[IPV6]: Unify ip6_onlink() and ipip6_onlink().
[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(struct net *net, const struct in6_addr *addr,
153                               struct net_device *dev);
154
155 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
156
157 struct ipv6_devconf ipv6_devconf __read_mostly = {
158         .forwarding             = 0,
159         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
160         .mtu6                   = IPV6_MIN_MTU,
161         .accept_ra              = 1,
162         .accept_redirects       = 1,
163         .autoconf               = 1,
164         .force_mld_version      = 0,
165         .dad_transmits          = 1,
166         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
167         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
168         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
169 #ifdef CONFIG_IPV6_PRIVACY
170         .use_tempaddr           = 0,
171         .temp_valid_lft         = TEMP_VALID_LIFETIME,
172         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
173         .regen_max_retry        = REGEN_MAX_RETRY,
174         .max_desync_factor      = MAX_DESYNC_FACTOR,
175 #endif
176         .max_addresses          = IPV6_MAX_ADDRESSES,
177         .accept_ra_defrtr       = 1,
178         .accept_ra_pinfo        = 1,
179 #ifdef CONFIG_IPV6_ROUTER_PREF
180         .accept_ra_rtr_pref     = 1,
181         .rtr_probe_interval     = 60 * HZ,
182 #ifdef CONFIG_IPV6_ROUTE_INFO
183         .accept_ra_rt_info_max_plen = 0,
184 #endif
185 #endif
186         .proxy_ndp              = 0,
187         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
188 };
189
190 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
191         .forwarding             = 0,
192         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
193         .mtu6                   = IPV6_MIN_MTU,
194         .accept_ra              = 1,
195         .accept_redirects       = 1,
196         .autoconf               = 1,
197         .dad_transmits          = 1,
198         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
199         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
200         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
201 #ifdef CONFIG_IPV6_PRIVACY
202         .use_tempaddr           = 0,
203         .temp_valid_lft         = TEMP_VALID_LIFETIME,
204         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
205         .regen_max_retry        = REGEN_MAX_RETRY,
206         .max_desync_factor      = MAX_DESYNC_FACTOR,
207 #endif
208         .max_addresses          = IPV6_MAX_ADDRESSES,
209         .accept_ra_defrtr       = 1,
210         .accept_ra_pinfo        = 1,
211 #ifdef CONFIG_IPV6_ROUTER_PREF
212         .accept_ra_rtr_pref     = 1,
213         .rtr_probe_interval     = 60 * HZ,
214 #ifdef CONFIG_IPV6_ROUTE_INFO
215         .accept_ra_rt_info_max_plen = 0,
216 #endif
217 #endif
218         .proxy_ndp              = 0,
219         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
220 };
221
222 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
223 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
224 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
225
226 /* Check if a valid qdisc is available */
227 static inline int addrconf_qdisc_ok(struct net_device *dev)
228 {
229         return (dev->qdisc != &noop_qdisc);
230 }
231
232 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
233 {
234         if (del_timer(&ifp->timer))
235                 __in6_ifa_put(ifp);
236 }
237
238 enum addrconf_timer_t
239 {
240         AC_NONE,
241         AC_DAD,
242         AC_RS,
243 };
244
245 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
246                                enum addrconf_timer_t what,
247                                unsigned long when)
248 {
249         if (!del_timer(&ifp->timer))
250                 in6_ifa_hold(ifp);
251
252         switch (what) {
253         case AC_DAD:
254                 ifp->timer.function = addrconf_dad_timer;
255                 break;
256         case AC_RS:
257                 ifp->timer.function = addrconf_rs_timer;
258                 break;
259         default:;
260         }
261         ifp->timer.expires = jiffies + when;
262         add_timer(&ifp->timer);
263 }
264
265 static int snmp6_alloc_dev(struct inet6_dev *idev)
266 {
267         if (snmp_mib_init((void **)idev->stats.ipv6,
268                           sizeof(struct ipstats_mib)) < 0)
269                 goto err_ip;
270         if (snmp_mib_init((void **)idev->stats.icmpv6,
271                           sizeof(struct icmpv6_mib)) < 0)
272                 goto err_icmp;
273         if (snmp_mib_init((void **)idev->stats.icmpv6msg,
274                           sizeof(struct icmpv6msg_mib)) < 0)
275                 goto err_icmpmsg;
276
277         return 0;
278
279 err_icmpmsg:
280         snmp_mib_free((void **)idev->stats.icmpv6);
281 err_icmp:
282         snmp_mib_free((void **)idev->stats.ipv6);
283 err_ip:
284         return -ENOMEM;
285 }
286
287 static void snmp6_free_dev(struct inet6_dev *idev)
288 {
289         snmp_mib_free((void **)idev->stats.icmpv6msg);
290         snmp_mib_free((void **)idev->stats.icmpv6);
291         snmp_mib_free((void **)idev->stats.ipv6);
292 }
293
294 /* Nobody refers to this device, we may destroy it. */
295
296 static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
297 {
298         struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
299         kfree(idev);
300 }
301
302 void in6_dev_finish_destroy(struct inet6_dev *idev)
303 {
304         struct net_device *dev = idev->dev;
305         BUG_TRAP(idev->addr_list==NULL);
306         BUG_TRAP(idev->mc_list==NULL);
307 #ifdef NET_REFCNT_DEBUG
308         printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
309 #endif
310         dev_put(dev);
311         if (!idev->dead) {
312                 printk("Freeing alive inet6 device %p\n", idev);
313                 return;
314         }
315         snmp6_free_dev(idev);
316         call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
317 }
318
319 EXPORT_SYMBOL(in6_dev_finish_destroy);
320
321 static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
322 {
323         struct inet6_dev *ndev;
324         struct in6_addr maddr;
325
326         ASSERT_RTNL();
327
328         if (dev->mtu < IPV6_MIN_MTU)
329                 return NULL;
330
331         ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
332
333         if (ndev == NULL)
334                 return NULL;
335
336         rwlock_init(&ndev->lock);
337         ndev->dev = dev;
338         memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
339         ndev->cnf.mtu6 = dev->mtu;
340         ndev->cnf.sysctl = NULL;
341         ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
342         if (ndev->nd_parms == NULL) {
343                 kfree(ndev);
344                 return NULL;
345         }
346         /* We refer to the device */
347         dev_hold(dev);
348
349         if (snmp6_alloc_dev(ndev) < 0) {
350                 ADBG((KERN_WARNING
351                         "%s(): cannot allocate memory for statistics; dev=%s.\n",
352                         __func__, dev->name));
353                 neigh_parms_release(&nd_tbl, ndev->nd_parms);
354                 ndev->dead = 1;
355                 in6_dev_finish_destroy(ndev);
356                 return NULL;
357         }
358
359         if (snmp6_register_dev(ndev) < 0) {
360                 ADBG((KERN_WARNING
361                         "%s(): cannot create /proc/net/dev_snmp6/%s\n",
362                         __func__, dev->name));
363                 neigh_parms_release(&nd_tbl, ndev->nd_parms);
364                 ndev->dead = 1;
365                 in6_dev_finish_destroy(ndev);
366                 return NULL;
367         }
368
369         /* One reference from device.  We must do this before
370          * we invoke __ipv6_regen_rndid().
371          */
372         in6_dev_hold(ndev);
373
374 #ifdef CONFIG_IPV6_PRIVACY
375         setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
376         if ((dev->flags&IFF_LOOPBACK) ||
377             dev->type == ARPHRD_TUNNEL ||
378 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
379             dev->type == ARPHRD_SIT ||
380 #endif
381             dev->type == ARPHRD_NONE) {
382                 printk(KERN_INFO
383                        "%s: Disabled Privacy Extensions\n",
384                        dev->name);
385                 ndev->cnf.use_tempaddr = -1;
386
387                 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
388                         printk(KERN_INFO
389                                "%s: Disabled Multicast RS\n",
390                                dev->name);
391                         ndev->cnf.rtr_solicits = 0;
392                 }
393         } else {
394                 in6_dev_hold(ndev);
395                 ipv6_regen_rndid((unsigned long) ndev);
396         }
397 #endif
398
399         if (netif_running(dev) && addrconf_qdisc_ok(dev))
400                 ndev->if_flags |= IF_READY;
401
402         ipv6_mc_init_dev(ndev);
403         ndev->tstamp = jiffies;
404         addrconf_sysctl_register(ndev);
405         /* protected by rtnl_lock */
406         rcu_assign_pointer(dev->ip6_ptr, ndev);
407
408         /* Join all-node multicast group */
409         ipv6_addr_all_nodes(&maddr);
410         ipv6_dev_mc_inc(dev, &maddr);
411
412         return ndev;
413 }
414
415 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
416 {
417         struct inet6_dev *idev;
418
419         ASSERT_RTNL();
420
421         if ((idev = __in6_dev_get(dev)) == NULL) {
422                 if ((idev = ipv6_add_dev(dev)) == NULL)
423                         return NULL;
424         }
425
426         if (dev->flags&IFF_UP)
427                 ipv6_mc_up(idev);
428         return idev;
429 }
430
431 #ifdef CONFIG_SYSCTL
432 static void dev_forward_change(struct inet6_dev *idev)
433 {
434         struct net_device *dev;
435         struct inet6_ifaddr *ifa;
436         struct in6_addr addr;
437
438         if (!idev)
439                 return;
440         dev = idev->dev;
441         if (dev && (dev->flags & IFF_MULTICAST)) {
442                 ipv6_addr_all_routers(&addr);
443
444                 if (idev->cnf.forwarding)
445                         ipv6_dev_mc_inc(dev, &addr);
446                 else
447                         ipv6_dev_mc_dec(dev, &addr);
448         }
449         for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
450                 if (ifa->flags&IFA_F_TENTATIVE)
451                         continue;
452                 if (idev->cnf.forwarding)
453                         addrconf_join_anycast(ifa);
454                 else
455                         addrconf_leave_anycast(ifa);
456         }
457 }
458
459
460 static void addrconf_forward_change(struct net *net, __s32 newf)
461 {
462         struct net_device *dev;
463         struct inet6_dev *idev;
464
465         read_lock(&dev_base_lock);
466         for_each_netdev(net, dev) {
467                 rcu_read_lock();
468                 idev = __in6_dev_get(dev);
469                 if (idev) {
470                         int changed = (!idev->cnf.forwarding) ^ (!newf);
471                         idev->cnf.forwarding = newf;
472                         if (changed)
473                                 dev_forward_change(idev);
474                 }
475                 rcu_read_unlock();
476         }
477         read_unlock(&dev_base_lock);
478 }
479
480 static void addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old)
481 {
482         struct net *net;
483
484         net = (struct net *)table->extra2;
485         if (p == &net->ipv6.devconf_dflt->forwarding)
486                 return;
487
488         if (p == &net->ipv6.devconf_all->forwarding) {
489                 __s32 newf = net->ipv6.devconf_all->forwarding;
490                 net->ipv6.devconf_dflt->forwarding = newf;
491                 addrconf_forward_change(net, newf);
492         } else if ((!*p) ^ (!old))
493                 dev_forward_change((struct inet6_dev *)table->extra1);
494
495         if (*p)
496                 rt6_purge_dflt_routers(net);
497 }
498 #endif
499
500 /* Nobody refers to this ifaddr, destroy it */
501
502 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
503 {
504         BUG_TRAP(ifp->if_next==NULL);
505         BUG_TRAP(ifp->lst_next==NULL);
506 #ifdef NET_REFCNT_DEBUG
507         printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
508 #endif
509
510         in6_dev_put(ifp->idev);
511
512         if (del_timer(&ifp->timer))
513                 printk("Timer is still running, when freeing ifa=%p\n", ifp);
514
515         if (!ifp->dead) {
516                 printk("Freeing alive inet6 address %p\n", ifp);
517                 return;
518         }
519         dst_release(&ifp->rt->u.dst);
520
521         kfree(ifp);
522 }
523
524 static void
525 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
526 {
527         struct inet6_ifaddr *ifa, **ifap;
528         int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
529
530         /*
531          * Each device address list is sorted in order of scope -
532          * global before linklocal.
533          */
534         for (ifap = &idev->addr_list; (ifa = *ifap) != NULL;
535              ifap = &ifa->if_next) {
536                 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
537                         break;
538         }
539
540         ifp->if_next = *ifap;
541         *ifap = ifp;
542 }
543
544 /* On success it returns ifp with increased reference count */
545
546 static struct inet6_ifaddr *
547 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
548               int scope, u32 flags)
549 {
550         struct inet6_ifaddr *ifa = NULL;
551         struct rt6_info *rt;
552         int hash;
553         int err = 0;
554
555         rcu_read_lock_bh();
556         if (idev->dead) {
557                 err = -ENODEV;                  /*XXX*/
558                 goto out2;
559         }
560
561         write_lock(&addrconf_hash_lock);
562
563         /* Ignore adding duplicate addresses on an interface */
564         if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
565                 ADBG(("ipv6_add_addr: already assigned\n"));
566                 err = -EEXIST;
567                 goto out;
568         }
569
570         ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
571
572         if (ifa == NULL) {
573                 ADBG(("ipv6_add_addr: malloc failed\n"));
574                 err = -ENOBUFS;
575                 goto out;
576         }
577
578         rt = addrconf_dst_alloc(idev, addr, 0);
579         if (IS_ERR(rt)) {
580                 err = PTR_ERR(rt);
581                 goto out;
582         }
583
584         ipv6_addr_copy(&ifa->addr, addr);
585
586         spin_lock_init(&ifa->lock);
587         init_timer(&ifa->timer);
588         ifa->timer.data = (unsigned long) ifa;
589         ifa->scope = scope;
590         ifa->prefix_len = pfxlen;
591         ifa->flags = flags | IFA_F_TENTATIVE;
592         ifa->cstamp = ifa->tstamp = jiffies;
593
594         ifa->rt = rt;
595
596         /*
597          * part one of RFC 4429, section 3.3
598          * We should not configure an address as
599          * optimistic if we do not yet know the link
600          * layer address of our nexhop router
601          */
602
603         if (rt->rt6i_nexthop == NULL)
604                 ifa->flags &= ~IFA_F_OPTIMISTIC;
605
606         ifa->idev = idev;
607         in6_dev_hold(idev);
608         /* For caller */
609         in6_ifa_hold(ifa);
610
611         /* Add to big hash table */
612         hash = ipv6_addr_hash(addr);
613
614         ifa->lst_next = inet6_addr_lst[hash];
615         inet6_addr_lst[hash] = ifa;
616         in6_ifa_hold(ifa);
617         write_unlock(&addrconf_hash_lock);
618
619         write_lock(&idev->lock);
620         /* Add to inet6_dev unicast addr list. */
621         ipv6_link_dev_addr(idev, ifa);
622
623 #ifdef CONFIG_IPV6_PRIVACY
624         if (ifa->flags&IFA_F_TEMPORARY) {
625                 ifa->tmp_next = idev->tempaddr_list;
626                 idev->tempaddr_list = ifa;
627                 in6_ifa_hold(ifa);
628         }
629 #endif
630
631         in6_ifa_hold(ifa);
632         write_unlock(&idev->lock);
633 out2:
634         rcu_read_unlock_bh();
635
636         if (likely(err == 0))
637                 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
638         else {
639                 kfree(ifa);
640                 ifa = ERR_PTR(err);
641         }
642
643         return ifa;
644 out:
645         write_unlock(&addrconf_hash_lock);
646         goto out2;
647 }
648
649 /* This function wants to get referenced ifp and releases it before return */
650
651 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
652 {
653         struct inet6_ifaddr *ifa, **ifap;
654         struct inet6_dev *idev = ifp->idev;
655         int hash;
656         int deleted = 0, onlink = 0;
657         unsigned long expires = jiffies;
658
659         hash = ipv6_addr_hash(&ifp->addr);
660
661         ifp->dead = 1;
662
663         write_lock_bh(&addrconf_hash_lock);
664         for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
665              ifap = &ifa->lst_next) {
666                 if (ifa == ifp) {
667                         *ifap = ifa->lst_next;
668                         __in6_ifa_put(ifp);
669                         ifa->lst_next = NULL;
670                         break;
671                 }
672         }
673         write_unlock_bh(&addrconf_hash_lock);
674
675         write_lock_bh(&idev->lock);
676 #ifdef CONFIG_IPV6_PRIVACY
677         if (ifp->flags&IFA_F_TEMPORARY) {
678                 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
679                      ifap = &ifa->tmp_next) {
680                         if (ifa == ifp) {
681                                 *ifap = ifa->tmp_next;
682                                 if (ifp->ifpub) {
683                                         in6_ifa_put(ifp->ifpub);
684                                         ifp->ifpub = NULL;
685                                 }
686                                 __in6_ifa_put(ifp);
687                                 ifa->tmp_next = NULL;
688                                 break;
689                         }
690                 }
691         }
692 #endif
693
694         for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
695                 if (ifa == ifp) {
696                         *ifap = ifa->if_next;
697                         __in6_ifa_put(ifp);
698                         ifa->if_next = NULL;
699                         if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
700                                 break;
701                         deleted = 1;
702                         continue;
703                 } else if (ifp->flags & IFA_F_PERMANENT) {
704                         if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
705                                               ifp->prefix_len)) {
706                                 if (ifa->flags & IFA_F_PERMANENT) {
707                                         onlink = 1;
708                                         if (deleted)
709                                                 break;
710                                 } else {
711                                         unsigned long lifetime;
712
713                                         if (!onlink)
714                                                 onlink = -1;
715
716                                         spin_lock(&ifa->lock);
717                                         lifetime = min_t(unsigned long,
718                                                          ifa->valid_lft, 0x7fffffffUL/HZ);
719                                         if (time_before(expires,
720                                                         ifa->tstamp + lifetime * HZ))
721                                                 expires = ifa->tstamp + lifetime * HZ;
722                                         spin_unlock(&ifa->lock);
723                                 }
724                         }
725                 }
726                 ifap = &ifa->if_next;
727         }
728         write_unlock_bh(&idev->lock);
729
730         ipv6_ifa_notify(RTM_DELADDR, ifp);
731
732         atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
733
734         addrconf_del_timer(ifp);
735
736         /*
737          * Purge or update corresponding prefix
738          *
739          * 1) we don't purge prefix here if address was not permanent.
740          *    prefix is managed by its own lifetime.
741          * 2) if there're no addresses, delete prefix.
742          * 3) if there're still other permanent address(es),
743          *    corresponding prefix is still permanent.
744          * 4) otherwise, update prefix lifetime to the
745          *    longest valid lifetime among the corresponding
746          *    addresses on the device.
747          *    Note: subsequent RA will update lifetime.
748          *
749          * --yoshfuji
750          */
751         if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
752                 struct in6_addr prefix;
753                 struct rt6_info *rt;
754                 struct net *net = dev_net(ifp->idev->dev);
755                 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
756                 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1);
757
758                 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
759                         if (onlink == 0) {
760                                 ip6_del_rt(rt);
761                                 rt = NULL;
762                         } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
763                                 rt->rt6i_expires = expires;
764                                 rt->rt6i_flags |= RTF_EXPIRES;
765                         }
766                 }
767                 dst_release(&rt->u.dst);
768         }
769
770         in6_ifa_put(ifp);
771 }
772
773 #ifdef CONFIG_IPV6_PRIVACY
774 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
775 {
776         struct inet6_dev *idev = ifp->idev;
777         struct in6_addr addr, *tmpaddr;
778         unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
779         int tmp_plen;
780         int ret = 0;
781         int max_addresses;
782         u32 addr_flags;
783
784         write_lock(&idev->lock);
785         if (ift) {
786                 spin_lock_bh(&ift->lock);
787                 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
788                 spin_unlock_bh(&ift->lock);
789                 tmpaddr = &addr;
790         } else {
791                 tmpaddr = NULL;
792         }
793 retry:
794         in6_dev_hold(idev);
795         if (idev->cnf.use_tempaddr <= 0) {
796                 write_unlock(&idev->lock);
797                 printk(KERN_INFO
798                         "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
799                 in6_dev_put(idev);
800                 ret = -1;
801                 goto out;
802         }
803         spin_lock_bh(&ifp->lock);
804         if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
805                 idev->cnf.use_tempaddr = -1;    /*XXX*/
806                 spin_unlock_bh(&ifp->lock);
807                 write_unlock(&idev->lock);
808                 printk(KERN_WARNING
809                         "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
810                 in6_dev_put(idev);
811                 ret = -1;
812                 goto out;
813         }
814         in6_ifa_hold(ifp);
815         memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
816         if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
817                 spin_unlock_bh(&ifp->lock);
818                 write_unlock(&idev->lock);
819                 printk(KERN_WARNING
820                         "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
821                 in6_ifa_put(ifp);
822                 in6_dev_put(idev);
823                 ret = -1;
824                 goto out;
825         }
826         memcpy(&addr.s6_addr[8], idev->rndid, 8);
827         tmp_valid_lft = min_t(__u32,
828                               ifp->valid_lft,
829                               idev->cnf.temp_valid_lft);
830         tmp_prefered_lft = min_t(__u32,
831                                  ifp->prefered_lft,
832                                  idev->cnf.temp_prefered_lft - desync_factor / HZ);
833         tmp_plen = ifp->prefix_len;
834         max_addresses = idev->cnf.max_addresses;
835         tmp_cstamp = ifp->cstamp;
836         tmp_tstamp = ifp->tstamp;
837         spin_unlock_bh(&ifp->lock);
838
839         write_unlock(&idev->lock);
840
841         addr_flags = IFA_F_TEMPORARY;
842         /* set in addrconf_prefix_rcv() */
843         if (ifp->flags & IFA_F_OPTIMISTIC)
844                 addr_flags |= IFA_F_OPTIMISTIC;
845
846         ift = !max_addresses ||
847               ipv6_count_addresses(idev) < max_addresses ?
848                 ipv6_add_addr(idev, &addr, tmp_plen,
849                               ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
850                               addr_flags) : NULL;
851         if (!ift || IS_ERR(ift)) {
852                 in6_ifa_put(ifp);
853                 in6_dev_put(idev);
854                 printk(KERN_INFO
855                         "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
856                 tmpaddr = &addr;
857                 write_lock(&idev->lock);
858                 goto retry;
859         }
860
861         spin_lock_bh(&ift->lock);
862         ift->ifpub = ifp;
863         ift->valid_lft = tmp_valid_lft;
864         ift->prefered_lft = tmp_prefered_lft;
865         ift->cstamp = tmp_cstamp;
866         ift->tstamp = tmp_tstamp;
867         spin_unlock_bh(&ift->lock);
868
869         addrconf_dad_start(ift, 0);
870         in6_ifa_put(ift);
871         in6_dev_put(idev);
872 out:
873         return ret;
874 }
875 #endif
876
877 /*
878  *      Choose an appropriate source address (RFC3484)
879  */
880 enum {
881         IPV6_SADDR_RULE_INIT = 0,
882         IPV6_SADDR_RULE_LOCAL,
883         IPV6_SADDR_RULE_SCOPE,
884         IPV6_SADDR_RULE_PREFERRED,
885 #ifdef CONFIG_IPV6_MIP6
886         IPV6_SADDR_RULE_HOA,
887 #endif
888         IPV6_SADDR_RULE_OIF,
889         IPV6_SADDR_RULE_LABEL,
890 #ifdef CONFIG_IPV6_PRIVACY
891         IPV6_SADDR_RULE_PRIVACY,
892 #endif
893         IPV6_SADDR_RULE_ORCHID,
894         IPV6_SADDR_RULE_PREFIX,
895         IPV6_SADDR_RULE_MAX
896 };
897
898 struct ipv6_saddr_score {
899         int                     rule;
900         int                     addr_type;
901         struct inet6_ifaddr     *ifa;
902         DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
903         int                     scopedist;
904         int                     matchlen;
905 };
906
907 struct ipv6_saddr_dst {
908         struct in6_addr *addr;
909         int ifindex;
910         int scope;
911         int label;
912         unsigned int prefs;
913 };
914
915 static inline int ipv6_saddr_preferred(int type)
916 {
917         if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
918                     IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
919                 return 1;
920         return 0;
921 }
922
923 static int ipv6_get_saddr_eval(struct ipv6_saddr_score *score,
924                                struct ipv6_saddr_dst *dst,
925                                int i)
926 {
927         int ret;
928
929         if (i <= score->rule) {
930                 switch (i) {
931                 case IPV6_SADDR_RULE_SCOPE:
932                         ret = score->scopedist;
933                         break;
934                 case IPV6_SADDR_RULE_PREFIX:
935                         ret = score->matchlen;
936                         break;
937                 default:
938                         ret = !!test_bit(i, score->scorebits);
939                 }
940                 goto out;
941         }
942
943         switch (i) {
944         case IPV6_SADDR_RULE_INIT:
945                 /* Rule 0: remember if hiscore is not ready yet */
946                 ret = !!score->ifa;
947                 break;
948         case IPV6_SADDR_RULE_LOCAL:
949                 /* Rule 1: Prefer same address */
950                 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
951                 break;
952         case IPV6_SADDR_RULE_SCOPE:
953                 /* Rule 2: Prefer appropriate scope
954                  *
955                  *      ret
956                  *       ^
957                  *    -1 |  d 15
958                  *    ---+--+-+---> scope
959                  *       |
960                  *       |             d is scope of the destination.
961                  *  B-d  |  \
962                  *       |   \      <- smaller scope is better if
963                  *  B-15 |    \        if scope is enough for destinaion.
964                  *       |             ret = B - scope (-1 <= scope >= d <= 15).
965                  * d-C-1 | /
966                  *       |/         <- greater is better
967                  *   -C  /             if scope is not enough for destination.
968                  *      /|             ret = scope - C (-1 <= d < scope <= 15).
969                  *
970                  * d - C - 1 < B -15 (for all -1 <= d <= 15).
971                  * C > d + 14 - B >= 15 + 14 - B = 29 - B.
972                  * Assume B = 0 and we get C > 29.
973                  */
974                 ret = __ipv6_addr_src_scope(score->addr_type);
975                 if (ret >= dst->scope)
976                         ret = -ret;
977                 else
978                         ret -= 128;     /* 30 is enough */
979                 score->scopedist = ret;
980                 break;
981         case IPV6_SADDR_RULE_PREFERRED:
982                 /* Rule 3: Avoid deprecated and optimistic addresses */
983                 ret = ipv6_saddr_preferred(score->addr_type) ||
984                       !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
985                 break;
986 #ifdef CONFIG_IPV6_MIP6
987         case IPV6_SADDR_RULE_HOA:
988             {
989                 /* Rule 4: Prefer home address */
990                 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
991                 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
992                 break;
993             }
994 #endif
995         case IPV6_SADDR_RULE_OIF:
996                 /* Rule 5: Prefer outgoing interface */
997                 ret = (!dst->ifindex ||
998                        dst->ifindex == score->ifa->idev->dev->ifindex);
999                 break;
1000         case IPV6_SADDR_RULE_LABEL:
1001                 /* Rule 6: Prefer matching label */
1002                 ret = ipv6_addr_label(&score->ifa->addr, score->addr_type,
1003                                       score->ifa->idev->dev->ifindex) == dst->label;
1004                 break;
1005 #ifdef CONFIG_IPV6_PRIVACY
1006         case IPV6_SADDR_RULE_PRIVACY:
1007             {
1008                 /* Rule 7: Prefer public address
1009                  * Note: prefer temprary address if use_tempaddr >= 2
1010                  */
1011                 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1012                                 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1013                                 score->ifa->idev->cnf.use_tempaddr >= 2;
1014                 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1015                 break;
1016             }
1017 #endif
1018         case IPV6_SADDR_RULE_ORCHID:
1019                 /* Rule 8-: Prefer ORCHID vs ORCHID or
1020                  *          non-ORCHID vs non-ORCHID
1021                  */
1022                 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1023                         ipv6_addr_orchid(dst->addr));
1024                 break;
1025         case IPV6_SADDR_RULE_PREFIX:
1026                 /* Rule 8: Use longest matching prefix */
1027                 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr,
1028                                                        dst->addr);
1029                 break;
1030         default:
1031                 ret = 0;
1032         }
1033
1034         if (ret)
1035                 __set_bit(i, score->scorebits);
1036         score->rule = i;
1037 out:
1038         return ret;
1039 }
1040
1041 int ipv6_dev_get_saddr(struct net_device *dst_dev,
1042                        struct in6_addr *daddr, unsigned int prefs,
1043                        struct in6_addr *saddr)
1044 {
1045         struct ipv6_saddr_score scores[2],
1046                                 *score = &scores[0], *hiscore = &scores[1];
1047         struct net *net = dev_net(dst_dev);
1048         struct ipv6_saddr_dst dst;
1049         struct net_device *dev;
1050         int dst_type;
1051
1052         dst_type = __ipv6_addr_type(daddr);
1053         dst.addr = daddr;
1054         dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1055         dst.scope = __ipv6_addr_src_scope(dst_type);
1056         dst.label = ipv6_addr_label(daddr, dst_type, dst.ifindex);
1057         dst.prefs = prefs;
1058
1059         hiscore->rule = -1;
1060         hiscore->ifa = NULL;
1061
1062         read_lock(&dev_base_lock);
1063         rcu_read_lock();
1064
1065         for_each_netdev(net, dev) {
1066                 struct inet6_dev *idev;
1067
1068                 /* Candidate Source Address (section 4)
1069                  *  - multicast and link-local destination address,
1070                  *    the set of candidate source address MUST only
1071                  *    include addresses assigned to interfaces
1072                  *    belonging to the same link as the outgoing
1073                  *    interface.
1074                  * (- For site-local destination addresses, the
1075                  *    set of candidate source addresses MUST only
1076                  *    include addresses assigned to interfaces
1077                  *    belonging to the same site as the outgoing
1078                  *    interface.)
1079                  */
1080                 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1081                      dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1082                     dst.ifindex && dev->ifindex != dst.ifindex)
1083                         continue;
1084
1085                 idev = __in6_dev_get(dev);
1086                 if (!idev)
1087                         continue;
1088
1089                 read_lock_bh(&idev->lock);
1090                 for (score->ifa = idev->addr_list; score->ifa; score->ifa = score->ifa->if_next) {
1091                         int i;
1092
1093                         /*
1094                          * - Tentative Address (RFC2462 section 5.4)
1095                          *  - A tentative address is not considered
1096                          *    "assigned to an interface" in the traditional
1097                          *    sense, unless it is also flagged as optimistic.
1098                          * - Candidate Source Address (section 4)
1099                          *  - In any case, anycast addresses, multicast
1100                          *    addresses, and the unspecified address MUST
1101                          *    NOT be included in a candidate set.
1102                          */
1103                         if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1104                             (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1105                                 continue;
1106
1107                         score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1108
1109                         if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1110                                      score->addr_type & IPV6_ADDR_MULTICAST)) {
1111                                 LIMIT_NETDEBUG(KERN_DEBUG
1112                                                "ADDRCONF: unspecified / multicast address "
1113                                                "assigned as unicast address on %s",
1114                                                dev->name);
1115                                 continue;
1116                         }
1117
1118                         score->rule = -1;
1119                         bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1120
1121                         for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1122                                 int minihiscore, miniscore;
1123
1124                                 minihiscore = ipv6_get_saddr_eval(hiscore, &dst, i);
1125                                 miniscore = ipv6_get_saddr_eval(score, &dst, i);
1126
1127                                 if (minihiscore > miniscore) {
1128                                         if (i == IPV6_SADDR_RULE_SCOPE &&
1129                                             score->scopedist > 0) {
1130                                                 /*
1131                                                  * special case:
1132                                                  * each remaining entry
1133                                                  * has too small (not enough)
1134                                                  * scope, because ifa entries
1135                                                  * are sorted by their scope
1136                                                  * values.
1137                                                  */
1138                                                 goto try_nextdev;
1139                                         }
1140                                         break;
1141                                 } else if (minihiscore < miniscore) {
1142                                         struct ipv6_saddr_score *tmp;
1143
1144                                         if (hiscore->ifa)
1145                                                 in6_ifa_put(hiscore->ifa);
1146
1147                                         in6_ifa_hold(score->ifa);
1148
1149                                         tmp = hiscore;
1150                                         hiscore = score;
1151                                         score = tmp;
1152
1153                                         /* restore our iterator */
1154                                         score->ifa = hiscore->ifa;
1155
1156                                         break;
1157                                 }
1158                         }
1159                 }
1160 try_nextdev:
1161                 read_unlock_bh(&idev->lock);
1162         }
1163         rcu_read_unlock();
1164         read_unlock(&dev_base_lock);
1165
1166         if (!hiscore->ifa)
1167                 return -EADDRNOTAVAIL;
1168
1169         ipv6_addr_copy(saddr, &hiscore->ifa->addr);
1170         in6_ifa_put(hiscore->ifa);
1171         return 0;
1172 }
1173
1174 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1175
1176 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1177                     unsigned char banned_flags)
1178 {
1179         struct inet6_dev *idev;
1180         int err = -EADDRNOTAVAIL;
1181
1182         rcu_read_lock();
1183         if ((idev = __in6_dev_get(dev)) != NULL) {
1184                 struct inet6_ifaddr *ifp;
1185
1186                 read_lock_bh(&idev->lock);
1187                 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1188                         if (ifp->scope == IFA_LINK && !(ifp->flags & banned_flags)) {
1189                                 ipv6_addr_copy(addr, &ifp->addr);
1190                                 err = 0;
1191                                 break;
1192                         }
1193                 }
1194                 read_unlock_bh(&idev->lock);
1195         }
1196         rcu_read_unlock();
1197         return err;
1198 }
1199
1200 static int ipv6_count_addresses(struct inet6_dev *idev)
1201 {
1202         int cnt = 0;
1203         struct inet6_ifaddr *ifp;
1204
1205         read_lock_bh(&idev->lock);
1206         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1207                 cnt++;
1208         read_unlock_bh(&idev->lock);
1209         return cnt;
1210 }
1211
1212 int ipv6_chk_addr(struct net *net, struct in6_addr *addr,
1213                   struct net_device *dev, int strict)
1214 {
1215         struct inet6_ifaddr * ifp;
1216         u8 hash = ipv6_addr_hash(addr);
1217
1218         read_lock_bh(&addrconf_hash_lock);
1219         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1220                 if (!net_eq(dev_net(ifp->idev->dev), net))
1221                         continue;
1222                 if (ipv6_addr_equal(&ifp->addr, addr) &&
1223                     !(ifp->flags&IFA_F_TENTATIVE)) {
1224                         if (dev == NULL || ifp->idev->dev == dev ||
1225                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1226                                 break;
1227                 }
1228         }
1229         read_unlock_bh(&addrconf_hash_lock);
1230         return ifp != NULL;
1231 }
1232 EXPORT_SYMBOL(ipv6_chk_addr);
1233
1234 static
1235 int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1236                        struct net_device *dev)
1237 {
1238         struct inet6_ifaddr * ifp;
1239         u8 hash = ipv6_addr_hash(addr);
1240
1241         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1242                 if (!net_eq(dev_net(ifp->idev->dev), net))
1243                         continue;
1244                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1245                         if (dev == NULL || ifp->idev->dev == dev)
1246                                 break;
1247                 }
1248         }
1249         return ifp != NULL;
1250 }
1251
1252 int ipv6_chk_prefix(struct in6_addr *addr, struct net_device *dev)
1253 {
1254         struct inet6_dev *idev;
1255         struct inet6_ifaddr *ifa;
1256         int     onlink;
1257
1258         onlink = 0;
1259         rcu_read_lock();
1260         idev = __in6_dev_get(dev);
1261         if (idev) {
1262                 read_lock_bh(&idev->lock);
1263                 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
1264                         onlink = ipv6_prefix_equal(addr, &ifa->addr,
1265                                                    ifa->prefix_len);
1266                         if (onlink)
1267                                 break;
1268                 }
1269                 read_unlock_bh(&idev->lock);
1270         }
1271         rcu_read_unlock();
1272         return onlink;
1273 }
1274
1275 EXPORT_SYMBOL(ipv6_chk_prefix);
1276
1277 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, struct in6_addr *addr,
1278                                      struct net_device *dev, int strict)
1279 {
1280         struct inet6_ifaddr * ifp;
1281         u8 hash = ipv6_addr_hash(addr);
1282
1283         read_lock_bh(&addrconf_hash_lock);
1284         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1285                 if (!net_eq(dev_net(ifp->idev->dev), net))
1286                         continue;
1287                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1288                         if (dev == NULL || ifp->idev->dev == dev ||
1289                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1290                                 in6_ifa_hold(ifp);
1291                                 break;
1292                         }
1293                 }
1294         }
1295         read_unlock_bh(&addrconf_hash_lock);
1296
1297         return ifp;
1298 }
1299
1300 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1301 {
1302         const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
1303         const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
1304         __be32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
1305         __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1306         int sk_ipv6only = ipv6_only_sock(sk);
1307         int sk2_ipv6only = inet_v6_ipv6only(sk2);
1308         int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1309         int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1310
1311         if (!sk2_rcv_saddr && !sk_ipv6only)
1312                 return 1;
1313
1314         if (addr_type2 == IPV6_ADDR_ANY &&
1315             !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1316                 return 1;
1317
1318         if (addr_type == IPV6_ADDR_ANY &&
1319             !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1320                 return 1;
1321
1322         if (sk2_rcv_saddr6 &&
1323             ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1324                 return 1;
1325
1326         if (addr_type == IPV6_ADDR_MAPPED &&
1327             !sk2_ipv6only &&
1328             (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1329                 return 1;
1330
1331         return 0;
1332 }
1333
1334 /* Gets referenced address, destroys ifaddr */
1335
1336 static void addrconf_dad_stop(struct inet6_ifaddr *ifp)
1337 {
1338         if (ifp->flags&IFA_F_PERMANENT) {
1339                 spin_lock_bh(&ifp->lock);
1340                 addrconf_del_timer(ifp);
1341                 ifp->flags |= IFA_F_TENTATIVE;
1342                 spin_unlock_bh(&ifp->lock);
1343                 in6_ifa_put(ifp);
1344 #ifdef CONFIG_IPV6_PRIVACY
1345         } else if (ifp->flags&IFA_F_TEMPORARY) {
1346                 struct inet6_ifaddr *ifpub;
1347                 spin_lock_bh(&ifp->lock);
1348                 ifpub = ifp->ifpub;
1349                 if (ifpub) {
1350                         in6_ifa_hold(ifpub);
1351                         spin_unlock_bh(&ifp->lock);
1352                         ipv6_create_tempaddr(ifpub, ifp);
1353                         in6_ifa_put(ifpub);
1354                 } else {
1355                         spin_unlock_bh(&ifp->lock);
1356                 }
1357                 ipv6_del_addr(ifp);
1358 #endif
1359         } else
1360                 ipv6_del_addr(ifp);
1361 }
1362
1363 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1364 {
1365         if (net_ratelimit())
1366                 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1367         addrconf_dad_stop(ifp);
1368 }
1369
1370 /* Join to solicited addr multicast group. */
1371
1372 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1373 {
1374         struct in6_addr maddr;
1375
1376         if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1377                 return;
1378
1379         addrconf_addr_solict_mult(addr, &maddr);
1380         ipv6_dev_mc_inc(dev, &maddr);
1381 }
1382
1383 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1384 {
1385         struct in6_addr maddr;
1386
1387         if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1388                 return;
1389
1390         addrconf_addr_solict_mult(addr, &maddr);
1391         __ipv6_dev_mc_dec(idev, &maddr);
1392 }
1393
1394 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1395 {
1396         struct in6_addr addr;
1397         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1398         if (ipv6_addr_any(&addr))
1399                 return;
1400         ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1401 }
1402
1403 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1404 {
1405         struct in6_addr addr;
1406         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1407         if (ipv6_addr_any(&addr))
1408                 return;
1409         __ipv6_dev_ac_dec(ifp->idev, &addr);
1410 }
1411
1412 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1413 {
1414         if (dev->addr_len != ETH_ALEN)
1415                 return -1;
1416         memcpy(eui, dev->dev_addr, 3);
1417         memcpy(eui + 5, dev->dev_addr + 3, 3);
1418
1419         /*
1420          * The zSeries OSA network cards can be shared among various
1421          * OS instances, but the OSA cards have only one MAC address.
1422          * This leads to duplicate address conflicts in conjunction
1423          * with IPv6 if more than one instance uses the same card.
1424          *
1425          * The driver for these cards can deliver a unique 16-bit
1426          * identifier for each instance sharing the same card.  It is
1427          * placed instead of 0xFFFE in the interface identifier.  The
1428          * "u" bit of the interface identifier is not inverted in this
1429          * case.  Hence the resulting interface identifier has local
1430          * scope according to RFC2373.
1431          */
1432         if (dev->dev_id) {
1433                 eui[3] = (dev->dev_id >> 8) & 0xFF;
1434                 eui[4] = dev->dev_id & 0xFF;
1435         } else {
1436                 eui[3] = 0xFF;
1437                 eui[4] = 0xFE;
1438                 eui[0] ^= 2;
1439         }
1440         return 0;
1441 }
1442
1443 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1444 {
1445         /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1446         if (dev->addr_len != ARCNET_ALEN)
1447                 return -1;
1448         memset(eui, 0, 7);
1449         eui[7] = *(u8*)dev->dev_addr;
1450         return 0;
1451 }
1452
1453 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1454 {
1455         if (dev->addr_len != INFINIBAND_ALEN)
1456                 return -1;
1457         memcpy(eui, dev->dev_addr + 12, 8);
1458         eui[0] |= 2;
1459         return 0;
1460 }
1461
1462 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1463 {
1464         switch (dev->type) {
1465         case ARPHRD_ETHER:
1466         case ARPHRD_FDDI:
1467         case ARPHRD_IEEE802_TR:
1468                 return addrconf_ifid_eui48(eui, dev);
1469         case ARPHRD_ARCNET:
1470                 return addrconf_ifid_arcnet(eui, dev);
1471         case ARPHRD_INFINIBAND:
1472                 return addrconf_ifid_infiniband(eui, dev);
1473         case ARPHRD_SIT:
1474                 if (dev->priv_flags & IFF_ISATAP)
1475                         return ipv6_isatap_eui64(eui, *(__be32 *)dev->dev_addr);
1476         }
1477         return -1;
1478 }
1479
1480 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1481 {
1482         int err = -1;
1483         struct inet6_ifaddr *ifp;
1484
1485         read_lock_bh(&idev->lock);
1486         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1487                 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1488                         memcpy(eui, ifp->addr.s6_addr+8, 8);
1489                         err = 0;
1490                         break;
1491                 }
1492         }
1493         read_unlock_bh(&idev->lock);
1494         return err;
1495 }
1496
1497 #ifdef CONFIG_IPV6_PRIVACY
1498 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1499 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1500 {
1501 regen:
1502         get_random_bytes(idev->rndid, sizeof(idev->rndid));
1503         idev->rndid[0] &= ~0x02;
1504
1505         /*
1506          * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1507          * check if generated address is not inappropriate
1508          *
1509          *  - Reserved subnet anycast (RFC 2526)
1510          *      11111101 11....11 1xxxxxxx
1511          *  - ISATAP (RFC4214) 6.1
1512          *      00-00-5E-FE-xx-xx-xx-xx
1513          *  - value 0
1514          *  - XXX: already assigned to an address on the device
1515          */
1516         if (idev->rndid[0] == 0xfd &&
1517             (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1518             (idev->rndid[7]&0x80))
1519                 goto regen;
1520         if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1521                 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1522                         goto regen;
1523                 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1524                         goto regen;
1525         }
1526
1527         return 0;
1528 }
1529
1530 static void ipv6_regen_rndid(unsigned long data)
1531 {
1532         struct inet6_dev *idev = (struct inet6_dev *) data;
1533         unsigned long expires;
1534
1535         rcu_read_lock_bh();
1536         write_lock_bh(&idev->lock);
1537
1538         if (idev->dead)
1539                 goto out;
1540
1541         if (__ipv6_regen_rndid(idev) < 0)
1542                 goto out;
1543
1544         expires = jiffies +
1545                 idev->cnf.temp_prefered_lft * HZ -
1546                 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1547         if (time_before(expires, jiffies)) {
1548                 printk(KERN_WARNING
1549                         "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1550                         idev->dev->name);
1551                 goto out;
1552         }
1553
1554         if (!mod_timer(&idev->regen_timer, expires))
1555                 in6_dev_hold(idev);
1556
1557 out:
1558         write_unlock_bh(&idev->lock);
1559         rcu_read_unlock_bh();
1560         in6_dev_put(idev);
1561 }
1562
1563 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1564         int ret = 0;
1565
1566         if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1567                 ret = __ipv6_regen_rndid(idev);
1568         return ret;
1569 }
1570 #endif
1571
1572 /*
1573  *      Add prefix route.
1574  */
1575
1576 static void
1577 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1578                       unsigned long expires, u32 flags)
1579 {
1580         struct fib6_config cfg = {
1581                 .fc_table = RT6_TABLE_PREFIX,
1582                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1583                 .fc_ifindex = dev->ifindex,
1584                 .fc_expires = expires,
1585                 .fc_dst_len = plen,
1586                 .fc_flags = RTF_UP | flags,
1587                 .fc_nlinfo.nl_net = dev_net(dev),
1588         };
1589
1590         ipv6_addr_copy(&cfg.fc_dst, pfx);
1591
1592         /* Prevent useless cloning on PtP SIT.
1593            This thing is done here expecting that the whole
1594            class of non-broadcast devices need not cloning.
1595          */
1596 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1597         if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1598                 cfg.fc_flags |= RTF_NONEXTHOP;
1599 #endif
1600
1601         ip6_route_add(&cfg);
1602 }
1603
1604 /* Create "default" multicast route to the interface */
1605
1606 static void addrconf_add_mroute(struct net_device *dev)
1607 {
1608         struct fib6_config cfg = {
1609                 .fc_table = RT6_TABLE_LOCAL,
1610                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1611                 .fc_ifindex = dev->ifindex,
1612                 .fc_dst_len = 8,
1613                 .fc_flags = RTF_UP,
1614                 .fc_nlinfo.nl_net = dev_net(dev),
1615         };
1616
1617         ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1618
1619         ip6_route_add(&cfg);
1620 }
1621
1622 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1623 static void sit_route_add(struct net_device *dev)
1624 {
1625         struct fib6_config cfg = {
1626                 .fc_table = RT6_TABLE_MAIN,
1627                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1628                 .fc_ifindex = dev->ifindex,
1629                 .fc_dst_len = 96,
1630                 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1631                 .fc_nlinfo.nl_net = dev_net(dev),
1632         };
1633
1634         /* prefix length - 96 bits "::d.d.d.d" */
1635         ip6_route_add(&cfg);
1636 }
1637 #endif
1638
1639 static void addrconf_add_lroute(struct net_device *dev)
1640 {
1641         struct in6_addr addr;
1642
1643         ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
1644         addrconf_prefix_route(&addr, 64, dev, 0, 0);
1645 }
1646
1647 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1648 {
1649         struct inet6_dev *idev;
1650
1651         ASSERT_RTNL();
1652
1653         if ((idev = ipv6_find_idev(dev)) == NULL)
1654                 return NULL;
1655
1656         /* Add default multicast route */
1657         addrconf_add_mroute(dev);
1658
1659         /* Add link local route */
1660         addrconf_add_lroute(dev);
1661         return idev;
1662 }
1663
1664 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1665 {
1666         struct prefix_info *pinfo;
1667         __u32 valid_lft;
1668         __u32 prefered_lft;
1669         int addr_type;
1670         unsigned long rt_expires;
1671         struct inet6_dev *in6_dev;
1672
1673         pinfo = (struct prefix_info *) opt;
1674
1675         if (len < sizeof(struct prefix_info)) {
1676                 ADBG(("addrconf: prefix option too short\n"));
1677                 return;
1678         }
1679
1680         /*
1681          *      Validation checks ([ADDRCONF], page 19)
1682          */
1683
1684         addr_type = ipv6_addr_type(&pinfo->prefix);
1685
1686         if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1687                 return;
1688
1689         valid_lft = ntohl(pinfo->valid);
1690         prefered_lft = ntohl(pinfo->prefered);
1691
1692         if (prefered_lft > valid_lft) {
1693                 if (net_ratelimit())
1694                         printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1695                 return;
1696         }
1697
1698         in6_dev = in6_dev_get(dev);
1699
1700         if (in6_dev == NULL) {
1701                 if (net_ratelimit())
1702                         printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1703                 return;
1704         }
1705
1706         /*
1707          *      Two things going on here:
1708          *      1) Add routes for on-link prefixes
1709          *      2) Configure prefixes with the auto flag set
1710          */
1711
1712         /* Avoid arithmetic overflow. Really, we could
1713            save rt_expires in seconds, likely valid_lft,
1714            but it would require division in fib gc, that it
1715            not good.
1716          */
1717         if (valid_lft >= 0x7FFFFFFF/HZ)
1718                 rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ);
1719         else
1720                 rt_expires = valid_lft * HZ;
1721
1722         /*
1723          * We convert this (in jiffies) to clock_t later.
1724          * Avoid arithmetic overflow there as well.
1725          * Overflow can happen only if HZ < USER_HZ.
1726          */
1727         if (HZ < USER_HZ && rt_expires > 0x7FFFFFFF / USER_HZ)
1728                 rt_expires = 0x7FFFFFFF / USER_HZ;
1729
1730         if (pinfo->onlink) {
1731                 struct rt6_info *rt;
1732                 rt = rt6_lookup(dev_net(dev), &pinfo->prefix, NULL,
1733                                 dev->ifindex, 1);
1734
1735                 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
1736                         if (rt->rt6i_flags&RTF_EXPIRES) {
1737                                 if (valid_lft == 0) {
1738                                         ip6_del_rt(rt);
1739                                         rt = NULL;
1740                                 } else {
1741                                         rt->rt6i_expires = jiffies + rt_expires;
1742                                 }
1743                         }
1744                 } else if (valid_lft) {
1745                         addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1746                                               dev, jiffies_to_clock_t(rt_expires), RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT);
1747                 }
1748                 if (rt)
1749                         dst_release(&rt->u.dst);
1750         }
1751
1752         /* Try to figure out our local address for this prefix */
1753
1754         if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1755                 struct inet6_ifaddr * ifp;
1756                 struct in6_addr addr;
1757                 int create = 0, update_lft = 0;
1758
1759                 if (pinfo->prefix_len == 64) {
1760                         memcpy(&addr, &pinfo->prefix, 8);
1761                         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1762                             ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1763                                 in6_dev_put(in6_dev);
1764                                 return;
1765                         }
1766                         goto ok;
1767                 }
1768                 if (net_ratelimit())
1769                         printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1770                                pinfo->prefix_len);
1771                 in6_dev_put(in6_dev);
1772                 return;
1773
1774 ok:
1775
1776                 ifp = ipv6_get_ifaddr(dev_net(dev), &addr, dev, 1);
1777
1778                 if (ifp == NULL && valid_lft) {
1779                         int max_addresses = in6_dev->cnf.max_addresses;
1780                         u32 addr_flags = 0;
1781
1782 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1783                         if (in6_dev->cnf.optimistic_dad &&
1784                             !ipv6_devconf.forwarding)
1785                                 addr_flags = IFA_F_OPTIMISTIC;
1786 #endif
1787
1788                         /* Do not allow to create too much of autoconfigured
1789                          * addresses; this would be too easy way to crash kernel.
1790                          */
1791                         if (!max_addresses ||
1792                             ipv6_count_addresses(in6_dev) < max_addresses)
1793                                 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1794                                                     addr_type&IPV6_ADDR_SCOPE_MASK,
1795                                                     addr_flags);
1796
1797                         if (!ifp || IS_ERR(ifp)) {
1798                                 in6_dev_put(in6_dev);
1799                                 return;
1800                         }
1801
1802                         update_lft = create = 1;
1803                         ifp->cstamp = jiffies;
1804                         addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1805                 }
1806
1807                 if (ifp) {
1808                         int flags;
1809                         unsigned long now;
1810 #ifdef CONFIG_IPV6_PRIVACY
1811                         struct inet6_ifaddr *ift;
1812 #endif
1813                         u32 stored_lft;
1814
1815                         /* update lifetime (RFC2462 5.5.3 e) */
1816                         spin_lock(&ifp->lock);
1817                         now = jiffies;
1818                         if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1819                                 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1820                         else
1821                                 stored_lft = 0;
1822                         if (!update_lft && stored_lft) {
1823                                 if (valid_lft > MIN_VALID_LIFETIME ||
1824                                     valid_lft > stored_lft)
1825                                         update_lft = 1;
1826                                 else if (stored_lft <= MIN_VALID_LIFETIME) {
1827                                         /* valid_lft <= stored_lft is always true */
1828                                         /* XXX: IPsec */
1829                                         update_lft = 0;
1830                                 } else {
1831                                         valid_lft = MIN_VALID_LIFETIME;
1832                                         if (valid_lft < prefered_lft)
1833                                                 prefered_lft = valid_lft;
1834                                         update_lft = 1;
1835                                 }
1836                         }
1837
1838                         if (update_lft) {
1839                                 ifp->valid_lft = valid_lft;
1840                                 ifp->prefered_lft = prefered_lft;
1841                                 ifp->tstamp = now;
1842                                 flags = ifp->flags;
1843                                 ifp->flags &= ~IFA_F_DEPRECATED;
1844                                 spin_unlock(&ifp->lock);
1845
1846                                 if (!(flags&IFA_F_TENTATIVE))
1847                                         ipv6_ifa_notify(0, ifp);
1848                         } else
1849                                 spin_unlock(&ifp->lock);
1850
1851 #ifdef CONFIG_IPV6_PRIVACY
1852                         read_lock_bh(&in6_dev->lock);
1853                         /* update all temporary addresses in the list */
1854                         for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1855                                 /*
1856                                  * When adjusting the lifetimes of an existing
1857                                  * temporary address, only lower the lifetimes.
1858                                  * Implementations must not increase the
1859                                  * lifetimes of an existing temporary address
1860                                  * when processing a Prefix Information Option.
1861                                  */
1862                                 spin_lock(&ift->lock);
1863                                 flags = ift->flags;
1864                                 if (ift->valid_lft > valid_lft &&
1865                                     ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1866                                         ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1867                                 if (ift->prefered_lft > prefered_lft &&
1868                                     ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1869                                         ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1870                                 spin_unlock(&ift->lock);
1871                                 if (!(flags&IFA_F_TENTATIVE))
1872                                         ipv6_ifa_notify(0, ift);
1873                         }
1874
1875                         if (create && in6_dev->cnf.use_tempaddr > 0) {
1876                                 /*
1877                                  * When a new public address is created as described in [ADDRCONF],
1878                                  * also create a new temporary address.
1879                                  */
1880                                 read_unlock_bh(&in6_dev->lock);
1881                                 ipv6_create_tempaddr(ifp, NULL);
1882                         } else {
1883                                 read_unlock_bh(&in6_dev->lock);
1884                         }
1885 #endif
1886                         in6_ifa_put(ifp);
1887                         addrconf_verify(0);
1888                 }
1889         }
1890         inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
1891         in6_dev_put(in6_dev);
1892 }
1893
1894 /*
1895  *      Set destination address.
1896  *      Special case for SIT interfaces where we create a new "virtual"
1897  *      device.
1898  */
1899 int addrconf_set_dstaddr(struct net *net, void __user *arg)
1900 {
1901         struct in6_ifreq ireq;
1902         struct net_device *dev;
1903         int err = -EINVAL;
1904
1905         rtnl_lock();
1906
1907         err = -EFAULT;
1908         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1909                 goto err_exit;
1910
1911         dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
1912
1913         err = -ENODEV;
1914         if (dev == NULL)
1915                 goto err_exit;
1916
1917 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1918         if (dev->type == ARPHRD_SIT) {
1919                 struct ifreq ifr;
1920                 mm_segment_t    oldfs;
1921                 struct ip_tunnel_parm p;
1922
1923                 err = -EADDRNOTAVAIL;
1924                 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
1925                         goto err_exit;
1926
1927                 memset(&p, 0, sizeof(p));
1928                 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
1929                 p.iph.saddr = 0;
1930                 p.iph.version = 4;
1931                 p.iph.ihl = 5;
1932                 p.iph.protocol = IPPROTO_IPV6;
1933                 p.iph.ttl = 64;
1934                 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1935
1936                 oldfs = get_fs(); set_fs(KERNEL_DS);
1937                 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
1938                 set_fs(oldfs);
1939
1940                 if (err == 0) {
1941                         err = -ENOBUFS;
1942                         dev = __dev_get_by_name(net, p.name);
1943                         if (!dev)
1944                                 goto err_exit;
1945                         err = dev_open(dev);
1946                 }
1947         }
1948 #endif
1949
1950 err_exit:
1951         rtnl_unlock();
1952         return err;
1953 }
1954
1955 /*
1956  *      Manual configuration of address on an interface
1957  */
1958 static int inet6_addr_add(struct net *net, int ifindex, struct in6_addr *pfx,
1959                           int plen, __u8 ifa_flags, __u32 prefered_lft,
1960                           __u32 valid_lft)
1961 {
1962         struct inet6_ifaddr *ifp;
1963         struct inet6_dev *idev;
1964         struct net_device *dev;
1965         int scope;
1966         u32 flags = RTF_EXPIRES;
1967
1968         ASSERT_RTNL();
1969
1970         /* check the lifetime */
1971         if (!valid_lft || prefered_lft > valid_lft)
1972                 return -EINVAL;
1973
1974         dev = __dev_get_by_index(net, ifindex);
1975         if (!dev)
1976                 return -ENODEV;
1977
1978         if ((idev = addrconf_add_dev(dev)) == NULL)
1979                 return -ENOBUFS;
1980
1981         scope = ipv6_addr_scope(pfx);
1982
1983         if (valid_lft == INFINITY_LIFE_TIME) {
1984                 ifa_flags |= IFA_F_PERMANENT;
1985                 flags = 0;
1986         } else if (valid_lft >= 0x7FFFFFFF/HZ)
1987                 valid_lft = 0x7FFFFFFF/HZ;
1988
1989         if (prefered_lft == 0)
1990                 ifa_flags |= IFA_F_DEPRECATED;
1991         else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
1992                  (prefered_lft != INFINITY_LIFE_TIME))
1993                 prefered_lft = 0x7FFFFFFF/HZ;
1994
1995         ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
1996
1997         if (!IS_ERR(ifp)) {
1998                 spin_lock_bh(&ifp->lock);
1999                 ifp->valid_lft = valid_lft;
2000                 ifp->prefered_lft = prefered_lft;
2001                 ifp->tstamp = jiffies;
2002                 spin_unlock_bh(&ifp->lock);
2003
2004                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2005                                       jiffies_to_clock_t(valid_lft * HZ), flags);
2006                 /*
2007                  * Note that section 3.1 of RFC 4429 indicates
2008                  * that the Optimistic flag should not be set for
2009                  * manually configured addresses
2010                  */
2011                 addrconf_dad_start(ifp, 0);
2012                 in6_ifa_put(ifp);
2013                 addrconf_verify(0);
2014                 return 0;
2015         }
2016
2017         return PTR_ERR(ifp);
2018 }
2019
2020 static int inet6_addr_del(struct net *net, int ifindex, struct in6_addr *pfx,
2021                           int plen)
2022 {
2023         struct inet6_ifaddr *ifp;
2024         struct inet6_dev *idev;
2025         struct net_device *dev;
2026
2027         dev = __dev_get_by_index(net, ifindex);
2028         if (!dev)
2029                 return -ENODEV;
2030
2031         if ((idev = __in6_dev_get(dev)) == NULL)
2032                 return -ENXIO;
2033
2034         read_lock_bh(&idev->lock);
2035         for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
2036                 if (ifp->prefix_len == plen &&
2037                     ipv6_addr_equal(pfx, &ifp->addr)) {
2038                         in6_ifa_hold(ifp);
2039                         read_unlock_bh(&idev->lock);
2040
2041                         ipv6_del_addr(ifp);
2042
2043                         /* If the last address is deleted administratively,
2044                            disable IPv6 on this interface.
2045                          */
2046                         if (idev->addr_list == NULL)
2047                                 addrconf_ifdown(idev->dev, 1);
2048                         return 0;
2049                 }
2050         }
2051         read_unlock_bh(&idev->lock);
2052         return -EADDRNOTAVAIL;
2053 }
2054
2055
2056 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2057 {
2058         struct in6_ifreq ireq;
2059         int err;
2060
2061         if (!capable(CAP_NET_ADMIN))
2062                 return -EPERM;
2063
2064         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2065                 return -EFAULT;
2066
2067         rtnl_lock();
2068         err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2069                              ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2070                              INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2071         rtnl_unlock();
2072         return err;
2073 }
2074
2075 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2076 {
2077         struct in6_ifreq ireq;
2078         int err;
2079
2080         if (!capable(CAP_NET_ADMIN))
2081                 return -EPERM;
2082
2083         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2084                 return -EFAULT;
2085
2086         rtnl_lock();
2087         err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2088                              ireq.ifr6_prefixlen);
2089         rtnl_unlock();
2090         return err;
2091 }
2092
2093 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2094 static void sit_add_v4_addrs(struct inet6_dev *idev)
2095 {
2096         struct inet6_ifaddr * ifp;
2097         struct in6_addr addr;
2098         struct net_device *dev;
2099         struct net *net = dev_net(idev->dev);
2100         int scope;
2101
2102         ASSERT_RTNL();
2103
2104         memset(&addr, 0, sizeof(struct in6_addr));
2105         memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2106
2107         if (idev->dev->flags&IFF_POINTOPOINT) {
2108                 addr.s6_addr32[0] = htonl(0xfe800000);
2109                 scope = IFA_LINK;
2110         } else {
2111                 scope = IPV6_ADDR_COMPATv4;
2112         }
2113
2114         if (addr.s6_addr32[3]) {
2115                 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
2116                 if (!IS_ERR(ifp)) {
2117                         spin_lock_bh(&ifp->lock);
2118                         ifp->flags &= ~IFA_F_TENTATIVE;
2119                         spin_unlock_bh(&ifp->lock);
2120                         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2121                         in6_ifa_put(ifp);
2122                 }
2123                 return;
2124         }
2125
2126         for_each_netdev(net, dev) {
2127                 struct in_device * in_dev = __in_dev_get_rtnl(dev);
2128                 if (in_dev && (dev->flags & IFF_UP)) {
2129                         struct in_ifaddr * ifa;
2130
2131                         int flag = scope;
2132
2133                         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2134                                 int plen;
2135
2136                                 addr.s6_addr32[3] = ifa->ifa_local;
2137
2138                                 if (ifa->ifa_scope == RT_SCOPE_LINK)
2139                                         continue;
2140                                 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2141                                         if (idev->dev->flags&IFF_POINTOPOINT)
2142                                                 continue;
2143                                         flag |= IFA_HOST;
2144                                 }
2145                                 if (idev->dev->flags&IFF_POINTOPOINT)
2146                                         plen = 64;
2147                                 else
2148                                         plen = 96;
2149
2150                                 ifp = ipv6_add_addr(idev, &addr, plen, flag,
2151                                                     IFA_F_PERMANENT);
2152                                 if (!IS_ERR(ifp)) {
2153                                         spin_lock_bh(&ifp->lock);
2154                                         ifp->flags &= ~IFA_F_TENTATIVE;
2155                                         spin_unlock_bh(&ifp->lock);
2156                                         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2157                                         in6_ifa_put(ifp);
2158                                 }
2159                         }
2160                 }
2161         }
2162 }
2163 #endif
2164
2165 static void init_loopback(struct net_device *dev)
2166 {
2167         struct inet6_dev  *idev;
2168         struct inet6_ifaddr * ifp;
2169
2170         /* ::1 */
2171
2172         ASSERT_RTNL();
2173
2174         if ((idev = ipv6_find_idev(dev)) == NULL) {
2175                 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2176                 return;
2177         }
2178
2179         ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
2180         if (!IS_ERR(ifp)) {
2181                 spin_lock_bh(&ifp->lock);
2182                 ifp->flags &= ~IFA_F_TENTATIVE;
2183                 spin_unlock_bh(&ifp->lock);
2184                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2185                 in6_ifa_put(ifp);
2186         }
2187 }
2188
2189 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2190 {
2191         struct inet6_ifaddr * ifp;
2192         u32 addr_flags = IFA_F_PERMANENT;
2193
2194 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2195         if (idev->cnf.optimistic_dad &&
2196             !ipv6_devconf.forwarding)
2197                 addr_flags |= IFA_F_OPTIMISTIC;
2198 #endif
2199
2200
2201         ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2202         if (!IS_ERR(ifp)) {
2203                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2204                 addrconf_dad_start(ifp, 0);
2205                 in6_ifa_put(ifp);
2206         }
2207 }
2208
2209 static void addrconf_dev_config(struct net_device *dev)
2210 {
2211         struct in6_addr addr;
2212         struct inet6_dev    * idev;
2213
2214         ASSERT_RTNL();
2215
2216         if ((dev->type != ARPHRD_ETHER) &&
2217             (dev->type != ARPHRD_FDDI) &&
2218             (dev->type != ARPHRD_IEEE802_TR) &&
2219             (dev->type != ARPHRD_ARCNET) &&
2220             (dev->type != ARPHRD_INFINIBAND)) {
2221                 /* Alas, we support only Ethernet autoconfiguration. */
2222                 return;
2223         }
2224
2225         idev = addrconf_add_dev(dev);
2226         if (idev == NULL)
2227                 return;
2228
2229         memset(&addr, 0, sizeof(struct in6_addr));
2230         addr.s6_addr32[0] = htonl(0xFE800000);
2231
2232         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2233                 addrconf_add_linklocal(idev, &addr);
2234 }
2235
2236 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2237 static void addrconf_sit_config(struct net_device *dev)
2238 {
2239         struct inet6_dev *idev;
2240
2241         ASSERT_RTNL();
2242
2243         /*
2244          * Configure the tunnel with one of our IPv4
2245          * addresses... we should configure all of
2246          * our v4 addrs in the tunnel
2247          */
2248
2249         if ((idev = ipv6_find_idev(dev)) == NULL) {
2250                 printk(KERN_DEBUG "init sit: add_dev failed\n");
2251                 return;
2252         }
2253
2254         if (dev->priv_flags & IFF_ISATAP) {
2255                 struct in6_addr addr;
2256
2257                 ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
2258                 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2259                 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2260                         addrconf_add_linklocal(idev, &addr);
2261                 return;
2262         }
2263
2264         sit_add_v4_addrs(idev);
2265
2266         if (dev->flags&IFF_POINTOPOINT) {
2267                 addrconf_add_mroute(dev);
2268                 addrconf_add_lroute(dev);
2269         } else
2270                 sit_route_add(dev);
2271 }
2272 #endif
2273
2274 static inline int
2275 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2276 {
2277         struct in6_addr lladdr;
2278
2279         if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2280                 addrconf_add_linklocal(idev, &lladdr);
2281                 return 0;
2282         }
2283         return -1;
2284 }
2285
2286 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2287 {
2288         struct net_device *link_dev;
2289         struct net *net = dev_net(idev->dev);
2290
2291         /* first try to inherit the link-local address from the link device */
2292         if (idev->dev->iflink &&
2293             (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
2294                 if (!ipv6_inherit_linklocal(idev, link_dev))
2295                         return;
2296         }
2297         /* then try to inherit it from any device */
2298         for_each_netdev(net, link_dev) {
2299                 if (!ipv6_inherit_linklocal(idev, link_dev))
2300                         return;
2301         }
2302         printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2303 }
2304
2305 /*
2306  * Autoconfigure tunnel with a link-local address so routing protocols,
2307  * DHCPv6, MLD etc. can be run over the virtual link
2308  */
2309
2310 static void addrconf_ip6_tnl_config(struct net_device *dev)
2311 {
2312         struct inet6_dev *idev;
2313
2314         ASSERT_RTNL();
2315
2316         if ((idev = addrconf_add_dev(dev)) == NULL) {
2317                 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2318                 return;
2319         }
2320         ip6_tnl_add_linklocal(idev);
2321 }
2322
2323 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2324                            void * data)
2325 {
2326         struct net_device *dev = (struct net_device *) data;
2327         struct inet6_dev *idev = __in6_dev_get(dev);
2328         int run_pending = 0;
2329         int err;
2330
2331         switch(event) {
2332         case NETDEV_REGISTER:
2333                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2334                         idev = ipv6_add_dev(dev);
2335                         if (!idev)
2336                                 return notifier_from_errno(-ENOMEM);
2337                 }
2338                 break;
2339         case NETDEV_UP:
2340         case NETDEV_CHANGE:
2341                 if (dev->flags & IFF_SLAVE)
2342                         break;
2343
2344                 if (event == NETDEV_UP) {
2345                         if (!addrconf_qdisc_ok(dev)) {
2346                                 /* device is not ready yet. */
2347                                 printk(KERN_INFO
2348                                         "ADDRCONF(NETDEV_UP): %s: "
2349                                         "link is not ready\n",
2350                                         dev->name);
2351                                 break;
2352                         }
2353
2354                         if (!idev && dev->mtu >= IPV6_MIN_MTU)
2355                                 idev = ipv6_add_dev(dev);
2356
2357                         if (idev)
2358                                 idev->if_flags |= IF_READY;
2359                 } else {
2360                         if (!addrconf_qdisc_ok(dev)) {
2361                                 /* device is still not ready. */
2362                                 break;
2363                         }
2364
2365                         if (idev) {
2366                                 if (idev->if_flags & IF_READY) {
2367                                         /* device is already configured. */
2368                                         break;
2369                                 }
2370                                 idev->if_flags |= IF_READY;
2371                         }
2372
2373                         printk(KERN_INFO
2374                                         "ADDRCONF(NETDEV_CHANGE): %s: "
2375                                         "link becomes ready\n",
2376                                         dev->name);
2377
2378                         run_pending = 1;
2379                 }
2380
2381                 switch(dev->type) {
2382 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2383                 case ARPHRD_SIT:
2384                         addrconf_sit_config(dev);
2385                         break;
2386 #endif
2387                 case ARPHRD_TUNNEL6:
2388                         addrconf_ip6_tnl_config(dev);
2389                         break;
2390                 case ARPHRD_LOOPBACK:
2391                         init_loopback(dev);
2392                         break;
2393
2394                 default:
2395                         addrconf_dev_config(dev);
2396                         break;
2397                 }
2398                 if (idev) {
2399                         if (run_pending)
2400                                 addrconf_dad_run(idev);
2401
2402                         /* If the MTU changed during the interface down, when the
2403                            interface up, the changed MTU must be reflected in the
2404                            idev as well as routers.
2405                          */
2406                         if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2407                                 rt6_mtu_change(dev, dev->mtu);
2408                                 idev->cnf.mtu6 = dev->mtu;
2409                         }
2410                         idev->tstamp = jiffies;
2411                         inet6_ifinfo_notify(RTM_NEWLINK, idev);
2412                         /* If the changed mtu during down is lower than IPV6_MIN_MTU
2413                            stop IPv6 on this interface.
2414                          */
2415                         if (dev->mtu < IPV6_MIN_MTU)
2416                                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2417                 }
2418                 break;
2419
2420         case NETDEV_CHANGEMTU:
2421                 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2422                         rt6_mtu_change(dev, dev->mtu);
2423                         idev->cnf.mtu6 = dev->mtu;
2424                         break;
2425                 }
2426
2427                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2428                         idev = ipv6_add_dev(dev);
2429                         if (idev)
2430                                 break;
2431                 }
2432
2433                 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2434
2435         case NETDEV_DOWN:
2436         case NETDEV_UNREGISTER:
2437                 /*
2438                  *      Remove all addresses from this interface.
2439                  */
2440                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2441                 break;
2442
2443         case NETDEV_CHANGENAME:
2444                 if (idev) {
2445                         snmp6_unregister_dev(idev);
2446                         addrconf_sysctl_unregister(idev);
2447                         addrconf_sysctl_register(idev);
2448                         err = snmp6_register_dev(idev);
2449                         if (err)
2450                                 return notifier_from_errno(err);
2451                 }
2452                 break;
2453         }
2454
2455         return NOTIFY_OK;
2456 }
2457
2458 /*
2459  *      addrconf module should be notified of a device going up
2460  */
2461 static struct notifier_block ipv6_dev_notf = {
2462         .notifier_call = addrconf_notify,
2463         .priority = 0
2464 };
2465
2466 static int addrconf_ifdown(struct net_device *dev, int how)
2467 {
2468         struct inet6_dev *idev;
2469         struct inet6_ifaddr *ifa, **bifa;
2470         struct net *net = dev_net(dev);
2471         int i;
2472
2473         ASSERT_RTNL();
2474
2475         if (dev == init_net.loopback_dev && how == 1)
2476                 how = 0;
2477
2478         rt6_ifdown(net, dev);
2479         neigh_ifdown(&nd_tbl, dev);
2480
2481         idev = __in6_dev_get(dev);
2482         if (idev == NULL)
2483                 return -ENODEV;
2484
2485         /* Step 1: remove reference to ipv6 device from parent device.
2486                    Do not dev_put!
2487          */
2488         if (how == 1) {
2489                 idev->dead = 1;
2490
2491                 /* protected by rtnl_lock */
2492                 rcu_assign_pointer(dev->ip6_ptr, NULL);
2493
2494                 /* Step 1.5: remove snmp6 entry */
2495                 snmp6_unregister_dev(idev);
2496
2497         }
2498
2499         /* Step 2: clear hash table */
2500         for (i=0; i<IN6_ADDR_HSIZE; i++) {
2501                 bifa = &inet6_addr_lst[i];
2502
2503                 write_lock_bh(&addrconf_hash_lock);
2504                 while ((ifa = *bifa) != NULL) {
2505                         if (ifa->idev == idev) {
2506                                 *bifa = ifa->lst_next;
2507                                 ifa->lst_next = NULL;
2508                                 addrconf_del_timer(ifa);
2509                                 in6_ifa_put(ifa);
2510                                 continue;
2511                         }
2512                         bifa = &ifa->lst_next;
2513                 }
2514                 write_unlock_bh(&addrconf_hash_lock);
2515         }
2516
2517         write_lock_bh(&idev->lock);
2518
2519         /* Step 3: clear flags for stateless addrconf */
2520         if (how != 1)
2521                 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2522
2523         /* Step 4: clear address list */
2524 #ifdef CONFIG_IPV6_PRIVACY
2525         if (how == 1 && del_timer(&idev->regen_timer))
2526                 in6_dev_put(idev);
2527
2528         /* clear tempaddr list */
2529         while ((ifa = idev->tempaddr_list) != NULL) {
2530                 idev->tempaddr_list = ifa->tmp_next;
2531                 ifa->tmp_next = NULL;
2532                 ifa->dead = 1;
2533                 write_unlock_bh(&idev->lock);
2534                 spin_lock_bh(&ifa->lock);
2535
2536                 if (ifa->ifpub) {
2537                         in6_ifa_put(ifa->ifpub);
2538                         ifa->ifpub = NULL;
2539                 }
2540                 spin_unlock_bh(&ifa->lock);
2541                 in6_ifa_put(ifa);
2542                 write_lock_bh(&idev->lock);
2543         }
2544 #endif
2545         while ((ifa = idev->addr_list) != NULL) {
2546                 idev->addr_list = ifa->if_next;
2547                 ifa->if_next = NULL;
2548                 ifa->dead = 1;
2549                 addrconf_del_timer(ifa);
2550                 write_unlock_bh(&idev->lock);
2551
2552                 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2553                 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2554                 in6_ifa_put(ifa);
2555
2556                 write_lock_bh(&idev->lock);
2557         }
2558         write_unlock_bh(&idev->lock);
2559
2560         /* Step 5: Discard multicast list */
2561
2562         if (how == 1)
2563                 ipv6_mc_destroy_dev(idev);
2564         else
2565                 ipv6_mc_down(idev);
2566
2567         idev->tstamp = jiffies;
2568
2569         /* Shot the device (if unregistered) */
2570
2571         if (how == 1) {
2572                 addrconf_sysctl_unregister(idev);
2573                 neigh_parms_release(&nd_tbl, idev->nd_parms);
2574                 neigh_ifdown(&nd_tbl, dev);
2575                 in6_dev_put(idev);
2576         }
2577         return 0;
2578 }
2579
2580 static void addrconf_rs_timer(unsigned long data)
2581 {
2582         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2583
2584         if (ifp->idev->cnf.forwarding)
2585                 goto out;
2586
2587         if (ifp->idev->if_flags & IF_RA_RCVD) {
2588                 /*
2589                  *      Announcement received after solicitation
2590                  *      was sent
2591                  */
2592                 goto out;
2593         }
2594
2595         spin_lock(&ifp->lock);
2596         if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2597                 struct in6_addr all_routers;
2598
2599                 /* The wait after the last probe can be shorter */
2600                 addrconf_mod_timer(ifp, AC_RS,
2601                                    (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2602                                    ifp->idev->cnf.rtr_solicit_delay :
2603                                    ifp->idev->cnf.rtr_solicit_interval);
2604                 spin_unlock(&ifp->lock);
2605
2606                 ipv6_addr_all_routers(&all_routers);
2607
2608                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2609         } else {
2610                 spin_unlock(&ifp->lock);
2611                 /*
2612                  * Note: we do not support deprecated "all on-link"
2613                  * assumption any longer.
2614                  */
2615                 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2616                        ifp->idev->dev->name);
2617         }
2618
2619 out:
2620         in6_ifa_put(ifp);
2621 }
2622
2623 /*
2624  *      Duplicate Address Detection
2625  */
2626 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2627 {
2628         unsigned long rand_num;
2629         struct inet6_dev *idev = ifp->idev;
2630
2631         if (ifp->flags & IFA_F_OPTIMISTIC)
2632                 rand_num = 0;
2633         else
2634                 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2635
2636         ifp->probes = idev->cnf.dad_transmits;
2637         addrconf_mod_timer(ifp, AC_DAD, rand_num);
2638 }
2639
2640 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2641 {
2642         struct inet6_dev *idev = ifp->idev;
2643         struct net_device *dev = idev->dev;
2644
2645         addrconf_join_solict(dev, &ifp->addr);
2646
2647         net_srandom(ifp->addr.s6_addr32[3]);
2648
2649         read_lock_bh(&idev->lock);
2650         if (ifp->dead)
2651                 goto out;
2652         spin_lock_bh(&ifp->lock);
2653
2654         if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2655             !(ifp->flags&IFA_F_TENTATIVE) ||
2656             ifp->flags & IFA_F_NODAD) {
2657                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
2658                 spin_unlock_bh(&ifp->lock);
2659                 read_unlock_bh(&idev->lock);
2660
2661                 addrconf_dad_completed(ifp);
2662                 return;
2663         }
2664
2665         if (!(idev->if_flags & IF_READY)) {
2666                 spin_unlock_bh(&ifp->lock);
2667                 read_unlock_bh(&idev->lock);
2668                 /*
2669                  * If the defice is not ready:
2670                  * - keep it tentative if it is a permanent address.
2671                  * - otherwise, kill it.
2672                  */
2673                 in6_ifa_hold(ifp);
2674                 addrconf_dad_stop(ifp);
2675                 return;
2676         }
2677
2678         /*
2679          * Optimistic nodes can start receiving
2680          * Frames right away
2681          */
2682         if(ifp->flags & IFA_F_OPTIMISTIC)
2683                 ip6_ins_rt(ifp->rt);
2684
2685         addrconf_dad_kick(ifp);
2686         spin_unlock_bh(&ifp->lock);
2687 out:
2688         read_unlock_bh(&idev->lock);
2689 }
2690
2691 static void addrconf_dad_timer(unsigned long data)
2692 {
2693         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2694         struct inet6_dev *idev = ifp->idev;
2695         struct in6_addr unspec;
2696         struct in6_addr mcaddr;
2697
2698         read_lock_bh(&idev->lock);
2699         if (idev->dead) {
2700                 read_unlock_bh(&idev->lock);
2701                 goto out;
2702         }
2703         spin_lock_bh(&ifp->lock);
2704         if (ifp->probes == 0) {
2705                 /*
2706                  * DAD was successful
2707                  */
2708
2709                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
2710                 spin_unlock_bh(&ifp->lock);
2711                 read_unlock_bh(&idev->lock);
2712
2713                 addrconf_dad_completed(ifp);
2714
2715                 goto out;
2716         }
2717
2718         ifp->probes--;
2719         addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2720         spin_unlock_bh(&ifp->lock);
2721         read_unlock_bh(&idev->lock);
2722
2723         /* send a neighbour solicitation for our addr */
2724         memset(&unspec, 0, sizeof(unspec));
2725         addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2726         ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec);
2727 out:
2728         in6_ifa_put(ifp);
2729 }
2730
2731 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2732 {
2733         struct net_device *     dev = ifp->idev->dev;
2734
2735         /*
2736          *      Configure the address for reception. Now it is valid.
2737          */
2738
2739         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2740
2741         /* If added prefix is link local and forwarding is off,
2742            start sending router solicitations.
2743          */
2744
2745         if (ifp->idev->cnf.forwarding == 0 &&
2746             ifp->idev->cnf.rtr_solicits > 0 &&
2747             (dev->flags&IFF_LOOPBACK) == 0 &&
2748             (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2749                 struct in6_addr all_routers;
2750
2751                 ipv6_addr_all_routers(&all_routers);
2752
2753                 /*
2754                  *      If a host as already performed a random delay
2755                  *      [...] as part of DAD [...] there is no need
2756                  *      to delay again before sending the first RS
2757                  */
2758                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2759
2760                 spin_lock_bh(&ifp->lock);
2761                 ifp->probes = 1;
2762                 ifp->idev->if_flags |= IF_RS_SENT;
2763                 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2764                 spin_unlock_bh(&ifp->lock);
2765         }
2766 }
2767
2768 static void addrconf_dad_run(struct inet6_dev *idev) {
2769         struct inet6_ifaddr *ifp;
2770
2771         read_lock_bh(&idev->lock);
2772         for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2773                 spin_lock_bh(&ifp->lock);
2774                 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2775                         spin_unlock_bh(&ifp->lock);
2776                         continue;
2777                 }
2778                 spin_unlock_bh(&ifp->lock);
2779                 addrconf_dad_kick(ifp);
2780         }
2781         read_unlock_bh(&idev->lock);
2782 }
2783
2784 #ifdef CONFIG_PROC_FS
2785 struct if6_iter_state {
2786         struct seq_net_private p;
2787         int bucket;
2788 };
2789
2790 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2791 {
2792         struct inet6_ifaddr *ifa = NULL;
2793         struct if6_iter_state *state = seq->private;
2794         struct net *net = seq_file_net(seq);
2795
2796         for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2797                 ifa = inet6_addr_lst[state->bucket];
2798
2799                 while (ifa && !net_eq(dev_net(ifa->idev->dev), net))
2800                         ifa = ifa->lst_next;
2801                 if (ifa)
2802                         break;
2803         }
2804         return ifa;
2805 }
2806
2807 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2808 {
2809         struct if6_iter_state *state = seq->private;
2810         struct net *net = seq_file_net(seq);
2811
2812         ifa = ifa->lst_next;
2813 try_again:
2814         if (ifa) {
2815                 if (!net_eq(dev_net(ifa->idev->dev), net)) {
2816                         ifa = ifa->lst_next;
2817                         goto try_again;
2818                 }
2819         }
2820
2821         if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2822                 ifa = inet6_addr_lst[state->bucket];
2823                 goto try_again;
2824         }
2825
2826         return ifa;
2827 }
2828
2829 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2830 {
2831         struct inet6_ifaddr *ifa = if6_get_first(seq);
2832
2833         if (ifa)
2834                 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2835                         --pos;
2836         return pos ? NULL : ifa;
2837 }
2838
2839 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2840         __acquires(addrconf_hash_lock)
2841 {
2842         read_lock_bh(&addrconf_hash_lock);
2843         return if6_get_idx(seq, *pos);
2844 }
2845
2846 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2847 {
2848         struct inet6_ifaddr *ifa;
2849
2850         ifa = if6_get_next(seq, v);
2851         ++*pos;
2852         return ifa;
2853 }
2854
2855 static void if6_seq_stop(struct seq_file *seq, void *v)
2856         __releases(addrconf_hash_lock)
2857 {
2858         read_unlock_bh(&addrconf_hash_lock);
2859 }
2860
2861 static int if6_seq_show(struct seq_file *seq, void *v)
2862 {
2863         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2864         seq_printf(seq,
2865                    NIP6_SEQFMT " %02x %02x %02x %02x %8s\n",
2866                    NIP6(ifp->addr),
2867                    ifp->idev->dev->ifindex,
2868                    ifp->prefix_len,
2869                    ifp->scope,
2870                    ifp->flags,
2871                    ifp->idev->dev->name);
2872         return 0;
2873 }
2874
2875 static const struct seq_operations if6_seq_ops = {
2876         .start  = if6_seq_start,
2877         .next   = if6_seq_next,
2878         .show   = if6_seq_show,
2879         .stop   = if6_seq_stop,
2880 };
2881
2882 static int if6_seq_open(struct inode *inode, struct file *file)
2883 {
2884         return seq_open_net(inode, file, &if6_seq_ops,
2885                             sizeof(struct if6_iter_state));
2886 }
2887
2888 static const struct file_operations if6_fops = {
2889         .owner          = THIS_MODULE,
2890         .open           = if6_seq_open,
2891         .read           = seq_read,
2892         .llseek         = seq_lseek,
2893         .release        = seq_release_net,
2894 };
2895
2896 static int if6_proc_net_init(struct net *net)
2897 {
2898         if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
2899                 return -ENOMEM;
2900         return 0;
2901 }
2902
2903 static void if6_proc_net_exit(struct net *net)
2904 {
2905        proc_net_remove(net, "if_inet6");
2906 }
2907
2908 static struct pernet_operations if6_proc_net_ops = {
2909        .init = if6_proc_net_init,
2910        .exit = if6_proc_net_exit,
2911 };
2912
2913 int __init if6_proc_init(void)
2914 {
2915         return register_pernet_subsys(&if6_proc_net_ops);
2916 }
2917
2918 void if6_proc_exit(void)
2919 {
2920         unregister_pernet_subsys(&if6_proc_net_ops);
2921 }
2922 #endif  /* CONFIG_PROC_FS */
2923
2924 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
2925 /* Check if address is a home address configured on any interface. */
2926 int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr)
2927 {
2928         int ret = 0;
2929         struct inet6_ifaddr * ifp;
2930         u8 hash = ipv6_addr_hash(addr);
2931         read_lock_bh(&addrconf_hash_lock);
2932         for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) {
2933                 if (!net_eq(dev_net(ifp->idev->dev), net))
2934                         continue;
2935                 if (ipv6_addr_cmp(&ifp->addr, addr) == 0 &&
2936                     (ifp->flags & IFA_F_HOMEADDRESS)) {
2937                         ret = 1;
2938                         break;
2939                 }
2940         }
2941         read_unlock_bh(&addrconf_hash_lock);
2942         return ret;
2943 }
2944 #endif
2945
2946 /*
2947  *      Periodic address status verification
2948  */
2949
2950 static void addrconf_verify(unsigned long foo)
2951 {
2952         struct inet6_ifaddr *ifp;
2953         unsigned long now, next;
2954         int i;
2955
2956         spin_lock_bh(&addrconf_verify_lock);
2957         now = jiffies;
2958         next = now + ADDR_CHECK_FREQUENCY;
2959
2960         del_timer(&addr_chk_timer);
2961
2962         for (i=0; i < IN6_ADDR_HSIZE; i++) {
2963
2964 restart:
2965                 read_lock(&addrconf_hash_lock);
2966                 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
2967                         unsigned long age;
2968 #ifdef CONFIG_IPV6_PRIVACY
2969                         unsigned long regen_advance;
2970 #endif
2971
2972                         if (ifp->flags & IFA_F_PERMANENT)
2973                                 continue;
2974
2975                         spin_lock(&ifp->lock);
2976                         age = (now - ifp->tstamp) / HZ;
2977
2978 #ifdef CONFIG_IPV6_PRIVACY
2979                         regen_advance = ifp->idev->cnf.regen_max_retry *
2980                                         ifp->idev->cnf.dad_transmits *
2981                                         ifp->idev->nd_parms->retrans_time / HZ;
2982 #endif
2983
2984                         if (ifp->valid_lft != INFINITY_LIFE_TIME &&
2985                             age >= ifp->valid_lft) {
2986                                 spin_unlock(&ifp->lock);
2987                                 in6_ifa_hold(ifp);
2988                                 read_unlock(&addrconf_hash_lock);
2989                                 ipv6_del_addr(ifp);
2990                                 goto restart;
2991                         } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
2992                                 spin_unlock(&ifp->lock);
2993                                 continue;
2994                         } else if (age >= ifp->prefered_lft) {
2995                                 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
2996                                 int deprecate = 0;
2997
2998                                 if (!(ifp->flags&IFA_F_DEPRECATED)) {
2999                                         deprecate = 1;
3000                                         ifp->flags |= IFA_F_DEPRECATED;
3001                                 }
3002
3003                                 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3004                                         next = ifp->tstamp + ifp->valid_lft * HZ;
3005
3006                                 spin_unlock(&ifp->lock);
3007
3008                                 if (deprecate) {
3009                                         in6_ifa_hold(ifp);
3010                                         read_unlock(&addrconf_hash_lock);
3011
3012                                         ipv6_ifa_notify(0, ifp);
3013                                         in6_ifa_put(ifp);
3014                                         goto restart;
3015                                 }
3016 #ifdef CONFIG_IPV6_PRIVACY
3017                         } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3018                                    !(ifp->flags&IFA_F_TENTATIVE)) {
3019                                 if (age >= ifp->prefered_lft - regen_advance) {
3020                                         struct inet6_ifaddr *ifpub = ifp->ifpub;
3021                                         if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3022                                                 next = ifp->tstamp + ifp->prefered_lft * HZ;
3023                                         if (!ifp->regen_count && ifpub) {
3024                                                 ifp->regen_count++;
3025                                                 in6_ifa_hold(ifp);
3026                                                 in6_ifa_hold(ifpub);
3027                                                 spin_unlock(&ifp->lock);
3028                                                 read_unlock(&addrconf_hash_lock);
3029                                                 spin_lock(&ifpub->lock);
3030                                                 ifpub->regen_count = 0;
3031                                                 spin_unlock(&ifpub->lock);
3032                                                 ipv6_create_tempaddr(ifpub, ifp);
3033                                                 in6_ifa_put(ifpub);
3034                                                 in6_ifa_put(ifp);
3035                                                 goto restart;
3036                                         }
3037                                 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3038                                         next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3039                                 spin_unlock(&ifp->lock);
3040 #endif
3041                         } else {
3042                                 /* ifp->prefered_lft <= ifp->valid_lft */
3043                                 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3044                                         next = ifp->tstamp + ifp->prefered_lft * HZ;
3045                                 spin_unlock(&ifp->lock);
3046                         }
3047                 }
3048                 read_unlock(&addrconf_hash_lock);
3049         }
3050
3051         addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
3052         add_timer(&addr_chk_timer);
3053         spin_unlock_bh(&addrconf_verify_lock);
3054 }
3055
3056 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3057 {
3058         struct in6_addr *pfx = NULL;
3059
3060         if (addr)
3061                 pfx = nla_data(addr);
3062
3063         if (local) {
3064                 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3065                         pfx = NULL;
3066                 else
3067                         pfx = nla_data(local);
3068         }
3069
3070         return pfx;
3071 }
3072
3073 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3074         [IFA_ADDRESS]           = { .len = sizeof(struct in6_addr) },
3075         [IFA_LOCAL]             = { .len = sizeof(struct in6_addr) },
3076         [IFA_CACHEINFO]         = { .len = sizeof(struct ifa_cacheinfo) },
3077 };
3078
3079 static int
3080 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3081 {
3082         struct net *net = sock_net(skb->sk);
3083         struct ifaddrmsg *ifm;
3084         struct nlattr *tb[IFA_MAX+1];
3085         struct in6_addr *pfx;
3086         int err;
3087
3088         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3089         if (err < 0)
3090                 return err;
3091
3092         ifm = nlmsg_data(nlh);
3093         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3094         if (pfx == NULL)
3095                 return -EINVAL;
3096
3097         return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3098 }
3099
3100 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3101                              u32 prefered_lft, u32 valid_lft)
3102 {
3103         u32 flags = RTF_EXPIRES;
3104
3105         if (!valid_lft || (prefered_lft > valid_lft))
3106                 return -EINVAL;
3107
3108         if (valid_lft == INFINITY_LIFE_TIME) {
3109                 ifa_flags |= IFA_F_PERMANENT;
3110                 flags = 0;
3111         } else if (valid_lft >= 0x7FFFFFFF/HZ)
3112                 valid_lft = 0x7FFFFFFF/HZ;
3113
3114         if (prefered_lft == 0)
3115                 ifa_flags |= IFA_F_DEPRECATED;
3116         else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
3117                  (prefered_lft != INFINITY_LIFE_TIME))
3118                 prefered_lft = 0x7FFFFFFF/HZ;
3119
3120         spin_lock_bh(&ifp->lock);
3121         ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3122         ifp->tstamp = jiffies;
3123         ifp->valid_lft = valid_lft;
3124         ifp->prefered_lft = prefered_lft;
3125
3126         spin_unlock_bh(&ifp->lock);
3127         if (!(ifp->flags&IFA_F_TENTATIVE))
3128                 ipv6_ifa_notify(0, ifp);
3129
3130         addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3131                               jiffies_to_clock_t(valid_lft * HZ), flags);
3132         addrconf_verify(0);
3133
3134         return 0;
3135 }
3136
3137 static int
3138 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3139 {
3140         struct net *net = sock_net(skb->sk);
3141         struct ifaddrmsg *ifm;
3142         struct nlattr *tb[IFA_MAX+1];
3143         struct in6_addr *pfx;
3144         struct inet6_ifaddr *ifa;
3145         struct net_device *dev;
3146         u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3147         u8 ifa_flags;
3148         int err;
3149
3150         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3151         if (err < 0)
3152                 return err;
3153
3154         ifm = nlmsg_data(nlh);
3155         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3156         if (pfx == NULL)
3157                 return -EINVAL;
3158
3159         if (tb[IFA_CACHEINFO]) {
3160                 struct ifa_cacheinfo *ci;
3161
3162                 ci = nla_data(tb[IFA_CACHEINFO]);
3163                 valid_lft = ci->ifa_valid;
3164                 preferred_lft = ci->ifa_prefered;
3165         } else {
3166                 preferred_lft = INFINITY_LIFE_TIME;
3167                 valid_lft = INFINITY_LIFE_TIME;
3168         }
3169
3170         dev =  __dev_get_by_index(net, ifm->ifa_index);
3171         if (dev == NULL)
3172                 return -ENODEV;
3173
3174         /* We ignore other flags so far. */
3175         ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3176
3177         ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3178         if (ifa == NULL) {
3179                 /*
3180                  * It would be best to check for !NLM_F_CREATE here but
3181                  * userspace alreay relies on not having to provide this.
3182                  */
3183                 return inet6_addr_add(net, ifm->ifa_index, pfx,
3184                                       ifm->ifa_prefixlen, ifa_flags,
3185                                       preferred_lft, valid_lft);
3186         }
3187
3188         if (nlh->nlmsg_flags & NLM_F_EXCL ||
3189             !(nlh->nlmsg_flags & NLM_F_REPLACE))
3190                 err = -EEXIST;
3191         else
3192                 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3193
3194         in6_ifa_put(ifa);
3195
3196         return err;
3197 }
3198
3199 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3200                           u8 scope, int ifindex)
3201 {
3202         struct ifaddrmsg *ifm;
3203
3204         ifm = nlmsg_data(nlh);
3205         ifm->ifa_family = AF_INET6;
3206         ifm->ifa_prefixlen = prefixlen;
3207         ifm->ifa_flags = flags;
3208         ifm->ifa_scope = scope;
3209         ifm->ifa_index = ifindex;
3210 }
3211
3212 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3213                          unsigned long tstamp, u32 preferred, u32 valid)
3214 {
3215         struct ifa_cacheinfo ci;
3216
3217         ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3218                         + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3219         ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3220                         + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3221         ci.ifa_prefered = preferred;
3222         ci.ifa_valid = valid;
3223
3224         return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3225 }
3226
3227 static inline int rt_scope(int ifa_scope)
3228 {
3229         if (ifa_scope & IFA_HOST)
3230                 return RT_SCOPE_HOST;
3231         else if (ifa_scope & IFA_LINK)
3232                 return RT_SCOPE_LINK;
3233         else if (ifa_scope & IFA_SITE)
3234                 return RT_SCOPE_SITE;
3235         else
3236                 return RT_SCOPE_UNIVERSE;
3237 }
3238
3239 static inline int inet6_ifaddr_msgsize(void)
3240 {
3241         return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3242                + nla_total_size(16) /* IFA_ADDRESS */
3243                + nla_total_size(sizeof(struct ifa_cacheinfo));
3244 }
3245
3246 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3247                              u32 pid, u32 seq, int event, unsigned int flags)
3248 {
3249         struct nlmsghdr  *nlh;
3250         u32 preferred, valid;
3251
3252         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3253         if (nlh == NULL)
3254                 return -EMSGSIZE;
3255
3256         put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3257                       ifa->idev->dev->ifindex);
3258
3259         if (!(ifa->flags&IFA_F_PERMANENT)) {
3260                 preferred = ifa->prefered_lft;
3261                 valid = ifa->valid_lft;
3262                 if (preferred != INFINITY_LIFE_TIME) {
3263                         long tval = (jiffies - ifa->tstamp)/HZ;
3264                         preferred -= tval;
3265                         if (valid != INFINITY_LIFE_TIME)
3266                                 valid -= tval;
3267                 }
3268         } else {
3269                 preferred = INFINITY_LIFE_TIME;
3270                 valid = INFINITY_LIFE_TIME;
3271         }
3272
3273         if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3274             put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3275                 nlmsg_cancel(skb, nlh);
3276                 return -EMSGSIZE;
3277         }
3278
3279         return nlmsg_end(skb, nlh);
3280 }
3281
3282 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3283                                 u32 pid, u32 seq, int event, u16 flags)
3284 {
3285         struct nlmsghdr  *nlh;
3286         u8 scope = RT_SCOPE_UNIVERSE;
3287         int ifindex = ifmca->idev->dev->ifindex;
3288
3289         if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3290                 scope = RT_SCOPE_SITE;
3291
3292         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3293         if (nlh == NULL)
3294                 return -EMSGSIZE;
3295
3296         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3297         if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3298             put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3299                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3300                 nlmsg_cancel(skb, nlh);
3301                 return -EMSGSIZE;
3302         }
3303
3304         return nlmsg_end(skb, nlh);
3305 }
3306
3307 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3308                                 u32 pid, u32 seq, int event, unsigned int flags)
3309 {
3310         struct nlmsghdr  *nlh;
3311         u8 scope = RT_SCOPE_UNIVERSE;
3312         int ifindex = ifaca->aca_idev->dev->ifindex;
3313
3314         if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3315                 scope = RT_SCOPE_SITE;
3316
3317         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3318         if (nlh == NULL)
3319                 return -EMSGSIZE;
3320
3321         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3322         if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3323             put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3324                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3325                 nlmsg_cancel(skb, nlh);
3326                 return -EMSGSIZE;
3327         }
3328
3329         return nlmsg_end(skb, nlh);
3330 }
3331
3332 enum addr_type_t
3333 {
3334         UNICAST_ADDR,
3335         MULTICAST_ADDR,
3336         ANYCAST_ADDR,
3337 };
3338
3339 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3340                            enum addr_type_t type)
3341 {
3342         int idx, ip_idx;
3343         int s_idx, s_ip_idx;
3344         int err = 1;
3345         struct net_device *dev;
3346         struct inet6_dev *idev = NULL;
3347         struct inet6_ifaddr *ifa;
3348         struct ifmcaddr6 *ifmca;
3349         struct ifacaddr6 *ifaca;
3350         struct net *net = sock_net(skb->sk);
3351
3352         s_idx = cb->args[0];
3353         s_ip_idx = ip_idx = cb->args[1];
3354
3355         idx = 0;
3356         for_each_netdev(net, dev) {
3357                 if (idx < s_idx)
3358                         goto cont;
3359                 if (idx > s_idx)
3360                         s_ip_idx = 0;
3361                 ip_idx = 0;
3362                 if ((idev = in6_dev_get(dev)) == NULL)
3363                         goto cont;
3364                 read_lock_bh(&idev->lock);
3365                 switch (type) {
3366                 case UNICAST_ADDR:
3367                         /* unicast address incl. temp addr */
3368                         for (ifa = idev->addr_list; ifa;
3369                              ifa = ifa->if_next, ip_idx++) {
3370                                 if (ip_idx < s_ip_idx)
3371                                         continue;
3372                                 err = inet6_fill_ifaddr(skb, ifa,
3373                                                         NETLINK_CB(cb->skb).pid,
3374                                                         cb->nlh->nlmsg_seq,
3375                                                         RTM_NEWADDR,
3376                                                         NLM_F_MULTI);
3377                         }
3378                         break;
3379                 case MULTICAST_ADDR:
3380                         /* multicast address */
3381                         for (ifmca = idev->mc_list; ifmca;
3382                              ifmca = ifmca->next, ip_idx++) {
3383                                 if (ip_idx < s_ip_idx)
3384                                         continue;
3385                                 err = inet6_fill_ifmcaddr(skb, ifmca,
3386                                                           NETLINK_CB(cb->skb).pid,
3387                                                           cb->nlh->nlmsg_seq,
3388                                                           RTM_GETMULTICAST,
3389                                                           NLM_F_MULTI);
3390                         }
3391                         break;
3392                 case ANYCAST_ADDR:
3393                         /* anycast address */
3394                         for (ifaca = idev->ac_list; ifaca;
3395                              ifaca = ifaca->aca_next, ip_idx++) {
3396                                 if (ip_idx < s_ip_idx)
3397                                         continue;
3398                                 err = inet6_fill_ifacaddr(skb, ifaca,
3399                                                           NETLINK_CB(cb->skb).pid,
3400                                                           cb->nlh->nlmsg_seq,
3401                                                           RTM_GETANYCAST,
3402                                                           NLM_F_MULTI);
3403                         }
3404                         break;
3405                 default:
3406                         break;
3407                 }
3408                 read_unlock_bh(&idev->lock);
3409                 in6_dev_put(idev);
3410
3411                 if (err <= 0)
3412                         break;
3413 cont:
3414                 idx++;
3415         }
3416         cb->args[0] = idx;
3417         cb->args[1] = ip_idx;
3418         return skb->len;
3419 }
3420
3421 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3422 {
3423         enum addr_type_t type = UNICAST_ADDR;
3424
3425         return inet6_dump_addr(skb, cb, type);
3426 }
3427
3428 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3429 {
3430         enum addr_type_t type = MULTICAST_ADDR;
3431
3432         return inet6_dump_addr(skb, cb, type);
3433 }
3434
3435
3436 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3437 {
3438         enum addr_type_t type = ANYCAST_ADDR;
3439
3440         return inet6_dump_addr(skb, cb, type);
3441 }
3442
3443 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3444                              void *arg)
3445 {
3446         struct net *net = sock_net(in_skb->sk);
3447         struct ifaddrmsg *ifm;
3448         struct nlattr *tb[IFA_MAX+1];
3449         struct in6_addr *addr = NULL;
3450         struct net_device *dev = NULL;
3451         struct inet6_ifaddr *ifa;
3452         struct sk_buff *skb;
3453         int err;
3454
3455         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3456         if (err < 0)
3457                 goto errout;
3458
3459         addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3460         if (addr == NULL) {
3461                 err = -EINVAL;
3462                 goto errout;
3463         }
3464
3465         ifm = nlmsg_data(nlh);
3466         if (ifm->ifa_index)
3467                 dev = __dev_get_by_index(net, ifm->ifa_index);
3468
3469         if ((ifa = ipv6_get_ifaddr(net, addr, dev, 1)) == NULL) {
3470                 err = -EADDRNOTAVAIL;
3471                 goto errout;
3472         }
3473
3474         if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) {
3475                 err = -ENOBUFS;
3476                 goto errout_ifa;
3477         }
3478
3479         err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3480                                 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3481         if (err < 0) {
3482                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3483                 WARN_ON(err == -EMSGSIZE);
3484                 kfree_skb(skb);
3485                 goto errout_ifa;
3486         }
3487         err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
3488 errout_ifa:
3489         in6_ifa_put(ifa);
3490 errout:
3491         return err;
3492 }
3493
3494 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3495 {
3496         struct sk_buff *skb;
3497         struct net *net = dev_net(ifa->idev->dev);
3498         int err = -ENOBUFS;
3499
3500         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3501         if (skb == NULL)
3502                 goto errout;
3503
3504         err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3505         if (err < 0) {
3506                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3507                 WARN_ON(err == -EMSGSIZE);
3508                 kfree_skb(skb);
3509                 goto errout;
3510         }
3511         err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3512 errout:
3513         if (err < 0)
3514                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3515 }
3516
3517 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3518                                 __s32 *array, int bytes)
3519 {
3520         BUG_ON(bytes < (DEVCONF_MAX * 4));
3521
3522         memset(array, 0, bytes);
3523         array[DEVCONF_FORWARDING] = cnf->forwarding;
3524         array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3525         array[DEVCONF_MTU6] = cnf->mtu6;
3526         array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3527         array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3528         array[DEVCONF_AUTOCONF] = cnf->autoconf;
3529         array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3530         array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3531         array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3532         array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3533         array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3534 #ifdef CONFIG_IPV6_PRIVACY
3535         array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3536         array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3537         array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3538         array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3539         array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3540 #endif
3541         array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3542         array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3543         array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3544 #ifdef CONFIG_IPV6_ROUTER_PREF
3545         array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3546         array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
3547 #ifdef CONFIG_IPV6_ROUTE_INFO
3548         array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3549 #endif
3550 #endif
3551         array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3552         array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3553 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3554         array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3555 #endif
3556 }
3557
3558 static inline size_t inet6_if_nlmsg_size(void)
3559 {
3560         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3561                + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3562                + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3563                + nla_total_size(4) /* IFLA_MTU */
3564                + nla_total_size(4) /* IFLA_LINK */
3565                + nla_total_size( /* IFLA_PROTINFO */
3566                         nla_total_size(4) /* IFLA_INET6_FLAGS */
3567                         + nla_total_size(sizeof(struct ifla_cacheinfo))
3568                         + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3569                         + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3570                         + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
3571                  );
3572 }
3573
3574 static inline void __snmp6_fill_stats(u64 *stats, void **mib, int items,
3575                                       int bytes)
3576 {
3577         int i;
3578         int pad = bytes - sizeof(u64) * items;
3579         BUG_ON(pad < 0);
3580
3581         /* Use put_unaligned() because stats may not be aligned for u64. */
3582         put_unaligned(items, &stats[0]);
3583         for (i = 1; i < items; i++)
3584                 put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3585
3586         memset(&stats[items], 0, pad);
3587 }
3588
3589 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3590                              int bytes)
3591 {
3592         switch(attrtype) {
3593         case IFLA_INET6_STATS:
3594                 __snmp6_fill_stats(stats, (void **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes);
3595                 break;
3596         case IFLA_INET6_ICMP6STATS:
3597                 __snmp6_fill_stats(stats, (void **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
3598                 break;
3599         }
3600 }
3601
3602 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3603                              u32 pid, u32 seq, int event, unsigned int flags)
3604 {
3605         struct net_device *dev = idev->dev;
3606         struct nlattr *nla;
3607         struct ifinfomsg *hdr;
3608         struct nlmsghdr *nlh;
3609         void *protoinfo;
3610         struct ifla_cacheinfo ci;
3611
3612         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3613         if (nlh == NULL)
3614                 return -EMSGSIZE;
3615
3616         hdr = nlmsg_data(nlh);
3617         hdr->ifi_family = AF_INET6;
3618         hdr->__ifi_pad = 0;
3619         hdr->ifi_type = dev->type;
3620         hdr->ifi_index = dev->ifindex;
3621         hdr->ifi_flags = dev_get_flags(dev);
3622         hdr->ifi_change = 0;
3623
3624         NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
3625
3626         if (dev->addr_len)
3627                 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3628
3629         NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
3630         if (dev->ifindex != dev->iflink)
3631                 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
3632
3633         protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3634         if (protoinfo == NULL)
3635                 goto nla_put_failure;
3636
3637         NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
3638
3639         ci.max_reasm_len = IPV6_MAXPLEN;
3640         ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3641                     + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3642         ci.reachable_time = idev->nd_parms->reachable_time;
3643         ci.retrans_time = idev->nd_parms->retrans_time;
3644         NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3645
3646         nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3647         if (nla == NULL)
3648                 goto nla_put_failure;
3649         ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
3650
3651         /* XXX - MC not implemented */
3652
3653         nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3654         if (nla == NULL)
3655                 goto nla_put_failure;
3656         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3657
3658         nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3659         if (nla == NULL)
3660                 goto nla_put_failure;
3661         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
3662
3663         nla_nest_end(skb, protoinfo);
3664         return nlmsg_end(skb, nlh);
3665
3666 nla_put_failure:
3667         nlmsg_cancel(skb, nlh);
3668         return -EMSGSIZE;
3669 }
3670
3671 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3672 {
3673         struct net *net = sock_net(skb->sk);
3674         int idx, err;
3675         int s_idx = cb->args[0];
3676         struct net_device *dev;
3677         struct inet6_dev *idev;
3678
3679         read_lock(&dev_base_lock);
3680         idx = 0;
3681         for_each_netdev(net, dev) {
3682                 if (idx < s_idx)
3683                         goto cont;
3684                 if ((idev = in6_dev_get(dev)) == NULL)
3685                         goto cont;
3686                 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
3687                                 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
3688                 in6_dev_put(idev);
3689                 if (err <= 0)
3690                         break;
3691 cont:
3692                 idx++;
3693         }
3694         read_unlock(&dev_base_lock);
3695         cb->args[0] = idx;
3696
3697         return skb->len;
3698 }
3699
3700 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3701 {
3702         struct sk_buff *skb;
3703         struct net *net = dev_net(idev->dev);
3704         int err = -ENOBUFS;
3705
3706         skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
3707         if (skb == NULL)
3708                 goto errout;
3709
3710         err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
3711         if (err < 0) {
3712                 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3713                 WARN_ON(err == -EMSGSIZE);
3714                 kfree_skb(skb);
3715                 goto errout;
3716         }
3717         err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3718 errout:
3719         if (err < 0)
3720                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3721 }
3722
3723 static inline size_t inet6_prefix_nlmsg_size(void)
3724 {
3725         return NLMSG_ALIGN(sizeof(struct prefixmsg))
3726                + nla_total_size(sizeof(struct in6_addr))
3727                + nla_total_size(sizeof(struct prefix_cacheinfo));
3728 }
3729
3730 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
3731                              struct prefix_info *pinfo, u32 pid, u32 seq,
3732                              int event, unsigned int flags)
3733 {
3734         struct prefixmsg *pmsg;
3735         struct nlmsghdr *nlh;
3736         struct prefix_cacheinfo ci;
3737
3738         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
3739         if (nlh == NULL)
3740                 return -EMSGSIZE;
3741
3742         pmsg = nlmsg_data(nlh);
3743         pmsg->prefix_family = AF_INET6;
3744         pmsg->prefix_pad1 = 0;
3745         pmsg->prefix_pad2 = 0;
3746         pmsg->prefix_ifindex = idev->dev->ifindex;
3747         pmsg->prefix_len = pinfo->prefix_len;
3748         pmsg->prefix_type = pinfo->type;
3749         pmsg->prefix_pad3 = 0;
3750         pmsg->prefix_flags = 0;
3751         if (pinfo->onlink)
3752                 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3753         if (pinfo->autoconf)
3754                 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3755
3756         NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
3757
3758         ci.preferred_time = ntohl(pinfo->prefered);
3759         ci.valid_time = ntohl(pinfo->valid);
3760         NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
3761
3762         return nlmsg_end(skb, nlh);
3763
3764 nla_put_failure:
3765         nlmsg_cancel(skb, nlh);
3766         return -EMSGSIZE;
3767 }
3768
3769 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
3770                          struct prefix_info *pinfo)
3771 {
3772         struct sk_buff *skb;
3773         struct net *net = dev_net(idev->dev);
3774         int err = -ENOBUFS;
3775
3776         skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
3777         if (skb == NULL)
3778                 goto errout;
3779
3780         err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
3781         if (err < 0) {
3782                 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
3783                 WARN_ON(err == -EMSGSIZE);
3784                 kfree_skb(skb);
3785                 goto errout;
3786         }
3787         err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
3788 errout:
3789         if (err < 0)
3790                 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
3791 }
3792
3793 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3794 {
3795         inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3796
3797         switch (event) {
3798         case RTM_NEWADDR:
3799                 /*
3800                  * If the address was optimistic
3801                  * we inserted the route at the start of
3802                  * our DAD process, so we don't need
3803                  * to do it again
3804                  */
3805                 if (!(ifp->rt->rt6i_node))
3806                         ip6_ins_rt(ifp->rt);
3807                 if (ifp->idev->cnf.forwarding)
3808                         addrconf_join_anycast(ifp);
3809                 break;
3810         case RTM_DELADDR:
3811                 if (ifp->idev->cnf.forwarding)
3812                         addrconf_leave_anycast(ifp);
3813                 addrconf_leave_solict(ifp->idev, &ifp->addr);
3814                 dst_hold(&ifp->rt->u.dst);
3815                 if (ip6_del_rt(ifp->rt))
3816                         dst_free(&ifp->rt->u.dst);
3817                 break;
3818         }
3819 }
3820
3821 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3822 {
3823         rcu_read_lock_bh();
3824         if (likely(ifp->idev->dead == 0))
3825                 __ipv6_ifa_notify(event, ifp);
3826         rcu_read_unlock_bh();
3827 }
3828
3829 #ifdef CONFIG_SYSCTL
3830
3831 static
3832 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3833                            void __user *buffer, size_t *lenp, loff_t *ppos)
3834 {
3835         int *valp = ctl->data;
3836         int val = *valp;
3837         int ret;
3838
3839         ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3840
3841         if (write)
3842                 addrconf_fixup_forwarding(ctl, valp, val);
3843         return ret;
3844 }
3845
3846 static int addrconf_sysctl_forward_strategy(ctl_table *table,
3847                                             int __user *name, int nlen,
3848                                             void __user *oldval,
3849                                             size_t __user *oldlenp,
3850                                             void __user *newval, size_t newlen)
3851 {
3852         int *valp = table->data;
3853         int val = *valp;
3854         int new;
3855
3856         if (!newval || !newlen)
3857                 return 0;
3858         if (newlen != sizeof(int))
3859                 return -EINVAL;
3860         if (get_user(new, (int __user *)newval))
3861                 return -EFAULT;
3862         if (new == *valp)
3863                 return 0;
3864         if (oldval && oldlenp) {
3865                 size_t len;
3866                 if (get_user(len, oldlenp))
3867                         return -EFAULT;
3868                 if (len) {
3869                         if (len > table->maxlen)
3870                                 len = table->maxlen;
3871                         if (copy_to_user(oldval, valp, len))
3872                                 return -EFAULT;
3873                         if (put_user(len, oldlenp))
3874                                 return -EFAULT;
3875                 }
3876         }
3877
3878         *valp = new;
3879         addrconf_fixup_forwarding(table, valp, val);
3880         return 1;
3881 }
3882
3883 static struct addrconf_sysctl_table
3884 {
3885         struct ctl_table_header *sysctl_header;
3886         ctl_table addrconf_vars[__NET_IPV6_MAX];
3887         char *dev_name;
3888 } addrconf_sysctl __read_mostly = {
3889         .sysctl_header = NULL,
3890         .addrconf_vars = {
3891                 {
3892                         .ctl_name       =       NET_IPV6_FORWARDING,
3893                         .procname       =       "forwarding",
3894                         .data           =       &ipv6_devconf.forwarding,
3895                         .maxlen         =       sizeof(int),
3896                         .mode           =       0644,
3897                         .proc_handler   =       &addrconf_sysctl_forward,
3898                         .strategy       =       &addrconf_sysctl_forward_strategy,
3899                 },
3900                 {
3901                         .ctl_name       =       NET_IPV6_HOP_LIMIT,
3902                         .procname       =       "hop_limit",
3903                         .data           =       &ipv6_devconf.hop_limit,
3904                         .maxlen         =       sizeof(int),
3905                         .mode           =       0644,
3906                         .proc_handler   =       proc_dointvec,
3907                 },
3908                 {
3909                         .ctl_name       =       NET_IPV6_MTU,
3910                         .procname       =       "mtu",
3911                         .data           =       &ipv6_devconf.mtu6,
3912                         .maxlen         =       sizeof(int),
3913                         .mode           =       0644,
3914                         .proc_handler   =       &proc_dointvec,
3915                 },
3916                 {
3917                         .ctl_name       =       NET_IPV6_ACCEPT_RA,
3918                         .procname       =       "accept_ra",
3919                         .data           =       &ipv6_devconf.accept_ra,
3920                         .maxlen         =       sizeof(int),
3921                         .mode           =       0644,
3922                         .proc_handler   =       &proc_dointvec,
3923                 },
3924                 {
3925                         .ctl_name       =       NET_IPV6_ACCEPT_REDIRECTS,
3926                         .procname       =       "accept_redirects",
3927                         .data           =       &ipv6_devconf.accept_redirects,
3928                         .maxlen         =       sizeof(int),
3929                         .mode           =       0644,
3930                         .proc_handler   =       &proc_dointvec,
3931                 },
3932                 {
3933                         .ctl_name       =       NET_IPV6_AUTOCONF,
3934                         .procname       =       "autoconf",
3935                         .data           =       &ipv6_devconf.autoconf,
3936                         .maxlen         =       sizeof(int),
3937                         .mode           =       0644,
3938                         .proc_handler   =       &proc_dointvec,
3939                 },
3940                 {
3941                         .ctl_name       =       NET_IPV6_DAD_TRANSMITS,
3942                         .procname       =       "dad_transmits",
3943                         .data           =       &ipv6_devconf.dad_transmits,
3944                         .maxlen         =       sizeof(int),
3945                         .mode           =       0644,
3946                         .proc_handler   =       &proc_dointvec,
3947                 },
3948                 {
3949                         .ctl_name       =       NET_IPV6_RTR_SOLICITS,
3950                         .procname       =       "router_solicitations",
3951                         .data           =       &ipv6_devconf.rtr_solicits,
3952                         .maxlen         =       sizeof(int),
3953                         .mode           =       0644,
3954                         .proc_handler   =       &proc_dointvec,
3955                 },
3956                 {
3957                         .ctl_name       =       NET_IPV6_RTR_SOLICIT_INTERVAL,
3958                         .procname       =       "router_solicitation_interval",
3959                         .data           =       &ipv6_devconf.rtr_solicit_interval,
3960                         .maxlen         =       sizeof(int),
3961                         .mode           =       0644,
3962                         .proc_handler   =       &proc_dointvec_jiffies,
3963                         .strategy       =       &sysctl_jiffies,
3964                 },
3965                 {
3966                         .ctl_name       =       NET_IPV6_RTR_SOLICIT_DELAY,
3967                         .procname       =       "router_solicitation_delay",
3968                         .data           =       &ipv6_devconf.rtr_solicit_delay,
3969                         .maxlen         =       sizeof(int),
3970                         .mode           =       0644,
3971                         .proc_handler   =       &proc_dointvec_jiffies,
3972                         .strategy       =       &sysctl_jiffies,
3973                 },
3974                 {
3975                         .ctl_name       =       NET_IPV6_FORCE_MLD_VERSION,
3976                         .procname       =       "force_mld_version",
3977                         .data           =       &ipv6_devconf.force_mld_version,
3978                         .maxlen         =       sizeof(int),
3979                         .mode           =       0644,
3980                         .proc_handler   =       &proc_dointvec,
3981                 },
3982 #ifdef CONFIG_IPV6_PRIVACY
3983                 {
3984                         .ctl_name       =       NET_IPV6_USE_TEMPADDR,
3985                         .procname       =       "use_tempaddr",
3986                         .data           =       &ipv6_devconf.use_tempaddr,
3987                         .maxlen         =       sizeof(int),
3988                         .mode           =       0644,
3989                         .proc_handler   =       &proc_dointvec,
3990                 },
3991                 {
3992                         .ctl_name       =       NET_IPV6_TEMP_VALID_LFT,
3993                         .procname       =       "temp_valid_lft",
3994                         .data           =       &ipv6_devconf.temp_valid_lft,
3995                         .maxlen         =       sizeof(int),
3996                         .mode           =       0644,
3997                         .proc_handler   =       &proc_dointvec,
3998                 },
3999                 {
4000                         .ctl_name       =       NET_IPV6_TEMP_PREFERED_LFT,
4001                         .procname       =       "temp_prefered_lft",
4002                         .data           =       &ipv6_devconf.temp_prefered_lft,
4003                         .maxlen         =       sizeof(int),
4004                         .mode           =       0644,
4005                         .proc_handler   =       &proc_dointvec,
4006                 },
4007                 {
4008                         .ctl_name       =       NET_IPV6_REGEN_MAX_RETRY,
4009                         .procname       =       "regen_max_retry",
4010                         .data           =       &ipv6_devconf.regen_max_retry,
4011                         .maxlen         =       sizeof(int),
4012                         .mode           =       0644,
4013                         .proc_handler   =       &proc_dointvec,
4014                 },
4015                 {
4016                         .ctl_name       =       NET_IPV6_MAX_DESYNC_FACTOR,
4017                         .procname       =       "max_desync_factor",
4018                         .data           =       &ipv6_devconf.max_desync_factor,
4019                         .maxlen         =       sizeof(int),
4020                         .mode           =       0644,
4021                         .proc_handler   =       &proc_dointvec,
4022                 },
4023 #endif
4024                 {
4025                         .ctl_name       =       NET_IPV6_MAX_ADDRESSES,
4026                         .procname       =       "max_addresses",
4027                         .data           =       &ipv6_devconf.max_addresses,
4028                         .maxlen         =       sizeof(int),
4029                         .mode           =       0644,
4030                         .proc_handler   =       &proc_dointvec,
4031                 },
4032                 {
4033                         .ctl_name       =       NET_IPV6_ACCEPT_RA_DEFRTR,
4034                         .procname       =       "accept_ra_defrtr",
4035                         .data           =       &ipv6_devconf.accept_ra_defrtr,
4036                         .maxlen         =       sizeof(int),
4037                         .mode           =       0644,
4038                         .proc_handler   =       &proc_dointvec,
4039                 },
4040                 {
4041                         .ctl_name       =       NET_IPV6_ACCEPT_RA_PINFO,
4042                         .procname       =       "accept_ra_pinfo",
4043                         .data           =       &ipv6_devconf.accept_ra_pinfo,
4044                         .maxlen         =       sizeof(int),
4045                         .mode           =       0644,
4046                         .proc_handler   =       &proc_dointvec,
4047                 },
4048 #ifdef CONFIG_IPV6_ROUTER_PREF
4049                 {
4050                         .ctl_name       =       NET_IPV6_ACCEPT_RA_RTR_PREF,
4051                         .procname       =       "accept_ra_rtr_pref",
4052                         .data           =       &ipv6_devconf.accept_ra_rtr_pref,
4053                         .maxlen         =       sizeof(int),
4054                         .mode           =       0644,
4055                         .proc_handler   =       &proc_dointvec,
4056                 },
4057                 {
4058                         .ctl_name       =       NET_IPV6_RTR_PROBE_INTERVAL,
4059                         .procname       =       "router_probe_interval",
4060                         .data           =       &ipv6_devconf.rtr_probe_interval,
4061                         .maxlen         =       sizeof(int),
4062                         .mode           =       0644,
4063                         .proc_handler   =       &proc_dointvec_jiffies,
4064                         .strategy       =       &sysctl_jiffies,
4065                 },
4066 #ifdef CONFIG_IPV6_ROUTE_INFO
4067                 {
4068                         .ctl_name       =       NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN,
4069                         .procname       =       "accept_ra_rt_info_max_plen",
4070                         .data           =       &ipv6_devconf.accept_ra_rt_info_max_plen,
4071                         .maxlen         =       sizeof(int),
4072                         .mode           =       0644,
4073                         .proc_handler   =       &proc_dointvec,
4074                 },
4075 #endif
4076 #endif
4077                 {
4078                         .ctl_name       =       NET_IPV6_PROXY_NDP,
4079                         .procname       =       "proxy_ndp",
4080                         .data           =       &ipv6_devconf.proxy_ndp,
4081                         .maxlen         =       sizeof(int),
4082                         .mode           =       0644,
4083                         .proc_handler   =       &proc_dointvec,
4084                 },
4085                 {
4086                         .ctl_name       =       NET_IPV6_ACCEPT_SOURCE_ROUTE,
4087                         .procname       =       "accept_source_route",
4088                         .data           =       &ipv6_devconf.accept_source_route,
4089                         .maxlen         =       sizeof(int),
4090                         .mode           =       0644,
4091                         .proc_handler   =       &proc_dointvec,
4092                 },
4093 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4094                 {
4095                         .ctl_name       =       CTL_UNNUMBERED,
4096                         .procname       =       "optimistic_dad",
4097                         .data           =       &ipv6_devconf.optimistic_dad,
4098                         .maxlen         =       sizeof(int),
4099                         .mode           =       0644,
4100                         .proc_handler   =       &proc_dointvec,
4101
4102                 },
4103 #endif
4104                 {
4105                         .ctl_name       =       0,      /* sentinel */
4106                 }
4107         },
4108 };
4109
4110 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4111                 int ctl_name, struct inet6_dev *idev, struct ipv6_devconf *p)
4112 {
4113         int i;
4114         struct addrconf_sysctl_table *t;
4115
4116 #define ADDRCONF_CTL_PATH_DEV   3
4117
4118         struct ctl_path addrconf_ctl_path[] = {
4119                 { .procname = "net", .ctl_name = CTL_NET, },
4120                 { .procname = "ipv6", .ctl_name = NET_IPV6, },
4121                 { .procname = "conf", .ctl_name = NET_IPV6_CONF, },
4122                 { /* to be set */ },
4123                 { },
4124         };
4125
4126
4127         t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4128         if (t == NULL)
4129                 goto out;
4130
4131         for (i=0; t->addrconf_vars[i].data; i++) {
4132                 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
4133                 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4134                 t->addrconf_vars[i].extra2 = net;
4135         }
4136
4137         /*
4138          * Make a copy of dev_name, because '.procname' is regarded as const
4139          * by sysctl and we wouldn't want anyone to change it under our feet
4140          * (see SIOCSIFNAME).
4141          */
4142         t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4143         if (!t->dev_name)
4144                 goto free;
4145
4146         addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
4147         addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].ctl_name = ctl_name;
4148
4149         t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
4150                         t->addrconf_vars);
4151         if (t->sysctl_header == NULL)
4152                 goto free_procname;
4153
4154         p->sysctl = t;
4155         return 0;
4156
4157 free_procname:
4158         kfree(t->dev_name);
4159 free:
4160         kfree(t);
4161 out:
4162         return -ENOBUFS;
4163 }
4164
4165 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4166 {
4167         struct addrconf_sysctl_table *t;
4168
4169         if (p->sysctl == NULL)
4170                 return;
4171
4172         t = p->sysctl;
4173         p->sysctl = NULL;
4174         unregister_sysctl_table(t->sysctl_header);
4175         kfree(t->dev_name);
4176         kfree(t);
4177 }
4178
4179 static void addrconf_sysctl_register(struct inet6_dev *idev)
4180 {
4181         neigh_sysctl_register(idev->dev, idev->nd_parms, NET_IPV6,
4182                               NET_IPV6_NEIGH, "ipv6",
4183                               &ndisc_ifinfo_sysctl_change,
4184                               NULL);
4185         __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
4186                         idev->dev->ifindex, idev, &idev->cnf);
4187 }
4188
4189 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
4190 {
4191         __addrconf_sysctl_unregister(&idev->cnf);
4192         neigh_sysctl_unregister(idev->nd_parms);
4193 }
4194
4195
4196 #endif
4197
4198 static int addrconf_init_net(struct net *net)
4199 {
4200         int err;
4201         struct ipv6_devconf *all, *dflt;
4202
4203         err = -ENOMEM;
4204         all = &ipv6_devconf;
4205         dflt = &ipv6_devconf_dflt;
4206
4207         if (net != &init_net) {
4208                 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4209                 if (all == NULL)
4210                         goto err_alloc_all;
4211
4212                 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4213                 if (dflt == NULL)
4214                         goto err_alloc_dflt;
4215         }
4216
4217         net->ipv6.devconf_all = all;
4218         net->ipv6.devconf_dflt = dflt;
4219
4220 #ifdef CONFIG_SYSCTL
4221         err = __addrconf_sysctl_register(net, "all", NET_PROTO_CONF_ALL,
4222                         NULL, all);
4223         if (err < 0)
4224                 goto err_reg_all;
4225
4226         err = __addrconf_sysctl_register(net, "default", NET_PROTO_CONF_DEFAULT,
4227                         NULL, dflt);
4228         if (err < 0)
4229                 goto err_reg_dflt;
4230 #endif
4231         return 0;
4232
4233 #ifdef CONFIG_SYSCTL
4234 err_reg_dflt:
4235         __addrconf_sysctl_unregister(all);
4236 err_reg_all:
4237         kfree(dflt);
4238 #endif
4239 err_alloc_dflt:
4240         kfree(all);
4241 err_alloc_all:
4242         return err;
4243 }
4244
4245 static void addrconf_exit_net(struct net *net)
4246 {
4247 #ifdef CONFIG_SYSCTL
4248         __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4249         __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4250 #endif
4251         if (net != &init_net) {
4252                 kfree(net->ipv6.devconf_dflt);
4253                 kfree(net->ipv6.devconf_all);
4254         }
4255 }
4256
4257 static struct pernet_operations addrconf_ops = {
4258         .init = addrconf_init_net,
4259         .exit = addrconf_exit_net,
4260 };
4261
4262 /*
4263  *      Device notifier
4264  */
4265
4266 int register_inet6addr_notifier(struct notifier_block *nb)
4267 {
4268         return atomic_notifier_chain_register(&inet6addr_chain, nb);
4269 }
4270
4271 EXPORT_SYMBOL(register_inet6addr_notifier);
4272
4273 int unregister_inet6addr_notifier(struct notifier_block *nb)
4274 {
4275         return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
4276 }
4277
4278 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4279
4280
4281 static int addrconf_net_init(struct net *net)
4282 {
4283         return 0;
4284 }
4285
4286 static void addrconf_net_exit(struct net *net)
4287 {
4288         struct net_device *dev;
4289
4290         rtnl_lock();
4291         /* clean dev list */
4292         for_each_netdev(net, dev) {
4293                 if (__in6_dev_get(dev) == NULL)
4294                         continue;
4295                 addrconf_ifdown(dev, 1);
4296         }
4297         addrconf_ifdown(net->loopback_dev, 2);
4298         rtnl_unlock();
4299 }
4300
4301 static struct pernet_operations addrconf_net_ops = {
4302         .init = addrconf_net_init,
4303         .exit = addrconf_net_exit,
4304 };
4305
4306 /*
4307  *      Init / cleanup code
4308  */
4309
4310 int __init addrconf_init(void)
4311 {
4312         int err;
4313
4314         if ((err = ipv6_addr_label_init()) < 0) {
4315                 printk(KERN_CRIT "IPv6 Addrconf: cannot initialize default policy table: %d.\n",
4316                         err);
4317                 return err;
4318         }
4319
4320         register_pernet_subsys(&addrconf_ops);
4321
4322         /* The addrconf netdev notifier requires that loopback_dev
4323          * has it's ipv6 private information allocated and setup
4324          * before it can bring up and give link-local addresses
4325          * to other devices which are up.
4326          *
4327          * Unfortunately, loopback_dev is not necessarily the first
4328          * entry in the global dev_base list of net devices.  In fact,
4329          * it is likely to be the very last entry on that list.
4330          * So this causes the notifier registry below to try and
4331          * give link-local addresses to all devices besides loopback_dev
4332          * first, then loopback_dev, which cases all the non-loopback_dev
4333          * devices to fail to get a link-local address.
4334          *
4335          * So, as a temporary fix, allocate the ipv6 structure for
4336          * loopback_dev first by hand.
4337          * Longer term, all of the dependencies ipv6 has upon the loopback
4338          * device and it being up should be removed.
4339          */
4340         rtnl_lock();
4341         if (!ipv6_add_dev(init_net.loopback_dev))
4342                 err = -ENOMEM;
4343         rtnl_unlock();
4344         if (err)
4345                 goto errlo;
4346
4347         err = register_pernet_device(&addrconf_net_ops);
4348         if (err)
4349                 return err;
4350
4351         register_netdevice_notifier(&ipv6_dev_notf);
4352
4353         addrconf_verify(0);
4354
4355         err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4356         if (err < 0)
4357                 goto errout;
4358
4359         /* Only the first call to __rtnl_register can fail */
4360         __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4361         __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4362         __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4363         __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4364         __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4365
4366         ipv6_addr_label_rtnl_register();
4367
4368         return 0;
4369 errout:
4370         unregister_netdevice_notifier(&ipv6_dev_notf);
4371 errlo:
4372         unregister_pernet_subsys(&addrconf_ops);
4373
4374         return err;
4375 }
4376
4377 void addrconf_cleanup(void)
4378 {
4379         struct inet6_ifaddr *ifa;
4380         int i;
4381
4382         unregister_netdevice_notifier(&ipv6_dev_notf);
4383         unregister_pernet_device(&addrconf_net_ops);
4384
4385         unregister_pernet_subsys(&addrconf_ops);
4386
4387         rtnl_lock();
4388
4389         /*
4390          *      Check hash table.
4391          */
4392         write_lock_bh(&addrconf_hash_lock);
4393         for (i=0; i < IN6_ADDR_HSIZE; i++) {
4394                 for (ifa=inet6_addr_lst[i]; ifa; ) {
4395                         struct inet6_ifaddr *bifa;
4396
4397                         bifa = ifa;
4398                         ifa = ifa->lst_next;
4399                         printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
4400                         /* Do not free it; something is wrong.
4401                            Now we can investigate it with debugger.
4402                          */
4403                 }
4404         }
4405         write_unlock_bh(&addrconf_hash_lock);
4406
4407         del_timer(&addr_chk_timer);
4408         rtnl_unlock();
4409
4410         unregister_pernet_subsys(&addrconf_net_ops);
4411 }