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net: remove delay at device dismantle
[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;
2570 int run_pending = 0;
2571 int err;
2572
2573 if (event == NETDEV_UNREGISTER_FINAL)
2574 return NOTIFY_DONE;
2575
2576 idev = __in6_dev_get(dev);
2577 switch (event) {
2578 case NETDEV_REGISTER:
2579 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2580 idev = ipv6_add_dev(dev);
2581 if (!idev)
2582 return notifier_from_errno(-ENOMEM);
2583 }
2584 break;
2585
2586 case NETDEV_UP:
2587 case NETDEV_CHANGE:
2588 if (dev->flags & IFF_SLAVE)
2589 break;
2590
2591 if (event == NETDEV_UP) {
2592 if (!addrconf_qdisc_ok(dev)) {
2593 /* device is not ready yet. */
2594 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
2595 dev->name);
2596 break;
2597 }
2598
2599 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2600 idev = ipv6_add_dev(dev);
2601
2602 if (idev) {
2603 idev->if_flags |= IF_READY;
2604 run_pending = 1;
2605 }
2606 } else {
2607 if (!addrconf_qdisc_ok(dev)) {
2608 /* device is still not ready. */
2609 break;
2610 }
2611
2612 if (idev) {
2613 if (idev->if_flags & IF_READY)
2614 /* device is already configured. */
2615 break;
2616 idev->if_flags |= IF_READY;
2617 }
2618
2619 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
2620 dev->name);
2621
2622 run_pending = 1;
2623 }
2624
2625 switch (dev->type) {
2626 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2627 case ARPHRD_SIT:
2628 addrconf_sit_config(dev);
2629 break;
2630 #endif
2631 #if defined(CONFIG_NET_IPGRE) || defined(CONFIG_NET_IPGRE_MODULE)
2632 case ARPHRD_IPGRE:
2633 addrconf_gre_config(dev);
2634 break;
2635 #endif
2636 case ARPHRD_TUNNEL6:
2637 addrconf_ip6_tnl_config(dev);
2638 break;
2639 case ARPHRD_LOOPBACK:
2640 init_loopback(dev);
2641 break;
2642
2643 default:
2644 addrconf_dev_config(dev);
2645 break;
2646 }
2647
2648 if (idev) {
2649 if (run_pending)
2650 addrconf_dad_run(idev);
2651
2652 /*
2653 * If the MTU changed during the interface down,
2654 * when the interface up, the changed MTU must be
2655 * reflected in the idev as well as routers.
2656 */
2657 if (idev->cnf.mtu6 != dev->mtu &&
2658 dev->mtu >= IPV6_MIN_MTU) {
2659 rt6_mtu_change(dev, dev->mtu);
2660 idev->cnf.mtu6 = dev->mtu;
2661 }
2662 idev->tstamp = jiffies;
2663 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2664
2665 /*
2666 * If the changed mtu during down is lower than
2667 * IPV6_MIN_MTU stop IPv6 on this interface.
2668 */
2669 if (dev->mtu < IPV6_MIN_MTU)
2670 addrconf_ifdown(dev, 1);
2671 }
2672 break;
2673
2674 case NETDEV_CHANGEMTU:
2675 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2676 rt6_mtu_change(dev, dev->mtu);
2677 idev->cnf.mtu6 = dev->mtu;
2678 break;
2679 }
2680
2681 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2682 idev = ipv6_add_dev(dev);
2683 if (idev)
2684 break;
2685 }
2686
2687 /*
2688 * MTU falled under IPV6_MIN_MTU.
2689 * Stop IPv6 on this interface.
2690 */
2691
2692 case NETDEV_DOWN:
2693 case NETDEV_UNREGISTER:
2694 /*
2695 * Remove all addresses from this interface.
2696 */
2697 addrconf_ifdown(dev, event != NETDEV_DOWN);
2698 break;
2699
2700 case NETDEV_CHANGENAME:
2701 if (idev) {
2702 snmp6_unregister_dev(idev);
2703 addrconf_sysctl_unregister(idev);
2704 addrconf_sysctl_register(idev);
2705 err = snmp6_register_dev(idev);
2706 if (err)
2707 return notifier_from_errno(err);
2708 }
2709 break;
2710
2711 case NETDEV_PRE_TYPE_CHANGE:
2712 case NETDEV_POST_TYPE_CHANGE:
2713 addrconf_type_change(dev, event);
2714 break;
2715 }
2716
2717 return NOTIFY_OK;
2718 }
2719
2720 /*
2721 * addrconf module should be notified of a device going up
2722 */
2723 static struct notifier_block ipv6_dev_notf = {
2724 .notifier_call = addrconf_notify,
2725 };
2726
2727 static void addrconf_type_change(struct net_device *dev, unsigned long event)
2728 {
2729 struct inet6_dev *idev;
2730 ASSERT_RTNL();
2731
2732 idev = __in6_dev_get(dev);
2733
2734 if (event == NETDEV_POST_TYPE_CHANGE)
2735 ipv6_mc_remap(idev);
2736 else if (event == NETDEV_PRE_TYPE_CHANGE)
2737 ipv6_mc_unmap(idev);
2738 }
2739
2740 static int addrconf_ifdown(struct net_device *dev, int how)
2741 {
2742 struct net *net = dev_net(dev);
2743 struct inet6_dev *idev;
2744 struct inet6_ifaddr *ifa;
2745 int state, i;
2746
2747 ASSERT_RTNL();
2748
2749 rt6_ifdown(net, dev);
2750 neigh_ifdown(&nd_tbl, dev);
2751
2752 idev = __in6_dev_get(dev);
2753 if (idev == NULL)
2754 return -ENODEV;
2755
2756 /*
2757 * Step 1: remove reference to ipv6 device from parent device.
2758 * Do not dev_put!
2759 */
2760 if (how) {
2761 idev->dead = 1;
2762
2763 /* protected by rtnl_lock */
2764 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
2765
2766 /* Step 1.5: remove snmp6 entry */
2767 snmp6_unregister_dev(idev);
2768
2769 }
2770
2771 /* Step 2: clear hash table */
2772 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
2773 struct hlist_head *h = &inet6_addr_lst[i];
2774 struct hlist_node *n;
2775
2776 spin_lock_bh(&addrconf_hash_lock);
2777 restart:
2778 hlist_for_each_entry_rcu(ifa, n, h, addr_lst) {
2779 if (ifa->idev == idev) {
2780 hlist_del_init_rcu(&ifa->addr_lst);
2781 addrconf_del_timer(ifa);
2782 goto restart;
2783 }
2784 }
2785 spin_unlock_bh(&addrconf_hash_lock);
2786 }
2787
2788 write_lock_bh(&idev->lock);
2789
2790 /* Step 2: clear flags for stateless addrconf */
2791 if (!how)
2792 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2793
2794 #ifdef CONFIG_IPV6_PRIVACY
2795 if (how && del_timer(&idev->regen_timer))
2796 in6_dev_put(idev);
2797
2798 /* Step 3: clear tempaddr list */
2799 while (!list_empty(&idev->tempaddr_list)) {
2800 ifa = list_first_entry(&idev->tempaddr_list,
2801 struct inet6_ifaddr, tmp_list);
2802 list_del(&ifa->tmp_list);
2803 write_unlock_bh(&idev->lock);
2804 spin_lock_bh(&ifa->lock);
2805
2806 if (ifa->ifpub) {
2807 in6_ifa_put(ifa->ifpub);
2808 ifa->ifpub = NULL;
2809 }
2810 spin_unlock_bh(&ifa->lock);
2811 in6_ifa_put(ifa);
2812 write_lock_bh(&idev->lock);
2813 }
2814 #endif
2815
2816 while (!list_empty(&idev->addr_list)) {
2817 ifa = list_first_entry(&idev->addr_list,
2818 struct inet6_ifaddr, if_list);
2819 addrconf_del_timer(ifa);
2820
2821 list_del(&ifa->if_list);
2822
2823 write_unlock_bh(&idev->lock);
2824
2825 spin_lock_bh(&ifa->state_lock);
2826 state = ifa->state;
2827 ifa->state = INET6_IFADDR_STATE_DEAD;
2828 spin_unlock_bh(&ifa->state_lock);
2829
2830 if (state != INET6_IFADDR_STATE_DEAD) {
2831 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2832 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2833 }
2834 in6_ifa_put(ifa);
2835
2836 write_lock_bh(&idev->lock);
2837 }
2838
2839 write_unlock_bh(&idev->lock);
2840
2841 /* Step 5: Discard multicast list */
2842 if (how)
2843 ipv6_mc_destroy_dev(idev);
2844 else
2845 ipv6_mc_down(idev);
2846
2847 idev->tstamp = jiffies;
2848
2849 /* Last: Shot the device (if unregistered) */
2850 if (how) {
2851 addrconf_sysctl_unregister(idev);
2852 neigh_parms_release(&nd_tbl, idev->nd_parms);
2853 neigh_ifdown(&nd_tbl, dev);
2854 in6_dev_put(idev);
2855 }
2856 return 0;
2857 }
2858
2859 static void addrconf_rs_timer(unsigned long data)
2860 {
2861 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2862 struct inet6_dev *idev = ifp->idev;
2863
2864 read_lock(&idev->lock);
2865 if (idev->dead || !(idev->if_flags & IF_READY))
2866 goto out;
2867
2868 if (idev->cnf.forwarding)
2869 goto out;
2870
2871 /* Announcement received after solicitation was sent */
2872 if (idev->if_flags & IF_RA_RCVD)
2873 goto out;
2874
2875 spin_lock(&ifp->lock);
2876 if (ifp->probes++ < idev->cnf.rtr_solicits) {
2877 /* The wait after the last probe can be shorter */
2878 addrconf_mod_timer(ifp, AC_RS,
2879 (ifp->probes == idev->cnf.rtr_solicits) ?
2880 idev->cnf.rtr_solicit_delay :
2881 idev->cnf.rtr_solicit_interval);
2882 spin_unlock(&ifp->lock);
2883
2884 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2885 } else {
2886 spin_unlock(&ifp->lock);
2887 /*
2888 * Note: we do not support deprecated "all on-link"
2889 * assumption any longer.
2890 */
2891 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
2892 }
2893
2894 out:
2895 read_unlock(&idev->lock);
2896 in6_ifa_put(ifp);
2897 }
2898
2899 /*
2900 * Duplicate Address Detection
2901 */
2902 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2903 {
2904 unsigned long rand_num;
2905 struct inet6_dev *idev = ifp->idev;
2906
2907 if (ifp->flags & IFA_F_OPTIMISTIC)
2908 rand_num = 0;
2909 else
2910 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2911
2912 ifp->probes = idev->cnf.dad_transmits;
2913 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2914 }
2915
2916 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
2917 {
2918 struct inet6_dev *idev = ifp->idev;
2919 struct net_device *dev = idev->dev;
2920
2921 addrconf_join_solict(dev, &ifp->addr);
2922
2923 net_srandom(ifp->addr.s6_addr32[3]);
2924
2925 read_lock_bh(&idev->lock);
2926 spin_lock(&ifp->lock);
2927 if (ifp->state == INET6_IFADDR_STATE_DEAD)
2928 goto out;
2929
2930 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2931 idev->cnf.accept_dad < 1 ||
2932 !(ifp->flags&IFA_F_TENTATIVE) ||
2933 ifp->flags & IFA_F_NODAD) {
2934 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
2935 spin_unlock(&ifp->lock);
2936 read_unlock_bh(&idev->lock);
2937
2938 addrconf_dad_completed(ifp);
2939 return;
2940 }
2941
2942 if (!(idev->if_flags & IF_READY)) {
2943 spin_unlock(&ifp->lock);
2944 read_unlock_bh(&idev->lock);
2945 /*
2946 * If the device is not ready:
2947 * - keep it tentative if it is a permanent address.
2948 * - otherwise, kill it.
2949 */
2950 in6_ifa_hold(ifp);
2951 addrconf_dad_stop(ifp, 0);
2952 return;
2953 }
2954
2955 /*
2956 * Optimistic nodes can start receiving
2957 * Frames right away
2958 */
2959 if (ifp->flags & IFA_F_OPTIMISTIC)
2960 ip6_ins_rt(ifp->rt);
2961
2962 addrconf_dad_kick(ifp);
2963 out:
2964 spin_unlock(&ifp->lock);
2965 read_unlock_bh(&idev->lock);
2966 }
2967
2968 static void addrconf_dad_timer(unsigned long data)
2969 {
2970 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2971 struct inet6_dev *idev = ifp->idev;
2972 struct in6_addr mcaddr;
2973
2974 if (!ifp->probes && addrconf_dad_end(ifp))
2975 goto out;
2976
2977 read_lock(&idev->lock);
2978 if (idev->dead || !(idev->if_flags & IF_READY)) {
2979 read_unlock(&idev->lock);
2980 goto out;
2981 }
2982
2983 spin_lock(&ifp->lock);
2984 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
2985 spin_unlock(&ifp->lock);
2986 read_unlock(&idev->lock);
2987 goto out;
2988 }
2989
2990 if (ifp->probes == 0) {
2991 /*
2992 * DAD was successful
2993 */
2994
2995 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
2996 spin_unlock(&ifp->lock);
2997 read_unlock(&idev->lock);
2998
2999 addrconf_dad_completed(ifp);
3000
3001 goto out;
3002 }
3003
3004 ifp->probes--;
3005 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
3006 spin_unlock(&ifp->lock);
3007 read_unlock(&idev->lock);
3008
3009 /* send a neighbour solicitation for our addr */
3010 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3011 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
3012 out:
3013 in6_ifa_put(ifp);
3014 }
3015
3016 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3017 {
3018 struct net_device *dev = ifp->idev->dev;
3019
3020 /*
3021 * Configure the address for reception. Now it is valid.
3022 */
3023
3024 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3025
3026 /* If added prefix is link local and we are prepared to process
3027 router advertisements, start sending router solicitations.
3028 */
3029
3030 if (((ifp->idev->cnf.accept_ra == 1 && !ifp->idev->cnf.forwarding) ||
3031 ifp->idev->cnf.accept_ra == 2) &&
3032 ifp->idev->cnf.rtr_solicits > 0 &&
3033 (dev->flags&IFF_LOOPBACK) == 0 &&
3034 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
3035 /*
3036 * If a host as already performed a random delay
3037 * [...] as part of DAD [...] there is no need
3038 * to delay again before sending the first RS
3039 */
3040 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
3041
3042 spin_lock_bh(&ifp->lock);
3043 ifp->probes = 1;
3044 ifp->idev->if_flags |= IF_RS_SENT;
3045 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
3046 spin_unlock_bh(&ifp->lock);
3047 }
3048 }
3049
3050 static void addrconf_dad_run(struct inet6_dev *idev)
3051 {
3052 struct inet6_ifaddr *ifp;
3053
3054 read_lock_bh(&idev->lock);
3055 list_for_each_entry(ifp, &idev->addr_list, if_list) {
3056 spin_lock(&ifp->lock);
3057 if (ifp->flags & IFA_F_TENTATIVE &&
3058 ifp->state == INET6_IFADDR_STATE_DAD)
3059 addrconf_dad_kick(ifp);
3060 spin_unlock(&ifp->lock);
3061 }
3062 read_unlock_bh(&idev->lock);
3063 }
3064
3065 #ifdef CONFIG_PROC_FS
3066 struct if6_iter_state {
3067 struct seq_net_private p;
3068 int bucket;
3069 int offset;
3070 };
3071
3072 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
3073 {
3074 struct inet6_ifaddr *ifa = NULL;
3075 struct if6_iter_state *state = seq->private;
3076 struct net *net = seq_file_net(seq);
3077 int p = 0;
3078
3079 /* initial bucket if pos is 0 */
3080 if (pos == 0) {
3081 state->bucket = 0;
3082 state->offset = 0;
3083 }
3084
3085 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3086 struct hlist_node *n;
3087 hlist_for_each_entry_rcu_bh(ifa, n, &inet6_addr_lst[state->bucket],
3088 addr_lst) {
3089 /* sync with offset */
3090 if (p < state->offset) {
3091 p++;
3092 continue;
3093 }
3094 state->offset++;
3095 if (net_eq(dev_net(ifa->idev->dev), net))
3096 return ifa;
3097 }
3098
3099 /* prepare for next bucket */
3100 state->offset = 0;
3101 p = 0;
3102 }
3103 return NULL;
3104 }
3105
3106 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3107 struct inet6_ifaddr *ifa)
3108 {
3109 struct if6_iter_state *state = seq->private;
3110 struct net *net = seq_file_net(seq);
3111 struct hlist_node *n = &ifa->addr_lst;
3112
3113 hlist_for_each_entry_continue_rcu_bh(ifa, n, addr_lst) {
3114 state->offset++;
3115 if (net_eq(dev_net(ifa->idev->dev), net))
3116 return ifa;
3117 }
3118
3119 while (++state->bucket < IN6_ADDR_HSIZE) {
3120 state->offset = 0;
3121 hlist_for_each_entry_rcu_bh(ifa, n,
3122 &inet6_addr_lst[state->bucket], addr_lst) {
3123 state->offset++;
3124 if (net_eq(dev_net(ifa->idev->dev), net))
3125 return ifa;
3126 }
3127 }
3128
3129 return NULL;
3130 }
3131
3132 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3133 __acquires(rcu_bh)
3134 {
3135 rcu_read_lock_bh();
3136 return if6_get_first(seq, *pos);
3137 }
3138
3139 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3140 {
3141 struct inet6_ifaddr *ifa;
3142
3143 ifa = if6_get_next(seq, v);
3144 ++*pos;
3145 return ifa;
3146 }
3147
3148 static void if6_seq_stop(struct seq_file *seq, void *v)
3149 __releases(rcu_bh)
3150 {
3151 rcu_read_unlock_bh();
3152 }
3153
3154 static int if6_seq_show(struct seq_file *seq, void *v)
3155 {
3156 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3157 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3158 &ifp->addr,
3159 ifp->idev->dev->ifindex,
3160 ifp->prefix_len,
3161 ifp->scope,
3162 ifp->flags,
3163 ifp->idev->dev->name);
3164 return 0;
3165 }
3166
3167 static const struct seq_operations if6_seq_ops = {
3168 .start = if6_seq_start,
3169 .next = if6_seq_next,
3170 .show = if6_seq_show,
3171 .stop = if6_seq_stop,
3172 };
3173
3174 static int if6_seq_open(struct inode *inode, struct file *file)
3175 {
3176 return seq_open_net(inode, file, &if6_seq_ops,
3177 sizeof(struct if6_iter_state));
3178 }
3179
3180 static const struct file_operations if6_fops = {
3181 .owner = THIS_MODULE,
3182 .open = if6_seq_open,
3183 .read = seq_read,
3184 .llseek = seq_lseek,
3185 .release = seq_release_net,
3186 };
3187
3188 static int __net_init if6_proc_net_init(struct net *net)
3189 {
3190 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
3191 return -ENOMEM;
3192 return 0;
3193 }
3194
3195 static void __net_exit if6_proc_net_exit(struct net *net)
3196 {
3197 proc_net_remove(net, "if_inet6");
3198 }
3199
3200 static struct pernet_operations if6_proc_net_ops = {
3201 .init = if6_proc_net_init,
3202 .exit = if6_proc_net_exit,
3203 };
3204
3205 int __init if6_proc_init(void)
3206 {
3207 return register_pernet_subsys(&if6_proc_net_ops);
3208 }
3209
3210 void if6_proc_exit(void)
3211 {
3212 unregister_pernet_subsys(&if6_proc_net_ops);
3213 }
3214 #endif /* CONFIG_PROC_FS */
3215
3216 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3217 /* Check if address is a home address configured on any interface. */
3218 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3219 {
3220 int ret = 0;
3221 struct inet6_ifaddr *ifp = NULL;
3222 struct hlist_node *n;
3223 unsigned int hash = inet6_addr_hash(addr);
3224
3225 rcu_read_lock_bh();
3226 hlist_for_each_entry_rcu_bh(ifp, n, &inet6_addr_lst[hash], addr_lst) {
3227 if (!net_eq(dev_net(ifp->idev->dev), net))
3228 continue;
3229 if (ipv6_addr_equal(&ifp->addr, addr) &&
3230 (ifp->flags & IFA_F_HOMEADDRESS)) {
3231 ret = 1;
3232 break;
3233 }
3234 }
3235 rcu_read_unlock_bh();
3236 return ret;
3237 }
3238 #endif
3239
3240 /*
3241 * Periodic address status verification
3242 */
3243
3244 static void addrconf_verify(unsigned long foo)
3245 {
3246 unsigned long now, next, next_sec, next_sched;
3247 struct inet6_ifaddr *ifp;
3248 struct hlist_node *node;
3249 int i;
3250
3251 rcu_read_lock_bh();
3252 spin_lock(&addrconf_verify_lock);
3253 now = jiffies;
3254 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3255
3256 del_timer(&addr_chk_timer);
3257
3258 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3259 restart:
3260 hlist_for_each_entry_rcu_bh(ifp, node,
3261 &inet6_addr_lst[i], addr_lst) {
3262 unsigned long age;
3263
3264 if (ifp->flags & IFA_F_PERMANENT)
3265 continue;
3266
3267 spin_lock(&ifp->lock);
3268 /* We try to batch several events at once. */
3269 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3270
3271 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3272 age >= ifp->valid_lft) {
3273 spin_unlock(&ifp->lock);
3274 in6_ifa_hold(ifp);
3275 ipv6_del_addr(ifp);
3276 goto restart;
3277 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3278 spin_unlock(&ifp->lock);
3279 continue;
3280 } else if (age >= ifp->prefered_lft) {
3281 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3282 int deprecate = 0;
3283
3284 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3285 deprecate = 1;
3286 ifp->flags |= IFA_F_DEPRECATED;
3287 }
3288
3289 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3290 next = ifp->tstamp + ifp->valid_lft * HZ;
3291
3292 spin_unlock(&ifp->lock);
3293
3294 if (deprecate) {
3295 in6_ifa_hold(ifp);
3296
3297 ipv6_ifa_notify(0, ifp);
3298 in6_ifa_put(ifp);
3299 goto restart;
3300 }
3301 #ifdef CONFIG_IPV6_PRIVACY
3302 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3303 !(ifp->flags&IFA_F_TENTATIVE)) {
3304 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3305 ifp->idev->cnf.dad_transmits *
3306 ifp->idev->nd_parms->retrans_time / HZ;
3307
3308 if (age >= ifp->prefered_lft - regen_advance) {
3309 struct inet6_ifaddr *ifpub = ifp->ifpub;
3310 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3311 next = ifp->tstamp + ifp->prefered_lft * HZ;
3312 if (!ifp->regen_count && ifpub) {
3313 ifp->regen_count++;
3314 in6_ifa_hold(ifp);
3315 in6_ifa_hold(ifpub);
3316 spin_unlock(&ifp->lock);
3317
3318 spin_lock(&ifpub->lock);
3319 ifpub->regen_count = 0;
3320 spin_unlock(&ifpub->lock);
3321 ipv6_create_tempaddr(ifpub, ifp);
3322 in6_ifa_put(ifpub);
3323 in6_ifa_put(ifp);
3324 goto restart;
3325 }
3326 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3327 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3328 spin_unlock(&ifp->lock);
3329 #endif
3330 } else {
3331 /* ifp->prefered_lft <= ifp->valid_lft */
3332 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3333 next = ifp->tstamp + ifp->prefered_lft * HZ;
3334 spin_unlock(&ifp->lock);
3335 }
3336 }
3337 }
3338
3339 next_sec = round_jiffies_up(next);
3340 next_sched = next;
3341
3342 /* If rounded timeout is accurate enough, accept it. */
3343 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3344 next_sched = next_sec;
3345
3346 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3347 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3348 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3349
3350 ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3351 now, next, next_sec, next_sched));
3352
3353 addr_chk_timer.expires = next_sched;
3354 add_timer(&addr_chk_timer);
3355 spin_unlock(&addrconf_verify_lock);
3356 rcu_read_unlock_bh();
3357 }
3358
3359 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3360 {
3361 struct in6_addr *pfx = NULL;
3362
3363 if (addr)
3364 pfx = nla_data(addr);
3365
3366 if (local) {
3367 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3368 pfx = NULL;
3369 else
3370 pfx = nla_data(local);
3371 }
3372
3373 return pfx;
3374 }
3375
3376 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3377 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3378 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3379 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3380 };
3381
3382 static int
3383 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3384 {
3385 struct net *net = sock_net(skb->sk);
3386 struct ifaddrmsg *ifm;
3387 struct nlattr *tb[IFA_MAX+1];
3388 struct in6_addr *pfx;
3389 int err;
3390
3391 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3392 if (err < 0)
3393 return err;
3394
3395 ifm = nlmsg_data(nlh);
3396 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3397 if (pfx == NULL)
3398 return -EINVAL;
3399
3400 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3401 }
3402
3403 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3404 u32 prefered_lft, u32 valid_lft)
3405 {
3406 u32 flags;
3407 clock_t expires;
3408 unsigned long timeout;
3409
3410 if (!valid_lft || (prefered_lft > valid_lft))
3411 return -EINVAL;
3412
3413 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3414 if (addrconf_finite_timeout(timeout)) {
3415 expires = jiffies_to_clock_t(timeout * HZ);
3416 valid_lft = timeout;
3417 flags = RTF_EXPIRES;
3418 } else {
3419 expires = 0;
3420 flags = 0;
3421 ifa_flags |= IFA_F_PERMANENT;
3422 }
3423
3424 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3425 if (addrconf_finite_timeout(timeout)) {
3426 if (timeout == 0)
3427 ifa_flags |= IFA_F_DEPRECATED;
3428 prefered_lft = timeout;
3429 }
3430
3431 spin_lock_bh(&ifp->lock);
3432 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3433 ifp->tstamp = jiffies;
3434 ifp->valid_lft = valid_lft;
3435 ifp->prefered_lft = prefered_lft;
3436
3437 spin_unlock_bh(&ifp->lock);
3438 if (!(ifp->flags&IFA_F_TENTATIVE))
3439 ipv6_ifa_notify(0, ifp);
3440
3441 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3442 expires, flags);
3443 addrconf_verify(0);
3444
3445 return 0;
3446 }
3447
3448 static int
3449 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3450 {
3451 struct net *net = sock_net(skb->sk);
3452 struct ifaddrmsg *ifm;
3453 struct nlattr *tb[IFA_MAX+1];
3454 struct in6_addr *pfx;
3455 struct inet6_ifaddr *ifa;
3456 struct net_device *dev;
3457 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3458 u8 ifa_flags;
3459 int err;
3460
3461 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3462 if (err < 0)
3463 return err;
3464
3465 ifm = nlmsg_data(nlh);
3466 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3467 if (pfx == NULL)
3468 return -EINVAL;
3469
3470 if (tb[IFA_CACHEINFO]) {
3471 struct ifa_cacheinfo *ci;
3472
3473 ci = nla_data(tb[IFA_CACHEINFO]);
3474 valid_lft = ci->ifa_valid;
3475 preferred_lft = ci->ifa_prefered;
3476 } else {
3477 preferred_lft = INFINITY_LIFE_TIME;
3478 valid_lft = INFINITY_LIFE_TIME;
3479 }
3480
3481 dev = __dev_get_by_index(net, ifm->ifa_index);
3482 if (dev == NULL)
3483 return -ENODEV;
3484
3485 /* We ignore other flags so far. */
3486 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3487
3488 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3489 if (ifa == NULL) {
3490 /*
3491 * It would be best to check for !NLM_F_CREATE here but
3492 * userspace alreay relies on not having to provide this.
3493 */
3494 return inet6_addr_add(net, ifm->ifa_index, pfx,
3495 ifm->ifa_prefixlen, ifa_flags,
3496 preferred_lft, valid_lft);
3497 }
3498
3499 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3500 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3501 err = -EEXIST;
3502 else
3503 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3504
3505 in6_ifa_put(ifa);
3506
3507 return err;
3508 }
3509
3510 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3511 u8 scope, int ifindex)
3512 {
3513 struct ifaddrmsg *ifm;
3514
3515 ifm = nlmsg_data(nlh);
3516 ifm->ifa_family = AF_INET6;
3517 ifm->ifa_prefixlen = prefixlen;
3518 ifm->ifa_flags = flags;
3519 ifm->ifa_scope = scope;
3520 ifm->ifa_index = ifindex;
3521 }
3522
3523 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3524 unsigned long tstamp, u32 preferred, u32 valid)
3525 {
3526 struct ifa_cacheinfo ci;
3527
3528 ci.cstamp = cstamp_delta(cstamp);
3529 ci.tstamp = cstamp_delta(tstamp);
3530 ci.ifa_prefered = preferred;
3531 ci.ifa_valid = valid;
3532
3533 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3534 }
3535
3536 static inline int rt_scope(int ifa_scope)
3537 {
3538 if (ifa_scope & IFA_HOST)
3539 return RT_SCOPE_HOST;
3540 else if (ifa_scope & IFA_LINK)
3541 return RT_SCOPE_LINK;
3542 else if (ifa_scope & IFA_SITE)
3543 return RT_SCOPE_SITE;
3544 else
3545 return RT_SCOPE_UNIVERSE;
3546 }
3547
3548 static inline int inet6_ifaddr_msgsize(void)
3549 {
3550 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3551 + nla_total_size(16) /* IFA_ADDRESS */
3552 + nla_total_size(sizeof(struct ifa_cacheinfo));
3553 }
3554
3555 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3556 u32 pid, u32 seq, int event, unsigned int flags)
3557 {
3558 struct nlmsghdr *nlh;
3559 u32 preferred, valid;
3560
3561 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3562 if (nlh == NULL)
3563 return -EMSGSIZE;
3564
3565 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3566 ifa->idev->dev->ifindex);
3567
3568 if (!(ifa->flags&IFA_F_PERMANENT)) {
3569 preferred = ifa->prefered_lft;
3570 valid = ifa->valid_lft;
3571 if (preferred != INFINITY_LIFE_TIME) {
3572 long tval = (jiffies - ifa->tstamp)/HZ;
3573 if (preferred > tval)
3574 preferred -= tval;
3575 else
3576 preferred = 0;
3577 if (valid != INFINITY_LIFE_TIME) {
3578 if (valid > tval)
3579 valid -= tval;
3580 else
3581 valid = 0;
3582 }
3583 }
3584 } else {
3585 preferred = INFINITY_LIFE_TIME;
3586 valid = INFINITY_LIFE_TIME;
3587 }
3588
3589 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3590 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3591 nlmsg_cancel(skb, nlh);
3592 return -EMSGSIZE;
3593 }
3594
3595 return nlmsg_end(skb, nlh);
3596 }
3597
3598 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3599 u32 pid, u32 seq, int event, u16 flags)
3600 {
3601 struct nlmsghdr *nlh;
3602 u8 scope = RT_SCOPE_UNIVERSE;
3603 int ifindex = ifmca->idev->dev->ifindex;
3604
3605 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3606 scope = RT_SCOPE_SITE;
3607
3608 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3609 if (nlh == NULL)
3610 return -EMSGSIZE;
3611
3612 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3613 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3614 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3615 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3616 nlmsg_cancel(skb, nlh);
3617 return -EMSGSIZE;
3618 }
3619
3620 return nlmsg_end(skb, nlh);
3621 }
3622
3623 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3624 u32 pid, u32 seq, int event, unsigned int flags)
3625 {
3626 struct nlmsghdr *nlh;
3627 u8 scope = RT_SCOPE_UNIVERSE;
3628 int ifindex = ifaca->aca_idev->dev->ifindex;
3629
3630 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3631 scope = RT_SCOPE_SITE;
3632
3633 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3634 if (nlh == NULL)
3635 return -EMSGSIZE;
3636
3637 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3638 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3639 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3640 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3641 nlmsg_cancel(skb, nlh);
3642 return -EMSGSIZE;
3643 }
3644
3645 return nlmsg_end(skb, nlh);
3646 }
3647
3648 enum addr_type_t {
3649 UNICAST_ADDR,
3650 MULTICAST_ADDR,
3651 ANYCAST_ADDR,
3652 };
3653
3654 /* called with rcu_read_lock() */
3655 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3656 struct netlink_callback *cb, enum addr_type_t type,
3657 int s_ip_idx, int *p_ip_idx)
3658 {
3659 struct ifmcaddr6 *ifmca;
3660 struct ifacaddr6 *ifaca;
3661 int err = 1;
3662 int ip_idx = *p_ip_idx;
3663
3664 read_lock_bh(&idev->lock);
3665 switch (type) {
3666 case UNICAST_ADDR: {
3667 struct inet6_ifaddr *ifa;
3668
3669 /* unicast address incl. temp addr */
3670 list_for_each_entry(ifa, &idev->addr_list, if_list) {
3671 if (++ip_idx < s_ip_idx)
3672 continue;
3673 err = inet6_fill_ifaddr(skb, ifa,
3674 NETLINK_CB(cb->skb).pid,
3675 cb->nlh->nlmsg_seq,
3676 RTM_NEWADDR,
3677 NLM_F_MULTI);
3678 if (err <= 0)
3679 break;
3680 }
3681 break;
3682 }
3683 case MULTICAST_ADDR:
3684 /* multicast address */
3685 for (ifmca = idev->mc_list; ifmca;
3686 ifmca = ifmca->next, ip_idx++) {
3687 if (ip_idx < s_ip_idx)
3688 continue;
3689 err = inet6_fill_ifmcaddr(skb, ifmca,
3690 NETLINK_CB(cb->skb).pid,
3691 cb->nlh->nlmsg_seq,
3692 RTM_GETMULTICAST,
3693 NLM_F_MULTI);
3694 if (err <= 0)
3695 break;
3696 }
3697 break;
3698 case ANYCAST_ADDR:
3699 /* anycast address */
3700 for (ifaca = idev->ac_list; ifaca;
3701 ifaca = ifaca->aca_next, ip_idx++) {
3702 if (ip_idx < s_ip_idx)
3703 continue;
3704 err = inet6_fill_ifacaddr(skb, ifaca,
3705 NETLINK_CB(cb->skb).pid,
3706 cb->nlh->nlmsg_seq,
3707 RTM_GETANYCAST,
3708 NLM_F_MULTI);
3709 if (err <= 0)
3710 break;
3711 }
3712 break;
3713 default:
3714 break;
3715 }
3716 read_unlock_bh(&idev->lock);
3717 *p_ip_idx = ip_idx;
3718 return err;
3719 }
3720
3721 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3722 enum addr_type_t type)
3723 {
3724 struct net *net = sock_net(skb->sk);
3725 int h, s_h;
3726 int idx, ip_idx;
3727 int s_idx, s_ip_idx;
3728 struct net_device *dev;
3729 struct inet6_dev *idev;
3730 struct hlist_head *head;
3731 struct hlist_node *node;
3732
3733 s_h = cb->args[0];
3734 s_idx = idx = cb->args[1];
3735 s_ip_idx = ip_idx = cb->args[2];
3736
3737 rcu_read_lock();
3738 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3739 idx = 0;
3740 head = &net->dev_index_head[h];
3741 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3742 if (idx < s_idx)
3743 goto cont;
3744 if (h > s_h || idx > s_idx)
3745 s_ip_idx = 0;
3746 ip_idx = 0;
3747 idev = __in6_dev_get(dev);
3748 if (!idev)
3749 goto cont;
3750
3751 if (in6_dump_addrs(idev, skb, cb, type,
3752 s_ip_idx, &ip_idx) <= 0)
3753 goto done;
3754 cont:
3755 idx++;
3756 }
3757 }
3758 done:
3759 rcu_read_unlock();
3760 cb->args[0] = h;
3761 cb->args[1] = idx;
3762 cb->args[2] = ip_idx;
3763
3764 return skb->len;
3765 }
3766
3767 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3768 {
3769 enum addr_type_t type = UNICAST_ADDR;
3770
3771 return inet6_dump_addr(skb, cb, type);
3772 }
3773
3774 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3775 {
3776 enum addr_type_t type = MULTICAST_ADDR;
3777
3778 return inet6_dump_addr(skb, cb, type);
3779 }
3780
3781
3782 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3783 {
3784 enum addr_type_t type = ANYCAST_ADDR;
3785
3786 return inet6_dump_addr(skb, cb, type);
3787 }
3788
3789 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
3790 void *arg)
3791 {
3792 struct net *net = sock_net(in_skb->sk);
3793 struct ifaddrmsg *ifm;
3794 struct nlattr *tb[IFA_MAX+1];
3795 struct in6_addr *addr = NULL;
3796 struct net_device *dev = NULL;
3797 struct inet6_ifaddr *ifa;
3798 struct sk_buff *skb;
3799 int err;
3800
3801 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3802 if (err < 0)
3803 goto errout;
3804
3805 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3806 if (addr == NULL) {
3807 err = -EINVAL;
3808 goto errout;
3809 }
3810
3811 ifm = nlmsg_data(nlh);
3812 if (ifm->ifa_index)
3813 dev = __dev_get_by_index(net, ifm->ifa_index);
3814
3815 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
3816 if (!ifa) {
3817 err = -EADDRNOTAVAIL;
3818 goto errout;
3819 }
3820
3821 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
3822 if (!skb) {
3823 err = -ENOBUFS;
3824 goto errout_ifa;
3825 }
3826
3827 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3828 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3829 if (err < 0) {
3830 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3831 WARN_ON(err == -EMSGSIZE);
3832 kfree_skb(skb);
3833 goto errout_ifa;
3834 }
3835 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
3836 errout_ifa:
3837 in6_ifa_put(ifa);
3838 errout:
3839 return err;
3840 }
3841
3842 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3843 {
3844 struct sk_buff *skb;
3845 struct net *net = dev_net(ifa->idev->dev);
3846 int err = -ENOBUFS;
3847
3848 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3849 if (skb == NULL)
3850 goto errout;
3851
3852 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3853 if (err < 0) {
3854 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3855 WARN_ON(err == -EMSGSIZE);
3856 kfree_skb(skb);
3857 goto errout;
3858 }
3859 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3860 return;
3861 errout:
3862 if (err < 0)
3863 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3864 }
3865
3866 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3867 __s32 *array, int bytes)
3868 {
3869 BUG_ON(bytes < (DEVCONF_MAX * 4));
3870
3871 memset(array, 0, bytes);
3872 array[DEVCONF_FORWARDING] = cnf->forwarding;
3873 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3874 array[DEVCONF_MTU6] = cnf->mtu6;
3875 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3876 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3877 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3878 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3879 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3880 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
3881 jiffies_to_msecs(cnf->rtr_solicit_interval);
3882 array[DEVCONF_RTR_SOLICIT_DELAY] =
3883 jiffies_to_msecs(cnf->rtr_solicit_delay);
3884 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3885 #ifdef CONFIG_IPV6_PRIVACY
3886 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3887 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3888 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3889 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3890 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3891 #endif
3892 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3893 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3894 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3895 #ifdef CONFIG_IPV6_ROUTER_PREF
3896 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3897 array[DEVCONF_RTR_PROBE_INTERVAL] =
3898 jiffies_to_msecs(cnf->rtr_probe_interval);
3899 #ifdef CONFIG_IPV6_ROUTE_INFO
3900 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3901 #endif
3902 #endif
3903 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3904 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3905 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3906 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3907 #endif
3908 #ifdef CONFIG_IPV6_MROUTE
3909 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
3910 #endif
3911 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
3912 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
3913 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
3914 }
3915
3916 static inline size_t inet6_ifla6_size(void)
3917 {
3918 return nla_total_size(4) /* IFLA_INET6_FLAGS */
3919 + nla_total_size(sizeof(struct ifla_cacheinfo))
3920 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3921 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3922 + nla_total_size(ICMP6_MIB_MAX * 8); /* IFLA_INET6_ICMP6STATS */
3923 }
3924
3925 static inline size_t inet6_if_nlmsg_size(void)
3926 {
3927 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3928 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3929 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3930 + nla_total_size(4) /* IFLA_MTU */
3931 + nla_total_size(4) /* IFLA_LINK */
3932 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
3933 }
3934
3935 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
3936 int items, int bytes)
3937 {
3938 int i;
3939 int pad = bytes - sizeof(u64) * items;
3940 BUG_ON(pad < 0);
3941
3942 /* Use put_unaligned() because stats may not be aligned for u64. */
3943 put_unaligned(items, &stats[0]);
3944 for (i = 1; i < items; i++)
3945 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
3946
3947 memset(&stats[items], 0, pad);
3948 }
3949
3950 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib,
3951 int items, int bytes, size_t syncpoff)
3952 {
3953 int i;
3954 int pad = bytes - sizeof(u64) * items;
3955 BUG_ON(pad < 0);
3956
3957 /* Use put_unaligned() because stats may not be aligned for u64. */
3958 put_unaligned(items, &stats[0]);
3959 for (i = 1; i < items; i++)
3960 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
3961
3962 memset(&stats[items], 0, pad);
3963 }
3964
3965 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3966 int bytes)
3967 {
3968 switch (attrtype) {
3969 case IFLA_INET6_STATS:
3970 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6,
3971 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
3972 break;
3973 case IFLA_INET6_ICMP6STATS:
3974 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
3975 break;
3976 }
3977 }
3978
3979 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
3980 {
3981 struct nlattr *nla;
3982 struct ifla_cacheinfo ci;
3983
3984 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
3985 goto nla_put_failure;
3986 ci.max_reasm_len = IPV6_MAXPLEN;
3987 ci.tstamp = cstamp_delta(idev->tstamp);
3988 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
3989 ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time);
3990 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
3991 goto nla_put_failure;
3992 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3993 if (nla == NULL)
3994 goto nla_put_failure;
3995 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
3996
3997 /* XXX - MC not implemented */
3998
3999 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4000 if (nla == NULL)
4001 goto nla_put_failure;
4002 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4003
4004 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4005 if (nla == NULL)
4006 goto nla_put_failure;
4007 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4008
4009 return 0;
4010
4011 nla_put_failure:
4012 return -EMSGSIZE;
4013 }
4014
4015 static size_t inet6_get_link_af_size(const struct net_device *dev)
4016 {
4017 if (!__in6_dev_get(dev))
4018 return 0;
4019
4020 return inet6_ifla6_size();
4021 }
4022
4023 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
4024 {
4025 struct inet6_dev *idev = __in6_dev_get(dev);
4026
4027 if (!idev)
4028 return -ENODATA;
4029
4030 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4031 return -EMSGSIZE;
4032
4033 return 0;
4034 }
4035
4036 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
4037 u32 pid, u32 seq, int event, unsigned int flags)
4038 {
4039 struct net_device *dev = idev->dev;
4040 struct ifinfomsg *hdr;
4041 struct nlmsghdr *nlh;
4042 void *protoinfo;
4043
4044 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
4045 if (nlh == NULL)
4046 return -EMSGSIZE;
4047
4048 hdr = nlmsg_data(nlh);
4049 hdr->ifi_family = AF_INET6;
4050 hdr->__ifi_pad = 0;
4051 hdr->ifi_type = dev->type;
4052 hdr->ifi_index = dev->ifindex;
4053 hdr->ifi_flags = dev_get_flags(dev);
4054 hdr->ifi_change = 0;
4055
4056 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4057 (dev->addr_len &&
4058 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4059 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4060 (dev->ifindex != dev->iflink &&
4061 nla_put_u32(skb, IFLA_LINK, dev->iflink)))
4062 goto nla_put_failure;
4063 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4064 if (protoinfo == NULL)
4065 goto nla_put_failure;
4066
4067 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4068 goto nla_put_failure;
4069
4070 nla_nest_end(skb, protoinfo);
4071 return nlmsg_end(skb, nlh);
4072
4073 nla_put_failure:
4074 nlmsg_cancel(skb, nlh);
4075 return -EMSGSIZE;
4076 }
4077
4078 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4079 {
4080 struct net *net = sock_net(skb->sk);
4081 int h, s_h;
4082 int idx = 0, s_idx;
4083 struct net_device *dev;
4084 struct inet6_dev *idev;
4085 struct hlist_head *head;
4086 struct hlist_node *node;
4087
4088 s_h = cb->args[0];
4089 s_idx = cb->args[1];
4090
4091 rcu_read_lock();
4092 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4093 idx = 0;
4094 head = &net->dev_index_head[h];
4095 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
4096 if (idx < s_idx)
4097 goto cont;
4098 idev = __in6_dev_get(dev);
4099 if (!idev)
4100 goto cont;
4101 if (inet6_fill_ifinfo(skb, idev,
4102 NETLINK_CB(cb->skb).pid,
4103 cb->nlh->nlmsg_seq,
4104 RTM_NEWLINK, NLM_F_MULTI) <= 0)
4105 goto out;
4106 cont:
4107 idx++;
4108 }
4109 }
4110 out:
4111 rcu_read_unlock();
4112 cb->args[1] = idx;
4113 cb->args[0] = h;
4114
4115 return skb->len;
4116 }
4117
4118 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4119 {
4120 struct sk_buff *skb;
4121 struct net *net = dev_net(idev->dev);
4122 int err = -ENOBUFS;
4123
4124 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
4125 if (skb == NULL)
4126 goto errout;
4127
4128 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
4129 if (err < 0) {
4130 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4131 WARN_ON(err == -EMSGSIZE);
4132 kfree_skb(skb);
4133 goto errout;
4134 }
4135 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
4136 return;
4137 errout:
4138 if (err < 0)
4139 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
4140 }
4141
4142 static inline size_t inet6_prefix_nlmsg_size(void)
4143 {
4144 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4145 + nla_total_size(sizeof(struct in6_addr))
4146 + nla_total_size(sizeof(struct prefix_cacheinfo));
4147 }
4148
4149 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
4150 struct prefix_info *pinfo, u32 pid, u32 seq,
4151 int event, unsigned int flags)
4152 {
4153 struct prefixmsg *pmsg;
4154 struct nlmsghdr *nlh;
4155 struct prefix_cacheinfo ci;
4156
4157 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
4158 if (nlh == NULL)
4159 return -EMSGSIZE;
4160
4161 pmsg = nlmsg_data(nlh);
4162 pmsg->prefix_family = AF_INET6;
4163 pmsg->prefix_pad1 = 0;
4164 pmsg->prefix_pad2 = 0;
4165 pmsg->prefix_ifindex = idev->dev->ifindex;
4166 pmsg->prefix_len = pinfo->prefix_len;
4167 pmsg->prefix_type = pinfo->type;
4168 pmsg->prefix_pad3 = 0;
4169 pmsg->prefix_flags = 0;
4170 if (pinfo->onlink)
4171 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4172 if (pinfo->autoconf)
4173 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4174
4175 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
4176 goto nla_put_failure;
4177 ci.preferred_time = ntohl(pinfo->prefered);
4178 ci.valid_time = ntohl(pinfo->valid);
4179 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
4180 goto nla_put_failure;
4181 return nlmsg_end(skb, nlh);
4182
4183 nla_put_failure:
4184 nlmsg_cancel(skb, nlh);
4185 return -EMSGSIZE;
4186 }
4187
4188 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
4189 struct prefix_info *pinfo)
4190 {
4191 struct sk_buff *skb;
4192 struct net *net = dev_net(idev->dev);
4193 int err = -ENOBUFS;
4194
4195 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
4196 if (skb == NULL)
4197 goto errout;
4198
4199 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
4200 if (err < 0) {
4201 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4202 WARN_ON(err == -EMSGSIZE);
4203 kfree_skb(skb);
4204 goto errout;
4205 }
4206 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4207 return;
4208 errout:
4209 if (err < 0)
4210 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
4211 }
4212
4213 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4214 {
4215 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4216
4217 switch (event) {
4218 case RTM_NEWADDR:
4219 /*
4220 * If the address was optimistic
4221 * we inserted the route at the start of
4222 * our DAD process, so we don't need
4223 * to do it again
4224 */
4225 if (!(ifp->rt->rt6i_node))
4226 ip6_ins_rt(ifp->rt);
4227 if (ifp->idev->cnf.forwarding)
4228 addrconf_join_anycast(ifp);
4229 break;
4230 case RTM_DELADDR:
4231 if (ifp->idev->cnf.forwarding)
4232 addrconf_leave_anycast(ifp);
4233 addrconf_leave_solict(ifp->idev, &ifp->addr);
4234 dst_hold(&ifp->rt->dst);
4235
4236 if (ip6_del_rt(ifp->rt))
4237 dst_free(&ifp->rt->dst);
4238 break;
4239 }
4240 }
4241
4242 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4243 {
4244 rcu_read_lock_bh();
4245 if (likely(ifp->idev->dead == 0))
4246 __ipv6_ifa_notify(event, ifp);
4247 rcu_read_unlock_bh();
4248 }
4249
4250 #ifdef CONFIG_SYSCTL
4251
4252 static
4253 int addrconf_sysctl_forward(ctl_table *ctl, int write,
4254 void __user *buffer, size_t *lenp, loff_t *ppos)
4255 {
4256 int *valp = ctl->data;
4257 int val = *valp;
4258 loff_t pos = *ppos;
4259 ctl_table lctl;
4260 int ret;
4261
4262 /*
4263 * ctl->data points to idev->cnf.forwarding, we should
4264 * not modify it until we get the rtnl lock.
4265 */
4266 lctl = *ctl;
4267 lctl.data = &val;
4268
4269 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4270
4271 if (write)
4272 ret = addrconf_fixup_forwarding(ctl, valp, val);
4273 if (ret)
4274 *ppos = pos;
4275 return ret;
4276 }
4277
4278 static void dev_disable_change(struct inet6_dev *idev)
4279 {
4280 if (!idev || !idev->dev)
4281 return;
4282
4283 if (idev->cnf.disable_ipv6)
4284 addrconf_notify(NULL, NETDEV_DOWN, idev->dev);
4285 else
4286 addrconf_notify(NULL, NETDEV_UP, idev->dev);
4287 }
4288
4289 static void addrconf_disable_change(struct net *net, __s32 newf)
4290 {
4291 struct net_device *dev;
4292 struct inet6_dev *idev;
4293
4294 rcu_read_lock();
4295 for_each_netdev_rcu(net, dev) {
4296 idev = __in6_dev_get(dev);
4297 if (idev) {
4298 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4299 idev->cnf.disable_ipv6 = newf;
4300 if (changed)
4301 dev_disable_change(idev);
4302 }
4303 }
4304 rcu_read_unlock();
4305 }
4306
4307 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
4308 {
4309 struct net *net;
4310 int old;
4311
4312 if (!rtnl_trylock())
4313 return restart_syscall();
4314
4315 net = (struct net *)table->extra2;
4316 old = *p;
4317 *p = newf;
4318
4319 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
4320 rtnl_unlock();
4321 return 0;
4322 }
4323
4324 if (p == &net->ipv6.devconf_all->disable_ipv6) {
4325 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4326 addrconf_disable_change(net, newf);
4327 } else if ((!newf) ^ (!old))
4328 dev_disable_change((struct inet6_dev *)table->extra1);
4329
4330 rtnl_unlock();
4331 return 0;
4332 }
4333
4334 static
4335 int addrconf_sysctl_disable(ctl_table *ctl, int write,
4336 void __user *buffer, size_t *lenp, loff_t *ppos)
4337 {
4338 int *valp = ctl->data;
4339 int val = *valp;
4340 loff_t pos = *ppos;
4341 ctl_table lctl;
4342 int ret;
4343
4344 /*
4345 * ctl->data points to idev->cnf.disable_ipv6, we should
4346 * not modify it until we get the rtnl lock.
4347 */
4348 lctl = *ctl;
4349 lctl.data = &val;
4350
4351 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4352
4353 if (write)
4354 ret = addrconf_disable_ipv6(ctl, valp, val);
4355 if (ret)
4356 *ppos = pos;
4357 return ret;
4358 }
4359
4360 static struct addrconf_sysctl_table
4361 {
4362 struct ctl_table_header *sysctl_header;
4363 ctl_table addrconf_vars[DEVCONF_MAX+1];
4364 } addrconf_sysctl __read_mostly = {
4365 .sysctl_header = NULL,
4366 .addrconf_vars = {
4367 {
4368 .procname = "forwarding",
4369 .data = &ipv6_devconf.forwarding,
4370 .maxlen = sizeof(int),
4371 .mode = 0644,
4372 .proc_handler = addrconf_sysctl_forward,
4373 },
4374 {
4375 .procname = "hop_limit",
4376 .data = &ipv6_devconf.hop_limit,
4377 .maxlen = sizeof(int),
4378 .mode = 0644,
4379 .proc_handler = proc_dointvec,
4380 },
4381 {
4382 .procname = "mtu",
4383 .data = &ipv6_devconf.mtu6,
4384 .maxlen = sizeof(int),
4385 .mode = 0644,
4386 .proc_handler = proc_dointvec,
4387 },
4388 {
4389 .procname = "accept_ra",
4390 .data = &ipv6_devconf.accept_ra,
4391 .maxlen = sizeof(int),
4392 .mode = 0644,
4393 .proc_handler = proc_dointvec,
4394 },
4395 {
4396 .procname = "accept_redirects",
4397 .data = &ipv6_devconf.accept_redirects,
4398 .maxlen = sizeof(int),
4399 .mode = 0644,
4400 .proc_handler = proc_dointvec,
4401 },
4402 {
4403 .procname = "autoconf",
4404 .data = &ipv6_devconf.autoconf,
4405 .maxlen = sizeof(int),
4406 .mode = 0644,
4407 .proc_handler = proc_dointvec,
4408 },
4409 {
4410 .procname = "dad_transmits",
4411 .data = &ipv6_devconf.dad_transmits,
4412 .maxlen = sizeof(int),
4413 .mode = 0644,
4414 .proc_handler = proc_dointvec,
4415 },
4416 {
4417 .procname = "router_solicitations",
4418 .data = &ipv6_devconf.rtr_solicits,
4419 .maxlen = sizeof(int),
4420 .mode = 0644,
4421 .proc_handler = proc_dointvec,
4422 },
4423 {
4424 .procname = "router_solicitation_interval",
4425 .data = &ipv6_devconf.rtr_solicit_interval,
4426 .maxlen = sizeof(int),
4427 .mode = 0644,
4428 .proc_handler = proc_dointvec_jiffies,
4429 },
4430 {
4431 .procname = "router_solicitation_delay",
4432 .data = &ipv6_devconf.rtr_solicit_delay,
4433 .maxlen = sizeof(int),
4434 .mode = 0644,
4435 .proc_handler = proc_dointvec_jiffies,
4436 },
4437 {
4438 .procname = "force_mld_version",
4439 .data = &ipv6_devconf.force_mld_version,
4440 .maxlen = sizeof(int),
4441 .mode = 0644,
4442 .proc_handler = proc_dointvec,
4443 },
4444 #ifdef CONFIG_IPV6_PRIVACY
4445 {
4446 .procname = "use_tempaddr",
4447 .data = &ipv6_devconf.use_tempaddr,
4448 .maxlen = sizeof(int),
4449 .mode = 0644,
4450 .proc_handler = proc_dointvec,
4451 },
4452 {
4453 .procname = "temp_valid_lft",
4454 .data = &ipv6_devconf.temp_valid_lft,
4455 .maxlen = sizeof(int),
4456 .mode = 0644,
4457 .proc_handler = proc_dointvec,
4458 },
4459 {
4460 .procname = "temp_prefered_lft",
4461 .data = &ipv6_devconf.temp_prefered_lft,
4462 .maxlen = sizeof(int),
4463 .mode = 0644,
4464 .proc_handler = proc_dointvec,
4465 },
4466 {
4467 .procname = "regen_max_retry",
4468 .data = &ipv6_devconf.regen_max_retry,
4469 .maxlen = sizeof(int),
4470 .mode = 0644,
4471 .proc_handler = proc_dointvec,
4472 },
4473 {
4474 .procname = "max_desync_factor",
4475 .data = &ipv6_devconf.max_desync_factor,
4476 .maxlen = sizeof(int),
4477 .mode = 0644,
4478 .proc_handler = proc_dointvec,
4479 },
4480 #endif
4481 {
4482 .procname = "max_addresses",
4483 .data = &ipv6_devconf.max_addresses,
4484 .maxlen = sizeof(int),
4485 .mode = 0644,
4486 .proc_handler = proc_dointvec,
4487 },
4488 {
4489 .procname = "accept_ra_defrtr",
4490 .data = &ipv6_devconf.accept_ra_defrtr,
4491 .maxlen = sizeof(int),
4492 .mode = 0644,
4493 .proc_handler = proc_dointvec,
4494 },
4495 {
4496 .procname = "accept_ra_pinfo",
4497 .data = &ipv6_devconf.accept_ra_pinfo,
4498 .maxlen = sizeof(int),
4499 .mode = 0644,
4500 .proc_handler = proc_dointvec,
4501 },
4502 #ifdef CONFIG_IPV6_ROUTER_PREF
4503 {
4504 .procname = "accept_ra_rtr_pref",
4505 .data = &ipv6_devconf.accept_ra_rtr_pref,
4506 .maxlen = sizeof(int),
4507 .mode = 0644,
4508 .proc_handler = proc_dointvec,
4509 },
4510 {
4511 .procname = "router_probe_interval",
4512 .data = &ipv6_devconf.rtr_probe_interval,
4513 .maxlen = sizeof(int),
4514 .mode = 0644,
4515 .proc_handler = proc_dointvec_jiffies,
4516 },
4517 #ifdef CONFIG_IPV6_ROUTE_INFO
4518 {
4519 .procname = "accept_ra_rt_info_max_plen",
4520 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4521 .maxlen = sizeof(int),
4522 .mode = 0644,
4523 .proc_handler = proc_dointvec,
4524 },
4525 #endif
4526 #endif
4527 {
4528 .procname = "proxy_ndp",
4529 .data = &ipv6_devconf.proxy_ndp,
4530 .maxlen = sizeof(int),
4531 .mode = 0644,
4532 .proc_handler = proc_dointvec,
4533 },
4534 {
4535 .procname = "accept_source_route",
4536 .data = &ipv6_devconf.accept_source_route,
4537 .maxlen = sizeof(int),
4538 .mode = 0644,
4539 .proc_handler = proc_dointvec,
4540 },
4541 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4542 {
4543 .procname = "optimistic_dad",
4544 .data = &ipv6_devconf.optimistic_dad,
4545 .maxlen = sizeof(int),
4546 .mode = 0644,
4547 .proc_handler = proc_dointvec,
4548
4549 },
4550 #endif
4551 #ifdef CONFIG_IPV6_MROUTE
4552 {
4553 .procname = "mc_forwarding",
4554 .data = &ipv6_devconf.mc_forwarding,
4555 .maxlen = sizeof(int),
4556 .mode = 0444,
4557 .proc_handler = proc_dointvec,
4558 },
4559 #endif
4560 {
4561 .procname = "disable_ipv6",
4562 .data = &ipv6_devconf.disable_ipv6,
4563 .maxlen = sizeof(int),
4564 .mode = 0644,
4565 .proc_handler = addrconf_sysctl_disable,
4566 },
4567 {
4568 .procname = "accept_dad",
4569 .data = &ipv6_devconf.accept_dad,
4570 .maxlen = sizeof(int),
4571 .mode = 0644,
4572 .proc_handler = proc_dointvec,
4573 },
4574 {
4575 .procname = "force_tllao",
4576 .data = &ipv6_devconf.force_tllao,
4577 .maxlen = sizeof(int),
4578 .mode = 0644,
4579 .proc_handler = proc_dointvec
4580 },
4581 {
4582 /* sentinel */
4583 }
4584 },
4585 };
4586
4587 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4588 struct inet6_dev *idev, struct ipv6_devconf *p)
4589 {
4590 int i;
4591 struct addrconf_sysctl_table *t;
4592 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
4593
4594 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4595 if (t == NULL)
4596 goto out;
4597
4598 for (i = 0; t->addrconf_vars[i].data; i++) {
4599 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
4600 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4601 t->addrconf_vars[i].extra2 = net;
4602 }
4603
4604 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
4605
4606 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
4607 if (t->sysctl_header == NULL)
4608 goto free;
4609
4610 p->sysctl = t;
4611 return 0;
4612
4613 free:
4614 kfree(t);
4615 out:
4616 return -ENOBUFS;
4617 }
4618
4619 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4620 {
4621 struct addrconf_sysctl_table *t;
4622
4623 if (p->sysctl == NULL)
4624 return;
4625
4626 t = p->sysctl;
4627 p->sysctl = NULL;
4628 unregister_net_sysctl_table(t->sysctl_header);
4629 kfree(t);
4630 }
4631
4632 static void addrconf_sysctl_register(struct inet6_dev *idev)
4633 {
4634 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
4635 &ndisc_ifinfo_sysctl_change);
4636 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
4637 idev, &idev->cnf);
4638 }
4639
4640 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
4641 {
4642 __addrconf_sysctl_unregister(&idev->cnf);
4643 neigh_sysctl_unregister(idev->nd_parms);
4644 }
4645
4646
4647 #endif
4648
4649 static int __net_init addrconf_init_net(struct net *net)
4650 {
4651 int err;
4652 struct ipv6_devconf *all, *dflt;
4653
4654 err = -ENOMEM;
4655 all = &ipv6_devconf;
4656 dflt = &ipv6_devconf_dflt;
4657
4658 if (!net_eq(net, &init_net)) {
4659 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4660 if (all == NULL)
4661 goto err_alloc_all;
4662
4663 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4664 if (dflt == NULL)
4665 goto err_alloc_dflt;
4666 } else {
4667 /* these will be inherited by all namespaces */
4668 dflt->autoconf = ipv6_defaults.autoconf;
4669 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
4670 }
4671
4672 net->ipv6.devconf_all = all;
4673 net->ipv6.devconf_dflt = dflt;
4674
4675 #ifdef CONFIG_SYSCTL
4676 err = __addrconf_sysctl_register(net, "all", NULL, all);
4677 if (err < 0)
4678 goto err_reg_all;
4679
4680 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
4681 if (err < 0)
4682 goto err_reg_dflt;
4683 #endif
4684 return 0;
4685
4686 #ifdef CONFIG_SYSCTL
4687 err_reg_dflt:
4688 __addrconf_sysctl_unregister(all);
4689 err_reg_all:
4690 kfree(dflt);
4691 #endif
4692 err_alloc_dflt:
4693 kfree(all);
4694 err_alloc_all:
4695 return err;
4696 }
4697
4698 static void __net_exit addrconf_exit_net(struct net *net)
4699 {
4700 #ifdef CONFIG_SYSCTL
4701 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4702 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4703 #endif
4704 if (!net_eq(net, &init_net)) {
4705 kfree(net->ipv6.devconf_dflt);
4706 kfree(net->ipv6.devconf_all);
4707 }
4708 }
4709
4710 static struct pernet_operations addrconf_ops = {
4711 .init = addrconf_init_net,
4712 .exit = addrconf_exit_net,
4713 };
4714
4715 /*
4716 * Device notifier
4717 */
4718
4719 int register_inet6addr_notifier(struct notifier_block *nb)
4720 {
4721 return atomic_notifier_chain_register(&inet6addr_chain, nb);
4722 }
4723 EXPORT_SYMBOL(register_inet6addr_notifier);
4724
4725 int unregister_inet6addr_notifier(struct notifier_block *nb)
4726 {
4727 return atomic_notifier_chain_unregister(&inet6addr_chain, nb);
4728 }
4729 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4730
4731 static struct rtnl_af_ops inet6_ops = {
4732 .family = AF_INET6,
4733 .fill_link_af = inet6_fill_link_af,
4734 .get_link_af_size = inet6_get_link_af_size,
4735 };
4736
4737 /*
4738 * Init / cleanup code
4739 */
4740
4741 int __init addrconf_init(void)
4742 {
4743 int i, err;
4744
4745 err = ipv6_addr_label_init();
4746 if (err < 0) {
4747 pr_crit("%s: cannot initialize default policy table: %d\n",
4748 __func__, err);
4749 goto out;
4750 }
4751
4752 err = register_pernet_subsys(&addrconf_ops);
4753 if (err < 0)
4754 goto out_addrlabel;
4755
4756 /* The addrconf netdev notifier requires that loopback_dev
4757 * has it's ipv6 private information allocated and setup
4758 * before it can bring up and give link-local addresses
4759 * to other devices which are up.
4760 *
4761 * Unfortunately, loopback_dev is not necessarily the first
4762 * entry in the global dev_base list of net devices. In fact,
4763 * it is likely to be the very last entry on that list.
4764 * So this causes the notifier registry below to try and
4765 * give link-local addresses to all devices besides loopback_dev
4766 * first, then loopback_dev, which cases all the non-loopback_dev
4767 * devices to fail to get a link-local address.
4768 *
4769 * So, as a temporary fix, allocate the ipv6 structure for
4770 * loopback_dev first by hand.
4771 * Longer term, all of the dependencies ipv6 has upon the loopback
4772 * device and it being up should be removed.
4773 */
4774 rtnl_lock();
4775 if (!ipv6_add_dev(init_net.loopback_dev))
4776 err = -ENOMEM;
4777 rtnl_unlock();
4778 if (err)
4779 goto errlo;
4780
4781 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4782 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
4783
4784 register_netdevice_notifier(&ipv6_dev_notf);
4785
4786 addrconf_verify(0);
4787
4788 err = rtnl_af_register(&inet6_ops);
4789 if (err < 0)
4790 goto errout_af;
4791
4792 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
4793 NULL);
4794 if (err < 0)
4795 goto errout;
4796
4797 /* Only the first call to __rtnl_register can fail */
4798 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
4799 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
4800 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
4801 inet6_dump_ifaddr, NULL);
4802 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
4803 inet6_dump_ifmcaddr, NULL);
4804 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
4805 inet6_dump_ifacaddr, NULL);
4806
4807 ipv6_addr_label_rtnl_register();
4808
4809 return 0;
4810 errout:
4811 rtnl_af_unregister(&inet6_ops);
4812 errout_af:
4813 unregister_netdevice_notifier(&ipv6_dev_notf);
4814 errlo:
4815 unregister_pernet_subsys(&addrconf_ops);
4816 out_addrlabel:
4817 ipv6_addr_label_cleanup();
4818 out:
4819 return err;
4820 }
4821
4822 void addrconf_cleanup(void)
4823 {
4824 struct net_device *dev;
4825 int i;
4826
4827 unregister_netdevice_notifier(&ipv6_dev_notf);
4828 unregister_pernet_subsys(&addrconf_ops);
4829 ipv6_addr_label_cleanup();
4830
4831 rtnl_lock();
4832
4833 __rtnl_af_unregister(&inet6_ops);
4834
4835 /* clean dev list */
4836 for_each_netdev(&init_net, dev) {
4837 if (__in6_dev_get(dev) == NULL)
4838 continue;
4839 addrconf_ifdown(dev, 1);
4840 }
4841 addrconf_ifdown(init_net.loopback_dev, 2);
4842
4843 /*
4844 * Check hash table.
4845 */
4846 spin_lock_bh(&addrconf_hash_lock);
4847 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4848 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
4849 spin_unlock_bh(&addrconf_hash_lock);
4850
4851 del_timer(&addr_chk_timer);
4852 rtnl_unlock();
4853 }
Linux kernel - Deliverables
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