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Linux 2.6.20.7
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / ipv6 / addrconf.c
blob58cb669a27cabcb4c93ed8d5d3a337eaa7682aad
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/errno.h>
44 #include <linux/types.h>
45 #include <linux/socket.h>
46 #include <linux/sockios.h>
47 #include <linux/sched.h>
48 #include <linux/net.h>
49 #include <linux/in6.h>
50 #include <linux/netdevice.h>
51 #include <linux/if_addr.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 <net/netlink.h>
77 #include <linux/if_tunnel.h>
78 #include <linux/rtnetlink.h>
79
80 #ifdef CONFIG_IPV6_PRIVACY
81 #include <linux/random.h>
82 #endif
83
84 #include <asm/uaccess.h>
85
86 #include <linux/proc_fs.h>
87 #include <linux/seq_file.h>
88
89 /* Set to 3 to get tracing... */
90 #define ACONF_DEBUG 2
91
92 #if ACONF_DEBUG >= 3
93 #define ADBG(x) printk x
94 #else
95 #define ADBG(x)
96 #endif
97
98 #define INFINITY_LIFE_TIME 0xFFFFFFFF
99 #define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b)))
100
101 #ifdef CONFIG_SYSCTL
102 static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p);
103 static void addrconf_sysctl_unregister(struct ipv6_devconf *p);
104 #endif
105
106 #ifdef CONFIG_IPV6_PRIVACY
107 static int __ipv6_regen_rndid(struct inet6_dev *idev);
108 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
109 static void ipv6_regen_rndid(unsigned long data);
110
111 static int desync_factor = MAX_DESYNC_FACTOR * HZ;
112 #endif
113
114 static int ipv6_count_addresses(struct inet6_dev *idev);
115
116 /*
117 * Configured unicast address hash table
118 */
119 static struct inet6_ifaddr *inet6_addr_lst[IN6_ADDR_HSIZE];
120 static DEFINE_RWLOCK(addrconf_hash_lock);
121
122 static void addrconf_verify(unsigned long);
123
124 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
125 static DEFINE_SPINLOCK(addrconf_verify_lock);
126
127 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
128 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
129
130 static int addrconf_ifdown(struct net_device *dev, int how);
131
132 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
133 static void addrconf_dad_timer(unsigned long data);
134 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
135 static void addrconf_dad_run(struct inet6_dev *idev);
136 static void addrconf_rs_timer(unsigned long data);
137 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
138 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
139
140 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
141 struct prefix_info *pinfo);
142 static int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev);
143
144 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
145
146 struct ipv6_devconf ipv6_devconf __read_mostly = {
147 .forwarding = 0,
148 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
149 .mtu6 = IPV6_MIN_MTU,
150 .accept_ra = 1,
151 .accept_redirects = 1,
152 .autoconf = 1,
153 .force_mld_version = 0,
154 .dad_transmits = 1,
155 .rtr_solicits = MAX_RTR_SOLICITATIONS,
156 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
157 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
158 #ifdef CONFIG_IPV6_PRIVACY
159 .use_tempaddr = 0,
160 .temp_valid_lft = TEMP_VALID_LIFETIME,
161 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
162 .regen_max_retry = REGEN_MAX_RETRY,
163 .max_desync_factor = MAX_DESYNC_FACTOR,
164 #endif
165 .max_addresses = IPV6_MAX_ADDRESSES,
166 .accept_ra_defrtr = 1,
167 .accept_ra_pinfo = 1,
168 #ifdef CONFIG_IPV6_ROUTER_PREF
169 .accept_ra_rtr_pref = 1,
170 .rtr_probe_interval = 60 * HZ,
171 #ifdef CONFIG_IPV6_ROUTE_INFO
172 .accept_ra_rt_info_max_plen = 0,
173 #endif
174 #endif
175 .proxy_ndp = 0,
176 };
177
178 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
179 .forwarding = 0,
180 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
181 .mtu6 = IPV6_MIN_MTU,
182 .accept_ra = 1,
183 .accept_redirects = 1,
184 .autoconf = 1,
185 .dad_transmits = 1,
186 .rtr_solicits = MAX_RTR_SOLICITATIONS,
187 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
188 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
189 #ifdef CONFIG_IPV6_PRIVACY
190 .use_tempaddr = 0,
191 .temp_valid_lft = TEMP_VALID_LIFETIME,
192 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
193 .regen_max_retry = REGEN_MAX_RETRY,
194 .max_desync_factor = MAX_DESYNC_FACTOR,
195 #endif
196 .max_addresses = IPV6_MAX_ADDRESSES,
197 .accept_ra_defrtr = 1,
198 .accept_ra_pinfo = 1,
199 #ifdef CONFIG_IPV6_ROUTER_PREF
200 .accept_ra_rtr_pref = 1,
201 .rtr_probe_interval = 60 * HZ,
202 #ifdef CONFIG_IPV6_ROUTE_INFO
203 .accept_ra_rt_info_max_plen = 0,
204 #endif
205 #endif
206 .proxy_ndp = 0,
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 __be32 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 static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
319 {
320 struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
321 kfree(idev);
322 }
323
324 void in6_dev_finish_destroy(struct inet6_dev *idev)
325 {
326 struct net_device *dev = idev->dev;
327 BUG_TRAP(idev->addr_list==NULL);
328 BUG_TRAP(idev->mc_list==NULL);
329 #ifdef NET_REFCNT_DEBUG
330 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
331 #endif
332 dev_put(dev);
333 if (!idev->dead) {
334 printk("Freeing alive inet6 device %p\n", idev);
335 return;
336 }
337 snmp6_free_dev(idev);
338 call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
339 }
340
341 static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
342 {
343 struct inet6_dev *ndev;
344 struct in6_addr maddr;
345
346 ASSERT_RTNL();
347
348 if (dev->mtu < IPV6_MIN_MTU)
349 return NULL;
350
351 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
352
353 if (ndev == NULL)
354 return NULL;
355
356 rwlock_init(&ndev->lock);
357 ndev->dev = dev;
358 memcpy(&ndev->cnf, &ipv6_devconf_dflt, sizeof(ndev->cnf));
359 ndev->cnf.mtu6 = dev->mtu;
360 ndev->cnf.sysctl = NULL;
361 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
362 if (ndev->nd_parms == NULL) {
363 kfree(ndev);
364 return NULL;
365 }
366 /* We refer to the device */
367 dev_hold(dev);
368
369 if (snmp6_alloc_dev(ndev) < 0) {
370 ADBG((KERN_WARNING
371 "%s(): cannot allocate memory for statistics; dev=%s.\n",
372 __FUNCTION__, dev->name));
373 neigh_parms_release(&nd_tbl, ndev->nd_parms);
374 ndev->dead = 1;
375 in6_dev_finish_destroy(ndev);
376 return NULL;
377 }
378
379 if (snmp6_register_dev(ndev) < 0) {
380 ADBG((KERN_WARNING
381 "%s(): cannot create /proc/net/dev_snmp6/%s\n",
382 __FUNCTION__, dev->name));
383 neigh_parms_release(&nd_tbl, ndev->nd_parms);
384 ndev->dead = 1;
385 in6_dev_finish_destroy(ndev);
386 return NULL;
387 }
388
389 /* One reference from device. We must do this before
390 * we invoke __ipv6_regen_rndid().
391 */
392 in6_dev_hold(ndev);
393
394 #ifdef CONFIG_IPV6_PRIVACY
395 init_timer(&ndev->regen_timer);
396 ndev->regen_timer.function = ipv6_regen_rndid;
397 ndev->regen_timer.data = (unsigned long) ndev;
398 if ((dev->flags&IFF_LOOPBACK) ||
399 dev->type == ARPHRD_TUNNEL ||
400 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
401 dev->type == ARPHRD_SIT ||
402 #endif
403 dev->type == ARPHRD_NONE) {
404 printk(KERN_INFO
405 "%s: Disabled Privacy Extensions\n",
406 dev->name);
407 ndev->cnf.use_tempaddr = -1;
408 } else {
409 in6_dev_hold(ndev);
410 ipv6_regen_rndid((unsigned long) ndev);
411 }
412 #endif
413
414 if (netif_carrier_ok(dev))
415 ndev->if_flags |= IF_READY;
416
417
418 ipv6_mc_init_dev(ndev);
419 ndev->tstamp = jiffies;
420 #ifdef CONFIG_SYSCTL
421 neigh_sysctl_register(dev, ndev->nd_parms, NET_IPV6,
422 NET_IPV6_NEIGH, "ipv6",
423 &ndisc_ifinfo_sysctl_change,
424 NULL);
425 addrconf_sysctl_register(ndev, &ndev->cnf);
426 #endif
427 /* protected by rtnl_lock */
428 rcu_assign_pointer(dev->ip6_ptr, ndev);
429
430 /* Join all-node multicast group */
431 ipv6_addr_all_nodes(&maddr);
432 ipv6_dev_mc_inc(dev, &maddr);
433
434 return ndev;
435 }
436
437 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
438 {
439 struct inet6_dev *idev;
440
441 ASSERT_RTNL();
442
443 if ((idev = __in6_dev_get(dev)) == NULL) {
444 if ((idev = ipv6_add_dev(dev)) == NULL)
445 return NULL;
446 }
447
448 if (dev->flags&IFF_UP)
449 ipv6_mc_up(idev);
450 return idev;
451 }
452
453 #ifdef CONFIG_SYSCTL
454 static void dev_forward_change(struct inet6_dev *idev)
455 {
456 struct net_device *dev;
457 struct inet6_ifaddr *ifa;
458 struct in6_addr addr;
459
460 if (!idev)
461 return;
462 dev = idev->dev;
463 if (dev && (dev->flags & IFF_MULTICAST)) {
464 ipv6_addr_all_routers(&addr);
465
466 if (idev->cnf.forwarding)
467 ipv6_dev_mc_inc(dev, &addr);
468 else
469 ipv6_dev_mc_dec(dev, &addr);
470 }
471 for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
472 if (ifa->flags&IFA_F_TENTATIVE)
473 continue;
474 if (idev->cnf.forwarding)
475 addrconf_join_anycast(ifa);
476 else
477 addrconf_leave_anycast(ifa);
478 }
479 }
480
481
482 static void addrconf_forward_change(void)
483 {
484 struct net_device *dev;
485 struct inet6_dev *idev;
486
487 read_lock(&dev_base_lock);
488 for (dev=dev_base; dev; dev=dev->next) {
489 rcu_read_lock();
490 idev = __in6_dev_get(dev);
491 if (idev) {
492 int changed = (!idev->cnf.forwarding) ^ (!ipv6_devconf.forwarding);
493 idev->cnf.forwarding = ipv6_devconf.forwarding;
494 if (changed)
495 dev_forward_change(idev);
496 }
497 rcu_read_unlock();
498 }
499 read_unlock(&dev_base_lock);
500 }
501 #endif
502
503 /* Nobody refers to this ifaddr, destroy it */
504
505 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
506 {
507 BUG_TRAP(ifp->if_next==NULL);
508 BUG_TRAP(ifp->lst_next==NULL);
509 #ifdef NET_REFCNT_DEBUG
510 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
511 #endif
512
513 in6_dev_put(ifp->idev);
514
515 if (del_timer(&ifp->timer))
516 printk("Timer is still running, when freeing ifa=%p\n", ifp);
517
518 if (!ifp->dead) {
519 printk("Freeing alive inet6 address %p\n", ifp);
520 return;
521 }
522 dst_release(&ifp->rt->u.dst);
523
524 kfree(ifp);
525 }
526
527 static void
528 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
529 {
530 struct inet6_ifaddr *ifa, **ifap;
531 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
532
533 /*
534 * Each device address list is sorted in order of scope -
535 * global before linklocal.
536 */
537 for (ifap = &idev->addr_list; (ifa = *ifap) != NULL;
538 ifap = &ifa->if_next) {
539 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
540 break;
541 }
542
543 ifp->if_next = *ifap;
544 *ifap = ifp;
545 }
546
547 /* On success it returns ifp with increased reference count */
548
549 static struct inet6_ifaddr *
550 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
551 int scope, u32 flags)
552 {
553 struct inet6_ifaddr *ifa = NULL;
554 struct rt6_info *rt;
555 int hash;
556 int err = 0;
557
558 rcu_read_lock_bh();
559 if (idev->dead) {
560 err = -ENODEV; /*XXX*/
561 goto out2;
562 }
563
564 write_lock(&addrconf_hash_lock);
565
566 /* Ignore adding duplicate addresses on an interface */
567 if (ipv6_chk_same_addr(addr, idev->dev)) {
568 ADBG(("ipv6_add_addr: already assigned\n"));
569 err = -EEXIST;
570 goto out;
571 }
572
573 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
574
575 if (ifa == NULL) {
576 ADBG(("ipv6_add_addr: malloc failed\n"));
577 err = -ENOBUFS;
578 goto out;
579 }
580
581 rt = addrconf_dst_alloc(idev, addr, 0);
582 if (IS_ERR(rt)) {
583 err = PTR_ERR(rt);
584 goto out;
585 }
586
587 ipv6_addr_copy(&ifa->addr, addr);
588
589 spin_lock_init(&ifa->lock);
590 init_timer(&ifa->timer);
591 ifa->timer.data = (unsigned long) ifa;
592 ifa->scope = scope;
593 ifa->prefix_len = pfxlen;
594 ifa->flags = flags | IFA_F_TENTATIVE;
595 ifa->cstamp = ifa->tstamp = jiffies;
596
597 ifa->rt = rt;
598
599 ifa->idev = idev;
600 in6_dev_hold(idev);
601 /* For caller */
602 in6_ifa_hold(ifa);
603
604 /* Add to big hash table */
605 hash = ipv6_addr_hash(addr);
606
607 ifa->lst_next = inet6_addr_lst[hash];
608 inet6_addr_lst[hash] = ifa;
609 in6_ifa_hold(ifa);
610 write_unlock(&addrconf_hash_lock);
611
612 write_lock(&idev->lock);
613 /* Add to inet6_dev unicast addr list. */
614 ipv6_link_dev_addr(idev, ifa);
615
616 #ifdef CONFIG_IPV6_PRIVACY
617 if (ifa->flags&IFA_F_TEMPORARY) {
618 ifa->tmp_next = idev->tempaddr_list;
619 idev->tempaddr_list = ifa;
620 in6_ifa_hold(ifa);
621 }
622 #endif
623
624 in6_ifa_hold(ifa);
625 write_unlock(&idev->lock);
626 out2:
627 rcu_read_unlock_bh();
628
629 if (likely(err == 0))
630 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
631 else {
632 kfree(ifa);
633 ifa = ERR_PTR(err);
634 }
635
636 return ifa;
637 out:
638 write_unlock(&addrconf_hash_lock);
639 goto out2;
640 }
641
642 /* This function wants to get referenced ifp and releases it before return */
643
644 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
645 {
646 struct inet6_ifaddr *ifa, **ifap;
647 struct inet6_dev *idev = ifp->idev;
648 int hash;
649 int deleted = 0, onlink = 0;
650 unsigned long expires = jiffies;
651
652 hash = ipv6_addr_hash(&ifp->addr);
653
654 ifp->dead = 1;
655
656 write_lock_bh(&addrconf_hash_lock);
657 for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
658 ifap = &ifa->lst_next) {
659 if (ifa == ifp) {
660 *ifap = ifa->lst_next;
661 __in6_ifa_put(ifp);
662 ifa->lst_next = NULL;
663 break;
664 }
665 }
666 write_unlock_bh(&addrconf_hash_lock);
667
668 write_lock_bh(&idev->lock);
669 #ifdef CONFIG_IPV6_PRIVACY
670 if (ifp->flags&IFA_F_TEMPORARY) {
671 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
672 ifap = &ifa->tmp_next) {
673 if (ifa == ifp) {
674 *ifap = ifa->tmp_next;
675 if (ifp->ifpub) {
676 in6_ifa_put(ifp->ifpub);
677 ifp->ifpub = NULL;
678 }
679 __in6_ifa_put(ifp);
680 ifa->tmp_next = NULL;
681 break;
682 }
683 }
684 }
685 #endif
686
687 for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
688 if (ifa == ifp) {
689 *ifap = ifa->if_next;
690 __in6_ifa_put(ifp);
691 ifa->if_next = NULL;
692 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
693 break;
694 deleted = 1;
695 continue;
696 } else if (ifp->flags & IFA_F_PERMANENT) {
697 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
698 ifp->prefix_len)) {
699 if (ifa->flags & IFA_F_PERMANENT) {
700 onlink = 1;
701 if (deleted)
702 break;
703 } else {
704 unsigned long lifetime;
705
706 if (!onlink)
707 onlink = -1;
708
709 spin_lock(&ifa->lock);
710 lifetime = min_t(unsigned long,
711 ifa->valid_lft, 0x7fffffffUL/HZ);
712 if (time_before(expires,
713 ifa->tstamp + lifetime * HZ))
714 expires = ifa->tstamp + lifetime * HZ;
715 spin_unlock(&ifa->lock);
716 }
717 }
718 }
719 ifap = &ifa->if_next;
720 }
721 write_unlock_bh(&idev->lock);
722
723 ipv6_ifa_notify(RTM_DELADDR, ifp);
724
725 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
726
727 addrconf_del_timer(ifp);
728
729 /*
730 * Purge or update corresponding prefix
731 *
732 * 1) we don't purge prefix here if address was not permanent.
733 * prefix is managed by its own lifetime.
734 * 2) if there're no addresses, delete prefix.
735 * 3) if there're still other permanent address(es),
736 * corresponding prefix is still permanent.
737 * 4) otherwise, update prefix lifetime to the
738 * longest valid lifetime among the corresponding
739 * addresses on the device.
740 * Note: subsequent RA will update lifetime.
741 *
742 * --yoshfuji
743 */
744 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
745 struct in6_addr prefix;
746 struct rt6_info *rt;
747
748 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
749 rt = rt6_lookup(&prefix, NULL, ifp->idev->dev->ifindex, 1);
750
751 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
752 if (onlink == 0) {
753 ip6_del_rt(rt);
754 rt = NULL;
755 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
756 rt->rt6i_expires = expires;
757 rt->rt6i_flags |= RTF_EXPIRES;
758 }
759 }
760 dst_release(&rt->u.dst);
761 }
762
763 in6_ifa_put(ifp);
764 }
765
766 #ifdef CONFIG_IPV6_PRIVACY
767 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
768 {
769 struct inet6_dev *idev = ifp->idev;
770 struct in6_addr addr, *tmpaddr;
771 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
772 int tmp_plen;
773 int ret = 0;
774 int max_addresses;
775
776 write_lock(&idev->lock);
777 if (ift) {
778 spin_lock_bh(&ift->lock);
779 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
780 spin_unlock_bh(&ift->lock);
781 tmpaddr = &addr;
782 } else {
783 tmpaddr = NULL;
784 }
785 retry:
786 in6_dev_hold(idev);
787 if (idev->cnf.use_tempaddr <= 0) {
788 write_unlock(&idev->lock);
789 printk(KERN_INFO
790 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
791 in6_dev_put(idev);
792 ret = -1;
793 goto out;
794 }
795 spin_lock_bh(&ifp->lock);
796 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
797 idev->cnf.use_tempaddr = -1; /*XXX*/
798 spin_unlock_bh(&ifp->lock);
799 write_unlock(&idev->lock);
800 printk(KERN_WARNING
801 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
802 in6_dev_put(idev);
803 ret = -1;
804 goto out;
805 }
806 in6_ifa_hold(ifp);
807 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
808 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
809 spin_unlock_bh(&ifp->lock);
810 write_unlock(&idev->lock);
811 printk(KERN_WARNING
812 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
813 in6_ifa_put(ifp);
814 in6_dev_put(idev);
815 ret = -1;
816 goto out;
817 }
818 memcpy(&addr.s6_addr[8], idev->rndid, 8);
819 tmp_valid_lft = min_t(__u32,
820 ifp->valid_lft,
821 idev->cnf.temp_valid_lft);
822 tmp_prefered_lft = min_t(__u32,
823 ifp->prefered_lft,
824 idev->cnf.temp_prefered_lft - desync_factor / HZ);
825 tmp_plen = ifp->prefix_len;
826 max_addresses = idev->cnf.max_addresses;
827 tmp_cstamp = ifp->cstamp;
828 tmp_tstamp = ifp->tstamp;
829 spin_unlock_bh(&ifp->lock);
830
831 write_unlock(&idev->lock);
832 ift = !max_addresses ||
833 ipv6_count_addresses(idev) < max_addresses ?
834 ipv6_add_addr(idev, &addr, tmp_plen,
835 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK, IFA_F_TEMPORARY) : NULL;
836 if (!ift || IS_ERR(ift)) {
837 in6_ifa_put(ifp);
838 in6_dev_put(idev);
839 printk(KERN_INFO
840 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
841 tmpaddr = &addr;
842 write_lock(&idev->lock);
843 goto retry;
844 }
845
846 spin_lock_bh(&ift->lock);
847 ift->ifpub = ifp;
848 ift->valid_lft = tmp_valid_lft;
849 ift->prefered_lft = tmp_prefered_lft;
850 ift->cstamp = tmp_cstamp;
851 ift->tstamp = tmp_tstamp;
852 spin_unlock_bh(&ift->lock);
853
854 addrconf_dad_start(ift, 0);
855 in6_ifa_put(ift);
856 in6_dev_put(idev);
857 out:
858 return ret;
859 }
860 #endif
861
862 /*
863 * Choose an appropriate source address (RFC3484)
864 */
865 struct ipv6_saddr_score {
866 int addr_type;
867 unsigned int attrs;
868 int matchlen;
869 int scope;
870 unsigned int rule;
871 };
872
873 #define IPV6_SADDR_SCORE_LOCAL 0x0001
874 #define IPV6_SADDR_SCORE_PREFERRED 0x0004
875 #define IPV6_SADDR_SCORE_HOA 0x0008
876 #define IPV6_SADDR_SCORE_OIF 0x0010
877 #define IPV6_SADDR_SCORE_LABEL 0x0020
878 #define IPV6_SADDR_SCORE_PRIVACY 0x0040
879
880 static int inline ipv6_saddr_preferred(int type)
881 {
882 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
883 IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
884 return 1;
885 return 0;
886 }
887
888 /* static matching label */
889 static int inline ipv6_saddr_label(const struct in6_addr *addr, int type)
890 {
891 /*
892 * prefix (longest match) label
893 * -----------------------------
894 * ::1/128 0
895 * ::/0 1
896 * 2002::/16 2
897 * ::/96 3
898 * ::ffff:0:0/96 4
899 * fc00::/7 5
900 * 2001::/32 6
901 */
902 if (type & IPV6_ADDR_LOOPBACK)
903 return 0;
904 else if (type & IPV6_ADDR_COMPATv4)
905 return 3;
906 else if (type & IPV6_ADDR_MAPPED)
907 return 4;
908 else if (addr->s6_addr32[0] == htonl(0x20010000))
909 return 6;
910 else if (addr->s6_addr16[0] == htons(0x2002))
911 return 2;
912 else if ((addr->s6_addr[0] & 0xfe) == 0xfc)
913 return 5;
914 return 1;
915 }
916
917 int ipv6_dev_get_saddr(struct net_device *daddr_dev,
918 struct in6_addr *daddr, struct in6_addr *saddr)
919 {
920 struct ipv6_saddr_score hiscore;
921 struct inet6_ifaddr *ifa_result = NULL;
922 int daddr_type = __ipv6_addr_type(daddr);
923 int daddr_scope = __ipv6_addr_src_scope(daddr_type);
924 u32 daddr_label = ipv6_saddr_label(daddr, daddr_type);
925 struct net_device *dev;
926
927 memset(&hiscore, 0, sizeof(hiscore));
928
929 read_lock(&dev_base_lock);
930 rcu_read_lock();
931
932 for (dev = dev_base; dev; dev=dev->next) {
933 struct inet6_dev *idev;
934 struct inet6_ifaddr *ifa;
935
936 /* Rule 0: Candidate Source Address (section 4)
937 * - multicast and link-local destination address,
938 * the set of candidate source address MUST only
939 * include addresses assigned to interfaces
940 * belonging to the same link as the outgoing
941 * interface.
942 * (- For site-local destination addresses, the
943 * set of candidate source addresses MUST only
944 * include addresses assigned to interfaces
945 * belonging to the same site as the outgoing
946 * interface.)
947 */
948 if ((daddr_type & IPV6_ADDR_MULTICAST ||
949 daddr_scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
950 daddr_dev && dev != daddr_dev)
951 continue;
952
953 idev = __in6_dev_get(dev);
954 if (!idev)
955 continue;
956
957 read_lock_bh(&idev->lock);
958 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
959 struct ipv6_saddr_score score;
960
961 score.addr_type = __ipv6_addr_type(&ifa->addr);
962
963 /* Rule 0:
964 * - Tentative Address (RFC2462 section 5.4)
965 * - A tentative address is not considered
966 * "assigned to an interface" in the traditional
967 * sense.
968 * - Candidate Source Address (section 4)
969 * - In any case, anycast addresses, multicast
970 * addresses, and the unspecified address MUST
971 * NOT be included in a candidate set.
972 */
973 if (ifa->flags & IFA_F_TENTATIVE)
974 continue;
975 if (unlikely(score.addr_type == IPV6_ADDR_ANY ||
976 score.addr_type & IPV6_ADDR_MULTICAST)) {
977 LIMIT_NETDEBUG(KERN_DEBUG
978 "ADDRCONF: unspecified / multicast address"
979 "assigned as unicast address on %s",
980 dev->name);
981 continue;
982 }
983
984 score.attrs = 0;
985 score.matchlen = 0;
986 score.scope = 0;
987 score.rule = 0;
988
989 if (ifa_result == NULL) {
990 /* record it if the first available entry */
991 goto record_it;
992 }
993
994 /* Rule 1: Prefer same address */
995 if (hiscore.rule < 1) {
996 if (ipv6_addr_equal(&ifa_result->addr, daddr))
997 hiscore.attrs |= IPV6_SADDR_SCORE_LOCAL;
998 hiscore.rule++;
999 }
1000 if (ipv6_addr_equal(&ifa->addr, daddr)) {
1001 score.attrs |= IPV6_SADDR_SCORE_LOCAL;
1002 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)) {
1003 score.rule = 1;
1004 goto record_it;
1005 }
1006 } else {
1007 if (hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)
1008 continue;
1009 }
1010
1011 /* Rule 2: Prefer appropriate scope */
1012 if (hiscore.rule < 2) {
1013 hiscore.scope = __ipv6_addr_src_scope(hiscore.addr_type);
1014 hiscore.rule++;
1015 }
1016 score.scope = __ipv6_addr_src_scope(score.addr_type);
1017 if (hiscore.scope < score.scope) {
1018 if (hiscore.scope < daddr_scope) {
1019 score.rule = 2;
1020 goto record_it;
1021 } else
1022 continue;
1023 } else if (score.scope < hiscore.scope) {
1024 if (score.scope < daddr_scope)
1025 break; /* addresses sorted by scope */
1026 else {
1027 score.rule = 2;
1028 goto record_it;
1029 }
1030 }
1031
1032 /* Rule 3: Avoid deprecated address */
1033 if (hiscore.rule < 3) {
1034 if (ipv6_saddr_preferred(hiscore.addr_type) ||
1035 !(ifa_result->flags & IFA_F_DEPRECATED))
1036 hiscore.attrs |= IPV6_SADDR_SCORE_PREFERRED;
1037 hiscore.rule++;
1038 }
1039 if (ipv6_saddr_preferred(score.addr_type) ||
1040 !(ifa->flags & IFA_F_DEPRECATED)) {
1041 score.attrs |= IPV6_SADDR_SCORE_PREFERRED;
1042 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)) {
1043 score.rule = 3;
1044 goto record_it;
1045 }
1046 } else {
1047 if (hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)
1048 continue;
1049 }
1050
1051 /* Rule 4: Prefer home address */
1052 #ifdef CONFIG_IPV6_MIP6
1053 if (hiscore.rule < 4) {
1054 if (ifa_result->flags & IFA_F_HOMEADDRESS)
1055 hiscore.attrs |= IPV6_SADDR_SCORE_HOA;
1056 hiscore.rule++;
1057 }
1058 if (ifa->flags & IFA_F_HOMEADDRESS) {
1059 score.attrs |= IPV6_SADDR_SCORE_HOA;
1060 if (!(ifa_result->flags & IFA_F_HOMEADDRESS)) {
1061 score.rule = 4;
1062 goto record_it;
1063 }
1064 } else {
1065 if (hiscore.attrs & IPV6_SADDR_SCORE_HOA)
1066 continue;
1067 }
1068 #else
1069 if (hiscore.rule < 4)
1070 hiscore.rule++;
1071 #endif
1072
1073 /* Rule 5: Prefer outgoing interface */
1074 if (hiscore.rule < 5) {
1075 if (daddr_dev == NULL ||
1076 daddr_dev == ifa_result->idev->dev)
1077 hiscore.attrs |= IPV6_SADDR_SCORE_OIF;
1078 hiscore.rule++;
1079 }
1080 if (daddr_dev == NULL ||
1081 daddr_dev == ifa->idev->dev) {
1082 score.attrs |= IPV6_SADDR_SCORE_OIF;
1083 if (!(hiscore.attrs & IPV6_SADDR_SCORE_OIF)) {
1084 score.rule = 5;
1085 goto record_it;
1086 }
1087 } else {
1088 if (hiscore.attrs & IPV6_SADDR_SCORE_OIF)
1089 continue;
1090 }
1091
1092 /* Rule 6: Prefer matching label */
1093 if (hiscore.rule < 6) {
1094 if (ipv6_saddr_label(&ifa_result->addr, hiscore.addr_type) == daddr_label)
1095 hiscore.attrs |= IPV6_SADDR_SCORE_LABEL;
1096 hiscore.rule++;
1097 }
1098 if (ipv6_saddr_label(&ifa->addr, score.addr_type) == daddr_label) {
1099 score.attrs |= IPV6_SADDR_SCORE_LABEL;
1100 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LABEL)) {
1101 score.rule = 6;
1102 goto record_it;
1103 }
1104 } else {
1105 if (hiscore.attrs & IPV6_SADDR_SCORE_LABEL)
1106 continue;
1107 }
1108
1109 #ifdef CONFIG_IPV6_PRIVACY
1110 /* Rule 7: Prefer public address
1111 * Note: prefer temprary address if use_tempaddr >= 2
1112 */
1113 if (hiscore.rule < 7) {
1114 if ((!(ifa_result->flags & IFA_F_TEMPORARY)) ^
1115 (ifa_result->idev->cnf.use_tempaddr >= 2))
1116 hiscore.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1117 hiscore.rule++;
1118 }
1119 if ((!(ifa->flags & IFA_F_TEMPORARY)) ^
1120 (ifa->idev->cnf.use_tempaddr >= 2)) {
1121 score.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1122 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)) {
1123 score.rule = 7;
1124 goto record_it;
1125 }
1126 } else {
1127 if (hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)
1128 continue;
1129 }
1130 #else
1131 if (hiscore.rule < 7)
1132 hiscore.rule++;
1133 #endif
1134 /* Rule 8: Use longest matching prefix */
1135 if (hiscore.rule < 8) {
1136 hiscore.matchlen = ipv6_addr_diff(&ifa_result->addr, daddr);
1137 hiscore.rule++;
1138 }
1139 score.matchlen = ipv6_addr_diff(&ifa->addr, daddr);
1140 if (score.matchlen > hiscore.matchlen) {
1141 score.rule = 8;
1142 goto record_it;
1143 }
1144 #if 0
1145 else if (score.matchlen < hiscore.matchlen)
1146 continue;
1147 #endif
1148
1149 /* Final Rule: choose first available one */
1150 continue;
1151 record_it:
1152 if (ifa_result)
1153 in6_ifa_put(ifa_result);
1154 in6_ifa_hold(ifa);
1155 ifa_result = ifa;
1156 hiscore = score;
1157 }
1158 read_unlock_bh(&idev->lock);
1159 }
1160 rcu_read_unlock();
1161 read_unlock(&dev_base_lock);
1162
1163 if (!ifa_result)
1164 return -EADDRNOTAVAIL;
1165
1166 ipv6_addr_copy(saddr, &ifa_result->addr);
1167 in6_ifa_put(ifa_result);
1168 return 0;
1169 }
1170
1171
1172 int ipv6_get_saddr(struct dst_entry *dst,
1173 struct in6_addr *daddr, struct in6_addr *saddr)
1174 {
1175 return ipv6_dev_get_saddr(dst ? ip6_dst_idev(dst)->dev : NULL, daddr, saddr);
1176 }
1177
1178
1179 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr)
1180 {
1181 struct inet6_dev *idev;
1182 int err = -EADDRNOTAVAIL;
1183
1184 rcu_read_lock();
1185 if ((idev = __in6_dev_get(dev)) != NULL) {
1186 struct inet6_ifaddr *ifp;
1187
1188 read_lock_bh(&idev->lock);
1189 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1190 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1191 ipv6_addr_copy(addr, &ifp->addr);
1192 err = 0;
1193 break;
1194 }
1195 }
1196 read_unlock_bh(&idev->lock);
1197 }
1198 rcu_read_unlock();
1199 return err;
1200 }
1201
1202 static int ipv6_count_addresses(struct inet6_dev *idev)
1203 {
1204 int cnt = 0;
1205 struct inet6_ifaddr *ifp;
1206
1207 read_lock_bh(&idev->lock);
1208 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1209 cnt++;
1210 read_unlock_bh(&idev->lock);
1211 return cnt;
1212 }
1213
1214 int ipv6_chk_addr(struct in6_addr *addr, struct net_device *dev, int strict)
1215 {
1216 struct inet6_ifaddr * ifp;
1217 u8 hash = ipv6_addr_hash(addr);
1218
1219 read_lock_bh(&addrconf_hash_lock);
1220 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1221 if (ipv6_addr_equal(&ifp->addr, addr) &&
1222 !(ifp->flags&IFA_F_TENTATIVE)) {
1223 if (dev == NULL || ifp->idev->dev == dev ||
1224 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1225 break;
1226 }
1227 }
1228 read_unlock_bh(&addrconf_hash_lock);
1229 return ifp != NULL;
1230 }
1231
1232 static
1233 int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev)
1234 {
1235 struct inet6_ifaddr * ifp;
1236 u8 hash = ipv6_addr_hash(addr);
1237
1238 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1239 if (ipv6_addr_equal(&ifp->addr, addr)) {
1240 if (dev == NULL || ifp->idev->dev == dev)
1241 break;
1242 }
1243 }
1244 return ifp != NULL;
1245 }
1246
1247 struct inet6_ifaddr * ipv6_get_ifaddr(struct in6_addr *addr, struct net_device *dev, int strict)
1248 {
1249 struct inet6_ifaddr * ifp;
1250 u8 hash = ipv6_addr_hash(addr);
1251
1252 read_lock_bh(&addrconf_hash_lock);
1253 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1254 if (ipv6_addr_equal(&ifp->addr, addr)) {
1255 if (dev == NULL || ifp->idev->dev == dev ||
1256 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1257 in6_ifa_hold(ifp);
1258 break;
1259 }
1260 }
1261 }
1262 read_unlock_bh(&addrconf_hash_lock);
1263
1264 return ifp;
1265 }
1266
1267 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1268 {
1269 const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
1270 const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
1271 __be32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
1272 __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1273 int sk_ipv6only = ipv6_only_sock(sk);
1274 int sk2_ipv6only = inet_v6_ipv6only(sk2);
1275 int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1276 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1277
1278 if (!sk2_rcv_saddr && !sk_ipv6only)
1279 return 1;
1280
1281 if (addr_type2 == IPV6_ADDR_ANY &&
1282 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1283 return 1;
1284
1285 if (addr_type == IPV6_ADDR_ANY &&
1286 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1287 return 1;
1288
1289 if (sk2_rcv_saddr6 &&
1290 ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1291 return 1;
1292
1293 if (addr_type == IPV6_ADDR_MAPPED &&
1294 !sk2_ipv6only &&
1295 (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1296 return 1;
1297
1298 return 0;
1299 }
1300
1301 /* Gets referenced address, destroys ifaddr */
1302
1303 static void addrconf_dad_stop(struct inet6_ifaddr *ifp)
1304 {
1305 if (ifp->flags&IFA_F_PERMANENT) {
1306 spin_lock_bh(&ifp->lock);
1307 addrconf_del_timer(ifp);
1308 ifp->flags |= IFA_F_TENTATIVE;
1309 spin_unlock_bh(&ifp->lock);
1310 in6_ifa_put(ifp);
1311 #ifdef CONFIG_IPV6_PRIVACY
1312 } else if (ifp->flags&IFA_F_TEMPORARY) {
1313 struct inet6_ifaddr *ifpub;
1314 spin_lock_bh(&ifp->lock);
1315 ifpub = ifp->ifpub;
1316 if (ifpub) {
1317 in6_ifa_hold(ifpub);
1318 spin_unlock_bh(&ifp->lock);
1319 ipv6_create_tempaddr(ifpub, ifp);
1320 in6_ifa_put(ifpub);
1321 } else {
1322 spin_unlock_bh(&ifp->lock);
1323 }
1324 ipv6_del_addr(ifp);
1325 #endif
1326 } else
1327 ipv6_del_addr(ifp);
1328 }
1329
1330 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1331 {
1332 if (net_ratelimit())
1333 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1334 addrconf_dad_stop(ifp);
1335 }
1336
1337 /* Join to solicited addr multicast group. */
1338
1339 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1340 {
1341 struct in6_addr maddr;
1342
1343 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1344 return;
1345
1346 addrconf_addr_solict_mult(addr, &maddr);
1347 ipv6_dev_mc_inc(dev, &maddr);
1348 }
1349
1350 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1351 {
1352 struct in6_addr maddr;
1353
1354 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1355 return;
1356
1357 addrconf_addr_solict_mult(addr, &maddr);
1358 __ipv6_dev_mc_dec(idev, &maddr);
1359 }
1360
1361 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1362 {
1363 struct in6_addr addr;
1364 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1365 if (ipv6_addr_any(&addr))
1366 return;
1367 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1368 }
1369
1370 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1371 {
1372 struct in6_addr addr;
1373 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1374 if (ipv6_addr_any(&addr))
1375 return;
1376 __ipv6_dev_ac_dec(ifp->idev, &addr);
1377 }
1378
1379 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1380 {
1381 if (dev->addr_len != ETH_ALEN)
1382 return -1;
1383 memcpy(eui, dev->dev_addr, 3);
1384 memcpy(eui + 5, dev->dev_addr + 3, 3);
1385
1386 /*
1387 * The zSeries OSA network cards can be shared among various
1388 * OS instances, but the OSA cards have only one MAC address.
1389 * This leads to duplicate address conflicts in conjunction
1390 * with IPv6 if more than one instance uses the same card.
1391 *
1392 * The driver for these cards can deliver a unique 16-bit
1393 * identifier for each instance sharing the same card. It is
1394 * placed instead of 0xFFFE in the interface identifier. The
1395 * "u" bit of the interface identifier is not inverted in this
1396 * case. Hence the resulting interface identifier has local
1397 * scope according to RFC2373.
1398 */
1399 if (dev->dev_id) {
1400 eui[3] = (dev->dev_id >> 8) & 0xFF;
1401 eui[4] = dev->dev_id & 0xFF;
1402 } else {
1403 eui[3] = 0xFF;
1404 eui[4] = 0xFE;
1405 eui[0] ^= 2;
1406 }
1407 return 0;
1408 }
1409
1410 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1411 {
1412 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1413 if (dev->addr_len != ARCNET_ALEN)
1414 return -1;
1415 memset(eui, 0, 7);
1416 eui[7] = *(u8*)dev->dev_addr;
1417 return 0;
1418 }
1419
1420 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1421 {
1422 if (dev->addr_len != INFINIBAND_ALEN)
1423 return -1;
1424 memcpy(eui, dev->dev_addr + 12, 8);
1425 eui[0] |= 2;
1426 return 0;
1427 }
1428
1429 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1430 {
1431 switch (dev->type) {
1432 case ARPHRD_ETHER:
1433 case ARPHRD_FDDI:
1434 case ARPHRD_IEEE802_TR:
1435 return addrconf_ifid_eui48(eui, dev);
1436 case ARPHRD_ARCNET:
1437 return addrconf_ifid_arcnet(eui, dev);
1438 case ARPHRD_INFINIBAND:
1439 return addrconf_ifid_infiniband(eui, dev);
1440 }
1441 return -1;
1442 }
1443
1444 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1445 {
1446 int err = -1;
1447 struct inet6_ifaddr *ifp;
1448
1449 read_lock_bh(&idev->lock);
1450 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1451 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1452 memcpy(eui, ifp->addr.s6_addr+8, 8);
1453 err = 0;
1454 break;
1455 }
1456 }
1457 read_unlock_bh(&idev->lock);
1458 return err;
1459 }
1460
1461 #ifdef CONFIG_IPV6_PRIVACY
1462 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1463 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1464 {
1465 regen:
1466 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1467 idev->rndid[0] &= ~0x02;
1468
1469 /*
1470 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1471 * check if generated address is not inappropriate
1472 *
1473 * - Reserved subnet anycast (RFC 2526)
1474 * 11111101 11....11 1xxxxxxx
1475 * - ISATAP (draft-ietf-ngtrans-isatap-13.txt) 5.1
1476 * 00-00-5E-FE-xx-xx-xx-xx
1477 * - value 0
1478 * - XXX: already assigned to an address on the device
1479 */
1480 if (idev->rndid[0] == 0xfd &&
1481 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1482 (idev->rndid[7]&0x80))
1483 goto regen;
1484 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1485 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1486 goto regen;
1487 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1488 goto regen;
1489 }
1490
1491 return 0;
1492 }
1493
1494 static void ipv6_regen_rndid(unsigned long data)
1495 {
1496 struct inet6_dev *idev = (struct inet6_dev *) data;
1497 unsigned long expires;
1498
1499 rcu_read_lock_bh();
1500 write_lock_bh(&idev->lock);
1501
1502 if (idev->dead)
1503 goto out;
1504
1505 if (__ipv6_regen_rndid(idev) < 0)
1506 goto out;
1507
1508 expires = jiffies +
1509 idev->cnf.temp_prefered_lft * HZ -
1510 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1511 if (time_before(expires, jiffies)) {
1512 printk(KERN_WARNING
1513 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1514 idev->dev->name);
1515 goto out;
1516 }
1517
1518 if (!mod_timer(&idev->regen_timer, expires))
1519 in6_dev_hold(idev);
1520
1521 out:
1522 write_unlock_bh(&idev->lock);
1523 rcu_read_unlock_bh();
1524 in6_dev_put(idev);
1525 }
1526
1527 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1528 int ret = 0;
1529
1530 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1531 ret = __ipv6_regen_rndid(idev);
1532 return ret;
1533 }
1534 #endif
1535
1536 /*
1537 * Add prefix route.
1538 */
1539
1540 static void
1541 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1542 unsigned long expires, u32 flags)
1543 {
1544 struct fib6_config cfg = {
1545 .fc_table = RT6_TABLE_PREFIX,
1546 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1547 .fc_ifindex = dev->ifindex,
1548 .fc_expires = expires,
1549 .fc_dst_len = plen,
1550 .fc_flags = RTF_UP | flags,
1551 };
1552
1553 ipv6_addr_copy(&cfg.fc_dst, pfx);
1554
1555 /* Prevent useless cloning on PtP SIT.
1556 This thing is done here expecting that the whole
1557 class of non-broadcast devices need not cloning.
1558 */
1559 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1560 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1561 cfg.fc_flags |= RTF_NONEXTHOP;
1562 #endif
1563
1564 ip6_route_add(&cfg);
1565 }
1566
1567 /* Create "default" multicast route to the interface */
1568
1569 static void addrconf_add_mroute(struct net_device *dev)
1570 {
1571 struct fib6_config cfg = {
1572 .fc_table = RT6_TABLE_LOCAL,
1573 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1574 .fc_ifindex = dev->ifindex,
1575 .fc_dst_len = 8,
1576 .fc_flags = RTF_UP,
1577 };
1578
1579 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1580
1581 ip6_route_add(&cfg);
1582 }
1583
1584 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1585 static void sit_route_add(struct net_device *dev)
1586 {
1587 struct fib6_config cfg = {
1588 .fc_table = RT6_TABLE_MAIN,
1589 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1590 .fc_ifindex = dev->ifindex,
1591 .fc_dst_len = 96,
1592 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1593 };
1594
1595 /* prefix length - 96 bits "::d.d.d.d" */
1596 ip6_route_add(&cfg);
1597 }
1598 #endif
1599
1600 static void addrconf_add_lroute(struct net_device *dev)
1601 {
1602 struct in6_addr addr;
1603
1604 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1605 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1606 }
1607
1608 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1609 {
1610 struct inet6_dev *idev;
1611
1612 ASSERT_RTNL();
1613
1614 if ((idev = ipv6_find_idev(dev)) == NULL)
1615 return NULL;
1616
1617 /* Add default multicast route */
1618 addrconf_add_mroute(dev);
1619
1620 /* Add link local route */
1621 addrconf_add_lroute(dev);
1622 return idev;
1623 }
1624
1625 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1626 {
1627 struct prefix_info *pinfo;
1628 __u32 valid_lft;
1629 __u32 prefered_lft;
1630 int addr_type;
1631 unsigned long rt_expires;
1632 struct inet6_dev *in6_dev;
1633
1634 pinfo = (struct prefix_info *) opt;
1635
1636 if (len < sizeof(struct prefix_info)) {
1637 ADBG(("addrconf: prefix option too short\n"));
1638 return;
1639 }
1640
1641 /*
1642 * Validation checks ([ADDRCONF], page 19)
1643 */
1644
1645 addr_type = ipv6_addr_type(&pinfo->prefix);
1646
1647 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1648 return;
1649
1650 valid_lft = ntohl(pinfo->valid);
1651 prefered_lft = ntohl(pinfo->prefered);
1652
1653 if (prefered_lft > valid_lft) {
1654 if (net_ratelimit())
1655 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1656 return;
1657 }
1658
1659 in6_dev = in6_dev_get(dev);
1660
1661 if (in6_dev == NULL) {
1662 if (net_ratelimit())
1663 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1664 return;
1665 }
1666
1667 /*
1668 * Two things going on here:
1669 * 1) Add routes for on-link prefixes
1670 * 2) Configure prefixes with the auto flag set
1671 */
1672
1673 /* Avoid arithmetic overflow. Really, we could
1674 save rt_expires in seconds, likely valid_lft,
1675 but it would require division in fib gc, that it
1676 not good.
1677 */
1678 if (valid_lft >= 0x7FFFFFFF/HZ)
1679 rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ);
1680 else
1681 rt_expires = valid_lft * HZ;
1682
1683 /*
1684 * We convert this (in jiffies) to clock_t later.
1685 * Avoid arithmetic overflow there as well.
1686 * Overflow can happen only if HZ < USER_HZ.
1687 */
1688 if (HZ < USER_HZ && rt_expires > 0x7FFFFFFF / USER_HZ)
1689 rt_expires = 0x7FFFFFFF / USER_HZ;
1690
1691 if (pinfo->onlink) {
1692 struct rt6_info *rt;
1693 rt = rt6_lookup(&pinfo->prefix, NULL, dev->ifindex, 1);
1694
1695 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
1696 if (rt->rt6i_flags&RTF_EXPIRES) {
1697 if (valid_lft == 0) {
1698 ip6_del_rt(rt);
1699 rt = NULL;
1700 } else {
1701 rt->rt6i_expires = jiffies + rt_expires;
1702 }
1703 }
1704 } else if (valid_lft) {
1705 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1706 dev, jiffies_to_clock_t(rt_expires), RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT);
1707 }
1708 if (rt)
1709 dst_release(&rt->u.dst);
1710 }
1711
1712 /* Try to figure out our local address for this prefix */
1713
1714 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1715 struct inet6_ifaddr * ifp;
1716 struct in6_addr addr;
1717 int create = 0, update_lft = 0;
1718
1719 if (pinfo->prefix_len == 64) {
1720 memcpy(&addr, &pinfo->prefix, 8);
1721 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1722 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1723 in6_dev_put(in6_dev);
1724 return;
1725 }
1726 goto ok;
1727 }
1728 if (net_ratelimit())
1729 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1730 pinfo->prefix_len);
1731 in6_dev_put(in6_dev);
1732 return;
1733
1734 ok:
1735
1736 ifp = ipv6_get_ifaddr(&addr, dev, 1);
1737
1738 if (ifp == NULL && valid_lft) {
1739 int max_addresses = in6_dev->cnf.max_addresses;
1740
1741 /* Do not allow to create too much of autoconfigured
1742 * addresses; this would be too easy way to crash kernel.
1743 */
1744 if (!max_addresses ||
1745 ipv6_count_addresses(in6_dev) < max_addresses)
1746 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1747 addr_type&IPV6_ADDR_SCOPE_MASK, 0);
1748
1749 if (!ifp || IS_ERR(ifp)) {
1750 in6_dev_put(in6_dev);
1751 return;
1752 }
1753
1754 update_lft = create = 1;
1755 ifp->cstamp = jiffies;
1756 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1757 }
1758
1759 if (ifp) {
1760 int flags;
1761 unsigned long now;
1762 #ifdef CONFIG_IPV6_PRIVACY
1763 struct inet6_ifaddr *ift;
1764 #endif
1765 u32 stored_lft;
1766
1767 /* update lifetime (RFC2462 5.5.3 e) */
1768 spin_lock(&ifp->lock);
1769 now = jiffies;
1770 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1771 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1772 else
1773 stored_lft = 0;
1774 if (!update_lft && stored_lft) {
1775 if (valid_lft > MIN_VALID_LIFETIME ||
1776 valid_lft > stored_lft)
1777 update_lft = 1;
1778 else if (stored_lft <= MIN_VALID_LIFETIME) {
1779 /* valid_lft <= stored_lft is always true */
1780 /* XXX: IPsec */
1781 update_lft = 0;
1782 } else {
1783 valid_lft = MIN_VALID_LIFETIME;
1784 if (valid_lft < prefered_lft)
1785 prefered_lft = valid_lft;
1786 update_lft = 1;
1787 }
1788 }
1789
1790 if (update_lft) {
1791 ifp->valid_lft = valid_lft;
1792 ifp->prefered_lft = prefered_lft;
1793 ifp->tstamp = now;
1794 flags = ifp->flags;
1795 ifp->flags &= ~IFA_F_DEPRECATED;
1796 spin_unlock(&ifp->lock);
1797
1798 if (!(flags&IFA_F_TENTATIVE))
1799 ipv6_ifa_notify(0, ifp);
1800 } else
1801 spin_unlock(&ifp->lock);
1802
1803 #ifdef CONFIG_IPV6_PRIVACY
1804 read_lock_bh(&in6_dev->lock);
1805 /* update all temporary addresses in the list */
1806 for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1807 /*
1808 * When adjusting the lifetimes of an existing
1809 * temporary address, only lower the lifetimes.
1810 * Implementations must not increase the
1811 * lifetimes of an existing temporary address
1812 * when processing a Prefix Information Option.
1813 */
1814 spin_lock(&ift->lock);
1815 flags = ift->flags;
1816 if (ift->valid_lft > valid_lft &&
1817 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1818 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1819 if (ift->prefered_lft > prefered_lft &&
1820 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1821 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1822 spin_unlock(&ift->lock);
1823 if (!(flags&IFA_F_TENTATIVE))
1824 ipv6_ifa_notify(0, ift);
1825 }
1826
1827 if (create && in6_dev->cnf.use_tempaddr > 0) {
1828 /*
1829 * When a new public address is created as described in [ADDRCONF],
1830 * also create a new temporary address.
1831 */
1832 read_unlock_bh(&in6_dev->lock);
1833 ipv6_create_tempaddr(ifp, NULL);
1834 } else {
1835 read_unlock_bh(&in6_dev->lock);
1836 }
1837 #endif
1838 in6_ifa_put(ifp);
1839 addrconf_verify(0);
1840 }
1841 }
1842 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
1843 in6_dev_put(in6_dev);
1844 }
1845
1846 /*
1847 * Set destination address.
1848 * Special case for SIT interfaces where we create a new "virtual"
1849 * device.
1850 */
1851 int addrconf_set_dstaddr(void __user *arg)
1852 {
1853 struct in6_ifreq ireq;
1854 struct net_device *dev;
1855 int err = -EINVAL;
1856
1857 rtnl_lock();
1858
1859 err = -EFAULT;
1860 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1861 goto err_exit;
1862
1863 dev = __dev_get_by_index(ireq.ifr6_ifindex);
1864
1865 err = -ENODEV;
1866 if (dev == NULL)
1867 goto err_exit;
1868
1869 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1870 if (dev->type == ARPHRD_SIT) {
1871 struct ifreq ifr;
1872 mm_segment_t oldfs;
1873 struct ip_tunnel_parm p;
1874
1875 err = -EADDRNOTAVAIL;
1876 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
1877 goto err_exit;
1878
1879 memset(&p, 0, sizeof(p));
1880 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
1881 p.iph.saddr = 0;
1882 p.iph.version = 4;
1883 p.iph.ihl = 5;
1884 p.iph.protocol = IPPROTO_IPV6;
1885 p.iph.ttl = 64;
1886 ifr.ifr_ifru.ifru_data = (void __user *)&p;
1887
1888 oldfs = get_fs(); set_fs(KERNEL_DS);
1889 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
1890 set_fs(oldfs);
1891
1892 if (err == 0) {
1893 err = -ENOBUFS;
1894 if ((dev = __dev_get_by_name(p.name)) == NULL)
1895 goto err_exit;
1896 err = dev_open(dev);
1897 }
1898 }
1899 #endif
1900
1901 err_exit:
1902 rtnl_unlock();
1903 return err;
1904 }
1905
1906 /*
1907 * Manual configuration of address on an interface
1908 */
1909 static int inet6_addr_add(int ifindex, struct in6_addr *pfx, int plen,
1910 __u8 ifa_flags, __u32 prefered_lft, __u32 valid_lft)
1911 {
1912 struct inet6_ifaddr *ifp;
1913 struct inet6_dev *idev;
1914 struct net_device *dev;
1915 int scope;
1916
1917 ASSERT_RTNL();
1918
1919 /* check the lifetime */
1920 if (!valid_lft || prefered_lft > valid_lft)
1921 return -EINVAL;
1922
1923 if ((dev = __dev_get_by_index(ifindex)) == NULL)
1924 return -ENODEV;
1925
1926 if ((idev = addrconf_add_dev(dev)) == NULL)
1927 return -ENOBUFS;
1928
1929 scope = ipv6_addr_scope(pfx);
1930
1931 if (valid_lft == INFINITY_LIFE_TIME)
1932 ifa_flags |= IFA_F_PERMANENT;
1933 else if (valid_lft >= 0x7FFFFFFF/HZ)
1934 valid_lft = 0x7FFFFFFF/HZ;
1935
1936 if (prefered_lft == 0)
1937 ifa_flags |= IFA_F_DEPRECATED;
1938 else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
1939 (prefered_lft != INFINITY_LIFE_TIME))
1940 prefered_lft = 0x7FFFFFFF/HZ;
1941
1942 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
1943
1944 if (!IS_ERR(ifp)) {
1945 spin_lock_bh(&ifp->lock);
1946 ifp->valid_lft = valid_lft;
1947 ifp->prefered_lft = prefered_lft;
1948 ifp->tstamp = jiffies;
1949 spin_unlock_bh(&ifp->lock);
1950
1951 addrconf_dad_start(ifp, 0);
1952 in6_ifa_put(ifp);
1953 addrconf_verify(0);
1954 return 0;
1955 }
1956
1957 return PTR_ERR(ifp);
1958 }
1959
1960 static int inet6_addr_del(int ifindex, struct in6_addr *pfx, int plen)
1961 {
1962 struct inet6_ifaddr *ifp;
1963 struct inet6_dev *idev;
1964 struct net_device *dev;
1965
1966 if ((dev = __dev_get_by_index(ifindex)) == NULL)
1967 return -ENODEV;
1968
1969 if ((idev = __in6_dev_get(dev)) == NULL)
1970 return -ENXIO;
1971
1972 read_lock_bh(&idev->lock);
1973 for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
1974 if (ifp->prefix_len == plen &&
1975 ipv6_addr_equal(pfx, &ifp->addr)) {
1976 in6_ifa_hold(ifp);
1977 read_unlock_bh(&idev->lock);
1978
1979 ipv6_del_addr(ifp);
1980
1981 /* If the last address is deleted administratively,
1982 disable IPv6 on this interface.
1983 */
1984 if (idev->addr_list == NULL)
1985 addrconf_ifdown(idev->dev, 1);
1986 return 0;
1987 }
1988 }
1989 read_unlock_bh(&idev->lock);
1990 return -EADDRNOTAVAIL;
1991 }
1992
1993
1994 int addrconf_add_ifaddr(void __user *arg)
1995 {
1996 struct in6_ifreq ireq;
1997 int err;
1998
1999 if (!capable(CAP_NET_ADMIN))
2000 return -EPERM;
2001
2002 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2003 return -EFAULT;
2004
2005 rtnl_lock();
2006 err = inet6_addr_add(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen,
2007 IFA_F_PERMANENT, INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2008 rtnl_unlock();
2009 return err;
2010 }
2011
2012 int addrconf_del_ifaddr(void __user *arg)
2013 {
2014 struct in6_ifreq ireq;
2015 int err;
2016
2017 if (!capable(CAP_NET_ADMIN))
2018 return -EPERM;
2019
2020 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2021 return -EFAULT;
2022
2023 rtnl_lock();
2024 err = inet6_addr_del(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
2025 rtnl_unlock();
2026 return err;
2027 }
2028
2029 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2030 static void sit_add_v4_addrs(struct inet6_dev *idev)
2031 {
2032 struct inet6_ifaddr * ifp;
2033 struct in6_addr addr;
2034 struct net_device *dev;
2035 int scope;
2036
2037 ASSERT_RTNL();
2038
2039 memset(&addr, 0, sizeof(struct in6_addr));
2040 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2041
2042 if (idev->dev->flags&IFF_POINTOPOINT) {
2043 addr.s6_addr32[0] = htonl(0xfe800000);
2044 scope = IFA_LINK;
2045 } else {
2046 scope = IPV6_ADDR_COMPATv4;
2047 }
2048
2049 if (addr.s6_addr32[3]) {
2050 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
2051 if (!IS_ERR(ifp)) {
2052 spin_lock_bh(&ifp->lock);
2053 ifp->flags &= ~IFA_F_TENTATIVE;
2054 spin_unlock_bh(&ifp->lock);
2055 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2056 in6_ifa_put(ifp);
2057 }
2058 return;
2059 }
2060
2061 for (dev = dev_base; dev != NULL; dev = dev->next) {
2062 struct in_device * in_dev = __in_dev_get_rtnl(dev);
2063 if (in_dev && (dev->flags & IFF_UP)) {
2064 struct in_ifaddr * ifa;
2065
2066 int flag = scope;
2067
2068 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2069 int plen;
2070
2071 addr.s6_addr32[3] = ifa->ifa_local;
2072
2073 if (ifa->ifa_scope == RT_SCOPE_LINK)
2074 continue;
2075 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2076 if (idev->dev->flags&IFF_POINTOPOINT)
2077 continue;
2078 flag |= IFA_HOST;
2079 }
2080 if (idev->dev->flags&IFF_POINTOPOINT)
2081 plen = 64;
2082 else
2083 plen = 96;
2084
2085 ifp = ipv6_add_addr(idev, &addr, plen, flag,
2086 IFA_F_PERMANENT);
2087 if (!IS_ERR(ifp)) {
2088 spin_lock_bh(&ifp->lock);
2089 ifp->flags &= ~IFA_F_TENTATIVE;
2090 spin_unlock_bh(&ifp->lock);
2091 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2092 in6_ifa_put(ifp);
2093 }
2094 }
2095 }
2096 }
2097 }
2098 #endif
2099
2100 static void init_loopback(struct net_device *dev)
2101 {
2102 struct inet6_dev *idev;
2103 struct inet6_ifaddr * ifp;
2104
2105 /* ::1 */
2106
2107 ASSERT_RTNL();
2108
2109 if ((idev = ipv6_find_idev(dev)) == NULL) {
2110 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2111 return;
2112 }
2113
2114 ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
2115 if (!IS_ERR(ifp)) {
2116 spin_lock_bh(&ifp->lock);
2117 ifp->flags &= ~IFA_F_TENTATIVE;
2118 spin_unlock_bh(&ifp->lock);
2119 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2120 in6_ifa_put(ifp);
2121 }
2122 }
2123
2124 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2125 {
2126 struct inet6_ifaddr * ifp;
2127
2128 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, IFA_F_PERMANENT);
2129 if (!IS_ERR(ifp)) {
2130 addrconf_dad_start(ifp, 0);
2131 in6_ifa_put(ifp);
2132 }
2133 }
2134
2135 static void addrconf_dev_config(struct net_device *dev)
2136 {
2137 struct in6_addr addr;
2138 struct inet6_dev * idev;
2139
2140 ASSERT_RTNL();
2141
2142 if ((dev->type != ARPHRD_ETHER) &&
2143 (dev->type != ARPHRD_FDDI) &&
2144 (dev->type != ARPHRD_IEEE802_TR) &&
2145 (dev->type != ARPHRD_ARCNET) &&
2146 (dev->type != ARPHRD_INFINIBAND)) {
2147 /* Alas, we support only Ethernet autoconfiguration. */
2148 return;
2149 }
2150
2151 idev = addrconf_add_dev(dev);
2152 if (idev == NULL)
2153 return;
2154
2155 memset(&addr, 0, sizeof(struct in6_addr));
2156 addr.s6_addr32[0] = htonl(0xFE800000);
2157
2158 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2159 addrconf_add_linklocal(idev, &addr);
2160 }
2161
2162 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2163 static void addrconf_sit_config(struct net_device *dev)
2164 {
2165 struct inet6_dev *idev;
2166
2167 ASSERT_RTNL();
2168
2169 /*
2170 * Configure the tunnel with one of our IPv4
2171 * addresses... we should configure all of
2172 * our v4 addrs in the tunnel
2173 */
2174
2175 if ((idev = ipv6_find_idev(dev)) == NULL) {
2176 printk(KERN_DEBUG "init sit: add_dev failed\n");
2177 return;
2178 }
2179
2180 sit_add_v4_addrs(idev);
2181
2182 if (dev->flags&IFF_POINTOPOINT) {
2183 addrconf_add_mroute(dev);
2184 addrconf_add_lroute(dev);
2185 } else
2186 sit_route_add(dev);
2187 }
2188 #endif
2189
2190 static inline int
2191 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2192 {
2193 struct in6_addr lladdr;
2194
2195 if (!ipv6_get_lladdr(link_dev, &lladdr)) {
2196 addrconf_add_linklocal(idev, &lladdr);
2197 return 0;
2198 }
2199 return -1;
2200 }
2201
2202 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2203 {
2204 struct net_device *link_dev;
2205
2206 /* first try to inherit the link-local address from the link device */
2207 if (idev->dev->iflink &&
2208 (link_dev = __dev_get_by_index(idev->dev->iflink))) {
2209 if (!ipv6_inherit_linklocal(idev, link_dev))
2210 return;
2211 }
2212 /* then try to inherit it from any device */
2213 for (link_dev = dev_base; link_dev; link_dev = link_dev->next) {
2214 if (!ipv6_inherit_linklocal(idev, link_dev))
2215 return;
2216 }
2217 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2218 }
2219
2220 /*
2221 * Autoconfigure tunnel with a link-local address so routing protocols,
2222 * DHCPv6, MLD etc. can be run over the virtual link
2223 */
2224
2225 static void addrconf_ip6_tnl_config(struct net_device *dev)
2226 {
2227 struct inet6_dev *idev;
2228
2229 ASSERT_RTNL();
2230
2231 if ((idev = addrconf_add_dev(dev)) == NULL) {
2232 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2233 return;
2234 }
2235 ip6_tnl_add_linklocal(idev);
2236 }
2237
2238 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2239 void * data)
2240 {
2241 struct net_device *dev = (struct net_device *) data;
2242 struct inet6_dev *idev = __in6_dev_get(dev);
2243 int run_pending = 0;
2244
2245 switch(event) {
2246 case NETDEV_UP:
2247 case NETDEV_CHANGE:
2248 if (event == NETDEV_UP) {
2249 if (!netif_carrier_ok(dev)) {
2250 /* device is not ready yet. */
2251 printk(KERN_INFO
2252 "ADDRCONF(NETDEV_UP): %s: "
2253 "link is not ready\n",
2254 dev->name);
2255 break;
2256 }
2257
2258 if (idev)
2259 idev->if_flags |= IF_READY;
2260 } else {
2261 if (!netif_carrier_ok(dev)) {
2262 /* device is still not ready. */
2263 break;
2264 }
2265
2266 if (idev) {
2267 if (idev->if_flags & IF_READY) {
2268 /* device is already configured. */
2269 break;
2270 }
2271 idev->if_flags |= IF_READY;
2272 }
2273
2274 printk(KERN_INFO
2275 "ADDRCONF(NETDEV_CHANGE): %s: "
2276 "link becomes ready\n",
2277 dev->name);
2278
2279 run_pending = 1;
2280 }
2281
2282 switch(dev->type) {
2283 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2284 case ARPHRD_SIT:
2285 addrconf_sit_config(dev);
2286 break;
2287 #endif
2288 case ARPHRD_TUNNEL6:
2289 addrconf_ip6_tnl_config(dev);
2290 break;
2291 case ARPHRD_LOOPBACK:
2292 init_loopback(dev);
2293 break;
2294
2295 default:
2296 addrconf_dev_config(dev);
2297 break;
2298 };
2299 if (idev) {
2300 if (run_pending)
2301 addrconf_dad_run(idev);
2302
2303 /* If the MTU changed during the interface down, when the
2304 interface up, the changed MTU must be reflected in the
2305 idev as well as routers.
2306 */
2307 if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2308 rt6_mtu_change(dev, dev->mtu);
2309 idev->cnf.mtu6 = dev->mtu;
2310 }
2311 idev->tstamp = jiffies;
2312 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2313 /* If the changed mtu during down is lower than IPV6_MIN_MTU
2314 stop IPv6 on this interface.
2315 */
2316 if (dev->mtu < IPV6_MIN_MTU)
2317 addrconf_ifdown(dev, event != NETDEV_DOWN);
2318 }
2319 break;
2320
2321 case NETDEV_CHANGEMTU:
2322 if ( idev && dev->mtu >= IPV6_MIN_MTU) {
2323 rt6_mtu_change(dev, dev->mtu);
2324 idev->cnf.mtu6 = dev->mtu;
2325 break;
2326 }
2327
2328 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2329
2330 case NETDEV_DOWN:
2331 case NETDEV_UNREGISTER:
2332 /*
2333 * Remove all addresses from this interface.
2334 */
2335 addrconf_ifdown(dev, event != NETDEV_DOWN);
2336 break;
2337
2338 case NETDEV_CHANGENAME:
2339 #ifdef CONFIG_SYSCTL
2340 if (idev) {
2341 addrconf_sysctl_unregister(&idev->cnf);
2342 neigh_sysctl_unregister(idev->nd_parms);
2343 neigh_sysctl_register(dev, idev->nd_parms,
2344 NET_IPV6, NET_IPV6_NEIGH, "ipv6",
2345 &ndisc_ifinfo_sysctl_change,
2346 NULL);
2347 addrconf_sysctl_register(idev, &idev->cnf);
2348 }
2349 #endif
2350 break;
2351 };
2352
2353 return NOTIFY_OK;
2354 }
2355
2356 /*
2357 * addrconf module should be notified of a device going up
2358 */
2359 static struct notifier_block ipv6_dev_notf = {
2360 .notifier_call = addrconf_notify,
2361 .priority = 0
2362 };
2363
2364 static int addrconf_ifdown(struct net_device *dev, int how)
2365 {
2366 struct inet6_dev *idev;
2367 struct inet6_ifaddr *ifa, **bifa;
2368 int i;
2369
2370 ASSERT_RTNL();
2371
2372 if (dev == &loopback_dev && how == 1)
2373 how = 0;
2374
2375 rt6_ifdown(dev);
2376 neigh_ifdown(&nd_tbl, dev);
2377
2378 idev = __in6_dev_get(dev);
2379 if (idev == NULL)
2380 return -ENODEV;
2381
2382 /* Step 1: remove reference to ipv6 device from parent device.
2383 Do not dev_put!
2384 */
2385 if (how == 1) {
2386 idev->dead = 1;
2387
2388 /* protected by rtnl_lock */
2389 rcu_assign_pointer(dev->ip6_ptr, NULL);
2390
2391 /* Step 1.5: remove snmp6 entry */
2392 snmp6_unregister_dev(idev);
2393
2394 }
2395
2396 /* Step 2: clear hash table */
2397 for (i=0; i<IN6_ADDR_HSIZE; i++) {
2398 bifa = &inet6_addr_lst[i];
2399
2400 write_lock_bh(&addrconf_hash_lock);
2401 while ((ifa = *bifa) != NULL) {
2402 if (ifa->idev == idev) {
2403 *bifa = ifa->lst_next;
2404 ifa->lst_next = NULL;
2405 addrconf_del_timer(ifa);
2406 in6_ifa_put(ifa);
2407 continue;
2408 }
2409 bifa = &ifa->lst_next;
2410 }
2411 write_unlock_bh(&addrconf_hash_lock);
2412 }
2413
2414 write_lock_bh(&idev->lock);
2415
2416 /* Step 3: clear flags for stateless addrconf */
2417 if (how != 1)
2418 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2419
2420 /* Step 4: clear address list */
2421 #ifdef CONFIG_IPV6_PRIVACY
2422 if (how == 1 && del_timer(&idev->regen_timer))
2423 in6_dev_put(idev);
2424
2425 /* clear tempaddr list */
2426 while ((ifa = idev->tempaddr_list) != NULL) {
2427 idev->tempaddr_list = ifa->tmp_next;
2428 ifa->tmp_next = NULL;
2429 ifa->dead = 1;
2430 write_unlock_bh(&idev->lock);
2431 spin_lock_bh(&ifa->lock);
2432
2433 if (ifa->ifpub) {
2434 in6_ifa_put(ifa->ifpub);
2435 ifa->ifpub = NULL;
2436 }
2437 spin_unlock_bh(&ifa->lock);
2438 in6_ifa_put(ifa);
2439 write_lock_bh(&idev->lock);
2440 }
2441 #endif
2442 while ((ifa = idev->addr_list) != NULL) {
2443 idev->addr_list = ifa->if_next;
2444 ifa->if_next = NULL;
2445 ifa->dead = 1;
2446 addrconf_del_timer(ifa);
2447 write_unlock_bh(&idev->lock);
2448
2449 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2450 in6_ifa_put(ifa);
2451
2452 write_lock_bh(&idev->lock);
2453 }
2454 write_unlock_bh(&idev->lock);
2455
2456 /* Step 5: Discard multicast list */
2457
2458 if (how == 1)
2459 ipv6_mc_destroy_dev(idev);
2460 else
2461 ipv6_mc_down(idev);
2462
2463 /* Step 5: netlink notification of this interface */
2464 idev->tstamp = jiffies;
2465 inet6_ifinfo_notify(RTM_DELLINK, idev);
2466
2467 /* Shot the device (if unregistered) */
2468
2469 if (how == 1) {
2470 #ifdef CONFIG_SYSCTL
2471 addrconf_sysctl_unregister(&idev->cnf);
2472 neigh_sysctl_unregister(idev->nd_parms);
2473 #endif
2474 neigh_parms_release(&nd_tbl, idev->nd_parms);
2475 neigh_ifdown(&nd_tbl, dev);
2476 in6_dev_put(idev);
2477 }
2478 return 0;
2479 }
2480
2481 static void addrconf_rs_timer(unsigned long data)
2482 {
2483 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2484
2485 if (ifp->idev->cnf.forwarding)
2486 goto out;
2487
2488 if (ifp->idev->if_flags & IF_RA_RCVD) {
2489 /*
2490 * Announcement received after solicitation
2491 * was sent
2492 */
2493 goto out;
2494 }
2495
2496 spin_lock(&ifp->lock);
2497 if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2498 struct in6_addr all_routers;
2499
2500 /* The wait after the last probe can be shorter */
2501 addrconf_mod_timer(ifp, AC_RS,
2502 (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2503 ifp->idev->cnf.rtr_solicit_delay :
2504 ifp->idev->cnf.rtr_solicit_interval);
2505 spin_unlock(&ifp->lock);
2506
2507 ipv6_addr_all_routers(&all_routers);
2508
2509 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2510 } else {
2511 spin_unlock(&ifp->lock);
2512 /*
2513 * Note: we do not support deprecated "all on-link"
2514 * assumption any longer.
2515 */
2516 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2517 ifp->idev->dev->name);
2518 }
2519
2520 out:
2521 in6_ifa_put(ifp);
2522 }
2523
2524 /*
2525 * Duplicate Address Detection
2526 */
2527 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2528 {
2529 unsigned long rand_num;
2530 struct inet6_dev *idev = ifp->idev;
2531
2532 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2533 ifp->probes = idev->cnf.dad_transmits;
2534 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2535 }
2536
2537 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2538 {
2539 struct inet6_dev *idev = ifp->idev;
2540 struct net_device *dev = idev->dev;
2541
2542 addrconf_join_solict(dev, &ifp->addr);
2543
2544 if (ifp->prefix_len != 128 && (ifp->flags&IFA_F_PERMANENT))
2545 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 0,
2546 flags);
2547
2548 net_srandom(ifp->addr.s6_addr32[3]);
2549
2550 read_lock_bh(&idev->lock);
2551 if (ifp->dead)
2552 goto out;
2553 spin_lock_bh(&ifp->lock);
2554
2555 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2556 !(ifp->flags&IFA_F_TENTATIVE) ||
2557 ifp->flags & IFA_F_NODAD) {
2558 ifp->flags &= ~IFA_F_TENTATIVE;
2559 spin_unlock_bh(&ifp->lock);
2560 read_unlock_bh(&idev->lock);
2561
2562 addrconf_dad_completed(ifp);
2563 return;
2564 }
2565
2566 if (!(idev->if_flags & IF_READY)) {
2567 spin_unlock_bh(&ifp->lock);
2568 read_unlock_bh(&idev->lock);
2569 /*
2570 * If the defice is not ready:
2571 * - keep it tentative if it is a permanent address.
2572 * - otherwise, kill it.
2573 */
2574 in6_ifa_hold(ifp);
2575 addrconf_dad_stop(ifp);
2576 return;
2577 }
2578 addrconf_dad_kick(ifp);
2579 spin_unlock_bh(&ifp->lock);
2580 out:
2581 read_unlock_bh(&idev->lock);
2582 }
2583
2584 static void addrconf_dad_timer(unsigned long data)
2585 {
2586 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2587 struct inet6_dev *idev = ifp->idev;
2588 struct in6_addr unspec;
2589 struct in6_addr mcaddr;
2590
2591 read_lock_bh(&idev->lock);
2592 if (idev->dead) {
2593 read_unlock_bh(&idev->lock);
2594 goto out;
2595 }
2596 spin_lock_bh(&ifp->lock);
2597 if (ifp->probes == 0) {
2598 /*
2599 * DAD was successful
2600 */
2601
2602 ifp->flags &= ~IFA_F_TENTATIVE;
2603 spin_unlock_bh(&ifp->lock);
2604 read_unlock_bh(&idev->lock);
2605
2606 addrconf_dad_completed(ifp);
2607
2608 goto out;
2609 }
2610
2611 ifp->probes--;
2612 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2613 spin_unlock_bh(&ifp->lock);
2614 read_unlock_bh(&idev->lock);
2615
2616 /* send a neighbour solicitation for our addr */
2617 memset(&unspec, 0, sizeof(unspec));
2618 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2619 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec);
2620 out:
2621 in6_ifa_put(ifp);
2622 }
2623
2624 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2625 {
2626 struct net_device * dev = ifp->idev->dev;
2627
2628 /*
2629 * Configure the address for reception. Now it is valid.
2630 */
2631
2632 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2633
2634 /* If added prefix is link local and forwarding is off,
2635 start sending router solicitations.
2636 */
2637
2638 if (ifp->idev->cnf.forwarding == 0 &&
2639 ifp->idev->cnf.rtr_solicits > 0 &&
2640 (dev->flags&IFF_LOOPBACK) == 0 &&
2641 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2642 struct in6_addr all_routers;
2643
2644 ipv6_addr_all_routers(&all_routers);
2645
2646 /*
2647 * If a host as already performed a random delay
2648 * [...] as part of DAD [...] there is no need
2649 * to delay again before sending the first RS
2650 */
2651 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2652
2653 spin_lock_bh(&ifp->lock);
2654 ifp->probes = 1;
2655 ifp->idev->if_flags |= IF_RS_SENT;
2656 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2657 spin_unlock_bh(&ifp->lock);
2658 }
2659 }
2660
2661 static void addrconf_dad_run(struct inet6_dev *idev) {
2662 struct inet6_ifaddr *ifp;
2663
2664 read_lock_bh(&idev->lock);
2665 for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2666 spin_lock_bh(&ifp->lock);
2667 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2668 spin_unlock_bh(&ifp->lock);
2669 continue;
2670 }
2671 spin_unlock_bh(&ifp->lock);
2672 addrconf_dad_kick(ifp);
2673 }
2674 read_unlock_bh(&idev->lock);
2675 }
2676
2677 #ifdef CONFIG_PROC_FS
2678 struct if6_iter_state {
2679 int bucket;
2680 };
2681
2682 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2683 {
2684 struct inet6_ifaddr *ifa = NULL;
2685 struct if6_iter_state *state = seq->private;
2686
2687 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2688 ifa = inet6_addr_lst[state->bucket];
2689 if (ifa)
2690 break;
2691 }
2692 return ifa;
2693 }
2694
2695 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2696 {
2697 struct if6_iter_state *state = seq->private;
2698
2699 ifa = ifa->lst_next;
2700 try_again:
2701 if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2702 ifa = inet6_addr_lst[state->bucket];
2703 goto try_again;
2704 }
2705 return ifa;
2706 }
2707
2708 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2709 {
2710 struct inet6_ifaddr *ifa = if6_get_first(seq);
2711
2712 if (ifa)
2713 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2714 --pos;
2715 return pos ? NULL : ifa;
2716 }
2717
2718 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2719 {
2720 read_lock_bh(&addrconf_hash_lock);
2721 return if6_get_idx(seq, *pos);
2722 }
2723
2724 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2725 {
2726 struct inet6_ifaddr *ifa;
2727
2728 ifa = if6_get_next(seq, v);
2729 ++*pos;
2730 return ifa;
2731 }
2732
2733 static void if6_seq_stop(struct seq_file *seq, void *v)
2734 {
2735 read_unlock_bh(&addrconf_hash_lock);
2736 }
2737
2738 static int if6_seq_show(struct seq_file *seq, void *v)
2739 {
2740 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2741 seq_printf(seq,
2742 NIP6_SEQFMT " %02x %02x %02x %02x %8s\n",
2743 NIP6(ifp->addr),
2744 ifp->idev->dev->ifindex,
2745 ifp->prefix_len,
2746 ifp->scope,
2747 ifp->flags,
2748 ifp->idev->dev->name);
2749 return 0;
2750 }
2751
2752 static struct seq_operations if6_seq_ops = {
2753 .start = if6_seq_start,
2754 .next = if6_seq_next,
2755 .show = if6_seq_show,
2756 .stop = if6_seq_stop,
2757 };
2758
2759 static int if6_seq_open(struct inode *inode, struct file *file)
2760 {
2761 struct seq_file *seq;
2762 int rc = -ENOMEM;
2763 struct if6_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL);
2764
2765 if (!s)
2766 goto out;
2767
2768 rc = seq_open(file, &if6_seq_ops);
2769 if (rc)
2770 goto out_kfree;
2771
2772 seq = file->private_data;
2773 seq->private = s;
2774 out:
2775 return rc;
2776 out_kfree:
2777 kfree(s);
2778 goto out;
2779 }
2780
2781 static struct file_operations if6_fops = {
2782 .owner = THIS_MODULE,
2783 .open = if6_seq_open,
2784 .read = seq_read,
2785 .llseek = seq_lseek,
2786 .release = seq_release_private,
2787 };
2788
2789 int __init if6_proc_init(void)
2790 {
2791 if (!proc_net_fops_create("if_inet6", S_IRUGO, &if6_fops))
2792 return -ENOMEM;
2793 return 0;
2794 }
2795
2796 void if6_proc_exit(void)
2797 {
2798 proc_net_remove("if_inet6");
2799 }
2800 #endif /* CONFIG_PROC_FS */
2801
2802 #ifdef CONFIG_IPV6_MIP6
2803 /* Check if address is a home address configured on any interface. */
2804 int ipv6_chk_home_addr(struct in6_addr *addr)
2805 {
2806 int ret = 0;
2807 struct inet6_ifaddr * ifp;
2808 u8 hash = ipv6_addr_hash(addr);
2809 read_lock_bh(&addrconf_hash_lock);
2810 for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) {
2811 if (ipv6_addr_cmp(&ifp->addr, addr) == 0 &&
2812 (ifp->flags & IFA_F_HOMEADDRESS)) {
2813 ret = 1;
2814 break;
2815 }
2816 }
2817 read_unlock_bh(&addrconf_hash_lock);
2818 return ret;
2819 }
2820 #endif
2821
2822 /*
2823 * Periodic address status verification
2824 */
2825
2826 static void addrconf_verify(unsigned long foo)
2827 {
2828 struct inet6_ifaddr *ifp;
2829 unsigned long now, next;
2830 int i;
2831
2832 spin_lock_bh(&addrconf_verify_lock);
2833 now = jiffies;
2834 next = now + ADDR_CHECK_FREQUENCY;
2835
2836 del_timer(&addr_chk_timer);
2837
2838 for (i=0; i < IN6_ADDR_HSIZE; i++) {
2839
2840 restart:
2841 read_lock(&addrconf_hash_lock);
2842 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
2843 unsigned long age;
2844 #ifdef CONFIG_IPV6_PRIVACY
2845 unsigned long regen_advance;
2846 #endif
2847
2848 if (ifp->flags & IFA_F_PERMANENT)
2849 continue;
2850
2851 spin_lock(&ifp->lock);
2852 age = (now - ifp->tstamp) / HZ;
2853
2854 #ifdef CONFIG_IPV6_PRIVACY
2855 regen_advance = ifp->idev->cnf.regen_max_retry *
2856 ifp->idev->cnf.dad_transmits *
2857 ifp->idev->nd_parms->retrans_time / HZ;
2858 #endif
2859
2860 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
2861 age >= ifp->valid_lft) {
2862 spin_unlock(&ifp->lock);
2863 in6_ifa_hold(ifp);
2864 read_unlock(&addrconf_hash_lock);
2865 ipv6_del_addr(ifp);
2866 goto restart;
2867 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
2868 spin_unlock(&ifp->lock);
2869 continue;
2870 } else if (age >= ifp->prefered_lft) {
2871 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
2872 int deprecate = 0;
2873
2874 if (!(ifp->flags&IFA_F_DEPRECATED)) {
2875 deprecate = 1;
2876 ifp->flags |= IFA_F_DEPRECATED;
2877 }
2878
2879 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
2880 next = ifp->tstamp + ifp->valid_lft * HZ;
2881
2882 spin_unlock(&ifp->lock);
2883
2884 if (deprecate) {
2885 in6_ifa_hold(ifp);
2886 read_unlock(&addrconf_hash_lock);
2887
2888 ipv6_ifa_notify(0, ifp);
2889 in6_ifa_put(ifp);
2890 goto restart;
2891 }
2892 #ifdef CONFIG_IPV6_PRIVACY
2893 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
2894 !(ifp->flags&IFA_F_TENTATIVE)) {
2895 if (age >= ifp->prefered_lft - regen_advance) {
2896 struct inet6_ifaddr *ifpub = ifp->ifpub;
2897 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2898 next = ifp->tstamp + ifp->prefered_lft * HZ;
2899 if (!ifp->regen_count && ifpub) {
2900 ifp->regen_count++;
2901 in6_ifa_hold(ifp);
2902 in6_ifa_hold(ifpub);
2903 spin_unlock(&ifp->lock);
2904 read_unlock(&addrconf_hash_lock);
2905 spin_lock(&ifpub->lock);
2906 ifpub->regen_count = 0;
2907 spin_unlock(&ifpub->lock);
2908 ipv6_create_tempaddr(ifpub, ifp);
2909 in6_ifa_put(ifpub);
2910 in6_ifa_put(ifp);
2911 goto restart;
2912 }
2913 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
2914 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
2915 spin_unlock(&ifp->lock);
2916 #endif
2917 } else {
2918 /* ifp->prefered_lft <= ifp->valid_lft */
2919 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2920 next = ifp->tstamp + ifp->prefered_lft * HZ;
2921 spin_unlock(&ifp->lock);
2922 }
2923 }
2924 read_unlock(&addrconf_hash_lock);
2925 }
2926
2927 addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
2928 add_timer(&addr_chk_timer);
2929 spin_unlock_bh(&addrconf_verify_lock);
2930 }
2931
2932 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
2933 {
2934 struct in6_addr *pfx = NULL;
2935
2936 if (addr)
2937 pfx = nla_data(addr);
2938
2939 if (local) {
2940 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
2941 pfx = NULL;
2942 else
2943 pfx = nla_data(local);
2944 }
2945
2946 return pfx;
2947 }
2948
2949 static struct nla_policy ifa_ipv6_policy[IFA_MAX+1] __read_mostly = {
2950 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
2951 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
2952 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
2953 };
2954
2955 static int
2956 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
2957 {
2958 struct ifaddrmsg *ifm;
2959 struct nlattr *tb[IFA_MAX+1];
2960 struct in6_addr *pfx;
2961 int err;
2962
2963 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
2964 if (err < 0)
2965 return err;
2966
2967 ifm = nlmsg_data(nlh);
2968 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
2969 if (pfx == NULL)
2970 return -EINVAL;
2971
2972 return inet6_addr_del(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
2973 }
2974
2975 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
2976 u32 prefered_lft, u32 valid_lft)
2977 {
2978 if (!valid_lft || (prefered_lft > valid_lft))
2979 return -EINVAL;
2980
2981 if (valid_lft == INFINITY_LIFE_TIME)
2982 ifa_flags |= IFA_F_PERMANENT;
2983 else if (valid_lft >= 0x7FFFFFFF/HZ)
2984 valid_lft = 0x7FFFFFFF/HZ;
2985
2986 if (prefered_lft == 0)
2987 ifa_flags |= IFA_F_DEPRECATED;
2988 else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
2989 (prefered_lft != INFINITY_LIFE_TIME))
2990 prefered_lft = 0x7FFFFFFF/HZ;
2991
2992 spin_lock_bh(&ifp->lock);
2993 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
2994 ifp->tstamp = jiffies;
2995 ifp->valid_lft = valid_lft;
2996 ifp->prefered_lft = prefered_lft;
2997
2998 spin_unlock_bh(&ifp->lock);
2999 if (!(ifp->flags&IFA_F_TENTATIVE))
3000 ipv6_ifa_notify(0, ifp);
3001
3002 addrconf_verify(0);
3003
3004 return 0;
3005 }
3006
3007 static int
3008 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3009 {
3010 struct ifaddrmsg *ifm;
3011 struct nlattr *tb[IFA_MAX+1];
3012 struct in6_addr *pfx;
3013 struct inet6_ifaddr *ifa;
3014 struct net_device *dev;
3015 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3016 u8 ifa_flags;
3017 int err;
3018
3019 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3020 if (err < 0)
3021 return err;
3022
3023 ifm = nlmsg_data(nlh);
3024 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3025 if (pfx == NULL)
3026 return -EINVAL;
3027
3028 if (tb[IFA_CACHEINFO]) {
3029 struct ifa_cacheinfo *ci;
3030
3031 ci = nla_data(tb[IFA_CACHEINFO]);
3032 valid_lft = ci->ifa_valid;
3033 preferred_lft = ci->ifa_prefered;
3034 } else {
3035 preferred_lft = INFINITY_LIFE_TIME;
3036 valid_lft = INFINITY_LIFE_TIME;
3037 }
3038
3039 dev = __dev_get_by_index(ifm->ifa_index);
3040 if (dev == NULL)
3041 return -ENODEV;
3042
3043 /* We ignore other flags so far. */
3044 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3045
3046 ifa = ipv6_get_ifaddr(pfx, dev, 1);
3047 if (ifa == NULL) {
3048 /*
3049 * It would be best to check for !NLM_F_CREATE here but
3050 * userspace alreay relies on not having to provide this.
3051 */
3052 return inet6_addr_add(ifm->ifa_index, pfx, ifm->ifa_prefixlen,
3053 ifa_flags, preferred_lft, valid_lft);
3054 }
3055
3056 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3057 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3058 err = -EEXIST;
3059 else
3060 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3061
3062 in6_ifa_put(ifa);
3063
3064 return err;
3065 }
3066
3067 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3068 u8 scope, int ifindex)
3069 {
3070 struct ifaddrmsg *ifm;
3071
3072 ifm = nlmsg_data(nlh);
3073 ifm->ifa_family = AF_INET6;
3074 ifm->ifa_prefixlen = prefixlen;
3075 ifm->ifa_flags = flags;
3076 ifm->ifa_scope = scope;
3077 ifm->ifa_index = ifindex;
3078 }
3079
3080 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3081 unsigned long tstamp, u32 preferred, u32 valid)
3082 {
3083 struct ifa_cacheinfo ci;
3084
3085 ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3086 + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3087 ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3088 + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3089 ci.ifa_prefered = preferred;
3090 ci.ifa_valid = valid;
3091
3092 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3093 }
3094
3095 static inline int rt_scope(int ifa_scope)
3096 {
3097 if (ifa_scope & IFA_HOST)
3098 return RT_SCOPE_HOST;
3099 else if (ifa_scope & IFA_LINK)
3100 return RT_SCOPE_LINK;
3101 else if (ifa_scope & IFA_SITE)
3102 return RT_SCOPE_SITE;
3103 else
3104 return RT_SCOPE_UNIVERSE;
3105 }
3106
3107 static inline int inet6_ifaddr_msgsize(void)
3108 {
3109 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3110 + nla_total_size(16) /* IFA_ADDRESS */
3111 + nla_total_size(sizeof(struct ifa_cacheinfo));
3112 }
3113
3114 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3115 u32 pid, u32 seq, int event, unsigned int flags)
3116 {
3117 struct nlmsghdr *nlh;
3118 u32 preferred, valid;
3119
3120 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3121 if (nlh == NULL)
3122 return -ENOBUFS;
3123
3124 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3125 ifa->idev->dev->ifindex);
3126
3127 if (!(ifa->flags&IFA_F_PERMANENT)) {
3128 preferred = ifa->prefered_lft;
3129 valid = ifa->valid_lft;
3130 if (preferred != INFINITY_LIFE_TIME) {
3131 long tval = (jiffies - ifa->tstamp)/HZ;
3132 preferred -= tval;
3133 if (valid != INFINITY_LIFE_TIME)
3134 valid -= tval;
3135 }
3136 } else {
3137 preferred = INFINITY_LIFE_TIME;
3138 valid = INFINITY_LIFE_TIME;
3139 }
3140
3141 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3142 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
3143 return nlmsg_cancel(skb, nlh);
3144
3145 return nlmsg_end(skb, nlh);
3146 }
3147
3148 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3149 u32 pid, u32 seq, int event, u16 flags)
3150 {
3151 struct nlmsghdr *nlh;
3152 u8 scope = RT_SCOPE_UNIVERSE;
3153 int ifindex = ifmca->idev->dev->ifindex;
3154
3155 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3156 scope = RT_SCOPE_SITE;
3157
3158 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3159 if (nlh == NULL)
3160 return -ENOBUFS;
3161
3162 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3163 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3164 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3165 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0)
3166 return nlmsg_cancel(skb, nlh);
3167
3168 return nlmsg_end(skb, nlh);
3169 }
3170
3171 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3172 u32 pid, u32 seq, int event, unsigned int flags)
3173 {
3174 struct nlmsghdr *nlh;
3175 u8 scope = RT_SCOPE_UNIVERSE;
3176 int ifindex = ifaca->aca_idev->dev->ifindex;
3177
3178 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3179 scope = RT_SCOPE_SITE;
3180
3181 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3182 if (nlh == NULL)
3183 return -ENOBUFS;
3184
3185 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3186 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3187 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3188 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0)
3189 return nlmsg_cancel(skb, nlh);
3190
3191 return nlmsg_end(skb, nlh);
3192 }
3193
3194 enum addr_type_t
3195 {
3196 UNICAST_ADDR,
3197 MULTICAST_ADDR,
3198 ANYCAST_ADDR,
3199 };
3200
3201 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3202 enum addr_type_t type)
3203 {
3204 int idx, ip_idx;
3205 int s_idx, s_ip_idx;
3206 int err = 1;
3207 struct net_device *dev;
3208 struct inet6_dev *idev = NULL;
3209 struct inet6_ifaddr *ifa;
3210 struct ifmcaddr6 *ifmca;
3211 struct ifacaddr6 *ifaca;
3212
3213 s_idx = cb->args[0];
3214 s_ip_idx = ip_idx = cb->args[1];
3215 read_lock(&dev_base_lock);
3216
3217 for (dev = dev_base, idx = 0; dev; dev = dev->next, idx++) {
3218 if (idx < s_idx)
3219 continue;
3220 if (idx > s_idx)
3221 s_ip_idx = 0;
3222 ip_idx = 0;
3223 if ((idev = in6_dev_get(dev)) == NULL)
3224 continue;
3225 read_lock_bh(&idev->lock);
3226 switch (type) {
3227 case UNICAST_ADDR:
3228 /* unicast address incl. temp addr */
3229 for (ifa = idev->addr_list; ifa;
3230 ifa = ifa->if_next, ip_idx++) {
3231 if (ip_idx < s_ip_idx)
3232 continue;
3233 if ((err = inet6_fill_ifaddr(skb, ifa,
3234 NETLINK_CB(cb->skb).pid,
3235 cb->nlh->nlmsg_seq, RTM_NEWADDR,
3236 NLM_F_MULTI)) <= 0)
3237 goto done;
3238 }
3239 break;
3240 case MULTICAST_ADDR:
3241 /* multicast address */
3242 for (ifmca = idev->mc_list; ifmca;
3243 ifmca = ifmca->next, ip_idx++) {
3244 if (ip_idx < s_ip_idx)
3245 continue;
3246 if ((err = inet6_fill_ifmcaddr(skb, ifmca,
3247 NETLINK_CB(cb->skb).pid,
3248 cb->nlh->nlmsg_seq, RTM_GETMULTICAST,
3249 NLM_F_MULTI)) <= 0)
3250 goto done;
3251 }
3252 break;
3253 case ANYCAST_ADDR:
3254 /* anycast address */
3255 for (ifaca = idev->ac_list; ifaca;
3256 ifaca = ifaca->aca_next, ip_idx++) {
3257 if (ip_idx < s_ip_idx)
3258 continue;
3259 if ((err = inet6_fill_ifacaddr(skb, ifaca,
3260 NETLINK_CB(cb->skb).pid,
3261 cb->nlh->nlmsg_seq, RTM_GETANYCAST,
3262 NLM_F_MULTI)) <= 0)
3263 goto done;
3264 }
3265 break;
3266 default:
3267 break;
3268 }
3269 read_unlock_bh(&idev->lock);
3270 in6_dev_put(idev);
3271 }
3272 done:
3273 if (err <= 0) {
3274 read_unlock_bh(&idev->lock);
3275 in6_dev_put(idev);
3276 }
3277 read_unlock(&dev_base_lock);
3278 cb->args[0] = idx;
3279 cb->args[1] = ip_idx;
3280 return skb->len;
3281 }
3282
3283 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3284 {
3285 enum addr_type_t type = UNICAST_ADDR;
3286 return inet6_dump_addr(skb, cb, type);
3287 }
3288
3289 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3290 {
3291 enum addr_type_t type = MULTICAST_ADDR;
3292 return inet6_dump_addr(skb, cb, type);
3293 }
3294
3295
3296 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3297 {
3298 enum addr_type_t type = ANYCAST_ADDR;
3299 return inet6_dump_addr(skb, cb, type);
3300 }
3301
3302 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3303 void *arg)
3304 {
3305 struct ifaddrmsg *ifm;
3306 struct nlattr *tb[IFA_MAX+1];
3307 struct in6_addr *addr = NULL;
3308 struct net_device *dev = NULL;
3309 struct inet6_ifaddr *ifa;
3310 struct sk_buff *skb;
3311 int err;
3312
3313 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3314 if (err < 0)
3315 goto errout;
3316
3317 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3318 if (addr == NULL) {
3319 err = -EINVAL;
3320 goto errout;
3321 }
3322
3323 ifm = nlmsg_data(nlh);
3324 if (ifm->ifa_index)
3325 dev = __dev_get_by_index(ifm->ifa_index);
3326
3327 if ((ifa = ipv6_get_ifaddr(addr, dev, 1)) == NULL) {
3328 err = -EADDRNOTAVAIL;
3329 goto errout;
3330 }
3331
3332 if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) {
3333 err = -ENOBUFS;
3334 goto errout_ifa;
3335 }
3336
3337 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3338 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3339 /* failure implies BUG in inet6_ifaddr_msgsize() */
3340 BUG_ON(err < 0);
3341
3342 err = rtnl_unicast(skb, NETLINK_CB(in_skb).pid);
3343 errout_ifa:
3344 in6_ifa_put(ifa);
3345 errout:
3346 return err;
3347 }
3348
3349 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3350 {
3351 struct sk_buff *skb;
3352 int err = -ENOBUFS;
3353
3354 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3355 if (skb == NULL)
3356 goto errout;
3357
3358 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3359 /* failure implies BUG in inet6_ifaddr_msgsize() */
3360 BUG_ON(err < 0);
3361
3362 err = rtnl_notify(skb, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3363 errout:
3364 if (err < 0)
3365 rtnl_set_sk_err(RTNLGRP_IPV6_IFADDR, err);
3366 }
3367
3368 static void inline ipv6_store_devconf(struct ipv6_devconf *cnf,
3369 __s32 *array, int bytes)
3370 {
3371 BUG_ON(bytes < (DEVCONF_MAX * 4));
3372
3373 memset(array, 0, bytes);
3374 array[DEVCONF_FORWARDING] = cnf->forwarding;
3375 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3376 array[DEVCONF_MTU6] = cnf->mtu6;
3377 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3378 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3379 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3380 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3381 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3382 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3383 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3384 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3385 #ifdef CONFIG_IPV6_PRIVACY
3386 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3387 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3388 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3389 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3390 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3391 #endif
3392 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3393 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3394 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3395 #ifdef CONFIG_IPV6_ROUTER_PREF
3396 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3397 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
3398 #ifdef CONFIG_IPV6_ROUTE_INFO
3399 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3400 #endif
3401 #endif
3402 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3403 }
3404
3405 static inline size_t inet6_if_nlmsg_size(void)
3406 {
3407 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3408 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3409 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3410 + nla_total_size(4) /* IFLA_MTU */
3411 + nla_total_size(4) /* IFLA_LINK */
3412 + nla_total_size( /* IFLA_PROTINFO */
3413 nla_total_size(4) /* IFLA_INET6_FLAGS */
3414 + nla_total_size(sizeof(struct ifla_cacheinfo))
3415 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3416 );
3417 }
3418
3419 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3420 u32 pid, u32 seq, int event, unsigned int flags)
3421 {
3422 struct net_device *dev = idev->dev;
3423 struct nlattr *conf;
3424 struct ifinfomsg *hdr;
3425 struct nlmsghdr *nlh;
3426 void *protoinfo;
3427 struct ifla_cacheinfo ci;
3428
3429 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3430 if (nlh == NULL)
3431 return -ENOBUFS;
3432
3433 hdr = nlmsg_data(nlh);
3434 hdr->ifi_family = AF_INET6;
3435 hdr->__ifi_pad = 0;
3436 hdr->ifi_type = dev->type;
3437 hdr->ifi_index = dev->ifindex;
3438 hdr->ifi_flags = dev_get_flags(dev);
3439 hdr->ifi_change = 0;
3440
3441 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
3442
3443 if (dev->addr_len)
3444 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3445
3446 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
3447 if (dev->ifindex != dev->iflink)
3448 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
3449
3450 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3451 if (protoinfo == NULL)
3452 goto nla_put_failure;
3453
3454 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
3455
3456 ci.max_reasm_len = IPV6_MAXPLEN;
3457 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3458 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3459 ci.reachable_time = idev->nd_parms->reachable_time;
3460 ci.retrans_time = idev->nd_parms->retrans_time;
3461 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3462
3463 conf = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3464 if (conf == NULL)
3465 goto nla_put_failure;
3466 ipv6_store_devconf(&idev->cnf, nla_data(conf), nla_len(conf));
3467
3468 /* XXX - Statistics/MC not implemented */
3469
3470 nla_nest_end(skb, protoinfo);
3471 return nlmsg_end(skb, nlh);
3472
3473 nla_put_failure:
3474 return nlmsg_cancel(skb, nlh);
3475 }
3476
3477 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3478 {
3479 int idx, err;
3480 int s_idx = cb->args[0];
3481 struct net_device *dev;
3482 struct inet6_dev *idev;
3483
3484 read_lock(&dev_base_lock);
3485 for (dev=dev_base, idx=0; dev; dev = dev->next, idx++) {
3486 if (idx < s_idx)
3487 continue;
3488 if ((idev = in6_dev_get(dev)) == NULL)
3489 continue;
3490 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
3491 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
3492 in6_dev_put(idev);
3493 if (err <= 0)
3494 break;
3495 }
3496 read_unlock(&dev_base_lock);
3497 cb->args[0] = idx;
3498
3499 return skb->len;
3500 }
3501
3502 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3503 {
3504 struct sk_buff *skb;
3505 int err = -ENOBUFS;
3506
3507 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
3508 if (skb == NULL)
3509 goto errout;
3510
3511 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
3512 /* failure implies BUG in inet6_if_nlmsg_size() */
3513 BUG_ON(err < 0);
3514
3515 err = rtnl_notify(skb, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3516 errout:
3517 if (err < 0)
3518 rtnl_set_sk_err(RTNLGRP_IPV6_IFADDR, err);
3519 }
3520
3521 static inline size_t inet6_prefix_nlmsg_size(void)
3522 {
3523 return NLMSG_ALIGN(sizeof(struct prefixmsg))
3524 + nla_total_size(sizeof(struct in6_addr))
3525 + nla_total_size(sizeof(struct prefix_cacheinfo));
3526 }
3527
3528 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
3529 struct prefix_info *pinfo, u32 pid, u32 seq,
3530 int event, unsigned int flags)
3531 {
3532 struct prefixmsg *pmsg;
3533 struct nlmsghdr *nlh;
3534 struct prefix_cacheinfo ci;
3535
3536 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
3537 if (nlh == NULL)
3538 return -ENOBUFS;
3539
3540 pmsg = nlmsg_data(nlh);
3541 pmsg->prefix_family = AF_INET6;
3542 pmsg->prefix_pad1 = 0;
3543 pmsg->prefix_pad2 = 0;
3544 pmsg->prefix_ifindex = idev->dev->ifindex;
3545 pmsg->prefix_len = pinfo->prefix_len;
3546 pmsg->prefix_type = pinfo->type;
3547 pmsg->prefix_pad3 = 0;
3548 pmsg->prefix_flags = 0;
3549 if (pinfo->onlink)
3550 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3551 if (pinfo->autoconf)
3552 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3553
3554 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
3555
3556 ci.preferred_time = ntohl(pinfo->prefered);
3557 ci.valid_time = ntohl(pinfo->valid);
3558 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
3559
3560 return nlmsg_end(skb, nlh);
3561
3562 nla_put_failure:
3563 return nlmsg_cancel(skb, nlh);
3564 }
3565
3566 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
3567 struct prefix_info *pinfo)
3568 {
3569 struct sk_buff *skb;
3570 int err = -ENOBUFS;
3571
3572 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
3573 if (skb == NULL)
3574 goto errout;
3575
3576 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
3577 /* failure implies BUG in inet6_prefix_nlmsg_size() */
3578 BUG_ON(err < 0);
3579
3580 err = rtnl_notify(skb, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
3581 errout:
3582 if (err < 0)
3583 rtnl_set_sk_err(RTNLGRP_IPV6_PREFIX, err);
3584 }
3585
3586 static struct rtnetlink_link inet6_rtnetlink_table[RTM_NR_MSGTYPES] = {
3587 [RTM_GETLINK - RTM_BASE] = { .dumpit = inet6_dump_ifinfo, },
3588 [RTM_NEWADDR - RTM_BASE] = { .doit = inet6_rtm_newaddr, },
3589 [RTM_DELADDR - RTM_BASE] = { .doit = inet6_rtm_deladdr, },
3590 [RTM_GETADDR - RTM_BASE] = { .doit = inet6_rtm_getaddr,
3591 .dumpit = inet6_dump_ifaddr, },
3592 [RTM_GETMULTICAST - RTM_BASE] = { .dumpit = inet6_dump_ifmcaddr, },
3593 [RTM_GETANYCAST - RTM_BASE] = { .dumpit = inet6_dump_ifacaddr, },
3594 [RTM_NEWROUTE - RTM_BASE] = { .doit = inet6_rtm_newroute, },
3595 [RTM_DELROUTE - RTM_BASE] = { .doit = inet6_rtm_delroute, },
3596 [RTM_GETROUTE - RTM_BASE] = { .doit = inet6_rtm_getroute,
3597 .dumpit = inet6_dump_fib, },
3598 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3599 [RTM_GETRULE - RTM_BASE] = { .dumpit = fib6_rules_dump, },
3600 #endif
3601 };
3602
3603 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3604 {
3605 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3606
3607 switch (event) {
3608 case RTM_NEWADDR:
3609 ip6_ins_rt(ifp->rt);
3610 if (ifp->idev->cnf.forwarding)
3611 addrconf_join_anycast(ifp);
3612 break;
3613 case RTM_DELADDR:
3614 if (ifp->idev->cnf.forwarding)
3615 addrconf_leave_anycast(ifp);
3616 addrconf_leave_solict(ifp->idev, &ifp->addr);
3617 dst_hold(&ifp->rt->u.dst);
3618 if (ip6_del_rt(ifp->rt))
3619 dst_free(&ifp->rt->u.dst);
3620 break;
3621 }
3622 }
3623
3624 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3625 {
3626 rcu_read_lock_bh();
3627 if (likely(ifp->idev->dead == 0))
3628 __ipv6_ifa_notify(event, ifp);
3629 rcu_read_unlock_bh();
3630 }
3631
3632 #ifdef CONFIG_SYSCTL
3633
3634 static
3635 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3636 void __user *buffer, size_t *lenp, loff_t *ppos)
3637 {
3638 int *valp = ctl->data;
3639 int val = *valp;
3640 int ret;
3641
3642 ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3643
3644 if (write && valp != &ipv6_devconf_dflt.forwarding) {
3645 if (valp != &ipv6_devconf.forwarding) {
3646 if ((!*valp) ^ (!val)) {
3647 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
3648 if (idev == NULL)
3649 return ret;
3650 dev_forward_change(idev);
3651 }
3652 } else {
3653 ipv6_devconf_dflt.forwarding = ipv6_devconf.forwarding;
3654 addrconf_forward_change();
3655 }
3656 if (*valp)
3657 rt6_purge_dflt_routers();
3658 }
3659
3660 return ret;
3661 }
3662
3663 static int addrconf_sysctl_forward_strategy(ctl_table *table,
3664 int __user *name, int nlen,
3665 void __user *oldval,
3666 size_t __user *oldlenp,
3667 void __user *newval, size_t newlen)
3668 {
3669 int *valp = table->data;
3670 int new;
3671
3672 if (!newval || !newlen)
3673 return 0;
3674 if (newlen != sizeof(int))
3675 return -EINVAL;
3676 if (get_user(new, (int __user *)newval))
3677 return -EFAULT;
3678 if (new == *valp)
3679 return 0;
3680 if (oldval && oldlenp) {
3681 size_t len;
3682 if (get_user(len, oldlenp))
3683 return -EFAULT;
3684 if (len) {
3685 if (len > table->maxlen)
3686 len = table->maxlen;
3687 if (copy_to_user(oldval, valp, len))
3688 return -EFAULT;
3689 if (put_user(len, oldlenp))
3690 return -EFAULT;
3691 }
3692 }
3693
3694 if (valp != &ipv6_devconf_dflt.forwarding) {
3695 if (valp != &ipv6_devconf.forwarding) {
3696 struct inet6_dev *idev = (struct inet6_dev *)table->extra1;
3697 int changed;
3698 if (unlikely(idev == NULL))
3699 return -ENODEV;
3700 changed = (!*valp) ^ (!new);
3701 *valp = new;
3702 if (changed)
3703 dev_forward_change(idev);
3704 } else {
3705 *valp = new;
3706 addrconf_forward_change();
3707 }
3708
3709 if (*valp)
3710 rt6_purge_dflt_routers();
3711 } else
3712 *valp = new;
3713
3714 return 1;
3715 }
3716
3717 static struct addrconf_sysctl_table
3718 {
3719 struct ctl_table_header *sysctl_header;
3720 ctl_table addrconf_vars[__NET_IPV6_MAX];
3721 ctl_table addrconf_dev[2];
3722 ctl_table addrconf_conf_dir[2];
3723 ctl_table addrconf_proto_dir[2];
3724 ctl_table addrconf_root_dir[2];
3725 } addrconf_sysctl __read_mostly = {
3726 .sysctl_header = NULL,
3727 .addrconf_vars = {
3728 {
3729 .ctl_name = NET_IPV6_FORWARDING,
3730 .procname = "forwarding",
3731 .data = &ipv6_devconf.forwarding,
3732 .maxlen = sizeof(int),
3733 .mode = 0644,
3734 .proc_handler = &addrconf_sysctl_forward,
3735 .strategy = &addrconf_sysctl_forward_strategy,
3736 },
3737 {
3738 .ctl_name = NET_IPV6_HOP_LIMIT,
3739 .procname = "hop_limit",
3740 .data = &ipv6_devconf.hop_limit,
3741 .maxlen = sizeof(int),
3742 .mode = 0644,
3743 .proc_handler = proc_dointvec,
3744 },
3745 {
3746 .ctl_name = NET_IPV6_MTU,
3747 .procname = "mtu",
3748 .data = &ipv6_devconf.mtu6,
3749 .maxlen = sizeof(int),
3750 .mode = 0644,
3751 .proc_handler = &proc_dointvec,
3752 },
3753 {
3754 .ctl_name = NET_IPV6_ACCEPT_RA,
3755 .procname = "accept_ra",
3756 .data = &ipv6_devconf.accept_ra,
3757 .maxlen = sizeof(int),
3758 .mode = 0644,
3759 .proc_handler = &proc_dointvec,
3760 },
3761 {
3762 .ctl_name = NET_IPV6_ACCEPT_REDIRECTS,
3763 .procname = "accept_redirects",
3764 .data = &ipv6_devconf.accept_redirects,
3765 .maxlen = sizeof(int),
3766 .mode = 0644,
3767 .proc_handler = &proc_dointvec,
3768 },
3769 {
3770 .ctl_name = NET_IPV6_AUTOCONF,
3771 .procname = "autoconf",
3772 .data = &ipv6_devconf.autoconf,
3773 .maxlen = sizeof(int),
3774 .mode = 0644,
3775 .proc_handler = &proc_dointvec,
3776 },
3777 {
3778 .ctl_name = NET_IPV6_DAD_TRANSMITS,
3779 .procname = "dad_transmits",
3780 .data = &ipv6_devconf.dad_transmits,
3781 .maxlen = sizeof(int),
3782 .mode = 0644,
3783 .proc_handler = &proc_dointvec,
3784 },
3785 {
3786 .ctl_name = NET_IPV6_RTR_SOLICITS,
3787 .procname = "router_solicitations",
3788 .data = &ipv6_devconf.rtr_solicits,
3789 .maxlen = sizeof(int),
3790 .mode = 0644,
3791 .proc_handler = &proc_dointvec,
3792 },
3793 {
3794 .ctl_name = NET_IPV6_RTR_SOLICIT_INTERVAL,
3795 .procname = "router_solicitation_interval",
3796 .data = &ipv6_devconf.rtr_solicit_interval,
3797 .maxlen = sizeof(int),
3798 .mode = 0644,
3799 .proc_handler = &proc_dointvec_jiffies,
3800 .strategy = &sysctl_jiffies,
3801 },
3802 {
3803 .ctl_name = NET_IPV6_RTR_SOLICIT_DELAY,
3804 .procname = "router_solicitation_delay",
3805 .data = &ipv6_devconf.rtr_solicit_delay,
3806 .maxlen = sizeof(int),
3807 .mode = 0644,
3808 .proc_handler = &proc_dointvec_jiffies,
3809 .strategy = &sysctl_jiffies,
3810 },
3811 {
3812 .ctl_name = NET_IPV6_FORCE_MLD_VERSION,
3813 .procname = "force_mld_version",
3814 .data = &ipv6_devconf.force_mld_version,
3815 .maxlen = sizeof(int),
3816 .mode = 0644,
3817 .proc_handler = &proc_dointvec,
3818 },
3819 #ifdef CONFIG_IPV6_PRIVACY
3820 {
3821 .ctl_name = NET_IPV6_USE_TEMPADDR,
3822 .procname = "use_tempaddr",
3823 .data = &ipv6_devconf.use_tempaddr,
3824 .maxlen = sizeof(int),
3825 .mode = 0644,
3826 .proc_handler = &proc_dointvec,
3827 },
3828 {
3829 .ctl_name = NET_IPV6_TEMP_VALID_LFT,
3830 .procname = "temp_valid_lft",
3831 .data = &ipv6_devconf.temp_valid_lft,
3832 .maxlen = sizeof(int),
3833 .mode = 0644,
3834 .proc_handler = &proc_dointvec,
3835 },
3836 {
3837 .ctl_name = NET_IPV6_TEMP_PREFERED_LFT,
3838 .procname = "temp_prefered_lft",
3839 .data = &ipv6_devconf.temp_prefered_lft,
3840 .maxlen = sizeof(int),
3841 .mode = 0644,
3842 .proc_handler = &proc_dointvec,
3843 },
3844 {
3845 .ctl_name = NET_IPV6_REGEN_MAX_RETRY,
3846 .procname = "regen_max_retry",
3847 .data = &ipv6_devconf.regen_max_retry,
3848 .maxlen = sizeof(int),
3849 .mode = 0644,
3850 .proc_handler = &proc_dointvec,
3851 },
3852 {
3853 .ctl_name = NET_IPV6_MAX_DESYNC_FACTOR,
3854 .procname = "max_desync_factor",
3855 .data = &ipv6_devconf.max_desync_factor,
3856 .maxlen = sizeof(int),
3857 .mode = 0644,
3858 .proc_handler = &proc_dointvec,
3859 },
3860 #endif
3861 {
3862 .ctl_name = NET_IPV6_MAX_ADDRESSES,
3863 .procname = "max_addresses",
3864 .data = &ipv6_devconf.max_addresses,
3865 .maxlen = sizeof(int),
3866 .mode = 0644,
3867 .proc_handler = &proc_dointvec,
3868 },
3869 {
3870 .ctl_name = NET_IPV6_ACCEPT_RA_DEFRTR,
3871 .procname = "accept_ra_defrtr",
3872 .data = &ipv6_devconf.accept_ra_defrtr,
3873 .maxlen = sizeof(int),
3874 .mode = 0644,
3875 .proc_handler = &proc_dointvec,
3876 },
3877 {
3878 .ctl_name = NET_IPV6_ACCEPT_RA_PINFO,
3879 .procname = "accept_ra_pinfo",
3880 .data = &ipv6_devconf.accept_ra_pinfo,
3881 .maxlen = sizeof(int),
3882 .mode = 0644,
3883 .proc_handler = &proc_dointvec,
3884 },
3885 #ifdef CONFIG_IPV6_ROUTER_PREF
3886 {
3887 .ctl_name = NET_IPV6_ACCEPT_RA_RTR_PREF,
3888 .procname = "accept_ra_rtr_pref",
3889 .data = &ipv6_devconf.accept_ra_rtr_pref,
3890 .maxlen = sizeof(int),
3891 .mode = 0644,
3892 .proc_handler = &proc_dointvec,
3893 },
3894 {
3895 .ctl_name = NET_IPV6_RTR_PROBE_INTERVAL,
3896 .procname = "router_probe_interval",
3897 .data = &ipv6_devconf.rtr_probe_interval,
3898 .maxlen = sizeof(int),
3899 .mode = 0644,
3900 .proc_handler = &proc_dointvec_jiffies,
3901 .strategy = &sysctl_jiffies,
3902 },
3903 #ifdef CONFIG_IPV6_ROUTE_INFO
3904 {
3905 .ctl_name = NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN,
3906 .procname = "accept_ra_rt_info_max_plen",
3907 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
3908 .maxlen = sizeof(int),
3909 .mode = 0644,
3910 .proc_handler = &proc_dointvec,
3911 },
3912 #endif
3913 #endif
3914 {
3915 .ctl_name = NET_IPV6_PROXY_NDP,
3916 .procname = "proxy_ndp",
3917 .data = &ipv6_devconf.proxy_ndp,
3918 .maxlen = sizeof(int),
3919 .mode = 0644,
3920 .proc_handler = &proc_dointvec,
3921 },
3922 {
3923 .ctl_name = 0, /* sentinel */
3924 }
3925 },
3926 .addrconf_dev = {
3927 {
3928 .ctl_name = NET_PROTO_CONF_ALL,
3929 .procname = "all",
3930 .mode = 0555,
3931 .child = addrconf_sysctl.addrconf_vars,
3932 },
3933 {
3934 .ctl_name = 0, /* sentinel */
3935 }
3936 },
3937 .addrconf_conf_dir = {
3938 {
3939 .ctl_name = NET_IPV6_CONF,
3940 .procname = "conf",
3941 .mode = 0555,
3942 .child = addrconf_sysctl.addrconf_dev,
3943 },
3944 {
3945 .ctl_name = 0, /* sentinel */
3946 }
3947 },
3948 .addrconf_proto_dir = {
3949 {
3950 .ctl_name = NET_IPV6,
3951 .procname = "ipv6",
3952 .mode = 0555,
3953 .child = addrconf_sysctl.addrconf_conf_dir,
3954 },
3955 {
3956 .ctl_name = 0, /* sentinel */
3957 }
3958 },
3959 .addrconf_root_dir = {
3960 {
3961 .ctl_name = CTL_NET,
3962 .procname = "net",
3963 .mode = 0555,
3964 .child = addrconf_sysctl.addrconf_proto_dir,
3965 },
3966 {
3967 .ctl_name = 0, /* sentinel */
3968 }
3969 },
3970 };
3971
3972 static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p)
3973 {
3974 int i;
3975 struct net_device *dev = idev ? idev->dev : NULL;
3976 struct addrconf_sysctl_table *t;
3977 char *dev_name = NULL;
3978
3979 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
3980 if (t == NULL)
3981 return;
3982 for (i=0; t->addrconf_vars[i].data; i++) {
3983 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
3984 t->addrconf_vars[i].de = NULL;
3985 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
3986 }
3987 if (dev) {
3988 dev_name = dev->name;
3989 t->addrconf_dev[0].ctl_name = dev->ifindex;
3990 } else {
3991 dev_name = "default";
3992 t->addrconf_dev[0].ctl_name = NET_PROTO_CONF_DEFAULT;
3993 }
3994
3995 /*
3996 * Make a copy of dev_name, because '.procname' is regarded as const
3997 * by sysctl and we wouldn't want anyone to change it under our feet
3998 * (see SIOCSIFNAME).
3999 */
4000 dev_name = kstrdup(dev_name, GFP_KERNEL);
4001 if (!dev_name)
4002 goto free;
4003
4004 t->addrconf_dev[0].procname = dev_name;
4005
4006 t->addrconf_dev[0].child = t->addrconf_vars;
4007 t->addrconf_dev[0].de = NULL;
4008 t->addrconf_conf_dir[0].child = t->addrconf_dev;
4009 t->addrconf_conf_dir[0].de = NULL;
4010 t->addrconf_proto_dir[0].child = t->addrconf_conf_dir;
4011 t->addrconf_proto_dir[0].de = NULL;
4012 t->addrconf_root_dir[0].child = t->addrconf_proto_dir;
4013 t->addrconf_root_dir[0].de = NULL;
4014
4015 t->sysctl_header = register_sysctl_table(t->addrconf_root_dir, 0);
4016 if (t->sysctl_header == NULL)
4017 goto free_procname;
4018 else
4019 p->sysctl = t;
4020 return;
4021
4022 /* error path */
4023 free_procname:
4024 kfree(dev_name);
4025 free:
4026 kfree(t);
4027
4028 return;
4029 }
4030
4031 static void addrconf_sysctl_unregister(struct ipv6_devconf *p)
4032 {
4033 if (p->sysctl) {
4034 struct addrconf_sysctl_table *t = p->sysctl;
4035 p->sysctl = NULL;
4036 unregister_sysctl_table(t->sysctl_header);
4037 kfree(t->addrconf_dev[0].procname);
4038 kfree(t);
4039 }
4040 }
4041
4042
4043 #endif
4044
4045 /*
4046 * Device notifier
4047 */
4048
4049 int register_inet6addr_notifier(struct notifier_block *nb)
4050 {
4051 return atomic_notifier_chain_register(&inet6addr_chain, nb);
4052 }
4053
4054 int unregister_inet6addr_notifier(struct notifier_block *nb)
4055 {
4056 return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
4057 }
4058
4059 /*
4060 * Init / cleanup code
4061 */
4062
4063 int __init addrconf_init(void)
4064 {
4065 int err = 0;
4066
4067 /* The addrconf netdev notifier requires that loopback_dev
4068 * has it's ipv6 private information allocated and setup
4069 * before it can bring up and give link-local addresses
4070 * to other devices which are up.
4071 *
4072 * Unfortunately, loopback_dev is not necessarily the first
4073 * entry in the global dev_base list of net devices. In fact,
4074 * it is likely to be the very last entry on that list.
4075 * So this causes the notifier registry below to try and
4076 * give link-local addresses to all devices besides loopback_dev
4077 * first, then loopback_dev, which cases all the non-loopback_dev
4078 * devices to fail to get a link-local address.
4079 *
4080 * So, as a temporary fix, allocate the ipv6 structure for
4081 * loopback_dev first by hand.
4082 * Longer term, all of the dependencies ipv6 has upon the loopback
4083 * device and it being up should be removed.
4084 */
4085 rtnl_lock();
4086 if (!ipv6_add_dev(&loopback_dev))
4087 err = -ENOMEM;
4088 rtnl_unlock();
4089 if (err)
4090 return err;
4091
4092 ip6_null_entry.rt6i_idev = in6_dev_get(&loopback_dev);
4093
4094 register_netdevice_notifier(&ipv6_dev_notf);
4095
4096 addrconf_verify(0);
4097 rtnetlink_links[PF_INET6] = inet6_rtnetlink_table;
4098 #ifdef CONFIG_SYSCTL
4099 addrconf_sysctl.sysctl_header =
4100 register_sysctl_table(addrconf_sysctl.addrconf_root_dir, 0);
4101 addrconf_sysctl_register(NULL, &ipv6_devconf_dflt);
4102 #endif
4103
4104 return 0;
4105 }
4106
4107 void __exit addrconf_cleanup(void)
4108 {
4109 struct net_device *dev;
4110 struct inet6_dev *idev;
4111 struct inet6_ifaddr *ifa;
4112 int i;
4113
4114 unregister_netdevice_notifier(&ipv6_dev_notf);
4115
4116 rtnetlink_links[PF_INET6] = NULL;
4117 #ifdef CONFIG_SYSCTL
4118 addrconf_sysctl_unregister(&ipv6_devconf_dflt);
4119 addrconf_sysctl_unregister(&ipv6_devconf);
4120 #endif
4121
4122 rtnl_lock();
4123
4124 /*
4125 * clean dev list.
4126 */
4127
4128 for (dev=dev_base; dev; dev=dev->next) {
4129 if ((idev = __in6_dev_get(dev)) == NULL)
4130 continue;
4131 addrconf_ifdown(dev, 1);
4132 }
4133 addrconf_ifdown(&loopback_dev, 2);
4134
4135 /*
4136 * Check hash table.
4137 */
4138
4139 write_lock_bh(&addrconf_hash_lock);
4140 for (i=0; i < IN6_ADDR_HSIZE; i++) {
4141 for (ifa=inet6_addr_lst[i]; ifa; ) {
4142 struct inet6_ifaddr *bifa;
4143
4144 bifa = ifa;
4145 ifa = ifa->lst_next;
4146 printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
4147 /* Do not free it; something is wrong.
4148 Now we can investigate it with debugger.
4149 */
4150 }
4151 }
4152 write_unlock_bh(&addrconf_hash_lock);
4153
4154 del_timer(&addr_chk_timer);
4155
4156 rtnl_unlock();
4157
4158 #ifdef CONFIG_PROC_FS
4159 proc_net_remove("if_inet6");
4160 #endif
4161 }
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree