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Linux 2.6.17.7
[linux/fpc-iii.git] / net / ipv6 / addrconf.c
blob4da664538f5204dd47f0299ada575435d719a3ca
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/capability.h>
62 #include <linux/delay.h>
63 #include <linux/notifier.h>
64 #include <linux/string.h>
65
66 #include <net/sock.h>
67 #include <net/snmp.h>
68
69 #include <net/ipv6.h>
70 #include <net/protocol.h>
71 #include <net/ndisc.h>
72 #include <net/ip6_route.h>
73 #include <net/addrconf.h>
74 #include <net/tcp.h>
75 #include <net/ip.h>
76 #include <linux/if_tunnel.h>
77 #include <linux/rtnetlink.h>
78
79 #ifdef CONFIG_IPV6_PRIVACY
80 #include <linux/random.h>
81 #endif
82
83 #include <asm/uaccess.h>
84
85 #include <linux/proc_fs.h>
86 #include <linux/seq_file.h>
87
88 /* Set to 3 to get tracing... */
89 #define ACONF_DEBUG 2
90
91 #if ACONF_DEBUG >= 3
92 #define ADBG(x) printk x
93 #else
94 #define ADBG(x)
95 #endif
96
97 #define INFINITY_LIFE_TIME 0xFFFFFFFF
98 #define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b)))
99
100 #ifdef CONFIG_SYSCTL
101 static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p);
102 static void addrconf_sysctl_unregister(struct ipv6_devconf *p);
103 #endif
104
105 #ifdef CONFIG_IPV6_PRIVACY
106 static int __ipv6_regen_rndid(struct inet6_dev *idev);
107 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
108 static void ipv6_regen_rndid(unsigned long data);
109
110 static int desync_factor = MAX_DESYNC_FACTOR * HZ;
111 #endif
112
113 static int ipv6_count_addresses(struct inet6_dev *idev);
114
115 /*
116 * Configured unicast address hash table
117 */
118 static struct inet6_ifaddr *inet6_addr_lst[IN6_ADDR_HSIZE];
119 static DEFINE_RWLOCK(addrconf_hash_lock);
120
121 /* Protects inet6 devices */
122 DEFINE_RWLOCK(addrconf_lock);
123
124 static void addrconf_verify(unsigned long);
125
126 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
127 static DEFINE_SPINLOCK(addrconf_verify_lock);
128
129 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
130 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
131
132 static int addrconf_ifdown(struct net_device *dev, int how);
133
134 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
135 static void addrconf_dad_timer(unsigned long data);
136 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
137 static void addrconf_dad_run(struct inet6_dev *idev);
138 static void addrconf_rs_timer(unsigned long data);
139 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
140 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
141
142 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
143 struct prefix_info *pinfo);
144 static int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev);
145
146 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
147
148 struct ipv6_devconf ipv6_devconf = {
149 .forwarding = 0,
150 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
151 .mtu6 = IPV6_MIN_MTU,
152 .accept_ra = 1,
153 .accept_redirects = 1,
154 .autoconf = 1,
155 .force_mld_version = 0,
156 .dad_transmits = 1,
157 .rtr_solicits = MAX_RTR_SOLICITATIONS,
158 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
159 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
160 #ifdef CONFIG_IPV6_PRIVACY
161 .use_tempaddr = 0,
162 .temp_valid_lft = TEMP_VALID_LIFETIME,
163 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
164 .regen_max_retry = REGEN_MAX_RETRY,
165 .max_desync_factor = MAX_DESYNC_FACTOR,
166 #endif
167 .max_addresses = IPV6_MAX_ADDRESSES,
168 .accept_ra_defrtr = 1,
169 .accept_ra_pinfo = 1,
170 #ifdef CONFIG_IPV6_ROUTER_PREF
171 .accept_ra_rtr_pref = 1,
172 .rtr_probe_interval = 60 * HZ,
173 #ifdef CONFIG_IPV6_ROUTE_INFO
174 .accept_ra_rt_info_max_plen = 0,
175 #endif
176 #endif
177 };
178
179 static struct ipv6_devconf ipv6_devconf_dflt = {
180 .forwarding = 0,
181 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
182 .mtu6 = IPV6_MIN_MTU,
183 .accept_ra = 1,
184 .accept_redirects = 1,
185 .autoconf = 1,
186 .dad_transmits = 1,
187 .rtr_solicits = MAX_RTR_SOLICITATIONS,
188 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
189 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
190 #ifdef CONFIG_IPV6_PRIVACY
191 .use_tempaddr = 0,
192 .temp_valid_lft = TEMP_VALID_LIFETIME,
193 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
194 .regen_max_retry = REGEN_MAX_RETRY,
195 .max_desync_factor = MAX_DESYNC_FACTOR,
196 #endif
197 .max_addresses = IPV6_MAX_ADDRESSES,
198 .accept_ra_defrtr = 1,
199 .accept_ra_pinfo = 1,
200 #ifdef CONFIG_IPV6_ROUTER_PREF
201 .accept_ra_rtr_pref = 1,
202 .rtr_probe_interval = 60 * HZ,
203 #ifdef CONFIG_IPV6_ROUTE_INFO
204 .accept_ra_rt_info_max_plen = 0,
205 #endif
206 #endif
207 };
208
209 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
210 #if 0
211 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
212 #endif
213 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
214
215 #define IPV6_ADDR_SCOPE_TYPE(scope) ((scope) << 16)
216
217 static inline unsigned ipv6_addr_scope2type(unsigned scope)
218 {
219 switch(scope) {
220 case IPV6_ADDR_SCOPE_NODELOCAL:
221 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_NODELOCAL) |
222 IPV6_ADDR_LOOPBACK);
223 case IPV6_ADDR_SCOPE_LINKLOCAL:
224 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL) |
225 IPV6_ADDR_LINKLOCAL);
226 case IPV6_ADDR_SCOPE_SITELOCAL:
227 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_SITELOCAL) |
228 IPV6_ADDR_SITELOCAL);
229 }
230 return IPV6_ADDR_SCOPE_TYPE(scope);
231 }
232
233 int __ipv6_addr_type(const struct in6_addr *addr)
234 {
235 u32 st;
236
237 st = addr->s6_addr32[0];
238
239 /* Consider all addresses with the first three bits different of
240 000 and 111 as unicasts.
241 */
242 if ((st & htonl(0xE0000000)) != htonl(0x00000000) &&
243 (st & htonl(0xE0000000)) != htonl(0xE0000000))
244 return (IPV6_ADDR_UNICAST |
245 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));
246
247 if ((st & htonl(0xFF000000)) == htonl(0xFF000000)) {
248 /* multicast */
249 /* addr-select 3.1 */
250 return (IPV6_ADDR_MULTICAST |
251 ipv6_addr_scope2type(IPV6_ADDR_MC_SCOPE(addr)));
252 }
253
254 if ((st & htonl(0xFFC00000)) == htonl(0xFE800000))
255 return (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_UNICAST |
256 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL)); /* addr-select 3.1 */
257 if ((st & htonl(0xFFC00000)) == htonl(0xFEC00000))
258 return (IPV6_ADDR_SITELOCAL | IPV6_ADDR_UNICAST |
259 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_SITELOCAL)); /* addr-select 3.1 */
260
261 if ((addr->s6_addr32[0] | addr->s6_addr32[1]) == 0) {
262 if (addr->s6_addr32[2] == 0) {
263 if (addr->s6_addr32[3] == 0)
264 return IPV6_ADDR_ANY;
265
266 if (addr->s6_addr32[3] == htonl(0x00000001))
267 return (IPV6_ADDR_LOOPBACK | IPV6_ADDR_UNICAST |
268 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL)); /* addr-select 3.4 */
269
270 return (IPV6_ADDR_COMPATv4 | IPV6_ADDR_UNICAST |
271 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* addr-select 3.3 */
272 }
273
274 if (addr->s6_addr32[2] == htonl(0x0000ffff))
275 return (IPV6_ADDR_MAPPED |
276 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* addr-select 3.3 */
277 }
278
279 return (IPV6_ADDR_RESERVED |
280 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* addr-select 3.4 */
281 }
282
283 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
284 {
285 if (del_timer(&ifp->timer))
286 __in6_ifa_put(ifp);
287 }
288
289 enum addrconf_timer_t
290 {
291 AC_NONE,
292 AC_DAD,
293 AC_RS,
294 };
295
296 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
297 enum addrconf_timer_t what,
298 unsigned long when)
299 {
300 if (!del_timer(&ifp->timer))
301 in6_ifa_hold(ifp);
302
303 switch (what) {
304 case AC_DAD:
305 ifp->timer.function = addrconf_dad_timer;
306 break;
307 case AC_RS:
308 ifp->timer.function = addrconf_rs_timer;
309 break;
310 default:;
311 }
312 ifp->timer.expires = jiffies + when;
313 add_timer(&ifp->timer);
314 }
315
316 /* Nobody refers to this device, we may destroy it. */
317
318 void in6_dev_finish_destroy(struct inet6_dev *idev)
319 {
320 struct net_device *dev = idev->dev;
321 BUG_TRAP(idev->addr_list==NULL);
322 BUG_TRAP(idev->mc_list==NULL);
323 #ifdef NET_REFCNT_DEBUG
324 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
325 #endif
326 dev_put(dev);
327 if (!idev->dead) {
328 printk("Freeing alive inet6 device %p\n", idev);
329 return;
330 }
331 snmp6_free_dev(idev);
332 kfree(idev);
333 }
334
335 static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
336 {
337 struct inet6_dev *ndev;
338
339 ASSERT_RTNL();
340
341 if (dev->mtu < IPV6_MIN_MTU)
342 return NULL;
343
344 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
345
346 if (ndev == NULL)
347 return NULL;
348
349 rwlock_init(&ndev->lock);
350 ndev->dev = dev;
351 memcpy(&ndev->cnf, &ipv6_devconf_dflt, sizeof(ndev->cnf));
352 ndev->cnf.mtu6 = dev->mtu;
353 ndev->cnf.sysctl = NULL;
354 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
355 if (ndev->nd_parms == NULL) {
356 kfree(ndev);
357 return NULL;
358 }
359 /* We refer to the device */
360 dev_hold(dev);
361
362 if (snmp6_alloc_dev(ndev) < 0) {
363 ADBG((KERN_WARNING
364 "%s(): cannot allocate memory for statistics; dev=%s.\n",
365 __FUNCTION__, dev->name));
366 neigh_parms_release(&nd_tbl, ndev->nd_parms);
367 ndev->dead = 1;
368 in6_dev_finish_destroy(ndev);
369 return NULL;
370 }
371
372 if (snmp6_register_dev(ndev) < 0) {
373 ADBG((KERN_WARNING
374 "%s(): cannot create /proc/net/dev_snmp6/%s\n",
375 __FUNCTION__, dev->name));
376 neigh_parms_release(&nd_tbl, ndev->nd_parms);
377 ndev->dead = 1;
378 in6_dev_finish_destroy(ndev);
379 return NULL;
380 }
381
382 /* One reference from device. We must do this before
383 * we invoke __ipv6_regen_rndid().
384 */
385 in6_dev_hold(ndev);
386
387 #ifdef CONFIG_IPV6_PRIVACY
388 init_timer(&ndev->regen_timer);
389 ndev->regen_timer.function = ipv6_regen_rndid;
390 ndev->regen_timer.data = (unsigned long) ndev;
391 if ((dev->flags&IFF_LOOPBACK) ||
392 dev->type == ARPHRD_TUNNEL ||
393 dev->type == ARPHRD_NONE ||
394 dev->type == ARPHRD_SIT) {
395 printk(KERN_INFO
396 "%s: Disabled Privacy Extensions\n",
397 dev->name);
398 ndev->cnf.use_tempaddr = -1;
399 } else {
400 in6_dev_hold(ndev);
401 ipv6_regen_rndid((unsigned long) ndev);
402 }
403 #endif
404
405 if (netif_carrier_ok(dev))
406 ndev->if_flags |= IF_READY;
407
408 write_lock_bh(&addrconf_lock);
409 dev->ip6_ptr = ndev;
410 write_unlock_bh(&addrconf_lock);
411
412 ipv6_mc_init_dev(ndev);
413 ndev->tstamp = jiffies;
414 #ifdef CONFIG_SYSCTL
415 neigh_sysctl_register(dev, ndev->nd_parms, NET_IPV6,
416 NET_IPV6_NEIGH, "ipv6",
417 &ndisc_ifinfo_sysctl_change,
418 NULL);
419 addrconf_sysctl_register(ndev, &ndev->cnf);
420 #endif
421 return ndev;
422 }
423
424 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
425 {
426 struct inet6_dev *idev;
427
428 ASSERT_RTNL();
429
430 if ((idev = __in6_dev_get(dev)) == NULL) {
431 if ((idev = ipv6_add_dev(dev)) == NULL)
432 return NULL;
433 }
434
435 if (dev->flags&IFF_UP)
436 ipv6_mc_up(idev);
437 return idev;
438 }
439
440 #ifdef CONFIG_SYSCTL
441 static void dev_forward_change(struct inet6_dev *idev)
442 {
443 struct net_device *dev;
444 struct inet6_ifaddr *ifa;
445 struct in6_addr addr;
446
447 if (!idev)
448 return;
449 dev = idev->dev;
450 if (dev && (dev->flags & IFF_MULTICAST)) {
451 ipv6_addr_all_routers(&addr);
452
453 if (idev->cnf.forwarding)
454 ipv6_dev_mc_inc(dev, &addr);
455 else
456 ipv6_dev_mc_dec(dev, &addr);
457 }
458 for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
459 if (idev->cnf.forwarding)
460 addrconf_join_anycast(ifa);
461 else
462 addrconf_leave_anycast(ifa);
463 }
464 }
465
466
467 static void addrconf_forward_change(void)
468 {
469 struct net_device *dev;
470 struct inet6_dev *idev;
471
472 read_lock(&dev_base_lock);
473 for (dev=dev_base; dev; dev=dev->next) {
474 read_lock(&addrconf_lock);
475 idev = __in6_dev_get(dev);
476 if (idev) {
477 int changed = (!idev->cnf.forwarding) ^ (!ipv6_devconf.forwarding);
478 idev->cnf.forwarding = ipv6_devconf.forwarding;
479 if (changed)
480 dev_forward_change(idev);
481 }
482 read_unlock(&addrconf_lock);
483 }
484 read_unlock(&dev_base_lock);
485 }
486 #endif
487
488 /* Nobody refers to this ifaddr, destroy it */
489
490 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
491 {
492 BUG_TRAP(ifp->if_next==NULL);
493 BUG_TRAP(ifp->lst_next==NULL);
494 #ifdef NET_REFCNT_DEBUG
495 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
496 #endif
497
498 in6_dev_put(ifp->idev);
499
500 if (del_timer(&ifp->timer))
501 printk("Timer is still running, when freeing ifa=%p\n", ifp);
502
503 if (!ifp->dead) {
504 printk("Freeing alive inet6 address %p\n", ifp);
505 return;
506 }
507 dst_release(&ifp->rt->u.dst);
508
509 kfree(ifp);
510 }
511
512 /* On success it returns ifp with increased reference count */
513
514 static struct inet6_ifaddr *
515 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
516 int scope, u32 flags)
517 {
518 struct inet6_ifaddr *ifa = NULL;
519 struct rt6_info *rt;
520 int hash;
521 int err = 0;
522
523 read_lock_bh(&addrconf_lock);
524 if (idev->dead) {
525 err = -ENODEV; /*XXX*/
526 goto out2;
527 }
528
529 write_lock(&addrconf_hash_lock);
530
531 /* Ignore adding duplicate addresses on an interface */
532 if (ipv6_chk_same_addr(addr, idev->dev)) {
533 ADBG(("ipv6_add_addr: already assigned\n"));
534 err = -EEXIST;
535 goto out;
536 }
537
538 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
539
540 if (ifa == NULL) {
541 ADBG(("ipv6_add_addr: malloc failed\n"));
542 err = -ENOBUFS;
543 goto out;
544 }
545
546 rt = addrconf_dst_alloc(idev, addr, 0);
547 if (IS_ERR(rt)) {
548 err = PTR_ERR(rt);
549 goto out;
550 }
551
552 ipv6_addr_copy(&ifa->addr, addr);
553
554 spin_lock_init(&ifa->lock);
555 init_timer(&ifa->timer);
556 ifa->timer.data = (unsigned long) ifa;
557 ifa->scope = scope;
558 ifa->prefix_len = pfxlen;
559 ifa->flags = flags | IFA_F_TENTATIVE;
560 ifa->cstamp = ifa->tstamp = jiffies;
561
562 ifa->idev = idev;
563 in6_dev_hold(idev);
564 /* For caller */
565 in6_ifa_hold(ifa);
566
567 /* Add to big hash table */
568 hash = ipv6_addr_hash(addr);
569
570 ifa->lst_next = inet6_addr_lst[hash];
571 inet6_addr_lst[hash] = ifa;
572 in6_ifa_hold(ifa);
573 write_unlock(&addrconf_hash_lock);
574
575 write_lock(&idev->lock);
576 /* Add to inet6_dev unicast addr list. */
577 ifa->if_next = idev->addr_list;
578 idev->addr_list = ifa;
579
580 #ifdef CONFIG_IPV6_PRIVACY
581 if (ifa->flags&IFA_F_TEMPORARY) {
582 ifa->tmp_next = idev->tempaddr_list;
583 idev->tempaddr_list = ifa;
584 in6_ifa_hold(ifa);
585 }
586 #endif
587
588 ifa->rt = rt;
589
590 in6_ifa_hold(ifa);
591 write_unlock(&idev->lock);
592 out2:
593 read_unlock_bh(&addrconf_lock);
594
595 if (likely(err == 0))
596 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
597 else {
598 kfree(ifa);
599 ifa = ERR_PTR(err);
600 }
601
602 return ifa;
603 out:
604 write_unlock(&addrconf_hash_lock);
605 goto out2;
606 }
607
608 /* This function wants to get referenced ifp and releases it before return */
609
610 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
611 {
612 struct inet6_ifaddr *ifa, **ifap;
613 struct inet6_dev *idev = ifp->idev;
614 int hash;
615 int deleted = 0, onlink = 0;
616 unsigned long expires = jiffies;
617
618 hash = ipv6_addr_hash(&ifp->addr);
619
620 ifp->dead = 1;
621
622 write_lock_bh(&addrconf_hash_lock);
623 for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
624 ifap = &ifa->lst_next) {
625 if (ifa == ifp) {
626 *ifap = ifa->lst_next;
627 __in6_ifa_put(ifp);
628 ifa->lst_next = NULL;
629 break;
630 }
631 }
632 write_unlock_bh(&addrconf_hash_lock);
633
634 write_lock_bh(&idev->lock);
635 #ifdef CONFIG_IPV6_PRIVACY
636 if (ifp->flags&IFA_F_TEMPORARY) {
637 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
638 ifap = &ifa->tmp_next) {
639 if (ifa == ifp) {
640 *ifap = ifa->tmp_next;
641 if (ifp->ifpub) {
642 in6_ifa_put(ifp->ifpub);
643 ifp->ifpub = NULL;
644 }
645 __in6_ifa_put(ifp);
646 ifa->tmp_next = NULL;
647 break;
648 }
649 }
650 }
651 #endif
652
653 for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
654 if (ifa == ifp) {
655 *ifap = ifa->if_next;
656 __in6_ifa_put(ifp);
657 ifa->if_next = NULL;
658 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
659 break;
660 deleted = 1;
661 continue;
662 } else if (ifp->flags & IFA_F_PERMANENT) {
663 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
664 ifp->prefix_len)) {
665 if (ifa->flags & IFA_F_PERMANENT) {
666 onlink = 1;
667 if (deleted)
668 break;
669 } else {
670 unsigned long lifetime;
671
672 if (!onlink)
673 onlink = -1;
674
675 spin_lock(&ifa->lock);
676 lifetime = min_t(unsigned long,
677 ifa->valid_lft, 0x7fffffffUL/HZ);
678 if (time_before(expires,
679 ifa->tstamp + lifetime * HZ))
680 expires = ifa->tstamp + lifetime * HZ;
681 spin_unlock(&ifa->lock);
682 }
683 }
684 }
685 ifap = &ifa->if_next;
686 }
687 write_unlock_bh(&idev->lock);
688
689 ipv6_ifa_notify(RTM_DELADDR, ifp);
690
691 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
692
693 addrconf_del_timer(ifp);
694
695 /*
696 * Purge or update corresponding prefix
697 *
698 * 1) we don't purge prefix here if address was not permanent.
699 * prefix is managed by its own lifetime.
700 * 2) if there're no addresses, delete prefix.
701 * 3) if there're still other permanent address(es),
702 * corresponding prefix is still permanent.
703 * 4) otherwise, update prefix lifetime to the
704 * longest valid lifetime among the corresponding
705 * addresses on the device.
706 * Note: subsequent RA will update lifetime.
707 *
708 * --yoshfuji
709 */
710 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
711 struct in6_addr prefix;
712 struct rt6_info *rt;
713
714 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
715 rt = rt6_lookup(&prefix, NULL, ifp->idev->dev->ifindex, 1);
716
717 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
718 if (onlink == 0) {
719 ip6_del_rt(rt, NULL, NULL, NULL);
720 rt = NULL;
721 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
722 rt->rt6i_expires = expires;
723 rt->rt6i_flags |= RTF_EXPIRES;
724 }
725 }
726 dst_release(&rt->u.dst);
727 }
728
729 in6_ifa_put(ifp);
730 }
731
732 #ifdef CONFIG_IPV6_PRIVACY
733 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
734 {
735 struct inet6_dev *idev = ifp->idev;
736 struct in6_addr addr, *tmpaddr;
737 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
738 int tmp_plen;
739 int ret = 0;
740 int max_addresses;
741
742 write_lock(&idev->lock);
743 if (ift) {
744 spin_lock_bh(&ift->lock);
745 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
746 spin_unlock_bh(&ift->lock);
747 tmpaddr = &addr;
748 } else {
749 tmpaddr = NULL;
750 }
751 retry:
752 in6_dev_hold(idev);
753 if (idev->cnf.use_tempaddr <= 0) {
754 write_unlock(&idev->lock);
755 printk(KERN_INFO
756 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
757 in6_dev_put(idev);
758 ret = -1;
759 goto out;
760 }
761 spin_lock_bh(&ifp->lock);
762 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
763 idev->cnf.use_tempaddr = -1; /*XXX*/
764 spin_unlock_bh(&ifp->lock);
765 write_unlock(&idev->lock);
766 printk(KERN_WARNING
767 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
768 in6_dev_put(idev);
769 ret = -1;
770 goto out;
771 }
772 in6_ifa_hold(ifp);
773 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
774 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
775 spin_unlock_bh(&ifp->lock);
776 write_unlock(&idev->lock);
777 printk(KERN_WARNING
778 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
779 in6_ifa_put(ifp);
780 in6_dev_put(idev);
781 ret = -1;
782 goto out;
783 }
784 memcpy(&addr.s6_addr[8], idev->rndid, 8);
785 tmp_valid_lft = min_t(__u32,
786 ifp->valid_lft,
787 idev->cnf.temp_valid_lft);
788 tmp_prefered_lft = min_t(__u32,
789 ifp->prefered_lft,
790 idev->cnf.temp_prefered_lft - desync_factor / HZ);
791 tmp_plen = ifp->prefix_len;
792 max_addresses = idev->cnf.max_addresses;
793 tmp_cstamp = ifp->cstamp;
794 tmp_tstamp = ifp->tstamp;
795 spin_unlock_bh(&ifp->lock);
796
797 write_unlock(&idev->lock);
798 ift = !max_addresses ||
799 ipv6_count_addresses(idev) < max_addresses ?
800 ipv6_add_addr(idev, &addr, tmp_plen,
801 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK, IFA_F_TEMPORARY) : NULL;
802 if (!ift || IS_ERR(ift)) {
803 in6_ifa_put(ifp);
804 in6_dev_put(idev);
805 printk(KERN_INFO
806 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
807 tmpaddr = &addr;
808 write_lock(&idev->lock);
809 goto retry;
810 }
811
812 spin_lock_bh(&ift->lock);
813 ift->ifpub = ifp;
814 ift->valid_lft = tmp_valid_lft;
815 ift->prefered_lft = tmp_prefered_lft;
816 ift->cstamp = tmp_cstamp;
817 ift->tstamp = tmp_tstamp;
818 spin_unlock_bh(&ift->lock);
819
820 addrconf_dad_start(ift, 0);
821 in6_ifa_put(ift);
822 in6_dev_put(idev);
823 out:
824 return ret;
825 }
826 #endif
827
828 /*
829 * Choose an appropriate source address (RFC3484)
830 */
831 struct ipv6_saddr_score {
832 int addr_type;
833 unsigned int attrs;
834 int matchlen;
835 int scope;
836 unsigned int rule;
837 };
838
839 #define IPV6_SADDR_SCORE_LOCAL 0x0001
840 #define IPV6_SADDR_SCORE_PREFERRED 0x0004
841 #define IPV6_SADDR_SCORE_HOA 0x0008
842 #define IPV6_SADDR_SCORE_OIF 0x0010
843 #define IPV6_SADDR_SCORE_LABEL 0x0020
844 #define IPV6_SADDR_SCORE_PRIVACY 0x0040
845
846 static int inline ipv6_saddr_preferred(int type)
847 {
848 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
849 IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
850 return 1;
851 return 0;
852 }
853
854 /* static matching label */
855 static int inline ipv6_saddr_label(const struct in6_addr *addr, int type)
856 {
857 /*
858 * prefix (longest match) label
859 * -----------------------------
860 * ::1/128 0
861 * ::/0 1
862 * 2002::/16 2
863 * ::/96 3
864 * ::ffff:0:0/96 4
865 * fc00::/7 5
866 * 2001::/32 6
867 */
868 if (type & IPV6_ADDR_LOOPBACK)
869 return 0;
870 else if (type & IPV6_ADDR_COMPATv4)
871 return 3;
872 else if (type & IPV6_ADDR_MAPPED)
873 return 4;
874 else if (addr->s6_addr32[0] == htonl(0x20010000))
875 return 6;
876 else if (addr->s6_addr16[0] == htons(0x2002))
877 return 2;
878 else if ((addr->s6_addr[0] & 0xfe) == 0xfc)
879 return 5;
880 return 1;
881 }
882
883 int ipv6_dev_get_saddr(struct net_device *daddr_dev,
884 struct in6_addr *daddr, struct in6_addr *saddr)
885 {
886 struct ipv6_saddr_score hiscore;
887 struct inet6_ifaddr *ifa_result = NULL;
888 int daddr_type = __ipv6_addr_type(daddr);
889 int daddr_scope = __ipv6_addr_src_scope(daddr_type);
890 u32 daddr_label = ipv6_saddr_label(daddr, daddr_type);
891 struct net_device *dev;
892
893 memset(&hiscore, 0, sizeof(hiscore));
894
895 read_lock(&dev_base_lock);
896 read_lock(&addrconf_lock);
897
898 for (dev = dev_base; dev; dev=dev->next) {
899 struct inet6_dev *idev;
900 struct inet6_ifaddr *ifa;
901
902 /* Rule 0: Candidate Source Address (section 4)
903 * - multicast and link-local destination address,
904 * the set of candidate source address MUST only
905 * include addresses assigned to interfaces
906 * belonging to the same link as the outgoing
907 * interface.
908 * (- For site-local destination addresses, the
909 * set of candidate source addresses MUST only
910 * include addresses assigned to interfaces
911 * belonging to the same site as the outgoing
912 * interface.)
913 */
914 if ((daddr_type & IPV6_ADDR_MULTICAST ||
915 daddr_scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
916 daddr_dev && dev != daddr_dev)
917 continue;
918
919 idev = __in6_dev_get(dev);
920 if (!idev)
921 continue;
922
923 read_lock_bh(&idev->lock);
924 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
925 struct ipv6_saddr_score score;
926
927 score.addr_type = __ipv6_addr_type(&ifa->addr);
928
929 /* Rule 0:
930 * - Tentative Address (RFC2462 section 5.4)
931 * - A tentative address is not considered
932 * "assigned to an interface" in the traditional
933 * sense.
934 * - Candidate Source Address (section 4)
935 * - In any case, anycast addresses, multicast
936 * addresses, and the unspecified address MUST
937 * NOT be included in a candidate set.
938 */
939 if (ifa->flags & IFA_F_TENTATIVE)
940 continue;
941 if (unlikely(score.addr_type == IPV6_ADDR_ANY ||
942 score.addr_type & IPV6_ADDR_MULTICAST)) {
943 LIMIT_NETDEBUG(KERN_DEBUG
944 "ADDRCONF: unspecified / multicast address"
945 "assigned as unicast address on %s",
946 dev->name);
947 continue;
948 }
949
950 score.attrs = 0;
951 score.matchlen = 0;
952 score.scope = 0;
953 score.rule = 0;
954
955 if (ifa_result == NULL) {
956 /* record it if the first available entry */
957 goto record_it;
958 }
959
960 /* Rule 1: Prefer same address */
961 if (hiscore.rule < 1) {
962 if (ipv6_addr_equal(&ifa_result->addr, daddr))
963 hiscore.attrs |= IPV6_SADDR_SCORE_LOCAL;
964 hiscore.rule++;
965 }
966 if (ipv6_addr_equal(&ifa->addr, daddr)) {
967 score.attrs |= IPV6_SADDR_SCORE_LOCAL;
968 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)) {
969 score.rule = 1;
970 goto record_it;
971 }
972 } else {
973 if (hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)
974 continue;
975 }
976
977 /* Rule 2: Prefer appropriate scope */
978 if (hiscore.rule < 2) {
979 hiscore.scope = __ipv6_addr_src_scope(hiscore.addr_type);
980 hiscore.rule++;
981 }
982 score.scope = __ipv6_addr_src_scope(score.addr_type);
983 if (hiscore.scope < score.scope) {
984 if (hiscore.scope < daddr_scope) {
985 score.rule = 2;
986 goto record_it;
987 } else
988 continue;
989 } else if (score.scope < hiscore.scope) {
990 if (score.scope < daddr_scope)
991 continue;
992 else {
993 score.rule = 2;
994 goto record_it;
995 }
996 }
997
998 /* Rule 3: Avoid deprecated address */
999 if (hiscore.rule < 3) {
1000 if (ipv6_saddr_preferred(hiscore.addr_type) ||
1001 !(ifa_result->flags & IFA_F_DEPRECATED))
1002 hiscore.attrs |= IPV6_SADDR_SCORE_PREFERRED;
1003 hiscore.rule++;
1004 }
1005 if (ipv6_saddr_preferred(score.addr_type) ||
1006 !(ifa->flags & IFA_F_DEPRECATED)) {
1007 score.attrs |= IPV6_SADDR_SCORE_PREFERRED;
1008 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)) {
1009 score.rule = 3;
1010 goto record_it;
1011 }
1012 } else {
1013 if (hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)
1014 continue;
1015 }
1016
1017 /* Rule 4: Prefer home address -- not implemented yet */
1018 if (hiscore.rule < 4)
1019 hiscore.rule++;
1020
1021 /* Rule 5: Prefer outgoing interface */
1022 if (hiscore.rule < 5) {
1023 if (daddr_dev == NULL ||
1024 daddr_dev == ifa_result->idev->dev)
1025 hiscore.attrs |= IPV6_SADDR_SCORE_OIF;
1026 hiscore.rule++;
1027 }
1028 if (daddr_dev == NULL ||
1029 daddr_dev == ifa->idev->dev) {
1030 score.attrs |= IPV6_SADDR_SCORE_OIF;
1031 if (!(hiscore.attrs & IPV6_SADDR_SCORE_OIF)) {
1032 score.rule = 5;
1033 goto record_it;
1034 }
1035 } else {
1036 if (hiscore.attrs & IPV6_SADDR_SCORE_OIF)
1037 continue;
1038 }
1039
1040 /* Rule 6: Prefer matching label */
1041 if (hiscore.rule < 6) {
1042 if (ipv6_saddr_label(&ifa_result->addr, hiscore.addr_type) == daddr_label)
1043 hiscore.attrs |= IPV6_SADDR_SCORE_LABEL;
1044 hiscore.rule++;
1045 }
1046 if (ipv6_saddr_label(&ifa->addr, score.addr_type) == daddr_label) {
1047 score.attrs |= IPV6_SADDR_SCORE_LABEL;
1048 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LABEL)) {
1049 score.rule = 6;
1050 goto record_it;
1051 }
1052 } else {
1053 if (hiscore.attrs & IPV6_SADDR_SCORE_LABEL)
1054 continue;
1055 }
1056
1057 #ifdef CONFIG_IPV6_PRIVACY
1058 /* Rule 7: Prefer public address
1059 * Note: prefer temprary address if use_tempaddr >= 2
1060 */
1061 if (hiscore.rule < 7) {
1062 if ((!(ifa_result->flags & IFA_F_TEMPORARY)) ^
1063 (ifa_result->idev->cnf.use_tempaddr >= 2))
1064 hiscore.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1065 hiscore.rule++;
1066 }
1067 if ((!(ifa->flags & IFA_F_TEMPORARY)) ^
1068 (ifa->idev->cnf.use_tempaddr >= 2)) {
1069 score.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1070 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)) {
1071 score.rule = 7;
1072 goto record_it;
1073 }
1074 } else {
1075 if (hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)
1076 continue;
1077 }
1078 #else
1079 if (hiscore.rule < 7)
1080 hiscore.rule++;
1081 #endif
1082 /* Rule 8: Use longest matching prefix */
1083 if (hiscore.rule < 8) {
1084 hiscore.matchlen = ipv6_addr_diff(&ifa_result->addr, daddr);
1085 hiscore.rule++;
1086 }
1087 score.matchlen = ipv6_addr_diff(&ifa->addr, daddr);
1088 if (score.matchlen > hiscore.matchlen) {
1089 score.rule = 8;
1090 goto record_it;
1091 }
1092 #if 0
1093 else if (score.matchlen < hiscore.matchlen)
1094 continue;
1095 #endif
1096
1097 /* Final Rule: choose first available one */
1098 continue;
1099 record_it:
1100 if (ifa_result)
1101 in6_ifa_put(ifa_result);
1102 in6_ifa_hold(ifa);
1103 ifa_result = ifa;
1104 hiscore = score;
1105 }
1106 read_unlock_bh(&idev->lock);
1107 }
1108 read_unlock(&addrconf_lock);
1109 read_unlock(&dev_base_lock);
1110
1111 if (!ifa_result)
1112 return -EADDRNOTAVAIL;
1113
1114 ipv6_addr_copy(saddr, &ifa_result->addr);
1115 in6_ifa_put(ifa_result);
1116 return 0;
1117 }
1118
1119
1120 int ipv6_get_saddr(struct dst_entry *dst,
1121 struct in6_addr *daddr, struct in6_addr *saddr)
1122 {
1123 return ipv6_dev_get_saddr(dst ? ((struct rt6_info *)dst)->rt6i_idev->dev : NULL, daddr, saddr);
1124 }
1125
1126
1127 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr)
1128 {
1129 struct inet6_dev *idev;
1130 int err = -EADDRNOTAVAIL;
1131
1132 read_lock(&addrconf_lock);
1133 if ((idev = __in6_dev_get(dev)) != NULL) {
1134 struct inet6_ifaddr *ifp;
1135
1136 read_lock_bh(&idev->lock);
1137 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1138 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1139 ipv6_addr_copy(addr, &ifp->addr);
1140 err = 0;
1141 break;
1142 }
1143 }
1144 read_unlock_bh(&idev->lock);
1145 }
1146 read_unlock(&addrconf_lock);
1147 return err;
1148 }
1149
1150 static int ipv6_count_addresses(struct inet6_dev *idev)
1151 {
1152 int cnt = 0;
1153 struct inet6_ifaddr *ifp;
1154
1155 read_lock_bh(&idev->lock);
1156 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1157 cnt++;
1158 read_unlock_bh(&idev->lock);
1159 return cnt;
1160 }
1161
1162 int ipv6_chk_addr(struct in6_addr *addr, struct net_device *dev, int strict)
1163 {
1164 struct inet6_ifaddr * ifp;
1165 u8 hash = ipv6_addr_hash(addr);
1166
1167 read_lock_bh(&addrconf_hash_lock);
1168 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1169 if (ipv6_addr_equal(&ifp->addr, addr) &&
1170 !(ifp->flags&IFA_F_TENTATIVE)) {
1171 if (dev == NULL || ifp->idev->dev == dev ||
1172 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1173 break;
1174 }
1175 }
1176 read_unlock_bh(&addrconf_hash_lock);
1177 return ifp != NULL;
1178 }
1179
1180 static
1181 int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev)
1182 {
1183 struct inet6_ifaddr * ifp;
1184 u8 hash = ipv6_addr_hash(addr);
1185
1186 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1187 if (ipv6_addr_equal(&ifp->addr, addr)) {
1188 if (dev == NULL || ifp->idev->dev == dev)
1189 break;
1190 }
1191 }
1192 return ifp != NULL;
1193 }
1194
1195 struct inet6_ifaddr * ipv6_get_ifaddr(struct in6_addr *addr, struct net_device *dev, int strict)
1196 {
1197 struct inet6_ifaddr * ifp;
1198 u8 hash = ipv6_addr_hash(addr);
1199
1200 read_lock_bh(&addrconf_hash_lock);
1201 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1202 if (ipv6_addr_equal(&ifp->addr, addr)) {
1203 if (dev == NULL || ifp->idev->dev == dev ||
1204 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1205 in6_ifa_hold(ifp);
1206 break;
1207 }
1208 }
1209 }
1210 read_unlock_bh(&addrconf_hash_lock);
1211
1212 return ifp;
1213 }
1214
1215 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1216 {
1217 const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
1218 const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
1219 u32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
1220 u32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1221 int sk_ipv6only = ipv6_only_sock(sk);
1222 int sk2_ipv6only = inet_v6_ipv6only(sk2);
1223 int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1224 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1225
1226 if (!sk2_rcv_saddr && !sk_ipv6only)
1227 return 1;
1228
1229 if (addr_type2 == IPV6_ADDR_ANY &&
1230 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1231 return 1;
1232
1233 if (addr_type == IPV6_ADDR_ANY &&
1234 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1235 return 1;
1236
1237 if (sk2_rcv_saddr6 &&
1238 ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1239 return 1;
1240
1241 if (addr_type == IPV6_ADDR_MAPPED &&
1242 !sk2_ipv6only &&
1243 (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1244 return 1;
1245
1246 return 0;
1247 }
1248
1249 /* Gets referenced address, destroys ifaddr */
1250
1251 static void addrconf_dad_stop(struct inet6_ifaddr *ifp)
1252 {
1253 if (ifp->flags&IFA_F_PERMANENT) {
1254 spin_lock_bh(&ifp->lock);
1255 addrconf_del_timer(ifp);
1256 ifp->flags |= IFA_F_TENTATIVE;
1257 spin_unlock_bh(&ifp->lock);
1258 in6_ifa_put(ifp);
1259 #ifdef CONFIG_IPV6_PRIVACY
1260 } else if (ifp->flags&IFA_F_TEMPORARY) {
1261 struct inet6_ifaddr *ifpub;
1262 spin_lock_bh(&ifp->lock);
1263 ifpub = ifp->ifpub;
1264 if (ifpub) {
1265 in6_ifa_hold(ifpub);
1266 spin_unlock_bh(&ifp->lock);
1267 ipv6_create_tempaddr(ifpub, ifp);
1268 in6_ifa_put(ifpub);
1269 } else {
1270 spin_unlock_bh(&ifp->lock);
1271 }
1272 ipv6_del_addr(ifp);
1273 #endif
1274 } else
1275 ipv6_del_addr(ifp);
1276 }
1277
1278 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1279 {
1280 if (net_ratelimit())
1281 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1282 addrconf_dad_stop(ifp);
1283 }
1284
1285 /* Join to solicited addr multicast group. */
1286
1287 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1288 {
1289 struct in6_addr maddr;
1290
1291 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1292 return;
1293
1294 addrconf_addr_solict_mult(addr, &maddr);
1295 ipv6_dev_mc_inc(dev, &maddr);
1296 }
1297
1298 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1299 {
1300 struct in6_addr maddr;
1301
1302 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1303 return;
1304
1305 addrconf_addr_solict_mult(addr, &maddr);
1306 __ipv6_dev_mc_dec(idev, &maddr);
1307 }
1308
1309 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1310 {
1311 struct in6_addr addr;
1312 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1313 if (ipv6_addr_any(&addr))
1314 return;
1315 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1316 }
1317
1318 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1319 {
1320 struct in6_addr addr;
1321 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1322 if (ipv6_addr_any(&addr))
1323 return;
1324 __ipv6_dev_ac_dec(ifp->idev, &addr);
1325 }
1326
1327 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1328 {
1329 if (dev->addr_len != ETH_ALEN)
1330 return -1;
1331 memcpy(eui, dev->dev_addr, 3);
1332 memcpy(eui + 5, dev->dev_addr + 3, 3);
1333
1334 /*
1335 * The zSeries OSA network cards can be shared among various
1336 * OS instances, but the OSA cards have only one MAC address.
1337 * This leads to duplicate address conflicts in conjunction
1338 * with IPv6 if more than one instance uses the same card.
1339 *
1340 * The driver for these cards can deliver a unique 16-bit
1341 * identifier for each instance sharing the same card. It is
1342 * placed instead of 0xFFFE in the interface identifier. The
1343 * "u" bit of the interface identifier is not inverted in this
1344 * case. Hence the resulting interface identifier has local
1345 * scope according to RFC2373.
1346 */
1347 if (dev->dev_id) {
1348 eui[3] = (dev->dev_id >> 8) & 0xFF;
1349 eui[4] = dev->dev_id & 0xFF;
1350 } else {
1351 eui[3] = 0xFF;
1352 eui[4] = 0xFE;
1353 eui[0] ^= 2;
1354 }
1355 return 0;
1356 }
1357
1358 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1359 {
1360 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1361 if (dev->addr_len != ARCNET_ALEN)
1362 return -1;
1363 memset(eui, 0, 7);
1364 eui[7] = *(u8*)dev->dev_addr;
1365 return 0;
1366 }
1367
1368 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1369 {
1370 if (dev->addr_len != INFINIBAND_ALEN)
1371 return -1;
1372 memcpy(eui, dev->dev_addr + 12, 8);
1373 eui[0] |= 2;
1374 return 0;
1375 }
1376
1377 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1378 {
1379 switch (dev->type) {
1380 case ARPHRD_ETHER:
1381 case ARPHRD_FDDI:
1382 case ARPHRD_IEEE802_TR:
1383 return addrconf_ifid_eui48(eui, dev);
1384 case ARPHRD_ARCNET:
1385 return addrconf_ifid_arcnet(eui, dev);
1386 case ARPHRD_INFINIBAND:
1387 return addrconf_ifid_infiniband(eui, dev);
1388 }
1389 return -1;
1390 }
1391
1392 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1393 {
1394 int err = -1;
1395 struct inet6_ifaddr *ifp;
1396
1397 read_lock_bh(&idev->lock);
1398 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1399 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1400 memcpy(eui, ifp->addr.s6_addr+8, 8);
1401 err = 0;
1402 break;
1403 }
1404 }
1405 read_unlock_bh(&idev->lock);
1406 return err;
1407 }
1408
1409 #ifdef CONFIG_IPV6_PRIVACY
1410 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1411 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1412 {
1413 regen:
1414 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1415 idev->rndid[0] &= ~0x02;
1416
1417 /*
1418 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1419 * check if generated address is not inappropriate
1420 *
1421 * - Reserved subnet anycast (RFC 2526)
1422 * 11111101 11....11 1xxxxxxx
1423 * - ISATAP (draft-ietf-ngtrans-isatap-13.txt) 5.1
1424 * 00-00-5E-FE-xx-xx-xx-xx
1425 * - value 0
1426 * - XXX: already assigned to an address on the device
1427 */
1428 if (idev->rndid[0] == 0xfd &&
1429 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1430 (idev->rndid[7]&0x80))
1431 goto regen;
1432 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1433 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1434 goto regen;
1435 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1436 goto regen;
1437 }
1438
1439 return 0;
1440 }
1441
1442 static void ipv6_regen_rndid(unsigned long data)
1443 {
1444 struct inet6_dev *idev = (struct inet6_dev *) data;
1445 unsigned long expires;
1446
1447 read_lock_bh(&addrconf_lock);
1448 write_lock_bh(&idev->lock);
1449
1450 if (idev->dead)
1451 goto out;
1452
1453 if (__ipv6_regen_rndid(idev) < 0)
1454 goto out;
1455
1456 expires = jiffies +
1457 idev->cnf.temp_prefered_lft * HZ -
1458 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1459 if (time_before(expires, jiffies)) {
1460 printk(KERN_WARNING
1461 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1462 idev->dev->name);
1463 goto out;
1464 }
1465
1466 if (!mod_timer(&idev->regen_timer, expires))
1467 in6_dev_hold(idev);
1468
1469 out:
1470 write_unlock_bh(&idev->lock);
1471 read_unlock_bh(&addrconf_lock);
1472 in6_dev_put(idev);
1473 }
1474
1475 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1476 int ret = 0;
1477
1478 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1479 ret = __ipv6_regen_rndid(idev);
1480 return ret;
1481 }
1482 #endif
1483
1484 /*
1485 * Add prefix route.
1486 */
1487
1488 static void
1489 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1490 unsigned long expires, u32 flags)
1491 {
1492 struct in6_rtmsg rtmsg;
1493
1494 memset(&rtmsg, 0, sizeof(rtmsg));
1495 ipv6_addr_copy(&rtmsg.rtmsg_dst, pfx);
1496 rtmsg.rtmsg_dst_len = plen;
1497 rtmsg.rtmsg_metric = IP6_RT_PRIO_ADDRCONF;
1498 rtmsg.rtmsg_ifindex = dev->ifindex;
1499 rtmsg.rtmsg_info = expires;
1500 rtmsg.rtmsg_flags = RTF_UP|flags;
1501 rtmsg.rtmsg_type = RTMSG_NEWROUTE;
1502
1503 /* Prevent useless cloning on PtP SIT.
1504 This thing is done here expecting that the whole
1505 class of non-broadcast devices need not cloning.
1506 */
1507 if (dev->type == ARPHRD_SIT && (dev->flags&IFF_POINTOPOINT))
1508 rtmsg.rtmsg_flags |= RTF_NONEXTHOP;
1509
1510 ip6_route_add(&rtmsg, NULL, NULL, NULL);
1511 }
1512
1513 /* Create "default" multicast route to the interface */
1514
1515 static void addrconf_add_mroute(struct net_device *dev)
1516 {
1517 struct in6_rtmsg rtmsg;
1518
1519 memset(&rtmsg, 0, sizeof(rtmsg));
1520 ipv6_addr_set(&rtmsg.rtmsg_dst,
1521 htonl(0xFF000000), 0, 0, 0);
1522 rtmsg.rtmsg_dst_len = 8;
1523 rtmsg.rtmsg_metric = IP6_RT_PRIO_ADDRCONF;
1524 rtmsg.rtmsg_ifindex = dev->ifindex;
1525 rtmsg.rtmsg_flags = RTF_UP;
1526 rtmsg.rtmsg_type = RTMSG_NEWROUTE;
1527 ip6_route_add(&rtmsg, NULL, NULL, NULL);
1528 }
1529
1530 static void sit_route_add(struct net_device *dev)
1531 {
1532 struct in6_rtmsg rtmsg;
1533
1534 memset(&rtmsg, 0, sizeof(rtmsg));
1535
1536 rtmsg.rtmsg_type = RTMSG_NEWROUTE;
1537 rtmsg.rtmsg_metric = IP6_RT_PRIO_ADDRCONF;
1538
1539 /* prefix length - 96 bits "::d.d.d.d" */
1540 rtmsg.rtmsg_dst_len = 96;
1541 rtmsg.rtmsg_flags = RTF_UP|RTF_NONEXTHOP;
1542 rtmsg.rtmsg_ifindex = dev->ifindex;
1543
1544 ip6_route_add(&rtmsg, NULL, NULL, NULL);
1545 }
1546
1547 static void addrconf_add_lroute(struct net_device *dev)
1548 {
1549 struct in6_addr addr;
1550
1551 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1552 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1553 }
1554
1555 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1556 {
1557 struct inet6_dev *idev;
1558
1559 ASSERT_RTNL();
1560
1561 if ((idev = ipv6_find_idev(dev)) == NULL)
1562 return NULL;
1563
1564 /* Add default multicast route */
1565 addrconf_add_mroute(dev);
1566
1567 /* Add link local route */
1568 addrconf_add_lroute(dev);
1569 return idev;
1570 }
1571
1572 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1573 {
1574 struct prefix_info *pinfo;
1575 __u32 valid_lft;
1576 __u32 prefered_lft;
1577 int addr_type;
1578 unsigned long rt_expires;
1579 struct inet6_dev *in6_dev;
1580
1581 pinfo = (struct prefix_info *) opt;
1582
1583 if (len < sizeof(struct prefix_info)) {
1584 ADBG(("addrconf: prefix option too short\n"));
1585 return;
1586 }
1587
1588 /*
1589 * Validation checks ([ADDRCONF], page 19)
1590 */
1591
1592 addr_type = ipv6_addr_type(&pinfo->prefix);
1593
1594 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1595 return;
1596
1597 valid_lft = ntohl(pinfo->valid);
1598 prefered_lft = ntohl(pinfo->prefered);
1599
1600 if (prefered_lft > valid_lft) {
1601 if (net_ratelimit())
1602 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1603 return;
1604 }
1605
1606 in6_dev = in6_dev_get(dev);
1607
1608 if (in6_dev == NULL) {
1609 if (net_ratelimit())
1610 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1611 return;
1612 }
1613
1614 /*
1615 * Two things going on here:
1616 * 1) Add routes for on-link prefixes
1617 * 2) Configure prefixes with the auto flag set
1618 */
1619
1620 /* Avoid arithmetic overflow. Really, we could
1621 save rt_expires in seconds, likely valid_lft,
1622 but it would require division in fib gc, that it
1623 not good.
1624 */
1625 if (valid_lft >= 0x7FFFFFFF/HZ)
1626 rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ);
1627 else
1628 rt_expires = valid_lft * HZ;
1629
1630 /*
1631 * We convert this (in jiffies) to clock_t later.
1632 * Avoid arithmetic overflow there as well.
1633 * Overflow can happen only if HZ < USER_HZ.
1634 */
1635 if (HZ < USER_HZ && rt_expires > 0x7FFFFFFF / USER_HZ)
1636 rt_expires = 0x7FFFFFFF / USER_HZ;
1637
1638 if (pinfo->onlink) {
1639 struct rt6_info *rt;
1640 rt = rt6_lookup(&pinfo->prefix, NULL, dev->ifindex, 1);
1641
1642 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
1643 if (rt->rt6i_flags&RTF_EXPIRES) {
1644 if (valid_lft == 0) {
1645 ip6_del_rt(rt, NULL, NULL, NULL);
1646 rt = NULL;
1647 } else {
1648 rt->rt6i_expires = jiffies + rt_expires;
1649 }
1650 }
1651 } else if (valid_lft) {
1652 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1653 dev, jiffies_to_clock_t(rt_expires), RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT);
1654 }
1655 if (rt)
1656 dst_release(&rt->u.dst);
1657 }
1658
1659 /* Try to figure out our local address for this prefix */
1660
1661 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1662 struct inet6_ifaddr * ifp;
1663 struct in6_addr addr;
1664 int create = 0, update_lft = 0;
1665
1666 if (pinfo->prefix_len == 64) {
1667 memcpy(&addr, &pinfo->prefix, 8);
1668 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1669 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1670 in6_dev_put(in6_dev);
1671 return;
1672 }
1673 goto ok;
1674 }
1675 if (net_ratelimit())
1676 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1677 pinfo->prefix_len);
1678 in6_dev_put(in6_dev);
1679 return;
1680
1681 ok:
1682
1683 ifp = ipv6_get_ifaddr(&addr, dev, 1);
1684
1685 if (ifp == NULL && valid_lft) {
1686 int max_addresses = in6_dev->cnf.max_addresses;
1687
1688 /* Do not allow to create too much of autoconfigured
1689 * addresses; this would be too easy way to crash kernel.
1690 */
1691 if (!max_addresses ||
1692 ipv6_count_addresses(in6_dev) < max_addresses)
1693 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1694 addr_type&IPV6_ADDR_SCOPE_MASK, 0);
1695
1696 if (!ifp || IS_ERR(ifp)) {
1697 in6_dev_put(in6_dev);
1698 return;
1699 }
1700
1701 update_lft = create = 1;
1702 ifp->cstamp = jiffies;
1703 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1704 }
1705
1706 if (ifp) {
1707 int flags;
1708 unsigned long now;
1709 #ifdef CONFIG_IPV6_PRIVACY
1710 struct inet6_ifaddr *ift;
1711 #endif
1712 u32 stored_lft;
1713
1714 /* update lifetime (RFC2462 5.5.3 e) */
1715 spin_lock(&ifp->lock);
1716 now = jiffies;
1717 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1718 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1719 else
1720 stored_lft = 0;
1721 if (!update_lft && stored_lft) {
1722 if (valid_lft > MIN_VALID_LIFETIME ||
1723 valid_lft > stored_lft)
1724 update_lft = 1;
1725 else if (stored_lft <= MIN_VALID_LIFETIME) {
1726 /* valid_lft <= stored_lft is always true */
1727 /* XXX: IPsec */
1728 update_lft = 0;
1729 } else {
1730 valid_lft = MIN_VALID_LIFETIME;
1731 if (valid_lft < prefered_lft)
1732 prefered_lft = valid_lft;
1733 update_lft = 1;
1734 }
1735 }
1736
1737 if (update_lft) {
1738 ifp->valid_lft = valid_lft;
1739 ifp->prefered_lft = prefered_lft;
1740 ifp->tstamp = now;
1741 flags = ifp->flags;
1742 ifp->flags &= ~IFA_F_DEPRECATED;
1743 spin_unlock(&ifp->lock);
1744
1745 if (!(flags&IFA_F_TENTATIVE))
1746 ipv6_ifa_notify(0, ifp);
1747 } else
1748 spin_unlock(&ifp->lock);
1749
1750 #ifdef CONFIG_IPV6_PRIVACY
1751 read_lock_bh(&in6_dev->lock);
1752 /* update all temporary addresses in the list */
1753 for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1754 /*
1755 * When adjusting the lifetimes of an existing
1756 * temporary address, only lower the lifetimes.
1757 * Implementations must not increase the
1758 * lifetimes of an existing temporary address
1759 * when processing a Prefix Information Option.
1760 */
1761 spin_lock(&ift->lock);
1762 flags = ift->flags;
1763 if (ift->valid_lft > valid_lft &&
1764 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1765 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1766 if (ift->prefered_lft > prefered_lft &&
1767 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1768 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1769 spin_unlock(&ift->lock);
1770 if (!(flags&IFA_F_TENTATIVE))
1771 ipv6_ifa_notify(0, ift);
1772 }
1773
1774 if (create && in6_dev->cnf.use_tempaddr > 0) {
1775 /*
1776 * When a new public address is created as described in [ADDRCONF],
1777 * also create a new temporary address.
1778 */
1779 read_unlock_bh(&in6_dev->lock);
1780 ipv6_create_tempaddr(ifp, NULL);
1781 } else {
1782 read_unlock_bh(&in6_dev->lock);
1783 }
1784 #endif
1785 in6_ifa_put(ifp);
1786 addrconf_verify(0);
1787 }
1788 }
1789 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
1790 in6_dev_put(in6_dev);
1791 }
1792
1793 /*
1794 * Set destination address.
1795 * Special case for SIT interfaces where we create a new "virtual"
1796 * device.
1797 */
1798 int addrconf_set_dstaddr(void __user *arg)
1799 {
1800 struct in6_ifreq ireq;
1801 struct net_device *dev;
1802 int err = -EINVAL;
1803
1804 rtnl_lock();
1805
1806 err = -EFAULT;
1807 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1808 goto err_exit;
1809
1810 dev = __dev_get_by_index(ireq.ifr6_ifindex);
1811
1812 err = -ENODEV;
1813 if (dev == NULL)
1814 goto err_exit;
1815
1816 if (dev->type == ARPHRD_SIT) {
1817 struct ifreq ifr;
1818 mm_segment_t oldfs;
1819 struct ip_tunnel_parm p;
1820
1821 err = -EADDRNOTAVAIL;
1822 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
1823 goto err_exit;
1824
1825 memset(&p, 0, sizeof(p));
1826 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
1827 p.iph.saddr = 0;
1828 p.iph.version = 4;
1829 p.iph.ihl = 5;
1830 p.iph.protocol = IPPROTO_IPV6;
1831 p.iph.ttl = 64;
1832 ifr.ifr_ifru.ifru_data = (void __user *)&p;
1833
1834 oldfs = get_fs(); set_fs(KERNEL_DS);
1835 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
1836 set_fs(oldfs);
1837
1838 if (err == 0) {
1839 err = -ENOBUFS;
1840 if ((dev = __dev_get_by_name(p.name)) == NULL)
1841 goto err_exit;
1842 err = dev_open(dev);
1843 }
1844 }
1845
1846 err_exit:
1847 rtnl_unlock();
1848 return err;
1849 }
1850
1851 /*
1852 * Manual configuration of address on an interface
1853 */
1854 static int inet6_addr_add(int ifindex, struct in6_addr *pfx, int plen)
1855 {
1856 struct inet6_ifaddr *ifp;
1857 struct inet6_dev *idev;
1858 struct net_device *dev;
1859 int scope;
1860
1861 ASSERT_RTNL();
1862
1863 if ((dev = __dev_get_by_index(ifindex)) == NULL)
1864 return -ENODEV;
1865
1866 if (!(dev->flags&IFF_UP))
1867 return -ENETDOWN;
1868
1869 if ((idev = addrconf_add_dev(dev)) == NULL)
1870 return -ENOBUFS;
1871
1872 scope = ipv6_addr_scope(pfx);
1873
1874 ifp = ipv6_add_addr(idev, pfx, plen, scope, IFA_F_PERMANENT);
1875 if (!IS_ERR(ifp)) {
1876 addrconf_dad_start(ifp, 0);
1877 in6_ifa_put(ifp);
1878 return 0;
1879 }
1880
1881 return PTR_ERR(ifp);
1882 }
1883
1884 static int inet6_addr_del(int ifindex, struct in6_addr *pfx, int plen)
1885 {
1886 struct inet6_ifaddr *ifp;
1887 struct inet6_dev *idev;
1888 struct net_device *dev;
1889
1890 if ((dev = __dev_get_by_index(ifindex)) == NULL)
1891 return -ENODEV;
1892
1893 if ((idev = __in6_dev_get(dev)) == NULL)
1894 return -ENXIO;
1895
1896 read_lock_bh(&idev->lock);
1897 for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
1898 if (ifp->prefix_len == plen &&
1899 ipv6_addr_equal(pfx, &ifp->addr)) {
1900 in6_ifa_hold(ifp);
1901 read_unlock_bh(&idev->lock);
1902
1903 ipv6_del_addr(ifp);
1904
1905 /* If the last address is deleted administratively,
1906 disable IPv6 on this interface.
1907 */
1908 if (idev->addr_list == NULL)
1909 addrconf_ifdown(idev->dev, 1);
1910 return 0;
1911 }
1912 }
1913 read_unlock_bh(&idev->lock);
1914 return -EADDRNOTAVAIL;
1915 }
1916
1917
1918 int addrconf_add_ifaddr(void __user *arg)
1919 {
1920 struct in6_ifreq ireq;
1921 int err;
1922
1923 if (!capable(CAP_NET_ADMIN))
1924 return -EPERM;
1925
1926 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1927 return -EFAULT;
1928
1929 rtnl_lock();
1930 err = inet6_addr_add(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
1931 rtnl_unlock();
1932 return err;
1933 }
1934
1935 int addrconf_del_ifaddr(void __user *arg)
1936 {
1937 struct in6_ifreq ireq;
1938 int err;
1939
1940 if (!capable(CAP_NET_ADMIN))
1941 return -EPERM;
1942
1943 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1944 return -EFAULT;
1945
1946 rtnl_lock();
1947 err = inet6_addr_del(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
1948 rtnl_unlock();
1949 return err;
1950 }
1951
1952 static void sit_add_v4_addrs(struct inet6_dev *idev)
1953 {
1954 struct inet6_ifaddr * ifp;
1955 struct in6_addr addr;
1956 struct net_device *dev;
1957 int scope;
1958
1959 ASSERT_RTNL();
1960
1961 memset(&addr, 0, sizeof(struct in6_addr));
1962 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
1963
1964 if (idev->dev->flags&IFF_POINTOPOINT) {
1965 addr.s6_addr32[0] = htonl(0xfe800000);
1966 scope = IFA_LINK;
1967 } else {
1968 scope = IPV6_ADDR_COMPATv4;
1969 }
1970
1971 if (addr.s6_addr32[3]) {
1972 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
1973 if (!IS_ERR(ifp)) {
1974 spin_lock_bh(&ifp->lock);
1975 ifp->flags &= ~IFA_F_TENTATIVE;
1976 spin_unlock_bh(&ifp->lock);
1977 ipv6_ifa_notify(RTM_NEWADDR, ifp);
1978 in6_ifa_put(ifp);
1979 }
1980 return;
1981 }
1982
1983 for (dev = dev_base; dev != NULL; dev = dev->next) {
1984 struct in_device * in_dev = __in_dev_get_rtnl(dev);
1985 if (in_dev && (dev->flags & IFF_UP)) {
1986 struct in_ifaddr * ifa;
1987
1988 int flag = scope;
1989
1990 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1991 int plen;
1992
1993 addr.s6_addr32[3] = ifa->ifa_local;
1994
1995 if (ifa->ifa_scope == RT_SCOPE_LINK)
1996 continue;
1997 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
1998 if (idev->dev->flags&IFF_POINTOPOINT)
1999 continue;
2000 flag |= IFA_HOST;
2001 }
2002 if (idev->dev->flags&IFF_POINTOPOINT)
2003 plen = 64;
2004 else
2005 plen = 96;
2006
2007 ifp = ipv6_add_addr(idev, &addr, plen, flag,
2008 IFA_F_PERMANENT);
2009 if (!IS_ERR(ifp)) {
2010 spin_lock_bh(&ifp->lock);
2011 ifp->flags &= ~IFA_F_TENTATIVE;
2012 spin_unlock_bh(&ifp->lock);
2013 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2014 in6_ifa_put(ifp);
2015 }
2016 }
2017 }
2018 }
2019 }
2020
2021 static void init_loopback(struct net_device *dev)
2022 {
2023 struct inet6_dev *idev;
2024 struct inet6_ifaddr * ifp;
2025
2026 /* ::1 */
2027
2028 ASSERT_RTNL();
2029
2030 if ((idev = ipv6_find_idev(dev)) == NULL) {
2031 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2032 return;
2033 }
2034
2035 ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
2036 if (!IS_ERR(ifp)) {
2037 spin_lock_bh(&ifp->lock);
2038 ifp->flags &= ~IFA_F_TENTATIVE;
2039 spin_unlock_bh(&ifp->lock);
2040 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2041 in6_ifa_put(ifp);
2042 }
2043 }
2044
2045 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2046 {
2047 struct inet6_ifaddr * ifp;
2048
2049 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, IFA_F_PERMANENT);
2050 if (!IS_ERR(ifp)) {
2051 addrconf_dad_start(ifp, 0);
2052 in6_ifa_put(ifp);
2053 }
2054 }
2055
2056 static void addrconf_dev_config(struct net_device *dev)
2057 {
2058 struct in6_addr addr;
2059 struct inet6_dev * idev;
2060
2061 ASSERT_RTNL();
2062
2063 if ((dev->type != ARPHRD_ETHER) &&
2064 (dev->type != ARPHRD_FDDI) &&
2065 (dev->type != ARPHRD_IEEE802_TR) &&
2066 (dev->type != ARPHRD_ARCNET) &&
2067 (dev->type != ARPHRD_INFINIBAND)) {
2068 /* Alas, we support only Ethernet autoconfiguration. */
2069 return;
2070 }
2071
2072 idev = addrconf_add_dev(dev);
2073 if (idev == NULL)
2074 return;
2075
2076 memset(&addr, 0, sizeof(struct in6_addr));
2077 addr.s6_addr32[0] = htonl(0xFE800000);
2078
2079 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2080 addrconf_add_linklocal(idev, &addr);
2081 }
2082
2083 static void addrconf_sit_config(struct net_device *dev)
2084 {
2085 struct inet6_dev *idev;
2086
2087 ASSERT_RTNL();
2088
2089 /*
2090 * Configure the tunnel with one of our IPv4
2091 * addresses... we should configure all of
2092 * our v4 addrs in the tunnel
2093 */
2094
2095 if ((idev = ipv6_find_idev(dev)) == NULL) {
2096 printk(KERN_DEBUG "init sit: add_dev failed\n");
2097 return;
2098 }
2099
2100 sit_add_v4_addrs(idev);
2101
2102 if (dev->flags&IFF_POINTOPOINT) {
2103 addrconf_add_mroute(dev);
2104 addrconf_add_lroute(dev);
2105 } else
2106 sit_route_add(dev);
2107 }
2108
2109 static inline int
2110 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2111 {
2112 struct in6_addr lladdr;
2113
2114 if (!ipv6_get_lladdr(link_dev, &lladdr)) {
2115 addrconf_add_linklocal(idev, &lladdr);
2116 return 0;
2117 }
2118 return -1;
2119 }
2120
2121 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2122 {
2123 struct net_device *link_dev;
2124
2125 /* first try to inherit the link-local address from the link device */
2126 if (idev->dev->iflink &&
2127 (link_dev = __dev_get_by_index(idev->dev->iflink))) {
2128 if (!ipv6_inherit_linklocal(idev, link_dev))
2129 return;
2130 }
2131 /* then try to inherit it from any device */
2132 for (link_dev = dev_base; link_dev; link_dev = link_dev->next) {
2133 if (!ipv6_inherit_linklocal(idev, link_dev))
2134 return;
2135 }
2136 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2137 }
2138
2139 /*
2140 * Autoconfigure tunnel with a link-local address so routing protocols,
2141 * DHCPv6, MLD etc. can be run over the virtual link
2142 */
2143
2144 static void addrconf_ip6_tnl_config(struct net_device *dev)
2145 {
2146 struct inet6_dev *idev;
2147
2148 ASSERT_RTNL();
2149
2150 if ((idev = addrconf_add_dev(dev)) == NULL) {
2151 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2152 return;
2153 }
2154 ip6_tnl_add_linklocal(idev);
2155 }
2156
2157 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2158 void * data)
2159 {
2160 struct net_device *dev = (struct net_device *) data;
2161 struct inet6_dev *idev = __in6_dev_get(dev);
2162 int run_pending = 0;
2163
2164 switch(event) {
2165 case NETDEV_UP:
2166 case NETDEV_CHANGE:
2167 if (event == NETDEV_UP) {
2168 if (!netif_carrier_ok(dev)) {
2169 /* device is not ready yet. */
2170 printk(KERN_INFO
2171 "ADDRCONF(NETDEV_UP): %s: "
2172 "link is not ready\n",
2173 dev->name);
2174 break;
2175 }
2176
2177 if (idev)
2178 idev->if_flags |= IF_READY;
2179 } else {
2180 if (!netif_carrier_ok(dev)) {
2181 /* device is still not ready. */
2182 break;
2183 }
2184
2185 if (idev) {
2186 if (idev->if_flags & IF_READY) {
2187 /* device is already configured. */
2188 break;
2189 }
2190 idev->if_flags |= IF_READY;
2191 }
2192
2193 printk(KERN_INFO
2194 "ADDRCONF(NETDEV_CHANGE): %s: "
2195 "link becomes ready\n",
2196 dev->name);
2197
2198 run_pending = 1;
2199 }
2200
2201 switch(dev->type) {
2202 case ARPHRD_SIT:
2203 addrconf_sit_config(dev);
2204 break;
2205 case ARPHRD_TUNNEL6:
2206 addrconf_ip6_tnl_config(dev);
2207 break;
2208 case ARPHRD_LOOPBACK:
2209 init_loopback(dev);
2210 break;
2211
2212 default:
2213 addrconf_dev_config(dev);
2214 break;
2215 };
2216 if (idev) {
2217 if (run_pending)
2218 addrconf_dad_run(idev);
2219
2220 /* If the MTU changed during the interface down, when the
2221 interface up, the changed MTU must be reflected in the
2222 idev as well as routers.
2223 */
2224 if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2225 rt6_mtu_change(dev, dev->mtu);
2226 idev->cnf.mtu6 = dev->mtu;
2227 }
2228 idev->tstamp = jiffies;
2229 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2230 /* If the changed mtu during down is lower than IPV6_MIN_MTU
2231 stop IPv6 on this interface.
2232 */
2233 if (dev->mtu < IPV6_MIN_MTU)
2234 addrconf_ifdown(dev, event != NETDEV_DOWN);
2235 }
2236 break;
2237
2238 case NETDEV_CHANGEMTU:
2239 if ( idev && dev->mtu >= IPV6_MIN_MTU) {
2240 rt6_mtu_change(dev, dev->mtu);
2241 idev->cnf.mtu6 = dev->mtu;
2242 break;
2243 }
2244
2245 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2246
2247 case NETDEV_DOWN:
2248 case NETDEV_UNREGISTER:
2249 /*
2250 * Remove all addresses from this interface.
2251 */
2252 addrconf_ifdown(dev, event != NETDEV_DOWN);
2253 break;
2254
2255 case NETDEV_CHANGENAME:
2256 #ifdef CONFIG_SYSCTL
2257 if (idev) {
2258 addrconf_sysctl_unregister(&idev->cnf);
2259 neigh_sysctl_unregister(idev->nd_parms);
2260 neigh_sysctl_register(dev, idev->nd_parms,
2261 NET_IPV6, NET_IPV6_NEIGH, "ipv6",
2262 &ndisc_ifinfo_sysctl_change,
2263 NULL);
2264 addrconf_sysctl_register(idev, &idev->cnf);
2265 }
2266 #endif
2267 break;
2268 };
2269
2270 return NOTIFY_OK;
2271 }
2272
2273 /*
2274 * addrconf module should be notified of a device going up
2275 */
2276 static struct notifier_block ipv6_dev_notf = {
2277 .notifier_call = addrconf_notify,
2278 .priority = 0
2279 };
2280
2281 static int addrconf_ifdown(struct net_device *dev, int how)
2282 {
2283 struct inet6_dev *idev;
2284 struct inet6_ifaddr *ifa, **bifa;
2285 int i;
2286
2287 ASSERT_RTNL();
2288
2289 if (dev == &loopback_dev && how == 1)
2290 how = 0;
2291
2292 rt6_ifdown(dev);
2293 neigh_ifdown(&nd_tbl, dev);
2294
2295 idev = __in6_dev_get(dev);
2296 if (idev == NULL)
2297 return -ENODEV;
2298
2299 /* Step 1: remove reference to ipv6 device from parent device.
2300 Do not dev_put!
2301 */
2302 if (how == 1) {
2303 write_lock_bh(&addrconf_lock);
2304 dev->ip6_ptr = NULL;
2305 idev->dead = 1;
2306 write_unlock_bh(&addrconf_lock);
2307
2308 /* Step 1.5: remove snmp6 entry */
2309 snmp6_unregister_dev(idev);
2310
2311 }
2312
2313 /* Step 2: clear hash table */
2314 for (i=0; i<IN6_ADDR_HSIZE; i++) {
2315 bifa = &inet6_addr_lst[i];
2316
2317 write_lock_bh(&addrconf_hash_lock);
2318 while ((ifa = *bifa) != NULL) {
2319 if (ifa->idev == idev) {
2320 *bifa = ifa->lst_next;
2321 ifa->lst_next = NULL;
2322 addrconf_del_timer(ifa);
2323 in6_ifa_put(ifa);
2324 continue;
2325 }
2326 bifa = &ifa->lst_next;
2327 }
2328 write_unlock_bh(&addrconf_hash_lock);
2329 }
2330
2331 write_lock_bh(&idev->lock);
2332
2333 /* Step 3: clear flags for stateless addrconf */
2334 if (how != 1)
2335 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2336
2337 /* Step 4: clear address list */
2338 #ifdef CONFIG_IPV6_PRIVACY
2339 if (how == 1 && del_timer(&idev->regen_timer))
2340 in6_dev_put(idev);
2341
2342 /* clear tempaddr list */
2343 while ((ifa = idev->tempaddr_list) != NULL) {
2344 idev->tempaddr_list = ifa->tmp_next;
2345 ifa->tmp_next = NULL;
2346 ifa->dead = 1;
2347 write_unlock_bh(&idev->lock);
2348 spin_lock_bh(&ifa->lock);
2349
2350 if (ifa->ifpub) {
2351 in6_ifa_put(ifa->ifpub);
2352 ifa->ifpub = NULL;
2353 }
2354 spin_unlock_bh(&ifa->lock);
2355 in6_ifa_put(ifa);
2356 write_lock_bh(&idev->lock);
2357 }
2358 #endif
2359 while ((ifa = idev->addr_list) != NULL) {
2360 idev->addr_list = ifa->if_next;
2361 ifa->if_next = NULL;
2362 ifa->dead = 1;
2363 addrconf_del_timer(ifa);
2364 write_unlock_bh(&idev->lock);
2365
2366 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2367 in6_ifa_put(ifa);
2368
2369 write_lock_bh(&idev->lock);
2370 }
2371 write_unlock_bh(&idev->lock);
2372
2373 /* Step 5: Discard multicast list */
2374
2375 if (how == 1)
2376 ipv6_mc_destroy_dev(idev);
2377 else
2378 ipv6_mc_down(idev);
2379
2380 /* Step 5: netlink notification of this interface */
2381 idev->tstamp = jiffies;
2382 inet6_ifinfo_notify(RTM_DELLINK, idev);
2383
2384 /* Shot the device (if unregistered) */
2385
2386 if (how == 1) {
2387 #ifdef CONFIG_SYSCTL
2388 addrconf_sysctl_unregister(&idev->cnf);
2389 neigh_sysctl_unregister(idev->nd_parms);
2390 #endif
2391 neigh_parms_release(&nd_tbl, idev->nd_parms);
2392 neigh_ifdown(&nd_tbl, dev);
2393 in6_dev_put(idev);
2394 }
2395 return 0;
2396 }
2397
2398 static void addrconf_rs_timer(unsigned long data)
2399 {
2400 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2401
2402 if (ifp->idev->cnf.forwarding)
2403 goto out;
2404
2405 if (ifp->idev->if_flags & IF_RA_RCVD) {
2406 /*
2407 * Announcement received after solicitation
2408 * was sent
2409 */
2410 goto out;
2411 }
2412
2413 spin_lock(&ifp->lock);
2414 if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2415 struct in6_addr all_routers;
2416
2417 /* The wait after the last probe can be shorter */
2418 addrconf_mod_timer(ifp, AC_RS,
2419 (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2420 ifp->idev->cnf.rtr_solicit_delay :
2421 ifp->idev->cnf.rtr_solicit_interval);
2422 spin_unlock(&ifp->lock);
2423
2424 ipv6_addr_all_routers(&all_routers);
2425
2426 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2427 } else {
2428 spin_unlock(&ifp->lock);
2429 /*
2430 * Note: we do not support deprecated "all on-link"
2431 * assumption any longer.
2432 */
2433 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2434 ifp->idev->dev->name);
2435 }
2436
2437 out:
2438 in6_ifa_put(ifp);
2439 }
2440
2441 /*
2442 * Duplicate Address Detection
2443 */
2444 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2445 {
2446 unsigned long rand_num;
2447 struct inet6_dev *idev = ifp->idev;
2448
2449 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2450 ifp->probes = idev->cnf.dad_transmits;
2451 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2452 }
2453
2454 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2455 {
2456 struct inet6_dev *idev = ifp->idev;
2457 struct net_device *dev = idev->dev;
2458
2459 addrconf_join_solict(dev, &ifp->addr);
2460
2461 if (ifp->prefix_len != 128 && (ifp->flags&IFA_F_PERMANENT))
2462 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 0,
2463 flags);
2464
2465 net_srandom(ifp->addr.s6_addr32[3]);
2466
2467 read_lock_bh(&idev->lock);
2468 if (ifp->dead)
2469 goto out;
2470 spin_lock_bh(&ifp->lock);
2471
2472 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2473 !(ifp->flags&IFA_F_TENTATIVE)) {
2474 ifp->flags &= ~IFA_F_TENTATIVE;
2475 spin_unlock_bh(&ifp->lock);
2476 read_unlock_bh(&idev->lock);
2477
2478 addrconf_dad_completed(ifp);
2479 return;
2480 }
2481
2482 if (!(idev->if_flags & IF_READY)) {
2483 spin_unlock_bh(&ifp->lock);
2484 read_unlock_bh(&idev->lock);
2485 /*
2486 * If the defice is not ready:
2487 * - keep it tentative if it is a permanent address.
2488 * - otherwise, kill it.
2489 */
2490 in6_ifa_hold(ifp);
2491 addrconf_dad_stop(ifp);
2492 return;
2493 }
2494 addrconf_dad_kick(ifp);
2495 spin_unlock_bh(&ifp->lock);
2496 out:
2497 read_unlock_bh(&idev->lock);
2498 }
2499
2500 static void addrconf_dad_timer(unsigned long data)
2501 {
2502 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2503 struct inet6_dev *idev = ifp->idev;
2504 struct in6_addr unspec;
2505 struct in6_addr mcaddr;
2506
2507 read_lock_bh(&idev->lock);
2508 if (idev->dead) {
2509 read_unlock_bh(&idev->lock);
2510 goto out;
2511 }
2512 spin_lock_bh(&ifp->lock);
2513 if (ifp->probes == 0) {
2514 /*
2515 * DAD was successful
2516 */
2517
2518 ifp->flags &= ~IFA_F_TENTATIVE;
2519 spin_unlock_bh(&ifp->lock);
2520 read_unlock_bh(&idev->lock);
2521
2522 addrconf_dad_completed(ifp);
2523
2524 goto out;
2525 }
2526
2527 ifp->probes--;
2528 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2529 spin_unlock_bh(&ifp->lock);
2530 read_unlock_bh(&idev->lock);
2531
2532 /* send a neighbour solicitation for our addr */
2533 memset(&unspec, 0, sizeof(unspec));
2534 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2535 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec);
2536 out:
2537 in6_ifa_put(ifp);
2538 }
2539
2540 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2541 {
2542 struct net_device * dev = ifp->idev->dev;
2543
2544 /*
2545 * Configure the address for reception. Now it is valid.
2546 */
2547
2548 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2549
2550 /* If added prefix is link local and forwarding is off,
2551 start sending router solicitations.
2552 */
2553
2554 if (ifp->idev->cnf.forwarding == 0 &&
2555 ifp->idev->cnf.rtr_solicits > 0 &&
2556 (dev->flags&IFF_LOOPBACK) == 0 &&
2557 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2558 struct in6_addr all_routers;
2559
2560 ipv6_addr_all_routers(&all_routers);
2561
2562 /*
2563 * If a host as already performed a random delay
2564 * [...] as part of DAD [...] there is no need
2565 * to delay again before sending the first RS
2566 */
2567 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2568
2569 spin_lock_bh(&ifp->lock);
2570 ifp->probes = 1;
2571 ifp->idev->if_flags |= IF_RS_SENT;
2572 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2573 spin_unlock_bh(&ifp->lock);
2574 }
2575 }
2576
2577 static void addrconf_dad_run(struct inet6_dev *idev) {
2578 struct inet6_ifaddr *ifp;
2579
2580 read_lock_bh(&idev->lock);
2581 for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2582 spin_lock_bh(&ifp->lock);
2583 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2584 spin_unlock_bh(&ifp->lock);
2585 continue;
2586 }
2587 spin_unlock_bh(&ifp->lock);
2588 addrconf_dad_kick(ifp);
2589 }
2590 read_unlock_bh(&idev->lock);
2591 }
2592
2593 #ifdef CONFIG_PROC_FS
2594 struct if6_iter_state {
2595 int bucket;
2596 };
2597
2598 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2599 {
2600 struct inet6_ifaddr *ifa = NULL;
2601 struct if6_iter_state *state = seq->private;
2602
2603 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2604 ifa = inet6_addr_lst[state->bucket];
2605 if (ifa)
2606 break;
2607 }
2608 return ifa;
2609 }
2610
2611 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2612 {
2613 struct if6_iter_state *state = seq->private;
2614
2615 ifa = ifa->lst_next;
2616 try_again:
2617 if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2618 ifa = inet6_addr_lst[state->bucket];
2619 goto try_again;
2620 }
2621 return ifa;
2622 }
2623
2624 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2625 {
2626 struct inet6_ifaddr *ifa = if6_get_first(seq);
2627
2628 if (ifa)
2629 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2630 --pos;
2631 return pos ? NULL : ifa;
2632 }
2633
2634 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2635 {
2636 read_lock_bh(&addrconf_hash_lock);
2637 return if6_get_idx(seq, *pos);
2638 }
2639
2640 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2641 {
2642 struct inet6_ifaddr *ifa;
2643
2644 ifa = if6_get_next(seq, v);
2645 ++*pos;
2646 return ifa;
2647 }
2648
2649 static void if6_seq_stop(struct seq_file *seq, void *v)
2650 {
2651 read_unlock_bh(&addrconf_hash_lock);
2652 }
2653
2654 static int if6_seq_show(struct seq_file *seq, void *v)
2655 {
2656 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2657 seq_printf(seq,
2658 NIP6_SEQFMT " %02x %02x %02x %02x %8s\n",
2659 NIP6(ifp->addr),
2660 ifp->idev->dev->ifindex,
2661 ifp->prefix_len,
2662 ifp->scope,
2663 ifp->flags,
2664 ifp->idev->dev->name);
2665 return 0;
2666 }
2667
2668 static struct seq_operations if6_seq_ops = {
2669 .start = if6_seq_start,
2670 .next = if6_seq_next,
2671 .show = if6_seq_show,
2672 .stop = if6_seq_stop,
2673 };
2674
2675 static int if6_seq_open(struct inode *inode, struct file *file)
2676 {
2677 struct seq_file *seq;
2678 int rc = -ENOMEM;
2679 struct if6_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL);
2680
2681 if (!s)
2682 goto out;
2683
2684 rc = seq_open(file, &if6_seq_ops);
2685 if (rc)
2686 goto out_kfree;
2687
2688 seq = file->private_data;
2689 seq->private = s;
2690 out:
2691 return rc;
2692 out_kfree:
2693 kfree(s);
2694 goto out;
2695 }
2696
2697 static struct file_operations if6_fops = {
2698 .owner = THIS_MODULE,
2699 .open = if6_seq_open,
2700 .read = seq_read,
2701 .llseek = seq_lseek,
2702 .release = seq_release_private,
2703 };
2704
2705 int __init if6_proc_init(void)
2706 {
2707 if (!proc_net_fops_create("if_inet6", S_IRUGO, &if6_fops))
2708 return -ENOMEM;
2709 return 0;
2710 }
2711
2712 void if6_proc_exit(void)
2713 {
2714 proc_net_remove("if_inet6");
2715 }
2716 #endif /* CONFIG_PROC_FS */
2717
2718 /*
2719 * Periodic address status verification
2720 */
2721
2722 static void addrconf_verify(unsigned long foo)
2723 {
2724 struct inet6_ifaddr *ifp;
2725 unsigned long now, next;
2726 int i;
2727
2728 spin_lock_bh(&addrconf_verify_lock);
2729 now = jiffies;
2730 next = now + ADDR_CHECK_FREQUENCY;
2731
2732 del_timer(&addr_chk_timer);
2733
2734 for (i=0; i < IN6_ADDR_HSIZE; i++) {
2735
2736 restart:
2737 read_lock(&addrconf_hash_lock);
2738 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
2739 unsigned long age;
2740 #ifdef CONFIG_IPV6_PRIVACY
2741 unsigned long regen_advance;
2742 #endif
2743
2744 if (ifp->flags & IFA_F_PERMANENT)
2745 continue;
2746
2747 spin_lock(&ifp->lock);
2748 age = (now - ifp->tstamp) / HZ;
2749
2750 #ifdef CONFIG_IPV6_PRIVACY
2751 regen_advance = ifp->idev->cnf.regen_max_retry *
2752 ifp->idev->cnf.dad_transmits *
2753 ifp->idev->nd_parms->retrans_time / HZ;
2754 #endif
2755
2756 if (age >= ifp->valid_lft) {
2757 spin_unlock(&ifp->lock);
2758 in6_ifa_hold(ifp);
2759 read_unlock(&addrconf_hash_lock);
2760 ipv6_del_addr(ifp);
2761 goto restart;
2762 } else if (age >= ifp->prefered_lft) {
2763 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
2764 int deprecate = 0;
2765
2766 if (!(ifp->flags&IFA_F_DEPRECATED)) {
2767 deprecate = 1;
2768 ifp->flags |= IFA_F_DEPRECATED;
2769 }
2770
2771 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
2772 next = ifp->tstamp + ifp->valid_lft * HZ;
2773
2774 spin_unlock(&ifp->lock);
2775
2776 if (deprecate) {
2777 in6_ifa_hold(ifp);
2778 read_unlock(&addrconf_hash_lock);
2779
2780 ipv6_ifa_notify(0, ifp);
2781 in6_ifa_put(ifp);
2782 goto restart;
2783 }
2784 #ifdef CONFIG_IPV6_PRIVACY
2785 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
2786 !(ifp->flags&IFA_F_TENTATIVE)) {
2787 if (age >= ifp->prefered_lft - regen_advance) {
2788 struct inet6_ifaddr *ifpub = ifp->ifpub;
2789 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2790 next = ifp->tstamp + ifp->prefered_lft * HZ;
2791 if (!ifp->regen_count && ifpub) {
2792 ifp->regen_count++;
2793 in6_ifa_hold(ifp);
2794 in6_ifa_hold(ifpub);
2795 spin_unlock(&ifp->lock);
2796 read_unlock(&addrconf_hash_lock);
2797 spin_lock(&ifpub->lock);
2798 ifpub->regen_count = 0;
2799 spin_unlock(&ifpub->lock);
2800 ipv6_create_tempaddr(ifpub, ifp);
2801 in6_ifa_put(ifpub);
2802 in6_ifa_put(ifp);
2803 goto restart;
2804 }
2805 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
2806 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
2807 spin_unlock(&ifp->lock);
2808 #endif
2809 } else {
2810 /* ifp->prefered_lft <= ifp->valid_lft */
2811 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2812 next = ifp->tstamp + ifp->prefered_lft * HZ;
2813 spin_unlock(&ifp->lock);
2814 }
2815 }
2816 read_unlock(&addrconf_hash_lock);
2817 }
2818
2819 addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
2820 add_timer(&addr_chk_timer);
2821 spin_unlock_bh(&addrconf_verify_lock);
2822 }
2823
2824 static int
2825 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
2826 {
2827 struct rtattr **rta = arg;
2828 struct ifaddrmsg *ifm = NLMSG_DATA(nlh);
2829 struct in6_addr *pfx;
2830
2831 pfx = NULL;
2832 if (rta[IFA_ADDRESS-1]) {
2833 if (RTA_PAYLOAD(rta[IFA_ADDRESS-1]) < sizeof(*pfx))
2834 return -EINVAL;
2835 pfx = RTA_DATA(rta[IFA_ADDRESS-1]);
2836 }
2837 if (rta[IFA_LOCAL-1]) {
2838 if (pfx && memcmp(pfx, RTA_DATA(rta[IFA_LOCAL-1]), sizeof(*pfx)))
2839 return -EINVAL;
2840 pfx = RTA_DATA(rta[IFA_LOCAL-1]);
2841 }
2842 if (pfx == NULL)
2843 return -EINVAL;
2844
2845 return inet6_addr_del(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
2846 }
2847
2848 static int
2849 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
2850 {
2851 struct rtattr **rta = arg;
2852 struct ifaddrmsg *ifm = NLMSG_DATA(nlh);
2853 struct in6_addr *pfx;
2854
2855 pfx = NULL;
2856 if (rta[IFA_ADDRESS-1]) {
2857 if (RTA_PAYLOAD(rta[IFA_ADDRESS-1]) < sizeof(*pfx))
2858 return -EINVAL;
2859 pfx = RTA_DATA(rta[IFA_ADDRESS-1]);
2860 }
2861 if (rta[IFA_LOCAL-1]) {
2862 if (pfx && memcmp(pfx, RTA_DATA(rta[IFA_LOCAL-1]), sizeof(*pfx)))
2863 return -EINVAL;
2864 pfx = RTA_DATA(rta[IFA_LOCAL-1]);
2865 }
2866 if (pfx == NULL)
2867 return -EINVAL;
2868
2869 return inet6_addr_add(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
2870 }
2871
2872 /* Maximum length of ifa_cacheinfo attributes */
2873 #define INET6_IFADDR_RTA_SPACE \
2874 RTA_SPACE(16) /* IFA_ADDRESS */ + \
2875 RTA_SPACE(sizeof(struct ifa_cacheinfo)) /* CACHEINFO */
2876
2877 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
2878 u32 pid, u32 seq, int event, unsigned int flags)
2879 {
2880 struct ifaddrmsg *ifm;
2881 struct nlmsghdr *nlh;
2882 struct ifa_cacheinfo ci;
2883 unsigned char *b = skb->tail;
2884
2885 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags);
2886 ifm = NLMSG_DATA(nlh);
2887 ifm->ifa_family = AF_INET6;
2888 ifm->ifa_prefixlen = ifa->prefix_len;
2889 ifm->ifa_flags = ifa->flags;
2890 ifm->ifa_scope = RT_SCOPE_UNIVERSE;
2891 if (ifa->scope&IFA_HOST)
2892 ifm->ifa_scope = RT_SCOPE_HOST;
2893 else if (ifa->scope&IFA_LINK)
2894 ifm->ifa_scope = RT_SCOPE_LINK;
2895 else if (ifa->scope&IFA_SITE)
2896 ifm->ifa_scope = RT_SCOPE_SITE;
2897 ifm->ifa_index = ifa->idev->dev->ifindex;
2898 RTA_PUT(skb, IFA_ADDRESS, 16, &ifa->addr);
2899 if (!(ifa->flags&IFA_F_PERMANENT)) {
2900 ci.ifa_prefered = ifa->prefered_lft;
2901 ci.ifa_valid = ifa->valid_lft;
2902 if (ci.ifa_prefered != INFINITY_LIFE_TIME) {
2903 long tval = (jiffies - ifa->tstamp)/HZ;
2904 ci.ifa_prefered -= tval;
2905 if (ci.ifa_valid != INFINITY_LIFE_TIME)
2906 ci.ifa_valid -= tval;
2907 }
2908 } else {
2909 ci.ifa_prefered = INFINITY_LIFE_TIME;
2910 ci.ifa_valid = INFINITY_LIFE_TIME;
2911 }
2912 ci.cstamp = (__u32)(TIME_DELTA(ifa->cstamp, INITIAL_JIFFIES) / HZ * 100
2913 + TIME_DELTA(ifa->cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
2914 ci.tstamp = (__u32)(TIME_DELTA(ifa->tstamp, INITIAL_JIFFIES) / HZ * 100
2915 + TIME_DELTA(ifa->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
2916 RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci);
2917 nlh->nlmsg_len = skb->tail - b;
2918 return skb->len;
2919
2920 nlmsg_failure:
2921 rtattr_failure:
2922 skb_trim(skb, b - skb->data);
2923 return -1;
2924 }
2925
2926 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
2927 u32 pid, u32 seq, int event, u16 flags)
2928 {
2929 struct ifaddrmsg *ifm;
2930 struct nlmsghdr *nlh;
2931 struct ifa_cacheinfo ci;
2932 unsigned char *b = skb->tail;
2933
2934 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags);
2935 ifm = NLMSG_DATA(nlh);
2936 ifm->ifa_family = AF_INET6;
2937 ifm->ifa_prefixlen = 128;
2938 ifm->ifa_flags = IFA_F_PERMANENT;
2939 ifm->ifa_scope = RT_SCOPE_UNIVERSE;
2940 if (ipv6_addr_scope(&ifmca->mca_addr)&IFA_SITE)
2941 ifm->ifa_scope = RT_SCOPE_SITE;
2942 ifm->ifa_index = ifmca->idev->dev->ifindex;
2943 RTA_PUT(skb, IFA_MULTICAST, 16, &ifmca->mca_addr);
2944 ci.cstamp = (__u32)(TIME_DELTA(ifmca->mca_cstamp, INITIAL_JIFFIES) / HZ
2945 * 100 + TIME_DELTA(ifmca->mca_cstamp, INITIAL_JIFFIES) % HZ
2946 * 100 / HZ);
2947 ci.tstamp = (__u32)(TIME_DELTA(ifmca->mca_tstamp, INITIAL_JIFFIES) / HZ
2948 * 100 + TIME_DELTA(ifmca->mca_tstamp, INITIAL_JIFFIES) % HZ
2949 * 100 / HZ);
2950 ci.ifa_prefered = INFINITY_LIFE_TIME;
2951 ci.ifa_valid = INFINITY_LIFE_TIME;
2952 RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci);
2953 nlh->nlmsg_len = skb->tail - b;
2954 return skb->len;
2955
2956 nlmsg_failure:
2957 rtattr_failure:
2958 skb_trim(skb, b - skb->data);
2959 return -1;
2960 }
2961
2962 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
2963 u32 pid, u32 seq, int event, unsigned int flags)
2964 {
2965 struct ifaddrmsg *ifm;
2966 struct nlmsghdr *nlh;
2967 struct ifa_cacheinfo ci;
2968 unsigned char *b = skb->tail;
2969
2970 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags);
2971 ifm = NLMSG_DATA(nlh);
2972 ifm->ifa_family = AF_INET6;
2973 ifm->ifa_prefixlen = 128;
2974 ifm->ifa_flags = IFA_F_PERMANENT;
2975 ifm->ifa_scope = RT_SCOPE_UNIVERSE;
2976 if (ipv6_addr_scope(&ifaca->aca_addr)&IFA_SITE)
2977 ifm->ifa_scope = RT_SCOPE_SITE;
2978 ifm->ifa_index = ifaca->aca_idev->dev->ifindex;
2979 RTA_PUT(skb, IFA_ANYCAST, 16, &ifaca->aca_addr);
2980 ci.cstamp = (__u32)(TIME_DELTA(ifaca->aca_cstamp, INITIAL_JIFFIES) / HZ
2981 * 100 + TIME_DELTA(ifaca->aca_cstamp, INITIAL_JIFFIES) % HZ
2982 * 100 / HZ);
2983 ci.tstamp = (__u32)(TIME_DELTA(ifaca->aca_tstamp, INITIAL_JIFFIES) / HZ
2984 * 100 + TIME_DELTA(ifaca->aca_tstamp, INITIAL_JIFFIES) % HZ
2985 * 100 / HZ);
2986 ci.ifa_prefered = INFINITY_LIFE_TIME;
2987 ci.ifa_valid = INFINITY_LIFE_TIME;
2988 RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci);
2989 nlh->nlmsg_len = skb->tail - b;
2990 return skb->len;
2991
2992 nlmsg_failure:
2993 rtattr_failure:
2994 skb_trim(skb, b - skb->data);
2995 return -1;
2996 }
2997
2998 enum addr_type_t
2999 {
3000 UNICAST_ADDR,
3001 MULTICAST_ADDR,
3002 ANYCAST_ADDR,
3003 };
3004
3005 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3006 enum addr_type_t type)
3007 {
3008 int idx, ip_idx;
3009 int s_idx, s_ip_idx;
3010 int err = 1;
3011 struct net_device *dev;
3012 struct inet6_dev *idev = NULL;
3013 struct inet6_ifaddr *ifa;
3014 struct ifmcaddr6 *ifmca;
3015 struct ifacaddr6 *ifaca;
3016
3017 s_idx = cb->args[0];
3018 s_ip_idx = ip_idx = cb->args[1];
3019 read_lock(&dev_base_lock);
3020
3021 for (dev = dev_base, idx = 0; dev; dev = dev->next, idx++) {
3022 if (idx < s_idx)
3023 continue;
3024 if (idx > s_idx)
3025 s_ip_idx = 0;
3026 ip_idx = 0;
3027 if ((idev = in6_dev_get(dev)) == NULL)
3028 continue;
3029 read_lock_bh(&idev->lock);
3030 switch (type) {
3031 case UNICAST_ADDR:
3032 /* unicast address incl. temp addr */
3033 for (ifa = idev->addr_list; ifa;
3034 ifa = ifa->if_next, ip_idx++) {
3035 if (ip_idx < s_ip_idx)
3036 continue;
3037 if ((err = inet6_fill_ifaddr(skb, ifa,
3038 NETLINK_CB(cb->skb).pid,
3039 cb->nlh->nlmsg_seq, RTM_NEWADDR,
3040 NLM_F_MULTI)) <= 0)
3041 goto done;
3042 }
3043 break;
3044 case MULTICAST_ADDR:
3045 /* multicast address */
3046 for (ifmca = idev->mc_list; ifmca;
3047 ifmca = ifmca->next, ip_idx++) {
3048 if (ip_idx < s_ip_idx)
3049 continue;
3050 if ((err = inet6_fill_ifmcaddr(skb, ifmca,
3051 NETLINK_CB(cb->skb).pid,
3052 cb->nlh->nlmsg_seq, RTM_GETMULTICAST,
3053 NLM_F_MULTI)) <= 0)
3054 goto done;
3055 }
3056 break;
3057 case ANYCAST_ADDR:
3058 /* anycast address */
3059 for (ifaca = idev->ac_list; ifaca;
3060 ifaca = ifaca->aca_next, ip_idx++) {
3061 if (ip_idx < s_ip_idx)
3062 continue;
3063 if ((err = inet6_fill_ifacaddr(skb, ifaca,
3064 NETLINK_CB(cb->skb).pid,
3065 cb->nlh->nlmsg_seq, RTM_GETANYCAST,
3066 NLM_F_MULTI)) <= 0)
3067 goto done;
3068 }
3069 break;
3070 default:
3071 break;
3072 }
3073 read_unlock_bh(&idev->lock);
3074 in6_dev_put(idev);
3075 }
3076 done:
3077 if (err <= 0) {
3078 read_unlock_bh(&idev->lock);
3079 in6_dev_put(idev);
3080 }
3081 read_unlock(&dev_base_lock);
3082 cb->args[0] = idx;
3083 cb->args[1] = ip_idx;
3084 return skb->len;
3085 }
3086
3087 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3088 {
3089 enum addr_type_t type = UNICAST_ADDR;
3090 return inet6_dump_addr(skb, cb, type);
3091 }
3092
3093 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3094 {
3095 enum addr_type_t type = MULTICAST_ADDR;
3096 return inet6_dump_addr(skb, cb, type);
3097 }
3098
3099
3100 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3101 {
3102 enum addr_type_t type = ANYCAST_ADDR;
3103 return inet6_dump_addr(skb, cb, type);
3104 }
3105
3106 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3107 {
3108 struct sk_buff *skb;
3109 int size = NLMSG_SPACE(sizeof(struct ifaddrmsg) + INET6_IFADDR_RTA_SPACE);
3110
3111 skb = alloc_skb(size, GFP_ATOMIC);
3112 if (!skb) {
3113 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFADDR, ENOBUFS);
3114 return;
3115 }
3116 if (inet6_fill_ifaddr(skb, ifa, current->pid, 0, event, 0) < 0) {
3117 kfree_skb(skb);
3118 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFADDR, EINVAL);
3119 return;
3120 }
3121 NETLINK_CB(skb).dst_group = RTNLGRP_IPV6_IFADDR;
3122 netlink_broadcast(rtnl, skb, 0, RTNLGRP_IPV6_IFADDR, GFP_ATOMIC);
3123 }
3124
3125 static void inline ipv6_store_devconf(struct ipv6_devconf *cnf,
3126 __s32 *array, int bytes)
3127 {
3128 memset(array, 0, bytes);
3129 array[DEVCONF_FORWARDING] = cnf->forwarding;
3130 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3131 array[DEVCONF_MTU6] = cnf->mtu6;
3132 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3133 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3134 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3135 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3136 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3137 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3138 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3139 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3140 #ifdef CONFIG_IPV6_PRIVACY
3141 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3142 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3143 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3144 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3145 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3146 #endif
3147 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3148 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3149 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3150 #ifdef CONFIG_IPV6_ROUTER_PREF
3151 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3152 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
3153 #ifdef CONFIV_IPV6_ROUTE_INFO
3154 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3155 #endif
3156 #endif
3157 }
3158
3159 /* Maximum length of ifinfomsg attributes */
3160 #define INET6_IFINFO_RTA_SPACE \
3161 RTA_SPACE(IFNAMSIZ) /* IFNAME */ + \
3162 RTA_SPACE(MAX_ADDR_LEN) /* ADDRESS */ + \
3163 RTA_SPACE(sizeof(u32)) /* MTU */ + \
3164 RTA_SPACE(sizeof(int)) /* LINK */ + \
3165 RTA_SPACE(0) /* PROTINFO */ + \
3166 RTA_SPACE(sizeof(u32)) /* FLAGS */ + \
3167 RTA_SPACE(sizeof(struct ifla_cacheinfo)) /* CACHEINFO */ + \
3168 RTA_SPACE(sizeof(__s32[DEVCONF_MAX])) /* CONF */
3169
3170 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3171 u32 pid, u32 seq, int event, unsigned int flags)
3172 {
3173 struct net_device *dev = idev->dev;
3174 __s32 *array = NULL;
3175 struct ifinfomsg *r;
3176 struct nlmsghdr *nlh;
3177 unsigned char *b = skb->tail;
3178 struct rtattr *subattr;
3179 __u32 mtu = dev->mtu;
3180 struct ifla_cacheinfo ci;
3181
3182 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*r), flags);
3183 r = NLMSG_DATA(nlh);
3184 r->ifi_family = AF_INET6;
3185 r->__ifi_pad = 0;
3186 r->ifi_type = dev->type;
3187 r->ifi_index = dev->ifindex;
3188 r->ifi_flags = dev_get_flags(dev);
3189 r->ifi_change = 0;
3190
3191 RTA_PUT(skb, IFLA_IFNAME, strlen(dev->name)+1, dev->name);
3192
3193 if (dev->addr_len)
3194 RTA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3195
3196 RTA_PUT(skb, IFLA_MTU, sizeof(mtu), &mtu);
3197 if (dev->ifindex != dev->iflink)
3198 RTA_PUT(skb, IFLA_LINK, sizeof(int), &dev->iflink);
3199
3200 subattr = (struct rtattr*)skb->tail;
3201
3202 RTA_PUT(skb, IFLA_PROTINFO, 0, NULL);
3203
3204 /* return the device flags */
3205 RTA_PUT(skb, IFLA_INET6_FLAGS, sizeof(__u32), &idev->if_flags);
3206
3207 /* return interface cacheinfo */
3208 ci.max_reasm_len = IPV6_MAXPLEN;
3209 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3210 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3211 ci.reachable_time = idev->nd_parms->reachable_time;
3212 ci.retrans_time = idev->nd_parms->retrans_time;
3213 RTA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3214
3215 /* return the device sysctl params */
3216 if ((array = kmalloc(DEVCONF_MAX * sizeof(*array), GFP_ATOMIC)) == NULL)
3217 goto rtattr_failure;
3218 ipv6_store_devconf(&idev->cnf, array, DEVCONF_MAX * sizeof(*array));
3219 RTA_PUT(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(*array), array);
3220
3221 /* XXX - Statistics/MC not implemented */
3222 subattr->rta_len = skb->tail - (u8*)subattr;
3223
3224 nlh->nlmsg_len = skb->tail - b;
3225 kfree(array);
3226 return skb->len;
3227
3228 nlmsg_failure:
3229 rtattr_failure:
3230 kfree(array);
3231 skb_trim(skb, b - skb->data);
3232 return -1;
3233 }
3234
3235 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3236 {
3237 int idx, err;
3238 int s_idx = cb->args[0];
3239 struct net_device *dev;
3240 struct inet6_dev *idev;
3241
3242 read_lock(&dev_base_lock);
3243 for (dev=dev_base, idx=0; dev; dev = dev->next, idx++) {
3244 if (idx < s_idx)
3245 continue;
3246 if ((idev = in6_dev_get(dev)) == NULL)
3247 continue;
3248 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
3249 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
3250 in6_dev_put(idev);
3251 if (err <= 0)
3252 break;
3253 }
3254 read_unlock(&dev_base_lock);
3255 cb->args[0] = idx;
3256
3257 return skb->len;
3258 }
3259
3260 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3261 {
3262 struct sk_buff *skb;
3263 int size = NLMSG_SPACE(sizeof(struct ifinfomsg) + INET6_IFINFO_RTA_SPACE);
3264
3265 skb = alloc_skb(size, GFP_ATOMIC);
3266 if (!skb) {
3267 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFINFO, ENOBUFS);
3268 return;
3269 }
3270 if (inet6_fill_ifinfo(skb, idev, current->pid, 0, event, 0) < 0) {
3271 kfree_skb(skb);
3272 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFINFO, EINVAL);
3273 return;
3274 }
3275 NETLINK_CB(skb).dst_group = RTNLGRP_IPV6_IFINFO;
3276 netlink_broadcast(rtnl, skb, 0, RTNLGRP_IPV6_IFINFO, GFP_ATOMIC);
3277 }
3278
3279 /* Maximum length of prefix_cacheinfo attributes */
3280 #define INET6_PREFIX_RTA_SPACE \
3281 RTA_SPACE(sizeof(((struct prefix_info *)NULL)->prefix)) /* ADDRESS */ + \
3282 RTA_SPACE(sizeof(struct prefix_cacheinfo)) /* CACHEINFO */
3283
3284 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
3285 struct prefix_info *pinfo, u32 pid, u32 seq,
3286 int event, unsigned int flags)
3287 {
3288 struct prefixmsg *pmsg;
3289 struct nlmsghdr *nlh;
3290 unsigned char *b = skb->tail;
3291 struct prefix_cacheinfo ci;
3292
3293 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*pmsg), flags);
3294 pmsg = NLMSG_DATA(nlh);
3295 pmsg->prefix_family = AF_INET6;
3296 pmsg->prefix_pad1 = 0;
3297 pmsg->prefix_pad2 = 0;
3298 pmsg->prefix_ifindex = idev->dev->ifindex;
3299 pmsg->prefix_len = pinfo->prefix_len;
3300 pmsg->prefix_type = pinfo->type;
3301 pmsg->prefix_pad3 = 0;
3302
3303 pmsg->prefix_flags = 0;
3304 if (pinfo->onlink)
3305 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3306 if (pinfo->autoconf)
3307 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3308
3309 RTA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
3310
3311 ci.preferred_time = ntohl(pinfo->prefered);
3312 ci.valid_time = ntohl(pinfo->valid);
3313 RTA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
3314
3315 nlh->nlmsg_len = skb->tail - b;
3316 return skb->len;
3317
3318 nlmsg_failure:
3319 rtattr_failure:
3320 skb_trim(skb, b - skb->data);
3321 return -1;
3322 }
3323
3324 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
3325 struct prefix_info *pinfo)
3326 {
3327 struct sk_buff *skb;
3328 int size = NLMSG_SPACE(sizeof(struct prefixmsg) + INET6_PREFIX_RTA_SPACE);
3329
3330 skb = alloc_skb(size, GFP_ATOMIC);
3331 if (!skb) {
3332 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_PREFIX, ENOBUFS);
3333 return;
3334 }
3335 if (inet6_fill_prefix(skb, idev, pinfo, current->pid, 0, event, 0) < 0) {
3336 kfree_skb(skb);
3337 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_PREFIX, EINVAL);
3338 return;
3339 }
3340 NETLINK_CB(skb).dst_group = RTNLGRP_IPV6_PREFIX;
3341 netlink_broadcast(rtnl, skb, 0, RTNLGRP_IPV6_PREFIX, GFP_ATOMIC);
3342 }
3343
3344 static struct rtnetlink_link inet6_rtnetlink_table[RTM_NR_MSGTYPES] = {
3345 [RTM_GETLINK - RTM_BASE] = { .dumpit = inet6_dump_ifinfo, },
3346 [RTM_NEWADDR - RTM_BASE] = { .doit = inet6_rtm_newaddr, },
3347 [RTM_DELADDR - RTM_BASE] = { .doit = inet6_rtm_deladdr, },
3348 [RTM_GETADDR - RTM_BASE] = { .dumpit = inet6_dump_ifaddr, },
3349 [RTM_GETMULTICAST - RTM_BASE] = { .dumpit = inet6_dump_ifmcaddr, },
3350 [RTM_GETANYCAST - RTM_BASE] = { .dumpit = inet6_dump_ifacaddr, },
3351 [RTM_NEWROUTE - RTM_BASE] = { .doit = inet6_rtm_newroute, },
3352 [RTM_DELROUTE - RTM_BASE] = { .doit = inet6_rtm_delroute, },
3353 [RTM_GETROUTE - RTM_BASE] = { .doit = inet6_rtm_getroute,
3354 .dumpit = inet6_dump_fib, },
3355 };
3356
3357 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3358 {
3359 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3360
3361 switch (event) {
3362 case RTM_NEWADDR:
3363 ip6_ins_rt(ifp->rt, NULL, NULL, NULL);
3364 if (ifp->idev->cnf.forwarding)
3365 addrconf_join_anycast(ifp);
3366 break;
3367 case RTM_DELADDR:
3368 if (ifp->idev->cnf.forwarding)
3369 addrconf_leave_anycast(ifp);
3370 addrconf_leave_solict(ifp->idev, &ifp->addr);
3371 dst_hold(&ifp->rt->u.dst);
3372 if (ip6_del_rt(ifp->rt, NULL, NULL, NULL))
3373 dst_free(&ifp->rt->u.dst);
3374 break;
3375 }
3376 }
3377
3378 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3379 {
3380 read_lock_bh(&addrconf_lock);
3381 if (likely(ifp->idev->dead == 0))
3382 __ipv6_ifa_notify(event, ifp);
3383 read_unlock_bh(&addrconf_lock);
3384 }
3385
3386 #ifdef CONFIG_SYSCTL
3387
3388 static
3389 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3390 void __user *buffer, size_t *lenp, loff_t *ppos)
3391 {
3392 int *valp = ctl->data;
3393 int val = *valp;
3394 int ret;
3395
3396 ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3397
3398 if (write && valp != &ipv6_devconf_dflt.forwarding) {
3399 if (valp != &ipv6_devconf.forwarding) {
3400 if ((!*valp) ^ (!val)) {
3401 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
3402 if (idev == NULL)
3403 return ret;
3404 dev_forward_change(idev);
3405 }
3406 } else {
3407 ipv6_devconf_dflt.forwarding = ipv6_devconf.forwarding;
3408 addrconf_forward_change();
3409 }
3410 if (*valp)
3411 rt6_purge_dflt_routers();
3412 }
3413
3414 return ret;
3415 }
3416
3417 static int addrconf_sysctl_forward_strategy(ctl_table *table,
3418 int __user *name, int nlen,
3419 void __user *oldval,
3420 size_t __user *oldlenp,
3421 void __user *newval, size_t newlen,
3422 void **context)
3423 {
3424 int *valp = table->data;
3425 int new;
3426
3427 if (!newval || !newlen)
3428 return 0;
3429 if (newlen != sizeof(int))
3430 return -EINVAL;
3431 if (get_user(new, (int __user *)newval))
3432 return -EFAULT;
3433 if (new == *valp)
3434 return 0;
3435 if (oldval && oldlenp) {
3436 size_t len;
3437 if (get_user(len, oldlenp))
3438 return -EFAULT;
3439 if (len) {
3440 if (len > table->maxlen)
3441 len = table->maxlen;
3442 if (copy_to_user(oldval, valp, len))
3443 return -EFAULT;
3444 if (put_user(len, oldlenp))
3445 return -EFAULT;
3446 }
3447 }
3448
3449 if (valp != &ipv6_devconf_dflt.forwarding) {
3450 if (valp != &ipv6_devconf.forwarding) {
3451 struct inet6_dev *idev = (struct inet6_dev *)table->extra1;
3452 int changed;
3453 if (unlikely(idev == NULL))
3454 return -ENODEV;
3455 changed = (!*valp) ^ (!new);
3456 *valp = new;
3457 if (changed)
3458 dev_forward_change(idev);
3459 } else {
3460 *valp = new;
3461 addrconf_forward_change();
3462 }
3463
3464 if (*valp)
3465 rt6_purge_dflt_routers();
3466 } else
3467 *valp = new;
3468
3469 return 1;
3470 }
3471
3472 static struct addrconf_sysctl_table
3473 {
3474 struct ctl_table_header *sysctl_header;
3475 ctl_table addrconf_vars[__NET_IPV6_MAX];
3476 ctl_table addrconf_dev[2];
3477 ctl_table addrconf_conf_dir[2];
3478 ctl_table addrconf_proto_dir[2];
3479 ctl_table addrconf_root_dir[2];
3480 } addrconf_sysctl = {
3481 .sysctl_header = NULL,
3482 .addrconf_vars = {
3483 {
3484 .ctl_name = NET_IPV6_FORWARDING,
3485 .procname = "forwarding",
3486 .data = &ipv6_devconf.forwarding,
3487 .maxlen = sizeof(int),
3488 .mode = 0644,
3489 .proc_handler = &addrconf_sysctl_forward,
3490 .strategy = &addrconf_sysctl_forward_strategy,
3491 },
3492 {
3493 .ctl_name = NET_IPV6_HOP_LIMIT,
3494 .procname = "hop_limit",
3495 .data = &ipv6_devconf.hop_limit,
3496 .maxlen = sizeof(int),
3497 .mode = 0644,
3498 .proc_handler = proc_dointvec,
3499 },
3500 {
3501 .ctl_name = NET_IPV6_MTU,
3502 .procname = "mtu",
3503 .data = &ipv6_devconf.mtu6,
3504 .maxlen = sizeof(int),
3505 .mode = 0644,
3506 .proc_handler = &proc_dointvec,
3507 },
3508 {
3509 .ctl_name = NET_IPV6_ACCEPT_RA,
3510 .procname = "accept_ra",
3511 .data = &ipv6_devconf.accept_ra,
3512 .maxlen = sizeof(int),
3513 .mode = 0644,
3514 .proc_handler = &proc_dointvec,
3515 },
3516 {
3517 .ctl_name = NET_IPV6_ACCEPT_REDIRECTS,
3518 .procname = "accept_redirects",
3519 .data = &ipv6_devconf.accept_redirects,
3520 .maxlen = sizeof(int),
3521 .mode = 0644,
3522 .proc_handler = &proc_dointvec,
3523 },
3524 {
3525 .ctl_name = NET_IPV6_AUTOCONF,
3526 .procname = "autoconf",
3527 .data = &ipv6_devconf.autoconf,
3528 .maxlen = sizeof(int),
3529 .mode = 0644,
3530 .proc_handler = &proc_dointvec,
3531 },
3532 {
3533 .ctl_name = NET_IPV6_DAD_TRANSMITS,
3534 .procname = "dad_transmits",
3535 .data = &ipv6_devconf.dad_transmits,
3536 .maxlen = sizeof(int),
3537 .mode = 0644,
3538 .proc_handler = &proc_dointvec,
3539 },
3540 {
3541 .ctl_name = NET_IPV6_RTR_SOLICITS,
3542 .procname = "router_solicitations",
3543 .data = &ipv6_devconf.rtr_solicits,
3544 .maxlen = sizeof(int),
3545 .mode = 0644,
3546 .proc_handler = &proc_dointvec,
3547 },
3548 {
3549 .ctl_name = NET_IPV6_RTR_SOLICIT_INTERVAL,
3550 .procname = "router_solicitation_interval",
3551 .data = &ipv6_devconf.rtr_solicit_interval,
3552 .maxlen = sizeof(int),
3553 .mode = 0644,
3554 .proc_handler = &proc_dointvec_jiffies,
3555 .strategy = &sysctl_jiffies,
3556 },
3557 {
3558 .ctl_name = NET_IPV6_RTR_SOLICIT_DELAY,
3559 .procname = "router_solicitation_delay",
3560 .data = &ipv6_devconf.rtr_solicit_delay,
3561 .maxlen = sizeof(int),
3562 .mode = 0644,
3563 .proc_handler = &proc_dointvec_jiffies,
3564 .strategy = &sysctl_jiffies,
3565 },
3566 {
3567 .ctl_name = NET_IPV6_FORCE_MLD_VERSION,
3568 .procname = "force_mld_version",
3569 .data = &ipv6_devconf.force_mld_version,
3570 .maxlen = sizeof(int),
3571 .mode = 0644,
3572 .proc_handler = &proc_dointvec,
3573 },
3574 #ifdef CONFIG_IPV6_PRIVACY
3575 {
3576 .ctl_name = NET_IPV6_USE_TEMPADDR,
3577 .procname = "use_tempaddr",
3578 .data = &ipv6_devconf.use_tempaddr,
3579 .maxlen = sizeof(int),
3580 .mode = 0644,
3581 .proc_handler = &proc_dointvec,
3582 },
3583 {
3584 .ctl_name = NET_IPV6_TEMP_VALID_LFT,
3585 .procname = "temp_valid_lft",
3586 .data = &ipv6_devconf.temp_valid_lft,
3587 .maxlen = sizeof(int),
3588 .mode = 0644,
3589 .proc_handler = &proc_dointvec,
3590 },
3591 {
3592 .ctl_name = NET_IPV6_TEMP_PREFERED_LFT,
3593 .procname = "temp_prefered_lft",
3594 .data = &ipv6_devconf.temp_prefered_lft,
3595 .maxlen = sizeof(int),
3596 .mode = 0644,
3597 .proc_handler = &proc_dointvec,
3598 },
3599 {
3600 .ctl_name = NET_IPV6_REGEN_MAX_RETRY,
3601 .procname = "regen_max_retry",
3602 .data = &ipv6_devconf.regen_max_retry,
3603 .maxlen = sizeof(int),
3604 .mode = 0644,
3605 .proc_handler = &proc_dointvec,
3606 },
3607 {
3608 .ctl_name = NET_IPV6_MAX_DESYNC_FACTOR,
3609 .procname = "max_desync_factor",
3610 .data = &ipv6_devconf.max_desync_factor,
3611 .maxlen = sizeof(int),
3612 .mode = 0644,
3613 .proc_handler = &proc_dointvec,
3614 },
3615 #endif
3616 {
3617 .ctl_name = NET_IPV6_MAX_ADDRESSES,
3618 .procname = "max_addresses",
3619 .data = &ipv6_devconf.max_addresses,
3620 .maxlen = sizeof(int),
3621 .mode = 0644,
3622 .proc_handler = &proc_dointvec,
3623 },
3624 {
3625 .ctl_name = NET_IPV6_ACCEPT_RA_DEFRTR,
3626 .procname = "accept_ra_defrtr",
3627 .data = &ipv6_devconf.accept_ra_defrtr,
3628 .maxlen = sizeof(int),
3629 .mode = 0644,
3630 .proc_handler = &proc_dointvec,
3631 },
3632 {
3633 .ctl_name = NET_IPV6_ACCEPT_RA_PINFO,
3634 .procname = "accept_ra_pinfo",
3635 .data = &ipv6_devconf.accept_ra_pinfo,
3636 .maxlen = sizeof(int),
3637 .mode = 0644,
3638 .proc_handler = &proc_dointvec,
3639 },
3640 #ifdef CONFIG_IPV6_ROUTER_PREF
3641 {
3642 .ctl_name = NET_IPV6_ACCEPT_RA_RTR_PREF,
3643 .procname = "accept_ra_rtr_pref",
3644 .data = &ipv6_devconf.accept_ra_rtr_pref,
3645 .maxlen = sizeof(int),
3646 .mode = 0644,
3647 .proc_handler = &proc_dointvec,
3648 },
3649 {
3650 .ctl_name = NET_IPV6_RTR_PROBE_INTERVAL,
3651 .procname = "router_probe_interval",
3652 .data = &ipv6_devconf.rtr_probe_interval,
3653 .maxlen = sizeof(int),
3654 .mode = 0644,
3655 .proc_handler = &proc_dointvec_jiffies,
3656 .strategy = &sysctl_jiffies,
3657 },
3658 #ifdef CONFIV_IPV6_ROUTE_INFO
3659 {
3660 .ctl_name = NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN,
3661 .procname = "accept_ra_rt_info_max_plen",
3662 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
3663 .maxlen = sizeof(int),
3664 .mode = 0644,
3665 .proc_handler = &proc_dointvec,
3666 },
3667 #endif
3668 #endif
3669 {
3670 .ctl_name = 0, /* sentinel */
3671 }
3672 },
3673 .addrconf_dev = {
3674 {
3675 .ctl_name = NET_PROTO_CONF_ALL,
3676 .procname = "all",
3677 .mode = 0555,
3678 .child = addrconf_sysctl.addrconf_vars,
3679 },
3680 {
3681 .ctl_name = 0, /* sentinel */
3682 }
3683 },
3684 .addrconf_conf_dir = {
3685 {
3686 .ctl_name = NET_IPV6_CONF,
3687 .procname = "conf",
3688 .mode = 0555,
3689 .child = addrconf_sysctl.addrconf_dev,
3690 },
3691 {
3692 .ctl_name = 0, /* sentinel */
3693 }
3694 },
3695 .addrconf_proto_dir = {
3696 {
3697 .ctl_name = NET_IPV6,
3698 .procname = "ipv6",
3699 .mode = 0555,
3700 .child = addrconf_sysctl.addrconf_conf_dir,
3701 },
3702 {
3703 .ctl_name = 0, /* sentinel */
3704 }
3705 },
3706 .addrconf_root_dir = {
3707 {
3708 .ctl_name = CTL_NET,
3709 .procname = "net",
3710 .mode = 0555,
3711 .child = addrconf_sysctl.addrconf_proto_dir,
3712 },
3713 {
3714 .ctl_name = 0, /* sentinel */
3715 }
3716 },
3717 };
3718
3719 static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p)
3720 {
3721 int i;
3722 struct net_device *dev = idev ? idev->dev : NULL;
3723 struct addrconf_sysctl_table *t;
3724 char *dev_name = NULL;
3725
3726 t = kmalloc(sizeof(*t), GFP_KERNEL);
3727 if (t == NULL)
3728 return;
3729 memcpy(t, &addrconf_sysctl, sizeof(*t));
3730 for (i=0; t->addrconf_vars[i].data; i++) {
3731 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
3732 t->addrconf_vars[i].de = NULL;
3733 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
3734 }
3735 if (dev) {
3736 dev_name = dev->name;
3737 t->addrconf_dev[0].ctl_name = dev->ifindex;
3738 } else {
3739 dev_name = "default";
3740 t->addrconf_dev[0].ctl_name = NET_PROTO_CONF_DEFAULT;
3741 }
3742
3743 /*
3744 * Make a copy of dev_name, because '.procname' is regarded as const
3745 * by sysctl and we wouldn't want anyone to change it under our feet
3746 * (see SIOCSIFNAME).
3747 */
3748 dev_name = kstrdup(dev_name, GFP_KERNEL);
3749 if (!dev_name)
3750 goto free;
3751
3752 t->addrconf_dev[0].procname = dev_name;
3753
3754 t->addrconf_dev[0].child = t->addrconf_vars;
3755 t->addrconf_dev[0].de = NULL;
3756 t->addrconf_conf_dir[0].child = t->addrconf_dev;
3757 t->addrconf_conf_dir[0].de = NULL;
3758 t->addrconf_proto_dir[0].child = t->addrconf_conf_dir;
3759 t->addrconf_proto_dir[0].de = NULL;
3760 t->addrconf_root_dir[0].child = t->addrconf_proto_dir;
3761 t->addrconf_root_dir[0].de = NULL;
3762
3763 t->sysctl_header = register_sysctl_table(t->addrconf_root_dir, 0);
3764 if (t->sysctl_header == NULL)
3765 goto free_procname;
3766 else
3767 p->sysctl = t;
3768 return;
3769
3770 /* error path */
3771 free_procname:
3772 kfree(dev_name);
3773 free:
3774 kfree(t);
3775
3776 return;
3777 }
3778
3779 static void addrconf_sysctl_unregister(struct ipv6_devconf *p)
3780 {
3781 if (p->sysctl) {
3782 struct addrconf_sysctl_table *t = p->sysctl;
3783 p->sysctl = NULL;
3784 unregister_sysctl_table(t->sysctl_header);
3785 kfree(t->addrconf_dev[0].procname);
3786 kfree(t);
3787 }
3788 }
3789
3790
3791 #endif
3792
3793 /*
3794 * Device notifier
3795 */
3796
3797 int register_inet6addr_notifier(struct notifier_block *nb)
3798 {
3799 return atomic_notifier_chain_register(&inet6addr_chain, nb);
3800 }
3801
3802 int unregister_inet6addr_notifier(struct notifier_block *nb)
3803 {
3804 return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
3805 }
3806
3807 /*
3808 * Init / cleanup code
3809 */
3810
3811 int __init addrconf_init(void)
3812 {
3813 int err = 0;
3814
3815 /* The addrconf netdev notifier requires that loopback_dev
3816 * has it's ipv6 private information allocated and setup
3817 * before it can bring up and give link-local addresses
3818 * to other devices which are up.
3819 *
3820 * Unfortunately, loopback_dev is not necessarily the first
3821 * entry in the global dev_base list of net devices. In fact,
3822 * it is likely to be the very last entry on that list.
3823 * So this causes the notifier registry below to try and
3824 * give link-local addresses to all devices besides loopback_dev
3825 * first, then loopback_dev, which cases all the non-loopback_dev
3826 * devices to fail to get a link-local address.
3827 *
3828 * So, as a temporary fix, allocate the ipv6 structure for
3829 * loopback_dev first by hand.
3830 * Longer term, all of the dependencies ipv6 has upon the loopback
3831 * device and it being up should be removed.
3832 */
3833 rtnl_lock();
3834 if (!ipv6_add_dev(&loopback_dev))
3835 err = -ENOMEM;
3836 rtnl_unlock();
3837 if (err)
3838 return err;
3839
3840 ip6_null_entry.rt6i_idev = in6_dev_get(&loopback_dev);
3841
3842 register_netdevice_notifier(&ipv6_dev_notf);
3843
3844 addrconf_verify(0);
3845 rtnetlink_links[PF_INET6] = inet6_rtnetlink_table;
3846 #ifdef CONFIG_SYSCTL
3847 addrconf_sysctl.sysctl_header =
3848 register_sysctl_table(addrconf_sysctl.addrconf_root_dir, 0);
3849 addrconf_sysctl_register(NULL, &ipv6_devconf_dflt);
3850 #endif
3851
3852 return 0;
3853 }
3854
3855 void __exit addrconf_cleanup(void)
3856 {
3857 struct net_device *dev;
3858 struct inet6_dev *idev;
3859 struct inet6_ifaddr *ifa;
3860 int i;
3861
3862 unregister_netdevice_notifier(&ipv6_dev_notf);
3863
3864 rtnetlink_links[PF_INET6] = NULL;
3865 #ifdef CONFIG_SYSCTL
3866 addrconf_sysctl_unregister(&ipv6_devconf_dflt);
3867 addrconf_sysctl_unregister(&ipv6_devconf);
3868 #endif
3869
3870 rtnl_lock();
3871
3872 /*
3873 * clean dev list.
3874 */
3875
3876 for (dev=dev_base; dev; dev=dev->next) {
3877 if ((idev = __in6_dev_get(dev)) == NULL)
3878 continue;
3879 addrconf_ifdown(dev, 1);
3880 }
3881 addrconf_ifdown(&loopback_dev, 2);
3882
3883 /*
3884 * Check hash table.
3885 */
3886
3887 write_lock_bh(&addrconf_hash_lock);
3888 for (i=0; i < IN6_ADDR_HSIZE; i++) {
3889 for (ifa=inet6_addr_lst[i]; ifa; ) {
3890 struct inet6_ifaddr *bifa;
3891
3892 bifa = ifa;
3893 ifa = ifa->lst_next;
3894 printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
3895 /* Do not free it; something is wrong.
3896 Now we can investigate it with debugger.
3897 */
3898 }
3899 }
3900 write_unlock_bh(&addrconf_hash_lock);
3901
3902 del_timer(&addr_chk_timer);
3903
3904 rtnl_unlock();
3905
3906 #ifdef CONFIG_PROC_FS
3907 proc_net_remove("if_inet6");
3908 #endif
3909 }
Linux with added FPC-III support