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Merge branch 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab...
[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 #define pr_fmt(fmt) "IPv6: " fmt
42
43 #include <linux/errno.h>
44 #include <linux/types.h>
45 #include <linux/kernel.h>
46 #include <linux/socket.h>
47 #include <linux/sockios.h>
48 #include <linux/net.h>
49 #include <linux/in6.h>
50 #include <linux/netdevice.h>
51 #include <linux/if_addr.h>
52 #include <linux/if_arp.h>
53 #include <linux/if_arcnet.h>
54 #include <linux/if_infiniband.h>
55 #include <linux/route.h>
56 #include <linux/inetdevice.h>
57 #include <linux/init.h>
58 #include <linux/slab.h>
59 #ifdef CONFIG_SYSCTL
60 #include <linux/sysctl.h>
61 #endif
62 #include <linux/capability.h>
63 #include <linux/delay.h>
64 #include <linux/notifier.h>
65 #include <linux/string.h>
66 #include <linux/hash.h>
67
68 #include <net/net_namespace.h>
69 #include <net/sock.h>
70 #include <net/snmp.h>
71
72 #include <net/af_ieee802154.h>
73 #include <net/ipv6.h>
74 #include <net/protocol.h>
75 #include <net/ndisc.h>
76 #include <net/ip6_route.h>
77 #include <net/addrconf.h>
78 #include <net/tcp.h>
79 #include <net/ip.h>
80 #include <net/netlink.h>
81 #include <net/pkt_sched.h>
82 #include <linux/if_tunnel.h>
83 #include <linux/rtnetlink.h>
84
85 #ifdef CONFIG_IPV6_PRIVACY
86 #include <linux/random.h>
87 #endif
88
89 #include <linux/uaccess.h>
90 #include <asm/unaligned.h>
91
92 #include <linux/proc_fs.h>
93 #include <linux/seq_file.h>
94 #include <linux/export.h>
95
96 /* Set to 3 to get tracing... */
97 #define ACONF_DEBUG 2
98
99 #if ACONF_DEBUG >= 3
100 #define ADBG(x) printk x
101 #else
102 #define ADBG(x)
103 #endif
104
105 #define INFINITY_LIFE_TIME 0xFFFFFFFF
106
107 static inline u32 cstamp_delta(unsigned long cstamp)
108 {
109 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
110 }
111
112 #define ADDRCONF_TIMER_FUZZ_MINUS (HZ > 50 ? HZ/50 : 1)
113 #define ADDRCONF_TIMER_FUZZ (HZ / 4)
114 #define ADDRCONF_TIMER_FUZZ_MAX (HZ)
115
116 #ifdef CONFIG_SYSCTL
117 static void addrconf_sysctl_register(struct inet6_dev *idev);
118 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
119 #else
120 static inline void addrconf_sysctl_register(struct inet6_dev *idev)
121 {
122 }
123
124 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
125 {
126 }
127 #endif
128
129 #ifdef CONFIG_IPV6_PRIVACY
130 static int __ipv6_regen_rndid(struct inet6_dev *idev);
131 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
132 static void ipv6_regen_rndid(unsigned long data);
133 #endif
134
135 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
136 static int ipv6_count_addresses(struct inet6_dev *idev);
137
138 /*
139 * Configured unicast address hash table
140 */
141 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
142 static DEFINE_SPINLOCK(addrconf_hash_lock);
143
144 static void addrconf_verify(unsigned long);
145
146 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
147 static DEFINE_SPINLOCK(addrconf_verify_lock);
148
149 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
150 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
151
152 static void addrconf_type_change(struct net_device *dev,
153 unsigned long event);
154 static int addrconf_ifdown(struct net_device *dev, int how);
155
156 static void addrconf_dad_start(struct inet6_ifaddr *ifp);
157 static void addrconf_dad_timer(unsigned long data);
158 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
159 static void addrconf_dad_run(struct inet6_dev *idev);
160 static void addrconf_rs_timer(unsigned long data);
161 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
162 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
163
164 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
165 struct prefix_info *pinfo);
166 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
167 struct net_device *dev);
168
169 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
170
171 static struct ipv6_devconf ipv6_devconf __read_mostly = {
172 .forwarding = 0,
173 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
174 .mtu6 = IPV6_MIN_MTU,
175 .accept_ra = 1,
176 .accept_redirects = 1,
177 .autoconf = 1,
178 .force_mld_version = 0,
179 .dad_transmits = 1,
180 .rtr_solicits = MAX_RTR_SOLICITATIONS,
181 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
182 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
183 #ifdef CONFIG_IPV6_PRIVACY
184 .use_tempaddr = 0,
185 .temp_valid_lft = TEMP_VALID_LIFETIME,
186 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
187 .regen_max_retry = REGEN_MAX_RETRY,
188 .max_desync_factor = MAX_DESYNC_FACTOR,
189 #endif
190 .max_addresses = IPV6_MAX_ADDRESSES,
191 .accept_ra_defrtr = 1,
192 .accept_ra_pinfo = 1,
193 #ifdef CONFIG_IPV6_ROUTER_PREF
194 .accept_ra_rtr_pref = 1,
195 .rtr_probe_interval = 60 * HZ,
196 #ifdef CONFIG_IPV6_ROUTE_INFO
197 .accept_ra_rt_info_max_plen = 0,
198 #endif
199 #endif
200 .proxy_ndp = 0,
201 .accept_source_route = 0, /* we do not accept RH0 by default. */
202 .disable_ipv6 = 0,
203 .accept_dad = 1,
204 };
205
206 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
207 .forwarding = 0,
208 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
209 .mtu6 = IPV6_MIN_MTU,
210 .accept_ra = 1,
211 .accept_redirects = 1,
212 .autoconf = 1,
213 .dad_transmits = 1,
214 .rtr_solicits = MAX_RTR_SOLICITATIONS,
215 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
216 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
217 #ifdef CONFIG_IPV6_PRIVACY
218 .use_tempaddr = 0,
219 .temp_valid_lft = TEMP_VALID_LIFETIME,
220 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
221 .regen_max_retry = REGEN_MAX_RETRY,
222 .max_desync_factor = MAX_DESYNC_FACTOR,
223 #endif
224 .max_addresses = IPV6_MAX_ADDRESSES,
225 .accept_ra_defrtr = 1,
226 .accept_ra_pinfo = 1,
227 #ifdef CONFIG_IPV6_ROUTER_PREF
228 .accept_ra_rtr_pref = 1,
229 .rtr_probe_interval = 60 * HZ,
230 #ifdef CONFIG_IPV6_ROUTE_INFO
231 .accept_ra_rt_info_max_plen = 0,
232 #endif
233 #endif
234 .proxy_ndp = 0,
235 .accept_source_route = 0, /* we do not accept RH0 by default. */
236 .disable_ipv6 = 0,
237 .accept_dad = 1,
238 };
239
240 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
241 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
242 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
243 const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
244 const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
245
246 /* Check if a valid qdisc is available */
247 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
248 {
249 return !qdisc_tx_is_noop(dev);
250 }
251
252 /* Check if a route is valid prefix route */
253 static inline int addrconf_is_prefix_route(const struct rt6_info *rt)
254 {
255 return (rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0;
256 }
257
258 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
259 {
260 if (del_timer(&ifp->timer))
261 __in6_ifa_put(ifp);
262 }
263
264 enum addrconf_timer_t {
265 AC_NONE,
266 AC_DAD,
267 AC_RS,
268 };
269
270 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
271 enum addrconf_timer_t what,
272 unsigned long when)
273 {
274 if (!del_timer(&ifp->timer))
275 in6_ifa_hold(ifp);
276
277 switch (what) {
278 case AC_DAD:
279 ifp->timer.function = addrconf_dad_timer;
280 break;
281 case AC_RS:
282 ifp->timer.function = addrconf_rs_timer;
283 break;
284 default:
285 break;
286 }
287 ifp->timer.expires = jiffies + when;
288 add_timer(&ifp->timer);
289 }
290
291 static int snmp6_alloc_dev(struct inet6_dev *idev)
292 {
293 if (snmp_mib_init((void __percpu **)idev->stats.ipv6,
294 sizeof(struct ipstats_mib),
295 __alignof__(struct ipstats_mib)) < 0)
296 goto err_ip;
297 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
298 GFP_KERNEL);
299 if (!idev->stats.icmpv6dev)
300 goto err_icmp;
301 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
302 GFP_KERNEL);
303 if (!idev->stats.icmpv6msgdev)
304 goto err_icmpmsg;
305
306 return 0;
307
308 err_icmpmsg:
309 kfree(idev->stats.icmpv6dev);
310 err_icmp:
311 snmp_mib_free((void __percpu **)idev->stats.ipv6);
312 err_ip:
313 return -ENOMEM;
314 }
315
316 static void snmp6_free_dev(struct inet6_dev *idev)
317 {
318 kfree(idev->stats.icmpv6msgdev);
319 kfree(idev->stats.icmpv6dev);
320 snmp_mib_free((void __percpu **)idev->stats.ipv6);
321 }
322
323 /* Nobody refers to this device, we may destroy it. */
324
325 void in6_dev_finish_destroy(struct inet6_dev *idev)
326 {
327 struct net_device *dev = idev->dev;
328
329 WARN_ON(!list_empty(&idev->addr_list));
330 WARN_ON(idev->mc_list != NULL);
331
332 #ifdef NET_REFCNT_DEBUG
333 pr_debug("%s: %s\n", __func__, dev ? dev->name : "NIL");
334 #endif
335 dev_put(dev);
336 if (!idev->dead) {
337 pr_warn("Freeing alive inet6 device %p\n", idev);
338 return;
339 }
340 snmp6_free_dev(idev);
341 kfree_rcu(idev, rcu);
342 }
343 EXPORT_SYMBOL(in6_dev_finish_destroy);
344
345 static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
346 {
347 struct inet6_dev *ndev;
348
349 ASSERT_RTNL();
350
351 if (dev->mtu < IPV6_MIN_MTU)
352 return NULL;
353
354 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
355
356 if (ndev == NULL)
357 return NULL;
358
359 rwlock_init(&ndev->lock);
360 ndev->dev = dev;
361 INIT_LIST_HEAD(&ndev->addr_list);
362
363 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
364 ndev->cnf.mtu6 = dev->mtu;
365 ndev->cnf.sysctl = NULL;
366 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
367 if (ndev->nd_parms == NULL) {
368 kfree(ndev);
369 return NULL;
370 }
371 if (ndev->cnf.forwarding)
372 dev_disable_lro(dev);
373 /* We refer to the device */
374 dev_hold(dev);
375
376 if (snmp6_alloc_dev(ndev) < 0) {
377 ADBG((KERN_WARNING
378 "%s: cannot allocate memory for statistics; dev=%s.\n",
379 __func__, dev->name));
380 neigh_parms_release(&nd_tbl, ndev->nd_parms);
381 dev_put(dev);
382 kfree(ndev);
383 return NULL;
384 }
385
386 if (snmp6_register_dev(ndev) < 0) {
387 ADBG((KERN_WARNING
388 "%s: cannot create /proc/net/dev_snmp6/%s\n",
389 __func__, dev->name));
390 neigh_parms_release(&nd_tbl, ndev->nd_parms);
391 ndev->dead = 1;
392 in6_dev_finish_destroy(ndev);
393 return NULL;
394 }
395
396 /* One reference from device. We must do this before
397 * we invoke __ipv6_regen_rndid().
398 */
399 in6_dev_hold(ndev);
400
401 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
402 ndev->cnf.accept_dad = -1;
403
404 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
405 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
406 pr_info("%s: Disabled Multicast RS\n", dev->name);
407 ndev->cnf.rtr_solicits = 0;
408 }
409 #endif
410
411 #ifdef CONFIG_IPV6_PRIVACY
412 INIT_LIST_HEAD(&ndev->tempaddr_list);
413 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
414 if ((dev->flags&IFF_LOOPBACK) ||
415 dev->type == ARPHRD_TUNNEL ||
416 dev->type == ARPHRD_TUNNEL6 ||
417 dev->type == ARPHRD_SIT ||
418 dev->type == ARPHRD_NONE) {
419 ndev->cnf.use_tempaddr = -1;
420 } else {
421 in6_dev_hold(ndev);
422 ipv6_regen_rndid((unsigned long) ndev);
423 }
424 #endif
425
426 if (netif_running(dev) && addrconf_qdisc_ok(dev))
427 ndev->if_flags |= IF_READY;
428
429 ipv6_mc_init_dev(ndev);
430 ndev->tstamp = jiffies;
431 addrconf_sysctl_register(ndev);
432 /* protected by rtnl_lock */
433 rcu_assign_pointer(dev->ip6_ptr, ndev);
434
435 /* Join all-node multicast group */
436 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
437
438 /* Join all-router multicast group if forwarding is set */
439 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
440 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
441
442 return ndev;
443 }
444
445 static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
446 {
447 struct inet6_dev *idev;
448
449 ASSERT_RTNL();
450
451 idev = __in6_dev_get(dev);
452 if (!idev) {
453 idev = ipv6_add_dev(dev);
454 if (!idev)
455 return NULL;
456 }
457
458 if (dev->flags&IFF_UP)
459 ipv6_mc_up(idev);
460 return idev;
461 }
462
463 #ifdef CONFIG_SYSCTL
464 static void dev_forward_change(struct inet6_dev *idev)
465 {
466 struct net_device *dev;
467 struct inet6_ifaddr *ifa;
468
469 if (!idev)
470 return;
471 dev = idev->dev;
472 if (idev->cnf.forwarding)
473 dev_disable_lro(dev);
474 if (dev && (dev->flags & IFF_MULTICAST)) {
475 if (idev->cnf.forwarding)
476 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
477 else
478 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
479 }
480
481 list_for_each_entry(ifa, &idev->addr_list, if_list) {
482 if (ifa->flags&IFA_F_TENTATIVE)
483 continue;
484 if (idev->cnf.forwarding)
485 addrconf_join_anycast(ifa);
486 else
487 addrconf_leave_anycast(ifa);
488 }
489 }
490
491
492 static void addrconf_forward_change(struct net *net, __s32 newf)
493 {
494 struct net_device *dev;
495 struct inet6_dev *idev;
496
497 for_each_netdev(net, dev) {
498 idev = __in6_dev_get(dev);
499 if (idev) {
500 int changed = (!idev->cnf.forwarding) ^ (!newf);
501 idev->cnf.forwarding = newf;
502 if (changed)
503 dev_forward_change(idev);
504 }
505 }
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 pr_debug("%s\n", __func__);
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_warn("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 inet6_addr_hash(const struct in6_addr *addr)
582 {
583 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
584 }
585
586 /* On success it returns ifp with increased reference count */
587
588 static struct inet6_ifaddr *
589 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
590 int scope, u32 flags)
591 {
592 struct inet6_ifaddr *ifa = NULL;
593 struct rt6_info *rt;
594 unsigned int hash;
595 int err = 0;
596 int addr_type = ipv6_addr_type(addr);
597
598 if (addr_type == IPV6_ADDR_ANY ||
599 addr_type & IPV6_ADDR_MULTICAST ||
600 (!(idev->dev->flags & IFF_LOOPBACK) &&
601 addr_type & IPV6_ADDR_LOOPBACK))
602 return ERR_PTR(-EADDRNOTAVAIL);
603
604 rcu_read_lock_bh();
605 if (idev->dead) {
606 err = -ENODEV; /*XXX*/
607 goto out2;
608 }
609
610 if (idev->cnf.disable_ipv6) {
611 err = -EACCES;
612 goto out2;
613 }
614
615 spin_lock(&addrconf_hash_lock);
616
617 /* Ignore adding duplicate addresses on an interface */
618 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
619 ADBG(("ipv6_add_addr: already assigned\n"));
620 err = -EEXIST;
621 goto out;
622 }
623
624 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
625
626 if (ifa == NULL) {
627 ADBG(("ipv6_add_addr: malloc failed\n"));
628 err = -ENOBUFS;
629 goto out;
630 }
631
632 rt = addrconf_dst_alloc(idev, addr, false);
633 if (IS_ERR(rt)) {
634 err = PTR_ERR(rt);
635 goto out;
636 }
637
638 ifa->addr = *addr;
639
640 spin_lock_init(&ifa->lock);
641 spin_lock_init(&ifa->state_lock);
642 init_timer(&ifa->timer);
643 INIT_HLIST_NODE(&ifa->addr_lst);
644 ifa->timer.data = (unsigned long) ifa;
645 ifa->scope = scope;
646 ifa->prefix_len = pfxlen;
647 ifa->flags = flags | IFA_F_TENTATIVE;
648 ifa->cstamp = ifa->tstamp = jiffies;
649
650 ifa->rt = rt;
651
652 ifa->idev = idev;
653 in6_dev_hold(idev);
654 /* For caller */
655 in6_ifa_hold(ifa);
656
657 /* Add to big hash table */
658 hash = inet6_addr_hash(addr);
659
660 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
661 spin_unlock(&addrconf_hash_lock);
662
663 write_lock(&idev->lock);
664 /* Add to inet6_dev unicast addr list. */
665 ipv6_link_dev_addr(idev, ifa);
666
667 #ifdef CONFIG_IPV6_PRIVACY
668 if (ifa->flags&IFA_F_TEMPORARY) {
669 list_add(&ifa->tmp_list, &idev->tempaddr_list);
670 in6_ifa_hold(ifa);
671 }
672 #endif
673
674 in6_ifa_hold(ifa);
675 write_unlock(&idev->lock);
676 out2:
677 rcu_read_unlock_bh();
678
679 if (likely(err == 0))
680 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
681 else {
682 kfree(ifa);
683 ifa = ERR_PTR(err);
684 }
685
686 return ifa;
687 out:
688 spin_unlock(&addrconf_hash_lock);
689 goto out2;
690 }
691
692 /* This function wants to get referenced ifp and releases it before return */
693
694 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
695 {
696 struct inet6_ifaddr *ifa, *ifn;
697 struct inet6_dev *idev = ifp->idev;
698 int state;
699 int deleted = 0, onlink = 0;
700 unsigned long expires = jiffies;
701
702 spin_lock_bh(&ifp->state_lock);
703 state = ifp->state;
704 ifp->state = INET6_IFADDR_STATE_DEAD;
705 spin_unlock_bh(&ifp->state_lock);
706
707 if (state == INET6_IFADDR_STATE_DEAD)
708 goto out;
709
710 spin_lock_bh(&addrconf_hash_lock);
711 hlist_del_init_rcu(&ifp->addr_lst);
712 spin_unlock_bh(&addrconf_hash_lock);
713
714 write_lock_bh(&idev->lock);
715 #ifdef CONFIG_IPV6_PRIVACY
716 if (ifp->flags&IFA_F_TEMPORARY) {
717 list_del(&ifp->tmp_list);
718 if (ifp->ifpub) {
719 in6_ifa_put(ifp->ifpub);
720 ifp->ifpub = NULL;
721 }
722 __in6_ifa_put(ifp);
723 }
724 #endif
725
726 list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) {
727 if (ifa == ifp) {
728 list_del_init(&ifp->if_list);
729 __in6_ifa_put(ifp);
730
731 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
732 break;
733 deleted = 1;
734 continue;
735 } else if (ifp->flags & IFA_F_PERMANENT) {
736 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
737 ifp->prefix_len)) {
738 if (ifa->flags & IFA_F_PERMANENT) {
739 onlink = 1;
740 if (deleted)
741 break;
742 } else {
743 unsigned long lifetime;
744
745 if (!onlink)
746 onlink = -1;
747
748 spin_lock(&ifa->lock);
749
750 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
751 /*
752 * Note: Because this address is
753 * not permanent, lifetime <
754 * LONG_MAX / HZ here.
755 */
756 if (time_before(expires,
757 ifa->tstamp + lifetime * HZ))
758 expires = ifa->tstamp + lifetime * HZ;
759 spin_unlock(&ifa->lock);
760 }
761 }
762 }
763 }
764 write_unlock_bh(&idev->lock);
765
766 addrconf_del_timer(ifp);
767
768 ipv6_ifa_notify(RTM_DELADDR, ifp);
769
770 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
771
772 /*
773 * Purge or update corresponding prefix
774 *
775 * 1) we don't purge prefix here if address was not permanent.
776 * prefix is managed by its own lifetime.
777 * 2) if there're no addresses, delete prefix.
778 * 3) if there're still other permanent address(es),
779 * corresponding prefix is still permanent.
780 * 4) otherwise, update prefix lifetime to the
781 * longest valid lifetime among the corresponding
782 * addresses on the device.
783 * Note: subsequent RA will update lifetime.
784 *
785 * --yoshfuji
786 */
787 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
788 struct in6_addr prefix;
789 struct rt6_info *rt;
790 struct net *net = dev_net(ifp->idev->dev);
791 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
792 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1);
793
794 if (rt && addrconf_is_prefix_route(rt)) {
795 if (onlink == 0) {
796 ip6_del_rt(rt);
797 rt = NULL;
798 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
799 rt6_set_expires(rt, expires);
800 }
801 }
802 dst_release(&rt->dst);
803 }
804
805 /* clean up prefsrc entries */
806 rt6_remove_prefsrc(ifp);
807 out:
808 in6_ifa_put(ifp);
809 }
810
811 #ifdef CONFIG_IPV6_PRIVACY
812 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
813 {
814 struct inet6_dev *idev = ifp->idev;
815 struct in6_addr addr, *tmpaddr;
816 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
817 unsigned long regen_advance;
818 int tmp_plen;
819 int ret = 0;
820 int max_addresses;
821 u32 addr_flags;
822 unsigned long now = jiffies;
823
824 write_lock(&idev->lock);
825 if (ift) {
826 spin_lock_bh(&ift->lock);
827 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
828 spin_unlock_bh(&ift->lock);
829 tmpaddr = &addr;
830 } else {
831 tmpaddr = NULL;
832 }
833 retry:
834 in6_dev_hold(idev);
835 if (idev->cnf.use_tempaddr <= 0) {
836 write_unlock(&idev->lock);
837 pr_info("%s: use_tempaddr is disabled\n", __func__);
838 in6_dev_put(idev);
839 ret = -1;
840 goto out;
841 }
842 spin_lock_bh(&ifp->lock);
843 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
844 idev->cnf.use_tempaddr = -1; /*XXX*/
845 spin_unlock_bh(&ifp->lock);
846 write_unlock(&idev->lock);
847 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
848 __func__);
849 in6_dev_put(idev);
850 ret = -1;
851 goto out;
852 }
853 in6_ifa_hold(ifp);
854 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
855 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
856 spin_unlock_bh(&ifp->lock);
857 write_unlock(&idev->lock);
858 pr_warn("%s: regeneration of randomized interface id failed\n",
859 __func__);
860 in6_ifa_put(ifp);
861 in6_dev_put(idev);
862 ret = -1;
863 goto out;
864 }
865 memcpy(&addr.s6_addr[8], idev->rndid, 8);
866 age = (now - ifp->tstamp) / HZ;
867 tmp_valid_lft = min_t(__u32,
868 ifp->valid_lft,
869 idev->cnf.temp_valid_lft + age);
870 tmp_prefered_lft = min_t(__u32,
871 ifp->prefered_lft,
872 idev->cnf.temp_prefered_lft + age -
873 idev->cnf.max_desync_factor);
874 tmp_plen = ifp->prefix_len;
875 max_addresses = idev->cnf.max_addresses;
876 tmp_tstamp = ifp->tstamp;
877 spin_unlock_bh(&ifp->lock);
878
879 regen_advance = idev->cnf.regen_max_retry *
880 idev->cnf.dad_transmits *
881 idev->nd_parms->retrans_time / HZ;
882 write_unlock(&idev->lock);
883
884 /* A temporary address is created only if this calculated Preferred
885 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
886 * an implementation must not create a temporary address with a zero
887 * Preferred Lifetime.
888 */
889 if (tmp_prefered_lft <= regen_advance) {
890 in6_ifa_put(ifp);
891 in6_dev_put(idev);
892 ret = -1;
893 goto out;
894 }
895
896 addr_flags = IFA_F_TEMPORARY;
897 /* set in addrconf_prefix_rcv() */
898 if (ifp->flags & IFA_F_OPTIMISTIC)
899 addr_flags |= IFA_F_OPTIMISTIC;
900
901 ift = !max_addresses ||
902 ipv6_count_addresses(idev) < max_addresses ?
903 ipv6_add_addr(idev, &addr, tmp_plen,
904 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
905 addr_flags) : NULL;
906 if (!ift || IS_ERR(ift)) {
907 in6_ifa_put(ifp);
908 in6_dev_put(idev);
909 pr_info("%s: retry temporary address regeneration\n", __func__);
910 tmpaddr = &addr;
911 write_lock(&idev->lock);
912 goto retry;
913 }
914
915 spin_lock_bh(&ift->lock);
916 ift->ifpub = ifp;
917 ift->valid_lft = tmp_valid_lft;
918 ift->prefered_lft = tmp_prefered_lft;
919 ift->cstamp = now;
920 ift->tstamp = tmp_tstamp;
921 spin_unlock_bh(&ift->lock);
922
923 addrconf_dad_start(ift);
924 in6_ifa_put(ift);
925 in6_dev_put(idev);
926 out:
927 return ret;
928 }
929 #endif
930
931 /*
932 * Choose an appropriate source address (RFC3484)
933 */
934 enum {
935 IPV6_SADDR_RULE_INIT = 0,
936 IPV6_SADDR_RULE_LOCAL,
937 IPV6_SADDR_RULE_SCOPE,
938 IPV6_SADDR_RULE_PREFERRED,
939 #ifdef CONFIG_IPV6_MIP6
940 IPV6_SADDR_RULE_HOA,
941 #endif
942 IPV6_SADDR_RULE_OIF,
943 IPV6_SADDR_RULE_LABEL,
944 #ifdef CONFIG_IPV6_PRIVACY
945 IPV6_SADDR_RULE_PRIVACY,
946 #endif
947 IPV6_SADDR_RULE_ORCHID,
948 IPV6_SADDR_RULE_PREFIX,
949 IPV6_SADDR_RULE_MAX
950 };
951
952 struct ipv6_saddr_score {
953 int rule;
954 int addr_type;
955 struct inet6_ifaddr *ifa;
956 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
957 int scopedist;
958 int matchlen;
959 };
960
961 struct ipv6_saddr_dst {
962 const struct in6_addr *addr;
963 int ifindex;
964 int scope;
965 int label;
966 unsigned int prefs;
967 };
968
969 static inline int ipv6_saddr_preferred(int type)
970 {
971 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
972 return 1;
973 return 0;
974 }
975
976 static int ipv6_get_saddr_eval(struct net *net,
977 struct ipv6_saddr_score *score,
978 struct ipv6_saddr_dst *dst,
979 int i)
980 {
981 int ret;
982
983 if (i <= score->rule) {
984 switch (i) {
985 case IPV6_SADDR_RULE_SCOPE:
986 ret = score->scopedist;
987 break;
988 case IPV6_SADDR_RULE_PREFIX:
989 ret = score->matchlen;
990 break;
991 default:
992 ret = !!test_bit(i, score->scorebits);
993 }
994 goto out;
995 }
996
997 switch (i) {
998 case IPV6_SADDR_RULE_INIT:
999 /* Rule 0: remember if hiscore is not ready yet */
1000 ret = !!score->ifa;
1001 break;
1002 case IPV6_SADDR_RULE_LOCAL:
1003 /* Rule 1: Prefer same address */
1004 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1005 break;
1006 case IPV6_SADDR_RULE_SCOPE:
1007 /* Rule 2: Prefer appropriate scope
1008 *
1009 * ret
1010 * ^
1011 * -1 | d 15
1012 * ---+--+-+---> scope
1013 * |
1014 * | d is scope of the destination.
1015 * B-d | \
1016 * | \ <- smaller scope is better if
1017 * B-15 | \ if scope is enough for destinaion.
1018 * | ret = B - scope (-1 <= scope >= d <= 15).
1019 * d-C-1 | /
1020 * |/ <- greater is better
1021 * -C / if scope is not enough for destination.
1022 * /| ret = scope - C (-1 <= d < scope <= 15).
1023 *
1024 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1025 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1026 * Assume B = 0 and we get C > 29.
1027 */
1028 ret = __ipv6_addr_src_scope(score->addr_type);
1029 if (ret >= dst->scope)
1030 ret = -ret;
1031 else
1032 ret -= 128; /* 30 is enough */
1033 score->scopedist = ret;
1034 break;
1035 case IPV6_SADDR_RULE_PREFERRED:
1036 /* Rule 3: Avoid deprecated and optimistic addresses */
1037 ret = ipv6_saddr_preferred(score->addr_type) ||
1038 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1039 break;
1040 #ifdef CONFIG_IPV6_MIP6
1041 case IPV6_SADDR_RULE_HOA:
1042 {
1043 /* Rule 4: Prefer home address */
1044 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1045 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1046 break;
1047 }
1048 #endif
1049 case IPV6_SADDR_RULE_OIF:
1050 /* Rule 5: Prefer outgoing interface */
1051 ret = (!dst->ifindex ||
1052 dst->ifindex == score->ifa->idev->dev->ifindex);
1053 break;
1054 case IPV6_SADDR_RULE_LABEL:
1055 /* Rule 6: Prefer matching label */
1056 ret = ipv6_addr_label(net,
1057 &score->ifa->addr, score->addr_type,
1058 score->ifa->idev->dev->ifindex) == dst->label;
1059 break;
1060 #ifdef CONFIG_IPV6_PRIVACY
1061 case IPV6_SADDR_RULE_PRIVACY:
1062 {
1063 /* Rule 7: Prefer public address
1064 * Note: prefer temporary address if use_tempaddr >= 2
1065 */
1066 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1067 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1068 score->ifa->idev->cnf.use_tempaddr >= 2;
1069 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1070 break;
1071 }
1072 #endif
1073 case IPV6_SADDR_RULE_ORCHID:
1074 /* Rule 8-: Prefer ORCHID vs ORCHID or
1075 * non-ORCHID vs non-ORCHID
1076 */
1077 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1078 ipv6_addr_orchid(dst->addr));
1079 break;
1080 case IPV6_SADDR_RULE_PREFIX:
1081 /* Rule 8: Use longest matching prefix */
1082 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr,
1083 dst->addr);
1084 break;
1085 default:
1086 ret = 0;
1087 }
1088
1089 if (ret)
1090 __set_bit(i, score->scorebits);
1091 score->rule = i;
1092 out:
1093 return ret;
1094 }
1095
1096 int ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev,
1097 const struct in6_addr *daddr, unsigned int prefs,
1098 struct in6_addr *saddr)
1099 {
1100 struct ipv6_saddr_score scores[2],
1101 *score = &scores[0], *hiscore = &scores[1];
1102 struct ipv6_saddr_dst dst;
1103 struct net_device *dev;
1104 int dst_type;
1105
1106 dst_type = __ipv6_addr_type(daddr);
1107 dst.addr = daddr;
1108 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1109 dst.scope = __ipv6_addr_src_scope(dst_type);
1110 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1111 dst.prefs = prefs;
1112
1113 hiscore->rule = -1;
1114 hiscore->ifa = NULL;
1115
1116 rcu_read_lock();
1117
1118 for_each_netdev_rcu(net, dev) {
1119 struct inet6_dev *idev;
1120
1121 /* Candidate Source Address (section 4)
1122 * - multicast and link-local destination address,
1123 * the set of candidate source address MUST only
1124 * include addresses assigned to interfaces
1125 * belonging to the same link as the outgoing
1126 * interface.
1127 * (- For site-local destination addresses, the
1128 * set of candidate source addresses MUST only
1129 * include addresses assigned to interfaces
1130 * belonging to the same site as the outgoing
1131 * interface.)
1132 */
1133 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1134 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1135 dst.ifindex && dev->ifindex != dst.ifindex)
1136 continue;
1137
1138 idev = __in6_dev_get(dev);
1139 if (!idev)
1140 continue;
1141
1142 read_lock_bh(&idev->lock);
1143 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1144 int i;
1145
1146 /*
1147 * - Tentative Address (RFC2462 section 5.4)
1148 * - A tentative address is not considered
1149 * "assigned to an interface" in the traditional
1150 * sense, unless it is also flagged as optimistic.
1151 * - Candidate Source Address (section 4)
1152 * - In any case, anycast addresses, multicast
1153 * addresses, and the unspecified address MUST
1154 * NOT be included in a candidate set.
1155 */
1156 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1157 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1158 continue;
1159
1160 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1161
1162 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1163 score->addr_type & IPV6_ADDR_MULTICAST)) {
1164 LIMIT_NETDEBUG(KERN_DEBUG
1165 "ADDRCONF: unspecified / multicast address "
1166 "assigned as unicast address on %s",
1167 dev->name);
1168 continue;
1169 }
1170
1171 score->rule = -1;
1172 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1173
1174 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1175 int minihiscore, miniscore;
1176
1177 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1178 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1179
1180 if (minihiscore > miniscore) {
1181 if (i == IPV6_SADDR_RULE_SCOPE &&
1182 score->scopedist > 0) {
1183 /*
1184 * special case:
1185 * each remaining entry
1186 * has too small (not enough)
1187 * scope, because ifa entries
1188 * are sorted by their scope
1189 * values.
1190 */
1191 goto try_nextdev;
1192 }
1193 break;
1194 } else if (minihiscore < miniscore) {
1195 if (hiscore->ifa)
1196 in6_ifa_put(hiscore->ifa);
1197
1198 in6_ifa_hold(score->ifa);
1199
1200 swap(hiscore, score);
1201
1202 /* restore our iterator */
1203 score->ifa = hiscore->ifa;
1204
1205 break;
1206 }
1207 }
1208 }
1209 try_nextdev:
1210 read_unlock_bh(&idev->lock);
1211 }
1212 rcu_read_unlock();
1213
1214 if (!hiscore->ifa)
1215 return -EADDRNOTAVAIL;
1216
1217 *saddr = hiscore->ifa->addr;
1218 in6_ifa_put(hiscore->ifa);
1219 return 0;
1220 }
1221 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1222
1223 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1224 unsigned char banned_flags)
1225 {
1226 struct inet6_dev *idev;
1227 int err = -EADDRNOTAVAIL;
1228
1229 rcu_read_lock();
1230 idev = __in6_dev_get(dev);
1231 if (idev) {
1232 struct inet6_ifaddr *ifp;
1233
1234 read_lock_bh(&idev->lock);
1235 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1236 if (ifp->scope == IFA_LINK &&
1237 !(ifp->flags & banned_flags)) {
1238 *addr = ifp->addr;
1239 err = 0;
1240 break;
1241 }
1242 }
1243 read_unlock_bh(&idev->lock);
1244 }
1245 rcu_read_unlock();
1246 return err;
1247 }
1248
1249 static int ipv6_count_addresses(struct inet6_dev *idev)
1250 {
1251 int cnt = 0;
1252 struct inet6_ifaddr *ifp;
1253
1254 read_lock_bh(&idev->lock);
1255 list_for_each_entry(ifp, &idev->addr_list, if_list)
1256 cnt++;
1257 read_unlock_bh(&idev->lock);
1258 return cnt;
1259 }
1260
1261 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1262 struct net_device *dev, int strict)
1263 {
1264 struct inet6_ifaddr *ifp;
1265 struct hlist_node *node;
1266 unsigned int hash = inet6_addr_hash(addr);
1267
1268 rcu_read_lock_bh();
1269 hlist_for_each_entry_rcu(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1270 if (!net_eq(dev_net(ifp->idev->dev), net))
1271 continue;
1272 if (ipv6_addr_equal(&ifp->addr, addr) &&
1273 !(ifp->flags&IFA_F_TENTATIVE) &&
1274 (dev == NULL || ifp->idev->dev == dev ||
1275 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1276 rcu_read_unlock_bh();
1277 return 1;
1278 }
1279 }
1280
1281 rcu_read_unlock_bh();
1282 return 0;
1283 }
1284 EXPORT_SYMBOL(ipv6_chk_addr);
1285
1286 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1287 struct net_device *dev)
1288 {
1289 unsigned int hash = inet6_addr_hash(addr);
1290 struct inet6_ifaddr *ifp;
1291 struct hlist_node *node;
1292
1293 hlist_for_each_entry(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1294 if (!net_eq(dev_net(ifp->idev->dev), net))
1295 continue;
1296 if (ipv6_addr_equal(&ifp->addr, addr)) {
1297 if (dev == NULL || ifp->idev->dev == dev)
1298 return true;
1299 }
1300 }
1301 return false;
1302 }
1303
1304 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1305 {
1306 struct inet6_dev *idev;
1307 struct inet6_ifaddr *ifa;
1308 int onlink;
1309
1310 onlink = 0;
1311 rcu_read_lock();
1312 idev = __in6_dev_get(dev);
1313 if (idev) {
1314 read_lock_bh(&idev->lock);
1315 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1316 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1317 ifa->prefix_len);
1318 if (onlink)
1319 break;
1320 }
1321 read_unlock_bh(&idev->lock);
1322 }
1323 rcu_read_unlock();
1324 return onlink;
1325 }
1326 EXPORT_SYMBOL(ipv6_chk_prefix);
1327
1328 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1329 struct net_device *dev, int strict)
1330 {
1331 struct inet6_ifaddr *ifp, *result = NULL;
1332 unsigned int hash = inet6_addr_hash(addr);
1333 struct hlist_node *node;
1334
1335 rcu_read_lock_bh();
1336 hlist_for_each_entry_rcu_bh(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1337 if (!net_eq(dev_net(ifp->idev->dev), net))
1338 continue;
1339 if (ipv6_addr_equal(&ifp->addr, addr)) {
1340 if (dev == NULL || ifp->idev->dev == dev ||
1341 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1342 result = ifp;
1343 in6_ifa_hold(ifp);
1344 break;
1345 }
1346 }
1347 }
1348 rcu_read_unlock_bh();
1349
1350 return result;
1351 }
1352
1353 /* Gets referenced address, destroys ifaddr */
1354
1355 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1356 {
1357 if (ifp->flags&IFA_F_PERMANENT) {
1358 spin_lock_bh(&ifp->lock);
1359 addrconf_del_timer(ifp);
1360 ifp->flags |= IFA_F_TENTATIVE;
1361 if (dad_failed)
1362 ifp->flags |= IFA_F_DADFAILED;
1363 spin_unlock_bh(&ifp->lock);
1364 if (dad_failed)
1365 ipv6_ifa_notify(0, ifp);
1366 in6_ifa_put(ifp);
1367 #ifdef CONFIG_IPV6_PRIVACY
1368 } else if (ifp->flags&IFA_F_TEMPORARY) {
1369 struct inet6_ifaddr *ifpub;
1370 spin_lock_bh(&ifp->lock);
1371 ifpub = ifp->ifpub;
1372 if (ifpub) {
1373 in6_ifa_hold(ifpub);
1374 spin_unlock_bh(&ifp->lock);
1375 ipv6_create_tempaddr(ifpub, ifp);
1376 in6_ifa_put(ifpub);
1377 } else {
1378 spin_unlock_bh(&ifp->lock);
1379 }
1380 ipv6_del_addr(ifp);
1381 #endif
1382 } else
1383 ipv6_del_addr(ifp);
1384 }
1385
1386 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1387 {
1388 int err = -ENOENT;
1389
1390 spin_lock(&ifp->state_lock);
1391 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1392 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1393 err = 0;
1394 }
1395 spin_unlock(&ifp->state_lock);
1396
1397 return err;
1398 }
1399
1400 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1401 {
1402 struct inet6_dev *idev = ifp->idev;
1403
1404 if (addrconf_dad_end(ifp)) {
1405 in6_ifa_put(ifp);
1406 return;
1407 }
1408
1409 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1410 ifp->idev->dev->name, &ifp->addr);
1411
1412 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1413 struct in6_addr addr;
1414
1415 addr.s6_addr32[0] = htonl(0xfe800000);
1416 addr.s6_addr32[1] = 0;
1417
1418 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1419 ipv6_addr_equal(&ifp->addr, &addr)) {
1420 /* DAD failed for link-local based on MAC address */
1421 idev->cnf.disable_ipv6 = 1;
1422
1423 pr_info("%s: IPv6 being disabled!\n",
1424 ifp->idev->dev->name);
1425 }
1426 }
1427
1428 addrconf_dad_stop(ifp, 1);
1429 }
1430
1431 /* Join to solicited addr multicast group. */
1432
1433 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1434 {
1435 struct in6_addr maddr;
1436
1437 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1438 return;
1439
1440 addrconf_addr_solict_mult(addr, &maddr);
1441 ipv6_dev_mc_inc(dev, &maddr);
1442 }
1443
1444 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1445 {
1446 struct in6_addr maddr;
1447
1448 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1449 return;
1450
1451 addrconf_addr_solict_mult(addr, &maddr);
1452 __ipv6_dev_mc_dec(idev, &maddr);
1453 }
1454
1455 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1456 {
1457 struct in6_addr addr;
1458 if (ifp->prefix_len == 127) /* RFC 6164 */
1459 return;
1460 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1461 if (ipv6_addr_any(&addr))
1462 return;
1463 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1464 }
1465
1466 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1467 {
1468 struct in6_addr addr;
1469 if (ifp->prefix_len == 127) /* RFC 6164 */
1470 return;
1471 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1472 if (ipv6_addr_any(&addr))
1473 return;
1474 __ipv6_dev_ac_dec(ifp->idev, &addr);
1475 }
1476
1477 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1478 {
1479 if (dev->addr_len != ETH_ALEN)
1480 return -1;
1481 memcpy(eui, dev->dev_addr, 3);
1482 memcpy(eui + 5, dev->dev_addr + 3, 3);
1483
1484 /*
1485 * The zSeries OSA network cards can be shared among various
1486 * OS instances, but the OSA cards have only one MAC address.
1487 * This leads to duplicate address conflicts in conjunction
1488 * with IPv6 if more than one instance uses the same card.
1489 *
1490 * The driver for these cards can deliver a unique 16-bit
1491 * identifier for each instance sharing the same card. It is
1492 * placed instead of 0xFFFE in the interface identifier. The
1493 * "u" bit of the interface identifier is not inverted in this
1494 * case. Hence the resulting interface identifier has local
1495 * scope according to RFC2373.
1496 */
1497 if (dev->dev_id) {
1498 eui[3] = (dev->dev_id >> 8) & 0xFF;
1499 eui[4] = dev->dev_id & 0xFF;
1500 } else {
1501 eui[3] = 0xFF;
1502 eui[4] = 0xFE;
1503 eui[0] ^= 2;
1504 }
1505 return 0;
1506 }
1507
1508 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1509 {
1510 if (dev->addr_len != IEEE802154_ADDR_LEN)
1511 return -1;
1512 memcpy(eui, dev->dev_addr, 8);
1513 return 0;
1514 }
1515
1516 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1517 {
1518 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1519 if (dev->addr_len != ARCNET_ALEN)
1520 return -1;
1521 memset(eui, 0, 7);
1522 eui[7] = *(u8 *)dev->dev_addr;
1523 return 0;
1524 }
1525
1526 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1527 {
1528 if (dev->addr_len != INFINIBAND_ALEN)
1529 return -1;
1530 memcpy(eui, dev->dev_addr + 12, 8);
1531 eui[0] |= 2;
1532 return 0;
1533 }
1534
1535 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1536 {
1537 if (addr == 0)
1538 return -1;
1539 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1540 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1541 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1542 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1543 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1544 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1545 eui[1] = 0;
1546 eui[2] = 0x5E;
1547 eui[3] = 0xFE;
1548 memcpy(eui + 4, &addr, 4);
1549 return 0;
1550 }
1551
1552 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1553 {
1554 if (dev->priv_flags & IFF_ISATAP)
1555 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1556 return -1;
1557 }
1558
1559 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
1560 {
1561 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1562 }
1563
1564 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1565 {
1566 switch (dev->type) {
1567 case ARPHRD_ETHER:
1568 case ARPHRD_FDDI:
1569 return addrconf_ifid_eui48(eui, dev);
1570 case ARPHRD_ARCNET:
1571 return addrconf_ifid_arcnet(eui, dev);
1572 case ARPHRD_INFINIBAND:
1573 return addrconf_ifid_infiniband(eui, dev);
1574 case ARPHRD_SIT:
1575 return addrconf_ifid_sit(eui, dev);
1576 case ARPHRD_IPGRE:
1577 return addrconf_ifid_gre(eui, dev);
1578 case ARPHRD_IEEE802154:
1579 return addrconf_ifid_eui64(eui, dev);
1580 }
1581 return -1;
1582 }
1583
1584 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1585 {
1586 int err = -1;
1587 struct inet6_ifaddr *ifp;
1588
1589 read_lock_bh(&idev->lock);
1590 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1591 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1592 memcpy(eui, ifp->addr.s6_addr+8, 8);
1593 err = 0;
1594 break;
1595 }
1596 }
1597 read_unlock_bh(&idev->lock);
1598 return err;
1599 }
1600
1601 #ifdef CONFIG_IPV6_PRIVACY
1602 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1603 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1604 {
1605 regen:
1606 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1607 idev->rndid[0] &= ~0x02;
1608
1609 /*
1610 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1611 * check if generated address is not inappropriate
1612 *
1613 * - Reserved subnet anycast (RFC 2526)
1614 * 11111101 11....11 1xxxxxxx
1615 * - ISATAP (RFC4214) 6.1
1616 * 00-00-5E-FE-xx-xx-xx-xx
1617 * - value 0
1618 * - XXX: already assigned to an address on the device
1619 */
1620 if (idev->rndid[0] == 0xfd &&
1621 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1622 (idev->rndid[7]&0x80))
1623 goto regen;
1624 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1625 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1626 goto regen;
1627 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1628 goto regen;
1629 }
1630
1631 return 0;
1632 }
1633
1634 static void ipv6_regen_rndid(unsigned long data)
1635 {
1636 struct inet6_dev *idev = (struct inet6_dev *) data;
1637 unsigned long expires;
1638
1639 rcu_read_lock_bh();
1640 write_lock_bh(&idev->lock);
1641
1642 if (idev->dead)
1643 goto out;
1644
1645 if (__ipv6_regen_rndid(idev) < 0)
1646 goto out;
1647
1648 expires = jiffies +
1649 idev->cnf.temp_prefered_lft * HZ -
1650 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time -
1651 idev->cnf.max_desync_factor * HZ;
1652 if (time_before(expires, jiffies)) {
1653 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
1654 __func__, idev->dev->name);
1655 goto out;
1656 }
1657
1658 if (!mod_timer(&idev->regen_timer, expires))
1659 in6_dev_hold(idev);
1660
1661 out:
1662 write_unlock_bh(&idev->lock);
1663 rcu_read_unlock_bh();
1664 in6_dev_put(idev);
1665 }
1666
1667 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
1668 {
1669 int ret = 0;
1670
1671 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1672 ret = __ipv6_regen_rndid(idev);
1673 return ret;
1674 }
1675 #endif
1676
1677 /*
1678 * Add prefix route.
1679 */
1680
1681 static void
1682 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1683 unsigned long expires, u32 flags)
1684 {
1685 struct fib6_config cfg = {
1686 .fc_table = RT6_TABLE_PREFIX,
1687 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1688 .fc_ifindex = dev->ifindex,
1689 .fc_expires = expires,
1690 .fc_dst_len = plen,
1691 .fc_flags = RTF_UP | flags,
1692 .fc_nlinfo.nl_net = dev_net(dev),
1693 .fc_protocol = RTPROT_KERNEL,
1694 };
1695
1696 cfg.fc_dst = *pfx;
1697
1698 /* Prevent useless cloning on PtP SIT.
1699 This thing is done here expecting that the whole
1700 class of non-broadcast devices need not cloning.
1701 */
1702 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1703 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1704 cfg.fc_flags |= RTF_NONEXTHOP;
1705 #endif
1706
1707 ip6_route_add(&cfg);
1708 }
1709
1710
1711 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
1712 int plen,
1713 const struct net_device *dev,
1714 u32 flags, u32 noflags)
1715 {
1716 struct fib6_node *fn;
1717 struct rt6_info *rt = NULL;
1718 struct fib6_table *table;
1719
1720 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX);
1721 if (table == NULL)
1722 return NULL;
1723
1724 write_lock_bh(&table->tb6_lock);
1725 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
1726 if (!fn)
1727 goto out;
1728 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1729 if (rt->dst.dev->ifindex != dev->ifindex)
1730 continue;
1731 if ((rt->rt6i_flags & flags) != flags)
1732 continue;
1733 if ((noflags != 0) && ((rt->rt6i_flags & flags) != 0))
1734 continue;
1735 dst_hold(&rt->dst);
1736 break;
1737 }
1738 out:
1739 write_unlock_bh(&table->tb6_lock);
1740 return rt;
1741 }
1742
1743
1744 /* Create "default" multicast route to the interface */
1745
1746 static void addrconf_add_mroute(struct net_device *dev)
1747 {
1748 struct fib6_config cfg = {
1749 .fc_table = RT6_TABLE_LOCAL,
1750 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1751 .fc_ifindex = dev->ifindex,
1752 .fc_dst_len = 8,
1753 .fc_flags = RTF_UP,
1754 .fc_nlinfo.nl_net = dev_net(dev),
1755 };
1756
1757 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1758
1759 ip6_route_add(&cfg);
1760 }
1761
1762 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1763 static void sit_route_add(struct net_device *dev)
1764 {
1765 struct fib6_config cfg = {
1766 .fc_table = RT6_TABLE_MAIN,
1767 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1768 .fc_ifindex = dev->ifindex,
1769 .fc_dst_len = 96,
1770 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1771 .fc_nlinfo.nl_net = dev_net(dev),
1772 };
1773
1774 /* prefix length - 96 bits "::d.d.d.d" */
1775 ip6_route_add(&cfg);
1776 }
1777 #endif
1778
1779 static void addrconf_add_lroute(struct net_device *dev)
1780 {
1781 struct in6_addr addr;
1782
1783 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1784 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1785 }
1786
1787 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1788 {
1789 struct inet6_dev *idev;
1790
1791 ASSERT_RTNL();
1792
1793 idev = ipv6_find_idev(dev);
1794 if (!idev)
1795 return ERR_PTR(-ENOBUFS);
1796
1797 if (idev->cnf.disable_ipv6)
1798 return ERR_PTR(-EACCES);
1799
1800 /* Add default multicast route */
1801 if (!(dev->flags & IFF_LOOPBACK))
1802 addrconf_add_mroute(dev);
1803
1804 /* Add link local route */
1805 addrconf_add_lroute(dev);
1806 return idev;
1807 }
1808
1809 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
1810 {
1811 struct prefix_info *pinfo;
1812 __u32 valid_lft;
1813 __u32 prefered_lft;
1814 int addr_type;
1815 struct inet6_dev *in6_dev;
1816 struct net *net = dev_net(dev);
1817
1818 pinfo = (struct prefix_info *) opt;
1819
1820 if (len < sizeof(struct prefix_info)) {
1821 ADBG(("addrconf: prefix option too short\n"));
1822 return;
1823 }
1824
1825 /*
1826 * Validation checks ([ADDRCONF], page 19)
1827 */
1828
1829 addr_type = ipv6_addr_type(&pinfo->prefix);
1830
1831 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1832 return;
1833
1834 valid_lft = ntohl(pinfo->valid);
1835 prefered_lft = ntohl(pinfo->prefered);
1836
1837 if (prefered_lft > valid_lft) {
1838 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
1839 return;
1840 }
1841
1842 in6_dev = in6_dev_get(dev);
1843
1844 if (in6_dev == NULL) {
1845 net_dbg_ratelimited("addrconf: device %s not configured\n",
1846 dev->name);
1847 return;
1848 }
1849
1850 /*
1851 * Two things going on here:
1852 * 1) Add routes for on-link prefixes
1853 * 2) Configure prefixes with the auto flag set
1854 */
1855
1856 if (pinfo->onlink) {
1857 struct rt6_info *rt;
1858 unsigned long rt_expires;
1859
1860 /* Avoid arithmetic overflow. Really, we could
1861 * save rt_expires in seconds, likely valid_lft,
1862 * but it would require division in fib gc, that it
1863 * not good.
1864 */
1865 if (HZ > USER_HZ)
1866 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
1867 else
1868 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
1869
1870 if (addrconf_finite_timeout(rt_expires))
1871 rt_expires *= HZ;
1872
1873 rt = addrconf_get_prefix_route(&pinfo->prefix,
1874 pinfo->prefix_len,
1875 dev,
1876 RTF_ADDRCONF | RTF_PREFIX_RT,
1877 RTF_GATEWAY | RTF_DEFAULT);
1878
1879 if (rt) {
1880 /* Autoconf prefix route */
1881 if (valid_lft == 0) {
1882 ip6_del_rt(rt);
1883 rt = NULL;
1884 } else if (addrconf_finite_timeout(rt_expires)) {
1885 /* not infinity */
1886 rt6_set_expires(rt, jiffies + rt_expires);
1887 } else {
1888 rt6_clean_expires(rt);
1889 }
1890 } else if (valid_lft) {
1891 clock_t expires = 0;
1892 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
1893 if (addrconf_finite_timeout(rt_expires)) {
1894 /* not infinity */
1895 flags |= RTF_EXPIRES;
1896 expires = jiffies_to_clock_t(rt_expires);
1897 }
1898 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1899 dev, expires, flags);
1900 }
1901 if (rt)
1902 dst_release(&rt->dst);
1903 }
1904
1905 /* Try to figure out our local address for this prefix */
1906
1907 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1908 struct inet6_ifaddr *ifp;
1909 struct in6_addr addr;
1910 int create = 0, update_lft = 0;
1911
1912 if (pinfo->prefix_len == 64) {
1913 memcpy(&addr, &pinfo->prefix, 8);
1914 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1915 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1916 in6_dev_put(in6_dev);
1917 return;
1918 }
1919 goto ok;
1920 }
1921 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
1922 pinfo->prefix_len);
1923 in6_dev_put(in6_dev);
1924 return;
1925
1926 ok:
1927
1928 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1929
1930 if (ifp == NULL && valid_lft) {
1931 int max_addresses = in6_dev->cnf.max_addresses;
1932 u32 addr_flags = 0;
1933
1934 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1935 if (in6_dev->cnf.optimistic_dad &&
1936 !net->ipv6.devconf_all->forwarding && sllao)
1937 addr_flags = IFA_F_OPTIMISTIC;
1938 #endif
1939
1940 /* Do not allow to create too much of autoconfigured
1941 * addresses; this would be too easy way to crash kernel.
1942 */
1943 if (!max_addresses ||
1944 ipv6_count_addresses(in6_dev) < max_addresses)
1945 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1946 addr_type&IPV6_ADDR_SCOPE_MASK,
1947 addr_flags);
1948
1949 if (!ifp || IS_ERR(ifp)) {
1950 in6_dev_put(in6_dev);
1951 return;
1952 }
1953
1954 update_lft = create = 1;
1955 ifp->cstamp = jiffies;
1956 addrconf_dad_start(ifp);
1957 }
1958
1959 if (ifp) {
1960 int flags;
1961 unsigned long now;
1962 #ifdef CONFIG_IPV6_PRIVACY
1963 struct inet6_ifaddr *ift;
1964 #endif
1965 u32 stored_lft;
1966
1967 /* update lifetime (RFC2462 5.5.3 e) */
1968 spin_lock(&ifp->lock);
1969 now = jiffies;
1970 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1971 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1972 else
1973 stored_lft = 0;
1974 if (!update_lft && stored_lft) {
1975 if (valid_lft > MIN_VALID_LIFETIME ||
1976 valid_lft > stored_lft)
1977 update_lft = 1;
1978 else if (stored_lft <= MIN_VALID_LIFETIME) {
1979 /* valid_lft <= stored_lft is always true */
1980 /*
1981 * RFC 4862 Section 5.5.3e:
1982 * "Note that the preferred lifetime of
1983 * the corresponding address is always
1984 * reset to the Preferred Lifetime in
1985 * the received Prefix Information
1986 * option, regardless of whether the
1987 * valid lifetime is also reset or
1988 * ignored."
1989 *
1990 * So if the preferred lifetime in
1991 * this advertisement is different
1992 * than what we have stored, but the
1993 * valid lifetime is invalid, just
1994 * reset prefered_lft.
1995 *
1996 * We must set the valid lifetime
1997 * to the stored lifetime since we'll
1998 * be updating the timestamp below,
1999 * else we'll set it back to the
2000 * minimum.
2001 */
2002 if (prefered_lft != ifp->prefered_lft) {
2003 valid_lft = stored_lft;
2004 update_lft = 1;
2005 }
2006 } else {
2007 valid_lft = MIN_VALID_LIFETIME;
2008 if (valid_lft < prefered_lft)
2009 prefered_lft = valid_lft;
2010 update_lft = 1;
2011 }
2012 }
2013
2014 if (update_lft) {
2015 ifp->valid_lft = valid_lft;
2016 ifp->prefered_lft = prefered_lft;
2017 ifp->tstamp = now;
2018 flags = ifp->flags;
2019 ifp->flags &= ~IFA_F_DEPRECATED;
2020 spin_unlock(&ifp->lock);
2021
2022 if (!(flags&IFA_F_TENTATIVE))
2023 ipv6_ifa_notify(0, ifp);
2024 } else
2025 spin_unlock(&ifp->lock);
2026
2027 #ifdef CONFIG_IPV6_PRIVACY
2028 read_lock_bh(&in6_dev->lock);
2029 /* update all temporary addresses in the list */
2030 list_for_each_entry(ift, &in6_dev->tempaddr_list,
2031 tmp_list) {
2032 int age, max_valid, max_prefered;
2033
2034 if (ifp != ift->ifpub)
2035 continue;
2036
2037 /*
2038 * RFC 4941 section 3.3:
2039 * If a received option will extend the lifetime
2040 * of a public address, the lifetimes of
2041 * temporary addresses should be extended,
2042 * subject to the overall constraint that no
2043 * temporary addresses should ever remain
2044 * "valid" or "preferred" for a time longer than
2045 * (TEMP_VALID_LIFETIME) or
2046 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR),
2047 * respectively.
2048 */
2049 age = (now - ift->cstamp) / HZ;
2050 max_valid = in6_dev->cnf.temp_valid_lft - age;
2051 if (max_valid < 0)
2052 max_valid = 0;
2053
2054 max_prefered = in6_dev->cnf.temp_prefered_lft -
2055 in6_dev->cnf.max_desync_factor -
2056 age;
2057 if (max_prefered < 0)
2058 max_prefered = 0;
2059
2060 if (valid_lft > max_valid)
2061 valid_lft = max_valid;
2062
2063 if (prefered_lft > max_prefered)
2064 prefered_lft = max_prefered;
2065
2066 spin_lock(&ift->lock);
2067 flags = ift->flags;
2068 ift->valid_lft = valid_lft;
2069 ift->prefered_lft = prefered_lft;
2070 ift->tstamp = now;
2071 if (prefered_lft > 0)
2072 ift->flags &= ~IFA_F_DEPRECATED;
2073
2074 spin_unlock(&ift->lock);
2075 if (!(flags&IFA_F_TENTATIVE))
2076 ipv6_ifa_notify(0, ift);
2077 }
2078
2079 if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) {
2080 /*
2081 * When a new public address is created as
2082 * described in [ADDRCONF], also create a new
2083 * temporary address. Also create a temporary
2084 * address if it's enabled but no temporary
2085 * address currently exists.
2086 */
2087 read_unlock_bh(&in6_dev->lock);
2088 ipv6_create_tempaddr(ifp, NULL);
2089 } else {
2090 read_unlock_bh(&in6_dev->lock);
2091 }
2092 #endif
2093 in6_ifa_put(ifp);
2094 addrconf_verify(0);
2095 }
2096 }
2097 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2098 in6_dev_put(in6_dev);
2099 }
2100
2101 /*
2102 * Set destination address.
2103 * Special case for SIT interfaces where we create a new "virtual"
2104 * device.
2105 */
2106 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2107 {
2108 struct in6_ifreq ireq;
2109 struct net_device *dev;
2110 int err = -EINVAL;
2111
2112 rtnl_lock();
2113
2114 err = -EFAULT;
2115 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2116 goto err_exit;
2117
2118 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2119
2120 err = -ENODEV;
2121 if (dev == NULL)
2122 goto err_exit;
2123
2124 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2125 if (dev->type == ARPHRD_SIT) {
2126 const struct net_device_ops *ops = dev->netdev_ops;
2127 struct ifreq ifr;
2128 struct ip_tunnel_parm p;
2129
2130 err = -EADDRNOTAVAIL;
2131 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2132 goto err_exit;
2133
2134 memset(&p, 0, sizeof(p));
2135 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2136 p.iph.saddr = 0;
2137 p.iph.version = 4;
2138 p.iph.ihl = 5;
2139 p.iph.protocol = IPPROTO_IPV6;
2140 p.iph.ttl = 64;
2141 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2142
2143 if (ops->ndo_do_ioctl) {
2144 mm_segment_t oldfs = get_fs();
2145
2146 set_fs(KERNEL_DS);
2147 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2148 set_fs(oldfs);
2149 } else
2150 err = -EOPNOTSUPP;
2151
2152 if (err == 0) {
2153 err = -ENOBUFS;
2154 dev = __dev_get_by_name(net, p.name);
2155 if (!dev)
2156 goto err_exit;
2157 err = dev_open(dev);
2158 }
2159 }
2160 #endif
2161
2162 err_exit:
2163 rtnl_unlock();
2164 return err;
2165 }
2166
2167 /*
2168 * Manual configuration of address on an interface
2169 */
2170 static int inet6_addr_add(struct net *net, int ifindex, const struct in6_addr *pfx,
2171 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
2172 __u32 valid_lft)
2173 {
2174 struct inet6_ifaddr *ifp;
2175 struct inet6_dev *idev;
2176 struct net_device *dev;
2177 int scope;
2178 u32 flags;
2179 clock_t expires;
2180 unsigned long timeout;
2181
2182 ASSERT_RTNL();
2183
2184 if (plen > 128)
2185 return -EINVAL;
2186
2187 /* check the lifetime */
2188 if (!valid_lft || prefered_lft > valid_lft)
2189 return -EINVAL;
2190
2191 dev = __dev_get_by_index(net, ifindex);
2192 if (!dev)
2193 return -ENODEV;
2194
2195 idev = addrconf_add_dev(dev);
2196 if (IS_ERR(idev))
2197 return PTR_ERR(idev);
2198
2199 scope = ipv6_addr_scope(pfx);
2200
2201 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2202 if (addrconf_finite_timeout(timeout)) {
2203 expires = jiffies_to_clock_t(timeout * HZ);
2204 valid_lft = timeout;
2205 flags = RTF_EXPIRES;
2206 } else {
2207 expires = 0;
2208 flags = 0;
2209 ifa_flags |= IFA_F_PERMANENT;
2210 }
2211
2212 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2213 if (addrconf_finite_timeout(timeout)) {
2214 if (timeout == 0)
2215 ifa_flags |= IFA_F_DEPRECATED;
2216 prefered_lft = timeout;
2217 }
2218
2219 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2220
2221 if (!IS_ERR(ifp)) {
2222 spin_lock_bh(&ifp->lock);
2223 ifp->valid_lft = valid_lft;
2224 ifp->prefered_lft = prefered_lft;
2225 ifp->tstamp = jiffies;
2226 spin_unlock_bh(&ifp->lock);
2227
2228 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2229 expires, flags);
2230 /*
2231 * Note that section 3.1 of RFC 4429 indicates
2232 * that the Optimistic flag should not be set for
2233 * manually configured addresses
2234 */
2235 addrconf_dad_start(ifp);
2236 in6_ifa_put(ifp);
2237 addrconf_verify(0);
2238 return 0;
2239 }
2240
2241 return PTR_ERR(ifp);
2242 }
2243
2244 static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx,
2245 unsigned int plen)
2246 {
2247 struct inet6_ifaddr *ifp;
2248 struct inet6_dev *idev;
2249 struct net_device *dev;
2250
2251 if (plen > 128)
2252 return -EINVAL;
2253
2254 dev = __dev_get_by_index(net, ifindex);
2255 if (!dev)
2256 return -ENODEV;
2257
2258 if ((idev = __in6_dev_get(dev)) == NULL)
2259 return -ENXIO;
2260
2261 read_lock_bh(&idev->lock);
2262 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2263 if (ifp->prefix_len == plen &&
2264 ipv6_addr_equal(pfx, &ifp->addr)) {
2265 in6_ifa_hold(ifp);
2266 read_unlock_bh(&idev->lock);
2267
2268 ipv6_del_addr(ifp);
2269
2270 /* If the last address is deleted administratively,
2271 disable IPv6 on this interface.
2272 */
2273 if (list_empty(&idev->addr_list))
2274 addrconf_ifdown(idev->dev, 1);
2275 return 0;
2276 }
2277 }
2278 read_unlock_bh(&idev->lock);
2279 return -EADDRNOTAVAIL;
2280 }
2281
2282
2283 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2284 {
2285 struct in6_ifreq ireq;
2286 int err;
2287
2288 if (!capable(CAP_NET_ADMIN))
2289 return -EPERM;
2290
2291 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2292 return -EFAULT;
2293
2294 rtnl_lock();
2295 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2296 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2297 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2298 rtnl_unlock();
2299 return err;
2300 }
2301
2302 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2303 {
2304 struct in6_ifreq ireq;
2305 int err;
2306
2307 if (!capable(CAP_NET_ADMIN))
2308 return -EPERM;
2309
2310 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2311 return -EFAULT;
2312
2313 rtnl_lock();
2314 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2315 ireq.ifr6_prefixlen);
2316 rtnl_unlock();
2317 return err;
2318 }
2319
2320 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2321 int plen, int scope)
2322 {
2323 struct inet6_ifaddr *ifp;
2324
2325 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT);
2326 if (!IS_ERR(ifp)) {
2327 spin_lock_bh(&ifp->lock);
2328 ifp->flags &= ~IFA_F_TENTATIVE;
2329 spin_unlock_bh(&ifp->lock);
2330 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2331 in6_ifa_put(ifp);
2332 }
2333 }
2334
2335 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2336 static void sit_add_v4_addrs(struct inet6_dev *idev)
2337 {
2338 struct in6_addr addr;
2339 struct net_device *dev;
2340 struct net *net = dev_net(idev->dev);
2341 int scope;
2342
2343 ASSERT_RTNL();
2344
2345 memset(&addr, 0, sizeof(struct in6_addr));
2346 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2347
2348 if (idev->dev->flags&IFF_POINTOPOINT) {
2349 addr.s6_addr32[0] = htonl(0xfe800000);
2350 scope = IFA_LINK;
2351 } else {
2352 scope = IPV6_ADDR_COMPATv4;
2353 }
2354
2355 if (addr.s6_addr32[3]) {
2356 add_addr(idev, &addr, 128, scope);
2357 return;
2358 }
2359
2360 for_each_netdev(net, dev) {
2361 struct in_device *in_dev = __in_dev_get_rtnl(dev);
2362 if (in_dev && (dev->flags & IFF_UP)) {
2363 struct in_ifaddr *ifa;
2364
2365 int flag = scope;
2366
2367 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2368 int plen;
2369
2370 addr.s6_addr32[3] = ifa->ifa_local;
2371
2372 if (ifa->ifa_scope == RT_SCOPE_LINK)
2373 continue;
2374 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2375 if (idev->dev->flags&IFF_POINTOPOINT)
2376 continue;
2377 flag |= IFA_HOST;
2378 }
2379 if (idev->dev->flags&IFF_POINTOPOINT)
2380 plen = 64;
2381 else
2382 plen = 96;
2383
2384 add_addr(idev, &addr, plen, flag);
2385 }
2386 }
2387 }
2388 }
2389 #endif
2390
2391 static void init_loopback(struct net_device *dev)
2392 {
2393 struct inet6_dev *idev;
2394
2395 /* ::1 */
2396
2397 ASSERT_RTNL();
2398
2399 if ((idev = ipv6_find_idev(dev)) == NULL) {
2400 pr_debug("%s: add_dev failed\n", __func__);
2401 return;
2402 }
2403
2404 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2405 }
2406
2407 static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr)
2408 {
2409 struct inet6_ifaddr *ifp;
2410 u32 addr_flags = IFA_F_PERMANENT;
2411
2412 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2413 if (idev->cnf.optimistic_dad &&
2414 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2415 addr_flags |= IFA_F_OPTIMISTIC;
2416 #endif
2417
2418
2419 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2420 if (!IS_ERR(ifp)) {
2421 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2422 addrconf_dad_start(ifp);
2423 in6_ifa_put(ifp);
2424 }
2425 }
2426
2427 static void addrconf_dev_config(struct net_device *dev)
2428 {
2429 struct in6_addr addr;
2430 struct inet6_dev *idev;
2431
2432 ASSERT_RTNL();
2433
2434 if ((dev->type != ARPHRD_ETHER) &&
2435 (dev->type != ARPHRD_FDDI) &&
2436 (dev->type != ARPHRD_ARCNET) &&
2437 (dev->type != ARPHRD_INFINIBAND) &&
2438 (dev->type != ARPHRD_IEEE802154)) {
2439 /* Alas, we support only Ethernet autoconfiguration. */
2440 return;
2441 }
2442
2443 idev = addrconf_add_dev(dev);
2444 if (IS_ERR(idev))
2445 return;
2446
2447 memset(&addr, 0, sizeof(struct in6_addr));
2448 addr.s6_addr32[0] = htonl(0xFE800000);
2449
2450 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2451 addrconf_add_linklocal(idev, &addr);
2452 }
2453
2454 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2455 static void addrconf_sit_config(struct net_device *dev)
2456 {
2457 struct inet6_dev *idev;
2458
2459 ASSERT_RTNL();
2460
2461 /*
2462 * Configure the tunnel with one of our IPv4
2463 * addresses... we should configure all of
2464 * our v4 addrs in the tunnel
2465 */
2466
2467 if ((idev = ipv6_find_idev(dev)) == NULL) {
2468 pr_debug("%s: add_dev failed\n", __func__);
2469 return;
2470 }
2471
2472 if (dev->priv_flags & IFF_ISATAP) {
2473 struct in6_addr addr;
2474
2475 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2476 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2477 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2478 addrconf_add_linklocal(idev, &addr);
2479 return;
2480 }
2481
2482 sit_add_v4_addrs(idev);
2483
2484 if (dev->flags&IFF_POINTOPOINT) {
2485 addrconf_add_mroute(dev);
2486 addrconf_add_lroute(dev);
2487 } else
2488 sit_route_add(dev);
2489 }
2490 #endif
2491
2492 #if defined(CONFIG_NET_IPGRE) || defined(CONFIG_NET_IPGRE_MODULE)
2493 static void addrconf_gre_config(struct net_device *dev)
2494 {
2495 struct inet6_dev *idev;
2496 struct in6_addr addr;
2497
2498 pr_info("%s(%s)\n", __func__, dev->name);
2499
2500 ASSERT_RTNL();
2501
2502 if ((idev = ipv6_find_idev(dev)) == NULL) {
2503 pr_debug("%s: add_dev failed\n", __func__);
2504 return;
2505 }
2506
2507 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2508 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2509
2510 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2511 addrconf_add_linklocal(idev, &addr);
2512 }
2513 #endif
2514
2515 static inline int
2516 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2517 {
2518 struct in6_addr lladdr;
2519
2520 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2521 addrconf_add_linklocal(idev, &lladdr);
2522 return 0;
2523 }
2524 return -1;
2525 }
2526
2527 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2528 {
2529 struct net_device *link_dev;
2530 struct net *net = dev_net(idev->dev);
2531
2532 /* first try to inherit the link-local address from the link device */
2533 if (idev->dev->iflink &&
2534 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
2535 if (!ipv6_inherit_linklocal(idev, link_dev))
2536 return;
2537 }
2538 /* then try to inherit it from any device */
2539 for_each_netdev(net, link_dev) {
2540 if (!ipv6_inherit_linklocal(idev, link_dev))
2541 return;
2542 }
2543 pr_debug("init ip6-ip6: add_linklocal failed\n");
2544 }
2545
2546 /*
2547 * Autoconfigure tunnel with a link-local address so routing protocols,
2548 * DHCPv6, MLD etc. can be run over the virtual link
2549 */
2550
2551 static void addrconf_ip6_tnl_config(struct net_device *dev)
2552 {
2553 struct inet6_dev *idev;
2554
2555 ASSERT_RTNL();
2556
2557 idev = addrconf_add_dev(dev);
2558 if (IS_ERR(idev)) {
2559 pr_debug("init ip6-ip6: add_dev failed\n");
2560 return;
2561 }
2562 ip6_tnl_add_linklocal(idev);
2563 }
2564
2565 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2566 void *data)
2567 {
2568 struct net_device *dev = (struct net_device *) data;
2569 struct inet6_dev *idev = __in6_dev_get(dev);
2570 int run_pending = 0;
2571 int err;
2572
2573 switch (event) {
2574 case NETDEV_REGISTER:
2575 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2576 idev = ipv6_add_dev(dev);
2577 if (!idev)
2578 return notifier_from_errno(-ENOMEM);
2579 }
2580 break;
2581
2582 case NETDEV_UP:
2583 case NETDEV_CHANGE:
2584 if (dev->flags & IFF_SLAVE)
2585 break;
2586
2587 if (event == NETDEV_UP) {
2588 if (!addrconf_qdisc_ok(dev)) {
2589 /* device is not ready yet. */
2590 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
2591 dev->name);
2592 break;
2593 }
2594
2595 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2596 idev = ipv6_add_dev(dev);
2597
2598 if (idev) {
2599 idev->if_flags |= IF_READY;
2600 run_pending = 1;
2601 }
2602 } else {
2603 if (!addrconf_qdisc_ok(dev)) {
2604 /* device is still not ready. */
2605 break;
2606 }
2607
2608 if (idev) {
2609 if (idev->if_flags & IF_READY)
2610 /* device is already configured. */
2611 break;
2612 idev->if_flags |= IF_READY;
2613 }
2614
2615 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
2616 dev->name);
2617
2618 run_pending = 1;
2619 }
2620
2621 switch (dev->type) {
2622 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2623 case ARPHRD_SIT:
2624 addrconf_sit_config(dev);
2625 break;
2626 #endif
2627 #if defined(CONFIG_NET_IPGRE) || defined(CONFIG_NET_IPGRE_MODULE)
2628 case ARPHRD_IPGRE:
2629 addrconf_gre_config(dev);
2630 break;
2631 #endif
2632 case ARPHRD_TUNNEL6:
2633 addrconf_ip6_tnl_config(dev);
2634 break;
2635 case ARPHRD_LOOPBACK:
2636 init_loopback(dev);
2637 break;
2638
2639 default:
2640 addrconf_dev_config(dev);
2641 break;
2642 }
2643
2644 if (idev) {
2645 if (run_pending)
2646 addrconf_dad_run(idev);
2647
2648 /*
2649 * If the MTU changed during the interface down,
2650 * when the interface up, the changed MTU must be
2651 * reflected in the idev as well as routers.
2652 */
2653 if (idev->cnf.mtu6 != dev->mtu &&
2654 dev->mtu >= IPV6_MIN_MTU) {
2655 rt6_mtu_change(dev, dev->mtu);
2656 idev->cnf.mtu6 = dev->mtu;
2657 }
2658 idev->tstamp = jiffies;
2659 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2660
2661 /*
2662 * If the changed mtu during down is lower than
2663 * IPV6_MIN_MTU stop IPv6 on this interface.
2664 */
2665 if (dev->mtu < IPV6_MIN_MTU)
2666 addrconf_ifdown(dev, 1);
2667 }
2668 break;
2669
2670 case NETDEV_CHANGEMTU:
2671 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2672 rt6_mtu_change(dev, dev->mtu);
2673 idev->cnf.mtu6 = dev->mtu;
2674 break;
2675 }
2676
2677 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2678 idev = ipv6_add_dev(dev);
2679 if (idev)
2680 break;
2681 }
2682
2683 /*
2684 * MTU falled under IPV6_MIN_MTU.
2685 * Stop IPv6 on this interface.
2686 */
2687
2688 case NETDEV_DOWN:
2689 case NETDEV_UNREGISTER:
2690 /*
2691 * Remove all addresses from this interface.
2692 */
2693 addrconf_ifdown(dev, event != NETDEV_DOWN);
2694 break;
2695
2696 case NETDEV_CHANGENAME:
2697 if (idev) {
2698 snmp6_unregister_dev(idev);
2699 addrconf_sysctl_unregister(idev);
2700 addrconf_sysctl_register(idev);
2701 err = snmp6_register_dev(idev);
2702 if (err)
2703 return notifier_from_errno(err);
2704 }
2705 break;
2706
2707 case NETDEV_PRE_TYPE_CHANGE:
2708 case NETDEV_POST_TYPE_CHANGE:
2709 addrconf_type_change(dev, event);
2710 break;
2711 }
2712
2713 return NOTIFY_OK;
2714 }
2715
2716 /*
2717 * addrconf module should be notified of a device going up
2718 */
2719 static struct notifier_block ipv6_dev_notf = {
2720 .notifier_call = addrconf_notify,
2721 };
2722
2723 static void addrconf_type_change(struct net_device *dev, unsigned long event)
2724 {
2725 struct inet6_dev *idev;
2726 ASSERT_RTNL();
2727
2728 idev = __in6_dev_get(dev);
2729
2730 if (event == NETDEV_POST_TYPE_CHANGE)
2731 ipv6_mc_remap(idev);
2732 else if (event == NETDEV_PRE_TYPE_CHANGE)
2733 ipv6_mc_unmap(idev);
2734 }
2735
2736 static int addrconf_ifdown(struct net_device *dev, int how)
2737 {
2738 struct net *net = dev_net(dev);
2739 struct inet6_dev *idev;
2740 struct inet6_ifaddr *ifa;
2741 int state, i;
2742
2743 ASSERT_RTNL();
2744
2745 rt6_ifdown(net, dev);
2746 neigh_ifdown(&nd_tbl, dev);
2747
2748 idev = __in6_dev_get(dev);
2749 if (idev == NULL)
2750 return -ENODEV;
2751
2752 /*
2753 * Step 1: remove reference to ipv6 device from parent device.
2754 * Do not dev_put!
2755 */
2756 if (how) {
2757 idev->dead = 1;
2758
2759 /* protected by rtnl_lock */
2760 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
2761
2762 /* Step 1.5: remove snmp6 entry */
2763 snmp6_unregister_dev(idev);
2764
2765 }
2766
2767 /* Step 2: clear hash table */
2768 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
2769 struct hlist_head *h = &inet6_addr_lst[i];
2770 struct hlist_node *n;
2771
2772 spin_lock_bh(&addrconf_hash_lock);
2773 restart:
2774 hlist_for_each_entry_rcu(ifa, n, h, addr_lst) {
2775 if (ifa->idev == idev) {
2776 hlist_del_init_rcu(&ifa->addr_lst);
2777 addrconf_del_timer(ifa);
2778 goto restart;
2779 }
2780 }
2781 spin_unlock_bh(&addrconf_hash_lock);
2782 }
2783
2784 write_lock_bh(&idev->lock);
2785
2786 /* Step 2: clear flags for stateless addrconf */
2787 if (!how)
2788 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2789
2790 #ifdef CONFIG_IPV6_PRIVACY
2791 if (how && del_timer(&idev->regen_timer))
2792 in6_dev_put(idev);
2793
2794 /* Step 3: clear tempaddr list */
2795 while (!list_empty(&idev->tempaddr_list)) {
2796 ifa = list_first_entry(&idev->tempaddr_list,
2797 struct inet6_ifaddr, tmp_list);
2798 list_del(&ifa->tmp_list);
2799 write_unlock_bh(&idev->lock);
2800 spin_lock_bh(&ifa->lock);
2801
2802 if (ifa->ifpub) {
2803 in6_ifa_put(ifa->ifpub);
2804 ifa->ifpub = NULL;
2805 }
2806 spin_unlock_bh(&ifa->lock);
2807 in6_ifa_put(ifa);
2808 write_lock_bh(&idev->lock);
2809 }
2810 #endif
2811
2812 while (!list_empty(&idev->addr_list)) {
2813 ifa = list_first_entry(&idev->addr_list,
2814 struct inet6_ifaddr, if_list);
2815 addrconf_del_timer(ifa);
2816
2817 list_del(&ifa->if_list);
2818
2819 write_unlock_bh(&idev->lock);
2820
2821 spin_lock_bh(&ifa->state_lock);
2822 state = ifa->state;
2823 ifa->state = INET6_IFADDR_STATE_DEAD;
2824 spin_unlock_bh(&ifa->state_lock);
2825
2826 if (state != INET6_IFADDR_STATE_DEAD) {
2827 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2828 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2829 }
2830 in6_ifa_put(ifa);
2831
2832 write_lock_bh(&idev->lock);
2833 }
2834
2835 write_unlock_bh(&idev->lock);
2836
2837 /* Step 5: Discard multicast list */
2838 if (how)
2839 ipv6_mc_destroy_dev(idev);
2840 else
2841 ipv6_mc_down(idev);
2842
2843 idev->tstamp = jiffies;
2844
2845 /* Last: Shot the device (if unregistered) */
2846 if (how) {
2847 addrconf_sysctl_unregister(idev);
2848 neigh_parms_release(&nd_tbl, idev->nd_parms);
2849 neigh_ifdown(&nd_tbl, dev);
2850 in6_dev_put(idev);
2851 }
2852 return 0;
2853 }
2854
2855 static void addrconf_rs_timer(unsigned long data)
2856 {
2857 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2858 struct inet6_dev *idev = ifp->idev;
2859
2860 read_lock(&idev->lock);
2861 if (idev->dead || !(idev->if_flags & IF_READY))
2862 goto out;
2863
2864 if (idev->cnf.forwarding)
2865 goto out;
2866
2867 /* Announcement received after solicitation was sent */
2868 if (idev->if_flags & IF_RA_RCVD)
2869 goto out;
2870
2871 spin_lock(&ifp->lock);
2872 if (ifp->probes++ < idev->cnf.rtr_solicits) {
2873 /* The wait after the last probe can be shorter */
2874 addrconf_mod_timer(ifp, AC_RS,
2875 (ifp->probes == idev->cnf.rtr_solicits) ?
2876 idev->cnf.rtr_solicit_delay :
2877 idev->cnf.rtr_solicit_interval);
2878 spin_unlock(&ifp->lock);
2879
2880 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2881 } else {
2882 spin_unlock(&ifp->lock);
2883 /*
2884 * Note: we do not support deprecated "all on-link"
2885 * assumption any longer.
2886 */
2887 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
2888 }
2889
2890 out:
2891 read_unlock(&idev->lock);
2892 in6_ifa_put(ifp);
2893 }
2894
2895 /*
2896 * Duplicate Address Detection
2897 */
2898 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2899 {
2900 unsigned long rand_num;
2901 struct inet6_dev *idev = ifp->idev;
2902
2903 if (ifp->flags & IFA_F_OPTIMISTIC)
2904 rand_num = 0;
2905 else
2906 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2907
2908 ifp->probes = idev->cnf.dad_transmits;
2909 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2910 }
2911
2912 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
2913 {
2914 struct inet6_dev *idev = ifp->idev;
2915 struct net_device *dev = idev->dev;
2916
2917 addrconf_join_solict(dev, &ifp->addr);
2918
2919 net_srandom(ifp->addr.s6_addr32[3]);
2920
2921 read_lock_bh(&idev->lock);
2922 spin_lock(&ifp->lock);
2923 if (ifp->state == INET6_IFADDR_STATE_DEAD)
2924 goto out;
2925
2926 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2927 idev->cnf.accept_dad < 1 ||
2928 !(ifp->flags&IFA_F_TENTATIVE) ||
2929 ifp->flags & IFA_F_NODAD) {
2930 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
2931 spin_unlock(&ifp->lock);
2932 read_unlock_bh(&idev->lock);
2933
2934 addrconf_dad_completed(ifp);
2935 return;
2936 }
2937
2938 if (!(idev->if_flags & IF_READY)) {
2939 spin_unlock(&ifp->lock);
2940 read_unlock_bh(&idev->lock);
2941 /*
2942 * If the device is not ready:
2943 * - keep it tentative if it is a permanent address.
2944 * - otherwise, kill it.
2945 */
2946 in6_ifa_hold(ifp);
2947 addrconf_dad_stop(ifp, 0);
2948 return;
2949 }
2950
2951 /*
2952 * Optimistic nodes can start receiving
2953 * Frames right away
2954 */
2955 if (ifp->flags & IFA_F_OPTIMISTIC)
2956 ip6_ins_rt(ifp->rt);
2957
2958 addrconf_dad_kick(ifp);
2959 out:
2960 spin_unlock(&ifp->lock);
2961 read_unlock_bh(&idev->lock);
2962 }
2963
2964 static void addrconf_dad_timer(unsigned long data)
2965 {
2966 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2967 struct inet6_dev *idev = ifp->idev;
2968 struct in6_addr mcaddr;
2969
2970 if (!ifp->probes && addrconf_dad_end(ifp))
2971 goto out;
2972
2973 read_lock(&idev->lock);
2974 if (idev->dead || !(idev->if_flags & IF_READY)) {
2975 read_unlock(&idev->lock);
2976 goto out;
2977 }
2978
2979 spin_lock(&ifp->lock);
2980 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
2981 spin_unlock(&ifp->lock);
2982 read_unlock(&idev->lock);
2983 goto out;
2984 }
2985
2986 if (ifp->probes == 0) {
2987 /*
2988 * DAD was successful
2989 */
2990
2991 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
2992 spin_unlock(&ifp->lock);
2993 read_unlock(&idev->lock);
2994
2995 addrconf_dad_completed(ifp);
2996
2997 goto out;
2998 }
2999
3000 ifp->probes--;
3001 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
3002 spin_unlock(&ifp->lock);
3003 read_unlock(&idev->lock);
3004
3005 /* send a neighbour solicitation for our addr */
3006 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3007 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
3008 out:
3009 in6_ifa_put(ifp);
3010 }
3011
3012 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3013 {
3014 struct net_device *dev = ifp->idev->dev;
3015
3016 /*
3017 * Configure the address for reception. Now it is valid.
3018 */
3019
3020 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3021
3022 /* If added prefix is link local and we are prepared to process
3023 router advertisements, start sending router solicitations.
3024 */
3025
3026 if (((ifp->idev->cnf.accept_ra == 1 && !ifp->idev->cnf.forwarding) ||
3027 ifp->idev->cnf.accept_ra == 2) &&
3028 ifp->idev->cnf.rtr_solicits > 0 &&
3029 (dev->flags&IFF_LOOPBACK) == 0 &&
3030 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
3031 /*
3032 * If a host as already performed a random delay
3033 * [...] as part of DAD [...] there is no need
3034 * to delay again before sending the first RS
3035 */
3036 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
3037
3038 spin_lock_bh(&ifp->lock);
3039 ifp->probes = 1;
3040 ifp->idev->if_flags |= IF_RS_SENT;
3041 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
3042 spin_unlock_bh(&ifp->lock);
3043 }
3044 }
3045
3046 static void addrconf_dad_run(struct inet6_dev *idev)
3047 {
3048 struct inet6_ifaddr *ifp;
3049
3050 read_lock_bh(&idev->lock);
3051 list_for_each_entry(ifp, &idev->addr_list, if_list) {
3052 spin_lock(&ifp->lock);
3053 if (ifp->flags & IFA_F_TENTATIVE &&
3054 ifp->state == INET6_IFADDR_STATE_DAD)
3055 addrconf_dad_kick(ifp);
3056 spin_unlock(&ifp->lock);
3057 }
3058 read_unlock_bh(&idev->lock);
3059 }
3060
3061 #ifdef CONFIG_PROC_FS
3062 struct if6_iter_state {
3063 struct seq_net_private p;
3064 int bucket;
3065 int offset;
3066 };
3067
3068 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
3069 {
3070 struct inet6_ifaddr *ifa = NULL;
3071 struct if6_iter_state *state = seq->private;
3072 struct net *net = seq_file_net(seq);
3073 int p = 0;
3074
3075 /* initial bucket if pos is 0 */
3076 if (pos == 0) {
3077 state->bucket = 0;
3078 state->offset = 0;
3079 }
3080
3081 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3082 struct hlist_node *n;
3083 hlist_for_each_entry_rcu_bh(ifa, n, &inet6_addr_lst[state->bucket],
3084 addr_lst) {
3085 /* sync with offset */
3086 if (p < state->offset) {
3087 p++;
3088 continue;
3089 }
3090 state->offset++;
3091 if (net_eq(dev_net(ifa->idev->dev), net))
3092 return ifa;
3093 }
3094
3095 /* prepare for next bucket */
3096 state->offset = 0;
3097 p = 0;
3098 }
3099 return NULL;
3100 }
3101
3102 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3103 struct inet6_ifaddr *ifa)
3104 {
3105 struct if6_iter_state *state = seq->private;
3106 struct net *net = seq_file_net(seq);
3107 struct hlist_node *n = &ifa->addr_lst;
3108
3109 hlist_for_each_entry_continue_rcu_bh(ifa, n, addr_lst) {
3110 state->offset++;
3111 if (net_eq(dev_net(ifa->idev->dev), net))
3112 return ifa;
3113 }
3114
3115 while (++state->bucket < IN6_ADDR_HSIZE) {
3116 state->offset = 0;
3117 hlist_for_each_entry_rcu_bh(ifa, n,
3118 &inet6_addr_lst[state->bucket], addr_lst) {
3119 state->offset++;
3120 if (net_eq(dev_net(ifa->idev->dev), net))
3121 return ifa;
3122 }
3123 }
3124
3125 return NULL;
3126 }
3127
3128 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3129 __acquires(rcu_bh)
3130 {
3131 rcu_read_lock_bh();
3132 return if6_get_first(seq, *pos);
3133 }
3134
3135 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3136 {
3137 struct inet6_ifaddr *ifa;
3138
3139 ifa = if6_get_next(seq, v);
3140 ++*pos;
3141 return ifa;
3142 }
3143
3144 static void if6_seq_stop(struct seq_file *seq, void *v)
3145 __releases(rcu_bh)
3146 {
3147 rcu_read_unlock_bh();
3148 }
3149
3150 static int if6_seq_show(struct seq_file *seq, void *v)
3151 {
3152 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3153 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3154 &ifp->addr,
3155 ifp->idev->dev->ifindex,
3156 ifp->prefix_len,
3157 ifp->scope,
3158 ifp->flags,
3159 ifp->idev->dev->name);
3160 return 0;
3161 }
3162
3163 static const struct seq_operations if6_seq_ops = {
3164 .start = if6_seq_start,
3165 .next = if6_seq_next,
3166 .show = if6_seq_show,
3167 .stop = if6_seq_stop,
3168 };
3169
3170 static int if6_seq_open(struct inode *inode, struct file *file)
3171 {
3172 return seq_open_net(inode, file, &if6_seq_ops,
3173 sizeof(struct if6_iter_state));
3174 }
3175
3176 static const struct file_operations if6_fops = {
3177 .owner = THIS_MODULE,
3178 .open = if6_seq_open,
3179 .read = seq_read,
3180 .llseek = seq_lseek,
3181 .release = seq_release_net,
3182 };
3183
3184 static int __net_init if6_proc_net_init(struct net *net)
3185 {
3186 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
3187 return -ENOMEM;
3188 return 0;
3189 }
3190
3191 static void __net_exit if6_proc_net_exit(struct net *net)
3192 {
3193 proc_net_remove(net, "if_inet6");
3194 }
3195
3196 static struct pernet_operations if6_proc_net_ops = {
3197 .init = if6_proc_net_init,
3198 .exit = if6_proc_net_exit,
3199 };
3200
3201 int __init if6_proc_init(void)
3202 {
3203 return register_pernet_subsys(&if6_proc_net_ops);
3204 }
3205
3206 void if6_proc_exit(void)
3207 {
3208 unregister_pernet_subsys(&if6_proc_net_ops);
3209 }
3210 #endif /* CONFIG_PROC_FS */
3211
3212 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3213 /* Check if address is a home address configured on any interface. */
3214 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3215 {
3216 int ret = 0;
3217 struct inet6_ifaddr *ifp = NULL;
3218 struct hlist_node *n;
3219 unsigned int hash = inet6_addr_hash(addr);
3220
3221 rcu_read_lock_bh();
3222 hlist_for_each_entry_rcu_bh(ifp, n, &inet6_addr_lst[hash], addr_lst) {
3223 if (!net_eq(dev_net(ifp->idev->dev), net))
3224 continue;
3225 if (ipv6_addr_equal(&ifp->addr, addr) &&
3226 (ifp->flags & IFA_F_HOMEADDRESS)) {
3227 ret = 1;
3228 break;
3229 }
3230 }
3231 rcu_read_unlock_bh();
3232 return ret;
3233 }
3234 #endif
3235
3236 /*
3237 * Periodic address status verification
3238 */
3239
3240 static void addrconf_verify(unsigned long foo)
3241 {
3242 unsigned long now, next, next_sec, next_sched;
3243 struct inet6_ifaddr *ifp;
3244 struct hlist_node *node;
3245 int i;
3246
3247 rcu_read_lock_bh();
3248 spin_lock(&addrconf_verify_lock);
3249 now = jiffies;
3250 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3251
3252 del_timer(&addr_chk_timer);
3253
3254 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3255 restart:
3256 hlist_for_each_entry_rcu_bh(ifp, node,
3257 &inet6_addr_lst[i], addr_lst) {
3258 unsigned long age;
3259
3260 if (ifp->flags & IFA_F_PERMANENT)
3261 continue;
3262
3263 spin_lock(&ifp->lock);
3264 /* We try to batch several events at once. */
3265 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3266
3267 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3268 age >= ifp->valid_lft) {
3269 spin_unlock(&ifp->lock);
3270 in6_ifa_hold(ifp);
3271 ipv6_del_addr(ifp);
3272 goto restart;
3273 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3274 spin_unlock(&ifp->lock);
3275 continue;
3276 } else if (age >= ifp->prefered_lft) {
3277 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3278 int deprecate = 0;
3279
3280 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3281 deprecate = 1;
3282 ifp->flags |= IFA_F_DEPRECATED;
3283 }
3284
3285 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3286 next = ifp->tstamp + ifp->valid_lft * HZ;
3287
3288 spin_unlock(&ifp->lock);
3289
3290 if (deprecate) {
3291 in6_ifa_hold(ifp);
3292
3293 ipv6_ifa_notify(0, ifp);
3294 in6_ifa_put(ifp);
3295 goto restart;
3296 }
3297 #ifdef CONFIG_IPV6_PRIVACY
3298 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3299 !(ifp->flags&IFA_F_TENTATIVE)) {
3300 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3301 ifp->idev->cnf.dad_transmits *
3302 ifp->idev->nd_parms->retrans_time / HZ;
3303
3304 if (age >= ifp->prefered_lft - regen_advance) {
3305 struct inet6_ifaddr *ifpub = ifp->ifpub;
3306 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3307 next = ifp->tstamp + ifp->prefered_lft * HZ;
3308 if (!ifp->regen_count && ifpub) {
3309 ifp->regen_count++;
3310 in6_ifa_hold(ifp);
3311 in6_ifa_hold(ifpub);
3312 spin_unlock(&ifp->lock);
3313
3314 spin_lock(&ifpub->lock);
3315 ifpub->regen_count = 0;
3316 spin_unlock(&ifpub->lock);
3317 ipv6_create_tempaddr(ifpub, ifp);
3318 in6_ifa_put(ifpub);
3319 in6_ifa_put(ifp);
3320 goto restart;
3321 }
3322 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3323 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3324 spin_unlock(&ifp->lock);
3325 #endif
3326 } else {
3327 /* ifp->prefered_lft <= ifp->valid_lft */
3328 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3329 next = ifp->tstamp + ifp->prefered_lft * HZ;
3330 spin_unlock(&ifp->lock);
3331 }
3332 }
3333 }
3334
3335 next_sec = round_jiffies_up(next);
3336 next_sched = next;
3337
3338 /* If rounded timeout is accurate enough, accept it. */
3339 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3340 next_sched = next_sec;
3341
3342 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3343 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3344 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3345
3346 ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3347 now, next, next_sec, next_sched));
3348
3349 addr_chk_timer.expires = next_sched;
3350 add_timer(&addr_chk_timer);
3351 spin_unlock(&addrconf_verify_lock);
3352 rcu_read_unlock_bh();
3353 }
3354
3355 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3356 {
3357 struct in6_addr *pfx = NULL;
3358
3359 if (addr)
3360 pfx = nla_data(addr);
3361
3362 if (local) {
3363 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3364 pfx = NULL;
3365 else
3366 pfx = nla_data(local);
3367 }
3368
3369 return pfx;
3370 }
3371
3372 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3373 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3374 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3375 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3376 };
3377
3378 static int
3379 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3380 {
3381 struct net *net = sock_net(skb->sk);
3382 struct ifaddrmsg *ifm;
3383 struct nlattr *tb[IFA_MAX+1];
3384 struct in6_addr *pfx;
3385 int err;
3386
3387 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3388 if (err < 0)
3389 return err;
3390
3391 ifm = nlmsg_data(nlh);
3392 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3393 if (pfx == NULL)
3394 return -EINVAL;
3395
3396 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3397 }
3398
3399 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3400 u32 prefered_lft, u32 valid_lft)
3401 {
3402 u32 flags;
3403 clock_t expires;
3404 unsigned long timeout;
3405
3406 if (!valid_lft || (prefered_lft > valid_lft))
3407 return -EINVAL;
3408
3409 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3410 if (addrconf_finite_timeout(timeout)) {
3411 expires = jiffies_to_clock_t(timeout * HZ);
3412 valid_lft = timeout;
3413 flags = RTF_EXPIRES;
3414 } else {
3415 expires = 0;
3416 flags = 0;
3417 ifa_flags |= IFA_F_PERMANENT;
3418 }
3419
3420 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3421 if (addrconf_finite_timeout(timeout)) {
3422 if (timeout == 0)
3423 ifa_flags |= IFA_F_DEPRECATED;
3424 prefered_lft = timeout;
3425 }
3426
3427 spin_lock_bh(&ifp->lock);
3428 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3429 ifp->tstamp = jiffies;
3430 ifp->valid_lft = valid_lft;
3431 ifp->prefered_lft = prefered_lft;
3432
3433 spin_unlock_bh(&ifp->lock);
3434 if (!(ifp->flags&IFA_F_TENTATIVE))
3435 ipv6_ifa_notify(0, ifp);
3436
3437 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3438 expires, flags);
3439 addrconf_verify(0);
3440
3441 return 0;
3442 }
3443
3444 static int
3445 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3446 {
3447 struct net *net = sock_net(skb->sk);
3448 struct ifaddrmsg *ifm;
3449 struct nlattr *tb[IFA_MAX+1];
3450 struct in6_addr *pfx;
3451 struct inet6_ifaddr *ifa;
3452 struct net_device *dev;
3453 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3454 u8 ifa_flags;
3455 int err;
3456
3457 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3458 if (err < 0)
3459 return err;
3460
3461 ifm = nlmsg_data(nlh);
3462 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3463 if (pfx == NULL)
3464 return -EINVAL;
3465
3466 if (tb[IFA_CACHEINFO]) {
3467 struct ifa_cacheinfo *ci;
3468
3469 ci = nla_data(tb[IFA_CACHEINFO]);
3470 valid_lft = ci->ifa_valid;
3471 preferred_lft = ci->ifa_prefered;
3472 } else {
3473 preferred_lft = INFINITY_LIFE_TIME;
3474 valid_lft = INFINITY_LIFE_TIME;
3475 }
3476
3477 dev = __dev_get_by_index(net, ifm->ifa_index);
3478 if (dev == NULL)
3479 return -ENODEV;
3480
3481 /* We ignore other flags so far. */
3482 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3483
3484 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3485 if (ifa == NULL) {
3486 /*
3487 * It would be best to check for !NLM_F_CREATE here but
3488 * userspace alreay relies on not having to provide this.
3489 */
3490 return inet6_addr_add(net, ifm->ifa_index, pfx,
3491 ifm->ifa_prefixlen, ifa_flags,
3492 preferred_lft, valid_lft);
3493 }
3494
3495 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3496 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3497 err = -EEXIST;
3498 else
3499 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3500
3501 in6_ifa_put(ifa);
3502
3503 return err;
3504 }
3505
3506 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3507 u8 scope, int ifindex)
3508 {
3509 struct ifaddrmsg *ifm;
3510
3511 ifm = nlmsg_data(nlh);
3512 ifm->ifa_family = AF_INET6;
3513 ifm->ifa_prefixlen = prefixlen;
3514 ifm->ifa_flags = flags;
3515 ifm->ifa_scope = scope;
3516 ifm->ifa_index = ifindex;
3517 }
3518
3519 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3520 unsigned long tstamp, u32 preferred, u32 valid)
3521 {
3522 struct ifa_cacheinfo ci;
3523
3524 ci.cstamp = cstamp_delta(cstamp);
3525 ci.tstamp = cstamp_delta(tstamp);
3526 ci.ifa_prefered = preferred;
3527 ci.ifa_valid = valid;
3528
3529 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3530 }
3531
3532 static inline int rt_scope(int ifa_scope)
3533 {
3534 if (ifa_scope & IFA_HOST)
3535 return RT_SCOPE_HOST;
3536 else if (ifa_scope & IFA_LINK)
3537 return RT_SCOPE_LINK;
3538 else if (ifa_scope & IFA_SITE)
3539 return RT_SCOPE_SITE;
3540 else
3541 return RT_SCOPE_UNIVERSE;
3542 }
3543
3544 static inline int inet6_ifaddr_msgsize(void)
3545 {
3546 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3547 + nla_total_size(16) /* IFA_ADDRESS */
3548 + nla_total_size(sizeof(struct ifa_cacheinfo));
3549 }
3550
3551 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3552 u32 pid, u32 seq, int event, unsigned int flags)
3553 {
3554 struct nlmsghdr *nlh;
3555 u32 preferred, valid;
3556
3557 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3558 if (nlh == NULL)
3559 return -EMSGSIZE;
3560
3561 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3562 ifa->idev->dev->ifindex);
3563
3564 if (!(ifa->flags&IFA_F_PERMANENT)) {
3565 preferred = ifa->prefered_lft;
3566 valid = ifa->valid_lft;
3567 if (preferred != INFINITY_LIFE_TIME) {
3568 long tval = (jiffies - ifa->tstamp)/HZ;
3569 if (preferred > tval)
3570 preferred -= tval;
3571 else
3572 preferred = 0;
3573 if (valid != INFINITY_LIFE_TIME) {
3574 if (valid > tval)
3575 valid -= tval;
3576 else
3577 valid = 0;
3578 }
3579 }
3580 } else {
3581 preferred = INFINITY_LIFE_TIME;
3582 valid = INFINITY_LIFE_TIME;
3583 }
3584
3585 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3586 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3587 nlmsg_cancel(skb, nlh);
3588 return -EMSGSIZE;
3589 }
3590
3591 return nlmsg_end(skb, nlh);
3592 }
3593
3594 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3595 u32 pid, u32 seq, int event, u16 flags)
3596 {
3597 struct nlmsghdr *nlh;
3598 u8 scope = RT_SCOPE_UNIVERSE;
3599 int ifindex = ifmca->idev->dev->ifindex;
3600
3601 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3602 scope = RT_SCOPE_SITE;
3603
3604 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3605 if (nlh == NULL)
3606 return -EMSGSIZE;
3607
3608 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3609 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3610 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3611 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3612 nlmsg_cancel(skb, nlh);
3613 return -EMSGSIZE;
3614 }
3615
3616 return nlmsg_end(skb, nlh);
3617 }
3618
3619 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3620 u32 pid, u32 seq, int event, unsigned int flags)
3621 {
3622 struct nlmsghdr *nlh;
3623 u8 scope = RT_SCOPE_UNIVERSE;
3624 int ifindex = ifaca->aca_idev->dev->ifindex;
3625
3626 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3627 scope = RT_SCOPE_SITE;
3628
3629 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3630 if (nlh == NULL)
3631 return -EMSGSIZE;
3632
3633 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3634 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3635 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3636 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3637 nlmsg_cancel(skb, nlh);
3638 return -EMSGSIZE;
3639 }
3640
3641 return nlmsg_end(skb, nlh);
3642 }
3643
3644 enum addr_type_t {
3645 UNICAST_ADDR,
3646 MULTICAST_ADDR,
3647 ANYCAST_ADDR,
3648 };
3649
3650 /* called with rcu_read_lock() */
3651 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3652 struct netlink_callback *cb, enum addr_type_t type,
3653 int s_ip_idx, int *p_ip_idx)
3654 {
3655 struct ifmcaddr6 *ifmca;
3656 struct ifacaddr6 *ifaca;
3657 int err = 1;
3658 int ip_idx = *p_ip_idx;
3659
3660 read_lock_bh(&idev->lock);
3661 switch (type) {
3662 case UNICAST_ADDR: {
3663 struct inet6_ifaddr *ifa;
3664
3665 /* unicast address incl. temp addr */
3666 list_for_each_entry(ifa, &idev->addr_list, if_list) {
3667 if (++ip_idx < s_ip_idx)
3668 continue;
3669 err = inet6_fill_ifaddr(skb, ifa,
3670 NETLINK_CB(cb->skb).pid,
3671 cb->nlh->nlmsg_seq,
3672 RTM_NEWADDR,
3673 NLM_F_MULTI);
3674 if (err <= 0)
3675 break;
3676 }
3677 break;
3678 }
3679 case MULTICAST_ADDR:
3680 /* multicast address */
3681 for (ifmca = idev->mc_list; ifmca;
3682 ifmca = ifmca->next, ip_idx++) {
3683 if (ip_idx < s_ip_idx)
3684 continue;
3685 err = inet6_fill_ifmcaddr(skb, ifmca,
3686 NETLINK_CB(cb->skb).pid,
3687 cb->nlh->nlmsg_seq,
3688 RTM_GETMULTICAST,
3689 NLM_F_MULTI);
3690 if (err <= 0)
3691 break;
3692 }
3693 break;
3694 case ANYCAST_ADDR:
3695 /* anycast address */
3696 for (ifaca = idev->ac_list; ifaca;
3697 ifaca = ifaca->aca_next, ip_idx++) {
3698 if (ip_idx < s_ip_idx)
3699 continue;
3700 err = inet6_fill_ifacaddr(skb, ifaca,
3701 NETLINK_CB(cb->skb).pid,
3702 cb->nlh->nlmsg_seq,
3703 RTM_GETANYCAST,
3704 NLM_F_MULTI);
3705 if (err <= 0)
3706 break;
3707 }
3708 break;
3709 default:
3710 break;
3711 }
3712 read_unlock_bh(&idev->lock);
3713 *p_ip_idx = ip_idx;
3714 return err;
3715 }
3716
3717 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3718 enum addr_type_t type)
3719 {
3720 struct net *net = sock_net(skb->sk);
3721 int h, s_h;
3722 int idx, ip_idx;
3723 int s_idx, s_ip_idx;
3724 struct net_device *dev;
3725 struct inet6_dev *idev;
3726 struct hlist_head *head;
3727 struct hlist_node *node;
3728
3729 s_h = cb->args[0];
3730 s_idx = idx = cb->args[1];
3731 s_ip_idx = ip_idx = cb->args[2];
3732
3733 rcu_read_lock();
3734 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3735 idx = 0;
3736 head = &net->dev_index_head[h];
3737 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3738 if (idx < s_idx)
3739 goto cont;
3740 if (h > s_h || idx > s_idx)
3741 s_ip_idx = 0;
3742 ip_idx = 0;
3743 idev = __in6_dev_get(dev);
3744 if (!idev)
3745 goto cont;
3746
3747 if (in6_dump_addrs(idev, skb, cb, type,
3748 s_ip_idx, &ip_idx) <= 0)
3749 goto done;
3750 cont:
3751 idx++;
3752 }
3753 }
3754 done:
3755 rcu_read_unlock();
3756 cb->args[0] = h;
3757 cb->args[1] = idx;
3758 cb->args[2] = ip_idx;
3759
3760 return skb->len;
3761 }
3762
3763 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3764 {
3765 enum addr_type_t type = UNICAST_ADDR;
3766
3767 return inet6_dump_addr(skb, cb, type);
3768 }
3769
3770 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3771 {
3772 enum addr_type_t type = MULTICAST_ADDR;
3773
3774 return inet6_dump_addr(skb, cb, type);
3775 }
3776
3777
3778 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3779 {
3780 enum addr_type_t type = ANYCAST_ADDR;
3781
3782 return inet6_dump_addr(skb, cb, type);
3783 }
3784
3785 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
3786 void *arg)
3787 {
3788 struct net *net = sock_net(in_skb->sk);
3789 struct ifaddrmsg *ifm;
3790 struct nlattr *tb[IFA_MAX+1];
3791 struct in6_addr *addr = NULL;
3792 struct net_device *dev = NULL;
3793 struct inet6_ifaddr *ifa;
3794 struct sk_buff *skb;
3795 int err;
3796
3797 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3798 if (err < 0)
3799 goto errout;
3800
3801 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3802 if (addr == NULL) {
3803 err = -EINVAL;
3804 goto errout;
3805 }
3806
3807 ifm = nlmsg_data(nlh);
3808 if (ifm->ifa_index)
3809 dev = __dev_get_by_index(net, ifm->ifa_index);
3810
3811 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
3812 if (!ifa) {
3813 err = -EADDRNOTAVAIL;
3814 goto errout;
3815 }
3816
3817 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
3818 if (!skb) {
3819 err = -ENOBUFS;
3820 goto errout_ifa;
3821 }
3822
3823 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3824 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3825 if (err < 0) {
3826 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3827 WARN_ON(err == -EMSGSIZE);
3828 kfree_skb(skb);
3829 goto errout_ifa;
3830 }
3831 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
3832 errout_ifa:
3833 in6_ifa_put(ifa);
3834 errout:
3835 return err;
3836 }
3837
3838 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3839 {
3840 struct sk_buff *skb;
3841 struct net *net = dev_net(ifa->idev->dev);
3842 int err = -ENOBUFS;
3843
3844 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3845 if (skb == NULL)
3846 goto errout;
3847
3848 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3849 if (err < 0) {
3850 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3851 WARN_ON(err == -EMSGSIZE);
3852 kfree_skb(skb);
3853 goto errout;
3854 }
3855 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3856 return;
3857 errout:
3858 if (err < 0)
3859 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3860 }
3861
3862 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3863 __s32 *array, int bytes)
3864 {
3865 BUG_ON(bytes < (DEVCONF_MAX * 4));
3866
3867 memset(array, 0, bytes);
3868 array[DEVCONF_FORWARDING] = cnf->forwarding;
3869 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3870 array[DEVCONF_MTU6] = cnf->mtu6;
3871 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3872 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3873 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3874 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3875 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3876 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
3877 jiffies_to_msecs(cnf->rtr_solicit_interval);
3878 array[DEVCONF_RTR_SOLICIT_DELAY] =
3879 jiffies_to_msecs(cnf->rtr_solicit_delay);
3880 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3881 #ifdef CONFIG_IPV6_PRIVACY
3882 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3883 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3884 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3885 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3886 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3887 #endif
3888 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3889 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3890 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3891 #ifdef CONFIG_IPV6_ROUTER_PREF
3892 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3893 array[DEVCONF_RTR_PROBE_INTERVAL] =
3894 jiffies_to_msecs(cnf->rtr_probe_interval);
3895 #ifdef CONFIG_IPV6_ROUTE_INFO
3896 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3897 #endif
3898 #endif
3899 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3900 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3901 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3902 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3903 #endif
3904 #ifdef CONFIG_IPV6_MROUTE
3905 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
3906 #endif
3907 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
3908 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
3909 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
3910 }
3911
3912 static inline size_t inet6_ifla6_size(void)
3913 {
3914 return nla_total_size(4) /* IFLA_INET6_FLAGS */
3915 + nla_total_size(sizeof(struct ifla_cacheinfo))
3916 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3917 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3918 + nla_total_size(ICMP6_MIB_MAX * 8); /* IFLA_INET6_ICMP6STATS */
3919 }
3920
3921 static inline size_t inet6_if_nlmsg_size(void)
3922 {
3923 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3924 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3925 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3926 + nla_total_size(4) /* IFLA_MTU */
3927 + nla_total_size(4) /* IFLA_LINK */
3928 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
3929 }
3930
3931 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
3932 int items, int bytes)
3933 {
3934 int i;
3935 int pad = bytes - sizeof(u64) * items;
3936 BUG_ON(pad < 0);
3937
3938 /* Use put_unaligned() because stats may not be aligned for u64. */
3939 put_unaligned(items, &stats[0]);
3940 for (i = 1; i < items; i++)
3941 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
3942
3943 memset(&stats[items], 0, pad);
3944 }
3945
3946 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib,
3947 int items, int bytes, size_t syncpoff)
3948 {
3949 int i;
3950 int pad = bytes - sizeof(u64) * items;
3951 BUG_ON(pad < 0);
3952
3953 /* Use put_unaligned() because stats may not be aligned for u64. */
3954 put_unaligned(items, &stats[0]);
3955 for (i = 1; i < items; i++)
3956 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
3957
3958 memset(&stats[items], 0, pad);
3959 }
3960
3961 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3962 int bytes)
3963 {
3964 switch (attrtype) {
3965 case IFLA_INET6_STATS:
3966 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6,
3967 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
3968 break;
3969 case IFLA_INET6_ICMP6STATS:
3970 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
3971 break;
3972 }
3973 }
3974
3975 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
3976 {
3977 struct nlattr *nla;
3978 struct ifla_cacheinfo ci;
3979
3980 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
3981 goto nla_put_failure;
3982 ci.max_reasm_len = IPV6_MAXPLEN;
3983 ci.tstamp = cstamp_delta(idev->tstamp);
3984 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
3985 ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time);
3986 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
3987 goto nla_put_failure;
3988 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3989 if (nla == NULL)
3990 goto nla_put_failure;
3991 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
3992
3993 /* XXX - MC not implemented */
3994
3995 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3996 if (nla == NULL)
3997 goto nla_put_failure;
3998 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3999
4000 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4001 if (nla == NULL)
4002 goto nla_put_failure;
4003 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4004
4005 return 0;
4006
4007 nla_put_failure:
4008 return -EMSGSIZE;
4009 }
4010
4011 static size_t inet6_get_link_af_size(const struct net_device *dev)
4012 {
4013 if (!__in6_dev_get(dev))
4014 return 0;
4015
4016 return inet6_ifla6_size();
4017 }
4018
4019 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
4020 {
4021 struct inet6_dev *idev = __in6_dev_get(dev);
4022
4023 if (!idev)
4024 return -ENODATA;
4025
4026 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4027 return -EMSGSIZE;
4028
4029 return 0;
4030 }
4031
4032 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
4033 u32 pid, u32 seq, int event, unsigned int flags)
4034 {
4035 struct net_device *dev = idev->dev;
4036 struct ifinfomsg *hdr;
4037 struct nlmsghdr *nlh;
4038 void *protoinfo;
4039
4040 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
4041 if (nlh == NULL)
4042 return -EMSGSIZE;
4043
4044 hdr = nlmsg_data(nlh);
4045 hdr->ifi_family = AF_INET6;
4046 hdr->__ifi_pad = 0;
4047 hdr->ifi_type = dev->type;
4048 hdr->ifi_index = dev->ifindex;
4049 hdr->ifi_flags = dev_get_flags(dev);
4050 hdr->ifi_change = 0;
4051
4052 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4053 (dev->addr_len &&
4054 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4055 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4056 (dev->ifindex != dev->iflink &&
4057 nla_put_u32(skb, IFLA_LINK, dev->iflink)))
4058 goto nla_put_failure;
4059 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4060 if (protoinfo == NULL)
4061 goto nla_put_failure;
4062
4063 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4064 goto nla_put_failure;
4065
4066 nla_nest_end(skb, protoinfo);
4067 return nlmsg_end(skb, nlh);
4068
4069 nla_put_failure:
4070 nlmsg_cancel(skb, nlh);
4071 return -EMSGSIZE;
4072 }
4073
4074 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4075 {
4076 struct net *net = sock_net(skb->sk);
4077 int h, s_h;
4078 int idx = 0, s_idx;
4079 struct net_device *dev;
4080 struct inet6_dev *idev;
4081 struct hlist_head *head;
4082 struct hlist_node *node;
4083
4084 s_h = cb->args[0];
4085 s_idx = cb->args[1];
4086
4087 rcu_read_lock();
4088 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4089 idx = 0;
4090 head = &net->dev_index_head[h];
4091 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
4092 if (idx < s_idx)
4093 goto cont;
4094 idev = __in6_dev_get(dev);
4095 if (!idev)
4096 goto cont;
4097 if (inet6_fill_ifinfo(skb, idev,
4098 NETLINK_CB(cb->skb).pid,
4099 cb->nlh->nlmsg_seq,
4100 RTM_NEWLINK, NLM_F_MULTI) <= 0)
4101 goto out;
4102 cont:
4103 idx++;
4104 }
4105 }
4106 out:
4107 rcu_read_unlock();
4108 cb->args[1] = idx;
4109 cb->args[0] = h;
4110
4111 return skb->len;
4112 }
4113
4114 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4115 {
4116 struct sk_buff *skb;
4117 struct net *net = dev_net(idev->dev);
4118 int err = -ENOBUFS;
4119
4120 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
4121 if (skb == NULL)
4122 goto errout;
4123
4124 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
4125 if (err < 0) {
4126 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4127 WARN_ON(err == -EMSGSIZE);
4128 kfree_skb(skb);
4129 goto errout;
4130 }
4131 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
4132 return;
4133 errout:
4134 if (err < 0)
4135 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
4136 }
4137
4138 static inline size_t inet6_prefix_nlmsg_size(void)
4139 {
4140 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4141 + nla_total_size(sizeof(struct in6_addr))
4142 + nla_total_size(sizeof(struct prefix_cacheinfo));
4143 }
4144
4145 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
4146 struct prefix_info *pinfo, u32 pid, u32 seq,
4147 int event, unsigned int flags)
4148 {
4149 struct prefixmsg *pmsg;
4150 struct nlmsghdr *nlh;
4151 struct prefix_cacheinfo ci;
4152
4153 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
4154 if (nlh == NULL)
4155 return -EMSGSIZE;
4156
4157 pmsg = nlmsg_data(nlh);
4158 pmsg->prefix_family = AF_INET6;
4159 pmsg->prefix_pad1 = 0;
4160 pmsg->prefix_pad2 = 0;
4161 pmsg->prefix_ifindex = idev->dev->ifindex;
4162 pmsg->prefix_len = pinfo->prefix_len;
4163 pmsg->prefix_type = pinfo->type;
4164 pmsg->prefix_pad3 = 0;
4165 pmsg->prefix_flags = 0;
4166 if (pinfo->onlink)
4167 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4168 if (pinfo->autoconf)
4169 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4170
4171 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
4172 goto nla_put_failure;
4173 ci.preferred_time = ntohl(pinfo->prefered);
4174 ci.valid_time = ntohl(pinfo->valid);
4175 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
4176 goto nla_put_failure;
4177 return nlmsg_end(skb, nlh);
4178
4179 nla_put_failure:
4180 nlmsg_cancel(skb, nlh);
4181 return -EMSGSIZE;
4182 }
4183
4184 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
4185 struct prefix_info *pinfo)
4186 {
4187 struct sk_buff *skb;
4188 struct net *net = dev_net(idev->dev);
4189 int err = -ENOBUFS;
4190
4191 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
4192 if (skb == NULL)
4193 goto errout;
4194
4195 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
4196 if (err < 0) {
4197 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4198 WARN_ON(err == -EMSGSIZE);
4199 kfree_skb(skb);
4200 goto errout;
4201 }
4202 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4203 return;
4204 errout:
4205 if (err < 0)
4206 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
4207 }
4208
4209 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4210 {
4211 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4212
4213 switch (event) {
4214 case RTM_NEWADDR:
4215 /*
4216 * If the address was optimistic
4217 * we inserted the route at the start of
4218 * our DAD process, so we don't need
4219 * to do it again
4220 */
4221 if (!(ifp->rt->rt6i_node))
4222 ip6_ins_rt(ifp->rt);
4223 if (ifp->idev->cnf.forwarding)
4224 addrconf_join_anycast(ifp);
4225 break;
4226 case RTM_DELADDR:
4227 if (ifp->idev->cnf.forwarding)
4228 addrconf_leave_anycast(ifp);
4229 addrconf_leave_solict(ifp->idev, &ifp->addr);
4230 dst_hold(&ifp->rt->dst);
4231
4232 if (ip6_del_rt(ifp->rt))
4233 dst_free(&ifp->rt->dst);
4234 break;
4235 }
4236 }
4237
4238 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4239 {
4240 rcu_read_lock_bh();
4241 if (likely(ifp->idev->dead == 0))
4242 __ipv6_ifa_notify(event, ifp);
4243 rcu_read_unlock_bh();
4244 }
4245
4246 #ifdef CONFIG_SYSCTL
4247
4248 static
4249 int addrconf_sysctl_forward(ctl_table *ctl, int write,
4250 void __user *buffer, size_t *lenp, loff_t *ppos)
4251 {
4252 int *valp = ctl->data;
4253 int val = *valp;
4254 loff_t pos = *ppos;
4255 ctl_table lctl;
4256 int ret;
4257
4258 /*
4259 * ctl->data points to idev->cnf.forwarding, we should
4260 * not modify it until we get the rtnl lock.
4261 */
4262 lctl = *ctl;
4263 lctl.data = &val;
4264
4265 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4266
4267 if (write)
4268 ret = addrconf_fixup_forwarding(ctl, valp, val);
4269 if (ret)
4270 *ppos = pos;
4271 return ret;
4272 }
4273
4274 static void dev_disable_change(struct inet6_dev *idev)
4275 {
4276 if (!idev || !idev->dev)
4277 return;
4278
4279 if (idev->cnf.disable_ipv6)
4280 addrconf_notify(NULL, NETDEV_DOWN, idev->dev);
4281 else
4282 addrconf_notify(NULL, NETDEV_UP, idev->dev);
4283 }
4284
4285 static void addrconf_disable_change(struct net *net, __s32 newf)
4286 {
4287 struct net_device *dev;
4288 struct inet6_dev *idev;
4289
4290 rcu_read_lock();
4291 for_each_netdev_rcu(net, dev) {
4292 idev = __in6_dev_get(dev);
4293 if (idev) {
4294 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4295 idev->cnf.disable_ipv6 = newf;
4296 if (changed)
4297 dev_disable_change(idev);
4298 }
4299 }
4300 rcu_read_unlock();
4301 }
4302
4303 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
4304 {
4305 struct net *net;
4306 int old;
4307
4308 if (!rtnl_trylock())
4309 return restart_syscall();
4310
4311 net = (struct net *)table->extra2;
4312 old = *p;
4313 *p = newf;
4314
4315 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
4316 rtnl_unlock();
4317 return 0;
4318 }
4319
4320 if (p == &net->ipv6.devconf_all->disable_ipv6) {
4321 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4322 addrconf_disable_change(net, newf);
4323 } else if ((!newf) ^ (!old))
4324 dev_disable_change((struct inet6_dev *)table->extra1);
4325
4326 rtnl_unlock();
4327 return 0;
4328 }
4329
4330 static
4331 int addrconf_sysctl_disable(ctl_table *ctl, int write,
4332 void __user *buffer, size_t *lenp, loff_t *ppos)
4333 {
4334 int *valp = ctl->data;
4335 int val = *valp;
4336 loff_t pos = *ppos;
4337 ctl_table lctl;
4338 int ret;
4339
4340 /*
4341 * ctl->data points to idev->cnf.disable_ipv6, we should
4342 * not modify it until we get the rtnl lock.
4343 */
4344 lctl = *ctl;
4345 lctl.data = &val;
4346
4347 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4348
4349 if (write)
4350 ret = addrconf_disable_ipv6(ctl, valp, val);
4351 if (ret)
4352 *ppos = pos;
4353 return ret;
4354 }
4355
4356 static struct addrconf_sysctl_table
4357 {
4358 struct ctl_table_header *sysctl_header;
4359 ctl_table addrconf_vars[DEVCONF_MAX+1];
4360 } addrconf_sysctl __read_mostly = {
4361 .sysctl_header = NULL,
4362 .addrconf_vars = {
4363 {
4364 .procname = "forwarding",
4365 .data = &ipv6_devconf.forwarding,
4366 .maxlen = sizeof(int),
4367 .mode = 0644,
4368 .proc_handler = addrconf_sysctl_forward,
4369 },
4370 {
4371 .procname = "hop_limit",
4372 .data = &ipv6_devconf.hop_limit,
4373 .maxlen = sizeof(int),
4374 .mode = 0644,
4375 .proc_handler = proc_dointvec,
4376 },
4377 {
4378 .procname = "mtu",
4379 .data = &ipv6_devconf.mtu6,
4380 .maxlen = sizeof(int),
4381 .mode = 0644,
4382 .proc_handler = proc_dointvec,
4383 },
4384 {
4385 .procname = "accept_ra",
4386 .data = &ipv6_devconf.accept_ra,
4387 .maxlen = sizeof(int),
4388 .mode = 0644,
4389 .proc_handler = proc_dointvec,
4390 },
4391 {
4392 .procname = "accept_redirects",
4393 .data = &ipv6_devconf.accept_redirects,
4394 .maxlen = sizeof(int),
4395 .mode = 0644,
4396 .proc_handler = proc_dointvec,
4397 },
4398 {
4399 .procname = "autoconf",
4400 .data = &ipv6_devconf.autoconf,
4401 .maxlen = sizeof(int),
4402 .mode = 0644,
4403 .proc_handler = proc_dointvec,
4404 },
4405 {
4406 .procname = "dad_transmits",
4407 .data = &ipv6_devconf.dad_transmits,
4408 .maxlen = sizeof(int),
4409 .mode = 0644,
4410 .proc_handler = proc_dointvec,
4411 },
4412 {
4413 .procname = "router_solicitations",
4414 .data = &ipv6_devconf.rtr_solicits,
4415 .maxlen = sizeof(int),
4416 .mode = 0644,
4417 .proc_handler = proc_dointvec,
4418 },
4419 {
4420 .procname = "router_solicitation_interval",
4421 .data = &ipv6_devconf.rtr_solicit_interval,
4422 .maxlen = sizeof(int),
4423 .mode = 0644,
4424 .proc_handler = proc_dointvec_jiffies,
4425 },
4426 {
4427 .procname = "router_solicitation_delay",
4428 .data = &ipv6_devconf.rtr_solicit_delay,
4429 .maxlen = sizeof(int),
4430 .mode = 0644,
4431 .proc_handler = proc_dointvec_jiffies,
4432 },
4433 {
4434 .procname = "force_mld_version",
4435 .data = &ipv6_devconf.force_mld_version,
4436 .maxlen = sizeof(int),
4437 .mode = 0644,
4438 .proc_handler = proc_dointvec,
4439 },
4440 #ifdef CONFIG_IPV6_PRIVACY
4441 {
4442 .procname = "use_tempaddr",
4443 .data = &ipv6_devconf.use_tempaddr,
4444 .maxlen = sizeof(int),
4445 .mode = 0644,
4446 .proc_handler = proc_dointvec,
4447 },
4448 {
4449 .procname = "temp_valid_lft",
4450 .data = &ipv6_devconf.temp_valid_lft,
4451 .maxlen = sizeof(int),
4452 .mode = 0644,
4453 .proc_handler = proc_dointvec,
4454 },
4455 {
4456 .procname = "temp_prefered_lft",
4457 .data = &ipv6_devconf.temp_prefered_lft,
4458 .maxlen = sizeof(int),
4459 .mode = 0644,
4460 .proc_handler = proc_dointvec,
4461 },
4462 {
4463 .procname = "regen_max_retry",
4464 .data = &ipv6_devconf.regen_max_retry,
4465 .maxlen = sizeof(int),
4466 .mode = 0644,
4467 .proc_handler = proc_dointvec,
4468 },
4469 {
4470 .procname = "max_desync_factor",
4471 .data = &ipv6_devconf.max_desync_factor,
4472 .maxlen = sizeof(int),
4473 .mode = 0644,
4474 .proc_handler = proc_dointvec,
4475 },
4476 #endif
4477 {
4478 .procname = "max_addresses",
4479 .data = &ipv6_devconf.max_addresses,
4480 .maxlen = sizeof(int),
4481 .mode = 0644,
4482 .proc_handler = proc_dointvec,
4483 },
4484 {
4485 .procname = "accept_ra_defrtr",
4486 .data = &ipv6_devconf.accept_ra_defrtr,
4487 .maxlen = sizeof(int),
4488 .mode = 0644,
4489 .proc_handler = proc_dointvec,
4490 },
4491 {
4492 .procname = "accept_ra_pinfo",
4493 .data = &ipv6_devconf.accept_ra_pinfo,
4494 .maxlen = sizeof(int),
4495 .mode = 0644,
4496 .proc_handler = proc_dointvec,
4497 },
4498 #ifdef CONFIG_IPV6_ROUTER_PREF
4499 {
4500 .procname = "accept_ra_rtr_pref",
4501 .data = &ipv6_devconf.accept_ra_rtr_pref,
4502 .maxlen = sizeof(int),
4503 .mode = 0644,
4504 .proc_handler = proc_dointvec,
4505 },
4506 {
4507 .procname = "router_probe_interval",
4508 .data = &ipv6_devconf.rtr_probe_interval,
4509 .maxlen = sizeof(int),
4510 .mode = 0644,
4511 .proc_handler = proc_dointvec_jiffies,
4512 },
4513 #ifdef CONFIG_IPV6_ROUTE_INFO
4514 {
4515 .procname = "accept_ra_rt_info_max_plen",
4516 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4517 .maxlen = sizeof(int),
4518 .mode = 0644,
4519 .proc_handler = proc_dointvec,
4520 },
4521 #endif
4522 #endif
4523 {
4524 .procname = "proxy_ndp",
4525 .data = &ipv6_devconf.proxy_ndp,
4526 .maxlen = sizeof(int),
4527 .mode = 0644,
4528 .proc_handler = proc_dointvec,
4529 },
4530 {
4531 .procname = "accept_source_route",
4532 .data = &ipv6_devconf.accept_source_route,
4533 .maxlen = sizeof(int),
4534 .mode = 0644,
4535 .proc_handler = proc_dointvec,
4536 },
4537 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4538 {
4539 .procname = "optimistic_dad",
4540 .data = &ipv6_devconf.optimistic_dad,
4541 .maxlen = sizeof(int),
4542 .mode = 0644,
4543 .proc_handler = proc_dointvec,
4544
4545 },
4546 #endif
4547 #ifdef CONFIG_IPV6_MROUTE
4548 {
4549 .procname = "mc_forwarding",
4550 .data = &ipv6_devconf.mc_forwarding,
4551 .maxlen = sizeof(int),
4552 .mode = 0444,
4553 .proc_handler = proc_dointvec,
4554 },
4555 #endif
4556 {
4557 .procname = "disable_ipv6",
4558 .data = &ipv6_devconf.disable_ipv6,
4559 .maxlen = sizeof(int),
4560 .mode = 0644,
4561 .proc_handler = addrconf_sysctl_disable,
4562 },
4563 {
4564 .procname = "accept_dad",
4565 .data = &ipv6_devconf.accept_dad,
4566 .maxlen = sizeof(int),
4567 .mode = 0644,
4568 .proc_handler = proc_dointvec,
4569 },
4570 {
4571 .procname = "force_tllao",
4572 .data = &ipv6_devconf.force_tllao,
4573 .maxlen = sizeof(int),
4574 .mode = 0644,
4575 .proc_handler = proc_dointvec
4576 },
4577 {
4578 /* sentinel */
4579 }
4580 },
4581 };
4582
4583 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4584 struct inet6_dev *idev, struct ipv6_devconf *p)
4585 {
4586 int i;
4587 struct addrconf_sysctl_table *t;
4588 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
4589
4590 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4591 if (t == NULL)
4592 goto out;
4593
4594 for (i = 0; t->addrconf_vars[i].data; i++) {
4595 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
4596 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4597 t->addrconf_vars[i].extra2 = net;
4598 }
4599
4600 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
4601
4602 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
4603 if (t->sysctl_header == NULL)
4604 goto free;
4605
4606 p->sysctl = t;
4607 return 0;
4608
4609 free:
4610 kfree(t);
4611 out:
4612 return -ENOBUFS;
4613 }
4614
4615 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4616 {
4617 struct addrconf_sysctl_table *t;
4618
4619 if (p->sysctl == NULL)
4620 return;
4621
4622 t = p->sysctl;
4623 p->sysctl = NULL;
4624 unregister_net_sysctl_table(t->sysctl_header);
4625 kfree(t);
4626 }
4627
4628 static void addrconf_sysctl_register(struct inet6_dev *idev)
4629 {
4630 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
4631 &ndisc_ifinfo_sysctl_change);
4632 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
4633 idev, &idev->cnf);
4634 }
4635
4636 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
4637 {
4638 __addrconf_sysctl_unregister(&idev->cnf);
4639 neigh_sysctl_unregister(idev->nd_parms);
4640 }
4641
4642
4643 #endif
4644
4645 static int __net_init addrconf_init_net(struct net *net)
4646 {
4647 int err;
4648 struct ipv6_devconf *all, *dflt;
4649
4650 err = -ENOMEM;
4651 all = &ipv6_devconf;
4652 dflt = &ipv6_devconf_dflt;
4653
4654 if (!net_eq(net, &init_net)) {
4655 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4656 if (all == NULL)
4657 goto err_alloc_all;
4658
4659 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4660 if (dflt == NULL)
4661 goto err_alloc_dflt;
4662 } else {
4663 /* these will be inherited by all namespaces */
4664 dflt->autoconf = ipv6_defaults.autoconf;
4665 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
4666 }
4667
4668 net->ipv6.devconf_all = all;
4669 net->ipv6.devconf_dflt = dflt;
4670
4671 #ifdef CONFIG_SYSCTL
4672 err = __addrconf_sysctl_register(net, "all", NULL, all);
4673 if (err < 0)
4674 goto err_reg_all;
4675
4676 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
4677 if (err < 0)
4678 goto err_reg_dflt;
4679 #endif
4680 return 0;
4681
4682 #ifdef CONFIG_SYSCTL
4683 err_reg_dflt:
4684 __addrconf_sysctl_unregister(all);
4685 err_reg_all:
4686 kfree(dflt);
4687 #endif
4688 err_alloc_dflt:
4689 kfree(all);
4690 err_alloc_all:
4691 return err;
4692 }
4693
4694 static void __net_exit addrconf_exit_net(struct net *net)
4695 {
4696 #ifdef CONFIG_SYSCTL
4697 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4698 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4699 #endif
4700 if (!net_eq(net, &init_net)) {
4701 kfree(net->ipv6.devconf_dflt);
4702 kfree(net->ipv6.devconf_all);
4703 }
4704 }
4705
4706 static struct pernet_operations addrconf_ops = {
4707 .init = addrconf_init_net,
4708 .exit = addrconf_exit_net,
4709 };
4710
4711 /*
4712 * Device notifier
4713 */
4714
4715 int register_inet6addr_notifier(struct notifier_block *nb)
4716 {
4717 return atomic_notifier_chain_register(&inet6addr_chain, nb);
4718 }
4719 EXPORT_SYMBOL(register_inet6addr_notifier);
4720
4721 int unregister_inet6addr_notifier(struct notifier_block *nb)
4722 {
4723 return atomic_notifier_chain_unregister(&inet6addr_chain, nb);
4724 }
4725 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4726
4727 static struct rtnl_af_ops inet6_ops = {
4728 .family = AF_INET6,
4729 .fill_link_af = inet6_fill_link_af,
4730 .get_link_af_size = inet6_get_link_af_size,
4731 };
4732
4733 /*
4734 * Init / cleanup code
4735 */
4736
4737 int __init addrconf_init(void)
4738 {
4739 int i, err;
4740
4741 err = ipv6_addr_label_init();
4742 if (err < 0) {
4743 pr_crit("%s: cannot initialize default policy table: %d\n",
4744 __func__, err);
4745 goto out;
4746 }
4747
4748 err = register_pernet_subsys(&addrconf_ops);
4749 if (err < 0)
4750 goto out_addrlabel;
4751
4752 /* The addrconf netdev notifier requires that loopback_dev
4753 * has it's ipv6 private information allocated and setup
4754 * before it can bring up and give link-local addresses
4755 * to other devices which are up.
4756 *
4757 * Unfortunately, loopback_dev is not necessarily the first
4758 * entry in the global dev_base list of net devices. In fact,
4759 * it is likely to be the very last entry on that list.
4760 * So this causes the notifier registry below to try and
4761 * give link-local addresses to all devices besides loopback_dev
4762 * first, then loopback_dev, which cases all the non-loopback_dev
4763 * devices to fail to get a link-local address.
4764 *
4765 * So, as a temporary fix, allocate the ipv6 structure for
4766 * loopback_dev first by hand.
4767 * Longer term, all of the dependencies ipv6 has upon the loopback
4768 * device and it being up should be removed.
4769 */
4770 rtnl_lock();
4771 if (!ipv6_add_dev(init_net.loopback_dev))
4772 err = -ENOMEM;
4773 rtnl_unlock();
4774 if (err)
4775 goto errlo;
4776
4777 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4778 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
4779
4780 register_netdevice_notifier(&ipv6_dev_notf);
4781
4782 addrconf_verify(0);
4783
4784 err = rtnl_af_register(&inet6_ops);
4785 if (err < 0)
4786 goto errout_af;
4787
4788 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
4789 NULL);
4790 if (err < 0)
4791 goto errout;
4792
4793 /* Only the first call to __rtnl_register can fail */
4794 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
4795 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
4796 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
4797 inet6_dump_ifaddr, NULL);
4798 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
4799 inet6_dump_ifmcaddr, NULL);
4800 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
4801 inet6_dump_ifacaddr, NULL);
4802
4803 ipv6_addr_label_rtnl_register();
4804
4805 return 0;
4806 errout:
4807 rtnl_af_unregister(&inet6_ops);
4808 errout_af:
4809 unregister_netdevice_notifier(&ipv6_dev_notf);
4810 errlo:
4811 unregister_pernet_subsys(&addrconf_ops);
4812 out_addrlabel:
4813 ipv6_addr_label_cleanup();
4814 out:
4815 return err;
4816 }
4817
4818 void addrconf_cleanup(void)
4819 {
4820 struct net_device *dev;
4821 int i;
4822
4823 unregister_netdevice_notifier(&ipv6_dev_notf);
4824 unregister_pernet_subsys(&addrconf_ops);
4825 ipv6_addr_label_cleanup();
4826
4827 rtnl_lock();
4828
4829 __rtnl_af_unregister(&inet6_ops);
4830
4831 /* clean dev list */
4832 for_each_netdev(&init_net, dev) {
4833 if (__in6_dev_get(dev) == NULL)
4834 continue;
4835 addrconf_ifdown(dev, 1);
4836 }
4837 addrconf_ifdown(init_net.loopback_dev, 2);
4838
4839 /*
4840 * Check hash table.
4841 */
4842 spin_lock_bh(&addrconf_hash_lock);
4843 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4844 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
4845 spin_unlock_bh(&addrconf_hash_lock);
4846
4847 del_timer(&addr_chk_timer);
4848 rtnl_unlock();
4849 }
Linux kernel - Deliverables
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