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[IPv6]: Use rtnl registration interface
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / ipv6 / addrconf.c
blobeecba1886b497c872a4fc8f69a75efc948bb865a
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/net.h>
48 #include <linux/in6.h>
49 #include <linux/netdevice.h>
50 #include <linux/if_addr.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 <net/netlink.h>
76 #include <linux/if_tunnel.h>
77 #include <linux/rtnetlink.h>
78
79 #ifdef CONFIG_IPV6_PRIVACY
80 #include <linux/random.h>
81 #endif
82
83 #include <asm/uaccess.h>
84
85 #include <linux/proc_fs.h>
86 #include <linux/seq_file.h>
87
88 /* Set to 3 to get tracing... */
89 #define ACONF_DEBUG 2
90
91 #if ACONF_DEBUG >= 3
92 #define ADBG(x) printk x
93 #else
94 #define ADBG(x)
95 #endif
96
97 #define INFINITY_LIFE_TIME 0xFFFFFFFF
98 #define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b)))
99
100 #ifdef CONFIG_SYSCTL
101 static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p);
102 static void addrconf_sysctl_unregister(struct ipv6_devconf *p);
103 #endif
104
105 #ifdef CONFIG_IPV6_PRIVACY
106 static int __ipv6_regen_rndid(struct inet6_dev *idev);
107 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
108 static void ipv6_regen_rndid(unsigned long data);
109
110 static int desync_factor = MAX_DESYNC_FACTOR * HZ;
111 #endif
112
113 static int ipv6_count_addresses(struct inet6_dev *idev);
114
115 /*
116 * Configured unicast address hash table
117 */
118 static struct inet6_ifaddr *inet6_addr_lst[IN6_ADDR_HSIZE];
119 static DEFINE_RWLOCK(addrconf_hash_lock);
120
121 static void addrconf_verify(unsigned long);
122
123 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
124 static DEFINE_SPINLOCK(addrconf_verify_lock);
125
126 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
127 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
128
129 static int addrconf_ifdown(struct net_device *dev, int how);
130
131 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
132 static void addrconf_dad_timer(unsigned long data);
133 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
134 static void addrconf_dad_run(struct inet6_dev *idev);
135 static void addrconf_rs_timer(unsigned long data);
136 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
137 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
138
139 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
140 struct prefix_info *pinfo);
141 static int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev);
142
143 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
144
145 struct ipv6_devconf ipv6_devconf __read_mostly = {
146 .forwarding = 0,
147 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
148 .mtu6 = IPV6_MIN_MTU,
149 .accept_ra = 1,
150 .accept_redirects = 1,
151 .autoconf = 1,
152 .force_mld_version = 0,
153 .dad_transmits = 1,
154 .rtr_solicits = MAX_RTR_SOLICITATIONS,
155 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
156 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
157 #ifdef CONFIG_IPV6_PRIVACY
158 .use_tempaddr = 0,
159 .temp_valid_lft = TEMP_VALID_LIFETIME,
160 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
161 .regen_max_retry = REGEN_MAX_RETRY,
162 .max_desync_factor = MAX_DESYNC_FACTOR,
163 #endif
164 .max_addresses = IPV6_MAX_ADDRESSES,
165 .accept_ra_defrtr = 1,
166 .accept_ra_pinfo = 1,
167 #ifdef CONFIG_IPV6_ROUTER_PREF
168 .accept_ra_rtr_pref = 1,
169 .rtr_probe_interval = 60 * HZ,
170 #ifdef CONFIG_IPV6_ROUTE_INFO
171 .accept_ra_rt_info_max_plen = 0,
172 #endif
173 #endif
174 .proxy_ndp = 0,
175 .accept_source_route = 0, /* we do not accept RH0 by default. */
176 };
177
178 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
179 .forwarding = 0,
180 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
181 .mtu6 = IPV6_MIN_MTU,
182 .accept_ra = 1,
183 .accept_redirects = 1,
184 .autoconf = 1,
185 .dad_transmits = 1,
186 .rtr_solicits = MAX_RTR_SOLICITATIONS,
187 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
188 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
189 #ifdef CONFIG_IPV6_PRIVACY
190 .use_tempaddr = 0,
191 .temp_valid_lft = TEMP_VALID_LIFETIME,
192 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
193 .regen_max_retry = REGEN_MAX_RETRY,
194 .max_desync_factor = MAX_DESYNC_FACTOR,
195 #endif
196 .max_addresses = IPV6_MAX_ADDRESSES,
197 .accept_ra_defrtr = 1,
198 .accept_ra_pinfo = 1,
199 #ifdef CONFIG_IPV6_ROUTER_PREF
200 .accept_ra_rtr_pref = 1,
201 .rtr_probe_interval = 60 * HZ,
202 #ifdef CONFIG_IPV6_ROUTE_INFO
203 .accept_ra_rt_info_max_plen = 0,
204 #endif
205 #endif
206 .proxy_ndp = 0,
207 .accept_source_route = 0, /* we do not accept RH0 by default. */
208 };
209
210 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
211 #if 0
212 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
213 #endif
214 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
215
216 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
217 {
218 if (del_timer(&ifp->timer))
219 __in6_ifa_put(ifp);
220 }
221
222 enum addrconf_timer_t
223 {
224 AC_NONE,
225 AC_DAD,
226 AC_RS,
227 };
228
229 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
230 enum addrconf_timer_t what,
231 unsigned long when)
232 {
233 if (!del_timer(&ifp->timer))
234 in6_ifa_hold(ifp);
235
236 switch (what) {
237 case AC_DAD:
238 ifp->timer.function = addrconf_dad_timer;
239 break;
240 case AC_RS:
241 ifp->timer.function = addrconf_rs_timer;
242 break;
243 default:;
244 }
245 ifp->timer.expires = jiffies + when;
246 add_timer(&ifp->timer);
247 }
248
249 /* Nobody refers to this device, we may destroy it. */
250
251 static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
252 {
253 struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
254 kfree(idev);
255 }
256
257 void in6_dev_finish_destroy(struct inet6_dev *idev)
258 {
259 struct net_device *dev = idev->dev;
260 BUG_TRAP(idev->addr_list==NULL);
261 BUG_TRAP(idev->mc_list==NULL);
262 #ifdef NET_REFCNT_DEBUG
263 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
264 #endif
265 dev_put(dev);
266 if (!idev->dead) {
267 printk("Freeing alive inet6 device %p\n", idev);
268 return;
269 }
270 snmp6_free_dev(idev);
271 call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
272 }
273
274 EXPORT_SYMBOL(in6_dev_finish_destroy);
275
276 static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
277 {
278 struct inet6_dev *ndev;
279 struct in6_addr maddr;
280
281 ASSERT_RTNL();
282
283 if (dev->mtu < IPV6_MIN_MTU)
284 return NULL;
285
286 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
287
288 if (ndev == NULL)
289 return NULL;
290
291 rwlock_init(&ndev->lock);
292 ndev->dev = dev;
293 memcpy(&ndev->cnf, &ipv6_devconf_dflt, sizeof(ndev->cnf));
294 ndev->cnf.mtu6 = dev->mtu;
295 ndev->cnf.sysctl = NULL;
296 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
297 if (ndev->nd_parms == NULL) {
298 kfree(ndev);
299 return NULL;
300 }
301 /* We refer to the device */
302 dev_hold(dev);
303
304 if (snmp6_alloc_dev(ndev) < 0) {
305 ADBG((KERN_WARNING
306 "%s(): cannot allocate memory for statistics; dev=%s.\n",
307 __FUNCTION__, dev->name));
308 neigh_parms_release(&nd_tbl, ndev->nd_parms);
309 ndev->dead = 1;
310 in6_dev_finish_destroy(ndev);
311 return NULL;
312 }
313
314 if (snmp6_register_dev(ndev) < 0) {
315 ADBG((KERN_WARNING
316 "%s(): cannot create /proc/net/dev_snmp6/%s\n",
317 __FUNCTION__, dev->name));
318 neigh_parms_release(&nd_tbl, ndev->nd_parms);
319 ndev->dead = 1;
320 in6_dev_finish_destroy(ndev);
321 return NULL;
322 }
323
324 /* One reference from device. We must do this before
325 * we invoke __ipv6_regen_rndid().
326 */
327 in6_dev_hold(ndev);
328
329 #ifdef CONFIG_IPV6_PRIVACY
330 init_timer(&ndev->regen_timer);
331 ndev->regen_timer.function = ipv6_regen_rndid;
332 ndev->regen_timer.data = (unsigned long) ndev;
333 if ((dev->flags&IFF_LOOPBACK) ||
334 dev->type == ARPHRD_TUNNEL ||
335 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
336 dev->type == ARPHRD_SIT ||
337 #endif
338 dev->type == ARPHRD_NONE) {
339 printk(KERN_INFO
340 "%s: Disabled Privacy Extensions\n",
341 dev->name);
342 ndev->cnf.use_tempaddr = -1;
343 } else {
344 in6_dev_hold(ndev);
345 ipv6_regen_rndid((unsigned long) ndev);
346 }
347 #endif
348
349 if (netif_running(dev) && netif_carrier_ok(dev))
350 ndev->if_flags |= IF_READY;
351
352 ipv6_mc_init_dev(ndev);
353 ndev->tstamp = jiffies;
354 #ifdef CONFIG_SYSCTL
355 neigh_sysctl_register(dev, ndev->nd_parms, NET_IPV6,
356 NET_IPV6_NEIGH, "ipv6",
357 &ndisc_ifinfo_sysctl_change,
358 NULL);
359 addrconf_sysctl_register(ndev, &ndev->cnf);
360 #endif
361 /* protected by rtnl_lock */
362 rcu_assign_pointer(dev->ip6_ptr, ndev);
363
364 /* Join all-node multicast group */
365 ipv6_addr_all_nodes(&maddr);
366 ipv6_dev_mc_inc(dev, &maddr);
367
368 return ndev;
369 }
370
371 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
372 {
373 struct inet6_dev *idev;
374
375 ASSERT_RTNL();
376
377 if ((idev = __in6_dev_get(dev)) == NULL) {
378 if ((idev = ipv6_add_dev(dev)) == NULL)
379 return NULL;
380 }
381
382 if (dev->flags&IFF_UP)
383 ipv6_mc_up(idev);
384 return idev;
385 }
386
387 #ifdef CONFIG_SYSCTL
388 static void dev_forward_change(struct inet6_dev *idev)
389 {
390 struct net_device *dev;
391 struct inet6_ifaddr *ifa;
392 struct in6_addr addr;
393
394 if (!idev)
395 return;
396 dev = idev->dev;
397 if (dev && (dev->flags & IFF_MULTICAST)) {
398 ipv6_addr_all_routers(&addr);
399
400 if (idev->cnf.forwarding)
401 ipv6_dev_mc_inc(dev, &addr);
402 else
403 ipv6_dev_mc_dec(dev, &addr);
404 }
405 for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
406 if (ifa->flags&IFA_F_TENTATIVE)
407 continue;
408 if (idev->cnf.forwarding)
409 addrconf_join_anycast(ifa);
410 else
411 addrconf_leave_anycast(ifa);
412 }
413 }
414
415
416 static void addrconf_forward_change(void)
417 {
418 struct net_device *dev;
419 struct inet6_dev *idev;
420
421 read_lock(&dev_base_lock);
422 for (dev=dev_base; dev; dev=dev->next) {
423 rcu_read_lock();
424 idev = __in6_dev_get(dev);
425 if (idev) {
426 int changed = (!idev->cnf.forwarding) ^ (!ipv6_devconf.forwarding);
427 idev->cnf.forwarding = ipv6_devconf.forwarding;
428 if (changed)
429 dev_forward_change(idev);
430 }
431 rcu_read_unlock();
432 }
433 read_unlock(&dev_base_lock);
434 }
435 #endif
436
437 /* Nobody refers to this ifaddr, destroy it */
438
439 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
440 {
441 BUG_TRAP(ifp->if_next==NULL);
442 BUG_TRAP(ifp->lst_next==NULL);
443 #ifdef NET_REFCNT_DEBUG
444 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
445 #endif
446
447 in6_dev_put(ifp->idev);
448
449 if (del_timer(&ifp->timer))
450 printk("Timer is still running, when freeing ifa=%p\n", ifp);
451
452 if (!ifp->dead) {
453 printk("Freeing alive inet6 address %p\n", ifp);
454 return;
455 }
456 dst_release(&ifp->rt->u.dst);
457
458 kfree(ifp);
459 }
460
461 static void
462 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
463 {
464 struct inet6_ifaddr *ifa, **ifap;
465 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
466
467 /*
468 * Each device address list is sorted in order of scope -
469 * global before linklocal.
470 */
471 for (ifap = &idev->addr_list; (ifa = *ifap) != NULL;
472 ifap = &ifa->if_next) {
473 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
474 break;
475 }
476
477 ifp->if_next = *ifap;
478 *ifap = ifp;
479 }
480
481 /* On success it returns ifp with increased reference count */
482
483 static struct inet6_ifaddr *
484 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
485 int scope, u32 flags)
486 {
487 struct inet6_ifaddr *ifa = NULL;
488 struct rt6_info *rt;
489 int hash;
490 int err = 0;
491
492 rcu_read_lock_bh();
493 if (idev->dead) {
494 err = -ENODEV; /*XXX*/
495 goto out2;
496 }
497
498 write_lock(&addrconf_hash_lock);
499
500 /* Ignore adding duplicate addresses on an interface */
501 if (ipv6_chk_same_addr(addr, idev->dev)) {
502 ADBG(("ipv6_add_addr: already assigned\n"));
503 err = -EEXIST;
504 goto out;
505 }
506
507 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
508
509 if (ifa == NULL) {
510 ADBG(("ipv6_add_addr: malloc failed\n"));
511 err = -ENOBUFS;
512 goto out;
513 }
514
515 rt = addrconf_dst_alloc(idev, addr, 0);
516 if (IS_ERR(rt)) {
517 err = PTR_ERR(rt);
518 goto out;
519 }
520
521 ipv6_addr_copy(&ifa->addr, addr);
522
523 spin_lock_init(&ifa->lock);
524 init_timer(&ifa->timer);
525 ifa->timer.data = (unsigned long) ifa;
526 ifa->scope = scope;
527 ifa->prefix_len = pfxlen;
528 ifa->flags = flags | IFA_F_TENTATIVE;
529 ifa->cstamp = ifa->tstamp = jiffies;
530
531 ifa->rt = rt;
532
533 /*
534 * part one of RFC 4429, section 3.3
535 * We should not configure an address as
536 * optimistic if we do not yet know the link
537 * layer address of our nexhop router
538 */
539
540 if (rt->rt6i_nexthop == NULL)
541 ifa->flags &= ~IFA_F_OPTIMISTIC;
542
543 ifa->idev = idev;
544 in6_dev_hold(idev);
545 /* For caller */
546 in6_ifa_hold(ifa);
547
548 /* Add to big hash table */
549 hash = ipv6_addr_hash(addr);
550
551 ifa->lst_next = inet6_addr_lst[hash];
552 inet6_addr_lst[hash] = ifa;
553 in6_ifa_hold(ifa);
554 write_unlock(&addrconf_hash_lock);
555
556 write_lock(&idev->lock);
557 /* Add to inet6_dev unicast addr list. */
558 ipv6_link_dev_addr(idev, ifa);
559
560 #ifdef CONFIG_IPV6_PRIVACY
561 if (ifa->flags&IFA_F_TEMPORARY) {
562 ifa->tmp_next = idev->tempaddr_list;
563 idev->tempaddr_list = ifa;
564 in6_ifa_hold(ifa);
565 }
566 #endif
567
568 in6_ifa_hold(ifa);
569 write_unlock(&idev->lock);
570 out2:
571 rcu_read_unlock_bh();
572
573 if (likely(err == 0))
574 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
575 else {
576 kfree(ifa);
577 ifa = ERR_PTR(err);
578 }
579
580 return ifa;
581 out:
582 write_unlock(&addrconf_hash_lock);
583 goto out2;
584 }
585
586 /* This function wants to get referenced ifp and releases it before return */
587
588 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
589 {
590 struct inet6_ifaddr *ifa, **ifap;
591 struct inet6_dev *idev = ifp->idev;
592 int hash;
593 int deleted = 0, onlink = 0;
594 unsigned long expires = jiffies;
595
596 hash = ipv6_addr_hash(&ifp->addr);
597
598 ifp->dead = 1;
599
600 write_lock_bh(&addrconf_hash_lock);
601 for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
602 ifap = &ifa->lst_next) {
603 if (ifa == ifp) {
604 *ifap = ifa->lst_next;
605 __in6_ifa_put(ifp);
606 ifa->lst_next = NULL;
607 break;
608 }
609 }
610 write_unlock_bh(&addrconf_hash_lock);
611
612 write_lock_bh(&idev->lock);
613 #ifdef CONFIG_IPV6_PRIVACY
614 if (ifp->flags&IFA_F_TEMPORARY) {
615 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
616 ifap = &ifa->tmp_next) {
617 if (ifa == ifp) {
618 *ifap = ifa->tmp_next;
619 if (ifp->ifpub) {
620 in6_ifa_put(ifp->ifpub);
621 ifp->ifpub = NULL;
622 }
623 __in6_ifa_put(ifp);
624 ifa->tmp_next = NULL;
625 break;
626 }
627 }
628 }
629 #endif
630
631 for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
632 if (ifa == ifp) {
633 *ifap = ifa->if_next;
634 __in6_ifa_put(ifp);
635 ifa->if_next = NULL;
636 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
637 break;
638 deleted = 1;
639 continue;
640 } else if (ifp->flags & IFA_F_PERMANENT) {
641 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
642 ifp->prefix_len)) {
643 if (ifa->flags & IFA_F_PERMANENT) {
644 onlink = 1;
645 if (deleted)
646 break;
647 } else {
648 unsigned long lifetime;
649
650 if (!onlink)
651 onlink = -1;
652
653 spin_lock(&ifa->lock);
654 lifetime = min_t(unsigned long,
655 ifa->valid_lft, 0x7fffffffUL/HZ);
656 if (time_before(expires,
657 ifa->tstamp + lifetime * HZ))
658 expires = ifa->tstamp + lifetime * HZ;
659 spin_unlock(&ifa->lock);
660 }
661 }
662 }
663 ifap = &ifa->if_next;
664 }
665 write_unlock_bh(&idev->lock);
666
667 ipv6_ifa_notify(RTM_DELADDR, ifp);
668
669 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
670
671 addrconf_del_timer(ifp);
672
673 /*
674 * Purge or update corresponding prefix
675 *
676 * 1) we don't purge prefix here if address was not permanent.
677 * prefix is managed by its own lifetime.
678 * 2) if there're no addresses, delete prefix.
679 * 3) if there're still other permanent address(es),
680 * corresponding prefix is still permanent.
681 * 4) otherwise, update prefix lifetime to the
682 * longest valid lifetime among the corresponding
683 * addresses on the device.
684 * Note: subsequent RA will update lifetime.
685 *
686 * --yoshfuji
687 */
688 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
689 struct in6_addr prefix;
690 struct rt6_info *rt;
691
692 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
693 rt = rt6_lookup(&prefix, NULL, ifp->idev->dev->ifindex, 1);
694
695 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
696 if (onlink == 0) {
697 ip6_del_rt(rt);
698 rt = NULL;
699 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
700 rt->rt6i_expires = expires;
701 rt->rt6i_flags |= RTF_EXPIRES;
702 }
703 }
704 dst_release(&rt->u.dst);
705 }
706
707 in6_ifa_put(ifp);
708 }
709
710 #ifdef CONFIG_IPV6_PRIVACY
711 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
712 {
713 struct inet6_dev *idev = ifp->idev;
714 struct in6_addr addr, *tmpaddr;
715 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
716 int tmp_plen;
717 int ret = 0;
718 int max_addresses;
719 u32 addr_flags;
720
721 write_lock(&idev->lock);
722 if (ift) {
723 spin_lock_bh(&ift->lock);
724 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
725 spin_unlock_bh(&ift->lock);
726 tmpaddr = &addr;
727 } else {
728 tmpaddr = NULL;
729 }
730 retry:
731 in6_dev_hold(idev);
732 if (idev->cnf.use_tempaddr <= 0) {
733 write_unlock(&idev->lock);
734 printk(KERN_INFO
735 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
736 in6_dev_put(idev);
737 ret = -1;
738 goto out;
739 }
740 spin_lock_bh(&ifp->lock);
741 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
742 idev->cnf.use_tempaddr = -1; /*XXX*/
743 spin_unlock_bh(&ifp->lock);
744 write_unlock(&idev->lock);
745 printk(KERN_WARNING
746 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
747 in6_dev_put(idev);
748 ret = -1;
749 goto out;
750 }
751 in6_ifa_hold(ifp);
752 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
753 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
754 spin_unlock_bh(&ifp->lock);
755 write_unlock(&idev->lock);
756 printk(KERN_WARNING
757 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
758 in6_ifa_put(ifp);
759 in6_dev_put(idev);
760 ret = -1;
761 goto out;
762 }
763 memcpy(&addr.s6_addr[8], idev->rndid, 8);
764 tmp_valid_lft = min_t(__u32,
765 ifp->valid_lft,
766 idev->cnf.temp_valid_lft);
767 tmp_prefered_lft = min_t(__u32,
768 ifp->prefered_lft,
769 idev->cnf.temp_prefered_lft - desync_factor / HZ);
770 tmp_plen = ifp->prefix_len;
771 max_addresses = idev->cnf.max_addresses;
772 tmp_cstamp = ifp->cstamp;
773 tmp_tstamp = ifp->tstamp;
774 spin_unlock_bh(&ifp->lock);
775
776 write_unlock(&idev->lock);
777
778 addr_flags = IFA_F_TEMPORARY;
779 /* set in addrconf_prefix_rcv() */
780 if (ifp->flags & IFA_F_OPTIMISTIC)
781 addr_flags |= IFA_F_OPTIMISTIC;
782
783 ift = !max_addresses ||
784 ipv6_count_addresses(idev) < max_addresses ?
785 ipv6_add_addr(idev, &addr, tmp_plen,
786 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
787 addr_flags) : NULL;
788 if (!ift || IS_ERR(ift)) {
789 in6_ifa_put(ifp);
790 in6_dev_put(idev);
791 printk(KERN_INFO
792 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
793 tmpaddr = &addr;
794 write_lock(&idev->lock);
795 goto retry;
796 }
797
798 spin_lock_bh(&ift->lock);
799 ift->ifpub = ifp;
800 ift->valid_lft = tmp_valid_lft;
801 ift->prefered_lft = tmp_prefered_lft;
802 ift->cstamp = tmp_cstamp;
803 ift->tstamp = tmp_tstamp;
804 spin_unlock_bh(&ift->lock);
805
806 addrconf_dad_start(ift, 0);
807 in6_ifa_put(ift);
808 in6_dev_put(idev);
809 out:
810 return ret;
811 }
812 #endif
813
814 /*
815 * Choose an appropriate source address (RFC3484)
816 */
817 struct ipv6_saddr_score {
818 int addr_type;
819 unsigned int attrs;
820 int matchlen;
821 int scope;
822 unsigned int rule;
823 };
824
825 #define IPV6_SADDR_SCORE_LOCAL 0x0001
826 #define IPV6_SADDR_SCORE_PREFERRED 0x0004
827 #define IPV6_SADDR_SCORE_HOA 0x0008
828 #define IPV6_SADDR_SCORE_OIF 0x0010
829 #define IPV6_SADDR_SCORE_LABEL 0x0020
830 #define IPV6_SADDR_SCORE_PRIVACY 0x0040
831
832 static inline int ipv6_saddr_preferred(int type)
833 {
834 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
835 IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
836 return 1;
837 return 0;
838 }
839
840 /* static matching label */
841 static inline int ipv6_saddr_label(const struct in6_addr *addr, int type)
842 {
843 /*
844 * prefix (longest match) label
845 * -----------------------------
846 * ::1/128 0
847 * ::/0 1
848 * 2002::/16 2
849 * ::/96 3
850 * ::ffff:0:0/96 4
851 * fc00::/7 5
852 * 2001::/32 6
853 */
854 if (type & IPV6_ADDR_LOOPBACK)
855 return 0;
856 else if (type & IPV6_ADDR_COMPATv4)
857 return 3;
858 else if (type & IPV6_ADDR_MAPPED)
859 return 4;
860 else if (addr->s6_addr32[0] == htonl(0x20010000))
861 return 6;
862 else if (addr->s6_addr16[0] == htons(0x2002))
863 return 2;
864 else if ((addr->s6_addr[0] & 0xfe) == 0xfc)
865 return 5;
866 return 1;
867 }
868
869 int ipv6_dev_get_saddr(struct net_device *daddr_dev,
870 struct in6_addr *daddr, struct in6_addr *saddr)
871 {
872 struct ipv6_saddr_score hiscore;
873 struct inet6_ifaddr *ifa_result = NULL;
874 int daddr_type = __ipv6_addr_type(daddr);
875 int daddr_scope = __ipv6_addr_src_scope(daddr_type);
876 u32 daddr_label = ipv6_saddr_label(daddr, daddr_type);
877 struct net_device *dev;
878
879 memset(&hiscore, 0, sizeof(hiscore));
880
881 read_lock(&dev_base_lock);
882 rcu_read_lock();
883
884 for (dev = dev_base; dev; dev=dev->next) {
885 struct inet6_dev *idev;
886 struct inet6_ifaddr *ifa;
887
888 /* Rule 0: Candidate Source Address (section 4)
889 * - multicast and link-local destination address,
890 * the set of candidate source address MUST only
891 * include addresses assigned to interfaces
892 * belonging to the same link as the outgoing
893 * interface.
894 * (- For site-local destination addresses, the
895 * set of candidate source addresses MUST only
896 * include addresses assigned to interfaces
897 * belonging to the same site as the outgoing
898 * interface.)
899 */
900 if ((daddr_type & IPV6_ADDR_MULTICAST ||
901 daddr_scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
902 daddr_dev && dev != daddr_dev)
903 continue;
904
905 idev = __in6_dev_get(dev);
906 if (!idev)
907 continue;
908
909 read_lock_bh(&idev->lock);
910 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
911 struct ipv6_saddr_score score;
912
913 score.addr_type = __ipv6_addr_type(&ifa->addr);
914
915 /* Rule 0:
916 * - Tentative Address (RFC2462 section 5.4)
917 * - A tentative address is not considered
918 * "assigned to an interface" in the traditional
919 * sense, unless it is also flagged as optimistic.
920 * - Candidate Source Address (section 4)
921 * - In any case, anycast addresses, multicast
922 * addresses, and the unspecified address MUST
923 * NOT be included in a candidate set.
924 */
925 if ((ifa->flags & IFA_F_TENTATIVE) &&
926 (!(ifa->flags & IFA_F_OPTIMISTIC)))
927 continue;
928 if (unlikely(score.addr_type == IPV6_ADDR_ANY ||
929 score.addr_type & IPV6_ADDR_MULTICAST)) {
930 LIMIT_NETDEBUG(KERN_DEBUG
931 "ADDRCONF: unspecified / multicast address"
932 "assigned as unicast address on %s",
933 dev->name);
934 continue;
935 }
936
937 score.attrs = 0;
938 score.matchlen = 0;
939 score.scope = 0;
940 score.rule = 0;
941
942 if (ifa_result == NULL) {
943 /* record it if the first available entry */
944 goto record_it;
945 }
946
947 /* Rule 1: Prefer same address */
948 if (hiscore.rule < 1) {
949 if (ipv6_addr_equal(&ifa_result->addr, daddr))
950 hiscore.attrs |= IPV6_SADDR_SCORE_LOCAL;
951 hiscore.rule++;
952 }
953 if (ipv6_addr_equal(&ifa->addr, daddr)) {
954 score.attrs |= IPV6_SADDR_SCORE_LOCAL;
955 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)) {
956 score.rule = 1;
957 goto record_it;
958 }
959 } else {
960 if (hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)
961 continue;
962 }
963
964 /* Rule 2: Prefer appropriate scope */
965 if (hiscore.rule < 2) {
966 hiscore.scope = __ipv6_addr_src_scope(hiscore.addr_type);
967 hiscore.rule++;
968 }
969 score.scope = __ipv6_addr_src_scope(score.addr_type);
970 if (hiscore.scope < score.scope) {
971 if (hiscore.scope < daddr_scope) {
972 score.rule = 2;
973 goto record_it;
974 } else
975 continue;
976 } else if (score.scope < hiscore.scope) {
977 if (score.scope < daddr_scope)
978 break; /* addresses sorted by scope */
979 else {
980 score.rule = 2;
981 goto record_it;
982 }
983 }
984
985 /* Rule 3: Avoid deprecated and optimistic addresses */
986 if (hiscore.rule < 3) {
987 if (ipv6_saddr_preferred(hiscore.addr_type) ||
988 (((ifa_result->flags &
989 (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)) == 0)))
990 hiscore.attrs |= IPV6_SADDR_SCORE_PREFERRED;
991 hiscore.rule++;
992 }
993 if (ipv6_saddr_preferred(score.addr_type) ||
994 (((ifa_result->flags &
995 (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)) == 0))) {
996 score.attrs |= IPV6_SADDR_SCORE_PREFERRED;
997 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)) {
998 score.rule = 3;
999 goto record_it;
1000 }
1001 } else {
1002 if (hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)
1003 continue;
1004 }
1005
1006 /* Rule 4: Prefer home address */
1007 #ifdef CONFIG_IPV6_MIP6
1008 if (hiscore.rule < 4) {
1009 if (ifa_result->flags & IFA_F_HOMEADDRESS)
1010 hiscore.attrs |= IPV6_SADDR_SCORE_HOA;
1011 hiscore.rule++;
1012 }
1013 if (ifa->flags & IFA_F_HOMEADDRESS) {
1014 score.attrs |= IPV6_SADDR_SCORE_HOA;
1015 if (!(ifa_result->flags & IFA_F_HOMEADDRESS)) {
1016 score.rule = 4;
1017 goto record_it;
1018 }
1019 } else {
1020 if (hiscore.attrs & IPV6_SADDR_SCORE_HOA)
1021 continue;
1022 }
1023 #else
1024 if (hiscore.rule < 4)
1025 hiscore.rule++;
1026 #endif
1027
1028 /* Rule 5: Prefer outgoing interface */
1029 if (hiscore.rule < 5) {
1030 if (daddr_dev == NULL ||
1031 daddr_dev == ifa_result->idev->dev)
1032 hiscore.attrs |= IPV6_SADDR_SCORE_OIF;
1033 hiscore.rule++;
1034 }
1035 if (daddr_dev == NULL ||
1036 daddr_dev == ifa->idev->dev) {
1037 score.attrs |= IPV6_SADDR_SCORE_OIF;
1038 if (!(hiscore.attrs & IPV6_SADDR_SCORE_OIF)) {
1039 score.rule = 5;
1040 goto record_it;
1041 }
1042 } else {
1043 if (hiscore.attrs & IPV6_SADDR_SCORE_OIF)
1044 continue;
1045 }
1046
1047 /* Rule 6: Prefer matching label */
1048 if (hiscore.rule < 6) {
1049 if (ipv6_saddr_label(&ifa_result->addr, hiscore.addr_type) == daddr_label)
1050 hiscore.attrs |= IPV6_SADDR_SCORE_LABEL;
1051 hiscore.rule++;
1052 }
1053 if (ipv6_saddr_label(&ifa->addr, score.addr_type) == daddr_label) {
1054 score.attrs |= IPV6_SADDR_SCORE_LABEL;
1055 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LABEL)) {
1056 score.rule = 6;
1057 goto record_it;
1058 }
1059 } else {
1060 if (hiscore.attrs & IPV6_SADDR_SCORE_LABEL)
1061 continue;
1062 }
1063
1064 #ifdef CONFIG_IPV6_PRIVACY
1065 /* Rule 7: Prefer public address
1066 * Note: prefer temprary address if use_tempaddr >= 2
1067 */
1068 if (hiscore.rule < 7) {
1069 if ((!(ifa_result->flags & IFA_F_TEMPORARY)) ^
1070 (ifa_result->idev->cnf.use_tempaddr >= 2))
1071 hiscore.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1072 hiscore.rule++;
1073 }
1074 if ((!(ifa->flags & IFA_F_TEMPORARY)) ^
1075 (ifa->idev->cnf.use_tempaddr >= 2)) {
1076 score.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1077 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)) {
1078 score.rule = 7;
1079 goto record_it;
1080 }
1081 } else {
1082 if (hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)
1083 continue;
1084 }
1085 #else
1086 if (hiscore.rule < 7)
1087 hiscore.rule++;
1088 #endif
1089 /* Rule 8: Use longest matching prefix */
1090 if (hiscore.rule < 8) {
1091 hiscore.matchlen = ipv6_addr_diff(&ifa_result->addr, daddr);
1092 hiscore.rule++;
1093 }
1094 score.matchlen = ipv6_addr_diff(&ifa->addr, daddr);
1095 if (score.matchlen > hiscore.matchlen) {
1096 score.rule = 8;
1097 goto record_it;
1098 }
1099 #if 0
1100 else if (score.matchlen < hiscore.matchlen)
1101 continue;
1102 #endif
1103
1104 /* Final Rule: choose first available one */
1105 continue;
1106 record_it:
1107 if (ifa_result)
1108 in6_ifa_put(ifa_result);
1109 in6_ifa_hold(ifa);
1110 ifa_result = ifa;
1111 hiscore = score;
1112 }
1113 read_unlock_bh(&idev->lock);
1114 }
1115 rcu_read_unlock();
1116 read_unlock(&dev_base_lock);
1117
1118 if (!ifa_result)
1119 return -EADDRNOTAVAIL;
1120
1121 ipv6_addr_copy(saddr, &ifa_result->addr);
1122 in6_ifa_put(ifa_result);
1123 return 0;
1124 }
1125
1126
1127 int ipv6_get_saddr(struct dst_entry *dst,
1128 struct in6_addr *daddr, struct in6_addr *saddr)
1129 {
1130 return ipv6_dev_get_saddr(dst ? ip6_dst_idev(dst)->dev : NULL, daddr, saddr);
1131 }
1132
1133 EXPORT_SYMBOL(ipv6_get_saddr);
1134
1135 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1136 unsigned char banned_flags)
1137 {
1138 struct inet6_dev *idev;
1139 int err = -EADDRNOTAVAIL;
1140
1141 rcu_read_lock();
1142 if ((idev = __in6_dev_get(dev)) != NULL) {
1143 struct inet6_ifaddr *ifp;
1144
1145 read_lock_bh(&idev->lock);
1146 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1147 if (ifp->scope == IFA_LINK && !(ifp->flags & banned_flags)) {
1148 ipv6_addr_copy(addr, &ifp->addr);
1149 err = 0;
1150 break;
1151 }
1152 }
1153 read_unlock_bh(&idev->lock);
1154 }
1155 rcu_read_unlock();
1156 return err;
1157 }
1158
1159 static int ipv6_count_addresses(struct inet6_dev *idev)
1160 {
1161 int cnt = 0;
1162 struct inet6_ifaddr *ifp;
1163
1164 read_lock_bh(&idev->lock);
1165 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1166 cnt++;
1167 read_unlock_bh(&idev->lock);
1168 return cnt;
1169 }
1170
1171 int ipv6_chk_addr(struct in6_addr *addr, struct net_device *dev, int strict)
1172 {
1173 struct inet6_ifaddr * ifp;
1174 u8 hash = ipv6_addr_hash(addr);
1175
1176 read_lock_bh(&addrconf_hash_lock);
1177 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1178 if (ipv6_addr_equal(&ifp->addr, addr) &&
1179 !(ifp->flags&IFA_F_TENTATIVE)) {
1180 if (dev == NULL || ifp->idev->dev == dev ||
1181 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1182 break;
1183 }
1184 }
1185 read_unlock_bh(&addrconf_hash_lock);
1186 return ifp != NULL;
1187 }
1188
1189 EXPORT_SYMBOL(ipv6_chk_addr);
1190
1191 static
1192 int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev)
1193 {
1194 struct inet6_ifaddr * ifp;
1195 u8 hash = ipv6_addr_hash(addr);
1196
1197 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1198 if (ipv6_addr_equal(&ifp->addr, addr)) {
1199 if (dev == NULL || ifp->idev->dev == dev)
1200 break;
1201 }
1202 }
1203 return ifp != NULL;
1204 }
1205
1206 struct inet6_ifaddr * ipv6_get_ifaddr(struct in6_addr *addr, struct net_device *dev, int strict)
1207 {
1208 struct inet6_ifaddr * ifp;
1209 u8 hash = ipv6_addr_hash(addr);
1210
1211 read_lock_bh(&addrconf_hash_lock);
1212 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1213 if (ipv6_addr_equal(&ifp->addr, addr)) {
1214 if (dev == NULL || ifp->idev->dev == dev ||
1215 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1216 in6_ifa_hold(ifp);
1217 break;
1218 }
1219 }
1220 }
1221 read_unlock_bh(&addrconf_hash_lock);
1222
1223 return ifp;
1224 }
1225
1226 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1227 {
1228 const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
1229 const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
1230 __be32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
1231 __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1232 int sk_ipv6only = ipv6_only_sock(sk);
1233 int sk2_ipv6only = inet_v6_ipv6only(sk2);
1234 int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1235 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1236
1237 if (!sk2_rcv_saddr && !sk_ipv6only)
1238 return 1;
1239
1240 if (addr_type2 == IPV6_ADDR_ANY &&
1241 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1242 return 1;
1243
1244 if (addr_type == IPV6_ADDR_ANY &&
1245 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1246 return 1;
1247
1248 if (sk2_rcv_saddr6 &&
1249 ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1250 return 1;
1251
1252 if (addr_type == IPV6_ADDR_MAPPED &&
1253 !sk2_ipv6only &&
1254 (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1255 return 1;
1256
1257 return 0;
1258 }
1259
1260 /* Gets referenced address, destroys ifaddr */
1261
1262 static void addrconf_dad_stop(struct inet6_ifaddr *ifp)
1263 {
1264 if (ifp->flags&IFA_F_PERMANENT) {
1265 spin_lock_bh(&ifp->lock);
1266 addrconf_del_timer(ifp);
1267 ifp->flags |= IFA_F_TENTATIVE;
1268 spin_unlock_bh(&ifp->lock);
1269 in6_ifa_put(ifp);
1270 #ifdef CONFIG_IPV6_PRIVACY
1271 } else if (ifp->flags&IFA_F_TEMPORARY) {
1272 struct inet6_ifaddr *ifpub;
1273 spin_lock_bh(&ifp->lock);
1274 ifpub = ifp->ifpub;
1275 if (ifpub) {
1276 in6_ifa_hold(ifpub);
1277 spin_unlock_bh(&ifp->lock);
1278 ipv6_create_tempaddr(ifpub, ifp);
1279 in6_ifa_put(ifpub);
1280 } else {
1281 spin_unlock_bh(&ifp->lock);
1282 }
1283 ipv6_del_addr(ifp);
1284 #endif
1285 } else
1286 ipv6_del_addr(ifp);
1287 }
1288
1289 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1290 {
1291 if (net_ratelimit())
1292 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1293 addrconf_dad_stop(ifp);
1294 }
1295
1296 /* Join to solicited addr multicast group. */
1297
1298 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1299 {
1300 struct in6_addr maddr;
1301
1302 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1303 return;
1304
1305 addrconf_addr_solict_mult(addr, &maddr);
1306 ipv6_dev_mc_inc(dev, &maddr);
1307 }
1308
1309 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1310 {
1311 struct in6_addr maddr;
1312
1313 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1314 return;
1315
1316 addrconf_addr_solict_mult(addr, &maddr);
1317 __ipv6_dev_mc_dec(idev, &maddr);
1318 }
1319
1320 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1321 {
1322 struct in6_addr addr;
1323 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1324 if (ipv6_addr_any(&addr))
1325 return;
1326 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1327 }
1328
1329 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1330 {
1331 struct in6_addr addr;
1332 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1333 if (ipv6_addr_any(&addr))
1334 return;
1335 __ipv6_dev_ac_dec(ifp->idev, &addr);
1336 }
1337
1338 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1339 {
1340 if (dev->addr_len != ETH_ALEN)
1341 return -1;
1342 memcpy(eui, dev->dev_addr, 3);
1343 memcpy(eui + 5, dev->dev_addr + 3, 3);
1344
1345 /*
1346 * The zSeries OSA network cards can be shared among various
1347 * OS instances, but the OSA cards have only one MAC address.
1348 * This leads to duplicate address conflicts in conjunction
1349 * with IPv6 if more than one instance uses the same card.
1350 *
1351 * The driver for these cards can deliver a unique 16-bit
1352 * identifier for each instance sharing the same card. It is
1353 * placed instead of 0xFFFE in the interface identifier. The
1354 * "u" bit of the interface identifier is not inverted in this
1355 * case. Hence the resulting interface identifier has local
1356 * scope according to RFC2373.
1357 */
1358 if (dev->dev_id) {
1359 eui[3] = (dev->dev_id >> 8) & 0xFF;
1360 eui[4] = dev->dev_id & 0xFF;
1361 } else {
1362 eui[3] = 0xFF;
1363 eui[4] = 0xFE;
1364 eui[0] ^= 2;
1365 }
1366 return 0;
1367 }
1368
1369 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1370 {
1371 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1372 if (dev->addr_len != ARCNET_ALEN)
1373 return -1;
1374 memset(eui, 0, 7);
1375 eui[7] = *(u8*)dev->dev_addr;
1376 return 0;
1377 }
1378
1379 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1380 {
1381 if (dev->addr_len != INFINIBAND_ALEN)
1382 return -1;
1383 memcpy(eui, dev->dev_addr + 12, 8);
1384 eui[0] |= 2;
1385 return 0;
1386 }
1387
1388 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1389 {
1390 switch (dev->type) {
1391 case ARPHRD_ETHER:
1392 case ARPHRD_FDDI:
1393 case ARPHRD_IEEE802_TR:
1394 return addrconf_ifid_eui48(eui, dev);
1395 case ARPHRD_ARCNET:
1396 return addrconf_ifid_arcnet(eui, dev);
1397 case ARPHRD_INFINIBAND:
1398 return addrconf_ifid_infiniband(eui, dev);
1399 }
1400 return -1;
1401 }
1402
1403 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1404 {
1405 int err = -1;
1406 struct inet6_ifaddr *ifp;
1407
1408 read_lock_bh(&idev->lock);
1409 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1410 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1411 memcpy(eui, ifp->addr.s6_addr+8, 8);
1412 err = 0;
1413 break;
1414 }
1415 }
1416 read_unlock_bh(&idev->lock);
1417 return err;
1418 }
1419
1420 #ifdef CONFIG_IPV6_PRIVACY
1421 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1422 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1423 {
1424 regen:
1425 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1426 idev->rndid[0] &= ~0x02;
1427
1428 /*
1429 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1430 * check if generated address is not inappropriate
1431 *
1432 * - Reserved subnet anycast (RFC 2526)
1433 * 11111101 11....11 1xxxxxxx
1434 * - ISATAP (draft-ietf-ngtrans-isatap-13.txt) 5.1
1435 * 00-00-5E-FE-xx-xx-xx-xx
1436 * - value 0
1437 * - XXX: already assigned to an address on the device
1438 */
1439 if (idev->rndid[0] == 0xfd &&
1440 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1441 (idev->rndid[7]&0x80))
1442 goto regen;
1443 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1444 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1445 goto regen;
1446 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1447 goto regen;
1448 }
1449
1450 return 0;
1451 }
1452
1453 static void ipv6_regen_rndid(unsigned long data)
1454 {
1455 struct inet6_dev *idev = (struct inet6_dev *) data;
1456 unsigned long expires;
1457
1458 rcu_read_lock_bh();
1459 write_lock_bh(&idev->lock);
1460
1461 if (idev->dead)
1462 goto out;
1463
1464 if (__ipv6_regen_rndid(idev) < 0)
1465 goto out;
1466
1467 expires = jiffies +
1468 idev->cnf.temp_prefered_lft * HZ -
1469 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1470 if (time_before(expires, jiffies)) {
1471 printk(KERN_WARNING
1472 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1473 idev->dev->name);
1474 goto out;
1475 }
1476
1477 if (!mod_timer(&idev->regen_timer, expires))
1478 in6_dev_hold(idev);
1479
1480 out:
1481 write_unlock_bh(&idev->lock);
1482 rcu_read_unlock_bh();
1483 in6_dev_put(idev);
1484 }
1485
1486 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1487 int ret = 0;
1488
1489 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1490 ret = __ipv6_regen_rndid(idev);
1491 return ret;
1492 }
1493 #endif
1494
1495 /*
1496 * Add prefix route.
1497 */
1498
1499 static void
1500 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1501 unsigned long expires, u32 flags)
1502 {
1503 struct fib6_config cfg = {
1504 .fc_table = RT6_TABLE_PREFIX,
1505 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1506 .fc_ifindex = dev->ifindex,
1507 .fc_expires = expires,
1508 .fc_dst_len = plen,
1509 .fc_flags = RTF_UP | flags,
1510 };
1511
1512 ipv6_addr_copy(&cfg.fc_dst, pfx);
1513
1514 /* Prevent useless cloning on PtP SIT.
1515 This thing is done here expecting that the whole
1516 class of non-broadcast devices need not cloning.
1517 */
1518 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1519 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1520 cfg.fc_flags |= RTF_NONEXTHOP;
1521 #endif
1522
1523 ip6_route_add(&cfg);
1524 }
1525
1526 /* Create "default" multicast route to the interface */
1527
1528 static void addrconf_add_mroute(struct net_device *dev)
1529 {
1530 struct fib6_config cfg = {
1531 .fc_table = RT6_TABLE_LOCAL,
1532 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1533 .fc_ifindex = dev->ifindex,
1534 .fc_dst_len = 8,
1535 .fc_flags = RTF_UP,
1536 };
1537
1538 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1539
1540 ip6_route_add(&cfg);
1541 }
1542
1543 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1544 static void sit_route_add(struct net_device *dev)
1545 {
1546 struct fib6_config cfg = {
1547 .fc_table = RT6_TABLE_MAIN,
1548 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1549 .fc_ifindex = dev->ifindex,
1550 .fc_dst_len = 96,
1551 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1552 };
1553
1554 /* prefix length - 96 bits "::d.d.d.d" */
1555 ip6_route_add(&cfg);
1556 }
1557 #endif
1558
1559 static void addrconf_add_lroute(struct net_device *dev)
1560 {
1561 struct in6_addr addr;
1562
1563 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1564 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1565 }
1566
1567 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1568 {
1569 struct inet6_dev *idev;
1570
1571 ASSERT_RTNL();
1572
1573 if ((idev = ipv6_find_idev(dev)) == NULL)
1574 return NULL;
1575
1576 /* Add default multicast route */
1577 addrconf_add_mroute(dev);
1578
1579 /* Add link local route */
1580 addrconf_add_lroute(dev);
1581 return idev;
1582 }
1583
1584 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1585 {
1586 struct prefix_info *pinfo;
1587 __u32 valid_lft;
1588 __u32 prefered_lft;
1589 int addr_type;
1590 unsigned long rt_expires;
1591 struct inet6_dev *in6_dev;
1592
1593 pinfo = (struct prefix_info *) opt;
1594
1595 if (len < sizeof(struct prefix_info)) {
1596 ADBG(("addrconf: prefix option too short\n"));
1597 return;
1598 }
1599
1600 /*
1601 * Validation checks ([ADDRCONF], page 19)
1602 */
1603
1604 addr_type = ipv6_addr_type(&pinfo->prefix);
1605
1606 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1607 return;
1608
1609 valid_lft = ntohl(pinfo->valid);
1610 prefered_lft = ntohl(pinfo->prefered);
1611
1612 if (prefered_lft > valid_lft) {
1613 if (net_ratelimit())
1614 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1615 return;
1616 }
1617
1618 in6_dev = in6_dev_get(dev);
1619
1620 if (in6_dev == NULL) {
1621 if (net_ratelimit())
1622 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1623 return;
1624 }
1625
1626 /*
1627 * Two things going on here:
1628 * 1) Add routes for on-link prefixes
1629 * 2) Configure prefixes with the auto flag set
1630 */
1631
1632 /* Avoid arithmetic overflow. Really, we could
1633 save rt_expires in seconds, likely valid_lft,
1634 but it would require division in fib gc, that it
1635 not good.
1636 */
1637 if (valid_lft >= 0x7FFFFFFF/HZ)
1638 rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ);
1639 else
1640 rt_expires = valid_lft * HZ;
1641
1642 /*
1643 * We convert this (in jiffies) to clock_t later.
1644 * Avoid arithmetic overflow there as well.
1645 * Overflow can happen only if HZ < USER_HZ.
1646 */
1647 if (HZ < USER_HZ && rt_expires > 0x7FFFFFFF / USER_HZ)
1648 rt_expires = 0x7FFFFFFF / USER_HZ;
1649
1650 if (pinfo->onlink) {
1651 struct rt6_info *rt;
1652 rt = rt6_lookup(&pinfo->prefix, NULL, dev->ifindex, 1);
1653
1654 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
1655 if (rt->rt6i_flags&RTF_EXPIRES) {
1656 if (valid_lft == 0) {
1657 ip6_del_rt(rt);
1658 rt = NULL;
1659 } else {
1660 rt->rt6i_expires = jiffies + rt_expires;
1661 }
1662 }
1663 } else if (valid_lft) {
1664 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1665 dev, jiffies_to_clock_t(rt_expires), RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT);
1666 }
1667 if (rt)
1668 dst_release(&rt->u.dst);
1669 }
1670
1671 /* Try to figure out our local address for this prefix */
1672
1673 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1674 struct inet6_ifaddr * ifp;
1675 struct in6_addr addr;
1676 int create = 0, update_lft = 0;
1677
1678 if (pinfo->prefix_len == 64) {
1679 memcpy(&addr, &pinfo->prefix, 8);
1680 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1681 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1682 in6_dev_put(in6_dev);
1683 return;
1684 }
1685 goto ok;
1686 }
1687 if (net_ratelimit())
1688 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1689 pinfo->prefix_len);
1690 in6_dev_put(in6_dev);
1691 return;
1692
1693 ok:
1694
1695 ifp = ipv6_get_ifaddr(&addr, dev, 1);
1696
1697 if (ifp == NULL && valid_lft) {
1698 int max_addresses = in6_dev->cnf.max_addresses;
1699 u32 addr_flags = 0;
1700
1701 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1702 if (in6_dev->cnf.optimistic_dad &&
1703 !ipv6_devconf.forwarding)
1704 addr_flags = IFA_F_OPTIMISTIC;
1705 #endif
1706
1707 /* Do not allow to create too much of autoconfigured
1708 * addresses; this would be too easy way to crash kernel.
1709 */
1710 if (!max_addresses ||
1711 ipv6_count_addresses(in6_dev) < max_addresses)
1712 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1713 addr_type&IPV6_ADDR_SCOPE_MASK,
1714 addr_flags);
1715
1716 if (!ifp || IS_ERR(ifp)) {
1717 in6_dev_put(in6_dev);
1718 return;
1719 }
1720
1721 update_lft = create = 1;
1722 ifp->cstamp = jiffies;
1723 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1724 }
1725
1726 if (ifp) {
1727 int flags;
1728 unsigned long now;
1729 #ifdef CONFIG_IPV6_PRIVACY
1730 struct inet6_ifaddr *ift;
1731 #endif
1732 u32 stored_lft;
1733
1734 /* update lifetime (RFC2462 5.5.3 e) */
1735 spin_lock(&ifp->lock);
1736 now = jiffies;
1737 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1738 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1739 else
1740 stored_lft = 0;
1741 if (!update_lft && stored_lft) {
1742 if (valid_lft > MIN_VALID_LIFETIME ||
1743 valid_lft > stored_lft)
1744 update_lft = 1;
1745 else if (stored_lft <= MIN_VALID_LIFETIME) {
1746 /* valid_lft <= stored_lft is always true */
1747 /* XXX: IPsec */
1748 update_lft = 0;
1749 } else {
1750 valid_lft = MIN_VALID_LIFETIME;
1751 if (valid_lft < prefered_lft)
1752 prefered_lft = valid_lft;
1753 update_lft = 1;
1754 }
1755 }
1756
1757 if (update_lft) {
1758 ifp->valid_lft = valid_lft;
1759 ifp->prefered_lft = prefered_lft;
1760 ifp->tstamp = now;
1761 flags = ifp->flags;
1762 ifp->flags &= ~IFA_F_DEPRECATED;
1763 spin_unlock(&ifp->lock);
1764
1765 if (!(flags&IFA_F_TENTATIVE))
1766 ipv6_ifa_notify(0, ifp);
1767 } else
1768 spin_unlock(&ifp->lock);
1769
1770 #ifdef CONFIG_IPV6_PRIVACY
1771 read_lock_bh(&in6_dev->lock);
1772 /* update all temporary addresses in the list */
1773 for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1774 /*
1775 * When adjusting the lifetimes of an existing
1776 * temporary address, only lower the lifetimes.
1777 * Implementations must not increase the
1778 * lifetimes of an existing temporary address
1779 * when processing a Prefix Information Option.
1780 */
1781 spin_lock(&ift->lock);
1782 flags = ift->flags;
1783 if (ift->valid_lft > valid_lft &&
1784 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1785 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1786 if (ift->prefered_lft > prefered_lft &&
1787 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1788 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1789 spin_unlock(&ift->lock);
1790 if (!(flags&IFA_F_TENTATIVE))
1791 ipv6_ifa_notify(0, ift);
1792 }
1793
1794 if (create && in6_dev->cnf.use_tempaddr > 0) {
1795 /*
1796 * When a new public address is created as described in [ADDRCONF],
1797 * also create a new temporary address.
1798 */
1799 read_unlock_bh(&in6_dev->lock);
1800 ipv6_create_tempaddr(ifp, NULL);
1801 } else {
1802 read_unlock_bh(&in6_dev->lock);
1803 }
1804 #endif
1805 in6_ifa_put(ifp);
1806 addrconf_verify(0);
1807 }
1808 }
1809 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
1810 in6_dev_put(in6_dev);
1811 }
1812
1813 /*
1814 * Set destination address.
1815 * Special case for SIT interfaces where we create a new "virtual"
1816 * device.
1817 */
1818 int addrconf_set_dstaddr(void __user *arg)
1819 {
1820 struct in6_ifreq ireq;
1821 struct net_device *dev;
1822 int err = -EINVAL;
1823
1824 rtnl_lock();
1825
1826 err = -EFAULT;
1827 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1828 goto err_exit;
1829
1830 dev = __dev_get_by_index(ireq.ifr6_ifindex);
1831
1832 err = -ENODEV;
1833 if (dev == NULL)
1834 goto err_exit;
1835
1836 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1837 if (dev->type == ARPHRD_SIT) {
1838 struct ifreq ifr;
1839 mm_segment_t oldfs;
1840 struct ip_tunnel_parm p;
1841
1842 err = -EADDRNOTAVAIL;
1843 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
1844 goto err_exit;
1845
1846 memset(&p, 0, sizeof(p));
1847 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
1848 p.iph.saddr = 0;
1849 p.iph.version = 4;
1850 p.iph.ihl = 5;
1851 p.iph.protocol = IPPROTO_IPV6;
1852 p.iph.ttl = 64;
1853 ifr.ifr_ifru.ifru_data = (void __user *)&p;
1854
1855 oldfs = get_fs(); set_fs(KERNEL_DS);
1856 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
1857 set_fs(oldfs);
1858
1859 if (err == 0) {
1860 err = -ENOBUFS;
1861 if ((dev = __dev_get_by_name(p.name)) == NULL)
1862 goto err_exit;
1863 err = dev_open(dev);
1864 }
1865 }
1866 #endif
1867
1868 err_exit:
1869 rtnl_unlock();
1870 return err;
1871 }
1872
1873 /*
1874 * Manual configuration of address on an interface
1875 */
1876 static int inet6_addr_add(int ifindex, struct in6_addr *pfx, int plen,
1877 __u8 ifa_flags, __u32 prefered_lft, __u32 valid_lft)
1878 {
1879 struct inet6_ifaddr *ifp;
1880 struct inet6_dev *idev;
1881 struct net_device *dev;
1882 int scope;
1883 u32 flags = RTF_EXPIRES;
1884
1885 ASSERT_RTNL();
1886
1887 /* check the lifetime */
1888 if (!valid_lft || prefered_lft > valid_lft)
1889 return -EINVAL;
1890
1891 if ((dev = __dev_get_by_index(ifindex)) == NULL)
1892 return -ENODEV;
1893
1894 if ((idev = addrconf_add_dev(dev)) == NULL)
1895 return -ENOBUFS;
1896
1897 scope = ipv6_addr_scope(pfx);
1898
1899 if (valid_lft == INFINITY_LIFE_TIME) {
1900 ifa_flags |= IFA_F_PERMANENT;
1901 flags = 0;
1902 } else if (valid_lft >= 0x7FFFFFFF/HZ)
1903 valid_lft = 0x7FFFFFFF/HZ;
1904
1905 if (prefered_lft == 0)
1906 ifa_flags |= IFA_F_DEPRECATED;
1907 else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
1908 (prefered_lft != INFINITY_LIFE_TIME))
1909 prefered_lft = 0x7FFFFFFF/HZ;
1910
1911 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
1912
1913 if (!IS_ERR(ifp)) {
1914 spin_lock_bh(&ifp->lock);
1915 ifp->valid_lft = valid_lft;
1916 ifp->prefered_lft = prefered_lft;
1917 ifp->tstamp = jiffies;
1918 spin_unlock_bh(&ifp->lock);
1919
1920 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
1921 jiffies_to_clock_t(valid_lft * HZ), flags);
1922 /*
1923 * Note that section 3.1 of RFC 4429 indicates
1924 * that the Optimistic flag should not be set for
1925 * manually configured addresses
1926 */
1927 addrconf_dad_start(ifp, 0);
1928 in6_ifa_put(ifp);
1929 addrconf_verify(0);
1930 return 0;
1931 }
1932
1933 return PTR_ERR(ifp);
1934 }
1935
1936 static int inet6_addr_del(int ifindex, struct in6_addr *pfx, int plen)
1937 {
1938 struct inet6_ifaddr *ifp;
1939 struct inet6_dev *idev;
1940 struct net_device *dev;
1941
1942 if ((dev = __dev_get_by_index(ifindex)) == NULL)
1943 return -ENODEV;
1944
1945 if ((idev = __in6_dev_get(dev)) == NULL)
1946 return -ENXIO;
1947
1948 read_lock_bh(&idev->lock);
1949 for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
1950 if (ifp->prefix_len == plen &&
1951 ipv6_addr_equal(pfx, &ifp->addr)) {
1952 in6_ifa_hold(ifp);
1953 read_unlock_bh(&idev->lock);
1954
1955 ipv6_del_addr(ifp);
1956
1957 /* If the last address is deleted administratively,
1958 disable IPv6 on this interface.
1959 */
1960 if (idev->addr_list == NULL)
1961 addrconf_ifdown(idev->dev, 1);
1962 return 0;
1963 }
1964 }
1965 read_unlock_bh(&idev->lock);
1966 return -EADDRNOTAVAIL;
1967 }
1968
1969
1970 int addrconf_add_ifaddr(void __user *arg)
1971 {
1972 struct in6_ifreq ireq;
1973 int err;
1974
1975 if (!capable(CAP_NET_ADMIN))
1976 return -EPERM;
1977
1978 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1979 return -EFAULT;
1980
1981 rtnl_lock();
1982 err = inet6_addr_add(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen,
1983 IFA_F_PERMANENT, INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1984 rtnl_unlock();
1985 return err;
1986 }
1987
1988 int addrconf_del_ifaddr(void __user *arg)
1989 {
1990 struct in6_ifreq ireq;
1991 int err;
1992
1993 if (!capable(CAP_NET_ADMIN))
1994 return -EPERM;
1995
1996 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1997 return -EFAULT;
1998
1999 rtnl_lock();
2000 err = inet6_addr_del(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
2001 rtnl_unlock();
2002 return err;
2003 }
2004
2005 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2006 static void sit_add_v4_addrs(struct inet6_dev *idev)
2007 {
2008 struct inet6_ifaddr * ifp;
2009 struct in6_addr addr;
2010 struct net_device *dev;
2011 int scope;
2012
2013 ASSERT_RTNL();
2014
2015 memset(&addr, 0, sizeof(struct in6_addr));
2016 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2017
2018 if (idev->dev->flags&IFF_POINTOPOINT) {
2019 addr.s6_addr32[0] = htonl(0xfe800000);
2020 scope = IFA_LINK;
2021 } else {
2022 scope = IPV6_ADDR_COMPATv4;
2023 }
2024
2025 if (addr.s6_addr32[3]) {
2026 ifp = ipv6_add_addr(idev, &addr, 128, scope, 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 return;
2035 }
2036
2037 for (dev = dev_base; dev != NULL; dev = dev->next) {
2038 struct in_device * in_dev = __in_dev_get_rtnl(dev);
2039 if (in_dev && (dev->flags & IFF_UP)) {
2040 struct in_ifaddr * ifa;
2041
2042 int flag = scope;
2043
2044 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2045 int plen;
2046
2047 addr.s6_addr32[3] = ifa->ifa_local;
2048
2049 if (ifa->ifa_scope == RT_SCOPE_LINK)
2050 continue;
2051 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2052 if (idev->dev->flags&IFF_POINTOPOINT)
2053 continue;
2054 flag |= IFA_HOST;
2055 }
2056 if (idev->dev->flags&IFF_POINTOPOINT)
2057 plen = 64;
2058 else
2059 plen = 96;
2060
2061 ifp = ipv6_add_addr(idev, &addr, plen, flag,
2062 IFA_F_PERMANENT);
2063 if (!IS_ERR(ifp)) {
2064 spin_lock_bh(&ifp->lock);
2065 ifp->flags &= ~IFA_F_TENTATIVE;
2066 spin_unlock_bh(&ifp->lock);
2067 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2068 in6_ifa_put(ifp);
2069 }
2070 }
2071 }
2072 }
2073 }
2074 #endif
2075
2076 static void init_loopback(struct net_device *dev)
2077 {
2078 struct inet6_dev *idev;
2079 struct inet6_ifaddr * ifp;
2080
2081 /* ::1 */
2082
2083 ASSERT_RTNL();
2084
2085 if ((idev = ipv6_find_idev(dev)) == NULL) {
2086 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2087 return;
2088 }
2089
2090 ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
2091 if (!IS_ERR(ifp)) {
2092 spin_lock_bh(&ifp->lock);
2093 ifp->flags &= ~IFA_F_TENTATIVE;
2094 spin_unlock_bh(&ifp->lock);
2095 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2096 in6_ifa_put(ifp);
2097 }
2098 }
2099
2100 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2101 {
2102 struct inet6_ifaddr * ifp;
2103 u32 addr_flags = IFA_F_PERMANENT;
2104
2105 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2106 if (idev->cnf.optimistic_dad &&
2107 !ipv6_devconf.forwarding)
2108 addr_flags |= IFA_F_OPTIMISTIC;
2109 #endif
2110
2111
2112 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2113 if (!IS_ERR(ifp)) {
2114 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2115 addrconf_dad_start(ifp, 0);
2116 in6_ifa_put(ifp);
2117 }
2118 }
2119
2120 static void addrconf_dev_config(struct net_device *dev)
2121 {
2122 struct in6_addr addr;
2123 struct inet6_dev * idev;
2124
2125 ASSERT_RTNL();
2126
2127 if ((dev->type != ARPHRD_ETHER) &&
2128 (dev->type != ARPHRD_FDDI) &&
2129 (dev->type != ARPHRD_IEEE802_TR) &&
2130 (dev->type != ARPHRD_ARCNET) &&
2131 (dev->type != ARPHRD_INFINIBAND)) {
2132 /* Alas, we support only Ethernet autoconfiguration. */
2133 return;
2134 }
2135
2136 idev = addrconf_add_dev(dev);
2137 if (idev == NULL)
2138 return;
2139
2140 memset(&addr, 0, sizeof(struct in6_addr));
2141 addr.s6_addr32[0] = htonl(0xFE800000);
2142
2143 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2144 addrconf_add_linklocal(idev, &addr);
2145 }
2146
2147 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2148 static void addrconf_sit_config(struct net_device *dev)
2149 {
2150 struct inet6_dev *idev;
2151
2152 ASSERT_RTNL();
2153
2154 /*
2155 * Configure the tunnel with one of our IPv4
2156 * addresses... we should configure all of
2157 * our v4 addrs in the tunnel
2158 */
2159
2160 if ((idev = ipv6_find_idev(dev)) == NULL) {
2161 printk(KERN_DEBUG "init sit: add_dev failed\n");
2162 return;
2163 }
2164
2165 sit_add_v4_addrs(idev);
2166
2167 if (dev->flags&IFF_POINTOPOINT) {
2168 addrconf_add_mroute(dev);
2169 addrconf_add_lroute(dev);
2170 } else
2171 sit_route_add(dev);
2172 }
2173 #endif
2174
2175 static inline int
2176 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2177 {
2178 struct in6_addr lladdr;
2179
2180 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2181 addrconf_add_linklocal(idev, &lladdr);
2182 return 0;
2183 }
2184 return -1;
2185 }
2186
2187 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2188 {
2189 struct net_device *link_dev;
2190
2191 /* first try to inherit the link-local address from the link device */
2192 if (idev->dev->iflink &&
2193 (link_dev = __dev_get_by_index(idev->dev->iflink))) {
2194 if (!ipv6_inherit_linklocal(idev, link_dev))
2195 return;
2196 }
2197 /* then try to inherit it from any device */
2198 for (link_dev = dev_base; link_dev; link_dev = link_dev->next) {
2199 if (!ipv6_inherit_linklocal(idev, link_dev))
2200 return;
2201 }
2202 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2203 }
2204
2205 /*
2206 * Autoconfigure tunnel with a link-local address so routing protocols,
2207 * DHCPv6, MLD etc. can be run over the virtual link
2208 */
2209
2210 static void addrconf_ip6_tnl_config(struct net_device *dev)
2211 {
2212 struct inet6_dev *idev;
2213
2214 ASSERT_RTNL();
2215
2216 if ((idev = addrconf_add_dev(dev)) == NULL) {
2217 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2218 return;
2219 }
2220 ip6_tnl_add_linklocal(idev);
2221 }
2222
2223 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2224 void * data)
2225 {
2226 struct net_device *dev = (struct net_device *) data;
2227 struct inet6_dev *idev = __in6_dev_get(dev);
2228 int run_pending = 0;
2229
2230 switch(event) {
2231 case NETDEV_REGISTER:
2232 if (!idev) {
2233 idev = ipv6_add_dev(dev);
2234 if (!idev)
2235 printk(KERN_WARNING "IPv6: add_dev failed for %s\n",
2236 dev->name);
2237 }
2238 break;
2239 case NETDEV_UP:
2240 case NETDEV_CHANGE:
2241 if (event == NETDEV_UP) {
2242 if (!netif_carrier_ok(dev)) {
2243 /* device is not ready yet. */
2244 printk(KERN_INFO
2245 "ADDRCONF(NETDEV_UP): %s: "
2246 "link is not ready\n",
2247 dev->name);
2248 break;
2249 }
2250
2251 if (idev)
2252 idev->if_flags |= IF_READY;
2253 } else {
2254 if (!netif_carrier_ok(dev)) {
2255 /* device is still not ready. */
2256 break;
2257 }
2258
2259 if (idev) {
2260 if (idev->if_flags & IF_READY) {
2261 /* device is already configured. */
2262 break;
2263 }
2264 idev->if_flags |= IF_READY;
2265 }
2266
2267 printk(KERN_INFO
2268 "ADDRCONF(NETDEV_CHANGE): %s: "
2269 "link becomes ready\n",
2270 dev->name);
2271
2272 run_pending = 1;
2273 }
2274
2275 switch(dev->type) {
2276 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2277 case ARPHRD_SIT:
2278 addrconf_sit_config(dev);
2279 break;
2280 #endif
2281 case ARPHRD_TUNNEL6:
2282 addrconf_ip6_tnl_config(dev);
2283 break;
2284 case ARPHRD_LOOPBACK:
2285 init_loopback(dev);
2286 break;
2287
2288 default:
2289 addrconf_dev_config(dev);
2290 break;
2291 };
2292 if (idev) {
2293 if (run_pending)
2294 addrconf_dad_run(idev);
2295
2296 /* If the MTU changed during the interface down, when the
2297 interface up, the changed MTU must be reflected in the
2298 idev as well as routers.
2299 */
2300 if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2301 rt6_mtu_change(dev, dev->mtu);
2302 idev->cnf.mtu6 = dev->mtu;
2303 }
2304 idev->tstamp = jiffies;
2305 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2306 /* If the changed mtu during down is lower than IPV6_MIN_MTU
2307 stop IPv6 on this interface.
2308 */
2309 if (dev->mtu < IPV6_MIN_MTU)
2310 addrconf_ifdown(dev, event != NETDEV_DOWN);
2311 }
2312 break;
2313
2314 case NETDEV_CHANGEMTU:
2315 if ( idev && dev->mtu >= IPV6_MIN_MTU) {
2316 rt6_mtu_change(dev, dev->mtu);
2317 idev->cnf.mtu6 = dev->mtu;
2318 break;
2319 }
2320
2321 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2322
2323 case NETDEV_DOWN:
2324 case NETDEV_UNREGISTER:
2325 /*
2326 * Remove all addresses from this interface.
2327 */
2328 addrconf_ifdown(dev, event != NETDEV_DOWN);
2329 break;
2330
2331 case NETDEV_CHANGENAME:
2332 #ifdef CONFIG_SYSCTL
2333 if (idev) {
2334 addrconf_sysctl_unregister(&idev->cnf);
2335 neigh_sysctl_unregister(idev->nd_parms);
2336 neigh_sysctl_register(dev, idev->nd_parms,
2337 NET_IPV6, NET_IPV6_NEIGH, "ipv6",
2338 &ndisc_ifinfo_sysctl_change,
2339 NULL);
2340 addrconf_sysctl_register(idev, &idev->cnf);
2341 }
2342 #endif
2343 break;
2344 };
2345
2346 return NOTIFY_OK;
2347 }
2348
2349 /*
2350 * addrconf module should be notified of a device going up
2351 */
2352 static struct notifier_block ipv6_dev_notf = {
2353 .notifier_call = addrconf_notify,
2354 .priority = 0
2355 };
2356
2357 static int addrconf_ifdown(struct net_device *dev, int how)
2358 {
2359 struct inet6_dev *idev;
2360 struct inet6_ifaddr *ifa, **bifa;
2361 int i;
2362
2363 ASSERT_RTNL();
2364
2365 if (dev == &loopback_dev && how == 1)
2366 how = 0;
2367
2368 rt6_ifdown(dev);
2369 neigh_ifdown(&nd_tbl, dev);
2370
2371 idev = __in6_dev_get(dev);
2372 if (idev == NULL)
2373 return -ENODEV;
2374
2375 /* Step 1: remove reference to ipv6 device from parent device.
2376 Do not dev_put!
2377 */
2378 if (how == 1) {
2379 idev->dead = 1;
2380
2381 /* protected by rtnl_lock */
2382 rcu_assign_pointer(dev->ip6_ptr, NULL);
2383
2384 /* Step 1.5: remove snmp6 entry */
2385 snmp6_unregister_dev(idev);
2386
2387 }
2388
2389 /* Step 2: clear hash table */
2390 for (i=0; i<IN6_ADDR_HSIZE; i++) {
2391 bifa = &inet6_addr_lst[i];
2392
2393 write_lock_bh(&addrconf_hash_lock);
2394 while ((ifa = *bifa) != NULL) {
2395 if (ifa->idev == idev) {
2396 *bifa = ifa->lst_next;
2397 ifa->lst_next = NULL;
2398 addrconf_del_timer(ifa);
2399 in6_ifa_put(ifa);
2400 continue;
2401 }
2402 bifa = &ifa->lst_next;
2403 }
2404 write_unlock_bh(&addrconf_hash_lock);
2405 }
2406
2407 write_lock_bh(&idev->lock);
2408
2409 /* Step 3: clear flags for stateless addrconf */
2410 if (how != 1)
2411 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2412
2413 /* Step 4: clear address list */
2414 #ifdef CONFIG_IPV6_PRIVACY
2415 if (how == 1 && del_timer(&idev->regen_timer))
2416 in6_dev_put(idev);
2417
2418 /* clear tempaddr list */
2419 while ((ifa = idev->tempaddr_list) != NULL) {
2420 idev->tempaddr_list = ifa->tmp_next;
2421 ifa->tmp_next = NULL;
2422 ifa->dead = 1;
2423 write_unlock_bh(&idev->lock);
2424 spin_lock_bh(&ifa->lock);
2425
2426 if (ifa->ifpub) {
2427 in6_ifa_put(ifa->ifpub);
2428 ifa->ifpub = NULL;
2429 }
2430 spin_unlock_bh(&ifa->lock);
2431 in6_ifa_put(ifa);
2432 write_lock_bh(&idev->lock);
2433 }
2434 #endif
2435 while ((ifa = idev->addr_list) != NULL) {
2436 idev->addr_list = ifa->if_next;
2437 ifa->if_next = NULL;
2438 ifa->dead = 1;
2439 addrconf_del_timer(ifa);
2440 write_unlock_bh(&idev->lock);
2441
2442 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2443 in6_ifa_put(ifa);
2444
2445 write_lock_bh(&idev->lock);
2446 }
2447 write_unlock_bh(&idev->lock);
2448
2449 /* Step 5: Discard multicast list */
2450
2451 if (how == 1)
2452 ipv6_mc_destroy_dev(idev);
2453 else
2454 ipv6_mc_down(idev);
2455
2456 /* Step 5: netlink notification of this interface */
2457 idev->tstamp = jiffies;
2458 inet6_ifinfo_notify(RTM_DELLINK, idev);
2459
2460 /* Shot the device (if unregistered) */
2461
2462 if (how == 1) {
2463 #ifdef CONFIG_SYSCTL
2464 addrconf_sysctl_unregister(&idev->cnf);
2465 neigh_sysctl_unregister(idev->nd_parms);
2466 #endif
2467 neigh_parms_release(&nd_tbl, idev->nd_parms);
2468 neigh_ifdown(&nd_tbl, dev);
2469 in6_dev_put(idev);
2470 }
2471 return 0;
2472 }
2473
2474 static void addrconf_rs_timer(unsigned long data)
2475 {
2476 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2477
2478 if (ifp->idev->cnf.forwarding)
2479 goto out;
2480
2481 if (ifp->idev->if_flags & IF_RA_RCVD) {
2482 /*
2483 * Announcement received after solicitation
2484 * was sent
2485 */
2486 goto out;
2487 }
2488
2489 spin_lock(&ifp->lock);
2490 if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2491 struct in6_addr all_routers;
2492
2493 /* The wait after the last probe can be shorter */
2494 addrconf_mod_timer(ifp, AC_RS,
2495 (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2496 ifp->idev->cnf.rtr_solicit_delay :
2497 ifp->idev->cnf.rtr_solicit_interval);
2498 spin_unlock(&ifp->lock);
2499
2500 ipv6_addr_all_routers(&all_routers);
2501
2502 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2503 } else {
2504 spin_unlock(&ifp->lock);
2505 /*
2506 * Note: we do not support deprecated "all on-link"
2507 * assumption any longer.
2508 */
2509 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2510 ifp->idev->dev->name);
2511 }
2512
2513 out:
2514 in6_ifa_put(ifp);
2515 }
2516
2517 /*
2518 * Duplicate Address Detection
2519 */
2520 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2521 {
2522 unsigned long rand_num;
2523 struct inet6_dev *idev = ifp->idev;
2524
2525 if (ifp->flags & IFA_F_OPTIMISTIC)
2526 rand_num = 0;
2527 else
2528 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2529
2530 ifp->probes = idev->cnf.dad_transmits;
2531 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2532 }
2533
2534 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2535 {
2536 struct inet6_dev *idev = ifp->idev;
2537 struct net_device *dev = idev->dev;
2538
2539 addrconf_join_solict(dev, &ifp->addr);
2540
2541 net_srandom(ifp->addr.s6_addr32[3]);
2542
2543 read_lock_bh(&idev->lock);
2544 if (ifp->dead)
2545 goto out;
2546 spin_lock_bh(&ifp->lock);
2547
2548 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2549 !(ifp->flags&IFA_F_TENTATIVE) ||
2550 ifp->flags & IFA_F_NODAD) {
2551 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
2552 spin_unlock_bh(&ifp->lock);
2553 read_unlock_bh(&idev->lock);
2554
2555 addrconf_dad_completed(ifp);
2556 return;
2557 }
2558
2559 if (!(idev->if_flags & IF_READY)) {
2560 spin_unlock_bh(&ifp->lock);
2561 read_unlock_bh(&idev->lock);
2562 /*
2563 * If the defice is not ready:
2564 * - keep it tentative if it is a permanent address.
2565 * - otherwise, kill it.
2566 */
2567 in6_ifa_hold(ifp);
2568 addrconf_dad_stop(ifp);
2569 return;
2570 }
2571
2572 /*
2573 * Optimistic nodes can start receiving
2574 * Frames right away
2575 */
2576 if(ifp->flags & IFA_F_OPTIMISTIC)
2577 ip6_ins_rt(ifp->rt);
2578
2579 addrconf_dad_kick(ifp);
2580 spin_unlock_bh(&ifp->lock);
2581 out:
2582 read_unlock_bh(&idev->lock);
2583 }
2584
2585 static void addrconf_dad_timer(unsigned long data)
2586 {
2587 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2588 struct inet6_dev *idev = ifp->idev;
2589 struct in6_addr unspec;
2590 struct in6_addr mcaddr;
2591
2592 read_lock_bh(&idev->lock);
2593 if (idev->dead) {
2594 read_unlock_bh(&idev->lock);
2595 goto out;
2596 }
2597 spin_lock_bh(&ifp->lock);
2598 if (ifp->probes == 0) {
2599 /*
2600 * DAD was successful
2601 */
2602
2603 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
2604 spin_unlock_bh(&ifp->lock);
2605 read_unlock_bh(&idev->lock);
2606
2607 addrconf_dad_completed(ifp);
2608
2609 goto out;
2610 }
2611
2612 ifp->probes--;
2613 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2614 spin_unlock_bh(&ifp->lock);
2615 read_unlock_bh(&idev->lock);
2616
2617 /* send a neighbour solicitation for our addr */
2618 memset(&unspec, 0, sizeof(unspec));
2619 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2620 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec);
2621 out:
2622 in6_ifa_put(ifp);
2623 }
2624
2625 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2626 {
2627 struct net_device * dev = ifp->idev->dev;
2628
2629 /*
2630 * Configure the address for reception. Now it is valid.
2631 */
2632
2633 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2634
2635 /* If added prefix is link local and forwarding is off,
2636 start sending router solicitations.
2637 */
2638
2639 if (ifp->idev->cnf.forwarding == 0 &&
2640 ifp->idev->cnf.rtr_solicits > 0 &&
2641 (dev->flags&IFF_LOOPBACK) == 0 &&
2642 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2643 struct in6_addr all_routers;
2644
2645 ipv6_addr_all_routers(&all_routers);
2646
2647 /*
2648 * If a host as already performed a random delay
2649 * [...] as part of DAD [...] there is no need
2650 * to delay again before sending the first RS
2651 */
2652 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2653
2654 spin_lock_bh(&ifp->lock);
2655 ifp->probes = 1;
2656 ifp->idev->if_flags |= IF_RS_SENT;
2657 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2658 spin_unlock_bh(&ifp->lock);
2659 }
2660 }
2661
2662 static void addrconf_dad_run(struct inet6_dev *idev) {
2663 struct inet6_ifaddr *ifp;
2664
2665 read_lock_bh(&idev->lock);
2666 for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2667 spin_lock_bh(&ifp->lock);
2668 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2669 spin_unlock_bh(&ifp->lock);
2670 continue;
2671 }
2672 spin_unlock_bh(&ifp->lock);
2673 addrconf_dad_kick(ifp);
2674 }
2675 read_unlock_bh(&idev->lock);
2676 }
2677
2678 #ifdef CONFIG_PROC_FS
2679 struct if6_iter_state {
2680 int bucket;
2681 };
2682
2683 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2684 {
2685 struct inet6_ifaddr *ifa = NULL;
2686 struct if6_iter_state *state = seq->private;
2687
2688 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2689 ifa = inet6_addr_lst[state->bucket];
2690 if (ifa)
2691 break;
2692 }
2693 return ifa;
2694 }
2695
2696 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2697 {
2698 struct if6_iter_state *state = seq->private;
2699
2700 ifa = ifa->lst_next;
2701 try_again:
2702 if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2703 ifa = inet6_addr_lst[state->bucket];
2704 goto try_again;
2705 }
2706 return ifa;
2707 }
2708
2709 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2710 {
2711 struct inet6_ifaddr *ifa = if6_get_first(seq);
2712
2713 if (ifa)
2714 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2715 --pos;
2716 return pos ? NULL : ifa;
2717 }
2718
2719 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2720 {
2721 read_lock_bh(&addrconf_hash_lock);
2722 return if6_get_idx(seq, *pos);
2723 }
2724
2725 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2726 {
2727 struct inet6_ifaddr *ifa;
2728
2729 ifa = if6_get_next(seq, v);
2730 ++*pos;
2731 return ifa;
2732 }
2733
2734 static void if6_seq_stop(struct seq_file *seq, void *v)
2735 {
2736 read_unlock_bh(&addrconf_hash_lock);
2737 }
2738
2739 static int if6_seq_show(struct seq_file *seq, void *v)
2740 {
2741 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2742 seq_printf(seq,
2743 NIP6_SEQFMT " %02x %02x %02x %02x %8s\n",
2744 NIP6(ifp->addr),
2745 ifp->idev->dev->ifindex,
2746 ifp->prefix_len,
2747 ifp->scope,
2748 ifp->flags,
2749 ifp->idev->dev->name);
2750 return 0;
2751 }
2752
2753 static struct seq_operations if6_seq_ops = {
2754 .start = if6_seq_start,
2755 .next = if6_seq_next,
2756 .show = if6_seq_show,
2757 .stop = if6_seq_stop,
2758 };
2759
2760 static int if6_seq_open(struct inode *inode, struct file *file)
2761 {
2762 struct seq_file *seq;
2763 int rc = -ENOMEM;
2764 struct if6_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL);
2765
2766 if (!s)
2767 goto out;
2768
2769 rc = seq_open(file, &if6_seq_ops);
2770 if (rc)
2771 goto out_kfree;
2772
2773 seq = file->private_data;
2774 seq->private = s;
2775 out:
2776 return rc;
2777 out_kfree:
2778 kfree(s);
2779 goto out;
2780 }
2781
2782 static const struct file_operations if6_fops = {
2783 .owner = THIS_MODULE,
2784 .open = if6_seq_open,
2785 .read = seq_read,
2786 .llseek = seq_lseek,
2787 .release = seq_release_private,
2788 };
2789
2790 int __init if6_proc_init(void)
2791 {
2792 if (!proc_net_fops_create("if_inet6", S_IRUGO, &if6_fops))
2793 return -ENOMEM;
2794 return 0;
2795 }
2796
2797 void if6_proc_exit(void)
2798 {
2799 proc_net_remove("if_inet6");
2800 }
2801 #endif /* CONFIG_PROC_FS */
2802
2803 #ifdef CONFIG_IPV6_MIP6
2804 /* Check if address is a home address configured on any interface. */
2805 int ipv6_chk_home_addr(struct in6_addr *addr)
2806 {
2807 int ret = 0;
2808 struct inet6_ifaddr * ifp;
2809 u8 hash = ipv6_addr_hash(addr);
2810 read_lock_bh(&addrconf_hash_lock);
2811 for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) {
2812 if (ipv6_addr_cmp(&ifp->addr, addr) == 0 &&
2813 (ifp->flags & IFA_F_HOMEADDRESS)) {
2814 ret = 1;
2815 break;
2816 }
2817 }
2818 read_unlock_bh(&addrconf_hash_lock);
2819 return ret;
2820 }
2821 #endif
2822
2823 /*
2824 * Periodic address status verification
2825 */
2826
2827 static void addrconf_verify(unsigned long foo)
2828 {
2829 struct inet6_ifaddr *ifp;
2830 unsigned long now, next;
2831 int i;
2832
2833 spin_lock_bh(&addrconf_verify_lock);
2834 now = jiffies;
2835 next = now + ADDR_CHECK_FREQUENCY;
2836
2837 del_timer(&addr_chk_timer);
2838
2839 for (i=0; i < IN6_ADDR_HSIZE; i++) {
2840
2841 restart:
2842 read_lock(&addrconf_hash_lock);
2843 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
2844 unsigned long age;
2845 #ifdef CONFIG_IPV6_PRIVACY
2846 unsigned long regen_advance;
2847 #endif
2848
2849 if (ifp->flags & IFA_F_PERMANENT)
2850 continue;
2851
2852 spin_lock(&ifp->lock);
2853 age = (now - ifp->tstamp) / HZ;
2854
2855 #ifdef CONFIG_IPV6_PRIVACY
2856 regen_advance = ifp->idev->cnf.regen_max_retry *
2857 ifp->idev->cnf.dad_transmits *
2858 ifp->idev->nd_parms->retrans_time / HZ;
2859 #endif
2860
2861 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
2862 age >= ifp->valid_lft) {
2863 spin_unlock(&ifp->lock);
2864 in6_ifa_hold(ifp);
2865 read_unlock(&addrconf_hash_lock);
2866 ipv6_del_addr(ifp);
2867 goto restart;
2868 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
2869 spin_unlock(&ifp->lock);
2870 continue;
2871 } else if (age >= ifp->prefered_lft) {
2872 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
2873 int deprecate = 0;
2874
2875 if (!(ifp->flags&IFA_F_DEPRECATED)) {
2876 deprecate = 1;
2877 ifp->flags |= IFA_F_DEPRECATED;
2878 }
2879
2880 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
2881 next = ifp->tstamp + ifp->valid_lft * HZ;
2882
2883 spin_unlock(&ifp->lock);
2884
2885 if (deprecate) {
2886 in6_ifa_hold(ifp);
2887 read_unlock(&addrconf_hash_lock);
2888
2889 ipv6_ifa_notify(0, ifp);
2890 in6_ifa_put(ifp);
2891 goto restart;
2892 }
2893 #ifdef CONFIG_IPV6_PRIVACY
2894 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
2895 !(ifp->flags&IFA_F_TENTATIVE)) {
2896 if (age >= ifp->prefered_lft - regen_advance) {
2897 struct inet6_ifaddr *ifpub = ifp->ifpub;
2898 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2899 next = ifp->tstamp + ifp->prefered_lft * HZ;
2900 if (!ifp->regen_count && ifpub) {
2901 ifp->regen_count++;
2902 in6_ifa_hold(ifp);
2903 in6_ifa_hold(ifpub);
2904 spin_unlock(&ifp->lock);
2905 read_unlock(&addrconf_hash_lock);
2906 spin_lock(&ifpub->lock);
2907 ifpub->regen_count = 0;
2908 spin_unlock(&ifpub->lock);
2909 ipv6_create_tempaddr(ifpub, ifp);
2910 in6_ifa_put(ifpub);
2911 in6_ifa_put(ifp);
2912 goto restart;
2913 }
2914 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
2915 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
2916 spin_unlock(&ifp->lock);
2917 #endif
2918 } else {
2919 /* ifp->prefered_lft <= ifp->valid_lft */
2920 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2921 next = ifp->tstamp + ifp->prefered_lft * HZ;
2922 spin_unlock(&ifp->lock);
2923 }
2924 }
2925 read_unlock(&addrconf_hash_lock);
2926 }
2927
2928 addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
2929 add_timer(&addr_chk_timer);
2930 spin_unlock_bh(&addrconf_verify_lock);
2931 }
2932
2933 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
2934 {
2935 struct in6_addr *pfx = NULL;
2936
2937 if (addr)
2938 pfx = nla_data(addr);
2939
2940 if (local) {
2941 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
2942 pfx = NULL;
2943 else
2944 pfx = nla_data(local);
2945 }
2946
2947 return pfx;
2948 }
2949
2950 static struct nla_policy ifa_ipv6_policy[IFA_MAX+1] __read_mostly = {
2951 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
2952 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
2953 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
2954 };
2955
2956 static int
2957 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
2958 {
2959 struct ifaddrmsg *ifm;
2960 struct nlattr *tb[IFA_MAX+1];
2961 struct in6_addr *pfx;
2962 int err;
2963
2964 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
2965 if (err < 0)
2966 return err;
2967
2968 ifm = nlmsg_data(nlh);
2969 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
2970 if (pfx == NULL)
2971 return -EINVAL;
2972
2973 return inet6_addr_del(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
2974 }
2975
2976 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
2977 u32 prefered_lft, u32 valid_lft)
2978 {
2979 u32 flags = RTF_EXPIRES;
2980
2981 if (!valid_lft || (prefered_lft > valid_lft))
2982 return -EINVAL;
2983
2984 if (valid_lft == INFINITY_LIFE_TIME) {
2985 ifa_flags |= IFA_F_PERMANENT;
2986 flags = 0;
2987 } else if (valid_lft >= 0x7FFFFFFF/HZ)
2988 valid_lft = 0x7FFFFFFF/HZ;
2989
2990 if (prefered_lft == 0)
2991 ifa_flags |= IFA_F_DEPRECATED;
2992 else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
2993 (prefered_lft != INFINITY_LIFE_TIME))
2994 prefered_lft = 0x7FFFFFFF/HZ;
2995
2996 spin_lock_bh(&ifp->lock);
2997 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
2998 ifp->tstamp = jiffies;
2999 ifp->valid_lft = valid_lft;
3000 ifp->prefered_lft = prefered_lft;
3001
3002 spin_unlock_bh(&ifp->lock);
3003 if (!(ifp->flags&IFA_F_TENTATIVE))
3004 ipv6_ifa_notify(0, ifp);
3005
3006 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3007 jiffies_to_clock_t(valid_lft * HZ), flags);
3008 addrconf_verify(0);
3009
3010 return 0;
3011 }
3012
3013 static int
3014 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3015 {
3016 struct ifaddrmsg *ifm;
3017 struct nlattr *tb[IFA_MAX+1];
3018 struct in6_addr *pfx;
3019 struct inet6_ifaddr *ifa;
3020 struct net_device *dev;
3021 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3022 u8 ifa_flags;
3023 int err;
3024
3025 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3026 if (err < 0)
3027 return err;
3028
3029 ifm = nlmsg_data(nlh);
3030 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3031 if (pfx == NULL)
3032 return -EINVAL;
3033
3034 if (tb[IFA_CACHEINFO]) {
3035 struct ifa_cacheinfo *ci;
3036
3037 ci = nla_data(tb[IFA_CACHEINFO]);
3038 valid_lft = ci->ifa_valid;
3039 preferred_lft = ci->ifa_prefered;
3040 } else {
3041 preferred_lft = INFINITY_LIFE_TIME;
3042 valid_lft = INFINITY_LIFE_TIME;
3043 }
3044
3045 dev = __dev_get_by_index(ifm->ifa_index);
3046 if (dev == NULL)
3047 return -ENODEV;
3048
3049 /* We ignore other flags so far. */
3050 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3051
3052 ifa = ipv6_get_ifaddr(pfx, dev, 1);
3053 if (ifa == NULL) {
3054 /*
3055 * It would be best to check for !NLM_F_CREATE here but
3056 * userspace alreay relies on not having to provide this.
3057 */
3058 return inet6_addr_add(ifm->ifa_index, pfx, ifm->ifa_prefixlen,
3059 ifa_flags, preferred_lft, valid_lft);
3060 }
3061
3062 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3063 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3064 err = -EEXIST;
3065 else
3066 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3067
3068 in6_ifa_put(ifa);
3069
3070 return err;
3071 }
3072
3073 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3074 u8 scope, int ifindex)
3075 {
3076 struct ifaddrmsg *ifm;
3077
3078 ifm = nlmsg_data(nlh);
3079 ifm->ifa_family = AF_INET6;
3080 ifm->ifa_prefixlen = prefixlen;
3081 ifm->ifa_flags = flags;
3082 ifm->ifa_scope = scope;
3083 ifm->ifa_index = ifindex;
3084 }
3085
3086 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3087 unsigned long tstamp, u32 preferred, u32 valid)
3088 {
3089 struct ifa_cacheinfo ci;
3090
3091 ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3092 + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3093 ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3094 + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3095 ci.ifa_prefered = preferred;
3096 ci.ifa_valid = valid;
3097
3098 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3099 }
3100
3101 static inline int rt_scope(int ifa_scope)
3102 {
3103 if (ifa_scope & IFA_HOST)
3104 return RT_SCOPE_HOST;
3105 else if (ifa_scope & IFA_LINK)
3106 return RT_SCOPE_LINK;
3107 else if (ifa_scope & IFA_SITE)
3108 return RT_SCOPE_SITE;
3109 else
3110 return RT_SCOPE_UNIVERSE;
3111 }
3112
3113 static inline int inet6_ifaddr_msgsize(void)
3114 {
3115 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3116 + nla_total_size(16) /* IFA_ADDRESS */
3117 + nla_total_size(sizeof(struct ifa_cacheinfo));
3118 }
3119
3120 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3121 u32 pid, u32 seq, int event, unsigned int flags)
3122 {
3123 struct nlmsghdr *nlh;
3124 u32 preferred, valid;
3125
3126 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3127 if (nlh == NULL)
3128 return -EMSGSIZE;
3129
3130 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3131 ifa->idev->dev->ifindex);
3132
3133 if (!(ifa->flags&IFA_F_PERMANENT)) {
3134 preferred = ifa->prefered_lft;
3135 valid = ifa->valid_lft;
3136 if (preferred != INFINITY_LIFE_TIME) {
3137 long tval = (jiffies - ifa->tstamp)/HZ;
3138 preferred -= tval;
3139 if (valid != INFINITY_LIFE_TIME)
3140 valid -= tval;
3141 }
3142 } else {
3143 preferred = INFINITY_LIFE_TIME;
3144 valid = INFINITY_LIFE_TIME;
3145 }
3146
3147 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3148 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3149 nlmsg_cancel(skb, nlh);
3150 return -EMSGSIZE;
3151 }
3152
3153 return nlmsg_end(skb, nlh);
3154 }
3155
3156 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3157 u32 pid, u32 seq, int event, u16 flags)
3158 {
3159 struct nlmsghdr *nlh;
3160 u8 scope = RT_SCOPE_UNIVERSE;
3161 int ifindex = ifmca->idev->dev->ifindex;
3162
3163 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3164 scope = RT_SCOPE_SITE;
3165
3166 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3167 if (nlh == NULL)
3168 return -EMSGSIZE;
3169
3170 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3171 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3172 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3173 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3174 nlmsg_cancel(skb, nlh);
3175 return -EMSGSIZE;
3176 }
3177
3178 return nlmsg_end(skb, nlh);
3179 }
3180
3181 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3182 u32 pid, u32 seq, int event, unsigned int flags)
3183 {
3184 struct nlmsghdr *nlh;
3185 u8 scope = RT_SCOPE_UNIVERSE;
3186 int ifindex = ifaca->aca_idev->dev->ifindex;
3187
3188 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3189 scope = RT_SCOPE_SITE;
3190
3191 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3192 if (nlh == NULL)
3193 return -EMSGSIZE;
3194
3195 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3196 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3197 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3198 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3199 nlmsg_cancel(skb, nlh);
3200 return -EMSGSIZE;
3201 }
3202
3203 return nlmsg_end(skb, nlh);
3204 }
3205
3206 enum addr_type_t
3207 {
3208 UNICAST_ADDR,
3209 MULTICAST_ADDR,
3210 ANYCAST_ADDR,
3211 };
3212
3213 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3214 enum addr_type_t type)
3215 {
3216 int idx, ip_idx;
3217 int s_idx, s_ip_idx;
3218 int err = 1;
3219 struct net_device *dev;
3220 struct inet6_dev *idev = NULL;
3221 struct inet6_ifaddr *ifa;
3222 struct ifmcaddr6 *ifmca;
3223 struct ifacaddr6 *ifaca;
3224
3225 s_idx = cb->args[0];
3226 s_ip_idx = ip_idx = cb->args[1];
3227 read_lock(&dev_base_lock);
3228
3229 for (dev = dev_base, idx = 0; dev; dev = dev->next, idx++) {
3230 if (idx < s_idx)
3231 continue;
3232 if (idx > s_idx)
3233 s_ip_idx = 0;
3234 ip_idx = 0;
3235 if ((idev = in6_dev_get(dev)) == NULL)
3236 continue;
3237 read_lock_bh(&idev->lock);
3238 switch (type) {
3239 case UNICAST_ADDR:
3240 /* unicast address incl. temp addr */
3241 for (ifa = idev->addr_list; ifa;
3242 ifa = ifa->if_next, ip_idx++) {
3243 if (ip_idx < s_ip_idx)
3244 continue;
3245 if ((err = inet6_fill_ifaddr(skb, ifa,
3246 NETLINK_CB(cb->skb).pid,
3247 cb->nlh->nlmsg_seq, RTM_NEWADDR,
3248 NLM_F_MULTI)) <= 0)
3249 goto done;
3250 }
3251 break;
3252 case MULTICAST_ADDR:
3253 /* multicast address */
3254 for (ifmca = idev->mc_list; ifmca;
3255 ifmca = ifmca->next, ip_idx++) {
3256 if (ip_idx < s_ip_idx)
3257 continue;
3258 if ((err = inet6_fill_ifmcaddr(skb, ifmca,
3259 NETLINK_CB(cb->skb).pid,
3260 cb->nlh->nlmsg_seq, RTM_GETMULTICAST,
3261 NLM_F_MULTI)) <= 0)
3262 goto done;
3263 }
3264 break;
3265 case ANYCAST_ADDR:
3266 /* anycast address */
3267 for (ifaca = idev->ac_list; ifaca;
3268 ifaca = ifaca->aca_next, ip_idx++) {
3269 if (ip_idx < s_ip_idx)
3270 continue;
3271 if ((err = inet6_fill_ifacaddr(skb, ifaca,
3272 NETLINK_CB(cb->skb).pid,
3273 cb->nlh->nlmsg_seq, RTM_GETANYCAST,
3274 NLM_F_MULTI)) <= 0)
3275 goto done;
3276 }
3277 break;
3278 default:
3279 break;
3280 }
3281 read_unlock_bh(&idev->lock);
3282 in6_dev_put(idev);
3283 }
3284 done:
3285 if (err <= 0) {
3286 read_unlock_bh(&idev->lock);
3287 in6_dev_put(idev);
3288 }
3289 read_unlock(&dev_base_lock);
3290 cb->args[0] = idx;
3291 cb->args[1] = ip_idx;
3292 return skb->len;
3293 }
3294
3295 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3296 {
3297 enum addr_type_t type = UNICAST_ADDR;
3298 return inet6_dump_addr(skb, cb, type);
3299 }
3300
3301 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3302 {
3303 enum addr_type_t type = MULTICAST_ADDR;
3304 return inet6_dump_addr(skb, cb, type);
3305 }
3306
3307
3308 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3309 {
3310 enum addr_type_t type = ANYCAST_ADDR;
3311 return inet6_dump_addr(skb, cb, type);
3312 }
3313
3314 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3315 void *arg)
3316 {
3317 struct ifaddrmsg *ifm;
3318 struct nlattr *tb[IFA_MAX+1];
3319 struct in6_addr *addr = NULL;
3320 struct net_device *dev = NULL;
3321 struct inet6_ifaddr *ifa;
3322 struct sk_buff *skb;
3323 int err;
3324
3325 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3326 if (err < 0)
3327 goto errout;
3328
3329 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3330 if (addr == NULL) {
3331 err = -EINVAL;
3332 goto errout;
3333 }
3334
3335 ifm = nlmsg_data(nlh);
3336 if (ifm->ifa_index)
3337 dev = __dev_get_by_index(ifm->ifa_index);
3338
3339 if ((ifa = ipv6_get_ifaddr(addr, dev, 1)) == NULL) {
3340 err = -EADDRNOTAVAIL;
3341 goto errout;
3342 }
3343
3344 if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) {
3345 err = -ENOBUFS;
3346 goto errout_ifa;
3347 }
3348
3349 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3350 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3351 if (err < 0) {
3352 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3353 WARN_ON(err == -EMSGSIZE);
3354 kfree_skb(skb);
3355 goto errout_ifa;
3356 }
3357 err = rtnl_unicast(skb, NETLINK_CB(in_skb).pid);
3358 errout_ifa:
3359 in6_ifa_put(ifa);
3360 errout:
3361 return err;
3362 }
3363
3364 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3365 {
3366 struct sk_buff *skb;
3367 int err = -ENOBUFS;
3368
3369 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3370 if (skb == NULL)
3371 goto errout;
3372
3373 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3374 if (err < 0) {
3375 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3376 WARN_ON(err == -EMSGSIZE);
3377 kfree_skb(skb);
3378 goto errout;
3379 }
3380 err = rtnl_notify(skb, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3381 errout:
3382 if (err < 0)
3383 rtnl_set_sk_err(RTNLGRP_IPV6_IFADDR, err);
3384 }
3385
3386 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3387 __s32 *array, int bytes)
3388 {
3389 BUG_ON(bytes < (DEVCONF_MAX * 4));
3390
3391 memset(array, 0, bytes);
3392 array[DEVCONF_FORWARDING] = cnf->forwarding;
3393 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3394 array[DEVCONF_MTU6] = cnf->mtu6;
3395 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3396 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3397 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3398 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3399 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3400 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3401 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3402 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3403 #ifdef CONFIG_IPV6_PRIVACY
3404 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3405 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3406 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3407 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3408 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3409 #endif
3410 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3411 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3412 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3413 #ifdef CONFIG_IPV6_ROUTER_PREF
3414 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3415 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
3416 #ifdef CONFIG_IPV6_ROUTE_INFO
3417 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3418 #endif
3419 #endif
3420 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3421 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3422 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3423 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3424 #endif
3425 }
3426
3427 static inline size_t inet6_if_nlmsg_size(void)
3428 {
3429 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3430 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3431 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3432 + nla_total_size(4) /* IFLA_MTU */
3433 + nla_total_size(4) /* IFLA_LINK */
3434 + nla_total_size( /* IFLA_PROTINFO */
3435 nla_total_size(4) /* IFLA_INET6_FLAGS */
3436 + nla_total_size(sizeof(struct ifla_cacheinfo))
3437 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3438 );
3439 }
3440
3441 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3442 u32 pid, u32 seq, int event, unsigned int flags)
3443 {
3444 struct net_device *dev = idev->dev;
3445 struct nlattr *conf;
3446 struct ifinfomsg *hdr;
3447 struct nlmsghdr *nlh;
3448 void *protoinfo;
3449 struct ifla_cacheinfo ci;
3450
3451 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3452 if (nlh == NULL)
3453 return -EMSGSIZE;
3454
3455 hdr = nlmsg_data(nlh);
3456 hdr->ifi_family = AF_INET6;
3457 hdr->__ifi_pad = 0;
3458 hdr->ifi_type = dev->type;
3459 hdr->ifi_index = dev->ifindex;
3460 hdr->ifi_flags = dev_get_flags(dev);
3461 hdr->ifi_change = 0;
3462
3463 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
3464
3465 if (dev->addr_len)
3466 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3467
3468 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
3469 if (dev->ifindex != dev->iflink)
3470 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
3471
3472 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3473 if (protoinfo == NULL)
3474 goto nla_put_failure;
3475
3476 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
3477
3478 ci.max_reasm_len = IPV6_MAXPLEN;
3479 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3480 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3481 ci.reachable_time = idev->nd_parms->reachable_time;
3482 ci.retrans_time = idev->nd_parms->retrans_time;
3483 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3484
3485 conf = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3486 if (conf == NULL)
3487 goto nla_put_failure;
3488 ipv6_store_devconf(&idev->cnf, nla_data(conf), nla_len(conf));
3489
3490 /* XXX - Statistics/MC not implemented */
3491
3492 nla_nest_end(skb, protoinfo);
3493 return nlmsg_end(skb, nlh);
3494
3495 nla_put_failure:
3496 nlmsg_cancel(skb, nlh);
3497 return -EMSGSIZE;
3498 }
3499
3500 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3501 {
3502 int idx, err;
3503 int s_idx = cb->args[0];
3504 struct net_device *dev;
3505 struct inet6_dev *idev;
3506
3507 read_lock(&dev_base_lock);
3508 for (dev=dev_base, idx=0; dev; dev = dev->next, idx++) {
3509 if (idx < s_idx)
3510 continue;
3511 if ((idev = in6_dev_get(dev)) == NULL)
3512 continue;
3513 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
3514 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
3515 in6_dev_put(idev);
3516 if (err <= 0)
3517 break;
3518 }
3519 read_unlock(&dev_base_lock);
3520 cb->args[0] = idx;
3521
3522 return skb->len;
3523 }
3524
3525 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3526 {
3527 struct sk_buff *skb;
3528 int err = -ENOBUFS;
3529
3530 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
3531 if (skb == NULL)
3532 goto errout;
3533
3534 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
3535 if (err < 0) {
3536 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3537 WARN_ON(err == -EMSGSIZE);
3538 kfree_skb(skb);
3539 goto errout;
3540 }
3541 err = rtnl_notify(skb, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3542 errout:
3543 if (err < 0)
3544 rtnl_set_sk_err(RTNLGRP_IPV6_IFADDR, err);
3545 }
3546
3547 static inline size_t inet6_prefix_nlmsg_size(void)
3548 {
3549 return NLMSG_ALIGN(sizeof(struct prefixmsg))
3550 + nla_total_size(sizeof(struct in6_addr))
3551 + nla_total_size(sizeof(struct prefix_cacheinfo));
3552 }
3553
3554 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
3555 struct prefix_info *pinfo, u32 pid, u32 seq,
3556 int event, unsigned int flags)
3557 {
3558 struct prefixmsg *pmsg;
3559 struct nlmsghdr *nlh;
3560 struct prefix_cacheinfo ci;
3561
3562 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
3563 if (nlh == NULL)
3564 return -EMSGSIZE;
3565
3566 pmsg = nlmsg_data(nlh);
3567 pmsg->prefix_family = AF_INET6;
3568 pmsg->prefix_pad1 = 0;
3569 pmsg->prefix_pad2 = 0;
3570 pmsg->prefix_ifindex = idev->dev->ifindex;
3571 pmsg->prefix_len = pinfo->prefix_len;
3572 pmsg->prefix_type = pinfo->type;
3573 pmsg->prefix_pad3 = 0;
3574 pmsg->prefix_flags = 0;
3575 if (pinfo->onlink)
3576 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3577 if (pinfo->autoconf)
3578 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3579
3580 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
3581
3582 ci.preferred_time = ntohl(pinfo->prefered);
3583 ci.valid_time = ntohl(pinfo->valid);
3584 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
3585
3586 return nlmsg_end(skb, nlh);
3587
3588 nla_put_failure:
3589 nlmsg_cancel(skb, nlh);
3590 return -EMSGSIZE;
3591 }
3592
3593 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
3594 struct prefix_info *pinfo)
3595 {
3596 struct sk_buff *skb;
3597 int err = -ENOBUFS;
3598
3599 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
3600 if (skb == NULL)
3601 goto errout;
3602
3603 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
3604 if (err < 0) {
3605 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
3606 WARN_ON(err == -EMSGSIZE);
3607 kfree_skb(skb);
3608 goto errout;
3609 }
3610 err = rtnl_notify(skb, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
3611 errout:
3612 if (err < 0)
3613 rtnl_set_sk_err(RTNLGRP_IPV6_PREFIX, err);
3614 }
3615
3616 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3617 {
3618 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3619
3620 switch (event) {
3621 case RTM_NEWADDR:
3622 /*
3623 * If the address was optimistic
3624 * we inserted the route at the start of
3625 * our DAD process, so we don't need
3626 * to do it again
3627 */
3628 if (!(ifp->rt->rt6i_node))
3629 ip6_ins_rt(ifp->rt);
3630 if (ifp->idev->cnf.forwarding)
3631 addrconf_join_anycast(ifp);
3632 break;
3633 case RTM_DELADDR:
3634 if (ifp->idev->cnf.forwarding)
3635 addrconf_leave_anycast(ifp);
3636 addrconf_leave_solict(ifp->idev, &ifp->addr);
3637 dst_hold(&ifp->rt->u.dst);
3638 if (ip6_del_rt(ifp->rt))
3639 dst_free(&ifp->rt->u.dst);
3640 break;
3641 }
3642 }
3643
3644 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3645 {
3646 rcu_read_lock_bh();
3647 if (likely(ifp->idev->dead == 0))
3648 __ipv6_ifa_notify(event, ifp);
3649 rcu_read_unlock_bh();
3650 }
3651
3652 #ifdef CONFIG_SYSCTL
3653
3654 static
3655 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3656 void __user *buffer, size_t *lenp, loff_t *ppos)
3657 {
3658 int *valp = ctl->data;
3659 int val = *valp;
3660 int ret;
3661
3662 ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3663
3664 if (write && valp != &ipv6_devconf_dflt.forwarding) {
3665 if (valp != &ipv6_devconf.forwarding) {
3666 if ((!*valp) ^ (!val)) {
3667 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
3668 if (idev == NULL)
3669 return ret;
3670 dev_forward_change(idev);
3671 }
3672 } else {
3673 ipv6_devconf_dflt.forwarding = ipv6_devconf.forwarding;
3674 addrconf_forward_change();
3675 }
3676 if (*valp)
3677 rt6_purge_dflt_routers();
3678 }
3679
3680 return ret;
3681 }
3682
3683 static int addrconf_sysctl_forward_strategy(ctl_table *table,
3684 int __user *name, int nlen,
3685 void __user *oldval,
3686 size_t __user *oldlenp,
3687 void __user *newval, size_t newlen)
3688 {
3689 int *valp = table->data;
3690 int new;
3691
3692 if (!newval || !newlen)
3693 return 0;
3694 if (newlen != sizeof(int))
3695 return -EINVAL;
3696 if (get_user(new, (int __user *)newval))
3697 return -EFAULT;
3698 if (new == *valp)
3699 return 0;
3700 if (oldval && oldlenp) {
3701 size_t len;
3702 if (get_user(len, oldlenp))
3703 return -EFAULT;
3704 if (len) {
3705 if (len > table->maxlen)
3706 len = table->maxlen;
3707 if (copy_to_user(oldval, valp, len))
3708 return -EFAULT;
3709 if (put_user(len, oldlenp))
3710 return -EFAULT;
3711 }
3712 }
3713
3714 if (valp != &ipv6_devconf_dflt.forwarding) {
3715 if (valp != &ipv6_devconf.forwarding) {
3716 struct inet6_dev *idev = (struct inet6_dev *)table->extra1;
3717 int changed;
3718 if (unlikely(idev == NULL))
3719 return -ENODEV;
3720 changed = (!*valp) ^ (!new);
3721 *valp = new;
3722 if (changed)
3723 dev_forward_change(idev);
3724 } else {
3725 *valp = new;
3726 addrconf_forward_change();
3727 }
3728
3729 if (*valp)
3730 rt6_purge_dflt_routers();
3731 } else
3732 *valp = new;
3733
3734 return 1;
3735 }
3736
3737 static struct addrconf_sysctl_table
3738 {
3739 struct ctl_table_header *sysctl_header;
3740 ctl_table addrconf_vars[__NET_IPV6_MAX];
3741 ctl_table addrconf_dev[2];
3742 ctl_table addrconf_conf_dir[2];
3743 ctl_table addrconf_proto_dir[2];
3744 ctl_table addrconf_root_dir[2];
3745 } addrconf_sysctl __read_mostly = {
3746 .sysctl_header = NULL,
3747 .addrconf_vars = {
3748 {
3749 .ctl_name = NET_IPV6_FORWARDING,
3750 .procname = "forwarding",
3751 .data = &ipv6_devconf.forwarding,
3752 .maxlen = sizeof(int),
3753 .mode = 0644,
3754 .proc_handler = &addrconf_sysctl_forward,
3755 .strategy = &addrconf_sysctl_forward_strategy,
3756 },
3757 {
3758 .ctl_name = NET_IPV6_HOP_LIMIT,
3759 .procname = "hop_limit",
3760 .data = &ipv6_devconf.hop_limit,
3761 .maxlen = sizeof(int),
3762 .mode = 0644,
3763 .proc_handler = proc_dointvec,
3764 },
3765 {
3766 .ctl_name = NET_IPV6_MTU,
3767 .procname = "mtu",
3768 .data = &ipv6_devconf.mtu6,
3769 .maxlen = sizeof(int),
3770 .mode = 0644,
3771 .proc_handler = &proc_dointvec,
3772 },
3773 {
3774 .ctl_name = NET_IPV6_ACCEPT_RA,
3775 .procname = "accept_ra",
3776 .data = &ipv6_devconf.accept_ra,
3777 .maxlen = sizeof(int),
3778 .mode = 0644,
3779 .proc_handler = &proc_dointvec,
3780 },
3781 {
3782 .ctl_name = NET_IPV6_ACCEPT_REDIRECTS,
3783 .procname = "accept_redirects",
3784 .data = &ipv6_devconf.accept_redirects,
3785 .maxlen = sizeof(int),
3786 .mode = 0644,
3787 .proc_handler = &proc_dointvec,
3788 },
3789 {
3790 .ctl_name = NET_IPV6_AUTOCONF,
3791 .procname = "autoconf",
3792 .data = &ipv6_devconf.autoconf,
3793 .maxlen = sizeof(int),
3794 .mode = 0644,
3795 .proc_handler = &proc_dointvec,
3796 },
3797 {
3798 .ctl_name = NET_IPV6_DAD_TRANSMITS,
3799 .procname = "dad_transmits",
3800 .data = &ipv6_devconf.dad_transmits,
3801 .maxlen = sizeof(int),
3802 .mode = 0644,
3803 .proc_handler = &proc_dointvec,
3804 },
3805 {
3806 .ctl_name = NET_IPV6_RTR_SOLICITS,
3807 .procname = "router_solicitations",
3808 .data = &ipv6_devconf.rtr_solicits,
3809 .maxlen = sizeof(int),
3810 .mode = 0644,
3811 .proc_handler = &proc_dointvec,
3812 },
3813 {
3814 .ctl_name = NET_IPV6_RTR_SOLICIT_INTERVAL,
3815 .procname = "router_solicitation_interval",
3816 .data = &ipv6_devconf.rtr_solicit_interval,
3817 .maxlen = sizeof(int),
3818 .mode = 0644,
3819 .proc_handler = &proc_dointvec_jiffies,
3820 .strategy = &sysctl_jiffies,
3821 },
3822 {
3823 .ctl_name = NET_IPV6_RTR_SOLICIT_DELAY,
3824 .procname = "router_solicitation_delay",
3825 .data = &ipv6_devconf.rtr_solicit_delay,
3826 .maxlen = sizeof(int),
3827 .mode = 0644,
3828 .proc_handler = &proc_dointvec_jiffies,
3829 .strategy = &sysctl_jiffies,
3830 },
3831 {
3832 .ctl_name = NET_IPV6_FORCE_MLD_VERSION,
3833 .procname = "force_mld_version",
3834 .data = &ipv6_devconf.force_mld_version,
3835 .maxlen = sizeof(int),
3836 .mode = 0644,
3837 .proc_handler = &proc_dointvec,
3838 },
3839 #ifdef CONFIG_IPV6_PRIVACY
3840 {
3841 .ctl_name = NET_IPV6_USE_TEMPADDR,
3842 .procname = "use_tempaddr",
3843 .data = &ipv6_devconf.use_tempaddr,
3844 .maxlen = sizeof(int),
3845 .mode = 0644,
3846 .proc_handler = &proc_dointvec,
3847 },
3848 {
3849 .ctl_name = NET_IPV6_TEMP_VALID_LFT,
3850 .procname = "temp_valid_lft",
3851 .data = &ipv6_devconf.temp_valid_lft,
3852 .maxlen = sizeof(int),
3853 .mode = 0644,
3854 .proc_handler = &proc_dointvec,
3855 },
3856 {
3857 .ctl_name = NET_IPV6_TEMP_PREFERED_LFT,
3858 .procname = "temp_prefered_lft",
3859 .data = &ipv6_devconf.temp_prefered_lft,
3860 .maxlen = sizeof(int),
3861 .mode = 0644,
3862 .proc_handler = &proc_dointvec,
3863 },
3864 {
3865 .ctl_name = NET_IPV6_REGEN_MAX_RETRY,
3866 .procname = "regen_max_retry",
3867 .data = &ipv6_devconf.regen_max_retry,
3868 .maxlen = sizeof(int),
3869 .mode = 0644,
3870 .proc_handler = &proc_dointvec,
3871 },
3872 {
3873 .ctl_name = NET_IPV6_MAX_DESYNC_FACTOR,
3874 .procname = "max_desync_factor",
3875 .data = &ipv6_devconf.max_desync_factor,
3876 .maxlen = sizeof(int),
3877 .mode = 0644,
3878 .proc_handler = &proc_dointvec,
3879 },
3880 #endif
3881 {
3882 .ctl_name = NET_IPV6_MAX_ADDRESSES,
3883 .procname = "max_addresses",
3884 .data = &ipv6_devconf.max_addresses,
3885 .maxlen = sizeof(int),
3886 .mode = 0644,
3887 .proc_handler = &proc_dointvec,
3888 },
3889 {
3890 .ctl_name = NET_IPV6_ACCEPT_RA_DEFRTR,
3891 .procname = "accept_ra_defrtr",
3892 .data = &ipv6_devconf.accept_ra_defrtr,
3893 .maxlen = sizeof(int),
3894 .mode = 0644,
3895 .proc_handler = &proc_dointvec,
3896 },
3897 {
3898 .ctl_name = NET_IPV6_ACCEPT_RA_PINFO,
3899 .procname = "accept_ra_pinfo",
3900 .data = &ipv6_devconf.accept_ra_pinfo,
3901 .maxlen = sizeof(int),
3902 .mode = 0644,
3903 .proc_handler = &proc_dointvec,
3904 },
3905 #ifdef CONFIG_IPV6_ROUTER_PREF
3906 {
3907 .ctl_name = NET_IPV6_ACCEPT_RA_RTR_PREF,
3908 .procname = "accept_ra_rtr_pref",
3909 .data = &ipv6_devconf.accept_ra_rtr_pref,
3910 .maxlen = sizeof(int),
3911 .mode = 0644,
3912 .proc_handler = &proc_dointvec,
3913 },
3914 {
3915 .ctl_name = NET_IPV6_RTR_PROBE_INTERVAL,
3916 .procname = "router_probe_interval",
3917 .data = &ipv6_devconf.rtr_probe_interval,
3918 .maxlen = sizeof(int),
3919 .mode = 0644,
3920 .proc_handler = &proc_dointvec_jiffies,
3921 .strategy = &sysctl_jiffies,
3922 },
3923 #ifdef CONFIG_IPV6_ROUTE_INFO
3924 {
3925 .ctl_name = NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN,
3926 .procname = "accept_ra_rt_info_max_plen",
3927 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
3928 .maxlen = sizeof(int),
3929 .mode = 0644,
3930 .proc_handler = &proc_dointvec,
3931 },
3932 #endif
3933 #endif
3934 {
3935 .ctl_name = NET_IPV6_PROXY_NDP,
3936 .procname = "proxy_ndp",
3937 .data = &ipv6_devconf.proxy_ndp,
3938 .maxlen = sizeof(int),
3939 .mode = 0644,
3940 .proc_handler = &proc_dointvec,
3941 },
3942 {
3943 .ctl_name = NET_IPV6_ACCEPT_SOURCE_ROUTE,
3944 .procname = "accept_source_route",
3945 .data = &ipv6_devconf.accept_source_route,
3946 .maxlen = sizeof(int),
3947 .mode = 0644,
3948 .proc_handler = &proc_dointvec,
3949 },
3950 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3951 {
3952 .ctl_name = CTL_UNNUMBERED,
3953 .procname = "optimistic_dad",
3954 .data = &ipv6_devconf.optimistic_dad,
3955 .maxlen = sizeof(int),
3956 .mode = 0644,
3957 .proc_handler = &proc_dointvec,
3958
3959 },
3960 #endif
3961 {
3962 .ctl_name = 0, /* sentinel */
3963 }
3964 },
3965 .addrconf_dev = {
3966 {
3967 .ctl_name = NET_PROTO_CONF_ALL,
3968 .procname = "all",
3969 .mode = 0555,
3970 .child = addrconf_sysctl.addrconf_vars,
3971 },
3972 {
3973 .ctl_name = 0, /* sentinel */
3974 }
3975 },
3976 .addrconf_conf_dir = {
3977 {
3978 .ctl_name = NET_IPV6_CONF,
3979 .procname = "conf",
3980 .mode = 0555,
3981 .child = addrconf_sysctl.addrconf_dev,
3982 },
3983 {
3984 .ctl_name = 0, /* sentinel */
3985 }
3986 },
3987 .addrconf_proto_dir = {
3988 {
3989 .ctl_name = NET_IPV6,
3990 .procname = "ipv6",
3991 .mode = 0555,
3992 .child = addrconf_sysctl.addrconf_conf_dir,
3993 },
3994 {
3995 .ctl_name = 0, /* sentinel */
3996 }
3997 },
3998 .addrconf_root_dir = {
3999 {
4000 .ctl_name = CTL_NET,
4001 .procname = "net",
4002 .mode = 0555,
4003 .child = addrconf_sysctl.addrconf_proto_dir,
4004 },
4005 {
4006 .ctl_name = 0, /* sentinel */
4007 }
4008 },
4009 };
4010
4011 static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p)
4012 {
4013 int i;
4014 struct net_device *dev = idev ? idev->dev : NULL;
4015 struct addrconf_sysctl_table *t;
4016 char *dev_name = NULL;
4017
4018 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4019 if (t == NULL)
4020 return;
4021 for (i=0; t->addrconf_vars[i].data; i++) {
4022 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
4023 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4024 }
4025 if (dev) {
4026 dev_name = dev->name;
4027 t->addrconf_dev[0].ctl_name = dev->ifindex;
4028 } else {
4029 dev_name = "default";
4030 t->addrconf_dev[0].ctl_name = NET_PROTO_CONF_DEFAULT;
4031 }
4032
4033 /*
4034 * Make a copy of dev_name, because '.procname' is regarded as const
4035 * by sysctl and we wouldn't want anyone to change it under our feet
4036 * (see SIOCSIFNAME).
4037 */
4038 dev_name = kstrdup(dev_name, GFP_KERNEL);
4039 if (!dev_name)
4040 goto free;
4041
4042 t->addrconf_dev[0].procname = dev_name;
4043
4044 t->addrconf_dev[0].child = t->addrconf_vars;
4045 t->addrconf_conf_dir[0].child = t->addrconf_dev;
4046 t->addrconf_proto_dir[0].child = t->addrconf_conf_dir;
4047 t->addrconf_root_dir[0].child = t->addrconf_proto_dir;
4048
4049 t->sysctl_header = register_sysctl_table(t->addrconf_root_dir);
4050 if (t->sysctl_header == NULL)
4051 goto free_procname;
4052 else
4053 p->sysctl = t;
4054 return;
4055
4056 /* error path */
4057 free_procname:
4058 kfree(dev_name);
4059 free:
4060 kfree(t);
4061
4062 return;
4063 }
4064
4065 static void addrconf_sysctl_unregister(struct ipv6_devconf *p)
4066 {
4067 if (p->sysctl) {
4068 struct addrconf_sysctl_table *t = p->sysctl;
4069 p->sysctl = NULL;
4070 unregister_sysctl_table(t->sysctl_header);
4071 kfree(t->addrconf_dev[0].procname);
4072 kfree(t);
4073 }
4074 }
4075
4076
4077 #endif
4078
4079 /*
4080 * Device notifier
4081 */
4082
4083 int register_inet6addr_notifier(struct notifier_block *nb)
4084 {
4085 return atomic_notifier_chain_register(&inet6addr_chain, nb);
4086 }
4087
4088 EXPORT_SYMBOL(register_inet6addr_notifier);
4089
4090 int unregister_inet6addr_notifier(struct notifier_block *nb)
4091 {
4092 return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
4093 }
4094
4095 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4096
4097 /*
4098 * Init / cleanup code
4099 */
4100
4101 int __init addrconf_init(void)
4102 {
4103 int err = 0;
4104
4105 /* The addrconf netdev notifier requires that loopback_dev
4106 * has it's ipv6 private information allocated and setup
4107 * before it can bring up and give link-local addresses
4108 * to other devices which are up.
4109 *
4110 * Unfortunately, loopback_dev is not necessarily the first
4111 * entry in the global dev_base list of net devices. In fact,
4112 * it is likely to be the very last entry on that list.
4113 * So this causes the notifier registry below to try and
4114 * give link-local addresses to all devices besides loopback_dev
4115 * first, then loopback_dev, which cases all the non-loopback_dev
4116 * devices to fail to get a link-local address.
4117 *
4118 * So, as a temporary fix, allocate the ipv6 structure for
4119 * loopback_dev first by hand.
4120 * Longer term, all of the dependencies ipv6 has upon the loopback
4121 * device and it being up should be removed.
4122 */
4123 rtnl_lock();
4124 if (!ipv6_add_dev(&loopback_dev))
4125 err = -ENOMEM;
4126 rtnl_unlock();
4127 if (err)
4128 return err;
4129
4130 ip6_null_entry.rt6i_idev = in6_dev_get(&loopback_dev);
4131
4132 register_netdevice_notifier(&ipv6_dev_notf);
4133
4134 addrconf_verify(0);
4135
4136 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4137 if (err < 0)
4138 goto errout;
4139
4140 /* Only the first call to __rtnl_register can fail */
4141 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4142 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4143 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4144 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4145 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4146
4147 #ifdef CONFIG_SYSCTL
4148 addrconf_sysctl.sysctl_header =
4149 register_sysctl_table(addrconf_sysctl.addrconf_root_dir);
4150 addrconf_sysctl_register(NULL, &ipv6_devconf_dflt);
4151 #endif
4152
4153 return 0;
4154 errout:
4155 unregister_netdevice_notifier(&ipv6_dev_notf);
4156
4157 return err;
4158 }
4159
4160 void __exit addrconf_cleanup(void)
4161 {
4162 struct net_device *dev;
4163 struct inet6_dev *idev;
4164 struct inet6_ifaddr *ifa;
4165 int i;
4166
4167 unregister_netdevice_notifier(&ipv6_dev_notf);
4168
4169 #ifdef CONFIG_SYSCTL
4170 addrconf_sysctl_unregister(&ipv6_devconf_dflt);
4171 addrconf_sysctl_unregister(&ipv6_devconf);
4172 #endif
4173
4174 rtnl_lock();
4175
4176 /*
4177 * clean dev list.
4178 */
4179
4180 for (dev=dev_base; dev; dev=dev->next) {
4181 if ((idev = __in6_dev_get(dev)) == NULL)
4182 continue;
4183 addrconf_ifdown(dev, 1);
4184 }
4185 addrconf_ifdown(&loopback_dev, 2);
4186
4187 /*
4188 * Check hash table.
4189 */
4190
4191 write_lock_bh(&addrconf_hash_lock);
4192 for (i=0; i < IN6_ADDR_HSIZE; i++) {
4193 for (ifa=inet6_addr_lst[i]; ifa; ) {
4194 struct inet6_ifaddr *bifa;
4195
4196 bifa = ifa;
4197 ifa = ifa->lst_next;
4198 printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
4199 /* Do not free it; something is wrong.
4200 Now we can investigate it with debugger.
4201 */
4202 }
4203 }
4204 write_unlock_bh(&addrconf_hash_lock);
4205
4206 del_timer(&addr_chk_timer);
4207
4208 rtnl_unlock();
4209
4210 #ifdef CONFIG_PROC_FS
4211 proc_net_remove("if_inet6");
4212 #endif
4213 }
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree