ipv6: fix devconf after adding force_tllao option
[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  *      This program is free software; you can redistribute it and/or
10  *      modify it under the terms of the GNU General Public License
11  *      as published by the Free Software Foundation; either version
12  *      2 of the License, or (at your option) any later version.
13  */
14
15 /*
16  *      Changes:
17  *
18  *      Janos Farkas                    :       delete timer on ifdown
19  *      <chexum@bankinf.banki.hu>
20  *      Andi Kleen                      :       kill double kfree on module
21  *                                              unload.
22  *      Maciej W. Rozycki               :       FDDI support
23  *      sekiya@USAGI                    :       Don't send too many RS
24  *                                              packets.
25  *      yoshfuji@USAGI                  :       Fixed interval between DAD
26  *                                              packets.
27  *      YOSHIFUJI Hideaki @USAGI        :       improved accuracy of
28  *                                              address validation timer.
29  *      YOSHIFUJI Hideaki @USAGI        :       Privacy Extensions (RFC3041)
30  *                                              support.
31  *      Yuji SEKIYA @USAGI              :       Don't assign a same IPv6
32  *                                              address on a same interface.
33  *      YOSHIFUJI Hideaki @USAGI        :       ARCnet support
34  *      YOSHIFUJI Hideaki @USAGI        :       convert /proc/net/if_inet6 to
35  *                                              seq_file.
36  *      YOSHIFUJI Hideaki @USAGI        :       improved source address
37  *                                              selection; consider scope,
38  *                                              status etc.
39  */
40
41 #include <linux/errno.h>
42 #include <linux/types.h>
43 #include <linux/kernel.h>
44 #include <linux/socket.h>
45 #include <linux/sockios.h>
46 #include <linux/net.h>
47 #include <linux/in6.h>
48 #include <linux/netdevice.h>
49 #include <linux/if_addr.h>
50 #include <linux/if_arp.h>
51 #include <linux/if_arcnet.h>
52 #include <linux/if_infiniband.h>
53 #include <linux/route.h>
54 #include <linux/inetdevice.h>
55 #include <linux/init.h>
56 #ifdef CONFIG_SYSCTL
57 #include <linux/sysctl.h>
58 #endif
59 #include <linux/capability.h>
60 #include <linux/delay.h>
61 #include <linux/notifier.h>
62 #include <linux/string.h>
63
64 #include <net/net_namespace.h>
65 #include <net/sock.h>
66 #include <net/snmp.h>
67
68 #include <net/ipv6.h>
69 #include <net/protocol.h>
70 #include <net/ndisc.h>
71 #include <net/ip6_route.h>
72 #include <net/addrconf.h>
73 #include <net/tcp.h>
74 #include <net/ip.h>
75 #include <net/netlink.h>
76 #include <net/pkt_sched.h>
77 #include <linux/if_tunnel.h>
78 #include <linux/rtnetlink.h>
79
80 #ifdef CONFIG_IPV6_PRIVACY
81 #include <linux/random.h>
82 #endif
83
84 #include <asm/uaccess.h>
85 #include <asm/unaligned.h>
86
87 #include <linux/proc_fs.h>
88 #include <linux/seq_file.h>
89
90 /* Set to 3 to get tracing... */
91 #define ACONF_DEBUG 2
92
93 #if ACONF_DEBUG >= 3
94 #define ADBG(x) printk x
95 #else
96 #define ADBG(x)
97 #endif
98
99 #define INFINITY_LIFE_TIME      0xFFFFFFFF
100 #define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b)))
101
102 #ifdef CONFIG_SYSCTL
103 static void addrconf_sysctl_register(struct inet6_dev *idev);
104 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
105 #else
106 static inline void addrconf_sysctl_register(struct inet6_dev *idev)
107 {
108 }
109
110 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
111 {
112 }
113 #endif
114
115 #ifdef CONFIG_IPV6_PRIVACY
116 static int __ipv6_regen_rndid(struct inet6_dev *idev);
117 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
118 static void ipv6_regen_rndid(unsigned long data);
119
120 static int desync_factor = MAX_DESYNC_FACTOR * HZ;
121 #endif
122
123 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
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 void addrconf_bonding_change(struct net_device *dev,
141                                     unsigned long event);
142 static int addrconf_ifdown(struct net_device *dev, int how);
143
144 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
145 static void addrconf_dad_timer(unsigned long data);
146 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
147 static void addrconf_dad_run(struct inet6_dev *idev);
148 static void addrconf_rs_timer(unsigned long data);
149 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
150 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
151
152 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
153                                 struct prefix_info *pinfo);
154 static int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
155                               struct net_device *dev);
156
157 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
158
159 static struct ipv6_devconf ipv6_devconf __read_mostly = {
160         .forwarding             = 0,
161         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
162         .mtu6                   = IPV6_MIN_MTU,
163         .accept_ra              = 1,
164         .accept_redirects       = 1,
165         .autoconf               = 1,
166         .force_mld_version      = 0,
167         .dad_transmits          = 1,
168         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
169         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
170         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
171 #ifdef CONFIG_IPV6_PRIVACY
172         .use_tempaddr           = 0,
173         .temp_valid_lft         = TEMP_VALID_LIFETIME,
174         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
175         .regen_max_retry        = REGEN_MAX_RETRY,
176         .max_desync_factor      = MAX_DESYNC_FACTOR,
177 #endif
178         .max_addresses          = IPV6_MAX_ADDRESSES,
179         .accept_ra_defrtr       = 1,
180         .accept_ra_pinfo        = 1,
181 #ifdef CONFIG_IPV6_ROUTER_PREF
182         .accept_ra_rtr_pref     = 1,
183         .rtr_probe_interval     = 60 * HZ,
184 #ifdef CONFIG_IPV6_ROUTE_INFO
185         .accept_ra_rt_info_max_plen = 0,
186 #endif
187 #endif
188         .proxy_ndp              = 0,
189         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
190         .disable_ipv6           = 0,
191         .accept_dad             = 1,
192 };
193
194 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
195         .forwarding             = 0,
196         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
197         .mtu6                   = IPV6_MIN_MTU,
198         .accept_ra              = 1,
199         .accept_redirects       = 1,
200         .autoconf               = 1,
201         .dad_transmits          = 1,
202         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
203         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
204         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
205 #ifdef CONFIG_IPV6_PRIVACY
206         .use_tempaddr           = 0,
207         .temp_valid_lft         = TEMP_VALID_LIFETIME,
208         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
209         .regen_max_retry        = REGEN_MAX_RETRY,
210         .max_desync_factor      = MAX_DESYNC_FACTOR,
211 #endif
212         .max_addresses          = IPV6_MAX_ADDRESSES,
213         .accept_ra_defrtr       = 1,
214         .accept_ra_pinfo        = 1,
215 #ifdef CONFIG_IPV6_ROUTER_PREF
216         .accept_ra_rtr_pref     = 1,
217         .rtr_probe_interval     = 60 * HZ,
218 #ifdef CONFIG_IPV6_ROUTE_INFO
219         .accept_ra_rt_info_max_plen = 0,
220 #endif
221 #endif
222         .proxy_ndp              = 0,
223         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
224         .disable_ipv6           = 0,
225         .accept_dad             = 1,
226 };
227
228 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
229 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
230 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
231 const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
232 const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
233
234 /* Check if a valid qdisc is available */
235 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
236 {
237         return !qdisc_tx_is_noop(dev);
238 }
239
240 /* Check if a route is valid prefix route */
241 static inline int addrconf_is_prefix_route(const struct rt6_info *rt)
242 {
243         return ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0);
244 }
245
246 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
247 {
248         if (del_timer(&ifp->timer))
249                 __in6_ifa_put(ifp);
250 }
251
252 enum addrconf_timer_t
253 {
254         AC_NONE,
255         AC_DAD,
256         AC_RS,
257 };
258
259 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
260                                enum addrconf_timer_t what,
261                                unsigned long when)
262 {
263         if (!del_timer(&ifp->timer))
264                 in6_ifa_hold(ifp);
265
266         switch (what) {
267         case AC_DAD:
268                 ifp->timer.function = addrconf_dad_timer;
269                 break;
270         case AC_RS:
271                 ifp->timer.function = addrconf_rs_timer;
272                 break;
273         default:;
274         }
275         ifp->timer.expires = jiffies + when;
276         add_timer(&ifp->timer);
277 }
278
279 static int snmp6_alloc_dev(struct inet6_dev *idev)
280 {
281         if (snmp_mib_init((void **)idev->stats.ipv6,
282                           sizeof(struct ipstats_mib)) < 0)
283                 goto err_ip;
284         if (snmp_mib_init((void **)idev->stats.icmpv6,
285                           sizeof(struct icmpv6_mib)) < 0)
286                 goto err_icmp;
287         if (snmp_mib_init((void **)idev->stats.icmpv6msg,
288                           sizeof(struct icmpv6msg_mib)) < 0)
289                 goto err_icmpmsg;
290
291         return 0;
292
293 err_icmpmsg:
294         snmp_mib_free((void **)idev->stats.icmpv6);
295 err_icmp:
296         snmp_mib_free((void **)idev->stats.ipv6);
297 err_ip:
298         return -ENOMEM;
299 }
300
301 static void snmp6_free_dev(struct inet6_dev *idev)
302 {
303         snmp_mib_free((void **)idev->stats.icmpv6msg);
304         snmp_mib_free((void **)idev->stats.icmpv6);
305         snmp_mib_free((void **)idev->stats.ipv6);
306 }
307
308 /* Nobody refers to this device, we may destroy it. */
309
310 static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
311 {
312         struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
313         kfree(idev);
314 }
315
316 void in6_dev_finish_destroy(struct inet6_dev *idev)
317 {
318         struct net_device *dev = idev->dev;
319
320         WARN_ON(idev->addr_list != NULL);
321         WARN_ON(idev->mc_list != NULL);
322
323 #ifdef NET_REFCNT_DEBUG
324         printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
325 #endif
326         dev_put(dev);
327         if (!idev->dead) {
328                 printk("Freeing alive inet6 device %p\n", idev);
329                 return;
330         }
331         snmp6_free_dev(idev);
332         call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
333 }
334
335 EXPORT_SYMBOL(in6_dev_finish_destroy);
336
337 static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
338 {
339         struct inet6_dev *ndev;
340
341         ASSERT_RTNL();
342
343         if (dev->mtu < IPV6_MIN_MTU)
344                 return NULL;
345
346         ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
347
348         if (ndev == NULL)
349                 return NULL;
350
351         rwlock_init(&ndev->lock);
352         ndev->dev = dev;
353         memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
354         ndev->cnf.mtu6 = dev->mtu;
355         ndev->cnf.sysctl = NULL;
356         ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
357         if (ndev->nd_parms == NULL) {
358                 kfree(ndev);
359                 return NULL;
360         }
361         if (ndev->cnf.forwarding)
362                 dev_disable_lro(dev);
363         /* We refer to the device */
364         dev_hold(dev);
365
366         if (snmp6_alloc_dev(ndev) < 0) {
367                 ADBG((KERN_WARNING
368                         "%s(): cannot allocate memory for statistics; dev=%s.\n",
369                         __func__, dev->name));
370                 neigh_parms_release(&nd_tbl, ndev->nd_parms);
371                 ndev->dead = 1;
372                 in6_dev_finish_destroy(ndev);
373                 return NULL;
374         }
375
376         if (snmp6_register_dev(ndev) < 0) {
377                 ADBG((KERN_WARNING
378                         "%s(): cannot create /proc/net/dev_snmp6/%s\n",
379                         __func__, dev->name));
380                 neigh_parms_release(&nd_tbl, ndev->nd_parms);
381                 ndev->dead = 1;
382                 in6_dev_finish_destroy(ndev);
383                 return NULL;
384         }
385
386         /* One reference from device.  We must do this before
387          * we invoke __ipv6_regen_rndid().
388          */
389         in6_dev_hold(ndev);
390
391         if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
392                 ndev->cnf.accept_dad = -1;
393
394 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
395         if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
396                 printk(KERN_INFO
397                        "%s: Disabled Multicast RS\n",
398                        dev->name);
399                 ndev->cnf.rtr_solicits = 0;
400         }
401 #endif
402
403 #ifdef CONFIG_IPV6_PRIVACY
404         setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
405         if ((dev->flags&IFF_LOOPBACK) ||
406             dev->type == ARPHRD_TUNNEL ||
407             dev->type == ARPHRD_TUNNEL6 ||
408             dev->type == ARPHRD_SIT ||
409             dev->type == ARPHRD_NONE) {
410                 printk(KERN_INFO
411                        "%s: Disabled Privacy Extensions\n",
412                        dev->name);
413                 ndev->cnf.use_tempaddr = -1;
414         } else {
415                 in6_dev_hold(ndev);
416                 ipv6_regen_rndid((unsigned long) ndev);
417         }
418 #endif
419
420         if (netif_running(dev) && addrconf_qdisc_ok(dev))
421                 ndev->if_flags |= IF_READY;
422
423         ipv6_mc_init_dev(ndev);
424         ndev->tstamp = jiffies;
425         addrconf_sysctl_register(ndev);
426         /* protected by rtnl_lock */
427         rcu_assign_pointer(dev->ip6_ptr, ndev);
428
429         /* Join all-node multicast group */
430         ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
431
432         return ndev;
433 }
434
435 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
436 {
437         struct inet6_dev *idev;
438
439         ASSERT_RTNL();
440
441         if ((idev = __in6_dev_get(dev)) == NULL) {
442                 if ((idev = ipv6_add_dev(dev)) == NULL)
443                         return NULL;
444         }
445
446         if (dev->flags&IFF_UP)
447                 ipv6_mc_up(idev);
448         return idev;
449 }
450
451 #ifdef CONFIG_SYSCTL
452 static void dev_forward_change(struct inet6_dev *idev)
453 {
454         struct net_device *dev;
455         struct inet6_ifaddr *ifa;
456
457         if (!idev)
458                 return;
459         dev = idev->dev;
460         if (idev->cnf.forwarding)
461                 dev_disable_lro(dev);
462         if (dev && (dev->flags & IFF_MULTICAST)) {
463                 if (idev->cnf.forwarding)
464                         ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
465                 else
466                         ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
467         }
468         for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
469                 if (ifa->flags&IFA_F_TENTATIVE)
470                         continue;
471                 if (idev->cnf.forwarding)
472                         addrconf_join_anycast(ifa);
473                 else
474                         addrconf_leave_anycast(ifa);
475         }
476 }
477
478
479 static void addrconf_forward_change(struct net *net, __s32 newf)
480 {
481         struct net_device *dev;
482         struct inet6_dev *idev;
483
484         read_lock(&dev_base_lock);
485         for_each_netdev(net, dev) {
486                 rcu_read_lock();
487                 idev = __in6_dev_get(dev);
488                 if (idev) {
489                         int changed = (!idev->cnf.forwarding) ^ (!newf);
490                         idev->cnf.forwarding = newf;
491                         if (changed)
492                                 dev_forward_change(idev);
493                 }
494                 rcu_read_unlock();
495         }
496         read_unlock(&dev_base_lock);
497 }
498
499 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old)
500 {
501         struct net *net;
502
503         net = (struct net *)table->extra2;
504         if (p == &net->ipv6.devconf_dflt->forwarding)
505                 return 0;
506
507         if (!rtnl_trylock())
508                 return restart_syscall();
509
510         if (p == &net->ipv6.devconf_all->forwarding) {
511                 __s32 newf = net->ipv6.devconf_all->forwarding;
512                 net->ipv6.devconf_dflt->forwarding = newf;
513                 addrconf_forward_change(net, newf);
514         } else if ((!*p) ^ (!old))
515                 dev_forward_change((struct inet6_dev *)table->extra1);
516         rtnl_unlock();
517
518         if (*p)
519                 rt6_purge_dflt_routers(net);
520         return 1;
521 }
522 #endif
523
524 /* Nobody refers to this ifaddr, destroy it */
525
526 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
527 {
528         WARN_ON(ifp->if_next != NULL);
529         WARN_ON(ifp->lst_next != NULL);
530
531 #ifdef NET_REFCNT_DEBUG
532         printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
533 #endif
534
535         in6_dev_put(ifp->idev);
536
537         if (del_timer(&ifp->timer))
538                 printk("Timer is still running, when freeing ifa=%p\n", ifp);
539
540         if (!ifp->dead) {
541                 printk("Freeing alive inet6 address %p\n", ifp);
542                 return;
543         }
544         dst_release(&ifp->rt->u.dst);
545
546         kfree(ifp);
547 }
548
549 static void
550 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
551 {
552         struct inet6_ifaddr *ifa, **ifap;
553         int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
554
555         /*
556          * Each device address list is sorted in order of scope -
557          * global before linklocal.
558          */
559         for (ifap = &idev->addr_list; (ifa = *ifap) != NULL;
560              ifap = &ifa->if_next) {
561                 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
562                         break;
563         }
564
565         ifp->if_next = *ifap;
566         *ifap = ifp;
567 }
568
569 /*
570  *      Hash function taken from net_alias.c
571  */
572 static u8 ipv6_addr_hash(const struct in6_addr *addr)
573 {
574         __u32 word;
575
576         /*
577          * We perform the hash function over the last 64 bits of the address
578          * This will include the IEEE address token on links that support it.
579          */
580
581         word = (__force u32)(addr->s6_addr32[2] ^ addr->s6_addr32[3]);
582         word ^= (word >> 16);
583         word ^= (word >> 8);
584
585         return ((word ^ (word >> 4)) & 0x0f);
586 }
587
588 /* On success it returns ifp with increased reference count */
589
590 static struct inet6_ifaddr *
591 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
592               int scope, u32 flags)
593 {
594         struct inet6_ifaddr *ifa = NULL;
595         struct rt6_info *rt;
596         int hash;
597         int err = 0;
598         int addr_type = ipv6_addr_type(addr);
599
600         if (addr_type == IPV6_ADDR_ANY ||
601             addr_type & IPV6_ADDR_MULTICAST ||
602             (!(idev->dev->flags & IFF_LOOPBACK) &&
603              addr_type & IPV6_ADDR_LOOPBACK))
604                 return ERR_PTR(-EADDRNOTAVAIL);
605
606         rcu_read_lock_bh();
607         if (idev->dead) {
608                 err = -ENODEV;                  /*XXX*/
609                 goto out2;
610         }
611
612         if (idev->cnf.disable_ipv6) {
613                 err = -EACCES;
614                 goto out2;
615         }
616
617         write_lock(&addrconf_hash_lock);
618
619         /* Ignore adding duplicate addresses on an interface */
620         if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
621                 ADBG(("ipv6_add_addr: already assigned\n"));
622                 err = -EEXIST;
623                 goto out;
624         }
625
626         ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
627
628         if (ifa == NULL) {
629                 ADBG(("ipv6_add_addr: malloc failed\n"));
630                 err = -ENOBUFS;
631                 goto out;
632         }
633
634         rt = addrconf_dst_alloc(idev, addr, 0);
635         if (IS_ERR(rt)) {
636                 err = PTR_ERR(rt);
637                 goto out;
638         }
639
640         ipv6_addr_copy(&ifa->addr, addr);
641
642         spin_lock_init(&ifa->lock);
643         init_timer(&ifa->timer);
644         ifa->timer.data = (unsigned long) ifa;
645         ifa->scope = scope;
646         ifa->prefix_len = pfxlen;
647         ifa->flags = flags | IFA_F_TENTATIVE;
648         ifa->cstamp = ifa->tstamp = jiffies;
649
650         ifa->rt = rt;
651
652         /*
653          * part one of RFC 4429, section 3.3
654          * We should not configure an address as
655          * optimistic if we do not yet know the link
656          * layer address of our nexhop router
657          */
658
659         if (rt->rt6i_nexthop == NULL)
660                 ifa->flags &= ~IFA_F_OPTIMISTIC;
661
662         ifa->idev = idev;
663         in6_dev_hold(idev);
664         /* For caller */
665         in6_ifa_hold(ifa);
666
667         /* Add to big hash table */
668         hash = ipv6_addr_hash(addr);
669
670         ifa->lst_next = inet6_addr_lst[hash];
671         inet6_addr_lst[hash] = ifa;
672         in6_ifa_hold(ifa);
673         write_unlock(&addrconf_hash_lock);
674
675         write_lock(&idev->lock);
676         /* Add to inet6_dev unicast addr list. */
677         ipv6_link_dev_addr(idev, ifa);
678
679 #ifdef CONFIG_IPV6_PRIVACY
680         if (ifa->flags&IFA_F_TEMPORARY) {
681                 ifa->tmp_next = idev->tempaddr_list;
682                 idev->tempaddr_list = ifa;
683                 in6_ifa_hold(ifa);
684         }
685 #endif
686
687         in6_ifa_hold(ifa);
688         write_unlock(&idev->lock);
689 out2:
690         rcu_read_unlock_bh();
691
692         if (likely(err == 0))
693                 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
694         else {
695                 kfree(ifa);
696                 ifa = ERR_PTR(err);
697         }
698
699         return ifa;
700 out:
701         write_unlock(&addrconf_hash_lock);
702         goto out2;
703 }
704
705 /* This function wants to get referenced ifp and releases it before return */
706
707 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
708 {
709         struct inet6_ifaddr *ifa, **ifap;
710         struct inet6_dev *idev = ifp->idev;
711         int hash;
712         int deleted = 0, onlink = 0;
713         unsigned long expires = jiffies;
714
715         hash = ipv6_addr_hash(&ifp->addr);
716
717         ifp->dead = 1;
718
719         write_lock_bh(&addrconf_hash_lock);
720         for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
721              ifap = &ifa->lst_next) {
722                 if (ifa == ifp) {
723                         *ifap = ifa->lst_next;
724                         __in6_ifa_put(ifp);
725                         ifa->lst_next = NULL;
726                         break;
727                 }
728         }
729         write_unlock_bh(&addrconf_hash_lock);
730
731         write_lock_bh(&idev->lock);
732 #ifdef CONFIG_IPV6_PRIVACY
733         if (ifp->flags&IFA_F_TEMPORARY) {
734                 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
735                      ifap = &ifa->tmp_next) {
736                         if (ifa == ifp) {
737                                 *ifap = ifa->tmp_next;
738                                 if (ifp->ifpub) {
739                                         in6_ifa_put(ifp->ifpub);
740                                         ifp->ifpub = NULL;
741                                 }
742                                 __in6_ifa_put(ifp);
743                                 ifa->tmp_next = NULL;
744                                 break;
745                         }
746                 }
747         }
748 #endif
749
750         for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
751                 if (ifa == ifp) {
752                         *ifap = ifa->if_next;
753                         __in6_ifa_put(ifp);
754                         ifa->if_next = NULL;
755                         if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
756                                 break;
757                         deleted = 1;
758                         continue;
759                 } else if (ifp->flags & IFA_F_PERMANENT) {
760                         if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
761                                               ifp->prefix_len)) {
762                                 if (ifa->flags & IFA_F_PERMANENT) {
763                                         onlink = 1;
764                                         if (deleted)
765                                                 break;
766                                 } else {
767                                         unsigned long lifetime;
768
769                                         if (!onlink)
770                                                 onlink = -1;
771
772                                         spin_lock(&ifa->lock);
773
774                                         lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
775                                         /*
776                                          * Note: Because this address is
777                                          * not permanent, lifetime <
778                                          * LONG_MAX / HZ here.
779                                          */
780                                         if (time_before(expires,
781                                                         ifa->tstamp + lifetime * HZ))
782                                                 expires = ifa->tstamp + lifetime * HZ;
783                                         spin_unlock(&ifa->lock);
784                                 }
785                         }
786                 }
787                 ifap = &ifa->if_next;
788         }
789         write_unlock_bh(&idev->lock);
790
791         addrconf_del_timer(ifp);
792
793         ipv6_ifa_notify(RTM_DELADDR, ifp);
794
795         atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
796
797         /*
798          * Purge or update corresponding prefix
799          *
800          * 1) we don't purge prefix here if address was not permanent.
801          *    prefix is managed by its own lifetime.
802          * 2) if there're no addresses, delete prefix.
803          * 3) if there're still other permanent address(es),
804          *    corresponding prefix is still permanent.
805          * 4) otherwise, update prefix lifetime to the
806          *    longest valid lifetime among the corresponding
807          *    addresses on the device.
808          *    Note: subsequent RA will update lifetime.
809          *
810          * --yoshfuji
811          */
812         if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
813                 struct in6_addr prefix;
814                 struct rt6_info *rt;
815                 struct net *net = dev_net(ifp->idev->dev);
816                 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
817                 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1);
818
819                 if (rt && addrconf_is_prefix_route(rt)) {
820                         if (onlink == 0) {
821                                 ip6_del_rt(rt);
822                                 rt = NULL;
823                         } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
824                                 rt->rt6i_expires = expires;
825                                 rt->rt6i_flags |= RTF_EXPIRES;
826                         }
827                 }
828                 dst_release(&rt->u.dst);
829         }
830
831         in6_ifa_put(ifp);
832 }
833
834 #ifdef CONFIG_IPV6_PRIVACY
835 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
836 {
837         struct inet6_dev *idev = ifp->idev;
838         struct in6_addr addr, *tmpaddr;
839         unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
840         unsigned long regen_advance;
841         int tmp_plen;
842         int ret = 0;
843         int max_addresses;
844         u32 addr_flags;
845
846         write_lock(&idev->lock);
847         if (ift) {
848                 spin_lock_bh(&ift->lock);
849                 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
850                 spin_unlock_bh(&ift->lock);
851                 tmpaddr = &addr;
852         } else {
853                 tmpaddr = NULL;
854         }
855 retry:
856         in6_dev_hold(idev);
857         if (idev->cnf.use_tempaddr <= 0) {
858                 write_unlock(&idev->lock);
859                 printk(KERN_INFO
860                         "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
861                 in6_dev_put(idev);
862                 ret = -1;
863                 goto out;
864         }
865         spin_lock_bh(&ifp->lock);
866         if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
867                 idev->cnf.use_tempaddr = -1;    /*XXX*/
868                 spin_unlock_bh(&ifp->lock);
869                 write_unlock(&idev->lock);
870                 printk(KERN_WARNING
871                         "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
872                 in6_dev_put(idev);
873                 ret = -1;
874                 goto out;
875         }
876         in6_ifa_hold(ifp);
877         memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
878         if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
879                 spin_unlock_bh(&ifp->lock);
880                 write_unlock(&idev->lock);
881                 printk(KERN_WARNING
882                         "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
883                 in6_ifa_put(ifp);
884                 in6_dev_put(idev);
885                 ret = -1;
886                 goto out;
887         }
888         memcpy(&addr.s6_addr[8], idev->rndid, 8);
889         tmp_valid_lft = min_t(__u32,
890                               ifp->valid_lft,
891                               idev->cnf.temp_valid_lft);
892         tmp_prefered_lft = min_t(__u32,
893                                  ifp->prefered_lft,
894                                  idev->cnf.temp_prefered_lft - desync_factor / HZ);
895         tmp_plen = ifp->prefix_len;
896         max_addresses = idev->cnf.max_addresses;
897         tmp_cstamp = ifp->cstamp;
898         tmp_tstamp = ifp->tstamp;
899         spin_unlock_bh(&ifp->lock);
900
901         regen_advance = idev->cnf.regen_max_retry *
902                         idev->cnf.dad_transmits *
903                         idev->nd_parms->retrans_time / HZ;
904         write_unlock(&idev->lock);
905
906         /* A temporary address is created only if this calculated Preferred
907          * Lifetime is greater than REGEN_ADVANCE time units.  In particular,
908          * an implementation must not create a temporary address with a zero
909          * Preferred Lifetime.
910          */
911         if (tmp_prefered_lft <= regen_advance) {
912                 in6_ifa_put(ifp);
913                 in6_dev_put(idev);
914                 ret = -1;
915                 goto out;
916         }
917
918         addr_flags = IFA_F_TEMPORARY;
919         /* set in addrconf_prefix_rcv() */
920         if (ifp->flags & IFA_F_OPTIMISTIC)
921                 addr_flags |= IFA_F_OPTIMISTIC;
922
923         ift = !max_addresses ||
924               ipv6_count_addresses(idev) < max_addresses ?
925                 ipv6_add_addr(idev, &addr, tmp_plen,
926                               ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
927                               addr_flags) : NULL;
928         if (!ift || IS_ERR(ift)) {
929                 in6_ifa_put(ifp);
930                 in6_dev_put(idev);
931                 printk(KERN_INFO
932                         "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
933                 tmpaddr = &addr;
934                 write_lock(&idev->lock);
935                 goto retry;
936         }
937
938         spin_lock_bh(&ift->lock);
939         ift->ifpub = ifp;
940         ift->valid_lft = tmp_valid_lft;
941         ift->prefered_lft = tmp_prefered_lft;
942         ift->cstamp = tmp_cstamp;
943         ift->tstamp = tmp_tstamp;
944         spin_unlock_bh(&ift->lock);
945
946         addrconf_dad_start(ift, 0);
947         in6_ifa_put(ift);
948         in6_dev_put(idev);
949 out:
950         return ret;
951 }
952 #endif
953
954 /*
955  *      Choose an appropriate source address (RFC3484)
956  */
957 enum {
958         IPV6_SADDR_RULE_INIT = 0,
959         IPV6_SADDR_RULE_LOCAL,
960         IPV6_SADDR_RULE_SCOPE,
961         IPV6_SADDR_RULE_PREFERRED,
962 #ifdef CONFIG_IPV6_MIP6
963         IPV6_SADDR_RULE_HOA,
964 #endif
965         IPV6_SADDR_RULE_OIF,
966         IPV6_SADDR_RULE_LABEL,
967 #ifdef CONFIG_IPV6_PRIVACY
968         IPV6_SADDR_RULE_PRIVACY,
969 #endif
970         IPV6_SADDR_RULE_ORCHID,
971         IPV6_SADDR_RULE_PREFIX,
972         IPV6_SADDR_RULE_MAX
973 };
974
975 struct ipv6_saddr_score {
976         int                     rule;
977         int                     addr_type;
978         struct inet6_ifaddr     *ifa;
979         DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
980         int                     scopedist;
981         int                     matchlen;
982 };
983
984 struct ipv6_saddr_dst {
985         const struct in6_addr *addr;
986         int ifindex;
987         int scope;
988         int label;
989         unsigned int prefs;
990 };
991
992 static inline int ipv6_saddr_preferred(int type)
993 {
994         if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
995                     IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
996                 return 1;
997         return 0;
998 }
999
1000 static int ipv6_get_saddr_eval(struct net *net,
1001                                struct ipv6_saddr_score *score,
1002                                struct ipv6_saddr_dst *dst,
1003                                int i)
1004 {
1005         int ret;
1006
1007         if (i <= score->rule) {
1008                 switch (i) {
1009                 case IPV6_SADDR_RULE_SCOPE:
1010                         ret = score->scopedist;
1011                         break;
1012                 case IPV6_SADDR_RULE_PREFIX:
1013                         ret = score->matchlen;
1014                         break;
1015                 default:
1016                         ret = !!test_bit(i, score->scorebits);
1017                 }
1018                 goto out;
1019         }
1020
1021         switch (i) {
1022         case IPV6_SADDR_RULE_INIT:
1023                 /* Rule 0: remember if hiscore is not ready yet */
1024                 ret = !!score->ifa;
1025                 break;
1026         case IPV6_SADDR_RULE_LOCAL:
1027                 /* Rule 1: Prefer same address */
1028                 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1029                 break;
1030         case IPV6_SADDR_RULE_SCOPE:
1031                 /* Rule 2: Prefer appropriate scope
1032                  *
1033                  *      ret
1034                  *       ^
1035                  *    -1 |  d 15
1036                  *    ---+--+-+---> scope
1037                  *       |
1038                  *       |             d is scope of the destination.
1039                  *  B-d  |  \
1040                  *       |   \      <- smaller scope is better if
1041                  *  B-15 |    \        if scope is enough for destinaion.
1042                  *       |             ret = B - scope (-1 <= scope >= d <= 15).
1043                  * d-C-1 | /
1044                  *       |/         <- greater is better
1045                  *   -C  /             if scope is not enough for destination.
1046                  *      /|             ret = scope - C (-1 <= d < scope <= 15).
1047                  *
1048                  * d - C - 1 < B -15 (for all -1 <= d <= 15).
1049                  * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1050                  * Assume B = 0 and we get C > 29.
1051                  */
1052                 ret = __ipv6_addr_src_scope(score->addr_type);
1053                 if (ret >= dst->scope)
1054                         ret = -ret;
1055                 else
1056                         ret -= 128;     /* 30 is enough */
1057                 score->scopedist = ret;
1058                 break;
1059         case IPV6_SADDR_RULE_PREFERRED:
1060                 /* Rule 3: Avoid deprecated and optimistic addresses */
1061                 ret = ipv6_saddr_preferred(score->addr_type) ||
1062                       !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1063                 break;
1064 #ifdef CONFIG_IPV6_MIP6
1065         case IPV6_SADDR_RULE_HOA:
1066             {
1067                 /* Rule 4: Prefer home address */
1068                 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1069                 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1070                 break;
1071             }
1072 #endif
1073         case IPV6_SADDR_RULE_OIF:
1074                 /* Rule 5: Prefer outgoing interface */
1075                 ret = (!dst->ifindex ||
1076                        dst->ifindex == score->ifa->idev->dev->ifindex);
1077                 break;
1078         case IPV6_SADDR_RULE_LABEL:
1079                 /* Rule 6: Prefer matching label */
1080                 ret = ipv6_addr_label(net,
1081                                       &score->ifa->addr, score->addr_type,
1082                                       score->ifa->idev->dev->ifindex) == dst->label;
1083                 break;
1084 #ifdef CONFIG_IPV6_PRIVACY
1085         case IPV6_SADDR_RULE_PRIVACY:
1086             {
1087                 /* Rule 7: Prefer public address
1088                  * Note: prefer temprary address if use_tempaddr >= 2
1089                  */
1090                 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1091                                 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1092                                 score->ifa->idev->cnf.use_tempaddr >= 2;
1093                 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1094                 break;
1095             }
1096 #endif
1097         case IPV6_SADDR_RULE_ORCHID:
1098                 /* Rule 8-: Prefer ORCHID vs ORCHID or
1099                  *          non-ORCHID vs non-ORCHID
1100                  */
1101                 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1102                         ipv6_addr_orchid(dst->addr));
1103                 break;
1104         case IPV6_SADDR_RULE_PREFIX:
1105                 /* Rule 8: Use longest matching prefix */
1106                 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr,
1107                                                        dst->addr);
1108                 break;
1109         default:
1110                 ret = 0;
1111         }
1112
1113         if (ret)
1114                 __set_bit(i, score->scorebits);
1115         score->rule = i;
1116 out:
1117         return ret;
1118 }
1119
1120 int ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev,
1121                        const struct in6_addr *daddr, unsigned int prefs,
1122                        struct in6_addr *saddr)
1123 {
1124         struct ipv6_saddr_score scores[2],
1125                                 *score = &scores[0], *hiscore = &scores[1];
1126         struct ipv6_saddr_dst dst;
1127         struct net_device *dev;
1128         int dst_type;
1129
1130         dst_type = __ipv6_addr_type(daddr);
1131         dst.addr = daddr;
1132         dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1133         dst.scope = __ipv6_addr_src_scope(dst_type);
1134         dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1135         dst.prefs = prefs;
1136
1137         hiscore->rule = -1;
1138         hiscore->ifa = NULL;
1139
1140         read_lock(&dev_base_lock);
1141         rcu_read_lock();
1142
1143         for_each_netdev(net, dev) {
1144                 struct inet6_dev *idev;
1145
1146                 /* Candidate Source Address (section 4)
1147                  *  - multicast and link-local destination address,
1148                  *    the set of candidate source address MUST only
1149                  *    include addresses assigned to interfaces
1150                  *    belonging to the same link as the outgoing
1151                  *    interface.
1152                  * (- For site-local destination addresses, the
1153                  *    set of candidate source addresses MUST only
1154                  *    include addresses assigned to interfaces
1155                  *    belonging to the same site as the outgoing
1156                  *    interface.)
1157                  */
1158                 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1159                      dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1160                     dst.ifindex && dev->ifindex != dst.ifindex)
1161                         continue;
1162
1163                 idev = __in6_dev_get(dev);
1164                 if (!idev)
1165                         continue;
1166
1167                 read_lock_bh(&idev->lock);
1168                 for (score->ifa = idev->addr_list; score->ifa; score->ifa = score->ifa->if_next) {
1169                         int i;
1170
1171                         /*
1172                          * - Tentative Address (RFC2462 section 5.4)
1173                          *  - A tentative address is not considered
1174                          *    "assigned to an interface" in the traditional
1175                          *    sense, unless it is also flagged as optimistic.
1176                          * - Candidate Source Address (section 4)
1177                          *  - In any case, anycast addresses, multicast
1178                          *    addresses, and the unspecified address MUST
1179                          *    NOT be included in a candidate set.
1180                          */
1181                         if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1182                             (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1183                                 continue;
1184
1185                         score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1186
1187                         if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1188                                      score->addr_type & IPV6_ADDR_MULTICAST)) {
1189                                 LIMIT_NETDEBUG(KERN_DEBUG
1190                                                "ADDRCONF: unspecified / multicast address "
1191                                                "assigned as unicast address on %s",
1192                                                dev->name);
1193                                 continue;
1194                         }
1195
1196                         score->rule = -1;
1197                         bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1198
1199                         for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1200                                 int minihiscore, miniscore;
1201
1202                                 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1203                                 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1204
1205                                 if (minihiscore > miniscore) {
1206                                         if (i == IPV6_SADDR_RULE_SCOPE &&
1207                                             score->scopedist > 0) {
1208                                                 /*
1209                                                  * special case:
1210                                                  * each remaining entry
1211                                                  * has too small (not enough)
1212                                                  * scope, because ifa entries
1213                                                  * are sorted by their scope
1214                                                  * values.
1215                                                  */
1216                                                 goto try_nextdev;
1217                                         }
1218                                         break;
1219                                 } else if (minihiscore < miniscore) {
1220                                         if (hiscore->ifa)
1221                                                 in6_ifa_put(hiscore->ifa);
1222
1223                                         in6_ifa_hold(score->ifa);
1224
1225                                         swap(hiscore, score);
1226
1227                                         /* restore our iterator */
1228                                         score->ifa = hiscore->ifa;
1229
1230                                         break;
1231                                 }
1232                         }
1233                 }
1234 try_nextdev:
1235                 read_unlock_bh(&idev->lock);
1236         }
1237         rcu_read_unlock();
1238         read_unlock(&dev_base_lock);
1239
1240         if (!hiscore->ifa)
1241                 return -EADDRNOTAVAIL;
1242
1243         ipv6_addr_copy(saddr, &hiscore->ifa->addr);
1244         in6_ifa_put(hiscore->ifa);
1245         return 0;
1246 }
1247
1248 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1249
1250 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1251                     unsigned char banned_flags)
1252 {
1253         struct inet6_dev *idev;
1254         int err = -EADDRNOTAVAIL;
1255
1256         rcu_read_lock();
1257         if ((idev = __in6_dev_get(dev)) != NULL) {
1258                 struct inet6_ifaddr *ifp;
1259
1260                 read_lock_bh(&idev->lock);
1261                 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1262                         if (ifp->scope == IFA_LINK && !(ifp->flags & banned_flags)) {
1263                                 ipv6_addr_copy(addr, &ifp->addr);
1264                                 err = 0;
1265                                 break;
1266                         }
1267                 }
1268                 read_unlock_bh(&idev->lock);
1269         }
1270         rcu_read_unlock();
1271         return err;
1272 }
1273
1274 static int ipv6_count_addresses(struct inet6_dev *idev)
1275 {
1276         int cnt = 0;
1277         struct inet6_ifaddr *ifp;
1278
1279         read_lock_bh(&idev->lock);
1280         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1281                 cnt++;
1282         read_unlock_bh(&idev->lock);
1283         return cnt;
1284 }
1285
1286 int ipv6_chk_addr(struct net *net, struct in6_addr *addr,
1287                   struct net_device *dev, int strict)
1288 {
1289         struct inet6_ifaddr * ifp;
1290         u8 hash = ipv6_addr_hash(addr);
1291
1292         read_lock_bh(&addrconf_hash_lock);
1293         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1294                 if (!net_eq(dev_net(ifp->idev->dev), net))
1295                         continue;
1296                 if (ipv6_addr_equal(&ifp->addr, addr) &&
1297                     !(ifp->flags&IFA_F_TENTATIVE)) {
1298                         if (dev == NULL || ifp->idev->dev == dev ||
1299                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1300                                 break;
1301                 }
1302         }
1303         read_unlock_bh(&addrconf_hash_lock);
1304         return ifp != NULL;
1305 }
1306 EXPORT_SYMBOL(ipv6_chk_addr);
1307
1308 static
1309 int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1310                        struct net_device *dev)
1311 {
1312         struct inet6_ifaddr * ifp;
1313         u8 hash = ipv6_addr_hash(addr);
1314
1315         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1316                 if (!net_eq(dev_net(ifp->idev->dev), net))
1317                         continue;
1318                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1319                         if (dev == NULL || ifp->idev->dev == dev)
1320                                 break;
1321                 }
1322         }
1323         return ifp != NULL;
1324 }
1325
1326 int ipv6_chk_prefix(struct in6_addr *addr, struct net_device *dev)
1327 {
1328         struct inet6_dev *idev;
1329         struct inet6_ifaddr *ifa;
1330         int     onlink;
1331
1332         onlink = 0;
1333         rcu_read_lock();
1334         idev = __in6_dev_get(dev);
1335         if (idev) {
1336                 read_lock_bh(&idev->lock);
1337                 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
1338                         onlink = ipv6_prefix_equal(addr, &ifa->addr,
1339                                                    ifa->prefix_len);
1340                         if (onlink)
1341                                 break;
1342                 }
1343                 read_unlock_bh(&idev->lock);
1344         }
1345         rcu_read_unlock();
1346         return onlink;
1347 }
1348
1349 EXPORT_SYMBOL(ipv6_chk_prefix);
1350
1351 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1352                                      struct net_device *dev, int strict)
1353 {
1354         struct inet6_ifaddr * ifp;
1355         u8 hash = ipv6_addr_hash(addr);
1356
1357         read_lock_bh(&addrconf_hash_lock);
1358         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1359                 if (!net_eq(dev_net(ifp->idev->dev), net))
1360                         continue;
1361                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1362                         if (dev == NULL || ifp->idev->dev == dev ||
1363                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1364                                 in6_ifa_hold(ifp);
1365                                 break;
1366                         }
1367                 }
1368         }
1369         read_unlock_bh(&addrconf_hash_lock);
1370
1371         return ifp;
1372 }
1373
1374 /* Gets referenced address, destroys ifaddr */
1375
1376 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1377 {
1378         if (ifp->flags&IFA_F_PERMANENT) {
1379                 spin_lock_bh(&ifp->lock);
1380                 addrconf_del_timer(ifp);
1381                 ifp->flags |= IFA_F_TENTATIVE;
1382                 if (dad_failed)
1383                         ifp->flags |= IFA_F_DADFAILED;
1384                 spin_unlock_bh(&ifp->lock);
1385                 in6_ifa_put(ifp);
1386 #ifdef CONFIG_IPV6_PRIVACY
1387         } else if (ifp->flags&IFA_F_TEMPORARY) {
1388                 struct inet6_ifaddr *ifpub;
1389                 spin_lock_bh(&ifp->lock);
1390                 ifpub = ifp->ifpub;
1391                 if (ifpub) {
1392                         in6_ifa_hold(ifpub);
1393                         spin_unlock_bh(&ifp->lock);
1394                         ipv6_create_tempaddr(ifpub, ifp);
1395                         in6_ifa_put(ifpub);
1396                 } else {
1397                         spin_unlock_bh(&ifp->lock);
1398                 }
1399                 ipv6_del_addr(ifp);
1400 #endif
1401         } else
1402                 ipv6_del_addr(ifp);
1403 }
1404
1405 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1406 {
1407         struct inet6_dev *idev = ifp->idev;
1408
1409         if (net_ratelimit())
1410                 printk(KERN_INFO "%s: IPv6 duplicate address %pI6c detected!\n",
1411                         ifp->idev->dev->name, &ifp->addr);
1412
1413         if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1414                 struct in6_addr addr;
1415
1416                 addr.s6_addr32[0] = htonl(0xfe800000);
1417                 addr.s6_addr32[1] = 0;
1418
1419                 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1420                     ipv6_addr_equal(&ifp->addr, &addr)) {
1421                         /* DAD failed for link-local based on MAC address */
1422                         idev->cnf.disable_ipv6 = 1;
1423
1424                         printk(KERN_INFO "%s: IPv6 being disabled!\n",
1425                                 ifp->idev->dev->name);
1426                 }
1427         }
1428
1429         addrconf_dad_stop(ifp, 1);
1430 }
1431
1432 /* Join to solicited addr multicast group. */
1433
1434 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1435 {
1436         struct in6_addr maddr;
1437
1438         if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1439                 return;
1440
1441         addrconf_addr_solict_mult(addr, &maddr);
1442         ipv6_dev_mc_inc(dev, &maddr);
1443 }
1444
1445 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1446 {
1447         struct in6_addr maddr;
1448
1449         if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1450                 return;
1451
1452         addrconf_addr_solict_mult(addr, &maddr);
1453         __ipv6_dev_mc_dec(idev, &maddr);
1454 }
1455
1456 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1457 {
1458         struct in6_addr addr;
1459         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1460         if (ipv6_addr_any(&addr))
1461                 return;
1462         ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1463 }
1464
1465 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1466 {
1467         struct in6_addr addr;
1468         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1469         if (ipv6_addr_any(&addr))
1470                 return;
1471         __ipv6_dev_ac_dec(ifp->idev, &addr);
1472 }
1473
1474 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1475 {
1476         if (dev->addr_len != ETH_ALEN)
1477                 return -1;
1478         memcpy(eui, dev->dev_addr, 3);
1479         memcpy(eui + 5, dev->dev_addr + 3, 3);
1480
1481         /*
1482          * The zSeries OSA network cards can be shared among various
1483          * OS instances, but the OSA cards have only one MAC address.
1484          * This leads to duplicate address conflicts in conjunction
1485          * with IPv6 if more than one instance uses the same card.
1486          *
1487          * The driver for these cards can deliver a unique 16-bit
1488          * identifier for each instance sharing the same card.  It is
1489          * placed instead of 0xFFFE in the interface identifier.  The
1490          * "u" bit of the interface identifier is not inverted in this
1491          * case.  Hence the resulting interface identifier has local
1492          * scope according to RFC2373.
1493          */
1494         if (dev->dev_id) {
1495                 eui[3] = (dev->dev_id >> 8) & 0xFF;
1496                 eui[4] = dev->dev_id & 0xFF;
1497         } else {
1498                 eui[3] = 0xFF;
1499                 eui[4] = 0xFE;
1500                 eui[0] ^= 2;
1501         }
1502         return 0;
1503 }
1504
1505 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1506 {
1507         /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1508         if (dev->addr_len != ARCNET_ALEN)
1509                 return -1;
1510         memset(eui, 0, 7);
1511         eui[7] = *(u8*)dev->dev_addr;
1512         return 0;
1513 }
1514
1515 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1516 {
1517         if (dev->addr_len != INFINIBAND_ALEN)
1518                 return -1;
1519         memcpy(eui, dev->dev_addr + 12, 8);
1520         eui[0] |= 2;
1521         return 0;
1522 }
1523
1524 int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1525 {
1526         if (addr == 0)
1527                 return -1;
1528         eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1529                   ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1530                   ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1531                   ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1532                   ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1533                   ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1534         eui[1] = 0;
1535         eui[2] = 0x5E;
1536         eui[3] = 0xFE;
1537         memcpy(eui + 4, &addr, 4);
1538         return 0;
1539 }
1540 EXPORT_SYMBOL(__ipv6_isatap_ifid);
1541
1542 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1543 {
1544         if (dev->priv_flags & IFF_ISATAP)
1545                 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1546         return -1;
1547 }
1548
1549 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1550 {
1551         switch (dev->type) {
1552         case ARPHRD_ETHER:
1553         case ARPHRD_FDDI:
1554         case ARPHRD_IEEE802_TR:
1555                 return addrconf_ifid_eui48(eui, dev);
1556         case ARPHRD_ARCNET:
1557                 return addrconf_ifid_arcnet(eui, dev);
1558         case ARPHRD_INFINIBAND:
1559                 return addrconf_ifid_infiniband(eui, dev);
1560         case ARPHRD_SIT:
1561                 return addrconf_ifid_sit(eui, dev);
1562         }
1563         return -1;
1564 }
1565
1566 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1567 {
1568         int err = -1;
1569         struct inet6_ifaddr *ifp;
1570
1571         read_lock_bh(&idev->lock);
1572         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1573                 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1574                         memcpy(eui, ifp->addr.s6_addr+8, 8);
1575                         err = 0;
1576                         break;
1577                 }
1578         }
1579         read_unlock_bh(&idev->lock);
1580         return err;
1581 }
1582
1583 #ifdef CONFIG_IPV6_PRIVACY
1584 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1585 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1586 {
1587 regen:
1588         get_random_bytes(idev->rndid, sizeof(idev->rndid));
1589         idev->rndid[0] &= ~0x02;
1590
1591         /*
1592          * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1593          * check if generated address is not inappropriate
1594          *
1595          *  - Reserved subnet anycast (RFC 2526)
1596          *      11111101 11....11 1xxxxxxx
1597          *  - ISATAP (RFC4214) 6.1
1598          *      00-00-5E-FE-xx-xx-xx-xx
1599          *  - value 0
1600          *  - XXX: already assigned to an address on the device
1601          */
1602         if (idev->rndid[0] == 0xfd &&
1603             (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1604             (idev->rndid[7]&0x80))
1605                 goto regen;
1606         if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1607                 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1608                         goto regen;
1609                 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1610                         goto regen;
1611         }
1612
1613         return 0;
1614 }
1615
1616 static void ipv6_regen_rndid(unsigned long data)
1617 {
1618         struct inet6_dev *idev = (struct inet6_dev *) data;
1619         unsigned long expires;
1620
1621         rcu_read_lock_bh();
1622         write_lock_bh(&idev->lock);
1623
1624         if (idev->dead)
1625                 goto out;
1626
1627         if (__ipv6_regen_rndid(idev) < 0)
1628                 goto out;
1629
1630         expires = jiffies +
1631                 idev->cnf.temp_prefered_lft * HZ -
1632                 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1633         if (time_before(expires, jiffies)) {
1634                 printk(KERN_WARNING
1635                         "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1636                         idev->dev->name);
1637                 goto out;
1638         }
1639
1640         if (!mod_timer(&idev->regen_timer, expires))
1641                 in6_dev_hold(idev);
1642
1643 out:
1644         write_unlock_bh(&idev->lock);
1645         rcu_read_unlock_bh();
1646         in6_dev_put(idev);
1647 }
1648
1649 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1650         int ret = 0;
1651
1652         if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1653                 ret = __ipv6_regen_rndid(idev);
1654         return ret;
1655 }
1656 #endif
1657
1658 /*
1659  *      Add prefix route.
1660  */
1661
1662 static void
1663 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1664                       unsigned long expires, u32 flags)
1665 {
1666         struct fib6_config cfg = {
1667                 .fc_table = RT6_TABLE_PREFIX,
1668                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1669                 .fc_ifindex = dev->ifindex,
1670                 .fc_expires = expires,
1671                 .fc_dst_len = plen,
1672                 .fc_flags = RTF_UP | flags,
1673                 .fc_nlinfo.nl_net = dev_net(dev),
1674                 .fc_protocol = RTPROT_KERNEL,
1675         };
1676
1677         ipv6_addr_copy(&cfg.fc_dst, pfx);
1678
1679         /* Prevent useless cloning on PtP SIT.
1680            This thing is done here expecting that the whole
1681            class of non-broadcast devices need not cloning.
1682          */
1683 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1684         if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1685                 cfg.fc_flags |= RTF_NONEXTHOP;
1686 #endif
1687
1688         ip6_route_add(&cfg);
1689 }
1690
1691 /* Create "default" multicast route to the interface */
1692
1693 static void addrconf_add_mroute(struct net_device *dev)
1694 {
1695         struct fib6_config cfg = {
1696                 .fc_table = RT6_TABLE_LOCAL,
1697                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1698                 .fc_ifindex = dev->ifindex,
1699                 .fc_dst_len = 8,
1700                 .fc_flags = RTF_UP,
1701                 .fc_nlinfo.nl_net = dev_net(dev),
1702         };
1703
1704         ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1705
1706         ip6_route_add(&cfg);
1707 }
1708
1709 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1710 static void sit_route_add(struct net_device *dev)
1711 {
1712         struct fib6_config cfg = {
1713                 .fc_table = RT6_TABLE_MAIN,
1714                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1715                 .fc_ifindex = dev->ifindex,
1716                 .fc_dst_len = 96,
1717                 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1718                 .fc_nlinfo.nl_net = dev_net(dev),
1719         };
1720
1721         /* prefix length - 96 bits "::d.d.d.d" */
1722         ip6_route_add(&cfg);
1723 }
1724 #endif
1725
1726 static void addrconf_add_lroute(struct net_device *dev)
1727 {
1728         struct in6_addr addr;
1729
1730         ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
1731         addrconf_prefix_route(&addr, 64, dev, 0, 0);
1732 }
1733
1734 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1735 {
1736         struct inet6_dev *idev;
1737
1738         ASSERT_RTNL();
1739
1740         if ((idev = ipv6_find_idev(dev)) == NULL)
1741                 return NULL;
1742
1743         /* Add default multicast route */
1744         addrconf_add_mroute(dev);
1745
1746         /* Add link local route */
1747         addrconf_add_lroute(dev);
1748         return idev;
1749 }
1750
1751 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1752 {
1753         struct prefix_info *pinfo;
1754         __u32 valid_lft;
1755         __u32 prefered_lft;
1756         int addr_type;
1757         struct inet6_dev *in6_dev;
1758         struct net *net = dev_net(dev);
1759
1760         pinfo = (struct prefix_info *) opt;
1761
1762         if (len < sizeof(struct prefix_info)) {
1763                 ADBG(("addrconf: prefix option too short\n"));
1764                 return;
1765         }
1766
1767         /*
1768          *      Validation checks ([ADDRCONF], page 19)
1769          */
1770
1771         addr_type = ipv6_addr_type(&pinfo->prefix);
1772
1773         if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1774                 return;
1775
1776         valid_lft = ntohl(pinfo->valid);
1777         prefered_lft = ntohl(pinfo->prefered);
1778
1779         if (prefered_lft > valid_lft) {
1780                 if (net_ratelimit())
1781                         printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1782                 return;
1783         }
1784
1785         in6_dev = in6_dev_get(dev);
1786
1787         if (in6_dev == NULL) {
1788                 if (net_ratelimit())
1789                         printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1790                 return;
1791         }
1792
1793         /*
1794          *      Two things going on here:
1795          *      1) Add routes for on-link prefixes
1796          *      2) Configure prefixes with the auto flag set
1797          */
1798
1799         if (pinfo->onlink) {
1800                 struct rt6_info *rt;
1801                 unsigned long rt_expires;
1802
1803                 /* Avoid arithmetic overflow. Really, we could
1804                  * save rt_expires in seconds, likely valid_lft,
1805                  * but it would require division in fib gc, that it
1806                  * not good.
1807                  */
1808                 if (HZ > USER_HZ)
1809                         rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
1810                 else
1811                         rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
1812
1813                 if (addrconf_finite_timeout(rt_expires))
1814                         rt_expires *= HZ;
1815
1816                 rt = rt6_lookup(net, &pinfo->prefix, NULL,
1817                                 dev->ifindex, 1);
1818
1819                 if (rt && addrconf_is_prefix_route(rt)) {
1820                         /* Autoconf prefix route */
1821                         if (valid_lft == 0) {
1822                                 ip6_del_rt(rt);
1823                                 rt = NULL;
1824                         } else if (addrconf_finite_timeout(rt_expires)) {
1825                                 /* not infinity */
1826                                 rt->rt6i_expires = jiffies + rt_expires;
1827                                 rt->rt6i_flags |= RTF_EXPIRES;
1828                         } else {
1829                                 rt->rt6i_flags &= ~RTF_EXPIRES;
1830                                 rt->rt6i_expires = 0;
1831                         }
1832                 } else if (valid_lft) {
1833                         clock_t expires = 0;
1834                         int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
1835                         if (addrconf_finite_timeout(rt_expires)) {
1836                                 /* not infinity */
1837                                 flags |= RTF_EXPIRES;
1838                                 expires = jiffies_to_clock_t(rt_expires);
1839                         }
1840                         addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1841                                               dev, expires, flags);
1842                 }
1843                 if (rt)
1844                         dst_release(&rt->u.dst);
1845         }
1846
1847         /* Try to figure out our local address for this prefix */
1848
1849         if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1850                 struct inet6_ifaddr * ifp;
1851                 struct in6_addr addr;
1852                 int create = 0, update_lft = 0;
1853
1854                 if (pinfo->prefix_len == 64) {
1855                         memcpy(&addr, &pinfo->prefix, 8);
1856                         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1857                             ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1858                                 in6_dev_put(in6_dev);
1859                                 return;
1860                         }
1861                         goto ok;
1862                 }
1863                 if (net_ratelimit())
1864                         printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1865                                pinfo->prefix_len);
1866                 in6_dev_put(in6_dev);
1867                 return;
1868
1869 ok:
1870
1871                 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1872
1873                 if (ifp == NULL && valid_lft) {
1874                         int max_addresses = in6_dev->cnf.max_addresses;
1875                         u32 addr_flags = 0;
1876
1877 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1878                         if (in6_dev->cnf.optimistic_dad &&
1879                             !net->ipv6.devconf_all->forwarding)
1880                                 addr_flags = IFA_F_OPTIMISTIC;
1881 #endif
1882
1883                         /* Do not allow to create too much of autoconfigured
1884                          * addresses; this would be too easy way to crash kernel.
1885                          */
1886                         if (!max_addresses ||
1887                             ipv6_count_addresses(in6_dev) < max_addresses)
1888                                 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1889                                                     addr_type&IPV6_ADDR_SCOPE_MASK,
1890                                                     addr_flags);
1891
1892                         if (!ifp || IS_ERR(ifp)) {
1893                                 in6_dev_put(in6_dev);
1894                                 return;
1895                         }
1896
1897                         update_lft = create = 1;
1898                         ifp->cstamp = jiffies;
1899                         addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1900                 }
1901
1902                 if (ifp) {
1903                         int flags;
1904                         unsigned long now;
1905 #ifdef CONFIG_IPV6_PRIVACY
1906                         struct inet6_ifaddr *ift;
1907 #endif
1908                         u32 stored_lft;
1909
1910                         /* update lifetime (RFC2462 5.5.3 e) */
1911                         spin_lock(&ifp->lock);
1912                         now = jiffies;
1913                         if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1914                                 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1915                         else
1916                                 stored_lft = 0;
1917                         if (!update_lft && stored_lft) {
1918                                 if (valid_lft > MIN_VALID_LIFETIME ||
1919                                     valid_lft > stored_lft)
1920                                         update_lft = 1;
1921                                 else if (stored_lft <= MIN_VALID_LIFETIME) {
1922                                         /* valid_lft <= stored_lft is always true */
1923                                         /*
1924                                          * RFC 4862 Section 5.5.3e:
1925                                          * "Note that the preferred lifetime of
1926                                          *  the corresponding address is always
1927                                          *  reset to the Preferred Lifetime in
1928                                          *  the received Prefix Information
1929                                          *  option, regardless of whether the
1930                                          *  valid lifetime is also reset or
1931                                          *  ignored."
1932                                          *
1933                                          *  So if the preferred lifetime in
1934                                          *  this advertisement is different
1935                                          *  than what we have stored, but the
1936                                          *  valid lifetime is invalid, just
1937                                          *  reset prefered_lft.
1938                                          *
1939                                          *  We must set the valid lifetime
1940                                          *  to the stored lifetime since we'll
1941                                          *  be updating the timestamp below,
1942                                          *  else we'll set it back to the
1943                                          *  minumum.
1944                                          */
1945                                         if (prefered_lft != ifp->prefered_lft) {
1946                                                 valid_lft = stored_lft;
1947                                                 update_lft = 1;
1948                                         }
1949                                 } else {
1950                                         valid_lft = MIN_VALID_LIFETIME;
1951                                         if (valid_lft < prefered_lft)
1952                                                 prefered_lft = valid_lft;
1953                                         update_lft = 1;
1954                                 }
1955                         }
1956
1957                         if (update_lft) {
1958                                 ifp->valid_lft = valid_lft;
1959                                 ifp->prefered_lft = prefered_lft;
1960                                 ifp->tstamp = now;
1961                                 flags = ifp->flags;
1962                                 ifp->flags &= ~IFA_F_DEPRECATED;
1963                                 spin_unlock(&ifp->lock);
1964
1965                                 if (!(flags&IFA_F_TENTATIVE))
1966                                         ipv6_ifa_notify(0, ifp);
1967                         } else
1968                                 spin_unlock(&ifp->lock);
1969
1970 #ifdef CONFIG_IPV6_PRIVACY
1971                         read_lock_bh(&in6_dev->lock);
1972                         /* update all temporary addresses in the list */
1973                         for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1974                                 /*
1975                                  * When adjusting the lifetimes of an existing
1976                                  * temporary address, only lower the lifetimes.
1977                                  * Implementations must not increase the
1978                                  * lifetimes of an existing temporary address
1979                                  * when processing a Prefix Information Option.
1980                                  */
1981                                 if (ifp != ift->ifpub)
1982                                         continue;
1983
1984                                 spin_lock(&ift->lock);
1985                                 flags = ift->flags;
1986                                 if (ift->valid_lft > valid_lft &&
1987                                     ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1988                                         ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1989                                 if (ift->prefered_lft > prefered_lft &&
1990                                     ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1991                                         ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1992                                 spin_unlock(&ift->lock);
1993                                 if (!(flags&IFA_F_TENTATIVE))
1994                                         ipv6_ifa_notify(0, ift);
1995                         }
1996
1997                         if (create && in6_dev->cnf.use_tempaddr > 0) {
1998                                 /*
1999                                  * When a new public address is created as described in [ADDRCONF],
2000                                  * also create a new temporary address.
2001                                  */
2002                                 read_unlock_bh(&in6_dev->lock);
2003                                 ipv6_create_tempaddr(ifp, NULL);
2004                         } else {
2005                                 read_unlock_bh(&in6_dev->lock);
2006                         }
2007 #endif
2008                         in6_ifa_put(ifp);
2009                         addrconf_verify(0);
2010                 }
2011         }
2012         inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2013         in6_dev_put(in6_dev);
2014 }
2015
2016 /*
2017  *      Set destination address.
2018  *      Special case for SIT interfaces where we create a new "virtual"
2019  *      device.
2020  */
2021 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2022 {
2023         struct in6_ifreq ireq;
2024         struct net_device *dev;
2025         int err = -EINVAL;
2026
2027         rtnl_lock();
2028
2029         err = -EFAULT;
2030         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2031                 goto err_exit;
2032
2033         dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2034
2035         err = -ENODEV;
2036         if (dev == NULL)
2037                 goto err_exit;
2038
2039 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2040         if (dev->type == ARPHRD_SIT) {
2041                 const struct net_device_ops *ops = dev->netdev_ops;
2042                 struct ifreq ifr;
2043                 struct ip_tunnel_parm p;
2044
2045                 err = -EADDRNOTAVAIL;
2046                 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2047                         goto err_exit;
2048
2049                 memset(&p, 0, sizeof(p));
2050                 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2051                 p.iph.saddr = 0;
2052                 p.iph.version = 4;
2053                 p.iph.ihl = 5;
2054                 p.iph.protocol = IPPROTO_IPV6;
2055                 p.iph.ttl = 64;
2056                 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2057
2058                 if (ops->ndo_do_ioctl) {
2059                         mm_segment_t oldfs = get_fs();
2060
2061                         set_fs(KERNEL_DS);
2062                         err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2063                         set_fs(oldfs);
2064                 } else
2065                         err = -EOPNOTSUPP;
2066
2067                 if (err == 0) {
2068                         err = -ENOBUFS;
2069                         dev = __dev_get_by_name(net, p.name);
2070                         if (!dev)
2071                                 goto err_exit;
2072                         err = dev_open(dev);
2073                 }
2074         }
2075 #endif
2076
2077 err_exit:
2078         rtnl_unlock();
2079         return err;
2080 }
2081
2082 /*
2083  *      Manual configuration of address on an interface
2084  */
2085 static int inet6_addr_add(struct net *net, int ifindex, struct in6_addr *pfx,
2086                           unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
2087                           __u32 valid_lft)
2088 {
2089         struct inet6_ifaddr *ifp;
2090         struct inet6_dev *idev;
2091         struct net_device *dev;
2092         int scope;
2093         u32 flags;
2094         clock_t expires;
2095         unsigned long timeout;
2096
2097         ASSERT_RTNL();
2098
2099         if (plen > 128)
2100                 return -EINVAL;
2101
2102         /* check the lifetime */
2103         if (!valid_lft || prefered_lft > valid_lft)
2104                 return -EINVAL;
2105
2106         dev = __dev_get_by_index(net, ifindex);
2107         if (!dev)
2108                 return -ENODEV;
2109
2110         if ((idev = addrconf_add_dev(dev)) == NULL)
2111                 return -ENOBUFS;
2112
2113         scope = ipv6_addr_scope(pfx);
2114
2115         timeout = addrconf_timeout_fixup(valid_lft, HZ);
2116         if (addrconf_finite_timeout(timeout)) {
2117                 expires = jiffies_to_clock_t(timeout * HZ);
2118                 valid_lft = timeout;
2119                 flags = RTF_EXPIRES;
2120         } else {
2121                 expires = 0;
2122                 flags = 0;
2123                 ifa_flags |= IFA_F_PERMANENT;
2124         }
2125
2126         timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2127         if (addrconf_finite_timeout(timeout)) {
2128                 if (timeout == 0)
2129                         ifa_flags |= IFA_F_DEPRECATED;
2130                 prefered_lft = timeout;
2131         }
2132
2133         ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2134
2135         if (!IS_ERR(ifp)) {
2136                 spin_lock_bh(&ifp->lock);
2137                 ifp->valid_lft = valid_lft;
2138                 ifp->prefered_lft = prefered_lft;
2139                 ifp->tstamp = jiffies;
2140                 spin_unlock_bh(&ifp->lock);
2141
2142                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2143                                       expires, flags);
2144                 /*
2145                  * Note that section 3.1 of RFC 4429 indicates
2146                  * that the Optimistic flag should not be set for
2147                  * manually configured addresses
2148                  */
2149                 addrconf_dad_start(ifp, 0);
2150                 in6_ifa_put(ifp);
2151                 addrconf_verify(0);
2152                 return 0;
2153         }
2154
2155         return PTR_ERR(ifp);
2156 }
2157
2158 static int inet6_addr_del(struct net *net, int ifindex, struct in6_addr *pfx,
2159                           unsigned int plen)
2160 {
2161         struct inet6_ifaddr *ifp;
2162         struct inet6_dev *idev;
2163         struct net_device *dev;
2164
2165         if (plen > 128)
2166                 return -EINVAL;
2167
2168         dev = __dev_get_by_index(net, ifindex);
2169         if (!dev)
2170                 return -ENODEV;
2171
2172         if ((idev = __in6_dev_get(dev)) == NULL)
2173                 return -ENXIO;
2174
2175         read_lock_bh(&idev->lock);
2176         for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
2177                 if (ifp->prefix_len == plen &&
2178                     ipv6_addr_equal(pfx, &ifp->addr)) {
2179                         in6_ifa_hold(ifp);
2180                         read_unlock_bh(&idev->lock);
2181
2182                         ipv6_del_addr(ifp);
2183
2184                         /* If the last address is deleted administratively,
2185                            disable IPv6 on this interface.
2186                          */
2187                         if (idev->addr_list == NULL)
2188                                 addrconf_ifdown(idev->dev, 1);
2189                         return 0;
2190                 }
2191         }
2192         read_unlock_bh(&idev->lock);
2193         return -EADDRNOTAVAIL;
2194 }
2195
2196
2197 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2198 {
2199         struct in6_ifreq ireq;
2200         int err;
2201
2202         if (!capable(CAP_NET_ADMIN))
2203                 return -EPERM;
2204
2205         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2206                 return -EFAULT;
2207
2208         rtnl_lock();
2209         err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2210                              ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2211                              INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2212         rtnl_unlock();
2213         return err;
2214 }
2215
2216 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2217 {
2218         struct in6_ifreq ireq;
2219         int err;
2220
2221         if (!capable(CAP_NET_ADMIN))
2222                 return -EPERM;
2223
2224         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2225                 return -EFAULT;
2226
2227         rtnl_lock();
2228         err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2229                              ireq.ifr6_prefixlen);
2230         rtnl_unlock();
2231         return err;
2232 }
2233
2234 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2235                      int plen, int scope)
2236 {
2237         struct inet6_ifaddr *ifp;
2238
2239         ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT);
2240         if (!IS_ERR(ifp)) {
2241                 spin_lock_bh(&ifp->lock);
2242                 ifp->flags &= ~IFA_F_TENTATIVE;
2243                 spin_unlock_bh(&ifp->lock);
2244                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2245                 in6_ifa_put(ifp);
2246         }
2247 }
2248
2249 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2250 static void sit_add_v4_addrs(struct inet6_dev *idev)
2251 {
2252         struct in6_addr addr;
2253         struct net_device *dev;
2254         struct net *net = dev_net(idev->dev);
2255         int scope;
2256
2257         ASSERT_RTNL();
2258
2259         memset(&addr, 0, sizeof(struct in6_addr));
2260         memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2261
2262         if (idev->dev->flags&IFF_POINTOPOINT) {
2263                 addr.s6_addr32[0] = htonl(0xfe800000);
2264                 scope = IFA_LINK;
2265         } else {
2266                 scope = IPV6_ADDR_COMPATv4;
2267         }
2268
2269         if (addr.s6_addr32[3]) {
2270                 add_addr(idev, &addr, 128, scope);
2271                 return;
2272         }
2273
2274         for_each_netdev(net, dev) {
2275                 struct in_device * in_dev = __in_dev_get_rtnl(dev);
2276                 if (in_dev && (dev->flags & IFF_UP)) {
2277                         struct in_ifaddr * ifa;
2278
2279                         int flag = scope;
2280
2281                         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2282                                 int plen;
2283
2284                                 addr.s6_addr32[3] = ifa->ifa_local;
2285
2286                                 if (ifa->ifa_scope == RT_SCOPE_LINK)
2287                                         continue;
2288                                 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2289                                         if (idev->dev->flags&IFF_POINTOPOINT)
2290                                                 continue;
2291                                         flag |= IFA_HOST;
2292                                 }
2293                                 if (idev->dev->flags&IFF_POINTOPOINT)
2294                                         plen = 64;
2295                                 else
2296                                         plen = 96;
2297
2298                                 add_addr(idev, &addr, plen, flag);
2299                         }
2300                 }
2301         }
2302 }
2303 #endif
2304
2305 static void init_loopback(struct net_device *dev)
2306 {
2307         struct inet6_dev  *idev;
2308
2309         /* ::1 */
2310
2311         ASSERT_RTNL();
2312
2313         if ((idev = ipv6_find_idev(dev)) == NULL) {
2314                 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2315                 return;
2316         }
2317
2318         add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2319 }
2320
2321 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2322 {
2323         struct inet6_ifaddr * ifp;
2324         u32 addr_flags = IFA_F_PERMANENT;
2325
2326 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2327         if (idev->cnf.optimistic_dad &&
2328             !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2329                 addr_flags |= IFA_F_OPTIMISTIC;
2330 #endif
2331
2332
2333         ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2334         if (!IS_ERR(ifp)) {
2335                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2336                 addrconf_dad_start(ifp, 0);
2337                 in6_ifa_put(ifp);
2338         }
2339 }
2340
2341 static void addrconf_dev_config(struct net_device *dev)
2342 {
2343         struct in6_addr addr;
2344         struct inet6_dev    * idev;
2345
2346         ASSERT_RTNL();
2347
2348         if ((dev->type != ARPHRD_ETHER) &&
2349             (dev->type != ARPHRD_FDDI) &&
2350             (dev->type != ARPHRD_IEEE802_TR) &&
2351             (dev->type != ARPHRD_ARCNET) &&
2352             (dev->type != ARPHRD_INFINIBAND)) {
2353                 /* Alas, we support only Ethernet autoconfiguration. */
2354                 return;
2355         }
2356
2357         idev = addrconf_add_dev(dev);
2358         if (idev == NULL)
2359                 return;
2360
2361         memset(&addr, 0, sizeof(struct in6_addr));
2362         addr.s6_addr32[0] = htonl(0xFE800000);
2363
2364         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2365                 addrconf_add_linklocal(idev, &addr);
2366 }
2367
2368 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2369 static void addrconf_sit_config(struct net_device *dev)
2370 {
2371         struct inet6_dev *idev;
2372
2373         ASSERT_RTNL();
2374
2375         /*
2376          * Configure the tunnel with one of our IPv4
2377          * addresses... we should configure all of
2378          * our v4 addrs in the tunnel
2379          */
2380
2381         if ((idev = ipv6_find_idev(dev)) == NULL) {
2382                 printk(KERN_DEBUG "init sit: add_dev failed\n");
2383                 return;
2384         }
2385
2386         if (dev->priv_flags & IFF_ISATAP) {
2387                 struct in6_addr addr;
2388
2389                 ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
2390                 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2391                 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2392                         addrconf_add_linklocal(idev, &addr);
2393                 return;
2394         }
2395
2396         sit_add_v4_addrs(idev);
2397
2398         if (dev->flags&IFF_POINTOPOINT) {
2399                 addrconf_add_mroute(dev);
2400                 addrconf_add_lroute(dev);
2401         } else
2402                 sit_route_add(dev);
2403 }
2404 #endif
2405
2406 static inline int
2407 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2408 {
2409         struct in6_addr lladdr;
2410
2411         if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2412                 addrconf_add_linklocal(idev, &lladdr);
2413                 return 0;
2414         }
2415         return -1;
2416 }
2417
2418 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2419 {
2420         struct net_device *link_dev;
2421         struct net *net = dev_net(idev->dev);
2422
2423         /* first try to inherit the link-local address from the link device */
2424         if (idev->dev->iflink &&
2425             (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
2426                 if (!ipv6_inherit_linklocal(idev, link_dev))
2427                         return;
2428         }
2429         /* then try to inherit it from any device */
2430         for_each_netdev(net, link_dev) {
2431                 if (!ipv6_inherit_linklocal(idev, link_dev))
2432                         return;
2433         }
2434         printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2435 }
2436
2437 /*
2438  * Autoconfigure tunnel with a link-local address so routing protocols,
2439  * DHCPv6, MLD etc. can be run over the virtual link
2440  */
2441
2442 static void addrconf_ip6_tnl_config(struct net_device *dev)
2443 {
2444         struct inet6_dev *idev;
2445
2446         ASSERT_RTNL();
2447
2448         if ((idev = addrconf_add_dev(dev)) == NULL) {
2449                 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2450                 return;
2451         }
2452         ip6_tnl_add_linklocal(idev);
2453 }
2454
2455 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2456                            void * data)
2457 {
2458         struct net_device *dev = (struct net_device *) data;
2459         struct inet6_dev *idev = __in6_dev_get(dev);
2460         int run_pending = 0;
2461         int err;
2462
2463         switch(event) {
2464         case NETDEV_REGISTER:
2465                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2466                         idev = ipv6_add_dev(dev);
2467                         if (!idev)
2468                                 return notifier_from_errno(-ENOMEM);
2469                 }
2470                 break;
2471         case NETDEV_UP:
2472         case NETDEV_CHANGE:
2473                 if (dev->flags & IFF_SLAVE)
2474                         break;
2475
2476                 if (event == NETDEV_UP) {
2477                         if (!addrconf_qdisc_ok(dev)) {
2478                                 /* device is not ready yet. */
2479                                 printk(KERN_INFO
2480                                         "ADDRCONF(NETDEV_UP): %s: "
2481                                         "link is not ready\n",
2482                                         dev->name);
2483                                 break;
2484                         }
2485
2486                         if (!idev && dev->mtu >= IPV6_MIN_MTU)
2487                                 idev = ipv6_add_dev(dev);
2488
2489                         if (idev) {
2490                                 idev->if_flags |= IF_READY;
2491                                 run_pending = 1;
2492                         }
2493                 } else {
2494                         if (!addrconf_qdisc_ok(dev)) {
2495                                 /* device is still not ready. */
2496                                 break;
2497                         }
2498
2499                         if (idev) {
2500                                 if (idev->if_flags & IF_READY) {
2501                                         /* device is already configured. */
2502                                         break;
2503                                 }
2504                                 idev->if_flags |= IF_READY;
2505                         }
2506
2507                         printk(KERN_INFO
2508                                         "ADDRCONF(NETDEV_CHANGE): %s: "
2509                                         "link becomes ready\n",
2510                                         dev->name);
2511
2512                         run_pending = 1;
2513                 }
2514
2515                 switch(dev->type) {
2516 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2517                 case ARPHRD_SIT:
2518                         addrconf_sit_config(dev);
2519                         break;
2520 #endif
2521                 case ARPHRD_TUNNEL6:
2522                         addrconf_ip6_tnl_config(dev);
2523                         break;
2524                 case ARPHRD_LOOPBACK:
2525                         init_loopback(dev);
2526                         break;
2527
2528                 default:
2529                         addrconf_dev_config(dev);
2530                         break;
2531                 }
2532                 if (idev) {
2533                         if (run_pending)
2534                                 addrconf_dad_run(idev);
2535
2536                         /* If the MTU changed during the interface down, when the
2537                            interface up, the changed MTU must be reflected in the
2538                            idev as well as routers.
2539                          */
2540                         if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2541                                 rt6_mtu_change(dev, dev->mtu);
2542                                 idev->cnf.mtu6 = dev->mtu;
2543                         }
2544                         idev->tstamp = jiffies;
2545                         inet6_ifinfo_notify(RTM_NEWLINK, idev);
2546                         /* If the changed mtu during down is lower than IPV6_MIN_MTU
2547                            stop IPv6 on this interface.
2548                          */
2549                         if (dev->mtu < IPV6_MIN_MTU)
2550                                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2551                 }
2552                 break;
2553
2554         case NETDEV_CHANGEMTU:
2555                 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2556                         rt6_mtu_change(dev, dev->mtu);
2557                         idev->cnf.mtu6 = dev->mtu;
2558                         break;
2559                 }
2560
2561                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2562                         idev = ipv6_add_dev(dev);
2563                         if (idev)
2564                                 break;
2565                 }
2566
2567                 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2568
2569         case NETDEV_DOWN:
2570         case NETDEV_UNREGISTER:
2571                 /*
2572                  *      Remove all addresses from this interface.
2573                  */
2574                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2575                 break;
2576
2577         case NETDEV_CHANGENAME:
2578                 if (idev) {
2579                         snmp6_unregister_dev(idev);
2580                         addrconf_sysctl_unregister(idev);
2581                         addrconf_sysctl_register(idev);
2582                         err = snmp6_register_dev(idev);
2583                         if (err)
2584                                 return notifier_from_errno(err);
2585                 }
2586                 break;
2587         case NETDEV_BONDING_OLDTYPE:
2588         case NETDEV_BONDING_NEWTYPE:
2589                 addrconf_bonding_change(dev, event);
2590                 break;
2591         }
2592
2593         return NOTIFY_OK;
2594 }
2595
2596 /*
2597  *      addrconf module should be notified of a device going up
2598  */
2599 static struct notifier_block ipv6_dev_notf = {
2600         .notifier_call = addrconf_notify,
2601         .priority = 0
2602 };
2603
2604 static void addrconf_bonding_change(struct net_device *dev, unsigned long event)
2605 {
2606         struct inet6_dev *idev;
2607         ASSERT_RTNL();
2608
2609         idev = __in6_dev_get(dev);
2610
2611         if (event == NETDEV_BONDING_NEWTYPE)
2612                 ipv6_mc_remap(idev);
2613         else if (event == NETDEV_BONDING_OLDTYPE)
2614                 ipv6_mc_unmap(idev);
2615 }
2616
2617 static int addrconf_ifdown(struct net_device *dev, int how)
2618 {
2619         struct inet6_dev *idev;
2620         struct inet6_ifaddr *ifa, **bifa;
2621         struct net *net = dev_net(dev);
2622         int i;
2623
2624         ASSERT_RTNL();
2625
2626         rt6_ifdown(net, dev);
2627         neigh_ifdown(&nd_tbl, dev);
2628
2629         idev = __in6_dev_get(dev);
2630         if (idev == NULL)
2631                 return -ENODEV;
2632
2633         /* Step 1: remove reference to ipv6 device from parent device.
2634                    Do not dev_put!
2635          */
2636         if (how) {
2637                 idev->dead = 1;
2638
2639                 /* protected by rtnl_lock */
2640                 rcu_assign_pointer(dev->ip6_ptr, NULL);
2641
2642                 /* Step 1.5: remove snmp6 entry */
2643                 snmp6_unregister_dev(idev);
2644
2645         }
2646
2647         /* Step 2: clear hash table */
2648         for (i=0; i<IN6_ADDR_HSIZE; i++) {
2649                 bifa = &inet6_addr_lst[i];
2650
2651                 write_lock_bh(&addrconf_hash_lock);
2652                 while ((ifa = *bifa) != NULL) {
2653                         if (ifa->idev == idev) {
2654                                 *bifa = ifa->lst_next;
2655                                 ifa->lst_next = NULL;
2656                                 addrconf_del_timer(ifa);
2657                                 in6_ifa_put(ifa);
2658                                 continue;
2659                         }
2660                         bifa = &ifa->lst_next;
2661                 }
2662                 write_unlock_bh(&addrconf_hash_lock);
2663         }
2664
2665         write_lock_bh(&idev->lock);
2666
2667         /* Step 3: clear flags for stateless addrconf */
2668         if (!how)
2669                 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2670
2671         /* Step 4: clear address list */
2672 #ifdef CONFIG_IPV6_PRIVACY
2673         if (how && del_timer(&idev->regen_timer))
2674                 in6_dev_put(idev);
2675
2676         /* clear tempaddr list */
2677         while ((ifa = idev->tempaddr_list) != NULL) {
2678                 idev->tempaddr_list = ifa->tmp_next;
2679                 ifa->tmp_next = NULL;
2680                 ifa->dead = 1;
2681                 write_unlock_bh(&idev->lock);
2682                 spin_lock_bh(&ifa->lock);
2683
2684                 if (ifa->ifpub) {
2685                         in6_ifa_put(ifa->ifpub);
2686                         ifa->ifpub = NULL;
2687                 }
2688                 spin_unlock_bh(&ifa->lock);
2689                 in6_ifa_put(ifa);
2690                 write_lock_bh(&idev->lock);
2691         }
2692 #endif
2693         while ((ifa = idev->addr_list) != NULL) {
2694                 idev->addr_list = ifa->if_next;
2695                 ifa->if_next = NULL;
2696                 ifa->dead = 1;
2697                 addrconf_del_timer(ifa);
2698                 write_unlock_bh(&idev->lock);
2699
2700                 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2701                 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2702                 in6_ifa_put(ifa);
2703
2704                 write_lock_bh(&idev->lock);
2705         }
2706         write_unlock_bh(&idev->lock);
2707
2708         /* Step 5: Discard multicast list */
2709
2710         if (how)
2711                 ipv6_mc_destroy_dev(idev);
2712         else
2713                 ipv6_mc_down(idev);
2714
2715         idev->tstamp = jiffies;
2716
2717         /* Shot the device (if unregistered) */
2718
2719         if (how) {
2720                 addrconf_sysctl_unregister(idev);
2721                 neigh_parms_release(&nd_tbl, idev->nd_parms);
2722                 neigh_ifdown(&nd_tbl, dev);
2723                 in6_dev_put(idev);
2724         }
2725         return 0;
2726 }
2727
2728 static void addrconf_rs_timer(unsigned long data)
2729 {
2730         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2731
2732         if (ifp->idev->cnf.forwarding)
2733                 goto out;
2734
2735         if (ifp->idev->if_flags & IF_RA_RCVD) {
2736                 /*
2737                  *      Announcement received after solicitation
2738                  *      was sent
2739                  */
2740                 goto out;
2741         }
2742
2743         spin_lock(&ifp->lock);
2744         if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2745                 /* The wait after the last probe can be shorter */
2746                 addrconf_mod_timer(ifp, AC_RS,
2747                                    (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2748                                    ifp->idev->cnf.rtr_solicit_delay :
2749                                    ifp->idev->cnf.rtr_solicit_interval);
2750                 spin_unlock(&ifp->lock);
2751
2752                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2753         } else {
2754                 spin_unlock(&ifp->lock);
2755                 /*
2756                  * Note: we do not support deprecated "all on-link"
2757                  * assumption any longer.
2758                  */
2759                 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2760                        ifp->idev->dev->name);
2761         }
2762
2763 out:
2764         in6_ifa_put(ifp);
2765 }
2766
2767 /*
2768  *      Duplicate Address Detection
2769  */
2770 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2771 {
2772         unsigned long rand_num;
2773         struct inet6_dev *idev = ifp->idev;
2774
2775         if (ifp->flags & IFA_F_OPTIMISTIC)
2776                 rand_num = 0;
2777         else
2778                 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2779
2780         ifp->probes = idev->cnf.dad_transmits;
2781         addrconf_mod_timer(ifp, AC_DAD, rand_num);
2782 }
2783
2784 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2785 {
2786         struct inet6_dev *idev = ifp->idev;
2787         struct net_device *dev = idev->dev;
2788
2789         addrconf_join_solict(dev, &ifp->addr);
2790
2791         net_srandom(ifp->addr.s6_addr32[3]);
2792
2793         read_lock_bh(&idev->lock);
2794         if (ifp->dead)
2795                 goto out;
2796         spin_lock_bh(&ifp->lock);
2797
2798         if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2799             idev->cnf.accept_dad < 1 ||
2800             !(ifp->flags&IFA_F_TENTATIVE) ||
2801             ifp->flags & IFA_F_NODAD) {
2802                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
2803                 spin_unlock_bh(&ifp->lock);
2804                 read_unlock_bh(&idev->lock);
2805
2806                 addrconf_dad_completed(ifp);
2807                 return;
2808         }
2809
2810         if (!(idev->if_flags & IF_READY)) {
2811                 spin_unlock_bh(&ifp->lock);
2812                 read_unlock_bh(&idev->lock);
2813                 /*
2814                  * If the device is not ready:
2815                  * - keep it tentative if it is a permanent address.
2816                  * - otherwise, kill it.
2817                  */
2818                 in6_ifa_hold(ifp);
2819                 addrconf_dad_stop(ifp, 0);
2820                 return;
2821         }
2822
2823         /*
2824          * Optimistic nodes can start receiving
2825          * Frames right away
2826          */
2827         if(ifp->flags & IFA_F_OPTIMISTIC)
2828                 ip6_ins_rt(ifp->rt);
2829
2830         addrconf_dad_kick(ifp);
2831         spin_unlock_bh(&ifp->lock);
2832 out:
2833         read_unlock_bh(&idev->lock);
2834 }
2835
2836 static void addrconf_dad_timer(unsigned long data)
2837 {
2838         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2839         struct inet6_dev *idev = ifp->idev;
2840         struct in6_addr mcaddr;
2841
2842         read_lock_bh(&idev->lock);
2843         if (idev->dead) {
2844                 read_unlock_bh(&idev->lock);
2845                 goto out;
2846         }
2847         spin_lock_bh(&ifp->lock);
2848         if (ifp->probes == 0) {
2849                 /*
2850                  * DAD was successful
2851                  */
2852
2853                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
2854                 spin_unlock_bh(&ifp->lock);
2855                 read_unlock_bh(&idev->lock);
2856
2857                 addrconf_dad_completed(ifp);
2858
2859                 goto out;
2860         }
2861
2862         ifp->probes--;
2863         addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2864         spin_unlock_bh(&ifp->lock);
2865         read_unlock_bh(&idev->lock);
2866
2867         /* send a neighbour solicitation for our addr */
2868         addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2869         ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
2870 out:
2871         in6_ifa_put(ifp);
2872 }
2873
2874 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2875 {
2876         struct net_device *     dev = ifp->idev->dev;
2877
2878         /*
2879          *      Configure the address for reception. Now it is valid.
2880          */
2881
2882         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2883
2884         /* If added prefix is link local and forwarding is off,
2885            start sending router solicitations.
2886          */
2887
2888         if (ifp->idev->cnf.forwarding == 0 &&
2889             ifp->idev->cnf.rtr_solicits > 0 &&
2890             (dev->flags&IFF_LOOPBACK) == 0 &&
2891             (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2892                 /*
2893                  *      If a host as already performed a random delay
2894                  *      [...] as part of DAD [...] there is no need
2895                  *      to delay again before sending the first RS
2896                  */
2897                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2898
2899                 spin_lock_bh(&ifp->lock);
2900                 ifp->probes = 1;
2901                 ifp->idev->if_flags |= IF_RS_SENT;
2902                 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2903                 spin_unlock_bh(&ifp->lock);
2904         }
2905 }
2906
2907 static void addrconf_dad_run(struct inet6_dev *idev) {
2908         struct inet6_ifaddr *ifp;
2909
2910         read_lock_bh(&idev->lock);
2911         for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2912                 spin_lock_bh(&ifp->lock);
2913                 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2914                         spin_unlock_bh(&ifp->lock);
2915                         continue;
2916                 }
2917                 spin_unlock_bh(&ifp->lock);
2918                 addrconf_dad_kick(ifp);
2919         }
2920         read_unlock_bh(&idev->lock);
2921 }
2922
2923 #ifdef CONFIG_PROC_FS
2924 struct if6_iter_state {
2925         struct seq_net_private p;
2926         int bucket;
2927 };
2928
2929 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2930 {
2931         struct inet6_ifaddr *ifa = NULL;
2932         struct if6_iter_state *state = seq->private;
2933         struct net *net = seq_file_net(seq);
2934
2935         for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2936                 ifa = inet6_addr_lst[state->bucket];
2937
2938                 while (ifa && !net_eq(dev_net(ifa->idev->dev), net))
2939                         ifa = ifa->lst_next;
2940                 if (ifa)
2941                         break;
2942         }
2943         return ifa;
2944 }
2945
2946 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2947 {
2948         struct if6_iter_state *state = seq->private;
2949         struct net *net = seq_file_net(seq);
2950
2951         ifa = ifa->lst_next;
2952 try_again:
2953         if (ifa) {
2954                 if (!net_eq(dev_net(ifa->idev->dev), net)) {
2955                         ifa = ifa->lst_next;
2956                         goto try_again;
2957                 }
2958         }
2959
2960         if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2961                 ifa = inet6_addr_lst[state->bucket];
2962                 goto try_again;
2963         }
2964
2965         return ifa;
2966 }
2967
2968 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2969 {
2970         struct inet6_ifaddr *ifa = if6_get_first(seq);
2971
2972         if (ifa)
2973                 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2974                         --pos;
2975         return pos ? NULL : ifa;
2976 }
2977
2978 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2979         __acquires(addrconf_hash_lock)
2980 {
2981         read_lock_bh(&addrconf_hash_lock);
2982         return if6_get_idx(seq, *pos);
2983 }
2984
2985 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2986 {
2987         struct inet6_ifaddr *ifa;
2988
2989         ifa = if6_get_next(seq, v);
2990         ++*pos;
2991         return ifa;
2992 }
2993
2994 static void if6_seq_stop(struct seq_file *seq, void *v)
2995         __releases(addrconf_hash_lock)
2996 {
2997         read_unlock_bh(&addrconf_hash_lock);
2998 }
2999
3000 static int if6_seq_show(struct seq_file *seq, void *v)
3001 {
3002         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3003         seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3004                    &ifp->addr,
3005                    ifp->idev->dev->ifindex,
3006                    ifp->prefix_len,
3007                    ifp->scope,
3008                    ifp->flags,
3009                    ifp->idev->dev->name);
3010         return 0;
3011 }
3012
3013 static const struct seq_operations if6_seq_ops = {
3014         .start  = if6_seq_start,
3015         .next   = if6_seq_next,
3016         .show   = if6_seq_show,
3017         .stop   = if6_seq_stop,
3018 };
3019
3020 static int if6_seq_open(struct inode *inode, struct file *file)
3021 {
3022         return seq_open_net(inode, file, &if6_seq_ops,
3023                             sizeof(struct if6_iter_state));
3024 }
3025
3026 static const struct file_operations if6_fops = {
3027         .owner          = THIS_MODULE,
3028         .open           = if6_seq_open,
3029         .read           = seq_read,
3030         .llseek         = seq_lseek,
3031         .release        = seq_release_net,
3032 };
3033
3034 static int if6_proc_net_init(struct net *net)
3035 {
3036         if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
3037                 return -ENOMEM;
3038         return 0;
3039 }
3040
3041 static void if6_proc_net_exit(struct net *net)
3042 {
3043        proc_net_remove(net, "if_inet6");
3044 }
3045
3046 static struct pernet_operations if6_proc_net_ops = {
3047        .init = if6_proc_net_init,
3048        .exit = if6_proc_net_exit,
3049 };
3050
3051 int __init if6_proc_init(void)
3052 {
3053         return register_pernet_subsys(&if6_proc_net_ops);
3054 }
3055
3056 void if6_proc_exit(void)
3057 {
3058         unregister_pernet_subsys(&if6_proc_net_ops);
3059 }
3060 #endif  /* CONFIG_PROC_FS */
3061
3062 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3063 /* Check if address is a home address configured on any interface. */
3064 int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr)
3065 {
3066         int ret = 0;
3067         struct inet6_ifaddr * ifp;
3068         u8 hash = ipv6_addr_hash(addr);
3069         read_lock_bh(&addrconf_hash_lock);
3070         for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) {
3071                 if (!net_eq(dev_net(ifp->idev->dev), net))
3072                         continue;
3073                 if (ipv6_addr_equal(&ifp->addr, addr) &&
3074                     (ifp->flags & IFA_F_HOMEADDRESS)) {
3075                         ret = 1;
3076                         break;
3077                 }
3078         }
3079         read_unlock_bh(&addrconf_hash_lock);
3080         return ret;
3081 }
3082 #endif
3083
3084 /*
3085  *      Periodic address status verification
3086  */
3087
3088 static void addrconf_verify(unsigned long foo)
3089 {
3090         struct inet6_ifaddr *ifp;
3091         unsigned long now, next;
3092         int i;
3093
3094         spin_lock_bh(&addrconf_verify_lock);
3095         now = jiffies;
3096         next = now + ADDR_CHECK_FREQUENCY;
3097
3098         del_timer(&addr_chk_timer);
3099
3100         for (i=0; i < IN6_ADDR_HSIZE; i++) {
3101
3102 restart:
3103                 read_lock(&addrconf_hash_lock);
3104                 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
3105                         unsigned long age;
3106 #ifdef CONFIG_IPV6_PRIVACY
3107                         unsigned long regen_advance;
3108 #endif
3109
3110                         if (ifp->flags & IFA_F_PERMANENT)
3111                                 continue;
3112
3113                         spin_lock(&ifp->lock);
3114                         age = (now - ifp->tstamp) / HZ;
3115
3116 #ifdef CONFIG_IPV6_PRIVACY
3117                         regen_advance = ifp->idev->cnf.regen_max_retry *
3118                                         ifp->idev->cnf.dad_transmits *
3119                                         ifp->idev->nd_parms->retrans_time / HZ;
3120 #endif
3121
3122                         if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3123                             age >= ifp->valid_lft) {
3124                                 spin_unlock(&ifp->lock);
3125                                 in6_ifa_hold(ifp);
3126                                 read_unlock(&addrconf_hash_lock);
3127                                 ipv6_del_addr(ifp);
3128                                 goto restart;
3129                         } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3130                                 spin_unlock(&ifp->lock);
3131                                 continue;
3132                         } else if (age >= ifp->prefered_lft) {
3133                                 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3134                                 int deprecate = 0;
3135
3136                                 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3137                                         deprecate = 1;
3138                                         ifp->flags |= IFA_F_DEPRECATED;
3139                                 }
3140
3141                                 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3142                                         next = ifp->tstamp + ifp->valid_lft * HZ;
3143
3144                                 spin_unlock(&ifp->lock);
3145
3146                                 if (deprecate) {
3147                                         in6_ifa_hold(ifp);
3148                                         read_unlock(&addrconf_hash_lock);
3149
3150                                         ipv6_ifa_notify(0, ifp);
3151                                         in6_ifa_put(ifp);
3152                                         goto restart;
3153                                 }
3154 #ifdef CONFIG_IPV6_PRIVACY
3155                         } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3156                                    !(ifp->flags&IFA_F_TENTATIVE)) {
3157                                 if (age >= ifp->prefered_lft - regen_advance) {
3158                                         struct inet6_ifaddr *ifpub = ifp->ifpub;
3159                                         if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3160                                                 next = ifp->tstamp + ifp->prefered_lft * HZ;
3161                                         if (!ifp->regen_count && ifpub) {
3162                                                 ifp->regen_count++;
3163                                                 in6_ifa_hold(ifp);
3164                                                 in6_ifa_hold(ifpub);
3165                                                 spin_unlock(&ifp->lock);
3166                                                 read_unlock(&addrconf_hash_lock);
3167                                                 spin_lock(&ifpub->lock);
3168                                                 ifpub->regen_count = 0;
3169                                                 spin_unlock(&ifpub->lock);
3170                                                 ipv6_create_tempaddr(ifpub, ifp);
3171                                                 in6_ifa_put(ifpub);
3172                                                 in6_ifa_put(ifp);
3173                                                 goto restart;
3174                                         }
3175                                 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3176                                         next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3177                                 spin_unlock(&ifp->lock);
3178 #endif
3179                         } else {
3180                                 /* ifp->prefered_lft <= ifp->valid_lft */
3181                                 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3182                                         next = ifp->tstamp + ifp->prefered_lft * HZ;
3183                                 spin_unlock(&ifp->lock);
3184                         }
3185                 }
3186                 read_unlock(&addrconf_hash_lock);
3187         }
3188
3189         addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
3190         add_timer(&addr_chk_timer);
3191         spin_unlock_bh(&addrconf_verify_lock);
3192 }
3193
3194 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3195 {
3196         struct in6_addr *pfx = NULL;
3197
3198         if (addr)
3199                 pfx = nla_data(addr);
3200
3201         if (local) {
3202                 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3203                         pfx = NULL;
3204                 else
3205                         pfx = nla_data(local);
3206         }
3207
3208         return pfx;
3209 }
3210
3211 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3212         [IFA_ADDRESS]           = { .len = sizeof(struct in6_addr) },
3213         [IFA_LOCAL]             = { .len = sizeof(struct in6_addr) },
3214         [IFA_CACHEINFO]         = { .len = sizeof(struct ifa_cacheinfo) },
3215 };
3216
3217 static int
3218 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3219 {
3220         struct net *net = sock_net(skb->sk);
3221         struct ifaddrmsg *ifm;
3222         struct nlattr *tb[IFA_MAX+1];
3223         struct in6_addr *pfx;
3224         int err;
3225
3226         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3227         if (err < 0)
3228                 return err;
3229
3230         ifm = nlmsg_data(nlh);
3231         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3232         if (pfx == NULL)
3233                 return -EINVAL;
3234
3235         return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3236 }
3237
3238 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3239                              u32 prefered_lft, u32 valid_lft)
3240 {
3241         u32 flags;
3242         clock_t expires;
3243         unsigned long timeout;
3244
3245         if (!valid_lft || (prefered_lft > valid_lft))
3246                 return -EINVAL;
3247
3248         timeout = addrconf_timeout_fixup(valid_lft, HZ);
3249         if (addrconf_finite_timeout(timeout)) {
3250                 expires = jiffies_to_clock_t(timeout * HZ);
3251                 valid_lft = timeout;
3252                 flags = RTF_EXPIRES;
3253         } else {
3254                 expires = 0;
3255                 flags = 0;
3256                 ifa_flags |= IFA_F_PERMANENT;
3257         }
3258
3259         timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3260         if (addrconf_finite_timeout(timeout)) {
3261                 if (timeout == 0)
3262                         ifa_flags |= IFA_F_DEPRECATED;
3263                 prefered_lft = timeout;
3264         }
3265
3266         spin_lock_bh(&ifp->lock);
3267         ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3268         ifp->tstamp = jiffies;
3269         ifp->valid_lft = valid_lft;
3270         ifp->prefered_lft = prefered_lft;
3271
3272         spin_unlock_bh(&ifp->lock);
3273         if (!(ifp->flags&IFA_F_TENTATIVE))
3274                 ipv6_ifa_notify(0, ifp);
3275
3276         addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3277                               expires, flags);
3278         addrconf_verify(0);
3279
3280         return 0;
3281 }
3282