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ipv6: Clamp reported valid_lft to a minimum of 0
[net-next-2.6.git] / net / ipv6 / addrconf.c
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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 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 */
14
15/*
16 * Changes:
17 *
18 * Janos Farkas : delete timer on ifdown
19 * <chexum@bankinf.banki.hu>
20 * Andi Kleen : kill double kfree on module
21 * unload.
22 * Maciej W. Rozycki : FDDI support
23 * sekiya@USAGI : Don't send too many RS
24 * packets.
25 * yoshfuji@USAGI : Fixed interval between DAD
26 * packets.
27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
28 * address validation timer.
29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
30 * support.
31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
32 * address on a same interface.
33 * YOSHIFUJI Hideaki @USAGI : ARCnet support
34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
35 * seq_file.
36 * YOSHIFUJI Hideaki @USAGI : improved source address
37 * selection; consider scope,
38 * status etc.
39 */
40
41#include <linux/errno.h>
42#include <linux/types.h>
43#include <linux/kernel.h>
44#include <linux/socket.h>
45#include <linux/sockios.h>
46#include <linux/net.h>
47#include <linux/in6.h>
48#include <linux/netdevice.h>
49#include <linux/if_addr.h>
50#include <linux/if_arp.h>
51#include <linux/if_arcnet.h>
52#include <linux/if_infiniband.h>
53#include <linux/route.h>
54#include <linux/inetdevice.h>
55#include <linux/init.h>
56#include <linux/slab.h>
57#ifdef CONFIG_SYSCTL
58#include <linux/sysctl.h>
59#endif
60#include <linux/capability.h>
61#include <linux/delay.h>
62#include <linux/notifier.h>
63#include <linux/string.h>
64
65#include <net/net_namespace.h>
66#include <net/sock.h>
67#include <net/snmp.h>
68
69#include <net/ipv6.h>
70#include <net/protocol.h>
71#include <net/ndisc.h>
72#include <net/ip6_route.h>
73#include <net/addrconf.h>
74#include <net/tcp.h>
75#include <net/ip.h>
76#include <net/netlink.h>
77#include <net/pkt_sched.h>
78#include <linux/if_tunnel.h>
79#include <linux/rtnetlink.h>
80
81#ifdef CONFIG_IPV6_PRIVACY
82#include <linux/random.h>
83#endif
84
85#include <linux/uaccess.h>
86#include <asm/unaligned.h>
87
88#include <linux/proc_fs.h>
89#include <linux/seq_file.h>
90
91/* Set to 3 to get tracing... */
92#define ACONF_DEBUG 2
93
94#if ACONF_DEBUG >= 3
95#define ADBG(x) printk x
96#else
97#define ADBG(x)
98#endif
99
100#define INFINITY_LIFE_TIME 0xFFFFFFFF
101#define TIME_DELTA(a, b) ((unsigned long)((long)(a) - (long)(b)))
102
103#define ADDRCONF_TIMER_FUZZ_MINUS (HZ > 50 ? HZ/50 : 1)
104#define ADDRCONF_TIMER_FUZZ (HZ / 4)
105#define ADDRCONF_TIMER_FUZZ_MAX (HZ)
106
107#ifdef CONFIG_SYSCTL
108static void addrconf_sysctl_register(struct inet6_dev *idev);
109static void addrconf_sysctl_unregister(struct inet6_dev *idev);
110#else
111static inline void addrconf_sysctl_register(struct inet6_dev *idev)
112{
113}
114
115static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
116{
117}
118#endif
119
120#ifdef CONFIG_IPV6_PRIVACY
121static int __ipv6_regen_rndid(struct inet6_dev *idev);
122static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
123static void ipv6_regen_rndid(unsigned long data);
124
125static int desync_factor = MAX_DESYNC_FACTOR * HZ;
126#endif
127
128static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
129static int ipv6_count_addresses(struct inet6_dev *idev);
130
131/*
132 * Configured unicast address hash table
133 */
134static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
135static DEFINE_SPINLOCK(addrconf_hash_lock);
136
137static void addrconf_verify(unsigned long);
138
139static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
140static DEFINE_SPINLOCK(addrconf_verify_lock);
141
142static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
143static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
144
145static void addrconf_type_change(struct net_device *dev,
146 unsigned long event);
147static int addrconf_ifdown(struct net_device *dev, int how);
148
149static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
150static void addrconf_dad_timer(unsigned long data);
151static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
152static void addrconf_dad_run(struct inet6_dev *idev);
153static void addrconf_rs_timer(unsigned long data);
154static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
155static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
156
157static void inet6_prefix_notify(int event, struct inet6_dev *idev,
158 struct prefix_info *pinfo);
159static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
160 struct net_device *dev);
161
162static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
163
164static struct ipv6_devconf ipv6_devconf __read_mostly = {
165 .forwarding = 0,
166 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
167 .mtu6 = IPV6_MIN_MTU,
168 .accept_ra = 1,
169 .accept_redirects = 1,
170 .autoconf = 1,
171 .force_mld_version = 0,
172 .dad_transmits = 1,
173 .rtr_solicits = MAX_RTR_SOLICITATIONS,
174 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
175 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
176#ifdef CONFIG_IPV6_PRIVACY
177 .use_tempaddr = 0,
178 .temp_valid_lft = TEMP_VALID_LIFETIME,
179 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
180 .regen_max_retry = REGEN_MAX_RETRY,
181 .max_desync_factor = MAX_DESYNC_FACTOR,
182#endif
183 .max_addresses = IPV6_MAX_ADDRESSES,
184 .accept_ra_defrtr = 1,
185 .accept_ra_pinfo = 1,
186#ifdef CONFIG_IPV6_ROUTER_PREF
187 .accept_ra_rtr_pref = 1,
188 .rtr_probe_interval = 60 * HZ,
189#ifdef CONFIG_IPV6_ROUTE_INFO
190 .accept_ra_rt_info_max_plen = 0,
191#endif
192#endif
193 .proxy_ndp = 0,
194 .accept_source_route = 0, /* we do not accept RH0 by default. */
195 .disable_ipv6 = 0,
196 .accept_dad = 1,
197};
198
199static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
200 .forwarding = 0,
201 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
202 .mtu6 = IPV6_MIN_MTU,
203 .accept_ra = 1,
204 .accept_redirects = 1,
205 .autoconf = 1,
206 .dad_transmits = 1,
207 .rtr_solicits = MAX_RTR_SOLICITATIONS,
208 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
209 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
210#ifdef CONFIG_IPV6_PRIVACY
211 .use_tempaddr = 0,
212 .temp_valid_lft = TEMP_VALID_LIFETIME,
213 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
214 .regen_max_retry = REGEN_MAX_RETRY,
215 .max_desync_factor = MAX_DESYNC_FACTOR,
216#endif
217 .max_addresses = IPV6_MAX_ADDRESSES,
218 .accept_ra_defrtr = 1,
219 .accept_ra_pinfo = 1,
220#ifdef CONFIG_IPV6_ROUTER_PREF
221 .accept_ra_rtr_pref = 1,
222 .rtr_probe_interval = 60 * HZ,
223#ifdef CONFIG_IPV6_ROUTE_INFO
224 .accept_ra_rt_info_max_plen = 0,
225#endif
226#endif
227 .proxy_ndp = 0,
228 .accept_source_route = 0, /* we do not accept RH0 by default. */
229 .disable_ipv6 = 0,
230 .accept_dad = 1,
231};
232
233/* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
234const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
235const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
236const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
237const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
238
239/* Check if a valid qdisc is available */
240static inline bool addrconf_qdisc_ok(const struct net_device *dev)
241{
242 return !qdisc_tx_is_noop(dev);
243}
244
245/* Check if a route is valid prefix route */
246static inline int addrconf_is_prefix_route(const struct rt6_info *rt)
247{
248 return ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0);
249}
250
251static void addrconf_del_timer(struct inet6_ifaddr *ifp)
252{
253 if (del_timer(&ifp->timer))
254 __in6_ifa_put(ifp);
255}
256
257enum addrconf_timer_t {
258 AC_NONE,
259 AC_DAD,
260 AC_RS,
261};
262
263static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
264 enum addrconf_timer_t what,
265 unsigned long when)
266{
267 if (!del_timer(&ifp->timer))
268 in6_ifa_hold(ifp);
269
270 switch (what) {
271 case AC_DAD:
272 ifp->timer.function = addrconf_dad_timer;
273 break;
274 case AC_RS:
275 ifp->timer.function = addrconf_rs_timer;
276 break;
277 default:
278 break;
279 }
280 ifp->timer.expires = jiffies + when;
281 add_timer(&ifp->timer);
282}
283
284static int snmp6_alloc_dev(struct inet6_dev *idev)
285{
286 if (snmp_mib_init((void __percpu **)idev->stats.ipv6,
287 sizeof(struct ipstats_mib),
288 __alignof__(struct ipstats_mib)) < 0)
289 goto err_ip;
290 if (snmp_mib_init((void __percpu **)idev->stats.icmpv6,
291 sizeof(struct icmpv6_mib),
292 __alignof__(struct icmpv6_mib)) < 0)
293 goto err_icmp;
294 if (snmp_mib_init((void __percpu **)idev->stats.icmpv6msg,
295 sizeof(struct icmpv6msg_mib),
296 __alignof__(struct icmpv6msg_mib)) < 0)
297 goto err_icmpmsg;
298
299 return 0;
300
301err_icmpmsg:
302 snmp_mib_free((void __percpu **)idev->stats.icmpv6);
303err_icmp:
304 snmp_mib_free((void __percpu **)idev->stats.ipv6);
305err_ip:
306 return -ENOMEM;
307}
308
309static void snmp6_free_dev(struct inet6_dev *idev)
310{
311 snmp_mib_free((void __percpu **)idev->stats.icmpv6msg);
312 snmp_mib_free((void __percpu **)idev->stats.icmpv6);
313 snmp_mib_free((void __percpu **)idev->stats.ipv6);
314}
315
316/* Nobody refers to this device, we may destroy it. */
317
318static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
319{
320 struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
321 kfree(idev);
322}
323
324void in6_dev_finish_destroy(struct inet6_dev *idev)
325{
326 struct net_device *dev = idev->dev;
327
328 WARN_ON(!list_empty(&idev->addr_list));
329 WARN_ON(idev->mc_list != NULL);
330
331#ifdef NET_REFCNT_DEBUG
332 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
333#endif
334 dev_put(dev);
335 if (!idev->dead) {
336 pr_warning("Freeing alive inet6 device %p\n", idev);
337 return;
338 }
339 snmp6_free_dev(idev);
340 call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
341}
342
343EXPORT_SYMBOL(in6_dev_finish_destroy);
344
345static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
346{
347 struct inet6_dev *ndev;
348
349 ASSERT_RTNL();
350
351 if (dev->mtu < IPV6_MIN_MTU)
352 return NULL;
353
354 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
355
356 if (ndev == NULL)
357 return NULL;
358
359 rwlock_init(&ndev->lock);
360 ndev->dev = dev;
361 INIT_LIST_HEAD(&ndev->addr_list);
362
363 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
364 ndev->cnf.mtu6 = dev->mtu;
365 ndev->cnf.sysctl = NULL;
366 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
367 if (ndev->nd_parms == NULL) {
368 kfree(ndev);
369 return NULL;
370 }
371 if (ndev->cnf.forwarding)
372 dev_disable_lro(dev);
373 /* We refer to the device */
374 dev_hold(dev);
375
376 if (snmp6_alloc_dev(ndev) < 0) {
377 ADBG((KERN_WARNING
378 "%s(): cannot allocate memory for statistics; dev=%s.\n",
379 __func__, dev->name));
380 neigh_parms_release(&nd_tbl, ndev->nd_parms);
381 ndev->dead = 1;
382 in6_dev_finish_destroy(ndev);
383 return NULL;
384 }
385
386 if (snmp6_register_dev(ndev) < 0) {
387 ADBG((KERN_WARNING
388 "%s(): cannot create /proc/net/dev_snmp6/%s\n",
389 __func__, dev->name));
390 neigh_parms_release(&nd_tbl, ndev->nd_parms);
391 ndev->dead = 1;
392 in6_dev_finish_destroy(ndev);
393 return NULL;
394 }
395
396 /* One reference from device. We must do this before
397 * we invoke __ipv6_regen_rndid().
398 */
399 in6_dev_hold(ndev);
400
401 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
402 ndev->cnf.accept_dad = -1;
403
404#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
405 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
406 printk(KERN_INFO
407 "%s: Disabled Multicast RS\n",
408 dev->name);
409 ndev->cnf.rtr_solicits = 0;
410 }
411#endif
412
413#ifdef CONFIG_IPV6_PRIVACY
414 INIT_LIST_HEAD(&ndev->tempaddr_list);
415 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
416 if ((dev->flags&IFF_LOOPBACK) ||
417 dev->type == ARPHRD_TUNNEL ||
418 dev->type == ARPHRD_TUNNEL6 ||
419 dev->type == ARPHRD_SIT ||
420 dev->type == ARPHRD_NONE) {
421 printk(KERN_INFO
422 "%s: Disabled Privacy Extensions\n",
423 dev->name);
424 ndev->cnf.use_tempaddr = -1;
425 } else {
426 in6_dev_hold(ndev);
427 ipv6_regen_rndid((unsigned long) ndev);
428 }
429#endif
430
431 if (netif_running(dev) && addrconf_qdisc_ok(dev))
432 ndev->if_flags |= IF_READY;
433
434 ipv6_mc_init_dev(ndev);
435 ndev->tstamp = jiffies;
436 addrconf_sysctl_register(ndev);
437 /* protected by rtnl_lock */
438 rcu_assign_pointer(dev->ip6_ptr, ndev);
439
440 /* Join all-node multicast group */
441 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
442
443 return ndev;
444}
445
446static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
447{
448 struct inet6_dev *idev;
449
450 ASSERT_RTNL();
451
452 idev = __in6_dev_get(dev);
453 if (!idev) {
454 idev = ipv6_add_dev(dev);
455 if (!idev)
456 return NULL;
457 }
458
459 if (dev->flags&IFF_UP)
460 ipv6_mc_up(idev);
461 return idev;
462}
463
464#ifdef CONFIG_SYSCTL
465static void dev_forward_change(struct inet6_dev *idev)
466{
467 struct net_device *dev;
468 struct inet6_ifaddr *ifa;
469
470 if (!idev)
471 return;
472 dev = idev->dev;
473 if (idev->cnf.forwarding)
474 dev_disable_lro(dev);
475 if (dev && (dev->flags & IFF_MULTICAST)) {
476 if (idev->cnf.forwarding)
477 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
478 else
479 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
480 }
481
482 list_for_each_entry(ifa, &idev->addr_list, if_list) {
483 if (ifa->flags&IFA_F_TENTATIVE)
484 continue;
485 if (idev->cnf.forwarding)
486 addrconf_join_anycast(ifa);
487 else
488 addrconf_leave_anycast(ifa);
489 }
490}
491
492
493static void addrconf_forward_change(struct net *net, __s32 newf)
494{
495 struct net_device *dev;
496 struct inet6_dev *idev;
497
498 rcu_read_lock();
499 for_each_netdev_rcu(net, dev) {
500 idev = __in6_dev_get(dev);
501 if (idev) {
502 int changed = (!idev->cnf.forwarding) ^ (!newf);
503 idev->cnf.forwarding = newf;
504 if (changed)
505 dev_forward_change(idev);
506 }
507 }
508 rcu_read_unlock();
509}
510
511static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old)
512{
513 struct net *net;
514
515 net = (struct net *)table->extra2;
516 if (p == &net->ipv6.devconf_dflt->forwarding)
517 return 0;
518
519 if (!rtnl_trylock()) {
520 /* Restore the original values before restarting */
521 *p = old;
522 return restart_syscall();
523 }
524
525 if (p == &net->ipv6.devconf_all->forwarding) {
526 __s32 newf = net->ipv6.devconf_all->forwarding;
527 net->ipv6.devconf_dflt->forwarding = newf;
528 addrconf_forward_change(net, newf);
529 } else if ((!*p) ^ (!old))
530 dev_forward_change((struct inet6_dev *)table->extra1);
531 rtnl_unlock();
532
533 if (*p)
534 rt6_purge_dflt_routers(net);
535 return 1;
536}
537#endif
538
539static void inet6_ifa_finish_destroy_rcu(struct rcu_head *head)
540{
541 struct inet6_ifaddr *ifp = container_of(head, struct inet6_ifaddr, rcu);
542 kfree(ifp);
543}
544
545/* Nobody refers to this ifaddr, destroy it */
546void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
547{
548 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
549
550#ifdef NET_REFCNT_DEBUG
551 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
552#endif
553
554 in6_dev_put(ifp->idev);
555
556 if (del_timer(&ifp->timer))
557 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp);
558
559 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
560 pr_warning("Freeing alive inet6 address %p\n", ifp);
561 return;
562 }
563 dst_release(&ifp->rt->dst);
564
565 call_rcu(&ifp->rcu, inet6_ifa_finish_destroy_rcu);
566}
567
568static void
569ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
570{
571 struct list_head *p;
572 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
573
574 /*
575 * Each device address list is sorted in order of scope -
576 * global before linklocal.
577 */
578 list_for_each(p, &idev->addr_list) {
579 struct inet6_ifaddr *ifa
580 = list_entry(p, struct inet6_ifaddr, if_list);
581 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
582 break;
583 }
584
585 list_add_tail(&ifp->if_list, p);
586}
587
588static u32 ipv6_addr_hash(const struct in6_addr *addr)
589{
590 /*
591 * We perform the hash function over the last 64 bits of the address
592 * This will include the IEEE address token on links that support it.
593 */
594 return jhash_2words((__force u32)addr->s6_addr32[2],
595 (__force u32)addr->s6_addr32[3], 0)
596 & (IN6_ADDR_HSIZE - 1);
597}
598
599/* On success it returns ifp with increased reference count */
600
601static struct inet6_ifaddr *
602ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
603 int scope, u32 flags)
604{
605 struct inet6_ifaddr *ifa = NULL;
606 struct rt6_info *rt;
607 unsigned int hash;
608 int err = 0;
609 int addr_type = ipv6_addr_type(addr);
610
611 if (addr_type == IPV6_ADDR_ANY ||
612 addr_type & IPV6_ADDR_MULTICAST ||
613 (!(idev->dev->flags & IFF_LOOPBACK) &&
614 addr_type & IPV6_ADDR_LOOPBACK))
615 return ERR_PTR(-EADDRNOTAVAIL);
616
617 rcu_read_lock_bh();
618 if (idev->dead) {
619 err = -ENODEV; /*XXX*/
620 goto out2;
621 }
622
623 if (idev->cnf.disable_ipv6) {
624 err = -EACCES;
625 goto out2;
626 }
627
628 spin_lock(&addrconf_hash_lock);
629
630 /* Ignore adding duplicate addresses on an interface */
631 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
632 ADBG(("ipv6_add_addr: already assigned\n"));
633 err = -EEXIST;
634 goto out;
635 }
636
637 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
638
639 if (ifa == NULL) {
640 ADBG(("ipv6_add_addr: malloc failed\n"));
641 err = -ENOBUFS;
642 goto out;
643 }
644
645 rt = addrconf_dst_alloc(idev, addr, 0);
646 if (IS_ERR(rt)) {
647 err = PTR_ERR(rt);
648 goto out;
649 }
650
651 ipv6_addr_copy(&ifa->addr, addr);
652
653 spin_lock_init(&ifa->lock);
654 spin_lock_init(&ifa->state_lock);
655 init_timer(&ifa->timer);
656 INIT_HLIST_NODE(&ifa->addr_lst);
657 ifa->timer.data = (unsigned long) ifa;
658 ifa->scope = scope;
659 ifa->prefix_len = pfxlen;
660 ifa->flags = flags | IFA_F_TENTATIVE;
661 ifa->cstamp = ifa->tstamp = jiffies;
662
663 ifa->rt = rt;
664
665 /*
666 * part one of RFC 4429, section 3.3
667 * We should not configure an address as
668 * optimistic if we do not yet know the link
669 * layer address of our nexhop router
670 */
671
672 if (rt->rt6i_nexthop == NULL)
673 ifa->flags &= ~IFA_F_OPTIMISTIC;
674
675 ifa->idev = idev;
676 in6_dev_hold(idev);
677 /* For caller */
678 in6_ifa_hold(ifa);
679
680 /* Add to big hash table */
681 hash = ipv6_addr_hash(addr);
682
683 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
684 spin_unlock(&addrconf_hash_lock);
685
686 write_lock(&idev->lock);
687 /* Add to inet6_dev unicast addr list. */
688 ipv6_link_dev_addr(idev, ifa);
689
690#ifdef CONFIG_IPV6_PRIVACY
691 if (ifa->flags&IFA_F_TEMPORARY) {
692 list_add(&ifa->tmp_list, &idev->tempaddr_list);
693 in6_ifa_hold(ifa);
694 }
695#endif
696
697 in6_ifa_hold(ifa);
698 write_unlock(&idev->lock);
699out2:
700 rcu_read_unlock_bh();
701
702 if (likely(err == 0))
703 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
704 else {
705 kfree(ifa);
706 ifa = ERR_PTR(err);
707 }
708
709 return ifa;
710out:
711 spin_unlock(&addrconf_hash_lock);
712 goto out2;
713}
714
715/* This function wants to get referenced ifp and releases it before return */
716
717static void ipv6_del_addr(struct inet6_ifaddr *ifp)
718{
719 struct inet6_ifaddr *ifa, *ifn;
720 struct inet6_dev *idev = ifp->idev;
721 int state;
722 int hash;
723 int deleted = 0, onlink = 0;
724 unsigned long expires = jiffies;
725
726 hash = ipv6_addr_hash(&ifp->addr);
727
728 spin_lock_bh(&ifp->state_lock);
729 state = ifp->state;
730 ifp->state = INET6_IFADDR_STATE_DEAD;
731 spin_unlock_bh(&ifp->state_lock);
732
733 if (state == INET6_IFADDR_STATE_DEAD)
734 goto out;
735
736 spin_lock_bh(&addrconf_hash_lock);
737 hlist_del_init_rcu(&ifp->addr_lst);
738 spin_unlock_bh(&addrconf_hash_lock);
739
740 write_lock_bh(&idev->lock);
741#ifdef CONFIG_IPV6_PRIVACY
742 if (ifp->flags&IFA_F_TEMPORARY) {
743 list_del(&ifp->tmp_list);
744 if (ifp->ifpub) {
745 in6_ifa_put(ifp->ifpub);
746 ifp->ifpub = NULL;
747 }
748 __in6_ifa_put(ifp);
749 }
750#endif
751
752 list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) {
753 if (ifa == ifp) {
754 list_del_init(&ifp->if_list);
755 __in6_ifa_put(ifp);
756
757 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
758 break;
759 deleted = 1;
760 continue;
761 } else if (ifp->flags & IFA_F_PERMANENT) {
762 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
763 ifp->prefix_len)) {
764 if (ifa->flags & IFA_F_PERMANENT) {
765 onlink = 1;
766 if (deleted)
767 break;
768 } else {
769 unsigned long lifetime;
770
771 if (!onlink)
772 onlink = -1;
773
774 spin_lock(&ifa->lock);
775
776 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
777 /*
778 * Note: Because this address is
779 * not permanent, lifetime <
780 * LONG_MAX / HZ here.
781 */
782 if (time_before(expires,
783 ifa->tstamp + lifetime * HZ))
784 expires = ifa->tstamp + lifetime * HZ;
785 spin_unlock(&ifa->lock);
786 }
787 }
788 }
789 }
790 write_unlock_bh(&idev->lock);
791
792 addrconf_del_timer(ifp);
793
794 ipv6_ifa_notify(RTM_DELADDR, ifp);
795
796 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
797
798 /*
799 * Purge or update corresponding prefix
800 *
801 * 1) we don't purge prefix here if address was not permanent.
802 * prefix is managed by its own lifetime.
803 * 2) if there're no addresses, delete prefix.
804 * 3) if there're still other permanent address(es),
805 * corresponding prefix is still permanent.
806 * 4) otherwise, update prefix lifetime to the
807 * longest valid lifetime among the corresponding
808 * addresses on the device.
809 * Note: subsequent RA will update lifetime.
810 *
811 * --yoshfuji
812 */
813 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
814 struct in6_addr prefix;
815 struct rt6_info *rt;
816 struct net *net = dev_net(ifp->idev->dev);
817 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
818 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1);
819
820 if (rt && addrconf_is_prefix_route(rt)) {
821 if (onlink == 0) {
822 ip6_del_rt(rt);
823 rt = NULL;
824 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
825 rt->rt6i_expires = expires;
826 rt->rt6i_flags |= RTF_EXPIRES;
827 }
828 }
829 dst_release(&rt->dst);
830 }
831
832out:
833 in6_ifa_put(ifp);
834}
835
836#ifdef CONFIG_IPV6_PRIVACY
837static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
838{
839 struct inet6_dev *idev = ifp->idev;
840 struct in6_addr addr, *tmpaddr;
841 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
842 unsigned long regen_advance;
843 int tmp_plen;
844 int ret = 0;
845 int max_addresses;
846 u32 addr_flags;
847
848 write_lock(&idev->lock);
849 if (ift) {
850 spin_lock_bh(&ift->lock);
851 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
852 spin_unlock_bh(&ift->lock);
853 tmpaddr = &addr;
854 } else {
855 tmpaddr = NULL;
856 }
857retry:
858 in6_dev_hold(idev);
859 if (idev->cnf.use_tempaddr <= 0) {
860 write_unlock(&idev->lock);
861 printk(KERN_INFO
862 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
863 in6_dev_put(idev);
864 ret = -1;
865 goto out;
866 }
867 spin_lock_bh(&ifp->lock);
868 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
869 idev->cnf.use_tempaddr = -1; /*XXX*/
870 spin_unlock_bh(&ifp->lock);
871 write_unlock(&idev->lock);
872 printk(KERN_WARNING
873 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
874 in6_dev_put(idev);
875 ret = -1;
876 goto out;
877 }
878 in6_ifa_hold(ifp);
879 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
880 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
881 spin_unlock_bh(&ifp->lock);
882 write_unlock(&idev->lock);
883 printk(KERN_WARNING
884 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
885 in6_ifa_put(ifp);
886 in6_dev_put(idev);
887 ret = -1;
888 goto out;
889 }
890 memcpy(&addr.s6_addr[8], idev->rndid, 8);
891 tmp_valid_lft = min_t(__u32,
892 ifp->valid_lft,
893 idev->cnf.temp_valid_lft);
894 tmp_prefered_lft = min_t(__u32,
895 ifp->prefered_lft,
896 idev->cnf.temp_prefered_lft - desync_factor / HZ);
897 tmp_plen = ifp->prefix_len;
898 max_addresses = idev->cnf.max_addresses;
899 tmp_cstamp = ifp->cstamp;
900 tmp_tstamp = ifp->tstamp;
901 spin_unlock_bh(&ifp->lock);
902
903 regen_advance = idev->cnf.regen_max_retry *
904 idev->cnf.dad_transmits *
905 idev->nd_parms->retrans_time / HZ;
906 write_unlock(&idev->lock);
907
908 /* A temporary address is created only if this calculated Preferred
909 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
910 * an implementation must not create a temporary address with a zero
911 * Preferred Lifetime.
912 */
913 if (tmp_prefered_lft <= regen_advance) {
914 in6_ifa_put(ifp);
915 in6_dev_put(idev);
916 ret = -1;
917 goto out;
918 }
919
920 addr_flags = IFA_F_TEMPORARY;
921 /* set in addrconf_prefix_rcv() */
922 if (ifp->flags & IFA_F_OPTIMISTIC)
923 addr_flags |= IFA_F_OPTIMISTIC;
924
925 ift = !max_addresses ||
926 ipv6_count_addresses(idev) < max_addresses ?
927 ipv6_add_addr(idev, &addr, tmp_plen,
928 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
929 addr_flags) : NULL;
930 if (!ift || IS_ERR(ift)) {
931 in6_ifa_put(ifp);
932 in6_dev_put(idev);
933 printk(KERN_INFO
934 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
935 tmpaddr = &addr;
936 write_lock(&idev->lock);
937 goto retry;
938 }
939
940 spin_lock_bh(&ift->lock);
941 ift->ifpub = ifp;
942 ift->valid_lft = tmp_valid_lft;
943 ift->prefered_lft = tmp_prefered_lft;
944 ift->cstamp = tmp_cstamp;
945 ift->tstamp = tmp_tstamp;
946 spin_unlock_bh(&ift->lock);
947
948 addrconf_dad_start(ift, 0);
949 in6_ifa_put(ift);
950 in6_dev_put(idev);
951out:
952 return ret;
953}
954#endif
955
956/*
957 * Choose an appropriate source address (RFC3484)
958 */
959enum {
960 IPV6_SADDR_RULE_INIT = 0,
961 IPV6_SADDR_RULE_LOCAL,
962 IPV6_SADDR_RULE_SCOPE,
963 IPV6_SADDR_RULE_PREFERRED,
964#ifdef CONFIG_IPV6_MIP6
965 IPV6_SADDR_RULE_HOA,
966#endif
967 IPV6_SADDR_RULE_OIF,
968 IPV6_SADDR_RULE_LABEL,
969#ifdef CONFIG_IPV6_PRIVACY
970 IPV6_SADDR_RULE_PRIVACY,
971#endif
972 IPV6_SADDR_RULE_ORCHID,
973 IPV6_SADDR_RULE_PREFIX,
974 IPV6_SADDR_RULE_MAX
975};
976
977struct ipv6_saddr_score {
978 int rule;
979 int addr_type;
980 struct inet6_ifaddr *ifa;
981 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
982 int scopedist;
983 int matchlen;
984};
985
986struct ipv6_saddr_dst {
987 const struct in6_addr *addr;
988 int ifindex;
989 int scope;
990 int label;
991 unsigned int prefs;
992};
993
994static inline int ipv6_saddr_preferred(int type)
995{
996 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
997 return 1;
998 return 0;
999}
1000
1001static int ipv6_get_saddr_eval(struct net *net,
1002 struct ipv6_saddr_score *score,
1003 struct ipv6_saddr_dst *dst,
1004 int i)
1005{
1006 int ret;
1007
1008 if (i <= score->rule) {
1009 switch (i) {
1010 case IPV6_SADDR_RULE_SCOPE:
1011 ret = score->scopedist;
1012 break;
1013 case IPV6_SADDR_RULE_PREFIX:
1014 ret = score->matchlen;
1015 break;
1016 default:
1017 ret = !!test_bit(i, score->scorebits);
1018 }
1019 goto out;
1020 }
1021
1022 switch (i) {
1023 case IPV6_SADDR_RULE_INIT:
1024 /* Rule 0: remember if hiscore is not ready yet */
1025 ret = !!score->ifa;
1026 break;
1027 case IPV6_SADDR_RULE_LOCAL:
1028 /* Rule 1: Prefer same address */
1029 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1030 break;
1031 case IPV6_SADDR_RULE_SCOPE:
1032 /* Rule 2: Prefer appropriate scope
1033 *
1034 * ret
1035 * ^
1036 * -1 | d 15
1037 * ---+--+-+---> scope
1038 * |
1039 * | d is scope of the destination.
1040 * B-d | \
1041 * | \ <- smaller scope is better if
1042 * B-15 | \ if scope is enough for destinaion.
1043 * | ret = B - scope (-1 <= scope >= d <= 15).
1044 * d-C-1 | /
1045 * |/ <- greater is better
1046 * -C / if scope is not enough for destination.
1047 * /| ret = scope - C (-1 <= d < scope <= 15).
1048 *
1049 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1050 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1051 * Assume B = 0 and we get C > 29.
1052 */
1053 ret = __ipv6_addr_src_scope(score->addr_type);
1054 if (ret >= dst->scope)
1055 ret = -ret;
1056 else
1057 ret -= 128; /* 30 is enough */
1058 score->scopedist = ret;
1059 break;
1060 case IPV6_SADDR_RULE_PREFERRED:
1061 /* Rule 3: Avoid deprecated and optimistic addresses */
1062 ret = ipv6_saddr_preferred(score->addr_type) ||
1063 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1064 break;
1065#ifdef CONFIG_IPV6_MIP6
1066 case IPV6_SADDR_RULE_HOA:
1067 {
1068 /* Rule 4: Prefer home address */
1069 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1070 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1071 break;
1072 }
1073#endif
1074 case IPV6_SADDR_RULE_OIF:
1075 /* Rule 5: Prefer outgoing interface */
1076 ret = (!dst->ifindex ||
1077 dst->ifindex == score->ifa->idev->dev->ifindex);
1078 break;
1079 case IPV6_SADDR_RULE_LABEL:
1080 /* Rule 6: Prefer matching label */
1081 ret = ipv6_addr_label(net,
1082 &score->ifa->addr, score->addr_type,
1083 score->ifa->idev->dev->ifindex) == dst->label;
1084 break;
1085#ifdef CONFIG_IPV6_PRIVACY
1086 case IPV6_SADDR_RULE_PRIVACY:
1087 {
1088 /* Rule 7: Prefer public address
1089 * Note: prefer temprary address if use_tempaddr >= 2
1090 */
1091 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1092 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1093 score->ifa->idev->cnf.use_tempaddr >= 2;
1094 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1095 break;
1096 }
1097#endif
1098 case IPV6_SADDR_RULE_ORCHID:
1099 /* Rule 8-: Prefer ORCHID vs ORCHID or
1100 * non-ORCHID vs non-ORCHID
1101 */
1102 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1103 ipv6_addr_orchid(dst->addr));
1104 break;
1105 case IPV6_SADDR_RULE_PREFIX:
1106 /* Rule 8: Use longest matching prefix */
1107 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr,
1108 dst->addr);
1109 break;
1110 default:
1111 ret = 0;
1112 }
1113
1114 if (ret)
1115 __set_bit(i, score->scorebits);
1116 score->rule = i;
1117out:
1118 return ret;
1119}
1120
1121int ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev,
1122 const struct in6_addr *daddr, unsigned int prefs,
1123 struct in6_addr *saddr)
1124{
1125 struct ipv6_saddr_score scores[2],
1126 *score = &scores[0], *hiscore = &scores[1];
1127 struct ipv6_saddr_dst dst;
1128 struct net_device *dev;
1129 int dst_type;
1130
1131 dst_type = __ipv6_addr_type(daddr);
1132 dst.addr = daddr;
1133 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1134 dst.scope = __ipv6_addr_src_scope(dst_type);
1135 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1136 dst.prefs = prefs;
1137
1138 hiscore->rule = -1;
1139 hiscore->ifa = NULL;
1140
1141 rcu_read_lock();
1142
1143 for_each_netdev_rcu(net, dev) {
1144 struct inet6_dev *idev;
1145
1146 /* Candidate Source Address (section 4)
1147 * - multicast and link-local destination address,
1148 * the set of candidate source address MUST only
1149 * include addresses assigned to interfaces
1150 * belonging to the same link as the outgoing
1151 * interface.
1152 * (- For site-local destination addresses, the
1153 * set of candidate source addresses MUST only
1154 * include addresses assigned to interfaces
1155 * belonging to the same site as the outgoing
1156 * interface.)
1157 */
1158 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1159 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1160 dst.ifindex && dev->ifindex != dst.ifindex)
1161 continue;
1162
1163 idev = __in6_dev_get(dev);
1164 if (!idev)
1165 continue;
1166
1167 read_lock_bh(&idev->lock);
1168 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1169 int i;
1170
1171 /*
1172 * - Tentative Address (RFC2462 section 5.4)
1173 * - A tentative address is not considered
1174 * "assigned to an interface" in the traditional
1175 * sense, unless it is also flagged as optimistic.
1176 * - Candidate Source Address (section 4)
1177 * - In any case, anycast addresses, multicast
1178 * addresses, and the unspecified address MUST
1179 * NOT be included in a candidate set.
1180 */
1181 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1182 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1183 continue;
1184
1185 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1186
1187 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1188 score->addr_type & IPV6_ADDR_MULTICAST)) {
1189 LIMIT_NETDEBUG(KERN_DEBUG
1190 "ADDRCONF: unspecified / multicast address "
1191 "assigned as unicast address on %s",
1192 dev->name);
1193 continue;
1194 }
1195
1196 score->rule = -1;
1197 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1198
1199 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1200 int minihiscore, miniscore;
1201
1202 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1203 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1204
1205 if (minihiscore > miniscore) {
1206 if (i == IPV6_SADDR_RULE_SCOPE &&
1207 score->scopedist > 0) {
1208 /*
1209 * special case:
1210 * each remaining entry
1211 * has too small (not enough)
1212 * scope, because ifa entries
1213 * are sorted by their scope
1214 * values.
1215 */
1216 goto try_nextdev;
1217 }
1218 break;
1219 } else if (minihiscore < miniscore) {
1220 if (hiscore->ifa)
1221 in6_ifa_put(hiscore->ifa);
1222
1223 in6_ifa_hold(score->ifa);
1224
1225 swap(hiscore, score);
1226
1227 /* restore our iterator */
1228 score->ifa = hiscore->ifa;
1229
1230 break;
1231 }
1232 }
1233 }
1234try_nextdev:
1235 read_unlock_bh(&idev->lock);
1236 }
1237 rcu_read_unlock();
1238
1239 if (!hiscore->ifa)
1240 return -EADDRNOTAVAIL;
1241
1242 ipv6_addr_copy(saddr, &hiscore->ifa->addr);
1243 in6_ifa_put(hiscore->ifa);
1244 return 0;
1245}
1246EXPORT_SYMBOL(ipv6_dev_get_saddr);
1247
1248int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1249 unsigned char banned_flags)
1250{
1251 struct inet6_dev *idev;
1252 int err = -EADDRNOTAVAIL;
1253
1254 rcu_read_lock();
1255 idev = __in6_dev_get(dev);
1256 if (idev) {
1257 struct inet6_ifaddr *ifp;
1258
1259 read_lock_bh(&idev->lock);
1260 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1261 if (ifp->scope == IFA_LINK &&
1262 !(ifp->flags & banned_flags)) {
1263 ipv6_addr_copy(addr, &ifp->addr);
1264 err = 0;
1265 break;
1266 }
1267 }
1268 read_unlock_bh(&idev->lock);
1269 }
1270 rcu_read_unlock();
1271 return err;
1272}
1273
1274static int ipv6_count_addresses(struct inet6_dev *idev)
1275{
1276 int cnt = 0;
1277 struct inet6_ifaddr *ifp;
1278
1279 read_lock_bh(&idev->lock);
1280 list_for_each_entry(ifp, &idev->addr_list, if_list)
1281 cnt++;
1282 read_unlock_bh(&idev->lock);
1283 return cnt;
1284}
1285
1286int ipv6_chk_addr(struct net *net, struct in6_addr *addr,
1287 struct net_device *dev, int strict)
1288{
1289 struct inet6_ifaddr *ifp;
1290 struct hlist_node *node;
1291 unsigned int hash = ipv6_addr_hash(addr);
1292
1293 rcu_read_lock_bh();
1294 hlist_for_each_entry_rcu(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1295 if (!net_eq(dev_net(ifp->idev->dev), net))
1296 continue;
1297 if (ipv6_addr_equal(&ifp->addr, addr) &&
1298 !(ifp->flags&IFA_F_TENTATIVE) &&
1299 (dev == NULL || ifp->idev->dev == dev ||
1300 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1301 rcu_read_unlock_bh();
1302 return 1;
1303 }
1304 }
1305
1306 rcu_read_unlock_bh();
1307 return 0;
1308}
1309EXPORT_SYMBOL(ipv6_chk_addr);
1310
1311static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1312 struct net_device *dev)
1313{
1314 unsigned int hash = ipv6_addr_hash(addr);
1315 struct inet6_ifaddr *ifp;
1316 struct hlist_node *node;
1317
1318 hlist_for_each_entry(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1319 if (!net_eq(dev_net(ifp->idev->dev), net))
1320 continue;
1321 if (ipv6_addr_equal(&ifp->addr, addr)) {
1322 if (dev == NULL || ifp->idev->dev == dev)
1323 return true;
1324 }
1325 }
1326 return false;
1327}
1328
1329int ipv6_chk_prefix(struct in6_addr *addr, struct net_device *dev)
1330{
1331 struct inet6_dev *idev;
1332 struct inet6_ifaddr *ifa;
1333 int onlink;
1334
1335 onlink = 0;
1336 rcu_read_lock();
1337 idev = __in6_dev_get(dev);
1338 if (idev) {
1339 read_lock_bh(&idev->lock);
1340 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1341 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1342 ifa->prefix_len);
1343 if (onlink)
1344 break;
1345 }
1346 read_unlock_bh(&idev->lock);
1347 }
1348 rcu_read_unlock();
1349 return onlink;
1350}
1351
1352EXPORT_SYMBOL(ipv6_chk_prefix);
1353
1354struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1355 struct net_device *dev, int strict)
1356{
1357 struct inet6_ifaddr *ifp, *result = NULL;
1358 unsigned int hash = ipv6_addr_hash(addr);
1359 struct hlist_node *node;
1360
1361 rcu_read_lock_bh();
1362 hlist_for_each_entry_rcu_bh(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1363 if (!net_eq(dev_net(ifp->idev->dev), net))
1364 continue;
1365 if (ipv6_addr_equal(&ifp->addr, addr)) {
1366 if (dev == NULL || ifp->idev->dev == dev ||
1367 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1368 result = ifp;
1369 in6_ifa_hold(ifp);
1370 break;
1371 }
1372 }
1373 }
1374 rcu_read_unlock_bh();
1375
1376 return result;
1377}
1378
1379/* Gets referenced address, destroys ifaddr */
1380
1381static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1382{
1383 if (ifp->flags&IFA_F_PERMANENT) {
1384 spin_lock_bh(&ifp->lock);
1385 addrconf_del_timer(ifp);
1386 ifp->flags |= IFA_F_TENTATIVE;
1387 if (dad_failed)
1388 ifp->flags |= IFA_F_DADFAILED;
1389 spin_unlock_bh(&ifp->lock);
1390 if (dad_failed)
1391 ipv6_ifa_notify(0, ifp);
1392 in6_ifa_put(ifp);
1393#ifdef CONFIG_IPV6_PRIVACY
1394 } else if (ifp->flags&IFA_F_TEMPORARY) {
1395 struct inet6_ifaddr *ifpub;
1396 spin_lock_bh(&ifp->lock);
1397 ifpub = ifp->ifpub;
1398 if (ifpub) {
1399 in6_ifa_hold(ifpub);
1400 spin_unlock_bh(&ifp->lock);
1401 ipv6_create_tempaddr(ifpub, ifp);
1402 in6_ifa_put(ifpub);
1403 } else {
1404 spin_unlock_bh(&ifp->lock);
1405 }
1406 ipv6_del_addr(ifp);
1407#endif
1408 } else
1409 ipv6_del_addr(ifp);
1410}
1411
1412static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1413{
1414 int err = -ENOENT;
1415
1416 spin_lock(&ifp->state_lock);
1417 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1418 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1419 err = 0;
1420 }
1421 spin_unlock(&ifp->state_lock);
1422
1423 return err;
1424}
1425
1426void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1427{
1428 struct inet6_dev *idev = ifp->idev;
1429
1430 if (addrconf_dad_end(ifp))
1431 return;
1432
1433 if (net_ratelimit())
1434 printk(KERN_INFO "%s: IPv6 duplicate address %pI6c detected!\n",
1435 ifp->idev->dev->name, &ifp->addr);
1436
1437 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1438 struct in6_addr addr;
1439
1440 addr.s6_addr32[0] = htonl(0xfe800000);
1441 addr.s6_addr32[1] = 0;
1442
1443 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1444 ipv6_addr_equal(&ifp->addr, &addr)) {
1445 /* DAD failed for link-local based on MAC address */
1446 idev->cnf.disable_ipv6 = 1;
1447
1448 printk(KERN_INFO "%s: IPv6 being disabled!\n",
1449 ifp->idev->dev->name);
1450 }
1451 }
1452
1453 addrconf_dad_stop(ifp, 1);
1454}
1455
1456/* Join to solicited addr multicast group. */
1457
1458void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1459{
1460 struct in6_addr maddr;
1461
1462 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1463 return;
1464
1465 addrconf_addr_solict_mult(addr, &maddr);
1466 ipv6_dev_mc_inc(dev, &maddr);
1467}
1468
1469void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1470{
1471 struct in6_addr maddr;
1472
1473 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1474 return;
1475
1476 addrconf_addr_solict_mult(addr, &maddr);
1477 __ipv6_dev_mc_dec(idev, &maddr);
1478}
1479
1480static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1481{
1482 struct in6_addr addr;
1483 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1484 if (ipv6_addr_any(&addr))
1485 return;
1486 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1487}
1488
1489static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1490{
1491 struct in6_addr addr;
1492 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1493 if (ipv6_addr_any(&addr))
1494 return;
1495 __ipv6_dev_ac_dec(ifp->idev, &addr);
1496}
1497
1498static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1499{
1500 if (dev->addr_len != ETH_ALEN)
1501 return -1;
1502 memcpy(eui, dev->dev_addr, 3);
1503 memcpy(eui + 5, dev->dev_addr + 3, 3);
1504
1505 /*
1506 * The zSeries OSA network cards can be shared among various
1507 * OS instances, but the OSA cards have only one MAC address.
1508 * This leads to duplicate address conflicts in conjunction
1509 * with IPv6 if more than one instance uses the same card.
1510 *
1511 * The driver for these cards can deliver a unique 16-bit
1512 * identifier for each instance sharing the same card. It is
1513 * placed instead of 0xFFFE in the interface identifier. The
1514 * "u" bit of the interface identifier is not inverted in this
1515 * case. Hence the resulting interface identifier has local
1516 * scope according to RFC2373.
1517 */
1518 if (dev->dev_id) {
1519 eui[3] = (dev->dev_id >> 8) & 0xFF;
1520 eui[4] = dev->dev_id & 0xFF;
1521 } else {
1522 eui[3] = 0xFF;
1523 eui[4] = 0xFE;
1524 eui[0] ^= 2;
1525 }
1526 return 0;
1527}
1528
1529static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1530{
1531 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1532 if (dev->addr_len != ARCNET_ALEN)
1533 return -1;
1534 memset(eui, 0, 7);
1535 eui[7] = *(u8*)dev->dev_addr;
1536 return 0;
1537}
1538
1539static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1540{
1541 if (dev->addr_len != INFINIBAND_ALEN)
1542 return -1;
1543 memcpy(eui, dev->dev_addr + 12, 8);
1544 eui[0] |= 2;
1545 return 0;
1546}
1547
1548int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1549{
1550 if (addr == 0)
1551 return -1;
1552 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1553 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1554 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1555 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1556 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1557 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1558 eui[1] = 0;
1559 eui[2] = 0x5E;
1560 eui[3] = 0xFE;
1561 memcpy(eui + 4, &addr, 4);
1562 return 0;
1563}
1564EXPORT_SYMBOL(__ipv6_isatap_ifid);
1565
1566static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1567{
1568 if (dev->priv_flags & IFF_ISATAP)
1569 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1570 return -1;
1571}
1572
1573static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1574{
1575 switch (dev->type) {
1576 case ARPHRD_ETHER:
1577 case ARPHRD_FDDI:
1578 case ARPHRD_IEEE802_TR:
1579 return addrconf_ifid_eui48(eui, dev);
1580 case ARPHRD_ARCNET:
1581 return addrconf_ifid_arcnet(eui, dev);
1582 case ARPHRD_INFINIBAND:
1583 return addrconf_ifid_infiniband(eui, dev);
1584 case ARPHRD_SIT:
1585 return addrconf_ifid_sit(eui, dev);
1586 }
1587 return -1;
1588}
1589
1590static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1591{
1592 int err = -1;
1593 struct inet6_ifaddr *ifp;
1594
1595 read_lock_bh(&idev->lock);
1596 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1597 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1598 memcpy(eui, ifp->addr.s6_addr+8, 8);
1599 err = 0;
1600 break;
1601 }
1602 }
1603 read_unlock_bh(&idev->lock);
1604 return err;
1605}
1606
1607#ifdef CONFIG_IPV6_PRIVACY
1608/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1609static int __ipv6_regen_rndid(struct inet6_dev *idev)
1610{
1611regen:
1612 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1613 idev->rndid[0] &= ~0x02;
1614
1615 /*
1616 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1617 * check if generated address is not inappropriate
1618 *
1619 * - Reserved subnet anycast (RFC 2526)
1620 * 11111101 11....11 1xxxxxxx
1621 * - ISATAP (RFC4214) 6.1
1622 * 00-00-5E-FE-xx-xx-xx-xx
1623 * - value 0
1624 * - XXX: already assigned to an address on the device
1625 */
1626 if (idev->rndid[0] == 0xfd &&
1627 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1628 (idev->rndid[7]&0x80))
1629 goto regen;
1630 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1631 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1632 goto regen;
1633 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1634 goto regen;
1635 }
1636
1637 return 0;
1638}
1639
1640static void ipv6_regen_rndid(unsigned long data)
1641{
1642 struct inet6_dev *idev = (struct inet6_dev *) data;
1643 unsigned long expires;
1644
1645 rcu_read_lock_bh();
1646 write_lock_bh(&idev->lock);
1647
1648 if (idev->dead)
1649 goto out;
1650
1651 if (__ipv6_regen_rndid(idev) < 0)
1652 goto out;
1653
1654 expires = jiffies +
1655 idev->cnf.temp_prefered_lft * HZ -
1656 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1657 if (time_before(expires, jiffies)) {
1658 printk(KERN_WARNING
1659 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1660 idev->dev->name);
1661 goto out;
1662 }
1663
1664 if (!mod_timer(&idev->regen_timer, expires))
1665 in6_dev_hold(idev);
1666
1667out:
1668 write_unlock_bh(&idev->lock);
1669 rcu_read_unlock_bh();
1670 in6_dev_put(idev);
1671}
1672
1673static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1674 int ret = 0;
1675
1676 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1677 ret = __ipv6_regen_rndid(idev);
1678 return ret;
1679}
1680#endif
1681
1682/*
1683 * Add prefix route.
1684 */
1685
1686static void
1687addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1688 unsigned long expires, u32 flags)
1689{
1690 struct fib6_config cfg = {
1691 .fc_table = RT6_TABLE_PREFIX,
1692 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1693 .fc_ifindex = dev->ifindex,
1694 .fc_expires = expires,
1695 .fc_dst_len = plen,
1696 .fc_flags = RTF_UP | flags,
1697 .fc_nlinfo.nl_net = dev_net(dev),
1698 .fc_protocol = RTPROT_KERNEL,
1699 };
1700
1701 ipv6_addr_copy(&cfg.fc_dst, pfx);
1702
1703 /* Prevent useless cloning on PtP SIT.
1704 This thing is done here expecting that the whole
1705 class of non-broadcast devices need not cloning.
1706 */
1707#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1708 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1709 cfg.fc_flags |= RTF_NONEXTHOP;
1710#endif
1711
1712 ip6_route_add(&cfg);
1713}
1714
1715/* Create "default" multicast route to the interface */
1716
1717static void addrconf_add_mroute(struct net_device *dev)
1718{
1719 struct fib6_config cfg = {
1720 .fc_table = RT6_TABLE_LOCAL,
1721 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1722 .fc_ifindex = dev->ifindex,
1723 .fc_dst_len = 8,
1724 .fc_flags = RTF_UP,
1725 .fc_nlinfo.nl_net = dev_net(dev),
1726 };
1727
1728 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1729
1730 ip6_route_add(&cfg);
1731}
1732
1733#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1734static void sit_route_add(struct net_device *dev)
1735{
1736 struct fib6_config cfg = {
1737 .fc_table = RT6_TABLE_MAIN,
1738 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1739 .fc_ifindex = dev->ifindex,
1740 .fc_dst_len = 96,
1741 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1742 .fc_nlinfo.nl_net = dev_net(dev),
1743 };
1744
1745 /* prefix length - 96 bits "::d.d.d.d" */
1746 ip6_route_add(&cfg);
1747}
1748#endif
1749
1750static void addrconf_add_lroute(struct net_device *dev)
1751{
1752 struct in6_addr addr;
1753
1754 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1755 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1756}
1757
1758static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1759{
1760 struct inet6_dev *idev;
1761
1762 ASSERT_RTNL();
1763
1764 idev = ipv6_find_idev(dev);
1765 if (!idev)
1766 return NULL;
1767
1768 /* Add default multicast route */
1769 addrconf_add_mroute(dev);
1770
1771 /* Add link local route */
1772 addrconf_add_lroute(dev);
1773 return idev;
1774}
1775
1776void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1777{
1778 struct prefix_info *pinfo;
1779 __u32 valid_lft;
1780 __u32 prefered_lft;
1781 int addr_type;
1782 struct inet6_dev *in6_dev;
1783 struct net *net = dev_net(dev);
1784
1785 pinfo = (struct prefix_info *) opt;
1786
1787 if (len < sizeof(struct prefix_info)) {
1788 ADBG(("addrconf: prefix option too short\n"));
1789 return;
1790 }
1791
1792 /*
1793 * Validation checks ([ADDRCONF], page 19)
1794 */
1795
1796 addr_type = ipv6_addr_type(&pinfo->prefix);
1797
1798 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1799 return;
1800
1801 valid_lft = ntohl(pinfo->valid);
1802 prefered_lft = ntohl(pinfo->prefered);
1803
1804 if (prefered_lft > valid_lft) {
1805 if (net_ratelimit())
1806 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1807 return;
1808 }
1809
1810 in6_dev = in6_dev_get(dev);
1811
1812 if (in6_dev == NULL) {
1813 if (net_ratelimit())
1814 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1815 return;
1816 }
1817
1818 /*
1819 * Two things going on here:
1820 * 1) Add routes for on-link prefixes
1821 * 2) Configure prefixes with the auto flag set
1822 */
1823
1824 if (pinfo->onlink) {
1825 struct rt6_info *rt;
1826 unsigned long rt_expires;
1827
1828 /* Avoid arithmetic overflow. Really, we could
1829 * save rt_expires in seconds, likely valid_lft,
1830 * but it would require division in fib gc, that it
1831 * not good.
1832 */
1833 if (HZ > USER_HZ)
1834 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
1835 else
1836 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
1837
1838 if (addrconf_finite_timeout(rt_expires))
1839 rt_expires *= HZ;
1840
1841 rt = rt6_lookup(net, &pinfo->prefix, NULL,
1842 dev->ifindex, 1);
1843
1844 if (rt && addrconf_is_prefix_route(rt)) {
1845 /* Autoconf prefix route */
1846 if (valid_lft == 0) {
1847 ip6_del_rt(rt);
1848 rt = NULL;
1849 } else if (addrconf_finite_timeout(rt_expires)) {
1850 /* not infinity */
1851 rt->rt6i_expires = jiffies + rt_expires;
1852 rt->rt6i_flags |= RTF_EXPIRES;
1853 } else {
1854 rt->rt6i_flags &= ~RTF_EXPIRES;
1855 rt->rt6i_expires = 0;
1856 }
1857 } else if (valid_lft) {
1858 clock_t expires = 0;
1859 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
1860 if (addrconf_finite_timeout(rt_expires)) {
1861 /* not infinity */
1862 flags |= RTF_EXPIRES;
1863 expires = jiffies_to_clock_t(rt_expires);
1864 }
1865 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1866 dev, expires, flags);
1867 }
1868 if (rt)
1869 dst_release(&rt->dst);
1870 }
1871
1872 /* Try to figure out our local address for this prefix */
1873
1874 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1875 struct inet6_ifaddr * ifp;
1876 struct in6_addr addr;
1877 int create = 0, update_lft = 0;
1878
1879 if (pinfo->prefix_len == 64) {
1880 memcpy(&addr, &pinfo->prefix, 8);
1881 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1882 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1883 in6_dev_put(in6_dev);
1884 return;
1885 }
1886 goto ok;
1887 }
1888 if (net_ratelimit())
1889 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1890 pinfo->prefix_len);
1891 in6_dev_put(in6_dev);
1892 return;
1893
1894ok:
1895
1896 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1897
1898 if (ifp == NULL && valid_lft) {
1899 int max_addresses = in6_dev->cnf.max_addresses;
1900 u32 addr_flags = 0;
1901
1902#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1903 if (in6_dev->cnf.optimistic_dad &&
1904 !net->ipv6.devconf_all->forwarding)
1905 addr_flags = IFA_F_OPTIMISTIC;
1906#endif
1907
1908 /* Do not allow to create too much of autoconfigured
1909 * addresses; this would be too easy way to crash kernel.
1910 */
1911 if (!max_addresses ||
1912 ipv6_count_addresses(in6_dev) < max_addresses)
1913 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1914 addr_type&IPV6_ADDR_SCOPE_MASK,
1915 addr_flags);
1916
1917 if (!ifp || IS_ERR(ifp)) {
1918 in6_dev_put(in6_dev);
1919 return;
1920 }
1921
1922 update_lft = create = 1;
1923 ifp->cstamp = jiffies;
1924 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1925 }
1926
1927 if (ifp) {
1928 int flags;
1929 unsigned long now;
1930#ifdef CONFIG_IPV6_PRIVACY
1931 struct inet6_ifaddr *ift;
1932#endif
1933 u32 stored_lft;
1934
1935 /* update lifetime (RFC2462 5.5.3 e) */
1936 spin_lock(&ifp->lock);
1937 now = jiffies;
1938 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1939 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1940 else
1941 stored_lft = 0;
1942 if (!update_lft && stored_lft) {
1943 if (valid_lft > MIN_VALID_LIFETIME ||
1944 valid_lft > stored_lft)
1945 update_lft = 1;
1946 else if (stored_lft <= MIN_VALID_LIFETIME) {
1947 /* valid_lft <= stored_lft is always true */
1948 /*
1949 * RFC 4862 Section 5.5.3e:
1950 * "Note that the preferred lifetime of
1951 * the corresponding address is always
1952 * reset to the Preferred Lifetime in
1953 * the received Prefix Information
1954 * option, regardless of whether the
1955 * valid lifetime is also reset or
1956 * ignored."
1957 *
1958 * So if the preferred lifetime in
1959 * this advertisement is different
1960 * than what we have stored, but the
1961 * valid lifetime is invalid, just
1962 * reset prefered_lft.
1963 *
1964 * We must set the valid lifetime
1965 * to the stored lifetime since we'll
1966 * be updating the timestamp below,
1967 * else we'll set it back to the
1968 * minumum.
1969 */
1970 if (prefered_lft != ifp->prefered_lft) {
1971 valid_lft = stored_lft;
1972 update_lft = 1;
1973 }
1974 } else {
1975 valid_lft = MIN_VALID_LIFETIME;
1976 if (valid_lft < prefered_lft)
1977 prefered_lft = valid_lft;
1978 update_lft = 1;
1979 }
1980 }
1981
1982 if (update_lft) {
1983 ifp->valid_lft = valid_lft;
1984 ifp->prefered_lft = prefered_lft;
1985 ifp->tstamp = now;
1986 flags = ifp->flags;
1987 ifp->flags &= ~IFA_F_DEPRECATED;
1988 spin_unlock(&ifp->lock);
1989
1990 if (!(flags&IFA_F_TENTATIVE))
1991 ipv6_ifa_notify(0, ifp);
1992 } else
1993 spin_unlock(&ifp->lock);
1994
1995#ifdef CONFIG_IPV6_PRIVACY
1996 read_lock_bh(&in6_dev->lock);
1997 /* update all temporary addresses in the list */
1998 list_for_each_entry(ift, &in6_dev->tempaddr_list, tmp_list) {
1999 /*
2000 * When adjusting the lifetimes of an existing
2001 * temporary address, only lower the lifetimes.
2002 * Implementations must not increase the
2003 * lifetimes of an existing temporary address
2004 * when processing a Prefix Information Option.
2005 */
2006 if (ifp != ift->ifpub)
2007 continue;
2008
2009 spin_lock(&ift->lock);
2010 flags = ift->flags;
2011 if (ift->valid_lft > valid_lft &&
2012 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
2013 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
2014 if (ift->prefered_lft > prefered_lft &&
2015 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
2016 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
2017 spin_unlock(&ift->lock);
2018 if (!(flags&IFA_F_TENTATIVE))
2019 ipv6_ifa_notify(0, ift);
2020 }
2021
2022 if (create && in6_dev->cnf.use_tempaddr > 0) {
2023 /*
2024 * When a new public address is created as described in [ADDRCONF],
2025 * also create a new temporary address.
2026 */
2027 read_unlock_bh(&in6_dev->lock);
2028 ipv6_create_tempaddr(ifp, NULL);
2029 } else {
2030 read_unlock_bh(&in6_dev->lock);
2031 }
2032#endif
2033 in6_ifa_put(ifp);
2034 addrconf_verify(0);
2035 }
2036 }
2037 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2038 in6_dev_put(in6_dev);
2039}
2040
2041/*
2042 * Set destination address.
2043 * Special case for SIT interfaces where we create a new "virtual"
2044 * device.
2045 */
2046int addrconf_set_dstaddr(struct net *net, void __user *arg)
2047{
2048 struct in6_ifreq ireq;
2049 struct net_device *dev;
2050 int err = -EINVAL;
2051
2052 rtnl_lock();
2053
2054 err = -EFAULT;
2055 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2056 goto err_exit;
2057
2058 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2059
2060 err = -ENODEV;
2061 if (dev == NULL)
2062 goto err_exit;
2063
2064#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2065 if (dev->type == ARPHRD_SIT) {
2066 const struct net_device_ops *ops = dev->netdev_ops;
2067 struct ifreq ifr;
2068 struct ip_tunnel_parm p;
2069
2070 err = -EADDRNOTAVAIL;
2071 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2072 goto err_exit;
2073
2074 memset(&p, 0, sizeof(p));
2075 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2076 p.iph.saddr = 0;
2077 p.iph.version = 4;
2078 p.iph.ihl = 5;
2079 p.iph.protocol = IPPROTO_IPV6;
2080 p.iph.ttl = 64;
2081 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2082
2083 if (ops->ndo_do_ioctl) {
2084 mm_segment_t oldfs = get_fs();
2085
2086 set_fs(KERNEL_DS);
2087 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2088 set_fs(oldfs);
2089 } else
2090 err = -EOPNOTSUPP;
2091
2092 if (err == 0) {
2093 err = -ENOBUFS;
2094 dev = __dev_get_by_name(net, p.name);
2095 if (!dev)
2096 goto err_exit;
2097 err = dev_open(dev);
2098 }
2099 }
2100#endif
2101
2102err_exit:
2103 rtnl_unlock();
2104 return err;
2105}
2106
2107/*
2108 * Manual configuration of address on an interface
2109 */
2110static int inet6_addr_add(struct net *net, int ifindex, struct in6_addr *pfx,
2111 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
2112 __u32 valid_lft)
2113{
2114 struct inet6_ifaddr *ifp;
2115 struct inet6_dev *idev;
2116 struct net_device *dev;
2117 int scope;
2118 u32 flags;
2119 clock_t expires;
2120 unsigned long timeout;
2121
2122 ASSERT_RTNL();
2123
2124 if (plen > 128)
2125 return -EINVAL;
2126
2127 /* check the lifetime */
2128 if (!valid_lft || prefered_lft > valid_lft)
2129 return -EINVAL;
2130
2131 dev = __dev_get_by_index(net, ifindex);
2132 if (!dev)
2133 return -ENODEV;
2134
2135 if ((idev = addrconf_add_dev(dev)) == NULL)
2136 return -ENOBUFS;
2137
2138 scope = ipv6_addr_scope(pfx);
2139
2140 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2141 if (addrconf_finite_timeout(timeout)) {
2142 expires = jiffies_to_clock_t(timeout * HZ);
2143 valid_lft = timeout;
2144 flags = RTF_EXPIRES;
2145 } else {
2146 expires = 0;
2147 flags = 0;
2148 ifa_flags |= IFA_F_PERMANENT;
2149 }
2150
2151 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2152 if (addrconf_finite_timeout(timeout)) {
2153 if (timeout == 0)
2154 ifa_flags |= IFA_F_DEPRECATED;
2155 prefered_lft = timeout;
2156 }
2157
2158 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2159
2160 if (!IS_ERR(ifp)) {
2161 spin_lock_bh(&ifp->lock);
2162 ifp->valid_lft = valid_lft;
2163 ifp->prefered_lft = prefered_lft;
2164 ifp->tstamp = jiffies;
2165 spin_unlock_bh(&ifp->lock);
2166
2167 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2168 expires, flags);
2169 /*
2170 * Note that section 3.1 of RFC 4429 indicates
2171 * that the Optimistic flag should not be set for
2172 * manually configured addresses
2173 */
2174 addrconf_dad_start(ifp, 0);
2175 in6_ifa_put(ifp);
2176 addrconf_verify(0);
2177 return 0;
2178 }
2179
2180 return PTR_ERR(ifp);
2181}
2182
2183static int inet6_addr_del(struct net *net, int ifindex, struct in6_addr *pfx,
2184 unsigned int plen)
2185{
2186 struct inet6_ifaddr *ifp;
2187 struct inet6_dev *idev;
2188 struct net_device *dev;
2189
2190 if (plen > 128)
2191 return -EINVAL;
2192
2193 dev = __dev_get_by_index(net, ifindex);
2194 if (!dev)
2195 return -ENODEV;
2196
2197 if ((idev = __in6_dev_get(dev)) == NULL)
2198 return -ENXIO;
2199
2200 read_lock_bh(&idev->lock);
2201 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2202 if (ifp->prefix_len == plen &&
2203 ipv6_addr_equal(pfx, &ifp->addr)) {
2204 in6_ifa_hold(ifp);
2205 read_unlock_bh(&idev->lock);
2206
2207 ipv6_del_addr(ifp);
2208
2209 /* If the last address is deleted administratively,
2210 disable IPv6 on this interface.
2211 */
2212 if (list_empty(&idev->addr_list))
2213 addrconf_ifdown(idev->dev, 1);
2214 return 0;
2215 }
2216 }
2217 read_unlock_bh(&idev->lock);
2218 return -EADDRNOTAVAIL;
2219}
2220
2221
2222int addrconf_add_ifaddr(struct net *net, void __user *arg)
2223{
2224 struct in6_ifreq ireq;
2225 int err;
2226
2227 if (!capable(CAP_NET_ADMIN))
2228 return -EPERM;
2229
2230 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2231 return -EFAULT;
2232
2233 rtnl_lock();
2234 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2235 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2236 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2237 rtnl_unlock();
2238 return err;
2239}
2240
2241int addrconf_del_ifaddr(struct net *net, void __user *arg)
2242{
2243 struct in6_ifreq ireq;
2244 int err;
2245
2246 if (!capable(CAP_NET_ADMIN))
2247 return -EPERM;
2248
2249 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2250 return -EFAULT;
2251
2252 rtnl_lock();
2253 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2254 ireq.ifr6_prefixlen);
2255 rtnl_unlock();
2256 return err;
2257}
2258
2259static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2260 int plen, int scope)
2261{
2262 struct inet6_ifaddr *ifp;
2263
2264 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT);
2265 if (!IS_ERR(ifp)) {
2266 spin_lock_bh(&ifp->lock);
2267 ifp->flags &= ~IFA_F_TENTATIVE;
2268 spin_unlock_bh(&ifp->lock);
2269 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2270 in6_ifa_put(ifp);
2271 }
2272}
2273
2274#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2275static void sit_add_v4_addrs(struct inet6_dev *idev)
2276{
2277 struct in6_addr addr;
2278 struct net_device *dev;
2279 struct net *net = dev_net(idev->dev);
2280 int scope;
2281
2282 ASSERT_RTNL();
2283
2284 memset(&addr, 0, sizeof(struct in6_addr));
2285 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2286
2287 if (idev->dev->flags&IFF_POINTOPOINT) {
2288 addr.s6_addr32[0] = htonl(0xfe800000);
2289 scope = IFA_LINK;
2290 } else {
2291 scope = IPV6_ADDR_COMPATv4;
2292 }
2293
2294 if (addr.s6_addr32[3]) {
2295 add_addr(idev, &addr, 128, scope);
2296 return;
2297 }
2298
2299 for_each_netdev(net, dev) {
2300 struct in_device * in_dev = __in_dev_get_rtnl(dev);
2301 if (in_dev && (dev->flags & IFF_UP)) {
2302 struct in_ifaddr * ifa;
2303
2304 int flag = scope;
2305
2306 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2307 int plen;
2308
2309 addr.s6_addr32[3] = ifa->ifa_local;
2310
2311 if (ifa->ifa_scope == RT_SCOPE_LINK)
2312 continue;
2313 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2314 if (idev->dev->flags&IFF_POINTOPOINT)
2315 continue;
2316 flag |= IFA_HOST;
2317 }
2318 if (idev->dev->flags&IFF_POINTOPOINT)
2319 plen = 64;
2320 else
2321 plen = 96;
2322
2323 add_addr(idev, &addr, plen, flag);
2324 }
2325 }
2326 }
2327}
2328#endif
2329
2330static void init_loopback(struct net_device *dev)
2331{
2332 struct inet6_dev *idev;
2333
2334 /* ::1 */
2335
2336 ASSERT_RTNL();
2337
2338 if ((idev = ipv6_find_idev(dev)) == NULL) {
2339 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2340 return;
2341 }
2342
2343 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2344}
2345
2346static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2347{
2348 struct inet6_ifaddr * ifp;
2349 u32 addr_flags = IFA_F_PERMANENT;
2350
2351#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2352 if (idev->cnf.optimistic_dad &&
2353 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2354 addr_flags |= IFA_F_OPTIMISTIC;
2355#endif
2356
2357
2358 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2359 if (!IS_ERR(ifp)) {
2360 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2361 addrconf_dad_start(ifp, 0);
2362 in6_ifa_put(ifp);
2363 }
2364}
2365
2366static void addrconf_dev_config(struct net_device *dev)
2367{
2368 struct in6_addr addr;
2369 struct inet6_dev * idev;
2370
2371 ASSERT_RTNL();
2372
2373 if ((dev->type != ARPHRD_ETHER) &&
2374 (dev->type != ARPHRD_FDDI) &&
2375 (dev->type != ARPHRD_IEEE802_TR) &&
2376 (dev->type != ARPHRD_ARCNET) &&
2377 (dev->type != ARPHRD_INFINIBAND)) {
2378 /* Alas, we support only Ethernet autoconfiguration. */
2379 return;
2380 }
2381
2382 idev = addrconf_add_dev(dev);
2383 if (idev == NULL)
2384 return;
2385
2386 memset(&addr, 0, sizeof(struct in6_addr));
2387 addr.s6_addr32[0] = htonl(0xFE800000);
2388
2389 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2390 addrconf_add_linklocal(idev, &addr);
2391}
2392
2393#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2394static void addrconf_sit_config(struct net_device *dev)
2395{
2396 struct inet6_dev *idev;
2397
2398 ASSERT_RTNL();
2399
2400 /*
2401 * Configure the tunnel with one of our IPv4
2402 * addresses... we should configure all of
2403 * our v4 addrs in the tunnel
2404 */
2405
2406 if ((idev = ipv6_find_idev(dev)) == NULL) {
2407 printk(KERN_DEBUG "init sit: add_dev failed\n");
2408 return;
2409 }
2410
2411 if (dev->priv_flags & IFF_ISATAP) {
2412 struct in6_addr addr;
2413
2414 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2415 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2416 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2417 addrconf_add_linklocal(idev, &addr);
2418 return;
2419 }
2420
2421 sit_add_v4_addrs(idev);
2422
2423 if (dev->flags&IFF_POINTOPOINT) {
2424 addrconf_add_mroute(dev);
2425 addrconf_add_lroute(dev);
2426 } else
2427 sit_route_add(dev);
2428}
2429#endif
2430
2431static inline int
2432ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2433{
2434 struct in6_addr lladdr;
2435
2436 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2437 addrconf_add_linklocal(idev, &lladdr);
2438 return 0;
2439 }
2440 return -1;
2441}
2442
2443static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2444{
2445 struct net_device *link_dev;
2446 struct net *net = dev_net(idev->dev);
2447
2448 /* first try to inherit the link-local address from the link device */
2449 if (idev->dev->iflink &&
2450 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
2451 if (!ipv6_inherit_linklocal(idev, link_dev))
2452 return;
2453 }
2454 /* then try to inherit it from any device */
2455 for_each_netdev(net, link_dev) {
2456 if (!ipv6_inherit_linklocal(idev, link_dev))
2457 return;
2458 }
2459 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2460}
2461
2462/*
2463 * Autoconfigure tunnel with a link-local address so routing protocols,
2464 * DHCPv6, MLD etc. can be run over the virtual link
2465 */
2466
2467static void addrconf_ip6_tnl_config(struct net_device *dev)
2468{
2469 struct inet6_dev *idev;
2470
2471 ASSERT_RTNL();
2472
2473 idev = addrconf_add_dev(dev);
2474 if (!idev) {
2475 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2476 return;
2477 }
2478 ip6_tnl_add_linklocal(idev);
2479}
2480
2481static int addrconf_notify(struct notifier_block *this, unsigned long event,
2482 void * data)
2483{
2484 struct net_device *dev = (struct net_device *) data;
2485 struct inet6_dev *idev = __in6_dev_get(dev);
2486 int run_pending = 0;
2487 int err;
2488
2489 switch (event) {
2490 case NETDEV_REGISTER:
2491 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2492 idev = ipv6_add_dev(dev);
2493 if (!idev)
2494 return notifier_from_errno(-ENOMEM);
2495 }
2496 break;
2497
2498 case NETDEV_UP:
2499 case NETDEV_CHANGE:
2500 if (dev->flags & IFF_SLAVE)
2501 break;
2502
2503 if (event == NETDEV_UP) {
2504 if (!addrconf_qdisc_ok(dev)) {
2505 /* device is not ready yet. */
2506 printk(KERN_INFO
2507 "ADDRCONF(NETDEV_UP): %s: "
2508 "link is not ready\n",
2509 dev->name);
2510 break;
2511 }
2512
2513 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2514 idev = ipv6_add_dev(dev);
2515
2516 if (idev) {
2517 idev->if_flags |= IF_READY;
2518 run_pending = 1;
2519 }
2520 } else {
2521 if (!addrconf_qdisc_ok(dev)) {
2522 /* device is still not ready. */
2523 break;
2524 }
2525
2526 if (idev) {
2527 if (idev->if_flags & IF_READY)
2528 /* device is already configured. */
2529 break;
2530 idev->if_flags |= IF_READY;
2531 }
2532
2533 printk(KERN_INFO
2534 "ADDRCONF(NETDEV_CHANGE): %s: "
2535 "link becomes ready\n",
2536 dev->name);
2537
2538 run_pending = 1;
2539 }
2540
2541 switch (dev->type) {
2542#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2543 case ARPHRD_SIT:
2544 addrconf_sit_config(dev);
2545 break;
2546#endif
2547 case ARPHRD_TUNNEL6:
2548 addrconf_ip6_tnl_config(dev);
2549 break;
2550 case ARPHRD_LOOPBACK:
2551 init_loopback(dev);
2552 break;
2553
2554 default:
2555 addrconf_dev_config(dev);
2556 break;
2557 }
2558
2559 if (idev) {
2560 if (run_pending)
2561 addrconf_dad_run(idev);
2562
2563 /*
2564 * If the MTU changed during the interface down,
2565 * when the interface up, the changed MTU must be
2566 * reflected in the idev as well as routers.
2567 */
2568 if (idev->cnf.mtu6 != dev->mtu &&
2569 dev->mtu >= IPV6_MIN_MTU) {
2570 rt6_mtu_change(dev, dev->mtu);
2571 idev->cnf.mtu6 = dev->mtu;
2572 }
2573 idev->tstamp = jiffies;
2574 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2575
2576 /*
2577 * If the changed mtu during down is lower than
2578 * IPV6_MIN_MTU stop IPv6 on this interface.
2579 */
2580 if (dev->mtu < IPV6_MIN_MTU)
2581 addrconf_ifdown(dev, 1);
2582 }
2583 break;
2584
2585 case NETDEV_CHANGEMTU:
2586 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2587 rt6_mtu_change(dev, dev->mtu);
2588 idev->cnf.mtu6 = dev->mtu;
2589 break;
2590 }
2591
2592 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2593 idev = ipv6_add_dev(dev);
2594 if (idev)
2595 break;
2596 }
2597
2598 /*
2599 * MTU falled under IPV6_MIN_MTU.
2600 * Stop IPv6 on this interface.
2601 */
2602
2603 case NETDEV_DOWN:
2604 case NETDEV_UNREGISTER:
2605 /*
2606 * Remove all addresses from this interface.
2607 */
2608 addrconf_ifdown(dev, event != NETDEV_DOWN);
2609 break;
2610
2611 case NETDEV_CHANGENAME:
2612 if (idev) {
2613 snmp6_unregister_dev(idev);
2614 addrconf_sysctl_unregister(idev);
2615 addrconf_sysctl_register(idev);
2616 err = snmp6_register_dev(idev);
2617 if (err)
2618 return notifier_from_errno(err);
2619 }
2620 break;
2621
2622 case NETDEV_PRE_TYPE_CHANGE:
2623 case NETDEV_POST_TYPE_CHANGE:
2624 addrconf_type_change(dev, event);
2625 break;
2626 }
2627
2628 return NOTIFY_OK;
2629}
2630
2631/*
2632 * addrconf module should be notified of a device going up
2633 */
2634static struct notifier_block ipv6_dev_notf = {
2635 .notifier_call = addrconf_notify,
2636};
2637
2638static void addrconf_type_change(struct net_device *dev, unsigned long event)
2639{
2640 struct inet6_dev *idev;
2641 ASSERT_RTNL();
2642
2643 idev = __in6_dev_get(dev);
2644
2645 if (event == NETDEV_POST_TYPE_CHANGE)
2646 ipv6_mc_remap(idev);
2647 else if (event == NETDEV_PRE_TYPE_CHANGE)
2648 ipv6_mc_unmap(idev);
2649}
2650
2651static int addrconf_ifdown(struct net_device *dev, int how)
2652{
2653 struct net *net = dev_net(dev);
2654 struct inet6_dev *idev;
2655 struct inet6_ifaddr *ifa;
2656 LIST_HEAD(keep_list);
2657 int state;
2658
2659 ASSERT_RTNL();
2660
2661 rt6_ifdown(net, dev);
2662 neigh_ifdown(&nd_tbl, dev);
2663
2664 idev = __in6_dev_get(dev);
2665 if (idev == NULL)
2666 return -ENODEV;
2667
2668 /*
2669 * Step 1: remove reference to ipv6 device from parent device.
2670 * Do not dev_put!
2671 */
2672 if (how) {
2673 idev->dead = 1;
2674
2675 /* protected by rtnl_lock */
2676 rcu_assign_pointer(dev->ip6_ptr, NULL);
2677
2678 /* Step 1.5: remove snmp6 entry */
2679 snmp6_unregister_dev(idev);
2680
2681 }
2682
2683 write_lock_bh(&idev->lock);
2684
2685 /* Step 2: clear flags for stateless addrconf */
2686 if (!how)
2687 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2688
2689#ifdef CONFIG_IPV6_PRIVACY
2690 if (how && del_timer(&idev->regen_timer))
2691 in6_dev_put(idev);
2692
2693 /* Step 3: clear tempaddr list */
2694 while (!list_empty(&idev->tempaddr_list)) {
2695 ifa = list_first_entry(&idev->tempaddr_list,
2696 struct inet6_ifaddr, tmp_list);
2697 list_del(&ifa->tmp_list);
2698 write_unlock_bh(&idev->lock);
2699 spin_lock_bh(&ifa->lock);
2700
2701 if (ifa->ifpub) {
2702 in6_ifa_put(ifa->ifpub);
2703 ifa->ifpub = NULL;
2704 }
2705 spin_unlock_bh(&ifa->lock);
2706 in6_ifa_put(ifa);
2707 write_lock_bh(&idev->lock);
2708 }
2709#endif
2710
2711 while (!list_empty(&idev->addr_list)) {
2712 ifa = list_first_entry(&idev->addr_list,
2713 struct inet6_ifaddr, if_list);
2714 addrconf_del_timer(ifa);
2715
2716 /* If just doing link down, and address is permanent
2717 and not link-local, then retain it. */
2718 if (!how &&
2719 (ifa->flags&IFA_F_PERMANENT) &&
2720 !(ipv6_addr_type(&ifa->addr) & IPV6_ADDR_LINKLOCAL)) {
2721 list_move_tail(&ifa->if_list, &keep_list);
2722
2723 /* If not doing DAD on this address, just keep it. */
2724 if ((dev->flags&(IFF_NOARP|IFF_LOOPBACK)) ||
2725 idev->cnf.accept_dad <= 0 ||
2726 (ifa->flags & IFA_F_NODAD))
2727 continue;
2728
2729 /* If it was tentative already, no need to notify */
2730 if (ifa->flags & IFA_F_TENTATIVE)
2731 continue;
2732
2733 /* Flag it for later restoration when link comes up */
2734 ifa->flags |= IFA_F_TENTATIVE;
2735 ifa->state = INET6_IFADDR_STATE_DAD;
2736
2737 write_unlock_bh(&idev->lock);
2738
2739 in6_ifa_hold(ifa);
2740 } else {
2741 list_del(&ifa->if_list);
2742
2743 /* clear hash table */
2744 spin_lock_bh(&addrconf_hash_lock);
2745 hlist_del_init_rcu(&ifa->addr_lst);
2746 spin_unlock_bh(&addrconf_hash_lock);
2747
2748 write_unlock_bh(&idev->lock);
2749 spin_lock_bh(&ifa->state_lock);
2750 state = ifa->state;
2751 ifa->state = INET6_IFADDR_STATE_DEAD;
2752 spin_unlock_bh(&ifa->state_lock);
2753
2754 if (state == INET6_IFADDR_STATE_DEAD)
2755 goto put_ifa;
2756 }
2757
2758 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2759 if (ifa->state == INET6_IFADDR_STATE_DEAD)
2760 atomic_notifier_call_chain(&inet6addr_chain,
2761 NETDEV_DOWN, ifa);
2762
2763put_ifa:
2764 in6_ifa_put(ifa);
2765
2766 write_lock_bh(&idev->lock);
2767 }
2768
2769 list_splice(&keep_list, &idev->addr_list);
2770
2771 write_unlock_bh(&idev->lock);
2772
2773 /* Step 5: Discard multicast list */
2774 if (how)
2775 ipv6_mc_destroy_dev(idev);
2776 else
2777 ipv6_mc_down(idev);
2778
2779 idev->tstamp = jiffies;
2780
2781 /* Last: Shot the device (if unregistered) */
2782 if (how) {
2783 addrconf_sysctl_unregister(idev);
2784 neigh_parms_release(&nd_tbl, idev->nd_parms);
2785 neigh_ifdown(&nd_tbl, dev);
2786 in6_dev_put(idev);
2787 }
2788 return 0;
2789}
2790
2791static void addrconf_rs_timer(unsigned long data)
2792{
2793 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2794 struct inet6_dev *idev = ifp->idev;
2795
2796 read_lock(&idev->lock);
2797 if (idev->dead || !(idev->if_flags & IF_READY))
2798 goto out;
2799
2800 if (idev->cnf.forwarding)
2801 goto out;
2802
2803 /* Announcement received after solicitation was sent */
2804 if (idev->if_flags & IF_RA_RCVD)
2805 goto out;
2806
2807 spin_lock(&ifp->lock);
2808 if (ifp->probes++ < idev->cnf.rtr_solicits) {
2809 /* The wait after the last probe can be shorter */
2810 addrconf_mod_timer(ifp, AC_RS,
2811 (ifp->probes == idev->cnf.rtr_solicits) ?
2812 idev->cnf.rtr_solicit_delay :
2813 idev->cnf.rtr_solicit_interval);
2814 spin_unlock(&ifp->lock);
2815
2816 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2817 } else {
2818 spin_unlock(&ifp->lock);
2819 /*
2820 * Note: we do not support deprecated "all on-link"
2821 * assumption any longer.
2822 */
2823 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2824 idev->dev->name);
2825 }
2826
2827out:
2828 read_unlock(&idev->lock);
2829 in6_ifa_put(ifp);
2830}
2831
2832/*
2833 * Duplicate Address Detection
2834 */
2835static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2836{
2837 unsigned long rand_num;
2838 struct inet6_dev *idev = ifp->idev;
2839
2840 if (ifp->flags & IFA_F_OPTIMISTIC)
2841 rand_num = 0;
2842 else
2843 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2844
2845 ifp->probes = idev->cnf.dad_transmits;
2846 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2847}
2848
2849static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2850{
2851 struct inet6_dev *idev = ifp->idev;
2852 struct net_device *dev = idev->dev;
2853
2854 addrconf_join_solict(dev, &ifp->addr);
2855
2856 net_srandom(ifp->addr.s6_addr32[3]);
2857
2858 read_lock_bh(&idev->lock);
2859 spin_lock(&ifp->lock);
2860 if (ifp->state == INET6_IFADDR_STATE_DEAD)
2861 goto out;
2862
2863 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2864 idev->cnf.accept_dad < 1 ||
2865 !(ifp->flags&IFA_F_TENTATIVE) ||
2866 ifp->flags & IFA_F_NODAD) {
2867 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
2868 spin_unlock(&ifp->lock);
2869 read_unlock_bh(&idev->lock);
2870
2871 addrconf_dad_completed(ifp);
2872 return;
2873 }
2874
2875 if (!(idev->if_flags & IF_READY)) {
2876 spin_unlock(&ifp->lock);
2877 read_unlock_bh(&idev->lock);
2878 /*
2879 * If the device is not ready:
2880 * - keep it tentative if it is a permanent address.
2881 * - otherwise, kill it.
2882 */
2883 in6_ifa_hold(ifp);
2884 addrconf_dad_stop(ifp, 0);
2885 return;
2886 }
2887
2888 /*
2889 * Optimistic nodes can start receiving
2890 * Frames right away
2891 */
2892 if (ifp->flags & IFA_F_OPTIMISTIC)
2893 ip6_ins_rt(ifp->rt);
2894
2895 addrconf_dad_kick(ifp);
2896out:
2897 spin_unlock(&ifp->lock);
2898 read_unlock_bh(&idev->lock);
2899}
2900
2901static void addrconf_dad_timer(unsigned long data)
2902{
2903 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2904 struct inet6_dev *idev = ifp->idev;
2905 struct in6_addr mcaddr;
2906
2907 if (!ifp->probes && addrconf_dad_end(ifp))
2908 goto out;
2909
2910 read_lock(&idev->lock);
2911 if (idev->dead || !(idev->if_flags & IF_READY)) {
2912 read_unlock(&idev->lock);
2913 goto out;
2914 }
2915
2916 spin_lock(&ifp->lock);
2917 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
2918 spin_unlock(&ifp->lock);
2919 read_unlock(&idev->lock);
2920 goto out;
2921 }
2922
2923 if (ifp->probes == 0) {
2924 /*
2925 * DAD was successful
2926 */
2927
2928 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
2929 spin_unlock(&ifp->lock);
2930 read_unlock(&idev->lock);
2931
2932 addrconf_dad_completed(ifp);
2933
2934 goto out;
2935 }
2936
2937 ifp->probes--;
2938 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2939 spin_unlock(&ifp->lock);
2940 read_unlock(&idev->lock);
2941
2942 /* send a neighbour solicitation for our addr */
2943 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2944 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
2945out:
2946 in6_ifa_put(ifp);
2947}
2948
2949static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2950{
2951 struct net_device *dev = ifp->idev->dev;
2952
2953 /*
2954 * Configure the address for reception. Now it is valid.
2955 */
2956
2957 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2958
2959 /* If added prefix is link local and forwarding is off,
2960 start sending router solicitations.
2961 */
2962
2963 if (ifp->idev->cnf.forwarding == 0 &&
2964 ifp->idev->cnf.rtr_solicits > 0 &&
2965 (dev->flags&IFF_LOOPBACK) == 0 &&
2966 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2967 /*
2968 * If a host as already performed a random delay
2969 * [...] as part of DAD [...] there is no need
2970 * to delay again before sending the first RS
2971 */
2972 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2973
2974 spin_lock_bh(&ifp->lock);
2975 ifp->probes = 1;
2976 ifp->idev->if_flags |= IF_RS_SENT;
2977 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2978 spin_unlock_bh(&ifp->lock);
2979 }
2980}
2981
2982static void addrconf_dad_run(struct inet6_dev *idev)
2983{
2984 struct inet6_ifaddr *ifp;
2985
2986 read_lock_bh(&idev->lock);
2987 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2988 spin_lock(&ifp->lock);
2989 if (ifp->flags & IFA_F_TENTATIVE &&
2990 ifp->state == INET6_IFADDR_STATE_DAD)
2991 addrconf_dad_kick(ifp);
2992 spin_unlock(&ifp->lock);
2993 }
2994 read_unlock_bh(&idev->lock);
2995}
2996
2997#ifdef CONFIG_PROC_FS
2998struct if6_iter_state {
2999 struct seq_net_private p;
3000 int bucket;
3001};
3002
3003static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
3004{
3005 struct inet6_ifaddr *ifa = NULL;
3006 struct if6_iter_state *state = seq->private;
3007 struct net *net = seq_file_net(seq);
3008
3009 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3010 struct hlist_node *n;
3011 hlist_for_each_entry_rcu_bh(ifa, n, &inet6_addr_lst[state->bucket],
3012 addr_lst)
3013 if (net_eq(dev_net(ifa->idev->dev), net))
3014 return ifa;
3015 }
3016 return NULL;
3017}
3018
3019static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3020 struct inet6_ifaddr *ifa)
3021{
3022 struct if6_iter_state *state = seq->private;
3023 struct net *net = seq_file_net(seq);
3024 struct hlist_node *n = &ifa->addr_lst;
3025
3026 hlist_for_each_entry_continue_rcu_bh(ifa, n, addr_lst)
3027 if (net_eq(dev_net(ifa->idev->dev), net))
3028 return ifa;
3029
3030 while (++state->bucket < IN6_ADDR_HSIZE) {
3031 hlist_for_each_entry_rcu_bh(ifa, n,
3032 &inet6_addr_lst[state->bucket], addr_lst) {
3033 if (net_eq(dev_net(ifa->idev->dev), net))
3034 return ifa;
3035 }
3036 }
3037
3038 return NULL;
3039}
3040
3041static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
3042{
3043 struct inet6_ifaddr *ifa = if6_get_first(seq);
3044
3045 if (ifa)
3046 while (pos && (ifa = if6_get_next(seq, ifa)) != NULL)
3047 --pos;
3048 return pos ? NULL : ifa;
3049}
3050
3051static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3052 __acquires(rcu_bh)
3053{
3054 rcu_read_lock_bh();
3055 return if6_get_idx(seq, *pos);
3056}
3057
3058static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3059{
3060 struct inet6_ifaddr *ifa;
3061
3062 ifa = if6_get_next(seq, v);
3063 ++*pos;
3064 return ifa;
3065}
3066
3067static void if6_seq_stop(struct seq_file *seq, void *v)
3068 __releases(rcu_bh)
3069{
3070 rcu_read_unlock_bh();
3071}
3072
3073static int if6_seq_show(struct seq_file *seq, void *v)
3074{
3075 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3076 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3077 &ifp->addr,
3078 ifp->idev->dev->ifindex,
3079 ifp->prefix_len,
3080 ifp->scope,
3081 ifp->flags,
3082 ifp->idev->dev->name);
3083 return 0;
3084}
3085
3086static const struct seq_operations if6_seq_ops = {
3087 .start = if6_seq_start,
3088 .next = if6_seq_next,
3089 .show = if6_seq_show,
3090 .stop = if6_seq_stop,
3091};
3092
3093static int if6_seq_open(struct inode *inode, struct file *file)
3094{
3095 return seq_open_net(inode, file, &if6_seq_ops,
3096 sizeof(struct if6_iter_state));
3097}
3098
3099static const struct file_operations if6_fops = {
3100 .owner = THIS_MODULE,
3101 .open = if6_seq_open,
3102 .read = seq_read,
3103 .llseek = seq_lseek,
3104 .release = seq_release_net,
3105};
3106
3107static int __net_init if6_proc_net_init(struct net *net)
3108{
3109 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
3110 return -ENOMEM;
3111 return 0;
3112}
3113
3114static void __net_exit if6_proc_net_exit(struct net *net)
3115{
3116 proc_net_remove(net, "if_inet6");
3117}
3118
3119static struct pernet_operations if6_proc_net_ops = {
3120 .init = if6_proc_net_init,
3121 .exit = if6_proc_net_exit,
3122};
3123
3124int __init if6_proc_init(void)
3125{
3126 return register_pernet_subsys(&if6_proc_net_ops);
3127}
3128
3129void if6_proc_exit(void)
3130{
3131 unregister_pernet_subsys(&if6_proc_net_ops);
3132}
3133#endif /* CONFIG_PROC_FS */
3134
3135#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3136/* Check if address is a home address configured on any interface. */
3137int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr)
3138{
3139 int ret = 0;
3140 struct inet6_ifaddr *ifp = NULL;
3141 struct hlist_node *n;
3142 unsigned int hash = ipv6_addr_hash(addr);
3143
3144 rcu_read_lock_bh();
3145 hlist_for_each_entry_rcu_bh(ifp, n, &inet6_addr_lst[hash], addr_lst) {
3146 if (!net_eq(dev_net(ifp->idev->dev), net))
3147 continue;
3148 if (ipv6_addr_equal(&ifp->addr, addr) &&
3149 (ifp->flags & IFA_F_HOMEADDRESS)) {
3150 ret = 1;
3151 break;
3152 }
3153 }
3154 rcu_read_unlock_bh();
3155 return ret;
3156}
3157#endif
3158
3159/*
3160 * Periodic address status verification
3161 */
3162
3163static void addrconf_verify(unsigned long foo)
3164{
3165 unsigned long now, next, next_sec, next_sched;
3166 struct inet6_ifaddr *ifp;
3167 struct hlist_node *node;
3168 int i;
3169
3170 rcu_read_lock_bh();
3171 spin_lock(&addrconf_verify_lock);
3172 now = jiffies;
3173 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3174
3175 del_timer(&addr_chk_timer);
3176
3177 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3178restart:
3179 hlist_for_each_entry_rcu_bh(ifp, node,
3180 &inet6_addr_lst[i], addr_lst) {
3181 unsigned long age;
3182
3183 if (ifp->flags & IFA_F_PERMANENT)
3184 continue;
3185
3186 spin_lock(&ifp->lock);
3187 /* We try to batch several events at once. */
3188 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3189
3190 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3191 age >= ifp->valid_lft) {
3192 spin_unlock(&ifp->lock);
3193 in6_ifa_hold(ifp);
3194 ipv6_del_addr(ifp);
3195 goto restart;
3196 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3197 spin_unlock(&ifp->lock);
3198 continue;
3199 } else if (age >= ifp->prefered_lft) {
3200 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3201 int deprecate = 0;
3202
3203 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3204 deprecate = 1;
3205 ifp->flags |= IFA_F_DEPRECATED;
3206 }
3207
3208 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3209 next = ifp->tstamp + ifp->valid_lft * HZ;
3210
3211 spin_unlock(&ifp->lock);
3212
3213 if (deprecate) {
3214 in6_ifa_hold(ifp);
3215
3216 ipv6_ifa_notify(0, ifp);
3217 in6_ifa_put(ifp);
3218 goto restart;
3219 }
3220#ifdef CONFIG_IPV6_PRIVACY
3221 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3222 !(ifp->flags&IFA_F_TENTATIVE)) {
3223 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3224 ifp->idev->cnf.dad_transmits *
3225 ifp->idev->nd_parms->retrans_time / HZ;
3226
3227 if (age >= ifp->prefered_lft - regen_advance) {
3228 struct inet6_ifaddr *ifpub = ifp->ifpub;
3229 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3230 next = ifp->tstamp + ifp->prefered_lft * HZ;
3231 if (!ifp->regen_count && ifpub) {
3232 ifp->regen_count++;
3233 in6_ifa_hold(ifp);
3234 in6_ifa_hold(ifpub);
3235 spin_unlock(&ifp->lock);
3236
3237 spin_lock(&ifpub->lock);
3238 ifpub->regen_count = 0;
3239 spin_unlock(&ifpub->lock);
3240 ipv6_create_tempaddr(ifpub, ifp);
3241 in6_ifa_put(ifpub);
3242 in6_ifa_put(ifp);
3243 goto restart;
3244 }
3245 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3246 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3247 spin_unlock(&ifp->lock);
3248#endif
3249 } else {
3250 /* ifp->prefered_lft <= ifp->valid_lft */
3251 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3252 next = ifp->tstamp + ifp->prefered_lft * HZ;
3253 spin_unlock(&ifp->lock);
3254 }
3255 }
3256 }
3257
3258 next_sec = round_jiffies_up(next);
3259 next_sched = next;
3260
3261 /* If rounded timeout is accurate enough, accept it. */
3262 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3263 next_sched = next_sec;
3264
3265 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3266 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3267 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3268
3269 ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3270 now, next, next_sec, next_sched));
3271
3272 addr_chk_timer.expires = next_sched;
3273 add_timer(&addr_chk_timer);
3274 spin_unlock(&addrconf_verify_lock);
3275 rcu_read_unlock_bh();
3276}
3277
3278static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3279{
3280 struct in6_addr *pfx = NULL;
3281
3282 if (addr)
3283 pfx = nla_data(addr);
3284
3285 if (local) {
3286 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3287 pfx = NULL;
3288 else
3289 pfx = nla_data(local);
3290 }
3291
3292 return pfx;
3293}
3294
3295static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3296 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3297 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3298 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3299};
3300
3301static int
3302inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3303{
3304 struct net *net = sock_net(skb->sk);
3305 struct ifaddrmsg *ifm;
3306 struct nlattr *tb[IFA_MAX+1];
3307 struct in6_addr *pfx;
3308 int err;
3309
3310 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3311 if (err < 0)
3312 return err;
3313
3314 ifm = nlmsg_data(nlh);
3315 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3316 if (pfx == NULL)
3317 return -EINVAL;
3318
3319 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3320}
3321
3322static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3323 u32 prefered_lft, u32 valid_lft)
3324{
3325 u32 flags;
3326 clock_t expires;
3327 unsigned long timeout;
3328
3329 if (!valid_lft || (prefered_lft > valid_lft))
3330 return -EINVAL;
3331
3332 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3333 if (addrconf_finite_timeout(timeout)) {
3334 expires = jiffies_to_clock_t(timeout * HZ);
3335 valid_lft = timeout;
3336 flags = RTF_EXPIRES;
3337 } else {
3338 expires = 0;
3339 flags = 0;
3340 ifa_flags |= IFA_F_PERMANENT;
3341 }
3342
3343 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3344 if (addrconf_finite_timeout(timeout)) {
3345 if (timeout == 0)
3346 ifa_flags |= IFA_F_DEPRECATED;
3347 prefered_lft = timeout;
3348 }
3349
3350 spin_lock_bh(&ifp->lock);
3351 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3352 ifp->tstamp = jiffies;
3353 ifp->valid_lft = valid_lft;
3354 ifp->prefered_lft = prefered_lft;
3355
3356 spin_unlock_bh(&ifp->lock);
3357 if (!(ifp->flags&IFA_F_TENTATIVE))
3358 ipv6_ifa_notify(0, ifp);
3359
3360 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3361 expires, flags);
3362 addrconf_verify(0);
3363
3364 return 0;
3365}
3366
3367static int
3368inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3369{
3370 struct net *net = sock_net(skb->sk);
3371 struct ifaddrmsg *ifm;
3372 struct nlattr *tb[IFA_MAX+1];
3373 struct in6_addr *pfx;
3374 struct inet6_ifaddr *ifa;
3375 struct net_device *dev;
3376 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3377 u8 ifa_flags;
3378 int err;
3379
3380 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3381 if (err < 0)
3382 return err;
3383
3384 ifm = nlmsg_data(nlh);
3385 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3386 if (pfx == NULL)
3387 return -EINVAL;
3388
3389 if (tb[IFA_CACHEINFO]) {
3390 struct ifa_cacheinfo *ci;
3391
3392 ci = nla_data(tb[IFA_CACHEINFO]);
3393 valid_lft = ci->ifa_valid;
3394 preferred_lft = ci->ifa_prefered;
3395 } else {
3396 preferred_lft = INFINITY_LIFE_TIME;
3397 valid_lft = INFINITY_LIFE_TIME;
3398 }
3399
3400 dev = __dev_get_by_index(net, ifm->ifa_index);
3401 if (dev == NULL)
3402 return -ENODEV;
3403
3404 /* We ignore other flags so far. */
3405 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3406
3407 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3408 if (ifa == NULL) {
3409 /*
3410 * It would be best to check for !NLM_F_CREATE here but
3411 * userspace alreay relies on not having to provide this.
3412 */
3413 return inet6_addr_add(net, ifm->ifa_index, pfx,
3414 ifm->ifa_prefixlen, ifa_flags,
3415 preferred_lft, valid_lft);
3416 }
3417
3418 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3419 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3420 err = -EEXIST;
3421 else
3422 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3423
3424 in6_ifa_put(ifa);
3425
3426 return err;
3427}
3428
3429static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3430 u8 scope, int ifindex)
3431{
3432 struct ifaddrmsg *ifm;
3433
3434 ifm = nlmsg_data(nlh);
3435 ifm->ifa_family = AF_INET6;
3436 ifm->ifa_prefixlen = prefixlen;
3437 ifm->ifa_flags = flags;
3438 ifm->ifa_scope = scope;
3439 ifm->ifa_index = ifindex;
3440}
3441
3442static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3443 unsigned long tstamp, u32 preferred, u32 valid)
3444{
3445 struct ifa_cacheinfo ci;
3446
3447 ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3448 + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3449 ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3450 + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3451 ci.ifa_prefered = preferred;
3452 ci.ifa_valid = valid;
3453
3454 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3455}
3456
3457static inline int rt_scope(int ifa_scope)
3458{
3459 if (ifa_scope & IFA_HOST)
3460 return RT_SCOPE_HOST;
3461 else if (ifa_scope & IFA_LINK)
3462 return RT_SCOPE_LINK;
3463 else if (ifa_scope & IFA_SITE)
3464 return RT_SCOPE_SITE;
3465 else
3466 return RT_SCOPE_UNIVERSE;
3467}
3468
3469static inline int inet6_ifaddr_msgsize(void)
3470{
3471 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3472 + nla_total_size(16) /* IFA_ADDRESS */
3473 + nla_total_size(sizeof(struct ifa_cacheinfo));
3474}
3475
3476static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3477 u32 pid, u32 seq, int event, unsigned int flags)
3478{
3479 struct nlmsghdr *nlh;
3480 u32 preferred, valid;
3481
3482 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3483 if (nlh == NULL)
3484 return -EMSGSIZE;
3485
3486 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3487 ifa->idev->dev->ifindex);
3488
3489 if (!(ifa->flags&IFA_F_PERMANENT)) {
3490 preferred = ifa->prefered_lft;
3491 valid = ifa->valid_lft;
3492 if (preferred != INFINITY_LIFE_TIME) {
3493 long tval = (jiffies - ifa->tstamp)/HZ;
3494 if (preferred > tval)
3495 preferred -= tval;
3496 else
3497 preferred = 0;
3498 if (valid != INFINITY_LIFE_TIME) {
3499 if (valid > tval)
3500 valid -= tval;
3501 else
3502 valid = 0;
3503 }
3504 }
3505 } else {
3506 preferred = INFINITY_LIFE_TIME;
3507 valid = INFINITY_LIFE_TIME;
3508 }
3509
3510 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3511 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3512 nlmsg_cancel(skb, nlh);
3513 return -EMSGSIZE;
3514 }
3515
3516 return nlmsg_end(skb, nlh);
3517}
3518
3519static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3520 u32 pid, u32 seq, int event, u16 flags)
3521{
3522 struct nlmsghdr *nlh;
3523 u8 scope = RT_SCOPE_UNIVERSE;
3524 int ifindex = ifmca->idev->dev->ifindex;
3525
3526 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3527 scope = RT_SCOPE_SITE;
3528
3529 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3530 if (nlh == NULL)
3531 return -EMSGSIZE;
3532
3533 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3534 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3535 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3536 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3537 nlmsg_cancel(skb, nlh);
3538 return -EMSGSIZE;
3539 }
3540
3541 return nlmsg_end(skb, nlh);
3542}
3543
3544static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3545 u32 pid, u32 seq, int event, unsigned int flags)
3546{
3547 struct nlmsghdr *nlh;
3548 u8 scope = RT_SCOPE_UNIVERSE;
3549 int ifindex = ifaca->aca_idev->dev->ifindex;
3550
3551 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3552 scope = RT_SCOPE_SITE;
3553
3554 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3555 if (nlh == NULL)
3556 return -EMSGSIZE;
3557
3558 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3559 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3560 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3561 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3562 nlmsg_cancel(skb, nlh);
3563 return -EMSGSIZE;
3564 }
3565
3566 return nlmsg_end(skb, nlh);
3567}
3568
3569enum addr_type_t {
3570 UNICAST_ADDR,
3571 MULTICAST_ADDR,
3572 ANYCAST_ADDR,
3573};
3574
3575/* called with rcu_read_lock() */
3576static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3577 struct netlink_callback *cb, enum addr_type_t type,
3578 int s_ip_idx, int *p_ip_idx)
3579{
3580 struct ifmcaddr6 *ifmca;
3581 struct ifacaddr6 *ifaca;
3582 int err = 1;
3583 int ip_idx = *p_ip_idx;
3584
3585 read_lock_bh(&idev->lock);
3586 switch (type) {
3587 case UNICAST_ADDR: {
3588 struct inet6_ifaddr *ifa;
3589
3590 /* unicast address incl. temp addr */
3591 list_for_each_entry(ifa, &idev->addr_list, if_list) {
3592 if (++ip_idx < s_ip_idx)
3593 continue;
3594 err = inet6_fill_ifaddr(skb, ifa,
3595 NETLINK_CB(cb->skb).pid,
3596 cb->nlh->nlmsg_seq,
3597 RTM_NEWADDR,
3598 NLM_F_MULTI);
3599 if (err <= 0)
3600 break;
3601 }
3602 break;
3603 }
3604 case MULTICAST_ADDR:
3605 /* multicast address */
3606 for (ifmca = idev->mc_list; ifmca;
3607 ifmca = ifmca->next, ip_idx++) {
3608 if (ip_idx < s_ip_idx)
3609 continue;
3610 err = inet6_fill_ifmcaddr(skb, ifmca,
3611 NETLINK_CB(cb->skb).pid,
3612 cb->nlh->nlmsg_seq,
3613 RTM_GETMULTICAST,
3614 NLM_F_MULTI);
3615 if (err <= 0)
3616 break;
3617 }
3618 break;
3619 case ANYCAST_ADDR:
3620 /* anycast address */
3621 for (ifaca = idev->ac_list; ifaca;
3622 ifaca = ifaca->aca_next, ip_idx++) {
3623 if (ip_idx < s_ip_idx)
3624 continue;
3625 err = inet6_fill_ifacaddr(skb, ifaca,
3626 NETLINK_CB(cb->skb).pid,
3627 cb->nlh->nlmsg_seq,
3628 RTM_GETANYCAST,
3629 NLM_F_MULTI);
3630 if (err <= 0)
3631 break;
3632 }
3633 break;
3634 default:
3635 break;
3636 }
3637 read_unlock_bh(&idev->lock);
3638 *p_ip_idx = ip_idx;
3639 return err;
3640}
3641
3642static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3643 enum addr_type_t type)
3644{
3645 struct net *net = sock_net(skb->sk);
3646 int h, s_h;
3647 int idx, ip_idx;
3648 int s_idx, s_ip_idx;
3649 struct net_device *dev;
3650 struct inet6_dev *idev;
3651 struct hlist_head *head;
3652 struct hlist_node *node;
3653
3654 s_h = cb->args[0];
3655 s_idx = idx = cb->args[1];
3656 s_ip_idx = ip_idx = cb->args[2];
3657
3658 rcu_read_lock();
3659 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3660 idx = 0;
3661 head = &net->dev_index_head[h];
3662 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3663 if (idx < s_idx)
3664 goto cont;
3665 if (h > s_h || idx > s_idx)
3666 s_ip_idx = 0;
3667 ip_idx = 0;
3668 idev = __in6_dev_get(dev);
3669 if (!idev)
3670 goto cont;
3671
3672 if (in6_dump_addrs(idev, skb, cb, type,
3673 s_ip_idx, &ip_idx) <= 0)
3674 goto done;
3675cont:
3676 idx++;
3677 }
3678 }
3679done:
3680 rcu_read_unlock();
3681 cb->args[0] = h;
3682 cb->args[1] = idx;
3683 cb->args[2] = ip_idx;
3684
3685 return skb->len;
3686}
3687
3688static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3689{
3690 enum addr_type_t type = UNICAST_ADDR;
3691
3692 return inet6_dump_addr(skb, cb, type);
3693}
3694
3695static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3696{
3697 enum addr_type_t type = MULTICAST_ADDR;
3698
3699 return inet6_dump_addr(skb, cb, type);
3700}
3701
3702
3703static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3704{
3705 enum addr_type_t type = ANYCAST_ADDR;
3706
3707 return inet6_dump_addr(skb, cb, type);
3708}
3709
3710static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3711 void *arg)
3712{
3713 struct net *net = sock_net(in_skb->sk);
3714 struct ifaddrmsg *ifm;
3715 struct nlattr *tb[IFA_MAX+1];
3716 struct in6_addr *addr = NULL;
3717 struct net_device *dev = NULL;
3718 struct inet6_ifaddr *ifa;
3719 struct sk_buff *skb;
3720 int err;
3721
3722 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3723 if (err < 0)
3724 goto errout;
3725
3726 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3727 if (addr == NULL) {
3728 err = -EINVAL;
3729 goto errout;
3730 }
3731
3732 ifm = nlmsg_data(nlh);
3733 if (ifm->ifa_index)
3734 dev = __dev_get_by_index(net, ifm->ifa_index);
3735
3736 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
3737 if (!ifa) {
3738 err = -EADDRNOTAVAIL;
3739 goto errout;
3740 }
3741
3742 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
3743 if (!skb) {
3744 err = -ENOBUFS;
3745 goto errout_ifa;
3746 }
3747
3748 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3749 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3750 if (err < 0) {
3751 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3752 WARN_ON(err == -EMSGSIZE);
3753 kfree_skb(skb);
3754 goto errout_ifa;
3755 }
3756 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
3757errout_ifa:
3758 in6_ifa_put(ifa);
3759errout:
3760 return err;
3761}
3762
3763static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3764{
3765 struct sk_buff *skb;
3766 struct net *net = dev_net(ifa->idev->dev);
3767 int err = -ENOBUFS;
3768
3769 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3770 if (skb == NULL)
3771 goto errout;
3772
3773 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3774 if (err < 0) {
3775 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3776 WARN_ON(err == -EMSGSIZE);
3777 kfree_skb(skb);
3778 goto errout;
3779 }
3780 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3781 return;
3782errout:
3783 if (err < 0)
3784 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3785}
3786
3787static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3788 __s32 *array, int bytes)
3789{
3790 BUG_ON(bytes < (DEVCONF_MAX * 4));
3791
3792 memset(array, 0, bytes);
3793 array[DEVCONF_FORWARDING] = cnf->forwarding;
3794 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3795 array[DEVCONF_MTU6] = cnf->mtu6;
3796 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3797 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3798 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3799 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3800 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3801 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3802 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3803 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3804#ifdef CONFIG_IPV6_PRIVACY
3805 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3806 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3807 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3808 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3809 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3810#endif
3811 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3812 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3813 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3814#ifdef CONFIG_IPV6_ROUTER_PREF
3815 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3816 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
3817#ifdef CONFIG_IPV6_ROUTE_INFO
3818 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3819#endif
3820#endif
3821 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3822 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3823#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3824 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3825#endif
3826#ifdef CONFIG_IPV6_MROUTE
3827 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
3828#endif
3829 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
3830 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
3831 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
3832}
3833
3834static inline size_t inet6_if_nlmsg_size(void)
3835{
3836 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3837 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3838 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3839 + nla_total_size(4) /* IFLA_MTU */
3840 + nla_total_size(4) /* IFLA_LINK */
3841 + nla_total_size( /* IFLA_PROTINFO */
3842 nla_total_size(4) /* IFLA_INET6_FLAGS */
3843 + nla_total_size(sizeof(struct ifla_cacheinfo))
3844 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3845 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3846 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
3847 );
3848}
3849
3850static inline void __snmp6_fill_stats(u64 *stats, void __percpu **mib,
3851 int items, int bytes)
3852{
3853 int i;
3854 int pad = bytes - sizeof(u64) * items;
3855 BUG_ON(pad < 0);
3856
3857 /* Use put_unaligned() because stats may not be aligned for u64. */
3858 put_unaligned(items, &stats[0]);
3859 for (i = 1; i < items; i++)
3860 put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3861
3862 memset(&stats[items], 0, pad);
3863}
3864
3865static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3866 int bytes)
3867{
3868 switch (attrtype) {
3869 case IFLA_INET6_STATS:
3870 __snmp6_fill_stats(stats, (void __percpu **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes);
3871 break;
3872 case IFLA_INET6_ICMP6STATS:
3873 __snmp6_fill_stats(stats, (void __percpu **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
3874 break;
3875 }
3876}
3877
3878static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3879 u32 pid, u32 seq, int event, unsigned int flags)
3880{
3881 struct net_device *dev = idev->dev;
3882 struct nlattr *nla;
3883 struct ifinfomsg *hdr;
3884 struct nlmsghdr *nlh;
3885 void *protoinfo;
3886 struct ifla_cacheinfo ci;
3887
3888 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3889 if (nlh == NULL)
3890 return -EMSGSIZE;
3891
3892 hdr = nlmsg_data(nlh);
3893 hdr->ifi_family = AF_INET6;
3894 hdr->__ifi_pad = 0;
3895 hdr->ifi_type = dev->type;
3896 hdr->ifi_index = dev->ifindex;
3897 hdr->ifi_flags = dev_get_flags(dev);
3898 hdr->ifi_change = 0;
3899
3900 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
3901
3902 if (dev->addr_len)
3903 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3904
3905 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
3906 if (dev->ifindex != dev->iflink)
3907 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
3908
3909 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3910 if (protoinfo == NULL)
3911 goto nla_put_failure;
3912
3913 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
3914
3915 ci.max_reasm_len = IPV6_MAXPLEN;
3916 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3917 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3918 ci.reachable_time = idev->nd_parms->reachable_time;
3919 ci.retrans_time = idev->nd_parms->retrans_time;
3920 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3921
3922 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3923 if (nla == NULL)
3924 goto nla_put_failure;
3925 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
3926
3927 /* XXX - MC not implemented */
3928
3929 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3930 if (nla == NULL)
3931 goto nla_put_failure;
3932 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3933
3934 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3935 if (nla == NULL)
3936 goto nla_put_failure;
3937 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
3938
3939 nla_nest_end(skb, protoinfo);
3940 return nlmsg_end(skb, nlh);
3941
3942nla_put_failure:
3943 nlmsg_cancel(skb, nlh);
3944 return -EMSGSIZE;
3945}
3946
3947static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3948{
3949 struct net *net = sock_net(skb->sk);
3950 int h, s_h;
3951 int idx = 0, s_idx;
3952 struct net_device *dev;
3953 struct inet6_dev *idev;
3954 struct hlist_head *head;
3955 struct hlist_node *node;
3956
3957 s_h = cb->args[0];
3958 s_idx = cb->args[1];
3959
3960 rcu_read_lock();
3961 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3962 idx = 0;
3963 head = &net->dev_index_head[h];
3964 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3965 if (idx < s_idx)
3966 goto cont;
3967 idev = __in6_dev_get(dev);
3968 if (!idev)
3969 goto cont;
3970 if (inet6_fill_ifinfo(skb, idev,
3971 NETLINK_CB(cb->skb).pid,
3972 cb->nlh->nlmsg_seq,
3973 RTM_NEWLINK, NLM_F_MULTI) <= 0)
3974 goto out;
3975cont:
3976 idx++;
3977 }
3978 }
3979out:
3980 rcu_read_unlock();
3981 cb->args[1] = idx;
3982 cb->args[0] = h;
3983
3984 return skb->len;
3985}
3986
3987void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3988{
3989 struct sk_buff *skb;
3990 struct net *net = dev_net(idev->dev);
3991 int err = -ENOBUFS;
3992
3993 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
3994 if (skb == NULL)
3995 goto errout;
3996
3997 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
3998 if (err < 0) {
3999 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4000 WARN_ON(err == -EMSGSIZE);
4001 kfree_skb(skb);
4002 goto errout;
4003 }
4004 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4005 return;
4006errout:
4007 if (err < 0)
4008 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
4009}
4010
4011static inline size_t inet6_prefix_nlmsg_size(void)
4012{
4013 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4014 + nla_total_size(sizeof(struct in6_addr))
4015 + nla_total_size(sizeof(struct prefix_cacheinfo));
4016}
4017
4018static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
4019 struct prefix_info *pinfo, u32 pid, u32 seq,
4020 int event, unsigned int flags)
4021{
4022 struct prefixmsg *pmsg;
4023 struct nlmsghdr *nlh;
4024 struct prefix_cacheinfo ci;
4025
4026 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
4027 if (nlh == NULL)
4028 return -EMSGSIZE;
4029
4030 pmsg = nlmsg_data(nlh);
4031 pmsg->prefix_family = AF_INET6;
4032 pmsg->prefix_pad1 = 0;
4033 pmsg->prefix_pad2 = 0;
4034 pmsg->prefix_ifindex = idev->dev->ifindex;
4035 pmsg->prefix_len = pinfo->prefix_len;
4036 pmsg->prefix_type = pinfo->type;
4037 pmsg->prefix_pad3 = 0;
4038 pmsg->prefix_flags = 0;
4039 if (pinfo->onlink)
4040 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4041 if (pinfo->autoconf)
4042 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4043
4044 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
4045
4046 ci.preferred_time = ntohl(pinfo->prefered);
4047 ci.valid_time = ntohl(pinfo->valid);
4048 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
4049
4050 return nlmsg_end(skb, nlh);
4051
4052nla_put_failure:
4053 nlmsg_cancel(skb, nlh);
4054 return -EMSGSIZE;
4055}
4056
4057static void inet6_prefix_notify(int event, struct inet6_dev *idev,
4058 struct prefix_info *pinfo)
4059{
4060 struct sk_buff *skb;
4061 struct net *net = dev_net(idev->dev);
4062 int err = -ENOBUFS;
4063
4064 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
4065 if (skb == NULL)
4066 goto errout;
4067
4068 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
4069 if (err < 0) {
4070 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4071 WARN_ON(err == -EMSGSIZE);
4072 kfree_skb(skb);
4073 goto errout;
4074 }
4075 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4076 return;
4077errout:
4078 if (err < 0)
4079 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
4080}
4081
4082static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4083{
4084 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4085
4086 switch (event) {
4087 case RTM_NEWADDR:
4088 /*
4089 * If the address was optimistic
4090 * we inserted the route at the start of
4091 * our DAD process, so we don't need
4092 * to do it again
4093 */
4094 if (!(ifp->rt->rt6i_node))
4095 ip6_ins_rt(ifp->rt);
4096 if (ifp->idev->cnf.forwarding)
4097 addrconf_join_anycast(ifp);
4098 break;
4099 case RTM_DELADDR:
4100 if (ifp->idev->cnf.forwarding)
4101 addrconf_leave_anycast(ifp);
4102 addrconf_leave_solict(ifp->idev, &ifp->addr);
4103 dst_hold(&ifp->rt->dst);
4104
4105 if (ifp->state == INET6_IFADDR_STATE_DEAD &&
4106 ip6_del_rt(ifp->rt))
4107 dst_free(&ifp->rt->dst);
4108 break;
4109 }
4110}
4111
4112static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4113{
4114 rcu_read_lock_bh();
4115 if (likely(ifp->idev->dead == 0))
4116 __ipv6_ifa_notify(event, ifp);
4117 rcu_read_unlock_bh();
4118}
4119
4120#ifdef CONFIG_SYSCTL
4121
4122static
4123int addrconf_sysctl_forward(ctl_table *ctl, int write,
4124 void __user *buffer, size_t *lenp, loff_t *ppos)
4125{
4126 int *valp = ctl->data;
4127 int val = *valp;
4128 loff_t pos = *ppos;
4129 int ret;
4130
4131 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
4132
4133 if (write)
4134 ret = addrconf_fixup_forwarding(ctl, valp, val);
4135 if (ret)
4136 *ppos = pos;
4137 return ret;
4138}
4139
4140static void dev_disable_change(struct inet6_dev *idev)
4141{
4142 if (!idev || !idev->dev)
4143 return;
4144
4145 if (idev->cnf.disable_ipv6)
4146 addrconf_notify(NULL, NETDEV_DOWN, idev->dev);
4147 else
4148 addrconf_notify(NULL, NETDEV_UP, idev->dev);
4149}
4150
4151static void addrconf_disable_change(struct net *net, __s32 newf)
4152{
4153 struct net_device *dev;
4154 struct inet6_dev *idev;
4155
4156 rcu_read_lock();
4157 for_each_netdev_rcu(net, dev) {
4158 idev = __in6_dev_get(dev);
4159 if (idev) {
4160 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4161 idev->cnf.disable_ipv6 = newf;
4162 if (changed)
4163 dev_disable_change(idev);
4164 }
4165 }
4166 rcu_read_unlock();
4167}
4168
4169static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int old)
4170{
4171 struct net *net;
4172
4173 net = (struct net *)table->extra2;
4174
4175 if (p == &net->ipv6.devconf_dflt->disable_ipv6)
4176 return 0;
4177
4178 if (!rtnl_trylock()) {
4179 /* Restore the original values before restarting */
4180 *p = old;
4181 return restart_syscall();
4182 }
4183
4184 if (p == &net->ipv6.devconf_all->disable_ipv6) {
4185 __s32 newf = net->ipv6.devconf_all->disable_ipv6;
4186 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4187 addrconf_disable_change(net, newf);
4188 } else if ((!*p) ^ (!old))
4189 dev_disable_change((struct inet6_dev *)table->extra1);
4190
4191 rtnl_unlock();
4192 return 0;
4193}
4194
4195static
4196int addrconf_sysctl_disable(ctl_table *ctl, int write,
4197 void __user *buffer, size_t *lenp, loff_t *ppos)
4198{
4199 int *valp = ctl->data;
4200 int val = *valp;
4201 loff_t pos = *ppos;
4202 int ret;
4203
4204 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
4205
4206 if (write)
4207 ret = addrconf_disable_ipv6(ctl, valp, val);
4208 if (ret)
4209 *ppos = pos;
4210 return ret;
4211}
4212
4213static struct addrconf_sysctl_table
4214{
4215 struct ctl_table_header *sysctl_header;
4216 ctl_table addrconf_vars[DEVCONF_MAX+1];
4217 char *dev_name;
4218} addrconf_sysctl __read_mostly = {
4219 .sysctl_header = NULL,
4220 .addrconf_vars = {
4221 {
4222 .procname = "forwarding",
4223 .data = &ipv6_devconf.forwarding,
4224 .maxlen = sizeof(int),
4225 .mode = 0644,
4226 .proc_handler = addrconf_sysctl_forward,
4227 },
4228 {
4229 .procname = "hop_limit",
4230 .data = &ipv6_devconf.hop_limit,
4231 .maxlen = sizeof(int),
4232 .mode = 0644,
4233 .proc_handler = proc_dointvec,
4234 },
4235 {
4236 .procname = "mtu",
4237 .data = &ipv6_devconf.mtu6,
4238 .maxlen = sizeof(int),
4239 .mode = 0644,
4240 .proc_handler = proc_dointvec,
4241 },
4242 {
4243 .procname = "accept_ra",
4244 .data = &ipv6_devconf.accept_ra,
4245 .maxlen = sizeof(int),
4246 .mode = 0644,
4247 .proc_handler = proc_dointvec,
4248 },
4249 {
4250 .procname = "accept_redirects",
4251 .data = &ipv6_devconf.accept_redirects,
4252 .maxlen = sizeof(int),
4253 .mode = 0644,
4254 .proc_handler = proc_dointvec,
4255 },
4256 {
4257 .procname = "autoconf",
4258 .data = &ipv6_devconf.autoconf,
4259 .maxlen = sizeof(int),
4260 .mode = 0644,
4261 .proc_handler = proc_dointvec,
4262 },
4263 {
4264 .procname = "dad_transmits",
4265 .data = &ipv6_devconf.dad_transmits,
4266 .maxlen = sizeof(int),
4267 .mode = 0644,
4268 .proc_handler = proc_dointvec,
4269 },
4270 {
4271 .procname = "router_solicitations",
4272 .data = &ipv6_devconf.rtr_solicits,
4273 .maxlen = sizeof(int),
4274 .mode = 0644,
4275 .proc_handler = proc_dointvec,
4276 },
4277 {
4278 .procname = "router_solicitation_interval",
4279 .data = &ipv6_devconf.rtr_solicit_interval,
4280 .maxlen = sizeof(int),
4281 .mode = 0644,
4282 .proc_handler = proc_dointvec_jiffies,
4283 },
4284 {
4285 .procname = "router_solicitation_delay",
4286 .data = &ipv6_devconf.rtr_solicit_delay,
4287 .maxlen = sizeof(int),
4288 .mode = 0644,
4289 .proc_handler = proc_dointvec_jiffies,
4290 },
4291 {
4292 .procname = "force_mld_version",
4293 .data = &ipv6_devconf.force_mld_version,
4294 .maxlen = sizeof(int),
4295 .mode = 0644,
4296 .proc_handler = proc_dointvec,
4297 },
4298#ifdef CONFIG_IPV6_PRIVACY
4299 {
4300 .procname = "use_tempaddr",
4301 .data = &ipv6_devconf.use_tempaddr,
4302 .maxlen = sizeof(int),
4303 .mode = 0644,
4304 .proc_handler = proc_dointvec,
4305 },
4306 {
4307 .procname = "temp_valid_lft",
4308 .data = &ipv6_devconf.temp_valid_lft,
4309 .maxlen = sizeof(int),
4310 .mode = 0644,
4311 .proc_handler = proc_dointvec,
4312 },
4313 {
4314 .procname = "temp_prefered_lft",
4315 .data = &ipv6_devconf.temp_prefered_lft,
4316 .maxlen = sizeof(int),
4317 .mode = 0644,
4318 .proc_handler = proc_dointvec,
4319 },
4320 {
4321 .procname = "regen_max_retry",
4322 .data = &ipv6_devconf.regen_max_retry,
4323 .maxlen = sizeof(int),
4324 .mode = 0644,
4325 .proc_handler = proc_dointvec,
4326 },
4327 {
4328 .procname = "max_desync_factor",
4329 .data = &ipv6_devconf.max_desync_factor,
4330 .maxlen = sizeof(int),
4331 .mode = 0644,
4332 .proc_handler = proc_dointvec,
4333 },
4334#endif
4335 {
4336 .procname = "max_addresses",
4337 .data = &ipv6_devconf.max_addresses,
4338 .maxlen = sizeof(int),
4339 .mode = 0644,
4340 .proc_handler = proc_dointvec,
4341 },
4342 {
4343 .procname = "accept_ra_defrtr",
4344 .data = &ipv6_devconf.accept_ra_defrtr,
4345 .maxlen = sizeof(int),
4346 .mode = 0644,
4347 .proc_handler = proc_dointvec,
4348 },
4349 {
4350 .procname = "accept_ra_pinfo",
4351 .data = &ipv6_devconf.accept_ra_pinfo,
4352 .maxlen = sizeof(int),
4353 .mode = 0644,
4354 .proc_handler = proc_dointvec,
4355 },
4356#ifdef CONFIG_IPV6_ROUTER_PREF
4357 {
4358 .procname = "accept_ra_rtr_pref",
4359 .data = &ipv6_devconf.accept_ra_rtr_pref,
4360 .maxlen = sizeof(int),
4361 .mode = 0644,
4362 .proc_handler = proc_dointvec,
4363 },
4364 {
4365 .procname = "router_probe_interval",
4366 .data = &ipv6_devconf.rtr_probe_interval,
4367 .maxlen = sizeof(int),
4368 .mode = 0644,
4369 .proc_handler = proc_dointvec_jiffies,
4370 },
4371#ifdef CONFIG_IPV6_ROUTE_INFO
4372 {
4373 .procname = "accept_ra_rt_info_max_plen",
4374 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4375 .maxlen = sizeof(int),
4376 .mode = 0644,
4377 .proc_handler = proc_dointvec,
4378 },
4379#endif
4380#endif
4381 {
4382 .procname = "proxy_ndp",
4383 .data = &ipv6_devconf.proxy_ndp,
4384 .maxlen = sizeof(int),
4385 .mode = 0644,
4386 .proc_handler = proc_dointvec,
4387 },
4388 {
4389 .procname = "accept_source_route",
4390 .data = &ipv6_devconf.accept_source_route,
4391 .maxlen = sizeof(int),
4392 .mode = 0644,
4393 .proc_handler = proc_dointvec,
4394 },
4395#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4396 {
4397 .procname = "optimistic_dad",
4398 .data = &ipv6_devconf.optimistic_dad,
4399 .maxlen = sizeof(int),
4400 .mode = 0644,
4401 .proc_handler = proc_dointvec,
4402
4403 },
4404#endif
4405#ifdef CONFIG_IPV6_MROUTE
4406 {
4407 .procname = "mc_forwarding",
4408 .data = &ipv6_devconf.mc_forwarding,
4409 .maxlen = sizeof(int),
4410 .mode = 0444,
4411 .proc_handler = proc_dointvec,
4412 },
4413#endif
4414 {
4415 .procname = "disable_ipv6",
4416 .data = &ipv6_devconf.disable_ipv6,
4417 .maxlen = sizeof(int),
4418 .mode = 0644,
4419 .proc_handler = addrconf_sysctl_disable,
4420 },
4421 {
4422 .procname = "accept_dad",
4423 .data = &ipv6_devconf.accept_dad,
4424 .maxlen = sizeof(int),
4425 .mode = 0644,
4426 .proc_handler = proc_dointvec,
4427 },
4428 {
4429 .procname = "force_tllao",
4430 .data = &ipv6_devconf.force_tllao,
4431 .maxlen = sizeof(int),
4432 .mode = 0644,
4433 .proc_handler = proc_dointvec
4434 },
4435 {
4436 /* sentinel */
4437 }
4438 },
4439};
4440
4441static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4442 struct inet6_dev *idev, struct ipv6_devconf *p)
4443{
4444 int i;
4445 struct addrconf_sysctl_table *t;
4446
4447#define ADDRCONF_CTL_PATH_DEV 3
4448
4449 struct ctl_path addrconf_ctl_path[] = {
4450 { .procname = "net", },
4451 { .procname = "ipv6", },
4452 { .procname = "conf", },
4453 { /* to be set */ },
4454 { },
4455 };
4456
4457
4458 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4459 if (t == NULL)
4460 goto out;
4461
4462 for (i = 0; t->addrconf_vars[i].data; i++) {
4463 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
4464 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4465 t->addrconf_vars[i].extra2 = net;
4466 }
4467
4468 /*
4469 * Make a copy of dev_name, because '.procname' is regarded as const
4470 * by sysctl and we wouldn't want anyone to change it under our feet
4471 * (see SIOCSIFNAME).
4472 */
4473 t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4474 if (!t->dev_name)
4475 goto free;
4476
4477 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
4478
4479 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
4480 t->addrconf_vars);
4481 if (t->sysctl_header == NULL)
4482 goto free_procname;
4483
4484 p->sysctl = t;
4485 return 0;
4486
4487free_procname:
4488 kfree(t->dev_name);
4489free:
4490 kfree(t);
4491out:
4492 return -ENOBUFS;
4493}
4494
4495static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4496{
4497 struct addrconf_sysctl_table *t;
4498
4499 if (p->sysctl == NULL)
4500 return;
4501
4502 t = p->sysctl;
4503 p->sysctl = NULL;
4504 unregister_sysctl_table(t->sysctl_header);
4505 kfree(t->dev_name);
4506 kfree(t);
4507}
4508
4509static void addrconf_sysctl_register(struct inet6_dev *idev)
4510{
4511 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
4512 &ndisc_ifinfo_sysctl_change);
4513 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
4514 idev, &idev->cnf);
4515}
4516
4517static void addrconf_sysctl_unregister(struct inet6_dev *idev)
4518{
4519 __addrconf_sysctl_unregister(&idev->cnf);
4520 neigh_sysctl_unregister(idev->nd_parms);
4521}
4522
4523
4524#endif
4525
4526static int __net_init addrconf_init_net(struct net *net)
4527{
4528 int err;
4529 struct ipv6_devconf *all, *dflt;
4530
4531 err = -ENOMEM;
4532 all = &ipv6_devconf;
4533 dflt = &ipv6_devconf_dflt;
4534
4535 if (!net_eq(net, &init_net)) {
4536 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4537 if (all == NULL)
4538 goto err_alloc_all;
4539
4540 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4541 if (dflt == NULL)
4542 goto err_alloc_dflt;
4543 } else {
4544 /* these will be inherited by all namespaces */
4545 dflt->autoconf = ipv6_defaults.autoconf;
4546 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
4547 }
4548
4549 net->ipv6.devconf_all = all;
4550 net->ipv6.devconf_dflt = dflt;
4551
4552#ifdef CONFIG_SYSCTL
4553 err = __addrconf_sysctl_register(net, "all", NULL, all);
4554 if (err < 0)
4555 goto err_reg_all;
4556
4557 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
4558 if (err < 0)
4559 goto err_reg_dflt;
4560#endif
4561 return 0;
4562
4563#ifdef CONFIG_SYSCTL
4564err_reg_dflt:
4565 __addrconf_sysctl_unregister(all);
4566err_reg_all:
4567 kfree(dflt);
4568#endif
4569err_alloc_dflt:
4570 kfree(all);
4571err_alloc_all:
4572 return err;
4573}
4574
4575static void __net_exit addrconf_exit_net(struct net *net)
4576{
4577#ifdef CONFIG_SYSCTL
4578 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4579 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4580#endif
4581 if (!net_eq(net, &init_net)) {
4582 kfree(net->ipv6.devconf_dflt);
4583 kfree(net->ipv6.devconf_all);
4584 }
4585}
4586
4587static struct pernet_operations addrconf_ops = {
4588 .init = addrconf_init_net,
4589 .exit = addrconf_exit_net,
4590};
4591
4592/*
4593 * Device notifier
4594 */
4595
4596int register_inet6addr_notifier(struct notifier_block *nb)
4597{
4598 return atomic_notifier_chain_register(&inet6addr_chain, nb);
4599}
4600EXPORT_SYMBOL(register_inet6addr_notifier);
4601
4602int unregister_inet6addr_notifier(struct notifier_block *nb)
4603{
4604 return atomic_notifier_chain_unregister(&inet6addr_chain, nb);
4605}
4606EXPORT_SYMBOL(unregister_inet6addr_notifier);
4607
4608/*
4609 * Init / cleanup code
4610 */
4611
4612int __init addrconf_init(void)
4613{
4614 int i, err;
4615
4616 err = ipv6_addr_label_init();
4617 if (err < 0) {
4618 printk(KERN_CRIT "IPv6 Addrconf:"
4619 " cannot initialize default policy table: %d.\n", err);
4620 return err;
4621 }
4622
4623 register_pernet_subsys(&addrconf_ops);
4624
4625 /* The addrconf netdev notifier requires that loopback_dev
4626 * has it's ipv6 private information allocated and setup
4627 * before it can bring up and give link-local addresses
4628 * to other devices which are up.
4629 *
4630 * Unfortunately, loopback_dev is not necessarily the first
4631 * entry in the global dev_base list of net devices. In fact,
4632 * it is likely to be the very last entry on that list.
4633 * So this causes the notifier registry below to try and
4634 * give link-local addresses to all devices besides loopback_dev
4635 * first, then loopback_dev, which cases all the non-loopback_dev
4636 * devices to fail to get a link-local address.
4637 *
4638 * So, as a temporary fix, allocate the ipv6 structure for
4639 * loopback_dev first by hand.
4640 * Longer term, all of the dependencies ipv6 has upon the loopback
4641 * device and it being up should be removed.
4642 */
4643 rtnl_lock();
4644 if (!ipv6_add_dev(init_net.loopback_dev))
4645 err = -ENOMEM;
4646 rtnl_unlock();
4647 if (err)
4648 goto errlo;
4649
4650 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4651 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
4652
4653 register_netdevice_notifier(&ipv6_dev_notf);
4654
4655 addrconf_verify(0);
4656
4657 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4658 if (err < 0)
4659 goto errout;
4660
4661 /* Only the first call to __rtnl_register can fail */
4662 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4663 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4664 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4665 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4666 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4667
4668 ipv6_addr_label_rtnl_register();
4669
4670 return 0;
4671errout:
4672 unregister_netdevice_notifier(&ipv6_dev_notf);
4673errlo:
4674 unregister_pernet_subsys(&addrconf_ops);
4675
4676 return err;
4677}
4678
4679void addrconf_cleanup(void)
4680{
4681 struct net_device *dev;
4682 int i;
4683
4684 unregister_netdevice_notifier(&ipv6_dev_notf);
4685 unregister_pernet_subsys(&addrconf_ops);
4686
4687 rtnl_lock();
4688
4689 /* clean dev list */
4690 for_each_netdev(&init_net, dev) {
4691 if (__in6_dev_get(dev) == NULL)
4692 continue;
4693 addrconf_ifdown(dev, 1);
4694 }
4695 addrconf_ifdown(init_net.loopback_dev, 2);
4696
4697 /*
4698 * Check hash table.
4699 */
4700 spin_lock_bh(&addrconf_hash_lock);
4701 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4702 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
4703 spin_unlock_bh(&addrconf_hash_lock);
4704
4705 del_timer(&addr_chk_timer);
4706 rtnl_unlock();
4707}
Clone of davem's net-next-2.6 tree