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net: remove k{un}map_skb_frag()
[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 #include <linux/export.h>
91
92 /* Set to 3 to get tracing... */
93 #define ACONF_DEBUG 2
94
95 #if ACONF_DEBUG >= 3
96 #define ADBG(x) printk x
97 #else
98 #define ADBG(x)
99 #endif
100
101 #define INFINITY_LIFE_TIME 0xFFFFFFFF
102
103 static inline u32 cstamp_delta(unsigned long cstamp)
104 {
105 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
106 }
107
108 #define ADDRCONF_TIMER_FUZZ_MINUS (HZ > 50 ? HZ/50 : 1)
109 #define ADDRCONF_TIMER_FUZZ (HZ / 4)
110 #define ADDRCONF_TIMER_FUZZ_MAX (HZ)
111
112 #ifdef CONFIG_SYSCTL
113 static void addrconf_sysctl_register(struct inet6_dev *idev);
114 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
115 #else
116 static inline void addrconf_sysctl_register(struct inet6_dev *idev)
117 {
118 }
119
120 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
121 {
122 }
123 #endif
124
125 #ifdef CONFIG_IPV6_PRIVACY
126 static int __ipv6_regen_rndid(struct inet6_dev *idev);
127 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
128 static void ipv6_regen_rndid(unsigned long data);
129 #endif
130
131 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
132 static int ipv6_count_addresses(struct inet6_dev *idev);
133
134 /*
135 * Configured unicast address hash table
136 */
137 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
138 static DEFINE_SPINLOCK(addrconf_hash_lock);
139
140 static void addrconf_verify(unsigned long);
141
142 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
143 static DEFINE_SPINLOCK(addrconf_verify_lock);
144
145 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
146 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
147
148 static void addrconf_type_change(struct net_device *dev,
149 unsigned long event);
150 static int addrconf_ifdown(struct net_device *dev, int how);
151
152 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
153 static void addrconf_dad_timer(unsigned long data);
154 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
155 static void addrconf_dad_run(struct inet6_dev *idev);
156 static void addrconf_rs_timer(unsigned long data);
157 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
158 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
159
160 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
161 struct prefix_info *pinfo);
162 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
163 struct net_device *dev);
164
165 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
166
167 static struct ipv6_devconf ipv6_devconf __read_mostly = {
168 .forwarding = 0,
169 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
170 .mtu6 = IPV6_MIN_MTU,
171 .accept_ra = 1,
172 .accept_redirects = 1,
173 .autoconf = 1,
174 .force_mld_version = 0,
175 .dad_transmits = 1,
176 .rtr_solicits = MAX_RTR_SOLICITATIONS,
177 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
178 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
179 #ifdef CONFIG_IPV6_PRIVACY
180 .use_tempaddr = 0,
181 .temp_valid_lft = TEMP_VALID_LIFETIME,
182 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
183 .regen_max_retry = REGEN_MAX_RETRY,
184 .max_desync_factor = MAX_DESYNC_FACTOR,
185 #endif
186 .max_addresses = IPV6_MAX_ADDRESSES,
187 .accept_ra_defrtr = 1,
188 .accept_ra_pinfo = 1,
189 #ifdef CONFIG_IPV6_ROUTER_PREF
190 .accept_ra_rtr_pref = 1,
191 .rtr_probe_interval = 60 * HZ,
192 #ifdef CONFIG_IPV6_ROUTE_INFO
193 .accept_ra_rt_info_max_plen = 0,
194 #endif
195 #endif
196 .proxy_ndp = 0,
197 .accept_source_route = 0, /* we do not accept RH0 by default. */
198 .disable_ipv6 = 0,
199 .accept_dad = 1,
200 };
201
202 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
203 .forwarding = 0,
204 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
205 .mtu6 = IPV6_MIN_MTU,
206 .accept_ra = 1,
207 .accept_redirects = 1,
208 .autoconf = 1,
209 .dad_transmits = 1,
210 .rtr_solicits = MAX_RTR_SOLICITATIONS,
211 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
212 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
213 #ifdef CONFIG_IPV6_PRIVACY
214 .use_tempaddr = 0,
215 .temp_valid_lft = TEMP_VALID_LIFETIME,
216 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
217 .regen_max_retry = REGEN_MAX_RETRY,
218 .max_desync_factor = MAX_DESYNC_FACTOR,
219 #endif
220 .max_addresses = IPV6_MAX_ADDRESSES,
221 .accept_ra_defrtr = 1,
222 .accept_ra_pinfo = 1,
223 #ifdef CONFIG_IPV6_ROUTER_PREF
224 .accept_ra_rtr_pref = 1,
225 .rtr_probe_interval = 60 * HZ,
226 #ifdef CONFIG_IPV6_ROUTE_INFO
227 .accept_ra_rt_info_max_plen = 0,
228 #endif
229 #endif
230 .proxy_ndp = 0,
231 .accept_source_route = 0, /* we do not accept RH0 by default. */
232 .disable_ipv6 = 0,
233 .accept_dad = 1,
234 };
235
236 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
237 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
238 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
239 const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
240 const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
241
242 /* Check if a valid qdisc is available */
243 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
244 {
245 return !qdisc_tx_is_noop(dev);
246 }
247
248 /* Check if a route is valid prefix route */
249 static inline int addrconf_is_prefix_route(const struct rt6_info *rt)
250 {
251 return (rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0;
252 }
253
254 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
255 {
256 if (del_timer(&ifp->timer))
257 __in6_ifa_put(ifp);
258 }
259
260 enum addrconf_timer_t {
261 AC_NONE,
262 AC_DAD,
263 AC_RS,
264 };
265
266 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
267 enum addrconf_timer_t what,
268 unsigned long when)
269 {
270 if (!del_timer(&ifp->timer))
271 in6_ifa_hold(ifp);
272
273 switch (what) {
274 case AC_DAD:
275 ifp->timer.function = addrconf_dad_timer;
276 break;
277 case AC_RS:
278 ifp->timer.function = addrconf_rs_timer;
279 break;
280 default:
281 break;
282 }
283 ifp->timer.expires = jiffies + when;
284 add_timer(&ifp->timer);
285 }
286
287 static int snmp6_alloc_dev(struct inet6_dev *idev)
288 {
289 if (snmp_mib_init((void __percpu **)idev->stats.ipv6,
290 sizeof(struct ipstats_mib),
291 __alignof__(struct ipstats_mib)) < 0)
292 goto err_ip;
293 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
294 GFP_KERNEL);
295 if (!idev->stats.icmpv6dev)
296 goto err_icmp;
297 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
298 GFP_KERNEL);
299 if (!idev->stats.icmpv6msgdev)
300 goto err_icmpmsg;
301
302 return 0;
303
304 err_icmpmsg:
305 kfree(idev->stats.icmpv6dev);
306 err_icmp:
307 snmp_mib_free((void __percpu **)idev->stats.ipv6);
308 err_ip:
309 return -ENOMEM;
310 }
311
312 static void snmp6_free_dev(struct inet6_dev *idev)
313 {
314 kfree(idev->stats.icmpv6msgdev);
315 kfree(idev->stats.icmpv6dev);
316 snmp_mib_free((void __percpu **)idev->stats.ipv6);
317 }
318
319 /* Nobody refers to this device, we may destroy it. */
320
321 void in6_dev_finish_destroy(struct inet6_dev *idev)
322 {
323 struct net_device *dev = idev->dev;
324
325 WARN_ON(!list_empty(&idev->addr_list));
326 WARN_ON(idev->mc_list != NULL);
327
328 #ifdef NET_REFCNT_DEBUG
329 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
330 #endif
331 dev_put(dev);
332 if (!idev->dead) {
333 pr_warning("Freeing alive inet6 device %p\n", idev);
334 return;
335 }
336 snmp6_free_dev(idev);
337 kfree_rcu(idev, rcu);
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 dev_put(dev);
378 kfree(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 /* Join all-router multicast group if forwarding is set */
437 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
438 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
439
440 return ndev;
441 }
442
443 static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
444 {
445 struct inet6_dev *idev;
446
447 ASSERT_RTNL();
448
449 idev = __in6_dev_get(dev);
450 if (!idev) {
451 idev = ipv6_add_dev(dev);
452 if (!idev)
453 return NULL;
454 }
455
456 if (dev->flags&IFF_UP)
457 ipv6_mc_up(idev);
458 return idev;
459 }
460
461 #ifdef CONFIG_SYSCTL
462 static void dev_forward_change(struct inet6_dev *idev)
463 {
464 struct net_device *dev;
465 struct inet6_ifaddr *ifa;
466
467 if (!idev)
468 return;
469 dev = idev->dev;
470 if (idev->cnf.forwarding)
471 dev_disable_lro(dev);
472 if (dev && (dev->flags & IFF_MULTICAST)) {
473 if (idev->cnf.forwarding)
474 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
475 else
476 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
477 }
478
479 list_for_each_entry(ifa, &idev->addr_list, if_list) {
480 if (ifa->flags&IFA_F_TENTATIVE)
481 continue;
482 if (idev->cnf.forwarding)
483 addrconf_join_anycast(ifa);
484 else
485 addrconf_leave_anycast(ifa);
486 }
487 }
488
489
490 static void addrconf_forward_change(struct net *net, __s32 newf)
491 {
492 struct net_device *dev;
493 struct inet6_dev *idev;
494
495 rcu_read_lock();
496 for_each_netdev_rcu(net, dev) {
497 idev = __in6_dev_get(dev);
498 if (idev) {
499 int changed = (!idev->cnf.forwarding) ^ (!newf);
500 idev->cnf.forwarding = newf;
501 if (changed)
502 dev_forward_change(idev);
503 }
504 }
505 rcu_read_unlock();
506 }
507
508 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
509 {
510 struct net *net;
511 int old;
512
513 if (!rtnl_trylock())
514 return restart_syscall();
515
516 net = (struct net *)table->extra2;
517 old = *p;
518 *p = newf;
519
520 if (p == &net->ipv6.devconf_dflt->forwarding) {
521 rtnl_unlock();
522 return 0;
523 }
524
525 if (p == &net->ipv6.devconf_all->forwarding) {
526 net->ipv6.devconf_dflt->forwarding = newf;
527 addrconf_forward_change(net, newf);
528 } else if ((!newf) ^ (!old))
529 dev_forward_change((struct inet6_dev *)table->extra1);
530 rtnl_unlock();
531
532 if (newf)
533 rt6_purge_dflt_routers(net);
534 return 1;
535 }
536 #endif
537
538 /* Nobody refers to this ifaddr, destroy it */
539 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
540 {
541 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
542
543 #ifdef NET_REFCNT_DEBUG
544 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
545 #endif
546
547 in6_dev_put(ifp->idev);
548
549 if (del_timer(&ifp->timer))
550 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp);
551
552 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
553 pr_warning("Freeing alive inet6 address %p\n", ifp);
554 return;
555 }
556 dst_release(&ifp->rt->dst);
557
558 kfree_rcu(ifp, rcu);
559 }
560
561 static void
562 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
563 {
564 struct list_head *p;
565 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
566
567 /*
568 * Each device address list is sorted in order of scope -
569 * global before linklocal.
570 */
571 list_for_each(p, &idev->addr_list) {
572 struct inet6_ifaddr *ifa
573 = list_entry(p, struct inet6_ifaddr, if_list);
574 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
575 break;
576 }
577
578 list_add_tail(&ifp->if_list, p);
579 }
580
581 static u32 ipv6_addr_hash(const struct in6_addr *addr)
582 {
583 /*
584 * We perform the hash function over the last 64 bits of the address
585 * This will include the IEEE address token on links that support it.
586 */
587 return jhash_2words((__force u32)addr->s6_addr32[2],
588 (__force u32)addr->s6_addr32[3], 0)
589 & (IN6_ADDR_HSIZE - 1);
590 }
591
592 /* On success it returns ifp with increased reference count */
593
594 static struct inet6_ifaddr *
595 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
596 int scope, u32 flags)
597 {
598 struct inet6_ifaddr *ifa = NULL;
599 struct rt6_info *rt;
600 unsigned int hash;
601 int err = 0;
602 int addr_type = ipv6_addr_type(addr);
603
604 if (addr_type == IPV6_ADDR_ANY ||
605 addr_type & IPV6_ADDR_MULTICAST ||
606 (!(idev->dev->flags & IFF_LOOPBACK) &&
607 addr_type & IPV6_ADDR_LOOPBACK))
608 return ERR_PTR(-EADDRNOTAVAIL);
609
610 rcu_read_lock_bh();
611 if (idev->dead) {
612 err = -ENODEV; /*XXX*/
613 goto out2;
614 }
615
616 if (idev->cnf.disable_ipv6) {
617 err = -EACCES;
618 goto out2;
619 }
620
621 spin_lock(&addrconf_hash_lock);
622
623 /* Ignore adding duplicate addresses on an interface */
624 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
625 ADBG(("ipv6_add_addr: already assigned\n"));
626 err = -EEXIST;
627 goto out;
628 }
629
630 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
631
632 if (ifa == NULL) {
633 ADBG(("ipv6_add_addr: malloc failed\n"));
634 err = -ENOBUFS;
635 goto out;
636 }
637
638 rt = addrconf_dst_alloc(idev, addr, false);
639 if (IS_ERR(rt)) {
640 err = PTR_ERR(rt);
641 goto out;
642 }
643
644 ifa->addr = *addr;
645
646 spin_lock_init(&ifa->lock);
647 spin_lock_init(&ifa->state_lock);
648 init_timer(&ifa->timer);
649 INIT_HLIST_NODE(&ifa->addr_lst);
650 ifa->timer.data = (unsigned long) ifa;
651 ifa->scope = scope;
652 ifa->prefix_len = pfxlen;
653 ifa->flags = flags | IFA_F_TENTATIVE;
654 ifa->cstamp = ifa->tstamp = jiffies;
655
656 ifa->rt = rt;
657
658 ifa->idev = idev;
659 in6_dev_hold(idev);
660 /* For caller */
661 in6_ifa_hold(ifa);
662
663 /* Add to big hash table */
664 hash = ipv6_addr_hash(addr);
665
666 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
667 spin_unlock(&addrconf_hash_lock);
668
669 write_lock(&idev->lock);
670 /* Add to inet6_dev unicast addr list. */
671 ipv6_link_dev_addr(idev, ifa);
672
673 #ifdef CONFIG_IPV6_PRIVACY
674 if (ifa->flags&IFA_F_TEMPORARY) {
675 list_add(&ifa->tmp_list, &idev->tempaddr_list);
676 in6_ifa_hold(ifa);
677 }
678 #endif
679
680 in6_ifa_hold(ifa);
681 write_unlock(&idev->lock);
682 out2:
683 rcu_read_unlock_bh();
684
685 if (likely(err == 0))
686 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
687 else {
688 kfree(ifa);
689 ifa = ERR_PTR(err);
690 }
691
692 return ifa;
693 out:
694 spin_unlock(&addrconf_hash_lock);
695 goto out2;
696 }
697
698 /* This function wants to get referenced ifp and releases it before return */
699
700 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
701 {
702 struct inet6_ifaddr *ifa, *ifn;
703 struct inet6_dev *idev = ifp->idev;
704 int state;
705 int deleted = 0, onlink = 0;
706 unsigned long expires = jiffies;
707
708 spin_lock_bh(&ifp->state_lock);
709 state = ifp->state;
710 ifp->state = INET6_IFADDR_STATE_DEAD;
711 spin_unlock_bh(&ifp->state_lock);
712
713 if (state == INET6_IFADDR_STATE_DEAD)
714 goto out;
715
716 spin_lock_bh(&addrconf_hash_lock);
717 hlist_del_init_rcu(&ifp->addr_lst);
718 spin_unlock_bh(&addrconf_hash_lock);
719
720 write_lock_bh(&idev->lock);
721 #ifdef CONFIG_IPV6_PRIVACY
722 if (ifp->flags&IFA_F_TEMPORARY) {
723 list_del(&ifp->tmp_list);
724 if (ifp->ifpub) {
725 in6_ifa_put(ifp->ifpub);
726 ifp->ifpub = NULL;
727 }
728 __in6_ifa_put(ifp);
729 }
730 #endif
731
732 list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) {
733 if (ifa == ifp) {
734 list_del_init(&ifp->if_list);
735 __in6_ifa_put(ifp);
736
737 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
738 break;
739 deleted = 1;
740 continue;
741 } else if (ifp->flags & IFA_F_PERMANENT) {
742 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
743 ifp->prefix_len)) {
744 if (ifa->flags & IFA_F_PERMANENT) {
745 onlink = 1;
746 if (deleted)
747 break;
748 } else {
749 unsigned long lifetime;
750
751 if (!onlink)
752 onlink = -1;
753
754 spin_lock(&ifa->lock);
755
756 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
757 /*
758 * Note: Because this address is
759 * not permanent, lifetime <
760 * LONG_MAX / HZ here.
761 */
762 if (time_before(expires,
763 ifa->tstamp + lifetime * HZ))
764 expires = ifa->tstamp + lifetime * HZ;
765 spin_unlock(&ifa->lock);
766 }
767 }
768 }
769 }
770 write_unlock_bh(&idev->lock);
771
772 addrconf_del_timer(ifp);
773
774 ipv6_ifa_notify(RTM_DELADDR, ifp);
775
776 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
777
778 /*
779 * Purge or update corresponding prefix
780 *
781 * 1) we don't purge prefix here if address was not permanent.
782 * prefix is managed by its own lifetime.
783 * 2) if there're no addresses, delete prefix.
784 * 3) if there're still other permanent address(es),
785 * corresponding prefix is still permanent.
786 * 4) otherwise, update prefix lifetime to the
787 * longest valid lifetime among the corresponding
788 * addresses on the device.
789 * Note: subsequent RA will update lifetime.
790 *
791 * --yoshfuji
792 */
793 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
794 struct in6_addr prefix;
795 struct rt6_info *rt;
796 struct net *net = dev_net(ifp->idev->dev);
797 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
798 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1);
799
800 if (rt && addrconf_is_prefix_route(rt)) {
801 if (onlink == 0) {
802 ip6_del_rt(rt);
803 rt = NULL;
804 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
805 rt->dst.expires = expires;
806 rt->rt6i_flags |= RTF_EXPIRES;
807 }
808 }
809 dst_release(&rt->dst);
810 }
811
812 /* clean up prefsrc entries */
813 rt6_remove_prefsrc(ifp);
814 out:
815 in6_ifa_put(ifp);
816 }
817
818 #ifdef CONFIG_IPV6_PRIVACY
819 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
820 {
821 struct inet6_dev *idev = ifp->idev;
822 struct in6_addr addr, *tmpaddr;
823 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
824 unsigned long regen_advance;
825 int tmp_plen;
826 int ret = 0;
827 int max_addresses;
828 u32 addr_flags;
829 unsigned long now = jiffies;
830
831 write_lock(&idev->lock);
832 if (ift) {
833 spin_lock_bh(&ift->lock);
834 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
835 spin_unlock_bh(&ift->lock);
836 tmpaddr = &addr;
837 } else {
838 tmpaddr = NULL;
839 }
840 retry:
841 in6_dev_hold(idev);
842 if (idev->cnf.use_tempaddr <= 0) {
843 write_unlock(&idev->lock);
844 printk(KERN_INFO
845 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
846 in6_dev_put(idev);
847 ret = -1;
848 goto out;
849 }
850 spin_lock_bh(&ifp->lock);
851 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
852 idev->cnf.use_tempaddr = -1; /*XXX*/
853 spin_unlock_bh(&ifp->lock);
854 write_unlock(&idev->lock);
855 printk(KERN_WARNING
856 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
857 in6_dev_put(idev);
858 ret = -1;
859 goto out;
860 }
861 in6_ifa_hold(ifp);
862 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
863 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
864 spin_unlock_bh(&ifp->lock);
865 write_unlock(&idev->lock);
866 printk(KERN_WARNING
867 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
868 in6_ifa_put(ifp);
869 in6_dev_put(idev);
870 ret = -1;
871 goto out;
872 }
873 memcpy(&addr.s6_addr[8], idev->rndid, 8);
874 age = (now - ifp->tstamp) / HZ;
875 tmp_valid_lft = min_t(__u32,
876 ifp->valid_lft,
877 idev->cnf.temp_valid_lft + age);
878 tmp_prefered_lft = min_t(__u32,
879 ifp->prefered_lft,
880 idev->cnf.temp_prefered_lft + age -
881 idev->cnf.max_desync_factor);
882 tmp_plen = ifp->prefix_len;
883 max_addresses = idev->cnf.max_addresses;
884 tmp_tstamp = ifp->tstamp;
885 spin_unlock_bh(&ifp->lock);
886
887 regen_advance = idev->cnf.regen_max_retry *
888 idev->cnf.dad_transmits *
889 idev->nd_parms->retrans_time / HZ;
890 write_unlock(&idev->lock);
891
892 /* A temporary address is created only if this calculated Preferred
893 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
894 * an implementation must not create a temporary address with a zero
895 * Preferred Lifetime.
896 */
897 if (tmp_prefered_lft <= regen_advance) {
898 in6_ifa_put(ifp);
899 in6_dev_put(idev);
900 ret = -1;
901 goto out;
902 }
903
904 addr_flags = IFA_F_TEMPORARY;
905 /* set in addrconf_prefix_rcv() */
906 if (ifp->flags & IFA_F_OPTIMISTIC)
907 addr_flags |= IFA_F_OPTIMISTIC;
908
909 ift = !max_addresses ||
910 ipv6_count_addresses(idev) < max_addresses ?
911 ipv6_add_addr(idev, &addr, tmp_plen,
912 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
913 addr_flags) : NULL;
914 if (!ift || IS_ERR(ift)) {
915 in6_ifa_put(ifp);
916 in6_dev_put(idev);
917 printk(KERN_INFO
918 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
919 tmpaddr = &addr;
920 write_lock(&idev->lock);
921 goto retry;
922 }
923
924 spin_lock_bh(&ift->lock);
925 ift->ifpub = ifp;
926 ift->valid_lft = tmp_valid_lft;
927 ift->prefered_lft = tmp_prefered_lft;
928 ift->cstamp = now;
929 ift->tstamp = tmp_tstamp;
930 spin_unlock_bh(&ift->lock);
931
932 addrconf_dad_start(ift, 0);
933 in6_ifa_put(ift);
934 in6_dev_put(idev);
935 out:
936 return ret;
937 }
938 #endif
939
940 /*
941 * Choose an appropriate source address (RFC3484)
942 */
943 enum {
944 IPV6_SADDR_RULE_INIT = 0,
945 IPV6_SADDR_RULE_LOCAL,
946 IPV6_SADDR_RULE_SCOPE,
947 IPV6_SADDR_RULE_PREFERRED,
948 #ifdef CONFIG_IPV6_MIP6
949 IPV6_SADDR_RULE_HOA,
950 #endif
951 IPV6_SADDR_RULE_OIF,
952 IPV6_SADDR_RULE_LABEL,
953 #ifdef CONFIG_IPV6_PRIVACY
954 IPV6_SADDR_RULE_PRIVACY,
955 #endif
956 IPV6_SADDR_RULE_ORCHID,
957 IPV6_SADDR_RULE_PREFIX,
958 IPV6_SADDR_RULE_MAX
959 };
960
961 struct ipv6_saddr_score {
962 int rule;
963 int addr_type;
964 struct inet6_ifaddr *ifa;
965 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
966 int scopedist;
967 int matchlen;
968 };
969
970 struct ipv6_saddr_dst {
971 const struct in6_addr *addr;
972 int ifindex;
973 int scope;
974 int label;
975 unsigned int prefs;
976 };
977
978 static inline int ipv6_saddr_preferred(int type)
979 {
980 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
981 return 1;
982 return 0;
983 }
984
985 static int ipv6_get_saddr_eval(struct net *net,
986 struct ipv6_saddr_score *score,
987 struct ipv6_saddr_dst *dst,
988 int i)
989 {
990 int ret;
991
992 if (i <= score->rule) {
993 switch (i) {
994 case IPV6_SADDR_RULE_SCOPE:
995 ret = score->scopedist;
996 break;
997 case IPV6_SADDR_RULE_PREFIX:
998 ret = score->matchlen;
999 break;
1000 default:
1001 ret = !!test_bit(i, score->scorebits);
1002 }
1003 goto out;
1004 }
1005
1006 switch (i) {
1007 case IPV6_SADDR_RULE_INIT:
1008 /* Rule 0: remember if hiscore is not ready yet */
1009 ret = !!score->ifa;
1010 break;
1011 case IPV6_SADDR_RULE_LOCAL:
1012 /* Rule 1: Prefer same address */
1013 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1014 break;
1015 case IPV6_SADDR_RULE_SCOPE:
1016 /* Rule 2: Prefer appropriate scope
1017 *
1018 * ret
1019 * ^
1020 * -1 | d 15
1021 * ---+--+-+---> scope
1022 * |
1023 * | d is scope of the destination.
1024 * B-d | \
1025 * | \ <- smaller scope is better if
1026 * B-15 | \ if scope is enough for destinaion.
1027 * | ret = B - scope (-1 <= scope >= d <= 15).
1028 * d-C-1 | /
1029 * |/ <- greater is better
1030 * -C / if scope is not enough for destination.
1031 * /| ret = scope - C (-1 <= d < scope <= 15).
1032 *
1033 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1034 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1035 * Assume B = 0 and we get C > 29.
1036 */
1037 ret = __ipv6_addr_src_scope(score->addr_type);
1038 if (ret >= dst->scope)
1039 ret = -ret;
1040 else
1041 ret -= 128; /* 30 is enough */
1042 score->scopedist = ret;
1043 break;
1044 case IPV6_SADDR_RULE_PREFERRED:
1045 /* Rule 3: Avoid deprecated and optimistic addresses */
1046 ret = ipv6_saddr_preferred(score->addr_type) ||
1047 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1048 break;
1049 #ifdef CONFIG_IPV6_MIP6
1050 case IPV6_SADDR_RULE_HOA:
1051 {
1052 /* Rule 4: Prefer home address */
1053 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1054 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1055 break;
1056 }
1057 #endif
1058 case IPV6_SADDR_RULE_OIF:
1059 /* Rule 5: Prefer outgoing interface */
1060 ret = (!dst->ifindex ||
1061 dst->ifindex == score->ifa->idev->dev->ifindex);
1062 break;
1063 case IPV6_SADDR_RULE_LABEL:
1064 /* Rule 6: Prefer matching label */
1065 ret = ipv6_addr_label(net,
1066 &score->ifa->addr, score->addr_type,
1067 score->ifa->idev->dev->ifindex) == dst->label;
1068 break;
1069 #ifdef CONFIG_IPV6_PRIVACY
1070 case IPV6_SADDR_RULE_PRIVACY:
1071 {
1072 /* Rule 7: Prefer public address
1073 * Note: prefer temporary address if use_tempaddr >= 2
1074 */
1075 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1076 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1077 score->ifa->idev->cnf.use_tempaddr >= 2;
1078 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1079 break;
1080 }
1081 #endif
1082 case IPV6_SADDR_RULE_ORCHID:
1083 /* Rule 8-: Prefer ORCHID vs ORCHID or
1084 * non-ORCHID vs non-ORCHID
1085 */
1086 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1087 ipv6_addr_orchid(dst->addr));
1088 break;
1089 case IPV6_SADDR_RULE_PREFIX:
1090 /* Rule 8: Use longest matching prefix */
1091 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr,
1092 dst->addr);
1093 break;
1094 default:
1095 ret = 0;
1096 }
1097
1098 if (ret)
1099 __set_bit(i, score->scorebits);
1100 score->rule = i;
1101 out:
1102 return ret;
1103 }
1104
1105 int ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev,
1106 const struct in6_addr *daddr, unsigned int prefs,
1107 struct in6_addr *saddr)
1108 {
1109 struct ipv6_saddr_score scores[2],
1110 *score = &scores[0], *hiscore = &scores[1];
1111 struct ipv6_saddr_dst dst;
1112 struct net_device *dev;
1113 int dst_type;
1114
1115 dst_type = __ipv6_addr_type(daddr);
1116 dst.addr = daddr;
1117 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1118 dst.scope = __ipv6_addr_src_scope(dst_type);
1119 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1120 dst.prefs = prefs;
1121
1122 hiscore->rule = -1;
1123 hiscore->ifa = NULL;
1124
1125 rcu_read_lock();
1126
1127 for_each_netdev_rcu(net, dev) {
1128 struct inet6_dev *idev;
1129
1130 /* Candidate Source Address (section 4)
1131 * - multicast and link-local destination address,
1132 * the set of candidate source address MUST only
1133 * include addresses assigned to interfaces
1134 * belonging to the same link as the outgoing
1135 * interface.
1136 * (- For site-local destination addresses, the
1137 * set of candidate source addresses MUST only
1138 * include addresses assigned to interfaces
1139 * belonging to the same site as the outgoing
1140 * interface.)
1141 */
1142 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1143 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1144 dst.ifindex && dev->ifindex != dst.ifindex)
1145 continue;
1146
1147 idev = __in6_dev_get(dev);
1148 if (!idev)
1149 continue;
1150
1151 read_lock_bh(&idev->lock);
1152 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1153 int i;
1154
1155 /*
1156 * - Tentative Address (RFC2462 section 5.4)
1157 * - A tentative address is not considered
1158 * "assigned to an interface" in the traditional
1159 * sense, unless it is also flagged as optimistic.
1160 * - Candidate Source Address (section 4)
1161 * - In any case, anycast addresses, multicast
1162 * addresses, and the unspecified address MUST
1163 * NOT be included in a candidate set.
1164 */
1165 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1166 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1167 continue;
1168
1169 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1170
1171 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1172 score->addr_type & IPV6_ADDR_MULTICAST)) {
1173 LIMIT_NETDEBUG(KERN_DEBUG
1174 "ADDRCONF: unspecified / multicast address "
1175 "assigned as unicast address on %s",
1176 dev->name);
1177 continue;
1178 }
1179
1180 score->rule = -1;
1181 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1182
1183 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1184 int minihiscore, miniscore;
1185
1186 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1187 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1188
1189 if (minihiscore > miniscore) {
1190 if (i == IPV6_SADDR_RULE_SCOPE &&
1191 score->scopedist > 0) {
1192 /*
1193 * special case:
1194 * each remaining entry
1195 * has too small (not enough)
1196 * scope, because ifa entries
1197 * are sorted by their scope
1198 * values.
1199 */
1200 goto try_nextdev;
1201 }
1202 break;
1203 } else if (minihiscore < miniscore) {
1204 if (hiscore->ifa)
1205 in6_ifa_put(hiscore->ifa);
1206
1207 in6_ifa_hold(score->ifa);
1208
1209 swap(hiscore, score);
1210
1211 /* restore our iterator */
1212 score->ifa = hiscore->ifa;
1213
1214 break;
1215 }
1216 }
1217 }
1218 try_nextdev:
1219 read_unlock_bh(&idev->lock);
1220 }
1221 rcu_read_unlock();
1222
1223 if (!hiscore->ifa)
1224 return -EADDRNOTAVAIL;
1225
1226 *saddr = hiscore->ifa->addr;
1227 in6_ifa_put(hiscore->ifa);
1228 return 0;
1229 }
1230 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1231
1232 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1233 unsigned char banned_flags)
1234 {
1235 struct inet6_dev *idev;
1236 int err = -EADDRNOTAVAIL;
1237
1238 rcu_read_lock();
1239 idev = __in6_dev_get(dev);
1240 if (idev) {
1241 struct inet6_ifaddr *ifp;
1242
1243 read_lock_bh(&idev->lock);
1244 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1245 if (ifp->scope == IFA_LINK &&
1246 !(ifp->flags & banned_flags)) {
1247 *addr = ifp->addr;
1248 err = 0;
1249 break;
1250 }
1251 }
1252 read_unlock_bh(&idev->lock);
1253 }
1254 rcu_read_unlock();
1255 return err;
1256 }
1257
1258 static int ipv6_count_addresses(struct inet6_dev *idev)
1259 {
1260 int cnt = 0;
1261 struct inet6_ifaddr *ifp;
1262
1263 read_lock_bh(&idev->lock);
1264 list_for_each_entry(ifp, &idev->addr_list, if_list)
1265 cnt++;
1266 read_unlock_bh(&idev->lock);
1267 return cnt;
1268 }
1269
1270 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1271 struct net_device *dev, int strict)
1272 {
1273 struct inet6_ifaddr *ifp;
1274 struct hlist_node *node;
1275 unsigned int hash = ipv6_addr_hash(addr);
1276
1277 rcu_read_lock_bh();
1278 hlist_for_each_entry_rcu(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1279 if (!net_eq(dev_net(ifp->idev->dev), net))
1280 continue;
1281 if (ipv6_addr_equal(&ifp->addr, addr) &&
1282 !(ifp->flags&IFA_F_TENTATIVE) &&
1283 (dev == NULL || ifp->idev->dev == dev ||
1284 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1285 rcu_read_unlock_bh();
1286 return 1;
1287 }
1288 }
1289
1290 rcu_read_unlock_bh();
1291 return 0;
1292 }
1293 EXPORT_SYMBOL(ipv6_chk_addr);
1294
1295 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1296 struct net_device *dev)
1297 {
1298 unsigned int hash = ipv6_addr_hash(addr);
1299 struct inet6_ifaddr *ifp;
1300 struct hlist_node *node;
1301
1302 hlist_for_each_entry(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1303 if (!net_eq(dev_net(ifp->idev->dev), net))
1304 continue;
1305 if (ipv6_addr_equal(&ifp->addr, addr)) {
1306 if (dev == NULL || ifp->idev->dev == dev)
1307 return true;
1308 }
1309 }
1310 return false;
1311 }
1312
1313 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1314 {
1315 struct inet6_dev *idev;
1316 struct inet6_ifaddr *ifa;
1317 int onlink;
1318
1319 onlink = 0;
1320 rcu_read_lock();
1321 idev = __in6_dev_get(dev);
1322 if (idev) {
1323 read_lock_bh(&idev->lock);
1324 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1325 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1326 ifa->prefix_len);
1327 if (onlink)
1328 break;
1329 }
1330 read_unlock_bh(&idev->lock);
1331 }
1332 rcu_read_unlock();
1333 return onlink;
1334 }
1335 EXPORT_SYMBOL(ipv6_chk_prefix);
1336
1337 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1338 struct net_device *dev, int strict)
1339 {
1340 struct inet6_ifaddr *ifp, *result = NULL;
1341 unsigned int hash = ipv6_addr_hash(addr);
1342 struct hlist_node *node;
1343
1344 rcu_read_lock_bh();
1345 hlist_for_each_entry_rcu_bh(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1346 if (!net_eq(dev_net(ifp->idev->dev), net))
1347 continue;
1348 if (ipv6_addr_equal(&ifp->addr, addr)) {
1349 if (dev == NULL || ifp->idev->dev == dev ||
1350 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1351 result = ifp;
1352 in6_ifa_hold(ifp);
1353 break;
1354 }
1355 }
1356 }
1357 rcu_read_unlock_bh();
1358
1359 return result;
1360 }
1361
1362 /* Gets referenced address, destroys ifaddr */
1363
1364 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1365 {
1366 if (ifp->flags&IFA_F_PERMANENT) {
1367 spin_lock_bh(&ifp->lock);
1368 addrconf_del_timer(ifp);
1369 ifp->flags |= IFA_F_TENTATIVE;
1370 if (dad_failed)
1371 ifp->flags |= IFA_F_DADFAILED;
1372 spin_unlock_bh(&ifp->lock);
1373 if (dad_failed)
1374 ipv6_ifa_notify(0, ifp);
1375 in6_ifa_put(ifp);
1376 #ifdef CONFIG_IPV6_PRIVACY
1377 } else if (ifp->flags&IFA_F_TEMPORARY) {
1378 struct inet6_ifaddr *ifpub;
1379 spin_lock_bh(&ifp->lock);
1380 ifpub = ifp->ifpub;
1381 if (ifpub) {
1382 in6_ifa_hold(ifpub);
1383 spin_unlock_bh(&ifp->lock);
1384 ipv6_create_tempaddr(ifpub, ifp);
1385 in6_ifa_put(ifpub);
1386 } else {
1387 spin_unlock_bh(&ifp->lock);
1388 }
1389 ipv6_del_addr(ifp);
1390 #endif
1391 } else
1392 ipv6_del_addr(ifp);
1393 }
1394
1395 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1396 {
1397 int err = -ENOENT;
1398
1399 spin_lock(&ifp->state_lock);
1400 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1401 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1402 err = 0;
1403 }
1404 spin_unlock(&ifp->state_lock);
1405
1406 return err;
1407 }
1408
1409 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1410 {
1411 struct inet6_dev *idev = ifp->idev;
1412
1413 if (addrconf_dad_end(ifp)) {
1414 in6_ifa_put(ifp);
1415 return;
1416 }
1417
1418 if (net_ratelimit())
1419 printk(KERN_INFO "%s: IPv6 duplicate address %pI6c detected!\n",
1420 ifp->idev->dev->name, &ifp->addr);
1421
1422 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1423 struct in6_addr addr;
1424
1425 addr.s6_addr32[0] = htonl(0xfe800000);
1426 addr.s6_addr32[1] = 0;
1427
1428 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1429 ipv6_addr_equal(&ifp->addr, &addr)) {
1430 /* DAD failed for link-local based on MAC address */
1431 idev->cnf.disable_ipv6 = 1;
1432
1433 printk(KERN_INFO "%s: IPv6 being disabled!\n",
1434 ifp->idev->dev->name);
1435 }
1436 }
1437
1438 addrconf_dad_stop(ifp, 1);
1439 }
1440
1441 /* Join to solicited addr multicast group. */
1442
1443 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1444 {
1445 struct in6_addr maddr;
1446
1447 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1448 return;
1449
1450 addrconf_addr_solict_mult(addr, &maddr);
1451 ipv6_dev_mc_inc(dev, &maddr);
1452 }
1453
1454 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1455 {
1456 struct in6_addr maddr;
1457
1458 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1459 return;
1460
1461 addrconf_addr_solict_mult(addr, &maddr);
1462 __ipv6_dev_mc_dec(idev, &maddr);
1463 }
1464
1465 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1466 {
1467 struct in6_addr addr;
1468 if (ifp->prefix_len == 127) /* RFC 6164 */
1469 return;
1470 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1471 if (ipv6_addr_any(&addr))
1472 return;
1473 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1474 }
1475
1476 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1477 {
1478 struct in6_addr addr;
1479 if (ifp->prefix_len == 127) /* RFC 6164 */
1480 return;
1481 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1482 if (ipv6_addr_any(&addr))
1483 return;
1484 __ipv6_dev_ac_dec(ifp->idev, &addr);
1485 }
1486
1487 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1488 {
1489 if (dev->addr_len != ETH_ALEN)
1490 return -1;
1491 memcpy(eui, dev->dev_addr, 3);
1492 memcpy(eui + 5, dev->dev_addr + 3, 3);
1493
1494 /*
1495 * The zSeries OSA network cards can be shared among various
1496 * OS instances, but the OSA cards have only one MAC address.
1497 * This leads to duplicate address conflicts in conjunction
1498 * with IPv6 if more than one instance uses the same card.
1499 *
1500 * The driver for these cards can deliver a unique 16-bit
1501 * identifier for each instance sharing the same card. It is
1502 * placed instead of 0xFFFE in the interface identifier. The
1503 * "u" bit of the interface identifier is not inverted in this
1504 * case. Hence the resulting interface identifier has local
1505 * scope according to RFC2373.
1506 */
1507 if (dev->dev_id) {
1508 eui[3] = (dev->dev_id >> 8) & 0xFF;
1509 eui[4] = dev->dev_id & 0xFF;
1510 } else {
1511 eui[3] = 0xFF;
1512 eui[4] = 0xFE;
1513 eui[0] ^= 2;
1514 }
1515 return 0;
1516 }
1517
1518 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1519 {
1520 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1521 if (dev->addr_len != ARCNET_ALEN)
1522 return -1;
1523 memset(eui, 0, 7);
1524 eui[7] = *(u8 *)dev->dev_addr;
1525 return 0;
1526 }
1527
1528 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1529 {
1530 if (dev->addr_len != INFINIBAND_ALEN)
1531 return -1;
1532 memcpy(eui, dev->dev_addr + 12, 8);
1533 eui[0] |= 2;
1534 return 0;
1535 }
1536
1537 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1538 {
1539 if (addr == 0)
1540 return -1;
1541 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1542 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1543 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1544 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1545 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1546 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1547 eui[1] = 0;
1548 eui[2] = 0x5E;
1549 eui[3] = 0xFE;
1550 memcpy(eui + 4, &addr, 4);
1551 return 0;
1552 }
1553
1554 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1555 {
1556 if (dev->priv_flags & IFF_ISATAP)
1557 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1558 return -1;
1559 }
1560
1561 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
1562 {
1563 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1564 }
1565
1566 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1567 {
1568 switch (dev->type) {
1569 case ARPHRD_ETHER:
1570 case ARPHRD_FDDI:
1571 case ARPHRD_IEEE802_TR:
1572 return addrconf_ifid_eui48(eui, dev);
1573 case ARPHRD_ARCNET:
1574 return addrconf_ifid_arcnet(eui, dev);
1575 case ARPHRD_INFINIBAND:
1576 return addrconf_ifid_infiniband(eui, dev);
1577 case ARPHRD_SIT:
1578 return addrconf_ifid_sit(eui, dev);
1579 case ARPHRD_IPGRE:
1580 return addrconf_ifid_gre(eui, dev);
1581 }
1582 return -1;
1583 }
1584
1585 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1586 {
1587 int err = -1;
1588 struct inet6_ifaddr *ifp;
1589
1590 read_lock_bh(&idev->lock);
1591 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1592 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1593 memcpy(eui, ifp->addr.s6_addr+8, 8);
1594 err = 0;
1595 break;
1596 }
1597 }
1598 read_unlock_bh(&idev->lock);
1599 return err;
1600 }
1601
1602 #ifdef CONFIG_IPV6_PRIVACY
1603 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1604 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1605 {
1606 regen:
1607 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1608 idev->rndid[0] &= ~0x02;
1609
1610 /*
1611 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1612 * check if generated address is not inappropriate
1613 *
1614 * - Reserved subnet anycast (RFC 2526)
1615 * 11111101 11....11 1xxxxxxx
1616 * - ISATAP (RFC4214) 6.1
1617 * 00-00-5E-FE-xx-xx-xx-xx
1618 * - value 0
1619 * - XXX: already assigned to an address on the device
1620 */
1621 if (idev->rndid[0] == 0xfd &&
1622 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1623 (idev->rndid[7]&0x80))
1624 goto regen;
1625 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1626 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1627 goto regen;
1628 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1629 goto regen;
1630 }
1631
1632 return 0;
1633 }
1634
1635 static void ipv6_regen_rndid(unsigned long data)
1636 {
1637 struct inet6_dev *idev = (struct inet6_dev *) data;
1638 unsigned long expires;
1639
1640 rcu_read_lock_bh();
1641 write_lock_bh(&idev->lock);
1642
1643 if (idev->dead)
1644 goto out;
1645
1646 if (__ipv6_regen_rndid(idev) < 0)
1647 goto out;
1648
1649 expires = jiffies +
1650 idev->cnf.temp_prefered_lft * HZ -
1651 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time -
1652 idev->cnf.max_desync_factor * HZ;
1653 if (time_before(expires, jiffies)) {
1654 printk(KERN_WARNING
1655 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1656 idev->dev->name);
1657 goto out;
1658 }
1659
1660 if (!mod_timer(&idev->regen_timer, expires))
1661 in6_dev_hold(idev);
1662
1663 out:
1664 write_unlock_bh(&idev->lock);
1665 rcu_read_unlock_bh();
1666 in6_dev_put(idev);
1667 }
1668
1669 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
1670 {
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 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
1713 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
1714 int plen,
1715 const struct net_device *dev,
1716 u32 flags, u32 noflags)
1717 {
1718 struct fib6_node *fn;
1719 struct rt6_info *rt = NULL;
1720 struct fib6_table *table;
1721
1722 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX);
1723 if (table == NULL)
1724 return NULL;
1725
1726 write_lock_bh(&table->tb6_lock);
1727 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
1728 if (!fn)
1729 goto out;
1730 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1731 if (rt->dst.dev->ifindex != dev->ifindex)
1732 continue;
1733 if ((rt->rt6i_flags & flags) != flags)
1734 continue;
1735 if ((noflags != 0) && ((rt->rt6i_flags & flags) != 0))
1736 continue;
1737 dst_hold(&rt->dst);
1738 break;
1739 }
1740 out:
1741 write_unlock_bh(&table->tb6_lock);
1742 return rt;
1743 }
1744
1745
1746 /* Create "default" multicast route to the interface */
1747
1748 static void addrconf_add_mroute(struct net_device *dev)
1749 {
1750 struct fib6_config cfg = {
1751 .fc_table = RT6_TABLE_LOCAL,
1752 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1753 .fc_ifindex = dev->ifindex,
1754 .fc_dst_len = 8,
1755 .fc_flags = RTF_UP,
1756 .fc_nlinfo.nl_net = dev_net(dev),
1757 };
1758
1759 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1760
1761 ip6_route_add(&cfg);
1762 }
1763
1764 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1765 static void sit_route_add(struct net_device *dev)
1766 {
1767 struct fib6_config cfg = {
1768 .fc_table = RT6_TABLE_MAIN,
1769 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1770 .fc_ifindex = dev->ifindex,
1771 .fc_dst_len = 96,
1772 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1773 .fc_nlinfo.nl_net = dev_net(dev),
1774 };
1775
1776 /* prefix length - 96 bits "::d.d.d.d" */
1777 ip6_route_add(&cfg);
1778 }
1779 #endif
1780
1781 static void addrconf_add_lroute(struct net_device *dev)
1782 {
1783 struct in6_addr addr;
1784
1785 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1786 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1787 }
1788
1789 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1790 {
1791 struct inet6_dev *idev;
1792
1793 ASSERT_RTNL();
1794
1795 idev = ipv6_find_idev(dev);
1796 if (!idev)
1797 return ERR_PTR(-ENOBUFS);
1798
1799 if (idev->cnf.disable_ipv6)
1800 return ERR_PTR(-EACCES);
1801
1802 /* Add default multicast route */
1803 if (!(dev->flags & IFF_LOOPBACK))
1804 addrconf_add_mroute(dev);
1805
1806 /* Add link local route */
1807 addrconf_add_lroute(dev);
1808 return idev;
1809 }
1810
1811 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
1812 {
1813 struct prefix_info *pinfo;
1814 __u32 valid_lft;
1815 __u32 prefered_lft;
1816 int addr_type;
1817 struct inet6_dev *in6_dev;
1818 struct net *net = dev_net(dev);
1819
1820 pinfo = (struct prefix_info *) opt;
1821
1822 if (len < sizeof(struct prefix_info)) {
1823 ADBG(("addrconf: prefix option too short\n"));
1824 return;
1825 }
1826
1827 /*
1828 * Validation checks ([ADDRCONF], page 19)
1829 */
1830
1831 addr_type = ipv6_addr_type(&pinfo->prefix);
1832
1833 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1834 return;
1835
1836 valid_lft = ntohl(pinfo->valid);
1837 prefered_lft = ntohl(pinfo->prefered);
1838
1839 if (prefered_lft > valid_lft) {
1840 if (net_ratelimit())
1841 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1842 return;
1843 }
1844
1845 in6_dev = in6_dev_get(dev);
1846
1847 if (in6_dev == NULL) {
1848 if (net_ratelimit())
1849 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1850 return;
1851 }
1852
1853 /*
1854 * Two things going on here:
1855 * 1) Add routes for on-link prefixes
1856 * 2) Configure prefixes with the auto flag set
1857 */
1858
1859 if (pinfo->onlink) {
1860 struct rt6_info *rt;
1861 unsigned long rt_expires;
1862
1863 /* Avoid arithmetic overflow. Really, we could
1864 * save rt_expires in seconds, likely valid_lft,
1865 * but it would require division in fib gc, that it
1866 * not good.
1867 */
1868 if (HZ > USER_HZ)
1869 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
1870 else
1871 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
1872
1873 if (addrconf_finite_timeout(rt_expires))
1874 rt_expires *= HZ;
1875
1876 rt = addrconf_get_prefix_route(&pinfo->prefix,
1877 pinfo->prefix_len,
1878 dev,
1879 RTF_ADDRCONF | RTF_PREFIX_RT,
1880 RTF_GATEWAY | RTF_DEFAULT);
1881
1882 if (rt) {
1883 /* Autoconf prefix route */
1884 if (valid_lft == 0) {
1885 ip6_del_rt(rt);
1886 rt = NULL;
1887 } else if (addrconf_finite_timeout(rt_expires)) {
1888 /* not infinity */
1889 rt->dst.expires = jiffies + rt_expires;
1890 rt->rt6i_flags |= RTF_EXPIRES;
1891 } else {
1892 rt->rt6i_flags &= ~RTF_EXPIRES;
1893 rt->dst.expires = 0;
1894 }
1895 } else if (valid_lft) {
1896 clock_t expires = 0;
1897 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
1898 if (addrconf_finite_timeout(rt_expires)) {
1899 /* not infinity */
1900 flags |= RTF_EXPIRES;
1901 expires = jiffies_to_clock_t(rt_expires);
1902 }
1903 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1904 dev, expires, flags);
1905 }
1906 if (rt)
1907 dst_release(&rt->dst);
1908 }
1909
1910 /* Try to figure out our local address for this prefix */
1911
1912 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1913 struct inet6_ifaddr *ifp;
1914 struct in6_addr addr;
1915 int create = 0, update_lft = 0;
1916
1917 if (pinfo->prefix_len == 64) {
1918 memcpy(&addr, &pinfo->prefix, 8);
1919 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1920 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1921 in6_dev_put(in6_dev);
1922 return;
1923 }
1924 goto ok;
1925 }
1926 if (net_ratelimit())
1927 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1928 pinfo->prefix_len);
1929 in6_dev_put(in6_dev);
1930 return;
1931
1932 ok:
1933
1934 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1935
1936 if (ifp == NULL && valid_lft) {
1937 int max_addresses = in6_dev->cnf.max_addresses;
1938 u32 addr_flags = 0;
1939
1940 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1941 if (in6_dev->cnf.optimistic_dad &&
1942 !net->ipv6.devconf_all->forwarding && sllao)
1943 addr_flags = IFA_F_OPTIMISTIC;
1944 #endif
1945
1946 /* Do not allow to create too much of autoconfigured
1947 * addresses; this would be too easy way to crash kernel.
1948 */
1949 if (!max_addresses ||
1950 ipv6_count_addresses(in6_dev) < max_addresses)
1951 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1952 addr_type&IPV6_ADDR_SCOPE_MASK,
1953 addr_flags);
1954
1955 if (!ifp || IS_ERR(ifp)) {
1956 in6_dev_put(in6_dev);
1957 return;
1958 }
1959
1960 update_lft = create = 1;
1961 ifp->cstamp = jiffies;
1962 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1963 }
1964
1965 if (ifp) {
1966 int flags;
1967 unsigned long now;
1968 #ifdef CONFIG_IPV6_PRIVACY
1969 struct inet6_ifaddr *ift;
1970 #endif
1971 u32 stored_lft;
1972
1973 /* update lifetime (RFC2462 5.5.3 e) */
1974 spin_lock(&ifp->lock);
1975 now = jiffies;
1976 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1977 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1978 else
1979 stored_lft = 0;
1980 if (!update_lft && stored_lft) {
1981 if (valid_lft > MIN_VALID_LIFETIME ||
1982 valid_lft > stored_lft)
1983 update_lft = 1;
1984 else if (stored_lft <= MIN_VALID_LIFETIME) {
1985 /* valid_lft <= stored_lft is always true */
1986 /*
1987 * RFC 4862 Section 5.5.3e:
1988 * "Note that the preferred lifetime of
1989 * the corresponding address is always
1990 * reset to the Preferred Lifetime in
1991 * the received Prefix Information
1992 * option, regardless of whether the
1993 * valid lifetime is also reset or
1994 * ignored."
1995 *
1996 * So if the preferred lifetime in
1997 * this advertisement is different
1998 * than what we have stored, but the
1999 * valid lifetime is invalid, just
2000 * reset prefered_lft.
2001 *
2002 * We must set the valid lifetime
2003 * to the stored lifetime since we'll
2004 * be updating the timestamp below,
2005 * else we'll set it back to the
2006 * minimum.
2007 */
2008 if (prefered_lft != ifp->prefered_lft) {
2009 valid_lft = stored_lft;
2010 update_lft = 1;
2011 }
2012 } else {
2013 valid_lft = MIN_VALID_LIFETIME;
2014 if (valid_lft < prefered_lft)
2015 prefered_lft = valid_lft;
2016 update_lft = 1;
2017 }
2018 }
2019
2020 if (update_lft) {
2021 ifp->valid_lft = valid_lft;
2022 ifp->prefered_lft = prefered_lft;
2023 ifp->tstamp = now;
2024 flags = ifp->flags;
2025 ifp->flags &= ~IFA_F_DEPRECATED;
2026 spin_unlock(&ifp->lock);
2027
2028 if (!(flags&IFA_F_TENTATIVE))
2029 ipv6_ifa_notify(0, ifp);
2030 } else
2031 spin_unlock(&ifp->lock);
2032
2033 #ifdef CONFIG_IPV6_PRIVACY
2034 read_lock_bh(&in6_dev->lock);
2035 /* update all temporary addresses in the list */
2036 list_for_each_entry(ift, &in6_dev->tempaddr_list,
2037 tmp_list) {
2038 int age, max_valid, max_prefered;
2039
2040 if (ifp != ift->ifpub)
2041 continue;
2042
2043 /*
2044 * RFC 4941 section 3.3:
2045 * If a received option will extend the lifetime
2046 * of a public address, the lifetimes of
2047 * temporary addresses should be extended,
2048 * subject to the overall constraint that no
2049 * temporary addresses should ever remain
2050 * "valid" or "preferred" for a time longer than
2051 * (TEMP_VALID_LIFETIME) or
2052 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR),
2053 * respectively.
2054 */
2055 age = (now - ift->cstamp) / HZ;
2056 max_valid = in6_dev->cnf.temp_valid_lft - age;
2057 if (max_valid < 0)
2058 max_valid = 0;
2059
2060 max_prefered = in6_dev->cnf.temp_prefered_lft -
2061 in6_dev->cnf.max_desync_factor -
2062 age;
2063 if (max_prefered < 0)
2064 max_prefered = 0;
2065
2066 if (valid_lft > max_valid)
2067 valid_lft = max_valid;
2068
2069 if (prefered_lft > max_prefered)
2070 prefered_lft = max_prefered;
2071
2072 spin_lock(&ift->lock);
2073 flags = ift->flags;
2074 ift->valid_lft = valid_lft;
2075 ift->prefered_lft = prefered_lft;
2076 ift->tstamp = now;
2077 if (prefered_lft > 0)
2078 ift->flags &= ~IFA_F_DEPRECATED;
2079
2080 spin_unlock(&ift->lock);
2081 if (!(flags&IFA_F_TENTATIVE))
2082 ipv6_ifa_notify(0, ift);
2083 }
2084
2085 if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) {
2086 /*
2087 * When a new public address is created as
2088 * described in [ADDRCONF], also create a new
2089 * temporary address. Also create a temporary
2090 * address if it's enabled but no temporary
2091 * address currently exists.
2092 */
2093 read_unlock_bh(&in6_dev->lock);
2094 ipv6_create_tempaddr(ifp, NULL);
2095 } else {
2096 read_unlock_bh(&in6_dev->lock);
2097 }
2098 #endif
2099 in6_ifa_put(ifp);
2100 addrconf_verify(0);
2101 }
2102 }
2103 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2104 in6_dev_put(in6_dev);
2105 }
2106
2107 /*
2108 * Set destination address.
2109 * Special case for SIT interfaces where we create a new "virtual"
2110 * device.
2111 */
2112 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2113 {
2114 struct in6_ifreq ireq;
2115 struct net_device *dev;
2116 int err = -EINVAL;
2117
2118 rtnl_lock();
2119
2120 err = -EFAULT;
2121 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2122 goto err_exit;
2123
2124 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2125
2126 err = -ENODEV;
2127 if (dev == NULL)
2128 goto err_exit;
2129
2130 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2131 if (dev->type == ARPHRD_SIT) {
2132 const struct net_device_ops *ops = dev->netdev_ops;
2133 struct ifreq ifr;
2134 struct ip_tunnel_parm p;
2135
2136 err = -EADDRNOTAVAIL;
2137 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2138 goto err_exit;
2139
2140 memset(&p, 0, sizeof(p));
2141 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2142 p.iph.saddr = 0;
2143 p.iph.version = 4;
2144 p.iph.ihl = 5;
2145 p.iph.protocol = IPPROTO_IPV6;
2146 p.iph.ttl = 64;
2147 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2148
2149 if (ops->ndo_do_ioctl) {
2150 mm_segment_t oldfs = get_fs();
2151
2152 set_fs(KERNEL_DS);
2153 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2154 set_fs(oldfs);
2155 } else
2156 err = -EOPNOTSUPP;
2157
2158 if (err == 0) {
2159 err = -ENOBUFS;
2160 dev = __dev_get_by_name(net, p.name);
2161 if (!dev)
2162 goto err_exit;
2163 err = dev_open(dev);
2164 }
2165 }
2166 #endif
2167
2168 err_exit:
2169 rtnl_unlock();
2170 return err;
2171 }
2172
2173 /*
2174 * Manual configuration of address on an interface
2175 */
2176 static int inet6_addr_add(struct net *net, int ifindex, const struct in6_addr *pfx,
2177 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
2178 __u32 valid_lft)
2179 {
2180 struct inet6_ifaddr *ifp;
2181 struct inet6_dev *idev;
2182 struct net_device *dev;
2183 int scope;
2184 u32 flags;
2185 clock_t expires;
2186 unsigned long timeout;
2187
2188 ASSERT_RTNL();
2189
2190 if (plen > 128)
2191 return -EINVAL;
2192
2193 /* check the lifetime */
2194 if (!valid_lft || prefered_lft > valid_lft)
2195 return -EINVAL;
2196
2197 dev = __dev_get_by_index(net, ifindex);
2198 if (!dev)
2199 return -ENODEV;
2200
2201 idev = addrconf_add_dev(dev);
2202 if (IS_ERR(idev))
2203 return PTR_ERR(idev);
2204
2205 scope = ipv6_addr_scope(pfx);
2206
2207 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2208 if (addrconf_finite_timeout(timeout)) {
2209 expires = jiffies_to_clock_t(timeout * HZ);
2210 valid_lft = timeout;
2211 flags = RTF_EXPIRES;
2212 } else {
2213 expires = 0;
2214 flags = 0;
2215 ifa_flags |= IFA_F_PERMANENT;
2216 }
2217
2218 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2219 if (addrconf_finite_timeout(timeout)) {
2220 if (timeout == 0)
2221 ifa_flags |= IFA_F_DEPRECATED;
2222 prefered_lft = timeout;
2223 }
2224
2225 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2226
2227 if (!IS_ERR(ifp)) {
2228 spin_lock_bh(&ifp->lock);
2229 ifp->valid_lft = valid_lft;
2230 ifp->prefered_lft = prefered_lft;
2231 ifp->tstamp = jiffies;
2232 spin_unlock_bh(&ifp->lock);
2233
2234 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2235 expires, flags);
2236 /*
2237 * Note that section 3.1 of RFC 4429 indicates
2238 * that the Optimistic flag should not be set for
2239 * manually configured addresses
2240 */
2241 addrconf_dad_start(ifp, 0);
2242 in6_ifa_put(ifp);
2243 addrconf_verify(0);
2244 return 0;
2245 }
2246
2247 return PTR_ERR(ifp);
2248 }
2249
2250 static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx,
2251 unsigned int plen)
2252 {
2253 struct inet6_ifaddr *ifp;
2254 struct inet6_dev *idev;
2255 struct net_device *dev;
2256
2257 if (plen > 128)
2258 return -EINVAL;
2259
2260 dev = __dev_get_by_index(net, ifindex);
2261 if (!dev)
2262 return -ENODEV;
2263
2264 if ((idev = __in6_dev_get(dev)) == NULL)
2265 return -ENXIO;
2266
2267 read_lock_bh(&idev->lock);
2268 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2269 if (ifp->prefix_len == plen &&
2270 ipv6_addr_equal(pfx, &ifp->addr)) {
2271 in6_ifa_hold(ifp);
2272 read_unlock_bh(&idev->lock);
2273
2274 ipv6_del_addr(ifp);
2275
2276 /* If the last address is deleted administratively,
2277 disable IPv6 on this interface.
2278 */
2279 if (list_empty(&idev->addr_list))
2280 addrconf_ifdown(idev->dev, 1);
2281 return 0;
2282 }
2283 }
2284 read_unlock_bh(&idev->lock);
2285 return -EADDRNOTAVAIL;
2286 }
2287
2288
2289 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2290 {
2291 struct in6_ifreq ireq;
2292 int err;
2293
2294 if (!capable(CAP_NET_ADMIN))
2295 return -EPERM;
2296
2297 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2298 return -EFAULT;
2299
2300 rtnl_lock();
2301 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2302 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2303 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2304 rtnl_unlock();
2305 return err;
2306 }
2307
2308 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2309 {
2310 struct in6_ifreq ireq;
2311 int err;
2312
2313 if (!capable(CAP_NET_ADMIN))
2314 return -EPERM;
2315
2316 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2317 return -EFAULT;
2318
2319 rtnl_lock();
2320 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2321 ireq.ifr6_prefixlen);
2322 rtnl_unlock();
2323 return err;
2324 }
2325
2326 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2327 int plen, int scope)
2328 {
2329 struct inet6_ifaddr *ifp;
2330
2331 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT);
2332 if (!IS_ERR(ifp)) {
2333 spin_lock_bh(&ifp->lock);
2334 ifp->flags &= ~IFA_F_TENTATIVE;
2335 spin_unlock_bh(&ifp->lock);
2336 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2337 in6_ifa_put(ifp);
2338 }
2339 }
2340
2341 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2342 static void sit_add_v4_addrs(struct inet6_dev *idev)
2343 {
2344 struct in6_addr addr;
2345 struct net_device *dev;
2346 struct net *net = dev_net(idev->dev);
2347 int scope;
2348
2349 ASSERT_RTNL();
2350
2351 memset(&addr, 0, sizeof(struct in6_addr));
2352 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2353
2354 if (idev->dev->flags&IFF_POINTOPOINT) {
2355 addr.s6_addr32[0] = htonl(0xfe800000);
2356 scope = IFA_LINK;
2357 } else {
2358 scope = IPV6_ADDR_COMPATv4;
2359 }
2360
2361 if (addr.s6_addr32[3]) {
2362 add_addr(idev, &addr, 128, scope);
2363 return;
2364 }
2365
2366 for_each_netdev(net, dev) {
2367 struct in_device *in_dev = __in_dev_get_rtnl(dev);
2368 if (in_dev && (dev->flags & IFF_UP)) {
2369 struct in_ifaddr *ifa;
2370
2371 int flag = scope;
2372
2373 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2374 int plen;
2375
2376 addr.s6_addr32[3] = ifa->ifa_local;
2377
2378 if (ifa->ifa_scope == RT_SCOPE_LINK)
2379 continue;
2380 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2381 if (idev->dev->flags&IFF_POINTOPOINT)
2382 continue;
2383 flag |= IFA_HOST;
2384 }
2385 if (idev->dev->flags&IFF_POINTOPOINT)
2386 plen = 64;
2387 else
2388 plen = 96;
2389
2390 add_addr(idev, &addr, plen, flag);
2391 }
2392 }
2393 }
2394 }
2395 #endif
2396
2397 static void init_loopback(struct net_device *dev)
2398 {
2399 struct inet6_dev *idev;
2400
2401 /* ::1 */
2402
2403 ASSERT_RTNL();
2404
2405 if ((idev = ipv6_find_idev(dev)) == NULL) {
2406 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2407 return;
2408 }
2409
2410 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2411 }
2412
2413 static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr)
2414 {
2415 struct inet6_ifaddr *ifp;
2416 u32 addr_flags = IFA_F_PERMANENT;
2417
2418 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2419 if (idev->cnf.optimistic_dad &&
2420 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2421 addr_flags |= IFA_F_OPTIMISTIC;
2422 #endif
2423
2424
2425 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2426 if (!IS_ERR(ifp)) {
2427 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2428 addrconf_dad_start(ifp, 0);
2429 in6_ifa_put(ifp);
2430 }
2431 }
2432
2433 static void addrconf_dev_config(struct net_device *dev)
2434 {
2435 struct in6_addr addr;
2436 struct inet6_dev *idev;
2437
2438 ASSERT_RTNL();
2439
2440 if ((dev->type != ARPHRD_ETHER) &&
2441 (dev->type != ARPHRD_FDDI) &&
2442 (dev->type != ARPHRD_IEEE802_TR) &&
2443 (dev->type != ARPHRD_ARCNET) &&
2444 (dev->type != ARPHRD_INFINIBAND)) {
2445 /* Alas, we support only Ethernet autoconfiguration. */
2446 return;
2447 }
2448
2449 idev = addrconf_add_dev(dev);
2450 if (IS_ERR(idev))
2451 return;
2452
2453 memset(&addr, 0, sizeof(struct in6_addr));
2454 addr.s6_addr32[0] = htonl(0xFE800000);
2455
2456 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2457 addrconf_add_linklocal(idev, &addr);
2458 }
2459
2460 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2461 static void addrconf_sit_config(struct net_device *dev)
2462 {
2463 struct inet6_dev *idev;
2464
2465 ASSERT_RTNL();
2466
2467 /*
2468 * Configure the tunnel with one of our IPv4
2469 * addresses... we should configure all of
2470 * our v4 addrs in the tunnel
2471 */
2472
2473 if ((idev = ipv6_find_idev(dev)) == NULL) {
2474 printk(KERN_DEBUG "init sit: add_dev failed\n");
2475 return;
2476 }
2477
2478 if (dev->priv_flags & IFF_ISATAP) {
2479 struct in6_addr addr;
2480
2481 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2482 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2483 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2484 addrconf_add_linklocal(idev, &addr);
2485 return;
2486 }
2487
2488 sit_add_v4_addrs(idev);
2489
2490 if (dev->flags&IFF_POINTOPOINT) {
2491 addrconf_add_mroute(dev);
2492 addrconf_add_lroute(dev);
2493 } else
2494 sit_route_add(dev);
2495 }
2496 #endif
2497
2498 #if defined(CONFIG_NET_IPGRE) || defined(CONFIG_NET_IPGRE_MODULE)
2499 static void addrconf_gre_config(struct net_device *dev)
2500 {
2501 struct inet6_dev *idev;
2502 struct in6_addr addr;
2503
2504 pr_info("ipv6: addrconf_gre_config(%s)\n", dev->name);
2505
2506 ASSERT_RTNL();
2507
2508 if ((idev = ipv6_find_idev(dev)) == NULL) {
2509 printk(KERN_DEBUG "init gre: add_dev failed\n");
2510 return;
2511 }
2512
2513 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2514 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2515
2516 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2517 addrconf_add_linklocal(idev, &addr);
2518 }
2519 #endif
2520
2521 static inline int
2522 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2523 {
2524 struct in6_addr lladdr;
2525
2526 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2527 addrconf_add_linklocal(idev, &lladdr);
2528 return 0;
2529 }
2530 return -1;
2531 }
2532
2533 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2534 {
2535 struct net_device *link_dev;
2536 struct net *net = dev_net(idev->dev);
2537
2538 /* first try to inherit the link-local address from the link device */
2539 if (idev->dev->iflink &&
2540 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
2541 if (!ipv6_inherit_linklocal(idev, link_dev))
2542 return;
2543 }
2544 /* then try to inherit it from any device */
2545 for_each_netdev(net, link_dev) {
2546 if (!ipv6_inherit_linklocal(idev, link_dev))
2547 return;
2548 }
2549 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2550 }
2551
2552 /*
2553 * Autoconfigure tunnel with a link-local address so routing protocols,
2554 * DHCPv6, MLD etc. can be run over the virtual link
2555 */
2556
2557 static void addrconf_ip6_tnl_config(struct net_device *dev)
2558 {
2559 struct inet6_dev *idev;
2560
2561 ASSERT_RTNL();
2562
2563 idev = addrconf_add_dev(dev);
2564 if (IS_ERR(idev)) {
2565 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2566 return;
2567 }
2568 ip6_tnl_add_linklocal(idev);
2569 }
2570
2571 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2572 void *data)
2573 {
2574 struct net_device *dev = (struct net_device *) data;
2575 struct inet6_dev *idev = __in6_dev_get(dev);
2576 int run_pending = 0;
2577 int err;
2578
2579 switch (event) {
2580 case NETDEV_REGISTER:
2581 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2582 idev = ipv6_add_dev(dev);
2583 if (!idev)
2584 return notifier_from_errno(-ENOMEM);
2585 }
2586 break;
2587
2588 case NETDEV_UP:
2589 case NETDEV_CHANGE:
2590 if (dev->flags & IFF_SLAVE)
2591 break;
2592
2593 if (event == NETDEV_UP) {
2594 if (!addrconf_qdisc_ok(dev)) {
2595 /* device is not ready yet. */
2596 printk(KERN_INFO
2597 "ADDRCONF(NETDEV_UP): %s: "
2598 "link is not ready\n",
2599 dev->name);
2600 break;
2601 }
2602
2603 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2604 idev = ipv6_add_dev(dev);
2605
2606 if (idev) {
2607 idev->if_flags |= IF_READY;
2608 run_pending = 1;
2609 }
2610 } else {
2611 if (!addrconf_qdisc_ok(dev)) {
2612 /* device is still not ready. */
2613 break;
2614 }
2615
2616 if (idev) {
2617 if (idev->if_flags & IF_READY)
2618 /* device is already configured. */
2619 break;
2620 idev->if_flags |= IF_READY;
2621 }
2622
2623 printk(KERN_INFO
2624 "ADDRCONF(NETDEV_CHANGE): %s: "
2625 "link becomes ready\n",
2626 dev->name);
2627
2628 run_pending = 1;
2629 }
2630
2631 switch (dev->type) {
2632 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2633 case ARPHRD_SIT:
2634 addrconf_sit_config(dev);
2635 break;
2636 #endif
2637 #if defined(CONFIG_NET_IPGRE) || defined(CONFIG_NET_IPGRE_MODULE)
2638 case ARPHRD_IPGRE:
2639 addrconf_gre_config(dev);
2640 break;
2641 #endif
2642 case ARPHRD_TUNNEL6:
2643 addrconf_ip6_tnl_config(dev);
2644 break;
2645 case ARPHRD_LOOPBACK:
2646 init_loopback(dev);
2647 break;
2648
2649 default:
2650 addrconf_dev_config(dev);
2651 break;
2652 }
2653
2654 if (idev) {
2655 if (run_pending)
2656 addrconf_dad_run(idev);
2657
2658 /*
2659 * If the MTU changed during the interface down,
2660 * when the interface up, the changed MTU must be
2661 * reflected in the idev as well as routers.
2662 */
2663 if (idev->cnf.mtu6 != dev->mtu &&
2664 dev->mtu >= IPV6_MIN_MTU) {
2665 rt6_mtu_change(dev, dev->mtu);
2666 idev->cnf.mtu6 = dev->mtu;
2667 }
2668 idev->tstamp = jiffies;
2669 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2670
2671 /*
2672 * If the changed mtu during down is lower than
2673 * IPV6_MIN_MTU stop IPv6 on this interface.
2674 */
2675 if (dev->mtu < IPV6_MIN_MTU)
2676 addrconf_ifdown(dev, 1);
2677 }
2678 break;
2679
2680 case NETDEV_CHANGEMTU:
2681 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2682 rt6_mtu_change(dev, dev->mtu);
2683 idev->cnf.mtu6 = dev->mtu;
2684 break;
2685 }
2686
2687 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2688 idev = ipv6_add_dev(dev);
2689 if (idev)
2690 break;
2691 }
2692
2693 /*
2694 * MTU falled under IPV6_MIN_MTU.
2695 * Stop IPv6 on this interface.
2696 */
2697
2698 case NETDEV_DOWN:
2699 case NETDEV_UNREGISTER:
2700 /*
2701 * Remove all addresses from this interface.
2702 */
2703 addrconf_ifdown(dev, event != NETDEV_DOWN);
2704 break;
2705
2706 case NETDEV_CHANGENAME:
2707 if (idev) {
2708 snmp6_unregister_dev(idev);
2709 addrconf_sysctl_unregister(idev);
2710 addrconf_sysctl_register(idev);
2711 err = snmp6_register_dev(idev);
2712 if (err)
2713 return notifier_from_errno(err);
2714 }
2715 break;
2716
2717 case NETDEV_PRE_TYPE_CHANGE:
2718 case NETDEV_POST_TYPE_CHANGE:
2719 addrconf_type_change(dev, event);
2720 break;
2721 }
2722
2723 return NOTIFY_OK;
2724 }
2725
2726 /*
2727 * addrconf module should be notified of a device going up
2728 */
2729 static struct notifier_block ipv6_dev_notf = {
2730 .notifier_call = addrconf_notify,
2731 };
2732
2733 static void addrconf_type_change(struct net_device *dev, unsigned long event)
2734 {
2735 struct inet6_dev *idev;
2736 ASSERT_RTNL();
2737
2738 idev = __in6_dev_get(dev);
2739
2740 if (event == NETDEV_POST_TYPE_CHANGE)
2741 ipv6_mc_remap(idev);
2742 else if (event == NETDEV_PRE_TYPE_CHANGE)
2743 ipv6_mc_unmap(idev);
2744 }
2745
2746 static int addrconf_ifdown(struct net_device *dev, int how)
2747 {
2748 struct net *net = dev_net(dev);
2749 struct inet6_dev *idev;
2750 struct inet6_ifaddr *ifa;
2751 int state, i;
2752
2753 ASSERT_RTNL();
2754
2755 rt6_ifdown(net, dev);
2756 neigh_ifdown(&nd_tbl, dev);
2757
2758 idev = __in6_dev_get(dev);
2759 if (idev == NULL)
2760 return -ENODEV;
2761
2762 /*
2763 * Step 1: remove reference to ipv6 device from parent device.
2764 * Do not dev_put!
2765 */
2766 if (how) {
2767 idev->dead = 1;
2768
2769 /* protected by rtnl_lock */
2770 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
2771
2772 /* Step 1.5: remove snmp6 entry */
2773 snmp6_unregister_dev(idev);
2774
2775 }
2776
2777 /* Step 2: clear hash table */
2778 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
2779 struct hlist_head *h = &inet6_addr_lst[i];
2780 struct hlist_node *n;
2781
2782 spin_lock_bh(&addrconf_hash_lock);
2783 restart:
2784 hlist_for_each_entry_rcu(ifa, n, h, addr_lst) {
2785 if (ifa->idev == idev) {
2786 hlist_del_init_rcu(&ifa->addr_lst);
2787 addrconf_del_timer(ifa);
2788 goto restart;
2789 }
2790 }
2791 spin_unlock_bh(&addrconf_hash_lock);
2792 }
2793
2794 write_lock_bh(&idev->lock);
2795
2796 /* Step 2: clear flags for stateless addrconf */
2797 if (!how)
2798 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2799
2800 #ifdef CONFIG_IPV6_PRIVACY
2801 if (how && del_timer(&idev->regen_timer))
2802 in6_dev_put(idev);
2803
2804 /* Step 3: clear tempaddr list */
2805 while (!list_empty(&idev->tempaddr_list)) {
2806 ifa = list_first_entry(&idev->tempaddr_list,
2807 struct inet6_ifaddr, tmp_list);
2808 list_del(&ifa->tmp_list);
2809 write_unlock_bh(&idev->lock);
2810 spin_lock_bh(&ifa->lock);
2811
2812 if (ifa->ifpub) {
2813 in6_ifa_put(ifa->ifpub);
2814 ifa->ifpub = NULL;
2815 }
2816 spin_unlock_bh(&ifa->lock);
2817 in6_ifa_put(ifa);
2818 write_lock_bh(&idev->lock);
2819 }
2820 #endif
2821
2822 while (!list_empty(&idev->addr_list)) {
2823 ifa = list_first_entry(&idev->addr_list,
2824 struct inet6_ifaddr, if_list);
2825 addrconf_del_timer(ifa);
2826
2827 list_del(&ifa->if_list);
2828
2829 write_unlock_bh(&idev->lock);
2830
2831 spin_lock_bh(&ifa->state_lock);
2832 state = ifa->state;
2833 ifa->state = INET6_IFADDR_STATE_DEAD;
2834 spin_unlock_bh(&ifa->state_lock);
2835
2836 if (state != INET6_IFADDR_STATE_DEAD) {
2837 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2838 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2839 }
2840 in6_ifa_put(ifa);
2841
2842 write_lock_bh(&idev->lock);
2843 }
2844
2845 write_unlock_bh(&idev->lock);
2846
2847 /* Step 5: Discard multicast list */
2848 if (how)
2849 ipv6_mc_destroy_dev(idev);
2850 else
2851 ipv6_mc_down(idev);
2852
2853 idev->tstamp = jiffies;
2854
2855 /* Last: Shot the device (if unregistered) */
2856 if (how) {
2857 addrconf_sysctl_unregister(idev);
2858 neigh_parms_release(&nd_tbl, idev->nd_parms);
2859 neigh_ifdown(&nd_tbl, dev);
2860 in6_dev_put(idev);
2861 }
2862 return 0;
2863 }
2864
2865 static void addrconf_rs_timer(unsigned long data)
2866 {
2867 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2868 struct inet6_dev *idev = ifp->idev;
2869
2870 read_lock(&idev->lock);
2871 if (idev->dead || !(idev->if_flags & IF_READY))
2872 goto out;
2873
2874 if (idev->cnf.forwarding)
2875 goto out;
2876
2877 /* Announcement received after solicitation was sent */
2878 if (idev->if_flags & IF_RA_RCVD)
2879 goto out;
2880
2881 spin_lock(&ifp->lock);
2882 if (ifp->probes++ < idev->cnf.rtr_solicits) {
2883 /* The wait after the last probe can be shorter */
2884 addrconf_mod_timer(ifp, AC_RS,
2885 (ifp->probes == idev->cnf.rtr_solicits) ?
2886 idev->cnf.rtr_solicit_delay :
2887 idev->cnf.rtr_solicit_interval);
2888 spin_unlock(&ifp->lock);
2889
2890 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2891 } else {
2892 spin_unlock(&ifp->lock);
2893 /*
2894 * Note: we do not support deprecated "all on-link"
2895 * assumption any longer.
2896 */
2897 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2898 idev->dev->name);
2899 }
2900
2901 out:
2902 read_unlock(&idev->lock);
2903 in6_ifa_put(ifp);
2904 }
2905
2906 /*
2907 * Duplicate Address Detection
2908 */
2909 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2910 {
2911 unsigned long rand_num;
2912 struct inet6_dev *idev = ifp->idev;
2913
2914 if (ifp->flags & IFA_F_OPTIMISTIC)
2915 rand_num = 0;
2916 else
2917 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2918
2919 ifp->probes = idev->cnf.dad_transmits;
2920 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2921 }
2922
2923 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2924 {
2925 struct inet6_dev *idev = ifp->idev;
2926 struct net_device *dev = idev->dev;
2927
2928 addrconf_join_solict(dev, &ifp->addr);
2929
2930 net_srandom(ifp->addr.s6_addr32[3]);
2931
2932 read_lock_bh(&idev->lock);
2933 spin_lock(&ifp->lock);
2934 if (ifp->state == INET6_IFADDR_STATE_DEAD)
2935 goto out;
2936
2937 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2938 idev->cnf.accept_dad < 1 ||
2939 !(ifp->flags&IFA_F_TENTATIVE) ||
2940 ifp->flags & IFA_F_NODAD) {
2941 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
2942 spin_unlock(&ifp->lock);
2943 read_unlock_bh(&idev->lock);
2944
2945 addrconf_dad_completed(ifp);
2946 return;
2947 }
2948
2949 if (!(idev->if_flags & IF_READY)) {
2950 spin_unlock(&ifp->lock);
2951 read_unlock_bh(&idev->lock);
2952 /*
2953 * If the device is not ready:
2954 * - keep it tentative if it is a permanent address.
2955 * - otherwise, kill it.
2956 */
2957 in6_ifa_hold(ifp);
2958 addrconf_dad_stop(ifp, 0);
2959 return;
2960 }
2961
2962 /*
2963 * Optimistic nodes can start receiving
2964 * Frames right away
2965 */
2966 if (ifp->flags & IFA_F_OPTIMISTIC)
2967 ip6_ins_rt(ifp->rt);
2968
2969 addrconf_dad_kick(ifp);
2970 out:
2971 spin_unlock(&ifp->lock);
2972 read_unlock_bh(&idev->lock);
2973 }
2974
2975 static void addrconf_dad_timer(unsigned long data)
2976 {
2977 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2978 struct inet6_dev *idev = ifp->idev;
2979 struct in6_addr mcaddr;
2980
2981 if (!ifp->probes && addrconf_dad_end(ifp))
2982 goto out;
2983
2984 read_lock(&idev->lock);
2985 if (idev->dead || !(idev->if_flags & IF_READY)) {
2986 read_unlock(&idev->lock);
2987 goto out;
2988 }
2989
2990 spin_lock(&ifp->lock);
2991 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
2992 spin_unlock(&ifp->lock);
2993 read_unlock(&idev->lock);
2994 goto out;
2995 }
2996
2997 if (ifp->probes == 0) {
2998 /*
2999 * DAD was successful
3000 */
3001
3002 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3003 spin_unlock(&ifp->lock);
3004 read_unlock(&idev->lock);
3005
3006 addrconf_dad_completed(ifp);
3007
3008 goto out;
3009 }
3010
3011 ifp->probes--;
3012 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
3013 spin_unlock(&ifp->lock);
3014 read_unlock(&idev->lock);
3015
3016 /* send a neighbour solicitation for our addr */
3017 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3018 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
3019 out:
3020 in6_ifa_put(ifp);
3021 }
3022
3023 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3024 {
3025 struct net_device *dev = ifp->idev->dev;
3026
3027 /*
3028 * Configure the address for reception. Now it is valid.
3029 */
3030
3031 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3032
3033 /* If added prefix is link local and we are prepared to process
3034 router advertisements, start sending router solicitations.
3035 */
3036
3037 if (((ifp->idev->cnf.accept_ra == 1 && !ifp->idev->cnf.forwarding) ||
3038 ifp->idev->cnf.accept_ra == 2) &&
3039 ifp->idev->cnf.rtr_solicits > 0 &&
3040 (dev->flags&IFF_LOOPBACK) == 0 &&
3041 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
3042 /*
3043 * If a host as already performed a random delay
3044 * [...] as part of DAD [...] there is no need
3045 * to delay again before sending the first RS
3046 */
3047 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
3048
3049 spin_lock_bh(&ifp->lock);
3050 ifp->probes = 1;
3051 ifp->idev->if_flags |= IF_RS_SENT;
3052 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
3053 spin_unlock_bh(&ifp->lock);
3054 }
3055 }
3056
3057 static void addrconf_dad_run(struct inet6_dev *idev)
3058 {
3059 struct inet6_ifaddr *ifp;
3060
3061 read_lock_bh(&idev->lock);
3062 list_for_each_entry(ifp, &idev->addr_list, if_list) {
3063 spin_lock(&ifp->lock);
3064 if (ifp->flags & IFA_F_TENTATIVE &&
3065 ifp->state == INET6_IFADDR_STATE_DAD)
3066 addrconf_dad_kick(ifp);
3067 spin_unlock(&ifp->lock);
3068 }
3069 read_unlock_bh(&idev->lock);
3070 }
3071
3072 #ifdef CONFIG_PROC_FS
3073 struct if6_iter_state {
3074 struct seq_net_private p;
3075 int bucket;
3076 int offset;
3077 };
3078
3079 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
3080 {
3081 struct inet6_ifaddr *ifa = NULL;
3082 struct if6_iter_state *state = seq->private;
3083 struct net *net = seq_file_net(seq);
3084 int p = 0;
3085
3086 /* initial bucket if pos is 0 */
3087 if (pos == 0) {
3088 state->bucket = 0;
3089 state->offset = 0;
3090 }
3091
3092 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3093 struct hlist_node *n;
3094 hlist_for_each_entry_rcu_bh(ifa, n, &inet6_addr_lst[state->bucket],
3095 addr_lst) {
3096 /* sync with offset */
3097 if (p < state->offset) {
3098 p++;
3099 continue;
3100 }
3101 state->offset++;
3102 if (net_eq(dev_net(ifa->idev->dev), net))
3103 return ifa;
3104 }
3105
3106 /* prepare for next bucket */
3107 state->offset = 0;
3108 p = 0;
3109 }
3110 return NULL;
3111 }
3112
3113 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3114 struct inet6_ifaddr *ifa)
3115 {
3116 struct if6_iter_state *state = seq->private;
3117 struct net *net = seq_file_net(seq);
3118 struct hlist_node *n = &ifa->addr_lst;
3119
3120 hlist_for_each_entry_continue_rcu_bh(ifa, n, addr_lst) {
3121 state->offset++;
3122 if (net_eq(dev_net(ifa->idev->dev), net))
3123 return ifa;
3124 }
3125
3126 while (++state->bucket < IN6_ADDR_HSIZE) {
3127 state->offset = 0;
3128 hlist_for_each_entry_rcu_bh(ifa, n,
3129 &inet6_addr_lst[state->bucket], addr_lst) {
3130 state->offset++;
3131 if (net_eq(dev_net(ifa->idev->dev), net))
3132 return ifa;
3133 }
3134 }
3135
3136 return NULL;
3137 }
3138
3139 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3140 __acquires(rcu_bh)
3141 {
3142 rcu_read_lock_bh();
3143 return if6_get_first(seq, *pos);
3144 }
3145
3146 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3147 {
3148 struct inet6_ifaddr *ifa;
3149
3150 ifa = if6_get_next(seq, v);
3151 ++*pos;
3152 return ifa;
3153 }
3154
3155 static void if6_seq_stop(struct seq_file *seq, void *v)
3156 __releases(rcu_bh)
3157 {
3158 rcu_read_unlock_bh();
3159 }
3160
3161 static int if6_seq_show(struct seq_file *seq, void *v)
3162 {
3163 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3164 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3165 &ifp->addr,
3166 ifp->idev->dev->ifindex,
3167 ifp->prefix_len,
3168 ifp->scope,
3169 ifp->flags,
3170 ifp->idev->dev->name);
3171 return 0;
3172 }
3173
3174 static const struct seq_operations if6_seq_ops = {
3175 .start = if6_seq_start,
3176 .next = if6_seq_next,
3177 .show = if6_seq_show,
3178 .stop = if6_seq_stop,
3179 };
3180
3181 static int if6_seq_open(struct inode *inode, struct file *file)
3182 {
3183 return seq_open_net(inode, file, &if6_seq_ops,
3184 sizeof(struct if6_iter_state));
3185 }
3186
3187 static const struct file_operations if6_fops = {
3188 .owner = THIS_MODULE,
3189 .open = if6_seq_open,
3190 .read = seq_read,
3191 .llseek = seq_lseek,
3192 .release = seq_release_net,
3193 };
3194
3195 static int __net_init if6_proc_net_init(struct net *net)
3196 {
3197 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
3198 return -ENOMEM;
3199 return 0;
3200 }
3201
3202 static void __net_exit if6_proc_net_exit(struct net *net)
3203 {
3204 proc_net_remove(net, "if_inet6");
3205 }
3206
3207 static struct pernet_operations if6_proc_net_ops = {
3208 .init = if6_proc_net_init,
3209 .exit = if6_proc_net_exit,
3210 };
3211
3212 int __init if6_proc_init(void)
3213 {
3214 return register_pernet_subsys(&if6_proc_net_ops);
3215 }
3216
3217 void if6_proc_exit(void)
3218 {
3219 unregister_pernet_subsys(&if6_proc_net_ops);
3220 }
3221 #endif /* CONFIG_PROC_FS */
3222
3223 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3224 /* Check if address is a home address configured on any interface. */
3225 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3226 {
3227 int ret = 0;
3228 struct inet6_ifaddr *ifp = NULL;
3229 struct hlist_node *n;
3230 unsigned int hash = ipv6_addr_hash(addr);
3231
3232 rcu_read_lock_bh();
3233 hlist_for_each_entry_rcu_bh(ifp, n, &inet6_addr_lst[hash], addr_lst) {
3234 if (!net_eq(dev_net(ifp->idev->dev), net))
3235 continue;
3236 if (ipv6_addr_equal(&ifp->addr, addr) &&
3237 (ifp->flags & IFA_F_HOMEADDRESS)) {
3238 ret = 1;
3239 break;
3240 }
3241 }
3242 rcu_read_unlock_bh();
3243 return ret;
3244 }
3245 #endif
3246
3247 /*
3248 * Periodic address status verification
3249 */
3250
3251 static void addrconf_verify(unsigned long foo)
3252 {
3253 unsigned long now, next, next_sec, next_sched;
3254 struct inet6_ifaddr *ifp;
3255 struct hlist_node *node;
3256 int i;
3257
3258 rcu_read_lock_bh();
3259 spin_lock(&addrconf_verify_lock);
3260 now = jiffies;
3261 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3262
3263 del_timer(&addr_chk_timer);
3264
3265 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3266 restart:
3267 hlist_for_each_entry_rcu_bh(ifp, node,
3268 &inet6_addr_lst[i], addr_lst) {
3269 unsigned long age;
3270
3271 if (ifp->flags & IFA_F_PERMANENT)
3272 continue;
3273
3274 spin_lock(&ifp->lock);
3275 /* We try to batch several events at once. */
3276 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3277
3278 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3279 age >= ifp->valid_lft) {
3280 spin_unlock(&ifp->lock);
3281 in6_ifa_hold(ifp);
3282 ipv6_del_addr(ifp);
3283 goto restart;
3284 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3285 spin_unlock(&ifp->lock);
3286 continue;
3287 } else if (age >= ifp->prefered_lft) {
3288 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3289 int deprecate = 0;
3290
3291 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3292 deprecate = 1;
3293 ifp->flags |= IFA_F_DEPRECATED;
3294 }
3295
3296 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3297 next = ifp->tstamp + ifp->valid_lft * HZ;
3298
3299 spin_unlock(&ifp->lock);
3300
3301 if (deprecate) {
3302 in6_ifa_hold(ifp);
3303
3304 ipv6_ifa_notify(0, ifp);
3305 in6_ifa_put(ifp);
3306 goto restart;
3307 }
3308 #ifdef CONFIG_IPV6_PRIVACY
3309 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3310 !(ifp->flags&IFA_F_TENTATIVE)) {
3311 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3312 ifp->idev->cnf.dad_transmits *
3313 ifp->idev->nd_parms->retrans_time / HZ;
3314
3315 if (age >= ifp->prefered_lft - regen_advance) {
3316 struct inet6_ifaddr *ifpub = ifp->ifpub;
3317 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3318 next = ifp->tstamp + ifp->prefered_lft * HZ;
3319 if (!ifp->regen_count && ifpub) {
3320 ifp->regen_count++;
3321 in6_ifa_hold(ifp);
3322 in6_ifa_hold(ifpub);
3323 spin_unlock(&ifp->lock);
3324
3325 spin_lock(&ifpub->lock);
3326 ifpub->regen_count = 0;
3327 spin_unlock(&ifpub->lock);
3328 ipv6_create_tempaddr(ifpub, ifp);
3329 in6_ifa_put(ifpub);
3330 in6_ifa_put(ifp);
3331 goto restart;
3332 }
3333 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3334 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3335 spin_unlock(&ifp->lock);
3336 #endif
3337 } else {
3338 /* ifp->prefered_lft <= ifp->valid_lft */
3339 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3340 next = ifp->tstamp + ifp->prefered_lft * HZ;
3341 spin_unlock(&ifp->lock);
3342 }
3343 }
3344 }
3345
3346 next_sec = round_jiffies_up(next);
3347 next_sched = next;
3348
3349 /* If rounded timeout is accurate enough, accept it. */
3350 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3351 next_sched = next_sec;
3352
3353 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3354 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3355 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3356
3357 ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3358 now, next, next_sec, next_sched));
3359
3360 addr_chk_timer.expires = next_sched;
3361 add_timer(&addr_chk_timer);
3362 spin_unlock(&addrconf_verify_lock);
3363 rcu_read_unlock_bh();
3364 }
3365
3366 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3367 {
3368 struct in6_addr *pfx = NULL;
3369
3370 if (addr)
3371 pfx = nla_data(addr);
3372
3373 if (local) {
3374 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3375 pfx = NULL;
3376 else
3377 pfx = nla_data(local);
3378 }
3379
3380 return pfx;
3381 }
3382
3383 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3384 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3385 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3386 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3387 };
3388
3389 static int
3390 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3391 {
3392 struct net *net = sock_net(skb->sk);
3393 struct ifaddrmsg *ifm;
3394 struct nlattr *tb[IFA_MAX+1];
3395 struct in6_addr *pfx;
3396 int err;
3397
3398 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3399 if (err < 0)
3400 return err;
3401
3402 ifm = nlmsg_data(nlh);
3403 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3404 if (pfx == NULL)
3405 return -EINVAL;
3406
3407 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3408 }
3409
3410 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3411 u32 prefered_lft, u32 valid_lft)
3412 {
3413 u32 flags;
3414 clock_t expires;
3415 unsigned long timeout;
3416
3417 if (!valid_lft || (prefered_lft > valid_lft))
3418 return -EINVAL;
3419
3420 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3421 if (addrconf_finite_timeout(timeout)) {
3422 expires = jiffies_to_clock_t(timeout * HZ);
3423 valid_lft = timeout;
3424 flags = RTF_EXPIRES;
3425 } else {
3426 expires = 0;
3427 flags = 0;
3428 ifa_flags |= IFA_F_PERMANENT;
3429 }
3430
3431 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3432 if (addrconf_finite_timeout(timeout)) {
3433 if (timeout == 0)
3434 ifa_flags |= IFA_F_DEPRECATED;
3435 prefered_lft = timeout;
3436 }
3437
3438 spin_lock_bh(&ifp->lock);
3439 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3440 ifp->tstamp = jiffies;
3441 ifp->valid_lft = valid_lft;
3442 ifp->prefered_lft = prefered_lft;
3443
3444 spin_unlock_bh(&ifp->lock);
3445 if (!(ifp->flags&IFA_F_TENTATIVE))
3446 ipv6_ifa_notify(0, ifp);
3447
3448 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3449 expires, flags);
3450 addrconf_verify(0);
3451
3452 return 0;
3453 }
3454
3455 static int
3456 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3457 {
3458 struct net *net = sock_net(skb->sk);
3459 struct ifaddrmsg *ifm;
3460 struct nlattr *tb[IFA_MAX+1];
3461 struct in6_addr *pfx;
3462 struct inet6_ifaddr *ifa;
3463 struct net_device *dev;
3464 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3465 u8 ifa_flags;
3466 int err;
3467
3468 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3469 if (err < 0)
3470 return err;
3471
3472 ifm = nlmsg_data(nlh);
3473 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3474 if (pfx == NULL)
3475 return -EINVAL;
3476
3477 if (tb[IFA_CACHEINFO]) {
3478 struct ifa_cacheinfo *ci;
3479
3480 ci = nla_data(tb[IFA_CACHEINFO]);
3481 valid_lft = ci->ifa_valid;
3482 preferred_lft = ci->ifa_prefered;
3483 } else {
3484 preferred_lft = INFINITY_LIFE_TIME;
3485 valid_lft = INFINITY_LIFE_TIME;
3486 }
3487
3488 dev = __dev_get_by_index(net, ifm->ifa_index);
3489 if (dev == NULL)
3490 return -ENODEV;
3491
3492 /* We ignore other flags so far. */
3493 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3494
3495 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3496 if (ifa == NULL) {
3497 /*
3498 * It would be best to check for !NLM_F_CREATE here but
3499 * userspace alreay relies on not having to provide this.
3500 */
3501 return inet6_addr_add(net, ifm->ifa_index, pfx,
3502 ifm->ifa_prefixlen, ifa_flags,
3503 preferred_lft, valid_lft);
3504 }
3505
3506 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3507 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3508 err = -EEXIST;
3509 else
3510 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3511
3512 in6_ifa_put(ifa);
3513
3514 return err;
3515 }
3516
3517 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3518 u8 scope, int ifindex)
3519 {
3520 struct ifaddrmsg *ifm;
3521
3522 ifm = nlmsg_data(nlh);
3523 ifm->ifa_family = AF_INET6;
3524 ifm->ifa_prefixlen = prefixlen;
3525 ifm->ifa_flags = flags;
3526 ifm->ifa_scope = scope;
3527 ifm->ifa_index = ifindex;
3528 }
3529
3530 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3531 unsigned long tstamp, u32 preferred, u32 valid)
3532 {
3533 struct ifa_cacheinfo ci;
3534
3535 ci.cstamp = cstamp_delta(cstamp);
3536 ci.tstamp = cstamp_delta(tstamp);
3537 ci.ifa_prefered = preferred;
3538 ci.ifa_valid = valid;
3539
3540 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3541 }
3542
3543 static inline int rt_scope(int ifa_scope)
3544 {
3545 if (ifa_scope & IFA_HOST)
3546 return RT_SCOPE_HOST;
3547 else if (ifa_scope & IFA_LINK)
3548 return RT_SCOPE_LINK;
3549 else if (ifa_scope & IFA_SITE)
3550 return RT_SCOPE_SITE;
3551 else
3552 return RT_SCOPE_UNIVERSE;
3553 }
3554
3555 static inline int inet6_ifaddr_msgsize(void)
3556 {
3557 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3558 + nla_total_size(16) /* IFA_ADDRESS */
3559 + nla_total_size(sizeof(struct ifa_cacheinfo));
3560 }
3561
3562 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3563 u32 pid, u32 seq, int event, unsigned int flags)
3564 {
3565 struct nlmsghdr *nlh;
3566 u32 preferred, valid;
3567
3568 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3569 if (nlh == NULL)
3570 return -EMSGSIZE;
3571
3572 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3573 ifa->idev->dev->ifindex);
3574
3575 if (!(ifa->flags&IFA_F_PERMANENT)) {
3576 preferred = ifa->prefered_lft;
3577 valid = ifa->valid_lft;
3578 if (preferred != INFINITY_LIFE_TIME) {
3579 long tval = (jiffies - ifa->tstamp)/HZ;
3580 if (preferred > tval)
3581 preferred -= tval;
3582 else
3583 preferred = 0;
3584 if (valid != INFINITY_LIFE_TIME) {
3585 if (valid > tval)
3586 valid -= tval;
3587 else
3588 valid = 0;
3589 }
3590 }
3591 } else {
3592 preferred = INFINITY_LIFE_TIME;
3593 valid = INFINITY_LIFE_TIME;
3594 }
3595
3596 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3597 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3598 nlmsg_cancel(skb, nlh);
3599 return -EMSGSIZE;
3600 }
3601
3602 return nlmsg_end(skb, nlh);
3603 }
3604
3605 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3606 u32 pid, u32 seq, int event, u16 flags)
3607 {
3608 struct nlmsghdr *nlh;
3609 u8 scope = RT_SCOPE_UNIVERSE;
3610 int ifindex = ifmca->idev->dev->ifindex;
3611
3612 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3613 scope = RT_SCOPE_SITE;
3614
3615 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3616 if (nlh == NULL)
3617 return -EMSGSIZE;
3618
3619 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3620 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3621 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3622 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3623 nlmsg_cancel(skb, nlh);
3624 return -EMSGSIZE;
3625 }
3626
3627 return nlmsg_end(skb, nlh);
3628 }
3629
3630 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3631 u32 pid, u32 seq, int event, unsigned int flags)
3632 {
3633 struct nlmsghdr *nlh;
3634 u8 scope = RT_SCOPE_UNIVERSE;
3635 int ifindex = ifaca->aca_idev->dev->ifindex;
3636
3637 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3638 scope = RT_SCOPE_SITE;
3639
3640 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3641 if (nlh == NULL)
3642 return -EMSGSIZE;
3643
3644 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3645 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3646 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3647 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3648 nlmsg_cancel(skb, nlh);
3649 return -EMSGSIZE;
3650 }
3651
3652 return nlmsg_end(skb, nlh);
3653 }
3654
3655 enum addr_type_t {
3656 UNICAST_ADDR,
3657 MULTICAST_ADDR,
3658 ANYCAST_ADDR,
3659 };
3660
3661 /* called with rcu_read_lock() */
3662 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3663 struct netlink_callback *cb, enum addr_type_t type,
3664 int s_ip_idx, int *p_ip_idx)
3665 {
3666 struct ifmcaddr6 *ifmca;
3667 struct ifacaddr6 *ifaca;
3668 int err = 1;
3669 int ip_idx = *p_ip_idx;
3670
3671 read_lock_bh(&idev->lock);
3672 switch (type) {
3673 case UNICAST_ADDR: {
3674 struct inet6_ifaddr *ifa;
3675
3676 /* unicast address incl. temp addr */
3677 list_for_each_entry(ifa, &idev->addr_list, if_list) {
3678 if (++ip_idx < s_ip_idx)
3679 continue;
3680 err = inet6_fill_ifaddr(skb, ifa,
3681 NETLINK_CB(cb->skb).pid,
3682 cb->nlh->nlmsg_seq,
3683 RTM_NEWADDR,
3684 NLM_F_MULTI);
3685 if (err <= 0)
3686 break;
3687 }
3688 break;
3689 }
3690 case MULTICAST_ADDR:
3691 /* multicast address */
3692 for (ifmca = idev->mc_list; ifmca;
3693 ifmca = ifmca->next, ip_idx++) {
3694 if (ip_idx < s_ip_idx)
3695 continue;
3696 err = inet6_fill_ifmcaddr(skb, ifmca,
3697 NETLINK_CB(cb->skb).pid,
3698 cb->nlh->nlmsg_seq,
3699 RTM_GETMULTICAST,
3700 NLM_F_MULTI);
3701 if (err <= 0)
3702 break;
3703 }
3704 break;
3705 case ANYCAST_ADDR:
3706 /* anycast address */
3707 for (ifaca = idev->ac_list; ifaca;
3708 ifaca = ifaca->aca_next, ip_idx++) {
3709 if (ip_idx < s_ip_idx)
3710 continue;
3711 err = inet6_fill_ifacaddr(skb, ifaca,
3712 NETLINK_CB(cb->skb).pid,
3713 cb->nlh->nlmsg_seq,
3714 RTM_GETANYCAST,
3715 NLM_F_MULTI);
3716 if (err <= 0)
3717 break;
3718 }
3719 break;
3720 default:
3721 break;
3722 }
3723 read_unlock_bh(&idev->lock);
3724 *p_ip_idx = ip_idx;
3725 return err;
3726 }
3727
3728 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3729 enum addr_type_t type)
3730 {
3731 struct net *net = sock_net(skb->sk);
3732 int h, s_h;
3733 int idx, ip_idx;
3734 int s_idx, s_ip_idx;
3735 struct net_device *dev;
3736 struct inet6_dev *idev;
3737 struct hlist_head *head;
3738 struct hlist_node *node;
3739
3740 s_h = cb->args[0];
3741 s_idx = idx = cb->args[1];
3742 s_ip_idx = ip_idx = cb->args[2];
3743
3744 rcu_read_lock();
3745 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3746 idx = 0;
3747 head = &net->dev_index_head[h];
3748 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3749 if (idx < s_idx)
3750 goto cont;
3751 if (h > s_h || idx > s_idx)
3752 s_ip_idx = 0;
3753 ip_idx = 0;
3754 idev = __in6_dev_get(dev);
3755 if (!idev)
3756 goto cont;
3757
3758 if (in6_dump_addrs(idev, skb, cb, type,
3759 s_ip_idx, &ip_idx) <= 0)
3760 goto done;
3761 cont:
3762 idx++;
3763 }
3764 }
3765 done:
3766 rcu_read_unlock();
3767 cb->args[0] = h;
3768 cb->args[1] = idx;
3769 cb->args[2] = ip_idx;
3770
3771 return skb->len;
3772 }
3773
3774 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3775 {
3776 enum addr_type_t type = UNICAST_ADDR;
3777
3778 return inet6_dump_addr(skb, cb, type);
3779 }
3780
3781 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3782 {
3783 enum addr_type_t type = MULTICAST_ADDR;
3784
3785 return inet6_dump_addr(skb, cb, type);
3786 }
3787
3788
3789 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3790 {
3791 enum addr_type_t type = ANYCAST_ADDR;
3792
3793 return inet6_dump_addr(skb, cb, type);
3794 }
3795
3796 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
3797 void *arg)
3798 {
3799 struct net *net = sock_net(in_skb->sk);
3800 struct ifaddrmsg *ifm;
3801 struct nlattr *tb[IFA_MAX+1];
3802 struct in6_addr *addr = NULL;
3803 struct net_device *dev = NULL;
3804 struct inet6_ifaddr *ifa;
3805 struct sk_buff *skb;
3806 int err;
3807
3808 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3809 if (err < 0)
3810 goto errout;
3811
3812 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3813 if (addr == NULL) {
3814 err = -EINVAL;
3815 goto errout;
3816 }
3817
3818 ifm = nlmsg_data(nlh);
3819 if (ifm->ifa_index)
3820 dev = __dev_get_by_index(net, ifm->ifa_index);
3821
3822 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
3823 if (!ifa) {
3824 err = -EADDRNOTAVAIL;
3825 goto errout;
3826 }
3827
3828 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
3829 if (!skb) {
3830 err = -ENOBUFS;
3831 goto errout_ifa;
3832 }
3833
3834 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3835 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3836 if (err < 0) {
3837 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3838 WARN_ON(err == -EMSGSIZE);
3839 kfree_skb(skb);
3840 goto errout_ifa;
3841 }
3842 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
3843 errout_ifa:
3844 in6_ifa_put(ifa);
3845 errout:
3846 return err;
3847 }
3848
3849 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3850 {
3851 struct sk_buff *skb;
3852 struct net *net = dev_net(ifa->idev->dev);
3853 int err = -ENOBUFS;
3854
3855 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3856 if (skb == NULL)
3857 goto errout;
3858
3859 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3860 if (err < 0) {
3861 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3862 WARN_ON(err == -EMSGSIZE);
3863 kfree_skb(skb);
3864 goto errout;
3865 }
3866 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3867 return;
3868 errout:
3869 if (err < 0)
3870 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3871 }
3872
3873 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3874 __s32 *array, int bytes)
3875 {
3876 BUG_ON(bytes < (DEVCONF_MAX * 4));
3877
3878 memset(array, 0, bytes);
3879 array[DEVCONF_FORWARDING] = cnf->forwarding;
3880 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3881 array[DEVCONF_MTU6] = cnf->mtu6;
3882 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3883 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3884 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3885 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3886 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3887 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
3888 jiffies_to_msecs(cnf->rtr_solicit_interval);
3889 array[DEVCONF_RTR_SOLICIT_DELAY] =
3890 jiffies_to_msecs(cnf->rtr_solicit_delay);
3891 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3892 #ifdef CONFIG_IPV6_PRIVACY
3893 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3894 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3895 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3896 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3897 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3898 #endif
3899 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3900 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3901 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3902 #ifdef CONFIG_IPV6_ROUTER_PREF
3903 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3904 array[DEVCONF_RTR_PROBE_INTERVAL] =
3905 jiffies_to_msecs(cnf->rtr_probe_interval);
3906 #ifdef CONFIG_IPV6_ROUTE_INFO
3907 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3908 #endif
3909 #endif
3910 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3911 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3912 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3913 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3914 #endif
3915 #ifdef CONFIG_IPV6_MROUTE
3916 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
3917 #endif
3918 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
3919 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
3920 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
3921 }
3922
3923 static inline size_t inet6_ifla6_size(void)
3924 {
3925 return nla_total_size(4) /* IFLA_INET6_FLAGS */
3926 + nla_total_size(sizeof(struct ifla_cacheinfo))
3927 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3928 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3929 + nla_total_size(ICMP6_MIB_MAX * 8); /* IFLA_INET6_ICMP6STATS */
3930 }
3931
3932 static inline size_t inet6_if_nlmsg_size(void)
3933 {
3934 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3935 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3936 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3937 + nla_total_size(4) /* IFLA_MTU */
3938 + nla_total_size(4) /* IFLA_LINK */
3939 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
3940 }
3941
3942 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
3943 int items, int bytes)
3944 {
3945 int i;
3946 int pad = bytes - sizeof(u64) * items;
3947 BUG_ON(pad < 0);
3948
3949 /* Use put_unaligned() because stats may not be aligned for u64. */
3950 put_unaligned(items, &stats[0]);
3951 for (i = 1; i < items; i++)
3952 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
3953
3954 memset(&stats[items], 0, pad);
3955 }
3956
3957 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib,
3958 int items, int bytes, size_t syncpoff)
3959 {
3960 int i;
3961 int pad = bytes - sizeof(u64) * items;
3962 BUG_ON(pad < 0);
3963
3964 /* Use put_unaligned() because stats may not be aligned for u64. */
3965 put_unaligned(items, &stats[0]);
3966 for (i = 1; i < items; i++)
3967 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
3968
3969 memset(&stats[items], 0, pad);
3970 }
3971
3972 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3973 int bytes)
3974 {
3975 switch (attrtype) {
3976 case IFLA_INET6_STATS:
3977 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6,
3978 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
3979 break;
3980 case IFLA_INET6_ICMP6STATS:
3981 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
3982 break;
3983 }
3984 }
3985
3986 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
3987 {
3988 struct nlattr *nla;
3989 struct ifla_cacheinfo ci;
3990
3991 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
3992 goto nla_put_failure;
3993 ci.max_reasm_len = IPV6_MAXPLEN;
3994 ci.tstamp = cstamp_delta(idev->tstamp);
3995 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
3996 ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time);
3997 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
3998 goto nla_put_failure;
3999 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
4000 if (nla == NULL)
4001 goto nla_put_failure;
4002 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4003
4004 /* XXX - MC not implemented */
4005
4006 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4007 if (nla == NULL)
4008 goto nla_put_failure;
4009 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4010
4011 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4012 if (nla == NULL)
4013 goto nla_put_failure;
4014 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4015
4016 return 0;
4017
4018 nla_put_failure:
4019 return -EMSGSIZE;
4020 }
4021
4022 static size_t inet6_get_link_af_size(const struct net_device *dev)
4023 {
4024 if (!__in6_dev_get(dev))
4025 return 0;
4026
4027 return inet6_ifla6_size();
4028 }
4029
4030 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
4031 {
4032 struct inet6_dev *idev = __in6_dev_get(dev);
4033
4034 if (!idev)
4035 return -ENODATA;
4036
4037 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4038 return -EMSGSIZE;
4039
4040 return 0;
4041 }
4042
4043 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
4044 u32 pid, u32 seq, int event, unsigned int flags)
4045 {
4046 struct net_device *dev = idev->dev;
4047 struct ifinfomsg *hdr;
4048 struct nlmsghdr *nlh;
4049 void *protoinfo;
4050
4051 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
4052 if (nlh == NULL)
4053 return -EMSGSIZE;
4054
4055 hdr = nlmsg_data(nlh);
4056 hdr->ifi_family = AF_INET6;
4057 hdr->__ifi_pad = 0;
4058 hdr->ifi_type = dev->type;
4059 hdr->ifi_index = dev->ifindex;
4060 hdr->ifi_flags = dev_get_flags(dev);
4061 hdr->ifi_change = 0;
4062
4063 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4064 (dev->addr_len &&
4065 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4066 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4067 (dev->ifindex != dev->iflink &&
4068 nla_put_u32(skb, IFLA_LINK, dev->iflink)))
4069 goto nla_put_failure;
4070 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4071 if (protoinfo == NULL)
4072 goto nla_put_failure;
4073
4074 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4075 goto nla_put_failure;
4076
4077 nla_nest_end(skb, protoinfo);
4078 return nlmsg_end(skb, nlh);
4079
4080 nla_put_failure:
4081 nlmsg_cancel(skb, nlh);
4082 return -EMSGSIZE;
4083 }
4084
4085 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4086 {
4087 struct net *net = sock_net(skb->sk);
4088 int h, s_h;
4089 int idx = 0, s_idx;
4090 struct net_device *dev;
4091 struct inet6_dev *idev;
4092 struct hlist_head *head;
4093 struct hlist_node *node;
4094
4095 s_h = cb->args[0];
4096 s_idx = cb->args[1];
4097
4098 rcu_read_lock();
4099 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4100 idx = 0;
4101 head = &net->dev_index_head[h];
4102 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
4103 if (idx < s_idx)
4104 goto cont;
4105 idev = __in6_dev_get(dev);
4106 if (!idev)
4107 goto cont;
4108 if (inet6_fill_ifinfo(skb, idev,
4109 NETLINK_CB(cb->skb).pid,
4110 cb->nlh->nlmsg_seq,
4111 RTM_NEWLINK, NLM_F_MULTI) <= 0)
4112 goto out;
4113 cont:
4114 idx++;
4115 }
4116 }
4117 out:
4118 rcu_read_unlock();
4119 cb->args[1] = idx;
4120 cb->args[0] = h;
4121
4122 return skb->len;
4123 }
4124
4125 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4126 {
4127 struct sk_buff *skb;
4128 struct net *net = dev_net(idev->dev);
4129 int err = -ENOBUFS;
4130
4131 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
4132 if (skb == NULL)
4133 goto errout;
4134
4135 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
4136 if (err < 0) {
4137 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4138 WARN_ON(err == -EMSGSIZE);
4139 kfree_skb(skb);
4140 goto errout;
4141 }
4142 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
4143 return;
4144 errout:
4145 if (err < 0)
4146 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
4147 }
4148
4149 static inline size_t inet6_prefix_nlmsg_size(void)
4150 {
4151 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4152 + nla_total_size(sizeof(struct in6_addr))
4153 + nla_total_size(sizeof(struct prefix_cacheinfo));
4154 }
4155
4156 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
4157 struct prefix_info *pinfo, u32 pid, u32 seq,
4158 int event, unsigned int flags)
4159 {
4160 struct prefixmsg *pmsg;
4161 struct nlmsghdr *nlh;
4162 struct prefix_cacheinfo ci;
4163
4164 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
4165 if (nlh == NULL)
4166 return -EMSGSIZE;
4167
4168 pmsg = nlmsg_data(nlh);
4169 pmsg->prefix_family = AF_INET6;
4170 pmsg->prefix_pad1 = 0;
4171 pmsg->prefix_pad2 = 0;
4172 pmsg->prefix_ifindex = idev->dev->ifindex;
4173 pmsg->prefix_len = pinfo->prefix_len;
4174 pmsg->prefix_type = pinfo->type;
4175 pmsg->prefix_pad3 = 0;
4176 pmsg->prefix_flags = 0;
4177 if (pinfo->onlink)
4178 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4179 if (pinfo->autoconf)
4180 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4181
4182 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
4183 goto nla_put_failure;
4184 ci.preferred_time = ntohl(pinfo->prefered);
4185 ci.valid_time = ntohl(pinfo->valid);
4186 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
4187 goto nla_put_failure;
4188 return nlmsg_end(skb, nlh);
4189
4190 nla_put_failure:
4191 nlmsg_cancel(skb, nlh);
4192 return -EMSGSIZE;
4193 }
4194
4195 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
4196 struct prefix_info *pinfo)
4197 {
4198 struct sk_buff *skb;
4199 struct net *net = dev_net(idev->dev);
4200 int err = -ENOBUFS;
4201
4202 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
4203 if (skb == NULL)
4204 goto errout;
4205
4206 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
4207 if (err < 0) {
4208 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4209 WARN_ON(err == -EMSGSIZE);
4210 kfree_skb(skb);
4211 goto errout;
4212 }
4213 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4214 return;
4215 errout:
4216 if (err < 0)
4217 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
4218 }
4219
4220 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4221 {
4222 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4223
4224 switch (event) {
4225 case RTM_NEWADDR:
4226 /*
4227 * If the address was optimistic
4228 * we inserted the route at the start of
4229 * our DAD process, so we don't need
4230 * to do it again
4231 */
4232 if (!(ifp->rt->rt6i_node))
4233 ip6_ins_rt(ifp->rt);
4234 if (ifp->idev->cnf.forwarding)
4235 addrconf_join_anycast(ifp);
4236 break;
4237 case RTM_DELADDR:
4238 if (ifp->idev->cnf.forwarding)
4239 addrconf_leave_anycast(ifp);
4240 addrconf_leave_solict(ifp->idev, &ifp->addr);
4241 dst_hold(&ifp->rt->dst);
4242
4243 if (ip6_del_rt(ifp->rt))
4244 dst_free(&ifp->rt->dst);
4245 break;
4246 }
4247 }
4248
4249 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4250 {
4251 rcu_read_lock_bh();
4252 if (likely(ifp->idev->dead == 0))
4253 __ipv6_ifa_notify(event, ifp);
4254 rcu_read_unlock_bh();
4255 }
4256
4257 #ifdef CONFIG_SYSCTL
4258
4259 static
4260 int addrconf_sysctl_forward(ctl_table *ctl, int write,
4261 void __user *buffer, size_t *lenp, loff_t *ppos)
4262 {
4263 int *valp = ctl->data;
4264 int val = *valp;
4265 loff_t pos = *ppos;
4266 ctl_table lctl;
4267 int ret;
4268
4269 /*
4270 * ctl->data points to idev->cnf.forwarding, we should
4271 * not modify it until we get the rtnl lock.
4272 */
4273 lctl = *ctl;
4274 lctl.data = &val;
4275
4276 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4277
4278 if (write)
4279 ret = addrconf_fixup_forwarding(ctl, valp, val);
4280 if (ret)
4281 *ppos = pos;
4282 return ret;
4283 }
4284
4285 static void dev_disable_change(struct inet6_dev *idev)
4286 {
4287 if (!idev || !idev->dev)
4288 return;
4289
4290 if (idev->cnf.disable_ipv6)
4291 addrconf_notify(NULL, NETDEV_DOWN, idev->dev);
4292 else
4293 addrconf_notify(NULL, NETDEV_UP, idev->dev);
4294 }
4295
4296 static void addrconf_disable_change(struct net *net, __s32 newf)
4297 {
4298 struct net_device *dev;
4299 struct inet6_dev *idev;
4300
4301 rcu_read_lock();
4302 for_each_netdev_rcu(net, dev) {
4303 idev = __in6_dev_get(dev);
4304 if (idev) {
4305 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4306 idev->cnf.disable_ipv6 = newf;
4307 if (changed)
4308 dev_disable_change(idev);
4309 }
4310 }
4311 rcu_read_unlock();
4312 }
4313
4314 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
4315 {
4316 struct net *net;
4317 int old;
4318
4319 if (!rtnl_trylock())
4320 return restart_syscall();
4321
4322 net = (struct net *)table->extra2;
4323 old = *p;
4324 *p = newf;
4325
4326 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
4327 rtnl_unlock();
4328 return 0;
4329 }
4330
4331 if (p == &net->ipv6.devconf_all->disable_ipv6) {
4332 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4333 addrconf_disable_change(net, newf);
4334 } else if ((!newf) ^ (!old))
4335 dev_disable_change((struct inet6_dev *)table->extra1);
4336
4337 rtnl_unlock();
4338 return 0;
4339 }
4340
4341 static
4342 int addrconf_sysctl_disable(ctl_table *ctl, int write,
4343 void __user *buffer, size_t *lenp, loff_t *ppos)
4344 {
4345 int *valp = ctl->data;
4346 int val = *valp;
4347 loff_t pos = *ppos;
4348 ctl_table lctl;
4349 int ret;
4350
4351 /*
4352 * ctl->data points to idev->cnf.disable_ipv6, we should
4353 * not modify it until we get the rtnl lock.
4354 */
4355 lctl = *ctl;
4356 lctl.data = &val;
4357
4358 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4359
4360 if (write)
4361 ret = addrconf_disable_ipv6(ctl, valp, val);
4362 if (ret)
4363 *ppos = pos;
4364 return ret;
4365 }
4366
4367 static struct addrconf_sysctl_table
4368 {
4369 struct ctl_table_header *sysctl_header;
4370 ctl_table addrconf_vars[DEVCONF_MAX+1];
4371 char *dev_name;
4372 } addrconf_sysctl __read_mostly = {
4373 .sysctl_header = NULL,
4374 .addrconf_vars = {
4375 {
4376 .procname = "forwarding",
4377 .data = &ipv6_devconf.forwarding,
4378 .maxlen = sizeof(int),
4379 .mode = 0644,
4380 .proc_handler = addrconf_sysctl_forward,
4381 },
4382 {
4383 .procname = "hop_limit",
4384 .data = &ipv6_devconf.hop_limit,
4385 .maxlen = sizeof(int),
4386 .mode = 0644,
4387 .proc_handler = proc_dointvec,
4388 },
4389 {
4390 .procname = "mtu",
4391 .data = &ipv6_devconf.mtu6,
4392 .maxlen = sizeof(int),
4393 .mode = 0644,
4394 .proc_handler = proc_dointvec,
4395 },
4396 {
4397 .procname = "accept_ra",
4398 .data = &ipv6_devconf.accept_ra,
4399 .maxlen = sizeof(int),
4400 .mode = 0644,
4401 .proc_handler = proc_dointvec,
4402 },
4403 {
4404 .procname = "accept_redirects",
4405 .data = &ipv6_devconf.accept_redirects,
4406 .maxlen = sizeof(int),
4407 .mode = 0644,
4408 .proc_handler = proc_dointvec,
4409 },
4410 {
4411 .procname = "autoconf",
4412 .data = &ipv6_devconf.autoconf,
4413 .maxlen = sizeof(int),
4414 .mode = 0644,
4415 .proc_handler = proc_dointvec,
4416 },
4417 {
4418 .procname = "dad_transmits",
4419 .data = &ipv6_devconf.dad_transmits,
4420 .maxlen = sizeof(int),
4421 .mode = 0644,
4422 .proc_handler = proc_dointvec,
4423 },
4424 {
4425 .procname = "router_solicitations",
4426 .data = &ipv6_devconf.rtr_solicits,
4427 .maxlen = sizeof(int),
4428 .mode = 0644,
4429 .proc_handler = proc_dointvec,
4430 },
4431 {
4432 .procname = "router_solicitation_interval",
4433 .data = &ipv6_devconf.rtr_solicit_interval,
4434 .maxlen = sizeof(int),
4435 .mode = 0644,
4436 .proc_handler = proc_dointvec_jiffies,
4437 },
4438 {
4439 .procname = "router_solicitation_delay",
4440 .data = &ipv6_devconf.rtr_solicit_delay,
4441 .maxlen = sizeof(int),
4442 .mode = 0644,
4443 .proc_handler = proc_dointvec_jiffies,
4444 },
4445 {
4446 .procname = "force_mld_version",
4447 .data = &ipv6_devconf.force_mld_version,
4448 .maxlen = sizeof(int),
4449 .mode = 0644,
4450 .proc_handler = proc_dointvec,
4451 },
4452 #ifdef CONFIG_IPV6_PRIVACY
4453 {
4454 .procname = "use_tempaddr",
4455 .data = &ipv6_devconf.use_tempaddr,
4456 .maxlen = sizeof(int),
4457 .mode = 0644,
4458 .proc_handler = proc_dointvec,
4459 },
4460 {
4461 .procname = "temp_valid_lft",
4462 .data = &ipv6_devconf.temp_valid_lft,
4463 .maxlen = sizeof(int),
4464 .mode = 0644,
4465 .proc_handler = proc_dointvec,
4466 },
4467 {
4468 .procname = "temp_prefered_lft",
4469 .data = &ipv6_devconf.temp_prefered_lft,
4470 .maxlen = sizeof(int),
4471 .mode = 0644,
4472 .proc_handler = proc_dointvec,
4473 },
4474 {
4475 .procname = "regen_max_retry",
4476 .data = &ipv6_devconf.regen_max_retry,
4477 .maxlen = sizeof(int),
4478 .mode = 0644,
4479 .proc_handler = proc_dointvec,
4480 },
4481 {
4482 .procname = "max_desync_factor",
4483 .data = &ipv6_devconf.max_desync_factor,
4484 .maxlen = sizeof(int),
4485 .mode = 0644,
4486 .proc_handler = proc_dointvec,
4487 },
4488 #endif
4489 {
4490 .procname = "max_addresses",
4491 .data = &ipv6_devconf.max_addresses,
4492 .maxlen = sizeof(int),
4493 .mode = 0644,
4494 .proc_handler = proc_dointvec,
4495 },
4496 {
4497 .procname = "accept_ra_defrtr",
4498 .data = &ipv6_devconf.accept_ra_defrtr,
4499 .maxlen = sizeof(int),
4500 .mode = 0644,
4501 .proc_handler = proc_dointvec,
4502 },
4503 {
4504 .procname = "accept_ra_pinfo",
4505 .data = &ipv6_devconf.accept_ra_pinfo,
4506 .maxlen = sizeof(int),
4507 .mode = 0644,
4508 .proc_handler = proc_dointvec,
4509 },
4510 #ifdef CONFIG_IPV6_ROUTER_PREF
4511 {
4512 .procname = "accept_ra_rtr_pref",
4513 .data = &ipv6_devconf.accept_ra_rtr_pref,
4514 .maxlen = sizeof(int),
4515 .mode = 0644,
4516 .proc_handler = proc_dointvec,
4517 },
4518 {
4519 .procname = "router_probe_interval",
4520 .data = &ipv6_devconf.rtr_probe_interval,
4521 .maxlen = sizeof(int),
4522 .mode = 0644,
4523 .proc_handler = proc_dointvec_jiffies,
4524 },
4525 #ifdef CONFIG_IPV6_ROUTE_INFO
4526 {
4527 .procname = "accept_ra_rt_info_max_plen",
4528 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4529 .maxlen = sizeof(int),
4530 .mode = 0644,
4531 .proc_handler = proc_dointvec,
4532 },
4533 #endif
4534 #endif
4535 {
4536 .procname = "proxy_ndp",
4537 .data = &ipv6_devconf.proxy_ndp,
4538 .maxlen = sizeof(int),
4539 .mode = 0644,
4540 .proc_handler = proc_dointvec,
4541 },
4542 {
4543 .procname = "accept_source_route",
4544 .data = &ipv6_devconf.accept_source_route,
4545 .maxlen = sizeof(int),
4546 .mode = 0644,
4547 .proc_handler = proc_dointvec,
4548 },
4549 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4550 {
4551 .procname = "optimistic_dad",
4552 .data = &ipv6_devconf.optimistic_dad,
4553 .maxlen = sizeof(int),
4554 .mode = 0644,
4555 .proc_handler = proc_dointvec,
4556
4557 },
4558 #endif
4559 #ifdef CONFIG_IPV6_MROUTE
4560 {
4561 .procname = "mc_forwarding",
4562 .data = &ipv6_devconf.mc_forwarding,
4563 .maxlen = sizeof(int),
4564 .mode = 0444,
4565 .proc_handler = proc_dointvec,
4566 },
4567 #endif
4568 {
4569 .procname = "disable_ipv6",
4570 .data = &ipv6_devconf.disable_ipv6,
4571 .maxlen = sizeof(int),
4572 .mode = 0644,
4573 .proc_handler = addrconf_sysctl_disable,
4574 },
4575 {
4576 .procname = "accept_dad",
4577 .data = &ipv6_devconf.accept_dad,
4578 .maxlen = sizeof(int),
4579 .mode = 0644,
4580 .proc_handler = proc_dointvec,
4581 },
4582 {
4583 .procname = "force_tllao",
4584 .data = &ipv6_devconf.force_tllao,
4585 .maxlen = sizeof(int),
4586 .mode = 0644,
4587 .proc_handler = proc_dointvec
4588 },
4589 {
4590 /* sentinel */
4591 }
4592 },
4593 };
4594
4595 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4596 struct inet6_dev *idev, struct ipv6_devconf *p)
4597 {
4598 int i;
4599 struct addrconf_sysctl_table *t;
4600
4601 #define ADDRCONF_CTL_PATH_DEV 3
4602
4603 struct ctl_path addrconf_ctl_path[] = {
4604 { .procname = "net", },
4605 { .procname = "ipv6", },
4606 { .procname = "conf", },
4607 { /* to be set */ },
4608 { },
4609 };
4610
4611
4612 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4613 if (t == NULL)
4614 goto out;
4615
4616 for (i = 0; t->addrconf_vars[i].data; i++) {
4617 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
4618 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4619 t->addrconf_vars[i].extra2 = net;
4620 }
4621
4622 /*
4623 * Make a copy of dev_name, because '.procname' is regarded as const
4624 * by sysctl and we wouldn't want anyone to change it under our feet
4625 * (see SIOCSIFNAME).
4626 */
4627 t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4628 if (!t->dev_name)
4629 goto free;
4630
4631 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
4632
4633 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
4634 t->addrconf_vars);
4635 if (t->sysctl_header == NULL)
4636 goto free_procname;
4637
4638 p->sysctl = t;
4639 return 0;
4640
4641 free_procname:
4642 kfree(t->dev_name);
4643 free:
4644 kfree(t);
4645 out:
4646 return -ENOBUFS;
4647 }
4648
4649 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4650 {
4651 struct addrconf_sysctl_table *t;
4652
4653 if (p->sysctl == NULL)
4654 return;
4655
4656 t = p->sysctl;
4657 p->sysctl = NULL;
4658 unregister_net_sysctl_table(t->sysctl_header);
4659 kfree(t->dev_name);
4660 kfree(t);
4661 }
4662
4663 static void addrconf_sysctl_register(struct inet6_dev *idev)
4664 {
4665 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
4666 &ndisc_ifinfo_sysctl_change);
4667 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
4668 idev, &idev->cnf);
4669 }
4670
4671 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
4672 {
4673 __addrconf_sysctl_unregister(&idev->cnf);
4674 neigh_sysctl_unregister(idev->nd_parms);
4675 }
4676
4677
4678 #endif
4679
4680 static int __net_init addrconf_init_net(struct net *net)
4681 {
4682 int err;
4683 struct ipv6_devconf *all, *dflt;
4684
4685 err = -ENOMEM;
4686 all = &ipv6_devconf;
4687 dflt = &ipv6_devconf_dflt;
4688
4689 if (!net_eq(net, &init_net)) {
4690 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4691 if (all == NULL)
4692 goto err_alloc_all;
4693
4694 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4695 if (dflt == NULL)
4696 goto err_alloc_dflt;
4697 } else {
4698 /* these will be inherited by all namespaces */
4699 dflt->autoconf = ipv6_defaults.autoconf;
4700 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
4701 }
4702
4703 net->ipv6.devconf_all = all;
4704 net->ipv6.devconf_dflt = dflt;
4705
4706 #ifdef CONFIG_SYSCTL
4707 err = __addrconf_sysctl_register(net, "all", NULL, all);
4708 if (err < 0)
4709 goto err_reg_all;
4710
4711 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
4712 if (err < 0)
4713 goto err_reg_dflt;
4714 #endif
4715 return 0;
4716
4717 #ifdef CONFIG_SYSCTL
4718 err_reg_dflt:
4719 __addrconf_sysctl_unregister(all);
4720 err_reg_all:
4721 kfree(dflt);
4722 #endif
4723 err_alloc_dflt:
4724 kfree(all);
4725 err_alloc_all:
4726 return err;
4727 }
4728
4729 static void __net_exit addrconf_exit_net(struct net *net)
4730 {
4731 #ifdef CONFIG_SYSCTL
4732 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4733 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4734 #endif
4735 if (!net_eq(net, &init_net)) {
4736 kfree(net->ipv6.devconf_dflt);
4737 kfree(net->ipv6.devconf_all);
4738 }
4739 }
4740
4741 static struct pernet_operations addrconf_ops = {
4742 .init = addrconf_init_net,
4743 .exit = addrconf_exit_net,
4744 };
4745
4746 /*
4747 * Device notifier
4748 */
4749
4750 int register_inet6addr_notifier(struct notifier_block *nb)
4751 {
4752 return atomic_notifier_chain_register(&inet6addr_chain, nb);
4753 }
4754 EXPORT_SYMBOL(register_inet6addr_notifier);
4755
4756 int unregister_inet6addr_notifier(struct notifier_block *nb)
4757 {
4758 return atomic_notifier_chain_unregister(&inet6addr_chain, nb);
4759 }
4760 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4761
4762 static struct rtnl_af_ops inet6_ops = {
4763 .family = AF_INET6,
4764 .fill_link_af = inet6_fill_link_af,
4765 .get_link_af_size = inet6_get_link_af_size,
4766 };
4767
4768 /*
4769 * Init / cleanup code
4770 */
4771
4772 int __init addrconf_init(void)
4773 {
4774 int i, err;
4775
4776 err = ipv6_addr_label_init();
4777 if (err < 0) {
4778 printk(KERN_CRIT "IPv6 Addrconf:"
4779 " cannot initialize default policy table: %d.\n", err);
4780 goto out;
4781 }
4782
4783 err = register_pernet_subsys(&addrconf_ops);
4784 if (err < 0)
4785 goto out_addrlabel;
4786
4787 /* The addrconf netdev notifier requires that loopback_dev
4788 * has it's ipv6 private information allocated and setup
4789 * before it can bring up and give link-local addresses
4790 * to other devices which are up.
4791 *
4792 * Unfortunately, loopback_dev is not necessarily the first
4793 * entry in the global dev_base list of net devices. In fact,
4794 * it is likely to be the very last entry on that list.
4795 * So this causes the notifier registry below to try and
4796 * give link-local addresses to all devices besides loopback_dev
4797 * first, then loopback_dev, which cases all the non-loopback_dev
4798 * devices to fail to get a link-local address.
4799 *
4800 * So, as a temporary fix, allocate the ipv6 structure for
4801 * loopback_dev first by hand.
4802 * Longer term, all of the dependencies ipv6 has upon the loopback
4803 * device and it being up should be removed.
4804 */
4805 rtnl_lock();
4806 if (!ipv6_add_dev(init_net.loopback_dev))
4807 err = -ENOMEM;
4808 rtnl_unlock();
4809 if (err)
4810 goto errlo;
4811
4812 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4813 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
4814
4815 register_netdevice_notifier(&ipv6_dev_notf);
4816
4817 addrconf_verify(0);
4818
4819 err = rtnl_af_register(&inet6_ops);
4820 if (err < 0)
4821 goto errout_af;
4822
4823 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
4824 NULL);
4825 if (err < 0)
4826 goto errout;
4827
4828 /* Only the first call to __rtnl_register can fail */
4829 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
4830 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
4831 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
4832 inet6_dump_ifaddr, NULL);
4833 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
4834 inet6_dump_ifmcaddr, NULL);
4835 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
4836 inet6_dump_ifacaddr, NULL);
4837
4838 ipv6_addr_label_rtnl_register();
4839
4840 return 0;
4841 errout:
4842 rtnl_af_unregister(&inet6_ops);
4843 errout_af:
4844 unregister_netdevice_notifier(&ipv6_dev_notf);
4845 errlo:
4846 unregister_pernet_subsys(&addrconf_ops);
4847 out_addrlabel:
4848 ipv6_addr_label_cleanup();
4849 out:
4850 return err;
4851 }
4852
4853 void addrconf_cleanup(void)
4854 {
4855 struct net_device *dev;
4856 int i;
4857
4858 unregister_netdevice_notifier(&ipv6_dev_notf);
4859 unregister_pernet_subsys(&addrconf_ops);
4860 ipv6_addr_label_cleanup();
4861
4862 rtnl_lock();
4863
4864 __rtnl_af_unregister(&inet6_ops);
4865
4866 /* clean dev list */
4867 for_each_netdev(&init_net, dev) {
4868 if (__in6_dev_get(dev) == NULL)
4869 continue;
4870 addrconf_ifdown(dev, 1);
4871 }
4872 addrconf_ifdown(init_net.loopback_dev, 2);
4873
4874 /*
4875 * Check hash table.
4876 */
4877 spin_lock_bh(&addrconf_hash_lock);
4878 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4879 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
4880 spin_unlock_bh(&addrconf_hash_lock);
4881
4882 del_timer(&addr_chk_timer);
4883 rtnl_unlock();
4884 }
Linux kernel - Deliverables
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