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[NET/IPV4/IPV6]: Change some sysctl variables to __read_mostly
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / ipv6 / addrconf.c
blobf1ede90048870b6992abaf10d92ed6e62fef2763
1 /*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
9 * $Id: addrconf.c,v 1.69 2001/10/31 21:55:54 davem Exp $
10 *
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License
13 * as published by the Free Software Foundation; either version
14 * 2 of the License, or (at your option) any later version.
15 */
16
17 /*
18 * Changes:
19 *
20 * Janos Farkas : delete timer on ifdown
21 * <chexum@bankinf.banki.hu>
22 * Andi Kleen : kill double kfree on module
23 * unload.
24 * Maciej W. Rozycki : FDDI support
25 * sekiya@USAGI : Don't send too many RS
26 * packets.
27 * yoshfuji@USAGI : Fixed interval between DAD
28 * packets.
29 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
30 * address validation timer.
31 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
32 * support.
33 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
34 * address on a same interface.
35 * YOSHIFUJI Hideaki @USAGI : ARCnet support
36 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
37 * seq_file.
38 * YOSHIFUJI Hideaki @USAGI : improved source address
39 * selection; consider scope,
40 * status etc.
41 */
42
43 #include <linux/errno.h>
44 #include <linux/types.h>
45 #include <linux/socket.h>
46 #include <linux/sockios.h>
47 #include <linux/sched.h>
48 #include <linux/net.h>
49 #include <linux/in6.h>
50 #include <linux/netdevice.h>
51 #include <linux/if_addr.h>
52 #include <linux/if_arp.h>
53 #include <linux/if_arcnet.h>
54 #include <linux/if_infiniband.h>
55 #include <linux/route.h>
56 #include <linux/inetdevice.h>
57 #include <linux/init.h>
58 #ifdef CONFIG_SYSCTL
59 #include <linux/sysctl.h>
60 #endif
61 #include <linux/capability.h>
62 #include <linux/delay.h>
63 #include <linux/notifier.h>
64 #include <linux/string.h>
65
66 #include <net/sock.h>
67 #include <net/snmp.h>
68
69 #include <net/ipv6.h>
70 #include <net/protocol.h>
71 #include <net/ndisc.h>
72 #include <net/ip6_route.h>
73 #include <net/addrconf.h>
74 #include <net/tcp.h>
75 #include <net/ip.h>
76 #include <net/netlink.h>
77 #include <linux/if_tunnel.h>
78 #include <linux/rtnetlink.h>
79
80 #ifdef CONFIG_IPV6_PRIVACY
81 #include <linux/random.h>
82 #endif
83
84 #include <asm/uaccess.h>
85
86 #include <linux/proc_fs.h>
87 #include <linux/seq_file.h>
88
89 /* Set to 3 to get tracing... */
90 #define ACONF_DEBUG 2
91
92 #if ACONF_DEBUG >= 3
93 #define ADBG(x) printk x
94 #else
95 #define ADBG(x)
96 #endif
97
98 #define INFINITY_LIFE_TIME 0xFFFFFFFF
99 #define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b)))
100
101 #ifdef CONFIG_SYSCTL
102 static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p);
103 static void addrconf_sysctl_unregister(struct ipv6_devconf *p);
104 #endif
105
106 #ifdef CONFIG_IPV6_PRIVACY
107 static int __ipv6_regen_rndid(struct inet6_dev *idev);
108 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
109 static void ipv6_regen_rndid(unsigned long data);
110
111 static int desync_factor = MAX_DESYNC_FACTOR * HZ;
112 #endif
113
114 static int ipv6_count_addresses(struct inet6_dev *idev);
115
116 /*
117 * Configured unicast address hash table
118 */
119 static struct inet6_ifaddr *inet6_addr_lst[IN6_ADDR_HSIZE];
120 static DEFINE_RWLOCK(addrconf_hash_lock);
121
122 /* Protects inet6 devices */
123 DEFINE_RWLOCK(addrconf_lock);
124
125 static void addrconf_verify(unsigned long);
126
127 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
128 static DEFINE_SPINLOCK(addrconf_verify_lock);
129
130 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
131 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
132
133 static int addrconf_ifdown(struct net_device *dev, int how);
134
135 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
136 static void addrconf_dad_timer(unsigned long data);
137 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
138 static void addrconf_dad_run(struct inet6_dev *idev);
139 static void addrconf_rs_timer(unsigned long data);
140 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
141 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
142
143 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
144 struct prefix_info *pinfo);
145 static int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev);
146
147 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
148
149 struct ipv6_devconf ipv6_devconf __read_mostly = {
150 .forwarding = 0,
151 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
152 .mtu6 = IPV6_MIN_MTU,
153 .accept_ra = 1,
154 .accept_redirects = 1,
155 .autoconf = 1,
156 .force_mld_version = 0,
157 .dad_transmits = 1,
158 .rtr_solicits = MAX_RTR_SOLICITATIONS,
159 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
160 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
161 #ifdef CONFIG_IPV6_PRIVACY
162 .use_tempaddr = 0,
163 .temp_valid_lft = TEMP_VALID_LIFETIME,
164 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
165 .regen_max_retry = REGEN_MAX_RETRY,
166 .max_desync_factor = MAX_DESYNC_FACTOR,
167 #endif
168 .max_addresses = IPV6_MAX_ADDRESSES,
169 .accept_ra_defrtr = 1,
170 .accept_ra_pinfo = 1,
171 #ifdef CONFIG_IPV6_ROUTER_PREF
172 .accept_ra_rtr_pref = 1,
173 .rtr_probe_interval = 60 * HZ,
174 #ifdef CONFIG_IPV6_ROUTE_INFO
175 .accept_ra_rt_info_max_plen = 0,
176 #endif
177 #endif
178 };
179
180 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
181 .forwarding = 0,
182 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
183 .mtu6 = IPV6_MIN_MTU,
184 .accept_ra = 1,
185 .accept_redirects = 1,
186 .autoconf = 1,
187 .dad_transmits = 1,
188 .rtr_solicits = MAX_RTR_SOLICITATIONS,
189 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
190 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
191 #ifdef CONFIG_IPV6_PRIVACY
192 .use_tempaddr = 0,
193 .temp_valid_lft = TEMP_VALID_LIFETIME,
194 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
195 .regen_max_retry = REGEN_MAX_RETRY,
196 .max_desync_factor = MAX_DESYNC_FACTOR,
197 #endif
198 .max_addresses = IPV6_MAX_ADDRESSES,
199 .accept_ra_defrtr = 1,
200 .accept_ra_pinfo = 1,
201 #ifdef CONFIG_IPV6_ROUTER_PREF
202 .accept_ra_rtr_pref = 1,
203 .rtr_probe_interval = 60 * HZ,
204 #ifdef CONFIG_IPV6_ROUTE_INFO
205 .accept_ra_rt_info_max_plen = 0,
206 #endif
207 #endif
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 #define IPV6_ADDR_SCOPE_TYPE(scope) ((scope) << 16)
217
218 static inline unsigned ipv6_addr_scope2type(unsigned scope)
219 {
220 switch(scope) {
221 case IPV6_ADDR_SCOPE_NODELOCAL:
222 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_NODELOCAL) |
223 IPV6_ADDR_LOOPBACK);
224 case IPV6_ADDR_SCOPE_LINKLOCAL:
225 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL) |
226 IPV6_ADDR_LINKLOCAL);
227 case IPV6_ADDR_SCOPE_SITELOCAL:
228 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_SITELOCAL) |
229 IPV6_ADDR_SITELOCAL);
230 }
231 return IPV6_ADDR_SCOPE_TYPE(scope);
232 }
233
234 int __ipv6_addr_type(const struct in6_addr *addr)
235 {
236 u32 st;
237
238 st = addr->s6_addr32[0];
239
240 /* Consider all addresses with the first three bits different of
241 000 and 111 as unicasts.
242 */
243 if ((st & htonl(0xE0000000)) != htonl(0x00000000) &&
244 (st & htonl(0xE0000000)) != htonl(0xE0000000))
245 return (IPV6_ADDR_UNICAST |
246 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));
247
248 if ((st & htonl(0xFF000000)) == htonl(0xFF000000)) {
249 /* multicast */
250 /* addr-select 3.1 */
251 return (IPV6_ADDR_MULTICAST |
252 ipv6_addr_scope2type(IPV6_ADDR_MC_SCOPE(addr)));
253 }
254
255 if ((st & htonl(0xFFC00000)) == htonl(0xFE800000))
256 return (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_UNICAST |
257 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL)); /* addr-select 3.1 */
258 if ((st & htonl(0xFFC00000)) == htonl(0xFEC00000))
259 return (IPV6_ADDR_SITELOCAL | IPV6_ADDR_UNICAST |
260 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_SITELOCAL)); /* addr-select 3.1 */
261
262 if ((addr->s6_addr32[0] | addr->s6_addr32[1]) == 0) {
263 if (addr->s6_addr32[2] == 0) {
264 if (addr->s6_addr32[3] == 0)
265 return IPV6_ADDR_ANY;
266
267 if (addr->s6_addr32[3] == htonl(0x00000001))
268 return (IPV6_ADDR_LOOPBACK | IPV6_ADDR_UNICAST |
269 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL)); /* addr-select 3.4 */
270
271 return (IPV6_ADDR_COMPATv4 | IPV6_ADDR_UNICAST |
272 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* addr-select 3.3 */
273 }
274
275 if (addr->s6_addr32[2] == htonl(0x0000ffff))
276 return (IPV6_ADDR_MAPPED |
277 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* addr-select 3.3 */
278 }
279
280 return (IPV6_ADDR_RESERVED |
281 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* addr-select 3.4 */
282 }
283
284 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
285 {
286 if (del_timer(&ifp->timer))
287 __in6_ifa_put(ifp);
288 }
289
290 enum addrconf_timer_t
291 {
292 AC_NONE,
293 AC_DAD,
294 AC_RS,
295 };
296
297 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
298 enum addrconf_timer_t what,
299 unsigned long when)
300 {
301 if (!del_timer(&ifp->timer))
302 in6_ifa_hold(ifp);
303
304 switch (what) {
305 case AC_DAD:
306 ifp->timer.function = addrconf_dad_timer;
307 break;
308 case AC_RS:
309 ifp->timer.function = addrconf_rs_timer;
310 break;
311 default:;
312 }
313 ifp->timer.expires = jiffies + when;
314 add_timer(&ifp->timer);
315 }
316
317 /* Nobody refers to this device, we may destroy it. */
318
319 void in6_dev_finish_destroy(struct inet6_dev *idev)
320 {
321 struct net_device *dev = idev->dev;
322 BUG_TRAP(idev->addr_list==NULL);
323 BUG_TRAP(idev->mc_list==NULL);
324 #ifdef NET_REFCNT_DEBUG
325 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
326 #endif
327 dev_put(dev);
328 if (!idev->dead) {
329 printk("Freeing alive inet6 device %p\n", idev);
330 return;
331 }
332 snmp6_free_dev(idev);
333 kfree(idev);
334 }
335
336 static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
337 {
338 struct inet6_dev *ndev;
339
340 ASSERT_RTNL();
341
342 if (dev->mtu < IPV6_MIN_MTU)
343 return NULL;
344
345 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
346
347 if (ndev == NULL)
348 return NULL;
349
350 rwlock_init(&ndev->lock);
351 ndev->dev = dev;
352 memcpy(&ndev->cnf, &ipv6_devconf_dflt, sizeof(ndev->cnf));
353 ndev->cnf.mtu6 = dev->mtu;
354 ndev->cnf.sysctl = NULL;
355 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
356 if (ndev->nd_parms == NULL) {
357 kfree(ndev);
358 return NULL;
359 }
360 /* We refer to the device */
361 dev_hold(dev);
362
363 if (snmp6_alloc_dev(ndev) < 0) {
364 ADBG((KERN_WARNING
365 "%s(): cannot allocate memory for statistics; dev=%s.\n",
366 __FUNCTION__, dev->name));
367 neigh_parms_release(&nd_tbl, ndev->nd_parms);
368 ndev->dead = 1;
369 in6_dev_finish_destroy(ndev);
370 return NULL;
371 }
372
373 if (snmp6_register_dev(ndev) < 0) {
374 ADBG((KERN_WARNING
375 "%s(): cannot create /proc/net/dev_snmp6/%s\n",
376 __FUNCTION__, dev->name));
377 neigh_parms_release(&nd_tbl, ndev->nd_parms);
378 ndev->dead = 1;
379 in6_dev_finish_destroy(ndev);
380 return NULL;
381 }
382
383 /* One reference from device. We must do this before
384 * we invoke __ipv6_regen_rndid().
385 */
386 in6_dev_hold(ndev);
387
388 #ifdef CONFIG_IPV6_PRIVACY
389 init_timer(&ndev->regen_timer);
390 ndev->regen_timer.function = ipv6_regen_rndid;
391 ndev->regen_timer.data = (unsigned long) ndev;
392 if ((dev->flags&IFF_LOOPBACK) ||
393 dev->type == ARPHRD_TUNNEL ||
394 dev->type == ARPHRD_NONE ||
395 dev->type == ARPHRD_SIT) {
396 printk(KERN_INFO
397 "%s: Disabled Privacy Extensions\n",
398 dev->name);
399 ndev->cnf.use_tempaddr = -1;
400 } else {
401 in6_dev_hold(ndev);
402 ipv6_regen_rndid((unsigned long) ndev);
403 }
404 #endif
405
406 if (netif_carrier_ok(dev))
407 ndev->if_flags |= IF_READY;
408
409 write_lock_bh(&addrconf_lock);
410 dev->ip6_ptr = ndev;
411 write_unlock_bh(&addrconf_lock);
412
413 ipv6_mc_init_dev(ndev);
414 ndev->tstamp = jiffies;
415 #ifdef CONFIG_SYSCTL
416 neigh_sysctl_register(dev, ndev->nd_parms, NET_IPV6,
417 NET_IPV6_NEIGH, "ipv6",
418 &ndisc_ifinfo_sysctl_change,
419 NULL);
420 addrconf_sysctl_register(ndev, &ndev->cnf);
421 #endif
422 return ndev;
423 }
424
425 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
426 {
427 struct inet6_dev *idev;
428
429 ASSERT_RTNL();
430
431 if ((idev = __in6_dev_get(dev)) == NULL) {
432 if ((idev = ipv6_add_dev(dev)) == NULL)
433 return NULL;
434 }
435
436 if (dev->flags&IFF_UP)
437 ipv6_mc_up(idev);
438 return idev;
439 }
440
441 #ifdef CONFIG_SYSCTL
442 static void dev_forward_change(struct inet6_dev *idev)
443 {
444 struct net_device *dev;
445 struct inet6_ifaddr *ifa;
446 struct in6_addr addr;
447
448 if (!idev)
449 return;
450 dev = idev->dev;
451 if (dev && (dev->flags & IFF_MULTICAST)) {
452 ipv6_addr_all_routers(&addr);
453
454 if (idev->cnf.forwarding)
455 ipv6_dev_mc_inc(dev, &addr);
456 else
457 ipv6_dev_mc_dec(dev, &addr);
458 }
459 for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
460 if (idev->cnf.forwarding)
461 addrconf_join_anycast(ifa);
462 else
463 addrconf_leave_anycast(ifa);
464 }
465 }
466
467
468 static void addrconf_forward_change(void)
469 {
470 struct net_device *dev;
471 struct inet6_dev *idev;
472
473 read_lock(&dev_base_lock);
474 for (dev=dev_base; dev; dev=dev->next) {
475 read_lock(&addrconf_lock);
476 idev = __in6_dev_get(dev);
477 if (idev) {
478 int changed = (!idev->cnf.forwarding) ^ (!ipv6_devconf.forwarding);
479 idev->cnf.forwarding = ipv6_devconf.forwarding;
480 if (changed)
481 dev_forward_change(idev);
482 }
483 read_unlock(&addrconf_lock);
484 }
485 read_unlock(&dev_base_lock);
486 }
487 #endif
488
489 /* Nobody refers to this ifaddr, destroy it */
490
491 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
492 {
493 BUG_TRAP(ifp->if_next==NULL);
494 BUG_TRAP(ifp->lst_next==NULL);
495 #ifdef NET_REFCNT_DEBUG
496 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
497 #endif
498
499 in6_dev_put(ifp->idev);
500
501 if (del_timer(&ifp->timer))
502 printk("Timer is still running, when freeing ifa=%p\n", ifp);
503
504 if (!ifp->dead) {
505 printk("Freeing alive inet6 address %p\n", ifp);
506 return;
507 }
508 dst_release(&ifp->rt->u.dst);
509
510 kfree(ifp);
511 }
512
513 static void
514 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
515 {
516 struct inet6_ifaddr *ifa, **ifap;
517 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
518
519 /*
520 * Each device address list is sorted in order of scope -
521 * global before linklocal.
522 */
523 for (ifap = &idev->addr_list; (ifa = *ifap) != NULL;
524 ifap = &ifa->if_next) {
525 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
526 break;
527 }
528
529 ifp->if_next = *ifap;
530 *ifap = ifp;
531 }
532
533 /* On success it returns ifp with increased reference count */
534
535 static struct inet6_ifaddr *
536 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
537 int scope, u32 flags)
538 {
539 struct inet6_ifaddr *ifa = NULL;
540 struct rt6_info *rt;
541 int hash;
542 int err = 0;
543
544 read_lock_bh(&addrconf_lock);
545 if (idev->dead) {
546 err = -ENODEV; /*XXX*/
547 goto out2;
548 }
549
550 write_lock(&addrconf_hash_lock);
551
552 /* Ignore adding duplicate addresses on an interface */
553 if (ipv6_chk_same_addr(addr, idev->dev)) {
554 ADBG(("ipv6_add_addr: already assigned\n"));
555 err = -EEXIST;
556 goto out;
557 }
558
559 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
560
561 if (ifa == NULL) {
562 ADBG(("ipv6_add_addr: malloc failed\n"));
563 err = -ENOBUFS;
564 goto out;
565 }
566
567 rt = addrconf_dst_alloc(idev, addr, 0);
568 if (IS_ERR(rt)) {
569 err = PTR_ERR(rt);
570 goto out;
571 }
572
573 ipv6_addr_copy(&ifa->addr, addr);
574
575 spin_lock_init(&ifa->lock);
576 init_timer(&ifa->timer);
577 ifa->timer.data = (unsigned long) ifa;
578 ifa->scope = scope;
579 ifa->prefix_len = pfxlen;
580 ifa->flags = flags | IFA_F_TENTATIVE;
581 ifa->cstamp = ifa->tstamp = jiffies;
582
583 ifa->rt = rt;
584
585 ifa->idev = idev;
586 in6_dev_hold(idev);
587 /* For caller */
588 in6_ifa_hold(ifa);
589
590 /* Add to big hash table */
591 hash = ipv6_addr_hash(addr);
592
593 ifa->lst_next = inet6_addr_lst[hash];
594 inet6_addr_lst[hash] = ifa;
595 in6_ifa_hold(ifa);
596 write_unlock(&addrconf_hash_lock);
597
598 write_lock(&idev->lock);
599 /* Add to inet6_dev unicast addr list. */
600 ipv6_link_dev_addr(idev, ifa);
601
602 #ifdef CONFIG_IPV6_PRIVACY
603 if (ifa->flags&IFA_F_TEMPORARY) {
604 ifa->tmp_next = idev->tempaddr_list;
605 idev->tempaddr_list = ifa;
606 in6_ifa_hold(ifa);
607 }
608 #endif
609
610 in6_ifa_hold(ifa);
611 write_unlock(&idev->lock);
612 out2:
613 read_unlock_bh(&addrconf_lock);
614
615 if (likely(err == 0))
616 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
617 else {
618 kfree(ifa);
619 ifa = ERR_PTR(err);
620 }
621
622 return ifa;
623 out:
624 write_unlock(&addrconf_hash_lock);
625 goto out2;
626 }
627
628 /* This function wants to get referenced ifp and releases it before return */
629
630 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
631 {
632 struct inet6_ifaddr *ifa, **ifap;
633 struct inet6_dev *idev = ifp->idev;
634 int hash;
635 int deleted = 0, onlink = 0;
636 unsigned long expires = jiffies;
637
638 hash = ipv6_addr_hash(&ifp->addr);
639
640 ifp->dead = 1;
641
642 write_lock_bh(&addrconf_hash_lock);
643 for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
644 ifap = &ifa->lst_next) {
645 if (ifa == ifp) {
646 *ifap = ifa->lst_next;
647 __in6_ifa_put(ifp);
648 ifa->lst_next = NULL;
649 break;
650 }
651 }
652 write_unlock_bh(&addrconf_hash_lock);
653
654 write_lock_bh(&idev->lock);
655 #ifdef CONFIG_IPV6_PRIVACY
656 if (ifp->flags&IFA_F_TEMPORARY) {
657 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
658 ifap = &ifa->tmp_next) {
659 if (ifa == ifp) {
660 *ifap = ifa->tmp_next;
661 if (ifp->ifpub) {
662 in6_ifa_put(ifp->ifpub);
663 ifp->ifpub = NULL;
664 }
665 __in6_ifa_put(ifp);
666 ifa->tmp_next = NULL;
667 break;
668 }
669 }
670 }
671 #endif
672
673 for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
674 if (ifa == ifp) {
675 *ifap = ifa->if_next;
676 __in6_ifa_put(ifp);
677 ifa->if_next = NULL;
678 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
679 break;
680 deleted = 1;
681 continue;
682 } else if (ifp->flags & IFA_F_PERMANENT) {
683 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
684 ifp->prefix_len)) {
685 if (ifa->flags & IFA_F_PERMANENT) {
686 onlink = 1;
687 if (deleted)
688 break;
689 } else {
690 unsigned long lifetime;
691
692 if (!onlink)
693 onlink = -1;
694
695 spin_lock(&ifa->lock);
696 lifetime = min_t(unsigned long,
697 ifa->valid_lft, 0x7fffffffUL/HZ);
698 if (time_before(expires,
699 ifa->tstamp + lifetime * HZ))
700 expires = ifa->tstamp + lifetime * HZ;
701 spin_unlock(&ifa->lock);
702 }
703 }
704 }
705 ifap = &ifa->if_next;
706 }
707 write_unlock_bh(&idev->lock);
708
709 ipv6_ifa_notify(RTM_DELADDR, ifp);
710
711 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
712
713 addrconf_del_timer(ifp);
714
715 /*
716 * Purge or update corresponding prefix
717 *
718 * 1) we don't purge prefix here if address was not permanent.
719 * prefix is managed by its own lifetime.
720 * 2) if there're no addresses, delete prefix.
721 * 3) if there're still other permanent address(es),
722 * corresponding prefix is still permanent.
723 * 4) otherwise, update prefix lifetime to the
724 * longest valid lifetime among the corresponding
725 * addresses on the device.
726 * Note: subsequent RA will update lifetime.
727 *
728 * --yoshfuji
729 */
730 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
731 struct in6_addr prefix;
732 struct rt6_info *rt;
733
734 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
735 rt = rt6_lookup(&prefix, NULL, ifp->idev->dev->ifindex, 1);
736
737 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
738 if (onlink == 0) {
739 ip6_del_rt(rt, NULL, NULL, NULL);
740 rt = NULL;
741 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
742 rt->rt6i_expires = expires;
743 rt->rt6i_flags |= RTF_EXPIRES;
744 }
745 }
746 dst_release(&rt->u.dst);
747 }
748
749 in6_ifa_put(ifp);
750 }
751
752 #ifdef CONFIG_IPV6_PRIVACY
753 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
754 {
755 struct inet6_dev *idev = ifp->idev;
756 struct in6_addr addr, *tmpaddr;
757 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
758 int tmp_plen;
759 int ret = 0;
760 int max_addresses;
761
762 write_lock(&idev->lock);
763 if (ift) {
764 spin_lock_bh(&ift->lock);
765 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
766 spin_unlock_bh(&ift->lock);
767 tmpaddr = &addr;
768 } else {
769 tmpaddr = NULL;
770 }
771 retry:
772 in6_dev_hold(idev);
773 if (idev->cnf.use_tempaddr <= 0) {
774 write_unlock(&idev->lock);
775 printk(KERN_INFO
776 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
777 in6_dev_put(idev);
778 ret = -1;
779 goto out;
780 }
781 spin_lock_bh(&ifp->lock);
782 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
783 idev->cnf.use_tempaddr = -1; /*XXX*/
784 spin_unlock_bh(&ifp->lock);
785 write_unlock(&idev->lock);
786 printk(KERN_WARNING
787 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
788 in6_dev_put(idev);
789 ret = -1;
790 goto out;
791 }
792 in6_ifa_hold(ifp);
793 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
794 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
795 spin_unlock_bh(&ifp->lock);
796 write_unlock(&idev->lock);
797 printk(KERN_WARNING
798 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
799 in6_ifa_put(ifp);
800 in6_dev_put(idev);
801 ret = -1;
802 goto out;
803 }
804 memcpy(&addr.s6_addr[8], idev->rndid, 8);
805 tmp_valid_lft = min_t(__u32,
806 ifp->valid_lft,
807 idev->cnf.temp_valid_lft);
808 tmp_prefered_lft = min_t(__u32,
809 ifp->prefered_lft,
810 idev->cnf.temp_prefered_lft - desync_factor / HZ);
811 tmp_plen = ifp->prefix_len;
812 max_addresses = idev->cnf.max_addresses;
813 tmp_cstamp = ifp->cstamp;
814 tmp_tstamp = ifp->tstamp;
815 spin_unlock_bh(&ifp->lock);
816
817 write_unlock(&idev->lock);
818 ift = !max_addresses ||
819 ipv6_count_addresses(idev) < max_addresses ?
820 ipv6_add_addr(idev, &addr, tmp_plen,
821 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK, IFA_F_TEMPORARY) : NULL;
822 if (!ift || IS_ERR(ift)) {
823 in6_ifa_put(ifp);
824 in6_dev_put(idev);
825 printk(KERN_INFO
826 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
827 tmpaddr = &addr;
828 write_lock(&idev->lock);
829 goto retry;
830 }
831
832 spin_lock_bh(&ift->lock);
833 ift->ifpub = ifp;
834 ift->valid_lft = tmp_valid_lft;
835 ift->prefered_lft = tmp_prefered_lft;
836 ift->cstamp = tmp_cstamp;
837 ift->tstamp = tmp_tstamp;
838 spin_unlock_bh(&ift->lock);
839
840 addrconf_dad_start(ift, 0);
841 in6_ifa_put(ift);
842 in6_dev_put(idev);
843 out:
844 return ret;
845 }
846 #endif
847
848 /*
849 * Choose an appropriate source address (RFC3484)
850 */
851 struct ipv6_saddr_score {
852 int addr_type;
853 unsigned int attrs;
854 int matchlen;
855 int scope;
856 unsigned int rule;
857 };
858
859 #define IPV6_SADDR_SCORE_LOCAL 0x0001
860 #define IPV6_SADDR_SCORE_PREFERRED 0x0004
861 #define IPV6_SADDR_SCORE_HOA 0x0008
862 #define IPV6_SADDR_SCORE_OIF 0x0010
863 #define IPV6_SADDR_SCORE_LABEL 0x0020
864 #define IPV6_SADDR_SCORE_PRIVACY 0x0040
865
866 static int inline ipv6_saddr_preferred(int type)
867 {
868 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
869 IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
870 return 1;
871 return 0;
872 }
873
874 /* static matching label */
875 static int inline ipv6_saddr_label(const struct in6_addr *addr, int type)
876 {
877 /*
878 * prefix (longest match) label
879 * -----------------------------
880 * ::1/128 0
881 * ::/0 1
882 * 2002::/16 2
883 * ::/96 3
884 * ::ffff:0:0/96 4
885 * fc00::/7 5
886 * 2001::/32 6
887 */
888 if (type & IPV6_ADDR_LOOPBACK)
889 return 0;
890 else if (type & IPV6_ADDR_COMPATv4)
891 return 3;
892 else if (type & IPV6_ADDR_MAPPED)
893 return 4;
894 else if (addr->s6_addr32[0] == htonl(0x20010000))
895 return 6;
896 else if (addr->s6_addr16[0] == htons(0x2002))
897 return 2;
898 else if ((addr->s6_addr[0] & 0xfe) == 0xfc)
899 return 5;
900 return 1;
901 }
902
903 int ipv6_dev_get_saddr(struct net_device *daddr_dev,
904 struct in6_addr *daddr, struct in6_addr *saddr)
905 {
906 struct ipv6_saddr_score hiscore;
907 struct inet6_ifaddr *ifa_result = NULL;
908 int daddr_type = __ipv6_addr_type(daddr);
909 int daddr_scope = __ipv6_addr_src_scope(daddr_type);
910 u32 daddr_label = ipv6_saddr_label(daddr, daddr_type);
911 struct net_device *dev;
912
913 memset(&hiscore, 0, sizeof(hiscore));
914
915 read_lock(&dev_base_lock);
916 read_lock(&addrconf_lock);
917
918 for (dev = dev_base; dev; dev=dev->next) {
919 struct inet6_dev *idev;
920 struct inet6_ifaddr *ifa;
921
922 /* Rule 0: Candidate Source Address (section 4)
923 * - multicast and link-local destination address,
924 * the set of candidate source address MUST only
925 * include addresses assigned to interfaces
926 * belonging to the same link as the outgoing
927 * interface.
928 * (- For site-local destination addresses, the
929 * set of candidate source addresses MUST only
930 * include addresses assigned to interfaces
931 * belonging to the same site as the outgoing
932 * interface.)
933 */
934 if ((daddr_type & IPV6_ADDR_MULTICAST ||
935 daddr_scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
936 daddr_dev && dev != daddr_dev)
937 continue;
938
939 idev = __in6_dev_get(dev);
940 if (!idev)
941 continue;
942
943 read_lock_bh(&idev->lock);
944 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
945 struct ipv6_saddr_score score;
946
947 score.addr_type = __ipv6_addr_type(&ifa->addr);
948
949 /* Rule 0:
950 * - Tentative Address (RFC2462 section 5.4)
951 * - A tentative address is not considered
952 * "assigned to an interface" in the traditional
953 * sense.
954 * - Candidate Source Address (section 4)
955 * - In any case, anycast addresses, multicast
956 * addresses, and the unspecified address MUST
957 * NOT be included in a candidate set.
958 */
959 if (ifa->flags & IFA_F_TENTATIVE)
960 continue;
961 if (unlikely(score.addr_type == IPV6_ADDR_ANY ||
962 score.addr_type & IPV6_ADDR_MULTICAST)) {
963 LIMIT_NETDEBUG(KERN_DEBUG
964 "ADDRCONF: unspecified / multicast address"
965 "assigned as unicast address on %s",
966 dev->name);
967 continue;
968 }
969
970 score.attrs = 0;
971 score.matchlen = 0;
972 score.scope = 0;
973 score.rule = 0;
974
975 if (ifa_result == NULL) {
976 /* record it if the first available entry */
977 goto record_it;
978 }
979
980 /* Rule 1: Prefer same address */
981 if (hiscore.rule < 1) {
982 if (ipv6_addr_equal(&ifa_result->addr, daddr))
983 hiscore.attrs |= IPV6_SADDR_SCORE_LOCAL;
984 hiscore.rule++;
985 }
986 if (ipv6_addr_equal(&ifa->addr, daddr)) {
987 score.attrs |= IPV6_SADDR_SCORE_LOCAL;
988 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)) {
989 score.rule = 1;
990 goto record_it;
991 }
992 } else {
993 if (hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)
994 continue;
995 }
996
997 /* Rule 2: Prefer appropriate scope */
998 if (hiscore.rule < 2) {
999 hiscore.scope = __ipv6_addr_src_scope(hiscore.addr_type);
1000 hiscore.rule++;
1001 }
1002 score.scope = __ipv6_addr_src_scope(score.addr_type);
1003 if (hiscore.scope < score.scope) {
1004 if (hiscore.scope < daddr_scope) {
1005 score.rule = 2;
1006 goto record_it;
1007 } else
1008 continue;
1009 } else if (score.scope < hiscore.scope) {
1010 if (score.scope < daddr_scope)
1011 break; /* addresses sorted by scope */
1012 else {
1013 score.rule = 2;
1014 goto record_it;
1015 }
1016 }
1017
1018 /* Rule 3: Avoid deprecated address */
1019 if (hiscore.rule < 3) {
1020 if (ipv6_saddr_preferred(hiscore.addr_type) ||
1021 !(ifa_result->flags & IFA_F_DEPRECATED))
1022 hiscore.attrs |= IPV6_SADDR_SCORE_PREFERRED;
1023 hiscore.rule++;
1024 }
1025 if (ipv6_saddr_preferred(score.addr_type) ||
1026 !(ifa->flags & IFA_F_DEPRECATED)) {
1027 score.attrs |= IPV6_SADDR_SCORE_PREFERRED;
1028 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)) {
1029 score.rule = 3;
1030 goto record_it;
1031 }
1032 } else {
1033 if (hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)
1034 continue;
1035 }
1036
1037 /* Rule 4: Prefer home address -- not implemented yet */
1038 if (hiscore.rule < 4)
1039 hiscore.rule++;
1040
1041 /* Rule 5: Prefer outgoing interface */
1042 if (hiscore.rule < 5) {
1043 if (daddr_dev == NULL ||
1044 daddr_dev == ifa_result->idev->dev)
1045 hiscore.attrs |= IPV6_SADDR_SCORE_OIF;
1046 hiscore.rule++;
1047 }
1048 if (daddr_dev == NULL ||
1049 daddr_dev == ifa->idev->dev) {
1050 score.attrs |= IPV6_SADDR_SCORE_OIF;
1051 if (!(hiscore.attrs & IPV6_SADDR_SCORE_OIF)) {
1052 score.rule = 5;
1053 goto record_it;
1054 }
1055 } else {
1056 if (hiscore.attrs & IPV6_SADDR_SCORE_OIF)
1057 continue;
1058 }
1059
1060 /* Rule 6: Prefer matching label */
1061 if (hiscore.rule < 6) {
1062 if (ipv6_saddr_label(&ifa_result->addr, hiscore.addr_type) == daddr_label)
1063 hiscore.attrs |= IPV6_SADDR_SCORE_LABEL;
1064 hiscore.rule++;
1065 }
1066 if (ipv6_saddr_label(&ifa->addr, score.addr_type) == daddr_label) {
1067 score.attrs |= IPV6_SADDR_SCORE_LABEL;
1068 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LABEL)) {
1069 score.rule = 6;
1070 goto record_it;
1071 }
1072 } else {
1073 if (hiscore.attrs & IPV6_SADDR_SCORE_LABEL)
1074 continue;
1075 }
1076
1077 #ifdef CONFIG_IPV6_PRIVACY
1078 /* Rule 7: Prefer public address
1079 * Note: prefer temprary address if use_tempaddr >= 2
1080 */
1081 if (hiscore.rule < 7) {
1082 if ((!(ifa_result->flags & IFA_F_TEMPORARY)) ^
1083 (ifa_result->idev->cnf.use_tempaddr >= 2))
1084 hiscore.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1085 hiscore.rule++;
1086 }
1087 if ((!(ifa->flags & IFA_F_TEMPORARY)) ^
1088 (ifa->idev->cnf.use_tempaddr >= 2)) {
1089 score.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1090 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)) {
1091 score.rule = 7;
1092 goto record_it;
1093 }
1094 } else {
1095 if (hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)
1096 continue;
1097 }
1098 #else
1099 if (hiscore.rule < 7)
1100 hiscore.rule++;
1101 #endif
1102 /* Rule 8: Use longest matching prefix */
1103 if (hiscore.rule < 8) {
1104 hiscore.matchlen = ipv6_addr_diff(&ifa_result->addr, daddr);
1105 hiscore.rule++;
1106 }
1107 score.matchlen = ipv6_addr_diff(&ifa->addr, daddr);
1108 if (score.matchlen > hiscore.matchlen) {
1109 score.rule = 8;
1110 goto record_it;
1111 }
1112 #if 0
1113 else if (score.matchlen < hiscore.matchlen)
1114 continue;
1115 #endif
1116
1117 /* Final Rule: choose first available one */
1118 continue;
1119 record_it:
1120 if (ifa_result)
1121 in6_ifa_put(ifa_result);
1122 in6_ifa_hold(ifa);
1123 ifa_result = ifa;
1124 hiscore = score;
1125 }
1126 read_unlock_bh(&idev->lock);
1127 }
1128 read_unlock(&addrconf_lock);
1129 read_unlock(&dev_base_lock);
1130
1131 if (!ifa_result)
1132 return -EADDRNOTAVAIL;
1133
1134 ipv6_addr_copy(saddr, &ifa_result->addr);
1135 in6_ifa_put(ifa_result);
1136 return 0;
1137 }
1138
1139
1140 int ipv6_get_saddr(struct dst_entry *dst,
1141 struct in6_addr *daddr, struct in6_addr *saddr)
1142 {
1143 return ipv6_dev_get_saddr(dst ? ((struct rt6_info *)dst)->rt6i_idev->dev : NULL, daddr, saddr);
1144 }
1145
1146
1147 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr)
1148 {
1149 struct inet6_dev *idev;
1150 int err = -EADDRNOTAVAIL;
1151
1152 read_lock(&addrconf_lock);
1153 if ((idev = __in6_dev_get(dev)) != NULL) {
1154 struct inet6_ifaddr *ifp;
1155
1156 read_lock_bh(&idev->lock);
1157 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1158 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1159 ipv6_addr_copy(addr, &ifp->addr);
1160 err = 0;
1161 break;
1162 }
1163 }
1164 read_unlock_bh(&idev->lock);
1165 }
1166 read_unlock(&addrconf_lock);
1167 return err;
1168 }
1169
1170 static int ipv6_count_addresses(struct inet6_dev *idev)
1171 {
1172 int cnt = 0;
1173 struct inet6_ifaddr *ifp;
1174
1175 read_lock_bh(&idev->lock);
1176 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1177 cnt++;
1178 read_unlock_bh(&idev->lock);
1179 return cnt;
1180 }
1181
1182 int ipv6_chk_addr(struct in6_addr *addr, struct net_device *dev, int strict)
1183 {
1184 struct inet6_ifaddr * ifp;
1185 u8 hash = ipv6_addr_hash(addr);
1186
1187 read_lock_bh(&addrconf_hash_lock);
1188 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1189 if (ipv6_addr_equal(&ifp->addr, addr) &&
1190 !(ifp->flags&IFA_F_TENTATIVE)) {
1191 if (dev == NULL || ifp->idev->dev == dev ||
1192 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1193 break;
1194 }
1195 }
1196 read_unlock_bh(&addrconf_hash_lock);
1197 return ifp != NULL;
1198 }
1199
1200 static
1201 int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev)
1202 {
1203 struct inet6_ifaddr * ifp;
1204 u8 hash = ipv6_addr_hash(addr);
1205
1206 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1207 if (ipv6_addr_equal(&ifp->addr, addr)) {
1208 if (dev == NULL || ifp->idev->dev == dev)
1209 break;
1210 }
1211 }
1212 return ifp != NULL;
1213 }
1214
1215 struct inet6_ifaddr * ipv6_get_ifaddr(struct in6_addr *addr, struct net_device *dev, int strict)
1216 {
1217 struct inet6_ifaddr * ifp;
1218 u8 hash = ipv6_addr_hash(addr);
1219
1220 read_lock_bh(&addrconf_hash_lock);
1221 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1222 if (ipv6_addr_equal(&ifp->addr, addr)) {
1223 if (dev == NULL || ifp->idev->dev == dev ||
1224 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1225 in6_ifa_hold(ifp);
1226 break;
1227 }
1228 }
1229 }
1230 read_unlock_bh(&addrconf_hash_lock);
1231
1232 return ifp;
1233 }
1234
1235 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1236 {
1237 const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
1238 const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
1239 u32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
1240 u32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1241 int sk_ipv6only = ipv6_only_sock(sk);
1242 int sk2_ipv6only = inet_v6_ipv6only(sk2);
1243 int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1244 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1245
1246 if (!sk2_rcv_saddr && !sk_ipv6only)
1247 return 1;
1248
1249 if (addr_type2 == IPV6_ADDR_ANY &&
1250 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1251 return 1;
1252
1253 if (addr_type == IPV6_ADDR_ANY &&
1254 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1255 return 1;
1256
1257 if (sk2_rcv_saddr6 &&
1258 ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1259 return 1;
1260
1261 if (addr_type == IPV6_ADDR_MAPPED &&
1262 !sk2_ipv6only &&
1263 (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1264 return 1;
1265
1266 return 0;
1267 }
1268
1269 /* Gets referenced address, destroys ifaddr */
1270
1271 static void addrconf_dad_stop(struct inet6_ifaddr *ifp)
1272 {
1273 if (ifp->flags&IFA_F_PERMANENT) {
1274 spin_lock_bh(&ifp->lock);
1275 addrconf_del_timer(ifp);
1276 ifp->flags |= IFA_F_TENTATIVE;
1277 spin_unlock_bh(&ifp->lock);
1278 in6_ifa_put(ifp);
1279 #ifdef CONFIG_IPV6_PRIVACY
1280 } else if (ifp->flags&IFA_F_TEMPORARY) {
1281 struct inet6_ifaddr *ifpub;
1282 spin_lock_bh(&ifp->lock);
1283 ifpub = ifp->ifpub;
1284 if (ifpub) {
1285 in6_ifa_hold(ifpub);
1286 spin_unlock_bh(&ifp->lock);
1287 ipv6_create_tempaddr(ifpub, ifp);
1288 in6_ifa_put(ifpub);
1289 } else {
1290 spin_unlock_bh(&ifp->lock);
1291 }
1292 ipv6_del_addr(ifp);
1293 #endif
1294 } else
1295 ipv6_del_addr(ifp);
1296 }
1297
1298 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1299 {
1300 if (net_ratelimit())
1301 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1302 addrconf_dad_stop(ifp);
1303 }
1304
1305 /* Join to solicited addr multicast group. */
1306
1307 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1308 {
1309 struct in6_addr maddr;
1310
1311 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1312 return;
1313
1314 addrconf_addr_solict_mult(addr, &maddr);
1315 ipv6_dev_mc_inc(dev, &maddr);
1316 }
1317
1318 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1319 {
1320 struct in6_addr maddr;
1321
1322 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1323 return;
1324
1325 addrconf_addr_solict_mult(addr, &maddr);
1326 __ipv6_dev_mc_dec(idev, &maddr);
1327 }
1328
1329 static void addrconf_join_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_inc(ifp->idev->dev, &addr);
1336 }
1337
1338 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1339 {
1340 struct in6_addr addr;
1341 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1342 if (ipv6_addr_any(&addr))
1343 return;
1344 __ipv6_dev_ac_dec(ifp->idev, &addr);
1345 }
1346
1347 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1348 {
1349 if (dev->addr_len != ETH_ALEN)
1350 return -1;
1351 memcpy(eui, dev->dev_addr, 3);
1352 memcpy(eui + 5, dev->dev_addr + 3, 3);
1353
1354 /*
1355 * The zSeries OSA network cards can be shared among various
1356 * OS instances, but the OSA cards have only one MAC address.
1357 * This leads to duplicate address conflicts in conjunction
1358 * with IPv6 if more than one instance uses the same card.
1359 *
1360 * The driver for these cards can deliver a unique 16-bit
1361 * identifier for each instance sharing the same card. It is
1362 * placed instead of 0xFFFE in the interface identifier. The
1363 * "u" bit of the interface identifier is not inverted in this
1364 * case. Hence the resulting interface identifier has local
1365 * scope according to RFC2373.
1366 */
1367 if (dev->dev_id) {
1368 eui[3] = (dev->dev_id >> 8) & 0xFF;
1369 eui[4] = dev->dev_id & 0xFF;
1370 } else {
1371 eui[3] = 0xFF;
1372 eui[4] = 0xFE;
1373 eui[0] ^= 2;
1374 }
1375 return 0;
1376 }
1377
1378 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1379 {
1380 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1381 if (dev->addr_len != ARCNET_ALEN)
1382 return -1;
1383 memset(eui, 0, 7);
1384 eui[7] = *(u8*)dev->dev_addr;
1385 return 0;
1386 }
1387
1388 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1389 {
1390 if (dev->addr_len != INFINIBAND_ALEN)
1391 return -1;
1392 memcpy(eui, dev->dev_addr + 12, 8);
1393 eui[0] |= 2;
1394 return 0;
1395 }
1396
1397 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1398 {
1399 switch (dev->type) {
1400 case ARPHRD_ETHER:
1401 case ARPHRD_FDDI:
1402 case ARPHRD_IEEE802_TR:
1403 return addrconf_ifid_eui48(eui, dev);
1404 case ARPHRD_ARCNET:
1405 return addrconf_ifid_arcnet(eui, dev);
1406 case ARPHRD_INFINIBAND:
1407 return addrconf_ifid_infiniband(eui, dev);
1408 }
1409 return -1;
1410 }
1411
1412 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1413 {
1414 int err = -1;
1415 struct inet6_ifaddr *ifp;
1416
1417 read_lock_bh(&idev->lock);
1418 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1419 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1420 memcpy(eui, ifp->addr.s6_addr+8, 8);
1421 err = 0;
1422 break;
1423 }
1424 }
1425 read_unlock_bh(&idev->lock);
1426 return err;
1427 }
1428
1429 #ifdef CONFIG_IPV6_PRIVACY
1430 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1431 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1432 {
1433 regen:
1434 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1435 idev->rndid[0] &= ~0x02;
1436
1437 /*
1438 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1439 * check if generated address is not inappropriate
1440 *
1441 * - Reserved subnet anycast (RFC 2526)
1442 * 11111101 11....11 1xxxxxxx
1443 * - ISATAP (draft-ietf-ngtrans-isatap-13.txt) 5.1
1444 * 00-00-5E-FE-xx-xx-xx-xx
1445 * - value 0
1446 * - XXX: already assigned to an address on the device
1447 */
1448 if (idev->rndid[0] == 0xfd &&
1449 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1450 (idev->rndid[7]&0x80))
1451 goto regen;
1452 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1453 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1454 goto regen;
1455 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1456 goto regen;
1457 }
1458
1459 return 0;
1460 }
1461
1462 static void ipv6_regen_rndid(unsigned long data)
1463 {
1464 struct inet6_dev *idev = (struct inet6_dev *) data;
1465 unsigned long expires;
1466
1467 read_lock_bh(&addrconf_lock);
1468 write_lock_bh(&idev->lock);
1469
1470 if (idev->dead)
1471 goto out;
1472
1473 if (__ipv6_regen_rndid(idev) < 0)
1474 goto out;
1475
1476 expires = jiffies +
1477 idev->cnf.temp_prefered_lft * HZ -
1478 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1479 if (time_before(expires, jiffies)) {
1480 printk(KERN_WARNING
1481 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1482 idev->dev->name);
1483 goto out;
1484 }
1485
1486 if (!mod_timer(&idev->regen_timer, expires))
1487 in6_dev_hold(idev);
1488
1489 out:
1490 write_unlock_bh(&idev->lock);
1491 read_unlock_bh(&addrconf_lock);
1492 in6_dev_put(idev);
1493 }
1494
1495 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1496 int ret = 0;
1497
1498 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1499 ret = __ipv6_regen_rndid(idev);
1500 return ret;
1501 }
1502 #endif
1503
1504 /*
1505 * Add prefix route.
1506 */
1507
1508 static void
1509 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1510 unsigned long expires, u32 flags)
1511 {
1512 struct in6_rtmsg rtmsg;
1513
1514 memset(&rtmsg, 0, sizeof(rtmsg));
1515 ipv6_addr_copy(&rtmsg.rtmsg_dst, pfx);
1516 rtmsg.rtmsg_dst_len = plen;
1517 rtmsg.rtmsg_metric = IP6_RT_PRIO_ADDRCONF;
1518 rtmsg.rtmsg_ifindex = dev->ifindex;
1519 rtmsg.rtmsg_info = expires;
1520 rtmsg.rtmsg_flags = RTF_UP|flags;
1521 rtmsg.rtmsg_type = RTMSG_NEWROUTE;
1522
1523 /* Prevent useless cloning on PtP SIT.
1524 This thing is done here expecting that the whole
1525 class of non-broadcast devices need not cloning.
1526 */
1527 if (dev->type == ARPHRD_SIT && (dev->flags&IFF_POINTOPOINT))
1528 rtmsg.rtmsg_flags |= RTF_NONEXTHOP;
1529
1530 ip6_route_add(&rtmsg, NULL, NULL, NULL, RT6_TABLE_PREFIX);
1531 }
1532
1533 /* Create "default" multicast route to the interface */
1534
1535 static void addrconf_add_mroute(struct net_device *dev)
1536 {
1537 struct in6_rtmsg rtmsg;
1538
1539 memset(&rtmsg, 0, sizeof(rtmsg));
1540 ipv6_addr_set(&rtmsg.rtmsg_dst,
1541 htonl(0xFF000000), 0, 0, 0);
1542 rtmsg.rtmsg_dst_len = 8;
1543 rtmsg.rtmsg_metric = IP6_RT_PRIO_ADDRCONF;
1544 rtmsg.rtmsg_ifindex = dev->ifindex;
1545 rtmsg.rtmsg_flags = RTF_UP;
1546 rtmsg.rtmsg_type = RTMSG_NEWROUTE;
1547 ip6_route_add(&rtmsg, NULL, NULL, NULL, RT6_TABLE_LOCAL);
1548 }
1549
1550 static void sit_route_add(struct net_device *dev)
1551 {
1552 struct in6_rtmsg rtmsg;
1553
1554 memset(&rtmsg, 0, sizeof(rtmsg));
1555
1556 rtmsg.rtmsg_type = RTMSG_NEWROUTE;
1557 rtmsg.rtmsg_metric = IP6_RT_PRIO_ADDRCONF;
1558
1559 /* prefix length - 96 bits "::d.d.d.d" */
1560 rtmsg.rtmsg_dst_len = 96;
1561 rtmsg.rtmsg_flags = RTF_UP|RTF_NONEXTHOP;
1562 rtmsg.rtmsg_ifindex = dev->ifindex;
1563
1564 ip6_route_add(&rtmsg, NULL, NULL, NULL, RT6_TABLE_MAIN);
1565 }
1566
1567 static void addrconf_add_lroute(struct net_device *dev)
1568 {
1569 struct in6_addr addr;
1570
1571 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1572 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1573 }
1574
1575 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1576 {
1577 struct inet6_dev *idev;
1578
1579 ASSERT_RTNL();
1580
1581 if ((idev = ipv6_find_idev(dev)) == NULL)
1582 return NULL;
1583
1584 /* Add default multicast route */
1585 addrconf_add_mroute(dev);
1586
1587 /* Add link local route */
1588 addrconf_add_lroute(dev);
1589 return idev;
1590 }
1591
1592 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1593 {
1594 struct prefix_info *pinfo;
1595 __u32 valid_lft;
1596 __u32 prefered_lft;
1597 int addr_type;
1598 unsigned long rt_expires;
1599 struct inet6_dev *in6_dev;
1600
1601 pinfo = (struct prefix_info *) opt;
1602
1603 if (len < sizeof(struct prefix_info)) {
1604 ADBG(("addrconf: prefix option too short\n"));
1605 return;
1606 }
1607
1608 /*
1609 * Validation checks ([ADDRCONF], page 19)
1610 */
1611
1612 addr_type = ipv6_addr_type(&pinfo->prefix);
1613
1614 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1615 return;
1616
1617 valid_lft = ntohl(pinfo->valid);
1618 prefered_lft = ntohl(pinfo->prefered);
1619
1620 if (prefered_lft > valid_lft) {
1621 if (net_ratelimit())
1622 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1623 return;
1624 }
1625
1626 in6_dev = in6_dev_get(dev);
1627
1628 if (in6_dev == NULL) {
1629 if (net_ratelimit())
1630 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1631 return;
1632 }
1633
1634 /*
1635 * Two things going on here:
1636 * 1) Add routes for on-link prefixes
1637 * 2) Configure prefixes with the auto flag set
1638 */
1639
1640 /* Avoid arithmetic overflow. Really, we could
1641 save rt_expires in seconds, likely valid_lft,
1642 but it would require division in fib gc, that it
1643 not good.
1644 */
1645 if (valid_lft >= 0x7FFFFFFF/HZ)
1646 rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ);
1647 else
1648 rt_expires = valid_lft * HZ;
1649
1650 /*
1651 * We convert this (in jiffies) to clock_t later.
1652 * Avoid arithmetic overflow there as well.
1653 * Overflow can happen only if HZ < USER_HZ.
1654 */
1655 if (HZ < USER_HZ && rt_expires > 0x7FFFFFFF / USER_HZ)
1656 rt_expires = 0x7FFFFFFF / USER_HZ;
1657
1658 if (pinfo->onlink) {
1659 struct rt6_info *rt;
1660 rt = rt6_lookup(&pinfo->prefix, NULL, dev->ifindex, 1);
1661
1662 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
1663 if (rt->rt6i_flags&RTF_EXPIRES) {
1664 if (valid_lft == 0) {
1665 ip6_del_rt(rt, NULL, NULL, NULL);
1666 rt = NULL;
1667 } else {
1668 rt->rt6i_expires = jiffies + rt_expires;
1669 }
1670 }
1671 } else if (valid_lft) {
1672 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1673 dev, jiffies_to_clock_t(rt_expires), RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT);
1674 }
1675 if (rt)
1676 dst_release(&rt->u.dst);
1677 }
1678
1679 /* Try to figure out our local address for this prefix */
1680
1681 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1682 struct inet6_ifaddr * ifp;
1683 struct in6_addr addr;
1684 int create = 0, update_lft = 0;
1685
1686 if (pinfo->prefix_len == 64) {
1687 memcpy(&addr, &pinfo->prefix, 8);
1688 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1689 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1690 in6_dev_put(in6_dev);
1691 return;
1692 }
1693 goto ok;
1694 }
1695 if (net_ratelimit())
1696 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1697 pinfo->prefix_len);
1698 in6_dev_put(in6_dev);
1699 return;
1700
1701 ok:
1702
1703 ifp = ipv6_get_ifaddr(&addr, dev, 1);
1704
1705 if (ifp == NULL && valid_lft) {
1706 int max_addresses = in6_dev->cnf.max_addresses;
1707
1708 /* Do not allow to create too much of autoconfigured
1709 * addresses; this would be too easy way to crash kernel.
1710 */
1711 if (!max_addresses ||
1712 ipv6_count_addresses(in6_dev) < max_addresses)
1713 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1714 addr_type&IPV6_ADDR_SCOPE_MASK, 0);
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 (dev->type == ARPHRD_SIT) {
1837 struct ifreq ifr;
1838 mm_segment_t oldfs;
1839 struct ip_tunnel_parm p;
1840
1841 err = -EADDRNOTAVAIL;
1842 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
1843 goto err_exit;
1844
1845 memset(&p, 0, sizeof(p));
1846 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
1847 p.iph.saddr = 0;
1848 p.iph.version = 4;
1849 p.iph.ihl = 5;
1850 p.iph.protocol = IPPROTO_IPV6;
1851 p.iph.ttl = 64;
1852 ifr.ifr_ifru.ifru_data = (void __user *)&p;
1853
1854 oldfs = get_fs(); set_fs(KERNEL_DS);
1855 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
1856 set_fs(oldfs);
1857
1858 if (err == 0) {
1859 err = -ENOBUFS;
1860 if ((dev = __dev_get_by_name(p.name)) == NULL)
1861 goto err_exit;
1862 err = dev_open(dev);
1863 }
1864 }
1865
1866 err_exit:
1867 rtnl_unlock();
1868 return err;
1869 }
1870
1871 /*
1872 * Manual configuration of address on an interface
1873 */
1874 static int inet6_addr_add(int ifindex, struct in6_addr *pfx, int plen,
1875 __u32 prefered_lft, __u32 valid_lft)
1876 {
1877 struct inet6_ifaddr *ifp;
1878 struct inet6_dev *idev;
1879 struct net_device *dev;
1880 __u8 ifa_flags = 0;
1881 int scope;
1882
1883 ASSERT_RTNL();
1884
1885 /* check the lifetime */
1886 if (!valid_lft || prefered_lft > valid_lft)
1887 return -EINVAL;
1888
1889 if ((dev = __dev_get_by_index(ifindex)) == NULL)
1890 return -ENODEV;
1891
1892 if (!(dev->flags&IFF_UP))
1893 return -ENETDOWN;
1894
1895 if ((idev = addrconf_add_dev(dev)) == NULL)
1896 return -ENOBUFS;
1897
1898 scope = ipv6_addr_scope(pfx);
1899
1900 if (valid_lft == INFINITY_LIFE_TIME)
1901 ifa_flags |= IFA_F_PERMANENT;
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_dad_start(ifp, 0);
1921 in6_ifa_put(ifp);
1922 addrconf_verify(0);
1923 return 0;
1924 }
1925
1926 return PTR_ERR(ifp);
1927 }
1928
1929 static int inet6_addr_del(int ifindex, struct in6_addr *pfx, int plen)
1930 {
1931 struct inet6_ifaddr *ifp;
1932 struct inet6_dev *idev;
1933 struct net_device *dev;
1934
1935 if ((dev = __dev_get_by_index(ifindex)) == NULL)
1936 return -ENODEV;
1937
1938 if ((idev = __in6_dev_get(dev)) == NULL)
1939 return -ENXIO;
1940
1941 read_lock_bh(&idev->lock);
1942 for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
1943 if (ifp->prefix_len == plen &&
1944 ipv6_addr_equal(pfx, &ifp->addr)) {
1945 in6_ifa_hold(ifp);
1946 read_unlock_bh(&idev->lock);
1947
1948 ipv6_del_addr(ifp);
1949
1950 /* If the last address is deleted administratively,
1951 disable IPv6 on this interface.
1952 */
1953 if (idev->addr_list == NULL)
1954 addrconf_ifdown(idev->dev, 1);
1955 return 0;
1956 }
1957 }
1958 read_unlock_bh(&idev->lock);
1959 return -EADDRNOTAVAIL;
1960 }
1961
1962
1963 int addrconf_add_ifaddr(void __user *arg)
1964 {
1965 struct in6_ifreq ireq;
1966 int err;
1967
1968 if (!capable(CAP_NET_ADMIN))
1969 return -EPERM;
1970
1971 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1972 return -EFAULT;
1973
1974 rtnl_lock();
1975 err = inet6_addr_add(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen,
1976 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1977 rtnl_unlock();
1978 return err;
1979 }
1980
1981 int addrconf_del_ifaddr(void __user *arg)
1982 {
1983 struct in6_ifreq ireq;
1984 int err;
1985
1986 if (!capable(CAP_NET_ADMIN))
1987 return -EPERM;
1988
1989 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1990 return -EFAULT;
1991
1992 rtnl_lock();
1993 err = inet6_addr_del(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
1994 rtnl_unlock();
1995 return err;
1996 }
1997
1998 static void sit_add_v4_addrs(struct inet6_dev *idev)
1999 {
2000 struct inet6_ifaddr * ifp;
2001 struct in6_addr addr;
2002 struct net_device *dev;
2003 int scope;
2004
2005 ASSERT_RTNL();
2006
2007 memset(&addr, 0, sizeof(struct in6_addr));
2008 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2009
2010 if (idev->dev->flags&IFF_POINTOPOINT) {
2011 addr.s6_addr32[0] = htonl(0xfe800000);
2012 scope = IFA_LINK;
2013 } else {
2014 scope = IPV6_ADDR_COMPATv4;
2015 }
2016
2017 if (addr.s6_addr32[3]) {
2018 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
2019 if (!IS_ERR(ifp)) {
2020 spin_lock_bh(&ifp->lock);
2021 ifp->flags &= ~IFA_F_TENTATIVE;
2022 spin_unlock_bh(&ifp->lock);
2023 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2024 in6_ifa_put(ifp);
2025 }
2026 return;
2027 }
2028
2029 for (dev = dev_base; dev != NULL; dev = dev->next) {
2030 struct in_device * in_dev = __in_dev_get_rtnl(dev);
2031 if (in_dev && (dev->flags & IFF_UP)) {
2032 struct in_ifaddr * ifa;
2033
2034 int flag = scope;
2035
2036 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2037 int plen;
2038
2039 addr.s6_addr32[3] = ifa->ifa_local;
2040
2041 if (ifa->ifa_scope == RT_SCOPE_LINK)
2042 continue;
2043 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2044 if (idev->dev->flags&IFF_POINTOPOINT)
2045 continue;
2046 flag |= IFA_HOST;
2047 }
2048 if (idev->dev->flags&IFF_POINTOPOINT)
2049 plen = 64;
2050 else
2051 plen = 96;
2052
2053 ifp = ipv6_add_addr(idev, &addr, plen, flag,
2054 IFA_F_PERMANENT);
2055 if (!IS_ERR(ifp)) {
2056 spin_lock_bh(&ifp->lock);
2057 ifp->flags &= ~IFA_F_TENTATIVE;
2058 spin_unlock_bh(&ifp->lock);
2059 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2060 in6_ifa_put(ifp);
2061 }
2062 }
2063 }
2064 }
2065 }
2066
2067 static void init_loopback(struct net_device *dev)
2068 {
2069 struct inet6_dev *idev;
2070 struct inet6_ifaddr * ifp;
2071
2072 /* ::1 */
2073
2074 ASSERT_RTNL();
2075
2076 if ((idev = ipv6_find_idev(dev)) == NULL) {
2077 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2078 return;
2079 }
2080
2081 ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
2082 if (!IS_ERR(ifp)) {
2083 spin_lock_bh(&ifp->lock);
2084 ifp->flags &= ~IFA_F_TENTATIVE;
2085 spin_unlock_bh(&ifp->lock);
2086 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2087 in6_ifa_put(ifp);
2088 }
2089 }
2090
2091 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2092 {
2093 struct inet6_ifaddr * ifp;
2094
2095 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, IFA_F_PERMANENT);
2096 if (!IS_ERR(ifp)) {
2097 addrconf_dad_start(ifp, 0);
2098 in6_ifa_put(ifp);
2099 }
2100 }
2101
2102 static void addrconf_dev_config(struct net_device *dev)
2103 {
2104 struct in6_addr addr;
2105 struct inet6_dev * idev;
2106
2107 ASSERT_RTNL();
2108
2109 if ((dev->type != ARPHRD_ETHER) &&
2110 (dev->type != ARPHRD_FDDI) &&
2111 (dev->type != ARPHRD_IEEE802_TR) &&
2112 (dev->type != ARPHRD_ARCNET) &&
2113 (dev->type != ARPHRD_INFINIBAND)) {
2114 /* Alas, we support only Ethernet autoconfiguration. */
2115 return;
2116 }
2117
2118 idev = addrconf_add_dev(dev);
2119 if (idev == NULL)
2120 return;
2121
2122 memset(&addr, 0, sizeof(struct in6_addr));
2123 addr.s6_addr32[0] = htonl(0xFE800000);
2124
2125 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2126 addrconf_add_linklocal(idev, &addr);
2127 }
2128
2129 static void addrconf_sit_config(struct net_device *dev)
2130 {
2131 struct inet6_dev *idev;
2132
2133 ASSERT_RTNL();
2134
2135 /*
2136 * Configure the tunnel with one of our IPv4
2137 * addresses... we should configure all of
2138 * our v4 addrs in the tunnel
2139 */
2140
2141 if ((idev = ipv6_find_idev(dev)) == NULL) {
2142 printk(KERN_DEBUG "init sit: add_dev failed\n");
2143 return;
2144 }
2145
2146 sit_add_v4_addrs(idev);
2147
2148 if (dev->flags&IFF_POINTOPOINT) {
2149 addrconf_add_mroute(dev);
2150 addrconf_add_lroute(dev);
2151 } else
2152 sit_route_add(dev);
2153 }
2154
2155 static inline int
2156 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2157 {
2158 struct in6_addr lladdr;
2159
2160 if (!ipv6_get_lladdr(link_dev, &lladdr)) {
2161 addrconf_add_linklocal(idev, &lladdr);
2162 return 0;
2163 }
2164 return -1;
2165 }
2166
2167 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2168 {
2169 struct net_device *link_dev;
2170
2171 /* first try to inherit the link-local address from the link device */
2172 if (idev->dev->iflink &&
2173 (link_dev = __dev_get_by_index(idev->dev->iflink))) {
2174 if (!ipv6_inherit_linklocal(idev, link_dev))
2175 return;
2176 }
2177 /* then try to inherit it from any device */
2178 for (link_dev = dev_base; link_dev; link_dev = link_dev->next) {
2179 if (!ipv6_inherit_linklocal(idev, link_dev))
2180 return;
2181 }
2182 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2183 }
2184
2185 /*
2186 * Autoconfigure tunnel with a link-local address so routing protocols,
2187 * DHCPv6, MLD etc. can be run over the virtual link
2188 */
2189
2190 static void addrconf_ip6_tnl_config(struct net_device *dev)
2191 {
2192 struct inet6_dev *idev;
2193
2194 ASSERT_RTNL();
2195
2196 if ((idev = addrconf_add_dev(dev)) == NULL) {
2197 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2198 return;
2199 }
2200 ip6_tnl_add_linklocal(idev);
2201 }
2202
2203 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2204 void * data)
2205 {
2206 struct net_device *dev = (struct net_device *) data;
2207 struct inet6_dev *idev = __in6_dev_get(dev);
2208 int run_pending = 0;
2209
2210 switch(event) {
2211 case NETDEV_UP:
2212 case NETDEV_CHANGE:
2213 if (event == NETDEV_UP) {
2214 if (!netif_carrier_ok(dev)) {
2215 /* device is not ready yet. */
2216 printk(KERN_INFO
2217 "ADDRCONF(NETDEV_UP): %s: "
2218 "link is not ready\n",
2219 dev->name);
2220 break;
2221 }
2222
2223 if (idev)
2224 idev->if_flags |= IF_READY;
2225 } else {
2226 if (!netif_carrier_ok(dev)) {
2227 /* device is still not ready. */
2228 break;
2229 }
2230
2231 if (idev) {
2232 if (idev->if_flags & IF_READY) {
2233 /* device is already configured. */
2234 break;
2235 }
2236 idev->if_flags |= IF_READY;
2237 }
2238
2239 printk(KERN_INFO
2240 "ADDRCONF(NETDEV_CHANGE): %s: "
2241 "link becomes ready\n",
2242 dev->name);
2243
2244 run_pending = 1;
2245 }
2246
2247 switch(dev->type) {
2248 case ARPHRD_SIT:
2249 addrconf_sit_config(dev);
2250 break;
2251 case ARPHRD_TUNNEL6:
2252 addrconf_ip6_tnl_config(dev);
2253 break;
2254 case ARPHRD_LOOPBACK:
2255 init_loopback(dev);
2256 break;
2257
2258 default:
2259 addrconf_dev_config(dev);
2260 break;
2261 };
2262 if (idev) {
2263 if (run_pending)
2264 addrconf_dad_run(idev);
2265
2266 /* If the MTU changed during the interface down, when the
2267 interface up, the changed MTU must be reflected in the
2268 idev as well as routers.
2269 */
2270 if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2271 rt6_mtu_change(dev, dev->mtu);
2272 idev->cnf.mtu6 = dev->mtu;
2273 }
2274 idev->tstamp = jiffies;
2275 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2276 /* If the changed mtu during down is lower than IPV6_MIN_MTU
2277 stop IPv6 on this interface.
2278 */
2279 if (dev->mtu < IPV6_MIN_MTU)
2280 addrconf_ifdown(dev, event != NETDEV_DOWN);
2281 }
2282 break;
2283
2284 case NETDEV_CHANGEMTU:
2285 if ( idev && dev->mtu >= IPV6_MIN_MTU) {
2286 rt6_mtu_change(dev, dev->mtu);
2287 idev->cnf.mtu6 = dev->mtu;
2288 break;
2289 }
2290
2291 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2292
2293 case NETDEV_DOWN:
2294 case NETDEV_UNREGISTER:
2295 /*
2296 * Remove all addresses from this interface.
2297 */
2298 addrconf_ifdown(dev, event != NETDEV_DOWN);
2299 break;
2300
2301 case NETDEV_CHANGENAME:
2302 #ifdef CONFIG_SYSCTL
2303 if (idev) {
2304 addrconf_sysctl_unregister(&idev->cnf);
2305 neigh_sysctl_unregister(idev->nd_parms);
2306 neigh_sysctl_register(dev, idev->nd_parms,
2307 NET_IPV6, NET_IPV6_NEIGH, "ipv6",
2308 &ndisc_ifinfo_sysctl_change,
2309 NULL);
2310 addrconf_sysctl_register(idev, &idev->cnf);
2311 }
2312 #endif
2313 break;
2314 };
2315
2316 return NOTIFY_OK;
2317 }
2318
2319 /*
2320 * addrconf module should be notified of a device going up
2321 */
2322 static struct notifier_block ipv6_dev_notf = {
2323 .notifier_call = addrconf_notify,
2324 .priority = 0
2325 };
2326
2327 static int addrconf_ifdown(struct net_device *dev, int how)
2328 {
2329 struct inet6_dev *idev;
2330 struct inet6_ifaddr *ifa, **bifa;
2331 int i;
2332
2333 ASSERT_RTNL();
2334
2335 if (dev == &loopback_dev && how == 1)
2336 how = 0;
2337
2338 rt6_ifdown(dev);
2339 neigh_ifdown(&nd_tbl, dev);
2340
2341 idev = __in6_dev_get(dev);
2342 if (idev == NULL)
2343 return -ENODEV;
2344
2345 /* Step 1: remove reference to ipv6 device from parent device.
2346 Do not dev_put!
2347 */
2348 if (how == 1) {
2349 write_lock_bh(&addrconf_lock);
2350 dev->ip6_ptr = NULL;
2351 idev->dead = 1;
2352 write_unlock_bh(&addrconf_lock);
2353
2354 /* Step 1.5: remove snmp6 entry */
2355 snmp6_unregister_dev(idev);
2356
2357 }
2358
2359 /* Step 2: clear hash table */
2360 for (i=0; i<IN6_ADDR_HSIZE; i++) {
2361 bifa = &inet6_addr_lst[i];
2362
2363 write_lock_bh(&addrconf_hash_lock);
2364 while ((ifa = *bifa) != NULL) {
2365 if (ifa->idev == idev) {
2366 *bifa = ifa->lst_next;
2367 ifa->lst_next = NULL;
2368 addrconf_del_timer(ifa);
2369 in6_ifa_put(ifa);
2370 continue;
2371 }
2372 bifa = &ifa->lst_next;
2373 }
2374 write_unlock_bh(&addrconf_hash_lock);
2375 }
2376
2377 write_lock_bh(&idev->lock);
2378
2379 /* Step 3: clear flags for stateless addrconf */
2380 if (how != 1)
2381 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2382
2383 /* Step 4: clear address list */
2384 #ifdef CONFIG_IPV6_PRIVACY
2385 if (how == 1 && del_timer(&idev->regen_timer))
2386 in6_dev_put(idev);
2387
2388 /* clear tempaddr list */
2389 while ((ifa = idev->tempaddr_list) != NULL) {
2390 idev->tempaddr_list = ifa->tmp_next;
2391 ifa->tmp_next = NULL;
2392 ifa->dead = 1;
2393 write_unlock_bh(&idev->lock);
2394 spin_lock_bh(&ifa->lock);
2395
2396 if (ifa->ifpub) {
2397 in6_ifa_put(ifa->ifpub);
2398 ifa->ifpub = NULL;
2399 }
2400 spin_unlock_bh(&ifa->lock);
2401 in6_ifa_put(ifa);
2402 write_lock_bh(&idev->lock);
2403 }
2404 #endif
2405 while ((ifa = idev->addr_list) != NULL) {
2406 idev->addr_list = ifa->if_next;
2407 ifa->if_next = NULL;
2408 ifa->dead = 1;
2409 addrconf_del_timer(ifa);
2410 write_unlock_bh(&idev->lock);
2411
2412 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2413 in6_ifa_put(ifa);
2414
2415 write_lock_bh(&idev->lock);
2416 }
2417 write_unlock_bh(&idev->lock);
2418
2419 /* Step 5: Discard multicast list */
2420
2421 if (how == 1)
2422 ipv6_mc_destroy_dev(idev);
2423 else
2424 ipv6_mc_down(idev);
2425
2426 /* Step 5: netlink notification of this interface */
2427 idev->tstamp = jiffies;
2428 inet6_ifinfo_notify(RTM_DELLINK, idev);
2429
2430 /* Shot the device (if unregistered) */
2431
2432 if (how == 1) {
2433 #ifdef CONFIG_SYSCTL
2434 addrconf_sysctl_unregister(&idev->cnf);
2435 neigh_sysctl_unregister(idev->nd_parms);
2436 #endif
2437 neigh_parms_release(&nd_tbl, idev->nd_parms);
2438 neigh_ifdown(&nd_tbl, dev);
2439 in6_dev_put(idev);
2440 }
2441 return 0;
2442 }
2443
2444 static void addrconf_rs_timer(unsigned long data)
2445 {
2446 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2447
2448 if (ifp->idev->cnf.forwarding)
2449 goto out;
2450
2451 if (ifp->idev->if_flags & IF_RA_RCVD) {
2452 /*
2453 * Announcement received after solicitation
2454 * was sent
2455 */
2456 goto out;
2457 }
2458
2459 spin_lock(&ifp->lock);
2460 if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2461 struct in6_addr all_routers;
2462
2463 /* The wait after the last probe can be shorter */
2464 addrconf_mod_timer(ifp, AC_RS,
2465 (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2466 ifp->idev->cnf.rtr_solicit_delay :
2467 ifp->idev->cnf.rtr_solicit_interval);
2468 spin_unlock(&ifp->lock);
2469
2470 ipv6_addr_all_routers(&all_routers);
2471
2472 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2473 } else {
2474 spin_unlock(&ifp->lock);
2475 /*
2476 * Note: we do not support deprecated "all on-link"
2477 * assumption any longer.
2478 */
2479 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2480 ifp->idev->dev->name);
2481 }
2482
2483 out:
2484 in6_ifa_put(ifp);
2485 }
2486
2487 /*
2488 * Duplicate Address Detection
2489 */
2490 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2491 {
2492 unsigned long rand_num;
2493 struct inet6_dev *idev = ifp->idev;
2494
2495 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2496 ifp->probes = idev->cnf.dad_transmits;
2497 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2498 }
2499
2500 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2501 {
2502 struct inet6_dev *idev = ifp->idev;
2503 struct net_device *dev = idev->dev;
2504
2505 addrconf_join_solict(dev, &ifp->addr);
2506
2507 if (ifp->prefix_len != 128 && (ifp->flags&IFA_F_PERMANENT))
2508 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 0,
2509 flags);
2510
2511 net_srandom(ifp->addr.s6_addr32[3]);
2512
2513 read_lock_bh(&idev->lock);
2514 if (ifp->dead)
2515 goto out;
2516 spin_lock_bh(&ifp->lock);
2517
2518 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2519 !(ifp->flags&IFA_F_TENTATIVE)) {
2520 ifp->flags &= ~IFA_F_TENTATIVE;
2521 spin_unlock_bh(&ifp->lock);
2522 read_unlock_bh(&idev->lock);
2523
2524 addrconf_dad_completed(ifp);
2525 return;
2526 }
2527
2528 if (!(idev->if_flags & IF_READY)) {
2529 spin_unlock_bh(&ifp->lock);
2530 read_unlock_bh(&idev->lock);
2531 /*
2532 * If the defice is not ready:
2533 * - keep it tentative if it is a permanent address.
2534 * - otherwise, kill it.
2535 */
2536 in6_ifa_hold(ifp);
2537 addrconf_dad_stop(ifp);
2538 return;
2539 }
2540 addrconf_dad_kick(ifp);
2541 spin_unlock_bh(&ifp->lock);
2542 out:
2543 read_unlock_bh(&idev->lock);
2544 }
2545
2546 static void addrconf_dad_timer(unsigned long data)
2547 {
2548 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2549 struct inet6_dev *idev = ifp->idev;
2550 struct in6_addr unspec;
2551 struct in6_addr mcaddr;
2552
2553 read_lock_bh(&idev->lock);
2554 if (idev->dead) {
2555 read_unlock_bh(&idev->lock);
2556 goto out;
2557 }
2558 spin_lock_bh(&ifp->lock);
2559 if (ifp->probes == 0) {
2560 /*
2561 * DAD was successful
2562 */
2563
2564 ifp->flags &= ~IFA_F_TENTATIVE;
2565 spin_unlock_bh(&ifp->lock);
2566 read_unlock_bh(&idev->lock);
2567
2568 addrconf_dad_completed(ifp);
2569
2570 goto out;
2571 }
2572
2573 ifp->probes--;
2574 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2575 spin_unlock_bh(&ifp->lock);
2576 read_unlock_bh(&idev->lock);
2577
2578 /* send a neighbour solicitation for our addr */
2579 memset(&unspec, 0, sizeof(unspec));
2580 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2581 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec);
2582 out:
2583 in6_ifa_put(ifp);
2584 }
2585
2586 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2587 {
2588 struct net_device * dev = ifp->idev->dev;
2589
2590 /*
2591 * Configure the address for reception. Now it is valid.
2592 */
2593
2594 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2595
2596 /* If added prefix is link local and forwarding is off,
2597 start sending router solicitations.
2598 */
2599
2600 if (ifp->idev->cnf.forwarding == 0 &&
2601 ifp->idev->cnf.rtr_solicits > 0 &&
2602 (dev->flags&IFF_LOOPBACK) == 0 &&
2603 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2604 struct in6_addr all_routers;
2605
2606 ipv6_addr_all_routers(&all_routers);
2607
2608 /*
2609 * If a host as already performed a random delay
2610 * [...] as part of DAD [...] there is no need
2611 * to delay again before sending the first RS
2612 */
2613 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2614
2615 spin_lock_bh(&ifp->lock);
2616 ifp->probes = 1;
2617 ifp->idev->if_flags |= IF_RS_SENT;
2618 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2619 spin_unlock_bh(&ifp->lock);
2620 }
2621 }
2622
2623 static void addrconf_dad_run(struct inet6_dev *idev) {
2624 struct inet6_ifaddr *ifp;
2625
2626 read_lock_bh(&idev->lock);
2627 for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2628 spin_lock_bh(&ifp->lock);
2629 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2630 spin_unlock_bh(&ifp->lock);
2631 continue;
2632 }
2633 spin_unlock_bh(&ifp->lock);
2634 addrconf_dad_kick(ifp);
2635 }
2636 read_unlock_bh(&idev->lock);
2637 }
2638
2639 #ifdef CONFIG_PROC_FS
2640 struct if6_iter_state {
2641 int bucket;
2642 };
2643
2644 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2645 {
2646 struct inet6_ifaddr *ifa = NULL;
2647 struct if6_iter_state *state = seq->private;
2648
2649 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2650 ifa = inet6_addr_lst[state->bucket];
2651 if (ifa)
2652 break;
2653 }
2654 return ifa;
2655 }
2656
2657 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2658 {
2659 struct if6_iter_state *state = seq->private;
2660
2661 ifa = ifa->lst_next;
2662 try_again:
2663 if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2664 ifa = inet6_addr_lst[state->bucket];
2665 goto try_again;
2666 }
2667 return ifa;
2668 }
2669
2670 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2671 {
2672 struct inet6_ifaddr *ifa = if6_get_first(seq);
2673
2674 if (ifa)
2675 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2676 --pos;
2677 return pos ? NULL : ifa;
2678 }
2679
2680 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2681 {
2682 read_lock_bh(&addrconf_hash_lock);
2683 return if6_get_idx(seq, *pos);
2684 }
2685
2686 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2687 {
2688 struct inet6_ifaddr *ifa;
2689
2690 ifa = if6_get_next(seq, v);
2691 ++*pos;
2692 return ifa;
2693 }
2694
2695 static void if6_seq_stop(struct seq_file *seq, void *v)
2696 {
2697 read_unlock_bh(&addrconf_hash_lock);
2698 }
2699
2700 static int if6_seq_show(struct seq_file *seq, void *v)
2701 {
2702 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2703 seq_printf(seq,
2704 NIP6_SEQFMT " %02x %02x %02x %02x %8s\n",
2705 NIP6(ifp->addr),
2706 ifp->idev->dev->ifindex,
2707 ifp->prefix_len,
2708 ifp->scope,
2709 ifp->flags,
2710 ifp->idev->dev->name);
2711 return 0;
2712 }
2713
2714 static struct seq_operations if6_seq_ops = {
2715 .start = if6_seq_start,
2716 .next = if6_seq_next,
2717 .show = if6_seq_show,
2718 .stop = if6_seq_stop,
2719 };
2720
2721 static int if6_seq_open(struct inode *inode, struct file *file)
2722 {
2723 struct seq_file *seq;
2724 int rc = -ENOMEM;
2725 struct if6_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL);
2726
2727 if (!s)
2728 goto out;
2729
2730 rc = seq_open(file, &if6_seq_ops);
2731 if (rc)
2732 goto out_kfree;
2733
2734 seq = file->private_data;
2735 seq->private = s;
2736 out:
2737 return rc;
2738 out_kfree:
2739 kfree(s);
2740 goto out;
2741 }
2742
2743 static struct file_operations if6_fops = {
2744 .owner = THIS_MODULE,
2745 .open = if6_seq_open,
2746 .read = seq_read,
2747 .llseek = seq_lseek,
2748 .release = seq_release_private,
2749 };
2750
2751 int __init if6_proc_init(void)
2752 {
2753 if (!proc_net_fops_create("if_inet6", S_IRUGO, &if6_fops))
2754 return -ENOMEM;
2755 return 0;
2756 }
2757
2758 void if6_proc_exit(void)
2759 {
2760 proc_net_remove("if_inet6");
2761 }
2762 #endif /* CONFIG_PROC_FS */
2763
2764 /*
2765 * Periodic address status verification
2766 */
2767
2768 static void addrconf_verify(unsigned long foo)
2769 {
2770 struct inet6_ifaddr *ifp;
2771 unsigned long now, next;
2772 int i;
2773
2774 spin_lock_bh(&addrconf_verify_lock);
2775 now = jiffies;
2776 next = now + ADDR_CHECK_FREQUENCY;
2777
2778 del_timer(&addr_chk_timer);
2779
2780 for (i=0; i < IN6_ADDR_HSIZE; i++) {
2781
2782 restart:
2783 read_lock(&addrconf_hash_lock);
2784 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
2785 unsigned long age;
2786 #ifdef CONFIG_IPV6_PRIVACY
2787 unsigned long regen_advance;
2788 #endif
2789
2790 if (ifp->flags & IFA_F_PERMANENT)
2791 continue;
2792
2793 spin_lock(&ifp->lock);
2794 age = (now - ifp->tstamp) / HZ;
2795
2796 #ifdef CONFIG_IPV6_PRIVACY
2797 regen_advance = ifp->idev->cnf.regen_max_retry *
2798 ifp->idev->cnf.dad_transmits *
2799 ifp->idev->nd_parms->retrans_time / HZ;
2800 #endif
2801
2802 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
2803 age >= ifp->valid_lft) {
2804 spin_unlock(&ifp->lock);
2805 in6_ifa_hold(ifp);
2806 read_unlock(&addrconf_hash_lock);
2807 ipv6_del_addr(ifp);
2808 goto restart;
2809 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
2810 spin_unlock(&ifp->lock);
2811 continue;
2812 } else if (age >= ifp->prefered_lft) {
2813 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
2814 int deprecate = 0;
2815
2816 if (!(ifp->flags&IFA_F_DEPRECATED)) {
2817 deprecate = 1;
2818 ifp->flags |= IFA_F_DEPRECATED;
2819 }
2820
2821 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
2822 next = ifp->tstamp + ifp->valid_lft * HZ;
2823
2824 spin_unlock(&ifp->lock);
2825
2826 if (deprecate) {
2827 in6_ifa_hold(ifp);
2828 read_unlock(&addrconf_hash_lock);
2829
2830 ipv6_ifa_notify(0, ifp);
2831 in6_ifa_put(ifp);
2832 goto restart;
2833 }
2834 #ifdef CONFIG_IPV6_PRIVACY
2835 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
2836 !(ifp->flags&IFA_F_TENTATIVE)) {
2837 if (age >= ifp->prefered_lft - regen_advance) {
2838 struct inet6_ifaddr *ifpub = ifp->ifpub;
2839 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2840 next = ifp->tstamp + ifp->prefered_lft * HZ;
2841 if (!ifp->regen_count && ifpub) {
2842 ifp->regen_count++;
2843 in6_ifa_hold(ifp);
2844 in6_ifa_hold(ifpub);
2845 spin_unlock(&ifp->lock);
2846 read_unlock(&addrconf_hash_lock);
2847 spin_lock(&ifpub->lock);
2848 ifpub->regen_count = 0;
2849 spin_unlock(&ifpub->lock);
2850 ipv6_create_tempaddr(ifpub, ifp);
2851 in6_ifa_put(ifpub);
2852 in6_ifa_put(ifp);
2853 goto restart;
2854 }
2855 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
2856 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
2857 spin_unlock(&ifp->lock);
2858 #endif
2859 } else {
2860 /* ifp->prefered_lft <= ifp->valid_lft */
2861 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2862 next = ifp->tstamp + ifp->prefered_lft * HZ;
2863 spin_unlock(&ifp->lock);
2864 }
2865 }
2866 read_unlock(&addrconf_hash_lock);
2867 }
2868
2869 addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
2870 add_timer(&addr_chk_timer);
2871 spin_unlock_bh(&addrconf_verify_lock);
2872 }
2873
2874 static int
2875 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
2876 {
2877 struct rtattr **rta = arg;
2878 struct ifaddrmsg *ifm = NLMSG_DATA(nlh);
2879 struct in6_addr *pfx;
2880
2881 pfx = NULL;
2882 if (rta[IFA_ADDRESS-1]) {
2883 if (RTA_PAYLOAD(rta[IFA_ADDRESS-1]) < sizeof(*pfx))
2884 return -EINVAL;
2885 pfx = RTA_DATA(rta[IFA_ADDRESS-1]);
2886 }
2887 if (rta[IFA_LOCAL-1]) {
2888 if (RTA_PAYLOAD(rta[IFA_LOCAL-1]) < sizeof(*pfx) ||
2889 (pfx && memcmp(pfx, RTA_DATA(rta[IFA_LOCAL-1]), sizeof(*pfx))))
2890 return -EINVAL;
2891 pfx = RTA_DATA(rta[IFA_LOCAL-1]);
2892 }
2893 if (pfx == NULL)
2894 return -EINVAL;
2895
2896 return inet6_addr_del(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
2897 }
2898
2899 static int
2900 inet6_addr_modify(int ifindex, struct in6_addr *pfx,
2901 __u32 prefered_lft, __u32 valid_lft)
2902 {
2903 struct inet6_ifaddr *ifp = NULL;
2904 struct net_device *dev;
2905 int ifa_flags = 0;
2906
2907 if ((dev = __dev_get_by_index(ifindex)) == NULL)
2908 return -ENODEV;
2909
2910 if (!(dev->flags&IFF_UP))
2911 return -ENETDOWN;
2912
2913 if (!valid_lft || (prefered_lft > valid_lft))
2914 return -EINVAL;
2915
2916 ifp = ipv6_get_ifaddr(pfx, dev, 1);
2917 if (ifp == NULL)
2918 return -ENOENT;
2919
2920 if (valid_lft == INFINITY_LIFE_TIME)
2921 ifa_flags = IFA_F_PERMANENT;
2922 else if (valid_lft >= 0x7FFFFFFF/HZ)
2923 valid_lft = 0x7FFFFFFF/HZ;
2924
2925 if (prefered_lft == 0)
2926 ifa_flags = IFA_F_DEPRECATED;
2927 else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
2928 (prefered_lft != INFINITY_LIFE_TIME))
2929 prefered_lft = 0x7FFFFFFF/HZ;
2930
2931 spin_lock_bh(&ifp->lock);
2932 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED|IFA_F_PERMANENT)) | ifa_flags;
2933
2934 ifp->tstamp = jiffies;
2935 ifp->valid_lft = valid_lft;
2936 ifp->prefered_lft = prefered_lft;
2937
2938 spin_unlock_bh(&ifp->lock);
2939 if (!(ifp->flags&IFA_F_TENTATIVE))
2940 ipv6_ifa_notify(0, ifp);
2941 in6_ifa_put(ifp);
2942
2943 addrconf_verify(0);
2944
2945 return 0;
2946 }
2947
2948 static int
2949 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
2950 {
2951 struct rtattr **rta = arg;
2952 struct ifaddrmsg *ifm = NLMSG_DATA(nlh);
2953 struct in6_addr *pfx;
2954 __u32 valid_lft = INFINITY_LIFE_TIME, prefered_lft = INFINITY_LIFE_TIME;
2955
2956 pfx = NULL;
2957 if (rta[IFA_ADDRESS-1]) {
2958 if (RTA_PAYLOAD(rta[IFA_ADDRESS-1]) < sizeof(*pfx))
2959 return -EINVAL;
2960 pfx = RTA_DATA(rta[IFA_ADDRESS-1]);
2961 }
2962 if (rta[IFA_LOCAL-1]) {
2963 if (RTA_PAYLOAD(rta[IFA_LOCAL-1]) < sizeof(*pfx) ||
2964 (pfx && memcmp(pfx, RTA_DATA(rta[IFA_LOCAL-1]), sizeof(*pfx))))
2965 return -EINVAL;
2966 pfx = RTA_DATA(rta[IFA_LOCAL-1]);
2967 }
2968 if (pfx == NULL)
2969 return -EINVAL;
2970
2971 if (rta[IFA_CACHEINFO-1]) {
2972 struct ifa_cacheinfo *ci;
2973 if (RTA_PAYLOAD(rta[IFA_CACHEINFO-1]) < sizeof(*ci))
2974 return -EINVAL;
2975 ci = RTA_DATA(rta[IFA_CACHEINFO-1]);
2976 valid_lft = ci->ifa_valid;
2977 prefered_lft = ci->ifa_prefered;
2978 }
2979
2980 if (nlh->nlmsg_flags & NLM_F_REPLACE) {
2981 int ret;
2982 ret = inet6_addr_modify(ifm->ifa_index, pfx,
2983 prefered_lft, valid_lft);
2984 if (ret == 0 || !(nlh->nlmsg_flags & NLM_F_CREATE))
2985 return ret;
2986 }
2987
2988 return inet6_addr_add(ifm->ifa_index, pfx, ifm->ifa_prefixlen,
2989 prefered_lft, valid_lft);
2990
2991 }
2992
2993 /* Maximum length of ifa_cacheinfo attributes */
2994 #define INET6_IFADDR_RTA_SPACE \
2995 RTA_SPACE(16) /* IFA_ADDRESS */ + \
2996 RTA_SPACE(sizeof(struct ifa_cacheinfo)) /* CACHEINFO */
2997
2998 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
2999 u32 pid, u32 seq, int event, unsigned int flags)
3000 {
3001 struct ifaddrmsg *ifm;
3002 struct nlmsghdr *nlh;
3003 struct ifa_cacheinfo ci;
3004 unsigned char *b = skb->tail;
3005
3006 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags);
3007 ifm = NLMSG_DATA(nlh);
3008 ifm->ifa_family = AF_INET6;
3009 ifm->ifa_prefixlen = ifa->prefix_len;
3010 ifm->ifa_flags = ifa->flags;
3011 ifm->ifa_scope = RT_SCOPE_UNIVERSE;
3012 if (ifa->scope&IFA_HOST)
3013 ifm->ifa_scope = RT_SCOPE_HOST;
3014 else if (ifa->scope&IFA_LINK)
3015 ifm->ifa_scope = RT_SCOPE_LINK;
3016 else if (ifa->scope&IFA_SITE)
3017 ifm->ifa_scope = RT_SCOPE_SITE;
3018 ifm->ifa_index = ifa->idev->dev->ifindex;
3019 RTA_PUT(skb, IFA_ADDRESS, 16, &ifa->addr);
3020 if (!(ifa->flags&IFA_F_PERMANENT)) {
3021 ci.ifa_prefered = ifa->prefered_lft;
3022 ci.ifa_valid = ifa->valid_lft;
3023 if (ci.ifa_prefered != INFINITY_LIFE_TIME) {
3024 long tval = (jiffies - ifa->tstamp)/HZ;
3025 ci.ifa_prefered -= tval;
3026 if (ci.ifa_valid != INFINITY_LIFE_TIME)
3027 ci.ifa_valid -= tval;
3028 }
3029 } else {
3030 ci.ifa_prefered = INFINITY_LIFE_TIME;
3031 ci.ifa_valid = INFINITY_LIFE_TIME;
3032 }
3033 ci.cstamp = (__u32)(TIME_DELTA(ifa->cstamp, INITIAL_JIFFIES) / HZ * 100
3034 + TIME_DELTA(ifa->cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3035 ci.tstamp = (__u32)(TIME_DELTA(ifa->tstamp, INITIAL_JIFFIES) / HZ * 100
3036 + TIME_DELTA(ifa->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3037 RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3038 nlh->nlmsg_len = skb->tail - b;
3039 return skb->len;
3040
3041 nlmsg_failure:
3042 rtattr_failure:
3043 skb_trim(skb, b - skb->data);
3044 return -1;
3045 }
3046
3047 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3048 u32 pid, u32 seq, int event, u16 flags)
3049 {
3050 struct ifaddrmsg *ifm;
3051 struct nlmsghdr *nlh;
3052 struct ifa_cacheinfo ci;
3053 unsigned char *b = skb->tail;
3054
3055 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags);
3056 ifm = NLMSG_DATA(nlh);
3057 ifm->ifa_family = AF_INET6;
3058 ifm->ifa_prefixlen = 128;
3059 ifm->ifa_flags = IFA_F_PERMANENT;
3060 ifm->ifa_scope = RT_SCOPE_UNIVERSE;
3061 if (ipv6_addr_scope(&ifmca->mca_addr)&IFA_SITE)
3062 ifm->ifa_scope = RT_SCOPE_SITE;
3063 ifm->ifa_index = ifmca->idev->dev->ifindex;
3064 RTA_PUT(skb, IFA_MULTICAST, 16, &ifmca->mca_addr);
3065 ci.cstamp = (__u32)(TIME_DELTA(ifmca->mca_cstamp, INITIAL_JIFFIES) / HZ
3066 * 100 + TIME_DELTA(ifmca->mca_cstamp, INITIAL_JIFFIES) % HZ
3067 * 100 / HZ);
3068 ci.tstamp = (__u32)(TIME_DELTA(ifmca->mca_tstamp, INITIAL_JIFFIES) / HZ
3069 * 100 + TIME_DELTA(ifmca->mca_tstamp, INITIAL_JIFFIES) % HZ
3070 * 100 / HZ);
3071 ci.ifa_prefered = INFINITY_LIFE_TIME;
3072 ci.ifa_valid = INFINITY_LIFE_TIME;
3073 RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3074 nlh->nlmsg_len = skb->tail - b;
3075 return skb->len;
3076
3077 nlmsg_failure:
3078 rtattr_failure:
3079 skb_trim(skb, b - skb->data);
3080 return -1;
3081 }
3082
3083 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3084 u32 pid, u32 seq, int event, unsigned int flags)
3085 {
3086 struct ifaddrmsg *ifm;
3087 struct nlmsghdr *nlh;
3088 struct ifa_cacheinfo ci;
3089 unsigned char *b = skb->tail;
3090
3091 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags);
3092 ifm = NLMSG_DATA(nlh);
3093 ifm->ifa_family = AF_INET6;
3094 ifm->ifa_prefixlen = 128;
3095 ifm->ifa_flags = IFA_F_PERMANENT;
3096 ifm->ifa_scope = RT_SCOPE_UNIVERSE;
3097 if (ipv6_addr_scope(&ifaca->aca_addr)&IFA_SITE)
3098 ifm->ifa_scope = RT_SCOPE_SITE;
3099 ifm->ifa_index = ifaca->aca_idev->dev->ifindex;
3100 RTA_PUT(skb, IFA_ANYCAST, 16, &ifaca->aca_addr);
3101 ci.cstamp = (__u32)(TIME_DELTA(ifaca->aca_cstamp, INITIAL_JIFFIES) / HZ
3102 * 100 + TIME_DELTA(ifaca->aca_cstamp, INITIAL_JIFFIES) % HZ
3103 * 100 / HZ);
3104 ci.tstamp = (__u32)(TIME_DELTA(ifaca->aca_tstamp, INITIAL_JIFFIES) / HZ
3105 * 100 + TIME_DELTA(ifaca->aca_tstamp, INITIAL_JIFFIES) % HZ
3106 * 100 / HZ);
3107 ci.ifa_prefered = INFINITY_LIFE_TIME;
3108 ci.ifa_valid = INFINITY_LIFE_TIME;
3109 RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3110 nlh->nlmsg_len = skb->tail - b;
3111 return skb->len;
3112
3113 nlmsg_failure:
3114 rtattr_failure:
3115 skb_trim(skb, b - skb->data);
3116 return -1;
3117 }
3118
3119 enum addr_type_t
3120 {
3121 UNICAST_ADDR,
3122 MULTICAST_ADDR,
3123 ANYCAST_ADDR,
3124 };
3125
3126 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3127 enum addr_type_t type)
3128 {
3129 int idx, ip_idx;
3130 int s_idx, s_ip_idx;
3131 int err = 1;
3132 struct net_device *dev;
3133 struct inet6_dev *idev = NULL;
3134 struct inet6_ifaddr *ifa;
3135 struct ifmcaddr6 *ifmca;
3136 struct ifacaddr6 *ifaca;
3137
3138 s_idx = cb->args[0];
3139 s_ip_idx = ip_idx = cb->args[1];
3140 read_lock(&dev_base_lock);
3141
3142 for (dev = dev_base, idx = 0; dev; dev = dev->next, idx++) {
3143 if (idx < s_idx)
3144 continue;
3145 if (idx > s_idx)
3146 s_ip_idx = 0;
3147 ip_idx = 0;
3148 if ((idev = in6_dev_get(dev)) == NULL)
3149 continue;
3150 read_lock_bh(&idev->lock);
3151 switch (type) {
3152 case UNICAST_ADDR:
3153 /* unicast address incl. temp addr */
3154 for (ifa = idev->addr_list; ifa;
3155 ifa = ifa->if_next, ip_idx++) {
3156 if (ip_idx < s_ip_idx)
3157 continue;
3158 if ((err = inet6_fill_ifaddr(skb, ifa,
3159 NETLINK_CB(cb->skb).pid,
3160 cb->nlh->nlmsg_seq, RTM_NEWADDR,
3161 NLM_F_MULTI)) <= 0)
3162 goto done;
3163 }
3164 break;
3165 case MULTICAST_ADDR:
3166 /* multicast address */
3167 for (ifmca = idev->mc_list; ifmca;
3168 ifmca = ifmca->next, ip_idx++) {
3169 if (ip_idx < s_ip_idx)
3170 continue;
3171 if ((err = inet6_fill_ifmcaddr(skb, ifmca,
3172 NETLINK_CB(cb->skb).pid,
3173 cb->nlh->nlmsg_seq, RTM_GETMULTICAST,
3174 NLM_F_MULTI)) <= 0)
3175 goto done;
3176 }
3177 break;
3178 case ANYCAST_ADDR:
3179 /* anycast address */
3180 for (ifaca = idev->ac_list; ifaca;
3181 ifaca = ifaca->aca_next, ip_idx++) {
3182 if (ip_idx < s_ip_idx)
3183 continue;
3184 if ((err = inet6_fill_ifacaddr(skb, ifaca,
3185 NETLINK_CB(cb->skb).pid,
3186 cb->nlh->nlmsg_seq, RTM_GETANYCAST,
3187 NLM_F_MULTI)) <= 0)
3188 goto done;
3189 }
3190 break;
3191 default:
3192 break;
3193 }
3194 read_unlock_bh(&idev->lock);
3195 in6_dev_put(idev);
3196 }
3197 done:
3198 if (err <= 0) {
3199 read_unlock_bh(&idev->lock);
3200 in6_dev_put(idev);
3201 }
3202 read_unlock(&dev_base_lock);
3203 cb->args[0] = idx;
3204 cb->args[1] = ip_idx;
3205 return skb->len;
3206 }
3207
3208 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3209 {
3210 enum addr_type_t type = UNICAST_ADDR;
3211 return inet6_dump_addr(skb, cb, type);
3212 }
3213
3214 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3215 {
3216 enum addr_type_t type = MULTICAST_ADDR;
3217 return inet6_dump_addr(skb, cb, type);
3218 }
3219
3220
3221 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3222 {
3223 enum addr_type_t type = ANYCAST_ADDR;
3224 return inet6_dump_addr(skb, cb, type);
3225 }
3226
3227 static int inet6_rtm_getaddr(struct sk_buff *in_skb,
3228 struct nlmsghdr* nlh, void *arg)
3229 {
3230 struct rtattr **rta = arg;
3231 struct ifaddrmsg *ifm = NLMSG_DATA(nlh);
3232 struct in6_addr *addr = NULL;
3233 struct net_device *dev = NULL;
3234 struct inet6_ifaddr *ifa;
3235 struct sk_buff *skb;
3236 int size = NLMSG_SPACE(sizeof(struct ifaddrmsg) + INET6_IFADDR_RTA_SPACE);
3237 int err;
3238
3239 if (rta[IFA_ADDRESS-1]) {
3240 if (RTA_PAYLOAD(rta[IFA_ADDRESS-1]) < sizeof(*addr))
3241 return -EINVAL;
3242 addr = RTA_DATA(rta[IFA_ADDRESS-1]);
3243 }
3244 if (rta[IFA_LOCAL-1]) {
3245 if (RTA_PAYLOAD(rta[IFA_LOCAL-1]) < sizeof(*addr) ||
3246 (addr && memcmp(addr, RTA_DATA(rta[IFA_LOCAL-1]), sizeof(*addr))))
3247 return -EINVAL;
3248 addr = RTA_DATA(rta[IFA_LOCAL-1]);
3249 }
3250 if (addr == NULL)
3251 return -EINVAL;
3252
3253 if (ifm->ifa_index)
3254 dev = __dev_get_by_index(ifm->ifa_index);
3255
3256 if ((ifa = ipv6_get_ifaddr(addr, dev, 1)) == NULL)
3257 return -EADDRNOTAVAIL;
3258
3259 if ((skb = alloc_skb(size, GFP_KERNEL)) == NULL) {
3260 err = -ENOBUFS;
3261 goto out;
3262 }
3263
3264 NETLINK_CB(skb).dst_pid = NETLINK_CB(in_skb).pid;
3265 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3266 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3267 if (err < 0) {
3268 err = -EMSGSIZE;
3269 goto out_free;
3270 }
3271
3272 err = rtnl_unicast(skb, NETLINK_CB(in_skb).pid);
3273 out:
3274 in6_ifa_put(ifa);
3275 return err;
3276 out_free:
3277 kfree_skb(skb);
3278 goto out;
3279 }
3280
3281 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3282 {
3283 struct sk_buff *skb;
3284 int payload = sizeof(struct ifaddrmsg) + INET6_IFADDR_RTA_SPACE;
3285 int err = -ENOBUFS;
3286
3287 skb = nlmsg_new(nlmsg_total_size(payload), GFP_ATOMIC);
3288 if (skb == NULL)
3289 goto errout;
3290
3291 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3292 if (err < 0) {
3293 kfree_skb(skb);
3294 goto errout;
3295 }
3296
3297 err = rtnl_notify(skb, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3298 errout:
3299 if (err < 0)
3300 rtnl_set_sk_err(RTNLGRP_IPV6_IFADDR, err);
3301 }
3302
3303 static void inline ipv6_store_devconf(struct ipv6_devconf *cnf,
3304 __s32 *array, int bytes)
3305 {
3306 memset(array, 0, bytes);
3307 array[DEVCONF_FORWARDING] = cnf->forwarding;
3308 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3309 array[DEVCONF_MTU6] = cnf->mtu6;
3310 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3311 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3312 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3313 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3314 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3315 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3316 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3317 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3318 #ifdef CONFIG_IPV6_PRIVACY
3319 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3320 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3321 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3322 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3323 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3324 #endif
3325 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3326 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3327 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3328 #ifdef CONFIG_IPV6_ROUTER_PREF
3329 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3330 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
3331 #ifdef CONFIV_IPV6_ROUTE_INFO
3332 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3333 #endif
3334 #endif
3335 }
3336
3337 /* Maximum length of ifinfomsg attributes */
3338 #define INET6_IFINFO_RTA_SPACE \
3339 RTA_SPACE(IFNAMSIZ) /* IFNAME */ + \
3340 RTA_SPACE(MAX_ADDR_LEN) /* ADDRESS */ + \
3341 RTA_SPACE(sizeof(u32)) /* MTU */ + \
3342 RTA_SPACE(sizeof(int)) /* LINK */ + \
3343 RTA_SPACE(0) /* PROTINFO */ + \
3344 RTA_SPACE(sizeof(u32)) /* FLAGS */ + \
3345 RTA_SPACE(sizeof(struct ifla_cacheinfo)) /* CACHEINFO */ + \
3346 RTA_SPACE(sizeof(__s32[DEVCONF_MAX])) /* CONF */
3347
3348 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3349 u32 pid, u32 seq, int event, unsigned int flags)
3350 {
3351 struct net_device *dev = idev->dev;
3352 __s32 *array = NULL;
3353 struct ifinfomsg *r;
3354 struct nlmsghdr *nlh;
3355 unsigned char *b = skb->tail;
3356 struct rtattr *subattr;
3357 __u32 mtu = dev->mtu;
3358 struct ifla_cacheinfo ci;
3359
3360 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*r), flags);
3361 r = NLMSG_DATA(nlh);
3362 r->ifi_family = AF_INET6;
3363 r->__ifi_pad = 0;
3364 r->ifi_type = dev->type;
3365 r->ifi_index = dev->ifindex;
3366 r->ifi_flags = dev_get_flags(dev);
3367 r->ifi_change = 0;
3368
3369 RTA_PUT(skb, IFLA_IFNAME, strlen(dev->name)+1, dev->name);
3370
3371 if (dev->addr_len)
3372 RTA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3373
3374 RTA_PUT(skb, IFLA_MTU, sizeof(mtu), &mtu);
3375 if (dev->ifindex != dev->iflink)
3376 RTA_PUT(skb, IFLA_LINK, sizeof(int), &dev->iflink);
3377
3378 subattr = (struct rtattr*)skb->tail;
3379
3380 RTA_PUT(skb, IFLA_PROTINFO, 0, NULL);
3381
3382 /* return the device flags */
3383 RTA_PUT(skb, IFLA_INET6_FLAGS, sizeof(__u32), &idev->if_flags);
3384
3385 /* return interface cacheinfo */
3386 ci.max_reasm_len = IPV6_MAXPLEN;
3387 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3388 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3389 ci.reachable_time = idev->nd_parms->reachable_time;
3390 ci.retrans_time = idev->nd_parms->retrans_time;
3391 RTA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3392
3393 /* return the device sysctl params */
3394 if ((array = kmalloc(DEVCONF_MAX * sizeof(*array), GFP_ATOMIC)) == NULL)
3395 goto rtattr_failure;
3396 ipv6_store_devconf(&idev->cnf, array, DEVCONF_MAX * sizeof(*array));
3397 RTA_PUT(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(*array), array);
3398
3399 /* XXX - Statistics/MC not implemented */
3400 subattr->rta_len = skb->tail - (u8*)subattr;
3401
3402 nlh->nlmsg_len = skb->tail - b;
3403 kfree(array);
3404 return skb->len;
3405
3406 nlmsg_failure:
3407 rtattr_failure:
3408 kfree(array);
3409 skb_trim(skb, b - skb->data);
3410 return -1;
3411 }
3412
3413 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3414 {
3415 int idx, err;
3416 int s_idx = cb->args[0];
3417 struct net_device *dev;
3418 struct inet6_dev *idev;
3419
3420 read_lock(&dev_base_lock);
3421 for (dev=dev_base, idx=0; dev; dev = dev->next, idx++) {
3422 if (idx < s_idx)
3423 continue;
3424 if ((idev = in6_dev_get(dev)) == NULL)
3425 continue;
3426 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
3427 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
3428 in6_dev_put(idev);
3429 if (err <= 0)
3430 break;
3431 }
3432 read_unlock(&dev_base_lock);
3433 cb->args[0] = idx;
3434
3435 return skb->len;
3436 }
3437
3438 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3439 {
3440 struct sk_buff *skb;
3441 int payload = sizeof(struct ifinfomsg) + INET6_IFINFO_RTA_SPACE;
3442 int err = -ENOBUFS;
3443
3444 skb = nlmsg_new(nlmsg_total_size(payload), GFP_ATOMIC);
3445 if (skb == NULL)
3446 goto errout;
3447
3448 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
3449 if (err < 0) {
3450 kfree_skb(skb);
3451 goto errout;
3452 }
3453
3454 err = rtnl_notify(skb, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3455 errout:
3456 if (err < 0)
3457 rtnl_set_sk_err(RTNLGRP_IPV6_IFADDR, err);
3458 }
3459
3460 /* Maximum length of prefix_cacheinfo attributes */
3461 #define INET6_PREFIX_RTA_SPACE \
3462 RTA_SPACE(sizeof(((struct prefix_info *)NULL)->prefix)) /* ADDRESS */ + \
3463 RTA_SPACE(sizeof(struct prefix_cacheinfo)) /* CACHEINFO */
3464
3465 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
3466 struct prefix_info *pinfo, u32 pid, u32 seq,
3467 int event, unsigned int flags)
3468 {
3469 struct prefixmsg *pmsg;
3470 struct nlmsghdr *nlh;
3471 unsigned char *b = skb->tail;
3472 struct prefix_cacheinfo ci;
3473
3474 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*pmsg), flags);
3475 pmsg = NLMSG_DATA(nlh);
3476 pmsg->prefix_family = AF_INET6;
3477 pmsg->prefix_pad1 = 0;
3478 pmsg->prefix_pad2 = 0;
3479 pmsg->prefix_ifindex = idev->dev->ifindex;
3480 pmsg->prefix_len = pinfo->prefix_len;
3481 pmsg->prefix_type = pinfo->type;
3482 pmsg->prefix_pad3 = 0;
3483
3484 pmsg->prefix_flags = 0;
3485 if (pinfo->onlink)
3486 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3487 if (pinfo->autoconf)
3488 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3489
3490 RTA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
3491
3492 ci.preferred_time = ntohl(pinfo->prefered);
3493 ci.valid_time = ntohl(pinfo->valid);
3494 RTA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
3495
3496 nlh->nlmsg_len = skb->tail - b;
3497 return skb->len;
3498
3499 nlmsg_failure:
3500 rtattr_failure:
3501 skb_trim(skb, b - skb->data);
3502 return -1;
3503 }
3504
3505 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
3506 struct prefix_info *pinfo)
3507 {
3508 struct sk_buff *skb;
3509 int payload = sizeof(struct prefixmsg) + INET6_PREFIX_RTA_SPACE;
3510 int err = -ENOBUFS;
3511
3512 skb = nlmsg_new(nlmsg_total_size(payload), GFP_ATOMIC);
3513 if (skb == NULL)
3514 goto errout;
3515
3516 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
3517 if (err < 0) {
3518 kfree_skb(skb);
3519 goto errout;
3520 }
3521
3522 err = rtnl_notify(skb, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
3523 errout:
3524 if (err < 0)
3525 rtnl_set_sk_err(RTNLGRP_IPV6_PREFIX, err);
3526 }
3527
3528 static struct rtnetlink_link inet6_rtnetlink_table[RTM_NR_MSGTYPES] = {
3529 [RTM_GETLINK - RTM_BASE] = { .dumpit = inet6_dump_ifinfo, },
3530 [RTM_NEWADDR - RTM_BASE] = { .doit = inet6_rtm_newaddr, },
3531 [RTM_DELADDR - RTM_BASE] = { .doit = inet6_rtm_deladdr, },
3532 [RTM_GETADDR - RTM_BASE] = { .doit = inet6_rtm_getaddr,
3533 .dumpit = inet6_dump_ifaddr, },
3534 [RTM_GETMULTICAST - RTM_BASE] = { .dumpit = inet6_dump_ifmcaddr, },
3535 [RTM_GETANYCAST - RTM_BASE] = { .dumpit = inet6_dump_ifacaddr, },
3536 [RTM_NEWROUTE - RTM_BASE] = { .doit = inet6_rtm_newroute, },
3537 [RTM_DELROUTE - RTM_BASE] = { .doit = inet6_rtm_delroute, },
3538 [RTM_GETROUTE - RTM_BASE] = { .doit = inet6_rtm_getroute,
3539 .dumpit = inet6_dump_fib, },
3540 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3541 [RTM_GETRULE - RTM_BASE] = { .dumpit = fib6_rules_dump, },
3542 #endif
3543 };
3544
3545 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3546 {
3547 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3548
3549 switch (event) {
3550 case RTM_NEWADDR:
3551 ip6_ins_rt(ifp->rt, NULL, NULL, NULL);
3552 if (ifp->idev->cnf.forwarding)
3553 addrconf_join_anycast(ifp);
3554 break;
3555 case RTM_DELADDR:
3556 if (ifp->idev->cnf.forwarding)
3557 addrconf_leave_anycast(ifp);
3558 addrconf_leave_solict(ifp->idev, &ifp->addr);
3559 dst_hold(&ifp->rt->u.dst);
3560 if (ip6_del_rt(ifp->rt, NULL, NULL, NULL))
3561 dst_free(&ifp->rt->u.dst);
3562 break;
3563 }
3564 }
3565
3566 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3567 {
3568 read_lock_bh(&addrconf_lock);
3569 if (likely(ifp->idev->dead == 0))
3570 __ipv6_ifa_notify(event, ifp);
3571 read_unlock_bh(&addrconf_lock);
3572 }
3573
3574 #ifdef CONFIG_SYSCTL
3575
3576 static
3577 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3578 void __user *buffer, size_t *lenp, loff_t *ppos)
3579 {
3580 int *valp = ctl->data;
3581 int val = *valp;
3582 int ret;
3583
3584 ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3585
3586 if (write && valp != &ipv6_devconf_dflt.forwarding) {
3587 if (valp != &ipv6_devconf.forwarding) {
3588 if ((!*valp) ^ (!val)) {
3589 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
3590 if (idev == NULL)
3591 return ret;
3592 dev_forward_change(idev);
3593 }
3594 } else {
3595 ipv6_devconf_dflt.forwarding = ipv6_devconf.forwarding;
3596 addrconf_forward_change();
3597 }
3598 if (*valp)
3599 rt6_purge_dflt_routers();
3600 }
3601
3602 return ret;
3603 }
3604
3605 static int addrconf_sysctl_forward_strategy(ctl_table *table,
3606 int __user *name, int nlen,
3607 void __user *oldval,
3608 size_t __user *oldlenp,
3609 void __user *newval, size_t newlen,
3610 void **context)
3611 {
3612 int *valp = table->data;
3613 int new;
3614
3615 if (!newval || !newlen)
3616 return 0;
3617 if (newlen != sizeof(int))
3618 return -EINVAL;
3619 if (get_user(new, (int __user *)newval))
3620 return -EFAULT;
3621 if (new == *valp)
3622 return 0;
3623 if (oldval && oldlenp) {
3624 size_t len;
3625 if (get_user(len, oldlenp))
3626 return -EFAULT;
3627 if (len) {
3628 if (len > table->maxlen)
3629 len = table->maxlen;
3630 if (copy_to_user(oldval, valp, len))
3631 return -EFAULT;
3632 if (put_user(len, oldlenp))
3633 return -EFAULT;
3634 }
3635 }
3636
3637 if (valp != &ipv6_devconf_dflt.forwarding) {
3638 if (valp != &ipv6_devconf.forwarding) {
3639 struct inet6_dev *idev = (struct inet6_dev *)table->extra1;
3640 int changed;
3641 if (unlikely(idev == NULL))
3642 return -ENODEV;
3643 changed = (!*valp) ^ (!new);
3644 *valp = new;
3645 if (changed)
3646 dev_forward_change(idev);
3647 } else {
3648 *valp = new;
3649 addrconf_forward_change();
3650 }
3651
3652 if (*valp)
3653 rt6_purge_dflt_routers();
3654 } else
3655 *valp = new;
3656
3657 return 1;
3658 }
3659
3660 static struct addrconf_sysctl_table
3661 {
3662 struct ctl_table_header *sysctl_header;
3663 ctl_table addrconf_vars[__NET_IPV6_MAX];
3664 ctl_table addrconf_dev[2];
3665 ctl_table addrconf_conf_dir[2];
3666 ctl_table addrconf_proto_dir[2];
3667 ctl_table addrconf_root_dir[2];
3668 } addrconf_sysctl __read_mostly = {
3669 .sysctl_header = NULL,
3670 .addrconf_vars = {
3671 {
3672 .ctl_name = NET_IPV6_FORWARDING,
3673 .procname = "forwarding",
3674 .data = &ipv6_devconf.forwarding,
3675 .maxlen = sizeof(int),
3676 .mode = 0644,
3677 .proc_handler = &addrconf_sysctl_forward,
3678 .strategy = &addrconf_sysctl_forward_strategy,
3679 },
3680 {
3681 .ctl_name = NET_IPV6_HOP_LIMIT,
3682 .procname = "hop_limit",
3683 .data = &ipv6_devconf.hop_limit,
3684 .maxlen = sizeof(int),
3685 .mode = 0644,
3686 .proc_handler = proc_dointvec,
3687 },
3688 {
3689 .ctl_name = NET_IPV6_MTU,
3690 .procname = "mtu",
3691 .data = &ipv6_devconf.mtu6,
3692 .maxlen = sizeof(int),
3693 .mode = 0644,
3694 .proc_handler = &proc_dointvec,
3695 },
3696 {
3697 .ctl_name = NET_IPV6_ACCEPT_RA,
3698 .procname = "accept_ra",
3699 .data = &ipv6_devconf.accept_ra,
3700 .maxlen = sizeof(int),
3701 .mode = 0644,
3702 .proc_handler = &proc_dointvec,
3703 },
3704 {
3705 .ctl_name = NET_IPV6_ACCEPT_REDIRECTS,
3706 .procname = "accept_redirects",
3707 .data = &ipv6_devconf.accept_redirects,
3708 .maxlen = sizeof(int),
3709 .mode = 0644,
3710 .proc_handler = &proc_dointvec,
3711 },
3712 {
3713 .ctl_name = NET_IPV6_AUTOCONF,
3714 .procname = "autoconf",
3715 .data = &ipv6_devconf.autoconf,
3716 .maxlen = sizeof(int),
3717 .mode = 0644,
3718 .proc_handler = &proc_dointvec,
3719 },
3720 {
3721 .ctl_name = NET_IPV6_DAD_TRANSMITS,
3722 .procname = "dad_transmits",
3723 .data = &ipv6_devconf.dad_transmits,
3724 .maxlen = sizeof(int),
3725 .mode = 0644,
3726 .proc_handler = &proc_dointvec,
3727 },
3728 {
3729 .ctl_name = NET_IPV6_RTR_SOLICITS,
3730 .procname = "router_solicitations",
3731 .data = &ipv6_devconf.rtr_solicits,
3732 .maxlen = sizeof(int),
3733 .mode = 0644,
3734 .proc_handler = &proc_dointvec,
3735 },
3736 {
3737 .ctl_name = NET_IPV6_RTR_SOLICIT_INTERVAL,
3738 .procname = "router_solicitation_interval",
3739 .data = &ipv6_devconf.rtr_solicit_interval,
3740 .maxlen = sizeof(int),
3741 .mode = 0644,
3742 .proc_handler = &proc_dointvec_jiffies,
3743 .strategy = &sysctl_jiffies,
3744 },
3745 {
3746 .ctl_name = NET_IPV6_RTR_SOLICIT_DELAY,
3747 .procname = "router_solicitation_delay",
3748 .data = &ipv6_devconf.rtr_solicit_delay,
3749 .maxlen = sizeof(int),
3750 .mode = 0644,
3751 .proc_handler = &proc_dointvec_jiffies,
3752 .strategy = &sysctl_jiffies,
3753 },
3754 {
3755 .ctl_name = NET_IPV6_FORCE_MLD_VERSION,
3756 .procname = "force_mld_version",
3757 .data = &ipv6_devconf.force_mld_version,
3758 .maxlen = sizeof(int),
3759 .mode = 0644,
3760 .proc_handler = &proc_dointvec,
3761 },
3762 #ifdef CONFIG_IPV6_PRIVACY
3763 {
3764 .ctl_name = NET_IPV6_USE_TEMPADDR,
3765 .procname = "use_tempaddr",
3766 .data = &ipv6_devconf.use_tempaddr,
3767 .maxlen = sizeof(int),
3768 .mode = 0644,
3769 .proc_handler = &proc_dointvec,
3770 },
3771 {
3772 .ctl_name = NET_IPV6_TEMP_VALID_LFT,
3773 .procname = "temp_valid_lft",
3774 .data = &ipv6_devconf.temp_valid_lft,
3775 .maxlen = sizeof(int),
3776 .mode = 0644,
3777 .proc_handler = &proc_dointvec,
3778 },
3779 {
3780 .ctl_name = NET_IPV6_TEMP_PREFERED_LFT,
3781 .procname = "temp_prefered_lft",
3782 .data = &ipv6_devconf.temp_prefered_lft,
3783 .maxlen = sizeof(int),
3784 .mode = 0644,
3785 .proc_handler = &proc_dointvec,
3786 },
3787 {
3788 .ctl_name = NET_IPV6_REGEN_MAX_RETRY,
3789 .procname = "regen_max_retry",
3790 .data = &ipv6_devconf.regen_max_retry,
3791 .maxlen = sizeof(int),
3792 .mode = 0644,
3793 .proc_handler = &proc_dointvec,
3794 },
3795 {
3796 .ctl_name = NET_IPV6_MAX_DESYNC_FACTOR,
3797 .procname = "max_desync_factor",
3798 .data = &ipv6_devconf.max_desync_factor,
3799 .maxlen = sizeof(int),
3800 .mode = 0644,
3801 .proc_handler = &proc_dointvec,
3802 },
3803 #endif
3804 {
3805 .ctl_name = NET_IPV6_MAX_ADDRESSES,
3806 .procname = "max_addresses",
3807 .data = &ipv6_devconf.max_addresses,
3808 .maxlen = sizeof(int),
3809 .mode = 0644,
3810 .proc_handler = &proc_dointvec,
3811 },
3812 {
3813 .ctl_name = NET_IPV6_ACCEPT_RA_DEFRTR,
3814 .procname = "accept_ra_defrtr",
3815 .data = &ipv6_devconf.accept_ra_defrtr,
3816 .maxlen = sizeof(int),
3817 .mode = 0644,
3818 .proc_handler = &proc_dointvec,
3819 },
3820 {
3821 .ctl_name = NET_IPV6_ACCEPT_RA_PINFO,
3822 .procname = "accept_ra_pinfo",
3823 .data = &ipv6_devconf.accept_ra_pinfo,
3824 .maxlen = sizeof(int),
3825 .mode = 0644,
3826 .proc_handler = &proc_dointvec,
3827 },
3828 #ifdef CONFIG_IPV6_ROUTER_PREF
3829 {
3830 .ctl_name = NET_IPV6_ACCEPT_RA_RTR_PREF,
3831 .procname = "accept_ra_rtr_pref",
3832 .data = &ipv6_devconf.accept_ra_rtr_pref,
3833 .maxlen = sizeof(int),
3834 .mode = 0644,
3835 .proc_handler = &proc_dointvec,
3836 },
3837 {
3838 .ctl_name = NET_IPV6_RTR_PROBE_INTERVAL,
3839 .procname = "router_probe_interval",
3840 .data = &ipv6_devconf.rtr_probe_interval,
3841 .maxlen = sizeof(int),
3842 .mode = 0644,
3843 .proc_handler = &proc_dointvec_jiffies,
3844 .strategy = &sysctl_jiffies,
3845 },
3846 #ifdef CONFIV_IPV6_ROUTE_INFO
3847 {
3848 .ctl_name = NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN,
3849 .procname = "accept_ra_rt_info_max_plen",
3850 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
3851 .maxlen = sizeof(int),
3852 .mode = 0644,
3853 .proc_handler = &proc_dointvec,
3854 },
3855 #endif
3856 #endif
3857 {
3858 .ctl_name = 0, /* sentinel */
3859 }
3860 },
3861 .addrconf_dev = {
3862 {
3863 .ctl_name = NET_PROTO_CONF_ALL,
3864 .procname = "all",
3865 .mode = 0555,
3866 .child = addrconf_sysctl.addrconf_vars,
3867 },
3868 {
3869 .ctl_name = 0, /* sentinel */
3870 }
3871 },
3872 .addrconf_conf_dir = {
3873 {
3874 .ctl_name = NET_IPV6_CONF,
3875 .procname = "conf",
3876 .mode = 0555,
3877 .child = addrconf_sysctl.addrconf_dev,
3878 },
3879 {
3880 .ctl_name = 0, /* sentinel */
3881 }
3882 },
3883 .addrconf_proto_dir = {
3884 {
3885 .ctl_name = NET_IPV6,
3886 .procname = "ipv6",
3887 .mode = 0555,
3888 .child = addrconf_sysctl.addrconf_conf_dir,
3889 },
3890 {
3891 .ctl_name = 0, /* sentinel */
3892 }
3893 },
3894 .addrconf_root_dir = {
3895 {
3896 .ctl_name = CTL_NET,
3897 .procname = "net",
3898 .mode = 0555,
3899 .child = addrconf_sysctl.addrconf_proto_dir,
3900 },
3901 {
3902 .ctl_name = 0, /* sentinel */
3903 }
3904 },
3905 };
3906
3907 static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p)
3908 {
3909 int i;
3910 struct net_device *dev = idev ? idev->dev : NULL;
3911 struct addrconf_sysctl_table *t;
3912 char *dev_name = NULL;
3913
3914 t = kmalloc(sizeof(*t), GFP_KERNEL);
3915 if (t == NULL)
3916 return;
3917 memcpy(t, &addrconf_sysctl, sizeof(*t));
3918 for (i=0; t->addrconf_vars[i].data; i++) {
3919 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
3920 t->addrconf_vars[i].de = NULL;
3921 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
3922 }
3923 if (dev) {
3924 dev_name = dev->name;
3925 t->addrconf_dev[0].ctl_name = dev->ifindex;
3926 } else {
3927 dev_name = "default";
3928 t->addrconf_dev[0].ctl_name = NET_PROTO_CONF_DEFAULT;
3929 }
3930
3931 /*
3932 * Make a copy of dev_name, because '.procname' is regarded as const
3933 * by sysctl and we wouldn't want anyone to change it under our feet
3934 * (see SIOCSIFNAME).
3935 */
3936 dev_name = kstrdup(dev_name, GFP_KERNEL);
3937 if (!dev_name)
3938 goto free;
3939
3940 t->addrconf_dev[0].procname = dev_name;
3941
3942 t->addrconf_dev[0].child = t->addrconf_vars;
3943 t->addrconf_dev[0].de = NULL;
3944 t->addrconf_conf_dir[0].child = t->addrconf_dev;
3945 t->addrconf_conf_dir[0].de = NULL;
3946 t->addrconf_proto_dir[0].child = t->addrconf_conf_dir;
3947 t->addrconf_proto_dir[0].de = NULL;
3948 t->addrconf_root_dir[0].child = t->addrconf_proto_dir;
3949 t->addrconf_root_dir[0].de = NULL;
3950
3951 t->sysctl_header = register_sysctl_table(t->addrconf_root_dir, 0);
3952 if (t->sysctl_header == NULL)
3953 goto free_procname;
3954 else
3955 p->sysctl = t;
3956 return;
3957
3958 /* error path */
3959 free_procname:
3960 kfree(dev_name);
3961 free:
3962 kfree(t);
3963
3964 return;
3965 }
3966
3967 static void addrconf_sysctl_unregister(struct ipv6_devconf *p)
3968 {
3969 if (p->sysctl) {
3970 struct addrconf_sysctl_table *t = p->sysctl;
3971 p->sysctl = NULL;
3972 unregister_sysctl_table(t->sysctl_header);
3973 kfree(t->addrconf_dev[0].procname);
3974 kfree(t);
3975 }
3976 }
3977
3978
3979 #endif
3980
3981 /*
3982 * Device notifier
3983 */
3984
3985 int register_inet6addr_notifier(struct notifier_block *nb)
3986 {
3987 return atomic_notifier_chain_register(&inet6addr_chain, nb);
3988 }
3989
3990 int unregister_inet6addr_notifier(struct notifier_block *nb)
3991 {
3992 return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
3993 }
3994
3995 /*
3996 * Init / cleanup code
3997 */
3998
3999 int __init addrconf_init(void)
4000 {
4001 int err = 0;
4002
4003 /* The addrconf netdev notifier requires that loopback_dev
4004 * has it's ipv6 private information allocated and setup
4005 * before it can bring up and give link-local addresses
4006 * to other devices which are up.
4007 *
4008 * Unfortunately, loopback_dev is not necessarily the first
4009 * entry in the global dev_base list of net devices. In fact,
4010 * it is likely to be the very last entry on that list.
4011 * So this causes the notifier registry below to try and
4012 * give link-local addresses to all devices besides loopback_dev
4013 * first, then loopback_dev, which cases all the non-loopback_dev
4014 * devices to fail to get a link-local address.
4015 *
4016 * So, as a temporary fix, allocate the ipv6 structure for
4017 * loopback_dev first by hand.
4018 * Longer term, all of the dependencies ipv6 has upon the loopback
4019 * device and it being up should be removed.
4020 */
4021 rtnl_lock();
4022 if (!ipv6_add_dev(&loopback_dev))
4023 err = -ENOMEM;
4024 rtnl_unlock();
4025 if (err)
4026 return err;
4027
4028 ip6_null_entry.rt6i_idev = in6_dev_get(&loopback_dev);
4029
4030 register_netdevice_notifier(&ipv6_dev_notf);
4031
4032 addrconf_verify(0);
4033 rtnetlink_links[PF_INET6] = inet6_rtnetlink_table;
4034 #ifdef CONFIG_SYSCTL
4035 addrconf_sysctl.sysctl_header =
4036 register_sysctl_table(addrconf_sysctl.addrconf_root_dir, 0);
4037 addrconf_sysctl_register(NULL, &ipv6_devconf_dflt);
4038 #endif
4039
4040 return 0;
4041 }
4042
4043 void __exit addrconf_cleanup(void)
4044 {
4045 struct net_device *dev;
4046 struct inet6_dev *idev;
4047 struct inet6_ifaddr *ifa;
4048 int i;
4049
4050 unregister_netdevice_notifier(&ipv6_dev_notf);
4051
4052 rtnetlink_links[PF_INET6] = NULL;
4053 #ifdef CONFIG_SYSCTL
4054 addrconf_sysctl_unregister(&ipv6_devconf_dflt);
4055 addrconf_sysctl_unregister(&ipv6_devconf);
4056 #endif
4057
4058 rtnl_lock();
4059
4060 /*
4061 * clean dev list.
4062 */
4063
4064 for (dev=dev_base; dev; dev=dev->next) {
4065 if ((idev = __in6_dev_get(dev)) == NULL)
4066 continue;
4067 addrconf_ifdown(dev, 1);
4068 }
4069 addrconf_ifdown(&loopback_dev, 2);
4070
4071 /*
4072 * Check hash table.
4073 */
4074
4075 write_lock_bh(&addrconf_hash_lock);
4076 for (i=0; i < IN6_ADDR_HSIZE; i++) {
4077 for (ifa=inet6_addr_lst[i]; ifa; ) {
4078 struct inet6_ifaddr *bifa;
4079
4080 bifa = ifa;
4081 ifa = ifa->lst_next;
4082 printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
4083 /* Do not free it; something is wrong.
4084 Now we can investigate it with debugger.
4085 */
4086 }
4087 }
4088 write_unlock_bh(&addrconf_hash_lock);
4089
4090 del_timer(&addr_chk_timer);
4091
4092 rtnl_unlock();
4093
4094 #ifdef CONFIG_PROC_FS
4095 proc_net_remove("if_inet6");
4096 #endif
4097 }
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree