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Staging: hv: mousevsc: Cleanup and properly implement reportdesc_callback()
[zen-stable.git] / net / ipv6 / addrconf.c
blobf012ebd87b4338181f76d3154165eb1f41cd0ba4
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 (dst_get_neighbour_raw(&rt->dst) == 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 if (ifp->prefix_len == 127) /* RFC 6164 */
1474 return;
1475 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1476 if (ipv6_addr_any(&addr))
1477 return;
1478 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1479 }
1480
1481 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1482 {
1483 struct in6_addr addr;
1484 if (ifp->prefix_len == 127) /* RFC 6164 */
1485 return;
1486 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1487 if (ipv6_addr_any(&addr))
1488 return;
1489 __ipv6_dev_ac_dec(ifp->idev, &addr);
1490 }
1491
1492 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1493 {
1494 if (dev->addr_len != ETH_ALEN)
1495 return -1;
1496 memcpy(eui, dev->dev_addr, 3);
1497 memcpy(eui + 5, dev->dev_addr + 3, 3);
1498
1499 /*
1500 * The zSeries OSA network cards can be shared among various
1501 * OS instances, but the OSA cards have only one MAC address.
1502 * This leads to duplicate address conflicts in conjunction
1503 * with IPv6 if more than one instance uses the same card.
1504 *
1505 * The driver for these cards can deliver a unique 16-bit
1506 * identifier for each instance sharing the same card. It is
1507 * placed instead of 0xFFFE in the interface identifier. The
1508 * "u" bit of the interface identifier is not inverted in this
1509 * case. Hence the resulting interface identifier has local
1510 * scope according to RFC2373.
1511 */
1512 if (dev->dev_id) {
1513 eui[3] = (dev->dev_id >> 8) & 0xFF;
1514 eui[4] = dev->dev_id & 0xFF;
1515 } else {
1516 eui[3] = 0xFF;
1517 eui[4] = 0xFE;
1518 eui[0] ^= 2;
1519 }
1520 return 0;
1521 }
1522
1523 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1524 {
1525 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1526 if (dev->addr_len != ARCNET_ALEN)
1527 return -1;
1528 memset(eui, 0, 7);
1529 eui[7] = *(u8*)dev->dev_addr;
1530 return 0;
1531 }
1532
1533 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1534 {
1535 if (dev->addr_len != INFINIBAND_ALEN)
1536 return -1;
1537 memcpy(eui, dev->dev_addr + 12, 8);
1538 eui[0] |= 2;
1539 return 0;
1540 }
1541
1542 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1543 {
1544 if (addr == 0)
1545 return -1;
1546 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1547 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1548 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1549 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1550 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1551 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1552 eui[1] = 0;
1553 eui[2] = 0x5E;
1554 eui[3] = 0xFE;
1555 memcpy(eui + 4, &addr, 4);
1556 return 0;
1557 }
1558
1559 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1560 {
1561 if (dev->priv_flags & IFF_ISATAP)
1562 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1563 return -1;
1564 }
1565
1566 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
1567 {
1568 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1569 }
1570
1571 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1572 {
1573 switch (dev->type) {
1574 case ARPHRD_ETHER:
1575 case ARPHRD_FDDI:
1576 case ARPHRD_IEEE802_TR:
1577 return addrconf_ifid_eui48(eui, dev);
1578 case ARPHRD_ARCNET:
1579 return addrconf_ifid_arcnet(eui, dev);
1580 case ARPHRD_INFINIBAND:
1581 return addrconf_ifid_infiniband(eui, dev);
1582 case ARPHRD_SIT:
1583 return addrconf_ifid_sit(eui, dev);
1584 case ARPHRD_IPGRE:
1585 return addrconf_ifid_gre(eui, dev);
1586 }
1587 return -1;
1588 }
1589
1590 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1591 {
1592 int err = -1;
1593 struct inet6_ifaddr *ifp;
1594
1595 read_lock_bh(&idev->lock);
1596 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1597 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1598 memcpy(eui, ifp->addr.s6_addr+8, 8);
1599 err = 0;
1600 break;
1601 }
1602 }
1603 read_unlock_bh(&idev->lock);
1604 return err;
1605 }
1606
1607 #ifdef CONFIG_IPV6_PRIVACY
1608 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1609 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1610 {
1611 regen:
1612 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1613 idev->rndid[0] &= ~0x02;
1614
1615 /*
1616 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1617 * check if generated address is not inappropriate
1618 *
1619 * - Reserved subnet anycast (RFC 2526)
1620 * 11111101 11....11 1xxxxxxx
1621 * - ISATAP (RFC4214) 6.1
1622 * 00-00-5E-FE-xx-xx-xx-xx
1623 * - value 0
1624 * - XXX: already assigned to an address on the device
1625 */
1626 if (idev->rndid[0] == 0xfd &&
1627 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1628 (idev->rndid[7]&0x80))
1629 goto regen;
1630 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1631 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1632 goto regen;
1633 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1634 goto regen;
1635 }
1636
1637 return 0;
1638 }
1639
1640 static void ipv6_regen_rndid(unsigned long data)
1641 {
1642 struct inet6_dev *idev = (struct inet6_dev *) data;
1643 unsigned long expires;
1644
1645 rcu_read_lock_bh();
1646 write_lock_bh(&idev->lock);
1647
1648 if (idev->dead)
1649 goto out;
1650
1651 if (__ipv6_regen_rndid(idev) < 0)
1652 goto out;
1653
1654 expires = jiffies +
1655 idev->cnf.temp_prefered_lft * HZ -
1656 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time -
1657 idev->cnf.max_desync_factor * HZ;
1658 if (time_before(expires, jiffies)) {
1659 printk(KERN_WARNING
1660 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1661 idev->dev->name);
1662 goto out;
1663 }
1664
1665 if (!mod_timer(&idev->regen_timer, expires))
1666 in6_dev_hold(idev);
1667
1668 out:
1669 write_unlock_bh(&idev->lock);
1670 rcu_read_unlock_bh();
1671 in6_dev_put(idev);
1672 }
1673
1674 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1675 int ret = 0;
1676
1677 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1678 ret = __ipv6_regen_rndid(idev);
1679 return ret;
1680 }
1681 #endif
1682
1683 /*
1684 * Add prefix route.
1685 */
1686
1687 static void
1688 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1689 unsigned long expires, u32 flags)
1690 {
1691 struct fib6_config cfg = {
1692 .fc_table = RT6_TABLE_PREFIX,
1693 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1694 .fc_ifindex = dev->ifindex,
1695 .fc_expires = expires,
1696 .fc_dst_len = plen,
1697 .fc_flags = RTF_UP | flags,
1698 .fc_nlinfo.nl_net = dev_net(dev),
1699 .fc_protocol = RTPROT_KERNEL,
1700 };
1701
1702 ipv6_addr_copy(&cfg.fc_dst, pfx);
1703
1704 /* Prevent useless cloning on PtP SIT.
1705 This thing is done here expecting that the whole
1706 class of non-broadcast devices need not cloning.
1707 */
1708 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1709 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1710 cfg.fc_flags |= RTF_NONEXTHOP;
1711 #endif
1712
1713 ip6_route_add(&cfg);
1714 }
1715
1716 /* Create "default" multicast route to the interface */
1717
1718 static void addrconf_add_mroute(struct net_device *dev)
1719 {
1720 struct fib6_config cfg = {
1721 .fc_table = RT6_TABLE_LOCAL,
1722 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1723 .fc_ifindex = dev->ifindex,
1724 .fc_dst_len = 8,
1725 .fc_flags = RTF_UP,
1726 .fc_nlinfo.nl_net = dev_net(dev),
1727 };
1728
1729 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1730
1731 ip6_route_add(&cfg);
1732 }
1733
1734 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1735 static void sit_route_add(struct net_device *dev)
1736 {
1737 struct fib6_config cfg = {
1738 .fc_table = RT6_TABLE_MAIN,
1739 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1740 .fc_ifindex = dev->ifindex,
1741 .fc_dst_len = 96,
1742 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1743 .fc_nlinfo.nl_net = dev_net(dev),
1744 };
1745
1746 /* prefix length - 96 bits "::d.d.d.d" */
1747 ip6_route_add(&cfg);
1748 }
1749 #endif
1750
1751 static void addrconf_add_lroute(struct net_device *dev)
1752 {
1753 struct in6_addr addr;
1754
1755 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1756 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1757 }
1758
1759 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1760 {
1761 struct inet6_dev *idev;
1762
1763 ASSERT_RTNL();
1764
1765 idev = ipv6_find_idev(dev);
1766 if (!idev)
1767 return ERR_PTR(-ENOBUFS);
1768
1769 if (idev->cnf.disable_ipv6)
1770 return ERR_PTR(-EACCES);
1771
1772 /* Add default multicast route */
1773 addrconf_add_mroute(dev);
1774
1775 /* Add link local route */
1776 addrconf_add_lroute(dev);
1777 return idev;
1778 }
1779
1780 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1781 {
1782 struct prefix_info *pinfo;
1783 __u32 valid_lft;
1784 __u32 prefered_lft;
1785 int addr_type;
1786 struct inet6_dev *in6_dev;
1787 struct net *net = dev_net(dev);
1788
1789 pinfo = (struct prefix_info *) opt;
1790
1791 if (len < sizeof(struct prefix_info)) {
1792 ADBG(("addrconf: prefix option too short\n"));
1793 return;
1794 }
1795
1796 /*
1797 * Validation checks ([ADDRCONF], page 19)
1798 */
1799
1800 addr_type = ipv6_addr_type(&pinfo->prefix);
1801
1802 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1803 return;
1804
1805 valid_lft = ntohl(pinfo->valid);
1806 prefered_lft = ntohl(pinfo->prefered);
1807
1808 if (prefered_lft > valid_lft) {
1809 if (net_ratelimit())
1810 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1811 return;
1812 }
1813
1814 in6_dev = in6_dev_get(dev);
1815
1816 if (in6_dev == NULL) {
1817 if (net_ratelimit())
1818 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1819 return;
1820 }
1821
1822 /*
1823 * Two things going on here:
1824 * 1) Add routes for on-link prefixes
1825 * 2) Configure prefixes with the auto flag set
1826 */
1827
1828 if (pinfo->onlink) {
1829 struct rt6_info *rt;
1830 unsigned long rt_expires;
1831
1832 /* Avoid arithmetic overflow. Really, we could
1833 * save rt_expires in seconds, likely valid_lft,
1834 * but it would require division in fib gc, that it
1835 * not good.
1836 */
1837 if (HZ > USER_HZ)
1838 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
1839 else
1840 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
1841
1842 if (addrconf_finite_timeout(rt_expires))
1843 rt_expires *= HZ;
1844
1845 rt = rt6_lookup(net, &pinfo->prefix, NULL,
1846 dev->ifindex, 1);
1847
1848 if (rt && addrconf_is_prefix_route(rt)) {
1849 /* Autoconf prefix route */
1850 if (valid_lft == 0) {
1851 ip6_del_rt(rt);
1852 rt = NULL;
1853 } else if (addrconf_finite_timeout(rt_expires)) {
1854 /* not infinity */
1855 rt->rt6i_expires = jiffies + rt_expires;
1856 rt->rt6i_flags |= RTF_EXPIRES;
1857 } else {
1858 rt->rt6i_flags &= ~RTF_EXPIRES;
1859 rt->rt6i_expires = 0;
1860 }
1861 } else if (valid_lft) {
1862 clock_t expires = 0;
1863 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
1864 if (addrconf_finite_timeout(rt_expires)) {
1865 /* not infinity */
1866 flags |= RTF_EXPIRES;
1867 expires = jiffies_to_clock_t(rt_expires);
1868 }
1869 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1870 dev, expires, flags);
1871 }
1872 if (rt)
1873 dst_release(&rt->dst);
1874 }
1875
1876 /* Try to figure out our local address for this prefix */
1877
1878 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1879 struct inet6_ifaddr * ifp;
1880 struct in6_addr addr;
1881 int create = 0, update_lft = 0;
1882
1883 if (pinfo->prefix_len == 64) {
1884 memcpy(&addr, &pinfo->prefix, 8);
1885 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1886 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1887 in6_dev_put(in6_dev);
1888 return;
1889 }
1890 goto ok;
1891 }
1892 if (net_ratelimit())
1893 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1894 pinfo->prefix_len);
1895 in6_dev_put(in6_dev);
1896 return;
1897
1898 ok:
1899
1900 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1901
1902 if (ifp == NULL && valid_lft) {
1903 int max_addresses = in6_dev->cnf.max_addresses;
1904 u32 addr_flags = 0;
1905
1906 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1907 if (in6_dev->cnf.optimistic_dad &&
1908 !net->ipv6.devconf_all->forwarding)
1909 addr_flags = IFA_F_OPTIMISTIC;
1910 #endif
1911
1912 /* Do not allow to create too much of autoconfigured
1913 * addresses; this would be too easy way to crash kernel.
1914 */
1915 if (!max_addresses ||
1916 ipv6_count_addresses(in6_dev) < max_addresses)
1917 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1918 addr_type&IPV6_ADDR_SCOPE_MASK,
1919 addr_flags);
1920
1921 if (!ifp || IS_ERR(ifp)) {
1922 in6_dev_put(in6_dev);
1923 return;
1924 }
1925
1926 update_lft = create = 1;
1927 ifp->cstamp = jiffies;
1928 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1929 }
1930
1931 if (ifp) {
1932 int flags;
1933 unsigned long now;
1934 #ifdef CONFIG_IPV6_PRIVACY
1935 struct inet6_ifaddr *ift;
1936 #endif
1937 u32 stored_lft;
1938
1939 /* update lifetime (RFC2462 5.5.3 e) */
1940 spin_lock(&ifp->lock);
1941 now = jiffies;
1942 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1943 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1944 else
1945 stored_lft = 0;
1946 if (!update_lft && stored_lft) {
1947 if (valid_lft > MIN_VALID_LIFETIME ||
1948 valid_lft > stored_lft)
1949 update_lft = 1;
1950 else if (stored_lft <= MIN_VALID_LIFETIME) {
1951 /* valid_lft <= stored_lft is always true */
1952 /*
1953 * RFC 4862 Section 5.5.3e:
1954 * "Note that the preferred lifetime of
1955 * the corresponding address is always
1956 * reset to the Preferred Lifetime in
1957 * the received Prefix Information
1958 * option, regardless of whether the
1959 * valid lifetime is also reset or
1960 * ignored."
1961 *
1962 * So if the preferred lifetime in
1963 * this advertisement is different
1964 * than what we have stored, but the
1965 * valid lifetime is invalid, just
1966 * reset prefered_lft.
1967 *
1968 * We must set the valid lifetime
1969 * to the stored lifetime since we'll
1970 * be updating the timestamp below,
1971 * else we'll set it back to the
1972 * minimum.
1973 */
1974 if (prefered_lft != ifp->prefered_lft) {
1975 valid_lft = stored_lft;
1976 update_lft = 1;
1977 }
1978 } else {
1979 valid_lft = MIN_VALID_LIFETIME;
1980 if (valid_lft < prefered_lft)
1981 prefered_lft = valid_lft;
1982 update_lft = 1;
1983 }
1984 }
1985
1986 if (update_lft) {
1987 ifp->valid_lft = valid_lft;
1988 ifp->prefered_lft = prefered_lft;
1989 ifp->tstamp = now;
1990 flags = ifp->flags;
1991 ifp->flags &= ~IFA_F_DEPRECATED;
1992 spin_unlock(&ifp->lock);
1993
1994 if (!(flags&IFA_F_TENTATIVE))
1995 ipv6_ifa_notify(0, ifp);
1996 } else
1997 spin_unlock(&ifp->lock);
1998
1999 #ifdef CONFIG_IPV6_PRIVACY
2000 read_lock_bh(&in6_dev->lock);
2001 /* update all temporary addresses in the list */
2002 list_for_each_entry(ift, &in6_dev->tempaddr_list, tmp_list) {
2003 /*
2004 * When adjusting the lifetimes of an existing
2005 * temporary address, only lower the lifetimes.
2006 * Implementations must not increase the
2007 * lifetimes of an existing temporary address
2008 * when processing a Prefix Information Option.
2009 */
2010 if (ifp != ift->ifpub)
2011 continue;
2012
2013 spin_lock(&ift->lock);
2014 flags = ift->flags;
2015 if (ift->valid_lft > valid_lft &&
2016 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
2017 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
2018 if (ift->prefered_lft > prefered_lft &&
2019 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
2020 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
2021 spin_unlock(&ift->lock);
2022 if (!(flags&IFA_F_TENTATIVE))
2023 ipv6_ifa_notify(0, ift);
2024 }
2025
2026 if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) {
2027 /*
2028 * When a new public address is created as described in [ADDRCONF],
2029 * also create a new temporary address. Also create a temporary
2030 * address if it's enabled but no temporary address currently exists.
2031 */
2032 read_unlock_bh(&in6_dev->lock);
2033 ipv6_create_tempaddr(ifp, NULL);
2034 } else {
2035 read_unlock_bh(&in6_dev->lock);
2036 }
2037 #endif
2038 in6_ifa_put(ifp);
2039 addrconf_verify(0);
2040 }
2041 }
2042 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2043 in6_dev_put(in6_dev);
2044 }
2045
2046 /*
2047 * Set destination address.
2048 * Special case for SIT interfaces where we create a new "virtual"
2049 * device.
2050 */
2051 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2052 {
2053 struct in6_ifreq ireq;
2054 struct net_device *dev;
2055 int err = -EINVAL;
2056
2057 rtnl_lock();
2058
2059 err = -EFAULT;
2060 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2061 goto err_exit;
2062
2063 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2064
2065 err = -ENODEV;
2066 if (dev == NULL)
2067 goto err_exit;
2068
2069 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2070 if (dev->type == ARPHRD_SIT) {
2071 const struct net_device_ops *ops = dev->netdev_ops;
2072 struct ifreq ifr;
2073 struct ip_tunnel_parm p;
2074
2075 err = -EADDRNOTAVAIL;
2076 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2077 goto err_exit;
2078
2079 memset(&p, 0, sizeof(p));
2080 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2081 p.iph.saddr = 0;
2082 p.iph.version = 4;
2083 p.iph.ihl = 5;
2084 p.iph.protocol = IPPROTO_IPV6;
2085 p.iph.ttl = 64;
2086 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2087
2088 if (ops->ndo_do_ioctl) {
2089 mm_segment_t oldfs = get_fs();
2090
2091 set_fs(KERNEL_DS);
2092 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2093 set_fs(oldfs);
2094 } else
2095 err = -EOPNOTSUPP;
2096
2097 if (err == 0) {
2098 err = -ENOBUFS;
2099 dev = __dev_get_by_name(net, p.name);
2100 if (!dev)
2101 goto err_exit;
2102 err = dev_open(dev);
2103 }
2104 }
2105 #endif
2106
2107 err_exit:
2108 rtnl_unlock();
2109 return err;
2110 }
2111
2112 /*
2113 * Manual configuration of address on an interface
2114 */
2115 static int inet6_addr_add(struct net *net, int ifindex, const struct in6_addr *pfx,
2116 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
2117 __u32 valid_lft)
2118 {
2119 struct inet6_ifaddr *ifp;
2120 struct inet6_dev *idev;
2121 struct net_device *dev;
2122 int scope;
2123 u32 flags;
2124 clock_t expires;
2125 unsigned long timeout;
2126
2127 ASSERT_RTNL();
2128
2129 if (plen > 128)
2130 return -EINVAL;
2131
2132 /* check the lifetime */
2133 if (!valid_lft || prefered_lft > valid_lft)
2134 return -EINVAL;
2135
2136 dev = __dev_get_by_index(net, ifindex);
2137 if (!dev)
2138 return -ENODEV;
2139
2140 idev = addrconf_add_dev(dev);
2141 if (IS_ERR(idev))
2142 return PTR_ERR(idev);
2143
2144 scope = ipv6_addr_scope(pfx);
2145
2146 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2147 if (addrconf_finite_timeout(timeout)) {
2148 expires = jiffies_to_clock_t(timeout * HZ);
2149 valid_lft = timeout;
2150 flags = RTF_EXPIRES;
2151 } else {
2152 expires = 0;
2153 flags = 0;
2154 ifa_flags |= IFA_F_PERMANENT;
2155 }
2156
2157 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2158 if (addrconf_finite_timeout(timeout)) {
2159 if (timeout == 0)
2160 ifa_flags |= IFA_F_DEPRECATED;
2161 prefered_lft = timeout;
2162 }
2163
2164 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2165
2166 if (!IS_ERR(ifp)) {
2167 spin_lock_bh(&ifp->lock);
2168 ifp->valid_lft = valid_lft;
2169 ifp->prefered_lft = prefered_lft;
2170 ifp->tstamp = jiffies;
2171 spin_unlock_bh(&ifp->lock);
2172
2173 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2174 expires, flags);
2175 /*
2176 * Note that section 3.1 of RFC 4429 indicates
2177 * that the Optimistic flag should not be set for
2178 * manually configured addresses
2179 */
2180 addrconf_dad_start(ifp, 0);
2181 in6_ifa_put(ifp);
2182 addrconf_verify(0);
2183 return 0;
2184 }
2185
2186 return PTR_ERR(ifp);
2187 }
2188
2189 static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx,
2190 unsigned int plen)
2191 {
2192 struct inet6_ifaddr *ifp;
2193 struct inet6_dev *idev;
2194 struct net_device *dev;
2195
2196 if (plen > 128)
2197 return -EINVAL;
2198
2199 dev = __dev_get_by_index(net, ifindex);
2200 if (!dev)
2201 return -ENODEV;
2202
2203 if ((idev = __in6_dev_get(dev)) == NULL)
2204 return -ENXIO;
2205
2206 read_lock_bh(&idev->lock);
2207 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2208 if (ifp->prefix_len == plen &&
2209 ipv6_addr_equal(pfx, &ifp->addr)) {
2210 in6_ifa_hold(ifp);
2211 read_unlock_bh(&idev->lock);
2212
2213 ipv6_del_addr(ifp);
2214
2215 /* If the last address is deleted administratively,
2216 disable IPv6 on this interface.
2217 */
2218 if (list_empty(&idev->addr_list))
2219 addrconf_ifdown(idev->dev, 1);
2220 return 0;
2221 }
2222 }
2223 read_unlock_bh(&idev->lock);
2224 return -EADDRNOTAVAIL;
2225 }
2226
2227
2228 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2229 {
2230 struct in6_ifreq ireq;
2231 int err;
2232
2233 if (!capable(CAP_NET_ADMIN))
2234 return -EPERM;
2235
2236 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2237 return -EFAULT;
2238
2239 rtnl_lock();
2240 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2241 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2242 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2243 rtnl_unlock();
2244 return err;
2245 }
2246
2247 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2248 {
2249 struct in6_ifreq ireq;
2250 int err;
2251
2252 if (!capable(CAP_NET_ADMIN))
2253 return -EPERM;
2254
2255 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2256 return -EFAULT;
2257
2258 rtnl_lock();
2259 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2260 ireq.ifr6_prefixlen);
2261 rtnl_unlock();
2262 return err;
2263 }
2264
2265 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2266 int plen, int scope)
2267 {
2268 struct inet6_ifaddr *ifp;
2269
2270 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT);
2271 if (!IS_ERR(ifp)) {
2272 spin_lock_bh(&ifp->lock);
2273 ifp->flags &= ~IFA_F_TENTATIVE;
2274 spin_unlock_bh(&ifp->lock);
2275 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2276 in6_ifa_put(ifp);
2277 }
2278 }
2279
2280 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2281 static void sit_add_v4_addrs(struct inet6_dev *idev)
2282 {
2283 struct in6_addr addr;
2284 struct net_device *dev;
2285 struct net *net = dev_net(idev->dev);
2286 int scope;
2287
2288 ASSERT_RTNL();
2289
2290 memset(&addr, 0, sizeof(struct in6_addr));
2291 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2292
2293 if (idev->dev->flags&IFF_POINTOPOINT) {
2294 addr.s6_addr32[0] = htonl(0xfe800000);
2295 scope = IFA_LINK;
2296 } else {
2297 scope = IPV6_ADDR_COMPATv4;
2298 }
2299
2300 if (addr.s6_addr32[3]) {
2301 add_addr(idev, &addr, 128, scope);
2302 return;
2303 }
2304
2305 for_each_netdev(net, dev) {
2306 struct in_device * in_dev = __in_dev_get_rtnl(dev);
2307 if (in_dev && (dev->flags & IFF_UP)) {
2308 struct in_ifaddr * ifa;
2309
2310 int flag = scope;
2311
2312 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2313 int plen;
2314
2315 addr.s6_addr32[3] = ifa->ifa_local;
2316
2317 if (ifa->ifa_scope == RT_SCOPE_LINK)
2318 continue;
2319 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2320 if (idev->dev->flags&IFF_POINTOPOINT)
2321 continue;
2322 flag |= IFA_HOST;
2323 }
2324 if (idev->dev->flags&IFF_POINTOPOINT)
2325 plen = 64;
2326 else
2327 plen = 96;
2328
2329 add_addr(idev, &addr, plen, flag);
2330 }
2331 }
2332 }
2333 }
2334 #endif
2335
2336 static void init_loopback(struct net_device *dev)
2337 {
2338 struct inet6_dev *idev;
2339
2340 /* ::1 */
2341
2342 ASSERT_RTNL();
2343
2344 if ((idev = ipv6_find_idev(dev)) == NULL) {
2345 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2346 return;
2347 }
2348
2349 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2350 }
2351
2352 static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr)
2353 {
2354 struct inet6_ifaddr * ifp;
2355 u32 addr_flags = IFA_F_PERMANENT;
2356
2357 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2358 if (idev->cnf.optimistic_dad &&
2359 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2360 addr_flags |= IFA_F_OPTIMISTIC;
2361 #endif
2362
2363
2364 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2365 if (!IS_ERR(ifp)) {
2366 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2367 addrconf_dad_start(ifp, 0);
2368 in6_ifa_put(ifp);
2369 }
2370 }
2371
2372 static void addrconf_dev_config(struct net_device *dev)
2373 {
2374 struct in6_addr addr;
2375 struct inet6_dev * idev;
2376
2377 ASSERT_RTNL();
2378
2379 if ((dev->type != ARPHRD_ETHER) &&
2380 (dev->type != ARPHRD_FDDI) &&
2381 (dev->type != ARPHRD_IEEE802_TR) &&
2382 (dev->type != ARPHRD_ARCNET) &&
2383 (dev->type != ARPHRD_INFINIBAND)) {
2384 /* Alas, we support only Ethernet autoconfiguration. */
2385 return;
2386 }
2387
2388 idev = addrconf_add_dev(dev);
2389 if (IS_ERR(idev))
2390 return;
2391
2392 memset(&addr, 0, sizeof(struct in6_addr));
2393 addr.s6_addr32[0] = htonl(0xFE800000);
2394
2395 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2396 addrconf_add_linklocal(idev, &addr);
2397 }
2398
2399 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2400 static void addrconf_sit_config(struct net_device *dev)
2401 {
2402 struct inet6_dev *idev;
2403
2404 ASSERT_RTNL();
2405
2406 /*
2407 * Configure the tunnel with one of our IPv4
2408 * addresses... we should configure all of
2409 * our v4 addrs in the tunnel
2410 */
2411
2412 if ((idev = ipv6_find_idev(dev)) == NULL) {
2413 printk(KERN_DEBUG "init sit: add_dev failed\n");
2414 return;
2415 }
2416
2417 if (dev->priv_flags & IFF_ISATAP) {
2418 struct in6_addr addr;
2419
2420 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2421 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2422 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2423 addrconf_add_linklocal(idev, &addr);
2424 return;
2425 }
2426
2427 sit_add_v4_addrs(idev);
2428
2429 if (dev->flags&IFF_POINTOPOINT) {
2430 addrconf_add_mroute(dev);
2431 addrconf_add_lroute(dev);
2432 } else
2433 sit_route_add(dev);
2434 }
2435 #endif
2436
2437 #if defined(CONFIG_NET_IPGRE) || defined(CONFIG_NET_IPGRE_MODULE)
2438 static void addrconf_gre_config(struct net_device *dev)
2439 {
2440 struct inet6_dev *idev;
2441 struct in6_addr addr;
2442
2443 pr_info("ipv6: addrconf_gre_config(%s)\n", dev->name);
2444
2445 ASSERT_RTNL();
2446
2447 if ((idev = ipv6_find_idev(dev)) == NULL) {
2448 printk(KERN_DEBUG "init gre: add_dev failed\n");
2449 return;
2450 }
2451
2452 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2453 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2454
2455 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2456 addrconf_add_linklocal(idev, &addr);
2457 }
2458 #endif
2459
2460 static inline int
2461 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2462 {
2463 struct in6_addr lladdr;
2464
2465 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2466 addrconf_add_linklocal(idev, &lladdr);
2467 return 0;
2468 }
2469 return -1;
2470 }
2471
2472 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2473 {
2474 struct net_device *link_dev;
2475 struct net *net = dev_net(idev->dev);
2476
2477 /* first try to inherit the link-local address from the link device */
2478 if (idev->dev->iflink &&
2479 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
2480 if (!ipv6_inherit_linklocal(idev, link_dev))
2481 return;
2482 }
2483 /* then try to inherit it from any device */
2484 for_each_netdev(net, link_dev) {
2485 if (!ipv6_inherit_linklocal(idev, link_dev))
2486 return;
2487 }
2488 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2489 }
2490
2491 /*
2492 * Autoconfigure tunnel with a link-local address so routing protocols,
2493 * DHCPv6, MLD etc. can be run over the virtual link
2494 */
2495
2496 static void addrconf_ip6_tnl_config(struct net_device *dev)
2497 {
2498 struct inet6_dev *idev;
2499
2500 ASSERT_RTNL();
2501
2502 idev = addrconf_add_dev(dev);
2503 if (IS_ERR(idev)) {
2504 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2505 return;
2506 }
2507 ip6_tnl_add_linklocal(idev);
2508 }
2509
2510 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2511 void * data)
2512 {
2513 struct net_device *dev = (struct net_device *) data;
2514 struct inet6_dev *idev = __in6_dev_get(dev);
2515 int run_pending = 0;
2516 int err;
2517
2518 switch (event) {
2519 case NETDEV_REGISTER:
2520 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2521 idev = ipv6_add_dev(dev);
2522 if (!idev)
2523 return notifier_from_errno(-ENOMEM);
2524 }
2525 break;
2526
2527 case NETDEV_UP:
2528 case NETDEV_CHANGE:
2529 if (dev->flags & IFF_SLAVE)
2530 break;
2531
2532 if (event == NETDEV_UP) {
2533 if (!addrconf_qdisc_ok(dev)) {
2534 /* device is not ready yet. */
2535 printk(KERN_INFO
2536 "ADDRCONF(NETDEV_UP): %s: "
2537 "link is not ready\n",
2538 dev->name);
2539 break;
2540 }
2541
2542 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2543 idev = ipv6_add_dev(dev);
2544
2545 if (idev) {
2546 idev->if_flags |= IF_READY;
2547 run_pending = 1;
2548 }
2549 } else {
2550 if (!addrconf_qdisc_ok(dev)) {
2551 /* device is still not ready. */
2552 break;
2553 }
2554
2555 if (idev) {
2556 if (idev->if_flags & IF_READY)
2557 /* device is already configured. */
2558 break;
2559 idev->if_flags |= IF_READY;
2560 }
2561
2562 printk(KERN_INFO
2563 "ADDRCONF(NETDEV_CHANGE): %s: "
2564 "link becomes ready\n",
2565 dev->name);
2566
2567 run_pending = 1;
2568 }
2569
2570 switch (dev->type) {
2571 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2572 case ARPHRD_SIT:
2573 addrconf_sit_config(dev);
2574 break;
2575 #endif
2576 #if defined(CONFIG_NET_IPGRE) || defined(CONFIG_NET_IPGRE_MODULE)
2577 case ARPHRD_IPGRE:
2578 addrconf_gre_config(dev);
2579 break;
2580 #endif
2581 case ARPHRD_TUNNEL6:
2582 addrconf_ip6_tnl_config(dev);
2583 break;
2584 case ARPHRD_LOOPBACK:
2585 init_loopback(dev);
2586 break;
2587
2588 default:
2589 addrconf_dev_config(dev);
2590 break;
2591 }
2592
2593 if (idev) {
2594 if (run_pending)
2595 addrconf_dad_run(idev);
2596
2597 /*
2598 * If the MTU changed during the interface down,
2599 * when the interface up, the changed MTU must be
2600 * reflected in the idev as well as routers.
2601 */
2602 if (idev->cnf.mtu6 != dev->mtu &&
2603 dev->mtu >= IPV6_MIN_MTU) {
2604 rt6_mtu_change(dev, dev->mtu);
2605 idev->cnf.mtu6 = dev->mtu;
2606 }
2607 idev->tstamp = jiffies;
2608 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2609
2610 /*
2611 * If the changed mtu during down is lower than
2612 * IPV6_MIN_MTU stop IPv6 on this interface.
2613 */
2614 if (dev->mtu < IPV6_MIN_MTU)
2615 addrconf_ifdown(dev, 1);
2616 }
2617 break;
2618
2619 case NETDEV_CHANGEMTU:
2620 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2621 rt6_mtu_change(dev, dev->mtu);
2622 idev->cnf.mtu6 = dev->mtu;
2623 break;
2624 }
2625
2626 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2627 idev = ipv6_add_dev(dev);
2628 if (idev)
2629 break;
2630 }
2631
2632 /*
2633 * MTU falled under IPV6_MIN_MTU.
2634 * Stop IPv6 on this interface.
2635 */
2636
2637 case NETDEV_DOWN:
2638 case NETDEV_UNREGISTER:
2639 /*
2640 * Remove all addresses from this interface.
2641 */
2642 addrconf_ifdown(dev, event != NETDEV_DOWN);
2643 break;
2644
2645 case NETDEV_CHANGENAME:
2646 if (idev) {
2647 snmp6_unregister_dev(idev);
2648 addrconf_sysctl_unregister(idev);
2649 addrconf_sysctl_register(idev);
2650 err = snmp6_register_dev(idev);
2651 if (err)
2652 return notifier_from_errno(err);
2653 }
2654 break;
2655
2656 case NETDEV_PRE_TYPE_CHANGE:
2657 case NETDEV_POST_TYPE_CHANGE:
2658 addrconf_type_change(dev, event);
2659 break;
2660 }
2661
2662 return NOTIFY_OK;
2663 }
2664
2665 /*
2666 * addrconf module should be notified of a device going up
2667 */
2668 static struct notifier_block ipv6_dev_notf = {
2669 .notifier_call = addrconf_notify,
2670 };
2671
2672 static void addrconf_type_change(struct net_device *dev, unsigned long event)
2673 {
2674 struct inet6_dev *idev;
2675 ASSERT_RTNL();
2676
2677 idev = __in6_dev_get(dev);
2678
2679 if (event == NETDEV_POST_TYPE_CHANGE)
2680 ipv6_mc_remap(idev);
2681 else if (event == NETDEV_PRE_TYPE_CHANGE)
2682 ipv6_mc_unmap(idev);
2683 }
2684
2685 static int addrconf_ifdown(struct net_device *dev, int how)
2686 {
2687 struct net *net = dev_net(dev);
2688 struct inet6_dev *idev;
2689 struct inet6_ifaddr *ifa;
2690 int state, i;
2691
2692 ASSERT_RTNL();
2693
2694 rt6_ifdown(net, dev);
2695 neigh_ifdown(&nd_tbl, dev);
2696
2697 idev = __in6_dev_get(dev);
2698 if (idev == NULL)
2699 return -ENODEV;
2700
2701 /*
2702 * Step 1: remove reference to ipv6 device from parent device.
2703 * Do not dev_put!
2704 */
2705 if (how) {
2706 idev->dead = 1;
2707
2708 /* protected by rtnl_lock */
2709 rcu_assign_pointer(dev->ip6_ptr, NULL);
2710
2711 /* Step 1.5: remove snmp6 entry */
2712 snmp6_unregister_dev(idev);
2713
2714 }
2715
2716 /* Step 2: clear hash table */
2717 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
2718 struct hlist_head *h = &inet6_addr_lst[i];
2719 struct hlist_node *n;
2720
2721 spin_lock_bh(&addrconf_hash_lock);
2722 restart:
2723 hlist_for_each_entry_rcu(ifa, n, h, addr_lst) {
2724 if (ifa->idev == idev) {
2725 hlist_del_init_rcu(&ifa->addr_lst);
2726 addrconf_del_timer(ifa);
2727 goto restart;
2728 }
2729 }
2730 spin_unlock_bh(&addrconf_hash_lock);
2731 }
2732
2733 write_lock_bh(&idev->lock);
2734
2735 /* Step 2: clear flags for stateless addrconf */
2736 if (!how)
2737 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2738
2739 #ifdef CONFIG_IPV6_PRIVACY
2740 if (how && del_timer(&idev->regen_timer))
2741 in6_dev_put(idev);
2742
2743 /* Step 3: clear tempaddr list */
2744 while (!list_empty(&idev->tempaddr_list)) {
2745 ifa = list_first_entry(&idev->tempaddr_list,
2746 struct inet6_ifaddr, tmp_list);
2747 list_del(&ifa->tmp_list);
2748 write_unlock_bh(&idev->lock);
2749 spin_lock_bh(&ifa->lock);
2750
2751 if (ifa->ifpub) {
2752 in6_ifa_put(ifa->ifpub);
2753 ifa->ifpub = NULL;
2754 }
2755 spin_unlock_bh(&ifa->lock);
2756 in6_ifa_put(ifa);
2757 write_lock_bh(&idev->lock);
2758 }
2759 #endif
2760
2761 while (!list_empty(&idev->addr_list)) {
2762 ifa = list_first_entry(&idev->addr_list,
2763 struct inet6_ifaddr, if_list);
2764 addrconf_del_timer(ifa);
2765
2766 list_del(&ifa->if_list);
2767
2768 write_unlock_bh(&idev->lock);
2769
2770 spin_lock_bh(&ifa->state_lock);
2771 state = ifa->state;
2772 ifa->state = INET6_IFADDR_STATE_DEAD;
2773 spin_unlock_bh(&ifa->state_lock);
2774
2775 if (state != INET6_IFADDR_STATE_DEAD) {
2776 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2777 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2778 }
2779 in6_ifa_put(ifa);
2780
2781 write_lock_bh(&idev->lock);
2782 }
2783
2784 write_unlock_bh(&idev->lock);
2785
2786 /* Step 5: Discard multicast list */
2787 if (how)
2788 ipv6_mc_destroy_dev(idev);
2789 else
2790 ipv6_mc_down(idev);
2791
2792 idev->tstamp = jiffies;
2793
2794 /* Last: Shot the device (if unregistered) */
2795 if (how) {
2796 addrconf_sysctl_unregister(idev);
2797 neigh_parms_release(&nd_tbl, idev->nd_parms);
2798 neigh_ifdown(&nd_tbl, dev);
2799 in6_dev_put(idev);
2800 }
2801 return 0;
2802 }
2803
2804 static void addrconf_rs_timer(unsigned long data)
2805 {
2806 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2807 struct inet6_dev *idev = ifp->idev;
2808
2809 read_lock(&idev->lock);
2810 if (idev->dead || !(idev->if_flags & IF_READY))
2811 goto out;
2812
2813 if (idev->cnf.forwarding)
2814 goto out;
2815
2816 /* Announcement received after solicitation was sent */
2817 if (idev->if_flags & IF_RA_RCVD)
2818 goto out;
2819
2820 spin_lock(&ifp->lock);
2821 if (ifp->probes++ < idev->cnf.rtr_solicits) {
2822 /* The wait after the last probe can be shorter */
2823 addrconf_mod_timer(ifp, AC_RS,
2824 (ifp->probes == idev->cnf.rtr_solicits) ?
2825 idev->cnf.rtr_solicit_delay :
2826 idev->cnf.rtr_solicit_interval);
2827 spin_unlock(&ifp->lock);
2828
2829 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2830 } else {
2831 spin_unlock(&ifp->lock);
2832 /*
2833 * Note: we do not support deprecated "all on-link"
2834 * assumption any longer.
2835 */
2836 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2837 idev->dev->name);
2838 }
2839
2840 out:
2841 read_unlock(&idev->lock);
2842 in6_ifa_put(ifp);
2843 }
2844
2845 /*
2846 * Duplicate Address Detection
2847 */
2848 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2849 {
2850 unsigned long rand_num;
2851 struct inet6_dev *idev = ifp->idev;
2852
2853 if (ifp->flags & IFA_F_OPTIMISTIC)
2854 rand_num = 0;
2855 else
2856 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2857
2858 ifp->probes = idev->cnf.dad_transmits;
2859 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2860 }
2861
2862 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2863 {
2864 struct inet6_dev *idev = ifp->idev;
2865 struct net_device *dev = idev->dev;
2866
2867 addrconf_join_solict(dev, &ifp->addr);
2868
2869 net_srandom(ifp->addr.s6_addr32[3]);
2870
2871 read_lock_bh(&idev->lock);
2872 spin_lock(&ifp->lock);
2873 if (ifp->state == INET6_IFADDR_STATE_DEAD)
2874 goto out;
2875
2876 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2877 idev->cnf.accept_dad < 1 ||
2878 !(ifp->flags&IFA_F_TENTATIVE) ||
2879 ifp->flags & IFA_F_NODAD) {
2880 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
2881 spin_unlock(&ifp->lock);
2882 read_unlock_bh(&idev->lock);
2883
2884 addrconf_dad_completed(ifp);
2885 return;
2886 }
2887
2888 if (!(idev->if_flags & IF_READY)) {
2889 spin_unlock(&ifp->lock);
2890 read_unlock_bh(&idev->lock);
2891 /*
2892 * If the device is not ready:
2893 * - keep it tentative if it is a permanent address.
2894 * - otherwise, kill it.
2895 */
2896 in6_ifa_hold(ifp);
2897 addrconf_dad_stop(ifp, 0);
2898 return;
2899 }
2900
2901 /*
2902 * Optimistic nodes can start receiving
2903 * Frames right away
2904 */
2905 if (ifp->flags & IFA_F_OPTIMISTIC)
2906 ip6_ins_rt(ifp->rt);
2907
2908 addrconf_dad_kick(ifp);
2909 out:
2910 spin_unlock(&ifp->lock);
2911 read_unlock_bh(&idev->lock);
2912 }
2913
2914 static void addrconf_dad_timer(unsigned long data)
2915 {
2916 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2917 struct inet6_dev *idev = ifp->idev;
2918 struct in6_addr mcaddr;
2919
2920 if (!ifp->probes && addrconf_dad_end(ifp))
2921 goto out;
2922
2923 read_lock(&idev->lock);
2924 if (idev->dead || !(idev->if_flags & IF_READY)) {
2925 read_unlock(&idev->lock);
2926 goto out;
2927 }
2928
2929 spin_lock(&ifp->lock);
2930 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
2931 spin_unlock(&ifp->lock);
2932 read_unlock(&idev->lock);
2933 goto out;
2934 }
2935
2936 if (ifp->probes == 0) {
2937 /*
2938 * DAD was successful
2939 */
2940
2941 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
2942 spin_unlock(&ifp->lock);
2943 read_unlock(&idev->lock);
2944
2945 addrconf_dad_completed(ifp);
2946
2947 goto out;
2948 }
2949
2950 ifp->probes--;
2951 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2952 spin_unlock(&ifp->lock);
2953 read_unlock(&idev->lock);
2954
2955 /* send a neighbour solicitation for our addr */
2956 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2957 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
2958 out:
2959 in6_ifa_put(ifp);
2960 }
2961
2962 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2963 {
2964 struct net_device *dev = ifp->idev->dev;
2965
2966 /*
2967 * Configure the address for reception. Now it is valid.
2968 */
2969
2970 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2971
2972 /* If added prefix is link local and forwarding is off,
2973 start sending router solicitations.
2974 */
2975
2976 if ((ifp->idev->cnf.forwarding == 0 ||
2977 ifp->idev->cnf.forwarding == 2) &&
2978 ifp->idev->cnf.rtr_solicits > 0 &&
2979 (dev->flags&IFF_LOOPBACK) == 0 &&
2980 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2981 /*
2982 * If a host as already performed a random delay
2983 * [...] as part of DAD [...] there is no need
2984 * to delay again before sending the first RS
2985 */
2986 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2987
2988 spin_lock_bh(&ifp->lock);
2989 ifp->probes = 1;
2990 ifp->idev->if_flags |= IF_RS_SENT;
2991 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2992 spin_unlock_bh(&ifp->lock);
2993 }
2994 }
2995
2996 static void addrconf_dad_run(struct inet6_dev *idev)
2997 {
2998 struct inet6_ifaddr *ifp;
2999
3000 read_lock_bh(&idev->lock);
3001 list_for_each_entry(ifp, &idev->addr_list, if_list) {
3002 spin_lock(&ifp->lock);
3003 if (ifp->flags & IFA_F_TENTATIVE &&
3004 ifp->state == INET6_IFADDR_STATE_DAD)
3005 addrconf_dad_kick(ifp);
3006 spin_unlock(&ifp->lock);
3007 }
3008 read_unlock_bh(&idev->lock);
3009 }
3010
3011 #ifdef CONFIG_PROC_FS
3012 struct if6_iter_state {
3013 struct seq_net_private p;
3014 int bucket;
3015 };
3016
3017 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
3018 {
3019 struct inet6_ifaddr *ifa = NULL;
3020 struct if6_iter_state *state = seq->private;
3021 struct net *net = seq_file_net(seq);
3022
3023 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3024 struct hlist_node *n;
3025 hlist_for_each_entry_rcu_bh(ifa, n, &inet6_addr_lst[state->bucket],
3026 addr_lst)
3027 if (net_eq(dev_net(ifa->idev->dev), net))
3028 return ifa;
3029 }
3030 return NULL;
3031 }
3032
3033 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3034 struct inet6_ifaddr *ifa)
3035 {
3036 struct if6_iter_state *state = seq->private;
3037 struct net *net = seq_file_net(seq);
3038 struct hlist_node *n = &ifa->addr_lst;
3039
3040 hlist_for_each_entry_continue_rcu_bh(ifa, n, addr_lst)
3041 if (net_eq(dev_net(ifa->idev->dev), net))
3042 return ifa;
3043
3044 while (++state->bucket < IN6_ADDR_HSIZE) {
3045 hlist_for_each_entry_rcu_bh(ifa, n,
3046 &inet6_addr_lst[state->bucket], addr_lst) {
3047 if (net_eq(dev_net(ifa->idev->dev), net))
3048 return ifa;
3049 }
3050 }
3051
3052 return NULL;
3053 }
3054
3055 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
3056 {
3057 struct inet6_ifaddr *ifa = if6_get_first(seq);
3058
3059 if (ifa)
3060 while (pos && (ifa = if6_get_next(seq, ifa)) != NULL)
3061 --pos;
3062 return pos ? NULL : ifa;
3063 }
3064
3065 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3066 __acquires(rcu_bh)
3067 {
3068 rcu_read_lock_bh();
3069 return if6_get_idx(seq, *pos);
3070 }
3071
3072 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3073 {
3074 struct inet6_ifaddr *ifa;
3075
3076 ifa = if6_get_next(seq, v);
3077 ++*pos;
3078 return ifa;
3079 }
3080
3081 static void if6_seq_stop(struct seq_file *seq, void *v)
3082 __releases(rcu_bh)
3083 {
3084 rcu_read_unlock_bh();
3085 }
3086
3087 static int if6_seq_show(struct seq_file *seq, void *v)
3088 {
3089 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3090 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3091 &ifp->addr,
3092 ifp->idev->dev->ifindex,
3093 ifp->prefix_len,
3094 ifp->scope,
3095 ifp->flags,
3096 ifp->idev->dev->name);
3097 return 0;
3098 }
3099
3100 static const struct seq_operations if6_seq_ops = {
3101 .start = if6_seq_start,
3102 .next = if6_seq_next,
3103 .show = if6_seq_show,
3104 .stop = if6_seq_stop,
3105 };
3106
3107 static int if6_seq_open(struct inode *inode, struct file *file)
3108 {
3109 return seq_open_net(inode, file, &if6_seq_ops,
3110 sizeof(struct if6_iter_state));
3111 }
3112
3113 static const struct file_operations if6_fops = {
3114 .owner = THIS_MODULE,
3115 .open = if6_seq_open,
3116 .read = seq_read,
3117 .llseek = seq_lseek,
3118 .release = seq_release_net,
3119 };
3120
3121 static int __net_init if6_proc_net_init(struct net *net)
3122 {
3123 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
3124 return -ENOMEM;
3125 return 0;
3126 }
3127
3128 static void __net_exit if6_proc_net_exit(struct net *net)
3129 {
3130 proc_net_remove(net, "if_inet6");
3131 }
3132
3133 static struct pernet_operations if6_proc_net_ops = {
3134 .init = if6_proc_net_init,
3135 .exit = if6_proc_net_exit,
3136 };
3137
3138 int __init if6_proc_init(void)
3139 {
3140 return register_pernet_subsys(&if6_proc_net_ops);
3141 }
3142
3143 void if6_proc_exit(void)
3144 {
3145 unregister_pernet_subsys(&if6_proc_net_ops);
3146 }
3147 #endif /* CONFIG_PROC_FS */
3148
3149 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3150 /* Check if address is a home address configured on any interface. */
3151 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3152 {
3153 int ret = 0;
3154 struct inet6_ifaddr *ifp = NULL;
3155 struct hlist_node *n;
3156 unsigned int hash = ipv6_addr_hash(addr);
3157
3158 rcu_read_lock_bh();
3159 hlist_for_each_entry_rcu_bh(ifp, n, &inet6_addr_lst[hash], addr_lst) {
3160 if (!net_eq(dev_net(ifp->idev->dev), net))
3161 continue;
3162 if (ipv6_addr_equal(&ifp->addr, addr) &&
3163 (ifp->flags & IFA_F_HOMEADDRESS)) {
3164 ret = 1;
3165 break;
3166 }
3167 }
3168 rcu_read_unlock_bh();
3169 return ret;
3170 }
3171 #endif
3172
3173 /*
3174 * Periodic address status verification
3175 */
3176
3177 static void addrconf_verify(unsigned long foo)
3178 {
3179 unsigned long now, next, next_sec, next_sched;
3180 struct inet6_ifaddr *ifp;
3181 struct hlist_node *node;
3182 int i;
3183
3184 rcu_read_lock_bh();
3185 spin_lock(&addrconf_verify_lock);
3186 now = jiffies;
3187 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3188
3189 del_timer(&addr_chk_timer);
3190
3191 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3192 restart:
3193 hlist_for_each_entry_rcu_bh(ifp, node,
3194 &inet6_addr_lst[i], addr_lst) {
3195 unsigned long age;
3196
3197 if (ifp->flags & IFA_F_PERMANENT)
3198 continue;
3199
3200 spin_lock(&ifp->lock);
3201 /* We try to batch several events at once. */
3202 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3203
3204 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3205 age >= ifp->valid_lft) {
3206 spin_unlock(&ifp->lock);
3207 in6_ifa_hold(ifp);
3208 ipv6_del_addr(ifp);
3209 goto restart;
3210 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3211 spin_unlock(&ifp->lock);
3212 continue;
3213 } else if (age >= ifp->prefered_lft) {
3214 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3215 int deprecate = 0;
3216
3217 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3218 deprecate = 1;
3219 ifp->flags |= IFA_F_DEPRECATED;
3220 }
3221
3222 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3223 next = ifp->tstamp + ifp->valid_lft * HZ;
3224
3225 spin_unlock(&ifp->lock);
3226
3227 if (deprecate) {
3228 in6_ifa_hold(ifp);
3229
3230 ipv6_ifa_notify(0, ifp);
3231 in6_ifa_put(ifp);
3232 goto restart;
3233 }
3234 #ifdef CONFIG_IPV6_PRIVACY
3235 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3236 !(ifp->flags&IFA_F_TENTATIVE)) {
3237 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3238 ifp->idev->cnf.dad_transmits *
3239 ifp->idev->nd_parms->retrans_time / HZ;
3240
3241 if (age >= ifp->prefered_lft - regen_advance) {
3242 struct inet6_ifaddr *ifpub = ifp->ifpub;
3243 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3244 next = ifp->tstamp + ifp->prefered_lft * HZ;
3245 if (!ifp->regen_count && ifpub) {
3246 ifp->regen_count++;
3247 in6_ifa_hold(ifp);
3248 in6_ifa_hold(ifpub);
3249 spin_unlock(&ifp->lock);
3250
3251 spin_lock(&ifpub->lock);
3252 ifpub->regen_count = 0;
3253 spin_unlock(&ifpub->lock);
3254 ipv6_create_tempaddr(ifpub, ifp);
3255 in6_ifa_put(ifpub);
3256 in6_ifa_put(ifp);
3257 goto restart;
3258 }
3259 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3260 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3261 spin_unlock(&ifp->lock);
3262 #endif
3263 } else {
3264 /* ifp->prefered_lft <= ifp->valid_lft */
3265 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3266 next = ifp->tstamp + ifp->prefered_lft * HZ;
3267 spin_unlock(&ifp->lock);
3268 }
3269 }
3270 }
3271
3272 next_sec = round_jiffies_up(next);
3273 next_sched = next;
3274
3275 /* If rounded timeout is accurate enough, accept it. */
3276 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3277 next_sched = next_sec;
3278
3279 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3280 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3281 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3282
3283 ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3284 now, next, next_sec, next_sched));
3285
3286 addr_chk_timer.expires = next_sched;
3287 add_timer(&addr_chk_timer);
3288 spin_unlock(&addrconf_verify_lock);
3289 rcu_read_unlock_bh();
3290 }
3291
3292 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3293 {
3294 struct in6_addr *pfx = NULL;
3295
3296 if (addr)
3297 pfx = nla_data(addr);
3298
3299 if (local) {
3300 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3301 pfx = NULL;
3302 else
3303 pfx = nla_data(local);
3304 }
3305
3306 return pfx;
3307 }
3308
3309 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3310 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3311 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3312 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3313 };
3314
3315 static int
3316 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3317 {
3318 struct net *net = sock_net(skb->sk);
3319 struct ifaddrmsg *ifm;
3320 struct nlattr *tb[IFA_MAX+1];
3321 struct in6_addr *pfx;
3322 int err;
3323
3324 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3325 if (err < 0)
3326 return err;
3327
3328 ifm = nlmsg_data(nlh);
3329 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3330 if (pfx == NULL)
3331 return -EINVAL;
3332
3333 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3334 }
3335
3336 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3337 u32 prefered_lft, u32 valid_lft)
3338 {
3339 u32 flags;
3340 clock_t expires;
3341 unsigned long timeout;
3342
3343 if (!valid_lft || (prefered_lft > valid_lft))
3344 return -EINVAL;
3345
3346 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3347 if (addrconf_finite_timeout(timeout)) {
3348 expires = jiffies_to_clock_t(timeout * HZ);
3349 valid_lft = timeout;
3350 flags = RTF_EXPIRES;
3351 } else {
3352 expires = 0;
3353 flags = 0;
3354 ifa_flags |= IFA_F_PERMANENT;
3355 }
3356
3357 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3358 if (addrconf_finite_timeout(timeout)) {
3359 if (timeout == 0)
3360 ifa_flags |= IFA_F_DEPRECATED;
3361 prefered_lft = timeout;
3362 }
3363
3364 spin_lock_bh(&ifp->lock);
3365 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3366 ifp->tstamp = jiffies;
3367 ifp->valid_lft = valid_lft;
3368 ifp->prefered_lft = prefered_lft;
3369
3370 spin_unlock_bh(&ifp->lock);
3371 if (!(ifp->flags&IFA_F_TENTATIVE))
3372 ipv6_ifa_notify(0, ifp);
3373
3374 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3375 expires, flags);
3376 addrconf_verify(0);
3377
3378 return 0;
3379 }
3380
3381 static int
3382 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3383 {
3384 struct net *net = sock_net(skb->sk);
3385 struct ifaddrmsg *ifm;
3386 struct nlattr *tb[IFA_MAX+1];
3387 struct in6_addr *pfx;
3388 struct inet6_ifaddr *ifa;
3389 struct net_device *dev;
3390 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3391 u8 ifa_flags;
3392 int err;
3393
3394 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3395 if (err < 0)
3396 return err;
3397
3398 ifm = nlmsg_data(nlh);
3399 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3400 if (pfx == NULL)
3401 return -EINVAL;
3402
3403 if (tb[IFA_CACHEINFO]) {
3404 struct ifa_cacheinfo *ci;
3405
3406 ci = nla_data(tb[IFA_CACHEINFO]);
3407 valid_lft = ci->ifa_valid;
3408 preferred_lft = ci->ifa_prefered;
3409 } else {
3410 preferred_lft = INFINITY_LIFE_TIME;
3411 valid_lft = INFINITY_LIFE_TIME;
3412 }
3413
3414 dev = __dev_get_by_index(net, ifm->ifa_index);
3415 if (dev == NULL)
3416 return -ENODEV;
3417
3418 /* We ignore other flags so far. */
3419 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3420
3421 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3422 if (ifa == NULL) {
3423 /*
3424 * It would be best to check for !NLM_F_CREATE here but
3425 * userspace alreay relies on not having to provide this.
3426 */
3427 return inet6_addr_add(net, ifm->ifa_index, pfx,
3428 ifm->ifa_prefixlen, ifa_flags,
3429 preferred_lft, valid_lft);
3430 }
3431
3432 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3433 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3434 err = -EEXIST;
3435 else
3436 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3437
3438 in6_ifa_put(ifa);
3439
3440 return err;
3441 }
3442
3443 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3444 u8 scope, int ifindex)
3445 {
3446 struct ifaddrmsg *ifm;
3447
3448 ifm = nlmsg_data(nlh);
3449 ifm->ifa_family = AF_INET6;
3450 ifm->ifa_prefixlen = prefixlen;
3451 ifm->ifa_flags = flags;
3452 ifm->ifa_scope = scope;
3453 ifm->ifa_index = ifindex;
3454 }
3455
3456 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3457 unsigned long tstamp, u32 preferred, u32 valid)
3458 {
3459 struct ifa_cacheinfo ci;
3460
3461 ci.cstamp = cstamp_delta(cstamp);
3462 ci.tstamp = cstamp_delta(tstamp);
3463 ci.ifa_prefered = preferred;
3464 ci.ifa_valid = valid;
3465
3466 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3467 }
3468
3469 static inline int rt_scope(int ifa_scope)
3470 {
3471 if (ifa_scope & IFA_HOST)
3472 return RT_SCOPE_HOST;
3473 else if (ifa_scope & IFA_LINK)
3474 return RT_SCOPE_LINK;
3475 else if (ifa_scope & IFA_SITE)
3476 return RT_SCOPE_SITE;
3477 else
3478 return RT_SCOPE_UNIVERSE;
3479 }
3480
3481 static inline int inet6_ifaddr_msgsize(void)
3482 {
3483 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3484 + nla_total_size(16) /* IFA_ADDRESS */
3485 + nla_total_size(sizeof(struct ifa_cacheinfo));
3486 }
3487
3488 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3489 u32 pid, u32 seq, int event, unsigned int flags)
3490 {
3491 struct nlmsghdr *nlh;
3492 u32 preferred, valid;
3493
3494 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3495 if (nlh == NULL)
3496 return -EMSGSIZE;
3497
3498 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3499 ifa->idev->dev->ifindex);
3500
3501 if (!(ifa->flags&IFA_F_PERMANENT)) {
3502 preferred = ifa->prefered_lft;
3503 valid = ifa->valid_lft;
3504 if (preferred != INFINITY_LIFE_TIME) {
3505 long tval = (jiffies - ifa->tstamp)/HZ;
3506 if (preferred > tval)
3507 preferred -= tval;
3508 else
3509 preferred = 0;
3510 if (valid != INFINITY_LIFE_TIME) {
3511 if (valid > tval)
3512 valid -= tval;
3513 else
3514 valid = 0;
3515 }
3516 }
3517 } else {
3518 preferred = INFINITY_LIFE_TIME;
3519 valid = INFINITY_LIFE_TIME;
3520 }
3521
3522 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3523 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3524 nlmsg_cancel(skb, nlh);
3525 return -EMSGSIZE;
3526 }
3527
3528 return nlmsg_end(skb, nlh);
3529 }
3530
3531 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3532 u32 pid, u32 seq, int event, u16 flags)
3533 {
3534 struct nlmsghdr *nlh;
3535 u8 scope = RT_SCOPE_UNIVERSE;
3536 int ifindex = ifmca->idev->dev->ifindex;
3537
3538 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3539 scope = RT_SCOPE_SITE;
3540
3541 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3542 if (nlh == NULL)
3543 return -EMSGSIZE;
3544
3545 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3546 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3547 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3548 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3549 nlmsg_cancel(skb, nlh);
3550 return -EMSGSIZE;
3551 }
3552
3553 return nlmsg_end(skb, nlh);
3554 }
3555
3556 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3557 u32 pid, u32 seq, int event, unsigned int flags)
3558 {
3559 struct nlmsghdr *nlh;
3560 u8 scope = RT_SCOPE_UNIVERSE;
3561 int ifindex = ifaca->aca_idev->dev->ifindex;
3562
3563 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3564 scope = RT_SCOPE_SITE;
3565
3566 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3567 if (nlh == NULL)
3568 return -EMSGSIZE;
3569
3570 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3571 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3572 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3573 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3574 nlmsg_cancel(skb, nlh);
3575 return -EMSGSIZE;
3576 }
3577
3578 return nlmsg_end(skb, nlh);
3579 }
3580
3581 enum addr_type_t {
3582 UNICAST_ADDR,
3583 MULTICAST_ADDR,
3584 ANYCAST_ADDR,
3585 };
3586
3587 /* called with rcu_read_lock() */
3588 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3589 struct netlink_callback *cb, enum addr_type_t type,
3590 int s_ip_idx, int *p_ip_idx)
3591 {
3592 struct ifmcaddr6 *ifmca;
3593 struct ifacaddr6 *ifaca;
3594 int err = 1;
3595 int ip_idx = *p_ip_idx;
3596
3597 read_lock_bh(&idev->lock);
3598 switch (type) {
3599 case UNICAST_ADDR: {
3600 struct inet6_ifaddr *ifa;
3601
3602 /* unicast address incl. temp addr */
3603 list_for_each_entry(ifa, &idev->addr_list, if_list) {
3604 if (++ip_idx < s_ip_idx)
3605 continue;
3606 err = inet6_fill_ifaddr(skb, ifa,
3607 NETLINK_CB(cb->skb).pid,
3608 cb->nlh->nlmsg_seq,
3609 RTM_NEWADDR,
3610 NLM_F_MULTI);
3611 if (err <= 0)
3612 break;
3613 }
3614 break;
3615 }
3616 case MULTICAST_ADDR:
3617 /* multicast address */
3618 for (ifmca = idev->mc_list; ifmca;
3619 ifmca = ifmca->next, ip_idx++) {
3620 if (ip_idx < s_ip_idx)
3621 continue;
3622 err = inet6_fill_ifmcaddr(skb, ifmca,
3623 NETLINK_CB(cb->skb).pid,
3624 cb->nlh->nlmsg_seq,
3625 RTM_GETMULTICAST,
3626 NLM_F_MULTI);
3627 if (err <= 0)
3628 break;
3629 }
3630 break;
3631 case ANYCAST_ADDR:
3632 /* anycast address */
3633 for (ifaca = idev->ac_list; ifaca;
3634 ifaca = ifaca->aca_next, ip_idx++) {
3635 if (ip_idx < s_ip_idx)
3636 continue;
3637 err = inet6_fill_ifacaddr(skb, ifaca,
3638 NETLINK_CB(cb->skb).pid,
3639 cb->nlh->nlmsg_seq,
3640 RTM_GETANYCAST,
3641 NLM_F_MULTI);
3642 if (err <= 0)
3643 break;
3644 }
3645 break;
3646 default:
3647 break;
3648 }
3649 read_unlock_bh(&idev->lock);
3650 *p_ip_idx = ip_idx;
3651 return err;
3652 }
3653
3654 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3655 enum addr_type_t type)
3656 {
3657 struct net *net = sock_net(skb->sk);
3658 int h, s_h;
3659 int idx, ip_idx;
3660 int s_idx, s_ip_idx;
3661 struct net_device *dev;
3662 struct inet6_dev *idev;
3663 struct hlist_head *head;
3664 struct hlist_node *node;
3665
3666 s_h = cb->args[0];
3667 s_idx = idx = cb->args[1];
3668 s_ip_idx = ip_idx = cb->args[2];
3669
3670 rcu_read_lock();
3671 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3672 idx = 0;
3673 head = &net->dev_index_head[h];
3674 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3675 if (idx < s_idx)
3676 goto cont;
3677 if (h > s_h || idx > s_idx)
3678 s_ip_idx = 0;
3679 ip_idx = 0;
3680 idev = __in6_dev_get(dev);
3681 if (!idev)
3682 goto cont;
3683
3684 if (in6_dump_addrs(idev, skb, cb, type,
3685 s_ip_idx, &ip_idx) <= 0)
3686 goto done;
3687 cont:
3688 idx++;
3689 }
3690 }
3691 done:
3692 rcu_read_unlock();
3693 cb->args[0] = h;
3694 cb->args[1] = idx;
3695 cb->args[2] = ip_idx;
3696
3697 return skb->len;
3698 }
3699
3700 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3701 {
3702 enum addr_type_t type = UNICAST_ADDR;
3703
3704 return inet6_dump_addr(skb, cb, type);
3705 }
3706
3707 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3708 {
3709 enum addr_type_t type = MULTICAST_ADDR;
3710
3711 return inet6_dump_addr(skb, cb, type);
3712 }
3713
3714
3715 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3716 {
3717 enum addr_type_t type = ANYCAST_ADDR;
3718
3719 return inet6_dump_addr(skb, cb, type);
3720 }
3721
3722 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3723 void *arg)
3724 {
3725 struct net *net = sock_net(in_skb->sk);
3726 struct ifaddrmsg *ifm;
3727 struct nlattr *tb[IFA_MAX+1];
3728 struct in6_addr *addr = NULL;
3729 struct net_device *dev = NULL;
3730 struct inet6_ifaddr *ifa;
3731 struct sk_buff *skb;
3732 int err;
3733
3734 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3735 if (err < 0)
3736 goto errout;
3737
3738 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3739 if (addr == NULL) {
3740 err = -EINVAL;
3741 goto errout;
3742 }
3743
3744 ifm = nlmsg_data(nlh);
3745 if (ifm->ifa_index)
3746 dev = __dev_get_by_index(net, ifm->ifa_index);
3747
3748 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
3749 if (!ifa) {
3750 err = -EADDRNOTAVAIL;
3751 goto errout;
3752 }
3753
3754 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
3755 if (!skb) {
3756 err = -ENOBUFS;
3757 goto errout_ifa;
3758 }
3759
3760 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3761 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3762 if (err < 0) {
3763 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3764 WARN_ON(err == -EMSGSIZE);
3765 kfree_skb(skb);
3766 goto errout_ifa;
3767 }
3768 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
3769 errout_ifa:
3770 in6_ifa_put(ifa);
3771 errout:
3772 return err;
3773 }
3774
3775 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3776 {
3777 struct sk_buff *skb;
3778 struct net *net = dev_net(ifa->idev->dev);
3779 int err = -ENOBUFS;
3780
3781 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3782 if (skb == NULL)
3783 goto errout;
3784
3785 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3786 if (err < 0) {
3787 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3788 WARN_ON(err == -EMSGSIZE);
3789 kfree_skb(skb);
3790 goto errout;
3791 }
3792 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3793 return;
3794 errout:
3795 if (err < 0)
3796 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3797 }
3798
3799 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3800 __s32 *array, int bytes)
3801 {
3802 BUG_ON(bytes < (DEVCONF_MAX * 4));
3803
3804 memset(array, 0, bytes);
3805 array[DEVCONF_FORWARDING] = cnf->forwarding;
3806 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3807 array[DEVCONF_MTU6] = cnf->mtu6;
3808 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3809 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3810 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3811 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3812 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3813 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
3814 jiffies_to_msecs(cnf->rtr_solicit_interval);
3815 array[DEVCONF_RTR_SOLICIT_DELAY] =
3816 jiffies_to_msecs(cnf->rtr_solicit_delay);
3817 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3818 #ifdef CONFIG_IPV6_PRIVACY
3819 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3820 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3821 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3822 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3823 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3824 #endif
3825 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3826 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3827 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3828 #ifdef CONFIG_IPV6_ROUTER_PREF
3829 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3830 array[DEVCONF_RTR_PROBE_INTERVAL] =
3831 jiffies_to_msecs(cnf->rtr_probe_interval);
3832 #ifdef CONFIG_IPV6_ROUTE_INFO
3833 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3834 #endif
3835 #endif
3836 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3837 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3838 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3839 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3840 #endif
3841 #ifdef CONFIG_IPV6_MROUTE
3842 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
3843 #endif
3844 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
3845 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
3846 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
3847 }
3848
3849 static inline size_t inet6_ifla6_size(void)
3850 {
3851 return nla_total_size(4) /* IFLA_INET6_FLAGS */
3852 + nla_total_size(sizeof(struct ifla_cacheinfo))
3853 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3854 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3855 + nla_total_size(ICMP6_MIB_MAX * 8); /* IFLA_INET6_ICMP6STATS */
3856 }
3857
3858 static inline size_t inet6_if_nlmsg_size(void)
3859 {
3860 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3861 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3862 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3863 + nla_total_size(4) /* IFLA_MTU */
3864 + nla_total_size(4) /* IFLA_LINK */
3865 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
3866 }
3867
3868 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
3869 int items, int bytes)
3870 {
3871 int i;
3872 int pad = bytes - sizeof(u64) * items;
3873 BUG_ON(pad < 0);
3874
3875 /* Use put_unaligned() because stats may not be aligned for u64. */
3876 put_unaligned(items, &stats[0]);
3877 for (i = 1; i < items; i++)
3878 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
3879
3880 memset(&stats[items], 0, pad);
3881 }
3882
3883 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib,
3884 int items, int bytes, size_t syncpoff)
3885 {
3886 int i;
3887 int pad = bytes - sizeof(u64) * items;
3888 BUG_ON(pad < 0);
3889
3890 /* Use put_unaligned() because stats may not be aligned for u64. */
3891 put_unaligned(items, &stats[0]);
3892 for (i = 1; i < items; i++)
3893 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
3894
3895 memset(&stats[items], 0, pad);
3896 }
3897
3898 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3899 int bytes)
3900 {
3901 switch (attrtype) {
3902 case IFLA_INET6_STATS:
3903 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6,
3904 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
3905 break;
3906 case IFLA_INET6_ICMP6STATS:
3907 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
3908 break;
3909 }
3910 }
3911
3912 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
3913 {
3914 struct nlattr *nla;
3915 struct ifla_cacheinfo ci;
3916
3917 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
3918
3919 ci.max_reasm_len = IPV6_MAXPLEN;
3920 ci.tstamp = cstamp_delta(idev->tstamp);
3921 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
3922 ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time);
3923 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3924
3925 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3926 if (nla == NULL)
3927 goto nla_put_failure;
3928 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
3929
3930 /* XXX - MC not implemented */
3931
3932 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3933 if (nla == NULL)
3934 goto nla_put_failure;
3935 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3936
3937 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3938 if (nla == NULL)
3939 goto nla_put_failure;
3940 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
3941
3942 return 0;
3943
3944 nla_put_failure:
3945 return -EMSGSIZE;
3946 }
3947
3948 static size_t inet6_get_link_af_size(const struct net_device *dev)
3949 {
3950 if (!__in6_dev_get(dev))
3951 return 0;
3952
3953 return inet6_ifla6_size();
3954 }
3955
3956 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
3957 {
3958 struct inet6_dev *idev = __in6_dev_get(dev);
3959
3960 if (!idev)
3961 return -ENODATA;
3962
3963 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
3964 return -EMSGSIZE;
3965
3966 return 0;
3967 }
3968
3969 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3970 u32 pid, u32 seq, int event, unsigned int flags)
3971 {
3972 struct net_device *dev = idev->dev;
3973 struct ifinfomsg *hdr;
3974 struct nlmsghdr *nlh;
3975 void *protoinfo;
3976
3977 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3978 if (nlh == NULL)
3979 return -EMSGSIZE;
3980
3981 hdr = nlmsg_data(nlh);
3982 hdr->ifi_family = AF_INET6;
3983 hdr->__ifi_pad = 0;
3984 hdr->ifi_type = dev->type;
3985 hdr->ifi_index = dev->ifindex;
3986 hdr->ifi_flags = dev_get_flags(dev);
3987 hdr->ifi_change = 0;
3988
3989 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
3990
3991 if (dev->addr_len)
3992 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3993
3994 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
3995 if (dev->ifindex != dev->iflink)
3996 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
3997
3998 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3999 if (protoinfo == NULL)
4000 goto nla_put_failure;
4001
4002 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4003 goto nla_put_failure;
4004
4005 nla_nest_end(skb, protoinfo);
4006 return nlmsg_end(skb, nlh);
4007
4008 nla_put_failure:
4009 nlmsg_cancel(skb, nlh);
4010 return -EMSGSIZE;
4011 }
4012
4013 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4014 {
4015 struct net *net = sock_net(skb->sk);
4016 int h, s_h;
4017 int idx = 0, s_idx;
4018 struct net_device *dev;
4019 struct inet6_dev *idev;
4020 struct hlist_head *head;
4021 struct hlist_node *node;
4022
4023 s_h = cb->args[0];
4024 s_idx = cb->args[1];
4025
4026 rcu_read_lock();
4027 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4028 idx = 0;
4029 head = &net->dev_index_head[h];
4030 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
4031 if (idx < s_idx)
4032 goto cont;
4033 idev = __in6_dev_get(dev);
4034 if (!idev)
4035 goto cont;
4036 if (inet6_fill_ifinfo(skb, idev,
4037 NETLINK_CB(cb->skb).pid,
4038 cb->nlh->nlmsg_seq,
4039 RTM_NEWLINK, NLM_F_MULTI) <= 0)
4040 goto out;
4041 cont:
4042 idx++;
4043 }
4044 }
4045 out:
4046 rcu_read_unlock();
4047 cb->args[1] = idx;
4048 cb->args[0] = h;
4049
4050 return skb->len;
4051 }
4052
4053 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4054 {
4055 struct sk_buff *skb;
4056 struct net *net = dev_net(idev->dev);
4057 int err = -ENOBUFS;
4058
4059 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
4060 if (skb == NULL)
4061 goto errout;
4062
4063 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
4064 if (err < 0) {
4065 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4066 WARN_ON(err == -EMSGSIZE);
4067 kfree_skb(skb);
4068 goto errout;
4069 }
4070 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
4071 return;
4072 errout:
4073 if (err < 0)
4074 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
4075 }
4076
4077 static inline size_t inet6_prefix_nlmsg_size(void)
4078 {
4079 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4080 + nla_total_size(sizeof(struct in6_addr))
4081 + nla_total_size(sizeof(struct prefix_cacheinfo));
4082 }
4083
4084 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
4085 struct prefix_info *pinfo, u32 pid, u32 seq,
4086 int event, unsigned int flags)
4087 {
4088 struct prefixmsg *pmsg;
4089 struct nlmsghdr *nlh;
4090 struct prefix_cacheinfo ci;
4091
4092 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
4093 if (nlh == NULL)
4094 return -EMSGSIZE;
4095
4096 pmsg = nlmsg_data(nlh);
4097 pmsg->prefix_family = AF_INET6;
4098 pmsg->prefix_pad1 = 0;
4099 pmsg->prefix_pad2 = 0;
4100 pmsg->prefix_ifindex = idev->dev->ifindex;
4101 pmsg->prefix_len = pinfo->prefix_len;
4102 pmsg->prefix_type = pinfo->type;
4103 pmsg->prefix_pad3 = 0;
4104 pmsg->prefix_flags = 0;
4105 if (pinfo->onlink)
4106 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4107 if (pinfo->autoconf)
4108 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4109
4110 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
4111
4112 ci.preferred_time = ntohl(pinfo->prefered);
4113 ci.valid_time = ntohl(pinfo->valid);
4114 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
4115
4116 return nlmsg_end(skb, nlh);
4117
4118 nla_put_failure:
4119 nlmsg_cancel(skb, nlh);
4120 return -EMSGSIZE;
4121 }
4122
4123 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
4124 struct prefix_info *pinfo)
4125 {
4126 struct sk_buff *skb;
4127 struct net *net = dev_net(idev->dev);
4128 int err = -ENOBUFS;
4129
4130 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
4131 if (skb == NULL)
4132 goto errout;
4133
4134 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
4135 if (err < 0) {
4136 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4137 WARN_ON(err == -EMSGSIZE);
4138 kfree_skb(skb);
4139 goto errout;
4140 }
4141 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4142 return;
4143 errout:
4144 if (err < 0)
4145 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
4146 }
4147
4148 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4149 {
4150 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4151
4152 switch (event) {
4153 case RTM_NEWADDR:
4154 /*
4155 * If the address was optimistic
4156 * we inserted the route at the start of
4157 * our DAD process, so we don't need
4158 * to do it again
4159 */
4160 if (!(ifp->rt->rt6i_node))
4161 ip6_ins_rt(ifp->rt);
4162 if (ifp->idev->cnf.forwarding)
4163 addrconf_join_anycast(ifp);
4164 break;
4165 case RTM_DELADDR:
4166 if (ifp->idev->cnf.forwarding)
4167 addrconf_leave_anycast(ifp);
4168 addrconf_leave_solict(ifp->idev, &ifp->addr);
4169 dst_hold(&ifp->rt->dst);
4170
4171 if (ip6_del_rt(ifp->rt))
4172 dst_free(&ifp->rt->dst);
4173 break;
4174 }
4175 }
4176
4177 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4178 {
4179 rcu_read_lock_bh();
4180 if (likely(ifp->idev->dead == 0))
4181 __ipv6_ifa_notify(event, ifp);
4182 rcu_read_unlock_bh();
4183 }
4184
4185 #ifdef CONFIG_SYSCTL
4186
4187 static
4188 int addrconf_sysctl_forward(ctl_table *ctl, int write,
4189 void __user *buffer, size_t *lenp, loff_t *ppos)
4190 {
4191 int *valp = ctl->data;
4192 int val = *valp;
4193 loff_t pos = *ppos;
4194 int ret;
4195
4196 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
4197
4198 if (write)
4199 ret = addrconf_fixup_forwarding(ctl, valp, val);
4200 if (ret)
4201 *ppos = pos;
4202 return ret;
4203 }
4204
4205 static void dev_disable_change(struct inet6_dev *idev)
4206 {
4207 if (!idev || !idev->dev)
4208 return;
4209
4210 if (idev->cnf.disable_ipv6)
4211 addrconf_notify(NULL, NETDEV_DOWN, idev->dev);
4212 else
4213 addrconf_notify(NULL, NETDEV_UP, idev->dev);
4214 }
4215
4216 static void addrconf_disable_change(struct net *net, __s32 newf)
4217 {
4218 struct net_device *dev;
4219 struct inet6_dev *idev;
4220
4221 rcu_read_lock();
4222 for_each_netdev_rcu(net, dev) {
4223 idev = __in6_dev_get(dev);
4224 if (idev) {
4225 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4226 idev->cnf.disable_ipv6 = newf;
4227 if (changed)
4228 dev_disable_change(idev);
4229 }
4230 }
4231 rcu_read_unlock();
4232 }
4233
4234 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int old)
4235 {
4236 struct net *net;
4237
4238 net = (struct net *)table->extra2;
4239
4240 if (p == &net->ipv6.devconf_dflt->disable_ipv6)
4241 return 0;
4242
4243 if (!rtnl_trylock()) {
4244 /* Restore the original values before restarting */
4245 *p = old;
4246 return restart_syscall();
4247 }
4248
4249 if (p == &net->ipv6.devconf_all->disable_ipv6) {
4250 __s32 newf = net->ipv6.devconf_all->disable_ipv6;
4251 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4252 addrconf_disable_change(net, newf);
4253 } else if ((!*p) ^ (!old))
4254 dev_disable_change((struct inet6_dev *)table->extra1);
4255
4256 rtnl_unlock();
4257 return 0;
4258 }
4259
4260 static
4261 int addrconf_sysctl_disable(ctl_table *ctl, int write,
4262 void __user *buffer, size_t *lenp, loff_t *ppos)
4263 {
4264 int *valp = ctl->data;
4265 int val = *valp;
4266 loff_t pos = *ppos;
4267 int ret;
4268
4269 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
4270
4271 if (write)
4272 ret = addrconf_disable_ipv6(ctl, valp, val);
4273 if (ret)
4274 *ppos = pos;
4275 return ret;
4276 }
4277
4278 static struct addrconf_sysctl_table
4279 {
4280 struct ctl_table_header *sysctl_header;
4281 ctl_table addrconf_vars[DEVCONF_MAX+1];
4282 char *dev_name;
4283 } addrconf_sysctl __read_mostly = {
4284 .sysctl_header = NULL,
4285 .addrconf_vars = {
4286 {
4287 .procname = "forwarding",
4288 .data = &ipv6_devconf.forwarding,
4289 .maxlen = sizeof(int),
4290 .mode = 0644,
4291 .proc_handler = addrconf_sysctl_forward,
4292 },
4293 {
4294 .procname = "hop_limit",
4295 .data = &ipv6_devconf.hop_limit,
4296 .maxlen = sizeof(int),
4297 .mode = 0644,
4298 .proc_handler = proc_dointvec,
4299 },
4300 {
4301 .procname = "mtu",
4302 .data = &ipv6_devconf.mtu6,
4303 .maxlen = sizeof(int),
4304 .mode = 0644,
4305 .proc_handler = proc_dointvec,
4306 },
4307 {
4308 .procname = "accept_ra",
4309 .data = &ipv6_devconf.accept_ra,
4310 .maxlen = sizeof(int),
4311 .mode = 0644,
4312 .proc_handler = proc_dointvec,
4313 },
4314 {
4315 .procname = "accept_redirects",
4316 .data = &ipv6_devconf.accept_redirects,
4317 .maxlen = sizeof(int),
4318 .mode = 0644,
4319 .proc_handler = proc_dointvec,
4320 },
4321 {
4322 .procname = "autoconf",
4323 .data = &ipv6_devconf.autoconf,
4324 .maxlen = sizeof(int),
4325 .mode = 0644,
4326 .proc_handler = proc_dointvec,
4327 },
4328 {
4329 .procname = "dad_transmits",
4330 .data = &ipv6_devconf.dad_transmits,
4331 .maxlen = sizeof(int),
4332 .mode = 0644,
4333 .proc_handler = proc_dointvec,
4334 },
4335 {
4336 .procname = "router_solicitations",
4337 .data = &ipv6_devconf.rtr_solicits,
4338 .maxlen = sizeof(int),
4339 .mode = 0644,
4340 .proc_handler = proc_dointvec,
4341 },
4342 {
4343 .procname = "router_solicitation_interval",
4344 .data = &ipv6_devconf.rtr_solicit_interval,
4345 .maxlen = sizeof(int),
4346 .mode = 0644,
4347 .proc_handler = proc_dointvec_jiffies,
4348 },
4349 {
4350 .procname = "router_solicitation_delay",
4351 .data = &ipv6_devconf.rtr_solicit_delay,
4352 .maxlen = sizeof(int),
4353 .mode = 0644,
4354 .proc_handler = proc_dointvec_jiffies,
4355 },
4356 {
4357 .procname = "force_mld_version",
4358 .data = &ipv6_devconf.force_mld_version,
4359 .maxlen = sizeof(int),
4360 .mode = 0644,
4361 .proc_handler = proc_dointvec,
4362 },
4363 #ifdef CONFIG_IPV6_PRIVACY
4364 {
4365 .procname = "use_tempaddr",
4366 .data = &ipv6_devconf.use_tempaddr,
4367 .maxlen = sizeof(int),
4368 .mode = 0644,
4369 .proc_handler = proc_dointvec,
4370 },
4371 {
4372 .procname = "temp_valid_lft",
4373 .data = &ipv6_devconf.temp_valid_lft,
4374 .maxlen = sizeof(int),
4375 .mode = 0644,
4376 .proc_handler = proc_dointvec,
4377 },
4378 {
4379 .procname = "temp_prefered_lft",
4380 .data = &ipv6_devconf.temp_prefered_lft,
4381 .maxlen = sizeof(int),
4382 .mode = 0644,
4383 .proc_handler = proc_dointvec,
4384 },
4385 {
4386 .procname = "regen_max_retry",
4387 .data = &ipv6_devconf.regen_max_retry,
4388 .maxlen = sizeof(int),
4389 .mode = 0644,
4390 .proc_handler = proc_dointvec,
4391 },
4392 {
4393 .procname = "max_desync_factor",
4394 .data = &ipv6_devconf.max_desync_factor,
4395 .maxlen = sizeof(int),
4396 .mode = 0644,
4397 .proc_handler = proc_dointvec,
4398 },
4399 #endif
4400 {
4401 .procname = "max_addresses",
4402 .data = &ipv6_devconf.max_addresses,
4403 .maxlen = sizeof(int),
4404 .mode = 0644,
4405 .proc_handler = proc_dointvec,
4406 },
4407 {
4408 .procname = "accept_ra_defrtr",
4409 .data = &ipv6_devconf.accept_ra_defrtr,
4410 .maxlen = sizeof(int),
4411 .mode = 0644,
4412 .proc_handler = proc_dointvec,
4413 },
4414 {
4415 .procname = "accept_ra_pinfo",
4416 .data = &ipv6_devconf.accept_ra_pinfo,
4417 .maxlen = sizeof(int),
4418 .mode = 0644,
4419 .proc_handler = proc_dointvec,
4420 },
4421 #ifdef CONFIG_IPV6_ROUTER_PREF
4422 {
4423 .procname = "accept_ra_rtr_pref",
4424 .data = &ipv6_devconf.accept_ra_rtr_pref,
4425 .maxlen = sizeof(int),
4426 .mode = 0644,
4427 .proc_handler = proc_dointvec,
4428 },
4429 {
4430 .procname = "router_probe_interval",
4431 .data = &ipv6_devconf.rtr_probe_interval,
4432 .maxlen = sizeof(int),
4433 .mode = 0644,
4434 .proc_handler = proc_dointvec_jiffies,
4435 },
4436 #ifdef CONFIG_IPV6_ROUTE_INFO
4437 {
4438 .procname = "accept_ra_rt_info_max_plen",
4439 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4440 .maxlen = sizeof(int),
4441 .mode = 0644,
4442 .proc_handler = proc_dointvec,
4443 },
4444 #endif
4445 #endif
4446 {
4447 .procname = "proxy_ndp",
4448 .data = &ipv6_devconf.proxy_ndp,
4449 .maxlen = sizeof(int),
4450 .mode = 0644,
4451 .proc_handler = proc_dointvec,
4452 },
4453 {
4454 .procname = "accept_source_route",
4455 .data = &ipv6_devconf.accept_source_route,
4456 .maxlen = sizeof(int),
4457 .mode = 0644,
4458 .proc_handler = proc_dointvec,
4459 },
4460 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4461 {
4462 .procname = "optimistic_dad",
4463 .data = &ipv6_devconf.optimistic_dad,
4464 .maxlen = sizeof(int),
4465 .mode = 0644,
4466 .proc_handler = proc_dointvec,
4467
4468 },
4469 #endif
4470 #ifdef CONFIG_IPV6_MROUTE
4471 {
4472 .procname = "mc_forwarding",
4473 .data = &ipv6_devconf.mc_forwarding,
4474 .maxlen = sizeof(int),
4475 .mode = 0444,
4476 .proc_handler = proc_dointvec,
4477 },
4478 #endif
4479 {
4480 .procname = "disable_ipv6",
4481 .data = &ipv6_devconf.disable_ipv6,
4482 .maxlen = sizeof(int),
4483 .mode = 0644,
4484 .proc_handler = addrconf_sysctl_disable,
4485 },
4486 {
4487 .procname = "accept_dad",
4488 .data = &ipv6_devconf.accept_dad,
4489 .maxlen = sizeof(int),
4490 .mode = 0644,
4491 .proc_handler = proc_dointvec,
4492 },
4493 {
4494 .procname = "force_tllao",
4495 .data = &ipv6_devconf.force_tllao,
4496 .maxlen = sizeof(int),
4497 .mode = 0644,
4498 .proc_handler = proc_dointvec
4499 },
4500 {
4501 /* sentinel */
4502 }
4503 },
4504 };
4505
4506 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4507 struct inet6_dev *idev, struct ipv6_devconf *p)
4508 {
4509 int i;
4510 struct addrconf_sysctl_table *t;
4511
4512 #define ADDRCONF_CTL_PATH_DEV 3
4513
4514 struct ctl_path addrconf_ctl_path[] = {
4515 { .procname = "net", },
4516 { .procname = "ipv6", },
4517 { .procname = "conf", },
4518 { /* to be set */ },
4519 { },
4520 };
4521
4522
4523 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4524 if (t == NULL)
4525 goto out;
4526
4527 for (i = 0; t->addrconf_vars[i].data; i++) {
4528 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
4529 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4530 t->addrconf_vars[i].extra2 = net;
4531 }
4532
4533 /*
4534 * Make a copy of dev_name, because '.procname' is regarded as const
4535 * by sysctl and we wouldn't want anyone to change it under our feet
4536 * (see SIOCSIFNAME).
4537 */
4538 t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4539 if (!t->dev_name)
4540 goto free;
4541
4542 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
4543
4544 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
4545 t->addrconf_vars);
4546 if (t->sysctl_header == NULL)
4547 goto free_procname;
4548
4549 p->sysctl = t;
4550 return 0;
4551
4552 free_procname:
4553 kfree(t->dev_name);
4554 free:
4555 kfree(t);
4556 out:
4557 return -ENOBUFS;
4558 }
4559
4560 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4561 {
4562 struct addrconf_sysctl_table *t;
4563
4564 if (p->sysctl == NULL)
4565 return;
4566
4567 t = p->sysctl;
4568 p->sysctl = NULL;
4569 unregister_net_sysctl_table(t->sysctl_header);
4570 kfree(t->dev_name);
4571 kfree(t);
4572 }
4573
4574 static void addrconf_sysctl_register(struct inet6_dev *idev)
4575 {
4576 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
4577 &ndisc_ifinfo_sysctl_change);
4578 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
4579 idev, &idev->cnf);
4580 }
4581
4582 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
4583 {
4584 __addrconf_sysctl_unregister(&idev->cnf);
4585 neigh_sysctl_unregister(idev->nd_parms);
4586 }
4587
4588
4589 #endif
4590
4591 static int __net_init addrconf_init_net(struct net *net)
4592 {
4593 int err;
4594 struct ipv6_devconf *all, *dflt;
4595
4596 err = -ENOMEM;
4597 all = &ipv6_devconf;
4598 dflt = &ipv6_devconf_dflt;
4599
4600 if (!net_eq(net, &init_net)) {
4601 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4602 if (all == NULL)
4603 goto err_alloc_all;
4604
4605 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4606 if (dflt == NULL)
4607 goto err_alloc_dflt;
4608 } else {
4609 /* these will be inherited by all namespaces */
4610 dflt->autoconf = ipv6_defaults.autoconf;
4611 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
4612 }
4613
4614 net->ipv6.devconf_all = all;
4615 net->ipv6.devconf_dflt = dflt;
4616
4617 #ifdef CONFIG_SYSCTL
4618 err = __addrconf_sysctl_register(net, "all", NULL, all);
4619 if (err < 0)
4620 goto err_reg_all;
4621
4622 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
4623 if (err < 0)
4624 goto err_reg_dflt;
4625 #endif
4626 return 0;
4627
4628 #ifdef CONFIG_SYSCTL
4629 err_reg_dflt:
4630 __addrconf_sysctl_unregister(all);
4631 err_reg_all:
4632 kfree(dflt);
4633 #endif
4634 err_alloc_dflt:
4635 kfree(all);
4636 err_alloc_all:
4637 return err;
4638 }
4639
4640 static void __net_exit addrconf_exit_net(struct net *net)
4641 {
4642 #ifdef CONFIG_SYSCTL
4643 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4644 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4645 #endif
4646 if (!net_eq(net, &init_net)) {
4647 kfree(net->ipv6.devconf_dflt);
4648 kfree(net->ipv6.devconf_all);
4649 }
4650 }
4651
4652 static struct pernet_operations addrconf_ops = {
4653 .init = addrconf_init_net,
4654 .exit = addrconf_exit_net,
4655 };
4656
4657 /*
4658 * Device notifier
4659 */
4660
4661 int register_inet6addr_notifier(struct notifier_block *nb)
4662 {
4663 return atomic_notifier_chain_register(&inet6addr_chain, nb);
4664 }
4665 EXPORT_SYMBOL(register_inet6addr_notifier);
4666
4667 int unregister_inet6addr_notifier(struct notifier_block *nb)
4668 {
4669 return atomic_notifier_chain_unregister(&inet6addr_chain, nb);
4670 }
4671 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4672
4673 static struct rtnl_af_ops inet6_ops = {
4674 .family = AF_INET6,
4675 .fill_link_af = inet6_fill_link_af,
4676 .get_link_af_size = inet6_get_link_af_size,
4677 };
4678
4679 /*
4680 * Init / cleanup code
4681 */
4682
4683 int __init addrconf_init(void)
4684 {
4685 int i, err;
4686
4687 err = ipv6_addr_label_init();
4688 if (err < 0) {
4689 printk(KERN_CRIT "IPv6 Addrconf:"
4690 " cannot initialize default policy table: %d.\n", err);
4691 goto out;
4692 }
4693
4694 err = register_pernet_subsys(&addrconf_ops);
4695 if (err < 0)
4696 goto out_addrlabel;
4697
4698 /* The addrconf netdev notifier requires that loopback_dev
4699 * has it's ipv6 private information allocated and setup
4700 * before it can bring up and give link-local addresses
4701 * to other devices which are up.
4702 *
4703 * Unfortunately, loopback_dev is not necessarily the first
4704 * entry in the global dev_base list of net devices. In fact,
4705 * it is likely to be the very last entry on that list.
4706 * So this causes the notifier registry below to try and
4707 * give link-local addresses to all devices besides loopback_dev
4708 * first, then loopback_dev, which cases all the non-loopback_dev
4709 * devices to fail to get a link-local address.
4710 *
4711 * So, as a temporary fix, allocate the ipv6 structure for
4712 * loopback_dev first by hand.
4713 * Longer term, all of the dependencies ipv6 has upon the loopback
4714 * device and it being up should be removed.
4715 */
4716 rtnl_lock();
4717 if (!ipv6_add_dev(init_net.loopback_dev))
4718 err = -ENOMEM;
4719 rtnl_unlock();
4720 if (err)
4721 goto errlo;
4722
4723 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4724 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
4725
4726 register_netdevice_notifier(&ipv6_dev_notf);
4727
4728 addrconf_verify(0);
4729
4730 err = rtnl_af_register(&inet6_ops);
4731 if (err < 0)
4732 goto errout_af;
4733
4734 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
4735 NULL);
4736 if (err < 0)
4737 goto errout;
4738
4739 /* Only the first call to __rtnl_register can fail */
4740 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
4741 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
4742 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
4743 inet6_dump_ifaddr, NULL);
4744 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
4745 inet6_dump_ifmcaddr, NULL);
4746 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
4747 inet6_dump_ifacaddr, NULL);
4748
4749 ipv6_addr_label_rtnl_register();
4750
4751 return 0;
4752 errout:
4753 rtnl_af_unregister(&inet6_ops);
4754 errout_af:
4755 unregister_netdevice_notifier(&ipv6_dev_notf);
4756 errlo:
4757 unregister_pernet_subsys(&addrconf_ops);
4758 out_addrlabel:
4759 ipv6_addr_label_cleanup();
4760 out:
4761 return err;
4762 }
4763
4764 void addrconf_cleanup(void)
4765 {
4766 struct net_device *dev;
4767 int i;
4768
4769 unregister_netdevice_notifier(&ipv6_dev_notf);
4770 unregister_pernet_subsys(&addrconf_ops);
4771 ipv6_addr_label_cleanup();
4772
4773 rtnl_lock();
4774
4775 __rtnl_af_unregister(&inet6_ops);
4776
4777 /* clean dev list */
4778 for_each_netdev(&init_net, dev) {
4779 if (__in6_dev_get(dev) == NULL)
4780 continue;
4781 addrconf_ifdown(dev, 1);
4782 }
4783 addrconf_ifdown(init_net.loopback_dev, 2);
4784
4785 /*
4786 * Check hash table.
4787 */
4788 spin_lock_bh(&addrconf_hash_lock);
4789 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4790 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
4791 spin_unlock_bh(&addrconf_hash_lock);
4792
4793 del_timer(&addr_chk_timer);
4794 rtnl_unlock();
4795 }