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[PATCH] PCIE: make bus_id for PCI Express devices unique
[linux/fpc-iii.git] / net / ipv6 / addrconf.c
blobe53e421eeee94b3ecdb842ccd4b1d0d24c4c3b58
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 = inet6_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 static 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 spin_unlock_bh(&ifp->lock);
2472 read_unlock_bh(&idev->lock);
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 return;
2481 }
2482 addrconf_dad_kick(ifp);
2483 spin_unlock_bh(&ifp->lock);
2484 out:
2485 read_unlock_bh(&idev->lock);
2486 }
2487
2488 static void addrconf_dad_timer(unsigned long data)
2489 {
2490 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2491 struct inet6_dev *idev = ifp->idev;
2492 struct in6_addr unspec;
2493 struct in6_addr mcaddr;
2494
2495 read_lock_bh(&idev->lock);
2496 if (idev->dead) {
2497 read_unlock_bh(&idev->lock);
2498 goto out;
2499 }
2500 spin_lock_bh(&ifp->lock);
2501 if (ifp->probes == 0) {
2502 /*
2503 * DAD was successful
2504 */
2505
2506 ifp->flags &= ~IFA_F_TENTATIVE;
2507 spin_unlock_bh(&ifp->lock);
2508 read_unlock_bh(&idev->lock);
2509
2510 addrconf_dad_completed(ifp);
2511
2512 goto out;
2513 }
2514
2515 ifp->probes--;
2516 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2517 spin_unlock_bh(&ifp->lock);
2518 read_unlock_bh(&idev->lock);
2519
2520 /* send a neighbour solicitation for our addr */
2521 memset(&unspec, 0, sizeof(unspec));
2522 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2523 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec);
2524 out:
2525 in6_ifa_put(ifp);
2526 }
2527
2528 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2529 {
2530 struct net_device * dev = ifp->idev->dev;
2531
2532 /*
2533 * Configure the address for reception. Now it is valid.
2534 */
2535
2536 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2537
2538 /* If added prefix is link local and forwarding is off,
2539 start sending router solicitations.
2540 */
2541
2542 if (ifp->idev->cnf.forwarding == 0 &&
2543 ifp->idev->cnf.rtr_solicits > 0 &&
2544 (dev->flags&IFF_LOOPBACK) == 0 &&
2545 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2546 struct in6_addr all_routers;
2547
2548 ipv6_addr_all_routers(&all_routers);
2549
2550 /*
2551 * If a host as already performed a random delay
2552 * [...] as part of DAD [...] there is no need
2553 * to delay again before sending the first RS
2554 */
2555 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2556
2557 spin_lock_bh(&ifp->lock);
2558 ifp->probes = 1;
2559 ifp->idev->if_flags |= IF_RS_SENT;
2560 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2561 spin_unlock_bh(&ifp->lock);
2562 }
2563 }
2564
2565 static void addrconf_dad_run(struct inet6_dev *idev) {
2566 struct inet6_ifaddr *ifp;
2567
2568 read_lock_bh(&idev->lock);
2569 for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2570 spin_lock_bh(&ifp->lock);
2571 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2572 spin_unlock_bh(&ifp->lock);
2573 continue;
2574 }
2575 spin_unlock_bh(&ifp->lock);
2576 addrconf_dad_kick(ifp);
2577 }
2578 read_unlock_bh(&idev->lock);
2579 }
2580
2581 #ifdef CONFIG_PROC_FS
2582 struct if6_iter_state {
2583 int bucket;
2584 };
2585
2586 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2587 {
2588 struct inet6_ifaddr *ifa = NULL;
2589 struct if6_iter_state *state = seq->private;
2590
2591 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2592 ifa = inet6_addr_lst[state->bucket];
2593 if (ifa)
2594 break;
2595 }
2596 return ifa;
2597 }
2598
2599 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2600 {
2601 struct if6_iter_state *state = seq->private;
2602
2603 ifa = ifa->lst_next;
2604 try_again:
2605 if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2606 ifa = inet6_addr_lst[state->bucket];
2607 goto try_again;
2608 }
2609 return ifa;
2610 }
2611
2612 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2613 {
2614 struct inet6_ifaddr *ifa = if6_get_first(seq);
2615
2616 if (ifa)
2617 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2618 --pos;
2619 return pos ? NULL : ifa;
2620 }
2621
2622 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2623 {
2624 read_lock_bh(&addrconf_hash_lock);
2625 return if6_get_idx(seq, *pos);
2626 }
2627
2628 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2629 {
2630 struct inet6_ifaddr *ifa;
2631
2632 ifa = if6_get_next(seq, v);
2633 ++*pos;
2634 return ifa;
2635 }
2636
2637 static void if6_seq_stop(struct seq_file *seq, void *v)
2638 {
2639 read_unlock_bh(&addrconf_hash_lock);
2640 }
2641
2642 static int if6_seq_show(struct seq_file *seq, void *v)
2643 {
2644 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2645 seq_printf(seq,
2646 "%04x%04x%04x%04x%04x%04x%04x%04x %02x %02x %02x %02x %8s\n",
2647 NIP6(ifp->addr),
2648 ifp->idev->dev->ifindex,
2649 ifp->prefix_len,
2650 ifp->scope,
2651 ifp->flags,
2652 ifp->idev->dev->name);
2653 return 0;
2654 }
2655
2656 static struct seq_operations if6_seq_ops = {
2657 .start = if6_seq_start,
2658 .next = if6_seq_next,
2659 .show = if6_seq_show,
2660 .stop = if6_seq_stop,
2661 };
2662
2663 static int if6_seq_open(struct inode *inode, struct file *file)
2664 {
2665 struct seq_file *seq;
2666 int rc = -ENOMEM;
2667 struct if6_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL);
2668
2669 if (!s)
2670 goto out;
2671 memset(s, 0, sizeof(*s));
2672
2673 rc = seq_open(file, &if6_seq_ops);
2674 if (rc)
2675 goto out_kfree;
2676
2677 seq = file->private_data;
2678 seq->private = s;
2679 out:
2680 return rc;
2681 out_kfree:
2682 kfree(s);
2683 goto out;
2684 }
2685
2686 static struct file_operations if6_fops = {
2687 .owner = THIS_MODULE,
2688 .open = if6_seq_open,
2689 .read = seq_read,
2690 .llseek = seq_lseek,
2691 .release = seq_release_private,
2692 };
2693
2694 int __init if6_proc_init(void)
2695 {
2696 if (!proc_net_fops_create("if_inet6", S_IRUGO, &if6_fops))
2697 return -ENOMEM;
2698 return 0;
2699 }
2700
2701 void if6_proc_exit(void)
2702 {
2703 proc_net_remove("if_inet6");
2704 }
2705 #endif /* CONFIG_PROC_FS */
2706
2707 /*
2708 * Periodic address status verification
2709 */
2710
2711 static void addrconf_verify(unsigned long foo)
2712 {
2713 struct inet6_ifaddr *ifp;
2714 unsigned long now, next;
2715 int i;
2716
2717 spin_lock_bh(&addrconf_verify_lock);
2718 now = jiffies;
2719 next = now + ADDR_CHECK_FREQUENCY;
2720
2721 del_timer(&addr_chk_timer);
2722
2723 for (i=0; i < IN6_ADDR_HSIZE; i++) {
2724
2725 restart:
2726 read_lock(&addrconf_hash_lock);
2727 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
2728 unsigned long age;
2729 #ifdef CONFIG_IPV6_PRIVACY
2730 unsigned long regen_advance;
2731 #endif
2732
2733 if (ifp->flags & IFA_F_PERMANENT)
2734 continue;
2735
2736 spin_lock(&ifp->lock);
2737 age = (now - ifp->tstamp) / HZ;
2738
2739 #ifdef CONFIG_IPV6_PRIVACY
2740 regen_advance = ifp->idev->cnf.regen_max_retry *
2741 ifp->idev->cnf.dad_transmits *
2742 ifp->idev->nd_parms->retrans_time / HZ;
2743 #endif
2744
2745 if (age >= ifp->valid_lft) {
2746 spin_unlock(&ifp->lock);
2747 in6_ifa_hold(ifp);
2748 read_unlock(&addrconf_hash_lock);
2749 ipv6_del_addr(ifp);
2750 goto restart;
2751 } else if (age >= ifp->prefered_lft) {
2752 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
2753 int deprecate = 0;
2754
2755 if (!(ifp->flags&IFA_F_DEPRECATED)) {
2756 deprecate = 1;
2757 ifp->flags |= IFA_F_DEPRECATED;
2758 }
2759
2760 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
2761 next = ifp->tstamp + ifp->valid_lft * HZ;
2762
2763 spin_unlock(&ifp->lock);
2764
2765 if (deprecate) {
2766 in6_ifa_hold(ifp);
2767 read_unlock(&addrconf_hash_lock);
2768
2769 ipv6_ifa_notify(0, ifp);
2770 in6_ifa_put(ifp);
2771 goto restart;
2772 }
2773 #ifdef CONFIG_IPV6_PRIVACY
2774 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
2775 !(ifp->flags&IFA_F_TENTATIVE)) {
2776 if (age >= ifp->prefered_lft - regen_advance) {
2777 struct inet6_ifaddr *ifpub = ifp->ifpub;
2778 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2779 next = ifp->tstamp + ifp->prefered_lft * HZ;
2780 if (!ifp->regen_count && ifpub) {
2781 ifp->regen_count++;
2782 in6_ifa_hold(ifp);
2783 in6_ifa_hold(ifpub);
2784 spin_unlock(&ifp->lock);
2785 read_unlock(&addrconf_hash_lock);
2786 spin_lock(&ifpub->lock);
2787 ifpub->regen_count = 0;
2788 spin_unlock(&ifpub->lock);
2789 ipv6_create_tempaddr(ifpub, ifp);
2790 in6_ifa_put(ifpub);
2791 in6_ifa_put(ifp);
2792 goto restart;
2793 }
2794 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
2795 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
2796 spin_unlock(&ifp->lock);
2797 #endif
2798 } else {
2799 /* ifp->prefered_lft <= ifp->valid_lft */
2800 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2801 next = ifp->tstamp + ifp->prefered_lft * HZ;
2802 spin_unlock(&ifp->lock);
2803 }
2804 }
2805 read_unlock(&addrconf_hash_lock);
2806 }
2807
2808 addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
2809 add_timer(&addr_chk_timer);
2810 spin_unlock_bh(&addrconf_verify_lock);
2811 }
2812
2813 static int
2814 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
2815 {
2816 struct rtattr **rta = arg;
2817 struct ifaddrmsg *ifm = NLMSG_DATA(nlh);
2818 struct in6_addr *pfx;
2819
2820 pfx = NULL;
2821 if (rta[IFA_ADDRESS-1]) {
2822 if (RTA_PAYLOAD(rta[IFA_ADDRESS-1]) < sizeof(*pfx))
2823 return -EINVAL;
2824 pfx = RTA_DATA(rta[IFA_ADDRESS-1]);
2825 }
2826 if (rta[IFA_LOCAL-1]) {
2827 if (pfx && memcmp(pfx, RTA_DATA(rta[IFA_LOCAL-1]), sizeof(*pfx)))
2828 return -EINVAL;
2829 pfx = RTA_DATA(rta[IFA_LOCAL-1]);
2830 }
2831 if (pfx == NULL)
2832 return -EINVAL;
2833
2834 return inet6_addr_del(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
2835 }
2836
2837 static int
2838 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
2839 {
2840 struct rtattr **rta = arg;
2841 struct ifaddrmsg *ifm = NLMSG_DATA(nlh);
2842 struct in6_addr *pfx;
2843
2844 pfx = NULL;
2845 if (rta[IFA_ADDRESS-1]) {
2846 if (RTA_PAYLOAD(rta[IFA_ADDRESS-1]) < sizeof(*pfx))
2847 return -EINVAL;
2848 pfx = RTA_DATA(rta[IFA_ADDRESS-1]);
2849 }
2850 if (rta[IFA_LOCAL-1]) {
2851 if (pfx && memcmp(pfx, RTA_DATA(rta[IFA_LOCAL-1]), sizeof(*pfx)))
2852 return -EINVAL;
2853 pfx = RTA_DATA(rta[IFA_LOCAL-1]);
2854 }
2855 if (pfx == NULL)
2856 return -EINVAL;
2857
2858 return inet6_addr_add(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
2859 }
2860
2861 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
2862 u32 pid, u32 seq, int event, unsigned int flags)
2863 {
2864 struct ifaddrmsg *ifm;
2865 struct nlmsghdr *nlh;
2866 struct ifa_cacheinfo ci;
2867 unsigned char *b = skb->tail;
2868
2869 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags);
2870 ifm = NLMSG_DATA(nlh);
2871 ifm->ifa_family = AF_INET6;
2872 ifm->ifa_prefixlen = ifa->prefix_len;
2873 ifm->ifa_flags = ifa->flags;
2874 ifm->ifa_scope = RT_SCOPE_UNIVERSE;
2875 if (ifa->scope&IFA_HOST)
2876 ifm->ifa_scope = RT_SCOPE_HOST;
2877 else if (ifa->scope&IFA_LINK)
2878 ifm->ifa_scope = RT_SCOPE_LINK;
2879 else if (ifa->scope&IFA_SITE)
2880 ifm->ifa_scope = RT_SCOPE_SITE;
2881 ifm->ifa_index = ifa->idev->dev->ifindex;
2882 RTA_PUT(skb, IFA_ADDRESS, 16, &ifa->addr);
2883 if (!(ifa->flags&IFA_F_PERMANENT)) {
2884 ci.ifa_prefered = ifa->prefered_lft;
2885 ci.ifa_valid = ifa->valid_lft;
2886 if (ci.ifa_prefered != INFINITY_LIFE_TIME) {
2887 long tval = (jiffies - ifa->tstamp)/HZ;
2888 ci.ifa_prefered -= tval;
2889 if (ci.ifa_valid != INFINITY_LIFE_TIME)
2890 ci.ifa_valid -= tval;
2891 }
2892 } else {
2893 ci.ifa_prefered = INFINITY_LIFE_TIME;
2894 ci.ifa_valid = INFINITY_LIFE_TIME;
2895 }
2896 ci.cstamp = (__u32)(TIME_DELTA(ifa->cstamp, INITIAL_JIFFIES) / HZ * 100
2897 + TIME_DELTA(ifa->cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
2898 ci.tstamp = (__u32)(TIME_DELTA(ifa->tstamp, INITIAL_JIFFIES) / HZ * 100
2899 + TIME_DELTA(ifa->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
2900 RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci);
2901 nlh->nlmsg_len = skb->tail - b;
2902 return skb->len;
2903
2904 nlmsg_failure:
2905 rtattr_failure:
2906 skb_trim(skb, b - skb->data);
2907 return -1;
2908 }
2909
2910 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
2911 u32 pid, u32 seq, int event, u16 flags)
2912 {
2913 struct ifaddrmsg *ifm;
2914 struct nlmsghdr *nlh;
2915 struct ifa_cacheinfo ci;
2916 unsigned char *b = skb->tail;
2917
2918 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags);
2919 ifm = NLMSG_DATA(nlh);
2920 ifm->ifa_family = AF_INET6;
2921 ifm->ifa_prefixlen = 128;
2922 ifm->ifa_flags = IFA_F_PERMANENT;
2923 ifm->ifa_scope = RT_SCOPE_UNIVERSE;
2924 if (ipv6_addr_scope(&ifmca->mca_addr)&IFA_SITE)
2925 ifm->ifa_scope = RT_SCOPE_SITE;
2926 ifm->ifa_index = ifmca->idev->dev->ifindex;
2927 RTA_PUT(skb, IFA_MULTICAST, 16, &ifmca->mca_addr);
2928 ci.cstamp = (__u32)(TIME_DELTA(ifmca->mca_cstamp, INITIAL_JIFFIES) / HZ
2929 * 100 + TIME_DELTA(ifmca->mca_cstamp, INITIAL_JIFFIES) % HZ
2930 * 100 / HZ);
2931 ci.tstamp = (__u32)(TIME_DELTA(ifmca->mca_tstamp, INITIAL_JIFFIES) / HZ
2932 * 100 + TIME_DELTA(ifmca->mca_tstamp, INITIAL_JIFFIES) % HZ
2933 * 100 / HZ);
2934 ci.ifa_prefered = INFINITY_LIFE_TIME;
2935 ci.ifa_valid = INFINITY_LIFE_TIME;
2936 RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci);
2937 nlh->nlmsg_len = skb->tail - b;
2938 return skb->len;
2939
2940 nlmsg_failure:
2941 rtattr_failure:
2942 skb_trim(skb, b - skb->data);
2943 return -1;
2944 }
2945
2946 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
2947 u32 pid, u32 seq, int event, unsigned int flags)
2948 {
2949 struct ifaddrmsg *ifm;
2950 struct nlmsghdr *nlh;
2951 struct ifa_cacheinfo ci;
2952 unsigned char *b = skb->tail;
2953
2954 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags);
2955 ifm = NLMSG_DATA(nlh);
2956 ifm->ifa_family = AF_INET6;
2957 ifm->ifa_prefixlen = 128;
2958 ifm->ifa_flags = IFA_F_PERMANENT;
2959 ifm->ifa_scope = RT_SCOPE_UNIVERSE;
2960 if (ipv6_addr_scope(&ifaca->aca_addr)&IFA_SITE)
2961 ifm->ifa_scope = RT_SCOPE_SITE;
2962 ifm->ifa_index = ifaca->aca_idev->dev->ifindex;
2963 RTA_PUT(skb, IFA_ANYCAST, 16, &ifaca->aca_addr);
2964 ci.cstamp = (__u32)(TIME_DELTA(ifaca->aca_cstamp, INITIAL_JIFFIES) / HZ
2965 * 100 + TIME_DELTA(ifaca->aca_cstamp, INITIAL_JIFFIES) % HZ
2966 * 100 / HZ);
2967 ci.tstamp = (__u32)(TIME_DELTA(ifaca->aca_tstamp, INITIAL_JIFFIES) / HZ
2968 * 100 + TIME_DELTA(ifaca->aca_tstamp, INITIAL_JIFFIES) % HZ
2969 * 100 / HZ);
2970 ci.ifa_prefered = INFINITY_LIFE_TIME;
2971 ci.ifa_valid = INFINITY_LIFE_TIME;
2972 RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci);
2973 nlh->nlmsg_len = skb->tail - b;
2974 return skb->len;
2975
2976 nlmsg_failure:
2977 rtattr_failure:
2978 skb_trim(skb, b - skb->data);
2979 return -1;
2980 }
2981
2982 enum addr_type_t
2983 {
2984 UNICAST_ADDR,
2985 MULTICAST_ADDR,
2986 ANYCAST_ADDR,
2987 };
2988
2989 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
2990 enum addr_type_t type)
2991 {
2992 int idx, ip_idx;
2993 int s_idx, s_ip_idx;
2994 int err = 1;
2995 struct net_device *dev;
2996 struct inet6_dev *idev = NULL;
2997 struct inet6_ifaddr *ifa;
2998 struct ifmcaddr6 *ifmca;
2999 struct ifacaddr6 *ifaca;
3000
3001 s_idx = cb->args[0];
3002 s_ip_idx = ip_idx = cb->args[1];
3003 read_lock(&dev_base_lock);
3004
3005 for (dev = dev_base, idx = 0; dev; dev = dev->next, idx++) {
3006 if (idx < s_idx)
3007 continue;
3008 if (idx > s_idx)
3009 s_ip_idx = 0;
3010 ip_idx = 0;
3011 if ((idev = in6_dev_get(dev)) == NULL)
3012 continue;
3013 read_lock_bh(&idev->lock);
3014 switch (type) {
3015 case UNICAST_ADDR:
3016 /* unicast address incl. temp addr */
3017 for (ifa = idev->addr_list; ifa;
3018 ifa = ifa->if_next, ip_idx++) {
3019 if (ip_idx < s_ip_idx)
3020 continue;
3021 if ((err = inet6_fill_ifaddr(skb, ifa,
3022 NETLINK_CB(cb->skb).pid,
3023 cb->nlh->nlmsg_seq, RTM_NEWADDR,
3024 NLM_F_MULTI)) <= 0)
3025 goto done;
3026 }
3027 break;
3028 case MULTICAST_ADDR:
3029 /* multicast address */
3030 for (ifmca = idev->mc_list; ifmca;
3031 ifmca = ifmca->next, ip_idx++) {
3032 if (ip_idx < s_ip_idx)
3033 continue;
3034 if ((err = inet6_fill_ifmcaddr(skb, ifmca,
3035 NETLINK_CB(cb->skb).pid,
3036 cb->nlh->nlmsg_seq, RTM_GETMULTICAST,
3037 NLM_F_MULTI)) <= 0)
3038 goto done;
3039 }
3040 break;
3041 case ANYCAST_ADDR:
3042 /* anycast address */
3043 for (ifaca = idev->ac_list; ifaca;
3044 ifaca = ifaca->aca_next, ip_idx++) {
3045 if (ip_idx < s_ip_idx)
3046 continue;
3047 if ((err = inet6_fill_ifacaddr(skb, ifaca,
3048 NETLINK_CB(cb->skb).pid,
3049 cb->nlh->nlmsg_seq, RTM_GETANYCAST,
3050 NLM_F_MULTI)) <= 0)
3051 goto done;
3052 }
3053 break;
3054 default:
3055 break;
3056 }
3057 read_unlock_bh(&idev->lock);
3058 in6_dev_put(idev);
3059 }
3060 done:
3061 if (err <= 0) {
3062 read_unlock_bh(&idev->lock);
3063 in6_dev_put(idev);
3064 }
3065 read_unlock(&dev_base_lock);
3066 cb->args[0] = idx;
3067 cb->args[1] = ip_idx;
3068 return skb->len;
3069 }
3070
3071 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3072 {
3073 enum addr_type_t type = UNICAST_ADDR;
3074 return inet6_dump_addr(skb, cb, type);
3075 }
3076
3077 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3078 {
3079 enum addr_type_t type = MULTICAST_ADDR;
3080 return inet6_dump_addr(skb, cb, type);
3081 }
3082
3083
3084 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3085 {
3086 enum addr_type_t type = ANYCAST_ADDR;
3087 return inet6_dump_addr(skb, cb, type);
3088 }
3089
3090 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3091 {
3092 struct sk_buff *skb;
3093 int size = NLMSG_SPACE(sizeof(struct ifaddrmsg)+128);
3094
3095 skb = alloc_skb(size, GFP_ATOMIC);
3096 if (!skb) {
3097 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFADDR, ENOBUFS);
3098 return;
3099 }
3100 if (inet6_fill_ifaddr(skb, ifa, current->pid, 0, event, 0) < 0) {
3101 kfree_skb(skb);
3102 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFADDR, EINVAL);
3103 return;
3104 }
3105 NETLINK_CB(skb).dst_group = RTNLGRP_IPV6_IFADDR;
3106 netlink_broadcast(rtnl, skb, 0, RTNLGRP_IPV6_IFADDR, GFP_ATOMIC);
3107 }
3108
3109 static void inline ipv6_store_devconf(struct ipv6_devconf *cnf,
3110 __s32 *array, int bytes)
3111 {
3112 memset(array, 0, bytes);
3113 array[DEVCONF_FORWARDING] = cnf->forwarding;
3114 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3115 array[DEVCONF_MTU6] = cnf->mtu6;
3116 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3117 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3118 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3119 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3120 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3121 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3122 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3123 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3124 #ifdef CONFIG_IPV6_PRIVACY
3125 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3126 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3127 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3128 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3129 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3130 #endif
3131 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3132 }
3133
3134 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3135 u32 pid, u32 seq, int event, unsigned int flags)
3136 {
3137 struct net_device *dev = idev->dev;
3138 __s32 *array = NULL;
3139 struct ifinfomsg *r;
3140 struct nlmsghdr *nlh;
3141 unsigned char *b = skb->tail;
3142 struct rtattr *subattr;
3143 __u32 mtu = dev->mtu;
3144 struct ifla_cacheinfo ci;
3145
3146 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*r), flags);
3147 r = NLMSG_DATA(nlh);
3148 r->ifi_family = AF_INET6;
3149 r->__ifi_pad = 0;
3150 r->ifi_type = dev->type;
3151 r->ifi_index = dev->ifindex;
3152 r->ifi_flags = dev_get_flags(dev);
3153 r->ifi_change = 0;
3154
3155 RTA_PUT(skb, IFLA_IFNAME, strlen(dev->name)+1, dev->name);
3156
3157 if (dev->addr_len)
3158 RTA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3159
3160 RTA_PUT(skb, IFLA_MTU, sizeof(mtu), &mtu);
3161 if (dev->ifindex != dev->iflink)
3162 RTA_PUT(skb, IFLA_LINK, sizeof(int), &dev->iflink);
3163
3164 subattr = (struct rtattr*)skb->tail;
3165
3166 RTA_PUT(skb, IFLA_PROTINFO, 0, NULL);
3167
3168 /* return the device flags */
3169 RTA_PUT(skb, IFLA_INET6_FLAGS, sizeof(__u32), &idev->if_flags);
3170
3171 /* return interface cacheinfo */
3172 ci.max_reasm_len = IPV6_MAXPLEN;
3173 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3174 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3175 ci.reachable_time = idev->nd_parms->reachable_time;
3176 ci.retrans_time = idev->nd_parms->retrans_time;
3177 RTA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3178
3179 /* return the device sysctl params */
3180 if ((array = kmalloc(DEVCONF_MAX * sizeof(*array), GFP_ATOMIC)) == NULL)
3181 goto rtattr_failure;
3182 ipv6_store_devconf(&idev->cnf, array, DEVCONF_MAX * sizeof(*array));
3183 RTA_PUT(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(*array), array);
3184
3185 /* XXX - Statistics/MC not implemented */
3186 subattr->rta_len = skb->tail - (u8*)subattr;
3187
3188 nlh->nlmsg_len = skb->tail - b;
3189 kfree(array);
3190 return skb->len;
3191
3192 nlmsg_failure:
3193 rtattr_failure:
3194 kfree(array);
3195 skb_trim(skb, b - skb->data);
3196 return -1;
3197 }
3198
3199 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3200 {
3201 int idx, err;
3202 int s_idx = cb->args[0];
3203 struct net_device *dev;
3204 struct inet6_dev *idev;
3205
3206 read_lock(&dev_base_lock);
3207 for (dev=dev_base, idx=0; dev; dev = dev->next, idx++) {
3208 if (idx < s_idx)
3209 continue;
3210 if ((idev = in6_dev_get(dev)) == NULL)
3211 continue;
3212 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
3213 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
3214 in6_dev_put(idev);
3215 if (err <= 0)
3216 break;
3217 }
3218 read_unlock(&dev_base_lock);
3219 cb->args[0] = idx;
3220
3221 return skb->len;
3222 }
3223
3224 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3225 {
3226 struct sk_buff *skb;
3227 /* 128 bytes ?? */
3228 int size = NLMSG_SPACE(sizeof(struct ifinfomsg)+128);
3229
3230 skb = alloc_skb(size, GFP_ATOMIC);
3231 if (!skb) {
3232 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFINFO, ENOBUFS);
3233 return;
3234 }
3235 if (inet6_fill_ifinfo(skb, idev, current->pid, 0, event, 0) < 0) {
3236 kfree_skb(skb);
3237 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFINFO, EINVAL);
3238 return;
3239 }
3240 NETLINK_CB(skb).dst_group = RTNLGRP_IPV6_IFINFO;
3241 netlink_broadcast(rtnl, skb, 0, RTNLGRP_IPV6_IFINFO, GFP_ATOMIC);
3242 }
3243
3244 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
3245 struct prefix_info *pinfo, u32 pid, u32 seq,
3246 int event, unsigned int flags)
3247 {
3248 struct prefixmsg *pmsg;
3249 struct nlmsghdr *nlh;
3250 unsigned char *b = skb->tail;
3251 struct prefix_cacheinfo ci;
3252
3253 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*pmsg), flags);
3254 pmsg = NLMSG_DATA(nlh);
3255 pmsg->prefix_family = AF_INET6;
3256 pmsg->prefix_pad1 = 0;
3257 pmsg->prefix_pad2 = 0;
3258 pmsg->prefix_ifindex = idev->dev->ifindex;
3259 pmsg->prefix_len = pinfo->prefix_len;
3260 pmsg->prefix_type = pinfo->type;
3261 pmsg->prefix_pad3 = 0;
3262
3263 pmsg->prefix_flags = 0;
3264 if (pinfo->onlink)
3265 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3266 if (pinfo->autoconf)
3267 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3268
3269 RTA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
3270
3271 ci.preferred_time = ntohl(pinfo->prefered);
3272 ci.valid_time = ntohl(pinfo->valid);
3273 RTA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
3274
3275 nlh->nlmsg_len = skb->tail - b;
3276 return skb->len;
3277
3278 nlmsg_failure:
3279 rtattr_failure:
3280 skb_trim(skb, b - skb->data);
3281 return -1;
3282 }
3283
3284 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
3285 struct prefix_info *pinfo)
3286 {
3287 struct sk_buff *skb;
3288 int size = NLMSG_SPACE(sizeof(struct prefixmsg)+128);
3289
3290 skb = alloc_skb(size, GFP_ATOMIC);
3291 if (!skb) {
3292 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_PREFIX, ENOBUFS);
3293 return;
3294 }
3295 if (inet6_fill_prefix(skb, idev, pinfo, current->pid, 0, event, 0) < 0) {
3296 kfree_skb(skb);
3297 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_PREFIX, EINVAL);
3298 return;
3299 }
3300 NETLINK_CB(skb).dst_group = RTNLGRP_IPV6_PREFIX;
3301 netlink_broadcast(rtnl, skb, 0, RTNLGRP_IPV6_PREFIX, GFP_ATOMIC);
3302 }
3303
3304 static struct rtnetlink_link inet6_rtnetlink_table[RTM_NR_MSGTYPES] = {
3305 [RTM_GETLINK - RTM_BASE] = { .dumpit = inet6_dump_ifinfo, },
3306 [RTM_NEWADDR - RTM_BASE] = { .doit = inet6_rtm_newaddr, },
3307 [RTM_DELADDR - RTM_BASE] = { .doit = inet6_rtm_deladdr, },
3308 [RTM_GETADDR - RTM_BASE] = { .dumpit = inet6_dump_ifaddr, },
3309 [RTM_GETMULTICAST - RTM_BASE] = { .dumpit = inet6_dump_ifmcaddr, },
3310 [RTM_GETANYCAST - RTM_BASE] = { .dumpit = inet6_dump_ifacaddr, },
3311 [RTM_NEWROUTE - RTM_BASE] = { .doit = inet6_rtm_newroute, },
3312 [RTM_DELROUTE - RTM_BASE] = { .doit = inet6_rtm_delroute, },
3313 [RTM_GETROUTE - RTM_BASE] = { .doit = inet6_rtm_getroute,
3314 .dumpit = inet6_dump_fib, },
3315 };
3316
3317 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3318 {
3319 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3320
3321 switch (event) {
3322 case RTM_NEWADDR:
3323 dst_hold(&ifp->rt->u.dst);
3324 if (ip6_ins_rt(ifp->rt, NULL, NULL, NULL))
3325 dst_release(&ifp->rt->u.dst);
3326 if (ifp->idev->cnf.forwarding)
3327 addrconf_join_anycast(ifp);
3328 break;
3329 case RTM_DELADDR:
3330 if (ifp->idev->cnf.forwarding)
3331 addrconf_leave_anycast(ifp);
3332 addrconf_leave_solict(ifp->idev, &ifp->addr);
3333 dst_hold(&ifp->rt->u.dst);
3334 if (ip6_del_rt(ifp->rt, NULL, NULL, NULL))
3335 dst_free(&ifp->rt->u.dst);
3336 else
3337 dst_release(&ifp->rt->u.dst);
3338 break;
3339 }
3340 }
3341
3342 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3343 {
3344 read_lock_bh(&addrconf_lock);
3345 if (likely(ifp->idev->dead == 0))
3346 __ipv6_ifa_notify(event, ifp);
3347 read_unlock_bh(&addrconf_lock);
3348 }
3349
3350 #ifdef CONFIG_SYSCTL
3351
3352 static
3353 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3354 void __user *buffer, size_t *lenp, loff_t *ppos)
3355 {
3356 int *valp = ctl->data;
3357 int val = *valp;
3358 int ret;
3359
3360 ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3361
3362 if (write && valp != &ipv6_devconf_dflt.forwarding) {
3363 if (valp != &ipv6_devconf.forwarding) {
3364 if ((!*valp) ^ (!val)) {
3365 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
3366 if (idev == NULL)
3367 return ret;
3368 dev_forward_change(idev);
3369 }
3370 } else {
3371 ipv6_devconf_dflt.forwarding = ipv6_devconf.forwarding;
3372 addrconf_forward_change();
3373 }
3374 if (*valp)
3375 rt6_purge_dflt_routers();
3376 }
3377
3378 return ret;
3379 }
3380
3381 static int addrconf_sysctl_forward_strategy(ctl_table *table,
3382 int __user *name, int nlen,
3383 void __user *oldval,
3384 size_t __user *oldlenp,
3385 void __user *newval, size_t newlen,
3386 void **context)
3387 {
3388 int *valp = table->data;
3389 int new;
3390
3391 if (!newval || !newlen)
3392 return 0;
3393 if (newlen != sizeof(int))
3394 return -EINVAL;
3395 if (get_user(new, (int __user *)newval))
3396 return -EFAULT;
3397 if (new == *valp)
3398 return 0;
3399 if (oldval && oldlenp) {
3400 size_t len;
3401 if (get_user(len, oldlenp))
3402 return -EFAULT;
3403 if (len) {
3404 if (len > table->maxlen)
3405 len = table->maxlen;
3406 if (copy_to_user(oldval, valp, len))
3407 return -EFAULT;
3408 if (put_user(len, oldlenp))
3409 return -EFAULT;
3410 }
3411 }
3412
3413 if (valp != &ipv6_devconf_dflt.forwarding) {
3414 if (valp != &ipv6_devconf.forwarding) {
3415 struct inet6_dev *idev = (struct inet6_dev *)table->extra1;
3416 int changed;
3417 if (unlikely(idev == NULL))
3418 return -ENODEV;
3419 changed = (!*valp) ^ (!new);
3420 *valp = new;
3421 if (changed)
3422 dev_forward_change(idev);
3423 } else {
3424 *valp = new;
3425 addrconf_forward_change();
3426 }
3427
3428 if (*valp)
3429 rt6_purge_dflt_routers();
3430 } else
3431 *valp = new;
3432
3433 return 1;
3434 }
3435
3436 static struct addrconf_sysctl_table
3437 {
3438 struct ctl_table_header *sysctl_header;
3439 ctl_table addrconf_vars[__NET_IPV6_MAX];
3440 ctl_table addrconf_dev[2];
3441 ctl_table addrconf_conf_dir[2];
3442 ctl_table addrconf_proto_dir[2];
3443 ctl_table addrconf_root_dir[2];
3444 } addrconf_sysctl = {
3445 .sysctl_header = NULL,
3446 .addrconf_vars = {
3447 {
3448 .ctl_name = NET_IPV6_FORWARDING,
3449 .procname = "forwarding",
3450 .data = &ipv6_devconf.forwarding,
3451 .maxlen = sizeof(int),
3452 .mode = 0644,
3453 .proc_handler = &addrconf_sysctl_forward,
3454 .strategy = &addrconf_sysctl_forward_strategy,
3455 },
3456 {
3457 .ctl_name = NET_IPV6_HOP_LIMIT,
3458 .procname = "hop_limit",
3459 .data = &ipv6_devconf.hop_limit,
3460 .maxlen = sizeof(int),
3461 .mode = 0644,
3462 .proc_handler = proc_dointvec,
3463 },
3464 {
3465 .ctl_name = NET_IPV6_MTU,
3466 .procname = "mtu",
3467 .data = &ipv6_devconf.mtu6,
3468 .maxlen = sizeof(int),
3469 .mode = 0644,
3470 .proc_handler = &proc_dointvec,
3471 },
3472 {
3473 .ctl_name = NET_IPV6_ACCEPT_RA,
3474 .procname = "accept_ra",
3475 .data = &ipv6_devconf.accept_ra,
3476 .maxlen = sizeof(int),
3477 .mode = 0644,
3478 .proc_handler = &proc_dointvec,
3479 },
3480 {
3481 .ctl_name = NET_IPV6_ACCEPT_REDIRECTS,
3482 .procname = "accept_redirects",
3483 .data = &ipv6_devconf.accept_redirects,
3484 .maxlen = sizeof(int),
3485 .mode = 0644,
3486 .proc_handler = &proc_dointvec,
3487 },
3488 {
3489 .ctl_name = NET_IPV6_AUTOCONF,
3490 .procname = "autoconf",
3491 .data = &ipv6_devconf.autoconf,
3492 .maxlen = sizeof(int),
3493 .mode = 0644,
3494 .proc_handler = &proc_dointvec,
3495 },
3496 {
3497 .ctl_name = NET_IPV6_DAD_TRANSMITS,
3498 .procname = "dad_transmits",
3499 .data = &ipv6_devconf.dad_transmits,
3500 .maxlen = sizeof(int),
3501 .mode = 0644,
3502 .proc_handler = &proc_dointvec,
3503 },
3504 {
3505 .ctl_name = NET_IPV6_RTR_SOLICITS,
3506 .procname = "router_solicitations",
3507 .data = &ipv6_devconf.rtr_solicits,
3508 .maxlen = sizeof(int),
3509 .mode = 0644,
3510 .proc_handler = &proc_dointvec,
3511 },
3512 {
3513 .ctl_name = NET_IPV6_RTR_SOLICIT_INTERVAL,
3514 .procname = "router_solicitation_interval",
3515 .data = &ipv6_devconf.rtr_solicit_interval,
3516 .maxlen = sizeof(int),
3517 .mode = 0644,
3518 .proc_handler = &proc_dointvec_jiffies,
3519 .strategy = &sysctl_jiffies,
3520 },
3521 {
3522 .ctl_name = NET_IPV6_RTR_SOLICIT_DELAY,
3523 .procname = "router_solicitation_delay",
3524 .data = &ipv6_devconf.rtr_solicit_delay,
3525 .maxlen = sizeof(int),
3526 .mode = 0644,
3527 .proc_handler = &proc_dointvec_jiffies,
3528 .strategy = &sysctl_jiffies,
3529 },
3530 {
3531 .ctl_name = NET_IPV6_FORCE_MLD_VERSION,
3532 .procname = "force_mld_version",
3533 .data = &ipv6_devconf.force_mld_version,
3534 .maxlen = sizeof(int),
3535 .mode = 0644,
3536 .proc_handler = &proc_dointvec,
3537 },
3538 #ifdef CONFIG_IPV6_PRIVACY
3539 {
3540 .ctl_name = NET_IPV6_USE_TEMPADDR,
3541 .procname = "use_tempaddr",
3542 .data = &ipv6_devconf.use_tempaddr,
3543 .maxlen = sizeof(int),
3544 .mode = 0644,
3545 .proc_handler = &proc_dointvec,
3546 },
3547 {
3548 .ctl_name = NET_IPV6_TEMP_VALID_LFT,
3549 .procname = "temp_valid_lft",
3550 .data = &ipv6_devconf.temp_valid_lft,
3551 .maxlen = sizeof(int),
3552 .mode = 0644,
3553 .proc_handler = &proc_dointvec,
3554 },
3555 {
3556 .ctl_name = NET_IPV6_TEMP_PREFERED_LFT,
3557 .procname = "temp_prefered_lft",
3558 .data = &ipv6_devconf.temp_prefered_lft,
3559 .maxlen = sizeof(int),
3560 .mode = 0644,
3561 .proc_handler = &proc_dointvec,
3562 },
3563 {
3564 .ctl_name = NET_IPV6_REGEN_MAX_RETRY,
3565 .procname = "regen_max_retry",
3566 .data = &ipv6_devconf.regen_max_retry,
3567 .maxlen = sizeof(int),
3568 .mode = 0644,
3569 .proc_handler = &proc_dointvec,
3570 },
3571 {
3572 .ctl_name = NET_IPV6_MAX_DESYNC_FACTOR,
3573 .procname = "max_desync_factor",
3574 .data = &ipv6_devconf.max_desync_factor,
3575 .maxlen = sizeof(int),
3576 .mode = 0644,
3577 .proc_handler = &proc_dointvec,
3578 },
3579 #endif
3580 {
3581 .ctl_name = NET_IPV6_MAX_ADDRESSES,
3582 .procname = "max_addresses",
3583 .data = &ipv6_devconf.max_addresses,
3584 .maxlen = sizeof(int),
3585 .mode = 0644,
3586 .proc_handler = &proc_dointvec,
3587 },
3588 {
3589 .ctl_name = 0, /* sentinel */
3590 }
3591 },
3592 .addrconf_dev = {
3593 {
3594 .ctl_name = NET_PROTO_CONF_ALL,
3595 .procname = "all",
3596 .mode = 0555,
3597 .child = addrconf_sysctl.addrconf_vars,
3598 },
3599 {
3600 .ctl_name = 0, /* sentinel */
3601 }
3602 },
3603 .addrconf_conf_dir = {
3604 {
3605 .ctl_name = NET_IPV6_CONF,
3606 .procname = "conf",
3607 .mode = 0555,
3608 .child = addrconf_sysctl.addrconf_dev,
3609 },
3610 {
3611 .ctl_name = 0, /* sentinel */
3612 }
3613 },
3614 .addrconf_proto_dir = {
3615 {
3616 .ctl_name = NET_IPV6,
3617 .procname = "ipv6",
3618 .mode = 0555,
3619 .child = addrconf_sysctl.addrconf_conf_dir,
3620 },
3621 {
3622 .ctl_name = 0, /* sentinel */
3623 }
3624 },
3625 .addrconf_root_dir = {
3626 {
3627 .ctl_name = CTL_NET,
3628 .procname = "net",
3629 .mode = 0555,
3630 .child = addrconf_sysctl.addrconf_proto_dir,
3631 },
3632 {
3633 .ctl_name = 0, /* sentinel */
3634 }
3635 },
3636 };
3637
3638 static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p)
3639 {
3640 int i;
3641 struct net_device *dev = idev ? idev->dev : NULL;
3642 struct addrconf_sysctl_table *t;
3643 char *dev_name = NULL;
3644
3645 t = kmalloc(sizeof(*t), GFP_KERNEL);
3646 if (t == NULL)
3647 return;
3648 memcpy(t, &addrconf_sysctl, sizeof(*t));
3649 for (i=0; t->addrconf_vars[i].data; i++) {
3650 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
3651 t->addrconf_vars[i].de = NULL;
3652 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
3653 }
3654 if (dev) {
3655 dev_name = dev->name;
3656 t->addrconf_dev[0].ctl_name = dev->ifindex;
3657 } else {
3658 dev_name = "default";
3659 t->addrconf_dev[0].ctl_name = NET_PROTO_CONF_DEFAULT;
3660 }
3661
3662 /*
3663 * Make a copy of dev_name, because '.procname' is regarded as const
3664 * by sysctl and we wouldn't want anyone to change it under our feet
3665 * (see SIOCSIFNAME).
3666 */
3667 dev_name = kstrdup(dev_name, GFP_KERNEL);
3668 if (!dev_name)
3669 goto free;
3670
3671 t->addrconf_dev[0].procname = dev_name;
3672
3673 t->addrconf_dev[0].child = t->addrconf_vars;
3674 t->addrconf_dev[0].de = NULL;
3675 t->addrconf_conf_dir[0].child = t->addrconf_dev;
3676 t->addrconf_conf_dir[0].de = NULL;
3677 t->addrconf_proto_dir[0].child = t->addrconf_conf_dir;
3678 t->addrconf_proto_dir[0].de = NULL;
3679 t->addrconf_root_dir[0].child = t->addrconf_proto_dir;
3680 t->addrconf_root_dir[0].de = NULL;
3681
3682 t->sysctl_header = register_sysctl_table(t->addrconf_root_dir, 0);
3683 if (t->sysctl_header == NULL)
3684 goto free_procname;
3685 else
3686 p->sysctl = t;
3687 return;
3688
3689 /* error path */
3690 free_procname:
3691 kfree(dev_name);
3692 free:
3693 kfree(t);
3694
3695 return;
3696 }
3697
3698 static void addrconf_sysctl_unregister(struct ipv6_devconf *p)
3699 {
3700 if (p->sysctl) {
3701 struct addrconf_sysctl_table *t = p->sysctl;
3702 p->sysctl = NULL;
3703 unregister_sysctl_table(t->sysctl_header);
3704 kfree(t->addrconf_dev[0].procname);
3705 kfree(t);
3706 }
3707 }
3708
3709
3710 #endif
3711
3712 /*
3713 * Device notifier
3714 */
3715
3716 int register_inet6addr_notifier(struct notifier_block *nb)
3717 {
3718 return notifier_chain_register(&inet6addr_chain, nb);
3719 }
3720
3721 int unregister_inet6addr_notifier(struct notifier_block *nb)
3722 {
3723 return notifier_chain_unregister(&inet6addr_chain,nb);
3724 }
3725
3726 /*
3727 * Init / cleanup code
3728 */
3729
3730 int __init addrconf_init(void)
3731 {
3732 int err = 0;
3733
3734 /* The addrconf netdev notifier requires that loopback_dev
3735 * has it's ipv6 private information allocated and setup
3736 * before it can bring up and give link-local addresses
3737 * to other devices which are up.
3738 *
3739 * Unfortunately, loopback_dev is not necessarily the first
3740 * entry in the global dev_base list of net devices. In fact,
3741 * it is likely to be the very last entry on that list.
3742 * So this causes the notifier registry below to try and
3743 * give link-local addresses to all devices besides loopback_dev
3744 * first, then loopback_dev, which cases all the non-loopback_dev
3745 * devices to fail to get a link-local address.
3746 *
3747 * So, as a temporary fix, allocate the ipv6 structure for
3748 * loopback_dev first by hand.
3749 * Longer term, all of the dependencies ipv6 has upon the loopback
3750 * device and it being up should be removed.
3751 */
3752 rtnl_lock();
3753 if (!ipv6_add_dev(&loopback_dev))
3754 err = -ENOMEM;
3755 rtnl_unlock();
3756 if (err)
3757 return err;
3758
3759 ip6_null_entry.rt6i_idev = in6_dev_get(&loopback_dev);
3760
3761 register_netdevice_notifier(&ipv6_dev_notf);
3762
3763 #ifdef CONFIG_IPV6_PRIVACY
3764 md5_tfm = crypto_alloc_tfm("md5", 0);
3765 if (unlikely(md5_tfm == NULL))
3766 printk(KERN_WARNING
3767 "failed to load transform for md5\n");
3768 #endif
3769
3770 addrconf_verify(0);
3771 rtnetlink_links[PF_INET6] = inet6_rtnetlink_table;
3772 #ifdef CONFIG_SYSCTL
3773 addrconf_sysctl.sysctl_header =
3774 register_sysctl_table(addrconf_sysctl.addrconf_root_dir, 0);
3775 addrconf_sysctl_register(NULL, &ipv6_devconf_dflt);
3776 #endif
3777
3778 return 0;
3779 }
3780
3781 void __exit addrconf_cleanup(void)
3782 {
3783 struct net_device *dev;
3784 struct inet6_dev *idev;
3785 struct inet6_ifaddr *ifa;
3786 int i;
3787
3788 unregister_netdevice_notifier(&ipv6_dev_notf);
3789
3790 rtnetlink_links[PF_INET6] = NULL;
3791 #ifdef CONFIG_SYSCTL
3792 addrconf_sysctl_unregister(&ipv6_devconf_dflt);
3793 addrconf_sysctl_unregister(&ipv6_devconf);
3794 #endif
3795
3796 rtnl_lock();
3797
3798 /*
3799 * clean dev list.
3800 */
3801
3802 for (dev=dev_base; dev; dev=dev->next) {
3803 if ((idev = __in6_dev_get(dev)) == NULL)
3804 continue;
3805 addrconf_ifdown(dev, 1);
3806 }
3807 addrconf_ifdown(&loopback_dev, 2);
3808
3809 /*
3810 * Check hash table.
3811 */
3812
3813 write_lock_bh(&addrconf_hash_lock);
3814 for (i=0; i < IN6_ADDR_HSIZE; i++) {
3815 for (ifa=inet6_addr_lst[i]; ifa; ) {
3816 struct inet6_ifaddr *bifa;
3817
3818 bifa = ifa;
3819 ifa = ifa->lst_next;
3820 printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
3821 /* Do not free it; something is wrong.
3822 Now we can investigate it with debugger.
3823 */
3824 }
3825 }
3826 write_unlock_bh(&addrconf_hash_lock);
3827
3828 del_timer(&addr_chk_timer);
3829
3830 rtnl_unlock();
3831
3832 #ifdef CONFIG_IPV6_PRIVACY
3833 crypto_free_tfm(md5_tfm);
3834 md5_tfm = NULL;
3835 #endif
3836
3837 #ifdef CONFIG_PROC_FS
3838 proc_net_remove("if_inet6");
3839 #endif
3840 }
Linux with added FPC-III support