452a82ce479681832698f3178b726f9cae6a2a69
[linux-2.6.git] / net / ipv6 / addrconf.c
1 /*
2  *      IPv6 Address [auto]configuration
3  *      Linux INET6 implementation
4  *
5  *      Authors:
6  *      Pedro Roque             <roque@di.fc.ul.pt>
7  *      Alexey Kuznetsov        <kuznet@ms2.inr.ac.ru>
8  *
9  *      $Id: addrconf.c,v 1.69 2001/10/31 21:55:54 davem Exp $
10  *
11  *      This program is free software; you can redistribute it and/or
12  *      modify it under the terms of the GNU General Public License
13  *      as published by the Free Software Foundation; either version
14  *      2 of the License, or (at your option) any later version.
15  */
16
17 /*
18  *      Changes:
19  *
20  *      Janos Farkas                    :       delete timer on ifdown
21  *      <chexum@bankinf.banki.hu>
22  *      Andi Kleen                      :       kill double kfree on module
23  *                                              unload.
24  *      Maciej W. Rozycki               :       FDDI support
25  *      sekiya@USAGI                    :       Don't send too many RS
26  *                                              packets.
27  *      yoshfuji@USAGI                  :       Fixed interval between DAD
28  *                                              packets.
29  *      YOSHIFUJI Hideaki @USAGI        :       improved accuracy of
30  *                                              address validation timer.
31  *      YOSHIFUJI Hideaki @USAGI        :       Privacy Extensions (RFC3041)
32  *                                              support.
33  *      Yuji SEKIYA @USAGI              :       Don't assign a same IPv6
34  *                                              address on a same interface.
35  *      YOSHIFUJI Hideaki @USAGI        :       ARCnet support
36  *      YOSHIFUJI Hideaki @USAGI        :       convert /proc/net/if_inet6 to
37  *                                              seq_file.
38  *      YOSHIFUJI Hideaki @USAGI        :       improved source address
39  *                                              selection; consider scope,
40  *                                              status etc.
41  */
42
43 #include <linux/errno.h>
44 #include <linux/types.h>
45 #include <linux/socket.h>
46 #include <linux/sockios.h>
47 #include <linux/net.h>
48 #include <linux/in6.h>
49 #include <linux/netdevice.h>
50 #include <linux/if_addr.h>
51 #include <linux/if_arp.h>
52 #include <linux/if_arcnet.h>
53 #include <linux/if_infiniband.h>
54 #include <linux/route.h>
55 #include <linux/inetdevice.h>
56 #include <linux/init.h>
57 #ifdef CONFIG_SYSCTL
58 #include <linux/sysctl.h>
59 #endif
60 #include <linux/capability.h>
61 #include <linux/delay.h>
62 #include <linux/notifier.h>
63 #include <linux/string.h>
64
65 #include <net/sock.h>
66 #include <net/snmp.h>
67
68 #include <net/ipv6.h>
69 #include <net/protocol.h>
70 #include <net/ndisc.h>
71 #include <net/ip6_route.h>
72 #include <net/addrconf.h>
73 #include <net/tcp.h>
74 #include <net/ip.h>
75 #include <net/netlink.h>
76 #include <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
85 #include <linux/proc_fs.h>
86 #include <linux/seq_file.h>
87
88 /* Set to 3 to get tracing... */
89 #define ACONF_DEBUG 2
90
91 #if ACONF_DEBUG >= 3
92 #define ADBG(x) printk x
93 #else
94 #define ADBG(x)
95 #endif
96
97 #define INFINITY_LIFE_TIME      0xFFFFFFFF
98 #define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b)))
99
100 #ifdef CONFIG_SYSCTL
101 static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p);
102 static void addrconf_sysctl_unregister(struct ipv6_devconf *p);
103 #endif
104
105 #ifdef CONFIG_IPV6_PRIVACY
106 static int __ipv6_regen_rndid(struct inet6_dev *idev);
107 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
108 static void ipv6_regen_rndid(unsigned long data);
109
110 static int desync_factor = MAX_DESYNC_FACTOR * HZ;
111 #endif
112
113 static int ipv6_count_addresses(struct inet6_dev *idev);
114
115 /*
116  *      Configured unicast address hash table
117  */
118 static struct inet6_ifaddr              *inet6_addr_lst[IN6_ADDR_HSIZE];
119 static DEFINE_RWLOCK(addrconf_hash_lock);
120
121 static void addrconf_verify(unsigned long);
122
123 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
124 static DEFINE_SPINLOCK(addrconf_verify_lock);
125
126 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
127 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
128
129 static int addrconf_ifdown(struct net_device *dev, int how);
130
131 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
132 static void addrconf_dad_timer(unsigned long data);
133 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
134 static void addrconf_dad_run(struct inet6_dev *idev);
135 static void addrconf_rs_timer(unsigned long data);
136 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
137 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
138
139 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
140                                 struct prefix_info *pinfo);
141 static int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev);
142
143 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
144
145 struct ipv6_devconf ipv6_devconf __read_mostly = {
146         .forwarding             = 0,
147         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
148         .mtu6                   = IPV6_MIN_MTU,
149         .accept_ra              = 1,
150         .accept_redirects       = 1,
151         .autoconf               = 1,
152         .force_mld_version      = 0,
153         .dad_transmits          = 1,
154         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
155         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
156         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
157 #ifdef CONFIG_IPV6_PRIVACY
158         .use_tempaddr           = 0,
159         .temp_valid_lft         = TEMP_VALID_LIFETIME,
160         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
161         .regen_max_retry        = REGEN_MAX_RETRY,
162         .max_desync_factor      = MAX_DESYNC_FACTOR,
163 #endif
164         .max_addresses          = IPV6_MAX_ADDRESSES,
165         .accept_ra_defrtr       = 1,
166         .accept_ra_pinfo        = 1,
167 #ifdef CONFIG_IPV6_ROUTER_PREF
168         .accept_ra_rtr_pref     = 1,
169         .rtr_probe_interval     = 60 * HZ,
170 #ifdef CONFIG_IPV6_ROUTE_INFO
171         .accept_ra_rt_info_max_plen = 0,
172 #endif
173 #endif
174         .proxy_ndp              = 0,
175         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
176 };
177
178 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
179         .forwarding             = 0,
180         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
181         .mtu6                   = IPV6_MIN_MTU,
182         .accept_ra              = 1,
183         .accept_redirects       = 1,
184         .autoconf               = 1,
185         .dad_transmits          = 1,
186         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
187         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
188         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
189 #ifdef CONFIG_IPV6_PRIVACY
190         .use_tempaddr           = 0,
191         .temp_valid_lft         = TEMP_VALID_LIFETIME,
192         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
193         .regen_max_retry        = REGEN_MAX_RETRY,
194         .max_desync_factor      = MAX_DESYNC_FACTOR,
195 #endif
196         .max_addresses          = IPV6_MAX_ADDRESSES,
197         .accept_ra_defrtr       = 1,
198         .accept_ra_pinfo        = 1,
199 #ifdef CONFIG_IPV6_ROUTER_PREF
200         .accept_ra_rtr_pref     = 1,
201         .rtr_probe_interval     = 60 * HZ,
202 #ifdef CONFIG_IPV6_ROUTE_INFO
203         .accept_ra_rt_info_max_plen = 0,
204 #endif
205 #endif
206         .proxy_ndp              = 0,
207         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
208 };
209
210 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
211 #if 0
212 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
213 #endif
214 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
215
216 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
217 {
218         if (del_timer(&ifp->timer))
219                 __in6_ifa_put(ifp);
220 }
221
222 enum addrconf_timer_t
223 {
224         AC_NONE,
225         AC_DAD,
226         AC_RS,
227 };
228
229 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
230                                enum addrconf_timer_t what,
231                                unsigned long when)
232 {
233         if (!del_timer(&ifp->timer))
234                 in6_ifa_hold(ifp);
235
236         switch (what) {
237         case AC_DAD:
238                 ifp->timer.function = addrconf_dad_timer;
239                 break;
240         case AC_RS:
241                 ifp->timer.function = addrconf_rs_timer;
242                 break;
243         default:;
244         }
245         ifp->timer.expires = jiffies + when;
246         add_timer(&ifp->timer);
247 }
248
249 /* Nobody refers to this device, we may destroy it. */
250
251 static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
252 {
253         struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
254         kfree(idev);
255 }
256
257 void in6_dev_finish_destroy(struct inet6_dev *idev)
258 {
259         struct net_device *dev = idev->dev;
260         BUG_TRAP(idev->addr_list==NULL);
261         BUG_TRAP(idev->mc_list==NULL);
262 #ifdef NET_REFCNT_DEBUG
263         printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
264 #endif
265         dev_put(dev);
266         if (!idev->dead) {
267                 printk("Freeing alive inet6 device %p\n", idev);
268                 return;
269         }
270         snmp6_free_dev(idev);
271         call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
272 }
273
274 static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
275 {
276         struct inet6_dev *ndev;
277         struct in6_addr maddr;
278
279         ASSERT_RTNL();
280
281         if (dev->mtu < IPV6_MIN_MTU)
282                 return NULL;
283
284         ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
285
286         if (ndev == NULL)
287                 return NULL;
288
289         rwlock_init(&ndev->lock);
290         ndev->dev = dev;
291         memcpy(&ndev->cnf, &ipv6_devconf_dflt, sizeof(ndev->cnf));
292         ndev->cnf.mtu6 = dev->mtu;
293         ndev->cnf.sysctl = NULL;
294         ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
295         if (ndev->nd_parms == NULL) {
296                 kfree(ndev);
297                 return NULL;
298         }
299         /* We refer to the device */
300         dev_hold(dev);
301
302         if (snmp6_alloc_dev(ndev) < 0) {
303                 ADBG((KERN_WARNING
304                         "%s(): cannot allocate memory for statistics; dev=%s.\n",
305                         __FUNCTION__, dev->name));
306                 neigh_parms_release(&nd_tbl, ndev->nd_parms);
307                 ndev->dead = 1;
308                 in6_dev_finish_destroy(ndev);
309                 return NULL;
310         }
311
312         if (snmp6_register_dev(ndev) < 0) {
313                 ADBG((KERN_WARNING
314                         "%s(): cannot create /proc/net/dev_snmp6/%s\n",
315                         __FUNCTION__, dev->name));
316                 neigh_parms_release(&nd_tbl, ndev->nd_parms);
317                 ndev->dead = 1;
318                 in6_dev_finish_destroy(ndev);
319                 return NULL;
320         }
321
322         /* One reference from device.  We must do this before
323          * we invoke __ipv6_regen_rndid().
324          */
325         in6_dev_hold(ndev);
326
327 #ifdef CONFIG_IPV6_PRIVACY
328         init_timer(&ndev->regen_timer);
329         ndev->regen_timer.function = ipv6_regen_rndid;
330         ndev->regen_timer.data = (unsigned long) ndev;
331         if ((dev->flags&IFF_LOOPBACK) ||
332             dev->type == ARPHRD_TUNNEL ||
333 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
334             dev->type == ARPHRD_SIT ||
335 #endif
336             dev->type == ARPHRD_NONE) {
337                 printk(KERN_INFO
338                        "%s: Disabled Privacy Extensions\n",
339                        dev->name);
340                 ndev->cnf.use_tempaddr = -1;
341         } else {
342                 in6_dev_hold(ndev);
343                 ipv6_regen_rndid((unsigned long) ndev);
344         }
345 #endif
346
347         if (netif_running(dev) && netif_carrier_ok(dev))
348                 ndev->if_flags |= IF_READY;
349
350         ipv6_mc_init_dev(ndev);
351         ndev->tstamp = jiffies;
352 #ifdef CONFIG_SYSCTL
353         neigh_sysctl_register(dev, ndev->nd_parms, NET_IPV6,
354                               NET_IPV6_NEIGH, "ipv6",
355                               &ndisc_ifinfo_sysctl_change,
356                               NULL);
357         addrconf_sysctl_register(ndev, &ndev->cnf);
358 #endif
359         /* protected by rtnl_lock */
360         rcu_assign_pointer(dev->ip6_ptr, ndev);
361
362         /* Join all-node multicast group */
363         ipv6_addr_all_nodes(&maddr);
364         ipv6_dev_mc_inc(dev, &maddr);
365
366         return ndev;
367 }
368
369 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
370 {
371         struct inet6_dev *idev;
372
373         ASSERT_RTNL();
374
375         if ((idev = __in6_dev_get(dev)) == NULL) {
376                 if ((idev = ipv6_add_dev(dev)) == NULL)
377                         return NULL;
378         }
379
380         if (dev->flags&IFF_UP)
381                 ipv6_mc_up(idev);
382         return idev;
383 }
384
385 #ifdef CONFIG_SYSCTL
386 static void dev_forward_change(struct inet6_dev *idev)
387 {
388         struct net_device *dev;
389         struct inet6_ifaddr *ifa;
390         struct in6_addr addr;
391
392         if (!idev)
393                 return;
394         dev = idev->dev;
395         if (dev && (dev->flags & IFF_MULTICAST)) {
396                 ipv6_addr_all_routers(&addr);
397
398                 if (idev->cnf.forwarding)
399                         ipv6_dev_mc_inc(dev, &addr);
400                 else
401                         ipv6_dev_mc_dec(dev, &addr);
402         }
403         for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
404                 if (ifa->flags&IFA_F_TENTATIVE)
405                         continue;
406                 if (idev->cnf.forwarding)
407                         addrconf_join_anycast(ifa);
408                 else
409                         addrconf_leave_anycast(ifa);
410         }
411 }
412
413
414 static void addrconf_forward_change(void)
415 {
416         struct net_device *dev;
417         struct inet6_dev *idev;
418
419         read_lock(&dev_base_lock);
420         for (dev=dev_base; dev; dev=dev->next) {
421                 rcu_read_lock();
422                 idev = __in6_dev_get(dev);
423                 if (idev) {
424                         int changed = (!idev->cnf.forwarding) ^ (!ipv6_devconf.forwarding);
425                         idev->cnf.forwarding = ipv6_devconf.forwarding;
426                         if (changed)
427                                 dev_forward_change(idev);
428                 }
429                 rcu_read_unlock();
430         }
431         read_unlock(&dev_base_lock);
432 }
433 #endif
434
435 /* Nobody refers to this ifaddr, destroy it */
436
437 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
438 {
439         BUG_TRAP(ifp->if_next==NULL);
440         BUG_TRAP(ifp->lst_next==NULL);
441 #ifdef NET_REFCNT_DEBUG
442         printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
443 #endif
444
445         in6_dev_put(ifp->idev);
446
447         if (del_timer(&ifp->timer))
448                 printk("Timer is still running, when freeing ifa=%p\n", ifp);
449
450         if (!ifp->dead) {
451                 printk("Freeing alive inet6 address %p\n", ifp);
452                 return;
453         }
454         dst_release(&ifp->rt->u.dst);
455
456         kfree(ifp);
457 }
458
459 static void
460 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
461 {
462         struct inet6_ifaddr *ifa, **ifap;
463         int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
464
465         /*
466          * Each device address list is sorted in order of scope -
467          * global before linklocal.
468          */
469         for (ifap = &idev->addr_list; (ifa = *ifap) != NULL;
470              ifap = &ifa->if_next) {
471                 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
472                         break;
473         }
474
475         ifp->if_next = *ifap;
476         *ifap = ifp;
477 }
478
479 /* On success it returns ifp with increased reference count */
480
481 static struct inet6_ifaddr *
482 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
483               int scope, u32 flags)
484 {
485         struct inet6_ifaddr *ifa = NULL;
486         struct rt6_info *rt;
487         int hash;
488         int err = 0;
489
490         rcu_read_lock_bh();
491         if (idev->dead) {
492                 err = -ENODEV;                  /*XXX*/
493                 goto out2;
494         }
495
496         write_lock(&addrconf_hash_lock);
497
498         /* Ignore adding duplicate addresses on an interface */
499         if (ipv6_chk_same_addr(addr, idev->dev)) {
500                 ADBG(("ipv6_add_addr: already assigned\n"));
501                 err = -EEXIST;
502                 goto out;
503         }
504
505         ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
506
507         if (ifa == NULL) {
508                 ADBG(("ipv6_add_addr: malloc failed\n"));
509                 err = -ENOBUFS;
510                 goto out;
511         }
512
513         rt = addrconf_dst_alloc(idev, addr, 0);
514         if (IS_ERR(rt)) {
515                 err = PTR_ERR(rt);
516                 goto out;
517         }
518
519         ipv6_addr_copy(&ifa->addr, addr);
520
521         spin_lock_init(&ifa->lock);
522         init_timer(&ifa->timer);
523         ifa->timer.data = (unsigned long) ifa;
524         ifa->scope = scope;
525         ifa->prefix_len = pfxlen;
526         ifa->flags = flags | IFA_F_TENTATIVE;
527         ifa->cstamp = ifa->tstamp = jiffies;
528
529         ifa->rt = rt;
530
531         ifa->idev = idev;
532         in6_dev_hold(idev);
533         /* For caller */
534         in6_ifa_hold(ifa);
535
536         /* Add to big hash table */
537         hash = ipv6_addr_hash(addr);
538
539         ifa->lst_next = inet6_addr_lst[hash];
540         inet6_addr_lst[hash] = ifa;
541         in6_ifa_hold(ifa);
542         write_unlock(&addrconf_hash_lock);
543
544         write_lock(&idev->lock);
545         /* Add to inet6_dev unicast addr list. */
546         ipv6_link_dev_addr(idev, ifa);
547
548 #ifdef CONFIG_IPV6_PRIVACY
549         if (ifa->flags&IFA_F_TEMPORARY) {
550                 ifa->tmp_next = idev->tempaddr_list;
551                 idev->tempaddr_list = ifa;
552                 in6_ifa_hold(ifa);
553         }
554 #endif
555
556         in6_ifa_hold(ifa);
557         write_unlock(&idev->lock);
558 out2:
559         rcu_read_unlock_bh();
560
561         if (likely(err == 0))
562                 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
563         else {
564                 kfree(ifa);
565                 ifa = ERR_PTR(err);
566         }
567
568         return ifa;
569 out:
570         write_unlock(&addrconf_hash_lock);
571         goto out2;
572 }
573
574 /* This function wants to get referenced ifp and releases it before return */
575
576 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
577 {
578         struct inet6_ifaddr *ifa, **ifap;
579         struct inet6_dev *idev = ifp->idev;
580         int hash;
581         int deleted = 0, onlink = 0;
582         unsigned long expires = jiffies;
583
584         hash = ipv6_addr_hash(&ifp->addr);
585
586         ifp->dead = 1;
587
588         write_lock_bh(&addrconf_hash_lock);
589         for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
590              ifap = &ifa->lst_next) {
591                 if (ifa == ifp) {
592                         *ifap = ifa->lst_next;
593                         __in6_ifa_put(ifp);
594                         ifa->lst_next = NULL;
595                         break;
596                 }
597         }
598         write_unlock_bh(&addrconf_hash_lock);
599
600         write_lock_bh(&idev->lock);
601 #ifdef CONFIG_IPV6_PRIVACY
602         if (ifp->flags&IFA_F_TEMPORARY) {
603                 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
604                      ifap = &ifa->tmp_next) {
605                         if (ifa == ifp) {
606                                 *ifap = ifa->tmp_next;
607                                 if (ifp->ifpub) {
608                                         in6_ifa_put(ifp->ifpub);
609                                         ifp->ifpub = NULL;
610                                 }
611                                 __in6_ifa_put(ifp);
612                                 ifa->tmp_next = NULL;
613                                 break;
614                         }
615                 }
616         }
617 #endif
618
619         for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
620                 if (ifa == ifp) {
621                         *ifap = ifa->if_next;
622                         __in6_ifa_put(ifp);
623                         ifa->if_next = NULL;
624                         if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
625                                 break;
626                         deleted = 1;
627                         continue;
628                 } else if (ifp->flags & IFA_F_PERMANENT) {
629                         if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
630                                               ifp->prefix_len)) {
631                                 if (ifa->flags & IFA_F_PERMANENT) {
632                                         onlink = 1;
633                                         if (deleted)
634                                                 break;
635                                 } else {
636                                         unsigned long lifetime;
637
638                                         if (!onlink)
639                                                 onlink = -1;
640
641                                         spin_lock(&ifa->lock);
642                                         lifetime = min_t(unsigned long,
643                                                          ifa->valid_lft, 0x7fffffffUL/HZ);
644                                         if (time_before(expires,
645                                                         ifa->tstamp + lifetime * HZ))
646                                                 expires = ifa->tstamp + lifetime * HZ;
647                                         spin_unlock(&ifa->lock);
648                                 }
649                         }
650                 }
651                 ifap = &ifa->if_next;
652         }
653         write_unlock_bh(&idev->lock);
654
655         ipv6_ifa_notify(RTM_DELADDR, ifp);
656
657         atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
658
659         addrconf_del_timer(ifp);
660
661         /*
662          * Purge or update corresponding prefix
663          *
664          * 1) we don't purge prefix here if address was not permanent.
665          *    prefix is managed by its own lifetime.
666          * 2) if there're no addresses, delete prefix.
667          * 3) if there're still other permanent address(es),
668          *    corresponding prefix is still permanent.
669          * 4) otherwise, update prefix lifetime to the
670          *    longest valid lifetime among the corresponding
671          *    addresses on the device.
672          *    Note: subsequent RA will update lifetime.
673          *
674          * --yoshfuji
675          */
676         if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
677                 struct in6_addr prefix;
678                 struct rt6_info *rt;
679
680                 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
681                 rt = rt6_lookup(&prefix, NULL, ifp->idev->dev->ifindex, 1);
682
683                 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
684                         if (onlink == 0) {
685                                 ip6_del_rt(rt);
686                                 rt = NULL;
687                         } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
688                                 rt->rt6i_expires = expires;
689                                 rt->rt6i_flags |= RTF_EXPIRES;
690                         }
691                 }
692                 dst_release(&rt->u.dst);
693         }
694
695         in6_ifa_put(ifp);
696 }
697
698 #ifdef CONFIG_IPV6_PRIVACY
699 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
700 {
701         struct inet6_dev *idev = ifp->idev;
702         struct in6_addr addr, *tmpaddr;
703         unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
704         int tmp_plen;
705         int ret = 0;
706         int max_addresses;
707
708         write_lock(&idev->lock);
709         if (ift) {
710                 spin_lock_bh(&ift->lock);
711                 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
712                 spin_unlock_bh(&ift->lock);
713                 tmpaddr = &addr;
714         } else {
715                 tmpaddr = NULL;
716         }
717 retry:
718         in6_dev_hold(idev);
719         if (idev->cnf.use_tempaddr <= 0) {
720                 write_unlock(&idev->lock);
721                 printk(KERN_INFO
722                         "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
723                 in6_dev_put(idev);
724                 ret = -1;
725                 goto out;
726         }
727         spin_lock_bh(&ifp->lock);
728         if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
729                 idev->cnf.use_tempaddr = -1;    /*XXX*/
730                 spin_unlock_bh(&ifp->lock);
731                 write_unlock(&idev->lock);
732                 printk(KERN_WARNING
733                         "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
734                 in6_dev_put(idev);
735                 ret = -1;
736                 goto out;
737         }
738         in6_ifa_hold(ifp);
739         memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
740         if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
741                 spin_unlock_bh(&ifp->lock);
742                 write_unlock(&idev->lock);
743                 printk(KERN_WARNING
744                         "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
745                 in6_ifa_put(ifp);
746                 in6_dev_put(idev);
747                 ret = -1;
748                 goto out;
749         }
750         memcpy(&addr.s6_addr[8], idev->rndid, 8);
751         tmp_valid_lft = min_t(__u32,
752                               ifp->valid_lft,
753                               idev->cnf.temp_valid_lft);
754         tmp_prefered_lft = min_t(__u32,
755                                  ifp->prefered_lft,
756                                  idev->cnf.temp_prefered_lft - desync_factor / HZ);
757         tmp_plen = ifp->prefix_len;
758         max_addresses = idev->cnf.max_addresses;
759         tmp_cstamp = ifp->cstamp;
760         tmp_tstamp = ifp->tstamp;
761         spin_unlock_bh(&ifp->lock);
762
763         write_unlock(&idev->lock);
764         ift = !max_addresses ||
765               ipv6_count_addresses(idev) < max_addresses ?
766                 ipv6_add_addr(idev, &addr, tmp_plen,
767                               ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK, IFA_F_TEMPORARY) : NULL;
768         if (!ift || IS_ERR(ift)) {
769                 in6_ifa_put(ifp);
770                 in6_dev_put(idev);
771                 printk(KERN_INFO
772                         "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
773                 tmpaddr = &addr;
774                 write_lock(&idev->lock);
775                 goto retry;
776         }
777
778         spin_lock_bh(&ift->lock);
779         ift->ifpub = ifp;
780         ift->valid_lft = tmp_valid_lft;
781         ift->prefered_lft = tmp_prefered_lft;
782         ift->cstamp = tmp_cstamp;
783         ift->tstamp = tmp_tstamp;
784         spin_unlock_bh(&ift->lock);
785
786         addrconf_dad_start(ift, 0);
787         in6_ifa_put(ift);
788         in6_dev_put(idev);
789 out:
790         return ret;
791 }
792 #endif
793
794 /*
795  *      Choose an appropriate source address (RFC3484)
796  */
797 struct ipv6_saddr_score {
798         int             addr_type;
799         unsigned int    attrs;
800         int             matchlen;
801         int             scope;
802         unsigned int    rule;
803 };
804
805 #define IPV6_SADDR_SCORE_LOCAL          0x0001
806 #define IPV6_SADDR_SCORE_PREFERRED      0x0004
807 #define IPV6_SADDR_SCORE_HOA            0x0008
808 #define IPV6_SADDR_SCORE_OIF            0x0010
809 #define IPV6_SADDR_SCORE_LABEL          0x0020
810 #define IPV6_SADDR_SCORE_PRIVACY        0x0040
811
812 static inline int ipv6_saddr_preferred(int type)
813 {
814         if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
815                     IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
816                 return 1;
817         return 0;
818 }
819
820 /* static matching label */
821 static inline int ipv6_saddr_label(const struct in6_addr *addr, int type)
822 {
823  /*
824   *     prefix (longest match)  label
825   *     -----------------------------
826   *     ::1/128                 0
827   *     ::/0                    1
828   *     2002::/16               2
829   *     ::/96                   3
830   *     ::ffff:0:0/96           4
831   *     fc00::/7                5
832   *     2001::/32               6
833   */
834         if (type & IPV6_ADDR_LOOPBACK)
835                 return 0;
836         else if (type & IPV6_ADDR_COMPATv4)
837                 return 3;
838         else if (type & IPV6_ADDR_MAPPED)
839                 return 4;
840         else if (addr->s6_addr32[0] == htonl(0x20010000))
841                 return 6;
842         else if (addr->s6_addr16[0] == htons(0x2002))
843                 return 2;
844         else if ((addr->s6_addr[0] & 0xfe) == 0xfc)
845                 return 5;
846         return 1;
847 }
848
849 int ipv6_dev_get_saddr(struct net_device *daddr_dev,
850                        struct in6_addr *daddr, struct in6_addr *saddr)
851 {
852         struct ipv6_saddr_score hiscore;
853         struct inet6_ifaddr *ifa_result = NULL;
854         int daddr_type = __ipv6_addr_type(daddr);
855         int daddr_scope = __ipv6_addr_src_scope(daddr_type);
856         u32 daddr_label = ipv6_saddr_label(daddr, daddr_type);
857         struct net_device *dev;
858
859         memset(&hiscore, 0, sizeof(hiscore));
860
861         read_lock(&dev_base_lock);
862         rcu_read_lock();
863
864         for (dev = dev_base; dev; dev=dev->next) {
865                 struct inet6_dev *idev;
866                 struct inet6_ifaddr *ifa;
867
868                 /* Rule 0: Candidate Source Address (section 4)
869                  *  - multicast and link-local destination address,
870                  *    the set of candidate source address MUST only
871                  *    include addresses assigned to interfaces
872                  *    belonging to the same link as the outgoing
873                  *    interface.
874                  * (- For site-local destination addresses, the
875                  *    set of candidate source addresses MUST only
876                  *    include addresses assigned to interfaces
877                  *    belonging to the same site as the outgoing
878                  *    interface.)
879                  */
880                 if ((daddr_type & IPV6_ADDR_MULTICAST ||
881                      daddr_scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
882                     daddr_dev && dev != daddr_dev)
883                         continue;
884
885                 idev = __in6_dev_get(dev);
886                 if (!idev)
887                         continue;
888
889                 read_lock_bh(&idev->lock);
890                 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
891                         struct ipv6_saddr_score score;
892
893                         score.addr_type = __ipv6_addr_type(&ifa->addr);
894
895                         /* Rule 0:
896                          * - Tentative Address (RFC2462 section 5.4)
897                          *  - A tentative address is not considered
898                          *    "assigned to an interface" in the traditional
899                          *    sense.
900                          * - Candidate Source Address (section 4)
901                          *  - In any case, anycast addresses, multicast
902                          *    addresses, and the unspecified address MUST
903                          *    NOT be included in a candidate set.
904                          */
905                         if (ifa->flags & IFA_F_TENTATIVE)
906                                 continue;
907                         if (unlikely(score.addr_type == IPV6_ADDR_ANY ||
908                                      score.addr_type & IPV6_ADDR_MULTICAST)) {
909                                 LIMIT_NETDEBUG(KERN_DEBUG
910                                                "ADDRCONF: unspecified / multicast address"
911                                                "assigned as unicast address on %s",
912                                                dev->name);
913                                 continue;
914                         }
915
916                         score.attrs = 0;
917                         score.matchlen = 0;
918                         score.scope = 0;
919                         score.rule = 0;
920
921                         if (ifa_result == NULL) {
922                                 /* record it if the first available entry */
923                                 goto record_it;
924                         }
925
926                         /* Rule 1: Prefer same address */
927                         if (hiscore.rule < 1) {
928                                 if (ipv6_addr_equal(&ifa_result->addr, daddr))
929                                         hiscore.attrs |= IPV6_SADDR_SCORE_LOCAL;
930                                 hiscore.rule++;
931                         }
932                         if (ipv6_addr_equal(&ifa->addr, daddr)) {
933                                 score.attrs |= IPV6_SADDR_SCORE_LOCAL;
934                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)) {
935                                         score.rule = 1;
936                                         goto record_it;
937                                 }
938                         } else {
939                                 if (hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)
940                                         continue;
941                         }
942
943                         /* Rule 2: Prefer appropriate scope */
944                         if (hiscore.rule < 2) {
945                                 hiscore.scope = __ipv6_addr_src_scope(hiscore.addr_type);
946                                 hiscore.rule++;
947                         }
948                         score.scope = __ipv6_addr_src_scope(score.addr_type);
949                         if (hiscore.scope < score.scope) {
950                                 if (hiscore.scope < daddr_scope) {
951                                         score.rule = 2;
952                                         goto record_it;
953                                 } else
954                                         continue;
955                         } else if (score.scope < hiscore.scope) {
956                                 if (score.scope < daddr_scope)
957                                         break; /* addresses sorted by scope */
958                                 else {
959                                         score.rule = 2;
960                                         goto record_it;
961                                 }
962                         }
963
964                         /* Rule 3: Avoid deprecated address */
965                         if (hiscore.rule < 3) {
966                                 if (ipv6_saddr_preferred(hiscore.addr_type) ||
967                                     !(ifa_result->flags & IFA_F_DEPRECATED))
968                                         hiscore.attrs |= IPV6_SADDR_SCORE_PREFERRED;
969                                 hiscore.rule++;
970                         }
971                         if (ipv6_saddr_preferred(score.addr_type) ||
972                             !(ifa->flags & IFA_F_DEPRECATED)) {
973                                 score.attrs |= IPV6_SADDR_SCORE_PREFERRED;
974                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)) {
975                                         score.rule = 3;
976                                         goto record_it;
977                                 }
978                         } else {
979                                 if (hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)
980                                         continue;
981                         }
982
983                         /* Rule 4: Prefer home address */
984 #ifdef CONFIG_IPV6_MIP6
985                         if (hiscore.rule < 4) {
986                                 if (ifa_result->flags & IFA_F_HOMEADDRESS)
987                                         hiscore.attrs |= IPV6_SADDR_SCORE_HOA;
988                                 hiscore.rule++;
989                         }
990                         if (ifa->flags & IFA_F_HOMEADDRESS) {
991                                 score.attrs |= IPV6_SADDR_SCORE_HOA;
992                                 if (!(ifa_result->flags & IFA_F_HOMEADDRESS)) {
993                                         score.rule = 4;
994                                         goto record_it;
995                                 }
996                         } else {
997                                 if (hiscore.attrs & IPV6_SADDR_SCORE_HOA)
998                                         continue;
999                         }
1000 #else
1001                         if (hiscore.rule < 4)
1002                                 hiscore.rule++;
1003 #endif
1004
1005                         /* Rule 5: Prefer outgoing interface */
1006                         if (hiscore.rule < 5) {
1007                                 if (daddr_dev == NULL ||
1008                                     daddr_dev == ifa_result->idev->dev)
1009                                         hiscore.attrs |= IPV6_SADDR_SCORE_OIF;
1010                                 hiscore.rule++;
1011                         }
1012                         if (daddr_dev == NULL ||
1013                             daddr_dev == ifa->idev->dev) {
1014                                 score.attrs |= IPV6_SADDR_SCORE_OIF;
1015                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_OIF)) {
1016                                         score.rule = 5;
1017                                         goto record_it;
1018                                 }
1019                         } else {
1020                                 if (hiscore.attrs & IPV6_SADDR_SCORE_OIF)
1021                                         continue;
1022                         }
1023
1024                         /* Rule 6: Prefer matching label */
1025                         if (hiscore.rule < 6) {
1026                                 if (ipv6_saddr_label(&ifa_result->addr, hiscore.addr_type) == daddr_label)
1027                                         hiscore.attrs |= IPV6_SADDR_SCORE_LABEL;
1028                                 hiscore.rule++;
1029                         }
1030                         if (ipv6_saddr_label(&ifa->addr, score.addr_type) == daddr_label) {
1031                                 score.attrs |= IPV6_SADDR_SCORE_LABEL;
1032                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LABEL)) {
1033                                         score.rule = 6;
1034                                         goto record_it;
1035                                 }
1036                         } else {
1037                                 if (hiscore.attrs & IPV6_SADDR_SCORE_LABEL)
1038                                         continue;
1039                         }
1040
1041 #ifdef CONFIG_IPV6_PRIVACY
1042                         /* Rule 7: Prefer public address
1043                          * Note: prefer temprary address if use_tempaddr >= 2
1044                          */
1045                         if (hiscore.rule < 7) {
1046                                 if ((!(ifa_result->flags & IFA_F_TEMPORARY)) ^
1047                                     (ifa_result->idev->cnf.use_tempaddr >= 2))
1048                                         hiscore.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1049                                 hiscore.rule++;
1050                         }
1051                         if ((!(ifa->flags & IFA_F_TEMPORARY)) ^
1052                             (ifa->idev->cnf.use_tempaddr >= 2)) {
1053                                 score.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1054                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)) {
1055                                         score.rule = 7;
1056                                         goto record_it;
1057                                 }
1058                         } else {
1059                                 if (hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)
1060                                         continue;
1061                         }
1062 #else
1063                         if (hiscore.rule < 7)
1064                                 hiscore.rule++;
1065 #endif
1066                         /* Rule 8: Use longest matching prefix */
1067                         if (hiscore.rule < 8) {
1068                                 hiscore.matchlen = ipv6_addr_diff(&ifa_result->addr, daddr);
1069                                 hiscore.rule++;
1070                         }
1071                         score.matchlen = ipv6_addr_diff(&ifa->addr, daddr);
1072                         if (score.matchlen > hiscore.matchlen) {
1073                                 score.rule = 8;
1074                                 goto record_it;
1075                         }
1076 #if 0
1077                         else if (score.matchlen < hiscore.matchlen)
1078                                 continue;
1079 #endif
1080
1081                         /* Final Rule: choose first available one */
1082                         continue;
1083 record_it:
1084                         if (ifa_result)
1085                                 in6_ifa_put(ifa_result);
1086                         in6_ifa_hold(ifa);
1087                         ifa_result = ifa;
1088                         hiscore = score;
1089                 }
1090                 read_unlock_bh(&idev->lock);
1091         }
1092         rcu_read_unlock();
1093         read_unlock(&dev_base_lock);
1094
1095         if (!ifa_result)
1096                 return -EADDRNOTAVAIL;
1097
1098         ipv6_addr_copy(saddr, &ifa_result->addr);
1099         in6_ifa_put(ifa_result);
1100         return 0;
1101 }
1102
1103
1104 int ipv6_get_saddr(struct dst_entry *dst,
1105                    struct in6_addr *daddr, struct in6_addr *saddr)
1106 {
1107         return ipv6_dev_get_saddr(dst ? ip6_dst_idev(dst)->dev : NULL, daddr, saddr);
1108 }
1109
1110
1111 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr)
1112 {
1113         struct inet6_dev *idev;
1114         int err = -EADDRNOTAVAIL;
1115
1116         rcu_read_lock();
1117         if ((idev = __in6_dev_get(dev)) != NULL) {
1118                 struct inet6_ifaddr *ifp;
1119
1120                 read_lock_bh(&idev->lock);
1121                 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1122                         if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1123                                 ipv6_addr_copy(addr, &ifp->addr);
1124                                 err = 0;
1125                                 break;
1126                         }
1127                 }
1128                 read_unlock_bh(&idev->lock);
1129         }
1130         rcu_read_unlock();
1131         return err;
1132 }
1133
1134 static int ipv6_count_addresses(struct inet6_dev *idev)
1135 {
1136         int cnt = 0;
1137         struct inet6_ifaddr *ifp;
1138
1139         read_lock_bh(&idev->lock);
1140         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1141                 cnt++;
1142         read_unlock_bh(&idev->lock);
1143         return cnt;
1144 }
1145
1146 int ipv6_chk_addr(struct in6_addr *addr, struct net_device *dev, int strict)
1147 {
1148         struct inet6_ifaddr * ifp;
1149         u8 hash = ipv6_addr_hash(addr);
1150
1151         read_lock_bh(&addrconf_hash_lock);
1152         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1153                 if (ipv6_addr_equal(&ifp->addr, addr) &&
1154                     !(ifp->flags&IFA_F_TENTATIVE)) {
1155                         if (dev == NULL || ifp->idev->dev == dev ||
1156                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1157                                 break;
1158                 }
1159         }
1160         read_unlock_bh(&addrconf_hash_lock);
1161         return ifp != NULL;
1162 }
1163
1164 static
1165 int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev)
1166 {
1167         struct inet6_ifaddr * ifp;
1168         u8 hash = ipv6_addr_hash(addr);
1169
1170         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1171                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1172                         if (dev == NULL || ifp->idev->dev == dev)
1173                                 break;
1174                 }
1175         }
1176         return ifp != NULL;
1177 }
1178
1179 struct inet6_ifaddr * ipv6_get_ifaddr(struct in6_addr *addr, struct net_device *dev, int strict)
1180 {
1181         struct inet6_ifaddr * ifp;
1182         u8 hash = ipv6_addr_hash(addr);
1183
1184         read_lock_bh(&addrconf_hash_lock);
1185         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1186                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1187                         if (dev == NULL || ifp->idev->dev == dev ||
1188                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1189                                 in6_ifa_hold(ifp);
1190                                 break;
1191                         }
1192                 }
1193         }
1194         read_unlock_bh(&addrconf_hash_lock);
1195
1196         return ifp;
1197 }
1198
1199 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1200 {
1201         const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
1202         const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
1203         __be32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
1204         __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1205         int sk_ipv6only = ipv6_only_sock(sk);
1206         int sk2_ipv6only = inet_v6_ipv6only(sk2);
1207         int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1208         int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1209
1210         if (!sk2_rcv_saddr && !sk_ipv6only)
1211                 return 1;
1212
1213         if (addr_type2 == IPV6_ADDR_ANY &&
1214             !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1215                 return 1;
1216
1217         if (addr_type == IPV6_ADDR_ANY &&
1218             !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1219                 return 1;
1220
1221         if (sk2_rcv_saddr6 &&
1222             ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1223                 return 1;
1224
1225         if (addr_type == IPV6_ADDR_MAPPED &&
1226             !sk2_ipv6only &&
1227             (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1228                 return 1;
1229
1230         return 0;
1231 }
1232
1233 /* Gets referenced address, destroys ifaddr */
1234
1235 static void addrconf_dad_stop(struct inet6_ifaddr *ifp)
1236 {
1237         if (ifp->flags&IFA_F_PERMANENT) {
1238                 spin_lock_bh(&ifp->lock);
1239                 addrconf_del_timer(ifp);
1240                 ifp->flags |= IFA_F_TENTATIVE;
1241                 spin_unlock_bh(&ifp->lock);
1242                 in6_ifa_put(ifp);
1243 #ifdef CONFIG_IPV6_PRIVACY
1244         } else if (ifp->flags&IFA_F_TEMPORARY) {
1245                 struct inet6_ifaddr *ifpub;
1246                 spin_lock_bh(&ifp->lock);
1247                 ifpub = ifp->ifpub;
1248                 if (ifpub) {
1249                         in6_ifa_hold(ifpub);
1250                         spin_unlock_bh(&ifp->lock);
1251                         ipv6_create_tempaddr(ifpub, ifp);
1252                         in6_ifa_put(ifpub);
1253                 } else {
1254                         spin_unlock_bh(&ifp->lock);
1255                 }
1256                 ipv6_del_addr(ifp);
1257 #endif
1258         } else
1259                 ipv6_del_addr(ifp);
1260 }
1261
1262 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1263 {
1264         if (net_ratelimit())
1265                 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1266         addrconf_dad_stop(ifp);
1267 }
1268
1269 /* Join to solicited addr multicast group. */
1270
1271 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1272 {
1273         struct in6_addr maddr;
1274
1275         if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1276                 return;
1277
1278         addrconf_addr_solict_mult(addr, &maddr);
1279         ipv6_dev_mc_inc(dev, &maddr);
1280 }
1281
1282 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1283 {
1284         struct in6_addr maddr;
1285
1286         if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1287                 return;
1288
1289         addrconf_addr_solict_mult(addr, &maddr);
1290         __ipv6_dev_mc_dec(idev, &maddr);
1291 }
1292
1293 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1294 {
1295         struct in6_addr addr;
1296         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1297         if (ipv6_addr_any(&addr))
1298                 return;
1299         ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1300 }
1301
1302 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1303 {
1304         struct in6_addr addr;
1305         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1306         if (ipv6_addr_any(&addr))
1307                 return;
1308         __ipv6_dev_ac_dec(ifp->idev, &addr);
1309 }
1310
1311 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1312 {
1313         if (dev->addr_len != ETH_ALEN)
1314                 return -1;
1315         memcpy(eui, dev->dev_addr, 3);
1316         memcpy(eui + 5, dev->dev_addr + 3, 3);
1317
1318         /*
1319          * The zSeries OSA network cards can be shared among various
1320          * OS instances, but the OSA cards have only one MAC address.
1321          * This leads to duplicate address conflicts in conjunction
1322          * with IPv6 if more than one instance uses the same card.
1323          *
1324          * The driver for these cards can deliver a unique 16-bit
1325          * identifier for each instance sharing the same card.  It is
1326          * placed instead of 0xFFFE in the interface identifier.  The
1327          * "u" bit of the interface identifier is not inverted in this
1328          * case.  Hence the resulting interface identifier has local
1329          * scope according to RFC2373.
1330          */
1331         if (dev->dev_id) {
1332                 eui[3] = (dev->dev_id >> 8) & 0xFF;
1333                 eui[4] = dev->dev_id & 0xFF;
1334         } else {
1335                 eui[3] = 0xFF;
1336                 eui[4] = 0xFE;
1337                 eui[0] ^= 2;
1338         }
1339         return 0;
1340 }
1341
1342 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1343 {
1344         /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1345         if (dev->addr_len != ARCNET_ALEN)
1346                 return -1;
1347         memset(eui, 0, 7);
1348         eui[7] = *(u8*)dev->dev_addr;
1349         return 0;
1350 }
1351
1352 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1353 {
1354         if (dev->addr_len != INFINIBAND_ALEN)
1355                 return -1;
1356         memcpy(eui, dev->dev_addr + 12, 8);
1357         eui[0] |= 2;
1358         return 0;
1359 }
1360
1361 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1362 {
1363         switch (dev->type) {
1364         case ARPHRD_ETHER:
1365         case ARPHRD_FDDI:
1366         case ARPHRD_IEEE802_TR:
1367                 return addrconf_ifid_eui48(eui, dev);
1368         case ARPHRD_ARCNET:
1369                 return addrconf_ifid_arcnet(eui, dev);
1370         case ARPHRD_INFINIBAND:
1371                 return addrconf_ifid_infiniband(eui, dev);
1372         }
1373         return -1;
1374 }
1375
1376 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1377 {
1378         int err = -1;
1379         struct inet6_ifaddr *ifp;
1380
1381         read_lock_bh(&idev->lock);
1382         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1383                 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1384                         memcpy(eui, ifp->addr.s6_addr+8, 8);
1385                         err = 0;
1386                         break;
1387                 }
1388         }
1389         read_unlock_bh(&idev->lock);
1390         return err;
1391 }
1392
1393 #ifdef CONFIG_IPV6_PRIVACY
1394 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1395 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1396 {
1397 regen:
1398         get_random_bytes(idev->rndid, sizeof(idev->rndid));
1399         idev->rndid[0] &= ~0x02;
1400
1401         /*
1402          * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1403          * check if generated address is not inappropriate
1404          *
1405          *  - Reserved subnet anycast (RFC 2526)
1406          *      11111101 11....11 1xxxxxxx
1407          *  - ISATAP (draft-ietf-ngtrans-isatap-13.txt) 5.1
1408          *      00-00-5E-FE-xx-xx-xx-xx
1409          *  - value 0
1410          *  - XXX: already assigned to an address on the device
1411          */
1412         if (idev->rndid[0] == 0xfd &&
1413             (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1414             (idev->rndid[7]&0x80))
1415                 goto regen;
1416         if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1417                 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1418                         goto regen;
1419                 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1420                         goto regen;
1421         }
1422
1423         return 0;
1424 }
1425
1426 static void ipv6_regen_rndid(unsigned long data)
1427 {
1428         struct inet6_dev *idev = (struct inet6_dev *) data;
1429         unsigned long expires;
1430
1431         rcu_read_lock_bh();
1432         write_lock_bh(&idev->lock);
1433
1434         if (idev->dead)
1435                 goto out;
1436
1437         if (__ipv6_regen_rndid(idev) < 0)
1438                 goto out;
1439
1440         expires = jiffies +
1441                 idev->cnf.temp_prefered_lft * HZ -
1442                 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1443         if (time_before(expires, jiffies)) {
1444                 printk(KERN_WARNING
1445                         "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1446                         idev->dev->name);
1447                 goto out;
1448         }
1449
1450         if (!mod_timer(&idev->regen_timer, expires))
1451                 in6_dev_hold(idev);
1452
1453 out:
1454         write_unlock_bh(&idev->lock);
1455         rcu_read_unlock_bh();
1456         in6_dev_put(idev);
1457 }
1458
1459 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1460         int ret = 0;
1461
1462         if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1463                 ret = __ipv6_regen_rndid(idev);
1464         return ret;
1465 }
1466 #endif
1467
1468 /*
1469  *      Add prefix route.
1470  */
1471
1472 static void
1473 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1474                       unsigned long expires, u32 flags)
1475 {
1476         struct fib6_config cfg = {
1477                 .fc_table = RT6_TABLE_PREFIX,
1478                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1479                 .fc_ifindex = dev->ifindex,
1480                 .fc_expires = expires,
1481                 .fc_dst_len = plen,
1482                 .fc_flags = RTF_UP | flags,
1483         };
1484
1485         ipv6_addr_copy(&cfg.fc_dst, pfx);
1486
1487         /* Prevent useless cloning on PtP SIT.
1488            This thing is done here expecting that the whole
1489            class of non-broadcast devices need not cloning.
1490          */
1491 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1492         if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1493                 cfg.fc_flags |= RTF_NONEXTHOP;
1494 #endif
1495
1496         ip6_route_add(&cfg);
1497 }
1498
1499 /* Create "default" multicast route to the interface */
1500
1501 static void addrconf_add_mroute(struct net_device *dev)
1502 {
1503         struct fib6_config cfg = {
1504                 .fc_table = RT6_TABLE_LOCAL,
1505                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1506                 .fc_ifindex = dev->ifindex,
1507                 .fc_dst_len = 8,
1508                 .fc_flags = RTF_UP,
1509         };
1510
1511         ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1512
1513         ip6_route_add(&cfg);
1514 }
1515
1516 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1517 static void sit_route_add(struct net_device *dev)
1518 {
1519         struct fib6_config cfg = {
1520                 .fc_table = RT6_TABLE_MAIN,
1521                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1522                 .fc_ifindex = dev->ifindex,
1523                 .fc_dst_len = 96,
1524                 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1525         };
1526
1527         /* prefix length - 96 bits "::d.d.d.d" */
1528         ip6_route_add(&cfg);
1529 }
1530 #endif
1531
1532 static void addrconf_add_lroute(struct net_device *dev)
1533 {
1534         struct in6_addr addr;
1535
1536         ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
1537         addrconf_prefix_route(&addr, 64, dev, 0, 0);
1538 }
1539
1540 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1541 {
1542         struct inet6_dev *idev;
1543
1544         ASSERT_RTNL();
1545
1546         if ((idev = ipv6_find_idev(dev)) == NULL)
1547                 return NULL;
1548
1549         /* Add default multicast route */
1550         addrconf_add_mroute(dev);
1551
1552         /* Add link local route */
1553         addrconf_add_lroute(dev);
1554         return idev;
1555 }
1556
1557 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1558 {
1559         struct prefix_info *pinfo;
1560         __u32 valid_lft;
1561         __u32 prefered_lft;
1562         int addr_type;
1563         unsigned long rt_expires;
1564         struct inet6_dev *in6_dev;
1565
1566         pinfo = (struct prefix_info *) opt;
1567
1568         if (len < sizeof(struct prefix_info)) {
1569                 ADBG(("addrconf: prefix option too short\n"));
1570                 return;
1571         }
1572
1573         /*
1574          *      Validation checks ([ADDRCONF], page 19)
1575          */
1576
1577         addr_type = ipv6_addr_type(&pinfo->prefix);
1578
1579         if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1580                 return;
1581
1582         valid_lft = ntohl(pinfo->valid);
1583         prefered_lft = ntohl(pinfo->prefered);
1584
1585         if (prefered_lft > valid_lft) {
1586                 if (net_ratelimit())
1587                         printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1588                 return;
1589         }
1590
1591         in6_dev = in6_dev_get(dev);
1592
1593         if (in6_dev == NULL) {
1594                 if (net_ratelimit())
1595                         printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1596                 return;
1597         }
1598
1599         /*
1600          *      Two things going on here:
1601          *      1) Add routes for on-link prefixes
1602          *      2) Configure prefixes with the auto flag set
1603          */
1604
1605         /* Avoid arithmetic overflow. Really, we could
1606            save rt_expires in seconds, likely valid_lft,
1607            but it would require division in fib gc, that it
1608            not good.
1609          */
1610         if (valid_lft >= 0x7FFFFFFF/HZ)
1611                 rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ);
1612         else
1613                 rt_expires = valid_lft * HZ;
1614
1615         /*
1616          * We convert this (in jiffies) to clock_t later.
1617          * Avoid arithmetic overflow there as well.
1618          * Overflow can happen only if HZ < USER_HZ.
1619          */
1620         if (HZ < USER_HZ && rt_expires > 0x7FFFFFFF / USER_HZ)
1621                 rt_expires = 0x7FFFFFFF / USER_HZ;
1622
1623         if (pinfo->onlink) {
1624                 struct rt6_info *rt;
1625                 rt = rt6_lookup(&pinfo->prefix, NULL, dev->ifindex, 1);
1626
1627                 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
1628                         if (rt->rt6i_flags&RTF_EXPIRES) {
1629                                 if (valid_lft == 0) {
1630                                         ip6_del_rt(rt);
1631                                         rt = NULL;
1632                                 } else {
1633                                         rt->rt6i_expires = jiffies + rt_expires;
1634                                 }
1635                         }
1636                 } else if (valid_lft) {
1637                         addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1638                                               dev, jiffies_to_clock_t(rt_expires), RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT);
1639                 }
1640                 if (rt)
1641                         dst_release(&rt->u.dst);
1642         }
1643
1644         /* Try to figure out our local address for this prefix */
1645
1646         if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1647                 struct inet6_ifaddr * ifp;
1648                 struct in6_addr addr;
1649                 int create = 0, update_lft = 0;
1650
1651                 if (pinfo->prefix_len == 64) {
1652                         memcpy(&addr, &pinfo->prefix, 8);
1653                         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1654                             ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1655                                 in6_dev_put(in6_dev);
1656                                 return;
1657                         }
1658                         goto ok;
1659                 }
1660                 if (net_ratelimit())
1661                         printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1662                                pinfo->prefix_len);
1663                 in6_dev_put(in6_dev);
1664                 return;
1665
1666 ok:
1667
1668                 ifp = ipv6_get_ifaddr(&addr, dev, 1);
1669
1670                 if (ifp == NULL && valid_lft) {
1671                         int max_addresses = in6_dev->cnf.max_addresses;
1672
1673                         /* Do not allow to create too much of autoconfigured
1674                          * addresses; this would be too easy way to crash kernel.
1675                          */
1676                         if (!max_addresses ||
1677                             ipv6_count_addresses(in6_dev) < max_addresses)
1678                                 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1679                                                     addr_type&IPV6_ADDR_SCOPE_MASK, 0);
1680
1681                         if (!ifp || IS_ERR(ifp)) {
1682                                 in6_dev_put(in6_dev);
1683                                 return;
1684                         }
1685
1686                         update_lft = create = 1;
1687                         ifp->cstamp = jiffies;
1688                         addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1689                 }
1690
1691                 if (ifp) {
1692                         int flags;
1693                         unsigned long now;
1694 #ifdef CONFIG_IPV6_PRIVACY
1695                         struct inet6_ifaddr *ift;
1696 #endif
1697                         u32 stored_lft;
1698
1699                         /* update lifetime (RFC2462 5.5.3 e) */
1700                         spin_lock(&ifp->lock);
1701                         now = jiffies;
1702                         if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1703                                 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1704                         else
1705                                 stored_lft = 0;
1706                         if (!update_lft && stored_lft) {
1707                                 if (valid_lft > MIN_VALID_LIFETIME ||
1708                                     valid_lft > stored_lft)
1709                                         update_lft = 1;
1710                                 else if (stored_lft <= MIN_VALID_LIFETIME) {
1711                                         /* valid_lft <= stored_lft is always true */
1712                                         /* XXX: IPsec */
1713                                         update_lft = 0;
1714                                 } else {
1715                                         valid_lft = MIN_VALID_LIFETIME;
1716                                         if (valid_lft < prefered_lft)
1717                                                 prefered_lft = valid_lft;
1718                                         update_lft = 1;
1719                                 }
1720                         }
1721
1722                         if (update_lft) {
1723                                 ifp->valid_lft = valid_lft;
1724                                 ifp->prefered_lft = prefered_lft;
1725                                 ifp->tstamp = now;
1726                                 flags = ifp->flags;
1727                                 ifp->flags &= ~IFA_F_DEPRECATED;
1728                                 spin_unlock(&ifp->lock);
1729
1730                                 if (!(flags&IFA_F_TENTATIVE))
1731                                         ipv6_ifa_notify(0, ifp);
1732                         } else
1733                                 spin_unlock(&ifp->lock);
1734
1735 #ifdef CONFIG_IPV6_PRIVACY
1736                         read_lock_bh(&in6_dev->lock);
1737                         /* update all temporary addresses in the list */
1738                         for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1739                                 /*
1740                                  * When adjusting the lifetimes of an existing
1741                                  * temporary address, only lower the lifetimes.
1742                                  * Implementations must not increase the
1743                                  * lifetimes of an existing temporary address
1744                                  * when processing a Prefix Information Option.
1745                                  */
1746                                 spin_lock(&ift->lock);
1747                                 flags = ift->flags;
1748                                 if (ift->valid_lft > valid_lft &&
1749                                     ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1750                                         ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1751                                 if (ift->prefered_lft > prefered_lft &&
1752                                     ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1753                                         ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1754                                 spin_unlock(&ift->lock);
1755                                 if (!(flags&IFA_F_TENTATIVE))
1756                                         ipv6_ifa_notify(0, ift);
1757                         }
1758
1759                         if (create && in6_dev->cnf.use_tempaddr > 0) {
1760                                 /*
1761                                  * When a new public address is created as described in [ADDRCONF],
1762                                  * also create a new temporary address.
1763                                  */
1764                                 read_unlock_bh(&in6_dev->lock);
1765                                 ipv6_create_tempaddr(ifp, NULL);
1766                         } else {
1767                                 read_unlock_bh(&in6_dev->lock);
1768                         }
1769 #endif
1770                         in6_ifa_put(ifp);
1771                         addrconf_verify(0);
1772                 }
1773         }
1774         inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
1775         in6_dev_put(in6_dev);
1776 }
1777
1778 /*
1779  *      Set destination address.
1780  *      Special case for SIT interfaces where we create a new "virtual"
1781  *      device.
1782  */
1783 int addrconf_set_dstaddr(void __user *arg)
1784 {
1785         struct in6_ifreq ireq;
1786         struct net_device *dev;
1787         int err = -EINVAL;
1788
1789         rtnl_lock();
1790
1791         err = -EFAULT;
1792         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1793                 goto err_exit;
1794
1795         dev = __dev_get_by_index(ireq.ifr6_ifindex);
1796
1797         err = -ENODEV;
1798         if (dev == NULL)
1799                 goto err_exit;
1800
1801 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1802         if (dev->type == ARPHRD_SIT) {
1803                 struct ifreq ifr;
1804                 mm_segment_t    oldfs;
1805                 struct ip_tunnel_parm p;
1806
1807                 err = -EADDRNOTAVAIL;
1808                 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
1809                         goto err_exit;
1810
1811                 memset(&p, 0, sizeof(p));
1812                 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
1813                 p.iph.saddr = 0;
1814                 p.iph.version = 4;
1815                 p.iph.ihl = 5;
1816                 p.iph.protocol = IPPROTO_IPV6;
1817                 p.iph.ttl = 64;
1818                 ifr.ifr_ifru.ifru_data = (void __user *)&p;
1819
1820                 oldfs = get_fs(); set_fs(KERNEL_DS);
1821                 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
1822                 set_fs(oldfs);
1823
1824                 if (err == 0) {
1825                         err = -ENOBUFS;
1826                         if ((dev = __dev_get_by_name(p.name)) == NULL)
1827                                 goto err_exit;
1828                         err = dev_open(dev);
1829                 }
1830         }
1831 #endif
1832
1833 err_exit:
1834         rtnl_unlock();
1835         return err;
1836 }
1837
1838 /*
1839  *      Manual configuration of address on an interface
1840  */
1841 static int inet6_addr_add(int ifindex, struct in6_addr *pfx, int plen,
1842                           __u8 ifa_flags, __u32 prefered_lft, __u32 valid_lft)
1843 {
1844         struct inet6_ifaddr *ifp;
1845         struct inet6_dev *idev;
1846         struct net_device *dev;
1847         int scope;
1848         u32 flags = RTF_EXPIRES;
1849
1850         ASSERT_RTNL();
1851
1852         /* check the lifetime */
1853         if (!valid_lft || prefered_lft > valid_lft)
1854                 return -EINVAL;
1855
1856         if ((dev = __dev_get_by_index(ifindex)) == NULL)
1857                 return -ENODEV;
1858
1859         if ((idev = addrconf_add_dev(dev)) == NULL)
1860                 return -ENOBUFS;
1861
1862         scope = ipv6_addr_scope(pfx);
1863
1864         if (valid_lft == INFINITY_LIFE_TIME) {
1865                 ifa_flags |= IFA_F_PERMANENT;
1866                 flags = 0;
1867         } else if (valid_lft >= 0x7FFFFFFF/HZ)
1868                 valid_lft = 0x7FFFFFFF/HZ;
1869
1870         if (prefered_lft == 0)
1871                 ifa_flags |= IFA_F_DEPRECATED;
1872         else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
1873                  (prefered_lft != INFINITY_LIFE_TIME))
1874                 prefered_lft = 0x7FFFFFFF/HZ;
1875
1876         ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
1877
1878         if (!IS_ERR(ifp)) {
1879                 spin_lock_bh(&ifp->lock);
1880                 ifp->valid_lft = valid_lft;
1881                 ifp->prefered_lft = prefered_lft;
1882                 ifp->tstamp = jiffies;
1883                 spin_unlock_bh(&ifp->lock);
1884
1885                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
1886                                       jiffies_to_clock_t(valid_lft * HZ), flags);
1887                 addrconf_dad_start(ifp, 0);
1888                 in6_ifa_put(ifp);
1889                 addrconf_verify(0);
1890                 return 0;
1891         }
1892
1893         return PTR_ERR(ifp);
1894 }
1895
1896 static int inet6_addr_del(int ifindex, struct in6_addr *pfx, int plen)
1897 {
1898         struct inet6_ifaddr *ifp;
1899         struct inet6_dev *idev;
1900         struct net_device *dev;
1901
1902         if ((dev = __dev_get_by_index(ifindex)) == NULL)
1903                 return -ENODEV;
1904
1905         if ((idev = __in6_dev_get(dev)) == NULL)
1906                 return -ENXIO;
1907
1908         read_lock_bh(&idev->lock);
1909         for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
1910                 if (ifp->prefix_len == plen &&
1911                     ipv6_addr_equal(pfx, &ifp->addr)) {
1912                         in6_ifa_hold(ifp);
1913                         read_unlock_bh(&idev->lock);
1914
1915                         ipv6_del_addr(ifp);
1916
1917                         /* If the last address is deleted administratively,
1918                            disable IPv6 on this interface.
1919                          */
1920                         if (idev->addr_list == NULL)
1921                                 addrconf_ifdown(idev->dev, 1);
1922                         return 0;
1923                 }
1924         }
1925         read_unlock_bh(&idev->lock);
1926         return -EADDRNOTAVAIL;
1927 }
1928
1929
1930 int addrconf_add_ifaddr(void __user *arg)
1931 {
1932         struct in6_ifreq ireq;
1933         int err;
1934
1935         if (!capable(CAP_NET_ADMIN))
1936                 return -EPERM;
1937
1938         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1939                 return -EFAULT;
1940
1941         rtnl_lock();
1942         err = inet6_addr_add(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen,
1943                              IFA_F_PERMANENT, INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1944         rtnl_unlock();
1945         return err;
1946 }
1947
1948 int addrconf_del_ifaddr(void __user *arg)
1949 {
1950         struct in6_ifreq ireq;
1951         int err;
1952
1953         if (!capable(CAP_NET_ADMIN))
1954                 return -EPERM;
1955
1956         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1957                 return -EFAULT;
1958
1959         rtnl_lock();
1960         err = inet6_addr_del(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
1961         rtnl_unlock();
1962         return err;
1963 }
1964
1965 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1966 static void sit_add_v4_addrs(struct inet6_dev *idev)
1967 {
1968         struct inet6_ifaddr * ifp;
1969         struct in6_addr addr;
1970         struct net_device *dev;
1971         int scope;
1972
1973         ASSERT_RTNL();
1974
1975         memset(&addr, 0, sizeof(struct in6_addr));
1976         memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
1977
1978         if (idev->dev->flags&IFF_POINTOPOINT) {
1979                 addr.s6_addr32[0] = htonl(0xfe800000);
1980                 scope = IFA_LINK;
1981         } else {
1982                 scope = IPV6_ADDR_COMPATv4;
1983         }
1984
1985         if (addr.s6_addr32[3]) {
1986                 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
1987                 if (!IS_ERR(ifp)) {
1988                         spin_lock_bh(&ifp->lock);
1989                         ifp->flags &= ~IFA_F_TENTATIVE;
1990                         spin_unlock_bh(&ifp->lock);
1991                         ipv6_ifa_notify(RTM_NEWADDR, ifp);
1992                         in6_ifa_put(ifp);
1993                 }
1994                 return;
1995         }
1996
1997         for (dev = dev_base; dev != NULL; dev = dev->next) {
1998                 struct in_device * in_dev = __in_dev_get_rtnl(dev);
1999                 if (in_dev && (dev->flags & IFF_UP)) {
2000                         struct in_ifaddr * ifa;
2001
2002                         int flag = scope;
2003
2004                         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2005                                 int plen;
2006
2007                                 addr.s6_addr32[3] = ifa->ifa_local;
2008
2009                                 if (ifa->ifa_scope == RT_SCOPE_LINK)
2010                                         continue;
2011                                 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2012                                         if (idev->dev->flags&IFF_POINTOPOINT)
2013                                                 continue;
2014                                         flag |= IFA_HOST;
2015                                 }
2016                                 if (idev->dev->flags&IFF_POINTOPOINT)
2017                                         plen = 64;
2018                                 else
2019                                         plen = 96;
2020
2021                                 ifp = ipv6_add_addr(idev, &addr, plen, flag,
2022                                                     IFA_F_PERMANENT);
2023                                 if (!IS_ERR(ifp)) {
2024                                         spin_lock_bh(&ifp->lock);
2025                                         ifp->flags &= ~IFA_F_TENTATIVE;
2026                                         spin_unlock_bh(&ifp->lock);
2027                                         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2028                                         in6_ifa_put(ifp);
2029                                 }
2030                         }
2031                 }
2032         }
2033 }
2034 #endif
2035
2036 static void init_loopback(struct net_device *dev)
2037 {
2038         struct inet6_dev  *idev;
2039         struct inet6_ifaddr * ifp;
2040
2041         /* ::1 */
2042
2043         ASSERT_RTNL();
2044
2045         if ((idev = ipv6_find_idev(dev)) == NULL) {
2046                 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2047                 return;
2048         }
2049
2050         ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
2051         if (!IS_ERR(ifp)) {
2052                 spin_lock_bh(&ifp->lock);
2053                 ifp->flags &= ~IFA_F_TENTATIVE;
2054                 spin_unlock_bh(&ifp->lock);
2055                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2056                 in6_ifa_put(ifp);
2057         }
2058 }
2059
2060 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2061 {
2062         struct inet6_ifaddr * ifp;
2063
2064         ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, IFA_F_PERMANENT);
2065         if (!IS_ERR(ifp)) {
2066                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2067                 addrconf_dad_start(ifp, 0);
2068                 in6_ifa_put(ifp);
2069         }
2070 }
2071
2072 static void addrconf_dev_config(struct net_device *dev)
2073 {
2074         struct in6_addr addr;
2075         struct inet6_dev    * idev;
2076
2077         ASSERT_RTNL();
2078
2079         if ((dev->type != ARPHRD_ETHER) &&
2080             (dev->type != ARPHRD_FDDI) &&
2081             (dev->type != ARPHRD_IEEE802_TR) &&
2082             (dev->type != ARPHRD_ARCNET) &&
2083             (dev->type != ARPHRD_INFINIBAND)) {
2084                 /* Alas, we support only Ethernet autoconfiguration. */
2085                 return;
2086         }
2087
2088         idev = addrconf_add_dev(dev);
2089         if (idev == NULL)
2090                 return;
2091
2092         memset(&addr, 0, sizeof(struct in6_addr));
2093         addr.s6_addr32[0] = htonl(0xFE800000);
2094
2095         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2096                 addrconf_add_linklocal(idev, &addr);
2097 }
2098
2099 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2100 static void addrconf_sit_config(struct net_device *dev)
2101 {
2102         struct inet6_dev *idev;
2103
2104         ASSERT_RTNL();
2105
2106         /*
2107          * Configure the tunnel with one of our IPv4
2108          * addresses... we should configure all of
2109          * our v4 addrs in the tunnel
2110          */
2111
2112         if ((idev = ipv6_find_idev(dev)) == NULL) {
2113                 printk(KERN_DEBUG "init sit: add_dev failed\n");
2114                 return;
2115         }
2116
2117         sit_add_v4_addrs(idev);
2118
2119         if (dev->flags&IFF_POINTOPOINT) {
2120                 addrconf_add_mroute(dev);
2121                 addrconf_add_lroute(dev);
2122         } else
2123                 sit_route_add(dev);
2124 }
2125 #endif
2126
2127 static inline int
2128 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2129 {
2130         struct in6_addr lladdr;
2131
2132         if (!ipv6_get_lladdr(link_dev, &lladdr)) {
2133                 addrconf_add_linklocal(idev, &lladdr);
2134                 return 0;
2135         }
2136         return -1;
2137 }
2138
2139 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2140 {
2141         struct net_device *link_dev;
2142
2143         /* first try to inherit the link-local address from the link device */
2144         if (idev->dev->iflink &&
2145             (link_dev = __dev_get_by_index(idev->dev->iflink))) {
2146                 if (!ipv6_inherit_linklocal(idev, link_dev))
2147                         return;
2148         }
2149         /* then try to inherit it from any device */
2150         for (link_dev = dev_base; link_dev; link_dev = link_dev->next) {
2151                 if (!ipv6_inherit_linklocal(idev, link_dev))
2152                         return;
2153         }
2154         printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2155 }
2156
2157 /*
2158  * Autoconfigure tunnel with a link-local address so routing protocols,
2159  * DHCPv6, MLD etc. can be run over the virtual link
2160  */
2161
2162 static void addrconf_ip6_tnl_config(struct net_device *dev)
2163 {
2164         struct inet6_dev *idev;
2165
2166         ASSERT_RTNL();
2167
2168         if ((idev = addrconf_add_dev(dev)) == NULL) {
2169                 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2170                 return;
2171         }
2172         ip6_tnl_add_linklocal(idev);
2173 }
2174
2175 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2176                            void * data)
2177 {
2178         struct net_device *dev = (struct net_device *) data;
2179         struct inet6_dev *idev = __in6_dev_get(dev);
2180         int run_pending = 0;
2181
2182         switch(event) {
2183         case NETDEV_REGISTER:
2184                 if (!idev) {
2185                         idev = ipv6_add_dev(dev);
2186                         if (!idev)
2187                                 printk(KERN_WARNING "IPv6: add_dev failed for %s\n",
2188                                         dev->name);
2189                 }
2190                 break;
2191         case NETDEV_UP:
2192         case NETDEV_CHANGE:
2193                 if (event == NETDEV_UP) {
2194                         if (!netif_carrier_ok(dev)) {
2195                                 /* device is not ready yet. */
2196                                 printk(KERN_INFO
2197                                         "ADDRCONF(NETDEV_UP): %s: "
2198                                         "link is not ready\n",
2199                                         dev->name);
2200                                 break;
2201                         }
2202
2203                         if (idev)
2204                                 idev->if_flags |= IF_READY;
2205                 } else {
2206                         if (!netif_carrier_ok(dev)) {
2207                                 /* device is still not ready. */
2208                                 break;
2209                         }
2210
2211                         if (idev) {
2212                                 if (idev->if_flags & IF_READY) {
2213                                         /* device is already configured. */
2214                                         break;
2215                                 }
2216                                 idev->if_flags |= IF_READY;
2217                         }
2218
2219                         printk(KERN_INFO
2220                                         "ADDRCONF(NETDEV_CHANGE): %s: "
2221                                         "link becomes ready\n",
2222                                         dev->name);
2223
2224                         run_pending = 1;
2225                 }
2226
2227                 switch(dev->type) {
2228 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2229                 case ARPHRD_SIT:
2230                         addrconf_sit_config(dev);
2231                         break;
2232 #endif
2233                 case ARPHRD_TUNNEL6:
2234                         addrconf_ip6_tnl_config(dev);
2235                         break;
2236                 case ARPHRD_LOOPBACK:
2237                         init_loopback(dev);
2238                         break;
2239
2240                 default:
2241                         addrconf_dev_config(dev);
2242                         break;
2243                 };
2244                 if (idev) {
2245                         if (run_pending)
2246                                 addrconf_dad_run(idev);
2247
2248                         /* If the MTU changed during the interface down, when the
2249                            interface up, the changed MTU must be reflected in the
2250                            idev as well as routers.
2251                          */
2252                         if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2253                                 rt6_mtu_change(dev, dev->mtu);
2254                                 idev->cnf.mtu6 = dev->mtu;
2255                         }
2256                         idev->tstamp = jiffies;
2257                         inet6_ifinfo_notify(RTM_NEWLINK, idev);
2258                         /* If the changed mtu during down is lower than IPV6_MIN_MTU
2259                            stop IPv6 on this interface.
2260                          */
2261                         if (dev->mtu < IPV6_MIN_MTU)
2262                                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2263                 }
2264                 break;
2265
2266         case NETDEV_CHANGEMTU:
2267                 if ( idev && dev->mtu >= IPV6_MIN_MTU) {
2268                         rt6_mtu_change(dev, dev->mtu);
2269                         idev->cnf.mtu6 = dev->mtu;
2270                         break;
2271                 }
2272
2273                 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2274
2275         case NETDEV_DOWN:
2276         case NETDEV_UNREGISTER:
2277                 /*
2278                  *      Remove all addresses from this interface.
2279                  */
2280                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2281                 break;
2282
2283         case NETDEV_CHANGENAME:
2284 #ifdef CONFIG_SYSCTL
2285                 if (idev) {
2286                         addrconf_sysctl_unregister(&idev->cnf);
2287                         neigh_sysctl_unregister(idev->nd_parms);
2288                         neigh_sysctl_register(dev, idev->nd_parms,
2289                                               NET_IPV6, NET_IPV6_NEIGH, "ipv6",
2290                                               &ndisc_ifinfo_sysctl_change,
2291                                               NULL);
2292                         addrconf_sysctl_register(idev, &idev->cnf);
2293                 }
2294 #endif
2295                 break;
2296         };
2297
2298         return NOTIFY_OK;
2299 }
2300
2301 /*
2302  *      addrconf module should be notified of a device going up
2303  */
2304 static struct notifier_block ipv6_dev_notf = {
2305         .notifier_call = addrconf_notify,
2306         .priority = 0
2307 };
2308
2309 static int addrconf_ifdown(struct net_device *dev, int how)
2310 {
2311         struct inet6_dev *idev;
2312         struct inet6_ifaddr *ifa, **bifa;
2313         int i;
2314
2315         ASSERT_RTNL();
2316
2317         if (dev == &loopback_dev && how == 1)
2318                 how = 0;
2319
2320         rt6_ifdown(dev);
2321         neigh_ifdown(&nd_tbl, dev);
2322
2323         idev = __in6_dev_get(dev);
2324         if (idev == NULL)
2325                 return -ENODEV;
2326
2327         /* Step 1: remove reference to ipv6 device from parent device.
2328                    Do not dev_put!
2329          */
2330         if (how == 1) {
2331                 idev->dead = 1;
2332
2333                 /* protected by rtnl_lock */
2334                 rcu_assign_pointer(dev->ip6_ptr, NULL);
2335
2336                 /* Step 1.5: remove snmp6 entry */
2337                 snmp6_unregister_dev(idev);
2338
2339         }
2340
2341         /* Step 2: clear hash table */
2342         for (i=0; i<IN6_ADDR_HSIZE; i++) {
2343                 bifa = &inet6_addr_lst[i];
2344
2345                 write_lock_bh(&addrconf_hash_lock);
2346                 while ((ifa = *bifa) != NULL) {
2347                         if (ifa->idev == idev) {
2348                                 *bifa = ifa->lst_next;
2349                                 ifa->lst_next = NULL;
2350                                 addrconf_del_timer(ifa);
2351                                 in6_ifa_put(ifa);
2352                                 continue;
2353                         }
2354                         bifa = &ifa->lst_next;
2355                 }
2356                 write_unlock_bh(&addrconf_hash_lock);
2357         }
2358
2359         write_lock_bh(&idev->lock);
2360
2361         /* Step 3: clear flags for stateless addrconf */
2362         if (how != 1)
2363                 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2364
2365         /* Step 4: clear address list */
2366 #ifdef CONFIG_IPV6_PRIVACY
2367         if (how == 1 && del_timer(&idev->regen_timer))
2368                 in6_dev_put(idev);
2369
2370         /* clear tempaddr list */
2371         while ((ifa = idev->tempaddr_list) != NULL) {
2372                 idev->tempaddr_list = ifa->tmp_next;
2373                 ifa->tmp_next = NULL;
2374                 ifa->dead = 1;
2375                 write_unlock_bh(&idev->lock);
2376                 spin_lock_bh(&ifa->lock);
2377
2378                 if (ifa->ifpub) {
2379                         in6_ifa_put(ifa->ifpub);
2380                         ifa->ifpub = NULL;
2381                 }
2382                 spin_unlock_bh(&ifa->lock);
2383                 in6_ifa_put(ifa);
2384                 write_lock_bh(&idev->lock);
2385         }
2386 #endif
2387         while ((ifa = idev->addr_list) != NULL) {
2388                 idev->addr_list = ifa->if_next;
2389                 ifa->if_next = NULL;
2390                 ifa->dead = 1;
2391                 addrconf_del_timer(ifa);
2392                 write_unlock_bh(&idev->lock);
2393
2394                 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2395                 in6_ifa_put(ifa);
2396
2397                 write_lock_bh(&idev->lock);
2398         }
2399         write_unlock_bh(&idev->lock);
2400
2401         /* Step 5: Discard multicast list */
2402
2403         if (how == 1)
2404                 ipv6_mc_destroy_dev(idev);
2405         else
2406                 ipv6_mc_down(idev);
2407
2408         /* Step 5: netlink notification of this interface */
2409         idev->tstamp = jiffies;
2410         inet6_ifinfo_notify(RTM_DELLINK, idev);
2411
2412         /* Shot the device (if unregistered) */
2413
2414         if (how == 1) {
2415 #ifdef CONFIG_SYSCTL
2416                 addrconf_sysctl_unregister(&idev->cnf);
2417                 neigh_sysctl_unregister(idev->nd_parms);
2418 #endif
2419                 neigh_parms_release(&nd_tbl, idev->nd_parms);
2420                 neigh_ifdown(&nd_tbl, dev);
2421                 in6_dev_put(idev);
2422         }
2423         return 0;
2424 }
2425
2426 static void addrconf_rs_timer(unsigned long data)
2427 {
2428         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2429
2430         if (ifp->idev->cnf.forwarding)
2431                 goto out;
2432
2433         if (ifp->idev->if_flags & IF_RA_RCVD) {
2434                 /*
2435                  *      Announcement received after solicitation
2436                  *      was sent
2437                  */
2438                 goto out;
2439         }
2440
2441         spin_lock(&ifp->lock);
2442         if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2443                 struct in6_addr all_routers;
2444
2445                 /* The wait after the last probe can be shorter */
2446                 addrconf_mod_timer(ifp, AC_RS,
2447                                    (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2448                                    ifp->idev->cnf.rtr_solicit_delay :
2449                                    ifp->idev->cnf.rtr_solicit_interval);
2450                 spin_unlock(&ifp->lock);
2451
2452                 ipv6_addr_all_routers(&all_routers);
2453
2454                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2455         } else {
2456                 spin_unlock(&ifp->lock);
2457                 /*
2458                  * Note: we do not support deprecated "all on-link"
2459                  * assumption any longer.
2460                  */
2461                 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2462                        ifp->idev->dev->name);
2463         }
2464
2465 out:
2466         in6_ifa_put(ifp);
2467 }
2468
2469 /*
2470  *      Duplicate Address Detection
2471  */
2472 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2473 {
2474         unsigned long rand_num;
2475         struct inet6_dev *idev = ifp->idev;
2476
2477         rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2478         ifp->probes = idev->cnf.dad_transmits;
2479         addrconf_mod_timer(ifp, AC_DAD, rand_num);
2480 }
2481
2482 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2483 {
2484         struct inet6_dev *idev = ifp->idev;
2485         struct net_device *dev = idev->dev;
2486
2487         addrconf_join_solict(dev, &ifp->addr);
2488
2489         net_srandom(ifp->addr.s6_addr32[3]);
2490
2491         read_lock_bh(&idev->lock);
2492         if (ifp->dead)
2493                 goto out;
2494         spin_lock_bh(&ifp->lock);
2495
2496         if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2497             !(ifp->flags&IFA_F_TENTATIVE) ||
2498             ifp->flags & IFA_F_NODAD) {
2499                 ifp->flags &= ~IFA_F_TENTATIVE;
2500                 spin_unlock_bh(&ifp->lock);
2501                 read_unlock_bh(&idev->lock);
2502
2503                 addrconf_dad_completed(ifp);
2504                 return;
2505         }
2506
2507         if (!(idev->if_flags & IF_READY)) {
2508                 spin_unlock_bh(&ifp->lock);
2509                 read_unlock_bh(&idev->lock);
2510                 /*
2511                  * If the defice is not ready:
2512                  * - keep it tentative if it is a permanent address.
2513                  * - otherwise, kill it.
2514                  */
2515                 in6_ifa_hold(ifp);
2516                 addrconf_dad_stop(ifp);
2517                 return;
2518         }
2519         addrconf_dad_kick(ifp);
2520         spin_unlock_bh(&ifp->lock);
2521 out:
2522         read_unlock_bh(&idev->lock);
2523 }
2524
2525 static void addrconf_dad_timer(unsigned long data)
2526 {
2527         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2528         struct inet6_dev *idev = ifp->idev;
2529         struct in6_addr unspec;
2530         struct in6_addr mcaddr;
2531
2532         read_lock_bh(&idev->lock);
2533         if (idev->dead) {
2534                 read_unlock_bh(&idev->lock);
2535                 goto out;
2536         }
2537         spin_lock_bh(&ifp->lock);
2538         if (ifp->probes == 0) {
2539                 /*
2540                  * DAD was successful
2541                  */
2542
2543                 ifp->flags &= ~IFA_F_TENTATIVE;
2544                 spin_unlock_bh(&ifp->lock);
2545                 read_unlock_bh(&idev->lock);
2546
2547                 addrconf_dad_completed(ifp);
2548
2549                 goto out;
2550         }
2551
2552         ifp->probes--;
2553         addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2554         spin_unlock_bh(&ifp->lock);
2555         read_unlock_bh(&idev->lock);
2556
2557         /* send a neighbour solicitation for our addr */
2558         memset(&unspec, 0, sizeof(unspec));
2559         addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2560         ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec);
2561 out:
2562         in6_ifa_put(ifp);
2563 }
2564
2565 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2566 {
2567         struct net_device *     dev = ifp->idev->dev;
2568
2569         /*
2570          *      Configure the address for reception. Now it is valid.
2571          */
2572
2573         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2574
2575         /* If added prefix is link local and forwarding is off,
2576            start sending router solicitations.
2577          */
2578
2579         if (ifp->idev->cnf.forwarding == 0 &&
2580             ifp->idev->cnf.rtr_solicits > 0 &&
2581             (dev->flags&IFF_LOOPBACK) == 0 &&
2582             (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2583                 struct in6_addr all_routers;
2584
2585                 ipv6_addr_all_routers(&all_routers);
2586
2587                 /*
2588                  *      If a host as already performed a random delay
2589                  *      [...] as part of DAD [...] there is no need
2590                  *      to delay again before sending the first RS
2591                  */
2592                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2593
2594                 spin_lock_bh(&ifp->lock);
2595                 ifp->probes = 1;
2596                 ifp->idev->if_flags |= IF_RS_SENT;
2597                 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2598                 spin_unlock_bh(&ifp->lock);
2599         }
2600 }
2601
2602 static void addrconf_dad_run(struct inet6_dev *idev) {
2603         struct inet6_ifaddr *ifp;
2604
2605         read_lock_bh(&idev->lock);
2606         for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2607                 spin_lock_bh(&ifp->lock);
2608                 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2609                         spin_unlock_bh(&ifp->lock);
2610                         continue;
2611                 }
2612                 spin_unlock_bh(&ifp->lock);
2613                 addrconf_dad_kick(ifp);
2614         }
2615         read_unlock_bh(&idev->lock);
2616 }
2617
2618 #ifdef CONFIG_PROC_FS
2619 struct if6_iter_state {
2620         int bucket;
2621 };
2622
2623 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2624 {
2625         struct inet6_ifaddr *ifa = NULL;
2626         struct if6_iter_state *state = seq->private;
2627
2628         for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2629                 ifa = inet6_addr_lst[state->bucket];
2630                 if (ifa)
2631                         break;
2632         }
2633         return ifa;
2634 }
2635
2636 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2637 {
2638         struct if6_iter_state *state = seq->private;
2639
2640         ifa = ifa->lst_next;
2641 try_again:
2642         if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2643                 ifa = inet6_addr_lst[state->bucket];
2644                 goto try_again;
2645         }
2646         return ifa;
2647 }
2648
2649 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2650 {
2651         struct inet6_ifaddr *ifa = if6_get_first(seq);
2652
2653         if (ifa)
2654                 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2655                         --pos;
2656         return pos ? NULL : ifa;
2657 }
2658
2659 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2660 {
2661         read_lock_bh(&addrconf_hash_lock);
2662         return if6_get_idx(seq, *pos);
2663 }
2664
2665 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2666 {
2667         struct inet6_ifaddr *ifa;
2668
2669         ifa = if6_get_next(seq, v);
2670         ++*pos;
2671         return ifa;
2672 }
2673
2674 static void if6_seq_stop(struct seq_file *seq, void *v)
2675 {
2676         read_unlock_bh(&addrconf_hash_lock);
2677 }
2678
2679 static int if6_seq_show(struct seq_file *seq, void *v)
2680 {
2681         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2682         seq_printf(seq,
2683                    NIP6_SEQFMT " %02x %02x %02x %02x %8s\n",
2684                    NIP6(ifp->addr),
2685                    ifp->idev->dev->ifindex,
2686                    ifp->prefix_len,
2687                    ifp->scope,
2688                    ifp->flags,
2689                    ifp->idev->dev->name);
2690         return 0;
2691 }
2692
2693 static struct seq_operations if6_seq_ops = {
2694         .start  = if6_seq_start,
2695         .next   = if6_seq_next,
2696         .show   = if6_seq_show,
2697         .stop   = if6_seq_stop,
2698 };
2699
2700 static int if6_seq_open(struct inode *inode, struct file *file)
2701 {
2702         struct seq_file *seq;
2703         int rc = -ENOMEM;
2704         struct if6_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL);
2705
2706         if (!s)
2707                 goto out;
2708
2709         rc = seq_open(file, &if6_seq_ops);
2710         if (rc)
2711                 goto out_kfree;
2712
2713         seq = file->private_data;
2714         seq->private = s;
2715 out:
2716         return rc;
2717 out_kfree:
2718         kfree(s);
2719         goto out;
2720 }
2721
2722 static const struct file_operations if6_fops = {
2723         .owner          = THIS_MODULE,
2724         .open           = if6_seq_open,
2725         .read           = seq_read,
2726         .llseek         = seq_lseek,
2727         .release        = seq_release_private,
2728 };
2729
2730 int __init if6_proc_init(void)
2731 {
2732         if (!proc_net_fops_create("if_inet6", S_IRUGO, &if6_fops))
2733                 return -ENOMEM;
2734         return 0;
2735 }
2736
2737 void if6_proc_exit(void)
2738 {
2739         proc_net_remove("if_inet6");
2740 }
2741 #endif  /* CONFIG_PROC_FS */
2742
2743 #ifdef CONFIG_IPV6_MIP6
2744 /* Check if address is a home address configured on any interface. */
2745 int ipv6_chk_home_addr(struct in6_addr *addr)
2746 {
2747         int ret = 0;
2748         struct inet6_ifaddr * ifp;
2749         u8 hash = ipv6_addr_hash(addr);
2750         read_lock_bh(&addrconf_hash_lock);
2751         for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) {
2752                 if (ipv6_addr_cmp(&ifp->addr, addr) == 0 &&
2753                     (ifp->flags & IFA_F_HOMEADDRESS)) {
2754                         ret = 1;
2755                         break;
2756                 }
2757         }
2758         read_unlock_bh(&addrconf_hash_lock);
2759         return ret;
2760 }
2761 #endif
2762
2763 /*
2764  *      Periodic address status verification
2765  */
2766
2767 static void addrconf_verify(unsigned long foo)
2768 {
2769         struct inet6_ifaddr *ifp;
2770         unsigned long now, next;
2771         int i;
2772
2773         spin_lock_bh(&addrconf_verify_lock);
2774         now = jiffies;
2775         next = now + ADDR_CHECK_FREQUENCY;
2776
2777         del_timer(&addr_chk_timer);
2778
2779         for (i=0; i < IN6_ADDR_HSIZE; i++) {
2780
2781 restart:
2782                 read_lock(&addrconf_hash_lock);
2783                 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
2784                         unsigned long age;
2785 #ifdef CONFIG_IPV6_PRIVACY
2786                         unsigned long regen_advance;
2787 #endif
2788
2789                         if (ifp->flags & IFA_F_PERMANENT)
2790                                 continue;
2791
2792                         spin_lock(&ifp->lock);
2793                         age = (now - ifp->tstamp) / HZ;
2794
2795 #ifdef CONFIG_IPV6_PRIVACY
2796                         regen_advance = ifp->idev->cnf.regen_max_retry *
2797                                         ifp->idev->cnf.dad_transmits *
2798                                         ifp->idev->nd_parms->retrans_time / HZ;
2799 #endif
2800
2801                         if (ifp->valid_lft != INFINITY_LIFE_TIME &&
2802                             age >= ifp->valid_lft) {
2803                                 spin_unlock(&ifp->lock);
2804                                 in6_ifa_hold(ifp);
2805                                 read_unlock(&addrconf_hash_lock);
2806                                 ipv6_del_addr(ifp);
2807                                 goto restart;
2808                         } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
2809                                 spin_unlock(&ifp->lock);
2810                                 continue;
2811                         } else if (age >= ifp->prefered_lft) {
2812                                 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
2813                                 int deprecate = 0;
2814
2815                                 if (!(ifp->flags&IFA_F_DEPRECATED)) {
2816                                         deprecate = 1;
2817                                         ifp->flags |= IFA_F_DEPRECATED;
2818                                 }
2819
2820                                 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
2821                                         next = ifp->tstamp + ifp->valid_lft * HZ;
2822
2823                                 spin_unlock(&ifp->lock);
2824
2825                                 if (deprecate) {
2826                                         in6_ifa_hold(ifp);
2827                                         read_unlock(&addrconf_hash_lock);
2828
2829                                         ipv6_ifa_notify(0, ifp);
2830                                         in6_ifa_put(ifp);
2831                                         goto restart;
2832                                 }
2833 #ifdef CONFIG_IPV6_PRIVACY
2834                         } else if ((ifp->flags&IFA_F_TEMPORARY) &&
2835                                    !(ifp->flags&IFA_F_TENTATIVE)) {
2836                                 if (age >= ifp->prefered_lft - regen_advance) {
2837                                         struct inet6_ifaddr *ifpub = ifp->ifpub;
2838                                         if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2839                                                 next = ifp->tstamp + ifp->prefered_lft * HZ;
2840                                         if (!ifp->regen_count && ifpub) {
2841                                                 ifp->regen_count++;
2842                                                 in6_ifa_hold(ifp);
2843                                                 in6_ifa_hold(ifpub);
2844                                                 spin_unlock(&ifp->lock);
2845                                                 read_unlock(&addrconf_hash_lock);
2846                                                 spin_lock(&ifpub->lock);
2847                                                 ifpub->regen_count = 0;
2848                                                 spin_unlock(&ifpub->lock);
2849                                                 ipv6_create_tempaddr(ifpub, ifp);
2850                                                 in6_ifa_put(ifpub);
2851                                                 in6_ifa_put(ifp);
2852                                                 goto restart;
2853                                         }
2854                                 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
2855                                         next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
2856                                 spin_unlock(&ifp->lock);
2857 #endif
2858                         } else {
2859                                 /* ifp->prefered_lft <= ifp->valid_lft */
2860                                 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2861                                         next = ifp->tstamp + ifp->prefered_lft * HZ;
2862                                 spin_unlock(&ifp->lock);
2863                         }
2864                 }
2865                 read_unlock(&addrconf_hash_lock);
2866         }
2867
2868         addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
2869         add_timer(&addr_chk_timer);
2870         spin_unlock_bh(&addrconf_verify_lock);
2871 }
2872
2873 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
2874 {
2875         struct in6_addr *pfx = NULL;
2876
2877         if (addr)
2878                 pfx = nla_data(addr);
2879
2880         if (local) {
2881                 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
2882                         pfx = NULL;
2883                 else
2884                         pfx = nla_data(local);
2885         }
2886
2887         return pfx;
2888 }
2889
2890 static struct nla_policy ifa_ipv6_policy[IFA_MAX+1] __read_mostly = {
2891         [IFA_ADDRESS]           = { .len = sizeof(struct in6_addr) },
2892         [IFA_LOCAL]             = { .len = sizeof(struct in6_addr) },
2893         [IFA_CACHEINFO]         = { .len = sizeof(struct ifa_cacheinfo) },
2894 };
2895
2896 static int
2897 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
2898 {
2899         struct ifaddrmsg *ifm;
2900         struct nlattr *tb[IFA_MAX+1];
2901         struct in6_addr *pfx;
2902         int err;
2903
2904         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
2905         if (err < 0)
2906                 return err;
2907
2908         ifm = nlmsg_data(nlh);
2909         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
2910         if (pfx == NULL)
2911                 return -EINVAL;
2912
2913         return inet6_addr_del(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
2914 }
2915
2916 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
2917                              u32 prefered_lft, u32 valid_lft)
2918 {
2919         u32 flags = RTF_EXPIRES;
2920
2921         if (!valid_lft || (prefered_lft > valid_lft))
2922                 return -EINVAL;
2923
2924         if (valid_lft == INFINITY_LIFE_TIME) {
2925                 ifa_flags |= IFA_F_PERMANENT;
2926                 flags = 0;
2927         } else if (valid_lft >= 0x7FFFFFFF/HZ)
2928                 valid_lft = 0x7FFFFFFF/HZ;
2929
2930         if (prefered_lft == 0)
2931                 ifa_flags |= IFA_F_DEPRECATED;
2932         else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
2933                  (prefered_lft != INFINITY_LIFE_TIME))
2934                 prefered_lft = 0x7FFFFFFF/HZ;
2935
2936         spin_lock_bh(&ifp->lock);
2937         ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
2938         ifp->tstamp = jiffies;
2939         ifp->valid_lft = valid_lft;
2940         ifp->prefered_lft = prefered_lft;
2941
2942         spin_unlock_bh(&ifp->lock);
2943         if (!(ifp->flags&IFA_F_TENTATIVE))
2944                 ipv6_ifa_notify(0, ifp);
2945
2946         addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
2947                               jiffies_to_clock_t(valid_lft * HZ), flags);
2948         addrconf_verify(0);
2949
2950         return 0;
2951 }
2952
2953 static int
2954 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
2955 {
2956         struct ifaddrmsg *ifm;
2957         struct nlattr *tb[IFA_MAX+1];
2958         struct in6_addr *pfx;
2959         struct inet6_ifaddr *ifa;
2960         struct net_device *dev;
2961         u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
2962         u8 ifa_flags;
2963         int err;
2964
2965         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
2966         if (err < 0)
2967                 return err;
2968
2969         ifm = nlmsg_data(nlh);
2970         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
2971         if (pfx == NULL)
2972                 return -EINVAL;
2973
2974         if (tb[IFA_CACHEINFO]) {
2975                 struct ifa_cacheinfo *ci;
2976
2977                 ci = nla_data(tb[IFA_CACHEINFO]);
2978                 valid_lft = ci->ifa_valid;
2979                 preferred_lft = ci->ifa_prefered;
2980         } else {
2981                 preferred_lft = INFINITY_LIFE_TIME;
2982                 valid_lft = INFINITY_LIFE_TIME;
2983         }
2984
2985         dev =  __dev_get_by_index(ifm->ifa_index);
2986         if (dev == NULL)
2987                 return -ENODEV;
2988
2989         /* We ignore other flags so far. */
2990         ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
2991
2992         ifa = ipv6_get_ifaddr(pfx, dev, 1);
2993         if (ifa == NULL) {
2994                 /*
2995                  * It would be best to check for !NLM_F_CREATE here but
2996                  * userspace alreay relies on not having to provide this.
2997                  */
2998                 return inet6_addr_add(ifm->ifa_index, pfx, ifm->ifa_prefixlen,
2999                                       ifa_flags, preferred_lft, valid_lft);
3000         }
3001
3002         if (nlh->nlmsg_flags & NLM_F_EXCL ||
3003             !(nlh->nlmsg_flags & NLM_F_REPLACE))
3004                 err = -EEXIST;
3005         else
3006                 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3007
3008         in6_ifa_put(ifa);
3009
3010         return err;
3011 }
3012
3013 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3014                           u8 scope, int ifindex)
3015 {
3016         struct ifaddrmsg *ifm;
3017
3018         ifm = nlmsg_data(nlh);
3019         ifm->ifa_family = AF_INET6;
3020         ifm->ifa_prefixlen = prefixlen;
3021         ifm->ifa_flags = flags;
3022         ifm->ifa_scope = scope;
3023         ifm->ifa_index = ifindex;
3024 }
3025
3026 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3027                          unsigned long tstamp, u32 preferred, u32 valid)
3028 {
3029         struct ifa_cacheinfo ci;
3030
3031         ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3032                         + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3033         ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3034                         + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3035         ci.ifa_prefered = preferred;
3036         ci.ifa_valid = valid;
3037
3038         return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3039 }
3040
3041 static inline int rt_scope(int ifa_scope)
3042 {
3043         if (ifa_scope & IFA_HOST)
3044                 return RT_SCOPE_HOST;
3045         else if (ifa_scope & IFA_LINK)
3046                 return RT_SCOPE_LINK;
3047         else if (ifa_scope & IFA_SITE)
3048                 return RT_SCOPE_SITE;
3049         else
3050                 return RT_SCOPE_UNIVERSE;
3051 }
3052
3053 static inline int inet6_ifaddr_msgsize(void)
3054 {
3055         return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3056                + nla_total_size(16) /* IFA_ADDRESS */
3057                + nla_total_size(sizeof(struct ifa_cacheinfo));
3058 }
3059
3060 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3061                              u32 pid, u32 seq, int event, unsigned int flags)
3062 {
3063         struct nlmsghdr  *nlh;
3064         u32 preferred, valid;
3065
3066         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3067         if (nlh == NULL)
3068                 return -EMSGSIZE;
3069
3070         put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3071                       ifa->idev->dev->ifindex);
3072
3073         if (!(ifa->flags&IFA_F_PERMANENT)) {
3074                 preferred = ifa->prefered_lft;
3075                 valid = ifa->valid_lft;
3076                 if (preferred != INFINITY_LIFE_TIME) {
3077                         long tval = (jiffies - ifa->tstamp)/HZ;
3078                         preferred -= tval;
3079                         if (valid != INFINITY_LIFE_TIME)
3080                                 valid -= tval;
3081                 }
3082         } else {
3083                 preferred = INFINITY_LIFE_TIME;
3084                 valid = INFINITY_LIFE_TIME;
3085         }
3086
3087         if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3088             put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3089                 nlmsg_cancel(skb, nlh);
3090                 return -EMSGSIZE;
3091         }
3092
3093         return nlmsg_end(skb, nlh);
3094 }
3095
3096 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3097                                 u32 pid, u32 seq, int event, u16 flags)
3098 {
3099         struct nlmsghdr  *nlh;
3100         u8 scope = RT_SCOPE_UNIVERSE;
3101         int ifindex = ifmca->idev->dev->ifindex;
3102
3103         if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3104                 scope = RT_SCOPE_SITE;
3105
3106         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3107         if (nlh == NULL)
3108                 return -EMSGSIZE;
3109
3110         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3111         if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3112             put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3113                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3114                 nlmsg_cancel(skb, nlh);
3115                 return -EMSGSIZE;
3116         }
3117
3118         return nlmsg_end(skb, nlh);
3119 }
3120
3121 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3122                                 u32 pid, u32 seq, int event, unsigned int flags)
3123 {
3124         struct nlmsghdr  *nlh;
3125         u8 scope = RT_SCOPE_UNIVERSE;
3126         int ifindex = ifaca->aca_idev->dev->ifindex;
3127
3128         if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3129                 scope = RT_SCOPE_SITE;
3130
3131         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3132         if (nlh == NULL)
3133                 return -EMSGSIZE;
3134
3135         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3136         if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3137             put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3138                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3139                 nlmsg_cancel(skb, nlh);
3140                 return -EMSGSIZE;
3141         }
3142
3143         return nlmsg_end(skb, nlh);
3144 }
3145
3146 enum addr_type_t
3147 {
3148         UNICAST_ADDR,
3149         MULTICAST_ADDR,
3150         ANYCAST_ADDR,
3151 };
3152
3153 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3154                            enum addr_type_t type)
3155 {
3156         int idx, ip_idx;
3157         int s_idx, s_ip_idx;
3158         int err = 1;
3159         struct net_device *dev;
3160         struct inet6_dev *idev = NULL;
3161         struct inet6_ifaddr *ifa;
3162         struct ifmcaddr6 *ifmca;
3163         struct ifacaddr6 *ifaca;
3164
3165         s_idx = cb->args[0];
3166         s_ip_idx = ip_idx = cb->args[1];
3167         read_lock(&dev_base_lock);
3168
3169         for (dev = dev_base, idx = 0; dev; dev = dev->next, idx++) {
3170                 if (idx < s_idx)
3171                         continue;
3172                 if (idx > s_idx)
3173                         s_ip_idx = 0;
3174                 ip_idx = 0;
3175                 if ((idev = in6_dev_get(dev)) == NULL)
3176                         continue;
3177                 read_lock_bh(&idev->lock);
3178                 switch (type) {
3179                 case UNICAST_ADDR:
3180                         /* unicast address incl. temp addr */
3181                         for (ifa = idev->addr_list; ifa;
3182                              ifa = ifa->if_next, ip_idx++) {
3183                                 if (ip_idx < s_ip_idx)
3184                                         continue;
3185                                 if ((err = inet6_fill_ifaddr(skb, ifa,
3186                                     NETLINK_CB(cb->skb).pid,
3187                                     cb->nlh->nlmsg_seq, RTM_NEWADDR,
3188                                     NLM_F_MULTI)) <= 0)
3189                                         goto done;
3190                         }
3191                         break;
3192                 case MULTICAST_ADDR:
3193                         /* multicast address */
3194                         for (ifmca = idev->mc_list; ifmca;
3195                              ifmca = ifmca->next, ip_idx++) {
3196                                 if (ip_idx < s_ip_idx)
3197                                         continue;
3198                                 if ((err = inet6_fill_ifmcaddr(skb, ifmca,
3199                                     NETLINK_CB(cb->skb).pid,
3200                                     cb->nlh->nlmsg_seq, RTM_GETMULTICAST,
3201                                     NLM_F_MULTI)) <= 0)
3202                                         goto done;
3203                         }
3204                         break;
3205                 case ANYCAST_ADDR:
3206                         /* anycast address */
3207                         for (ifaca = idev->ac_list; ifaca;
3208                              ifaca = ifaca->aca_next, ip_idx++) {
3209                                 if (ip_idx < s_ip_idx)
3210                                         continue;
3211                                 if ((err = inet6_fill_ifacaddr(skb, ifaca,
3212                                     NETLINK_CB(cb->skb).pid,
3213                                     cb->nlh->nlmsg_seq, RTM_GETANYCAST,
3214                                     NLM_F_MULTI)) <= 0)
3215                                         goto done;
3216                         }
3217                         break;
3218                 default:
3219                         break;
3220                 }
3221                 read_unlock_bh(&idev->lock);
3222                 in6_dev_put(idev);
3223         }
3224 done:
3225         if (err <= 0) {
3226                 read_unlock_bh(&idev->lock);
3227                 in6_dev_put(idev);
3228         }
3229         read_unlock(&dev_base_lock);
3230         cb->args[0] = idx;
3231         cb->args[1] = ip_idx;
3232         return skb->len;
3233 }
3234
3235 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3236 {
3237         enum addr_type_t type = UNICAST_ADDR;
3238         return inet6_dump_addr(skb, cb, type);
3239 }
3240
3241 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3242 {
3243         enum addr_type_t type = MULTICAST_ADDR;
3244         return inet6_dump_addr(skb, cb, type);
3245 }
3246
3247
3248 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3249 {
3250         enum addr_type_t type = ANYCAST_ADDR;
3251         return inet6_dump_addr(skb, cb, type);
3252 }
3253
3254 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3255                              void *arg)
3256 {
3257         struct ifaddrmsg *ifm;
3258         struct nlattr *tb[IFA_MAX+1];
3259         struct in6_addr *addr = NULL;
3260         struct net_device *dev = NULL;
3261         struct inet6_ifaddr *ifa;
3262         struct sk_buff *skb;
3263         int err;
3264
3265         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3266         if (err < 0)
3267                 goto errout;
3268
3269         addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3270         if (addr == NULL) {
3271                 err = -EINVAL;
3272                 goto errout;
3273         }
3274
3275         ifm = nlmsg_data(nlh);
3276         if (ifm->ifa_index)
3277                 dev = __dev_get_by_index(ifm->ifa_index);
3278
3279         if ((ifa = ipv6_get_ifaddr(addr, dev, 1)) == NULL) {
3280                 err = -EADDRNOTAVAIL;
3281                 goto errout;
3282         }
3283
3284         if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) {
3285                 err = -ENOBUFS;
3286                 goto errout_ifa;
3287         }
3288
3289         err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3290                                 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3291         if (err < 0) {
3292                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3293                 WARN_ON(err == -EMSGSIZE);
3294                 kfree_skb(skb);
3295                 goto errout_ifa;
3296         }
3297         err = rtnl_unicast(skb, NETLINK_CB(in_skb).pid);
3298 errout_ifa:
3299         in6_ifa_put(ifa);
3300 errout:
3301         return err;
3302 }
3303
3304 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3305 {
3306         struct sk_buff *skb;
3307         int err = -ENOBUFS;
3308
3309         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3310         if (skb == NULL)
3311                 goto errout;
3312
3313         err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3314         if (err < 0) {
3315                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3316                 WARN_ON(err == -EMSGSIZE);
3317                 kfree_skb(skb);
3318                 goto errout;
3319         }
3320         err = rtnl_notify(skb, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3321 errout:
3322         if (err < 0)
3323                 rtnl_set_sk_err(RTNLGRP_IPV6_IFADDR, err);
3324 }
3325
3326 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3327                                 __s32 *array, int bytes)
3328 {
3329         BUG_ON(bytes < (DEVCONF_MAX * 4));
3330
3331         memset(array, 0, bytes);
3332         array[DEVCONF_FORWARDING] = cnf->forwarding;
3333         array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3334         array[DEVCONF_MTU6] = cnf->mtu6;
3335         array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3336         array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3337         array[DEVCONF_AUTOCONF] = cnf->autoconf;
3338         array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3339         array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3340         array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3341         array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3342         array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3343 #ifdef CONFIG_IPV6_PRIVACY
3344         array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3345         array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3346         array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3347         array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3348         array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3349 #endif
3350         array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3351         array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3352         array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3353 #ifdef CONFIG_IPV6_ROUTER_PREF
3354         array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3355         array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
3356 #ifdef CONFIG_IPV6_ROUTE_INFO
3357         array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3358 #endif
3359 #endif
3360         array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3361         array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3362 }
3363
3364 static inline size_t inet6_if_nlmsg_size(void)
3365 {
3366         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3367                + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3368                + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3369                + nla_total_size(4) /* IFLA_MTU */
3370                + nla_total_size(4) /* IFLA_LINK */
3371                + nla_total_size( /* IFLA_PROTINFO */
3372                         nla_total_size(4) /* IFLA_INET6_FLAGS */
3373                         + nla_total_size(sizeof(struct ifla_cacheinfo))
3374                         + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3375                  );
3376 }
3377
3378 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3379                              u32 pid, u32 seq, int event, unsigned int flags)
3380 {
3381         struct net_device *dev = idev->dev;
3382         struct nlattr *conf;
3383         struct ifinfomsg *hdr;
3384         struct nlmsghdr *nlh;
3385         void *protoinfo;
3386         struct ifla_cacheinfo ci;
3387
3388         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3389         if (nlh == NULL)
3390                 return -EMSGSIZE;
3391
3392         hdr = nlmsg_data(nlh);
3393         hdr->ifi_family = AF_INET6;
3394         hdr->__ifi_pad = 0;
3395         hdr->ifi_type = dev->type;
3396         hdr->ifi_index = dev->ifindex;
3397         hdr->ifi_flags = dev_get_flags(dev);
3398         hdr->ifi_change = 0;
3399
3400         NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
3401
3402         if (dev->addr_len)
3403                 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3404
3405         NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
3406         if (dev->ifindex != dev->iflink)
3407                 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
3408
3409         protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3410         if (protoinfo == NULL)
3411                 goto nla_put_failure;
3412
3413         NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
3414
3415         ci.max_reasm_len = IPV6_MAXPLEN;
3416         ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3417                     + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3418         ci.reachable_time = idev->nd_parms->reachable_time;
3419         ci.retrans_time = idev->nd_parms->retrans_time;
3420         NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3421
3422         conf = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3423         if (conf == NULL)
3424                 goto nla_put_failure;
3425         ipv6_store_devconf(&idev->cnf, nla_data(conf), nla_len(conf));
3426
3427         /* XXX - Statistics/MC not implemented */
3428
3429         nla_nest_end(skb, protoinfo);
3430         return nlmsg_end(skb, nlh);
3431
3432 nla_put_failure:
3433         nlmsg_cancel(skb, nlh);
3434         return -EMSGSIZE;
3435 }
3436
3437 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3438 {
3439         int idx, err;
3440         int s_idx = cb->args[0];
3441         struct net_device *dev;
3442         struct inet6_dev *idev;
3443
3444         read_lock(&dev_base_lock);
3445         for (dev=dev_base, idx=0; dev; dev = dev->next, idx++) {
3446                 if (idx < s_idx)
3447                         continue;
3448                 if ((idev = in6_dev_get(dev)) == NULL)
3449                         continue;
3450                 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
3451                                 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
3452                 in6_dev_put(idev);
3453                 if (err <= 0)
3454                         break;
3455         }
3456         read_unlock(&dev_base_lock);
3457         cb->args[0] = idx;
3458
3459         return skb->len;
3460 }
3461
3462 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3463 {
3464         struct sk_buff *skb;
3465         int err = -ENOBUFS;
3466
3467         skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
3468         if (skb == NULL)
3469                 goto errout;
3470
3471         err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
3472         if (err < 0) {
3473                 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3474                 WARN_ON(err == -EMSGSIZE);
3475                 kfree_skb(skb);
3476                 goto errout;
3477         }
3478         err = rtnl_notify(skb, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3479 errout:
3480         if (err < 0)
3481                 rtnl_set_sk_err(RTNLGRP_IPV6_IFADDR, err);
3482 }
3483
3484 static inline size_t inet6_prefix_nlmsg_size(void)
3485 {
3486         return NLMSG_ALIGN(sizeof(struct prefixmsg))
3487                + nla_total_size(sizeof(struct in6_addr))
3488                + nla_total_size(sizeof(struct prefix_cacheinfo));
3489 }
3490
3491 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
3492                              struct prefix_info *pinfo, u32 pid, u32 seq,
3493                              int event, unsigned int flags)
3494 {
3495         struct prefixmsg *pmsg;
3496         struct nlmsghdr *nlh;
3497         struct prefix_cacheinfo ci;
3498
3499         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
3500         if (nlh == NULL)
3501                 return -EMSGSIZE;
3502
3503         pmsg = nlmsg_data(nlh);
3504         pmsg->prefix_family = AF_INET6;
3505         pmsg->prefix_pad1 = 0;
3506         pmsg->prefix_pad2 = 0;
3507         pmsg->prefix_ifindex = idev->dev->ifindex;
3508         pmsg->prefix_len = pinfo->prefix_len;
3509         pmsg->prefix_type = pinfo->type;
3510         pmsg->prefix_pad3 = 0;
3511         pmsg->prefix_flags = 0;
3512         if (pinfo->onlink)
3513                 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3514         if (pinfo->autoconf)
3515                 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3516
3517         NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
3518
3519         ci.preferred_time = ntohl(pinfo->prefered);
3520         ci.valid_time = ntohl(pinfo->valid);
3521         NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
3522
3523         return nlmsg_end(skb, nlh);
3524
3525 nla_put_failure:
3526         nlmsg_cancel(skb, nlh);
3527         return -EMSGSIZE;
3528 }
3529
3530 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
3531                          struct prefix_info *pinfo)
3532 {
3533         struct sk_buff *skb;
3534         int err = -ENOBUFS;
3535
3536         skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
3537         if (skb == NULL)
3538                 goto errout;
3539
3540         err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
3541         if (err < 0) {
3542                 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
3543                 WARN_ON(err == -EMSGSIZE);
3544                 kfree_skb(skb);
3545                 goto errout;
3546         }
3547         err = rtnl_notify(skb, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
3548 errout:
3549         if (err < 0)
3550                 rtnl_set_sk_err(RTNLGRP_IPV6_PREFIX, err);
3551 }
3552
3553 static struct rtnetlink_link inet6_rtnetlink_table[RTM_NR_MSGTYPES] = {
3554         [RTM_GETLINK - RTM_BASE] = { .dumpit    = inet6_dump_ifinfo, },
3555         [RTM_NEWADDR - RTM_BASE] = { .doit      = inet6_rtm_newaddr, },
3556         [RTM_DELADDR - RTM_BASE] = { .doit      = inet6_rtm_deladdr, },
3557         [RTM_GETADDR - RTM_BASE] = { .doit      = inet6_rtm_getaddr,
3558                                      .dumpit    = inet6_dump_ifaddr, },
3559         [RTM_GETMULTICAST - RTM_BASE] = { .dumpit = inet6_dump_ifmcaddr, },
3560         [RTM_GETANYCAST - RTM_BASE] = { .dumpit = inet6_dump_ifacaddr, },
3561         [RTM_NEWROUTE - RTM_BASE] = { .doit     = inet6_rtm_newroute, },
3562         [RTM_DELROUTE - RTM_BASE] = { .doit     = inet6_rtm_delroute, },
3563         [RTM_GETROUTE - RTM_BASE] = { .doit     = inet6_rtm_getroute,
3564                                       .dumpit   = inet6_dump_fib, },
3565 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3566         [RTM_GETRULE  - RTM_BASE] = { .dumpit   = fib6_rules_dump,   },
3567 #endif
3568 };
3569
3570 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3571 {
3572         inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3573
3574         switch (event) {
3575         case RTM_NEWADDR:
3576                 ip6_ins_rt(ifp->rt);
3577                 if (ifp->idev->cnf.forwarding)
3578                         addrconf_join_anycast(ifp);
3579                 break;
3580         case RTM_DELADDR:
3581                 if (ifp->idev->cnf.forwarding)
3582                         addrconf_leave_anycast(ifp);
3583                 addrconf_leave_solict(ifp->idev, &ifp->addr);
3584                 dst_hold(&ifp->rt->u.dst);
3585                 if (ip6_del_rt(ifp->rt))
3586                         dst_free(&ifp->rt->u.dst);
3587                 break;
3588         }
3589 }
3590
3591 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3592 {
3593         rcu_read_lock_bh();
3594         if (likely(ifp->idev->dead == 0))
3595                 __ipv6_ifa_notify(event, ifp);
3596         rcu_read_unlock_bh();
3597 }
3598
3599 #ifdef CONFIG_SYSCTL
3600
3601 static
3602 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3603                            void __user *buffer, size_t *lenp, loff_t *ppos)
3604 {
3605         int *valp = ctl->data;
3606         int val = *valp;
3607         int ret;
3608
3609         ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3610
3611         if (write && valp != &ipv6_devconf_dflt.forwarding) {
3612                 if (valp != &ipv6_devconf.forwarding) {
3613                         if ((!*valp) ^ (!val)) {
3614                                 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
3615                                 if (idev == NULL)
3616                                         return ret;
3617                                 dev_forward_change(idev);
3618                         }
3619                 } else {
3620                         ipv6_devconf_dflt.forwarding = ipv6_devconf.forwarding;
3621                         addrconf_forward_change();
3622                 }
3623                 if (*valp)
3624                         rt6_purge_dflt_routers();
3625         }
3626
3627         return ret;
3628 }
3629
3630 static int addrconf_sysctl_forward_strategy(ctl_table *table,
3631                                             int __user *name, int nlen,
3632                                             void __user *oldval,
3633                                             size_t __user *oldlenp,
3634                                             void __user *newval, size_t newlen)
3635 {
3636         int *valp = table->data;
3637         int new;
3638
3639         if (!newval || !newlen)
3640                 return 0;
3641         if (newlen != sizeof(int))
3642                 return -EINVAL;
3643         if (get_user(new, (int __user *)newval))
3644                 return -EFAULT;
3645         if (new == *valp)
3646                 return 0;
3647         if (oldval && oldlenp) {
3648                 size_t len;
3649                 if (get_user(len, oldlenp))
3650                         return -EFAULT;
3651                 if (len) {
3652                         if (len > table->maxlen)
3653                                 len = table->maxlen;
3654                         if (copy_to_user(oldval, valp, len))
3655                                 return -EFAULT;
3656                         if (put_user(len, oldlenp))
3657                                 return -EFAULT;
3658                 }
3659         }
3660
3661         if (valp != &ipv6_devconf_dflt.forwarding) {
3662                 if (valp != &ipv6_devconf.forwarding) {
3663                         struct inet6_dev *idev = (struct inet6_dev *)table->extra1;
3664                         int changed;
3665                         if (unlikely(idev == NULL))
3666                                 return -ENODEV;
3667                         changed = (!*valp) ^ (!new);
3668                         *valp = new;
3669                         if (changed)
3670                                 dev_forward_change(idev);
3671                 } else {
3672                         *valp = new;
3673                         addrconf_forward_change();
3674                 }
3675
3676                 if (*valp)
3677                         rt6_purge_dflt_routers();
3678         } else
3679                 *valp = new;
3680
3681         return 1;
3682 }
3683
3684 static struct addrconf_sysctl_table
3685 {
3686         struct ctl_table_header *sysctl_header;
3687         ctl_table addrconf_vars[__NET_IPV6_MAX];
3688         ctl_table addrconf_dev[2];
3689         ctl_table addrconf_conf_dir[2];
3690         ctl_table addrconf_proto_dir[2];
3691         ctl_table addrconf_root_dir[2];
3692 } addrconf_sysctl __read_mostly = {
3693         .sysctl_header = NULL,
3694         .addrconf_vars = {
3695                 {
3696                         .ctl_name       =       NET_IPV6_FORWARDING,
3697                         .procname       =       "forwarding",
3698                         .data           =       &ipv6_devconf.forwarding,
3699                         .maxlen         =       sizeof(int),
3700                         .mode           =       0644,
3701                         .proc_handler   =       &addrconf_sysctl_forward,
3702                         .strategy       =       &addrconf_sysctl_forward_strategy,
3703                 },
3704                 {
3705                         .ctl_name       =       NET_IPV6_HOP_LIMIT,
3706                         .procname       =       "hop_limit",
3707                         .data           =       &ipv6_devconf.hop_limit,
3708                         .maxlen         =       sizeof(int),
3709                         .mode           =       0644,
3710                         .proc_handler   =       proc_dointvec,
3711                 },
3712                 {
3713                         .ctl_name       =       NET_IPV6_MTU,
3714                         .procname       =       "mtu",
3715                         .data           =       &ipv6_devconf.mtu6,
3716                         .maxlen         =       sizeof(int),
3717                         .mode           =       0644,
3718                         .proc_handler   =       &proc_dointvec,
3719                 },
3720                 {
3721                         .ctl_name       =       NET_IPV6_ACCEPT_RA,
3722                         .procname       =       "accept_ra",
3723                         .data           =       &ipv6_devconf.accept_ra,
3724                         .maxlen         =       sizeof(int),
3725                         .mode           =       0644,
3726                         .proc_handler   =       &proc_dointvec,
3727                 },
3728                 {
3729                         .ctl_name       =       NET_IPV6_ACCEPT_REDIRECTS,
3730                         .procname       =       "accept_redirects",
3731                         .data           =       &ipv6_devconf.accept_redirects,
3732                         .maxlen         =       sizeof(int),
3733                         .mode           =       0644,
3734                         .proc_handler   =       &proc_dointvec,
3735                 },
3736                 {
3737                         .ctl_name       =       NET_IPV6_AUTOCONF,
3738                         .procname       =       "autoconf",
3739                         .data           =       &ipv6_devconf.autoconf,
3740                         .maxlen         =       sizeof(int),
3741                         .mode           =       0644,
3742                         .proc_handler   =       &proc_dointvec,
3743                 },
3744                 {
3745                         .ctl_name       =       NET_IPV6_DAD_TRANSMITS,
3746                         .procname       =       "dad_transmits",
3747                         .data           =       &ipv6_devconf.dad_transmits,
3748                         .maxlen         =       sizeof(int),
3749                         .mode           =       0644,
3750                         .proc_handler   =       &proc_dointvec,
3751                 },
3752                 {
3753                         .ctl_name       =       NET_IPV6_RTR_SOLICITS,
3754                         .procname       =       "router_solicitations",
3755                         .data           =       &ipv6_devconf.rtr_solicits,
3756                         .maxlen         =       sizeof(int),
3757                         .mode           =       0644,
3758                         .proc_handler   =       &proc_dointvec,
3759                 },
3760                 {
3761                         .ctl_name       =       NET_IPV6_RTR_SOLICIT_INTERVAL,
3762                         .procname       =       "router_solicitation_interval",
3763                         .data           =       &ipv6_devconf.rtr_solicit_interval,
3764                         .maxlen         =       sizeof(int),
3765                         .mode           =       0644,
3766                         .proc_handler   =       &proc_dointvec_jiffies,
3767                         .strategy       =       &sysctl_jiffies,
3768                 },
3769                 {
3770                         .ctl_name       =      &n