[IPV6]: Address autoconfiguration does not work after device down/up cycle
[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/config.h>
44 #include <linux/errno.h>
45 #include <linux/types.h>
46 #include <linux/socket.h>
47 #include <linux/sockios.h>
48 #include <linux/sched.h>
49 #include <linux/net.h>
50 #include <linux/in6.h>
51 #include <linux/netdevice.h>
52 #include <linux/if_arp.h>
53 #include <linux/if_arcnet.h>
54 #include <linux/if_infiniband.h>
55 #include <linux/route.h>
56 #include <linux/inetdevice.h>
57 #include <linux/init.h>
58 #ifdef CONFIG_SYSCTL
59 #include <linux/sysctl.h>
60 #endif
61 #include <linux/capability.h>
62 #include <linux/delay.h>
63 #include <linux/notifier.h>
64 #include <linux/string.h>
65
66 #include <net/sock.h>
67 #include <net/snmp.h>
68
69 #include <net/ipv6.h>
70 #include <net/protocol.h>
71 #include <net/ndisc.h>
72 #include <net/ip6_route.h>
73 #include <net/addrconf.h>
74 #include <net/tcp.h>
75 #include <net/ip.h>
76 #include <linux/if_tunnel.h>
77 #include <linux/rtnetlink.h>
78
79 #ifdef CONFIG_IPV6_PRIVACY
80 #include <linux/random.h>
81 #include <linux/crypto.h>
82 #include <linux/scatterlist.h>
83 #endif
84
85 #include <asm/uaccess.h>
86
87 #include <linux/proc_fs.h>
88 #include <linux/seq_file.h>
89
90 /* Set to 3 to get tracing... */
91 #define ACONF_DEBUG 2
92
93 #if ACONF_DEBUG >= 3
94 #define ADBG(x) printk x
95 #else
96 #define ADBG(x)
97 #endif
98
99 #define INFINITY_LIFE_TIME      0xFFFFFFFF
100 #define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b)))
101
102 #ifdef CONFIG_SYSCTL
103 static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p);
104 static void addrconf_sysctl_unregister(struct ipv6_devconf *p);
105 #endif
106
107 #ifdef CONFIG_IPV6_PRIVACY
108 static int __ipv6_regen_rndid(struct inet6_dev *idev);
109 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr); 
110 static void ipv6_regen_rndid(unsigned long data);
111
112 static int desync_factor = MAX_DESYNC_FACTOR * HZ;
113 static struct crypto_tfm *md5_tfm;
114 static DEFINE_SPINLOCK(md5_tfm_lock);
115 #endif
116
117 static int ipv6_count_addresses(struct inet6_dev *idev);
118
119 /*
120  *      Configured unicast address hash table
121  */
122 static struct inet6_ifaddr              *inet6_addr_lst[IN6_ADDR_HSIZE];
123 static DEFINE_RWLOCK(addrconf_hash_lock);
124
125 /* Protects inet6 devices */
126 DEFINE_RWLOCK(addrconf_lock);
127
128 static void addrconf_verify(unsigned long);
129
130 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
131 static DEFINE_SPINLOCK(addrconf_verify_lock);
132
133 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
134 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
135
136 static int addrconf_ifdown(struct net_device *dev, int how);
137
138 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
139 static void addrconf_dad_timer(unsigned long data);
140 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
141 static void addrconf_dad_run(struct inet6_dev *idev);
142 static void addrconf_rs_timer(unsigned long data);
143 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
144 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
145
146 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 
147                                 struct prefix_info *pinfo);
148 static int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev);
149
150 static struct notifier_block *inet6addr_chain;
151
152 struct ipv6_devconf ipv6_devconf = {
153         .forwarding             = 0,
154         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
155         .mtu6                   = IPV6_MIN_MTU,
156         .accept_ra              = 1,
157         .accept_redirects       = 1,
158         .autoconf               = 1,
159         .force_mld_version      = 0,
160         .dad_transmits          = 1,
161         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
162         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
163         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
164 #ifdef CONFIG_IPV6_PRIVACY
165         .use_tempaddr           = 0,
166         .temp_valid_lft         = TEMP_VALID_LIFETIME,
167         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
168         .regen_max_retry        = REGEN_MAX_RETRY,
169         .max_desync_factor      = MAX_DESYNC_FACTOR,
170 #endif
171         .max_addresses          = IPV6_MAX_ADDRESSES,
172 };
173
174 static struct ipv6_devconf ipv6_devconf_dflt = {
175         .forwarding             = 0,
176         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
177         .mtu6                   = IPV6_MIN_MTU,
178         .accept_ra              = 1,
179         .accept_redirects       = 1,
180         .autoconf               = 1,
181         .dad_transmits          = 1,
182         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
183         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
184         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
185 #ifdef CONFIG_IPV6_PRIVACY
186         .use_tempaddr           = 0,
187         .temp_valid_lft         = TEMP_VALID_LIFETIME,
188         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
189         .regen_max_retry        = REGEN_MAX_RETRY,
190         .max_desync_factor      = MAX_DESYNC_FACTOR,
191 #endif
192         .max_addresses          = IPV6_MAX_ADDRESSES,
193 };
194
195 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
196 #if 0
197 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
198 #endif
199 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
200
201 #define IPV6_ADDR_SCOPE_TYPE(scope)     ((scope) << 16)
202
203 static inline unsigned ipv6_addr_scope2type(unsigned scope)
204 {
205         switch(scope) {
206         case IPV6_ADDR_SCOPE_NODELOCAL:
207                 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_NODELOCAL) |
208                         IPV6_ADDR_LOOPBACK);
209         case IPV6_ADDR_SCOPE_LINKLOCAL:
210                 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL) |
211                         IPV6_ADDR_LINKLOCAL);
212         case IPV6_ADDR_SCOPE_SITELOCAL:
213                 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_SITELOCAL) |
214                         IPV6_ADDR_SITELOCAL);
215         }
216         return IPV6_ADDR_SCOPE_TYPE(scope);
217 }
218
219 int __ipv6_addr_type(const struct in6_addr *addr)
220 {
221         u32 st;
222
223         st = addr->s6_addr32[0];
224
225         /* Consider all addresses with the first three bits different of
226            000 and 111 as unicasts.
227          */
228         if ((st & htonl(0xE0000000)) != htonl(0x00000000) &&
229             (st & htonl(0xE0000000)) != htonl(0xE0000000))
230                 return (IPV6_ADDR_UNICAST | 
231                         IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));
232
233         if ((st & htonl(0xFF000000)) == htonl(0xFF000000)) {
234                 /* multicast */
235                 /* addr-select 3.1 */
236                 return (IPV6_ADDR_MULTICAST |
237                         ipv6_addr_scope2type(IPV6_ADDR_MC_SCOPE(addr)));
238         }
239
240         if ((st & htonl(0xFFC00000)) == htonl(0xFE800000))
241                 return (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_UNICAST | 
242                         IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL));               /* addr-select 3.1 */
243         if ((st & htonl(0xFFC00000)) == htonl(0xFEC00000))
244                 return (IPV6_ADDR_SITELOCAL | IPV6_ADDR_UNICAST |
245                         IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_SITELOCAL));               /* addr-select 3.1 */
246
247         if ((addr->s6_addr32[0] | addr->s6_addr32[1]) == 0) {
248                 if (addr->s6_addr32[2] == 0) {
249                         if (addr->s6_addr32[3] == 0)
250                                 return IPV6_ADDR_ANY;
251
252                         if (addr->s6_addr32[3] == htonl(0x00000001))
253                                 return (IPV6_ADDR_LOOPBACK | IPV6_ADDR_UNICAST |
254                                         IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL));       /* addr-select 3.4 */
255
256                         return (IPV6_ADDR_COMPATv4 | IPV6_ADDR_UNICAST |
257                                 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));  /* addr-select 3.3 */
258                 }
259
260                 if (addr->s6_addr32[2] == htonl(0x0000ffff))
261                         return (IPV6_ADDR_MAPPED | 
262                                 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));  /* addr-select 3.3 */
263         }
264
265         return (IPV6_ADDR_RESERVED | 
266                 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));  /* addr-select 3.4 */
267 }
268
269 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
270 {
271         if (del_timer(&ifp->timer))
272                 __in6_ifa_put(ifp);
273 }
274
275 enum addrconf_timer_t
276 {
277         AC_NONE,
278         AC_DAD,
279         AC_RS,
280 };
281
282 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
283                                enum addrconf_timer_t what,
284                                unsigned long when)
285 {
286         if (!del_timer(&ifp->timer))
287                 in6_ifa_hold(ifp);
288
289         switch (what) {
290         case AC_DAD:
291                 ifp->timer.function = addrconf_dad_timer;
292                 break;
293         case AC_RS:
294                 ifp->timer.function = addrconf_rs_timer;
295                 break;
296         default:;
297         }
298         ifp->timer.expires = jiffies + when;
299         add_timer(&ifp->timer);
300 }
301
302 /* Nobody refers to this device, we may destroy it. */
303
304 void in6_dev_finish_destroy(struct inet6_dev *idev)
305 {
306         struct net_device *dev = idev->dev;
307         BUG_TRAP(idev->addr_list==NULL);
308         BUG_TRAP(idev->mc_list==NULL);
309 #ifdef NET_REFCNT_DEBUG
310         printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
311 #endif
312         dev_put(dev);
313         if (!idev->dead) {
314                 printk("Freeing alive inet6 device %p\n", idev);
315                 return;
316         }
317         snmp6_free_dev(idev);
318         kfree(idev);
319 }
320
321 static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
322 {
323         struct inet6_dev *ndev;
324
325         ASSERT_RTNL();
326
327         if (dev->mtu < IPV6_MIN_MTU)
328                 return NULL;
329
330         ndev = kmalloc(sizeof(struct inet6_dev), GFP_KERNEL);
331
332         if (ndev) {
333                 memset(ndev, 0, sizeof(struct inet6_dev));
334
335                 rwlock_init(&ndev->lock);
336                 ndev->dev = dev;
337                 memcpy(&ndev->cnf, &ipv6_devconf_dflt, sizeof(ndev->cnf));
338                 ndev->cnf.mtu6 = dev->mtu;
339                 ndev->cnf.sysctl = NULL;
340                 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
341                 if (ndev->nd_parms == NULL) {
342                         kfree(ndev);
343                         return NULL;
344                 }
345                 /* We refer to the device */
346                 dev_hold(dev);
347
348                 if (snmp6_alloc_dev(ndev) < 0) {
349                         ADBG((KERN_WARNING
350                                 "%s(): cannot allocate memory for statistics; dev=%s.\n",
351                                 __FUNCTION__, dev->name));
352                         neigh_parms_release(&nd_tbl, ndev->nd_parms);
353                         ndev->dead = 1;
354                         in6_dev_finish_destroy(ndev);
355                         return NULL;
356                 }
357
358                 if (snmp6_register_dev(ndev) < 0) {
359                         ADBG((KERN_WARNING
360                                 "%s(): cannot create /proc/net/dev_snmp6/%s\n",
361                                 __FUNCTION__, dev->name));
362                         neigh_parms_release(&nd_tbl, ndev->nd_parms);
363                         ndev->dead = 1;
364                         in6_dev_finish_destroy(ndev);
365                         return NULL;
366                 }
367
368                 /* One reference from device.  We must do this before
369                  * we invoke __ipv6_regen_rndid().
370                  */
371                 in6_dev_hold(ndev);
372
373 #ifdef CONFIG_IPV6_PRIVACY
374                 get_random_bytes(ndev->rndid, sizeof(ndev->rndid));
375                 get_random_bytes(ndev->entropy, sizeof(ndev->entropy));
376                 init_timer(&ndev->regen_timer);
377                 ndev->regen_timer.function = ipv6_regen_rndid;
378                 ndev->regen_timer.data = (unsigned long) ndev;
379                 if ((dev->flags&IFF_LOOPBACK) ||
380                     dev->type == ARPHRD_TUNNEL ||
381                     dev->type == ARPHRD_NONE ||
382                     dev->type == ARPHRD_SIT) {
383                         printk(KERN_INFO
384                                "%s: Disabled Privacy Extensions\n",
385                                dev->name);
386                         ndev->cnf.use_tempaddr = -1;
387                 } else {
388                         in6_dev_hold(ndev);
389                         ipv6_regen_rndid((unsigned long) ndev);
390                 }
391 #endif
392
393                 if (netif_carrier_ok(dev))
394                         ndev->if_flags |= IF_READY;
395
396                 write_lock_bh(&addrconf_lock);
397                 dev->ip6_ptr = ndev;
398                 write_unlock_bh(&addrconf_lock);
399
400                 ipv6_mc_init_dev(ndev);
401                 ndev->tstamp = jiffies;
402 #ifdef CONFIG_SYSCTL
403                 neigh_sysctl_register(dev, ndev->nd_parms, NET_IPV6, 
404                                       NET_IPV6_NEIGH, "ipv6",
405                                       &ndisc_ifinfo_sysctl_change,
406                                       NULL);
407                 addrconf_sysctl_register(ndev, &ndev->cnf);
408 #endif
409         }
410         return ndev;
411 }
412
413 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
414 {
415         struct inet6_dev *idev;
416
417         ASSERT_RTNL();
418
419         if ((idev = __in6_dev_get(dev)) == NULL) {
420                 if ((idev = ipv6_add_dev(dev)) == NULL)
421                         return NULL;
422         }
423
424         if (dev->flags&IFF_UP)
425                 ipv6_mc_up(idev);
426         return idev;
427 }
428
429 #ifdef CONFIG_SYSCTL
430 static void dev_forward_change(struct inet6_dev *idev)
431 {
432         struct net_device *dev;
433         struct inet6_ifaddr *ifa;
434         struct in6_addr addr;
435
436         if (!idev)
437                 return;
438         dev = idev->dev;
439         if (dev && (dev->flags & IFF_MULTICAST)) {
440                 ipv6_addr_all_routers(&addr);
441         
442                 if (idev->cnf.forwarding)
443                         ipv6_dev_mc_inc(dev, &addr);
444                 else
445                         ipv6_dev_mc_dec(dev, &addr);
446         }
447         for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
448                 if (idev->cnf.forwarding)
449                         addrconf_join_anycast(ifa);
450                 else
451                         addrconf_leave_anycast(ifa);
452         }
453 }
454
455
456 static void addrconf_forward_change(void)
457 {
458         struct net_device *dev;
459         struct inet6_dev *idev;
460
461         read_lock(&dev_base_lock);
462         for (dev=dev_base; dev; dev=dev->next) {
463                 read_lock(&addrconf_lock);
464                 idev = __in6_dev_get(dev);
465                 if (idev) {
466                         int changed = (!idev->cnf.forwarding) ^ (!ipv6_devconf.forwarding);
467                         idev->cnf.forwarding = ipv6_devconf.forwarding;
468                         if (changed)
469                                 dev_forward_change(idev);
470                 }
471                 read_unlock(&addrconf_lock);
472         }
473         read_unlock(&dev_base_lock);
474 }
475 #endif
476
477 /* Nobody refers to this ifaddr, destroy it */
478
479 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
480 {
481         BUG_TRAP(ifp->if_next==NULL);
482         BUG_TRAP(ifp->lst_next==NULL);
483 #ifdef NET_REFCNT_DEBUG
484         printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
485 #endif
486
487         in6_dev_put(ifp->idev);
488
489         if (del_timer(&ifp->timer))
490                 printk("Timer is still running, when freeing ifa=%p\n", ifp);
491
492         if (!ifp->dead) {
493                 printk("Freeing alive inet6 address %p\n", ifp);
494                 return;
495         }
496         dst_release(&ifp->rt->u.dst);
497
498         kfree(ifp);
499 }
500
501 /* On success it returns ifp with increased reference count */
502
503 static struct inet6_ifaddr *
504 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
505               int scope, u32 flags)
506 {
507         struct inet6_ifaddr *ifa = NULL;
508         struct rt6_info *rt;
509         int hash;
510         int err = 0;
511
512         read_lock_bh(&addrconf_lock);
513         if (idev->dead) {
514                 err = -ENODEV;                  /*XXX*/
515                 goto out2;
516         }
517
518         write_lock(&addrconf_hash_lock);
519
520         /* Ignore adding duplicate addresses on an interface */
521         if (ipv6_chk_same_addr(addr, idev->dev)) {
522                 ADBG(("ipv6_add_addr: already assigned\n"));
523                 err = -EEXIST;
524                 goto out;
525         }
526
527         ifa = kmalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
528
529         if (ifa == NULL) {
530                 ADBG(("ipv6_add_addr: malloc failed\n"));
531                 err = -ENOBUFS;
532                 goto out;
533         }
534
535         rt = addrconf_dst_alloc(idev, addr, 0);
536         if (IS_ERR(rt)) {
537                 err = PTR_ERR(rt);
538                 goto out;
539         }
540
541         memset(ifa, 0, sizeof(struct inet6_ifaddr));
542         ipv6_addr_copy(&ifa->addr, addr);
543
544         spin_lock_init(&ifa->lock);
545         init_timer(&ifa->timer);
546         ifa->timer.data = (unsigned long) ifa;
547         ifa->scope = scope;
548         ifa->prefix_len = pfxlen;
549         ifa->flags = flags | IFA_F_TENTATIVE;
550         ifa->cstamp = ifa->tstamp = jiffies;
551
552         ifa->idev = idev;
553         in6_dev_hold(idev);
554         /* For caller */
555         in6_ifa_hold(ifa);
556
557         /* Add to big hash table */
558         hash = ipv6_addr_hash(addr);
559
560         ifa->lst_next = inet6_addr_lst[hash];
561         inet6_addr_lst[hash] = ifa;
562         in6_ifa_hold(ifa);
563         write_unlock(&addrconf_hash_lock);
564
565         write_lock(&idev->lock);
566         /* Add to inet6_dev unicast addr list. */
567         ifa->if_next = idev->addr_list;
568         idev->addr_list = ifa;
569
570 #ifdef CONFIG_IPV6_PRIVACY
571         if (ifa->flags&IFA_F_TEMPORARY) {
572                 ifa->tmp_next = idev->tempaddr_list;
573                 idev->tempaddr_list = ifa;
574                 in6_ifa_hold(ifa);
575         }
576 #endif
577
578         ifa->rt = rt;
579
580         in6_ifa_hold(ifa);
581         write_unlock(&idev->lock);
582 out2:
583         read_unlock_bh(&addrconf_lock);
584
585         if (likely(err == 0))
586                 notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
587         else {
588                 kfree(ifa);
589                 ifa = ERR_PTR(err);
590         }
591
592         return ifa;
593 out:
594         write_unlock(&addrconf_hash_lock);
595         goto out2;
596 }
597
598 /* This function wants to get referenced ifp and releases it before return */
599
600 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
601 {
602         struct inet6_ifaddr *ifa, **ifap;
603         struct inet6_dev *idev = ifp->idev;
604         int hash;
605         int deleted = 0, onlink = 0;
606         unsigned long expires = jiffies;
607
608         hash = ipv6_addr_hash(&ifp->addr);
609
610         ifp->dead = 1;
611
612         write_lock_bh(&addrconf_hash_lock);
613         for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
614              ifap = &ifa->lst_next) {
615                 if (ifa == ifp) {
616                         *ifap = ifa->lst_next;
617                         __in6_ifa_put(ifp);
618                         ifa->lst_next = NULL;
619                         break;
620                 }
621         }
622         write_unlock_bh(&addrconf_hash_lock);
623
624         write_lock_bh(&idev->lock);
625 #ifdef CONFIG_IPV6_PRIVACY
626         if (ifp->flags&IFA_F_TEMPORARY) {
627                 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
628                      ifap = &ifa->tmp_next) {
629                         if (ifa == ifp) {
630                                 *ifap = ifa->tmp_next;
631                                 if (ifp->ifpub) {
632                                         in6_ifa_put(ifp->ifpub);
633                                         ifp->ifpub = NULL;
634                                 }
635                                 __in6_ifa_put(ifp);
636                                 ifa->tmp_next = NULL;
637                                 break;
638                         }
639                 }
640         }
641 #endif
642
643         for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
644                 if (ifa == ifp) {
645                         *ifap = ifa->if_next;
646                         __in6_ifa_put(ifp);
647                         ifa->if_next = NULL;
648                         if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
649                                 break;
650                         deleted = 1;
651                         continue;
652                 } else if (ifp->flags & IFA_F_PERMANENT) {
653                         if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
654                                               ifp->prefix_len)) {
655                                 if (ifa->flags & IFA_F_PERMANENT) {
656                                         onlink = 1;
657                                         if (deleted)
658                                                 break;
659                                 } else {
660                                         unsigned long lifetime;
661
662                                         if (!onlink)
663                                                 onlink = -1;
664
665                                         spin_lock(&ifa->lock);
666                                         lifetime = min_t(unsigned long,
667                                                          ifa->valid_lft, 0x7fffffffUL/HZ);
668                                         if (time_before(expires,
669                                                         ifa->tstamp + lifetime * HZ))
670                                                 expires = ifa->tstamp + lifetime * HZ;
671                                         spin_unlock(&ifa->lock);
672                                 }
673                         }
674                 }
675                 ifap = &ifa->if_next;
676         }
677         write_unlock_bh(&idev->lock);
678
679         ipv6_ifa_notify(RTM_DELADDR, ifp);
680
681         notifier_call_chain(&inet6addr_chain,NETDEV_DOWN,ifp);
682
683         addrconf_del_timer(ifp);
684
685         /*
686          * Purge or update corresponding prefix
687          *
688          * 1) we don't purge prefix here if address was not permanent.
689          *    prefix is managed by its own lifetime.
690          * 2) if there're no addresses, delete prefix.
691          * 3) if there're still other permanent address(es),
692          *    corresponding prefix is still permanent.
693          * 4) otherwise, update prefix lifetime to the
694          *    longest valid lifetime among the corresponding
695          *    addresses on the device.
696          *    Note: subsequent RA will update lifetime.
697          *
698          * --yoshfuji
699          */
700         if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
701                 struct in6_addr prefix;
702                 struct rt6_info *rt;
703
704                 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
705                 rt = rt6_lookup(&prefix, NULL, ifp->idev->dev->ifindex, 1);
706
707                 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
708                         if (onlink == 0) {
709                                 ip6_del_rt(rt, NULL, NULL, NULL);
710                                 rt = NULL;
711                         } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
712                                 rt->rt6i_expires = expires;
713                                 rt->rt6i_flags |= RTF_EXPIRES;
714                         }
715                 }
716                 dst_release(&rt->u.dst);
717         }
718
719         in6_ifa_put(ifp);
720 }
721
722 #ifdef CONFIG_IPV6_PRIVACY
723 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
724 {
725         struct inet6_dev *idev = ifp->idev;
726         struct in6_addr addr, *tmpaddr;
727         unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
728         int tmp_plen;
729         int ret = 0;
730         int max_addresses;
731
732         write_lock(&idev->lock);
733         if (ift) {
734                 spin_lock_bh(&ift->lock);
735                 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
736                 spin_unlock_bh(&ift->lock);
737                 tmpaddr = &addr;
738         } else {
739                 tmpaddr = NULL;
740         }
741 retry:
742         in6_dev_hold(idev);
743         if (idev->cnf.use_tempaddr <= 0) {
744                 write_unlock(&idev->lock);
745                 printk(KERN_INFO
746                         "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
747                 in6_dev_put(idev);
748                 ret = -1;
749                 goto out;
750         }
751         spin_lock_bh(&ifp->lock);
752         if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
753                 idev->cnf.use_tempaddr = -1;    /*XXX*/
754                 spin_unlock_bh(&ifp->lock);
755                 write_unlock(&idev->lock);
756                 printk(KERN_WARNING
757                         "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
758                 in6_dev_put(idev);
759                 ret = -1;
760                 goto out;
761         }
762         in6_ifa_hold(ifp);
763         memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
764         if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
765                 spin_unlock_bh(&ifp->lock);
766                 write_unlock(&idev->lock);
767                 printk(KERN_WARNING
768                         "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
769                 in6_ifa_put(ifp);
770                 in6_dev_put(idev);
771                 ret = -1;
772                 goto out;
773         }
774         memcpy(&addr.s6_addr[8], idev->rndid, 8);
775         tmp_valid_lft = min_t(__u32,
776                               ifp->valid_lft,
777                               idev->cnf.temp_valid_lft);
778         tmp_prefered_lft = min_t(__u32, 
779                                  ifp->prefered_lft, 
780                                  idev->cnf.temp_prefered_lft - desync_factor / HZ);
781         tmp_plen = ifp->prefix_len;
782         max_addresses = idev->cnf.max_addresses;
783         tmp_cstamp = ifp->cstamp;
784         tmp_tstamp = ifp->tstamp;
785         spin_unlock_bh(&ifp->lock);
786
787         write_unlock(&idev->lock);
788         ift = !max_addresses ||
789               ipv6_count_addresses(idev) < max_addresses ? 
790                 ipv6_add_addr(idev, &addr, tmp_plen,
791                               ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK, IFA_F_TEMPORARY) : NULL;
792         if (!ift || IS_ERR(ift)) {
793                 in6_ifa_put(ifp);
794                 in6_dev_put(idev);
795                 printk(KERN_INFO
796                         "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
797                 tmpaddr = &addr;
798                 write_lock(&idev->lock);
799                 goto retry;
800         }
801
802         spin_lock_bh(&ift->lock);
803         ift->ifpub = ifp;
804         ift->valid_lft = tmp_valid_lft;
805         ift->prefered_lft = tmp_prefered_lft;
806         ift->cstamp = tmp_cstamp;
807         ift->tstamp = tmp_tstamp;
808         spin_unlock_bh(&ift->lock);
809
810         addrconf_dad_start(ift, 0);
811         in6_ifa_put(ift);
812         in6_dev_put(idev);
813 out:
814         return ret;
815 }
816 #endif
817
818 /*
819  *      Choose an appropriate source address (RFC3484)
820  */
821 struct ipv6_saddr_score {
822         int             addr_type;
823         unsigned int    attrs;
824         int             matchlen;
825         unsigned int    scope;
826         unsigned int    rule;
827 };
828
829 #define IPV6_SADDR_SCORE_LOCAL          0x0001
830 #define IPV6_SADDR_SCORE_PREFERRED      0x0004
831 #define IPV6_SADDR_SCORE_HOA            0x0008
832 #define IPV6_SADDR_SCORE_OIF            0x0010
833 #define IPV6_SADDR_SCORE_LABEL          0x0020
834 #define IPV6_SADDR_SCORE_PRIVACY        0x0040
835
836 static int inline ipv6_saddr_preferred(int type)
837 {
838         if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
839                     IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
840                 return 1;
841         return 0;
842 }
843
844 /* static matching label */
845 static int inline ipv6_saddr_label(const struct in6_addr *addr, int type)
846 {
847  /*
848   *     prefix (longest match)  label
849   *     -----------------------------
850   *     ::1/128                 0
851   *     ::/0                    1
852   *     2002::/16               2
853   *     ::/96                   3
854   *     ::ffff:0:0/96           4
855   */
856         if (type & IPV6_ADDR_LOOPBACK)
857                 return 0;
858         else if (type & IPV6_ADDR_COMPATv4)
859                 return 3;
860         else if (type & IPV6_ADDR_MAPPED)
861                 return 4;
862         else if (addr->s6_addr16[0] == htons(0x2002))
863                 return 2;
864         return 1;
865 }
866
867 int ipv6_dev_get_saddr(struct net_device *daddr_dev,
868                        struct in6_addr *daddr, struct in6_addr *saddr)
869 {
870         struct ipv6_saddr_score hiscore;
871         struct inet6_ifaddr *ifa_result = NULL;
872         int daddr_type = __ipv6_addr_type(daddr);
873         int daddr_scope = __ipv6_addr_src_scope(daddr_type);
874         u32 daddr_label = ipv6_saddr_label(daddr, daddr_type);
875         struct net_device *dev;
876
877         memset(&hiscore, 0, sizeof(hiscore));
878
879         read_lock(&dev_base_lock);
880         read_lock(&addrconf_lock);
881
882         for (dev = dev_base; dev; dev=dev->next) {
883                 struct inet6_dev *idev;
884                 struct inet6_ifaddr *ifa;
885
886                 /* Rule 0: Candidate Source Address (section 4)
887                  *  - multicast and link-local destination address,
888                  *    the set of candidate source address MUST only
889                  *    include addresses assigned to interfaces
890                  *    belonging to the same link as the outgoing
891                  *    interface.
892                  * (- For site-local destination addresses, the
893                  *    set of candidate source addresses MUST only
894                  *    include addresses assigned to interfaces
895                  *    belonging to the same site as the outgoing
896                  *    interface.)
897                  */
898                 if ((daddr_type & IPV6_ADDR_MULTICAST ||
899                      daddr_scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
900                     daddr_dev && dev != daddr_dev)
901                         continue;
902
903                 idev = __in6_dev_get(dev);
904                 if (!idev)
905                         continue;
906
907                 read_lock_bh(&idev->lock);
908                 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
909                         struct ipv6_saddr_score score;
910
911                         score.addr_type = __ipv6_addr_type(&ifa->addr);
912
913                         /* Rule 0:
914                          * - Tentative Address (RFC2462 section 5.4)
915                          *  - A tentative address is not considered
916                          *    "assigned to an interface" in the traditional
917                          *    sense.
918                          * - Candidate Source Address (section 4)
919                          *  - In any case, anycast addresses, multicast
920                          *    addresses, and the unspecified address MUST
921                          *    NOT be included in a candidate set.
922                          */
923                         if (ifa->flags & IFA_F_TENTATIVE)
924                                 continue;
925                         if (unlikely(score.addr_type == IPV6_ADDR_ANY ||
926                                      score.addr_type & IPV6_ADDR_MULTICAST)) {
927                                 LIMIT_NETDEBUG(KERN_DEBUG
928                                                "ADDRCONF: unspecified / multicast address"
929                                                "assigned as unicast address on %s",
930                                                dev->name);
931                                 continue;
932                         }
933
934                         score.attrs = 0;
935                         score.matchlen = 0;
936                         score.scope = 0;
937                         score.rule = 0;
938
939                         if (ifa_result == NULL) {
940                                 /* record it if the first available entry */
941                                 goto record_it;
942                         }
943
944                         /* Rule 1: Prefer same address */
945                         if (hiscore.rule < 1) {
946                                 if (ipv6_addr_equal(&ifa_result->addr, daddr))
947                                         hiscore.attrs |= IPV6_SADDR_SCORE_LOCAL;
948                                 hiscore.rule++;
949                         }
950                         if (ipv6_addr_equal(&ifa->addr, daddr)) {
951                                 score.attrs |= IPV6_SADDR_SCORE_LOCAL;
952                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)) {
953                                         score.rule = 1;
954                                         goto record_it;
955                                 }
956                         } else {
957                                 if (hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)
958                                         continue;
959                         }
960
961                         /* Rule 2: Prefer appropriate scope */
962                         if (hiscore.rule < 2) {
963                                 hiscore.scope = __ipv6_addr_src_scope(hiscore.addr_type);
964                                 hiscore.rule++;
965                         }
966                         score.scope = __ipv6_addr_src_scope(score.addr_type);
967                         if (hiscore.scope < score.scope) {
968                                 if (hiscore.scope < daddr_scope) {
969                                         score.rule = 2;
970                                         goto record_it;
971                                 } else
972                                         continue;
973                         } else if (score.scope < hiscore.scope) {
974                                 if (score.scope < daddr_scope)
975                                         continue;
976                                 else {
977                                         score.rule = 2;
978                                         goto record_it;
979                                 }
980                         }
981
982                         /* Rule 3: Avoid deprecated address */
983                         if (hiscore.rule < 3) {
984                                 if (ipv6_saddr_preferred(hiscore.addr_type) ||
985                                     !(ifa_result->flags & IFA_F_DEPRECATED))
986                                         hiscore.attrs |= IPV6_SADDR_SCORE_PREFERRED;
987                                 hiscore.rule++;
988                         }
989                         if (ipv6_saddr_preferred(score.addr_type) ||
990                             !(ifa->flags & IFA_F_DEPRECATED)) {
991                                 score.attrs |= IPV6_SADDR_SCORE_PREFERRED;
992                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)) {
993                                         score.rule = 3;
994                                         goto record_it;
995                                 }
996                         } else {
997                                 if (hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)
998                                         continue;
999                         }
1000
1001                         /* Rule 4: Prefer home address -- not implemented yet */
1002                         if (hiscore.rule < 4)
1003                                 hiscore.rule++;
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 #endif
1063                         /* Rule 8: Use longest matching prefix */
1064                         if (hiscore.rule < 8) {
1065                                 hiscore.matchlen = ipv6_addr_diff(&ifa_result->addr, daddr);
1066                                 hiscore.rule++;
1067                         }
1068                         score.matchlen = ipv6_addr_diff(&ifa->addr, daddr);
1069                         if (score.matchlen > hiscore.matchlen) {
1070                                 score.rule = 8;
1071                                 goto record_it;
1072                         }
1073 #if 0
1074                         else if (score.matchlen < hiscore.matchlen)
1075                                 continue;
1076 #endif
1077
1078                         /* Final Rule: choose first available one */
1079                         continue;
1080 record_it:
1081                         if (ifa_result)
1082                                 in6_ifa_put(ifa_result);
1083                         in6_ifa_hold(ifa);
1084                         ifa_result = ifa;
1085                         hiscore = score;
1086                 }
1087                 read_unlock_bh(&idev->lock);
1088         }
1089         read_unlock(&addrconf_lock);
1090         read_unlock(&dev_base_lock);
1091
1092         if (!ifa_result)
1093                 return -EADDRNOTAVAIL;
1094         
1095         ipv6_addr_copy(saddr, &ifa_result->addr);
1096         in6_ifa_put(ifa_result);
1097         return 0;
1098 }
1099
1100
1101 int ipv6_get_saddr(struct dst_entry *dst,
1102                    struct in6_addr *daddr, struct in6_addr *saddr)
1103 {
1104         return ipv6_dev_get_saddr(dst ? ((struct rt6_info *)dst)->rt6i_idev->dev : NULL, daddr, saddr);
1105 }
1106
1107
1108 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr)
1109 {
1110         struct inet6_dev *idev;
1111         int err = -EADDRNOTAVAIL;
1112
1113         read_lock(&addrconf_lock);
1114         if ((idev = __in6_dev_get(dev)) != NULL) {
1115                 struct inet6_ifaddr *ifp;
1116
1117                 read_lock_bh(&idev->lock);
1118                 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1119                         if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1120                                 ipv6_addr_copy(addr, &ifp->addr);
1121                                 err = 0;
1122                                 break;
1123                         }
1124                 }
1125                 read_unlock_bh(&idev->lock);
1126         }
1127         read_unlock(&addrconf_lock);
1128         return err;
1129 }
1130
1131 static int ipv6_count_addresses(struct inet6_dev *idev)
1132 {
1133         int cnt = 0;
1134         struct inet6_ifaddr *ifp;
1135
1136         read_lock_bh(&idev->lock);
1137         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1138                 cnt++;
1139         read_unlock_bh(&idev->lock);
1140         return cnt;
1141 }
1142
1143 int ipv6_chk_addr(struct in6_addr *addr, struct net_device *dev, int strict)
1144 {
1145         struct inet6_ifaddr * ifp;
1146         u8 hash = ipv6_addr_hash(addr);
1147
1148         read_lock_bh(&addrconf_hash_lock);
1149         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1150                 if (ipv6_addr_equal(&ifp->addr, addr) &&
1151                     !(ifp->flags&IFA_F_TENTATIVE)) {
1152                         if (dev == NULL || ifp->idev->dev == dev ||
1153                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1154                                 break;
1155                 }
1156         }
1157         read_unlock_bh(&addrconf_hash_lock);
1158         return ifp != NULL;
1159 }
1160
1161 static
1162 int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev)
1163 {
1164         struct inet6_ifaddr * ifp;
1165         u8 hash = ipv6_addr_hash(addr);
1166
1167         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1168                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1169                         if (dev == NULL || ifp->idev->dev == dev)
1170                                 break;
1171                 }
1172         }
1173         return ifp != NULL;
1174 }
1175
1176 struct inet6_ifaddr * ipv6_get_ifaddr(struct in6_addr *addr, struct net_device *dev, int strict)
1177 {
1178         struct inet6_ifaddr * ifp;
1179         u8 hash = ipv6_addr_hash(addr);
1180
1181         read_lock_bh(&addrconf_hash_lock);
1182         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1183                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1184                         if (dev == NULL || ifp->idev->dev == dev ||
1185                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1186                                 in6_ifa_hold(ifp);
1187                                 break;
1188                         }
1189                 }
1190         }
1191         read_unlock_bh(&addrconf_hash_lock);
1192
1193         return ifp;
1194 }
1195
1196 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1197 {
1198         const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
1199         const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
1200         u32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
1201         u32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1202         int sk_ipv6only = ipv6_only_sock(sk);
1203         int sk2_ipv6only = inet_v6_ipv6only(sk2);
1204         int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1205         int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1206
1207         if (!sk2_rcv_saddr && !sk_ipv6only)
1208                 return 1;
1209
1210         if (addr_type2 == IPV6_ADDR_ANY &&
1211             !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1212                 return 1;
1213
1214         if (addr_type == IPV6_ADDR_ANY &&
1215             !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1216                 return 1;
1217
1218         if (sk2_rcv_saddr6 &&
1219             ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1220                 return 1;
1221
1222         if (addr_type == IPV6_ADDR_MAPPED &&
1223             !sk2_ipv6only &&
1224             (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1225                 return 1;
1226
1227         return 0;
1228 }
1229
1230 /* Gets referenced address, destroys ifaddr */
1231
1232 static void addrconf_dad_stop(struct inet6_ifaddr *ifp)
1233 {
1234         if (ifp->flags&IFA_F_PERMANENT) {
1235                 spin_lock_bh(&ifp->lock);
1236                 addrconf_del_timer(ifp);
1237                 ifp->flags |= IFA_F_TENTATIVE;
1238                 spin_unlock_bh(&ifp->lock);
1239                 in6_ifa_put(ifp);
1240 #ifdef CONFIG_IPV6_PRIVACY
1241         } else if (ifp->flags&IFA_F_TEMPORARY) {
1242                 struct inet6_ifaddr *ifpub;
1243                 spin_lock_bh(&ifp->lock);
1244                 ifpub = ifp->ifpub;
1245                 if (ifpub) {
1246                         in6_ifa_hold(ifpub);
1247                         spin_unlock_bh(&ifp->lock);
1248                         ipv6_create_tempaddr(ifpub, ifp);
1249                         in6_ifa_put(ifpub);
1250                 } else {
1251                         spin_unlock_bh(&ifp->lock);
1252                 }
1253                 ipv6_del_addr(ifp);
1254 #endif
1255         } else
1256                 ipv6_del_addr(ifp);
1257 }
1258
1259 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1260 {
1261         if (net_ratelimit())
1262                 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1263         addrconf_dad_stop(ifp);
1264 }
1265
1266 /* Join to solicited addr multicast group. */
1267
1268 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1269 {
1270         struct in6_addr maddr;
1271
1272         if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1273                 return;
1274
1275         addrconf_addr_solict_mult(addr, &maddr);
1276         ipv6_dev_mc_inc(dev, &maddr);
1277 }
1278
1279 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1280 {
1281         struct in6_addr maddr;
1282
1283         if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1284                 return;
1285
1286         addrconf_addr_solict_mult(addr, &maddr);
1287         __ipv6_dev_mc_dec(idev, &maddr);
1288 }
1289
1290 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1291 {
1292         struct in6_addr addr;
1293         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1294         if (ipv6_addr_any(&addr))
1295                 return;
1296         ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1297 }
1298
1299 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1300 {
1301         struct in6_addr addr;
1302         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1303         if (ipv6_addr_any(&addr))
1304                 return;
1305         __ipv6_dev_ac_dec(ifp->idev, &addr);
1306 }
1307
1308 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1309 {
1310         switch (dev->type) {
1311         case ARPHRD_ETHER:
1312         case ARPHRD_FDDI:
1313         case ARPHRD_IEEE802_TR:
1314                 if (dev->addr_len != ETH_ALEN)
1315                         return -1;
1316                 memcpy(eui, dev->dev_addr, 3);
1317                 memcpy(eui + 5, dev->dev_addr + 3, 3);
1318
1319                 /*
1320                  * The zSeries OSA network cards can be shared among various
1321                  * OS instances, but the OSA cards have only one MAC address.
1322                  * This leads to duplicate address conflicts in conjunction
1323                  * with IPv6 if more than one instance uses the same card.
1324                  * 
1325                  * The driver for these cards can deliver a unique 16-bit
1326                  * identifier for each instance sharing the same card.  It is
1327                  * placed instead of 0xFFFE in the interface identifier.  The
1328                  * "u" bit of the interface identifier is not inverted in this
1329                  * case.  Hence the resulting interface identifier has local
1330                  * scope according to RFC2373.
1331                  */
1332                 if (dev->dev_id) {
1333                         eui[3] = (dev->dev_id >> 8) & 0xFF;
1334                         eui[4] = dev->dev_id & 0xFF;
1335                 } else {
1336                         eui[3] = 0xFF;
1337                         eui[4] = 0xFE;
1338                         eui[0] ^= 2;
1339                 }
1340                 return 0;
1341         case ARPHRD_ARCNET:
1342                 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1343                 if (dev->addr_len != ARCNET_ALEN)
1344                         return -1;
1345                 memset(eui, 0, 7);
1346                 eui[7] = *(u8*)dev->dev_addr;
1347                 return 0;
1348         case ARPHRD_INFINIBAND:
1349                 if (dev->addr_len != INFINIBAND_ALEN)
1350                         return -1;
1351                 memcpy(eui, dev->dev_addr + 12, 8);
1352                 eui[0] |= 2;
1353                 return 0;
1354         }
1355         return -1;
1356 }
1357
1358 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1359 {
1360         int err = -1;
1361         struct inet6_ifaddr *ifp;
1362
1363         read_lock_bh(&idev->lock);
1364         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1365                 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1366                         memcpy(eui, ifp->addr.s6_addr+8, 8);
1367                         err = 0;
1368                         break;
1369                 }
1370         }
1371         read_unlock_bh(&idev->lock);
1372         return err;
1373 }
1374
1375 #ifdef CONFIG_IPV6_PRIVACY
1376 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1377 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1378 {
1379         struct net_device *dev;
1380         struct scatterlist sg[2];
1381
1382         sg_set_buf(&sg[0], idev->entropy, 8);
1383         sg_set_buf(&sg[1], idev->work_eui64, 8);
1384
1385         dev = idev->dev;
1386
1387         if (ipv6_generate_eui64(idev->work_eui64, dev)) {
1388                 printk(KERN_INFO
1389                         "__ipv6_regen_rndid(idev=%p): cannot get EUI64 identifier; use random bytes.\n",
1390                         idev);
1391                 get_random_bytes(idev->work_eui64, sizeof(idev->work_eui64));
1392         }
1393 regen:
1394         spin_lock(&md5_tfm_lock);
1395         if (unlikely(md5_tfm == NULL)) {
1396                 spin_unlock(&md5_tfm_lock);
1397                 return -1;
1398         }
1399         crypto_digest_init(md5_tfm);
1400         crypto_digest_update(md5_tfm, sg, 2);
1401         crypto_digest_final(md5_tfm, idev->work_digest);
1402         spin_unlock(&md5_tfm_lock);
1403
1404         memcpy(idev->rndid, &idev->work_digest[0], 8);
1405         idev->rndid[0] &= ~0x02;
1406         memcpy(idev->entropy, &idev->work_digest[8], 8);
1407
1408         /*
1409          * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1410          * check if generated address is not inappropriate
1411          *
1412          *  - Reserved subnet anycast (RFC 2526)
1413          *      11111101 11....11 1xxxxxxx
1414          *  - ISATAP (draft-ietf-ngtrans-isatap-13.txt) 5.1
1415          *      00-00-5E-FE-xx-xx-xx-xx
1416          *  - value 0
1417          *  - XXX: already assigned to an address on the device
1418          */
1419         if (idev->rndid[0] == 0xfd && 
1420             (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1421             (idev->rndid[7]&0x80))
1422                 goto regen;
1423         if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1424                 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1425                         goto regen;
1426                 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1427                         goto regen;
1428         }
1429
1430         return 0;
1431 }
1432
1433 static void ipv6_regen_rndid(unsigned long data)
1434 {
1435         struct inet6_dev *idev = (struct inet6_dev *) data;
1436         unsigned long expires;
1437
1438         read_lock_bh(&addrconf_lock);
1439         write_lock_bh(&idev->lock);
1440
1441         if (idev->dead)
1442                 goto out;
1443
1444         if (__ipv6_regen_rndid(idev) < 0)
1445                 goto out;
1446         
1447         expires = jiffies +
1448                 idev->cnf.temp_prefered_lft * HZ - 
1449                 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1450         if (time_before(expires, jiffies)) {
1451                 printk(KERN_WARNING
1452                         "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1453                         idev->dev->name);
1454                 goto out;
1455         }
1456
1457         if (!mod_timer(&idev->regen_timer, expires))
1458                 in6_dev_hold(idev);
1459
1460 out:
1461         write_unlock_bh(&idev->lock);
1462         read_unlock_bh(&addrconf_lock);
1463         in6_dev_put(idev);
1464 }
1465
1466 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1467         int ret = 0;
1468
1469         if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1470                 ret = __ipv6_regen_rndid(idev);
1471         return ret;
1472 }
1473 #endif
1474
1475 /*
1476  *      Add prefix route.
1477  */
1478
1479 static void
1480 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1481                       unsigned long expires, u32 flags)
1482 {
1483         struct in6_rtmsg rtmsg;
1484
1485         memset(&rtmsg, 0, sizeof(rtmsg));
1486         ipv6_addr_copy(&rtmsg.rtmsg_dst, pfx);
1487         rtmsg.rtmsg_dst_len = plen;
1488         rtmsg.rtmsg_metric = IP6_RT_PRIO_ADDRCONF;
1489         rtmsg.rtmsg_ifindex = dev->ifindex;
1490         rtmsg.rtmsg_info = expires;
1491         rtmsg.rtmsg_flags = RTF_UP|flags;
1492         rtmsg.rtmsg_type = RTMSG_NEWROUTE;
1493
1494         /* Prevent useless cloning on PtP SIT.
1495            This thing is done here expecting that the whole
1496            class of non-broadcast devices need not cloning.
1497          */
1498         if (dev->type == ARPHRD_SIT && (dev->flags&IFF_POINTOPOINT))
1499                 rtmsg.rtmsg_flags |= RTF_NONEXTHOP;
1500
1501         ip6_route_add(&rtmsg, NULL, NULL, NULL);
1502 }
1503
1504 /* Create "default" multicast route to the interface */
1505
1506 static void addrconf_add_mroute(struct net_device *dev)
1507 {
1508         struct in6_rtmsg rtmsg;
1509
1510         memset(&rtmsg, 0, sizeof(rtmsg));
1511         ipv6_addr_set(&rtmsg.rtmsg_dst,
1512                       htonl(0xFF000000), 0, 0, 0);
1513         rtmsg.rtmsg_dst_len = 8;
1514         rtmsg.rtmsg_metric = IP6_RT_PRIO_ADDRCONF;
1515         rtmsg.rtmsg_ifindex = dev->ifindex;
1516         rtmsg.rtmsg_flags = RTF_UP;
1517         rtmsg.rtmsg_type = RTMSG_NEWROUTE;
1518         ip6_route_add(&rtmsg, NULL, NULL, NULL);
1519 }
1520
1521 static void sit_route_add(struct net_device *dev)
1522 {
1523         struct in6_rtmsg rtmsg;
1524
1525         memset(&rtmsg, 0, sizeof(rtmsg));
1526
1527         rtmsg.rtmsg_type        = RTMSG_NEWROUTE;
1528         rtmsg.rtmsg_metric      = IP6_RT_PRIO_ADDRCONF;
1529
1530         /* prefix length - 96 bits "::d.d.d.d" */
1531         rtmsg.rtmsg_dst_len     = 96;
1532         rtmsg.rtmsg_flags       = RTF_UP|RTF_NONEXTHOP;
1533         rtmsg.rtmsg_ifindex     = dev->ifindex;
1534
1535         ip6_route_add(&rtmsg, NULL, NULL, NULL);
1536 }
1537
1538 static void addrconf_add_lroute(struct net_device *dev)
1539 {
1540         struct in6_addr addr;
1541
1542         ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
1543         addrconf_prefix_route(&addr, 64, dev, 0, 0);
1544 }
1545
1546 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1547 {
1548         struct inet6_dev *idev;
1549
1550         ASSERT_RTNL();
1551
1552         if ((idev = ipv6_find_idev(dev)) == NULL)
1553                 return NULL;
1554
1555         /* Add default multicast route */
1556         addrconf_add_mroute(dev);
1557
1558         /* Add link local route */
1559         addrconf_add_lroute(dev);
1560         return idev;
1561 }
1562
1563 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1564 {
1565         struct prefix_info *pinfo;
1566         __u32 valid_lft;
1567         __u32 prefered_lft;
1568         int addr_type;
1569         unsigned long rt_expires;
1570         struct inet6_dev *in6_dev;
1571
1572         pinfo = (struct prefix_info *) opt;
1573         
1574         if (len < sizeof(struct prefix_info)) {
1575                 ADBG(("addrconf: prefix option too short\n"));
1576                 return;
1577         }
1578         
1579         /*
1580          *      Validation checks ([ADDRCONF], page 19)
1581          */
1582
1583         addr_type = ipv6_addr_type(&pinfo->prefix);
1584
1585         if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1586                 return;
1587
1588         valid_lft = ntohl(pinfo->valid);
1589         prefered_lft = ntohl(pinfo->prefered);
1590
1591         if (prefered_lft > valid_lft) {
1592                 if (net_ratelimit())
1593                         printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1594                 return;
1595         }
1596
1597         in6_dev = in6_dev_get(dev);
1598
1599         if (in6_dev == NULL) {
1600                 if (net_ratelimit())
1601                         printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1602                 return;
1603         }
1604
1605         /*
1606          *      Two things going on here:
1607          *      1) Add routes for on-link prefixes
1608          *      2) Configure prefixes with the auto flag set
1609          */
1610
1611         /* Avoid arithmetic overflow. Really, we could
1612            save rt_expires in seconds, likely valid_lft,
1613            but it would require division in fib gc, that it
1614            not good.
1615          */
1616         if (valid_lft >= 0x7FFFFFFF/HZ)
1617                 rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ);
1618         else
1619                 rt_expires = valid_lft * HZ;
1620
1621         /*
1622          * We convert this (in jiffies) to clock_t later.
1623          * Avoid arithmetic overflow there as well.
1624          * Overflow can happen only if HZ < USER_HZ.
1625          */
1626         if (HZ < USER_HZ && rt_expires > 0x7FFFFFFF / USER_HZ)
1627                 rt_expires = 0x7FFFFFFF / USER_HZ;
1628
1629         if (pinfo->onlink) {
1630                 struct rt6_info *rt;
1631                 rt = rt6_lookup(&pinfo->prefix, NULL, dev->ifindex, 1);
1632
1633                 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
1634                         if (rt->rt6i_flags&RTF_EXPIRES) {
1635                                 if (valid_lft == 0) {
1636                                         ip6_del_rt(rt, NULL, NULL, NULL);
1637                                         rt = NULL;
1638                                 } else {
1639                                         rt->rt6i_expires = jiffies + rt_expires;
1640                                 }
1641                         }
1642                 } else if (valid_lft) {
1643                         addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1644                                               dev, jiffies_to_clock_t(rt_expires), RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT);
1645                 }
1646                 if (rt)
1647                         dst_release(&rt->u.dst);
1648         }
1649
1650         /* Try to figure out our local address for this prefix */
1651
1652         if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1653                 struct inet6_ifaddr * ifp;
1654                 struct in6_addr addr;
1655                 int create = 0, update_lft = 0;
1656
1657                 if (pinfo->prefix_len == 64) {
1658                         memcpy(&addr, &pinfo->prefix, 8);
1659                         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1660                             ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1661                                 in6_dev_put(in6_dev);
1662                                 return;
1663                         }
1664                         goto ok;
1665                 }
1666                 if (net_ratelimit())
1667                         printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1668                                pinfo->prefix_len);
1669                 in6_dev_put(in6_dev);
1670                 return;
1671
1672 ok:
1673
1674                 ifp = ipv6_get_ifaddr(&addr, dev, 1);
1675
1676                 if (ifp == NULL && valid_lft) {
1677                         int max_addresses = in6_dev->cnf.max_addresses;
1678
1679                         /* Do not allow to create too much of autoconfigured
1680                          * addresses; this would be too easy way to crash kernel.
1681                          */
1682                         if (!max_addresses ||
1683                             ipv6_count_addresses(in6_dev) < max_addresses)
1684                                 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1685                                                     addr_type&IPV6_ADDR_SCOPE_MASK, 0);
1686
1687                         if (!ifp || IS_ERR(ifp)) {
1688                                 in6_dev_put(in6_dev);
1689                                 return;
1690                         }
1691
1692                         update_lft = create = 1;
1693                         ifp->cstamp = jiffies;
1694                         addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1695                 }
1696
1697                 if (ifp) {
1698                         int flags;
1699                         unsigned long now;
1700 #ifdef CONFIG_IPV6_PRIVACY
1701                         struct inet6_ifaddr *ift;
1702 #endif
1703                         u32 stored_lft;
1704
1705                         /* update lifetime (RFC2462 5.5.3 e) */
1706                         spin_lock(&ifp->lock);
1707                         now = jiffies;
1708                         if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1709                                 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1710                         else
1711                                 stored_lft = 0;
1712                         if (!update_lft && stored_lft) {
1713                                 if (valid_lft > MIN_VALID_LIFETIME ||
1714                                     valid_lft > stored_lft)
1715                                         update_lft = 1;
1716                                 else if (stored_lft <= MIN_VALID_LIFETIME) {
1717                                         /* valid_lft <= stored_lft is always true */
1718                                         /* XXX: IPsec */
1719                                         update_lft = 0;
1720                                 } else {
1721                                         valid_lft = MIN_VALID_LIFETIME;
1722                                         if (valid_lft < prefered_lft)
1723                                                 prefered_lft = valid_lft;
1724                                         update_lft = 1;
1725                                 }
1726                         }
1727
1728                         if (update_lft) {
1729                                 ifp->valid_lft = valid_lft;
1730                                 ifp->prefered_lft = prefered_lft;
1731                                 ifp->tstamp = now;
1732                                 flags = ifp->flags;
1733                                 ifp->flags &= ~IFA_F_DEPRECATED;
1734                                 spin_unlock(&ifp->lock);
1735
1736                                 if (!(flags&IFA_F_TENTATIVE))
1737                                         ipv6_ifa_notify(0, ifp);
1738                         } else
1739                                 spin_unlock(&ifp->lock);
1740
1741 #ifdef CONFIG_IPV6_PRIVACY
1742                         read_lock_bh(&in6_dev->lock);
1743                         /* update all temporary addresses in the list */
1744                         for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1745                                 /*
1746                                  * When adjusting the lifetimes of an existing
1747                                  * temporary address, only lower the lifetimes.
1748                                  * Implementations must not increase the
1749                                  * lifetimes of an existing temporary address
1750                                  * when processing a Prefix Information Option.
1751                                  */
1752                                 spin_lock(&ift->lock);
1753                                 flags = ift->flags;
1754                                 if (ift->valid_lft > valid_lft &&
1755                                     ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1756                                         ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1757                                 if (ift->prefered_lft > prefered_lft &&
1758                                     ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1759                                         ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1760                                 spin_unlock(&ift->lock);
1761                                 if (!(flags&IFA_F_TENTATIVE))
1762                                         ipv6_ifa_notify(0, ift);
1763                         }
1764
1765                         if (create && in6_dev->cnf.use_tempaddr > 0) {
1766                                 /*
1767                                  * When a new public address is created as described in [ADDRCONF],
1768                                  * also create a new temporary address.
1769                                  */
1770                                 read_unlock_bh(&in6_dev->lock); 
1771                                 ipv6_create_tempaddr(ifp, NULL);
1772                         } else {
1773                                 read_unlock_bh(&in6_dev->lock);
1774                         }
1775 #endif
1776                         in6_ifa_put(ifp);
1777                         addrconf_verify(0);
1778                 }
1779         }
1780         inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
1781         in6_dev_put(in6_dev);
1782 }
1783
1784 /*
1785  *      Set destination address.
1786  *      Special case for SIT interfaces where we create a new "virtual"
1787  *      device.
1788  */
1789 int addrconf_set_dstaddr(void __user *arg)
1790 {
1791         struct in6_ifreq ireq;
1792         struct net_device *dev;
1793         int err = -EINVAL;
1794
1795         rtnl_lock();
1796
1797         err = -EFAULT;
1798         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1799                 goto err_exit;
1800
1801         dev = __dev_get_by_index(ireq.ifr6_ifindex);
1802
1803         err = -ENODEV;
1804         if (dev == NULL)
1805                 goto err_exit;
1806
1807         if (dev->type == ARPHRD_SIT) {
1808                 struct ifreq ifr;
1809                 mm_segment_t    oldfs;
1810                 struct ip_tunnel_parm p;
1811
1812                 err = -EADDRNOTAVAIL;
1813                 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
1814                         goto err_exit;
1815
1816                 memset(&p, 0, sizeof(p));
1817                 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
1818                 p.iph.saddr = 0;
1819                 p.iph.version = 4;
1820                 p.iph.ihl = 5;
1821                 p.iph.protocol = IPPROTO_IPV6;
1822                 p.iph.ttl = 64;
1823                 ifr.ifr_ifru.ifru_data = (void __user *)&p;
1824
1825                 oldfs = get_fs(); set_fs(KERNEL_DS);
1826                 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
1827                 set_fs(oldfs);
1828
1829                 if (err == 0) {
1830                         err = -ENOBUFS;
1831                         if ((dev = __dev_get_by_name(p.name)) == NULL)
1832                                 goto err_exit;
1833                         err = dev_open(dev);
1834                 }
1835         }
1836
1837 err_exit:
1838         rtnl_unlock();
1839         return err;
1840 }
1841
1842 /*
1843  *      Manual configuration of address on an interface
1844  */
1845 static int inet6_addr_add(int ifindex, struct in6_addr *pfx, int plen)
1846 {
1847         struct inet6_ifaddr *ifp;
1848         struct inet6_dev *idev;
1849         struct net_device *dev;
1850         int scope;
1851
1852         ASSERT_RTNL();
1853         
1854         if ((dev = __dev_get_by_index(ifindex)) == NULL)
1855                 return -ENODEV;
1856         
1857         if (!(dev->flags&IFF_UP))
1858                 return -ENETDOWN;
1859
1860         if ((idev = addrconf_add_dev(dev)) == NULL)
1861                 return -ENOBUFS;
1862
1863         scope = ipv6_addr_scope(pfx);
1864
1865         ifp = ipv6_add_addr(idev, pfx, plen, scope, IFA_F_PERMANENT);
1866         if (!IS_ERR(ifp)) {
1867                 addrconf_dad_start(ifp, 0);
1868                 in6_ifa_put(ifp);
1869                 return 0;
1870         }
1871
1872         return PTR_ERR(ifp);
1873 }
1874
1875 static int inet6_addr_del(int ifindex, struct in6_addr *pfx, int plen)
1876 {
1877         struct inet6_ifaddr *ifp;
1878         struct inet6_dev *idev;
1879         struct net_device *dev;
1880         
1881         if ((dev = __dev_get_by_index(ifindex)) == NULL)
1882                 return -ENODEV;
1883
1884         if ((idev = __in6_dev_get(dev)) == NULL)
1885                 return -ENXIO;
1886
1887         read_lock_bh(&idev->lock);
1888         for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
1889                 if (ifp->prefix_len == plen &&
1890                     ipv6_addr_equal(pfx, &ifp->addr)) {
1891                         in6_ifa_hold(ifp);
1892                         read_unlock_bh(&idev->lock);
1893                         
1894                         ipv6_del_addr(ifp);
1895
1896                         /* If the last address is deleted administratively,
1897                            disable IPv6 on this interface.
1898                          */
1899                         if (idev->addr_list == NULL)
1900                                 addrconf_ifdown(idev->dev, 1);
1901                         return 0;
1902                 }
1903         }
1904         read_unlock_bh(&idev->lock);
1905         return -EADDRNOTAVAIL;
1906 }
1907
1908
1909 int addrconf_add_ifaddr(void __user *arg)
1910 {
1911         struct in6_ifreq ireq;
1912         int err;
1913         
1914         if (!capable(CAP_NET_ADMIN))
1915                 return -EPERM;
1916         
1917         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1918                 return -EFAULT;
1919
1920         rtnl_lock();
1921         err = inet6_addr_add(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
1922         rtnl_unlock();
1923         return err;
1924 }
1925
1926 int addrconf_del_ifaddr(void __user *arg)
1927 {
1928         struct in6_ifreq ireq;
1929         int err;
1930         
1931         if (!capable(CAP_NET_ADMIN))
1932                 return -EPERM;
1933
1934         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1935                 return -EFAULT;
1936
1937         rtnl_lock();
1938         err = inet6_addr_del(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
1939         rtnl_unlock();
1940         return err;
1941 }
1942
1943 static void sit_add_v4_addrs(struct inet6_dev *idev)
1944 {
1945         struct inet6_ifaddr * ifp;
1946         struct in6_addr addr;
1947         struct net_device *dev;
1948         int scope;
1949
1950         ASSERT_RTNL();
1951
1952         memset(&addr, 0, sizeof(struct in6_addr));
1953         memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
1954
1955         if (idev->dev->flags&IFF_POINTOPOINT) {
1956                 addr.s6_addr32[0] = htonl(0xfe800000);
1957                 scope = IFA_LINK;
1958         } else {
1959                 scope = IPV6_ADDR_COMPATv4;
1960         }
1961
1962         if (addr.s6_addr32[3]) {
1963                 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
1964                 if (!IS_ERR(ifp)) {
1965                         spin_lock_bh(&ifp->lock);
1966                         ifp->flags &= ~IFA_F_TENTATIVE;
1967                         spin_unlock_bh(&ifp->lock);
1968                         ipv6_ifa_notify(RTM_NEWADDR, ifp);
1969                         in6_ifa_put(ifp);
1970                 }
1971                 return;
1972         }
1973
1974         for (dev = dev_base; dev != NULL; dev = dev->next) {
1975                 struct in_device * in_dev = __in_dev_get_rtnl(dev);
1976                 if (in_dev && (dev->flags & IFF_UP)) {
1977                         struct in_ifaddr * ifa;
1978
1979                         int flag = scope;
1980
1981                         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1982                                 int plen;
1983
1984                                 addr.s6_addr32[3] = ifa->ifa_local;
1985
1986                                 if (ifa->ifa_scope == RT_SCOPE_LINK)
1987                                         continue;
1988                                 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
1989                                         if (idev->dev->flags&IFF_POINTOPOINT)
1990                                                 continue;
1991                                         flag |= IFA_HOST;
1992                                 }
1993                                 if (idev->dev->flags&IFF_POINTOPOINT)
1994                                         plen = 64;
1995                                 else
1996                                         plen = 96;
1997
1998                                 ifp = ipv6_add_addr(idev, &addr, plen, flag,
1999                                                     IFA_F_PERMANENT);
2000                                 if (!IS_ERR(ifp)) {
2001                                         spin_lock_bh(&ifp->lock);
2002                                         ifp->flags &= ~IFA_F_TENTATIVE;
2003                                         spin_unlock_bh(&ifp->lock);
2004                                         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2005                                         in6_ifa_put(ifp);
2006                                 }
2007                         }
2008                 }
2009         }
2010 }
2011
2012 static void init_loopback(struct net_device *dev)
2013 {
2014         struct inet6_dev  *idev;
2015         struct inet6_ifaddr * ifp;
2016
2017         /* ::1 */
2018
2019         ASSERT_RTNL();
2020
2021         if ((idev = ipv6_find_idev(dev)) == NULL) {
2022                 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2023                 return;
2024         }
2025
2026         ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
2027         if (!IS_ERR(ifp)) {
2028                 spin_lock_bh(&ifp->lock);
2029                 ifp->flags &= ~IFA_F_TENTATIVE;
2030                 spin_unlock_bh(&ifp->lock);
2031                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2032                 in6_ifa_put(ifp);
2033         }
2034 }
2035
2036 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2037 {
2038         struct inet6_ifaddr * ifp;
2039
2040         ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, IFA_F_PERMANENT);
2041         if (!IS_ERR(ifp)) {
2042                 addrconf_dad_start(ifp, 0);
2043                 in6_ifa_put(ifp);
2044         }
2045 }
2046
2047 static void addrconf_dev_config(struct net_device *dev)
2048 {
2049         struct in6_addr addr;
2050         struct inet6_dev    * idev;
2051
2052         ASSERT_RTNL();
2053
2054         if ((dev->type != ARPHRD_ETHER) && 
2055             (dev->type != ARPHRD_FDDI) &&
2056             (dev->type != ARPHRD_IEEE802_TR) &&
2057             (dev->type != ARPHRD_ARCNET) &&
2058             (dev->type != ARPHRD_INFINIBAND)) {
2059                 /* Alas, we support only Ethernet autoconfiguration. */
2060                 return;
2061         }
2062
2063         idev = addrconf_add_dev(dev);
2064         if (idev == NULL)
2065                 return;
2066
2067         memset(&addr, 0, sizeof(struct in6_addr));
2068         addr.s6_addr32[0] = htonl(0xFE800000);
2069
2070         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2071                 addrconf_add_linklocal(idev, &addr);
2072 }
2073
2074 static void addrconf_sit_config(struct net_device *dev)
2075 {
2076         struct inet6_dev *idev;
2077
2078         ASSERT_RTNL();
2079
2080         /* 
2081          * Configure the tunnel with one of our IPv4 
2082          * addresses... we should configure all of 
2083          * our v4 addrs in the tunnel
2084          */
2085
2086         if ((idev = ipv6_find_idev(dev)) == NULL) {
2087                 printk(KERN_DEBUG "init sit: add_dev failed\n");
2088                 return;
2089         }
2090
2091         sit_add_v4_addrs(idev);
2092
2093         if (dev->flags&IFF_POINTOPOINT) {
2094                 addrconf_add_mroute(dev);
2095                 addrconf_add_lroute(dev);
2096         } else
2097                 sit_route_add(dev);
2098 }
2099
2100 static inline int
2101 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2102 {
2103         struct in6_addr lladdr;
2104
2105         if (!ipv6_get_lladdr(link_dev, &lladdr)) {
2106                 addrconf_add_linklocal(idev, &lladdr);
2107                 return 0;
2108         }
2109         return -1;
2110 }
2111
2112 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2113 {
2114         struct net_device *link_dev;
2115
2116         /* first try to inherit the link-local address from the link device */
2117         if (idev->dev->iflink &&
2118             (link_dev = __dev_get_by_index(idev->dev->iflink))) {
2119                 if (!ipv6_inherit_linklocal(idev, link_dev))
2120                         return;
2121         }
2122         /* then try to inherit it from any device */
2123         for (link_dev = dev_base; link_dev; link_dev = link_dev->next) {
2124                 if (!ipv6_inherit_linklocal(idev, link_dev))
2125                         return;
2126         }
2127         printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2128 }
2129
2130 /*
2131  * Autoconfigure tunnel with a link-local address so routing protocols,
2132  * DHCPv6, MLD etc. can be run over the virtual link
2133  */
2134
2135 static void addrconf_ip6_tnl_config(struct net_device *dev)
2136 {
2137         struct inet6_dev *idev;
2138
2139         ASSERT_RTNL();
2140
2141         if ((idev = addrconf_add_dev(dev)) == NULL) {
2142                 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2143                 return;
2144         }
2145         ip6_tnl_add_linklocal(idev);
2146         addrconf_add_mroute(dev);
2147 }
2148
2149 static int addrconf_notify(struct notifier_block *this, unsigned long event, 
2150                            void * data)
2151 {
2152         struct net_device *dev = (struct net_device *) data;
2153         struct inet6_dev *idev = __in6_dev_get(dev);
2154         int run_pending = 0;
2155
2156         switch(event) {
2157         case NETDEV_UP:
2158         case NETDEV_CHANGE:
2159                 if (event == NETDEV_UP) {
2160                         if (!netif_carrier_ok(dev)) {
2161                                 /* device is not ready yet. */
2162                                 printk(KERN_INFO
2163                                         "ADDRCONF(NETDEV_UP): %s: "
2164                                         "link is not ready\n",
2165                                         dev->name);
2166                                 break;
2167                         }
2168
2169                         if (idev)
2170                                 idev->if_flags |= IF_READY;
2171                 } else {
2172                         if (!netif_carrier_ok(dev)) {
2173                                 /* device is still not ready. */
2174                                 break;
2175                         }
2176
2177                         if (idev) {
2178                                 if (idev->if_flags & IF_READY) {
2179                                         /* device is already configured. */
2180                                         break;
2181                                 }
2182                                 idev->if_flags |= IF_READY;
2183                         }
2184
2185                         printk(KERN_INFO
2186                                         "ADDRCONF(NETDEV_CHANGE): %s: "
2187                                         "link becomes ready\n",
2188                                         dev->name);
2189
2190                         run_pending = 1;
2191                 }
2192
2193                 switch(dev->type) {
2194                 case ARPHRD_SIT:
2195                         addrconf_sit_config(dev);
2196                         break;
2197                 case ARPHRD_TUNNEL6:
2198                         addrconf_ip6_tnl_config(dev);
2199                         break;
2200                 case ARPHRD_LOOPBACK:
2201                         init_loopback(dev);
2202                         break;
2203
2204                 default:
2205                         addrconf_dev_config(dev);
2206                         break;
2207                 };
2208                 if (idev) {
2209                         if (run_pending)
2210                                 addrconf_dad_run(idev);
2211
2212                         /* If the MTU changed during the interface down, when the
2213                            interface up, the changed MTU must be reflected in the
2214                            idev as well as routers.
2215                          */
2216                         if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2217                                 rt6_mtu_change(dev, dev->mtu);
2218                                 idev->cnf.mtu6 = dev->mtu;
2219                         }
2220                         idev->tstamp = jiffies;
2221                         inet6_ifinfo_notify(RTM_NEWLINK, idev);
2222                         /* If the changed mtu during down is lower than IPV6_MIN_MTU
2223                            stop IPv6 on this interface.
2224                          */
2225                         if (dev->mtu < IPV6_MIN_MTU)
2226                                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2227                 }
2228                 break;
2229
2230         case NETDEV_CHANGEMTU:
2231                 if ( idev && dev->mtu >= IPV6_MIN_MTU) {
2232                         rt6_mtu_change(dev, dev->mtu);
2233                         idev->cnf.mtu6 = dev->mtu;
2234                         break;
2235                 }
2236
2237                 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2238
2239         case NETDEV_DOWN:
2240         case NETDEV_UNREGISTER:
2241                 /*
2242                  *      Remove all addresses from this interface.
2243                  */
2244                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2245                 break;
2246
2247         case NETDEV_CHANGENAME:
2248 #ifdef CONFIG_SYSCTL
2249                 if (idev) {
2250                         addrconf_sysctl_unregister(&idev->cnf);
2251                         neigh_sysctl_unregister(idev->nd_parms);
2252                         neigh_sysctl_register(dev, idev->nd_parms,
2253                                               NET_IPV6, NET_IPV6_NEIGH, "ipv6",
2254                                               &ndisc_ifinfo_sysctl_change,
2255                                               NULL);
2256                         addrconf_sysctl_register(idev, &idev->cnf);
2257                 }
2258 #endif
2259                 break;
2260         };
2261
2262         return NOTIFY_OK;
2263 }
2264
2265 /*
2266  *      addrconf module should be notified of a device going up
2267  */
2268 static struct notifier_block ipv6_dev_notf = {
2269         .notifier_call = addrconf_notify,
2270         .priority = 0
2271 };
2272
2273 static int addrconf_ifdown(struct net_device *dev, int how)
2274 {
2275         struct inet6_dev *idev;
2276         struct inet6_ifaddr *ifa, **bifa;
2277         int i;
2278
2279         ASSERT_RTNL();
2280
2281         if (dev == &loopback_dev && how == 1)
2282                 how = 0;
2283
2284         rt6_ifdown(dev);
2285         neigh_ifdown(&nd_tbl, dev);
2286
2287         idev = __in6_dev_get(dev);
2288         if (idev == NULL)
2289                 return -ENODEV;
2290
2291         /* Step 1: remove reference to ipv6 device from parent device.
2292                    Do not dev_put!
2293          */
2294         if (how == 1) {
2295                 write_lock_bh(&addrconf_lock);
2296                 dev->ip6_ptr = NULL;
2297                 idev->dead = 1;
2298                 write_unlock_bh(&addrconf_lock);
2299
2300                 /* Step 1.5: remove snmp6 entry */
2301                 snmp6_unregister_dev(idev);
2302
2303         }
2304
2305         /* Step 2: clear hash table */
2306         for (i=0; i<IN6_ADDR_HSIZE; i++) {
2307                 bifa = &inet6_addr_lst[i];
2308
2309                 write_lock_bh(&addrconf_hash_lock);
2310                 while ((ifa = *bifa) != NULL) {
2311                         if (ifa->idev == idev) {
2312                                 *bifa = ifa->lst_next;
2313                                 ifa->lst_next = NULL;
2314                                 addrconf_del_timer(ifa);
2315                                 in6_ifa_put(ifa);
2316                                 continue;
2317                         }
2318                         bifa = &ifa->lst_next;
2319                 }
2320                 write_unlock_bh(&addrconf_hash_lock);
2321         }
2322
2323         write_lock_bh(&idev->lock);
2324
2325         /* Step 3: clear flags for stateless addrconf */
2326         if (how != 1)
2327                 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2328
2329         /* Step 4: clear address list */
2330 #ifdef CONFIG_IPV6_PRIVACY
2331         if (how == 1 && del_timer(&idev->regen_timer))
2332                 in6_dev_put(idev);
2333
2334         /* clear tempaddr list */
2335         while ((ifa = idev->tempaddr_list) != NULL) {
2336                 idev->tempaddr_list = ifa->tmp_next;
2337                 ifa->tmp_next = NULL;
2338                 ifa->dead = 1;
2339                 write_unlock_bh(&idev->lock);
2340                 spin_lock_bh(&ifa->lock);
2341
2342                 if (ifa->ifpub) {
2343                         in6_ifa_put(ifa->ifpub);
2344                         ifa->ifpub = NULL;
2345                 }
2346                 spin_unlock_bh(&ifa->lock);
2347                 in6_ifa_put(ifa);
2348                 write_lock_bh(&idev->lock);
2349         }
2350 #endif
2351         while ((ifa = idev->addr_list) != NULL) {
2352                 idev->addr_list = ifa->if_next;
2353                 ifa->if_next = NULL;
2354                 ifa->dead = 1;
2355                 addrconf_del_timer(ifa);
2356                 write_unlock_bh(&idev->lock);
2357
2358                 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2359                 in6_ifa_put(ifa);
2360
2361                 write_lock_bh(&idev->lock);
2362         }
2363         write_unlock_bh(&idev->lock);
2364
2365         /* Step 5: Discard multicast list */
2366
2367         if (how == 1)
2368                 ipv6_mc_destroy_dev(idev);
2369         else
2370                 ipv6_mc_down(idev);
2371
2372         /* Step 5: netlink notification of this interface */
2373         idev->tstamp = jiffies;
2374         inet6_ifinfo_notify(RTM_DELLINK, idev);
2375         
2376         /* Shot the device (if unregistered) */
2377
2378         if (how == 1) {
2379 #ifdef CONFIG_SYSCTL
2380                 addrconf_sysctl_unregister(&idev->cnf);
2381                 neigh_sysctl_unregister(idev->nd_parms);
2382 #endif
2383                 neigh_parms_release(&nd_tbl, idev->nd_parms);
2384                 neigh_ifdown(&nd_tbl, dev);
2385                 in6_dev_put(idev);
2386         }
2387         return 0;
2388 }
2389
2390 static void addrconf_rs_timer(unsigned long data)
2391 {
2392         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2393
2394         if (ifp->idev->cnf.forwarding)
2395                 goto out;
2396
2397         if (ifp->idev->if_flags & IF_RA_RCVD) {
2398                 /*
2399                  *      Announcement received after solicitation
2400                  *      was sent
2401                  */
2402                 goto out;
2403         }
2404
2405         spin_lock(&ifp->lock);
2406         if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2407                 struct in6_addr all_routers;
2408
2409                 /* The wait after the last probe can be shorter */
2410                 addrconf_mod_timer(ifp, AC_RS,
2411                                    (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2412                                    ifp->idev->cnf.rtr_solicit_delay :
2413                                    ifp->idev->cnf.rtr_solicit_interval);
2414                 spin_unlock(&ifp->lock);
2415
2416                 ipv6_addr_all_routers(&all_routers);
2417
2418                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2419         } else {
2420                 spin_unlock(&ifp->lock);
2421                 /*
2422                  * Note: we do not support deprecated "all on-link"
2423                  * assumption any longer.
2424                  */
2425                 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2426                        ifp->idev->dev->name);
2427         }
2428
2429 out:
2430         in6_ifa_put(ifp);
2431 }
2432
2433 /*
2434  *      Duplicate Address Detection
2435  */
2436 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2437 {
2438         unsigned long rand_num;
2439         struct inet6_dev *idev = ifp->idev;
2440
2441         rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2442         ifp->probes = idev->cnf.dad_transmits;
2443         addrconf_mod_timer(ifp, AC_DAD, rand_num);
2444 }
2445
2446 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2447 {
2448         struct inet6_dev *idev = ifp->idev;
2449         struct net_device *dev = idev->dev;
2450
2451         addrconf_join_solict(dev, &ifp->addr);
2452
2453         if (ifp->prefix_len != 128 && (ifp->flags&IFA_F_PERMANENT))
2454                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 0,
2455                                         flags);
2456
2457         net_srandom(ifp->addr.s6_addr32[3]);
2458
2459         read_lock_bh(&idev->lock);
2460         if (ifp->dead)
2461                 goto out;
2462         spin_lock_bh(&ifp->lock);
2463
2464         if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2465             !(ifp->flags&IFA_F_TENTATIVE)) {
2466                 ifp->flags &= ~IFA_F_TENTATIVE;
2467                 spin_unlock_bh(&ifp->lock);
2468                 read_unlock_bh(&idev->lock);
2469
2470                 addrconf_dad_completed(ifp);
2471                 return;
2472         }
2473
2474         if (!(idev->if_flags & IF_READY)) {
2475                 spin_unlock_bh(&ifp->lock);
2476                 read_unlock_bh(&idev->lock);
2477                 /*
2478                  * If the defice is not ready:
2479                  * - keep it tentative if it is a permanent address.
2480                  * - otherwise, kill it.
2481                  */
2482                 in6_ifa_hold(ifp);
2483                 addrconf_dad_stop(ifp);
2484                 return;
2485         }
2486         addrconf_dad_kick(ifp);
2487         spin_unlock_bh(&ifp->lock);
2488 out:
2489         read_unlock_bh(&idev->lock);
2490 }
2491
2492 static void addrconf_dad_timer(unsigned long data)
2493 {
2494         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2495         struct inet6_dev *idev = ifp->idev;
2496         struct in6_addr unspec;
2497         struct in6_addr mcaddr;
2498
2499         read_lock_bh(&idev->lock);
2500         if (idev->dead) {
2501                 read_unlock_bh(&idev->lock);
2502                 goto out;
2503         }
2504         spin_lock_bh(&ifp->lock);
2505         if (ifp->probes == 0) {
2506                 /*
2507                  * DAD was successful
2508                  */
2509
2510                 ifp->flags &= ~IFA_F_TENTATIVE;
2511                 spin_unlock_bh(&ifp->lock);
2512                 read_unlock_bh(&idev->lock);
2513
2514                 addrconf_dad_completed(ifp);
2515
2516                 goto out;
2517         }
2518
2519         ifp->probes--;
2520         addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2521         spin_unlock_bh(&ifp->lock);
2522         read_unlock_bh(&idev->lock);
2523
2524         /* send a neighbour solicitation for our addr */
2525         memset(&unspec, 0, sizeof(unspec));
2526         addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2527         ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec);
2528 out:
2529         in6_ifa_put(ifp);
2530 }
2531
2532 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2533 {
2534         struct net_device *     dev = ifp->idev->dev;
2535
2536         /*
2537          *      Configure the address for reception. Now it is valid.
2538          */
2539
2540         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2541
2542         /* If added prefix is link local and forwarding is off,
2543            start sending router solicitations.
2544          */
2545
2546         if (ifp->idev->cnf.forwarding == 0 &&
2547             ifp->idev->cnf.rtr_solicits > 0 &&
2548             (dev->flags&IFF_LOOPBACK) == 0 &&
2549             (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2550                 struct in6_addr all_routers;
2551
2552                 ipv6_addr_all_routers(&all_routers);
2553
2554                 /*
2555                  *      If a host as already performed a random delay
2556                  *      [...] as part of DAD [...] there is no need
2557                  *      to delay again before sending the first RS
2558                  */
2559                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2560
2561                 spin_lock_bh(&ifp->lock);
2562                 ifp->probes = 1;
2563                 ifp->idev->if_flags |= IF_RS_SENT;
2564                 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2565                 spin_unlock_bh(&ifp->lock);
2566         }
2567 }
2568
2569 static void addrconf_dad_run(struct inet6_dev *idev) {
2570         struct inet6_ifaddr *ifp;
2571
2572         read_lock_bh(&idev->lock);
2573         for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2574                 spin_lock_bh(&ifp->lock);
2575                 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2576                         spin_unlock_bh(&ifp->lock);
2577                         continue;
2578                 }
2579                 spin_unlock_bh(&ifp->lock);
2580                 addrconf_dad_kick(ifp);
2581         }
2582         read_unlock_bh(&idev->lock);
2583 }
2584
2585 #ifdef CONFIG_PROC_FS
2586 struct if6_iter_state {
2587         int bucket;
2588 };
2589
2590 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2591 {
2592         struct inet6_ifaddr *ifa = NULL;
2593         struct if6_iter_state *state = seq->private;
2594
2595         for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2596                 ifa = inet6_addr_lst[state->bucket];
2597                 if (ifa)
2598                         break;
2599         }
2600         return ifa;
2601 }
2602
2603 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2604 {
2605         struct if6_iter_state *state = seq->private;
2606
2607         ifa = ifa->lst_next;
2608 try_again:
2609         if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2610                 ifa = inet6_addr_lst[state->bucket];
2611                 goto try_again;
2612         }
2613         return ifa;
2614 }
2615
2616 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2617 {
2618         struct inet6_ifaddr *ifa = if6_get_first(seq);
2619
2620         if (ifa)
2621                 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2622                         --pos;
2623         return pos ? NULL : ifa;
2624 }
2625
2626 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2627 {
2628         read_lock_bh(&addrconf_hash_lock);
2629         return if6_get_idx(seq, *pos);
2630 }
2631
2632 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2633 {
2634         struct inet6_ifaddr *ifa;
2635
2636         ifa = if6_get_next(seq, v);
2637         ++*pos;
2638         return ifa;
2639 }
2640
2641 static void if6_seq_stop(struct seq_file *seq, void *v)
2642 {
2643         read_unlock_bh(&addrconf_hash_lock);
2644 }
2645
2646 static int if6_seq_show(struct seq_file *seq, void *v)
2647 {
2648         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2649         seq_printf(seq,
2650                    NIP6_SEQFMT " %02x %02x %02x %02x %8s\n",
2651                    NIP6(ifp->addr),
2652                    ifp->idev->dev->ifindex,
2653                    ifp->prefix_len,
2654                    ifp->scope,
2655                    ifp->flags,
2656                    ifp->idev->dev->name);
2657         return 0;
2658 }
2659
2660 static struct seq_operations if6_seq_ops = {
2661         .start  = if6_seq_start,
2662         .next   = if6_seq_next,
2663         .show   = if6_seq_show,
2664         .stop   = if6_seq_stop,
2665 };
2666
2667 static int if6_seq_open(struct inode *inode, struct file *file)
2668 {
2669         struct seq_file *seq;
2670         int rc = -ENOMEM;
2671         struct if6_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL);
2672
2673         if (!s)
2674                 goto out;
2675         memset(s, 0, sizeof(*s));
2676
2677         rc = seq_open(file, &if6_seq_ops);
2678         if (rc)
2679                 goto out_kfree;
2680
2681         seq = file->private_data;
2682         seq->private = s;
2683 out:
2684         return rc;
2685 out_kfree:
2686         kfree(s);
2687         goto out;
2688 }
2689
2690 static struct file_operations if6_fops = {
2691         .owner          = THIS_MODULE,
2692         .open           = if6_seq_open,
2693         .read           = seq_read,
2694         .llseek         = seq_lseek,
2695         .release        = seq_release_private,
2696 };
2697
2698 int __init if6_proc_init(void)
2699 {
2700         if (!proc_net_fops_create("if_inet6", S_IRUGO, &if6_fops))
2701                 return -ENOMEM;
2702         return 0;
2703 }
2704
2705 void if6_proc_exit(void)
2706 {
2707         proc_net_remove("if_inet6");
2708 }
2709 #endif  /* CONFIG_PROC_FS */
2710
2711 /*
2712  *      Periodic address status verification
2713  */
2714
2715 static void addrconf_verify(unsigned long foo)
2716 {
2717         struct inet6_ifaddr *ifp;
2718         unsigned long now, next;
2719         int i;
2720
2721         spin_lock_bh(&addrconf_verify_lock);
2722         now = jiffies;
2723         next = now + ADDR_CHECK_FREQUENCY;
2724
2725         del_timer(&addr_chk_timer);
2726
2727         for (i=0; i < IN6_ADDR_HSIZE; i++) {
2728
2729 restart:
2730                 read_lock(&addrconf_hash_lock);
2731                 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
2732                         unsigned long age;
2733 #ifdef CONFIG_IPV6_PRIVACY
2734                         unsigned long regen_advance;
2735 #endif
2736
2737                         if (ifp->flags & IFA_F_PERMANENT)
2738                                 continue;
2739
2740                         spin_lock(&ifp->lock);
2741                         age = (now - ifp->tstamp) / HZ;
2742
2743 #ifdef CONFIG_IPV6_PRIVACY
2744                         regen_advance = ifp->idev->cnf.regen_max_retry * 
2745                                         ifp->idev->cnf.dad_transmits * 
2746                                         ifp->idev->nd_parms->retrans_time / HZ;
2747 #endif
2748
2749                         if (age >= ifp->valid_lft) {
2750                                 spin_unlock(&ifp->lock);
2751                                 in6_ifa_hold(ifp);
2752                                 read_unlock(&addrconf_hash_lock);
2753                                 ipv6_del_addr(ifp);
2754                                 goto restart;
2755                         } else if (age >= ifp->prefered_lft) {
2756                                 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
2757                                 int deprecate = 0;
2758
2759                                 if (!(ifp->flags&IFA_F_DEPRECATED)) {
2760                                         deprecate = 1;
2761                                         ifp->flags |= IFA_F_DEPRECATED;
2762                                 }
2763
2764                                 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
2765                                         next = ifp->tstamp + ifp->valid_lft * HZ;
2766
2767                                 spin_unlock(&ifp->lock);
2768
2769                                 if (deprecate) {
2770                                         in6_ifa_hold(ifp);
2771                                         read_unlock(&addrconf_hash_lock);
2772
2773                                         ipv6_ifa_notify(0, ifp);
2774                                         in6_ifa_put(ifp);
2775                                         goto restart;
2776                                 }
2777 #ifdef CONFIG_IPV6_PRIVACY
2778                         } else if ((ifp->flags&IFA_F_TEMPORARY) &&
2779                                    !(ifp->flags&IFA_F_TENTATIVE)) {
2780                                 if (age >= ifp->prefered_lft - regen_advance) {
2781                                         struct inet6_ifaddr *ifpub = ifp->ifpub;
2782                                         if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2783                                                 next = ifp->tstamp + ifp->prefered_lft * HZ;
2784                                         if (!ifp->regen_count && ifpub) {
2785                                                 ifp->regen_count++;
2786                                                 in6_ifa_hold(ifp);
2787                                                 in6_ifa_hold(ifpub);
2788                                                 spin_unlock(&ifp->lock);
2789                                                 read_unlock(&addrconf_hash_lock);
2790                                                 spin_lock(&ifpub->lock);
2791                                                 ifpub->regen_count = 0;
2792                                                 spin_unlock(&ifpub->lock);
2793                                                 ipv6_create_tempaddr(ifpub, ifp);
2794                                                 in6_ifa_put(ifpub);
2795                                                 in6_ifa_put(ifp);
2796                                                 goto restart;
2797                                         }
2798                                 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
2799                                         next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
2800                                 spin_unlock(&ifp->lock);
2801 #endif
2802                         } else {
2803                                 /* ifp->prefered_lft <= ifp->valid_lft */
2804                                 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2805                                         next = ifp->tstamp + ifp->prefered_lft * HZ;
2806                                 spin_unlock(&ifp->lock);
2807                         }
2808                 }
2809                 read_unlock(&addrconf_hash_lock);
2810         }
2811
2812         addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
2813         add_timer(&addr_chk_timer);
2814         spin_unlock_bh(&addrconf_verify_lock);
2815 }
2816
2817 static int
2818 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
2819 {
2820         struct rtattr **rta = arg;
2821         struct ifaddrmsg *ifm = NLMSG_DATA(nlh);
2822         struct in6_addr *pfx;
2823
2824         pfx = NULL;
2825         if (rta[IFA_ADDRESS-1]) {
2826                 if (RTA_PAYLOAD(rta[IFA_ADDRESS-1]) < sizeof(*pfx))
2827                         return -EINVAL;
2828                 pfx = RTA_DATA(rta[IFA_ADDRESS-1]);
2829         }
2830         if (rta[IFA_LOCAL-1]) {
2831                 if (pfx && memcmp(pfx, RTA_DATA(rta[IFA_LOCAL-1]), sizeof(*pfx)))
2832                         return -EINVAL;
2833                 pfx = RTA_DATA(rta[IFA_LOCAL-1]);
2834         }
2835         if (pfx == NULL)
2836                 return -EINVAL;
2837
2838         return inet6_addr_del(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
2839 }
2840
2841 static int
2842 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
2843 {
2844         struct rtattr  **rta = arg;
2845         struct ifaddrmsg *ifm = NLMSG_DATA(nlh);
2846         struct in6_addr *pfx;
2847
2848         pfx = NULL;
2849         if (rta[IFA_ADDRESS-1]) {
2850                 if (RTA_PAYLOAD(rta[IFA_ADDRESS-1]) < sizeof(*pfx))
2851                         return -EINVAL;
2852                 pfx = RTA_DATA(rta[IFA_ADDRESS-1]);
2853         }
2854         if (rta[IFA_LOCAL-1]) {
2855                 if (pfx && memcmp(pfx, RTA_DATA(rta[IFA_LOCAL-1]), sizeof(*pfx)))
2856                         return -EINVAL;
2857                 pfx = RTA_DATA(rta[IFA_LOCAL-1]);
2858         }
2859         if (pfx == NULL)
2860                 return -EINVAL;
2861
2862         return inet6_addr_add(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
2863 }
2864
2865 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
2866                              u32 pid, u32 seq, int event, unsigned int flags)
2867 {
2868         struct ifaddrmsg *ifm;
2869         struct nlmsghdr  *nlh;
2870         struct ifa_cacheinfo ci;
2871         unsigned char    *b = skb->tail;
2872
2873         nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags);
2874         ifm = NLMSG_DATA(nlh);
2875         ifm->ifa_family = AF_INET6;
2876         ifm->ifa_prefixlen = ifa->prefix_len;
2877         ifm->ifa_flags = ifa->flags;
2878         ifm->ifa_scope = RT_SCOPE_UNIVERSE;
2879         if (ifa->scope&IFA_HOST)
2880                 ifm->ifa_scope = RT_SCOPE_HOST;
2881         else if (ifa->scope&IFA_LINK)
2882                 ifm->ifa_scope = RT_SCOPE_LINK;
2883         else if (ifa->scope&IFA_SITE)
2884                 ifm->ifa_scope = RT_SCOPE_SITE;
2885         ifm->ifa_index = ifa->idev->dev->ifindex;
2886         RTA_PUT(skb, IFA_ADDRESS, 16, &ifa->addr);
2887         if (!(ifa->flags&IFA_F_PERMANENT)) {
2888                 ci.ifa_prefered = ifa->prefered_lft;
2889                 ci.ifa_valid = ifa->valid_lft;
2890                 if (ci.ifa_prefered != INFINITY_LIFE_TIME) {
2891                         long tval = (jiffies - ifa->tstamp)/HZ;
2892                         ci.ifa_prefered -= tval;
2893                         if (ci.ifa_valid != INFINITY_LIFE_TIME)
2894                                 ci.ifa_valid -= tval;
2895                 }
2896         } else {
2897                 ci.ifa_prefered = INFINITY_LIFE_TIME;
2898                 ci.ifa_valid = INFINITY_LIFE_TIME;
2899         }
2900         ci.cstamp = (__u32)(TIME_DELTA(ifa->cstamp, INITIAL_JIFFIES) / HZ * 100
2901                     + TIME_DELTA(ifa->cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
2902         ci.tstamp = (__u32)(TIME_DELTA(ifa->tstamp, INITIAL_JIFFIES) / HZ * 100
2903                     + TIME_DELTA(ifa->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
2904         RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci);
2905         nlh->nlmsg_len = skb->tail - b;
2906         return skb->len;
2907
2908 nlmsg_failure:
2909 rtattr_failure:
2910         skb_trim(skb, b - skb->data);
2911         return -1;
2912 }
2913
2914 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
2915                                 u32 pid, u32 seq, int event, u16 flags)
2916 {
2917         struct ifaddrmsg *ifm;
2918         struct nlmsghdr  *nlh;
2919         struct ifa_cacheinfo ci;
2920         unsigned char    *b = skb->tail;
2921
2922         nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags);
2923         ifm = NLMSG_DATA(nlh);
2924         ifm->ifa_family = AF_INET6;     
2925         ifm->ifa_prefixlen = 128;
2926         ifm->ifa_flags = IFA_F_PERMANENT;
2927         ifm->ifa_scope = RT_SCOPE_UNIVERSE;
2928         if (ipv6_addr_scope(&ifmca->mca_addr)&IFA_SITE)
2929                 ifm->ifa_scope = RT_SCOPE_SITE;
2930         ifm->ifa_index = ifmca->idev->dev->ifindex;
2931         RTA_PUT(skb, IFA_MULTICAST, 16, &ifmca->mca_addr);
2932         ci.cstamp = (__u32)(TIME_DELTA(ifmca->mca_cstamp, INITIAL_JIFFIES) / HZ
2933                     * 100 + TIME_DELTA(ifmca->mca_cstamp, INITIAL_JIFFIES) % HZ
2934                     * 100 / HZ);
2935         ci.tstamp = (__u32)(TIME_DELTA(ifmca->mca_tstamp, INITIAL_JIFFIES) / HZ
2936                     * 100 + TIME_DELTA(ifmca->mca_tstamp, INITIAL_JIFFIES) % HZ
2937                     * 100 / HZ);
2938         ci.ifa_prefered = INFINITY_LIFE_TIME;
2939         ci.ifa_valid = INFINITY_LIFE_TIME;
2940         RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci);
2941         nlh->nlmsg_len = skb->tail - b;
2942         return skb->len;
2943
2944 nlmsg_failure:
2945 rtattr_failure:
2946         skb_trim(skb, b - skb->data);
2947         return -1;
2948 }
2949
2950 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
2951                                 u32 pid, u32 seq, int event, unsigned int flags)
2952 {
2953         struct ifaddrmsg *ifm;
2954         struct nlmsghdr  *nlh;
2955         struct ifa_cacheinfo ci;
2956         unsigned char    *b = skb->tail;
2957
2958         nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags);
2959         ifm = NLMSG_DATA(nlh);
2960         ifm->ifa_family = AF_INET6;     
2961         ifm->ifa_prefixlen = 128;
2962         ifm->ifa_flags = IFA_F_PERMANENT;
2963         ifm->ifa_scope = RT_SCOPE_UNIVERSE;
2964         if (ipv6_addr_scope(&ifaca->aca_addr)&IFA_SITE)
2965                 ifm->ifa_scope = RT_SCOPE_SITE;
2966         ifm->ifa_index = ifaca->aca_idev->dev->ifindex;
2967         RTA_PUT(skb, IFA_ANYCAST, 16, &ifaca->aca_addr);
2968         ci.cstamp = (__u32)(TIME_DELTA(ifaca->aca_cstamp, INITIAL_JIFFIES) / HZ
2969                     * 100 + TIME_DELTA(ifaca->aca_cstamp, INITIAL_JIFFIES) % HZ
2970                     * 100 / HZ);
2971         ci.tstamp = (__u32)(TIME_DELTA(ifaca->aca_tstamp, INITIAL_JIFFIES) / HZ
2972                     * 100 + TIME_DELTA(ifaca->aca_tstamp, INITIAL_JIFFIES) % HZ
2973                     * 100 / HZ);
2974         ci.ifa_prefered = INFINITY_LIFE_TIME;
2975         ci.ifa_valid = INFINITY_LIFE_TIME;
2976         RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci);
2977         nlh->nlmsg_len = skb->tail - b;
2978         return skb->len;
2979
2980 nlmsg_failure:
2981 rtattr_failure:
2982         skb_trim(skb, b - skb->data);
2983         return -1;
2984 }
2985
2986 enum addr_type_t
2987 {
2988         UNICAST_ADDR,
2989         MULTICAST_ADDR,
2990         ANYCAST_ADDR,
2991 };
2992
2993 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
2994                            enum addr_type_t type)
2995 {
2996         int idx, ip_idx;
2997         int s_idx, s_ip_idx;
2998         int err = 1;
2999         struct net_device *dev;
3000         struct inet6_dev *idev = NULL;
3001         struct inet6_ifaddr *ifa;
3002         struct ifmcaddr6 *ifmca;
3003         struct ifacaddr6 *ifaca;
3004
3005         s_idx = cb->args[0];
3006         s_ip_idx = ip_idx = cb->args[1];
3007         read_lock(&dev_base_lock);
3008         
3009         for (dev = dev_base, idx = 0; dev; dev = dev->next, idx++) {
3010                 if (idx < s_idx)
3011                         continue;
3012                 if (idx > s_idx)
3013                         s_ip_idx = 0;
3014                 ip_idx = 0;
3015                 if ((idev = in6_dev_get(dev)) == NULL)
3016                         continue;
3017                 read_lock_bh(&idev->lock);
3018                 switch (type) {
3019                 case UNICAST_ADDR:
3020                         /* unicast address incl. temp addr */
3021                         for (ifa = idev->addr_list; ifa;
3022                              ifa = ifa->if_next, ip_idx++) {
3023                                 if (ip_idx < s_ip_idx)
3024                                         continue;
3025                                 if ((err = inet6_fill_ifaddr(skb, ifa, 
3026                                     NETLINK_CB(cb->skb).pid, 
3027                                     cb->nlh->nlmsg_seq, RTM_NEWADDR,
3028                                     NLM_F_MULTI)) <= 0)
3029                                         goto done;
3030                         }
3031                         break;
3032                 case MULTICAST_ADDR:
3033                         /* multicast address */
3034                         for (ifmca = idev->mc_list; ifmca; 
3035                              ifmca = ifmca->next, ip_idx++) {
3036                                 if (ip_idx < s_ip_idx)
3037                                         continue;
3038                                 if ((err = inet6_fill_ifmcaddr(skb, ifmca, 
3039                                     NETLINK_CB(cb->skb).pid, 
3040                                     cb->nlh->nlmsg_seq, RTM_GETMULTICAST,
3041                                     NLM_F_MULTI)) <= 0)
3042                                         goto done;
3043                         }
3044                         break;
3045                 case ANYCAST_ADDR:
3046                         /* anycast address */
3047                         for (ifaca = idev->ac_list; ifaca;
3048                              ifaca = ifaca->aca_next, ip_idx++) {
3049                                 if (ip_idx < s_ip_idx)
3050                                         continue;
3051                                 if ((err = inet6_fill_ifacaddr(skb, ifaca, 
3052                                     NETLINK_CB(cb->skb).pid, 
3053                                     cb->nlh->nlmsg_seq, RTM_GETANYCAST,
3054                                     NLM_F_MULTI)) <= 0) 
3055                                         goto done;
3056                         }
3057                         break;
3058                 default:
3059                         break;
3060                 }
3061                 read_unlock_bh(&idev->lock);
3062                 in6_dev_put(idev);
3063         }
3064 done:
3065         if (err <= 0) {
3066                 read_unlock_bh(&idev->lock);
3067                 in6_dev_put(idev);
3068         }
3069         read_unlock(&dev_base_lock);
3070         cb->args[0] = idx;
3071         cb->args[1] = ip_idx;
3072         return skb->len;
3073 }
3074
3075 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3076 {
3077         enum addr_type_t type = UNICAST_ADDR;
3078         return inet6_dump_addr(skb, cb, type);
3079 }
3080
3081 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3082 {
3083         enum addr_type_t type = MULTICAST_ADDR;
3084         return inet6_dump_addr(skb, cb, type);
3085 }
3086
3087
3088 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3089 {
3090         enum addr_type_t type = ANYCAST_ADDR;
3091         return inet6_dump_addr(skb, cb, type);
3092 }
3093
3094 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3095 {
3096         struct sk_buff *skb;
3097         int size = NLMSG_SPACE(sizeof(struct ifaddrmsg)+128);
3098
3099         skb = alloc_skb(size, GFP_ATOMIC);
3100         if (!skb) {
3101                 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFADDR, ENOBUFS);
3102                 return;
3103         }
3104         if (inet6_fill_ifaddr(skb, ifa, current->pid, 0, event, 0) < 0) {
3105                 kfree_skb(skb);
3106                 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFADDR, EINVAL);
3107                 return;
3108         }
3109         NETLINK_CB(skb).dst_group = RTNLGRP_IPV6_IFADDR;
3110         netlink_broadcast(rtnl, skb, 0, RTNLGRP_IPV6_IFADDR, GFP_ATOMIC);
3111 }
3112
3113 static void inline ipv6_store_devconf(struct ipv6_devconf *cnf,
3114                                 __s32 *array, int bytes)
3115 {
3116         memset(array, 0, bytes);
3117         array[DEVCONF_FORWARDING] = cnf->forwarding;
3118         array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3119         array[DEVCONF_MTU6] = cnf->mtu6;
3120         array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3121         array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3122         array[DEVCONF_AUTOCONF] = cnf->autoconf;
3123         array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3124         array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3125         array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3126         array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3127         array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3128 #ifdef CONFIG_IPV6_PRIVACY
3129         array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3130         array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3131         array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3132         array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3133         array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3134 #endif
3135         array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3136 }
3137
3138 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 
3139                              u32 pid, u32 seq, int event, unsigned int flags)
3140 {
3141         struct net_device       *dev = idev->dev;
3142         __s32                   *array = NULL;
3143         struct ifinfomsg        *r;
3144         struct nlmsghdr         *nlh;
3145         unsigned char           *b = skb->tail;
3146         struct rtattr           *subattr;
3147         __u32                   mtu = dev->mtu;
3148         struct ifla_cacheinfo   ci;
3149
3150         nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*r), flags);
3151         r = NLMSG_DATA(nlh);
3152         r->ifi_family = AF_INET6;
3153         r->__ifi_pad = 0;
3154         r->ifi_type = dev->type;
3155         r->ifi_index = dev->ifindex;
3156         r->ifi_flags = dev_get_flags(dev);
3157         r->ifi_change = 0;
3158
3159         RTA_PUT(skb, IFLA_IFNAME, strlen(dev->name)+1, dev->name);
3160
3161         if (dev->addr_len)
3162                 RTA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3163
3164         RTA_PUT(skb, IFLA_MTU, sizeof(mtu), &mtu);
3165         if (dev->ifindex != dev->iflink)
3166                 RTA_PUT(skb, IFLA_LINK, sizeof(int), &dev->iflink);
3167                         
3168         subattr = (struct rtattr*)skb->tail;
3169
3170         RTA_PUT(skb, IFLA_PROTINFO, 0, NULL);
3171
3172         /* return the device flags */
3173         RTA_PUT(skb, IFLA_INET6_FLAGS, sizeof(__u32), &idev->if_flags);
3174
3175         /* return interface cacheinfo */
3176         ci.max_reasm_len = IPV6_MAXPLEN;
3177         ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3178                     + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3179         ci.reachable_time = idev->nd_parms->reachable_time;
3180         ci.retrans_time = idev->nd_parms->retrans_time;
3181         RTA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3182         
3183         /* return the device sysctl params */
3184         if ((array = kmalloc(DEVCONF_MAX * sizeof(*array), GFP_ATOMIC)) == NULL)
3185                 goto rtattr_failure;
3186         ipv6_store_devconf(&idev->cnf, array, DEVCONF_MAX * sizeof(*array));
3187         RTA_PUT(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(*array), array);
3188
3189         /* XXX - Statistics/MC not implemented */
3190         subattr->rta_len = skb->tail - (u8*)subattr;
3191
3192         nlh->nlmsg_len = skb->tail - b;
3193         kfree(array);
3194         return skb->len;
3195
3196 nlmsg_failure:
3197 rtattr_failure:
3198         kfree(array);
3199         skb_trim(skb, b - skb->data);
3200         return -1;
3201 }
3202
3203 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3204 {
3205         int idx, err;
3206         int s_idx = cb->args[0];
3207         struct net_device *dev;
3208         struct inet6_dev *idev;
3209
3210         read_lock(&dev_base_lock);
3211         for (dev=dev_base, idx=0; dev; dev = dev->next, idx++) {
3212                 if (idx < s_idx)
3213                         continue;
3214                 if ((idev = in6_dev_get(dev)) == NULL)
3215                         continue;
3216                 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid, 
3217                                 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
3218                 in6_dev_put(idev);
3219                 if (err <= 0)
3220                         break;
3221         }
3222         read_unlock(&dev_base_lock);
3223         cb->args[0] = idx;
3224
3225         return skb->len;
3226 }
3227
3228 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3229 {
3230         struct sk_buff *skb;
3231         /* 128 bytes ?? */
3232         int size = NLMSG_SPACE(sizeof(struct ifinfomsg)+128);
3233         
3234         skb = alloc_skb(size, GFP_ATOMIC);
3235         if (!skb) {
3236                 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFINFO, ENOBUFS);
3237                 return;
3238         }
3239         if (inet6_fill_ifinfo(skb, idev, current->pid, 0, event, 0) < 0) {