[IPV6]: addrconf sparse warnings
[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->nd_net->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                         __FUNCTION__, 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                         __FUNCTION__, 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();
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(&init_net, 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
755                 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
756                 rt = rt6_lookup(&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 struct ipv6_saddr_score {
881         int             addr_type;
882         unsigned int    attrs;
883         int             matchlen;
884         int             scope;
885         unsigned int    rule;
886 };
887
888 #define IPV6_SADDR_SCORE_LOCAL          0x0001
889 #define IPV6_SADDR_SCORE_PREFERRED      0x0004
890 #define IPV6_SADDR_SCORE_HOA            0x0008
891 #define IPV6_SADDR_SCORE_OIF            0x0010
892 #define IPV6_SADDR_SCORE_LABEL          0x0020
893 #define IPV6_SADDR_SCORE_PRIVACY        0x0040
894
895 static inline int ipv6_saddr_preferred(int type)
896 {
897         if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
898                     IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
899                 return 1;
900         return 0;
901 }
902
903 int ipv6_dev_get_saddr(struct net_device *daddr_dev,
904                        struct in6_addr *daddr, struct in6_addr *saddr)
905 {
906         struct ipv6_saddr_score hiscore;
907         struct inet6_ifaddr *ifa_result = NULL;
908         int daddr_type = __ipv6_addr_type(daddr);
909         int daddr_scope = __ipv6_addr_src_scope(daddr_type);
910         int daddr_ifindex = daddr_dev ? daddr_dev->ifindex : 0;
911         u32 daddr_label = ipv6_addr_label(daddr, daddr_type, daddr_ifindex);
912         struct net_device *dev;
913
914         memset(&hiscore, 0, sizeof(hiscore));
915
916         read_lock(&dev_base_lock);
917         rcu_read_lock();
918
919         for_each_netdev(&init_net, dev) {
920                 struct inet6_dev *idev;
921                 struct inet6_ifaddr *ifa;
922
923                 /* Rule 0: Candidate Source Address (section 4)
924                  *  - multicast and link-local destination address,
925                  *    the set of candidate source address MUST only
926                  *    include addresses assigned to interfaces
927                  *    belonging to the same link as the outgoing
928                  *    interface.
929                  * (- For site-local destination addresses, the
930                  *    set of candidate source addresses MUST only
931                  *    include addresses assigned to interfaces
932                  *    belonging to the same site as the outgoing
933                  *    interface.)
934                  */
935                 if ((daddr_type & IPV6_ADDR_MULTICAST ||
936                      daddr_scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
937                     daddr_dev && dev != daddr_dev)
938                         continue;
939
940                 idev = __in6_dev_get(dev);
941                 if (!idev)
942                         continue;
943
944                 read_lock_bh(&idev->lock);
945                 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
946                         struct ipv6_saddr_score score;
947
948                         score.addr_type = __ipv6_addr_type(&ifa->addr);
949
950                         /* Rule 0:
951                          * - Tentative Address (RFC2462 section 5.4)
952                          *  - A tentative address is not considered
953                          *    "assigned to an interface" in the traditional
954                          *    sense, unless it is also flagged as optimistic.
955                          * - Candidate Source Address (section 4)
956                          *  - In any case, anycast addresses, multicast
957                          *    addresses, and the unspecified address MUST
958                          *    NOT be included in a candidate set.
959                          */
960                         if ((ifa->flags & IFA_F_TENTATIVE) &&
961                             (!(ifa->flags & IFA_F_OPTIMISTIC)))
962                                 continue;
963                         if (unlikely(score.addr_type == IPV6_ADDR_ANY ||
964                                      score.addr_type & IPV6_ADDR_MULTICAST)) {
965                                 LIMIT_NETDEBUG(KERN_DEBUG
966                                                "ADDRCONF: unspecified / multicast address "
967                                                "assigned as unicast address on %s",
968                                                dev->name);
969                                 continue;
970                         }
971
972                         score.attrs = 0;
973                         score.matchlen = 0;
974                         score.scope = 0;
975                         score.rule = 0;
976
977                         if (ifa_result == NULL) {
978                                 /* record it if the first available entry */
979                                 goto record_it;
980                         }
981
982                         /* Rule 1: Prefer same address */
983                         if (hiscore.rule < 1) {
984                                 if (ipv6_addr_equal(&ifa_result->addr, daddr))
985                                         hiscore.attrs |= IPV6_SADDR_SCORE_LOCAL;
986                                 hiscore.rule++;
987                         }
988                         if (ipv6_addr_equal(&ifa->addr, daddr)) {
989                                 score.attrs |= IPV6_SADDR_SCORE_LOCAL;
990                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)) {
991                                         score.rule = 1;
992                                         goto record_it;
993                                 }
994                         } else {
995                                 if (hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)
996                                         continue;
997                         }
998
999                         /* Rule 2: Prefer appropriate scope */
1000                         if (hiscore.rule < 2) {
1001                                 hiscore.scope = __ipv6_addr_src_scope(hiscore.addr_type);
1002                                 hiscore.rule++;
1003                         }
1004                         score.scope = __ipv6_addr_src_scope(score.addr_type);
1005                         if (hiscore.scope < score.scope) {
1006                                 if (hiscore.scope < daddr_scope) {
1007                                         score.rule = 2;
1008                                         goto record_it;
1009                                 } else
1010                                         continue;
1011                         } else if (score.scope < hiscore.scope) {
1012                                 if (score.scope < daddr_scope)
1013                                         break; /* addresses sorted by scope */
1014                                 else {
1015                                         score.rule = 2;
1016                                         goto record_it;
1017                                 }
1018                         }
1019
1020                         /* Rule 3: Avoid deprecated and optimistic addresses */
1021                         if (hiscore.rule < 3) {
1022                                 if (ipv6_saddr_preferred(hiscore.addr_type) ||
1023                                    (((ifa_result->flags &
1024                                     (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)) == 0)))
1025                                         hiscore.attrs |= IPV6_SADDR_SCORE_PREFERRED;
1026                                 hiscore.rule++;
1027                         }
1028                         if (ipv6_saddr_preferred(score.addr_type) ||
1029                            (((ifa->flags &
1030                             (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)) == 0))) {
1031                                 score.attrs |= IPV6_SADDR_SCORE_PREFERRED;
1032                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)) {
1033                                         score.rule = 3;
1034                                         goto record_it;
1035                                 }
1036                         } else {
1037                                 if (hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)
1038                                         continue;
1039                         }
1040
1041                         /* Rule 4: Prefer home address */
1042 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
1043                         if (hiscore.rule < 4) {
1044                                 if (ifa_result->flags & IFA_F_HOMEADDRESS)
1045                                         hiscore.attrs |= IPV6_SADDR_SCORE_HOA;
1046                                 hiscore.rule++;
1047                         }
1048                         if (ifa->flags & IFA_F_HOMEADDRESS) {
1049                                 score.attrs |= IPV6_SADDR_SCORE_HOA;
1050                                 if (!(ifa_result->flags & IFA_F_HOMEADDRESS)) {
1051                                         score.rule = 4;
1052                                         goto record_it;
1053                                 }
1054                         } else {
1055                                 if (hiscore.attrs & IPV6_SADDR_SCORE_HOA)
1056                                         continue;
1057                         }
1058 #else
1059                         if (hiscore.rule < 4)
1060                                 hiscore.rule++;
1061 #endif
1062
1063                         /* Rule 5: Prefer outgoing interface */
1064                         if (hiscore.rule < 5) {
1065                                 if (daddr_dev == NULL ||
1066                                     daddr_dev == ifa_result->idev->dev)
1067                                         hiscore.attrs |= IPV6_SADDR_SCORE_OIF;
1068                                 hiscore.rule++;
1069                         }
1070                         if (daddr_dev == NULL ||
1071                             daddr_dev == ifa->idev->dev) {
1072                                 score.attrs |= IPV6_SADDR_SCORE_OIF;
1073                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_OIF)) {
1074                                         score.rule = 5;
1075                                         goto record_it;
1076                                 }
1077                         } else {
1078                                 if (hiscore.attrs & IPV6_SADDR_SCORE_OIF)
1079                                         continue;
1080                         }
1081
1082                         /* Rule 6: Prefer matching label */
1083                         if (hiscore.rule < 6) {
1084                                 if (ipv6_addr_label(&ifa_result->addr,
1085                                                     hiscore.addr_type,
1086                                                     ifa_result->idev->dev->ifindex) == daddr_label)
1087                                         hiscore.attrs |= IPV6_SADDR_SCORE_LABEL;
1088                                 hiscore.rule++;
1089                         }
1090                         if (ipv6_addr_label(&ifa->addr,
1091                                             score.addr_type,
1092                                             ifa->idev->dev->ifindex) == daddr_label) {
1093                                 score.attrs |= IPV6_SADDR_SCORE_LABEL;
1094                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LABEL)) {
1095                                         score.rule = 6;
1096                                         goto record_it;
1097                                 }
1098                         } else {
1099                                 if (hiscore.attrs & IPV6_SADDR_SCORE_LABEL)
1100                                         continue;
1101                         }
1102
1103 #ifdef CONFIG_IPV6_PRIVACY
1104                         /* Rule 7: Prefer public address
1105                          * Note: prefer temprary address if use_tempaddr >= 2
1106                          */
1107                         if (hiscore.rule < 7) {
1108                                 if ((!(ifa_result->flags & IFA_F_TEMPORARY)) ^
1109                                     (ifa_result->idev->cnf.use_tempaddr >= 2))
1110                                         hiscore.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1111                                 hiscore.rule++;
1112                         }
1113                         if ((!(ifa->flags & IFA_F_TEMPORARY)) ^
1114                             (ifa->idev->cnf.use_tempaddr >= 2)) {
1115                                 score.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1116                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)) {
1117                                         score.rule = 7;
1118                                         goto record_it;
1119                                 }
1120                         } else {
1121                                 if (hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)
1122                                         continue;
1123                         }
1124 #else
1125                         if (hiscore.rule < 7)
1126                                 hiscore.rule++;
1127 #endif
1128                         /* Rule 8: Use longest matching prefix */
1129                         if (hiscore.rule < 8) {
1130                                 hiscore.matchlen = ipv6_addr_diff(&ifa_result->addr, daddr);
1131                                 hiscore.rule++;
1132                         }
1133                         score.matchlen = ipv6_addr_diff(&ifa->addr, daddr);
1134                         if (score.matchlen > hiscore.matchlen) {
1135                                 score.rule = 8;
1136                                 goto record_it;
1137                         }
1138 #if 0
1139                         else if (score.matchlen < hiscore.matchlen)
1140                                 continue;
1141 #endif
1142
1143                         /* Final Rule: choose first available one */
1144                         continue;
1145 record_it:
1146                         if (ifa_result)
1147                                 in6_ifa_put(ifa_result);
1148                         in6_ifa_hold(ifa);
1149                         ifa_result = ifa;
1150                         hiscore = score;
1151                 }
1152                 read_unlock_bh(&idev->lock);
1153         }
1154         rcu_read_unlock();
1155         read_unlock(&dev_base_lock);
1156
1157         if (!ifa_result)
1158                 return -EADDRNOTAVAIL;
1159
1160         ipv6_addr_copy(saddr, &ifa_result->addr);
1161         in6_ifa_put(ifa_result);
1162         return 0;
1163 }
1164
1165
1166 int ipv6_get_saddr(struct dst_entry *dst,
1167                    struct in6_addr *daddr, struct in6_addr *saddr)
1168 {
1169         return ipv6_dev_get_saddr(dst ? ip6_dst_idev(dst)->dev : NULL, daddr, saddr);
1170 }
1171
1172 EXPORT_SYMBOL(ipv6_get_saddr);
1173
1174 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1175                     unsigned char banned_flags)
1176 {
1177         struct inet6_dev *idev;
1178         int err = -EADDRNOTAVAIL;
1179
1180         rcu_read_lock();
1181         if ((idev = __in6_dev_get(dev)) != NULL) {
1182                 struct inet6_ifaddr *ifp;
1183
1184                 read_lock_bh(&idev->lock);
1185                 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1186                         if (ifp->scope == IFA_LINK && !(ifp->flags & banned_flags)) {
1187                                 ipv6_addr_copy(addr, &ifp->addr);
1188                                 err = 0;
1189                                 break;
1190                         }
1191                 }
1192                 read_unlock_bh(&idev->lock);
1193         }
1194         rcu_read_unlock();
1195         return err;
1196 }
1197
1198 static int ipv6_count_addresses(struct inet6_dev *idev)
1199 {
1200         int cnt = 0;
1201         struct inet6_ifaddr *ifp;
1202
1203         read_lock_bh(&idev->lock);
1204         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1205                 cnt++;
1206         read_unlock_bh(&idev->lock);
1207         return cnt;
1208 }
1209
1210 int ipv6_chk_addr(struct net *net, struct in6_addr *addr,
1211                   struct net_device *dev, int strict)
1212 {
1213         struct inet6_ifaddr * ifp;
1214         u8 hash = ipv6_addr_hash(addr);
1215
1216         read_lock_bh(&addrconf_hash_lock);
1217         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1218                 if (ifp->idev->dev->nd_net != net)
1219                         continue;
1220                 if (ipv6_addr_equal(&ifp->addr, addr) &&
1221                     !(ifp->flags&IFA_F_TENTATIVE)) {
1222                         if (dev == NULL || ifp->idev->dev == dev ||
1223                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1224                                 break;
1225                 }
1226         }
1227         read_unlock_bh(&addrconf_hash_lock);
1228         return ifp != NULL;
1229 }
1230 EXPORT_SYMBOL(ipv6_chk_addr);
1231
1232 static
1233 int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1234                        struct net_device *dev)
1235 {
1236         struct inet6_ifaddr * ifp;
1237         u8 hash = ipv6_addr_hash(addr);
1238
1239         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1240                 if (ifp->idev->dev->nd_net != net)
1241                         continue;
1242                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1243                         if (dev == NULL || ifp->idev->dev == dev)
1244                                 break;
1245                 }
1246         }
1247         return ifp != NULL;
1248 }
1249
1250 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, struct in6_addr *addr,
1251                                      struct net_device *dev, int strict)
1252 {
1253         struct inet6_ifaddr * ifp;
1254         u8 hash = ipv6_addr_hash(addr);
1255
1256         read_lock_bh(&addrconf_hash_lock);
1257         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1258                 if (ifp->idev->dev->nd_net != net)
1259                         continue;
1260                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1261                         if (dev == NULL || ifp->idev->dev == dev ||
1262                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1263                                 in6_ifa_hold(ifp);
1264                                 break;
1265                         }
1266                 }
1267         }
1268         read_unlock_bh(&addrconf_hash_lock);
1269
1270         return ifp;
1271 }
1272
1273 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1274 {
1275         const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
1276         const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
1277         __be32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
1278         __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1279         int sk_ipv6only = ipv6_only_sock(sk);
1280         int sk2_ipv6only = inet_v6_ipv6only(sk2);
1281         int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1282         int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1283
1284         if (!sk2_rcv_saddr && !sk_ipv6only)
1285                 return 1;
1286
1287         if (addr_type2 == IPV6_ADDR_ANY &&
1288             !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1289                 return 1;
1290
1291         if (addr_type == IPV6_ADDR_ANY &&
1292             !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1293                 return 1;
1294
1295         if (sk2_rcv_saddr6 &&
1296             ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1297                 return 1;
1298
1299         if (addr_type == IPV6_ADDR_MAPPED &&
1300             !sk2_ipv6only &&
1301             (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1302                 return 1;
1303
1304         return 0;
1305 }
1306
1307 /* Gets referenced address, destroys ifaddr */
1308
1309 static void addrconf_dad_stop(struct inet6_ifaddr *ifp)
1310 {
1311         if (ifp->flags&IFA_F_PERMANENT) {
1312                 spin_lock_bh(&ifp->lock);
1313                 addrconf_del_timer(ifp);
1314                 ifp->flags |= IFA_F_TENTATIVE;
1315                 spin_unlock_bh(&ifp->lock);
1316                 in6_ifa_put(ifp);
1317 #ifdef CONFIG_IPV6_PRIVACY
1318         } else if (ifp->flags&IFA_F_TEMPORARY) {
1319                 struct inet6_ifaddr *ifpub;
1320                 spin_lock_bh(&ifp->lock);
1321                 ifpub = ifp->ifpub;
1322                 if (ifpub) {
1323                         in6_ifa_hold(ifpub);
1324                         spin_unlock_bh(&ifp->lock);
1325                         ipv6_create_tempaddr(ifpub, ifp);
1326                         in6_ifa_put(ifpub);
1327                 } else {
1328                         spin_unlock_bh(&ifp->lock);
1329                 }
1330                 ipv6_del_addr(ifp);
1331 #endif
1332         } else
1333                 ipv6_del_addr(ifp);
1334 }
1335
1336 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1337 {
1338         if (net_ratelimit())
1339                 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1340         addrconf_dad_stop(ifp);
1341 }
1342
1343 /* Join to solicited addr multicast group. */
1344
1345 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1346 {
1347         struct in6_addr maddr;
1348
1349         if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1350                 return;
1351
1352         addrconf_addr_solict_mult(addr, &maddr);
1353         ipv6_dev_mc_inc(dev, &maddr);
1354 }
1355
1356 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1357 {
1358         struct in6_addr maddr;
1359
1360         if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1361                 return;
1362
1363         addrconf_addr_solict_mult(addr, &maddr);
1364         __ipv6_dev_mc_dec(idev, &maddr);
1365 }
1366
1367 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1368 {
1369         struct in6_addr addr;
1370         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1371         if (ipv6_addr_any(&addr))
1372                 return;
1373         ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1374 }
1375
1376 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1377 {
1378         struct in6_addr addr;
1379         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1380         if (ipv6_addr_any(&addr))
1381                 return;
1382         __ipv6_dev_ac_dec(ifp->idev, &addr);
1383 }
1384
1385 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1386 {
1387         if (dev->addr_len != ETH_ALEN)
1388                 return -1;
1389         memcpy(eui, dev->dev_addr, 3);
1390         memcpy(eui + 5, dev->dev_addr + 3, 3);
1391
1392         /*
1393          * The zSeries OSA network cards can be shared among various
1394          * OS instances, but the OSA cards have only one MAC address.
1395          * This leads to duplicate address conflicts in conjunction
1396          * with IPv6 if more than one instance uses the same card.
1397          *
1398          * The driver for these cards can deliver a unique 16-bit
1399          * identifier for each instance sharing the same card.  It is
1400          * placed instead of 0xFFFE in the interface identifier.  The
1401          * "u" bit of the interface identifier is not inverted in this
1402          * case.  Hence the resulting interface identifier has local
1403          * scope according to RFC2373.
1404          */
1405         if (dev->dev_id) {
1406                 eui[3] = (dev->dev_id >> 8) & 0xFF;
1407                 eui[4] = dev->dev_id & 0xFF;
1408         } else {
1409                 eui[3] = 0xFF;
1410                 eui[4] = 0xFE;
1411                 eui[0] ^= 2;
1412         }
1413         return 0;
1414 }
1415
1416 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1417 {
1418         /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1419         if (dev->addr_len != ARCNET_ALEN)
1420                 return -1;
1421         memset(eui, 0, 7);
1422         eui[7] = *(u8*)dev->dev_addr;
1423         return 0;
1424 }
1425
1426 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1427 {
1428         if (dev->addr_len != INFINIBAND_ALEN)
1429                 return -1;
1430         memcpy(eui, dev->dev_addr + 12, 8);
1431         eui[0] |= 2;
1432         return 0;
1433 }
1434
1435 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1436 {
1437         switch (dev->type) {
1438         case ARPHRD_ETHER:
1439         case ARPHRD_FDDI:
1440         case ARPHRD_IEEE802_TR:
1441                 return addrconf_ifid_eui48(eui, dev);
1442         case ARPHRD_ARCNET:
1443                 return addrconf_ifid_arcnet(eui, dev);
1444         case ARPHRD_INFINIBAND:
1445                 return addrconf_ifid_infiniband(eui, dev);
1446         case ARPHRD_SIT:
1447                 if (dev->priv_flags & IFF_ISATAP)
1448                         return ipv6_isatap_eui64(eui, *(__be32 *)dev->dev_addr);
1449         }
1450         return -1;
1451 }
1452
1453 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1454 {
1455         int err = -1;
1456         struct inet6_ifaddr *ifp;
1457
1458         read_lock_bh(&idev->lock);
1459         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1460                 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1461                         memcpy(eui, ifp->addr.s6_addr+8, 8);
1462                         err = 0;
1463                         break;
1464                 }
1465         }
1466         read_unlock_bh(&idev->lock);
1467         return err;
1468 }
1469
1470 #ifdef CONFIG_IPV6_PRIVACY
1471 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1472 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1473 {
1474 regen:
1475         get_random_bytes(idev->rndid, sizeof(idev->rndid));
1476         idev->rndid[0] &= ~0x02;
1477
1478         /*
1479          * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1480          * check if generated address is not inappropriate
1481          *
1482          *  - Reserved subnet anycast (RFC 2526)
1483          *      11111101 11....11 1xxxxxxx
1484          *  - ISATAP (RFC4214) 6.1
1485          *      00-00-5E-FE-xx-xx-xx-xx
1486          *  - value 0
1487          *  - XXX: already assigned to an address on the device
1488          */
1489         if (idev->rndid[0] == 0xfd &&
1490             (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1491             (idev->rndid[7]&0x80))
1492                 goto regen;
1493         if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1494                 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1495                         goto regen;
1496                 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1497                         goto regen;
1498         }
1499
1500         return 0;
1501 }
1502
1503 static void ipv6_regen_rndid(unsigned long data)
1504 {
1505         struct inet6_dev *idev = (struct inet6_dev *) data;
1506         unsigned long expires;
1507
1508         rcu_read_lock_bh();
1509         write_lock_bh(&idev->lock);
1510
1511         if (idev->dead)
1512                 goto out;
1513
1514         if (__ipv6_regen_rndid(idev) < 0)
1515                 goto out;
1516
1517         expires = jiffies +
1518                 idev->cnf.temp_prefered_lft * HZ -
1519                 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1520         if (time_before(expires, jiffies)) {
1521                 printk(KERN_WARNING
1522                         "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1523                         idev->dev->name);
1524                 goto out;
1525         }
1526
1527         if (!mod_timer(&idev->regen_timer, expires))
1528                 in6_dev_hold(idev);
1529
1530 out:
1531         write_unlock_bh(&idev->lock);
1532         rcu_read_unlock_bh();
1533         in6_dev_put(idev);
1534 }
1535
1536 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1537         int ret = 0;
1538
1539         if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1540                 ret = __ipv6_regen_rndid(idev);
1541         return ret;
1542 }
1543 #endif
1544
1545 /*
1546  *      Add prefix route.
1547  */
1548
1549 static void
1550 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1551                       unsigned long expires, u32 flags)
1552 {
1553         struct fib6_config cfg = {
1554                 .fc_table = RT6_TABLE_PREFIX,
1555                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1556                 .fc_ifindex = dev->ifindex,
1557                 .fc_expires = expires,
1558                 .fc_dst_len = plen,
1559                 .fc_flags = RTF_UP | flags,
1560         };
1561
1562         ipv6_addr_copy(&cfg.fc_dst, pfx);
1563
1564         /* Prevent useless cloning on PtP SIT.
1565            This thing is done here expecting that the whole
1566            class of non-broadcast devices need not cloning.
1567          */
1568 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1569         if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1570                 cfg.fc_flags |= RTF_NONEXTHOP;
1571 #endif
1572
1573         ip6_route_add(&cfg);
1574 }
1575
1576 /* Create "default" multicast route to the interface */
1577
1578 static void addrconf_add_mroute(struct net_device *dev)
1579 {
1580         struct fib6_config cfg = {
1581                 .fc_table = RT6_TABLE_LOCAL,
1582                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1583                 .fc_ifindex = dev->ifindex,
1584                 .fc_dst_len = 8,
1585                 .fc_flags = RTF_UP,
1586         };
1587
1588         ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1589
1590         ip6_route_add(&cfg);
1591 }
1592
1593 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1594 static void sit_route_add(struct net_device *dev)
1595 {
1596         struct fib6_config cfg = {
1597                 .fc_table = RT6_TABLE_MAIN,
1598                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1599                 .fc_ifindex = dev->ifindex,
1600                 .fc_dst_len = 96,
1601                 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1602         };
1603
1604         /* prefix length - 96 bits "::d.d.d.d" */
1605         ip6_route_add(&cfg);
1606 }
1607 #endif
1608
1609 static void addrconf_add_lroute(struct net_device *dev)
1610 {
1611         struct in6_addr addr;
1612
1613         ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
1614         addrconf_prefix_route(&addr, 64, dev, 0, 0);
1615 }
1616
1617 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1618 {
1619         struct inet6_dev *idev;
1620
1621         ASSERT_RTNL();
1622
1623         if ((idev = ipv6_find_idev(dev)) == NULL)
1624                 return NULL;
1625
1626         /* Add default multicast route */
1627         addrconf_add_mroute(dev);
1628
1629         /* Add link local route */
1630         addrconf_add_lroute(dev);
1631         return idev;
1632 }
1633
1634 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1635 {
1636         struct prefix_info *pinfo;
1637         __u32 valid_lft;
1638         __u32 prefered_lft;
1639         int addr_type;
1640         unsigned long rt_expires;
1641         struct inet6_dev *in6_dev;
1642
1643         pinfo = (struct prefix_info *) opt;
1644
1645         if (len < sizeof(struct prefix_info)) {
1646                 ADBG(("addrconf: prefix option too short\n"));
1647                 return;
1648         }
1649
1650         /*
1651          *      Validation checks ([ADDRCONF], page 19)
1652          */
1653
1654         addr_type = ipv6_addr_type(&pinfo->prefix);
1655
1656         if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1657                 return;
1658
1659         valid_lft = ntohl(pinfo->valid);
1660         prefered_lft = ntohl(pinfo->prefered);
1661
1662         if (prefered_lft > valid_lft) {
1663                 if (net_ratelimit())
1664                         printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1665                 return;
1666         }
1667
1668         in6_dev = in6_dev_get(dev);
1669
1670         if (in6_dev == NULL) {
1671                 if (net_ratelimit())
1672                         printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1673                 return;
1674         }
1675
1676         /*
1677          *      Two things going on here:
1678          *      1) Add routes for on-link prefixes
1679          *      2) Configure prefixes with the auto flag set
1680          */
1681
1682         /* Avoid arithmetic overflow. Really, we could
1683            save rt_expires in seconds, likely valid_lft,
1684            but it would require division in fib gc, that it
1685            not good.
1686          */
1687         if (valid_lft >= 0x7FFFFFFF/HZ)
1688                 rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ);
1689         else
1690                 rt_expires = valid_lft * HZ;
1691
1692         /*
1693          * We convert this (in jiffies) to clock_t later.
1694          * Avoid arithmetic overflow there as well.
1695          * Overflow can happen only if HZ < USER_HZ.
1696          */
1697         if (HZ < USER_HZ && rt_expires > 0x7FFFFFFF / USER_HZ)
1698                 rt_expires = 0x7FFFFFFF / USER_HZ;
1699
1700         if (pinfo->onlink) {
1701                 struct rt6_info *rt;
1702                 rt = rt6_lookup(&pinfo->prefix, NULL, dev->ifindex, 1);
1703
1704                 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
1705                         if (rt->rt6i_flags&RTF_EXPIRES) {
1706                                 if (valid_lft == 0) {
1707                                         ip6_del_rt(rt);
1708                                         rt = NULL;
1709                                 } else {
1710                                         rt->rt6i_expires = jiffies + rt_expires;
1711                                 }
1712                         }
1713                 } else if (valid_lft) {
1714                         addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1715                                               dev, jiffies_to_clock_t(rt_expires), RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT);
1716                 }
1717                 if (rt)
1718                         dst_release(&rt->u.dst);
1719         }
1720
1721         /* Try to figure out our local address for this prefix */
1722
1723         if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1724                 struct inet6_ifaddr * ifp;
1725                 struct in6_addr addr;
1726                 int create = 0, update_lft = 0;
1727
1728                 if (pinfo->prefix_len == 64) {
1729                         memcpy(&addr, &pinfo->prefix, 8);
1730                         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1731                             ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1732                                 in6_dev_put(in6_dev);
1733                                 return;
1734                         }
1735                         goto ok;
1736                 }
1737                 if (net_ratelimit())
1738                         printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1739                                pinfo->prefix_len);
1740                 in6_dev_put(in6_dev);
1741                 return;
1742
1743 ok:
1744
1745                 ifp = ipv6_get_ifaddr(&init_net, &addr, dev, 1);
1746
1747                 if (ifp == NULL && valid_lft) {
1748                         int max_addresses = in6_dev->cnf.max_addresses;
1749                         u32 addr_flags = 0;
1750
1751 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1752                         if (in6_dev->cnf.optimistic_dad &&
1753                             !ipv6_devconf.forwarding)
1754                                 addr_flags = IFA_F_OPTIMISTIC;
1755 #endif
1756
1757                         /* Do not allow to create too much of autoconfigured
1758                          * addresses; this would be too easy way to crash kernel.
1759                          */
1760                         if (!max_addresses ||
1761                             ipv6_count_addresses(in6_dev) < max_addresses)
1762                                 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1763                                                     addr_type&IPV6_ADDR_SCOPE_MASK,
1764                                                     addr_flags);
1765
1766                         if (!ifp || IS_ERR(ifp)) {
1767                                 in6_dev_put(in6_dev);
1768                                 return;
1769                         }
1770
1771                         update_lft = create = 1;
1772                         ifp->cstamp = jiffies;
1773                         addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1774                 }
1775
1776                 if (ifp) {
1777                         int flags;
1778                         unsigned long now;
1779 #ifdef CONFIG_IPV6_PRIVACY
1780                         struct inet6_ifaddr *ift;
1781 #endif
1782                         u32 stored_lft;
1783
1784                         /* update lifetime (RFC2462 5.5.3 e) */
1785                         spin_lock(&ifp->lock);
1786                         now = jiffies;
1787                         if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1788                                 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1789                         else
1790                                 stored_lft = 0;
1791                         if (!update_lft && stored_lft) {
1792                                 if (valid_lft > MIN_VALID_LIFETIME ||
1793                                     valid_lft > stored_lft)
1794                                         update_lft = 1;
1795                                 else if (stored_lft <= MIN_VALID_LIFETIME) {
1796                                         /* valid_lft <= stored_lft is always true */
1797                                         /* XXX: IPsec */
1798                                         update_lft = 0;
1799                                 } else {
1800                                         valid_lft = MIN_VALID_LIFETIME;
1801                                         if (valid_lft < prefered_lft)
1802                                                 prefered_lft = valid_lft;
1803                                         update_lft = 1;
1804                                 }
1805                         }
1806
1807                         if (update_lft) {
1808                                 ifp->valid_lft = valid_lft;
1809                                 ifp->prefered_lft = prefered_lft;
1810                                 ifp->tstamp = now;
1811                                 flags = ifp->flags;
1812                                 ifp->flags &= ~IFA_F_DEPRECATED;
1813                                 spin_unlock(&ifp->lock);
1814
1815                                 if (!(flags&IFA_F_TENTATIVE))
1816                                         ipv6_ifa_notify(0, ifp);
1817                         } else
1818                                 spin_unlock(&ifp->lock);
1819
1820 #ifdef CONFIG_IPV6_PRIVACY
1821                         read_lock_bh(&in6_dev->lock);
1822                         /* update all temporary addresses in the list */
1823                         for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1824                                 /*
1825                                  * When adjusting the lifetimes of an existing
1826                                  * temporary address, only lower the lifetimes.
1827                                  * Implementations must not increase the
1828                                  * lifetimes of an existing temporary address
1829                                  * when processing a Prefix Information Option.
1830                                  */
1831                                 spin_lock(&ift->lock);
1832                                 flags = ift->flags;
1833                                 if (ift->valid_lft > valid_lft &&
1834                                     ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1835                                         ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1836                                 if (ift->prefered_lft > prefered_lft &&
1837                                     ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1838                                         ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1839                                 spin_unlock(&ift->lock);
1840                                 if (!(flags&IFA_F_TENTATIVE))
1841                                         ipv6_ifa_notify(0, ift);
1842                         }
1843
1844                         if (create && in6_dev->cnf.use_tempaddr > 0) {
1845                                 /*
1846                                  * When a new public address is created as described in [ADDRCONF],
1847                                  * also create a new temporary address.
1848                                  */
1849                                 read_unlock_bh(&in6_dev->lock);
1850                                 ipv6_create_tempaddr(ifp, NULL);
1851                         } else {
1852                                 read_unlock_bh(&in6_dev->lock);
1853                         }
1854 #endif
1855                         in6_ifa_put(ifp);
1856                         addrconf_verify(0);
1857                 }
1858         }
1859         inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
1860         in6_dev_put(in6_dev);
1861 }
1862
1863 /*
1864  *      Set destination address.
1865  *      Special case for SIT interfaces where we create a new "virtual"
1866  *      device.
1867  */
1868 int addrconf_set_dstaddr(void __user *arg)
1869 {
1870         struct in6_ifreq ireq;
1871         struct net_device *dev;
1872         int err = -EINVAL;
1873
1874         rtnl_lock();
1875
1876         err = -EFAULT;
1877         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1878                 goto err_exit;
1879
1880         dev = __dev_get_by_index(&init_net, ireq.ifr6_ifindex);
1881
1882         err = -ENODEV;
1883         if (dev == NULL)
1884                 goto err_exit;
1885
1886 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1887         if (dev->type == ARPHRD_SIT) {
1888                 struct ifreq ifr;
1889                 mm_segment_t    oldfs;
1890                 struct ip_tunnel_parm p;
1891
1892                 err = -EADDRNOTAVAIL;
1893                 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
1894                         goto err_exit;
1895
1896                 memset(&p, 0, sizeof(p));
1897                 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
1898                 p.iph.saddr = 0;
1899                 p.iph.version = 4;
1900                 p.iph.ihl = 5;
1901                 p.iph.protocol = IPPROTO_IPV6;
1902                 p.iph.ttl = 64;
1903                 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1904
1905                 oldfs = get_fs(); set_fs(KERNEL_DS);
1906                 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
1907                 set_fs(oldfs);
1908
1909                 if (err == 0) {
1910                         err = -ENOBUFS;
1911                         if ((dev = __dev_get_by_name(&init_net, p.name)) == NULL)
1912                                 goto err_exit;
1913                         err = dev_open(dev);
1914                 }
1915         }
1916 #endif
1917
1918 err_exit:
1919         rtnl_unlock();
1920         return err;
1921 }
1922
1923 /*
1924  *      Manual configuration of address on an interface
1925  */
1926 static int inet6_addr_add(int ifindex, struct in6_addr *pfx, int plen,
1927                           __u8 ifa_flags, __u32 prefered_lft, __u32 valid_lft)
1928 {
1929         struct inet6_ifaddr *ifp;
1930         struct inet6_dev *idev;
1931         struct net_device *dev;
1932         int scope;
1933         u32 flags = RTF_EXPIRES;
1934
1935         ASSERT_RTNL();
1936
1937         /* check the lifetime */
1938         if (!valid_lft || prefered_lft > valid_lft)
1939                 return -EINVAL;
1940
1941         if ((dev = __dev_get_by_index(&init_net, ifindex)) == NULL)
1942                 return -ENODEV;
1943
1944         if ((idev = addrconf_add_dev(dev)) == NULL)
1945                 return -ENOBUFS;
1946
1947         scope = ipv6_addr_scope(pfx);
1948
1949         if (valid_lft == INFINITY_LIFE_TIME) {
1950                 ifa_flags |= IFA_F_PERMANENT;
1951                 flags = 0;
1952         } else if (valid_lft >= 0x7FFFFFFF/HZ)
1953                 valid_lft = 0x7FFFFFFF/HZ;
1954
1955         if (prefered_lft == 0)
1956                 ifa_flags |= IFA_F_DEPRECATED;
1957         else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
1958                  (prefered_lft != INFINITY_LIFE_TIME))
1959                 prefered_lft = 0x7FFFFFFF/HZ;
1960
1961         ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
1962
1963         if (!IS_ERR(ifp)) {
1964                 spin_lock_bh(&ifp->lock);
1965                 ifp->valid_lft = valid_lft;
1966                 ifp->prefered_lft = prefered_lft;
1967                 ifp->tstamp = jiffies;
1968                 spin_unlock_bh(&ifp->lock);
1969
1970                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
1971                                       jiffies_to_clock_t(valid_lft * HZ), flags);
1972                 /*
1973                  * Note that section 3.1 of RFC 4429 indicates
1974                  * that the Optimistic flag should not be set for
1975                  * manually configured addresses
1976                  */
1977                 addrconf_dad_start(ifp, 0);
1978                 in6_ifa_put(ifp);
1979                 addrconf_verify(0);
1980                 return 0;
1981         }
1982
1983         return PTR_ERR(ifp);
1984 }
1985
1986 static int inet6_addr_del(int ifindex, struct in6_addr *pfx, int plen)
1987 {
1988         struct inet6_ifaddr *ifp;
1989         struct inet6_dev *idev;
1990         struct net_device *dev;
1991
1992         if ((dev = __dev_get_by_index(&init_net, ifindex)) == NULL)
1993                 return -ENODEV;
1994
1995         if ((idev = __in6_dev_get(dev)) == NULL)
1996                 return -ENXIO;
1997
1998         read_lock_bh(&idev->lock);
1999         for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
2000                 if (ifp->prefix_len == plen &&
2001                     ipv6_addr_equal(pfx, &ifp->addr)) {
2002                         in6_ifa_hold(ifp);
2003                         read_unlock_bh(&idev->lock);
2004
2005                         ipv6_del_addr(ifp);
2006
2007                         /* If the last address is deleted administratively,
2008                            disable IPv6 on this interface.
2009                          */
2010                         if (idev->addr_list == NULL)
2011                                 addrconf_ifdown(idev->dev, 1);
2012                         return 0;
2013                 }
2014         }
2015         read_unlock_bh(&idev->lock);
2016         return -EADDRNOTAVAIL;
2017 }
2018
2019
2020 int addrconf_add_ifaddr(void __user *arg)
2021 {
2022         struct in6_ifreq ireq;
2023         int err;
2024
2025         if (!capable(CAP_NET_ADMIN))
2026                 return -EPERM;
2027
2028         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2029                 return -EFAULT;
2030
2031         rtnl_lock();
2032         err = inet6_addr_add(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen,
2033                              IFA_F_PERMANENT, INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2034         rtnl_unlock();
2035         return err;
2036 }
2037
2038 int addrconf_del_ifaddr(void __user *arg)
2039 {
2040         struct in6_ifreq ireq;
2041         int err;
2042
2043         if (!capable(CAP_NET_ADMIN))
2044                 return -EPERM;
2045
2046         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2047                 return -EFAULT;
2048
2049         rtnl_lock();
2050         err = inet6_addr_del(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
2051         rtnl_unlock();
2052         return err;
2053 }
2054
2055 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2056 static void sit_add_v4_addrs(struct inet6_dev *idev)
2057 {
2058         struct inet6_ifaddr * ifp;
2059         struct in6_addr addr;
2060         struct net_device *dev;
2061         int scope;
2062
2063         ASSERT_RTNL();
2064
2065         memset(&addr, 0, sizeof(struct in6_addr));
2066         memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2067
2068         if (idev->dev->flags&IFF_POINTOPOINT) {
2069                 addr.s6_addr32[0] = htonl(0xfe800000);
2070                 scope = IFA_LINK;
2071         } else {
2072                 scope = IPV6_ADDR_COMPATv4;
2073         }
2074
2075         if (addr.s6_addr32[3]) {
2076                 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
2077                 if (!IS_ERR(ifp)) {
2078                         spin_lock_bh(&ifp->lock);
2079                         ifp->flags &= ~IFA_F_TENTATIVE;
2080                         spin_unlock_bh(&ifp->lock);
2081                         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2082                         in6_ifa_put(ifp);
2083                 }
2084                 return;
2085         }
2086
2087         for_each_netdev(&init_net, dev) {
2088                 struct in_device * in_dev = __in_dev_get_rtnl(dev);
2089                 if (in_dev && (dev->flags & IFF_UP)) {
2090                         struct in_ifaddr * ifa;
2091
2092                         int flag = scope;
2093
2094                         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2095                                 int plen;
2096
2097                                 addr.s6_addr32[3] = ifa->ifa_local;
2098
2099                                 if (ifa->ifa_scope == RT_SCOPE_LINK)
2100                                         continue;
2101                                 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2102                                         if (idev->dev->flags&IFF_POINTOPOINT)
2103                                                 continue;
2104                                         flag |= IFA_HOST;
2105                                 }
2106                                 if (idev->dev->flags&IFF_POINTOPOINT)
2107                                         plen = 64;
2108                                 else
2109                                         plen = 96;
2110
2111                                 ifp = ipv6_add_addr(idev, &addr, plen, flag,
2112                                                     IFA_F_PERMANENT);
2113                                 if (!IS_ERR(ifp)) {
2114                                         spin_lock_bh(&ifp->lock);
2115                                         ifp->flags &= ~IFA_F_TENTATIVE;
2116                                         spin_unlock_bh(&ifp->lock);
2117                                         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2118                                         in6_ifa_put(ifp);
2119                                 }
2120                         }
2121                 }
2122         }
2123 }
2124 #endif
2125
2126 static void init_loopback(struct net_device *dev)
2127 {
2128         struct inet6_dev  *idev;
2129         struct inet6_ifaddr * ifp;
2130
2131         /* ::1 */
2132
2133         ASSERT_RTNL();
2134
2135         if ((idev = ipv6_find_idev(dev)) == NULL) {
2136                 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2137                 return;
2138         }
2139
2140         ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
2141         if (!IS_ERR(ifp)) {
2142                 spin_lock_bh(&ifp->lock);
2143                 ifp->flags &= ~IFA_F_TENTATIVE;
2144                 spin_unlock_bh(&ifp->lock);
2145                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2146                 in6_ifa_put(ifp);
2147         }
2148 }
2149
2150 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2151 {
2152         struct inet6_ifaddr * ifp;
2153         u32 addr_flags = IFA_F_PERMANENT;
2154
2155 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2156         if (idev->cnf.optimistic_dad &&
2157             !ipv6_devconf.forwarding)
2158                 addr_flags |= IFA_F_OPTIMISTIC;
2159 #endif
2160
2161
2162         ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2163         if (!IS_ERR(ifp)) {
2164                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2165                 addrconf_dad_start(ifp, 0);
2166                 in6_ifa_put(ifp);
2167         }
2168 }
2169
2170 static void addrconf_dev_config(struct net_device *dev)
2171 {
2172         struct in6_addr addr;
2173         struct inet6_dev    * idev;
2174
2175         ASSERT_RTNL();
2176
2177         if ((dev->type != ARPHRD_ETHER) &&
2178             (dev->type != ARPHRD_FDDI) &&
2179             (dev->type != ARPHRD_IEEE802_TR) &&
2180             (dev->type != ARPHRD_ARCNET) &&
2181             (dev->type != ARPHRD_INFINIBAND)) {
2182                 /* Alas, we support only Ethernet autoconfiguration. */
2183                 return;
2184         }
2185
2186         idev = addrconf_add_dev(dev);
2187         if (idev == NULL)
2188                 return;
2189
2190         memset(&addr, 0, sizeof(struct in6_addr));
2191         addr.s6_addr32[0] = htonl(0xFE800000);
2192
2193         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2194                 addrconf_add_linklocal(idev, &addr);
2195 }
2196
2197 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2198 static void addrconf_sit_config(struct net_device *dev)
2199 {
2200         struct inet6_dev *idev;
2201
2202         ASSERT_RTNL();
2203
2204         /*
2205          * Configure the tunnel with one of our IPv4
2206          * addresses... we should configure all of
2207          * our v4 addrs in the tunnel
2208          */
2209
2210         if ((idev = ipv6_find_idev(dev)) == NULL) {
2211                 printk(KERN_DEBUG "init sit: add_dev failed\n");
2212                 return;
2213         }
2214
2215         if (dev->priv_flags & IFF_ISATAP) {
2216                 struct in6_addr addr;
2217
2218                 ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
2219                 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2220                 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2221                         addrconf_add_linklocal(idev, &addr);
2222                 return;
2223         }
2224
2225         sit_add_v4_addrs(idev);
2226
2227         if (dev->flags&IFF_POINTOPOINT) {
2228                 addrconf_add_mroute(dev);
2229                 addrconf_add_lroute(dev);
2230         } else
2231                 sit_route_add(dev);
2232 }
2233 #endif
2234
2235 static inline int
2236 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2237 {
2238         struct in6_addr lladdr;
2239
2240         if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2241                 addrconf_add_linklocal(idev, &lladdr);
2242                 return 0;
2243         }
2244         return -1;
2245 }
2246
2247 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2248 {
2249         struct net_device *link_dev;
2250
2251         /* first try to inherit the link-local address from the link device */
2252         if (idev->dev->iflink &&
2253             (link_dev = __dev_get_by_index(&init_net, idev->dev->iflink))) {
2254                 if (!ipv6_inherit_linklocal(idev, link_dev))
2255                         return;
2256         }
2257         /* then try to inherit it from any device */
2258         for_each_netdev(&init_net, link_dev) {
2259                 if (!ipv6_inherit_linklocal(idev, link_dev))
2260                         return;
2261         }
2262         printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2263 }
2264
2265 /*
2266  * Autoconfigure tunnel with a link-local address so routing protocols,
2267  * DHCPv6, MLD etc. can be run over the virtual link
2268  */
2269
2270 static void addrconf_ip6_tnl_config(struct net_device *dev)
2271 {
2272         struct inet6_dev *idev;
2273
2274         ASSERT_RTNL();
2275
2276         if ((idev = addrconf_add_dev(dev)) == NULL) {
2277                 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2278                 return;
2279         }
2280         ip6_tnl_add_linklocal(idev);
2281 }
2282
2283 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2284                            void * data)
2285 {
2286         struct net_device *dev = (struct net_device *) data;
2287         struct inet6_dev *idev = __in6_dev_get(dev);
2288         int run_pending = 0;
2289         int err;
2290
2291         if (dev->nd_net != &init_net)
2292                 return NOTIFY_DONE;
2293
2294         switch(event) {
2295         case NETDEV_REGISTER:
2296                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2297                         idev = ipv6_add_dev(dev);
2298                         if (!idev)
2299                                 return notifier_from_errno(-ENOMEM);
2300                 }
2301                 break;
2302         case NETDEV_UP:
2303         case NETDEV_CHANGE:
2304                 if (dev->flags & IFF_SLAVE)
2305                         break;
2306
2307                 if (event == NETDEV_UP) {
2308                         if (!addrconf_qdisc_ok(dev)) {
2309                                 /* device is not ready yet. */
2310                                 printk(KERN_INFO
2311                                         "ADDRCONF(NETDEV_UP): %s: "
2312                                         "link is not ready\n",
2313                                         dev->name);
2314                                 break;
2315                         }
2316
2317                         if (!idev && dev->mtu >= IPV6_MIN_MTU)
2318                                 idev = ipv6_add_dev(dev);
2319
2320                         if (idev)
2321                                 idev->if_flags |= IF_READY;
2322                 } else {
2323                         if (!addrconf_qdisc_ok(dev)) {
2324                                 /* device is still not ready. */
2325                                 break;
2326                         }
2327
2328                         if (idev) {
2329                                 if (idev->if_flags & IF_READY) {
2330                                         /* device is already configured. */
2331                                         break;
2332                                 }
2333                                 idev->if_flags |= IF_READY;
2334                         }
2335
2336                         printk(KERN_INFO
2337                                         "ADDRCONF(NETDEV_CHANGE): %s: "
2338                                         "link becomes ready\n",
2339                                         dev->name);
2340
2341                         run_pending = 1;
2342                 }
2343
2344                 switch(dev->type) {
2345 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2346                 case ARPHRD_SIT:
2347                         addrconf_sit_config(dev);
2348                         break;
2349 #endif
2350                 case ARPHRD_TUNNEL6:
2351                         addrconf_ip6_tnl_config(dev);
2352                         break;
2353                 case ARPHRD_LOOPBACK:
2354                         init_loopback(dev);
2355                         break;
2356
2357                 default:
2358                         addrconf_dev_config(dev);
2359                         break;
2360                 }
2361                 if (idev) {
2362                         if (run_pending)
2363                                 addrconf_dad_run(idev);
2364
2365                         /* If the MTU changed during the interface down, when the
2366                            interface up, the changed MTU must be reflected in the
2367                            idev as well as routers.
2368                          */
2369                         if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2370                                 rt6_mtu_change(dev, dev->mtu);
2371                                 idev->cnf.mtu6 = dev->mtu;
2372                         }
2373                         idev->tstamp = jiffies;
2374                         inet6_ifinfo_notify(RTM_NEWLINK, idev);
2375                         /* If the changed mtu during down is lower than IPV6_MIN_MTU
2376                            stop IPv6 on this interface.
2377                          */
2378                         if (dev->mtu < IPV6_MIN_MTU)
2379                                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2380                 }
2381                 break;
2382
2383         case NETDEV_CHANGEMTU:
2384                 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2385                         rt6_mtu_change(dev, dev->mtu);
2386                         idev->cnf.mtu6 = dev->mtu;
2387                         break;
2388                 }
2389
2390                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2391                         idev = ipv6_add_dev(dev);
2392                         if (idev)
2393                                 break;
2394                 }
2395
2396                 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2397
2398         case NETDEV_DOWN:
2399         case NETDEV_UNREGISTER:
2400                 /*
2401                  *      Remove all addresses from this interface.
2402                  */
2403                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2404                 break;
2405
2406         case NETDEV_CHANGENAME:
2407                 if (idev) {
2408                         snmp6_unregister_dev(idev);
2409                         addrconf_sysctl_unregister(idev);
2410                         addrconf_sysctl_register(idev);
2411                         err = snmp6_register_dev(idev);
2412                         if (err)
2413                                 return notifier_from_errno(err);
2414                 }
2415                 break;
2416         }
2417
2418         return NOTIFY_OK;
2419 }
2420
2421 /*
2422  *      addrconf module should be notified of a device going up
2423  */
2424 static struct notifier_block ipv6_dev_notf = {
2425         .notifier_call = addrconf_notify,
2426         .priority = 0
2427 };
2428
2429 static int addrconf_ifdown(struct net_device *dev, int how)
2430 {
2431         struct inet6_dev *idev;
2432         struct inet6_ifaddr *ifa, **bifa;
2433         int i;
2434
2435         ASSERT_RTNL();
2436
2437         if (dev == init_net.loopback_dev && how == 1)
2438                 how = 0;
2439
2440         rt6_ifdown(dev);
2441         neigh_ifdown(&nd_tbl, dev);
2442
2443         idev = __in6_dev_get(dev);
2444         if (idev == NULL)
2445                 return -ENODEV;
2446
2447         /* Step 1: remove reference to ipv6 device from parent device.
2448                    Do not dev_put!
2449          */
2450         if (how == 1) {
2451                 idev->dead = 1;
2452
2453                 /* protected by rtnl_lock */
2454                 rcu_assign_pointer(dev->ip6_ptr, NULL);
2455
2456                 /* Step 1.5: remove snmp6 entry */
2457                 snmp6_unregister_dev(idev);
2458
2459         }
2460
2461         /* Step 2: clear hash table */
2462         for (i=0; i<IN6_ADDR_HSIZE; i++) {
2463                 bifa = &inet6_addr_lst[i];
2464
2465                 write_lock_bh(&addrconf_hash_lock);
2466                 while ((ifa = *bifa) != NULL) {
2467                         if (ifa->idev == idev) {
2468                                 *bifa = ifa->lst_next;
2469                                 ifa->lst_next = NULL;
2470                                 addrconf_del_timer(ifa);
2471                                 in6_ifa_put(ifa);
2472                                 continue;
2473                         }
2474                         bifa = &ifa->lst_next;
2475                 }
2476                 write_unlock_bh(&addrconf_hash_lock);
2477         }
2478
2479         write_lock_bh(&idev->lock);
2480
2481         /* Step 3: clear flags for stateless addrconf */
2482         if (how != 1)
2483                 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2484
2485         /* Step 4: clear address list */
2486 #ifdef CONFIG_IPV6_PRIVACY
2487         if (how == 1 && del_timer(&idev->regen_timer))
2488                 in6_dev_put(idev);
2489
2490         /* clear tempaddr list */
2491         while ((ifa = idev->tempaddr_list) != NULL) {
2492                 idev->tempaddr_list = ifa->tmp_next;
2493                 ifa->tmp_next = NULL;
2494                 ifa->dead = 1;
2495                 write_unlock_bh(&idev->lock);
2496                 spin_lock_bh(&ifa->lock);
2497
2498                 if (ifa->ifpub) {
2499                         in6_ifa_put(ifa->ifpub);
2500                         ifa->ifpub = NULL;
2501                 }
2502                 spin_unlock_bh(&ifa->lock);
2503                 in6_ifa_put(ifa);
2504                 write_lock_bh(&idev->lock);
2505         }
2506 #endif
2507         while ((ifa = idev->addr_list) != NULL) {
2508                 idev->addr_list = ifa->if_next;
2509                 ifa->if_next = NULL;
2510                 ifa->dead = 1;
2511                 addrconf_del_timer(ifa);
2512                 write_unlock_bh(&idev->lock);
2513
2514                 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2515                 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2516                 in6_ifa_put(ifa);
2517
2518                 write_lock_bh(&idev->lock);
2519         }
2520         write_unlock_bh(&idev->lock);
2521
2522         /* Step 5: Discard multicast list */
2523
2524         if (how == 1)
2525                 ipv6_mc_destroy_dev(idev);
2526         else
2527                 ipv6_mc_down(idev);
2528
2529         idev->tstamp = jiffies;
2530
2531         /* Shot the device (if unregistered) */
2532
2533         if (how == 1) {
2534                 addrconf_sysctl_unregister(idev);
2535                 neigh_parms_release(&nd_tbl, idev->nd_parms);
2536                 neigh_ifdown(&nd_tbl, dev);
2537                 in6_dev_put(idev);
2538         }
2539         return 0;
2540 }
2541
2542 static void addrconf_rs_timer(unsigned long data)
2543 {
2544         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2545
2546         if (ifp->idev->cnf.forwarding)
2547                 goto out;
2548
2549         if (ifp->idev->if_flags & IF_RA_RCVD) {
2550                 /*
2551                  *      Announcement received after solicitation
2552                  *      was sent
2553                  */
2554                 goto out;
2555         }
2556
2557         spin_lock(&ifp->lock);
2558         if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2559                 struct in6_addr all_routers;
2560
2561                 /* The wait after the last probe can be shorter */
2562                 addrconf_mod_timer(ifp, AC_RS,
2563                                    (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2564                                    ifp->idev->cnf.rtr_solicit_delay :
2565                                    ifp->idev->cnf.rtr_solicit_interval);
2566                 spin_unlock(&ifp->lock);
2567
2568                 ipv6_addr_all_routers(&all_routers);
2569
2570                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2571         } else {
2572                 spin_unlock(&ifp->lock);
2573                 /*
2574                  * Note: we do not support deprecated "all on-link"
2575                  * assumption any longer.
2576                  */
2577                 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2578                        ifp->idev->dev->name);
2579         }
2580
2581 out:
2582         in6_ifa_put(ifp);
2583 }
2584
2585 /*
2586  *      Duplicate Address Detection
2587  */
2588 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2589 {
2590         unsigned long rand_num;
2591         struct inet6_dev *idev = ifp->idev;
2592
2593         if (ifp->flags & IFA_F_OPTIMISTIC)
2594                 rand_num = 0;
2595         else
2596                 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2597
2598         ifp->probes = idev->cnf.dad_transmits;
2599         addrconf_mod_timer(ifp, AC_DAD, rand_num);
2600 }
2601
2602 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2603 {
2604         struct inet6_dev *idev = ifp->idev;
2605         struct net_device *dev = idev->dev;
2606
2607         addrconf_join_solict(dev, &ifp->addr);
2608
2609         net_srandom(ifp->addr.s6_addr32[3]);
2610
2611         read_lock_bh(&idev->lock);
2612         if (ifp->dead)
2613                 goto out;
2614         spin_lock_bh(&ifp->lock);
2615
2616         if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2617             !(ifp->flags&IFA_F_TENTATIVE) ||
2618             ifp->flags & IFA_F_NODAD) {
2619                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
2620                 spin_unlock_bh(&ifp->lock);
2621                 read_unlock_bh(&idev->lock);
2622
2623                 addrconf_dad_completed(ifp);
2624                 return;
2625         }
2626
2627         if (!(idev->if_flags & IF_READY)) {
2628                 spin_unlock_bh(&ifp->lock);
2629                 read_unlock_bh(&idev->lock);
2630                 /*
2631                  * If the defice is not ready:
2632                  * - keep it tentative if it is a permanent address.
2633                  * - otherwise, kill it.
2634                  */
2635                 in6_ifa_hold(ifp);
2636                 addrconf_dad_stop(ifp);
2637                 return;
2638         }
2639
2640         /*
2641          * Optimistic nodes can start receiving
2642          * Frames right away
2643          */
2644         if(ifp->flags & IFA_F_OPTIMISTIC)
2645                 ip6_ins_rt(ifp->rt);
2646
2647         addrconf_dad_kick(ifp);
2648         spin_unlock_bh(&ifp->lock);
2649 out:
2650         read_unlock_bh(&idev->lock);
2651 }
2652
2653 static void addrconf_dad_timer(unsigned long data)
2654 {
2655         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2656         struct inet6_dev *idev = ifp->idev;
2657         struct in6_addr unspec;
2658         struct in6_addr mcaddr;
2659
2660         read_lock_bh(&idev->lock);
2661         if (idev->dead) {
2662                 read_unlock_bh(&idev->lock);
2663                 goto out;
2664         }
2665         spin_lock_bh(&ifp->lock);
2666         if (ifp->probes == 0) {
2667                 /*
2668                  * DAD was successful
2669                  */
2670
2671                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
2672                 spin_unlock_bh(&ifp->lock);
2673                 read_unlock_bh(&idev->lock);
2674
2675                 addrconf_dad_completed(ifp);
2676
2677                 goto out;
2678         }
2679
2680         ifp->probes--;
2681         addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2682         spin_unlock_bh(&ifp->lock);
2683         read_unlock_bh(&idev->lock);
2684
2685         /* send a neighbour solicitation for our addr */
2686         memset(&unspec, 0, sizeof(unspec));
2687         addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2688         ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec);
2689 out:
2690         in6_ifa_put(ifp);
2691 }
2692
2693 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2694 {
2695         struct net_device *     dev = ifp->idev->dev;
2696
2697         /*
2698          *      Configure the address for reception. Now it is valid.
2699          */
2700
2701         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2702
2703         /* If added prefix is link local and forwarding is off,
2704            start sending router solicitations.
2705          */
2706
2707         if (ifp->idev->cnf.forwarding == 0 &&
2708             ifp->idev->cnf.rtr_solicits > 0 &&
2709             (dev->flags&IFF_LOOPBACK) == 0 &&
2710             (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2711                 struct in6_addr all_routers;
2712
2713                 ipv6_addr_all_routers(&all_routers);
2714
2715                 /*
2716                  *      If a host as already performed a random delay
2717                  *      [...] as part of DAD [...] there is no need
2718                  *      to delay again before sending the first RS
2719                  */
2720                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2721
2722                 spin_lock_bh(&ifp->lock);
2723                 ifp->probes = 1;
2724                 ifp->idev->if_flags |= IF_RS_SENT;
2725                 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2726                 spin_unlock_bh(&ifp->lock);
2727         }
2728 }
2729
2730 static void addrconf_dad_run(struct inet6_dev *idev) {
2731         struct inet6_ifaddr *ifp;
2732
2733         read_lock_bh(&idev->lock);
2734         for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2735                 spin_lock_bh(&ifp->lock);
2736                 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2737                         spin_unlock_bh(&ifp->lock);
2738                         continue;
2739                 }
2740                 spin_unlock_bh(&ifp->lock);
2741                 addrconf_dad_kick(ifp);
2742         }
2743         read_unlock_bh(&idev->lock);
2744 }
2745
2746 #ifdef CONFIG_PROC_FS
2747 struct if6_iter_state {
2748         struct seq_net_private p;
2749         int bucket;
2750 };
2751
2752 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2753 {
2754         struct inet6_ifaddr *ifa = NULL;
2755         struct if6_iter_state *state = seq->private;
2756         struct net *net = state->p.net;
2757
2758         for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2759                 ifa = inet6_addr_lst[state->bucket];
2760
2761                 while (ifa && ifa->idev->dev->nd_net != net)
2762                         ifa = ifa->lst_next;
2763                 if (ifa)
2764                         break;
2765         }
2766         return ifa;
2767 }
2768
2769 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2770 {
2771         struct if6_iter_state *state = seq->private;
2772         struct net *net = state->p.net;
2773
2774         ifa = ifa->lst_next;
2775 try_again:
2776         if (ifa) {
2777                 if (ifa->idev->dev->nd_net != net) {
2778                         ifa = ifa->lst_next;
2779                         goto try_again;
2780                 }
2781         }
2782
2783         if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2784                 ifa = inet6_addr_lst[state->bucket];
2785                 goto try_again;
2786         }
2787
2788         return ifa;
2789 }
2790
2791 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2792 {
2793         struct inet6_ifaddr *ifa = if6_get_first(seq);
2794
2795         if (ifa)
2796                 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2797                         --pos;
2798         return pos ? NULL : ifa;
2799 }
2800
2801 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2802         __acquires(addrconf_hash_lock)
2803 {
2804         read_lock_bh(&addrconf_hash_lock);
2805         return if6_get_idx(seq, *pos);
2806 }
2807
2808 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2809 {
2810         struct inet6_ifaddr *ifa;
2811
2812         ifa = if6_get_next(seq, v);
2813         ++*pos;
2814         return ifa;
2815 }
2816
2817 static void if6_seq_stop(struct seq_file *seq, void *v)
2818         __releases(addrconf_hash_lock)
2819 {
2820         read_unlock_bh(&addrconf_hash_lock);
2821 }
2822
2823 static int if6_seq_show(struct seq_file *seq, void *v)
2824 {
2825         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2826         seq_printf(seq,
2827                    NIP6_SEQFMT " %02x %02x %02x %02x %8s\n",
2828                    NIP6(ifp->addr),
2829                    ifp->idev->dev->ifindex,
2830                    ifp->prefix_len,
2831                    ifp->scope,
2832                    ifp->flags,
2833                    ifp->idev->dev->name);
2834         return 0;
2835 }
2836
2837 static const struct seq_operations if6_seq_ops = {
2838         .start  = if6_seq_start,
2839         .next   = if6_seq_next,
2840         .show   = if6_seq_show,
2841         .stop   = if6_seq_stop,
2842 };
2843
2844 static int if6_seq_open(struct inode *inode, struct file *file)
2845 {
2846         return seq_open_net(inode, file, &if6_seq_ops,
2847                             sizeof(struct if6_iter_state));
2848 }
2849
2850 static const struct file_operations if6_fops = {
2851         .owner          = THIS_MODULE,
2852         .open           = if6_seq_open,
2853         .read           = seq_read,
2854         .llseek         = seq_lseek,
2855         .release        = seq_release_net,
2856 };
2857
2858 static int if6_proc_net_init(struct net *net)
2859 {
2860         if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
2861                 return -ENOMEM;
2862         return 0;
2863 }
2864
2865 static void if6_proc_net_exit(struct net *net)
2866 {
2867        proc_net_remove(net, "if_inet6");
2868 }
2869
2870 static struct pernet_operations if6_proc_net_ops = {
2871        .init = if6_proc_net_init,
2872        .exit = if6_proc_net_exit,
2873 };
2874
2875 int __init if6_proc_init(void)
2876 {
2877         return register_pernet_subsys(&if6_proc_net_ops);
2878 }
2879
2880 void if6_proc_exit(void)
2881 {
2882         unregister_pernet_subsys(&if6_proc_net_ops);
2883 }
2884 #endif  /* CONFIG_PROC_FS */
2885
2886 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
2887 /* Check if address is a home address configured on any interface. */
2888 int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr)
2889 {
2890         int ret = 0;
2891         struct inet6_ifaddr * ifp;
2892         u8 hash = ipv6_addr_hash(addr);
2893         read_lock_bh(&addrconf_hash_lock);
2894         for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) {
2895                 if (ifp->idev->dev->nd_net != net)
2896                         continue;
2897                 if (ipv6_addr_cmp(&ifp->addr, addr) == 0 &&
2898                     (ifp->flags & IFA_F_HOMEADDRESS)) {
2899                         ret = 1;
2900                         break;
2901                 }
2902         }
2903         read_unlock_bh(&addrconf_hash_lock);
2904         return ret;
2905 }
2906 #endif
2907
2908 /*
2909  *      Periodic address status verification
2910  */
2911
2912 static void addrconf_verify(unsigned long foo)
2913 {
2914         struct inet6_ifaddr *ifp;
2915         unsigned long now, next;
2916         int i;
2917
2918         spin_lock_bh(&addrconf_verify_lock);
2919         now = jiffies;
2920         next = now + ADDR_CHECK_FREQUENCY;
2921
2922         del_timer(&addr_chk_timer);
2923
2924         for (i=0; i < IN6_ADDR_HSIZE; i++) {
2925
2926 restart:
2927                 read_lock(&addrconf_hash_lock);
2928                 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
2929                         unsigned long age;
2930 #ifdef CONFIG_IPV6_PRIVACY
2931                         unsigned long regen_advance;
2932 #endif
2933
2934                         if (ifp->flags & IFA_F_PERMANENT)
2935                                 continue;
2936
2937                         spin_lock(&ifp->lock);
2938                         age = (now - ifp->tstamp) / HZ;
2939
2940 #ifdef CONFIG_IPV6_PRIVACY
2941                         regen_advance = ifp->idev->cnf.regen_max_retry *
2942                                         ifp->idev->cnf.dad_transmits *
2943                                         ifp->idev->nd_parms->retrans_time / HZ;
2944 #endif
2945
2946                         if (ifp->valid_lft != INFINITY_LIFE_TIME &&
2947                             age >= ifp->valid_lft) {
2948                                 spin_unlock(&ifp->lock);
2949                                 in6_ifa_hold(ifp);
2950                                 read_unlock(&addrconf_hash_lock);
2951                                 ipv6_del_addr(ifp);
2952                                 goto restart;
2953                         } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
2954                                 spin_unlock(&ifp->lock);
2955                                 continue;
2956                         } else if (age >= ifp->prefered_lft) {
2957                                 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
2958                                 int deprecate = 0;
2959
2960                                 if (!(ifp->flags&IFA_F_DEPRECATED)) {
2961                                         deprecate = 1;
2962                                         ifp->flags |= IFA_F_DEPRECATED;
2963                                 }
2964
2965                                 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
2966                                         next = ifp->tstamp + ifp->valid_lft * HZ;
2967
2968                                 spin_unlock(&ifp->lock);
2969
2970                                 if (deprecate) {
2971                                         in6_ifa_hold(ifp);
2972                                         read_unlock(&addrconf_hash_lock);
2973
2974                                         ipv6_ifa_notify(0, ifp);
2975                                         in6_ifa_put(ifp);
2976                                         goto restart;
2977                                 }
2978 #ifdef CONFIG_IPV6_PRIVACY
2979                         } else if ((ifp->flags&IFA_F_TEMPORARY) &&
2980                                    !(ifp->flags&IFA_F_TENTATIVE)) {
2981                                 if (age >= ifp->prefered_lft - regen_advance) {
2982                                         struct inet6_ifaddr *ifpub = ifp->ifpub;
2983                                         if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2984                                                 next = ifp->tstamp + ifp->prefered_lft * HZ;
2985                                         if (!ifp->regen_count && ifpub) {
2986                                                 ifp->regen_count++;
2987                                                 in6_ifa_hold(ifp);
2988                                                 in6_ifa_hold(ifpub);
2989                                                 spin_unlock(&ifp->lock);
2990                                                 read_unlock(&addrconf_hash_lock);
2991                                                 spin_lock(&ifpub->lock);
2992                                                 ifpub->regen_count = 0;
2993                                                 spin_unlock(&ifpub->lock);
2994                                                 ipv6_create_tempaddr(ifpub, ifp);
2995                                                 in6_ifa_put(ifpub);
2996                                                 in6_ifa_put(ifp);
2997                                                 goto restart;
2998                                         }
2999                                 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3000                                         next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3001                                 spin_unlock(&ifp->lock);
3002 #endif
3003                         } else {
3004                                 /* ifp->prefered_lft <= ifp->valid_lft */
3005                                 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3006                                         next = ifp->tstamp + ifp->prefered_lft * HZ;
3007                                 spin_unlock(&ifp->lock);
3008                         }
3009                 }
3010                 read_unlock(&addrconf_hash_lock);
3011         }
3012
3013         addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
3014         add_timer(&addr_chk_timer);
3015         spin_unlock_bh(&addrconf_verify_lock);
3016 }
3017
3018 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3019 {
3020         struct in6_addr *pfx = NULL;
3021
3022         if (addr)
3023                 pfx = nla_data(addr);
3024
3025         if (local) {
3026                 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3027                         pfx = NULL;
3028                 else
3029                         pfx = nla_data(local);
3030         }
3031
3032         return pfx;
3033 }
3034
3035 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3036         [IFA_ADDRESS]           = { .len = sizeof(struct in6_addr) },
3037         [IFA_LOCAL]             = { .len = sizeof(struct in6_addr) },
3038         [IFA_CACHEINFO]         = { .len = sizeof(struct ifa_cacheinfo) },
3039 };
3040
3041 static int
3042 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3043 {
3044         struct net *net = skb->sk->sk_net;
3045         struct ifaddrmsg *ifm;
3046         struct nlattr *tb[IFA_MAX+1];
3047         struct in6_addr *pfx;
3048         int err;
3049
3050         if (net != &init_net)
3051                 return -EINVAL;
3052
3053         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3054         if (err < 0)
3055                 return err;
3056
3057         ifm = nlmsg_data(nlh);
3058         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3059         if (pfx == NULL)
3060                 return -EINVAL;
3061
3062         return inet6_addr_del(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3063 }
3064
3065 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3066                              u32 prefered_lft, u32 valid_lft)
3067 {
3068         u32 flags = RTF_EXPIRES;
3069
3070         if (!valid_lft || (prefered_lft > valid_lft))
3071                 return -EINVAL;
3072
3073         if (valid_lft == INFINITY_LIFE_TIME) {
3074                 ifa_flags |= IFA_F_PERMANENT;
3075                 flags = 0;
3076         } else if (valid_lft >= 0x7FFFFFFF/HZ)
3077                 valid_lft = 0x7FFFFFFF/HZ;
3078
3079         if (prefered_lft == 0)
3080                 ifa_flags |= IFA_F_DEPRECATED;
3081         else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
3082                  (prefered_lft != INFINITY_LIFE_TIME))
3083                 prefered_lft = 0x7FFFFFFF/HZ;
3084
3085         spin_lock_bh(&ifp->lock);
3086         ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3087         ifp->tstamp = jiffies;
3088         ifp->valid_lft = valid_lft;
3089         ifp->prefered_lft = prefered_lft;
3090
3091         spin_unlock_bh(&ifp->lock);
3092         if (!(ifp->flags&IFA_F_TENTATIVE))
3093                 ipv6_ifa_notify(0, ifp);
3094
3095         addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3096                               jiffies_to_clock_t(valid_lft * HZ), flags);
3097         addrconf_verify(0);
3098
3099         return 0;
3100 }
3101
3102 static int
3103 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3104 {
3105         struct net *net = skb->sk->sk_net;
3106         struct ifaddrmsg *ifm;
3107         struct nlattr *tb[IFA_MAX+1];
3108         struct in6_addr *pfx;
3109         struct inet6_ifaddr *ifa;
3110         struct net_device *dev;
3111         u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3112         u8 ifa_flags;
3113         int err;
3114
3115         if (net != &init_net)
3116                 return -EINVAL;
3117
3118         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3119         if (err < 0)
3120                 return err;
3121
3122         ifm = nlmsg_data(nlh);
3123         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3124         if (pfx == NULL)
3125                 return -EINVAL;
3126
3127         if (tb[IFA_CACHEINFO]) {
3128                 struct ifa_cacheinfo *ci;
3129
3130                 ci = nla_data(tb[IFA_CACHEINFO]);
3131                 valid_lft = ci->ifa_valid;
3132                 preferred_lft = ci->ifa_prefered;
3133         } else {
3134                 preferred_lft = INFINITY_LIFE_TIME;
3135                 valid_lft = INFINITY_LIFE_TIME;
3136         }
3137
3138         dev =  __dev_get_by_index(&init_net, ifm->ifa_index);
3139         if (dev == NULL)
3140                 return -ENODEV;
3141
3142         /* We ignore other flags so far. */
3143         ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3144
3145         ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3146         if (ifa == NULL) {
3147                 /*
3148                  * It would be best to check for !NLM_F_CREATE here but
3149                  * userspace alreay relies on not having to provide this.
3150                  */
3151                 return inet6_addr_add(ifm->ifa_index, pfx, ifm->ifa_prefixlen,
3152                                       ifa_flags, preferred_lft, valid_lft);
3153         }
3154
3155         if (nlh->nlmsg_flags & NLM_F_EXCL ||
3156             !(nlh->nlmsg_flags & NLM_F_REPLACE))
3157                 err = -EEXIST;
3158         else
3159                 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3160
3161         in6_ifa_put(ifa);
3162
3163         return err;
3164 }
3165
3166 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3167                           u8 scope, int ifindex)
3168 {
3169         struct ifaddrmsg *ifm;
3170
3171         ifm = nlmsg_data(nlh);
3172         ifm->ifa_family = AF_INET6;
3173         ifm->ifa_prefixlen = prefixlen;
3174         ifm->ifa_flags = flags;
3175         ifm->ifa_scope = scope;
3176         ifm->ifa_index = ifindex;
3177 }
3178
3179 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3180                          unsigned long tstamp, u32 preferred, u32 valid)
3181 {
3182         struct ifa_cacheinfo ci;
3183
3184         ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3185                         + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3186         ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3187                         + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3188         ci.ifa_prefered = preferred;
3189         ci.ifa_valid = valid;
3190
3191         return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3192 }
3193
3194 static inline int rt_scope(int ifa_scope)
3195 {
3196         if (ifa_scope & IFA_HOST)
3197                 return RT_SCOPE_HOST;
3198         else if (ifa_scope & IFA_LINK)
3199                 return RT_SCOPE_LINK;
3200         else if (ifa_scope & IFA_SITE)
3201                 return RT_SCOPE_SITE;
3202         else
3203                 return RT_SCOPE_UNIVERSE;
3204 }
3205
3206 static inline int inet6_ifaddr_msgsize(void)
3207 {
3208         return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3209                + nla_total_size(16) /* IFA_ADDRESS */
3210                + nla_total_size(sizeof(struct ifa_cacheinfo));
3211 }
3212
3213 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3214                              u32 pid, u32 seq, int event, unsigned int flags)
3215 {
3216         struct nlmsghdr  *nlh;
3217         u32 preferred, valid;
3218
3219         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3220         if (nlh == NULL)
3221                 return -EMSGSIZE;
3222
3223         put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3224                       ifa->idev->dev->ifindex);
3225
3226         if (!(ifa->flags&IFA_F_PERMANENT)) {
3227                 preferred = ifa->prefered_lft;
3228                 valid = ifa->valid_lft;
3229                 if (preferred != INFINITY_LIFE_TIME) {
3230                         long tval = (jiffies - ifa->tstamp)/HZ;
3231                         preferred -= tval;
3232                         if (valid != INFINITY_LIFE_TIME)
3233                                 valid -= tval;
3234                 }
3235         } else {
3236                 preferred = INFINITY_LIFE_TIME;
3237                 valid = INFINITY_LIFE_TIME;
3238         }
3239
3240         if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3241             put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3242                 nlmsg_cancel(skb, nlh);
3243                 return -EMSGSIZE;
3244         }
3245
3246         return nlmsg_end(skb, nlh);
3247 }
3248
3249 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3250                                 u32 pid, u32 seq, int event, u16 flags)
3251 {
3252         struct nlmsghdr  *nlh;
3253         u8 scope = RT_SCOPE_UNIVERSE;
3254         int ifindex = ifmca->idev->dev->ifindex;
3255
3256         if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3257                 scope = RT_SCOPE_SITE;
3258
3259         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3260         if (nlh == NULL)
3261                 return -EMSGSIZE;
3262
3263         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3264         if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3265             put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3266                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3267                 nlmsg_cancel(skb, nlh);
3268                 return -EMSGSIZE;
3269         }
3270
3271         return nlmsg_end(skb, nlh);
3272 }
3273
3274 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3275                                 u32 pid, u32 seq, int event, unsigned int flags)
3276 {
3277         struct nlmsghdr  *nlh;
3278         u8 scope = RT_SCOPE_UNIVERSE;
3279         int ifindex = ifaca->aca_idev->dev->ifindex;
3280
3281         if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3282                 scope = RT_SCOPE_SITE;
3283
3284         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3285         if (nlh == NULL)
3286                 return -EMSGSIZE;
3287
3288         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3289         if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3290             put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3291                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3292                 nlmsg_cancel(skb, nlh);
3293                 return -EMSGSIZE;
3294         }
3295
3296         return nlmsg_end(skb, nlh);
3297 }
3298
3299 enum addr_type_t
3300 {
3301         UNICAST_ADDR,
3302         MULTICAST_ADDR,
3303         ANYCAST_ADDR,
3304 };
3305
3306 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3307                            enum addr_type_t type)
3308 {
3309         int idx, ip_idx;
3310         int s_idx, s_ip_idx;
3311         int err = 1;
3312         struct net_device *dev;
3313         struct inet6_dev *idev = NULL;
3314         struct inet6_ifaddr *ifa;
3315         struct ifmcaddr6 *ifmca;
3316         struct ifacaddr6 *ifaca;
3317
3318         s_idx = cb->args[0];
3319         s_ip_idx = ip_idx = cb->args[1];
3320
3321         idx = 0;
3322         for_each_netdev(&init_net, dev) {
3323                 if (idx < s_idx)
3324                         goto cont;
3325                 if (idx > s_idx)
3326                         s_ip_idx = 0;
3327                 ip_idx = 0;
3328                 if ((idev = in6_dev_get(dev)) == NULL)
3329                         goto cont;
3330                 read_lock_bh(&idev->lock);
3331                 switch (type) {
3332                 case UNICAST_ADDR:
3333                         /* unicast address incl. temp addr */
3334                         for (ifa = idev->addr_list; ifa;
3335                              ifa = ifa->if_next, ip_idx++) {
3336                                 if (ip_idx < s_ip_idx)
3337                                         continue;
3338                                 if ((err = inet6_fill_ifaddr(skb, ifa,
3339                                     NETLINK_CB(cb->skb).pid,
3340                                     cb->nlh->nlmsg_seq, RTM_NEWADDR,
3341                                     NLM_F_MULTI)) <= 0)
3342                                         goto done;
3343                         }
3344                         break;
3345                 case MULTICAST_ADDR:
3346                         /* multicast address */
3347                         for (ifmca = idev->mc_list; ifmca;
3348                              ifmca = ifmca->next, ip_idx++) {
3349                                 if (ip_idx < s_ip_idx)
3350                                         continue;
3351                                 if ((err = inet6_fill_ifmcaddr(skb, ifmca,
3352                                     NETLINK_CB(cb->skb).pid,
3353                                     cb->nlh->nlmsg_seq, RTM_GETMULTICAST,
3354                                     NLM_F_MULTI)) <= 0)
3355                                         goto done;
3356                         }
3357                         break;
3358                 case ANYCAST_ADDR:
3359                         /* anycast address */
3360                         for (ifaca = idev->ac_list; ifaca;
3361                              ifaca = ifaca->aca_next, ip_idx++) {
3362                                 if (ip_idx < s_ip_idx)
3363                                         continue;
3364                                 if ((err = inet6_fill_ifacaddr(skb, ifaca,
3365                                     NETLINK_CB(cb->skb).pid,
3366                                     cb->nlh->nlmsg_seq, RTM_GETANYCAST,
3367                                     NLM_F_MULTI)) <= 0)
3368                                         goto done;
3369                         }
3370                         break;
3371                 default:
3372                         break;
3373                 }
3374                 read_unlock_bh(&idev->lock);
3375                 in6_dev_put(idev);
3376 cont:
3377                 idx++;
3378         }
3379 done:
3380         if (err <= 0) {
3381                 read_unlock_bh(&idev->lock);
3382                 in6_dev_put(idev);
3383         }
3384         cb->args[0] = idx;
3385         cb->args[1] = ip_idx;
3386         return skb->len;
3387 }
3388
3389 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3390 {
3391         struct net *net = skb->sk->sk_net;
3392         enum addr_type_t type = UNICAST_ADDR;
3393
3394         if (net != &init_net)
3395                 return 0;
3396
3397         return inet6_dump_addr(skb, cb, type);
3398 }
3399
3400 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3401 {
3402         struct net *net = skb->sk->sk_net;
3403         enum addr_type_t type = MULTICAST_ADDR;
3404
3405         if (net != &init_net)
3406                 return 0;
3407
3408         return inet6_dump_addr(skb, cb, type);
3409 }
3410
3411
3412 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3413 {
3414         struct net *net = skb->sk->sk_net;
3415         enum addr_type_t type = ANYCAST_ADDR;
3416
3417         if (net != &init_net)
3418                 return 0;
3419
3420         return inet6_dump_addr(skb, cb, type);
3421 }
3422
3423 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3424                              void *arg)
3425 {
3426         struct net *net = in_skb->sk->sk_net;
3427         struct ifaddrmsg *ifm;
3428         struct nlattr *tb[IFA_MAX+1];
3429         struct in6_addr *addr = NULL;
3430         struct net_device *dev = NULL;
3431         struct inet6_ifaddr *ifa;
3432         struct sk_buff *skb;
3433         int err;
3434
3435         if (net != &init_net)
3436                 return -EINVAL;
3437
3438         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3439         if (err < 0)
3440                 goto errout;
3441
3442         addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3443         if (addr == NULL) {
3444                 err = -EINVAL;
3445                 goto errout;
3446         }
3447
3448         ifm = nlmsg_data(nlh);
3449         if (ifm->ifa_index)
3450                 dev = __dev_get_by_index(&init_net, ifm->ifa_index);
3451
3452         if ((ifa = ipv6_get_ifaddr(net, addr, dev, 1)) == NULL) {
3453                 err = -EADDRNOTAVAIL;
3454                 goto errout;
3455         }
3456
3457         if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) {
3458                 err = -ENOBUFS;
3459                 goto errout_ifa;
3460         }
3461
3462         err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3463                                 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3464         if (err < 0) {
3465                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3466                 WARN_ON(err == -EMSGSIZE);
3467                 kfree_skb(skb);
3468                 goto errout_ifa;
3469         }
3470         err = rtnl_unicast(skb, &init_net, NETLINK_CB(in_skb).pid);
3471 errout_ifa:
3472         in6_ifa_put(ifa);
3473 errout:
3474         return err;
3475 }
3476
3477 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3478 {
3479         struct sk_buff *skb;
3480         int err = -ENOBUFS;
3481
3482         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3483         if (skb == NULL)
3484                 goto errout;
3485
3486         err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3487         if (err < 0) {
3488                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3489                 WARN_ON(err == -EMSGSIZE);
3490                 kfree_skb(skb);
3491                 goto errout;
3492         }
3493         err = rtnl_notify(skb, &init_net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3494 errout:
3495         if (err < 0)
3496                 rtnl_set_sk_err(&init_net, RTNLGRP_IPV6_IFADDR, err);
3497 }
3498
3499 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3500                                 __s32 *array, int bytes)
3501 {
3502         BUG_ON(bytes < (DEVCONF_MAX * 4));
3503
3504         memset(array, 0, bytes);
3505         array[DEVCONF_FORWARDING] = cnf->forwarding;
3506         array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3507         array[DEVCONF_MTU6] = cnf->mtu6;
3508         array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3509         array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3510         array[DEVCONF_AUTOCONF] = cnf->autoconf;
3511         array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3512         array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3513         array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3514         array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3515         array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3516 #ifdef CONFIG_IPV6_PRIVACY
3517         array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3518         array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3519         array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3520         array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3521         array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3522 #endif
3523         array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3524         array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3525         array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3526 #ifdef CONFIG_IPV6_ROUTER_PREF
3527         array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3528         array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
3529 #ifdef CONFIG_IPV6_ROUTE_INFO
3530         array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3531 #endif
3532 #endif
3533         array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3534         array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3535 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3536         array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3537 #endif
3538 }
3539
3540 static inline size_t inet6_if_nlmsg_size(void)
3541 {
3542         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3543                + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3544                + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3545                + nla_total_size(4) /* IFLA_MTU */
3546                + nla_total_size(4) /* IFLA_LINK */
3547                + nla_total_size( /* IFLA_PROTINFO */
3548                         nla_total_size(4) /* IFLA_INET6_FLAGS */
3549                         + nla_total_size(sizeof(struct ifla_cacheinfo))
3550                         + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3551                         + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3552                         + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
3553                  );
3554 }
3555
3556 static inline void __snmp6_fill_stats(u64 *stats, void **mib, int items,
3557                                       int bytes)
3558 {
3559         int i;
3560         int pad = bytes - sizeof(u64) * items;
3561         BUG_ON(pad < 0);
3562
3563         /* Use put_unaligned() because stats may not be aligned for u64. */
3564         put_unaligned(items, &stats[0]);
3565         for (i = 1; i < items; i++)
3566                 put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3567
3568         memset(&stats[items], 0, pad);
3569 }
3570
3571 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3572                              int bytes)
3573 {
3574         switch(attrtype) {
3575         case IFLA_INET6_STATS:
3576                 __snmp6_fill_stats(stats, (void **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes);
3577                 break;
3578         case IFLA_INET6_ICMP6STATS:
3579                 __snmp6_fill_stats(stats, (void **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
3580                 break;
3581         }
3582 }
3583
3584 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3585                              u32 pid, u32 seq, int event, unsigned int flags)
3586 {
3587         struct net_device *dev = idev->dev;
3588         struct nlattr *nla;
3589         struct ifinfomsg *hdr;
3590         struct nlmsghdr *nlh;
3591         void *protoinfo;
3592         struct ifla_cacheinfo ci;
3593
3594         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3595         if (nlh == NULL)
3596                 return -EMSGSIZE;
3597
3598         hdr = nlmsg_data(nlh);
3599         hdr->ifi_family = AF_INET6;
3600         hdr->__ifi_pad = 0;
3601         hdr->ifi_type = dev->type;
3602         hdr->ifi_index = dev->ifindex;
3603         hdr->ifi_flags = dev_get_flags(dev);
3604         hdr->ifi_change = 0;
3605
3606         NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
3607
3608         if (dev->addr_len)
3609                 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3610
3611         NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
3612         if (dev->ifindex != dev->iflink)
3613                 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
3614
3615         protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3616         if (protoinfo == NULL)
3617                 goto nla_put_failure;
3618
3619         NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
3620
3621         ci.max_reasm_len = IPV6_MAXPLEN;
3622         ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3623                     + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3624         ci.reachable_time = idev->nd_parms->reachable_time;
3625         ci.retrans_time = idev->nd_parms->retrans_time;
3626         NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3627
3628         nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3629         if (nla == NULL)
3630                 goto nla_put_failure;
3631         ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
3632
3633         /* XXX - MC not implemented */
3634
3635         nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3636         if (nla == NULL)
3637                 goto nla_put_failure;
3638         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3639
3640         nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3641         if (nla == NULL)
3642                 goto nla_put_failure;
3643         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
3644
3645         nla_nest_end(skb, protoinfo);
3646         return nlmsg_end(skb, nlh);
3647
3648 nla_put_failure:
3649         nlmsg_cancel(skb, nlh);
3650         return -EMSGSIZE;
3651 }
3652
3653 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3654 {
3655         struct net *net = skb->sk->sk_net;
3656         int idx, err;
3657         int s_idx = cb->args[0];
3658         struct net_device *dev;
3659         struct inet6_dev *idev;
3660
3661         if (net != &init_net)
3662                 return 0;
3663
3664         read_lock(&dev_base_lock);
3665         idx = 0;
3666         for_each_netdev(&init_net, dev) {
3667                 if (idx < s_idx)
3668                         goto cont;
3669                 if ((idev = in6_dev_get(dev)) == NULL)
3670                         goto cont;
3671                 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
3672                                 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
3673                 in6_dev_put(idev);
3674                 if (err <= 0)
3675                         break;
3676 cont:
3677                 idx++;
3678         }
3679         read_unlock(&dev_base_lock);
3680         cb->args[0] = idx;
3681
3682         return skb->len;
3683 }
3684
3685 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3686 {
3687         struct sk_buff *skb;
3688         int err = -ENOBUFS;
3689
3690         skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
3691         if (skb == NULL)
3692                 goto errout;
3693
3694         err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
3695         if (err < 0) {
3696                 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3697                 WARN_ON(err == -EMSGSIZE);
3698                 kfree_skb(skb);
3699                 goto errout;
3700         }
3701         err = rtnl_notify(skb, &init_net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3702 errout:
3703         if (err < 0)
3704                 rtnl_set_sk_err(&init_net, RTNLGRP_IPV6_IFADDR, err);
3705 }
3706
3707 static inline size_t inet6_prefix_nlmsg_size(void)
3708 {
3709         return NLMSG_ALIGN(sizeof(struct prefixmsg))
3710                + nla_total_size(sizeof(struct in6_addr))
3711                + nla_total_size(sizeof(struct prefix_cacheinfo));
3712 }
3713
3714 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
3715                              struct prefix_info *pinfo, u32 pid, u32 seq,
3716                              int event, unsigned int flags)
3717 {
3718         struct prefixmsg *pmsg;
3719         struct nlmsghdr *nlh;
3720         struct prefix_cacheinfo ci;
3721
3722         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
3723         if (nlh == NULL)
3724                 return -EMSGSIZE;
3725
3726         pmsg = nlmsg_data(nlh);
3727         pmsg->prefix_family = AF_INET6;
3728         pmsg->prefix_pad1 = 0;
3729         pmsg->prefix_pad2 = 0;
3730         pmsg->prefix_ifindex = idev->dev->ifindex;
3731         pmsg->prefix_len = pinfo->prefix_len;
3732         pmsg->prefix_type = pinfo->type;
3733         pmsg->prefix_pad3 = 0;
3734         pmsg->prefix_flags = 0;
3735         if (pinfo->onlink)
3736                 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3737         if (pinfo->autoconf)
3738                 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3739
3740         NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
3741
3742         ci.preferred_time = ntohl(pinfo->prefered);
3743         ci.valid_time = ntohl(pinfo->valid);
3744         NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
3745
3746         return nlmsg_end(skb, nlh);
3747
3748 nla_put_failure:
3749         nlmsg_cancel(skb, nlh);
3750         return -EMSGSIZE;
3751 }
3752
3753 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
3754                          struct prefix_info *pinfo)
3755 {
3756         struct sk_buff *skb;
3757         int err = -ENOBUFS;
3758
3759         skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
3760         if (skb == NULL)
3761                 goto errout;
3762
3763         err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
3764         if (err < 0) {
3765                 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
3766                 WARN_ON(err == -EMSGSIZE);
3767                 kfree_skb(skb);
3768                 goto errout;
3769         }
3770         err = rtnl_notify(skb, &init_net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
3771 errout:
3772         if (err < 0)
3773                 rtnl_set_sk_err(&init_net, RTNLGRP_IPV6_PREFIX, err);
3774 }
3775
3776 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3777 {
3778         inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3779
3780         switch (event) {
3781         case RTM_NEWADDR:
3782                 /*
3783                  * If the address was optimistic
3784                  * we inserted the route at the start of
3785                  * our DAD process, so we don't need
3786                  * to do it again
3787                  */
3788                 if (!(ifp->rt->rt6i_node))
3789                         ip6_ins_rt(ifp->rt);
3790                 if (ifp->idev->cnf.forwarding)
3791                         addrconf_join_anycast(ifp);
3792                 break;
3793         case RTM_DELADDR:
3794                 if (ifp->idev->cnf.forwarding)
3795                         addrconf_leave_anycast(ifp);
3796                 addrconf_leave_solict(ifp->idev, &ifp->addr);
3797                 dst_hold(&ifp->rt->u.dst);
3798                 if (ip6_del_rt(ifp->rt))
3799                         dst_free(&ifp->rt->u.dst);
3800                 break;
3801         }
3802 }
3803
3804 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3805 {
3806         rcu_read_lock_bh();
3807         if (likely(ifp->idev->dead == 0))
3808                 __ipv6_ifa_notify(event, ifp);
3809         rcu_read_unlock_bh();
3810 }
3811
3812 #ifdef CONFIG_SYSCTL
3813
3814 static
3815 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3816                            void __user *buffer, size_t *lenp, loff_t *ppos)
3817 {
3818         int *valp = ctl->data;
3819         int val = *valp;
3820         int ret;
3821
3822         ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3823
3824         if (write)
3825                 addrconf_fixup_forwarding(ctl, valp, val);
3826         return ret;
3827 }
3828
3829 static int addrconf_sysctl_forward_strategy(ctl_table *table,
3830                                             int __user *name, int nlen,
3831                                             void __user *oldval,
3832                                             size_t __user *oldlenp,
3833                                             void __user *newval, size_t newlen)
3834 {
3835         int *valp = table->data;
3836         int val = *valp;
3837         int new;
3838
3839         if (!newval || !newlen)
3840                 return 0;
3841         if (newlen != sizeof(int))
3842                 return -EINVAL;
3843         if (get_user(new, (int __user *)newval))
3844                 return -EFAULT;
3845         if (new == *valp)
3846                 return 0;
3847         if (oldval && oldlenp) {
3848                 size_t len;
3849                 if (get_user(len, oldlenp))
3850                         return -EFAULT;
3851                 if (len) {
3852                         if (len > table->maxlen)
3853                                 len = table->maxlen;
3854                         if (copy_to_user(oldval, valp, len))
3855                                 return -EFAULT;
3856                         if (put_user(len, oldlenp))
3857                                 return -EFAULT;
3858                 }
3859         }
3860
3861         *valp = new;
3862         addrconf_fixup_forwarding(table, valp, val);
3863         return 1;
3864 }
3865
3866 static struct addrconf_sysctl_table
3867 {
3868         struct ctl_table_header *sysctl_header;
3869         ctl_table addrconf_vars[__NET_IPV6_MAX];
3870         char *dev_name;
3871 } addrconf_sysctl __read_mostly = {
3872         .sysctl_header = NULL,
3873         .addrconf_vars = {
3874                 {
3875                         .ctl_name       =       NET_IPV6_FORWARDING,
3876                         .procname       =       "forwarding",
3877                         .data           =       &ipv6_devconf.forwarding,
3878                         .maxlen         =       sizeof(int),
3879                         .mode           =       0644,
3880                         .proc_handler   =       &addrconf_sysctl_forward,
3881                         .strategy       =       &addrconf_sysctl_forward_strategy,
3882                 },
3883                 {
3884                         .ctl_name       =       NET_IPV6_HOP_LIMIT,
3885                         .procname       =       "hop_limit",
3886                         .data           =       &ipv6_devconf.hop_limit,
3887                         .maxlen         =       sizeof(int),
3888                         .mode           =       0644,
3889                         .proc_handler   =       proc_dointvec,
3890                 },
3891                 {
3892                         .ctl_name       =       NET_IPV6_MTU,
3893                         .procname       =       "mtu",
3894                         .data           =       &ipv6_devconf.mtu6,
3895                         .maxlen         =       sizeof(int),
3896                         .mode           =       0644,
3897                         .proc_handler   =       &proc_dointvec,
3898                 },
3899                 {
3900                         .ctl_name       =       NET_IPV6_ACCEPT_RA,
3901                         .procname       =       "accept_ra",
3902                         .data           =       &ipv6_devconf.accept_ra,
3903                         .maxlen         =       sizeof(int),
3904                         .mode           =       0644,
3905                         .proc_handler   =       &proc_dointvec,
3906                 },
3907                 {
3908                         .ctl_name       =       NET_IPV6_ACCEPT_REDIRECTS,
3909                         .procname       =       "accept_redirects",
3910                         .data           =       &ipv6_devconf.accept_redirects,
3911                         .maxlen         =       sizeof(int),
3912                         .mode           =       0644,
3913                         .proc_handler   =       &proc_dointvec,
3914                 },
3915                 {
3916                         .ctl_name       =       NET_IPV6_AUTOCONF,
3917                         .procname       =       "autoconf",
3918                         .data           =       &ipv6_devconf.autoconf,
3919                         .maxlen         =       sizeof(int),
3920                         .mode           =       0644,
3921                         .proc_handler   =       &proc_dointvec,
3922                 },
3923                 {
3924                         .ctl_name       =       NET_IPV6_DAD_TRANSMITS,
3925                         .procname       =       "dad_transmits",
3926                         .data           =       &ipv6_devconf.dad_transmits,
3927                         .maxlen         =       sizeof(int),
3928                         .mode           =       0644,
3929                         .proc_handler   =       &proc_dointvec,
3930                 },
3931                 {
3932                         .ctl_name       =       NET_IPV6_RTR_SOLICITS,
3933                         .procname       =       "router_solicitations",
3934                         .data           =       &ipv6_devconf.rtr_solicits,
3935                         .maxlen         =       sizeof(int),
3936                         .mode           =       0644,
3937                         .proc_handler   =       &proc_dointvec,
3938                 },
3939                 {
3940                         .ctl_name       =       NET_IPV6_RTR_SOLICIT_INTERVAL,
3941                         .procname       =       "router_solicitation_interval",
3942                         .data           =       &ipv6_devconf.rtr_solicit_interval,
3943                         .maxlen         =       sizeof(int),
3944                         .mode           =       0644,
3945                         .proc_handler   =       &proc_dointvec_jiffies,
3946                         .strategy       =       &sysctl_jiffies,
3947                 },
3948                 {
3949                         .ctl_name       =       NET_IPV6_RTR_SOLICIT_DELAY,
3950                         .procname       =       "router_solicitation_delay",
3951                         .data           =       &ipv6_devconf.rtr_solicit_delay,
3952                         .maxlen         =       sizeof(int),
3953                         .mode           =       0644,
3954                         .proc_handler   =       &proc_dointvec_jiffies,
3955                         .strategy       =       &sysctl_jiffies,
3956                 },
3957                 {
3958                         .ctl_name       =       NET_IPV6_FORCE_MLD_VERSION,
3959                         .procname       =       "force_mld_version",
3960                         .data           =       &ipv6_devconf.force_mld_version,
3961                         .maxlen         =       sizeof(int),
3962                         .mode           =       0644,
3963                         .proc_handler   =       &proc_dointvec,
3964                 },
3965 #ifdef CONFIG_IPV6_PRIVACY
3966                 {
3967                         .ctl_name       =       NET_IPV6_USE_TEMPADDR,
3968                         .procname       =       "use_tempaddr",
3969                         .data           =       &ipv6_devconf.use_tempaddr,
3970                         .maxlen         =       sizeof(int),
3971                         .mode           =       0644,
3972                         .proc_handler   =       &proc_dointvec,
3973                 },
3974                 {
3975                         .ctl_name       =       NET_IPV6_TEMP_VALID_LFT,
3976                         .procname       =       "temp_valid_lft",
3977                         .data           =       &ipv6_devconf.temp_valid_lft,
3978                         .maxlen         =       sizeof(int),
3979                         .mode           =       0644,
3980                         .proc_handler   =       &proc_dointvec,
3981                 },
3982                 {
3983                         .ctl_name       =       NET_IPV6_TEMP_PREFERED_LFT,
3984                         .procname       =       "temp_prefered_lft",
3985                         .data           =       &ipv6_devconf.temp_prefered_lft,
3986                         .maxlen         =       sizeof(int),
3987                         .mode           =       0644,
3988                         .proc_handler   =       &proc_dointvec,
3989                 },
3990                 {
3991                         .ctl_name       =       NET_IPV6_REGEN_MAX_RETRY,
3992                         .procname       =       "regen_max_retry",
3993                         .data           =       &ipv6_devconf.regen_max_retry,
3994                         .maxlen         =       sizeof(int),
3995                         .mode           =       0644,
3996                         .proc_handler   =       &proc_dointvec,
3997                 },
3998                 {
3999                         .ctl_name       =       NET_IPV6_MAX_DESYNC_FACTOR,
4000                         .procname       =       "max_desync_factor",
4001                         .data           =       &ipv6_devconf.max_desync_factor,
4002                         .maxlen         =       sizeof(int),
4003                         .mode           =       0644,
4004                         .proc_handler   =       &proc_dointvec,
4005                 },
4006 #endif
4007                 {
4008                         .ctl_name       =       NET_IPV6_MAX_ADDRESSES,
4009                         .procname       =       "max_addresses",
4010                         .data           =       &ipv6_devconf.max_addresses,
4011                         .maxlen         =       sizeof(int),
4012                         .mode           =       0644,
4013                         .proc_handler   =       &proc_dointvec,
4014                 },
4015                 {
4016                         .ctl_name       =       NET_IPV6_ACCEPT_RA_DEFRTR,
4017                         .procname       =       "accept_ra_defrtr",
4018                         .data           =       &ipv6_devconf.accept_ra_defrtr,
4019                         .maxlen         =       sizeof(int),
4020                         .mode           =       0644,
4021                         .proc_handler   =       &proc_dointvec,
4022                 },
4023                 {
4024                         .ctl_name       =       NET_IPV6_ACCEPT_RA_PINFO,
4025                         .procname       =       "accept_ra_pinfo",
4026                         .data           =       &ipv6_devconf.accept_ra_pinfo,
4027                         .maxlen         =       sizeof(int),
4028                         .mode           =       0644,
4029                         .proc_handler   =       &proc_dointvec,
4030                 },
4031 #ifdef CONFIG_IPV6_ROUTER_PREF
4032                 {
4033                         .ctl_name       =       NET_IPV6_ACCEPT_RA_RTR_PREF,
4034                         .procname       =       "accept_ra_rtr_pref",
4035                         .data           =       &ipv6_devconf.accept_ra_rtr_pref,
4036                         .maxlen         =       sizeof(int),
4037                         .mode           =       0644,
4038                         .proc_handler   =       &proc_dointvec,
4039                 },
4040                 {
4041                         .ctl_name       =       NET_IPV6_RTR_PROBE_INTERVAL,
4042                         .procname       =       "router_probe_interval",
4043                         .data           =       &ipv6_devconf.rtr_probe_interval,
4044                         .maxlen         =       sizeof(int),
4045                         .mode           =       0644,
4046                         .proc_handler   =       &proc_dointvec_jiffies,
4047                         .strategy       =       &sysctl_jiffies,
4048                 },
4049 #ifdef CONFIG_IPV6_ROUTE_INFO
4050                 {
4051                         .ctl_name       =       NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN,
4052                         .procname       =       "accept_ra_rt_info_max_plen",
4053                         .data           =       &ipv6_devconf.accept_ra_rt_info_max_plen,
4054                         .maxlen         =       sizeof(int),
4055                         .mode           =       0644,
4056                         .proc_handler   =       &proc_dointvec,
4057                 },
4058 #endif
4059 #endif
4060                 {
4061                         .ctl_name       =       NET_IPV6_PROXY_NDP,
4062                         .procname       =       "proxy_ndp",
4063                         .data           =       &ipv6_devconf.proxy_ndp,
4064                         .maxlen         =       sizeof(int),
4065                         .mode           =       0644,
4066                         .proc_handler   =       &proc_dointvec,
4067                 },
4068                 {
4069                         .ctl_name       =       NET_IPV6_ACCEPT_SOURCE_ROUTE,
4070                         .procname       =       "accept_source_route",
4071                         .data           =       &ipv6_devconf.accept_source_route,
4072                         .maxlen         =       sizeof(int),
4073                         .mode           =       0644,
4074                         .proc_handler   =       &proc_dointvec,
4075                 },
4076 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4077                 {
4078                         .ctl_name       =       CTL_UNNUMBERED,
4079                         .procname       =       "optimistic_dad",
4080                         .data           =       &ipv6_devconf.optimistic_dad,
4081                         .maxlen         =       sizeof(int),
4082                         .mode           =       0644,
4083                         .proc_handler   =       &proc_dointvec,
4084
4085                 },
4086 #endif
4087                 {
4088                         .ctl_name       =       0,      /* sentinel */
4089                 }
4090         },
4091 };
4092
4093 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4094                 int ctl_name, struct inet6_dev *idev, struct ipv6_devconf *p)
4095 {
4096         int i;
4097         struct addrconf_sysctl_table *t;
4098
4099 #define ADDRCONF_CTL_PATH_DEV   3
4100
4101         struct ctl_path addrconf_ctl_path[] = {
4102                 { .procname = "net", .ctl_name = CTL_NET, },
4103                 { .procname = "ipv6", .ctl_name = NET_IPV6, },
4104                 { .procname = "conf", .ctl_name = NET_IPV6_CONF, },
4105                 { /* to be set */ },
4106                 { },
4107         };
4108
4109
4110         t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4111         if (t == NULL)
4112                 goto out;
4113
4114         for (i=0; t->addrconf_vars[i].data; i++) {
4115                 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
4116                 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4117                 t->addrconf_vars[i].extra2 = net;
4118         }
4119
4120         /*
4121          * Make a copy of dev_name, because '.procname' is regarded as const
4122          * by sysctl and we wouldn't want anyone to change it under our feet
4123          * (see SIOCSIFNAME).
4124          */
4125         t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4126         if (!t->dev_name)
4127                 goto free;
4128
4129         addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
4130         addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].ctl_name = ctl_name;
4131
4132         t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
4133                         t->addrconf_vars);
4134         if (t->sysctl_header == NULL)
4135                 goto free_procname;
4136
4137         p->sysctl = t;
4138         return 0;
4139
4140 free_procname:
4141         kfree(t->dev_name);
4142 free:
4143         kfree(t);
4144 out:
4145         return -ENOBUFS;
4146 }
4147
4148 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4149 {
4150         struct addrconf_sysctl_table *t;
4151
4152         if (p->sysctl == NULL)
4153                 return;
4154
4155         t = p->sysctl;
4156         p->sysctl = NULL;
4157         unregister_sysctl_table(t->sysctl_header);
4158         kfree(t->dev_name);
4159         kfree(t);
4160 }
4161
4162 static void addrconf_sysctl_register(struct inet6_dev *idev)
4163 {
4164         neigh_sysctl_register(idev->dev, idev->nd_parms, NET_IPV6,
4165                               NET_IPV6_NEIGH, "ipv6",
4166                               &ndisc_ifinfo_sysctl_change,
4167                               NULL);
4168         __addrconf_sysctl_register(idev->dev->nd_net, idev->dev->name,
4169                         idev->dev->ifindex, idev, &idev->cnf);
4170 }
4171
4172 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
4173 {
4174         __addrconf_sysctl_unregister(&idev->cnf);
4175         neigh_sysctl_unregister(idev->nd_parms);
4176 }
4177
4178
4179 #endif
4180
4181 static int addrconf_init_net(struct net *net)
4182 {
4183         int err;
4184         struct ipv6_devconf *all, *dflt;
4185
4186         err = -ENOMEM;
4187         all = &ipv6_devconf;
4188         dflt = &ipv6_devconf_dflt;
4189
4190         if (net != &init_net) {
4191                 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4192                 if (all == NULL)
4193                         goto err_alloc_all;
4194
4195                 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4196                 if (dflt == NULL)
4197                         goto err_alloc_dflt;
4198         }
4199
4200         net->ipv6.devconf_all = all;
4201         net->ipv6.devconf_dflt = dflt;
4202
4203 #ifdef CONFIG_SYSCTL
4204         err = __addrconf_sysctl_register(net, "all", NET_PROTO_CONF_ALL,
4205                         NULL, all);
4206         if (err < 0)
4207                 goto err_reg_all;
4208
4209         err = __addrconf_sysctl_register(net, "default", NET_PROTO_CONF_DEFAULT,
4210                         NULL, dflt);
4211         if (err < 0)
4212                 goto err_reg_dflt;
4213 #endif
4214         return 0;
4215
4216 #ifdef CONFIG_SYSCTL
4217 err_reg_dflt:
4218         __addrconf_sysctl_unregister(all);
4219 err_reg_all:
4220         kfree(dflt);
4221 #endif
4222 err_alloc_dflt:
4223         kfree(all);
4224 err_alloc_all:
4225         return err;
4226 }
4227
4228 static void addrconf_exit_net(struct net *net)
4229 {
4230 #ifdef CONFIG_SYSCTL
4231         __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4232         __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4233 #endif
4234         if (net != &init_net) {
4235                 kfree(net->ipv6.devconf_dflt);
4236                 kfree(net->ipv6.devconf_all);
4237         }
4238 }
4239
4240 static struct pernet_operations addrconf_ops = {
4241         .init = addrconf_init_net,
4242         .exit = addrconf_exit_net,
4243 };
4244
4245 /*
4246  *      Device notifier
4247  */
4248
4249 int register_inet6addr_notifier(struct notifier_block *nb)
4250 {
4251         return atomic_notifier_chain_register(&inet6addr_chain, nb);
4252 }
4253
4254 EXPORT_SYMBOL(register_inet6addr_notifier);
4255
4256 int unregister_inet6addr_notifier(struct notifier_block *nb)
4257 {
4258         return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
4259 }
4260
4261 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4262
4263 /*
4264  *      Init / cleanup code
4265  */
4266
4267 int __init addrconf_init(void)
4268 {
4269         int err;
4270
4271         if ((err = ipv6_addr_label_init()) < 0) {
4272                 printk(KERN_CRIT "IPv6 Addrconf: cannot initialize default policy table: %d.\n",
4273                         err);
4274                 return err;
4275         }
4276
4277         register_pernet_subsys(&addrconf_ops);
4278
4279         /* The addrconf netdev notifier requires that loopback_dev
4280          * has it's ipv6 private information allocated and setup
4281          * before it can bring up and give link-local addresses
4282          * to other devices which are up.
4283          *
4284          * Unfortunately, loopback_dev is not necessarily the first
4285          * entry in the global dev_base list of net devices.  In fact,
4286          * it is likely to be the very last entry on that list.
4287          * So this causes the notifier registry below to try and
4288          * give link-local addresses to all devices besides loopback_dev
4289          * first, then loopback_dev, which cases all the non-loopback_dev
4290          * devices to fail to get a link-local address.
4291          *
4292          * So, as a temporary fix, allocate the ipv6 structure for
4293          * loopback_dev first by hand.
4294          * Longer term, all of the dependencies ipv6 has upon the loopback
4295          * device and it being up should be removed.
4296          */
4297         rtnl_lock();
4298         if (!ipv6_add_dev(init_net.loopback_dev))
4299                 err = -ENOMEM;
4300         rtnl_unlock();
4301         if (err)
4302                 goto errlo;
4303
4304         ip6_null_entry.u.dst.dev = init_net.loopback_dev;
4305         ip6_null_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev);
4306 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
4307         ip6_prohibit_entry.u.dst.dev = init_net.loopback_dev;
4308         ip6_prohibit_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev);
4309         ip6_blk_hole_entry.u.dst.dev = init_net.loopback_dev;
4310         ip6_blk_hole_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev);
4311 #endif
4312
4313         register_netdevice_notifier(&ipv6_dev_notf);
4314
4315         addrconf_verify(0);
4316
4317         err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4318         if (err < 0)
4319                 goto errout;
4320
4321         /* Only the first call to __rtnl_register can fail */
4322         __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4323         __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4324         __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4325         __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4326         __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4327
4328         ipv6_addr_label_rtnl_register();
4329
4330         return 0;
4331 errout:
4332         unregister_netdevice_notifier(&ipv6_dev_notf);
4333 errlo:
4334         unregister_pernet_subsys(&addrconf_ops);
4335
4336         return err;
4337 }
4338
4339 void addrconf_cleanup(void)
4340 {
4341         struct net_device *dev;
4342         struct inet6_ifaddr *ifa;
4343         int i;
4344
4345         unregister_netdevice_notifier(&ipv6_dev_notf);
4346
4347         unregister_pernet_subsys(&addrconf_ops);
4348
4349         rtnl_lock();
4350
4351         /*
4352          *      clean dev list.
4353          */
4354
4355         for_each_netdev(&init_net, dev) {
4356                 if (__in6_dev_get(dev) == NULL)
4357                         continue;
4358                 addrconf_ifdown(dev, 1);
4359         }
4360         addrconf_ifdown(init_net.loopback_dev, 2);
4361
4362         /*
4363          *      Check hash table.
4364          */
4365
4366         write_lock_bh(&addrconf_hash_lock);
4367         for (i=0; i < IN6_ADDR_HSIZE; i++) {
4368                 for (ifa=inet6_addr_lst[i]; ifa; ) {
4369                         struct inet6_ifaddr *bifa;
4370
4371                         bifa = ifa;
4372                         ifa = ifa->lst_next;
4373                         printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
4374                         /* Do not free it; something is wrong.
4375                            Now we can investigate it with debugger.
4376                          */
4377                 }
4378         }
4379         write_unlock_bh(&addrconf_hash_lock);
4380
4381         del_timer(&addr_chk_timer);
4382
4383         rtnl_unlock();
4384 }