?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
md/raid10: Handle write errors by updating badblock log.
[linux/fpc-iii.git] / net / ipv6 / addrconf.c
blob498b927f68be44248c60fc47a816b0dd171e483c
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
102 static inline u32 cstamp_delta(unsigned long cstamp)
103 {
104 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
105 }
106
107 #define ADDRCONF_TIMER_FUZZ_MINUS (HZ > 50 ? HZ/50 : 1)
108 #define ADDRCONF_TIMER_FUZZ (HZ / 4)
109 #define ADDRCONF_TIMER_FUZZ_MAX (HZ)
110
111 #ifdef CONFIG_SYSCTL
112 static void addrconf_sysctl_register(struct inet6_dev *idev);
113 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
114 #else
115 static inline void addrconf_sysctl_register(struct inet6_dev *idev)
116 {
117 }
118
119 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
120 {
121 }
122 #endif
123
124 #ifdef CONFIG_IPV6_PRIVACY
125 static int __ipv6_regen_rndid(struct inet6_dev *idev);
126 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
127 static void ipv6_regen_rndid(unsigned long data);
128 #endif
129
130 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
131 static int ipv6_count_addresses(struct inet6_dev *idev);
132
133 /*
134 * Configured unicast address hash table
135 */
136 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
137 static DEFINE_SPINLOCK(addrconf_hash_lock);
138
139 static void addrconf_verify(unsigned long);
140
141 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
142 static DEFINE_SPINLOCK(addrconf_verify_lock);
143
144 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
145 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
146
147 static void addrconf_type_change(struct net_device *dev,
148 unsigned long event);
149 static int addrconf_ifdown(struct net_device *dev, int how);
150
151 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
152 static void addrconf_dad_timer(unsigned long data);
153 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
154 static void addrconf_dad_run(struct inet6_dev *idev);
155 static void addrconf_rs_timer(unsigned long data);
156 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
157 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
158
159 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
160 struct prefix_info *pinfo);
161 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
162 struct net_device *dev);
163
164 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
165
166 static struct ipv6_devconf ipv6_devconf __read_mostly = {
167 .forwarding = 0,
168 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
169 .mtu6 = IPV6_MIN_MTU,
170 .accept_ra = 1,
171 .accept_redirects = 1,
172 .autoconf = 1,
173 .force_mld_version = 0,
174 .dad_transmits = 1,
175 .rtr_solicits = MAX_RTR_SOLICITATIONS,
176 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
177 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
178 #ifdef CONFIG_IPV6_PRIVACY
179 .use_tempaddr = 0,
180 .temp_valid_lft = TEMP_VALID_LIFETIME,
181 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
182 .regen_max_retry = REGEN_MAX_RETRY,
183 .max_desync_factor = MAX_DESYNC_FACTOR,
184 #endif
185 .max_addresses = IPV6_MAX_ADDRESSES,
186 .accept_ra_defrtr = 1,
187 .accept_ra_pinfo = 1,
188 #ifdef CONFIG_IPV6_ROUTER_PREF
189 .accept_ra_rtr_pref = 1,
190 .rtr_probe_interval = 60 * HZ,
191 #ifdef CONFIG_IPV6_ROUTE_INFO
192 .accept_ra_rt_info_max_plen = 0,
193 #endif
194 #endif
195 .proxy_ndp = 0,
196 .accept_source_route = 0, /* we do not accept RH0 by default. */
197 .disable_ipv6 = 0,
198 .accept_dad = 1,
199 };
200
201 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
202 .forwarding = 0,
203 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
204 .mtu6 = IPV6_MIN_MTU,
205 .accept_ra = 1,
206 .accept_redirects = 1,
207 .autoconf = 1,
208 .dad_transmits = 1,
209 .rtr_solicits = MAX_RTR_SOLICITATIONS,
210 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
211 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
212 #ifdef CONFIG_IPV6_PRIVACY
213 .use_tempaddr = 0,
214 .temp_valid_lft = TEMP_VALID_LIFETIME,
215 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
216 .regen_max_retry = REGEN_MAX_RETRY,
217 .max_desync_factor = MAX_DESYNC_FACTOR,
218 #endif
219 .max_addresses = IPV6_MAX_ADDRESSES,
220 .accept_ra_defrtr = 1,
221 .accept_ra_pinfo = 1,
222 #ifdef CONFIG_IPV6_ROUTER_PREF
223 .accept_ra_rtr_pref = 1,
224 .rtr_probe_interval = 60 * HZ,
225 #ifdef CONFIG_IPV6_ROUTE_INFO
226 .accept_ra_rt_info_max_plen = 0,
227 #endif
228 #endif
229 .proxy_ndp = 0,
230 .accept_source_route = 0, /* we do not accept RH0 by default. */
231 .disable_ipv6 = 0,
232 .accept_dad = 1,
233 };
234
235 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
236 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
237 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
238 const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
239 const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
240
241 /* Check if a valid qdisc is available */
242 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
243 {
244 return !qdisc_tx_is_noop(dev);
245 }
246
247 /* Check if a route is valid prefix route */
248 static inline int addrconf_is_prefix_route(const struct rt6_info *rt)
249 {
250 return (rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0;
251 }
252
253 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
254 {
255 if (del_timer(&ifp->timer))
256 __in6_ifa_put(ifp);
257 }
258
259 enum addrconf_timer_t {
260 AC_NONE,
261 AC_DAD,
262 AC_RS,
263 };
264
265 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
266 enum addrconf_timer_t what,
267 unsigned long when)
268 {
269 if (!del_timer(&ifp->timer))
270 in6_ifa_hold(ifp);
271
272 switch (what) {
273 case AC_DAD:
274 ifp->timer.function = addrconf_dad_timer;
275 break;
276 case AC_RS:
277 ifp->timer.function = addrconf_rs_timer;
278 break;
279 default:
280 break;
281 }
282 ifp->timer.expires = jiffies + when;
283 add_timer(&ifp->timer);
284 }
285
286 static int snmp6_alloc_dev(struct inet6_dev *idev)
287 {
288 if (snmp_mib_init((void __percpu **)idev->stats.ipv6,
289 sizeof(struct ipstats_mib),
290 __alignof__(struct ipstats_mib)) < 0)
291 goto err_ip;
292 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
293 GFP_KERNEL);
294 if (!idev->stats.icmpv6dev)
295 goto err_icmp;
296 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
297 GFP_KERNEL);
298 if (!idev->stats.icmpv6msgdev)
299 goto err_icmpmsg;
300
301 return 0;
302
303 err_icmpmsg:
304 kfree(idev->stats.icmpv6dev);
305 err_icmp:
306 snmp_mib_free((void __percpu **)idev->stats.ipv6);
307 err_ip:
308 return -ENOMEM;
309 }
310
311 static void snmp6_free_dev(struct inet6_dev *idev)
312 {
313 kfree(idev->stats.icmpv6msgdev);
314 kfree(idev->stats.icmpv6dev);
315 snmp_mib_free((void __percpu **)idev->stats.ipv6);
316 }
317
318 /* Nobody refers to this device, we may destroy it. */
319
320 void in6_dev_finish_destroy(struct inet6_dev *idev)
321 {
322 struct net_device *dev = idev->dev;
323
324 WARN_ON(!list_empty(&idev->addr_list));
325 WARN_ON(idev->mc_list != NULL);
326
327 #ifdef NET_REFCNT_DEBUG
328 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
329 #endif
330 dev_put(dev);
331 if (!idev->dead) {
332 pr_warning("Freeing alive inet6 device %p\n", idev);
333 return;
334 }
335 snmp6_free_dev(idev);
336 kfree_rcu(idev, rcu);
337 }
338
339 EXPORT_SYMBOL(in6_dev_finish_destroy);
340
341 static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
342 {
343 struct inet6_dev *ndev;
344
345 ASSERT_RTNL();
346
347 if (dev->mtu < IPV6_MIN_MTU)
348 return NULL;
349
350 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
351
352 if (ndev == NULL)
353 return NULL;
354
355 rwlock_init(&ndev->lock);
356 ndev->dev = dev;
357 INIT_LIST_HEAD(&ndev->addr_list);
358
359 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
360 ndev->cnf.mtu6 = dev->mtu;
361 ndev->cnf.sysctl = NULL;
362 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
363 if (ndev->nd_parms == NULL) {
364 kfree(ndev);
365 return NULL;
366 }
367 if (ndev->cnf.forwarding)
368 dev_disable_lro(dev);
369 /* We refer to the device */
370 dev_hold(dev);
371
372 if (snmp6_alloc_dev(ndev) < 0) {
373 ADBG((KERN_WARNING
374 "%s(): cannot allocate memory for statistics; dev=%s.\n",
375 __func__, dev->name));
376 neigh_parms_release(&nd_tbl, ndev->nd_parms);
377 ndev->dead = 1;
378 in6_dev_finish_destroy(ndev);
379 return NULL;
380 }
381
382 if (snmp6_register_dev(ndev) < 0) {
383 ADBG((KERN_WARNING
384 "%s(): cannot create /proc/net/dev_snmp6/%s\n",
385 __func__, dev->name));
386 neigh_parms_release(&nd_tbl, ndev->nd_parms);
387 ndev->dead = 1;
388 in6_dev_finish_destroy(ndev);
389 return NULL;
390 }
391
392 /* One reference from device. We must do this before
393 * we invoke __ipv6_regen_rndid().
394 */
395 in6_dev_hold(ndev);
396
397 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
398 ndev->cnf.accept_dad = -1;
399
400 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
401 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
402 printk(KERN_INFO
403 "%s: Disabled Multicast RS\n",
404 dev->name);
405 ndev->cnf.rtr_solicits = 0;
406 }
407 #endif
408
409 #ifdef CONFIG_IPV6_PRIVACY
410 INIT_LIST_HEAD(&ndev->tempaddr_list);
411 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
412 if ((dev->flags&IFF_LOOPBACK) ||
413 dev->type == ARPHRD_TUNNEL ||
414 dev->type == ARPHRD_TUNNEL6 ||
415 dev->type == ARPHRD_SIT ||
416 dev->type == ARPHRD_NONE) {
417 ndev->cnf.use_tempaddr = -1;
418 } else {
419 in6_dev_hold(ndev);
420 ipv6_regen_rndid((unsigned long) ndev);
421 }
422 #endif
423
424 if (netif_running(dev) && addrconf_qdisc_ok(dev))
425 ndev->if_flags |= IF_READY;
426
427 ipv6_mc_init_dev(ndev);
428 ndev->tstamp = jiffies;
429 addrconf_sysctl_register(ndev);
430 /* protected by rtnl_lock */
431 rcu_assign_pointer(dev->ip6_ptr, ndev);
432
433 /* Join all-node multicast group */
434 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
435
436 return ndev;
437 }
438
439 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
440 {
441 struct inet6_dev *idev;
442
443 ASSERT_RTNL();
444
445 idev = __in6_dev_get(dev);
446 if (!idev) {
447 idev = ipv6_add_dev(dev);
448 if (!idev)
449 return NULL;
450 }
451
452 if (dev->flags&IFF_UP)
453 ipv6_mc_up(idev);
454 return idev;
455 }
456
457 #ifdef CONFIG_SYSCTL
458 static void dev_forward_change(struct inet6_dev *idev)
459 {
460 struct net_device *dev;
461 struct inet6_ifaddr *ifa;
462
463 if (!idev)
464 return;
465 dev = idev->dev;
466 if (idev->cnf.forwarding)
467 dev_disable_lro(dev);
468 if (dev && (dev->flags & IFF_MULTICAST)) {
469 if (idev->cnf.forwarding)
470 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
471 else
472 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
473 }
474
475 list_for_each_entry(ifa, &idev->addr_list, if_list) {
476 if (ifa->flags&IFA_F_TENTATIVE)
477 continue;
478 if (idev->cnf.forwarding)
479 addrconf_join_anycast(ifa);
480 else
481 addrconf_leave_anycast(ifa);
482 }
483 }
484
485
486 static void addrconf_forward_change(struct net *net, __s32 newf)
487 {
488 struct net_device *dev;
489 struct inet6_dev *idev;
490
491 rcu_read_lock();
492 for_each_netdev_rcu(net, dev) {
493 idev = __in6_dev_get(dev);
494 if (idev) {
495 int changed = (!idev->cnf.forwarding) ^ (!newf);
496 idev->cnf.forwarding = newf;
497 if (changed)
498 dev_forward_change(idev);
499 }
500 }
501 rcu_read_unlock();
502 }
503
504 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old)
505 {
506 struct net *net;
507
508 net = (struct net *)table->extra2;
509 if (p == &net->ipv6.devconf_dflt->forwarding)
510 return 0;
511
512 if (!rtnl_trylock()) {
513 /* Restore the original values before restarting */
514 *p = old;
515 return restart_syscall();
516 }
517
518 if (p == &net->ipv6.devconf_all->forwarding) {
519 __s32 newf = net->ipv6.devconf_all->forwarding;
520 net->ipv6.devconf_dflt->forwarding = newf;
521 addrconf_forward_change(net, newf);
522 } else if ((!*p) ^ (!old))
523 dev_forward_change((struct inet6_dev *)table->extra1);
524 rtnl_unlock();
525
526 if (*p)
527 rt6_purge_dflt_routers(net);
528 return 1;
529 }
530 #endif
531
532 /* Nobody refers to this ifaddr, destroy it */
533 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
534 {
535 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
536
537 #ifdef NET_REFCNT_DEBUG
538 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
539 #endif
540
541 in6_dev_put(ifp->idev);
542
543 if (del_timer(&ifp->timer))
544 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp);
545
546 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
547 pr_warning("Freeing alive inet6 address %p\n", ifp);
548 return;
549 }
550 dst_release(&ifp->rt->dst);
551
552 kfree_rcu(ifp, rcu);
553 }
554
555 static void
556 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
557 {
558 struct list_head *p;
559 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
560
561 /*
562 * Each device address list is sorted in order of scope -
563 * global before linklocal.
564 */
565 list_for_each(p, &idev->addr_list) {
566 struct inet6_ifaddr *ifa
567 = list_entry(p, struct inet6_ifaddr, if_list);
568 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
569 break;
570 }
571
572 list_add_tail(&ifp->if_list, p);
573 }
574
575 static u32 ipv6_addr_hash(const struct in6_addr *addr)
576 {
577 /*
578 * We perform the hash function over the last 64 bits of the address
579 * This will include the IEEE address token on links that support it.
580 */
581 return jhash_2words((__force u32)addr->s6_addr32[2],
582 (__force u32)addr->s6_addr32[3], 0)
583 & (IN6_ADDR_HSIZE - 1);
584 }
585
586 /* On success it returns ifp with increased reference count */
587
588 static struct inet6_ifaddr *
589 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
590 int scope, u32 flags)
591 {
592 struct inet6_ifaddr *ifa = NULL;
593 struct rt6_info *rt;
594 unsigned int hash;
595 int err = 0;
596 int addr_type = ipv6_addr_type(addr);
597
598 if (addr_type == IPV6_ADDR_ANY ||
599 addr_type & IPV6_ADDR_MULTICAST ||
600 (!(idev->dev->flags & IFF_LOOPBACK) &&
601 addr_type & IPV6_ADDR_LOOPBACK))
602 return ERR_PTR(-EADDRNOTAVAIL);
603
604 rcu_read_lock_bh();
605 if (idev->dead) {
606 err = -ENODEV; /*XXX*/
607 goto out2;
608 }
609
610 if (idev->cnf.disable_ipv6) {
611 err = -EACCES;
612 goto out2;
613 }
614
615 spin_lock(&addrconf_hash_lock);
616
617 /* Ignore adding duplicate addresses on an interface */
618 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
619 ADBG(("ipv6_add_addr: already assigned\n"));
620 err = -EEXIST;
621 goto out;
622 }
623
624 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
625
626 if (ifa == NULL) {
627 ADBG(("ipv6_add_addr: malloc failed\n"));
628 err = -ENOBUFS;
629 goto out;
630 }
631
632 rt = addrconf_dst_alloc(idev, addr, 0);
633 if (IS_ERR(rt)) {
634 err = PTR_ERR(rt);
635 goto out;
636 }
637
638 ipv6_addr_copy(&ifa->addr, addr);
639
640 spin_lock_init(&ifa->lock);
641 spin_lock_init(&ifa->state_lock);
642 init_timer(&ifa->timer);
643 INIT_HLIST_NODE(&ifa->addr_lst);
644 ifa->timer.data = (unsigned long) ifa;
645 ifa->scope = scope;
646 ifa->prefix_len = pfxlen;
647 ifa->flags = flags | IFA_F_TENTATIVE;
648 ifa->cstamp = ifa->tstamp = jiffies;
649
650 ifa->rt = rt;
651
652 /*
653 * part one of RFC 4429, section 3.3
654 * We should not configure an address as
655 * optimistic if we do not yet know the link
656 * layer address of our nexhop router
657 */
658
659 if (rt->rt6i_nexthop == NULL)
660 ifa->flags &= ~IFA_F_OPTIMISTIC;
661
662 ifa->idev = idev;
663 in6_dev_hold(idev);
664 /* For caller */
665 in6_ifa_hold(ifa);
666
667 /* Add to big hash table */
668 hash = ipv6_addr_hash(addr);
669
670 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
671 spin_unlock(&addrconf_hash_lock);
672
673 write_lock(&idev->lock);
674 /* Add to inet6_dev unicast addr list. */
675 ipv6_link_dev_addr(idev, ifa);
676
677 #ifdef CONFIG_IPV6_PRIVACY
678 if (ifa->flags&IFA_F_TEMPORARY) {
679 list_add(&ifa->tmp_list, &idev->tempaddr_list);
680 in6_ifa_hold(ifa);
681 }
682 #endif
683
684 in6_ifa_hold(ifa);
685 write_unlock(&idev->lock);
686 out2:
687 rcu_read_unlock_bh();
688
689 if (likely(err == 0))
690 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
691 else {
692 kfree(ifa);
693 ifa = ERR_PTR(err);
694 }
695
696 return ifa;
697 out:
698 spin_unlock(&addrconf_hash_lock);
699 goto out2;
700 }
701
702 /* This function wants to get referenced ifp and releases it before return */
703
704 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
705 {
706 struct inet6_ifaddr *ifa, *ifn;
707 struct inet6_dev *idev = ifp->idev;
708 int state;
709 int deleted = 0, onlink = 0;
710 unsigned long expires = jiffies;
711
712 spin_lock_bh(&ifp->state_lock);
713 state = ifp->state;
714 ifp->state = INET6_IFADDR_STATE_DEAD;
715 spin_unlock_bh(&ifp->state_lock);
716
717 if (state == INET6_IFADDR_STATE_DEAD)
718 goto out;
719
720 spin_lock_bh(&addrconf_hash_lock);
721 hlist_del_init_rcu(&ifp->addr_lst);
722 spin_unlock_bh(&addrconf_hash_lock);
723
724 write_lock_bh(&idev->lock);
725 #ifdef CONFIG_IPV6_PRIVACY
726 if (ifp->flags&IFA_F_TEMPORARY) {
727 list_del(&ifp->tmp_list);
728 if (ifp->ifpub) {
729 in6_ifa_put(ifp->ifpub);
730 ifp->ifpub = NULL;
731 }
732 __in6_ifa_put(ifp);
733 }
734 #endif
735
736 list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) {
737 if (ifa == ifp) {
738 list_del_init(&ifp->if_list);
739 __in6_ifa_put(ifp);
740
741 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
742 break;
743 deleted = 1;
744 continue;
745 } else if (ifp->flags & IFA_F_PERMANENT) {
746 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
747 ifp->prefix_len)) {
748 if (ifa->flags & IFA_F_PERMANENT) {
749 onlink = 1;
750 if (deleted)
751 break;
752 } else {
753 unsigned long lifetime;
754
755 if (!onlink)
756 onlink = -1;
757
758 spin_lock(&ifa->lock);
759
760 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
761 /*
762 * Note: Because this address is
763 * not permanent, lifetime <
764 * LONG_MAX / HZ here.
765 */
766 if (time_before(expires,
767 ifa->tstamp + lifetime * HZ))
768 expires = ifa->tstamp + lifetime * HZ;
769 spin_unlock(&ifa->lock);
770 }
771 }
772 }
773 }
774 write_unlock_bh(&idev->lock);
775
776 addrconf_del_timer(ifp);
777
778 ipv6_ifa_notify(RTM_DELADDR, ifp);
779
780 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
781
782 /*
783 * Purge or update corresponding prefix
784 *
785 * 1) we don't purge prefix here if address was not permanent.
786 * prefix is managed by its own lifetime.
787 * 2) if there're no addresses, delete prefix.
788 * 3) if there're still other permanent address(es),
789 * corresponding prefix is still permanent.
790 * 4) otherwise, update prefix lifetime to the
791 * longest valid lifetime among the corresponding
792 * addresses on the device.
793 * Note: subsequent RA will update lifetime.
794 *
795 * --yoshfuji
796 */
797 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
798 struct in6_addr prefix;
799 struct rt6_info *rt;
800 struct net *net = dev_net(ifp->idev->dev);
801 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
802 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1);
803
804 if (rt && addrconf_is_prefix_route(rt)) {
805 if (onlink == 0) {
806 ip6_del_rt(rt);
807 rt = NULL;
808 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
809 rt->rt6i_expires = expires;
810 rt->rt6i_flags |= RTF_EXPIRES;
811 }
812 }
813 dst_release(&rt->dst);
814 }
815
816 /* clean up prefsrc entries */
817 rt6_remove_prefsrc(ifp);
818 out:
819 in6_ifa_put(ifp);
820 }
821
822 #ifdef CONFIG_IPV6_PRIVACY
823 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
824 {
825 struct inet6_dev *idev = ifp->idev;
826 struct in6_addr addr, *tmpaddr;
827 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp, age;
828 unsigned long regen_advance;
829 int tmp_plen;
830 int ret = 0;
831 int max_addresses;
832 u32 addr_flags;
833
834 write_lock(&idev->lock);
835 if (ift) {
836 spin_lock_bh(&ift->lock);
837 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
838 spin_unlock_bh(&ift->lock);
839 tmpaddr = &addr;
840 } else {
841 tmpaddr = NULL;
842 }
843 retry:
844 in6_dev_hold(idev);
845 if (idev->cnf.use_tempaddr <= 0) {
846 write_unlock(&idev->lock);
847 printk(KERN_INFO
848 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
849 in6_dev_put(idev);
850 ret = -1;
851 goto out;
852 }
853 spin_lock_bh(&ifp->lock);
854 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
855 idev->cnf.use_tempaddr = -1; /*XXX*/
856 spin_unlock_bh(&ifp->lock);
857 write_unlock(&idev->lock);
858 printk(KERN_WARNING
859 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
860 in6_dev_put(idev);
861 ret = -1;
862 goto out;
863 }
864 in6_ifa_hold(ifp);
865 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
866 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
867 spin_unlock_bh(&ifp->lock);
868 write_unlock(&idev->lock);
869 printk(KERN_WARNING
870 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
871 in6_ifa_put(ifp);
872 in6_dev_put(idev);
873 ret = -1;
874 goto out;
875 }
876 memcpy(&addr.s6_addr[8], idev->rndid, 8);
877 age = (jiffies - ifp->tstamp) / HZ;
878 tmp_valid_lft = min_t(__u32,
879 ifp->valid_lft,
880 idev->cnf.temp_valid_lft + age);
881 tmp_prefered_lft = min_t(__u32,
882 ifp->prefered_lft,
883 idev->cnf.temp_prefered_lft + age -
884 idev->cnf.max_desync_factor);
885 tmp_plen = ifp->prefix_len;
886 max_addresses = idev->cnf.max_addresses;
887 tmp_cstamp = ifp->cstamp;
888 tmp_tstamp = ifp->tstamp;
889 spin_unlock_bh(&ifp->lock);
890
891 regen_advance = idev->cnf.regen_max_retry *
892 idev->cnf.dad_transmits *
893 idev->nd_parms->retrans_time / HZ;
894 write_unlock(&idev->lock);
895
896 /* A temporary address is created only if this calculated Preferred
897 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
898 * an implementation must not create a temporary address with a zero
899 * Preferred Lifetime.
900 */
901 if (tmp_prefered_lft <= regen_advance) {
902 in6_ifa_put(ifp);
903 in6_dev_put(idev);
904 ret = -1;
905 goto out;
906 }
907
908 addr_flags = IFA_F_TEMPORARY;
909 /* set in addrconf_prefix_rcv() */
910 if (ifp->flags & IFA_F_OPTIMISTIC)
911 addr_flags |= IFA_F_OPTIMISTIC;
912
913 ift = !max_addresses ||
914 ipv6_count_addresses(idev) < max_addresses ?
915 ipv6_add_addr(idev, &addr, tmp_plen,
916 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
917 addr_flags) : NULL;
918 if (!ift || IS_ERR(ift)) {
919 in6_ifa_put(ifp);
920 in6_dev_put(idev);
921 printk(KERN_INFO
922 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
923 tmpaddr = &addr;
924 write_lock(&idev->lock);
925 goto retry;
926 }
927
928 spin_lock_bh(&ift->lock);
929 ift->ifpub = ifp;
930 ift->valid_lft = tmp_valid_lft;
931 ift->prefered_lft = tmp_prefered_lft;
932 ift->cstamp = tmp_cstamp;
933 ift->tstamp = tmp_tstamp;
934 spin_unlock_bh(&ift->lock);
935
936 addrconf_dad_start(ift, 0);
937 in6_ifa_put(ift);
938 in6_dev_put(idev);
939 out:
940 return ret;
941 }
942 #endif
943
944 /*
945 * Choose an appropriate source address (RFC3484)
946 */
947 enum {
948 IPV6_SADDR_RULE_INIT = 0,
949 IPV6_SADDR_RULE_LOCAL,
950 IPV6_SADDR_RULE_SCOPE,
951 IPV6_SADDR_RULE_PREFERRED,
952 #ifdef CONFIG_IPV6_MIP6
953 IPV6_SADDR_RULE_HOA,
954 #endif
955 IPV6_SADDR_RULE_OIF,
956 IPV6_SADDR_RULE_LABEL,
957 #ifdef CONFIG_IPV6_PRIVACY
958 IPV6_SADDR_RULE_PRIVACY,
959 #endif
960 IPV6_SADDR_RULE_ORCHID,
961 IPV6_SADDR_RULE_PREFIX,
962 IPV6_SADDR_RULE_MAX
963 };
964
965 struct ipv6_saddr_score {
966 int rule;
967 int addr_type;
968 struct inet6_ifaddr *ifa;
969 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
970 int scopedist;
971 int matchlen;
972 };
973
974 struct ipv6_saddr_dst {
975 const struct in6_addr *addr;
976 int ifindex;
977 int scope;
978 int label;
979 unsigned int prefs;
980 };
981
982 static inline int ipv6_saddr_preferred(int type)
983 {
984 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
985 return 1;
986 return 0;
987 }
988
989 static int ipv6_get_saddr_eval(struct net *net,
990 struct ipv6_saddr_score *score,
991 struct ipv6_saddr_dst *dst,
992 int i)
993 {
994 int ret;
995
996 if (i <= score->rule) {
997 switch (i) {
998 case IPV6_SADDR_RULE_SCOPE:
999 ret = score->scopedist;
1000 break;
1001 case IPV6_SADDR_RULE_PREFIX:
1002 ret = score->matchlen;
1003 break;
1004 default:
1005 ret = !!test_bit(i, score->scorebits);
1006 }
1007 goto out;
1008 }
1009
1010 switch (i) {
1011 case IPV6_SADDR_RULE_INIT:
1012 /* Rule 0: remember if hiscore is not ready yet */
1013 ret = !!score->ifa;
1014 break;
1015 case IPV6_SADDR_RULE_LOCAL:
1016 /* Rule 1: Prefer same address */
1017 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1018 break;
1019 case IPV6_SADDR_RULE_SCOPE:
1020 /* Rule 2: Prefer appropriate scope
1021 *
1022 * ret
1023 * ^
1024 * -1 | d 15
1025 * ---+--+-+---> scope
1026 * |
1027 * | d is scope of the destination.
1028 * B-d | \
1029 * | \ <- smaller scope is better if
1030 * B-15 | \ if scope is enough for destinaion.
1031 * | ret = B - scope (-1 <= scope >= d <= 15).
1032 * d-C-1 | /
1033 * |/ <- greater is better
1034 * -C / if scope is not enough for destination.
1035 * /| ret = scope - C (-1 <= d < scope <= 15).
1036 *
1037 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1038 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1039 * Assume B = 0 and we get C > 29.
1040 */
1041 ret = __ipv6_addr_src_scope(score->addr_type);
1042 if (ret >= dst->scope)
1043 ret = -ret;
1044 else
1045 ret -= 128; /* 30 is enough */
1046 score->scopedist = ret;
1047 break;
1048 case IPV6_SADDR_RULE_PREFERRED:
1049 /* Rule 3: Avoid deprecated and optimistic addresses */
1050 ret = ipv6_saddr_preferred(score->addr_type) ||
1051 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1052 break;
1053 #ifdef CONFIG_IPV6_MIP6
1054 case IPV6_SADDR_RULE_HOA:
1055 {
1056 /* Rule 4: Prefer home address */
1057 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1058 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1059 break;
1060 }
1061 #endif
1062 case IPV6_SADDR_RULE_OIF:
1063 /* Rule 5: Prefer outgoing interface */
1064 ret = (!dst->ifindex ||
1065 dst->ifindex == score->ifa->idev->dev->ifindex);
1066 break;
1067 case IPV6_SADDR_RULE_LABEL:
1068 /* Rule 6: Prefer matching label */
1069 ret = ipv6_addr_label(net,
1070 &score->ifa->addr, score->addr_type,
1071 score->ifa->idev->dev->ifindex) == dst->label;
1072 break;
1073 #ifdef CONFIG_IPV6_PRIVACY
1074 case IPV6_SADDR_RULE_PRIVACY:
1075 {
1076 /* Rule 7: Prefer public address
1077 * Note: prefer temporary address if use_tempaddr >= 2
1078 */
1079 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1080 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1081 score->ifa->idev->cnf.use_tempaddr >= 2;
1082 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1083 break;
1084 }
1085 #endif
1086 case IPV6_SADDR_RULE_ORCHID:
1087 /* Rule 8-: Prefer ORCHID vs ORCHID or
1088 * non-ORCHID vs non-ORCHID
1089 */
1090 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1091 ipv6_addr_orchid(dst->addr));
1092 break;
1093 case IPV6_SADDR_RULE_PREFIX:
1094 /* Rule 8: Use longest matching prefix */
1095 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr,
1096 dst->addr);
1097 break;
1098 default:
1099 ret = 0;
1100 }
1101
1102 if (ret)
1103 __set_bit(i, score->scorebits);
1104 score->rule = i;
1105 out:
1106 return ret;
1107 }
1108
1109 int ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev,
1110 const struct in6_addr *daddr, unsigned int prefs,
1111 struct in6_addr *saddr)
1112 {
1113 struct ipv6_saddr_score scores[2],
1114 *score = &scores[0], *hiscore = &scores[1];
1115 struct ipv6_saddr_dst dst;
1116 struct net_device *dev;
1117 int dst_type;
1118
1119 dst_type = __ipv6_addr_type(daddr);
1120 dst.addr = daddr;
1121 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1122 dst.scope = __ipv6_addr_src_scope(dst_type);
1123 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1124 dst.prefs = prefs;
1125
1126 hiscore->rule = -1;
1127 hiscore->ifa = NULL;
1128
1129 rcu_read_lock();
1130
1131 for_each_netdev_rcu(net, dev) {
1132 struct inet6_dev *idev;
1133
1134 /* Candidate Source Address (section 4)
1135 * - multicast and link-local destination address,
1136 * the set of candidate source address MUST only
1137 * include addresses assigned to interfaces
1138 * belonging to the same link as the outgoing
1139 * interface.
1140 * (- For site-local destination addresses, the
1141 * set of candidate source addresses MUST only
1142 * include addresses assigned to interfaces
1143 * belonging to the same site as the outgoing
1144 * interface.)
1145 */
1146 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1147 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1148 dst.ifindex && dev->ifindex != dst.ifindex)
1149 continue;
1150
1151 idev = __in6_dev_get(dev);
1152 if (!idev)
1153 continue;
1154
1155 read_lock_bh(&idev->lock);
1156 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1157 int i;
1158
1159 /*
1160 * - Tentative Address (RFC2462 section 5.4)
1161 * - A tentative address is not considered
1162 * "assigned to an interface" in the traditional
1163 * sense, unless it is also flagged as optimistic.
1164 * - Candidate Source Address (section 4)
1165 * - In any case, anycast addresses, multicast
1166 * addresses, and the unspecified address MUST
1167 * NOT be included in a candidate set.
1168 */
1169 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1170 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1171 continue;
1172
1173 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1174
1175 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1176 score->addr_type & IPV6_ADDR_MULTICAST)) {
1177 LIMIT_NETDEBUG(KERN_DEBUG
1178 "ADDRCONF: unspecified / multicast address "
1179 "assigned as unicast address on %s",
1180 dev->name);
1181 continue;
1182 }
1183
1184 score->rule = -1;
1185 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1186
1187 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1188 int minihiscore, miniscore;
1189
1190 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1191 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1192
1193 if (minihiscore > miniscore) {
1194 if (i == IPV6_SADDR_RULE_SCOPE &&
1195 score->scopedist > 0) {
1196 /*
1197 * special case:
1198 * each remaining entry
1199 * has too small (not enough)
1200 * scope, because ifa entries
1201 * are sorted by their scope
1202 * values.
1203 */
1204 goto try_nextdev;
1205 }
1206 break;
1207 } else if (minihiscore < miniscore) {
1208 if (hiscore->ifa)
1209 in6_ifa_put(hiscore->ifa);
1210
1211 in6_ifa_hold(score->ifa);
1212
1213 swap(hiscore, score);
1214
1215 /* restore our iterator */
1216 score->ifa = hiscore->ifa;
1217
1218 break;
1219 }
1220 }
1221 }
1222 try_nextdev:
1223 read_unlock_bh(&idev->lock);
1224 }
1225 rcu_read_unlock();
1226
1227 if (!hiscore->ifa)
1228 return -EADDRNOTAVAIL;
1229
1230 ipv6_addr_copy(saddr, &hiscore->ifa->addr);
1231 in6_ifa_put(hiscore->ifa);
1232 return 0;
1233 }
1234 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1235
1236 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1237 unsigned char banned_flags)
1238 {
1239 struct inet6_dev *idev;
1240 int err = -EADDRNOTAVAIL;
1241
1242 rcu_read_lock();
1243 idev = __in6_dev_get(dev);
1244 if (idev) {
1245 struct inet6_ifaddr *ifp;
1246
1247 read_lock_bh(&idev->lock);
1248 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1249 if (ifp->scope == IFA_LINK &&
1250 !(ifp->flags & banned_flags)) {
1251 ipv6_addr_copy(addr, &ifp->addr);
1252 err = 0;
1253 break;
1254 }
1255 }
1256 read_unlock_bh(&idev->lock);
1257 }
1258 rcu_read_unlock();
1259 return err;
1260 }
1261
1262 static int ipv6_count_addresses(struct inet6_dev *idev)
1263 {
1264 int cnt = 0;
1265 struct inet6_ifaddr *ifp;
1266
1267 read_lock_bh(&idev->lock);
1268 list_for_each_entry(ifp, &idev->addr_list, if_list)
1269 cnt++;
1270 read_unlock_bh(&idev->lock);
1271 return cnt;
1272 }
1273
1274 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1275 struct net_device *dev, int strict)
1276 {
1277 struct inet6_ifaddr *ifp;
1278 struct hlist_node *node;
1279 unsigned int hash = ipv6_addr_hash(addr);
1280
1281 rcu_read_lock_bh();
1282 hlist_for_each_entry_rcu(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1283 if (!net_eq(dev_net(ifp->idev->dev), net))
1284 continue;
1285 if (ipv6_addr_equal(&ifp->addr, addr) &&
1286 !(ifp->flags&IFA_F_TENTATIVE) &&
1287 (dev == NULL || ifp->idev->dev == dev ||
1288 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1289 rcu_read_unlock_bh();
1290 return 1;
1291 }
1292 }
1293
1294 rcu_read_unlock_bh();
1295 return 0;
1296 }
1297 EXPORT_SYMBOL(ipv6_chk_addr);
1298
1299 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1300 struct net_device *dev)
1301 {
1302 unsigned int hash = ipv6_addr_hash(addr);
1303 struct inet6_ifaddr *ifp;
1304 struct hlist_node *node;
1305
1306 hlist_for_each_entry(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1307 if (!net_eq(dev_net(ifp->idev->dev), net))
1308 continue;
1309 if (ipv6_addr_equal(&ifp->addr, addr)) {
1310 if (dev == NULL || ifp->idev->dev == dev)
1311 return true;
1312 }
1313 }
1314 return false;
1315 }
1316
1317 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1318 {
1319 struct inet6_dev *idev;
1320 struct inet6_ifaddr *ifa;
1321 int onlink;
1322
1323 onlink = 0;
1324 rcu_read_lock();
1325 idev = __in6_dev_get(dev);
1326 if (idev) {
1327 read_lock_bh(&idev->lock);
1328 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1329 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1330 ifa->prefix_len);
1331 if (onlink)
1332 break;
1333 }
1334 read_unlock_bh(&idev->lock);
1335 }
1336 rcu_read_unlock();
1337 return onlink;
1338 }
1339
1340 EXPORT_SYMBOL(ipv6_chk_prefix);
1341
1342 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1343 struct net_device *dev, int strict)
1344 {
1345 struct inet6_ifaddr *ifp, *result = NULL;
1346 unsigned int hash = ipv6_addr_hash(addr);
1347 struct hlist_node *node;
1348
1349 rcu_read_lock_bh();
1350 hlist_for_each_entry_rcu_bh(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1351 if (!net_eq(dev_net(ifp->idev->dev), net))
1352 continue;
1353 if (ipv6_addr_equal(&ifp->addr, addr)) {
1354 if (dev == NULL || ifp->idev->dev == dev ||
1355 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1356 result = ifp;
1357 in6_ifa_hold(ifp);
1358 break;
1359 }
1360 }
1361 }
1362 rcu_read_unlock_bh();
1363
1364 return result;
1365 }
1366
1367 /* Gets referenced address, destroys ifaddr */
1368
1369 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1370 {
1371 if (ifp->flags&IFA_F_PERMANENT) {
1372 spin_lock_bh(&ifp->lock);
1373 addrconf_del_timer(ifp);
1374 ifp->flags |= IFA_F_TENTATIVE;
1375 if (dad_failed)
1376 ifp->flags |= IFA_F_DADFAILED;
1377 spin_unlock_bh(&ifp->lock);
1378 if (dad_failed)
1379 ipv6_ifa_notify(0, ifp);
1380 in6_ifa_put(ifp);
1381 #ifdef CONFIG_IPV6_PRIVACY
1382 } else if (ifp->flags&IFA_F_TEMPORARY) {
1383 struct inet6_ifaddr *ifpub;
1384 spin_lock_bh(&ifp->lock);
1385 ifpub = ifp->ifpub;
1386 if (ifpub) {
1387 in6_ifa_hold(ifpub);
1388 spin_unlock_bh(&ifp->lock);
1389 ipv6_create_tempaddr(ifpub, ifp);
1390 in6_ifa_put(ifpub);
1391 } else {
1392 spin_unlock_bh(&ifp->lock);
1393 }
1394 ipv6_del_addr(ifp);
1395 #endif
1396 } else
1397 ipv6_del_addr(ifp);
1398 }
1399
1400 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1401 {
1402 int err = -ENOENT;
1403
1404 spin_lock(&ifp->state_lock);
1405 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1406 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1407 err = 0;
1408 }
1409 spin_unlock(&ifp->state_lock);
1410
1411 return err;
1412 }
1413
1414 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1415 {
1416 struct inet6_dev *idev = ifp->idev;
1417
1418 if (addrconf_dad_end(ifp)) {
1419 in6_ifa_put(ifp);
1420 return;
1421 }
1422
1423 if (net_ratelimit())
1424 printk(KERN_INFO "%s: IPv6 duplicate address %pI6c detected!\n",
1425 ifp->idev->dev->name, &ifp->addr);
1426
1427 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1428 struct in6_addr addr;
1429
1430 addr.s6_addr32[0] = htonl(0xfe800000);
1431 addr.s6_addr32[1] = 0;
1432
1433 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1434 ipv6_addr_equal(&ifp->addr, &addr)) {
1435 /* DAD failed for link-local based on MAC address */
1436 idev->cnf.disable_ipv6 = 1;
1437
1438 printk(KERN_INFO "%s: IPv6 being disabled!\n",
1439 ifp->idev->dev->name);
1440 }
1441 }
1442
1443 addrconf_dad_stop(ifp, 1);
1444 }
1445
1446 /* Join to solicited addr multicast group. */
1447
1448 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1449 {
1450 struct in6_addr maddr;
1451
1452 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1453 return;
1454
1455 addrconf_addr_solict_mult(addr, &maddr);
1456 ipv6_dev_mc_inc(dev, &maddr);
1457 }
1458
1459 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1460 {
1461 struct in6_addr maddr;
1462
1463 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1464 return;
1465
1466 addrconf_addr_solict_mult(addr, &maddr);
1467 __ipv6_dev_mc_dec(idev, &maddr);
1468 }
1469
1470 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1471 {
1472 struct in6_addr addr;
1473 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1474 if (ipv6_addr_any(&addr))
1475 return;
1476 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1477 }
1478
1479 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1480 {
1481 struct in6_addr addr;
1482 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1483 if (ipv6_addr_any(&addr))
1484 return;
1485 __ipv6_dev_ac_dec(ifp->idev, &addr);
1486 }
1487
1488 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1489 {
1490 if (dev->addr_len != ETH_ALEN)
1491 return -1;
1492 memcpy(eui, dev->dev_addr, 3);
1493 memcpy(eui + 5, dev->dev_addr + 3, 3);
1494
1495 /*
1496 * The zSeries OSA network cards can be shared among various
1497 * OS instances, but the OSA cards have only one MAC address.
1498 * This leads to duplicate address conflicts in conjunction
1499 * with IPv6 if more than one instance uses the same card.
1500 *
1501 * The driver for these cards can deliver a unique 16-bit
1502 * identifier for each instance sharing the same card. It is
1503 * placed instead of 0xFFFE in the interface identifier. The
1504 * "u" bit of the interface identifier is not inverted in this
1505 * case. Hence the resulting interface identifier has local
1506 * scope according to RFC2373.
1507 */
1508 if (dev->dev_id) {
1509 eui[3] = (dev->dev_id >> 8) & 0xFF;
1510 eui[4] = dev->dev_id & 0xFF;
1511 } else {
1512 eui[3] = 0xFF;
1513 eui[4] = 0xFE;
1514 eui[0] ^= 2;
1515 }
1516 return 0;
1517 }
1518
1519 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1520 {
1521 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1522 if (dev->addr_len != ARCNET_ALEN)
1523 return -1;
1524 memset(eui, 0, 7);
1525 eui[7] = *(u8*)dev->dev_addr;
1526 return 0;
1527 }
1528
1529 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1530 {
1531 if (dev->addr_len != INFINIBAND_ALEN)
1532 return -1;
1533 memcpy(eui, dev->dev_addr + 12, 8);
1534 eui[0] |= 2;
1535 return 0;
1536 }
1537
1538 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1539 {
1540 if (addr == 0)
1541 return -1;
1542 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1543 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1544 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1545 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1546 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1547 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1548 eui[1] = 0;
1549 eui[2] = 0x5E;
1550 eui[3] = 0xFE;
1551 memcpy(eui + 4, &addr, 4);
1552 return 0;
1553 }
1554
1555 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1556 {
1557 if (dev->priv_flags & IFF_ISATAP)
1558 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1559 return -1;
1560 }
1561
1562 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1563 {
1564 switch (dev->type) {
1565 case ARPHRD_ETHER:
1566 case ARPHRD_FDDI:
1567 case ARPHRD_IEEE802_TR:
1568 return addrconf_ifid_eui48(eui, dev);
1569 case ARPHRD_ARCNET:
1570 return addrconf_ifid_arcnet(eui, dev);
1571 case ARPHRD_INFINIBAND:
1572 return addrconf_ifid_infiniband(eui, dev);
1573 case ARPHRD_SIT:
1574 return addrconf_ifid_sit(eui, dev);
1575 }
1576 return -1;
1577 }
1578
1579 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1580 {
1581 int err = -1;
1582 struct inet6_ifaddr *ifp;
1583
1584 read_lock_bh(&idev->lock);
1585 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1586 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1587 memcpy(eui, ifp->addr.s6_addr+8, 8);
1588 err = 0;
1589 break;
1590 }
1591 }
1592 read_unlock_bh(&idev->lock);
1593 return err;
1594 }
1595
1596 #ifdef CONFIG_IPV6_PRIVACY
1597 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1598 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1599 {
1600 regen:
1601 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1602 idev->rndid[0] &= ~0x02;
1603
1604 /*
1605 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1606 * check if generated address is not inappropriate
1607 *
1608 * - Reserved subnet anycast (RFC 2526)
1609 * 11111101 11....11 1xxxxxxx
1610 * - ISATAP (RFC4214) 6.1
1611 * 00-00-5E-FE-xx-xx-xx-xx
1612 * - value 0
1613 * - XXX: already assigned to an address on the device
1614 */
1615 if (idev->rndid[0] == 0xfd &&
1616 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1617 (idev->rndid[7]&0x80))
1618 goto regen;
1619 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1620 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1621 goto regen;
1622 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1623 goto regen;
1624 }
1625
1626 return 0;
1627 }
1628
1629 static void ipv6_regen_rndid(unsigned long data)
1630 {
1631 struct inet6_dev *idev = (struct inet6_dev *) data;
1632 unsigned long expires;
1633
1634 rcu_read_lock_bh();
1635 write_lock_bh(&idev->lock);
1636
1637 if (idev->dead)
1638 goto out;
1639
1640 if (__ipv6_regen_rndid(idev) < 0)
1641 goto out;
1642
1643 expires = jiffies +
1644 idev->cnf.temp_prefered_lft * HZ -
1645 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time -
1646 idev->cnf.max_desync_factor * HZ;
1647 if (time_before(expires, jiffies)) {
1648 printk(KERN_WARNING
1649 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1650 idev->dev->name);
1651 goto out;
1652 }
1653
1654 if (!mod_timer(&idev->regen_timer, expires))
1655 in6_dev_hold(idev);
1656
1657 out:
1658 write_unlock_bh(&idev->lock);
1659 rcu_read_unlock_bh();
1660 in6_dev_put(idev);
1661 }
1662
1663 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1664 int ret = 0;
1665
1666 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1667 ret = __ipv6_regen_rndid(idev);
1668 return ret;
1669 }
1670 #endif
1671
1672 /*
1673 * Add prefix route.
1674 */
1675
1676 static void
1677 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1678 unsigned long expires, u32 flags)
1679 {
1680 struct fib6_config cfg = {
1681 .fc_table = RT6_TABLE_PREFIX,
1682 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1683 .fc_ifindex = dev->ifindex,
1684 .fc_expires = expires,
1685 .fc_dst_len = plen,
1686 .fc_flags = RTF_UP | flags,
1687 .fc_nlinfo.nl_net = dev_net(dev),
1688 .fc_protocol = RTPROT_KERNEL,
1689 };
1690
1691 ipv6_addr_copy(&cfg.fc_dst, pfx);
1692
1693 /* Prevent useless cloning on PtP SIT.
1694 This thing is done here expecting that the whole
1695 class of non-broadcast devices need not cloning.
1696 */
1697 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1698 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1699 cfg.fc_flags |= RTF_NONEXTHOP;
1700 #endif
1701
1702 ip6_route_add(&cfg);
1703 }
1704
1705 /* Create "default" multicast route to the interface */
1706
1707 static void addrconf_add_mroute(struct net_device *dev)
1708 {
1709 struct fib6_config cfg = {
1710 .fc_table = RT6_TABLE_LOCAL,
1711 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1712 .fc_ifindex = dev->ifindex,
1713 .fc_dst_len = 8,
1714 .fc_flags = RTF_UP,
1715 .fc_nlinfo.nl_net = dev_net(dev),
1716 };
1717
1718 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1719
1720 ip6_route_add(&cfg);
1721 }
1722
1723 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1724 static void sit_route_add(struct net_device *dev)
1725 {
1726 struct fib6_config cfg = {
1727 .fc_table = RT6_TABLE_MAIN,
1728 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1729 .fc_ifindex = dev->ifindex,
1730 .fc_dst_len = 96,
1731 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1732 .fc_nlinfo.nl_net = dev_net(dev),
1733 };
1734
1735 /* prefix length - 96 bits "::d.d.d.d" */
1736 ip6_route_add(&cfg);
1737 }
1738 #endif
1739
1740 static void addrconf_add_lroute(struct net_device *dev)
1741 {
1742 struct in6_addr addr;
1743
1744 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1745 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1746 }
1747
1748 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1749 {
1750 struct inet6_dev *idev;
1751
1752 ASSERT_RTNL();
1753
1754 idev = ipv6_find_idev(dev);
1755 if (!idev)
1756 return ERR_PTR(-ENOBUFS);
1757
1758 if (idev->cnf.disable_ipv6)
1759 return ERR_PTR(-EACCES);
1760
1761 /* Add default multicast route */
1762 addrconf_add_mroute(dev);
1763
1764 /* Add link local route */
1765 addrconf_add_lroute(dev);
1766 return idev;
1767 }
1768
1769 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1770 {
1771 struct prefix_info *pinfo;
1772 __u32 valid_lft;
1773 __u32 prefered_lft;
1774 int addr_type;
1775 struct inet6_dev *in6_dev;
1776 struct net *net = dev_net(dev);
1777
1778 pinfo = (struct prefix_info *) opt;
1779
1780 if (len < sizeof(struct prefix_info)) {
1781 ADBG(("addrconf: prefix option too short\n"));
1782 return;
1783 }
1784
1785 /*
1786 * Validation checks ([ADDRCONF], page 19)
1787 */
1788
1789 addr_type = ipv6_addr_type(&pinfo->prefix);
1790
1791 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1792 return;
1793
1794 valid_lft = ntohl(pinfo->valid);
1795 prefered_lft = ntohl(pinfo->prefered);
1796
1797 if (prefered_lft > valid_lft) {
1798 if (net_ratelimit())
1799 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1800 return;
1801 }
1802
1803 in6_dev = in6_dev_get(dev);
1804
1805 if (in6_dev == NULL) {
1806 if (net_ratelimit())
1807 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1808 return;
1809 }
1810
1811 /*
1812 * Two things going on here:
1813 * 1) Add routes for on-link prefixes
1814 * 2) Configure prefixes with the auto flag set
1815 */
1816
1817 if (pinfo->onlink) {
1818 struct rt6_info *rt;
1819 unsigned long rt_expires;
1820
1821 /* Avoid arithmetic overflow. Really, we could
1822 * save rt_expires in seconds, likely valid_lft,
1823 * but it would require division in fib gc, that it
1824 * not good.
1825 */
1826 if (HZ > USER_HZ)
1827 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
1828 else
1829 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
1830
1831 if (addrconf_finite_timeout(rt_expires))
1832 rt_expires *= HZ;
1833
1834 rt = rt6_lookup(net, &pinfo->prefix, NULL,
1835 dev->ifindex, 1);
1836
1837 if (rt && addrconf_is_prefix_route(rt)) {
1838 /* Autoconf prefix route */
1839 if (valid_lft == 0) {
1840 ip6_del_rt(rt);
1841 rt = NULL;
1842 } else if (addrconf_finite_timeout(rt_expires)) {
1843 /* not infinity */
1844 rt->rt6i_expires = jiffies + rt_expires;
1845 rt->rt6i_flags |= RTF_EXPIRES;
1846 } else {
1847 rt->rt6i_flags &= ~RTF_EXPIRES;
1848 rt->rt6i_expires = 0;
1849 }
1850 } else if (valid_lft) {
1851 clock_t expires = 0;
1852 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
1853 if (addrconf_finite_timeout(rt_expires)) {
1854 /* not infinity */
1855 flags |= RTF_EXPIRES;
1856 expires = jiffies_to_clock_t(rt_expires);
1857 }
1858 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1859 dev, expires, flags);
1860 }
1861 if (rt)
1862 dst_release(&rt->dst);
1863 }
1864
1865 /* Try to figure out our local address for this prefix */
1866
1867 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1868 struct inet6_ifaddr * ifp;
1869 struct in6_addr addr;
1870 int create = 0, update_lft = 0;
1871
1872 if (pinfo->prefix_len == 64) {
1873 memcpy(&addr, &pinfo->prefix, 8);
1874 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1875 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1876 in6_dev_put(in6_dev);
1877 return;
1878 }
1879 goto ok;
1880 }
1881 if (net_ratelimit())
1882 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1883 pinfo->prefix_len);
1884 in6_dev_put(in6_dev);
1885 return;
1886
1887 ok:
1888
1889 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1890
1891 if (ifp == NULL && valid_lft) {
1892 int max_addresses = in6_dev->cnf.max_addresses;
1893 u32 addr_flags = 0;
1894
1895 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1896 if (in6_dev->cnf.optimistic_dad &&
1897 !net->ipv6.devconf_all->forwarding)
1898 addr_flags = IFA_F_OPTIMISTIC;
1899 #endif
1900
1901 /* Do not allow to create too much of autoconfigured
1902 * addresses; this would be too easy way to crash kernel.
1903 */
1904 if (!max_addresses ||
1905 ipv6_count_addresses(in6_dev) < max_addresses)
1906 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1907 addr_type&IPV6_ADDR_SCOPE_MASK,
1908 addr_flags);
1909
1910 if (!ifp || IS_ERR(ifp)) {
1911 in6_dev_put(in6_dev);
1912 return;
1913 }
1914
1915 update_lft = create = 1;
1916 ifp->cstamp = jiffies;
1917 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1918 }
1919
1920 if (ifp) {
1921 int flags;
1922 unsigned long now;
1923 #ifdef CONFIG_IPV6_PRIVACY
1924 struct inet6_ifaddr *ift;
1925 #endif
1926 u32 stored_lft;
1927
1928 /* update lifetime (RFC2462 5.5.3 e) */
1929 spin_lock(&ifp->lock);
1930 now = jiffies;
1931 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1932 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1933 else
1934 stored_lft = 0;
1935 if (!update_lft && stored_lft) {
1936 if (valid_lft > MIN_VALID_LIFETIME ||
1937 valid_lft > stored_lft)
1938 update_lft = 1;
1939 else if (stored_lft <= MIN_VALID_LIFETIME) {
1940 /* valid_lft <= stored_lft is always true */
1941 /*
1942 * RFC 4862 Section 5.5.3e:
1943 * "Note that the preferred lifetime of
1944 * the corresponding address is always
1945 * reset to the Preferred Lifetime in
1946 * the received Prefix Information
1947 * option, regardless of whether the
1948 * valid lifetime is also reset or
1949 * ignored."
1950 *
1951 * So if the preferred lifetime in
1952 * this advertisement is different
1953 * than what we have stored, but the
1954 * valid lifetime is invalid, just
1955 * reset prefered_lft.
1956 *
1957 * We must set the valid lifetime
1958 * to the stored lifetime since we'll
1959 * be updating the timestamp below,
1960 * else we'll set it back to the
1961 * minimum.
1962 */
1963 if (prefered_lft != ifp->prefered_lft) {
1964 valid_lft = stored_lft;
1965 update_lft = 1;
1966 }
1967 } else {
1968 valid_lft = MIN_VALID_LIFETIME;
1969 if (valid_lft < prefered_lft)
1970 prefered_lft = valid_lft;
1971 update_lft = 1;
1972 }
1973 }
1974
1975 if (update_lft) {
1976 ifp->valid_lft = valid_lft;
1977 ifp->prefered_lft = prefered_lft;
1978 ifp->tstamp = now;
1979 flags = ifp->flags;
1980 ifp->flags &= ~IFA_F_DEPRECATED;
1981 spin_unlock(&ifp->lock);
1982
1983 if (!(flags&IFA_F_TENTATIVE))
1984 ipv6_ifa_notify(0, ifp);
1985 } else
1986 spin_unlock(&ifp->lock);
1987
1988 #ifdef CONFIG_IPV6_PRIVACY
1989 read_lock_bh(&in6_dev->lock);
1990 /* update all temporary addresses in the list */
1991 list_for_each_entry(ift, &in6_dev->tempaddr_list, tmp_list) {
1992 /*
1993 * When adjusting the lifetimes of an existing
1994 * temporary address, only lower the lifetimes.
1995 * Implementations must not increase the
1996 * lifetimes of an existing temporary address
1997 * when processing a Prefix Information Option.
1998 */
1999 if (ifp != ift->ifpub)
2000 continue;
2001
2002 spin_lock(&ift->lock);
2003 flags = ift->flags;
2004 if (ift->valid_lft > valid_lft &&
2005 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
2006 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
2007 if (ift->prefered_lft > prefered_lft &&
2008 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
2009 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
2010 spin_unlock(&ift->lock);
2011 if (!(flags&IFA_F_TENTATIVE))
2012 ipv6_ifa_notify(0, ift);
2013 }
2014
2015 if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) {
2016 /*
2017 * When a new public address is created as described in [ADDRCONF],
2018 * also create a new temporary address. Also create a temporary
2019 * address if it's enabled but no temporary address currently exists.
2020 */
2021 read_unlock_bh(&in6_dev->lock);
2022 ipv6_create_tempaddr(ifp, NULL);
2023 } else {
2024 read_unlock_bh(&in6_dev->lock);
2025 }
2026 #endif
2027 in6_ifa_put(ifp);
2028 addrconf_verify(0);
2029 }
2030 }
2031 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2032 in6_dev_put(in6_dev);
2033 }
2034
2035 /*
2036 * Set destination address.
2037 * Special case for SIT interfaces where we create a new "virtual"
2038 * device.
2039 */
2040 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2041 {
2042 struct in6_ifreq ireq;
2043 struct net_device *dev;
2044 int err = -EINVAL;
2045
2046 rtnl_lock();
2047
2048 err = -EFAULT;
2049 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2050 goto err_exit;
2051
2052 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2053
2054 err = -ENODEV;
2055 if (dev == NULL)
2056 goto err_exit;
2057
2058 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2059 if (dev->type == ARPHRD_SIT) {
2060 const struct net_device_ops *ops = dev->netdev_ops;
2061 struct ifreq ifr;
2062 struct ip_tunnel_parm p;
2063
2064 err = -EADDRNOTAVAIL;
2065 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2066 goto err_exit;
2067
2068 memset(&p, 0, sizeof(p));
2069 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2070 p.iph.saddr = 0;
2071 p.iph.version = 4;
2072 p.iph.ihl = 5;
2073 p.iph.protocol = IPPROTO_IPV6;
2074 p.iph.ttl = 64;
2075 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2076
2077 if (ops->ndo_do_ioctl) {
2078 mm_segment_t oldfs = get_fs();
2079
2080 set_fs(KERNEL_DS);
2081 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2082 set_fs(oldfs);
2083 } else
2084 err = -EOPNOTSUPP;
2085
2086 if (err == 0) {
2087 err = -ENOBUFS;
2088 dev = __dev_get_by_name(net, p.name);
2089 if (!dev)
2090 goto err_exit;
2091 err = dev_open(dev);
2092 }
2093 }
2094 #endif
2095
2096 err_exit:
2097 rtnl_unlock();
2098 return err;
2099 }
2100
2101 /*
2102 * Manual configuration of address on an interface
2103 */
2104 static int inet6_addr_add(struct net *net, int ifindex, const struct in6_addr *pfx,
2105 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
2106 __u32 valid_lft)
2107 {
2108 struct inet6_ifaddr *ifp;
2109 struct inet6_dev *idev;
2110 struct net_device *dev;
2111 int scope;
2112 u32 flags;
2113 clock_t expires;
2114 unsigned long timeout;
2115
2116 ASSERT_RTNL();
2117
2118 if (plen > 128)
2119 return -EINVAL;
2120
2121 /* check the lifetime */
2122 if (!valid_lft || prefered_lft > valid_lft)
2123 return -EINVAL;
2124
2125 dev = __dev_get_by_index(net, ifindex);
2126 if (!dev)
2127 return -ENODEV;
2128
2129 idev = addrconf_add_dev(dev);
2130 if (IS_ERR(idev))
2131 return PTR_ERR(idev);
2132
2133 scope = ipv6_addr_scope(pfx);
2134
2135 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2136 if (addrconf_finite_timeout(timeout)) {
2137 expires = jiffies_to_clock_t(timeout * HZ);
2138 valid_lft = timeout;
2139 flags = RTF_EXPIRES;
2140 } else {
2141 expires = 0;
2142 flags = 0;
2143 ifa_flags |= IFA_F_PERMANENT;
2144 }
2145
2146 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2147 if (addrconf_finite_timeout(timeout)) {
2148 if (timeout == 0)
2149 ifa_flags |= IFA_F_DEPRECATED;
2150 prefered_lft = timeout;
2151 }
2152
2153 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2154
2155 if (!IS_ERR(ifp)) {
2156 spin_lock_bh(&ifp->lock);
2157 ifp->valid_lft = valid_lft;
2158 ifp->prefered_lft = prefered_lft;
2159 ifp->tstamp = jiffies;
2160 spin_unlock_bh(&ifp->lock);
2161
2162 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2163 expires, flags);
2164 /*
2165 * Note that section 3.1 of RFC 4429 indicates
2166 * that the Optimistic flag should not be set for
2167 * manually configured addresses
2168 */
2169 addrconf_dad_start(ifp, 0);
2170 in6_ifa_put(ifp);
2171 addrconf_verify(0);
2172 return 0;
2173 }
2174
2175 return PTR_ERR(ifp);
2176 }
2177
2178 static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx,
2179 unsigned int plen)
2180 {
2181 struct inet6_ifaddr *ifp;
2182 struct inet6_dev *idev;
2183 struct net_device *dev;
2184
2185 if (plen > 128)
2186 return -EINVAL;
2187
2188 dev = __dev_get_by_index(net, ifindex);
2189 if (!dev)
2190 return -ENODEV;
2191
2192 if ((idev = __in6_dev_get(dev)) == NULL)
2193 return -ENXIO;
2194
2195 read_lock_bh(&idev->lock);
2196 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2197 if (ifp->prefix_len == plen &&
2198 ipv6_addr_equal(pfx, &ifp->addr)) {
2199 in6_ifa_hold(ifp);
2200 read_unlock_bh(&idev->lock);
2201
2202 ipv6_del_addr(ifp);
2203
2204 /* If the last address is deleted administratively,
2205 disable IPv6 on this interface.
2206 */
2207 if (list_empty(&idev->addr_list))
2208 addrconf_ifdown(idev->dev, 1);
2209 return 0;
2210 }
2211 }
2212 read_unlock_bh(&idev->lock);
2213 return -EADDRNOTAVAIL;
2214 }
2215
2216
2217 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2218 {
2219 struct in6_ifreq ireq;
2220 int err;
2221
2222 if (!capable(CAP_NET_ADMIN))
2223 return -EPERM;
2224
2225 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2226 return -EFAULT;
2227
2228 rtnl_lock();
2229 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2230 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2231 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2232 rtnl_unlock();
2233 return err;
2234 }
2235
2236 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2237 {
2238 struct in6_ifreq ireq;
2239 int err;
2240
2241 if (!capable(CAP_NET_ADMIN))
2242 return -EPERM;
2243
2244 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2245 return -EFAULT;
2246
2247 rtnl_lock();
2248 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2249 ireq.ifr6_prefixlen);
2250 rtnl_unlock();
2251 return err;
2252 }
2253
2254 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2255 int plen, int scope)
2256 {
2257 struct inet6_ifaddr *ifp;
2258
2259 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT);
2260 if (!IS_ERR(ifp)) {
2261 spin_lock_bh(&ifp->lock);
2262 ifp->flags &= ~IFA_F_TENTATIVE;
2263 spin_unlock_bh(&ifp->lock);
2264 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2265 in6_ifa_put(ifp);
2266 }
2267 }
2268
2269 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2270 static void sit_add_v4_addrs(struct inet6_dev *idev)
2271 {
2272 struct in6_addr addr;
2273 struct net_device *dev;
2274 struct net *net = dev_net(idev->dev);
2275 int scope;
2276
2277 ASSERT_RTNL();
2278
2279 memset(&addr, 0, sizeof(struct in6_addr));
2280 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2281
2282 if (idev->dev->flags&IFF_POINTOPOINT) {
2283 addr.s6_addr32[0] = htonl(0xfe800000);
2284 scope = IFA_LINK;
2285 } else {
2286 scope = IPV6_ADDR_COMPATv4;
2287 }
2288
2289 if (addr.s6_addr32[3]) {
2290 add_addr(idev, &addr, 128, scope);
2291 return;
2292 }
2293
2294 for_each_netdev(net, dev) {
2295 struct in_device * in_dev = __in_dev_get_rtnl(dev);
2296 if (in_dev && (dev->flags & IFF_UP)) {
2297 struct in_ifaddr * ifa;
2298
2299 int flag = scope;
2300
2301 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2302 int plen;
2303
2304 addr.s6_addr32[3] = ifa->ifa_local;
2305
2306 if (ifa->ifa_scope == RT_SCOPE_LINK)
2307 continue;
2308 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2309 if (idev->dev->flags&IFF_POINTOPOINT)
2310 continue;
2311 flag |= IFA_HOST;
2312 }
2313 if (idev->dev->flags&IFF_POINTOPOINT)
2314 plen = 64;
2315 else
2316 plen = 96;
2317
2318 add_addr(idev, &addr, plen, flag);
2319 }
2320 }
2321 }
2322 }
2323 #endif
2324
2325 static void init_loopback(struct net_device *dev)
2326 {
2327 struct inet6_dev *idev;
2328
2329 /* ::1 */
2330
2331 ASSERT_RTNL();
2332
2333 if ((idev = ipv6_find_idev(dev)) == NULL) {
2334 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2335 return;
2336 }
2337
2338 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2339 }
2340
2341 static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr)
2342 {
2343 struct inet6_ifaddr * ifp;
2344 u32 addr_flags = IFA_F_PERMANENT;
2345
2346 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2347 if (idev->cnf.optimistic_dad &&
2348 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2349 addr_flags |= IFA_F_OPTIMISTIC;
2350 #endif
2351
2352
2353 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2354 if (!IS_ERR(ifp)) {
2355 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2356 addrconf_dad_start(ifp, 0);
2357 in6_ifa_put(ifp);
2358 }
2359 }
2360
2361 static void addrconf_dev_config(struct net_device *dev)
2362 {
2363 struct in6_addr addr;
2364 struct inet6_dev * idev;
2365
2366 ASSERT_RTNL();
2367
2368 if ((dev->type != ARPHRD_ETHER) &&
2369 (dev->type != ARPHRD_FDDI) &&
2370 (dev->type != ARPHRD_IEEE802_TR) &&
2371 (dev->type != ARPHRD_ARCNET) &&
2372 (dev->type != ARPHRD_INFINIBAND)) {
2373 /* Alas, we support only Ethernet autoconfiguration. */
2374 return;
2375 }
2376
2377 idev = addrconf_add_dev(dev);
2378 if (IS_ERR(idev))
2379 return;
2380
2381 memset(&addr, 0, sizeof(struct in6_addr));
2382 addr.s6_addr32[0] = htonl(0xFE800000);
2383
2384 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2385 addrconf_add_linklocal(idev, &addr);
2386 }
2387
2388 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2389 static void addrconf_sit_config(struct net_device *dev)
2390 {
2391 struct inet6_dev *idev;
2392
2393 ASSERT_RTNL();
2394
2395 /*
2396 * Configure the tunnel with one of our IPv4
2397 * addresses... we should configure all of
2398 * our v4 addrs in the tunnel
2399 */
2400
2401 if ((idev = ipv6_find_idev(dev)) == NULL) {
2402 printk(KERN_DEBUG "init sit: add_dev failed\n");
2403 return;
2404 }
2405
2406 if (dev->priv_flags & IFF_ISATAP) {
2407 struct in6_addr addr;
2408
2409 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2410 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2411 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2412 addrconf_add_linklocal(idev, &addr);
2413 return;
2414 }
2415
2416 sit_add_v4_addrs(idev);
2417
2418 if (dev->flags&IFF_POINTOPOINT) {
2419 addrconf_add_mroute(dev);
2420 addrconf_add_lroute(dev);
2421 } else
2422 sit_route_add(dev);
2423 }
2424 #endif
2425
2426 static inline int
2427 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2428 {
2429 struct in6_addr lladdr;
2430
2431 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2432 addrconf_add_linklocal(idev, &lladdr);
2433 return 0;
2434 }
2435 return -1;
2436 }
2437
2438 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2439 {
2440 struct net_device *link_dev;
2441 struct net *net = dev_net(idev->dev);
2442
2443 /* first try to inherit the link-local address from the link device */
2444 if (idev->dev->iflink &&
2445 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
2446 if (!ipv6_inherit_linklocal(idev, link_dev))
2447 return;
2448 }
2449 /* then try to inherit it from any device */
2450 for_each_netdev(net, link_dev) {
2451 if (!ipv6_inherit_linklocal(idev, link_dev))
2452 return;
2453 }
2454 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2455 }
2456
2457 /*
2458 * Autoconfigure tunnel with a link-local address so routing protocols,
2459 * DHCPv6, MLD etc. can be run over the virtual link
2460 */
2461
2462 static void addrconf_ip6_tnl_config(struct net_device *dev)
2463 {
2464 struct inet6_dev *idev;
2465
2466 ASSERT_RTNL();
2467
2468 idev = addrconf_add_dev(dev);
2469 if (IS_ERR(idev)) {
2470 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2471 return;
2472 }
2473 ip6_tnl_add_linklocal(idev);
2474 }
2475
2476 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2477 void * data)
2478 {
2479 struct net_device *dev = (struct net_device *) data;
2480 struct inet6_dev *idev = __in6_dev_get(dev);
2481 int run_pending = 0;
2482 int err;
2483
2484 switch (event) {
2485 case NETDEV_REGISTER:
2486 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2487 idev = ipv6_add_dev(dev);
2488 if (!idev)
2489 return notifier_from_errno(-ENOMEM);
2490 }
2491 break;
2492
2493 case NETDEV_UP:
2494 case NETDEV_CHANGE:
2495 if (dev->flags & IFF_SLAVE)
2496 break;
2497
2498 if (event == NETDEV_UP) {
2499 if (!addrconf_qdisc_ok(dev)) {
2500 /* device is not ready yet. */
2501 printk(KERN_INFO
2502 "ADDRCONF(NETDEV_UP): %s: "
2503 "link is not ready\n",
2504 dev->name);
2505 break;
2506 }
2507
2508 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2509 idev = ipv6_add_dev(dev);
2510
2511 if (idev) {
2512 idev->if_flags |= IF_READY;
2513 run_pending = 1;
2514 }
2515 } else {
2516 if (!addrconf_qdisc_ok(dev)) {
2517 /* device is still not ready. */
2518 break;
2519 }
2520
2521 if (idev) {
2522 if (idev->if_flags & IF_READY)
2523 /* device is already configured. */
2524 break;
2525 idev->if_flags |= IF_READY;
2526 }
2527
2528 printk(KERN_INFO
2529 "ADDRCONF(NETDEV_CHANGE): %s: "
2530 "link becomes ready\n",
2531 dev->name);
2532
2533 run_pending = 1;
2534 }
2535
2536 switch (dev->type) {
2537 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2538 case ARPHRD_SIT:
2539 addrconf_sit_config(dev);
2540 break;
2541 #endif
2542 case ARPHRD_TUNNEL6:
2543 addrconf_ip6_tnl_config(dev);
2544 break;
2545 case ARPHRD_LOOPBACK:
2546 init_loopback(dev);
2547 break;
2548
2549 default:
2550 addrconf_dev_config(dev);
2551 break;
2552 }
2553
2554 if (idev) {
2555 if (run_pending)
2556 addrconf_dad_run(idev);
2557
2558 /*
2559 * If the MTU changed during the interface down,
2560 * when the interface up, the changed MTU must be
2561 * reflected in the idev as well as routers.
2562 */
2563 if (idev->cnf.mtu6 != dev->mtu &&
2564 dev->mtu >= IPV6_MIN_MTU) {
2565 rt6_mtu_change(dev, dev->mtu);
2566 idev->cnf.mtu6 = dev->mtu;
2567 }
2568 idev->tstamp = jiffies;
2569 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2570
2571 /*
2572 * If the changed mtu during down is lower than
2573 * IPV6_MIN_MTU stop IPv6 on this interface.
2574 */
2575 if (dev->mtu < IPV6_MIN_MTU)
2576 addrconf_ifdown(dev, 1);
2577 }
2578 break;
2579
2580 case NETDEV_CHANGEMTU:
2581 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2582 rt6_mtu_change(dev, dev->mtu);
2583 idev->cnf.mtu6 = dev->mtu;
2584 break;
2585 }
2586
2587 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2588 idev = ipv6_add_dev(dev);
2589 if (idev)
2590 break;
2591 }
2592
2593 /*
2594 * MTU falled under IPV6_MIN_MTU.
2595 * Stop IPv6 on this interface.
2596 */
2597
2598 case NETDEV_DOWN:
2599 case NETDEV_UNREGISTER:
2600 /*
2601 * Remove all addresses from this interface.
2602 */
2603 addrconf_ifdown(dev, event != NETDEV_DOWN);
2604 break;
2605
2606 case NETDEV_CHANGENAME:
2607 if (idev) {
2608 snmp6_unregister_dev(idev);
2609 addrconf_sysctl_unregister(idev);
2610 addrconf_sysctl_register(idev);
2611 err = snmp6_register_dev(idev);
2612 if (err)
2613 return notifier_from_errno(err);
2614 }
2615 break;
2616
2617 case NETDEV_PRE_TYPE_CHANGE:
2618 case NETDEV_POST_TYPE_CHANGE:
2619 addrconf_type_change(dev, event);
2620 break;
2621 }
2622
2623 return NOTIFY_OK;
2624 }
2625
2626 /*
2627 * addrconf module should be notified of a device going up
2628 */
2629 static struct notifier_block ipv6_dev_notf = {
2630 .notifier_call = addrconf_notify,
2631 };
2632
2633 static void addrconf_type_change(struct net_device *dev, unsigned long event)
2634 {
2635 struct inet6_dev *idev;
2636 ASSERT_RTNL();
2637
2638 idev = __in6_dev_get(dev);
2639
2640 if (event == NETDEV_POST_TYPE_CHANGE)
2641 ipv6_mc_remap(idev);
2642 else if (event == NETDEV_PRE_TYPE_CHANGE)
2643 ipv6_mc_unmap(idev);
2644 }
2645
2646 static int addrconf_ifdown(struct net_device *dev, int how)
2647 {
2648 struct net *net = dev_net(dev);
2649 struct inet6_dev *idev;
2650 struct inet6_ifaddr *ifa;
2651 int state, i;
2652
2653 ASSERT_RTNL();
2654
2655 rt6_ifdown(net, dev);
2656 neigh_ifdown(&nd_tbl, dev);
2657
2658 idev = __in6_dev_get(dev);
2659 if (idev == NULL)
2660 return -ENODEV;
2661
2662 /*
2663 * Step 1: remove reference to ipv6 device from parent device.
2664 * Do not dev_put!
2665 */
2666 if (how) {
2667 idev->dead = 1;
2668
2669 /* protected by rtnl_lock */
2670 rcu_assign_pointer(dev->ip6_ptr, NULL);
2671
2672 /* Step 1.5: remove snmp6 entry */
2673 snmp6_unregister_dev(idev);
2674
2675 }
2676
2677 /* Step 2: clear hash table */
2678 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
2679 struct hlist_head *h = &inet6_addr_lst[i];
2680 struct hlist_node *n;
2681
2682 spin_lock_bh(&addrconf_hash_lock);
2683 restart:
2684 hlist_for_each_entry_rcu(ifa, n, h, addr_lst) {
2685 if (ifa->idev == idev) {
2686 hlist_del_init_rcu(&ifa->addr_lst);
2687 addrconf_del_timer(ifa);
2688 goto restart;
2689 }
2690 }
2691 spin_unlock_bh(&addrconf_hash_lock);
2692 }
2693
2694 write_lock_bh(&idev->lock);
2695
2696 /* Step 2: clear flags for stateless addrconf */
2697 if (!how)
2698 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2699
2700 #ifdef CONFIG_IPV6_PRIVACY
2701 if (how && del_timer(&idev->regen_timer))
2702 in6_dev_put(idev);
2703
2704 /* Step 3: clear tempaddr list */
2705 while (!list_empty(&idev->tempaddr_list)) {
2706 ifa = list_first_entry(&idev->tempaddr_list,
2707 struct inet6_ifaddr, tmp_list);
2708 list_del(&ifa->tmp_list);
2709 write_unlock_bh(&idev->lock);
2710 spin_lock_bh(&ifa->lock);
2711
2712 if (ifa->ifpub) {
2713 in6_ifa_put(ifa->ifpub);
2714 ifa->ifpub = NULL;
2715 }
2716 spin_unlock_bh(&ifa->lock);
2717 in6_ifa_put(ifa);
2718 write_lock_bh(&idev->lock);
2719 }
2720 #endif
2721
2722 while (!list_empty(&idev->addr_list)) {
2723 ifa = list_first_entry(&idev->addr_list,
2724 struct inet6_ifaddr, if_list);
2725 addrconf_del_timer(ifa);
2726
2727 list_del(&ifa->if_list);
2728
2729 write_unlock_bh(&idev->lock);
2730
2731 spin_lock_bh(&ifa->state_lock);
2732 state = ifa->state;
2733 ifa->state = INET6_IFADDR_STATE_DEAD;
2734 spin_unlock_bh(&ifa->state_lock);
2735
2736 if (state != INET6_IFADDR_STATE_DEAD) {
2737 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2738 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2739 }
2740 in6_ifa_put(ifa);
2741
2742 write_lock_bh(&idev->lock);
2743 }
2744
2745 write_unlock_bh(&idev->lock);
2746
2747 /* Step 5: Discard multicast list */
2748 if (how)
2749 ipv6_mc_destroy_dev(idev);
2750 else
2751 ipv6_mc_down(idev);
2752
2753 idev->tstamp = jiffies;
2754
2755 /* Last: Shot the device (if unregistered) */
2756 if (how) {
2757 addrconf_sysctl_unregister(idev);
2758 neigh_parms_release(&nd_tbl, idev->nd_parms);
2759 neigh_ifdown(&nd_tbl, dev);
2760 in6_dev_put(idev);
2761 }
2762 return 0;
2763 }
2764
2765 static void addrconf_rs_timer(unsigned long data)
2766 {
2767 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2768 struct inet6_dev *idev = ifp->idev;
2769
2770 read_lock(&idev->lock);
2771 if (idev->dead || !(idev->if_flags & IF_READY))
2772 goto out;
2773
2774 if (idev->cnf.forwarding)
2775 goto out;
2776
2777 /* Announcement received after solicitation was sent */
2778 if (idev->if_flags & IF_RA_RCVD)
2779 goto out;
2780
2781 spin_lock(&ifp->lock);
2782 if (ifp->probes++ < idev->cnf.rtr_solicits) {
2783 /* The wait after the last probe can be shorter */
2784 addrconf_mod_timer(ifp, AC_RS,
2785 (ifp->probes == idev->cnf.rtr_solicits) ?
2786 idev->cnf.rtr_solicit_delay :
2787 idev->cnf.rtr_solicit_interval);
2788 spin_unlock(&ifp->lock);
2789
2790 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2791 } else {
2792 spin_unlock(&ifp->lock);
2793 /*
2794 * Note: we do not support deprecated "all on-link"
2795 * assumption any longer.
2796 */
2797 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2798 idev->dev->name);
2799 }
2800
2801 out:
2802 read_unlock(&idev->lock);
2803 in6_ifa_put(ifp);
2804 }
2805
2806 /*
2807 * Duplicate Address Detection
2808 */
2809 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2810 {
2811 unsigned long rand_num;
2812 struct inet6_dev *idev = ifp->idev;
2813
2814 if (ifp->flags & IFA_F_OPTIMISTIC)
2815 rand_num = 0;
2816 else
2817 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2818
2819 ifp->probes = idev->cnf.dad_transmits;
2820 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2821 }
2822
2823 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2824 {
2825 struct inet6_dev *idev = ifp->idev;
2826 struct net_device *dev = idev->dev;
2827
2828 addrconf_join_solict(dev, &ifp->addr);
2829
2830 net_srandom(ifp->addr.s6_addr32[3]);
2831
2832 read_lock_bh(&idev->lock);
2833 spin_lock(&ifp->lock);
2834 if (ifp->state == INET6_IFADDR_STATE_DEAD)
2835 goto out;
2836
2837 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2838 idev->cnf.accept_dad < 1 ||
2839 !(ifp->flags&IFA_F_TENTATIVE) ||
2840 ifp->flags & IFA_F_NODAD) {
2841 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
2842 spin_unlock(&ifp->lock);
2843 read_unlock_bh(&idev->lock);
2844
2845 addrconf_dad_completed(ifp);
2846 return;
2847 }
2848
2849 if (!(idev->if_flags & IF_READY)) {
2850 spin_unlock(&ifp->lock);
2851 read_unlock_bh(&idev->lock);
2852 /*
2853 * If the device is not ready:
2854 * - keep it tentative if it is a permanent address.
2855 * - otherwise, kill it.
2856 */
2857 in6_ifa_hold(ifp);
2858 addrconf_dad_stop(ifp, 0);
2859 return;
2860 }
2861
2862 /*
2863 * Optimistic nodes can start receiving
2864 * Frames right away
2865 */
2866 if (ifp->flags & IFA_F_OPTIMISTIC)
2867 ip6_ins_rt(ifp->rt);
2868
2869 addrconf_dad_kick(ifp);
2870 out:
2871 spin_unlock(&ifp->lock);
2872 read_unlock_bh(&idev->lock);
2873 }
2874
2875 static void addrconf_dad_timer(unsigned long data)
2876 {
2877 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2878 struct inet6_dev *idev = ifp->idev;
2879 struct in6_addr mcaddr;
2880
2881 if (!ifp->probes && addrconf_dad_end(ifp))
2882 goto out;
2883
2884 read_lock(&idev->lock);
2885 if (idev->dead || !(idev->if_flags & IF_READY)) {
2886 read_unlock(&idev->lock);
2887 goto out;
2888 }
2889
2890 spin_lock(&ifp->lock);
2891 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
2892 spin_unlock(&ifp->lock);
2893 read_unlock(&idev->lock);
2894 goto out;
2895 }
2896
2897 if (ifp->probes == 0) {
2898 /*
2899 * DAD was successful
2900 */
2901
2902 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
2903 spin_unlock(&ifp->lock);
2904 read_unlock(&idev->lock);
2905
2906 addrconf_dad_completed(ifp);
2907
2908 goto out;
2909 }
2910
2911 ifp->probes--;
2912 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2913 spin_unlock(&ifp->lock);
2914 read_unlock(&idev->lock);
2915
2916 /* send a neighbour solicitation for our addr */
2917 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2918 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
2919 out:
2920 in6_ifa_put(ifp);
2921 }
2922
2923 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2924 {
2925 struct net_device *dev = ifp->idev->dev;
2926
2927 /*
2928 * Configure the address for reception. Now it is valid.
2929 */
2930
2931 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2932
2933 /* If added prefix is link local and forwarding is off,
2934 start sending router solicitations.
2935 */
2936
2937 if ((ifp->idev->cnf.forwarding == 0 ||
2938 ifp->idev->cnf.forwarding == 2) &&
2939 ifp->idev->cnf.rtr_solicits > 0 &&
2940 (dev->flags&IFF_LOOPBACK) == 0 &&
2941 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2942 /*
2943 * If a host as already performed a random delay
2944 * [...] as part of DAD [...] there is no need
2945 * to delay again before sending the first RS
2946 */
2947 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2948
2949 spin_lock_bh(&ifp->lock);
2950 ifp->probes = 1;
2951 ifp->idev->if_flags |= IF_RS_SENT;
2952 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2953 spin_unlock_bh(&ifp->lock);
2954 }
2955 }
2956
2957 static void addrconf_dad_run(struct inet6_dev *idev)
2958 {
2959 struct inet6_ifaddr *ifp;
2960
2961 read_lock_bh(&idev->lock);
2962 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2963 spin_lock(&ifp->lock);
2964 if (ifp->flags & IFA_F_TENTATIVE &&
2965 ifp->state == INET6_IFADDR_STATE_DAD)
2966 addrconf_dad_kick(ifp);
2967 spin_unlock(&ifp->lock);
2968 }
2969 read_unlock_bh(&idev->lock);
2970 }
2971
2972 #ifdef CONFIG_PROC_FS
2973 struct if6_iter_state {
2974 struct seq_net_private p;
2975 int bucket;
2976 };
2977
2978 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2979 {
2980 struct inet6_ifaddr *ifa = NULL;
2981 struct if6_iter_state *state = seq->private;
2982 struct net *net = seq_file_net(seq);
2983
2984 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2985 struct hlist_node *n;
2986 hlist_for_each_entry_rcu_bh(ifa, n, &inet6_addr_lst[state->bucket],
2987 addr_lst)
2988 if (net_eq(dev_net(ifa->idev->dev), net))
2989 return ifa;
2990 }
2991 return NULL;
2992 }
2993
2994 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
2995 struct inet6_ifaddr *ifa)
2996 {
2997 struct if6_iter_state *state = seq->private;
2998 struct net *net = seq_file_net(seq);
2999 struct hlist_node *n = &ifa->addr_lst;
3000
3001 hlist_for_each_entry_continue_rcu_bh(ifa, n, addr_lst)
3002 if (net_eq(dev_net(ifa->idev->dev), net))
3003 return ifa;
3004
3005 while (++state->bucket < IN6_ADDR_HSIZE) {
3006 hlist_for_each_entry_rcu_bh(ifa, n,
3007 &inet6_addr_lst[state->bucket], addr_lst) {
3008 if (net_eq(dev_net(ifa->idev->dev), net))
3009 return ifa;
3010 }
3011 }
3012
3013 return NULL;
3014 }
3015
3016 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
3017 {
3018 struct inet6_ifaddr *ifa = if6_get_first(seq);
3019
3020 if (ifa)
3021 while (pos && (ifa = if6_get_next(seq, ifa)) != NULL)
3022 --pos;
3023 return pos ? NULL : ifa;
3024 }
3025
3026 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3027 __acquires(rcu_bh)
3028 {
3029 rcu_read_lock_bh();
3030 return if6_get_idx(seq, *pos);
3031 }
3032
3033 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3034 {
3035 struct inet6_ifaddr *ifa;
3036
3037 ifa = if6_get_next(seq, v);
3038 ++*pos;
3039 return ifa;
3040 }
3041
3042 static void if6_seq_stop(struct seq_file *seq, void *v)
3043 __releases(rcu_bh)
3044 {
3045 rcu_read_unlock_bh();
3046 }
3047
3048 static int if6_seq_show(struct seq_file *seq, void *v)
3049 {
3050 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3051 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3052 &ifp->addr,
3053 ifp->idev->dev->ifindex,
3054 ifp->prefix_len,
3055 ifp->scope,
3056 ifp->flags,
3057 ifp->idev->dev->name);
3058 return 0;
3059 }
3060
3061 static const struct seq_operations if6_seq_ops = {
3062 .start = if6_seq_start,
3063 .next = if6_seq_next,
3064 .show = if6_seq_show,
3065 .stop = if6_seq_stop,
3066 };
3067
3068 static int if6_seq_open(struct inode *inode, struct file *file)
3069 {
3070 return seq_open_net(inode, file, &if6_seq_ops,
3071 sizeof(struct if6_iter_state));
3072 }
3073
3074 static const struct file_operations if6_fops = {
3075 .owner = THIS_MODULE,
3076 .open = if6_seq_open,
3077 .read = seq_read,
3078 .llseek = seq_lseek,
3079 .release = seq_release_net,
3080 };
3081
3082 static int __net_init if6_proc_net_init(struct net *net)
3083 {
3084 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
3085 return -ENOMEM;
3086 return 0;
3087 }
3088
3089 static void __net_exit if6_proc_net_exit(struct net *net)
3090 {
3091 proc_net_remove(net, "if_inet6");
3092 }
3093
3094 static struct pernet_operations if6_proc_net_ops = {
3095 .init = if6_proc_net_init,
3096 .exit = if6_proc_net_exit,
3097 };
3098
3099 int __init if6_proc_init(void)
3100 {
3101 return register_pernet_subsys(&if6_proc_net_ops);
3102 }
3103
3104 void if6_proc_exit(void)
3105 {
3106 unregister_pernet_subsys(&if6_proc_net_ops);
3107 }
3108 #endif /* CONFIG_PROC_FS */
3109
3110 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3111 /* Check if address is a home address configured on any interface. */
3112 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3113 {
3114 int ret = 0;
3115 struct inet6_ifaddr *ifp = NULL;
3116 struct hlist_node *n;
3117 unsigned int hash = ipv6_addr_hash(addr);
3118
3119 rcu_read_lock_bh();
3120 hlist_for_each_entry_rcu_bh(ifp, n, &inet6_addr_lst[hash], addr_lst) {
3121 if (!net_eq(dev_net(ifp->idev->dev), net))
3122 continue;
3123 if (ipv6_addr_equal(&ifp->addr, addr) &&
3124 (ifp->flags & IFA_F_HOMEADDRESS)) {
3125 ret = 1;
3126 break;
3127 }
3128 }
3129 rcu_read_unlock_bh();
3130 return ret;
3131 }
3132 #endif
3133
3134 /*
3135 * Periodic address status verification
3136 */
3137
3138 static void addrconf_verify(unsigned long foo)
3139 {
3140 unsigned long now, next, next_sec, next_sched;
3141 struct inet6_ifaddr *ifp;
3142 struct hlist_node *node;
3143 int i;
3144
3145 rcu_read_lock_bh();
3146 spin_lock(&addrconf_verify_lock);
3147 now = jiffies;
3148 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3149
3150 del_timer(&addr_chk_timer);
3151
3152 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3153 restart:
3154 hlist_for_each_entry_rcu_bh(ifp, node,
3155 &inet6_addr_lst[i], addr_lst) {
3156 unsigned long age;
3157
3158 if (ifp->flags & IFA_F_PERMANENT)
3159 continue;
3160
3161 spin_lock(&ifp->lock);
3162 /* We try to batch several events at once. */
3163 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3164
3165 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3166 age >= ifp->valid_lft) {
3167 spin_unlock(&ifp->lock);
3168 in6_ifa_hold(ifp);
3169 ipv6_del_addr(ifp);
3170 goto restart;
3171 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3172 spin_unlock(&ifp->lock);
3173 continue;
3174 } else if (age >= ifp->prefered_lft) {
3175 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3176 int deprecate = 0;
3177
3178 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3179 deprecate = 1;
3180 ifp->flags |= IFA_F_DEPRECATED;
3181 }
3182
3183 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3184 next = ifp->tstamp + ifp->valid_lft * HZ;
3185
3186 spin_unlock(&ifp->lock);
3187
3188 if (deprecate) {
3189 in6_ifa_hold(ifp);
3190
3191 ipv6_ifa_notify(0, ifp);
3192 in6_ifa_put(ifp);
3193 goto restart;
3194 }
3195 #ifdef CONFIG_IPV6_PRIVACY
3196 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3197 !(ifp->flags&IFA_F_TENTATIVE)) {
3198 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3199 ifp->idev->cnf.dad_transmits *
3200 ifp->idev->nd_parms->retrans_time / HZ;
3201
3202 if (age >= ifp->prefered_lft - regen_advance) {
3203 struct inet6_ifaddr *ifpub = ifp->ifpub;
3204 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3205 next = ifp->tstamp + ifp->prefered_lft * HZ;
3206 if (!ifp->regen_count && ifpub) {
3207 ifp->regen_count++;
3208 in6_ifa_hold(ifp);
3209 in6_ifa_hold(ifpub);
3210 spin_unlock(&ifp->lock);
3211
3212 spin_lock(&ifpub->lock);
3213 ifpub->regen_count = 0;
3214 spin_unlock(&ifpub->lock);
3215 ipv6_create_tempaddr(ifpub, ifp);
3216 in6_ifa_put(ifpub);
3217 in6_ifa_put(ifp);
3218 goto restart;
3219 }
3220 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3221 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3222 spin_unlock(&ifp->lock);
3223 #endif
3224 } else {
3225 /* ifp->prefered_lft <= ifp->valid_lft */
3226 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3227 next = ifp->tstamp + ifp->prefered_lft * HZ;
3228 spin_unlock(&ifp->lock);
3229 }
3230 }
3231 }
3232
3233 next_sec = round_jiffies_up(next);
3234 next_sched = next;
3235
3236 /* If rounded timeout is accurate enough, accept it. */
3237 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3238 next_sched = next_sec;
3239
3240 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3241 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3242 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3243
3244 ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3245 now, next, next_sec, next_sched));
3246
3247 addr_chk_timer.expires = next_sched;
3248 add_timer(&addr_chk_timer);
3249 spin_unlock(&addrconf_verify_lock);
3250 rcu_read_unlock_bh();
3251 }
3252
3253 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3254 {
3255 struct in6_addr *pfx = NULL;
3256
3257 if (addr)
3258 pfx = nla_data(addr);
3259
3260 if (local) {
3261 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3262 pfx = NULL;
3263 else
3264 pfx = nla_data(local);
3265 }
3266
3267 return pfx;
3268 }
3269
3270 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3271 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3272 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3273 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3274 };
3275
3276 static int
3277 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3278 {
3279 struct net *net = sock_net(skb->sk);
3280 struct ifaddrmsg *ifm;
3281 struct nlattr *tb[IFA_MAX+1];
3282 struct in6_addr *pfx;
3283 int err;
3284
3285 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3286 if (err < 0)
3287 return err;
3288
3289 ifm = nlmsg_data(nlh);
3290 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3291 if (pfx == NULL)
3292 return -EINVAL;
3293
3294 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3295 }
3296
3297 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3298 u32 prefered_lft, u32 valid_lft)
3299 {
3300 u32 flags;
3301 clock_t expires;
3302 unsigned long timeout;
3303
3304 if (!valid_lft || (prefered_lft > valid_lft))
3305 return -EINVAL;
3306
3307 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3308 if (addrconf_finite_timeout(timeout)) {
3309 expires = jiffies_to_clock_t(timeout * HZ);
3310 valid_lft = timeout;
3311 flags = RTF_EXPIRES;
3312 } else {
3313 expires = 0;
3314 flags = 0;
3315 ifa_flags |= IFA_F_PERMANENT;
3316 }
3317
3318 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3319 if (addrconf_finite_timeout(timeout)) {
3320 if (timeout == 0)
3321 ifa_flags |= IFA_F_DEPRECATED;
3322 prefered_lft = timeout;
3323 }
3324
3325 spin_lock_bh(&ifp->lock);
3326 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3327 ifp->tstamp = jiffies;
3328 ifp->valid_lft = valid_lft;
3329 ifp->prefered_lft = prefered_lft;
3330
3331 spin_unlock_bh(&ifp->lock);
3332 if (!(ifp->flags&IFA_F_TENTATIVE))
3333 ipv6_ifa_notify(0, ifp);
3334
3335 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3336 expires, flags);
3337 addrconf_verify(0);
3338
3339 return 0;
3340 }
3341
3342 static int
3343 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3344 {
3345 struct net *net = sock_net(skb->sk);
3346 struct ifaddrmsg *ifm;
3347 struct nlattr *tb[IFA_MAX+1];
3348 struct in6_addr *pfx;
3349 struct inet6_ifaddr *ifa;
3350 struct net_device *dev;
3351 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3352 u8 ifa_flags;
3353 int err;
3354
3355 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3356 if (err < 0)
3357 return err;
3358
3359 ifm = nlmsg_data(nlh);
3360 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3361 if (pfx == NULL)
3362 return -EINVAL;
3363
3364 if (tb[IFA_CACHEINFO]) {
3365 struct ifa_cacheinfo *ci;
3366
3367 ci = nla_data(tb[IFA_CACHEINFO]);
3368 valid_lft = ci->ifa_valid;
3369 preferred_lft = ci->ifa_prefered;
3370 } else {
3371 preferred_lft = INFINITY_LIFE_TIME;
3372 valid_lft = INFINITY_LIFE_TIME;
3373 }
3374
3375 dev = __dev_get_by_index(net, ifm->ifa_index);
3376 if (dev == NULL)
3377 return -ENODEV;
3378
3379 /* We ignore other flags so far. */
3380 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3381
3382 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3383 if (ifa == NULL) {
3384 /*
3385 * It would be best to check for !NLM_F_CREATE here but
3386 * userspace alreay relies on not having to provide this.
3387 */
3388 return inet6_addr_add(net, ifm->ifa_index, pfx,
3389 ifm->ifa_prefixlen, ifa_flags,
3390 preferred_lft, valid_lft);
3391 }
3392
3393 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3394 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3395 err = -EEXIST;
3396 else
3397 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3398
3399 in6_ifa_put(ifa);
3400
3401 return err;
3402 }
3403
3404 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3405 u8 scope, int ifindex)
3406 {
3407 struct ifaddrmsg *ifm;
3408
3409 ifm = nlmsg_data(nlh);
3410 ifm->ifa_family = AF_INET6;
3411 ifm->ifa_prefixlen = prefixlen;
3412 ifm->ifa_flags = flags;
3413 ifm->ifa_scope = scope;
3414 ifm->ifa_index = ifindex;
3415 }
3416
3417 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3418 unsigned long tstamp, u32 preferred, u32 valid)
3419 {
3420 struct ifa_cacheinfo ci;
3421
3422 ci.cstamp = cstamp_delta(cstamp);
3423 ci.tstamp = cstamp_delta(tstamp);
3424 ci.ifa_prefered = preferred;
3425 ci.ifa_valid = valid;
3426
3427 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3428 }
3429
3430 static inline int rt_scope(int ifa_scope)
3431 {
3432 if (ifa_scope & IFA_HOST)
3433 return RT_SCOPE_HOST;
3434 else if (ifa_scope & IFA_LINK)
3435 return RT_SCOPE_LINK;
3436 else if (ifa_scope & IFA_SITE)
3437 return RT_SCOPE_SITE;
3438 else
3439 return RT_SCOPE_UNIVERSE;
3440 }
3441
3442 static inline int inet6_ifaddr_msgsize(void)
3443 {
3444 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3445 + nla_total_size(16) /* IFA_ADDRESS */
3446 + nla_total_size(sizeof(struct ifa_cacheinfo));
3447 }
3448
3449 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3450 u32 pid, u32 seq, int event, unsigned int flags)
3451 {
3452 struct nlmsghdr *nlh;
3453 u32 preferred, valid;
3454
3455 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3456 if (nlh == NULL)
3457 return -EMSGSIZE;
3458
3459 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3460 ifa->idev->dev->ifindex);
3461
3462 if (!(ifa->flags&IFA_F_PERMANENT)) {
3463 preferred = ifa->prefered_lft;
3464 valid = ifa->valid_lft;
3465 if (preferred != INFINITY_LIFE_TIME) {
3466 long tval = (jiffies - ifa->tstamp)/HZ;
3467 if (preferred > tval)
3468 preferred -= tval;
3469 else
3470 preferred = 0;
3471 if (valid != INFINITY_LIFE_TIME) {
3472 if (valid > tval)
3473 valid -= tval;
3474 else
3475 valid = 0;
3476 }
3477 }
3478 } else {
3479 preferred = INFINITY_LIFE_TIME;
3480 valid = INFINITY_LIFE_TIME;
3481 }
3482
3483 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3484 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3485 nlmsg_cancel(skb, nlh);
3486 return -EMSGSIZE;
3487 }
3488
3489 return nlmsg_end(skb, nlh);
3490 }
3491
3492 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3493 u32 pid, u32 seq, int event, u16 flags)
3494 {
3495 struct nlmsghdr *nlh;
3496 u8 scope = RT_SCOPE_UNIVERSE;
3497 int ifindex = ifmca->idev->dev->ifindex;
3498
3499 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3500 scope = RT_SCOPE_SITE;
3501
3502 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3503 if (nlh == NULL)
3504 return -EMSGSIZE;
3505
3506 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3507 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3508 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3509 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3510 nlmsg_cancel(skb, nlh);
3511 return -EMSGSIZE;
3512 }
3513
3514 return nlmsg_end(skb, nlh);
3515 }
3516
3517 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3518 u32 pid, u32 seq, int event, unsigned int flags)
3519 {
3520 struct nlmsghdr *nlh;
3521 u8 scope = RT_SCOPE_UNIVERSE;
3522 int ifindex = ifaca->aca_idev->dev->ifindex;
3523
3524 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3525 scope = RT_SCOPE_SITE;
3526
3527 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3528 if (nlh == NULL)
3529 return -EMSGSIZE;
3530
3531 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3532 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3533 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3534 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3535 nlmsg_cancel(skb, nlh);
3536 return -EMSGSIZE;
3537 }
3538
3539 return nlmsg_end(skb, nlh);
3540 }
3541
3542 enum addr_type_t {
3543 UNICAST_ADDR,
3544 MULTICAST_ADDR,
3545 ANYCAST_ADDR,
3546 };
3547
3548 /* called with rcu_read_lock() */
3549 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3550 struct netlink_callback *cb, enum addr_type_t type,
3551 int s_ip_idx, int *p_ip_idx)
3552 {
3553 struct ifmcaddr6 *ifmca;
3554 struct ifacaddr6 *ifaca;
3555 int err = 1;
3556 int ip_idx = *p_ip_idx;
3557
3558 read_lock_bh(&idev->lock);
3559 switch (type) {
3560 case UNICAST_ADDR: {
3561 struct inet6_ifaddr *ifa;
3562
3563 /* unicast address incl. temp addr */
3564 list_for_each_entry(ifa, &idev->addr_list, if_list) {
3565 if (++ip_idx < s_ip_idx)
3566 continue;
3567 err = inet6_fill_ifaddr(skb, ifa,
3568 NETLINK_CB(cb->skb).pid,
3569 cb->nlh->nlmsg_seq,
3570 RTM_NEWADDR,
3571 NLM_F_MULTI);
3572 if (err <= 0)
3573 break;
3574 }
3575 break;
3576 }
3577 case MULTICAST_ADDR:
3578 /* multicast address */
3579 for (ifmca = idev->mc_list; ifmca;
3580 ifmca = ifmca->next, ip_idx++) {
3581 if (ip_idx < s_ip_idx)
3582 continue;
3583 err = inet6_fill_ifmcaddr(skb, ifmca,
3584 NETLINK_CB(cb->skb).pid,
3585 cb->nlh->nlmsg_seq,
3586 RTM_GETMULTICAST,
3587 NLM_F_MULTI);
3588 if (err <= 0)
3589 break;
3590 }
3591 break;
3592 case ANYCAST_ADDR:
3593 /* anycast address */
3594 for (ifaca = idev->ac_list; ifaca;
3595 ifaca = ifaca->aca_next, ip_idx++) {
3596 if (ip_idx < s_ip_idx)
3597 continue;
3598 err = inet6_fill_ifacaddr(skb, ifaca,
3599 NETLINK_CB(cb->skb).pid,
3600 cb->nlh->nlmsg_seq,
3601 RTM_GETANYCAST,
3602 NLM_F_MULTI);
3603 if (err <= 0)
3604 break;
3605 }
3606 break;
3607 default:
3608 break;
3609 }
3610 read_unlock_bh(&idev->lock);
3611 *p_ip_idx = ip_idx;
3612 return err;
3613 }
3614
3615 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3616 enum addr_type_t type)
3617 {
3618 struct net *net = sock_net(skb->sk);
3619 int h, s_h;
3620 int idx, ip_idx;
3621 int s_idx, s_ip_idx;
3622 struct net_device *dev;
3623 struct inet6_dev *idev;
3624 struct hlist_head *head;
3625 struct hlist_node *node;
3626
3627 s_h = cb->args[0];
3628 s_idx = idx = cb->args[1];
3629 s_ip_idx = ip_idx = cb->args[2];
3630
3631 rcu_read_lock();
3632 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3633 idx = 0;
3634 head = &net->dev_index_head[h];
3635 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3636 if (idx < s_idx)
3637 goto cont;
3638 if (h > s_h || idx > s_idx)
3639 s_ip_idx = 0;
3640 ip_idx = 0;
3641 idev = __in6_dev_get(dev);
3642 if (!idev)
3643 goto cont;
3644
3645 if (in6_dump_addrs(idev, skb, cb, type,
3646 s_ip_idx, &ip_idx) <= 0)
3647 goto done;
3648 cont:
3649 idx++;
3650 }
3651 }
3652 done:
3653 rcu_read_unlock();
3654 cb->args[0] = h;
3655 cb->args[1] = idx;
3656 cb->args[2] = ip_idx;
3657
3658 return skb->len;
3659 }
3660
3661 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3662 {
3663 enum addr_type_t type = UNICAST_ADDR;
3664
3665 return inet6_dump_addr(skb, cb, type);
3666 }
3667
3668 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3669 {
3670 enum addr_type_t type = MULTICAST_ADDR;
3671
3672 return inet6_dump_addr(skb, cb, type);
3673 }
3674
3675
3676 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3677 {
3678 enum addr_type_t type = ANYCAST_ADDR;
3679
3680 return inet6_dump_addr(skb, cb, type);
3681 }
3682
3683 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3684 void *arg)
3685 {
3686 struct net *net = sock_net(in_skb->sk);
3687 struct ifaddrmsg *ifm;
3688 struct nlattr *tb[IFA_MAX+1];
3689 struct in6_addr *addr = NULL;
3690 struct net_device *dev = NULL;
3691 struct inet6_ifaddr *ifa;
3692 struct sk_buff *skb;
3693 int err;
3694
3695 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3696 if (err < 0)
3697 goto errout;
3698
3699 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3700 if (addr == NULL) {
3701 err = -EINVAL;
3702 goto errout;
3703 }
3704
3705 ifm = nlmsg_data(nlh);
3706 if (ifm->ifa_index)
3707 dev = __dev_get_by_index(net, ifm->ifa_index);
3708
3709 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
3710 if (!ifa) {
3711 err = -EADDRNOTAVAIL;
3712 goto errout;
3713 }
3714
3715 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
3716 if (!skb) {
3717 err = -ENOBUFS;
3718 goto errout_ifa;
3719 }
3720
3721 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3722 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3723 if (err < 0) {
3724 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3725 WARN_ON(err == -EMSGSIZE);
3726 kfree_skb(skb);
3727 goto errout_ifa;
3728 }
3729 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
3730 errout_ifa:
3731 in6_ifa_put(ifa);
3732 errout:
3733 return err;
3734 }
3735
3736 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3737 {
3738 struct sk_buff *skb;
3739 struct net *net = dev_net(ifa->idev->dev);
3740 int err = -ENOBUFS;
3741
3742 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3743 if (skb == NULL)
3744 goto errout;
3745
3746 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3747 if (err < 0) {
3748 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3749 WARN_ON(err == -EMSGSIZE);
3750 kfree_skb(skb);
3751 goto errout;
3752 }
3753 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3754 return;
3755 errout:
3756 if (err < 0)
3757 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3758 }
3759
3760 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3761 __s32 *array, int bytes)
3762 {
3763 BUG_ON(bytes < (DEVCONF_MAX * 4));
3764
3765 memset(array, 0, bytes);
3766 array[DEVCONF_FORWARDING] = cnf->forwarding;
3767 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3768 array[DEVCONF_MTU6] = cnf->mtu6;
3769 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3770 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3771 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3772 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3773 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3774 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
3775 jiffies_to_msecs(cnf->rtr_solicit_interval);
3776 array[DEVCONF_RTR_SOLICIT_DELAY] =
3777 jiffies_to_msecs(cnf->rtr_solicit_delay);
3778 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3779 #ifdef CONFIG_IPV6_PRIVACY
3780 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3781 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3782 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3783 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3784 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3785 #endif
3786 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3787 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3788 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3789 #ifdef CONFIG_IPV6_ROUTER_PREF
3790 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3791 array[DEVCONF_RTR_PROBE_INTERVAL] =
3792 jiffies_to_msecs(cnf->rtr_probe_interval);
3793 #ifdef CONFIG_IPV6_ROUTE_INFO
3794 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3795 #endif
3796 #endif
3797 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3798 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3799 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3800 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3801 #endif
3802 #ifdef CONFIG_IPV6_MROUTE
3803 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
3804 #endif
3805 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
3806 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
3807 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
3808 }
3809
3810 static inline size_t inet6_ifla6_size(void)
3811 {
3812 return nla_total_size(4) /* IFLA_INET6_FLAGS */
3813 + nla_total_size(sizeof(struct ifla_cacheinfo))
3814 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3815 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3816 + nla_total_size(ICMP6_MIB_MAX * 8); /* IFLA_INET6_ICMP6STATS */
3817 }
3818
3819 static inline size_t inet6_if_nlmsg_size(void)
3820 {
3821 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3822 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3823 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3824 + nla_total_size(4) /* IFLA_MTU */
3825 + nla_total_size(4) /* IFLA_LINK */
3826 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
3827 }
3828
3829 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
3830 int items, int bytes)
3831 {
3832 int i;
3833 int pad = bytes - sizeof(u64) * items;
3834 BUG_ON(pad < 0);
3835
3836 /* Use put_unaligned() because stats may not be aligned for u64. */
3837 put_unaligned(items, &stats[0]);
3838 for (i = 1; i < items; i++)
3839 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
3840
3841 memset(&stats[items], 0, pad);
3842 }
3843
3844 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib,
3845 int items, int bytes, size_t syncpoff)
3846 {
3847 int i;
3848 int pad = bytes - sizeof(u64) * items;
3849 BUG_ON(pad < 0);
3850
3851 /* Use put_unaligned() because stats may not be aligned for u64. */
3852 put_unaligned(items, &stats[0]);
3853 for (i = 1; i < items; i++)
3854 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
3855
3856 memset(&stats[items], 0, pad);
3857 }
3858
3859 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3860 int bytes)
3861 {
3862 switch (attrtype) {
3863 case IFLA_INET6_STATS:
3864 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6,
3865 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
3866 break;
3867 case IFLA_INET6_ICMP6STATS:
3868 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
3869 break;
3870 }
3871 }
3872
3873 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
3874 {
3875 struct nlattr *nla;
3876 struct ifla_cacheinfo ci;
3877
3878 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
3879
3880 ci.max_reasm_len = IPV6_MAXPLEN;
3881 ci.tstamp = cstamp_delta(idev->tstamp);
3882 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
3883 ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time);
3884 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3885
3886 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3887 if (nla == NULL)
3888 goto nla_put_failure;
3889 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
3890
3891 /* XXX - MC not implemented */
3892
3893 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3894 if (nla == NULL)
3895 goto nla_put_failure;
3896 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3897
3898 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3899 if (nla == NULL)
3900 goto nla_put_failure;
3901 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
3902
3903 return 0;
3904
3905 nla_put_failure:
3906 return -EMSGSIZE;
3907 }
3908
3909 static size_t inet6_get_link_af_size(const struct net_device *dev)
3910 {
3911 if (!__in6_dev_get(dev))
3912 return 0;
3913
3914 return inet6_ifla6_size();
3915 }
3916
3917 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
3918 {
3919 struct inet6_dev *idev = __in6_dev_get(dev);
3920
3921 if (!idev)
3922 return -ENODATA;
3923
3924 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
3925 return -EMSGSIZE;
3926
3927 return 0;
3928 }
3929
3930 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3931 u32 pid, u32 seq, int event, unsigned int flags)
3932 {
3933 struct net_device *dev = idev->dev;
3934 struct ifinfomsg *hdr;
3935 struct nlmsghdr *nlh;
3936 void *protoinfo;
3937
3938 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3939 if (nlh == NULL)
3940 return -EMSGSIZE;
3941
3942 hdr = nlmsg_data(nlh);
3943 hdr->ifi_family = AF_INET6;
3944 hdr->__ifi_pad = 0;
3945 hdr->ifi_type = dev->type;
3946 hdr->ifi_index = dev->ifindex;
3947 hdr->ifi_flags = dev_get_flags(dev);
3948 hdr->ifi_change = 0;
3949
3950 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
3951
3952 if (dev->addr_len)
3953 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3954
3955 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
3956 if (dev->ifindex != dev->iflink)
3957 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
3958
3959 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3960 if (protoinfo == NULL)
3961 goto nla_put_failure;
3962
3963 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
3964 goto nla_put_failure;
3965
3966 nla_nest_end(skb, protoinfo);
3967 return nlmsg_end(skb, nlh);
3968
3969 nla_put_failure:
3970 nlmsg_cancel(skb, nlh);
3971 return -EMSGSIZE;
3972 }
3973
3974 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3975 {
3976 struct net *net = sock_net(skb->sk);
3977 int h, s_h;
3978 int idx = 0, s_idx;
3979 struct net_device *dev;
3980 struct inet6_dev *idev;
3981 struct hlist_head *head;
3982 struct hlist_node *node;
3983
3984 s_h = cb->args[0];
3985 s_idx = cb->args[1];
3986
3987 rcu_read_lock();
3988 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3989 idx = 0;
3990 head = &net->dev_index_head[h];
3991 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3992 if (idx < s_idx)
3993 goto cont;
3994 idev = __in6_dev_get(dev);
3995 if (!idev)
3996 goto cont;
3997 if (inet6_fill_ifinfo(skb, idev,
3998 NETLINK_CB(cb->skb).pid,
3999 cb->nlh->nlmsg_seq,
4000 RTM_NEWLINK, NLM_F_MULTI) <= 0)
4001 goto out;
4002 cont:
4003 idx++;
4004 }
4005 }
4006 out:
4007 rcu_read_unlock();
4008 cb->args[1] = idx;
4009 cb->args[0] = h;
4010
4011 return skb->len;
4012 }
4013
4014 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4015 {
4016 struct sk_buff *skb;
4017 struct net *net = dev_net(idev->dev);
4018 int err = -ENOBUFS;
4019
4020 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
4021 if (skb == NULL)
4022 goto errout;
4023
4024 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
4025 if (err < 0) {
4026 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4027 WARN_ON(err == -EMSGSIZE);
4028 kfree_skb(skb);
4029 goto errout;
4030 }
4031 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
4032 return;
4033 errout:
4034 if (err < 0)
4035 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
4036 }
4037
4038 static inline size_t inet6_prefix_nlmsg_size(void)
4039 {
4040 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4041 + nla_total_size(sizeof(struct in6_addr))
4042 + nla_total_size(sizeof(struct prefix_cacheinfo));
4043 }
4044
4045 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
4046 struct prefix_info *pinfo, u32 pid, u32 seq,
4047 int event, unsigned int flags)
4048 {
4049 struct prefixmsg *pmsg;
4050 struct nlmsghdr *nlh;
4051 struct prefix_cacheinfo ci;
4052
4053 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
4054 if (nlh == NULL)
4055 return -EMSGSIZE;
4056
4057 pmsg = nlmsg_data(nlh);
4058 pmsg->prefix_family = AF_INET6;
4059 pmsg->prefix_pad1 = 0;
4060 pmsg->prefix_pad2 = 0;
4061 pmsg->prefix_ifindex = idev->dev->ifindex;
4062 pmsg->prefix_len = pinfo->prefix_len;
4063 pmsg->prefix_type = pinfo->type;
4064 pmsg->prefix_pad3 = 0;
4065 pmsg->prefix_flags = 0;
4066 if (pinfo->onlink)
4067 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4068 if (pinfo->autoconf)
4069 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4070
4071 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
4072
4073 ci.preferred_time = ntohl(pinfo->prefered);
4074 ci.valid_time = ntohl(pinfo->valid);
4075 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
4076
4077 return nlmsg_end(skb, nlh);
4078
4079 nla_put_failure:
4080 nlmsg_cancel(skb, nlh);
4081 return -EMSGSIZE;
4082 }
4083
4084 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
4085 struct prefix_info *pinfo)
4086 {
4087 struct sk_buff *skb;
4088 struct net *net = dev_net(idev->dev);
4089 int err = -ENOBUFS;
4090
4091 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
4092 if (skb == NULL)
4093 goto errout;
4094
4095 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
4096 if (err < 0) {
4097 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4098 WARN_ON(err == -EMSGSIZE);
4099 kfree_skb(skb);
4100 goto errout;
4101 }
4102 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4103 return;
4104 errout:
4105 if (err < 0)
4106 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
4107 }
4108
4109 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4110 {
4111 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4112
4113 switch (event) {
4114 case RTM_NEWADDR:
4115 /*
4116 * If the address was optimistic
4117 * we inserted the route at the start of
4118 * our DAD process, so we don't need
4119 * to do it again
4120 */
4121 if (!(ifp->rt->rt6i_node))
4122 ip6_ins_rt(ifp->rt);
4123 if (ifp->idev->cnf.forwarding)
4124 addrconf_join_anycast(ifp);
4125 break;
4126 case RTM_DELADDR:
4127 if (ifp->idev->cnf.forwarding)
4128 addrconf_leave_anycast(ifp);
4129 addrconf_leave_solict(ifp->idev, &ifp->addr);
4130 dst_hold(&ifp->rt->dst);
4131
4132 if (ip6_del_rt(ifp->rt))
4133 dst_free(&ifp->rt->dst);
4134 break;
4135 }
4136 }
4137
4138 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4139 {
4140 rcu_read_lock_bh();
4141 if (likely(ifp->idev->dead == 0))
4142 __ipv6_ifa_notify(event, ifp);
4143 rcu_read_unlock_bh();
4144 }
4145
4146 #ifdef CONFIG_SYSCTL
4147
4148 static
4149 int addrconf_sysctl_forward(ctl_table *ctl, int write,
4150 void __user *buffer, size_t *lenp, loff_t *ppos)
4151 {
4152 int *valp = ctl->data;
4153 int val = *valp;
4154 loff_t pos = *ppos;
4155 int ret;
4156
4157 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
4158
4159 if (write)
4160 ret = addrconf_fixup_forwarding(ctl, valp, val);
4161 if (ret)
4162 *ppos = pos;
4163 return ret;
4164 }
4165
4166 static void dev_disable_change(struct inet6_dev *idev)
4167 {
4168 if (!idev || !idev->dev)
4169 return;
4170
4171 if (idev->cnf.disable_ipv6)
4172 addrconf_notify(NULL, NETDEV_DOWN, idev->dev);
4173 else
4174 addrconf_notify(NULL, NETDEV_UP, idev->dev);
4175 }
4176
4177 static void addrconf_disable_change(struct net *net, __s32 newf)
4178 {
4179 struct net_device *dev;
4180 struct inet6_dev *idev;
4181
4182 rcu_read_lock();
4183 for_each_netdev_rcu(net, dev) {
4184 idev = __in6_dev_get(dev);
4185 if (idev) {
4186 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4187 idev->cnf.disable_ipv6 = newf;
4188 if (changed)
4189 dev_disable_change(idev);
4190 }
4191 }
4192 rcu_read_unlock();
4193 }
4194
4195 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int old)
4196 {
4197 struct net *net;
4198
4199 net = (struct net *)table->extra2;
4200
4201 if (p == &net->ipv6.devconf_dflt->disable_ipv6)
4202 return 0;
4203
4204 if (!rtnl_trylock()) {
4205 /* Restore the original values before restarting */
4206 *p = old;
4207 return restart_syscall();
4208 }
4209
4210 if (p == &net->ipv6.devconf_all->disable_ipv6) {
4211 __s32 newf = net->ipv6.devconf_all->disable_ipv6;
4212 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4213 addrconf_disable_change(net, newf);
4214 } else if ((!*p) ^ (!old))
4215 dev_disable_change((struct inet6_dev *)table->extra1);
4216
4217 rtnl_unlock();
4218 return 0;
4219 }
4220
4221 static
4222 int addrconf_sysctl_disable(ctl_table *ctl, int write,
4223 void __user *buffer, size_t *lenp, loff_t *ppos)
4224 {
4225 int *valp = ctl->data;
4226 int val = *valp;
4227 loff_t pos = *ppos;
4228 int ret;
4229
4230 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
4231
4232 if (write)
4233 ret = addrconf_disable_ipv6(ctl, valp, val);
4234 if (ret)
4235 *ppos = pos;
4236 return ret;
4237 }
4238
4239 static struct addrconf_sysctl_table
4240 {
4241 struct ctl_table_header *sysctl_header;
4242 ctl_table addrconf_vars[DEVCONF_MAX+1];
4243 char *dev_name;
4244 } addrconf_sysctl __read_mostly = {
4245 .sysctl_header = NULL,
4246 .addrconf_vars = {
4247 {
4248 .procname = "forwarding",
4249 .data = &ipv6_devconf.forwarding,
4250 .maxlen = sizeof(int),
4251 .mode = 0644,
4252 .proc_handler = addrconf_sysctl_forward,
4253 },
4254 {
4255 .procname = "hop_limit",
4256 .data = &ipv6_devconf.hop_limit,
4257 .maxlen = sizeof(int),
4258 .mode = 0644,
4259 .proc_handler = proc_dointvec,
4260 },
4261 {
4262 .procname = "mtu",
4263 .data = &ipv6_devconf.mtu6,
4264 .maxlen = sizeof(int),
4265 .mode = 0644,
4266 .proc_handler = proc_dointvec,
4267 },
4268 {
4269 .procname = "accept_ra",
4270 .data = &ipv6_devconf.accept_ra,
4271 .maxlen = sizeof(int),
4272 .mode = 0644,
4273 .proc_handler = proc_dointvec,
4274 },
4275 {
4276 .procname = "accept_redirects",
4277 .data = &ipv6_devconf.accept_redirects,
4278 .maxlen = sizeof(int),
4279 .mode = 0644,
4280 .proc_handler = proc_dointvec,
4281 },
4282 {
4283 .procname = "autoconf",
4284 .data = &ipv6_devconf.autoconf,
4285 .maxlen = sizeof(int),
4286 .mode = 0644,
4287 .proc_handler = proc_dointvec,
4288 },
4289 {
4290 .procname = "dad_transmits",
4291 .data = &ipv6_devconf.dad_transmits,
4292 .maxlen = sizeof(int),
4293 .mode = 0644,
4294 .proc_handler = proc_dointvec,
4295 },
4296 {
4297 .procname = "router_solicitations",
4298 .data = &ipv6_devconf.rtr_solicits,
4299 .maxlen = sizeof(int),
4300 .mode = 0644,
4301 .proc_handler = proc_dointvec,
4302 },
4303 {
4304 .procname = "router_solicitation_interval",
4305 .data = &ipv6_devconf.rtr_solicit_interval,
4306 .maxlen = sizeof(int),
4307 .mode = 0644,
4308 .proc_handler = proc_dointvec_jiffies,
4309 },
4310 {
4311 .procname = "router_solicitation_delay",
4312 .data = &ipv6_devconf.rtr_solicit_delay,
4313 .maxlen = sizeof(int),
4314 .mode = 0644,
4315 .proc_handler = proc_dointvec_jiffies,
4316 },
4317 {
4318 .procname = "force_mld_version",
4319 .data = &ipv6_devconf.force_mld_version,
4320 .maxlen = sizeof(int),
4321 .mode = 0644,
4322 .proc_handler = proc_dointvec,
4323 },
4324 #ifdef CONFIG_IPV6_PRIVACY
4325 {
4326 .procname = "use_tempaddr",
4327 .data = &ipv6_devconf.use_tempaddr,
4328 .maxlen = sizeof(int),
4329 .mode = 0644,
4330 .proc_handler = proc_dointvec,
4331 },
4332 {
4333 .procname = "temp_valid_lft",
4334 .data = &ipv6_devconf.temp_valid_lft,
4335 .maxlen = sizeof(int),
4336 .mode = 0644,
4337 .proc_handler = proc_dointvec,
4338 },
4339 {
4340 .procname = "temp_prefered_lft",
4341 .data = &ipv6_devconf.temp_prefered_lft,
4342 .maxlen = sizeof(int),
4343 .mode = 0644,
4344 .proc_handler = proc_dointvec,
4345 },
4346 {
4347 .procname = "regen_max_retry",
4348 .data = &ipv6_devconf.regen_max_retry,
4349 .maxlen = sizeof(int),
4350 .mode = 0644,
4351 .proc_handler = proc_dointvec,
4352 },
4353 {
4354 .procname = "max_desync_factor",
4355 .data = &ipv6_devconf.max_desync_factor,
4356 .maxlen = sizeof(int),
4357 .mode = 0644,
4358 .proc_handler = proc_dointvec,
4359 },
4360 #endif
4361 {
4362 .procname = "max_addresses",
4363 .data = &ipv6_devconf.max_addresses,
4364 .maxlen = sizeof(int),
4365 .mode = 0644,
4366 .proc_handler = proc_dointvec,
4367 },
4368 {
4369 .procname = "accept_ra_defrtr",
4370 .data = &ipv6_devconf.accept_ra_defrtr,
4371 .maxlen = sizeof(int),
4372 .mode = 0644,
4373 .proc_handler = proc_dointvec,
4374 },
4375 {
4376 .procname = "accept_ra_pinfo",
4377 .data = &ipv6_devconf.accept_ra_pinfo,
4378 .maxlen = sizeof(int),
4379 .mode = 0644,
4380 .proc_handler = proc_dointvec,
4381 },
4382 #ifdef CONFIG_IPV6_ROUTER_PREF
4383 {
4384 .procname = "accept_ra_rtr_pref",
4385 .data = &ipv6_devconf.accept_ra_rtr_pref,
4386 .maxlen = sizeof(int),
4387 .mode = 0644,
4388 .proc_handler = proc_dointvec,
4389 },
4390 {
4391 .procname = "router_probe_interval",
4392 .data = &ipv6_devconf.rtr_probe_interval,
4393 .maxlen = sizeof(int),
4394 .mode = 0644,
4395 .proc_handler = proc_dointvec_jiffies,
4396 },
4397 #ifdef CONFIG_IPV6_ROUTE_INFO
4398 {
4399 .procname = "accept_ra_rt_info_max_plen",
4400 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4401 .maxlen = sizeof(int),
4402 .mode = 0644,
4403 .proc_handler = proc_dointvec,
4404 },
4405 #endif
4406 #endif
4407 {
4408 .procname = "proxy_ndp",
4409 .data = &ipv6_devconf.proxy_ndp,
4410 .maxlen = sizeof(int),
4411 .mode = 0644,
4412 .proc_handler = proc_dointvec,
4413 },
4414 {
4415 .procname = "accept_source_route",
4416 .data = &ipv6_devconf.accept_source_route,
4417 .maxlen = sizeof(int),
4418 .mode = 0644,
4419 .proc_handler = proc_dointvec,
4420 },
4421 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4422 {
4423 .procname = "optimistic_dad",
4424 .data = &ipv6_devconf.optimistic_dad,
4425 .maxlen = sizeof(int),
4426 .mode = 0644,
4427 .proc_handler = proc_dointvec,
4428
4429 },
4430 #endif
4431 #ifdef CONFIG_IPV6_MROUTE
4432 {
4433 .procname = "mc_forwarding",
4434 .data = &ipv6_devconf.mc_forwarding,
4435 .maxlen = sizeof(int),
4436 .mode = 0444,
4437 .proc_handler = proc_dointvec,
4438 },
4439 #endif
4440 {
4441 .procname = "disable_ipv6",
4442 .data = &ipv6_devconf.disable_ipv6,
4443 .maxlen = sizeof(int),
4444 .mode = 0644,
4445 .proc_handler = addrconf_sysctl_disable,
4446 },
4447 {
4448 .procname = "accept_dad",
4449 .data = &ipv6_devconf.accept_dad,
4450 .maxlen = sizeof(int),
4451 .mode = 0644,
4452 .proc_handler = proc_dointvec,
4453 },
4454 {
4455 .procname = "force_tllao",
4456 .data = &ipv6_devconf.force_tllao,
4457 .maxlen = sizeof(int),
4458 .mode = 0644,
4459 .proc_handler = proc_dointvec
4460 },
4461 {
4462 /* sentinel */
4463 }
4464 },
4465 };
4466
4467 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4468 struct inet6_dev *idev, struct ipv6_devconf *p)
4469 {
4470 int i;
4471 struct addrconf_sysctl_table *t;
4472
4473 #define ADDRCONF_CTL_PATH_DEV 3
4474
4475 struct ctl_path addrconf_ctl_path[] = {
4476 { .procname = "net", },
4477 { .procname = "ipv6", },
4478 { .procname = "conf", },
4479 { /* to be set */ },
4480 { },
4481 };
4482
4483
4484 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4485 if (t == NULL)
4486 goto out;
4487
4488 for (i = 0; t->addrconf_vars[i].data; i++) {
4489 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
4490 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4491 t->addrconf_vars[i].extra2 = net;
4492 }
4493
4494 /*
4495 * Make a copy of dev_name, because '.procname' is regarded as const
4496 * by sysctl and we wouldn't want anyone to change it under our feet
4497 * (see SIOCSIFNAME).
4498 */
4499 t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4500 if (!t->dev_name)
4501 goto free;
4502
4503 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
4504
4505 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
4506 t->addrconf_vars);
4507 if (t->sysctl_header == NULL)
4508 goto free_procname;
4509
4510 p->sysctl = t;
4511 return 0;
4512
4513 free_procname:
4514 kfree(t->dev_name);
4515 free:
4516 kfree(t);
4517 out:
4518 return -ENOBUFS;
4519 }
4520
4521 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4522 {
4523 struct addrconf_sysctl_table *t;
4524
4525 if (p->sysctl == NULL)
4526 return;
4527
4528 t = p->sysctl;
4529 p->sysctl = NULL;
4530 unregister_net_sysctl_table(t->sysctl_header);
4531 kfree(t->dev_name);
4532 kfree(t);
4533 }
4534
4535 static void addrconf_sysctl_register(struct inet6_dev *idev)
4536 {
4537 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
4538 &ndisc_ifinfo_sysctl_change);
4539 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
4540 idev, &idev->cnf);
4541 }
4542
4543 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
4544 {
4545 __addrconf_sysctl_unregister(&idev->cnf);
4546 neigh_sysctl_unregister(idev->nd_parms);
4547 }
4548
4549
4550 #endif
4551
4552 static int __net_init addrconf_init_net(struct net *net)
4553 {
4554 int err;
4555 struct ipv6_devconf *all, *dflt;
4556
4557 err = -ENOMEM;
4558 all = &ipv6_devconf;
4559 dflt = &ipv6_devconf_dflt;
4560
4561 if (!net_eq(net, &init_net)) {
4562 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4563 if (all == NULL)
4564 goto err_alloc_all;
4565
4566 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4567 if (dflt == NULL)
4568 goto err_alloc_dflt;
4569 } else {
4570 /* these will be inherited by all namespaces */
4571 dflt->autoconf = ipv6_defaults.autoconf;
4572 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
4573 }
4574
4575 net->ipv6.devconf_all = all;
4576 net->ipv6.devconf_dflt = dflt;
4577
4578 #ifdef CONFIG_SYSCTL
4579 err = __addrconf_sysctl_register(net, "all", NULL, all);
4580 if (err < 0)
4581 goto err_reg_all;
4582
4583 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
4584 if (err < 0)
4585 goto err_reg_dflt;
4586 #endif
4587 return 0;
4588
4589 #ifdef CONFIG_SYSCTL
4590 err_reg_dflt:
4591 __addrconf_sysctl_unregister(all);
4592 err_reg_all:
4593 kfree(dflt);
4594 #endif
4595 err_alloc_dflt:
4596 kfree(all);
4597 err_alloc_all:
4598 return err;
4599 }
4600
4601 static void __net_exit addrconf_exit_net(struct net *net)
4602 {
4603 #ifdef CONFIG_SYSCTL
4604 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4605 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4606 #endif
4607 if (!net_eq(net, &init_net)) {
4608 kfree(net->ipv6.devconf_dflt);
4609 kfree(net->ipv6.devconf_all);
4610 }
4611 }
4612
4613 static struct pernet_operations addrconf_ops = {
4614 .init = addrconf_init_net,
4615 .exit = addrconf_exit_net,
4616 };
4617
4618 /*
4619 * Device notifier
4620 */
4621
4622 int register_inet6addr_notifier(struct notifier_block *nb)
4623 {
4624 return atomic_notifier_chain_register(&inet6addr_chain, nb);
4625 }
4626 EXPORT_SYMBOL(register_inet6addr_notifier);
4627
4628 int unregister_inet6addr_notifier(struct notifier_block *nb)
4629 {
4630 return atomic_notifier_chain_unregister(&inet6addr_chain, nb);
4631 }
4632 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4633
4634 static struct rtnl_af_ops inet6_ops = {
4635 .family = AF_INET6,
4636 .fill_link_af = inet6_fill_link_af,
4637 .get_link_af_size = inet6_get_link_af_size,
4638 };
4639
4640 /*
4641 * Init / cleanup code
4642 */
4643
4644 int __init addrconf_init(void)
4645 {
4646 int i, err;
4647
4648 err = ipv6_addr_label_init();
4649 if (err < 0) {
4650 printk(KERN_CRIT "IPv6 Addrconf:"
4651 " cannot initialize default policy table: %d.\n", err);
4652 goto out;
4653 }
4654
4655 err = register_pernet_subsys(&addrconf_ops);
4656 if (err < 0)
4657 goto out_addrlabel;
4658
4659 /* The addrconf netdev notifier requires that loopback_dev
4660 * has it's ipv6 private information allocated and setup
4661 * before it can bring up and give link-local addresses
4662 * to other devices which are up.
4663 *
4664 * Unfortunately, loopback_dev is not necessarily the first
4665 * entry in the global dev_base list of net devices. In fact,
4666 * it is likely to be the very last entry on that list.
4667 * So this causes the notifier registry below to try and
4668 * give link-local addresses to all devices besides loopback_dev
4669 * first, then loopback_dev, which cases all the non-loopback_dev
4670 * devices to fail to get a link-local address.
4671 *
4672 * So, as a temporary fix, allocate the ipv6 structure for
4673 * loopback_dev first by hand.
4674 * Longer term, all of the dependencies ipv6 has upon the loopback
4675 * device and it being up should be removed.
4676 */
4677 rtnl_lock();
4678 if (!ipv6_add_dev(init_net.loopback_dev))
4679 err = -ENOMEM;
4680 rtnl_unlock();
4681 if (err)
4682 goto errlo;
4683
4684 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4685 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
4686
4687 register_netdevice_notifier(&ipv6_dev_notf);
4688
4689 addrconf_verify(0);
4690
4691 err = rtnl_af_register(&inet6_ops);
4692 if (err < 0)
4693 goto errout_af;
4694
4695 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4696 if (err < 0)
4697 goto errout;
4698
4699 /* Only the first call to __rtnl_register can fail */
4700 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4701 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4702 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4703 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4704 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4705
4706 ipv6_addr_label_rtnl_register();
4707
4708 return 0;
4709 errout:
4710 rtnl_af_unregister(&inet6_ops);
4711 errout_af:
4712 unregister_netdevice_notifier(&ipv6_dev_notf);
4713 errlo:
4714 unregister_pernet_subsys(&addrconf_ops);
4715 out_addrlabel:
4716 ipv6_addr_label_cleanup();
4717 out:
4718 return err;
4719 }
4720
4721 void addrconf_cleanup(void)
4722 {
4723 struct net_device *dev;
4724 int i;
4725
4726 unregister_netdevice_notifier(&ipv6_dev_notf);
4727 unregister_pernet_subsys(&addrconf_ops);
4728 ipv6_addr_label_cleanup();
4729
4730 rtnl_lock();
4731
4732 __rtnl_af_unregister(&inet6_ops);
4733
4734 /* clean dev list */
4735 for_each_netdev(&init_net, dev) {
4736 if (__in6_dev_get(dev) == NULL)
4737 continue;
4738 addrconf_ifdown(dev, 1);
4739 }
4740 addrconf_ifdown(init_net.loopback_dev, 2);
4741
4742 /*
4743 * Check hash table.
4744 */
4745 spin_lock_bh(&addrconf_hash_lock);
4746 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4747 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
4748 spin_unlock_bh(&addrconf_hash_lock);
4749
4750 del_timer(&addr_chk_timer);
4751 rtnl_unlock();
4752 }
Linux with added FPC-III support