[NETNS]: Clean out the ipv6-related sysctls creation/destruction
[linux-2.6.git] / net / ipv6 / addrconf.c
1 /*
2  *      IPv6 Address [auto]configuration
3  *      Linux INET6 implementation
4  *
5  *      Authors:
6  *      Pedro Roque             <roque@di.fc.ul.pt>
7  *      Alexey Kuznetsov        <kuznet@ms2.inr.ac.ru>
8  *
9  *      $Id: addrconf.c,v 1.69 2001/10/31 21:55:54 davem Exp $
10  *
11  *      This program is free software; you can redistribute it and/or
12  *      modify it under the terms of the GNU General Public License
13  *      as published by the Free Software Foundation; either version
14  *      2 of the License, or (at your option) any later version.
15  */
16
17 /*
18  *      Changes:
19  *
20  *      Janos Farkas                    :       delete timer on ifdown
21  *      <chexum@bankinf.banki.hu>
22  *      Andi Kleen                      :       kill double kfree on module
23  *                                              unload.
24  *      Maciej W. Rozycki               :       FDDI support
25  *      sekiya@USAGI                    :       Don't send too many RS
26  *                                              packets.
27  *      yoshfuji@USAGI                  :       Fixed interval between DAD
28  *                                              packets.
29  *      YOSHIFUJI Hideaki @USAGI        :       improved accuracy of
30  *                                              address validation timer.
31  *      YOSHIFUJI Hideaki @USAGI        :       Privacy Extensions (RFC3041)
32  *                                              support.
33  *      Yuji SEKIYA @USAGI              :       Don't assign a same IPv6
34  *                                              address on a same interface.
35  *      YOSHIFUJI Hideaki @USAGI        :       ARCnet support
36  *      YOSHIFUJI Hideaki @USAGI        :       convert /proc/net/if_inet6 to
37  *                                              seq_file.
38  *      YOSHIFUJI Hideaki @USAGI        :       improved source address
39  *                                              selection; consider scope,
40  *                                              status etc.
41  */
42
43 #include <linux/errno.h>
44 #include <linux/types.h>
45 #include <linux/socket.h>
46 #include <linux/sockios.h>
47 #include <linux/net.h>
48 #include <linux/in6.h>
49 #include <linux/netdevice.h>
50 #include <linux/if_addr.h>
51 #include <linux/if_arp.h>
52 #include <linux/if_arcnet.h>
53 #include <linux/if_infiniband.h>
54 #include <linux/route.h>
55 #include <linux/inetdevice.h>
56 #include <linux/init.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 <asm/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 #define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b)))
102
103 #ifdef CONFIG_SYSCTL
104 static void addrconf_sysctl_register(struct inet6_dev *idev);
105 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
106 #else
107 static inline void addrconf_sysctl_register(struct inet6_dev *idev)
108 {
109 }
110
111 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
112 {
113 }
114 #endif
115
116 #ifdef CONFIG_IPV6_PRIVACY
117 static int __ipv6_regen_rndid(struct inet6_dev *idev);
118 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
119 static void ipv6_regen_rndid(unsigned long data);
120
121 static int desync_factor = MAX_DESYNC_FACTOR * HZ;
122 #endif
123
124 static int ipv6_count_addresses(struct inet6_dev *idev);
125
126 /*
127  *      Configured unicast address hash table
128  */
129 static struct inet6_ifaddr              *inet6_addr_lst[IN6_ADDR_HSIZE];
130 static DEFINE_RWLOCK(addrconf_hash_lock);
131
132 static void addrconf_verify(unsigned long);
133
134 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
135 static DEFINE_SPINLOCK(addrconf_verify_lock);
136
137 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
138 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
139
140 static int addrconf_ifdown(struct net_device *dev, int how);
141
142 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
143 static void addrconf_dad_timer(unsigned long data);
144 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
145 static void addrconf_dad_run(struct inet6_dev *idev);
146 static void addrconf_rs_timer(unsigned long data);
147 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
148 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
149
150 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
151                                 struct prefix_info *pinfo);
152 static int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev);
153
154 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
155
156 struct ipv6_devconf ipv6_devconf __read_mostly = {
157         .forwarding             = 0,
158         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
159         .mtu6                   = IPV6_MIN_MTU,
160         .accept_ra              = 1,
161         .accept_redirects       = 1,
162         .autoconf               = 1,
163         .force_mld_version      = 0,
164         .dad_transmits          = 1,
165         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
166         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
167         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
168 #ifdef CONFIG_IPV6_PRIVACY
169         .use_tempaddr           = 0,
170         .temp_valid_lft         = TEMP_VALID_LIFETIME,
171         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
172         .regen_max_retry        = REGEN_MAX_RETRY,
173         .max_desync_factor      = MAX_DESYNC_FACTOR,
174 #endif
175         .max_addresses          = IPV6_MAX_ADDRESSES,
176         .accept_ra_defrtr       = 1,
177         .accept_ra_pinfo        = 1,
178 #ifdef CONFIG_IPV6_ROUTER_PREF
179         .accept_ra_rtr_pref     = 1,
180         .rtr_probe_interval     = 60 * HZ,
181 #ifdef CONFIG_IPV6_ROUTE_INFO
182         .accept_ra_rt_info_max_plen = 0,
183 #endif
184 #endif
185         .proxy_ndp              = 0,
186         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
187 };
188
189 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
190         .forwarding             = 0,
191         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
192         .mtu6                   = IPV6_MIN_MTU,
193         .accept_ra              = 1,
194         .accept_redirects       = 1,
195         .autoconf               = 1,
196         .dad_transmits          = 1,
197         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
198         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
199         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
200 #ifdef CONFIG_IPV6_PRIVACY
201         .use_tempaddr           = 0,
202         .temp_valid_lft         = TEMP_VALID_LIFETIME,
203         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
204         .regen_max_retry        = REGEN_MAX_RETRY,
205         .max_desync_factor      = MAX_DESYNC_FACTOR,
206 #endif
207         .max_addresses          = IPV6_MAX_ADDRESSES,
208         .accept_ra_defrtr       = 1,
209         .accept_ra_pinfo        = 1,
210 #ifdef CONFIG_IPV6_ROUTER_PREF
211         .accept_ra_rtr_pref     = 1,
212         .rtr_probe_interval     = 60 * HZ,
213 #ifdef CONFIG_IPV6_ROUTE_INFO
214         .accept_ra_rt_info_max_plen = 0,
215 #endif
216 #endif
217         .proxy_ndp              = 0,
218         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
219 };
220
221 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
222 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
223 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
224
225 /* Check if a valid qdisc is available */
226 static inline int addrconf_qdisc_ok(struct net_device *dev)
227 {
228         return (dev->qdisc != &noop_qdisc);
229 }
230
231 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
232 {
233         if (del_timer(&ifp->timer))
234                 __in6_ifa_put(ifp);
235 }
236
237 enum addrconf_timer_t
238 {
239         AC_NONE,
240         AC_DAD,
241         AC_RS,
242 };
243
244 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
245                                enum addrconf_timer_t what,
246                                unsigned long when)
247 {
248         if (!del_timer(&ifp->timer))
249                 in6_ifa_hold(ifp);
250
251         switch (what) {
252         case AC_DAD:
253                 ifp->timer.function = addrconf_dad_timer;
254                 break;
255         case AC_RS:
256                 ifp->timer.function = addrconf_rs_timer;
257                 break;
258         default:;
259         }
260         ifp->timer.expires = jiffies + when;
261         add_timer(&ifp->timer);
262 }
263
264 static int snmp6_alloc_dev(struct inet6_dev *idev)
265 {
266         if (snmp_mib_init((void **)idev->stats.ipv6,
267                           sizeof(struct ipstats_mib)) < 0)
268                 goto err_ip;
269         if (snmp_mib_init((void **)idev->stats.icmpv6,
270                           sizeof(struct icmpv6_mib)) < 0)
271                 goto err_icmp;
272         if (snmp_mib_init((void **)idev->stats.icmpv6msg,
273                           sizeof(struct icmpv6msg_mib)) < 0)
274                 goto err_icmpmsg;
275
276         return 0;
277
278 err_icmpmsg:
279         snmp_mib_free((void **)idev->stats.icmpv6);
280 err_icmp:
281         snmp_mib_free((void **)idev->stats.ipv6);
282 err_ip:
283         return -ENOMEM;
284 }
285
286 static void snmp6_free_dev(struct inet6_dev *idev)
287 {
288         snmp_mib_free((void **)idev->stats.icmpv6msg);
289         snmp_mib_free((void **)idev->stats.icmpv6);
290         snmp_mib_free((void **)idev->stats.ipv6);
291 }
292
293 /* Nobody refers to this device, we may destroy it. */
294
295 static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
296 {
297         struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
298         kfree(idev);
299 }
300
301 void in6_dev_finish_destroy(struct inet6_dev *idev)
302 {
303         struct net_device *dev = idev->dev;
304         BUG_TRAP(idev->addr_list==NULL);
305         BUG_TRAP(idev->mc_list==NULL);
306 #ifdef NET_REFCNT_DEBUG
307         printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
308 #endif
309         dev_put(dev);
310         if (!idev->dead) {
311                 printk("Freeing alive inet6 device %p\n", idev);
312                 return;
313         }
314         snmp6_free_dev(idev);
315         call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
316 }
317
318 EXPORT_SYMBOL(in6_dev_finish_destroy);
319
320 static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
321 {
322         struct inet6_dev *ndev;
323         struct in6_addr maddr;
324
325         ASSERT_RTNL();
326
327         if (dev->mtu < IPV6_MIN_MTU)
328                 return NULL;
329
330         ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
331
332         if (ndev == NULL)
333                 return NULL;
334
335         rwlock_init(&ndev->lock);
336         ndev->dev = dev;
337         memcpy(&ndev->cnf, &ipv6_devconf_dflt, sizeof(ndev->cnf));
338         ndev->cnf.mtu6 = dev->mtu;
339         ndev->cnf.sysctl = NULL;
340         ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
341         if (ndev->nd_parms == NULL) {
342                 kfree(ndev);
343                 return NULL;
344         }
345         /* We refer to the device */
346         dev_hold(dev);
347
348         if (snmp6_alloc_dev(ndev) < 0) {
349                 ADBG((KERN_WARNING
350                         "%s(): cannot allocate memory for statistics; dev=%s.\n",
351                         __FUNCTION__, dev->name));
352                 neigh_parms_release(&nd_tbl, ndev->nd_parms);
353                 ndev->dead = 1;
354                 in6_dev_finish_destroy(ndev);
355                 return NULL;
356         }
357
358         if (snmp6_register_dev(ndev) < 0) {
359                 ADBG((KERN_WARNING
360                         "%s(): cannot create /proc/net/dev_snmp6/%s\n",
361                         __FUNCTION__, dev->name));
362                 neigh_parms_release(&nd_tbl, ndev->nd_parms);
363                 ndev->dead = 1;
364                 in6_dev_finish_destroy(ndev);
365                 return NULL;
366         }
367
368         /* One reference from device.  We must do this before
369          * we invoke __ipv6_regen_rndid().
370          */
371         in6_dev_hold(ndev);
372
373 #ifdef CONFIG_IPV6_PRIVACY
374         setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
375         if ((dev->flags&IFF_LOOPBACK) ||
376             dev->type == ARPHRD_TUNNEL ||
377 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
378             dev->type == ARPHRD_SIT ||
379 #endif
380             dev->type == ARPHRD_NONE) {
381                 printk(KERN_INFO
382                        "%s: Disabled Privacy Extensions\n",
383                        dev->name);
384                 ndev->cnf.use_tempaddr = -1;
385
386                 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
387                         printk(KERN_INFO
388                                "%s: Disabled Multicast RS\n",
389                                dev->name);
390                         ndev->cnf.rtr_solicits = 0;
391                 }
392         } else {
393                 in6_dev_hold(ndev);
394                 ipv6_regen_rndid((unsigned long) ndev);
395         }
396 #endif
397
398         if (netif_running(dev) && addrconf_qdisc_ok(dev))
399                 ndev->if_flags |= IF_READY;
400
401         ipv6_mc_init_dev(ndev);
402         ndev->tstamp = jiffies;
403         addrconf_sysctl_register(ndev);
404         /* protected by rtnl_lock */
405         rcu_assign_pointer(dev->ip6_ptr, ndev);
406
407         /* Join all-node multicast group */
408         ipv6_addr_all_nodes(&maddr);
409         ipv6_dev_mc_inc(dev, &maddr);
410
411         return ndev;
412 }
413
414 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
415 {
416         struct inet6_dev *idev;
417
418         ASSERT_RTNL();
419
420         if ((idev = __in6_dev_get(dev)) == NULL) {
421                 if ((idev = ipv6_add_dev(dev)) == NULL)
422                         return NULL;
423         }
424
425         if (dev->flags&IFF_UP)
426                 ipv6_mc_up(idev);
427         return idev;
428 }
429
430 #ifdef CONFIG_SYSCTL
431 static void dev_forward_change(struct inet6_dev *idev)
432 {
433         struct net_device *dev;
434         struct inet6_ifaddr *ifa;
435         struct in6_addr addr;
436
437         if (!idev)
438                 return;
439         dev = idev->dev;
440         if (dev && (dev->flags & IFF_MULTICAST)) {
441                 ipv6_addr_all_routers(&addr);
442
443                 if (idev->cnf.forwarding)
444                         ipv6_dev_mc_inc(dev, &addr);
445                 else
446                         ipv6_dev_mc_dec(dev, &addr);
447         }
448         for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
449                 if (ifa->flags&IFA_F_TENTATIVE)
450                         continue;
451                 if (idev->cnf.forwarding)
452                         addrconf_join_anycast(ifa);
453                 else
454                         addrconf_leave_anycast(ifa);
455         }
456 }
457
458
459 static void addrconf_forward_change(void)
460 {
461         struct net_device *dev;
462         struct inet6_dev *idev;
463
464         read_lock(&dev_base_lock);
465         for_each_netdev(&init_net, dev) {
466                 rcu_read_lock();
467                 idev = __in6_dev_get(dev);
468                 if (idev) {
469                         int changed = (!idev->cnf.forwarding) ^ (!ipv6_devconf.forwarding);
470                         idev->cnf.forwarding = ipv6_devconf.forwarding;
471                         if (changed)
472                                 dev_forward_change(idev);
473                 }
474                 rcu_read_unlock();
475         }
476         read_unlock(&dev_base_lock);
477 }
478
479 static void addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old)
480 {
481         if (p == &ipv6_devconf_dflt.forwarding)
482                 return;
483
484         if (p == &ipv6_devconf.forwarding) {
485                 ipv6_devconf_dflt.forwarding = ipv6_devconf.forwarding;
486                 addrconf_forward_change();
487         } else if ((!*p) ^ (!old))
488                 dev_forward_change((struct inet6_dev *)table->extra1);
489
490         if (*p)
491                 rt6_purge_dflt_routers();
492 }
493 #endif
494
495 /* Nobody refers to this ifaddr, destroy it */
496
497 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
498 {
499         BUG_TRAP(ifp->if_next==NULL);
500         BUG_TRAP(ifp->lst_next==NULL);
501 #ifdef NET_REFCNT_DEBUG
502         printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
503 #endif
504
505         in6_dev_put(ifp->idev);
506
507         if (del_timer(&ifp->timer))
508                 printk("Timer is still running, when freeing ifa=%p\n", ifp);
509
510         if (!ifp->dead) {
511                 printk("Freeing alive inet6 address %p\n", ifp);
512                 return;
513         }
514         dst_release(&ifp->rt->u.dst);
515
516         kfree(ifp);
517 }
518
519 static void
520 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
521 {
522         struct inet6_ifaddr *ifa, **ifap;
523         int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
524
525         /*
526          * Each device address list is sorted in order of scope -
527          * global before linklocal.
528          */
529         for (ifap = &idev->addr_list; (ifa = *ifap) != NULL;
530              ifap = &ifa->if_next) {
531                 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
532                         break;
533         }
534
535         ifp->if_next = *ifap;
536         *ifap = ifp;
537 }
538
539 /* On success it returns ifp with increased reference count */
540
541 static struct inet6_ifaddr *
542 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
543               int scope, u32 flags)
544 {
545         struct inet6_ifaddr *ifa = NULL;
546         struct rt6_info *rt;
547         int hash;
548         int err = 0;
549
550         rcu_read_lock_bh();
551         if (idev->dead) {
552                 err = -ENODEV;                  /*XXX*/
553                 goto out2;
554         }
555
556         write_lock(&addrconf_hash_lock);
557
558         /* Ignore adding duplicate addresses on an interface */
559         if (ipv6_chk_same_addr(addr, idev->dev)) {
560                 ADBG(("ipv6_add_addr: already assigned\n"));
561                 err = -EEXIST;
562                 goto out;
563         }
564
565         ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
566
567         if (ifa == NULL) {
568                 ADBG(("ipv6_add_addr: malloc failed\n"));
569                 err = -ENOBUFS;
570                 goto out;
571         }
572
573         rt = addrconf_dst_alloc(idev, addr, 0);
574         if (IS_ERR(rt)) {
575                 err = PTR_ERR(rt);
576                 goto out;
577         }
578
579         ipv6_addr_copy(&ifa->addr, addr);
580
581         spin_lock_init(&ifa->lock);
582         init_timer(&ifa->timer);
583         ifa->timer.data = (unsigned long) ifa;
584         ifa->scope = scope;
585         ifa->prefix_len = pfxlen;
586         ifa->flags = flags | IFA_F_TENTATIVE;
587         ifa->cstamp = ifa->tstamp = jiffies;
588
589         ifa->rt = rt;
590
591         /*
592          * part one of RFC 4429, section 3.3
593          * We should not configure an address as
594          * optimistic if we do not yet know the link
595          * layer address of our nexhop router
596          */
597
598         if (rt->rt6i_nexthop == NULL)
599                 ifa->flags &= ~IFA_F_OPTIMISTIC;
600
601         ifa->idev = idev;
602         in6_dev_hold(idev);
603         /* For caller */
604         in6_ifa_hold(ifa);
605
606         /* Add to big hash table */
607         hash = ipv6_addr_hash(addr);
608
609         ifa->lst_next = inet6_addr_lst[hash];
610         inet6_addr_lst[hash] = ifa;
611         in6_ifa_hold(ifa);
612         write_unlock(&addrconf_hash_lock);
613
614         write_lock(&idev->lock);
615         /* Add to inet6_dev unicast addr list. */
616         ipv6_link_dev_addr(idev, ifa);
617
618 #ifdef CONFIG_IPV6_PRIVACY
619         if (ifa->flags&IFA_F_TEMPORARY) {
620                 ifa->tmp_next = idev->tempaddr_list;
621                 idev->tempaddr_list = ifa;
622                 in6_ifa_hold(ifa);
623         }
624 #endif
625
626         in6_ifa_hold(ifa);
627         write_unlock(&idev->lock);
628 out2:
629         rcu_read_unlock_bh();
630
631         if (likely(err == 0))
632                 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
633         else {
634                 kfree(ifa);
635                 ifa = ERR_PTR(err);
636         }
637
638         return ifa;
639 out:
640         write_unlock(&addrconf_hash_lock);
641         goto out2;
642 }
643
644 /* This function wants to get referenced ifp and releases it before return */
645
646 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
647 {
648         struct inet6_ifaddr *ifa, **ifap;
649         struct inet6_dev *idev = ifp->idev;
650         int hash;
651         int deleted = 0, onlink = 0;
652         unsigned long expires = jiffies;
653
654         hash = ipv6_addr_hash(&ifp->addr);
655
656         ifp->dead = 1;
657
658         write_lock_bh(&addrconf_hash_lock);
659         for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
660              ifap = &ifa->lst_next) {
661                 if (ifa == ifp) {
662                         *ifap = ifa->lst_next;
663                         __in6_ifa_put(ifp);
664                         ifa->lst_next = NULL;
665                         break;
666                 }
667         }
668         write_unlock_bh(&addrconf_hash_lock);
669
670         write_lock_bh(&idev->lock);
671 #ifdef CONFIG_IPV6_PRIVACY
672         if (ifp->flags&IFA_F_TEMPORARY) {
673                 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
674                      ifap = &ifa->tmp_next) {
675                         if (ifa == ifp) {
676                                 *ifap = ifa->tmp_next;
677                                 if (ifp->ifpub) {
678                                         in6_ifa_put(ifp->ifpub);
679                                         ifp->ifpub = NULL;
680                                 }
681                                 __in6_ifa_put(ifp);
682                                 ifa->tmp_next = NULL;
683                                 break;
684                         }
685                 }
686         }
687 #endif
688
689         for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
690                 if (ifa == ifp) {
691                         *ifap = ifa->if_next;
692                         __in6_ifa_put(ifp);
693                         ifa->if_next = NULL;
694                         if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
695                                 break;
696                         deleted = 1;
697                         continue;
698                 } else if (ifp->flags & IFA_F_PERMANENT) {
699                         if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
700                                               ifp->prefix_len)) {
701                                 if (ifa->flags & IFA_F_PERMANENT) {
702                                         onlink = 1;
703                                         if (deleted)
704                                                 break;
705                                 } else {
706                                         unsigned long lifetime;
707
708                                         if (!onlink)
709                                                 onlink = -1;
710
711                                         spin_lock(&ifa->lock);
712                                         lifetime = min_t(unsigned long,
713                                                          ifa->valid_lft, 0x7fffffffUL/HZ);
714                                         if (time_before(expires,
715                                                         ifa->tstamp + lifetime * HZ))
716                                                 expires = ifa->tstamp + lifetime * HZ;
717                                         spin_unlock(&ifa->lock);
718                                 }
719                         }
720                 }
721                 ifap = &ifa->if_next;
722         }
723         write_unlock_bh(&idev->lock);
724
725         ipv6_ifa_notify(RTM_DELADDR, ifp);
726
727         atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
728
729         addrconf_del_timer(ifp);
730
731         /*
732          * Purge or update corresponding prefix
733          *
734          * 1) we don't purge prefix here if address was not permanent.
735          *    prefix is managed by its own lifetime.
736          * 2) if there're no addresses, delete prefix.
737          * 3) if there're still other permanent address(es),
738          *    corresponding prefix is still permanent.
739          * 4) otherwise, update prefix lifetime to the
740          *    longest valid lifetime among the corresponding
741          *    addresses on the device.
742          *    Note: subsequent RA will update lifetime.
743          *
744          * --yoshfuji
745          */
746         if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
747                 struct in6_addr prefix;
748                 struct rt6_info *rt;
749
750                 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
751                 rt = rt6_lookup(&prefix, NULL, ifp->idev->dev->ifindex, 1);
752
753                 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
754                         if (onlink == 0) {
755                                 ip6_del_rt(rt);
756                                 rt = NULL;
757                         } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
758                                 rt->rt6i_expires = expires;
759                                 rt->rt6i_flags |= RTF_EXPIRES;
760                         }
761                 }
762                 dst_release(&rt->u.dst);
763         }
764
765         in6_ifa_put(ifp);
766 }
767
768 #ifdef CONFIG_IPV6_PRIVACY
769 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
770 {
771         struct inet6_dev *idev = ifp->idev;
772         struct in6_addr addr, *tmpaddr;
773         unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
774         int tmp_plen;
775         int ret = 0;
776         int max_addresses;
777         u32 addr_flags;
778
779         write_lock(&idev->lock);
780         if (ift) {
781                 spin_lock_bh(&ift->lock);
782                 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
783                 spin_unlock_bh(&ift->lock);
784                 tmpaddr = &addr;
785         } else {
786                 tmpaddr = NULL;
787         }
788 retry:
789         in6_dev_hold(idev);
790         if (idev->cnf.use_tempaddr <= 0) {
791                 write_unlock(&idev->lock);
792                 printk(KERN_INFO
793                         "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
794                 in6_dev_put(idev);
795                 ret = -1;
796                 goto out;
797         }
798         spin_lock_bh(&ifp->lock);
799         if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
800                 idev->cnf.use_tempaddr = -1;    /*XXX*/
801                 spin_unlock_bh(&ifp->lock);
802                 write_unlock(&idev->lock);
803                 printk(KERN_WARNING
804                         "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
805                 in6_dev_put(idev);
806                 ret = -1;
807                 goto out;
808         }
809         in6_ifa_hold(ifp);
810         memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
811         if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
812                 spin_unlock_bh(&ifp->lock);
813                 write_unlock(&idev->lock);
814                 printk(KERN_WARNING
815                         "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
816                 in6_ifa_put(ifp);
817                 in6_dev_put(idev);
818                 ret = -1;
819                 goto out;
820         }
821         memcpy(&addr.s6_addr[8], idev->rndid, 8);
822         tmp_valid_lft = min_t(__u32,
823                               ifp->valid_lft,
824                               idev->cnf.temp_valid_lft);
825         tmp_prefered_lft = min_t(__u32,
826                                  ifp->prefered_lft,
827                                  idev->cnf.temp_prefered_lft - desync_factor / HZ);
828         tmp_plen = ifp->prefix_len;
829         max_addresses = idev->cnf.max_addresses;
830         tmp_cstamp = ifp->cstamp;
831         tmp_tstamp = ifp->tstamp;
832         spin_unlock_bh(&ifp->lock);
833
834         write_unlock(&idev->lock);
835
836         addr_flags = IFA_F_TEMPORARY;
837         /* set in addrconf_prefix_rcv() */
838         if (ifp->flags & IFA_F_OPTIMISTIC)
839                 addr_flags |= IFA_F_OPTIMISTIC;
840
841         ift = !max_addresses ||
842               ipv6_count_addresses(idev) < max_addresses ?
843                 ipv6_add_addr(idev, &addr, tmp_plen,
844                               ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
845                               addr_flags) : NULL;
846         if (!ift || IS_ERR(ift)) {
847                 in6_ifa_put(ifp);
848                 in6_dev_put(idev);
849                 printk(KERN_INFO
850                         "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
851                 tmpaddr = &addr;
852                 write_lock(&idev->lock);
853                 goto retry;
854         }
855
856         spin_lock_bh(&ift->lock);
857         ift->ifpub = ifp;
858         ift->valid_lft = tmp_valid_lft;
859         ift->prefered_lft = tmp_prefered_lft;
860         ift->cstamp = tmp_cstamp;
861         ift->tstamp = tmp_tstamp;
862         spin_unlock_bh(&ift->lock);
863
864         addrconf_dad_start(ift, 0);
865         in6_ifa_put(ift);
866         in6_dev_put(idev);
867 out:
868         return ret;
869 }
870 #endif
871
872 /*
873  *      Choose an appropriate source address (RFC3484)
874  */
875 struct ipv6_saddr_score {
876         int             addr_type;
877         unsigned int    attrs;
878         int             matchlen;
879         int             scope;
880         unsigned int    rule;
881 };
882
883 #define IPV6_SADDR_SCORE_LOCAL          0x0001
884 #define IPV6_SADDR_SCORE_PREFERRED      0x0004
885 #define IPV6_SADDR_SCORE_HOA            0x0008
886 #define IPV6_SADDR_SCORE_OIF            0x0010
887 #define IPV6_SADDR_SCORE_LABEL          0x0020
888 #define IPV6_SADDR_SCORE_PRIVACY        0x0040
889
890 static inline int ipv6_saddr_preferred(int type)
891 {
892         if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
893                     IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
894                 return 1;
895         return 0;
896 }
897
898 int ipv6_dev_get_saddr(struct net_device *daddr_dev,
899                        struct in6_addr *daddr, struct in6_addr *saddr)
900 {
901         struct ipv6_saddr_score hiscore;
902         struct inet6_ifaddr *ifa_result = NULL;
903         int daddr_type = __ipv6_addr_type(daddr);
904         int daddr_scope = __ipv6_addr_src_scope(daddr_type);
905         int daddr_ifindex = daddr_dev ? daddr_dev->ifindex : 0;
906         u32 daddr_label = ipv6_addr_label(daddr, daddr_type, daddr_ifindex);
907         struct net_device *dev;
908
909         memset(&hiscore, 0, sizeof(hiscore));
910
911         read_lock(&dev_base_lock);
912         rcu_read_lock();
913
914         for_each_netdev(&init_net, dev) {
915                 struct inet6_dev *idev;
916                 struct inet6_ifaddr *ifa;
917
918                 /* Rule 0: Candidate Source Address (section 4)
919                  *  - multicast and link-local destination address,
920                  *    the set of candidate source address MUST only
921                  *    include addresses assigned to interfaces
922                  *    belonging to the same link as the outgoing
923                  *    interface.
924                  * (- For site-local destination addresses, the
925                  *    set of candidate source addresses MUST only
926                  *    include addresses assigned to interfaces
927                  *    belonging to the same site as the outgoing
928                  *    interface.)
929                  */
930                 if ((daddr_type & IPV6_ADDR_MULTICAST ||
931                      daddr_scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
932                     daddr_dev && dev != daddr_dev)
933                         continue;
934
935                 idev = __in6_dev_get(dev);
936                 if (!idev)
937                         continue;
938
939                 read_lock_bh(&idev->lock);
940                 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
941                         struct ipv6_saddr_score score;
942
943                         score.addr_type = __ipv6_addr_type(&ifa->addr);
944
945                         /* Rule 0:
946                          * - Tentative Address (RFC2462 section 5.4)
947                          *  - A tentative address is not considered
948                          *    "assigned to an interface" in the traditional
949                          *    sense, unless it is also flagged as optimistic.
950                          * - Candidate Source Address (section 4)
951                          *  - In any case, anycast addresses, multicast
952                          *    addresses, and the unspecified address MUST
953                          *    NOT be included in a candidate set.
954                          */
955                         if ((ifa->flags & IFA_F_TENTATIVE) &&
956                             (!(ifa->flags & IFA_F_OPTIMISTIC)))
957                                 continue;
958                         if (unlikely(score.addr_type == IPV6_ADDR_ANY ||
959                                      score.addr_type & IPV6_ADDR_MULTICAST)) {
960                                 LIMIT_NETDEBUG(KERN_DEBUG
961                                                "ADDRCONF: unspecified / multicast address "
962                                                "assigned as unicast address on %s",
963                                                dev->name);
964                                 continue;
965                         }
966
967                         score.attrs = 0;
968                         score.matchlen = 0;
969                         score.scope = 0;
970                         score.rule = 0;
971
972                         if (ifa_result == NULL) {
973                                 /* record it if the first available entry */
974                                 goto record_it;
975                         }
976
977                         /* Rule 1: Prefer same address */
978                         if (hiscore.rule < 1) {
979                                 if (ipv6_addr_equal(&ifa_result->addr, daddr))
980                                         hiscore.attrs |= IPV6_SADDR_SCORE_LOCAL;
981                                 hiscore.rule++;
982                         }
983                         if (ipv6_addr_equal(&ifa->addr, daddr)) {
984                                 score.attrs |= IPV6_SADDR_SCORE_LOCAL;
985                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)) {
986                                         score.rule = 1;
987                                         goto record_it;
988                                 }
989                         } else {
990                                 if (hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)
991                                         continue;
992                         }
993
994                         /* Rule 2: Prefer appropriate scope */
995                         if (hiscore.rule < 2) {
996                                 hiscore.scope = __ipv6_addr_src_scope(hiscore.addr_type);
997                                 hiscore.rule++;
998                         }
999                         score.scope = __ipv6_addr_src_scope(score.addr_type);
1000                         if (hiscore.scope < score.scope) {
1001                                 if (hiscore.scope < daddr_scope) {
1002                                         score.rule = 2;
1003                                         goto record_it;
1004                                 } else
1005                                         continue;
1006                         } else if (score.scope < hiscore.scope) {
1007                                 if (score.scope < daddr_scope)
1008                                         break; /* addresses sorted by scope */
1009                                 else {
1010                                         score.rule = 2;
1011                                         goto record_it;
1012                                 }
1013                         }
1014
1015                         /* Rule 3: Avoid deprecated and optimistic addresses */
1016                         if (hiscore.rule < 3) {
1017                                 if (ipv6_saddr_preferred(hiscore.addr_type) ||
1018                                    (((ifa_result->flags &
1019                                     (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)) == 0)))
1020                                         hiscore.attrs |= IPV6_SADDR_SCORE_PREFERRED;
1021                                 hiscore.rule++;
1022                         }
1023                         if (ipv6_saddr_preferred(score.addr_type) ||
1024                            (((ifa->flags &
1025                             (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)) == 0))) {
1026                                 score.attrs |= IPV6_SADDR_SCORE_PREFERRED;
1027                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)) {
1028                                         score.rule = 3;
1029                                         goto record_it;
1030                                 }
1031                         } else {
1032                                 if (hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)
1033                                         continue;
1034                         }
1035
1036                         /* Rule 4: Prefer home address */
1037 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
1038                         if (hiscore.rule < 4) {
1039                                 if (ifa_result->flags & IFA_F_HOMEADDRESS)
1040                                         hiscore.attrs |= IPV6_SADDR_SCORE_HOA;
1041                                 hiscore.rule++;
1042                         }
1043                         if (ifa->flags & IFA_F_HOMEADDRESS) {
1044                                 score.attrs |= IPV6_SADDR_SCORE_HOA;
1045                                 if (!(ifa_result->flags & IFA_F_HOMEADDRESS)) {
1046                                         score.rule = 4;
1047                                         goto record_it;
1048                                 }
1049                         } else {
1050                                 if (hiscore.attrs & IPV6_SADDR_SCORE_HOA)
1051                                         continue;
1052                         }
1053 #else
1054                         if (hiscore.rule < 4)
1055                                 hiscore.rule++;
1056 #endif
1057
1058                         /* Rule 5: Prefer outgoing interface */
1059                         if (hiscore.rule < 5) {
1060                                 if (daddr_dev == NULL ||
1061                                     daddr_dev == ifa_result->idev->dev)
1062                                         hiscore.attrs |= IPV6_SADDR_SCORE_OIF;
1063                                 hiscore.rule++;
1064                         }
1065                         if (daddr_dev == NULL ||
1066                             daddr_dev == ifa->idev->dev) {
1067                                 score.attrs |= IPV6_SADDR_SCORE_OIF;
1068                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_OIF)) {
1069                                         score.rule = 5;
1070                                         goto record_it;
1071                                 }
1072                         } else {
1073                                 if (hiscore.attrs & IPV6_SADDR_SCORE_OIF)
1074                                         continue;
1075                         }
1076
1077                         /* Rule 6: Prefer matching label */
1078                         if (hiscore.rule < 6) {
1079                                 if (ipv6_addr_label(&ifa_result->addr,
1080                                                     hiscore.addr_type,
1081                                                     ifa_result->idev->dev->ifindex) == daddr_label)
1082                                         hiscore.attrs |= IPV6_SADDR_SCORE_LABEL;
1083                                 hiscore.rule++;
1084                         }
1085                         if (ipv6_addr_label(&ifa->addr,
1086                                             score.addr_type,
1087                                             ifa->idev->dev->ifindex) == daddr_label) {
1088                                 score.attrs |= IPV6_SADDR_SCORE_LABEL;
1089                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LABEL)) {
1090                                         score.rule = 6;
1091                                         goto record_it;
1092                                 }
1093                         } else {
1094                                 if (hiscore.attrs & IPV6_SADDR_SCORE_LABEL)
1095                                         continue;
1096                         }
1097
1098 #ifdef CONFIG_IPV6_PRIVACY
1099                         /* Rule 7: Prefer public address
1100                          * Note: prefer temprary address if use_tempaddr >= 2
1101                          */
1102                         if (hiscore.rule < 7) {
1103                                 if ((!(ifa_result->flags & IFA_F_TEMPORARY)) ^
1104                                     (ifa_result->idev->cnf.use_tempaddr >= 2))
1105                                         hiscore.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1106                                 hiscore.rule++;
1107                         }
1108                         if ((!(ifa->flags & IFA_F_TEMPORARY)) ^
1109                             (ifa->idev->cnf.use_tempaddr >= 2)) {
1110                                 score.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1111                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)) {
1112                                         score.rule = 7;
1113                                         goto record_it;
1114                                 }
1115                         } else {
1116                                 if (hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)
1117                                         continue;
1118                         }
1119 #else
1120                         if (hiscore.rule < 7)
1121                                 hiscore.rule++;
1122 #endif
1123                         /* Rule 8: Use longest matching prefix */
1124                         if (hiscore.rule < 8) {
1125                                 hiscore.matchlen = ipv6_addr_diff(&ifa_result->addr, daddr);
1126                                 hiscore.rule++;
1127                         }
1128                         score.matchlen = ipv6_addr_diff(&ifa->addr, daddr);
1129                         if (score.matchlen > hiscore.matchlen) {
1130                                 score.rule = 8;
1131                                 goto record_it;
1132                         }
1133 #if 0
1134                         else if (score.matchlen < hiscore.matchlen)
1135                                 continue;
1136 #endif
1137
1138                         /* Final Rule: choose first available one */
1139                         continue;
1140 record_it:
1141                         if (ifa_result)
1142                                 in6_ifa_put(ifa_result);
1143                         in6_ifa_hold(ifa);
1144                         ifa_result = ifa;
1145                         hiscore = score;
1146                 }
1147                 read_unlock_bh(&idev->lock);
1148         }
1149         rcu_read_unlock();
1150         read_unlock(&dev_base_lock);
1151
1152         if (!ifa_result)
1153                 return -EADDRNOTAVAIL;
1154
1155         ipv6_addr_copy(saddr, &ifa_result->addr);
1156         in6_ifa_put(ifa_result);
1157         return 0;
1158 }
1159
1160
1161 int ipv6_get_saddr(struct dst_entry *dst,
1162                    struct in6_addr *daddr, struct in6_addr *saddr)
1163 {
1164         return ipv6_dev_get_saddr(dst ? ip6_dst_idev(dst)->dev : NULL, daddr, saddr);
1165 }
1166
1167 EXPORT_SYMBOL(ipv6_get_saddr);
1168
1169 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1170                     unsigned char banned_flags)
1171 {
1172         struct inet6_dev *idev;
1173         int err = -EADDRNOTAVAIL;
1174
1175         rcu_read_lock();
1176         if ((idev = __in6_dev_get(dev)) != NULL) {
1177                 struct inet6_ifaddr *ifp;
1178
1179                 read_lock_bh(&idev->lock);
1180                 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1181                         if (ifp->scope == IFA_LINK && !(ifp->flags & banned_flags)) {
1182                                 ipv6_addr_copy(addr, &ifp->addr);
1183                                 err = 0;
1184                                 break;
1185                         }
1186                 }
1187                 read_unlock_bh(&idev->lock);
1188         }
1189         rcu_read_unlock();
1190         return err;
1191 }
1192
1193 static int ipv6_count_addresses(struct inet6_dev *idev)
1194 {
1195         int cnt = 0;
1196         struct inet6_ifaddr *ifp;
1197
1198         read_lock_bh(&idev->lock);
1199         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1200                 cnt++;
1201         read_unlock_bh(&idev->lock);
1202         return cnt;
1203 }
1204
1205 int ipv6_chk_addr(struct in6_addr *addr, struct net_device *dev, int strict)
1206 {
1207         struct inet6_ifaddr * ifp;
1208         u8 hash = ipv6_addr_hash(addr);
1209
1210         read_lock_bh(&addrconf_hash_lock);
1211         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1212                 if (ipv6_addr_equal(&ifp->addr, addr) &&
1213                     !(ifp->flags&IFA_F_TENTATIVE)) {
1214                         if (dev == NULL || ifp->idev->dev == dev ||
1215                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1216                                 break;
1217                 }
1218         }
1219         read_unlock_bh(&addrconf_hash_lock);
1220         return ifp != NULL;
1221 }
1222
1223 EXPORT_SYMBOL(ipv6_chk_addr);
1224
1225 static
1226 int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev)
1227 {
1228         struct inet6_ifaddr * ifp;
1229         u8 hash = ipv6_addr_hash(addr);
1230
1231         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1232                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1233                         if (dev == NULL || ifp->idev->dev == dev)
1234                                 break;
1235                 }
1236         }
1237         return ifp != NULL;
1238 }
1239
1240 struct inet6_ifaddr * ipv6_get_ifaddr(struct in6_addr *addr, struct net_device *dev, int strict)
1241 {
1242         struct inet6_ifaddr * ifp;
1243         u8 hash = ipv6_addr_hash(addr);
1244
1245         read_lock_bh(&addrconf_hash_lock);
1246         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1247                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1248                         if (dev == NULL || ifp->idev->dev == dev ||
1249                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1250                                 in6_ifa_hold(ifp);
1251                                 break;
1252                         }
1253                 }
1254         }
1255         read_unlock_bh(&addrconf_hash_lock);
1256
1257         return ifp;
1258 }
1259
1260 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1261 {
1262         const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
1263         const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
1264         __be32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
1265         __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1266         int sk_ipv6only = ipv6_only_sock(sk);
1267         int sk2_ipv6only = inet_v6_ipv6only(sk2);
1268         int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1269         int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1270
1271         if (!sk2_rcv_saddr && !sk_ipv6only)
1272                 return 1;
1273
1274         if (addr_type2 == IPV6_ADDR_ANY &&
1275             !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1276                 return 1;
1277
1278         if (addr_type == IPV6_ADDR_ANY &&
1279             !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1280                 return 1;
1281
1282         if (sk2_rcv_saddr6 &&
1283             ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1284                 return 1;
1285
1286         if (addr_type == IPV6_ADDR_MAPPED &&
1287             !sk2_ipv6only &&
1288             (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1289                 return 1;
1290
1291         return 0;
1292 }
1293
1294 /* Gets referenced address, destroys ifaddr */
1295
1296 static void addrconf_dad_stop(struct inet6_ifaddr *ifp)
1297 {
1298         if (ifp->flags&IFA_F_PERMANENT) {
1299                 spin_lock_bh(&ifp->lock);
1300                 addrconf_del_timer(ifp);
1301                 ifp->flags |= IFA_F_TENTATIVE;
1302                 spin_unlock_bh(&ifp->lock);
1303                 in6_ifa_put(ifp);
1304 #ifdef CONFIG_IPV6_PRIVACY
1305         } else if (ifp->flags&IFA_F_TEMPORARY) {
1306                 struct inet6_ifaddr *ifpub;
1307                 spin_lock_bh(&ifp->lock);
1308                 ifpub = ifp->ifpub;
1309                 if (ifpub) {
1310                         in6_ifa_hold(ifpub);
1311                         spin_unlock_bh(&ifp->lock);
1312                         ipv6_create_tempaddr(ifpub, ifp);
1313                         in6_ifa_put(ifpub);
1314                 } else {
1315                         spin_unlock_bh(&ifp->lock);
1316                 }
1317                 ipv6_del_addr(ifp);
1318 #endif
1319         } else
1320                 ipv6_del_addr(ifp);
1321 }
1322
1323 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1324 {
1325         if (net_ratelimit())
1326                 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1327         addrconf_dad_stop(ifp);
1328 }
1329
1330 /* Join to solicited addr multicast group. */
1331
1332 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1333 {
1334         struct in6_addr maddr;
1335
1336         if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1337                 return;
1338
1339         addrconf_addr_solict_mult(addr, &maddr);
1340         ipv6_dev_mc_inc(dev, &maddr);
1341 }
1342
1343 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1344 {
1345         struct in6_addr maddr;
1346
1347         if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1348                 return;
1349
1350         addrconf_addr_solict_mult(addr, &maddr);
1351         __ipv6_dev_mc_dec(idev, &maddr);
1352 }
1353
1354 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1355 {
1356         struct in6_addr addr;
1357         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1358         if (ipv6_addr_any(&addr))
1359                 return;
1360         ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1361 }
1362
1363 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1364 {
1365         struct in6_addr addr;
1366         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1367         if (ipv6_addr_any(&addr))
1368                 return;
1369         __ipv6_dev_ac_dec(ifp->idev, &addr);
1370 }
1371
1372 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1373 {
1374         if (dev->addr_len != ETH_ALEN)
1375                 return -1;
1376         memcpy(eui, dev->dev_addr, 3);
1377         memcpy(eui + 5, dev->dev_addr + 3, 3);
1378
1379         /*
1380          * The zSeries OSA network cards can be shared among various
1381          * OS instances, but the OSA cards have only one MAC address.
1382          * This leads to duplicate address conflicts in conjunction
1383          * with IPv6 if more than one instance uses the same card.
1384          *
1385          * The driver for these cards can deliver a unique 16-bit
1386          * identifier for each instance sharing the same card.  It is
1387          * placed instead of 0xFFFE in the interface identifier.  The
1388          * "u" bit of the interface identifier is not inverted in this
1389          * case.  Hence the resulting interface identifier has local
1390          * scope according to RFC2373.
1391          */
1392         if (dev->dev_id) {
1393                 eui[3] = (dev->dev_id >> 8) & 0xFF;
1394                 eui[4] = dev->dev_id & 0xFF;
1395         } else {
1396                 eui[3] = 0xFF;
1397                 eui[4] = 0xFE;
1398                 eui[0] ^= 2;
1399         }
1400         return 0;
1401 }
1402
1403 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1404 {
1405         /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1406         if (dev->addr_len != ARCNET_ALEN)
1407                 return -1;
1408         memset(eui, 0, 7);
1409         eui[7] = *(u8*)dev->dev_addr;
1410         return 0;
1411 }
1412
1413 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1414 {
1415         if (dev->addr_len != INFINIBAND_ALEN)
1416                 return -1;
1417         memcpy(eui, dev->dev_addr + 12, 8);
1418         eui[0] |= 2;
1419         return 0;
1420 }
1421
1422 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1423 {
1424         switch (dev->type) {
1425         case ARPHRD_ETHER:
1426         case ARPHRD_FDDI:
1427         case ARPHRD_IEEE802_TR:
1428                 return addrconf_ifid_eui48(eui, dev);
1429         case ARPHRD_ARCNET:
1430                 return addrconf_ifid_arcnet(eui, dev);
1431         case ARPHRD_INFINIBAND:
1432                 return addrconf_ifid_infiniband(eui, dev);
1433         case ARPHRD_SIT:
1434                 if (dev->priv_flags & IFF_ISATAP)
1435                         return ipv6_isatap_eui64(eui, *(__be32 *)dev->dev_addr);
1436         }
1437         return -1;
1438 }
1439
1440 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1441 {
1442         int err = -1;
1443         struct inet6_ifaddr *ifp;
1444
1445         read_lock_bh(&idev->lock);
1446         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1447                 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1448                         memcpy(eui, ifp->addr.s6_addr+8, 8);
1449                         err = 0;
1450                         break;
1451                 }
1452         }
1453         read_unlock_bh(&idev->lock);
1454         return err;
1455 }
1456
1457 #ifdef CONFIG_IPV6_PRIVACY
1458 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1459 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1460 {
1461 regen:
1462         get_random_bytes(idev->rndid, sizeof(idev->rndid));
1463         idev->rndid[0] &= ~0x02;
1464
1465         /*
1466          * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1467          * check if generated address is not inappropriate
1468          *
1469          *  - Reserved subnet anycast (RFC 2526)
1470          *      11111101 11....11 1xxxxxxx
1471          *  - ISATAP (RFC4214) 6.1
1472          *      00-00-5E-FE-xx-xx-xx-xx
1473          *  - value 0
1474          *  - XXX: already assigned to an address on the device
1475          */
1476         if (idev->rndid[0] == 0xfd &&
1477             (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1478             (idev->rndid[7]&0x80))
1479                 goto regen;
1480         if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1481                 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1482                         goto regen;
1483                 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1484                         goto regen;
1485         }
1486
1487         return 0;
1488 }
1489
1490 static void ipv6_regen_rndid(unsigned long data)
1491 {
1492         struct inet6_dev *idev = (struct inet6_dev *) data;
1493         unsigned long expires;
1494
1495         rcu_read_lock_bh();
1496         write_lock_bh(&idev->lock);
1497
1498         if (idev->dead)
1499                 goto out;
1500
1501         if (__ipv6_regen_rndid(idev) < 0)
1502                 goto out;
1503
1504         expires = jiffies +
1505                 idev->cnf.temp_prefered_lft * HZ -
1506                 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1507         if (time_before(expires, jiffies)) {
1508                 printk(KERN_WARNING
1509                         "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1510                         idev->dev->name);
1511                 goto out;
1512         }
1513
1514         if (!mod_timer(&idev->regen_timer, expires))
1515                 in6_dev_hold(idev);
1516
1517 out:
1518         write_unlock_bh(&idev->lock);
1519         rcu_read_unlock_bh();
1520         in6_dev_put(idev);
1521 }
1522
1523 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1524         int ret = 0;
1525
1526         if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1527                 ret = __ipv6_regen_rndid(idev);
1528         return ret;
1529 }
1530 #endif
1531
1532 /*
1533  *      Add prefix route.
1534  */
1535
1536 static void
1537 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1538                       unsigned long expires, u32 flags)
1539 {
1540         struct fib6_config cfg = {
1541                 .fc_table = RT6_TABLE_PREFIX,
1542                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1543                 .fc_ifindex = dev->ifindex,
1544                 .fc_expires = expires,
1545                 .fc_dst_len = plen,
1546                 .fc_flags = RTF_UP | flags,
1547         };
1548
1549         ipv6_addr_copy(&cfg.fc_dst, pfx);
1550
1551         /* Prevent useless cloning on PtP SIT.
1552            This thing is done here expecting that the whole
1553            class of non-broadcast devices need not cloning.
1554          */
1555 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1556         if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1557                 cfg.fc_flags |= RTF_NONEXTHOP;
1558 #endif
1559
1560         ip6_route_add(&cfg);
1561 }
1562
1563 /* Create "default" multicast route to the interface */
1564
1565 static void addrconf_add_mroute(struct net_device *dev)
1566 {
1567         struct fib6_config cfg = {
1568                 .fc_table = RT6_TABLE_LOCAL,
1569                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1570                 .fc_ifindex = dev->ifindex,
1571                 .fc_dst_len = 8,
1572                 .fc_flags = RTF_UP,
1573         };
1574
1575         ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1576
1577         ip6_route_add(&cfg);
1578 }
1579
1580 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1581 static void sit_route_add(struct net_device *dev)
1582 {
1583         struct fib6_config cfg = {
1584                 .fc_table = RT6_TABLE_MAIN,
1585                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1586                 .fc_ifindex = dev->ifindex,
1587                 .fc_dst_len = 96,
1588                 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1589         };
1590
1591         /* prefix length - 96 bits "::d.d.d.d" */
1592         ip6_route_add(&cfg);
1593 }
1594 #endif
1595
1596 static void addrconf_add_lroute(struct net_device *dev)
1597 {
1598         struct in6_addr addr;
1599
1600         ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
1601         addrconf_prefix_route(&addr, 64, dev, 0, 0);
1602 }
1603
1604 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1605 {
1606         struct inet6_dev *idev;
1607
1608         ASSERT_RTNL();
1609
1610         if ((idev = ipv6_find_idev(dev)) == NULL)
1611                 return NULL;
1612
1613         /* Add default multicast route */
1614         addrconf_add_mroute(dev);
1615
1616         /* Add link local route */
1617         addrconf_add_lroute(dev);
1618         return idev;
1619 }
1620
1621 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1622 {
1623         struct prefix_info *pinfo;
1624         __u32 valid_lft;
1625         __u32 prefered_lft;
1626         int addr_type;
1627         unsigned long rt_expires;
1628         struct inet6_dev *in6_dev;
1629
1630         pinfo = (struct prefix_info *) opt;
1631
1632         if (len < sizeof(struct prefix_info)) {
1633                 ADBG(("addrconf: prefix option too short\n"));
1634                 return;
1635         }
1636
1637         /*
1638          *      Validation checks ([ADDRCONF], page 19)
1639          */
1640
1641         addr_type = ipv6_addr_type(&pinfo->prefix);
1642
1643         if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1644                 return;
1645
1646         valid_lft = ntohl(pinfo->valid);
1647         prefered_lft = ntohl(pinfo->prefered);
1648
1649         if (prefered_lft > valid_lft) {
1650                 if (net_ratelimit())
1651                         printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1652                 return;
1653         }
1654
1655         in6_dev = in6_dev_get(dev);
1656
1657         if (in6_dev == NULL) {
1658                 if (net_ratelimit())
1659                         printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1660                 return;
1661         }
1662
1663         /*
1664          *      Two things going on here:
1665          *      1) Add routes for on-link prefixes
1666          *      2) Configure prefixes with the auto flag set
1667          */
1668
1669         /* Avoid arithmetic overflow. Really, we could
1670            save rt_expires in seconds, likely valid_lft,
1671            but it would require division in fib gc, that it
1672            not good.
1673          */
1674         if (valid_lft >= 0x7FFFFFFF/HZ)
1675                 rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ);
1676         else
1677                 rt_expires = valid_lft * HZ;
1678
1679         /*
1680          * We convert this (in jiffies) to clock_t later.
1681          * Avoid arithmetic overflow there as well.
1682          * Overflow can happen only if HZ < USER_HZ.
1683          */
1684         if (HZ < USER_HZ && rt_expires > 0x7FFFFFFF / USER_HZ)
1685                 rt_expires = 0x7FFFFFFF / USER_HZ;
1686
1687         if (pinfo->onlink) {
1688                 struct rt6_info *rt;
1689                 rt = rt6_lookup(&pinfo->prefix, NULL, dev->ifindex, 1);
1690
1691                 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
1692                         if (rt->rt6i_flags&RTF_EXPIRES) {
1693                                 if (valid_lft == 0) {
1694                                         ip6_del_rt(rt);
1695                                         rt = NULL;
1696                                 } else {
1697                                         rt->rt6i_expires = jiffies + rt_expires;
1698                                 }
1699                         }
1700                 } else if (valid_lft) {
1701                         addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1702                                               dev, jiffies_to_clock_t(rt_expires), RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT);
1703                 }
1704                 if (rt)
1705                         dst_release(&rt->u.dst);
1706         }
1707
1708         /* Try to figure out our local address for this prefix */
1709
1710         if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1711                 struct inet6_ifaddr * ifp;
1712                 struct in6_addr addr;
1713                 int create = 0, update_lft = 0;
1714
1715                 if (pinfo->prefix_len == 64) {
1716                         memcpy(&addr, &pinfo->prefix, 8);
1717                         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1718                             ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1719                                 in6_dev_put(in6_dev);
1720                                 return;
1721                         }
1722                         goto ok;
1723                 }
1724                 if (net_ratelimit())
1725                         printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1726                                pinfo->prefix_len);
1727                 in6_dev_put(in6_dev);
1728                 return;
1729
1730 ok:
1731
1732                 ifp = ipv6_get_ifaddr(&addr, dev, 1);
1733
1734                 if (ifp == NULL && valid_lft) {
1735                         int max_addresses = in6_dev->cnf.max_addresses;
1736                         u32 addr_flags = 0;
1737
1738 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1739                         if (in6_dev->cnf.optimistic_dad &&
1740                             !ipv6_devconf.forwarding)
1741                                 addr_flags = IFA_F_OPTIMISTIC;
1742 #endif
1743
1744                         /* Do not allow to create too much of autoconfigured
1745                          * addresses; this would be too easy way to crash kernel.
1746                          */
1747                         if (!max_addresses ||
1748                             ipv6_count_addresses(in6_dev) < max_addresses)
1749                                 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1750                                                     addr_type&IPV6_ADDR_SCOPE_MASK,
1751                                                     addr_flags);
1752
1753                         if (!ifp || IS_ERR(ifp)) {
1754                                 in6_dev_put(in6_dev);
1755                                 return;
1756                         }
1757
1758                         update_lft = create = 1;
1759                         ifp->cstamp = jiffies;
1760                         addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1761                 }
1762
1763                 if (ifp) {
1764                         int flags;
1765                         unsigned long now;
1766 #ifdef CONFIG_IPV6_PRIVACY
1767                         struct inet6_ifaddr *ift;
1768 #endif
1769                         u32 stored_lft;
1770
1771                         /* update lifetime (RFC2462 5.5.3 e) */
1772                         spin_lock(&ifp->lock);
1773                         now = jiffies;
1774                         if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1775                                 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1776                         else
1777                                 stored_lft = 0;
1778                         if (!update_lft && stored_lft) {
1779                                 if (valid_lft > MIN_VALID_LIFETIME ||
1780                                     valid_lft > stored_lft)
1781                                         update_lft = 1;
1782                                 else if (stored_lft <= MIN_VALID_LIFETIME) {
1783                                         /* valid_lft <= stored_lft is always true */
1784                                         /* XXX: IPsec */
1785                                         update_lft = 0;
1786                                 } else {
1787                                         valid_lft = MIN_VALID_LIFETIME;
1788                                         if (valid_lft < prefered_lft)
1789                                                 prefered_lft = valid_lft;
1790                                         update_lft = 1;
1791                                 }
1792                         }
1793
1794                         if (update_lft) {
1795                                 ifp->valid_lft = valid_lft;
1796                                 ifp->prefered_lft = prefered_lft;
1797                                 ifp->tstamp = now;
1798                                 flags = ifp->flags;
1799                                 ifp->flags &= ~IFA_F_DEPRECATED;
1800                                 spin_unlock(&ifp->lock);
1801
1802                                 if (!(flags&IFA_F_TENTATIVE))
1803                                         ipv6_ifa_notify(0, ifp);
1804                         } else
1805                                 spin_unlock(&ifp->lock);
1806
1807 #ifdef CONFIG_IPV6_PRIVACY
1808                         read_lock_bh(&in6_dev->lock);
1809                         /* update all temporary addresses in the list */
1810                         for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1811                                 /*
1812                                  * When adjusting the lifetimes of an existing
1813                                  * temporary address, only lower the lifetimes.
1814                                  * Implementations must not increase the
1815                                  * lifetimes of an existing temporary address
1816                                  * when processing a Prefix Information Option.
1817                                  */
1818                                 spin_lock(&ift->lock);
1819                                 flags = ift->flags;
1820                                 if (ift->valid_lft > valid_lft &&
1821                                     ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1822                                         ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1823                                 if (ift->prefered_lft > prefered_lft &&
1824                                     ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1825                                         ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1826                                 spin_unlock(&ift->lock);
1827                                 if (!(flags&IFA_F_TENTATIVE))
1828                                         ipv6_ifa_notify(0, ift);
1829                         }
1830
1831                         if (create && in6_dev->cnf.use_tempaddr > 0) {
1832                                 /*
1833                                  * When a new public address is created as described in [ADDRCONF],
1834                                  * also create a new temporary address.
1835                                  */
1836                                 read_unlock_bh(&in6_dev->lock);
1837                                 ipv6_create_tempaddr(ifp, NULL);
1838                         } else {
1839                                 read_unlock_bh(&in6_dev->lock);
1840                         }
1841 #endif
1842                         in6_ifa_put(ifp);
1843                         addrconf_verify(0);
1844                 }
1845         }
1846         inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
1847         in6_dev_put(in6_dev);
1848 }
1849
1850 /*
1851  *      Set destination address.
1852  *      Special case for SIT interfaces where we create a new "virtual"
1853  *      device.
1854  */
1855 int addrconf_set_dstaddr(void __user *arg)
1856 {
1857         struct in6_ifreq ireq;
1858         struct net_device *dev;
1859         int err = -EINVAL;
1860
1861         rtnl_lock();
1862
1863         err = -EFAULT;
1864         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1865                 goto err_exit;
1866
1867         dev = __dev_get_by_index(&init_net, ireq.ifr6_ifindex);
1868
1869         err = -ENODEV;
1870         if (dev == NULL)
1871                 goto err_exit;
1872
1873 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1874         if (dev->type == ARPHRD_SIT) {
1875                 struct ifreq ifr;
1876                 mm_segment_t    oldfs;
1877                 struct ip_tunnel_parm p;
1878
1879                 err = -EADDRNOTAVAIL;
1880                 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
1881                         goto err_exit;
1882
1883                 memset(&p, 0, sizeof(p));
1884                 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
1885                 p.iph.saddr = 0;
1886                 p.iph.version = 4;
1887                 p.iph.ihl = 5;
1888                 p.iph.protocol = IPPROTO_IPV6;
1889                 p.iph.ttl = 64;
1890                 ifr.ifr_ifru.ifru_data = (void __user *)&p;
1891
1892                 oldfs = get_fs(); set_fs(KERNEL_DS);
1893                 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
1894                 set_fs(oldfs);
1895
1896                 if (err == 0) {
1897                         err = -ENOBUFS;
1898                         if ((dev = __dev_get_by_name(&init_net, p.name)) == NULL)
1899                                 goto err_exit;
1900                         err = dev_open(dev);
1901                 }
1902         }
1903 #endif
1904
1905 err_exit:
1906         rtnl_unlock();
1907         return err;
1908 }
1909
1910 /*
1911  *      Manual configuration of address on an interface
1912  */
1913 static int inet6_addr_add(int ifindex, struct in6_addr *pfx, int plen,
1914                           __u8 ifa_flags, __u32 prefered_lft, __u32 valid_lft)
1915 {
1916         struct inet6_ifaddr *ifp;
1917         struct inet6_dev *idev;
1918         struct net_device *dev;
1919         int scope;
1920         u32 flags = RTF_EXPIRES;
1921
1922         ASSERT_RTNL();
1923
1924         /* check the lifetime */
1925         if (!valid_lft || prefered_lft > valid_lft)
1926                 return -EINVAL;
1927
1928         if ((dev = __dev_get_by_index(&init_net, ifindex)) == NULL)
1929                 return -ENODEV;
1930
1931         if ((idev = addrconf_add_dev(dev)) == NULL)
1932                 return -ENOBUFS;
1933
1934         scope = ipv6_addr_scope(pfx);
1935
1936         if (valid_lft == INFINITY_LIFE_TIME) {
1937                 ifa_flags |= IFA_F_PERMANENT;
1938                 flags = 0;
1939         } else if (valid_lft >= 0x7FFFFFFF/HZ)
1940                 valid_lft = 0x7FFFFFFF/HZ;
1941
1942         if (prefered_lft == 0)
1943                 ifa_flags |= IFA_F_DEPRECATED;
1944         else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
1945                  (prefered_lft != INFINITY_LIFE_TIME))
1946                 prefered_lft = 0x7FFFFFFF/HZ;
1947
1948         ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
1949
1950         if (!IS_ERR(ifp)) {
1951                 spin_lock_bh(&ifp->lock);
1952                 ifp->valid_lft = valid_lft;
1953                 ifp->prefered_lft = prefered_lft;
1954                 ifp->tstamp = jiffies;
1955                 spin_unlock_bh(&ifp->lock);
1956
1957                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
1958                                       jiffies_to_clock_t(valid_lft * HZ), flags);
1959                 /*
1960                  * Note that section 3.1 of RFC 4429 indicates
1961                  * that the Optimistic flag should not be set for
1962                  * manually configured addresses
1963                  */
1964                 addrconf_dad_start(ifp, 0);
1965                 in6_ifa_put(ifp);
1966                 addrconf_verify(0);
1967                 return 0;
1968         }
1969
1970         return PTR_ERR(ifp);
1971 }
1972
1973 static int inet6_addr_del(int ifindex, struct in6_addr *pfx, int plen)
1974 {
1975         struct inet6_ifaddr *ifp;
1976         struct inet6_dev *idev;
1977         struct net_device *dev;
1978
1979         if ((dev = __dev_get_by_index(&init_net, ifindex)) == NULL)
1980                 return -ENODEV;
1981
1982         if ((idev = __in6_dev_get(dev)) == NULL)
1983                 return -ENXIO;
1984
1985         read_lock_bh(&idev->lock);
1986         for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
1987                 if (ifp->prefix_len == plen &&
1988                     ipv6_addr_equal(pfx, &ifp->addr)) {
1989                         in6_ifa_hold(ifp);
1990                         read_unlock_bh(&idev->lock);
1991
1992                         ipv6_del_addr(ifp);
1993
1994                         /* If the last address is deleted administratively,
1995                            disable IPv6 on this interface.
1996                          */
1997                         if (idev->addr_list == NULL)
1998                                 addrconf_ifdown(idev->dev, 1);
1999                         return 0;
2000                 }
2001         }
2002         read_unlock_bh(&idev->lock);
2003         return -EADDRNOTAVAIL;
2004 }
2005
2006
2007 int addrconf_add_ifaddr(void __user *arg)
2008 {
2009         struct in6_ifreq ireq;
2010         int err;
2011
2012         if (!capable(CAP_NET_ADMIN))
2013                 return -EPERM;
2014
2015         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2016                 return -EFAULT;
2017
2018         rtnl_lock();
2019         err = inet6_addr_add(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen,
2020                              IFA_F_PERMANENT, INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2021         rtnl_unlock();
2022         return err;
2023 }
2024
2025 int addrconf_del_ifaddr(void __user *arg)
2026 {
2027         struct in6_ifreq ireq;
2028         int err;
2029
2030         if (!capable(CAP_NET_ADMIN))
2031                 return -EPERM;
2032
2033         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2034                 return -EFAULT;
2035
2036         rtnl_lock();
2037         err = inet6_addr_del(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
2038         rtnl_unlock();
2039         return err;
2040 }
2041
2042 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2043 static void sit_add_v4_addrs(struct inet6_dev *idev)
2044 {
2045         struct inet6_ifaddr * ifp;
2046         struct in6_addr addr;
2047         struct net_device *dev;
2048         int scope;
2049
2050         ASSERT_RTNL();
2051
2052         memset(&addr, 0, sizeof(struct in6_addr));
2053         memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2054
2055         if (idev->dev->flags&IFF_POINTOPOINT) {
2056                 addr.s6_addr32[0] = htonl(0xfe800000);
2057                 scope = IFA_LINK;
2058         } else {
2059                 scope = IPV6_ADDR_COMPATv4;
2060         }
2061
2062         if (addr.s6_addr32[3]) {
2063                 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
2064                 if (!IS_ERR(ifp)) {
2065                         spin_lock_bh(&ifp->lock);
2066                         ifp->flags &= ~IFA_F_TENTATIVE;
2067                         spin_unlock_bh(&ifp->lock);
2068                         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2069                         in6_ifa_put(ifp);
2070                 }
2071                 return;
2072         }
2073
2074         for_each_netdev(&init_net, dev) {
2075                 struct in_device * in_dev = __in_dev_get_rtnl(dev);
2076                 if (in_dev && (dev->flags & IFF_UP)) {
2077                         struct in_ifaddr * ifa;
2078
2079                         int flag = scope;
2080
2081                         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2082                                 int plen;
2083
2084                                 addr.s6_addr32[3] = ifa->ifa_local;
2085
2086                                 if (ifa->ifa_scope == RT_SCOPE_LINK)
2087                                         continue;
2088                                 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2089                                         if (idev->dev->flags&IFF_POINTOPOINT)
2090                                                 continue;
2091                                         flag |= IFA_HOST;
2092                                 }
2093                                 if (idev->dev->flags&IFF_POINTOPOINT)
2094                                         plen = 64;
2095                                 else
2096                                         plen = 96;
2097
2098                                 ifp = ipv6_add_addr(idev, &addr, plen, flag,
2099                                                     IFA_F_PERMANENT);
2100                                 if (!IS_ERR(ifp)) {
2101                                         spin_lock_bh(&ifp->lock);
2102                                         ifp->flags &= ~IFA_F_TENTATIVE;
2103                                         spin_unlock_bh(&ifp->lock);
2104                                         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2105                                         in6_ifa_put(ifp);
2106                                 }
2107                         }
2108                 }
2109         }
2110 }
2111 #endif
2112
2113 static void init_loopback(struct net_device *dev)
2114 {
2115         struct inet6_dev  *idev;
2116         struct inet6_ifaddr * ifp;
2117
2118         /* ::1 */
2119
2120         ASSERT_RTNL();
2121
2122         if ((idev = ipv6_find_idev(dev)) == NULL) {
2123                 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2124                 return;
2125         }
2126
2127         ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
2128         if (!IS_ERR(ifp)) {
2129                 spin_lock_bh(&ifp->lock);
2130                 ifp->flags &= ~IFA_F_TENTATIVE;
2131                 spin_unlock_bh(&ifp->lock);
2132                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2133                 in6_ifa_put(ifp);
2134         }
2135 }
2136
2137 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2138 {
2139         struct inet6_ifaddr * ifp;
2140         u32 addr_flags = IFA_F_PERMANENT;
2141
2142 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2143         if (idev->cnf.optimistic_dad &&
2144             !ipv6_devconf.forwarding)
2145                 addr_flags |= IFA_F_OPTIMISTIC;
2146 #endif
2147
2148
2149         ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2150         if (!IS_ERR(ifp)) {
2151                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2152                 addrconf_dad_start(ifp, 0);
2153                 in6_ifa_put(ifp);
2154         }
2155 }
2156
2157 static void addrconf_dev_config(struct net_device *dev)
2158 {
2159         struct in6_addr addr;
2160         struct inet6_dev    * idev;
2161
2162         ASSERT_RTNL();
2163
2164         if ((dev->type != ARPHRD_ETHER) &&
2165             (dev->type != ARPHRD_FDDI) &&
2166             (dev->type != ARPHRD_IEEE802_TR) &&
2167             (dev->type != ARPHRD_ARCNET) &&
2168             (dev->type != ARPHRD_INFINIBAND)) {
2169                 /* Alas, we support only Ethernet autoconfiguration. */
2170                 return;
2171         }
2172
2173         idev = addrconf_add_dev(dev);
2174         if (idev == NULL)
2175                 return;
2176
2177         memset(&addr, 0, sizeof(struct in6_addr));
2178         addr.s6_addr32[0] = htonl(0xFE800000);
2179
2180         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2181                 addrconf_add_linklocal(idev, &addr);
2182 }
2183
2184 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2185 static void addrconf_sit_config(struct net_device *dev)
2186 {
2187         struct inet6_dev *idev;
2188
2189         ASSERT_RTNL();
2190
2191         /*
2192          * Configure the tunnel with one of our IPv4
2193          * addresses... we should configure all of
2194          * our v4 addrs in the tunnel
2195          */
2196
2197         if ((idev = ipv6_find_idev(dev)) == NULL) {
2198                 printk(KERN_DEBUG "init sit: add_dev failed\n");
2199                 return;
2200         }
2201
2202         if (dev->priv_flags & IFF_ISATAP) {
2203                 struct in6_addr addr;
2204
2205                 ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
2206                 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2207                 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2208                         addrconf_add_linklocal(idev, &addr);
2209                 return;
2210         }
2211
2212         sit_add_v4_addrs(idev);
2213
2214         if (dev->flags&IFF_POINTOPOINT) {
2215                 addrconf_add_mroute(dev);
2216                 addrconf_add_lroute(dev);
2217         } else
2218                 sit_route_add(dev);
2219 }
2220 #endif
2221
2222 static inline int
2223 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2224 {
2225         struct in6_addr lladdr;
2226
2227         if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2228                 addrconf_add_linklocal(idev, &lladdr);
2229                 return 0;
2230         }
2231         return -1;
2232 }
2233
2234 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2235 {
2236         struct net_device *link_dev;
2237
2238         /* first try to inherit the link-local address from the link device */
2239         if (idev->dev->iflink &&
2240             (link_dev = __dev_get_by_index(&init_net, idev->dev->iflink))) {
2241                 if (!ipv6_inherit_linklocal(idev, link_dev))
2242                         return;
2243         }
2244         /* then try to inherit it from any device */
2245         for_each_netdev(&init_net, link_dev) {
2246                 if (!ipv6_inherit_linklocal(idev, link_dev))
2247                         return;
2248         }
2249         printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2250 }
2251
2252 /*
2253  * Autoconfigure tunnel with a link-local address so routing protocols,
2254  * DHCPv6, MLD etc. can be run over the virtual link
2255  */
2256
2257 static void addrconf_ip6_tnl_config(struct net_device *dev)
2258 {
2259         struct inet6_dev *idev;
2260
2261         ASSERT_RTNL();
2262
2263         if ((idev = addrconf_add_dev(dev)) == NULL) {
2264                 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2265                 return;
2266         }
2267         ip6_tnl_add_linklocal(idev);
2268 }
2269
2270 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2271                            void * data)
2272 {
2273         struct net_device *dev = (struct net_device *) data;
2274         struct inet6_dev *idev = __in6_dev_get(dev);
2275         int run_pending = 0;
2276         int err;
2277
2278         if (dev->nd_net != &init_net)
2279                 return NOTIFY_DONE;
2280
2281         switch(event) {
2282         case NETDEV_REGISTER:
2283                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2284                         idev = ipv6_add_dev(dev);
2285                         if (!idev)
2286                                 return notifier_from_errno(-ENOMEM);
2287                 }
2288                 break;
2289         case NETDEV_UP:
2290         case NETDEV_CHANGE:
2291                 if (dev->flags & IFF_SLAVE)
2292                         break;
2293
2294                 if (event == NETDEV_UP) {
2295                         if (!addrconf_qdisc_ok(dev)) {
2296                                 /* device is not ready yet. */
2297                                 printk(KERN_INFO
2298                                         "ADDRCONF(NETDEV_UP): %s: "
2299                                         "link is not ready\n",
2300                                         dev->name);
2301                                 break;
2302                         }
2303
2304                         if (!idev && dev->mtu >= IPV6_MIN_MTU)
2305                                 idev = ipv6_add_dev(dev);
2306
2307                         if (idev)
2308                                 idev->if_flags |= IF_READY;
2309                 } else {
2310                         if (!addrconf_qdisc_ok(dev)) {
2311                                 /* device is still not ready. */
2312                                 break;
2313                         }
2314
2315                         if (idev) {
2316                                 if (idev->if_flags & IF_READY) {
2317                                         /* device is already configured. */
2318                                         break;
2319                                 }
2320                                 idev->if_flags |= IF_READY;
2321                         }
2322
2323                         printk(KERN_INFO
2324                                         "ADDRCONF(NETDEV_CHANGE): %s: "
2325                                         "link becomes ready\n",
2326                                         dev->name);
2327
2328                         run_pending = 1;
2329                 }
2330
2331                 switch(dev->type) {
2332 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2333                 case ARPHRD_SIT:
2334                         addrconf_sit_config(dev);
2335                         break;
2336 #endif
2337                 case ARPHRD_TUNNEL6:
2338                         addrconf_ip6_tnl_config(dev);
2339                         break;
2340                 case ARPHRD_LOOPBACK:
2341                         init_loopback(dev);
2342                         break;
2343
2344                 default:
2345                         addrconf_dev_config(dev);
2346                         break;
2347                 }
2348                 if (idev) {
2349                         if (run_pending)
2350                                 addrconf_dad_run(idev);
2351
2352                         /* If the MTU changed during the interface down, when the
2353                            interface up, the changed MTU must be reflected in the
2354                            idev as well as routers.
2355                          */
2356                         if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2357                                 rt6_mtu_change(dev, dev->mtu);
2358                                 idev->cnf.mtu6 = dev->mtu;
2359                         }
2360                         idev->tstamp = jiffies;
2361                         inet6_ifinfo_notify(RTM_NEWLINK, idev);
2362                         /* If the changed mtu during down is lower than IPV6_MIN_MTU
2363                            stop IPv6 on this interface.
2364                          */
2365                         if (dev->mtu < IPV6_MIN_MTU)
2366                                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2367                 }
2368                 break;
2369
2370         case NETDEV_CHANGEMTU:
2371                 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2372                         rt6_mtu_change(dev, dev->mtu);
2373                         idev->cnf.mtu6 = dev->mtu;
2374                         break;
2375                 }
2376
2377                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2378                         idev = ipv6_add_dev(dev);
2379                         if (idev)
2380                                 break;
2381                 }
2382
2383                 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2384
2385         case NETDEV_DOWN:
2386         case NETDEV_UNREGISTER:
2387                 /*
2388                  *      Remove all addresses from this interface.
2389                  */
2390                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2391                 break;
2392
2393         case NETDEV_CHANGENAME:
2394                 if (idev) {
2395                         snmp6_unregister_dev(idev);
2396                         addrconf_sysctl_unregister(idev);
2397                         addrconf_sysctl_register(idev);
2398                         err = snmp6_register_dev(idev);
2399                         if (err)
2400                                 return notifier_from_errno(err);
2401                 }
2402                 break;
2403         }
2404
2405         return NOTIFY_OK;
2406 }
2407
2408 /*
2409  *      addrconf module should be notified of a device going up
2410  */
2411 static struct notifier_block ipv6_dev_notf = {
2412         .notifier_call = addrconf_notify,
2413         .priority = 0
2414 };
2415
2416 static int addrconf_ifdown(struct net_device *dev, int how)
2417 {
2418         struct inet6_dev *idev;
2419         struct inet6_ifaddr *ifa, **bifa;
2420         int i;
2421
2422         ASSERT_RTNL();
2423
2424         if (dev == init_net.loopback_dev && how == 1)
2425                 how = 0;
2426
2427         rt6_ifdown(dev);
2428         neigh_ifdown(&nd_tbl, dev);
2429
2430         idev = __in6_dev_get(dev);
2431         if (idev == NULL)
2432                 return -ENODEV;
2433
2434         /* Step 1: remove reference to ipv6 device from parent device.
2435                    Do not dev_put!
2436          */
2437         if (how == 1) {
2438                 idev->dead = 1;
2439
2440                 /* protected by rtnl_lock */
2441                 rcu_assign_pointer(dev->ip6_ptr, NULL);
2442
2443                 /* Step 1.5: remove snmp6 entry */
2444                 snmp6_unregister_dev(idev);
2445
2446         }
2447
2448         /* Step 2: clear hash table */
2449         for (i=0; i<IN6_ADDR_HSIZE; i++) {
2450                 bifa = &inet6_addr_lst[i];
2451
2452                 write_lock_bh(&addrconf_hash_lock);
2453                 while ((ifa = *bifa) != NULL) {
2454                         if (ifa->idev == idev) {
2455                                 *bifa = ifa->lst_next;
2456                                 ifa->lst_next = NULL;
2457                                 addrconf_del_timer(ifa);
2458                                 in6_ifa_put(ifa);
2459                                 continue;
2460                         }
2461                         bifa = &ifa->lst_next;
2462                 }
2463                 write_unlock_bh(&addrconf_hash_lock);
2464         }
2465
2466         write_lock_bh(&idev->lock);
2467
2468         /* Step 3: clear flags for stateless addrconf */
2469         if (how != 1)
2470                 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2471
2472         /* Step 4: clear address list */
2473 #ifdef CONFIG_IPV6_PRIVACY
2474         if (how == 1 && del_timer(&idev->regen_timer))
2475                 in6_dev_put(idev);
2476
2477         /* clear tempaddr list */
2478         while ((ifa = idev->tempaddr_list) != NULL) {
2479                 idev->tempaddr_list = ifa->tmp_next;
2480                 ifa->tmp_next = NULL;
2481                 ifa->dead = 1;
2482                 write_unlock_bh(&idev->lock);
2483                 spin_lock_bh(&ifa->lock);
2484
2485                 if (ifa->ifpub) {
2486                         in6_ifa_put(ifa->ifpub);
2487                         ifa->ifpub = NULL;
2488                 }
2489                 spin_unlock_bh(&ifa->lock);
2490                 in6_ifa_put(ifa);
2491                 write_lock_bh(&idev->lock);
2492         }
2493 #endif
2494         while ((ifa = idev->addr_list) != NULL) {
2495                 idev->addr_list = ifa->if_next;
2496                 ifa->if_next = NULL;
2497                 ifa->dead = 1;
2498                 addrconf_del_timer(ifa);
2499                 write_unlock_bh(&idev->lock);
2500
2501                 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2502                 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2503                 in6_ifa_put(ifa);
2504
2505                 write_lock_bh(&idev->lock);
2506         }
2507         write_unlock_bh(&idev->lock);
2508
2509         /* Step 5: Discard multicast list */
2510
2511         if (how == 1)
2512                 ipv6_mc_destroy_dev(idev);
2513         else
2514                 ipv6_mc_down(idev);
2515
2516         idev->tstamp = jiffies;
2517
2518         /* Shot the device (if unregistered) */
2519
2520         if (how == 1) {
2521                 addrconf_sysctl_unregister(idev);
2522                 neigh_parms_release(&nd_tbl, idev->nd_parms);
2523                 neigh_ifdown(&nd_tbl, dev);
2524                 in6_dev_put(idev);
2525         }
2526         return 0;
2527 }
2528
2529 static void addrconf_rs_timer(unsigned long data)
2530 {
2531         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2532
2533         if (ifp->idev->cnf.forwarding)
2534                 goto out;
2535
2536         if (ifp->idev->if_flags & IF_RA_RCVD) {
2537                 /*
2538                  *      Announcement received after solicitation
2539                  *      was sent
2540                  */
2541                 goto out;
2542         }
2543
2544         spin_lock(&ifp->lock);
2545         if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2546                 struct in6_addr all_routers;
2547
2548                 /* The wait after the last probe can be shorter */
2549                 addrconf_mod_timer(ifp, AC_RS,
2550                                    (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2551                                    ifp->idev->cnf.rtr_solicit_delay :
2552                                    ifp->idev->cnf.rtr_solicit_interval);
2553                 spin_unlock(&ifp->lock);
2554
2555                 ipv6_addr_all_routers(&all_routers);
2556
2557                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2558         } else {
2559                 spin_unlock(&ifp->lock);
2560                 /*
2561                  * Note: we do not support deprecated "all on-link"
2562                  * assumption any longer.
2563                  */
2564                 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2565                        ifp->idev->dev->name);
2566         }
2567
2568 out:
2569         in6_ifa_put(ifp);
2570 }
2571
2572 /*
2573  *      Duplicate Address Detection
2574  */
2575 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2576 {
2577         unsigned long rand_num;
2578         struct inet6_dev *idev = ifp->idev;
2579
2580         if (ifp->flags & IFA_F_OPTIMISTIC)
2581                 rand_num = 0;
2582         else
2583                 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2584
2585         ifp->probes = idev->cnf.dad_transmits;
2586         addrconf_mod_timer(ifp, AC_DAD, rand_num);
2587 }
2588
2589 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2590 {
2591         struct inet6_dev *idev = ifp->idev;
2592         struct net_device *dev = idev->dev;
2593
2594         addrconf_join_solict(dev, &ifp->addr);
2595
2596         net_srandom(ifp->addr.s6_addr32[3]);
2597
2598         read_lock_bh(&idev->lock);
2599         if (ifp->dead)
2600                 goto out;
2601         spin_lock_bh(&ifp->lock);
2602
2603         if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2604             !(ifp->flags&IFA_F_TENTATIVE) ||
2605             ifp->flags & IFA_F_NODAD) {
2606                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
2607                 spin_unlock_bh(&ifp->lock);
2608                 read_unlock_bh(&idev->lock);
2609
2610                 addrconf_dad_completed(ifp);
2611                 return;
2612         }
2613
2614         if (!(idev->if_flags & IF_READY)) {
2615                 spin_unlock_bh(&ifp->lock);
2616                 read_unlock_bh(&idev->lock);
2617                 /*
2618                  * If the defice is not ready:
2619                  * - keep it tentative if it is a permanent address.
2620                  * - otherwise, kill it.
2621                  */
2622                 in6_ifa_hold(ifp);
2623                 addrconf_dad_stop(ifp);
2624                 return;
2625         }
2626
2627         /*
2628          * Optimistic nodes can start receiving
2629          * Frames right away
2630          */
2631         if(ifp->flags & IFA_F_OPTIMISTIC)
2632                 ip6_ins_rt(ifp->rt);
2633
2634         addrconf_dad_kick(ifp);
2635         spin_unlock_bh(&ifp->lock);
2636 out:
2637         read_unlock_bh(&idev->lock);
2638 }
2639
2640 static void addrconf_dad_timer(unsigned long data)
2641 {
2642         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2643         struct inet6_dev *idev = ifp->idev;
2644         struct in6_addr unspec;
2645         struct in6_addr mcaddr;
2646
2647         read_lock_bh(&idev->lock);
2648         if (idev->dead) {
2649                 read_unlock_bh(&idev->lock);
2650                 goto out;
2651         }
2652         spin_lock_bh(&ifp->lock);
2653         if (ifp->probes == 0) {
2654                 /*
2655                  * DAD was successful
2656                  */
2657
2658                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
2659                 spin_unlock_bh(&ifp->lock);
2660                 read_unlock_bh(&idev->lock);
2661
2662                 addrconf_dad_completed(ifp);
2663
2664                 goto out;
2665         }
2666
2667         ifp->probes--;
2668         addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2669         spin_unlock_bh(&ifp->lock);
2670         read_unlock_bh(&idev->lock);
2671
2672         /* send a neighbour solicitation for our addr */
2673         memset(&unspec, 0, sizeof(unspec));
2674         addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2675         ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec);
2676 out:
2677         in6_ifa_put(ifp);
2678 }
2679
2680 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2681 {
2682         struct net_device *     dev = ifp->idev->dev;
2683
2684         /*
2685          *      Configure the address for reception. Now it is valid.
2686          */
2687
2688         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2689
2690         /* If added prefix is link local and forwarding is off,
2691            start sending router solicitations.
2692          */
2693
2694         if (ifp->idev->cnf.forwarding == 0 &&
2695             ifp->idev->cnf.rtr_solicits > 0 &&
2696             (dev->flags&IFF_LOOPBACK) == 0 &&
2697             (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2698                 struct in6_addr all_routers;
2699
2700                 ipv6_addr_all_routers(&all_routers);
2701
2702                 /*
2703                  *      If a host as already performed a random delay
2704                  *      [...] as part of DAD [...] there is no need
2705                  *      to delay again before sending the first RS
2706                  */
2707                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2708
2709                 spin_lock_bh(&ifp->lock);
2710                 ifp->probes = 1;
2711                 ifp->idev->if_flags |= IF_RS_SENT;
2712                 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2713                 spin_unlock_bh(&ifp->lock);
2714         }
2715 }
2716
2717 static void addrconf_dad_run(struct inet6_dev *idev) {
2718         struct inet6_ifaddr *ifp;
2719
2720         read_lock_bh(&idev->lock);
2721         for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2722                 spin_lock_bh(&ifp->lock);
2723                 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2724                         spin_unlock_bh(&ifp->lock);
2725                         continue;
2726                 }
2727                 spin_unlock_bh(&ifp->lock);
2728                 addrconf_dad_kick(ifp);
2729         }
2730         read_unlock_bh(&idev->lock);
2731 }
2732
2733 #ifdef CONFIG_PROC_FS
2734 struct if6_iter_state {
2735         int bucket;
2736 };
2737
2738 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2739 {
2740         struct inet6_ifaddr *ifa = NULL;
2741         struct if6_iter_state *state = seq->private;
2742
2743         for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2744                 ifa = inet6_addr_lst[state->bucket];
2745                 if (ifa)
2746                         break;
2747         }
2748         return ifa;
2749 }
2750
2751 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2752 {
2753         struct if6_iter_state *state = seq->private;
2754
2755         ifa = ifa->lst_next;
2756 try_again:
2757         if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2758                 ifa = inet6_addr_lst[state->bucket];
2759                 goto try_again;
2760         }
2761         return ifa;
2762 }
2763
2764 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2765 {
2766         struct inet6_ifaddr *ifa = if6_get_first(seq);
2767
2768         if (ifa)
2769                 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2770                         --pos;
2771         return pos ? NULL : ifa;
2772 }
2773
2774 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2775 {
2776         read_lock_bh(&addrconf_hash_lock);
2777         return if6_get_idx(seq, *pos);
2778 }
2779
2780 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2781 {
2782         struct inet6_ifaddr *ifa;
2783
2784         ifa = if6_get_next(seq, v);
2785         ++*pos;
2786         return ifa;
2787 }
2788
2789 static void if6_seq_stop(struct seq_file *seq, void *v)
2790 {
2791         read_unlock_bh(&addrconf_hash_lock);
2792 }
2793
2794 static int if6_seq_show(struct seq_file *seq, void *v)
2795 {
2796         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2797         seq_printf(seq,
2798                    NIP6_SEQFMT " %02x %02x %02x %02x %8s\n",
2799                    NIP6(ifp->addr),
2800                    ifp->idev->dev->ifindex,
2801                    ifp->prefix_len,
2802                    ifp->scope,
2803                    ifp->flags,
2804                    ifp->idev->dev->name);
2805         return 0;
2806 }
2807
2808 static const struct seq_operations if6_seq_ops = {
2809         .start  = if6_seq_start,
2810         .next   = if6_seq_next,
2811         .show   = if6_seq_show,
2812         .stop   = if6_seq_stop,
2813 };
2814
2815 static int if6_seq_open(struct inode *inode, struct file *file)
2816 {
2817         return seq_open_private(file, &if6_seq_ops,
2818                         sizeof(struct if6_iter_state));
2819 }
2820
2821 static const struct file_operations if6_fops = {
2822         .owner          = THIS_MODULE,
2823         .open           = if6_seq_open,
2824         .read           = seq_read,
2825         .llseek         = seq_lseek,
2826         .release        = seq_release_private,
2827 };
2828
2829 int __init if6_proc_init(void)
2830 {
2831         if (!proc_net_fops_create(&init_net, "if_inet6", S_IRUGO, &if6_fops))
2832                 return -ENOMEM;
2833         return 0;
2834 }
2835
2836 void if6_proc_exit(void)
2837 {
2838         proc_net_remove(&init_net, "if_inet6");
2839 }
2840 #endif  /* CONFIG_PROC_FS */
2841
2842 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
2843 /* Check if address is a home address configured on any interface. */
2844 int ipv6_chk_home_addr(struct in6_addr *addr)
2845 {
2846         int ret = 0;
2847         struct inet6_ifaddr * ifp;
2848         u8 hash = ipv6_addr_hash(addr);
2849         read_lock_bh(&addrconf_hash_lock);
2850         for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) {
2851                 if (ipv6_addr_cmp(&ifp->addr, addr) == 0 &&
2852                     (ifp->flags & IFA_F_HOMEADDRESS)) {
2853                         ret = 1;
2854                         break;
2855                 }
2856         }
2857         read_unlock_bh(&addrconf_hash_lock);
2858         return ret;
2859 }
2860 #endif
2861
2862 /*
2863  *      Periodic address status verification
2864  */
2865
2866 static void addrconf_verify(unsigned long foo)
2867 {
2868         struct inet6_ifaddr *ifp;
2869         unsigned long now, next;
2870         int i;
2871
2872         spin_lock_bh(&addrconf_verify_lock);
2873         now = jiffies;
2874         next = now + ADDR_CHECK_FREQUENCY;
2875
2876         del_timer(&addr_chk_timer);
2877
2878         for (i=0; i < IN6_ADDR_HSIZE; i++) {
2879
2880 restart:
2881                 read_lock(&addrconf_hash_lock);
2882                 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
2883                         unsigned long age;
2884 #ifdef CONFIG_IPV6_PRIVACY
2885                         unsigned long regen_advance;
2886 #endif
2887
2888                         if (ifp->flags & IFA_F_PERMANENT)
2889                                 continue;
2890
2891                         spin_lock(&ifp->lock);
2892                         age = (now - ifp->tstamp) / HZ;
2893
2894 #ifdef CONFIG_IPV6_PRIVACY
2895                         regen_advance = ifp->idev->cnf.regen_max_retry *
2896                                         ifp->idev->cnf.dad_transmits *
2897                                         ifp->idev->nd_parms->retrans_time / HZ;
2898 #endif
2899
2900                         if (ifp->valid_lft != INFINITY_LIFE_TIME &&
2901                             age >= ifp->valid_lft) {
2902                                 spin_unlock(&ifp->lock);
2903                                 in6_ifa_hold(ifp);
2904                                 read_unlock(&addrconf_hash_lock);
2905                                 ipv6_del_addr(ifp);
2906                                 goto restart;
2907                         } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
2908                                 spin_unlock(&ifp->lock);
2909                                 continue;
2910                         } else if (age >= ifp->prefered_lft) {
2911                                 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
2912                                 int deprecate = 0;
2913
2914                                 if (!(ifp->flags&IFA_F_DEPRECATED)) {
2915                                         deprecate = 1;
2916                                         ifp->flags |= IFA_F_DEPRECATED;
2917                                 }
2918
2919                                 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
2920                                         next = ifp->tstamp + ifp->valid_lft * HZ;
2921
2922                                 spin_unlock(&ifp->lock);
2923
2924                                 if (deprecate) {
2925                                         in6_ifa_hold(ifp);
2926                                         read_unlock(&addrconf_hash_lock);
2927
2928                                         ipv6_ifa_notify(0, ifp);
2929                                         in6_ifa_put(ifp);
2930                                         goto restart;
2931                                 }
2932 #ifdef CONFIG_IPV6_PRIVACY
2933                         } else if ((ifp->flags&IFA_F_TEMPORARY) &&
2934                                    !(ifp->flags&IFA_F_TENTATIVE)) {
2935                                 if (age >= ifp->prefered_lft - regen_advance) {
2936                                         struct inet6_ifaddr *ifpub = ifp->ifpub;
2937                                         if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2938                                                 next = ifp->tstamp + ifp->prefered_lft * HZ;
2939                                         if (!ifp->regen_count && ifpub) {
2940                                                 ifp->regen_count++;
2941                                                 in6_ifa_hold(ifp);
2942                                                 in6_ifa_hold(ifpub);
2943                                                 spin_unlock(&ifp->lock);
2944                                                 read_unlock(&addrconf_hash_lock);
2945                                                 spin_lock(&ifpub->lock);
2946                                                 ifpub->regen_count = 0;
2947                                                 spin_unlock(&ifpub->lock);
2948                                                 ipv6_create_tempaddr(ifpub, ifp);
2949                                                 in6_ifa_put(ifpub);
2950                                                 in6_ifa_put(ifp);
2951                                                 goto restart;
2952                                         }
2953                                 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
2954                                         next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
2955                                 spin_unlock(&ifp->lock);
2956 #endif
2957                         } else {
2958                                 /* ifp->prefered_lft <= ifp->valid_lft */
2959                                 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2960                                         next = ifp->tstamp + ifp->prefered_lft * HZ;
2961                                 spin_unlock(&ifp->lock);
2962                         }
2963                 }
2964                 read_unlock(&addrconf_hash_lock);
2965         }
2966
2967         addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
2968         add_timer(&addr_chk_timer);
2969         spin_unlock_bh(&addrconf_verify_lock);
2970 }
2971
2972 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
2973 {
2974         struct in6_addr *pfx = NULL;
2975
2976         if (addr)
2977                 pfx = nla_data(addr);
2978
2979         if (local) {
2980                 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
2981                         pfx = NULL;
2982                 else
2983                         pfx = nla_data(local);
2984         }
2985
2986         return pfx;
2987 }
2988
2989 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
2990         [IFA_ADDRESS]           = { .len = sizeof(struct in6_addr) },
2991         [IFA_LOCAL]             = { .len = sizeof(struct in6_addr) },
2992         [IFA_CACHEINFO]         = { .len = sizeof(struct ifa_cacheinfo) },
2993 };
2994
2995 static int
2996 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
2997 {
2998         struct net *net = skb->sk->sk_net;
2999         struct ifaddrmsg *ifm;
3000         struct nlattr *tb[IFA_MAX+1];
3001         struct in6_addr *pfx;
3002         int err;
3003
3004         if (net != &init_net)
3005                 return -EINVAL;
3006
3007         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3008         if (err < 0)
3009                 return err;
3010
3011         ifm = nlmsg_data(nlh);
3012         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3013         if (pfx == NULL)
3014                 return -EINVAL;
3015
3016         return inet6_addr_del(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3017 }
3018
3019 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3020                              u32 prefered_lft, u32 valid_lft)
3021 {
3022         u32 flags = RTF_EXPIRES;
3023
3024         if (!valid_lft || (prefered_lft > valid_lft))
3025                 return -EINVAL;
3026
3027         if (valid_lft == INFINITY_LIFE_TIME) {
3028                 ifa_flags |= IFA_F_PERMANENT;
3029                 flags = 0;
3030         } else if (valid_lft >= 0x7FFFFFFF/HZ)
3031                 valid_lft = 0x7FFFFFFF/HZ;
3032
3033         if (prefered_lft == 0)
3034                 ifa_flags |= IFA_F_DEPRECATED;
3035         else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
3036                  (prefered_lft != INFINITY_LIFE_TIME))
3037                 prefered_lft = 0x7FFFFFFF/HZ;
3038
3039         spin_lock_bh(&ifp->lock);
3040         ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3041         ifp->tstamp = jiffies;
3042         ifp->valid_lft = valid_lft;
3043         ifp->prefered_lft = prefered_lft;
3044
3045         spin_unlock_bh(&ifp->lock);
3046         if (!(ifp->flags&IFA_F_TENTATIVE))
3047                 ipv6_ifa_notify(0, ifp);
3048
3049         addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3050                               jiffies_to_clock_t(valid_lft * HZ), flags);
3051         addrconf_verify(0);
3052
3053         return 0;
3054 }
3055
3056 static int
3057 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3058 {
3059         struct net *net = skb->sk->sk_net;
3060         struct ifaddrmsg *ifm;
3061         struct nlattr *tb[IFA_MAX+1];
3062         struct in6_addr *pfx;
3063         struct inet6_ifaddr *ifa;
3064         struct net_device *dev;
3065         u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3066         u8 ifa_flags;
3067         int err;
3068
3069         if (net != &init_net)
3070                 return -EINVAL;
3071
3072         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3073         if (err < 0)
3074                 return err;
3075
3076         ifm = nlmsg_data(nlh);
3077         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3078         if (pfx == NULL)
3079                 return -EINVAL;
3080
3081         if (tb[IFA_CACHEINFO]) {
3082                 struct ifa_cacheinfo *ci;
3083
3084                 ci = nla_data(tb[IFA_CACHEINFO]);
3085                 valid_lft = ci->ifa_valid;
3086                 preferred_lft = ci->ifa_prefered;
3087         } else {
3088                 preferred_lft = INFINITY_LIFE_TIME;
3089                 valid_lft = INFINITY_LIFE_TIME;
3090         }
3091
3092         dev =  __dev_get_by_index(&init_net, ifm->ifa_index);
3093         if (dev == NULL)
3094                 return -ENODEV;
3095
3096         /* We ignore other flags so far. */
3097         ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3098
3099         ifa = ipv6_get_ifaddr(pfx, dev, 1);
3100         if (ifa == NULL) {
3101                 /*
3102                  * It would be best to check for !NLM_F_CREATE here but
3103                  * userspace alreay relies on not having to provide this.
3104                  */
3105                 return inet6_addr_add(ifm->ifa_index, pfx, ifm->ifa_prefixlen,
3106                                       ifa_flags, preferred_lft, valid_lft);
3107         }
3108
3109         if (nlh->nlmsg_flags & NLM_F_EXCL ||
3110             !(nlh->nlmsg_flags & NLM_F_REPLACE))
3111                 err = -EEXIST;
3112         else
3113                 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3114
3115         in6_ifa_put(ifa);
3116
3117         return err;
3118 }
3119
3120 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3121                           u8 scope, int ifindex)
3122 {
3123         struct ifaddrmsg *ifm;
3124
3125         ifm = nlmsg_data(nlh);
3126         ifm->ifa_family = AF_INET6;
3127         ifm->ifa_prefixlen = prefixlen;
3128         ifm->ifa_flags = flags;
3129         ifm->ifa_scope = scope;
3130         ifm->ifa_index = ifindex;
3131 }
3132
3133 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3134                          unsigned long tstamp, u32 preferred, u32 valid)
3135 {
3136         struct ifa_cacheinfo ci;
3137
3138         ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3139                         + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3140         ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3141                         + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3142         ci.ifa_prefered = preferred;
3143         ci.ifa_valid = valid;
3144
3145         return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3146 }
3147
3148 static inline int rt_scope(int ifa_scope)
3149 {
3150         if (ifa_scope & IFA_HOST)
3151                 return RT_SCOPE_HOST;
3152         else if (ifa_scope & IFA_LINK)
3153                 return RT_SCOPE_LINK;
3154         else if (ifa_scope & IFA_SITE)
3155                 return RT_SCOPE_SITE;
3156         else
3157                 return RT_SCOPE_UNIVERSE;
3158 }
3159
3160 static inline int inet6_ifaddr_msgsize(void)
3161 {
3162         return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3163                + nla_total_size(16) /* IFA_ADDRESS */
3164                + nla_total_size(sizeof(struct ifa_cacheinfo));
3165 }
3166
3167 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3168                              u32 pid, u32 seq, int event, unsigned int flags)
3169 {
3170         struct nlmsghdr  *nlh;
3171         u32 preferred, valid;
3172
3173         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3174         if (nlh == NULL)
3175                 return -EMSGSIZE;
3176
3177         put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3178                       ifa->idev->dev->ifindex);
3179
3180         if (!(ifa->flags&IFA_F_PERMANENT)) {
3181                 preferred = ifa->prefered_lft;
3182                 valid = ifa->valid_lft;
3183                 if (preferred != INFINITY_LIFE_TIME) {
3184                         long tval = (jiffies - ifa->tstamp)/HZ;
3185                         preferred -= tval;
3186                         if (valid != INFINITY_LIFE_TIME)
3187                                 valid -= tval;
3188                 }
3189         } else {
3190                 preferred = INFINITY_LIFE_TIME;
3191                 valid = INFINITY_LIFE_TIME;
3192         }
3193
3194         if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3195             put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3196                 nlmsg_cancel(skb, nlh);
3197                 return -EMSGSIZE;
3198         }
3199
3200         return nlmsg_end(skb, nlh);
3201 }
3202
3203 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3204                                 u32 pid, u32 seq, int event, u16 flags)
3205 {
3206         struct nlmsghdr  *nlh;
3207         u8 scope = RT_SCOPE_UNIVERSE;
3208         int ifindex = ifmca->idev->dev->ifindex;
3209
3210         if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3211                 scope = RT_SCOPE_SITE;
3212
3213         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3214         if (nlh == NULL)
3215                 return -EMSGSIZE;
3216
3217         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3218         if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3219             put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3220                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3221                 nlmsg_cancel(skb, nlh);
3222                 return -EMSGSIZE;
3223         }
3224
3225         return nlmsg_end(skb, nlh);
3226 }
3227
3228 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3229                                 u32 pid, u32 seq, int event, unsigned int flags)
3230 {
3231         struct nlmsghdr  *nlh;
3232         u8 scope = RT_SCOPE_UNIVERSE;
3233         int ifindex = ifaca->aca_idev->dev->ifindex;
3234
3235         if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3236                 scope = RT_SCOPE_SITE;
3237
3238         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3239         if (nlh == NULL)
3240                 return -EMSGSIZE;
3241
3242         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3243         if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3244             put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3245                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3246                 nlmsg_cancel(skb, nlh);
3247                 return -EMSGSIZE;
3248         }
3249
3250         return nlmsg_end(skb, nlh);
3251 }
3252
3253 enum addr_type_t
3254 {
3255         UNICAST_ADDR,
3256         MULTICAST_ADDR,
3257         ANYCAST_ADDR,
3258 };
3259
3260 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3261                            enum addr_type_t type)
3262 {
3263         int idx, ip_idx;
3264         int s_idx, s_ip_idx;
3265         int err = 1;
3266         struct net_device *dev;
3267         struct inet6_dev *idev = NULL;
3268         struct inet6_ifaddr *ifa;
3269         struct ifmcaddr6 *ifmca;
3270         struct ifacaddr6 *ifaca;
3271
3272         s_idx = cb->args[0];
3273         s_ip_idx = ip_idx = cb->args[1];
3274
3275         idx = 0;
3276         for_each_netdev(&init_net, dev) {
3277                 if (idx < s_idx)
3278                         goto cont;
3279                 if (idx > s_idx)
3280                         s_ip_idx = 0;
3281                 ip_idx = 0;
3282                 if ((idev = in6_dev_get(dev)) == NULL)
3283                         goto cont;
3284                 read_lock_bh(&idev->lock);
3285                 switch (type) {
3286                 case UNICAST_ADDR:
3287                         /* unicast address incl. temp addr */
3288                         for (ifa = idev->addr_list; ifa;
3289                              ifa = ifa->if_next, ip_idx++) {
3290                                 if (ip_idx < s_ip_idx)
3291                                         continue;
3292                                 if ((err = inet6_fill_ifaddr(skb, ifa,
3293                                     NETLINK_CB(cb->skb).pid,
3294                                     cb->nlh->nlmsg_seq, RTM_NEWADDR,
3295                                     NLM_F_MULTI)) <= 0)
3296                                         goto done;
3297                         }
3298                         break;
3299                 case MULTICAST_ADDR:
3300                         /* multicast address */
3301                         for (ifmca = idev->mc_list; ifmca;
3302                              ifmca = ifmca->next, ip_idx++) {
3303                                 if (ip_idx < s_ip_idx)
3304                                         continue;
3305                                 if ((err = inet6_fill_ifmcaddr(skb, ifmca,
3306                                     NETLINK_CB(cb->skb).pid,
3307                                     cb->nlh->nlmsg_seq, RTM_GETMULTICAST,
3308                                     NLM_F_MULTI)) <= 0)
3309                                         goto done;
3310                         }
3311                         break;
3312                 case ANYCAST_ADDR:
3313                         /* anycast address */
3314                         for (ifaca = idev->ac_list; ifaca;
3315                              ifaca = ifaca->aca_next, ip_idx++) {
3316                                 if (ip_idx < s_ip_idx)
3317                                         continue;
3318                                 if ((err = inet6_fill_ifacaddr(skb, ifaca,
3319                                     NETLINK_CB(cb->skb).pid,
3320                                     cb->nlh->nlmsg_seq, RTM_GETANYCAST,
3321                                     NLM_F_MULTI)) <= 0)
3322                                         goto done;
3323                         }
3324                         break;
3325                 default:
3326                         break;
3327                 }
3328                 read_unlock_bh(&idev->lock);
3329                 in6_dev_put(idev);
3330 cont:
3331                 idx++;
3332         }
3333 done:
3334         if (err <= 0) {
3335                 read_unlock_bh(&idev->lock);
3336                 in6_dev_put(idev);
3337         }
3338         cb->args[0] = idx;
3339         cb->args[1] = ip_idx;
3340         return skb->len;
3341 }
3342
3343 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3344 {
3345         struct net *net = skb->sk->sk_net;
3346         enum addr_type_t type = UNICAST_ADDR;
3347
3348         if (net != &init_net)
3349                 return 0;
3350
3351         return inet6_dump_addr(skb, cb, type);
3352 }
3353
3354 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3355 {
3356         struct net *net = skb->sk->sk_net;
3357         enum addr_type_t type = MULTICAST_ADDR;
3358
3359         if (net != &init_net)
3360                 return 0;
3361
3362         return inet6_dump_addr(skb, cb, type);
3363 }
3364
3365
3366 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3367 {
3368         struct net *net = skb->sk->sk_net;
3369         enum addr_type_t type = ANYCAST_ADDR;
3370
3371         if (net != &init_net)
3372                 return 0;
3373
3374         return inet6_dump_addr(skb, cb, type);
3375 }
3376
3377 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3378                              void *arg)
3379 {
3380         struct net *net = in_skb->sk->sk_net;
3381         struct ifaddrmsg *ifm;
3382         struct nlattr *tb[IFA_MAX+1];
3383         struct in6_addr *addr = NULL;
3384         struct net_device *dev = NULL;
3385         struct inet6_ifaddr *ifa;
3386         struct sk_buff *skb;
3387         int err;
3388
3389         if (net != &init_net)
3390                 return -EINVAL;
3391
3392         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3393         if (err < 0)
3394                 goto errout;
3395
3396         addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3397         if (addr == NULL) {
3398                 err = -EINVAL;
3399                 goto errout;
3400         }
3401
3402         ifm = nlmsg_data(nlh);
3403         if (ifm->ifa_index)
3404                 dev = __dev_get_by_index(&init_net, ifm->ifa_index);
3405
3406         if ((ifa = ipv6_get_ifaddr(addr, dev, 1)) == NULL) {
3407                 err = -EADDRNOTAVAIL;
3408                 goto errout;
3409         }
3410
3411         if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) {
3412                 err = -ENOBUFS;
3413                 goto errout_ifa;
3414         }
3415
3416         err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3417                                 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3418         if (err < 0) {
3419                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3420                 WARN_ON(err == -EMSGSIZE);
3421                 kfree_skb(skb);
3422                 goto errout_ifa;
3423         }
3424         err = rtnl_unicast(skb, &init_net, NETLINK_CB(in_skb).pid);
3425 errout_ifa:
3426         in6_ifa_put(ifa);
3427 errout:
3428         return err;
3429 }
3430
3431 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3432 {
3433         struct sk_buff *skb;
3434         int err = -ENOBUFS;
3435
3436         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3437         if (skb == NULL)
3438                 goto errout;
3439
3440         err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3441         if (err < 0) {
3442                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3443                 WARN_ON(err == -EMSGSIZE);
3444                 kfree_skb(skb);
3445                 goto errout;
3446         }
3447         err = rtnl_notify(skb, &init_net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3448 errout:
3449         if (err < 0)
3450                 rtnl_set_sk_err(&init_net, RTNLGRP_IPV6_IFADDR, err);
3451 }
3452
3453 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3454                                 __s32 *array, int bytes)
3455 {
3456         BUG_ON(bytes < (DEVCONF_MAX * 4));
3457
3458         memset(array, 0, bytes);
3459         array[DEVCONF_FORWARDING] = cnf->forwarding;
3460         array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3461         array[DEVCONF_MTU6] = cnf->mtu6;
3462         array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3463         array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3464         array[DEVCONF_AUTOCONF] = cnf->autoconf;
3465         array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3466         array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3467         array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3468         array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3469         array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3470 #ifdef CONFIG_IPV6_PRIVACY
3471         array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3472         array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3473         array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3474         array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3475         array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3476 #endif
3477         array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3478         array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3479         array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3480 #ifdef CONFIG_IPV6_ROUTER_PREF
3481         array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3482         array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
3483 #ifdef CONFIG_IPV6_ROUTE_INFO
3484         array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3485 #endif
3486 #endif
3487         array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3488         array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3489 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3490         array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3491 #endif
3492 }
3493
3494 static inline size_t inet6_if_nlmsg_size(void)
3495 {
3496         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3497                + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3498                + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3499                + nla_total_size(4) /* IFLA_MTU */
3500                + nla_total_size(4) /* IFLA_LINK */
3501                + nla_total_size( /* IFLA_PROTINFO */
3502                         nla_total_size(4) /* IFLA_INET6_FLAGS */
3503                         + nla_total_size(sizeof(struct ifla_cacheinfo))
3504                         + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3505                         + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3506                         + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
3507                  );
3508 }
3509
3510 static inline void __snmp6_fill_stats(u64 *stats, void **mib, int items,
3511                                       int bytes)
3512 {
3513         int i;
3514         int pad = bytes - sizeof(u64) * items;
3515         BUG_ON(pad < 0);
3516
3517         /* Use put_unaligned() because stats may not be aligned for u64. */
3518         put_unaligned(items, &stats[0]);
3519         for (i = 1; i < items; i++)
3520                 put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3521
3522         memset(&stats[items], 0, pad);
3523 }
3524
3525 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3526                              int bytes)
3527 {
3528         switch(attrtype) {
3529         case IFLA_INET6_STATS:
3530                 __snmp6_fill_stats(stats, (void **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes);
3531                 break;
3532         case IFLA_INET6_ICMP6STATS:
3533                 __snmp6_fill_stats(stats, (void **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
3534                 break;
3535         }
3536 }
3537
3538 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3539                              u32 pid, u32 seq, int event, unsigned int flags)
3540 {
3541         struct net_device *dev = idev->dev;
3542         struct nlattr *nla;
3543         struct ifinfomsg *hdr;
3544         struct nlmsghdr *nlh;
3545         void *protoinfo;
3546         struct ifla_cacheinfo ci;
3547
3548         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3549         if (nlh == NULL)
3550                 return -EMSGSIZE;
3551
3552         hdr = nlmsg_data(nlh);
3553         hdr->ifi_family = AF_INET6;
3554         hdr->__ifi_pad = 0;
3555         hdr->ifi_type = dev->type;
3556         hdr->ifi_index = dev->ifindex;
3557         hdr->ifi_flags = dev_get_flags(dev);
3558         hdr->ifi_change = 0;
3559
3560         NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
3561
3562         if (dev->addr_len)
3563                 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3564
3565         NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
3566         if (dev->ifindex != dev->iflink)
3567                 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
3568
3569         protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3570         if (protoinfo == NULL)
3571                 goto nla_put_failure;
3572
3573         NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
3574
3575         ci.max_reasm_len = IPV6_MAXPLEN;
3576         ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3577                     + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3578         ci.reachable_time = idev->nd_parms->reachable_time;
3579         ci.retrans_time = idev->nd_parms->retrans_time;
3580         NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3581
3582         nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3583         if (nla == NULL)
3584                 goto nla_put_failure;
3585         ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
3586
3587         /* XXX - MC not implemented */
3588
3589         nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3590         if (nla == NULL)
3591                 goto nla_put_failure;
3592         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3593
3594         nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3595         if (nla == NULL)
3596                 goto nla_put_failure;
3597         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
3598
3599         nla_nest_end(skb, protoinfo);
3600         return nlmsg_end(skb, nlh);
3601
3602 nla_put_failure:
3603         nlmsg_cancel(skb, nlh);
3604         return -EMSGSIZE;
3605 }
3606
3607 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3608 {
3609         struct net *net = skb->sk->sk_net;
3610         int idx, err;
3611         int s_idx = cb->args[0];
3612         struct net_device *dev;
3613         struct inet6_dev *idev;
3614
3615         if (net != &init_net)
3616                 return 0;
3617
3618         read_lock(&dev_base_lock);
3619         idx = 0;
3620         for_each_netdev(&init_net, dev) {
3621                 if (idx < s_idx)
3622                         goto cont;
3623                 if ((idev = in6_dev_get(dev)) == NULL)
3624                         goto cont;
3625                 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
3626                                 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
3627                 in6_dev_put(idev);
3628                 if (err <= 0)
3629                         break;
3630 cont:
3631                 idx++;
3632         }
3633         read_unlock(&dev_base_lock);
3634         cb->args[0] = idx;
3635
3636         return skb->len;
3637 }
3638
3639 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3640 {
3641         struct sk_buff *skb;
3642         int err = -ENOBUFS;
3643
3644         skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
3645         if (skb == NULL)
3646                 goto errout;
3647
3648         err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
3649         if (err < 0) {
3650                 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3651                 WARN_ON(err == -EMSGSIZE);
3652                 kfree_skb(skb);
3653                 goto errout;
3654         }
3655         err = rtnl_notify(skb, &init_net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3656 errout:
3657         if (err < 0)
3658                 rtnl_set_sk_err(&init_net, RTNLGRP_IPV6_IFADDR, err);
3659 }
3660
3661 static inline size_t inet6_prefix_nlmsg_size(void)
3662 {
3663         return NLMSG_ALIGN(sizeof(struct prefixmsg))
3664                + nla_total_size(sizeof(struct in6_addr))
3665                + nla_total_size(sizeof(struct prefix_cacheinfo));
3666 }
3667
3668 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
3669                              struct prefix_info *pinfo, u32 pid, u32 seq,
3670                              int event, unsigned int flags)
3671 {
3672         struct prefixmsg *pmsg;
3673         struct nlmsghdr *nlh;
3674         struct prefix_cacheinfo ci;
3675
3676         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
3677         if (nlh == NULL)
3678                 return -EMSGSIZE;
3679
3680         pmsg = nlmsg_data(nlh);
3681         pmsg->prefix_family = AF_INET6;
3682         pmsg->prefix_pad1 = 0;
3683         pmsg->prefix_pad2 = 0;
3684         pmsg->prefix_ifindex = idev->dev->ifindex;
3685         pmsg->prefix_len = pinfo->prefix_len;
3686         pmsg->prefix_type = pinfo->type;
3687         pmsg->prefix_pad3 = 0;
3688         pmsg->prefix_flags = 0;
3689         if (pinfo->onlink)
3690                 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3691         if (pinfo->autoconf)
3692                 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3693
3694         NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
3695
3696         ci.preferred_time = ntohl(pinfo->prefered);
3697         ci.valid_time = ntohl(pinfo->valid);
3698         NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
3699
3700         return nlmsg_end(skb, nlh);
3701
3702 nla_put_failure:
3703         nlmsg_cancel(skb, nlh);
3704         return -EMSGSIZE;
3705 }
3706
3707 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
3708                          struct prefix_info *pinfo)
3709 {
3710         struct sk_buff *skb;
3711         int err = -ENOBUFS;
3712
3713         skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
3714         if (skb == NULL)
3715                 goto errout;
3716
3717         err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
3718         if (err < 0) {
3719                 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
3720                 WARN_ON(err == -EMSGSIZE);
3721                 kfree_skb(skb);
3722                 goto errout;
3723         }
3724         err = rtnl_notify(skb, &init_net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
3725 errout:
3726         if (err < 0)
3727                 rtnl_set_sk_err(&init_net, RTNLGRP_IPV6_PREFIX, err);
3728 }
3729
3730 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3731 {
3732         inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3733
3734         switch (event) {
3735         case RTM_NEWADDR:
3736                 /*
3737                  * If the address was optimistic
3738                  * we inserted the route at the start of
3739                  * our DAD process, so we don't need
3740                  * to do it again
3741                  */
3742                 if (!(ifp->rt->rt6i_node))
3743                         ip6_ins_rt(ifp->rt);
3744                 if (ifp->idev->cnf.forwarding)
3745                         addrconf_join_anycast(ifp);
3746                 break;
3747         case RTM_DELADDR:
3748                 if (ifp->idev->cnf.forwarding)
3749                         addrconf_leave_anycast(ifp);
3750                 addrconf_leave_solict(ifp->idev, &ifp->addr);
3751                 dst_hold(&ifp->rt->u.dst);
3752                 if (ip6_del_rt(ifp->rt))
3753                         dst_free(&ifp->rt->u.dst);
3754                 break;
3755         }
3756 }
3757
3758 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3759 {
3760         rcu_read_lock_bh();
3761         if (likely(ifp->idev->dead == 0))
3762                 __ipv6_ifa_notify(event, ifp);
3763         rcu_read_unlock_bh();
3764 }
3765
3766 #ifdef CONFIG_SYSCTL
3767
3768 static
3769 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3770                            void __user *buffer, size_t *lenp, loff_t *ppos)
3771 {
3772         int *valp = ctl->data;
3773         int val = *valp;
3774         int ret;
3775
3776         ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3777
3778         if (write)
3779                 addrconf_fixup_forwarding(ctl, valp, val);
3780         return ret;
3781 }
3782
3783 static int addrconf_sysctl_forward_strategy(ctl_table *table,
3784                                             int __user *name, int nlen,
3785                                             void __user *oldval,
3786                                             size_t __user *oldlenp,
3787                                             void __user *newval, size_t newlen)
3788 {
3789         int *valp = table->data;
3790         int val = *valp;
3791         int new;
3792
3793         if (!newval || !newlen)
3794                 return 0;
3795         if (newlen != sizeof(int))
3796                 return -EINVAL;
3797         if (get_user(new, (int __user *)newval))
3798                 return -EFAULT;
3799         if (new == *valp)
3800                 return 0;
3801         if (oldval && oldlenp) {
3802                 size_t len;
3803                 if (get_user(len, oldlenp))
3804                         return -EFAULT;
3805                 if (len) {
3806                         if (len > table->maxlen)
3807                                 len = table->maxlen;
3808                         if (copy_to_user(oldval, valp, len))
3809                                 return -EFAULT;
3810                         if (put_user(len, oldlenp))
3811                                 return -EFAULT;
3812                 }
3813         }
3814
3815         *valp = new;
3816         addrconf_fixup_forwarding(table, valp, val);
3817         return 1;
3818 }
3819
3820 static struct addrconf_sysctl_table
3821 {
3822         struct ctl_table_header *sysctl_header;
3823         ctl_table addrconf_vars[__NET_IPV6_MAX];
3824         char *dev_name;
3825 } addrconf_sysctl __read_mostly = {
3826         .sysctl_header = NULL,
3827         .addrconf_vars = {
3828                 {
3829                         .ctl_name       =       NET_IPV6_FORWARDING,
3830                         .procname       =       "forwarding",
3831                         .data           =       &ipv6_devconf.forwarding,
3832                         .maxlen         =       sizeof(int),
3833                         .mode           =       0644,
3834                         .proc_handler   =       &addrconf_sysctl_forward,
3835                         .strategy       =       &addrconf_sysctl_forward_strategy,
3836                 },
3837                 {
3838                         .ctl_name       =       NET_IPV6_HOP_LIMIT,
3839                         .procname       =       "hop_limit",
3840                         .data           =       &ipv6_devconf.hop_limit,
3841                         .maxlen         =       sizeof(int),
3842                         .mode           =       0644,
3843                         .proc_handler   =       proc_dointvec,
3844                 },
3845                 {
3846                         .ctl_name       =       NET_IPV6_MTU,
3847                         .procname       =       "mtu",
3848                         .data           =       &ipv6_devconf.mtu6,
3849                         .maxlen         =       sizeof(int),
3850                         .mode           =       0644,
3851                         .proc_handler   =       &proc_dointvec,
3852                 },
3853                 {
3854                         .ctl_name       =       NET_IPV6_ACCEPT_RA,
3855                         .procname       =       "accept_ra",
3856                         .data           =       &ipv6_devconf.accept_ra,
3857                         .maxlen         =       sizeof(int),
3858                         .mode           =       0644,
3859                         .proc_handler   =       &proc_dointvec,
3860                 },
3861                 {
3862                         .ctl_name       =       NET_IPV6_ACCEPT_REDIRECTS,
3863                         .procname       =       "accept_redirects",
3864                         .data           =       &ipv6_devconf.accept_redirects,
3865                         .maxlen         =       sizeof(int),
3866                         .mode           =       0644,
3867                         .proc_handler   =       &proc_dointvec,
3868                 },
3869                 {
3870                         .ctl_name       =       NET_IPV6_AUTOCONF,
3871                         .procname       =       "autoconf",
3872                         .data           =       &ipv6_devconf.autoconf,
3873                         .maxlen         =       sizeof(int),
3874                         .mode           =       0644,
3875                         .proc_handler   =       &proc_dointvec,
3876                 },
3877                 {
3878                         .ctl_name       =       NET_IPV6_DAD_TRANSMITS,
3879                         .procname       =       "dad_transmits",
3880                         .data           =       &ipv6_devconf.dad_transmits,
3881                         .maxlen         =       sizeof(int),
3882                         .mode           =       0644,
3883                         .proc_handler   =       &proc_dointvec,
3884                 },
3885                 {
3886                         .ctl_name       =       NET_IPV6_RTR_SOLICITS,
3887                         .procname       =       "router_solicitations",
3888                         .data           =       &ipv6_devconf.rtr_solicits,
3889                         .maxlen         =       sizeof(int),
3890                         .mode           =       0644,
3891                         .proc_handler   =       &proc_dointvec,
3892                 },
3893                 {
3894                         .ctl_name       =       NET_IPV6_RTR_SOLICIT_INTERVAL,
3895                         .procname       =       "router_solicitation_interval",
3896                         .data           =       &ipv6_devconf.rtr_solicit_interval,
3897                         .maxlen         =       sizeof(int),
3898                         .mode           =       0644,
3899                         .proc_handler   =       &proc_dointvec_jiffies,
3900                         .strategy       =       &sysctl_jiffies,
3901                 },
3902                 {
3903                         .ctl_name       =       NET_IPV6_RTR_SOLICIT_DELAY,
3904                         .procname       =       "router_solicitation_delay",
3905                         .data           =       &ipv6_devconf.rtr_solicit_delay,
3906                         .maxlen         =       sizeof(int),
3907                         .mode           =       0644,
3908                         .proc_handler   =       &proc_dointvec_jiffies,
3909                         .strategy       =       &sysctl_jiffies,
3910                 },
3911                 {
3912                         .ctl_name       =       NET_IPV6_FORCE_MLD_VERSION,
3913                         .procname       =       "force_mld_version",
3914                         .data           =       &ipv6_devconf.force_mld_version,
3915                         .maxlen         =       sizeof(int),
3916                         .mode           =       0644,
3917                         .proc_handler   =       &proc_dointvec,
3918                 },
3919 #ifdef CONFIG_IPV6_PRIVACY
3920                 {
3921                         .ctl_name       =       NET_IPV6_USE_TEMPADDR,
3922                         .procname       =       "use_tempaddr",
3923                         .data           =       &ipv6_devconf.use_tempaddr,
3924                         .maxlen         =       sizeof(int),
3925                         .mode           =       0644,
3926                         .proc_handler   =       &proc_dointvec,
3927                 },
3928                 {
3929                         .ctl_name       =       NET_IPV6_TEMP_VALID_LFT,
3930                         .procname       =       "temp_valid_lft",
3931                         .data           =       &ipv6_devconf.temp_valid_lft,
3932                         .maxlen         =       sizeof(int),
3933                         .mode           =       0644,
3934                         .proc_handler   =       &proc_dointvec,
3935                 },
3936                 {
3937                         .ctl_name       =       NET_IPV6_TEMP_PREFERED_LFT,
3938                         .procname       =       "temp_prefered_lft",
3939                         .data           =       &ipv6_devconf.temp_prefered_lft,
3940                         .maxlen         =       sizeof(int),
3941                         .mode           =       0644,
3942                         .proc_handler   =       &proc_dointvec,
3943                 },
3944                 {
3945                         .ctl_name       =       NET_IPV6_REGEN_MAX_RETRY,
3946                         .procname       =       "regen_max_retry",
3947                         .data           =       &ipv6_devconf.regen_max_retry,
3948                         .maxlen         =       sizeof(int),
3949                         .mode           =       0644,
3950                         .proc_handler   =       &proc_dointvec,
3951                 },
3952                 {
3953                         .ctl_name       =       NET_IPV6_MAX_DESYNC_FACTOR,
3954                         .procname       =       "max_desync_factor",
3955                         .data           =       &ipv6_devconf.max_desync_factor,
3956                         .maxlen         =       sizeof(int),
3957                         .mode           =       0644,
3958                         .proc_handler   =       &proc_dointvec,
3959                 },
3960 #endif
3961                 {
3962                         .ctl_name       =       NET_IPV6_MAX_ADDRESSES,
3963                         .procname       =       "max_addresses",
3964                         .data           =       &ipv6_devconf.max_addresses,
3965                         .maxlen         =       sizeof(int),
3966                         .mode           =       0644,
3967                         .proc_handler   =       &proc_dointvec,
3968                 },
3969                 {
3970                         .ctl_name       =       NET_IPV6_ACCEPT_RA_DEFRTR,
3971                         .procname       =       "accept_ra_defrtr",
3972                         .data           =       &ipv6_devconf.accept_ra_defrtr,
3973                         .maxlen         =       sizeof(int),
3974                         .mode           =       0644,
3975                         .proc_handler   =       &proc_dointvec,
3976                 },
3977                 {
3978                         .ctl_name       =       NET_IPV6_ACCEPT_RA_PINFO,
3979                         .procname       =       "accept_ra_pinfo",
3980                         .data           =       &ipv6_devconf.accept_ra_pinfo,
3981                         .maxlen         =       sizeof(int),
3982                         .mode           =       0644,
3983                         .proc_handler   =       &proc_dointvec,
3984                 },
3985 #ifdef CONFIG_IPV6_ROUTER_PREF
3986                 {
3987                         .ctl_name       =       NET_IPV6_ACCEPT_RA_RTR_PREF,
3988                         .procname       =       "accept_ra_rtr_pref",
3989                         .data           =       &ipv6_devconf.accept_ra_rtr_pref,
3990                         .maxlen         =       sizeof(int),
3991                         .mode           =       0644,
3992                         .proc_handler   =       &proc_dointvec,
3993                 },
3994                 {
3995                         .ctl_name       =       NET_IPV6_RTR_PROBE_INTERVAL,
3996                         .procname       =       "router_probe_interval",
3997                         .data           =       &ipv6_devconf.rtr_probe_interval,
3998                         .maxlen         =       sizeof(int),
3999                         .mode           =       0644,
4000                         .proc_handler   =       &proc_dointvec_jiffies,
4001                         .strategy       =       &sysctl_jiffies,
4002                 },
4003 #ifdef CONFIG_IPV6_ROUTE_INFO
4004                 {
4005                         .ctl_name       =       NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN,
4006                         .procname       =       "accept_ra_rt_info_max_plen",
4007                         .data           =       &ipv6_devconf.accept_ra_rt_info_max_plen,
4008                         .maxlen         =       sizeof(int),
4009                         .mode           =       0644,
4010                         .proc_handler   =       &proc_dointvec,
4011                 },
4012 #endif
4013 #endif
4014                 {
4015                         .ctl_name       =       NET_IPV6_PROXY_NDP,
4016                         .procname       =       "proxy_ndp",
4017                         .data           =       &ipv6_devconf.proxy_ndp,
4018                         .maxlen         =       sizeof(int),
4019                         .mode           =       0644,
4020                         .proc_handler   =       &proc_dointvec,
4021                 },
4022                 {
4023                         .ctl_name       =       NET_IPV6_ACCEPT_SOURCE_ROUTE,
4024                         .procname       =       "accept_source_route",
4025                         .data           =       &ipv6_devconf.accept_source_route,
4026                         .maxlen         =       sizeof(int),
4027                         .mode           =       0644,
4028                         .proc_handler   =       &proc_dointvec,
4029                 },
4030 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4031                 {
4032                         .ctl_name       =       CTL_UNNUMBERED,
4033                         .procname       =       "optimistic_dad",
4034                         .data           =       &ipv6_devconf.optimistic_dad,
4035                         .maxlen         =       sizeof(int),
4036                         .mode           =       0644,
4037                         .proc_handler   =       &proc_dointvec,
4038
4039                 },
4040 #endif
4041                 {
4042                         .ctl_name       =       0,      /* sentinel */
4043                 }
4044         },
4045 };
4046
4047 static void __addrconf_sysctl_register(char *dev_name, int ctl_name,
4048                 struct inet6_dev *idev, struct ipv6_devconf *p)
4049 {
4050         int i;
4051         struct addrconf_sysctl_table *t;
4052
4053 #define ADDRCONF_CTL_PATH_DEV   3
4054
4055         struct ctl_path addrconf_ctl_path[] = {
4056                 { .procname = "net", .ctl_name = CTL_NET, },
4057                 { .procname = "ipv6", .ctl_name = NET_IPV6, },
4058                 { .procname = "conf", .ctl_name = NET_IPV6_CONF, },
4059                 { /* to be set */ },
4060                 { },
4061         };
4062
4063
4064         t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4065         if (t == NULL)
4066                 goto out;
4067
4068         for (i=0; t->addrconf_vars[i].data; i++) {
4069                 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
4070                 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4071         }
4072
4073         /*
4074          * Make a copy of dev_name, because '.procname' is regarded as const
4075          * by sysctl and we wouldn't want anyone to change it under our feet
4076          * (see SIOCSIFNAME).
4077          */
4078         t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4079         if (!t->dev_name)
4080                 goto free;
4081
4082         addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
4083         addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].ctl_name = ctl_name;
4084
4085         t->sysctl_header = register_sysctl_paths(addrconf_ctl_path,
4086                         t->addrconf_vars);
4087         if (t->sysctl_header == NULL)
4088                 goto free_procname;
4089
4090         p->sysctl = t;
4091         return;
4092
4093 free_procname:
4094         kfree(t->dev_name);
4095 free:
4096         kfree(t);
4097 out:
4098         return;
4099 }
4100
4101 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4102 {
4103         struct addrconf_sysctl_table *t;
4104
4105         if (p->sysctl == NULL)
4106                 return;
4107
4108         t = p->sysctl;
4109         p->sysctl = NULL;
4110         unregister_sysctl_table(t->sysctl_header);
4111         kfree(t->dev_name);
4112         kfree(t);
4113 }
4114
4115 static void addrconf_sysctl_register(struct inet6_dev *idev)
4116 {
4117         neigh_sysctl_register(idev->dev, idev->nd_parms, NET_IPV6,
4118                               NET_IPV6_NEIGH, "ipv6",
4119                               &ndisc_ifinfo_sysctl_change,
4120                               NULL);
4121         __addrconf_sysctl_register(idev->dev->name, idev->dev->ifindex,
4122                         idev, &idev->cnf);
4123 }
4124
4125 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
4126 {
4127         __addrconf_sysctl_unregister(&idev->cnf);
4128         neigh_sysctl_unregister(idev->nd_parms);
4129 }
4130
4131
4132 #endif
4133
4134 /*
4135  *      Device notifier
4136  */
4137
4138 int register_inet6addr_notifier(struct notifier_block *nb)
4139 {
4140         return atomic_notifier_chain_register(&inet6addr_chain, nb);
4141 }
4142
4143 EXPORT_SYMBOL(register_inet6addr_notifier);
4144
4145 int unregister_inet6addr_notifier(struct notifier_block *nb)
4146 {
4147         return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
4148 }
4149
4150 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4151
4152 /*
4153  *      Init / cleanup code
4154  */
4155
4156 int __init addrconf_init(void)
4157 {
4158         int err;
4159
4160         if ((err = ipv6_addr_label_init()) < 0) {
4161                 printk(KERN_CRIT "IPv6 Addrconf: cannot initialize default policy table: %d.\n",
4162                         err);
4163                 return err;
4164         }
4165
4166         /* The addrconf netdev notifier requires that loopback_dev
4167          * has it's ipv6 private information allocated and setup
4168          * before it can bring up and give link-local addresses
4169          * to other devices which are up.
4170          *
4171          * Unfortunately, loopback_dev is not necessarily the first
4172          * entry in the global dev_base list of net devices.  In fact,
4173          * it is likely to be the very last entry on that list.
4174          * So this causes the notifier registry below to try and
4175          * give link-local addresses to all devices besides loopback_dev
4176          * first, then loopback_dev, which cases all the non-loopback_dev
4177          * devices to fail to get a link-local address.
4178          *
4179          * So, as a temporary fix, allocate the ipv6 structure for
4180          * loopback_dev first by hand.
4181          * Longer term, all of the dependencies ipv6 has upon the loopback
4182          * device and it being up should be removed.
4183          */
4184         rtnl_lock();
4185         if (!ipv6_add_dev(init_net.loopback_dev))
4186                 err = -ENOMEM;
4187         rtnl_unlock();
4188         if (err)
4189                 return err;
4190
4191         ip6_null_entry.u.dst.dev = init_net.loopback_dev;
4192         ip6_null_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev);
4193 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
4194         ip6_prohibit_entry.u.dst.dev = init_net.loopback_dev;
4195         ip6_prohibit_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev);
4196         ip6_blk_hole_entry.u.dst.dev = init_net.loopback_dev;
4197         ip6_blk_hole_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev);
4198 #endif
4199
4200         register_netdevice_notifier(&ipv6_dev_notf);
4201
4202         addrconf_verify(0);
4203
4204         err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4205         if (err < 0)
4206                 goto errout;
4207
4208         /* Only the first call to __rtnl_register can fail */
4209         __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4210         __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4211         __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4212         __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4213         __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4214
4215         ipv6_addr_label_rtnl_register();
4216
4217 #ifdef CONFIG_SYSCTL
4218         __addrconf_sysctl_register("all", NET_PROTO_CONF_ALL,
4219                         NULL, &ipv6_devconf);
4220         __addrconf_sysctl_register("default", NET_PROTO_CONF_DEFAULT,
4221                         NULL, &ipv6_devconf_dflt);
4222 #endif
4223
4224         return 0;
4225 errout:
4226         unregister_netdevice_notifier(&ipv6_dev_notf);
4227
4228         return err;
4229 }
4230
4231 void addrconf_cleanup(void)
4232 {
4233         struct net_device *dev;
4234         struct inet6_ifaddr *ifa;
4235         int i;
4236
4237         unregister_netdevice_notifier(&ipv6_dev_notf);
4238
4239 #ifdef CONFIG_SYSCTL
4240         __addrconf_sysctl_unregister(&ipv6_devconf_dflt);
4241         __addrconf_sysctl_unregister(&ipv6_devconf);
4242 #endif
4243
4244         rtnl_lock();
4245
4246         /*
4247          *      clean dev list.
4248          */
4249
4250         for_each_netdev(&init_net, dev) {
4251                 if (__in6_dev_get(dev) == NULL)
4252                         continue;
4253                 addrconf_ifdown(dev, 1);
4254         }
4255         addrconf_ifdown(init_net.loopback_dev, 2);
4256
4257         /*
4258          *      Check hash table.
4259          */
4260
4261         write_lock_bh(&addrconf_hash_lock);
4262         for (i=0; i < IN6_ADDR_HSIZE; i++) {
4263                 for (ifa=inet6_addr_lst[i]; ifa; ) {
4264                         struct inet6_ifaddr *bifa;
4265
4266                         bifa = ifa;
4267                         ifa = ifa->lst_next;
4268                         printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
4269                         /* Do not free it; something is wrong.
4270                            Now we can investigate it with debugger.
4271                          */
4272                 }
4273         }
4274         write_unlock_bh(&addrconf_hash_lock);
4275
4276         del_timer(&addr_chk_timer);
4277
4278         rtnl_unlock();
4279 }