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[mirror_ubuntu-bionic-kernel.git] / net / ipv6 / addrconf.c
1 /*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
9 * $Id: addrconf.c,v 1.69 2001/10/31 21:55:54 davem Exp $
10 *
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License
13 * as published by the Free Software Foundation; either version
14 * 2 of the License, or (at your option) any later version.
15 */
16
17 /*
18 * Changes:
19 *
20 * Janos Farkas : delete timer on ifdown
21 * <chexum@bankinf.banki.hu>
22 * Andi Kleen : kill double kfree on module
23 * unload.
24 * Maciej W. Rozycki : FDDI support
25 * sekiya@USAGI : Don't send too many RS
26 * packets.
27 * yoshfuji@USAGI : Fixed interval between DAD
28 * packets.
29 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
30 * address validation timer.
31 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
32 * support.
33 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
34 * address on a same interface.
35 * YOSHIFUJI Hideaki @USAGI : ARCnet support
36 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
37 * seq_file.
38 * YOSHIFUJI Hideaki @USAGI : improved source address
39 * selection; consider scope,
40 * status etc.
41 */
42
43 #include <linux/config.h>
44 #include <linux/errno.h>
45 #include <linux/types.h>
46 #include <linux/socket.h>
47 #include <linux/sockios.h>
48 #include <linux/sched.h>
49 #include <linux/net.h>
50 #include <linux/in6.h>
51 #include <linux/netdevice.h>
52 #include <linux/if_arp.h>
53 #include <linux/if_arcnet.h>
54 #include <linux/if_infiniband.h>
55 #include <linux/route.h>
56 #include <linux/inetdevice.h>
57 #include <linux/init.h>
58 #ifdef CONFIG_SYSCTL
59 #include <linux/sysctl.h>
60 #endif
61 #include <linux/delay.h>
62 #include <linux/notifier.h>
63 #include <linux/string.h>
64
65 #include <net/sock.h>
66 #include <net/snmp.h>
67
68 #include <net/ipv6.h>
69 #include <net/protocol.h>
70 #include <net/ndisc.h>
71 #include <net/ip6_route.h>
72 #include <net/addrconf.h>
73 #include <net/tcp.h>
74 #include <net/ip.h>
75 #include <linux/if_tunnel.h>
76 #include <linux/rtnetlink.h>
77
78 #ifdef CONFIG_IPV6_PRIVACY
79 #include <linux/random.h>
80 #include <linux/crypto.h>
81 #include <linux/scatterlist.h>
82 #endif
83
84 #include <asm/uaccess.h>
85
86 #include <linux/proc_fs.h>
87 #include <linux/seq_file.h>
88
89 /* Set to 3 to get tracing... */
90 #define ACONF_DEBUG 2
91
92 #if ACONF_DEBUG >= 3
93 #define ADBG(x) printk x
94 #else
95 #define ADBG(x)
96 #endif
97
98 #define INFINITY_LIFE_TIME 0xFFFFFFFF
99 #define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b)))
100
101 #ifdef CONFIG_SYSCTL
102 static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p);
103 static void addrconf_sysctl_unregister(struct ipv6_devconf *p);
104 #endif
105
106 #ifdef CONFIG_IPV6_PRIVACY
107 static int __ipv6_regen_rndid(struct inet6_dev *idev);
108 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
109 static void ipv6_regen_rndid(unsigned long data);
110
111 static int desync_factor = MAX_DESYNC_FACTOR * HZ;
112 static struct crypto_tfm *md5_tfm;
113 static DEFINE_SPINLOCK(md5_tfm_lock);
114 #endif
115
116 static int ipv6_count_addresses(struct inet6_dev *idev);
117
118 /*
119 * Configured unicast address hash table
120 */
121 static struct inet6_ifaddr *inet6_addr_lst[IN6_ADDR_HSIZE];
122 static DEFINE_RWLOCK(addrconf_hash_lock);
123
124 /* Protects inet6 devices */
125 DEFINE_RWLOCK(addrconf_lock);
126
127 static void addrconf_verify(unsigned long);
128
129 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
130 static DEFINE_SPINLOCK(addrconf_verify_lock);
131
132 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
133 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
134
135 static int addrconf_ifdown(struct net_device *dev, int how);
136
137 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
138 static void addrconf_dad_timer(unsigned long data);
139 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
140 static void addrconf_rs_timer(unsigned long data);
141 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
142 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
143
144 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
145 struct prefix_info *pinfo);
146 static int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev);
147
148 static struct notifier_block *inet6addr_chain;
149
150 struct ipv6_devconf ipv6_devconf = {
151 .forwarding = 0,
152 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
153 .mtu6 = IPV6_MIN_MTU,
154 .accept_ra = 1,
155 .accept_redirects = 1,
156 .autoconf = 1,
157 .force_mld_version = 0,
158 .dad_transmits = 1,
159 .rtr_solicits = MAX_RTR_SOLICITATIONS,
160 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
161 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
162 #ifdef CONFIG_IPV6_PRIVACY
163 .use_tempaddr = 0,
164 .temp_valid_lft = TEMP_VALID_LIFETIME,
165 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
166 .regen_max_retry = REGEN_MAX_RETRY,
167 .max_desync_factor = MAX_DESYNC_FACTOR,
168 #endif
169 .max_addresses = IPV6_MAX_ADDRESSES,
170 };
171
172 static struct ipv6_devconf ipv6_devconf_dflt = {
173 .forwarding = 0,
174 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
175 .mtu6 = IPV6_MIN_MTU,
176 .accept_ra = 1,
177 .accept_redirects = 1,
178 .autoconf = 1,
179 .dad_transmits = 1,
180 .rtr_solicits = MAX_RTR_SOLICITATIONS,
181 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
182 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
183 #ifdef CONFIG_IPV6_PRIVACY
184 .use_tempaddr = 0,
185 .temp_valid_lft = TEMP_VALID_LIFETIME,
186 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
187 .regen_max_retry = REGEN_MAX_RETRY,
188 .max_desync_factor = MAX_DESYNC_FACTOR,
189 #endif
190 .max_addresses = IPV6_MAX_ADDRESSES,
191 };
192
193 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
194 #if 0
195 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
196 #endif
197 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
198
199 #define IPV6_ADDR_SCOPE_TYPE(scope) ((scope) << 16)
200
201 static inline unsigned ipv6_addr_scope2type(unsigned scope)
202 {
203 switch(scope) {
204 case IPV6_ADDR_SCOPE_NODELOCAL:
205 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_NODELOCAL) |
206 IPV6_ADDR_LOOPBACK);
207 case IPV6_ADDR_SCOPE_LINKLOCAL:
208 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL) |
209 IPV6_ADDR_LINKLOCAL);
210 case IPV6_ADDR_SCOPE_SITELOCAL:
211 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_SITELOCAL) |
212 IPV6_ADDR_SITELOCAL);
213 }
214 return IPV6_ADDR_SCOPE_TYPE(scope);
215 }
216
217 int __ipv6_addr_type(const struct in6_addr *addr)
218 {
219 u32 st;
220
221 st = addr->s6_addr32[0];
222
223 /* Consider all addresses with the first three bits different of
224 000 and 111 as unicasts.
225 */
226 if ((st & htonl(0xE0000000)) != htonl(0x00000000) &&
227 (st & htonl(0xE0000000)) != htonl(0xE0000000))
228 return (IPV6_ADDR_UNICAST |
229 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));
230
231 if ((st & htonl(0xFF000000)) == htonl(0xFF000000)) {
232 /* multicast */
233 /* addr-select 3.1 */
234 return (IPV6_ADDR_MULTICAST |
235 ipv6_addr_scope2type(IPV6_ADDR_MC_SCOPE(addr)));
236 }
237
238 if ((st & htonl(0xFFC00000)) == htonl(0xFE800000))
239 return (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_UNICAST |
240 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL)); /* addr-select 3.1 */
241 if ((st & htonl(0xFFC00000)) == htonl(0xFEC00000))
242 return (IPV6_ADDR_SITELOCAL | IPV6_ADDR_UNICAST |
243 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_SITELOCAL)); /* addr-select 3.1 */
244
245 if ((addr->s6_addr32[0] | addr->s6_addr32[1]) == 0) {
246 if (addr->s6_addr32[2] == 0) {
247 if (addr->s6_addr32[3] == 0)
248 return IPV6_ADDR_ANY;
249
250 if (addr->s6_addr32[3] == htonl(0x00000001))
251 return (IPV6_ADDR_LOOPBACK | IPV6_ADDR_UNICAST |
252 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL)); /* addr-select 3.4 */
253
254 return (IPV6_ADDR_COMPATv4 | IPV6_ADDR_UNICAST |
255 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* addr-select 3.3 */
256 }
257
258 if (addr->s6_addr32[2] == htonl(0x0000ffff))
259 return (IPV6_ADDR_MAPPED |
260 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* addr-select 3.3 */
261 }
262
263 return (IPV6_ADDR_RESERVED |
264 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* addr-select 3.4 */
265 }
266
267 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
268 {
269 if (del_timer(&ifp->timer))
270 __in6_ifa_put(ifp);
271 }
272
273 enum addrconf_timer_t
274 {
275 AC_NONE,
276 AC_DAD,
277 AC_RS,
278 };
279
280 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
281 enum addrconf_timer_t what,
282 unsigned long when)
283 {
284 if (!del_timer(&ifp->timer))
285 in6_ifa_hold(ifp);
286
287 switch (what) {
288 case AC_DAD:
289 ifp->timer.function = addrconf_dad_timer;
290 break;
291 case AC_RS:
292 ifp->timer.function = addrconf_rs_timer;
293 break;
294 default:;
295 }
296 ifp->timer.expires = jiffies + when;
297 add_timer(&ifp->timer);
298 }
299
300 /* Nobody refers to this device, we may destroy it. */
301
302 void in6_dev_finish_destroy(struct inet6_dev *idev)
303 {
304 struct net_device *dev = idev->dev;
305 BUG_TRAP(idev->addr_list==NULL);
306 BUG_TRAP(idev->mc_list==NULL);
307 #ifdef NET_REFCNT_DEBUG
308 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
309 #endif
310 dev_put(dev);
311 if (!idev->dead) {
312 printk("Freeing alive inet6 device %p\n", idev);
313 return;
314 }
315 snmp6_free_dev(idev);
316 kfree(idev);
317 }
318
319 static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
320 {
321 struct inet6_dev *ndev;
322
323 ASSERT_RTNL();
324
325 if (dev->mtu < IPV6_MIN_MTU)
326 return NULL;
327
328 ndev = kmalloc(sizeof(struct inet6_dev), GFP_KERNEL);
329
330 if (ndev) {
331 memset(ndev, 0, sizeof(struct inet6_dev));
332
333 rwlock_init(&ndev->lock);
334 ndev->dev = dev;
335 memcpy(&ndev->cnf, &ipv6_devconf_dflt, sizeof(ndev->cnf));
336 ndev->cnf.mtu6 = dev->mtu;
337 ndev->cnf.sysctl = NULL;
338 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
339 if (ndev->nd_parms == NULL) {
340 kfree(ndev);
341 return NULL;
342 }
343 /* We refer to the device */
344 dev_hold(dev);
345
346 if (snmp6_alloc_dev(ndev) < 0) {
347 ADBG((KERN_WARNING
348 "%s(): cannot allocate memory for statistics; dev=%s.\n",
349 __FUNCTION__, dev->name));
350 neigh_parms_release(&nd_tbl, ndev->nd_parms);
351 ndev->dead = 1;
352 in6_dev_finish_destroy(ndev);
353 return NULL;
354 }
355
356 if (snmp6_register_dev(ndev) < 0) {
357 ADBG((KERN_WARNING
358 "%s(): cannot create /proc/net/dev_snmp6/%s\n",
359 __FUNCTION__, dev->name));
360 neigh_parms_release(&nd_tbl, ndev->nd_parms);
361 ndev->dead = 1;
362 in6_dev_finish_destroy(ndev);
363 return NULL;
364 }
365
366 /* One reference from device. We must do this before
367 * we invoke __ipv6_regen_rndid().
368 */
369 in6_dev_hold(ndev);
370
371 #ifdef CONFIG_IPV6_PRIVACY
372 get_random_bytes(ndev->rndid, sizeof(ndev->rndid));
373 get_random_bytes(ndev->entropy, sizeof(ndev->entropy));
374 init_timer(&ndev->regen_timer);
375 ndev->regen_timer.function = ipv6_regen_rndid;
376 ndev->regen_timer.data = (unsigned long) ndev;
377 if ((dev->flags&IFF_LOOPBACK) ||
378 dev->type == ARPHRD_TUNNEL ||
379 dev->type == ARPHRD_NONE ||
380 dev->type == ARPHRD_SIT) {
381 printk(KERN_INFO
382 "Disabled Privacy Extensions on device %p(%s)\n",
383 dev, dev->name);
384 ndev->cnf.use_tempaddr = -1;
385 } else {
386 in6_dev_hold(ndev);
387 ipv6_regen_rndid((unsigned long) ndev);
388 }
389 #endif
390
391 write_lock_bh(&addrconf_lock);
392 dev->ip6_ptr = ndev;
393 write_unlock_bh(&addrconf_lock);
394
395 ipv6_mc_init_dev(ndev);
396 ndev->tstamp = jiffies;
397 #ifdef CONFIG_SYSCTL
398 neigh_sysctl_register(dev, ndev->nd_parms, NET_IPV6,
399 NET_IPV6_NEIGH, "ipv6",
400 &ndisc_ifinfo_sysctl_change,
401 NULL);
402 addrconf_sysctl_register(ndev, &ndev->cnf);
403 #endif
404 }
405 return ndev;
406 }
407
408 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
409 {
410 struct inet6_dev *idev;
411
412 ASSERT_RTNL();
413
414 if ((idev = __in6_dev_get(dev)) == NULL) {
415 if ((idev = ipv6_add_dev(dev)) == NULL)
416 return NULL;
417 }
418 if (dev->flags&IFF_UP)
419 ipv6_mc_up(idev);
420 return idev;
421 }
422
423 #ifdef CONFIG_SYSCTL
424 static void dev_forward_change(struct inet6_dev *idev)
425 {
426 struct net_device *dev;
427 struct inet6_ifaddr *ifa;
428 struct in6_addr addr;
429
430 if (!idev)
431 return;
432 dev = idev->dev;
433 if (dev && (dev->flags & IFF_MULTICAST)) {
434 ipv6_addr_all_routers(&addr);
435
436 if (idev->cnf.forwarding)
437 ipv6_dev_mc_inc(dev, &addr);
438 else
439 ipv6_dev_mc_dec(dev, &addr);
440 }
441 for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
442 if (idev->cnf.forwarding)
443 addrconf_join_anycast(ifa);
444 else
445 addrconf_leave_anycast(ifa);
446 }
447 }
448
449
450 static void addrconf_forward_change(void)
451 {
452 struct net_device *dev;
453 struct inet6_dev *idev;
454
455 read_lock(&dev_base_lock);
456 for (dev=dev_base; dev; dev=dev->next) {
457 read_lock(&addrconf_lock);
458 idev = __in6_dev_get(dev);
459 if (idev) {
460 int changed = (!idev->cnf.forwarding) ^ (!ipv6_devconf.forwarding);
461 idev->cnf.forwarding = ipv6_devconf.forwarding;
462 if (changed)
463 dev_forward_change(idev);
464 }
465 read_unlock(&addrconf_lock);
466 }
467 read_unlock(&dev_base_lock);
468 }
469 #endif
470
471 /* Nobody refers to this ifaddr, destroy it */
472
473 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
474 {
475 BUG_TRAP(ifp->if_next==NULL);
476 BUG_TRAP(ifp->lst_next==NULL);
477 #ifdef NET_REFCNT_DEBUG
478 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
479 #endif
480
481 in6_dev_put(ifp->idev);
482
483 if (del_timer(&ifp->timer))
484 printk("Timer is still running, when freeing ifa=%p\n", ifp);
485
486 if (!ifp->dead) {
487 printk("Freeing alive inet6 address %p\n", ifp);
488 return;
489 }
490 dst_release(&ifp->rt->u.dst);
491
492 kfree(ifp);
493 }
494
495 /* On success it returns ifp with increased reference count */
496
497 static struct inet6_ifaddr *
498 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
499 int scope, u32 flags)
500 {
501 struct inet6_ifaddr *ifa = NULL;
502 struct rt6_info *rt;
503 int hash;
504 int err = 0;
505
506 read_lock_bh(&addrconf_lock);
507 if (idev->dead) {
508 err = -ENODEV; /*XXX*/
509 goto out2;
510 }
511
512 write_lock(&addrconf_hash_lock);
513
514 /* Ignore adding duplicate addresses on an interface */
515 if (ipv6_chk_same_addr(addr, idev->dev)) {
516 ADBG(("ipv6_add_addr: already assigned\n"));
517 err = -EEXIST;
518 goto out;
519 }
520
521 ifa = kmalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
522
523 if (ifa == NULL) {
524 ADBG(("ipv6_add_addr: malloc failed\n"));
525 err = -ENOBUFS;
526 goto out;
527 }
528
529 rt = addrconf_dst_alloc(idev, addr, 0);
530 if (IS_ERR(rt)) {
531 err = PTR_ERR(rt);
532 goto out;
533 }
534
535 memset(ifa, 0, sizeof(struct inet6_ifaddr));
536 ipv6_addr_copy(&ifa->addr, addr);
537
538 spin_lock_init(&ifa->lock);
539 init_timer(&ifa->timer);
540 ifa->timer.data = (unsigned long) ifa;
541 ifa->scope = scope;
542 ifa->prefix_len = pfxlen;
543 ifa->flags = flags | IFA_F_TENTATIVE;
544 ifa->cstamp = ifa->tstamp = jiffies;
545
546 ifa->idev = idev;
547 in6_dev_hold(idev);
548 /* For caller */
549 in6_ifa_hold(ifa);
550
551 /* Add to big hash table */
552 hash = ipv6_addr_hash(addr);
553
554 ifa->lst_next = inet6_addr_lst[hash];
555 inet6_addr_lst[hash] = ifa;
556 in6_ifa_hold(ifa);
557 write_unlock(&addrconf_hash_lock);
558
559 write_lock(&idev->lock);
560 /* Add to inet6_dev unicast addr list. */
561 ifa->if_next = idev->addr_list;
562 idev->addr_list = ifa;
563
564 #ifdef CONFIG_IPV6_PRIVACY
565 if (ifa->flags&IFA_F_TEMPORARY) {
566 ifa->tmp_next = idev->tempaddr_list;
567 idev->tempaddr_list = ifa;
568 in6_ifa_hold(ifa);
569 }
570 #endif
571
572 ifa->rt = rt;
573
574 in6_ifa_hold(ifa);
575 write_unlock(&idev->lock);
576 out2:
577 read_unlock_bh(&addrconf_lock);
578
579 if (likely(err == 0))
580 notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
581 else {
582 kfree(ifa);
583 ifa = ERR_PTR(err);
584 }
585
586 return ifa;
587 out:
588 write_unlock(&addrconf_hash_lock);
589 goto out2;
590 }
591
592 /* This function wants to get referenced ifp and releases it before return */
593
594 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
595 {
596 struct inet6_ifaddr *ifa, **ifap;
597 struct inet6_dev *idev = ifp->idev;
598 int hash;
599 int deleted = 0, onlink = 0;
600 unsigned long expires = jiffies;
601
602 hash = ipv6_addr_hash(&ifp->addr);
603
604 ifp->dead = 1;
605
606 write_lock_bh(&addrconf_hash_lock);
607 for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
608 ifap = &ifa->lst_next) {
609 if (ifa == ifp) {
610 *ifap = ifa->lst_next;
611 __in6_ifa_put(ifp);
612 ifa->lst_next = NULL;
613 break;
614 }
615 }
616 write_unlock_bh(&addrconf_hash_lock);
617
618 write_lock_bh(&idev->lock);
619 #ifdef CONFIG_IPV6_PRIVACY
620 if (ifp->flags&IFA_F_TEMPORARY) {
621 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
622 ifap = &ifa->tmp_next) {
623 if (ifa == ifp) {
624 *ifap = ifa->tmp_next;
625 if (ifp->ifpub) {
626 in6_ifa_put(ifp->ifpub);
627 ifp->ifpub = NULL;
628 }
629 __in6_ifa_put(ifp);
630 ifa->tmp_next = NULL;
631 break;
632 }
633 }
634 }
635 #endif
636
637 for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;
638 ifap = &ifa->if_next) {
639 if (ifa == ifp) {
640 *ifap = ifa->if_next;
641 __in6_ifa_put(ifp);
642 ifa->if_next = NULL;
643 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
644 break;
645 deleted = 1;
646 } else if (ifp->flags & IFA_F_PERMANENT) {
647 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
648 ifp->prefix_len)) {
649 if (ifa->flags & IFA_F_PERMANENT) {
650 onlink = 1;
651 if (deleted)
652 break;
653 } else {
654 unsigned long lifetime;
655
656 if (!onlink)
657 onlink = -1;
658
659 spin_lock(&ifa->lock);
660 lifetime = min_t(unsigned long,
661 ifa->valid_lft, 0x7fffffffUL/HZ);
662 if (time_before(expires,
663 ifa->tstamp + lifetime * HZ))
664 expires = ifa->tstamp + lifetime * HZ;
665 spin_unlock(&ifa->lock);
666 }
667 }
668 }
669 }
670 write_unlock_bh(&idev->lock);
671
672 ipv6_ifa_notify(RTM_DELADDR, ifp);
673
674 notifier_call_chain(&inet6addr_chain,NETDEV_DOWN,ifp);
675
676 addrconf_del_timer(ifp);
677
678 /*
679 * Purge or update corresponding prefix
680 *
681 * 1) we don't purge prefix here if address was not permanent.
682 * prefix is managed by its own lifetime.
683 * 2) if there're no addresses, delete prefix.
684 * 3) if there're still other permanent address(es),
685 * corresponding prefix is still permanent.
686 * 4) otherwise, update prefix lifetime to the
687 * longest valid lifetime among the corresponding
688 * addresses on the device.
689 * Note: subsequent RA will update lifetime.
690 *
691 * --yoshfuji
692 */
693 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
694 struct in6_addr prefix;
695 struct rt6_info *rt;
696
697 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
698 rt = rt6_lookup(&prefix, NULL, ifp->idev->dev->ifindex, 1);
699
700 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
701 if (onlink == 0) {
702 ip6_del_rt(rt, NULL, NULL, NULL);
703 rt = NULL;
704 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
705 rt->rt6i_expires = expires;
706 rt->rt6i_flags |= RTF_EXPIRES;
707 }
708 }
709 dst_release(&rt->u.dst);
710 }
711
712 in6_ifa_put(ifp);
713 }
714
715 #ifdef CONFIG_IPV6_PRIVACY
716 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
717 {
718 struct inet6_dev *idev = ifp->idev;
719 struct in6_addr addr, *tmpaddr;
720 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
721 int tmp_plen;
722 int ret = 0;
723 int max_addresses;
724
725 write_lock(&idev->lock);
726 if (ift) {
727 spin_lock_bh(&ift->lock);
728 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
729 spin_unlock_bh(&ift->lock);
730 tmpaddr = &addr;
731 } else {
732 tmpaddr = NULL;
733 }
734 retry:
735 in6_dev_hold(idev);
736 if (idev->cnf.use_tempaddr <= 0) {
737 write_unlock(&idev->lock);
738 printk(KERN_INFO
739 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
740 in6_dev_put(idev);
741 ret = -1;
742 goto out;
743 }
744 spin_lock_bh(&ifp->lock);
745 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
746 idev->cnf.use_tempaddr = -1; /*XXX*/
747 spin_unlock_bh(&ifp->lock);
748 write_unlock(&idev->lock);
749 printk(KERN_WARNING
750 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
751 in6_dev_put(idev);
752 ret = -1;
753 goto out;
754 }
755 in6_ifa_hold(ifp);
756 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
757 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
758 spin_unlock_bh(&ifp->lock);
759 write_unlock(&idev->lock);
760 printk(KERN_WARNING
761 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
762 in6_ifa_put(ifp);
763 in6_dev_put(idev);
764 ret = -1;
765 goto out;
766 }
767 memcpy(&addr.s6_addr[8], idev->rndid, 8);
768 tmp_valid_lft = min_t(__u32,
769 ifp->valid_lft,
770 idev->cnf.temp_valid_lft);
771 tmp_prefered_lft = min_t(__u32,
772 ifp->prefered_lft,
773 idev->cnf.temp_prefered_lft - desync_factor / HZ);
774 tmp_plen = ifp->prefix_len;
775 max_addresses = idev->cnf.max_addresses;
776 tmp_cstamp = ifp->cstamp;
777 tmp_tstamp = ifp->tstamp;
778 spin_unlock_bh(&ifp->lock);
779
780 write_unlock(&idev->lock);
781 ift = !max_addresses ||
782 ipv6_count_addresses(idev) < max_addresses ?
783 ipv6_add_addr(idev, &addr, tmp_plen,
784 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK, IFA_F_TEMPORARY) : NULL;
785 if (!ift || IS_ERR(ift)) {
786 in6_ifa_put(ifp);
787 in6_dev_put(idev);
788 printk(KERN_INFO
789 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
790 tmpaddr = &addr;
791 write_lock(&idev->lock);
792 goto retry;
793 }
794
795 spin_lock_bh(&ift->lock);
796 ift->ifpub = ifp;
797 ift->valid_lft = tmp_valid_lft;
798 ift->prefered_lft = tmp_prefered_lft;
799 ift->cstamp = tmp_cstamp;
800 ift->tstamp = tmp_tstamp;
801 spin_unlock_bh(&ift->lock);
802
803 addrconf_dad_start(ift, 0);
804 in6_ifa_put(ift);
805 in6_dev_put(idev);
806 out:
807 return ret;
808 }
809 #endif
810
811 /*
812 * Choose an appropriate source address
813 * should do:
814 * i) get an address with an appropriate scope
815 * ii) see if there is a specific route for the destination and use
816 * an address of the attached interface
817 * iii) don't use deprecated addresses
818 */
819 static int inline ipv6_saddr_pref(const struct inet6_ifaddr *ifp, u8 invpref)
820 {
821 int pref;
822 pref = ifp->flags&IFA_F_DEPRECATED ? 0 : 2;
823 #ifdef CONFIG_IPV6_PRIVACY
824 pref |= (ifp->flags^invpref)&IFA_F_TEMPORARY ? 0 : 1;
825 #endif
826 return pref;
827 }
828
829 #ifdef CONFIG_IPV6_PRIVACY
830 #define IPV6_GET_SADDR_MAXSCORE(score) ((score) == 3)
831 #else
832 #define IPV6_GET_SADDR_MAXSCORE(score) (score)
833 #endif
834
835 int ipv6_dev_get_saddr(struct net_device *dev,
836 struct in6_addr *daddr, struct in6_addr *saddr)
837 {
838 struct inet6_ifaddr *ifp = NULL;
839 struct inet6_ifaddr *match = NULL;
840 struct inet6_dev *idev;
841 int scope;
842 int err;
843 int hiscore = -1, score;
844
845 scope = ipv6_addr_scope(daddr);
846
847 /*
848 * known dev
849 * search dev and walk through dev addresses
850 */
851
852 if (dev) {
853 if (dev->flags & IFF_LOOPBACK)
854 scope = IFA_HOST;
855
856 read_lock(&addrconf_lock);
857 idev = __in6_dev_get(dev);
858 if (idev) {
859 read_lock_bh(&idev->lock);
860 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
861 if (ifp->scope == scope) {
862 if (ifp->flags&IFA_F_TENTATIVE)
863 continue;
864 #ifdef CONFIG_IPV6_PRIVACY
865 score = ipv6_saddr_pref(ifp, idev->cnf.use_tempaddr > 1 ? IFA_F_TEMPORARY : 0);
866 #else
867 score = ipv6_saddr_pref(ifp, 0);
868 #endif
869 if (score <= hiscore)
870 continue;
871
872 if (match)
873 in6_ifa_put(match);
874 match = ifp;
875 hiscore = score;
876 in6_ifa_hold(ifp);
877
878 if (IPV6_GET_SADDR_MAXSCORE(score)) {
879 read_unlock_bh(&idev->lock);
880 read_unlock(&addrconf_lock);
881 goto out;
882 }
883 }
884 }
885 read_unlock_bh(&idev->lock);
886 }
887 read_unlock(&addrconf_lock);
888 }
889
890 if (scope == IFA_LINK)
891 goto out;
892
893 /*
894 * dev == NULL or search failed for specified dev
895 */
896
897 read_lock(&dev_base_lock);
898 read_lock(&addrconf_lock);
899 for (dev = dev_base; dev; dev=dev->next) {
900 idev = __in6_dev_get(dev);
901 if (idev) {
902 read_lock_bh(&idev->lock);
903 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
904 if (ifp->scope == scope) {
905 if (ifp->flags&IFA_F_TENTATIVE)
906 continue;
907 #ifdef CONFIG_IPV6_PRIVACY
908 score = ipv6_saddr_pref(ifp, idev->cnf.use_tempaddr > 1 ? IFA_F_TEMPORARY : 0);
909 #else
910 score = ipv6_saddr_pref(ifp, 0);
911 #endif
912 if (score <= hiscore)
913 continue;
914
915 if (match)
916 in6_ifa_put(match);
917 match = ifp;
918 hiscore = score;
919 in6_ifa_hold(ifp);
920
921 if (IPV6_GET_SADDR_MAXSCORE(score)) {
922 read_unlock_bh(&idev->lock);
923 goto out_unlock_base;
924 }
925 }
926 }
927 read_unlock_bh(&idev->lock);
928 }
929 }
930
931 out_unlock_base:
932 read_unlock(&addrconf_lock);
933 read_unlock(&dev_base_lock);
934
935 out:
936 err = -EADDRNOTAVAIL;
937 if (match) {
938 ipv6_addr_copy(saddr, &match->addr);
939 err = 0;
940 in6_ifa_put(match);
941 }
942
943 return err;
944 }
945
946
947 int ipv6_get_saddr(struct dst_entry *dst,
948 struct in6_addr *daddr, struct in6_addr *saddr)
949 {
950 return ipv6_dev_get_saddr(dst ? ((struct rt6_info *)dst)->rt6i_idev->dev : NULL, daddr, saddr);
951 }
952
953
954 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr)
955 {
956 struct inet6_dev *idev;
957 int err = -EADDRNOTAVAIL;
958
959 read_lock(&addrconf_lock);
960 if ((idev = __in6_dev_get(dev)) != NULL) {
961 struct inet6_ifaddr *ifp;
962
963 read_lock_bh(&idev->lock);
964 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
965 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
966 ipv6_addr_copy(addr, &ifp->addr);
967 err = 0;
968 break;
969 }
970 }
971 read_unlock_bh(&idev->lock);
972 }
973 read_unlock(&addrconf_lock);
974 return err;
975 }
976
977 static int ipv6_count_addresses(struct inet6_dev *idev)
978 {
979 int cnt = 0;
980 struct inet6_ifaddr *ifp;
981
982 read_lock_bh(&idev->lock);
983 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
984 cnt++;
985 read_unlock_bh(&idev->lock);
986 return cnt;
987 }
988
989 int ipv6_chk_addr(struct in6_addr *addr, struct net_device *dev, int strict)
990 {
991 struct inet6_ifaddr * ifp;
992 u8 hash = ipv6_addr_hash(addr);
993
994 read_lock_bh(&addrconf_hash_lock);
995 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
996 if (ipv6_addr_equal(&ifp->addr, addr) &&
997 !(ifp->flags&IFA_F_TENTATIVE)) {
998 if (dev == NULL || ifp->idev->dev == dev ||
999 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1000 break;
1001 }
1002 }
1003 read_unlock_bh(&addrconf_hash_lock);
1004 return ifp != NULL;
1005 }
1006
1007 static
1008 int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev)
1009 {
1010 struct inet6_ifaddr * ifp;
1011 u8 hash = ipv6_addr_hash(addr);
1012
1013 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1014 if (ipv6_addr_equal(&ifp->addr, addr)) {
1015 if (dev == NULL || ifp->idev->dev == dev)
1016 break;
1017 }
1018 }
1019 return ifp != NULL;
1020 }
1021
1022 struct inet6_ifaddr * ipv6_get_ifaddr(struct in6_addr *addr, struct net_device *dev, int strict)
1023 {
1024 struct inet6_ifaddr * ifp;
1025 u8 hash = ipv6_addr_hash(addr);
1026
1027 read_lock_bh(&addrconf_hash_lock);
1028 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1029 if (ipv6_addr_equal(&ifp->addr, addr)) {
1030 if (dev == NULL || ifp->idev->dev == dev ||
1031 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1032 in6_ifa_hold(ifp);
1033 break;
1034 }
1035 }
1036 }
1037 read_unlock_bh(&addrconf_hash_lock);
1038
1039 return ifp;
1040 }
1041
1042 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1043 {
1044 const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
1045 const struct in6_addr *sk2_rcv_saddr6 = tcp_v6_rcv_saddr(sk2);
1046 u32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
1047 u32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1048 int sk_ipv6only = ipv6_only_sock(sk);
1049 int sk2_ipv6only = inet_v6_ipv6only(sk2);
1050 int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1051 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1052
1053 if (!sk2_rcv_saddr && !sk_ipv6only)
1054 return 1;
1055
1056 if (addr_type2 == IPV6_ADDR_ANY &&
1057 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1058 return 1;
1059
1060 if (addr_type == IPV6_ADDR_ANY &&
1061 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1062 return 1;
1063
1064 if (sk2_rcv_saddr6 &&
1065 ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1066 return 1;
1067
1068 if (addr_type == IPV6_ADDR_MAPPED &&
1069 !sk2_ipv6only &&
1070 (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1071 return 1;
1072
1073 return 0;
1074 }
1075
1076 /* Gets referenced address, destroys ifaddr */
1077
1078 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1079 {
1080 if (net_ratelimit())
1081 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1082 if (ifp->flags&IFA_F_PERMANENT) {
1083 spin_lock_bh(&ifp->lock);
1084 addrconf_del_timer(ifp);
1085 ifp->flags |= IFA_F_TENTATIVE;
1086 spin_unlock_bh(&ifp->lock);
1087 in6_ifa_put(ifp);
1088 #ifdef CONFIG_IPV6_PRIVACY
1089 } else if (ifp->flags&IFA_F_TEMPORARY) {
1090 struct inet6_ifaddr *ifpub;
1091 spin_lock_bh(&ifp->lock);
1092 ifpub = ifp->ifpub;
1093 if (ifpub) {
1094 in6_ifa_hold(ifpub);
1095 spin_unlock_bh(&ifp->lock);
1096 ipv6_create_tempaddr(ifpub, ifp);
1097 in6_ifa_put(ifpub);
1098 } else {
1099 spin_unlock_bh(&ifp->lock);
1100 }
1101 ipv6_del_addr(ifp);
1102 #endif
1103 } else
1104 ipv6_del_addr(ifp);
1105 }
1106
1107
1108 /* Join to solicited addr multicast group. */
1109
1110 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1111 {
1112 struct in6_addr maddr;
1113
1114 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1115 return;
1116
1117 addrconf_addr_solict_mult(addr, &maddr);
1118 ipv6_dev_mc_inc(dev, &maddr);
1119 }
1120
1121 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1122 {
1123 struct in6_addr maddr;
1124
1125 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1126 return;
1127
1128 addrconf_addr_solict_mult(addr, &maddr);
1129 __ipv6_dev_mc_dec(idev, &maddr);
1130 }
1131
1132 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1133 {
1134 struct in6_addr addr;
1135 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1136 if (ipv6_addr_any(&addr))
1137 return;
1138 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1139 }
1140
1141 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1142 {
1143 struct in6_addr addr;
1144 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1145 if (ipv6_addr_any(&addr))
1146 return;
1147 __ipv6_dev_ac_dec(ifp->idev, &addr);
1148 }
1149
1150 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1151 {
1152 switch (dev->type) {
1153 case ARPHRD_ETHER:
1154 case ARPHRD_FDDI:
1155 case ARPHRD_IEEE802_TR:
1156 if (dev->addr_len != ETH_ALEN)
1157 return -1;
1158 memcpy(eui, dev->dev_addr, 3);
1159 memcpy(eui + 5, dev->dev_addr + 3, 3);
1160
1161 /*
1162 * The zSeries OSA network cards can be shared among various
1163 * OS instances, but the OSA cards have only one MAC address.
1164 * This leads to duplicate address conflicts in conjunction
1165 * with IPv6 if more than one instance uses the same card.
1166 *
1167 * The driver for these cards can deliver a unique 16-bit
1168 * identifier for each instance sharing the same card. It is
1169 * placed instead of 0xFFFE in the interface identifier. The
1170 * "u" bit of the interface identifier is not inverted in this
1171 * case. Hence the resulting interface identifier has local
1172 * scope according to RFC2373.
1173 */
1174 if (dev->dev_id) {
1175 eui[3] = (dev->dev_id >> 8) & 0xFF;
1176 eui[4] = dev->dev_id & 0xFF;
1177 } else {
1178 eui[3] = 0xFF;
1179 eui[4] = 0xFE;
1180 eui[0] ^= 2;
1181 }
1182 return 0;
1183 case ARPHRD_ARCNET:
1184 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1185 if (dev->addr_len != ARCNET_ALEN)
1186 return -1;
1187 memset(eui, 0, 7);
1188 eui[7] = *(u8*)dev->dev_addr;
1189 return 0;
1190 case ARPHRD_INFINIBAND:
1191 if (dev->addr_len != INFINIBAND_ALEN)
1192 return -1;
1193 memcpy(eui, dev->dev_addr + 12, 8);
1194 eui[0] |= 2;
1195 return 0;
1196 }
1197 return -1;
1198 }
1199
1200 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1201 {
1202 int err = -1;
1203 struct inet6_ifaddr *ifp;
1204
1205 read_lock_bh(&idev->lock);
1206 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1207 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1208 memcpy(eui, ifp->addr.s6_addr+8, 8);
1209 err = 0;
1210 break;
1211 }
1212 }
1213 read_unlock_bh(&idev->lock);
1214 return err;
1215 }
1216
1217 #ifdef CONFIG_IPV6_PRIVACY
1218 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1219 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1220 {
1221 struct net_device *dev;
1222 struct scatterlist sg[2];
1223
1224 sg_set_buf(&sg[0], idev->entropy, 8);
1225 sg_set_buf(&sg[1], idev->work_eui64, 8);
1226
1227 dev = idev->dev;
1228
1229 if (ipv6_generate_eui64(idev->work_eui64, dev)) {
1230 printk(KERN_INFO
1231 "__ipv6_regen_rndid(idev=%p): cannot get EUI64 identifier; use random bytes.\n",
1232 idev);
1233 get_random_bytes(idev->work_eui64, sizeof(idev->work_eui64));
1234 }
1235 regen:
1236 spin_lock(&md5_tfm_lock);
1237 if (unlikely(md5_tfm == NULL)) {
1238 spin_unlock(&md5_tfm_lock);
1239 return -1;
1240 }
1241 crypto_digest_init(md5_tfm);
1242 crypto_digest_update(md5_tfm, sg, 2);
1243 crypto_digest_final(md5_tfm, idev->work_digest);
1244 spin_unlock(&md5_tfm_lock);
1245
1246 memcpy(idev->rndid, &idev->work_digest[0], 8);
1247 idev->rndid[0] &= ~0x02;
1248 memcpy(idev->entropy, &idev->work_digest[8], 8);
1249
1250 /*
1251 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1252 * check if generated address is not inappropriate
1253 *
1254 * - Reserved subnet anycast (RFC 2526)
1255 * 11111101 11....11 1xxxxxxx
1256 * - ISATAP (draft-ietf-ngtrans-isatap-13.txt) 5.1
1257 * 00-00-5E-FE-xx-xx-xx-xx
1258 * - value 0
1259 * - XXX: already assigned to an address on the device
1260 */
1261 if (idev->rndid[0] == 0xfd &&
1262 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1263 (idev->rndid[7]&0x80))
1264 goto regen;
1265 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1266 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1267 goto regen;
1268 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1269 goto regen;
1270 }
1271
1272 return 0;
1273 }
1274
1275 static void ipv6_regen_rndid(unsigned long data)
1276 {
1277 struct inet6_dev *idev = (struct inet6_dev *) data;
1278 unsigned long expires;
1279
1280 read_lock_bh(&addrconf_lock);
1281 write_lock_bh(&idev->lock);
1282
1283 if (idev->dead)
1284 goto out;
1285
1286 if (__ipv6_regen_rndid(idev) < 0)
1287 goto out;
1288
1289 expires = jiffies +
1290 idev->cnf.temp_prefered_lft * HZ -
1291 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1292 if (time_before(expires, jiffies)) {
1293 printk(KERN_WARNING
1294 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1295 idev->dev->name);
1296 goto out;
1297 }
1298
1299 if (!mod_timer(&idev->regen_timer, expires))
1300 in6_dev_hold(idev);
1301
1302 out:
1303 write_unlock_bh(&idev->lock);
1304 read_unlock_bh(&addrconf_lock);
1305 in6_dev_put(idev);
1306 }
1307
1308 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1309 int ret = 0;
1310
1311 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1312 ret = __ipv6_regen_rndid(idev);
1313 return ret;
1314 }
1315 #endif
1316
1317 /*
1318 * Add prefix route.
1319 */
1320
1321 static void
1322 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1323 unsigned long expires, u32 flags)
1324 {
1325 struct in6_rtmsg rtmsg;
1326
1327 memset(&rtmsg, 0, sizeof(rtmsg));
1328 ipv6_addr_copy(&rtmsg.rtmsg_dst, pfx);
1329 rtmsg.rtmsg_dst_len = plen;
1330 rtmsg.rtmsg_metric = IP6_RT_PRIO_ADDRCONF;
1331 rtmsg.rtmsg_ifindex = dev->ifindex;
1332 rtmsg.rtmsg_info = expires;
1333 rtmsg.rtmsg_flags = RTF_UP|flags;
1334 rtmsg.rtmsg_type = RTMSG_NEWROUTE;
1335
1336 /* Prevent useless cloning on PtP SIT.
1337 This thing is done here expecting that the whole
1338 class of non-broadcast devices need not cloning.
1339 */
1340 if (dev->type == ARPHRD_SIT && (dev->flags&IFF_POINTOPOINT))
1341 rtmsg.rtmsg_flags |= RTF_NONEXTHOP;
1342
1343 ip6_route_add(&rtmsg, NULL, NULL, NULL);
1344 }
1345
1346 /* Create "default" multicast route to the interface */
1347
1348 static void addrconf_add_mroute(struct net_device *dev)
1349 {
1350 struct in6_rtmsg rtmsg;
1351
1352 memset(&rtmsg, 0, sizeof(rtmsg));
1353 ipv6_addr_set(&rtmsg.rtmsg_dst,
1354 htonl(0xFF000000), 0, 0, 0);
1355 rtmsg.rtmsg_dst_len = 8;
1356 rtmsg.rtmsg_metric = IP6_RT_PRIO_ADDRCONF;
1357 rtmsg.rtmsg_ifindex = dev->ifindex;
1358 rtmsg.rtmsg_flags = RTF_UP;
1359 rtmsg.rtmsg_type = RTMSG_NEWROUTE;
1360 ip6_route_add(&rtmsg, NULL, NULL, NULL);
1361 }
1362
1363 static void sit_route_add(struct net_device *dev)
1364 {
1365 struct in6_rtmsg rtmsg;
1366
1367 memset(&rtmsg, 0, sizeof(rtmsg));
1368
1369 rtmsg.rtmsg_type = RTMSG_NEWROUTE;
1370 rtmsg.rtmsg_metric = IP6_RT_PRIO_ADDRCONF;
1371
1372 /* prefix length - 96 bits "::d.d.d.d" */
1373 rtmsg.rtmsg_dst_len = 96;
1374 rtmsg.rtmsg_flags = RTF_UP|RTF_NONEXTHOP;
1375 rtmsg.rtmsg_ifindex = dev->ifindex;
1376
1377 ip6_route_add(&rtmsg, NULL, NULL, NULL);
1378 }
1379
1380 static void addrconf_add_lroute(struct net_device *dev)
1381 {
1382 struct in6_addr addr;
1383
1384 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1385 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1386 }
1387
1388 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1389 {
1390 struct inet6_dev *idev;
1391
1392 ASSERT_RTNL();
1393
1394 if ((idev = ipv6_find_idev(dev)) == NULL)
1395 return NULL;
1396
1397 /* Add default multicast route */
1398 addrconf_add_mroute(dev);
1399
1400 /* Add link local route */
1401 addrconf_add_lroute(dev);
1402 return idev;
1403 }
1404
1405 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1406 {
1407 struct prefix_info *pinfo;
1408 __u32 valid_lft;
1409 __u32 prefered_lft;
1410 int addr_type;
1411 unsigned long rt_expires;
1412 struct inet6_dev *in6_dev;
1413
1414 pinfo = (struct prefix_info *) opt;
1415
1416 if (len < sizeof(struct prefix_info)) {
1417 ADBG(("addrconf: prefix option too short\n"));
1418 return;
1419 }
1420
1421 /*
1422 * Validation checks ([ADDRCONF], page 19)
1423 */
1424
1425 addr_type = ipv6_addr_type(&pinfo->prefix);
1426
1427 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1428 return;
1429
1430 valid_lft = ntohl(pinfo->valid);
1431 prefered_lft = ntohl(pinfo->prefered);
1432
1433 if (prefered_lft > valid_lft) {
1434 if (net_ratelimit())
1435 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1436 return;
1437 }
1438
1439 in6_dev = in6_dev_get(dev);
1440
1441 if (in6_dev == NULL) {
1442 if (net_ratelimit())
1443 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1444 return;
1445 }
1446
1447 /*
1448 * Two things going on here:
1449 * 1) Add routes for on-link prefixes
1450 * 2) Configure prefixes with the auto flag set
1451 */
1452
1453 /* Avoid arithmetic overflow. Really, we could
1454 save rt_expires in seconds, likely valid_lft,
1455 but it would require division in fib gc, that it
1456 not good.
1457 */
1458 if (valid_lft >= 0x7FFFFFFF/HZ)
1459 rt_expires = 0;
1460 else
1461 rt_expires = jiffies + valid_lft * HZ;
1462
1463 if (pinfo->onlink) {
1464 struct rt6_info *rt;
1465 rt = rt6_lookup(&pinfo->prefix, NULL, dev->ifindex, 1);
1466
1467 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
1468 if (rt->rt6i_flags&RTF_EXPIRES) {
1469 if (valid_lft == 0) {
1470 ip6_del_rt(rt, NULL, NULL, NULL);
1471 rt = NULL;
1472 } else {
1473 rt->rt6i_expires = rt_expires;
1474 }
1475 }
1476 } else if (valid_lft) {
1477 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1478 dev, rt_expires, RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT);
1479 }
1480 if (rt)
1481 dst_release(&rt->u.dst);
1482 }
1483
1484 /* Try to figure out our local address for this prefix */
1485
1486 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1487 struct inet6_ifaddr * ifp;
1488 struct in6_addr addr;
1489 int create = 0, update_lft = 0;
1490
1491 if (pinfo->prefix_len == 64) {
1492 memcpy(&addr, &pinfo->prefix, 8);
1493 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1494 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1495 in6_dev_put(in6_dev);
1496 return;
1497 }
1498 goto ok;
1499 }
1500 if (net_ratelimit())
1501 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1502 pinfo->prefix_len);
1503 in6_dev_put(in6_dev);
1504 return;
1505
1506 ok:
1507
1508 ifp = ipv6_get_ifaddr(&addr, dev, 1);
1509
1510 if (ifp == NULL && valid_lft) {
1511 int max_addresses = in6_dev->cnf.max_addresses;
1512
1513 /* Do not allow to create too much of autoconfigured
1514 * addresses; this would be too easy way to crash kernel.
1515 */
1516 if (!max_addresses ||
1517 ipv6_count_addresses(in6_dev) < max_addresses)
1518 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1519 addr_type&IPV6_ADDR_SCOPE_MASK, 0);
1520
1521 if (!ifp || IS_ERR(ifp)) {
1522 in6_dev_put(in6_dev);
1523 return;
1524 }
1525
1526 update_lft = create = 1;
1527 ifp->cstamp = jiffies;
1528 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1529 }
1530
1531 if (ifp) {
1532 int flags;
1533 unsigned long now;
1534 #ifdef CONFIG_IPV6_PRIVACY
1535 struct inet6_ifaddr *ift;
1536 #endif
1537 u32 stored_lft;
1538
1539 /* update lifetime (RFC2462 5.5.3 e) */
1540 spin_lock(&ifp->lock);
1541 now = jiffies;
1542 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1543 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1544 else
1545 stored_lft = 0;
1546 if (!update_lft && stored_lft) {
1547 if (valid_lft > MIN_VALID_LIFETIME ||
1548 valid_lft > stored_lft)
1549 update_lft = 1;
1550 else if (stored_lft <= MIN_VALID_LIFETIME) {
1551 /* valid_lft <= stored_lft is always true */
1552 /* XXX: IPsec */
1553 update_lft = 0;
1554 } else {
1555 valid_lft = MIN_VALID_LIFETIME;
1556 if (valid_lft < prefered_lft)
1557 prefered_lft = valid_lft;
1558 update_lft = 1;
1559 }
1560 }
1561
1562 if (update_lft) {
1563 ifp->valid_lft = valid_lft;
1564 ifp->prefered_lft = prefered_lft;
1565 ifp->tstamp = now;
1566 flags = ifp->flags;
1567 ifp->flags &= ~IFA_F_DEPRECATED;
1568 spin_unlock(&ifp->lock);
1569
1570 if (!(flags&IFA_F_TENTATIVE))
1571 ipv6_ifa_notify(0, ifp);
1572 } else
1573 spin_unlock(&ifp->lock);
1574
1575 #ifdef CONFIG_IPV6_PRIVACY
1576 read_lock_bh(&in6_dev->lock);
1577 /* update all temporary addresses in the list */
1578 for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1579 /*
1580 * When adjusting the lifetimes of an existing
1581 * temporary address, only lower the lifetimes.
1582 * Implementations must not increase the
1583 * lifetimes of an existing temporary address
1584 * when processing a Prefix Information Option.
1585 */
1586 spin_lock(&ift->lock);
1587 flags = ift->flags;
1588 if (ift->valid_lft > valid_lft &&
1589 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1590 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1591 if (ift->prefered_lft > prefered_lft &&
1592 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1593 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1594 spin_unlock(&ift->lock);
1595 if (!(flags&IFA_F_TENTATIVE))
1596 ipv6_ifa_notify(0, ift);
1597 }
1598
1599 if (create && in6_dev->cnf.use_tempaddr > 0) {
1600 /*
1601 * When a new public address is created as described in [ADDRCONF],
1602 * also create a new temporary address.
1603 */
1604 read_unlock_bh(&in6_dev->lock);
1605 ipv6_create_tempaddr(ifp, NULL);
1606 } else {
1607 read_unlock_bh(&in6_dev->lock);
1608 }
1609 #endif
1610 in6_ifa_put(ifp);
1611 addrconf_verify(0);
1612 }
1613 }
1614 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
1615 in6_dev_put(in6_dev);
1616 }
1617
1618 /*
1619 * Set destination address.
1620 * Special case for SIT interfaces where we create a new "virtual"
1621 * device.
1622 */
1623 int addrconf_set_dstaddr(void __user *arg)
1624 {
1625 struct in6_ifreq ireq;
1626 struct net_device *dev;
1627 int err = -EINVAL;
1628
1629 rtnl_lock();
1630
1631 err = -EFAULT;
1632 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1633 goto err_exit;
1634
1635 dev = __dev_get_by_index(ireq.ifr6_ifindex);
1636
1637 err = -ENODEV;
1638 if (dev == NULL)
1639 goto err_exit;
1640
1641 if (dev->type == ARPHRD_SIT) {
1642 struct ifreq ifr;
1643 mm_segment_t oldfs;
1644 struct ip_tunnel_parm p;
1645
1646 err = -EADDRNOTAVAIL;
1647 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
1648 goto err_exit;
1649
1650 memset(&p, 0, sizeof(p));
1651 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
1652 p.iph.saddr = 0;
1653 p.iph.version = 4;
1654 p.iph.ihl = 5;
1655 p.iph.protocol = IPPROTO_IPV6;
1656 p.iph.ttl = 64;
1657 ifr.ifr_ifru.ifru_data = (void __user *)&p;
1658
1659 oldfs = get_fs(); set_fs(KERNEL_DS);
1660 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
1661 set_fs(oldfs);
1662
1663 if (err == 0) {
1664 err = -ENOBUFS;
1665 if ((dev = __dev_get_by_name(p.name)) == NULL)
1666 goto err_exit;
1667 err = dev_open(dev);
1668 }
1669 }
1670
1671 err_exit:
1672 rtnl_unlock();
1673 return err;
1674 }
1675
1676 /*
1677 * Manual configuration of address on an interface
1678 */
1679 static int inet6_addr_add(int ifindex, struct in6_addr *pfx, int plen)
1680 {
1681 struct inet6_ifaddr *ifp;
1682 struct inet6_dev *idev;
1683 struct net_device *dev;
1684 int scope;
1685
1686 ASSERT_RTNL();
1687
1688 if ((dev = __dev_get_by_index(ifindex)) == NULL)
1689 return -ENODEV;
1690
1691 if (!(dev->flags&IFF_UP))
1692 return -ENETDOWN;
1693
1694 if ((idev = addrconf_add_dev(dev)) == NULL)
1695 return -ENOBUFS;
1696
1697 scope = ipv6_addr_scope(pfx);
1698
1699 ifp = ipv6_add_addr(idev, pfx, plen, scope, IFA_F_PERMANENT);
1700 if (!IS_ERR(ifp)) {
1701 addrconf_dad_start(ifp, 0);
1702 in6_ifa_put(ifp);
1703 return 0;
1704 }
1705
1706 return PTR_ERR(ifp);
1707 }
1708
1709 static int inet6_addr_del(int ifindex, struct in6_addr *pfx, int plen)
1710 {
1711 struct inet6_ifaddr *ifp;
1712 struct inet6_dev *idev;
1713 struct net_device *dev;
1714
1715 if ((dev = __dev_get_by_index(ifindex)) == NULL)
1716 return -ENODEV;
1717
1718 if ((idev = __in6_dev_get(dev)) == NULL)
1719 return -ENXIO;
1720
1721 read_lock_bh(&idev->lock);
1722 for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
1723 if (ifp->prefix_len == plen &&
1724 ipv6_addr_equal(pfx, &ifp->addr)) {
1725 in6_ifa_hold(ifp);
1726 read_unlock_bh(&idev->lock);
1727
1728 ipv6_del_addr(ifp);
1729
1730 /* If the last address is deleted administratively,
1731 disable IPv6 on this interface.
1732 */
1733 if (idev->addr_list == NULL)
1734 addrconf_ifdown(idev->dev, 1);
1735 return 0;
1736 }
1737 }
1738 read_unlock_bh(&idev->lock);
1739 return -EADDRNOTAVAIL;
1740 }
1741
1742
1743 int addrconf_add_ifaddr(void __user *arg)
1744 {
1745 struct in6_ifreq ireq;
1746 int err;
1747
1748 if (!capable(CAP_NET_ADMIN))
1749 return -EPERM;
1750
1751 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1752 return -EFAULT;
1753
1754 rtnl_lock();
1755 err = inet6_addr_add(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
1756 rtnl_unlock();
1757 return err;
1758 }
1759
1760 int addrconf_del_ifaddr(void __user *arg)
1761 {
1762 struct in6_ifreq ireq;
1763 int err;
1764
1765 if (!capable(CAP_NET_ADMIN))
1766 return -EPERM;
1767
1768 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1769 return -EFAULT;
1770
1771 rtnl_lock();
1772 err = inet6_addr_del(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
1773 rtnl_unlock();
1774 return err;
1775 }
1776
1777 static void sit_add_v4_addrs(struct inet6_dev *idev)
1778 {
1779 struct inet6_ifaddr * ifp;
1780 struct in6_addr addr;
1781 struct net_device *dev;
1782 int scope;
1783
1784 ASSERT_RTNL();
1785
1786 memset(&addr, 0, sizeof(struct in6_addr));
1787 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
1788
1789 if (idev->dev->flags&IFF_POINTOPOINT) {
1790 addr.s6_addr32[0] = htonl(0xfe800000);
1791 scope = IFA_LINK;
1792 } else {
1793 scope = IPV6_ADDR_COMPATv4;
1794 }
1795
1796 if (addr.s6_addr32[3]) {
1797 ifp = ipv6_add_addr(idev, &addr, 128, scope, 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 return;
1806 }
1807
1808 for (dev = dev_base; dev != NULL; dev = dev->next) {
1809 struct in_device * in_dev = __in_dev_get_rtnl(dev);
1810 if (in_dev && (dev->flags & IFF_UP)) {
1811 struct in_ifaddr * ifa;
1812
1813 int flag = scope;
1814
1815 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1816 int plen;
1817
1818 addr.s6_addr32[3] = ifa->ifa_local;
1819
1820 if (ifa->ifa_scope == RT_SCOPE_LINK)
1821 continue;
1822 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
1823 if (idev->dev->flags&IFF_POINTOPOINT)
1824 continue;
1825 flag |= IFA_HOST;
1826 }
1827 if (idev->dev->flags&IFF_POINTOPOINT)
1828 plen = 64;
1829 else
1830 plen = 96;
1831
1832 ifp = ipv6_add_addr(idev, &addr, plen, flag,
1833 IFA_F_PERMANENT);
1834 if (!IS_ERR(ifp)) {
1835 spin_lock_bh(&ifp->lock);
1836 ifp->flags &= ~IFA_F_TENTATIVE;
1837 spin_unlock_bh(&ifp->lock);
1838 ipv6_ifa_notify(RTM_NEWADDR, ifp);
1839 in6_ifa_put(ifp);
1840 }
1841 }
1842 }
1843 }
1844 }
1845
1846 static void init_loopback(struct net_device *dev)
1847 {
1848 struct inet6_dev *idev;
1849 struct inet6_ifaddr * ifp;
1850
1851 /* ::1 */
1852
1853 ASSERT_RTNL();
1854
1855 if ((idev = ipv6_find_idev(dev)) == NULL) {
1856 printk(KERN_DEBUG "init loopback: add_dev failed\n");
1857 return;
1858 }
1859
1860 ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
1861 if (!IS_ERR(ifp)) {
1862 spin_lock_bh(&ifp->lock);
1863 ifp->flags &= ~IFA_F_TENTATIVE;
1864 spin_unlock_bh(&ifp->lock);
1865 ipv6_ifa_notify(RTM_NEWADDR, ifp);
1866 in6_ifa_put(ifp);
1867 }
1868 }
1869
1870 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
1871 {
1872 struct inet6_ifaddr * ifp;
1873
1874 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, IFA_F_PERMANENT);
1875 if (!IS_ERR(ifp)) {
1876 addrconf_dad_start(ifp, 0);
1877 in6_ifa_put(ifp);
1878 }
1879 }
1880
1881 static void addrconf_dev_config(struct net_device *dev)
1882 {
1883 struct in6_addr addr;
1884 struct inet6_dev * idev;
1885
1886 ASSERT_RTNL();
1887
1888 if ((dev->type != ARPHRD_ETHER) &&
1889 (dev->type != ARPHRD_FDDI) &&
1890 (dev->type != ARPHRD_IEEE802_TR) &&
1891 (dev->type != ARPHRD_ARCNET) &&
1892 (dev->type != ARPHRD_INFINIBAND)) {
1893 /* Alas, we support only Ethernet autoconfiguration. */
1894 return;
1895 }
1896
1897 idev = addrconf_add_dev(dev);
1898 if (idev == NULL)
1899 return;
1900
1901 memset(&addr, 0, sizeof(struct in6_addr));
1902 addr.s6_addr32[0] = htonl(0xFE800000);
1903
1904 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
1905 addrconf_add_linklocal(idev, &addr);
1906 }
1907
1908 static void addrconf_sit_config(struct net_device *dev)
1909 {
1910 struct inet6_dev *idev;
1911
1912 ASSERT_RTNL();
1913
1914 /*
1915 * Configure the tunnel with one of our IPv4
1916 * addresses... we should configure all of
1917 * our v4 addrs in the tunnel
1918 */
1919
1920 if ((idev = ipv6_find_idev(dev)) == NULL) {
1921 printk(KERN_DEBUG "init sit: add_dev failed\n");
1922 return;
1923 }
1924
1925 sit_add_v4_addrs(idev);
1926
1927 if (dev->flags&IFF_POINTOPOINT) {
1928 addrconf_add_mroute(dev);
1929 addrconf_add_lroute(dev);
1930 } else
1931 sit_route_add(dev);
1932 }
1933
1934 static inline int
1935 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
1936 {
1937 struct in6_addr lladdr;
1938
1939 if (!ipv6_get_lladdr(link_dev, &lladdr)) {
1940 addrconf_add_linklocal(idev, &lladdr);
1941 return 0;
1942 }
1943 return -1;
1944 }
1945
1946 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
1947 {
1948 struct net_device *link_dev;
1949
1950 /* first try to inherit the link-local address from the link device */
1951 if (idev->dev->iflink &&
1952 (link_dev = __dev_get_by_index(idev->dev->iflink))) {
1953 if (!ipv6_inherit_linklocal(idev, link_dev))
1954 return;
1955 }
1956 /* then try to inherit it from any device */
1957 for (link_dev = dev_base; link_dev; link_dev = link_dev->next) {
1958 if (!ipv6_inherit_linklocal(idev, link_dev))
1959 return;
1960 }
1961 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
1962 }
1963
1964 /*
1965 * Autoconfigure tunnel with a link-local address so routing protocols,
1966 * DHCPv6, MLD etc. can be run over the virtual link
1967 */
1968
1969 static void addrconf_ip6_tnl_config(struct net_device *dev)
1970 {
1971 struct inet6_dev *idev;
1972
1973 ASSERT_RTNL();
1974
1975 if ((idev = addrconf_add_dev(dev)) == NULL) {
1976 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
1977 return;
1978 }
1979 ip6_tnl_add_linklocal(idev);
1980 addrconf_add_mroute(dev);
1981 }
1982
1983 static int addrconf_notify(struct notifier_block *this, unsigned long event,
1984 void * data)
1985 {
1986 struct net_device *dev = (struct net_device *) data;
1987 struct inet6_dev *idev = __in6_dev_get(dev);
1988
1989 switch(event) {
1990 case NETDEV_UP:
1991 switch(dev->type) {
1992 case ARPHRD_SIT:
1993 addrconf_sit_config(dev);
1994 break;
1995 case ARPHRD_TUNNEL6:
1996 addrconf_ip6_tnl_config(dev);
1997 break;
1998 case ARPHRD_LOOPBACK:
1999 init_loopback(dev);
2000 break;
2001
2002 default:
2003 addrconf_dev_config(dev);
2004 break;
2005 };
2006 if (idev) {
2007 /* If the MTU changed during the interface down, when the
2008 interface up, the changed MTU must be reflected in the
2009 idev as well as routers.
2010 */
2011 if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2012 rt6_mtu_change(dev, dev->mtu);
2013 idev->cnf.mtu6 = dev->mtu;
2014 }
2015 idev->tstamp = jiffies;
2016 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2017 /* If the changed mtu during down is lower than IPV6_MIN_MTU
2018 stop IPv6 on this interface.
2019 */
2020 if (dev->mtu < IPV6_MIN_MTU)
2021 addrconf_ifdown(dev, event != NETDEV_DOWN);
2022 }
2023 break;
2024
2025 case NETDEV_CHANGEMTU:
2026 if ( idev && dev->mtu >= IPV6_MIN_MTU) {
2027 rt6_mtu_change(dev, dev->mtu);
2028 idev->cnf.mtu6 = dev->mtu;
2029 break;
2030 }
2031
2032 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2033
2034 case NETDEV_DOWN:
2035 case NETDEV_UNREGISTER:
2036 /*
2037 * Remove all addresses from this interface.
2038 */
2039 addrconf_ifdown(dev, event != NETDEV_DOWN);
2040 break;
2041 case NETDEV_CHANGE:
2042 break;
2043 case NETDEV_CHANGENAME:
2044 #ifdef CONFIG_SYSCTL
2045 if (idev) {
2046 addrconf_sysctl_unregister(&idev->cnf);
2047 neigh_sysctl_unregister(idev->nd_parms);
2048 neigh_sysctl_register(dev, idev->nd_parms,
2049 NET_IPV6, NET_IPV6_NEIGH, "ipv6",
2050 &ndisc_ifinfo_sysctl_change,
2051 NULL);
2052 addrconf_sysctl_register(idev, &idev->cnf);
2053 }
2054 #endif
2055 break;
2056 };
2057
2058 return NOTIFY_OK;
2059 }
2060
2061 /*
2062 * addrconf module should be notified of a device going up
2063 */
2064 static struct notifier_block ipv6_dev_notf = {
2065 .notifier_call = addrconf_notify,
2066 .priority = 0
2067 };
2068
2069 static int addrconf_ifdown(struct net_device *dev, int how)
2070 {
2071 struct inet6_dev *idev;
2072 struct inet6_ifaddr *ifa, **bifa;
2073 int i;
2074
2075 ASSERT_RTNL();
2076
2077 if (dev == &loopback_dev && how == 1)
2078 how = 0;
2079
2080 rt6_ifdown(dev);
2081 neigh_ifdown(&nd_tbl, dev);
2082
2083 idev = __in6_dev_get(dev);
2084 if (idev == NULL)
2085 return -ENODEV;
2086
2087 /* Step 1: remove reference to ipv6 device from parent device.
2088 Do not dev_put!
2089 */
2090 if (how == 1) {
2091 write_lock_bh(&addrconf_lock);
2092 dev->ip6_ptr = NULL;
2093 idev->dead = 1;
2094 write_unlock_bh(&addrconf_lock);
2095
2096 /* Step 1.5: remove snmp6 entry */
2097 snmp6_unregister_dev(idev);
2098
2099 }
2100
2101 /* Step 2: clear hash table */
2102 for (i=0; i<IN6_ADDR_HSIZE; i++) {
2103 bifa = &inet6_addr_lst[i];
2104
2105 write_lock_bh(&addrconf_hash_lock);
2106 while ((ifa = *bifa) != NULL) {
2107 if (ifa->idev == idev) {
2108 *bifa = ifa->lst_next;
2109 ifa->lst_next = NULL;
2110 addrconf_del_timer(ifa);
2111 in6_ifa_put(ifa);
2112 continue;
2113 }
2114 bifa = &ifa->lst_next;
2115 }
2116 write_unlock_bh(&addrconf_hash_lock);
2117 }
2118
2119 write_lock_bh(&idev->lock);
2120
2121 /* Step 3: clear flags for stateless addrconf */
2122 if (how != 1)
2123 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD);
2124
2125 /* Step 4: clear address list */
2126 #ifdef CONFIG_IPV6_PRIVACY
2127 if (how == 1 && del_timer(&idev->regen_timer))
2128 in6_dev_put(idev);
2129
2130 /* clear tempaddr list */
2131 while ((ifa = idev->tempaddr_list) != NULL) {
2132 idev->tempaddr_list = ifa->tmp_next;
2133 ifa->tmp_next = NULL;
2134 ifa->dead = 1;
2135 write_unlock_bh(&idev->lock);
2136 spin_lock_bh(&ifa->lock);
2137
2138 if (ifa->ifpub) {
2139 in6_ifa_put(ifa->ifpub);
2140 ifa->ifpub = NULL;
2141 }
2142 spin_unlock_bh(&ifa->lock);
2143 in6_ifa_put(ifa);
2144 write_lock_bh(&idev->lock);
2145 }
2146 #endif
2147 while ((ifa = idev->addr_list) != NULL) {
2148 idev->addr_list = ifa->if_next;
2149 ifa->if_next = NULL;
2150 ifa->dead = 1;
2151 addrconf_del_timer(ifa);
2152 write_unlock_bh(&idev->lock);
2153
2154 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2155 in6_ifa_put(ifa);
2156
2157 write_lock_bh(&idev->lock);
2158 }
2159 write_unlock_bh(&idev->lock);
2160
2161 /* Step 5: Discard multicast list */
2162
2163 if (how == 1)
2164 ipv6_mc_destroy_dev(idev);
2165 else
2166 ipv6_mc_down(idev);
2167
2168 /* Step 5: netlink notification of this interface */
2169 idev->tstamp = jiffies;
2170 inet6_ifinfo_notify(RTM_DELLINK, idev);
2171
2172 /* Shot the device (if unregistered) */
2173
2174 if (how == 1) {
2175 #ifdef CONFIG_SYSCTL
2176 addrconf_sysctl_unregister(&idev->cnf);
2177 neigh_sysctl_unregister(idev->nd_parms);
2178 #endif
2179 neigh_parms_release(&nd_tbl, idev->nd_parms);
2180 neigh_ifdown(&nd_tbl, dev);
2181 in6_dev_put(idev);
2182 }
2183 return 0;
2184 }
2185
2186 static void addrconf_rs_timer(unsigned long data)
2187 {
2188 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2189
2190 if (ifp->idev->cnf.forwarding)
2191 goto out;
2192
2193 if (ifp->idev->if_flags & IF_RA_RCVD) {
2194 /*
2195 * Announcement received after solicitation
2196 * was sent
2197 */
2198 goto out;
2199 }
2200
2201 spin_lock(&ifp->lock);
2202 if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2203 struct in6_addr all_routers;
2204
2205 /* The wait after the last probe can be shorter */
2206 addrconf_mod_timer(ifp, AC_RS,
2207 (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2208 ifp->idev->cnf.rtr_solicit_delay :
2209 ifp->idev->cnf.rtr_solicit_interval);
2210 spin_unlock(&ifp->lock);
2211
2212 ipv6_addr_all_routers(&all_routers);
2213
2214 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2215 } else {
2216 spin_unlock(&ifp->lock);
2217 /*
2218 * Note: we do not support deprecated "all on-link"
2219 * assumption any longer.
2220 */
2221 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2222 ifp->idev->dev->name);
2223 }
2224
2225 out:
2226 in6_ifa_put(ifp);
2227 }
2228
2229 /*
2230 * Duplicate Address Detection
2231 */
2232 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2233 {
2234 struct inet6_dev *idev = ifp->idev;
2235 struct net_device *dev = idev->dev;
2236 unsigned long rand_num;
2237
2238 addrconf_join_solict(dev, &ifp->addr);
2239
2240 if (ifp->prefix_len != 128 && (ifp->flags&IFA_F_PERMANENT))
2241 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 0,
2242 flags);
2243
2244 net_srandom(ifp->addr.s6_addr32[3]);
2245 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2246
2247 read_lock_bh(&idev->lock);
2248 if (ifp->dead)
2249 goto out;
2250 spin_lock_bh(&ifp->lock);
2251
2252 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2253 !(ifp->flags&IFA_F_TENTATIVE)) {
2254 ifp->flags &= ~IFA_F_TENTATIVE;
2255 spin_unlock_bh(&ifp->lock);
2256 read_unlock_bh(&idev->lock);
2257
2258 addrconf_dad_completed(ifp);
2259 return;
2260 }
2261
2262 ifp->probes = idev->cnf.dad_transmits;
2263 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2264
2265 spin_unlock_bh(&ifp->lock);
2266 out:
2267 read_unlock_bh(&idev->lock);
2268 }
2269
2270 static void addrconf_dad_timer(unsigned long data)
2271 {
2272 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2273 struct inet6_dev *idev = ifp->idev;
2274 struct in6_addr unspec;
2275 struct in6_addr mcaddr;
2276
2277 read_lock_bh(&idev->lock);
2278 if (idev->dead) {
2279 read_unlock_bh(&idev->lock);
2280 goto out;
2281 }
2282 spin_lock_bh(&ifp->lock);
2283 if (ifp->probes == 0) {
2284 /*
2285 * DAD was successful
2286 */
2287
2288 ifp->flags &= ~IFA_F_TENTATIVE;
2289 spin_unlock_bh(&ifp->lock);
2290 read_unlock_bh(&idev->lock);
2291
2292 addrconf_dad_completed(ifp);
2293
2294 goto out;
2295 }
2296
2297 ifp->probes--;
2298 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2299 spin_unlock_bh(&ifp->lock);
2300 read_unlock_bh(&idev->lock);
2301
2302 /* send a neighbour solicitation for our addr */
2303 memset(&unspec, 0, sizeof(unspec));
2304 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2305 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec);
2306 out:
2307 in6_ifa_put(ifp);
2308 }
2309
2310 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2311 {
2312 struct net_device * dev = ifp->idev->dev;
2313
2314 /*
2315 * Configure the address for reception. Now it is valid.
2316 */
2317
2318 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2319
2320 /* If added prefix is link local and forwarding is off,
2321 start sending router solicitations.
2322 */
2323
2324 if (ifp->idev->cnf.forwarding == 0 &&
2325 ifp->idev->cnf.rtr_solicits > 0 &&
2326 (dev->flags&IFF_LOOPBACK) == 0 &&
2327 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2328 struct in6_addr all_routers;
2329
2330 ipv6_addr_all_routers(&all_routers);
2331
2332 /*
2333 * If a host as already performed a random delay
2334 * [...] as part of DAD [...] there is no need
2335 * to delay again before sending the first RS
2336 */
2337 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2338
2339 spin_lock_bh(&ifp->lock);
2340 ifp->probes = 1;
2341 ifp->idev->if_flags |= IF_RS_SENT;
2342 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2343 spin_unlock_bh(&ifp->lock);
2344 }
2345 }
2346
2347 #ifdef CONFIG_PROC_FS
2348 struct if6_iter_state {
2349 int bucket;
2350 };
2351
2352 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2353 {
2354 struct inet6_ifaddr *ifa = NULL;
2355 struct if6_iter_state *state = seq->private;
2356
2357 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2358 ifa = inet6_addr_lst[state->bucket];
2359 if (ifa)
2360 break;
2361 }
2362 return ifa;
2363 }
2364
2365 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2366 {
2367 struct if6_iter_state *state = seq->private;
2368
2369 ifa = ifa->lst_next;
2370 try_again:
2371 if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2372 ifa = inet6_addr_lst[state->bucket];
2373 goto try_again;
2374 }
2375 return ifa;
2376 }
2377
2378 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2379 {
2380 struct inet6_ifaddr *ifa = if6_get_first(seq);
2381
2382 if (ifa)
2383 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2384 --pos;
2385 return pos ? NULL : ifa;
2386 }
2387
2388 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2389 {
2390 read_lock_bh(&addrconf_hash_lock);
2391 return if6_get_idx(seq, *pos);
2392 }
2393
2394 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2395 {
2396 struct inet6_ifaddr *ifa;
2397
2398 ifa = if6_get_next(seq, v);
2399 ++*pos;
2400 return ifa;
2401 }
2402
2403 static void if6_seq_stop(struct seq_file *seq, void *v)
2404 {
2405 read_unlock_bh(&addrconf_hash_lock);
2406 }
2407
2408 static int if6_seq_show(struct seq_file *seq, void *v)
2409 {
2410 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2411 seq_printf(seq,
2412 "%04x%04x%04x%04x%04x%04x%04x%04x %02x %02x %02x %02x %8s\n",
2413 NIP6(ifp->addr),
2414 ifp->idev->dev->ifindex,
2415 ifp->prefix_len,
2416 ifp->scope,
2417 ifp->flags,
2418 ifp->idev->dev->name);
2419 return 0;
2420 }
2421
2422 static struct seq_operations if6_seq_ops = {
2423 .start = if6_seq_start,
2424 .next = if6_seq_next,
2425 .show = if6_seq_show,
2426 .stop = if6_seq_stop,
2427 };
2428
2429 static int if6_seq_open(struct inode *inode, struct file *file)
2430 {
2431 struct seq_file *seq;
2432 int rc = -ENOMEM;
2433 struct if6_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL);
2434
2435 if (!s)
2436 goto out;
2437 memset(s, 0, sizeof(*s));
2438
2439 rc = seq_open(file, &if6_seq_ops);
2440 if (rc)
2441 goto out_kfree;
2442
2443 seq = file->private_data;
2444 seq->private = s;
2445 out:
2446 return rc;
2447 out_kfree:
2448 kfree(s);
2449 goto out;
2450 }
2451
2452 static struct file_operations if6_fops = {
2453 .owner = THIS_MODULE,
2454 .open = if6_seq_open,
2455 .read = seq_read,
2456 .llseek = seq_lseek,
2457 .release = seq_release_private,
2458 };
2459
2460 int __init if6_proc_init(void)
2461 {
2462 if (!proc_net_fops_create("if_inet6", S_IRUGO, &if6_fops))
2463 return -ENOMEM;
2464 return 0;
2465 }
2466
2467 void if6_proc_exit(void)
2468 {
2469 proc_net_remove("if_inet6");
2470 }
2471 #endif /* CONFIG_PROC_FS */
2472
2473 /*
2474 * Periodic address status verification
2475 */
2476
2477 static void addrconf_verify(unsigned long foo)
2478 {
2479 struct inet6_ifaddr *ifp;
2480 unsigned long now, next;
2481 int i;
2482
2483 spin_lock_bh(&addrconf_verify_lock);
2484 now = jiffies;
2485 next = now + ADDR_CHECK_FREQUENCY;
2486
2487 del_timer(&addr_chk_timer);
2488
2489 for (i=0; i < IN6_ADDR_HSIZE; i++) {
2490
2491 restart:
2492 write_lock(&addrconf_hash_lock);
2493 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
2494 unsigned long age;
2495 #ifdef CONFIG_IPV6_PRIVACY
2496 unsigned long regen_advance;
2497 #endif
2498
2499 if (ifp->flags & IFA_F_PERMANENT)
2500 continue;
2501
2502 spin_lock(&ifp->lock);
2503 age = (now - ifp->tstamp) / HZ;
2504
2505 #ifdef CONFIG_IPV6_PRIVACY
2506 regen_advance = ifp->idev->cnf.regen_max_retry *
2507 ifp->idev->cnf.dad_transmits *
2508 ifp->idev->nd_parms->retrans_time / HZ;
2509 #endif
2510
2511 if (age >= ifp->valid_lft) {
2512 spin_unlock(&ifp->lock);
2513 in6_ifa_hold(ifp);
2514 write_unlock(&addrconf_hash_lock);
2515 ipv6_del_addr(ifp);
2516 goto restart;
2517 } else if (age >= ifp->prefered_lft) {
2518 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
2519 int deprecate = 0;
2520
2521 if (!(ifp->flags&IFA_F_DEPRECATED)) {
2522 deprecate = 1;
2523 ifp->flags |= IFA_F_DEPRECATED;
2524 }
2525
2526 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
2527 next = ifp->tstamp + ifp->valid_lft * HZ;
2528
2529 spin_unlock(&ifp->lock);
2530
2531 if (deprecate) {
2532 in6_ifa_hold(ifp);
2533 write_unlock(&addrconf_hash_lock);
2534
2535 ipv6_ifa_notify(0, ifp);
2536 in6_ifa_put(ifp);
2537 goto restart;
2538 }
2539 #ifdef CONFIG_IPV6_PRIVACY
2540 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
2541 !(ifp->flags&IFA_F_TENTATIVE)) {
2542 if (age >= ifp->prefered_lft - regen_advance) {
2543 struct inet6_ifaddr *ifpub = ifp->ifpub;
2544 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2545 next = ifp->tstamp + ifp->prefered_lft * HZ;
2546 if (!ifp->regen_count && ifpub) {
2547 ifp->regen_count++;
2548 in6_ifa_hold(ifp);
2549 in6_ifa_hold(ifpub);
2550 spin_unlock(&ifp->lock);
2551 write_unlock(&addrconf_hash_lock);
2552 ipv6_create_tempaddr(ifpub, ifp);
2553 in6_ifa_put(ifpub);
2554 in6_ifa_put(ifp);
2555 goto restart;
2556 }
2557 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
2558 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
2559 spin_unlock(&ifp->lock);
2560 #endif
2561 } else {
2562 /* ifp->prefered_lft <= ifp->valid_lft */
2563 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2564 next = ifp->tstamp + ifp->prefered_lft * HZ;
2565 spin_unlock(&ifp->lock);
2566 }
2567 }
2568 write_unlock(&addrconf_hash_lock);
2569 }
2570
2571 addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
2572 add_timer(&addr_chk_timer);
2573 spin_unlock_bh(&addrconf_verify_lock);
2574 }
2575
2576 static int
2577 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
2578 {
2579 struct rtattr **rta = arg;
2580 struct ifaddrmsg *ifm = NLMSG_DATA(nlh);
2581 struct in6_addr *pfx;
2582
2583 pfx = NULL;
2584 if (rta[IFA_ADDRESS-1]) {
2585 if (RTA_PAYLOAD(rta[IFA_ADDRESS-1]) < sizeof(*pfx))
2586 return -EINVAL;
2587 pfx = RTA_DATA(rta[IFA_ADDRESS-1]);
2588 }
2589 if (rta[IFA_LOCAL-1]) {
2590 if (pfx && memcmp(pfx, RTA_DATA(rta[IFA_LOCAL-1]), sizeof(*pfx)))
2591 return -EINVAL;
2592 pfx = RTA_DATA(rta[IFA_LOCAL-1]);
2593 }
2594 if (pfx == NULL)
2595 return -EINVAL;
2596
2597 return inet6_addr_del(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
2598 }
2599
2600 static int
2601 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
2602 {
2603 struct rtattr **rta = arg;
2604 struct ifaddrmsg *ifm = NLMSG_DATA(nlh);
2605 struct in6_addr *pfx;
2606
2607 pfx = NULL;
2608 if (rta[IFA_ADDRESS-1]) {
2609 if (RTA_PAYLOAD(rta[IFA_ADDRESS-1]) < sizeof(*pfx))
2610 return -EINVAL;
2611 pfx = RTA_DATA(rta[IFA_ADDRESS-1]);
2612 }
2613 if (rta[IFA_LOCAL-1]) {
2614 if (pfx && memcmp(pfx, RTA_DATA(rta[IFA_LOCAL-1]), sizeof(*pfx)))
2615 return -EINVAL;
2616 pfx = RTA_DATA(rta[IFA_LOCAL-1]);
2617 }
2618 if (pfx == NULL)
2619 return -EINVAL;
2620
2621 return inet6_addr_add(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
2622 }
2623
2624 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
2625 u32 pid, u32 seq, int event, unsigned int flags)
2626 {
2627 struct ifaddrmsg *ifm;
2628 struct nlmsghdr *nlh;
2629 struct ifa_cacheinfo ci;
2630 unsigned char *b = skb->tail;
2631
2632 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags);
2633 ifm = NLMSG_DATA(nlh);
2634 ifm->ifa_family = AF_INET6;
2635 ifm->ifa_prefixlen = ifa->prefix_len;
2636 ifm->ifa_flags = ifa->flags;
2637 ifm->ifa_scope = RT_SCOPE_UNIVERSE;
2638 if (ifa->scope&IFA_HOST)
2639 ifm->ifa_scope = RT_SCOPE_HOST;
2640 else if (ifa->scope&IFA_LINK)
2641 ifm->ifa_scope = RT_SCOPE_LINK;
2642 else if (ifa->scope&IFA_SITE)
2643 ifm->ifa_scope = RT_SCOPE_SITE;
2644 ifm->ifa_index = ifa->idev->dev->ifindex;
2645 RTA_PUT(skb, IFA_ADDRESS, 16, &ifa->addr);
2646 if (!(ifa->flags&IFA_F_PERMANENT)) {
2647 ci.ifa_prefered = ifa->prefered_lft;
2648 ci.ifa_valid = ifa->valid_lft;
2649 if (ci.ifa_prefered != INFINITY_LIFE_TIME) {
2650 long tval = (jiffies - ifa->tstamp)/HZ;
2651 ci.ifa_prefered -= tval;
2652 if (ci.ifa_valid != INFINITY_LIFE_TIME)
2653 ci.ifa_valid -= tval;
2654 }
2655 } else {
2656 ci.ifa_prefered = INFINITY_LIFE_TIME;
2657 ci.ifa_valid = INFINITY_LIFE_TIME;
2658 }
2659 ci.cstamp = (__u32)(TIME_DELTA(ifa->cstamp, INITIAL_JIFFIES) / HZ * 100
2660 + TIME_DELTA(ifa->cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
2661 ci.tstamp = (__u32)(TIME_DELTA(ifa->tstamp, INITIAL_JIFFIES) / HZ * 100
2662 + TIME_DELTA(ifa->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
2663 RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci);
2664 nlh->nlmsg_len = skb->tail - b;
2665 return skb->len;
2666
2667 nlmsg_failure:
2668 rtattr_failure:
2669 skb_trim(skb, b - skb->data);
2670 return -1;
2671 }
2672
2673 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
2674 u32 pid, u32 seq, int event, u16 flags)
2675 {
2676 struct ifaddrmsg *ifm;
2677 struct nlmsghdr *nlh;
2678 struct ifa_cacheinfo ci;
2679 unsigned char *b = skb->tail;
2680
2681 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags);
2682 ifm = NLMSG_DATA(nlh);
2683 ifm->ifa_family = AF_INET6;
2684 ifm->ifa_prefixlen = 128;
2685 ifm->ifa_flags = IFA_F_PERMANENT;
2686 ifm->ifa_scope = RT_SCOPE_UNIVERSE;
2687 if (ipv6_addr_scope(&ifmca->mca_addr)&IFA_SITE)
2688 ifm->ifa_scope = RT_SCOPE_SITE;
2689 ifm->ifa_index = ifmca->idev->dev->ifindex;
2690 RTA_PUT(skb, IFA_MULTICAST, 16, &ifmca->mca_addr);
2691 ci.cstamp = (__u32)(TIME_DELTA(ifmca->mca_cstamp, INITIAL_JIFFIES) / HZ
2692 * 100 + TIME_DELTA(ifmca->mca_cstamp, INITIAL_JIFFIES) % HZ
2693 * 100 / HZ);
2694 ci.tstamp = (__u32)(TIME_DELTA(ifmca->mca_tstamp, INITIAL_JIFFIES) / HZ
2695 * 100 + TIME_DELTA(ifmca->mca_tstamp, INITIAL_JIFFIES) % HZ
2696 * 100 / HZ);
2697 ci.ifa_prefered = INFINITY_LIFE_TIME;
2698 ci.ifa_valid = INFINITY_LIFE_TIME;
2699 RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci);
2700 nlh->nlmsg_len = skb->tail - b;
2701 return skb->len;
2702
2703 nlmsg_failure:
2704 rtattr_failure:
2705 skb_trim(skb, b - skb->data);
2706 return -1;
2707 }
2708
2709 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
2710 u32 pid, u32 seq, int event, unsigned int flags)
2711 {
2712 struct ifaddrmsg *ifm;
2713 struct nlmsghdr *nlh;
2714 struct ifa_cacheinfo ci;
2715 unsigned char *b = skb->tail;
2716
2717 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags);
2718 ifm = NLMSG_DATA(nlh);
2719 ifm->ifa_family = AF_INET6;
2720 ifm->ifa_prefixlen = 128;
2721 ifm->ifa_flags = IFA_F_PERMANENT;
2722 ifm->ifa_scope = RT_SCOPE_UNIVERSE;
2723 if (ipv6_addr_scope(&ifaca->aca_addr)&IFA_SITE)
2724 ifm->ifa_scope = RT_SCOPE_SITE;
2725 ifm->ifa_index = ifaca->aca_idev->dev->ifindex;
2726 RTA_PUT(skb, IFA_ANYCAST, 16, &ifaca->aca_addr);
2727 ci.cstamp = (__u32)(TIME_DELTA(ifaca->aca_cstamp, INITIAL_JIFFIES) / HZ
2728 * 100 + TIME_DELTA(ifaca->aca_cstamp, INITIAL_JIFFIES) % HZ
2729 * 100 / HZ);
2730 ci.tstamp = (__u32)(TIME_DELTA(ifaca->aca_tstamp, INITIAL_JIFFIES) / HZ
2731 * 100 + TIME_DELTA(ifaca->aca_tstamp, INITIAL_JIFFIES) % HZ
2732 * 100 / HZ);
2733 ci.ifa_prefered = INFINITY_LIFE_TIME;
2734 ci.ifa_valid = INFINITY_LIFE_TIME;
2735 RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci);
2736 nlh->nlmsg_len = skb->tail - b;
2737 return skb->len;
2738
2739 nlmsg_failure:
2740 rtattr_failure:
2741 skb_trim(skb, b - skb->data);
2742 return -1;
2743 }
2744
2745 enum addr_type_t
2746 {
2747 UNICAST_ADDR,
2748 MULTICAST_ADDR,
2749 ANYCAST_ADDR,
2750 };
2751
2752 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
2753 enum addr_type_t type)
2754 {
2755 int idx, ip_idx;
2756 int s_idx, s_ip_idx;
2757 int err = 1;
2758 struct net_device *dev;
2759 struct inet6_dev *idev = NULL;
2760 struct inet6_ifaddr *ifa;
2761 struct ifmcaddr6 *ifmca;
2762 struct ifacaddr6 *ifaca;
2763
2764 s_idx = cb->args[0];
2765 s_ip_idx = ip_idx = cb->args[1];
2766 read_lock(&dev_base_lock);
2767
2768 for (dev = dev_base, idx = 0; dev; dev = dev->next, idx++) {
2769 if (idx < s_idx)
2770 continue;
2771 if (idx > s_idx)
2772 s_ip_idx = 0;
2773 ip_idx = 0;
2774 if ((idev = in6_dev_get(dev)) == NULL)
2775 continue;
2776 read_lock_bh(&idev->lock);
2777 switch (type) {
2778 case UNICAST_ADDR:
2779 /* unicast address incl. temp addr */
2780 for (ifa = idev->addr_list; ifa;
2781 ifa = ifa->if_next, ip_idx++) {
2782 if (ip_idx < s_ip_idx)
2783 continue;
2784 if ((err = inet6_fill_ifaddr(skb, ifa,
2785 NETLINK_CB(cb->skb).pid,
2786 cb->nlh->nlmsg_seq, RTM_NEWADDR,
2787 NLM_F_MULTI)) <= 0)
2788 goto done;
2789 }
2790 break;
2791 case MULTICAST_ADDR:
2792 /* multicast address */
2793 for (ifmca = idev->mc_list; ifmca;
2794 ifmca = ifmca->next, ip_idx++) {
2795 if (ip_idx < s_ip_idx)
2796 continue;
2797 if ((err = inet6_fill_ifmcaddr(skb, ifmca,
2798 NETLINK_CB(cb->skb).pid,
2799 cb->nlh->nlmsg_seq, RTM_GETMULTICAST,
2800 NLM_F_MULTI)) <= 0)
2801 goto done;
2802 }
2803 break;
2804 case ANYCAST_ADDR:
2805 /* anycast address */
2806 for (ifaca = idev->ac_list; ifaca;
2807 ifaca = ifaca->aca_next, ip_idx++) {
2808 if (ip_idx < s_ip_idx)
2809 continue;
2810 if ((err = inet6_fill_ifacaddr(skb, ifaca,
2811 NETLINK_CB(cb->skb).pid,
2812 cb->nlh->nlmsg_seq, RTM_GETANYCAST,
2813 NLM_F_MULTI)) <= 0)
2814 goto done;
2815 }
2816 break;
2817 default:
2818 break;
2819 }
2820 read_unlock_bh(&idev->lock);
2821 in6_dev_put(idev);
2822 }
2823 done:
2824 if (err <= 0) {
2825 read_unlock_bh(&idev->lock);
2826 in6_dev_put(idev);
2827 }
2828 read_unlock(&dev_base_lock);
2829 cb->args[0] = idx;
2830 cb->args[1] = ip_idx;
2831 return skb->len;
2832 }
2833
2834 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
2835 {
2836 enum addr_type_t type = UNICAST_ADDR;
2837 return inet6_dump_addr(skb, cb, type);
2838 }
2839
2840 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
2841 {
2842 enum addr_type_t type = MULTICAST_ADDR;
2843 return inet6_dump_addr(skb, cb, type);
2844 }
2845
2846
2847 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
2848 {
2849 enum addr_type_t type = ANYCAST_ADDR;
2850 return inet6_dump_addr(skb, cb, type);
2851 }
2852
2853 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
2854 {
2855 struct sk_buff *skb;
2856 int size = NLMSG_SPACE(sizeof(struct ifaddrmsg)+128);
2857
2858 skb = alloc_skb(size, GFP_ATOMIC);
2859 if (!skb) {
2860 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFADDR, ENOBUFS);
2861 return;
2862 }
2863 if (inet6_fill_ifaddr(skb, ifa, current->pid, 0, event, 0) < 0) {
2864 kfree_skb(skb);
2865 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFADDR, EINVAL);
2866 return;
2867 }
2868 NETLINK_CB(skb).dst_group = RTNLGRP_IPV6_IFADDR;
2869 netlink_broadcast(rtnl, skb, 0, RTNLGRP_IPV6_IFADDR, GFP_ATOMIC);
2870 }
2871
2872 static void inline ipv6_store_devconf(struct ipv6_devconf *cnf,
2873 __s32 *array, int bytes)
2874 {
2875 memset(array, 0, bytes);
2876 array[DEVCONF_FORWARDING] = cnf->forwarding;
2877 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
2878 array[DEVCONF_MTU6] = cnf->mtu6;
2879 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
2880 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
2881 array[DEVCONF_AUTOCONF] = cnf->autoconf;
2882 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
2883 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
2884 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
2885 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
2886 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
2887 #ifdef CONFIG_IPV6_PRIVACY
2888 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
2889 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
2890 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
2891 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
2892 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
2893 #endif
2894 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
2895 }
2896
2897 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
2898 u32 pid, u32 seq, int event, unsigned int flags)
2899 {
2900 struct net_device *dev = idev->dev;
2901 __s32 *array = NULL;
2902 struct ifinfomsg *r;
2903 struct nlmsghdr *nlh;
2904 unsigned char *b = skb->tail;
2905 struct rtattr *subattr;
2906 __u32 mtu = dev->mtu;
2907 struct ifla_cacheinfo ci;
2908
2909 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*r), flags);
2910 r = NLMSG_DATA(nlh);
2911 r->ifi_family = AF_INET6;
2912 r->__ifi_pad = 0;
2913 r->ifi_type = dev->type;
2914 r->ifi_index = dev->ifindex;
2915 r->ifi_flags = dev_get_flags(dev);
2916 r->ifi_change = 0;
2917
2918 RTA_PUT(skb, IFLA_IFNAME, strlen(dev->name)+1, dev->name);
2919
2920 if (dev->addr_len)
2921 RTA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
2922
2923 RTA_PUT(skb, IFLA_MTU, sizeof(mtu), &mtu);
2924 if (dev->ifindex != dev->iflink)
2925 RTA_PUT(skb, IFLA_LINK, sizeof(int), &dev->iflink);
2926
2927 subattr = (struct rtattr*)skb->tail;
2928
2929 RTA_PUT(skb, IFLA_PROTINFO, 0, NULL);
2930
2931 /* return the device flags */
2932 RTA_PUT(skb, IFLA_INET6_FLAGS, sizeof(__u32), &idev->if_flags);
2933
2934 /* return interface cacheinfo */
2935 ci.max_reasm_len = IPV6_MAXPLEN;
2936 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
2937 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
2938 ci.reachable_time = idev->nd_parms->reachable_time;
2939 ci.retrans_time = idev->nd_parms->retrans_time;
2940 RTA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
2941
2942 /* return the device sysctl params */
2943 if ((array = kmalloc(DEVCONF_MAX * sizeof(*array), GFP_ATOMIC)) == NULL)
2944 goto rtattr_failure;
2945 ipv6_store_devconf(&idev->cnf, array, DEVCONF_MAX * sizeof(*array));
2946 RTA_PUT(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(*array), array);
2947
2948 /* XXX - Statistics/MC not implemented */
2949 subattr->rta_len = skb->tail - (u8*)subattr;
2950
2951 nlh->nlmsg_len = skb->tail - b;
2952 kfree(array);
2953 return skb->len;
2954
2955 nlmsg_failure:
2956 rtattr_failure:
2957 if (array)
2958 kfree(array);
2959 skb_trim(skb, b - skb->data);
2960 return -1;
2961 }
2962
2963 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
2964 {
2965 int idx, err;
2966 int s_idx = cb->args[0];
2967 struct net_device *dev;
2968 struct inet6_dev *idev;
2969
2970 read_lock(&dev_base_lock);
2971 for (dev=dev_base, idx=0; dev; dev = dev->next, idx++) {
2972 if (idx < s_idx)
2973 continue;
2974 if ((idev = in6_dev_get(dev)) == NULL)
2975 continue;
2976 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
2977 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
2978 in6_dev_put(idev);
2979 if (err <= 0)
2980 break;
2981 }
2982 read_unlock(&dev_base_lock);
2983 cb->args[0] = idx;
2984
2985 return skb->len;
2986 }
2987
2988 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
2989 {
2990 struct sk_buff *skb;
2991 /* 128 bytes ?? */
2992 int size = NLMSG_SPACE(sizeof(struct ifinfomsg)+128);
2993
2994 skb = alloc_skb(size, GFP_ATOMIC);
2995 if (!skb) {
2996 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFINFO, ENOBUFS);
2997 return;
2998 }
2999 if (inet6_fill_ifinfo(skb, idev, current->pid, 0, event, 0) < 0) {
3000 kfree_skb(skb);
3001 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFINFO, EINVAL);
3002 return;
3003 }
3004 NETLINK_CB(skb).dst_group = RTNLGRP_IPV6_IFINFO;
3005 netlink_broadcast(rtnl, skb, 0, RTNLGRP_IPV6_IFINFO, GFP_ATOMIC);
3006 }
3007
3008 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
3009 struct prefix_info *pinfo, u32 pid, u32 seq,
3010 int event, unsigned int flags)
3011 {
3012 struct prefixmsg *pmsg;
3013 struct nlmsghdr *nlh;
3014 unsigned char *b = skb->tail;
3015 struct prefix_cacheinfo ci;
3016
3017 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*pmsg), flags);
3018 pmsg = NLMSG_DATA(nlh);
3019 pmsg->prefix_family = AF_INET6;
3020 pmsg->prefix_pad1 = 0;
3021 pmsg->prefix_pad2 = 0;
3022 pmsg->prefix_ifindex = idev->dev->ifindex;
3023 pmsg->prefix_len = pinfo->prefix_len;
3024 pmsg->prefix_type = pinfo->type;
3025 pmsg->prefix_pad3 = 0;
3026
3027 pmsg->prefix_flags = 0;
3028 if (pinfo->onlink)
3029 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3030 if (pinfo->autoconf)
3031 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3032
3033 RTA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
3034
3035 ci.preferred_time = ntohl(pinfo->prefered);
3036 ci.valid_time = ntohl(pinfo->valid);
3037 RTA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
3038
3039 nlh->nlmsg_len = skb->tail - b;
3040 return skb->len;
3041
3042 nlmsg_failure:
3043 rtattr_failure:
3044 skb_trim(skb, b - skb->data);
3045 return -1;
3046 }
3047
3048 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
3049 struct prefix_info *pinfo)
3050 {
3051 struct sk_buff *skb;
3052 int size = NLMSG_SPACE(sizeof(struct prefixmsg)+128);
3053
3054 skb = alloc_skb(size, GFP_ATOMIC);
3055 if (!skb) {
3056 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_PREFIX, ENOBUFS);
3057 return;
3058 }
3059 if (inet6_fill_prefix(skb, idev, pinfo, current->pid, 0, event, 0) < 0) {
3060 kfree_skb(skb);
3061 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_PREFIX, EINVAL);
3062 return;
3063 }
3064 NETLINK_CB(skb).dst_group = RTNLGRP_IPV6_PREFIX;
3065 netlink_broadcast(rtnl, skb, 0, RTNLGRP_IPV6_PREFIX, GFP_ATOMIC);
3066 }
3067
3068 static struct rtnetlink_link inet6_rtnetlink_table[RTM_NR_MSGTYPES] = {
3069 [RTM_GETLINK - RTM_BASE] = { .dumpit = inet6_dump_ifinfo, },
3070 [RTM_NEWADDR - RTM_BASE] = { .doit = inet6_rtm_newaddr, },
3071 [RTM_DELADDR - RTM_BASE] = { .doit = inet6_rtm_deladdr, },
3072 [RTM_GETADDR - RTM_BASE] = { .dumpit = inet6_dump_ifaddr, },
3073 [RTM_GETMULTICAST - RTM_BASE] = { .dumpit = inet6_dump_ifmcaddr, },
3074 [RTM_GETANYCAST - RTM_BASE] = { .dumpit = inet6_dump_ifacaddr, },
3075 [RTM_NEWROUTE - RTM_BASE] = { .doit = inet6_rtm_newroute, },
3076 [RTM_DELROUTE - RTM_BASE] = { .doit = inet6_rtm_delroute, },
3077 [RTM_GETROUTE - RTM_BASE] = { .doit = inet6_rtm_getroute,
3078 .dumpit = inet6_dump_fib, },
3079 };
3080
3081 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3082 {
3083 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3084
3085 switch (event) {
3086 case RTM_NEWADDR:
3087 dst_hold(&ifp->rt->u.dst);
3088 if (ip6_ins_rt(ifp->rt, NULL, NULL, NULL))
3089 dst_release(&ifp->rt->u.dst);
3090 if (ifp->idev->cnf.forwarding)
3091 addrconf_join_anycast(ifp);
3092 break;
3093 case RTM_DELADDR:
3094 if (ifp->idev->cnf.forwarding)
3095 addrconf_leave_anycast(ifp);
3096 addrconf_leave_solict(ifp->idev, &ifp->addr);
3097 dst_hold(&ifp->rt->u.dst);
3098 if (ip6_del_rt(ifp->rt, NULL, NULL, NULL))
3099 dst_free(&ifp->rt->u.dst);
3100 else
3101 dst_release(&ifp->rt->u.dst);
3102 break;
3103 }
3104 }
3105
3106 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3107 {
3108 read_lock_bh(&addrconf_lock);
3109 if (likely(ifp->idev->dead == 0))
3110 __ipv6_ifa_notify(event, ifp);
3111 read_unlock_bh(&addrconf_lock);
3112 }
3113
3114 #ifdef CONFIG_SYSCTL
3115
3116 static
3117 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3118 void __user *buffer, size_t *lenp, loff_t *ppos)
3119 {
3120 int *valp = ctl->data;
3121 int val = *valp;
3122 int ret;
3123
3124 ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3125
3126 if (write && valp != &ipv6_devconf_dflt.forwarding) {
3127 if (valp != &ipv6_devconf.forwarding) {
3128 if ((!*valp) ^ (!val)) {
3129 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
3130 if (idev == NULL)
3131 return ret;
3132 dev_forward_change(idev);
3133 }
3134 } else {
3135 ipv6_devconf_dflt.forwarding = ipv6_devconf.forwarding;
3136 addrconf_forward_change();
3137 }
3138 if (*valp)
3139 rt6_purge_dflt_routers();
3140 }
3141
3142 return ret;
3143 }
3144
3145 static int addrconf_sysctl_forward_strategy(ctl_table *table,
3146 int __user *name, int nlen,
3147 void __user *oldval,
3148 size_t __user *oldlenp,
3149 void __user *newval, size_t newlen,
3150 void **context)
3151 {
3152 int *valp = table->data;
3153 int new;
3154
3155 if (!newval || !newlen)
3156 return 0;
3157 if (newlen != sizeof(int))
3158 return -EINVAL;
3159 if (get_user(new, (int __user *)newval))
3160 return -EFAULT;
3161 if (new == *valp)
3162 return 0;
3163 if (oldval && oldlenp) {
3164 size_t len;
3165 if (get_user(len, oldlenp))
3166 return -EFAULT;
3167 if (len) {
3168 if (len > table->maxlen)
3169 len = table->maxlen;
3170 if (copy_to_user(oldval, valp, len))
3171 return -EFAULT;
3172 if (put_user(len, oldlenp))
3173 return -EFAULT;
3174 }
3175 }
3176
3177 if (valp != &ipv6_devconf_dflt.forwarding) {
3178 if (valp != &ipv6_devconf.forwarding) {
3179 struct inet6_dev *idev = (struct inet6_dev *)table->extra1;
3180 int changed;
3181 if (unlikely(idev == NULL))
3182 return -ENODEV;
3183 changed = (!*valp) ^ (!new);
3184 *valp = new;
3185 if (changed)
3186 dev_forward_change(idev);
3187 } else {
3188 *valp = new;
3189 addrconf_forward_change();
3190 }
3191
3192 if (*valp)
3193 rt6_purge_dflt_routers();
3194 } else
3195 *valp = new;
3196
3197 return 1;
3198 }
3199
3200 static struct addrconf_sysctl_table
3201 {
3202 struct ctl_table_header *sysctl_header;
3203 ctl_table addrconf_vars[__NET_IPV6_MAX];
3204 ctl_table addrconf_dev[2];
3205 ctl_table addrconf_conf_dir[2];
3206 ctl_table addrconf_proto_dir[2];
3207 ctl_table addrconf_root_dir[2];
3208 } addrconf_sysctl = {
3209 .sysctl_header = NULL,
3210 .addrconf_vars = {
3211 {
3212 .ctl_name = NET_IPV6_FORWARDING,
3213 .procname = "forwarding",
3214 .data = &ipv6_devconf.forwarding,
3215 .maxlen = sizeof(int),
3216 .mode = 0644,
3217 .proc_handler = &addrconf_sysctl_forward,
3218 .strategy = &addrconf_sysctl_forward_strategy,
3219 },
3220 {
3221 .ctl_name = NET_IPV6_HOP_LIMIT,
3222 .procname = "hop_limit",
3223 .data = &ipv6_devconf.hop_limit,
3224 .maxlen = sizeof(int),
3225 .mode = 0644,
3226 .proc_handler = proc_dointvec,
3227 },
3228 {
3229 .ctl_name = NET_IPV6_MTU,
3230 .procname = "mtu",
3231 .data = &ipv6_devconf.mtu6,
3232 .maxlen = sizeof(int),
3233 .mode = 0644,
3234 .proc_handler = &proc_dointvec,
3235 },
3236 {
3237 .ctl_name = NET_IPV6_ACCEPT_RA,
3238 .procname = "accept_ra",
3239 .data = &ipv6_devconf.accept_ra,
3240 .maxlen = sizeof(int),
3241 .mode = 0644,
3242 .proc_handler = &proc_dointvec,
3243 },
3244 {
3245 .ctl_name = NET_IPV6_ACCEPT_REDIRECTS,
3246 .procname = "accept_redirects",
3247 .data = &ipv6_devconf.accept_redirects,
3248 .maxlen = sizeof(int),
3249 .mode = 0644,
3250 .proc_handler = &proc_dointvec,
3251 },
3252 {
3253 .ctl_name = NET_IPV6_AUTOCONF,
3254 .procname = "autoconf",
3255 .data = &ipv6_devconf.autoconf,
3256 .maxlen = sizeof(int),
3257 .mode = 0644,
3258 .proc_handler = &proc_dointvec,
3259 },
3260 {
3261 .ctl_name = NET_IPV6_DAD_TRANSMITS,
3262 .procname = "dad_transmits",
3263 .data = &ipv6_devconf.dad_transmits,
3264 .maxlen = sizeof(int),
3265 .mode = 0644,
3266 .proc_handler = &proc_dointvec,
3267 },
3268 {
3269 .ctl_name = NET_IPV6_RTR_SOLICITS,
3270 .procname = "router_solicitations",
3271 .data = &ipv6_devconf.rtr_solicits,
3272 .maxlen = sizeof(int),
3273 .mode = 0644,
3274 .proc_handler = &proc_dointvec,
3275 },
3276 {
3277 .ctl_name = NET_IPV6_RTR_SOLICIT_INTERVAL,
3278 .procname = "router_solicitation_interval",
3279 .data = &ipv6_devconf.rtr_solicit_interval,
3280 .maxlen = sizeof(int),
3281 .mode = 0644,
3282 .proc_handler = &proc_dointvec_jiffies,
3283 .strategy = &sysctl_jiffies,
3284 },
3285 {
3286 .ctl_name = NET_IPV6_RTR_SOLICIT_DELAY,
3287 .procname = "router_solicitation_delay",
3288 .data = &ipv6_devconf.rtr_solicit_delay,
3289 .maxlen = sizeof(int),
3290 .mode = 0644,
3291 .proc_handler = &proc_dointvec_jiffies,
3292 .strategy = &sysctl_jiffies,
3293 },
3294 {
3295 .ctl_name = NET_IPV6_FORCE_MLD_VERSION,
3296 .procname = "force_mld_version",
3297 .data = &ipv6_devconf.force_mld_version,
3298 .maxlen = sizeof(int),
3299 .mode = 0644,
3300 .proc_handler = &proc_dointvec,
3301 },
3302 #ifdef CONFIG_IPV6_PRIVACY
3303 {
3304 .ctl_name = NET_IPV6_USE_TEMPADDR,
3305 .procname = "use_tempaddr",
3306 .data = &ipv6_devconf.use_tempaddr,
3307 .maxlen = sizeof(int),
3308 .mode = 0644,
3309 .proc_handler = &proc_dointvec,
3310 },
3311 {
3312 .ctl_name = NET_IPV6_TEMP_VALID_LFT,
3313 .procname = "temp_valid_lft",
3314 .data = &ipv6_devconf.temp_valid_lft,
3315 .maxlen = sizeof(int),
3316 .mode = 0644,
3317 .proc_handler = &proc_dointvec,
3318 },
3319 {
3320 .ctl_name = NET_IPV6_TEMP_PREFERED_LFT,
3321 .procname = "temp_prefered_lft",
3322 .data = &ipv6_devconf.temp_prefered_lft,
3323 .maxlen = sizeof(int),
3324 .mode = 0644,
3325 .proc_handler = &proc_dointvec,
3326 },
3327 {
3328 .ctl_name = NET_IPV6_REGEN_MAX_RETRY,
3329 .procname = "regen_max_retry",
3330 .data = &ipv6_devconf.regen_max_retry,
3331 .maxlen = sizeof(int),
3332 .mode = 0644,
3333 .proc_handler = &proc_dointvec,
3334 },
3335 {
3336 .ctl_name = NET_IPV6_MAX_DESYNC_FACTOR,
3337 .procname = "max_desync_factor",
3338 .data = &ipv6_devconf.max_desync_factor,
3339 .maxlen = sizeof(int),
3340 .mode = 0644,
3341 .proc_handler = &proc_dointvec,
3342 },
3343 #endif
3344 {
3345 .ctl_name = NET_IPV6_MAX_ADDRESSES,
3346 .procname = "max_addresses",
3347 .data = &ipv6_devconf.max_addresses,
3348 .maxlen = sizeof(int),
3349 .mode = 0644,
3350 .proc_handler = &proc_dointvec,
3351 },
3352 {
3353 .ctl_name = 0, /* sentinel */
3354 }
3355 },
3356 .addrconf_dev = {
3357 {
3358 .ctl_name = NET_PROTO_CONF_ALL,
3359 .procname = "all",
3360 .mode = 0555,
3361 .child = addrconf_sysctl.addrconf_vars,
3362 },
3363 {
3364 .ctl_name = 0, /* sentinel */
3365 }
3366 },
3367 .addrconf_conf_dir = {
3368 {
3369 .ctl_name = NET_IPV6_CONF,
3370 .procname = "conf",
3371 .mode = 0555,
3372 .child = addrconf_sysctl.addrconf_dev,
3373 },
3374 {
3375 .ctl_name = 0, /* sentinel */
3376 }
3377 },
3378 .addrconf_proto_dir = {
3379 {
3380 .ctl_name = NET_IPV6,
3381 .procname = "ipv6",
3382 .mode = 0555,
3383 .child = addrconf_sysctl.addrconf_conf_dir,
3384 },
3385 {
3386 .ctl_name = 0, /* sentinel */
3387 }
3388 },
3389 .addrconf_root_dir = {
3390 {
3391 .ctl_name = CTL_NET,
3392 .procname = "net",
3393 .mode = 0555,
3394 .child = addrconf_sysctl.addrconf_proto_dir,
3395 },
3396 {
3397 .ctl_name = 0, /* sentinel */
3398 }
3399 },
3400 };
3401
3402 static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p)
3403 {
3404 int i;
3405 struct net_device *dev = idev ? idev->dev : NULL;
3406 struct addrconf_sysctl_table *t;
3407 char *dev_name = NULL;
3408
3409 t = kmalloc(sizeof(*t), GFP_KERNEL);
3410 if (t == NULL)
3411 return;
3412 memcpy(t, &addrconf_sysctl, sizeof(*t));
3413 for (i=0; t->addrconf_vars[i].data; i++) {
3414 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
3415 t->addrconf_vars[i].de = NULL;
3416 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
3417 }
3418 if (dev) {
3419 dev_name = dev->name;
3420 t->addrconf_dev[0].ctl_name = dev->ifindex;
3421 } else {
3422 dev_name = "default";
3423 t->addrconf_dev[0].ctl_name = NET_PROTO_CONF_DEFAULT;
3424 }
3425
3426 /*
3427 * Make a copy of dev_name, because '.procname' is regarded as const
3428 * by sysctl and we wouldn't want anyone to change it under our feet
3429 * (see SIOCSIFNAME).
3430 */
3431 dev_name = kstrdup(dev_name, GFP_KERNEL);
3432 if (!dev_name)
3433 goto free;
3434
3435 t->addrconf_dev[0].procname = dev_name;
3436
3437 t->addrconf_dev[0].child = t->addrconf_vars;
3438 t->addrconf_dev[0].de = NULL;
3439 t->addrconf_conf_dir[0].child = t->addrconf_dev;
3440 t->addrconf_conf_dir[0].de = NULL;
3441 t->addrconf_proto_dir[0].child = t->addrconf_conf_dir;
3442 t->addrconf_proto_dir[0].de = NULL;
3443 t->addrconf_root_dir[0].child = t->addrconf_proto_dir;
3444 t->addrconf_root_dir[0].de = NULL;
3445
3446 t->sysctl_header = register_sysctl_table(t->addrconf_root_dir, 0);
3447 if (t->sysctl_header == NULL)
3448 goto free_procname;
3449 else
3450 p->sysctl = t;
3451 return;
3452
3453 /* error path */
3454 free_procname:
3455 kfree(dev_name);
3456 free:
3457 kfree(t);
3458
3459 return;
3460 }
3461
3462 static void addrconf_sysctl_unregister(struct ipv6_devconf *p)
3463 {
3464 if (p->sysctl) {
3465 struct addrconf_sysctl_table *t = p->sysctl;
3466 p->sysctl = NULL;
3467 unregister_sysctl_table(t->sysctl_header);
3468 kfree(t->addrconf_dev[0].procname);
3469 kfree(t);
3470 }
3471 }
3472
3473
3474 #endif
3475
3476 /*
3477 * Device notifier
3478 */
3479
3480 int register_inet6addr_notifier(struct notifier_block *nb)
3481 {
3482 return notifier_chain_register(&inet6addr_chain, nb);
3483 }
3484
3485 int unregister_inet6addr_notifier(struct notifier_block *nb)
3486 {
3487 return notifier_chain_unregister(&inet6addr_chain,nb);
3488 }
3489
3490 /*
3491 * Init / cleanup code
3492 */
3493
3494 int __init addrconf_init(void)
3495 {
3496 int err = 0;
3497
3498 /* The addrconf netdev notifier requires that loopback_dev
3499 * has it's ipv6 private information allocated and setup
3500 * before it can bring up and give link-local addresses
3501 * to other devices which are up.
3502 *
3503 * Unfortunately, loopback_dev is not necessarily the first
3504 * entry in the global dev_base list of net devices. In fact,
3505 * it is likely to be the very last entry on that list.
3506 * So this causes the notifier registry below to try and
3507 * give link-local addresses to all devices besides loopback_dev
3508 * first, then loopback_dev, which cases all the non-loopback_dev
3509 * devices to fail to get a link-local address.
3510 *
3511 * So, as a temporary fix, allocate the ipv6 structure for
3512 * loopback_dev first by hand.
3513 * Longer term, all of the dependencies ipv6 has upon the loopback
3514 * device and it being up should be removed.
3515 */
3516 rtnl_lock();
3517 if (!ipv6_add_dev(&loopback_dev))
3518 err = -ENOMEM;
3519 rtnl_unlock();
3520 if (err)
3521 return err;
3522
3523 ip6_null_entry.rt6i_idev = in6_dev_get(&loopback_dev);
3524
3525 register_netdevice_notifier(&ipv6_dev_notf);
3526
3527 #ifdef CONFIG_IPV6_PRIVACY
3528 md5_tfm = crypto_alloc_tfm("md5", 0);
3529 if (unlikely(md5_tfm == NULL))
3530 printk(KERN_WARNING
3531 "failed to load transform for md5\n");
3532 #endif
3533
3534 addrconf_verify(0);
3535 rtnetlink_links[PF_INET6] = inet6_rtnetlink_table;
3536 #ifdef CONFIG_SYSCTL
3537 addrconf_sysctl.sysctl_header =
3538 register_sysctl_table(addrconf_sysctl.addrconf_root_dir, 0);
3539 addrconf_sysctl_register(NULL, &ipv6_devconf_dflt);
3540 #endif
3541
3542 return 0;
3543 }
3544
3545 void __exit addrconf_cleanup(void)
3546 {
3547 struct net_device *dev;
3548 struct inet6_dev *idev;
3549 struct inet6_ifaddr *ifa;
3550 int i;
3551
3552 unregister_netdevice_notifier(&ipv6_dev_notf);
3553
3554 rtnetlink_links[PF_INET6] = NULL;
3555 #ifdef CONFIG_SYSCTL
3556 addrconf_sysctl_unregister(&ipv6_devconf_dflt);
3557 addrconf_sysctl_unregister(&ipv6_devconf);
3558 #endif
3559
3560 rtnl_lock();
3561
3562 /*
3563 * clean dev list.
3564 */
3565
3566 for (dev=dev_base; dev; dev=dev->next) {
3567 if ((idev = __in6_dev_get(dev)) == NULL)
3568 continue;
3569 addrconf_ifdown(dev, 1);
3570 }
3571 addrconf_ifdown(&loopback_dev, 2);
3572
3573 /*
3574 * Check hash table.
3575 */
3576
3577 write_lock_bh(&addrconf_hash_lock);
3578 for (i=0; i < IN6_ADDR_HSIZE; i++) {
3579 for (ifa=inet6_addr_lst[i]; ifa; ) {
3580 struct inet6_ifaddr *bifa;
3581
3582 bifa = ifa;
3583 ifa = ifa->lst_next;
3584 printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
3585 /* Do not free it; something is wrong.
3586 Now we can investigate it with debugger.
3587 */
3588 }
3589 }
3590 write_unlock_bh(&addrconf_hash_lock);
3591
3592 del_timer(&addr_chk_timer);
3593
3594 rtnl_unlock();
3595
3596 #ifdef CONFIG_IPV6_PRIVACY
3597 crypto_free_tfm(md5_tfm);
3598 md5_tfm = NULL;
3599 #endif
3600
3601 #ifdef CONFIG_PROC_FS
3602 proc_net_remove("if_inet6");
3603 #endif
3604 }
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