ipv6: Fix warning in addrconf code.
[~shefty/rdma-dev.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/socket.h>
44 #include <linux/sockios.h>
45 #include <linux/net.h>
46 #include <linux/in6.h>
47 #include <linux/netdevice.h>
48 #include <linux/if_addr.h>
49 #include <linux/if_arp.h>
50 #include <linux/if_arcnet.h>
51 #include <linux/if_infiniband.h>
52 #include <linux/route.h>
53 #include <linux/inetdevice.h>
54 #include <linux/init.h>
55 #ifdef CONFIG_SYSCTL
56 #include <linux/sysctl.h>
57 #endif
58 #include <linux/capability.h>
59 #include <linux/delay.h>
60 #include <linux/notifier.h>
61 #include <linux/string.h>
62
63 #include <net/net_namespace.h>
64 #include <net/sock.h>
65 #include <net/snmp.h>
66
67 #include <net/ipv6.h>
68 #include <net/protocol.h>
69 #include <net/ndisc.h>
70 #include <net/ip6_route.h>
71 #include <net/addrconf.h>
72 #include <net/tcp.h>
73 #include <net/ip.h>
74 #include <net/netlink.h>
75 #include <net/pkt_sched.h>
76 #include <linux/if_tunnel.h>
77 #include <linux/rtnetlink.h>
78
79 #ifdef CONFIG_IPV6_PRIVACY
80 #include <linux/random.h>
81 #endif
82
83 #include <asm/uaccess.h>
84 #include <asm/unaligned.h>
85
86 #include <linux/proc_fs.h>
87 #include <linux/seq_file.h>
88
89 /* Set to 3 to get tracing... */
90 #define ACONF_DEBUG 2
91
92 #if ACONF_DEBUG >= 3
93 #define ADBG(x) printk x
94 #else
95 #define ADBG(x)
96 #endif
97
98 #define INFINITY_LIFE_TIME      0xFFFFFFFF
99 #define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b)))
100
101 #ifdef CONFIG_SYSCTL
102 static void addrconf_sysctl_register(struct inet6_dev *idev);
103 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
104 #else
105 static inline void addrconf_sysctl_register(struct inet6_dev *idev)
106 {
107 }
108
109 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
110 {
111 }
112 #endif
113
114 #ifdef CONFIG_IPV6_PRIVACY
115 static int __ipv6_regen_rndid(struct inet6_dev *idev);
116 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
117 static void ipv6_regen_rndid(unsigned long data);
118
119 static int desync_factor = MAX_DESYNC_FACTOR * HZ;
120 #endif
121
122 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
123 static int ipv6_count_addresses(struct inet6_dev *idev);
124
125 /*
126  *      Configured unicast address hash table
127  */
128 static struct inet6_ifaddr              *inet6_addr_lst[IN6_ADDR_HSIZE];
129 static DEFINE_RWLOCK(addrconf_hash_lock);
130
131 static void addrconf_verify(unsigned long);
132
133 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
134 static DEFINE_SPINLOCK(addrconf_verify_lock);
135
136 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
137 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
138
139 static int addrconf_ifdown(struct net_device *dev, int how);
140
141 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
142 static void addrconf_dad_timer(unsigned long data);
143 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
144 static void addrconf_dad_run(struct inet6_dev *idev);
145 static void addrconf_rs_timer(unsigned long data);
146 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
147 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
148
149 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
150                                 struct prefix_info *pinfo);
151 static int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
152                               struct net_device *dev);
153
154 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
155
156 struct ipv6_devconf ipv6_devconf __read_mostly = {
157         .forwarding             = 0,
158         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
159         .mtu6                   = IPV6_MIN_MTU,
160         .accept_ra              = 1,
161         .accept_redirects       = 1,
162         .autoconf               = 1,
163         .force_mld_version      = 0,
164         .dad_transmits          = 1,
165         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
166         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
167         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
168 #ifdef CONFIG_IPV6_PRIVACY
169         .use_tempaddr           = 0,
170         .temp_valid_lft         = TEMP_VALID_LIFETIME,
171         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
172         .regen_max_retry        = REGEN_MAX_RETRY,
173         .max_desync_factor      = MAX_DESYNC_FACTOR,
174 #endif
175         .max_addresses          = IPV6_MAX_ADDRESSES,
176         .accept_ra_defrtr       = 1,
177         .accept_ra_pinfo        = 1,
178 #ifdef CONFIG_IPV6_ROUTER_PREF
179         .accept_ra_rtr_pref     = 1,
180         .rtr_probe_interval     = 60 * HZ,
181 #ifdef CONFIG_IPV6_ROUTE_INFO
182         .accept_ra_rt_info_max_plen = 0,
183 #endif
184 #endif
185         .proxy_ndp              = 0,
186         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
187         .disable_ipv6           = 0,
188         .accept_dad             = 1,
189 };
190
191 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
192         .forwarding             = 0,
193         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
194         .mtu6                   = IPV6_MIN_MTU,
195         .accept_ra              = 1,
196         .accept_redirects       = 1,
197         .autoconf               = 1,
198         .dad_transmits          = 1,
199         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
200         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
201         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
202 #ifdef CONFIG_IPV6_PRIVACY
203         .use_tempaddr           = 0,
204         .temp_valid_lft         = TEMP_VALID_LIFETIME,
205         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
206         .regen_max_retry        = REGEN_MAX_RETRY,
207         .max_desync_factor      = MAX_DESYNC_FACTOR,
208 #endif
209         .max_addresses          = IPV6_MAX_ADDRESSES,
210         .accept_ra_defrtr       = 1,
211         .accept_ra_pinfo        = 1,
212 #ifdef CONFIG_IPV6_ROUTER_PREF
213         .accept_ra_rtr_pref     = 1,
214         .rtr_probe_interval     = 60 * HZ,
215 #ifdef CONFIG_IPV6_ROUTE_INFO
216         .accept_ra_rt_info_max_plen = 0,
217 #endif
218 #endif
219         .proxy_ndp              = 0,
220         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
221         .disable_ipv6           = 0,
222         .accept_dad             = 1,
223 };
224
225 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
226 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
227 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
228 const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
229 const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
230
231 /* Check if a valid qdisc is available */
232 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
233 {
234         return !qdisc_tx_is_noop(dev);
235 }
236
237 /* Check if a route is valid prefix route */
238 static inline int addrconf_is_prefix_route(const struct rt6_info *rt)
239 {
240         return ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0);
241 }
242
243 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
244 {
245         if (del_timer(&ifp->timer))
246                 __in6_ifa_put(ifp);
247 }
248
249 enum addrconf_timer_t
250 {
251         AC_NONE,
252         AC_DAD,
253         AC_RS,
254 };
255
256 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
257                                enum addrconf_timer_t what,
258                                unsigned long when)
259 {
260         if (!del_timer(&ifp->timer))
261                 in6_ifa_hold(ifp);
262
263         switch (what) {
264         case AC_DAD:
265                 ifp->timer.function = addrconf_dad_timer;
266                 break;
267         case AC_RS:
268                 ifp->timer.function = addrconf_rs_timer;
269                 break;
270         default:;
271         }
272         ifp->timer.expires = jiffies + when;
273         add_timer(&ifp->timer);
274 }
275
276 static int snmp6_alloc_dev(struct inet6_dev *idev)
277 {
278         if (snmp_mib_init((void **)idev->stats.ipv6,
279                           sizeof(struct ipstats_mib)) < 0)
280                 goto err_ip;
281         if (snmp_mib_init((void **)idev->stats.icmpv6,
282                           sizeof(struct icmpv6_mib)) < 0)
283                 goto err_icmp;
284         if (snmp_mib_init((void **)idev->stats.icmpv6msg,
285                           sizeof(struct icmpv6msg_mib)) < 0)
286                 goto err_icmpmsg;
287
288         return 0;
289
290 err_icmpmsg:
291         snmp_mib_free((void **)idev->stats.icmpv6);
292 err_icmp:
293         snmp_mib_free((void **)idev->stats.ipv6);
294 err_ip:
295         return -ENOMEM;
296 }
297
298 static void snmp6_free_dev(struct inet6_dev *idev)
299 {
300         snmp_mib_free((void **)idev->stats.icmpv6msg);
301         snmp_mib_free((void **)idev->stats.icmpv6);
302         snmp_mib_free((void **)idev->stats.ipv6);
303 }
304
305 /* Nobody refers to this device, we may destroy it. */
306
307 static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
308 {
309         struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
310         kfree(idev);
311 }
312
313 void in6_dev_finish_destroy(struct inet6_dev *idev)
314 {
315         struct net_device *dev = idev->dev;
316         BUG_TRAP(idev->addr_list==NULL);
317         BUG_TRAP(idev->mc_list==NULL);
318 #ifdef NET_REFCNT_DEBUG
319         printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
320 #endif
321         dev_put(dev);
322         if (!idev->dead) {
323                 printk("Freeing alive inet6 device %p\n", idev);
324                 return;
325         }
326         snmp6_free_dev(idev);
327         call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
328 }
329
330 EXPORT_SYMBOL(in6_dev_finish_destroy);
331
332 static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
333 {
334         struct inet6_dev *ndev;
335
336         ASSERT_RTNL();
337
338         if (dev->mtu < IPV6_MIN_MTU)
339                 return NULL;
340
341         ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
342
343         if (ndev == NULL)
344                 return NULL;
345
346         rwlock_init(&ndev->lock);
347         ndev->dev = dev;
348         memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
349         ndev->cnf.mtu6 = dev->mtu;
350         ndev->cnf.sysctl = NULL;
351         ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
352         if (ndev->nd_parms == NULL) {
353                 kfree(ndev);
354                 return NULL;
355         }
356         if (ndev->cnf.forwarding)
357                 dev_disable_lro(dev);
358         /* We refer to the device */
359         dev_hold(dev);
360
361         if (snmp6_alloc_dev(ndev) < 0) {
362                 ADBG((KERN_WARNING
363                         "%s(): cannot allocate memory for statistics; dev=%s.\n",
364                         __func__, dev->name));
365                 neigh_parms_release(&nd_tbl, ndev->nd_parms);
366                 ndev->dead = 1;
367                 in6_dev_finish_destroy(ndev);
368                 return NULL;
369         }
370
371         if (snmp6_register_dev(ndev) < 0) {
372                 ADBG((KERN_WARNING
373                         "%s(): cannot create /proc/net/dev_snmp6/%s\n",
374                         __func__, dev->name));
375                 neigh_parms_release(&nd_tbl, ndev->nd_parms);
376                 ndev->dead = 1;
377                 in6_dev_finish_destroy(ndev);
378                 return NULL;
379         }
380
381         /* One reference from device.  We must do this before
382          * we invoke __ipv6_regen_rndid().
383          */
384         in6_dev_hold(ndev);
385
386         if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
387                 ndev->cnf.accept_dad = -1;
388
389 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
390         if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
391                 printk(KERN_INFO
392                        "%s: Disabled Multicast RS\n",
393                        dev->name);
394                 ndev->cnf.rtr_solicits = 0;
395         }
396 #endif
397
398 #ifdef CONFIG_IPV6_PRIVACY
399         setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
400         if ((dev->flags&IFF_LOOPBACK) ||
401             dev->type == ARPHRD_TUNNEL ||
402             dev->type == ARPHRD_TUNNEL6 ||
403             dev->type == ARPHRD_SIT ||
404             dev->type == ARPHRD_NONE) {
405                 printk(KERN_INFO
406                        "%s: Disabled Privacy Extensions\n",
407                        dev->name);
408                 ndev->cnf.use_tempaddr = -1;
409         } else {
410                 in6_dev_hold(ndev);
411                 ipv6_regen_rndid((unsigned long) ndev);
412         }
413 #endif
414
415         if (netif_running(dev) && addrconf_qdisc_ok(dev))
416                 ndev->if_flags |= IF_READY;
417
418         ipv6_mc_init_dev(ndev);
419         ndev->tstamp = jiffies;
420         addrconf_sysctl_register(ndev);
421         /* protected by rtnl_lock */
422         rcu_assign_pointer(dev->ip6_ptr, ndev);
423
424         /* Join all-node multicast group */
425         ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
426
427         return ndev;
428 }
429
430 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
431 {
432         struct inet6_dev *idev;
433
434         ASSERT_RTNL();
435
436         if ((idev = __in6_dev_get(dev)) == NULL) {
437                 if ((idev = ipv6_add_dev(dev)) == NULL)
438                         return NULL;
439         }
440
441         if (dev->flags&IFF_UP)
442                 ipv6_mc_up(idev);
443         return idev;
444 }
445
446 #ifdef CONFIG_SYSCTL
447 static void dev_forward_change(struct inet6_dev *idev)
448 {
449         struct net_device *dev;
450         struct inet6_ifaddr *ifa;
451
452         if (!idev)
453                 return;
454         dev = idev->dev;
455         if (idev->cnf.forwarding)
456                 dev_disable_lro(dev);
457         if (dev && (dev->flags & IFF_MULTICAST)) {
458                 if (idev->cnf.forwarding)
459                         ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
460                 else
461                         ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
462         }
463         for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
464                 if (ifa->flags&IFA_F_TENTATIVE)
465                         continue;
466                 if (idev->cnf.forwarding)
467                         addrconf_join_anycast(ifa);
468                 else
469                         addrconf_leave_anycast(ifa);
470         }
471 }
472
473
474 static void addrconf_forward_change(struct net *net, __s32 newf)
475 {
476         struct net_device *dev;
477         struct inet6_dev *idev;
478
479         read_lock(&dev_base_lock);
480         for_each_netdev(net, dev) {
481                 rcu_read_lock();
482                 idev = __in6_dev_get(dev);
483                 if (idev) {
484                         int changed = (!idev->cnf.forwarding) ^ (!newf);
485                         idev->cnf.forwarding = newf;
486                         if (changed)
487                                 dev_forward_change(idev);
488                 }
489                 rcu_read_unlock();
490         }
491         read_unlock(&dev_base_lock);
492 }
493
494 static void addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old)
495 {
496         struct net *net;
497
498         net = (struct net *)table->extra2;
499         if (p == &net->ipv6.devconf_dflt->forwarding)
500                 return;
501
502         rtnl_lock();
503         if (p == &net->ipv6.devconf_all->forwarding) {
504                 __s32 newf = net->ipv6.devconf_all->forwarding;
505                 net->ipv6.devconf_dflt->forwarding = newf;
506                 addrconf_forward_change(net, newf);
507         } else if ((!*p) ^ (!old))
508                 dev_forward_change((struct inet6_dev *)table->extra1);
509         rtnl_unlock();
510
511         if (*p)
512                 rt6_purge_dflt_routers(net);
513 }
514 #endif
515
516 /* Nobody refers to this ifaddr, destroy it */
517
518 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
519 {
520         BUG_TRAP(ifp->if_next==NULL);
521         BUG_TRAP(ifp->lst_next==NULL);
522 #ifdef NET_REFCNT_DEBUG
523         printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
524 #endif
525
526         in6_dev_put(ifp->idev);
527
528         if (del_timer(&ifp->timer))
529                 printk("Timer is still running, when freeing ifa=%p\n", ifp);
530
531         if (!ifp->dead) {
532                 printk("Freeing alive inet6 address %p\n", ifp);
533                 return;
534         }
535         dst_release(&ifp->rt->u.dst);
536
537         kfree(ifp);
538 }
539
540 static void
541 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
542 {
543         struct inet6_ifaddr *ifa, **ifap;
544         int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
545
546         /*
547          * Each device address list is sorted in order of scope -
548          * global before linklocal.
549          */
550         for (ifap = &idev->addr_list; (ifa = *ifap) != NULL;
551              ifap = &ifa->if_next) {
552                 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
553                         break;
554         }
555
556         ifp->if_next = *ifap;
557         *ifap = ifp;
558 }
559
560 /*
561  *      Hash function taken from net_alias.c
562  */
563 static u8 ipv6_addr_hash(const struct in6_addr *addr)
564 {
565         __u32 word;
566
567         /*
568          * We perform the hash function over the last 64 bits of the address
569          * This will include the IEEE address token on links that support it.
570          */
571
572         word = (__force u32)(addr->s6_addr32[2] ^ addr->s6_addr32[3]);
573         word ^= (word >> 16);
574         word ^= (word >> 8);
575
576         return ((word ^ (word >> 4)) & 0x0f);
577 }
578
579 /* On success it returns ifp with increased reference count */
580
581 static struct inet6_ifaddr *
582 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
583               int scope, u32 flags)
584 {
585         struct inet6_ifaddr *ifa = NULL;
586         struct rt6_info *rt;
587         int hash;
588         int err = 0;
589         int addr_type = ipv6_addr_type(addr);
590
591         if (addr_type == IPV6_ADDR_ANY ||
592             addr_type & IPV6_ADDR_MULTICAST ||
593             (!(idev->dev->flags & IFF_LOOPBACK) &&
594              addr_type & IPV6_ADDR_LOOPBACK))
595                 return ERR_PTR(-EADDRNOTAVAIL);
596
597         rcu_read_lock_bh();
598         if (idev->dead) {
599                 err = -ENODEV;                  /*XXX*/
600                 goto out2;
601         }
602
603         write_lock(&addrconf_hash_lock);
604
605         /* Ignore adding duplicate addresses on an interface */
606         if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
607                 ADBG(("ipv6_add_addr: already assigned\n"));
608                 err = -EEXIST;
609                 goto out;
610         }
611
612         ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
613
614         if (ifa == NULL) {
615                 ADBG(("ipv6_add_addr: malloc failed\n"));
616                 err = -ENOBUFS;
617                 goto out;
618         }
619
620         rt = addrconf_dst_alloc(idev, addr, 0);
621         if (IS_ERR(rt)) {
622                 err = PTR_ERR(rt);
623                 goto out;
624         }
625
626         ipv6_addr_copy(&ifa->addr, addr);
627
628         spin_lock_init(&ifa->lock);
629         init_timer(&ifa->timer);
630         ifa->timer.data = (unsigned long) ifa;
631         ifa->scope = scope;
632         ifa->prefix_len = pfxlen;
633         ifa->flags = flags | IFA_F_TENTATIVE;
634         ifa->cstamp = ifa->tstamp = jiffies;
635
636         ifa->rt = rt;
637
638         /*
639          * part one of RFC 4429, section 3.3
640          * We should not configure an address as
641          * optimistic if we do not yet know the link
642          * layer address of our nexhop router
643          */
644
645         if (rt->rt6i_nexthop == NULL)
646                 ifa->flags &= ~IFA_F_OPTIMISTIC;
647
648         ifa->idev = idev;
649         in6_dev_hold(idev);
650         /* For caller */
651         in6_ifa_hold(ifa);
652
653         /* Add to big hash table */
654         hash = ipv6_addr_hash(addr);
655
656         ifa->lst_next = inet6_addr_lst[hash];
657         inet6_addr_lst[hash] = ifa;
658         in6_ifa_hold(ifa);
659         write_unlock(&addrconf_hash_lock);
660
661         write_lock(&idev->lock);
662         /* Add to inet6_dev unicast addr list. */
663         ipv6_link_dev_addr(idev, ifa);
664
665 #ifdef CONFIG_IPV6_PRIVACY
666         if (ifa->flags&IFA_F_TEMPORARY) {
667                 ifa->tmp_next = idev->tempaddr_list;
668                 idev->tempaddr_list = ifa;
669                 in6_ifa_hold(ifa);
670         }
671 #endif
672
673         in6_ifa_hold(ifa);
674         write_unlock(&idev->lock);
675 out2:
676         rcu_read_unlock_bh();
677
678         if (likely(err == 0))
679                 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
680         else {
681                 kfree(ifa);
682                 ifa = ERR_PTR(err);
683         }
684
685         return ifa;
686 out:
687         write_unlock(&addrconf_hash_lock);
688         goto out2;
689 }
690
691 /* This function wants to get referenced ifp and releases it before return */
692
693 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
694 {
695         struct inet6_ifaddr *ifa, **ifap;
696         struct inet6_dev *idev = ifp->idev;
697         int hash;
698         int deleted = 0, onlink = 0;
699         unsigned long expires = jiffies;
700
701         hash = ipv6_addr_hash(&ifp->addr);
702
703         ifp->dead = 1;
704
705         write_lock_bh(&addrconf_hash_lock);
706         for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
707              ifap = &ifa->lst_next) {
708                 if (ifa == ifp) {
709                         *ifap = ifa->lst_next;
710                         __in6_ifa_put(ifp);
711                         ifa->lst_next = NULL;
712                         break;
713                 }
714         }
715         write_unlock_bh(&addrconf_hash_lock);
716
717         write_lock_bh(&idev->lock);
718 #ifdef CONFIG_IPV6_PRIVACY
719         if (ifp->flags&IFA_F_TEMPORARY) {
720                 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
721                      ifap = &ifa->tmp_next) {
722                         if (ifa == ifp) {
723                                 *ifap = ifa->tmp_next;
724                                 if (ifp->ifpub) {
725                                         in6_ifa_put(ifp->ifpub);
726                                         ifp->ifpub = NULL;
727                                 }
728                                 __in6_ifa_put(ifp);
729                                 ifa->tmp_next = NULL;
730                                 break;
731                         }
732                 }
733         }
734 #endif
735
736         for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
737                 if (ifa == ifp) {
738                         *ifap = ifa->if_next;
739                         __in6_ifa_put(ifp);
740                         ifa->if_next = NULL;
741                         if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
742                                 break;
743                         deleted = 1;
744                         continue;
745                 } else if (ifp->flags & IFA_F_PERMANENT) {
746                         if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
747                                               ifp->prefix_len)) {
748                                 if (ifa->flags & IFA_F_PERMANENT) {
749                                         onlink = 1;
750                                         if (deleted)
751                                                 break;
752                                 } else {
753                                         unsigned long lifetime;
754
755                                         if (!onlink)
756                                                 onlink = -1;
757
758                                         spin_lock(&ifa->lock);
759
760                                         lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
761                                         /*
762                                          * Note: Because this address is
763                                          * not permanent, lifetime <
764                                          * LONG_MAX / HZ here.
765                                          */
766                                         if (time_before(expires,
767                                                         ifa->tstamp + lifetime * HZ))
768                                                 expires = ifa->tstamp + lifetime * HZ;
769                                         spin_unlock(&ifa->lock);
770                                 }
771                         }
772                 }
773                 ifap = &ifa->if_next;
774         }
775         write_unlock_bh(&idev->lock);
776
777         addrconf_del_timer(ifp);
778
779         ipv6_ifa_notify(RTM_DELADDR, ifp);
780
781         atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
782
783         /*
784          * Purge or update corresponding prefix
785          *
786          * 1) we don't purge prefix here if address was not permanent.
787          *    prefix is managed by its own lifetime.
788          * 2) if there're no addresses, delete prefix.
789          * 3) if there're still other permanent address(es),
790          *    corresponding prefix is still permanent.
791          * 4) otherwise, update prefix lifetime to the
792          *    longest valid lifetime among the corresponding
793          *    addresses on the device.
794          *    Note: subsequent RA will update lifetime.
795          *
796          * --yoshfuji
797          */
798         if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
799                 struct in6_addr prefix;
800                 struct rt6_info *rt;
801                 struct net *net = dev_net(ifp->idev->dev);
802                 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
803                 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1);
804
805                 if (rt && addrconf_is_prefix_route(rt)) {
806                         if (onlink == 0) {
807                                 ip6_del_rt(rt);
808                                 rt = NULL;
809                         } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
810                                 rt->rt6i_expires = expires;
811                                 rt->rt6i_flags |= RTF_EXPIRES;
812                         }
813                 }
814                 dst_release(&rt->u.dst);
815         }
816
817         in6_ifa_put(ifp);
818 }
819
820 #ifdef CONFIG_IPV6_PRIVACY
821 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
822 {
823         struct inet6_dev *idev = ifp->idev;
824         struct in6_addr addr, *tmpaddr;
825         unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
826         unsigned long regen_advance;
827         int tmp_plen;
828         int ret = 0;
829         int max_addresses;
830         u32 addr_flags;
831
832         write_lock(&idev->lock);
833         if (ift) {
834                 spin_lock_bh(&ift->lock);
835                 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
836                 spin_unlock_bh(&ift->lock);
837                 tmpaddr = &addr;
838         } else {
839                 tmpaddr = NULL;
840         }
841 retry:
842         in6_dev_hold(idev);
843         if (idev->cnf.use_tempaddr <= 0) {
844                 write_unlock(&idev->lock);
845                 printk(KERN_INFO
846                         "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
847                 in6_dev_put(idev);
848                 ret = -1;
849                 goto out;
850         }
851         spin_lock_bh(&ifp->lock);
852         if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
853                 idev->cnf.use_tempaddr = -1;    /*XXX*/
854                 spin_unlock_bh(&ifp->lock);
855                 write_unlock(&idev->lock);
856                 printk(KERN_WARNING
857                         "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
858                 in6_dev_put(idev);
859                 ret = -1;
860                 goto out;
861         }
862         in6_ifa_hold(ifp);
863         memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
864         if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
865                 spin_unlock_bh(&ifp->lock);
866                 write_unlock(&idev->lock);
867                 printk(KERN_WARNING
868                         "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
869                 in6_ifa_put(ifp);
870                 in6_dev_put(idev);
871                 ret = -1;
872                 goto out;
873         }
874         memcpy(&addr.s6_addr[8], idev->rndid, 8);
875         tmp_valid_lft = min_t(__u32,
876                               ifp->valid_lft,
877                               idev->cnf.temp_valid_lft);
878         tmp_prefered_lft = min_t(__u32,
879                                  ifp->prefered_lft,
880                                  idev->cnf.temp_prefered_lft - desync_factor / HZ);
881         tmp_plen = ifp->prefix_len;
882         max_addresses = idev->cnf.max_addresses;
883         tmp_cstamp = ifp->cstamp;
884         tmp_tstamp = ifp->tstamp;
885         spin_unlock_bh(&ifp->lock);
886
887         regen_advance = idev->cnf.regen_max_retry *
888                         idev->cnf.dad_transmits *
889                         idev->nd_parms->retrans_time / HZ;
890         write_unlock(&idev->lock);
891
892         /* A temporary address is created only if this calculated Preferred
893          * Lifetime is greater than REGEN_ADVANCE time units.  In particular,
894          * an implementation must not create a temporary address with a zero
895          * Preferred Lifetime.
896          */
897         if (tmp_prefered_lft <= regen_advance) {
898                 in6_ifa_put(ifp);
899                 in6_dev_put(idev);
900                 ret = -1;
901                 goto out;
902         }
903
904         addr_flags = IFA_F_TEMPORARY;
905         /* set in addrconf_prefix_rcv() */
906         if (ifp->flags & IFA_F_OPTIMISTIC)
907                 addr_flags |= IFA_F_OPTIMISTIC;
908
909         ift = !max_addresses ||
910               ipv6_count_addresses(idev) < max_addresses ?
911                 ipv6_add_addr(idev, &addr, tmp_plen,
912                               ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
913                               addr_flags) : NULL;
914         if (!ift || IS_ERR(ift)) {
915                 in6_ifa_put(ifp);
916                 in6_dev_put(idev);
917                 printk(KERN_INFO
918                         "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
919                 tmpaddr = &addr;
920                 write_lock(&idev->lock);
921                 goto retry;
922         }
923
924         spin_lock_bh(&ift->lock);
925         ift->ifpub = ifp;
926         ift->valid_lft = tmp_valid_lft;
927         ift->prefered_lft = tmp_prefered_lft;
928         ift->cstamp = tmp_cstamp;
929         ift->tstamp = tmp_tstamp;
930         spin_unlock_bh(&ift->lock);
931
932         addrconf_dad_start(ift, 0);
933         in6_ifa_put(ift);
934         in6_dev_put(idev);
935 out:
936         return ret;
937 }
938 #endif
939
940 /*
941  *      Choose an appropriate source address (RFC3484)
942  */
943 enum {
944         IPV6_SADDR_RULE_INIT = 0,
945         IPV6_SADDR_RULE_LOCAL,
946         IPV6_SADDR_RULE_SCOPE,
947         IPV6_SADDR_RULE_PREFERRED,
948 #ifdef CONFIG_IPV6_MIP6
949         IPV6_SADDR_RULE_HOA,
950 #endif
951         IPV6_SADDR_RULE_OIF,
952         IPV6_SADDR_RULE_LABEL,
953 #ifdef CONFIG_IPV6_PRIVACY
954         IPV6_SADDR_RULE_PRIVACY,
955 #endif
956         IPV6_SADDR_RULE_ORCHID,
957         IPV6_SADDR_RULE_PREFIX,
958         IPV6_SADDR_RULE_MAX
959 };
960
961 struct ipv6_saddr_score {
962         int                     rule;
963         int                     addr_type;
964         struct inet6_ifaddr     *ifa;
965         DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
966         int                     scopedist;
967         int                     matchlen;
968 };
969
970 struct ipv6_saddr_dst {
971         const struct in6_addr *addr;
972         int ifindex;
973         int scope;
974         int label;
975         unsigned int prefs;
976 };
977
978 static inline int ipv6_saddr_preferred(int type)
979 {
980         if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
981                     IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
982                 return 1;
983         return 0;
984 }
985
986 static int ipv6_get_saddr_eval(struct net *net,
987                                struct ipv6_saddr_score *score,
988                                struct ipv6_saddr_dst *dst,
989                                int i)
990 {
991         int ret;
992
993         if (i <= score->rule) {
994                 switch (i) {
995                 case IPV6_SADDR_RULE_SCOPE:
996                         ret = score->scopedist;
997                         break;
998                 case IPV6_SADDR_RULE_PREFIX:
999                         ret = score->matchlen;
1000                         break;
1001                 default:
1002                         ret = !!test_bit(i, score->scorebits);
1003                 }
1004                 goto out;
1005         }
1006
1007         switch (i) {
1008         case IPV6_SADDR_RULE_INIT:
1009                 /* Rule 0: remember if hiscore is not ready yet */
1010                 ret = !!score->ifa;
1011                 break;
1012         case IPV6_SADDR_RULE_LOCAL:
1013                 /* Rule 1: Prefer same address */
1014                 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1015                 break;
1016         case IPV6_SADDR_RULE_SCOPE:
1017                 /* Rule 2: Prefer appropriate scope
1018                  *
1019                  *      ret
1020                  *       ^
1021                  *    -1 |  d 15
1022                  *    ---+--+-+---> scope
1023                  *       |
1024                  *       |             d is scope of the destination.
1025                  *  B-d  |  \
1026                  *       |   \      <- smaller scope is better if
1027                  *  B-15 |    \        if scope is enough for destinaion.
1028                  *       |             ret = B - scope (-1 <= scope >= d <= 15).
1029                  * d-C-1 | /
1030                  *       |/         <- greater is better
1031                  *   -C  /             if scope is not enough for destination.
1032                  *      /|             ret = scope - C (-1 <= d < scope <= 15).
1033                  *
1034                  * d - C - 1 < B -15 (for all -1 <= d <= 15).
1035                  * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1036                  * Assume B = 0 and we get C > 29.
1037                  */
1038                 ret = __ipv6_addr_src_scope(score->addr_type);
1039                 if (ret >= dst->scope)
1040                         ret = -ret;
1041                 else
1042                         ret -= 128;     /* 30 is enough */
1043                 score->scopedist = ret;
1044                 break;
1045         case IPV6_SADDR_RULE_PREFERRED:
1046                 /* Rule 3: Avoid deprecated and optimistic addresses */
1047                 ret = ipv6_saddr_preferred(score->addr_type) ||
1048                       !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1049                 break;
1050 #ifdef CONFIG_IPV6_MIP6
1051         case IPV6_SADDR_RULE_HOA:
1052             {
1053                 /* Rule 4: Prefer home address */
1054                 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1055                 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1056                 break;
1057             }
1058 #endif
1059         case IPV6_SADDR_RULE_OIF:
1060                 /* Rule 5: Prefer outgoing interface */
1061                 ret = (!dst->ifindex ||
1062                        dst->ifindex == score->ifa->idev->dev->ifindex);
1063                 break;
1064         case IPV6_SADDR_RULE_LABEL:
1065                 /* Rule 6: Prefer matching label */
1066                 ret = ipv6_addr_label(net,
1067                                       &score->ifa->addr, score->addr_type,
1068                                       score->ifa->idev->dev->ifindex) == dst->label;
1069                 break;
1070 #ifdef CONFIG_IPV6_PRIVACY
1071         case IPV6_SADDR_RULE_PRIVACY:
1072             {
1073                 /* Rule 7: Prefer public address
1074                  * Note: prefer temprary address if use_tempaddr >= 2
1075                  */
1076                 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1077                                 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1078                                 score->ifa->idev->cnf.use_tempaddr >= 2;
1079                 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1080                 break;
1081             }
1082 #endif
1083         case IPV6_SADDR_RULE_ORCHID:
1084                 /* Rule 8-: Prefer ORCHID vs ORCHID or
1085                  *          non-ORCHID vs non-ORCHID
1086                  */
1087                 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1088                         ipv6_addr_orchid(dst->addr));
1089                 break;
1090         case IPV6_SADDR_RULE_PREFIX:
1091                 /* Rule 8: Use longest matching prefix */
1092                 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr,
1093                                                        dst->addr);
1094                 break;
1095         default:
1096                 ret = 0;
1097         }
1098
1099         if (ret)
1100                 __set_bit(i, score->scorebits);
1101         score->rule = i;
1102 out:
1103         return ret;
1104 }
1105
1106 int ipv6_dev_get_saddr(struct net_device *dst_dev,
1107                        const struct in6_addr *daddr, unsigned int prefs,
1108                        struct in6_addr *saddr)
1109 {
1110         struct ipv6_saddr_score scores[2],
1111                                 *score = &scores[0], *hiscore = &scores[1];
1112         struct net *net = dev_net(dst_dev);
1113         struct ipv6_saddr_dst dst;
1114         struct net_device *dev;
1115         int dst_type;
1116
1117         dst_type = __ipv6_addr_type(daddr);
1118         dst.addr = daddr;
1119         dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1120         dst.scope = __ipv6_addr_src_scope(dst_type);
1121         dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1122         dst.prefs = prefs;
1123
1124         hiscore->rule = -1;
1125         hiscore->ifa = NULL;
1126
1127         read_lock(&dev_base_lock);
1128         rcu_read_lock();
1129
1130         for_each_netdev(net, dev) {
1131                 struct inet6_dev *idev;
1132
1133                 /* Candidate Source Address (section 4)
1134                  *  - multicast and link-local destination address,
1135                  *    the set of candidate source address MUST only
1136                  *    include addresses assigned to interfaces
1137                  *    belonging to the same link as the outgoing
1138                  *    interface.
1139                  * (- For site-local destination addresses, the
1140                  *    set of candidate source addresses MUST only
1141                  *    include addresses assigned to interfaces
1142                  *    belonging to the same site as the outgoing
1143                  *    interface.)
1144                  */
1145                 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1146                      dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1147                     dst.ifindex && dev->ifindex != dst.ifindex)
1148                         continue;
1149
1150                 idev = __in6_dev_get(dev);
1151                 if (!idev)
1152                         continue;
1153
1154                 read_lock_bh(&idev->lock);
1155                 for (score->ifa = idev->addr_list; score->ifa; score->ifa = score->ifa->if_next) {
1156                         int i;
1157
1158                         /*
1159                          * - Tentative Address (RFC2462 section 5.4)
1160                          *  - A tentative address is not considered
1161                          *    "assigned to an interface" in the traditional
1162                          *    sense, unless it is also flagged as optimistic.
1163                          * - Candidate Source Address (section 4)
1164                          *  - In any case, anycast addresses, multicast
1165                          *    addresses, and the unspecified address MUST
1166                          *    NOT be included in a candidate set.
1167                          */
1168                         if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1169                             (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1170                                 continue;
1171
1172                         score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1173
1174                         if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1175                                      score->addr_type & IPV6_ADDR_MULTICAST)) {
1176                                 LIMIT_NETDEBUG(KERN_DEBUG
1177                                                "ADDRCONF: unspecified / multicast address "
1178                                                "assigned as unicast address on %s",
1179                                                dev->name);
1180                                 continue;
1181                         }
1182
1183                         score->rule = -1;
1184                         bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1185
1186                         for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1187                                 int minihiscore, miniscore;
1188
1189                                 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1190                                 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1191
1192                                 if (minihiscore > miniscore) {
1193                                         if (i == IPV6_SADDR_RULE_SCOPE &&
1194                                             score->scopedist > 0) {
1195                                                 /*
1196                                                  * special case:
1197                                                  * each remaining entry
1198                                                  * has too small (not enough)
1199                                                  * scope, because ifa entries
1200                                                  * are sorted by their scope
1201                                                  * values.
1202                                                  */
1203                                                 goto try_nextdev;
1204                                         }
1205                                         break;
1206                                 } else if (minihiscore < miniscore) {
1207                                         struct ipv6_saddr_score *tmp;
1208
1209                                         if (hiscore->ifa)
1210                                                 in6_ifa_put(hiscore->ifa);
1211
1212                                         in6_ifa_hold(score->ifa);
1213
1214                                         tmp = hiscore;
1215                                         hiscore = score;
1216                                         score = tmp;
1217
1218                                         /* restore our iterator */
1219                                         score->ifa = hiscore->ifa;
1220
1221                                         break;
1222                                 }
1223                         }
1224                 }
1225 try_nextdev:
1226                 read_unlock_bh(&idev->lock);
1227         }
1228         rcu_read_unlock();
1229         read_unlock(&dev_base_lock);
1230
1231         if (!hiscore->ifa)
1232                 return -EADDRNOTAVAIL;
1233
1234         ipv6_addr_copy(saddr, &hiscore->ifa->addr);
1235         in6_ifa_put(hiscore->ifa);
1236         return 0;
1237 }
1238
1239 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1240
1241 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1242                     unsigned char banned_flags)
1243 {
1244         struct inet6_dev *idev;
1245         int err = -EADDRNOTAVAIL;
1246
1247         rcu_read_lock();
1248         if ((idev = __in6_dev_get(dev)) != NULL) {
1249                 struct inet6_ifaddr *ifp;
1250
1251                 read_lock_bh(&idev->lock);
1252                 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1253                         if (ifp->scope == IFA_LINK && !(ifp->flags & banned_flags)) {
1254                                 ipv6_addr_copy(addr, &ifp->addr);
1255                                 err = 0;
1256                                 break;
1257                         }
1258                 }
1259                 read_unlock_bh(&idev->lock);
1260         }
1261         rcu_read_unlock();
1262         return err;
1263 }
1264
1265 static int ipv6_count_addresses(struct inet6_dev *idev)
1266 {
1267         int cnt = 0;
1268         struct inet6_ifaddr *ifp;
1269
1270         read_lock_bh(&idev->lock);
1271         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1272                 cnt++;
1273         read_unlock_bh(&idev->lock);
1274         return cnt;
1275 }
1276
1277 int ipv6_chk_addr(struct net *net, struct in6_addr *addr,
1278                   struct net_device *dev, int strict)
1279 {
1280         struct inet6_ifaddr * ifp;
1281         u8 hash = ipv6_addr_hash(addr);
1282
1283         read_lock_bh(&addrconf_hash_lock);
1284         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1285                 if (!net_eq(dev_net(ifp->idev->dev), net))
1286                         continue;
1287                 if (ipv6_addr_equal(&ifp->addr, addr) &&
1288                     !(ifp->flags&IFA_F_TENTATIVE)) {
1289                         if (dev == NULL || ifp->idev->dev == dev ||
1290                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1291                                 break;
1292                 }
1293         }
1294         read_unlock_bh(&addrconf_hash_lock);
1295         return ifp != NULL;
1296 }
1297 EXPORT_SYMBOL(ipv6_chk_addr);
1298
1299 static
1300 int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1301                        struct net_device *dev)
1302 {
1303         struct inet6_ifaddr * ifp;
1304         u8 hash = ipv6_addr_hash(addr);
1305
1306         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1307                 if (!net_eq(dev_net(ifp->idev->dev), net))
1308                         continue;
1309                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1310                         if (dev == NULL || ifp->idev->dev == dev)
1311                                 break;
1312                 }
1313         }
1314         return ifp != NULL;
1315 }
1316
1317 int ipv6_chk_prefix(struct in6_addr *addr, struct net_device *dev)
1318 {
1319         struct inet6_dev *idev;
1320         struct inet6_ifaddr *ifa;
1321         int     onlink;
1322
1323         onlink = 0;
1324         rcu_read_lock();
1325         idev = __in6_dev_get(dev);
1326         if (idev) {
1327                 read_lock_bh(&idev->lock);
1328                 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
1329                         onlink = ipv6_prefix_equal(addr, &ifa->addr,
1330                                                    ifa->prefix_len);
1331                         if (onlink)
1332                                 break;
1333                 }
1334                 read_unlock_bh(&idev->lock);
1335         }
1336         rcu_read_unlock();
1337         return onlink;
1338 }
1339
1340 EXPORT_SYMBOL(ipv6_chk_prefix);
1341
1342 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1343                                      struct net_device *dev, int strict)
1344 {
1345         struct inet6_ifaddr * ifp;
1346         u8 hash = ipv6_addr_hash(addr);
1347
1348         read_lock_bh(&addrconf_hash_lock);
1349         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1350                 if (!net_eq(dev_net(ifp->idev->dev), net))
1351                         continue;
1352                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1353                         if (dev == NULL || ifp->idev->dev == dev ||
1354                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1355                                 in6_ifa_hold(ifp);
1356                                 break;
1357                         }
1358                 }
1359         }
1360         read_unlock_bh(&addrconf_hash_lock);
1361
1362         return ifp;
1363 }
1364
1365 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1366 {
1367         const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
1368         const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
1369         __be32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
1370         __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1371         int sk_ipv6only = ipv6_only_sock(sk);
1372         int sk2_ipv6only = inet_v6_ipv6only(sk2);
1373         int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1374         int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1375
1376         if (!sk2_rcv_saddr && !sk_ipv6only)
1377                 return 1;
1378
1379         if (addr_type2 == IPV6_ADDR_ANY &&
1380             !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1381                 return 1;
1382
1383         if (addr_type == IPV6_ADDR_ANY &&
1384             !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1385                 return 1;
1386
1387         if (sk2_rcv_saddr6 &&
1388             ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1389                 return 1;
1390
1391         if (addr_type == IPV6_ADDR_MAPPED &&
1392             !sk2_ipv6only &&
1393             (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1394                 return 1;
1395
1396         return 0;
1397 }
1398
1399 /* Gets referenced address, destroys ifaddr */
1400
1401 static void addrconf_dad_stop(struct inet6_ifaddr *ifp)
1402 {
1403         if (ifp->flags&IFA_F_PERMANENT) {
1404                 spin_lock_bh(&ifp->lock);
1405                 addrconf_del_timer(ifp);
1406                 ifp->flags |= IFA_F_TENTATIVE;
1407                 spin_unlock_bh(&ifp->lock);
1408                 in6_ifa_put(ifp);
1409 #ifdef CONFIG_IPV6_PRIVACY
1410         } else if (ifp->flags&IFA_F_TEMPORARY) {
1411                 struct inet6_ifaddr *ifpub;
1412                 spin_lock_bh(&ifp->lock);
1413                 ifpub = ifp->ifpub;
1414                 if (ifpub) {
1415                         in6_ifa_hold(ifpub);
1416                         spin_unlock_bh(&ifp->lock);
1417                         ipv6_create_tempaddr(ifpub, ifp);
1418                         in6_ifa_put(ifpub);
1419                 } else {
1420                         spin_unlock_bh(&ifp->lock);
1421                 }
1422                 ipv6_del_addr(ifp);
1423 #endif
1424         } else
1425                 ipv6_del_addr(ifp);
1426 }
1427
1428 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1429 {
1430         struct inet6_dev *idev = ifp->idev;
1431         if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1432                 struct in6_addr addr;
1433
1434                 addr.s6_addr32[0] = htonl(0xfe800000);
1435                 addr.s6_addr32[1] = 0;
1436
1437                 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1438                     ipv6_addr_equal(&ifp->addr, &addr)) {
1439                         /* DAD failed for link-local based on MAC address */
1440                         idev->cnf.disable_ipv6 = 1;
1441                 }
1442         }
1443
1444         if (net_ratelimit())
1445                 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1446         addrconf_dad_stop(ifp);
1447 }
1448
1449 /* Join to solicited addr multicast group. */
1450
1451 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1452 {
1453         struct in6_addr maddr;
1454
1455         if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1456                 return;
1457
1458         addrconf_addr_solict_mult(addr, &maddr);
1459         ipv6_dev_mc_inc(dev, &maddr);
1460 }
1461
1462 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1463 {
1464         struct in6_addr maddr;
1465
1466         if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1467                 return;
1468
1469         addrconf_addr_solict_mult(addr, &maddr);
1470         __ipv6_dev_mc_dec(idev, &maddr);
1471 }
1472
1473 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1474 {
1475         struct in6_addr addr;
1476         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1477         if (ipv6_addr_any(&addr))
1478                 return;
1479         ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1480 }
1481
1482 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1483 {
1484         struct in6_addr addr;
1485         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1486         if (ipv6_addr_any(&addr))
1487                 return;
1488         __ipv6_dev_ac_dec(ifp->idev, &addr);
1489 }
1490
1491 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1492 {
1493         if (dev->addr_len != ETH_ALEN)
1494                 return -1;
1495         memcpy(eui, dev->dev_addr, 3);
1496         memcpy(eui + 5, dev->dev_addr + 3, 3);
1497
1498         /*
1499          * The zSeries OSA network cards can be shared among various
1500          * OS instances, but the OSA cards have only one MAC address.
1501          * This leads to duplicate address conflicts in conjunction
1502          * with IPv6 if more than one instance uses the same card.
1503          *
1504          * The driver for these cards can deliver a unique 16-bit
1505          * identifier for each instance sharing the same card.  It is
1506          * placed instead of 0xFFFE in the interface identifier.  The
1507          * "u" bit of the interface identifier is not inverted in this
1508          * case.  Hence the resulting interface identifier has local
1509          * scope according to RFC2373.
1510          */
1511         if (dev->dev_id) {
1512                 eui[3] = (dev->dev_id >> 8) & 0xFF;
1513                 eui[4] = dev->dev_id & 0xFF;
1514         } else {
1515                 eui[3] = 0xFF;
1516                 eui[4] = 0xFE;
1517                 eui[0] ^= 2;
1518         }
1519         return 0;
1520 }
1521
1522 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1523 {
1524         /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1525         if (dev->addr_len != ARCNET_ALEN)
1526                 return -1;
1527         memset(eui, 0, 7);
1528         eui[7] = *(u8*)dev->dev_addr;
1529         return 0;
1530 }
1531
1532 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1533 {
1534         if (dev->addr_len != INFINIBAND_ALEN)
1535                 return -1;
1536         memcpy(eui, dev->dev_addr + 12, 8);
1537         eui[0] |= 2;
1538         return 0;
1539 }
1540
1541 int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1542 {
1543         eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1544                   ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1545                   ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1546                   ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1547                   ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1548                   ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1549         eui[1] = 0;
1550         eui[2] = 0x5E;
1551         eui[3] = 0xFE;
1552         memcpy(eui + 4, &addr, 4);
1553         return 0;
1554 }
1555 EXPORT_SYMBOL(__ipv6_isatap_ifid);
1556
1557 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1558 {
1559         if (dev->priv_flags & IFF_ISATAP)
1560                 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1561         return -1;
1562 }
1563
1564 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1565 {
1566         switch (dev->type) {
1567         case ARPHRD_ETHER:
1568         case ARPHRD_FDDI:
1569         case ARPHRD_IEEE802_TR:
1570                 return addrconf_ifid_eui48(eui, dev);
1571         case ARPHRD_ARCNET:
1572                 return addrconf_ifid_arcnet(eui, dev);
1573         case ARPHRD_INFINIBAND:
1574                 return addrconf_ifid_infiniband(eui, dev);
1575         case ARPHRD_SIT:
1576                 return addrconf_ifid_sit(eui, dev);
1577         }
1578         return -1;
1579 }
1580
1581 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1582 {
1583         int err = -1;
1584         struct inet6_ifaddr *ifp;
1585
1586         read_lock_bh(&idev->lock);
1587         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1588                 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1589                         memcpy(eui, ifp->addr.s6_addr+8, 8);
1590                         err = 0;
1591                         break;
1592                 }
1593         }
1594         read_unlock_bh(&idev->lock);
1595         return err;
1596 }
1597
1598 #ifdef CONFIG_IPV6_PRIVACY
1599 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1600 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1601 {
1602 regen:
1603         get_random_bytes(idev->rndid, sizeof(idev->rndid));
1604         idev->rndid[0] &= ~0x02;
1605
1606         /*
1607          * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1608          * check if generated address is not inappropriate
1609          *
1610          *  - Reserved subnet anycast (RFC 2526)
1611          *      11111101 11....11 1xxxxxxx
1612          *  - ISATAP (RFC4214) 6.1
1613          *      00-00-5E-FE-xx-xx-xx-xx
1614          *  - value 0
1615          *  - XXX: already assigned to an address on the device
1616          */
1617         if (idev->rndid[0] == 0xfd &&
1618             (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1619             (idev->rndid[7]&0x80))
1620                 goto regen;
1621         if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1622                 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1623                         goto regen;
1624                 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1625                         goto regen;
1626         }
1627
1628         return 0;
1629 }
1630
1631 static void ipv6_regen_rndid(unsigned long data)
1632 {
1633         struct inet6_dev *idev = (struct inet6_dev *) data;
1634         unsigned long expires;
1635
1636         rcu_read_lock_bh();
1637         write_lock_bh(&idev->lock);
1638
1639         if (idev->dead)
1640                 goto out;
1641
1642         if (__ipv6_regen_rndid(idev) < 0)
1643                 goto out;
1644
1645         expires = jiffies +
1646                 idev->cnf.temp_prefered_lft * HZ -
1647                 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1648         if (time_before(expires, jiffies)) {
1649                 printk(KERN_WARNING
1650                         "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1651                         idev->dev->name);
1652                 goto out;
1653         }
1654
1655         if (!mod_timer(&idev->regen_timer, expires))
1656                 in6_dev_hold(idev);
1657
1658 out:
1659         write_unlock_bh(&idev->lock);
1660         rcu_read_unlock_bh();
1661         in6_dev_put(idev);
1662 }
1663
1664 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1665         int ret = 0;
1666
1667         if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1668                 ret = __ipv6_regen_rndid(idev);
1669         return ret;
1670 }
1671 #endif
1672
1673 /*
1674  *      Add prefix route.
1675  */
1676
1677 static void
1678 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1679                       unsigned long expires, u32 flags)
1680 {
1681         struct fib6_config cfg = {
1682                 .fc_table = RT6_TABLE_PREFIX,
1683                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1684                 .fc_ifindex = dev->ifindex,
1685                 .fc_expires = expires,
1686                 .fc_dst_len = plen,
1687                 .fc_flags = RTF_UP | flags,
1688                 .fc_nlinfo.nl_net = dev_net(dev),
1689         };
1690
1691         ipv6_addr_copy(&cfg.fc_dst, pfx);
1692
1693         /* Prevent useless cloning on PtP SIT.
1694            This thing is done here expecting that the whole
1695            class of non-broadcast devices need not cloning.
1696          */
1697 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1698         if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1699                 cfg.fc_flags |= RTF_NONEXTHOP;
1700 #endif
1701
1702         ip6_route_add(&cfg);
1703 }
1704
1705 /* Create "default" multicast route to the interface */
1706
1707 static void addrconf_add_mroute(struct net_device *dev)
1708 {
1709         struct fib6_config cfg = {
1710                 .fc_table = RT6_TABLE_LOCAL,
1711                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1712                 .fc_ifindex = dev->ifindex,
1713                 .fc_dst_len = 8,
1714                 .fc_flags = RTF_UP,
1715                 .fc_nlinfo.nl_net = dev_net(dev),
1716         };
1717
1718         ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1719
1720         ip6_route_add(&cfg);
1721 }
1722
1723 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1724 static void sit_route_add(struct net_device *dev)
1725 {
1726         struct fib6_config cfg = {
1727                 .fc_table = RT6_TABLE_MAIN,
1728                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1729                 .fc_ifindex = dev->ifindex,
1730                 .fc_dst_len = 96,
1731                 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1732                 .fc_nlinfo.nl_net = dev_net(dev),
1733         };
1734
1735         /* prefix length - 96 bits "::d.d.d.d" */
1736         ip6_route_add(&cfg);
1737 }
1738 #endif
1739
1740 static void addrconf_add_lroute(struct net_device *dev)
1741 {
1742         struct in6_addr addr;
1743
1744         ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
1745         addrconf_prefix_route(&addr, 64, dev, 0, 0);
1746 }
1747
1748 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1749 {
1750         struct inet6_dev *idev;
1751
1752         ASSERT_RTNL();
1753
1754         if ((idev = ipv6_find_idev(dev)) == NULL)
1755                 return NULL;
1756
1757         /* Add default multicast route */
1758         addrconf_add_mroute(dev);
1759
1760         /* Add link local route */
1761         addrconf_add_lroute(dev);
1762         return idev;
1763 }
1764
1765 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1766 {
1767         struct prefix_info *pinfo;
1768         __u32 valid_lft;
1769         __u32 prefered_lft;
1770         int addr_type;
1771         struct inet6_dev *in6_dev;
1772
1773         pinfo = (struct prefix_info *) opt;
1774
1775         if (len < sizeof(struct prefix_info)) {
1776                 ADBG(("addrconf: prefix option too short\n"));
1777                 return;
1778         }
1779
1780         /*
1781          *      Validation checks ([ADDRCONF], page 19)
1782          */
1783
1784         addr_type = ipv6_addr_type(&pinfo->prefix);
1785
1786         if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1787                 return;
1788
1789         valid_lft = ntohl(pinfo->valid);
1790         prefered_lft = ntohl(pinfo->prefered);
1791
1792         if (prefered_lft > valid_lft) {
1793                 if (net_ratelimit())
1794                         printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1795                 return;
1796         }
1797
1798         in6_dev = in6_dev_get(dev);
1799
1800         if (in6_dev == NULL) {
1801                 if (net_ratelimit())
1802                         printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1803                 return;
1804         }
1805
1806         /*
1807          *      Two things going on here:
1808          *      1) Add routes for on-link prefixes
1809          *      2) Configure prefixes with the auto flag set
1810          */
1811
1812         if (pinfo->onlink) {
1813                 struct rt6_info *rt;
1814                 unsigned long rt_expires;
1815
1816                 /* Avoid arithmetic overflow. Really, we could
1817                  * save rt_expires in seconds, likely valid_lft,
1818                  * but it would require division in fib gc, that it
1819                  * not good.
1820                  */
1821                 if (HZ > USER_HZ)
1822                         rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
1823                 else
1824                         rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
1825
1826                 if (addrconf_finite_timeout(rt_expires))
1827                         rt_expires *= HZ;
1828
1829                 rt = rt6_lookup(dev_net(dev), &pinfo->prefix, NULL,
1830                                 dev->ifindex, 1);
1831
1832                 if (rt && addrconf_is_prefix_route(rt)) {
1833                         /* Autoconf prefix route */
1834                         if (valid_lft == 0) {
1835                                 ip6_del_rt(rt);
1836                                 rt = NULL;
1837                         } else if (addrconf_finite_timeout(rt_expires)) {
1838                                 /* not infinity */
1839                                 rt->rt6i_expires = jiffies + rt_expires;
1840                                 rt->rt6i_flags |= RTF_EXPIRES;
1841                         } else {
1842                                 rt->rt6i_flags &= ~RTF_EXPIRES;
1843                                 rt->rt6i_expires = 0;
1844                         }
1845                 } else if (valid_lft) {
1846                         clock_t expires = 0;
1847                         int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
1848                         if (addrconf_finite_timeout(rt_expires)) {
1849                                 /* not infinity */
1850                                 flags |= RTF_EXPIRES;
1851                                 expires = jiffies_to_clock_t(rt_expires);
1852                         }
1853                         addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1854                                               dev, expires, flags);
1855                 }
1856                 if (rt)
1857                         dst_release(&rt->u.dst);
1858         }
1859
1860         /* Try to figure out our local address for this prefix */
1861
1862         if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1863                 struct inet6_ifaddr * ifp;
1864                 struct in6_addr addr;
1865                 int create = 0, update_lft = 0;
1866                 struct net *net = dev_net(dev);
1867
1868                 if (pinfo->prefix_len == 64) {
1869                         memcpy(&addr, &pinfo->prefix, 8);
1870                         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1871                             ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1872                                 in6_dev_put(in6_dev);
1873                                 return;
1874                         }
1875                         goto ok;
1876                 }
1877                 if (net_ratelimit())
1878                         printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1879                                pinfo->prefix_len);
1880                 in6_dev_put(in6_dev);
1881                 return;
1882
1883 ok:
1884
1885                 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1886
1887                 if (ifp == NULL && valid_lft) {
1888                         int max_addresses = in6_dev->cnf.max_addresses;
1889                         u32 addr_flags = 0;
1890
1891 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1892                         if (in6_dev->cnf.optimistic_dad &&
1893                             !net->ipv6.devconf_all->forwarding)
1894                                 addr_flags = IFA_F_OPTIMISTIC;
1895 #endif
1896
1897                         /* Do not allow to create too much of autoconfigured
1898                          * addresses; this would be too easy way to crash kernel.
1899                          */
1900                         if (!max_addresses ||
1901                             ipv6_count_addresses(in6_dev) < max_addresses)
1902                                 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1903                                                     addr_type&IPV6_ADDR_SCOPE_MASK,
1904                                                     addr_flags);
1905
1906                         if (!ifp || IS_ERR(ifp)) {
1907                                 in6_dev_put(in6_dev);
1908                                 return;
1909                         }
1910
1911                         update_lft = create = 1;
1912                         ifp->cstamp = jiffies;
1913                         addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1914                 }
1915
1916                 if (ifp) {
1917                         int flags;
1918                         unsigned long now;
1919 #ifdef CONFIG_IPV6_PRIVACY
1920                         struct inet6_ifaddr *ift;
1921 #endif
1922                         u32 stored_lft;
1923
1924                         /* update lifetime (RFC2462 5.5.3 e) */
1925                         spin_lock(&ifp->lock);
1926                         now = jiffies;
1927                         if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1928                                 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1929                         else
1930                                 stored_lft = 0;
1931                         if (!update_lft && stored_lft) {
1932                                 if (valid_lft > MIN_VALID_LIFETIME ||
1933                                     valid_lft > stored_lft)
1934                                         update_lft = 1;
1935                                 else if (stored_lft <= MIN_VALID_LIFETIME) {
1936                                         /* valid_lft <= stored_lft is always true */
1937                                         /* XXX: IPsec */
1938                                         update_lft = 0;
1939                                 } else {
1940                                         valid_lft = MIN_VALID_LIFETIME;
1941                                         if (valid_lft < prefered_lft)
1942                                                 prefered_lft = valid_lft;
1943                                         update_lft = 1;
1944                                 }
1945                         }
1946
1947                         if (update_lft) {
1948                                 ifp->valid_lft = valid_lft;
1949                                 ifp->prefered_lft = prefered_lft;
1950                                 ifp->tstamp = now;
1951                                 flags = ifp->flags;
1952                                 ifp->flags &= ~IFA_F_DEPRECATED;
1953                                 spin_unlock(&ifp->lock);
1954
1955                                 if (!(flags&IFA_F_TENTATIVE))
1956                                         ipv6_ifa_notify(0, ifp);
1957                         } else
1958                                 spin_unlock(&ifp->lock);
1959
1960 #ifdef CONFIG_IPV6_PRIVACY
1961                         read_lock_bh(&in6_dev->lock);
1962                         /* update all temporary addresses in the list */
1963                         for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1964                                 /*
1965                                  * When adjusting the lifetimes of an existing
1966                                  * temporary address, only lower the lifetimes.
1967                                  * Implementations must not increase the
1968                                  * lifetimes of an existing temporary address
1969                                  * when processing a Prefix Information Option.
1970                                  */
1971                                 if (ifp != ift->ifpub)
1972                                         continue;
1973
1974                                 spin_lock(&ift->lock);
1975                                 flags = ift->flags;
1976                                 if (ift->valid_lft > valid_lft &&
1977                                     ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1978                                         ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1979                                 if (ift->prefered_lft > prefered_lft &&
1980                                     ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1981                                         ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1982                                 spin_unlock(&ift->lock);
1983                                 if (!(flags&IFA_F_TENTATIVE))
1984                                         ipv6_ifa_notify(0, ift);
1985                         }
1986
1987                         if (create && in6_dev->cnf.use_tempaddr > 0) {
1988                                 /*
1989                                  * When a new public address is created as described in [ADDRCONF],
1990                                  * also create a new temporary address.
1991                                  */
1992                                 read_unlock_bh(&in6_dev->lock);
1993                                 ipv6_create_tempaddr(ifp, NULL);
1994                         } else {
1995                                 read_unlock_bh(&in6_dev->lock);
1996                         }
1997 #endif
1998                         in6_ifa_put(ifp);
1999                         addrconf_verify(0);
2000                 }
2001         }
2002         inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2003         in6_dev_put(in6_dev);
2004 }
2005
2006 /*
2007  *      Set destination address.
2008  *      Special case for SIT interfaces where we create a new "virtual"
2009  *      device.
2010  */
2011 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2012 {
2013         struct in6_ifreq ireq;
2014         struct net_device *dev;
2015         int err = -EINVAL;
2016
2017         rtnl_lock();
2018
2019         err = -EFAULT;
2020         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2021                 goto err_exit;
2022
2023         dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2024
2025         err = -ENODEV;
2026         if (dev == NULL)
2027                 goto err_exit;
2028
2029 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2030         if (dev->type == ARPHRD_SIT) {
2031                 struct ifreq ifr;
2032                 mm_segment_t    oldfs;
2033                 struct ip_tunnel_parm p;
2034
2035                 err = -EADDRNOTAVAIL;
2036                 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2037                         goto err_exit;
2038
2039                 memset(&p, 0, sizeof(p));
2040                 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2041                 p.iph.saddr = 0;
2042                 p.iph.version = 4;
2043                 p.iph.ihl = 5;
2044                 p.iph.protocol = IPPROTO_IPV6;
2045                 p.iph.ttl = 64;
2046                 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2047
2048                 oldfs = get_fs(); set_fs(KERNEL_DS);
2049                 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2050                 set_fs(oldfs);
2051
2052                 if (err == 0) {
2053                         err = -ENOBUFS;
2054                         dev = __dev_get_by_name(net, p.name);
2055                         if (!dev)
2056                                 goto err_exit;
2057                         err = dev_open(dev);
2058                 }
2059         }
2060 #endif
2061
2062 err_exit:
2063         rtnl_unlock();
2064         return err;
2065 }
2066
2067 /*
2068  *      Manual configuration of address on an interface
2069  */
2070 static int inet6_addr_add(struct net *net, int ifindex, struct in6_addr *pfx,
2071                           unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
2072                           __u32 valid_lft)
2073 {
2074         struct inet6_ifaddr *ifp;
2075         struct inet6_dev *idev;
2076         struct net_device *dev;
2077         int scope;
2078         u32 flags;
2079         clock_t expires;
2080         unsigned long timeout;
2081
2082         ASSERT_RTNL();
2083
2084         if (plen > 128)
2085                 return -EINVAL;
2086
2087         /* check the lifetime */
2088         if (!valid_lft || prefered_lft > valid_lft)
2089                 return -EINVAL;
2090
2091         dev = __dev_get_by_index(net, ifindex);
2092         if (!dev)
2093                 return -ENODEV;
2094
2095         if ((idev = addrconf_add_dev(dev)) == NULL)
2096                 return -ENOBUFS;
2097
2098         scope = ipv6_addr_scope(pfx);
2099
2100         timeout = addrconf_timeout_fixup(valid_lft, HZ);
2101         if (addrconf_finite_timeout(timeout)) {
2102                 expires = jiffies_to_clock_t(timeout * HZ);
2103                 valid_lft = timeout;
2104                 flags = RTF_EXPIRES;
2105         } else {
2106                 expires = 0;
2107                 flags = 0;
2108                 ifa_flags |= IFA_F_PERMANENT;
2109         }
2110
2111         timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2112         if (addrconf_finite_timeout(timeout)) {
2113                 if (timeout == 0)
2114                         ifa_flags |= IFA_F_DEPRECATED;
2115                 prefered_lft = timeout;
2116         }
2117
2118         ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2119
2120         if (!IS_ERR(ifp)) {
2121                 spin_lock_bh(&ifp->lock);
2122                 ifp->valid_lft = valid_lft;
2123                 ifp->prefered_lft = prefered_lft;
2124                 ifp->tstamp = jiffies;
2125                 spin_unlock_bh(&ifp->lock);
2126
2127                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2128                                       expires, flags);
2129                 /*
2130                  * Note that section 3.1 of RFC 4429 indicates
2131                  * that the Optimistic flag should not be set for
2132                  * manually configured addresses
2133                  */
2134                 addrconf_dad_start(ifp, 0);
2135                 in6_ifa_put(ifp);
2136                 addrconf_verify(0);
2137                 return 0;
2138         }
2139
2140         return PTR_ERR(ifp);
2141 }
2142
2143 static int inet6_addr_del(struct net *net, int ifindex, struct in6_addr *pfx,
2144                           unsigned int plen)
2145 {
2146         struct inet6_ifaddr *ifp;
2147         struct inet6_dev *idev;
2148         struct net_device *dev;
2149
2150         if (plen > 128)
2151                 return -EINVAL;
2152
2153         dev = __dev_get_by_index(net, ifindex);
2154         if (!dev)
2155                 return -ENODEV;
2156
2157         if ((idev = __in6_dev_get(dev)) == NULL)
2158                 return -ENXIO;
2159
2160         read_lock_bh(&idev->lock);
2161         for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
2162                 if (ifp->prefix_len == plen &&
2163                     ipv6_addr_equal(pfx, &ifp->addr)) {
2164                         in6_ifa_hold(ifp);
2165                         read_unlock_bh(&idev->lock);
2166
2167                         ipv6_del_addr(ifp);
2168
2169                         /* If the last address is deleted administratively,
2170                            disable IPv6 on this interface.
2171                          */
2172                         if (idev->addr_list == NULL)
2173                                 addrconf_ifdown(idev->dev, 1);
2174                         return 0;
2175                 }
2176         }
2177         read_unlock_bh(&idev->lock);
2178         return -EADDRNOTAVAIL;
2179 }
2180
2181
2182 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2183 {
2184         struct in6_ifreq ireq;
2185         int err;
2186
2187         if (!capable(CAP_NET_ADMIN))
2188                 return -EPERM;
2189
2190         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2191                 return -EFAULT;
2192
2193         rtnl_lock();
2194         err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2195                              ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2196                              INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2197         rtnl_unlock();
2198         return err;
2199 }
2200
2201 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2202 {
2203         struct in6_ifreq ireq;
2204         int err;
2205
2206         if (!capable(CAP_NET_ADMIN))
2207                 return -EPERM;
2208
2209         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2210                 return -EFAULT;
2211
2212         rtnl_lock();
2213         err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2214                              ireq.ifr6_prefixlen);
2215         rtnl_unlock();
2216         return err;
2217 }
2218
2219 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2220 static void sit_add_v4_addrs(struct inet6_dev *idev)
2221 {
2222         struct inet6_ifaddr * ifp;
2223         struct in6_addr addr;
2224         struct net_device *dev;
2225         struct net *net = dev_net(idev->dev);
2226         int scope;
2227
2228         ASSERT_RTNL();
2229
2230         memset(&addr, 0, sizeof(struct in6_addr));
2231         memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2232
2233         if (idev->dev->flags&IFF_POINTOPOINT) {
2234                 addr.s6_addr32[0] = htonl(0xfe800000);
2235                 scope = IFA_LINK;
2236         } else {
2237                 scope = IPV6_ADDR_COMPATv4;
2238         }
2239
2240         if (addr.s6_addr32[3]) {
2241                 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
2242                 if (!IS_ERR(ifp)) {
2243                         spin_lock_bh(&ifp->lock);
2244                         ifp->flags &= ~IFA_F_TENTATIVE;
2245                         spin_unlock_bh(&ifp->lock);
2246                         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2247                         in6_ifa_put(ifp);
2248                 }
2249                 return;
2250         }
2251
2252         for_each_netdev(net, dev) {
2253                 struct in_device * in_dev = __in_dev_get_rtnl(dev);
2254                 if (in_dev && (dev->flags & IFF_UP)) {
2255                         struct in_ifaddr * ifa;
2256
2257                         int flag = scope;
2258
2259                         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2260                                 int plen;
2261
2262                                 addr.s6_addr32[3] = ifa->ifa_local;
2263
2264                                 if (ifa->ifa_scope == RT_SCOPE_LINK)
2265                                         continue;
2266                                 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2267                                         if (idev->dev->flags&IFF_POINTOPOINT)
2268                                                 continue;
2269                                         flag |= IFA_HOST;
2270                                 }
2271                                 if (idev->dev->flags&IFF_POINTOPOINT)
2272                                         plen = 64;
2273                                 else
2274                                         plen = 96;
2275
2276                                 ifp = ipv6_add_addr(idev, &addr, plen, flag,
2277                                                     IFA_F_PERMANENT);
2278                                 if (!IS_ERR(ifp)) {
2279                                         spin_lock_bh(&ifp->lock);
2280                                         ifp->flags &= ~IFA_F_TENTATIVE;
2281                                         spin_unlock_bh(&ifp->lock);
2282                                         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2283                                         in6_ifa_put(ifp);
2284                                 }
2285                         }
2286                 }
2287         }
2288 }
2289 #endif
2290
2291 static void init_loopback(struct net_device *dev)
2292 {
2293         struct inet6_dev  *idev;
2294         struct inet6_ifaddr * ifp;
2295
2296         /* ::1 */
2297
2298         ASSERT_RTNL();
2299
2300         if ((idev = ipv6_find_idev(dev)) == NULL) {
2301                 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2302                 return;
2303         }
2304
2305         ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
2306         if (!IS_ERR(ifp)) {
2307                 spin_lock_bh(&ifp->lock);
2308                 ifp->flags &= ~IFA_F_TENTATIVE;
2309                 spin_unlock_bh(&ifp->lock);
2310                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2311                 in6_ifa_put(ifp);
2312         }
2313 }
2314
2315 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2316 {
2317         struct inet6_ifaddr * ifp;
2318         u32 addr_flags = IFA_F_PERMANENT;
2319
2320 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2321         if (idev->cnf.optimistic_dad &&
2322             !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2323                 addr_flags |= IFA_F_OPTIMISTIC;
2324 #endif
2325
2326
2327         ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2328         if (!IS_ERR(ifp)) {
2329                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2330                 addrconf_dad_start(ifp, 0);
2331                 in6_ifa_put(ifp);
2332         }
2333 }
2334
2335 static void addrconf_dev_config(struct net_device *dev)
2336 {
2337         struct in6_addr addr;
2338         struct inet6_dev    * idev;
2339
2340         ASSERT_RTNL();
2341
2342         if ((dev->type != ARPHRD_ETHER) &&
2343             (dev->type != ARPHRD_FDDI) &&
2344             (dev->type != ARPHRD_IEEE802_TR) &&
2345             (dev->type != ARPHRD_ARCNET) &&
2346             (dev->type != ARPHRD_INFINIBAND)) {
2347                 /* Alas, we support only Ethernet autoconfiguration. */
2348                 return;
2349         }
2350
2351         idev = addrconf_add_dev(dev);
2352         if (idev == NULL)
2353                 return;
2354
2355         memset(&addr, 0, sizeof(struct in6_addr));
2356         addr.s6_addr32[0] = htonl(0xFE800000);
2357
2358         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2359                 addrconf_add_linklocal(idev, &addr);
2360 }
2361
2362 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2363 static void addrconf_sit_config(struct net_device *dev)
2364 {
2365         struct inet6_dev *idev;
2366
2367         ASSERT_RTNL();
2368
2369         /*
2370          * Configure the tunnel with one of our IPv4
2371          * addresses... we should configure all of
2372          * our v4 addrs in the tunnel
2373          */
2374
2375         if ((idev = ipv6_find_idev(dev)) == NULL) {
2376                 printk(KERN_DEBUG "init sit: add_dev failed\n");
2377                 return;
2378         }
2379
2380         if (dev->priv_flags & IFF_ISATAP) {
2381                 struct in6_addr addr;
2382
2383                 ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
2384                 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2385                 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2386                         addrconf_add_linklocal(idev, &addr);
2387                 return;
2388         }
2389
2390         sit_add_v4_addrs(idev);
2391
2392         if (dev->flags&IFF_POINTOPOINT) {
2393                 addrconf_add_mroute(dev);
2394                 addrconf_add_lroute(dev);
2395         } else
2396                 sit_route_add(dev);
2397 }
2398 #endif
2399
2400 static inline int
2401 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2402 {
2403         struct in6_addr lladdr;
2404
2405         if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2406                 addrconf_add_linklocal(idev, &lladdr);
2407                 return 0;
2408         }
2409         return -1;
2410 }
2411
2412 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2413 {
2414         struct net_device *link_dev;
2415         struct net *net = dev_net(idev->dev);
2416
2417         /* first try to inherit the link-local address from the link device */
2418         if (idev->dev->iflink &&
2419             (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
2420                 if (!ipv6_inherit_linklocal(idev, link_dev))
2421                         return;
2422         }
2423         /* then try to inherit it from any device */
2424         for_each_netdev(net, link_dev) {
2425                 if (!ipv6_inherit_linklocal(idev, link_dev))
2426                         return;
2427         }
2428         printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2429 }
2430
2431 /*
2432  * Autoconfigure tunnel with a link-local address so routing protocols,
2433  * DHCPv6, MLD etc. can be run over the virtual link
2434  */
2435
2436 static void addrconf_ip6_tnl_config(struct net_device *dev)
2437 {
2438         struct inet6_dev *idev;
2439
2440         ASSERT_RTNL();
2441
2442         if ((idev = addrconf_add_dev(dev)) == NULL) {
2443                 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2444                 return;
2445         }
2446         ip6_tnl_add_linklocal(idev);
2447 }
2448
2449 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2450                            void * data)
2451 {
2452         struct net_device *dev = (struct net_device *) data;
2453         struct inet6_dev *idev = __in6_dev_get(dev);
2454         int run_pending = 0;
2455         int err;
2456
2457         switch(event) {
2458         case NETDEV_REGISTER:
2459                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2460                         idev = ipv6_add_dev(dev);
2461                         if (!idev)
2462                                 return notifier_from_errno(-ENOMEM);
2463                 }
2464                 break;
2465         case NETDEV_UP:
2466         case NETDEV_CHANGE:
2467                 if (dev->flags & IFF_SLAVE)
2468                         break;
2469
2470                 if (event == NETDEV_UP) {
2471                         if (!addrconf_qdisc_ok(dev)) {
2472                                 /* device is not ready yet. */
2473                                 printk(KERN_INFO
2474                                         "ADDRCONF(NETDEV_UP): %s: "
2475                                         "link is not ready\n",
2476                                         dev->name);
2477                                 break;
2478                         }
2479
2480                         if (!idev && dev->mtu >= IPV6_MIN_MTU)
2481                                 idev = ipv6_add_dev(dev);
2482
2483                         if (idev)
2484                                 idev->if_flags |= IF_READY;
2485                 } else {
2486                         if (!addrconf_qdisc_ok(dev)) {
2487                                 /* device is still not ready. */
2488                                 break;
2489                         }
2490
2491                         if (idev) {
2492                                 if (idev->if_flags & IF_READY) {
2493                                         /* device is already configured. */
2494                                         break;
2495                                 }
2496                                 idev->if_flags |= IF_READY;
2497                         }
2498
2499                         printk(KERN_INFO
2500                                         "ADDRCONF(NETDEV_CHANGE): %s: "
2501                                         "link becomes ready\n",
2502                                         dev->name);
2503
2504                         run_pending = 1;
2505                 }
2506
2507                 switch(dev->type) {
2508 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2509                 case ARPHRD_SIT:
2510                         addrconf_sit_config(dev);
2511                         break;
2512 #endif
2513                 case ARPHRD_TUNNEL6:
2514                         addrconf_ip6_tnl_config(dev);
2515                         break;
2516                 case ARPHRD_LOOPBACK:
2517                         init_loopback(dev);
2518                         break;
2519
2520                 default:
2521                         addrconf_dev_config(dev);
2522                         break;
2523                 }
2524                 if (idev) {
2525                         if (run_pending)
2526                                 addrconf_dad_run(idev);
2527
2528                         /* If the MTU changed during the interface down, when the
2529                            interface up, the changed MTU must be reflected in the
2530                            idev as well as routers.
2531                          */
2532                         if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2533                                 rt6_mtu_change(dev, dev->mtu);
2534                                 idev->cnf.mtu6 = dev->mtu;
2535                         }
2536                         idev->tstamp = jiffies;
2537                         inet6_ifinfo_notify(RTM_NEWLINK, idev);
2538                         /* If the changed mtu during down is lower than IPV6_MIN_MTU
2539                            stop IPv6 on this interface.
2540                          */
2541                         if (dev->mtu < IPV6_MIN_MTU)
2542                                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2543                 }
2544                 break;
2545
2546         case NETDEV_CHANGEMTU:
2547                 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2548                         rt6_mtu_change(dev, dev->mtu);
2549                         idev->cnf.mtu6 = dev->mtu;
2550                         break;
2551                 }
2552
2553                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2554                         idev = ipv6_add_dev(dev);
2555                         if (idev)
2556                                 break;
2557                 }
2558
2559                 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2560
2561         case NETDEV_DOWN:
2562         case NETDEV_UNREGISTER:
2563                 /*
2564                  *      Remove all addresses from this interface.
2565                  */
2566                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2567                 break;
2568
2569         case NETDEV_CHANGENAME:
2570                 if (idev) {
2571                         snmp6_unregister_dev(idev);
2572                         addrconf_sysctl_unregister(idev);
2573                         addrconf_sysctl_register(idev);
2574                         err = snmp6_register_dev(idev);
2575                         if (err)
2576                                 return notifier_from_errno(err);
2577                 }
2578                 break;
2579         }
2580
2581         return NOTIFY_OK;
2582 }
2583
2584 /*
2585  *      addrconf module should be notified of a device going up
2586  */
2587 static struct notifier_block ipv6_dev_notf = {
2588         .notifier_call = addrconf_notify,
2589         .priority = 0
2590 };
2591
2592 static int addrconf_ifdown(struct net_device *dev, int how)
2593 {
2594         struct inet6_dev *idev;
2595         struct inet6_ifaddr *ifa, **bifa;
2596         struct net *net = dev_net(dev);
2597         int i;
2598
2599         ASSERT_RTNL();
2600
2601         if ((dev->flags & IFF_LOOPBACK) && how == 1)
2602                 how = 0;
2603
2604         rt6_ifdown(net, dev);
2605         neigh_ifdown(&nd_tbl, dev);
2606
2607         idev = __in6_dev_get(dev);
2608         if (idev == NULL)
2609                 return -ENODEV;
2610
2611         /* Step 1: remove reference to ipv6 device from parent device.
2612                    Do not dev_put!
2613          */
2614         if (how) {
2615                 idev->dead = 1;
2616
2617                 /* protected by rtnl_lock */
2618                 rcu_assign_pointer(dev->ip6_ptr, NULL);
2619
2620                 /* Step 1.5: remove snmp6 entry */
2621                 snmp6_unregister_dev(idev);
2622
2623         }
2624
2625         /* Step 2: clear hash table */
2626         for (i=0; i<IN6_ADDR_HSIZE; i++) {
2627                 bifa = &inet6_addr_lst[i];
2628
2629                 write_lock_bh(&addrconf_hash_lock);
2630                 while ((ifa = *bifa) != NULL) {
2631                         if (ifa->idev == idev) {
2632                                 *bifa = ifa->lst_next;
2633                                 ifa->lst_next = NULL;
2634                                 addrconf_del_timer(ifa);
2635                                 in6_ifa_put(ifa);
2636                                 continue;
2637                         }
2638                         bifa = &ifa->lst_next;
2639                 }
2640                 write_unlock_bh(&addrconf_hash_lock);
2641         }
2642
2643         write_lock_bh(&idev->lock);
2644
2645         /* Step 3: clear flags for stateless addrconf */
2646         if (!how)
2647                 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2648
2649         /* Step 4: clear address list */
2650 #ifdef CONFIG_IPV6_PRIVACY
2651         if (how && del_timer(&idev->regen_timer))
2652                 in6_dev_put(idev);
2653
2654         /* clear tempaddr list */
2655         while ((ifa = idev->tempaddr_list) != NULL) {
2656                 idev->tempaddr_list = ifa->tmp_next;
2657                 ifa->tmp_next = NULL;
2658                 ifa->dead = 1;
2659                 write_unlock_bh(&idev->lock);
2660                 spin_lock_bh(&ifa->lock);
2661
2662                 if (ifa->ifpub) {
2663                         in6_ifa_put(ifa->ifpub);
2664                         ifa->ifpub = NULL;
2665                 }
2666                 spin_unlock_bh(&ifa->lock);
2667                 in6_ifa_put(ifa);
2668                 write_lock_bh(&idev->lock);
2669         }
2670 #endif
2671         while ((ifa = idev->addr_list) != NULL) {
2672                 idev->addr_list = ifa->if_next;
2673                 ifa->if_next = NULL;
2674                 ifa->dead = 1;
2675                 addrconf_del_timer(ifa);
2676                 write_unlock_bh(&idev->lock);
2677
2678                 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2679                 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2680                 in6_ifa_put(ifa);
2681
2682                 write_lock_bh(&idev->lock);
2683         }
2684         write_unlock_bh(&idev->lock);
2685
2686         /* Step 5: Discard multicast list */
2687
2688         if (how)
2689                 ipv6_mc_destroy_dev(idev);
2690         else
2691                 ipv6_mc_down(idev);
2692
2693         idev->tstamp = jiffies;
2694
2695         /* Shot the device (if unregistered) */
2696
2697         if (how) {
2698                 addrconf_sysctl_unregister(idev);
2699                 neigh_parms_release(&nd_tbl, idev->nd_parms);
2700                 neigh_ifdown(&nd_tbl, dev);
2701                 in6_dev_put(idev);
2702         }
2703         return 0;
2704 }
2705
2706 static void addrconf_rs_timer(unsigned long data)
2707 {
2708         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2709
2710         if (ifp->idev->cnf.forwarding)
2711                 goto out;
2712
2713         if (ifp->idev->if_flags & IF_RA_RCVD) {
2714                 /*
2715                  *      Announcement received after solicitation
2716                  *      was sent
2717                  */
2718                 goto out;
2719         }
2720
2721         spin_lock(&ifp->lock);
2722         if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2723                 /* The wait after the last probe can be shorter */
2724                 addrconf_mod_timer(ifp, AC_RS,
2725                                    (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2726                                    ifp->idev->cnf.rtr_solicit_delay :
2727                                    ifp->idev->cnf.rtr_solicit_interval);
2728                 spin_unlock(&ifp->lock);
2729
2730                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2731         } else {
2732                 spin_unlock(&ifp->lock);
2733                 /*
2734                  * Note: we do not support deprecated "all on-link"
2735                  * assumption any longer.
2736                  */
2737                 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2738                        ifp->idev->dev->name);
2739         }
2740
2741 out:
2742         in6_ifa_put(ifp);
2743 }
2744
2745 /*
2746  *      Duplicate Address Detection
2747  */
2748 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2749 {
2750         unsigned long rand_num;
2751         struct inet6_dev *idev = ifp->idev;
2752
2753         if (ifp->flags & IFA_F_OPTIMISTIC)
2754                 rand_num = 0;
2755         else
2756                 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2757
2758         ifp->probes = idev->cnf.dad_transmits;
2759         addrconf_mod_timer(ifp, AC_DAD, rand_num);
2760 }
2761
2762 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2763 {
2764         struct inet6_dev *idev = ifp->idev;
2765         struct net_device *dev = idev->dev;
2766
2767         addrconf_join_solict(dev, &ifp->addr);
2768
2769         net_srandom(ifp->addr.s6_addr32[3]);
2770
2771         read_lock_bh(&idev->lock);
2772         if (ifp->dead)
2773                 goto out;
2774         spin_lock_bh(&ifp->lock);
2775
2776         if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2777             idev->cnf.accept_dad < 1 ||
2778             !(ifp->flags&IFA_F_TENTATIVE) ||
2779             ifp->flags & IFA_F_NODAD) {
2780                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
2781                 spin_unlock_bh(&ifp->lock);
2782                 read_unlock_bh(&idev->lock);
2783
2784                 addrconf_dad_completed(ifp);
2785                 return;
2786         }
2787
2788         if (!(idev->if_flags & IF_READY)) {
2789                 spin_unlock_bh(&ifp->lock);
2790                 read_unlock_bh(&idev->lock);
2791                 /*
2792                  * If the defice is not ready:
2793                  * - keep it tentative if it is a permanent address.
2794                  * - otherwise, kill it.
2795                  */
2796                 in6_ifa_hold(ifp);
2797                 addrconf_dad_stop(ifp);
2798                 return;
2799         }
2800
2801         /*
2802          * Optimistic nodes can start receiving
2803          * Frames right away
2804          */
2805         if(ifp->flags & IFA_F_OPTIMISTIC)
2806                 ip6_ins_rt(ifp->rt);
2807
2808         addrconf_dad_kick(ifp);
2809         spin_unlock_bh(&ifp->lock);
2810 out:
2811         read_unlock_bh(&idev->lock);
2812 }
2813
2814 static void addrconf_dad_timer(unsigned long data)
2815 {
2816         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2817         struct inet6_dev *idev = ifp->idev;
2818         struct in6_addr mcaddr;
2819
2820         read_lock_bh(&idev->lock);
2821         if (idev->dead) {
2822                 read_unlock_bh(&idev->lock);
2823                 goto out;
2824         }
2825         if (idev->cnf.accept_dad > 1 && idev->cnf.disable_ipv6) {
2826                 read_unlock_bh(&idev->lock);
2827                 addrconf_dad_failure(ifp);
2828                 return;
2829         }
2830         spin_lock_bh(&ifp->lock);
2831         if (ifp->probes == 0) {
2832                 /*
2833                  * DAD was successful
2834                  */
2835
2836                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
2837                 spin_unlock_bh(&ifp->lock);
2838                 read_unlock_bh(&idev->lock);
2839
2840                 addrconf_dad_completed(ifp);
2841
2842                 goto out;
2843         }
2844
2845         ifp->probes--;
2846         addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2847         spin_unlock_bh(&ifp->lock);
2848         read_unlock_bh(&idev->lock);
2849
2850         /* send a neighbour solicitation for our addr */
2851         addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2852         ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
2853 out:
2854         in6_ifa_put(ifp);
2855 }
2856
2857 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2858 {
2859         struct net_device *     dev = ifp->idev->dev;
2860
2861         /*
2862          *      Configure the address for reception. Now it is valid.
2863          */
2864
2865         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2866
2867         /* If added prefix is link local and forwarding is off,
2868            start sending router solicitations.
2869          */
2870
2871         if (ifp->idev->cnf.forwarding == 0 &&
2872             ifp->idev->cnf.rtr_solicits > 0 &&
2873             (dev->flags&IFF_LOOPBACK) == 0 &&
2874             (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2875                 /*
2876                  *      If a host as already performed a random delay
2877                  *      [...] as part of DAD [...] there is no need
2878                  *      to delay again before sending the first RS
2879                  */
2880                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2881
2882                 spin_lock_bh(&ifp->lock);
2883                 ifp->probes = 1;
2884                 ifp->idev->if_flags |= IF_RS_SENT;
2885                 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2886                 spin_unlock_bh(&ifp->lock);
2887         }
2888 }
2889
2890 static void addrconf_dad_run(struct inet6_dev *idev) {
2891         struct inet6_ifaddr *ifp;
2892
2893         read_lock_bh(&idev->lock);
2894         for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2895                 spin_lock_bh(&ifp->lock);
2896                 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2897                         spin_unlock_bh(&ifp->lock);
2898                         continue;
2899                 }
2900                 spin_unlock_bh(&ifp->lock);
2901                 addrconf_dad_kick(ifp);
2902         }
2903         read_unlock_bh(&idev->lock);
2904 }
2905
2906 #ifdef CONFIG_PROC_FS
2907 struct if6_iter_state {
2908         struct seq_net_private p;
2909         int bucket;
2910 };
2911
2912 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2913 {
2914         struct inet6_ifaddr *ifa = NULL;
2915         struct if6_iter_state *state = seq->private;
2916         struct net *net = seq_file_net(seq);
2917
2918         for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2919                 ifa = inet6_addr_lst[state->bucket];
2920
2921                 while (ifa && !net_eq(dev_net(ifa->idev->dev), net))
2922                         ifa = ifa->lst_next;
2923                 if (ifa)
2924                         break;
2925         }
2926         return ifa;
2927 }
2928
2929 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2930 {
2931         struct if6_iter_state *state = seq->private;
2932         struct net *net = seq_file_net(seq);
2933
2934         ifa = ifa->lst_next;
2935 try_again:
2936         if (ifa) {
2937                 if (!net_eq(dev_net(ifa->idev->dev), net)) {
2938                         ifa = ifa->lst_next;
2939                         goto try_again;
2940                 }
2941         }
2942
2943         if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2944                 ifa = inet6_addr_lst[state->bucket];
2945                 goto try_again;
2946         }
2947
2948         return ifa;
2949 }
2950
2951 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2952 {
2953         struct inet6_ifaddr *ifa = if6_get_first(seq);
2954
2955         if (ifa)
2956                 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2957                         --pos;
2958         return pos ? NULL : ifa;
2959 }
2960
2961 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2962         __acquires(addrconf_hash_lock)
2963 {
2964         read_lock_bh(&addrconf_hash_lock);
2965         return if6_get_idx(seq, *pos);
2966 }
2967
2968 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2969 {
2970         struct inet6_ifaddr *ifa;
2971
2972         ifa = if6_get_next(seq, v);
2973         ++*pos;
2974         return ifa;
2975 }
2976
2977 static void if6_seq_stop(struct seq_file *seq, void *v)
2978         __releases(addrconf_hash_lock)
2979 {
2980         read_unlock_bh(&addrconf_hash_lock);
2981 }
2982
2983 static int if6_seq_show(struct seq_file *seq, void *v)
2984 {
2985         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2986         seq_printf(seq,
2987                    NIP6_SEQFMT " %02x %02x %02x %02x %8s\n",
2988                    NIP6(ifp->addr),
2989                    ifp->idev->dev->ifindex,
2990                    ifp->prefix_len,
2991                    ifp->scope,
2992                    ifp->flags,
2993                    ifp->idev->dev->name);
2994         return 0;
2995 }
2996
2997 static const struct seq_operations if6_seq_ops = {
2998         .start  = if6_seq_start,
2999         .next   = if6_seq_next,
3000         .show   = if6_seq_show,
3001         .stop   = if6_seq_stop,
3002 };
3003
3004 static int if6_seq_open(struct inode *inode, struct file *file)
3005 {
3006         return seq_open_net(inode, file, &if6_seq_ops,
3007                             sizeof(struct if6_iter_state));
3008 }
3009
3010 static const struct file_operations if6_fops = {
3011         .owner          = THIS_MODULE,
3012         .open           = if6_seq_open,
3013         .read           = seq_read,
3014         .llseek         = seq_lseek,
3015         .release        = seq_release_net,
3016 };
3017
3018 static int if6_proc_net_init(struct net *net)
3019 {
3020         if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
3021                 return -ENOMEM;
3022         return 0;
3023 }
3024
3025 static void if6_proc_net_exit(struct net *net)
3026 {
3027        proc_net_remove(net, "if_inet6");
3028 }
3029
3030 static struct pernet_operations if6_proc_net_ops = {
3031        .init = if6_proc_net_init,
3032        .exit = if6_proc_net_exit,
3033 };
3034
3035 int __init if6_proc_init(void)
3036 {
3037         return register_pernet_subsys(&if6_proc_net_ops);
3038 }
3039
3040 void if6_proc_exit(void)
3041 {
3042         unregister_pernet_subsys(&if6_proc_net_ops);
3043 }
3044 #endif  /* CONFIG_PROC_FS */
3045
3046 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3047 /* Check if address is a home address configured on any interface. */
3048 int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr)
3049 {
3050         int ret = 0;
3051         struct inet6_ifaddr * ifp;
3052         u8 hash = ipv6_addr_hash(addr);
3053         read_lock_bh(&addrconf_hash_lock);
3054         for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) {
3055                 if (!net_eq(dev_net(ifp->idev->dev), net))
3056                         continue;
3057                 if (ipv6_addr_equal(&ifp->addr, addr) &&
3058                     (ifp->flags & IFA_F_HOMEADDRESS)) {
3059                         ret = 1;
3060                         break;
3061                 }
3062         }
3063         read_unlock_bh(&addrconf_hash_lock);
3064         return ret;
3065 }
3066 #endif
3067
3068 /*
3069  *      Periodic address status verification
3070  */
3071
3072 static void addrconf_verify(unsigned long foo)
3073 {
3074         struct inet6_ifaddr *ifp;
3075         unsigned long now, next;
3076         int i;
3077
3078         spin_lock_bh(&addrconf_verify_lock);
3079         now = jiffies;
3080         next = now + ADDR_CHECK_FREQUENCY;
3081
3082         del_timer(&addr_chk_timer);
3083
3084         for (i=0; i < IN6_ADDR_HSIZE; i++) {
3085
3086 restart:
3087                 read_lock(&addrconf_hash_lock);
3088                 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
3089                         unsigned long age;
3090 #ifdef CONFIG_IPV6_PRIVACY
3091                         unsigned long regen_advance;
3092 #endif
3093
3094                         if (ifp->flags & IFA_F_PERMANENT)
3095                                 continue;
3096
3097                         spin_lock(&ifp->lock);
3098                         age = (now - ifp->tstamp) / HZ;
3099
3100 #ifdef CONFIG_IPV6_PRIVACY
3101                         regen_advance = ifp->idev->cnf.regen_max_retry *
3102                                         ifp->idev->cnf.dad_transmits *
3103                                         ifp->idev->nd_parms->retrans_time / HZ;
3104 #endif
3105
3106                         if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3107                             age >= ifp->valid_lft) {
3108                                 spin_unlock(&ifp->lock);
3109                                 in6_ifa_hold(ifp);
3110                                 read_unlock(&addrconf_hash_lock);
3111                                 ipv6_del_addr(ifp);
3112                                 goto restart;
3113                         } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3114                                 spin_unlock(&ifp->lock);
3115                                 continue;
3116                         } else if (age >= ifp->prefered_lft) {
3117                                 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
3118                                 int deprecate = 0;
3119
3120                                 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3121                                         deprecate = 1;
3122                                         ifp->flags |= IFA_F_DEPRECATED;
3123                                 }
3124
3125                                 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3126                                         next = ifp->tstamp + ifp->valid_lft * HZ;
3127
3128                                 spin_unlock(&ifp->lock);
3129
3130                                 if (deprecate) {
3131                                         in6_ifa_hold(ifp);
3132                                         read_unlock(&addrconf_hash_lock);
3133
3134                                         ipv6_ifa_notify(0, ifp);
3135                                         in6_ifa_put(ifp);
3136                                         goto restart;
3137                                 }
3138 #ifdef CONFIG_IPV6_PRIVACY
3139                         } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3140                                    !(ifp->flags&IFA_F_TENTATIVE)) {
3141                                 if (age >= ifp->prefered_lft - regen_advance) {
3142                                         struct inet6_ifaddr *ifpub = ifp->ifpub;
3143                                         if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3144                                                 next = ifp->tstamp + ifp->prefered_lft * HZ;
3145                                         if (!ifp->regen_count && ifpub) {
3146                                                 ifp->regen_count++;
3147                                                 in6_ifa_hold(ifp);
3148                                                 in6_ifa_hold(ifpub);
3149                                                 spin_unlock(&ifp->lock);
3150                                                 read_unlock(&addrconf_hash_lock);
3151                                                 spin_lock(&ifpub->lock);
3152                                                 ifpub->regen_count = 0;
3153                                                 spin_unlock(&ifpub->lock);
3154                                                 ipv6_create_tempaddr(ifpub, ifp);
3155                                                 in6_ifa_put(ifpub);
3156                                                 in6_ifa_put(ifp);
3157                                                 goto restart;
3158                                         }
3159                                 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3160                                         next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3161                                 spin_unlock(&ifp->lock);
3162 #endif
3163                         } else {
3164                                 /* ifp->prefered_lft <= ifp->valid_lft */
3165                                 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3166                                         next = ifp->tstamp + ifp->prefered_lft * HZ;
3167                                 spin_unlock(&ifp->lock);
3168                         }
3169                 }
3170                 read_unlock(&addrconf_hash_lock);
3171         }
3172
3173         addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
3174         add_timer(&addr_chk_timer);
3175         spin_unlock_bh(&addrconf_verify_lock);
3176 }
3177
3178 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3179 {
3180         struct in6_addr *pfx = NULL;
3181
3182         if (addr)
3183                 pfx = nla_data(addr);
3184
3185         if (local) {
3186                 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3187                         pfx = NULL;
3188                 else
3189                         pfx = nla_data(local);
3190         }
3191
3192         return pfx;
3193 }
3194
3195 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3196         [IFA_ADDRESS]           = { .len = sizeof(struct in6_addr) },
3197         [IFA_LOCAL]             = { .len = sizeof(struct in6_addr) },
3198         [IFA_CACHEINFO]         = { .len = sizeof(struct ifa_cacheinfo) },
3199 };
3200
3201 static int
3202 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3203 {
3204         struct net *net = sock_net(skb->sk);
3205         struct ifaddrmsg *ifm;
3206         struct nlattr *tb[IFA_MAX+1];
3207         struct in6_addr *pfx;
3208         int err;
3209
3210         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3211         if (err < 0)
3212                 return err;
3213
3214         ifm = nlmsg_data(nlh);
3215         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3216         if (pfx == NULL)
3217                 return -EINVAL;
3218
3219         return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3220 }
3221
3222 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3223                              u32 prefered_lft, u32 valid_lft)
3224 {
3225         u32 flags;
3226         clock_t expires;
3227         unsigned long timeout;
3228
3229         if (!valid_lft || (prefered_lft > valid_lft))
3230                 return -EINVAL;
3231
3232         timeout = addrconf_timeout_fixup(valid_lft, HZ);
3233         if (addrconf_finite_timeout(timeout)) {
3234                 expires = jiffies_to_clock_t(timeout * HZ);
3235                 valid_lft = timeout;
3236                 flags = RTF_EXPIRES;
3237         } else {
3238                 expires = 0;
3239                 flags = 0;
3240                 ifa_flags |= IFA_F_PERMANENT;
3241         }
3242
3243         timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3244         if (addrconf_finite_timeout(timeout)) {
3245                 if (timeout == 0)
3246                         ifa_flags |= IFA_F_DEPRECATED;
3247                 prefered_lft = timeout;
3248         }
3249
3250         spin_lock_bh(&ifp->lock);
3251         ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3252         ifp->tstamp = jiffies;
3253         ifp->valid_lft = valid_lft;
3254         ifp->prefered_lft = prefered_lft;
3255
3256         spin_unlock_bh(&ifp->lock);
3257         if (!(ifp->flags&IFA_F_TENTATIVE))
3258                 ipv6_ifa_notify(0, ifp);
3259
3260         addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3261                               expires, flags);
3262         addrconf_verify(0);
3263
3264         return 0;
3265 }
3266
3267 static int
3268 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3269 {
3270         struct net *net = sock_net(skb->sk);
3271         struct ifaddrmsg *ifm;
3272         struct nlattr *tb[IFA_MAX+1];
3273         struct in6_addr *pfx;
3274         struct inet6_ifaddr *ifa;
3275         struct net_device *dev;
3276         u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3277         u8 ifa_flags;
3278         int err;
3279
3280         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3281         if (err < 0)
3282                 return err;
3283
3284         ifm = nlmsg_data(nlh);
3285         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3286         if (pfx == NULL)
3287                 return -EINVAL;
3288
3289         if (tb[IFA_CACHEINFO]) {
3290                 struct ifa_cacheinfo *ci;
3291
3292                 ci = nla_data(tb[IFA_CACHEINFO]);
3293                 valid_lft = ci->ifa_valid;
3294                 preferred_lft = ci->ifa_prefered;
3295         } else {
3296                 preferred_lft = INFINITY_LIFE_TIME;
3297                 valid_lft = INFINITY_LIFE_TIME;
3298         }
3299
3300         dev =  __dev_get_by_index(net, ifm->ifa_index);
3301         if (dev == NULL)
3302                 return -ENODEV;