Merge git://git.skbuff.net/gitroot/yoshfuji/linux-2.6.14+git+ipv6-fix-20051221a
[linux-2.6.git] / net / ipv6 / addrconf.c
1 /*
2  *      IPv6 Address [auto]configuration
3  *      Linux INET6 implementation
4  *
5  *      Authors:
6  *      Pedro Roque             <roque@di.fc.ul.pt>     
7  *      Alexey Kuznetsov        <kuznet@ms2.inr.ac.ru>
8  *
9  *      $Id: addrconf.c,v 1.69 2001/10/31 21:55:54 davem Exp $
10  *
11  *      This program is free software; you can redistribute it and/or
12  *      modify it under the terms of the GNU General Public License
13  *      as published by the Free Software Foundation; either version
14  *      2 of the License, or (at your option) any later version.
15  */
16
17 /*
18  *      Changes:
19  *
20  *      Janos Farkas                    :       delete timer on ifdown
21  *      <chexum@bankinf.banki.hu>
22  *      Andi Kleen                      :       kill double kfree on module
23  *                                              unload.
24  *      Maciej W. Rozycki               :       FDDI support
25  *      sekiya@USAGI                    :       Don't send too many RS
26  *                                              packets.
27  *      yoshfuji@USAGI                  :       Fixed interval between DAD
28  *                                              packets.
29  *      YOSHIFUJI Hideaki @USAGI        :       improved accuracy of
30  *                                              address validation timer.
31  *      YOSHIFUJI Hideaki @USAGI        :       Privacy Extensions (RFC3041)
32  *                                              support.
33  *      Yuji SEKIYA @USAGI              :       Don't assign a same IPv6
34  *                                              address on a same interface.
35  *      YOSHIFUJI Hideaki @USAGI        :       ARCnet support
36  *      YOSHIFUJI Hideaki @USAGI        :       convert /proc/net/if_inet6 to
37  *                                              seq_file.
38  *      YOSHIFUJI Hideaki @USAGI        :       improved source address
39  *                                              selection; consider scope,
40  *                                              status etc.
41  */
42
43 #include <linux/config.h>
44 #include <linux/errno.h>
45 #include <linux/types.h>
46 #include <linux/socket.h>
47 #include <linux/sockios.h>
48 #include <linux/sched.h>
49 #include <linux/net.h>
50 #include <linux/in6.h>
51 #include <linux/netdevice.h>
52 #include <linux/if_arp.h>
53 #include <linux/if_arcnet.h>
54 #include <linux/if_infiniband.h>
55 #include <linux/route.h>
56 #include <linux/inetdevice.h>
57 #include <linux/init.h>
58 #ifdef CONFIG_SYSCTL
59 #include <linux/sysctl.h>
60 #endif
61 #include <linux/delay.h>
62 #include <linux/notifier.h>
63 #include <linux/string.h>
64
65 #include <net/sock.h>
66 #include <net/snmp.h>
67
68 #include <net/ipv6.h>
69 #include <net/protocol.h>
70 #include <net/ndisc.h>
71 #include <net/ip6_route.h>
72 #include <net/addrconf.h>
73 #include <net/tcp.h>
74 #include <net/ip.h>
75 #include <linux/if_tunnel.h>
76 #include <linux/rtnetlink.h>
77
78 #ifdef CONFIG_IPV6_PRIVACY
79 #include <linux/random.h>
80 #include <linux/crypto.h>
81 #include <linux/scatterlist.h>
82 #endif
83
84 #include <asm/uaccess.h>
85
86 #include <linux/proc_fs.h>
87 #include <linux/seq_file.h>
88
89 /* Set to 3 to get tracing... */
90 #define ACONF_DEBUG 2
91
92 #if ACONF_DEBUG >= 3
93 #define ADBG(x) printk x
94 #else
95 #define ADBG(x)
96 #endif
97
98 #define INFINITY_LIFE_TIME      0xFFFFFFFF
99 #define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b)))
100
101 #ifdef CONFIG_SYSCTL
102 static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p);
103 static void addrconf_sysctl_unregister(struct ipv6_devconf *p);
104 #endif
105
106 #ifdef CONFIG_IPV6_PRIVACY
107 static int __ipv6_regen_rndid(struct inet6_dev *idev);
108 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr); 
109 static void ipv6_regen_rndid(unsigned long data);
110
111 static int desync_factor = MAX_DESYNC_FACTOR * HZ;
112 static struct crypto_tfm *md5_tfm;
113 static DEFINE_SPINLOCK(md5_tfm_lock);
114 #endif
115
116 static int ipv6_count_addresses(struct inet6_dev *idev);
117
118 /*
119  *      Configured unicast address hash table
120  */
121 static struct inet6_ifaddr              *inet6_addr_lst[IN6_ADDR_HSIZE];
122 static DEFINE_RWLOCK(addrconf_hash_lock);
123
124 /* Protects inet6 devices */
125 DEFINE_RWLOCK(addrconf_lock);
126
127 static void addrconf_verify(unsigned long);
128
129 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
130 static DEFINE_SPINLOCK(addrconf_verify_lock);
131
132 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
133 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
134
135 static int addrconf_ifdown(struct net_device *dev, int how);
136
137 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
138 static void addrconf_dad_timer(unsigned long data);
139 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
140 static void addrconf_dad_run(struct inet6_dev *idev);
141 static void addrconf_rs_timer(unsigned long data);
142 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
143 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
144
145 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 
146                                 struct prefix_info *pinfo);
147 static int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev);
148
149 static struct notifier_block *inet6addr_chain;
150
151 struct ipv6_devconf ipv6_devconf = {
152         .forwarding             = 0,
153         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
154         .mtu6                   = IPV6_MIN_MTU,
155         .accept_ra              = 1,
156         .accept_redirects       = 1,
157         .autoconf               = 1,
158         .force_mld_version      = 0,
159         .dad_transmits          = 1,
160         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
161         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
162         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
163 #ifdef CONFIG_IPV6_PRIVACY
164         .use_tempaddr           = 0,
165         .temp_valid_lft         = TEMP_VALID_LIFETIME,
166         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
167         .regen_max_retry        = REGEN_MAX_RETRY,
168         .max_desync_factor      = MAX_DESYNC_FACTOR,
169 #endif
170         .max_addresses          = IPV6_MAX_ADDRESSES,
171 };
172
173 static struct ipv6_devconf ipv6_devconf_dflt = {
174         .forwarding             = 0,
175         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
176         .mtu6                   = IPV6_MIN_MTU,
177         .accept_ra              = 1,
178         .accept_redirects       = 1,
179         .autoconf               = 1,
180         .dad_transmits          = 1,
181         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
182         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
183         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
184 #ifdef CONFIG_IPV6_PRIVACY
185         .use_tempaddr           = 0,
186         .temp_valid_lft         = TEMP_VALID_LIFETIME,
187         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
188         .regen_max_retry        = REGEN_MAX_RETRY,
189         .max_desync_factor      = MAX_DESYNC_FACTOR,
190 #endif
191         .max_addresses          = IPV6_MAX_ADDRESSES,
192 };
193
194 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
195 #if 0
196 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
197 #endif
198 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
199
200 #define IPV6_ADDR_SCOPE_TYPE(scope)     ((scope) << 16)
201
202 static inline unsigned ipv6_addr_scope2type(unsigned scope)
203 {
204         switch(scope) {
205         case IPV6_ADDR_SCOPE_NODELOCAL:
206                 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_NODELOCAL) |
207                         IPV6_ADDR_LOOPBACK);
208         case IPV6_ADDR_SCOPE_LINKLOCAL:
209                 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL) |
210                         IPV6_ADDR_LINKLOCAL);
211         case IPV6_ADDR_SCOPE_SITELOCAL:
212                 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_SITELOCAL) |
213                         IPV6_ADDR_SITELOCAL);
214         }
215         return IPV6_ADDR_SCOPE_TYPE(scope);
216 }
217
218 int __ipv6_addr_type(const struct in6_addr *addr)
219 {
220         u32 st;
221
222         st = addr->s6_addr32[0];
223
224         /* Consider all addresses with the first three bits different of
225            000 and 111 as unicasts.
226          */
227         if ((st & htonl(0xE0000000)) != htonl(0x00000000) &&
228             (st & htonl(0xE0000000)) != htonl(0xE0000000))
229                 return (IPV6_ADDR_UNICAST | 
230                         IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));
231
232         if ((st & htonl(0xFF000000)) == htonl(0xFF000000)) {
233                 /* multicast */
234                 /* addr-select 3.1 */
235                 return (IPV6_ADDR_MULTICAST |
236                         ipv6_addr_scope2type(IPV6_ADDR_MC_SCOPE(addr)));
237         }
238
239         if ((st & htonl(0xFFC00000)) == htonl(0xFE800000))
240                 return (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_UNICAST | 
241                         IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL));               /* addr-select 3.1 */
242         if ((st & htonl(0xFFC00000)) == htonl(0xFEC00000))
243                 return (IPV6_ADDR_SITELOCAL | IPV6_ADDR_UNICAST |
244                         IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_SITELOCAL));               /* addr-select 3.1 */
245
246         if ((addr->s6_addr32[0] | addr->s6_addr32[1]) == 0) {
247                 if (addr->s6_addr32[2] == 0) {
248                         if (addr->s6_addr32[3] == 0)
249                                 return IPV6_ADDR_ANY;
250
251                         if (addr->s6_addr32[3] == htonl(0x00000001))
252                                 return (IPV6_ADDR_LOOPBACK | IPV6_ADDR_UNICAST |
253                                         IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL));       /* addr-select 3.4 */
254
255                         return (IPV6_ADDR_COMPATv4 | IPV6_ADDR_UNICAST |
256                                 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));  /* addr-select 3.3 */
257                 }
258
259                 if (addr->s6_addr32[2] == htonl(0x0000ffff))
260                         return (IPV6_ADDR_MAPPED | 
261                                 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));  /* addr-select 3.3 */
262         }
263
264         return (IPV6_ADDR_RESERVED | 
265                 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));  /* addr-select 3.4 */
266 }
267
268 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
269 {
270         if (del_timer(&ifp->timer))
271                 __in6_ifa_put(ifp);
272 }
273
274 enum addrconf_timer_t
275 {
276         AC_NONE,
277         AC_DAD,
278         AC_RS,
279 };
280
281 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
282                                enum addrconf_timer_t what,
283                                unsigned long when)
284 {
285         if (!del_timer(&ifp->timer))
286                 in6_ifa_hold(ifp);
287
288         switch (what) {
289         case AC_DAD:
290                 ifp->timer.function = addrconf_dad_timer;
291                 break;
292         case AC_RS:
293                 ifp->timer.function = addrconf_rs_timer;
294                 break;
295         default:;
296         }
297         ifp->timer.expires = jiffies + when;
298         add_timer(&ifp->timer);
299 }
300
301 /* Nobody refers to this device, we may destroy it. */
302
303 void in6_dev_finish_destroy(struct inet6_dev *idev)
304 {
305         struct net_device *dev = idev->dev;
306         BUG_TRAP(idev->addr_list==NULL);
307         BUG_TRAP(idev->mc_list==NULL);
308 #ifdef NET_REFCNT_DEBUG
309         printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
310 #endif
311         dev_put(dev);
312         if (!idev->dead) {
313                 printk("Freeing alive inet6 device %p\n", idev);
314                 return;
315         }
316         snmp6_free_dev(idev);
317         kfree(idev);
318 }
319
320 static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
321 {
322         struct inet6_dev *ndev;
323
324         ASSERT_RTNL();
325
326         if (dev->mtu < IPV6_MIN_MTU)
327                 return NULL;
328
329         ndev = kmalloc(sizeof(struct inet6_dev), GFP_KERNEL);
330
331         if (ndev) {
332                 memset(ndev, 0, sizeof(struct inet6_dev));
333
334                 rwlock_init(&ndev->lock);
335                 ndev->dev = dev;
336                 memcpy(&ndev->cnf, &ipv6_devconf_dflt, sizeof(ndev->cnf));
337                 ndev->cnf.mtu6 = dev->mtu;
338                 ndev->cnf.sysctl = NULL;
339                 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
340                 if (ndev->nd_parms == NULL) {
341                         kfree(ndev);
342                         return NULL;
343                 }
344                 /* We refer to the device */
345                 dev_hold(dev);
346
347                 if (snmp6_alloc_dev(ndev) < 0) {
348                         ADBG((KERN_WARNING
349                                 "%s(): cannot allocate memory for statistics; dev=%s.\n",
350                                 __FUNCTION__, dev->name));
351                         neigh_parms_release(&nd_tbl, ndev->nd_parms);
352                         ndev->dead = 1;
353                         in6_dev_finish_destroy(ndev);
354                         return NULL;
355                 }
356
357                 if (snmp6_register_dev(ndev) < 0) {
358                         ADBG((KERN_WARNING
359                                 "%s(): cannot create /proc/net/dev_snmp6/%s\n",
360                                 __FUNCTION__, dev->name));
361                         neigh_parms_release(&nd_tbl, ndev->nd_parms);
362                         ndev->dead = 1;
363                         in6_dev_finish_destroy(ndev);
364                         return NULL;
365                 }
366
367                 /* One reference from device.  We must do this before
368                  * we invoke __ipv6_regen_rndid().
369                  */
370                 in6_dev_hold(ndev);
371
372 #ifdef CONFIG_IPV6_PRIVACY
373                 get_random_bytes(ndev->rndid, sizeof(ndev->rndid));
374                 get_random_bytes(ndev->entropy, sizeof(ndev->entropy));
375                 init_timer(&ndev->regen_timer);
376                 ndev->regen_timer.function = ipv6_regen_rndid;
377                 ndev->regen_timer.data = (unsigned long) ndev;
378                 if ((dev->flags&IFF_LOOPBACK) ||
379                     dev->type == ARPHRD_TUNNEL ||
380                     dev->type == ARPHRD_NONE ||
381                     dev->type == ARPHRD_SIT) {
382                         printk(KERN_INFO
383                                "%s: Disabled Privacy Extensions\n",
384                                dev->name);
385                         ndev->cnf.use_tempaddr = -1;
386                 } else {
387                         in6_dev_hold(ndev);
388                         ipv6_regen_rndid((unsigned long) ndev);
389                 }
390 #endif
391
392                 if (netif_carrier_ok(dev))
393                         ndev->if_flags |= IF_READY;
394
395                 write_lock_bh(&addrconf_lock);
396                 dev->ip6_ptr = ndev;
397                 write_unlock_bh(&addrconf_lock);
398
399                 ipv6_mc_init_dev(ndev);
400                 ndev->tstamp = jiffies;
401 #ifdef CONFIG_SYSCTL
402                 neigh_sysctl_register(dev, ndev->nd_parms, NET_IPV6, 
403                                       NET_IPV6_NEIGH, "ipv6",
404                                       &ndisc_ifinfo_sysctl_change,
405                                       NULL);
406                 addrconf_sysctl_register(ndev, &ndev->cnf);
407 #endif
408         }
409         return ndev;
410 }
411
412 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
413 {
414         struct inet6_dev *idev;
415
416         ASSERT_RTNL();
417
418         if ((idev = __in6_dev_get(dev)) == NULL) {
419                 if ((idev = ipv6_add_dev(dev)) == NULL)
420                         return NULL;
421         }
422
423         if (dev->flags&IFF_UP)
424                 ipv6_mc_up(idev);
425         return idev;
426 }
427
428 #ifdef CONFIG_SYSCTL
429 static void dev_forward_change(struct inet6_dev *idev)
430 {
431         struct net_device *dev;
432         struct inet6_ifaddr *ifa;
433         struct in6_addr addr;
434
435         if (!idev)
436                 return;
437         dev = idev->dev;
438         if (dev && (dev->flags & IFF_MULTICAST)) {
439                 ipv6_addr_all_routers(&addr);
440         
441                 if (idev->cnf.forwarding)
442                         ipv6_dev_mc_inc(dev, &addr);
443                 else
444                         ipv6_dev_mc_dec(dev, &addr);
445         }
446         for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
447                 if (idev->cnf.forwarding)
448                         addrconf_join_anycast(ifa);
449                 else
450                         addrconf_leave_anycast(ifa);
451         }
452 }
453
454
455 static void addrconf_forward_change(void)
456 {
457         struct net_device *dev;
458         struct inet6_dev *idev;
459
460         read_lock(&dev_base_lock);
461         for (dev=dev_base; dev; dev=dev->next) {
462                 read_lock(&addrconf_lock);
463                 idev = __in6_dev_get(dev);
464                 if (idev) {
465                         int changed = (!idev->cnf.forwarding) ^ (!ipv6_devconf.forwarding);
466                         idev->cnf.forwarding = ipv6_devconf.forwarding;
467                         if (changed)
468                                 dev_forward_change(idev);
469                 }
470                 read_unlock(&addrconf_lock);
471         }
472         read_unlock(&dev_base_lock);
473 }
474 #endif
475
476 /* Nobody refers to this ifaddr, destroy it */
477
478 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
479 {
480         BUG_TRAP(ifp->if_next==NULL);
481         BUG_TRAP(ifp->lst_next==NULL);
482 #ifdef NET_REFCNT_DEBUG
483         printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
484 #endif
485
486         in6_dev_put(ifp->idev);
487
488         if (del_timer(&ifp->timer))
489                 printk("Timer is still running, when freeing ifa=%p\n", ifp);
490
491         if (!ifp->dead) {
492                 printk("Freeing alive inet6 address %p\n", ifp);
493                 return;
494         }
495         dst_release(&ifp->rt->u.dst);
496
497         kfree(ifp);
498 }
499
500 /* On success it returns ifp with increased reference count */
501
502 static struct inet6_ifaddr *
503 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
504               int scope, u32 flags)
505 {
506         struct inet6_ifaddr *ifa = NULL;
507         struct rt6_info *rt;
508         int hash;
509         int err = 0;
510
511         read_lock_bh(&addrconf_lock);
512         if (idev->dead) {
513                 err = -ENODEV;                  /*XXX*/
514                 goto out2;
515         }
516
517         write_lock(&addrconf_hash_lock);
518
519         /* Ignore adding duplicate addresses on an interface */
520         if (ipv6_chk_same_addr(addr, idev->dev)) {
521                 ADBG(("ipv6_add_addr: already assigned\n"));
522                 err = -EEXIST;
523                 goto out;
524         }
525
526         ifa = kmalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
527
528         if (ifa == NULL) {
529                 ADBG(("ipv6_add_addr: malloc failed\n"));
530                 err = -ENOBUFS;
531                 goto out;
532         }
533
534         rt = addrconf_dst_alloc(idev, addr, 0);
535         if (IS_ERR(rt)) {
536                 err = PTR_ERR(rt);
537                 goto out;
538         }
539
540         memset(ifa, 0, sizeof(struct inet6_ifaddr));
541         ipv6_addr_copy(&ifa->addr, addr);
542
543         spin_lock_init(&ifa->lock);
544         init_timer(&ifa->timer);
545         ifa->timer.data = (unsigned long) ifa;
546         ifa->scope = scope;
547         ifa->prefix_len = pfxlen;
548         ifa->flags = flags | IFA_F_TENTATIVE;
549         ifa->cstamp = ifa->tstamp = jiffies;
550
551         ifa->idev = idev;
552         in6_dev_hold(idev);
553         /* For caller */
554         in6_ifa_hold(ifa);
555
556         /* Add to big hash table */
557         hash = ipv6_addr_hash(addr);
558
559         ifa->lst_next = inet6_addr_lst[hash];
560         inet6_addr_lst[hash] = ifa;
561         in6_ifa_hold(ifa);
562         write_unlock(&addrconf_hash_lock);
563
564         write_lock(&idev->lock);
565         /* Add to inet6_dev unicast addr list. */
566         ifa->if_next = idev->addr_list;
567         idev->addr_list = ifa;
568
569 #ifdef CONFIG_IPV6_PRIVACY
570         if (ifa->flags&IFA_F_TEMPORARY) {
571                 ifa->tmp_next = idev->tempaddr_list;
572                 idev->tempaddr_list = ifa;
573                 in6_ifa_hold(ifa);
574         }
575 #endif
576
577         ifa->rt = rt;
578
579         in6_ifa_hold(ifa);
580         write_unlock(&idev->lock);
581 out2:
582         read_unlock_bh(&addrconf_lock);
583
584         if (likely(err == 0))
585                 notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
586         else {
587                 kfree(ifa);
588                 ifa = ERR_PTR(err);
589         }
590
591         return ifa;
592 out:
593         write_unlock(&addrconf_hash_lock);
594         goto out2;
595 }
596
597 /* This function wants to get referenced ifp and releases it before return */
598
599 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
600 {
601         struct inet6_ifaddr *ifa, **ifap;
602         struct inet6_dev *idev = ifp->idev;
603         int hash;
604         int deleted = 0, onlink = 0;
605         unsigned long expires = jiffies;
606
607         hash = ipv6_addr_hash(&ifp->addr);
608
609         ifp->dead = 1;
610
611         write_lock_bh(&addrconf_hash_lock);
612         for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
613              ifap = &ifa->lst_next) {
614                 if (ifa == ifp) {
615                         *ifap = ifa->lst_next;
616                         __in6_ifa_put(ifp);
617                         ifa->lst_next = NULL;
618                         break;
619                 }
620         }
621         write_unlock_bh(&addrconf_hash_lock);
622
623         write_lock_bh(&idev->lock);
624 #ifdef CONFIG_IPV6_PRIVACY
625         if (ifp->flags&IFA_F_TEMPORARY) {
626                 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
627                      ifap = &ifa->tmp_next) {
628                         if (ifa == ifp) {
629                                 *ifap = ifa->tmp_next;
630                                 if (ifp->ifpub) {
631                                         in6_ifa_put(ifp->ifpub);
632                                         ifp->ifpub = NULL;
633                                 }
634                                 __in6_ifa_put(ifp);
635                                 ifa->tmp_next = NULL;
636                                 break;
637                         }
638                 }
639         }
640 #endif
641
642         for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
643                 if (ifa == ifp) {
644                         *ifap = ifa->if_next;
645                         __in6_ifa_put(ifp);
646                         ifa->if_next = NULL;
647                         if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
648                                 break;
649                         deleted = 1;
650                         continue;
651                 } else if (ifp->flags & IFA_F_PERMANENT) {
652                         if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
653                                               ifp->prefix_len)) {
654                                 if (ifa->flags & IFA_F_PERMANENT) {
655                                         onlink = 1;
656                                         if (deleted)
657                                                 break;
658                                 } else {
659                                         unsigned long lifetime;
660
661                                         if (!onlink)
662                                                 onlink = -1;
663
664                                         spin_lock(&ifa->lock);
665                                         lifetime = min_t(unsigned long,
666                                                          ifa->valid_lft, 0x7fffffffUL/HZ);
667                                         if (time_before(expires,
668                                                         ifa->tstamp + lifetime * HZ))
669                                                 expires = ifa->tstamp + lifetime * HZ;
670                                         spin_unlock(&ifa->lock);
671                                 }
672                         }
673                 }
674                 ifap = &ifa->if_next;
675         }
676         write_unlock_bh(&idev->lock);
677
678         ipv6_ifa_notify(RTM_DELADDR, ifp);
679
680         notifier_call_chain(&inet6addr_chain,NETDEV_DOWN,ifp);
681
682         addrconf_del_timer(ifp);
683
684         /*
685          * Purge or update corresponding prefix
686          *
687          * 1) we don't purge prefix here if address was not permanent.
688          *    prefix is managed by its own lifetime.
689          * 2) if there're no addresses, delete prefix.
690          * 3) if there're still other permanent address(es),
691          *    corresponding prefix is still permanent.
692          * 4) otherwise, update prefix lifetime to the
693          *    longest valid lifetime among the corresponding
694          *    addresses on the device.
695          *    Note: subsequent RA will update lifetime.
696          *
697          * --yoshfuji
698          */
699         if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
700                 struct in6_addr prefix;
701                 struct rt6_info *rt;
702
703                 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
704                 rt = rt6_lookup(&prefix, NULL, ifp->idev->dev->ifindex, 1);
705
706                 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
707                         if (onlink == 0) {
708                                 ip6_del_rt(rt, NULL, NULL, NULL);
709                                 rt = NULL;
710                         } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
711                                 rt->rt6i_expires = expires;
712                                 rt->rt6i_flags |= RTF_EXPIRES;
713                         }
714                 }
715                 dst_release(&rt->u.dst);
716         }
717
718         in6_ifa_put(ifp);
719 }
720
721 #ifdef CONFIG_IPV6_PRIVACY
722 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
723 {
724         struct inet6_dev *idev = ifp->idev;
725         struct in6_addr addr, *tmpaddr;
726         unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
727         int tmp_plen;
728         int ret = 0;
729         int max_addresses;
730
731         write_lock(&idev->lock);
732         if (ift) {
733                 spin_lock_bh(&ift->lock);
734                 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
735                 spin_unlock_bh(&ift->lock);
736                 tmpaddr = &addr;
737         } else {
738                 tmpaddr = NULL;
739         }
740 retry:
741         in6_dev_hold(idev);
742         if (idev->cnf.use_tempaddr <= 0) {
743                 write_unlock(&idev->lock);
744                 printk(KERN_INFO
745                         "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
746                 in6_dev_put(idev);
747                 ret = -1;
748                 goto out;
749         }
750         spin_lock_bh(&ifp->lock);
751         if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
752                 idev->cnf.use_tempaddr = -1;    /*XXX*/
753                 spin_unlock_bh(&ifp->lock);
754                 write_unlock(&idev->lock);
755                 printk(KERN_WARNING
756                         "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
757                 in6_dev_put(idev);
758                 ret = -1;
759                 goto out;
760         }
761         in6_ifa_hold(ifp);
762         memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
763         if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
764                 spin_unlock_bh(&ifp->lock);
765                 write_unlock(&idev->lock);
766                 printk(KERN_WARNING
767                         "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
768                 in6_ifa_put(ifp);
769                 in6_dev_put(idev);
770                 ret = -1;
771                 goto out;
772         }
773         memcpy(&addr.s6_addr[8], idev->rndid, 8);
774         tmp_valid_lft = min_t(__u32,
775                               ifp->valid_lft,
776                               idev->cnf.temp_valid_lft);
777         tmp_prefered_lft = min_t(__u32, 
778                                  ifp->prefered_lft, 
779                                  idev->cnf.temp_prefered_lft - desync_factor / HZ);
780         tmp_plen = ifp->prefix_len;
781         max_addresses = idev->cnf.max_addresses;
782         tmp_cstamp = ifp->cstamp;
783         tmp_tstamp = ifp->tstamp;
784         spin_unlock_bh(&ifp->lock);
785
786         write_unlock(&idev->lock);
787         ift = !max_addresses ||
788               ipv6_count_addresses(idev) < max_addresses ? 
789                 ipv6_add_addr(idev, &addr, tmp_plen,
790                               ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK, IFA_F_TEMPORARY) : NULL;
791         if (!ift || IS_ERR(ift)) {
792                 in6_ifa_put(ifp);
793                 in6_dev_put(idev);
794                 printk(KERN_INFO
795                         "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
796                 tmpaddr = &addr;
797                 write_lock(&idev->lock);
798                 goto retry;
799         }
800
801         spin_lock_bh(&ift->lock);
802         ift->ifpub = ifp;
803         ift->valid_lft = tmp_valid_lft;
804         ift->prefered_lft = tmp_prefered_lft;
805         ift->cstamp = tmp_cstamp;
806         ift->tstamp = tmp_tstamp;
807         spin_unlock_bh(&ift->lock);
808
809         addrconf_dad_start(ift, 0);
810         in6_ifa_put(ift);
811         in6_dev_put(idev);
812 out:
813         return ret;
814 }
815 #endif
816
817 /*
818  *      Choose an appropriate source address (RFC3484)
819  */
820 struct ipv6_saddr_score {
821         int             addr_type;
822         unsigned int    attrs;
823         int             matchlen;
824         unsigned int    scope;
825         unsigned int    rule;
826 };
827
828 #define IPV6_SADDR_SCORE_LOCAL          0x0001
829 #define IPV6_SADDR_SCORE_PREFERRED      0x0004
830 #define IPV6_SADDR_SCORE_HOA            0x0008
831 #define IPV6_SADDR_SCORE_OIF            0x0010
832 #define IPV6_SADDR_SCORE_LABEL          0x0020
833 #define IPV6_SADDR_SCORE_PRIVACY        0x0040
834
835 static int inline ipv6_saddr_preferred(int type)
836 {
837         if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
838                     IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
839                 return 1;
840         return 0;
841 }
842
843 /* static matching label */
844 static int inline ipv6_saddr_label(const struct in6_addr *addr, int type)
845 {
846  /*
847   *     prefix (longest match)  label
848   *     -----------------------------
849   *     ::1/128                 0
850   *     ::/0                    1
851   *     2002::/16               2
852   *     ::/96                   3
853   *     ::ffff:0:0/96           4
854   */
855         if (type & IPV6_ADDR_LOOPBACK)
856                 return 0;
857         else if (type & IPV6_ADDR_COMPATv4)
858                 return 3;
859         else if (type & IPV6_ADDR_MAPPED)
860                 return 4;
861         else if (addr->s6_addr16[0] == htons(0x2002))
862                 return 2;
863         return 1;
864 }
865
866 int ipv6_dev_get_saddr(struct net_device *daddr_dev,
867                        struct in6_addr *daddr, struct in6_addr *saddr)
868 {
869         struct ipv6_saddr_score hiscore;
870         struct inet6_ifaddr *ifa_result = NULL;
871         int daddr_type = __ipv6_addr_type(daddr);
872         int daddr_scope = __ipv6_addr_src_scope(daddr_type);
873         u32 daddr_label = ipv6_saddr_label(daddr, daddr_type);
874         struct net_device *dev;
875
876         memset(&hiscore, 0, sizeof(hiscore));
877
878         read_lock(&dev_base_lock);
879         read_lock(&addrconf_lock);
880
881         for (dev = dev_base; dev; dev=dev->next) {
882                 struct inet6_dev *idev;
883                 struct inet6_ifaddr *ifa;
884
885                 /* Rule 0: Candidate Source Address (section 4)
886                  *  - multicast and link-local destination address,
887                  *    the set of candidate source address MUST only
888                  *    include addresses assigned to interfaces
889                  *    belonging to the same link as the outgoing
890                  *    interface.
891                  * (- For site-local destination addresses, the
892                  *    set of candidate source addresses MUST only
893                  *    include addresses assigned to interfaces
894                  *    belonging to the same site as the outgoing
895                  *    interface.)
896                  */
897                 if ((daddr_type & IPV6_ADDR_MULTICAST ||
898                      daddr_scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
899                     daddr_dev && dev != daddr_dev)
900                         continue;
901
902                 idev = __in6_dev_get(dev);
903                 if (!idev)
904                         continue;
905
906                 read_lock_bh(&idev->lock);
907                 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
908                         struct ipv6_saddr_score score;
909
910                         score.addr_type = __ipv6_addr_type(&ifa->addr);
911
912                         /* Rule 0:
913                          * - Tentative Address (RFC2462 section 5.4)
914                          *  - A tentative address is not considered
915                          *    "assigned to an interface" in the traditional
916                          *    sense.
917                          * - Candidate Source Address (section 4)
918                          *  - In any case, anycast addresses, multicast
919                          *    addresses, and the unspecified address MUST
920                          *    NOT be included in a candidate set.
921                          */
922                         if (ifa->flags & IFA_F_TENTATIVE)
923                                 continue;
924                         if (unlikely(score.addr_type == IPV6_ADDR_ANY ||
925                                      score.addr_type & IPV6_ADDR_MULTICAST)) {
926                                 LIMIT_NETDEBUG(KERN_DEBUG
927                                                "ADDRCONF: unspecified / multicast address"
928                                                "assigned as unicast address on %s",
929                                                dev->name);
930                                 continue;
931                         }
932
933                         score.attrs = 0;
934                         score.matchlen = 0;
935                         score.scope = 0;
936                         score.rule = 0;
937
938                         if (ifa_result == NULL) {
939                                 /* record it if the first available entry */
940                                 goto record_it;
941                         }
942
943                         /* Rule 1: Prefer same address */
944                         if (hiscore.rule < 1) {
945                                 if (ipv6_addr_equal(&ifa_result->addr, daddr))
946                                         hiscore.attrs |= IPV6_SADDR_SCORE_LOCAL;
947                                 hiscore.rule++;
948                         }
949                         if (ipv6_addr_equal(&ifa->addr, daddr)) {
950                                 score.attrs |= IPV6_SADDR_SCORE_LOCAL;
951                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)) {
952                                         score.rule = 1;
953                                         goto record_it;
954                                 }
955                         } else {
956                                 if (hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)
957                                         continue;
958                         }
959
960                         /* Rule 2: Prefer appropriate scope */
961                         if (hiscore.rule < 2) {
962                                 hiscore.scope = __ipv6_addr_src_scope(hiscore.addr_type);
963                                 hiscore.rule++;
964                         }
965                         score.scope = __ipv6_addr_src_scope(score.addr_type);
966                         if (hiscore.scope < score.scope) {
967                                 if (hiscore.scope < daddr_scope) {
968                                         score.rule = 2;
969                                         goto record_it;
970                                 } else
971                                         continue;
972                         } else if (score.scope < hiscore.scope) {
973                                 if (score.scope < daddr_scope)
974                                         continue;
975                                 else {
976                                         score.rule = 2;
977                                         goto record_it;
978                                 }
979                         }
980
981                         /* Rule 3: Avoid deprecated address */
982                         if (hiscore.rule < 3) {
983                                 if (ipv6_saddr_preferred(hiscore.addr_type) ||
984                                     !(ifa_result->flags & IFA_F_DEPRECATED))
985                                         hiscore.attrs |= IPV6_SADDR_SCORE_PREFERRED;
986                                 hiscore.rule++;
987                         }
988                         if (ipv6_saddr_preferred(score.addr_type) ||
989                             !(ifa->flags & IFA_F_DEPRECATED)) {
990                                 score.attrs |= IPV6_SADDR_SCORE_PREFERRED;
991                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)) {
992                                         score.rule = 3;
993                                         goto record_it;
994                                 }
995                         } else {
996                                 if (hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)
997                                         continue;
998                         }
999
1000                         /* Rule 4: Prefer home address -- not implemented yet */
1001                         if (hiscore.rule < 4)
1002                                 hiscore.rule++;
1003
1004                         /* Rule 5: Prefer outgoing interface */
1005                         if (hiscore.rule < 5) {
1006                                 if (daddr_dev == NULL ||
1007                                     daddr_dev == ifa_result->idev->dev)
1008                                         hiscore.attrs |= IPV6_SADDR_SCORE_OIF;
1009                                 hiscore.rule++;
1010                         }
1011                         if (daddr_dev == NULL ||
1012                             daddr_dev == ifa->idev->dev) {
1013                                 score.attrs |= IPV6_SADDR_SCORE_OIF;
1014                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_OIF)) {
1015                                         score.rule = 5;
1016                                         goto record_it;
1017                                 }
1018                         } else {
1019                                 if (hiscore.attrs & IPV6_SADDR_SCORE_OIF)
1020                                         continue;
1021                         }
1022
1023                         /* Rule 6: Prefer matching label */
1024                         if (hiscore.rule < 6) {
1025                                 if (ipv6_saddr_label(&ifa_result->addr, hiscore.addr_type) == daddr_label)
1026                                         hiscore.attrs |= IPV6_SADDR_SCORE_LABEL;
1027                                 hiscore.rule++;
1028                         }
1029                         if (ipv6_saddr_label(&ifa->addr, score.addr_type) == daddr_label) {
1030                                 score.attrs |= IPV6_SADDR_SCORE_LABEL;
1031                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LABEL)) {
1032                                         score.rule = 6;
1033                                         goto record_it;
1034                                 }
1035                         } else {
1036                                 if (hiscore.attrs & IPV6_SADDR_SCORE_LABEL)
1037                                         continue;
1038                         }
1039
1040 #ifdef CONFIG_IPV6_PRIVACY
1041                         /* Rule 7: Prefer public address
1042                          * Note: prefer temprary address if use_tempaddr >= 2
1043                          */
1044                         if (hiscore.rule < 7) {
1045                                 if ((!(ifa_result->flags & IFA_F_TEMPORARY)) ^
1046                                     (ifa_result->idev->cnf.use_tempaddr >= 2))
1047                                         hiscore.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1048                                 hiscore.rule++;
1049                         }
1050                         if ((!(ifa->flags & IFA_F_TEMPORARY)) ^
1051                             (ifa->idev->cnf.use_tempaddr >= 2)) {
1052                                 score.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1053                                 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)) {
1054                                         score.rule = 7;
1055                                         goto record_it;
1056                                 }
1057                         } else {
1058                                 if (hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)
1059                                         continue;
1060                         }
1061 #endif
1062                         /* Rule 8: Use longest matching prefix */
1063                         if (hiscore.rule < 8) {
1064                                 hiscore.matchlen = ipv6_addr_diff(&ifa_result->addr, daddr);
1065                                 hiscore.rule++;
1066                         }
1067                         score.matchlen = ipv6_addr_diff(&ifa->addr, daddr);
1068                         if (score.matchlen > hiscore.matchlen) {
1069                                 score.rule = 8;
1070                                 goto record_it;
1071                         }
1072 #if 0
1073                         else if (score.matchlen < hiscore.matchlen)
1074                                 continue;
1075 #endif
1076
1077                         /* Final Rule: choose first available one */
1078                         continue;
1079 record_it:
1080                         if (ifa_result)
1081                                 in6_ifa_put(ifa_result);
1082                         in6_ifa_hold(ifa);
1083                         ifa_result = ifa;
1084                         hiscore = score;
1085                 }
1086                 read_unlock_bh(&idev->lock);
1087         }
1088         read_unlock(&addrconf_lock);
1089         read_unlock(&dev_base_lock);
1090
1091         if (!ifa_result)
1092                 return -EADDRNOTAVAIL;
1093         
1094         ipv6_addr_copy(saddr, &ifa_result->addr);
1095         in6_ifa_put(ifa_result);
1096         return 0;
1097 }
1098
1099
1100 int ipv6_get_saddr(struct dst_entry *dst,
1101                    struct in6_addr *daddr, struct in6_addr *saddr)
1102 {
1103         return ipv6_dev_get_saddr(dst ? ((struct rt6_info *)dst)->rt6i_idev->dev : NULL, daddr, saddr);
1104 }
1105
1106
1107 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr)
1108 {
1109         struct inet6_dev *idev;
1110         int err = -EADDRNOTAVAIL;
1111
1112         read_lock(&addrconf_lock);
1113         if ((idev = __in6_dev_get(dev)) != NULL) {
1114                 struct inet6_ifaddr *ifp;
1115
1116                 read_lock_bh(&idev->lock);
1117                 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1118                         if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1119                                 ipv6_addr_copy(addr, &ifp->addr);
1120                                 err = 0;
1121                                 break;
1122                         }
1123                 }
1124                 read_unlock_bh(&idev->lock);
1125         }
1126         read_unlock(&addrconf_lock);
1127         return err;
1128 }
1129
1130 static int ipv6_count_addresses(struct inet6_dev *idev)
1131 {
1132         int cnt = 0;
1133         struct inet6_ifaddr *ifp;
1134
1135         read_lock_bh(&idev->lock);
1136         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1137                 cnt++;
1138         read_unlock_bh(&idev->lock);
1139         return cnt;
1140 }
1141
1142 int ipv6_chk_addr(struct in6_addr *addr, struct net_device *dev, int strict)
1143 {
1144         struct inet6_ifaddr * ifp;
1145         u8 hash = ipv6_addr_hash(addr);
1146
1147         read_lock_bh(&addrconf_hash_lock);
1148         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1149                 if (ipv6_addr_equal(&ifp->addr, addr) &&
1150                     !(ifp->flags&IFA_F_TENTATIVE)) {
1151                         if (dev == NULL || ifp->idev->dev == dev ||
1152                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1153                                 break;
1154                 }
1155         }
1156         read_unlock_bh(&addrconf_hash_lock);
1157         return ifp != NULL;
1158 }
1159
1160 static
1161 int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev)
1162 {
1163         struct inet6_ifaddr * ifp;
1164         u8 hash = ipv6_addr_hash(addr);
1165
1166         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1167                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1168                         if (dev == NULL || ifp->idev->dev == dev)
1169                                 break;
1170                 }
1171         }
1172         return ifp != NULL;
1173 }
1174
1175 struct inet6_ifaddr * ipv6_get_ifaddr(struct in6_addr *addr, struct net_device *dev, int strict)
1176 {
1177         struct inet6_ifaddr * ifp;
1178         u8 hash = ipv6_addr_hash(addr);
1179
1180         read_lock_bh(&addrconf_hash_lock);
1181         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1182                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1183                         if (dev == NULL || ifp->idev->dev == dev ||
1184                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1185                                 in6_ifa_hold(ifp);
1186                                 break;
1187                         }
1188                 }
1189         }
1190         read_unlock_bh(&addrconf_hash_lock);
1191
1192         return ifp;
1193 }
1194
1195 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1196 {
1197         const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
1198         const struct in6_addr *sk2_rcv_saddr6 = tcp_v6_rcv_saddr(sk2);
1199         u32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
1200         u32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1201         int sk_ipv6only = ipv6_only_sock(sk);
1202         int sk2_ipv6only = inet_v6_ipv6only(sk2);
1203         int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1204         int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1205
1206         if (!sk2_rcv_saddr && !sk_ipv6only)
1207                 return 1;
1208
1209         if (addr_type2 == IPV6_ADDR_ANY &&
1210             !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1211                 return 1;
1212
1213         if (addr_type == IPV6_ADDR_ANY &&
1214             !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1215                 return 1;
1216
1217         if (sk2_rcv_saddr6 &&
1218             ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1219                 return 1;
1220
1221         if (addr_type == IPV6_ADDR_MAPPED &&
1222             !sk2_ipv6only &&
1223             (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1224                 return 1;
1225
1226         return 0;
1227 }
1228
1229 /* Gets referenced address, destroys ifaddr */
1230
1231 void addrconf_dad_stop(struct inet6_ifaddr *ifp)
1232 {
1233         if (ifp->flags&IFA_F_PERMANENT) {
1234                 spin_lock_bh(&ifp->lock);
1235                 addrconf_del_timer(ifp);
1236                 ifp->flags |= IFA_F_TENTATIVE;
1237                 spin_unlock_bh(&ifp->lock);
1238                 in6_ifa_put(ifp);
1239 #ifdef CONFIG_IPV6_PRIVACY
1240         } else if (ifp->flags&IFA_F_TEMPORARY) {
1241                 struct inet6_ifaddr *ifpub;
1242                 spin_lock_bh(&ifp->lock);
1243                 ifpub = ifp->ifpub;
1244                 if (ifpub) {
1245                         in6_ifa_hold(ifpub);
1246                         spin_unlock_bh(&ifp->lock);
1247                         ipv6_create_tempaddr(ifpub, ifp);
1248                         in6_ifa_put(ifpub);
1249                 } else {
1250                         spin_unlock_bh(&ifp->lock);
1251                 }
1252                 ipv6_del_addr(ifp);
1253 #endif
1254         } else
1255                 ipv6_del_addr(ifp);
1256 }
1257
1258 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1259 {
1260         if (net_ratelimit())
1261                 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1262         addrconf_dad_stop(ifp);
1263 }
1264
1265 /* Join to solicited addr multicast group. */
1266
1267 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1268 {
1269         struct in6_addr maddr;
1270
1271         if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1272                 return;
1273
1274         addrconf_addr_solict_mult(addr, &maddr);
1275         ipv6_dev_mc_inc(dev, &maddr);
1276 }
1277
1278 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1279 {
1280         struct in6_addr maddr;
1281
1282         if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1283                 return;
1284
1285         addrconf_addr_solict_mult(addr, &maddr);
1286         __ipv6_dev_mc_dec(idev, &maddr);
1287 }
1288
1289 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1290 {
1291         struct in6_addr addr;
1292         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1293         if (ipv6_addr_any(&addr))
1294                 return;
1295         ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1296 }
1297
1298 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1299 {
1300         struct in6_addr addr;
1301         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1302         if (ipv6_addr_any(&addr))
1303                 return;
1304         __ipv6_dev_ac_dec(ifp->idev, &addr);
1305 }
1306
1307 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1308 {
1309         switch (dev->type) {
1310         case ARPHRD_ETHER:
1311         case ARPHRD_FDDI:
1312         case ARPHRD_IEEE802_TR:
1313                 if (dev->addr_len != ETH_ALEN)
1314                         return -1;
1315                 memcpy(eui, dev->dev_addr, 3);
1316                 memcpy(eui + 5, dev->dev_addr + 3, 3);
1317
1318                 /*
1319                  * The zSeries OSA network cards can be shared among various
1320                  * OS instances, but the OSA cards have only one MAC address.
1321                  * This leads to duplicate address conflicts in conjunction
1322                  * with IPv6 if more than one instance uses the same card.
1323                  * 
1324                  * The driver for these cards can deliver a unique 16-bit
1325                  * identifier for each instance sharing the same card.  It is
1326                  * placed instead of 0xFFFE in the interface identifier.  The
1327                  * "u" bit of the interface identifier is not inverted in this
1328                  * case.  Hence the resulting interface identifier has local
1329                  * scope according to RFC2373.
1330                  */
1331                 if (dev->dev_id) {
1332                         eui[3] = (dev->dev_id >> 8) & 0xFF;
1333                         eui[4] = dev->dev_id & 0xFF;
1334                 } else {
1335                         eui[3] = 0xFF;
1336                         eui[4] = 0xFE;
1337                         eui[0] ^= 2;
1338                 }
1339                 return 0;
1340         case ARPHRD_ARCNET:
1341                 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1342                 if (dev->addr_len != ARCNET_ALEN)
1343                         return -1;
1344                 memset(eui, 0, 7);
1345                 eui[7] = *(u8*)dev->dev_addr;
1346                 return 0;
1347         case ARPHRD_INFINIBAND:
1348                 if (dev->addr_len != INFINIBAND_ALEN)
1349                         return -1;
1350                 memcpy(eui, dev->dev_addr + 12, 8);
1351                 eui[0] |= 2;
1352                 return 0;
1353         }
1354         return -1;
1355 }
1356
1357 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1358 {
1359         int err = -1;
1360         struct inet6_ifaddr *ifp;
1361
1362         read_lock_bh(&idev->lock);
1363         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1364                 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1365                         memcpy(eui, ifp->addr.s6_addr+8, 8);
1366                         err = 0;
1367                         break;
1368                 }
1369         }
1370         read_unlock_bh(&idev->lock);
1371         return err;
1372 }
1373
1374 #ifdef CONFIG_IPV6_PRIVACY
1375 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1376 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1377 {
1378         struct net_device *dev;
1379         struct scatterlist sg[2];
1380
1381         sg_set_buf(&sg[0], idev->entropy, 8);
1382         sg_set_buf(&sg[1], idev->work_eui64, 8);
1383
1384         dev = idev->dev;
1385
1386         if (ipv6_generate_eui64(idev->work_eui64, dev)) {
1387                 printk(KERN_INFO
1388                         "__ipv6_regen_rndid(idev=%p): cannot get EUI64 identifier; use random bytes.\n",
1389                         idev);
1390                 get_random_bytes(idev->work_eui64, sizeof(idev->work_eui64));
1391         }
1392 regen:
1393         spin_lock(&md5_tfm_lock);
1394         if (unlikely(md5_tfm == NULL)) {
1395                 spin_unlock(&md5_tfm_lock);
1396                 return -1;
1397         }
1398         crypto_digest_init(md5_tfm);
1399         crypto_digest_update(md5_tfm, sg, 2);
1400         crypto_digest_final(md5_tfm, idev->work_digest);
1401         spin_unlock(&md5_tfm_lock);
1402
1403         memcpy(idev->rndid, &idev->work_digest[0], 8);
1404         idev->rndid[0] &= ~0x02;
1405         memcpy(idev->entropy, &idev->work_digest[8], 8);
1406
1407         /*
1408          * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1409          * check if generated address is not inappropriate
1410          *
1411          *  - Reserved subnet anycast (RFC 2526)
1412          *      11111101 11....11 1xxxxxxx
1413          *  - ISATAP (draft-ietf-ngtrans-isatap-13.txt) 5.1
1414          *      00-00-5E-FE-xx-xx-xx-xx
1415          *  - value 0
1416          *  - XXX: already assigned to an address on the device
1417          */
1418         if (idev->rndid[0] == 0xfd && 
1419             (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1420             (idev->rndid[7]&0x80))
1421                 goto regen;
1422         if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1423                 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1424                         goto regen;
1425                 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1426                         goto regen;
1427         }
1428
1429         return 0;
1430 }
1431
1432 static void ipv6_regen_rndid(unsigned long data)
1433 {
1434         struct inet6_dev *idev = (struct inet6_dev *) data;
1435         unsigned long expires;
1436
1437         read_lock_bh(&addrconf_lock);
1438         write_lock_bh(&idev->lock);
1439
1440         if (idev->dead)
1441                 goto out;
1442
1443         if (__ipv6_regen_rndid(idev) < 0)
1444                 goto out;
1445         
1446         expires = jiffies +
1447                 idev->cnf.temp_prefered_lft * HZ - 
1448                 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1449         if (time_before(expires, jiffies)) {
1450                 printk(KERN_WARNING
1451                         "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1452                         idev->dev->name);
1453                 goto out;
1454         }
1455
1456         if (!mod_timer(&idev->regen_timer, expires))
1457                 in6_dev_hold(idev);
1458
1459 out:
1460         write_unlock_bh(&idev->lock);
1461         read_unlock_bh(&addrconf_lock);
1462         in6_dev_put(idev);
1463 }
1464
1465 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1466         int ret = 0;
1467
1468         if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1469                 ret = __ipv6_regen_rndid(idev);
1470         return ret;
1471 }
1472 #endif
1473
1474 /*
1475  *      Add prefix route.
1476  */
1477
1478 static void
1479 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1480                       unsigned long expires, u32 flags)
1481 {
1482         struct in6_rtmsg rtmsg;
1483
1484         memset(&rtmsg, 0, sizeof(rtmsg));
1485         ipv6_addr_copy(&rtmsg.rtmsg_dst, pfx);
1486         rtmsg.rtmsg_dst_len = plen;
1487         rtmsg.rtmsg_metric = IP6_RT_PRIO_ADDRCONF;
1488         rtmsg.rtmsg_ifindex = dev->ifindex;
1489         rtmsg.rtmsg_info = expires;
1490         rtmsg.rtmsg_flags = RTF_UP|flags;
1491         rtmsg.rtmsg_type = RTMSG_NEWROUTE;
1492
1493         /* Prevent useless cloning on PtP SIT.
1494            This thing is done here expecting that the whole
1495            class of non-broadcast devices need not cloning.
1496          */
1497         if (dev->type == ARPHRD_SIT && (dev->flags&IFF_POINTOPOINT))
1498                 rtmsg.rtmsg_flags |= RTF_NONEXTHOP;
1499
1500         ip6_route_add(&rtmsg, NULL, NULL, NULL);
1501 }
1502
1503 /* Create "default" multicast route to the interface */
1504
1505 static void addrconf_add_mroute(struct net_device *dev)
1506 {
1507         struct in6_rtmsg rtmsg;
1508
1509         memset(&rtmsg, 0, sizeof(rtmsg));
1510         ipv6_addr_set(&rtmsg.rtmsg_dst,
1511                       htonl(0xFF000000), 0, 0, 0);
1512         rtmsg.rtmsg_dst_len = 8;
1513         rtmsg.rtmsg_metric = IP6_RT_PRIO_ADDRCONF;
1514         rtmsg.rtmsg_ifindex = dev->ifindex;
1515         rtmsg.rtmsg_flags = RTF_UP;
1516         rtmsg.rtmsg_type = RTMSG_NEWROUTE;
1517         ip6_route_add(&rtmsg, NULL, NULL, NULL);
1518 }
1519
1520 static void sit_route_add(struct net_device *dev)
1521 {
1522         struct in6_rtmsg rtmsg;
1523
1524         memset(&rtmsg, 0, sizeof(rtmsg));
1525
1526         rtmsg.rtmsg_type        = RTMSG_NEWROUTE;
1527         rtmsg.rtmsg_metric      = IP6_RT_PRIO_ADDRCONF;
1528
1529         /* prefix length - 96 bits "::d.d.d.d" */
1530         rtmsg.rtmsg_dst_len     = 96;
1531         rtmsg.rtmsg_flags       = RTF_UP|RTF_NONEXTHOP;
1532         rtmsg.rtmsg_ifindex     = dev->ifindex;
1533
1534         ip6_route_add(&rtmsg, NULL, NULL, NULL);
1535 }
1536
1537 static void addrconf_add_lroute(struct net_device *dev)
1538 {
1539         struct in6_addr addr;
1540
1541         ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
1542         addrconf_prefix_route(&addr, 64, dev, 0, 0);
1543 }
1544
1545 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1546 {
1547         struct inet6_dev *idev;
1548
1549         ASSERT_RTNL();
1550
1551         if ((idev = ipv6_find_idev(dev)) == NULL)
1552                 return NULL;
1553
1554         /* Add default multicast route */
1555         addrconf_add_mroute(dev);
1556
1557         /* Add link local route */
1558         addrconf_add_lroute(dev);
1559         return idev;
1560 }
1561
1562 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1563 {
1564         struct prefix_info *pinfo;
1565         __u32 valid_lft;
1566         __u32 prefered_lft;
1567         int addr_type;
1568         unsigned long rt_expires;
1569         struct inet6_dev *in6_dev;
1570
1571         pinfo = (struct prefix_info *) opt;
1572         
1573         if (len < sizeof(struct prefix_info)) {
1574                 ADBG(("addrconf: prefix option too short\n"));
1575                 return;
1576         }
1577         
1578         /*
1579          *      Validation checks ([ADDRCONF], page 19)
1580          */
1581
1582         addr_type = ipv6_addr_type(&pinfo->prefix);
1583
1584         if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1585                 return;
1586
1587         valid_lft = ntohl(pinfo->valid);
1588         prefered_lft = ntohl(pinfo->prefered);
1589
1590         if (prefered_lft > valid_lft) {
1591                 if (net_ratelimit())
1592                         printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1593                 return;
1594         }
1595
1596         in6_dev = in6_dev_get(dev);
1597
1598         if (in6_dev == NULL) {
1599                 if (net_ratelimit())
1600                         printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1601                 return;
1602         }
1603
1604         /*
1605          *      Two things going on here:
1606          *      1) Add routes for on-link prefixes
1607          *      2) Configure prefixes with the auto flag set
1608          */
1609
1610         /* Avoid arithmetic overflow. Really, we could
1611            save rt_expires in seconds, likely valid_lft,
1612            but it would require division in fib gc, that it
1613            not good.
1614          */
1615         if (valid_lft >= 0x7FFFFFFF/HZ)
1616                 rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ);
1617         else
1618                 rt_expires = valid_lft * HZ;
1619
1620         /*
1621          * We convert this (in jiffies) to clock_t later.
1622          * Avoid arithmetic overflow there as well.
1623          * Overflow can happen only if HZ < USER_HZ.
1624          */
1625         if (HZ < USER_HZ && rt_expires > 0x7FFFFFFF / USER_HZ)
1626                 rt_expires = 0x7FFFFFFF / USER_HZ;
1627
1628         if (pinfo->onlink) {
1629                 struct rt6_info *rt;
1630                 rt = rt6_lookup(&pinfo->prefix, NULL, dev->ifindex, 1);
1631
1632                 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
1633                         if (rt->rt6i_flags&RTF_EXPIRES) {
1634                                 if (valid_lft == 0) {
1635                                         ip6_del_rt(rt, NULL, NULL, NULL);
1636                                         rt = NULL;
1637                                 } else {
1638                                         rt->rt6i_expires = jiffies + rt_expires;
1639                                 }
1640                         }
1641                 } else if (valid_lft) {
1642                         addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1643                                               dev, jiffies_to_clock_t(rt_expires), RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT);
1644                 }
1645                 if (rt)
1646                         dst_release(&rt->u.dst);
1647         }
1648
1649         /* Try to figure out our local address for this prefix */
1650
1651         if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1652                 struct inet6_ifaddr * ifp;
1653                 struct in6_addr addr;
1654                 int create = 0, update_lft = 0;
1655
1656                 if (pinfo->prefix_len == 64) {
1657                         memcpy(&addr, &pinfo->prefix, 8);
1658                         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1659                             ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1660                                 in6_dev_put(in6_dev);
1661                                 return;
1662                         }
1663                         goto ok;
1664                 }
1665                 if (net_ratelimit())
1666                         printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1667                                pinfo->prefix_len);
1668                 in6_dev_put(in6_dev);
1669                 return;
1670
1671 ok:
1672
1673                 ifp = ipv6_get_ifaddr(&addr, dev, 1);
1674
1675                 if (ifp == NULL && valid_lft) {
1676                         int max_addresses = in6_dev->cnf.max_addresses;
1677
1678                         /* Do not allow to create too much of autoconfigured
1679                          * addresses; this would be too easy way to crash kernel.
1680                          */
1681                         if (!max_addresses ||
1682                             ipv6_count_addresses(in6_dev) < max_addresses)
1683                                 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1684                                                     addr_type&IPV6_ADDR_SCOPE_MASK, 0);
1685
1686                         if (!ifp || IS_ERR(ifp)) {
1687                                 in6_dev_put(in6_dev);
1688                                 return;
1689                         }
1690
1691                         update_lft = create = 1;
1692                         ifp->cstamp = jiffies;
1693                         addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1694                 }
1695
1696                 if (ifp) {
1697                         int flags;
1698                         unsigned long now;
1699 #ifdef CONFIG_IPV6_PRIVACY
1700                         struct inet6_ifaddr *ift;
1701 #endif
1702                         u32 stored_lft;
1703
1704                         /* update lifetime (RFC2462 5.5.3 e) */
1705                         spin_lock(&ifp->lock);
1706                         now = jiffies;
1707                         if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1708                                 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1709                         else
1710                                 stored_lft = 0;
1711                         if (!update_lft && stored_lft) {
1712                                 if (valid_lft > MIN_VALID_LIFETIME ||
1713                                     valid_lft > stored_lft)
1714                                         update_lft = 1;
1715                                 else if (stored_lft <= MIN_VALID_LIFETIME) {
1716                                         /* valid_lft <= stored_lft is always true */
1717                                         /* XXX: IPsec */
1718                                         update_lft = 0;
1719                                 } else {
1720                                         valid_lft = MIN_VALID_LIFETIME;
1721                                         if (valid_lft < prefered_lft)
1722                                                 prefered_lft = valid_lft;
1723                                         update_lft = 1;
1724                                 }
1725                         }
1726
1727                         if (update_lft) {
1728                                 ifp->valid_lft = valid_lft;
1729                                 ifp->prefered_lft = prefered_lft;
1730                                 ifp->tstamp = now;
1731                                 flags = ifp->flags;
1732                                 ifp->flags &= ~IFA_F_DEPRECATED;
1733                                 spin_unlock(&ifp->lock);
1734
1735                                 if (!(flags&IFA_F_TENTATIVE))
1736                                         ipv6_ifa_notify(0, ifp);
1737                         } else
1738                                 spin_unlock(&ifp->lock);
1739
1740 #ifdef CONFIG_IPV6_PRIVACY
1741                         read_lock_bh(&in6_dev->lock);
1742                         /* update all temporary addresses in the list */
1743                         for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1744                                 /*
1745                                  * When adjusting the lifetimes of an existing
1746                                  * temporary address, only lower the lifetimes.
1747                                  * Implementations must not increase the
1748                                  * lifetimes of an existing temporary address
1749                                  * when processing a Prefix Information Option.
1750                                  */
1751                                 spin_lock(&ift->lock);
1752                                 flags = ift->flags;
1753                                 if (ift->valid_lft > valid_lft &&
1754                                     ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1755                                         ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1756                                 if (ift->prefered_lft > prefered_lft &&
1757                                     ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1758                                         ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1759                                 spin_unlock(&ift->lock);
1760                                 if (!(flags&IFA_F_TENTATIVE))
1761                                         ipv6_ifa_notify(0, ift);
1762                         }
1763
1764                         if (create && in6_dev->cnf.use_tempaddr > 0) {
1765                                 /*
1766                                  * When a new public address is created as described in [ADDRCONF],
1767                                  * also create a new temporary address.
1768                                  */
1769                                 read_unlock_bh(&in6_dev->lock); 
1770                                 ipv6_create_tempaddr(ifp, NULL);
1771                         } else {
1772                                 read_unlock_bh(&in6_dev->lock);
1773                         }
1774 #endif
1775                         in6_ifa_put(ifp);
1776                         addrconf_verify(0);
1777                 }
1778         }
1779         inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
1780         in6_dev_put(in6_dev);
1781 }
1782
1783 /*
1784  *      Set destination address.
1785  *      Special case for SIT interfaces where we create a new "virtual"
1786  *      device.
1787  */
1788 int addrconf_set_dstaddr(void __user *arg)
1789 {
1790         struct in6_ifreq ireq;
1791         struct net_device *dev;
1792         int err = -EINVAL;
1793
1794         rtnl_lock();
1795
1796         err = -EFAULT;
1797         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1798                 goto err_exit;
1799
1800         dev = __dev_get_by_index(ireq.ifr6_ifindex);
1801
1802         err = -ENODEV;
1803         if (dev == NULL)
1804                 goto err_exit;
1805
1806         if (dev->type == ARPHRD_SIT) {
1807                 struct ifreq ifr;
1808                 mm_segment_t    oldfs;
1809                 struct ip_tunnel_parm p;
1810
1811                 err = -EADDRNOTAVAIL;
1812                 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
1813                         goto err_exit;
1814
1815                 memset(&p, 0, sizeof(p));
1816                 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
1817                 p.iph.saddr = 0;
1818                 p.iph.version = 4;
1819                 p.iph.ihl = 5;
1820                 p.iph.protocol = IPPROTO_IPV6;
1821                 p.iph.ttl = 64;
1822                 ifr.ifr_ifru.ifru_data = (void __user *)&p;
1823
1824                 oldfs = get_fs(); set_fs(KERNEL_DS);
1825                 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
1826                 set_fs(oldfs);
1827
1828                 if (err == 0) {
1829                         err = -ENOBUFS;
1830                         if ((dev = __dev_get_by_name(p.name)) == NULL)
1831                                 goto err_exit;
1832                         err = dev_open(dev);
1833                 }
1834         }
1835
1836 err_exit:
1837         rtnl_unlock();
1838         return err;
1839 }
1840
1841 /*
1842  *      Manual configuration of address on an interface
1843  */
1844 static int inet6_addr_add(int ifindex, struct in6_addr *pfx, int plen)
1845 {
1846         struct inet6_ifaddr *ifp;
1847         struct inet6_dev *idev;
1848         struct net_device *dev;
1849         int scope;
1850
1851         ASSERT_RTNL();
1852         
1853         if ((dev = __dev_get_by_index(ifindex)) == NULL)
1854                 return -ENODEV;
1855         
1856         if (!(dev->flags&IFF_UP))
1857                 return -ENETDOWN;
1858
1859         if ((idev = addrconf_add_dev(dev)) == NULL)
1860                 return -ENOBUFS;
1861
1862         scope = ipv6_addr_scope(pfx);
1863
1864         ifp = ipv6_add_addr(idev, pfx, plen, scope, IFA_F_PERMANENT);
1865         if (!IS_ERR(ifp)) {
1866                 addrconf_dad_start(ifp, 0);
1867                 in6_ifa_put(ifp);
1868                 return 0;
1869         }
1870
1871         return PTR_ERR(ifp);
1872 }
1873
1874 static int inet6_addr_del(int ifindex, struct in6_addr *pfx, int plen)
1875 {
1876         struct inet6_ifaddr *ifp;
1877         struct inet6_dev *idev;
1878         struct net_device *dev;
1879         
1880         if ((dev = __dev_get_by_index(ifindex)) == NULL)
1881                 return -ENODEV;
1882
1883         if ((idev = __in6_dev_get(dev)) == NULL)
1884                 return -ENXIO;
1885
1886         read_lock_bh(&idev->lock);
1887         for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
1888                 if (ifp->prefix_len == plen &&
1889                     ipv6_addr_equal(pfx, &ifp->addr)) {
1890                         in6_ifa_hold(ifp);
1891                         read_unlock_bh(&idev->lock);
1892                         
1893                         ipv6_del_addr(ifp);
1894
1895                         /* If the last address is deleted administratively,
1896                            disable IPv6 on this interface.
1897                          */
1898                         if (idev->addr_list == NULL)
1899                                 addrconf_ifdown(idev->dev, 1);
1900                         return 0;
1901                 }
1902         }
1903         read_unlock_bh(&idev->lock);
1904         return -EADDRNOTAVAIL;
1905 }
1906
1907
1908 int addrconf_add_ifaddr(void __user *arg)
1909 {
1910         struct in6_ifreq ireq;
1911         int err;
1912         
1913         if (!capable(CAP_NET_ADMIN))
1914                 return -EPERM;
1915         
1916         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1917                 return -EFAULT;
1918
1919         rtnl_lock();
1920         err = inet6_addr_add(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
1921         rtnl_unlock();
1922         return err;
1923 }
1924
1925 int addrconf_del_ifaddr(void __user *arg)
1926 {
1927         struct in6_ifreq ireq;
1928         int err;
1929         
1930         if (!capable(CAP_NET_ADMIN))
1931                 return -EPERM;
1932
1933         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1934                 return -EFAULT;
1935
1936         rtnl_lock();
1937         err = inet6_addr_del(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
1938         rtnl_unlock();
1939         return err;
1940 }
1941
1942 static void sit_add_v4_addrs(struct inet6_dev *idev)
1943 {
1944         struct inet6_ifaddr * ifp;
1945         struct in6_addr addr;
1946         struct net_device *dev;
1947         int scope;
1948
1949         ASSERT_RTNL();
1950
1951         memset(&addr, 0, sizeof(struct in6_addr));
1952         memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
1953
1954         if (idev->dev->flags&IFF_POINTOPOINT) {
1955                 addr.s6_addr32[0] = htonl(0xfe800000);
1956                 scope = IFA_LINK;
1957         } else {
1958                 scope = IPV6_ADDR_COMPATv4;
1959         }
1960
1961         if (addr.s6_addr32[3]) {
1962                 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
1963                 if (!IS_ERR(ifp)) {
1964                         spin_lock_bh(&ifp->lock);
1965                         ifp->flags &= ~IFA_F_TENTATIVE;
1966                         spin_unlock_bh(&ifp->lock);
1967                         ipv6_ifa_notify(RTM_NEWADDR, ifp);
1968                         in6_ifa_put(ifp);
1969                 }
1970                 return;
1971         }
1972
1973         for (dev = dev_base; dev != NULL; dev = dev->next) {
1974                 struct in_device * in_dev = __in_dev_get_rtnl(dev);
1975                 if (in_dev && (dev->flags & IFF_UP)) {
1976                         struct in_ifaddr * ifa;
1977
1978                         int flag = scope;
1979
1980                         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1981                                 int plen;
1982
1983                                 addr.s6_addr32[3] = ifa->ifa_local;
1984
1985                                 if (ifa->ifa_scope == RT_SCOPE_LINK)
1986                                         continue;
1987                                 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
1988                                         if (idev->dev->flags&IFF_POINTOPOINT)
1989                                                 continue;
1990                                         flag |= IFA_HOST;
1991                                 }
1992                                 if (idev->dev->flags&IFF_POINTOPOINT)
1993                                         plen = 64;
1994                                 else
1995                                         plen = 96;
1996
1997                                 ifp = ipv6_add_addr(idev, &addr, plen, flag,
1998                                                     IFA_F_PERMANENT);
1999                                 if (!IS_ERR(ifp)) {
2000                                         spin_lock_bh(&ifp->lock);
2001                                         ifp->flags &= ~IFA_F_TENTATIVE;
2002                                         spin_unlock_bh(&ifp->lock);
2003                                         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2004                                         in6_ifa_put(ifp);
2005                                 }
2006                         }
2007                 }
2008         }
2009 }
2010
2011 static void init_loopback(struct net_device *dev)
2012 {
2013         struct inet6_dev  *idev;
2014         struct inet6_ifaddr * ifp;
2015
2016         /* ::1 */
2017
2018         ASSERT_RTNL();
2019
2020         if ((idev = ipv6_find_idev(dev)) == NULL) {
2021                 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2022                 return;
2023         }
2024
2025         ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
2026         if (!IS_ERR(ifp)) {
2027                 spin_lock_bh(&ifp->lock);
2028                 ifp->flags &= ~IFA_F_TENTATIVE;
2029                 spin_unlock_bh(&ifp->lock);
2030                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2031                 in6_ifa_put(ifp);
2032         }
2033 }
2034
2035 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2036 {
2037         struct inet6_ifaddr * ifp;
2038
2039         ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, IFA_F_PERMANENT);
2040         if (!IS_ERR(ifp)) {
2041                 addrconf_dad_start(ifp, 0);
2042                 in6_ifa_put(ifp);
2043         }
2044 }
2045
2046 static void addrconf_dev_config(struct net_device *dev)
2047 {
2048         struct in6_addr addr;
2049         struct inet6_dev    * idev;
2050
2051         ASSERT_RTNL();
2052
2053         if ((dev->type != ARPHRD_ETHER) && 
2054             (dev->type != ARPHRD_FDDI) &&
2055             (dev->type != ARPHRD_IEEE802_TR) &&
2056             (dev->type != ARPHRD_ARCNET) &&
2057             (dev->type != ARPHRD_INFINIBAND)) {
2058                 /* Alas, we support only Ethernet autoconfiguration. */
2059                 return;
2060         }
2061
2062         idev = addrconf_add_dev(dev);
2063         if (idev == NULL)
2064                 return;
2065
2066         memset(&addr, 0, sizeof(struct in6_addr));
2067         addr.s6_addr32[0] = htonl(0xFE800000);
2068
2069         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2070                 addrconf_add_linklocal(idev, &addr);
2071 }
2072
2073 static void addrconf_sit_config(struct net_device *dev)
2074 {
2075         struct inet6_dev *idev;
2076
2077         ASSERT_RTNL();
2078
2079         /* 
2080          * Configure the tunnel with one of our IPv4 
2081          * addresses... we should configure all of 
2082          * our v4 addrs in the tunnel
2083          */
2084
2085         if ((idev = ipv6_find_idev(dev)) == NULL) {
2086                 printk(KERN_DEBUG "init sit: add_dev failed\n");
2087                 return;
2088         }
2089
2090         sit_add_v4_addrs(idev);
2091
2092         if (dev->flags&IFF_POINTOPOINT) {
2093                 addrconf_add_mroute(dev);
2094                 addrconf_add_lroute(dev);
2095         } else
2096                 sit_route_add(dev);
2097 }
2098
2099 static inline int
2100 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2101 {
2102         struct in6_addr lladdr;
2103
2104         if (!ipv6_get_lladdr(link_dev, &lladdr)) {
2105                 addrconf_add_linklocal(idev, &lladdr);
2106                 return 0;
2107         }
2108         return -1;
2109 }
2110
2111 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2112 {
2113         struct net_device *link_dev;
2114
2115         /* first try to inherit the link-local address from the link device */
2116         if (idev->dev->iflink &&
2117             (link_dev = __dev_get_by_index(idev->dev->iflink))) {
2118                 if (!ipv6_inherit_linklocal(idev, link_dev))
2119                         return;
2120         }
2121         /* then try to inherit it from any device */
2122         for (link_dev = dev_base; link_dev; link_dev = link_dev->next) {
2123                 if (!ipv6_inherit_linklocal(idev, link_dev))
2124                         return;
2125         }
2126         printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2127 }
2128
2129 /*
2130  * Autoconfigure tunnel with a link-local address so routing protocols,
2131  * DHCPv6, MLD etc. can be run over the virtual link
2132  */
2133
2134 static void addrconf_ip6_tnl_config(struct net_device *dev)
2135 {
2136         struct inet6_dev *idev;
2137
2138         ASSERT_RTNL();
2139
2140         if ((idev = addrconf_add_dev(dev)) == NULL) {
2141                 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2142                 return;
2143         }
2144         ip6_tnl_add_linklocal(idev);
2145         addrconf_add_mroute(dev);
2146 }
2147
2148 static int addrconf_notify(struct notifier_block *this, unsigned long event, 
2149                            void * data)
2150 {
2151         struct net_device *dev = (struct net_device *) data;
2152         struct inet6_dev *idev = __in6_dev_get(dev);
2153         int run_pending = 0;
2154
2155         switch(event) {
2156         case NETDEV_UP:
2157         case NETDEV_CHANGE:
2158                 if (event == NETDEV_UP) {
2159                         if (!netif_carrier_ok(dev)) {
2160                                 /* device is not ready yet. */
2161                                 printk(KERN_INFO
2162                                         "ADDRCONF(NETDEV_UP): %s: "
2163                                         "link is not ready\n",
2164                                         dev->name);
2165                                 break;
2166                         }
2167                 } else {
2168                         if (!netif_carrier_ok(dev)) {
2169                                 /* device is still not ready. */
2170                                 break;
2171                         }
2172
2173                         if (idev) {
2174                                 if (idev->if_flags & IF_READY) {
2175                                         /* device is already configured. */
2176                                         break;
2177                                 }
2178                                 idev->if_flags |= IF_READY;
2179                         }
2180
2181                         printk(KERN_INFO
2182                                         "ADDRCONF(NETDEV_CHANGE): %s: "
2183                                         "link becomes ready\n",
2184                                         dev->name);
2185
2186                         run_pending = 1;
2187                 }
2188
2189                 switch(dev->type) {
2190                 case ARPHRD_SIT:
2191                         addrconf_sit_config(dev);
2192                         break;
2193                 case ARPHRD_TUNNEL6:
2194                         addrconf_ip6_tnl_config(dev);
2195                         break;
2196                 case ARPHRD_LOOPBACK:
2197                         init_loopback(dev);
2198                         break;
2199
2200                 default:
2201                         addrconf_dev_config(dev);
2202                         break;
2203                 };
2204                 if (idev) {
2205                         if (run_pending)
2206                                 addrconf_dad_run(idev);
2207
2208                         /* If the MTU changed during the interface down, when the
2209                            interface up, the changed MTU must be reflected in the
2210                            idev as well as routers.
2211                          */
2212                         if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2213                                 rt6_mtu_change(dev, dev->mtu);
2214                                 idev->cnf.mtu6 = dev->mtu;
2215                         }
2216                         idev->tstamp = jiffies;
2217                         inet6_ifinfo_notify(RTM_NEWLINK, idev);
2218                         /* If the changed mtu during down is lower than IPV6_MIN_MTU
2219                            stop IPv6 on this interface.
2220                          */
2221                         if (dev->mtu < IPV6_MIN_MTU)
2222                                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2223                 }
2224                 break;
2225
2226         case NETDEV_CHANGEMTU:
2227                 if ( idev && dev->mtu >= IPV6_MIN_MTU) {
2228                         rt6_mtu_change(dev, dev->mtu);
2229                         idev->cnf.mtu6 = dev->mtu;
2230                         break;
2231                 }
2232
2233                 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2234
2235         case NETDEV_DOWN:
2236         case NETDEV_UNREGISTER:
2237                 /*
2238                  *      Remove all addresses from this interface.
2239                  */
2240                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2241                 break;
2242
2243         case NETDEV_CHANGENAME:
2244 #ifdef CONFIG_SYSCTL
2245                 if (idev) {
2246                         addrconf_sysctl_unregister(&idev->cnf);
2247                         neigh_sysctl_unregister(idev->nd_parms);
2248                         neigh_sysctl_register(dev, idev->nd_parms,
2249                                               NET_IPV6, NET_IPV6_NEIGH, "ipv6",
2250                                               &ndisc_ifinfo_sysctl_change,
2251                                               NULL);
2252                         addrconf_sysctl_register(idev, &idev->cnf);
2253                 }
2254 #endif
2255                 break;
2256         };
2257
2258         return NOTIFY_OK;
2259 }
2260
2261 /*
2262  *      addrconf module should be notified of a device going up
2263  */
2264 static struct notifier_block ipv6_dev_notf = {
2265         .notifier_call = addrconf_notify,
2266         .priority = 0
2267 };
2268
2269 static int addrconf_ifdown(struct net_device *dev, int how)
2270 {
2271         struct inet6_dev *idev;
2272         struct inet6_ifaddr *ifa, **bifa;
2273         int i;
2274
2275         ASSERT_RTNL();
2276
2277         if (dev == &loopback_dev && how == 1)
2278                 how = 0;
2279
2280         rt6_ifdown(dev);
2281         neigh_ifdown(&nd_tbl, dev);
2282
2283         idev = __in6_dev_get(dev);
2284         if (idev == NULL)
2285                 return -ENODEV;
2286
2287         /* Step 1: remove reference to ipv6 device from parent device.
2288                    Do not dev_put!
2289          */
2290         if (how == 1) {
2291                 write_lock_bh(&addrconf_lock);
2292                 dev->ip6_ptr = NULL;
2293                 idev->dead = 1;
2294                 write_unlock_bh(&addrconf_lock);
2295
2296                 /* Step 1.5: remove snmp6 entry */
2297                 snmp6_unregister_dev(idev);
2298
2299         }
2300
2301         /* Step 2: clear hash table */
2302         for (i=0; i<IN6_ADDR_HSIZE; i++) {
2303                 bifa = &inet6_addr_lst[i];
2304
2305                 write_lock_bh(&addrconf_hash_lock);
2306                 while ((ifa = *bifa) != NULL) {
2307                         if (ifa->idev == idev) {
2308                                 *bifa = ifa->lst_next;
2309                                 ifa->lst_next = NULL;
2310                                 addrconf_del_timer(ifa);
2311                                 in6_ifa_put(ifa);
2312                                 continue;
2313                         }
2314                         bifa = &ifa->lst_next;
2315                 }
2316                 write_unlock_bh(&addrconf_hash_lock);
2317         }
2318
2319         write_lock_bh(&idev->lock);
2320
2321         /* Step 3: clear flags for stateless addrconf */
2322         if (how != 1)
2323                 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2324
2325         /* Step 4: clear address list */
2326 #ifdef CONFIG_IPV6_PRIVACY
2327         if (how == 1 && del_timer(&idev->regen_timer))
2328                 in6_dev_put(idev);
2329
2330         /* clear tempaddr list */
2331         while ((ifa = idev->tempaddr_list) != NULL) {
2332                 idev->tempaddr_list = ifa->tmp_next;
2333                 ifa->tmp_next = NULL;
2334                 ifa->dead = 1;
2335                 write_unlock_bh(&idev->lock);
2336                 spin_lock_bh(&ifa->lock);
2337
2338                 if (ifa->ifpub) {
2339                         in6_ifa_put(ifa->ifpub);
2340                         ifa->ifpub = NULL;
2341                 }
2342                 spin_unlock_bh(&ifa->lock);
2343                 in6_ifa_put(ifa);
2344                 write_lock_bh(&idev->lock);
2345         }
2346 #endif
2347         while ((ifa = idev->addr_list) != NULL) {
2348                 idev->addr_list = ifa->if_next;
2349                 ifa->if_next = NULL;
2350                 ifa->dead = 1;
2351                 addrconf_del_timer(ifa);
2352                 write_unlock_bh(&idev->lock);
2353
2354                 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2355                 in6_ifa_put(ifa);
2356
2357                 write_lock_bh(&idev->lock);
2358         }
2359         write_unlock_bh(&idev->lock);
2360
2361         /* Step 5: Discard multicast list */
2362
2363         if (how == 1)
2364                 ipv6_mc_destroy_dev(idev);
2365         else
2366                 ipv6_mc_down(idev);
2367
2368         /* Step 5: netlink notification of this interface */
2369         idev->tstamp = jiffies;
2370         inet6_ifinfo_notify(RTM_DELLINK, idev);
2371         
2372         /* Shot the device (if unregistered) */
2373
2374         if (how == 1) {
2375 #ifdef CONFIG_SYSCTL
2376                 addrconf_sysctl_unregister(&idev->cnf);
2377                 neigh_sysctl_unregister(idev->nd_parms);
2378 #endif
2379                 neigh_parms_release(&nd_tbl, idev->nd_parms);
2380                 neigh_ifdown(&nd_tbl, dev);
2381                 in6_dev_put(idev);
2382         }
2383         return 0;
2384 }
2385
2386 static void addrconf_rs_timer(unsigned long data)
2387 {
2388         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2389
2390         if (ifp->idev->cnf.forwarding)
2391                 goto out;
2392
2393         if (ifp->idev->if_flags & IF_RA_RCVD) {
2394                 /*
2395                  *      Announcement received after solicitation
2396                  *      was sent
2397                  */
2398                 goto out;
2399         }
2400
2401         spin_lock(&ifp->lock);
2402         if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2403                 struct in6_addr all_routers;
2404
2405                 /* The wait after the last probe can be shorter */
2406                 addrconf_mod_timer(ifp, AC_RS,
2407                                    (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2408                                    ifp->idev->cnf.rtr_solicit_delay :
2409                                    ifp->idev->cnf.rtr_solicit_interval);
2410                 spin_unlock(&ifp->lock);
2411
2412                 ipv6_addr_all_routers(&all_routers);
2413
2414                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2415         } else {
2416                 spin_unlock(&ifp->lock);
2417                 /*
2418                  * Note: we do not support deprecated "all on-link"
2419                  * assumption any longer.
2420                  */
2421                 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2422                        ifp->idev->dev->name);
2423         }
2424
2425 out:
2426         in6_ifa_put(ifp);
2427 }
2428
2429 /*
2430  *      Duplicate Address Detection
2431  */
2432 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2433 {
2434         unsigned long rand_num;
2435         struct inet6_dev *idev = ifp->idev;
2436
2437         rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2438         ifp->probes = idev->cnf.dad_transmits;
2439         addrconf_mod_timer(ifp, AC_DAD, rand_num);
2440 }
2441
2442 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2443 {
2444         struct inet6_dev *idev = ifp->idev;
2445         struct net_device *dev = idev->dev;
2446
2447         addrconf_join_solict(dev, &ifp->addr);
2448
2449         if (ifp->prefix_len != 128 && (ifp->flags&IFA_F_PERMANENT))
2450                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 0,
2451                                         flags);
2452
2453         net_srandom(ifp->addr.s6_addr32[3]);
2454
2455         read_lock_bh(&idev->lock);
2456         if (ifp->dead)
2457                 goto out;
2458         spin_lock_bh(&ifp->lock);
2459
2460         if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2461             !(ifp->flags&IFA_F_TENTATIVE)) {
2462                 ifp->flags &= ~IFA_F_TENTATIVE;
2463                 spin_unlock_bh(&ifp->lock);
2464                 read_unlock_bh(&idev->lock);
2465
2466                 addrconf_dad_completed(ifp);
2467                 return;
2468         }
2469
2470         if (idev->if_flags & IF_READY)
2471                 addrconf_dad_kick(ifp);
2472         else {
2473                 /*
2474                  * If the defice is not ready:
2475                  * - keep it tentative if it is a permanent address.
2476                  * - otherwise, kill it.
2477                  */
2478                 in6_ifa_hold(ifp);
2479                 addrconf_dad_stop(ifp);
2480         }
2481
2482         spin_unlock_bh(&ifp->lock);
2483 out:
2484         read_unlock_bh(&idev->lock);
2485 }
2486
2487 static void addrconf_dad_timer(unsigned long data)
2488 {
2489         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2490         struct inet6_dev *idev = ifp->idev;
2491         struct in6_addr unspec;
2492         struct in6_addr mcaddr;
2493
2494         read_lock_bh(&idev->lock);
2495         if (idev->dead) {
2496                 read_unlock_bh(&idev->lock);
2497                 goto out;
2498         }
2499         spin_lock_bh(&ifp->lock);
2500         if (ifp->probes == 0) {
2501                 /*
2502                  * DAD was successful
2503                  */
2504
2505                 ifp->flags &= ~IFA_F_TENTATIVE;
2506                 spin_unlock_bh(&ifp->lock);
2507                 read_unlock_bh(&idev->lock);
2508
2509                 addrconf_dad_completed(ifp);
2510
2511                 goto out;
2512         }
2513
2514         ifp->probes--;
2515         addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2516         spin_unlock_bh(&ifp->lock);
2517         read_unlock_bh(&idev->lock);
2518
2519         /* send a neighbour solicitation for our addr */
2520         memset(&unspec, 0, sizeof(unspec));
2521         addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2522         ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec);
2523 out:
2524         in6_ifa_put(ifp);
2525 }
2526
2527 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2528 {
2529         struct net_device *     dev = ifp->idev->dev;
2530
2531         /*
2532          *      Configure the address for reception. Now it is valid.
2533          */
2534
2535         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2536
2537         /* If added prefix is link local and forwarding is off,
2538            start sending router solicitations.
2539          */
2540
2541         if (ifp->idev->cnf.forwarding == 0 &&
2542             ifp->idev->cnf.rtr_solicits > 0 &&
2543             (dev->flags&IFF_LOOPBACK) == 0 &&
2544             (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2545                 struct in6_addr all_routers;
2546
2547                 ipv6_addr_all_routers(&all_routers);
2548
2549                 /*
2550                  *      If a host as already performed a random delay
2551                  *      [...] as part of DAD [...] there is no need
2552                  *      to delay again before sending the first RS
2553                  */
2554                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2555
2556                 spin_lock_bh(&ifp->lock);
2557                 ifp->probes = 1;
2558                 ifp->idev->if_flags |= IF_RS_SENT;
2559                 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2560                 spin_unlock_bh(&ifp->lock);
2561         }
2562 }
2563
2564 static void addrconf_dad_run(struct inet6_dev *idev) {
2565         struct inet6_ifaddr *ifp;
2566
2567         read_lock_bh(&idev->lock);
2568         for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2569                 spin_lock_bh(&ifp->lock);
2570                 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2571                         spin_unlock_bh(&ifp->lock);
2572                         continue;
2573                 }
2574                 spin_unlock_bh(&ifp->lock);
2575                 addrconf_dad_kick(ifp);
2576         }
2577         read_unlock_bh(&idev->lock);
2578 }
2579
2580 #ifdef CONFIG_PROC_FS
2581 struct if6_iter_state {
2582         int bucket;
2583 };
2584
2585 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2586 {
2587         struct inet6_ifaddr *ifa = NULL;
2588         struct if6_iter_state *state = seq->private;
2589
2590         for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2591                 ifa = inet6_addr_lst[state->bucket];
2592                 if (ifa)
2593                         break;
2594         }
2595         return ifa;
2596 }
2597
2598 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2599 {
2600         struct if6_iter_state *state = seq->private;
2601
2602         ifa = ifa->lst_next;
2603 try_again:
2604         if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2605                 ifa = inet6_addr_lst[state->bucket];
2606                 goto try_again;
2607         }
2608         return ifa;
2609 }
2610
2611 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2612 {
2613         struct inet6_ifaddr *ifa = if6_get_first(seq);
2614
2615         if (ifa)
2616                 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2617                         --pos;
2618         return pos ? NULL : ifa;
2619 }
2620
2621 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2622 {
2623         read_lock_bh(&addrconf_hash_lock);
2624         return if6_get_idx(seq, *pos);
2625 }
2626
2627 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2628 {
2629         struct inet6_ifaddr *ifa;
2630
2631         ifa = if6_get_next(seq, v);
2632         ++*pos;
2633         return ifa;
2634 }
2635
2636 static void if6_seq_stop(struct seq_file *seq, void *v)
2637 {
2638         read_unlock_bh(&addrconf_hash_lock);
2639 }
2640
2641 static int if6_seq_show(struct seq_file *seq, void *v)
2642 {
2643         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2644         seq_printf(seq,
2645                    "%04x%04x%04x%04x%04x%04x%04x%04x %02x %02x %02x %02x %8s\n",
2646                    NIP6(ifp->addr),
2647                    ifp->idev->dev->ifindex,
2648                    ifp->prefix_len,
2649                    ifp->scope,
2650                    ifp->flags,
2651                    ifp->idev->dev->name);
2652         return 0;
2653 }
2654
2655 static struct seq_operations if6_seq_ops = {
2656         .start  = if6_seq_start,
2657         .next   = if6_seq_next,
2658         .show   = if6_seq_show,
2659         .stop   = if6_seq_stop,
2660 };
2661
2662 static int if6_seq_open(struct inode *inode, struct file *file)
2663 {
2664         struct seq_file *seq;
2665         int rc = -ENOMEM;
2666         struct if6_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL);
2667
2668         if (!s)
2669                 goto out;
2670         memset(s, 0, sizeof(*s));
2671
2672         rc = seq_open(file, &if6_seq_ops);
2673         if (rc)
2674                 goto out_kfree;
2675
2676         seq = file->private_data;
2677         seq->private = s;
2678 out:
2679         return rc;
2680 out_kfree:
2681         kfree(s);
2682         goto out;
2683 }
2684
2685 static struct file_operations if6_fops = {
2686         .owner          = THIS_MODULE,
2687         .open           = if6_seq_open,
2688         .read           = seq_read,
2689         .llseek         = seq_lseek,
2690         .release        = seq_release_private,
2691 };
2692
2693 int __init if6_proc_init(void)
2694 {
2695         if (!proc_net_fops_create("if_inet6", S_IRUGO, &if6_fops))
2696                 return -ENOMEM;
2697         return 0;
2698 }
2699
2700 void if6_proc_exit(void)
2701 {
2702         proc_net_remove("if_inet6");
2703 }
2704 #endif  /* CONFIG_PROC_FS */
2705
2706 /*
2707  *      Periodic address status verification
2708  */
2709
2710 static void addrconf_verify(unsigned long foo)
2711 {
2712         struct inet6_ifaddr *ifp;
2713         unsigned long now, next;
2714         int i;
2715
2716         spin_lock_bh(&addrconf_verify_lock);
2717         now = jiffies;
2718         next = now + ADDR_CHECK_FREQUENCY;
2719
2720         del_timer(&addr_chk_timer);
2721
2722         for (i=0; i < IN6_ADDR_HSIZE; i++) {
2723
2724 restart:
2725                 read_lock(&addrconf_hash_lock);
2726                 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
2727                         unsigned long age;
2728 #ifdef CONFIG_IPV6_PRIVACY
2729                         unsigned long regen_advance;
2730 #endif
2731
2732                         if (ifp->flags & IFA_F_PERMANENT)
2733                                 continue;
2734
2735                         spin_lock(&ifp->lock);
2736                         age = (now - ifp->tstamp) / HZ;
2737
2738 #ifdef CONFIG_IPV6_PRIVACY
2739                         regen_advance = ifp->idev->cnf.regen_max_retry * 
2740                                         ifp->idev->cnf.dad_transmits * 
2741                                         ifp->idev->nd_parms->retrans_time / HZ;
2742 #endif
2743
2744                         if (age >= ifp->valid_lft) {
2745                                 spin_unlock(&ifp->lock);
2746                                 in6_ifa_hold(ifp);
2747                                 read_unlock(&addrconf_hash_lock);
2748                                 ipv6_del_addr(ifp);
2749                                 goto restart;
2750                         } else if (age >= ifp->prefered_lft) {
2751                                 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
2752                                 int deprecate = 0;
2753
2754                                 if (!(ifp->flags&IFA_F_DEPRECATED)) {
2755                                         deprecate = 1;
2756                                         ifp->flags |= IFA_F_DEPRECATED;
2757                                 }
2758
2759                                 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
2760                                         next = ifp->tstamp + ifp->valid_lft * HZ;
2761
2762                                 spin_unlock(&ifp->lock);
2763
2764                                 if (deprecate) {
2765                                         in6_ifa_hold(ifp);
2766                                         read_unlock(&addrconf_hash_lock);
2767
2768                                         ipv6_ifa_notify(0, ifp);
2769                                         in6_ifa_put(ifp);
2770                                         goto restart;
2771                                 }
2772 #ifdef CONFIG_IPV6_PRIVACY
2773                         } else if ((ifp->flags&IFA_F_TEMPORARY) &&
2774                                    !(ifp->flags&IFA_F_TENTATIVE)) {
2775                                 if (age >= ifp->prefered_lft - regen_advance) {
2776                                         struct inet6_ifaddr *ifpub = ifp->ifpub;
2777                                         if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2778                                                 next = ifp->tstamp + ifp->prefered_lft * HZ;
2779                                         if (!ifp->regen_count && ifpub) {
2780                                                 ifp->regen_count++;
2781                                                 in6_ifa_hold(ifp);
2782                                                 in6_ifa_hold(ifpub);
2783                                                 spin_unlock(&ifp->lock);
2784                                                 read_unlock(&addrconf_hash_lock);
2785                                                 ipv6_create_tempaddr(ifpub, ifp);
2786                                                 in6_ifa_put(ifpub);
2787                                                 in6_ifa_put(ifp);
2788                                                 goto restart;
2789                                         }
2790                                 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
2791                                         next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
2792                                 spin_unlock(&ifp->lock);
2793 #endif
2794                         } else {
2795                                 /* ifp->prefered_lft <= ifp->valid_lft */
2796                                 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2797                                         next = ifp->tstamp + ifp->prefered_lft * HZ;
2798                                 spin_unlock(&ifp->lock);
2799                         }
2800                 }
2801                 read_unlock(&addrconf_hash_lock);
2802         }
2803
2804         addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
2805         add_timer(&addr_chk_timer);
2806         spin_unlock_bh(&addrconf_verify_lock);
2807 }
2808
2809 static int
2810 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
2811 {
2812         struct rtattr **rta = arg;
2813         struct ifaddrmsg *ifm = NLMSG_DATA(nlh);
2814         struct in6_addr *pfx;
2815
2816         pfx = NULL;
2817         if (rta[IFA_ADDRESS-1]) {
2818                 if (RTA_PAYLOAD(rta[IFA_ADDRESS-1]) < sizeof(*pfx))
2819                         return -EINVAL;
2820                 pfx = RTA_DATA(rta[IFA_ADDRESS-1]);
2821         }
2822         if (rta[IFA_LOCAL-1]) {
2823                 if (pfx && memcmp(pfx, RTA_DATA(rta[IFA_LOCAL-1]), sizeof(*pfx)))
2824                         return -EINVAL;
2825                 pfx = RTA_DATA(rta[IFA_LOCAL-1]);
2826         }
2827         if (pfx == NULL)
2828                 return -EINVAL;
2829
2830         return inet6_addr_del(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
2831 }
2832
2833 static int
2834 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
2835 {
2836         struct rtattr  **rta = arg;
2837         struct ifaddrmsg *ifm = NLMSG_DATA(nlh);
2838         struct in6_addr *pfx;
2839
2840         pfx = NULL;
2841         if (rta[IFA_ADDRESS-1]) {
2842                 if (RTA_PAYLOAD(rta[IFA_ADDRESS-1]) < sizeof(*pfx))
2843                         return -EINVAL;
2844                 pfx = RTA_DATA(rta[IFA_ADDRESS-1]);
2845         }
2846         if (rta[IFA_LOCAL-1]) {
2847                 if (pfx && memcmp(pfx, RTA_DATA(rta[IFA_LOCAL-1]), sizeof(*pfx)))
2848                         return -EINVAL;
2849                 pfx = RTA_DATA(rta[IFA_LOCAL-1]);
2850         }
2851         if (pfx == NULL)
2852                 return -EINVAL;
2853
2854         return inet6_addr_add(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
2855 }
2856
2857 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
2858                              u32 pid, u32 seq, int event, unsigned int flags)
2859 {
2860         struct ifaddrmsg *ifm;
2861         struct nlmsghdr  *nlh;
2862         struct ifa_cacheinfo ci;
2863         unsigned char    *b = skb->tail;
2864
2865         nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags);
2866         ifm = NLMSG_DATA(nlh);
2867         ifm->ifa_family = AF_INET6;
2868         ifm->ifa_prefixlen = ifa->prefix_len;
2869         ifm->ifa_flags = ifa->flags;
2870         ifm->ifa_scope = RT_SCOPE_UNIVERSE;
2871         if (ifa->scope&IFA_HOST)
2872                 ifm->ifa_scope = RT_SCOPE_HOST;
2873         else if (ifa->scope&IFA_LINK)
2874                 ifm->ifa_scope = RT_SCOPE_LINK;
2875         else if (ifa->scope&IFA_SITE)
2876                 ifm->ifa_scope = RT_SCOPE_SITE;
2877         ifm->ifa_index = ifa->idev->dev->ifindex;
2878         RTA_PUT(skb, IFA_ADDRESS, 16, &ifa->addr);
2879         if (!(ifa->flags&IFA_F_PERMANENT)) {
2880                 ci.ifa_prefered = ifa->prefered_lft;
2881                 ci.ifa_valid = ifa->valid_lft;
2882                 if (ci.ifa_prefered != INFINITY_LIFE_TIME) {
2883                         long tval = (jiffies - ifa->tstamp)/HZ;
2884                         ci.ifa_prefered -= tval;
2885                         if (ci.ifa_valid != INFINITY_LIFE_TIME)
2886                                 ci.ifa_valid -= tval;
2887                 }
2888         } else {
2889                 ci.ifa_prefered = INFINITY_LIFE_TIME;
2890                 ci.ifa_valid = INFINITY_LIFE_TIME;
2891         }
2892         ci.cstamp = (__u32)(TIME_DELTA(ifa->cstamp, INITIAL_JIFFIES) / HZ * 100
2893                     + TIME_DELTA(ifa->cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
2894         ci.tstamp = (__u32)(TIME_DELTA(ifa->tstamp, INITIAL_JIFFIES) / HZ * 100
2895                     + TIME_DELTA(ifa->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
2896         RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci);
2897         nlh->nlmsg_len = skb->tail - b;
2898         return skb->len;
2899
2900 nlmsg_failure:
2901 rtattr_failure:
2902         skb_trim(skb, b - skb->data);
2903         return -1;
2904 }
2905
2906 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
2907                                 u32 pid, u32 seq, int event, u16 flags)
2908 {
2909         struct ifaddrmsg *ifm;
2910         struct nlmsghdr  *nlh;
2911         struct ifa_cacheinfo ci;
2912         unsigned char    *b = skb->tail;
2913
2914         nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags);
2915         ifm = NLMSG_DATA(nlh);
2916         ifm->ifa_family = AF_INET6;     
2917         ifm->ifa_prefixlen = 128;
2918         ifm->ifa_flags = IFA_F_PERMANENT;
2919         ifm->ifa_scope = RT_SCOPE_UNIVERSE;
2920         if (ipv6_addr_scope(&ifmca->mca_addr)&IFA_SITE)
2921                 ifm->ifa_scope = RT_SCOPE_SITE;
2922         ifm->ifa_index = ifmca->idev->dev->ifindex;
2923         RTA_PUT(skb, IFA_MULTICAST, 16, &ifmca->mca_addr);
2924         ci.cstamp = (__u32)(TIME_DELTA(ifmca->mca_cstamp, INITIAL_JIFFIES) / HZ
2925                     * 100 + TIME_DELTA(ifmca->mca_cstamp, INITIAL_JIFFIES) % HZ
2926                     * 100 / HZ);
2927         ci.tstamp = (__u32)(TIME_DELTA(ifmca->mca_tstamp, INITIAL_JIFFIES) / HZ
2928                     * 100 + TIME_DELTA(ifmca->mca_tstamp, INITIAL_JIFFIES) % HZ
2929                     * 100 / HZ);
2930         ci.ifa_prefered = INFINITY_LIFE_TIME;
2931         ci.ifa_valid = INFINITY_LIFE_TIME;
2932         RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci);
2933         nlh->nlmsg_len = skb->tail - b;
2934         return skb->len;
2935
2936 nlmsg_failure:
2937 rtattr_failure:
2938         skb_trim(skb, b - skb->data);
2939         return -1;
2940 }
2941
2942 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
2943                                 u32 pid, u32 seq, int event, unsigned int flags)
2944 {
2945         struct ifaddrmsg *ifm;
2946         struct nlmsghdr  *nlh;
2947         struct ifa_cacheinfo ci;
2948         unsigned char    *b = skb->tail;
2949
2950         nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags);
2951         ifm = NLMSG_DATA(nlh);
2952         ifm->ifa_family = AF_INET6;     
2953         ifm->ifa_prefixlen = 128;
2954         ifm->ifa_flags = IFA_F_PERMANENT;
2955         ifm->ifa_scope = RT_SCOPE_UNIVERSE;
2956         if (ipv6_addr_scope(&ifaca->aca_addr)&IFA_SITE)
2957                 ifm->ifa_scope = RT_SCOPE_SITE;
2958         ifm->ifa_index = ifaca->aca_idev->dev->ifindex;
2959         RTA_PUT(skb, IFA_ANYCAST, 16, &ifaca->aca_addr);
2960         ci.cstamp = (__u32)(TIME_DELTA(ifaca->aca_cstamp, INITIAL_JIFFIES) / HZ
2961                     * 100 + TIME_DELTA(ifaca->aca_cstamp, INITIAL_JIFFIES) % HZ
2962                     * 100 / HZ);
2963         ci.tstamp = (__u32)(TIME_DELTA(ifaca->aca_tstamp, INITIAL_JIFFIES) / HZ
2964                     * 100 + TIME_DELTA(ifaca->aca_tstamp, INITIAL_JIFFIES) % HZ
2965                     * 100 / HZ);
2966         ci.ifa_prefered = INFINITY_LIFE_TIME;
2967         ci.ifa_valid = INFINITY_LIFE_TIME;
2968         RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci);
2969         nlh->nlmsg_len = skb->tail - b;
2970         return skb->len;
2971
2972 nlmsg_failure:
2973 rtattr_failure:
2974         skb_trim(skb, b - skb->data);
2975         return -1;
2976 }
2977
2978 enum addr_type_t
2979 {
2980         UNICAST_ADDR,
2981         MULTICAST_ADDR,
2982         ANYCAST_ADDR,
2983 };
2984
2985 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
2986                            enum addr_type_t type)
2987 {
2988         int idx, ip_idx;
2989         int s_idx, s_ip_idx;
2990         int err = 1;
2991         struct net_device *dev;
2992         struct inet6_dev *idev = NULL;
2993         struct inet6_ifaddr *ifa;
2994         struct ifmcaddr6 *ifmca;
2995         struct ifacaddr6 *ifaca;
2996
2997         s_idx = cb->args[0];
2998         s_ip_idx = ip_idx = cb->args[1];
2999         read_lock(&dev_base_lock);
3000         
3001         for (dev = dev_base, idx = 0; dev; dev = dev->next, idx++) {
3002                 if (idx < s_idx)
3003                         continue;
3004                 if (idx > s_idx)
3005                         s_ip_idx = 0;
3006                 ip_idx = 0;
3007                 if ((idev = in6_dev_get(dev)) == NULL)
3008                         continue;
3009                 read_lock_bh(&idev->lock);
3010                 switch (type) {
3011                 case UNICAST_ADDR:
3012                         /* unicast address incl. temp addr */
3013                         for (ifa = idev->addr_list; ifa;
3014                              ifa = ifa->if_next, ip_idx++) {
3015                                 if (ip_idx < s_ip_idx)
3016                                         continue;
3017                                 if ((err = inet6_fill_ifaddr(skb, ifa, 
3018                                     NETLINK_CB(cb->skb).pid, 
3019                                     cb->nlh->nlmsg_seq, RTM_NEWADDR,
3020                                     NLM_F_MULTI)) <= 0)
3021                                         goto done;
3022                         }
3023                         break;
3024                 case MULTICAST_ADDR:
3025                         /* multicast address */
3026                         for (ifmca = idev->mc_list; ifmca; 
3027                              ifmca = ifmca->next, ip_idx++) {
3028                                 if (ip_idx < s_ip_idx)
3029                                         continue;
3030                                 if ((err = inet6_fill_ifmcaddr(skb, ifmca, 
3031                                     NETLINK_CB(cb->skb).pid, 
3032                                     cb->nlh->nlmsg_seq, RTM_GETMULTICAST,
3033                                     NLM_F_MULTI)) <= 0)
3034                                         goto done;
3035                         }
3036                         break;
3037                 case ANYCAST_ADDR:
3038                         /* anycast address */
3039                         for (ifaca = idev->ac_list; ifaca;
3040                              ifaca = ifaca->aca_next, ip_idx++) {
3041                                 if (ip_idx < s_ip_idx)
3042                                         continue;
3043                                 if ((err = inet6_fill_ifacaddr(skb, ifaca, 
3044                                     NETLINK_CB(cb->skb).pid, 
3045                                     cb->nlh->nlmsg_seq, RTM_GETANYCAST,
3046                                     NLM_F_MULTI)) <= 0) 
3047                                         goto done;
3048                         }
3049                         break;
3050                 default:
3051                         break;
3052                 }
3053                 read_unlock_bh(&idev->lock);
3054                 in6_dev_put(idev);
3055         }
3056 done:
3057         if (err <= 0) {
3058                 read_unlock_bh(&idev->lock);
3059                 in6_dev_put(idev);
3060         }
3061         read_unlock(&dev_base_lock);
3062         cb->args[0] = idx;
3063         cb->args[1] = ip_idx;
3064         return skb->len;
3065 }
3066
3067 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3068 {
3069         enum addr_type_t type = UNICAST_ADDR;
3070         return inet6_dump_addr(skb, cb, type);
3071 }
3072
3073 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3074 {
3075         enum addr_type_t type = MULTICAST_ADDR;
3076         return inet6_dump_addr(skb, cb, type);
3077 }
3078
3079
3080 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3081 {
3082         enum addr_type_t type = ANYCAST_ADDR;
3083         return inet6_dump_addr(skb, cb, type);
3084 }
3085
3086 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3087 {
3088         struct sk_buff *skb;
3089         int size = NLMSG_SPACE(sizeof(struct ifaddrmsg)+128);
3090
3091         skb = alloc_skb(size, GFP_ATOMIC);
3092         if (!skb) {
3093                 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFADDR, ENOBUFS);
3094                 return;
3095         }
3096         if (inet6_fill_ifaddr(skb, ifa, current->pid, 0, event, 0) < 0) {
3097                 kfree_skb(skb);
3098                 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFADDR, EINVAL);
3099                 return;
3100         }
3101         NETLINK_CB(skb).dst_group = RTNLGRP_IPV6_IFADDR;
3102         netlink_broadcast(rtnl, skb, 0, RTNLGRP_IPV6_IFADDR, GFP_ATOMIC);
3103 }
3104
3105 static void inline ipv6_store_devconf(struct ipv6_devconf *cnf,
3106                                 __s32 *array, int bytes)
3107 {
3108         memset(array, 0, bytes);
3109         array[DEVCONF_FORWARDING] = cnf->forwarding;
3110         array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3111         array[DEVCONF_MTU6] = cnf->mtu6;
3112         array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3113         array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3114         array[DEVCONF_AUTOCONF] = cnf->autoconf;
3115         array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3116         array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3117         array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3118         array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3119         array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3120 #ifdef CONFIG_IPV6_PRIVACY
3121         array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3122         array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3123         array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3124         array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3125         array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3126 #endif
3127         array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3128 }
3129
3130 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 
3131                              u32 pid, u32 seq, int event, unsigned int flags)
3132 {
3133         struct net_device       *dev = idev->dev;
3134         __s32                   *array = NULL;
3135         struct ifinfomsg        *r;
3136         struct nlmsghdr         *nlh;
3137         unsigned char           *b = skb->tail;
3138         struct rtattr           *subattr;
3139         __u32                   mtu = dev->mtu;
3140         struct ifla_cacheinfo   ci;
3141
3142         nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*r), flags);
3143         r = NLMSG_DATA(nlh);
3144         r->ifi_family = AF_INET6;
3145         r->__ifi_pad = 0;
3146         r->ifi_type = dev->type;
3147         r->ifi_index = dev->ifindex;
3148         r->ifi_flags = dev_get_flags(dev);
3149         r->ifi_change = 0;
3150
3151         RTA_PUT(skb, IFLA_IFNAME, strlen(dev->name)+1, dev->name);
3152
3153         if (dev->addr_len)
3154                 RTA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3155
3156         RTA_PUT(skb, IFLA_MTU, sizeof(mtu), &mtu);
3157         if (dev->ifindex != dev->iflink)
3158                 RTA_PUT(skb, IFLA_LINK, sizeof(int), &dev->iflink);
3159                         
3160         subattr = (struct rtattr*)skb->tail;
3161
3162         RTA_PUT(skb, IFLA_PROTINFO, 0, NULL);
3163
3164         /* return the device flags */
3165         RTA_PUT(skb, IFLA_INET6_FLAGS, sizeof(__u32), &idev->if_flags);
3166
3167         /* return interface cacheinfo */
3168         ci.max_reasm_len = IPV6_MAXPLEN;
3169         ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3170                     + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3171         ci.reachable_time = idev->nd_parms->reachable_time;
3172         ci.retrans_time = idev->nd_parms->retrans_time;
3173         RTA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3174         
3175         /* return the device sysctl params */
3176         if ((array = kmalloc(DEVCONF_MAX * sizeof(*array), GFP_ATOMIC)) == NULL)
3177                 goto rtattr_failure;
3178         ipv6_store_devconf(&idev->cnf, array, DEVCONF_MAX * sizeof(*array));
3179         RTA_PUT(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(*array), array);
3180
3181         /* XXX - Statistics/MC not implemented */
3182         subattr->rta_len = skb->tail - (u8*)subattr;
3183
3184         nlh->nlmsg_len = skb->tail - b;
3185         kfree(array);
3186         return skb->len;
3187
3188 nlmsg_failure:
3189 rtattr_failure:
3190         kfree(array);
3191         skb_trim(skb, b - skb->data);
3192         return -1;
3193 }
3194
3195 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3196 {
3197         int idx, err;
3198         int s_idx = cb->args[0];
3199         struct net_device *dev;
3200         struct inet6_dev *idev;
3201
3202         read_lock(&dev_base_lock);
3203         for (dev=dev_base, idx=0; dev; dev = dev->next, idx++) {
3204                 if (idx < s_idx)
3205                         continue;
3206                 if ((idev = in6_dev_get(dev)) == NULL)
3207                         continue;
3208                 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid, 
3209                                 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
3210                 in6_dev_put(idev);
3211                 if (err <= 0)
3212                         break;
3213         }
3214         read_unlock(&dev_base_lock);
3215         cb->args[0] = idx;
3216
3217         return skb->len;
3218 }
3219
3220 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3221 {
3222         struct sk_buff *skb;
3223         /* 128 bytes ?? */
3224         int size = NLMSG_SPACE(sizeof(struct ifinfomsg)+128);
3225         
3226         skb = alloc_skb(size, GFP_ATOMIC);
3227         if (!skb) {
3228                 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFINFO, ENOBUFS);
3229                 return;
3230         }
3231         if (inet6_fill_ifinfo(skb, idev, current->pid, 0, event, 0) < 0) {
3232                 kfree_skb(skb);
3233                 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFINFO, EINVAL);
3234                 return;
3235         }
3236         NETLINK_CB(skb).dst_group = RTNLGRP_IPV6_IFINFO;
3237         netlink_broadcast(rtnl, skb, 0, RTNLGRP_IPV6_IFINFO, GFP_ATOMIC);
3238 }
3239
3240 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
3241                         struct prefix_info *pinfo, u32 pid, u32 seq, 
3242                         int event,&nb