ec7a91d9e86553475555b9df19d22ced2dc5eb31
[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 #include <linux/slab.h>
57 #ifdef CONFIG_SYSCTL
58 #include <linux/sysctl.h>
59 #endif
60 #include <linux/capability.h>
61 #include <linux/delay.h>
62 #include <linux/notifier.h>
63 #include <linux/string.h>
64
65 #include <net/net_namespace.h>
66 #include <net/sock.h>
67 #include <net/snmp.h>
68
69 #include <net/ipv6.h>
70 #include <net/protocol.h>
71 #include <net/ndisc.h>
72 #include <net/ip6_route.h>
73 #include <net/addrconf.h>
74 #include <net/tcp.h>
75 #include <net/ip.h>
76 #include <net/netlink.h>
77 #include <net/pkt_sched.h>
78 #include <linux/if_tunnel.h>
79 #include <linux/rtnetlink.h>
80
81 #ifdef CONFIG_IPV6_PRIVACY
82 #include <linux/random.h>
83 #endif
84
85 #include <linux/uaccess.h>
86 #include <asm/unaligned.h>
87
88 #include <linux/proc_fs.h>
89 #include <linux/seq_file.h>
90
91 /* Set to 3 to get tracing... */
92 #define ACONF_DEBUG 2
93
94 #if ACONF_DEBUG >= 3
95 #define ADBG(x) printk x
96 #else
97 #define ADBG(x)
98 #endif
99
100 #define INFINITY_LIFE_TIME      0xFFFFFFFF
101 #define TIME_DELTA(a, b) ((unsigned long)((long)(a) - (long)(b)))
102
103 #define ADDRCONF_TIMER_FUZZ_MINUS       (HZ > 50 ? HZ/50 : 1)
104 #define ADDRCONF_TIMER_FUZZ             (HZ / 4)
105 #define ADDRCONF_TIMER_FUZZ_MAX         (HZ)
106
107 #ifdef CONFIG_SYSCTL
108 static void addrconf_sysctl_register(struct inet6_dev *idev);
109 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
110 #else
111 static inline void addrconf_sysctl_register(struct inet6_dev *idev)
112 {
113 }
114
115 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
116 {
117 }
118 #endif
119
120 #ifdef CONFIG_IPV6_PRIVACY
121 static int __ipv6_regen_rndid(struct inet6_dev *idev);
122 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
123 static void ipv6_regen_rndid(unsigned long data);
124 #endif
125
126 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
127 static int ipv6_count_addresses(struct inet6_dev *idev);
128
129 /*
130  *      Configured unicast address hash table
131  */
132 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
133 static DEFINE_SPINLOCK(addrconf_hash_lock);
134
135 static void addrconf_verify(unsigned long);
136
137 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
138 static DEFINE_SPINLOCK(addrconf_verify_lock);
139
140 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
141 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
142
143 static void addrconf_type_change(struct net_device *dev,
144                                  unsigned long event);
145 static int addrconf_ifdown(struct net_device *dev, int how);
146
147 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
148 static void addrconf_dad_timer(unsigned long data);
149 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
150 static void addrconf_dad_run(struct inet6_dev *idev);
151 static void addrconf_rs_timer(unsigned long data);
152 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
153 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
154
155 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
156                                 struct prefix_info *pinfo);
157 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
158                                struct net_device *dev);
159
160 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
161
162 static struct ipv6_devconf ipv6_devconf __read_mostly = {
163         .forwarding             = 0,
164         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
165         .mtu6                   = IPV6_MIN_MTU,
166         .accept_ra              = 1,
167         .accept_redirects       = 1,
168         .autoconf               = 1,
169         .force_mld_version      = 0,
170         .dad_transmits          = 1,
171         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
172         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
173         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
174 #ifdef CONFIG_IPV6_PRIVACY
175         .use_tempaddr           = 0,
176         .temp_valid_lft         = TEMP_VALID_LIFETIME,
177         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
178         .regen_max_retry        = REGEN_MAX_RETRY,
179         .max_desync_factor      = MAX_DESYNC_FACTOR,
180 #endif
181         .max_addresses          = IPV6_MAX_ADDRESSES,
182         .accept_ra_defrtr       = 1,
183         .accept_ra_pinfo        = 1,
184 #ifdef CONFIG_IPV6_ROUTER_PREF
185         .accept_ra_rtr_pref     = 1,
186         .rtr_probe_interval     = 60 * HZ,
187 #ifdef CONFIG_IPV6_ROUTE_INFO
188         .accept_ra_rt_info_max_plen = 0,
189 #endif
190 #endif
191         .proxy_ndp              = 0,
192         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
193         .disable_ipv6           = 0,
194         .accept_dad             = 1,
195 };
196
197 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
198         .forwarding             = 0,
199         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
200         .mtu6                   = IPV6_MIN_MTU,
201         .accept_ra              = 1,
202         .accept_redirects       = 1,
203         .autoconf               = 1,
204         .dad_transmits          = 1,
205         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
206         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
207         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
208 #ifdef CONFIG_IPV6_PRIVACY
209         .use_tempaddr           = 0,
210         .temp_valid_lft         = TEMP_VALID_LIFETIME,
211         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
212         .regen_max_retry        = REGEN_MAX_RETRY,
213         .max_desync_factor      = MAX_DESYNC_FACTOR,
214 #endif
215         .max_addresses          = IPV6_MAX_ADDRESSES,
216         .accept_ra_defrtr       = 1,
217         .accept_ra_pinfo        = 1,
218 #ifdef CONFIG_IPV6_ROUTER_PREF
219         .accept_ra_rtr_pref     = 1,
220         .rtr_probe_interval     = 60 * HZ,
221 #ifdef CONFIG_IPV6_ROUTE_INFO
222         .accept_ra_rt_info_max_plen = 0,
223 #endif
224 #endif
225         .proxy_ndp              = 0,
226         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
227         .disable_ipv6           = 0,
228         .accept_dad             = 1,
229 };
230
231 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
232 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
233 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
234 const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
235 const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
236
237 /* Check if a valid qdisc is available */
238 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
239 {
240         return !qdisc_tx_is_noop(dev);
241 }
242
243 /* Check if a route is valid prefix route */
244 static inline int addrconf_is_prefix_route(const struct rt6_info *rt)
245 {
246         return (rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0;
247 }
248
249 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
250 {
251         if (del_timer(&ifp->timer))
252                 __in6_ifa_put(ifp);
253 }
254
255 enum addrconf_timer_t {
256         AC_NONE,
257         AC_DAD,
258         AC_RS,
259 };
260
261 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
262                                enum addrconf_timer_t what,
263                                unsigned long when)
264 {
265         if (!del_timer(&ifp->timer))
266                 in6_ifa_hold(ifp);
267
268         switch (what) {
269         case AC_DAD:
270                 ifp->timer.function = addrconf_dad_timer;
271                 break;
272         case AC_RS:
273                 ifp->timer.function = addrconf_rs_timer;
274                 break;
275         default:
276                 break;
277         }
278         ifp->timer.expires = jiffies + when;
279         add_timer(&ifp->timer);
280 }
281
282 static int snmp6_alloc_dev(struct inet6_dev *idev)
283 {
284         if (snmp_mib_init((void __percpu **)idev->stats.ipv6,
285                           sizeof(struct ipstats_mib),
286                           __alignof__(struct ipstats_mib)) < 0)
287                 goto err_ip;
288         if (snmp_mib_init((void __percpu **)idev->stats.icmpv6,
289                           sizeof(struct icmpv6_mib),
290                           __alignof__(struct icmpv6_mib)) < 0)
291                 goto err_icmp;
292         if (snmp_mib_init((void __percpu **)idev->stats.icmpv6msg,
293                           sizeof(struct icmpv6msg_mib),
294                           __alignof__(struct icmpv6msg_mib)) < 0)
295                 goto err_icmpmsg;
296
297         return 0;
298
299 err_icmpmsg:
300         snmp_mib_free((void __percpu **)idev->stats.icmpv6);
301 err_icmp:
302         snmp_mib_free((void __percpu **)idev->stats.ipv6);
303 err_ip:
304         return -ENOMEM;
305 }
306
307 static void snmp6_free_dev(struct inet6_dev *idev)
308 {
309         snmp_mib_free((void __percpu **)idev->stats.icmpv6msg);
310         snmp_mib_free((void __percpu **)idev->stats.icmpv6);
311         snmp_mib_free((void __percpu **)idev->stats.ipv6);
312 }
313
314 /* Nobody refers to this device, we may destroy it. */
315
316 static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
317 {
318         struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
319         kfree(idev);
320 }
321
322 void in6_dev_finish_destroy(struct inet6_dev *idev)
323 {
324         struct net_device *dev = idev->dev;
325
326         WARN_ON(!list_empty(&idev->addr_list));
327         WARN_ON(idev->mc_list != NULL);
328
329 #ifdef NET_REFCNT_DEBUG
330         printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
331 #endif
332         dev_put(dev);
333         if (!idev->dead) {
334                 pr_warning("Freeing alive inet6 device %p\n", idev);
335                 return;
336         }
337         snmp6_free_dev(idev);
338         call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
339 }
340
341 EXPORT_SYMBOL(in6_dev_finish_destroy);
342
343 static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
344 {
345         struct inet6_dev *ndev;
346
347         ASSERT_RTNL();
348
349         if (dev->mtu < IPV6_MIN_MTU)
350                 return NULL;
351
352         ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
353
354         if (ndev == NULL)
355                 return NULL;
356
357         rwlock_init(&ndev->lock);
358         ndev->dev = dev;
359         INIT_LIST_HEAD(&ndev->addr_list);
360
361         memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
362         ndev->cnf.mtu6 = dev->mtu;
363         ndev->cnf.sysctl = NULL;
364         ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
365         if (ndev->nd_parms == NULL) {
366                 kfree(ndev);
367                 return NULL;
368         }
369         if (ndev->cnf.forwarding)
370                 dev_disable_lro(dev);
371         /* We refer to the device */
372         dev_hold(dev);
373
374         if (snmp6_alloc_dev(ndev) < 0) {
375                 ADBG((KERN_WARNING
376                         "%s(): cannot allocate memory for statistics; dev=%s.\n",
377                         __func__, dev->name));
378                 neigh_parms_release(&nd_tbl, ndev->nd_parms);
379                 ndev->dead = 1;
380                 in6_dev_finish_destroy(ndev);
381                 return NULL;
382         }
383
384         if (snmp6_register_dev(ndev) < 0) {
385                 ADBG((KERN_WARNING
386                         "%s(): cannot create /proc/net/dev_snmp6/%s\n",
387                         __func__, dev->name));
388                 neigh_parms_release(&nd_tbl, ndev->nd_parms);
389                 ndev->dead = 1;
390                 in6_dev_finish_destroy(ndev);
391                 return NULL;
392         }
393
394         /* One reference from device.  We must do this before
395          * we invoke __ipv6_regen_rndid().
396          */
397         in6_dev_hold(ndev);
398
399         if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
400                 ndev->cnf.accept_dad = -1;
401
402 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
403         if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
404                 printk(KERN_INFO
405                        "%s: Disabled Multicast RS\n",
406                        dev->name);
407                 ndev->cnf.rtr_solicits = 0;
408         }
409 #endif
410
411 #ifdef CONFIG_IPV6_PRIVACY
412         INIT_LIST_HEAD(&ndev->tempaddr_list);
413         setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
414         if ((dev->flags&IFF_LOOPBACK) ||
415             dev->type == ARPHRD_TUNNEL ||
416             dev->type == ARPHRD_TUNNEL6 ||
417             dev->type == ARPHRD_SIT ||
418             dev->type == ARPHRD_NONE) {
419                 printk(KERN_INFO
420                        "%s: Disabled Privacy Extensions\n",
421                        dev->name);
422                 ndev->cnf.use_tempaddr = -1;
423         } else {
424                 in6_dev_hold(ndev);
425                 ipv6_regen_rndid((unsigned long) ndev);
426         }
427 #endif
428
429         if (netif_running(dev) && addrconf_qdisc_ok(dev))
430                 ndev->if_flags |= IF_READY;
431
432         ipv6_mc_init_dev(ndev);
433         ndev->tstamp = jiffies;
434         addrconf_sysctl_register(ndev);
435         /* protected by rtnl_lock */
436         rcu_assign_pointer(dev->ip6_ptr, ndev);
437
438         /* Join all-node multicast group */
439         ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
440
441         return ndev;
442 }
443
444 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
445 {
446         struct inet6_dev *idev;
447
448         ASSERT_RTNL();
449
450         idev = __in6_dev_get(dev);
451         if (!idev) {
452                 idev = ipv6_add_dev(dev);
453                 if (!idev)
454                         return NULL;
455         }
456
457         if (dev->flags&IFF_UP)
458                 ipv6_mc_up(idev);
459         return idev;
460 }
461
462 #ifdef CONFIG_SYSCTL
463 static void dev_forward_change(struct inet6_dev *idev)
464 {
465         struct net_device *dev;
466         struct inet6_ifaddr *ifa;
467
468         if (!idev)
469                 return;
470         dev = idev->dev;
471         if (idev->cnf.forwarding)
472                 dev_disable_lro(dev);
473         if (dev && (dev->flags & IFF_MULTICAST)) {
474                 if (idev->cnf.forwarding)
475                         ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
476                 else
477                         ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
478         }
479
480         list_for_each_entry(ifa, &idev->addr_list, if_list) {
481                 if (ifa->flags&IFA_F_TENTATIVE)
482                         continue;
483                 if (idev->cnf.forwarding)
484                         addrconf_join_anycast(ifa);
485                 else
486                         addrconf_leave_anycast(ifa);
487         }
488 }
489
490
491 static void addrconf_forward_change(struct net *net, __s32 newf)
492 {
493         struct net_device *dev;
494         struct inet6_dev *idev;
495
496         rcu_read_lock();
497         for_each_netdev_rcu(net, dev) {
498                 idev = __in6_dev_get(dev);
499                 if (idev) {
500                         int changed = (!idev->cnf.forwarding) ^ (!newf);
501                         idev->cnf.forwarding = newf;
502                         if (changed)
503                                 dev_forward_change(idev);
504                 }
505         }
506         rcu_read_unlock();
507 }
508
509 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old)
510 {
511         struct net *net;
512
513         net = (struct net *)table->extra2;
514         if (p == &net->ipv6.devconf_dflt->forwarding)
515                 return 0;
516
517         if (!rtnl_trylock()) {
518                 /* Restore the original values before restarting */
519                 *p = old;
520                 return restart_syscall();
521         }
522
523         if (p == &net->ipv6.devconf_all->forwarding) {
524                 __s32 newf = net->ipv6.devconf_all->forwarding;
525                 net->ipv6.devconf_dflt->forwarding = newf;
526                 addrconf_forward_change(net, newf);
527         } else if ((!*p) ^ (!old))
528                 dev_forward_change((struct inet6_dev *)table->extra1);
529         rtnl_unlock();
530
531         if (*p)
532                 rt6_purge_dflt_routers(net);
533         return 1;
534 }
535 #endif
536
537 static void inet6_ifa_finish_destroy_rcu(struct rcu_head *head)
538 {
539         struct inet6_ifaddr *ifp = container_of(head, struct inet6_ifaddr, rcu);
540         kfree(ifp);
541 }
542
543 /* Nobody refers to this ifaddr, destroy it */
544 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
545 {
546         WARN_ON(!hlist_unhashed(&ifp->addr_lst));
547
548 #ifdef NET_REFCNT_DEBUG
549         printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
550 #endif
551
552         in6_dev_put(ifp->idev);
553
554         if (del_timer(&ifp->timer))
555                 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp);
556
557         if (ifp->state != INET6_IFADDR_STATE_DEAD) {
558                 pr_warning("Freeing alive inet6 address %p\n", ifp);
559                 return;
560         }
561         dst_release(&ifp->rt->dst);
562
563         call_rcu(&ifp->rcu, inet6_ifa_finish_destroy_rcu);
564 }
565
566 static void
567 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
568 {
569         struct list_head *p;
570         int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
571
572         /*
573          * Each device address list is sorted in order of scope -
574          * global before linklocal.
575          */
576         list_for_each(p, &idev->addr_list) {
577                 struct inet6_ifaddr *ifa
578                         = list_entry(p, struct inet6_ifaddr, if_list);
579                 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
580                         break;
581         }
582
583         list_add_tail(&ifp->if_list, p);
584 }
585
586 static u32 ipv6_addr_hash(const struct in6_addr *addr)
587 {
588         /*
589          * We perform the hash function over the last 64 bits of the address
590          * This will include the IEEE address token on links that support it.
591          */
592         return jhash_2words((__force u32)addr->s6_addr32[2],
593                             (__force u32)addr->s6_addr32[3], 0)
594                 & (IN6_ADDR_HSIZE - 1);
595 }
596
597 /* On success it returns ifp with increased reference count */
598
599 static struct inet6_ifaddr *
600 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
601               int scope, u32 flags)
602 {
603         struct inet6_ifaddr *ifa = NULL;
604         struct rt6_info *rt;
605         unsigned int hash;
606         int err = 0;
607         int addr_type = ipv6_addr_type(addr);
608
609         if (addr_type == IPV6_ADDR_ANY ||
610             addr_type & IPV6_ADDR_MULTICAST ||
611             (!(idev->dev->flags & IFF_LOOPBACK) &&
612              addr_type & IPV6_ADDR_LOOPBACK))
613                 return ERR_PTR(-EADDRNOTAVAIL);
614
615         rcu_read_lock_bh();
616         if (idev->dead) {
617                 err = -ENODEV;                  /*XXX*/
618                 goto out2;
619         }
620
621         if (idev->cnf.disable_ipv6) {
622                 err = -EACCES;
623                 goto out2;
624         }
625
626         spin_lock(&addrconf_hash_lock);
627
628         /* Ignore adding duplicate addresses on an interface */
629         if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
630                 ADBG(("ipv6_add_addr: already assigned\n"));
631                 err = -EEXIST;
632                 goto out;
633         }
634
635         ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
636
637         if (ifa == NULL) {
638                 ADBG(("ipv6_add_addr: malloc failed\n"));
639                 err = -ENOBUFS;
640                 goto out;
641         }
642
643         rt = addrconf_dst_alloc(idev, addr, 0);
644         if (IS_ERR(rt)) {
645                 err = PTR_ERR(rt);
646                 goto out;
647         }
648
649         ipv6_addr_copy(&ifa->addr, addr);
650
651         spin_lock_init(&ifa->lock);
652         spin_lock_init(&ifa->state_lock);
653         init_timer(&ifa->timer);
654         INIT_HLIST_NODE(&ifa->addr_lst);
655         ifa->timer.data = (unsigned long) ifa;
656         ifa->scope = scope;
657         ifa->prefix_len = pfxlen;
658         ifa->flags = flags | IFA_F_TENTATIVE;
659         ifa->cstamp = ifa->tstamp = jiffies;
660
661         ifa->rt = rt;
662
663         /*
664          * part one of RFC 4429, section 3.3
665          * We should not configure an address as
666          * optimistic if we do not yet know the link
667          * layer address of our nexhop router
668          */
669
670         if (rt->rt6i_nexthop == NULL)
671                 ifa->flags &= ~IFA_F_OPTIMISTIC;
672
673         ifa->idev = idev;
674         in6_dev_hold(idev);
675         /* For caller */
676         in6_ifa_hold(ifa);
677
678         /* Add to big hash table */
679         hash = ipv6_addr_hash(addr);
680
681         hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
682         spin_unlock(&addrconf_hash_lock);
683
684         write_lock(&idev->lock);
685         /* Add to inet6_dev unicast addr list. */
686         ipv6_link_dev_addr(idev, ifa);
687
688 #ifdef CONFIG_IPV6_PRIVACY
689         if (ifa->flags&IFA_F_TEMPORARY) {
690                 list_add(&ifa->tmp_list, &idev->tempaddr_list);
691                 in6_ifa_hold(ifa);
692         }
693 #endif
694
695         in6_ifa_hold(ifa);
696         write_unlock(&idev->lock);
697 out2:
698         rcu_read_unlock_bh();
699
700         if (likely(err == 0))
701                 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
702         else {
703                 kfree(ifa);
704                 ifa = ERR_PTR(err);
705         }
706
707         return ifa;
708 out:
709         spin_unlock(&addrconf_hash_lock);
710         goto out2;
711 }
712
713 /* This function wants to get referenced ifp and releases it before return */
714
715 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
716 {
717         struct inet6_ifaddr *ifa, *ifn;
718         struct inet6_dev *idev = ifp->idev;
719         int state;
720         int hash;
721         int deleted = 0, onlink = 0;
722         unsigned long expires = jiffies;
723
724         hash = ipv6_addr_hash(&ifp->addr);
725
726         spin_lock_bh(&ifp->state_lock);
727         state = ifp->state;
728         ifp->state = INET6_IFADDR_STATE_DEAD;
729         spin_unlock_bh(&ifp->state_lock);
730
731         if (state == INET6_IFADDR_STATE_DEAD)
732                 goto out;
733
734         spin_lock_bh(&addrconf_hash_lock);
735         hlist_del_init_rcu(&ifp->addr_lst);
736         spin_unlock_bh(&addrconf_hash_lock);
737
738         write_lock_bh(&idev->lock);
739 #ifdef CONFIG_IPV6_PRIVACY
740         if (ifp->flags&IFA_F_TEMPORARY) {
741                 list_del(&ifp->tmp_list);
742                 if (ifp->ifpub) {
743                         in6_ifa_put(ifp->ifpub);
744                         ifp->ifpub = NULL;
745                 }
746                 __in6_ifa_put(ifp);
747         }
748 #endif
749
750         list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) {
751                 if (ifa == ifp) {
752                         list_del_init(&ifp->if_list);
753                         __in6_ifa_put(ifp);
754
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         }
788         write_unlock_bh(&idev->lock);
789
790         addrconf_del_timer(ifp);
791
792         ipv6_ifa_notify(RTM_DELADDR, ifp);
793
794         atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
795
796         /*
797          * Purge or update corresponding prefix
798          *
799          * 1) we don't purge prefix here if address was not permanent.
800          *    prefix is managed by its own lifetime.
801          * 2) if there're no addresses, delete prefix.
802          * 3) if there're still other permanent address(es),
803          *    corresponding prefix is still permanent.
804          * 4) otherwise, update prefix lifetime to the
805          *    longest valid lifetime among the corresponding
806          *    addresses on the device.
807          *    Note: subsequent RA will update lifetime.
808          *
809          * --yoshfuji
810          */
811         if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
812                 struct in6_addr prefix;
813                 struct rt6_info *rt;
814                 struct net *net = dev_net(ifp->idev->dev);
815                 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
816                 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1);
817
818                 if (rt && addrconf_is_prefix_route(rt)) {
819                         if (onlink == 0) {
820                                 ip6_del_rt(rt);
821                                 rt = NULL;
822                         } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
823                                 rt->rt6i_expires = expires;
824                                 rt->rt6i_flags |= RTF_EXPIRES;
825                         }
826                 }
827                 dst_release(&rt->dst);
828         }
829
830 out:
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 -
895                                  idev->cnf.max_desync_factor);
896         tmp_plen = ifp->prefix_len;
897         max_addresses = idev->cnf.max_addresses;
898         tmp_cstamp = ifp->cstamp;
899         tmp_tstamp = ifp->tstamp;
900         spin_unlock_bh(&ifp->lock);
901
902         regen_advance = idev->cnf.regen_max_retry *
903                         idev->cnf.dad_transmits *
904                         idev->nd_parms->retrans_time / HZ;
905         write_unlock(&idev->lock);
906
907         /* A temporary address is created only if this calculated Preferred
908          * Lifetime is greater than REGEN_ADVANCE time units.  In particular,
909          * an implementation must not create a temporary address with a zero
910          * Preferred Lifetime.
911          */
912         if (tmp_prefered_lft <= regen_advance) {
913                 in6_ifa_put(ifp);
914                 in6_dev_put(idev);
915                 ret = -1;
916                 goto out;
917         }
918
919         addr_flags = IFA_F_TEMPORARY;
920         /* set in addrconf_prefix_rcv() */
921         if (ifp->flags & IFA_F_OPTIMISTIC)
922                 addr_flags |= IFA_F_OPTIMISTIC;
923
924         ift = !max_addresses ||
925               ipv6_count_addresses(idev) < max_addresses ?
926                 ipv6_add_addr(idev, &addr, tmp_plen,
927                               ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
928                               addr_flags) : NULL;
929         if (!ift || IS_ERR(ift)) {
930                 in6_ifa_put(ifp);
931                 in6_dev_put(idev);
932                 printk(KERN_INFO
933                         "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
934                 tmpaddr = &addr;
935                 write_lock(&idev->lock);
936                 goto retry;
937         }
938
939         spin_lock_bh(&ift->lock);
940         ift->ifpub = ifp;
941         ift->valid_lft = tmp_valid_lft;
942         ift->prefered_lft = tmp_prefered_lft;
943         ift->cstamp = tmp_cstamp;
944         ift->tstamp = tmp_tstamp;
945         spin_unlock_bh(&ift->lock);
946
947         addrconf_dad_start(ift, 0);
948         in6_ifa_put(ift);
949         in6_dev_put(idev);
950 out:
951         return ret;
952 }
953 #endif
954
955 /*
956  *      Choose an appropriate source address (RFC3484)
957  */
958 enum {
959         IPV6_SADDR_RULE_INIT = 0,
960         IPV6_SADDR_RULE_LOCAL,
961         IPV6_SADDR_RULE_SCOPE,
962         IPV6_SADDR_RULE_PREFERRED,
963 #ifdef CONFIG_IPV6_MIP6
964         IPV6_SADDR_RULE_HOA,
965 #endif
966         IPV6_SADDR_RULE_OIF,
967         IPV6_SADDR_RULE_LABEL,
968 #ifdef CONFIG_IPV6_PRIVACY
969         IPV6_SADDR_RULE_PRIVACY,
970 #endif
971         IPV6_SADDR_RULE_ORCHID,
972         IPV6_SADDR_RULE_PREFIX,
973         IPV6_SADDR_RULE_MAX
974 };
975
976 struct ipv6_saddr_score {
977         int                     rule;
978         int                     addr_type;
979         struct inet6_ifaddr     *ifa;
980         DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
981         int                     scopedist;
982         int                     matchlen;
983 };
984
985 struct ipv6_saddr_dst {
986         const struct in6_addr *addr;
987         int ifindex;
988         int scope;
989         int label;
990         unsigned int prefs;
991 };
992
993 static inline int ipv6_saddr_preferred(int type)
994 {
995         if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
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         rcu_read_lock();
1141
1142         for_each_netdev_rcu(net, dev) {
1143                 struct inet6_dev *idev;
1144
1145                 /* Candidate Source Address (section 4)
1146                  *  - multicast and link-local destination address,
1147                  *    the set of candidate source address MUST only
1148                  *    include addresses assigned to interfaces
1149                  *    belonging to the same link as the outgoing
1150                  *    interface.
1151                  * (- For site-local destination addresses, the
1152                  *    set of candidate source addresses MUST only
1153                  *    include addresses assigned to interfaces
1154                  *    belonging to the same site as the outgoing
1155                  *    interface.)
1156                  */
1157                 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1158                      dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1159                     dst.ifindex && dev->ifindex != dst.ifindex)
1160                         continue;
1161
1162                 idev = __in6_dev_get(dev);
1163                 if (!idev)
1164                         continue;
1165
1166                 read_lock_bh(&idev->lock);
1167                 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1168                         int i;
1169
1170                         /*
1171                          * - Tentative Address (RFC2462 section 5.4)
1172                          *  - A tentative address is not considered
1173                          *    "assigned to an interface" in the traditional
1174                          *    sense, unless it is also flagged as optimistic.
1175                          * - Candidate Source Address (section 4)
1176                          *  - In any case, anycast addresses, multicast
1177                          *    addresses, and the unspecified address MUST
1178                          *    NOT be included in a candidate set.
1179                          */
1180                         if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1181                             (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1182                                 continue;
1183
1184                         score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1185
1186                         if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1187                                      score->addr_type & IPV6_ADDR_MULTICAST)) {
1188                                 LIMIT_NETDEBUG(KERN_DEBUG
1189                                                "ADDRCONF: unspecified / multicast address "
1190                                                "assigned as unicast address on %s",
1191                                                dev->name);
1192                                 continue;
1193                         }
1194
1195                         score->rule = -1;
1196                         bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1197
1198                         for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1199                                 int minihiscore, miniscore;
1200
1201                                 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1202                                 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1203
1204                                 if (minihiscore > miniscore) {
1205                                         if (i == IPV6_SADDR_RULE_SCOPE &&
1206                                             score->scopedist > 0) {
1207                                                 /*
1208                                                  * special case:
1209                                                  * each remaining entry
1210                                                  * has too small (not enough)
1211                                                  * scope, because ifa entries
1212                                                  * are sorted by their scope
1213                                                  * values.
1214                                                  */
1215                                                 goto try_nextdev;
1216                                         }
1217                                         break;
1218                                 } else if (minihiscore < miniscore) {
1219                                         if (hiscore->ifa)
1220                                                 in6_ifa_put(hiscore->ifa);
1221
1222                                         in6_ifa_hold(score->ifa);
1223
1224                                         swap(hiscore, score);
1225
1226                                         /* restore our iterator */
1227                                         score->ifa = hiscore->ifa;
1228
1229                                         break;
1230                                 }
1231                         }
1232                 }
1233 try_nextdev:
1234                 read_unlock_bh(&idev->lock);
1235         }
1236         rcu_read_unlock();
1237
1238         if (!hiscore->ifa)
1239                 return -EADDRNOTAVAIL;
1240
1241         ipv6_addr_copy(saddr, &hiscore->ifa->addr);
1242         in6_ifa_put(hiscore->ifa);
1243         return 0;
1244 }
1245 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1246
1247 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1248                     unsigned char banned_flags)
1249 {
1250         struct inet6_dev *idev;
1251         int err = -EADDRNOTAVAIL;
1252
1253         rcu_read_lock();
1254         idev = __in6_dev_get(dev);
1255         if (idev) {
1256                 struct inet6_ifaddr *ifp;
1257
1258                 read_lock_bh(&idev->lock);
1259                 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1260                         if (ifp->scope == IFA_LINK &&
1261                             !(ifp->flags & banned_flags)) {
1262                                 ipv6_addr_copy(addr, &ifp->addr);
1263                                 err = 0;
1264                                 break;
1265                         }
1266                 }
1267                 read_unlock_bh(&idev->lock);
1268         }
1269         rcu_read_unlock();
1270         return err;
1271 }
1272
1273 static int ipv6_count_addresses(struct inet6_dev *idev)
1274 {
1275         int cnt = 0;
1276         struct inet6_ifaddr *ifp;
1277
1278         read_lock_bh(&idev->lock);
1279         list_for_each_entry(ifp, &idev->addr_list, if_list)
1280                 cnt++;
1281         read_unlock_bh(&idev->lock);
1282         return cnt;
1283 }
1284
1285 int ipv6_chk_addr(struct net *net, struct in6_addr *addr,
1286                   struct net_device *dev, int strict)
1287 {
1288         struct inet6_ifaddr *ifp;
1289         struct hlist_node *node;
1290         unsigned int hash = ipv6_addr_hash(addr);
1291
1292         rcu_read_lock_bh();
1293         hlist_for_each_entry_rcu(ifp, node, &inet6_addr_lst[hash], addr_lst) {
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                     (dev == NULL || ifp->idev->dev == dev ||
1299                      !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1300                         rcu_read_unlock_bh();
1301                         return 1;
1302                 }
1303         }
1304
1305         rcu_read_unlock_bh();
1306         return 0;
1307 }
1308 EXPORT_SYMBOL(ipv6_chk_addr);
1309
1310 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1311                                struct net_device *dev)
1312 {
1313         unsigned int hash = ipv6_addr_hash(addr);
1314         struct inet6_ifaddr *ifp;
1315         struct hlist_node *node;
1316
1317         hlist_for_each_entry(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1318                 if (!net_eq(dev_net(ifp->idev->dev), net))
1319                         continue;
1320                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1321                         if (dev == NULL || ifp->idev->dev == dev)
1322                                 return true;
1323                 }
1324         }
1325         return false;
1326 }
1327
1328 int ipv6_chk_prefix(struct in6_addr *addr, struct net_device *dev)
1329 {
1330         struct inet6_dev *idev;
1331         struct inet6_ifaddr *ifa;
1332         int     onlink;
1333
1334         onlink = 0;
1335         rcu_read_lock();
1336         idev = __in6_dev_get(dev);
1337         if (idev) {
1338                 read_lock_bh(&idev->lock);
1339                 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1340                         onlink = ipv6_prefix_equal(addr, &ifa->addr,
1341                                                    ifa->prefix_len);
1342                         if (onlink)
1343                                 break;
1344                 }
1345                 read_unlock_bh(&idev->lock);
1346         }
1347         rcu_read_unlock();
1348         return onlink;
1349 }
1350
1351 EXPORT_SYMBOL(ipv6_chk_prefix);
1352
1353 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1354                                      struct net_device *dev, int strict)
1355 {
1356         struct inet6_ifaddr *ifp, *result = NULL;
1357         unsigned int hash = ipv6_addr_hash(addr);
1358         struct hlist_node *node;
1359
1360         rcu_read_lock_bh();
1361         hlist_for_each_entry_rcu_bh(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1362                 if (!net_eq(dev_net(ifp->idev->dev), net))
1363                         continue;
1364                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1365                         if (dev == NULL || ifp->idev->dev == dev ||
1366                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1367                                 result = ifp;
1368                                 in6_ifa_hold(ifp);
1369                                 break;
1370                         }
1371                 }
1372         }
1373         rcu_read_unlock_bh();
1374
1375         return result;
1376 }
1377
1378 /* Gets referenced address, destroys ifaddr */
1379
1380 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1381 {
1382         if (ifp->flags&IFA_F_PERMANENT) {
1383                 spin_lock_bh(&ifp->lock);
1384                 addrconf_del_timer(ifp);
1385                 ifp->flags |= IFA_F_TENTATIVE;
1386                 if (dad_failed)
1387                         ifp->flags |= IFA_F_DADFAILED;
1388                 spin_unlock_bh(&ifp->lock);
1389                 if (dad_failed)
1390                         ipv6_ifa_notify(0, ifp);
1391                 in6_ifa_put(ifp);
1392 #ifdef CONFIG_IPV6_PRIVACY
1393         } else if (ifp->flags&IFA_F_TEMPORARY) {
1394                 struct inet6_ifaddr *ifpub;
1395                 spin_lock_bh(&ifp->lock);
1396                 ifpub = ifp->ifpub;
1397                 if (ifpub) {
1398                         in6_ifa_hold(ifpub);
1399                         spin_unlock_bh(&ifp->lock);
1400                         ipv6_create_tempaddr(ifpub, ifp);
1401                         in6_ifa_put(ifpub);
1402                 } else {
1403                         spin_unlock_bh(&ifp->lock);
1404                 }
1405                 ipv6_del_addr(ifp);
1406 #endif
1407         } else
1408                 ipv6_del_addr(ifp);
1409 }
1410
1411 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1412 {
1413         int err = -ENOENT;
1414
1415         spin_lock(&ifp->state_lock);
1416         if (ifp->state == INET6_IFADDR_STATE_DAD) {
1417                 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1418                 err = 0;
1419         }
1420         spin_unlock(&ifp->state_lock);
1421
1422         return err;
1423 }
1424
1425 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1426 {
1427         struct inet6_dev *idev = ifp->idev;
1428
1429         if (addrconf_dad_end(ifp))
1430                 return;
1431
1432         if (net_ratelimit())
1433                 printk(KERN_INFO "%s: IPv6 duplicate address %pI6c detected!\n",
1434                         ifp->idev->dev->name, &ifp->addr);
1435
1436         if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1437                 struct in6_addr addr;
1438
1439                 addr.s6_addr32[0] = htonl(0xfe800000);
1440                 addr.s6_addr32[1] = 0;
1441
1442                 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1443                     ipv6_addr_equal(&ifp->addr, &addr)) {
1444                         /* DAD failed for link-local based on MAC address */
1445                         idev->cnf.disable_ipv6 = 1;
1446
1447                         printk(KERN_INFO "%s: IPv6 being disabled!\n",
1448                                 ifp->idev->dev->name);
1449                 }
1450         }
1451
1452         addrconf_dad_stop(ifp, 1);
1453 }
1454
1455 /* Join to solicited addr multicast group. */
1456
1457 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1458 {
1459         struct in6_addr maddr;
1460
1461         if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1462                 return;
1463
1464         addrconf_addr_solict_mult(addr, &maddr);
1465         ipv6_dev_mc_inc(dev, &maddr);
1466 }
1467
1468 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1469 {
1470         struct in6_addr maddr;
1471
1472         if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1473                 return;
1474
1475         addrconf_addr_solict_mult(addr, &maddr);
1476         __ipv6_dev_mc_dec(idev, &maddr);
1477 }
1478
1479 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1480 {
1481         struct in6_addr addr;
1482         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1483         if (ipv6_addr_any(&addr))
1484                 return;
1485         ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1486 }
1487
1488 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1489 {
1490         struct in6_addr addr;
1491         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1492         if (ipv6_addr_any(&addr))
1493                 return;
1494         __ipv6_dev_ac_dec(ifp->idev, &addr);
1495 }
1496
1497 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1498 {
1499         if (dev->addr_len != ETH_ALEN)
1500                 return -1;
1501         memcpy(eui, dev->dev_addr, 3);
1502         memcpy(eui + 5, dev->dev_addr + 3, 3);
1503
1504         /*
1505          * The zSeries OSA network cards can be shared among various
1506          * OS instances, but the OSA cards have only one MAC address.
1507          * This leads to duplicate address conflicts in conjunction
1508          * with IPv6 if more than one instance uses the same card.
1509          *
1510          * The driver for these cards can deliver a unique 16-bit
1511          * identifier for each instance sharing the same card.  It is
1512          * placed instead of 0xFFFE in the interface identifier.  The
1513          * "u" bit of the interface identifier is not inverted in this
1514          * case.  Hence the resulting interface identifier has local
1515          * scope according to RFC2373.
1516          */
1517         if (dev->dev_id) {
1518                 eui[3] = (dev->dev_id >> 8) & 0xFF;
1519                 eui[4] = dev->dev_id & 0xFF;
1520         } else {
1521                 eui[3] = 0xFF;
1522                 eui[4] = 0xFE;
1523                 eui[0] ^= 2;
1524         }
1525         return 0;
1526 }
1527
1528 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1529 {
1530         /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1531         if (dev->addr_len != ARCNET_ALEN)
1532                 return -1;
1533         memset(eui, 0, 7);
1534         eui[7] = *(u8*)dev->dev_addr;
1535         return 0;
1536 }
1537
1538 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1539 {
1540         if (dev->addr_len != INFINIBAND_ALEN)
1541                 return -1;
1542         memcpy(eui, dev->dev_addr + 12, 8);
1543         eui[0] |= 2;
1544         return 0;
1545 }
1546
1547 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1548 {
1549         if (addr == 0)
1550                 return -1;
1551         eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1552                   ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1553                   ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1554                   ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1555                   ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1556                   ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1557         eui[1] = 0;
1558         eui[2] = 0x5E;
1559         eui[3] = 0xFE;
1560         memcpy(eui + 4, &addr, 4);
1561         return 0;
1562 }
1563
1564 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1565 {
1566         if (dev->priv_flags & IFF_ISATAP)
1567                 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1568         return -1;
1569 }
1570
1571 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1572 {
1573         switch (dev->type) {
1574         case ARPHRD_ETHER:
1575         case ARPHRD_FDDI:
1576         case ARPHRD_IEEE802_TR:
1577                 return addrconf_ifid_eui48(eui, dev);
1578         case ARPHRD_ARCNET:
1579                 return addrconf_ifid_arcnet(eui, dev);
1580         case ARPHRD_INFINIBAND:
1581                 return addrconf_ifid_infiniband(eui, dev);
1582         case ARPHRD_SIT:
1583                 return addrconf_ifid_sit(eui, dev);
1584         }
1585         return -1;
1586 }
1587
1588 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1589 {
1590         int err = -1;
1591         struct inet6_ifaddr *ifp;
1592
1593         read_lock_bh(&idev->lock);
1594         list_for_each_entry(ifp, &idev->addr_list, if_list) {
1595                 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1596                         memcpy(eui, ifp->addr.s6_addr+8, 8);
1597                         err = 0;
1598                         break;
1599                 }
1600         }
1601         read_unlock_bh(&idev->lock);
1602         return err;
1603 }
1604
1605 #ifdef CONFIG_IPV6_PRIVACY
1606 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1607 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1608 {
1609 regen:
1610         get_random_bytes(idev->rndid, sizeof(idev->rndid));
1611         idev->rndid[0] &= ~0x02;
1612
1613         /*
1614          * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1615          * check if generated address is not inappropriate
1616          *
1617          *  - Reserved subnet anycast (RFC 2526)
1618          *      11111101 11....11 1xxxxxxx
1619          *  - ISATAP (RFC4214) 6.1
1620          *      00-00-5E-FE-xx-xx-xx-xx
1621          *  - value 0
1622          *  - XXX: already assigned to an address on the device
1623          */
1624         if (idev->rndid[0] == 0xfd &&
1625             (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1626             (idev->rndid[7]&0x80))
1627                 goto regen;
1628         if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1629                 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1630                         goto regen;
1631                 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1632                         goto regen;
1633         }
1634
1635         return 0;
1636 }
1637
1638 static void ipv6_regen_rndid(unsigned long data)
1639 {
1640         struct inet6_dev *idev = (struct inet6_dev *) data;
1641         unsigned long expires;
1642
1643         rcu_read_lock_bh();
1644         write_lock_bh(&idev->lock);
1645
1646         if (idev->dead)
1647                 goto out;
1648
1649         if (__ipv6_regen_rndid(idev) < 0)
1650                 goto out;
1651
1652         expires = jiffies +
1653                 idev->cnf.temp_prefered_lft * HZ -
1654                 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time -
1655                 idev->cnf.max_desync_factor * HZ;
1656         if (time_before(expires, jiffies)) {
1657                 printk(KERN_WARNING
1658                         "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1659                         idev->dev->name);
1660                 goto out;
1661         }
1662
1663         if (!mod_timer(&idev->regen_timer, expires))
1664                 in6_dev_hold(idev);
1665
1666 out:
1667         write_unlock_bh(&idev->lock);
1668         rcu_read_unlock_bh();
1669         in6_dev_put(idev);
1670 }
1671
1672 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1673         int ret = 0;
1674
1675         if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1676                 ret = __ipv6_regen_rndid(idev);
1677         return ret;
1678 }
1679 #endif
1680
1681 /*
1682  *      Add prefix route.
1683  */
1684
1685 static void
1686 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1687                       unsigned long expires, u32 flags)
1688 {
1689         struct fib6_config cfg = {
1690                 .fc_table = RT6_TABLE_PREFIX,
1691                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1692                 .fc_ifindex = dev->ifindex,
1693                 .fc_expires = expires,
1694                 .fc_dst_len = plen,
1695                 .fc_flags = RTF_UP | flags,
1696                 .fc_nlinfo.nl_net = dev_net(dev),
1697                 .fc_protocol = RTPROT_KERNEL,
1698         };
1699
1700         ipv6_addr_copy(&cfg.fc_dst, pfx);
1701
1702         /* Prevent useless cloning on PtP SIT.
1703            This thing is done here expecting that the whole
1704            class of non-broadcast devices need not cloning.
1705          */
1706 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1707         if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1708                 cfg.fc_flags |= RTF_NONEXTHOP;
1709 #endif
1710
1711         ip6_route_add(&cfg);
1712 }
1713
1714 /* Create "default" multicast route to the interface */
1715
1716 static void addrconf_add_mroute(struct net_device *dev)
1717 {
1718         struct fib6_config cfg = {
1719                 .fc_table = RT6_TABLE_LOCAL,
1720                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1721                 .fc_ifindex = dev->ifindex,
1722                 .fc_dst_len = 8,
1723                 .fc_flags = RTF_UP,
1724                 .fc_nlinfo.nl_net = dev_net(dev),
1725         };
1726
1727         ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1728
1729         ip6_route_add(&cfg);
1730 }
1731
1732 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1733 static void sit_route_add(struct net_device *dev)
1734 {
1735         struct fib6_config cfg = {
1736                 .fc_table = RT6_TABLE_MAIN,
1737                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1738                 .fc_ifindex = dev->ifindex,
1739                 .fc_dst_len = 96,
1740                 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1741                 .fc_nlinfo.nl_net = dev_net(dev),
1742         };
1743
1744         /* prefix length - 96 bits "::d.d.d.d" */
1745         ip6_route_add(&cfg);
1746 }
1747 #endif
1748
1749 static void addrconf_add_lroute(struct net_device *dev)
1750 {
1751         struct in6_addr addr;
1752
1753         ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
1754         addrconf_prefix_route(&addr, 64, dev, 0, 0);
1755 }
1756
1757 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1758 {
1759         struct inet6_dev *idev;
1760
1761         ASSERT_RTNL();
1762
1763         idev = ipv6_find_idev(dev);
1764         if (!idev)
1765                 return ERR_PTR(-ENOBUFS);
1766
1767         if (idev->cnf.disable_ipv6)
1768                 return ERR_PTR(-EACCES);
1769
1770         /* Add default multicast route */
1771         addrconf_add_mroute(dev);
1772
1773         /* Add link local route */
1774         addrconf_add_lroute(dev);
1775         return idev;
1776 }
1777
1778 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1779 {
1780         struct prefix_info *pinfo;
1781         __u32 valid_lft;
1782         __u32 prefered_lft;
1783         int addr_type;
1784         struct inet6_dev *in6_dev;
1785         struct net *net = dev_net(dev);
1786
1787         pinfo = (struct prefix_info *) opt;
1788
1789         if (len < sizeof(struct prefix_info)) {
1790                 ADBG(("addrconf: prefix option too short\n"));
1791                 return;
1792         }
1793
1794         /*
1795          *      Validation checks ([ADDRCONF], page 19)
1796          */
1797
1798         addr_type = ipv6_addr_type(&pinfo->prefix);
1799
1800         if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1801                 return;
1802
1803         valid_lft = ntohl(pinfo->valid);
1804         prefered_lft = ntohl(pinfo->prefered);
1805
1806         if (prefered_lft > valid_lft) {
1807                 if (net_ratelimit())
1808                         printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1809                 return;
1810         }
1811
1812         in6_dev = in6_dev_get(dev);
1813
1814         if (in6_dev == NULL) {
1815                 if (net_ratelimit())
1816                         printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1817                 return;
1818         }
1819
1820         /*
1821          *      Two things going on here:
1822          *      1) Add routes for on-link prefixes
1823          *      2) Configure prefixes with the auto flag set
1824          */
1825
1826         if (pinfo->onlink) {
1827                 struct rt6_info *rt;
1828                 unsigned long rt_expires;
1829
1830                 /* Avoid arithmetic overflow. Really, we could
1831                  * save rt_expires in seconds, likely valid_lft,
1832                  * but it would require division in fib gc, that it
1833                  * not good.
1834                  */
1835                 if (HZ > USER_HZ)
1836                         rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
1837                 else
1838                         rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
1839
1840                 if (addrconf_finite_timeout(rt_expires))
1841                         rt_expires *= HZ;
1842
1843                 rt = rt6_lookup(net, &pinfo->prefix, NULL,
1844                                 dev->ifindex, 1);
1845
1846                 if (rt && addrconf_is_prefix_route(rt)) {
1847                         /* Autoconf prefix route */
1848                         if (valid_lft == 0) {
1849                                 ip6_del_rt(rt);
1850                                 rt = NULL;
1851                         } else if (addrconf_finite_timeout(rt_expires)) {
1852                                 /* not infinity */
1853                                 rt->rt6i_expires = jiffies + rt_expires;
1854                                 rt->rt6i_flags |= RTF_EXPIRES;
1855                         } else {
1856                                 rt->rt6i_flags &= ~RTF_EXPIRES;
1857                                 rt->rt6i_expires = 0;
1858                         }
1859                 } else if (valid_lft) {
1860                         clock_t expires = 0;
1861                         int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
1862                         if (addrconf_finite_timeout(rt_expires)) {
1863                                 /* not infinity */
1864                                 flags |= RTF_EXPIRES;
1865                                 expires = jiffies_to_clock_t(rt_expires);
1866                         }
1867                         addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1868                                               dev, expires, flags);
1869                 }
1870                 if (rt)
1871                         dst_release(&rt->dst);
1872         }
1873
1874         /* Try to figure out our local address for this prefix */
1875
1876         if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1877                 struct inet6_ifaddr * ifp;
1878                 struct in6_addr addr;
1879                 int create = 0, update_lft = 0;
1880
1881                 if (pinfo->prefix_len == 64) {
1882                         memcpy(&addr, &pinfo->prefix, 8);
1883                         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1884                             ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1885                                 in6_dev_put(in6_dev);
1886                                 return;
1887                         }
1888                         goto ok;
1889                 }
1890                 if (net_ratelimit())
1891                         printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1892                                pinfo->prefix_len);
1893                 in6_dev_put(in6_dev);
1894                 return;
1895
1896 ok:
1897
1898                 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1899
1900                 if (ifp == NULL && valid_lft) {
1901                         int max_addresses = in6_dev->cnf.max_addresses;
1902                         u32 addr_flags = 0;
1903
1904 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1905                         if (in6_dev->cnf.optimistic_dad &&
1906                             !net->ipv6.devconf_all->forwarding)
1907                                 addr_flags = IFA_F_OPTIMISTIC;
1908 #endif
1909
1910                         /* Do not allow to create too much of autoconfigured
1911                          * addresses; this would be too easy way to crash kernel.
1912                          */
1913                         if (!max_addresses ||
1914                             ipv6_count_addresses(in6_dev) < max_addresses)
1915                                 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1916                                                     addr_type&IPV6_ADDR_SCOPE_MASK,
1917                                                     addr_flags);
1918
1919                         if (!ifp || IS_ERR(ifp)) {
1920                                 in6_dev_put(in6_dev);
1921                                 return;
1922                         }
1923
1924                         update_lft = create = 1;
1925                         ifp->cstamp = jiffies;
1926                         addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1927                 }
1928
1929                 if (ifp) {
1930                         int flags;
1931                         unsigned long now;
1932 #ifdef CONFIG_IPV6_PRIVACY
1933                         struct inet6_ifaddr *ift;
1934 #endif
1935                         u32 stored_lft;
1936
1937                         /* update lifetime (RFC2462 5.5.3 e) */
1938                         spin_lock(&ifp->lock);
1939                         now = jiffies;
1940                         if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1941                                 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1942                         else
1943                                 stored_lft = 0;
1944                         if (!update_lft && stored_lft) {
1945                                 if (valid_lft > MIN_VALID_LIFETIME ||
1946                                     valid_lft > stored_lft)
1947                                         update_lft = 1;
1948                                 else if (stored_lft <= MIN_VALID_LIFETIME) {
1949                                         /* valid_lft <= stored_lft is always true */
1950                                         /*
1951                                          * RFC 4862 Section 5.5.3e:
1952                                          * "Note that the preferred lifetime of
1953                                          *  the corresponding address is always
1954                                          *  reset to the Preferred Lifetime in
1955                                          *  the received Prefix Information
1956                                          *  option, regardless of whether the
1957                                          *  valid lifetime is also reset or
1958                                          *  ignored."
1959                                          *
1960                                          *  So if the preferred lifetime in
1961                                          *  this advertisement is different
1962                                          *  than what we have stored, but the
1963                                          *  valid lifetime is invalid, just
1964                                          *  reset prefered_lft.
1965                                          *
1966                                          *  We must set the valid lifetime
1967                                          *  to the stored lifetime since we'll
1968                                          *  be updating the timestamp below,
1969                                          *  else we'll set it back to the
1970                                          *  minumum.
1971                                          */
1972                                         if (prefered_lft != ifp->prefered_lft) {
1973                                                 valid_lft = stored_lft;
1974                                                 update_lft = 1;
1975                                         }
1976                                 } else {
1977                                         valid_lft = MIN_VALID_LIFETIME;
1978                                         if (valid_lft < prefered_lft)
1979                                                 prefered_lft = valid_lft;
1980                                         update_lft = 1;
1981                                 }
1982                         }
1983
1984                         if (update_lft) {
1985                                 ifp->valid_lft = valid_lft;
1986                                 ifp->prefered_lft = prefered_lft;
1987                                 ifp->tstamp = now;
1988                                 flags = ifp->flags;
1989                                 ifp->flags &= ~IFA_F_DEPRECATED;
1990                                 spin_unlock(&ifp->lock);
1991
1992                                 if (!(flags&IFA_F_TENTATIVE))
1993                                         ipv6_ifa_notify(0, ifp);
1994                         } else
1995                                 spin_unlock(&ifp->lock);
1996
1997 #ifdef CONFIG_IPV6_PRIVACY
1998                         read_lock_bh(&in6_dev->lock);
1999                         /* update all temporary addresses in the list */
2000                         list_for_each_entry(ift, &in6_dev->tempaddr_list, tmp_list) {
2001                                 /*
2002                                  * When adjusting the lifetimes of an existing
2003                                  * temporary address, only lower the lifetimes.
2004                                  * Implementations must not increase the
2005                                  * lifetimes of an existing temporary address
2006                                  * when processing a Prefix Information Option.
2007                                  */
2008                                 if (ifp != ift->ifpub)
2009                                         continue;
2010
2011                                 spin_lock(&ift->lock);
2012                                 flags = ift->flags;
2013                                 if (ift->valid_lft > valid_lft &&
2014                                     ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
2015                                         ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
2016                                 if (ift->prefered_lft > prefered_lft &&
2017                                     ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
2018                                         ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
2019                                 spin_unlock(&ift->lock);
2020                                 if (!(flags&IFA_F_TENTATIVE))
2021                                         ipv6_ifa_notify(0, ift);
2022                         }
2023
2024                         if (create && in6_dev->cnf.use_tempaddr > 0) {
2025                                 /*
2026                                  * When a new public address is created as described in [ADDRCONF],
2027                                  * also create a new temporary address.
2028                                  */
2029                                 read_unlock_bh(&in6_dev->lock);
2030                                 ipv6_create_tempaddr(ifp, NULL);
2031                         } else {
2032                                 read_unlock_bh(&in6_dev->lock);
2033                         }
2034 #endif
2035                         in6_ifa_put(ifp);
2036                         addrconf_verify(0);
2037                 }
2038         }
2039         inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2040         in6_dev_put(in6_dev);
2041 }
2042
2043 /*
2044  *      Set destination address.
2045  *      Special case for SIT interfaces where we create a new "virtual"
2046  *      device.
2047  */
2048 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2049 {
2050         struct in6_ifreq ireq;
2051         struct net_device *dev;
2052         int err = -EINVAL;
2053
2054         rtnl_lock();
2055
2056         err = -EFAULT;
2057         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2058                 goto err_exit;
2059
2060         dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2061
2062         err = -ENODEV;
2063         if (dev == NULL)
2064                 goto err_exit;
2065
2066 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2067         if (dev->type == ARPHRD_SIT) {
2068                 const struct net_device_ops *ops = dev->netdev_ops;
2069                 struct ifreq ifr;
2070                 struct ip_tunnel_parm p;
2071
2072                 err = -EADDRNOTAVAIL;
2073                 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2074                         goto err_exit;
2075
2076                 memset(&p, 0, sizeof(p));
2077                 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2078                 p.iph.saddr = 0;
2079                 p.iph.version = 4;
2080                 p.iph.ihl = 5;
2081                 p.iph.protocol = IPPROTO_IPV6;
2082                 p.iph.ttl = 64;
2083                 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2084
2085                 if (ops->ndo_do_ioctl) {
2086                         mm_segment_t oldfs = get_fs();
2087
2088                         set_fs(KERNEL_DS);
2089                         err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2090                         set_fs(oldfs);
2091                 } else
2092                         err = -EOPNOTSUPP;
2093
2094                 if (err == 0) {
2095                         err = -ENOBUFS;
2096                         dev = __dev_get_by_name(net, p.name);
2097                         if (!dev)
2098                                 goto err_exit;
2099                         err = dev_open(dev);
2100                 }
2101         }
2102 #endif
2103
2104 err_exit:
2105         rtnl_unlock();
2106         return err;
2107 }
2108
2109 /*
2110  *      Manual configuration of address on an interface
2111  */
2112 static int inet6_addr_add(struct net *net, int ifindex, struct in6_addr *pfx,
2113                           unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
2114                           __u32 valid_lft)
2115 {
2116         struct inet6_ifaddr *ifp;
2117         struct inet6_dev *idev;
2118         struct net_device *dev;
2119         int scope;
2120         u32 flags;
2121         clock_t expires;
2122         unsigned long timeout;
2123
2124         ASSERT_RTNL();
2125
2126         if (plen > 128)
2127                 return -EINVAL;
2128
2129         /* check the lifetime */
2130         if (!valid_lft || prefered_lft > valid_lft)
2131                 return -EINVAL;
2132
2133         dev = __dev_get_by_index(net, ifindex);
2134         if (!dev)
2135                 return -ENODEV;
2136
2137         idev = addrconf_add_dev(dev);
2138         if (IS_ERR(idev))
2139                 return PTR_ERR(idev);
2140
2141         scope = ipv6_addr_scope(pfx);
2142
2143         timeout = addrconf_timeout_fixup(valid_lft, HZ);
2144         if (addrconf_finite_timeout(timeout)) {
2145                 expires = jiffies_to_clock_t(timeout * HZ);
2146                 valid_lft = timeout;
2147                 flags = RTF_EXPIRES;
2148         } else {
2149                 expires = 0;
2150                 flags = 0;
2151                 ifa_flags |= IFA_F_PERMANENT;
2152         }
2153
2154         timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2155         if (addrconf_finite_timeout(timeout)) {
2156                 if (timeout == 0)
2157                         ifa_flags |= IFA_F_DEPRECATED;
2158                 prefered_lft = timeout;
2159         }
2160
2161         ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2162
2163         if (!IS_ERR(ifp)) {
2164                 spin_lock_bh(&ifp->lock);
2165                 ifp->valid_lft = valid_lft;
2166                 ifp->prefered_lft = prefered_lft;
2167                 ifp->tstamp = jiffies;
2168                 spin_unlock_bh(&ifp->lock);
2169
2170                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2171                                       expires, flags);
2172                 /*
2173                  * Note that section 3.1 of RFC 4429 indicates
2174                  * that the Optimistic flag should not be set for
2175                  * manually configured addresses
2176                  */
2177                 addrconf_dad_start(ifp, 0);
2178                 in6_ifa_put(ifp);
2179                 addrconf_verify(0);
2180                 return 0;
2181         }
2182
2183         return PTR_ERR(ifp);
2184 }
2185
2186 static int inet6_addr_del(struct net *net, int ifindex, struct in6_addr *pfx,
2187                           unsigned int plen)
2188 {
2189         struct inet6_ifaddr *ifp;
2190         struct inet6_dev *idev;
2191         struct net_device *dev;
2192
2193         if (plen > 128)
2194                 return -EINVAL;
2195
2196         dev = __dev_get_by_index(net, ifindex);
2197         if (!dev)
2198                 return -ENODEV;
2199
2200         if ((idev = __in6_dev_get(dev)) == NULL)
2201                 return -ENXIO;
2202
2203         read_lock_bh(&idev->lock);
2204         list_for_each_entry(ifp, &idev->addr_list, if_list) {
2205                 if (ifp->prefix_len == plen &&
2206                     ipv6_addr_equal(pfx, &ifp->addr)) {
2207                         in6_ifa_hold(ifp);
2208                         read_unlock_bh(&idev->lock);
2209
2210                         ipv6_del_addr(ifp);
2211
2212                         /* If the last address is deleted administratively,
2213                            disable IPv6 on this interface.
2214                          */
2215                         if (list_empty(&idev->addr_list))
2216                                 addrconf_ifdown(idev->dev, 1);
2217                         return 0;
2218                 }
2219         }
2220         read_unlock_bh(&idev->lock);
2221         return -EADDRNOTAVAIL;
2222 }
2223
2224
2225 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2226 {
2227         struct in6_ifreq ireq;
2228         int err;
2229
2230         if (!capable(CAP_NET_ADMIN))
2231                 return -EPERM;
2232
2233         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2234                 return -EFAULT;
2235
2236         rtnl_lock();
2237         err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2238                              ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2239                              INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2240         rtnl_unlock();
2241         return err;
2242 }
2243
2244 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2245 {
2246         struct in6_ifreq ireq;
2247         int err;
2248
2249         if (!capable(CAP_NET_ADMIN))
2250                 return -EPERM;
2251
2252         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2253                 return -EFAULT;
2254
2255         rtnl_lock();
2256         err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2257                              ireq.ifr6_prefixlen);
2258         rtnl_unlock();
2259         return err;
2260 }
2261
2262 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2263                      int plen, int scope)
2264 {
2265         struct inet6_ifaddr *ifp;
2266
2267         ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT);
2268         if (!IS_ERR(ifp)) {
2269                 spin_lock_bh(&ifp->lock);
2270                 ifp->flags &= ~IFA_F_TENTATIVE;
2271                 spin_unlock_bh(&ifp->lock);
2272                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2273                 in6_ifa_put(ifp);
2274         }
2275 }
2276
2277 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2278 static void sit_add_v4_addrs(struct inet6_dev *idev)
2279 {
2280         struct in6_addr addr;
2281         struct net_device *dev;
2282         struct net *net = dev_net(idev->dev);
2283         int scope;
2284
2285         ASSERT_RTNL();
2286
2287         memset(&addr, 0, sizeof(struct in6_addr));
2288         memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2289
2290         if (idev->dev->flags&IFF_POINTOPOINT) {
2291                 addr.s6_addr32[0] = htonl(0xfe800000);
2292                 scope = IFA_LINK;
2293         } else {
2294                 scope = IPV6_ADDR_COMPATv4;
2295         }
2296
2297         if (addr.s6_addr32[3]) {
2298                 add_addr(idev, &addr, 128, scope);
2299                 return;
2300         }
2301
2302         for_each_netdev(net, dev) {
2303                 struct in_device * in_dev = __in_dev_get_rtnl(dev);
2304                 if (in_dev && (dev->flags & IFF_UP)) {
2305                         struct in_ifaddr * ifa;
2306
2307                         int flag = scope;
2308
2309                         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2310                                 int plen;
2311
2312                                 addr.s6_addr32[3] = ifa->ifa_local;
2313
2314                                 if (ifa->ifa_scope == RT_SCOPE_LINK)
2315                                         continue;
2316                                 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2317                                         if (idev->dev->flags&IFF_POINTOPOINT)
2318                                                 continue;
2319                                         flag |= IFA_HOST;
2320                                 }
2321                                 if (idev->dev->flags&IFF_POINTOPOINT)
2322                                         plen = 64;
2323                                 else
2324                                         plen = 96;
2325
2326                                 add_addr(idev, &addr, plen, flag);
2327                         }
2328                 }
2329         }
2330 }
2331 #endif
2332
2333 static void init_loopback(struct net_device *dev)
2334 {
2335         struct inet6_dev  *idev;
2336
2337         /* ::1 */
2338
2339         ASSERT_RTNL();
2340
2341         if ((idev = ipv6_find_idev(dev)) == NULL) {
2342                 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2343                 return;
2344         }
2345
2346         add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2347 }
2348
2349 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2350 {
2351         struct inet6_ifaddr * ifp;
2352         u32 addr_flags = IFA_F_PERMANENT;
2353
2354 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2355         if (idev->cnf.optimistic_dad &&
2356             !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2357                 addr_flags |= IFA_F_OPTIMISTIC;
2358 #endif
2359
2360
2361         ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2362         if (!IS_ERR(ifp)) {
2363                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2364                 addrconf_dad_start(ifp, 0);
2365                 in6_ifa_put(ifp);
2366         }
2367 }
2368
2369 static void addrconf_dev_config(struct net_device *dev)
2370 {
2371         struct in6_addr addr;
2372         struct inet6_dev    * idev;
2373
2374         ASSERT_RTNL();
2375
2376         if ((dev->type != ARPHRD_ETHER) &&
2377             (dev->type != ARPHRD_FDDI) &&
2378             (dev->type != ARPHRD_IEEE802_TR) &&
2379             (dev->type != ARPHRD_ARCNET) &&
2380             (dev->type != ARPHRD_INFINIBAND)) {
2381                 /* Alas, we support only Ethernet autoconfiguration. */
2382                 return;
2383         }
2384
2385         idev = addrconf_add_dev(dev);
2386         if (IS_ERR(idev))
2387                 return;
2388
2389         memset(&addr, 0, sizeof(struct in6_addr));
2390         addr.s6_addr32[0] = htonl(0xFE800000);
2391
2392         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2393                 addrconf_add_linklocal(idev, &addr);
2394 }
2395
2396 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2397 static void addrconf_sit_config(struct net_device *dev)
2398 {
2399         struct inet6_dev *idev;
2400
2401         ASSERT_RTNL();
2402
2403         /*
2404          * Configure the tunnel with one of our IPv4
2405          * addresses... we should configure all of
2406          * our v4 addrs in the tunnel
2407          */
2408
2409         if ((idev = ipv6_find_idev(dev)) == NULL) {
2410                 printk(KERN_DEBUG "init sit: add_dev failed\n");
2411                 return;
2412         }
2413
2414         if (dev->priv_flags & IFF_ISATAP) {
2415                 struct in6_addr addr;
2416
2417                 ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
2418                 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2419                 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2420                         addrconf_add_linklocal(idev, &addr);
2421                 return;
2422         }
2423
2424         sit_add_v4_addrs(idev);
2425
2426         if (dev->flags&IFF_POINTOPOINT) {
2427                 addrconf_add_mroute(dev);
2428                 addrconf_add_lroute(dev);
2429         } else
2430                 sit_route_add(dev);
2431 }
2432 #endif
2433
2434 static inline int
2435 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2436 {
2437         struct in6_addr lladdr;
2438
2439         if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2440                 addrconf_add_linklocal(idev, &lladdr);
2441                 return 0;
2442         }
2443         return -1;
2444 }
2445
2446 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2447 {
2448         struct net_device *link_dev;
2449         struct net *net = dev_net(idev->dev);
2450
2451         /* first try to inherit the link-local address from the link device */
2452         if (idev->dev->iflink &&
2453             (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
2454                 if (!ipv6_inherit_linklocal(idev, link_dev))
2455                         return;
2456         }
2457         /* then try to inherit it from any device */
2458         for_each_netdev(net, link_dev) {
2459                 if (!ipv6_inherit_linklocal(idev, link_dev))
2460                         return;
2461         }
2462         printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2463 }
2464
2465 /*
2466  * Autoconfigure tunnel with a link-local address so routing protocols,
2467  * DHCPv6, MLD etc. can be run over the virtual link
2468  */
2469
2470 static void addrconf_ip6_tnl_config(struct net_device *dev)
2471 {
2472         struct inet6_dev *idev;
2473
2474         ASSERT_RTNL();
2475
2476         idev = addrconf_add_dev(dev);
2477         if (IS_ERR(idev)) {
2478                 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2479                 return;
2480         }
2481         ip6_tnl_add_linklocal(idev);
2482 }
2483
2484 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2485                            void * data)
2486 {
2487         struct net_device *dev = (struct net_device *) data;
2488         struct inet6_dev *idev = __in6_dev_get(dev);
2489         int run_pending = 0;
2490         int err;
2491
2492         switch (event) {
2493         case NETDEV_REGISTER:
2494                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2495                         idev = ipv6_add_dev(dev);
2496                         if (!idev)
2497                                 return notifier_from_errno(-ENOMEM);
2498                 }
2499                 break;
2500
2501         case NETDEV_UP:
2502         case NETDEV_CHANGE:
2503                 if (dev->flags & IFF_SLAVE)
2504                         break;
2505
2506                 if (event == NETDEV_UP) {
2507                         if (!addrconf_qdisc_ok(dev)) {
2508                                 /* device is not ready yet. */
2509                                 printk(KERN_INFO
2510                                         "ADDRCONF(NETDEV_UP): %s: "
2511                                         "link is not ready\n",
2512                                         dev->name);
2513                                 break;
2514                         }
2515
2516                         if (!idev && dev->mtu >= IPV6_MIN_MTU)
2517                                 idev = ipv6_add_dev(dev);
2518
2519                         if (idev) {
2520                                 idev->if_flags |= IF_READY;
2521                                 run_pending = 1;
2522                         }
2523                 } else {
2524                         if (!addrconf_qdisc_ok(dev)) {
2525                                 /* device is still not ready. */
2526                                 break;
2527                         }
2528
2529                         if (idev) {
2530                                 if (idev->if_flags & IF_READY)
2531                                         /* device is already configured. */
2532                                         break;
2533                                 idev->if_flags |= IF_READY;
2534                         }
2535
2536                         printk(KERN_INFO
2537                                         "ADDRCONF(NETDEV_CHANGE): %s: "
2538                                         "link becomes ready\n",
2539                                         dev->name);
2540
2541                         run_pending = 1;
2542                 }
2543
2544                 switch (dev->type) {
2545 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2546                 case ARPHRD_SIT:
2547                         addrconf_sit_config(dev);
2548                         break;
2549 #endif
2550                 case ARPHRD_TUNNEL6:
2551                         addrconf_ip6_tnl_config(dev);
2552                         break;
2553                 case ARPHRD_LOOPBACK:
2554                         init_loopback(dev);
2555                         break;
2556
2557                 default:
2558                         addrconf_dev_config(dev);
2559                         break;
2560                 }
2561
2562                 if (idev) {
2563                         if (run_pending)
2564                                 addrconf_dad_run(idev);
2565
2566                         /*
2567                          * If the MTU changed during the interface down,
2568                          * when the interface up, the changed MTU must be
2569                          * reflected in the idev as well as routers.
2570                          */
2571                         if (idev->cnf.mtu6 != dev->mtu &&
2572                             dev->mtu >= IPV6_MIN_MTU) {
2573                                 rt6_mtu_change(dev, dev->mtu);
2574                                 idev->cnf.mtu6 = dev->mtu;
2575                         }
2576                         idev->tstamp = jiffies;
2577                         inet6_ifinfo_notify(RTM_NEWLINK, idev);
2578
2579                         /*
2580                          * If the changed mtu during down is lower than
2581                          * IPV6_MIN_MTU stop IPv6 on this interface.
2582                          */
2583                         if (dev->mtu < IPV6_MIN_MTU)
2584                                 addrconf_ifdown(dev, 1);
2585                 }
2586                 break;
2587
2588         case NETDEV_CHANGEMTU:
2589                 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2590                         rt6_mtu_change(dev, dev->mtu);
2591                         idev->cnf.mtu6 = dev->mtu;
2592                         break;
2593                 }
2594
2595                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2596                         idev = ipv6_add_dev(dev);
2597                         if (idev)
2598                                 break;
2599                 }
2600
2601                 /*
2602                  * MTU falled under IPV6_MIN_MTU.
2603                  * Stop IPv6 on this interface.
2604                  */
2605
2606         case NETDEV_DOWN:
2607         case NETDEV_UNREGISTER:
2608                 /*
2609                  *      Remove all addresses from this interface.
2610                  */
2611                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2612                 break;
2613
2614         case NETDEV_CHANGENAME:
2615                 if (idev) {
2616                         snmp6_unregister_dev(idev);
2617                         addrconf_sysctl_unregister(idev);
2618                         addrconf_sysctl_register(idev);
2619                         err = snmp6_register_dev(idev);
2620                         if (err)
2621                                 return notifier_from_errno(err);
2622                 }
2623                 break;
2624
2625         case NETDEV_PRE_TYPE_CHANGE:
2626         case NETDEV_POST_TYPE_CHANGE:
2627                 addrconf_type_change(dev, event);
2628                 break;
2629         }
2630
2631         return NOTIFY_OK;
2632 }
2633
2634 /*
2635  *      addrconf module should be notified of a device going up
2636  */
2637 static struct notifier_block ipv6_dev_notf = {
2638         .notifier_call = addrconf_notify,
2639 };
2640
2641 static void addrconf_type_change(struct net_device *dev, unsigned long event)
2642 {
2643         struct inet6_dev *idev;
2644         ASSERT_RTNL();
2645
2646         idev = __in6_dev_get(dev);
2647
2648         if (event == NETDEV_POST_TYPE_CHANGE)
2649                 ipv6_mc_remap(idev);
2650         else if (event == NETDEV_PRE_TYPE_CHANGE)
2651                 ipv6_mc_unmap(idev);
2652 }
2653
2654 static int addrconf_ifdown(struct net_device *dev, int how)
2655 {
2656         struct net *net = dev_net(dev);
2657         struct inet6_dev *idev;
2658         struct inet6_ifaddr *ifa;
2659         LIST_HEAD(keep_list);
2660         int state;
2661
2662         ASSERT_RTNL();
2663
2664         rt6_ifdown(net, dev);
2665         neigh_ifdown(&nd_tbl, dev);
2666
2667         idev = __in6_dev_get(dev);
2668         if (idev == NULL)
2669                 return -ENODEV;
2670
2671         /*
2672          * Step 1: remove reference to ipv6 device from parent device.
2673          *         Do not dev_put!
2674          */
2675         if (how) {
2676                 idev->dead = 1;
2677
2678                 /* protected by rtnl_lock */
2679                 rcu_assign_pointer(dev->ip6_ptr, NULL);
2680
2681                 /* Step 1.5: remove snmp6 entry */
2682                 snmp6_unregister_dev(idev);
2683
2684         }
2685
2686         write_lock_bh(&idev->lock);
2687
2688         /* Step 2: clear flags for stateless addrconf */
2689         if (!how)
2690                 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2691
2692 #ifdef CONFIG_IPV6_PRIVACY
2693         if (how && del_timer(&idev->regen_timer))
2694                 in6_dev_put(idev);
2695
2696         /* Step 3: clear tempaddr list */
2697         while (!list_empty(&idev->tempaddr_list)) {
2698                 ifa = list_first_entry(&idev->tempaddr_list,
2699                                        struct inet6_ifaddr, tmp_list);
2700                 list_del(&ifa->tmp_list);
2701                 write_unlock_bh(&idev->lock);
2702                 spin_lock_bh(&ifa->lock);
2703
2704                 if (ifa->ifpub) {
2705                         in6_ifa_put(ifa->ifpub);
2706                         ifa->ifpub = NULL;
2707                 }
2708                 spin_unlock_bh(&ifa->lock);
2709                 in6_ifa_put(ifa);
2710                 write_lock_bh(&idev->lock);
2711         }
2712 #endif
2713
2714         while (!list_empty(&idev->addr_list)) {
2715                 ifa = list_first_entry(&idev->addr_list,
2716                                        struct inet6_ifaddr, if_list);
2717                 addrconf_del_timer(ifa);
2718
2719                 /* If just doing link down, and address is permanent
2720                    and not link-local, then retain it. */
2721                 if (!how &&
2722                     (ifa->flags&IFA_F_PERMANENT) &&
2723                     !(ipv6_addr_type(&ifa->addr) & IPV6_ADDR_LINKLOCAL)) {
2724                         list_move_tail(&ifa->if_list, &keep_list);
2725
2726                         /* If not doing DAD on this address, just keep it. */
2727                         if ((dev->flags&(IFF_NOARP|IFF_LOOPBACK)) ||
2728                             idev->cnf.accept_dad <= 0 ||
2729                             (ifa->flags & IFA_F_NODAD))
2730                                 continue;
2731
2732                         /* If it was tentative already, no need to notify */
2733                         if (ifa->flags & IFA_F_TENTATIVE)
2734                                 continue;
2735
2736                         /* Flag it for later restoration when link comes up */
2737                         ifa->flags |= IFA_F_TENTATIVE;
2738                         ifa->state = INET6_IFADDR_STATE_DAD;
2739
2740                         write_unlock_bh(&idev->lock);
2741
2742                         in6_ifa_hold(ifa);
2743                 } else {
2744                         list_del(&ifa->if_list);
2745
2746                         /* clear hash table */
2747                         spin_lock_bh(&addrconf_hash_lock);
2748                         hlist_del_init_rcu(&ifa->addr_lst);
2749                         spin_unlock_bh(&addrconf_hash_lock);
2750
2751                         write_unlock_bh(&idev->lock);
2752                         spin_lock_bh(&ifa->state_lock);
2753                         state = ifa->state;
2754                         ifa->state = INET6_IFADDR_STATE_DEAD;
2755                         spin_unlock_bh(&ifa->state_lock);
2756
2757                         if (state == INET6_IFADDR_STATE_DEAD)
2758                                 goto put_ifa;
2759                 }
2760
2761                 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2762                 if (ifa->state == INET6_IFADDR_STATE_DEAD)
2763                         atomic_notifier_call_chain(&inet6addr_chain,
2764                                                    NETDEV_DOWN, ifa);
2765
2766 put_ifa:
2767                 in6_ifa_put(ifa);
2768
2769                 write_lock_bh(&idev->lock);
2770         }
2771
2772         list_splice(&keep_list, &idev->addr_list);
2773
2774         write_unlock_bh(&idev->lock);
2775
2776         /* Step 5: Discard multicast list */
2777         if (how)
2778                 ipv6_mc_destroy_dev(idev);
2779         else
2780                 ipv6_mc_down(idev);
2781
2782         idev->tstamp = jiffies;
2783
2784         /* Last: Shot the device (if unregistered) */
2785         if (how) {
2786                 addrconf_sysctl_unregister(idev);
2787                 neigh_parms_release(&nd_tbl, idev->nd_parms);
2788                 neigh_ifdown(&nd_tbl, dev);
2789                 in6_dev_put(idev);
2790         }
2791         return 0;
2792 }
2793
2794 static void addrconf_rs_timer(unsigned long data)
2795 {
2796         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2797         struct inet6_dev *idev = ifp->idev;
2798
2799         read_lock(&idev->lock);
2800         if (idev->dead || !(idev->if_flags & IF_READY))
2801                 goto out;
2802
2803         if (idev->cnf.forwarding)
2804                 goto out;
2805
2806         /* Announcement received after solicitation was sent */
2807         if (idev->if_flags & IF_RA_RCVD)
2808                 goto out;
2809
2810         spin_lock(&ifp->lock);
2811         if (ifp->probes++ < idev->cnf.rtr_solicits) {
2812                 /* The wait after the last probe can be shorter */
2813                 addrconf_mod_timer(ifp, AC_RS,
2814                                    (ifp->probes == idev->cnf.rtr_solicits) ?
2815                                    idev->cnf.rtr_solicit_delay :
2816                                    idev->cnf.rtr_solicit_interval);
2817                 spin_unlock(&ifp->lock);
2818
2819                 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2820         } else {
2821                 spin_unlock(&ifp->lock);
2822                 /*
2823                  * Note: we do not support deprecated "all on-link"
2824                  * assumption any longer.
2825                  */
2826                 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2827                        idev->dev->name);
2828         }
2829
2830 out:
2831         read_unlock(&idev->lock);
2832         in6_ifa_put(ifp);
2833 }
2834
2835 /*
2836  *      Duplicate Address Detection
2837  */
2838 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2839 {
2840         unsigned long rand_num;
2841         struct inet6_dev *idev = ifp->idev;
2842
2843         if (ifp->flags & IFA_F_OPTIMISTIC)
2844                 rand_num = 0;
2845         else
2846                 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2847
2848         ifp->probes = idev->cnf.dad_transmits;
2849         addrconf_mod_timer(ifp, AC_DAD, rand_num);
2850 }
2851
2852 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2853 {
2854         struct inet6_dev *idev = ifp->idev;
2855         struct net_device *dev = idev->dev;
2856
2857         addrconf_join_solict(dev, &ifp->addr);
2858
2859         net_srandom(ifp->addr.s6_addr32[3]);
2860
2861         read_lock_bh(&idev->lock);
2862         spin_lock(&ifp->lock);
2863         if (ifp->state == INET6_IFADDR_STATE_DEAD)
2864                 goto out;
2865
2866         if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2867             idev->cnf.accept_dad < 1 ||
2868             !(ifp->flags&IFA_F_TENTATIVE) ||
2869             ifp->flags & IFA_F_NODAD) {
2870                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
2871                 spin_unlock(&ifp->lock);
2872                 read_unlock_bh(&idev->lock);
2873
2874                 addrconf_dad_completed(ifp);
2875                 return;
2876         }
2877
2878         if (!(idev->if_flags & IF_READY)) {
2879                 spin_unlock(&ifp->lock);
2880                 read_unlock_bh(&idev->lock);
2881                 /*
2882                  * If the device is not ready:
2883                  * - keep it tentative if it is a permanent address.
2884                  * - otherwise, kill it.
2885                  */
2886                 in6_ifa_hold(ifp);
2887                 addrconf_dad_stop(ifp, 0);
2888                 return;
2889         }
2890
2891         /*
2892          * Optimistic nodes can start receiving
2893          * Frames right away
2894          */
2895         if (ifp->flags & IFA_F_OPTIMISTIC)
2896                 ip6_ins_rt(ifp->rt);
2897
2898         addrconf_dad_kick(ifp);
2899 out:
2900         spin_unlock(&ifp->lock);
2901         read_unlock_bh(&idev->lock);
2902 }
2903
2904 static void addrconf_dad_timer(unsigned long data)
2905 {
2906         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2907         struct inet6_dev *idev = ifp->idev;
2908         struct in6_addr mcaddr;
2909
2910         if (!ifp->probes && addrconf_dad_end(ifp))
2911                 goto out;
2912
2913         read_lock(&idev->lock);
2914         if (idev->dead || !(idev->if_flags & IF_READY)) {
2915                 read_unlock(&idev->lock);
2916                 goto out;
2917         }
2918
2919         spin_lock(&ifp->lock);
2920         if (ifp->state == INET6_IFADDR_STATE_DEAD) {
2921                 spin_unlock(&ifp->lock);
2922                 read_unlock(&idev->lock);
2923                 goto out;
2924         }
2925
2926         if (ifp->probes == 0) {
2927                 /*
2928                  * DAD was successful
2929                  */
2930
2931                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
2932                 spin_unlock(&ifp->lock);
2933                 read_unlock(&idev->lock);
2934
2935                 addrconf_dad_completed(ifp);
2936
2937                 goto out;
2938         }
2939
2940         ifp->probes--;
2941         addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2942         spin_unlock(&ifp->lock);
2943         read_unlock(&idev->lock);
2944
2945         /* send a neighbour solicitation for our addr */
2946         addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2947         ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
2948 out:
2949         in6_ifa_put(ifp);
2950 }
2951
2952 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2953 {
2954         struct net_device *dev = ifp->idev->dev;
2955
2956         /*
2957          *      Configure the address for reception. Now it is valid.
2958          */
2959
2960         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2961
2962         /* If added prefix is link local and forwarding is off,
2963            start sending router solicitations.
2964          */
2965
2966         if ((ifp->idev->cnf.forwarding == 0 ||
2967              ifp->idev->cnf.forwarding == 2) &&
2968             ifp->idev->cnf.rtr_solicits > 0 &&
2969             (dev->flags&IFF_LOOPBACK) == 0 &&
2970             (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2971                 /*
2972                  *      If a host as already performed a random delay
2973                  *      [...] as part of DAD [...] there is no need
2974                  *      to delay again before sending the first RS
2975                  */
2976                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2977
2978                 spin_lock_bh(&ifp->lock);
2979                 ifp->probes = 1;
2980                 ifp->idev->if_flags |= IF_RS_SENT;
2981                 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2982                 spin_unlock_bh(&ifp->lock);
2983         }
2984 }
2985
2986 static void addrconf_dad_run(struct inet6_dev *idev)
2987 {
2988         struct inet6_ifaddr *ifp;
2989
2990         read_lock_bh(&idev->lock);
2991         list_for_each_entry(ifp, &idev->addr_list, if_list) {
2992                 spin_lock(&ifp->lock);
2993                 if (ifp->flags & IFA_F_TENTATIVE &&
2994                     ifp->state == INET6_IFADDR_STATE_DAD)
2995                         addrconf_dad_kick(ifp);
2996                 spin_unlock(&ifp->lock);
2997         }
2998         read_unlock_bh(&idev->lock);
2999 }
3000
3001 #ifdef CONFIG_PROC_FS
3002 struct if6_iter_state {
3003         struct seq_net_private p;
3004         int bucket;
3005 };
3006
3007 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
3008 {
3009         struct inet6_ifaddr *ifa = NULL;
3010         struct if6_iter_state *state = seq->private;
3011         struct net *net = seq_file_net(seq);
3012
3013         for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3014                 struct hlist_node *n;
3015                 hlist_for_each_entry_rcu_bh(ifa, n, &inet6_addr_lst[state->bucket],
3016                                          addr_lst)
3017                         if (net_eq(dev_net(ifa->idev->dev), net))
3018                                 return ifa;
3019         }
3020         return NULL;
3021 }
3022
3023 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3024                                          struct inet6_ifaddr *ifa)
3025 {
3026         struct if6_iter_state *state = seq->private;
3027         struct net *net = seq_file_net(seq);
3028         struct hlist_node *n = &ifa->addr_lst;
3029
3030         hlist_for_each_entry_continue_rcu_bh(ifa, n, addr_lst)
3031                 if (net_eq(dev_net(ifa->idev->dev), net))
3032                         return ifa;
3033
3034         while (++state->bucket < IN6_ADDR_HSIZE) {
3035                 hlist_for_each_entry_rcu_bh(ifa, n,
3036                                      &inet6_addr_lst[state->bucket], addr_lst) {
3037                         if (net_eq(dev_net(ifa->idev->dev), net))
3038                                 return ifa;
3039                 }
3040         }
3041
3042         return NULL;
3043 }
3044
3045 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
3046 {
3047         struct inet6_ifaddr *ifa = if6_get_first(seq);
3048
3049         if (ifa)
3050                 while (pos && (ifa = if6_get_next(seq, ifa)) != NULL)
3051                         --pos;
3052         return pos ? NULL : ifa;
3053 }
3054
3055 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3056         __acquires(rcu_bh)
3057 {
3058         rcu_read_lock_bh();
3059         return if6_get_idx(seq, *pos);
3060 }
3061
3062 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3063 {
3064         struct inet6_ifaddr *ifa;
3065
3066         ifa = if6_get_next(seq, v);
3067         ++*pos;
3068         return ifa;
3069 }
3070
3071 static void if6_seq_stop(struct seq_file *seq, void *v)
3072         __releases(rcu_bh)
3073 {
3074         rcu_read_unlock_bh();
3075 }
3076
3077 static int if6_seq_show(struct seq_file *seq, void *v)
3078 {
3079         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3080         seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3081                    &ifp->addr,
3082                    ifp->idev->dev->ifindex,
3083                    ifp->prefix_len,
3084                    ifp->scope,
3085                    ifp->flags,
3086                    ifp->idev->dev->name);
3087         return 0;
3088 }
3089
3090 static const struct seq_operations if6_seq_ops = {
3091         .start  = if6_seq_start,
3092         .next   = if6_seq_next,
3093         .show   = if6_seq_show,
3094         .stop   = if6_seq_stop,
3095 };
3096
3097 static int if6_seq_open(struct inode *inode, struct file *file)
3098 {
3099         return seq_open_net(inode, file, &if6_seq_ops,
3100                             sizeof(struct if6_iter_state));
3101 }
3102
3103 static const struct file_operations if6_fops = {
3104         .owner          = THIS_MODULE,
3105         .open           = if6_seq_open,
3106         .read           = seq_read,
3107         .llseek         = seq_lseek,
3108         .release        = seq_release_net,
3109 };
3110
3111 static int __net_init if6_proc_net_init(struct net *net)
3112 {
3113         if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
3114                 return -ENOMEM;
3115         return 0;
3116 }
3117
3118 static void __net_exit if6_proc_net_exit(struct net *net)
3119 {
3120        proc_net_remove(net, "if_inet6");
3121 }
3122
3123 static struct pernet_operations if6_proc_net_ops = {
3124        .init = if6_proc_net_init,
3125        .exit = if6_proc_net_exit,
3126 };
3127
3128 int __init if6_proc_init(void)
3129 {
3130         return register_pernet_subsys(&if6_proc_net_ops);
3131 }
3132
3133 void if6_proc_exit(void)
3134 {
3135         unregister_pernet_subsys(&if6_proc_net_ops);
3136 }
3137 #endif  /* CONFIG_PROC_FS */
3138
3139 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3140 /* Check if address is a home address configured on any interface. */
3141 int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr)
3142 {
3143         int ret = 0;
3144         struct inet6_ifaddr *ifp = NULL;
3145         struct hlist_node *n;
3146         unsigned int hash = ipv6_addr_hash(addr);
3147
3148         rcu_read_lock_bh();
3149         hlist_for_each_entry_rcu_bh(ifp, n, &inet6_addr_lst[hash], addr_lst) {
3150                 if (!net_eq(dev_net(ifp->idev->dev), net))
3151                         continue;
3152                 if (ipv6_addr_equal(&ifp->addr, addr) &&
3153                     (ifp->flags & IFA_F_HOMEADDRESS)) {
3154                         ret = 1;
3155                         break;
3156                 }
3157         }
3158         rcu_read_unlock_bh();
3159         return ret;
3160 }
3161 #endif
3162
3163 /*
3164  *      Periodic address status verification
3165  */
3166
3167 static void addrconf_verify(unsigned long foo)
3168 {
3169         unsigned long now, next, next_sec, next_sched;
3170         struct inet6_ifaddr *ifp;
3171         struct hlist_node *node;
3172         int i;
3173
3174         rcu_read_lock_bh();
3175         spin_lock(&addrconf_verify_lock);
3176         now = jiffies;
3177         next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3178
3179         del_timer(&addr_chk_timer);
3180
3181         for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3182 restart:
3183                 hlist_for_each_entry_rcu_bh(ifp, node,
3184                                          &inet6_addr_lst[i], addr_lst) {
3185                         unsigned long age;
3186
3187                         if (ifp->flags & IFA_F_PERMANENT)
3188                                 continue;
3189
3190                         spin_lock(&ifp->lock);
3191                         /* We try to batch several events at once. */
3192                         age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3193
3194                         if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3195                             age >= ifp->valid_lft) {
3196                                 spin_unlock(&ifp->lock);
3197                                 in6_ifa_hold(ifp);
3198                                 ipv6_del_addr(ifp);
3199                                 goto restart;
3200                         } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3201                                 spin_unlock(&ifp->lock);
3202                                 continue;
3203                         } else if (age >= ifp->prefered_lft) {
3204                                 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3205                                 int deprecate = 0;
3206
3207                                 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3208                                         deprecate = 1;
3209                                         ifp->flags |= IFA_F_DEPRECATED;
3210                                 }
3211
3212                                 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3213                                         next = ifp->tstamp + ifp->valid_lft * HZ;
3214
3215                                 spin_unlock(&ifp->lock);
3216
3217                                 if (deprecate) {
3218                                         in6_ifa_hold(ifp);
3219
3220                                         ipv6_ifa_notify(0, ifp);
3221                                         in6_ifa_put(ifp);
3222                                         goto restart;
3223                                 }
3224 #ifdef CONFIG_IPV6_PRIVACY
3225                         } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3226                                    !(ifp->flags&IFA_F_TENTATIVE)) {
3227                                 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3228                                         ifp->idev->cnf.dad_transmits *
3229                                         ifp->idev->nd_parms->retrans_time / HZ;
3230
3231                                 if (age >= ifp->prefered_lft - regen_advance) {
3232                                         struct inet6_ifaddr *ifpub = ifp->ifpub;
3233                                         if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3234                                                 next = ifp->tstamp + ifp->prefered_lft * HZ;
3235                                         if (!ifp->regen_count && ifpub) {
3236                                                 ifp->regen_count++;
3237                                                 in6_ifa_hold(ifp);
3238                                                 in6_ifa_hold(ifpub);
3239                                                 spin_unlock(&ifp->lock);
3240
3241                                                 spin_lock(&ifpub->lock);
3242                                                 ifpub->regen_count = 0;
3243                                                 spin_unlock(&ifpub->lock);
3244                                                 ipv6_create_tempaddr(ifpub, ifp);
3245                                                 in6_ifa_put(ifpub);
3246                                                 in6_ifa_put(ifp);
3247                                                 goto restart;
3248                                         }
3249                                 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3250                                         next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3251                                 spin_unlock(&ifp->lock);
3252 #endif
3253                         } else {
3254                                 /* ifp->prefered_lft <= ifp->valid_lft */
3255                                 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3256                                         next = ifp->tstamp + ifp->prefered_lft * HZ;
3257                                 spin_unlock(&ifp->lock);
3258                         }
3259                 }
3260         }
3261
3262         next_sec = round_jiffies_up(next);
3263         next_sched = next;
3264
3265         /* If rounded timeout is accurate enough, accept it. */
3266         if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3267                 next_sched = next_sec;
3268
3269         /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3270         if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3271                 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3272
3273         ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3274               now, next, next_sec, next_sched));
3275
3276         addr_chk_timer.expires = next_sched;
3277         add_timer(&addr_chk_timer);
3278         spin_unlock(&addrconf_verify_lock);
3279         rcu_read_unlock_bh();
3280 }
3281
3282 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3283 {
3284         struct in6_addr *pfx = NULL;
3285
3286         if (addr)
3287                 pfx = nla_data(addr);
3288
3289         if (local) {
3290                 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3291                         pfx = NULL;
3292                 else
3293                         pfx = nla_data(local);
3294         }
3295
3296         return pfx;
3297 }
3298
3299 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3300         [IFA_ADDRESS]           = { .len = sizeof(struct in6_addr) },
3301         [IFA_LOCAL]             = { .len = sizeof(struct in6_addr) },
3302         [IFA_CACHEINFO]         = { .len = sizeof(struct ifa_cacheinfo) },
3303 };
3304
3305 static int
3306 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3307 {
3308         struct net *net = sock_net(skb->sk);
3309         struct ifaddrmsg *ifm;
3310         struct nlattr *tb[IFA_MAX+1];
3311         struct in6_addr *pfx;
3312         int err;
3313
3314         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3315         if (err < 0)
3316                 return err;
3317
3318         ifm = nlmsg_data(nlh);
3319         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3320         if (pfx == NULL)
3321                 return -EINVAL;
3322
3323         return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3324 }
3325
3326 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3327                              u32 prefered_lft, u32 valid_lft)
3328 {
3329         u32 flags;
3330         clock_t expires;
3331         unsigned long timeout;
3332
3333         if (!valid_lft || (prefered_lft > valid_lft))
3334                 return -EINVAL;
3335
3336         timeout = addrconf_timeout_fixup(valid_lft, HZ);
3337         if (addrconf_finite_timeout(timeout)) {
3338                 expires = jiffies_to_clock_t(timeout * HZ);
3339                 valid_lft = timeout;
3340                 flags = RTF_EXPIRES;
3341         } else {
3342                 expires = 0;
3343                 flags = 0;
3344                 ifa_flags |= IFA_F_PERMANENT;
3345         }
3346
3347         timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3348         if (addrconf_finite_timeout(timeout)) {
3349                 if (timeout == 0)
3350                         ifa_flags |= IFA_F_DEPRECATED;
3351                 prefered_lft = timeout;
3352         }
3353
3354         spin_lock_bh(&ifp->lock);
3355         ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3356         ifp->tstamp = jiffies;
3357         ifp->valid_lft = valid_lft;
3358         ifp->prefered_lft = prefered_lft;
3359
3360         spin_unlock_bh(&ifp->lock);
3361         if (!(ifp->flags&IFA_F_TENTATIVE))
3362                 ipv6_ifa_notify(0, ifp);
3363
3364         addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3365                               expires, flags);
3366         addrconf_verify(0);
3367
3368         return 0;
3369 }
3370
3371 static int
3372 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3373 {
3374         struct net *net = sock_net(skb->sk);
3375         struct ifaddrmsg *ifm;
3376         struct nlattr *tb[IFA_MAX+1];
3377         struct in6_addr *pfx;
3378         struct inet6_ifaddr *ifa;
3379         struct net_device *dev;
3380         u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3381         u8 ifa_flags;
3382         int err;
3383
3384         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3385         if (err < 0)
3386                 return err;
3387
3388         ifm = nlmsg_data(nlh);
3389         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3390         if (pfx == NULL)
3391                 return -EINVAL;
3392
3393         if (tb[IFA_CACHEINFO]) {
3394                 struct ifa_cacheinfo *ci;
3395
3396                 ci = nla_data(tb[IFA_CACHEINFO]);
3397                 valid_lft = ci->ifa_valid;
3398                 preferred_lft = ci->ifa_prefered;
3399         } else {
3400                 preferred_lft = INFINITY_LIFE_TIME;
3401                 valid_lft = INFINITY_LIFE_TIME;
3402         }
3403
3404         dev =  __dev_get_by_index(net, ifm->ifa_index);
3405         if (dev == NULL)
3406                 return -ENODEV;
3407
3408         /* We ignore other flags so far. */
3409         ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3410
3411         ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3412         if (ifa == NULL) {
3413                 /*
3414                  * It would be best to check for !NLM_F_CREATE here but
3415                  * userspace alreay relies on not having to provide this.
3416                  */
3417                 return inet6_addr_add(net, ifm->ifa_index, pfx,
3418                                       ifm->ifa_prefixlen, ifa_flags,
3419                                       preferred_lft, valid_lft);
3420         }
3421
3422         if (nlh->nlmsg_flags & NLM_F_EXCL ||
3423             !(nlh->nlmsg_flags & NLM_F_REPLACE))
3424                 err = -EEXIST;
3425         else
3426                 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3427
3428         in6_ifa_put(ifa);
3429
3430         return err;
3431 }
3432
3433 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3434                           u8 scope, int ifindex)
3435 {
3436         struct ifaddrmsg *ifm;
3437
3438         ifm = nlmsg_data(nlh);
3439         ifm->ifa_family = AF_INET6;
3440         ifm->ifa_prefixlen = prefixlen;
3441         ifm->ifa_flags = flags;
3442         ifm->ifa_scope = scope;
3443         ifm->ifa_index = ifindex;
3444 }
3445
3446 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3447                          unsigned long tstamp, u32 preferred, u32 valid)
3448 {
3449         struct ifa_cacheinfo ci;
3450
3451         ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3452                         + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3453         ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3454                         + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3455         ci.ifa_prefered = preferred;
3456         ci.ifa_valid = valid;
3457
3458         return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3459 }
3460
3461 static inline int rt_scope(int ifa_scope)
3462 {
3463         if (ifa_scope & IFA_HOST)
3464                 return RT_SCOPE_HOST;
3465         else if (ifa_scope & IFA_LINK)
3466                 return RT_SCOPE_LINK;
3467         else if (ifa_scope & IFA_SITE)
3468                 return RT_SCOPE_SITE;
3469         else
3470                 return RT_SCOPE_UNIVERSE;
3471 }
3472
3473 static inline int inet6_ifaddr_msgsize(void)
3474 {
3475         return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3476                + nla_total_size(16) /* IFA_ADDRESS */
3477                + nla_total_size(sizeof(struct ifa_cacheinfo));
3478 }
3479
3480 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3481                              u32 pid, u32 seq, int event, unsigned int flags)
3482 {
3483         struct nlmsghdr  *nlh;
3484         u32 preferred, valid;
3485
3486         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3487         if (nlh == NULL)
3488                 return -EMSGSIZE;
3489
3490         put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3491                       ifa->idev->dev->ifindex);
3492
3493         if (!(ifa->flags&IFA_F_PERMANENT)) {
3494                 preferred = ifa->prefered_lft;
3495                 valid = ifa->valid_lft;
3496                 if (preferred != INFINITY_LIFE_TIME) {
3497                         long tval = (jiffies - ifa->tstamp)/HZ;
3498                         if (preferred > tval)
3499                                 preferred -= tval;
3500                         else
3501                                 preferred = 0;
3502                         if (valid != INFINITY_LIFE_TIME) {
3503                                 if (valid > tval)
3504                                         valid -= tval;
3505                                 else
3506                                         valid = 0;
3507                         }
3508                 }
3509         } else {
3510                 preferred = INFINITY_LIFE_TIME;
3511                 valid = INFINITY_LIFE_TIME;
3512         }
3513
3514         if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3515             put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3516                 nlmsg_cancel(skb, nlh);
3517                 return -EMSGSIZE;
3518         }
3519
3520         return nlmsg_end(skb, nlh);
3521 }
3522
3523 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3524                                 u32 pid, u32 seq, int event, u16 flags)
3525 {
3526         struct nlmsghdr  *nlh;
3527         u8 scope = RT_SCOPE_UNIVERSE;
3528         int ifindex = ifmca->idev->dev->ifindex;
3529
3530         if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3531                 scope = RT_SCOPE_SITE;
3532
3533         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3534         if (nlh == NULL)
3535                 return -EMSGSIZE;
3536
3537         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3538         if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3539             put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3540                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3541                 nlmsg_cancel(skb, nlh);
3542                 return -EMSGSIZE;
3543         }
3544
3545         return nlmsg_end(skb, nlh);
3546 }
3547
3548 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3549                                 u32 pid, u32 seq, int event, unsigned int flags)
3550 {
3551         struct nlmsghdr  *nlh;
3552         u8 scope = RT_SCOPE_UNIVERSE;
3553         int ifindex = ifaca->aca_idev->dev->ifindex;
3554
3555         if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3556                 scope = RT_SCOPE_SITE;
3557
3558         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3559         if (nlh == NULL)
3560                 return -EMSGSIZE;
3561
3562         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3563         if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3564             put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3565                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3566                 nlmsg_cancel(skb, nlh);
3567                 return -EMSGSIZE;
3568         }
3569
3570         return nlmsg_end(skb, nlh);
3571 }
3572
3573 enum addr_type_t {
3574         UNICAST_ADDR,
3575         MULTICAST_ADDR,
3576         ANYCAST_ADDR,
3577 };
3578
3579 /* called with rcu_read_lock() */
3580 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3581                           struct netlink_callback *cb, enum addr_type_t type,
3582                           int s_ip_idx, int *p_ip_idx)
3583 {
3584         struct ifmcaddr6 *ifmca;
3585         struct ifacaddr6 *ifaca;
3586         int err = 1;
3587         int ip_idx = *p_ip_idx;
3588
3589         read_lock_bh(&idev->lock);
3590         switch (type) {
3591         case UNICAST_ADDR: {
3592                 struct inet6_ifaddr *ifa;
3593
3594                 /* unicast address incl. temp addr */
3595                 list_for_each_entry(ifa, &idev->addr_list, if_list) {
3596                         if (++ip_idx < s_ip_idx)
3597                                 continue;
3598                         err = inet6_fill_ifaddr(skb, ifa,
3599                                                 NETLINK_CB(cb->skb).pid,
3600                                                 cb->nlh->nlmsg_seq,
3601                                                 RTM_NEWADDR,
3602                                                 NLM_F_MULTI);
3603                         if (err <= 0)
3604                                 break;
3605                 }
3606                 break;
3607         }
3608         case MULTICAST_ADDR:
3609                 /* multicast address */
3610                 for (ifmca = idev->mc_list; ifmca;
3611                      ifmca = ifmca->next, ip_idx++) {
3612                         if (ip_idx < s_ip_idx)
3613                                 continue;
3614                         err = inet6_fill_ifmcaddr(skb, ifmca,
3615                                                   NETLINK_CB(cb->skb).pid,
3616                                                   cb->nlh->nlmsg_seq,
3617                                                   RTM_GETMULTICAST,
3618                                                   NLM_F_MULTI);
3619                         if (err <= 0)
3620                                 break;
3621                 }
3622                 break;
3623         case ANYCAST_ADDR:
3624                 /* anycast address */
3625                 for (ifaca = idev->ac_list; ifaca;
3626                      ifaca = ifaca->aca_next, ip_idx++) {
3627                         if (ip_idx < s_ip_idx)
3628                                 continue;
3629                         err = inet6_fill_ifacaddr(skb, ifaca,
3630                                                   NETLINK_CB(cb->skb).pid,
3631                                                   cb->nlh->nlmsg_seq,
3632                                                   RTM_GETANYCAST,
3633                                                   NLM_F_MULTI);
3634                         if (err <= 0)
3635                                 break;
3636                 }
3637                 break;
3638         default:
3639                 break;
3640         }
3641         read_unlock_bh(&idev->lock);
3642         *p_ip_idx = ip_idx;
3643         return err;
3644 }
3645
3646 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3647                            enum addr_type_t type)
3648 {
3649         struct net *net = sock_net(skb->sk);
3650         int h, s_h;
3651         int idx, ip_idx;
3652         int s_idx, s_ip_idx;
3653         struct net_device *dev;
3654         struct inet6_dev *idev;
3655         struct hlist_head *head;
3656         struct hlist_node *node;
3657
3658         s_h = cb->args[0];
3659         s_idx = idx = cb->args[1];
3660         s_ip_idx = ip_idx = cb->args[2];
3661
3662         rcu_read_lock();
3663         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3664                 idx = 0;
3665                 head = &net->dev_index_head[h];
3666                 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3667                         if (idx < s_idx)
3668                                 goto cont;
3669                         if (h > s_h || idx > s_idx)
3670                                 s_ip_idx = 0;
3671                         ip_idx = 0;
3672                         idev = __in6_dev_get(dev);
3673                         if (!idev)
3674                                 goto cont;
3675
3676                         if (in6_dump_addrs(idev, skb, cb, type,
3677                                            s_ip_idx, &ip_idx) <= 0)
3678                                 goto done;
3679 cont:
3680                         idx++;
3681                 }
3682         }
3683 done:
3684         rcu_read_unlock();
3685         cb->args[0] = h;
3686         cb->args[1] = idx;
3687         cb->args[2] = ip_idx;
3688
3689         return skb->len;
3690 }
3691
3692 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3693 {
3694         enum addr_type_t type = UNICAST_ADDR;
3695
3696         return inet6_dump_addr(skb, cb, type);
3697 }
3698
3699 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3700 {
3701         enum addr_type_t type = MULTICAST_ADDR;
3702
3703         return inet6_dump_addr(skb, cb, type);
3704 }
3705
3706
3707 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3708 {
3709         enum addr_type_t type = ANYCAST_ADDR;
3710
3711         return inet6_dump_addr(skb, cb, type);
3712 }
3713
3714 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3715                              void *arg)
3716 {
3717         struct net *net = sock_net(in_skb->sk);
3718         struct ifaddrmsg *ifm;
3719         struct nlattr *tb[IFA_MAX+1];
3720         struct in6_addr *addr = NULL;
3721         struct net_device *dev = NULL;
3722         struct inet6_ifaddr *ifa;
3723         struct sk_buff *skb;
3724         int err;
3725
3726         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3727         if (err < 0)
3728                 goto errout;
3729
3730         addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3731         if (addr == NULL) {
3732                 err = -EINVAL;
3733                 goto errout;
3734         }
3735
3736         ifm = nlmsg_data(nlh);
3737         if (ifm->ifa_index)
3738                 dev = __dev_get_by_index(net, ifm->ifa_index);
3739
3740         ifa = ipv6_get_ifaddr(net, addr, dev, 1);
3741         if (!ifa) {
3742                 err = -EADDRNOTAVAIL;
3743                 goto errout;
3744         }
3745
3746         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
3747         if (!skb) {
3748                 err = -ENOBUFS;
3749                 goto errout_ifa;
3750         }
3751
3752         err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3753                                 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3754         if (err < 0) {
3755                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3756                 WARN_ON(err == -EMSGSIZE);
3757                 kfree_skb(skb);
3758                 goto errout_ifa;
3759         }
3760         err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
3761 errout_ifa:
3762         in6_ifa_put(ifa);
3763 errout:
3764         return err;
3765 }
3766
3767 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3768 {
3769         struct sk_buff *skb;
3770         struct net *net = dev_net(ifa->idev->dev);
3771         int err = -ENOBUFS;
3772
3773         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3774         if (skb == NULL)
3775                 goto errout;
3776
3777         err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3778         if (err < 0) {
3779                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3780                 WARN_ON(err == -EMSGSIZE);
3781                 kfree_skb(skb);
3782                 goto errout;
3783         }
3784         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3785         return;
3786 errout:
3787         if (err < 0)
3788                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3789 }
3790
3791 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3792                                 __s32 *array, int bytes)
3793 {
3794         BUG_ON(bytes < (DEVCONF_MAX * 4));
3795
3796         memset(array, 0, bytes);
3797         array[DEVCONF_FORWARDING] = cnf->forwarding;
3798         array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3799         array[DEVCONF_MTU6] = cnf->mtu6;
3800         array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3801         array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3802         array[DEVCONF_AUTOCONF] = cnf->autoconf;
3803         array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3804         array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3805         array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3806         array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3807         array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3808 #ifdef CONFIG_IPV6_PRIVACY
3809         array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3810         array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3811         array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3812         array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3813         array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3814 #endif
3815         array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3816         array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3817         array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3818 #ifdef CONFIG_IPV6_ROUTER_PREF
3819         array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3820         array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
3821 #ifdef CONFIG_IPV6_ROUTE_INFO
3822         array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3823 #endif
3824 #endif
3825         array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3826         array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3827 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3828         array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3829 #endif
3830 #ifdef CONFIG_IPV6_MROUTE
3831         array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
3832 #endif
3833         array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
3834         array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
3835         array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
3836 }
3837
3838 static inline size_t inet6_if_nlmsg_size(void)
3839 {
3840         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3841                + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3842                + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3843                + nla_total_size(4) /* IFLA_MTU */
3844                + nla_total_size(4) /* IFLA_LINK */
3845                + nla_total_size( /* IFLA_PROTINFO */
3846                         nla_total_size(4) /* IFLA_INET6_FLAGS */
3847                         + nla_total_size(sizeof(struct ifla_cacheinfo))
3848                         + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3849                         + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3850                         + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
3851                  );
3852 }
3853
3854 static inline void __snmp6_fill_stats(u64 *stats, void __percpu **mib,
3855                                       int items, int bytes)
3856 {
3857         int i;
3858         int pad = bytes - sizeof(u64) * items;
3859         BUG_ON(pad < 0);
3860
3861         /* Use put_unaligned() because stats may not be aligned for u64. */
3862         put_unaligned(items, &stats[0]);
3863         for (i = 1; i < items; i++)
3864                 put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3865
3866         memset(&stats[items], 0, pad);
3867 }
3868
3869 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib,
3870                                       int items, int bytes, size_t syncpoff)
3871 {
3872         int i;
3873         int pad = bytes - sizeof(u64) * items;
3874         BUG_ON(pad < 0);
3875
3876         /* Use put_unaligned() because stats may not be aligned for u64. */
3877         put_unaligned(items, &stats[0]);
3878         for (i = 1; i < items; i++)
3879                 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
3880
3881         memset(&stats[items], 0, pad);
3882 }
3883
3884 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3885                              int bytes)
3886 {
3887         switch (attrtype) {
3888         case IFLA_INET6_STATS:
3889                 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6,
3890                                      IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
3891                 break;
3892         case IFLA_INET6_ICMP6STATS:
3893                 __snmp6_fill_stats(stats, (void __percpu **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
3894                 break;
3895         }
3896 }
3897
3898 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3899                              u32 pid, u32 seq, int event, unsigned int flags)
3900 {
3901         struct net_device *dev = idev->dev;
3902         struct nlattr *nla;
3903         struct ifinfomsg *hdr;
3904         struct nlmsghdr *nlh;
3905         void *protoinfo;
3906         struct ifla_cacheinfo ci;
3907
3908         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3909         if (nlh == NULL)
3910                 return -EMSGSIZE;
3911
3912         hdr = nlmsg_data(nlh);
3913         hdr->ifi_family = AF_INET6;
3914         hdr->__ifi_pad = 0;
3915         hdr->ifi_type = dev->type;
3916         hdr->ifi_index = dev->ifindex;
3917         hdr->ifi_flags = dev_get_flags(dev);
3918         hdr->ifi_change = 0;
3919
3920         NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
3921
3922         if (dev->addr_len)
3923                 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3924
3925         NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
3926         if (dev->ifindex != dev->iflink)
3927                 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
3928
3929         protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3930         if (protoinfo == NULL)
3931                 goto nla_put_failure;
3932
3933         NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
3934
3935         ci.max_reasm_len = IPV6_MAXPLEN;
3936         ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3937                     + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3938         ci.reachable_time = idev->nd_parms->reachable_time;
3939         ci.retrans_time = idev->nd_parms->retrans_time;
3940         NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3941
3942         nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3943         if (nla == NULL)
3944                 goto nla_put_failure;
3945         ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
3946
3947         /* XXX - MC not implemented */
3948
3949         nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3950         if (nla == NULL)
3951                 goto nla_put_failure;
3952         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3953
3954         nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3955         if (nla == NULL)
3956                 goto nla_put_failure;
3957         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
3958
3959         nla_nest_end(skb, protoinfo);
3960         return nlmsg_end(skb, nlh);
3961
3962 nla_put_failure:
3963         nlmsg_cancel(skb, nlh);
3964         return -EMSGSIZE;
3965 }
3966
3967 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3968 {
3969         struct net *net = sock_net(skb->sk);
3970         int h, s_h;
3971         int idx = 0, s_idx;
3972         struct net_device *dev;
3973         struct inet6_dev *idev;
3974         struct hlist_head *head;
3975         struct hlist_node *node;
3976
3977         s_h = cb->args[0];
3978         s_idx = cb->args[1];
3979
3980         rcu_read_lock();
3981         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3982                 idx = 0;
3983                 head = &net->dev_index_head[h];
3984                 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3985                         if (idx < s_idx)
3986                                 goto cont;
3987                         idev = __in6_dev_get(dev);
3988                         if (!idev)
3989                                 goto cont;
3990                         if (inet6_fill_ifinfo(skb, idev,
3991                                               NETLINK_CB(cb->skb).pid,
3992                                               cb->nlh->nlmsg_seq,
3993                                               RTM_NEWLINK, NLM_F_MULTI) <= 0)
3994                                 goto out;
3995 cont:
3996                         idx++;
3997                 }
3998         }
3999 out:
4000         rcu_read_unlock();
4001         cb->args[1] = idx;
4002         cb->args[0] = h;
4003
4004         return skb->len;
4005 }
4006
4007 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4008 {
4009         struct sk_buff *skb;
4010         struct net *net = dev_net(idev->dev);
4011         int err = -ENOBUFS;
4012
4013         skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
4014         if (skb == NULL)
4015                 goto errout;
4016
4017         err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
4018         if (err < 0) {
4019                 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4020                 WARN_ON(err == -EMSGSIZE);
4021                 kfree_skb(skb);
4022                 goto errout;
4023         }
4024         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4025         return;
4026 errout:
4027         if (err < 0)
4028                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
4029 }
4030
4031 static inline size_t inet6_prefix_nlmsg_size(void)
4032 {
4033         return NLMSG_ALIGN(sizeof(struct prefixmsg))
4034                + nla_total_size(sizeof(struct in6_addr))
4035                + nla_total_size(sizeof(struct prefix_cacheinfo));
4036 }
4037
4038 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
4039                              struct prefix_info *pinfo, u32 pid, u32 seq,
4040                              int event, unsigned int flags)
4041 {
4042         struct prefixmsg *pmsg;
4043         struct nlmsghdr *nlh;
4044         struct prefix_cacheinfo ci;
4045
4046         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
4047         if (nlh == NULL)
4048                 return -EMSGSIZE;
4049
4050         pmsg = nlmsg_data(nlh);
4051         pmsg->prefix_family = AF_INET6;
4052         pmsg->prefix_pad1 = 0;
4053         pmsg->prefix_pad2 = 0;
4054         pmsg->prefix_ifindex = idev->dev->ifindex;
4055         pmsg->prefix_len = pinfo->prefix_len;
4056         pmsg->prefix_type = pinfo->type;
4057         pmsg->prefix_pad3 = 0;
4058         pmsg->prefix_flags = 0;
4059         if (pinfo->onlink)
4060                 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4061         if (pinfo->autoconf)
4062                 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4063
4064         NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
4065
4066         ci.preferred_time = ntohl(pinfo->prefered);
4067         ci.valid_time = ntohl(pinfo->valid);
4068         NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
4069
4070         return nlmsg_end(skb, nlh);
4071
4072 nla_put_failure:
4073         nlmsg_cancel(skb, nlh);
4074         return -EMSGSIZE;
4075 }
4076
4077 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
4078                          struct prefix_info *pinfo)
4079 {
4080         struct sk_buff *skb;
4081         struct net *net = dev_net(idev->dev);
4082         int err = -ENOBUFS;
4083
4084         skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
4085         if (skb == NULL)
4086                 goto errout;
4087
4088         err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
4089         if (err < 0) {
4090                 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4091                 WARN_ON(err == -EMSGSIZE);
4092                 kfree_skb(skb);
4093                 goto errout;
4094         }
4095         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4096         return;
4097 errout:
4098         if (err < 0)
4099                 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
4100 }
4101
4102 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4103 {
4104         inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4105
4106         switch (event) {
4107         case RTM_NEWADDR:
4108                 /*
4109                  * If the address was optimistic
4110                  * we inserted the route at the start of
4111                  * our DAD process, so we don't need
4112                  * to do it again
4113                  */
4114                 if (!(ifp->rt->rt6i_node))
4115                         ip6_ins_rt(ifp->rt);
4116                 if (ifp->idev->cnf.forwarding)
4117                         addrconf_join_anycast(ifp);
4118                 break;
4119         case RTM_DELADDR:
4120                 if (ifp->idev->cnf.forwarding)
4121                         addrconf_leave_anycast(ifp);
4122                 addrconf_leave_solict(ifp->idev, &ifp->addr);
4123                 dst_hold(&ifp->rt->dst);
4124
4125                 if (ifp->state == INET6_IFADDR_STATE_DEAD &&
4126                     ip6_del_rt(ifp->rt))
4127                         dst_free(&ifp->rt->dst);
4128                 break;
4129         }
4130 }
4131
4132 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4133 {
4134         rcu_read_lock_bh();
4135         if (likely(ifp->idev->dead == 0))
4136                 __ipv6_ifa_notify(event, ifp);
4137         rcu_read_unlock_bh();
4138 }
4139
4140 #ifdef CONFIG_SYSCTL
4141
4142 static
4143 int addrconf_sysctl_forward(ctl_table *ctl, int write,
4144                            void __user *buffer, size_t *lenp, loff_t *ppos)
4145 {
4146         int *valp = ctl->data;
4147         int val = *valp;
4148         loff_t pos = *ppos;
4149         int ret;
4150
4151         ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
4152
4153         if (write)
4154                 ret = addrconf_fixup_forwarding(ctl, valp, val);
4155         if (ret)
4156                 *ppos = pos;
4157         return ret;
4158 }
4159
4160 static void dev_disable_change(struct inet6_dev *idev)
4161 {
4162         if (!idev || !idev->dev)
4163                 return;
4164
4165         if (idev->cnf.disable_ipv6)
4166                 addrconf_notify(NULL, NETDEV_DOWN, idev->dev);
4167         else
4168                 addrconf_notify(NULL, NETDEV_UP, idev->dev);
4169 }
4170
4171 static void addrconf_disable_change(struct net *net, __s32 newf)
4172 {
4173         struct net_device *dev;
4174         struct inet6_dev *idev;
4175
4176         rcu_read_lock();
4177         for_each_netdev_rcu(net, dev) {
4178                 idev = __in6_dev_get(dev);
4179                 if (idev) {
4180                         int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4181                         idev->cnf.disable_ipv6 = newf;
4182                         if (changed)
4183                                 dev_disable_change(idev);
4184                 }
4185         }
4186         rcu_read_unlock();
4187 }
4188
4189 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int old)
4190 {
4191         struct net *net;
4192
4193         net = (struct net *)table->extra2;
4194
4195         if (p == &net->ipv6.devconf_dflt->disable_ipv6)
4196                 return 0;
4197
4198         if (!rtnl_trylock()) {
4199                 /* Restore the original values before restarting */
4200                 *p = old;
4201                 return restart_syscall();
4202         }
4203
4204         if (p == &net->ipv6.devconf_all->disable_ipv6) {
4205                 __s32 newf = net->ipv6.devconf_all->disable_ipv6;
4206                 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4207                 addrconf_disable_change(net, newf);
4208         } else if ((!*p) ^ (!old))
4209                 dev_disable_change((struct inet6_dev *)table->extra1);
4210
4211         rtnl_unlock();
4212         return 0;
4213 }
4214
4215 static
4216 int addrconf_sysctl_disable(ctl_table *ctl, int write,
4217                             void __user *buffer, size_t *lenp, loff_t *ppos)
4218 {
4219         int *valp = ctl->data;
4220         int val = *valp;
4221         loff_t pos = *ppos;
4222         int ret;
4223
4224         ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
4225
4226         if (write)
4227                 ret = addrconf_disable_ipv6(ctl, valp, val);
4228         if (ret)
4229                 *ppos = pos;
4230         return ret;
4231 }
4232
4233 static struct addrconf_sysctl_table
4234 {
4235         struct ctl_table_header *sysctl_header;
4236         ctl_table addrconf_vars[DEVCONF_MAX+1];
4237         char *dev_name;
4238 } addrconf_sysctl __read_mostly = {
4239         .sysctl_header = NULL,
4240         .addrconf_vars = {
4241                 {
4242                         .procname       = "forwarding",
4243                         .data           = &ipv6_devconf.forwarding,
4244                         .maxlen         = sizeof(int),
4245                         .mode           = 0644,
4246                         .proc_handler   = addrconf_sysctl_forward,
4247                 },
4248                 {
4249                         .procname       = "hop_limit",
4250                         .data           = &ipv6_devconf.hop_limit,
4251                         .maxlen         = sizeof(int),
4252                         .mode           = 0644,
4253                         .proc_handler   = proc_dointvec,
4254                 },
4255                 {
4256                         .procname       = "mtu",
4257                         .data           = &ipv6_devconf.mtu6,
4258                         .maxlen         = sizeof(int),
4259                         .mode           = 0644,
4260                         .proc_handler   = proc_dointvec,
4261                 },
4262                 {
4263                         .procname       = "accept_ra",
4264                         .data           = &ipv6_devconf.accept_ra,
4265                         .maxlen         = sizeof(int),
4266                         .mode           = 0644,
4267                         .proc_handler   = proc_dointvec,
4268                 },
4269                 {
4270                         .procname       = "accept_redirects",
4271                         .data           = &ipv6_devconf.accept_redirects,
4272                         .maxlen         = sizeof(int),
4273                         .mode           = 0644,
4274                         .proc_handler   = proc_dointvec,
4275                 },
4276                 {
4277                         .procname       = "autoconf",
4278                         .data           = &ipv6_devconf.autoconf,
4279                         .maxlen         = sizeof(int),
4280                         .mode           = 0644,
4281                         .proc_handler   = proc_dointvec,
4282                 },
4283                 {
4284                         .procname       = "dad_transmits",
4285                         .data           = &ipv6_devconf.dad_transmits,
4286                         .maxlen         = sizeof(int),
4287                         .mode           = 0644,
4288                         .proc_handler   = proc_dointvec,
4289                 },
4290                 {
4291                         .procname       = "router_solicitations",
4292                         .data           = &ipv6_devconf.rtr_solicits,
4293                         .maxlen         = sizeof(int),
4294                         .mode           = 0644,
4295                         .proc_handler   = proc_dointvec,
4296                 },
4297                 {
4298                         .procname       = "router_solicitation_interval",
4299                         .data           = &ipv6_devconf.rtr_solicit_interval,
4300                         .maxlen         = sizeof(int),
4301                         .mode           = 0644,
4302                         .proc_handler   = proc_dointvec_jiffies,
4303                 },
4304                 {
4305                         .procname       = "router_solicitation_delay",
4306                         .data           = &ipv6_devconf.rtr_solicit_delay,
4307                         .maxlen         = sizeof(int),
4308                         .mode           = 0644,
4309                         .proc_handler   = proc_dointvec_jiffies,
4310                 },
4311                 {
4312                         .procname       = "force_mld_version",
4313                         .data           = &ipv6_devconf.force_mld_version,
4314                         .maxlen         = sizeof(int),
4315                         .mode           = 0644,
4316                         .proc_handler   = proc_dointvec,
4317                 },
4318 #ifdef CONFIG_IPV6_PRIVACY
4319                 {
4320                         .procname       = "use_tempaddr",
4321                         .data           = &ipv6_devconf.use_tempaddr,
4322                         .maxlen         = sizeof(int),
4323                         .mode           = 0644,
4324                         .proc_handler   = proc_dointvec,
4325                 },
4326                 {
4327                         .procname       = "temp_valid_lft",
4328                         .data           = &ipv6_devconf.temp_valid_lft,
4329                         .maxlen         = sizeof(int),
4330                         .mode           = 0644,
4331                         .proc_handler   = proc_dointvec,
4332                 },
4333                 {
4334                         .procname       = "temp_prefered_lft",
4335                         .data           = &ipv6_devconf.temp_prefered_lft,
4336                         .maxlen         = sizeof(int),
4337                         .mode           = 0644,
4338                         .proc_handler   = proc_dointvec,
4339                 },
4340                 {
4341                         .procname       = "regen_max_retry",
4342                         .data           = &ipv6_devconf.regen_max_retry,
4343                         .maxlen         = sizeof(int),
4344                         .mode           = 0644,
4345                         .proc_handler   = proc_dointvec,
4346                 },
4347                 {
4348                         .procname       = "max_desync_factor",
4349                         .data           = &ipv6_devconf.max_desync_factor,
4350                         .maxlen         = sizeof(int),
4351                         .mode           = 0644,
4352                         .proc_handler   = proc_dointvec,
4353                 },
4354 #endif
4355                 {
4356                         .procname       = "max_addresses",
4357                         .data           = &ipv6_devconf.max_addresses,
4358                         .maxlen         = sizeof(int),
4359                         .mode           = 0644,
4360                         .proc_handler   = proc_dointvec,
4361                 },
4362                 {
4363                         .procname       = "accept_ra_defrtr",
4364                         .data           = &ipv6_devconf.accept_ra_defrtr,
4365                         .maxlen         = sizeof(int),
4366                         .mode           = 0644,
4367                         .proc_handler   = proc_dointvec,
4368                 },
4369                 {
4370                         .procname       = "accept_ra_pinfo",
4371                         .data           = &ipv6_devconf.accept_ra_pinfo,
4372                         .maxlen         = sizeof(int),
4373                         .mode           = 0644,
4374                         .proc_handler   = proc_dointvec,
4375                 },
4376 #ifdef CONFIG_IPV6_ROUTER_PREF
4377                 {
4378                         .procname       = "accept_ra_rtr_pref",
4379                         .data           = &ipv6_devconf.accept_ra_rtr_pref,
4380                         .maxlen         = sizeof(int),
4381                         .mode           = 0644,
4382                         .proc_handler   = proc_dointvec,
4383                 },
4384                 {
4385                         .procname       = "router_probe_interval",
4386                         .data           = &ipv6_devconf.rtr_probe_interval,
4387                         .maxlen         = sizeof(int),
4388                         .mode           = 0644,
4389                         .proc_handler   = proc_dointvec_jiffies,
4390                 },
4391 #ifdef CONFIG_IPV6_ROUTE_INFO
4392                 {
4393                         .procname       = "accept_ra_rt_info_max_plen",
4394                         .data           = &ipv6_devconf.accept_ra_rt_info_max_plen,
4395                         .maxlen         = sizeof(int),
4396                         .mode           = 0644,
4397                         .proc_handler   = proc_dointvec,
4398                 },
4399 #endif
4400 #endif
4401                 {
4402                         .procname       = "proxy_ndp",
4403                         .data           = &ipv6_devconf.proxy_ndp,
4404                         .maxlen         = sizeof(int),
4405                         .mode           = 0644,
4406                         .proc_handler   = proc_dointvec,
4407                 },
4408                 {
4409                         .procname       = "accept_source_route",
4410                         .data           = &ipv6_devconf.accept_source_route,
4411                         .maxlen         = sizeof(int),
4412                         .mode           = 0644,
4413                         .proc_handler   = proc_dointvec,
4414                 },
4415 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4416                 {
4417                         .procname       = "optimistic_dad",
4418                         .data           = &ipv6_devconf.optimistic_dad,
4419                         .maxlen         = sizeof(int),
4420                         .mode           = 0644,
4421                         .proc_handler   = proc_dointvec,
4422
4423                 },
4424 #endif
4425 #ifdef CONFIG_IPV6_MROUTE
4426                 {
4427                         .procname       = "mc_forwarding",
4428                         .data           = &ipv6_devconf.mc_forwarding,
4429                         .maxlen         = sizeof(int),
4430                         .mode           = 0444,
4431                         .proc_handler   = proc_dointvec,
4432                 },
4433 #endif
4434                 {
4435                         .procname       = "disable_ipv6",
4436                         .data           = &ipv6_devconf.disable_ipv6,
4437                         .maxlen         = sizeof(int),
4438                         .mode           = 0644,
4439                         .proc_handler   = addrconf_sysctl_disable,
4440                 },
4441                 {
4442                         .procname       = "accept_dad",
4443                         .data           = &ipv6_devconf.accept_dad,
4444                         .maxlen         = sizeof(int),
4445                         .mode           = 0644,
4446                         .proc_handler   = proc_dointvec,
4447                 },
4448                 {
4449                         .procname       = "force_tllao",
4450                         .data           = &ipv6_devconf.force_tllao,
4451                         .maxlen         = sizeof(int),
4452                         .mode           = 0644,
4453                         .proc_handler   = proc_dointvec
4454                 },
4455                 {
4456                         /* sentinel */
4457                 }
4458         },
4459 };
4460
4461 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4462                 struct inet6_dev *idev, struct ipv6_devconf *p)
4463 {
4464         int i;
4465         struct addrconf_sysctl_table *t;
4466
4467 #define ADDRCONF_CTL_PATH_DEV   3
4468
4469         struct ctl_path addrconf_ctl_path[] = {
4470                 { .procname = "net", },
4471                 { .procname = "ipv6", },
4472                 { .procname = "conf", },
4473                 { /* to be set */ },
4474                 { },
4475         };
4476
4477
4478         t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4479         if (t == NULL)
4480                 goto out;
4481
4482         for (i = 0; t->addrconf_vars[i].data; i++) {
4483                 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
4484                 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4485                 t->addrconf_vars[i].extra2 = net;
4486         }
4487
4488         /*
4489          * Make a copy of dev_name, because '.procname' is regarded as const
4490          * by sysctl and we wouldn't want anyone to change it under our feet
4491          * (see SIOCSIFNAME).
4492          */
4493         t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4494         if (!t->dev_name)
4495                 goto free;
4496
4497         addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
4498
4499         t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
4500                         t->addrconf_vars);
4501         if (t->sysctl_header == NULL)
4502                 goto free_procname;
4503
4504         p->sysctl = t;
4505         return 0;
4506
4507 free_procname:
4508         kfree(t->dev_name);
4509 free:
4510         kfree(t);
4511 out:
4512         return -ENOBUFS;
4513 }
4514
4515 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4516 {
4517         struct addrconf_sysctl_table *t;
4518
4519         if (p->sysctl == NULL)
4520                 return;
4521
4522         t = p->sysctl;
4523         p->sysctl = NULL;
4524         unregister_sysctl_table(t->sysctl_header);
4525         kfree(t->dev_name);
4526         kfree(t);
4527 }
4528
4529 static void addrconf_sysctl_register(struct inet6_dev *idev)
4530 {
4531         neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
4532                               &ndisc_ifinfo_sysctl_change);
4533         __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
4534                                         idev, &idev->cnf);
4535 }
4536
4537 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
4538 {
4539         __addrconf_sysctl_unregister(&idev->cnf);
4540         neigh_sysctl_unregister(idev->nd_parms);
4541 }
4542
4543
4544 #endif
4545
4546 static int __net_init addrconf_init_net(struct net *net)
4547 {
4548         int err;
4549         struct ipv6_devconf *all, *dflt;
4550
4551         err = -ENOMEM;
4552         all = &ipv6_devconf;
4553         dflt = &ipv6_devconf_dflt;
4554
4555         if (!net_eq(net, &init_net)) {
4556                 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4557                 if (all == NULL)
4558                         goto err_alloc_all;
4559
4560                 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4561                 if (dflt == NULL)
4562                         goto err_alloc_dflt;
4563         } else {
4564                 /* these will be inherited by all namespaces */
4565                 dflt->autoconf = ipv6_defaults.autoconf;
4566                 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
4567         }
4568
4569         net->ipv6.devconf_all = all;
4570         net->ipv6.devconf_dflt = dflt;
4571
4572 #ifdef CONFIG_SYSCTL
4573         err = __addrconf_sysctl_register(net, "all", NULL, all);
4574         if (err < 0)
4575                 goto err_reg_all;
4576
4577         err = __addrconf_sysctl_register(net, "default", NULL, dflt);
4578         if (err < 0)
4579                 goto err_reg_dflt;
4580 #endif
4581         return 0;
4582
4583 #ifdef CONFIG_SYSCTL
4584 err_reg_dflt:
4585         __addrconf_sysctl_unregister(all);
4586 err_reg_all:
4587         kfree(dflt);
4588 #endif
4589 err_alloc_dflt:
4590         kfree(all);
4591 err_alloc_all:
4592         return err;
4593 }
4594
4595 static void __net_exit addrconf_exit_net(struct net *net)
4596 {
4597 #ifdef CONFIG_SYSCTL
4598         __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4599         __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4600 #endif
4601         if (!net_eq(net, &init_net)) {
4602                 kfree(net->ipv6.devconf_dflt);
4603                 kfree(net->ipv6.devconf_all);
4604         }
4605 }
4606
4607 static struct pernet_operations addrconf_ops = {
4608         .init = addrconf_init_net,
4609         .exit = addrconf_exit_net,
4610 };
4611
4612 /*
4613  *      Device notifier
4614  */
4615
4616 int register_inet6addr_notifier(struct notifier_block *nb)
4617 {
4618         return atomic_notifier_chain_register(&inet6addr_chain, nb);
4619 }
4620 EXPORT_SYMBOL(register_inet6addr_notifier);
4621
4622 int unregister_inet6addr_notifier(struct notifier_block *nb)
4623 {
4624         return atomic_notifier_chain_unregister(&inet6addr_chain, nb);
4625 }
4626 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4627
4628 /*
4629  *      Init / cleanup code
4630  */
4631
4632 int __init addrconf_init(void)
4633 {
4634         int i, err;
4635
4636         err = ipv6_addr_label_init();
4637         if (err < 0) {
4638                 printk(KERN_CRIT "IPv6 Addrconf:"
4639                        " cannot initialize default policy table: %d.\n", err);
4640                 goto out;
4641         }
4642
4643         err = register_pernet_subsys(&addrconf_ops);
4644         if (err < 0)
4645                 goto out_addrlabel;
4646
4647         /* The addrconf netdev notifier requires that loopback_dev
4648          * has it's ipv6 private information allocated and setup
4649          * before it can bring up and give link-local addresses
4650          * to other devices which are up.
4651          *
4652          * Unfortunately, loopback_dev is not necessarily the first
4653          * entry in the global dev_base list of net devices.  In fact,
4654          * it is likely to be the very last entry on that list.
4655          * So this causes the notifier registry below to try and
4656          * give link-local addresses to all devices besides loopback_dev
4657          * first, then loopback_dev, which cases all the non-loopback_dev
4658          * devices to fail to get a link-local address.
4659          *
4660          * So, as a temporary fix, allocate the ipv6 structure for
4661          * loopback_dev first by hand.
4662          * Longer term, all of the dependencies ipv6 has upon the loopback
4663          * device and it being up should be removed.
4664          */
4665         rtnl_lock();
4666         if (!ipv6_add_dev(init_net.loopback_dev))
4667                 err = -ENOMEM;
4668         rtnl_unlock();
4669         if (err)
4670                 goto errlo;
4671
4672         for (i = 0; i < IN6_ADDR_HSIZE; i++)
4673                 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
4674
4675         register_netdevice_notifier(&ipv6_dev_notf);
4676
4677         addrconf_verify(0);
4678
4679         err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4680         if (err < 0)
4681                 goto errout;
4682
4683         /* Only the first call to __rtnl_register can fail */
4684         __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4685         __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4686         __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4687         __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4688         __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4689
4690         ipv6_addr_label_rtnl_register();
4691
4692         return 0;
4693 errout:
4694         unregister_netdevice_notifier(&ipv6_dev_notf);
4695 errlo:
4696         unregister_pernet_subsys(&addrconf_ops);
4697 out_addrlabel:
4698         ipv6_addr_label_cleanup();
4699 out:
4700         return err;
4701 }
4702
4703 void addrconf_cleanup(void)
4704 {
4705         struct net_device *dev;
4706         int i;
4707
4708         unregister_netdevice_notifier(&ipv6_dev_notf);
4709         unregister_pernet_subsys(&addrconf_ops);
4710         ipv6_addr_label_cleanup();
4711
4712         rtnl_lock();
4713
4714         /* clean dev list */
4715         for_each_netdev(&init_net, dev) {
4716                 if (__in6_dev_get(dev) == NULL)
4717                         continue;
4718                 addrconf_ifdown(dev, 1);
4719         }
4720         addrconf_ifdown(init_net.loopback_dev, 2);
4721
4722         /*
4723          *      Check hash table.
4724          */
4725         spin_lock_bh(&addrconf_hash_lock);
4726         for (i = 0; i < IN6_ADDR_HSIZE; i++)
4727                 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
4728         spin_unlock_bh(&addrconf_hash_lock);
4729
4730         del_timer(&addr_chk_timer);
4731         rtnl_unlock();
4732 }