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Merge branch 'next/fixes2' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/linux...
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / net / ipv6 / addrconf.c
1 /*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
9 * 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(&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 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1485 if (ipv6_addr_any(&addr))
1486 return;
1487 __ipv6_dev_ac_dec(ifp->idev, &addr);
1488 }
1489
1490 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1491 {
1492 if (dev->addr_len != ETH_ALEN)
1493 return -1;
1494 memcpy(eui, dev->dev_addr, 3);
1495 memcpy(eui + 5, dev->dev_addr + 3, 3);
1496
1497 /*
1498 * The zSeries OSA network cards can be shared among various
1499 * OS instances, but the OSA cards have only one MAC address.
1500 * This leads to duplicate address conflicts in conjunction
1501 * with IPv6 if more than one instance uses the same card.
1502 *
1503 * The driver for these cards can deliver a unique 16-bit
1504 * identifier for each instance sharing the same card. It is
1505 * placed instead of 0xFFFE in the interface identifier. The
1506 * "u" bit of the interface identifier is not inverted in this
1507 * case. Hence the resulting interface identifier has local
1508 * scope according to RFC2373.
1509 */
1510 if (dev->dev_id) {
1511 eui[3] = (dev->dev_id >> 8) & 0xFF;
1512 eui[4] = dev->dev_id & 0xFF;
1513 } else {
1514 eui[3] = 0xFF;
1515 eui[4] = 0xFE;
1516 eui[0] ^= 2;
1517 }
1518 return 0;
1519 }
1520
1521 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1522 {
1523 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1524 if (dev->addr_len != ARCNET_ALEN)
1525 return -1;
1526 memset(eui, 0, 7);
1527 eui[7] = *(u8*)dev->dev_addr;
1528 return 0;
1529 }
1530
1531 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1532 {
1533 if (dev->addr_len != INFINIBAND_ALEN)
1534 return -1;
1535 memcpy(eui, dev->dev_addr + 12, 8);
1536 eui[0] |= 2;
1537 return 0;
1538 }
1539
1540 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1541 {
1542 if (addr == 0)
1543 return -1;
1544 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1545 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1546 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1547 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1548 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1549 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1550 eui[1] = 0;
1551 eui[2] = 0x5E;
1552 eui[3] = 0xFE;
1553 memcpy(eui + 4, &addr, 4);
1554 return 0;
1555 }
1556
1557 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1558 {
1559 if (dev->priv_flags & IFF_ISATAP)
1560 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1561 return -1;
1562 }
1563
1564 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
1565 {
1566 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1567 }
1568
1569 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1570 {
1571 switch (dev->type) {
1572 case ARPHRD_ETHER:
1573 case ARPHRD_FDDI:
1574 case ARPHRD_IEEE802_TR:
1575 return addrconf_ifid_eui48(eui, dev);
1576 case ARPHRD_ARCNET:
1577 return addrconf_ifid_arcnet(eui, dev);
1578 case ARPHRD_INFINIBAND:
1579 return addrconf_ifid_infiniband(eui, dev);
1580 case ARPHRD_SIT:
1581 return addrconf_ifid_sit(eui, dev);
1582 case ARPHRD_IPGRE:
1583 return addrconf_ifid_gre(eui, dev);
1584 }
1585 return -1;
1586 }
1587
1588 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1589 {
1590 int err = -1;
1591 struct inet6_ifaddr *ifp;
1592
1593 read_lock_bh(&idev->lock);
1594 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1595 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1596 memcpy(eui, ifp->addr.s6_addr+8, 8);
1597 err = 0;
1598 break;
1599 }
1600 }
1601 read_unlock_bh(&idev->lock);
1602 return err;
1603 }
1604
1605 #ifdef CONFIG_IPV6_PRIVACY
1606 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1607 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1608 {
1609 regen:
1610 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1611 idev->rndid[0] &= ~0x02;
1612
1613 /*
1614 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1615 * check if generated address is not inappropriate
1616 *
1617 * - Reserved subnet anycast (RFC 2526)
1618 * 11111101 11....11 1xxxxxxx
1619 * - ISATAP (RFC4214) 6.1
1620 * 00-00-5E-FE-xx-xx-xx-xx
1621 * - value 0
1622 * - XXX: already assigned to an address on the device
1623 */
1624 if (idev->rndid[0] == 0xfd &&
1625 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1626 (idev->rndid[7]&0x80))
1627 goto regen;
1628 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1629 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1630 goto regen;
1631 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1632 goto regen;
1633 }
1634
1635 return 0;
1636 }
1637
1638 static void ipv6_regen_rndid(unsigned long data)
1639 {
1640 struct inet6_dev *idev = (struct inet6_dev *) data;
1641 unsigned long expires;
1642
1643 rcu_read_lock_bh();
1644 write_lock_bh(&idev->lock);
1645
1646 if (idev->dead)
1647 goto out;
1648
1649 if (__ipv6_regen_rndid(idev) < 0)
1650 goto out;
1651
1652 expires = jiffies +
1653 idev->cnf.temp_prefered_lft * HZ -
1654 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time -
1655 idev->cnf.max_desync_factor * HZ;
1656 if (time_before(expires, jiffies)) {
1657 printk(KERN_WARNING
1658 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1659 idev->dev->name);
1660 goto out;
1661 }
1662
1663 if (!mod_timer(&idev->regen_timer, expires))
1664 in6_dev_hold(idev);
1665
1666 out:
1667 write_unlock_bh(&idev->lock);
1668 rcu_read_unlock_bh();
1669 in6_dev_put(idev);
1670 }
1671
1672 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1673 int ret = 0;
1674
1675 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1676 ret = __ipv6_regen_rndid(idev);
1677 return ret;
1678 }
1679 #endif
1680
1681 /*
1682 * Add prefix route.
1683 */
1684
1685 static void
1686 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1687 unsigned long expires, u32 flags)
1688 {
1689 struct fib6_config cfg = {
1690 .fc_table = RT6_TABLE_PREFIX,
1691 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1692 .fc_ifindex = dev->ifindex,
1693 .fc_expires = expires,
1694 .fc_dst_len = plen,
1695 .fc_flags = RTF_UP | flags,
1696 .fc_nlinfo.nl_net = dev_net(dev),
1697 .fc_protocol = RTPROT_KERNEL,
1698 };
1699
1700 ipv6_addr_copy(&cfg.fc_dst, pfx);
1701
1702 /* Prevent useless cloning on PtP SIT.
1703 This thing is done here expecting that the whole
1704 class of non-broadcast devices need not cloning.
1705 */
1706 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1707 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1708 cfg.fc_flags |= RTF_NONEXTHOP;
1709 #endif
1710
1711 ip6_route_add(&cfg);
1712 }
1713
1714 /* Create "default" multicast route to the interface */
1715
1716 static void addrconf_add_mroute(struct net_device *dev)
1717 {
1718 struct fib6_config cfg = {
1719 .fc_table = RT6_TABLE_LOCAL,
1720 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1721 .fc_ifindex = dev->ifindex,
1722 .fc_dst_len = 8,
1723 .fc_flags = RTF_UP,
1724 .fc_nlinfo.nl_net = dev_net(dev),
1725 };
1726
1727 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1728
1729 ip6_route_add(&cfg);
1730 }
1731
1732 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1733 static void sit_route_add(struct net_device *dev)
1734 {
1735 struct fib6_config cfg = {
1736 .fc_table = RT6_TABLE_MAIN,
1737 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1738 .fc_ifindex = dev->ifindex,
1739 .fc_dst_len = 96,
1740 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1741 .fc_nlinfo.nl_net = dev_net(dev),
1742 };
1743
1744 /* prefix length - 96 bits "::d.d.d.d" */
1745 ip6_route_add(&cfg);
1746 }
1747 #endif
1748
1749 static void addrconf_add_lroute(struct net_device *dev)
1750 {
1751 struct in6_addr addr;
1752
1753 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1754 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1755 }
1756
1757 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1758 {
1759 struct inet6_dev *idev;
1760
1761 ASSERT_RTNL();
1762
1763 idev = ipv6_find_idev(dev);
1764 if (!idev)
1765 return ERR_PTR(-ENOBUFS);
1766
1767 if (idev->cnf.disable_ipv6)
1768 return ERR_PTR(-EACCES);
1769
1770 /* Add default multicast route */
1771 addrconf_add_mroute(dev);
1772
1773 /* Add link local route */
1774 addrconf_add_lroute(dev);
1775 return idev;
1776 }
1777
1778 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1779 {
1780 struct prefix_info *pinfo;
1781 __u32 valid_lft;
1782 __u32 prefered_lft;
1783 int addr_type;
1784 struct inet6_dev *in6_dev;
1785 struct net *net = dev_net(dev);
1786
1787 pinfo = (struct prefix_info *) opt;
1788
1789 if (len < sizeof(struct prefix_info)) {
1790 ADBG(("addrconf: prefix option too short\n"));
1791 return;
1792 }
1793
1794 /*
1795 * Validation checks ([ADDRCONF], page 19)
1796 */
1797
1798 addr_type = ipv6_addr_type(&pinfo->prefix);
1799
1800 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1801 return;
1802
1803 valid_lft = ntohl(pinfo->valid);
1804 prefered_lft = ntohl(pinfo->prefered);
1805
1806 if (prefered_lft > valid_lft) {
1807 if (net_ratelimit())
1808 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1809 return;
1810 }
1811
1812 in6_dev = in6_dev_get(dev);
1813
1814 if (in6_dev == NULL) {
1815 if (net_ratelimit())
1816 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1817 return;
1818 }
1819
1820 /*
1821 * Two things going on here:
1822 * 1) Add routes for on-link prefixes
1823 * 2) Configure prefixes with the auto flag set
1824 */
1825
1826 if (pinfo->onlink) {
1827 struct rt6_info *rt;
1828 unsigned long rt_expires;
1829
1830 /* Avoid arithmetic overflow. Really, we could
1831 * save rt_expires in seconds, likely valid_lft,
1832 * but it would require division in fib gc, that it
1833 * not good.
1834 */
1835 if (HZ > USER_HZ)
1836 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
1837 else
1838 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
1839
1840 if (addrconf_finite_timeout(rt_expires))
1841 rt_expires *= HZ;
1842
1843 rt = rt6_lookup(net, &pinfo->prefix, NULL,
1844 dev->ifindex, 1);
1845
1846 if (rt && addrconf_is_prefix_route(rt)) {
1847 /* Autoconf prefix route */
1848 if (valid_lft == 0) {
1849 ip6_del_rt(rt);
1850 rt = NULL;
1851 } else if (addrconf_finite_timeout(rt_expires)) {
1852 /* not infinity */
1853 rt->rt6i_expires = jiffies + rt_expires;
1854 rt->rt6i_flags |= RTF_EXPIRES;
1855 } else {
1856 rt->rt6i_flags &= ~RTF_EXPIRES;
1857 rt->rt6i_expires = 0;
1858 }
1859 } else if (valid_lft) {
1860 clock_t expires = 0;
1861 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
1862 if (addrconf_finite_timeout(rt_expires)) {
1863 /* not infinity */
1864 flags |= RTF_EXPIRES;
1865 expires = jiffies_to_clock_t(rt_expires);
1866 }
1867 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1868 dev, expires, flags);
1869 }
1870 if (rt)
1871 dst_release(&rt->dst);
1872 }
1873
1874 /* Try to figure out our local address for this prefix */
1875
1876 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1877 struct inet6_ifaddr * ifp;
1878 struct in6_addr addr;
1879 int create = 0, update_lft = 0;
1880
1881 if (pinfo->prefix_len == 64) {
1882 memcpy(&addr, &pinfo->prefix, 8);
1883 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1884 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1885 in6_dev_put(in6_dev);
1886 return;
1887 }
1888 goto ok;
1889 }
1890 if (net_ratelimit())
1891 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1892 pinfo->prefix_len);
1893 in6_dev_put(in6_dev);
1894 return;
1895
1896 ok:
1897
1898 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1899
1900 if (ifp == NULL && valid_lft) {
1901 int max_addresses = in6_dev->cnf.max_addresses;
1902 u32 addr_flags = 0;
1903
1904 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1905 if (in6_dev->cnf.optimistic_dad &&
1906 !net->ipv6.devconf_all->forwarding)
1907 addr_flags = IFA_F_OPTIMISTIC;
1908 #endif
1909
1910 /* Do not allow to create too much of autoconfigured
1911 * addresses; this would be too easy way to crash kernel.
1912 */
1913 if (!max_addresses ||
1914 ipv6_count_addresses(in6_dev) < max_addresses)
1915 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1916 addr_type&IPV6_ADDR_SCOPE_MASK,
1917 addr_flags);
1918
1919 if (!ifp || IS_ERR(ifp)) {
1920 in6_dev_put(in6_dev);
1921 return;
1922 }
1923
1924 update_lft = create = 1;
1925 ifp->cstamp = jiffies;
1926 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1927 }
1928
1929 if (ifp) {
1930 int flags;
1931 unsigned long now;
1932 #ifdef CONFIG_IPV6_PRIVACY
1933 struct inet6_ifaddr *ift;
1934 #endif
1935 u32 stored_lft;
1936
1937 /* update lifetime (RFC2462 5.5.3 e) */
1938 spin_lock(&ifp->lock);
1939 now = jiffies;
1940 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1941 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1942 else
1943 stored_lft = 0;
1944 if (!update_lft && stored_lft) {
1945 if (valid_lft > MIN_VALID_LIFETIME ||
1946 valid_lft > stored_lft)
1947 update_lft = 1;
1948 else if (stored_lft <= MIN_VALID_LIFETIME) {
1949 /* valid_lft <= stored_lft is always true */
1950 /*
1951 * RFC 4862 Section 5.5.3e:
1952 * "Note that the preferred lifetime of
1953 * the corresponding address is always
1954 * reset to the Preferred Lifetime in
1955 * the received Prefix Information
1956 * option, regardless of whether the
1957 * valid lifetime is also reset or
1958 * ignored."
1959 *
1960 * So if the preferred lifetime in
1961 * this advertisement is different
1962 * than what we have stored, but the
1963 * valid lifetime is invalid, just
1964 * reset prefered_lft.
1965 *
1966 * We must set the valid lifetime
1967 * to the stored lifetime since we'll
1968 * be updating the timestamp below,
1969 * else we'll set it back to the
1970 * minimum.
1971 */
1972 if (prefered_lft != ifp->prefered_lft) {
1973 valid_lft = stored_lft;
1974 update_lft = 1;
1975 }
1976 } else {
1977 valid_lft = MIN_VALID_LIFETIME;
1978 if (valid_lft < prefered_lft)
1979 prefered_lft = valid_lft;
1980 update_lft = 1;
1981 }
1982 }
1983
1984 if (update_lft) {
1985 ifp->valid_lft = valid_lft;
1986 ifp->prefered_lft = prefered_lft;
1987 ifp->tstamp = now;
1988 flags = ifp->flags;
1989 ifp->flags &= ~IFA_F_DEPRECATED;
1990 spin_unlock(&ifp->lock);
1991
1992 if (!(flags&IFA_F_TENTATIVE))
1993 ipv6_ifa_notify(0, ifp);
1994 } else
1995 spin_unlock(&ifp->lock);
1996
1997 #ifdef CONFIG_IPV6_PRIVACY
1998 read_lock_bh(&in6_dev->lock);
1999 /* update all temporary addresses in the list */
2000 list_for_each_entry(ift, &in6_dev->tempaddr_list, tmp_list) {
2001 /*
2002 * When adjusting the lifetimes of an existing
2003 * temporary address, only lower the lifetimes.
2004 * Implementations must not increase the
2005 * lifetimes of an existing temporary address
2006 * when processing a Prefix Information Option.
2007 */
2008 if (ifp != ift->ifpub)
2009 continue;
2010
2011 spin_lock(&ift->lock);
2012 flags = ift->flags;
2013 if (ift->valid_lft > valid_lft &&
2014 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
2015 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
2016 if (ift->prefered_lft > prefered_lft &&
2017 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
2018 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
2019 spin_unlock(&ift->lock);
2020 if (!(flags&IFA_F_TENTATIVE))
2021 ipv6_ifa_notify(0, ift);
2022 }
2023
2024 if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) {
2025 /*
2026 * When a new public address is created as described in [ADDRCONF],
2027 * also create a new temporary address. Also create a temporary
2028 * address if it's enabled but no temporary address currently exists.
2029 */
2030 read_unlock_bh(&in6_dev->lock);
2031 ipv6_create_tempaddr(ifp, NULL);
2032 } else {
2033 read_unlock_bh(&in6_dev->lock);
2034 }
2035 #endif
2036 in6_ifa_put(ifp);
2037 addrconf_verify(0);
2038 }
2039 }
2040 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2041 in6_dev_put(in6_dev);
2042 }
2043
2044 /*
2045 * Set destination address.
2046 * Special case for SIT interfaces where we create a new "virtual"
2047 * device.
2048 */
2049 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2050 {
2051 struct in6_ifreq ireq;
2052 struct net_device *dev;
2053 int err = -EINVAL;
2054
2055 rtnl_lock();
2056
2057 err = -EFAULT;
2058 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2059 goto err_exit;
2060
2061 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2062
2063 err = -ENODEV;
2064 if (dev == NULL)
2065 goto err_exit;
2066
2067 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2068 if (dev->type == ARPHRD_SIT) {
2069 const struct net_device_ops *ops = dev->netdev_ops;
2070 struct ifreq ifr;
2071 struct ip_tunnel_parm p;
2072
2073 err = -EADDRNOTAVAIL;
2074 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2075 goto err_exit;
2076
2077 memset(&p, 0, sizeof(p));
2078 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2079 p.iph.saddr = 0;
2080 p.iph.version = 4;
2081 p.iph.ihl = 5;
2082 p.iph.protocol = IPPROTO_IPV6;
2083 p.iph.ttl = 64;
2084 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2085
2086 if (ops->ndo_do_ioctl) {
2087 mm_segment_t oldfs = get_fs();
2088
2089 set_fs(KERNEL_DS);
2090 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2091 set_fs(oldfs);
2092 } else
2093 err = -EOPNOTSUPP;
2094
2095 if (err == 0) {
2096 err = -ENOBUFS;
2097 dev = __dev_get_by_name(net, p.name);
2098 if (!dev)
2099 goto err_exit;
2100 err = dev_open(dev);
2101 }
2102 }
2103 #endif
2104
2105 err_exit:
2106 rtnl_unlock();
2107 return err;
2108 }
2109
2110 /*
2111 * Manual configuration of address on an interface
2112 */
2113 static int inet6_addr_add(struct net *net, int ifindex, const struct in6_addr *pfx,
2114 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
2115 __u32 valid_lft)
2116 {
2117 struct inet6_ifaddr *ifp;
2118 struct inet6_dev *idev;
2119 struct net_device *dev;
2120 int scope;
2121 u32 flags;
2122 clock_t expires;
2123 unsigned long timeout;
2124
2125 ASSERT_RTNL();
2126
2127 if (plen > 128)
2128 return -EINVAL;
2129
2130 /* check the lifetime */
2131 if (!valid_lft || prefered_lft > valid_lft)
2132 return -EINVAL;
2133
2134 dev = __dev_get_by_index(net, ifindex);
2135 if (!dev)
2136 return -ENODEV;
2137
2138 idev = addrconf_add_dev(dev);
2139 if (IS_ERR(idev))
2140 return PTR_ERR(idev);
2141
2142 scope = ipv6_addr_scope(pfx);
2143
2144 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2145 if (addrconf_finite_timeout(timeout)) {
2146 expires = jiffies_to_clock_t(timeout * HZ);
2147 valid_lft = timeout;
2148 flags = RTF_EXPIRES;
2149 } else {
2150 expires = 0;
2151 flags = 0;
2152 ifa_flags |= IFA_F_PERMANENT;
2153 }
2154
2155 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2156 if (addrconf_finite_timeout(timeout)) {
2157 if (timeout == 0)
2158 ifa_flags |= IFA_F_DEPRECATED;
2159 prefered_lft = timeout;
2160 }
2161
2162 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2163
2164 if (!IS_ERR(ifp)) {
2165 spin_lock_bh(&ifp->lock);
2166 ifp->valid_lft = valid_lft;
2167 ifp->prefered_lft = prefered_lft;
2168 ifp->tstamp = jiffies;
2169 spin_unlock_bh(&ifp->lock);
2170
2171 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2172 expires, flags);
2173 /*
2174 * Note that section 3.1 of RFC 4429 indicates
2175 * that the Optimistic flag should not be set for
2176 * manually configured addresses
2177 */
2178 addrconf_dad_start(ifp, 0);
2179 in6_ifa_put(ifp);
2180 addrconf_verify(0);
2181 return 0;
2182 }
2183
2184 return PTR_ERR(ifp);
2185 }
2186
2187 static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx,
2188 unsigned int plen)
2189 {
2190 struct inet6_ifaddr *ifp;
2191 struct inet6_dev *idev;
2192 struct net_device *dev;
2193
2194 if (plen > 128)
2195 return -EINVAL;
2196
2197 dev = __dev_get_by_index(net, ifindex);
2198 if (!dev)
2199 return -ENODEV;
2200
2201 if ((idev = __in6_dev_get(dev)) == NULL)
2202 return -ENXIO;
2203
2204 read_lock_bh(&idev->lock);
2205 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2206 if (ifp->prefix_len == plen &&
2207 ipv6_addr_equal(pfx, &ifp->addr)) {
2208 in6_ifa_hold(ifp);
2209 read_unlock_bh(&idev->lock);
2210
2211 ipv6_del_addr(ifp);
2212
2213 /* If the last address is deleted administratively,
2214 disable IPv6 on this interface.
2215 */
2216 if (list_empty(&idev->addr_list))
2217 addrconf_ifdown(idev->dev, 1);
2218 return 0;
2219 }
2220 }
2221 read_unlock_bh(&idev->lock);
2222 return -EADDRNOTAVAIL;
2223 }
2224
2225
2226 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2227 {
2228 struct in6_ifreq ireq;
2229 int err;
2230
2231 if (!capable(CAP_NET_ADMIN))
2232 return -EPERM;
2233
2234 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2235 return -EFAULT;
2236
2237 rtnl_lock();
2238 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2239 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2240 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2241 rtnl_unlock();
2242 return err;
2243 }
2244
2245 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2246 {
2247 struct in6_ifreq ireq;
2248 int err;
2249
2250 if (!capable(CAP_NET_ADMIN))
2251 return -EPERM;
2252
2253 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2254 return -EFAULT;
2255
2256 rtnl_lock();
2257 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2258 ireq.ifr6_prefixlen);
2259 rtnl_unlock();
2260 return err;
2261 }
2262
2263 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2264 int plen, int scope)
2265 {
2266 struct inet6_ifaddr *ifp;
2267
2268 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT);
2269 if (!IS_ERR(ifp)) {
2270 spin_lock_bh(&ifp->lock);
2271 ifp->flags &= ~IFA_F_TENTATIVE;
2272 spin_unlock_bh(&ifp->lock);
2273 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2274 in6_ifa_put(ifp);
2275 }
2276 }
2277
2278 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2279 static void sit_add_v4_addrs(struct inet6_dev *idev)
2280 {
2281 struct in6_addr addr;
2282 struct net_device *dev;
2283 struct net *net = dev_net(idev->dev);
2284 int scope;
2285
2286 ASSERT_RTNL();
2287
2288 memset(&addr, 0, sizeof(struct in6_addr));
2289 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2290
2291 if (idev->dev->flags&IFF_POINTOPOINT) {
2292 addr.s6_addr32[0] = htonl(0xfe800000);
2293 scope = IFA_LINK;
2294 } else {
2295 scope = IPV6_ADDR_COMPATv4;
2296 }
2297
2298 if (addr.s6_addr32[3]) {
2299 add_addr(idev, &addr, 128, scope);
2300 return;
2301 }
2302
2303 for_each_netdev(net, dev) {
2304 struct in_device * in_dev = __in_dev_get_rtnl(dev);
2305 if (in_dev && (dev->flags & IFF_UP)) {
2306 struct in_ifaddr * ifa;
2307
2308 int flag = scope;
2309
2310 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2311 int plen;
2312
2313 addr.s6_addr32[3] = ifa->ifa_local;
2314
2315 if (ifa->ifa_scope == RT_SCOPE_LINK)
2316 continue;
2317 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2318 if (idev->dev->flags&IFF_POINTOPOINT)
2319 continue;
2320 flag |= IFA_HOST;
2321 }
2322 if (idev->dev->flags&IFF_POINTOPOINT)
2323 plen = 64;
2324 else
2325 plen = 96;
2326
2327 add_addr(idev, &addr, plen, flag);
2328 }
2329 }
2330 }
2331 }
2332 #endif
2333
2334 static void init_loopback(struct net_device *dev)
2335 {
2336 struct inet6_dev *idev;
2337
2338 /* ::1 */
2339
2340 ASSERT_RTNL();
2341
2342 if ((idev = ipv6_find_idev(dev)) == NULL) {
2343 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2344 return;
2345 }
2346
2347 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2348 }
2349
2350 static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr)
2351 {
2352 struct inet6_ifaddr * ifp;
2353 u32 addr_flags = IFA_F_PERMANENT;
2354
2355 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2356 if (idev->cnf.optimistic_dad &&
2357 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2358 addr_flags |= IFA_F_OPTIMISTIC;
2359 #endif
2360
2361
2362 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2363 if (!IS_ERR(ifp)) {
2364 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2365 addrconf_dad_start(ifp, 0);
2366 in6_ifa_put(ifp);
2367 }
2368 }
2369
2370 static void addrconf_dev_config(struct net_device *dev)
2371 {
2372 struct in6_addr addr;
2373 struct inet6_dev * idev;
2374
2375 ASSERT_RTNL();
2376
2377 if ((dev->type != ARPHRD_ETHER) &&
2378 (dev->type != ARPHRD_FDDI) &&
2379 (dev->type != ARPHRD_IEEE802_TR) &&
2380 (dev->type != ARPHRD_ARCNET) &&
2381 (dev->type != ARPHRD_INFINIBAND)) {
2382 /* Alas, we support only Ethernet autoconfiguration. */
2383 return;
2384 }
2385
2386 idev = addrconf_add_dev(dev);
2387 if (IS_ERR(idev))
2388 return;
2389
2390 memset(&addr, 0, sizeof(struct in6_addr));
2391 addr.s6_addr32[0] = htonl(0xFE800000);
2392
2393 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2394 addrconf_add_linklocal(idev, &addr);
2395 }
2396
2397 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2398 static void addrconf_sit_config(struct net_device *dev)
2399 {
2400 struct inet6_dev *idev;
2401
2402 ASSERT_RTNL();
2403
2404 /*
2405 * Configure the tunnel with one of our IPv4
2406 * addresses... we should configure all of
2407 * our v4 addrs in the tunnel
2408 */
2409
2410 if ((idev = ipv6_find_idev(dev)) == NULL) {
2411 printk(KERN_DEBUG "init sit: add_dev failed\n");
2412 return;
2413 }
2414
2415 if (dev->priv_flags & IFF_ISATAP) {
2416 struct in6_addr addr;
2417
2418 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2419 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2420 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2421 addrconf_add_linklocal(idev, &addr);
2422 return;
2423 }
2424
2425 sit_add_v4_addrs(idev);
2426
2427 if (dev->flags&IFF_POINTOPOINT) {
2428 addrconf_add_mroute(dev);
2429 addrconf_add_lroute(dev);
2430 } else
2431 sit_route_add(dev);
2432 }
2433 #endif
2434
2435 #if defined(CONFIG_NET_IPGRE) || defined(CONFIG_NET_IPGRE_MODULE)
2436 static void addrconf_gre_config(struct net_device *dev)
2437 {
2438 struct inet6_dev *idev;
2439 struct in6_addr addr;
2440
2441 pr_info("ipv6: addrconf_gre_config(%s)\n", dev->name);
2442
2443 ASSERT_RTNL();
2444
2445 if ((idev = ipv6_find_idev(dev)) == NULL) {
2446 printk(KERN_DEBUG "init gre: add_dev failed\n");
2447 return;
2448 }
2449
2450 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2451 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2452
2453 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2454 addrconf_add_linklocal(idev, &addr);
2455 }
2456 #endif
2457
2458 static inline int
2459 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2460 {
2461 struct in6_addr lladdr;
2462
2463 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2464 addrconf_add_linklocal(idev, &lladdr);
2465 return 0;
2466 }
2467 return -1;
2468 }
2469
2470 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2471 {
2472 struct net_device *link_dev;
2473 struct net *net = dev_net(idev->dev);
2474
2475 /* first try to inherit the link-local address from the link device */
2476 if (idev->dev->iflink &&
2477 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
2478 if (!ipv6_inherit_linklocal(idev, link_dev))
2479 return;
2480 }
2481 /* then try to inherit it from any device */
2482 for_each_netdev(net, link_dev) {
2483 if (!ipv6_inherit_linklocal(idev, link_dev))
2484 return;
2485 }
2486 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2487 }
2488
2489 /*
2490 * Autoconfigure tunnel with a link-local address so routing protocols,
2491 * DHCPv6, MLD etc. can be run over the virtual link
2492 */
2493
2494 static void addrconf_ip6_tnl_config(struct net_device *dev)
2495 {
2496 struct inet6_dev *idev;
2497
2498 ASSERT_RTNL();
2499
2500 idev = addrconf_add_dev(dev);
2501 if (IS_ERR(idev)) {
2502 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2503 return;
2504 }
2505 ip6_tnl_add_linklocal(idev);
2506 }
2507
2508 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2509 void * data)
2510 {
2511 struct net_device *dev = (struct net_device *) data;
2512 struct inet6_dev *idev = __in6_dev_get(dev);
2513 int run_pending = 0;
2514 int err;
2515
2516 switch (event) {
2517 case NETDEV_REGISTER:
2518 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2519 idev = ipv6_add_dev(dev);
2520 if (!idev)
2521 return notifier_from_errno(-ENOMEM);
2522 }
2523 break;
2524
2525 case NETDEV_UP:
2526 case NETDEV_CHANGE:
2527 if (dev->flags & IFF_SLAVE)
2528 break;
2529
2530 if (event == NETDEV_UP) {
2531 if (!addrconf_qdisc_ok(dev)) {
2532 /* device is not ready yet. */
2533 printk(KERN_INFO
2534 "ADDRCONF(NETDEV_UP): %s: "
2535 "link is not ready\n",
2536 dev->name);
2537 break;
2538 }
2539
2540 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2541 idev = ipv6_add_dev(dev);
2542
2543 if (idev) {
2544 idev->if_flags |= IF_READY;
2545 run_pending = 1;
2546 }
2547 } else {
2548 if (!addrconf_qdisc_ok(dev)) {
2549 /* device is still not ready. */
2550 break;
2551 }
2552
2553 if (idev) {
2554 if (idev->if_flags & IF_READY)
2555 /* device is already configured. */
2556 break;
2557 idev->if_flags |= IF_READY;
2558 }
2559
2560 printk(KERN_INFO
2561 "ADDRCONF(NETDEV_CHANGE): %s: "
2562 "link becomes ready\n",
2563 dev->name);
2564
2565 run_pending = 1;
2566 }
2567
2568 switch (dev->type) {
2569 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2570 case ARPHRD_SIT:
2571 addrconf_sit_config(dev);
2572 break;
2573 #endif
2574 #if defined(CONFIG_NET_IPGRE) || defined(CONFIG_NET_IPGRE_MODULE)
2575 case ARPHRD_IPGRE:
2576 addrconf_gre_config(dev);
2577 break;
2578 #endif
2579 case ARPHRD_TUNNEL6:
2580 addrconf_ip6_tnl_config(dev);
2581 break;
2582 case ARPHRD_LOOPBACK:
2583 init_loopback(dev);
2584 break;
2585
2586 default:
2587 addrconf_dev_config(dev);
2588 break;
2589 }
2590
2591 if (idev) {
2592 if (run_pending)
2593 addrconf_dad_run(idev);
2594
2595 /*
2596 * If the MTU changed during the interface down,
2597 * when the interface up, the changed MTU must be
2598 * reflected in the idev as well as routers.
2599 */
2600 if (idev->cnf.mtu6 != dev->mtu &&
2601 dev->mtu >= IPV6_MIN_MTU) {
2602 rt6_mtu_change(dev, dev->mtu);
2603 idev->cnf.mtu6 = dev->mtu;
2604 }
2605 idev->tstamp = jiffies;
2606 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2607
2608 /*
2609 * If the changed mtu during down is lower than
2610 * IPV6_MIN_MTU stop IPv6 on this interface.
2611 */
2612 if (dev->mtu < IPV6_MIN_MTU)
2613 addrconf_ifdown(dev, 1);
2614 }
2615 break;
2616
2617 case NETDEV_CHANGEMTU:
2618 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2619 rt6_mtu_change(dev, dev->mtu);
2620 idev->cnf.mtu6 = dev->mtu;
2621 break;
2622 }
2623
2624 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2625 idev = ipv6_add_dev(dev);
2626 if (idev)
2627 break;
2628 }
2629
2630 /*
2631 * MTU falled under IPV6_MIN_MTU.
2632 * Stop IPv6 on this interface.
2633 */
2634
2635 case NETDEV_DOWN:
2636 case NETDEV_UNREGISTER:
2637 /*
2638 * Remove all addresses from this interface.
2639 */
2640 addrconf_ifdown(dev, event != NETDEV_DOWN);
2641 break;
2642
2643 case NETDEV_CHANGENAME:
2644 if (idev) {
2645 snmp6_unregister_dev(idev);
2646 addrconf_sysctl_unregister(idev);
2647 addrconf_sysctl_register(idev);
2648 err = snmp6_register_dev(idev);
2649 if (err)
2650 return notifier_from_errno(err);
2651 }
2652 break;
2653
2654 case NETDEV_PRE_TYPE_CHANGE:
2655 case NETDEV_POST_TYPE_CHANGE:
2656 addrconf_type_change(dev, event);
2657 break;
2658 }
2659
2660 return NOTIFY_OK;
2661 }
2662
2663 /*
2664 * addrconf module should be notified of a device going up
2665 */
2666 static struct notifier_block ipv6_dev_notf = {
2667 .notifier_call = addrconf_notify,
2668 };
2669
2670 static void addrconf_type_change(struct net_device *dev, unsigned long event)
2671 {
2672 struct inet6_dev *idev;
2673 ASSERT_RTNL();
2674
2675 idev = __in6_dev_get(dev);
2676
2677 if (event == NETDEV_POST_TYPE_CHANGE)
2678 ipv6_mc_remap(idev);
2679 else if (event == NETDEV_PRE_TYPE_CHANGE)
2680 ipv6_mc_unmap(idev);
2681 }
2682
2683 static int addrconf_ifdown(struct net_device *dev, int how)
2684 {
2685 struct net *net = dev_net(dev);
2686 struct inet6_dev *idev;
2687 struct inet6_ifaddr *ifa;
2688 int state, i;
2689
2690 ASSERT_RTNL();
2691
2692 rt6_ifdown(net, dev);
2693 neigh_ifdown(&nd_tbl, dev);
2694
2695 idev = __in6_dev_get(dev);
2696 if (idev == NULL)
2697 return -ENODEV;
2698
2699 /*
2700 * Step 1: remove reference to ipv6 device from parent device.
2701 * Do not dev_put!
2702 */
2703 if (how) {
2704 idev->dead = 1;
2705
2706 /* protected by rtnl_lock */
2707 rcu_assign_pointer(dev->ip6_ptr, NULL);
2708
2709 /* Step 1.5: remove snmp6 entry */
2710 snmp6_unregister_dev(idev);
2711
2712 }
2713
2714 /* Step 2: clear hash table */
2715 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
2716 struct hlist_head *h = &inet6_addr_lst[i];
2717 struct hlist_node *n;
2718
2719 spin_lock_bh(&addrconf_hash_lock);
2720 restart:
2721 hlist_for_each_entry_rcu(ifa, n, h, addr_lst) {
2722 if (ifa->idev == idev) {
2723 hlist_del_init_rcu(&ifa->addr_lst);
2724 addrconf_del_timer(ifa);
2725 goto restart;
2726 }
2727 }
2728 spin_unlock_bh(&addrconf_hash_lock);
2729 }
2730
2731 write_lock_bh(&idev->lock);
2732
2733 /* Step 2: clear flags for stateless addrconf */
2734 if (!how)
2735 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2736
2737 #ifdef CONFIG_IPV6_PRIVACY
2738 if (how && del_timer(&idev->regen_timer))
2739 in6_dev_put(idev);
2740
2741 /* Step 3: clear tempaddr list */
2742 while (!list_empty(&idev->tempaddr_list)) {
2743 ifa = list_first_entry(&idev->tempaddr_list,
2744 struct inet6_ifaddr, tmp_list);
2745 list_del(&ifa->tmp_list);
2746 write_unlock_bh(&idev->lock);
2747 spin_lock_bh(&ifa->lock);
2748
2749 if (ifa->ifpub) {
2750 in6_ifa_put(ifa->ifpub);
2751 ifa->ifpub = NULL;
2752 }
2753 spin_unlock_bh(&ifa->lock);
2754 in6_ifa_put(ifa);
2755 write_lock_bh(&idev->lock);
2756 }
2757 #endif
2758
2759 while (!list_empty(&idev->addr_list)) {
2760 ifa = list_first_entry(&idev->addr_list,
2761 struct inet6_ifaddr, if_list);
2762 addrconf_del_timer(ifa);
2763
2764 list_del(&ifa->if_list);
2765
2766 write_unlock_bh(&idev->lock);
2767
2768 spin_lock_bh(&ifa->state_lock);
2769 state = ifa->state;
2770 ifa->state = INET6_IFADDR_STATE_DEAD;
2771 spin_unlock_bh(&ifa->state_lock);
2772
2773 if (state != INET6_IFADDR_STATE_DEAD) {
2774 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2775 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2776 }
2777 in6_ifa_put(ifa);
2778
2779 write_lock_bh(&idev->lock);
2780 }
2781
2782 write_unlock_bh(&idev->lock);
2783
2784 /* Step 5: Discard multicast list */
2785 if (how)
2786 ipv6_mc_destroy_dev(idev);
2787 else
2788 ipv6_mc_down(idev);
2789
2790 idev->tstamp = jiffies;
2791
2792 /* Last: Shot the device (if unregistered) */
2793 if (how) {
2794 addrconf_sysctl_unregister(idev);
2795 neigh_parms_release(&nd_tbl, idev->nd_parms);
2796 neigh_ifdown(&nd_tbl, dev);
2797 in6_dev_put(idev);
2798 }
2799 return 0;
2800 }
2801
2802 static void addrconf_rs_timer(unsigned long data)
2803 {
2804 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2805 struct inet6_dev *idev = ifp->idev;
2806
2807 read_lock(&idev->lock);
2808 if (idev->dead || !(idev->if_flags & IF_READY))
2809 goto out;
2810
2811 if (idev->cnf.forwarding)
2812 goto out;
2813
2814 /* Announcement received after solicitation was sent */
2815 if (idev->if_flags & IF_RA_RCVD)
2816 goto out;
2817
2818 spin_lock(&ifp->lock);
2819 if (ifp->probes++ < idev->cnf.rtr_solicits) {
2820 /* The wait after the last probe can be shorter */
2821 addrconf_mod_timer(ifp, AC_RS,
2822 (ifp->probes == idev->cnf.rtr_solicits) ?
2823 idev->cnf.rtr_solicit_delay :
2824 idev->cnf.rtr_solicit_interval);
2825 spin_unlock(&ifp->lock);
2826
2827 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2828 } else {
2829 spin_unlock(&ifp->lock);
2830 /*
2831 * Note: we do not support deprecated "all on-link"
2832 * assumption any longer.
2833 */
2834 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2835 idev->dev->name);
2836 }
2837
2838 out:
2839 read_unlock(&idev->lock);
2840 in6_ifa_put(ifp);
2841 }
2842
2843 /*
2844 * Duplicate Address Detection
2845 */
2846 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2847 {
2848 unsigned long rand_num;
2849 struct inet6_dev *idev = ifp->idev;
2850
2851 if (ifp->flags & IFA_F_OPTIMISTIC)
2852 rand_num = 0;
2853 else
2854 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2855
2856 ifp->probes = idev->cnf.dad_transmits;
2857 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2858 }
2859
2860 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2861 {
2862 struct inet6_dev *idev = ifp->idev;
2863 struct net_device *dev = idev->dev;
2864
2865 addrconf_join_solict(dev, &ifp->addr);
2866
2867 net_srandom(ifp->addr.s6_addr32[3]);
2868
2869 read_lock_bh(&idev->lock);
2870 spin_lock(&ifp->lock);
2871 if (ifp->state == INET6_IFADDR_STATE_DEAD)
2872 goto out;
2873
2874 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2875 idev->cnf.accept_dad < 1 ||
2876 !(ifp->flags&IFA_F_TENTATIVE) ||
2877 ifp->flags & IFA_F_NODAD) {
2878 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
2879 spin_unlock(&ifp->lock);
2880 read_unlock_bh(&idev->lock);
2881
2882 addrconf_dad_completed(ifp);
2883 return;
2884 }
2885
2886 if (!(idev->if_flags & IF_READY)) {
2887 spin_unlock(&ifp->lock);
2888 read_unlock_bh(&idev->lock);
2889 /*
2890 * If the device is not ready:
2891 * - keep it tentative if it is a permanent address.
2892 * - otherwise, kill it.
2893 */
2894 in6_ifa_hold(ifp);
2895 addrconf_dad_stop(ifp, 0);
2896 return;
2897 }
2898
2899 /*
2900 * Optimistic nodes can start receiving
2901 * Frames right away
2902 */
2903 if (ifp->flags & IFA_F_OPTIMISTIC)
2904 ip6_ins_rt(ifp->rt);
2905
2906 addrconf_dad_kick(ifp);
2907 out:
2908 spin_unlock(&ifp->lock);
2909 read_unlock_bh(&idev->lock);
2910 }
2911
2912 static void addrconf_dad_timer(unsigned long data)
2913 {
2914 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2915 struct inet6_dev *idev = ifp->idev;
2916 struct in6_addr mcaddr;
2917
2918 if (!ifp->probes && addrconf_dad_end(ifp))
2919 goto out;
2920
2921 read_lock(&idev->lock);
2922 if (idev->dead || !(idev->if_flags & IF_READY)) {
2923 read_unlock(&idev->lock);
2924 goto out;
2925 }
2926
2927 spin_lock(&ifp->lock);
2928 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
2929 spin_unlock(&ifp->lock);
2930 read_unlock(&idev->lock);
2931 goto out;
2932 }
2933
2934 if (ifp->probes == 0) {
2935 /*
2936 * DAD was successful
2937 */
2938
2939 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
2940 spin_unlock(&ifp->lock);
2941 read_unlock(&idev->lock);
2942
2943 addrconf_dad_completed(ifp);
2944
2945 goto out;
2946 }
2947
2948 ifp->probes--;
2949 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2950 spin_unlock(&ifp->lock);
2951 read_unlock(&idev->lock);
2952
2953 /* send a neighbour solicitation for our addr */
2954 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2955 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
2956 out:
2957 in6_ifa_put(ifp);
2958 }
2959
2960 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2961 {
2962 struct net_device *dev = ifp->idev->dev;
2963
2964 /*
2965 * Configure the address for reception. Now it is valid.
2966 */
2967
2968 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2969
2970 /* If added prefix is link local and forwarding is off,
2971 start sending router solicitations.
2972 */
2973
2974 if ((ifp->idev->cnf.forwarding == 0 ||
2975 ifp->idev->cnf.forwarding == 2) &&
2976 ifp->idev->cnf.rtr_solicits > 0 &&
2977 (dev->flags&IFF_LOOPBACK) == 0 &&
2978 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2979 /*
2980 * If a host as already performed a random delay
2981 * [...] as part of DAD [...] there is no need
2982 * to delay again before sending the first RS
2983 */
2984 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2985
2986 spin_lock_bh(&ifp->lock);
2987 ifp->probes = 1;
2988 ifp->idev->if_flags |= IF_RS_SENT;
2989 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2990 spin_unlock_bh(&ifp->lock);
2991 }
2992 }
2993
2994 static void addrconf_dad_run(struct inet6_dev *idev)
2995 {
2996 struct inet6_ifaddr *ifp;
2997
2998 read_lock_bh(&idev->lock);
2999 list_for_each_entry(ifp, &idev->addr_list, if_list) {
3000 spin_lock(&ifp->lock);
3001 if (ifp->flags & IFA_F_TENTATIVE &&
3002 ifp->state == INET6_IFADDR_STATE_DAD)
3003 addrconf_dad_kick(ifp);
3004 spin_unlock(&ifp->lock);
3005 }
3006 read_unlock_bh(&idev->lock);
3007 }
3008
3009 #ifdef CONFIG_PROC_FS
3010 struct if6_iter_state {
3011 struct seq_net_private p;
3012 int bucket;
3013 };
3014
3015 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
3016 {
3017 struct inet6_ifaddr *ifa = NULL;
3018 struct if6_iter_state *state = seq->private;
3019 struct net *net = seq_file_net(seq);
3020
3021 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3022 struct hlist_node *n;
3023 hlist_for_each_entry_rcu_bh(ifa, n, &inet6_addr_lst[state->bucket],
3024 addr_lst)
3025 if (net_eq(dev_net(ifa->idev->dev), net))
3026 return ifa;
3027 }
3028 return NULL;
3029 }
3030
3031 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3032 struct inet6_ifaddr *ifa)
3033 {
3034 struct if6_iter_state *state = seq->private;
3035 struct net *net = seq_file_net(seq);
3036 struct hlist_node *n = &ifa->addr_lst;
3037
3038 hlist_for_each_entry_continue_rcu_bh(ifa, n, addr_lst)
3039 if (net_eq(dev_net(ifa->idev->dev), net))
3040 return ifa;
3041
3042 while (++state->bucket < IN6_ADDR_HSIZE) {
3043 hlist_for_each_entry_rcu_bh(ifa, n,
3044 &inet6_addr_lst[state->bucket], addr_lst) {
3045 if (net_eq(dev_net(ifa->idev->dev), net))
3046 return ifa;
3047 }
3048 }
3049
3050 return NULL;
3051 }
3052
3053 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
3054 {
3055 struct inet6_ifaddr *ifa = if6_get_first(seq);
3056
3057 if (ifa)
3058 while (pos && (ifa = if6_get_next(seq, ifa)) != NULL)
3059 --pos;
3060 return pos ? NULL : ifa;
3061 }
3062
3063 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3064 __acquires(rcu_bh)
3065 {
3066 rcu_read_lock_bh();
3067 return if6_get_idx(seq, *pos);
3068 }
3069
3070 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3071 {
3072 struct inet6_ifaddr *ifa;
3073
3074 ifa = if6_get_next(seq, v);
3075 ++*pos;
3076 return ifa;
3077 }
3078
3079 static void if6_seq_stop(struct seq_file *seq, void *v)
3080 __releases(rcu_bh)
3081 {
3082 rcu_read_unlock_bh();
3083 }
3084
3085 static int if6_seq_show(struct seq_file *seq, void *v)
3086 {
3087 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3088 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3089 &ifp->addr,
3090 ifp->idev->dev->ifindex,
3091 ifp->prefix_len,
3092 ifp->scope,
3093 ifp->flags,
3094 ifp->idev->dev->name);
3095 return 0;
3096 }
3097
3098 static const struct seq_operations if6_seq_ops = {
3099 .start = if6_seq_start,
3100 .next = if6_seq_next,
3101 .show = if6_seq_show,
3102 .stop = if6_seq_stop,
3103 };
3104
3105 static int if6_seq_open(struct inode *inode, struct file *file)
3106 {
3107 return seq_open_net(inode, file, &if6_seq_ops,
3108 sizeof(struct if6_iter_state));
3109 }
3110
3111 static const struct file_operations if6_fops = {
3112 .owner = THIS_MODULE,
3113 .open = if6_seq_open,
3114 .read = seq_read,
3115 .llseek = seq_lseek,
3116 .release = seq_release_net,
3117 };
3118
3119 static int __net_init if6_proc_net_init(struct net *net)
3120 {
3121 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
3122 return -ENOMEM;
3123 return 0;
3124 }
3125
3126 static void __net_exit if6_proc_net_exit(struct net *net)
3127 {
3128 proc_net_remove(net, "if_inet6");
3129 }
3130
3131 static struct pernet_operations if6_proc_net_ops = {
3132 .init = if6_proc_net_init,
3133 .exit = if6_proc_net_exit,
3134 };
3135
3136 int __init if6_proc_init(void)
3137 {
3138 return register_pernet_subsys(&if6_proc_net_ops);
3139 }
3140
3141 void if6_proc_exit(void)
3142 {
3143 unregister_pernet_subsys(&if6_proc_net_ops);
3144 }
3145 #endif /* CONFIG_PROC_FS */
3146
3147 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3148 /* Check if address is a home address configured on any interface. */
3149 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3150 {
3151 int ret = 0;
3152 struct inet6_ifaddr *ifp = NULL;
3153 struct hlist_node *n;
3154 unsigned int hash = ipv6_addr_hash(addr);
3155
3156 rcu_read_lock_bh();
3157 hlist_for_each_entry_rcu_bh(ifp, n, &inet6_addr_lst[hash], addr_lst) {
3158 if (!net_eq(dev_net(ifp->idev->dev), net))
3159 continue;
3160 if (ipv6_addr_equal(&ifp->addr, addr) &&
3161 (ifp->flags & IFA_F_HOMEADDRESS)) {
3162 ret = 1;
3163 break;
3164 }
3165 }
3166 rcu_read_unlock_bh();
3167 return ret;
3168 }
3169 #endif
3170
3171 /*
3172 * Periodic address status verification
3173 */
3174
3175 static void addrconf_verify(unsigned long foo)
3176 {
3177 unsigned long now, next, next_sec, next_sched;
3178 struct inet6_ifaddr *ifp;
3179 struct hlist_node *node;
3180 int i;
3181
3182 rcu_read_lock_bh();
3183 spin_lock(&addrconf_verify_lock);
3184 now = jiffies;
3185 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3186
3187 del_timer(&addr_chk_timer);
3188
3189 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3190 restart:
3191 hlist_for_each_entry_rcu_bh(ifp, node,
3192 &inet6_addr_lst[i], addr_lst) {
3193 unsigned long age;
3194
3195 if (ifp->flags & IFA_F_PERMANENT)
3196 continue;
3197
3198 spin_lock(&ifp->lock);
3199 /* We try to batch several events at once. */
3200 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3201
3202 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3203 age >= ifp->valid_lft) {
3204 spin_unlock(&ifp->lock);
3205 in6_ifa_hold(ifp);
3206 ipv6_del_addr(ifp);
3207 goto restart;
3208 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3209 spin_unlock(&ifp->lock);
3210 continue;
3211 } else if (age >= ifp->prefered_lft) {
3212 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3213 int deprecate = 0;
3214
3215 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3216 deprecate = 1;
3217 ifp->flags |= IFA_F_DEPRECATED;
3218 }
3219
3220 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3221 next = ifp->tstamp + ifp->valid_lft * HZ;
3222
3223 spin_unlock(&ifp->lock);
3224
3225 if (deprecate) {
3226 in6_ifa_hold(ifp);
3227
3228 ipv6_ifa_notify(0, ifp);
3229 in6_ifa_put(ifp);
3230 goto restart;
3231 }
3232 #ifdef CONFIG_IPV6_PRIVACY
3233 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3234 !(ifp->flags&IFA_F_TENTATIVE)) {
3235 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3236 ifp->idev->cnf.dad_transmits *
3237 ifp->idev->nd_parms->retrans_time / HZ;
3238
3239 if (age >= ifp->prefered_lft - regen_advance) {
3240 struct inet6_ifaddr *ifpub = ifp->ifpub;
3241 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3242 next = ifp->tstamp + ifp->prefered_lft * HZ;
3243 if (!ifp->regen_count && ifpub) {
3244 ifp->regen_count++;
3245 in6_ifa_hold(ifp);
3246 in6_ifa_hold(ifpub);
3247 spin_unlock(&ifp->lock);
3248
3249 spin_lock(&ifpub->lock);
3250 ifpub->regen_count = 0;
3251 spin_unlock(&ifpub->lock);
3252 ipv6_create_tempaddr(ifpub, ifp);
3253 in6_ifa_put(ifpub);
3254 in6_ifa_put(ifp);
3255 goto restart;
3256 }
3257 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3258 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3259 spin_unlock(&ifp->lock);
3260 #endif
3261 } else {
3262 /* ifp->prefered_lft <= ifp->valid_lft */
3263 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3264 next = ifp->tstamp + ifp->prefered_lft * HZ;
3265 spin_unlock(&ifp->lock);
3266 }
3267 }
3268 }
3269
3270 next_sec = round_jiffies_up(next);
3271 next_sched = next;
3272
3273 /* If rounded timeout is accurate enough, accept it. */
3274 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3275 next_sched = next_sec;
3276
3277 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3278 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3279 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3280
3281 ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3282 now, next, next_sec, next_sched));
3283
3284 addr_chk_timer.expires = next_sched;
3285 add_timer(&addr_chk_timer);
3286 spin_unlock(&addrconf_verify_lock);
3287 rcu_read_unlock_bh();
3288 }
3289
3290 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3291 {
3292 struct in6_addr *pfx = NULL;
3293
3294 if (addr)
3295 pfx = nla_data(addr);
3296
3297 if (local) {
3298 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3299 pfx = NULL;
3300 else
3301 pfx = nla_data(local);
3302 }
3303
3304 return pfx;
3305 }
3306
3307 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3308 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3309 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3310 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3311 };
3312
3313 static int
3314 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3315 {
3316 struct net *net = sock_net(skb->sk);
3317 struct ifaddrmsg *ifm;
3318 struct nlattr *tb[IFA_MAX+1];
3319 struct in6_addr *pfx;
3320 int err;
3321
3322 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3323 if (err < 0)
3324 return err;
3325
3326 ifm = nlmsg_data(nlh);
3327 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3328 if (pfx == NULL)
3329 return -EINVAL;
3330
3331 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3332 }
3333
3334 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3335 u32 prefered_lft, u32 valid_lft)
3336 {
3337 u32 flags;
3338 clock_t expires;
3339 unsigned long timeout;
3340
3341 if (!valid_lft || (prefered_lft > valid_lft))
3342 return -EINVAL;
3343
3344 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3345 if (addrconf_finite_timeout(timeout)) {
3346 expires = jiffies_to_clock_t(timeout * HZ);
3347 valid_lft = timeout;
3348 flags = RTF_EXPIRES;
3349 } else {
3350 expires = 0;
3351 flags = 0;
3352 ifa_flags |= IFA_F_PERMANENT;
3353 }
3354
3355 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3356 if (addrconf_finite_timeout(timeout)) {
3357 if (timeout == 0)
3358 ifa_flags |= IFA_F_DEPRECATED;
3359 prefered_lft = timeout;
3360 }
3361
3362 spin_lock_bh(&ifp->lock);
3363 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3364 ifp->tstamp = jiffies;
3365 ifp->valid_lft = valid_lft;
3366 ifp->prefered_lft = prefered_lft;
3367
3368 spin_unlock_bh(&ifp->lock);
3369 if (!(ifp->flags&IFA_F_TENTATIVE))
3370 ipv6_ifa_notify(0, ifp);
3371
3372 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3373 expires, flags);
3374 addrconf_verify(0);
3375
3376 return 0;
3377 }
3378
3379 static int
3380 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3381 {
3382 struct net *net = sock_net(skb->sk);
3383 struct ifaddrmsg *ifm;
3384 struct nlattr *tb[IFA_MAX+1];
3385 struct in6_addr *pfx;
3386 struct inet6_ifaddr *ifa;
3387 struct net_device *dev;
3388 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3389 u8 ifa_flags;
3390 int err;
3391
3392 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3393 if (err < 0)
3394 return err;
3395
3396 ifm = nlmsg_data(nlh);
3397 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3398 if (pfx == NULL)
3399 return -EINVAL;
3400
3401 if (tb[IFA_CACHEINFO]) {
3402 struct ifa_cacheinfo *ci;
3403
3404 ci = nla_data(tb[IFA_CACHEINFO]);
3405 valid_lft = ci->ifa_valid;
3406 preferred_lft = ci->ifa_prefered;
3407 } else {
3408 preferred_lft = INFINITY_LIFE_TIME;
3409 valid_lft = INFINITY_LIFE_TIME;
3410 }
3411
3412 dev = __dev_get_by_index(net, ifm->ifa_index);
3413 if (dev == NULL)
3414 return -ENODEV;
3415
3416 /* We ignore other flags so far. */
3417 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3418
3419 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3420 if (ifa == NULL) {
3421 /*
3422 * It would be best to check for !NLM_F_CREATE here but
3423 * userspace alreay relies on not having to provide this.
3424 */
3425 return inet6_addr_add(net, ifm->ifa_index, pfx,
3426 ifm->ifa_prefixlen, ifa_flags,
3427 preferred_lft, valid_lft);
3428 }
3429
3430 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3431 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3432 err = -EEXIST;
3433 else
3434 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3435
3436 in6_ifa_put(ifa);
3437
3438 return err;
3439 }
3440
3441 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3442 u8 scope, int ifindex)
3443 {
3444 struct ifaddrmsg *ifm;
3445
3446 ifm = nlmsg_data(nlh);
3447 ifm->ifa_family = AF_INET6;
3448 ifm->ifa_prefixlen = prefixlen;
3449 ifm->ifa_flags = flags;
3450 ifm->ifa_scope = scope;
3451 ifm->ifa_index = ifindex;
3452 }
3453
3454 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3455 unsigned long tstamp, u32 preferred, u32 valid)
3456 {
3457 struct ifa_cacheinfo ci;
3458
3459 ci.cstamp = cstamp_delta(cstamp);
3460 ci.tstamp = cstamp_delta(tstamp);
3461 ci.ifa_prefered = preferred;
3462 ci.ifa_valid = valid;
3463
3464 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3465 }
3466
3467 static inline int rt_scope(int ifa_scope)
3468 {
3469 if (ifa_scope & IFA_HOST)
3470 return RT_SCOPE_HOST;
3471 else if (ifa_scope & IFA_LINK)
3472 return RT_SCOPE_LINK;
3473 else if (ifa_scope & IFA_SITE)
3474 return RT_SCOPE_SITE;
3475 else
3476 return RT_SCOPE_UNIVERSE;
3477 }
3478
3479 static inline int inet6_ifaddr_msgsize(void)
3480 {
3481 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3482 + nla_total_size(16) /* IFA_ADDRESS */
3483 + nla_total_size(sizeof(struct ifa_cacheinfo));
3484 }
3485
3486 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3487 u32 pid, u32 seq, int event, unsigned int flags)
3488 {
3489 struct nlmsghdr *nlh;
3490 u32 preferred, valid;
3491
3492 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3493 if (nlh == NULL)
3494 return -EMSGSIZE;
3495
3496 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3497 ifa->idev->dev->ifindex);
3498
3499 if (!(ifa->flags&IFA_F_PERMANENT)) {
3500 preferred = ifa->prefered_lft;
3501 valid = ifa->valid_lft;
3502 if (preferred != INFINITY_LIFE_TIME) {
3503 long tval = (jiffies - ifa->tstamp)/HZ;
3504 if (preferred > tval)
3505 preferred -= tval;
3506 else
3507 preferred = 0;
3508 if (valid != INFINITY_LIFE_TIME) {
3509 if (valid > tval)
3510 valid -= tval;
3511 else
3512 valid = 0;
3513 }
3514 }
3515 } else {
3516 preferred = INFINITY_LIFE_TIME;
3517 valid = INFINITY_LIFE_TIME;
3518 }
3519
3520 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3521 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3522 nlmsg_cancel(skb, nlh);
3523 return -EMSGSIZE;
3524 }
3525
3526 return nlmsg_end(skb, nlh);
3527 }
3528
3529 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3530 u32 pid, u32 seq, int event, u16 flags)
3531 {
3532 struct nlmsghdr *nlh;
3533 u8 scope = RT_SCOPE_UNIVERSE;
3534 int ifindex = ifmca->idev->dev->ifindex;
3535
3536 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3537 scope = RT_SCOPE_SITE;
3538
3539 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3540 if (nlh == NULL)
3541 return -EMSGSIZE;
3542
3543 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3544 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3545 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3546 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3547 nlmsg_cancel(skb, nlh);
3548 return -EMSGSIZE;
3549 }
3550
3551 return nlmsg_end(skb, nlh);
3552 }
3553
3554 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3555 u32 pid, u32 seq, int event, unsigned int flags)
3556 {
3557 struct nlmsghdr *nlh;
3558 u8 scope = RT_SCOPE_UNIVERSE;
3559 int ifindex = ifaca->aca_idev->dev->ifindex;
3560
3561 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3562 scope = RT_SCOPE_SITE;
3563
3564 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3565 if (nlh == NULL)
3566 return -EMSGSIZE;
3567
3568 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3569 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3570 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3571 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3572 nlmsg_cancel(skb, nlh);
3573 return -EMSGSIZE;
3574 }
3575
3576 return nlmsg_end(skb, nlh);
3577 }
3578
3579 enum addr_type_t {
3580 UNICAST_ADDR,
3581 MULTICAST_ADDR,
3582 ANYCAST_ADDR,
3583 };
3584
3585 /* called with rcu_read_lock() */
3586 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3587 struct netlink_callback *cb, enum addr_type_t type,
3588 int s_ip_idx, int *p_ip_idx)
3589 {
3590 struct ifmcaddr6 *ifmca;
3591 struct ifacaddr6 *ifaca;
3592 int err = 1;
3593 int ip_idx = *p_ip_idx;
3594
3595 read_lock_bh(&idev->lock);
3596 switch (type) {
3597 case UNICAST_ADDR: {
3598 struct inet6_ifaddr *ifa;
3599
3600 /* unicast address incl. temp addr */
3601 list_for_each_entry(ifa, &idev->addr_list, if_list) {
3602 if (++ip_idx < s_ip_idx)
3603 continue;
3604 err = inet6_fill_ifaddr(skb, ifa,
3605 NETLINK_CB(cb->skb).pid,
3606 cb->nlh->nlmsg_seq,
3607 RTM_NEWADDR,
3608 NLM_F_MULTI);
3609 if (err <= 0)
3610 break;
3611 }
3612 break;
3613 }
3614 case MULTICAST_ADDR:
3615 /* multicast address */
3616 for (ifmca = idev->mc_list; ifmca;
3617 ifmca = ifmca->next, ip_idx++) {
3618 if (ip_idx < s_ip_idx)
3619 continue;
3620 err = inet6_fill_ifmcaddr(skb, ifmca,
3621 NETLINK_CB(cb->skb).pid,
3622 cb->nlh->nlmsg_seq,
3623 RTM_GETMULTICAST,
3624 NLM_F_MULTI);
3625 if (err <= 0)
3626 break;
3627 }
3628 break;
3629 case ANYCAST_ADDR:
3630 /* anycast address */
3631 for (ifaca = idev->ac_list; ifaca;
3632 ifaca = ifaca->aca_next, ip_idx++) {
3633 if (ip_idx < s_ip_idx)
3634 continue;
3635 err = inet6_fill_ifacaddr(skb, ifaca,
3636 NETLINK_CB(cb->skb).pid,
3637 cb->nlh->nlmsg_seq,
3638 RTM_GETANYCAST,
3639 NLM_F_MULTI);
3640 if (err <= 0)
3641 break;
3642 }
3643 break;
3644 default:
3645 break;
3646 }
3647 read_unlock_bh(&idev->lock);
3648 *p_ip_idx = ip_idx;
3649 return err;
3650 }
3651
3652 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3653 enum addr_type_t type)
3654 {
3655 struct net *net = sock_net(skb->sk);
3656 int h, s_h;
3657 int idx, ip_idx;
3658 int s_idx, s_ip_idx;
3659 struct net_device *dev;
3660 struct inet6_dev *idev;
3661 struct hlist_head *head;
3662 struct hlist_node *node;
3663
3664 s_h = cb->args[0];
3665 s_idx = idx = cb->args[1];
3666 s_ip_idx = ip_idx = cb->args[2];
3667
3668 rcu_read_lock();
3669 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3670 idx = 0;
3671 head = &net->dev_index_head[h];
3672 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3673 if (idx < s_idx)
3674 goto cont;
3675 if (h > s_h || idx > s_idx)
3676 s_ip_idx = 0;
3677 ip_idx = 0;
3678 idev = __in6_dev_get(dev);
3679 if (!idev)
3680 goto cont;
3681
3682 if (in6_dump_addrs(idev, skb, cb, type,
3683 s_ip_idx, &ip_idx) <= 0)
3684 goto done;
3685 cont:
3686 idx++;
3687 }
3688 }
3689 done:
3690 rcu_read_unlock();
3691 cb->args[0] = h;
3692 cb->args[1] = idx;
3693 cb->args[2] = ip_idx;
3694
3695 return skb->len;
3696 }
3697
3698 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3699 {
3700 enum addr_type_t type = UNICAST_ADDR;
3701
3702 return inet6_dump_addr(skb, cb, type);
3703 }
3704
3705 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3706 {
3707 enum addr_type_t type = MULTICAST_ADDR;
3708
3709 return inet6_dump_addr(skb, cb, type);
3710 }
3711
3712
3713 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3714 {
3715 enum addr_type_t type = ANYCAST_ADDR;
3716
3717 return inet6_dump_addr(skb, cb, type);
3718 }
3719
3720 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3721 void *arg)
3722 {
3723 struct net *net = sock_net(in_skb->sk);
3724 struct ifaddrmsg *ifm;
3725 struct nlattr *tb[IFA_MAX+1];
3726 struct in6_addr *addr = NULL;
3727 struct net_device *dev = NULL;
3728 struct inet6_ifaddr *ifa;
3729 struct sk_buff *skb;
3730 int err;
3731
3732 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3733 if (err < 0)
3734 goto errout;
3735
3736 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3737 if (addr == NULL) {
3738 err = -EINVAL;
3739 goto errout;
3740 }
3741
3742 ifm = nlmsg_data(nlh);
3743 if (ifm->ifa_index)
3744 dev = __dev_get_by_index(net, ifm->ifa_index);
3745
3746 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
3747 if (!ifa) {
3748 err = -EADDRNOTAVAIL;
3749 goto errout;
3750 }
3751
3752 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
3753 if (!skb) {
3754 err = -ENOBUFS;
3755 goto errout_ifa;
3756 }
3757
3758 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3759 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3760 if (err < 0) {
3761 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3762 WARN_ON(err == -EMSGSIZE);
3763 kfree_skb(skb);
3764 goto errout_ifa;
3765 }
3766 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
3767 errout_ifa:
3768 in6_ifa_put(ifa);
3769 errout:
3770 return err;
3771 }
3772
3773 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3774 {
3775 struct sk_buff *skb;
3776 struct net *net = dev_net(ifa->idev->dev);
3777 int err = -ENOBUFS;
3778
3779 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3780 if (skb == NULL)
3781 goto errout;
3782
3783 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3784 if (err < 0) {
3785 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3786 WARN_ON(err == -EMSGSIZE);
3787 kfree_skb(skb);
3788 goto errout;
3789 }
3790 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3791 return;
3792 errout:
3793 if (err < 0)
3794 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3795 }
3796
3797 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3798 __s32 *array, int bytes)
3799 {
3800 BUG_ON(bytes < (DEVCONF_MAX * 4));
3801
3802 memset(array, 0, bytes);
3803 array[DEVCONF_FORWARDING] = cnf->forwarding;
3804 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3805 array[DEVCONF_MTU6] = cnf->mtu6;
3806 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3807 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3808 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3809 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3810 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3811 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
3812 jiffies_to_msecs(cnf->rtr_solicit_interval);
3813 array[DEVCONF_RTR_SOLICIT_DELAY] =
3814 jiffies_to_msecs(cnf->rtr_solicit_delay);
3815 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3816 #ifdef CONFIG_IPV6_PRIVACY
3817 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3818 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3819 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3820 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3821 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3822 #endif
3823 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3824 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3825 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3826 #ifdef CONFIG_IPV6_ROUTER_PREF
3827 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3828 array[DEVCONF_RTR_PROBE_INTERVAL] =
3829 jiffies_to_msecs(cnf->rtr_probe_interval);
3830 #ifdef CONFIG_IPV6_ROUTE_INFO
3831 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3832 #endif
3833 #endif
3834 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3835 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3836 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3837 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3838 #endif
3839 #ifdef CONFIG_IPV6_MROUTE
3840 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
3841 #endif
3842 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
3843 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
3844 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
3845 }
3846
3847 static inline size_t inet6_ifla6_size(void)
3848 {
3849 return nla_total_size(4) /* IFLA_INET6_FLAGS */
3850 + nla_total_size(sizeof(struct ifla_cacheinfo))
3851 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3852 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3853 + nla_total_size(ICMP6_MIB_MAX * 8); /* IFLA_INET6_ICMP6STATS */
3854 }
3855
3856 static inline size_t inet6_if_nlmsg_size(void)
3857 {
3858 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3859 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3860 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3861 + nla_total_size(4) /* IFLA_MTU */
3862 + nla_total_size(4) /* IFLA_LINK */
3863 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
3864 }
3865
3866 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
3867 int items, int bytes)
3868 {
3869 int i;
3870 int pad = bytes - sizeof(u64) * items;
3871 BUG_ON(pad < 0);
3872
3873 /* Use put_unaligned() because stats may not be aligned for u64. */
3874 put_unaligned(items, &stats[0]);
3875 for (i = 1; i < items; i++)
3876 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
3877
3878 memset(&stats[items], 0, pad);
3879 }
3880
3881 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib,
3882 int items, int bytes, size_t syncpoff)
3883 {
3884 int i;
3885 int pad = bytes - sizeof(u64) * items;
3886 BUG_ON(pad < 0);
3887
3888 /* Use put_unaligned() because stats may not be aligned for u64. */
3889 put_unaligned(items, &stats[0]);
3890 for (i = 1; i < items; i++)
3891 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
3892
3893 memset(&stats[items], 0, pad);
3894 }
3895
3896 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3897 int bytes)
3898 {
3899 switch (attrtype) {
3900 case IFLA_INET6_STATS:
3901 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6,
3902 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
3903 break;
3904 case IFLA_INET6_ICMP6STATS:
3905 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
3906 break;
3907 }
3908 }
3909
3910 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
3911 {
3912 struct nlattr *nla;
3913 struct ifla_cacheinfo ci;
3914
3915 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
3916
3917 ci.max_reasm_len = IPV6_MAXPLEN;
3918 ci.tstamp = cstamp_delta(idev->tstamp);
3919 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
3920 ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time);
3921 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3922
3923 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3924 if (nla == NULL)
3925 goto nla_put_failure;
3926 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
3927
3928 /* XXX - MC not implemented */
3929
3930 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3931 if (nla == NULL)
3932 goto nla_put_failure;
3933 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3934
3935 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3936 if (nla == NULL)
3937 goto nla_put_failure;
3938 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
3939
3940 return 0;
3941
3942 nla_put_failure:
3943 return -EMSGSIZE;
3944 }
3945
3946 static size_t inet6_get_link_af_size(const struct net_device *dev)
3947 {
3948 if (!__in6_dev_get(dev))
3949 return 0;
3950
3951 return inet6_ifla6_size();
3952 }
3953
3954 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
3955 {
3956 struct inet6_dev *idev = __in6_dev_get(dev);
3957
3958 if (!idev)
3959 return -ENODATA;
3960
3961 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
3962 return -EMSGSIZE;
3963
3964 return 0;
3965 }
3966
3967 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3968 u32 pid, u32 seq, int event, unsigned int flags)
3969 {
3970 struct net_device *dev = idev->dev;
3971 struct ifinfomsg *hdr;
3972 struct nlmsghdr *nlh;
3973 void *protoinfo;
3974
3975 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3976 if (nlh == NULL)
3977 return -EMSGSIZE;
3978
3979 hdr = nlmsg_data(nlh);
3980 hdr->ifi_family = AF_INET6;
3981 hdr->__ifi_pad = 0;
3982 hdr->ifi_type = dev->type;
3983 hdr->ifi_index = dev->ifindex;
3984 hdr->ifi_flags = dev_get_flags(dev);
3985 hdr->ifi_change = 0;
3986
3987 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
3988
3989 if (dev->addr_len)
3990 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3991
3992 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
3993 if (dev->ifindex != dev->iflink)
3994 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
3995
3996 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3997 if (protoinfo == NULL)
3998 goto nla_put_failure;
3999
4000 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4001 goto nla_put_failure;
4002
4003 nla_nest_end(skb, protoinfo);
4004 return nlmsg_end(skb, nlh);
4005
4006 nla_put_failure:
4007 nlmsg_cancel(skb, nlh);
4008 return -EMSGSIZE;
4009 }
4010
4011 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4012 {
4013 struct net *net = sock_net(skb->sk);
4014 int h, s_h;
4015 int idx = 0, s_idx;
4016 struct net_device *dev;
4017 struct inet6_dev *idev;
4018 struct hlist_head *head;
4019 struct hlist_node *node;
4020
4021 s_h = cb->args[0];
4022 s_idx = cb->args[1];
4023
4024 rcu_read_lock();
4025 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4026 idx = 0;
4027 head = &net->dev_index_head[h];
4028 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
4029 if (idx < s_idx)
4030 goto cont;
4031 idev = __in6_dev_get(dev);
4032 if (!idev)
4033 goto cont;
4034 if (inet6_fill_ifinfo(skb, idev,
4035 NETLINK_CB(cb->skb).pid,
4036 cb->nlh->nlmsg_seq,
4037 RTM_NEWLINK, NLM_F_MULTI) <= 0)
4038 goto out;
4039 cont:
4040 idx++;
4041 }
4042 }
4043 out:
4044 rcu_read_unlock();
4045 cb->args[1] = idx;
4046 cb->args[0] = h;
4047
4048 return skb->len;
4049 }
4050
4051 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4052 {
4053 struct sk_buff *skb;
4054 struct net *net = dev_net(idev->dev);
4055 int err = -ENOBUFS;
4056
4057 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
4058 if (skb == NULL)
4059 goto errout;
4060
4061 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
4062 if (err < 0) {
4063 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4064 WARN_ON(err == -EMSGSIZE);
4065 kfree_skb(skb);
4066 goto errout;
4067 }
4068 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
4069 return;
4070 errout:
4071 if (err < 0)
4072 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
4073 }
4074
4075 static inline size_t inet6_prefix_nlmsg_size(void)
4076 {
4077 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4078 + nla_total_size(sizeof(struct in6_addr))
4079 + nla_total_size(sizeof(struct prefix_cacheinfo));
4080 }
4081
4082 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
4083 struct prefix_info *pinfo, u32 pid, u32 seq,
4084 int event, unsigned int flags)
4085 {
4086 struct prefixmsg *pmsg;
4087 struct nlmsghdr *nlh;
4088 struct prefix_cacheinfo ci;
4089
4090 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
4091 if (nlh == NULL)
4092 return -EMSGSIZE;
4093
4094 pmsg = nlmsg_data(nlh);
4095 pmsg->prefix_family = AF_INET6;
4096 pmsg->prefix_pad1 = 0;
4097 pmsg->prefix_pad2 = 0;
4098 pmsg->prefix_ifindex = idev->dev->ifindex;
4099 pmsg->prefix_len = pinfo->prefix_len;
4100 pmsg->prefix_type = pinfo->type;
4101 pmsg->prefix_pad3 = 0;
4102 pmsg->prefix_flags = 0;
4103 if (pinfo->onlink)
4104 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4105 if (pinfo->autoconf)
4106 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4107
4108 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
4109
4110 ci.preferred_time = ntohl(pinfo->prefered);
4111 ci.valid_time = ntohl(pinfo->valid);
4112 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
4113
4114 return nlmsg_end(skb, nlh);
4115
4116 nla_put_failure:
4117 nlmsg_cancel(skb, nlh);
4118 return -EMSGSIZE;
4119 }
4120
4121 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
4122 struct prefix_info *pinfo)
4123 {
4124 struct sk_buff *skb;
4125 struct net *net = dev_net(idev->dev);
4126 int err = -ENOBUFS;
4127
4128 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
4129 if (skb == NULL)
4130 goto errout;
4131
4132 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
4133 if (err < 0) {
4134 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4135 WARN_ON(err == -EMSGSIZE);
4136 kfree_skb(skb);
4137 goto errout;
4138 }
4139 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4140 return;
4141 errout:
4142 if (err < 0)
4143 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
4144 }
4145
4146 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4147 {
4148 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4149
4150 switch (event) {
4151 case RTM_NEWADDR:
4152 /*
4153 * If the address was optimistic
4154 * we inserted the route at the start of
4155 * our DAD process, so we don't need
4156 * to do it again
4157 */
4158 if (!(ifp->rt->rt6i_node))
4159 ip6_ins_rt(ifp->rt);
4160 if (ifp->idev->cnf.forwarding)
4161 addrconf_join_anycast(ifp);
4162 break;
4163 case RTM_DELADDR:
4164 if (ifp->idev->cnf.forwarding)
4165 addrconf_leave_anycast(ifp);
4166 addrconf_leave_solict(ifp->idev, &ifp->addr);
4167 dst_hold(&ifp->rt->dst);
4168
4169 if (ip6_del_rt(ifp->rt))
4170 dst_free(&ifp->rt->dst);
4171 break;
4172 }
4173 }
4174
4175 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4176 {
4177 rcu_read_lock_bh();
4178 if (likely(ifp->idev->dead == 0))
4179 __ipv6_ifa_notify(event, ifp);
4180 rcu_read_unlock_bh();
4181 }
4182
4183 #ifdef CONFIG_SYSCTL
4184
4185 static
4186 int addrconf_sysctl_forward(ctl_table *ctl, int write,
4187 void __user *buffer, size_t *lenp, loff_t *ppos)
4188 {
4189 int *valp = ctl->data;
4190 int val = *valp;
4191 loff_t pos = *ppos;
4192 int ret;
4193
4194 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
4195
4196 if (write)
4197 ret = addrconf_fixup_forwarding(ctl, valp, val);
4198 if (ret)
4199 *ppos = pos;
4200 return ret;
4201 }
4202
4203 static void dev_disable_change(struct inet6_dev *idev)
4204 {
4205 if (!idev || !idev->dev)
4206 return;
4207
4208 if (idev->cnf.disable_ipv6)
4209 addrconf_notify(NULL, NETDEV_DOWN, idev->dev);
4210 else
4211 addrconf_notify(NULL, NETDEV_UP, idev->dev);
4212 }
4213
4214 static void addrconf_disable_change(struct net *net, __s32 newf)
4215 {
4216 struct net_device *dev;
4217 struct inet6_dev *idev;
4218
4219 rcu_read_lock();
4220 for_each_netdev_rcu(net, dev) {
4221 idev = __in6_dev_get(dev);
4222 if (idev) {
4223 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4224 idev->cnf.disable_ipv6 = newf;
4225 if (changed)
4226 dev_disable_change(idev);
4227 }
4228 }
4229 rcu_read_unlock();
4230 }
4231
4232 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int old)
4233 {
4234 struct net *net;
4235
4236 net = (struct net *)table->extra2;
4237
4238 if (p == &net->ipv6.devconf_dflt->disable_ipv6)
4239 return 0;
4240
4241 if (!rtnl_trylock()) {
4242 /* Restore the original values before restarting */
4243 *p = old;
4244 return restart_syscall();
4245 }
4246
4247 if (p == &net->ipv6.devconf_all->disable_ipv6) {
4248 __s32 newf = net->ipv6.devconf_all->disable_ipv6;
4249 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4250 addrconf_disable_change(net, newf);
4251 } else if ((!*p) ^ (!old))
4252 dev_disable_change((struct inet6_dev *)table->extra1);
4253
4254 rtnl_unlock();
4255 return 0;
4256 }
4257
4258 static
4259 int addrconf_sysctl_disable(ctl_table *ctl, int write,
4260 void __user *buffer, size_t *lenp, loff_t *ppos)
4261 {
4262 int *valp = ctl->data;
4263 int val = *valp;
4264 loff_t pos = *ppos;
4265 int ret;
4266
4267 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
4268
4269 if (write)
4270 ret = addrconf_disable_ipv6(ctl, valp, val);
4271 if (ret)
4272 *ppos = pos;
4273 return ret;
4274 }
4275
4276 static struct addrconf_sysctl_table
4277 {
4278 struct ctl_table_header *sysctl_header;
4279 ctl_table addrconf_vars[DEVCONF_MAX+1];
4280 char *dev_name;
4281 } addrconf_sysctl __read_mostly = {
4282 .sysctl_header = NULL,
4283 .addrconf_vars = {
4284 {
4285 .procname = "forwarding",
4286 .data = &ipv6_devconf.forwarding,
4287 .maxlen = sizeof(int),
4288 .mode = 0644,
4289 .proc_handler = addrconf_sysctl_forward,
4290 },
4291 {
4292 .procname = "hop_limit",
4293 .data = &ipv6_devconf.hop_limit,
4294 .maxlen = sizeof(int),
4295 .mode = 0644,
4296 .proc_handler = proc_dointvec,
4297 },
4298 {
4299 .procname = "mtu",
4300 .data = &ipv6_devconf.mtu6,
4301 .maxlen = sizeof(int),
4302 .mode = 0644,
4303 .proc_handler = proc_dointvec,
4304 },
4305 {
4306 .procname = "accept_ra",
4307 .data = &ipv6_devconf.accept_ra,
4308 .maxlen = sizeof(int),
4309 .mode = 0644,
4310 .proc_handler = proc_dointvec,
4311 },
4312 {
4313 .procname = "accept_redirects",
4314 .data = &ipv6_devconf.accept_redirects,
4315 .maxlen = sizeof(int),
4316 .mode = 0644,
4317 .proc_handler = proc_dointvec,
4318 },
4319 {
4320 .procname = "autoconf",
4321 .data = &ipv6_devconf.autoconf,
4322 .maxlen = sizeof(int),
4323 .mode = 0644,
4324 .proc_handler = proc_dointvec,
4325 },
4326 {
4327 .procname = "dad_transmits",
4328 .data = &ipv6_devconf.dad_transmits,
4329 .maxlen = sizeof(int),
4330 .mode = 0644,
4331 .proc_handler = proc_dointvec,
4332 },
4333 {
4334 .procname = "router_solicitations",
4335 .data = &ipv6_devconf.rtr_solicits,
4336 .maxlen = sizeof(int),
4337 .mode = 0644,
4338 .proc_handler = proc_dointvec,
4339 },
4340 {
4341 .procname = "router_solicitation_interval",
4342 .data = &ipv6_devconf.rtr_solicit_interval,
4343 .maxlen = sizeof(int),
4344 .mode = 0644,
4345 .proc_handler = proc_dointvec_jiffies,
4346 },
4347 {
4348 .procname = "router_solicitation_delay",
4349 .data = &ipv6_devconf.rtr_solicit_delay,
4350 .maxlen = sizeof(int),
4351 .mode = 0644,
4352 .proc_handler = proc_dointvec_jiffies,
4353 },
4354 {
4355 .procname = "force_mld_version",
4356 .data = &ipv6_devconf.force_mld_version,
4357 .maxlen = sizeof(int),
4358 .mode = 0644,
4359 .proc_handler = proc_dointvec,
4360 },
4361 #ifdef CONFIG_IPV6_PRIVACY
4362 {
4363 .procname = "use_tempaddr",
4364 .data = &ipv6_devconf.use_tempaddr,
4365 .maxlen = sizeof(int),
4366 .mode = 0644,
4367 .proc_handler = proc_dointvec,
4368 },
4369 {
4370 .procname = "temp_valid_lft",
4371 .data = &ipv6_devconf.temp_valid_lft,
4372 .maxlen = sizeof(int),
4373 .mode = 0644,
4374 .proc_handler = proc_dointvec,
4375 },
4376 {
4377 .procname = "temp_prefered_lft",
4378 .data = &ipv6_devconf.temp_prefered_lft,
4379 .maxlen = sizeof(int),
4380 .mode = 0644,
4381 .proc_handler = proc_dointvec,
4382 },
4383 {
4384 .procname = "regen_max_retry",
4385 .data = &ipv6_devconf.regen_max_retry,
4386 .maxlen = sizeof(int),
4387 .mode = 0644,
4388 .proc_handler = proc_dointvec,
4389 },
4390 {
4391 .procname = "max_desync_factor",
4392 .data = &ipv6_devconf.max_desync_factor,
4393 .maxlen = sizeof(int),
4394 .mode = 0644,
4395 .proc_handler = proc_dointvec,
4396 },
4397 #endif
4398 {
4399 .procname = "max_addresses",
4400 .data = &ipv6_devconf.max_addresses,
4401 .maxlen = sizeof(int),
4402 .mode = 0644,
4403 .proc_handler = proc_dointvec,
4404 },
4405 {
4406 .procname = "accept_ra_defrtr",
4407 .data = &ipv6_devconf.accept_ra_defrtr,
4408 .maxlen = sizeof(int),
4409 .mode = 0644,
4410 .proc_handler = proc_dointvec,
4411 },
4412 {
4413 .procname = "accept_ra_pinfo",
4414 .data = &ipv6_devconf.accept_ra_pinfo,
4415 .maxlen = sizeof(int),
4416 .mode = 0644,
4417 .proc_handler = proc_dointvec,
4418 },
4419 #ifdef CONFIG_IPV6_ROUTER_PREF
4420 {
4421 .procname = "accept_ra_rtr_pref",
4422 .data = &ipv6_devconf.accept_ra_rtr_pref,
4423 .maxlen = sizeof(int),
4424 .mode = 0644,
4425 .proc_handler = proc_dointvec,
4426 },
4427 {
4428 .procname = "router_probe_interval",
4429 .data = &ipv6_devconf.rtr_probe_interval,
4430 .maxlen = sizeof(int),
4431 .mode = 0644,
4432 .proc_handler = proc_dointvec_jiffies,
4433 },
4434 #ifdef CONFIG_IPV6_ROUTE_INFO
4435 {
4436 .procname = "accept_ra_rt_info_max_plen",
4437 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4438 .maxlen = sizeof(int),
4439 .mode = 0644,
4440 .proc_handler = proc_dointvec,
4441 },
4442 #endif
4443 #endif
4444 {
4445 .procname = "proxy_ndp",
4446 .data = &ipv6_devconf.proxy_ndp,
4447 .maxlen = sizeof(int),
4448 .mode = 0644,
4449 .proc_handler = proc_dointvec,
4450 },
4451 {
4452 .procname = "accept_source_route",
4453 .data = &ipv6_devconf.accept_source_route,
4454 .maxlen = sizeof(int),
4455 .mode = 0644,
4456 .proc_handler = proc_dointvec,
4457 },
4458 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4459 {
4460 .procname = "optimistic_dad",
4461 .data = &ipv6_devconf.optimistic_dad,
4462 .maxlen = sizeof(int),
4463 .mode = 0644,
4464 .proc_handler = proc_dointvec,
4465
4466 },
4467 #endif
4468 #ifdef CONFIG_IPV6_MROUTE
4469 {
4470 .procname = "mc_forwarding",
4471 .data = &ipv6_devconf.mc_forwarding,
4472 .maxlen = sizeof(int),
4473 .mode = 0444,
4474 .proc_handler = proc_dointvec,
4475 },
4476 #endif
4477 {
4478 .procname = "disable_ipv6",
4479 .data = &ipv6_devconf.disable_ipv6,
4480 .maxlen = sizeof(int),
4481 .mode = 0644,
4482 .proc_handler = addrconf_sysctl_disable,
4483 },
4484 {
4485 .procname = "accept_dad",
4486 .data = &ipv6_devconf.accept_dad,
4487 .maxlen = sizeof(int),
4488 .mode = 0644,
4489 .proc_handler = proc_dointvec,
4490 },
4491 {
4492 .procname = "force_tllao",
4493 .data = &ipv6_devconf.force_tllao,
4494 .maxlen = sizeof(int),
4495 .mode = 0644,
4496 .proc_handler = proc_dointvec
4497 },
4498 {
4499 /* sentinel */
4500 }
4501 },
4502 };
4503
4504 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4505 struct inet6_dev *idev, struct ipv6_devconf *p)
4506 {
4507 int i;
4508 struct addrconf_sysctl_table *t;
4509
4510 #define ADDRCONF_CTL_PATH_DEV 3
4511
4512 struct ctl_path addrconf_ctl_path[] = {
4513 { .procname = "net", },
4514 { .procname = "ipv6", },
4515 { .procname = "conf", },
4516 { /* to be set */ },
4517 { },
4518 };
4519
4520
4521 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4522 if (t == NULL)
4523 goto out;
4524
4525 for (i = 0; t->addrconf_vars[i].data; i++) {
4526 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
4527 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4528 t->addrconf_vars[i].extra2 = net;
4529 }
4530
4531 /*
4532 * Make a copy of dev_name, because '.procname' is regarded as const
4533 * by sysctl and we wouldn't want anyone to change it under our feet
4534 * (see SIOCSIFNAME).
4535 */
4536 t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4537 if (!t->dev_name)
4538 goto free;
4539
4540 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
4541
4542 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
4543 t->addrconf_vars);
4544 if (t->sysctl_header == NULL)
4545 goto free_procname;
4546
4547 p->sysctl = t;
4548 return 0;
4549
4550 free_procname:
4551 kfree(t->dev_name);
4552 free:
4553 kfree(t);
4554 out:
4555 return -ENOBUFS;
4556 }
4557
4558 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4559 {
4560 struct addrconf_sysctl_table *t;
4561
4562 if (p->sysctl == NULL)
4563 return;
4564
4565 t = p->sysctl;
4566 p->sysctl = NULL;
4567 unregister_net_sysctl_table(t->sysctl_header);
4568 kfree(t->dev_name);
4569 kfree(t);
4570 }
4571
4572 static void addrconf_sysctl_register(struct inet6_dev *idev)
4573 {
4574 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
4575 &ndisc_ifinfo_sysctl_change);
4576 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
4577 idev, &idev->cnf);
4578 }
4579
4580 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
4581 {
4582 __addrconf_sysctl_unregister(&idev->cnf);
4583 neigh_sysctl_unregister(idev->nd_parms);
4584 }
4585
4586
4587 #endif
4588
4589 static int __net_init addrconf_init_net(struct net *net)
4590 {
4591 int err;
4592 struct ipv6_devconf *all, *dflt;
4593
4594 err = -ENOMEM;
4595 all = &ipv6_devconf;
4596 dflt = &ipv6_devconf_dflt;
4597
4598 if (!net_eq(net, &init_net)) {
4599 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4600 if (all == NULL)
4601 goto err_alloc_all;
4602
4603 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4604 if (dflt == NULL)
4605 goto err_alloc_dflt;
4606 } else {
4607 /* these will be inherited by all namespaces */
4608 dflt->autoconf = ipv6_defaults.autoconf;
4609 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
4610 }
4611
4612 net->ipv6.devconf_all = all;
4613 net->ipv6.devconf_dflt = dflt;
4614
4615 #ifdef CONFIG_SYSCTL
4616 err = __addrconf_sysctl_register(net, "all", NULL, all);
4617 if (err < 0)
4618 goto err_reg_all;
4619
4620 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
4621 if (err < 0)
4622 goto err_reg_dflt;
4623 #endif
4624 return 0;
4625
4626 #ifdef CONFIG_SYSCTL
4627 err_reg_dflt:
4628 __addrconf_sysctl_unregister(all);
4629 err_reg_all:
4630 kfree(dflt);
4631 #endif
4632 err_alloc_dflt:
4633 kfree(all);
4634 err_alloc_all:
4635 return err;
4636 }
4637
4638 static void __net_exit addrconf_exit_net(struct net *net)
4639 {
4640 #ifdef CONFIG_SYSCTL
4641 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4642 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4643 #endif
4644 if (!net_eq(net, &init_net)) {
4645 kfree(net->ipv6.devconf_dflt);
4646 kfree(net->ipv6.devconf_all);
4647 }
4648 }
4649
4650 static struct pernet_operations addrconf_ops = {
4651 .init = addrconf_init_net,
4652 .exit = addrconf_exit_net,
4653 };
4654
4655 /*
4656 * Device notifier
4657 */
4658
4659 int register_inet6addr_notifier(struct notifier_block *nb)
4660 {
4661 return atomic_notifier_chain_register(&inet6addr_chain, nb);
4662 }
4663 EXPORT_SYMBOL(register_inet6addr_notifier);
4664
4665 int unregister_inet6addr_notifier(struct notifier_block *nb)
4666 {
4667 return atomic_notifier_chain_unregister(&inet6addr_chain, nb);
4668 }
4669 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4670
4671 static struct rtnl_af_ops inet6_ops = {
4672 .family = AF_INET6,
4673 .fill_link_af = inet6_fill_link_af,
4674 .get_link_af_size = inet6_get_link_af_size,
4675 };
4676
4677 /*
4678 * Init / cleanup code
4679 */
4680
4681 int __init addrconf_init(void)
4682 {
4683 int i, err;
4684
4685 err = ipv6_addr_label_init();
4686 if (err < 0) {
4687 printk(KERN_CRIT "IPv6 Addrconf:"
4688 " cannot initialize default policy table: %d.\n", err);
4689 goto out;
4690 }
4691
4692 err = register_pernet_subsys(&addrconf_ops);
4693 if (err < 0)
4694 goto out_addrlabel;
4695
4696 /* The addrconf netdev notifier requires that loopback_dev
4697 * has it's ipv6 private information allocated and setup
4698 * before it can bring up and give link-local addresses
4699 * to other devices which are up.
4700 *
4701 * Unfortunately, loopback_dev is not necessarily the first
4702 * entry in the global dev_base list of net devices. In fact,
4703 * it is likely to be the very last entry on that list.
4704 * So this causes the notifier registry below to try and
4705 * give link-local addresses to all devices besides loopback_dev
4706 * first, then loopback_dev, which cases all the non-loopback_dev
4707 * devices to fail to get a link-local address.
4708 *
4709 * So, as a temporary fix, allocate the ipv6 structure for
4710 * loopback_dev first by hand.
4711 * Longer term, all of the dependencies ipv6 has upon the loopback
4712 * device and it being up should be removed.
4713 */
4714 rtnl_lock();
4715 if (!ipv6_add_dev(init_net.loopback_dev))
4716 err = -ENOMEM;
4717 rtnl_unlock();
4718 if (err)
4719 goto errlo;
4720
4721 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4722 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
4723
4724 register_netdevice_notifier(&ipv6_dev_notf);
4725
4726 addrconf_verify(0);
4727
4728 err = rtnl_af_register(&inet6_ops);
4729 if (err < 0)
4730 goto errout_af;
4731
4732 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
4733 NULL);
4734 if (err < 0)
4735 goto errout;
4736
4737 /* Only the first call to __rtnl_register can fail */
4738 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
4739 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
4740 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
4741 inet6_dump_ifaddr, NULL);
4742 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
4743 inet6_dump_ifmcaddr, NULL);
4744 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
4745 inet6_dump_ifacaddr, NULL);
4746
4747 ipv6_addr_label_rtnl_register();
4748
4749 return 0;
4750 errout:
4751 rtnl_af_unregister(&inet6_ops);
4752 errout_af:
4753 unregister_netdevice_notifier(&ipv6_dev_notf);
4754 errlo:
4755 unregister_pernet_subsys(&addrconf_ops);
4756 out_addrlabel:
4757 ipv6_addr_label_cleanup();
4758 out:
4759 return err;
4760 }
4761
4762 void addrconf_cleanup(void)
4763 {
4764 struct net_device *dev;
4765 int i;
4766
4767 unregister_netdevice_notifier(&ipv6_dev_notf);
4768 unregister_pernet_subsys(&addrconf_ops);
4769 ipv6_addr_label_cleanup();
4770
4771 rtnl_lock();
4772
4773 __rtnl_af_unregister(&inet6_ops);
4774
4775 /* clean dev list */
4776 for_each_netdev(&init_net, dev) {
4777 if (__in6_dev_get(dev) == NULL)
4778 continue;
4779 addrconf_ifdown(dev, 1);
4780 }
4781 addrconf_ifdown(init_net.loopback_dev, 2);
4782
4783 /*
4784 * Check hash table.
4785 */
4786 spin_lock_bh(&addrconf_hash_lock);
4787 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4788 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
4789 spin_unlock_bh(&addrconf_hash_lock);
4790
4791 del_timer(&addr_chk_timer);
4792 rtnl_unlock();
4793 }
kernel source for telekom puls (alcatel/mediatek)