1 /*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
9 * $Id: addrconf.c,v 1.69 2001/10/31 21:55:54 davem Exp $
10 *
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License
13 * as published by the Free Software Foundation; either version
14 * 2 of the License, or (at your option) any later version.
15 */
16
17 /*
18 * Changes:
19 *
20 * Janos Farkas : delete timer on ifdown
21 * <chexum@bankinf.banki.hu>
22 * Andi Kleen : kill double kfree on module
23 * unload.
24 * Maciej W. Rozycki : FDDI support
25 * sekiya@USAGI : Don't send too many RS
26 * packets.
27 * yoshfuji@USAGI : Fixed interval between DAD
28 * packets.
29 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
30 * address validation timer.
31 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
32 * support.
33 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
34 * address on a same interface.
35 * YOSHIFUJI Hideaki @USAGI : ARCnet support
36 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
37 * seq_file.
38 */
39
40 #include <linux/config.h>
41 #include <linux/errno.h>
42 #include <linux/types.h>
43 #include <linux/socket.h>
44 #include <linux/sockios.h>
45 #include <linux/sched.h>
46 #include <linux/net.h>
47 #include <linux/in6.h>
48 #include <linux/netdevice.h>
49 #include <linux/if_arp.h>
50 #include <linux/if_arcnet.h>
51 #include <linux/if_infiniband.h>
52 #include <linux/route.h>
53 #include <linux/inetdevice.h>
54 #include <linux/init.h>
55 #ifdef CONFIG_SYSCTL
56 #include <linux/sysctl.h>
57 #endif
58 #include <linux/delay.h>
59 #include <linux/notifier.h>
60
61 #include <net/sock.h>
62 #include <net/snmp.h>
63
64 #include <net/ipv6.h>
65 #include <net/protocol.h>
66 #include <net/ndisc.h>
67 #include <net/ip6_route.h>
68 #include <net/addrconf.h>
69 #include <net/tcp.h>
70 #include <net/ip.h>
71 #include <linux/if_tunnel.h>
72 #include <linux/rtnetlink.h>
73
74 #ifdef CONFIG_IPV6_PRIVACY
75 #include <linux/random.h>
76 #include <linux/crypto.h>
77 #include <asm/scatterlist.h>
78 #endif
79
80 #include <asm/uaccess.h>
81
82 #include <linux/proc_fs.h>
83 #include <linux/seq_file.h>
84
85 /* Set to 3 to get tracing... */
86 #define ACONF_DEBUG 2
87
88 #if ACONF_DEBUG >= 3
89 #define ADBG(x) printk x
90 #else
91 #define ADBG(x)
92 #endif
93
94 #define INFINITY_LIFE_TIME 0xFFFFFFFF
95 #define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b)))
96
97 #ifdef CONFIG_SYSCTL
98 static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p);
99 static void addrconf_sysctl_unregister(struct ipv6_devconf *p);
100 #endif
101
102 #ifdef CONFIG_IPV6_PRIVACY
103 static int __ipv6_regen_rndid(struct inet6_dev *idev);
104 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
105 static void ipv6_regen_rndid(unsigned long data);
106
107 static int desync_factor = MAX_DESYNC_FACTOR * HZ;
108 static struct crypto_tfm *md5_tfm;
109 static DEFINE_SPINLOCK(md5_tfm_lock);
110 #endif
111
112 static int ipv6_count_addresses(struct inet6_dev *idev);
113
114 /*
115 * Configured unicast address hash table
116 */
117 static struct inet6_ifaddr *inet6_addr_lst[IN6_ADDR_HSIZE];
118 static DEFINE_RWLOCK(addrconf_hash_lock);
119
120 /* Protects inet6 devices */
121 DEFINE_RWLOCK(addrconf_lock);
122
123 static void addrconf_verify(unsigned long);
124
125 static struct timer_list addr_chk_timer =
126 TIMER_INITIALIZER(addrconf_verify, 0, 0);
127 static DEFINE_SPINLOCK(addrconf_verify_lock);
128
129 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
130 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
131
132 static int addrconf_ifdown(struct net_device *dev, int how);
133
134 static void addrconf_dad_start(struct inet6_ifaddr *ifp, int flags);
135 static void addrconf_dad_timer(unsigned long data);
136 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
137 static void addrconf_rs_timer(unsigned long data);
138 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
139 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
140
141 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
142 struct prefix_info *pinfo);
143 static int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev);
144
145 static struct notifier_block *inet6addr_chain;
146
147 struct ipv6_devconf ipv6_devconf = {
148 .forwarding = 0,
149 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
150 .mtu6 = IPV6_MIN_MTU,
151 .accept_ra = 1,
152 .accept_redirects = 1,
153 .autoconf = 1,
154 .force_mld_version = 0,
155 .dad_transmits = 1,
156 .rtr_solicits = MAX_RTR_SOLICITATIONS,
157 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
158 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
159 #ifdef CONFIG_IPV6_PRIVACY
160 .use_tempaddr = 0,
161 .temp_valid_lft = TEMP_VALID_LIFETIME,
162 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
163 .regen_max_retry = REGEN_MAX_RETRY,
164 .max_desync_factor = MAX_DESYNC_FACTOR,
165 #endif
166 .max_addresses = IPV6_MAX_ADDRESSES,
167 };
168
169 static struct ipv6_devconf ipv6_devconf_dflt = {
170 .forwarding = 0,
171 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
172 .mtu6 = IPV6_MIN_MTU,
173 .accept_ra = 1,
174 .accept_redirects = 1,
175 .autoconf = 1,
176 .dad_transmits = 1,
177 .rtr_solicits = MAX_RTR_SOLICITATIONS,
178 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
179 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
180 #ifdef CONFIG_IPV6_PRIVACY
181 .use_tempaddr = 0,
182 .temp_valid_lft = TEMP_VALID_LIFETIME,
183 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
184 .regen_max_retry = REGEN_MAX_RETRY,
185 .max_desync_factor = MAX_DESYNC_FACTOR,
186 #endif
187 .max_addresses = IPV6_MAX_ADDRESSES,
188 };
189
190 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
191 #if 0
192 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
193 #endif
194 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
195
196 int ipv6_addr_type(const struct in6_addr *addr)
197 {
198 int type;
199 u32 st;
200
201 st = addr->s6_addr32[0];
202
203 if ((st & htonl(0xFF000000)) == htonl(0xFF000000)) {
204 type = IPV6_ADDR_MULTICAST;
205
206 switch((st & htonl(0x00FF0000))) {
207 case __constant_htonl(0x00010000):
208 type |= IPV6_ADDR_LOOPBACK;
209 break;
210
211 case __constant_htonl(0x00020000):
212 type |= IPV6_ADDR_LINKLOCAL;
213 break;
214
215 case __constant_htonl(0x00050000):
216 type |= IPV6_ADDR_SITELOCAL;
217 break;
218 };
219 return type;
220 }
221
222 type = IPV6_ADDR_UNICAST;
223
224 /* Consider all addresses with the first three bits different of
225 000 and 111 as finished.
226 */
227 if ((st & htonl(0xE0000000)) != htonl(0x00000000) &&
228 (st & htonl(0xE0000000)) != htonl(0xE0000000))
229 return type;
230
231 if ((st & htonl(0xFFC00000)) == htonl(0xFE800000))
232 return (IPV6_ADDR_LINKLOCAL | type);
233
234 if ((st & htonl(0xFFC00000)) == htonl(0xFEC00000))
235 return (IPV6_ADDR_SITELOCAL | type);
236
237 if ((addr->s6_addr32[0] | addr->s6_addr32[1]) == 0) {
238 if (addr->s6_addr32[2] == 0) {
239 if (addr->s6_addr32[3] == 0)
240 return IPV6_ADDR_ANY;
241
242 if (addr->s6_addr32[3] == htonl(0x00000001))
243 return (IPV6_ADDR_LOOPBACK | type);
244
245 return (IPV6_ADDR_COMPATv4 | type);
246 }
247
248 if (addr->s6_addr32[2] == htonl(0x0000ffff))
249 return IPV6_ADDR_MAPPED;
250 }
251
252 st &= htonl(0xFF000000);
253 if (st == 0)
254 return IPV6_ADDR_RESERVED;
255 st &= htonl(0xFE000000);
256 if (st == htonl(0x02000000))
257 return IPV6_ADDR_RESERVED; /* for NSAP */
258 if (st == htonl(0x04000000))
259 return IPV6_ADDR_RESERVED; /* for IPX */
260 return type;
261 }
262
263 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
264 {
265 if (del_timer(&ifp->timer))
266 __in6_ifa_put(ifp);
267 }
268
269 enum addrconf_timer_t
270 {
271 AC_NONE,
272 AC_DAD,
273 AC_RS,
274 };
275
276 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
277 enum addrconf_timer_t what,
278 unsigned long when)
279 {
280 if (!del_timer(&ifp->timer))
281 in6_ifa_hold(ifp);
282
283 switch (what) {
284 case AC_DAD:
285 ifp->timer.function = addrconf_dad_timer;
286 break;
287 case AC_RS:
288 ifp->timer.function = addrconf_rs_timer;
289 break;
290 default:;
291 }
292 ifp->timer.expires = jiffies + when;
293 add_timer(&ifp->timer);
294 }
295
296 /* Nobody refers to this device, we may destroy it. */
297
298 void in6_dev_finish_destroy(struct inet6_dev *idev)
299 {
300 struct net_device *dev = idev->dev;
301 BUG_TRAP(idev->addr_list==NULL);
302 BUG_TRAP(idev->mc_list==NULL);
303 #ifdef NET_REFCNT_DEBUG
304 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
305 #endif
306 dev_put(dev);
307 if (!idev->dead) {
308 printk("Freeing alive inet6 device %p\n", idev);
309 return;
310 }
311 snmp6_free_dev(idev);
312 kfree(idev);
313 }
314
315 static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
316 {
317 struct inet6_dev *ndev;
318
319 ASSERT_RTNL();
320
321 if (dev->mtu < IPV6_MIN_MTU)
322 return NULL;
323
324 ndev = kmalloc(sizeof(struct inet6_dev), GFP_KERNEL);
325
326 if (ndev) {
327 memset(ndev, 0, sizeof(struct inet6_dev));
328
329 rwlock_init(&ndev->lock);
330 ndev->dev = dev;
331 memcpy(&ndev->cnf, &ipv6_devconf_dflt, sizeof(ndev->cnf));
332 ndev->cnf.mtu6 = dev->mtu;
333 ndev->cnf.sysctl = NULL;
334 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
335 if (ndev->nd_parms == NULL) {
336 kfree(ndev);
337 return NULL;
338 }
339 /* We refer to the device */
340 dev_hold(dev);
341
342 if (snmp6_alloc_dev(ndev) < 0) {
343 ADBG((KERN_WARNING
344 "%s(): cannot allocate memory for statistics; dev=%s.\n",
345 __FUNCTION__, dev->name));
346 neigh_parms_release(&nd_tbl, ndev->nd_parms);
347 ndev->dead = 1;
348 in6_dev_finish_destroy(ndev);
349 return NULL;
350 }
351
352 if (snmp6_register_dev(ndev) < 0) {
353 ADBG((KERN_WARNING
354 "%s(): cannot create /proc/net/dev_snmp6/%s\n",
355 __FUNCTION__, dev->name));
356 neigh_parms_release(&nd_tbl, ndev->nd_parms);
357 ndev->dead = 1;
358 in6_dev_finish_destroy(ndev);
359 return NULL;
360 }
361
362 /* One reference from device. We must do this before
363 * we invoke __ipv6_regen_rndid().
364 */
365 in6_dev_hold(ndev);
366
367 #ifdef CONFIG_IPV6_PRIVACY
368 get_random_bytes(ndev->rndid, sizeof(ndev->rndid));
369 get_random_bytes(ndev->entropy, sizeof(ndev->entropy));
370 init_timer(&ndev->regen_timer);
371 ndev->regen_timer.function = ipv6_regen_rndid;
372 ndev->regen_timer.data = (unsigned long) ndev;
373 if ((dev->flags&IFF_LOOPBACK) ||
374 dev->type == ARPHRD_TUNNEL ||
375 dev->type == ARPHRD_SIT) {
376 printk(KERN_INFO
377 "Disabled Privacy Extensions on device %p(%s)\n",
378 dev, dev->name);
379 ndev->cnf.use_tempaddr = -1;
380 } else {
381 in6_dev_hold(ndev);
382 ipv6_regen_rndid((unsigned long) ndev);
383 }
384 #endif
385
386 write_lock_bh(&addrconf_lock);
387 dev->ip6_ptr = ndev;
388 write_unlock_bh(&addrconf_lock);
389
390 ipv6_mc_init_dev(ndev);
391 ndev->tstamp = jiffies;
392 #ifdef CONFIG_SYSCTL
393 neigh_sysctl_register(dev, ndev->nd_parms, NET_IPV6,
394 NET_IPV6_NEIGH, "ipv6", &ndisc_ifinfo_sysctl_change);
395 addrconf_sysctl_register(ndev, &ndev->cnf);
396 #endif
397 }
398 return ndev;
399 }
400
401 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
402 {
403 struct inet6_dev *idev;
404
405 ASSERT_RTNL();
406
407 if ((idev = __in6_dev_get(dev)) == NULL) {
408 if ((idev = ipv6_add_dev(dev)) == NULL)
409 return NULL;
410 }
411 if (dev->flags&IFF_UP)
412 ipv6_mc_up(idev);
413 return idev;
414 }
415
416 #ifdef CONFIG_SYSCTL
417 static void dev_forward_change(struct inet6_dev *idev)
418 {
419 struct net_device *dev;
420 struct inet6_ifaddr *ifa;
421 struct in6_addr addr;
422
423 if (!idev)
424 return;
425 dev = idev->dev;
426 if (dev && (dev->flags & IFF_MULTICAST)) {
427 ipv6_addr_all_routers(&addr);
428
429 if (idev->cnf.forwarding)
430 ipv6_dev_mc_inc(dev, &addr);
431 else
432 ipv6_dev_mc_dec(dev, &addr);
433 }
434 for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
435 if (idev->cnf.forwarding)
436 addrconf_join_anycast(ifa);
437 else
438 addrconf_leave_anycast(ifa);
439 }
440 }
441
442
443 static void addrconf_forward_change(void)
444 {
445 struct net_device *dev;
446 struct inet6_dev *idev;
447
448 read_lock(&dev_base_lock);
449 for (dev=dev_base; dev; dev=dev->next) {
450 read_lock(&addrconf_lock);
451 idev = __in6_dev_get(dev);
452 if (idev) {
453 int changed = (!idev->cnf.forwarding) ^ (!ipv6_devconf.forwarding);
454 idev->cnf.forwarding = ipv6_devconf.forwarding;
455 if (changed)
456 dev_forward_change(idev);
457 }
458 read_unlock(&addrconf_lock);
459 }
460 read_unlock(&dev_base_lock);
461 }
462 #endif
463
464 /* Nobody refers to this ifaddr, destroy it */
465
466 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
467 {
468 BUG_TRAP(ifp->if_next==NULL);
469 BUG_TRAP(ifp->lst_next==NULL);
470 #ifdef NET_REFCNT_DEBUG
471 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
472 #endif
473
474 in6_dev_put(ifp->idev);
475
476 if (del_timer(&ifp->timer))
477 printk("Timer is still running, when freeing ifa=%p\n", ifp);
478
479 if (!ifp->dead) {
480 printk("Freeing alive inet6 address %p\n", ifp);
481 return;
482 }
483 dst_release(&ifp->rt->u.dst);
484
485 kfree(ifp);
486 }
487
488 /* On success it returns ifp with increased reference count */
489
490 static struct inet6_ifaddr *
491 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
492 int scope, unsigned flags)
493 {
494 struct inet6_ifaddr *ifa = NULL;
495 struct rt6_info *rt;
496 int hash;
497 int err = 0;
498
499 read_lock_bh(&addrconf_lock);
500 if (idev->dead) {
501 err = -ENODEV; /*XXX*/
502 goto out2;
503 }
504
505 write_lock(&addrconf_hash_lock);
506
507 /* Ignore adding duplicate addresses on an interface */
508 if (ipv6_chk_same_addr(addr, idev->dev)) {
509 ADBG(("ipv6_add_addr: already assigned\n"));
510 err = -EEXIST;
511 goto out;
512 }
513
514 ifa = kmalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
515
516 if (ifa == NULL) {
517 ADBG(("ipv6_add_addr: malloc failed\n"));
518 err = -ENOBUFS;
519 goto out;
520 }
521
522 rt = addrconf_dst_alloc(idev, addr, 0);
523 if (IS_ERR(rt)) {
524 err = PTR_ERR(rt);
525 goto out;
526 }
527
528 memset(ifa, 0, sizeof(struct inet6_ifaddr));
529 ipv6_addr_copy(&ifa->addr, addr);
530
531 spin_lock_init(&ifa->lock);
532 init_timer(&ifa->timer);
533 ifa->timer.data = (unsigned long) ifa;
534 ifa->scope = scope;
535 ifa->prefix_len = pfxlen;
536 ifa->flags = flags | IFA_F_TENTATIVE;
537 ifa->cstamp = ifa->tstamp = jiffies;
538
539 ifa->idev = idev;
540 in6_dev_hold(idev);
541 /* For caller */
542 in6_ifa_hold(ifa);
543
544 /* Add to big hash table */
545 hash = ipv6_addr_hash(addr);
546
547 ifa->lst_next = inet6_addr_lst[hash];
548 inet6_addr_lst[hash] = ifa;
549 in6_ifa_hold(ifa);
550 write_unlock(&addrconf_hash_lock);
551
552 write_lock(&idev->lock);
553 /* Add to inet6_dev unicast addr list. */
554 ifa->if_next = idev->addr_list;
555 idev->addr_list = ifa;
556
557 #ifdef CONFIG_IPV6_PRIVACY
558 if (ifa->flags&IFA_F_TEMPORARY) {
559 ifa->tmp_next = idev->tempaddr_list;
560 idev->tempaddr_list = ifa;
561 in6_ifa_hold(ifa);
562 }
563 #endif
564
565 ifa->rt = rt;
566
567 in6_ifa_hold(ifa);
568 write_unlock(&idev->lock);
569 out2:
570 read_unlock_bh(&addrconf_lock);
571
572 if (unlikely(err == 0))
573 notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
574 else {
575 kfree(ifa);
576 ifa = ERR_PTR(err);
577 }
578
579 return ifa;
580 out:
581 write_unlock(&addrconf_hash_lock);
582 goto out2;
583 }
584
585 /* This function wants to get referenced ifp and releases it before return */
586
587 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
588 {
589 struct inet6_ifaddr *ifa, **ifap;
590 struct inet6_dev *idev = ifp->idev;
591 int hash;
592
593 hash = ipv6_addr_hash(&ifp->addr);
594
595 ifp->dead = 1;
596
597 write_lock_bh(&addrconf_hash_lock);
598 for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
599 ifap = &ifa->lst_next) {
600 if (ifa == ifp) {
601 *ifap = ifa->lst_next;
602 __in6_ifa_put(ifp);
603 ifa->lst_next = NULL;
604 break;
605 }
606 }
607 write_unlock_bh(&addrconf_hash_lock);
608
609 write_lock_bh(&idev->lock);
610 #ifdef CONFIG_IPV6_PRIVACY
611 if (ifp->flags&IFA_F_TEMPORARY) {
612 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
613 ifap = &ifa->tmp_next) {
614 if (ifa == ifp) {
615 *ifap = ifa->tmp_next;
616 if (ifp->ifpub) {
617 in6_ifa_put(ifp->ifpub);
618 ifp->ifpub = NULL;
619 }
620 __in6_ifa_put(ifp);
621 ifa->tmp_next = NULL;
622 break;
623 }
624 }
625 }
626 #endif
627
628 for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;
629 ifap = &ifa->if_next) {
630 if (ifa == ifp) {
631 *ifap = ifa->if_next;
632 __in6_ifa_put(ifp);
633 ifa->if_next = NULL;
634 break;
635 }
636 }
637 write_unlock_bh(&idev->lock);
638
639 ipv6_ifa_notify(RTM_DELADDR, ifp);
640
641 notifier_call_chain(&inet6addr_chain,NETDEV_DOWN,ifp);
642
643 addrconf_del_timer(ifp);
644
645 in6_ifa_put(ifp);
646 }
647
648 #ifdef CONFIG_IPV6_PRIVACY
649 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
650 {
651 struct inet6_dev *idev = ifp->idev;
652 struct in6_addr addr, *tmpaddr;
653 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
654 int tmp_plen;
655 int ret = 0;
656 int max_addresses;
657
658 write_lock(&idev->lock);
659 if (ift) {
660 spin_lock_bh(&ift->lock);
661 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
662 spin_unlock_bh(&ift->lock);
663 tmpaddr = &addr;
664 } else {
665 tmpaddr = NULL;
666 }
667 retry:
668 in6_dev_hold(idev);
669 if (idev->cnf.use_tempaddr <= 0) {
670 write_unlock(&idev->lock);
671 printk(KERN_INFO
672 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
673 in6_dev_put(idev);
674 ret = -1;
675 goto out;
676 }
677 spin_lock_bh(&ifp->lock);
678 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
679 idev->cnf.use_tempaddr = -1; /*XXX*/
680 spin_unlock_bh(&ifp->lock);
681 write_unlock(&idev->lock);
682 printk(KERN_WARNING
683 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
684 in6_dev_put(idev);
685 ret = -1;
686 goto out;
687 }
688 in6_ifa_hold(ifp);
689 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
690 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
691 spin_unlock_bh(&ifp->lock);
692 write_unlock(&idev->lock);
693 printk(KERN_WARNING
694 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
695 in6_ifa_put(ifp);
696 in6_dev_put(idev);
697 ret = -1;
698 goto out;
699 }
700 memcpy(&addr.s6_addr[8], idev->rndid, 8);
701 tmp_valid_lft = min_t(__u32,
702 ifp->valid_lft,
703 idev->cnf.temp_valid_lft);
704 tmp_prefered_lft = min_t(__u32,
705 ifp->prefered_lft,
706 idev->cnf.temp_prefered_lft - desync_factor / HZ);
707 tmp_plen = ifp->prefix_len;
708 max_addresses = idev->cnf.max_addresses;
709 tmp_cstamp = ifp->cstamp;
710 tmp_tstamp = ifp->tstamp;
711 spin_unlock_bh(&ifp->lock);
712
713 write_unlock(&idev->lock);
714 ift = !max_addresses ||
715 ipv6_count_addresses(idev) < max_addresses ?
716 ipv6_add_addr(idev, &addr, tmp_plen,
717 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK, IFA_F_TEMPORARY) : NULL;
718 if (!ift || IS_ERR(ift)) {
719 in6_ifa_put(ifp);
720 in6_dev_put(idev);
721 printk(KERN_INFO
722 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
723 tmpaddr = &addr;
724 write_lock(&idev->lock);
725 goto retry;
726 }
727
728 spin_lock_bh(&ift->lock);
729 ift->ifpub = ifp;
730 ift->valid_lft = tmp_valid_lft;
731 ift->prefered_lft = tmp_prefered_lft;
732 ift->cstamp = tmp_cstamp;
733 ift->tstamp = tmp_tstamp;
734 spin_unlock_bh(&ift->lock);
735
736 addrconf_dad_start(ift, 0);
737 in6_ifa_put(ift);
738 in6_dev_put(idev);
739 out:
740 return ret;
741 }
742 #endif
743
744 /*
745 * Choose an appropriate source address
746 * should do:
747 * i) get an address with an appropriate scope
748 * ii) see if there is a specific route for the destination and use
749 * an address of the attached interface
750 * iii) don't use deprecated addresses
751 */
752 static int inline ipv6_saddr_pref(const struct inet6_ifaddr *ifp, u8 invpref)
753 {
754 int pref;
755 pref = ifp->flags&IFA_F_DEPRECATED ? 0 : 2;
756 #ifdef CONFIG_IPV6_PRIVACY
757 pref |= (ifp->flags^invpref)&IFA_F_TEMPORARY ? 0 : 1;
758 #endif
759 return pref;
760 }
761
762 #ifdef CONFIG_IPV6_PRIVACY
763 #define IPV6_GET_SADDR_MAXSCORE(score) ((score) == 3)
764 #else
765 #define IPV6_GET_SADDR_MAXSCORE(score) (score)
766 #endif
767
768 int ipv6_dev_get_saddr(struct net_device *dev,
769 struct in6_addr *daddr, struct in6_addr *saddr)
770 {
771 struct inet6_ifaddr *ifp = NULL;
772 struct inet6_ifaddr *match = NULL;
773 struct inet6_dev *idev;
774 int scope;
775 int err;
776 int hiscore = -1, score;
777
778 scope = ipv6_addr_scope(daddr);
779
780 /*
781 * known dev
782 * search dev and walk through dev addresses
783 */
784
785 if (dev) {
786 if (dev->flags & IFF_LOOPBACK)
787 scope = IFA_HOST;
788
789 read_lock(&addrconf_lock);
790 idev = __in6_dev_get(dev);
791 if (idev) {
792 read_lock_bh(&idev->lock);
793 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
794 if (ifp->scope == scope) {
795 if (ifp->flags&IFA_F_TENTATIVE)
796 continue;
797 #ifdef CONFIG_IPV6_PRIVACY
798 score = ipv6_saddr_pref(ifp, idev->cnf.use_tempaddr > 1 ? IFA_F_TEMPORARY : 0);
799 #else
800 score = ipv6_saddr_pref(ifp, 0);
801 #endif
802 if (score <= hiscore)
803 continue;
804
805 if (match)
806 in6_ifa_put(match);
807 match = ifp;
808 hiscore = score;
809 in6_ifa_hold(ifp);
810
811 if (IPV6_GET_SADDR_MAXSCORE(score)) {
812 read_unlock_bh(&idev->lock);
813 read_unlock(&addrconf_lock);
814 goto out;
815 }
816 }
817 }
818 read_unlock_bh(&idev->lock);
819 }
820 read_unlock(&addrconf_lock);
821 }
822
823 if (scope == IFA_LINK)
824 goto out;
825
826 /*
827 * dev == NULL or search failed for specified dev
828 */
829
830 read_lock(&dev_base_lock);
831 read_lock(&addrconf_lock);
832 for (dev = dev_base; dev; dev=dev->next) {
833 idev = __in6_dev_get(dev);
834 if (idev) {
835 read_lock_bh(&idev->lock);
836 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
837 if (ifp->scope == scope) {
838 if (ifp->flags&IFA_F_TENTATIVE)
839 continue;
840 #ifdef CONFIG_IPV6_PRIVACY
841 score = ipv6_saddr_pref(ifp, idev->cnf.use_tempaddr > 1 ? IFA_F_TEMPORARY : 0);
842 #else
843 score = ipv6_saddr_pref(ifp, 0);
844 #endif
845 if (score <= hiscore)
846 continue;
847
848 if (match)
849 in6_ifa_put(match);
850 match = ifp;
851 hiscore = score;
852 in6_ifa_hold(ifp);
853
854 if (IPV6_GET_SADDR_MAXSCORE(score)) {
855 read_unlock_bh(&idev->lock);
856 goto out_unlock_base;
857 }
858 }
859 }
860 read_unlock_bh(&idev->lock);
861 }
862 }
863
864 out_unlock_base:
865 read_unlock(&addrconf_lock);
866 read_unlock(&dev_base_lock);
867
868 out:
869 err = -EADDRNOTAVAIL;
870 if (match) {
871 ipv6_addr_copy(saddr, &match->addr);
872 err = 0;
873 in6_ifa_put(match);
874 }
875
876 return err;
877 }
878
879
880 int ipv6_get_saddr(struct dst_entry *dst,
881 struct in6_addr *daddr, struct in6_addr *saddr)
882 {
883 return ipv6_dev_get_saddr(dst ? dst->dev : NULL, daddr, saddr);
884 }
885
886
887 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr)
888 {
889 struct inet6_dev *idev;
890 int err = -EADDRNOTAVAIL;
891
892 read_lock(&addrconf_lock);
893 if ((idev = __in6_dev_get(dev)) != NULL) {
894 struct inet6_ifaddr *ifp;
895
896 read_lock_bh(&idev->lock);
897 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
898 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
899 ipv6_addr_copy(addr, &ifp->addr);
900 err = 0;
901 break;
902 }
903 }
904 read_unlock_bh(&idev->lock);
905 }
906 read_unlock(&addrconf_lock);
907 return err;
908 }
909
910 static int ipv6_count_addresses(struct inet6_dev *idev)
911 {
912 int cnt = 0;
913 struct inet6_ifaddr *ifp;
914
915 read_lock_bh(&idev->lock);
916 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
917 cnt++;
918 read_unlock_bh(&idev->lock);
919 return cnt;
920 }
921
922 int ipv6_chk_addr(struct in6_addr *addr, struct net_device *dev, int strict)
923 {
924 struct inet6_ifaddr * ifp;
925 u8 hash = ipv6_addr_hash(addr);
926
927 read_lock_bh(&addrconf_hash_lock);
928 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
929 if (ipv6_addr_equal(&ifp->addr, addr) &&
930 !(ifp->flags&IFA_F_TENTATIVE)) {
931 if (dev == NULL || ifp->idev->dev == dev ||
932 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
933 break;
934 }
935 }
936 read_unlock_bh(&addrconf_hash_lock);
937 return ifp != NULL;
938 }
939
940 static
941 int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev)
942 {
943 struct inet6_ifaddr * ifp;
944 u8 hash = ipv6_addr_hash(addr);
945
946 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
947 if (ipv6_addr_equal(&ifp->addr, addr)) {
948 if (dev == NULL || ifp->idev->dev == dev)
949 break;
950 }
951 }
952 return ifp != NULL;
953 }
954
955 struct inet6_ifaddr * ipv6_get_ifaddr(struct in6_addr *addr, struct net_device *dev, int strict)
956 {
957 struct inet6_ifaddr * ifp;
958 u8 hash = ipv6_addr_hash(addr);
959
960 read_lock_bh(&addrconf_hash_lock);
961 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
962 if (ipv6_addr_equal(&ifp->addr, addr)) {
963 if (dev == NULL || ifp->idev->dev == dev ||
964 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
965 in6_ifa_hold(ifp);
966 break;
967 }
968 }
969 }
970 read_unlock_bh(&addrconf_hash_lock);
971
972 return ifp;
973 }
974
975 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
976 {
977 const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
978 const struct in6_addr *sk2_rcv_saddr6 = tcp_v6_rcv_saddr(sk2);
979 u32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
980 u32 sk2_rcv_saddr = tcp_v4_rcv_saddr(sk2);
981 int sk_ipv6only = ipv6_only_sock(sk);
982 int sk2_ipv6only = tcp_v6_ipv6only(sk2);
983 int addr_type = ipv6_addr_type(sk_rcv_saddr6);
984 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
985
986 if (!sk2_rcv_saddr && !sk_ipv6only)
987 return 1;
988
989 if (addr_type2 == IPV6_ADDR_ANY &&
990 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
991 return 1;
992
993 if (addr_type == IPV6_ADDR_ANY &&
994 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
995 return 1;
996
997 if (sk2_rcv_saddr6 &&
998 ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
999 return 1;
1000
1001 if (addr_type == IPV6_ADDR_MAPPED &&
1002 !sk2_ipv6only &&
1003 (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1004 return 1;
1005
1006 return 0;
1007 }
1008
1009 /* Gets referenced address, destroys ifaddr */
1010
1011 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1012 {
1013 if (net_ratelimit())
1014 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1015 if (ifp->flags&IFA_F_PERMANENT) {
1016 spin_lock_bh(&ifp->lock);
1017 addrconf_del_timer(ifp);
1018 ifp->flags |= IFA_F_TENTATIVE;
1019 spin_unlock_bh(&ifp->lock);
1020 in6_ifa_put(ifp);
1021 #ifdef CONFIG_IPV6_PRIVACY
1022 } else if (ifp->flags&IFA_F_TEMPORARY) {
1023 struct inet6_ifaddr *ifpub;
1024 spin_lock_bh(&ifp->lock);
1025 ifpub = ifp->ifpub;
1026 if (ifpub) {
1027 in6_ifa_hold(ifpub);
1028 spin_unlock_bh(&ifp->lock);
1029 ipv6_create_tempaddr(ifpub, ifp);
1030 in6_ifa_put(ifpub);
1031 } else {
1032 spin_unlock_bh(&ifp->lock);
1033 }
1034 ipv6_del_addr(ifp);
1035 #endif
1036 } else
1037 ipv6_del_addr(ifp);
1038 }
1039
1040
1041 /* Join to solicited addr multicast group. */
1042
1043 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1044 {
1045 struct in6_addr maddr;
1046
1047 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1048 return;
1049
1050 addrconf_addr_solict_mult(addr, &maddr);
1051 ipv6_dev_mc_inc(dev, &maddr);
1052 }
1053
1054 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1055 {
1056 struct in6_addr maddr;
1057
1058 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1059 return;
1060
1061 addrconf_addr_solict_mult(addr, &maddr);
1062 __ipv6_dev_mc_dec(idev, &maddr);
1063 }
1064
1065 void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1066 {
1067 struct in6_addr addr;
1068 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1069 if (ipv6_addr_any(&addr))
1070 return;
1071 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1072 }
1073
1074 void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1075 {
1076 struct in6_addr addr;
1077 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1078 if (ipv6_addr_any(&addr))
1079 return;
1080 __ipv6_dev_ac_dec(ifp->idev, &addr);
1081 }
1082
1083 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1084 {
1085 switch (dev->type) {
1086 case ARPHRD_ETHER:
1087 case ARPHRD_FDDI:
1088 case ARPHRD_IEEE802_TR:
1089 if (dev->addr_len != ETH_ALEN)
1090 return -1;
1091 memcpy(eui, dev->dev_addr, 3);
1092 memcpy(eui + 5, dev->dev_addr + 3, 3);
1093
1094 /*
1095 * The zSeries OSA network cards can be shared among various
1096 * OS instances, but the OSA cards have only one MAC address.
1097 * This leads to duplicate address conflicts in conjunction
1098 * with IPv6 if more than one instance uses the same card.
1099 *
1100 * The driver for these cards can deliver a unique 16-bit
1101 * identifier for each instance sharing the same card. It is
1102 * placed instead of 0xFFFE in the interface identifier. The
1103 * "u" bit of the interface identifier is not inverted in this
1104 * case. Hence the resulting interface identifier has local
1105 * scope according to RFC2373.
1106 */
1107 if (dev->dev_id) {
1108 eui[3] = (dev->dev_id >> 8) & 0xFF;
1109 eui[4] = dev->dev_id & 0xFF;
1110 } else {
1111 eui[3] = 0xFF;
1112 eui[4] = 0xFE;
1113 eui[0] ^= 2;
1114 }
1115 return 0;
1116 case ARPHRD_ARCNET:
1117 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1118 if (dev->addr_len != ARCNET_ALEN)
1119 return -1;
1120 memset(eui, 0, 7);
1121 eui[7] = *(u8*)dev->dev_addr;
1122 return 0;
1123 case ARPHRD_INFINIBAND:
1124 if (dev->addr_len != INFINIBAND_ALEN)
1125 return -1;
1126 memcpy(eui, dev->dev_addr + 12, 8);
1127 eui[0] |= 2;
1128 return 0;
1129 }
1130 return -1;
1131 }
1132
1133 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1134 {
1135 int err = -1;
1136 struct inet6_ifaddr *ifp;
1137
1138 read_lock_bh(&idev->lock);
1139 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1140 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1141 memcpy(eui, ifp->addr.s6_addr+8, 8);
1142 err = 0;
1143 break;
1144 }
1145 }
1146 read_unlock_bh(&idev->lock);
1147 return err;
1148 }
1149
1150 #ifdef CONFIG_IPV6_PRIVACY
1151 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1152 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1153 {
1154 struct net_device *dev;
1155 struct scatterlist sg[2];
1156
1157 sg[0].page = virt_to_page(idev->entropy);
1158 sg[0].offset = offset_in_page(idev->entropy);
1159 sg[0].length = 8;
1160 sg[1].page = virt_to_page(idev->work_eui64);
1161 sg[1].offset = offset_in_page(idev->work_eui64);
1162 sg[1].length = 8;
1163
1164 dev = idev->dev;
1165
1166 if (ipv6_generate_eui64(idev->work_eui64, dev)) {
1167 printk(KERN_INFO
1168 "__ipv6_regen_rndid(idev=%p): cannot get EUI64 identifier; use random bytes.\n",
1169 idev);
1170 get_random_bytes(idev->work_eui64, sizeof(idev->work_eui64));
1171 }
1172 regen:
1173 spin_lock(&md5_tfm_lock);
1174 if (unlikely(md5_tfm == NULL)) {
1175 spin_unlock(&md5_tfm_lock);
1176 return -1;
1177 }
1178 crypto_digest_init(md5_tfm);
1179 crypto_digest_update(md5_tfm, sg, 2);
1180 crypto_digest_final(md5_tfm, idev->work_digest);
1181 spin_unlock(&md5_tfm_lock);
1182
1183 memcpy(idev->rndid, &idev->work_digest[0], 8);
1184 idev->rndid[0] &= ~0x02;
1185 memcpy(idev->entropy, &idev->work_digest[8], 8);
1186
1187 /*
1188 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1189 * check if generated address is not inappropriate
1190 *
1191 * - Reserved subnet anycast (RFC 2526)
1192 * 11111101 11....11 1xxxxxxx
1193 * - ISATAP (draft-ietf-ngtrans-isatap-13.txt) 5.1
1194 * 00-00-5E-FE-xx-xx-xx-xx
1195 * - value 0
1196 * - XXX: already assigned to an address on the device
1197 */
1198 if (idev->rndid[0] == 0xfd &&
1199 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1200 (idev->rndid[7]&0x80))
1201 goto regen;
1202 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1203 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1204 goto regen;
1205 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1206 goto regen;
1207 }
1208
1209 return 0;
1210 }
1211
1212 static void ipv6_regen_rndid(unsigned long data)
1213 {
1214 struct inet6_dev *idev = (struct inet6_dev *) data;
1215 unsigned long expires;
1216
1217 read_lock_bh(&addrconf_lock);
1218 write_lock_bh(&idev->lock);
1219
1220 if (idev->dead)
1221 goto out;
1222
1223 if (__ipv6_regen_rndid(idev) < 0)
1224 goto out;
1225
1226 expires = jiffies +
1227 idev->cnf.temp_prefered_lft * HZ -
1228 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1229 if (time_before(expires, jiffies)) {
1230 printk(KERN_WARNING
1231 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1232 idev->dev->name);
1233 goto out;
1234 }
1235
1236 if (!mod_timer(&idev->regen_timer, expires))
1237 in6_dev_hold(idev);
1238
1239 out:
1240 write_unlock_bh(&idev->lock);
1241 read_unlock_bh(&addrconf_lock);
1242 in6_dev_put(idev);
1243 }
1244
1245 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1246 int ret = 0;
1247
1248 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1249 ret = __ipv6_regen_rndid(idev);
1250 return ret;
1251 }
1252 #endif
1253
1254 /*
1255 * Add prefix route.
1256 */
1257
1258 static void
1259 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1260 unsigned long expires, unsigned flags)
1261 {
1262 struct in6_rtmsg rtmsg;
1263
1264 memset(&rtmsg, 0, sizeof(rtmsg));
1265 ipv6_addr_copy(&rtmsg.rtmsg_dst, pfx);
1266 rtmsg.rtmsg_dst_len = plen;
1267 rtmsg.rtmsg_metric = IP6_RT_PRIO_ADDRCONF;
1268 rtmsg.rtmsg_ifindex = dev->ifindex;
1269 rtmsg.rtmsg_info = expires;
1270 rtmsg.rtmsg_flags = RTF_UP|flags;
1271 rtmsg.rtmsg_type = RTMSG_NEWROUTE;
1272
1273 /* Prevent useless cloning on PtP SIT.
1274 This thing is done here expecting that the whole
1275 class of non-broadcast devices need not cloning.
1276 */
1277 if (dev->type == ARPHRD_SIT && (dev->flags&IFF_POINTOPOINT))
1278 rtmsg.rtmsg_flags |= RTF_NONEXTHOP;
1279
1280 ip6_route_add(&rtmsg, NULL, NULL);
1281 }
1282
1283 /* Create "default" multicast route to the interface */
1284
1285 static void addrconf_add_mroute(struct net_device *dev)
1286 {
1287 struct in6_rtmsg rtmsg;
1288
1289 memset(&rtmsg, 0, sizeof(rtmsg));
1290 ipv6_addr_set(&rtmsg.rtmsg_dst,
1291 htonl(0xFF000000), 0, 0, 0);
1292 rtmsg.rtmsg_dst_len = 8;
1293 rtmsg.rtmsg_metric = IP6_RT_PRIO_ADDRCONF;
1294 rtmsg.rtmsg_ifindex = dev->ifindex;
1295 rtmsg.rtmsg_flags = RTF_UP;
1296 rtmsg.rtmsg_type = RTMSG_NEWROUTE;
1297 ip6_route_add(&rtmsg, NULL, NULL);
1298 }
1299
1300 static void sit_route_add(struct net_device *dev)
1301 {
1302 struct in6_rtmsg rtmsg;
1303
1304 memset(&rtmsg, 0, sizeof(rtmsg));
1305
1306 rtmsg.rtmsg_type = RTMSG_NEWROUTE;
1307 rtmsg.rtmsg_metric = IP6_RT_PRIO_ADDRCONF;
1308
1309 /* prefix length - 96 bits "::d.d.d.d" */
1310 rtmsg.rtmsg_dst_len = 96;
1311 rtmsg.rtmsg_flags = RTF_UP|RTF_NONEXTHOP;
1312 rtmsg.rtmsg_ifindex = dev->ifindex;
1313
1314 ip6_route_add(&rtmsg, NULL, NULL);
1315 }
1316
1317 static void addrconf_add_lroute(struct net_device *dev)
1318 {
1319 struct in6_addr addr;
1320
1321 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1322 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1323 }
1324
1325 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1326 {
1327 struct inet6_dev *idev;
1328
1329 ASSERT_RTNL();
1330
1331 if ((idev = ipv6_find_idev(dev)) == NULL)
1332 return NULL;
1333
1334 /* Add default multicast route */
1335 addrconf_add_mroute(dev);
1336
1337 /* Add link local route */
1338 addrconf_add_lroute(dev);
1339 return idev;
1340 }
1341
1342 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1343 {
1344 struct prefix_info *pinfo;
1345 __u32 valid_lft;
1346 __u32 prefered_lft;
1347 int addr_type;
1348 unsigned long rt_expires;
1349 struct inet6_dev *in6_dev;
1350
1351 pinfo = (struct prefix_info *) opt;
1352
1353 if (len < sizeof(struct prefix_info)) {
1354 ADBG(("addrconf: prefix option too short\n"));
1355 return;
1356 }
1357
1358 /*
1359 * Validation checks ([ADDRCONF], page 19)
1360 */
1361
1362 addr_type = ipv6_addr_type(&pinfo->prefix);
1363
1364 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1365 return;
1366
1367 valid_lft = ntohl(pinfo->valid);
1368 prefered_lft = ntohl(pinfo->prefered);
1369
1370 if (prefered_lft > valid_lft) {
1371 if (net_ratelimit())
1372 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1373 return;
1374 }
1375
1376 in6_dev = in6_dev_get(dev);
1377
1378 if (in6_dev == NULL) {
1379 if (net_ratelimit())
1380 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1381 return;
1382 }
1383
1384 /*
1385 * Two things going on here:
1386 * 1) Add routes for on-link prefixes
1387 * 2) Configure prefixes with the auto flag set
1388 */
1389
1390 /* Avoid arithmetic overflow. Really, we could
1391 save rt_expires in seconds, likely valid_lft,
1392 but it would require division in fib gc, that it
1393 not good.
1394 */
1395 if (valid_lft >= 0x7FFFFFFF/HZ)
1396 rt_expires = 0;
1397 else
1398 rt_expires = jiffies + valid_lft * HZ;
1399
1400 if (pinfo->onlink) {
1401 struct rt6_info *rt;
1402 rt = rt6_lookup(&pinfo->prefix, NULL, dev->ifindex, 1);
1403
1404 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
1405 if (rt->rt6i_flags&RTF_EXPIRES) {
1406 if (valid_lft == 0) {
1407 ip6_del_rt(rt, NULL, NULL);
1408 rt = NULL;
1409 } else {
1410 rt->rt6i_expires = rt_expires;
1411 }
1412 }
1413 } else if (valid_lft) {
1414 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1415 dev, rt_expires, RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT);
1416 }
1417 if (rt)
1418 dst_release(&rt->u.dst);
1419 }
1420
1421 /* Try to figure out our local address for this prefix */
1422
1423 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1424 struct inet6_ifaddr * ifp;
1425 struct in6_addr addr;
1426 int create = 0, update_lft = 0;
1427
1428 if (pinfo->prefix_len == 64) {
1429 memcpy(&addr, &pinfo->prefix, 8);
1430 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1431 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1432 in6_dev_put(in6_dev);
1433 return;
1434 }
1435 goto ok;
1436 }
1437 if (net_ratelimit())
1438 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1439 pinfo->prefix_len);
1440 in6_dev_put(in6_dev);
1441 return;
1442
1443 ok:
1444
1445 ifp = ipv6_get_ifaddr(&addr, dev, 1);
1446
1447 if (ifp == NULL && valid_lft) {
1448 int max_addresses = in6_dev->cnf.max_addresses;
1449
1450 /* Do not allow to create too much of autoconfigured
1451 * addresses; this would be too easy way to crash kernel.
1452 */
1453 if (!max_addresses ||
1454 ipv6_count_addresses(in6_dev) < max_addresses)
1455 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1456 addr_type&IPV6_ADDR_SCOPE_MASK, 0);
1457
1458 if (!ifp || IS_ERR(ifp)) {
1459 in6_dev_put(in6_dev);
1460 return;
1461 }
1462
1463 update_lft = create = 1;
1464 ifp->cstamp = jiffies;
1465 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1466 }
1467
1468 if (ifp) {
1469 int flags;
1470 unsigned long now;
1471 #ifdef CONFIG_IPV6_PRIVACY
1472 struct inet6_ifaddr *ift;
1473 #endif
1474 u32 stored_lft;
1475
1476 /* update lifetime (RFC2462 5.5.3 e) */
1477 spin_lock(&ifp->lock);
1478 now = jiffies;
1479 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1480 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1481 else
1482 stored_lft = 0;
1483 if (!update_lft && stored_lft) {
1484 if (valid_lft > MIN_VALID_LIFETIME ||
1485 valid_lft > stored_lft)
1486 update_lft = 1;
1487 else if (stored_lft <= MIN_VALID_LIFETIME) {
1488 /* valid_lft <= stored_lft is always true */
1489 /* XXX: IPsec */
1490 update_lft = 0;
1491 } else {
1492 valid_lft = MIN_VALID_LIFETIME;
1493 if (valid_lft < prefered_lft)
1494 prefered_lft = valid_lft;
1495 update_lft = 1;
1496 }
1497 }
1498
1499 if (update_lft) {
1500 ifp->valid_lft = valid_lft;
1501 ifp->prefered_lft = prefered_lft;
1502 ifp->tstamp = now;
1503 flags = ifp->flags;
1504 ifp->flags &= ~IFA_F_DEPRECATED;
1505 spin_unlock(&ifp->lock);
1506
1507 if (!(flags&IFA_F_TENTATIVE))
1508 ipv6_ifa_notify(0, ifp);
1509 } else
1510 spin_unlock(&ifp->lock);
1511
1512 #ifdef CONFIG_IPV6_PRIVACY
1513 read_lock_bh(&in6_dev->lock);
1514 /* update all temporary addresses in the list */
1515 for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1516 /*
1517 * When adjusting the lifetimes of an existing
1518 * temporary address, only lower the lifetimes.
1519 * Implementations must not increase the
1520 * lifetimes of an existing temporary address
1521 * when processing a Prefix Information Option.
1522 */
1523 spin_lock(&ift->lock);
1524 flags = ift->flags;
1525 if (ift->valid_lft > valid_lft &&
1526 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1527 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1528 if (ift->prefered_lft > prefered_lft &&
1529 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1530 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1531 spin_unlock(&ift->lock);
1532 if (!(flags&IFA_F_TENTATIVE))
1533 ipv6_ifa_notify(0, ift);
1534 }
1535
1536 if (create && in6_dev->cnf.use_tempaddr > 0) {
1537 /*
1538 * When a new public address is created as described in [ADDRCONF],
1539 * also create a new temporary address.
1540 */
1541 read_unlock_bh(&in6_dev->lock);
1542 ipv6_create_tempaddr(ifp, NULL);
1543 } else {
1544 read_unlock_bh(&in6_dev->lock);
1545 }
1546 #endif
1547 in6_ifa_put(ifp);
1548 addrconf_verify(0);
1549 }
1550 }
1551 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
1552 in6_dev_put(in6_dev);
1553 }
1554
1555 /*
1556 * Set destination address.
1557 * Special case for SIT interfaces where we create a new "virtual"
1558 * device.
1559 */
1560 int addrconf_set_dstaddr(void __user *arg)
1561 {
1562 struct in6_ifreq ireq;
1563 struct net_device *dev;
1564 int err = -EINVAL;
1565
1566 rtnl_lock();
1567
1568 err = -EFAULT;
1569 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1570 goto err_exit;
1571
1572 dev = __dev_get_by_index(ireq.ifr6_ifindex);
1573
1574 err = -ENODEV;
1575 if (dev == NULL)
1576 goto err_exit;
1577
1578 if (dev->type == ARPHRD_SIT) {
1579 struct ifreq ifr;
1580 mm_segment_t oldfs;
1581 struct ip_tunnel_parm p;
1582
1583 err = -EADDRNOTAVAIL;
1584 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
1585 goto err_exit;
1586
1587 memset(&p, 0, sizeof(p));
1588 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
1589 p.iph.saddr = 0;
1590 p.iph.version = 4;
1591 p.iph.ihl = 5;
1592 p.iph.protocol = IPPROTO_IPV6;
1593 p.iph.ttl = 64;
1594 ifr.ifr_ifru.ifru_data = (void __user *)&p;
1595
1596 oldfs = get_fs(); set_fs(KERNEL_DS);
1597 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
1598 set_fs(oldfs);
1599
1600 if (err == 0) {
1601 err = -ENOBUFS;
1602 if ((dev = __dev_get_by_name(p.name)) == NULL)
1603 goto err_exit;
1604 err = dev_open(dev);
1605 }
1606 }
1607
1608 err_exit:
1609 rtnl_unlock();
1610 return err;
1611 }
1612
1613 /*
1614 * Manual configuration of address on an interface
1615 */
1616 static int inet6_addr_add(int ifindex, struct in6_addr *pfx, int plen)
1617 {
1618 struct inet6_ifaddr *ifp;
1619 struct inet6_dev *idev;
1620 struct net_device *dev;
1621 int scope;
1622
1623 ASSERT_RTNL();
1624
1625 if ((dev = __dev_get_by_index(ifindex)) == NULL)
1626 return -ENODEV;
1627
1628 if (!(dev->flags&IFF_UP))
1629 return -ENETDOWN;
1630
1631 if ((idev = addrconf_add_dev(dev)) == NULL)
1632 return -ENOBUFS;
1633
1634 scope = ipv6_addr_scope(pfx);
1635
1636 ifp = ipv6_add_addr(idev, pfx, plen, scope, IFA_F_PERMANENT);
1637 if (!IS_ERR(ifp)) {
1638 addrconf_dad_start(ifp, 0);
1639 in6_ifa_put(ifp);
1640 return 0;
1641 }
1642
1643 return PTR_ERR(ifp);
1644 }
1645
1646 static int inet6_addr_del(int ifindex, struct in6_addr *pfx, int plen)
1647 {
1648 struct inet6_ifaddr *ifp;
1649 struct inet6_dev *idev;
1650 struct net_device *dev;
1651
1652 if ((dev = __dev_get_by_index(ifindex)) == NULL)
1653 return -ENODEV;
1654
1655 if ((idev = __in6_dev_get(dev)) == NULL)
1656 return -ENXIO;
1657
1658 read_lock_bh(&idev->lock);
1659 for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
1660 if (ifp->prefix_len == plen &&
1661 ipv6_addr_equal(pfx, &ifp->addr)) {
1662 in6_ifa_hold(ifp);
1663 read_unlock_bh(&idev->lock);
1664
1665 ipv6_del_addr(ifp);
1666
1667 /* If the last address is deleted administratively,
1668 disable IPv6 on this interface.
1669 */
1670 if (idev->addr_list == NULL)
1671 addrconf_ifdown(idev->dev, 1);
1672 return 0;
1673 }
1674 }
1675 read_unlock_bh(&idev->lock);
1676 return -EADDRNOTAVAIL;
1677 }
1678
1679
1680 int addrconf_add_ifaddr(void __user *arg)
1681 {
1682 struct in6_ifreq ireq;
1683 int err;
1684
1685 if (!capable(CAP_NET_ADMIN))
1686 return -EPERM;
1687
1688 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1689 return -EFAULT;
1690
1691 rtnl_lock();
1692 err = inet6_addr_add(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
1693 rtnl_unlock();
1694 return err;
1695 }
1696
1697 int addrconf_del_ifaddr(void __user *arg)
1698 {
1699 struct in6_ifreq ireq;
1700 int err;
1701
1702 if (!capable(CAP_NET_ADMIN))
1703 return -EPERM;
1704
1705 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1706 return -EFAULT;
1707
1708 rtnl_lock();
1709 err = inet6_addr_del(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
1710 rtnl_unlock();
1711 return err;
1712 }
1713
1714 static void sit_add_v4_addrs(struct inet6_dev *idev)
1715 {
1716 struct inet6_ifaddr * ifp;
1717 struct in6_addr addr;
1718 struct net_device *dev;
1719 int scope;
1720
1721 ASSERT_RTNL();
1722
1723 memset(&addr, 0, sizeof(struct in6_addr));
1724 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
1725
1726 if (idev->dev->flags&IFF_POINTOPOINT) {
1727 addr.s6_addr32[0] = htonl(0xfe800000);
1728 scope = IFA_LINK;
1729 } else {
1730 scope = IPV6_ADDR_COMPATv4;
1731 }
1732
1733 if (addr.s6_addr32[3]) {
1734 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
1735 if (!IS_ERR(ifp)) {
1736 spin_lock_bh(&ifp->lock);
1737 ifp->flags &= ~IFA_F_TENTATIVE;
1738 spin_unlock_bh(&ifp->lock);
1739 ipv6_ifa_notify(RTM_NEWADDR, ifp);
1740 in6_ifa_put(ifp);
1741 }
1742 return;
1743 }
1744
1745 for (dev = dev_base; dev != NULL; dev = dev->next) {
1746 struct in_device * in_dev = __in_dev_get(dev);
1747 if (in_dev && (dev->flags & IFF_UP)) {
1748 struct in_ifaddr * ifa;
1749
1750 int flag = scope;
1751
1752 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1753 int plen;
1754
1755 addr.s6_addr32[3] = ifa->ifa_local;
1756
1757 if (ifa->ifa_scope == RT_SCOPE_LINK)
1758 continue;
1759 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
1760 if (idev->dev->flags&IFF_POINTOPOINT)
1761 continue;
1762 flag |= IFA_HOST;
1763 }
1764 if (idev->dev->flags&IFF_POINTOPOINT)
1765 plen = 64;
1766 else
1767 plen = 96;
1768
1769 ifp = ipv6_add_addr(idev, &addr, plen, flag,
1770 IFA_F_PERMANENT);
1771 if (!IS_ERR(ifp)) {
1772 spin_lock_bh(&ifp->lock);
1773 ifp->flags &= ~IFA_F_TENTATIVE;
1774 spin_unlock_bh(&ifp->lock);
1775 ipv6_ifa_notify(RTM_NEWADDR, ifp);
1776 in6_ifa_put(ifp);
1777 }
1778 }
1779 }
1780 }
1781 }
1782
1783 static void init_loopback(struct net_device *dev)
1784 {
1785 struct inet6_dev *idev;
1786 struct inet6_ifaddr * ifp;
1787
1788 /* ::1 */
1789
1790 ASSERT_RTNL();
1791
1792 if ((idev = ipv6_find_idev(dev)) == NULL) {
1793 printk(KERN_DEBUG "init loopback: add_dev failed\n");
1794 return;
1795 }
1796
1797 ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
1798 if (!IS_ERR(ifp)) {
1799 spin_lock_bh(&ifp->lock);
1800 ifp->flags &= ~IFA_F_TENTATIVE;
1801 spin_unlock_bh(&ifp->lock);
1802 ipv6_ifa_notify(RTM_NEWADDR, ifp);
1803 in6_ifa_put(ifp);
1804 }
1805 }
1806
1807 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
1808 {
1809 struct inet6_ifaddr * ifp;
1810
1811 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, IFA_F_PERMANENT);
1812 if (!IS_ERR(ifp)) {
1813 addrconf_dad_start(ifp, 0);
1814 in6_ifa_put(ifp);
1815 }
1816 }
1817
1818 static void addrconf_dev_config(struct net_device *dev)
1819 {
1820 struct in6_addr addr;
1821 struct inet6_dev * idev;
1822
1823 ASSERT_RTNL();
1824
1825 if ((dev->type != ARPHRD_ETHER) &&
1826 (dev->type != ARPHRD_FDDI) &&
1827 (dev->type != ARPHRD_IEEE802_TR) &&
1828 (dev->type != ARPHRD_ARCNET) &&
1829 (dev->type != ARPHRD_INFINIBAND)) {
1830 /* Alas, we support only Ethernet autoconfiguration. */
1831 return;
1832 }
1833
1834 idev = addrconf_add_dev(dev);
1835 if (idev == NULL)
1836 return;
1837
1838 memset(&addr, 0, sizeof(struct in6_addr));
1839 addr.s6_addr32[0] = htonl(0xFE800000);
1840
1841 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
1842 addrconf_add_linklocal(idev, &addr);
1843 }
1844
1845 static void addrconf_sit_config(struct net_device *dev)
1846 {
1847 struct inet6_dev *idev;
1848
1849 ASSERT_RTNL();
1850
1851 /*
1852 * Configure the tunnel with one of our IPv4
1853 * addresses... we should configure all of
1854 * our v4 addrs in the tunnel
1855 */
1856
1857 if ((idev = ipv6_find_idev(dev)) == NULL) {
1858 printk(KERN_DEBUG "init sit: add_dev failed\n");
1859 return;
1860 }
1861
1862 sit_add_v4_addrs(idev);
1863
1864 if (dev->flags&IFF_POINTOPOINT) {
1865 addrconf_add_mroute(dev);
1866 addrconf_add_lroute(dev);
1867 } else
1868 sit_route_add(dev);
1869 }
1870
1871 static inline int
1872 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
1873 {
1874 struct in6_addr lladdr;
1875
1876 if (!ipv6_get_lladdr(link_dev, &lladdr)) {
1877 addrconf_add_linklocal(idev, &lladdr);
1878 return 0;
1879 }
1880 return -1;
1881 }
1882
1883 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
1884 {
1885 struct net_device *link_dev;
1886
1887 /* first try to inherit the link-local address from the link device */
1888 if (idev->dev->iflink &&
1889 (link_dev = __dev_get_by_index(idev->dev->iflink))) {
1890 if (!ipv6_inherit_linklocal(idev, link_dev))
1891 return;
1892 }
1893 /* then try to inherit it from any device */
1894 for (link_dev = dev_base; link_dev; link_dev = link_dev->next) {
1895 if (!ipv6_inherit_linklocal(idev, link_dev))
1896 return;
1897 }
1898 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
1899 }
1900
1901 /*
1902 * Autoconfigure tunnel with a link-local address so routing protocols,
1903 * DHCPv6, MLD etc. can be run over the virtual link
1904 */
1905
1906 static void addrconf_ip6_tnl_config(struct net_device *dev)
1907 {
1908 struct inet6_dev *idev;
1909
1910 ASSERT_RTNL();
1911
1912 if ((idev = addrconf_add_dev(dev)) == NULL) {
1913 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
1914 return;
1915 }
1916 ip6_tnl_add_linklocal(idev);
1917 addrconf_add_mroute(dev);
1918 }
1919
1920 static int addrconf_notify(struct notifier_block *this, unsigned long event,
1921 void * data)
1922 {
1923 struct net_device *dev = (struct net_device *) data;
1924 struct inet6_dev *idev = __in6_dev_get(dev);
1925
1926 switch(event) {
1927 case NETDEV_UP:
1928 switch(dev->type) {
1929 case ARPHRD_SIT:
1930 addrconf_sit_config(dev);
1931 break;
1932 case ARPHRD_TUNNEL6:
1933 addrconf_ip6_tnl_config(dev);
1934 break;
1935 case ARPHRD_LOOPBACK:
1936 init_loopback(dev);
1937 break;
1938
1939 default:
1940 addrconf_dev_config(dev);
1941 break;
1942 };
1943 if (idev) {
1944 /* If the MTU changed during the interface down, when the
1945 interface up, the changed MTU must be reflected in the
1946 idev as well as routers.
1947 */
1948 if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
1949 rt6_mtu_change(dev, dev->mtu);
1950 idev->cnf.mtu6 = dev->mtu;
1951 }
1952 idev->tstamp = jiffies;
1953 inet6_ifinfo_notify(RTM_NEWLINK, idev);
1954 /* If the changed mtu during down is lower than IPV6_MIN_MTU
1955 stop IPv6 on this interface.
1956 */
1957 if (dev->mtu < IPV6_MIN_MTU)
1958 addrconf_ifdown(dev, event != NETDEV_DOWN);
1959 }
1960 break;
1961
1962 case NETDEV_CHANGEMTU:
1963 if ( idev && dev->mtu >= IPV6_MIN_MTU) {
1964 rt6_mtu_change(dev, dev->mtu);
1965 idev->cnf.mtu6 = dev->mtu;
1966 break;
1967 }
1968
1969 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
1970
1971 case NETDEV_DOWN:
1972 case NETDEV_UNREGISTER:
1973 /*
1974 * Remove all addresses from this interface.
1975 */
1976 addrconf_ifdown(dev, event != NETDEV_DOWN);
1977 break;
1978 case NETDEV_CHANGE:
1979 break;
1980 case NETDEV_CHANGENAME:
1981 #ifdef CONFIG_SYSCTL
1982 if (idev) {
1983 addrconf_sysctl_unregister(&idev->cnf);
1984 neigh_sysctl_unregister(idev->nd_parms);
1985 neigh_sysctl_register(dev, idev->nd_parms, NET_IPV6, NET_IPV6_NEIGH, "ipv6", &ndisc_ifinfo_sysctl_change);
1986 addrconf_sysctl_register(idev, &idev->cnf);
1987 }
1988 #endif
1989 break;
1990 };
1991
1992 return NOTIFY_OK;
1993 }
1994
1995 /*
1996 * addrconf module should be notified of a device going up
1997 */
1998 static struct notifier_block ipv6_dev_notf = {
1999 .notifier_call = addrconf_notify,
2000 .priority = 0
2001 };
2002
2003 static int addrconf_ifdown(struct net_device *dev, int how)
2004 {
2005 struct inet6_dev *idev;
2006 struct inet6_ifaddr *ifa, **bifa;
2007 int i;
2008
2009 ASSERT_RTNL();
2010
2011 rt6_ifdown(dev);
2012 neigh_ifdown(&nd_tbl, dev);
2013
2014 idev = __in6_dev_get(dev);
2015 if (idev == NULL)
2016 return -ENODEV;
2017
2018 /* Step 1: remove reference to ipv6 device from parent device.
2019 Do not dev_put!
2020 */
2021 if (how == 1) {
2022 write_lock_bh(&addrconf_lock);
2023 dev->ip6_ptr = NULL;
2024 idev->dead = 1;
2025 write_unlock_bh(&addrconf_lock);
2026
2027 /* Step 1.5: remove snmp6 entry */
2028 snmp6_unregister_dev(idev);
2029
2030 }
2031
2032 /* Step 2: clear hash table */
2033 for (i=0; i<IN6_ADDR_HSIZE; i++) {
2034 bifa = &inet6_addr_lst[i];
2035
2036 write_lock_bh(&addrconf_hash_lock);
2037 while ((ifa = *bifa) != NULL) {
2038 if (ifa->idev == idev) {
2039 *bifa = ifa->lst_next;
2040 ifa->lst_next = NULL;
2041 addrconf_del_timer(ifa);
2042 in6_ifa_put(ifa);
2043 continue;
2044 }
2045 bifa = &ifa->lst_next;
2046 }
2047 write_unlock_bh(&addrconf_hash_lock);
2048 }
2049
2050 write_lock_bh(&idev->lock);
2051
2052 /* Step 3: clear flags for stateless addrconf */
2053 if (how != 1)
2054 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD);
2055
2056 /* Step 4: clear address list */
2057 #ifdef CONFIG_IPV6_PRIVACY
2058 if (how == 1 && del_timer(&idev->regen_timer))
2059 in6_dev_put(idev);
2060
2061 /* clear tempaddr list */
2062 while ((ifa = idev->tempaddr_list) != NULL) {
2063 idev->tempaddr_list = ifa->tmp_next;
2064 ifa->tmp_next = NULL;
2065 ifa->dead = 1;
2066 write_unlock_bh(&idev->lock);
2067 spin_lock_bh(&ifa->lock);
2068
2069 if (ifa->ifpub) {
2070 in6_ifa_put(ifa->ifpub);
2071 ifa->ifpub = NULL;
2072 }
2073 spin_unlock_bh(&ifa->lock);
2074 in6_ifa_put(ifa);
2075 write_lock_bh(&idev->lock);
2076 }
2077 #endif
2078 while ((ifa = idev->addr_list) != NULL) {
2079 idev->addr_list = ifa->if_next;
2080 ifa->if_next = NULL;
2081 ifa->dead = 1;
2082 addrconf_del_timer(ifa);
2083 write_unlock_bh(&idev->lock);
2084
2085 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2086 in6_ifa_put(ifa);
2087
2088 write_lock_bh(&idev->lock);
2089 }
2090 write_unlock_bh(&idev->lock);
2091
2092 /* Step 5: Discard multicast list */
2093
2094 if (how == 1)
2095 ipv6_mc_destroy_dev(idev);
2096 else
2097 ipv6_mc_down(idev);
2098
2099 /* Step 5: netlink notification of this interface */
2100 idev->tstamp = jiffies;
2101 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2102
2103 /* Shot the device (if unregistered) */
2104
2105 if (how == 1) {
2106 #ifdef CONFIG_SYSCTL
2107 addrconf_sysctl_unregister(&idev->cnf);
2108 neigh_sysctl_unregister(idev->nd_parms);
2109 #endif
2110 neigh_parms_release(&nd_tbl, idev->nd_parms);
2111 neigh_ifdown(&nd_tbl, dev);
2112 in6_dev_put(idev);
2113 }
2114 return 0;
2115 }
2116
2117 static void addrconf_rs_timer(unsigned long data)
2118 {
2119 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2120
2121 if (ifp->idev->cnf.forwarding)
2122 goto out;
2123
2124 if (ifp->idev->if_flags & IF_RA_RCVD) {
2125 /*
2126 * Announcement received after solicitation
2127 * was sent
2128 */
2129 goto out;
2130 }
2131
2132 spin_lock(&ifp->lock);
2133 if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2134 struct in6_addr all_routers;
2135
2136 /* The wait after the last probe can be shorter */
2137 addrconf_mod_timer(ifp, AC_RS,
2138 (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2139 ifp->idev->cnf.rtr_solicit_delay :
2140 ifp->idev->cnf.rtr_solicit_interval);
2141 spin_unlock(&ifp->lock);
2142
2143 ipv6_addr_all_routers(&all_routers);
2144
2145 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2146 } else {
2147 spin_unlock(&ifp->lock);
2148 /*
2149 * Note: we do not support deprecated "all on-link"
2150 * assumption any longer.
2151 */
2152 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2153 ifp->idev->dev->name);
2154 }
2155
2156 out:
2157 in6_ifa_put(ifp);
2158 }
2159
2160 /*
2161 * Duplicate Address Detection
2162 */
2163 static void addrconf_dad_start(struct inet6_ifaddr *ifp, int flags)
2164 {
2165 struct inet6_dev *idev = ifp->idev;
2166 struct net_device *dev = idev->dev;
2167 unsigned long rand_num;
2168
2169 addrconf_join_solict(dev, &ifp->addr);
2170
2171 if (ifp->prefix_len != 128 && (ifp->flags&IFA_F_PERMANENT))
2172 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 0,
2173 flags);
2174
2175 net_srandom(ifp->addr.s6_addr32[3]);
2176 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2177
2178 read_lock_bh(&idev->lock);
2179 if (ifp->dead)
2180 goto out;
2181 spin_lock_bh(&ifp->lock);
2182
2183 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2184 !(ifp->flags&IFA_F_TENTATIVE)) {
2185 ifp->flags &= ~IFA_F_TENTATIVE;
2186 spin_unlock_bh(&ifp->lock);
2187 read_unlock_bh(&idev->lock);
2188
2189 addrconf_dad_completed(ifp);
2190 return;
2191 }
2192
2193 ifp->probes = idev->cnf.dad_transmits;
2194 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2195
2196 spin_unlock_bh(&ifp->lock);
2197 out:
2198 read_unlock_bh(&idev->lock);
2199 }
2200
2201 static void addrconf_dad_timer(unsigned long data)
2202 {
2203 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2204 struct inet6_dev *idev = ifp->idev;
2205 struct in6_addr unspec;
2206 struct in6_addr mcaddr;
2207
2208 read_lock_bh(&idev->lock);
2209 if (idev->dead) {
2210 read_unlock_bh(&idev->lock);
2211 goto out;
2212 }
2213 spin_lock_bh(&ifp->lock);
2214 if (ifp->probes == 0) {
2215 /*
2216 * DAD was successful
2217 */
2218
2219 ifp->flags &= ~IFA_F_TENTATIVE;
2220 spin_unlock_bh(&ifp->lock);
2221 read_unlock_bh(&idev->lock);
2222
2223 addrconf_dad_completed(ifp);
2224
2225 goto out;
2226 }
2227
2228 ifp->probes--;
2229 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2230 spin_unlock_bh(&ifp->lock);
2231 read_unlock_bh(&idev->lock);
2232
2233 /* send a neighbour solicitation for our addr */
2234 memset(&unspec, 0, sizeof(unspec));
2235 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2236 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec);
2237 out:
2238 in6_ifa_put(ifp);
2239 }
2240
2241 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2242 {
2243 struct net_device * dev = ifp->idev->dev;
2244
2245 /*
2246 * Configure the address for reception. Now it is valid.
2247 */
2248
2249 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2250
2251 /* If added prefix is link local and forwarding is off,
2252 start sending router solicitations.
2253 */
2254
2255 if (ifp->idev->cnf.forwarding == 0 &&
2256 ifp->idev->cnf.rtr_solicits > 0 &&
2257 (dev->flags&IFF_LOOPBACK) == 0 &&
2258 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2259 struct in6_addr all_routers;
2260
2261 ipv6_addr_all_routers(&all_routers);
2262
2263 /*
2264 * If a host as already performed a random delay
2265 * [...] as part of DAD [...] there is no need
2266 * to delay again before sending the first RS
2267 */
2268 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2269
2270 spin_lock_bh(&ifp->lock);
2271 ifp->probes = 1;
2272 ifp->idev->if_flags |= IF_RS_SENT;
2273 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2274 spin_unlock_bh(&ifp->lock);
2275 }
2276 }
2277
2278 #ifdef CONFIG_PROC_FS
2279 struct if6_iter_state {
2280 int bucket;
2281 };
2282
2283 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2284 {
2285 struct inet6_ifaddr *ifa = NULL;
2286 struct if6_iter_state *state = seq->private;
2287
2288 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2289 ifa = inet6_addr_lst[state->bucket];
2290 if (ifa)
2291 break;
2292 }
2293 return ifa;
2294 }
2295
2296 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2297 {
2298 struct if6_iter_state *state = seq->private;
2299
2300 ifa = ifa->lst_next;
2301 try_again:
2302 if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2303 ifa = inet6_addr_lst[state->bucket];
2304 goto try_again;
2305 }
2306 return ifa;
2307 }
2308
2309 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2310 {
2311 struct inet6_ifaddr *ifa = if6_get_first(seq);
2312
2313 if (ifa)
2314 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2315 --pos;
2316 return pos ? NULL : ifa;
2317 }
2318
2319 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2320 {
2321 read_lock_bh(&addrconf_hash_lock);
2322 return if6_get_idx(seq, *pos);
2323 }
2324
2325 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2326 {
2327 struct inet6_ifaddr *ifa;
2328
2329 ifa = if6_get_next(seq, v);
2330 ++*pos;
2331 return ifa;
2332 }
2333
2334 static void if6_seq_stop(struct seq_file *seq, void *v)
2335 {
2336 read_unlock_bh(&addrconf_hash_lock);
2337 }
2338
2339 static int if6_seq_show(struct seq_file *seq, void *v)
2340 {
2341 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2342 seq_printf(seq,
2343 "%04x%04x%04x%04x%04x%04x%04x%04x %02x %02x %02x %02x %8s\n",
2344 NIP6(ifp->addr),
2345 ifp->idev->dev->ifindex,
2346 ifp->prefix_len,
2347 ifp->scope,
2348 ifp->flags,
2349 ifp->idev->dev->name);
2350 return 0;
2351 }
2352
2353 static struct seq_operations if6_seq_ops = {
2354 .start = if6_seq_start,
2355 .next = if6_seq_next,
2356 .show = if6_seq_show,
2357 .stop = if6_seq_stop,
2358 };
2359
2360 static int if6_seq_open(struct inode *inode, struct file *file)
2361 {
2362 struct seq_file *seq;
2363 int rc = -ENOMEM;
2364 struct if6_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL);
2365
2366 if (!s)
2367 goto out;
2368 memset(s, 0, sizeof(*s));
2369
2370 rc = seq_open(file, &if6_seq_ops);
2371 if (rc)
2372 goto out_kfree;
2373
2374 seq = file->private_data;
2375 seq->private = s;
2376 out:
2377 return rc;
2378 out_kfree:
2379 kfree(s);
2380 goto out;
2381 }
2382
2383 static struct file_operations if6_fops = {
2384 .owner = THIS_MODULE,
2385 .open = if6_seq_open,
2386 .read = seq_read,
2387 .llseek = seq_lseek,
2388 .release = seq_release_private,
2389 };
2390
2391 int __init if6_proc_init(void)
2392 {
2393 if (!proc_net_fops_create("if_inet6", S_IRUGO, &if6_fops))
2394 return -ENOMEM;
2395 return 0;
2396 }
2397
2398 void if6_proc_exit(void)
2399 {
2400 proc_net_remove("if_inet6");
2401 }
2402 #endif /* CONFIG_PROC_FS */
2403
2404 /*
2405 * Periodic address status verification
2406 */
2407
2408 static void addrconf_verify(unsigned long foo)
2409 {
2410 struct inet6_ifaddr *ifp;
2411 unsigned long now, next;
2412 int i;
2413
2414 spin_lock_bh(&addrconf_verify_lock);
2415 now = jiffies;
2416 next = now + ADDR_CHECK_FREQUENCY;
2417
2418 del_timer(&addr_chk_timer);
2419
2420 for (i=0; i < IN6_ADDR_HSIZE; i++) {
2421
2422 restart:
2423 write_lock(&addrconf_hash_lock);
2424 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
2425 unsigned long age;
2426 #ifdef CONFIG_IPV6_PRIVACY
2427 unsigned long regen_advance;
2428 #endif
2429
2430 if (ifp->flags & IFA_F_PERMANENT)
2431 continue;
2432
2433 spin_lock(&ifp->lock);
2434 age = (now - ifp->tstamp) / HZ;
2435
2436 #ifdef CONFIG_IPV6_PRIVACY
2437 regen_advance = ifp->idev->cnf.regen_max_retry *
2438 ifp->idev->cnf.dad_transmits *
2439 ifp->idev->nd_parms->retrans_time / HZ;
2440 #endif
2441
2442 if (age >= ifp->valid_lft) {
2443 spin_unlock(&ifp->lock);
2444 in6_ifa_hold(ifp);
2445 write_unlock(&addrconf_hash_lock);
2446 ipv6_del_addr(ifp);
2447 goto restart;
2448 } else if (age >= ifp->prefered_lft) {
2449 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
2450 int deprecate = 0;
2451
2452 if (!(ifp->flags&IFA_F_DEPRECATED)) {
2453 deprecate = 1;
2454 ifp->flags |= IFA_F_DEPRECATED;
2455 }
2456
2457 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
2458 next = ifp->tstamp + ifp->valid_lft * HZ;
2459
2460 spin_unlock(&ifp->lock);
2461
2462 if (deprecate) {
2463 in6_ifa_hold(ifp);
2464 write_unlock(&addrconf_hash_lock);
2465
2466 ipv6_ifa_notify(0, ifp);
2467 in6_ifa_put(ifp);
2468 goto restart;
2469 }
2470 #ifdef CONFIG_IPV6_PRIVACY
2471 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
2472 !(ifp->flags&IFA_F_TENTATIVE)) {
2473 if (age >= ifp->prefered_lft - regen_advance) {
2474 struct inet6_ifaddr *ifpub = ifp->ifpub;
2475 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2476 next = ifp->tstamp + ifp->prefered_lft * HZ;
2477 if (!ifp->regen_count && ifpub) {
2478 ifp->regen_count++;
2479 in6_ifa_hold(ifp);
2480 in6_ifa_hold(ifpub);
2481 spin_unlock(&ifp->lock);
2482 write_unlock(&addrconf_hash_lock);
2483 ipv6_create_tempaddr(ifpub, ifp);
2484 in6_ifa_put(ifpub);
2485 in6_ifa_put(ifp);
2486 goto restart;
2487 }
2488 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
2489 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
2490 spin_unlock(&ifp->lock);
2491 #endif
2492 } else {
2493 /* ifp->prefered_lft <= ifp->valid_lft */
2494 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2495 next = ifp->tstamp + ifp->prefered_lft * HZ;
2496 spin_unlock(&ifp->lock);
2497 }
2498 }
2499 write_unlock(&addrconf_hash_lock);
2500 }
2501
2502 addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
2503 add_timer(&addr_chk_timer);
2504 spin_unlock_bh(&addrconf_verify_lock);
2505 }
2506
2507 static int
2508 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
2509 {
2510 struct rtattr **rta = arg;
2511 struct ifaddrmsg *ifm = NLMSG_DATA(nlh);
2512 struct in6_addr *pfx;
2513
2514 pfx = NULL;
2515 if (rta[IFA_ADDRESS-1]) {
2516 if (RTA_PAYLOAD(rta[IFA_ADDRESS-1]) < sizeof(*pfx))
2517 return -EINVAL;
2518 pfx = RTA_DATA(rta[IFA_ADDRESS-1]);
2519 }
2520 if (rta[IFA_LOCAL-1]) {
2521 if (pfx && memcmp(pfx, RTA_DATA(rta[IFA_LOCAL-1]), sizeof(*pfx)))
2522 return -EINVAL;
2523 pfx = RTA_DATA(rta[IFA_LOCAL-1]);
2524 }
2525 if (pfx == NULL)
2526 return -EINVAL;
2527
2528 return inet6_addr_del(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
2529 }
2530
2531 static int
2532 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
2533 {
2534 struct rtattr **rta = arg;
2535 struct ifaddrmsg *ifm = NLMSG_DATA(nlh);
2536 struct in6_addr *pfx;
2537
2538 pfx = NULL;
2539 if (rta[IFA_ADDRESS-1]) {
2540 if (RTA_PAYLOAD(rta[IFA_ADDRESS-1]) < sizeof(*pfx))
2541 return -EINVAL;
2542 pfx = RTA_DATA(rta[IFA_ADDRESS-1]);
2543 }
2544 if (rta[IFA_LOCAL-1]) {
2545 if (pfx && memcmp(pfx, RTA_DATA(rta[IFA_LOCAL-1]), sizeof(*pfx)))
2546 return -EINVAL;
2547 pfx = RTA_DATA(rta[IFA_LOCAL-1]);
2548 }
2549 if (pfx == NULL)
2550 return -EINVAL;
2551
2552 return inet6_addr_add(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
2553 }
2554
2555 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
2556 u32 pid, u32 seq, int event)
2557 {
2558 struct ifaddrmsg *ifm;
2559 struct nlmsghdr *nlh;
2560 struct ifa_cacheinfo ci;
2561 unsigned char *b = skb->tail;
2562
2563 nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(*ifm));
2564 if (pid) nlh->nlmsg_flags |= NLM_F_MULTI;
2565 ifm = NLMSG_DATA(nlh);
2566 ifm->ifa_family = AF_INET6;
2567 ifm->ifa_prefixlen = ifa->prefix_len;
2568 ifm->ifa_flags = ifa->flags;
2569 ifm->ifa_scope = RT_SCOPE_UNIVERSE;
2570 if (ifa->scope&IFA_HOST)
2571 ifm->ifa_scope = RT_SCOPE_HOST;
2572 else if (ifa->scope&IFA_LINK)
2573 ifm->ifa_scope = RT_SCOPE_LINK;
2574 else if (ifa->scope&IFA_SITE)
2575 ifm->ifa_scope = RT_SCOPE_SITE;
2576 ifm->ifa_index = ifa->idev->dev->ifindex;
2577 RTA_PUT(skb, IFA_ADDRESS, 16, &ifa->addr);
2578 if (!(ifa->flags&IFA_F_PERMANENT)) {
2579 ci.ifa_prefered = ifa->prefered_lft;
2580 ci.ifa_valid = ifa->valid_lft;
2581 if (ci.ifa_prefered != INFINITY_LIFE_TIME) {
2582 long tval = (jiffies - ifa->tstamp)/HZ;
2583 ci.ifa_prefered -= tval;
2584 if (ci.ifa_valid != INFINITY_LIFE_TIME)
2585 ci.ifa_valid -= tval;
2586 }
2587 } else {
2588 ci.ifa_prefered = INFINITY_LIFE_TIME;
2589 ci.ifa_valid = INFINITY_LIFE_TIME;
2590 }
2591 ci.cstamp = (__u32)(TIME_DELTA(ifa->cstamp, INITIAL_JIFFIES) / HZ * 100
2592 + TIME_DELTA(ifa->cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
2593 ci.tstamp = (__u32)(TIME_DELTA(ifa->tstamp, INITIAL_JIFFIES) / HZ * 100
2594 + TIME_DELTA(ifa->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
2595 RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci);
2596 nlh->nlmsg_len = skb->tail - b;
2597 return skb->len;
2598
2599 nlmsg_failure:
2600 rtattr_failure:
2601 skb_trim(skb, b - skb->data);
2602 return -1;
2603 }
2604
2605 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
2606 u32 pid, u32 seq, int event)
2607 {
2608 struct ifaddrmsg *ifm;
2609 struct nlmsghdr *nlh;
2610 struct ifa_cacheinfo ci;
2611 unsigned char *b = skb->tail;
2612
2613 nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(*ifm));
2614 if (pid) nlh->nlmsg_flags |= NLM_F_MULTI;
2615 ifm = NLMSG_DATA(nlh);
2616 ifm->ifa_family = AF_INET6;
2617 ifm->ifa_prefixlen = 128;
2618 ifm->ifa_flags = IFA_F_PERMANENT;
2619 ifm->ifa_scope = RT_SCOPE_UNIVERSE;
2620 if (ipv6_addr_scope(&ifmca->mca_addr)&IFA_SITE)
2621 ifm->ifa_scope = RT_SCOPE_SITE;
2622 ifm->ifa_index = ifmca->idev->dev->ifindex;
2623 RTA_PUT(skb, IFA_MULTICAST, 16, &ifmca->mca_addr);
2624 ci.cstamp = (__u32)(TIME_DELTA(ifmca->mca_cstamp, INITIAL_JIFFIES) / HZ
2625 * 100 + TIME_DELTA(ifmca->mca_cstamp, INITIAL_JIFFIES) % HZ
2626 * 100 / HZ);
2627 ci.tstamp = (__u32)(TIME_DELTA(ifmca->mca_tstamp, INITIAL_JIFFIES) / HZ
2628 * 100 + TIME_DELTA(ifmca->mca_tstamp, INITIAL_JIFFIES) % HZ
2629 * 100 / HZ);
2630 ci.ifa_prefered = INFINITY_LIFE_TIME;
2631 ci.ifa_valid = INFINITY_LIFE_TIME;
2632 RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci);
2633 nlh->nlmsg_len = skb->tail - b;
2634 return skb->len;
2635
2636 nlmsg_failure:
2637 rtattr_failure:
2638 skb_trim(skb, b - skb->data);
2639 return -1;
2640 }
2641
2642 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
2643 u32 pid, u32 seq, int event)
2644 {
2645 struct ifaddrmsg *ifm;
2646 struct nlmsghdr *nlh;
2647 struct ifa_cacheinfo ci;
2648 unsigned char *b = skb->tail;
2649
2650 nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(*ifm));
2651 if (pid) nlh->nlmsg_flags |= NLM_F_MULTI;
2652 ifm = NLMSG_DATA(nlh);
2653 ifm->ifa_family = AF_INET6;
2654 ifm->ifa_prefixlen = 128;
2655 ifm->ifa_flags = IFA_F_PERMANENT;
2656 ifm->ifa_scope = RT_SCOPE_UNIVERSE;
2657 if (ipv6_addr_scope(&ifaca->aca_addr)&IFA_SITE)
2658 ifm->ifa_scope = RT_SCOPE_SITE;
2659 ifm->ifa_index = ifaca->aca_idev->dev->ifindex;
2660 RTA_PUT(skb, IFA_ANYCAST, 16, &ifaca->aca_addr);
2661 ci.cstamp = (__u32)(TIME_DELTA(ifaca->aca_cstamp, INITIAL_JIFFIES) / HZ
2662 * 100 + TIME_DELTA(ifaca->aca_cstamp, INITIAL_JIFFIES) % HZ
2663 * 100 / HZ);
2664 ci.tstamp = (__u32)(TIME_DELTA(ifaca->aca_tstamp, INITIAL_JIFFIES) / HZ
2665 * 100 + TIME_DELTA(ifaca->aca_tstamp, INITIAL_JIFFIES) % HZ
2666 * 100 / HZ);
2667 ci.ifa_prefered = INFINITY_LIFE_TIME;
2668 ci.ifa_valid = INFINITY_LIFE_TIME;
2669 RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci);
2670 nlh->nlmsg_len = skb->tail - b;
2671 return skb->len;
2672
2673 nlmsg_failure:
2674 rtattr_failure:
2675 skb_trim(skb, b - skb->data);
2676 return -1;
2677 }
2678
2679 enum addr_type_t
2680 {
2681 UNICAST_ADDR,
2682 MULTICAST_ADDR,
2683 ANYCAST_ADDR,
2684 };
2685
2686 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
2687 enum addr_type_t type)
2688 {
2689 int idx, ip_idx;
2690 int s_idx, s_ip_idx;
2691 int err = 1;
2692 struct net_device *dev;
2693 struct inet6_dev *idev = NULL;
2694 struct inet6_ifaddr *ifa;
2695 struct ifmcaddr6 *ifmca;
2696 struct ifacaddr6 *ifaca;
2697
2698 s_idx = cb->args[0];
2699 s_ip_idx = ip_idx = cb->args[1];
2700 read_lock(&dev_base_lock);
2701
2702 for (dev = dev_base, idx = 0; dev; dev = dev->next, idx++) {
2703 if (idx < s_idx)
2704 continue;
2705 if (idx > s_idx)
2706 s_ip_idx = 0;
2707 ip_idx = 0;
2708 if ((idev = in6_dev_get(dev)) == NULL)
2709 continue;
2710 read_lock_bh(&idev->lock);
2711 switch (type) {
2712 case UNICAST_ADDR:
2713 /* unicast address */
2714 for (ifa = idev->addr_list; ifa;
2715 ifa = ifa->if_next, ip_idx++) {
2716 if (ip_idx < s_ip_idx)
2717 continue;
2718 if ((err = inet6_fill_ifaddr(skb, ifa,
2719 NETLINK_CB(cb->skb).pid,
2720 cb->nlh->nlmsg_seq, RTM_NEWADDR)) <= 0)
2721 goto done;
2722 }
2723 /* temp addr */
2724 #ifdef CONFIG_IPV6_PRIVACY
2725 for (ifa = idev->tempaddr_list; ifa;
2726 ifa = ifa->tmp_next, ip_idx++) {
2727 if (ip_idx < s_ip_idx)
2728 continue;
2729 if ((err = inet6_fill_ifaddr(skb, ifa,
2730 NETLINK_CB(cb->skb).pid,
2731 cb->nlh->nlmsg_seq, RTM_NEWADDR)) <= 0)
2732 goto done;
2733 }
2734 #endif
2735 break;
2736 case MULTICAST_ADDR:
2737 /* multicast address */
2738 for (ifmca = idev->mc_list; ifmca;
2739 ifmca = ifmca->next, ip_idx++) {
2740 if (ip_idx < s_ip_idx)
2741 continue;
2742 if ((err = inet6_fill_ifmcaddr(skb, ifmca,
2743 NETLINK_CB(cb->skb).pid,
2744 cb->nlh->nlmsg_seq, RTM_GETMULTICAST)) <= 0)
2745 goto done;
2746 }
2747 break;
2748 case ANYCAST_ADDR:
2749 /* anycast address */
2750 for (ifaca = idev->ac_list; ifaca;
2751 ifaca = ifaca->aca_next, ip_idx++) {
2752 if (ip_idx < s_ip_idx)
2753 continue;
2754 if ((err = inet6_fill_ifacaddr(skb, ifaca,
2755 NETLINK_CB(cb->skb).pid,
2756 cb->nlh->nlmsg_seq, RTM_GETANYCAST)) <= 0)
2757 goto done;
2758 }
2759 break;
2760 default:
2761 break;
2762 }
2763 read_unlock_bh(&idev->lock);
2764 in6_dev_put(idev);
2765 }
2766 done:
2767 if (err <= 0) {
2768 read_unlock_bh(&idev->lock);
2769 in6_dev_put(idev);
2770 }
2771 read_unlock(&dev_base_lock);
2772 cb->args[0] = idx;
2773 cb->args[1] = ip_idx;
2774 return skb->len;
2775 }
2776
2777 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
2778 {
2779 enum addr_type_t type = UNICAST_ADDR;
2780 return inet6_dump_addr(skb, cb, type);
2781 }
2782
2783 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
2784 {
2785 enum addr_type_t type = MULTICAST_ADDR;
2786 return inet6_dump_addr(skb, cb, type);
2787 }
2788
2789
2790 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
2791 {
2792 enum addr_type_t type = ANYCAST_ADDR;
2793 return inet6_dump_addr(skb, cb, type);
2794 }
2795
2796 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
2797 {
2798 struct sk_buff *skb;
2799 int size = NLMSG_SPACE(sizeof(struct ifaddrmsg)+128);
2800
2801 skb = alloc_skb(size, GFP_ATOMIC);
2802 if (!skb) {
2803 netlink_set_err(rtnl, 0, RTMGRP_IPV6_IFADDR, ENOBUFS);
2804 return;
2805 }
2806 if (inet6_fill_ifaddr(skb, ifa, 0, 0, event) < 0) {
2807 kfree_skb(skb);
2808 netlink_set_err(rtnl, 0, RTMGRP_IPV6_IFADDR, EINVAL);
2809 return;
2810 }
2811 NETLINK_CB(skb).dst_groups = RTMGRP_IPV6_IFADDR;
2812 netlink_broadcast(rtnl, skb, 0, RTMGRP_IPV6_IFADDR, GFP_ATOMIC);
2813 }
2814
2815 static void inline ipv6_store_devconf(struct ipv6_devconf *cnf,
2816 __s32 *array, int bytes)
2817 {
2818 memset(array, 0, bytes);
2819 array[DEVCONF_FORWARDING] = cnf->forwarding;
2820 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
2821 array[DEVCONF_MTU6] = cnf->mtu6;
2822 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
2823 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
2824 array[DEVCONF_AUTOCONF] = cnf->autoconf;
2825 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
2826 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
2827 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
2828 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
2829 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
2830 #ifdef CONFIG_IPV6_PRIVACY
2831 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
2832 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
2833 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
2834 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
2835 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
2836 #endif
2837 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
2838 }
2839
2840 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
2841 u32 pid, u32 seq, int event)
2842 {
2843 struct net_device *dev = idev->dev;
2844 __s32 *array = NULL;
2845 struct ifinfomsg *r;
2846 struct nlmsghdr *nlh;
2847 unsigned char *b = skb->tail;
2848 struct rtattr *subattr;
2849 __u32 mtu = dev->mtu;
2850 struct ifla_cacheinfo ci;
2851
2852 nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(*r));
2853 if (pid) nlh->nlmsg_flags |= NLM_F_MULTI;
2854 r = NLMSG_DATA(nlh);
2855 r->ifi_family = AF_INET6;
2856 r->ifi_type = dev->type;
2857 r->ifi_index = dev->ifindex;
2858 r->ifi_flags = dev->flags;
2859 r->ifi_change = 0;
2860 if (!netif_running(dev) || !netif_carrier_ok(dev))
2861 r->ifi_flags &= ~IFF_RUNNING;
2862 else
2863 r->ifi_flags |= IFF_RUNNING;
2864
2865 RTA_PUT(skb, IFLA_IFNAME, strlen(dev->name)+1, dev->name);
2866
2867 if (dev->addr_len)
2868 RTA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
2869
2870 RTA_PUT(skb, IFLA_MTU, sizeof(mtu), &mtu);
2871 if (dev->ifindex != dev->iflink)
2872 RTA_PUT(skb, IFLA_LINK, sizeof(int), &dev->iflink);
2873
2874 subattr = (struct rtattr*)skb->tail;
2875
2876 RTA_PUT(skb, IFLA_PROTINFO, 0, NULL);
2877
2878 /* return the device flags */
2879 RTA_PUT(skb, IFLA_INET6_FLAGS, sizeof(__u32), &idev->if_flags);
2880
2881 /* return interface cacheinfo */
2882 ci.max_reasm_len = IPV6_MAXPLEN;
2883 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
2884 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
2885 ci.reachable_time = idev->nd_parms->reachable_time;
2886 ci.retrans_time = idev->nd_parms->retrans_time;
2887 RTA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
2888
2889 /* return the device sysctl params */
2890 if ((array = kmalloc(DEVCONF_MAX * sizeof(*array), GFP_ATOMIC)) == NULL)
2891 goto rtattr_failure;
2892 ipv6_store_devconf(&idev->cnf, array, DEVCONF_MAX * sizeof(*array));
2893 RTA_PUT(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(*array), array);
2894
2895 /* XXX - Statistics/MC not implemented */
2896 subattr->rta_len = skb->tail - (u8*)subattr;
2897
2898 nlh->nlmsg_len = skb->tail - b;
2899 kfree(array);
2900 return skb->len;
2901
2902 nlmsg_failure:
2903 rtattr_failure:
2904 if (array)
2905 kfree(array);
2906 skb_trim(skb, b - skb->data);
2907 return -1;
2908 }
2909
2910 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
2911 {
2912 int idx, err;
2913 int s_idx = cb->args[0];
2914 struct net_device *dev;
2915 struct inet6_dev *idev;
2916
2917 read_lock(&dev_base_lock);
2918 for (dev=dev_base, idx=0; dev; dev = dev->next, idx++) {
2919 if (idx < s_idx)
2920 continue;
2921 if ((idev = in6_dev_get(dev)) == NULL)
2922 continue;
2923 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
2924 cb->nlh->nlmsg_seq, RTM_NEWLINK);
2925 in6_dev_put(idev);
2926 if (err <= 0)
2927 break;
2928 }
2929 read_unlock(&dev_base_lock);
2930 cb->args[0] = idx;
2931
2932 return skb->len;
2933 }
2934
2935 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
2936 {
2937 struct sk_buff *skb;
2938 /* 128 bytes ?? */
2939 int size = NLMSG_SPACE(sizeof(struct ifinfomsg)+128);
2940
2941 skb = alloc_skb(size, GFP_ATOMIC);
2942 if (!skb) {
2943 netlink_set_err(rtnl, 0, RTMGRP_IPV6_IFINFO, ENOBUFS);
2944 return;
2945 }
2946 if (inet6_fill_ifinfo(skb, idev, 0, 0, event) < 0) {
2947 kfree_skb(skb);
2948 netlink_set_err(rtnl, 0, RTMGRP_IPV6_IFINFO, EINVAL);
2949 return;
2950 }
2951 NETLINK_CB(skb).dst_groups = RTMGRP_IPV6_IFINFO;
2952 netlink_broadcast(rtnl, skb, 0, RTMGRP_IPV6_IFINFO, GFP_ATOMIC);
2953 }
2954
2955 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
2956 struct prefix_info *pinfo, u32 pid, u32 seq, int event)
2957 {
2958 struct prefixmsg *pmsg;
2959 struct nlmsghdr *nlh;
2960 unsigned char *b = skb->tail;
2961 struct prefix_cacheinfo ci;
2962
2963 nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(*pmsg));
2964
2965 if (pid)
2966 nlh->nlmsg_flags |= NLM_F_MULTI;
2967
2968 pmsg = NLMSG_DATA(nlh);
2969 pmsg->prefix_family = AF_INET6;
2970 pmsg->prefix_ifindex = idev->dev->ifindex;
2971 pmsg->prefix_len = pinfo->prefix_len;
2972 pmsg->prefix_type = pinfo->type;
2973
2974 pmsg->prefix_flags = 0;
2975 if (pinfo->onlink)
2976 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
2977 if (pinfo->autoconf)
2978 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
2979
2980 RTA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
2981
2982 ci.preferred_time = ntohl(pinfo->prefered);
2983 ci.valid_time = ntohl(pinfo->valid);
2984 RTA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
2985
2986 nlh->nlmsg_len = skb->tail - b;
2987 return skb->len;
2988
2989 nlmsg_failure:
2990 rtattr_failure:
2991 skb_trim(skb, b - skb->data);
2992 return -1;
2993 }
2994
2995 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
2996 struct prefix_info *pinfo)
2997 {
2998 struct sk_buff *skb;
2999 int size = NLMSG_SPACE(sizeof(struct prefixmsg)+128);
3000
3001 skb = alloc_skb(size, GFP_ATOMIC);
3002 if (!skb) {
3003 netlink_set_err(rtnl, 0, RTMGRP_IPV6_PREFIX, ENOBUFS);
3004 return;
3005 }
3006 if (inet6_fill_prefix(skb, idev, pinfo, 0, 0, event) < 0) {
3007 kfree_skb(skb);
3008 netlink_set_err(rtnl, 0, RTMGRP_IPV6_PREFIX, EINVAL);
3009 return;
3010 }
3011 NETLINK_CB(skb).dst_groups = RTMGRP_IPV6_PREFIX;
3012 netlink_broadcast(rtnl, skb, 0, RTMGRP_IPV6_PREFIX, GFP_ATOMIC);
3013 }
3014
3015 static struct rtnetlink_link inet6_rtnetlink_table[RTM_MAX - RTM_BASE + 1] = {
3016 [RTM_GETLINK - RTM_BASE] = { .dumpit = inet6_dump_ifinfo, },
3017 [RTM_NEWADDR - RTM_BASE] = { .doit = inet6_rtm_newaddr, },
3018 [RTM_DELADDR - RTM_BASE] = { .doit = inet6_rtm_deladdr, },
3019 [RTM_GETADDR - RTM_BASE] = { .dumpit = inet6_dump_ifaddr, },
3020 [RTM_GETMULTICAST - RTM_BASE] = { .dumpit = inet6_dump_ifmcaddr, },
3021 [RTM_GETANYCAST - RTM_BASE] = { .dumpit = inet6_dump_ifacaddr, },
3022 [RTM_NEWROUTE - RTM_BASE] = { .doit = inet6_rtm_newroute, },
3023 [RTM_DELROUTE - RTM_BASE] = { .doit = inet6_rtm_delroute, },
3024 [RTM_GETROUTE - RTM_BASE] = { .doit = inet6_rtm_getroute,
3025 .dumpit = inet6_dump_fib, },
3026 };
3027
3028 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3029 {
3030 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3031
3032 switch (event) {
3033 case RTM_NEWADDR:
3034 dst_hold(&ifp->rt->u.dst);
3035 if (ip6_ins_rt(ifp->rt, NULL, NULL))
3036 dst_release(&ifp->rt->u.dst);
3037 if (ifp->idev->cnf.forwarding)
3038 addrconf_join_anycast(ifp);
3039 break;
3040 case RTM_DELADDR:
3041 if (ifp->idev->cnf.forwarding)
3042 addrconf_leave_anycast(ifp);
3043 addrconf_leave_solict(ifp->idev, &ifp->addr);
3044 dst_hold(&ifp->rt->u.dst);
3045 if (ip6_del_rt(ifp->rt, NULL, NULL))
3046 dst_free(&ifp->rt->u.dst);
3047 else
3048 dst_release(&ifp->rt->u.dst);
3049 break;
3050 }
3051 }
3052
3053 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3054 {
3055 read_lock_bh(&addrconf_lock);
3056 if (likely(ifp->idev->dead == 0))
3057 __ipv6_ifa_notify(event, ifp);
3058 read_unlock_bh(&addrconf_lock);
3059 }
3060
3061 #ifdef CONFIG_SYSCTL
3062
3063 static
3064 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3065 void __user *buffer, size_t *lenp, loff_t *ppos)
3066 {
3067 int *valp = ctl->data;
3068 int val = *valp;
3069 int ret;
3070
3071 ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3072
3073 if (write && valp != &ipv6_devconf_dflt.forwarding) {
3074 if (valp != &ipv6_devconf.forwarding) {
3075 if ((!*valp) ^ (!val)) {
3076 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
3077 if (idev == NULL)
3078 return ret;
3079 dev_forward_change(idev);
3080 }
3081 } else {
3082 ipv6_devconf_dflt.forwarding = ipv6_devconf.forwarding;
3083 addrconf_forward_change();
3084 }
3085 if (*valp)
3086 rt6_purge_dflt_routers();
3087 }
3088
3089 return ret;
3090 }
3091
3092 static int addrconf_sysctl_forward_strategy(ctl_table *table,
3093 int __user *name, int nlen,
3094 void __user *oldval,
3095 size_t __user *oldlenp,
3096 void __user *newval, size_t newlen,
3097 void **context)
3098 {
3099 int *valp = table->data;
3100 int new;
3101
3102 if (!newval || !newlen)
3103 return 0;
3104 if (newlen != sizeof(int))
3105 return -EINVAL;
3106 if (get_user(new, (int __user *)newval))
3107 return -EFAULT;
3108 if (new == *valp)
3109 return 0;
3110 if (oldval && oldlenp) {
3111 size_t len;
3112 if (get_user(len, oldlenp))
3113 return -EFAULT;
3114 if (len) {
3115 if (len > table->maxlen)
3116 len = table->maxlen;
3117 if (copy_to_user(oldval, valp, len))
3118 return -EFAULT;
3119 if (put_user(len, oldlenp))
3120 return -EFAULT;
3121 }
3122 }
3123
3124 if (valp != &ipv6_devconf_dflt.forwarding) {
3125 if (valp != &ipv6_devconf.forwarding) {
3126 struct inet6_dev *idev = (struct inet6_dev *)table->extra1;
3127 int changed;
3128 if (unlikely(idev == NULL))
3129 return -ENODEV;
3130 changed = (!*valp) ^ (!new);
3131 *valp = new;
3132 if (changed)
3133 dev_forward_change(idev);
3134 } else {
3135 *valp = new;
3136 addrconf_forward_change();
3137 }
3138
3139 if (*valp)
3140 rt6_purge_dflt_routers();
3141 } else
3142 *valp = new;
3143
3144 return 1;
3145 }
3146
3147 static struct addrconf_sysctl_table
3148 {
3149 struct ctl_table_header *sysctl_header;
3150 ctl_table addrconf_vars[18];
3151 ctl_table addrconf_dev[2];
3152 ctl_table addrconf_conf_dir[2];
3153 ctl_table addrconf_proto_dir[2];
3154 ctl_table addrconf_root_dir[2];
3155 } addrconf_sysctl = {
3156 .sysctl_header = NULL,
3157 .addrconf_vars = {
3158 {
3159 .ctl_name = NET_IPV6_FORWARDING,
3160 .procname = "forwarding",
3161 .data = &ipv6_devconf.forwarding,
3162 .maxlen = sizeof(int),
3163 .mode = 0644,
3164 .proc_handler = &addrconf_sysctl_forward,
3165 .strategy = &addrconf_sysctl_forward_strategy,
3166 },
3167 {
3168 .ctl_name = NET_IPV6_HOP_LIMIT,
3169 .procname = "hop_limit",
3170 .data = &ipv6_devconf.hop_limit,
3171 .maxlen = sizeof(int),
3172 .mode = 0644,
3173 .proc_handler = proc_dointvec,
3174 },
3175 {
3176 .ctl_name = NET_IPV6_MTU,
3177 .procname = "mtu",
3178 .data = &ipv6_devconf.mtu6,
3179 .maxlen = sizeof(int),
3180 .mode = 0644,
3181 .proc_handler = &proc_dointvec,
3182 },
3183 {
3184 .ctl_name = NET_IPV6_ACCEPT_RA,
3185 .procname = "accept_ra",
3186 .data = &ipv6_devconf.accept_ra,
3187 .maxlen = sizeof(int),
3188 .mode = 0644,
3189 .proc_handler = &proc_dointvec,
3190 },
3191 {
3192 .ctl_name = NET_IPV6_ACCEPT_REDIRECTS,
3193 .procname = "accept_redirects",
3194 .data = &ipv6_devconf.accept_redirects,
3195 .maxlen = sizeof(int),
3196 .mode = 0644,
3197 .proc_handler = &proc_dointvec,
3198 },
3199 {
3200 .ctl_name = NET_IPV6_AUTOCONF,
3201 .procname = "autoconf",
3202 .data = &ipv6_devconf.autoconf,
3203 .maxlen = sizeof(int),
3204 .mode = 0644,
3205 .proc_handler = &proc_dointvec,
3206 },
3207 {
3208 .ctl_name = NET_IPV6_DAD_TRANSMITS,
3209 .procname = "dad_transmits",
3210 .data = &ipv6_devconf.dad_transmits,
3211 .maxlen = sizeof(int),
3212 .mode = 0644,
3213 .proc_handler = &proc_dointvec,
3214 },
3215 {
3216 .ctl_name = NET_IPV6_RTR_SOLICITS,
3217 .procname = "router_solicitations",
3218 .data = &ipv6_devconf.rtr_solicits,
3219 .maxlen = sizeof(int),
3220 .mode = 0644,
3221 .proc_handler = &proc_dointvec,
3222 },
3223 {
3224 .ctl_name = NET_IPV6_RTR_SOLICIT_INTERVAL,
3225 .procname = "router_solicitation_interval",
3226 .data = &ipv6_devconf.rtr_solicit_interval,
3227 .maxlen = sizeof(int),
3228 .mode = 0644,
3229 .proc_handler = &proc_dointvec_jiffies,
3230 .strategy = &sysctl_jiffies,
3231 },
3232 {
3233 .ctl_name = NET_IPV6_RTR_SOLICIT_DELAY,
3234 .procname = "router_solicitation_delay",
3235 .data = &ipv6_devconf.rtr_solicit_delay,
3236 .maxlen = sizeof(int),
3237 .mode = 0644,
3238 .proc_handler = &proc_dointvec_jiffies,
3239 .strategy = &sysctl_jiffies,
3240 },
3241 {
3242 .ctl_name = NET_IPV6_FORCE_MLD_VERSION,
3243 .procname = "force_mld_version",
3244 .data = &ipv6_devconf.force_mld_version,
3245 .maxlen = sizeof(int),
3246 .mode = 0644,
3247 .proc_handler = &proc_dointvec,
3248 },
3249 #ifdef CONFIG_IPV6_PRIVACY
3250 {
3251 .ctl_name = NET_IPV6_USE_TEMPADDR,
3252 .procname = "use_tempaddr",
3253 .data = &ipv6_devconf.use_tempaddr,
3254 .maxlen = sizeof(int),
3255 .mode = 0644,
3256 .proc_handler = &proc_dointvec,
3257 },
3258 {
3259 .ctl_name = NET_IPV6_TEMP_VALID_LFT,
3260 .procname = "temp_valid_lft",
3261 .data = &ipv6_devconf.temp_valid_lft,
3262 .maxlen = sizeof(int),
3263 .mode = 0644,
3264 .proc_handler = &proc_dointvec,
3265 },
3266 {
3267 .ctl_name = NET_IPV6_TEMP_PREFERED_LFT,
3268 .procname = "temp_prefered_lft",
3269 .data = &ipv6_devconf.temp_prefered_lft,
3270 .maxlen = sizeof(int),
3271 .mode = 0644,
3272 .proc_handler = &proc_dointvec,
3273 },
3274 {
3275 .ctl_name = NET_IPV6_REGEN_MAX_RETRY,
3276 .procname = "regen_max_retry",
3277 .data = &ipv6_devconf.regen_max_retry,
3278 .maxlen = sizeof(int),
3279 .mode = 0644,
3280 .proc_handler = &proc_dointvec,
3281 },
3282 {
3283 .ctl_name = NET_IPV6_MAX_DESYNC_FACTOR,
3284 .procname = "max_desync_factor",
3285 .data = &ipv6_devconf.max_desync_factor,
3286 .maxlen = sizeof(int),
3287 .mode = 0644,
3288 .proc_handler = &proc_dointvec,
3289 },
3290 #endif
3291 {
3292 .ctl_name = NET_IPV6_MAX_ADDRESSES,
3293 .procname = "max_addresses",
3294 .data = &ipv6_devconf.max_addresses,
3295 .maxlen = sizeof(int),
3296 .mode = 0644,
3297 .proc_handler = &proc_dointvec,
3298 },
3299 {
3300 .ctl_name = 0, /* sentinel */
3301 }
3302 },
3303 .addrconf_dev = {
3304 {
3305 .ctl_name = NET_PROTO_CONF_ALL,
3306 .procname = "all",
3307 .mode = 0555,
3308 .child = addrconf_sysctl.addrconf_vars,
3309 },
3310 {
3311 .ctl_name = 0, /* sentinel */
3312 }
3313 },
3314 .addrconf_conf_dir = {
3315 {
3316 .ctl_name = NET_IPV6_CONF,
3317 .procname = "conf",
3318 .mode = 0555,
3319 .child = addrconf_sysctl.addrconf_dev,
3320 },
3321 {
3322 .ctl_name = 0, /* sentinel */
3323 }
3324 },
3325 .addrconf_proto_dir = {
3326 {
3327 .ctl_name = NET_IPV6,
3328 .procname = "ipv6",
3329 .mode = 0555,
3330 .child = addrconf_sysctl.addrconf_conf_dir,
3331 },
3332 {
3333 .ctl_name = 0, /* sentinel */
3334 }
3335 },
3336 .addrconf_root_dir = {
3337 {
3338 .ctl_name = CTL_NET,
3339 .procname = "net",
3340 .mode = 0555,
3341 .child = addrconf_sysctl.addrconf_proto_dir,
3342 },
3343 {
3344 .ctl_name = 0, /* sentinel */
3345 }
3346 },
3347 };
3348
3349 static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p)
3350 {
3351 int i;
3352 struct net_device *dev = idev ? idev->dev : NULL;
3353 struct addrconf_sysctl_table *t;
3354 char *dev_name = NULL;
3355
3356 t = kmalloc(sizeof(*t), GFP_KERNEL);
3357 if (t == NULL)
3358 return;
3359 memcpy(t, &addrconf_sysctl, sizeof(*t));
3360 for (i=0; t->addrconf_vars[i].data; i++) {
3361 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
3362 t->addrconf_vars[i].de = NULL;
3363 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
3364 }
3365 if (dev) {
3366 dev_name = dev->name;
3367 t->addrconf_dev[0].ctl_name = dev->ifindex;
3368 } else {
3369 dev_name = "default";
3370 t->addrconf_dev[0].ctl_name = NET_PROTO_CONF_DEFAULT;
3371 }
3372
3373 /*
3374 * Make a copy of dev_name, because '.procname' is regarded as const
3375 * by sysctl and we wouldn't want anyone to change it under our feet
3376 * (see SIOCSIFNAME).
3377 */
3378 dev_name = net_sysctl_strdup(dev_name);
3379 if (!dev_name)
3380 goto free;
3381
3382 t->addrconf_dev[0].procname = dev_name;
3383
3384 t->addrconf_dev[0].child = t->addrconf_vars;
3385 t->addrconf_dev[0].de = NULL;
3386 t->addrconf_conf_dir[0].child = t->addrconf_dev;
3387 t->addrconf_conf_dir[0].de = NULL;
3388 t->addrconf_proto_dir[0].child = t->addrconf_conf_dir;
3389 t->addrconf_proto_dir[0].de = NULL;
3390 t->addrconf_root_dir[0].child = t->addrconf_proto_dir;
3391 t->addrconf_root_dir[0].de = NULL;
3392
3393 t->sysctl_header = register_sysctl_table(t->addrconf_root_dir, 0);
3394 if (t->sysctl_header == NULL)
3395 goto free_procname;
3396 else
3397 p->sysctl = t;
3398 return;
3399
3400 /* error path */
3401 free_procname:
3402 kfree(dev_name);
3403 free:
3404 kfree(t);
3405
3406 return;
3407 }
3408
3409 static void addrconf_sysctl_unregister(struct ipv6_devconf *p)
3410 {
3411 if (p->sysctl) {
3412 struct addrconf_sysctl_table *t = p->sysctl;
3413 p->sysctl = NULL;
3414 unregister_sysctl_table(t->sysctl_header);
3415 kfree(t->addrconf_dev[0].procname);
3416 kfree(t);
3417 }
3418 }
3419
3420
3421 #endif
3422
3423 /*
3424 * Device notifier
3425 */
3426
3427 int register_inet6addr_notifier(struct notifier_block *nb)
3428 {
3429 return notifier_chain_register(&inet6addr_chain, nb);
3430 }
3431
3432 int unregister_inet6addr_notifier(struct notifier_block *nb)
3433 {
3434 return notifier_chain_unregister(&inet6addr_chain,nb);
3435 }
3436
3437 /*
3438 * Init / cleanup code
3439 */
3440
3441 void __init addrconf_init(void)
3442 {
3443 /* The addrconf netdev notifier requires that loopback_dev
3444 * has it's ipv6 private information allocated and setup
3445 * before it can bring up and give link-local addresses
3446 * to other devices which are up.
3447 *
3448 * Unfortunately, loopback_dev is not necessarily the first
3449 * entry in the global dev_base list of net devices. In fact,
3450 * it is likely to be the very last entry on that list.
3451 * So this causes the notifier registry below to try and
3452 * give link-local addresses to all devices besides loopback_dev
3453 * first, then loopback_dev, which cases all the non-loopback_dev
3454 * devices to fail to get a link-local address.
3455 *
3456 * So, as a temporary fix, register loopback_dev first by hand.
3457 * Longer term, all of the dependencies ipv6 has upon the loopback
3458 * device and it being up should be removed.
3459 */
3460 rtnl_lock();
3461 addrconf_notify(&ipv6_dev_notf, NETDEV_REGISTER, &loopback_dev);
3462 if (loopback_dev.flags & IFF_UP)
3463 addrconf_notify(&ipv6_dev_notf, NETDEV_UP, &loopback_dev);
3464 rtnl_unlock();
3465
3466 register_netdevice_notifier(&ipv6_dev_notf);
3467
3468 #ifdef CONFIG_IPV6_PRIVACY
3469 md5_tfm = crypto_alloc_tfm("md5", 0);
3470 if (unlikely(md5_tfm == NULL))
3471 printk(KERN_WARNING
3472 "failed to load transform for md5\n");
3473 #endif
3474
3475 addrconf_verify(0);
3476 rtnetlink_links[PF_INET6] = inet6_rtnetlink_table;
3477 #ifdef CONFIG_SYSCTL
3478 addrconf_sysctl.sysctl_header =
3479 register_sysctl_table(addrconf_sysctl.addrconf_root_dir, 0);
3480 addrconf_sysctl_register(NULL, &ipv6_devconf_dflt);
3481 #endif
3482 }
3483
3484 void __exit addrconf_cleanup(void)
3485 {
3486 struct net_device *dev;
3487 struct inet6_dev *idev;
3488 struct inet6_ifaddr *ifa;
3489 int i;
3490
3491 unregister_netdevice_notifier(&ipv6_dev_notf);
3492
3493 rtnetlink_links[PF_INET6] = NULL;
3494 #ifdef CONFIG_SYSCTL
3495 addrconf_sysctl_unregister(&ipv6_devconf_dflt);
3496 addrconf_sysctl_unregister(&ipv6_devconf);
3497 #endif
3498
3499 rtnl_lock();
3500
3501 /*
3502 * clean dev list.
3503 */
3504
3505 for (dev=dev_base; dev; dev=dev->next) {
3506 if ((idev = __in6_dev_get(dev)) == NULL)
3507 continue;
3508 addrconf_ifdown(dev, 1);
3509 }
3510
3511 /*
3512 * Check hash table.
3513 */
3514
3515 write_lock_bh(&addrconf_hash_lock);
3516 for (i=0; i < IN6_ADDR_HSIZE; i++) {
3517 for (ifa=inet6_addr_lst[i]; ifa; ) {
3518 struct inet6_ifaddr *bifa;
3519
3520 bifa = ifa;
3521 ifa = ifa->lst_next;
3522 printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
3523 /* Do not free it; something is wrong.
3524 Now we can investigate it with debugger.
3525 */
3526 }
3527 }
3528 write_unlock_bh(&addrconf_hash_lock);
3529
3530 del_timer(&addr_chk_timer);
3531
3532 rtnl_unlock();
3533
3534 #ifdef CONFIG_IPV6_PRIVACY
3535 if (likely(md5_tfm != NULL)) {
3536 crypto_free_tfm(md5_tfm);
3537 md5_tfm = NULL;
3538 }
3539 #endif
3540
3541 #ifdef CONFIG_PROC_FS
3542 proc_net_remove("if_inet6");
3543 #endif
3544 }
3545
|
This page was automatically generated by the
LXR engine.
|