end(skb, nlh);
3550 }
3551
3552 enum addr_type_t {
3553 UNICAST_ADDR,
3554 MULTICAST_ADDR,
3555 ANYCAST_ADDR,
3556 };
3557
3558 /* called with rcu_read_lock() */
3559 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3560 struct netlink_callback *cb, enum addr_type_t type,
3561 int s_ip_idx, int *p_ip_idx)
3562 {
3563 struct ifmcaddr6 *ifmca;
3564 struct ifacaddr6 *ifaca;
3565 int err = 1;
3566 int ip_idx = *p_ip_idx;
3567
3568 read_lock_bh(&idev->lock);
3569 switch (type) {
3570 case UNICAST_ADDR: {
3571 struct inet6_ifaddr *ifa;
3572
3573 /* unicast address incl. temp addr */
3574 list_for_each_entry(ifa, &idev->addr_list, if_list) {
3575 if (++ip_idx < s_ip_idx)
3576 continue;
3577 err = inet6_fill_ifaddr(skb, ifa,
3578 NETLINK_CB(cb->skb).pid,
3579 cb->nlh->nlmsg_seq,
3580 RTM_NEWADDR,
3581 NLM_F_MULTI);
3582 if (err <= 0)
3583 break;
3584 }
3585 break;
3586 }
3587 case MULTICAST_ADDR:
3588 /* multicast address */
3589 for (ifmca = idev->mc_list; ifmca;
3590 ifmca = ifmca->next, ip_idx++) {
3591 if (ip_idx < s_ip_idx)
3592 continue;
3593 err = inet6_fill_ifmcaddr(skb, ifmca,
3594 NETLINK_CB(cb->skb).pid,
3595 cb->nlh->nlmsg_seq,
3596 RTM_GETMULTICAST,
3597 NLM_F_MULTI);
3598 if (err <= 0)
3599 break;
3600 }
3601 break;
3602 case ANYCAST_ADDR:
3603 /* anycast address */
3604 for (ifaca = idev->ac_list; ifaca;
3605 ifaca = ifaca->aca_next, ip_idx++) {
3606 if (ip_idx < s_ip_idx)
3607 continue;
3608 err = inet6_fill_ifacaddr(skb, ifaca,
3609 NETLINK_CB(cb->skb).pid,
3610 cb->nlh->nlmsg_seq,
3611 RTM_GETANYCAST,
3612 NLM_F_MULTI);
3613 if (err <= 0)
3614 break;
3615 }
3616 break;
3617 default:
3618 break;
3619 }
3620 read_unlock_bh(&idev->lock);
3621 *p_ip_idx = ip_idx;
3622 return err;
3623 }
3624
3625 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3626 enum addr_type_t type)
3627 {
3628 struct net *net = sock_net(skb->sk);
3629 int h, s_h;
3630 int idx, ip_idx;
3631 int s_idx, s_ip_idx;
3632 struct net_device *dev;
3633 struct inet6_dev *idev;
3634 struct hlist_head *head;
3635 struct hlist_node *node;
3636
3637 s_h = cb->args[0];
3638 s_idx = idx = cb->args[1];
3639 s_ip_idx = ip_idx = cb->args[2];
3640
3641 rcu_read_lock();
3642 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3643 idx = 0;
3644 head = &net->dev_index_head[h];
3645 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3646 if (idx < s_idx)
3647 goto cont;
3648 if (h > s_h || idx > s_idx)
3649 s_ip_idx = 0;
3650 ip_idx = 0;
3651 idev = __in6_dev_get(dev);
3652 if (!idev)
3653 goto cont;
3654
3655 if (in6_dump_addrs(idev, skb, cb, type,
3656 s_ip_idx, &ip_idx) <= 0)
3657 goto done;
3658 cont:
3659 idx++;
3660 }
3661 }
3662 done:
3663 rcu_read_unlock();
3664 cb->args[0] = h;
3665 cb->args[1] = idx;
3666 cb->args[2] = ip_idx;
3667
3668 return skb->len;
3669 }
3670
3671 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3672 {
3673 enum addr_type_t type = UNICAST_ADDR;
3674
3675 return inet6_dump_addr(skb, cb, type);
3676 }
3677
3678 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3679 {
3680 enum addr_type_t type = MULTICAST_ADDR;
3681
3682 return inet6_dump_addr(skb, cb, type);
3683 }
3684
3685
3686 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3687 {
3688 enum addr_type_t type = ANYCAST_ADDR;
3689
3690 return inet6_dump_addr(skb, cb, type);
3691 }
3692
3693 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3694 void *arg)
3695 {
3696 struct net *net = sock_net(in_skb->sk);
3697 struct ifaddrmsg *ifm;
3698 struct nlattr *tb[IFA_MAX+1];
3699 struct in6_addr *addr = NULL;
3700 struct net_device *dev = NULL;
3701 struct inet6_ifaddr *ifa;
3702 struct sk_buff *skb;
3703 int err;
3704
3705 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3706 if (err < 0)
3707 goto errout;
3708
3709 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3710 if (addr == NULL) {
3711 err = -EINVAL;
3712 goto errout;
3713 }
3714
3715 ifm = nlmsg_data(nlh);
3716 if (ifm->ifa_index)
3717 dev = __dev_get_by_index(net, ifm->ifa_index);
3718
3719 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
3720 if (!ifa) {
3721 err = -EADDRNOTAVAIL;
3722 goto errout;
3723 }
3724
3725 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
3726 if (!skb) {
3727 err = -ENOBUFS;
3728 goto errout_ifa;
3729 }
3730
3731 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3732 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3733 if (err < 0) {
3734 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3735 WARN_ON(err == -EMSGSIZE);
3736 kfree_skb(skb);
3737 goto errout_ifa;
3738 }
3739 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
3740 errout_ifa:
3741 in6_ifa_put(ifa);
3742 errout:
3743 return err;
3744 }
3745
3746 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3747 {
3748 struct sk_buff *skb;
3749 struct net *net = dev_net(ifa->idev->dev);
3750 int err = -ENOBUFS;
3751
3752 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3753 if (skb == NULL)
3754 goto errout;
3755
3756 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3757 if (err < 0) {
3758 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3759 WARN_ON(err == -EMSGSIZE);
3760 kfree_skb(skb);
3761 goto errout;
3762 }
3763 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3764 return;
3765 errout:
3766 if (err < 0)
3767 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3768 }
3769
3770 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3771 __s32 *array, int bytes)
3772 {
3773 BUG_ON(bytes < (DEVCONF_MAX * 4));
3774
3775 memset(array, 0, bytes);
3776 array[DEVCONF_FORWARDING] = cnf->forwarding;
3777 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3778 array[DEVCONF_MTU6] = cnf->mtu6;
3779 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3780 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3781 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3782 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3783 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3784 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
3785 jiffies_to_msecs(cnf->rtr_solicit_interval);
3786 array[DEVCONF_RTR_SOLICIT_DELAY] =
3787 jiffies_to_msecs(cnf->rtr_solicit_delay);
3788 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3789 #ifdef CONFIG_IPV6_PRIVACY
3790 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3791 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3792 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3793 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3794 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3795 #endif
3796 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3797 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3798 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3799 #ifdef CONFIG_IPV6_ROUTER_PREF
3800 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3801 array[DEVCONF_RTR_PROBE_INTERVAL] =
3802 jiffies_to_msecs(cnf->rtr_probe_interval);
3803 #ifdef CONFIG_IPV6_ROUTE_INFO
3804 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3805 #endif
3806 #endif
3807 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3808 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3809 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3810 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3811 #endif
3812 #ifdef CONFIG_IPV6_MROUTE
3813 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
3814 #endif
3815 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
3816 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
3817 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
3818 }
3819
3820 static inline size_t inet6_ifla6_size(void)
3821 {
3822 return nla_total_size(4) /* IFLA_INET6_FLAGS */
3823 + nla_total_size(sizeof(struct ifla_cacheinfo))
3824 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3825 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3826 + nla_total_size(ICMP6_MIB_MAX * 8); /* IFLA_INET6_ICMP6STATS */
3827 }
3828
3829 static inline size_t inet6_if_nlmsg_size(void)
3830 {
3831 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3832 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3833 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3834 + nla_total_size(4) /* IFLA_MTU */
3835 + nla_total_size(4) /* IFLA_LINK */
3836 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
3837 }
3838
3839 static inline void __snmp6_fill_stats(u64 *stats, void __percpu **mib,
3840 int items, int bytes)
3841 {
3842 int i;
3843 int pad = bytes - sizeof(u64) * items;
3844 BUG_ON(pad < 0);
3845
3846 /* Use put_unaligned() because stats may not be aligned for u64. */
3847 put_unaligned(items, &stats[0]);
3848 for (i = 1; i < items; i++)
3849 put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3850
3851 memset(&stats[items], 0, pad);
3852 }
3853
3854 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib,
3855 int items, int bytes, size_t syncpoff)
3856 {
3857 int i;
3858 int pad = bytes - sizeof(u64) * items;
3859 BUG_ON(pad < 0);
3860
3861 /* Use put_unaligned() because stats may not be aligned for u64. */
3862 put_unaligned(items, &stats[0]);
3863 for (i = 1; i < items; i++)
3864 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
3865
3866 memset(&stats[items], 0, pad);
3867 }
3868
3869 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3870 int bytes)
3871 {
3872 switch (attrtype) {
3873 case IFLA_INET6_STATS:
3874 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6,
3875 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
3876 break;
3877 case IFLA_INET6_ICMP6STATS:
3878 __snmp6_fill_stats(stats, (void __percpu **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
3879 break;
3880 }
3881 }
3882
3883 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
3884 {
3885 struct nlattr *nla;
3886 struct ifla_cacheinfo ci;
3887
3888 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
3889
3890 ci.max_reasm_len = IPV6_MAXPLEN;
3891 ci.tstamp = cstamp_delta(idev->tstamp);
3892 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
3893 ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time);
3894 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3895
3896 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3897 if (nla == NULL)
3898 goto nla_put_failure;
3899 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
3900
3901 /* XXX - MC not implemented */
3902
3903 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3904 if (nla == NULL)
3905 goto nla_put_failure;
3906 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3907
3908 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3909 if (nla == NULL)
3910 goto nla_put_failure;
3911 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
3912
3913 return 0;
3914
3915 nla_put_failure:
3916 return -EMSGSIZE;
3917 }
3918
3919 static size_t inet6_get_link_af_size(const struct net_device *dev)
3920 {
3921 if (!__in6_dev_get(dev))
3922 return 0;
3923
3924 return inet6_ifla6_size();
3925 }
3926
3927 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
3928 {
3929 struct inet6_dev *idev = __in6_dev_get(dev);
3930
3931 if (!idev)
3932 return -ENODATA;
3933
3934 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
3935 return -EMSGSIZE;
3936
3937 return 0;
3938 }
3939
3940 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3941 u32 pid, u32 seq, int event, unsigned int flags)
3942 {
3943 struct net_device *dev = idev->dev;
3944 struct ifinfomsg *hdr;
3945 struct nlmsghdr *nlh;
3946 void *protoinfo;
3947
3948 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3949 if (nlh == NULL)
3950 return -EMSGSIZE;
3951
3952 hdr = nlmsg_data(nlh);
3953 hdr->ifi_family = AF_INET6;
3954 hdr->__ifi_pad = 0;
3955 hdr->ifi_type = dev->type;
3956 hdr->ifi_index = dev->ifindex;
3957 hdr->ifi_flags = dev_get_flags(dev);
3958 hdr->ifi_change = 0;
3959
3960 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
3961
3962 if (dev->addr_len)
3963 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3964
3965 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
3966 if (dev->ifindex != dev->iflink)
3967 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
3968
3969 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3970 if (protoinfo == NULL)
3971 goto nla_put_failure;
3972
3973 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
3974 goto nla_put_failure;
3975
3976 nla_nest_end(skb, protoinfo);
3977 return nlmsg_end(skb, nlh);
3978
3979 nla_put_failure:
3980 nlmsg_cancel(skb, nlh);
3981 return -EMSGSIZE;
3982 }
3983
3984 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3985 {
3986 struct net *net = sock_net(skb->sk);
3987 int h, s_h;
3988 int idx = 0, s_idx;
3989 struct net_device *dev;
3990 struct inet6_dev *idev;
3991 struct hlist_head *head;
3992 struct hlist_node *node;
3993
3994 s_h = cb->args[0];
3995 s_idx = cb->args[1];
3996
3997 rcu_read_lock();
3998 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3999 idx = 0;
4000 head = &net->dev_index_head[h];
4001 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
4002 if (idx < s_idx)
4003 goto cont;
4004 idev = __in6_dev_get(dev);
4005 if (!idev)
4006 goto cont;
4007 if (inet6_fill_ifinfo(skb, idev,
4008 NETLINK_CB(cb->skb).pid,
4009 cb->nlh->nlmsg_seq,
4010 RTM_NEWLINK, NLM_F_MULTI) <= 0)
4011 goto out;
4012 cont:
4013 idx++;
4014 }
4015 }
4016 out:
4017 rcu_read_unlock();
4018 cb->args[1] = idx;
4019 cb->args[0] = h;
4020
4021 return skb->len;
4022 }
4023
4024 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4025 {
4026 struct sk_buff *skb;
4027 struct net *net = dev_net(idev->dev);
4028 int err = -ENOBUFS;
4029
4030 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
4031 if (skb == NULL)
4032 goto errout;
4033
4034 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
4035 if (err < 0) {
4036 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4037 WARN_ON(err == -EMSGSIZE);
4038 kfree_skb(skb);
4039 goto errout;
4040 }
4041 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
4042 return;
4043 errout:
4044 if (err < 0)
4045 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
4046 }
4047
4048 static inline size_t inet6_prefix_nlmsg_size(void)
4049 {
4050 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4051 + nla_total_size(sizeof(struct in6_addr))
4052 + nla_total_size(sizeof(struct prefix_cacheinfo));
4053 }
4054
4055 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
4056 struct prefix_info *pinfo, u32 pid, u32 seq,
4057 int event, unsigned int flags)
4058 {
4059 struct prefixmsg *pmsg;
4060 struct nlmsghdr *nlh;
4061 struct prefix_cacheinfo ci;
4062
4063 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
4064 if (nlh == NULL)
4065 return -EMSGSIZE;
4066
4067 pmsg = nlmsg_data(nlh);
4068 pmsg->prefix_family = AF_INET6;
4069 pmsg->prefix_pad1 = 0;
4070 pmsg->prefix_pad2 = 0;
4071 pmsg->prefix_ifindex = idev->dev->ifindex;
4072 pmsg->prefix_len = pinfo->prefix_len;
4073 pmsg->prefix_type = pinfo->type;
4074 pmsg->prefix_pad3 = 0;
4075 pmsg->prefix_flags = 0;
4076 if (pinfo->onlink)
4077 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4078 if (pinfo->autoconf)
4079 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4080
4081 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
4082
4083 ci.preferred_time = ntohl(pinfo->prefered);
4084 ci.valid_time = ntohl(pinfo->valid);
4085 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
4086
4087 return nlmsg_end(skb, nlh);
4088
4089 nla_put_failure:
4090 nlmsg_cancel(skb, nlh);
4091 return -EMSGSIZE;
4092 }
4093
4094 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
4095 struct prefix_info *pinfo)
4096 {
4097 struct sk_buff *skb;
4098 struct net *net = dev_net(idev->dev);
4099 int err = -ENOBUFS;
4100
4101 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
4102 if (skb == NULL)
4103 goto errout;
4104
4105 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
4106 if (err < 0) {
4107 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4108 WARN_ON(err == -EMSGSIZE);
4109 kfree_skb(skb);
4110 goto errout;
4111 }
4112 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4113 return;
4114 errout:
4115 if (err < 0)
4116 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
4117 }
4118
4119 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4120 {
4121 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4122
4123 switch (event) {
4124 case RTM_NEWADDR:
4125 /*
4126 * If the address was optimistic
4127 * we inserted the route at the start of
4128 * our DAD process, so we don't need
4129 * to do it again
4130 */
4131 if (!(ifp->rt->rt6i_node))
4132 ip6_ins_rt(ifp->rt);
4133 if (ifp->idev->cnf.forwarding)
4134 addrconf_join_anycast(ifp);
4135 break;
4136 case RTM_DELADDR:
4137 if (ifp->idev->cnf.forwarding)
4138 addrconf_leave_anycast(ifp);
4139 addrconf_leave_solict(ifp->idev, &ifp->addr);
4140 dst_hold(&ifp->rt->dst);
4141
4142 if (ip6_del_rt(ifp->rt))
4143 dst_free(&ifp->rt->dst);
4144 break;
4145 }
4146 }
4147
4148 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4149 {
4150 rcu_read_lock_bh();
4151 if (likely(ifp->idev->dead == 0))
4152 __ipv6_ifa_notify(event, ifp);
4153 rcu_read_unlock_bh();
4154 }
4155
4156 #ifdef CONFIG_SYSCTL
4157
4158 static
4159 int addrconf_sysctl_forward(ctl_table *ctl, int write,
4160 void __user *buffer, size_t *lenp, loff_t *ppos)
4161 {
4162 int *valp = ctl->data;
4163 int val = *valp;
4164 loff_t pos = *ppos;
4165 int ret;
4166
4167 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
4168
4169 if (write)
4170 ret = addrconf_fixup_forwarding(ctl, valp, val);
4171 if (ret)
4172 *ppos = pos;
4173 return ret;
4174 }
4175
4176 static void dev_disable_change(struct inet6_dev *idev)
4177 {
4178 if (!idev || !idev->dev)
4179 return;
4180
4181 if (idev->cnf.disable_ipv6)
4182 addrconf_notify(NULL, NETDEV_DOWN, idev->dev);
4183 else
4184 addrconf_notify(NULL, NETDEV_UP, idev->dev);
4185 }
4186
4187 static void addrconf_disable_change(struct net *net, __s32 newf)
4188 {
4189 struct net_device *dev;
4190 struct inet6_dev *idev;
4191
4192 rcu_read_lock();
4193 for_each_netdev_rcu(net, dev) {
4194 idev = __in6_dev_get(dev);
4195 if (idev) {
4196 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4197 idev->cnf.disable_ipv6 = newf;
4198 if (changed)
4199 dev_disable_change(idev);
4200 }
4201 }
4202 rcu_read_unlock();
4203 }
4204
4205 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int old)
4206 {
4207 struct net *net;
4208
4209 net = (struct net *)table->extra2;
4210
4211 if (p == &net->ipv6.devconf_dflt->disable_ipv6)
4212 return 0;
4213
4214 if (!rtnl_trylock()) {
4215 /* Restore the original values before restarting */
4216 *p = old;
4217 return restart_syscall();
4218 }
4219
4220 if (p == &net->ipv6.devconf_all->disable_ipv6) {
4221 __s32 newf = net->ipv6.devconf_all->disable_ipv6;
4222 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4223 addrconf_disable_change(net, newf);
4224 } else if ((!*p) ^ (!old))
4225 dev_disable_change((struct inet6_dev *)table->extra1);
4226
4227 rtnl_unlock();
4228 return 0;
4229 }
4230
4231 static
4232 int addrconf_sysctl_disable(ctl_table *ctl, int write,
4233 void __user *buffer, size_t *lenp, loff_t *ppos)
4234 {
4235 int *valp = ctl->data;
4236 int val = *valp;
4237 loff_t pos = *ppos;
4238 int ret;
4239
4240 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
4241
4242 if (write)
4243 ret = addrconf_disable_ipv6(ctl, valp, val);
4244 if (ret)
4245 *ppos = pos;
4246 return ret;
4247 }
4248
4249 static struct addrconf_sysctl_table
4250 {
4251 struct ctl_table_header *sysctl_header;
4252 ctl_table addrconf_vars[DEVCONF_MAX+1];
4253 char *dev_name;
4254 } addrconf_sysctl __read_mostly = {
4255 .sysctl_header = NULL,
4256 .addrconf_vars = {
4257 {
4258 .procname = "forwarding",
4259 .data = &ipv6_devconf.forwarding,
4260 .maxlen = sizeof(int),
4261 .mode = 0644,
4262 .proc_handler = addrconf_sysctl_forward,
4263 },
4264 {
4265 .procname = "hop_limit",
4266 .data = &ipv6_devconf.hop_limit,
4267 .maxlen = sizeof(int),
4268 .mode = 0644,
4269 .proc_handler = proc_dointvec,
4270 },
4271 {
4272 .procname = "mtu",
4273 .data = &ipv6_devconf.mtu6,
4274 .maxlen = sizeof(int),
4275 .mode = 0644,
4276 .proc_handler = proc_dointvec,
4277 },
4278 {
4279 .procname = "accept_ra",
4280 .data = &ipv6_devconf.accept_ra,
4281 .maxlen = sizeof(int),
4282 .mode = 0644,
4283 .proc_handler = proc_dointvec,
4284 },
4285 {
4286 .procname = "accept_redirects",
4287 .data = &ipv6_devconf.accept_redirects,
4288 .maxlen = sizeof(int),
4289 .mode = 0644,
4290 .proc_handler = proc_dointvec,
4291 },
4292 {
4293 .procname = "autoconf",
4294 .data = &ipv6_devconf.autoconf,
4295 .maxlen = sizeof(int),
4296 .mode = 0644,
4297 .proc_handler = proc_dointvec,
4298 },
4299 {
4300 .procname = "dad_transmits",
4301 .data = &ipv6_devconf.dad_transmits,
4302 .maxlen = sizeof(int),
4303 .mode = 0644,
4304 .proc_handler = proc_dointvec,
4305 },
4306 {
4307 .procname = "router_solicitations",
4308 .data = &ipv6_devconf.rtr_solicits,
4309 .maxlen = sizeof(int),
4310 .mode = 0644,
4311 .proc_handler = proc_dointvec,
4312 },
4313 {
4314 .procname = "router_solicitation_interval",
4315 .data = &ipv6_devconf.rtr_solicit_interval,
4316 .maxlen = sizeof(int),
4317 .mode = 0644,
4318 .proc_handler = proc_dointvec_jiffies,
4319 },
4320 {
4321 .procname = "router_solicitation_delay",
4322 .data = &ipv6_devconf.rtr_solicit_delay,
4323 .maxlen = sizeof(int),
4324 .mode = 0644,
4325 .proc_handler = proc_dointvec_jiffies,
4326 },
4327 {
4328 .procname = "force_mld_version",
4329 .data = &ipv6_devconf.force_mld_version,
4330 .maxlen = sizeof(int),
4331 .mode = 0644,
4332 .proc_handler = proc_dointvec,
4333 },
4334 #ifdef CONFIG_IPV6_PRIVACY
4335 {
4336 .procname = "use_tempaddr",
4337 .data = &ipv6_devconf.use_tempaddr,
4338 .maxlen = sizeof(int),
4339 .mode = 0644,
4340 .proc_handler = proc_dointvec,
4341 },
4342 {
4343 .procname = "temp_valid_lft",
4344 .data = &ipv6_devconf.temp_valid_lft,
4345 .maxlen = sizeof(int),
4346 .mode = 0644,
4347 .proc_handler = proc_dointvec,
4348 },
4349 {
4350 .procname = "temp_prefered_lft",
4351 .data = &ipv6_devconf.temp_prefered_lft,
4352 .maxlen = sizeof(int),
4353 .mode = 0644,
4354 .proc_handler = proc_dointvec,
4355 },
4356 {
4357 .procname = "regen_max_retry",
4358 .data = &ipv6_devconf.regen_max_retry,
4359 .maxlen = sizeof(int),
4360 .mode = 0644,
4361 .proc_handler = proc_dointvec,
4362 },
4363 {
4364 .procname = "max_desync_factor",
4365 .data = &ipv6_devconf.max_desync_factor,
4366 .maxlen = sizeof(int),
4367 .mode = 0644,
4368 .proc_handler = proc_dointvec,
4369 },
4370 #endif
4371 {
4372 .procname = "max_addresses",
4373 .data = &ipv6_devconf.max_addresses,
4374 .maxlen = sizeof(int),
4375 .mode = 0644,
4376 .proc_handler = proc_dointvec,
4377 },
4378 {
4379 .procname = "accept_ra_defrtr",
4380 .data = &ipv6_devconf.accept_ra_defrtr,
4381 .maxlen = sizeof(int),
4382 .mode = 0644,
4383 .proc_handler = proc_dointvec,
4384 },
4385 {
4386 .procname = "accept_ra_pinfo",
4387 .data = &ipv6_devconf.accept_ra_pinfo,
4388 .maxlen = sizeof(int),
4389 .mode = 0644,
4390 .proc_handler = proc_dointvec,
4391 },
4392 #ifdef CONFIG_IPV6_ROUTER_PREF
4393 {
4394 .procname = "accept_ra_rtr_pref",
4395 .data = &ipv6_devconf.accept_ra_rtr_pref,
4396 .maxlen = sizeof(int),
4397 .mode = 0644,
4398 .proc_handler = proc_dointvec,
4399 },
4400 {
4401 .procname = "router_probe_interval",
4402 .data = &ipv6_devconf.rtr_probe_interval,
4403 .maxlen = sizeof(int),
4404 .mode = 0644,
4405 .proc_handler = proc_dointvec_jiffies,
4406 },
4407 #ifdef CONFIG_IPV6_ROUTE_INFO
4408 {
4409 .procname = "accept_ra_rt_info_max_plen",
4410 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4411 .maxlen = sizeof(int),
4412 .mode = 0644,
4413 .proc_handler = proc_dointvec,
4414 },
4415 #endif
4416 #endif
4417 {
4418 .procname = "proxy_ndp",
4419 .data = &ipv6_devconf.proxy_ndp,
4420 .maxlen = sizeof(int),
4421 .mode = 0644,
4422 .proc_handler = proc_dointvec,
4423 },
4424 {
4425 .procname = "accept_source_route",
4426 .data = &ipv6_devconf.accept_source_route,
4427 .maxlen = sizeof(int),
4428 .mode = 0644,
4429 .proc_handler = proc_dointvec,
4430 },
4431 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4432 {
4433 .procname = "optimistic_dad",
4434 .data = &ipv6_devconf.optimistic_dad,
4435 .maxlen = sizeof(int),
4436 .mode = 0644,
4437 .proc_handler = proc_dointvec,
4438
4439 },
4440 #endif
4441 #ifdef CONFIG_IPV6_MROUTE
4442 {
4443 .procname = "mc_forwarding",
4444 .data = &ipv6_devconf.mc_forwarding,
4445 .maxlen = sizeof(int),
4446 .mode = 0444,
4447 .proc_handler = proc_dointvec,
4448 },
4449 #endif
4450 {
4451 .procname = "disable_ipv6",
4452 .data = &ipv6_devconf.disable_ipv6,
4453 .maxlen = sizeof(int),
4454 .mode = 0644,
4455 .proc_handler = addrconf_sysctl_disable,
4456 },
4457 {
4458 .procname = "accept_dad",
4459 .data = &ipv6_devconf.accept_dad,
4460 .maxlen = sizeof(int),
4461 .mode = 0644,
4462 .proc_handler = proc_dointvec,
4463 },
4464 {
4465 .procname = "force_tllao",
4466 .data = &ipv6_devconf.force_tllao,
4467 .maxlen = sizeof(int),
4468 .mode = 0644,
4469 .proc_handler = proc_dointvec
4470 },
4471 {
4472 /* sentinel */
4473 }
4474 },
4475 };
4476
4477 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4478 struct inet6_dev *idev, struct ipv6_devconf *p)
4479 {
4480 int i;
4481 struct addrconf_sysctl_table *t;
4482
4483 #define ADDRCONF_CTL_PATH_DEV 3
4484
4485 struct ctl_path addrconf_ctl_path[] = {
4486 { .procname = "net", },
4487 { .procname = "ipv6", },
4488 { .procname = "conf", },
4489 { /* to be set */ },
4490 { },
4491 };
4492
4493
4494 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4495 if (t == NULL)
4496 goto out;
4497
4498 for (i = 0; t->addrconf_vars[i].data; i++) {
4499 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
4500 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4501 t->addrconf_vars[i].extra2 = net;
4502 }
4503
4504 /*
4505 * Make a copy of dev_name, because '.procname' is regarded as const
4506 * by sysctl and we wouldn't want anyone to change it under our feet
4507 * (see SIOCSIFNAME).
4508 */
4509 t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4510 if (!t->dev_name)
4511 goto free;
4512
4513 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
4514
4515 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
4516 t->addrconf_vars);
4517 if (t->sysctl_header == NULL)
4518 goto free_procname;
4519
4520 p->sysctl = t;
4521 return 0;
4522
4523 free_procname:
4524 kfree(t->dev_name);
4525 free:
4526 kfree(t);
4527 out:
4528 return -ENOBUFS;
4529 }
4530
4531 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4532 {
4533 struct addrconf_sysctl_table *t;
4534
4535 if (p->sysctl == NULL)
4536 return;
4537
4538 t = p->sysctl;
4539 p->sysctl = NULL;
4540 unregister_net_sysctl_table(t->sysctl_header);
4541 kfree(t->dev_name);
4542 kfree(t);
4543 }
4544
4545 static void addrconf_sysctl_register(struct inet6_dev *idev)
4546 {
4547 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
4548 &ndisc_ifinfo_sysctl_change);
4549 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
4550 idev, &idev->cnf);
4551 }
4552
4553 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
4554 {
4555 __addrconf_sysctl_unregister(&idev->cnf);
4556 neigh_sysctl_unregister(idev->nd_parms);
4557 }
4558
4559
4560 #endif
4561
4562 static int __net_init addrconf_init_net(struct net *net)
4563 {
4564 int err;
4565 struct ipv6_devconf *all, *dflt;
4566
4567 err = -ENOMEM;
4568 all = &ipv6_devconf;
4569 dflt = &ipv6_devconf_dflt;
4570
4571 if (!net_eq(net, &init_net)) {
4572 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4573 if (all == NULL)
4574 goto err_alloc_all;
4575
4576 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4577 if (dflt == NULL)
4578 goto err_alloc_dflt;
4579 } else {
4580 /* these will be inherited by all namespaces */
4581 dflt->autoconf = ipv6_defaults.autoconf;
4582 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
4583 }
4584
4585 net->ipv6.devconf_all = all;
4586 net->ipv6.devconf_dflt = dflt;
4587
4588 #ifdef CONFIG_SYSCTL
4589 err = __addrconf_sysctl_register(net, "all", NULL, all);
4590 if (err < 0)
4591 goto err_reg_all;
4592
4593 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
4594 if (err < 0)
4595 goto err_reg_dflt;
4596 #endif
4597 return 0;
4598
4599 #ifdef CONFIG_SYSCTL
4600 err_reg_dflt:
4601 __addrconf_sysctl_unregister(all);
4602 err_reg_all:
4603 kfree(dflt);
4604 #endif
4605 err_alloc_dflt:
4606 kfree(all);
4607 err_alloc_all:
4608 return err;
4609 }
4610
4611 static void __net_exit addrconf_exit_net(struct net *net)
4612 {
4613 #ifdef CONFIG_SYSCTL
4614 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4615 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4616 #endif
4617 if (!net_eq(net, &init_net)) {
4618 kfree(net->ipv6.devconf_dflt);
4619 kfree(net->ipv6.devconf_all);
4620 }
4621 }
4622
4623 static struct pernet_operations addrconf_ops = {
4624 .init = addrconf_init_net,
4625 .exit = addrconf_exit_net,
4626 };
4627
4628 /*
4629 * Device notifier
4630 */
4631
4632 int register_inet6addr_notifier(struct notifier_block *nb)
4633 {
4634 return atomic_notifier_chain_register(&inet6addr_chain, nb);
4635 }
4636 EXPORT_SYMBOL(register_inet6addr_notifier);
4637
4638 int unregister_inet6addr_notifier(struct notifier_block *nb)
4639 {
4640 return atomic_notifier_chain_unregister(&inet6addr_chain, nb);
4641 }
4642 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4643
4644 static struct rtnl_af_ops inet6_ops = {
4645 .family = AF_INET6,
4646 .fill_link_af = inet6_fill_link_af,
4647 .get_link_af_size = inet6_get_link_af_size,
4648 };
4649
4650 /*
4651 * Init / cleanup code
4652 */
4653
4654 int __init addrconf_init(void)
4655 {
4656 int i, err;
4657
4658 err = ipv6_addr_label_init();
4659 if (err < 0) {
4660 printk(KERN_CRIT "IPv6 Addrconf:"
4661 " cannot initialize default policy table: %d.\n", err);
4662 goto out;
4663 }
4664
4665 err = register_pernet_subsys(&addrconf_ops);
4666 if (err < 0)
4667 goto out_addrlabel;
4668
4669 /* The addrconf netdev notifier requires that loopback_dev
4670 * has it's ipv6 private information allocated and setup
4671 * before it can bring up and give link-local addresses
4672 * to other devices which are up.
4673 *
4674 * Unfortunately, loopback_dev is not necessarily the first
4675 * entry in the global dev_base list of net devices. In fact,
4676 * it is likely to be the very last entry on that list.
4677 * So this causes the notifier registry below to try and
4678 * give link-local addresses to all devices besides loopback_dev
4679 * first, then loopback_dev, which cases all the non-loopback_dev
4680 * devices to fail to get a link-local address.
4681 *
4682 * So, as a temporary fix, allocate the ipv6 structure for
4683 * loopback_dev first by hand.
4684 * Longer term, all of the dependencies ipv6 has upon the loopback
4685 * device and it being up should be removed.
4686 */
4687 rtnl_lock();
4688 if (!ipv6_add_dev(init_net.loopback_dev))
4689 err = -ENOMEM;
4690 rtnl_unlock();
4691 if (err)
4692 goto errlo;
4693
4694 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4695 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
4696
4697 register_netdevice_notifier(&ipv6_dev_notf);
4698
4699 addrconf_verify(0);
4700
4701 err = rtnl_af_register(&inet6_ops);
4702 if (err < 0)
4703 goto errout_af;
4704
4705 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4706 if (err < 0)
4707 goto errout;
4708
4709 /* Only the first call to __rtnl_register can fail */
4710 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4711 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4712 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4713 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4714 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4715
4716 ipv6_addr_label_rtnl_register();
4717
4718 return 0;
4719 errout:
4720 rtnl_af_unregister(&inet6_ops);
4721 errout_af:
4722 unregister_netdevice_notifier(&ipv6_dev_notf);
4723 errlo:
4724 unregister_pernet_subsys(&addrconf_ops);
4725 out_addrlabel:
4726 ipv6_addr_label_cleanup();
4727 out:
4728 return err;
4729 }
4730
4731 void addrconf_cleanup(void)
4732 {
4733 struct net_device *dev;
4734 int i;
4735
4736 unregister_netdevice_notifier(&ipv6_dev_notf);
4737 unregister_pernet_subsys(&addrconf_ops);
4738 ipv6_addr_label_cleanup();
4739
4740 rtnl_lock();
4741
4742 __rtnl_af_unregister(&inet6_ops);
4743
4744 /* clean dev list */
4745 for_each_netdev(&init_net, dev) {
4746 if (__in6_dev_get(dev) == NULL)
4747 continue;
4748 addrconf_ifdown(dev, 1);
4749 }
4750 addrconf_ifdown(init_net.loopback_dev, 2);
4751
4752 /*
4753 * Check hash table.
4754 */
4755 spin_lock_bh(&addrconf_hash_lock);
4756 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4757 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
4758 spin_unlock_bh(&addrconf_hash_lock);
4759
4760 del_timer(&addr_chk_timer);
4761 rtnl_unlock();
4762 }
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree