]> git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blob - net/ipv6/addrconf.c
projects / mirror_ubuntu-artful-kernel.git / blob
? search:


2fea3f4402a0e5b0b3c7d2d8703aa6432f1e8dec
[mirror_ubuntu-artful-kernel.git] / net / ipv6 / addrconf.c
1 /*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
9 * $Id: addrconf.c,v 1.69 2001/10/31 21:55:54 davem Exp $
10 *
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License
13 * as published by the Free Software Foundation; either version
14 * 2 of the License, or (at your option) any later version.
15 */
16
17 /*
18 * Changes:
19 *
20 * Janos Farkas : delete timer on ifdown
21 * <chexum@bankinf.banki.hu>
22 * Andi Kleen : kill double kfree on module
23 * unload.
24 * Maciej W. Rozycki : FDDI support
25 * sekiya@USAGI : Don't send too many RS
26 * packets.
27 * yoshfuji@USAGI : Fixed interval between DAD
28 * packets.
29 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
30 * address validation timer.
31 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
32 * support.
33 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
34 * address on a same interface.
35 * YOSHIFUJI Hideaki @USAGI : ARCnet support
36 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
37 * seq_file.
38 */
39
40 #include <linux/config.h>
41 #include <linux/errno.h>
42 #include <linux/types.h>
43 #include <linux/socket.h>
44 #include <linux/sockios.h>
45 #include <linux/sched.h>
46 #include <linux/net.h>
47 #include <linux/in6.h>
48 #include <linux/netdevice.h>
49 #include <linux/if_arp.h>
50 #include <linux/if_arcnet.h>
51 #include <linux/if_infiniband.h>
52 #include <linux/route.h>
53 #include <linux/inetdevice.h>
54 #include <linux/init.h>
55 #ifdef CONFIG_SYSCTL
56 #include <linux/sysctl.h>
57 #endif
58 #include <linux/delay.h>
59 #include <linux/notifier.h>
60 #include <linux/string.h>
61
62 #include <net/sock.h>
63 #include <net/snmp.h>
64
65 #include <net/ipv6.h>
66 #include <net/protocol.h>
67 #include <net/ndisc.h>
68 #include <net/ip6_route.h>
69 #include <net/addrconf.h>
70 #include <net/tcp.h>
71 #include <net/ip.h>
72 #include <linux/if_tunnel.h>
73 #include <linux/rtnetlink.h>
74
75 #ifdef CONFIG_IPV6_PRIVACY
76 #include <linux/random.h>
77 #include <linux/crypto.h>
78 #include <asm/scatterlist.h>
79 #endif
80
81 #include <asm/uaccess.h>
82
83 #include <linux/proc_fs.h>
84 #include <linux/seq_file.h>
85
86 /* Set to 3 to get tracing... */
87 #define ACONF_DEBUG 2
88
89 #if ACONF_DEBUG >= 3
90 #define ADBG(x) printk x
91 #else
92 #define ADBG(x)
93 #endif
94
95 #define INFINITY_LIFE_TIME 0xFFFFFFFF
96 #define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b)))
97
98 #ifdef CONFIG_SYSCTL
99 static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p);
100 static void addrconf_sysctl_unregister(struct ipv6_devconf *p);
101 #endif
102
103 #ifdef CONFIG_IPV6_PRIVACY
104 static int __ipv6_regen_rndid(struct inet6_dev *idev);
105 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
106 static void ipv6_regen_rndid(unsigned long data);
107
108 static int desync_factor = MAX_DESYNC_FACTOR * HZ;
109 static struct crypto_tfm *md5_tfm;
110 static DEFINE_SPINLOCK(md5_tfm_lock);
111 #endif
112
113 static int ipv6_count_addresses(struct inet6_dev *idev);
114
115 /*
116 * Configured unicast address hash table
117 */
118 static struct inet6_ifaddr *inet6_addr_lst[IN6_ADDR_HSIZE];
119 static DEFINE_RWLOCK(addrconf_hash_lock);
120
121 /* Protects inet6 devices */
122 DEFINE_RWLOCK(addrconf_lock);
123
124 static void addrconf_verify(unsigned long);
125
126 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
127 static DEFINE_SPINLOCK(addrconf_verify_lock);
128
129 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
130 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
131
132 static int addrconf_ifdown(struct net_device *dev, int how);
133
134 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
135 static void addrconf_dad_timer(unsigned long data);
136 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
137 static void addrconf_rs_timer(unsigned long data);
138 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
139 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
140
141 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
142 struct prefix_info *pinfo);
143 static int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev);
144
145 static struct notifier_block *inet6addr_chain;
146
147 struct ipv6_devconf ipv6_devconf = {
148 .forwarding = 0,
149 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
150 .mtu6 = IPV6_MIN_MTU,
151 .accept_ra = 1,
152 .accept_redirects = 1,
153 .autoconf = 1,
154 .force_mld_version = 0,
155 .dad_transmits = 1,
156 .rtr_solicits = MAX_RTR_SOLICITATIONS,
157 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
158 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
159 #ifdef CONFIG_IPV6_PRIVACY
160 .use_tempaddr = 0,
161 .temp_valid_lft = TEMP_VALID_LIFETIME,
162 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
163 .regen_max_retry = REGEN_MAX_RETRY,
164 .max_desync_factor = MAX_DESYNC_FACTOR,
165 #endif
166 .max_addresses = IPV6_MAX_ADDRESSES,
167 };
168
169 static struct ipv6_devconf ipv6_devconf_dflt = {
170 .forwarding = 0,
171 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
172 .mtu6 = IPV6_MIN_MTU,
173 .accept_ra = 1,
174 .accept_redirects = 1,
175 .autoconf = 1,
176 .dad_transmits = 1,
177 .rtr_solicits = MAX_RTR_SOLICITATIONS,
178 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
179 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
180 #ifdef CONFIG_IPV6_PRIVACY
181 .use_tempaddr = 0,
182 .temp_valid_lft = TEMP_VALID_LIFETIME,
183 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
184 .regen_max_retry = REGEN_MAX_RETRY,
185 .max_desync_factor = MAX_DESYNC_FACTOR,
186 #endif
187 .max_addresses = IPV6_MAX_ADDRESSES,
188 };
189
190 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
191 #if 0
192 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
193 #endif
194 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
195
196 int ipv6_addr_type(const struct in6_addr *addr)
197 {
198 int type;
199 u32 st;
200
201 st = addr->s6_addr32[0];
202
203 if ((st & htonl(0xFF000000)) == htonl(0xFF000000)) {
204 type = IPV6_ADDR_MULTICAST;
205
206 switch((st & htonl(0x00FF0000))) {
207 case __constant_htonl(0x00010000):
208 type |= IPV6_ADDR_LOOPBACK;
209 break;
210
211 case __constant_htonl(0x00020000):
212 type |= IPV6_ADDR_LINKLOCAL;
213 break;
214
215 case __constant_htonl(0x00050000):
216 type |= IPV6_ADDR_SITELOCAL;
217 break;
218 };
219 return type;
220 }
221
222 type = IPV6_ADDR_UNICAST;
223
224 /* Consider all addresses with the first three bits different of
225 000 and 111 as finished.
226 */
227 if ((st & htonl(0xE0000000)) != htonl(0x00000000) &&
228 (st & htonl(0xE0000000)) != htonl(0xE0000000))
229 return type;
230
231 if ((st & htonl(0xFFC00000)) == htonl(0xFE800000))
232 return (IPV6_ADDR_LINKLOCAL | type);
233
234 if ((st & htonl(0xFFC00000)) == htonl(0xFEC00000))
235 return (IPV6_ADDR_SITELOCAL | type);
236
237 if ((addr->s6_addr32[0] | addr->s6_addr32[1]) == 0) {
238 if (addr->s6_addr32[2] == 0) {
239 if (addr->s6_addr32[3] == 0)
240 return IPV6_ADDR_ANY;
241
242 if (addr->s6_addr32[3] == htonl(0x00000001))
243 return (IPV6_ADDR_LOOPBACK | type);
244
245 return (IPV6_ADDR_COMPATv4 | type);
246 }
247
248 if (addr->s6_addr32[2] == htonl(0x0000ffff))
249 return IPV6_ADDR_MAPPED;
250 }
251
252 st &= htonl(0xFF000000);
253 if (st == 0)
254 return IPV6_ADDR_RESERVED;
255 st &= htonl(0xFE000000);
256 if (st == htonl(0x02000000))
257 return IPV6_ADDR_RESERVED; /* for NSAP */
258 if (st == htonl(0x04000000))
259 return IPV6_ADDR_RESERVED; /* for IPX */
260 return type;
261 }
262
263 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
264 {
265 if (del_timer(&ifp->timer))
266 __in6_ifa_put(ifp);
267 }
268
269 enum addrconf_timer_t
270 {
271 AC_NONE,
272 AC_DAD,
273 AC_RS,
274 };
275
276 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
277 enum addrconf_timer_t what,
278 unsigned long when)
279 {
280 if (!del_timer(&ifp->timer))
281 in6_ifa_hold(ifp);
282
283 switch (what) {
284 case AC_DAD:
285 ifp->timer.function = addrconf_dad_timer;
286 break;
287 case AC_RS:
288 ifp->timer.function = addrconf_rs_timer;
289 break;
290 default:;
291 }
292 ifp->timer.expires = jiffies + when;
293 add_timer(&ifp->timer);
294 }
295
296 /* Nobody refers to this device, we may destroy it. */
297
298 void in6_dev_finish_destroy(struct inet6_dev *idev)
299 {
300 struct net_device *dev = idev->dev;
301 BUG_TRAP(idev->addr_list==NULL);
302 BUG_TRAP(idev->mc_list==NULL);
303 #ifdef NET_REFCNT_DEBUG
304 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
305 #endif
306 dev_put(dev);
307 if (!idev->dead) {
308 printk("Freeing alive inet6 device %p\n", idev);
309 return;
310 }
311 snmp6_free_dev(idev);
312 kfree(idev);
313 }
314
315 static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
316 {
317 struct inet6_dev *ndev;
318
319 ASSERT_RTNL();
320
321 if (dev->mtu < IPV6_MIN_MTU)
322 return NULL;
323
324 ndev = kmalloc(sizeof(struct inet6_dev), GFP_KERNEL);
325
326 if (ndev) {
327 memset(ndev, 0, sizeof(struct inet6_dev));
328
329 rwlock_init(&ndev->lock);
330 ndev->dev = dev;
331 memcpy(&ndev->cnf, &ipv6_devconf_dflt, sizeof(ndev->cnf));
332 ndev->cnf.mtu6 = dev->mtu;
333 ndev->cnf.sysctl = NULL;
334 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
335 if (ndev->nd_parms == NULL) {
336 kfree(ndev);
337 return NULL;
338 }
339 /* We refer to the device */
340 dev_hold(dev);
341
342 if (snmp6_alloc_dev(ndev) < 0) {
343 ADBG((KERN_WARNING
344 "%s(): cannot allocate memory for statistics; dev=%s.\n",
345 __FUNCTION__, dev->name));
346 neigh_parms_release(&nd_tbl, ndev->nd_parms);
347 ndev->dead = 1;
348 in6_dev_finish_destroy(ndev);
349 return NULL;
350 }
351
352 if (snmp6_register_dev(ndev) < 0) {
353 ADBG((KERN_WARNING
354 "%s(): cannot create /proc/net/dev_snmp6/%s\n",
355 __FUNCTION__, dev->name));
356 neigh_parms_release(&nd_tbl, ndev->nd_parms);
357 ndev->dead = 1;
358 in6_dev_finish_destroy(ndev);
359 return NULL;
360 }
361
362 /* One reference from device. We must do this before
363 * we invoke __ipv6_regen_rndid().
364 */
365 in6_dev_hold(ndev);
366
367 #ifdef CONFIG_IPV6_PRIVACY
368 get_random_bytes(ndev->rndid, sizeof(ndev->rndid));
369 get_random_bytes(ndev->entropy, sizeof(ndev->entropy));
370 init_timer(&ndev->regen_timer);
371 ndev->regen_timer.function = ipv6_regen_rndid;
372 ndev->regen_timer.data = (unsigned long) ndev;
373 if ((dev->flags&IFF_LOOPBACK) ||
374 dev->type == ARPHRD_TUNNEL ||
375 dev->type == ARPHRD_NONE ||
376 dev->type == ARPHRD_SIT) {
377 printk(KERN_INFO
378 "Disabled Privacy Extensions on device %p(%s)\n",
379 dev, dev->name);
380 ndev->cnf.use_tempaddr = -1;
381 } else {
382 in6_dev_hold(ndev);
383 ipv6_regen_rndid((unsigned long) ndev);
384 }
385 #endif
386
387 write_lock_bh(&addrconf_lock);
388 dev->ip6_ptr = ndev;
389 write_unlock_bh(&addrconf_lock);
390
391 ipv6_mc_init_dev(ndev);
392 ndev->tstamp = jiffies;
393 #ifdef CONFIG_SYSCTL
394 neigh_sysctl_register(dev, ndev->nd_parms, NET_IPV6,
395 NET_IPV6_NEIGH, "ipv6",
396 &ndisc_ifinfo_sysctl_change,
397 NULL);
398 addrconf_sysctl_register(ndev, &ndev->cnf);
399 #endif
400 }
401 return ndev;
402 }
403
404 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
405 {
406 struct inet6_dev *idev;
407
408 ASSERT_RTNL();
409
410 if ((idev = __in6_dev_get(dev)) == NULL) {
411 if ((idev = ipv6_add_dev(dev)) == NULL)
412 return NULL;
413 }
414 if (dev->flags&IFF_UP)
415 ipv6_mc_up(idev);
416 return idev;
417 }
418
419 #ifdef CONFIG_SYSCTL
420 static void dev_forward_change(struct inet6_dev *idev)
421 {
422 struct net_device *dev;
423 struct inet6_ifaddr *ifa;
424 struct in6_addr addr;
425
426 if (!idev)
427 return;
428 dev = idev->dev;
429 if (dev && (dev->flags & IFF_MULTICAST)) {
430 ipv6_addr_all_routers(&addr);
431
432 if (idev->cnf.forwarding)
433 ipv6_dev_mc_inc(dev, &addr);
434 else
435 ipv6_dev_mc_dec(dev, &addr);
436 }
437 for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
438 if (idev->cnf.forwarding)
439 addrconf_join_anycast(ifa);
440 else
441 addrconf_leave_anycast(ifa);
442 }
443 }
444
445
446 static void addrconf_forward_change(void)
447 {
448 struct net_device *dev;
449 struct inet6_dev *idev;
450
451 read_lock(&dev_base_lock);
452 for (dev=dev_base; dev; dev=dev->next) {
453 read_lock(&addrconf_lock);
454 idev = __in6_dev_get(dev);
455 if (idev) {
456 int changed = (!idev->cnf.forwarding) ^ (!ipv6_devconf.forwarding);
457 idev->cnf.forwarding = ipv6_devconf.forwarding;
458 if (changed)
459 dev_forward_change(idev);
460 }
461 read_unlock(&addrconf_lock);
462 }
463 read_unlock(&dev_base_lock);
464 }
465 #endif
466
467 /* Nobody refers to this ifaddr, destroy it */
468
469 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
470 {
471 BUG_TRAP(ifp->if_next==NULL);
472 BUG_TRAP(ifp->lst_next==NULL);
473 #ifdef NET_REFCNT_DEBUG
474 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
475 #endif
476
477 in6_dev_put(ifp->idev);
478
479 if (del_timer(&ifp->timer))
480 printk("Timer is still running, when freeing ifa=%p\n", ifp);
481
482 if (!ifp->dead) {
483 printk("Freeing alive inet6 address %p\n", ifp);
484 return;
485 }
486 dst_release(&ifp->rt->u.dst);
487
488 kfree(ifp);
489 }
490
491 /* On success it returns ifp with increased reference count */
492
493 static struct inet6_ifaddr *
494 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
495 int scope, u32 flags)
496 {
497 struct inet6_ifaddr *ifa = NULL;
498 struct rt6_info *rt;
499 int hash;
500 int err = 0;
501
502 read_lock_bh(&addrconf_lock);
503 if (idev->dead) {
504 err = -ENODEV; /*XXX*/
505 goto out2;
506 }
507
508 write_lock(&addrconf_hash_lock);
509
510 /* Ignore adding duplicate addresses on an interface */
511 if (ipv6_chk_same_addr(addr, idev->dev)) {
512 ADBG(("ipv6_add_addr: already assigned\n"));
513 err = -EEXIST;
514 goto out;
515 }
516
517 ifa = kmalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
518
519 if (ifa == NULL) {
520 ADBG(("ipv6_add_addr: malloc failed\n"));
521 err = -ENOBUFS;
522 goto out;
523 }
524
525 rt = addrconf_dst_alloc(idev, addr, 0);
526 if (IS_ERR(rt)) {
527 err = PTR_ERR(rt);
528 goto out;
529 }
530
531 memset(ifa, 0, sizeof(struct inet6_ifaddr));
532 ipv6_addr_copy(&ifa->addr, addr);
533
534 spin_lock_init(&ifa->lock);
535 init_timer(&ifa->timer);
536 ifa->timer.data = (unsigned long) ifa;
537 ifa->scope = scope;
538 ifa->prefix_len = pfxlen;
539 ifa->flags = flags | IFA_F_TENTATIVE;
540 ifa->cstamp = ifa->tstamp = jiffies;
541
542 ifa->idev = idev;
543 in6_dev_hold(idev);
544 /* For caller */
545 in6_ifa_hold(ifa);
546
547 /* Add to big hash table */
548 hash = ipv6_addr_hash(addr);
549
550 ifa->lst_next = inet6_addr_lst[hash];
551 inet6_addr_lst[hash] = ifa;
552 in6_ifa_hold(ifa);
553 write_unlock(&addrconf_hash_lock);
554
555 write_lock(&idev->lock);
556 /* Add to inet6_dev unicast addr list. */
557 ifa->if_next = idev->addr_list;
558 idev->addr_list = ifa;
559
560 #ifdef CONFIG_IPV6_PRIVACY
561 if (ifa->flags&IFA_F_TEMPORARY) {
562 ifa->tmp_next = idev->tempaddr_list;
563 idev->tempaddr_list = ifa;
564 in6_ifa_hold(ifa);
565 }
566 #endif
567
568 ifa->rt = rt;
569
570 in6_ifa_hold(ifa);
571 write_unlock(&idev->lock);
572 out2:
573 read_unlock_bh(&addrconf_lock);
574
575 if (likely(err == 0))
576 notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
577 else {
578 kfree(ifa);
579 ifa = ERR_PTR(err);
580 }
581
582 return ifa;
583 out:
584 write_unlock(&addrconf_hash_lock);
585 goto out2;
586 }
587
588 /* This function wants to get referenced ifp and releases it before return */
589
590 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
591 {
592 struct inet6_ifaddr *ifa, **ifap;
593 struct inet6_dev *idev = ifp->idev;
594 int hash;
595 int deleted = 0, onlink = 0;
596 unsigned long expires = jiffies;
597
598 hash = ipv6_addr_hash(&ifp->addr);
599
600 ifp->dead = 1;
601
602 write_lock_bh(&addrconf_hash_lock);
603 for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
604 ifap = &ifa->lst_next) {
605 if (ifa == ifp) {
606 *ifap = ifa->lst_next;
607 __in6_ifa_put(ifp);
608 ifa->lst_next = NULL;
609 break;
610 }
611 }
612 write_unlock_bh(&addrconf_hash_lock);
613
614 write_lock_bh(&idev->lock);
615 #ifdef CONFIG_IPV6_PRIVACY
616 if (ifp->flags&IFA_F_TEMPORARY) {
617 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
618 ifap = &ifa->tmp_next) {
619 if (ifa == ifp) {
620 *ifap = ifa->tmp_next;
621 if (ifp->ifpub) {
622 in6_ifa_put(ifp->ifpub);
623 ifp->ifpub = NULL;
624 }
625 __in6_ifa_put(ifp);
626 ifa->tmp_next = NULL;
627 break;
628 }
629 }
630 }
631 #endif
632
633 for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;
634 ifap = &ifa->if_next) {
635 if (ifa == ifp) {
636 *ifap = ifa->if_next;
637 __in6_ifa_put(ifp);
638 ifa->if_next = NULL;
639 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
640 break;
641 deleted = 1;
642 } else if (ifp->flags & IFA_F_PERMANENT) {
643 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
644 ifp->prefix_len)) {
645 if (ifa->flags & IFA_F_PERMANENT) {
646 onlink = 1;
647 if (deleted)
648 break;
649 } else {
650 unsigned long lifetime;
651
652 if (!onlink)
653 onlink = -1;
654
655 spin_lock(&ifa->lock);
656 lifetime = min_t(unsigned long,
657 ifa->valid_lft, 0x7fffffffUL/HZ);
658 if (time_before(expires,
659 ifa->tstamp + lifetime * HZ))
660 expires = ifa->tstamp + lifetime * HZ;
661 spin_unlock(&ifa->lock);
662 }
663 }
664 }
665 }
666 write_unlock_bh(&idev->lock);
667
668 ipv6_ifa_notify(RTM_DELADDR, ifp);
669
670 notifier_call_chain(&inet6addr_chain,NETDEV_DOWN,ifp);
671
672 addrconf_del_timer(ifp);
673
674 /*
675 * Purge or update corresponding prefix
676 *
677 * 1) we don't purge prefix here if address was not permanent.
678 * prefix is managed by its own lifetime.
679 * 2) if there're no addresses, delete prefix.
680 * 3) if there're still other permanent address(es),
681 * corresponding prefix is still permanent.
682 * 4) otherwise, update prefix lifetime to the
683 * longest valid lifetime among the corresponding
684 * addresses on the device.
685 * Note: subsequent RA will update lifetime.
686 *
687 * --yoshfuji
688 */
689 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
690 struct in6_addr prefix;
691 struct rt6_info *rt;
692
693 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
694 rt = rt6_lookup(&prefix, NULL, ifp->idev->dev->ifindex, 1);
695
696 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
697 if (onlink == 0) {
698 ip6_del_rt(rt, NULL, NULL, NULL);
699 rt = NULL;
700 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
701 rt->rt6i_expires = expires;
702 rt->rt6i_flags |= RTF_EXPIRES;
703 }
704 }
705 dst_release(&rt->u.dst);
706 }
707
708 in6_ifa_put(ifp);
709 }
710
711 #ifdef CONFIG_IPV6_PRIVACY
712 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
713 {
714 struct inet6_dev *idev = ifp->idev;
715 struct in6_addr addr, *tmpaddr;
716 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
717 int tmp_plen;
718 int ret = 0;
719 int max_addresses;
720
721 write_lock(&idev->lock);
722 if (ift) {
723 spin_lock_bh(&ift->lock);
724 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
725 spin_unlock_bh(&ift->lock);
726 tmpaddr = &addr;
727 } else {
728 tmpaddr = NULL;
729 }
730 retry:
731 in6_dev_hold(idev);
732 if (idev->cnf.use_tempaddr <= 0) {
733 write_unlock(&idev->lock);
734 printk(KERN_INFO
735 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
736 in6_dev_put(idev);
737 ret = -1;
738 goto out;
739 }
740 spin_lock_bh(&ifp->lock);
741 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
742 idev->cnf.use_tempaddr = -1; /*XXX*/
743 spin_unlock_bh(&ifp->lock);
744 write_unlock(&idev->lock);
745 printk(KERN_WARNING
746 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
747 in6_dev_put(idev);
748 ret = -1;
749 goto out;
750 }
751 in6_ifa_hold(ifp);
752 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
753 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
754 spin_unlock_bh(&ifp->lock);
755 write_unlock(&idev->lock);
756 printk(KERN_WARNING
757 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
758 in6_ifa_put(ifp);
759 in6_dev_put(idev);
760 ret = -1;
761 goto out;
762 }
763 memcpy(&addr.s6_addr[8], idev->rndid, 8);
764 tmp_valid_lft = min_t(__u32,
765 ifp->valid_lft,
766 idev->cnf.temp_valid_lft);
767 tmp_prefered_lft = min_t(__u32,
768 ifp->prefered_lft,
769 idev->cnf.temp_prefered_lft - desync_factor / HZ);
770 tmp_plen = ifp->prefix_len;
771 max_addresses = idev->cnf.max_addresses;
772 tmp_cstamp = ifp->cstamp;
773 tmp_tstamp = ifp->tstamp;
774 spin_unlock_bh(&ifp->lock);
775
776 write_unlock(&idev->lock);
777 ift = !max_addresses ||
778 ipv6_count_addresses(idev) < max_addresses ?
779 ipv6_add_addr(idev, &addr, tmp_plen,
780 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK, IFA_F_TEMPORARY) : NULL;
781 if (!ift || IS_ERR(ift)) {
782 in6_ifa_put(ifp);
783 in6_dev_put(idev);
784 printk(KERN_INFO
785 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
786 tmpaddr = &addr;
787 write_lock(&idev->lock);
788 goto retry;
789 }
790
791 spin_lock_bh(&ift->lock);
792 ift->ifpub = ifp;
793 ift->valid_lft = tmp_valid_lft;
794 ift->prefered_lft = tmp_prefered_lft;
795 ift->cstamp = tmp_cstamp;
796 ift->tstamp = tmp_tstamp;
797 spin_unlock_bh(&ift->lock);
798
799 addrconf_dad_start(ift, 0);
800 in6_ifa_put(ift);
801 in6_dev_put(idev);
802 out:
803 return ret;
804 }
805 #endif
806
807 /*
808 * Choose an appropriate source address
809 * should do:
810 * i) get an address with an appropriate scope
811 * ii) see if there is a specific route for the destination and use
812 * an address of the attached interface
813 * iii) don't use deprecated addresses
814 */
815 static int inline ipv6_saddr_pref(const struct inet6_ifaddr *ifp, u8 invpref)
816 {
817 int pref;
818 pref = ifp->flags&IFA_F_DEPRECATED ? 0 : 2;
819 #ifdef CONFIG_IPV6_PRIVACY
820 pref |= (ifp->flags^invpref)&IFA_F_TEMPORARY ? 0 : 1;
821 #endif
822 return pref;
823 }
824
825 #ifdef CONFIG_IPV6_PRIVACY
826 #define IPV6_GET_SADDR_MAXSCORE(score) ((score) == 3)
827 #else
828 #define IPV6_GET_SADDR_MAXSCORE(score) (score)
829 #endif
830
831 int ipv6_dev_get_saddr(struct net_device *dev,
832 struct in6_addr *daddr, struct in6_addr *saddr)
833 {
834 struct inet6_ifaddr *ifp = NULL;
835 struct inet6_ifaddr *match = NULL;
836 struct inet6_dev *idev;
837 int scope;
838 int err;
839 int hiscore = -1, score;
840
841 scope = ipv6_addr_scope(daddr);
842
843 /*
844 * known dev
845 * search dev and walk through dev addresses
846 */
847
848 if (dev) {
849 if (dev->flags & IFF_LOOPBACK)
850 scope = IFA_HOST;
851
852 read_lock(&addrconf_lock);
853 idev = __in6_dev_get(dev);
854 if (idev) {
855 read_lock_bh(&idev->lock);
856 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
857 if (ifp->scope == scope) {
858 if (ifp->flags&IFA_F_TENTATIVE)
859 continue;
860 #ifdef CONFIG_IPV6_PRIVACY
861 score = ipv6_saddr_pref(ifp, idev->cnf.use_tempaddr > 1 ? IFA_F_TEMPORARY : 0);
862 #else
863 score = ipv6_saddr_pref(ifp, 0);
864 #endif
865 if (score <= hiscore)
866 continue;
867
868 if (match)
869 in6_ifa_put(match);
870 match = ifp;
871 hiscore = score;
872 in6_ifa_hold(ifp);
873
874 if (IPV6_GET_SADDR_MAXSCORE(score)) {
875 read_unlock_bh(&idev->lock);
876 read_unlock(&addrconf_lock);
877 goto out;
878 }
879 }
880 }
881 read_unlock_bh(&idev->lock);
882 }
883 read_unlock(&addrconf_lock);
884 }
885
886 if (scope == IFA_LINK)
887 goto out;
888
889 /*
890 * dev == NULL or search failed for specified dev
891 */
892
893 read_lock(&dev_base_lock);
894 read_lock(&addrconf_lock);
895 for (dev = dev_base; dev; dev=dev->next) {
896 idev = __in6_dev_get(dev);
897 if (idev) {
898 read_lock_bh(&idev->lock);
899 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
900 if (ifp->scope == scope) {
901 if (ifp->flags&IFA_F_TENTATIVE)
902 continue;
903 #ifdef CONFIG_IPV6_PRIVACY
904 score = ipv6_saddr_pref(ifp, idev->cnf.use_tempaddr > 1 ? IFA_F_TEMPORARY : 0);
905 #else
906 score = ipv6_saddr_pref(ifp, 0);
907 #endif
908 if (score <= hiscore)
909 continue;
910
911 if (match)
912 in6_ifa_put(match);
913 match = ifp;
914 hiscore = score;
915 in6_ifa_hold(ifp);
916
917 if (IPV6_GET_SADDR_MAXSCORE(score)) {
918 read_unlock_bh(&idev->lock);
919 goto out_unlock_base;
920 }
921 }
922 }
923 read_unlock_bh(&idev->lock);
924 }
925 }
926
927 out_unlock_base:
928 read_unlock(&addrconf_lock);
929 read_unlock(&dev_base_lock);
930
931 out:
932 err = -EADDRNOTAVAIL;
933 if (match) {
934 ipv6_addr_copy(saddr, &match->addr);
935 err = 0;
936 in6_ifa_put(match);
937 }
938
939 return err;
940 }
941
942
943 int ipv6_get_saddr(struct dst_entry *dst,
944 struct in6_addr *daddr, struct in6_addr *saddr)
945 {
946 return ipv6_dev_get_saddr(dst ? ((struct rt6_info *)dst)->rt6i_idev->dev : NULL, daddr, saddr);
947 }
948
949
950 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr)
951 {
952 struct inet6_dev *idev;
953 int err = -EADDRNOTAVAIL;
954
955 read_lock(&addrconf_lock);
956 if ((idev = __in6_dev_get(dev)) != NULL) {
957 struct inet6_ifaddr *ifp;
958
959 read_lock_bh(&idev->lock);
960 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
961 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
962 ipv6_addr_copy(addr, &ifp->addr);
963 err = 0;
964 break;
965 }
966 }
967 read_unlock_bh(&idev->lock);
968 }
969 read_unlock(&addrconf_lock);
970 return err;
971 }
972
973 static int ipv6_count_addresses(struct inet6_dev *idev)
974 {
975 int cnt = 0;
976 struct inet6_ifaddr *ifp;
977
978 read_lock_bh(&idev->lock);
979 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
980 cnt++;
981 read_unlock_bh(&idev->lock);
982 return cnt;
983 }
984
985 int ipv6_chk_addr(struct in6_addr *addr, struct net_device *dev, int strict)
986 {
987 struct inet6_ifaddr * ifp;
988 u8 hash = ipv6_addr_hash(addr);
989
990 read_lock_bh(&addrconf_hash_lock);
991 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
992 if (ipv6_addr_equal(&ifp->addr, addr) &&
993 !(ifp->flags&IFA_F_TENTATIVE)) {
994 if (dev == NULL || ifp->idev->dev == dev ||
995 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
996 break;
997 }
998 }
999 read_unlock_bh(&addrconf_hash_lock);
1000 return ifp != NULL;
1001 }
1002
1003 static
1004 int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev)
1005 {
1006 struct inet6_ifaddr * ifp;
1007 u8 hash = ipv6_addr_hash(addr);
1008
1009 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1010 if (ipv6_addr_equal(&ifp->addr, addr)) {
1011 if (dev == NULL || ifp->idev->dev == dev)
1012 break;
1013 }
1014 }
1015 return ifp != NULL;
1016 }
1017
1018 struct inet6_ifaddr * ipv6_get_ifaddr(struct in6_addr *addr, struct net_device *dev, int strict)
1019 {
1020 struct inet6_ifaddr * ifp;
1021 u8 hash = ipv6_addr_hash(addr);
1022
1023 read_lock_bh(&addrconf_hash_lock);
1024 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1025 if (ipv6_addr_equal(&ifp->addr, addr)) {
1026 if (dev == NULL || ifp->idev->dev == dev ||
1027 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1028 in6_ifa_hold(ifp);
1029 break;
1030 }
1031 }
1032 }
1033 read_unlock_bh(&addrconf_hash_lock);
1034
1035 return ifp;
1036 }
1037
1038 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1039 {
1040 const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
1041 const struct in6_addr *sk2_rcv_saddr6 = tcp_v6_rcv_saddr(sk2);
1042 u32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
1043 u32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1044 int sk_ipv6only = ipv6_only_sock(sk);
1045 int sk2_ipv6only = inet_v6_ipv6only(sk2);
1046 int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1047 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1048
1049 if (!sk2_rcv_saddr && !sk_ipv6only)
1050 return 1;
1051
1052 if (addr_type2 == IPV6_ADDR_ANY &&
1053 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1054 return 1;
1055
1056 if (addr_type == IPV6_ADDR_ANY &&
1057 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1058 return 1;
1059
1060 if (sk2_rcv_saddr6 &&
1061 ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1062 return 1;
1063
1064 if (addr_type == IPV6_ADDR_MAPPED &&
1065 !sk2_ipv6only &&
1066 (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1067 return 1;
1068
1069 return 0;
1070 }
1071
1072 /* Gets referenced address, destroys ifaddr */
1073
1074 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1075 {
1076 if (net_ratelimit())
1077 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1078 if (ifp->flags&IFA_F_PERMANENT) {
1079 spin_lock_bh(&ifp->lock);
1080 addrconf_del_timer(ifp);
1081 ifp->flags |= IFA_F_TENTATIVE;
1082 spin_unlock_bh(&ifp->lock);
1083 in6_ifa_put(ifp);
1084 #ifdef CONFIG_IPV6_PRIVACY
1085 } else if (ifp->flags&IFA_F_TEMPORARY) {
1086 struct inet6_ifaddr *ifpub;
1087 spin_lock_bh(&ifp->lock);
1088 ifpub = ifp->ifpub;
1089 if (ifpub) {
1090 in6_ifa_hold(ifpub);
1091 spin_unlock_bh(&ifp->lock);
1092 ipv6_create_tempaddr(ifpub, ifp);
1093 in6_ifa_put(ifpub);
1094 } else {
1095 spin_unlock_bh(&ifp->lock);
1096 }
1097 ipv6_del_addr(ifp);
1098 #endif
1099 } else
1100 ipv6_del_addr(ifp);
1101 }
1102
1103
1104 /* Join to solicited addr multicast group. */
1105
1106 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1107 {
1108 struct in6_addr maddr;
1109
1110 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1111 return;
1112
1113 addrconf_addr_solict_mult(addr, &maddr);
1114 ipv6_dev_mc_inc(dev, &maddr);
1115 }
1116
1117 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1118 {
1119 struct in6_addr maddr;
1120
1121 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1122 return;
1123
1124 addrconf_addr_solict_mult(addr, &maddr);
1125 __ipv6_dev_mc_dec(idev, &maddr);
1126 }
1127
1128 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1129 {
1130 struct in6_addr addr;
1131 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1132 if (ipv6_addr_any(&addr))
1133 return;
1134 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1135 }
1136
1137 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1138 {
1139 struct in6_addr addr;
1140 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1141 if (ipv6_addr_any(&addr))
1142 return;
1143 __ipv6_dev_ac_dec(ifp->idev, &addr);
1144 }
1145
1146 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1147 {
1148 switch (dev->type) {
1149 case ARPHRD_ETHER:
1150 case ARPHRD_FDDI:
1151 case ARPHRD_IEEE802_TR:
1152 if (dev->addr_len != ETH_ALEN)
1153 return -1;
1154 memcpy(eui, dev->dev_addr, 3);
1155 memcpy(eui + 5, dev->dev_addr + 3, 3);
1156
1157 /*
1158 * The zSeries OSA network cards can be shared among various
1159 * OS instances, but the OSA cards have only one MAC address.
1160 * This leads to duplicate address conflicts in conjunction
1161 * with IPv6 if more than one instance uses the same card.
1162 *
1163 * The driver for these cards can deliver a unique 16-bit
1164 * identifier for each instance sharing the same card. It is
1165 * placed instead of 0xFFFE in the interface identifier. The
1166 * "u" bit of the interface identifier is not inverted in this
1167 * case. Hence the resulting interface identifier has local
1168 * scope according to RFC2373.
1169 */
1170 if (dev->dev_id) {
1171 eui[3] = (dev->dev_id >> 8) & 0xFF;
1172 eui[4] = dev->dev_id & 0xFF;
1173 } else {
1174 eui[3] = 0xFF;
1175 eui[4] = 0xFE;
1176 eui[0] ^= 2;
1177 }
1178 return 0;
1179 case ARPHRD_ARCNET:
1180 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1181 if (dev->addr_len != ARCNET_ALEN)
1182 return -1;
1183 memset(eui, 0, 7);
1184 eui[7] = *(u8*)dev->dev_addr;
1185 return 0;
1186 case ARPHRD_INFINIBAND:
1187 if (dev->addr_len != INFINIBAND_ALEN)
1188 return -1;
1189 memcpy(eui, dev->dev_addr + 12, 8);
1190 eui[0] |= 2;
1191 return 0;
1192 }
1193 return -1;
1194 }
1195
1196 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1197 {
1198 int err = -1;
1199 struct inet6_ifaddr *ifp;
1200
1201 read_lock_bh(&idev->lock);
1202 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1203 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1204 memcpy(eui, ifp->addr.s6_addr+8, 8);
1205 err = 0;
1206 break;
1207 }
1208 }
1209 read_unlock_bh(&idev->lock);
1210 return err;
1211 }
1212
1213 #ifdef CONFIG_IPV6_PRIVACY
1214 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1215 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1216 {
1217 struct net_device *dev;
1218 struct scatterlist sg[2];
1219
1220 sg[0].page = virt_to_page(idev->entropy);
1221 sg[0].offset = offset_in_page(idev->entropy);
1222 sg[0].length = 8;
1223 sg[1].page = virt_to_page(idev->work_eui64);
1224 sg[1].offset = offset_in_page(idev->work_eui64);
1225 sg[1].length = 8;
1226
1227 dev = idev->dev;
1228
1229 if (ipv6_generate_eui64(idev->work_eui64, dev)) {
1230 printk(KERN_INFO
1231 "__ipv6_regen_rndid(idev=%p): cannot get EUI64 identifier; use random bytes.\n",
1232 idev);
1233 get_random_bytes(idev->work_eui64, sizeof(idev->work_eui64));
1234 }
1235 regen:
1236 spin_lock(&md5_tfm_lock);
1237 if (unlikely(md5_tfm == NULL)) {
1238 spin_unlock(&md5_tfm_lock);
1239 return -1;
1240 }
1241 crypto_digest_init(md5_tfm);
1242 crypto_digest_update(md5_tfm, sg, 2);
1243 crypto_digest_final(md5_tfm, idev->work_digest);
1244 spin_unlock(&md5_tfm_lock);
1245
1246 memcpy(idev->rndid, &idev->work_digest[0], 8);
1247 idev->rndid[0] &= ~0x02;
1248 memcpy(idev->entropy, &idev->work_digest[8], 8);
1249
1250 /*
1251 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1252 * check if generated address is not inappropriate
1253 *
1254 * - Reserved subnet anycast (RFC 2526)
1255 * 11111101 11....11 1xxxxxxx
1256 * - ISATAP (draft-ietf-ngtrans-isatap-13.txt) 5.1
1257 * 00-00-5E-FE-xx-xx-xx-xx
1258 * - value 0
1259 * - XXX: already assigned to an address on the device
1260 */
1261 if (idev->rndid[0] == 0xfd &&
1262 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1263 (idev->rndid[7]&0x80))
1264 goto regen;
1265 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1266 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1267 goto regen;
1268 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1269 goto regen;
1270 }
1271
1272 return 0;
1273 }
1274
1275 static void ipv6_regen_rndid(unsigned long data)
1276 {
1277 struct inet6_dev *idev = (struct inet6_dev *) data;
1278 unsigned long expires;
1279
1280 read_lock_bh(&addrconf_lock);
1281 write_lock_bh(&idev->lock);
1282
1283 if (idev->dead)
1284 goto out;
1285
1286 if (__ipv6_regen_rndid(idev) < 0)
1287 goto out;
1288
1289 expires = jiffies +
1290 idev->cnf.temp_prefered_lft * HZ -
1291 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1292 if (time_before(expires, jiffies)) {
1293 printk(KERN_WARNING
1294 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1295 idev->dev->name);
1296 goto out;
1297 }
1298
1299 if (!mod_timer(&idev->regen_timer, expires))
1300 in6_dev_hold(idev);
1301
1302 out:
1303 write_unlock_bh(&idev->lock);
1304 read_unlock_bh(&addrconf_lock);
1305 in6_dev_put(idev);
1306 }
1307
1308 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1309 int ret = 0;
1310
1311 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1312 ret = __ipv6_regen_rndid(idev);
1313 return ret;
1314 }
1315 #endif
1316
1317 /*
1318 * Add prefix route.
1319 */
1320
1321 static void
1322 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1323 unsigned long expires, u32 flags)
1324 {
1325 struct in6_rtmsg rtmsg;
1326
1327 memset(&rtmsg, 0, sizeof(rtmsg));
1328 ipv6_addr_copy(&rtmsg.rtmsg_dst, pfx);
1329 rtmsg.rtmsg_dst_len = plen;
1330 rtmsg.rtmsg_metric = IP6_RT_PRIO_ADDRCONF;
1331 rtmsg.rtmsg_ifindex = dev->ifindex;
1332 rtmsg.rtmsg_info = expires;
1333 rtmsg.rtmsg_flags = RTF_UP|flags;
1334 rtmsg.rtmsg_type = RTMSG_NEWROUTE;
1335
1336 /* Prevent useless cloning on PtP SIT.
1337 This thing is done here expecting that the whole
1338 class of non-broadcast devices need not cloning.
1339 */
1340 if (dev->type == ARPHRD_SIT && (dev->flags&IFF_POINTOPOINT))
1341 rtmsg.rtmsg_flags |= RTF_NONEXTHOP;
1342
1343 ip6_route_add(&rtmsg, NULL, NULL, NULL);
1344 }
1345
1346 /* Create "default" multicast route to the interface */
1347
1348 static void addrconf_add_mroute(struct net_device *dev)
1349 {
1350 struct in6_rtmsg rtmsg;
1351
1352 memset(&rtmsg, 0, sizeof(rtmsg));
1353 ipv6_addr_set(&rtmsg.rtmsg_dst,
1354 htonl(0xFF000000), 0, 0, 0);
1355 rtmsg.rtmsg_dst_len = 8;
1356 rtmsg.rtmsg_metric = IP6_RT_PRIO_ADDRCONF;
1357 rtmsg.rtmsg_ifindex = dev->ifindex;
1358 rtmsg.rtmsg_flags = RTF_UP;
1359 rtmsg.rtmsg_type = RTMSG_NEWROUTE;
1360 ip6_route_add(&rtmsg, NULL, NULL, NULL);
1361 }
1362
1363 static void sit_route_add(struct net_device *dev)
1364 {
1365 struct in6_rtmsg rtmsg;
1366
1367 memset(&rtmsg, 0, sizeof(rtmsg));
1368
1369 rtmsg.rtmsg_type = RTMSG_NEWROUTE;
1370 rtmsg.rtmsg_metric = IP6_RT_PRIO_ADDRCONF;
1371
1372 /* prefix length - 96 bits "::d.d.d.d" */
1373 rtmsg.rtmsg_dst_len = 96;
1374 rtmsg.rtmsg_flags = RTF_UP|RTF_NONEXTHOP;
1375 rtmsg.rtmsg_ifindex = dev->ifindex;
1376
1377 ip6_route_add(&rtmsg, NULL, NULL, NULL);
1378 }
1379
1380 static void addrconf_add_lroute(struct net_device *dev)
1381 {
1382 struct in6_addr addr;
1383
1384 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1385 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1386 }
1387
1388 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1389 {
1390 struct inet6_dev *idev;
1391
1392 ASSERT_RTNL();
1393
1394 if ((idev = ipv6_find_idev(dev)) == NULL)
1395 return NULL;
1396
1397 /* Add default multicast route */
1398 addrconf_add_mroute(dev);
1399
1400 /* Add link local route */
1401 addrconf_add_lroute(dev);
1402 return idev;
1403 }
1404
1405 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1406 {
1407 struct prefix_info *pinfo;
1408 __u32 valid_lft;
1409 __u32 prefered_lft;
1410 int addr_type;
1411 unsigned long rt_expires;
1412 struct inet6_dev *in6_dev;
1413
1414 pinfo = (struct prefix_info *) opt;
1415
1416 if (len < sizeof(struct prefix_info)) {
1417 ADBG(("addrconf: prefix option too short\n"));
1418 return;
1419 }
1420
1421 /*
1422 * Validation checks ([ADDRCONF], page 19)
1423 */
1424
1425 addr_type = ipv6_addr_type(&pinfo->prefix);
1426
1427 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1428 return;
1429
1430 valid_lft = ntohl(pinfo->valid);
1431 prefered_lft = ntohl(pinfo->prefered);
1432
1433 if (prefered_lft > valid_lft) {
1434 if (net_ratelimit())
1435 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1436 return;
1437 }
1438
1439 in6_dev = in6_dev_get(dev);
1440
1441 if (in6_dev == NULL) {
1442 if (net_ratelimit())
1443 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1444 return;
1445 }
1446
1447 /*
1448 * Two things going on here:
1449 * 1) Add routes for on-link prefixes
1450 * 2) Configure prefixes with the auto flag set
1451 */
1452
1453 /* Avoid arithmetic overflow. Really, we could
1454 save rt_expires in seconds, likely valid_lft,
1455 but it would require division in fib gc, that it
1456 not good.
1457 */
1458 if (valid_lft >= 0x7FFFFFFF/HZ)
1459 rt_expires = 0;
1460 else
1461 rt_expires = jiffies + valid_lft * HZ;
1462
1463 if (pinfo->onlink) {
1464 struct rt6_info *rt;
1465 rt = rt6_lookup(&pinfo->prefix, NULL, dev->ifindex, 1);
1466
1467 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
1468 if (rt->rt6i_flags&RTF_EXPIRES) {
1469 if (valid_lft == 0) {
1470 ip6_del_rt(rt, NULL, NULL, NULL);
1471 rt = NULL;
1472 } else {
1473 rt->rt6i_expires = rt_expires;
1474 }
1475 }
1476 } else if (valid_lft) {
1477 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1478 dev, rt_expires, RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT);
1479 }
1480 if (rt)
1481 dst_release(&rt->u.dst);
1482 }
1483
1484 /* Try to figure out our local address for this prefix */
1485
1486 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1487 struct inet6_ifaddr * ifp;
1488 struct in6_addr addr;
1489 int create = 0, update_lft = 0;
1490
1491 if (pinfo->prefix_len == 64) {
1492 memcpy(&addr, &pinfo->prefix, 8);
1493 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1494 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1495 in6_dev_put(in6_dev);
1496 return;
1497 }
1498 goto ok;
1499 }
1500 if (net_ratelimit())
1501 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1502 pinfo->prefix_len);
1503 in6_dev_put(in6_dev);
1504 return;
1505
1506 ok:
1507
1508 ifp = ipv6_get_ifaddr(&addr, dev, 1);
1509
1510 if (ifp == NULL && valid_lft) {
1511 int max_addresses = in6_dev->cnf.max_addresses;
1512
1513 /* Do not allow to create too much of autoconfigured
1514 * addresses; this would be too easy way to crash kernel.
1515 */
1516 if (!max_addresses ||
1517 ipv6_count_addresses(in6_dev) < max_addresses)
1518 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1519 addr_type&IPV6_ADDR_SCOPE_MASK, 0);
1520
1521 if (!ifp || IS_ERR(ifp)) {
1522 in6_dev_put(in6_dev);
1523 return;
1524 }
1525
1526 update_lft = create = 1;
1527 ifp->cstamp = jiffies;
1528 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1529 }
1530
1531 if (ifp) {
1532 int flags;
1533 unsigned long now;
1534 #ifdef CONFIG_IPV6_PRIVACY
1535 struct inet6_ifaddr *ift;
1536 #endif
1537 u32 stored_lft;
1538
1539 /* update lifetime (RFC2462 5.5.3 e) */
1540 spin_lock(&ifp->lock);
1541 now = jiffies;
1542 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1543 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1544 else
1545 stored_lft = 0;
1546 if (!update_lft && stored_lft) {
1547 if (valid_lft > MIN_VALID_LIFETIME ||
1548 valid_lft > stored_lft)
1549 update_lft = 1;
1550 else if (stored_lft <= MIN_VALID_LIFETIME) {
1551 /* valid_lft <= stored_lft is always true */
1552 /* XXX: IPsec */
1553 update_lft = 0;
1554 } else {
1555 valid_lft = MIN_VALID_LIFETIME;
1556 if (valid_lft < prefered_lft)
1557 prefered_lft = valid_lft;
1558 update_lft = 1;
1559 }
1560 }
1561
1562 if (update_lft) {
1563 ifp->valid_lft = valid_lft;
1564 ifp->prefered_lft = prefered_lft;
1565 ifp->tstamp = now;
1566 flags = ifp->flags;
1567 ifp->flags &= ~IFA_F_DEPRECATED;
1568 spin_unlock(&ifp->lock);
1569
1570 if (!(flags&IFA_F_TENTATIVE))
1571 ipv6_ifa_notify(0, ifp);
1572 } else
1573 spin_unlock(&ifp->lock);
1574
1575 #ifdef CONFIG_IPV6_PRIVACY
1576 read_lock_bh(&in6_dev->lock);
1577 /* update all temporary addresses in the list */
1578 for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1579 /*
1580 * When adjusting the lifetimes of an existing
1581 * temporary address, only lower the lifetimes.
1582 * Implementations must not increase the
1583 * lifetimes of an existing temporary address
1584 * when processing a Prefix Information Option.
1585 */
1586 spin_lock(&ift->lock);
1587 flags = ift->flags;
1588 if (ift->valid_lft > valid_lft &&
1589 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1590 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1591 if (ift->prefered_lft > prefered_lft &&
1592 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1593 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1594 spin_unlock(&ift->lock);
1595 if (!(flags&IFA_F_TENTATIVE))
1596 ipv6_ifa_notify(0, ift);
1597 }
1598
1599 if (create && in6_dev->cnf.use_tempaddr > 0) {
1600 /*
1601 * When a new public address is created as described in [ADDRCONF],
1602 * also create a new temporary address.
1603 */
1604 read_unlock_bh(&in6_dev->lock);
1605 ipv6_create_tempaddr(ifp, NULL);
1606 } else {
1607 read_unlock_bh(&in6_dev->lock);
1608 }
1609 #endif
1610 in6_ifa_put(ifp);
1611 addrconf_verify(0);
1612 }
1613 }
1614 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
1615 in6_dev_put(in6_dev);
1616 }
1617
1618 /*
1619 * Set destination address.
1620 * Special case for SIT interfaces where we create a new "virtual"
1621 * device.
1622 */
1623 int addrconf_set_dstaddr(void __user *arg)
1624 {
1625 struct in6_ifreq ireq;
1626 struct net_device *dev;
1627 int err = -EINVAL;
1628
1629 rtnl_lock();
1630
1631 err = -EFAULT;
1632 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1633 goto err_exit;
1634
1635 dev = __dev_get_by_index(ireq.ifr6_ifindex);
1636
1637 err = -ENODEV;
1638 if (dev == NULL)
1639 goto err_exit;
1640
1641 if (dev->type == ARPHRD_SIT) {
1642 struct ifreq ifr;
1643 mm_segment_t oldfs;
1644 struct ip_tunnel_parm p;
1645
1646 err = -EADDRNOTAVAIL;
1647 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
1648 goto err_exit;
1649
1650 memset(&p, 0, sizeof(p));
1651 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
1652 p.iph.saddr = 0;
1653 p.iph.version = 4;
1654 p.iph.ihl = 5;
1655 p.iph.protocol = IPPROTO_IPV6;
1656 p.iph.ttl = 64;
1657 ifr.ifr_ifru.ifru_data = (void __user *)&p;
1658
1659 oldfs = get_fs(); set_fs(KERNEL_DS);
1660 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
1661 set_fs(oldfs);
1662
1663 if (err == 0) {
1664 err = -ENOBUFS;
1665 if ((dev = __dev_get_by_name(p.name)) == NULL)
1666 goto err_exit;
1667 err = dev_open(dev);
1668 }
1669 }
1670
1671 err_exit:
1672 rtnl_unlock();
1673 return err;
1674 }
1675
1676 /*
1677 * Manual configuration of address on an interface
1678 */
1679 static int inet6_addr_add(int ifindex, struct in6_addr *pfx, int plen)
1680 {
1681 struct inet6_ifaddr *ifp;
1682 struct inet6_dev *idev;
1683 struct net_device *dev;
1684 int scope;
1685
1686 ASSERT_RTNL();
1687
1688 if ((dev = __dev_get_by_index(ifindex)) == NULL)
1689 return -ENODEV;
1690
1691 if (!(dev->flags&IFF_UP))
1692 return -ENETDOWN;
1693
1694 if ((idev = addrconf_add_dev(dev)) == NULL)
1695 return -ENOBUFS;
1696
1697 scope = ipv6_addr_scope(pfx);
1698
1699 ifp = ipv6_add_addr(idev, pfx, plen, scope, IFA_F_PERMANENT);
1700 if (!IS_ERR(ifp)) {
1701 addrconf_dad_start(ifp, 0);
1702 in6_ifa_put(ifp);
1703 return 0;
1704 }
1705
1706 return PTR_ERR(ifp);
1707 }
1708
1709 static int inet6_addr_del(int ifindex, struct in6_addr *pfx, int plen)
1710 {
1711 struct inet6_ifaddr *ifp;
1712 struct inet6_dev *idev;
1713 struct net_device *dev;
1714
1715 if ((dev = __dev_get_by_index(ifindex)) == NULL)
1716 return -ENODEV;
1717
1718 if ((idev = __in6_dev_get(dev)) == NULL)
1719 return -ENXIO;
1720
1721 read_lock_bh(&idev->lock);
1722 for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
1723 if (ifp->prefix_len == plen &&
1724 ipv6_addr_equal(pfx, &ifp->addr)) {
1725 in6_ifa_hold(ifp);
1726 read_unlock_bh(&idev->lock);
1727
1728 ipv6_del_addr(ifp);
1729
1730 /* If the last address is deleted administratively,
1731 disable IPv6 on this interface.
1732 */
1733 if (idev->addr_list == NULL)
1734 addrconf_ifdown(idev->dev, 1);
1735 return 0;
1736 }
1737 }
1738 read_unlock_bh(&idev->lock);
1739 return -EADDRNOTAVAIL;
1740 }
1741
1742
1743 int addrconf_add_ifaddr(void __user *arg)
1744 {
1745 struct in6_ifreq ireq;
1746 int err;
1747
1748 if (!capable(CAP_NET_ADMIN))
1749 return -EPERM;
1750
1751 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1752 return -EFAULT;
1753
1754 rtnl_lock();
1755 err = inet6_addr_add(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
1756 rtnl_unlock();
1757 return err;
1758 }
1759
1760 int addrconf_del_ifaddr(void __user *arg)
1761 {
1762 struct in6_ifreq ireq;
1763 int err;
1764
1765 if (!capable(CAP_NET_ADMIN))
1766 return -EPERM;
1767
1768 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1769 return -EFAULT;
1770
1771 rtnl_lock();
1772 err = inet6_addr_del(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
1773 rtnl_unlock();
1774 return err;
1775 }
1776
1777 static void sit_add_v4_addrs(struct inet6_dev *idev)
1778 {
1779 struct inet6_ifaddr * ifp;
1780 struct in6_addr addr;
1781 struct net_device *dev;
1782 int scope;
1783
1784 ASSERT_RTNL();
1785
1786 memset(&addr, 0, sizeof(struct in6_addr));
1787 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
1788
1789 if (idev->dev->flags&IFF_POINTOPOINT) {
1790 addr.s6_addr32[0] = htonl(0xfe800000);
1791 scope = IFA_LINK;
1792 } else {
1793 scope = IPV6_ADDR_COMPATv4;
1794 }
1795
1796 if (addr.s6_addr32[3]) {
1797 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
1798 if (!IS_ERR(ifp)) {
1799 spin_lock_bh(&ifp->lock);
1800 ifp->flags &= ~IFA_F_TENTATIVE;
1801 spin_unlock_bh(&ifp->lock);
1802 ipv6_ifa_notify(RTM_NEWADDR, ifp);
1803 in6_ifa_put(ifp);
1804 }
1805 return;
1806 }
1807
1808 for (dev = dev_base; dev != NULL; dev = dev->next) {
1809 struct in_device * in_dev = __in_dev_get(dev);
1810 if (in_dev && (dev->flags & IFF_UP)) {
1811 struct in_ifaddr * ifa;
1812
1813 int flag = scope;
1814
1815 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1816 int plen;
1817
1818 addr.s6_addr32[3] = ifa->ifa_local;
1819
1820 if (ifa->ifa_scope == RT_SCOPE_LINK)
1821 continue;
1822 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
1823 if (idev->dev->flags&IFF_POINTOPOINT)
1824 continue;
1825 flag |= IFA_HOST;
1826 }
1827 if (idev->dev->flags&IFF_POINTOPOINT)
1828 plen = 64;
1829 else
1830 plen = 96;
1831
1832 ifp = ipv6_add_addr(idev, &addr, plen, flag,
1833 IFA_F_PERMANENT);
1834 if (!IS_ERR(ifp)) {
1835 spin_lock_bh(&ifp->lock);
1836 ifp->flags &= ~IFA_F_TENTATIVE;
1837 spin_unlock_bh(&ifp->lock);
1838 ipv6_ifa_notify(RTM_NEWADDR, ifp);
1839 in6_ifa_put(ifp);
1840 }
1841 }
1842 }
1843 }
1844 }
1845
1846 static void init_loopback(struct net_device *dev)
1847 {
1848 struct inet6_dev *idev;
1849 struct inet6_ifaddr * ifp;
1850
1851 /* ::1 */
1852
1853 ASSERT_RTNL();
1854
1855 if ((idev = ipv6_find_idev(dev)) == NULL) {
1856 printk(KERN_DEBUG "init loopback: add_dev failed\n");
1857 return;
1858 }
1859
1860 ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
1861 if (!IS_ERR(ifp)) {
1862 spin_lock_bh(&ifp->lock);
1863 ifp->flags &= ~IFA_F_TENTATIVE;
1864 spin_unlock_bh(&ifp->lock);
1865 ipv6_ifa_notify(RTM_NEWADDR, ifp);
1866 in6_ifa_put(ifp);
1867 }
1868 }
1869
1870 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
1871 {
1872 struct inet6_ifaddr * ifp;
1873
1874 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, IFA_F_PERMANENT);
1875 if (!IS_ERR(ifp)) {
1876 addrconf_dad_start(ifp, 0);
1877 in6_ifa_put(ifp);
1878 }
1879 }
1880
1881 static void addrconf_dev_config(struct net_device *dev)
1882 {
1883 struct in6_addr addr;
1884 struct inet6_dev * idev;
1885
1886 ASSERT_RTNL();
1887
1888 if ((dev->type != ARPHRD_ETHER) &&
1889 (dev->type != ARPHRD_FDDI) &&
1890 (dev->type != ARPHRD_IEEE802_TR) &&
1891 (dev->type != ARPHRD_ARCNET) &&
1892 (dev->type != ARPHRD_INFINIBAND)) {
1893 /* Alas, we support only Ethernet autoconfiguration. */
1894 return;
1895 }
1896
1897 idev = addrconf_add_dev(dev);
1898 if (idev == NULL)
1899 return;
1900
1901 memset(&addr, 0, sizeof(struct in6_addr));
1902 addr.s6_addr32[0] = htonl(0xFE800000);
1903
1904 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
1905 addrconf_add_linklocal(idev, &addr);
1906 }
1907
1908 static void addrconf_sit_config(struct net_device *dev)
1909 {
1910 struct inet6_dev *idev;
1911
1912 ASSERT_RTNL();
1913
1914 /*
1915 * Configure the tunnel with one of our IPv4
1916 * addresses... we should configure all of
1917 * our v4 addrs in the tunnel
1918 */
1919
1920 if ((idev = ipv6_find_idev(dev)) == NULL) {
1921 printk(KERN_DEBUG "init sit: add_dev failed\n");
1922 return;
1923 }
1924
1925 sit_add_v4_addrs(idev);
1926
1927 if (dev->flags&IFF_POINTOPOINT) {
1928 addrconf_add_mroute(dev);
1929 addrconf_add_lroute(dev);
1930 } else
1931 sit_route_add(dev);
1932 }
1933
1934 static inline int
1935 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
1936 {
1937 struct in6_addr lladdr;
1938
1939 if (!ipv6_get_lladdr(link_dev, &lladdr)) {
1940 addrconf_add_linklocal(idev, &lladdr);
1941 return 0;
1942 }
1943 return -1;
1944 }
1945
1946 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
1947 {
1948 struct net_device *link_dev;
1949
1950 /* first try to inherit the link-local address from the link device */
1951 if (idev->dev->iflink &&
1952 (link_dev = __dev_get_by_index(idev->dev->iflink))) {
1953 if (!ipv6_inherit_linklocal(idev, link_dev))
1954 return;
1955 }
1956 /* then try to inherit it from any device */
1957 for (link_dev = dev_base; link_dev; link_dev = link_dev->next) {
1958 if (!ipv6_inherit_linklocal(idev, link_dev))
1959 return;
1960 }
1961 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
1962 }
1963
1964 /*
1965 * Autoconfigure tunnel with a link-local address so routing protocols,
1966 * DHCPv6, MLD etc. can be run over the virtual link
1967 */
1968
1969 static void addrconf_ip6_tnl_config(struct net_device *dev)
1970 {
1971 struct inet6_dev *idev;
1972
1973 ASSERT_RTNL();
1974
1975 if ((idev = addrconf_add_dev(dev)) == NULL) {
1976 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
1977 return;
1978 }
1979 ip6_tnl_add_linklocal(idev);
1980 addrconf_add_mroute(dev);
1981 }
1982
1983 static int addrconf_notify(struct notifier_block *this, unsigned long event,
1984 void * data)
1985 {
1986 struct net_device *dev = (struct net_device *) data;
1987 struct inet6_dev *idev = __in6_dev_get(dev);
1988
1989 switch(event) {
1990 case NETDEV_UP:
1991 switch(dev->type) {
1992 case ARPHRD_SIT:
1993 addrconf_sit_config(dev);
1994 break;
1995 case ARPHRD_TUNNEL6:
1996 addrconf_ip6_tnl_config(dev);
1997 break;
1998 case ARPHRD_LOOPBACK:
1999 init_loopback(dev);
2000 break;
2001
2002 default:
2003 addrconf_dev_config(dev);
2004 break;
2005 };
2006 if (idev) {
2007 /* If the MTU changed during the interface down, when the
2008 interface up, the changed MTU must be reflected in the
2009 idev as well as routers.
2010 */
2011 if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2012 rt6_mtu_change(dev, dev->mtu);
2013 idev->cnf.mtu6 = dev->mtu;
2014 }
2015 idev->tstamp = jiffies;
2016 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2017 /* If the changed mtu during down is lower than IPV6_MIN_MTU
2018 stop IPv6 on this interface.
2019 */
2020 if (dev->mtu < IPV6_MIN_MTU)
2021 addrconf_ifdown(dev, event != NETDEV_DOWN);
2022 }
2023 break;
2024
2025 case NETDEV_CHANGEMTU:
2026 if ( idev && dev->mtu >= IPV6_MIN_MTU) {
2027 rt6_mtu_change(dev, dev->mtu);
2028 idev->cnf.mtu6 = dev->mtu;
2029 break;
2030 }
2031
2032 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2033
2034 case NETDEV_DOWN:
2035 case NETDEV_UNREGISTER:
2036 /*
2037 * Remove all addresses from this interface.
2038 */
2039 addrconf_ifdown(dev, event != NETDEV_DOWN);
2040 break;
2041 case NETDEV_CHANGE:
2042 break;
2043 case NETDEV_CHANGENAME:
2044 #ifdef CONFIG_SYSCTL
2045 if (idev) {
2046 addrconf_sysctl_unregister(&idev->cnf);
2047 neigh_sysctl_unregister(idev->nd_parms);
2048 neigh_sysctl_register(dev, idev->nd_parms,
2049 NET_IPV6, NET_IPV6_NEIGH, "ipv6",
2050 &ndisc_ifinfo_sysctl_change,
2051 NULL);
2052 addrconf_sysctl_register(idev, &idev->cnf);
2053 }
2054 #endif
2055 break;
2056 };
2057
2058 return NOTIFY_OK;
2059 }
2060
2061 /*
2062 * addrconf module should be notified of a device going up
2063 */
2064 static struct notifier_block ipv6_dev_notf = {
2065 .notifier_call = addrconf_notify,
2066 .priority = 0
2067 };
2068
2069 static int addrconf_ifdown(struct net_device *dev, int how)
2070 {
2071 struct inet6_dev *idev;
2072 struct inet6_ifaddr *ifa, **bifa;
2073 int i;
2074
2075 ASSERT_RTNL();
2076
2077 if (dev == &loopback_dev && how == 1)
2078 how = 0;
2079
2080 rt6_ifdown(dev);
2081 neigh_ifdown(&nd_tbl, dev);
2082
2083 idev = __in6_dev_get(dev);
2084 if (idev == NULL)
2085 return -ENODEV;
2086
2087 /* Step 1: remove reference to ipv6 device from parent device.
2088 Do not dev_put!
2089 */
2090 if (how == 1) {
2091 write_lock_bh(&addrconf_lock);
2092 dev->ip6_ptr = NULL;
2093 idev->dead = 1;
2094 write_unlock_bh(&addrconf_lock);
2095
2096 /* Step 1.5: remove snmp6 entry */
2097 snmp6_unregister_dev(idev);
2098
2099 }
2100
2101 /* Step 2: clear hash table */
2102 for (i=0; i<IN6_ADDR_HSIZE; i++) {
2103 bifa = &inet6_addr_lst[i];
2104
2105 write_lock_bh(&addrconf_hash_lock);
2106 while ((ifa = *bifa) != NULL) {
2107 if (ifa->idev == idev) {
2108 *bifa = ifa->lst_next;
2109 ifa->lst_next = NULL;
2110 addrconf_del_timer(ifa);
2111 in6_ifa_put(ifa);
2112 continue;
2113 }
2114 bifa = &ifa->lst_next;
2115 }
2116 write_unlock_bh(&addrconf_hash_lock);
2117 }
2118
2119 write_lock_bh(&idev->lock);
2120
2121 /* Step 3: clear flags for stateless addrconf */
2122 if (how != 1)
2123 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD);
2124
2125 /* Step 4: clear address list */
2126 #ifdef CONFIG_IPV6_PRIVACY
2127 if (how == 1 && del_timer(&idev->regen_timer))
2128 in6_dev_put(idev);
2129
2130 /* clear tempaddr list */
2131 while ((ifa = idev->tempaddr_list) != NULL) {
2132 idev->tempaddr_list = ifa->tmp_next;
2133 ifa->tmp_next = NULL;
2134 ifa->dead = 1;
2135 write_unlock_bh(&idev->lock);
2136 spin_lock_bh(&ifa->lock);
2137
2138 if (ifa->ifpub) {
2139 in6_ifa_put(ifa->ifpub);
2140 ifa->ifpub = NULL;
2141 }
2142 spin_unlock_bh(&ifa->lock);
2143 in6_ifa_put(ifa);
2144 write_lock_bh(&idev->lock);
2145 }
2146 #endif
2147 while ((ifa = idev->addr_list) != NULL) {
2148 idev->addr_list = ifa->if_next;
2149 ifa->if_next = NULL;
2150 ifa->dead = 1;
2151 addrconf_del_timer(ifa);
2152 write_unlock_bh(&idev->lock);
2153
2154 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2155 in6_ifa_put(ifa);
2156
2157 write_lock_bh(&idev->lock);
2158 }
2159 write_unlock_bh(&idev->lock);
2160
2161 /* Step 5: Discard multicast list */
2162
2163 if (how == 1)
2164 ipv6_mc_destroy_dev(idev);
2165 else
2166 ipv6_mc_down(idev);
2167
2168 /* Step 5: netlink notification of this interface */
2169 idev->tstamp = jiffies;
2170 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2171
2172 /* Shot the device (if unregistered) */
2173
2174 if (how == 1) {
2175 #ifdef CONFIG_SYSCTL
2176 addrconf_sysctl_unregister(&idev->cnf);
2177 neigh_sysctl_unregister(idev->nd_parms);
2178 #endif
2179 neigh_parms_release(&nd_tbl, idev->nd_parms);
2180 neigh_ifdown(&nd_tbl, dev);
2181 in6_dev_put(idev);
2182 }
2183 return 0;
2184 }
2185
2186 static void addrconf_rs_timer(unsigned long data)
2187 {
2188 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2189
2190 if (ifp->idev->cnf.forwarding)
2191 goto out;
2192
2193 if (ifp->idev->if_flags & IF_RA_RCVD) {
2194 /*
2195 * Announcement received after solicitation
2196 * was sent
2197 */
2198 goto out;
2199 }
2200
2201 spin_lock(&ifp->lock);
2202 if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2203 struct in6_addr all_routers;
2204
2205 /* The wait after the last probe can be shorter */
2206 addrconf_mod_timer(ifp, AC_RS,
2207 (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2208 ifp->idev->cnf.rtr_solicit_delay :
2209 ifp->idev->cnf.rtr_solicit_interval);
2210 spin_unlock(&ifp->lock);
2211
2212 ipv6_addr_all_routers(&all_routers);
2213
2214 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2215 } else {
2216 spin_unlock(&ifp->lock);
2217 /*
2218 * Note: we do not support deprecated "all on-link"
2219 * assumption any longer.
2220 */
2221 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2222 ifp->idev->dev->name);
2223 }
2224
2225 out:
2226 in6_ifa_put(ifp);
2227 }
2228
2229 /*
2230 * Duplicate Address Detection
2231 */
2232 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2233 {
2234 struct inet6_dev *idev = ifp->idev;
2235 struct net_device *dev = idev->dev;
2236 unsigned long rand_num;
2237
2238 addrconf_join_solict(dev, &ifp->addr);
2239
2240 if (ifp->prefix_len != 128 && (ifp->flags&IFA_F_PERMANENT))
2241 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 0,
2242 flags);
2243
2244 net_srandom(ifp->addr.s6_addr32[3]);
2245 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2246
2247 read_lock_bh(&idev->lock);
2248 if (ifp->dead)
2249 goto out;
2250 spin_lock_bh(&ifp->lock);
2251
2252 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2253 !(ifp->flags&IFA_F_TENTATIVE)) {
2254 ifp->flags &= ~IFA_F_TENTATIVE;
2255 spin_unlock_bh(&ifp->lock);
2256 read_unlock_bh(&idev->lock);
2257
2258 addrconf_dad_completed(ifp);
2259 return;
2260 }
2261
2262 ifp->probes = idev->cnf.dad_transmits;
2263 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2264
2265 spin_unlock_bh(&ifp->lock);
2266 out:
2267 read_unlock_bh(&idev->lock);
2268 }
2269
2270 static void addrconf_dad_timer(unsigned long data)
2271 {
2272 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2273 struct inet6_dev *idev = ifp->idev;
2274 struct in6_addr unspec;
2275 struct in6_addr mcaddr;
2276
2277 read_lock_bh(&idev->lock);
2278 if (idev->dead) {
2279 read_unlock_bh(&idev->lock);
2280 goto out;
2281 }
2282 spin_lock_bh(&ifp->lock);
2283 if (ifp->probes == 0) {
2284 /*
2285 * DAD was successful
2286 */
2287
2288 ifp->flags &= ~IFA_F_TENTATIVE;
2289 spin_unlock_bh(&ifp->lock);
2290 read_unlock_bh(&idev->lock);
2291
2292 addrconf_dad_completed(ifp);
2293
2294 goto out;
2295 }
2296
2297 ifp->probes--;
2298 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2299 spin_unlock_bh(&ifp->lock);
2300 read_unlock_bh(&idev->lock);
2301
2302 /* send a neighbour solicitation for our addr */
2303 memset(&unspec, 0, sizeof(unspec));
2304 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2305 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec);
2306 out:
2307 in6_ifa_put(ifp);
2308 }
2309
2310 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2311 {
2312 struct net_device * dev = ifp->idev->dev;
2313
2314 /*
2315 * Configure the address for reception. Now it is valid.
2316 */
2317
2318 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2319
2320 /* If added prefix is link local and forwarding is off,
2321 start sending router solicitations.
2322 */
2323
2324 if (ifp->idev->cnf.forwarding == 0 &&
2325 ifp->idev->cnf.rtr_solicits > 0 &&
2326 (dev->flags&IFF_LOOPBACK) == 0 &&
2327 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2328 struct in6_addr all_routers;
2329
2330 ipv6_addr_all_routers(&all_routers);
2331
2332 /*
2333 * If a host as already performed a random delay
2334 * [...] as part of DAD [...] there is no need
2335 * to delay again before sending the first RS
2336 */
2337 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2338
2339 spin_lock_bh(&ifp->lock);
2340 ifp->probes = 1;
2341 ifp->idev->if_flags |= IF_RS_SENT;
2342 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2343 spin_unlock_bh(&ifp->lock);
2344 }
2345 }
2346
2347 #ifdef CONFIG_PROC_FS
2348 struct if6_iter_state {
2349 int bucket;
2350 };
2351
2352 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2353 {
2354 struct inet6_ifaddr *ifa = NULL;
2355 struct if6_iter_state *state = seq->private;
2356
2357 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2358 ifa = inet6_addr_lst[state->bucket];
2359 if (ifa)
2360 break;
2361 }
2362 return ifa;
2363 }
2364
2365 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2366 {
2367 struct if6_iter_state *state = seq->private;
2368
2369 ifa = ifa->lst_next;
2370 try_again:
2371 if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2372 ifa = inet6_addr_lst[state->bucket];
2373 goto try_again;
2374 }
2375 return ifa;
2376 }
2377
2378 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2379 {
2380 struct inet6_ifaddr *ifa = if6_get_first(seq);
2381
2382 if (ifa)
2383 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2384 --pos;
2385 return pos ? NULL : ifa;
2386 }
2387
2388 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2389 {
2390 read_lock_bh(&addrconf_hash_lock);
2391 return if6_get_idx(seq, *pos);
2392 }
2393
2394 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2395 {
2396 struct inet6_ifaddr *ifa;
2397
2398 ifa = if6_get_next(seq, v);
2399 ++*pos;
2400 return ifa;
2401 }
2402
2403 static void if6_seq_stop(struct seq_file *seq, void *v)
2404 {
2405 read_unlock_bh(&addrconf_hash_lock);
2406 }
2407
2408 static int if6_seq_show(struct seq_file *seq, void *v)
2409 {
2410 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2411 seq_printf(seq,
2412 "%04x%04x%04x%04x%04x%04x%04x%04x %02x %02x %02x %02x %8s\n",
2413 NIP6(ifp->addr),
2414 ifp->idev->dev->ifindex,
2415 ifp->prefix_len,
2416 ifp->scope,
2417 ifp->flags,
2418 ifp->idev->dev->name);
2419 return 0;
2420 }
2421
2422 static struct seq_operations if6_seq_ops = {
2423 .start = if6_seq_start,
2424 .next = if6_seq_next,
2425 .show = if6_seq_show,
2426 .stop = if6_seq_stop,
2427 };
2428
2429 static int if6_seq_open(struct inode *inode, struct file *file)
2430 {
2431 struct seq_file *seq;
2432 int rc = -ENOMEM;
2433 struct if6_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL);
2434
2435 if (!s)
2436 goto out;
2437 memset(s, 0, sizeof(*s));
2438
2439 rc = seq_open(file, &if6_seq_ops);
2440 if (rc)
2441 goto out_kfree;
2442
2443 seq = file->private_data;
2444 seq->private = s;
2445 out:
2446 return rc;
2447 out_kfree:
2448 kfree(s);
2449 goto out;
2450 }
2451
2452 static struct file_operations if6_fops = {
2453 .owner = THIS_MODULE,
2454 .open = if6_seq_open,
2455 .read = seq_read,
2456 .llseek = seq_lseek,
2457 .release = seq_release_private,
2458 };
2459
2460 int __init if6_proc_init(void)
2461 {
2462 if (!proc_net_fops_create("if_inet6", S_IRUGO, &if6_fops))
2463 return -ENOMEM;
2464 return 0;
2465 }
2466
2467 void if6_proc_exit(void)
2468 {
2469 proc_net_remove("if_inet6");
2470 }
2471 #endif /* CONFIG_PROC_FS */
2472
2473 /*
2474 * Periodic address status verification
2475 */
2476
2477 static void addrconf_verify(unsigned long foo)
2478 {
2479 struct inet6_ifaddr *ifp;
2480 unsigned long now, next;
2481 int i;
2482
2483 spin_lock_bh(&addrconf_verify_lock);
2484 now = jiffies;
2485 next = now + ADDR_CHECK_FREQUENCY;
2486
2487 del_timer(&addr_chk_timer);
2488
2489 for (i=0; i < IN6_ADDR_HSIZE; i++) {
2490
2491 restart:
2492 write_lock(&addrconf_hash_lock);
2493 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
2494 unsigned long age;
2495 #ifdef CONFIG_IPV6_PRIVACY
2496 unsigned long regen_advance;
2497 #endif
2498
2499 if (ifp->flags & IFA_F_PERMANENT)
2500 continue;
2501
2502 spin_lock(&ifp->lock);
2503 age = (now - ifp->tstamp) / HZ;
2504
2505 #ifdef CONFIG_IPV6_PRIVACY
2506 regen_advance = ifp->idev->cnf.regen_max_retry *
2507 ifp->idev->cnf.dad_transmits *
2508 ifp->idev->nd_parms->retrans_time / HZ;
2509 #endif
2510
2511 if (age >= ifp->valid_lft) {
2512 spin_unlock(&ifp->lock);
2513 in6_ifa_hold(ifp);
2514 write_unlock(&addrconf_hash_lock);
2515 ipv6_del_addr(ifp);
2516 goto restart;
2517 } else if (age >= ifp->prefered_lft) {
2518 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
2519 int deprecate = 0;
2520
2521 if (!(ifp->flags&IFA_F_DEPRECATED)) {
2522 deprecate = 1;
2523 ifp->flags |= IFA_F_DEPRECATED;
2524 }
2525
2526 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
2527 next = ifp->tstamp + ifp->valid_lft * HZ;
2528
2529 spin_unlock(&ifp->lock);
2530
2531 if (deprecate) {
2532 in6_ifa_hold(ifp);
2533 write_unlock(&addrconf_hash_lock);
2534
2535 ipv6_ifa_notify(0, ifp);
2536 in6_ifa_put(ifp);
2537 goto restart;
2538 }
2539 #ifdef CONFIG_IPV6_PRIVACY
2540 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
2541 !(ifp->flags&IFA_F_TENTATIVE)) {
2542 if (age >= ifp->prefered_lft - regen_advance) {
2543 struct inet6_ifaddr *ifpub = ifp->ifpub;
2544 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2545 next = ifp->tstamp + ifp->prefered_lft * HZ;
2546 if (!ifp->regen_count && ifpub) {
2547 ifp->regen_count++;
2548 in6_ifa_hold(ifp);
2549 in6_ifa_hold(ifpub);
2550 spin_unlock(&ifp->lock);
2551 write_unlock(&addrconf_hash_lock);
2552 ipv6_create_tempaddr(ifpub, ifp);
2553 in6_ifa_put(ifpub);
2554 in6_ifa_put(ifp);
2555 goto restart;
2556 }
2557 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
2558 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
2559 spin_unlock(&ifp->lock);
2560 #endif
2561 } else {
2562 /* ifp->prefered_lft <= ifp->valid_lft */
2563 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2564 next = ifp->tstamp + ifp->prefered_lft * HZ;
2565 spin_unlock(&ifp->lock);
2566 }
2567 }
2568 write_unlock(&addrconf_hash_lock);
2569 }
2570
2571 addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
2572 add_timer(&addr_chk_timer);
2573 spin_unlock_bh(&addrconf_verify_lock);
2574 }
2575
2576 static int
2577 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
2578 {
2579 struct rtattr **rta = arg;
2580 struct ifaddrmsg *ifm = NLMSG_DATA(nlh);
2581 struct in6_addr *pfx;
2582
2583 pfx = NULL;
2584 if (rta[IFA_ADDRESS-1]) {
2585 if (RTA_PAYLOAD(rta[IFA_ADDRESS-1]) < sizeof(*pfx))
2586 return -EINVAL;
2587 pfx = RTA_DATA(rta[IFA_ADDRESS-1]);
2588 }
2589 if (rta[IFA_LOCAL-1]) {
2590 if (pfx && memcmp(pfx, RTA_DATA(rta[IFA_LOCAL-1]), sizeof(*pfx)))
2591 return -EINVAL;
2592 pfx = RTA_DATA(rta[IFA_LOCAL-1]);
2593 }
2594 if (pfx == NULL)
2595 return -EINVAL;
2596
2597 return inet6_addr_del(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
2598 }
2599
2600 static int
2601 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
2602 {
2603 struct rtattr **rta = arg;
2604 struct ifaddrmsg *ifm = NLMSG_DATA(nlh);
2605 struct in6_addr *pfx;
2606
2607 pfx = NULL;
2608 if (rta[IFA_ADDRESS-1]) {
2609 if (RTA_PAYLOAD(rta[IFA_ADDRESS-1]) < sizeof(*pfx))
2610 return -EINVAL;
2611 pfx = RTA_DATA(rta[IFA_ADDRESS-1]);
2612 }
2613 if (rta[IFA_LOCAL-1]) {
2614 if (pfx && memcmp(pfx, RTA_DATA(rta[IFA_LOCAL-1]), sizeof(*pfx)))
2615 return -EINVAL;
2616 pfx = RTA_DATA(rta[IFA_LOCAL-1]);
2617 }
2618 if (pfx == NULL)
2619 return -EINVAL;
2620
2621 return inet6_addr_add(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
2622 }
2623
2624 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
2625 u32 pid, u32 seq, int event, unsigned int flags)
2626 {
2627 struct ifaddrmsg *ifm;
2628 struct nlmsghdr *nlh;
2629 struct ifa_cacheinfo ci;
2630 unsigned char *b = skb->tail;
2631
2632 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags);
2633 ifm = NLMSG_DATA(nlh);
2634 ifm->ifa_family = AF_INET6;
2635 ifm->ifa_prefixlen = ifa->prefix_len;
2636 ifm->ifa_flags = ifa->flags;
2637 ifm->ifa_scope = RT_SCOPE_UNIVERSE;
2638 if (ifa->scope&IFA_HOST)
2639 ifm->ifa_scope = RT_SCOPE_HOST;
2640 else if (ifa->scope&IFA_LINK)
2641 ifm->ifa_scope = RT_SCOPE_LINK;
2642 else if (ifa->scope&IFA_SITE)
2643 ifm->ifa_scope = RT_SCOPE_SITE;
2644 ifm->ifa_index = ifa->idev->dev->ifindex;
2645 RTA_PUT(skb, IFA_ADDRESS, 16, &ifa->addr);
2646 if (!(ifa->flags&IFA_F_PERMANENT)) {
2647 ci.ifa_prefered = ifa->prefered_lft;
2648 ci.ifa_valid = ifa->valid_lft;
2649 if (ci.ifa_prefered != INFINITY_LIFE_TIME) {
2650 long tval = (jiffies - ifa->tstamp)/HZ;
2651 ci.ifa_prefered -= tval;
2652 if (ci.ifa_valid != INFINITY_LIFE_TIME)
2653 ci.ifa_valid -= tval;
2654 }
2655 } else {
2656 ci.ifa_prefered = INFINITY_LIFE_TIME;
2657 ci.ifa_valid = INFINITY_LIFE_TIME;
2658 }
2659 ci.cstamp = (__u32)(TIME_DELTA(ifa->cstamp, INITIAL_JIFFIES) / HZ * 100
2660 + TIME_DELTA(ifa->cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
2661 ci.tstamp = (__u32)(TIME_DELTA(ifa->tstamp, INITIAL_JIFFIES) / HZ * 100
2662 + TIME_DELTA(ifa->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
2663 RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci);
2664 nlh->nlmsg_len = skb->tail - b;
2665 return skb->len;
2666
2667 nlmsg_failure:
2668 rtattr_failure:
2669 skb_trim(skb, b - skb->data);
2670 return -1;
2671 }
2672
2673 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
2674 u32 pid, u32 seq, int event, u16 flags)
2675 {
2676 struct ifaddrmsg *ifm;
2677 struct nlmsghdr *nlh;
2678 struct ifa_cacheinfo ci;
2679 unsigned char *b = skb->tail;
2680
2681 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags);
2682 ifm = NLMSG_DATA(nlh);
2683 ifm->ifa_family = AF_INET6;
2684 ifm->ifa_prefixlen = 128;
2685 ifm->ifa_flags = IFA_F_PERMANENT;
2686 ifm->ifa_scope = RT_SCOPE_UNIVERSE;
2687 if (ipv6_addr_scope(&ifmca->mca_addr)&IFA_SITE)
2688 ifm->ifa_scope = RT_SCOPE_SITE;
2689 ifm->ifa_index = ifmca->idev->dev->ifindex;
2690 RTA_PUT(skb, IFA_MULTICAST, 16, &ifmca->mca_addr);
2691 ci.cstamp = (__u32)(TIME_DELTA(ifmca->mca_cstamp, INITIAL_JIFFIES) / HZ
2692 * 100 + TIME_DELTA(ifmca->mca_cstamp, INITIAL_JIFFIES) % HZ
2693 * 100 / HZ);
2694 ci.tstamp = (__u32)(TIME_DELTA(ifmca->mca_tstamp, INITIAL_JIFFIES) / HZ
2695 * 100 + TIME_DELTA(ifmca->mca_tstamp, INITIAL_JIFFIES) % HZ
2696 * 100 / HZ);
2697 ci.ifa_prefered = INFINITY_LIFE_TIME;
2698 ci.ifa_valid = INFINITY_LIFE_TIME;
2699 RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci);
2700 nlh->nlmsg_len = skb->tail - b;
2701 return skb->len;
2702
2703 nlmsg_failure:
2704 rtattr_failure:
2705 skb_trim(skb, b - skb->data);
2706 return -1;
2707 }
2708
2709 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
2710 u32 pid, u32 seq, int event, unsigned int flags)
2711 {
2712 struct ifaddrmsg *ifm;
2713 struct nlmsghdr *nlh;
2714 struct ifa_cacheinfo ci;
2715 unsigned char *b = skb->tail;
2716
2717 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags);
2718 ifm = NLMSG_DATA(nlh);
2719 ifm->ifa_family = AF_INET6;
2720 ifm->ifa_prefixlen = 128;
2721 ifm->ifa_flags = IFA_F_PERMANENT;
2722 ifm->ifa_scope = RT_SCOPE_UNIVERSE;
2723 if (ipv6_addr_scope(&ifaca->aca_addr)&IFA_SITE)
2724 ifm->ifa_scope = RT_SCOPE_SITE;
2725 ifm->ifa_index = ifaca->aca_idev->dev->ifindex;
2726 RTA_PUT(skb, IFA_ANYCAST, 16, &ifaca->aca_addr);
2727 ci.cstamp = (__u32)(TIME_DELTA(ifaca->aca_cstamp, INITIAL_JIFFIES) / HZ
2728 * 100 + TIME_DELTA(ifaca->aca_cstamp, INITIAL_JIFFIES) % HZ
2729 * 100 / HZ);
2730 ci.tstamp = (__u32)(TIME_DELTA(ifaca->aca_tstamp, INITIAL_JIFFIES) / HZ
2731 * 100 + TIME_DELTA(ifaca->aca_tstamp, INITIAL_JIFFIES) % HZ
2732 * 100 / HZ);
2733 ci.ifa_prefered = INFINITY_LIFE_TIME;
2734 ci.ifa_valid = INFINITY_LIFE_TIME;
2735 RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci);
2736 nlh->nlmsg_len = skb->tail - b;
2737 return skb->len;
2738
2739 nlmsg_failure:
2740 rtattr_failure:
2741 skb_trim(skb, b - skb->data);
2742 return -1;
2743 }
2744
2745 enum addr_type_t
2746 {
2747 UNICAST_ADDR,
2748 MULTICAST_ADDR,
2749 ANYCAST_ADDR,
2750 };
2751
2752 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
2753 enum addr_type_t type)
2754 {
2755 int idx, ip_idx;
2756 int s_idx, s_ip_idx;
2757 int err = 1;
2758 struct net_device *dev;
2759 struct inet6_dev *idev = NULL;
2760 struct inet6_ifaddr *ifa;
2761 struct ifmcaddr6 *ifmca;
2762 struct ifacaddr6 *ifaca;
2763
2764 s_idx = cb->args[0];
2765 s_ip_idx = ip_idx = cb->args[1];
2766 read_lock(&dev_base_lock);
2767
2768 for (dev = dev_base, idx = 0; dev; dev = dev->next, idx++) {
2769 if (idx < s_idx)
2770 continue;
2771 if (idx > s_idx)
2772 s_ip_idx = 0;
2773 ip_idx = 0;
2774 if ((idev = in6_dev_get(dev)) == NULL)
2775 continue;
2776 read_lock_bh(&idev->lock);
2777 switch (type) {
2778 case UNICAST_ADDR:
2779 /* unicast address incl. temp addr */
2780 for (ifa = idev->addr_list; ifa;
2781 ifa = ifa->if_next, ip_idx++) {
2782 if (ip_idx < s_ip_idx)
2783 continue;
2784 if ((err = inet6_fill_ifaddr(skb, ifa,
2785 NETLINK_CB(cb->skb).pid,
2786 cb->nlh->nlmsg_seq, RTM_NEWADDR,
2787 NLM_F_MULTI)) <= 0)
2788 goto done;
2789 }
2790 break;
2791 case MULTICAST_ADDR:
2792 /* multicast address */
2793 for (ifmca = idev->mc_list; ifmca;
2794 ifmca = ifmca->next, ip_idx++) {
2795 if (ip_idx < s_ip_idx)
2796 continue;
2797 if ((err = inet6_fill_ifmcaddr(skb, ifmca,
2798 NETLINK_CB(cb->skb).pid,
2799 cb->nlh->nlmsg_seq, RTM_GETMULTICAST,
2800 NLM_F_MULTI)) <= 0)
2801 goto done;
2802 }
2803 break;
2804 case ANYCAST_ADDR:
2805 /* anycast address */
2806 for (ifaca = idev->ac_list; ifaca;
2807 ifaca = ifaca->aca_next, ip_idx++) {
2808 if (ip_idx < s_ip_idx)
2809 continue;
2810 if ((err = inet6_fill_ifacaddr(skb, ifaca,
2811 NETLINK_CB(cb->skb).pid,
2812 cb->nlh->nlmsg_seq, RTM_GETANYCAST,
2813 NLM_F_MULTI)) <= 0)
2814 goto done;
2815 }
2816 break;
2817 default:
2818 break;
2819 }
2820 read_unlock_bh(&idev->lock);
2821 in6_dev_put(idev);
2822 }
2823 done:
2824 if (err <= 0) {
2825 read_unlock_bh(&idev->lock);
2826 in6_dev_put(idev);
2827 }
2828 read_unlock(&dev_base_lock);
2829 cb->args[0] = idx;
2830 cb->args[1] = ip_idx;
2831 return skb->len;
2832 }
2833
2834 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
2835 {
2836 enum addr_type_t type = UNICAST_ADDR;
2837 return inet6_dump_addr(skb, cb, type);
2838 }
2839
2840 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
2841 {
2842 enum addr_type_t type = MULTICAST_ADDR;
2843 return inet6_dump_addr(skb, cb, type);
2844 }
2845
2846
2847 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
2848 {
2849 enum addr_type_t type = ANYCAST_ADDR;
2850 return inet6_dump_addr(skb, cb, type);
2851 }
2852
2853 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
2854 {
2855 struct sk_buff *skb;
2856 int size = NLMSG_SPACE(sizeof(struct ifaddrmsg)+128);
2857
2858 skb = alloc_skb(size, GFP_ATOMIC);
2859 if (!skb) {
2860 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFADDR, ENOBUFS);
2861 return;
2862 }
2863 if (inet6_fill_ifaddr(skb, ifa, current->pid, 0, event, 0) < 0) {
2864 kfree_skb(skb);
2865 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFADDR, EINVAL);
2866 return;
2867 }
2868 NETLINK_CB(skb).dst_group = RTNLGRP_IPV6_IFADDR;
2869 netlink_broadcast(rtnl, skb, 0, RTNLGRP_IPV6_IFADDR, GFP_ATOMIC);
2870 }
2871
2872 static void inline ipv6_store_devconf(struct ipv6_devconf *cnf,
2873 __s32 *array, int bytes)
2874 {
2875 memset(array, 0, bytes);
2876 array[DEVCONF_FORWARDING] = cnf->forwarding;
2877 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
2878 array[DEVCONF_MTU6] = cnf->mtu6;
2879 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
2880 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
2881 array[DEVCONF_AUTOCONF] = cnf->autoconf;
2882 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
2883 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
2884 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
2885 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
2886 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
2887 #ifdef CONFIG_IPV6_PRIVACY
2888 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
2889 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
2890 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
2891 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
2892 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
2893 #endif
2894 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
2895 }
2896
2897 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
2898 u32 pid, u32 seq, int event, unsigned int flags)
2899 {
2900 struct net_device *dev = idev->dev;
2901 __s32 *array = NULL;
2902 struct ifinfomsg *r;
2903 struct nlmsghdr *nlh;
2904 unsigned char *b = skb->tail;
2905 struct rtattr *subattr;
2906 __u32 mtu = dev->mtu;
2907 struct ifla_cacheinfo ci;
2908
2909 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*r), flags);
2910 r = NLMSG_DATA(nlh);
2911 r->ifi_family = AF_INET6;
2912 r->__ifi_pad = 0;
2913 r->ifi_type = dev->type;
2914 r->ifi_index = dev->ifindex;
2915 r->ifi_flags = dev_get_flags(dev);
2916 r->ifi_change = 0;
2917
2918 RTA_PUT(skb, IFLA_IFNAME, strlen(dev->name)+1, dev->name);
2919
2920 if (dev->addr_len)
2921 RTA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
2922
2923 RTA_PUT(skb, IFLA_MTU, sizeof(mtu), &mtu);
2924 if (dev->ifindex != dev->iflink)
2925 RTA_PUT(skb, IFLA_LINK, sizeof(int), &dev->iflink);
2926
2927 subattr = (struct rtattr*)skb->tail;
2928
2929 RTA_PUT(skb, IFLA_PROTINFO, 0, NULL);
2930
2931 /* return the device flags */
2932 RTA_PUT(skb, IFLA_INET6_FLAGS, sizeof(__u32), &idev->if_flags);
2933
2934 /* return interface cacheinfo */
2935 ci.max_reasm_len = IPV6_MAXPLEN;
2936 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
2937 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
2938 ci.reachable_time = idev->nd_parms->reachable_time;
2939 ci.retrans_time = idev->nd_parms->retrans_time;
2940 RTA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
2941
2942 /* return the device sysctl params */
2943 if ((array = kmalloc(DEVCONF_MAX * sizeof(*array), GFP_ATOMIC)) == NULL)
2944 goto rtattr_failure;
2945 ipv6_store_devconf(&idev->cnf, array, DEVCONF_MAX * sizeof(*array));
2946 RTA_PUT(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(*array), array);
2947
2948 /* XXX - Statistics/MC not implemented */
2949 subattr->rta_len = skb->tail - (u8*)subattr;
2950
2951 nlh->nlmsg_len = skb->tail - b;
2952 kfree(array);
2953 return skb->len;
2954
2955 nlmsg_failure:
2956 rtattr_failure:
2957 if (array)
2958 kfree(array);
2959 skb_trim(skb, b - skb->data);
2960 return -1;
2961 }
2962
2963 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
2964 {
2965 int idx, err;
2966 int s_idx = cb->args[0];
2967 struct net_device *dev;
2968 struct inet6_dev *idev;
2969
2970 read_lock(&dev_base_lock);
2971 for (dev=dev_base, idx=0; dev; dev = dev->next, idx++) {
2972 if (idx < s_idx)
2973 continue;
2974 if ((idev = in6_dev_get(dev)) == NULL)
2975 continue;
2976 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
2977 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
2978 in6_dev_put(idev);
2979 if (err <= 0)
2980 break;
2981 }
2982 read_unlock(&dev_base_lock);
2983 cb->args[0] = idx;
2984
2985 return skb->len;
2986 }
2987
2988 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
2989 {
2990 struct sk_buff *skb;
2991 /* 128 bytes ?? */
2992 int size = NLMSG_SPACE(sizeof(struct ifinfomsg)+128);
2993
2994 skb = alloc_skb(size, GFP_ATOMIC);
2995 if (!skb) {
2996 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFINFO, ENOBUFS);
2997 return;
2998 }
2999 if (inet6_fill_ifinfo(skb, idev, current->pid, 0, event, 0) < 0) {
3000 kfree_skb(skb);
3001 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFINFO, EINVAL);
3002 return;
3003 }
3004 NETLINK_CB(skb).dst_group = RTNLGRP_IPV6_IFINFO;
3005 netlink_broadcast(rtnl, skb, 0, RTNLGRP_IPV6_IFINFO, GFP_ATOMIC);
3006 }
3007
3008 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
3009 struct prefix_info *pinfo, u32 pid, u32 seq,
3010 int event, unsigned int flags)
3011 {
3012 struct prefixmsg *pmsg;
3013 struct nlmsghdr *nlh;
3014 unsigned char *b = skb->tail;
3015 struct prefix_cacheinfo ci;
3016
3017 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*pmsg), flags);
3018 pmsg = NLMSG_DATA(nlh);
3019 pmsg->prefix_family = AF_INET6;
3020 pmsg->prefix_pad1 = 0;
3021 pmsg->prefix_pad2 = 0;
3022 pmsg->prefix_ifindex = idev->dev->ifindex;
3023 pmsg->prefix_len = pinfo->prefix_len;
3024 pmsg->prefix_type = pinfo->type;
3025 pmsg->prefix_pad3 = 0;
3026
3027 pmsg->prefix_flags = 0;
3028 if (pinfo->onlink)
3029 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3030 if (pinfo->autoconf)
3031 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3032
3033 RTA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
3034
3035 ci.preferred_time = ntohl(pinfo->prefered);
3036 ci.valid_time = ntohl(pinfo->valid);
3037 RTA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
3038
3039 nlh->nlmsg_len = skb->tail - b;
3040 return skb->len;
3041
3042 nlmsg_failure:
3043 rtattr_failure:
3044 skb_trim(skb, b - skb->data);
3045 return -1;
3046 }
3047
3048 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
3049 struct prefix_info *pinfo)
3050 {
3051 struct sk_buff *skb;
3052 int size = NLMSG_SPACE(sizeof(struct prefixmsg)+128);
3053
3054 skb = alloc_skb(size, GFP_ATOMIC);
3055 if (!skb) {
3056 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_PREFIX, ENOBUFS);
3057 return;
3058 }
3059 if (inet6_fill_prefix(skb, idev, pinfo, current->pid, 0, event, 0) < 0) {
3060 kfree_skb(skb);
3061 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_PREFIX, EINVAL);
3062 return;
3063 }
3064 NETLINK_CB(skb).dst_group = RTNLGRP_IPV6_PREFIX;
3065 netlink_broadcast(rtnl, skb, 0, RTNLGRP_IPV6_PREFIX, GFP_ATOMIC);
3066 }
3067
3068 static struct rtnetlink_link inet6_rtnetlink_table[RTM_NR_MSGTYPES] = {
3069 [RTM_GETLINK - RTM_BASE] = { .dumpit = inet6_dump_ifinfo, },
3070 [RTM_NEWADDR - RTM_BASE] = { .doit = inet6_rtm_newaddr, },
3071 [RTM_DELADDR - RTM_BASE] = { .doit = inet6_rtm_deladdr, },
3072 [RTM_GETADDR - RTM_BASE] = { .dumpit = inet6_dump_ifaddr, },
3073 [RTM_GETMULTICAST - RTM_BASE] = { .dumpit = inet6_dump_ifmcaddr, },
3074 [RTM_GETANYCAST - RTM_BASE] = { .dumpit = inet6_dump_ifacaddr, },
3075 [RTM_NEWROUTE - RTM_BASE] = { .doit = inet6_rtm_newroute, },
3076 [RTM_DELROUTE - RTM_BASE] = { .doit = inet6_rtm_delroute, },
3077 [RTM_GETROUTE - RTM_BASE] = { .doit = inet6_rtm_getroute,
3078 .dumpit = inet6_dump_fib, },
3079 };
3080
3081 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3082 {
3083 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3084
3085 switch (event) {
3086 case RTM_NEWADDR:
3087 dst_hold(&ifp->rt->u.dst);
3088 if (ip6_ins_rt(ifp->rt, NULL, NULL, NULL))
3089 dst_release(&ifp->rt->u.dst);
3090 if (ifp->idev->cnf.forwarding)
3091 addrconf_join_anycast(ifp);
3092 break;
3093 case RTM_DELADDR:
3094 if (ifp->idev->cnf.forwarding)
3095 addrconf_leave_anycast(ifp);
3096 addrconf_leave_solict(ifp->idev, &ifp->addr);
3097 dst_hold(&ifp->rt->u.dst);
3098 if (ip6_del_rt(ifp->rt, NULL, NULL, NULL))
3099 dst_free(&ifp->rt->u.dst);
3100 else
3101 dst_release(&ifp->rt->u.dst);
3102 break;
3103 }
3104 }
3105
3106 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3107 {
3108 read_lock_bh(&addrconf_lock);
3109 if (likely(ifp->idev->dead == 0))
3110 __ipv6_ifa_notify(event, ifp);
3111 read_unlock_bh(&addrconf_lock);
3112 }
3113
3114 #ifdef CONFIG_SYSCTL
3115
3116 static
3117 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3118 void __user *buffer, size_t *lenp, loff_t *ppos)
3119 {
3120 int *valp = ctl->data;
3121 int val = *valp;
3122 int ret;
3123
3124 ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3125
3126 if (write && valp != &ipv6_devconf_dflt.forwarding) {
3127 if (valp != &ipv6_devconf.forwarding) {
3128 if ((!*valp) ^ (!val)) {
3129 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
3130 if (idev == NULL)
3131 return ret;
3132 dev_forward_change(idev);
3133 }
3134 } else {
3135 ipv6_devconf_dflt.forwarding = ipv6_devconf.forwarding;
3136 addrconf_forward_change();
3137 }
3138 if (*valp)
3139 rt6_purge_dflt_routers();
3140 }
3141
3142 return ret;
3143 }
3144
3145 static int addrconf_sysctl_forward_strategy(ctl_table *table,
3146 int __user *name, int nlen,
3147 void __user *oldval,
3148 size_t __user *oldlenp,
3149 void __user *newval, size_t newlen,
3150 void **context)
3151 {
3152 int *valp = table->data;
3153 int new;
3154
3155 if (!newval || !newlen)
3156 return 0;
3157 if (newlen != sizeof(int))
3158 return -EINVAL;
3159 if (get_user(new, (int __user *)newval))
3160 return -EFAULT;
3161 if (new == *valp)
3162 return 0;
3163 if (oldval && oldlenp) {
3164 size_t len;
3165 if (get_user(len, oldlenp))
3166 return -EFAULT;
3167 if (len) {
3168 if (len > table->maxlen)
3169 len = table->maxlen;
3170 if (copy_to_user(oldval, valp, len))
3171 return -EFAULT;
3172 if (put_user(len, oldlenp))
3173 return -EFAULT;
3174 }
3175 }
3176
3177 if (valp != &ipv6_devconf_dflt.forwarding) {
3178 if (valp != &ipv6_devconf.forwarding) {
3179 struct inet6_dev *idev = (struct inet6_dev *)table->extra1;
3180 int changed;
3181 if (unlikely(idev == NULL))
3182 return -ENODEV;
3183 changed = (!*valp) ^ (!new);
3184 *valp = new;
3185 if (changed)
3186 dev_forward_change(idev);
3187 } else {
3188 *valp = new;
3189 addrconf_forward_change();
3190 }
3191
3192 if (*valp)
3193 rt6_purge_dflt_routers();
3194 } else
3195 *valp = new;
3196
3197 return 1;
3198 }
3199
3200 static struct addrconf_sysctl_table
3201 {
3202 struct ctl_table_header *sysctl_header;
3203 ctl_table addrconf_vars[__NET_IPV6_MAX];
3204 ctl_table addrconf_dev[2];
3205 ctl_table addrconf_conf_dir[2];
3206 ctl_table addrconf_proto_dir[2];
3207 ctl_table addrconf_root_dir[2];
3208 } addrconf_sysctl = {
3209 .sysctl_header = NULL,
3210 .addrconf_vars = {
3211 {
3212 .ctl_name = NET_IPV6_FORWARDING,
3213 .procname = "forwarding",
3214 .data = &ipv6_devconf.forwarding,
3215 .maxlen = sizeof(int),
3216 .mode = 0644,
3217 .proc_handler = &addrconf_sysctl_forward,
3218 .strategy = &addrconf_sysctl_forward_strategy,
3219 },
3220 {
3221 .ctl_name = NET_IPV6_HOP_LIMIT,
3222 .procname = "hop_limit",
3223 .data = &ipv6_devconf.hop_limit,
3224 .maxlen = sizeof(int),
3225 .mode = 0644,
3226 .proc_handler = proc_dointvec,
3227 },
3228 {
3229 .ctl_name = NET_IPV6_MTU,
3230 .procname = "mtu",
3231 .data = &ipv6_devconf.mtu6,
3232 .maxlen = sizeof(int),
3233 .mode = 0644,
3234 .proc_handler = &proc_dointvec,
3235 },
3236 {
3237 .ctl_name = NET_IPV6_ACCEPT_RA,
3238 .procname = "accept_ra",
3239 .data = &ipv6_devconf.accept_ra,
3240 .maxlen = sizeof(int),
3241 .mode = 0644,
3242 .proc_handler = &proc_dointvec,
3243 },
3244 {
3245 .ctl_name = NET_IPV6_ACCEPT_REDIRECTS,
3246 .procname = "accept_redirects",
3247 .data = &ipv6_devconf.accept_redirects,
3248 .maxlen = sizeof(int),
3249 .mode = 0644,
3250 .proc_handler = &proc_dointvec,
3251 },
3252 {
3253 .ctl_name = NET_IPV6_AUTOCONF,
3254 .procname = "autoconf",
3255 .data = &ipv6_devconf.autoconf,
3256 .maxlen = sizeof(int),
3257 .mode = 0644,
3258 .proc_handler = &proc_dointvec,
3259 },
3260 {
3261 .ctl_name = NET_IPV6_DAD_TRANSMITS,
3262 .procname = "dad_transmits",
3263 .data = &ipv6_devconf.dad_transmits,
3264 .maxlen = sizeof(int),
3265 .mode = 0644,
3266 .proc_handler = &proc_dointvec,
3267 },
3268 {
3269 .ctl_name = NET_IPV6_RTR_SOLICITS,
3270 .procname = "router_solicitations",
3271 .data = &ipv6_devconf.rtr_solicits,
3272 .maxlen = sizeof(int),
3273 .mode = 0644,
3274 .proc_handler = &proc_dointvec,
3275 },
3276 {
3277 .ctl_name = NET_IPV6_RTR_SOLICIT_INTERVAL,
3278 .procname = "router_solicitation_interval",
3279 .data = &ipv6_devconf.rtr_solicit_interval,
3280 .maxlen = sizeof(int),
3281 .mode = 0644,
3282 .proc_handler = &proc_dointvec_jiffies,
3283 .strategy = &sysctl_jiffies,
3284 },
3285 {
3286 .ctl_name = NET_IPV6_RTR_SOLICIT_DELAY,
3287 .procname = "router_solicitation_delay",
3288 .data = &ipv6_devconf.rtr_solicit_delay,
3289 .maxlen = sizeof(int),
3290 .mode = 0644,
3291 .proc_handler = &proc_dointvec_jiffies,
3292 .strategy = &sysctl_jiffies,
3293 },
3294 {
3295 .ctl_name = NET_IPV6_FORCE_MLD_VERSION,
3296 .procname = "force_mld_version",
3297 .data = &ipv6_devconf.force_mld_version,
3298 .maxlen = sizeof(int),
3299 .mode = 0644,
3300 .proc_handler = &proc_dointvec,
3301 },
3302 #ifdef CONFIG_IPV6_PRIVACY
3303 {
3304 .ctl_name = NET_IPV6_USE_TEMPADDR,
3305 .procname = "use_tempaddr",
3306 .data = &ipv6_devconf.use_tempaddr,
3307 .maxlen = sizeof(int),
3308 .mode = 0644,
3309 .proc_handler = &proc_dointvec,
3310 },
3311 {
3312 .ctl_name = NET_IPV6_TEMP_VALID_LFT,
3313 .procname = "temp_valid_lft",
3314 .data = &ipv6_devconf.temp_valid_lft,
3315 .maxlen = sizeof(int),
3316 .mode = 0644,
3317 .proc_handler = &proc_dointvec,
3318 },
3319 {
3320 .ctl_name = NET_IPV6_TEMP_PREFERED_LFT,
3321 .procname = "temp_prefered_lft",
3322 .data = &ipv6_devconf.temp_prefered_lft,
3323 .maxlen = sizeof(int),
3324 .mode = 0644,
3325 .proc_handler = &proc_dointvec,
3326 },
3327 {
3328 .ctl_name = NET_IPV6_REGEN_MAX_RETRY,
3329 .procname = "regen_max_retry",
3330 .data = &ipv6_devconf.regen_max_retry,
3331 .maxlen = sizeof(int),
3332 .mode = 0644,
3333 .proc_handler = &proc_dointvec,
3334 },
3335 {
3336 .ctl_name = NET_IPV6_MAX_DESYNC_FACTOR,
3337 .procname = "max_desync_factor",
3338 .data = &ipv6_devconf.max_desync_factor,
3339 .maxlen = sizeof(int),
3340 .mode = 0644,
3341 .proc_handler = &proc_dointvec,
3342 },
3343 #endif
3344 {
3345 .ctl_name = NET_IPV6_MAX_ADDRESSES,
3346 .procname = "max_addresses",
3347 .data = &ipv6_devconf.max_addresses,
3348 .maxlen = sizeof(int),
3349 .mode = 0644,
3350 .proc_handler = &proc_dointvec,
3351 },
3352 {
3353 .ctl_name = 0, /* sentinel */
3354 }
3355 },
3356 .addrconf_dev = {
3357 {
3358 .ctl_name = NET_PROTO_CONF_ALL,
3359 .procname = "all",
3360 .mode = 0555,
3361 .child = addrconf_sysctl.addrconf_vars,
3362 },
3363 {
3364 .ctl_name = 0, /* sentinel */
3365 }
3366 },
3367 .addrconf_conf_dir = {
3368 {
3369 .ctl_name = NET_IPV6_CONF,
3370 .procname = "conf",
3371 .mode = 0555,
3372 .child = addrconf_sysctl.addrconf_dev,
3373 },
3374 {
3375 .ctl_name = 0, /* sentinel */
3376 }
3377 },
3378 .addrconf_proto_dir = {
3379 {
3380 .ctl_name = NET_IPV6,
3381 .procname = "ipv6",
3382 .mode = 0555,
3383 .child = addrconf_sysctl.addrconf_conf_dir,
3384 },
3385 {
3386 .ctl_name = 0, /* sentinel */
3387 }
3388 },
3389 .addrconf_root_dir = {
3390 {
3391 .ctl_name = CTL_NET,
3392 .procname = "net",
3393 .mode = 0555,
3394 .child = addrconf_sysctl.addrconf_proto_dir,
3395 },
3396 {
3397 .ctl_name = 0, /* sentinel */
3398 }
3399 },
3400 };
3401
3402 static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p)
3403 {
3404 int i;
3405 struct net_device *dev = idev ? idev->dev : NULL;
3406 struct addrconf_sysctl_table *t;
3407 char *dev_name = NULL;
3408
3409 t = kmalloc(sizeof(*t), GFP_KERNEL);
3410 if (t == NULL)
3411 return;
3412 memcpy(t, &addrconf_sysctl, sizeof(*t));
3413 for (i=0; t->addrconf_vars[i].data; i++) {
3414 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
3415 t->addrconf_vars[i].de = NULL;
3416 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
3417 }
3418 if (dev) {
3419 dev_name = dev->name;
3420 t->addrconf_dev[0].ctl_name = dev->ifindex;
3421 } else {
3422 dev_name = "default";
3423 t->addrconf_dev[0].ctl_name = NET_PROTO_CONF_DEFAULT;
3424 }
3425
3426 /*
3427 * Make a copy of dev_name, because '.procname' is regarded as const
3428 * by sysctl and we wouldn't want anyone to change it under our feet
3429 * (see SIOCSIFNAME).
3430 */
3431 dev_name = kstrdup(dev_name, GFP_KERNEL);
3432 if (!dev_name)
3433 goto free;
3434
3435 t->addrconf_dev[0].procname = dev_name;
3436
3437 t->addrconf_dev[0].child = t->addrconf_vars;
3438 t->addrconf_dev[0].de = NULL;
3439 t->addrconf_conf_dir[0].child = t->addrconf_dev;
3440 t->addrconf_conf_dir[0].de = NULL;
3441 t->addrconf_proto_dir[0].child = t->addrconf_conf_dir;
3442 t->addrconf_proto_dir[0].de = NULL;
3443 t->addrconf_root_dir[0].child = t->addrconf_proto_dir;
3444 t->addrconf_root_dir[0].de = NULL;
3445
3446 t->sysctl_header = register_sysctl_table(t->addrconf_root_dir, 0);
3447 if (t->sysctl_header == NULL)
3448 goto free_procname;
3449 else
3450 p->sysctl = t;
3451 return;
3452
3453 /* error path */
3454 free_procname:
3455 kfree(dev_name);
3456 free:
3457 kfree(t);
3458
3459 return;
3460 }
3461
3462 static void addrconf_sysctl_unregister(struct ipv6_devconf *p)
3463 {
3464 if (p->sysctl) {
3465 struct addrconf_sysctl_table *t = p->sysctl;
3466 p->sysctl = NULL;
3467 unregister_sysctl_table(t->sysctl_header);
3468 kfree(t->addrconf_dev[0].procname);
3469 kfree(t);
3470 }
3471 }
3472
3473
3474 #endif
3475
3476 /*
3477 * Device notifier
3478 */
3479
3480 int register_inet6addr_notifier(struct notifier_block *nb)
3481 {
3482 return notifier_chain_register(&inet6addr_chain, nb);
3483 }
3484
3485 int unregister_inet6addr_notifier(struct notifier_block *nb)
3486 {
3487 return notifier_chain_unregister(&inet6addr_chain,nb);
3488 }
3489
3490 /*
3491 * Init / cleanup code
3492 */
3493
3494 int __init addrconf_init(void)
3495 {
3496 int err = 0;
3497
3498 /* The addrconf netdev notifier requires that loopback_dev
3499 * has it's ipv6 private information allocated and setup
3500 * before it can bring up and give link-local addresses
3501 * to other devices which are up.
3502 *
3503 * Unfortunately, loopback_dev is not necessarily the first
3504 * entry in the global dev_base list of net devices. In fact,
3505 * it is likely to be the very last entry on that list.
3506 * So this causes the notifier registry below to try and
3507 * give link-local addresses to all devices besides loopback_dev
3508 * first, then loopback_dev, which cases all the non-loopback_dev
3509 * devices to fail to get a link-local address.
3510 *
3511 * So, as a temporary fix, allocate the ipv6 structure for
3512 * loopback_dev first by hand.
3513 * Longer term, all of the dependencies ipv6 has upon the loopback
3514 * device and it being up should be removed.
3515 */
3516 rtnl_lock();
3517 if (!ipv6_add_dev(&loopback_dev))
3518 err = -ENOMEM;
3519 rtnl_unlock();
3520 if (err)
3521 return err;
3522
3523 register_netdevice_notifier(&ipv6_dev_notf);
3524
3525 #ifdef CONFIG_IPV6_PRIVACY
3526 md5_tfm = crypto_alloc_tfm("md5", 0);
3527 if (unlikely(md5_tfm == NULL))
3528 printk(KERN_WARNING
3529 "failed to load transform for md5\n");
3530 #endif
3531
3532 addrconf_verify(0);
3533 rtnetlink_links[PF_INET6] = inet6_rtnetlink_table;
3534 #ifdef CONFIG_SYSCTL
3535 addrconf_sysctl.sysctl_header =
3536 register_sysctl_table(addrconf_sysctl.addrconf_root_dir, 0);
3537 addrconf_sysctl_register(NULL, &ipv6_devconf_dflt);
3538 #endif
3539
3540 return 0;
3541 }
3542
3543 void __exit addrconf_cleanup(void)
3544 {
3545 struct net_device *dev;
3546 struct inet6_dev *idev;
3547 struct inet6_ifaddr *ifa;
3548 int i;
3549
3550 unregister_netdevice_notifier(&ipv6_dev_notf);
3551
3552 rtnetlink_links[PF_INET6] = NULL;
3553 #ifdef CONFIG_SYSCTL
3554 addrconf_sysctl_unregister(&ipv6_devconf_dflt);
3555 addrconf_sysctl_unregister(&ipv6_devconf);
3556 #endif
3557
3558 rtnl_lock();
3559
3560 /*
3561 * clean dev list.
3562 */
3563
3564 for (dev=dev_base; dev; dev=dev->next) {
3565 if ((idev = __in6_dev_get(dev)) == NULL)
3566 continue;
3567 addrconf_ifdown(dev, 1);
3568 }
3569 addrconf_ifdown(&loopback_dev, 2);
3570
3571 /*
3572 * Check hash table.
3573 */
3574
3575 write_lock_bh(&addrconf_hash_lock);
3576 for (i=0; i < IN6_ADDR_HSIZE; i++) {
3577 for (ifa=inet6_addr_lst[i]; ifa; ) {
3578 struct inet6_ifaddr *bifa;
3579
3580 bifa = ifa;
3581 ifa = ifa->lst_next;
3582 printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
3583 /* Do not free it; something is wrong.
3584 Now we can investigate it with debugger.
3585 */
3586 }
3587 }
3588 write_unlock_bh(&addrconf_hash_lock);
3589
3590 del_timer(&addr_chk_timer);
3591
3592 rtnl_unlock();
3593
3594 #ifdef CONFIG_IPV6_PRIVACY
3595 crypto_free_tfm(md5_tfm);
3596 md5_tfm = NULL;
3597 #endif
3598
3599 #ifdef CONFIG_PROC_FS
3600 proc_net_remove("if_inet6");
3601 #endif
3602 }
Ubuntu Artful kernel mirror