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ipv6: generate link local address for GRE tunnel
[deliverable/linux.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 (rt->rt6i_nexthop == NULL)
660 ifa->flags &= ~IFA_F_OPTIMISTIC;
661
662 ifa->idev = idev;
663 in6_dev_hold(idev);
664 /* For caller */
665 in6_ifa_hold(ifa);
666
667 /* Add to big hash table */
668 hash = ipv6_addr_hash(addr);
669
670 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
671 spin_unlock(&addrconf_hash_lock);
672
673 write_lock(&idev->lock);
674 /* Add to inet6_dev unicast addr list. */
675 ipv6_link_dev_addr(idev, ifa);
676
677 #ifdef CONFIG_IPV6_PRIVACY
678 if (ifa->flags&IFA_F_TEMPORARY) {
679 list_add(&ifa->tmp_list, &idev->tempaddr_list);
680 in6_ifa_hold(ifa);
681 }
682 #endif
683
684 in6_ifa_hold(ifa);
685 write_unlock(&idev->lock);
686 out2:
687 rcu_read_unlock_bh();
688
689 if (likely(err == 0))
690 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
691 else {
692 kfree(ifa);
693 ifa = ERR_PTR(err);
694 }
695
696 return ifa;
697 out:
698 spin_unlock(&addrconf_hash_lock);
699 goto out2;
700 }
701
702 /* This function wants to get referenced ifp and releases it before return */
703
704 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
705 {
706 struct inet6_ifaddr *ifa, *ifn;
707 struct inet6_dev *idev = ifp->idev;
708 int state;
709 int deleted = 0, onlink = 0;
710 unsigned long expires = jiffies;
711
712 spin_lock_bh(&ifp->state_lock);
713 state = ifp->state;
714 ifp->state = INET6_IFADDR_STATE_DEAD;
715 spin_unlock_bh(&ifp->state_lock);
716
717 if (state == INET6_IFADDR_STATE_DEAD)
718 goto out;
719
720 spin_lock_bh(&addrconf_hash_lock);
721 hlist_del_init_rcu(&ifp->addr_lst);
722 spin_unlock_bh(&addrconf_hash_lock);
723
724 write_lock_bh(&idev->lock);
725 #ifdef CONFIG_IPV6_PRIVACY
726 if (ifp->flags&IFA_F_TEMPORARY) {
727 list_del(&ifp->tmp_list);
728 if (ifp->ifpub) {
729 in6_ifa_put(ifp->ifpub);
730 ifp->ifpub = NULL;
731 }
732 __in6_ifa_put(ifp);
733 }
734 #endif
735
736 list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) {
737 if (ifa == ifp) {
738 list_del_init(&ifp->if_list);
739 __in6_ifa_put(ifp);
740
741 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
742 break;
743 deleted = 1;
744 continue;
745 } else if (ifp->flags & IFA_F_PERMANENT) {
746 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
747 ifp->prefix_len)) {
748 if (ifa->flags & IFA_F_PERMANENT) {
749 onlink = 1;
750 if (deleted)
751 break;
752 } else {
753 unsigned long lifetime;
754
755 if (!onlink)
756 onlink = -1;
757
758 spin_lock(&ifa->lock);
759
760 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
761 /*
762 * Note: Because this address is
763 * not permanent, lifetime <
764 * LONG_MAX / HZ here.
765 */
766 if (time_before(expires,
767 ifa->tstamp + lifetime * HZ))
768 expires = ifa->tstamp + lifetime * HZ;
769 spin_unlock(&ifa->lock);
770 }
771 }
772 }
773 }
774 write_unlock_bh(&idev->lock);
775
776 addrconf_del_timer(ifp);
777
778 ipv6_ifa_notify(RTM_DELADDR, ifp);
779
780 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
781
782 /*
783 * Purge or update corresponding prefix
784 *
785 * 1) we don't purge prefix here if address was not permanent.
786 * prefix is managed by its own lifetime.
787 * 2) if there're no addresses, delete prefix.
788 * 3) if there're still other permanent address(es),
789 * corresponding prefix is still permanent.
790 * 4) otherwise, update prefix lifetime to the
791 * longest valid lifetime among the corresponding
792 * addresses on the device.
793 * Note: subsequent RA will update lifetime.
794 *
795 * --yoshfuji
796 */
797 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
798 struct in6_addr prefix;
799 struct rt6_info *rt;
800 struct net *net = dev_net(ifp->idev->dev);
801 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
802 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1);
803
804 if (rt && addrconf_is_prefix_route(rt)) {
805 if (onlink == 0) {
806 ip6_del_rt(rt);
807 rt = NULL;
808 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
809 rt->rt6i_expires = expires;
810 rt->rt6i_flags |= RTF_EXPIRES;
811 }
812 }
813 dst_release(&rt->dst);
814 }
815
816 /* clean up prefsrc entries */
817 rt6_remove_prefsrc(ifp);
818 out:
819 in6_ifa_put(ifp);
820 }
821
822 #ifdef CONFIG_IPV6_PRIVACY
823 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
824 {
825 struct inet6_dev *idev = ifp->idev;
826 struct in6_addr addr, *tmpaddr;
827 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp, age;
828 unsigned long regen_advance;
829 int tmp_plen;
830 int ret = 0;
831 int max_addresses;
832 u32 addr_flags;
833
834 write_lock(&idev->lock);
835 if (ift) {
836 spin_lock_bh(&ift->lock);
837 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
838 spin_unlock_bh(&ift->lock);
839 tmpaddr = &addr;
840 } else {
841 tmpaddr = NULL;
842 }
843 retry:
844 in6_dev_hold(idev);
845 if (idev->cnf.use_tempaddr <= 0) {
846 write_unlock(&idev->lock);
847 printk(KERN_INFO
848 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
849 in6_dev_put(idev);
850 ret = -1;
851 goto out;
852 }
853 spin_lock_bh(&ifp->lock);
854 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
855 idev->cnf.use_tempaddr = -1; /*XXX*/
856 spin_unlock_bh(&ifp->lock);
857 write_unlock(&idev->lock);
858 printk(KERN_WARNING
859 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
860 in6_dev_put(idev);
861 ret = -1;
862 goto out;
863 }
864 in6_ifa_hold(ifp);
865 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
866 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
867 spin_unlock_bh(&ifp->lock);
868 write_unlock(&idev->lock);
869 printk(KERN_WARNING
870 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
871 in6_ifa_put(ifp);
872 in6_dev_put(idev);
873 ret = -1;
874 goto out;
875 }
876 memcpy(&addr.s6_addr[8], idev->rndid, 8);
877 age = (jiffies - ifp->tstamp) / HZ;
878 tmp_valid_lft = min_t(__u32,
879 ifp->valid_lft,
880 idev->cnf.temp_valid_lft + age);
881 tmp_prefered_lft = min_t(__u32,
882 ifp->prefered_lft,
883 idev->cnf.temp_prefered_lft + age -
884 idev->cnf.max_desync_factor);
885 tmp_plen = ifp->prefix_len;
886 max_addresses = idev->cnf.max_addresses;
887 tmp_cstamp = ifp->cstamp;
888 tmp_tstamp = ifp->tstamp;
889 spin_unlock_bh(&ifp->lock);
890
891 regen_advance = idev->cnf.regen_max_retry *
892 idev->cnf.dad_transmits *
893 idev->nd_parms->retrans_time / HZ;
894 write_unlock(&idev->lock);
895
896 /* A temporary address is created only if this calculated Preferred
897 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
898 * an implementation must not create a temporary address with a zero
899 * Preferred Lifetime.
900 */
901 if (tmp_prefered_lft <= regen_advance) {
902 in6_ifa_put(ifp);
903 in6_dev_put(idev);
904 ret = -1;
905 goto out;
906 }
907
908 addr_flags = IFA_F_TEMPORARY;
909 /* set in addrconf_prefix_rcv() */
910 if (ifp->flags & IFA_F_OPTIMISTIC)
911 addr_flags |= IFA_F_OPTIMISTIC;
912
913 ift = !max_addresses ||
914 ipv6_count_addresses(idev) < max_addresses ?
915 ipv6_add_addr(idev, &addr, tmp_plen,
916 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
917 addr_flags) : NULL;
918 if (!ift || IS_ERR(ift)) {
919 in6_ifa_put(ifp);
920 in6_dev_put(idev);
921 printk(KERN_INFO
922 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
923 tmpaddr = &addr;
924 write_lock(&idev->lock);
925 goto retry;
926 }
927
928 spin_lock_bh(&ift->lock);
929 ift->ifpub = ifp;
930 ift->valid_lft = tmp_valid_lft;
931 ift->prefered_lft = tmp_prefered_lft;
932 ift->cstamp = tmp_cstamp;
933 ift->tstamp = tmp_tstamp;
934 spin_unlock_bh(&ift->lock);
935
936 addrconf_dad_start(ift, 0);
937 in6_ifa_put(ift);
938 in6_dev_put(idev);
939 out:
940 return ret;
941 }
942 #endif
943
944 /*
945 * Choose an appropriate source address (RFC3484)
946 */
947 enum {
948 IPV6_SADDR_RULE_INIT = 0,
949 IPV6_SADDR_RULE_LOCAL,
950 IPV6_SADDR_RULE_SCOPE,
951 IPV6_SADDR_RULE_PREFERRED,
952 #ifdef CONFIG_IPV6_MIP6
953 IPV6_SADDR_RULE_HOA,
954 #endif
955 IPV6_SADDR_RULE_OIF,
956 IPV6_SADDR_RULE_LABEL,
957 #ifdef CONFIG_IPV6_PRIVACY
958 IPV6_SADDR_RULE_PRIVACY,
959 #endif
960 IPV6_SADDR_RULE_ORCHID,
961 IPV6_SADDR_RULE_PREFIX,
962 IPV6_SADDR_RULE_MAX
963 };
964
965 struct ipv6_saddr_score {
966 int rule;
967 int addr_type;
968 struct inet6_ifaddr *ifa;
969 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
970 int scopedist;
971 int matchlen;
972 };
973
974 struct ipv6_saddr_dst {
975 const struct in6_addr *addr;
976 int ifindex;
977 int scope;
978 int label;
979 unsigned int prefs;
980 };
981
982 static inline int ipv6_saddr_preferred(int type)
983 {
984 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
985 return 1;
986 return 0;
987 }
988
989 static int ipv6_get_saddr_eval(struct net *net,
990 struct ipv6_saddr_score *score,
991 struct ipv6_saddr_dst *dst,
992 int i)
993 {
994 int ret;
995
996 if (i <= score->rule) {
997 switch (i) {
998 case IPV6_SADDR_RULE_SCOPE:
999 ret = score->scopedist;
1000 break;
1001 case IPV6_SADDR_RULE_PREFIX:
1002 ret = score->matchlen;
1003 break;
1004 default:
1005 ret = !!test_bit(i, score->scorebits);
1006 }
1007 goto out;
1008 }
1009
1010 switch (i) {
1011 case IPV6_SADDR_RULE_INIT:
1012 /* Rule 0: remember if hiscore is not ready yet */
1013 ret = !!score->ifa;
1014 break;
1015 case IPV6_SADDR_RULE_LOCAL:
1016 /* Rule 1: Prefer same address */
1017 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1018 break;
1019 case IPV6_SADDR_RULE_SCOPE:
1020 /* Rule 2: Prefer appropriate scope
1021 *
1022 * ret
1023 * ^
1024 * -1 | d 15
1025 * ---+--+-+---> scope
1026 * |
1027 * | d is scope of the destination.
1028 * B-d | \
1029 * | \ <- smaller scope is better if
1030 * B-15 | \ if scope is enough for destinaion.
1031 * | ret = B - scope (-1 <= scope >= d <= 15).
1032 * d-C-1 | /
1033 * |/ <- greater is better
1034 * -C / if scope is not enough for destination.
1035 * /| ret = scope - C (-1 <= d < scope <= 15).
1036 *
1037 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1038 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1039 * Assume B = 0 and we get C > 29.
1040 */
1041 ret = __ipv6_addr_src_scope(score->addr_type);
1042 if (ret >= dst->scope)
1043 ret = -ret;
1044 else
1045 ret -= 128; /* 30 is enough */
1046 score->scopedist = ret;
1047 break;
1048 case IPV6_SADDR_RULE_PREFERRED:
1049 /* Rule 3: Avoid deprecated and optimistic addresses */
1050 ret = ipv6_saddr_preferred(score->addr_type) ||
1051 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1052 break;
1053 #ifdef CONFIG_IPV6_MIP6
1054 case IPV6_SADDR_RULE_HOA:
1055 {
1056 /* Rule 4: Prefer home address */
1057 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1058 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1059 break;
1060 }
1061 #endif
1062 case IPV6_SADDR_RULE_OIF:
1063 /* Rule 5: Prefer outgoing interface */
1064 ret = (!dst->ifindex ||
1065 dst->ifindex == score->ifa->idev->dev->ifindex);
1066 break;
1067 case IPV6_SADDR_RULE_LABEL:
1068 /* Rule 6: Prefer matching label */
1069 ret = ipv6_addr_label(net,
1070 &score->ifa->addr, score->addr_type,
1071 score->ifa->idev->dev->ifindex) == dst->label;
1072 break;
1073 #ifdef CONFIG_IPV6_PRIVACY
1074 case IPV6_SADDR_RULE_PRIVACY:
1075 {
1076 /* Rule 7: Prefer public address
1077 * Note: prefer temporary address if use_tempaddr >= 2
1078 */
1079 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1080 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1081 score->ifa->idev->cnf.use_tempaddr >= 2;
1082 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1083 break;
1084 }
1085 #endif
1086 case IPV6_SADDR_RULE_ORCHID:
1087 /* Rule 8-: Prefer ORCHID vs ORCHID or
1088 * non-ORCHID vs non-ORCHID
1089 */
1090 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1091 ipv6_addr_orchid(dst->addr));
1092 break;
1093 case IPV6_SADDR_RULE_PREFIX:
1094 /* Rule 8: Use longest matching prefix */
1095 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr,
1096 dst->addr);
1097 break;
1098 default:
1099 ret = 0;
1100 }
1101
1102 if (ret)
1103 __set_bit(i, score->scorebits);
1104 score->rule = i;
1105 out:
1106 return ret;
1107 }
1108
1109 int ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev,
1110 const struct in6_addr *daddr, unsigned int prefs,
1111 struct in6_addr *saddr)
1112 {
1113 struct ipv6_saddr_score scores[2],
1114 *score = &scores[0], *hiscore = &scores[1];
1115 struct ipv6_saddr_dst dst;
1116 struct net_device *dev;
1117 int dst_type;
1118
1119 dst_type = __ipv6_addr_type(daddr);
1120 dst.addr = daddr;
1121 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1122 dst.scope = __ipv6_addr_src_scope(dst_type);
1123 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1124 dst.prefs = prefs;
1125
1126 hiscore->rule = -1;
1127 hiscore->ifa = NULL;
1128
1129 rcu_read_lock();
1130
1131 for_each_netdev_rcu(net, dev) {
1132 struct inet6_dev *idev;
1133
1134 /* Candidate Source Address (section 4)
1135 * - multicast and link-local destination address,
1136 * the set of candidate source address MUST only
1137 * include addresses assigned to interfaces
1138 * belonging to the same link as the outgoing
1139 * interface.
1140 * (- For site-local destination addresses, the
1141 * set of candidate source addresses MUST only
1142 * include addresses assigned to interfaces
1143 * belonging to the same site as the outgoing
1144 * interface.)
1145 */
1146 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1147 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1148 dst.ifindex && dev->ifindex != dst.ifindex)
1149 continue;
1150
1151 idev = __in6_dev_get(dev);
1152 if (!idev)
1153 continue;
1154
1155 read_lock_bh(&idev->lock);
1156 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1157 int i;
1158
1159 /*
1160 * - Tentative Address (RFC2462 section 5.4)
1161 * - A tentative address is not considered
1162 * "assigned to an interface" in the traditional
1163 * sense, unless it is also flagged as optimistic.
1164 * - Candidate Source Address (section 4)
1165 * - In any case, anycast addresses, multicast
1166 * addresses, and the unspecified address MUST
1167 * NOT be included in a candidate set.
1168 */
1169 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1170 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1171 continue;
1172
1173 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1174
1175 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1176 score->addr_type & IPV6_ADDR_MULTICAST)) {
1177 LIMIT_NETDEBUG(KERN_DEBUG
1178 "ADDRCONF: unspecified / multicast address "
1179 "assigned as unicast address on %s",
1180 dev->name);
1181 continue;
1182 }
1183
1184 score->rule = -1;
1185 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1186
1187 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1188 int minihiscore, miniscore;
1189
1190 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1191 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1192
1193 if (minihiscore > miniscore) {
1194 if (i == IPV6_SADDR_RULE_SCOPE &&
1195 score->scopedist > 0) {
1196 /*
1197 * special case:
1198 * each remaining entry
1199 * has too small (not enough)
1200 * scope, because ifa entries
1201 * are sorted by their scope
1202 * values.
1203 */
1204 goto try_nextdev;
1205 }
1206 break;
1207 } else if (minihiscore < miniscore) {
1208 if (hiscore->ifa)
1209 in6_ifa_put(hiscore->ifa);
1210
1211 in6_ifa_hold(score->ifa);
1212
1213 swap(hiscore, score);
1214
1215 /* restore our iterator */
1216 score->ifa = hiscore->ifa;
1217
1218 break;
1219 }
1220 }
1221 }
1222 try_nextdev:
1223 read_unlock_bh(&idev->lock);
1224 }
1225 rcu_read_unlock();
1226
1227 if (!hiscore->ifa)
1228 return -EADDRNOTAVAIL;
1229
1230 ipv6_addr_copy(saddr, &hiscore->ifa->addr);
1231 in6_ifa_put(hiscore->ifa);
1232 return 0;
1233 }
1234 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1235
1236 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1237 unsigned char banned_flags)
1238 {
1239 struct inet6_dev *idev;
1240 int err = -EADDRNOTAVAIL;
1241
1242 rcu_read_lock();
1243 idev = __in6_dev_get(dev);
1244 if (idev) {
1245 struct inet6_ifaddr *ifp;
1246
1247 read_lock_bh(&idev->lock);
1248 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1249 if (ifp->scope == IFA_LINK &&
1250 !(ifp->flags & banned_flags)) {
1251 ipv6_addr_copy(addr, &ifp->addr);
1252 err = 0;
1253 break;
1254 }
1255 }
1256 read_unlock_bh(&idev->lock);
1257 }
1258 rcu_read_unlock();
1259 return err;
1260 }
1261
1262 static int ipv6_count_addresses(struct inet6_dev *idev)
1263 {
1264 int cnt = 0;
1265 struct inet6_ifaddr *ifp;
1266
1267 read_lock_bh(&idev->lock);
1268 list_for_each_entry(ifp, &idev->addr_list, if_list)
1269 cnt++;
1270 read_unlock_bh(&idev->lock);
1271 return cnt;
1272 }
1273
1274 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1275 struct net_device *dev, int strict)
1276 {
1277 struct inet6_ifaddr *ifp;
1278 struct hlist_node *node;
1279 unsigned int hash = ipv6_addr_hash(addr);
1280
1281 rcu_read_lock_bh();
1282 hlist_for_each_entry_rcu(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1283 if (!net_eq(dev_net(ifp->idev->dev), net))
1284 continue;
1285 if (ipv6_addr_equal(&ifp->addr, addr) &&
1286 !(ifp->flags&IFA_F_TENTATIVE) &&
1287 (dev == NULL || ifp->idev->dev == dev ||
1288 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1289 rcu_read_unlock_bh();
1290 return 1;
1291 }
1292 }
1293
1294 rcu_read_unlock_bh();
1295 return 0;
1296 }
1297 EXPORT_SYMBOL(ipv6_chk_addr);
1298
1299 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1300 struct net_device *dev)
1301 {
1302 unsigned int hash = ipv6_addr_hash(addr);
1303 struct inet6_ifaddr *ifp;
1304 struct hlist_node *node;
1305
1306 hlist_for_each_entry(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1307 if (!net_eq(dev_net(ifp->idev->dev), net))
1308 continue;
1309 if (ipv6_addr_equal(&ifp->addr, addr)) {
1310 if (dev == NULL || ifp->idev->dev == dev)
1311 return true;
1312 }
1313 }
1314 return false;
1315 }
1316
1317 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1318 {
1319 struct inet6_dev *idev;
1320 struct inet6_ifaddr *ifa;
1321 int onlink;
1322
1323 onlink = 0;
1324 rcu_read_lock();
1325 idev = __in6_dev_get(dev);
1326 if (idev) {
1327 read_lock_bh(&idev->lock);
1328 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1329 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1330 ifa->prefix_len);
1331 if (onlink)
1332 break;
1333 }
1334 read_unlock_bh(&idev->lock);
1335 }
1336 rcu_read_unlock();
1337 return onlink;
1338 }
1339
1340 EXPORT_SYMBOL(ipv6_chk_prefix);
1341
1342 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1343 struct net_device *dev, int strict)
1344 {
1345 struct inet6_ifaddr *ifp, *result = NULL;
1346 unsigned int hash = ipv6_addr_hash(addr);
1347 struct hlist_node *node;
1348
1349 rcu_read_lock_bh();
1350 hlist_for_each_entry_rcu_bh(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1351 if (!net_eq(dev_net(ifp->idev->dev), net))
1352 continue;
1353 if (ipv6_addr_equal(&ifp->addr, addr)) {
1354 if (dev == NULL || ifp->idev->dev == dev ||
1355 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1356 result = ifp;
1357 in6_ifa_hold(ifp);
1358 break;
1359 }
1360 }
1361 }
1362 rcu_read_unlock_bh();
1363
1364 return result;
1365 }
1366
1367 /* Gets referenced address, destroys ifaddr */
1368
1369 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1370 {
1371 if (ifp->flags&IFA_F_PERMANENT) {
1372 spin_lock_bh(&ifp->lock);
1373 addrconf_del_timer(ifp);
1374 ifp->flags |= IFA_F_TENTATIVE;
1375 if (dad_failed)
1376 ifp->flags |= IFA_F_DADFAILED;
1377 spin_unlock_bh(&ifp->lock);
1378 if (dad_failed)
1379 ipv6_ifa_notify(0, ifp);
1380 in6_ifa_put(ifp);
1381 #ifdef CONFIG_IPV6_PRIVACY
1382 } else if (ifp->flags&IFA_F_TEMPORARY) {
1383 struct inet6_ifaddr *ifpub;
1384 spin_lock_bh(&ifp->lock);
1385 ifpub = ifp->ifpub;
1386 if (ifpub) {
1387 in6_ifa_hold(ifpub);
1388 spin_unlock_bh(&ifp->lock);
1389 ipv6_create_tempaddr(ifpub, ifp);
1390 in6_ifa_put(ifpub);
1391 } else {
1392 spin_unlock_bh(&ifp->lock);
1393 }
1394 ipv6_del_addr(ifp);
1395 #endif
1396 } else
1397 ipv6_del_addr(ifp);
1398 }
1399
1400 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1401 {
1402 int err = -ENOENT;
1403
1404 spin_lock(&ifp->state_lock);
1405 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1406 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1407 err = 0;
1408 }
1409 spin_unlock(&ifp->state_lock);
1410
1411 return err;
1412 }
1413
1414 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1415 {
1416 struct inet6_dev *idev = ifp->idev;
1417
1418 if (addrconf_dad_end(ifp)) {
1419 in6_ifa_put(ifp);
1420 return;
1421 }
1422
1423 if (net_ratelimit())
1424 printk(KERN_INFO "%s: IPv6 duplicate address %pI6c detected!\n",
1425 ifp->idev->dev->name, &ifp->addr);
1426
1427 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1428 struct in6_addr addr;
1429
1430 addr.s6_addr32[0] = htonl(0xfe800000);
1431 addr.s6_addr32[1] = 0;
1432
1433 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1434 ipv6_addr_equal(&ifp->addr, &addr)) {
1435 /* DAD failed for link-local based on MAC address */
1436 idev->cnf.disable_ipv6 = 1;
1437
1438 printk(KERN_INFO "%s: IPv6 being disabled!\n",
1439 ifp->idev->dev->name);
1440 }
1441 }
1442
1443 addrconf_dad_stop(ifp, 1);
1444 }
1445
1446 /* Join to solicited addr multicast group. */
1447
1448 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1449 {
1450 struct in6_addr maddr;
1451
1452 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1453 return;
1454
1455 addrconf_addr_solict_mult(addr, &maddr);
1456 ipv6_dev_mc_inc(dev, &maddr);
1457 }
1458
1459 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1460 {
1461 struct in6_addr maddr;
1462
1463 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1464 return;
1465
1466 addrconf_addr_solict_mult(addr, &maddr);
1467 __ipv6_dev_mc_dec(idev, &maddr);
1468 }
1469
1470 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1471 {
1472 struct in6_addr addr;
1473 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1474 if (ipv6_addr_any(&addr))
1475 return;
1476 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1477 }
1478
1479 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1480 {
1481 struct in6_addr addr;
1482 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1483 if (ipv6_addr_any(&addr))
1484 return;
1485 __ipv6_dev_ac_dec(ifp->idev, &addr);
1486 }
1487
1488 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1489 {
1490 if (dev->addr_len != ETH_ALEN)
1491 return -1;
1492 memcpy(eui, dev->dev_addr, 3);
1493 memcpy(eui + 5, dev->dev_addr + 3, 3);
1494
1495 /*
1496 * The zSeries OSA network cards can be shared among various
1497 * OS instances, but the OSA cards have only one MAC address.
1498 * This leads to duplicate address conflicts in conjunction
1499 * with IPv6 if more than one instance uses the same card.
1500 *
1501 * The driver for these cards can deliver a unique 16-bit
1502 * identifier for each instance sharing the same card. It is
1503 * placed instead of 0xFFFE in the interface identifier. The
1504 * "u" bit of the interface identifier is not inverted in this
1505 * case. Hence the resulting interface identifier has local
1506 * scope according to RFC2373.
1507 */
1508 if (dev->dev_id) {
1509 eui[3] = (dev->dev_id >> 8) & 0xFF;
1510 eui[4] = dev->dev_id & 0xFF;
1511 } else {
1512 eui[3] = 0xFF;
1513 eui[4] = 0xFE;
1514 eui[0] ^= 2;
1515 }
1516 return 0;
1517 }
1518
1519 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1520 {
1521 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1522 if (dev->addr_len != ARCNET_ALEN)
1523 return -1;
1524 memset(eui, 0, 7);
1525 eui[7] = *(u8*)dev->dev_addr;
1526 return 0;
1527 }
1528
1529 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1530 {
1531 if (dev->addr_len != INFINIBAND_ALEN)
1532 return -1;
1533 memcpy(eui, dev->dev_addr + 12, 8);
1534 eui[0] |= 2;
1535 return 0;
1536 }
1537
1538 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1539 {
1540 if (addr == 0)
1541 return -1;
1542 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1543 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1544 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1545 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1546 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1547 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1548 eui[1] = 0;
1549 eui[2] = 0x5E;
1550 eui[3] = 0xFE;
1551 memcpy(eui + 4, &addr, 4);
1552 return 0;
1553 }
1554
1555 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1556 {
1557 if (dev->priv_flags & IFF_ISATAP)
1558 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1559 return -1;
1560 }
1561
1562 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
1563 {
1564 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1565 }
1566
1567 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1568 {
1569 switch (dev->type) {
1570 case ARPHRD_ETHER:
1571 case ARPHRD_FDDI:
1572 case ARPHRD_IEEE802_TR:
1573 return addrconf_ifid_eui48(eui, dev);
1574 case ARPHRD_ARCNET:
1575 return addrconf_ifid_arcnet(eui, dev);
1576 case ARPHRD_INFINIBAND:
1577 return addrconf_ifid_infiniband(eui, dev);
1578 case ARPHRD_SIT:
1579 return addrconf_ifid_sit(eui, dev);
1580 case ARPHRD_IPGRE:
1581 return addrconf_ifid_gre(eui, dev);
1582 }
1583 return -1;
1584 }
1585
1586 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1587 {
1588 int err = -1;
1589 struct inet6_ifaddr *ifp;
1590
1591 read_lock_bh(&idev->lock);
1592 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1593 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1594 memcpy(eui, ifp->addr.s6_addr+8, 8);
1595 err = 0;
1596 break;
1597 }
1598 }
1599 read_unlock_bh(&idev->lock);
1600 return err;
1601 }
1602
1603 #ifdef CONFIG_IPV6_PRIVACY
1604 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1605 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1606 {
1607 regen:
1608 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1609 idev->rndid[0] &= ~0x02;
1610
1611 /*
1612 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1613 * check if generated address is not inappropriate
1614 *
1615 * - Reserved subnet anycast (RFC 2526)
1616 * 11111101 11....11 1xxxxxxx
1617 * - ISATAP (RFC4214) 6.1
1618 * 00-00-5E-FE-xx-xx-xx-xx
1619 * - value 0
1620 * - XXX: already assigned to an address on the device
1621 */
1622 if (idev->rndid[0] == 0xfd &&
1623 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1624 (idev->rndid[7]&0x80))
1625 goto regen;
1626 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1627 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1628 goto regen;
1629 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1630 goto regen;
1631 }
1632
1633 return 0;
1634 }
1635
1636 static void ipv6_regen_rndid(unsigned long data)
1637 {
1638 struct inet6_dev *idev = (struct inet6_dev *) data;
1639 unsigned long expires;
1640
1641 rcu_read_lock_bh();
1642 write_lock_bh(&idev->lock);
1643
1644 if (idev->dead)
1645 goto out;
1646
1647 if (__ipv6_regen_rndid(idev) < 0)
1648 goto out;
1649
1650 expires = jiffies +
1651 idev->cnf.temp_prefered_lft * HZ -
1652 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time -
1653 idev->cnf.max_desync_factor * HZ;
1654 if (time_before(expires, jiffies)) {
1655 printk(KERN_WARNING
1656 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1657 idev->dev->name);
1658 goto out;
1659 }
1660
1661 if (!mod_timer(&idev->regen_timer, expires))
1662 in6_dev_hold(idev);
1663
1664 out:
1665 write_unlock_bh(&idev->lock);
1666 rcu_read_unlock_bh();
1667 in6_dev_put(idev);
1668 }
1669
1670 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1671 int ret = 0;
1672
1673 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1674 ret = __ipv6_regen_rndid(idev);
1675 return ret;
1676 }
1677 #endif
1678
1679 /*
1680 * Add prefix route.
1681 */
1682
1683 static void
1684 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1685 unsigned long expires, u32 flags)
1686 {
1687 struct fib6_config cfg = {
1688 .fc_table = RT6_TABLE_PREFIX,
1689 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1690 .fc_ifindex = dev->ifindex,
1691 .fc_expires = expires,
1692 .fc_dst_len = plen,
1693 .fc_flags = RTF_UP | flags,
1694 .fc_nlinfo.nl_net = dev_net(dev),
1695 .fc_protocol = RTPROT_KERNEL,
1696 };
1697
1698 ipv6_addr_copy(&cfg.fc_dst, pfx);
1699
1700 /* Prevent useless cloning on PtP SIT.
1701 This thing is done here expecting that the whole
1702 class of non-broadcast devices need not cloning.
1703 */
1704 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1705 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1706 cfg.fc_flags |= RTF_NONEXTHOP;
1707 #endif
1708
1709 ip6_route_add(&cfg);
1710 }
1711
1712 /* Create "default" multicast route to the interface */
1713
1714 static void addrconf_add_mroute(struct net_device *dev)
1715 {
1716 struct fib6_config cfg = {
1717 .fc_table = RT6_TABLE_LOCAL,
1718 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1719 .fc_ifindex = dev->ifindex,
1720 .fc_dst_len = 8,
1721 .fc_flags = RTF_UP,
1722 .fc_nlinfo.nl_net = dev_net(dev),
1723 };
1724
1725 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1726
1727 ip6_route_add(&cfg);
1728 }
1729
1730 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1731 static void sit_route_add(struct net_device *dev)
1732 {
1733 struct fib6_config cfg = {
1734 .fc_table = RT6_TABLE_MAIN,
1735 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1736 .fc_ifindex = dev->ifindex,
1737 .fc_dst_len = 96,
1738 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1739 .fc_nlinfo.nl_net = dev_net(dev),
1740 };
1741
1742 /* prefix length - 96 bits "::d.d.d.d" */
1743 ip6_route_add(&cfg);
1744 }
1745 #endif
1746
1747 static void addrconf_add_lroute(struct net_device *dev)
1748 {
1749 struct in6_addr addr;
1750
1751 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1752 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1753 }
1754
1755 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1756 {
1757 struct inet6_dev *idev;
1758
1759 ASSERT_RTNL();
1760
1761 idev = ipv6_find_idev(dev);
1762 if (!idev)
1763 return ERR_PTR(-ENOBUFS);
1764
1765 if (idev->cnf.disable_ipv6)
1766 return ERR_PTR(-EACCES);
1767
1768 /* Add default multicast route */
1769 addrconf_add_mroute(dev);
1770
1771 /* Add link local route */
1772 addrconf_add_lroute(dev);
1773 return idev;
1774 }
1775
1776 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1777 {
1778 struct prefix_info *pinfo;
1779 __u32 valid_lft;
1780 __u32 prefered_lft;
1781 int addr_type;
1782 struct inet6_dev *in6_dev;
1783 struct net *net = dev_net(dev);
1784
1785 pinfo = (struct prefix_info *) opt;
1786
1787 if (len < sizeof(struct prefix_info)) {
1788 ADBG(("addrconf: prefix option too short\n"));
1789 return;
1790 }
1791
1792 /*
1793 * Validation checks ([ADDRCONF], page 19)
1794 */
1795
1796 addr_type = ipv6_addr_type(&pinfo->prefix);
1797
1798 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1799 return;
1800
1801 valid_lft = ntohl(pinfo->valid);
1802 prefered_lft = ntohl(pinfo->prefered);
1803
1804 if (prefered_lft > valid_lft) {
1805 if (net_ratelimit())
1806 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1807 return;
1808 }
1809
1810 in6_dev = in6_dev_get(dev);
1811
1812 if (in6_dev == NULL) {
1813 if (net_ratelimit())
1814 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1815 return;
1816 }
1817
1818 /*
1819 * Two things going on here:
1820 * 1) Add routes for on-link prefixes
1821 * 2) Configure prefixes with the auto flag set
1822 */
1823
1824 if (pinfo->onlink) {
1825 struct rt6_info *rt;
1826 unsigned long rt_expires;
1827
1828 /* Avoid arithmetic overflow. Really, we could
1829 * save rt_expires in seconds, likely valid_lft,
1830 * but it would require division in fib gc, that it
1831 * not good.
1832 */
1833 if (HZ > USER_HZ)
1834 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
1835 else
1836 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
1837
1838 if (addrconf_finite_timeout(rt_expires))
1839 rt_expires *= HZ;
1840
1841 rt = rt6_lookup(net, &pinfo->prefix, NULL,
1842 dev->ifindex, 1);
1843
1844 if (rt && addrconf_is_prefix_route(rt)) {
1845 /* Autoconf prefix route */
1846 if (valid_lft == 0) {
1847 ip6_del_rt(rt);
1848 rt = NULL;
1849 } else if (addrconf_finite_timeout(rt_expires)) {
1850 /* not infinity */
1851 rt->rt6i_expires = jiffies + rt_expires;
1852 rt->rt6i_flags |= RTF_EXPIRES;
1853 } else {
1854 rt->rt6i_flags &= ~RTF_EXPIRES;
1855 rt->rt6i_expires = 0;
1856 }
1857 } else if (valid_lft) {
1858 clock_t expires = 0;
1859 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
1860 if (addrconf_finite_timeout(rt_expires)) {
1861 /* not infinity */
1862 flags |= RTF_EXPIRES;
1863 expires = jiffies_to_clock_t(rt_expires);
1864 }
1865 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1866 dev, expires, flags);
1867 }
1868 if (rt)
1869 dst_release(&rt->dst);
1870 }
1871
1872 /* Try to figure out our local address for this prefix */
1873
1874 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1875 struct inet6_ifaddr * ifp;
1876 struct in6_addr addr;
1877 int create = 0, update_lft = 0;
1878
1879 if (pinfo->prefix_len == 64) {
1880 memcpy(&addr, &pinfo->prefix, 8);
1881 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1882 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1883 in6_dev_put(in6_dev);
1884 return;
1885 }
1886 goto ok;
1887 }
1888 if (net_ratelimit())
1889 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1890 pinfo->prefix_len);
1891 in6_dev_put(in6_dev);
1892 return;
1893
1894 ok:
1895
1896 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1897
1898 if (ifp == NULL && valid_lft) {
1899 int max_addresses = in6_dev->cnf.max_addresses;
1900 u32 addr_flags = 0;
1901
1902 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1903 if (in6_dev->cnf.optimistic_dad &&
1904 !net->ipv6.devconf_all->forwarding)
1905 addr_flags = IFA_F_OPTIMISTIC;
1906 #endif
1907
1908 /* Do not allow to create too much of autoconfigured
1909 * addresses; this would be too easy way to crash kernel.
1910 */
1911 if (!max_addresses ||
1912 ipv6_count_addresses(in6_dev) < max_addresses)
1913 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1914 addr_type&IPV6_ADDR_SCOPE_MASK,
1915 addr_flags);
1916
1917 if (!ifp || IS_ERR(ifp)) {
1918 in6_dev_put(in6_dev);
1919 return;
1920 }
1921
1922 update_lft = create = 1;
1923 ifp->cstamp = jiffies;
1924 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1925 }
1926
1927 if (ifp) {
1928 int flags;
1929 unsigned long now;
1930 #ifdef CONFIG_IPV6_PRIVACY
1931 struct inet6_ifaddr *ift;
1932 #endif
1933 u32 stored_lft;
1934
1935 /* update lifetime (RFC2462 5.5.3 e) */
1936 spin_lock(&ifp->lock);
1937 now = jiffies;
1938 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1939 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1940 else
1941 stored_lft = 0;
1942 if (!update_lft && stored_lft) {
1943 if (valid_lft > MIN_VALID_LIFETIME ||
1944 valid_lft > stored_lft)
1945 update_lft = 1;
1946 else if (stored_lft <= MIN_VALID_LIFETIME) {
1947 /* valid_lft <= stored_lft is always true */
1948 /*
1949 * RFC 4862 Section 5.5.3e:
1950 * "Note that the preferred lifetime of
1951 * the corresponding address is always
1952 * reset to the Preferred Lifetime in
1953 * the received Prefix Information
1954 * option, regardless of whether the
1955 * valid lifetime is also reset or
1956 * ignored."
1957 *
1958 * So if the preferred lifetime in
1959 * this advertisement is different
1960 * than what we have stored, but the
1961 * valid lifetime is invalid, just
1962 * reset prefered_lft.
1963 *
1964 * We must set the valid lifetime
1965 * to the stored lifetime since we'll
1966 * be updating the timestamp below,
1967 * else we'll set it back to the
1968 * minimum.
1969 */
1970 if (prefered_lft != ifp->prefered_lft) {
1971 valid_lft = stored_lft;
1972 update_lft = 1;
1973 }
1974 } else {
1975 valid_lft = MIN_VALID_LIFETIME;
1976 if (valid_lft < prefered_lft)
1977 prefered_lft = valid_lft;
1978 update_lft = 1;
1979 }
1980 }
1981
1982 if (update_lft) {
1983 ifp->valid_lft = valid_lft;
1984 ifp->prefered_lft = prefered_lft;
1985 ifp->tstamp = now;
1986 flags = ifp->flags;
1987 ifp->flags &= ~IFA_F_DEPRECATED;
1988 spin_unlock(&ifp->lock);
1989
1990 if (!(flags&IFA_F_TENTATIVE))
1991 ipv6_ifa_notify(0, ifp);
1992 } else
1993 spin_unlock(&ifp->lock);
1994
1995 #ifdef CONFIG_IPV6_PRIVACY
1996 read_lock_bh(&in6_dev->lock);
1997 /* update all temporary addresses in the list */
1998 list_for_each_entry(ift, &in6_dev->tempaddr_list, tmp_list) {
1999 /*
2000 * When adjusting the lifetimes of an existing
2001 * temporary address, only lower the lifetimes.
2002 * Implementations must not increase the
2003 * lifetimes of an existing temporary address
2004 * when processing a Prefix Information Option.
2005 */
2006 if (ifp != ift->ifpub)
2007 continue;
2008
2009 spin_lock(&ift->lock);
2010 flags = ift->flags;
2011 if (ift->valid_lft > valid_lft &&
2012 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
2013 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
2014 if (ift->prefered_lft > prefered_lft &&
2015 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
2016 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
2017 spin_unlock(&ift->lock);
2018 if (!(flags&IFA_F_TENTATIVE))
2019 ipv6_ifa_notify(0, ift);
2020 }
2021
2022 if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) {
2023 /*
2024 * When a new public address is created as described in [ADDRCONF],
2025 * also create a new temporary address. Also create a temporary
2026 * address if it's enabled but no temporary address currently exists.
2027 */
2028 read_unlock_bh(&in6_dev->lock);
2029 ipv6_create_tempaddr(ifp, NULL);
2030 } else {
2031 read_unlock_bh(&in6_dev->lock);
2032 }
2033 #endif
2034 in6_ifa_put(ifp);
2035 addrconf_verify(0);
2036 }
2037 }
2038 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2039 in6_dev_put(in6_dev);
2040 }
2041
2042 /*
2043 * Set destination address.
2044 * Special case for SIT interfaces where we create a new "virtual"
2045 * device.
2046 */
2047 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2048 {
2049 struct in6_ifreq ireq;
2050 struct net_device *dev;
2051 int err = -EINVAL;
2052
2053 rtnl_lock();
2054
2055 err = -EFAULT;
2056 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2057 goto err_exit;
2058
2059 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2060
2061 err = -ENODEV;
2062 if (dev == NULL)
2063 goto err_exit;
2064
2065 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2066 if (dev->type == ARPHRD_SIT) {
2067 const struct net_device_ops *ops = dev->netdev_ops;
2068 struct ifreq ifr;
2069 struct ip_tunnel_parm p;
2070
2071 err = -EADDRNOTAVAIL;
2072 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2073 goto err_exit;
2074
2075 memset(&p, 0, sizeof(p));
2076 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2077 p.iph.saddr = 0;
2078 p.iph.version = 4;
2079 p.iph.ihl = 5;
2080 p.iph.protocol = IPPROTO_IPV6;
2081 p.iph.ttl = 64;
2082 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2083
2084 if (ops->ndo_do_ioctl) {
2085 mm_segment_t oldfs = get_fs();
2086
2087 set_fs(KERNEL_DS);
2088 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2089 set_fs(oldfs);
2090 } else
2091 err = -EOPNOTSUPP;
2092
2093 if (err == 0) {
2094 err = -ENOBUFS;
2095 dev = __dev_get_by_name(net, p.name);
2096 if (!dev)
2097 goto err_exit;
2098 err = dev_open(dev);
2099 }
2100 }
2101 #endif
2102
2103 err_exit:
2104 rtnl_unlock();
2105 return err;
2106 }
2107
2108 /*
2109 * Manual configuration of address on an interface
2110 */
2111 static int inet6_addr_add(struct net *net, int ifindex, const struct in6_addr *pfx,
2112 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
2113 __u32 valid_lft)
2114 {
2115 struct inet6_ifaddr *ifp;
2116 struct inet6_dev *idev;
2117 struct net_device *dev;
2118 int scope;
2119 u32 flags;
2120 clock_t expires;
2121 unsigned long timeout;
2122
2123 ASSERT_RTNL();
2124
2125 if (plen > 128)
2126 return -EINVAL;
2127
2128 /* check the lifetime */
2129 if (!valid_lft || prefered_lft > valid_lft)
2130 return -EINVAL;
2131
2132 dev = __dev_get_by_index(net, ifindex);
2133 if (!dev)
2134 return -ENODEV;
2135
2136 idev = addrconf_add_dev(dev);
2137 if (IS_ERR(idev))
2138 return PTR_ERR(idev);
2139
2140 scope = ipv6_addr_scope(pfx);
2141
2142 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2143 if (addrconf_finite_timeout(timeout)) {
2144 expires = jiffies_to_clock_t(timeout * HZ);
2145 valid_lft = timeout;
2146 flags = RTF_EXPIRES;
2147 } else {
2148 expires = 0;
2149 flags = 0;
2150 ifa_flags |= IFA_F_PERMANENT;
2151 }
2152
2153 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2154 if (addrconf_finite_timeout(timeout)) {
2155 if (timeout == 0)
2156 ifa_flags |= IFA_F_DEPRECATED;
2157 prefered_lft = timeout;
2158 }
2159
2160 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2161
2162 if (!IS_ERR(ifp)) {
2163 spin_lock_bh(&ifp->lock);
2164 ifp->valid_lft = valid_lft;
2165 ifp->prefered_lft = prefered_lft;
2166 ifp->tstamp = jiffies;
2167 spin_unlock_bh(&ifp->lock);
2168
2169 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2170 expires, flags);
2171 /*
2172 * Note that section 3.1 of RFC 4429 indicates
2173 * that the Optimistic flag should not be set for
2174 * manually configured addresses
2175 */
2176 addrconf_dad_start(ifp, 0);
2177 in6_ifa_put(ifp);
2178 addrconf_verify(0);
2179 return 0;
2180 }
2181
2182 return PTR_ERR(ifp);
2183 }
2184
2185 static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx,
2186 unsigned int plen)
2187 {
2188 struct inet6_ifaddr *ifp;
2189 struct inet6_dev *idev;
2190 struct net_device *dev;
2191
2192 if (plen > 128)
2193 return -EINVAL;
2194
2195 dev = __dev_get_by_index(net, ifindex);
2196 if (!dev)
2197 return -ENODEV;
2198
2199 if ((idev = __in6_dev_get(dev)) == NULL)
2200 return -ENXIO;
2201
2202 read_lock_bh(&idev->lock);
2203 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2204 if (ifp->prefix_len == plen &&
2205 ipv6_addr_equal(pfx, &ifp->addr)) {
2206 in6_ifa_hold(ifp);
2207 read_unlock_bh(&idev->lock);
2208
2209 ipv6_del_addr(ifp);
2210
2211 /* If the last address is deleted administratively,
2212 disable IPv6 on this interface.
2213 */
2214 if (list_empty(&idev->addr_list))
2215 addrconf_ifdown(idev->dev, 1);
2216 return 0;
2217 }
2218 }
2219 read_unlock_bh(&idev->lock);
2220 return -EADDRNOTAVAIL;
2221 }
2222
2223
2224 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2225 {
2226 struct in6_ifreq ireq;
2227 int err;
2228
2229 if (!capable(CAP_NET_ADMIN))
2230 return -EPERM;
2231
2232 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2233 return -EFAULT;
2234
2235 rtnl_lock();
2236 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2237 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2238 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2239 rtnl_unlock();
2240 return err;
2241 }
2242
2243 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2244 {
2245 struct in6_ifreq ireq;
2246 int err;
2247
2248 if (!capable(CAP_NET_ADMIN))
2249 return -EPERM;
2250
2251 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2252 return -EFAULT;
2253
2254 rtnl_lock();
2255 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2256 ireq.ifr6_prefixlen);
2257 rtnl_unlock();
2258 return err;
2259 }
2260
2261 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2262 int plen, int scope)
2263 {
2264 struct inet6_ifaddr *ifp;
2265
2266 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT);
2267 if (!IS_ERR(ifp)) {
2268 spin_lock_bh(&ifp->lock);
2269 ifp->flags &= ~IFA_F_TENTATIVE;
2270 spin_unlock_bh(&ifp->lock);
2271 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2272 in6_ifa_put(ifp);
2273 }
2274 }
2275
2276 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2277 static void sit_add_v4_addrs(struct inet6_dev *idev)
2278 {
2279 struct in6_addr addr;
2280 struct net_device *dev;
2281 struct net *net = dev_net(idev->dev);
2282 int scope;
2283
2284 ASSERT_RTNL();
2285
2286 memset(&addr, 0, sizeof(struct in6_addr));
2287 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2288
2289 if (idev->dev->flags&IFF_POINTOPOINT) {
2290 addr.s6_addr32[0] = htonl(0xfe800000);
2291 scope = IFA_LINK;
2292 } else {
2293 scope = IPV6_ADDR_COMPATv4;
2294 }
2295
2296 if (addr.s6_addr32[3]) {
2297 add_addr(idev, &addr, 128, scope);
2298 return;
2299 }
2300
2301 for_each_netdev(net, dev) {
2302 struct in_device * in_dev = __in_dev_get_rtnl(dev);
2303 if (in_dev && (dev->flags & IFF_UP)) {
2304 struct in_ifaddr * ifa;
2305
2306 int flag = scope;
2307
2308 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2309 int plen;
2310
2311 addr.s6_addr32[3] = ifa->ifa_local;
2312
2313 if (ifa->ifa_scope == RT_SCOPE_LINK)
2314 continue;
2315 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2316 if (idev->dev->flags&IFF_POINTOPOINT)
2317 continue;
2318 flag |= IFA_HOST;
2319 }
2320 if (idev->dev->flags&IFF_POINTOPOINT)
2321 plen = 64;
2322 else
2323 plen = 96;
2324
2325 add_addr(idev, &addr, plen, flag);
2326 }
2327 }
2328 }
2329 }
2330 #endif
2331
2332 static void init_loopback(struct net_device *dev)
2333 {
2334 struct inet6_dev *idev;
2335
2336 /* ::1 */
2337
2338 ASSERT_RTNL();
2339
2340 if ((idev = ipv6_find_idev(dev)) == NULL) {
2341 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2342 return;
2343 }
2344
2345 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2346 }
2347
2348 static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr)
2349 {
2350 struct inet6_ifaddr * ifp;
2351 u32 addr_flags = IFA_F_PERMANENT;
2352
2353 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2354 if (idev->cnf.optimistic_dad &&
2355 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2356 addr_flags |= IFA_F_OPTIMISTIC;
2357 #endif
2358
2359
2360 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2361 if (!IS_ERR(ifp)) {
2362 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2363 addrconf_dad_start(ifp, 0);
2364 in6_ifa_put(ifp);
2365 }
2366 }
2367
2368 static void addrconf_dev_config(struct net_device *dev)
2369 {
2370 struct in6_addr addr;
2371 struct inet6_dev * idev;
2372
2373 ASSERT_RTNL();
2374
2375 if ((dev->type != ARPHRD_ETHER) &&
2376 (dev->type != ARPHRD_FDDI) &&
2377 (dev->type != ARPHRD_IEEE802_TR) &&
2378 (dev->type != ARPHRD_ARCNET) &&
2379 (dev->type != ARPHRD_INFINIBAND)) {
2380 /* Alas, we support only Ethernet autoconfiguration. */
2381 return;
2382 }
2383
2384 idev = addrconf_add_dev(dev);
2385 if (IS_ERR(idev))
2386 return;
2387
2388 memset(&addr, 0, sizeof(struct in6_addr));
2389 addr.s6_addr32[0] = htonl(0xFE800000);
2390
2391 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2392 addrconf_add_linklocal(idev, &addr);
2393 }
2394
2395 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2396 static void addrconf_sit_config(struct net_device *dev)
2397 {
2398 struct inet6_dev *idev;
2399
2400 ASSERT_RTNL();
2401
2402 /*
2403 * Configure the tunnel with one of our IPv4
2404 * addresses... we should configure all of
2405 * our v4 addrs in the tunnel
2406 */
2407
2408 if ((idev = ipv6_find_idev(dev)) == NULL) {
2409 printk(KERN_DEBUG "init sit: add_dev failed\n");
2410 return;
2411 }
2412
2413 if (dev->priv_flags & IFF_ISATAP) {
2414 struct in6_addr addr;
2415
2416 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2417 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2418 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2419 addrconf_add_linklocal(idev, &addr);
2420 return;
2421 }
2422
2423 sit_add_v4_addrs(idev);
2424
2425 if (dev->flags&IFF_POINTOPOINT) {
2426 addrconf_add_mroute(dev);
2427 addrconf_add_lroute(dev);
2428 } else
2429 sit_route_add(dev);
2430 }
2431 #endif
2432
2433 #if defined(CONFIG_NET_IPGRE) || defined(CONFIG_NET_IPGRE_MODULE)
2434 static void addrconf_gre_config(struct net_device *dev)
2435 {
2436 struct inet6_dev *idev;
2437 struct in6_addr addr;
2438
2439 pr_info("ipv6: addrconf_gre_config(%s)\n", dev->name);
2440
2441 ASSERT_RTNL();
2442
2443 if ((idev = ipv6_find_idev(dev)) == NULL) {
2444 printk(KERN_DEBUG "init gre: add_dev failed\n");
2445 return;
2446 }
2447
2448 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2449 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2450
2451 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2452 addrconf_add_linklocal(idev, &addr);
2453 }
2454 #endif
2455
2456 static inline int
2457 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2458 {
2459 struct in6_addr lladdr;
2460
2461 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2462 addrconf_add_linklocal(idev, &lladdr);
2463 return 0;
2464 }
2465 return -1;
2466 }
2467
2468 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2469 {
2470 struct net_device *link_dev;
2471 struct net *net = dev_net(idev->dev);
2472
2473 /* first try to inherit the link-local address from the link device */
2474 if (idev->dev->iflink &&
2475 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
2476 if (!ipv6_inherit_linklocal(idev, link_dev))
2477 return;
2478 }
2479 /* then try to inherit it from any device */
2480 for_each_netdev(net, link_dev) {
2481 if (!ipv6_inherit_linklocal(idev, link_dev))
2482 return;
2483 }
2484 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2485 }
2486
2487 /*
2488 * Autoconfigure tunnel with a link-local address so routing protocols,
2489 * DHCPv6, MLD etc. can be run over the virtual link
2490 */
2491
2492 static void addrconf_ip6_tnl_config(struct net_device *dev)
2493 {
2494 struct inet6_dev *idev;
2495
2496 ASSERT_RTNL();
2497
2498 idev = addrconf_add_dev(dev);
2499 if (IS_ERR(idev)) {
2500 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2501 return;
2502 }
2503 ip6_tnl_add_linklocal(idev);
2504 }
2505
2506 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2507 void * data)
2508 {
2509 struct net_device *dev = (struct net_device *) data;
2510 struct inet6_dev *idev = __in6_dev_get(dev);
2511 int run_pending = 0;
2512 int err;
2513
2514 switch (event) {
2515 case NETDEV_REGISTER:
2516 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2517 idev = ipv6_add_dev(dev);
2518 if (!idev)
2519 return notifier_from_errno(-ENOMEM);
2520 }
2521 break;
2522
2523 case NETDEV_UP:
2524 case NETDEV_CHANGE:
2525 if (dev->flags & IFF_SLAVE)
2526 break;
2527
2528 if (event == NETDEV_UP) {
2529 if (!addrconf_qdisc_ok(dev)) {
2530 /* device is not ready yet. */
2531 printk(KERN_INFO
2532 "ADDRCONF(NETDEV_UP): %s: "
2533 "link is not ready\n",
2534 dev->name);
2535 break;
2536 }
2537
2538 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2539 idev = ipv6_add_dev(dev);
2540
2541 if (idev) {
2542 idev->if_flags |= IF_READY;
2543 run_pending = 1;
2544 }
2545 } else {
2546 if (!addrconf_qdisc_ok(dev)) {
2547 /* device is still not ready. */
2548 break;
2549 }
2550
2551 if (idev) {
2552 if (idev->if_flags & IF_READY)
2553 /* device is already configured. */
2554 break;
2555 idev->if_flags |= IF_READY;
2556 }
2557
2558 printk(KERN_INFO
2559 "ADDRCONF(NETDEV_CHANGE): %s: "
2560 "link becomes ready\n",
2561 dev->name);
2562
2563 run_pending = 1;
2564 }
2565
2566 switch (dev->type) {
2567 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2568 case ARPHRD_SIT:
2569 addrconf_sit_config(dev);
2570 break;
2571 #endif
2572 #if defined(CONFIG_NET_IPGRE) || defined(CONFIG_NET_IPGRE_MODULE)
2573 case ARPHRD_IPGRE:
2574 addrconf_gre_config(dev);
2575 break;
2576 #endif
2577 case ARPHRD_TUNNEL6:
2578 addrconf_ip6_tnl_config(dev);
2579 break;
2580 case ARPHRD_LOOPBACK:
2581 init_loopback(dev);
2582 break;
2583
2584 default:
2585 addrconf_dev_config(dev);
2586 break;
2587 }
2588
2589 if (idev) {
2590 if (run_pending)
2591 addrconf_dad_run(idev);
2592
2593 /*
2594 * If the MTU changed during the interface down,
2595 * when the interface up, the changed MTU must be
2596 * reflected in the idev as well as routers.
2597 */
2598 if (idev->cnf.mtu6 != dev->mtu &&
2599 dev->mtu >= IPV6_MIN_MTU) {
2600 rt6_mtu_change(dev, dev->mtu);
2601 idev->cnf.mtu6 = dev->mtu;
2602 }
2603 idev->tstamp = jiffies;
2604 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2605
2606 /*
2607 * If the changed mtu during down is lower than
2608 * IPV6_MIN_MTU stop IPv6 on this interface.
2609 */
2610 if (dev->mtu < IPV6_MIN_MTU)
2611 addrconf_ifdown(dev, 1);
2612 }
2613 break;
2614
2615 case NETDEV_CHANGEMTU:
2616 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2617 rt6_mtu_change(dev, dev->mtu);
2618 idev->cnf.mtu6 = dev->mtu;
2619 break;
2620 }
2621
2622 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2623 idev = ipv6_add_dev(dev);
2624 if (idev)
2625 break;
2626 }
2627
2628 /*
2629 * MTU falled under IPV6_MIN_MTU.
2630 * Stop IPv6 on this interface.
2631 */
2632
2633 case NETDEV_DOWN:
2634 case NETDEV_UNREGISTER:
2635 /*
2636 * Remove all addresses from this interface.
2637 */
2638 addrconf_ifdown(dev, event != NETDEV_DOWN);
2639 break;
2640
2641 case NETDEV_CHANGENAME:
2642 if (idev) {
2643 snmp6_unregister_dev(idev);
2644 addrconf_sysctl_unregister(idev);
2645 addrconf_sysctl_register(idev);
2646 err = snmp6_register_dev(idev);
2647 if (err)
2648 return notifier_from_errno(err);
2649 }
2650 break;
2651
2652 case NETDEV_PRE_TYPE_CHANGE:
2653 case NETDEV_POST_TYPE_CHANGE:
2654 addrconf_type_change(dev, event);
2655 break;
2656 }
2657
2658 return NOTIFY_OK;
2659 }
2660
2661 /*
2662 * addrconf module should be notified of a device going up
2663 */
2664 static struct notifier_block ipv6_dev_notf = {
2665 .notifier_call = addrconf_notify,
2666 };
2667
2668 static void addrconf_type_change(struct net_device *dev, unsigned long event)
2669 {
2670 struct inet6_dev *idev;
2671 ASSERT_RTNL();
2672
2673 idev = __in6_dev_get(dev);
2674
2675 if (event == NETDEV_POST_TYPE_CHANGE)
2676 ipv6_mc_remap(idev);
2677 else if (event == NETDEV_PRE_TYPE_CHANGE)
2678 ipv6_mc_unmap(idev);
2679 }
2680
2681 static int addrconf_ifdown(struct net_device *dev, int how)
2682 {
2683 struct net *net = dev_net(dev);
2684 struct inet6_dev *idev;
2685 struct inet6_ifaddr *ifa;
2686 int state, i;
2687
2688 ASSERT_RTNL();
2689
2690 rt6_ifdown(net, dev);
2691 neigh_ifdown(&nd_tbl, dev);
2692
2693 idev = __in6_dev_get(dev);
2694 if (idev == NULL)
2695 return -ENODEV;
2696
2697 /*
2698 * Step 1: remove reference to ipv6 device from parent device.
2699 * Do not dev_put!
2700 */
2701 if (how) {
2702 idev->dead = 1;
2703
2704 /* protected by rtnl_lock */
2705 rcu_assign_pointer(dev->ip6_ptr, NULL);
2706
2707 /* Step 1.5: remove snmp6 entry */
2708 snmp6_unregister_dev(idev);
2709
2710 }
2711
2712 /* Step 2: clear hash table */
2713 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
2714 struct hlist_head *h = &inet6_addr_lst[i];
2715 struct hlist_node *n;
2716
2717 spin_lock_bh(&addrconf_hash_lock);
2718 restart:
2719 hlist_for_each_entry_rcu(ifa, n, h, addr_lst) {
2720 if (ifa->idev == idev) {
2721 hlist_del_init_rcu(&ifa->addr_lst);
2722 addrconf_del_timer(ifa);
2723 goto restart;
2724 }
2725 }
2726 spin_unlock_bh(&addrconf_hash_lock);
2727 }
2728
2729 write_lock_bh(&idev->lock);
2730
2731 /* Step 2: clear flags for stateless addrconf */
2732 if (!how)
2733 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2734
2735 #ifdef CONFIG_IPV6_PRIVACY
2736 if (how && del_timer(&idev->regen_timer))
2737 in6_dev_put(idev);
2738
2739 /* Step 3: clear tempaddr list */
2740 while (!list_empty(&idev->tempaddr_list)) {
2741 ifa = list_first_entry(&idev->tempaddr_list,
2742 struct inet6_ifaddr, tmp_list);
2743 list_del(&ifa->tmp_list);
2744 write_unlock_bh(&idev->lock);
2745 spin_lock_bh(&ifa->lock);
2746
2747 if (ifa->ifpub) {
2748 in6_ifa_put(ifa->ifpub);
2749 ifa->ifpub = NULL;
2750 }
2751 spin_unlock_bh(&ifa->lock);
2752 in6_ifa_put(ifa);
2753 write_lock_bh(&idev->lock);
2754 }
2755 #endif
2756
2757 while (!list_empty(&idev->addr_list)) {
2758 ifa = list_first_entry(&idev->addr_list,
2759 struct inet6_ifaddr, if_list);
2760 addrconf_del_timer(ifa);
2761
2762 list_del(&ifa->if_list);
2763
2764 write_unlock_bh(&idev->lock);
2765
2766 spin_lock_bh(&ifa->state_lock);
2767 state = ifa->state;
2768 ifa->state = INET6_IFADDR_STATE_DEAD;
2769 spin_unlock_bh(&ifa->state_lock);
2770
2771 if (state != INET6_IFADDR_STATE_DEAD) {
2772 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2773 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2774 }
2775 in6_ifa_put(ifa);
2776
2777 write_lock_bh(&idev->lock);
2778 }
2779
2780 write_unlock_bh(&idev->lock);
2781
2782 /* Step 5: Discard multicast list */
2783 if (how)
2784 ipv6_mc_destroy_dev(idev);
2785 else
2786 ipv6_mc_down(idev);
2787
2788 idev->tstamp = jiffies;
2789
2790 /* Last: Shot the device (if unregistered) */
2791 if (how) {
2792 addrconf_sysctl_unregister(idev);
2793 neigh_parms_release(&nd_tbl, idev->nd_parms);
2794 neigh_ifdown(&nd_tbl, dev);
2795 in6_dev_put(idev);
2796 }
2797 return 0;
2798 }
2799
2800 static void addrconf_rs_timer(unsigned long data)
2801 {
2802 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2803 struct inet6_dev *idev = ifp->idev;
2804
2805 read_lock(&idev->lock);
2806 if (idev->dead || !(idev->if_flags & IF_READY))
2807 goto out;
2808
2809 if (idev->cnf.forwarding)
2810 goto out;
2811
2812 /* Announcement received after solicitation was sent */
2813 if (idev->if_flags & IF_RA_RCVD)
2814 goto out;
2815
2816 spin_lock(&ifp->lock);
2817 if (ifp->probes++ < idev->cnf.rtr_solicits) {
2818 /* The wait after the last probe can be shorter */
2819 addrconf_mod_timer(ifp, AC_RS,
2820 (ifp->probes == idev->cnf.rtr_solicits) ?
2821 idev->cnf.rtr_solicit_delay :
2822 idev->cnf.rtr_solicit_interval);
2823 spin_unlock(&ifp->lock);
2824
2825 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2826 } else {
2827 spin_unlock(&ifp->lock);
2828 /*
2829 * Note: we do not support deprecated "all on-link"
2830 * assumption any longer.
2831 */
2832 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2833 idev->dev->name);
2834 }
2835
2836 out:
2837 read_unlock(&idev->lock);
2838 in6_ifa_put(ifp);
2839 }
2840
2841 /*
2842 * Duplicate Address Detection
2843 */
2844 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2845 {
2846 unsigned long rand_num;
2847 struct inet6_dev *idev = ifp->idev;
2848
2849 if (ifp->flags & IFA_F_OPTIMISTIC)
2850 rand_num = 0;
2851 else
2852 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2853
2854 ifp->probes = idev->cnf.dad_transmits;
2855 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2856 }
2857
2858 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2859 {
2860 struct inet6_dev *idev = ifp->idev;
2861 struct net_device *dev = idev->dev;
2862
2863 addrconf_join_solict(dev, &ifp->addr);
2864
2865 net_srandom(ifp->addr.s6_addr32[3]);
2866
2867 read_lock_bh(&idev->lock);
2868 spin_lock(&ifp->lock);
2869 if (ifp->state == INET6_IFADDR_STATE_DEAD)
2870 goto out;
2871
2872 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2873 idev->cnf.accept_dad < 1 ||
2874 !(ifp->flags&IFA_F_TENTATIVE) ||
2875 ifp->flags & IFA_F_NODAD) {
2876 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
2877 spin_unlock(&ifp->lock);
2878 read_unlock_bh(&idev->lock);
2879
2880 addrconf_dad_completed(ifp);
2881 return;
2882 }
2883
2884 if (!(idev->if_flags & IF_READY)) {
2885 spin_unlock(&ifp->lock);
2886 read_unlock_bh(&idev->lock);
2887 /*
2888 * If the device is not ready:
2889 * - keep it tentative if it is a permanent address.
2890 * - otherwise, kill it.
2891 */
2892 in6_ifa_hold(ifp);
2893 addrconf_dad_stop(ifp, 0);
2894 return;
2895 }
2896
2897 /*
2898 * Optimistic nodes can start receiving
2899 * Frames right away
2900 */
2901 if (ifp->flags & IFA_F_OPTIMISTIC)
2902 ip6_ins_rt(ifp->rt);
2903
2904 addrconf_dad_kick(ifp);
2905 out:
2906 spin_unlock(&ifp->lock);
2907 read_unlock_bh(&idev->lock);
2908 }
2909
2910 static void addrconf_dad_timer(unsigned long data)
2911 {
2912 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2913 struct inet6_dev *idev = ifp->idev;
2914 struct in6_addr mcaddr;
2915
2916 if (!ifp->probes && addrconf_dad_end(ifp))
2917 goto out;
2918
2919 read_lock(&idev->lock);
2920 if (idev->dead || !(idev->if_flags & IF_READY)) {
2921 read_unlock(&idev->lock);
2922 goto out;
2923 }
2924
2925 spin_lock(&ifp->lock);
2926 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
2927 spin_unlock(&ifp->lock);
2928 read_unlock(&idev->lock);
2929 goto out;
2930 }
2931
2932 if (ifp->probes == 0) {
2933 /*
2934 * DAD was successful
2935 */
2936
2937 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
2938 spin_unlock(&ifp->lock);
2939 read_unlock(&idev->lock);
2940
2941 addrconf_dad_completed(ifp);
2942
2943 goto out;
2944 }
2945
2946 ifp->probes--;
2947 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2948 spin_unlock(&ifp->lock);
2949 read_unlock(&idev->lock);
2950
2951 /* send a neighbour solicitation for our addr */
2952 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2953 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
2954 out:
2955 in6_ifa_put(ifp);
2956 }
2957
2958 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2959 {
2960 struct net_device *dev = ifp->idev->dev;
2961
2962 /*
2963 * Configure the address for reception. Now it is valid.
2964 */
2965
2966 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2967
2968 /* If added prefix is link local and forwarding is off,
2969 start sending router solicitations.
2970 */
2971
2972 if ((ifp->idev->cnf.forwarding == 0 ||
2973 ifp->idev->cnf.forwarding == 2) &&
2974 ifp->idev->cnf.rtr_solicits > 0 &&
2975 (dev->flags&IFF_LOOPBACK) == 0 &&
2976 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2977 /*
2978 * If a host as already performed a random delay
2979 * [...] as part of DAD [...] there is no need
2980 * to delay again before sending the first RS
2981 */
2982 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2983
2984 spin_lock_bh(&ifp->lock);
2985 ifp->probes = 1;
2986 ifp->idev->if_flags |= IF_RS_SENT;
2987 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2988 spin_unlock_bh(&ifp->lock);
2989 }
2990 }
2991
2992 static void addrconf_dad_run(struct inet6_dev *idev)
2993 {
2994 struct inet6_ifaddr *ifp;
2995
2996 read_lock_bh(&idev->lock);
2997 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2998 spin_lock(&ifp->lock);
2999 if (ifp->flags & IFA_F_TENTATIVE &&
3000 ifp->state == INET6_IFADDR_STATE_DAD)
3001 addrconf_dad_kick(ifp);
3002 spin_unlock(&ifp->lock);
3003 }
3004 read_unlock_bh(&idev->lock);
3005 }
3006
3007 #ifdef CONFIG_PROC_FS
3008 struct if6_iter_state {
3009 struct seq_net_private p;
3010 int bucket;
3011 };
3012
3013 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
3014 {
3015 struct inet6_ifaddr *ifa = NULL;
3016 struct if6_iter_state *state = seq->private;
3017 struct net *net = seq_file_net(seq);
3018
3019 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3020 struct hlist_node *n;
3021 hlist_for_each_entry_rcu_bh(ifa, n, &inet6_addr_lst[state->bucket],
3022 addr_lst)
3023 if (net_eq(dev_net(ifa->idev->dev), net))
3024 return ifa;
3025 }
3026 return NULL;
3027 }
3028
3029 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3030 struct inet6_ifaddr *ifa)
3031 {
3032 struct if6_iter_state *state = seq->private;
3033 struct net *net = seq_file_net(seq);
3034 struct hlist_node *n = &ifa->addr_lst;
3035
3036 hlist_for_each_entry_continue_rcu_bh(ifa, n, addr_lst)
3037 if (net_eq(dev_net(ifa->idev->dev), net))
3038 return ifa;
3039
3040 while (++state->bucket < IN6_ADDR_HSIZE) {
3041 hlist_for_each_entry_rcu_bh(ifa, n,
3042 &inet6_addr_lst[state->bucket], addr_lst) {
3043 if (net_eq(dev_net(ifa->idev->dev), net))
3044 return ifa;
3045 }
3046 }
3047
3048 return NULL;
3049 }
3050
3051 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
3052 {
3053 struct inet6_ifaddr *ifa = if6_get_first(seq);
3054
3055 if (ifa)
3056 while (pos && (ifa = if6_get_next(seq, ifa)) != NULL)
3057 --pos;
3058 return pos ? NULL : ifa;
3059 }
3060
3061 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3062 __acquires(rcu_bh)
3063 {
3064 rcu_read_lock_bh();
3065 return if6_get_idx(seq, *pos);
3066 }
3067
3068 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3069 {
3070 struct inet6_ifaddr *ifa;
3071
3072 ifa = if6_get_next(seq, v);
3073 ++*pos;
3074 return ifa;
3075 }
3076
3077 static void if6_seq_stop(struct seq_file *seq, void *v)
3078 __releases(rcu_bh)
3079 {
3080 rcu_read_unlock_bh();
3081 }
3082
3083 static int if6_seq_show(struct seq_file *seq, void *v)
3084 {
3085 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3086 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3087 &ifp->addr,
3088 ifp->idev->dev->ifindex,
3089 ifp->prefix_len,
3090 ifp->scope,
3091 ifp->flags,
3092 ifp->idev->dev->name);
3093 return 0;
3094 }
3095
3096 static const struct seq_operations if6_seq_ops = {
3097 .start = if6_seq_start,
3098 .next = if6_seq_next,
3099 .show = if6_seq_show,
3100 .stop = if6_seq_stop,
3101 };
3102
3103 static int if6_seq_open(struct inode *inode, struct file *file)
3104 {
3105 return seq_open_net(inode, file, &if6_seq_ops,
3106 sizeof(struct if6_iter_state));
3107 }
3108
3109 static const struct file_operations if6_fops = {
3110 .owner = THIS_MODULE,
3111 .open = if6_seq_open,
3112 .read = seq_read,
3113 .llseek = seq_lseek,
3114 .release = seq_release_net,
3115 };
3116
3117 static int __net_init if6_proc_net_init(struct net *net)
3118 {
3119 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
3120 return -ENOMEM;
3121 return 0;
3122 }
3123
3124 static void __net_exit if6_proc_net_exit(struct net *net)
3125 {
3126 proc_net_remove(net, "if_inet6");
3127 }
3128
3129 static struct pernet_operations if6_proc_net_ops = {
3130 .init = if6_proc_net_init,
3131 .exit = if6_proc_net_exit,
3132 };
3133
3134 int __init if6_proc_init(void)
3135 {
3136 return register_pernet_subsys(&if6_proc_net_ops);
3137 }
3138
3139 void if6_proc_exit(void)
3140 {
3141 unregister_pernet_subsys(&if6_proc_net_ops);
3142 }
3143 #endif /* CONFIG_PROC_FS */
3144
3145 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3146 /* Check if address is a home address configured on any interface. */
3147 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3148 {
3149 int ret = 0;
3150 struct inet6_ifaddr *ifp = NULL;
3151 struct hlist_node *n;
3152 unsigned int hash = ipv6_addr_hash(addr);
3153
3154 rcu_read_lock_bh();
3155 hlist_for_each_entry_rcu_bh(ifp, n, &inet6_addr_lst[hash], addr_lst) {
3156 if (!net_eq(dev_net(ifp->idev->dev), net))
3157 continue;
3158 if (ipv6_addr_equal(&ifp->addr, addr) &&
3159 (ifp->flags & IFA_F_HOMEADDRESS)) {
3160 ret = 1;
3161 break;
3162 }
3163 }
3164 rcu_read_unlock_bh();
3165 return ret;
3166 }
3167 #endif
3168
3169 /*
3170 * Periodic address status verification
3171 */
3172
3173 static void addrconf_verify(unsigned long foo)
3174 {
3175 unsigned long now, next, next_sec, next_sched;
3176 struct inet6_ifaddr *ifp;
3177 struct hlist_node *node;
3178 int i;
3179
3180 rcu_read_lock_bh();
3181 spin_lock(&addrconf_verify_lock);
3182 now = jiffies;
3183 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3184
3185 del_timer(&addr_chk_timer);
3186
3187 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3188 restart:
3189 hlist_for_each_entry_rcu_bh(ifp, node,
3190 &inet6_addr_lst[i], addr_lst) {
3191 unsigned long age;
3192
3193 if (ifp->flags & IFA_F_PERMANENT)
3194 continue;
3195
3196 spin_lock(&ifp->lock);
3197 /* We try to batch several events at once. */
3198 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3199
3200 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3201 age >= ifp->valid_lft) {
3202 spin_unlock(&ifp->lock);
3203 in6_ifa_hold(ifp);
3204 ipv6_del_addr(ifp);
3205 goto restart;
3206 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3207 spin_unlock(&ifp->lock);
3208 continue;
3209 } else if (age >= ifp->prefered_lft) {
3210 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3211 int deprecate = 0;
3212
3213 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3214 deprecate = 1;
3215 ifp->flags |= IFA_F_DEPRECATED;
3216 }
3217
3218 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3219 next = ifp->tstamp + ifp->valid_lft * HZ;
3220
3221 spin_unlock(&ifp->lock);
3222
3223 if (deprecate) {
3224 in6_ifa_hold(ifp);
3225
3226 ipv6_ifa_notify(0, ifp);
3227 in6_ifa_put(ifp);
3228 goto restart;
3229 }
3230 #ifdef CONFIG_IPV6_PRIVACY
3231 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3232 !(ifp->flags&IFA_F_TENTATIVE)) {
3233 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3234 ifp->idev->cnf.dad_transmits *
3235 ifp->idev->nd_parms->retrans_time / HZ;
3236
3237 if (age >= ifp->prefered_lft - regen_advance) {
3238 struct inet6_ifaddr *ifpub = ifp->ifpub;
3239 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3240 next = ifp->tstamp + ifp->prefered_lft * HZ;
3241 if (!ifp->regen_count && ifpub) {
3242 ifp->regen_count++;
3243 in6_ifa_hold(ifp);
3244 in6_ifa_hold(ifpub);
3245 spin_unlock(&ifp->lock);
3246
3247 spin_lock(&ifpub->lock);
3248 ifpub->regen_count = 0;
3249 spin_unlock(&ifpub->lock);
3250 ipv6_create_tempaddr(ifpub, ifp);
3251 in6_ifa_put(ifpub);
3252 in6_ifa_put(ifp);
3253 goto restart;
3254 }
3255 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3256 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3257 spin_unlock(&ifp->lock);
3258 #endif
3259 } else {
3260 /* ifp->prefered_lft <= ifp->valid_lft */
3261 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3262 next = ifp->tstamp + ifp->prefered_lft * HZ;
3263 spin_unlock(&ifp->lock);
3264 }
3265 }
3266 }
3267
3268 next_sec = round_jiffies_up(next);
3269 next_sched = next;
3270
3271 /* If rounded timeout is accurate enough, accept it. */
3272 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3273 next_sched = next_sec;
3274
3275 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3276 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3277 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3278
3279 ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3280 now, next, next_sec, next_sched));
3281
3282 addr_chk_timer.expires = next_sched;
3283 add_timer(&addr_chk_timer);
3284 spin_unlock(&addrconf_verify_lock);
3285 rcu_read_unlock_bh();
3286 }
3287
3288 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3289 {
3290 struct in6_addr *pfx = NULL;
3291
3292 if (addr)
3293 pfx = nla_data(addr);
3294
3295 if (local) {
3296 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3297 pfx = NULL;
3298 else
3299 pfx = nla_data(local);
3300 }
3301
3302 return pfx;
3303 }
3304
3305 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3306 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3307 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3308 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3309 };
3310
3311 static int
3312 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3313 {
3314 struct net *net = sock_net(skb->sk);
3315 struct ifaddrmsg *ifm;
3316 struct nlattr *tb[IFA_MAX+1];
3317 struct in6_addr *pfx;
3318 int err;
3319
3320 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3321 if (err < 0)
3322 return err;
3323
3324 ifm = nlmsg_data(nlh);
3325 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3326 if (pfx == NULL)
3327 return -EINVAL;
3328
3329 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3330 }
3331
3332 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3333 u32 prefered_lft, u32 valid_lft)
3334 {
3335 u32 flags;
3336 clock_t expires;
3337 unsigned long timeout;
3338
3339 if (!valid_lft || (prefered_lft > valid_lft))
3340 return -EINVAL;
3341
3342 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3343 if (addrconf_finite_timeout(timeout)) {
3344 expires = jiffies_to_clock_t(timeout * HZ);
3345 valid_lft = timeout;
3346 flags = RTF_EXPIRES;
3347 } else {
3348 expires = 0;
3349 flags = 0;
3350 ifa_flags |= IFA_F_PERMANENT;
3351 }
3352
3353 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3354 if (addrconf_finite_timeout(timeout)) {
3355 if (timeout == 0)
3356 ifa_flags |= IFA_F_DEPRECATED;
3357 prefered_lft = timeout;
3358 }
3359
3360 spin_lock_bh(&ifp->lock);
3361 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3362 ifp->tstamp = jiffies;
3363 ifp->valid_lft = valid_lft;
3364 ifp->prefered_lft = prefered_lft;
3365
3366 spin_unlock_bh(&ifp->lock);
3367 if (!(ifp->flags&IFA_F_TENTATIVE))
3368 ipv6_ifa_notify(0, ifp);
3369
3370 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3371 expires, flags);
3372 addrconf_verify(0);
3373
3374 return 0;
3375 }
3376
3377 static int
3378 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3379 {
3380 struct net *net = sock_net(skb->sk);
3381 struct ifaddrmsg *ifm;
3382 struct nlattr *tb[IFA_MAX+1];
3383 struct in6_addr *pfx;
3384 struct inet6_ifaddr *ifa;
3385 struct net_device *dev;
3386 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3387 u8 ifa_flags;
3388 int err;
3389
3390 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3391 if (err < 0)
3392 return err;
3393
3394 ifm = nlmsg_data(nlh);
3395 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3396 if (pfx == NULL)
3397 return -EINVAL;
3398
3399 if (tb[IFA_CACHEINFO]) {
3400 struct ifa_cacheinfo *ci;
3401
3402 ci = nla_data(tb[IFA_CACHEINFO]);
3403 valid_lft = ci->ifa_valid;
3404 preferred_lft = ci->ifa_prefered;
3405 } else {
3406 preferred_lft = INFINITY_LIFE_TIME;
3407 valid_lft = INFINITY_LIFE_TIME;
3408 }
3409
3410 dev = __dev_get_by_index(net, ifm->ifa_index);
3411 if (dev == NULL)
3412 return -ENODEV;
3413
3414 /* We ignore other flags so far. */
3415 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3416
3417 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3418 if (ifa == NULL) {
3419 /*
3420 * It would be best to check for !NLM_F_CREATE here but
3421 * userspace alreay relies on not having to provide this.
3422 */
3423 return inet6_addr_add(net, ifm->ifa_index, pfx,
3424 ifm->ifa_prefixlen, ifa_flags,
3425 preferred_lft, valid_lft);
3426 }
3427
3428 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3429 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3430 err = -EEXIST;
3431 else
3432 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3433
3434 in6_ifa_put(ifa);
3435
3436 return err;
3437 }
3438
3439 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3440 u8 scope, int ifindex)
3441 {
3442 struct ifaddrmsg *ifm;
3443
3444 ifm = nlmsg_data(nlh);
3445 ifm->ifa_family = AF_INET6;
3446 ifm->ifa_prefixlen = prefixlen;
3447 ifm->ifa_flags = flags;
3448 ifm->ifa_scope = scope;
3449 ifm->ifa_index = ifindex;
3450 }
3451
3452 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3453 unsigned long tstamp, u32 preferred, u32 valid)
3454 {
3455 struct ifa_cacheinfo ci;
3456
3457 ci.cstamp = cstamp_delta(cstamp);
3458 ci.tstamp = cstamp_delta(tstamp);
3459 ci.ifa_prefered = preferred;
3460 ci.ifa_valid = valid;
3461
3462 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3463 }
3464
3465 static inline int rt_scope(int ifa_scope)
3466 {
3467 if (ifa_scope & IFA_HOST)
3468 return RT_SCOPE_HOST;
3469 else if (ifa_scope & IFA_LINK)
3470 return RT_SCOPE_LINK;
3471 else if (ifa_scope & IFA_SITE)
3472 return RT_SCOPE_SITE;
3473 else
3474 return RT_SCOPE_UNIVERSE;
3475 }
3476
3477 static inline int inet6_ifaddr_msgsize(void)
3478 {
3479 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3480 + nla_total_size(16) /* IFA_ADDRESS */
3481 + nla_total_size(sizeof(struct ifa_cacheinfo));
3482 }
3483
3484 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3485 u32 pid, u32 seq, int event, unsigned int flags)
3486 {
3487 struct nlmsghdr *nlh;
3488 u32 preferred, valid;
3489
3490 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3491 if (nlh == NULL)
3492 return -EMSGSIZE;
3493
3494 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3495 ifa->idev->dev->ifindex);
3496
3497 if (!(ifa->flags&IFA_F_PERMANENT)) {
3498 preferred = ifa->prefered_lft;
3499 valid = ifa->valid_lft;
3500 if (preferred != INFINITY_LIFE_TIME) {
3501 long tval = (jiffies - ifa->tstamp)/HZ;
3502 if (preferred > tval)
3503 preferred -= tval;
3504 else
3505 preferred = 0;
3506 if (valid != INFINITY_LIFE_TIME) {
3507 if (valid > tval)
3508 valid -= tval;
3509 else
3510 valid = 0;
3511 }
3512 }
3513 } else {
3514 preferred = INFINITY_LIFE_TIME;
3515 valid = INFINITY_LIFE_TIME;
3516 }
3517
3518 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3519 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3520 nlmsg_cancel(skb, nlh);
3521 return -EMSGSIZE;
3522 }
3523
3524 return nlmsg_end(skb, nlh);
3525 }
3526
3527 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3528 u32 pid, u32 seq, int event, u16 flags)
3529 {
3530 struct nlmsghdr *nlh;
3531 u8 scope = RT_SCOPE_UNIVERSE;
3532 int ifindex = ifmca->idev->dev->ifindex;
3533
3534 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3535 scope = RT_SCOPE_SITE;
3536
3537 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3538 if (nlh == NULL)
3539 return -EMSGSIZE;
3540
3541 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3542 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3543 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3544 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3545 nlmsg_cancel(skb, nlh);
3546 return -EMSGSIZE;
3547 }
3548
3549 return nlmsg_end(skb, nlh);
3550 }
3551
3552 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3553 u32 pid, u32 seq, int event, unsigned int flags)
3554 {
3555 struct nlmsghdr *nlh;
3556 u8 scope = RT_SCOPE_UNIVERSE;
3557 int ifindex = ifaca->aca_idev->dev->ifindex;
3558
3559 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3560 scope = RT_SCOPE_SITE;
3561
3562 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3563 if (nlh == NULL)
3564 return -EMSGSIZE;
3565
3566 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3567 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3568 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3569 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3570 nlmsg_cancel(skb, nlh);
3571 return -EMSGSIZE;
3572 }
3573
3574 return nlmsg_end(skb, nlh);
3575 }
3576
3577 enum addr_type_t {
3578 UNICAST_ADDR,
3579 MULTICAST_ADDR,
3580 ANYCAST_ADDR,
3581 };
3582
3583 /* called with rcu_read_lock() */
3584 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3585 struct netlink_callback *cb, enum addr_type_t type,
3586 int s_ip_idx, int *p_ip_idx)
3587 {
3588 struct ifmcaddr6 *ifmca;
3589 struct ifacaddr6 *ifaca;
3590 int err = 1;
3591 int ip_idx = *p_ip_idx;
3592
3593 read_lock_bh(&idev->lock);
3594 switch (type) {
3595 case UNICAST_ADDR: {
3596 struct inet6_ifaddr *ifa;
3597
3598 /* unicast address incl. temp addr */
3599 list_for_each_entry(ifa, &idev->addr_list, if_list) {
3600 if (++ip_idx < s_ip_idx)
3601 continue;
3602 err = inet6_fill_ifaddr(skb, ifa,
3603 NETLINK_CB(cb->skb).pid,
3604 cb->nlh->nlmsg_seq,
3605 RTM_NEWADDR,
3606 NLM_F_MULTI);
3607 if (err <= 0)
3608 break;
3609 }
3610 break;
3611 }
3612 case MULTICAST_ADDR:
3613 /* multicast address */
3614 for (ifmca = idev->mc_list; ifmca;
3615 ifmca = ifmca->next, ip_idx++) {
3616 if (ip_idx < s_ip_idx)
3617 continue;
3618 err = inet6_fill_ifmcaddr(skb, ifmca,
3619 NETLINK_CB(cb->skb).pid,
3620 cb->nlh->nlmsg_seq,
3621 RTM_GETMULTICAST,
3622 NLM_F_MULTI);
3623 if (err <= 0)
3624 break;
3625 }
3626 break;
3627 case ANYCAST_ADDR:
3628 /* anycast address */
3629 for (ifaca = idev->ac_list; ifaca;
3630 ifaca = ifaca->aca_next, ip_idx++) {
3631 if (ip_idx < s_ip_idx)
3632 continue;
3633 err = inet6_fill_ifacaddr(skb, ifaca,
3634 NETLINK_CB(cb->skb).pid,
3635 cb->nlh->nlmsg_seq,
3636 RTM_GETANYCAST,
3637 NLM_F_MULTI);
3638 if (err <= 0)
3639 break;
3640 }
3641 break;
3642 default:
3643 break;
3644 }
3645 read_unlock_bh(&idev->lock);
3646 *p_ip_idx = ip_idx;
3647 return err;
3648 }
3649
3650 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3651 enum addr_type_t type)
3652 {
3653 struct net *net = sock_net(skb->sk);
3654 int h, s_h;
3655 int idx, ip_idx;
3656 int s_idx, s_ip_idx;
3657 struct net_device *dev;
3658 struct inet6_dev *idev;
3659 struct hlist_head *head;
3660 struct hlist_node *node;
3661
3662 s_h = cb->args[0];
3663 s_idx = idx = cb->args[1];
3664 s_ip_idx = ip_idx = cb->args[2];
3665
3666 rcu_read_lock();
3667 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3668 idx = 0;
3669 head = &net->dev_index_head[h];
3670 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3671 if (idx < s_idx)
3672 goto cont;
3673 if (h > s_h || idx > s_idx)
3674 s_ip_idx = 0;
3675 ip_idx = 0;
3676 idev = __in6_dev_get(dev);
3677 if (!idev)
3678 goto cont;
3679
3680 if (in6_dump_addrs(idev, skb, cb, type,
3681 s_ip_idx, &ip_idx) <= 0)
3682 goto done;
3683 cont:
3684 idx++;
3685 }
3686 }
3687 done:
3688 rcu_read_unlock();
3689 cb->args[0] = h;
3690 cb->args[1] = idx;
3691 cb->args[2] = ip_idx;
3692
3693 return skb->len;
3694 }
3695
3696 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3697 {
3698 enum addr_type_t type = UNICAST_ADDR;
3699
3700 return inet6_dump_addr(skb, cb, type);
3701 }
3702
3703 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3704 {
3705 enum addr_type_t type = MULTICAST_ADDR;
3706
3707 return inet6_dump_addr(skb, cb, type);
3708 }
3709
3710
3711 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3712 {
3713 enum addr_type_t type = ANYCAST_ADDR;
3714
3715 return inet6_dump_addr(skb, cb, type);
3716 }
3717
3718 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3719 void *arg)
3720 {
3721 struct net *net = sock_net(in_skb->sk);
3722 struct ifaddrmsg *ifm;
3723 struct nlattr *tb[IFA_MAX+1];
3724 struct in6_addr *addr = NULL;
3725 struct net_device *dev = NULL;
3726 struct inet6_ifaddr *ifa;
3727 struct sk_buff *skb;
3728 int err;
3729
3730 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3731 if (err < 0)
3732 goto errout;
3733
3734 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3735 if (addr == NULL) {
3736 err = -EINVAL;
3737 goto errout;
3738 }
3739
3740 ifm = nlmsg_data(nlh);
3741 if (ifm->ifa_index)
3742 dev = __dev_get_by_index(net, ifm->ifa_index);
3743
3744 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
3745 if (!ifa) {
3746 err = -EADDRNOTAVAIL;
3747 goto errout;
3748 }
3749
3750 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
3751 if (!skb) {
3752 err = -ENOBUFS;
3753 goto errout_ifa;
3754 }
3755
3756 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3757 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3758 if (err < 0) {
3759 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3760 WARN_ON(err == -EMSGSIZE);
3761 kfree_skb(skb);
3762 goto errout_ifa;
3763 }
3764 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
3765 errout_ifa:
3766 in6_ifa_put(ifa);
3767 errout:
3768 return err;
3769 }
3770
3771 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3772 {
3773 struct sk_buff *skb;
3774 struct net *net = dev_net(ifa->idev->dev);
3775 int err = -ENOBUFS;
3776
3777 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3778 if (skb == NULL)
3779 goto errout;
3780
3781 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3782 if (err < 0) {
3783 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3784 WARN_ON(err == -EMSGSIZE);
3785 kfree_skb(skb);
3786 goto errout;
3787 }
3788 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3789 return;
3790 errout:
3791 if (err < 0)
3792 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3793 }
3794
3795 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3796 __s32 *array, int bytes)
3797 {
3798 BUG_ON(bytes < (DEVCONF_MAX * 4));
3799
3800 memset(array, 0, bytes);
3801 array[DEVCONF_FORWARDING] = cnf->forwarding;
3802 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3803 array[DEVCONF_MTU6] = cnf->mtu6;
3804 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3805 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3806 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3807 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3808 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3809 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
3810 jiffies_to_msecs(cnf->rtr_solicit_interval);
3811 array[DEVCONF_RTR_SOLICIT_DELAY] =
3812 jiffies_to_msecs(cnf->rtr_solicit_delay);
3813 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3814 #ifdef CONFIG_IPV6_PRIVACY
3815 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3816 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3817 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3818 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3819 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3820 #endif
3821 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3822 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3823 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3824 #ifdef CONFIG_IPV6_ROUTER_PREF
3825 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3826 array[DEVCONF_RTR_PROBE_INTERVAL] =
3827 jiffies_to_msecs(cnf->rtr_probe_interval);
3828 #ifdef CONFIG_IPV6_ROUTE_INFO
3829 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3830 #endif
3831 #endif
3832 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3833 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3834 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3835 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3836 #endif
3837 #ifdef CONFIG_IPV6_MROUTE
3838 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
3839 #endif
3840 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
3841 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
3842 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
3843 }
3844
3845 static inline size_t inet6_ifla6_size(void)
3846 {
3847 return nla_total_size(4) /* IFLA_INET6_FLAGS */
3848 + nla_total_size(sizeof(struct ifla_cacheinfo))
3849 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3850 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3851 + nla_total_size(ICMP6_MIB_MAX * 8); /* IFLA_INET6_ICMP6STATS */
3852 }
3853
3854 static inline size_t inet6_if_nlmsg_size(void)
3855 {
3856 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3857 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3858 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3859 + nla_total_size(4) /* IFLA_MTU */
3860 + nla_total_size(4) /* IFLA_LINK */
3861 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
3862 }
3863
3864 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
3865 int items, int bytes)
3866 {
3867 int i;
3868 int pad = bytes - sizeof(u64) * items;
3869 BUG_ON(pad < 0);
3870
3871 /* Use put_unaligned() because stats may not be aligned for u64. */
3872 put_unaligned(items, &stats[0]);
3873 for (i = 1; i < items; i++)
3874 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
3875
3876 memset(&stats[items], 0, pad);
3877 }
3878
3879 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib,
3880 int items, int bytes, size_t syncpoff)
3881 {
3882 int i;
3883 int pad = bytes - sizeof(u64) * items;
3884 BUG_ON(pad < 0);
3885
3886 /* Use put_unaligned() because stats may not be aligned for u64. */
3887 put_unaligned(items, &stats[0]);
3888 for (i = 1; i < items; i++)
3889 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
3890
3891 memset(&stats[items], 0, pad);
3892 }
3893
3894 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3895 int bytes)
3896 {
3897 switch (attrtype) {
3898 case IFLA_INET6_STATS:
3899 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6,
3900 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
3901 break;
3902 case IFLA_INET6_ICMP6STATS:
3903 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
3904 break;
3905 }
3906 }
3907
3908 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
3909 {
3910 struct nlattr *nla;
3911 struct ifla_cacheinfo ci;
3912
3913 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
3914
3915 ci.max_reasm_len = IPV6_MAXPLEN;
3916 ci.tstamp = cstamp_delta(idev->tstamp);
3917 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
3918 ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time);
3919 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3920
3921 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3922 if (nla == NULL)
3923 goto nla_put_failure;
3924 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
3925
3926 /* XXX - MC not implemented */
3927
3928 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3929 if (nla == NULL)
3930 goto nla_put_failure;
3931 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3932
3933 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3934 if (nla == NULL)
3935 goto nla_put_failure;
3936 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
3937
3938 return 0;
3939
3940 nla_put_failure:
3941 return -EMSGSIZE;
3942 }
3943
3944 static size_t inet6_get_link_af_size(const struct net_device *dev)
3945 {
3946 if (!__in6_dev_get(dev))
3947 return 0;
3948
3949 return inet6_ifla6_size();
3950 }
3951
3952 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
3953 {
3954 struct inet6_dev *idev = __in6_dev_get(dev);
3955
3956 if (!idev)
3957 return -ENODATA;
3958
3959 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
3960 return -EMSGSIZE;
3961
3962 return 0;
3963 }
3964
3965 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3966 u32 pid, u32 seq, int event, unsigned int flags)
3967 {
3968 struct net_device *dev = idev->dev;
3969 struct ifinfomsg *hdr;
3970 struct nlmsghdr *nlh;
3971 void *protoinfo;
3972
3973 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3974 if (nlh == NULL)
3975 return -EMSGSIZE;
3976
3977 hdr = nlmsg_data(nlh);
3978 hdr->ifi_family = AF_INET6;
3979 hdr->__ifi_pad = 0;
3980 hdr->ifi_type = dev->type;
3981 hdr->ifi_index = dev->ifindex;
3982 hdr->ifi_flags = dev_get_flags(dev);
3983 hdr->ifi_change = 0;
3984
3985 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
3986
3987 if (dev->addr_len)
3988 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3989
3990 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
3991 if (dev->ifindex != dev->iflink)
3992 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
3993
3994 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3995 if (protoinfo == NULL)
3996 goto nla_put_failure;
3997
3998 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
3999 goto nla_put_failure;
4000
4001 nla_nest_end(skb, protoinfo);
4002 return nlmsg_end(skb, nlh);
4003
4004 nla_put_failure:
4005 nlmsg_cancel(skb, nlh);
4006 return -EMSGSIZE;
4007 }
4008
4009 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4010 {
4011 struct net *net = sock_net(skb->sk);
4012 int h, s_h;
4013 int idx = 0, s_idx;
4014 struct net_device *dev;
4015 struct inet6_dev *idev;
4016 struct hlist_head *head;
4017 struct hlist_node *node;
4018
4019 s_h = cb->args[0];
4020 s_idx = cb->args[1];
4021
4022 rcu_read_lock();
4023 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4024 idx = 0;
4025 head = &net->dev_index_head[h];
4026 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
4027 if (idx < s_idx)
4028 goto cont;
4029 idev = __in6_dev_get(dev);
4030 if (!idev)
4031 goto cont;
4032 if (inet6_fill_ifinfo(skb, idev,
4033 NETLINK_CB(cb->skb).pid,
4034 cb->nlh->nlmsg_seq,
4035 RTM_NEWLINK, NLM_F_MULTI) <= 0)
4036 goto out;
4037 cont:
4038 idx++;
4039 }
4040 }
4041 out:
4042 rcu_read_unlock();
4043 cb->args[1] = idx;
4044 cb->args[0] = h;
4045
4046 return skb->len;
4047 }
4048
4049 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4050 {
4051 struct sk_buff *skb;
4052 struct net *net = dev_net(idev->dev);
4053 int err = -ENOBUFS;
4054
4055 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
4056 if (skb == NULL)
4057 goto errout;
4058
4059 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
4060 if (err < 0) {
4061 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4062 WARN_ON(err == -EMSGSIZE);
4063 kfree_skb(skb);
4064 goto errout;
4065 }
4066 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
4067 return;
4068 errout:
4069 if (err < 0)
4070 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
4071 }
4072
4073 static inline size_t inet6_prefix_nlmsg_size(void)
4074 {
4075 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4076 + nla_total_size(sizeof(struct in6_addr))
4077 + nla_total_size(sizeof(struct prefix_cacheinfo));
4078 }
4079
4080 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
4081 struct prefix_info *pinfo, u32 pid, u32 seq,
4082 int event, unsigned int flags)
4083 {
4084 struct prefixmsg *pmsg;
4085 struct nlmsghdr *nlh;
4086 struct prefix_cacheinfo ci;
4087
4088 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
4089 if (nlh == NULL)
4090 return -EMSGSIZE;
4091
4092 pmsg = nlmsg_data(nlh);
4093 pmsg->prefix_family = AF_INET6;
4094 pmsg->prefix_pad1 = 0;
4095 pmsg->prefix_pad2 = 0;
4096 pmsg->prefix_ifindex = idev->dev->ifindex;
4097 pmsg->prefix_len = pinfo->prefix_len;
4098 pmsg->prefix_type = pinfo->type;
4099 pmsg->prefix_pad3 = 0;
4100 pmsg->prefix_flags = 0;
4101 if (pinfo->onlink)
4102 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4103 if (pinfo->autoconf)
4104 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4105
4106 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
4107
4108 ci.preferred_time = ntohl(pinfo->prefered);
4109 ci.valid_time = ntohl(pinfo->valid);
4110 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
4111
4112 return nlmsg_end(skb, nlh);
4113
4114 nla_put_failure:
4115 nlmsg_cancel(skb, nlh);
4116 return -EMSGSIZE;
4117 }
4118
4119 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
4120 struct prefix_info *pinfo)
4121 {
4122 struct sk_buff *skb;
4123 struct net *net = dev_net(idev->dev);
4124 int err = -ENOBUFS;
4125
4126 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
4127 if (skb == NULL)
4128 goto errout;
4129
4130 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
4131 if (err < 0) {
4132 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4133 WARN_ON(err == -EMSGSIZE);
4134 kfree_skb(skb);
4135 goto errout;
4136 }
4137 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4138 return;
4139 errout:
4140 if (err < 0)
4141 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
4142 }
4143
4144 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4145 {
4146 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4147
4148 switch (event) {
4149 case RTM_NEWADDR:
4150 /*
4151 * If the address was optimistic
4152 * we inserted the route at the start of
4153 * our DAD process, so we don't need
4154 * to do it again
4155 */
4156 if (!(ifp->rt->rt6i_node))
4157 ip6_ins_rt(ifp->rt);
4158 if (ifp->idev->cnf.forwarding)
4159 addrconf_join_anycast(ifp);
4160 break;
4161 case RTM_DELADDR:
4162 if (ifp->idev->cnf.forwarding)
4163 addrconf_leave_anycast(ifp);
4164 addrconf_leave_solict(ifp->idev, &ifp->addr);
4165 dst_hold(&ifp->rt->dst);
4166
4167 if (ip6_del_rt(ifp->rt))
4168 dst_free(&ifp->rt->dst);
4169 break;
4170 }
4171 }
4172
4173 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4174 {
4175 rcu_read_lock_bh();
4176 if (likely(ifp->idev->dead == 0))
4177 __ipv6_ifa_notify(event, ifp);
4178 rcu_read_unlock_bh();
4179 }
4180
4181 #ifdef CONFIG_SYSCTL
4182
4183 static
4184 int addrconf_sysctl_forward(ctl_table *ctl, int write,
4185 void __user *buffer, size_t *lenp, loff_t *ppos)
4186 {
4187 int *valp = ctl->data;
4188 int val = *valp;
4189 loff_t pos = *ppos;
4190 int ret;
4191
4192 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
4193
4194 if (write)
4195 ret = addrconf_fixup_forwarding(ctl, valp, val);
4196 if (ret)
4197 *ppos = pos;
4198 return ret;
4199 }
4200
4201 static void dev_disable_change(struct inet6_dev *idev)
4202 {
4203 if (!idev || !idev->dev)
4204 return;
4205
4206 if (idev->cnf.disable_ipv6)
4207 addrconf_notify(NULL, NETDEV_DOWN, idev->dev);
4208 else
4209 addrconf_notify(NULL, NETDEV_UP, idev->dev);
4210 }
4211
4212 static void addrconf_disable_change(struct net *net, __s32 newf)
4213 {
4214 struct net_device *dev;
4215 struct inet6_dev *idev;
4216
4217 rcu_read_lock();
4218 for_each_netdev_rcu(net, dev) {
4219 idev = __in6_dev_get(dev);
4220 if (idev) {
4221 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4222 idev->cnf.disable_ipv6 = newf;
4223 if (changed)
4224 dev_disable_change(idev);
4225 }
4226 }
4227 rcu_read_unlock();
4228 }
4229
4230 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int old)
4231 {
4232 struct net *net;
4233
4234 net = (struct net *)table->extra2;
4235
4236 if (p == &net->ipv6.devconf_dflt->disable_ipv6)
4237 return 0;
4238
4239 if (!rtnl_trylock()) {
4240 /* Restore the original values before restarting */
4241 *p = old;
4242 return restart_syscall();
4243 }
4244
4245 if (p == &net->ipv6.devconf_all->disable_ipv6) {
4246 __s32 newf = net->ipv6.devconf_all->disable_ipv6;
4247 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4248 addrconf_disable_change(net, newf);
4249 } else if ((!*p) ^ (!old))
4250 dev_disable_change((struct inet6_dev *)table->extra1);
4251
4252 rtnl_unlock();
4253 return 0;
4254 }
4255
4256 static
4257 int addrconf_sysctl_disable(ctl_table *ctl, int write,
4258 void __user *buffer, size_t *lenp, loff_t *ppos)
4259 {
4260 int *valp = ctl->data;
4261 int val = *valp;
4262 loff_t pos = *ppos;
4263 int ret;
4264
4265 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
4266
4267 if (write)
4268 ret = addrconf_disable_ipv6(ctl, valp, val);
4269 if (ret)
4270 *ppos = pos;
4271 return ret;
4272 }
4273
4274 static struct addrconf_sysctl_table
4275 {
4276 struct ctl_table_header *sysctl_header;
4277 ctl_table addrconf_vars[DEVCONF_MAX+1];
4278 char *dev_name;
4279 } addrconf_sysctl __read_mostly = {
4280 .sysctl_header = NULL,
4281 .addrconf_vars = {
4282 {
4283 .procname = "forwarding",
4284 .data = &ipv6_devconf.forwarding,
4285 .maxlen = sizeof(int),
4286 .mode = 0644,
4287 .proc_handler = addrconf_sysctl_forward,
4288 },
4289 {
4290 .procname = "hop_limit",
4291 .data = &ipv6_devconf.hop_limit,
4292 .maxlen = sizeof(int),
4293 .mode = 0644,
4294 .proc_handler = proc_dointvec,
4295 },
4296 {
4297 .procname = "mtu",
4298 .data = &ipv6_devconf.mtu6,
4299 .maxlen = sizeof(int),
4300 .mode = 0644,
4301 .proc_handler = proc_dointvec,
4302 },
4303 {
4304 .procname = "accept_ra",
4305 .data = &ipv6_devconf.accept_ra,
4306 .maxlen = sizeof(int),
4307 .mode = 0644,
4308 .proc_handler = proc_dointvec,
4309 },
4310 {
4311 .procname = "accept_redirects",
4312 .data = &ipv6_devconf.accept_redirects,
4313 .maxlen = sizeof(int),
4314 .mode = 0644,
4315 .proc_handler = proc_dointvec,
4316 },
4317 {
4318 .procname = "autoconf",
4319 .data = &ipv6_devconf.autoconf,
4320 .maxlen = sizeof(int),
4321 .mode = 0644,
4322 .proc_handler = proc_dointvec,
4323 },
4324 {
4325 .procname = "dad_transmits",
4326 .data = &ipv6_devconf.dad_transmits,
4327 .maxlen = sizeof(int),
4328 .mode = 0644,
4329 .proc_handler = proc_dointvec,
4330 },
4331 {
4332 .procname = "router_solicitations",
4333 .data = &ipv6_devconf.rtr_solicits,
4334 .maxlen = sizeof(int),
4335 .mode = 0644,
4336 .proc_handler = proc_dointvec,
4337 },
4338 {
4339 .procname = "router_solicitation_interval",
4340 .data = &ipv6_devconf.rtr_solicit_interval,
4341 .maxlen = sizeof(int),
4342 .mode = 0644,
4343 .proc_handler = proc_dointvec_jiffies,
4344 },
4345 {
4346 .procname = "router_solicitation_delay",
4347 .data = &ipv6_devconf.rtr_solicit_delay,
4348 .maxlen = sizeof(int),
4349 .mode = 0644,
4350 .proc_handler = proc_dointvec_jiffies,
4351 },
4352 {
4353 .procname = "force_mld_version",
4354 .data = &ipv6_devconf.force_mld_version,
4355 .maxlen = sizeof(int),
4356 .mode = 0644,
4357 .proc_handler = proc_dointvec,
4358 },
4359 #ifdef CONFIG_IPV6_PRIVACY
4360 {
4361 .procname = "use_tempaddr",
4362 .data = &ipv6_devconf.use_tempaddr,
4363 .maxlen = sizeof(int),
4364 .mode = 0644,
4365 .proc_handler = proc_dointvec,
4366 },
4367 {
4368 .procname = "temp_valid_lft",
4369 .data = &ipv6_devconf.temp_valid_lft,
4370 .maxlen = sizeof(int),
4371 .mode = 0644,
4372 .proc_handler = proc_dointvec,
4373 },
4374 {
4375 .procname = "temp_prefered_lft",
4376 .data = &ipv6_devconf.temp_prefered_lft,
4377 .maxlen = sizeof(int),
4378 .mode = 0644,
4379 .proc_handler = proc_dointvec,
4380 },
4381 {
4382 .procname = "regen_max_retry",
4383 .data = &ipv6_devconf.regen_max_retry,
4384 .maxlen = sizeof(int),
4385 .mode = 0644,
4386 .proc_handler = proc_dointvec,
4387 },
4388 {
4389 .procname = "max_desync_factor",
4390 .data = &ipv6_devconf.max_desync_factor,
4391 .maxlen = sizeof(int),
4392 .mode = 0644,
4393 .proc_handler = proc_dointvec,
4394 },
4395 #endif
4396 {
4397 .procname = "max_addresses",
4398 .data = &ipv6_devconf.max_addresses,
4399 .maxlen = sizeof(int),
4400 .mode = 0644,
4401 .proc_handler = proc_dointvec,
4402 },
4403 {
4404 .procname = "accept_ra_defrtr",
4405 .data = &ipv6_devconf.accept_ra_defrtr,
4406 .maxlen = sizeof(int),
4407 .mode = 0644,
4408 .proc_handler = proc_dointvec,
4409 },
4410 {
4411 .procname = "accept_ra_pinfo",
4412 .data = &ipv6_devconf.accept_ra_pinfo,
4413 .maxlen = sizeof(int),
4414 .mode = 0644,
4415 .proc_handler = proc_dointvec,
4416 },
4417 #ifdef CONFIG_IPV6_ROUTER_PREF
4418 {
4419 .procname = "accept_ra_rtr_pref",
4420 .data = &ipv6_devconf.accept_ra_rtr_pref,
4421 .maxlen = sizeof(int),
4422 .mode = 0644,
4423 .proc_handler = proc_dointvec,
4424 },
4425 {
4426 .procname = "router_probe_interval",
4427 .data = &ipv6_devconf.rtr_probe_interval,
4428 .maxlen = sizeof(int),
4429 .mode = 0644,
4430 .proc_handler = proc_dointvec_jiffies,
4431 },
4432 #ifdef CONFIG_IPV6_ROUTE_INFO
4433 {
4434 .procname = "accept_ra_rt_info_max_plen",
4435 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4436 .maxlen = sizeof(int),
4437 .mode = 0644,
4438 .proc_handler = proc_dointvec,
4439 },
4440 #endif
4441 #endif
4442 {
4443 .procname = "proxy_ndp",
4444 .data = &ipv6_devconf.proxy_ndp,
4445 .maxlen = sizeof(int),
4446 .mode = 0644,
4447 .proc_handler = proc_dointvec,
4448 },
4449 {
4450 .procname = "accept_source_route",
4451 .data = &ipv6_devconf.accept_source_route,
4452 .maxlen = sizeof(int),
4453 .mode = 0644,
4454 .proc_handler = proc_dointvec,
4455 },
4456 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4457 {
4458 .procname = "optimistic_dad",
4459 .data = &ipv6_devconf.optimistic_dad,
4460 .maxlen = sizeof(int),
4461 .mode = 0644,
4462 .proc_handler = proc_dointvec,
4463
4464 },
4465 #endif
4466 #ifdef CONFIG_IPV6_MROUTE
4467 {
4468 .procname = "mc_forwarding",
4469 .data = &ipv6_devconf.mc_forwarding,
4470 .maxlen = sizeof(int),
4471 .mode = 0444,
4472 .proc_handler = proc_dointvec,
4473 },
4474 #endif
4475 {
4476 .procname = "disable_ipv6",
4477 .data = &ipv6_devconf.disable_ipv6,
4478 .maxlen = sizeof(int),
4479 .mode = 0644,
4480 .proc_handler = addrconf_sysctl_disable,
4481 },
4482 {
4483 .procname = "accept_dad",
4484 .data = &ipv6_devconf.accept_dad,
4485 .maxlen = sizeof(int),
4486 .mode = 0644,
4487 .proc_handler = proc_dointvec,
4488 },
4489 {
4490 .procname = "force_tllao",
4491 .data = &ipv6_devconf.force_tllao,
4492 .maxlen = sizeof(int),
4493 .mode = 0644,
4494 .proc_handler = proc_dointvec
4495 },
4496 {
4497 /* sentinel */
4498 }
4499 },
4500 };
4501
4502 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4503 struct inet6_dev *idev, struct ipv6_devconf *p)
4504 {
4505 int i;
4506 struct addrconf_sysctl_table *t;
4507
4508 #define ADDRCONF_CTL_PATH_DEV 3
4509
4510 struct ctl_path addrconf_ctl_path[] = {
4511 { .procname = "net", },
4512 { .procname = "ipv6", },
4513 { .procname = "conf", },
4514 { /* to be set */ },
4515 { },
4516 };
4517
4518
4519 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4520 if (t == NULL)
4521 goto out;
4522
4523 for (i = 0; t->addrconf_vars[i].data; i++) {
4524 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
4525 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4526 t->addrconf_vars[i].extra2 = net;
4527 }
4528
4529 /*
4530 * Make a copy of dev_name, because '.procname' is regarded as const
4531 * by sysctl and we wouldn't want anyone to change it under our feet
4532 * (see SIOCSIFNAME).
4533 */
4534 t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4535 if (!t->dev_name)
4536 goto free;
4537
4538 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
4539
4540 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
4541 t->addrconf_vars);
4542 if (t->sysctl_header == NULL)
4543 goto free_procname;
4544
4545 p->sysctl = t;
4546 return 0;
4547
4548 free_procname:
4549 kfree(t->dev_name);
4550 free:
4551 kfree(t);
4552 out:
4553 return -ENOBUFS;
4554 }
4555
4556 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4557 {
4558 struct addrconf_sysctl_table *t;
4559
4560 if (p->sysctl == NULL)
4561 return;
4562
4563 t = p->sysctl;
4564 p->sysctl = NULL;
4565 unregister_net_sysctl_table(t->sysctl_header);
4566 kfree(t->dev_name);
4567 kfree(t);
4568 }
4569
4570 static void addrconf_sysctl_register(struct inet6_dev *idev)
4571 {
4572 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
4573 &ndisc_ifinfo_sysctl_change);
4574 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
4575 idev, &idev->cnf);
4576 }
4577
4578 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
4579 {
4580 __addrconf_sysctl_unregister(&idev->cnf);
4581 neigh_sysctl_unregister(idev->nd_parms);
4582 }
4583
4584
4585 #endif
4586
4587 static int __net_init addrconf_init_net(struct net *net)
4588 {
4589 int err;
4590 struct ipv6_devconf *all, *dflt;
4591
4592 err = -ENOMEM;
4593 all = &ipv6_devconf;
4594 dflt = &ipv6_devconf_dflt;
4595
4596 if (!net_eq(net, &init_net)) {
4597 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4598 if (all == NULL)
4599 goto err_alloc_all;
4600
4601 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4602 if (dflt == NULL)
4603 goto err_alloc_dflt;
4604 } else {
4605 /* these will be inherited by all namespaces */
4606 dflt->autoconf = ipv6_defaults.autoconf;
4607 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
4608 }
4609
4610 net->ipv6.devconf_all = all;
4611 net->ipv6.devconf_dflt = dflt;
4612
4613 #ifdef CONFIG_SYSCTL
4614 err = __addrconf_sysctl_register(net, "all", NULL, all);
4615 if (err < 0)
4616 goto err_reg_all;
4617
4618 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
4619 if (err < 0)
4620 goto err_reg_dflt;
4621 #endif
4622 return 0;
4623
4624 #ifdef CONFIG_SYSCTL
4625 err_reg_dflt:
4626 __addrconf_sysctl_unregister(all);
4627 err_reg_all:
4628 kfree(dflt);
4629 #endif
4630 err_alloc_dflt:
4631 kfree(all);
4632 err_alloc_all:
4633 return err;
4634 }
4635
4636 static void __net_exit addrconf_exit_net(struct net *net)
4637 {
4638 #ifdef CONFIG_SYSCTL
4639 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4640 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4641 #endif
4642 if (!net_eq(net, &init_net)) {
4643 kfree(net->ipv6.devconf_dflt);
4644 kfree(net->ipv6.devconf_all);
4645 }
4646 }
4647
4648 static struct pernet_operations addrconf_ops = {
4649 .init = addrconf_init_net,
4650 .exit = addrconf_exit_net,
4651 };
4652
4653 /*
4654 * Device notifier
4655 */
4656
4657 int register_inet6addr_notifier(struct notifier_block *nb)
4658 {
4659 return atomic_notifier_chain_register(&inet6addr_chain, nb);
4660 }
4661 EXPORT_SYMBOL(register_inet6addr_notifier);
4662
4663 int unregister_inet6addr_notifier(struct notifier_block *nb)
4664 {
4665 return atomic_notifier_chain_unregister(&inet6addr_chain, nb);
4666 }
4667 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4668
4669 static struct rtnl_af_ops inet6_ops = {
4670 .family = AF_INET6,
4671 .fill_link_af = inet6_fill_link_af,
4672 .get_link_af_size = inet6_get_link_af_size,
4673 };
4674
4675 /*
4676 * Init / cleanup code
4677 */
4678
4679 int __init addrconf_init(void)
4680 {
4681 int i, err;
4682
4683 err = ipv6_addr_label_init();
4684 if (err < 0) {
4685 printk(KERN_CRIT "IPv6 Addrconf:"
4686 " cannot initialize default policy table: %d.\n", err);
4687 goto out;
4688 }
4689
4690 err = register_pernet_subsys(&addrconf_ops);
4691 if (err < 0)
4692 goto out_addrlabel;
4693
4694 /* The addrconf netdev notifier requires that loopback_dev
4695 * has it's ipv6 private information allocated and setup
4696 * before it can bring up and give link-local addresses
4697 * to other devices which are up.
4698 *
4699 * Unfortunately, loopback_dev is not necessarily the first
4700 * entry in the global dev_base list of net devices. In fact,
4701 * it is likely to be the very last entry on that list.
4702 * So this causes the notifier registry below to try and
4703 * give link-local addresses to all devices besides loopback_dev
4704 * first, then loopback_dev, which cases all the non-loopback_dev
4705 * devices to fail to get a link-local address.
4706 *
4707 * So, as a temporary fix, allocate the ipv6 structure for
4708 * loopback_dev first by hand.
4709 * Longer term, all of the dependencies ipv6 has upon the loopback
4710 * device and it being up should be removed.
4711 */
4712 rtnl_lock();
4713 if (!ipv6_add_dev(init_net.loopback_dev))
4714 err = -ENOMEM;
4715 rtnl_unlock();
4716 if (err)
4717 goto errlo;
4718
4719 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4720 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
4721
4722 register_netdevice_notifier(&ipv6_dev_notf);
4723
4724 addrconf_verify(0);
4725
4726 err = rtnl_af_register(&inet6_ops);
4727 if (err < 0)
4728 goto errout_af;
4729
4730 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4731 if (err < 0)
4732 goto errout;
4733
4734 /* Only the first call to __rtnl_register can fail */
4735 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4736 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4737 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4738 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4739 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4740
4741 ipv6_addr_label_rtnl_register();
4742
4743 return 0;
4744 errout:
4745 rtnl_af_unregister(&inet6_ops);
4746 errout_af:
4747 unregister_netdevice_notifier(&ipv6_dev_notf);
4748 errlo:
4749 unregister_pernet_subsys(&addrconf_ops);
4750 out_addrlabel:
4751 ipv6_addr_label_cleanup();
4752 out:
4753 return err;
4754 }
4755
4756 void addrconf_cleanup(void)
4757 {
4758 struct net_device *dev;
4759 int i;
4760
4761 unregister_netdevice_notifier(&ipv6_dev_notf);
4762 unregister_pernet_subsys(&addrconf_ops);
4763 ipv6_addr_label_cleanup();
4764
4765 rtnl_lock();
4766
4767 __rtnl_af_unregister(&inet6_ops);
4768
4769 /* clean dev list */
4770 for_each_netdev(&init_net, dev) {
4771 if (__in6_dev_get(dev) == NULL)
4772 continue;
4773 addrconf_ifdown(dev, 1);
4774 }
4775 addrconf_ifdown(init_net.loopback_dev, 2);
4776
4777 /*
4778 * Check hash table.
4779 */
4780 spin_lock_bh(&addrconf_hash_lock);
4781 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4782 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
4783 spin_unlock_bh(&addrconf_hash_lock);
4784
4785 del_timer(&addr_chk_timer);
4786 rtnl_unlock();
4787 }
Linux kernel - Deliverables
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