[PATCH] create a kstrdup library function
[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  */
39
40 #include <linux/config.h>
41 #include <linux/errno.h>
42 #include <linux/types.h>
43 #include <linux/socket.h>
44 #include <linux/sockios.h>
45 #include <linux/sched.h>
46 #include <linux/net.h>
47 #include <linux/in6.h>
48 #include <linux/netdevice.h>
49 #include <linux/if_arp.h>
50 #include <linux/if_arcnet.h>
51 #include <linux/if_infiniband.h>
52 #include <linux/route.h>
53 #include <linux/inetdevice.h>
54 #include <linux/init.h>
55 #ifdef CONFIG_SYSCTL
56 #include <linux/sysctl.h>
57 #endif
58 #include <linux/delay.h>
59 #include <linux/notifier.h>
60 #include <linux/string.h>
61
62 #include <net/sock.h>
63 #include <net/snmp.h>
64
65 #include <net/ipv6.h>
66 #include <net/protocol.h>
67 #include <net/ndisc.h>
68 #include <net/ip6_route.h>
69 #include <net/addrconf.h>
70 #include <net/tcp.h>
71 #include <net/ip.h>
72 #include <linux/if_tunnel.h>
73 #include <linux/rtnetlink.h>
74
75 #ifdef CONFIG_IPV6_PRIVACY
76 #include <linux/random.h>
77 #include <linux/crypto.h>
78 #include <asm/scatterlist.h>
79 #endif
80
81 #include <asm/uaccess.h>
82
83 #include <linux/proc_fs.h>
84 #include <linux/seq_file.h>
85
86 /* Set to 3 to get tracing... */
87 #define ACONF_DEBUG 2
88
89 #if ACONF_DEBUG >= 3
90 #define ADBG(x) printk x
91 #else
92 #define ADBG(x)
93 #endif
94
95 #define INFINITY_LIFE_TIME      0xFFFFFFFF
96 #define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b)))
97
98 #ifdef CONFIG_SYSCTL
99 static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p);
100 static void addrconf_sysctl_unregister(struct ipv6_devconf *p);
101 #endif
102
103 #ifdef CONFIG_IPV6_PRIVACY
104 static int __ipv6_regen_rndid(struct inet6_dev *idev);
105 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr); 
106 static void ipv6_regen_rndid(unsigned long data);
107
108 static int desync_factor = MAX_DESYNC_FACTOR * HZ;
109 static struct crypto_tfm *md5_tfm;
110 static DEFINE_SPINLOCK(md5_tfm_lock);
111 #endif
112
113 static int ipv6_count_addresses(struct inet6_dev *idev);
114
115 /*
116  *      Configured unicast address hash table
117  */
118 static struct inet6_ifaddr              *inet6_addr_lst[IN6_ADDR_HSIZE];
119 static DEFINE_RWLOCK(addrconf_hash_lock);
120
121 /* Protects inet6 devices */
122 DEFINE_RWLOCK(addrconf_lock);
123
124 static void addrconf_verify(unsigned long);
125
126 static struct timer_list addr_chk_timer =
127                         TIMER_INITIALIZER(addrconf_verify, 0, 0);
128 static DEFINE_SPINLOCK(addrconf_verify_lock);
129
130 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
131 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
132
133 static int addrconf_ifdown(struct net_device *dev, int how);
134
135 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
136 static void addrconf_dad_timer(unsigned long data);
137 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
138 static void addrconf_rs_timer(unsigned long data);
139 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
140 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
141
142 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 
143                                 struct prefix_info *pinfo);
144 static int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev);
145
146 static struct notifier_block *inet6addr_chain;
147
148 struct ipv6_devconf ipv6_devconf = {
149         .forwarding             = 0,
150         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
151         .mtu6                   = IPV6_MIN_MTU,
152         .accept_ra              = 1,
153         .accept_redirects       = 1,
154         .autoconf               = 1,
155         .force_mld_version      = 0,
156         .dad_transmits          = 1,
157         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
158         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
159         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
160 #ifdef CONFIG_IPV6_PRIVACY
161         .use_tempaddr           = 0,
162         .temp_valid_lft         = TEMP_VALID_LIFETIME,
163         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
164         .regen_max_retry        = REGEN_MAX_RETRY,
165         .max_desync_factor      = MAX_DESYNC_FACTOR,
166 #endif
167         .max_addresses          = IPV6_MAX_ADDRESSES,
168 };
169
170 static struct ipv6_devconf ipv6_devconf_dflt = {
171         .forwarding             = 0,
172         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
173         .mtu6                   = IPV6_MIN_MTU,
174         .accept_ra              = 1,
175         .accept_redirects       = 1,
176         .autoconf               = 1,
177         .dad_transmits          = 1,
178         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
179         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
180         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
181 #ifdef CONFIG_IPV6_PRIVACY
182         .use_tempaddr           = 0,
183         .temp_valid_lft         = TEMP_VALID_LIFETIME,
184         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
185         .regen_max_retry        = REGEN_MAX_RETRY,
186         .max_desync_factor      = MAX_DESYNC_FACTOR,
187 #endif
188         .max_addresses          = IPV6_MAX_ADDRESSES,
189 };
190
191 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
192 #if 0
193 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
194 #endif
195 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
196
197 int ipv6_addr_type(const struct in6_addr *addr)
198 {
199         int type;
200         u32 st;
201
202         st = addr->s6_addr32[0];
203
204         if ((st & htonl(0xFF000000)) == htonl(0xFF000000)) {
205                 type = IPV6_ADDR_MULTICAST;
206
207                 switch((st & htonl(0x00FF0000))) {
208                         case __constant_htonl(0x00010000):
209                                 type |= IPV6_ADDR_LOOPBACK;
210                                 break;
211
212                         case __constant_htonl(0x00020000):
213                                 type |= IPV6_ADDR_LINKLOCAL;
214                                 break;
215
216                         case __constant_htonl(0x00050000):
217                                 type |= IPV6_ADDR_SITELOCAL;
218                                 break;
219                 };
220                 return type;
221         }
222
223         type = IPV6_ADDR_UNICAST;
224
225         /* Consider all addresses with the first three bits different of
226            000 and 111 as finished.
227          */
228         if ((st & htonl(0xE0000000)) != htonl(0x00000000) &&
229             (st & htonl(0xE0000000)) != htonl(0xE0000000))
230                 return type;
231         
232         if ((st & htonl(0xFFC00000)) == htonl(0xFE800000))
233                 return (IPV6_ADDR_LINKLOCAL | type);
234
235         if ((st & htonl(0xFFC00000)) == htonl(0xFEC00000))
236                 return (IPV6_ADDR_SITELOCAL | type);
237
238         if ((addr->s6_addr32[0] | addr->s6_addr32[1]) == 0) {
239                 if (addr->s6_addr32[2] == 0) {
240                         if (addr->s6_addr32[3] == 0)
241                                 return IPV6_ADDR_ANY;
242
243                         if (addr->s6_addr32[3] == htonl(0x00000001))
244                                 return (IPV6_ADDR_LOOPBACK | type);
245
246                         return (IPV6_ADDR_COMPATv4 | type);
247                 }
248
249                 if (addr->s6_addr32[2] == htonl(0x0000ffff))
250                         return IPV6_ADDR_MAPPED;
251         }
252
253         st &= htonl(0xFF000000);
254         if (st == 0)
255                 return IPV6_ADDR_RESERVED;
256         st &= htonl(0xFE000000);
257         if (st == htonl(0x02000000))
258                 return IPV6_ADDR_RESERVED;      /* for NSAP */
259         if (st == htonl(0x04000000))
260                 return IPV6_ADDR_RESERVED;      /* for IPX */
261         return type;
262 }
263
264 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
265 {
266         if (del_timer(&ifp->timer))
267                 __in6_ifa_put(ifp);
268 }
269
270 enum addrconf_timer_t
271 {
272         AC_NONE,
273         AC_DAD,
274         AC_RS,
275 };
276
277 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
278                                enum addrconf_timer_t what,
279                                unsigned long when)
280 {
281         if (!del_timer(&ifp->timer))
282                 in6_ifa_hold(ifp);
283
284         switch (what) {
285         case AC_DAD:
286                 ifp->timer.function = addrconf_dad_timer;
287                 break;
288         case AC_RS:
289                 ifp->timer.function = addrconf_rs_timer;
290                 break;
291         default:;
292         }
293         ifp->timer.expires = jiffies + when;
294         add_timer(&ifp->timer);
295 }
296
297 /* Nobody refers to this device, we may destroy it. */
298
299 void in6_dev_finish_destroy(struct inet6_dev *idev)
300 {
301         struct net_device *dev = idev->dev;
302         BUG_TRAP(idev->addr_list==NULL);
303         BUG_TRAP(idev->mc_list==NULL);
304 #ifdef NET_REFCNT_DEBUG
305         printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
306 #endif
307         dev_put(dev);
308         if (!idev->dead) {
309                 printk("Freeing alive inet6 device %p\n", idev);
310                 return;
311         }
312         snmp6_free_dev(idev);
313         kfree(idev);
314 }
315
316 static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
317 {
318         struct inet6_dev *ndev;
319
320         ASSERT_RTNL();
321
322         if (dev->mtu < IPV6_MIN_MTU)
323                 return NULL;
324
325         ndev = kmalloc(sizeof(struct inet6_dev), GFP_KERNEL);
326
327         if (ndev) {
328                 memset(ndev, 0, sizeof(struct inet6_dev));
329
330                 rwlock_init(&ndev->lock);
331                 ndev->dev = dev;
332                 memcpy(&ndev->cnf, &ipv6_devconf_dflt, sizeof(ndev->cnf));
333                 ndev->cnf.mtu6 = dev->mtu;
334                 ndev->cnf.sysctl = NULL;
335                 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
336                 if (ndev->nd_parms == NULL) {
337                         kfree(ndev);
338                         return NULL;
339                 }
340                 /* We refer to the device */
341                 dev_hold(dev);
342
343                 if (snmp6_alloc_dev(ndev) < 0) {
344                         ADBG((KERN_WARNING
345                                 "%s(): cannot allocate memory for statistics; dev=%s.\n",
346                                 __FUNCTION__, dev->name));
347                         neigh_parms_release(&nd_tbl, ndev->nd_parms);
348                         ndev->dead = 1;
349                         in6_dev_finish_destroy(ndev);
350                         return NULL;
351                 }
352
353                 if (snmp6_register_dev(ndev) < 0) {
354                         ADBG((KERN_WARNING
355                                 "%s(): cannot create /proc/net/dev_snmp6/%s\n",
356                                 __FUNCTION__, dev->name));
357                         neigh_parms_release(&nd_tbl, ndev->nd_parms);
358                         ndev->dead = 1;
359                         in6_dev_finish_destroy(ndev);
360                         return NULL;
361                 }
362
363                 /* One reference from device.  We must do this before
364                  * we invoke __ipv6_regen_rndid().
365                  */
366                 in6_dev_hold(ndev);
367
368 #ifdef CONFIG_IPV6_PRIVACY
369                 get_random_bytes(ndev->rndid, sizeof(ndev->rndid));
370                 get_random_bytes(ndev->entropy, sizeof(ndev->entropy));
371                 init_timer(&ndev->regen_timer);
372                 ndev->regen_timer.function = ipv6_regen_rndid;
373                 ndev->regen_timer.data = (unsigned long) ndev;
374                 if ((dev->flags&IFF_LOOPBACK) ||
375                     dev->type == ARPHRD_TUNNEL ||
376                     dev->type == ARPHRD_NONE ||
377                     dev->type == ARPHRD_SIT) {
378                         printk(KERN_INFO
379                                 "Disabled Privacy Extensions on device %p(%s)\n",
380                                 dev, dev->name);
381                         ndev->cnf.use_tempaddr = -1;
382                 } else {
383                         in6_dev_hold(ndev);
384                         ipv6_regen_rndid((unsigned long) ndev);
385                 }
386 #endif
387
388                 write_lock_bh(&addrconf_lock);
389                 dev->ip6_ptr = ndev;
390                 write_unlock_bh(&addrconf_lock);
391
392                 ipv6_mc_init_dev(ndev);
393                 ndev->tstamp = jiffies;
394 #ifdef CONFIG_SYSCTL
395                 neigh_sysctl_register(dev, ndev->nd_parms, NET_IPV6, 
396                                       NET_IPV6_NEIGH, "ipv6",
397                                       &ndisc_ifinfo_sysctl_change,
398                                       NULL);
399                 addrconf_sysctl_register(ndev, &ndev->cnf);
400 #endif
401         }
402         return ndev;
403 }
404
405 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
406 {
407         struct inet6_dev *idev;
408
409         ASSERT_RTNL();
410
411         if ((idev = __in6_dev_get(dev)) == NULL) {
412                 if ((idev = ipv6_add_dev(dev)) == NULL)
413                         return NULL;
414         }
415         if (dev->flags&IFF_UP)
416                 ipv6_mc_up(idev);
417         return idev;
418 }
419
420 #ifdef CONFIG_SYSCTL
421 static void dev_forward_change(struct inet6_dev *idev)
422 {
423         struct net_device *dev;
424         struct inet6_ifaddr *ifa;
425         struct in6_addr addr;
426
427         if (!idev)
428                 return;
429         dev = idev->dev;
430         if (dev && (dev->flags & IFF_MULTICAST)) {
431                 ipv6_addr_all_routers(&addr);
432         
433                 if (idev->cnf.forwarding)
434                         ipv6_dev_mc_inc(dev, &addr);
435                 else
436                         ipv6_dev_mc_dec(dev, &addr);
437         }
438         for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
439                 if (idev->cnf.forwarding)
440                         addrconf_join_anycast(ifa);
441                 else
442                         addrconf_leave_anycast(ifa);
443         }
444 }
445
446
447 static void addrconf_forward_change(void)
448 {
449         struct net_device *dev;
450         struct inet6_dev *idev;
451
452         read_lock(&dev_base_lock);
453         for (dev=dev_base; dev; dev=dev->next) {
454                 read_lock(&addrconf_lock);
455                 idev = __in6_dev_get(dev);
456                 if (idev) {
457                         int changed = (!idev->cnf.forwarding) ^ (!ipv6_devconf.forwarding);
458                         idev->cnf.forwarding = ipv6_devconf.forwarding;
459                         if (changed)
460                                 dev_forward_change(idev);
461                 }
462                 read_unlock(&addrconf_lock);
463         }
464         read_unlock(&dev_base_lock);
465 }
466 #endif
467
468 /* Nobody refers to this ifaddr, destroy it */
469
470 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
471 {
472         BUG_TRAP(ifp->if_next==NULL);
473         BUG_TRAP(ifp->lst_next==NULL);
474 #ifdef NET_REFCNT_DEBUG
475         printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
476 #endif
477
478         in6_dev_put(ifp->idev);
479
480         if (del_timer(&ifp->timer))
481                 printk("Timer is still running, when freeing ifa=%p\n", ifp);
482
483         if (!ifp->dead) {
484                 printk("Freeing alive inet6 address %p\n", ifp);
485                 return;
486         }
487         dst_release(&ifp->rt->u.dst);
488
489         kfree(ifp);
490 }
491
492 /* On success it returns ifp with increased reference count */
493
494 static struct inet6_ifaddr *
495 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
496               int scope, u32 flags)
497 {
498         struct inet6_ifaddr *ifa = NULL;
499         struct rt6_info *rt;
500         int hash;
501         int err = 0;
502
503         read_lock_bh(&addrconf_lock);
504         if (idev->dead) {
505                 err = -ENODEV;                  /*XXX*/
506                 goto out2;
507         }
508
509         write_lock(&addrconf_hash_lock);
510
511         /* Ignore adding duplicate addresses on an interface */
512         if (ipv6_chk_same_addr(addr, idev->dev)) {
513                 ADBG(("ipv6_add_addr: already assigned\n"));
514                 err = -EEXIST;
515                 goto out;
516         }
517
518         ifa = kmalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
519
520         if (ifa == NULL) {
521                 ADBG(("ipv6_add_addr: malloc failed\n"));
522                 err = -ENOBUFS;
523                 goto out;
524         }
525
526         rt = addrconf_dst_alloc(idev, addr, 0);
527         if (IS_ERR(rt)) {
528                 err = PTR_ERR(rt);
529                 goto out;
530         }
531
532         memset(ifa, 0, sizeof(struct inet6_ifaddr));
533         ipv6_addr_copy(&ifa->addr, addr);
534
535         spin_lock_init(&ifa->lock);
536         init_timer(&ifa->timer);
537         ifa->timer.data = (unsigned long) ifa;
538         ifa->scope = scope;
539         ifa->prefix_len = pfxlen;
540         ifa->flags = flags | IFA_F_TENTATIVE;
541         ifa->cstamp = ifa->tstamp = jiffies;
542
543         ifa->idev = idev;
544         in6_dev_hold(idev);
545         /* For caller */
546         in6_ifa_hold(ifa);
547
548         /* Add to big hash table */
549         hash = ipv6_addr_hash(addr);
550
551         ifa->lst_next = inet6_addr_lst[hash];
552         inet6_addr_lst[hash] = ifa;
553         in6_ifa_hold(ifa);
554         write_unlock(&addrconf_hash_lock);
555
556         write_lock(&idev->lock);
557         /* Add to inet6_dev unicast addr list. */
558         ifa->if_next = idev->addr_list;
559         idev->addr_list = ifa;
560
561 #ifdef CONFIG_IPV6_PRIVACY
562         if (ifa->flags&IFA_F_TEMPORARY) {
563                 ifa->tmp_next = idev->tempaddr_list;
564                 idev->tempaddr_list = ifa;
565                 in6_ifa_hold(ifa);
566         }
567 #endif
568
569         ifa->rt = rt;
570
571         in6_ifa_hold(ifa);
572         write_unlock(&idev->lock);
573 out2:
574         read_unlock_bh(&addrconf_lock);
575
576         if (likely(err == 0))
577                 notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
578         else {
579                 kfree(ifa);
580                 ifa = ERR_PTR(err);
581         }
582
583         return ifa;
584 out:
585         write_unlock(&addrconf_hash_lock);
586         goto out2;
587 }
588
589 /* This function wants to get referenced ifp and releases it before return */
590
591 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
592 {
593         struct inet6_ifaddr *ifa, **ifap;
594         struct inet6_dev *idev = ifp->idev;
595         int hash;
596         int deleted = 0, onlink = 0;
597         unsigned long expires = jiffies;
598
599         hash = ipv6_addr_hash(&ifp->addr);
600
601         ifp->dead = 1;
602
603         write_lock_bh(&addrconf_hash_lock);
604         for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
605              ifap = &ifa->lst_next) {
606                 if (ifa == ifp) {
607                         *ifap = ifa->lst_next;
608                         __in6_ifa_put(ifp);
609                         ifa->lst_next = NULL;
610                         break;
611                 }
612         }
613         write_unlock_bh(&addrconf_hash_lock);
614
615         write_lock_bh(&idev->lock);
616 #ifdef CONFIG_IPV6_PRIVACY
617         if (ifp->flags&IFA_F_TEMPORARY) {
618                 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
619                      ifap = &ifa->tmp_next) {
620                         if (ifa == ifp) {
621                                 *ifap = ifa->tmp_next;
622                                 if (ifp->ifpub) {
623                                         in6_ifa_put(ifp->ifpub);
624                                         ifp->ifpub = NULL;
625                                 }
626                                 __in6_ifa_put(ifp);
627                                 ifa->tmp_next = NULL;
628                                 break;
629                         }
630                 }
631         }
632 #endif
633
634         for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;
635              ifap = &ifa->if_next) {
636                 if (ifa == ifp) {
637                         *ifap = ifa->if_next;
638                         __in6_ifa_put(ifp);
639                         ifa->if_next = NULL;
640                         if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
641                                 break;
642                         deleted = 1;
643                 } else if (ifp->flags & IFA_F_PERMANENT) {
644                         if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
645                                               ifp->prefix_len)) {
646                                 if (ifa->flags & IFA_F_PERMANENT) {
647                                         onlink = 1;
648                                         if (deleted)
649                                                 break;
650                                 } else {
651                                         unsigned long lifetime;
652
653                                         if (!onlink)
654                                                 onlink = -1;
655
656                                         spin_lock(&ifa->lock);
657                                         lifetime = min_t(unsigned long,
658                                                          ifa->valid_lft, 0x7fffffffUL/HZ);
659                                         if (time_before(expires,
660                                                         ifa->tstamp + lifetime * HZ))
661                                                 expires = ifa->tstamp + lifetime * HZ;
662                                         spin_unlock(&ifa->lock);
663                                 }
664                         }
665                 }
666         }
667         write_unlock_bh(&idev->lock);
668
669         ipv6_ifa_notify(RTM_DELADDR, ifp);
670
671         notifier_call_chain(&inet6addr_chain,NETDEV_DOWN,ifp);
672
673         addrconf_del_timer(ifp);
674
675         /*
676          * Purge or update corresponding prefix
677          *
678          * 1) we don't purge prefix here if address was not permanent.
679          *    prefix is managed by its own lifetime.
680          * 2) if there're no addresses, delete prefix.
681          * 3) if there're still other permanent address(es),
682          *    corresponding prefix is still permanent.
683          * 4) otherwise, update prefix lifetime to the
684          *    longest valid lifetime among the corresponding
685          *    addresses on the device.
686          *    Note: subsequent RA will update lifetime.
687          *
688          * --yoshfuji
689          */
690         if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
691                 struct in6_addr prefix;
692                 struct rt6_info *rt;
693
694                 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
695                 rt = rt6_lookup(&prefix, NULL, ifp->idev->dev->ifindex, 1);
696
697                 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
698                         if (onlink == 0) {
699                                 ip6_del_rt(rt, NULL, NULL, NULL);
700                                 rt = NULL;
701                         } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
702                                 rt->rt6i_expires = expires;
703                                 rt->rt6i_flags |= RTF_EXPIRES;
704                         }
705                 }
706                 dst_release(&rt->u.dst);
707         }
708
709         in6_ifa_put(ifp);
710 }
711
712 #ifdef CONFIG_IPV6_PRIVACY
713 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
714 {
715         struct inet6_dev *idev = ifp->idev;
716         struct in6_addr addr, *tmpaddr;
717         unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
718         int tmp_plen;
719         int ret = 0;
720         int max_addresses;
721
722         write_lock(&idev->lock);
723         if (ift) {
724                 spin_lock_bh(&ift->lock);
725                 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
726                 spin_unlock_bh(&ift->lock);
727                 tmpaddr = &addr;
728         } else {
729                 tmpaddr = NULL;
730         }
731 retry:
732         in6_dev_hold(idev);
733         if (idev->cnf.use_tempaddr <= 0) {
734                 write_unlock(&idev->lock);
735                 printk(KERN_INFO
736                         "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
737                 in6_dev_put(idev);
738                 ret = -1;
739                 goto out;
740         }
741         spin_lock_bh(&ifp->lock);
742         if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
743                 idev->cnf.use_tempaddr = -1;    /*XXX*/
744                 spin_unlock_bh(&ifp->lock);
745                 write_unlock(&idev->lock);
746                 printk(KERN_WARNING
747                         "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
748                 in6_dev_put(idev);
749                 ret = -1;
750                 goto out;
751         }
752         in6_ifa_hold(ifp);
753         memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
754         if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
755                 spin_unlock_bh(&ifp->lock);
756                 write_unlock(&idev->lock);
757                 printk(KERN_WARNING
758                         "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
759                 in6_ifa_put(ifp);
760                 in6_dev_put(idev);
761                 ret = -1;
762                 goto out;
763         }
764         memcpy(&addr.s6_addr[8], idev->rndid, 8);
765         tmp_valid_lft = min_t(__u32,
766                               ifp->valid_lft,
767                               idev->cnf.temp_valid_lft);
768         tmp_prefered_lft = min_t(__u32, 
769                                  ifp->prefered_lft, 
770                                  idev->cnf.temp_prefered_lft - desync_factor / HZ);
771         tmp_plen = ifp->prefix_len;
772         max_addresses = idev->cnf.max_addresses;
773         tmp_cstamp = ifp->cstamp;
774         tmp_tstamp = ifp->tstamp;
775         spin_unlock_bh(&ifp->lock);
776
777         write_unlock(&idev->lock);
778         ift = !max_addresses ||
779               ipv6_count_addresses(idev) < max_addresses ? 
780                 ipv6_add_addr(idev, &addr, tmp_plen,
781                               ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK, IFA_F_TEMPORARY) : NULL;
782         if (!ift || IS_ERR(ift)) {
783                 in6_ifa_put(ifp);
784                 in6_dev_put(idev);
785                 printk(KERN_INFO
786                         "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
787                 tmpaddr = &addr;
788                 write_lock(&idev->lock);
789                 goto retry;
790         }
791
792         spin_lock_bh(&ift->lock);
793         ift->ifpub = ifp;
794         ift->valid_lft = tmp_valid_lft;
795         ift->prefered_lft = tmp_prefered_lft;
796         ift->cstamp = tmp_cstamp;
797         ift->tstamp = tmp_tstamp;
798         spin_unlock_bh(&ift->lock);
799
800         addrconf_dad_start(ift, 0);
801         in6_ifa_put(ift);
802         in6_dev_put(idev);
803 out:
804         return ret;
805 }
806 #endif
807
808 /*
809  *      Choose an appropriate source address
810  *      should do:
811  *      i)      get an address with an appropriate scope
812  *      ii)     see if there is a specific route for the destination and use
813  *              an address of the attached interface 
814  *      iii)    don't use deprecated addresses
815  */
816 static int inline ipv6_saddr_pref(const struct inet6_ifaddr *ifp, u8 invpref)
817 {
818         int pref;
819         pref = ifp->flags&IFA_F_DEPRECATED ? 0 : 2;
820 #ifdef CONFIG_IPV6_PRIVACY
821         pref |= (ifp->flags^invpref)&IFA_F_TEMPORARY ? 0 : 1;
822 #endif
823         return pref;
824 }
825
826 #ifdef CONFIG_IPV6_PRIVACY
827 #define IPV6_GET_SADDR_MAXSCORE(score)  ((score) == 3)
828 #else
829 #define IPV6_GET_SADDR_MAXSCORE(score)  (score)
830 #endif
831
832 int ipv6_dev_get_saddr(struct net_device *dev,
833                        struct in6_addr *daddr, struct in6_addr *saddr)
834 {
835         struct inet6_ifaddr *ifp = NULL;
836         struct inet6_ifaddr *match = NULL;
837         struct inet6_dev *idev;
838         int scope;
839         int err;
840         int hiscore = -1, score;
841
842         scope = ipv6_addr_scope(daddr);
843
844         /*
845          *      known dev
846          *      search dev and walk through dev addresses
847          */
848
849         if (dev) {
850                 if (dev->flags & IFF_LOOPBACK)
851                         scope = IFA_HOST;
852
853                 read_lock(&addrconf_lock);
854                 idev = __in6_dev_get(dev);
855                 if (idev) {
856                         read_lock_bh(&idev->lock);
857                         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
858                                 if (ifp->scope == scope) {
859                                         if (ifp->flags&IFA_F_TENTATIVE)
860                                                 continue;
861 #ifdef CONFIG_IPV6_PRIVACY
862                                         score = ipv6_saddr_pref(ifp, idev->cnf.use_tempaddr > 1 ? IFA_F_TEMPORARY : 0);
863 #else
864                                         score = ipv6_saddr_pref(ifp, 0);
865 #endif
866                                         if (score <= hiscore)
867                                                 continue;
868
869                                         if (match)
870                                                 in6_ifa_put(match);
871                                         match = ifp;
872                                         hiscore = score;
873                                         in6_ifa_hold(ifp);
874
875                                         if (IPV6_GET_SADDR_MAXSCORE(score)) {
876                                                 read_unlock_bh(&idev->lock);
877                                                 read_unlock(&addrconf_lock);
878                                                 goto out;
879                                         }
880                                 }
881                         }
882                         read_unlock_bh(&idev->lock);
883                 }
884                 read_unlock(&addrconf_lock);
885         }
886
887         if (scope == IFA_LINK)
888                 goto out;
889
890         /*
891          *      dev == NULL or search failed for specified dev
892          */
893
894         read_lock(&dev_base_lock);
895         read_lock(&addrconf_lock);
896         for (dev = dev_base; dev; dev=dev->next) {
897                 idev = __in6_dev_get(dev);
898                 if (idev) {
899                         read_lock_bh(&idev->lock);
900                         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
901                                 if (ifp->scope == scope) {
902                                         if (ifp->flags&IFA_F_TENTATIVE)
903                                                 continue;
904 #ifdef CONFIG_IPV6_PRIVACY
905                                         score = ipv6_saddr_pref(ifp, idev->cnf.use_tempaddr > 1 ? IFA_F_TEMPORARY : 0);
906 #else
907                                         score = ipv6_saddr_pref(ifp, 0);
908 #endif
909                                         if (score <= hiscore)
910                                                 continue;
911
912                                         if (match)
913                                                 in6_ifa_put(match);
914                                         match = ifp;
915                                         hiscore = score;
916                                         in6_ifa_hold(ifp);
917
918                                         if (IPV6_GET_SADDR_MAXSCORE(score)) {
919                                                 read_unlock_bh(&idev->lock);
920                                                 goto out_unlock_base;
921                                         }
922                                 }
923                         }
924                         read_unlock_bh(&idev->lock);
925                 }
926         }
927
928 out_unlock_base:
929         read_unlock(&addrconf_lock);
930         read_unlock(&dev_base_lock);
931
932 out:
933         err = -EADDRNOTAVAIL;
934         if (match) {
935                 ipv6_addr_copy(saddr, &match->addr);
936                 err = 0;
937                 in6_ifa_put(match);
938         }
939
940         return err;
941 }
942
943
944 int ipv6_get_saddr(struct dst_entry *dst,
945                    struct in6_addr *daddr, struct in6_addr *saddr)
946 {
947         return ipv6_dev_get_saddr(dst ? ((struct rt6_info *)dst)->rt6i_idev->dev : NULL, daddr, saddr);
948 }
949
950
951 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr)
952 {
953         struct inet6_dev *idev;
954         int err = -EADDRNOTAVAIL;
955
956         read_lock(&addrconf_lock);
957         if ((idev = __in6_dev_get(dev)) != NULL) {
958                 struct inet6_ifaddr *ifp;
959
960                 read_lock_bh(&idev->lock);
961                 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
962                         if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
963                                 ipv6_addr_copy(addr, &ifp->addr);
964                                 err = 0;
965                                 break;
966                         }
967                 }
968                 read_unlock_bh(&idev->lock);
969         }
970         read_unlock(&addrconf_lock);
971         return err;
972 }
973
974 static int ipv6_count_addresses(struct inet6_dev *idev)
975 {
976         int cnt = 0;
977         struct inet6_ifaddr *ifp;
978
979         read_lock_bh(&idev->lock);
980         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
981                 cnt++;
982         read_unlock_bh(&idev->lock);
983         return cnt;
984 }
985
986 int ipv6_chk_addr(struct in6_addr *addr, struct net_device *dev, int strict)
987 {
988         struct inet6_ifaddr * ifp;
989         u8 hash = ipv6_addr_hash(addr);
990
991         read_lock_bh(&addrconf_hash_lock);
992         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
993                 if (ipv6_addr_equal(&ifp->addr, addr) &&
994                     !(ifp->flags&IFA_F_TENTATIVE)) {
995                         if (dev == NULL || ifp->idev->dev == dev ||
996                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
997                                 break;
998                 }
999         }
1000         read_unlock_bh(&addrconf_hash_lock);
1001         return ifp != NULL;
1002 }
1003
1004 static
1005 int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev)
1006 {
1007         struct inet6_ifaddr * ifp;
1008         u8 hash = ipv6_addr_hash(addr);
1009
1010         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1011                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1012                         if (dev == NULL || ifp->idev->dev == dev)
1013                                 break;
1014                 }
1015         }
1016         return ifp != NULL;
1017 }
1018
1019 struct inet6_ifaddr * ipv6_get_ifaddr(struct in6_addr *addr, struct net_device *dev, int strict)
1020 {
1021         struct inet6_ifaddr * ifp;
1022         u8 hash = ipv6_addr_hash(addr);
1023
1024         read_lock_bh(&addrconf_hash_lock);
1025         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1026                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1027                         if (dev == NULL || ifp->idev->dev == dev ||
1028                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1029                                 in6_ifa_hold(ifp);
1030                                 break;
1031                         }
1032                 }
1033         }
1034         read_unlock_bh(&addrconf_hash_lock);
1035
1036         return ifp;
1037 }
1038
1039 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1040 {
1041         const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
1042         const struct in6_addr *sk2_rcv_saddr6 = tcp_v6_rcv_saddr(sk2);
1043         u32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
1044         u32 sk2_rcv_saddr = tcp_v4_rcv_saddr(sk2);
1045         int sk_ipv6only = ipv6_only_sock(sk);
1046         int sk2_ipv6only = tcp_v6_ipv6only(sk2);
1047         int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1048         int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1049
1050         if (!sk2_rcv_saddr && !sk_ipv6only)
1051                 return 1;
1052
1053         if (addr_type2 == IPV6_ADDR_ANY &&
1054             !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1055                 return 1;
1056
1057         if (addr_type == IPV6_ADDR_ANY &&
1058             !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1059                 return 1;
1060
1061         if (sk2_rcv_saddr6 &&
1062             ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1063                 return 1;
1064
1065         if (addr_type == IPV6_ADDR_MAPPED &&
1066             !sk2_ipv6only &&
1067             (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1068                 return 1;
1069
1070         return 0;
1071 }
1072
1073 /* Gets referenced address, destroys ifaddr */
1074
1075 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1076 {
1077         if (net_ratelimit())
1078                 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1079         if (ifp->flags&IFA_F_PERMANENT) {
1080                 spin_lock_bh(&ifp->lock);
1081                 addrconf_del_timer(ifp);
1082                 ifp->flags |= IFA_F_TENTATIVE;
1083                 spin_unlock_bh(&ifp->lock);
1084                 in6_ifa_put(ifp);
1085 #ifdef CONFIG_IPV6_PRIVACY
1086         } else if (ifp->flags&IFA_F_TEMPORARY) {
1087                 struct inet6_ifaddr *ifpub;
1088                 spin_lock_bh(&ifp->lock);
1089                 ifpub = ifp->ifpub;
1090                 if (ifpub) {
1091                         in6_ifa_hold(ifpub);
1092                         spin_unlock_bh(&ifp->lock);
1093                         ipv6_create_tempaddr(ifpub, ifp);
1094                         in6_ifa_put(ifpub);
1095                 } else {
1096                         spin_unlock_bh(&ifp->lock);
1097                 }
1098                 ipv6_del_addr(ifp);
1099 #endif
1100         } else
1101                 ipv6_del_addr(ifp);
1102 }
1103
1104
1105 /* Join to solicited addr multicast group. */
1106
1107 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1108 {
1109         struct in6_addr maddr;
1110
1111         if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1112                 return;
1113
1114         addrconf_addr_solict_mult(addr, &maddr);
1115         ipv6_dev_mc_inc(dev, &maddr);
1116 }
1117
1118 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1119 {
1120         struct in6_addr maddr;
1121
1122         if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1123                 return;
1124
1125         addrconf_addr_solict_mult(addr, &maddr);
1126         __ipv6_dev_mc_dec(idev, &maddr);
1127 }
1128
1129 void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1130 {
1131         struct in6_addr addr;
1132         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1133         if (ipv6_addr_any(&addr))
1134                 return;
1135         ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1136 }
1137
1138 void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1139 {
1140         struct in6_addr addr;
1141         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1142         if (ipv6_addr_any(&addr))
1143                 return;
1144         __ipv6_dev_ac_dec(ifp->idev, &addr);
1145 }
1146
1147 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1148 {
1149         switch (dev->type) {
1150         case ARPHRD_ETHER:
1151         case ARPHRD_FDDI:
1152         case ARPHRD_IEEE802_TR:
1153                 if (dev->addr_len != ETH_ALEN)
1154                         return -1;
1155                 memcpy(eui, dev->dev_addr, 3);
1156                 memcpy(eui + 5, dev->dev_addr + 3, 3);
1157
1158                 /*
1159                  * The zSeries OSA network cards can be shared among various
1160                  * OS instances, but the OSA cards have only one MAC address.
1161                  * This leads to duplicate address conflicts in conjunction
1162                  * with IPv6 if more than one instance uses the same card.
1163                  * 
1164                  * The driver for these cards can deliver a unique 16-bit
1165                  * identifier for each instance sharing the same card.  It is
1166                  * placed instead of 0xFFFE in the interface identifier.  The
1167                  * "u" bit of the interface identifier is not inverted in this
1168                  * case.  Hence the resulting interface identifier has local
1169                  * scope according to RFC2373.
1170                  */
1171                 if (dev->dev_id) {
1172                         eui[3] = (dev->dev_id >> 8) & 0xFF;
1173                         eui[4] = dev->dev_id & 0xFF;
1174                 } else {
1175                         eui[3] = 0xFF;
1176                         eui[4] = 0xFE;
1177                         eui[0] ^= 2;
1178                 }
1179                 return 0;
1180         case ARPHRD_ARCNET:
1181                 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1182                 if (dev->addr_len != ARCNET_ALEN)
1183                         return -1;
1184                 memset(eui, 0, 7);
1185                 eui[7] = *(u8*)dev->dev_addr;
1186                 return 0;
1187         case ARPHRD_INFINIBAND:
1188                 if (dev->addr_len != INFINIBAND_ALEN)
1189                         return -1;
1190                 memcpy(eui, dev->dev_addr + 12, 8);
1191                 eui[0] |= 2;
1192                 return 0;
1193         }
1194         return -1;
1195 }
1196
1197 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1198 {
1199         int err = -1;
1200         struct inet6_ifaddr *ifp;
1201
1202         read_lock_bh(&idev->lock);
1203         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1204                 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1205                         memcpy(eui, ifp->addr.s6_addr+8, 8);
1206                         err = 0;
1207                         break;
1208                 }
1209         }
1210         read_unlock_bh(&idev->lock);
1211         return err;
1212 }
1213
1214 #ifdef CONFIG_IPV6_PRIVACY
1215 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1216 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1217 {
1218         struct net_device *dev;
1219         struct scatterlist sg[2];
1220
1221         sg[0].page = virt_to_page(idev->entropy);
1222         sg[0].offset = offset_in_page(idev->entropy);
1223         sg[0].length = 8;
1224         sg[1].page = virt_to_page(idev->work_eui64);
1225         sg[1].offset = offset_in_page(idev->work_eui64);
1226         sg[1].length = 8;
1227
1228         dev = idev->dev;
1229
1230         if (ipv6_generate_eui64(idev->work_eui64, dev)) {
1231                 printk(KERN_INFO
1232                         "__ipv6_regen_rndid(idev=%p): cannot get EUI64 identifier; use random bytes.\n",
1233                         idev);
1234                 get_random_bytes(idev->work_eui64, sizeof(idev->work_eui64));
1235         }
1236 regen:
1237         spin_lock(&md5_tfm_lock);
1238         if (unlikely(md5_tfm == NULL)) {
1239                 spin_unlock(&md5_tfm_lock);
1240                 return -1;
1241         }
1242         crypto_digest_init(md5_tfm);
1243         crypto_digest_update(md5_tfm, sg, 2);
1244         crypto_digest_final(md5_tfm, idev->work_digest);
1245         spin_unlock(&md5_tfm_lock);
1246
1247         memcpy(idev->rndid, &idev->work_digest[0], 8);
1248         idev->rndid[0] &= ~0x02;
1249         memcpy(idev->entropy, &idev->work_digest[8], 8);
1250
1251         /*
1252          * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1253          * check if generated address is not inappropriate
1254          *
1255          *  - Reserved subnet anycast (RFC 2526)
1256          *      11111101 11....11 1xxxxxxx
1257          *  - ISATAP (draft-ietf-ngtrans-isatap-13.txt) 5.1
1258          *      00-00-5E-FE-xx-xx-xx-xx
1259          *  - value 0
1260          *  - XXX: already assigned to an address on the device
1261          */
1262         if (idev->rndid[0] == 0xfd && 
1263             (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1264             (idev->rndid[7]&0x80))
1265                 goto regen;
1266         if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1267                 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1268                         goto regen;
1269                 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1270                         goto regen;
1271         }
1272
1273         return 0;
1274 }
1275
1276 static void ipv6_regen_rndid(unsigned long data)
1277 {
1278         struct inet6_dev *idev = (struct inet6_dev *) data;
1279         unsigned long expires;
1280
1281         read_lock_bh(&addrconf_lock);
1282         write_lock_bh(&idev->lock);
1283
1284         if (idev->dead)
1285                 goto out;
1286
1287         if (__ipv6_regen_rndid(idev) < 0)
1288                 goto out;
1289         
1290         expires = jiffies +
1291                 idev->cnf.temp_prefered_lft * HZ - 
1292                 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1293         if (time_before(expires, jiffies)) {
1294                 printk(KERN_WARNING
1295                         "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1296                         idev->dev->name);
1297                 goto out;
1298         }
1299
1300         if (!mod_timer(&idev->regen_timer, expires))
1301                 in6_dev_hold(idev);
1302
1303 out:
1304         write_unlock_bh(&idev->lock);
1305         read_unlock_bh(&addrconf_lock);
1306         in6_dev_put(idev);
1307 }
1308
1309 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1310         int ret = 0;
1311
1312         if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1313                 ret = __ipv6_regen_rndid(idev);
1314         return ret;
1315 }
1316 #endif
1317
1318 /*
1319  *      Add prefix route.
1320  */
1321
1322 static void
1323 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1324                       unsigned long expires, u32 flags)
1325 {
1326         struct in6_rtmsg rtmsg;
1327
1328         memset(&rtmsg, 0, sizeof(rtmsg));
1329         ipv6_addr_copy(&rtmsg.rtmsg_dst, pfx);
1330         rtmsg.rtmsg_dst_len = plen;
1331         rtmsg.rtmsg_metric = IP6_RT_PRIO_ADDRCONF;
1332         rtmsg.rtmsg_ifindex = dev->ifindex;
1333         rtmsg.rtmsg_info = expires;
1334         rtmsg.rtmsg_flags = RTF_UP|flags;
1335         rtmsg.rtmsg_type = RTMSG_NEWROUTE;
1336
1337         /* Prevent useless cloning on PtP SIT.
1338            This thing is done here expecting that the whole
1339            class of non-broadcast devices need not cloning.
1340          */
1341         if (dev->type == ARPHRD_SIT && (dev->flags&IFF_POINTOPOINT))
1342                 rtmsg.rtmsg_flags |= RTF_NONEXTHOP;
1343
1344         ip6_route_add(&rtmsg, NULL, NULL, NULL);
1345 }
1346
1347 /* Create "default" multicast route to the interface */
1348
1349 static void addrconf_add_mroute(struct net_device *dev)
1350 {
1351         struct in6_rtmsg rtmsg;
1352
1353         memset(&rtmsg, 0, sizeof(rtmsg));
1354         ipv6_addr_set(&rtmsg.rtmsg_dst,
1355                       htonl(0xFF000000), 0, 0, 0);
1356         rtmsg.rtmsg_dst_len = 8;
1357         rtmsg.rtmsg_metric = IP6_RT_PRIO_ADDRCONF;
1358         rtmsg.rtmsg_ifindex = dev->ifindex;
1359         rtmsg.rtmsg_flags = RTF_UP;
1360         rtmsg.rtmsg_type = RTMSG_NEWROUTE;
1361         ip6_route_add(&rtmsg, NULL, NULL, NULL);
1362 }
1363
1364 static void sit_route_add(struct net_device *dev)
1365 {
1366         struct in6_rtmsg rtmsg;
1367
1368         memset(&rtmsg, 0, sizeof(rtmsg));
1369
1370         rtmsg.rtmsg_type        = RTMSG_NEWROUTE;
1371         rtmsg.rtmsg_metric      = IP6_RT_PRIO_ADDRCONF;
1372
1373         /* prefix length - 96 bits "::d.d.d.d" */
1374         rtmsg.rtmsg_dst_len     = 96;
1375         rtmsg.rtmsg_flags       = RTF_UP|RTF_NONEXTHOP;
1376         rtmsg.rtmsg_ifindex     = dev->ifindex;
1377
1378         ip6_route_add(&rtmsg, NULL, NULL, NULL);
1379 }
1380
1381 static void addrconf_add_lroute(struct net_device *dev)
1382 {
1383         struct in6_addr addr;
1384
1385         ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
1386         addrconf_prefix_route(&addr, 64, dev, 0, 0);
1387 }
1388
1389 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1390 {
1391         struct inet6_dev *idev;
1392
1393         ASSERT_RTNL();
1394
1395         if ((idev = ipv6_find_idev(dev)) == NULL)
1396                 return NULL;
1397
1398         /* Add default multicast route */
1399         addrconf_add_mroute(dev);
1400
1401         /* Add link local route */
1402         addrconf_add_lroute(dev);
1403         return idev;
1404 }
1405
1406 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1407 {
1408         struct prefix_info *pinfo;
1409         __u32 valid_lft;
1410         __u32 prefered_lft;
1411         int addr_type;
1412         unsigned long rt_expires;
1413         struct inet6_dev *in6_dev;
1414
1415         pinfo = (struct prefix_info *) opt;
1416         
1417         if (len < sizeof(struct prefix_info)) {
1418                 ADBG(("addrconf: prefix option too short\n"));
1419                 return;
1420         }
1421         
1422         /*
1423          *      Validation checks ([ADDRCONF], page 19)
1424          */
1425
1426         addr_type = ipv6_addr_type(&pinfo->prefix);
1427
1428         if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1429                 return;
1430
1431         valid_lft = ntohl(pinfo->valid);
1432         prefered_lft = ntohl(pinfo->prefered);
1433
1434         if (prefered_lft > valid_lft) {
1435                 if (net_ratelimit())
1436                         printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1437                 return;
1438         }
1439
1440         in6_dev = in6_dev_get(dev);
1441
1442         if (in6_dev == NULL) {
1443                 if (net_ratelimit())
1444                         printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1445                 return;
1446         }
1447
1448         /*
1449          *      Two things going on here:
1450          *      1) Add routes for on-link prefixes
1451          *      2) Configure prefixes with the auto flag set
1452          */
1453
1454         /* Avoid arithmetic overflow. Really, we could
1455            save rt_expires in seconds, likely valid_lft,
1456            but it would require division in fib gc, that it
1457            not good.
1458          */
1459         if (valid_lft >= 0x7FFFFFFF/HZ)
1460                 rt_expires = 0;
1461         else
1462                 rt_expires = jiffies + valid_lft * HZ;
1463
1464         if (pinfo->onlink) {
1465                 struct rt6_info *rt;
1466                 rt = rt6_lookup(&pinfo->prefix, NULL, dev->ifindex, 1);
1467
1468                 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
1469                         if (rt->rt6i_flags&RTF_EXPIRES) {
1470                                 if (valid_lft == 0) {
1471                                         ip6_del_rt(rt, NULL, NULL, NULL);
1472                                         rt = NULL;
1473                                 } else {
1474                                         rt->rt6i_expires = rt_expires;
1475                                 }
1476                         }
1477                 } else if (valid_lft) {
1478                         addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1479                                               dev, rt_expires, RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT);
1480                 }
1481                 if (rt)
1482                         dst_release(&rt->u.dst);
1483         }
1484
1485         /* Try to figure out our local address for this prefix */
1486
1487         if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1488                 struct inet6_ifaddr * ifp;
1489                 struct in6_addr addr;
1490                 int create = 0, update_lft = 0;
1491
1492                 if (pinfo->prefix_len == 64) {
1493                         memcpy(&addr, &pinfo->prefix, 8);
1494                         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1495                             ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1496                                 in6_dev_put(in6_dev);
1497                                 return;
1498                         }
1499                         goto ok;
1500                 }
1501                 if (net_ratelimit())
1502                         printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1503                                pinfo->prefix_len);
1504                 in6_dev_put(in6_dev);
1505                 return;
1506
1507 ok:
1508
1509                 ifp = ipv6_get_ifaddr(&addr, dev, 1);
1510
1511                 if (ifp == NULL && valid_lft) {
1512                         int max_addresses = in6_dev->cnf.max_addresses;
1513
1514                         /* Do not allow to create too much of autoconfigured
1515                          * addresses; this would be too easy way to crash kernel.
1516                          */
1517                         if (!max_addresses ||
1518                             ipv6_count_addresses(in6_dev) < max_addresses)
1519                                 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1520                                                     addr_type&IPV6_ADDR_SCOPE_MASK, 0);
1521
1522                         if (!ifp || IS_ERR(ifp)) {
1523                                 in6_dev_put(in6_dev);
1524                                 return;
1525                         }
1526
1527                         update_lft = create = 1;
1528                         ifp->cstamp = jiffies;
1529                         addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1530                 }
1531
1532                 if (ifp) {
1533                         int flags;
1534                         unsigned long now;
1535 #ifdef CONFIG_IPV6_PRIVACY
1536                         struct inet6_ifaddr *ift;
1537 #endif
1538                         u32 stored_lft;
1539
1540                         /* update lifetime (RFC2462 5.5.3 e) */
1541                         spin_lock(&ifp->lock);
1542                         now = jiffies;
1543                         if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1544                                 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1545                         else
1546                                 stored_lft = 0;
1547                         if (!update_lft && stored_lft) {
1548                                 if (valid_lft > MIN_VALID_LIFETIME ||
1549                                     valid_lft > stored_lft)
1550                                         update_lft = 1;
1551                                 else if (stored_lft <= MIN_VALID_LIFETIME) {
1552                                         /* valid_lft <= stored_lft is always true */
1553                                         /* XXX: IPsec */
1554                                         update_lft = 0;
1555                                 } else {
1556                                         valid_lft = MIN_VALID_LIFETIME;
1557                                         if (valid_lft < prefered_lft)
1558                                                 prefered_lft = valid_lft;
1559                                         update_lft = 1;
1560                                 }
1561                         }
1562
1563                         if (update_lft) {
1564                                 ifp->valid_lft = valid_lft;
1565                                 ifp->prefered_lft = prefered_lft;
1566                                 ifp->tstamp = now;
1567                                 flags = ifp->flags;
1568                                 ifp->flags &= ~IFA_F_DEPRECATED;
1569                                 spin_unlock(&ifp->lock);
1570
1571                                 if (!(flags&IFA_F_TENTATIVE))
1572                                         ipv6_ifa_notify(0, ifp);
1573                         } else
1574                                 spin_unlock(&ifp->lock);
1575
1576 #ifdef CONFIG_IPV6_PRIVACY
1577                         read_lock_bh(&in6_dev->lock);
1578                         /* update all temporary addresses in the list */
1579                         for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1580                                 /*
1581                                  * When adjusting the lifetimes of an existing
1582                                  * temporary address, only lower the lifetimes.
1583                                  * Implementations must not increase the
1584                                  * lifetimes of an existing temporary address
1585                                  * when processing a Prefix Information Option.
1586                                  */
1587                                 spin_lock(&ift->lock);
1588                                 flags = ift->flags;
1589                                 if (ift->valid_lft > valid_lft &&
1590                                     ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1591                                         ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1592                                 if (ift->prefered_lft > prefered_lft &&
1593                                     ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1594                                         ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1595                                 spin_unlock(&ift->lock);
1596                                 if (!(flags&IFA_F_TENTATIVE))
1597                                         ipv6_ifa_notify(0, ift);
1598                         }
1599
1600                         if (create && in6_dev->cnf.use_tempaddr > 0) {
1601                                 /*
1602                                  * When a new public address is created as described in [ADDRCONF],
1603                                  * also create a new temporary address.
1604                                  */
1605                                 read_unlock_bh(&in6_dev->lock); 
1606                                 ipv6_create_tempaddr(ifp, NULL);
1607                         } else {
1608                                 read_unlock_bh(&in6_dev->lock);
1609                         }
1610 #endif
1611                         in6_ifa_put(ifp);
1612                         addrconf_verify(0);
1613                 }
1614         }
1615         inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
1616         in6_dev_put(in6_dev);
1617 }
1618
1619 /*
1620  *      Set destination address.
1621  *      Special case for SIT interfaces where we create a new "virtual"
1622  *      device.
1623  */
1624 int addrconf_set_dstaddr(void __user *arg)
1625 {
1626         struct in6_ifreq ireq;
1627         struct net_device *dev;
1628         int err = -EINVAL;
1629
1630         rtnl_lock();
1631
1632         err = -EFAULT;
1633         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1634                 goto err_exit;
1635
1636         dev = __dev_get_by_index(ireq.ifr6_ifindex);
1637
1638         err = -ENODEV;
1639         if (dev == NULL)
1640                 goto err_exit;
1641
1642         if (dev->type == ARPHRD_SIT) {
1643                 struct ifreq ifr;
1644                 mm_segment_t    oldfs;
1645                 struct ip_tunnel_parm p;
1646
1647                 err = -EADDRNOTAVAIL;
1648                 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
1649                         goto err_exit;
1650
1651                 memset(&p, 0, sizeof(p));
1652                 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
1653                 p.iph.saddr = 0;
1654                 p.iph.version = 4;
1655                 p.iph.ihl = 5;
1656                 p.iph.protocol = IPPROTO_IPV6;
1657                 p.iph.ttl = 64;
1658                 ifr.ifr_ifru.ifru_data = (void __user *)&p;
1659
1660                 oldfs = get_fs(); set_fs(KERNEL_DS);
1661                 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
1662                 set_fs(oldfs);
1663
1664                 if (err == 0) {
1665                         err = -ENOBUFS;
1666                         if ((dev = __dev_get_by_name(p.name)) == NULL)
1667                                 goto err_exit;
1668                         err = dev_open(dev);
1669                 }
1670         }
1671
1672 err_exit:
1673         rtnl_unlock();
1674         return err;
1675 }
1676
1677 /*
1678  *      Manual configuration of address on an interface
1679  */
1680 static int inet6_addr_add(int ifindex, struct in6_addr *pfx, int plen)
1681 {
1682         struct inet6_ifaddr *ifp;
1683         struct inet6_dev *idev;
1684         struct net_device *dev;
1685         int scope;
1686
1687         ASSERT_RTNL();
1688         
1689         if ((dev = __dev_get_by_index(ifindex)) == NULL)
1690                 return -ENODEV;
1691         
1692         if (!(dev->flags&IFF_UP))
1693                 return -ENETDOWN;
1694
1695         if ((idev = addrconf_add_dev(dev)) == NULL)
1696                 return -ENOBUFS;
1697
1698         scope = ipv6_addr_scope(pfx);
1699
1700         ifp = ipv6_add_addr(idev, pfx, plen, scope, IFA_F_PERMANENT);
1701         if (!IS_ERR(ifp)) {
1702                 addrconf_dad_start(ifp, 0);
1703                 in6_ifa_put(ifp);
1704                 return 0;
1705         }
1706
1707         return PTR_ERR(ifp);
1708 }
1709
1710 static int inet6_addr_del(int ifindex, struct in6_addr *pfx, int plen)
1711 {
1712         struct inet6_ifaddr *ifp;
1713         struct inet6_dev *idev;
1714         struct net_device *dev;
1715         
1716         if ((dev = __dev_get_by_index(ifindex)) == NULL)
1717                 return -ENODEV;
1718
1719         if ((idev = __in6_dev_get(dev)) == NULL)
1720                 return -ENXIO;
1721
1722         read_lock_bh(&idev->lock);
1723         for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
1724                 if (ifp->prefix_len == plen &&
1725                     ipv6_addr_equal(pfx, &ifp->addr)) {
1726                         in6_ifa_hold(ifp);
1727                         read_unlock_bh(&idev->lock);
1728                         
1729                         ipv6_del_addr(ifp);
1730
1731                         /* If the last address is deleted administratively,
1732                            disable IPv6 on this interface.
1733                          */
1734                         if (idev->addr_list == NULL)
1735                                 addrconf_ifdown(idev->dev, 1);
1736                         return 0;
1737                 }
1738         }
1739         read_unlock_bh(&idev->lock);
1740         return -EADDRNOTAVAIL;
1741 }
1742
1743
1744 int addrconf_add_ifaddr(void __user *arg)
1745 {
1746         struct in6_ifreq ireq;
1747         int err;
1748         
1749         if (!capable(CAP_NET_ADMIN))
1750                 return -EPERM;
1751         
1752         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1753                 return -EFAULT;
1754
1755         rtnl_lock();
1756         err = inet6_addr_add(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
1757         rtnl_unlock();
1758         return err;
1759 }
1760
1761 int addrconf_del_ifaddr(void __user *arg)
1762 {
1763         struct in6_ifreq ireq;
1764         int err;
1765         
1766         if (!capable(CAP_NET_ADMIN))
1767                 return -EPERM;
1768
1769         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1770                 return -EFAULT;
1771
1772         rtnl_lock();
1773         err = inet6_addr_del(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
1774         rtnl_unlock();
1775         return err;
1776 }
1777
1778 static void sit_add_v4_addrs(struct inet6_dev *idev)
1779 {
1780         struct inet6_ifaddr * ifp;
1781         struct in6_addr addr;
1782         struct net_device *dev;
1783         int scope;
1784
1785         ASSERT_RTNL();
1786
1787         memset(&addr, 0, sizeof(struct in6_addr));
1788         memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
1789
1790         if (idev->dev->flags&IFF_POINTOPOINT) {
1791                 addr.s6_addr32[0] = htonl(0xfe800000);
1792                 scope = IFA_LINK;
1793         } else {
1794                 scope = IPV6_ADDR_COMPATv4;
1795         }
1796
1797         if (addr.s6_addr32[3]) {
1798                 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
1799                 if (!IS_ERR(ifp)) {
1800                         spin_lock_bh(&ifp->lock);
1801                         ifp->flags &= ~IFA_F_TENTATIVE;
1802                         spin_unlock_bh(&ifp->lock);
1803                         ipv6_ifa_notify(RTM_NEWADDR, ifp);
1804                         in6_ifa_put(ifp);
1805                 }
1806                 return;
1807         }
1808
1809         for (dev = dev_base; dev != NULL; dev = dev->next) {
1810                 struct in_device * in_dev = __in_dev_get(dev);
1811                 if (in_dev && (dev->flags & IFF_UP)) {
1812                         struct in_ifaddr * ifa;
1813
1814                         int flag = scope;
1815
1816                         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1817                                 int plen;
1818
1819                                 addr.s6_addr32[3] = ifa->ifa_local;
1820
1821                                 if (ifa->ifa_scope == RT_SCOPE_LINK)
1822                                         continue;
1823                                 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
1824                                         if (idev->dev->flags&IFF_POINTOPOINT)
1825                                                 continue;
1826                                         flag |= IFA_HOST;
1827                                 }
1828                                 if (idev->dev->flags&IFF_POINTOPOINT)
1829                                         plen = 64;
1830                                 else
1831                                         plen = 96;
1832
1833                                 ifp = ipv6_add_addr(idev, &addr, plen, flag,
1834                                                     IFA_F_PERMANENT);
1835                                 if (!IS_ERR(ifp)) {
1836                                         spin_lock_bh(&ifp->lock);
1837                                         ifp->flags &= ~IFA_F_TENTATIVE;
1838                                         spin_unlock_bh(&ifp->lock);
1839                                         ipv6_ifa_notify(RTM_NEWADDR, ifp);
1840                                         in6_ifa_put(ifp);
1841                                 }
1842                         }
1843                 }
1844         }
1845 }
1846
1847 static void init_loopback(struct net_device *dev)
1848 {
1849         struct inet6_dev  *idev;
1850         struct inet6_ifaddr * ifp;
1851
1852         /* ::1 */
1853
1854         ASSERT_RTNL();
1855
1856         if ((idev = ipv6_find_idev(dev)) == NULL) {
1857                 printk(KERN_DEBUG "init loopback: add_dev failed\n");
1858                 return;
1859         }
1860
1861         ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
1862         if (!IS_ERR(ifp)) {
1863                 spin_lock_bh(&ifp->lock);
1864                 ifp->flags &= ~IFA_F_TENTATIVE;
1865                 spin_unlock_bh(&ifp->lock);
1866                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
1867                 in6_ifa_put(ifp);
1868         }
1869 }
1870
1871 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
1872 {
1873         struct inet6_ifaddr * ifp;
1874
1875         ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, IFA_F_PERMANENT);
1876         if (!IS_ERR(ifp)) {
1877                 addrconf_dad_start(ifp, 0);
1878                 in6_ifa_put(ifp);
1879         }
1880 }
1881
1882 static void addrconf_dev_config(struct net_device *dev)
1883 {
1884         struct in6_addr addr;
1885         struct inet6_dev    * idev;
1886
1887         ASSERT_RTNL();
1888
1889         if ((dev->type != ARPHRD_ETHER) && 
1890             (dev->type != ARPHRD_FDDI) &&
1891             (dev->type != ARPHRD_IEEE802_TR) &&
1892             (dev->type != ARPHRD_ARCNET) &&
1893             (dev->type != ARPHRD_INFINIBAND)) {
1894                 /* Alas, we support only Ethernet autoconfiguration. */
1895                 return;
1896         }
1897
1898         idev = addrconf_add_dev(dev);
1899         if (idev == NULL)
1900                 return;
1901
1902         memset(&addr, 0, sizeof(struct in6_addr));
1903         addr.s6_addr32[0] = htonl(0xFE800000);
1904
1905         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
1906                 addrconf_add_linklocal(idev, &addr);
1907 }
1908
1909 static void addrconf_sit_config(struct net_device *dev)
1910 {
1911         struct inet6_dev *idev;
1912
1913         ASSERT_RTNL();
1914
1915         /* 
1916          * Configure the tunnel with one of our IPv4 
1917          * addresses... we should configure all of 
1918          * our v4 addrs in the tunnel
1919          */
1920
1921         if ((idev = ipv6_find_idev(dev)) == NULL) {
1922                 printk(KERN_DEBUG "init sit: add_dev failed\n");
1923                 return;
1924         }
1925
1926         sit_add_v4_addrs(idev);
1927
1928         if (dev->flags&IFF_POINTOPOINT) {
1929                 addrconf_add_mroute(dev);
1930                 addrconf_add_lroute(dev);
1931         } else
1932                 sit_route_add(dev);
1933 }
1934
1935 static inline int
1936 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
1937 {
1938         struct in6_addr lladdr;
1939
1940         if (!ipv6_get_lladdr(link_dev, &lladdr)) {
1941                 addrconf_add_linklocal(idev, &lladdr);
1942                 return 0;
1943         }
1944         return -1;
1945 }
1946
1947 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
1948 {
1949         struct net_device *link_dev;
1950
1951         /* first try to inherit the link-local address from the link device */
1952         if (idev->dev->iflink &&
1953             (link_dev = __dev_get_by_index(idev->dev->iflink))) {
1954                 if (!ipv6_inherit_linklocal(idev, link_dev))
1955                         return;
1956         }
1957         /* then try to inherit it from any device */
1958         for (link_dev = dev_base; link_dev; link_dev = link_dev->next) {
1959                 if (!ipv6_inherit_linklocal(idev, link_dev))
1960                         return;
1961         }
1962         printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
1963 }
1964
1965 /*
1966  * Autoconfigure tunnel with a link-local address so routing protocols,
1967  * DHCPv6, MLD etc. can be run over the virtual link
1968  */
1969
1970 static void addrconf_ip6_tnl_config(struct net_device *dev)
1971 {
1972         struct inet6_dev *idev;
1973
1974         ASSERT_RTNL();
1975
1976         if ((idev = addrconf_add_dev(dev)) == NULL) {
1977                 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
1978                 return;
1979         }
1980         ip6_tnl_add_linklocal(idev);
1981         addrconf_add_mroute(dev);
1982 }
1983
1984 static int addrconf_notify(struct notifier_block *this, unsigned long event, 
1985                            void * data)
1986 {
1987         struct net_device *dev = (struct net_device *) data;
1988         struct inet6_dev *idev = __in6_dev_get(dev);
1989
1990         switch(event) {
1991         case NETDEV_UP:
1992                 switch(dev->type) {
1993                 case ARPHRD_SIT:
1994                         addrconf_sit_config(dev);
1995                         break;
1996                 case ARPHRD_TUNNEL6:
1997                         addrconf_ip6_tnl_config(dev);
1998                         break;
1999                 case ARPHRD_LOOPBACK:
2000                         init_loopback(dev);
2001                         break;
2002
2003                 default:
2004                         addrconf_dev_config(dev);
2005                         break;
2006                 };
2007                 if (idev) {
2008                         /* If the MTU changed during the interface down, when the
2009                            interface up, the changed MTU must be reflected in the
2010                            idev as well as routers.
2011                          */
2012                         if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2013                                 rt6_mtu_change(dev, dev->mtu);
2014                                 idev->cnf.mtu6 = dev->mtu;
2015                         }
2016                         idev->tstamp = jiffies;
2017                         inet6_ifinfo_notify(RTM_NEWLINK, idev);
2018                         /* If the changed mtu during down is lower than IPV6_MIN_MTU
2019                            stop IPv6 on this interface.
2020                          */
2021                         if (dev->mtu < IPV6_MIN_MTU)
2022                                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2023                 }
2024                 break;
2025
2026         case NETDEV_CHANGEMTU:
2027                 if ( idev && dev->mtu >= IPV6_MIN_MTU) {
2028                         rt6_mtu_change(dev, dev->mtu);
2029                         idev->cnf.mtu6 = dev->mtu;
2030                         break;
2031                 }
2032
2033                 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2034
2035         case NETDEV_DOWN:
2036         case NETDEV_UNREGISTER:
2037                 /*
2038                  *      Remove all addresses from this interface.
2039                  */
2040                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2041                 break;
2042         case NETDEV_CHANGE:
2043                 break;
2044         case NETDEV_CHANGENAME:
2045 #ifdef CONFIG_SYSCTL
2046                 if (idev) {
2047                         addrconf_sysctl_unregister(&idev->cnf);
2048                         neigh_sysctl_unregister(idev->nd_parms);
2049                         neigh_sysctl_register(dev, idev->nd_parms,
2050                                               NET_IPV6, NET_IPV6_NEIGH, "ipv6",
2051                                               &ndisc_ifinfo_sysctl_change,
2052                                               NULL);
2053                         addrconf_sysctl_register(idev, &idev->cnf);
2054                 }
2055 #endif
2056                 break;
2057         };
2058
2059         return NOTIFY_OK;
2060 }
2061
2062 /*
2063  *      addrconf module should be notified of a device going up
2064  */
2065 static struct notifier_block ipv6_dev_notf = {
2066         .notifier_call = addrconf_notify,
2067         .priority = 0
2068 };
2069
2070 static int addrconf_ifdown(struct net_device *dev, int how)
2071 {
2072         struct inet6_dev *idev;
2073         struct inet6_ifaddr *ifa, **bifa;
2074         int i;
2075
2076         ASSERT_RTNL();
2077
2078         if (dev == &loopback_dev && how == 1)
2079                 how = 0;
2080
2081         rt6_ifdown(dev);
2082         neigh_ifdown(&nd_tbl, dev);
2083
2084         idev = __in6_dev_get(dev);
2085         if (idev == NULL)
2086                 return -ENODEV;
2087
2088         /* Step 1: remove reference to ipv6 device from parent device.
2089                    Do not dev_put!
2090          */
2091         if (how == 1) {
2092                 write_lock_bh(&addrconf_lock);
2093                 dev->ip6_ptr = NULL;
2094                 idev->dead = 1;
2095                 write_unlock_bh(&addrconf_lock);
2096
2097                 /* Step 1.5: remove snmp6 entry */
2098                 snmp6_unregister_dev(idev);
2099
2100         }
2101
2102         /* Step 2: clear hash table */
2103         for (i=0; i<IN6_ADDR_HSIZE; i++) {
2104                 bifa = &inet6_addr_lst[i];
2105
2106                 write_lock_bh(&addrconf_hash_lock);
2107                 while ((ifa = *bifa) != NULL) {
2108                         if (ifa->idev == idev) {
2109                                 *bifa = ifa->lst_next;
2110                                 ifa->lst_next = NULL;
2111                                 addrconf_del_timer(ifa);
2112                                 in6_ifa_put(ifa);
2113                                 continue;
2114                         }
2115                         bifa = &ifa->lst_next;
2116                 }
2117                 write_unlock_bh(&addrconf_hash_lock);
2118         }
2119
2120         write_lock_bh(&idev->lock);
2121
2122         /* Step 3: clear flags for stateless addrconf */
2123         if (how != 1)
2124                 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD);
2125
2126         /* Step 4: clear address list */
2127 #ifdef CONFIG_IPV6_PRIVACY
2128         if (how == 1 && del_timer(&idev->regen_timer))
2129                 in6_dev_put(idev);
2130
2131         /* clear tempaddr list */
2132         while ((ifa = idev->tempaddr_list) != NULL) {
2133                 idev->tempaddr_list = ifa->tmp_next;
2134                 ifa->tmp_next = NULL;
2135                 ifa->dead = 1;
2136                 write_unlock_bh(&idev->lock);
2137                 spin_lock_bh(&ifa->lock);
2138
2139                 if (ifa->ifpub) {
2140                         in6_ifa_put(ifa->ifpub);
2141                         ifa->ifpub = NULL;
2142                 }
2143                 spin_unlock_bh(&ifa->lock);
2144                 in6_ifa_put(ifa);
2145                 write_lock_bh(&idev->lock);
2146         }
2147 #endif
2148         while ((ifa = idev->addr_list) != NULL) {
2149                 idev->addr_list = ifa->if_next;
2150                 ifa->if_next = NULL;
2151                 ifa->dead = 1;
2152                 addrconf_del_timer(ifa);
2153                 write_unlock_bh(&idev->lock);
2154
2155                 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2156                 in6_ifa_put(ifa);
2157
2158                 write_lock_bh(&idev->lock);
2159         }
2160         write_unlock_bh(&idev->lock);
2161
2162         /* Step 5: Discard multicast list */
2163
2164         if (how == 1)
2165                 ipv6_mc_destroy_dev(idev);
2166         else
2167                 ipv6_mc_down(idev);
2168
2169         /* Step 5: netlink notification of this interface */
2170         idev->tstamp = jiffies;
2171         inet6_ifinfo_notify(RTM_NEWLINK, idev);
2172         
2173         /* Shot the device (if unregistered) */
2174
2175         if (how == 1) {
2176 #ifdef CONFIG_SYSCTL
2177                 addrconf_sysctl_unregister(&idev->cnf);
2178                 neigh_sysctl_unregister(idev->nd_parms);
2179 #endif
2180                 neigh_parms_release(&nd_tbl, idev->nd_parms);
2181                 neigh_ifdown(&nd_tbl, dev);
2182                 in6_dev_put(idev);
2183         }
2184         return 0;
2185 }
2186
2187 static void addrconf_rs_timer(unsigned long data)
2188 {
2189         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2190
2191         if (ifp->idev->cnf.forwarding)
2192                 goto out;
2193
2194         if (ifp->idev->if_flags & IF_RA_RCVD) {
2195                 /*
2196                  *      Announcement received after solicitation
2197                  *      was sent
2198                  */
2199                 goto out;
2200         }
2201
2202         spin_lock(&ifp->lock);
2203         if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2204                 struct in6_addr all_routers;
2205
2206                 /* The wait after the last probe can be shorter */
2207                 addrconf_mod_timer(ifp, AC_RS,
2208                                    (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2209                                    ifp->idev->cnf.rtr_solicit_delay :
2210                                    ifp->idev->cnf.rtr_solicit_interval);
2211                 spin_unlock(&ifp->lock);
2212
2213                 ipv6_addr_all_routers(&all_routers);
2214
2215                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2216         } else {
2217                 spin_unlock(&ifp->lock);
2218                 /*
2219                  * Note: we do not support deprecated "all on-link"
2220                  * assumption any longer.
2221                  */
2222                 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2223                        ifp->idev->dev->name);
2224         }
2225
2226 out:
2227         in6_ifa_put(ifp);
2228 }
2229
2230 /*
2231  *      Duplicate Address Detection
2232  */
2233 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2234 {
2235         struct inet6_dev *idev = ifp->idev;
2236         struct net_device *dev = idev->dev;
2237         unsigned long rand_num;
2238
2239         addrconf_join_solict(dev, &ifp->addr);
2240
2241         if (ifp->prefix_len != 128 && (ifp->flags&IFA_F_PERMANENT))
2242                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 0,
2243                                         flags);
2244
2245         net_srandom(ifp->addr.s6_addr32[3]);
2246         rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2247
2248         read_lock_bh(&idev->lock);
2249         if (ifp->dead)
2250                 goto out;
2251         spin_lock_bh(&ifp->lock);
2252
2253         if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2254             !(ifp->flags&IFA_F_TENTATIVE)) {
2255                 ifp->flags &= ~IFA_F_TENTATIVE;
2256                 spin_unlock_bh(&ifp->lock);
2257                 read_unlock_bh(&idev->lock);
2258
2259                 addrconf_dad_completed(ifp);
2260                 return;
2261         }
2262
2263         ifp->probes = idev->cnf.dad_transmits;
2264         addrconf_mod_timer(ifp, AC_DAD, rand_num);
2265
2266         spin_unlock_bh(&ifp->lock);
2267 out:
2268         read_unlock_bh(&idev->lock);
2269 }
2270
2271 static void addrconf_dad_timer(unsigned long data)
2272 {
2273         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2274         struct inet6_dev *idev = ifp->idev;
2275         struct in6_addr unspec;
2276         struct in6_addr mcaddr;
2277
2278         read_lock_bh(&idev->lock);
2279         if (idev->dead) {
2280                 read_unlock_bh(&idev->lock);
2281                 goto out;
2282         }
2283         spin_lock_bh(&ifp->lock);
2284         if (ifp->probes == 0) {
2285                 /*
2286                  * DAD was successful
2287                  */
2288
2289                 ifp->flags &= ~IFA_F_TENTATIVE;
2290                 spin_unlock_bh(&ifp->lock);
2291                 read_unlock_bh(&idev->lock);
2292
2293                 addrconf_dad_completed(ifp);
2294
2295                 goto out;
2296         }
2297
2298         ifp->probes--;
2299         addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2300         spin_unlock_bh(&ifp->lock);
2301         read_unlock_bh(&idev->lock);
2302
2303         /* send a neighbour solicitation for our addr */
2304         memset(&unspec, 0, sizeof(unspec));
2305         addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2306         ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec);
2307 out:
2308         in6_ifa_put(ifp);
2309 }
2310
2311 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2312 {
2313         struct net_device *     dev = ifp->idev->dev;
2314
2315         /*
2316          *      Configure the address for reception. Now it is valid.
2317          */
2318
2319         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2320
2321         /* If added prefix is link local and forwarding is off,
2322            start sending router solicitations.
2323          */
2324
2325         if (ifp->idev->cnf.forwarding == 0 &&
2326             ifp->idev->cnf.rtr_solicits > 0 &&
2327             (dev->flags&IFF_LOOPBACK) == 0 &&
2328             (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2329                 struct in6_addr all_routers;
2330
2331                 ipv6_addr_all_routers(&all_routers);
2332
2333                 /*
2334                  *      If a host as already performed a random delay
2335                  *      [...] as part of DAD [...] there is no need
2336                  *      to delay again before sending the first RS
2337                  */
2338                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2339
2340                 spin_lock_bh(&ifp->lock);
2341                 ifp->probes = 1;
2342                 ifp->idev->if_flags |= IF_RS_SENT;
2343                 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2344                 spin_unlock_bh(&ifp->lock);
2345         }
2346 }
2347
2348 #ifdef CONFIG_PROC_FS
2349 struct if6_iter_state {
2350         int bucket;
2351 };
2352
2353 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2354 {
2355         struct inet6_ifaddr *ifa = NULL;
2356         struct if6_iter_state *state = seq->private;
2357
2358         for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2359                 ifa = inet6_addr_lst[state->bucket];
2360                 if (ifa)
2361                         break;
2362         }
2363         return ifa;
2364 }
2365
2366 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2367 {
2368         struct if6_iter_state *state = seq->private;
2369
2370         ifa = ifa->lst_next;
2371 try_again:
2372         if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2373                 ifa = inet6_addr_lst[state->bucket];
2374                 goto try_again;
2375         }
2376         return ifa;
2377 }
2378
2379 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2380 {
2381         struct inet6_ifaddr *ifa = if6_get_first(seq);
2382
2383         if (ifa)
2384                 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2385                         --pos;
2386         return pos ? NULL : ifa;
2387 }
2388
2389 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2390 {
2391         read_lock_bh(&addrconf_hash_lock);
2392         return if6_get_idx(seq, *pos);
2393 }
2394
2395 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2396 {
2397         struct inet6_ifaddr *ifa;
2398
2399         ifa = if6_get_next(seq, v);
2400         ++*pos;
2401         return ifa;
2402 }
2403
2404 static void if6_seq_stop(struct seq_file *seq, void *v)
2405 {
2406         read_unlock_bh(&addrconf_hash_lock);
2407 }
2408
2409 static int if6_seq_show(struct seq_file *seq, void *v)
2410 {
2411         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2412         seq_printf(seq,
2413                    "%04x%04x%04x%04x%04x%04x%04x%04x %02x %02x %02x %02x %8s\n",
2414                    NIP6(ifp->addr),
2415                    ifp->idev->dev->ifindex,
2416                    ifp->prefix_len,
2417                    ifp->scope,
2418                    ifp->flags,
2419                    ifp->idev->dev->name);
2420         return 0;
2421 }
2422
2423 static struct seq_operations if6_seq_ops = {
2424         .start  = if6_seq_start,
2425         .next   = if6_seq_next,
2426         .show   = if6_seq_show,
2427         .stop   = if6_seq_stop,
2428 };
2429
2430 static int if6_seq_open(struct inode *inode, struct file *file)
2431 {
2432         struct seq_file *seq;
2433         int rc = -ENOMEM;
2434         struct if6_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL);
2435
2436         if (!s)
2437                 goto out;
2438         memset(s, 0, sizeof(*s));
2439
2440         rc = seq_open(file, &if6_seq_ops);
2441         if (rc)
2442                 goto out_kfree;
2443
2444         seq = file->private_data;
2445         seq->private = s;
2446 out:
2447         return rc;
2448 out_kfree:
2449         kfree(s);
2450         goto out;
2451 }
2452
2453 static struct file_operations if6_fops = {
2454         .owner          = THIS_MODULE,
2455         .open           = if6_seq_open,
2456         .read           = seq_read,
2457         .llseek         = seq_lseek,
2458         .release        = seq_release_private,
2459 };
2460
2461 int __init if6_proc_init(void)
2462 {
2463         if (!proc_net_fops_create("if_inet6", S_IRUGO, &if6_fops))
2464                 return -ENOMEM;
2465         return 0;
2466 }
2467
2468 void if6_proc_exit(void)
2469 {
2470         proc_net_remove("if_inet6");
2471 }
2472 #endif  /* CONFIG_PROC_FS */
2473
2474 /*
2475  *      Periodic address status verification
2476  */
2477
2478 static void addrconf_verify(unsigned long foo)
2479 {
2480         struct inet6_ifaddr *ifp;
2481         unsigned long now, next;
2482         int i;
2483
2484         spin_lock_bh(&addrconf_verify_lock);
2485         now = jiffies;
2486         next = now + ADDR_CHECK_FREQUENCY;
2487
2488         del_timer(&addr_chk_timer);
2489
2490         for (i=0; i < IN6_ADDR_HSIZE; i++) {
2491
2492 restart:
2493                 write_lock(&addrconf_hash_lock);
2494                 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
2495                         unsigned long age;
2496 #ifdef CONFIG_IPV6_PRIVACY
2497                         unsigned long regen_advance;
2498 #endif
2499
2500                         if (ifp->flags & IFA_F_PERMANENT)
2501                                 continue;
2502
2503                         spin_lock(&ifp->lock);
2504                         age = (now - ifp->tstamp) / HZ;
2505
2506 #ifdef CONFIG_IPV6_PRIVACY
2507                         regen_advance = ifp->idev->cnf.regen_max_retry * 
2508                                         ifp->idev->cnf.dad_transmits * 
2509                                         ifp->idev->nd_parms->retrans_time / HZ;
2510 #endif
2511
2512                         if (age >= ifp->valid_lft) {
2513                                 spin_unlock(&ifp->lock);
2514                                 in6_ifa_hold(ifp);
2515                                 write_unlock(&addrconf_hash_lock);
2516                                 ipv6_del_addr(ifp);
2517                                 goto restart;
2518                         } else if (age >= ifp->prefered_lft) {
2519                                 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
2520                                 int deprecate = 0;
2521
2522                                 if (!(ifp->flags&IFA_F_DEPRECATED)) {
2523                                         deprecate = 1;
2524                                         ifp->flags |= IFA_F_DEPRECATED;
2525                                 }
2526
2527                                 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
2528                                         next = ifp->tstamp + ifp->valid_lft * HZ;
2529
2530                                 spin_unlock(&ifp->lock);
2531
2532                                 if (deprecate) {
2533                                         in6_ifa_hold(ifp);
2534                                         write_unlock(&addrconf_hash_lock);
2535
2536                                         ipv6_ifa_notify(0, ifp);
2537                                         in6_ifa_put(ifp);
2538                                         goto restart;
2539                                 }
2540 #ifdef CONFIG_IPV6_PRIVACY
2541                         } else if ((ifp->flags&IFA_F_TEMPORARY) &&
2542                                    !(ifp->flags&IFA_F_TENTATIVE)) {
2543                                 if (age >= ifp->prefered_lft - regen_advance) {
2544                                         struct inet6_ifaddr *ifpub = ifp->ifpub;
2545                                         if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2546                                                 next = ifp->tstamp + ifp->prefered_lft * HZ;
2547                                         if (!ifp->regen_count && ifpub) {
2548                                                 ifp->regen_count++;
2549                                                 in6_ifa_hold(ifp);
2550                                                 in6_ifa_hold(ifpub);
2551                                                 spin_unlock(&ifp->lock);
2552                                                 write_unlock(&addrconf_hash_lock);
2553                                                 ipv6_create_tempaddr(ifpub, ifp);
2554                                                 in6_ifa_put(ifpub);
2555                                                 in6_ifa_put(ifp);
2556                                                 goto restart;
2557                                         }
2558                                 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
2559                                         next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
2560                                 spin_unlock(&ifp->lock);
2561 #endif
2562                         } else {
2563                                 /* ifp->prefered_lft <= ifp->valid_lft */
2564                                 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2565                                         next = ifp->tstamp + ifp->prefered_lft * HZ;
2566                                 spin_unlock(&ifp->lock);
2567                         }
2568                 }
2569                 write_unlock(&addrconf_hash_lock);
2570         }
2571
2572         addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
2573         add_timer(&addr_chk_timer);
2574         spin_unlock_bh(&addrconf_verify_lock);
2575 }
2576
2577 static int
2578 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
2579 {
2580         struct rtattr **rta = arg;
2581         struct ifaddrmsg *ifm = NLMSG_DATA(nlh);
2582         struct in6_addr *pfx;
2583
2584         pfx = NULL;
2585         if (rta[IFA_ADDRESS-1]) {
2586                 if (RTA_PAYLOAD(rta[IFA_ADDRESS-1]) < sizeof(*pfx))
2587                         return -EINVAL;
2588                 pfx = RTA_DATA(rta[IFA_ADDRESS-1]);
2589         }
2590         if (rta[IFA_LOCAL-1]) {
2591                 if (pfx && memcmp(pfx, RTA_DATA(rta[IFA_LOCAL-1]), sizeof(*pfx)))
2592                         return -EINVAL;
2593                 pfx = RTA_DATA(rta[IFA_LOCAL-1]);
2594         }
2595         if (pfx == NULL)
2596                 return -EINVAL;
2597
2598         return inet6_addr_del(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
2599 }
2600
2601 static int
2602 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
2603 {
2604         struct rtattr  **rta = arg;
2605         struct ifaddrmsg *ifm = NLMSG_DATA(nlh);
2606         struct in6_addr *pfx;
2607
2608         pfx = NULL;
2609         if (rta[IFA_ADDRESS-1]) {
2610                 if (RTA_PAYLOAD(rta[IFA_ADDRESS-1]) < sizeof(*pfx))
2611                         return -EINVAL;
2612                 pfx = RTA_DATA(rta[IFA_ADDRESS-1]);
2613         }
2614         if (rta[IFA_LOCAL-1]) {
2615                 if (pfx && memcmp(pfx, RTA_DATA(rta[IFA_LOCAL-1]), sizeof(*pfx)))
2616                         return -EINVAL;
2617                 pfx = RTA_DATA(rta[IFA_LOCAL-1]);
2618         }
2619         if (pfx == NULL)
2620                 return -EINVAL;
2621
2622         return inet6_addr_add(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
2623 }
2624
2625 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
2626                              u32 pid, u32 seq, int event, unsigned int flags)
2627 {
2628         struct ifaddrmsg *ifm;
2629         struct nlmsghdr  *nlh;
2630         struct ifa_cacheinfo ci;
2631         unsigned char    *b = skb->tail;
2632
2633         nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags);
2634         ifm = NLMSG_DATA(nlh);
2635         ifm->ifa_family = AF_INET6;
2636         ifm->ifa_prefixlen = ifa->prefix_len;
2637         ifm->ifa_flags = ifa->flags;
2638         ifm->ifa_scope = RT_SCOPE_UNIVERSE;
2639         if (ifa->scope&IFA_HOST)
2640                 ifm->ifa_scope = RT_SCOPE_HOST;
2641         else if (ifa->scope&IFA_LINK)
2642                 ifm->ifa_scope = RT_SCOPE_LINK;
2643         else if (ifa->scope&IFA_SITE)
2644                 ifm->ifa_scope = RT_SCOPE_SITE;
2645         ifm->ifa_index = ifa->idev->dev->ifindex;
2646         RTA_PUT(skb, IFA_ADDRESS, 16, &ifa->addr);
2647         if (!(ifa->flags&IFA_F_PERMANENT)) {
2648                 ci.ifa_prefered = ifa->prefered_lft;
2649                 ci.ifa_valid = ifa->valid_lft;
2650                 if (ci.ifa_prefered != INFINITY_LIFE_TIME) {
2651                         long tval = (jiffies - ifa->tstamp)/HZ;
2652                         ci.ifa_prefered -= tval;
2653                         if (ci.ifa_valid != INFINITY_LIFE_TIME)
2654                                 ci.ifa_valid -= tval;
2655                 }
2656         } else {
2657                 ci.ifa_prefered = INFINITY_LIFE_TIME;
2658                 ci.ifa_valid = INFINITY_LIFE_TIME;
2659         }
2660         ci.cstamp = (__u32)(TIME_DELTA(ifa->cstamp, INITIAL_JIFFIES) / HZ * 100
2661                     + TIME_DELTA(ifa->cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
2662         ci.tstamp = (__u32)(TIME_DELTA(ifa->tstamp, INITIAL_JIFFIES) / HZ * 100
2663                     + TIME_DELTA(ifa->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
2664         RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci);
2665         nlh->nlmsg_len = skb->tail - b;
2666         return skb->len;
2667
2668 nlmsg_failure:
2669 rtattr_failure:
2670         skb_trim(skb, b - skb->data);
2671         return -1;
2672 }
2673
2674 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
2675                                 u32 pid, u32 seq, int event, u16 flags)
2676 {
2677         struct ifaddrmsg *ifm;
2678         struct nlmsghdr  *nlh;
2679         struct ifa_cacheinfo ci;
2680         unsigned char    *b = skb->tail;
2681
2682         nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags);
2683         ifm = NLMSG_DATA(nlh);
2684         ifm->ifa_family = AF_INET6;     
2685         ifm->ifa_prefixlen = 128;
2686         ifm->ifa_flags = IFA_F_PERMANENT;
2687         ifm->ifa_scope = RT_SCOPE_UNIVERSE;
2688         if (ipv6_addr_scope(&ifmca->mca_addr)&IFA_SITE)
2689                 ifm->ifa_scope = RT_SCOPE_SITE;
2690         ifm->ifa_index = ifmca->idev->dev->ifindex;
2691         RTA_PUT(skb, IFA_MULTICAST, 16, &ifmca->mca_addr);
2692         ci.cstamp = (__u32)(TIME_DELTA(ifmca->mca_cstamp, INITIAL_JIFFIES) / HZ
2693                     * 100 + TIME_DELTA(ifmca->mca_cstamp, INITIAL_JIFFIES) % HZ
2694                     * 100 / HZ);
2695         ci.tstamp = (__u32)(TIME_DELTA(ifmca->mca_tstamp, INITIAL_JIFFIES) / HZ
2696                     * 100 + TIME_DELTA(ifmca->mca_tstamp, INITIAL_JIFFIES) % HZ
2697                     * 100 / HZ);
2698         ci.ifa_prefered = INFINITY_LIFE_TIME;
2699         ci.ifa_valid = INFINITY_LIFE_TIME;
2700         RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci);
2701         nlh->nlmsg_len = skb->tail - b;
2702         return skb->len;
2703
2704 nlmsg_failure:
2705 rtattr_failure:
2706         skb_trim(skb, b - skb->data);
2707         return -1;
2708 }
2709
2710 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
2711                                 u32 pid, u32 seq, int event, unsigned int flags)
2712 {
2713         struct ifaddrmsg *ifm;
2714         struct nlmsghdr  *nlh;
2715         struct ifa_cacheinfo ci;
2716         unsigned char    *b = skb->tail;
2717
2718         nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags);
2719         ifm = NLMSG_DATA(nlh);
2720         ifm->ifa_family = AF_INET6;     
2721         ifm->ifa_prefixlen = 128;
2722         ifm->ifa_flags = IFA_F_PERMANENT;
2723         ifm->ifa_scope = RT_SCOPE_UNIVERSE;
2724         if (ipv6_addr_scope(&ifaca->aca_addr)&IFA_SITE)
2725                 ifm->ifa_scope = RT_SCOPE_SITE;
2726         ifm->ifa_index = ifaca->aca_idev->dev->ifindex;
2727         RTA_PUT(skb, IFA_ANYCAST, 16, &ifaca->aca_addr);
2728         ci.cstamp = (__u32)(TIME_DELTA(ifaca->aca_cstamp, INITIAL_JIFFIES) / HZ
2729                     * 100 + TIME_DELTA(ifaca->aca_cstamp, INITIAL_JIFFIES) % HZ
2730                     * 100 / HZ);
2731         ci.tstamp = (__u32)(TIME_DELTA(ifaca->aca_tstamp, INITIAL_JIFFIES) / HZ
2732                     * 100 + TIME_DELTA(ifaca->aca_tstamp, INITIAL_JIFFIES) % HZ
2733                     * 100 / HZ);
2734         ci.ifa_prefered = INFINITY_LIFE_TIME;
2735         ci.ifa_valid = INFINITY_LIFE_TIME;
2736         RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci);
2737         nlh->nlmsg_len = skb->tail - b;
2738         return skb->len;
2739
2740 nlmsg_failure:
2741 rtattr_failure:
2742         skb_trim(skb, b - skb->data);
2743         return -1;
2744 }
2745
2746 enum addr_type_t
2747 {
2748         UNICAST_ADDR,
2749         MULTICAST_ADDR,
2750         ANYCAST_ADDR,
2751 };
2752
2753 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
2754                            enum addr_type_t type)
2755 {
2756         int idx, ip_idx;
2757         int s_idx, s_ip_idx;
2758         int err = 1;
2759         struct net_device *dev;
2760         struct inet6_dev *idev = NULL;
2761         struct inet6_ifaddr *ifa;
2762         struct ifmcaddr6 *ifmca;
2763         struct ifacaddr6 *ifaca;
2764
2765         s_idx = cb->args[0];
2766         s_ip_idx = ip_idx = cb->args[1];
2767         read_lock(&dev_base_lock);
2768         
2769         for (dev = dev_base, idx = 0; dev; dev = dev->next, idx++) {
2770                 if (idx < s_idx)
2771                         continue;
2772                 if (idx > s_idx)
2773                         s_ip_idx = 0;
2774                 ip_idx = 0;
2775                 if ((idev = in6_dev_get(dev)) == NULL)
2776                         continue;
2777                 read_lock_bh(&idev->lock);
2778                 switch (type) {
2779                 case UNICAST_ADDR:
2780                         /* unicast address */
2781                         for (ifa = idev->addr_list; ifa;
2782                              ifa = ifa->if_next, ip_idx++) {
2783                                 if (ip_idx < s_ip_idx)
2784                                         continue;
2785                                 if ((err = inet6_fill_ifaddr(skb, ifa, 
2786                                     NETLINK_CB(cb->skb).pid, 
2787                                     cb->nlh->nlmsg_seq, RTM_NEWADDR,
2788                                     NLM_F_MULTI)) <= 0)
2789                                         goto done;
2790                         }
2791                         /* temp addr */
2792 #ifdef CONFIG_IPV6_PRIVACY
2793                         for (ifa = idev->tempaddr_list; ifa; 
2794                              ifa = ifa->tmp_next, ip_idx++) {
2795                                 if (ip_idx < s_ip_idx)
2796                                         continue;
2797                                 if ((err = inet6_fill_ifaddr(skb, ifa, 
2798                                     NETLINK_CB(cb->skb).pid, 
2799                                     cb->nlh->nlmsg_seq, RTM_NEWADDR,
2800                                     NLM_F_MULTI)) <= 0) 
2801                                         goto done;
2802                         }
2803 #endif
2804                         break;
2805                 case MULTICAST_ADDR:
2806                         /* multicast address */
2807                         for (ifmca = idev->mc_list; ifmca; 
2808                              ifmca = ifmca->next, ip_idx++) {
2809                                 if (ip_idx < s_ip_idx)
2810                                         continue;
2811                                 if ((err = inet6_fill_ifmcaddr(skb, ifmca, 
2812                                     NETLINK_CB(cb->skb).pid, 
2813                                     cb->nlh->nlmsg_seq, RTM_GETMULTICAST,
2814                                     NLM_F_MULTI)) <= 0)
2815                                         goto done;
2816                         }
2817                         break;
2818                 case ANYCAST_ADDR:
2819                         /* anycast address */
2820                         for (ifaca = idev->ac_list; ifaca;
2821                              ifaca = ifaca->aca_next, ip_idx++) {
2822                                 if (ip_idx < s_ip_idx)
2823                                         continue;
2824                                 if ((err = inet6_fill_ifacaddr(skb, ifaca, 
2825                                     NETLINK_CB(cb->skb).pid, 
2826                                     cb->nlh->nlmsg_seq, RTM_GETANYCAST,
2827                                     NLM_F_MULTI)) <= 0) 
2828                                         goto done;
2829                         }
2830                         break;
2831                 default:
2832                         break;
2833                 }
2834                 read_unlock_bh(&idev->lock);
2835                 in6_dev_put(idev);
2836         }
2837 done:
2838         if (err <= 0) {
2839                 read_unlock_bh(&idev->lock);
2840                 in6_dev_put(idev);
2841         }
2842         read_unlock(&dev_base_lock);
2843         cb->args[0] = idx;
2844         cb->args[1] = ip_idx;
2845         return skb->len;
2846 }
2847
2848 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
2849 {
2850         enum addr_type_t type = UNICAST_ADDR;
2851         return inet6_dump_addr(skb, cb, type);
2852 }
2853
2854 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
2855 {
2856         enum addr_type_t type = MULTICAST_ADDR;
2857         return inet6_dump_addr(skb, cb, type);
2858 }
2859
2860
2861 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
2862 {
2863         enum addr_type_t type = ANYCAST_ADDR;
2864         return inet6_dump_addr(skb, cb, type);
2865 }
2866
2867 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
2868 {
2869         struct sk_buff *skb;
2870         int size = NLMSG_SPACE(sizeof(struct ifaddrmsg)+128);
2871
2872         skb = alloc_skb(size, GFP_ATOMIC);
2873         if (!skb) {
2874                 netlink_set_err(rtnl, 0, RTMGRP_IPV6_IFADDR, ENOBUFS);
2875                 return;
2876         }
2877         if (inet6_fill_ifaddr(skb, ifa, current->pid, 0, event, 0) < 0) {
2878                 kfree_skb(skb);
2879                 netlink_set_err(rtnl, 0, RTMGRP_IPV6_IFADDR, EINVAL);
2880                 return;
2881         }
2882         NETLINK_CB(skb).dst_groups = RTMGRP_IPV6_IFADDR;
2883         netlink_broadcast(rtnl, skb, 0, RTMGRP_IPV6_IFADDR, GFP_ATOMIC);
2884 }
2885
2886 static void inline ipv6_store_devconf(struct ipv6_devconf *cnf,
2887                                 __s32 *array, int bytes)
2888 {
2889         memset(array, 0, bytes);
2890         array[DEVCONF_FORWARDING] = cnf->forwarding;
2891         array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
2892         array[DEVCONF_MTU6] = cnf->mtu6;
2893         array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
2894         array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
2895         array[DEVCONF_AUTOCONF] = cnf->autoconf;
2896         array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
2897         array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
2898         array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
2899         array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
2900         array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
2901 #ifdef CONFIG_IPV6_PRIVACY
2902         array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
2903         array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
2904         array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
2905         array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
2906         array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
2907 #endif
2908         array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
2909 }
2910
2911 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 
2912                              u32 pid, u32 seq, int event, unsigned int flags)
2913 {
2914         struct net_device       *dev = idev->dev;
2915         __s32                   *array = NULL;
2916         struct ifinfomsg        *r;
2917         struct nlmsghdr         *nlh;
2918         unsigned char           *b = skb->tail;
2919         struct rtattr           *subattr;
2920         __u32                   mtu = dev->mtu;
2921         struct ifla_cacheinfo   ci;
2922
2923         nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*r), flags);
2924         r = NLMSG_DATA(nlh);
2925         r->ifi_family = AF_INET6;
2926         r->ifi_type = dev->type;
2927         r->ifi_index = dev->ifindex;
2928         r->ifi_flags = dev_get_flags(dev);
2929         r->ifi_change = 0;
2930
2931         RTA_PUT(skb, IFLA_IFNAME, strlen(dev->name)+1, dev->name);
2932
2933         if (dev->addr_len)
2934                 RTA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
2935
2936         RTA_PUT(skb, IFLA_MTU, sizeof(mtu), &mtu);
2937         if (dev->ifindex != dev->iflink)
2938                 RTA_PUT(skb, IFLA_LINK, sizeof(int), &dev->iflink);
2939                         
2940         subattr = (struct rtattr*)skb->tail;
2941
2942         RTA_PUT(skb, IFLA_PROTINFO, 0, NULL);
2943
2944         /* return the device flags */
2945         RTA_PUT(skb, IFLA_INET6_FLAGS, sizeof(__u32), &idev->if_flags);
2946
2947         /* return interface cacheinfo */
2948         ci.max_reasm_len = IPV6_MAXPLEN;
2949         ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
2950                     + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
2951         ci.reachable_time = idev->nd_parms->reachable_time;
2952         ci.retrans_time = idev->nd_parms->retrans_time;
2953         RTA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
2954         
2955         /* return the device sysctl params */
2956         if ((array = kmalloc(DEVCONF_MAX * sizeof(*array), GFP_ATOMIC)) == NULL)
2957                 goto rtattr_failure;
2958         ipv6_store_devconf(&idev->cnf, array, DEVCONF_MAX * sizeof(*array));
2959         RTA_PUT(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(*array), array);
2960
2961         /* XXX - Statistics/MC not implemented */
2962         subattr->rta_len = skb->tail - (u8*)subattr;
2963
2964         nlh->nlmsg_len = skb->tail - b;
2965         kfree(array);
2966         return skb->len;
2967
2968 nlmsg_failure:
2969 rtattr_failure:
2970         if (array)
2971                 kfree(array);
2972         skb_trim(skb, b - skb->data);
2973         return -1;
2974 }
2975
2976 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
2977 {
2978         int idx, err;
2979         int s_idx = cb->args[0];
2980         struct net_device *dev;
2981         struct inet6_dev *idev;
2982
2983         read_lock(&dev_base_lock);
2984         for (dev=dev_base, idx=0; dev; dev = dev->next, idx++) {
2985                 if (idx < s_idx)
2986                         continue;
2987                 if ((idev = in6_dev_get(dev)) == NULL)
2988                         continue;
2989                 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid, 
2990                                 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
2991                 in6_dev_put(idev);
2992                 if (err <= 0)
2993                         break;
2994         }
2995         read_unlock(&dev_base_lock);
2996         cb->args[0] = idx;
2997
2998         return skb->len;
2999 }
3000
3001 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3002 {
3003         struct sk_buff *skb;
3004         /* 128 bytes ?? */
3005         int size = NLMSG_SPACE(sizeof(struct ifinfomsg)+128);
3006         
3007         skb = alloc_skb(size, GFP_ATOMIC);
3008         if (!skb) {
3009                 netlink_set_err(rtnl, 0, RTMGRP_IPV6_IFINFO, ENOBUFS);
3010                 return;
3011         }
3012         if (inet6_fill_ifinfo(skb, idev, current->pid, 0, event, 0) < 0) {
3013                 kfree_skb(skb);
3014                 netlink_set_err(rtnl, 0, RTMGRP_IPV6_IFINFO, EINVAL);
3015                 return;
3016         }
3017         NETLINK_CB(skb).dst_groups = RTMGRP_IPV6_IFINFO;
3018         netlink_broadcast(rtnl, skb, 0, RTMGRP_IPV6_IFINFO, GFP_ATOMIC);
3019 }
3020
3021 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
3022                         struct prefix_info *pinfo, u32 pid, u32 seq, 
3023                         int event, unsigned int flags)
3024 {
3025         struct prefixmsg        *pmsg;
3026         struct nlmsghdr         *nlh;
3027         unsigned char           *b = skb->tail;
3028         struct prefix_cacheinfo ci;
3029
3030         nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*pmsg), flags);
3031         pmsg = NLMSG_DATA(nlh);
3032         pmsg->prefix_family = AF_INET6;
3033         pmsg->prefix_ifindex = idev->dev->ifindex;
3034         pmsg->prefix_len = pinfo->prefix_len;
3035         pmsg->prefix_type = pinfo->type;
3036         
3037         pmsg->prefix_flags = 0;
3038         if (pinfo->onlink)
3039                 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3040         if (pinfo->autoconf)
3041                 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3042
3043         RTA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
3044
3045         ci.preferred_time = ntohl(pinfo->prefered);
3046         ci.valid_time = ntohl(pinfo->valid);
3047         RTA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
3048
3049         nlh->nlmsg_len = skb->tail - b;
3050         return skb->len;
3051
3052 nlmsg_failure:
3053 rtattr_failure:
3054         skb_trim(skb, b - skb->data);
3055         return -1;
3056 }
3057
3058 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 
3059                          struct prefix_info *pinfo)
3060 {
3061         struct sk_buff *skb;
3062         int size = NLMSG_SPACE(sizeof(struct prefixmsg)+128);
3063
3064         skb = alloc_skb(size, GFP_ATOMIC);
3065         if (!skb) {
3066                 netlink_set_err(rtnl, 0, RTMGRP_IPV6_PREFIX, ENOBUFS);
3067                 return;
3068         }
3069         if (inet6_fill_prefix(skb, idev, pinfo, current->pid, 0, event, 0) < 0) {
3070                 kfree_skb(skb);
3071                 netlink_set_err(rtnl, 0, RTMGRP_IPV6_PREFIX, EINVAL);
3072                 return;
3073         }
3074         NETLINK_CB(skb).dst_groups = RTMGRP_IPV6_PREFIX;
3075         netlink_broadcast(rtnl, skb, 0, RTMGRP_IPV6_PREFIX, GFP_ATOMIC);
3076 }
3077
3078 static struct rtnetlink_link inet6_rtnetlink_table[RTM_NR_MSGTYPES] = {
3079         [RTM_GETLINK - RTM_BASE] = { .dumpit    = inet6_dump_ifinfo, },
3080         [RTM_NEWADDR - RTM_BASE] = { .doit      = inet6_rtm_newaddr, },
3081         [RTM_DELADDR - RTM_BASE] = { .doit      = inet6_rtm_deladdr, },
3082         [RTM_GETADDR - RTM_BASE] = { .dumpit    = inet6_dump_ifaddr, },
3083         [RTM_GETMULTICAST - RTM_BASE] = { .dumpit = inet6_dump_ifmcaddr, },
3084         [RTM_GETANYCAST - RTM_BASE] = { .dumpit = inet6_dump_ifacaddr, },
3085         [RTM_NEWROUTE - RTM_BASE] = { .doit     = inet6_rtm_newroute, },
3086         [RTM_DELROUTE - RTM_BASE] = { .doit     = inet6_rtm_delroute, },
3087         [RTM_GETROUTE - RTM_BASE] = { .doit     = inet6_rtm_getroute,
3088                                       .dumpit   = inet6_dump_fib, },
3089 };
3090
3091 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3092 {
3093         inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3094
3095         switch (event) {
3096         case RTM_NEWADDR:
3097                 dst_hold(&ifp->rt->u.dst);
3098                 if (ip6_ins_rt(ifp->rt, NULL, NULL, NULL))
3099                         dst_release(&ifp->rt->u.dst);
3100                 if (ifp->idev->cnf.forwarding)
3101                         addrconf_join_anycast(ifp);
3102                 break;
3103         case RTM_DELADDR:
3104                 if (ifp->idev->cnf.forwarding)
3105                         addrconf_leave_anycast(ifp);
3106                 addrconf_leave_solict(ifp->idev, &ifp->addr);
3107                 dst_hold(&ifp->rt->u.dst);
3108                 if (ip6_del_rt(ifp->rt, NULL, NULL, NULL))
3109                         dst_free(&ifp->rt->u.dst);
3110                 else
3111                         dst_release(&ifp->rt->u.dst);
3112                 break;
3113         }
3114 }
3115
3116 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3117 {
3118         read_lock_bh(&addrconf_lock);
3119         if (likely(ifp->idev->dead == 0))
3120                 __ipv6_ifa_notify(event, ifp);
3121         read_unlock_bh(&addrconf_lock);
3122 }
3123
3124 #ifdef CONFIG_SYSCTL
3125
3126 static
3127 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3128                            void __user *buffer, size_t *lenp, loff_t *ppos)
3129 {
3130         int *valp = ctl->data;
3131         int val = *valp;
3132         int ret;
3133
3134         ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3135
3136         if (write && valp != &ipv6_devconf_dflt.forwarding) {
3137                 if (valp != &ipv6_devconf.forwarding) {
3138                         if ((!*valp) ^ (!val)) {
3139                                 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
3140                                 if (idev == NULL)
3141                                         return ret;
3142                                 dev_forward_change(idev);
3143                         }
3144                 } else {
3145                         ipv6_devconf_dflt.forwarding = ipv6_devconf.forwarding;
3146                         addrconf_forward_change();
3147                 }
3148                 if (*valp)
3149                         rt6_purge_dflt_routers();
3150         }
3151
3152         return ret;
3153 }
3154
3155 static int addrconf_sysctl_forward_strategy(ctl_table *table, 
3156                                             int __user *name, int nlen,
3157                                             void __user *oldval,
3158                                             size_t __user *oldlenp,
3159                                             void __user *newval, size_t newlen,
3160                                             void **context)
3161 {
3162         int *valp = table->data;
3163         int new;
3164
3165         if (!newval || !newlen)
3166                 return 0;
3167         if (newlen != sizeof(int))
3168                 return -EINVAL;
3169         if (get_user(new, (int __user *)newval))
3170                 return -EFAULT;
3171         if (new == *valp)
3172                 return 0;
3173         if (oldval && oldlenp) {
3174                 size_t len;
3175                 if (get_user(len, oldlenp))
3176                         return -EFAULT;
3177                 if (len) {
3178                         if (len > table->maxlen)
3179                                 len = table->maxlen;
3180                         if (copy_to_user(oldval, valp, len))
3181                                 return -EFAULT;
3182                         if (put_user(len, oldlenp))
3183                                 return -EFAULT;
3184                 }
3185         }
3186
3187         if (valp != &ipv6_devconf_dflt.forwarding) {
3188                 if (valp != &ipv6_devconf.forwarding) {
3189                         struct inet6_dev *idev = (struct inet6_dev *)table->extra1;
3190                         int changed;
3191                         if (unlikely(idev == NULL))
3192                                 return -ENODEV;
3193                         changed = (!*valp) ^ (!new);
3194                         *valp = new;
3195                         if (changed)
3196                                 dev_forward_change(idev);
3197                 } else {
3198                         *valp = new;
3199                         addrconf_forward_change();
3200                 }
3201
3202                 if (*valp)
3203                         rt6_purge_dflt_routers();
3204         } else
3205                 *valp = new;
3206
3207         return 1;
3208 }
3209
3210 static struct addrconf_sysctl_table
3211 {
3212         struct ctl_table_header *sysctl_header;
3213         ctl_table addrconf_vars[__NET_IPV6_MAX];
3214         ctl_table addrconf_dev[2];
3215         ctl_table addrconf_conf_dir[2];
3216         ctl_table addrconf_proto_dir[2];
3217         ctl_table addrconf_root_dir[2];
3218 } addrconf_sysctl = {
3219         .sysctl_header = NULL,
3220         .addrconf_vars = {
3221                 {
3222                         .ctl_name       =       NET_IPV6_FORWARDING,
3223                         .procname       =       "forwarding",
3224                         .data           =       &ipv6_devconf.forwarding,
3225                         .maxlen         =       sizeof(int),
3226                         .mode           =       0644,
3227                         .proc_handler   =       &addrconf_sysctl_forward,
3228                         .strategy       =       &addrconf_sysctl_forward_strategy,
3229                 },
3230                 {
3231                         .ctl_name       =       NET_IPV6_HOP_LIMIT,
3232                         .procname       =       "hop_limit",
3233                         .data           =       &ipv6_devconf.hop_limit,
3234                         .maxlen         =       sizeof(int),
3235                         .mode           =       0644,
3236                         .proc_handler   =       proc_dointvec,
3237                 },
3238                 {
3239                         .ctl_name       =       NET_IPV6_MTU,
3240                         .procname       =       "mtu",
3241                         .data           =       &ipv6_devconf.mtu6,
3242                         .maxlen         =       sizeof(int),
3243                         .mode           =       0644,
3244                         .proc_handler   =       &proc_dointvec,
3245                 },
3246                 {
3247                         .ctl_name       =       NET_IPV6_ACCEPT_RA,
3248                         .procname       =       "accept_ra",
3249                         .data           =       &ipv6_devconf.accept_ra,
3250                         .maxlen         =       sizeof(int),
3251                         .mode           =       0644,
3252                         .proc_handler   =       &proc_dointvec,
3253                 },
3254                 {
3255                         .ctl_name       =       NET_IPV6_ACCEPT_REDIRECTS,
3256                         .procname       =       "accept_redirects",
3257                         .data           =       &ipv6_devconf.accept_redirects,
3258                         .maxlen         =       sizeof(int),
3259                         .mode           =       0644,
3260                         .proc_handler   =       &proc_dointvec,
3261                 },
3262                 {
3263                         .ctl_name       =       NET_IPV6_AUTOCONF,
3264                         .procname       =       "autoconf",
3265                         .data           =       &ipv6_devconf.autoconf,
3266                         .maxlen         =       sizeof(int),
3267                         .mode           =       0644,
3268                         .proc_handler   =       &proc_dointvec,
3269                 },
3270                 {
3271                         .ctl_name       =       NET_IPV6_DAD_TRANSMITS,
3272                         .procname       =       "dad_transmits",
3273                         .data           =       &ipv6_devconf.dad_transmits,
3274                         .maxlen         =       sizeof(int),
3275                         .mode           =       0644,
3276                         .proc_handler   =       &proc_dointvec,
3277                 },
3278                 {
3279                         .ctl_name       =       NET_IPV6_RTR_SOLICITS,
3280                         .procname       =       "router_solicitations",
3281                         .data           =       &ipv6_devconf.rtr_solicits,
3282                         .maxlen         =       sizeof(int),
3283                         .mode           =       0644,
3284                         .proc_handler   =       &proc_dointvec,
3285                 },
3286                 {
3287                         .ctl_name       =       NET_IPV6_RTR_SOLICIT_INTERVAL,
3288                         .procname       =       "router_solicitation_interval",
3289                         .data           =       &ipv6_devconf.rtr_solicit_interval,
3290                         .maxlen         =       sizeof(int),
3291                         .mode           =       0644,
3292                         .proc_handler   =       &proc_dointvec_jiffies,
3293                         .strategy       =       &sysctl_jiffies,
3294                 },
3295                 {
3296                         .ctl_name       =       NET_IPV6_RTR_SOLICIT_DELAY,
3297                         .procname       =       "router_solicitation_delay",
3298                         .data           =       &ipv6_devconf.rtr_solicit_delay,
3299                         .maxlen         =       sizeof(int),
3300                         .mode           =       0644,
3301                         .proc_handler   =       &proc_dointvec_jiffies,
3302                         .strategy       =       &sysctl_jiffies,
3303                 },
3304                 {
3305                         .ctl_name       =       NET_IPV6_FORCE_MLD_VERSION,
3306                         .procname       =       "force_mld_version",
3307                         .data           =       &ipv6_devconf.force_mld_version,
3308                         .maxlen         =       sizeof(int),
3309                         .mode           =       0644,
3310                         .proc_handler   =       &proc_dointvec,
3311                 },
3312 #ifdef CONFIG_IPV6_PRIVACY
3313                 {
3314                         .ctl_name       =       NET_IPV6_USE_TEMPADDR,
3315                         .procname       =       "use_tempaddr",
3316                         .data           =       &ipv6_devconf.use_tempaddr,
3317                         .maxlen         =       sizeof(int),
3318                         .mode           =       0644,
3319                         .proc_handler   =       &proc_dointvec,
3320                 },
3321                 {
3322                         .ctl_name       =       NET_IPV6_TEMP_VALID_LFT,
3323                         .procname       =       "temp_valid_lft",
3324                         .data           =       &ipv6_devconf.temp_valid_lft,
3325                         .maxlen         =       sizeof(int),
3326                         .mode           =       0644,
3327                         .proc_handler   =       &proc_dointvec,
3328                 },
3329                 {
3330                         .ctl_name       =       NET_IPV6_TEMP_PREFERED_LFT,
3331                         .procname       =       "temp_prefered_lft",
3332                         .data           =       &ipv6_devconf.temp_prefered_lft,
3333                         .maxlen         =       sizeof(int),
3334                         .mode           =       0644,
3335                         .proc_handler   =       &proc_dointvec,
3336                 },
3337                 {
3338                         .ctl_name       =       NET_IPV6_REGEN_MAX_RETRY,
3339                         .procname       =       "regen_max_retry",
3340                         .data           =       &ipv6_devconf.regen_max_retry,
3341                         .maxlen         =       sizeof(int),
3342                         .mode           =       0644,
3343                         .proc_handler   =       &proc_dointvec,
3344                 },
3345                 {
3346                         .ctl_name       =       NET_IPV6_MAX_DESYNC_FACTOR,
3347                         .procname       =       "max_desync_factor",
3348                         .data           =       &ipv6_devconf.max_desync_factor,
3349                         .maxlen         =       sizeof(int),
3350                         .mode           =       0644,
3351                         .proc_handler   =       &proc_dointvec,
3352                 },
3353 #endif
3354                 {
3355                         .ctl_name       =       NET_IPV6_MAX_ADDRESSES,
3356                         .procname       =       "max_addresses",
3357                         .data           =       &ipv6_devconf.max_addresses,
3358                         .maxlen         =       sizeof(int),
3359                         .mode           =       0644,
3360                         .proc_handler   =       &proc_dointvec,
3361                 },
3362                 {
3363                         .ctl_name       =       0,      /* sentinel */
3364                 }
3365         },
3366         .addrconf_dev = {
3367                 {
3368                         .ctl_name       =       NET_PROTO_CONF_ALL,
3369                         .procname       =       "all",
3370                         .mode           =       0555,
3371                         .child          =       addrconf_sysctl.addrconf_vars,
3372                 },
3373                 {
3374                         .ctl_name       =       0,      /* sentinel */
3375                 }
3376         },
3377         .addrconf_conf_dir = {
3378                 {
3379                         .ctl_name       =       NET_IPV6_CONF,
3380                         .procname       =       "conf",
3381                         .mode           =       0555,
3382                         .child          =       addrconf_sysctl.addrconf_dev,
3383                 },
3384                 {
3385                         .ctl_name       =       0,      /* sentinel */
3386                 }
3387         },
3388         .addrconf_proto_dir = {
3389                 {
3390                         .ctl_name       =       NET_IPV6,
3391                         .procname       =       "ipv6",
3392                         .mode           =       0555,
3393                         .child          =       addrconf_sysctl.addrconf_conf_dir,
3394                 },
3395                 {
3396                         .ctl_name       =       0,      /* sentinel */
3397                 }
3398         },
3399         .addrconf_root_dir = {
3400                 {
3401                         .ctl_name       =       CTL_NET,
3402                         .procname       =       "net",
3403                         .mode           =       0555,
3404                         .child          =       addrconf_sysctl.addrconf_proto_dir,
3405                 },
3406                 {
3407                         .ctl_name       =       0,      /* sentinel */
3408                 }
3409         },
3410 };
3411
3412 static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p)
3413 {
3414         int i;
3415         struct net_device *dev = idev ? idev->dev : NULL;
3416         struct addrconf_sysctl_table *t;
3417         char *dev_name = NULL;
3418
3419         t = kmalloc(sizeof(*t), GFP_KERNEL);
3420         if (t == NULL)
3421                 return;
3422         memcpy(t, &addrconf_sysctl, sizeof(*t));
3423         for (i=0; t->addrconf_vars[i].data; i++) {
3424                 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
3425                 t->addrconf_vars[i].de = NULL;
3426                 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
3427         }
3428         if (dev) {
3429                 dev_name = dev->name; 
3430                 t->addrconf_dev[0].ctl_name = dev->ifindex;
3431         } else {
3432                 dev_name = "default";
3433                 t->addrconf_dev[0].ctl_name = NET_PROTO_CONF_DEFAULT;
3434         }
3435
3436         /* 
3437          * Make a copy of dev_name, because '.procname' is regarded as const 
3438          * by sysctl and we wouldn't want anyone to change it under our feet
3439          * (see SIOCSIFNAME).
3440          */     
3441         dev_name = kstrdup(dev_name, GFP_KERNEL);
3442         if (!dev_name)
3443             goto free;
3444
3445         t->addrconf_dev[0].procname = dev_name;
3446
3447         t->addrconf_dev[0].child = t->addrconf_vars;
3448         t->addrconf_dev[0].de = NULL;
3449         t->addrconf_conf_dir[0].child = t->addrconf_dev;
3450         t->addrconf_conf_dir[0].de = NULL;
3451         t->addrconf_proto_dir[0].child = t->addrconf_conf_dir;
3452         t->addrconf_proto_dir[0].de = NULL;
3453         t->addrconf_root_dir[0].child = t->addrconf_proto_dir;
3454         t->addrconf_root_dir[0].de = NULL;
3455
3456         t->sysctl_header = register_sysctl_table(t->addrconf_root_dir, 0);
3457         if (t->sysctl_header == NULL)
3458                 goto free_procname;
3459         else
3460                 p->sysctl = t;
3461         return;
3462
3463         /* error path */
3464  free_procname:
3465         kfree(dev_name);
3466  free:
3467         kfree(t);
3468
3469         return;
3470 }
3471
3472 static void addrconf_sysctl_unregister(struct ipv6_devconf *p)
3473 {
3474         if (p->sysctl) {
3475                 struct addrconf_sysctl_table *t = p->sysctl;
3476                 p->sysctl = NULL;
3477                 unregister_sysctl_table(t->sysctl_header);
3478                 kfree(t->addrconf_dev[0].procname);
3479                 kfree(t);
3480         }
3481 }
3482
3483
3484 #endif
3485
3486 /*
3487  *      Device notifier
3488  */
3489
3490 int register_inet6addr_notifier(struct notifier_block *nb)
3491 {
3492         return notifier_chain_register(&inet6addr_chain, nb);
3493 }
3494
3495 int unregister_inet6addr_notifier(struct notifier_block *nb)
3496 {
3497         return notifier_chain_unregister(&inet6addr_chain,nb);
3498 }
3499
3500 /*
3501  *      Init / cleanup code
3502  */
3503
3504 int __init addrconf_init(void)
3505 {
3506         int err = 0;
3507
3508         /* The addrconf netdev notifier requires that loopback_dev
3509          * has it's ipv6 private information allocated and setup
3510          * before it can bring up and give link-local addresses
3511          * to other devices which are up.
3512          *
3513          * Unfortunately, loopback_dev is not necessarily the first
3514          * entry in the global dev_base list of net devices.  In fact,
3515          * it is likely to be the very last entry on that list.
3516          * So this causes the notifier registry below to try and
3517          * give link-local addresses to all devices besides loopback_dev
3518          * first, then loopback_dev, which cases all the non-loopback_dev
3519          * devices to fail to get a link-local address.
3520          *
3521          * So, as a temporary fix, allocate the ipv6 structure for
3522          * loopback_dev first by hand.
3523          * Longer term, all of the dependencies ipv6 has upon the loopback
3524          * device and it being up should be removed.
3525          */
3526         rtnl_lock();
3527         if (!ipv6_add_dev(&loopback_dev))
3528                 err = -ENOMEM;
3529         rtnl_unlock();
3530         if (err)
3531                 return err;
3532
3533         register_netdevice_notifier(&ipv6_dev_notf);
3534
3535 #ifdef CONFIG_IPV6_PRIVACY
3536         md5_tfm = crypto_alloc_tfm("md5", 0);
3537         if (unlikely(md5_tfm == NULL))
3538                 printk(KERN_WARNING
3539                         "failed to load transform for md5\n");
3540 #endif
3541
3542         addrconf_verify(0);
3543         rtnetlink_links[PF_INET6] = inet6_rtnetlink_table;
3544 #ifdef CONFIG_SYSCTL
3545         addrconf_sysctl.sysctl_header =
3546                 register_sysctl_table(addrconf_sysctl.addrconf_root_dir, 0);
3547         addrconf_sysctl_register(NULL, &ipv6_devconf_dflt);
3548 #endif
3549
3550         return 0;
3551 }
3552
3553 void __exit addrconf_cleanup(void)
3554 {
3555         struct net_device *dev;
3556         struct inet6_dev *idev;
3557         struct inet6_ifaddr *ifa;
3558         int i;
3559
3560         unregister_netdevice_notifier(&ipv6_dev_notf);
3561
3562         rtnetlink_links[PF_INET6] = NULL;
3563 #ifdef CONFIG_SYSCTL
3564         addrconf_sysctl_unregister(&ipv6_devconf_dflt);
3565         addrconf_sysctl_unregister(&ipv6_devconf);
3566 #endif
3567
3568         rtnl_lock();
3569
3570         /*
3571          *      clean dev list.
3572          */
3573
3574         for (dev=dev_base; dev; dev=dev->next) {
3575                 if ((idev = __in6_dev_get(dev)) == NULL)
3576                         continue;
3577                 addrconf_ifdown(dev, 1);
3578         }
3579         addrconf_ifdown(&loopback_dev, 2);
3580
3581         /*
3582          *      Check hash table.
3583          */
3584
3585         write_lock_bh(&addrconf_hash_lock);
3586         for (i=0; i < IN6_ADDR_HSIZE; i++) {
3587                 for (ifa=inet6_addr_lst[i]; ifa; ) {
3588                         struct inet6_ifaddr *bifa;
3589
3590                         bifa = ifa;
3591                         ifa = ifa->lst_next;
3592                         printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
3593                         /* Do not free it; something is wrong.
3594                            Now we can investigate it with debugger.
3595                          */
3596                 }
3597         }
3598         write_unlock_bh(&addrconf_hash_lock);
3599
3600         del_timer(&addr_chk_timer);
3601
3602         rtnl_unlock();
3603
3604 #ifdef CONFIG_IPV6_PRIVACY
3605         if (likely(md5_tfm != NULL)) {
3606                 crypto_free_tfm(md5_tfm);
3607                 md5_tfm = NULL;
3608         }
3609 #endif
3610
3611 #ifdef CONFIG_PROC_FS
3612         proc_net_remove("if_inet6");
3613 #endif
3614 }