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Merge branch 'merge'
[deliverable/linux.git] / net / ipv6 / addrconf.c
1 /*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
9 * $Id: addrconf.c,v 1.69 2001/10/31 21:55:54 davem Exp $
10 *
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License
13 * as published by the Free Software Foundation; either version
14 * 2 of the License, or (at your option) any later version.
15 */
16
17 /*
18 * Changes:
19 *
20 * Janos Farkas : delete timer on ifdown
21 * <chexum@bankinf.banki.hu>
22 * Andi Kleen : kill double kfree on module
23 * unload.
24 * Maciej W. Rozycki : FDDI support
25 * sekiya@USAGI : Don't send too many RS
26 * packets.
27 * yoshfuji@USAGI : Fixed interval between DAD
28 * packets.
29 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
30 * address validation timer.
31 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
32 * support.
33 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
34 * address on a same interface.
35 * YOSHIFUJI Hideaki @USAGI : ARCnet support
36 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
37 * seq_file.
38 * YOSHIFUJI Hideaki @USAGI : improved source address
39 * selection; consider scope,
40 * status etc.
41 */
42
43 #include <linux/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_arp.h>
52 #include <linux/if_arcnet.h>
53 #include <linux/if_infiniband.h>
54 #include <linux/route.h>
55 #include <linux/inetdevice.h>
56 #include <linux/init.h>
57 #ifdef CONFIG_SYSCTL
58 #include <linux/sysctl.h>
59 #endif
60 #include <linux/capability.h>
61 #include <linux/delay.h>
62 #include <linux/notifier.h>
63 #include <linux/string.h>
64
65 #include <net/sock.h>
66 #include <net/snmp.h>
67
68 #include <net/ipv6.h>
69 #include <net/protocol.h>
70 #include <net/ndisc.h>
71 #include <net/ip6_route.h>
72 #include <net/addrconf.h>
73 #include <net/tcp.h>
74 #include <net/ip.h>
75 #include <linux/if_tunnel.h>
76 #include <linux/rtnetlink.h>
77
78 #ifdef CONFIG_IPV6_PRIVACY
79 #include <linux/random.h>
80 #endif
81
82 #include <asm/uaccess.h>
83
84 #include <linux/proc_fs.h>
85 #include <linux/seq_file.h>
86
87 /* Set to 3 to get tracing... */
88 #define ACONF_DEBUG 2
89
90 #if ACONF_DEBUG >= 3
91 #define ADBG(x) printk x
92 #else
93 #define ADBG(x)
94 #endif
95
96 #define INFINITY_LIFE_TIME 0xFFFFFFFF
97 #define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b)))
98
99 #ifdef CONFIG_SYSCTL
100 static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p);
101 static void addrconf_sysctl_unregister(struct ipv6_devconf *p);
102 #endif
103
104 #ifdef CONFIG_IPV6_PRIVACY
105 static int __ipv6_regen_rndid(struct inet6_dev *idev);
106 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
107 static void ipv6_regen_rndid(unsigned long data);
108
109 static int desync_factor = MAX_DESYNC_FACTOR * HZ;
110 #endif
111
112 static int ipv6_count_addresses(struct inet6_dev *idev);
113
114 /*
115 * Configured unicast address hash table
116 */
117 static struct inet6_ifaddr *inet6_addr_lst[IN6_ADDR_HSIZE];
118 static DEFINE_RWLOCK(addrconf_hash_lock);
119
120 /* Protects inet6 devices */
121 DEFINE_RWLOCK(addrconf_lock);
122
123 static void addrconf_verify(unsigned long);
124
125 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
126 static DEFINE_SPINLOCK(addrconf_verify_lock);
127
128 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
129 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
130
131 static int addrconf_ifdown(struct net_device *dev, int how);
132
133 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
134 static void addrconf_dad_timer(unsigned long data);
135 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
136 static void addrconf_dad_run(struct inet6_dev *idev);
137 static void addrconf_rs_timer(unsigned long data);
138 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
139 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
140
141 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
142 struct prefix_info *pinfo);
143 static int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev);
144
145 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
146
147 struct ipv6_devconf ipv6_devconf = {
148 .forwarding = 0,
149 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
150 .mtu6 = IPV6_MIN_MTU,
151 .accept_ra = 1,
152 .accept_redirects = 1,
153 .autoconf = 1,
154 .force_mld_version = 0,
155 .dad_transmits = 1,
156 .rtr_solicits = MAX_RTR_SOLICITATIONS,
157 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
158 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
159 #ifdef CONFIG_IPV6_PRIVACY
160 .use_tempaddr = 0,
161 .temp_valid_lft = TEMP_VALID_LIFETIME,
162 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
163 .regen_max_retry = REGEN_MAX_RETRY,
164 .max_desync_factor = MAX_DESYNC_FACTOR,
165 #endif
166 .max_addresses = IPV6_MAX_ADDRESSES,
167 .accept_ra_defrtr = 1,
168 .accept_ra_pinfo = 1,
169 #ifdef CONFIG_IPV6_ROUTER_PREF
170 .accept_ra_rtr_pref = 1,
171 .rtr_probe_interval = 60 * HZ,
172 #ifdef CONFIG_IPV6_ROUTE_INFO
173 .accept_ra_rt_info_max_plen = 0,
174 #endif
175 #endif
176 };
177
178 static struct ipv6_devconf ipv6_devconf_dflt = {
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 };
207
208 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
209 #if 0
210 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
211 #endif
212 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
213
214 #define IPV6_ADDR_SCOPE_TYPE(scope) ((scope) << 16)
215
216 static inline unsigned ipv6_addr_scope2type(unsigned scope)
217 {
218 switch(scope) {
219 case IPV6_ADDR_SCOPE_NODELOCAL:
220 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_NODELOCAL) |
221 IPV6_ADDR_LOOPBACK);
222 case IPV6_ADDR_SCOPE_LINKLOCAL:
223 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL) |
224 IPV6_ADDR_LINKLOCAL);
225 case IPV6_ADDR_SCOPE_SITELOCAL:
226 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_SITELOCAL) |
227 IPV6_ADDR_SITELOCAL);
228 }
229 return IPV6_ADDR_SCOPE_TYPE(scope);
230 }
231
232 int __ipv6_addr_type(const struct in6_addr *addr)
233 {
234 u32 st;
235
236 st = addr->s6_addr32[0];
237
238 /* Consider all addresses with the first three bits different of
239 000 and 111 as unicasts.
240 */
241 if ((st & htonl(0xE0000000)) != htonl(0x00000000) &&
242 (st & htonl(0xE0000000)) != htonl(0xE0000000))
243 return (IPV6_ADDR_UNICAST |
244 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));
245
246 if ((st & htonl(0xFF000000)) == htonl(0xFF000000)) {
247 /* multicast */
248 /* addr-select 3.1 */
249 return (IPV6_ADDR_MULTICAST |
250 ipv6_addr_scope2type(IPV6_ADDR_MC_SCOPE(addr)));
251 }
252
253 if ((st & htonl(0xFFC00000)) == htonl(0xFE800000))
254 return (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_UNICAST |
255 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL)); /* addr-select 3.1 */
256 if ((st & htonl(0xFFC00000)) == htonl(0xFEC00000))
257 return (IPV6_ADDR_SITELOCAL | IPV6_ADDR_UNICAST |
258 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_SITELOCAL)); /* addr-select 3.1 */
259
260 if ((addr->s6_addr32[0] | addr->s6_addr32[1]) == 0) {
261 if (addr->s6_addr32[2] == 0) {
262 if (addr->s6_addr32[3] == 0)
263 return IPV6_ADDR_ANY;
264
265 if (addr->s6_addr32[3] == htonl(0x00000001))
266 return (IPV6_ADDR_LOOPBACK | IPV6_ADDR_UNICAST |
267 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL)); /* addr-select 3.4 */
268
269 return (IPV6_ADDR_COMPATv4 | IPV6_ADDR_UNICAST |
270 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* addr-select 3.3 */
271 }
272
273 if (addr->s6_addr32[2] == htonl(0x0000ffff))
274 return (IPV6_ADDR_MAPPED |
275 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* addr-select 3.3 */
276 }
277
278 return (IPV6_ADDR_RESERVED |
279 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* addr-select 3.4 */
280 }
281
282 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
283 {
284 if (del_timer(&ifp->timer))
285 __in6_ifa_put(ifp);
286 }
287
288 enum addrconf_timer_t
289 {
290 AC_NONE,
291 AC_DAD,
292 AC_RS,
293 };
294
295 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
296 enum addrconf_timer_t what,
297 unsigned long when)
298 {
299 if (!del_timer(&ifp->timer))
300 in6_ifa_hold(ifp);
301
302 switch (what) {
303 case AC_DAD:
304 ifp->timer.function = addrconf_dad_timer;
305 break;
306 case AC_RS:
307 ifp->timer.function = addrconf_rs_timer;
308 break;
309 default:;
310 }
311 ifp->timer.expires = jiffies + when;
312 add_timer(&ifp->timer);
313 }
314
315 /* Nobody refers to this device, we may destroy it. */
316
317 void in6_dev_finish_destroy(struct inet6_dev *idev)
318 {
319 struct net_device *dev = idev->dev;
320 BUG_TRAP(idev->addr_list==NULL);
321 BUG_TRAP(idev->mc_list==NULL);
322 #ifdef NET_REFCNT_DEBUG
323 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
324 #endif
325 dev_put(dev);
326 if (!idev->dead) {
327 printk("Freeing alive inet6 device %p\n", idev);
328 return;
329 }
330 snmp6_free_dev(idev);
331 kfree(idev);
332 }
333
334 static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
335 {
336 struct inet6_dev *ndev;
337
338 ASSERT_RTNL();
339
340 if (dev->mtu < IPV6_MIN_MTU)
341 return NULL;
342
343 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
344
345 if (ndev == NULL)
346 return NULL;
347
348 rwlock_init(&ndev->lock);
349 ndev->dev = dev;
350 memcpy(&ndev->cnf, &ipv6_devconf_dflt, sizeof(ndev->cnf));
351 ndev->cnf.mtu6 = dev->mtu;
352 ndev->cnf.sysctl = NULL;
353 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
354 if (ndev->nd_parms == NULL) {
355 kfree(ndev);
356 return NULL;
357 }
358 /* We refer to the device */
359 dev_hold(dev);
360
361 if (snmp6_alloc_dev(ndev) < 0) {
362 ADBG((KERN_WARNING
363 "%s(): cannot allocate memory for statistics; dev=%s.\n",
364 __FUNCTION__, dev->name));
365 neigh_parms_release(&nd_tbl, ndev->nd_parms);
366 ndev->dead = 1;
367 in6_dev_finish_destroy(ndev);
368 return NULL;
369 }
370
371 if (snmp6_register_dev(ndev) < 0) {
372 ADBG((KERN_WARNING
373 "%s(): cannot create /proc/net/dev_snmp6/%s\n",
374 __FUNCTION__, dev->name));
375 neigh_parms_release(&nd_tbl, ndev->nd_parms);
376 ndev->dead = 1;
377 in6_dev_finish_destroy(ndev);
378 return NULL;
379 }
380
381 /* One reference from device. We must do this before
382 * we invoke __ipv6_regen_rndid().
383 */
384 in6_dev_hold(ndev);
385
386 #ifdef CONFIG_IPV6_PRIVACY
387 init_timer(&ndev->regen_timer);
388 ndev->regen_timer.function = ipv6_regen_rndid;
389 ndev->regen_timer.data = (unsigned long) ndev;
390 if ((dev->flags&IFF_LOOPBACK) ||
391 dev->type == ARPHRD_TUNNEL ||
392 dev->type == ARPHRD_NONE ||
393 dev->type == ARPHRD_SIT) {
394 printk(KERN_INFO
395 "%s: Disabled Privacy Extensions\n",
396 dev->name);
397 ndev->cnf.use_tempaddr = -1;
398 } else {
399 in6_dev_hold(ndev);
400 ipv6_regen_rndid((unsigned long) ndev);
401 }
402 #endif
403
404 if (netif_carrier_ok(dev))
405 ndev->if_flags |= IF_READY;
406
407 write_lock_bh(&addrconf_lock);
408 dev->ip6_ptr = ndev;
409 write_unlock_bh(&addrconf_lock);
410
411 ipv6_mc_init_dev(ndev);
412 ndev->tstamp = jiffies;
413 #ifdef CONFIG_SYSCTL
414 neigh_sysctl_register(dev, ndev->nd_parms, NET_IPV6,
415 NET_IPV6_NEIGH, "ipv6",
416 &ndisc_ifinfo_sysctl_change,
417 NULL);
418 addrconf_sysctl_register(ndev, &ndev->cnf);
419 #endif
420 return ndev;
421 }
422
423 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
424 {
425 struct inet6_dev *idev;
426
427 ASSERT_RTNL();
428
429 if ((idev = __in6_dev_get(dev)) == NULL) {
430 if ((idev = ipv6_add_dev(dev)) == NULL)
431 return NULL;
432 }
433
434 if (dev->flags&IFF_UP)
435 ipv6_mc_up(idev);
436 return idev;
437 }
438
439 #ifdef CONFIG_SYSCTL
440 static void dev_forward_change(struct inet6_dev *idev)
441 {
442 struct net_device *dev;
443 struct inet6_ifaddr *ifa;
444 struct in6_addr addr;
445
446 if (!idev)
447 return;
448 dev = idev->dev;
449 if (dev && (dev->flags & IFF_MULTICAST)) {
450 ipv6_addr_all_routers(&addr);
451
452 if (idev->cnf.forwarding)
453 ipv6_dev_mc_inc(dev, &addr);
454 else
455 ipv6_dev_mc_dec(dev, &addr);
456 }
457 for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
458 if (idev->cnf.forwarding)
459 addrconf_join_anycast(ifa);
460 else
461 addrconf_leave_anycast(ifa);
462 }
463 }
464
465
466 static void addrconf_forward_change(void)
467 {
468 struct net_device *dev;
469 struct inet6_dev *idev;
470
471 read_lock(&dev_base_lock);
472 for (dev=dev_base; dev; dev=dev->next) {
473 read_lock(&addrconf_lock);
474 idev = __in6_dev_get(dev);
475 if (idev) {
476 int changed = (!idev->cnf.forwarding) ^ (!ipv6_devconf.forwarding);
477 idev->cnf.forwarding = ipv6_devconf.forwarding;
478 if (changed)
479 dev_forward_change(idev);
480 }
481 read_unlock(&addrconf_lock);
482 }
483 read_unlock(&dev_base_lock);
484 }
485 #endif
486
487 /* Nobody refers to this ifaddr, destroy it */
488
489 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
490 {
491 BUG_TRAP(ifp->if_next==NULL);
492 BUG_TRAP(ifp->lst_next==NULL);
493 #ifdef NET_REFCNT_DEBUG
494 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
495 #endif
496
497 in6_dev_put(ifp->idev);
498
499 if (del_timer(&ifp->timer))
500 printk("Timer is still running, when freeing ifa=%p\n", ifp);
501
502 if (!ifp->dead) {
503 printk("Freeing alive inet6 address %p\n", ifp);
504 return;
505 }
506 dst_release(&ifp->rt->u.dst);
507
508 kfree(ifp);
509 }
510
511 static void
512 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
513 {
514 struct inet6_ifaddr *ifa, **ifap;
515 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
516
517 /*
518 * Each device address list is sorted in order of scope -
519 * global before linklocal.
520 */
521 for (ifap = &idev->addr_list; (ifa = *ifap) != NULL;
522 ifap = &ifa->if_next) {
523 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
524 break;
525 }
526
527 ifp->if_next = *ifap;
528 *ifap = ifp;
529 }
530
531 /* On success it returns ifp with increased reference count */
532
533 static struct inet6_ifaddr *
534 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
535 int scope, u32 flags)
536 {
537 struct inet6_ifaddr *ifa = NULL;
538 struct rt6_info *rt;
539 int hash;
540 int err = 0;
541
542 read_lock_bh(&addrconf_lock);
543 if (idev->dead) {
544 err = -ENODEV; /*XXX*/
545 goto out2;
546 }
547
548 write_lock(&addrconf_hash_lock);
549
550 /* Ignore adding duplicate addresses on an interface */
551 if (ipv6_chk_same_addr(addr, idev->dev)) {
552 ADBG(("ipv6_add_addr: already assigned\n"));
553 err = -EEXIST;
554 goto out;
555 }
556
557 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
558
559 if (ifa == NULL) {
560 ADBG(("ipv6_add_addr: malloc failed\n"));
561 err = -ENOBUFS;
562 goto out;
563 }
564
565 rt = addrconf_dst_alloc(idev, addr, 0);
566 if (IS_ERR(rt)) {
567 err = PTR_ERR(rt);
568 goto out;
569 }
570
571 ipv6_addr_copy(&ifa->addr, addr);
572
573 spin_lock_init(&ifa->lock);
574 init_timer(&ifa->timer);
575 ifa->timer.data = (unsigned long) ifa;
576 ifa->scope = scope;
577 ifa->prefix_len = pfxlen;
578 ifa->flags = flags | IFA_F_TENTATIVE;
579 ifa->cstamp = ifa->tstamp = jiffies;
580
581 ifa->idev = idev;
582 in6_dev_hold(idev);
583 /* For caller */
584 in6_ifa_hold(ifa);
585
586 /* Add to big hash table */
587 hash = ipv6_addr_hash(addr);
588
589 ifa->lst_next = inet6_addr_lst[hash];
590 inet6_addr_lst[hash] = ifa;
591 in6_ifa_hold(ifa);
592 write_unlock(&addrconf_hash_lock);
593
594 write_lock(&idev->lock);
595 /* Add to inet6_dev unicast addr list. */
596 ipv6_link_dev_addr(idev, ifa);
597
598 #ifdef CONFIG_IPV6_PRIVACY
599 if (ifa->flags&IFA_F_TEMPORARY) {
600 ifa->tmp_next = idev->tempaddr_list;
601 idev->tempaddr_list = ifa;
602 in6_ifa_hold(ifa);
603 }
604 #endif
605
606 ifa->rt = rt;
607
608 in6_ifa_hold(ifa);
609 write_unlock(&idev->lock);
610 out2:
611 read_unlock_bh(&addrconf_lock);
612
613 if (likely(err == 0))
614 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
615 else {
616 kfree(ifa);
617 ifa = ERR_PTR(err);
618 }
619
620 return ifa;
621 out:
622 write_unlock(&addrconf_hash_lock);
623 goto out2;
624 }
625
626 /* This function wants to get referenced ifp and releases it before return */
627
628 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
629 {
630 struct inet6_ifaddr *ifa, **ifap;
631 struct inet6_dev *idev = ifp->idev;
632 int hash;
633 int deleted = 0, onlink = 0;
634 unsigned long expires = jiffies;
635
636 hash = ipv6_addr_hash(&ifp->addr);
637
638 ifp->dead = 1;
639
640 write_lock_bh(&addrconf_hash_lock);
641 for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
642 ifap = &ifa->lst_next) {
643 if (ifa == ifp) {
644 *ifap = ifa->lst_next;
645 __in6_ifa_put(ifp);
646 ifa->lst_next = NULL;
647 break;
648 }
649 }
650 write_unlock_bh(&addrconf_hash_lock);
651
652 write_lock_bh(&idev->lock);
653 #ifdef CONFIG_IPV6_PRIVACY
654 if (ifp->flags&IFA_F_TEMPORARY) {
655 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
656 ifap = &ifa->tmp_next) {
657 if (ifa == ifp) {
658 *ifap = ifa->tmp_next;
659 if (ifp->ifpub) {
660 in6_ifa_put(ifp->ifpub);
661 ifp->ifpub = NULL;
662 }
663 __in6_ifa_put(ifp);
664 ifa->tmp_next = NULL;
665 break;
666 }
667 }
668 }
669 #endif
670
671 for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
672 if (ifa == ifp) {
673 *ifap = ifa->if_next;
674 __in6_ifa_put(ifp);
675 ifa->if_next = NULL;
676 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
677 break;
678 deleted = 1;
679 continue;
680 } else if (ifp->flags & IFA_F_PERMANENT) {
681 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
682 ifp->prefix_len)) {
683 if (ifa->flags & IFA_F_PERMANENT) {
684 onlink = 1;
685 if (deleted)
686 break;
687 } else {
688 unsigned long lifetime;
689
690 if (!onlink)
691 onlink = -1;
692
693 spin_lock(&ifa->lock);
694 lifetime = min_t(unsigned long,
695 ifa->valid_lft, 0x7fffffffUL/HZ);
696 if (time_before(expires,
697 ifa->tstamp + lifetime * HZ))
698 expires = ifa->tstamp + lifetime * HZ;
699 spin_unlock(&ifa->lock);
700 }
701 }
702 }
703 ifap = &ifa->if_next;
704 }
705 write_unlock_bh(&idev->lock);
706
707 ipv6_ifa_notify(RTM_DELADDR, ifp);
708
709 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
710
711 addrconf_del_timer(ifp);
712
713 /*
714 * Purge or update corresponding prefix
715 *
716 * 1) we don't purge prefix here if address was not permanent.
717 * prefix is managed by its own lifetime.
718 * 2) if there're no addresses, delete prefix.
719 * 3) if there're still other permanent address(es),
720 * corresponding prefix is still permanent.
721 * 4) otherwise, update prefix lifetime to the
722 * longest valid lifetime among the corresponding
723 * addresses on the device.
724 * Note: subsequent RA will update lifetime.
725 *
726 * --yoshfuji
727 */
728 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
729 struct in6_addr prefix;
730 struct rt6_info *rt;
731
732 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
733 rt = rt6_lookup(&prefix, NULL, ifp->idev->dev->ifindex, 1);
734
735 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
736 if (onlink == 0) {
737 ip6_del_rt(rt, NULL, NULL, NULL);
738 rt = NULL;
739 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
740 rt->rt6i_expires = expires;
741 rt->rt6i_flags |= RTF_EXPIRES;
742 }
743 }
744 dst_release(&rt->u.dst);
745 }
746
747 in6_ifa_put(ifp);
748 }
749
750 #ifdef CONFIG_IPV6_PRIVACY
751 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
752 {
753 struct inet6_dev *idev = ifp->idev;
754 struct in6_addr addr, *tmpaddr;
755 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
756 int tmp_plen;
757 int ret = 0;
758 int max_addresses;
759
760 write_lock(&idev->lock);
761 if (ift) {
762 spin_lock_bh(&ift->lock);
763 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
764 spin_unlock_bh(&ift->lock);
765 tmpaddr = &addr;
766 } else {
767 tmpaddr = NULL;
768 }
769 retry:
770 in6_dev_hold(idev);
771 if (idev->cnf.use_tempaddr <= 0) {
772 write_unlock(&idev->lock);
773 printk(KERN_INFO
774 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
775 in6_dev_put(idev);
776 ret = -1;
777 goto out;
778 }
779 spin_lock_bh(&ifp->lock);
780 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
781 idev->cnf.use_tempaddr = -1; /*XXX*/
782 spin_unlock_bh(&ifp->lock);
783 write_unlock(&idev->lock);
784 printk(KERN_WARNING
785 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
786 in6_dev_put(idev);
787 ret = -1;
788 goto out;
789 }
790 in6_ifa_hold(ifp);
791 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
792 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
793 spin_unlock_bh(&ifp->lock);
794 write_unlock(&idev->lock);
795 printk(KERN_WARNING
796 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
797 in6_ifa_put(ifp);
798 in6_dev_put(idev);
799 ret = -1;
800 goto out;
801 }
802 memcpy(&addr.s6_addr[8], idev->rndid, 8);
803 tmp_valid_lft = min_t(__u32,
804 ifp->valid_lft,
805 idev->cnf.temp_valid_lft);
806 tmp_prefered_lft = min_t(__u32,
807 ifp->prefered_lft,
808 idev->cnf.temp_prefered_lft - desync_factor / HZ);
809 tmp_plen = ifp->prefix_len;
810 max_addresses = idev->cnf.max_addresses;
811 tmp_cstamp = ifp->cstamp;
812 tmp_tstamp = ifp->tstamp;
813 spin_unlock_bh(&ifp->lock);
814
815 write_unlock(&idev->lock);
816 ift = !max_addresses ||
817 ipv6_count_addresses(idev) < max_addresses ?
818 ipv6_add_addr(idev, &addr, tmp_plen,
819 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK, IFA_F_TEMPORARY) : NULL;
820 if (!ift || IS_ERR(ift)) {
821 in6_ifa_put(ifp);
822 in6_dev_put(idev);
823 printk(KERN_INFO
824 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
825 tmpaddr = &addr;
826 write_lock(&idev->lock);
827 goto retry;
828 }
829
830 spin_lock_bh(&ift->lock);
831 ift->ifpub = ifp;
832 ift->valid_lft = tmp_valid_lft;
833 ift->prefered_lft = tmp_prefered_lft;
834 ift->cstamp = tmp_cstamp;
835 ift->tstamp = tmp_tstamp;
836 spin_unlock_bh(&ift->lock);
837
838 addrconf_dad_start(ift, 0);
839 in6_ifa_put(ift);
840 in6_dev_put(idev);
841 out:
842 return ret;
843 }
844 #endif
845
846 /*
847 * Choose an appropriate source address (RFC3484)
848 */
849 struct ipv6_saddr_score {
850 int addr_type;
851 unsigned int attrs;
852 int matchlen;
853 int scope;
854 unsigned int rule;
855 };
856
857 #define IPV6_SADDR_SCORE_LOCAL 0x0001
858 #define IPV6_SADDR_SCORE_PREFERRED 0x0004
859 #define IPV6_SADDR_SCORE_HOA 0x0008
860 #define IPV6_SADDR_SCORE_OIF 0x0010
861 #define IPV6_SADDR_SCORE_LABEL 0x0020
862 #define IPV6_SADDR_SCORE_PRIVACY 0x0040
863
864 static int inline ipv6_saddr_preferred(int type)
865 {
866 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
867 IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
868 return 1;
869 return 0;
870 }
871
872 /* static matching label */
873 static int inline ipv6_saddr_label(const struct in6_addr *addr, int type)
874 {
875 /*
876 * prefix (longest match) label
877 * -----------------------------
878 * ::1/128 0
879 * ::/0 1
880 * 2002::/16 2
881 * ::/96 3
882 * ::ffff:0:0/96 4
883 * fc00::/7 5
884 * 2001::/32 6
885 */
886 if (type & IPV6_ADDR_LOOPBACK)
887 return 0;
888 else if (type & IPV6_ADDR_COMPATv4)
889 return 3;
890 else if (type & IPV6_ADDR_MAPPED)
891 return 4;
892 else if (addr->s6_addr32[0] == htonl(0x20010000))
893 return 6;
894 else if (addr->s6_addr16[0] == htons(0x2002))
895 return 2;
896 else if ((addr->s6_addr[0] & 0xfe) == 0xfc)
897 return 5;
898 return 1;
899 }
900
901 int ipv6_dev_get_saddr(struct net_device *daddr_dev,
902 struct in6_addr *daddr, struct in6_addr *saddr)
903 {
904 struct ipv6_saddr_score hiscore;
905 struct inet6_ifaddr *ifa_result = NULL;
906 int daddr_type = __ipv6_addr_type(daddr);
907 int daddr_scope = __ipv6_addr_src_scope(daddr_type);
908 u32 daddr_label = ipv6_saddr_label(daddr, daddr_type);
909 struct net_device *dev;
910
911 memset(&hiscore, 0, sizeof(hiscore));
912
913 read_lock(&dev_base_lock);
914 read_lock(&addrconf_lock);
915
916 for (dev = dev_base; dev; dev=dev->next) {
917 struct inet6_dev *idev;
918 struct inet6_ifaddr *ifa;
919
920 /* Rule 0: Candidate Source Address (section 4)
921 * - multicast and link-local destination address,
922 * the set of candidate source address MUST only
923 * include addresses assigned to interfaces
924 * belonging to the same link as the outgoing
925 * interface.
926 * (- For site-local destination addresses, the
927 * set of candidate source addresses MUST only
928 * include addresses assigned to interfaces
929 * belonging to the same site as the outgoing
930 * interface.)
931 */
932 if ((daddr_type & IPV6_ADDR_MULTICAST ||
933 daddr_scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
934 daddr_dev && dev != daddr_dev)
935 continue;
936
937 idev = __in6_dev_get(dev);
938 if (!idev)
939 continue;
940
941 read_lock_bh(&idev->lock);
942 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
943 struct ipv6_saddr_score score;
944
945 score.addr_type = __ipv6_addr_type(&ifa->addr);
946
947 /* Rule 0:
948 * - Tentative Address (RFC2462 section 5.4)
949 * - A tentative address is not considered
950 * "assigned to an interface" in the traditional
951 * sense.
952 * - Candidate Source Address (section 4)
953 * - In any case, anycast addresses, multicast
954 * addresses, and the unspecified address MUST
955 * NOT be included in a candidate set.
956 */
957 if (ifa->flags & IFA_F_TENTATIVE)
958 continue;
959 if (unlikely(score.addr_type == IPV6_ADDR_ANY ||
960 score.addr_type & IPV6_ADDR_MULTICAST)) {
961 LIMIT_NETDEBUG(KERN_DEBUG
962 "ADDRCONF: unspecified / multicast address"
963 "assigned as unicast address on %s",
964 dev->name);
965 continue;
966 }
967
968 score.attrs = 0;
969 score.matchlen = 0;
970 score.scope = 0;
971 score.rule = 0;
972
973 if (ifa_result == NULL) {
974 /* record it if the first available entry */
975 goto record_it;
976 }
977
978 /* Rule 1: Prefer same address */
979 if (hiscore.rule < 1) {
980 if (ipv6_addr_equal(&ifa_result->addr, daddr))
981 hiscore.attrs |= IPV6_SADDR_SCORE_LOCAL;
982 hiscore.rule++;
983 }
984 if (ipv6_addr_equal(&ifa->addr, daddr)) {
985 score.attrs |= IPV6_SADDR_SCORE_LOCAL;
986 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)) {
987 score.rule = 1;
988 goto record_it;
989 }
990 } else {
991 if (hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)
992 continue;
993 }
994
995 /* Rule 2: Prefer appropriate scope */
996 if (hiscore.rule < 2) {
997 hiscore.scope = __ipv6_addr_src_scope(hiscore.addr_type);
998 hiscore.rule++;
999 }
1000 score.scope = __ipv6_addr_src_scope(score.addr_type);
1001 if (hiscore.scope < score.scope) {
1002 if (hiscore.scope < daddr_scope) {
1003 score.rule = 2;
1004 goto record_it;
1005 } else
1006 continue;
1007 } else if (score.scope < hiscore.scope) {
1008 if (score.scope < daddr_scope)
1009 break; /* addresses sorted by scope */
1010 else {
1011 score.rule = 2;
1012 goto record_it;
1013 }
1014 }
1015
1016 /* Rule 3: Avoid deprecated address */
1017 if (hiscore.rule < 3) {
1018 if (ipv6_saddr_preferred(hiscore.addr_type) ||
1019 !(ifa_result->flags & IFA_F_DEPRECATED))
1020 hiscore.attrs |= IPV6_SADDR_SCORE_PREFERRED;
1021 hiscore.rule++;
1022 }
1023 if (ipv6_saddr_preferred(score.addr_type) ||
1024 !(ifa->flags & IFA_F_DEPRECATED)) {
1025 score.attrs |= IPV6_SADDR_SCORE_PREFERRED;
1026 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)) {
1027 score.rule = 3;
1028 goto record_it;
1029 }
1030 } else {
1031 if (hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)
1032 continue;
1033 }
1034
1035 /* Rule 4: Prefer home address -- not implemented yet */
1036 if (hiscore.rule < 4)
1037 hiscore.rule++;
1038
1039 /* Rule 5: Prefer outgoing interface */
1040 if (hiscore.rule < 5) {
1041 if (daddr_dev == NULL ||
1042 daddr_dev == ifa_result->idev->dev)
1043 hiscore.attrs |= IPV6_SADDR_SCORE_OIF;
1044 hiscore.rule++;
1045 }
1046 if (daddr_dev == NULL ||
1047 daddr_dev == ifa->idev->dev) {
1048 score.attrs |= IPV6_SADDR_SCORE_OIF;
1049 if (!(hiscore.attrs & IPV6_SADDR_SCORE_OIF)) {
1050 score.rule = 5;
1051 goto record_it;
1052 }
1053 } else {
1054 if (hiscore.attrs & IPV6_SADDR_SCORE_OIF)
1055 continue;
1056 }
1057
1058 /* Rule 6: Prefer matching label */
1059 if (hiscore.rule < 6) {
1060 if (ipv6_saddr_label(&ifa_result->addr, hiscore.addr_type) == daddr_label)
1061 hiscore.attrs |= IPV6_SADDR_SCORE_LABEL;
1062 hiscore.rule++;
1063 }
1064 if (ipv6_saddr_label(&ifa->addr, score.addr_type) == daddr_label) {
1065 score.attrs |= IPV6_SADDR_SCORE_LABEL;
1066 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LABEL)) {
1067 score.rule = 6;
1068 goto record_it;
1069 }
1070 } else {
1071 if (hiscore.attrs & IPV6_SADDR_SCORE_LABEL)
1072 continue;
1073 }
1074
1075 #ifdef CONFIG_IPV6_PRIVACY
1076 /* Rule 7: Prefer public address
1077 * Note: prefer temprary address if use_tempaddr >= 2
1078 */
1079 if (hiscore.rule < 7) {
1080 if ((!(ifa_result->flags & IFA_F_TEMPORARY)) ^
1081 (ifa_result->idev->cnf.use_tempaddr >= 2))
1082 hiscore.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1083 hiscore.rule++;
1084 }
1085 if ((!(ifa->flags & IFA_F_TEMPORARY)) ^
1086 (ifa->idev->cnf.use_tempaddr >= 2)) {
1087 score.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1088 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)) {
1089 score.rule = 7;
1090 goto record_it;
1091 }
1092 } else {
1093 if (hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)
1094 continue;
1095 }
1096 #else
1097 if (hiscore.rule < 7)
1098 hiscore.rule++;
1099 #endif
1100 /* Rule 8: Use longest matching prefix */
1101 if (hiscore.rule < 8) {
1102 hiscore.matchlen = ipv6_addr_diff(&ifa_result->addr, daddr);
1103 hiscore.rule++;
1104 }
1105 score.matchlen = ipv6_addr_diff(&ifa->addr, daddr);
1106 if (score.matchlen > hiscore.matchlen) {
1107 score.rule = 8;
1108 goto record_it;
1109 }
1110 #if 0
1111 else if (score.matchlen < hiscore.matchlen)
1112 continue;
1113 #endif
1114
1115 /* Final Rule: choose first available one */
1116 continue;
1117 record_it:
1118 if (ifa_result)
1119 in6_ifa_put(ifa_result);
1120 in6_ifa_hold(ifa);
1121 ifa_result = ifa;
1122 hiscore = score;
1123 }
1124 read_unlock_bh(&idev->lock);
1125 }
1126 read_unlock(&addrconf_lock);
1127 read_unlock(&dev_base_lock);
1128
1129 if (!ifa_result)
1130 return -EADDRNOTAVAIL;
1131
1132 ipv6_addr_copy(saddr, &ifa_result->addr);
1133 in6_ifa_put(ifa_result);
1134 return 0;
1135 }
1136
1137
1138 int ipv6_get_saddr(struct dst_entry *dst,
1139 struct in6_addr *daddr, struct in6_addr *saddr)
1140 {
1141 return ipv6_dev_get_saddr(dst ? ((struct rt6_info *)dst)->rt6i_idev->dev : NULL, daddr, saddr);
1142 }
1143
1144
1145 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr)
1146 {
1147 struct inet6_dev *idev;
1148 int err = -EADDRNOTAVAIL;
1149
1150 read_lock(&addrconf_lock);
1151 if ((idev = __in6_dev_get(dev)) != NULL) {
1152 struct inet6_ifaddr *ifp;
1153
1154 read_lock_bh(&idev->lock);
1155 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1156 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1157 ipv6_addr_copy(addr, &ifp->addr);
1158 err = 0;
1159 break;
1160 }
1161 }
1162 read_unlock_bh(&idev->lock);
1163 }
1164 read_unlock(&addrconf_lock);
1165 return err;
1166 }
1167
1168 static int ipv6_count_addresses(struct inet6_dev *idev)
1169 {
1170 int cnt = 0;
1171 struct inet6_ifaddr *ifp;
1172
1173 read_lock_bh(&idev->lock);
1174 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1175 cnt++;
1176 read_unlock_bh(&idev->lock);
1177 return cnt;
1178 }
1179
1180 int ipv6_chk_addr(struct in6_addr *addr, struct net_device *dev, int strict)
1181 {
1182 struct inet6_ifaddr * ifp;
1183 u8 hash = ipv6_addr_hash(addr);
1184
1185 read_lock_bh(&addrconf_hash_lock);
1186 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1187 if (ipv6_addr_equal(&ifp->addr, addr) &&
1188 !(ifp->flags&IFA_F_TENTATIVE)) {
1189 if (dev == NULL || ifp->idev->dev == dev ||
1190 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1191 break;
1192 }
1193 }
1194 read_unlock_bh(&addrconf_hash_lock);
1195 return ifp != NULL;
1196 }
1197
1198 static
1199 int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev)
1200 {
1201 struct inet6_ifaddr * ifp;
1202 u8 hash = ipv6_addr_hash(addr);
1203
1204 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1205 if (ipv6_addr_equal(&ifp->addr, addr)) {
1206 if (dev == NULL || ifp->idev->dev == dev)
1207 break;
1208 }
1209 }
1210 return ifp != NULL;
1211 }
1212
1213 struct inet6_ifaddr * ipv6_get_ifaddr(struct in6_addr *addr, struct net_device *dev, int strict)
1214 {
1215 struct inet6_ifaddr * ifp;
1216 u8 hash = ipv6_addr_hash(addr);
1217
1218 read_lock_bh(&addrconf_hash_lock);
1219 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1220 if (ipv6_addr_equal(&ifp->addr, addr)) {
1221 if (dev == NULL || ifp->idev->dev == dev ||
1222 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1223 in6_ifa_hold(ifp);
1224 break;
1225 }
1226 }
1227 }
1228 read_unlock_bh(&addrconf_hash_lock);
1229
1230 return ifp;
1231 }
1232
1233 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1234 {
1235 const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
1236 const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
1237 u32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
1238 u32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1239 int sk_ipv6only = ipv6_only_sock(sk);
1240 int sk2_ipv6only = inet_v6_ipv6only(sk2);
1241 int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1242 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1243
1244 if (!sk2_rcv_saddr && !sk_ipv6only)
1245 return 1;
1246
1247 if (addr_type2 == IPV6_ADDR_ANY &&
1248 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1249 return 1;
1250
1251 if (addr_type == IPV6_ADDR_ANY &&
1252 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1253 return 1;
1254
1255 if (sk2_rcv_saddr6 &&
1256 ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1257 return 1;
1258
1259 if (addr_type == IPV6_ADDR_MAPPED &&
1260 !sk2_ipv6only &&
1261 (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1262 return 1;
1263
1264 return 0;
1265 }
1266
1267 /* Gets referenced address, destroys ifaddr */
1268
1269 static void addrconf_dad_stop(struct inet6_ifaddr *ifp)
1270 {
1271 if (ifp->flags&IFA_F_PERMANENT) {
1272 spin_lock_bh(&ifp->lock);
1273 addrconf_del_timer(ifp);
1274 ifp->flags |= IFA_F_TENTATIVE;
1275 spin_unlock_bh(&ifp->lock);
1276 in6_ifa_put(ifp);
1277 #ifdef CONFIG_IPV6_PRIVACY
1278 } else if (ifp->flags&IFA_F_TEMPORARY) {
1279 struct inet6_ifaddr *ifpub;
1280 spin_lock_bh(&ifp->lock);
1281 ifpub = ifp->ifpub;
1282 if (ifpub) {
1283 in6_ifa_hold(ifpub);
1284 spin_unlock_bh(&ifp->lock);
1285 ipv6_create_tempaddr(ifpub, ifp);
1286 in6_ifa_put(ifpub);
1287 } else {
1288 spin_unlock_bh(&ifp->lock);
1289 }
1290 ipv6_del_addr(ifp);
1291 #endif
1292 } else
1293 ipv6_del_addr(ifp);
1294 }
1295
1296 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1297 {
1298 if (net_ratelimit())
1299 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1300 addrconf_dad_stop(ifp);
1301 }
1302
1303 /* Join to solicited addr multicast group. */
1304
1305 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1306 {
1307 struct in6_addr maddr;
1308
1309 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1310 return;
1311
1312 addrconf_addr_solict_mult(addr, &maddr);
1313 ipv6_dev_mc_inc(dev, &maddr);
1314 }
1315
1316 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1317 {
1318 struct in6_addr maddr;
1319
1320 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1321 return;
1322
1323 addrconf_addr_solict_mult(addr, &maddr);
1324 __ipv6_dev_mc_dec(idev, &maddr);
1325 }
1326
1327 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1328 {
1329 struct in6_addr addr;
1330 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1331 if (ipv6_addr_any(&addr))
1332 return;
1333 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1334 }
1335
1336 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1337 {
1338 struct in6_addr addr;
1339 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1340 if (ipv6_addr_any(&addr))
1341 return;
1342 __ipv6_dev_ac_dec(ifp->idev, &addr);
1343 }
1344
1345 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1346 {
1347 if (dev->addr_len != ETH_ALEN)
1348 return -1;
1349 memcpy(eui, dev->dev_addr, 3);
1350 memcpy(eui + 5, dev->dev_addr + 3, 3);
1351
1352 /*
1353 * The zSeries OSA network cards can be shared among various
1354 * OS instances, but the OSA cards have only one MAC address.
1355 * This leads to duplicate address conflicts in conjunction
1356 * with IPv6 if more than one instance uses the same card.
1357 *
1358 * The driver for these cards can deliver a unique 16-bit
1359 * identifier for each instance sharing the same card. It is
1360 * placed instead of 0xFFFE in the interface identifier. The
1361 * "u" bit of the interface identifier is not inverted in this
1362 * case. Hence the resulting interface identifier has local
1363 * scope according to RFC2373.
1364 */
1365 if (dev->dev_id) {
1366 eui[3] = (dev->dev_id >> 8) & 0xFF;
1367 eui[4] = dev->dev_id & 0xFF;
1368 } else {
1369 eui[3] = 0xFF;
1370 eui[4] = 0xFE;
1371 eui[0] ^= 2;
1372 }
1373 return 0;
1374 }
1375
1376 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1377 {
1378 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1379 if (dev->addr_len != ARCNET_ALEN)
1380 return -1;
1381 memset(eui, 0, 7);
1382 eui[7] = *(u8*)dev->dev_addr;
1383 return 0;
1384 }
1385
1386 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1387 {
1388 if (dev->addr_len != INFINIBAND_ALEN)
1389 return -1;
1390 memcpy(eui, dev->dev_addr + 12, 8);
1391 eui[0] |= 2;
1392 return 0;
1393 }
1394
1395 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1396 {
1397 switch (dev->type) {
1398 case ARPHRD_ETHER:
1399 case ARPHRD_FDDI:
1400 case ARPHRD_IEEE802_TR:
1401 return addrconf_ifid_eui48(eui, dev);
1402 case ARPHRD_ARCNET:
1403 return addrconf_ifid_arcnet(eui, dev);
1404 case ARPHRD_INFINIBAND:
1405 return addrconf_ifid_infiniband(eui, dev);
1406 }
1407 return -1;
1408 }
1409
1410 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1411 {
1412 int err = -1;
1413 struct inet6_ifaddr *ifp;
1414
1415 read_lock_bh(&idev->lock);
1416 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1417 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1418 memcpy(eui, ifp->addr.s6_addr+8, 8);
1419 err = 0;
1420 break;
1421 }
1422 }
1423 read_unlock_bh(&idev->lock);
1424 return err;
1425 }
1426
1427 #ifdef CONFIG_IPV6_PRIVACY
1428 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1429 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1430 {
1431 regen:
1432 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1433 idev->rndid[0] &= ~0x02;
1434
1435 /*
1436 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1437 * check if generated address is not inappropriate
1438 *
1439 * - Reserved subnet anycast (RFC 2526)
1440 * 11111101 11....11 1xxxxxxx
1441 * - ISATAP (draft-ietf-ngtrans-isatap-13.txt) 5.1
1442 * 00-00-5E-FE-xx-xx-xx-xx
1443 * - value 0
1444 * - XXX: already assigned to an address on the device
1445 */
1446 if (idev->rndid[0] == 0xfd &&
1447 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1448 (idev->rndid[7]&0x80))
1449 goto regen;
1450 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1451 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1452 goto regen;
1453 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1454 goto regen;
1455 }
1456
1457 return 0;
1458 }
1459
1460 static void ipv6_regen_rndid(unsigned long data)
1461 {
1462 struct inet6_dev *idev = (struct inet6_dev *) data;
1463 unsigned long expires;
1464
1465 read_lock_bh(&addrconf_lock);
1466 write_lock_bh(&idev->lock);
1467
1468 if (idev->dead)
1469 goto out;
1470
1471 if (__ipv6_regen_rndid(idev) < 0)
1472 goto out;
1473
1474 expires = jiffies +
1475 idev->cnf.temp_prefered_lft * HZ -
1476 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1477 if (time_before(expires, jiffies)) {
1478 printk(KERN_WARNING
1479 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1480 idev->dev->name);
1481 goto out;
1482 }
1483
1484 if (!mod_timer(&idev->regen_timer, expires))
1485 in6_dev_hold(idev);
1486
1487 out:
1488 write_unlock_bh(&idev->lock);
1489 read_unlock_bh(&addrconf_lock);
1490 in6_dev_put(idev);
1491 }
1492
1493 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1494 int ret = 0;
1495
1496 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1497 ret = __ipv6_regen_rndid(idev);
1498 return ret;
1499 }
1500 #endif
1501
1502 /*
1503 * Add prefix route.
1504 */
1505
1506 static void
1507 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1508 unsigned long expires, u32 flags)
1509 {
1510 struct in6_rtmsg rtmsg;
1511
1512 memset(&rtmsg, 0, sizeof(rtmsg));
1513 ipv6_addr_copy(&rtmsg.rtmsg_dst, pfx);
1514 rtmsg.rtmsg_dst_len = plen;
1515 rtmsg.rtmsg_metric = IP6_RT_PRIO_ADDRCONF;
1516 rtmsg.rtmsg_ifindex = dev->ifindex;
1517 rtmsg.rtmsg_info = expires;
1518 rtmsg.rtmsg_flags = RTF_UP|flags;
1519 rtmsg.rtmsg_type = RTMSG_NEWROUTE;
1520
1521 /* Prevent useless cloning on PtP SIT.
1522 This thing is done here expecting that the whole
1523 class of non-broadcast devices need not cloning.
1524 */
1525 if (dev->type == ARPHRD_SIT && (dev->flags&IFF_POINTOPOINT))
1526 rtmsg.rtmsg_flags |= RTF_NONEXTHOP;
1527
1528 ip6_route_add(&rtmsg, NULL, NULL, NULL);
1529 }
1530
1531 /* Create "default" multicast route to the interface */
1532
1533 static void addrconf_add_mroute(struct net_device *dev)
1534 {
1535 struct in6_rtmsg rtmsg;
1536
1537 memset(&rtmsg, 0, sizeof(rtmsg));
1538 ipv6_addr_set(&rtmsg.rtmsg_dst,
1539 htonl(0xFF000000), 0, 0, 0);
1540 rtmsg.rtmsg_dst_len = 8;
1541 rtmsg.rtmsg_metric = IP6_RT_PRIO_ADDRCONF;
1542 rtmsg.rtmsg_ifindex = dev->ifindex;
1543 rtmsg.rtmsg_flags = RTF_UP;
1544 rtmsg.rtmsg_type = RTMSG_NEWROUTE;
1545 ip6_route_add(&rtmsg, NULL, NULL, NULL);
1546 }
1547
1548 static void sit_route_add(struct net_device *dev)
1549 {
1550 struct in6_rtmsg rtmsg;
1551
1552 memset(&rtmsg, 0, sizeof(rtmsg));
1553
1554 rtmsg.rtmsg_type = RTMSG_NEWROUTE;
1555 rtmsg.rtmsg_metric = IP6_RT_PRIO_ADDRCONF;
1556
1557 /* prefix length - 96 bits "::d.d.d.d" */
1558 rtmsg.rtmsg_dst_len = 96;
1559 rtmsg.rtmsg_flags = RTF_UP|RTF_NONEXTHOP;
1560 rtmsg.rtmsg_ifindex = dev->ifindex;
1561
1562 ip6_route_add(&rtmsg, NULL, NULL, NULL);
1563 }
1564
1565 static void addrconf_add_lroute(struct net_device *dev)
1566 {
1567 struct in6_addr addr;
1568
1569 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1570 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1571 }
1572
1573 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1574 {
1575 struct inet6_dev *idev;
1576
1577 ASSERT_RTNL();
1578
1579 if ((idev = ipv6_find_idev(dev)) == NULL)
1580 return NULL;
1581
1582 /* Add default multicast route */
1583 addrconf_add_mroute(dev);
1584
1585 /* Add link local route */
1586 addrconf_add_lroute(dev);
1587 return idev;
1588 }
1589
1590 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1591 {
1592 struct prefix_info *pinfo;
1593 __u32 valid_lft;
1594 __u32 prefered_lft;
1595 int addr_type;
1596 unsigned long rt_expires;
1597 struct inet6_dev *in6_dev;
1598
1599 pinfo = (struct prefix_info *) opt;
1600
1601 if (len < sizeof(struct prefix_info)) {
1602 ADBG(("addrconf: prefix option too short\n"));
1603 return;
1604 }
1605
1606 /*
1607 * Validation checks ([ADDRCONF], page 19)
1608 */
1609
1610 addr_type = ipv6_addr_type(&pinfo->prefix);
1611
1612 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1613 return;
1614
1615 valid_lft = ntohl(pinfo->valid);
1616 prefered_lft = ntohl(pinfo->prefered);
1617
1618 if (prefered_lft > valid_lft) {
1619 if (net_ratelimit())
1620 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1621 return;
1622 }
1623
1624 in6_dev = in6_dev_get(dev);
1625
1626 if (in6_dev == NULL) {
1627 if (net_ratelimit())
1628 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1629 return;
1630 }
1631
1632 /*
1633 * Two things going on here:
1634 * 1) Add routes for on-link prefixes
1635 * 2) Configure prefixes with the auto flag set
1636 */
1637
1638 /* Avoid arithmetic overflow. Really, we could
1639 save rt_expires in seconds, likely valid_lft,
1640 but it would require division in fib gc, that it
1641 not good.
1642 */
1643 if (valid_lft >= 0x7FFFFFFF/HZ)
1644 rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ);
1645 else
1646 rt_expires = valid_lft * HZ;
1647
1648 /*
1649 * We convert this (in jiffies) to clock_t later.
1650 * Avoid arithmetic overflow there as well.
1651 * Overflow can happen only if HZ < USER_HZ.
1652 */
1653 if (HZ < USER_HZ && rt_expires > 0x7FFFFFFF / USER_HZ)
1654 rt_expires = 0x7FFFFFFF / USER_HZ;
1655
1656 if (pinfo->onlink) {
1657 struct rt6_info *rt;
1658 rt = rt6_lookup(&pinfo->prefix, NULL, dev->ifindex, 1);
1659
1660 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
1661 if (rt->rt6i_flags&RTF_EXPIRES) {
1662 if (valid_lft == 0) {
1663 ip6_del_rt(rt, NULL, NULL, NULL);
1664 rt = NULL;
1665 } else {
1666 rt->rt6i_expires = jiffies + rt_expires;
1667 }
1668 }
1669 } else if (valid_lft) {
1670 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1671 dev, jiffies_to_clock_t(rt_expires), RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT);
1672 }
1673 if (rt)
1674 dst_release(&rt->u.dst);
1675 }
1676
1677 /* Try to figure out our local address for this prefix */
1678
1679 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1680 struct inet6_ifaddr * ifp;
1681 struct in6_addr addr;
1682 int create = 0, update_lft = 0;
1683
1684 if (pinfo->prefix_len == 64) {
1685 memcpy(&addr, &pinfo->prefix, 8);
1686 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1687 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1688 in6_dev_put(in6_dev);
1689 return;
1690 }
1691 goto ok;
1692 }
1693 if (net_ratelimit())
1694 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1695 pinfo->prefix_len);
1696 in6_dev_put(in6_dev);
1697 return;
1698
1699 ok:
1700
1701 ifp = ipv6_get_ifaddr(&addr, dev, 1);
1702
1703 if (ifp == NULL && valid_lft) {
1704 int max_addresses = in6_dev->cnf.max_addresses;
1705
1706 /* Do not allow to create too much of autoconfigured
1707 * addresses; this would be too easy way to crash kernel.
1708 */
1709 if (!max_addresses ||
1710 ipv6_count_addresses(in6_dev) < max_addresses)
1711 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1712 addr_type&IPV6_ADDR_SCOPE_MASK, 0);
1713
1714 if (!ifp || IS_ERR(ifp)) {
1715 in6_dev_put(in6_dev);
1716 return;
1717 }
1718
1719 update_lft = create = 1;
1720 ifp->cstamp = jiffies;
1721 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1722 }
1723
1724 if (ifp) {
1725 int flags;
1726 unsigned long now;
1727 #ifdef CONFIG_IPV6_PRIVACY
1728 struct inet6_ifaddr *ift;
1729 #endif
1730 u32 stored_lft;
1731
1732 /* update lifetime (RFC2462 5.5.3 e) */
1733 spin_lock(&ifp->lock);
1734 now = jiffies;
1735 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1736 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1737 else
1738 stored_lft = 0;
1739 if (!update_lft && stored_lft) {
1740 if (valid_lft > MIN_VALID_LIFETIME ||
1741 valid_lft > stored_lft)
1742 update_lft = 1;
1743 else if (stored_lft <= MIN_VALID_LIFETIME) {
1744 /* valid_lft <= stored_lft is always true */
1745 /* XXX: IPsec */
1746 update_lft = 0;
1747 } else {
1748 valid_lft = MIN_VALID_LIFETIME;
1749 if (valid_lft < prefered_lft)
1750 prefered_lft = valid_lft;
1751 update_lft = 1;
1752 }
1753 }
1754
1755 if (update_lft) {
1756 ifp->valid_lft = valid_lft;
1757 ifp->prefered_lft = prefered_lft;
1758 ifp->tstamp = now;
1759 flags = ifp->flags;
1760 ifp->flags &= ~IFA_F_DEPRECATED;
1761 spin_unlock(&ifp->lock);
1762
1763 if (!(flags&IFA_F_TENTATIVE))
1764 ipv6_ifa_notify(0, ifp);
1765 } else
1766 spin_unlock(&ifp->lock);
1767
1768 #ifdef CONFIG_IPV6_PRIVACY
1769 read_lock_bh(&in6_dev->lock);
1770 /* update all temporary addresses in the list */
1771 for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1772 /*
1773 * When adjusting the lifetimes of an existing
1774 * temporary address, only lower the lifetimes.
1775 * Implementations must not increase the
1776 * lifetimes of an existing temporary address
1777 * when processing a Prefix Information Option.
1778 */
1779 spin_lock(&ift->lock);
1780 flags = ift->flags;
1781 if (ift->valid_lft > valid_lft &&
1782 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1783 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1784 if (ift->prefered_lft > prefered_lft &&
1785 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1786 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1787 spin_unlock(&ift->lock);
1788 if (!(flags&IFA_F_TENTATIVE))
1789 ipv6_ifa_notify(0, ift);
1790 }
1791
1792 if (create && in6_dev->cnf.use_tempaddr > 0) {
1793 /*
1794 * When a new public address is created as described in [ADDRCONF],
1795 * also create a new temporary address.
1796 */
1797 read_unlock_bh(&in6_dev->lock);
1798 ipv6_create_tempaddr(ifp, NULL);
1799 } else {
1800 read_unlock_bh(&in6_dev->lock);
1801 }
1802 #endif
1803 in6_ifa_put(ifp);
1804 addrconf_verify(0);
1805 }
1806 }
1807 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
1808 in6_dev_put(in6_dev);
1809 }
1810
1811 /*
1812 * Set destination address.
1813 * Special case for SIT interfaces where we create a new "virtual"
1814 * device.
1815 */
1816 int addrconf_set_dstaddr(void __user *arg)
1817 {
1818 struct in6_ifreq ireq;
1819 struct net_device *dev;
1820 int err = -EINVAL;
1821
1822 rtnl_lock();
1823
1824 err = -EFAULT;
1825 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1826 goto err_exit;
1827
1828 dev = __dev_get_by_index(ireq.ifr6_ifindex);
1829
1830 err = -ENODEV;
1831 if (dev == NULL)
1832 goto err_exit;
1833
1834 if (dev->type == ARPHRD_SIT) {
1835 struct ifreq ifr;
1836 mm_segment_t oldfs;
1837 struct ip_tunnel_parm p;
1838
1839 err = -EADDRNOTAVAIL;
1840 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
1841 goto err_exit;
1842
1843 memset(&p, 0, sizeof(p));
1844 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
1845 p.iph.saddr = 0;
1846 p.iph.version = 4;
1847 p.iph.ihl = 5;
1848 p.iph.protocol = IPPROTO_IPV6;
1849 p.iph.ttl = 64;
1850 ifr.ifr_ifru.ifru_data = (void __user *)&p;
1851
1852 oldfs = get_fs(); set_fs(KERNEL_DS);
1853 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
1854 set_fs(oldfs);
1855
1856 if (err == 0) {
1857 err = -ENOBUFS;
1858 if ((dev = __dev_get_by_name(p.name)) == NULL)
1859 goto err_exit;
1860 err = dev_open(dev);
1861 }
1862 }
1863
1864 err_exit:
1865 rtnl_unlock();
1866 return err;
1867 }
1868
1869 /*
1870 * Manual configuration of address on an interface
1871 */
1872 static int inet6_addr_add(int ifindex, struct in6_addr *pfx, int plen)
1873 {
1874 struct inet6_ifaddr *ifp;
1875 struct inet6_dev *idev;
1876 struct net_device *dev;
1877 int scope;
1878
1879 ASSERT_RTNL();
1880
1881 if ((dev = __dev_get_by_index(ifindex)) == NULL)
1882 return -ENODEV;
1883
1884 if (!(dev->flags&IFF_UP))
1885 return -ENETDOWN;
1886
1887 if ((idev = addrconf_add_dev(dev)) == NULL)
1888 return -ENOBUFS;
1889
1890 scope = ipv6_addr_scope(pfx);
1891
1892 ifp = ipv6_add_addr(idev, pfx, plen, scope, IFA_F_PERMANENT);
1893 if (!IS_ERR(ifp)) {
1894 addrconf_dad_start(ifp, 0);
1895 in6_ifa_put(ifp);
1896 return 0;
1897 }
1898
1899 return PTR_ERR(ifp);
1900 }
1901
1902 static int inet6_addr_del(int ifindex, struct in6_addr *pfx, int plen)
1903 {
1904 struct inet6_ifaddr *ifp;
1905 struct inet6_dev *idev;
1906 struct net_device *dev;
1907
1908 if ((dev = __dev_get_by_index(ifindex)) == NULL)
1909 return -ENODEV;
1910
1911 if ((idev = __in6_dev_get(dev)) == NULL)
1912 return -ENXIO;
1913
1914 read_lock_bh(&idev->lock);
1915 for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
1916 if (ifp->prefix_len == plen &&
1917 ipv6_addr_equal(pfx, &ifp->addr)) {
1918 in6_ifa_hold(ifp);
1919 read_unlock_bh(&idev->lock);
1920
1921 ipv6_del_addr(ifp);
1922
1923 /* If the last address is deleted administratively,
1924 disable IPv6 on this interface.
1925 */
1926 if (idev->addr_list == NULL)
1927 addrconf_ifdown(idev->dev, 1);
1928 return 0;
1929 }
1930 }
1931 read_unlock_bh(&idev->lock);
1932 return -EADDRNOTAVAIL;
1933 }
1934
1935
1936 int addrconf_add_ifaddr(void __user *arg)
1937 {
1938 struct in6_ifreq ireq;
1939 int err;
1940
1941 if (!capable(CAP_NET_ADMIN))
1942 return -EPERM;
1943
1944 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1945 return -EFAULT;
1946
1947 rtnl_lock();
1948 err = inet6_addr_add(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
1949 rtnl_unlock();
1950 return err;
1951 }
1952
1953 int addrconf_del_ifaddr(void __user *arg)
1954 {
1955 struct in6_ifreq ireq;
1956 int err;
1957
1958 if (!capable(CAP_NET_ADMIN))
1959 return -EPERM;
1960
1961 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1962 return -EFAULT;
1963
1964 rtnl_lock();
1965 err = inet6_addr_del(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
1966 rtnl_unlock();
1967 return err;
1968 }
1969
1970 static void sit_add_v4_addrs(struct inet6_dev *idev)
1971 {
1972 struct inet6_ifaddr * ifp;
1973 struct in6_addr addr;
1974 struct net_device *dev;
1975 int scope;
1976
1977 ASSERT_RTNL();
1978
1979 memset(&addr, 0, sizeof(struct in6_addr));
1980 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
1981
1982 if (idev->dev->flags&IFF_POINTOPOINT) {
1983 addr.s6_addr32[0] = htonl(0xfe800000);
1984 scope = IFA_LINK;
1985 } else {
1986 scope = IPV6_ADDR_COMPATv4;
1987 }
1988
1989 if (addr.s6_addr32[3]) {
1990 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
1991 if (!IS_ERR(ifp)) {
1992 spin_lock_bh(&ifp->lock);
1993 ifp->flags &= ~IFA_F_TENTATIVE;
1994 spin_unlock_bh(&ifp->lock);
1995 ipv6_ifa_notify(RTM_NEWADDR, ifp);
1996 in6_ifa_put(ifp);
1997 }
1998 return;
1999 }
2000
2001 for (dev = dev_base; dev != NULL; dev = dev->next) {
2002 struct in_device * in_dev = __in_dev_get_rtnl(dev);
2003 if (in_dev && (dev->flags & IFF_UP)) {
2004 struct in_ifaddr * ifa;
2005
2006 int flag = scope;
2007
2008 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2009 int plen;
2010
2011 addr.s6_addr32[3] = ifa->ifa_local;
2012
2013 if (ifa->ifa_scope == RT_SCOPE_LINK)
2014 continue;
2015 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2016 if (idev->dev->flags&IFF_POINTOPOINT)
2017 continue;
2018 flag |= IFA_HOST;
2019 }
2020 if (idev->dev->flags&IFF_POINTOPOINT)
2021 plen = 64;
2022 else
2023 plen = 96;
2024
2025 ifp = ipv6_add_addr(idev, &addr, plen, flag,
2026 IFA_F_PERMANENT);
2027 if (!IS_ERR(ifp)) {
2028 spin_lock_bh(&ifp->lock);
2029 ifp->flags &= ~IFA_F_TENTATIVE;
2030 spin_unlock_bh(&ifp->lock);
2031 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2032 in6_ifa_put(ifp);
2033 }
2034 }
2035 }
2036 }
2037 }
2038
2039 static void init_loopback(struct net_device *dev)
2040 {
2041 struct inet6_dev *idev;
2042 struct inet6_ifaddr * ifp;
2043
2044 /* ::1 */
2045
2046 ASSERT_RTNL();
2047
2048 if ((idev = ipv6_find_idev(dev)) == NULL) {
2049 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2050 return;
2051 }
2052
2053 ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
2054 if (!IS_ERR(ifp)) {
2055 spin_lock_bh(&ifp->lock);
2056 ifp->flags &= ~IFA_F_TENTATIVE;
2057 spin_unlock_bh(&ifp->lock);
2058 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2059 in6_ifa_put(ifp);
2060 }
2061 }
2062
2063 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2064 {
2065 struct inet6_ifaddr * ifp;
2066
2067 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, IFA_F_PERMANENT);
2068 if (!IS_ERR(ifp)) {
2069 addrconf_dad_start(ifp, 0);
2070 in6_ifa_put(ifp);
2071 }
2072 }
2073
2074 static void addrconf_dev_config(struct net_device *dev)
2075 {
2076 struct in6_addr addr;
2077 struct inet6_dev * idev;
2078
2079 ASSERT_RTNL();
2080
2081 if ((dev->type != ARPHRD_ETHER) &&
2082 (dev->type != ARPHRD_FDDI) &&
2083 (dev->type != ARPHRD_IEEE802_TR) &&
2084 (dev->type != ARPHRD_ARCNET) &&
2085 (dev->type != ARPHRD_INFINIBAND)) {
2086 /* Alas, we support only Ethernet autoconfiguration. */
2087 return;
2088 }
2089
2090 idev = addrconf_add_dev(dev);
2091 if (idev == NULL)
2092 return;
2093
2094 memset(&addr, 0, sizeof(struct in6_addr));
2095 addr.s6_addr32[0] = htonl(0xFE800000);
2096
2097 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2098 addrconf_add_linklocal(idev, &addr);
2099 }
2100
2101 static void addrconf_sit_config(struct net_device *dev)
2102 {
2103 struct inet6_dev *idev;
2104
2105 ASSERT_RTNL();
2106
2107 /*
2108 * Configure the tunnel with one of our IPv4
2109 * addresses... we should configure all of
2110 * our v4 addrs in the tunnel
2111 */
2112
2113 if ((idev = ipv6_find_idev(dev)) == NULL) {
2114 printk(KERN_DEBUG "init sit: add_dev failed\n");
2115 return;
2116 }
2117
2118 sit_add_v4_addrs(idev);
2119
2120 if (dev->flags&IFF_POINTOPOINT) {
2121 addrconf_add_mroute(dev);
2122 addrconf_add_lroute(dev);
2123 } else
2124 sit_route_add(dev);
2125 }
2126
2127 static inline int
2128 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2129 {
2130 struct in6_addr lladdr;
2131
2132 if (!ipv6_get_lladdr(link_dev, &lladdr)) {
2133 addrconf_add_linklocal(idev, &lladdr);
2134 return 0;
2135 }
2136 return -1;
2137 }
2138
2139 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2140 {
2141 struct net_device *link_dev;
2142
2143 /* first try to inherit the link-local address from the link device */
2144 if (idev->dev->iflink &&
2145 (link_dev = __dev_get_by_index(idev->dev->iflink))) {
2146 if (!ipv6_inherit_linklocal(idev, link_dev))
2147 return;
2148 }
2149 /* then try to inherit it from any device */
2150 for (link_dev = dev_base; link_dev; link_dev = link_dev->next) {
2151 if (!ipv6_inherit_linklocal(idev, link_dev))
2152 return;
2153 }
2154 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2155 }
2156
2157 /*
2158 * Autoconfigure tunnel with a link-local address so routing protocols,
2159 * DHCPv6, MLD etc. can be run over the virtual link
2160 */
2161
2162 static void addrconf_ip6_tnl_config(struct net_device *dev)
2163 {
2164 struct inet6_dev *idev;
2165
2166 ASSERT_RTNL();
2167
2168 if ((idev = addrconf_add_dev(dev)) == NULL) {
2169 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2170 return;
2171 }
2172 ip6_tnl_add_linklocal(idev);
2173 }
2174
2175 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2176 void * data)
2177 {
2178 struct net_device *dev = (struct net_device *) data;
2179 struct inet6_dev *idev = __in6_dev_get(dev);
2180 int run_pending = 0;
2181
2182 switch(event) {
2183 case NETDEV_UP:
2184 case NETDEV_CHANGE:
2185 if (event == NETDEV_UP) {
2186 if (!netif_carrier_ok(dev)) {
2187 /* device is not ready yet. */
2188 printk(KERN_INFO
2189 "ADDRCONF(NETDEV_UP): %s: "
2190 "link is not ready\n",
2191 dev->name);
2192 break;
2193 }
2194
2195 if (idev)
2196 idev->if_flags |= IF_READY;
2197 } else {
2198 if (!netif_carrier_ok(dev)) {
2199 /* device is still not ready. */
2200 break;
2201 }
2202
2203 if (idev) {
2204 if (idev->if_flags & IF_READY) {
2205 /* device is already configured. */
2206 break;
2207 }
2208 idev->if_flags |= IF_READY;
2209 }
2210
2211 printk(KERN_INFO
2212 "ADDRCONF(NETDEV_CHANGE): %s: "
2213 "link becomes ready\n",
2214 dev->name);
2215
2216 run_pending = 1;
2217 }
2218
2219 switch(dev->type) {
2220 case ARPHRD_SIT:
2221 addrconf_sit_config(dev);
2222 break;
2223 case ARPHRD_TUNNEL6:
2224 addrconf_ip6_tnl_config(dev);
2225 break;
2226 case ARPHRD_LOOPBACK:
2227 init_loopback(dev);
2228 break;
2229
2230 default:
2231 addrconf_dev_config(dev);
2232 break;
2233 };
2234 if (idev) {
2235 if (run_pending)
2236 addrconf_dad_run(idev);
2237
2238 /* If the MTU changed during the interface down, when the
2239 interface up, the changed MTU must be reflected in the
2240 idev as well as routers.
2241 */
2242 if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2243 rt6_mtu_change(dev, dev->mtu);
2244 idev->cnf.mtu6 = dev->mtu;
2245 }
2246 idev->tstamp = jiffies;
2247 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2248 /* If the changed mtu during down is lower than IPV6_MIN_MTU
2249 stop IPv6 on this interface.
2250 */
2251 if (dev->mtu < IPV6_MIN_MTU)
2252 addrconf_ifdown(dev, event != NETDEV_DOWN);
2253 }
2254 break;
2255
2256 case NETDEV_CHANGEMTU:
2257 if ( idev && dev->mtu >= IPV6_MIN_MTU) {
2258 rt6_mtu_change(dev, dev->mtu);
2259 idev->cnf.mtu6 = dev->mtu;
2260 break;
2261 }
2262
2263 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2264
2265 case NETDEV_DOWN:
2266 case NETDEV_UNREGISTER:
2267 /*
2268 * Remove all addresses from this interface.
2269 */
2270 addrconf_ifdown(dev, event != NETDEV_DOWN);
2271 break;
2272
2273 case NETDEV_CHANGENAME:
2274 #ifdef CONFIG_SYSCTL
2275 if (idev) {
2276 addrconf_sysctl_unregister(&idev->cnf);
2277 neigh_sysctl_unregister(idev->nd_parms);
2278 neigh_sysctl_register(dev, idev->nd_parms,
2279 NET_IPV6, NET_IPV6_NEIGH, "ipv6",
2280 &ndisc_ifinfo_sysctl_change,
2281 NULL);
2282 addrconf_sysctl_register(idev, &idev->cnf);
2283 }
2284 #endif
2285 break;
2286 };
2287
2288 return NOTIFY_OK;
2289 }
2290
2291 /*
2292 * addrconf module should be notified of a device going up
2293 */
2294 static struct notifier_block ipv6_dev_notf = {
2295 .notifier_call = addrconf_notify,
2296 .priority = 0
2297 };
2298
2299 static int addrconf_ifdown(struct net_device *dev, int how)
2300 {
2301 struct inet6_dev *idev;
2302 struct inet6_ifaddr *ifa, **bifa;
2303 int i;
2304
2305 ASSERT_RTNL();
2306
2307 if (dev == &loopback_dev && how == 1)
2308 how = 0;
2309
2310 rt6_ifdown(dev);
2311 neigh_ifdown(&nd_tbl, dev);
2312
2313 idev = __in6_dev_get(dev);
2314 if (idev == NULL)
2315 return -ENODEV;
2316
2317 /* Step 1: remove reference to ipv6 device from parent device.
2318 Do not dev_put!
2319 */
2320 if (how == 1) {
2321 write_lock_bh(&addrconf_lock);
2322 dev->ip6_ptr = NULL;
2323 idev->dead = 1;
2324 write_unlock_bh(&addrconf_lock);
2325
2326 /* Step 1.5: remove snmp6 entry */
2327 snmp6_unregister_dev(idev);
2328
2329 }
2330
2331 /* Step 2: clear hash table */
2332 for (i=0; i<IN6_ADDR_HSIZE; i++) {
2333 bifa = &inet6_addr_lst[i];
2334
2335 write_lock_bh(&addrconf_hash_lock);
2336 while ((ifa = *bifa) != NULL) {
2337 if (ifa->idev == idev) {
2338 *bifa = ifa->lst_next;
2339 ifa->lst_next = NULL;
2340 addrconf_del_timer(ifa);
2341 in6_ifa_put(ifa);
2342 continue;
2343 }
2344 bifa = &ifa->lst_next;
2345 }
2346 write_unlock_bh(&addrconf_hash_lock);
2347 }
2348
2349 write_lock_bh(&idev->lock);
2350
2351 /* Step 3: clear flags for stateless addrconf */
2352 if (how != 1)
2353 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2354
2355 /* Step 4: clear address list */
2356 #ifdef CONFIG_IPV6_PRIVACY
2357 if (how == 1 && del_timer(&idev->regen_timer))
2358 in6_dev_put(idev);
2359
2360 /* clear tempaddr list */
2361 while ((ifa = idev->tempaddr_list) != NULL) {
2362 idev->tempaddr_list = ifa->tmp_next;
2363 ifa->tmp_next = NULL;
2364 ifa->dead = 1;
2365 write_unlock_bh(&idev->lock);
2366 spin_lock_bh(&ifa->lock);
2367
2368 if (ifa->ifpub) {
2369 in6_ifa_put(ifa->ifpub);
2370 ifa->ifpub = NULL;
2371 }
2372 spin_unlock_bh(&ifa->lock);
2373 in6_ifa_put(ifa);
2374 write_lock_bh(&idev->lock);
2375 }
2376 #endif
2377 while ((ifa = idev->addr_list) != NULL) {
2378 idev->addr_list = ifa->if_next;
2379 ifa->if_next = NULL;
2380 ifa->dead = 1;
2381 addrconf_del_timer(ifa);
2382 write_unlock_bh(&idev->lock);
2383
2384 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2385 in6_ifa_put(ifa);
2386
2387 write_lock_bh(&idev->lock);
2388 }
2389 write_unlock_bh(&idev->lock);
2390
2391 /* Step 5: Discard multicast list */
2392
2393 if (how == 1)
2394 ipv6_mc_destroy_dev(idev);
2395 else
2396 ipv6_mc_down(idev);
2397
2398 /* Step 5: netlink notification of this interface */
2399 idev->tstamp = jiffies;
2400 inet6_ifinfo_notify(RTM_DELLINK, idev);
2401
2402 /* Shot the device (if unregistered) */
2403
2404 if (how == 1) {
2405 #ifdef CONFIG_SYSCTL
2406 addrconf_sysctl_unregister(&idev->cnf);
2407 neigh_sysctl_unregister(idev->nd_parms);
2408 #endif
2409 neigh_parms_release(&nd_tbl, idev->nd_parms);
2410 neigh_ifdown(&nd_tbl, dev);
2411 in6_dev_put(idev);
2412 }
2413 return 0;
2414 }
2415
2416 static void addrconf_rs_timer(unsigned long data)
2417 {
2418 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2419
2420 if (ifp->idev->cnf.forwarding)
2421 goto out;
2422
2423 if (ifp->idev->if_flags & IF_RA_RCVD) {
2424 /*
2425 * Announcement received after solicitation
2426 * was sent
2427 */
2428 goto out;
2429 }
2430
2431 spin_lock(&ifp->lock);
2432 if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2433 struct in6_addr all_routers;
2434
2435 /* The wait after the last probe can be shorter */
2436 addrconf_mod_timer(ifp, AC_RS,
2437 (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2438 ifp->idev->cnf.rtr_solicit_delay :
2439 ifp->idev->cnf.rtr_solicit_interval);
2440 spin_unlock(&ifp->lock);
2441
2442 ipv6_addr_all_routers(&all_routers);
2443
2444 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2445 } else {
2446 spin_unlock(&ifp->lock);
2447 /*
2448 * Note: we do not support deprecated "all on-link"
2449 * assumption any longer.
2450 */
2451 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2452 ifp->idev->dev->name);
2453 }
2454
2455 out:
2456 in6_ifa_put(ifp);
2457 }
2458
2459 /*
2460 * Duplicate Address Detection
2461 */
2462 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2463 {
2464 unsigned long rand_num;
2465 struct inet6_dev *idev = ifp->idev;
2466
2467 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2468 ifp->probes = idev->cnf.dad_transmits;
2469 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2470 }
2471
2472 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2473 {
2474 struct inet6_dev *idev = ifp->idev;
2475 struct net_device *dev = idev->dev;
2476
2477 addrconf_join_solict(dev, &ifp->addr);
2478
2479 if (ifp->prefix_len != 128 && (ifp->flags&IFA_F_PERMANENT))
2480 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 0,
2481 flags);
2482
2483 net_srandom(ifp->addr.s6_addr32[3]);
2484
2485 read_lock_bh(&idev->lock);
2486 if (ifp->dead)
2487 goto out;
2488 spin_lock_bh(&ifp->lock);
2489
2490 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2491 !(ifp->flags&IFA_F_TENTATIVE)) {
2492 ifp->flags &= ~IFA_F_TENTATIVE;
2493 spin_unlock_bh(&ifp->lock);
2494 read_unlock_bh(&idev->lock);
2495
2496 addrconf_dad_completed(ifp);
2497 return;
2498 }
2499
2500 if (!(idev->if_flags & IF_READY)) {
2501 spin_unlock_bh(&ifp->lock);
2502 read_unlock_bh(&idev->lock);
2503 /*
2504 * If the defice is not ready:
2505 * - keep it tentative if it is a permanent address.
2506 * - otherwise, kill it.
2507 */
2508 in6_ifa_hold(ifp);
2509 addrconf_dad_stop(ifp);
2510 return;
2511 }
2512 addrconf_dad_kick(ifp);
2513 spin_unlock_bh(&ifp->lock);
2514 out:
2515 read_unlock_bh(&idev->lock);
2516 }
2517
2518 static void addrconf_dad_timer(unsigned long data)
2519 {
2520 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2521 struct inet6_dev *idev = ifp->idev;
2522 struct in6_addr unspec;
2523 struct in6_addr mcaddr;
2524
2525 read_lock_bh(&idev->lock);
2526 if (idev->dead) {
2527 read_unlock_bh(&idev->lock);
2528 goto out;
2529 }
2530 spin_lock_bh(&ifp->lock);
2531 if (ifp->probes == 0) {
2532 /*
2533 * DAD was successful
2534 */
2535
2536 ifp->flags &= ~IFA_F_TENTATIVE;
2537 spin_unlock_bh(&ifp->lock);
2538 read_unlock_bh(&idev->lock);
2539
2540 addrconf_dad_completed(ifp);
2541
2542 goto out;
2543 }
2544
2545 ifp->probes--;
2546 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2547 spin_unlock_bh(&ifp->lock);
2548 read_unlock_bh(&idev->lock);
2549
2550 /* send a neighbour solicitation for our addr */
2551 memset(&unspec, 0, sizeof(unspec));
2552 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2553 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec);
2554 out:
2555 in6_ifa_put(ifp);
2556 }
2557
2558 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2559 {
2560 struct net_device * dev = ifp->idev->dev;
2561
2562 /*
2563 * Configure the address for reception. Now it is valid.
2564 */
2565
2566 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2567
2568 /* If added prefix is link local and forwarding is off,
2569 start sending router solicitations.
2570 */
2571
2572 if (ifp->idev->cnf.forwarding == 0 &&
2573 ifp->idev->cnf.rtr_solicits > 0 &&
2574 (dev->flags&IFF_LOOPBACK) == 0 &&
2575 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2576 struct in6_addr all_routers;
2577
2578 ipv6_addr_all_routers(&all_routers);
2579
2580 /*
2581 * If a host as already performed a random delay
2582 * [...] as part of DAD [...] there is no need
2583 * to delay again before sending the first RS
2584 */
2585 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2586
2587 spin_lock_bh(&ifp->lock);
2588 ifp->probes = 1;
2589 ifp->idev->if_flags |= IF_RS_SENT;
2590 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2591 spin_unlock_bh(&ifp->lock);
2592 }
2593 }
2594
2595 static void addrconf_dad_run(struct inet6_dev *idev) {
2596 struct inet6_ifaddr *ifp;
2597
2598 read_lock_bh(&idev->lock);
2599 for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2600 spin_lock_bh(&ifp->lock);
2601 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2602 spin_unlock_bh(&ifp->lock);
2603 continue;
2604 }
2605 spin_unlock_bh(&ifp->lock);
2606 addrconf_dad_kick(ifp);
2607 }
2608 read_unlock_bh(&idev->lock);
2609 }
2610
2611 #ifdef CONFIG_PROC_FS
2612 struct if6_iter_state {
2613 int bucket;
2614 };
2615
2616 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2617 {
2618 struct inet6_ifaddr *ifa = NULL;
2619 struct if6_iter_state *state = seq->private;
2620
2621 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2622 ifa = inet6_addr_lst[state->bucket];
2623 if (ifa)
2624 break;
2625 }
2626 return ifa;
2627 }
2628
2629 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2630 {
2631 struct if6_iter_state *state = seq->private;
2632
2633 ifa = ifa->lst_next;
2634 try_again:
2635 if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2636 ifa = inet6_addr_lst[state->bucket];
2637 goto try_again;
2638 }
2639 return ifa;
2640 }
2641
2642 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2643 {
2644 struct inet6_ifaddr *ifa = if6_get_first(seq);
2645
2646 if (ifa)
2647 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2648 --pos;
2649 return pos ? NULL : ifa;
2650 }
2651
2652 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2653 {
2654 read_lock_bh(&addrconf_hash_lock);
2655 return if6_get_idx(seq, *pos);
2656 }
2657
2658 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2659 {
2660 struct inet6_ifaddr *ifa;
2661
2662 ifa = if6_get_next(seq, v);
2663 ++*pos;
2664 return ifa;
2665 }
2666
2667 static void if6_seq_stop(struct seq_file *seq, void *v)
2668 {
2669 read_unlock_bh(&addrconf_hash_lock);
2670 }
2671
2672 static int if6_seq_show(struct seq_file *seq, void *v)
2673 {
2674 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2675 seq_printf(seq,
2676 NIP6_SEQFMT " %02x %02x %02x %02x %8s\n",
2677 NIP6(ifp->addr),
2678 ifp->idev->dev->ifindex,
2679 ifp->prefix_len,
2680 ifp->scope,
2681 ifp->flags,
2682 ifp->idev->dev->name);
2683 return 0;
2684 }
2685
2686 static struct seq_operations if6_seq_ops = {
2687 .start = if6_seq_start,
2688 .next = if6_seq_next,
2689 .show = if6_seq_show,
2690 .stop = if6_seq_stop,
2691 };
2692
2693 static int if6_seq_open(struct inode *inode, struct file *file)
2694 {
2695 struct seq_file *seq;
2696 int rc = -ENOMEM;
2697 struct if6_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL);
2698
2699 if (!s)
2700 goto out;
2701
2702 rc = seq_open(file, &if6_seq_ops);
2703 if (rc)
2704 goto out_kfree;
2705
2706 seq = file->private_data;
2707 seq->private = s;
2708 out:
2709 return rc;
2710 out_kfree:
2711 kfree(s);
2712 goto out;
2713 }
2714
2715 static struct file_operations if6_fops = {
2716 .owner = THIS_MODULE,
2717 .open = if6_seq_open,
2718 .read = seq_read,
2719 .llseek = seq_lseek,
2720 .release = seq_release_private,
2721 };
2722
2723 int __init if6_proc_init(void)
2724 {
2725 if (!proc_net_fops_create("if_inet6", S_IRUGO, &if6_fops))
2726 return -ENOMEM;
2727 return 0;
2728 }
2729
2730 void if6_proc_exit(void)
2731 {
2732 proc_net_remove("if_inet6");
2733 }
2734 #endif /* CONFIG_PROC_FS */
2735
2736 /*
2737 * Periodic address status verification
2738 */
2739
2740 static void addrconf_verify(unsigned long foo)
2741 {
2742 struct inet6_ifaddr *ifp;
2743 unsigned long now, next;
2744 int i;
2745
2746 spin_lock_bh(&addrconf_verify_lock);
2747 now = jiffies;
2748 next = now + ADDR_CHECK_FREQUENCY;
2749
2750 del_timer(&addr_chk_timer);
2751
2752 for (i=0; i < IN6_ADDR_HSIZE; i++) {
2753
2754 restart:
2755 read_lock(&addrconf_hash_lock);
2756 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
2757 unsigned long age;
2758 #ifdef CONFIG_IPV6_PRIVACY
2759 unsigned long regen_advance;
2760 #endif
2761
2762 if (ifp->flags & IFA_F_PERMANENT)
2763 continue;
2764
2765 spin_lock(&ifp->lock);
2766 age = (now - ifp->tstamp) / HZ;
2767
2768 #ifdef CONFIG_IPV6_PRIVACY
2769 regen_advance = ifp->idev->cnf.regen_max_retry *
2770 ifp->idev->cnf.dad_transmits *
2771 ifp->idev->nd_parms->retrans_time / HZ;
2772 #endif
2773
2774 if (age >= ifp->valid_lft) {
2775 spin_unlock(&ifp->lock);
2776 in6_ifa_hold(ifp);
2777 read_unlock(&addrconf_hash_lock);
2778 ipv6_del_addr(ifp);
2779 goto restart;
2780 } else if (age >= ifp->prefered_lft) {
2781 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
2782 int deprecate = 0;
2783
2784 if (!(ifp->flags&IFA_F_DEPRECATED)) {
2785 deprecate = 1;
2786 ifp->flags |= IFA_F_DEPRECATED;
2787 }
2788
2789 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
2790 next = ifp->tstamp + ifp->valid_lft * HZ;
2791
2792 spin_unlock(&ifp->lock);
2793
2794 if (deprecate) {
2795 in6_ifa_hold(ifp);
2796 read_unlock(&addrconf_hash_lock);
2797
2798 ipv6_ifa_notify(0, ifp);
2799 in6_ifa_put(ifp);
2800 goto restart;
2801 }
2802 #ifdef CONFIG_IPV6_PRIVACY
2803 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
2804 !(ifp->flags&IFA_F_TENTATIVE)) {
2805 if (age >= ifp->prefered_lft - regen_advance) {
2806 struct inet6_ifaddr *ifpub = ifp->ifpub;
2807 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2808 next = ifp->tstamp + ifp->prefered_lft * HZ;
2809 if (!ifp->regen_count && ifpub) {
2810 ifp->regen_count++;
2811 in6_ifa_hold(ifp);
2812 in6_ifa_hold(ifpub);
2813 spin_unlock(&ifp->lock);
2814 read_unlock(&addrconf_hash_lock);
2815 spin_lock(&ifpub->lock);
2816 ifpub->regen_count = 0;
2817 spin_unlock(&ifpub->lock);
2818 ipv6_create_tempaddr(ifpub, ifp);
2819 in6_ifa_put(ifpub);
2820 in6_ifa_put(ifp);
2821 goto restart;
2822 }
2823 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
2824 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
2825 spin_unlock(&ifp->lock);
2826 #endif
2827 } else {
2828 /* ifp->prefered_lft <= ifp->valid_lft */
2829 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2830 next = ifp->tstamp + ifp->prefered_lft * HZ;
2831 spin_unlock(&ifp->lock);
2832 }
2833 }
2834 read_unlock(&addrconf_hash_lock);
2835 }
2836
2837 addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
2838 add_timer(&addr_chk_timer);
2839 spin_unlock_bh(&addrconf_verify_lock);
2840 }
2841
2842 static int
2843 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
2844 {
2845 struct rtattr **rta = arg;
2846 struct ifaddrmsg *ifm = NLMSG_DATA(nlh);
2847 struct in6_addr *pfx;
2848
2849 pfx = NULL;
2850 if (rta[IFA_ADDRESS-1]) {
2851 if (RTA_PAYLOAD(rta[IFA_ADDRESS-1]) < sizeof(*pfx))
2852 return -EINVAL;
2853 pfx = RTA_DATA(rta[IFA_ADDRESS-1]);
2854 }
2855 if (rta[IFA_LOCAL-1]) {
2856 if (pfx && memcmp(pfx, RTA_DATA(rta[IFA_LOCAL-1]), sizeof(*pfx)))
2857 return -EINVAL;
2858 pfx = RTA_DATA(rta[IFA_LOCAL-1]);
2859 }
2860 if (pfx == NULL)
2861 return -EINVAL;
2862
2863 return inet6_addr_del(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
2864 }
2865
2866 static int
2867 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
2868 {
2869 struct rtattr **rta = arg;
2870 struct ifaddrmsg *ifm = NLMSG_DATA(nlh);
2871 struct in6_addr *pfx;
2872
2873 pfx = NULL;
2874 if (rta[IFA_ADDRESS-1]) {
2875 if (RTA_PAYLOAD(rta[IFA_ADDRESS-1]) < sizeof(*pfx))
2876 return -EINVAL;
2877 pfx = RTA_DATA(rta[IFA_ADDRESS-1]);
2878 }
2879 if (rta[IFA_LOCAL-1]) {
2880 if (pfx && memcmp(pfx, RTA_DATA(rta[IFA_LOCAL-1]), sizeof(*pfx)))
2881 return -EINVAL;
2882 pfx = RTA_DATA(rta[IFA_LOCAL-1]);
2883 }
2884 if (pfx == NULL)
2885 return -EINVAL;
2886
2887 return inet6_addr_add(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
2888 }
2889
2890 /* Maximum length of ifa_cacheinfo attributes */
2891 #define INET6_IFADDR_RTA_SPACE \
2892 RTA_SPACE(16) /* IFA_ADDRESS */ + \
2893 RTA_SPACE(sizeof(struct ifa_cacheinfo)) /* CACHEINFO */
2894
2895 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
2896 u32 pid, u32 seq, int event, unsigned int flags)
2897 {
2898 struct ifaddrmsg *ifm;
2899 struct nlmsghdr *nlh;
2900 struct ifa_cacheinfo ci;
2901 unsigned char *b = skb->tail;
2902
2903 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags);
2904 ifm = NLMSG_DATA(nlh);
2905 ifm->ifa_family = AF_INET6;
2906 ifm->ifa_prefixlen = ifa->prefix_len;
2907 ifm->ifa_flags = ifa->flags;
2908 ifm->ifa_scope = RT_SCOPE_UNIVERSE;
2909 if (ifa->scope&IFA_HOST)
2910 ifm->ifa_scope = RT_SCOPE_HOST;
2911 else if (ifa->scope&IFA_LINK)
2912 ifm->ifa_scope = RT_SCOPE_LINK;
2913 else if (ifa->scope&IFA_SITE)
2914 ifm->ifa_scope = RT_SCOPE_SITE;
2915 ifm->ifa_index = ifa->idev->dev->ifindex;
2916 RTA_PUT(skb, IFA_ADDRESS, 16, &ifa->addr);
2917 if (!(ifa->flags&IFA_F_PERMANENT)) {
2918 ci.ifa_prefered = ifa->prefered_lft;
2919 ci.ifa_valid = ifa->valid_lft;
2920 if (ci.ifa_prefered != INFINITY_LIFE_TIME) {
2921 long tval = (jiffies - ifa->tstamp)/HZ;
2922 ci.ifa_prefered -= tval;
2923 if (ci.ifa_valid != INFINITY_LIFE_TIME)
2924 ci.ifa_valid -= tval;
2925 }
2926 } else {
2927 ci.ifa_prefered = INFINITY_LIFE_TIME;
2928 ci.ifa_valid = INFINITY_LIFE_TIME;
2929 }
2930 ci.cstamp = (__u32)(TIME_DELTA(ifa->cstamp, INITIAL_JIFFIES) / HZ * 100
2931 + TIME_DELTA(ifa->cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
2932 ci.tstamp = (__u32)(TIME_DELTA(ifa->tstamp, INITIAL_JIFFIES) / HZ * 100
2933 + TIME_DELTA(ifa->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
2934 RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci);
2935 nlh->nlmsg_len = skb->tail - b;
2936 return skb->len;
2937
2938 nlmsg_failure:
2939 rtattr_failure:
2940 skb_trim(skb, b - skb->data);
2941 return -1;
2942 }
2943
2944 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
2945 u32 pid, u32 seq, int event, u16 flags)
2946 {
2947 struct ifaddrmsg *ifm;
2948 struct nlmsghdr *nlh;
2949 struct ifa_cacheinfo ci;
2950 unsigned char *b = skb->tail;
2951
2952 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags);
2953 ifm = NLMSG_DATA(nlh);
2954 ifm->ifa_family = AF_INET6;
2955 ifm->ifa_prefixlen = 128;
2956 ifm->ifa_flags = IFA_F_PERMANENT;
2957 ifm->ifa_scope = RT_SCOPE_UNIVERSE;
2958 if (ipv6_addr_scope(&ifmca->mca_addr)&IFA_SITE)
2959 ifm->ifa_scope = RT_SCOPE_SITE;
2960 ifm->ifa_index = ifmca->idev->dev->ifindex;
2961 RTA_PUT(skb, IFA_MULTICAST, 16, &ifmca->mca_addr);
2962 ci.cstamp = (__u32)(TIME_DELTA(ifmca->mca_cstamp, INITIAL_JIFFIES) / HZ
2963 * 100 + TIME_DELTA(ifmca->mca_cstamp, INITIAL_JIFFIES) % HZ
2964 * 100 / HZ);
2965 ci.tstamp = (__u32)(TIME_DELTA(ifmca->mca_tstamp, INITIAL_JIFFIES) / HZ
2966 * 100 + TIME_DELTA(ifmca->mca_tstamp, INITIAL_JIFFIES) % HZ
2967 * 100 / HZ);
2968 ci.ifa_prefered = INFINITY_LIFE_TIME;
2969 ci.ifa_valid = INFINITY_LIFE_TIME;
2970 RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci);
2971 nlh->nlmsg_len = skb->tail - b;
2972 return skb->len;
2973
2974 nlmsg_failure:
2975 rtattr_failure:
2976 skb_trim(skb, b - skb->data);
2977 return -1;
2978 }
2979
2980 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
2981 u32 pid, u32 seq, int event, unsigned int flags)
2982 {
2983 struct ifaddrmsg *ifm;
2984 struct nlmsghdr *nlh;
2985 struct ifa_cacheinfo ci;
2986 unsigned char *b = skb->tail;
2987
2988 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags);
2989 ifm = NLMSG_DATA(nlh);
2990 ifm->ifa_family = AF_INET6;
2991 ifm->ifa_prefixlen = 128;
2992 ifm->ifa_flags = IFA_F_PERMANENT;
2993 ifm->ifa_scope = RT_SCOPE_UNIVERSE;
2994 if (ipv6_addr_scope(&ifaca->aca_addr)&IFA_SITE)
2995 ifm->ifa_scope = RT_SCOPE_SITE;
2996 ifm->ifa_index = ifaca->aca_idev->dev->ifindex;
2997 RTA_PUT(skb, IFA_ANYCAST, 16, &ifaca->aca_addr);
2998 ci.cstamp = (__u32)(TIME_DELTA(ifaca->aca_cstamp, INITIAL_JIFFIES) / HZ
2999 * 100 + TIME_DELTA(ifaca->aca_cstamp, INITIAL_JIFFIES) % HZ
3000 * 100 / HZ);
3001 ci.tstamp = (__u32)(TIME_DELTA(ifaca->aca_tstamp, INITIAL_JIFFIES) / HZ
3002 * 100 + TIME_DELTA(ifaca->aca_tstamp, INITIAL_JIFFIES) % HZ
3003 * 100 / HZ);
3004 ci.ifa_prefered = INFINITY_LIFE_TIME;
3005 ci.ifa_valid = INFINITY_LIFE_TIME;
3006 RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3007 nlh->nlmsg_len = skb->tail - b;
3008 return skb->len;
3009
3010 nlmsg_failure:
3011 rtattr_failure:
3012 skb_trim(skb, b - skb->data);
3013 return -1;
3014 }
3015
3016 enum addr_type_t
3017 {
3018 UNICAST_ADDR,
3019 MULTICAST_ADDR,
3020 ANYCAST_ADDR,
3021 };
3022
3023 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3024 enum addr_type_t type)
3025 {
3026 int idx, ip_idx;
3027 int s_idx, s_ip_idx;
3028 int err = 1;
3029 struct net_device *dev;
3030 struct inet6_dev *idev = NULL;
3031 struct inet6_ifaddr *ifa;
3032 struct ifmcaddr6 *ifmca;
3033 struct ifacaddr6 *ifaca;
3034
3035 s_idx = cb->args[0];
3036 s_ip_idx = ip_idx = cb->args[1];
3037 read_lock(&dev_base_lock);
3038
3039 for (dev = dev_base, idx = 0; dev; dev = dev->next, idx++) {
3040 if (idx < s_idx)
3041 continue;
3042 if (idx > s_idx)
3043 s_ip_idx = 0;
3044 ip_idx = 0;
3045 if ((idev = in6_dev_get(dev)) == NULL)
3046 continue;
3047 read_lock_bh(&idev->lock);
3048 switch (type) {
3049 case UNICAST_ADDR:
3050 /* unicast address incl. temp addr */
3051 for (ifa = idev->addr_list; ifa;
3052 ifa = ifa->if_next, ip_idx++) {
3053 if (ip_idx < s_ip_idx)
3054 continue;
3055 if ((err = inet6_fill_ifaddr(skb, ifa,
3056 NETLINK_CB(cb->skb).pid,
3057 cb->nlh->nlmsg_seq, RTM_NEWADDR,
3058 NLM_F_MULTI)) <= 0)
3059 goto done;
3060 }
3061 break;
3062 case MULTICAST_ADDR:
3063 /* multicast address */
3064 for (ifmca = idev->mc_list; ifmca;
3065 ifmca = ifmca->next, ip_idx++) {
3066 if (ip_idx < s_ip_idx)
3067 continue;
3068 if ((err = inet6_fill_ifmcaddr(skb, ifmca,
3069 NETLINK_CB(cb->skb).pid,
3070 cb->nlh->nlmsg_seq, RTM_GETMULTICAST,
3071 NLM_F_MULTI)) <= 0)
3072 goto done;
3073 }
3074 break;
3075 case ANYCAST_ADDR:
3076 /* anycast address */
3077 for (ifaca = idev->ac_list; ifaca;
3078 ifaca = ifaca->aca_next, ip_idx++) {
3079 if (ip_idx < s_ip_idx)
3080 continue;
3081 if ((err = inet6_fill_ifacaddr(skb, ifaca,
3082 NETLINK_CB(cb->skb).pid,
3083 cb->nlh->nlmsg_seq, RTM_GETANYCAST,
3084 NLM_F_MULTI)) <= 0)
3085 goto done;
3086 }
3087 break;
3088 default:
3089 break;
3090 }
3091 read_unlock_bh(&idev->lock);
3092 in6_dev_put(idev);
3093 }
3094 done:
3095 if (err <= 0) {
3096 read_unlock_bh(&idev->lock);
3097 in6_dev_put(idev);
3098 }
3099 read_unlock(&dev_base_lock);
3100 cb->args[0] = idx;
3101 cb->args[1] = ip_idx;
3102 return skb->len;
3103 }
3104
3105 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3106 {
3107 enum addr_type_t type = UNICAST_ADDR;
3108 return inet6_dump_addr(skb, cb, type);
3109 }
3110
3111 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3112 {
3113 enum addr_type_t type = MULTICAST_ADDR;
3114 return inet6_dump_addr(skb, cb, type);
3115 }
3116
3117
3118 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3119 {
3120 enum addr_type_t type = ANYCAST_ADDR;
3121 return inet6_dump_addr(skb, cb, type);
3122 }
3123
3124 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3125 {
3126 struct sk_buff *skb;
3127 int size = NLMSG_SPACE(sizeof(struct ifaddrmsg) + INET6_IFADDR_RTA_SPACE);
3128
3129 skb = alloc_skb(size, GFP_ATOMIC);
3130 if (!skb) {
3131 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFADDR, ENOBUFS);
3132 return;
3133 }
3134 if (inet6_fill_ifaddr(skb, ifa, current->pid, 0, event, 0) < 0) {
3135 kfree_skb(skb);
3136 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFADDR, EINVAL);
3137 return;
3138 }
3139 NETLINK_CB(skb).dst_group = RTNLGRP_IPV6_IFADDR;
3140 netlink_broadcast(rtnl, skb, 0, RTNLGRP_IPV6_IFADDR, GFP_ATOMIC);
3141 }
3142
3143 static void inline ipv6_store_devconf(struct ipv6_devconf *cnf,
3144 __s32 *array, int bytes)
3145 {
3146 memset(array, 0, bytes);
3147 array[DEVCONF_FORWARDING] = cnf->forwarding;
3148 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3149 array[DEVCONF_MTU6] = cnf->mtu6;
3150 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3151 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3152 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3153 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3154 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3155 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3156 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3157 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3158 #ifdef CONFIG_IPV6_PRIVACY
3159 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3160 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3161 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3162 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3163 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3164 #endif
3165 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3166 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3167 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3168 #ifdef CONFIG_IPV6_ROUTER_PREF
3169 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3170 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
3171 #ifdef CONFIV_IPV6_ROUTE_INFO
3172 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3173 #endif
3174 #endif
3175 }
3176
3177 /* Maximum length of ifinfomsg attributes */
3178 #define INET6_IFINFO_RTA_SPACE \
3179 RTA_SPACE(IFNAMSIZ) /* IFNAME */ + \
3180 RTA_SPACE(MAX_ADDR_LEN) /* ADDRESS */ + \
3181 RTA_SPACE(sizeof(u32)) /* MTU */ + \
3182 RTA_SPACE(sizeof(int)) /* LINK */ + \
3183 RTA_SPACE(0) /* PROTINFO */ + \
3184 RTA_SPACE(sizeof(u32)) /* FLAGS */ + \
3185 RTA_SPACE(sizeof(struct ifla_cacheinfo)) /* CACHEINFO */ + \
3186 RTA_SPACE(sizeof(__s32[DEVCONF_MAX])) /* CONF */
3187
3188 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3189 u32 pid, u32 seq, int event, unsigned int flags)
3190 {
3191 struct net_device *dev = idev->dev;
3192 __s32 *array = NULL;
3193 struct ifinfomsg *r;
3194 struct nlmsghdr *nlh;
3195 unsigned char *b = skb->tail;
3196 struct rtattr *subattr;
3197 __u32 mtu = dev->mtu;
3198 struct ifla_cacheinfo ci;
3199
3200 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*r), flags);
3201 r = NLMSG_DATA(nlh);
3202 r->ifi_family = AF_INET6;
3203 r->__ifi_pad = 0;
3204 r->ifi_type = dev->type;
3205 r->ifi_index = dev->ifindex;
3206 r->ifi_flags = dev_get_flags(dev);
3207 r->ifi_change = 0;
3208
3209 RTA_PUT(skb, IFLA_IFNAME, strlen(dev->name)+1, dev->name);
3210
3211 if (dev->addr_len)
3212 RTA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3213
3214 RTA_PUT(skb, IFLA_MTU, sizeof(mtu), &mtu);
3215 if (dev->ifindex != dev->iflink)
3216 RTA_PUT(skb, IFLA_LINK, sizeof(int), &dev->iflink);
3217
3218 subattr = (struct rtattr*)skb->tail;
3219
3220 RTA_PUT(skb, IFLA_PROTINFO, 0, NULL);
3221
3222 /* return the device flags */
3223 RTA_PUT(skb, IFLA_INET6_FLAGS, sizeof(__u32), &idev->if_flags);
3224
3225 /* return interface cacheinfo */
3226 ci.max_reasm_len = IPV6_MAXPLEN;
3227 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3228 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3229 ci.reachable_time = idev->nd_parms->reachable_time;
3230 ci.retrans_time = idev->nd_parms->retrans_time;
3231 RTA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3232
3233 /* return the device sysctl params */
3234 if ((array = kmalloc(DEVCONF_MAX * sizeof(*array), GFP_ATOMIC)) == NULL)
3235 goto rtattr_failure;
3236 ipv6_store_devconf(&idev->cnf, array, DEVCONF_MAX * sizeof(*array));
3237 RTA_PUT(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(*array), array);
3238
3239 /* XXX - Statistics/MC not implemented */
3240 subattr->rta_len = skb->tail - (u8*)subattr;
3241
3242 nlh->nlmsg_len = skb->tail - b;
3243 kfree(array);
3244 return skb->len;
3245
3246 nlmsg_failure:
3247 rtattr_failure:
3248 kfree(array);
3249 skb_trim(skb, b - skb->data);
3250 return -1;
3251 }
3252
3253 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3254 {
3255 int idx, err;
3256 int s_idx = cb->args[0];
3257 struct net_device *dev;
3258 struct inet6_dev *idev;
3259
3260 read_lock(&dev_base_lock);
3261 for (dev=dev_base, idx=0; dev; dev = dev->next, idx++) {
3262 if (idx < s_idx)
3263 continue;
3264 if ((idev = in6_dev_get(dev)) == NULL)
3265 continue;
3266 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
3267 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
3268 in6_dev_put(idev);
3269 if (err <= 0)
3270 break;
3271 }
3272 read_unlock(&dev_base_lock);
3273 cb->args[0] = idx;
3274
3275 return skb->len;
3276 }
3277
3278 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3279 {
3280 struct sk_buff *skb;
3281 int size = NLMSG_SPACE(sizeof(struct ifinfomsg) + INET6_IFINFO_RTA_SPACE);
3282
3283 skb = alloc_skb(size, GFP_ATOMIC);
3284 if (!skb) {
3285 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFINFO, ENOBUFS);
3286 return;
3287 }
3288 if (inet6_fill_ifinfo(skb, idev, current->pid, 0, event, 0) < 0) {
3289 kfree_skb(skb);
3290 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFINFO, EINVAL);
3291 return;
3292 }
3293 NETLINK_CB(skb).dst_group = RTNLGRP_IPV6_IFINFO;
3294 netlink_broadcast(rtnl, skb, 0, RTNLGRP_IPV6_IFINFO, GFP_ATOMIC);
3295 }
3296
3297 /* Maximum length of prefix_cacheinfo attributes */
3298 #define INET6_PREFIX_RTA_SPACE \
3299 RTA_SPACE(sizeof(((struct prefix_info *)NULL)->prefix)) /* ADDRESS */ + \
3300 RTA_SPACE(sizeof(struct prefix_cacheinfo)) /* CACHEINFO */
3301
3302 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
3303 struct prefix_info *pinfo, u32 pid, u32 seq,
3304 int event, unsigned int flags)
3305 {
3306 struct prefixmsg *pmsg;
3307 struct nlmsghdr *nlh;
3308 unsigned char *b = skb->tail;
3309 struct prefix_cacheinfo ci;
3310
3311 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*pmsg), flags);
3312 pmsg = NLMSG_DATA(nlh);
3313 pmsg->prefix_family = AF_INET6;
3314 pmsg->prefix_pad1 = 0;
3315 pmsg->prefix_pad2 = 0;
3316 pmsg->prefix_ifindex = idev->dev->ifindex;
3317 pmsg->prefix_len = pinfo->prefix_len;
3318 pmsg->prefix_type = pinfo->type;
3319 pmsg->prefix_pad3 = 0;
3320
3321 pmsg->prefix_flags = 0;
3322 if (pinfo->onlink)
3323 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3324 if (pinfo->autoconf)
3325 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3326
3327 RTA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
3328
3329 ci.preferred_time = ntohl(pinfo->prefered);
3330 ci.valid_time = ntohl(pinfo->valid);
3331 RTA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
3332
3333 nlh->nlmsg_len = skb->tail - b;
3334 return skb->len;
3335
3336 nlmsg_failure:
3337 rtattr_failure:
3338 skb_trim(skb, b - skb->data);
3339 return -1;
3340 }
3341
3342 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
3343 struct prefix_info *pinfo)
3344 {
3345 struct sk_buff *skb;
3346 int size = NLMSG_SPACE(sizeof(struct prefixmsg) + INET6_PREFIX_RTA_SPACE);
3347
3348 skb = alloc_skb(size, GFP_ATOMIC);
3349 if (!skb) {
3350 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_PREFIX, ENOBUFS);
3351 return;
3352 }
3353 if (inet6_fill_prefix(skb, idev, pinfo, current->pid, 0, event, 0) < 0) {
3354 kfree_skb(skb);
3355 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_PREFIX, EINVAL);
3356 return;
3357 }
3358 NETLINK_CB(skb).dst_group = RTNLGRP_IPV6_PREFIX;
3359 netlink_broadcast(rtnl, skb, 0, RTNLGRP_IPV6_PREFIX, GFP_ATOMIC);
3360 }
3361
3362 static struct rtnetlink_link inet6_rtnetlink_table[RTM_NR_MSGTYPES] = {
3363 [RTM_GETLINK - RTM_BASE] = { .dumpit = inet6_dump_ifinfo, },
3364 [RTM_NEWADDR - RTM_BASE] = { .doit = inet6_rtm_newaddr, },
3365 [RTM_DELADDR - RTM_BASE] = { .doit = inet6_rtm_deladdr, },
3366 [RTM_GETADDR - RTM_BASE] = { .dumpit = inet6_dump_ifaddr, },
3367 [RTM_GETMULTICAST - RTM_BASE] = { .dumpit = inet6_dump_ifmcaddr, },
3368 [RTM_GETANYCAST - RTM_BASE] = { .dumpit = inet6_dump_ifacaddr, },
3369 [RTM_NEWROUTE - RTM_BASE] = { .doit = inet6_rtm_newroute, },
3370 [RTM_DELROUTE - RTM_BASE] = { .doit = inet6_rtm_delroute, },
3371 [RTM_GETROUTE - RTM_BASE] = { .doit = inet6_rtm_getroute,
3372 .dumpit = inet6_dump_fib, },
3373 };
3374
3375 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3376 {
3377 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3378
3379 switch (event) {
3380 case RTM_NEWADDR:
3381 ip6_ins_rt(ifp->rt, NULL, NULL, NULL);
3382 if (ifp->idev->cnf.forwarding)
3383 addrconf_join_anycast(ifp);
3384 break;
3385 case RTM_DELADDR:
3386 if (ifp->idev->cnf.forwarding)
3387 addrconf_leave_anycast(ifp);
3388 addrconf_leave_solict(ifp->idev, &ifp->addr);
3389 dst_hold(&ifp->rt->u.dst);
3390 if (ip6_del_rt(ifp->rt, NULL, NULL, NULL))
3391 dst_free(&ifp->rt->u.dst);
3392 break;
3393 }
3394 }
3395
3396 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3397 {
3398 read_lock_bh(&addrconf_lock);
3399 if (likely(ifp->idev->dead == 0))
3400 __ipv6_ifa_notify(event, ifp);
3401 read_unlock_bh(&addrconf_lock);
3402 }
3403
3404 #ifdef CONFIG_SYSCTL
3405
3406 static
3407 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3408 void __user *buffer, size_t *lenp, loff_t *ppos)
3409 {
3410 int *valp = ctl->data;
3411 int val = *valp;
3412 int ret;
3413
3414 ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3415
3416 if (write && valp != &ipv6_devconf_dflt.forwarding) {
3417 if (valp != &ipv6_devconf.forwarding) {
3418 if ((!*valp) ^ (!val)) {
3419 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
3420 if (idev == NULL)
3421 return ret;
3422 dev_forward_change(idev);
3423 }
3424 } else {
3425 ipv6_devconf_dflt.forwarding = ipv6_devconf.forwarding;
3426 addrconf_forward_change();
3427 }
3428 if (*valp)
3429 rt6_purge_dflt_routers();
3430 }
3431
3432 return ret;
3433 }
3434
3435 static int addrconf_sysctl_forward_strategy(ctl_table *table,
3436 int __user *name, int nlen,
3437 void __user *oldval,
3438 size_t __user *oldlenp,
3439 void __user *newval, size_t newlen,
3440 void **context)
3441 {
3442 int *valp = table->data;
3443 int new;
3444
3445 if (!newval || !newlen)
3446 return 0;
3447 if (newlen != sizeof(int))
3448 return -EINVAL;
3449 if (get_user(new, (int __user *)newval))
3450 return -EFAULT;
3451 if (new == *valp)
3452 return 0;
3453 if (oldval && oldlenp) {
3454 size_t len;
3455 if (get_user(len, oldlenp))
3456 return -EFAULT;
3457 if (len) {
3458 if (len > table->maxlen)
3459 len = table->maxlen;
3460 if (copy_to_user(oldval, valp, len))
3461 return -EFAULT;
3462 if (put_user(len, oldlenp))
3463 return -EFAULT;
3464 }
3465 }
3466
3467 if (valp != &ipv6_devconf_dflt.forwarding) {
3468 if (valp != &ipv6_devconf.forwarding) {
3469 struct inet6_dev *idev = (struct inet6_dev *)table->extra1;
3470 int changed;
3471 if (unlikely(idev == NULL))
3472 return -ENODEV;
3473 changed = (!*valp) ^ (!new);
3474 *valp = new;
3475 if (changed)
3476 dev_forward_change(idev);
3477 } else {
3478 *valp = new;
3479 addrconf_forward_change();
3480 }
3481
3482 if (*valp)
3483 rt6_purge_dflt_routers();
3484 } else
3485 *valp = new;
3486
3487 return 1;
3488 }
3489
3490 static struct addrconf_sysctl_table
3491 {
3492 struct ctl_table_header *sysctl_header;
3493 ctl_table addrconf_vars[__NET_IPV6_MAX];
3494 ctl_table addrconf_dev[2];
3495 ctl_table addrconf_conf_dir[2];
3496 ctl_table addrconf_proto_dir[2];
3497 ctl_table addrconf_root_dir[2];
3498 } addrconf_sysctl = {
3499 .sysctl_header = NULL,
3500 .addrconf_vars = {
3501 {
3502 .ctl_name = NET_IPV6_FORWARDING,
3503 .procname = "forwarding",
3504 .data = &ipv6_devconf.forwarding,
3505 .maxlen = sizeof(int),
3506 .mode = 0644,
3507 .proc_handler = &addrconf_sysctl_forward,
3508 .strategy = &addrconf_sysctl_forward_strategy,
3509 },
3510 {
3511 .ctl_name = NET_IPV6_HOP_LIMIT,
3512 .procname = "hop_limit",
3513 .data = &ipv6_devconf.hop_limit,
3514 .maxlen = sizeof(int),
3515 .mode = 0644,
3516 .proc_handler = proc_dointvec,
3517 },
3518 {
3519 .ctl_name = NET_IPV6_MTU,
3520 .procname = "mtu",
3521 .data = &ipv6_devconf.mtu6,
3522 .maxlen = sizeof(int),
3523 .mode = 0644,
3524 .proc_handler = &proc_dointvec,
3525 },
3526 {
3527 .ctl_name = NET_IPV6_ACCEPT_RA,
3528 .procname = "accept_ra",
3529 .data = &ipv6_devconf.accept_ra,
3530 .maxlen = sizeof(int),
3531 .mode = 0644,
3532 .proc_handler = &proc_dointvec,
3533 },
3534 {
3535 .ctl_name = NET_IPV6_ACCEPT_REDIRECTS,
3536 .procname = "accept_redirects",
3537 .data = &ipv6_devconf.accept_redirects,
3538 .maxlen = sizeof(int),
3539 .mode = 0644,
3540 .proc_handler = &proc_dointvec,
3541 },
3542 {
3543 .ctl_name = NET_IPV6_AUTOCONF,
3544 .procname = "autoconf",
3545 .data = &ipv6_devconf.autoconf,
3546 .maxlen = sizeof(int),
3547 .mode = 0644,
3548 .proc_handler = &proc_dointvec,
3549 },
3550 {
3551 .ctl_name = NET_IPV6_DAD_TRANSMITS,
3552 .procname = "dad_transmits",
3553 .data = &ipv6_devconf.dad_transmits,
3554 .maxlen = sizeof(int),
3555 .mode = 0644,
3556 .proc_handler = &proc_dointvec,
3557 },
3558 {
3559 .ctl_name = NET_IPV6_RTR_SOLICITS,
3560 .procname = "router_solicitations",
3561 .data = &ipv6_devconf.rtr_solicits,
3562 .maxlen = sizeof(int),
3563 .mode = 0644,
3564 .proc_handler = &proc_dointvec,
3565 },
3566 {
3567 .ctl_name = NET_IPV6_RTR_SOLICIT_INTERVAL,
3568 .procname = "router_solicitation_interval",
3569 .data = &ipv6_devconf.rtr_solicit_interval,
3570 .maxlen = sizeof(int),
3571 .mode = 0644,
3572 .proc_handler = &proc_dointvec_jiffies,
3573 .strategy = &sysctl_jiffies,
3574 },
3575 {
3576 .ctl_name = NET_IPV6_RTR_SOLICIT_DELAY,
3577 .procname = "router_solicitation_delay",
3578 .data = &ipv6_devconf.rtr_solicit_delay,
3579 .maxlen = sizeof(int),
3580 .mode = 0644,
3581 .proc_handler = &proc_dointvec_jiffies,
3582 .strategy = &sysctl_jiffies,
3583 },
3584 {
3585 .ctl_name = NET_IPV6_FORCE_MLD_VERSION,
3586 .procname = "force_mld_version",
3587 .data = &ipv6_devconf.force_mld_version,
3588 .maxlen = sizeof(int),
3589 .mode = 0644,
3590 .proc_handler = &proc_dointvec,
3591 },
3592 #ifdef CONFIG_IPV6_PRIVACY
3593 {
3594 .ctl_name = NET_IPV6_USE_TEMPADDR,
3595 .procname = "use_tempaddr",
3596 .data = &ipv6_devconf.use_tempaddr,
3597 .maxlen = sizeof(int),
3598 .mode = 0644,
3599 .proc_handler = &proc_dointvec,
3600 },
3601 {
3602 .ctl_name = NET_IPV6_TEMP_VALID_LFT,
3603 .procname = "temp_valid_lft",
3604 .data = &ipv6_devconf.temp_valid_lft,
3605 .maxlen = sizeof(int),
3606 .mode = 0644,
3607 .proc_handler = &proc_dointvec,
3608 },
3609 {
3610 .ctl_name = NET_IPV6_TEMP_PREFERED_LFT,
3611 .procname = "temp_prefered_lft",
3612 .data = &ipv6_devconf.temp_prefered_lft,
3613 .maxlen = sizeof(int),
3614 .mode = 0644,
3615 .proc_handler = &proc_dointvec,
3616 },
3617 {
3618 .ctl_name = NET_IPV6_REGEN_MAX_RETRY,
3619 .procname = "regen_max_retry",
3620 .data = &ipv6_devconf.regen_max_retry,
3621 .maxlen = sizeof(int),
3622 .mode = 0644,
3623 .proc_handler = &proc_dointvec,
3624 },
3625 {
3626 .ctl_name = NET_IPV6_MAX_DESYNC_FACTOR,
3627 .procname = "max_desync_factor",
3628 .data = &ipv6_devconf.max_desync_factor,
3629 .maxlen = sizeof(int),
3630 .mode = 0644,
3631 .proc_handler = &proc_dointvec,
3632 },
3633 #endif
3634 {
3635 .ctl_name = NET_IPV6_MAX_ADDRESSES,
3636 .procname = "max_addresses",
3637 .data = &ipv6_devconf.max_addresses,
3638 .maxlen = sizeof(int),
3639 .mode = 0644,
3640 .proc_handler = &proc_dointvec,
3641 },
3642 {
3643 .ctl_name = NET_IPV6_ACCEPT_RA_DEFRTR,
3644 .procname = "accept_ra_defrtr",
3645 .data = &ipv6_devconf.accept_ra_defrtr,
3646 .maxlen = sizeof(int),
3647 .mode = 0644,
3648 .proc_handler = &proc_dointvec,
3649 },
3650 {
3651 .ctl_name = NET_IPV6_ACCEPT_RA_PINFO,
3652 .procname = "accept_ra_pinfo",
3653 .data = &ipv6_devconf.accept_ra_pinfo,
3654 .maxlen = sizeof(int),
3655 .mode = 0644,
3656 .proc_handler = &proc_dointvec,
3657 },
3658 #ifdef CONFIG_IPV6_ROUTER_PREF
3659 {
3660 .ctl_name = NET_IPV6_ACCEPT_RA_RTR_PREF,
3661 .procname = "accept_ra_rtr_pref",
3662 .data = &ipv6_devconf.accept_ra_rtr_pref,
3663 .maxlen = sizeof(int),
3664 .mode = 0644,
3665 .proc_handler = &proc_dointvec,
3666 },
3667 {
3668 .ctl_name = NET_IPV6_RTR_PROBE_INTERVAL,
3669 .procname = "router_probe_interval",
3670 .data = &ipv6_devconf.rtr_probe_interval,
3671 .maxlen = sizeof(int),
3672 .mode = 0644,
3673 .proc_handler = &proc_dointvec_jiffies,
3674 .strategy = &sysctl_jiffies,
3675 },
3676 #ifdef CONFIV_IPV6_ROUTE_INFO
3677 {
3678 .ctl_name = NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN,
3679 .procname = "accept_ra_rt_info_max_plen",
3680 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
3681 .maxlen = sizeof(int),
3682 .mode = 0644,
3683 .proc_handler = &proc_dointvec,
3684 },
3685 #endif
3686 #endif
3687 {
3688 .ctl_name = 0, /* sentinel */
3689 }
3690 },
3691 .addrconf_dev = {
3692 {
3693 .ctl_name = NET_PROTO_CONF_ALL,
3694 .procname = "all",
3695 .mode = 0555,
3696 .child = addrconf_sysctl.addrconf_vars,
3697 },
3698 {
3699 .ctl_name = 0, /* sentinel */
3700 }
3701 },
3702 .addrconf_conf_dir = {
3703 {
3704 .ctl_name = NET_IPV6_CONF,
3705 .procname = "conf",
3706 .mode = 0555,
3707 .child = addrconf_sysctl.addrconf_dev,
3708 },
3709 {
3710 .ctl_name = 0, /* sentinel */
3711 }
3712 },
3713 .addrconf_proto_dir = {
3714 {
3715 .ctl_name = NET_IPV6,
3716 .procname = "ipv6",
3717 .mode = 0555,
3718 .child = addrconf_sysctl.addrconf_conf_dir,
3719 },
3720 {
3721 .ctl_name = 0, /* sentinel */
3722 }
3723 },
3724 .addrconf_root_dir = {
3725 {
3726 .ctl_name = CTL_NET,
3727 .procname = "net",
3728 .mode = 0555,
3729 .child = addrconf_sysctl.addrconf_proto_dir,
3730 },
3731 {
3732 .ctl_name = 0, /* sentinel */
3733 }
3734 },
3735 };
3736
3737 static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p)
3738 {
3739 int i;
3740 struct net_device *dev = idev ? idev->dev : NULL;
3741 struct addrconf_sysctl_table *t;
3742 char *dev_name = NULL;
3743
3744 t = kmalloc(sizeof(*t), GFP_KERNEL);
3745 if (t == NULL)
3746 return;
3747 memcpy(t, &addrconf_sysctl, sizeof(*t));
3748 for (i=0; t->addrconf_vars[i].data; i++) {
3749 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
3750 t->addrconf_vars[i].de = NULL;
3751 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
3752 }
3753 if (dev) {
3754 dev_name = dev->name;
3755 t->addrconf_dev[0].ctl_name = dev->ifindex;
3756 } else {
3757 dev_name = "default";
3758 t->addrconf_dev[0].ctl_name = NET_PROTO_CONF_DEFAULT;
3759 }
3760
3761 /*
3762 * Make a copy of dev_name, because '.procname' is regarded as const
3763 * by sysctl and we wouldn't want anyone to change it under our feet
3764 * (see SIOCSIFNAME).
3765 */
3766 dev_name = kstrdup(dev_name, GFP_KERNEL);
3767 if (!dev_name)
3768 goto free;
3769
3770 t->addrconf_dev[0].procname = dev_name;
3771
3772 t->addrconf_dev[0].child = t->addrconf_vars;
3773 t->addrconf_dev[0].de = NULL;
3774 t->addrconf_conf_dir[0].child = t->addrconf_dev;
3775 t->addrconf_conf_dir[0].de = NULL;
3776 t->addrconf_proto_dir[0].child = t->addrconf_conf_dir;
3777 t->addrconf_proto_dir[0].de = NULL;
3778 t->addrconf_root_dir[0].child = t->addrconf_proto_dir;
3779 t->addrconf_root_dir[0].de = NULL;
3780
3781 t->sysctl_header = register_sysctl_table(t->addrconf_root_dir, 0);
3782 if (t->sysctl_header == NULL)
3783 goto free_procname;
3784 else
3785 p->sysctl = t;
3786 return;
3787
3788 /* error path */
3789 free_procname:
3790 kfree(dev_name);
3791 free:
3792 kfree(t);
3793
3794 return;
3795 }
3796
3797 static void addrconf_sysctl_unregister(struct ipv6_devconf *p)
3798 {
3799 if (p->sysctl) {
3800 struct addrconf_sysctl_table *t = p->sysctl;
3801 p->sysctl = NULL;
3802 unregister_sysctl_table(t->sysctl_header);
3803 kfree(t->addrconf_dev[0].procname);
3804 kfree(t);
3805 }
3806 }
3807
3808
3809 #endif
3810
3811 /*
3812 * Device notifier
3813 */
3814
3815 int register_inet6addr_notifier(struct notifier_block *nb)
3816 {
3817 return atomic_notifier_chain_register(&inet6addr_chain, nb);
3818 }
3819
3820 int unregister_inet6addr_notifier(struct notifier_block *nb)
3821 {
3822 return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
3823 }
3824
3825 /*
3826 * Init / cleanup code
3827 */
3828
3829 int __init addrconf_init(void)
3830 {
3831 int err = 0;
3832
3833 /* The addrconf netdev notifier requires that loopback_dev
3834 * has it's ipv6 private information allocated and setup
3835 * before it can bring up and give link-local addresses
3836 * to other devices which are up.
3837 *
3838 * Unfortunately, loopback_dev is not necessarily the first
3839 * entry in the global dev_base list of net devices. In fact,
3840 * it is likely to be the very last entry on that list.
3841 * So this causes the notifier registry below to try and
3842 * give link-local addresses to all devices besides loopback_dev
3843 * first, then loopback_dev, which cases all the non-loopback_dev
3844 * devices to fail to get a link-local address.
3845 *
3846 * So, as a temporary fix, allocate the ipv6 structure for
3847 * loopback_dev first by hand.
3848 * Longer term, all of the dependencies ipv6 has upon the loopback
3849 * device and it being up should be removed.
3850 */
3851 rtnl_lock();
3852 if (!ipv6_add_dev(&loopback_dev))
3853 err = -ENOMEM;
3854 rtnl_unlock();
3855 if (err)
3856 return err;
3857
3858 ip6_null_entry.rt6i_idev = in6_dev_get(&loopback_dev);
3859
3860 register_netdevice_notifier(&ipv6_dev_notf);
3861
3862 addrconf_verify(0);
3863 rtnetlink_links[PF_INET6] = inet6_rtnetlink_table;
3864 #ifdef CONFIG_SYSCTL
3865 addrconf_sysctl.sysctl_header =
3866 register_sysctl_table(addrconf_sysctl.addrconf_root_dir, 0);
3867 addrconf_sysctl_register(NULL, &ipv6_devconf_dflt);
3868 #endif
3869
3870 return 0;
3871 }
3872
3873 void __exit addrconf_cleanup(void)
3874 {
3875 struct net_device *dev;
3876 struct inet6_dev *idev;
3877 struct inet6_ifaddr *ifa;
3878 int i;
3879
3880 unregister_netdevice_notifier(&ipv6_dev_notf);
3881
3882 rtnetlink_links[PF_INET6] = NULL;
3883 #ifdef CONFIG_SYSCTL
3884 addrconf_sysctl_unregister(&ipv6_devconf_dflt);
3885 addrconf_sysctl_unregister(&ipv6_devconf);
3886 #endif
3887
3888 rtnl_lock();
3889
3890 /*
3891 * clean dev list.
3892 */
3893
3894 for (dev=dev_base; dev; dev=dev->next) {
3895 if ((idev = __in6_dev_get(dev)) == NULL)
3896 continue;
3897 addrconf_ifdown(dev, 1);
3898 }
3899 addrconf_ifdown(&loopback_dev, 2);
3900
3901 /*
3902 * Check hash table.
3903 */
3904
3905 write_lock_bh(&addrconf_hash_lock);
3906 for (i=0; i < IN6_ADDR_HSIZE; i++) {
3907 for (ifa=inet6_addr_lst[i]; ifa; ) {
3908 struct inet6_ifaddr *bifa;
3909
3910 bifa = ifa;
3911 ifa = ifa->lst_next;
3912 printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
3913 /* Do not free it; something is wrong.
3914 Now we can investigate it with debugger.
3915 */
3916 }
3917 }
3918 write_unlock_bh(&addrconf_hash_lock);
3919
3920 del_timer(&addr_chk_timer);
3921
3922 rtnl_unlock();
3923
3924 #ifdef CONFIG_PROC_FS
3925 proc_net_remove("if_inet6");
3926 #endif
3927 }
Linux kernel - Deliverables
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