projects / GitHub / mt8127 / android_kernel_alcatel_ttab.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
ipv6: add ipv6_addr_hash() helper
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / net / ipv6 / addrconf.c
1 /*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 */
14
15 /*
16 * Changes:
17 *
18 * Janos Farkas : delete timer on ifdown
19 * <chexum@bankinf.banki.hu>
20 * Andi Kleen : kill double kfree on module
21 * unload.
22 * Maciej W. Rozycki : FDDI support
23 * sekiya@USAGI : Don't send too many RS
24 * packets.
25 * yoshfuji@USAGI : Fixed interval between DAD
26 * packets.
27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
28 * address validation timer.
29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
30 * support.
31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
32 * address on a same interface.
33 * YOSHIFUJI Hideaki @USAGI : ARCnet support
34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
35 * seq_file.
36 * YOSHIFUJI Hideaki @USAGI : improved source address
37 * selection; consider scope,
38 * status etc.
39 */
40
41 #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 rcu_read_lock();
498 for_each_netdev_rcu(net, dev) {
499 idev = __in6_dev_get(dev);
500 if (idev) {
501 int changed = (!idev->cnf.forwarding) ^ (!newf);
502 idev->cnf.forwarding = newf;
503 if (changed)
504 dev_forward_change(idev);
505 }
506 }
507 rcu_read_unlock();
508 }
509
510 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
511 {
512 struct net *net;
513 int old;
514
515 if (!rtnl_trylock())
516 return restart_syscall();
517
518 net = (struct net *)table->extra2;
519 old = *p;
520 *p = newf;
521
522 if (p == &net->ipv6.devconf_dflt->forwarding) {
523 rtnl_unlock();
524 return 0;
525 }
526
527 if (p == &net->ipv6.devconf_all->forwarding) {
528 net->ipv6.devconf_dflt->forwarding = newf;
529 addrconf_forward_change(net, newf);
530 } else if ((!newf) ^ (!old))
531 dev_forward_change((struct inet6_dev *)table->extra1);
532 rtnl_unlock();
533
534 if (newf)
535 rt6_purge_dflt_routers(net);
536 return 1;
537 }
538 #endif
539
540 /* Nobody refers to this ifaddr, destroy it */
541 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
542 {
543 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
544
545 #ifdef NET_REFCNT_DEBUG
546 pr_debug("%s\n", __func__);
547 #endif
548
549 in6_dev_put(ifp->idev);
550
551 if (del_timer(&ifp->timer))
552 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp);
553
554 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
555 pr_warn("Freeing alive inet6 address %p\n", ifp);
556 return;
557 }
558 dst_release(&ifp->rt->dst);
559
560 kfree_rcu(ifp, rcu);
561 }
562
563 static void
564 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
565 {
566 struct list_head *p;
567 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
568
569 /*
570 * Each device address list is sorted in order of scope -
571 * global before linklocal.
572 */
573 list_for_each(p, &idev->addr_list) {
574 struct inet6_ifaddr *ifa
575 = list_entry(p, struct inet6_ifaddr, if_list);
576 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
577 break;
578 }
579
580 list_add_tail(&ifp->if_list, p);
581 }
582
583 static u32 inet6_addr_hash(const struct in6_addr *addr)
584 {
585 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
586 }
587
588 /* On success it returns ifp with increased reference count */
589
590 static struct inet6_ifaddr *
591 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
592 int scope, u32 flags)
593 {
594 struct inet6_ifaddr *ifa = NULL;
595 struct rt6_info *rt;
596 unsigned int hash;
597 int err = 0;
598 int addr_type = ipv6_addr_type(addr);
599
600 if (addr_type == IPV6_ADDR_ANY ||
601 addr_type & IPV6_ADDR_MULTICAST ||
602 (!(idev->dev->flags & IFF_LOOPBACK) &&
603 addr_type & IPV6_ADDR_LOOPBACK))
604 return ERR_PTR(-EADDRNOTAVAIL);
605
606 rcu_read_lock_bh();
607 if (idev->dead) {
608 err = -ENODEV; /*XXX*/
609 goto out2;
610 }
611
612 if (idev->cnf.disable_ipv6) {
613 err = -EACCES;
614 goto out2;
615 }
616
617 spin_lock(&addrconf_hash_lock);
618
619 /* Ignore adding duplicate addresses on an interface */
620 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
621 ADBG(("ipv6_add_addr: already assigned\n"));
622 err = -EEXIST;
623 goto out;
624 }
625
626 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
627
628 if (ifa == NULL) {
629 ADBG(("ipv6_add_addr: malloc failed\n"));
630 err = -ENOBUFS;
631 goto out;
632 }
633
634 rt = addrconf_dst_alloc(idev, addr, false);
635 if (IS_ERR(rt)) {
636 err = PTR_ERR(rt);
637 goto out;
638 }
639
640 ifa->addr = *addr;
641
642 spin_lock_init(&ifa->lock);
643 spin_lock_init(&ifa->state_lock);
644 init_timer(&ifa->timer);
645 INIT_HLIST_NODE(&ifa->addr_lst);
646 ifa->timer.data = (unsigned long) ifa;
647 ifa->scope = scope;
648 ifa->prefix_len = pfxlen;
649 ifa->flags = flags | IFA_F_TENTATIVE;
650 ifa->cstamp = ifa->tstamp = jiffies;
651
652 ifa->rt = rt;
653
654 ifa->idev = idev;
655 in6_dev_hold(idev);
656 /* For caller */
657 in6_ifa_hold(ifa);
658
659 /* Add to big hash table */
660 hash = inet6_addr_hash(addr);
661
662 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
663 spin_unlock(&addrconf_hash_lock);
664
665 write_lock(&idev->lock);
666 /* Add to inet6_dev unicast addr list. */
667 ipv6_link_dev_addr(idev, ifa);
668
669 #ifdef CONFIG_IPV6_PRIVACY
670 if (ifa->flags&IFA_F_TEMPORARY) {
671 list_add(&ifa->tmp_list, &idev->tempaddr_list);
672 in6_ifa_hold(ifa);
673 }
674 #endif
675
676 in6_ifa_hold(ifa);
677 write_unlock(&idev->lock);
678 out2:
679 rcu_read_unlock_bh();
680
681 if (likely(err == 0))
682 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
683 else {
684 kfree(ifa);
685 ifa = ERR_PTR(err);
686 }
687
688 return ifa;
689 out:
690 spin_unlock(&addrconf_hash_lock);
691 goto out2;
692 }
693
694 /* This function wants to get referenced ifp and releases it before return */
695
696 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
697 {
698 struct inet6_ifaddr *ifa, *ifn;
699 struct inet6_dev *idev = ifp->idev;
700 int state;
701 int deleted = 0, onlink = 0;
702 unsigned long expires = jiffies;
703
704 spin_lock_bh(&ifp->state_lock);
705 state = ifp->state;
706 ifp->state = INET6_IFADDR_STATE_DEAD;
707 spin_unlock_bh(&ifp->state_lock);
708
709 if (state == INET6_IFADDR_STATE_DEAD)
710 goto out;
711
712 spin_lock_bh(&addrconf_hash_lock);
713 hlist_del_init_rcu(&ifp->addr_lst);
714 spin_unlock_bh(&addrconf_hash_lock);
715
716 write_lock_bh(&idev->lock);
717 #ifdef CONFIG_IPV6_PRIVACY
718 if (ifp->flags&IFA_F_TEMPORARY) {
719 list_del(&ifp->tmp_list);
720 if (ifp->ifpub) {
721 in6_ifa_put(ifp->ifpub);
722 ifp->ifpub = NULL;
723 }
724 __in6_ifa_put(ifp);
725 }
726 #endif
727
728 list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) {
729 if (ifa == ifp) {
730 list_del_init(&ifp->if_list);
731 __in6_ifa_put(ifp);
732
733 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
734 break;
735 deleted = 1;
736 continue;
737 } else if (ifp->flags & IFA_F_PERMANENT) {
738 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
739 ifp->prefix_len)) {
740 if (ifa->flags & IFA_F_PERMANENT) {
741 onlink = 1;
742 if (deleted)
743 break;
744 } else {
745 unsigned long lifetime;
746
747 if (!onlink)
748 onlink = -1;
749
750 spin_lock(&ifa->lock);
751
752 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
753 /*
754 * Note: Because this address is
755 * not permanent, lifetime <
756 * LONG_MAX / HZ here.
757 */
758 if (time_before(expires,
759 ifa->tstamp + lifetime * HZ))
760 expires = ifa->tstamp + lifetime * HZ;
761 spin_unlock(&ifa->lock);
762 }
763 }
764 }
765 }
766 write_unlock_bh(&idev->lock);
767
768 addrconf_del_timer(ifp);
769
770 ipv6_ifa_notify(RTM_DELADDR, ifp);
771
772 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
773
774 /*
775 * Purge or update corresponding prefix
776 *
777 * 1) we don't purge prefix here if address was not permanent.
778 * prefix is managed by its own lifetime.
779 * 2) if there're no addresses, delete prefix.
780 * 3) if there're still other permanent address(es),
781 * corresponding prefix is still permanent.
782 * 4) otherwise, update prefix lifetime to the
783 * longest valid lifetime among the corresponding
784 * addresses on the device.
785 * Note: subsequent RA will update lifetime.
786 *
787 * --yoshfuji
788 */
789 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
790 struct in6_addr prefix;
791 struct rt6_info *rt;
792 struct net *net = dev_net(ifp->idev->dev);
793 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
794 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1);
795
796 if (rt && addrconf_is_prefix_route(rt)) {
797 if (onlink == 0) {
798 ip6_del_rt(rt);
799 rt = NULL;
800 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
801 rt6_set_expires(rt, expires);
802 }
803 }
804 dst_release(&rt->dst);
805 }
806
807 /* clean up prefsrc entries */
808 rt6_remove_prefsrc(ifp);
809 out:
810 in6_ifa_put(ifp);
811 }
812
813 #ifdef CONFIG_IPV6_PRIVACY
814 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
815 {
816 struct inet6_dev *idev = ifp->idev;
817 struct in6_addr addr, *tmpaddr;
818 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
819 unsigned long regen_advance;
820 int tmp_plen;
821 int ret = 0;
822 int max_addresses;
823 u32 addr_flags;
824 unsigned long now = jiffies;
825
826 write_lock(&idev->lock);
827 if (ift) {
828 spin_lock_bh(&ift->lock);
829 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
830 spin_unlock_bh(&ift->lock);
831 tmpaddr = &addr;
832 } else {
833 tmpaddr = NULL;
834 }
835 retry:
836 in6_dev_hold(idev);
837 if (idev->cnf.use_tempaddr <= 0) {
838 write_unlock(&idev->lock);
839 pr_info("%s: use_tempaddr is disabled\n", __func__);
840 in6_dev_put(idev);
841 ret = -1;
842 goto out;
843 }
844 spin_lock_bh(&ifp->lock);
845 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
846 idev->cnf.use_tempaddr = -1; /*XXX*/
847 spin_unlock_bh(&ifp->lock);
848 write_unlock(&idev->lock);
849 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
850 __func__);
851 in6_dev_put(idev);
852 ret = -1;
853 goto out;
854 }
855 in6_ifa_hold(ifp);
856 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
857 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
858 spin_unlock_bh(&ifp->lock);
859 write_unlock(&idev->lock);
860 pr_warn("%s: regeneration of randomized interface id failed\n",
861 __func__);
862 in6_ifa_put(ifp);
863 in6_dev_put(idev);
864 ret = -1;
865 goto out;
866 }
867 memcpy(&addr.s6_addr[8], idev->rndid, 8);
868 age = (now - ifp->tstamp) / HZ;
869 tmp_valid_lft = min_t(__u32,
870 ifp->valid_lft,
871 idev->cnf.temp_valid_lft + age);
872 tmp_prefered_lft = min_t(__u32,
873 ifp->prefered_lft,
874 idev->cnf.temp_prefered_lft + age -
875 idev->cnf.max_desync_factor);
876 tmp_plen = ifp->prefix_len;
877 max_addresses = idev->cnf.max_addresses;
878 tmp_tstamp = ifp->tstamp;
879 spin_unlock_bh(&ifp->lock);
880
881 regen_advance = idev->cnf.regen_max_retry *
882 idev->cnf.dad_transmits *
883 idev->nd_parms->retrans_time / HZ;
884 write_unlock(&idev->lock);
885
886 /* A temporary address is created only if this calculated Preferred
887 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
888 * an implementation must not create a temporary address with a zero
889 * Preferred Lifetime.
890 */
891 if (tmp_prefered_lft <= regen_advance) {
892 in6_ifa_put(ifp);
893 in6_dev_put(idev);
894 ret = -1;
895 goto out;
896 }
897
898 addr_flags = IFA_F_TEMPORARY;
899 /* set in addrconf_prefix_rcv() */
900 if (ifp->flags & IFA_F_OPTIMISTIC)
901 addr_flags |= IFA_F_OPTIMISTIC;
902
903 ift = !max_addresses ||
904 ipv6_count_addresses(idev) < max_addresses ?
905 ipv6_add_addr(idev, &addr, tmp_plen,
906 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
907 addr_flags) : NULL;
908 if (!ift || IS_ERR(ift)) {
909 in6_ifa_put(ifp);
910 in6_dev_put(idev);
911 pr_info("%s: retry temporary address regeneration\n", __func__);
912 tmpaddr = &addr;
913 write_lock(&idev->lock);
914 goto retry;
915 }
916
917 spin_lock_bh(&ift->lock);
918 ift->ifpub = ifp;
919 ift->valid_lft = tmp_valid_lft;
920 ift->prefered_lft = tmp_prefered_lft;
921 ift->cstamp = now;
922 ift->tstamp = tmp_tstamp;
923 spin_unlock_bh(&ift->lock);
924
925 addrconf_dad_start(ift);
926 in6_ifa_put(ift);
927 in6_dev_put(idev);
928 out:
929 return ret;
930 }
931 #endif
932
933 /*
934 * Choose an appropriate source address (RFC3484)
935 */
936 enum {
937 IPV6_SADDR_RULE_INIT = 0,
938 IPV6_SADDR_RULE_LOCAL,
939 IPV6_SADDR_RULE_SCOPE,
940 IPV6_SADDR_RULE_PREFERRED,
941 #ifdef CONFIG_IPV6_MIP6
942 IPV6_SADDR_RULE_HOA,
943 #endif
944 IPV6_SADDR_RULE_OIF,
945 IPV6_SADDR_RULE_LABEL,
946 #ifdef CONFIG_IPV6_PRIVACY
947 IPV6_SADDR_RULE_PRIVACY,
948 #endif
949 IPV6_SADDR_RULE_ORCHID,
950 IPV6_SADDR_RULE_PREFIX,
951 IPV6_SADDR_RULE_MAX
952 };
953
954 struct ipv6_saddr_score {
955 int rule;
956 int addr_type;
957 struct inet6_ifaddr *ifa;
958 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
959 int scopedist;
960 int matchlen;
961 };
962
963 struct ipv6_saddr_dst {
964 const struct in6_addr *addr;
965 int ifindex;
966 int scope;
967 int label;
968 unsigned int prefs;
969 };
970
971 static inline int ipv6_saddr_preferred(int type)
972 {
973 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
974 return 1;
975 return 0;
976 }
977
978 static int ipv6_get_saddr_eval(struct net *net,
979 struct ipv6_saddr_score *score,
980 struct ipv6_saddr_dst *dst,
981 int i)
982 {
983 int ret;
984
985 if (i <= score->rule) {
986 switch (i) {
987 case IPV6_SADDR_RULE_SCOPE:
988 ret = score->scopedist;
989 break;
990 case IPV6_SADDR_RULE_PREFIX:
991 ret = score->matchlen;
992 break;
993 default:
994 ret = !!test_bit(i, score->scorebits);
995 }
996 goto out;
997 }
998
999 switch (i) {
1000 case IPV6_SADDR_RULE_INIT:
1001 /* Rule 0: remember if hiscore is not ready yet */
1002 ret = !!score->ifa;
1003 break;
1004 case IPV6_SADDR_RULE_LOCAL:
1005 /* Rule 1: Prefer same address */
1006 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1007 break;
1008 case IPV6_SADDR_RULE_SCOPE:
1009 /* Rule 2: Prefer appropriate scope
1010 *
1011 * ret
1012 * ^
1013 * -1 | d 15
1014 * ---+--+-+---> scope
1015 * |
1016 * | d is scope of the destination.
1017 * B-d | \
1018 * | \ <- smaller scope is better if
1019 * B-15 | \ if scope is enough for destinaion.
1020 * | ret = B - scope (-1 <= scope >= d <= 15).
1021 * d-C-1 | /
1022 * |/ <- greater is better
1023 * -C / if scope is not enough for destination.
1024 * /| ret = scope - C (-1 <= d < scope <= 15).
1025 *
1026 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1027 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1028 * Assume B = 0 and we get C > 29.
1029 */
1030 ret = __ipv6_addr_src_scope(score->addr_type);
1031 if (ret >= dst->scope)
1032 ret = -ret;
1033 else
1034 ret -= 128; /* 30 is enough */
1035 score->scopedist = ret;
1036 break;
1037 case IPV6_SADDR_RULE_PREFERRED:
1038 /* Rule 3: Avoid deprecated and optimistic addresses */
1039 ret = ipv6_saddr_preferred(score->addr_type) ||
1040 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1041 break;
1042 #ifdef CONFIG_IPV6_MIP6
1043 case IPV6_SADDR_RULE_HOA:
1044 {
1045 /* Rule 4: Prefer home address */
1046 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1047 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1048 break;
1049 }
1050 #endif
1051 case IPV6_SADDR_RULE_OIF:
1052 /* Rule 5: Prefer outgoing interface */
1053 ret = (!dst->ifindex ||
1054 dst->ifindex == score->ifa->idev->dev->ifindex);
1055 break;
1056 case IPV6_SADDR_RULE_LABEL:
1057 /* Rule 6: Prefer matching label */
1058 ret = ipv6_addr_label(net,
1059 &score->ifa->addr, score->addr_type,
1060 score->ifa->idev->dev->ifindex) == dst->label;
1061 break;
1062 #ifdef CONFIG_IPV6_PRIVACY
1063 case IPV6_SADDR_RULE_PRIVACY:
1064 {
1065 /* Rule 7: Prefer public address
1066 * Note: prefer temporary address if use_tempaddr >= 2
1067 */
1068 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1069 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1070 score->ifa->idev->cnf.use_tempaddr >= 2;
1071 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1072 break;
1073 }
1074 #endif
1075 case IPV6_SADDR_RULE_ORCHID:
1076 /* Rule 8-: Prefer ORCHID vs ORCHID or
1077 * non-ORCHID vs non-ORCHID
1078 */
1079 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1080 ipv6_addr_orchid(dst->addr));
1081 break;
1082 case IPV6_SADDR_RULE_PREFIX:
1083 /* Rule 8: Use longest matching prefix */
1084 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr,
1085 dst->addr);
1086 break;
1087 default:
1088 ret = 0;
1089 }
1090
1091 if (ret)
1092 __set_bit(i, score->scorebits);
1093 score->rule = i;
1094 out:
1095 return ret;
1096 }
1097
1098 int ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev,
1099 const struct in6_addr *daddr, unsigned int prefs,
1100 struct in6_addr *saddr)
1101 {
1102 struct ipv6_saddr_score scores[2],
1103 *score = &scores[0], *hiscore = &scores[1];
1104 struct ipv6_saddr_dst dst;
1105 struct net_device *dev;
1106 int dst_type;
1107
1108 dst_type = __ipv6_addr_type(daddr);
1109 dst.addr = daddr;
1110 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1111 dst.scope = __ipv6_addr_src_scope(dst_type);
1112 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1113 dst.prefs = prefs;
1114
1115 hiscore->rule = -1;
1116 hiscore->ifa = NULL;
1117
1118 rcu_read_lock();
1119
1120 for_each_netdev_rcu(net, dev) {
1121 struct inet6_dev *idev;
1122
1123 /* Candidate Source Address (section 4)
1124 * - multicast and link-local destination address,
1125 * the set of candidate source address MUST only
1126 * include addresses assigned to interfaces
1127 * belonging to the same link as the outgoing
1128 * interface.
1129 * (- For site-local destination addresses, the
1130 * set of candidate source addresses MUST only
1131 * include addresses assigned to interfaces
1132 * belonging to the same site as the outgoing
1133 * interface.)
1134 */
1135 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1136 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1137 dst.ifindex && dev->ifindex != dst.ifindex)
1138 continue;
1139
1140 idev = __in6_dev_get(dev);
1141 if (!idev)
1142 continue;
1143
1144 read_lock_bh(&idev->lock);
1145 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1146 int i;
1147
1148 /*
1149 * - Tentative Address (RFC2462 section 5.4)
1150 * - A tentative address is not considered
1151 * "assigned to an interface" in the traditional
1152 * sense, unless it is also flagged as optimistic.
1153 * - Candidate Source Address (section 4)
1154 * - In any case, anycast addresses, multicast
1155 * addresses, and the unspecified address MUST
1156 * NOT be included in a candidate set.
1157 */
1158 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1159 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1160 continue;
1161
1162 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1163
1164 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1165 score->addr_type & IPV6_ADDR_MULTICAST)) {
1166 LIMIT_NETDEBUG(KERN_DEBUG
1167 "ADDRCONF: unspecified / multicast address "
1168 "assigned as unicast address on %s",
1169 dev->name);
1170 continue;
1171 }
1172
1173 score->rule = -1;
1174 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1175
1176 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1177 int minihiscore, miniscore;
1178
1179 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1180 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1181
1182 if (minihiscore > miniscore) {
1183 if (i == IPV6_SADDR_RULE_SCOPE &&
1184 score->scopedist > 0) {
1185 /*
1186 * special case:
1187 * each remaining entry
1188 * has too small (not enough)
1189 * scope, because ifa entries
1190 * are sorted by their scope
1191 * values.
1192 */
1193 goto try_nextdev;
1194 }
1195 break;
1196 } else if (minihiscore < miniscore) {
1197 if (hiscore->ifa)
1198 in6_ifa_put(hiscore->ifa);
1199
1200 in6_ifa_hold(score->ifa);
1201
1202 swap(hiscore, score);
1203
1204 /* restore our iterator */
1205 score->ifa = hiscore->ifa;
1206
1207 break;
1208 }
1209 }
1210 }
1211 try_nextdev:
1212 read_unlock_bh(&idev->lock);
1213 }
1214 rcu_read_unlock();
1215
1216 if (!hiscore->ifa)
1217 return -EADDRNOTAVAIL;
1218
1219 *saddr = hiscore->ifa->addr;
1220 in6_ifa_put(hiscore->ifa);
1221 return 0;
1222 }
1223 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1224
1225 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1226 unsigned char banned_flags)
1227 {
1228 struct inet6_dev *idev;
1229 int err = -EADDRNOTAVAIL;
1230
1231 rcu_read_lock();
1232 idev = __in6_dev_get(dev);
1233 if (idev) {
1234 struct inet6_ifaddr *ifp;
1235
1236 read_lock_bh(&idev->lock);
1237 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1238 if (ifp->scope == IFA_LINK &&
1239 !(ifp->flags & banned_flags)) {
1240 *addr = ifp->addr;
1241 err = 0;
1242 break;
1243 }
1244 }
1245 read_unlock_bh(&idev->lock);
1246 }
1247 rcu_read_unlock();
1248 return err;
1249 }
1250
1251 static int ipv6_count_addresses(struct inet6_dev *idev)
1252 {
1253 int cnt = 0;
1254 struct inet6_ifaddr *ifp;
1255
1256 read_lock_bh(&idev->lock);
1257 list_for_each_entry(ifp, &idev->addr_list, if_list)
1258 cnt++;
1259 read_unlock_bh(&idev->lock);
1260 return cnt;
1261 }
1262
1263 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1264 struct net_device *dev, int strict)
1265 {
1266 struct inet6_ifaddr *ifp;
1267 struct hlist_node *node;
1268 unsigned int hash = inet6_addr_hash(addr);
1269
1270 rcu_read_lock_bh();
1271 hlist_for_each_entry_rcu(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1272 if (!net_eq(dev_net(ifp->idev->dev), net))
1273 continue;
1274 if (ipv6_addr_equal(&ifp->addr, addr) &&
1275 !(ifp->flags&IFA_F_TENTATIVE) &&
1276 (dev == NULL || ifp->idev->dev == dev ||
1277 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1278 rcu_read_unlock_bh();
1279 return 1;
1280 }
1281 }
1282
1283 rcu_read_unlock_bh();
1284 return 0;
1285 }
1286 EXPORT_SYMBOL(ipv6_chk_addr);
1287
1288 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1289 struct net_device *dev)
1290 {
1291 unsigned int hash = inet6_addr_hash(addr);
1292 struct inet6_ifaddr *ifp;
1293 struct hlist_node *node;
1294
1295 hlist_for_each_entry(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1296 if (!net_eq(dev_net(ifp->idev->dev), net))
1297 continue;
1298 if (ipv6_addr_equal(&ifp->addr, addr)) {
1299 if (dev == NULL || ifp->idev->dev == dev)
1300 return true;
1301 }
1302 }
1303 return false;
1304 }
1305
1306 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1307 {
1308 struct inet6_dev *idev;
1309 struct inet6_ifaddr *ifa;
1310 int onlink;
1311
1312 onlink = 0;
1313 rcu_read_lock();
1314 idev = __in6_dev_get(dev);
1315 if (idev) {
1316 read_lock_bh(&idev->lock);
1317 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1318 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1319 ifa->prefix_len);
1320 if (onlink)
1321 break;
1322 }
1323 read_unlock_bh(&idev->lock);
1324 }
1325 rcu_read_unlock();
1326 return onlink;
1327 }
1328 EXPORT_SYMBOL(ipv6_chk_prefix);
1329
1330 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1331 struct net_device *dev, int strict)
1332 {
1333 struct inet6_ifaddr *ifp, *result = NULL;
1334 unsigned int hash = inet6_addr_hash(addr);
1335 struct hlist_node *node;
1336
1337 rcu_read_lock_bh();
1338 hlist_for_each_entry_rcu_bh(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1339 if (!net_eq(dev_net(ifp->idev->dev), net))
1340 continue;
1341 if (ipv6_addr_equal(&ifp->addr, addr)) {
1342 if (dev == NULL || ifp->idev->dev == dev ||
1343 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1344 result = ifp;
1345 in6_ifa_hold(ifp);
1346 break;
1347 }
1348 }
1349 }
1350 rcu_read_unlock_bh();
1351
1352 return result;
1353 }
1354
1355 /* Gets referenced address, destroys ifaddr */
1356
1357 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1358 {
1359 if (ifp->flags&IFA_F_PERMANENT) {
1360 spin_lock_bh(&ifp->lock);
1361 addrconf_del_timer(ifp);
1362 ifp->flags |= IFA_F_TENTATIVE;
1363 if (dad_failed)
1364 ifp->flags |= IFA_F_DADFAILED;
1365 spin_unlock_bh(&ifp->lock);
1366 if (dad_failed)
1367 ipv6_ifa_notify(0, ifp);
1368 in6_ifa_put(ifp);
1369 #ifdef CONFIG_IPV6_PRIVACY
1370 } else if (ifp->flags&IFA_F_TEMPORARY) {
1371 struct inet6_ifaddr *ifpub;
1372 spin_lock_bh(&ifp->lock);
1373 ifpub = ifp->ifpub;
1374 if (ifpub) {
1375 in6_ifa_hold(ifpub);
1376 spin_unlock_bh(&ifp->lock);
1377 ipv6_create_tempaddr(ifpub, ifp);
1378 in6_ifa_put(ifpub);
1379 } else {
1380 spin_unlock_bh(&ifp->lock);
1381 }
1382 ipv6_del_addr(ifp);
1383 #endif
1384 } else
1385 ipv6_del_addr(ifp);
1386 }
1387
1388 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1389 {
1390 int err = -ENOENT;
1391
1392 spin_lock(&ifp->state_lock);
1393 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1394 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1395 err = 0;
1396 }
1397 spin_unlock(&ifp->state_lock);
1398
1399 return err;
1400 }
1401
1402 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1403 {
1404 struct inet6_dev *idev = ifp->idev;
1405
1406 if (addrconf_dad_end(ifp)) {
1407 in6_ifa_put(ifp);
1408 return;
1409 }
1410
1411 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1412 ifp->idev->dev->name, &ifp->addr);
1413
1414 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1415 struct in6_addr addr;
1416
1417 addr.s6_addr32[0] = htonl(0xfe800000);
1418 addr.s6_addr32[1] = 0;
1419
1420 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1421 ipv6_addr_equal(&ifp->addr, &addr)) {
1422 /* DAD failed for link-local based on MAC address */
1423 idev->cnf.disable_ipv6 = 1;
1424
1425 pr_info("%s: IPv6 being disabled!\n",
1426 ifp->idev->dev->name);
1427 }
1428 }
1429
1430 addrconf_dad_stop(ifp, 1);
1431 }
1432
1433 /* Join to solicited addr multicast group. */
1434
1435 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1436 {
1437 struct in6_addr maddr;
1438
1439 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1440 return;
1441
1442 addrconf_addr_solict_mult(addr, &maddr);
1443 ipv6_dev_mc_inc(dev, &maddr);
1444 }
1445
1446 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1447 {
1448 struct in6_addr maddr;
1449
1450 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1451 return;
1452
1453 addrconf_addr_solict_mult(addr, &maddr);
1454 __ipv6_dev_mc_dec(idev, &maddr);
1455 }
1456
1457 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1458 {
1459 struct in6_addr addr;
1460 if (ifp->prefix_len == 127) /* RFC 6164 */
1461 return;
1462 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1463 if (ipv6_addr_any(&addr))
1464 return;
1465 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1466 }
1467
1468 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1469 {
1470 struct in6_addr addr;
1471 if (ifp->prefix_len == 127) /* RFC 6164 */
1472 return;
1473 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1474 if (ipv6_addr_any(&addr))
1475 return;
1476 __ipv6_dev_ac_dec(ifp->idev, &addr);
1477 }
1478
1479 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1480 {
1481 if (dev->addr_len != ETH_ALEN)
1482 return -1;
1483 memcpy(eui, dev->dev_addr, 3);
1484 memcpy(eui + 5, dev->dev_addr + 3, 3);
1485
1486 /*
1487 * The zSeries OSA network cards can be shared among various
1488 * OS instances, but the OSA cards have only one MAC address.
1489 * This leads to duplicate address conflicts in conjunction
1490 * with IPv6 if more than one instance uses the same card.
1491 *
1492 * The driver for these cards can deliver a unique 16-bit
1493 * identifier for each instance sharing the same card. It is
1494 * placed instead of 0xFFFE in the interface identifier. The
1495 * "u" bit of the interface identifier is not inverted in this
1496 * case. Hence the resulting interface identifier has local
1497 * scope according to RFC2373.
1498 */
1499 if (dev->dev_id) {
1500 eui[3] = (dev->dev_id >> 8) & 0xFF;
1501 eui[4] = dev->dev_id & 0xFF;
1502 } else {
1503 eui[3] = 0xFF;
1504 eui[4] = 0xFE;
1505 eui[0] ^= 2;
1506 }
1507 return 0;
1508 }
1509
1510 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1511 {
1512 if (dev->addr_len != IEEE802154_ADDR_LEN)
1513 return -1;
1514 memcpy(eui, dev->dev_addr, 8);
1515 return 0;
1516 }
1517
1518 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1519 {
1520 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1521 if (dev->addr_len != ARCNET_ALEN)
1522 return -1;
1523 memset(eui, 0, 7);
1524 eui[7] = *(u8 *)dev->dev_addr;
1525 return 0;
1526 }
1527
1528 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1529 {
1530 if (dev->addr_len != INFINIBAND_ALEN)
1531 return -1;
1532 memcpy(eui, dev->dev_addr + 12, 8);
1533 eui[0] |= 2;
1534 return 0;
1535 }
1536
1537 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1538 {
1539 if (addr == 0)
1540 return -1;
1541 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1542 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1543 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1544 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1545 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1546 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1547 eui[1] = 0;
1548 eui[2] = 0x5E;
1549 eui[3] = 0xFE;
1550 memcpy(eui + 4, &addr, 4);
1551 return 0;
1552 }
1553
1554 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1555 {
1556 if (dev->priv_flags & IFF_ISATAP)
1557 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1558 return -1;
1559 }
1560
1561 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
1562 {
1563 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1564 }
1565
1566 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1567 {
1568 switch (dev->type) {
1569 case ARPHRD_ETHER:
1570 case ARPHRD_FDDI:
1571 return addrconf_ifid_eui48(eui, dev);
1572 case ARPHRD_ARCNET:
1573 return addrconf_ifid_arcnet(eui, dev);
1574 case ARPHRD_INFINIBAND:
1575 return addrconf_ifid_infiniband(eui, dev);
1576 case ARPHRD_SIT:
1577 return addrconf_ifid_sit(eui, dev);
1578 case ARPHRD_IPGRE:
1579 return addrconf_ifid_gre(eui, dev);
1580 case ARPHRD_IEEE802154:
1581 return addrconf_ifid_eui64(eui, dev);
1582 }
1583 return -1;
1584 }
1585
1586 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1587 {
1588 int err = -1;
1589 struct inet6_ifaddr *ifp;
1590
1591 read_lock_bh(&idev->lock);
1592 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1593 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1594 memcpy(eui, ifp->addr.s6_addr+8, 8);
1595 err = 0;
1596 break;
1597 }
1598 }
1599 read_unlock_bh(&idev->lock);
1600 return err;
1601 }
1602
1603 #ifdef CONFIG_IPV6_PRIVACY
1604 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1605 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1606 {
1607 regen:
1608 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1609 idev->rndid[0] &= ~0x02;
1610
1611 /*
1612 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1613 * check if generated address is not inappropriate
1614 *
1615 * - Reserved subnet anycast (RFC 2526)
1616 * 11111101 11....11 1xxxxxxx
1617 * - ISATAP (RFC4214) 6.1
1618 * 00-00-5E-FE-xx-xx-xx-xx
1619 * - value 0
1620 * - XXX: already assigned to an address on the device
1621 */
1622 if (idev->rndid[0] == 0xfd &&
1623 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1624 (idev->rndid[7]&0x80))
1625 goto regen;
1626 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1627 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1628 goto regen;
1629 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1630 goto regen;
1631 }
1632
1633 return 0;
1634 }
1635
1636 static void ipv6_regen_rndid(unsigned long data)
1637 {
1638 struct inet6_dev *idev = (struct inet6_dev *) data;
1639 unsigned long expires;
1640
1641 rcu_read_lock_bh();
1642 write_lock_bh(&idev->lock);
1643
1644 if (idev->dead)
1645 goto out;
1646
1647 if (__ipv6_regen_rndid(idev) < 0)
1648 goto out;
1649
1650 expires = jiffies +
1651 idev->cnf.temp_prefered_lft * HZ -
1652 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time -
1653 idev->cnf.max_desync_factor * HZ;
1654 if (time_before(expires, jiffies)) {
1655 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
1656 __func__, idev->dev->name);
1657 goto out;
1658 }
1659
1660 if (!mod_timer(&idev->regen_timer, expires))
1661 in6_dev_hold(idev);
1662
1663 out:
1664 write_unlock_bh(&idev->lock);
1665 rcu_read_unlock_bh();
1666 in6_dev_put(idev);
1667 }
1668
1669 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
1670 {
1671 int ret = 0;
1672
1673 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1674 ret = __ipv6_regen_rndid(idev);
1675 return ret;
1676 }
1677 #endif
1678
1679 /*
1680 * Add prefix route.
1681 */
1682
1683 static void
1684 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1685 unsigned long expires, u32 flags)
1686 {
1687 struct fib6_config cfg = {
1688 .fc_table = RT6_TABLE_PREFIX,
1689 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1690 .fc_ifindex = dev->ifindex,
1691 .fc_expires = expires,
1692 .fc_dst_len = plen,
1693 .fc_flags = RTF_UP | flags,
1694 .fc_nlinfo.nl_net = dev_net(dev),
1695 .fc_protocol = RTPROT_KERNEL,
1696 };
1697
1698 cfg.fc_dst = *pfx;
1699
1700 /* Prevent useless cloning on PtP SIT.
1701 This thing is done here expecting that the whole
1702 class of non-broadcast devices need not cloning.
1703 */
1704 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1705 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1706 cfg.fc_flags |= RTF_NONEXTHOP;
1707 #endif
1708
1709 ip6_route_add(&cfg);
1710 }
1711
1712
1713 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
1714 int plen,
1715 const struct net_device *dev,
1716 u32 flags, u32 noflags)
1717 {
1718 struct fib6_node *fn;
1719 struct rt6_info *rt = NULL;
1720 struct fib6_table *table;
1721
1722 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX);
1723 if (table == NULL)
1724 return NULL;
1725
1726 write_lock_bh(&table->tb6_lock);
1727 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
1728 if (!fn)
1729 goto out;
1730 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1731 if (rt->dst.dev->ifindex != dev->ifindex)
1732 continue;
1733 if ((rt->rt6i_flags & flags) != flags)
1734 continue;
1735 if ((noflags != 0) && ((rt->rt6i_flags & flags) != 0))
1736 continue;
1737 dst_hold(&rt->dst);
1738 break;
1739 }
1740 out:
1741 write_unlock_bh(&table->tb6_lock);
1742 return rt;
1743 }
1744
1745
1746 /* Create "default" multicast route to the interface */
1747
1748 static void addrconf_add_mroute(struct net_device *dev)
1749 {
1750 struct fib6_config cfg = {
1751 .fc_table = RT6_TABLE_LOCAL,
1752 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1753 .fc_ifindex = dev->ifindex,
1754 .fc_dst_len = 8,
1755 .fc_flags = RTF_UP,
1756 .fc_nlinfo.nl_net = dev_net(dev),
1757 };
1758
1759 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1760
1761 ip6_route_add(&cfg);
1762 }
1763
1764 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1765 static void sit_route_add(struct net_device *dev)
1766 {
1767 struct fib6_config cfg = {
1768 .fc_table = RT6_TABLE_MAIN,
1769 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1770 .fc_ifindex = dev->ifindex,
1771 .fc_dst_len = 96,
1772 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1773 .fc_nlinfo.nl_net = dev_net(dev),
1774 };
1775
1776 /* prefix length - 96 bits "::d.d.d.d" */
1777 ip6_route_add(&cfg);
1778 }
1779 #endif
1780
1781 static void addrconf_add_lroute(struct net_device *dev)
1782 {
1783 struct in6_addr addr;
1784
1785 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1786 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1787 }
1788
1789 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1790 {
1791 struct inet6_dev *idev;
1792
1793 ASSERT_RTNL();
1794
1795 idev = ipv6_find_idev(dev);
1796 if (!idev)
1797 return ERR_PTR(-ENOBUFS);
1798
1799 if (idev->cnf.disable_ipv6)
1800 return ERR_PTR(-EACCES);
1801
1802 /* Add default multicast route */
1803 if (!(dev->flags & IFF_LOOPBACK))
1804 addrconf_add_mroute(dev);
1805
1806 /* Add link local route */
1807 addrconf_add_lroute(dev);
1808 return idev;
1809 }
1810
1811 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
1812 {
1813 struct prefix_info *pinfo;
1814 __u32 valid_lft;
1815 __u32 prefered_lft;
1816 int addr_type;
1817 struct inet6_dev *in6_dev;
1818 struct net *net = dev_net(dev);
1819
1820 pinfo = (struct prefix_info *) opt;
1821
1822 if (len < sizeof(struct prefix_info)) {
1823 ADBG(("addrconf: prefix option too short\n"));
1824 return;
1825 }
1826
1827 /*
1828 * Validation checks ([ADDRCONF], page 19)
1829 */
1830
1831 addr_type = ipv6_addr_type(&pinfo->prefix);
1832
1833 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1834 return;
1835
1836 valid_lft = ntohl(pinfo->valid);
1837 prefered_lft = ntohl(pinfo->prefered);
1838
1839 if (prefered_lft > valid_lft) {
1840 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
1841 return;
1842 }
1843
1844 in6_dev = in6_dev_get(dev);
1845
1846 if (in6_dev == NULL) {
1847 net_dbg_ratelimited("addrconf: device %s not configured\n",
1848 dev->name);
1849 return;
1850 }
1851
1852 /*
1853 * Two things going on here:
1854 * 1) Add routes for on-link prefixes
1855 * 2) Configure prefixes with the auto flag set
1856 */
1857
1858 if (pinfo->onlink) {
1859 struct rt6_info *rt;
1860 unsigned long rt_expires;
1861
1862 /* Avoid arithmetic overflow. Really, we could
1863 * save rt_expires in seconds, likely valid_lft,
1864 * but it would require division in fib gc, that it
1865 * not good.
1866 */
1867 if (HZ > USER_HZ)
1868 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
1869 else
1870 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
1871
1872 if (addrconf_finite_timeout(rt_expires))
1873 rt_expires *= HZ;
1874
1875 rt = addrconf_get_prefix_route(&pinfo->prefix,
1876 pinfo->prefix_len,
1877 dev,
1878 RTF_ADDRCONF | RTF_PREFIX_RT,
1879 RTF_GATEWAY | RTF_DEFAULT);
1880
1881 if (rt) {
1882 /* Autoconf prefix route */
1883 if (valid_lft == 0) {
1884 ip6_del_rt(rt);
1885 rt = NULL;
1886 } else if (addrconf_finite_timeout(rt_expires)) {
1887 /* not infinity */
1888 rt6_set_expires(rt, jiffies + rt_expires);
1889 } else {
1890 rt6_clean_expires(rt);
1891 }
1892 } else if (valid_lft) {
1893 clock_t expires = 0;
1894 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
1895 if (addrconf_finite_timeout(rt_expires)) {
1896 /* not infinity */
1897 flags |= RTF_EXPIRES;
1898 expires = jiffies_to_clock_t(rt_expires);
1899 }
1900 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1901 dev, expires, flags);
1902 }
1903 if (rt)
1904 dst_release(&rt->dst);
1905 }
1906
1907 /* Try to figure out our local address for this prefix */
1908
1909 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1910 struct inet6_ifaddr *ifp;
1911 struct in6_addr addr;
1912 int create = 0, update_lft = 0;
1913
1914 if (pinfo->prefix_len == 64) {
1915 memcpy(&addr, &pinfo->prefix, 8);
1916 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1917 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1918 in6_dev_put(in6_dev);
1919 return;
1920 }
1921 goto ok;
1922 }
1923 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
1924 pinfo->prefix_len);
1925 in6_dev_put(in6_dev);
1926 return;
1927
1928 ok:
1929
1930 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1931
1932 if (ifp == NULL && valid_lft) {
1933 int max_addresses = in6_dev->cnf.max_addresses;
1934 u32 addr_flags = 0;
1935
1936 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1937 if (in6_dev->cnf.optimistic_dad &&
1938 !net->ipv6.devconf_all->forwarding && sllao)
1939 addr_flags = IFA_F_OPTIMISTIC;
1940 #endif
1941
1942 /* Do not allow to create too much of autoconfigured
1943 * addresses; this would be too easy way to crash kernel.
1944 */
1945 if (!max_addresses ||
1946 ipv6_count_addresses(in6_dev) < max_addresses)
1947 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1948 addr_type&IPV6_ADDR_SCOPE_MASK,
1949 addr_flags);
1950
1951 if (!ifp || IS_ERR(ifp)) {
1952 in6_dev_put(in6_dev);
1953 return;
1954 }
1955
1956 update_lft = create = 1;
1957 ifp->cstamp = jiffies;
1958 addrconf_dad_start(ifp);
1959 }
1960
1961 if (ifp) {
1962 int flags;
1963 unsigned long now;
1964 #ifdef CONFIG_IPV6_PRIVACY
1965 struct inet6_ifaddr *ift;
1966 #endif
1967 u32 stored_lft;
1968
1969 /* update lifetime (RFC2462 5.5.3 e) */
1970 spin_lock(&ifp->lock);
1971 now = jiffies;
1972 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1973 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1974 else
1975 stored_lft = 0;
1976 if (!update_lft && stored_lft) {
1977 if (valid_lft > MIN_VALID_LIFETIME ||
1978 valid_lft > stored_lft)
1979 update_lft = 1;
1980 else if (stored_lft <= MIN_VALID_LIFETIME) {
1981 /* valid_lft <= stored_lft is always true */
1982 /*
1983 * RFC 4862 Section 5.5.3e:
1984 * "Note that the preferred lifetime of
1985 * the corresponding address is always
1986 * reset to the Preferred Lifetime in
1987 * the received Prefix Information
1988 * option, regardless of whether the
1989 * valid lifetime is also reset or
1990 * ignored."
1991 *
1992 * So if the preferred lifetime in
1993 * this advertisement is different
1994 * than what we have stored, but the
1995 * valid lifetime is invalid, just
1996 * reset prefered_lft.
1997 *
1998 * We must set the valid lifetime
1999 * to the stored lifetime since we'll
2000 * be updating the timestamp below,
2001 * else we'll set it back to the
2002 * minimum.
2003 */
2004 if (prefered_lft != ifp->prefered_lft) {
2005 valid_lft = stored_lft;
2006 update_lft = 1;
2007 }
2008 } else {
2009 valid_lft = MIN_VALID_LIFETIME;
2010 if (valid_lft < prefered_lft)
2011 prefered_lft = valid_lft;
2012 update_lft = 1;
2013 }
2014 }
2015
2016 if (update_lft) {
2017 ifp->valid_lft = valid_lft;
2018 ifp->prefered_lft = prefered_lft;
2019 ifp->tstamp = now;
2020 flags = ifp->flags;
2021 ifp->flags &= ~IFA_F_DEPRECATED;
2022 spin_unlock(&ifp->lock);
2023
2024 if (!(flags&IFA_F_TENTATIVE))
2025 ipv6_ifa_notify(0, ifp);
2026 } else
2027 spin_unlock(&ifp->lock);
2028
2029 #ifdef CONFIG_IPV6_PRIVACY
2030 read_lock_bh(&in6_dev->lock);
2031 /* update all temporary addresses in the list */
2032 list_for_each_entry(ift, &in6_dev->tempaddr_list,
2033 tmp_list) {
2034 int age, max_valid, max_prefered;
2035
2036 if (ifp != ift->ifpub)
2037 continue;
2038
2039 /*
2040 * RFC 4941 section 3.3:
2041 * If a received option will extend the lifetime
2042 * of a public address, the lifetimes of
2043 * temporary addresses should be extended,
2044 * subject to the overall constraint that no
2045 * temporary addresses should ever remain
2046 * "valid" or "preferred" for a time longer than
2047 * (TEMP_VALID_LIFETIME) or
2048 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR),
2049 * respectively.
2050 */
2051 age = (now - ift->cstamp) / HZ;
2052 max_valid = in6_dev->cnf.temp_valid_lft - age;
2053 if (max_valid < 0)
2054 max_valid = 0;
2055
2056 max_prefered = in6_dev->cnf.temp_prefered_lft -
2057 in6_dev->cnf.max_desync_factor -
2058 age;
2059 if (max_prefered < 0)
2060 max_prefered = 0;
2061
2062 if (valid_lft > max_valid)
2063 valid_lft = max_valid;
2064
2065 if (prefered_lft > max_prefered)
2066 prefered_lft = max_prefered;
2067
2068 spin_lock(&ift->lock);
2069 flags = ift->flags;
2070 ift->valid_lft = valid_lft;
2071 ift->prefered_lft = prefered_lft;
2072 ift->tstamp = now;
2073 if (prefered_lft > 0)
2074 ift->flags &= ~IFA_F_DEPRECATED;
2075
2076 spin_unlock(&ift->lock);
2077 if (!(flags&IFA_F_TENTATIVE))
2078 ipv6_ifa_notify(0, ift);
2079 }
2080
2081 if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) {
2082 /*
2083 * When a new public address is created as
2084 * described in [ADDRCONF], also create a new
2085 * temporary address. Also create a temporary
2086 * address if it's enabled but no temporary
2087 * address currently exists.
2088 */
2089 read_unlock_bh(&in6_dev->lock);
2090 ipv6_create_tempaddr(ifp, NULL);
2091 } else {
2092 read_unlock_bh(&in6_dev->lock);
2093 }
2094 #endif
2095 in6_ifa_put(ifp);
2096 addrconf_verify(0);
2097 }
2098 }
2099 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2100 in6_dev_put(in6_dev);
2101 }
2102
2103 /*
2104 * Set destination address.
2105 * Special case for SIT interfaces where we create a new "virtual"
2106 * device.
2107 */
2108 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2109 {
2110 struct in6_ifreq ireq;
2111 struct net_device *dev;
2112 int err = -EINVAL;
2113
2114 rtnl_lock();
2115
2116 err = -EFAULT;
2117 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2118 goto err_exit;
2119
2120 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2121
2122 err = -ENODEV;
2123 if (dev == NULL)
2124 goto err_exit;
2125
2126 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2127 if (dev->type == ARPHRD_SIT) {
2128 const struct net_device_ops *ops = dev->netdev_ops;
2129 struct ifreq ifr;
2130 struct ip_tunnel_parm p;
2131
2132 err = -EADDRNOTAVAIL;
2133 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2134 goto err_exit;
2135
2136 memset(&p, 0, sizeof(p));
2137 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2138 p.iph.saddr = 0;
2139 p.iph.version = 4;
2140 p.iph.ihl = 5;
2141 p.iph.protocol = IPPROTO_IPV6;
2142 p.iph.ttl = 64;
2143 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2144
2145 if (ops->ndo_do_ioctl) {
2146 mm_segment_t oldfs = get_fs();
2147
2148 set_fs(KERNEL_DS);
2149 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2150 set_fs(oldfs);
2151 } else
2152 err = -EOPNOTSUPP;
2153
2154 if (err == 0) {
2155 err = -ENOBUFS;
2156 dev = __dev_get_by_name(net, p.name);
2157 if (!dev)
2158 goto err_exit;
2159 err = dev_open(dev);
2160 }
2161 }
2162 #endif
2163
2164 err_exit:
2165 rtnl_unlock();
2166 return err;
2167 }
2168
2169 /*
2170 * Manual configuration of address on an interface
2171 */
2172 static int inet6_addr_add(struct net *net, int ifindex, const struct in6_addr *pfx,
2173 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
2174 __u32 valid_lft)
2175 {
2176 struct inet6_ifaddr *ifp;
2177 struct inet6_dev *idev;
2178 struct net_device *dev;
2179 int scope;
2180 u32 flags;
2181 clock_t expires;
2182 unsigned long timeout;
2183
2184 ASSERT_RTNL();
2185
2186 if (plen > 128)
2187 return -EINVAL;
2188
2189 /* check the lifetime */
2190 if (!valid_lft || prefered_lft > valid_lft)
2191 return -EINVAL;
2192
2193 dev = __dev_get_by_index(net, ifindex);
2194 if (!dev)
2195 return -ENODEV;
2196
2197 idev = addrconf_add_dev(dev);
2198 if (IS_ERR(idev))
2199 return PTR_ERR(idev);
2200
2201 scope = ipv6_addr_scope(pfx);
2202
2203 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2204 if (addrconf_finite_timeout(timeout)) {
2205 expires = jiffies_to_clock_t(timeout * HZ);
2206 valid_lft = timeout;
2207 flags = RTF_EXPIRES;
2208 } else {
2209 expires = 0;
2210 flags = 0;
2211 ifa_flags |= IFA_F_PERMANENT;
2212 }
2213
2214 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2215 if (addrconf_finite_timeout(timeout)) {
2216 if (timeout == 0)
2217 ifa_flags |= IFA_F_DEPRECATED;
2218 prefered_lft = timeout;
2219 }
2220
2221 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2222
2223 if (!IS_ERR(ifp)) {
2224 spin_lock_bh(&ifp->lock);
2225 ifp->valid_lft = valid_lft;
2226 ifp->prefered_lft = prefered_lft;
2227 ifp->tstamp = jiffies;
2228 spin_unlock_bh(&ifp->lock);
2229
2230 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2231 expires, flags);
2232 /*
2233 * Note that section 3.1 of RFC 4429 indicates
2234 * that the Optimistic flag should not be set for
2235 * manually configured addresses
2236 */
2237 addrconf_dad_start(ifp);
2238 in6_ifa_put(ifp);
2239 addrconf_verify(0);
2240 return 0;
2241 }
2242
2243 return PTR_ERR(ifp);
2244 }
2245
2246 static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx,
2247 unsigned int plen)
2248 {
2249 struct inet6_ifaddr *ifp;
2250 struct inet6_dev *idev;
2251 struct net_device *dev;
2252
2253 if (plen > 128)
2254 return -EINVAL;
2255
2256 dev = __dev_get_by_index(net, ifindex);
2257 if (!dev)
2258 return -ENODEV;
2259
2260 if ((idev = __in6_dev_get(dev)) == NULL)
2261 return -ENXIO;
2262
2263 read_lock_bh(&idev->lock);
2264 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2265 if (ifp->prefix_len == plen &&
2266 ipv6_addr_equal(pfx, &ifp->addr)) {
2267 in6_ifa_hold(ifp);
2268 read_unlock_bh(&idev->lock);
2269
2270 ipv6_del_addr(ifp);
2271
2272 /* If the last address is deleted administratively,
2273 disable IPv6 on this interface.
2274 */
2275 if (list_empty(&idev->addr_list))
2276 addrconf_ifdown(idev->dev, 1);
2277 return 0;
2278 }
2279 }
2280 read_unlock_bh(&idev->lock);
2281 return -EADDRNOTAVAIL;
2282 }
2283
2284
2285 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2286 {
2287 struct in6_ifreq ireq;
2288 int err;
2289
2290 if (!capable(CAP_NET_ADMIN))
2291 return -EPERM;
2292
2293 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2294 return -EFAULT;
2295
2296 rtnl_lock();
2297 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2298 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2299 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2300 rtnl_unlock();
2301 return err;
2302 }
2303
2304 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2305 {
2306 struct in6_ifreq ireq;
2307 int err;
2308
2309 if (!capable(CAP_NET_ADMIN))
2310 return -EPERM;
2311
2312 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2313 return -EFAULT;
2314
2315 rtnl_lock();
2316 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2317 ireq.ifr6_prefixlen);
2318 rtnl_unlock();
2319 return err;
2320 }
2321
2322 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2323 int plen, int scope)
2324 {
2325 struct inet6_ifaddr *ifp;
2326
2327 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT);
2328 if (!IS_ERR(ifp)) {
2329 spin_lock_bh(&ifp->lock);
2330 ifp->flags &= ~IFA_F_TENTATIVE;
2331 spin_unlock_bh(&ifp->lock);
2332 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2333 in6_ifa_put(ifp);
2334 }
2335 }
2336
2337 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2338 static void sit_add_v4_addrs(struct inet6_dev *idev)
2339 {
2340 struct in6_addr addr;
2341 struct net_device *dev;
2342 struct net *net = dev_net(idev->dev);
2343 int scope;
2344
2345 ASSERT_RTNL();
2346
2347 memset(&addr, 0, sizeof(struct in6_addr));
2348 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2349
2350 if (idev->dev->flags&IFF_POINTOPOINT) {
2351 addr.s6_addr32[0] = htonl(0xfe800000);
2352 scope = IFA_LINK;
2353 } else {
2354 scope = IPV6_ADDR_COMPATv4;
2355 }
2356
2357 if (addr.s6_addr32[3]) {
2358 add_addr(idev, &addr, 128, scope);
2359 return;
2360 }
2361
2362 for_each_netdev(net, dev) {
2363 struct in_device *in_dev = __in_dev_get_rtnl(dev);
2364 if (in_dev && (dev->flags & IFF_UP)) {
2365 struct in_ifaddr *ifa;
2366
2367 int flag = scope;
2368
2369 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2370 int plen;
2371
2372 addr.s6_addr32[3] = ifa->ifa_local;
2373
2374 if (ifa->ifa_scope == RT_SCOPE_LINK)
2375 continue;
2376 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2377 if (idev->dev->flags&IFF_POINTOPOINT)
2378 continue;
2379 flag |= IFA_HOST;
2380 }
2381 if (idev->dev->flags&IFF_POINTOPOINT)
2382 plen = 64;
2383 else
2384 plen = 96;
2385
2386 add_addr(idev, &addr, plen, flag);
2387 }
2388 }
2389 }
2390 }
2391 #endif
2392
2393 static void init_loopback(struct net_device *dev)
2394 {
2395 struct inet6_dev *idev;
2396
2397 /* ::1 */
2398
2399 ASSERT_RTNL();
2400
2401 if ((idev = ipv6_find_idev(dev)) == NULL) {
2402 pr_debug("%s: add_dev failed\n", __func__);
2403 return;
2404 }
2405
2406 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2407 }
2408
2409 static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr)
2410 {
2411 struct inet6_ifaddr *ifp;
2412 u32 addr_flags = IFA_F_PERMANENT;
2413
2414 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2415 if (idev->cnf.optimistic_dad &&
2416 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2417 addr_flags |= IFA_F_OPTIMISTIC;
2418 #endif
2419
2420
2421 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2422 if (!IS_ERR(ifp)) {
2423 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2424 addrconf_dad_start(ifp);
2425 in6_ifa_put(ifp);
2426 }
2427 }
2428
2429 static void addrconf_dev_config(struct net_device *dev)
2430 {
2431 struct in6_addr addr;
2432 struct inet6_dev *idev;
2433
2434 ASSERT_RTNL();
2435
2436 if ((dev->type != ARPHRD_ETHER) &&
2437 (dev->type != ARPHRD_FDDI) &&
2438 (dev->type != ARPHRD_ARCNET) &&
2439 (dev->type != ARPHRD_INFINIBAND) &&
2440 (dev->type != ARPHRD_IEEE802154)) {
2441 /* Alas, we support only Ethernet autoconfiguration. */
2442 return;
2443 }
2444
2445 idev = addrconf_add_dev(dev);
2446 if (IS_ERR(idev))
2447 return;
2448
2449 memset(&addr, 0, sizeof(struct in6_addr));
2450 addr.s6_addr32[0] = htonl(0xFE800000);
2451
2452 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2453 addrconf_add_linklocal(idev, &addr);
2454 }
2455
2456 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2457 static void addrconf_sit_config(struct net_device *dev)
2458 {
2459 struct inet6_dev *idev;
2460
2461 ASSERT_RTNL();
2462
2463 /*
2464 * Configure the tunnel with one of our IPv4
2465 * addresses... we should configure all of
2466 * our v4 addrs in the tunnel
2467 */
2468
2469 if ((idev = ipv6_find_idev(dev)) == NULL) {
2470 pr_debug("%s: add_dev failed\n", __func__);
2471 return;
2472 }
2473
2474 if (dev->priv_flags & IFF_ISATAP) {
2475 struct in6_addr addr;
2476
2477 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2478 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2479 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2480 addrconf_add_linklocal(idev, &addr);
2481 return;
2482 }
2483
2484 sit_add_v4_addrs(idev);
2485
2486 if (dev->flags&IFF_POINTOPOINT) {
2487 addrconf_add_mroute(dev);
2488 addrconf_add_lroute(dev);
2489 } else
2490 sit_route_add(dev);
2491 }
2492 #endif
2493
2494 #if defined(CONFIG_NET_IPGRE) || defined(CONFIG_NET_IPGRE_MODULE)
2495 static void addrconf_gre_config(struct net_device *dev)
2496 {
2497 struct inet6_dev *idev;
2498 struct in6_addr addr;
2499
2500 pr_info("%s(%s)\n", __func__, dev->name);
2501
2502 ASSERT_RTNL();
2503
2504 if ((idev = ipv6_find_idev(dev)) == NULL) {
2505 pr_debug("%s: add_dev failed\n", __func__);
2506 return;
2507 }
2508
2509 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2510 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2511
2512 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2513 addrconf_add_linklocal(idev, &addr);
2514 }
2515 #endif
2516
2517 static inline int
2518 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2519 {
2520 struct in6_addr lladdr;
2521
2522 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2523 addrconf_add_linklocal(idev, &lladdr);
2524 return 0;
2525 }
2526 return -1;
2527 }
2528
2529 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2530 {
2531 struct net_device *link_dev;
2532 struct net *net = dev_net(idev->dev);
2533
2534 /* first try to inherit the link-local address from the link device */
2535 if (idev->dev->iflink &&
2536 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
2537 if (!ipv6_inherit_linklocal(idev, link_dev))
2538 return;
2539 }
2540 /* then try to inherit it from any device */
2541 for_each_netdev(net, link_dev) {
2542 if (!ipv6_inherit_linklocal(idev, link_dev))
2543 return;
2544 }
2545 pr_debug("init ip6-ip6: add_linklocal failed\n");
2546 }
2547
2548 /*
2549 * Autoconfigure tunnel with a link-local address so routing protocols,
2550 * DHCPv6, MLD etc. can be run over the virtual link
2551 */
2552
2553 static void addrconf_ip6_tnl_config(struct net_device *dev)
2554 {
2555 struct inet6_dev *idev;
2556
2557 ASSERT_RTNL();
2558
2559 idev = addrconf_add_dev(dev);
2560 if (IS_ERR(idev)) {
2561 pr_debug("init ip6-ip6: add_dev failed\n");
2562 return;
2563 }
2564 ip6_tnl_add_linklocal(idev);
2565 }
2566
2567 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2568 void *data)
2569 {
2570 struct net_device *dev = (struct net_device *) data;
2571 struct inet6_dev *idev = __in6_dev_get(dev);
2572 int run_pending = 0;
2573 int err;
2574
2575 switch (event) {
2576 case NETDEV_REGISTER:
2577 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2578 idev = ipv6_add_dev(dev);
2579 if (!idev)
2580 return notifier_from_errno(-ENOMEM);
2581 }
2582 break;
2583
2584 case NETDEV_UP:
2585 case NETDEV_CHANGE:
2586 if (dev->flags & IFF_SLAVE)
2587 break;
2588
2589 if (event == NETDEV_UP) {
2590 if (!addrconf_qdisc_ok(dev)) {
2591 /* device is not ready yet. */
2592 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
2593 dev->name);
2594 break;
2595 }
2596
2597 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2598 idev = ipv6_add_dev(dev);
2599
2600 if (idev) {
2601 idev->if_flags |= IF_READY;
2602 run_pending = 1;
2603 }
2604 } else {
2605 if (!addrconf_qdisc_ok(dev)) {
2606 /* device is still not ready. */
2607 break;
2608 }
2609
2610 if (idev) {
2611 if (idev->if_flags & IF_READY)
2612 /* device is already configured. */
2613 break;
2614 idev->if_flags |= IF_READY;
2615 }
2616
2617 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
2618 dev->name);
2619
2620 run_pending = 1;
2621 }
2622
2623 switch (dev->type) {
2624 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2625 case ARPHRD_SIT:
2626 addrconf_sit_config(dev);
2627 break;
2628 #endif
2629 #if defined(CONFIG_NET_IPGRE) || defined(CONFIG_NET_IPGRE_MODULE)
2630 case ARPHRD_IPGRE:
2631 addrconf_gre_config(dev);
2632 break;
2633 #endif
2634 case ARPHRD_TUNNEL6:
2635 addrconf_ip6_tnl_config(dev);
2636 break;
2637 case ARPHRD_LOOPBACK:
2638 init_loopback(dev);
2639 break;
2640
2641 default:
2642 addrconf_dev_config(dev);
2643 break;
2644 }
2645
2646 if (idev) {
2647 if (run_pending)
2648 addrconf_dad_run(idev);
2649
2650 /*
2651 * If the MTU changed during the interface down,
2652 * when the interface up, the changed MTU must be
2653 * reflected in the idev as well as routers.
2654 */
2655 if (idev->cnf.mtu6 != dev->mtu &&
2656 dev->mtu >= IPV6_MIN_MTU) {
2657 rt6_mtu_change(dev, dev->mtu);
2658 idev->cnf.mtu6 = dev->mtu;
2659 }
2660 idev->tstamp = jiffies;
2661 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2662
2663 /*
2664 * If the changed mtu during down is lower than
2665 * IPV6_MIN_MTU stop IPv6 on this interface.
2666 */
2667 if (dev->mtu < IPV6_MIN_MTU)
2668 addrconf_ifdown(dev, 1);
2669 }
2670 break;
2671
2672 case NETDEV_CHANGEMTU:
2673 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2674 rt6_mtu_change(dev, dev->mtu);
2675 idev->cnf.mtu6 = dev->mtu;
2676 break;
2677 }
2678
2679 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2680 idev = ipv6_add_dev(dev);
2681 if (idev)
2682 break;
2683 }
2684
2685 /*
2686 * MTU falled under IPV6_MIN_MTU.
2687 * Stop IPv6 on this interface.
2688 */
2689
2690 case NETDEV_DOWN:
2691 case NETDEV_UNREGISTER:
2692 /*
2693 * Remove all addresses from this interface.
2694 */
2695 addrconf_ifdown(dev, event != NETDEV_DOWN);
2696 break;
2697
2698 case NETDEV_CHANGENAME:
2699 if (idev) {
2700 snmp6_unregister_dev(idev);
2701 addrconf_sysctl_unregister(idev);
2702 addrconf_sysctl_register(idev);
2703 err = snmp6_register_dev(idev);
2704 if (err)
2705 return notifier_from_errno(err);
2706 }
2707 break;
2708
2709 case NETDEV_PRE_TYPE_CHANGE:
2710 case NETDEV_POST_TYPE_CHANGE:
2711 addrconf_type_change(dev, event);
2712 break;
2713 }
2714
2715 return NOTIFY_OK;
2716 }
2717
2718 /*
2719 * addrconf module should be notified of a device going up
2720 */
2721 static struct notifier_block ipv6_dev_notf = {
2722 .notifier_call = addrconf_notify,
2723 };
2724
2725 static void addrconf_type_change(struct net_device *dev, unsigned long event)
2726 {
2727 struct inet6_dev *idev;
2728 ASSERT_RTNL();
2729
2730 idev = __in6_dev_get(dev);
2731
2732 if (event == NETDEV_POST_TYPE_CHANGE)
2733 ipv6_mc_remap(idev);
2734 else if (event == NETDEV_PRE_TYPE_CHANGE)
2735 ipv6_mc_unmap(idev);
2736 }
2737
2738 static int addrconf_ifdown(struct net_device *dev, int how)
2739 {
2740 struct net *net = dev_net(dev);
2741 struct inet6_dev *idev;
2742 struct inet6_ifaddr *ifa;
2743 int state, i;
2744
2745 ASSERT_RTNL();
2746
2747 rt6_ifdown(net, dev);
2748 neigh_ifdown(&nd_tbl, dev);
2749
2750 idev = __in6_dev_get(dev);
2751 if (idev == NULL)
2752 return -ENODEV;
2753
2754 /*
2755 * Step 1: remove reference to ipv6 device from parent device.
2756 * Do not dev_put!
2757 */
2758 if (how) {
2759 idev->dead = 1;
2760
2761 /* protected by rtnl_lock */
2762 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
2763
2764 /* Step 1.5: remove snmp6 entry */
2765 snmp6_unregister_dev(idev);
2766
2767 }
2768
2769 /* Step 2: clear hash table */
2770 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
2771 struct hlist_head *h = &inet6_addr_lst[i];
2772 struct hlist_node *n;
2773
2774 spin_lock_bh(&addrconf_hash_lock);
2775 restart:
2776 hlist_for_each_entry_rcu(ifa, n, h, addr_lst) {
2777 if (ifa->idev == idev) {
2778 hlist_del_init_rcu(&ifa->addr_lst);
2779 addrconf_del_timer(ifa);
2780 goto restart;
2781 }
2782 }
2783 spin_unlock_bh(&addrconf_hash_lock);
2784 }
2785
2786 write_lock_bh(&idev->lock);
2787
2788 /* Step 2: clear flags for stateless addrconf */
2789 if (!how)
2790 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2791
2792 #ifdef CONFIG_IPV6_PRIVACY
2793 if (how && del_timer(&idev->regen_timer))
2794 in6_dev_put(idev);
2795
2796 /* Step 3: clear tempaddr list */
2797 while (!list_empty(&idev->tempaddr_list)) {
2798 ifa = list_first_entry(&idev->tempaddr_list,
2799 struct inet6_ifaddr, tmp_list);
2800 list_del(&ifa->tmp_list);
2801 write_unlock_bh(&idev->lock);
2802 spin_lock_bh(&ifa->lock);
2803
2804 if (ifa->ifpub) {
2805 in6_ifa_put(ifa->ifpub);
2806 ifa->ifpub = NULL;
2807 }
2808 spin_unlock_bh(&ifa->lock);
2809 in6_ifa_put(ifa);
2810 write_lock_bh(&idev->lock);
2811 }
2812 #endif
2813
2814 while (!list_empty(&idev->addr_list)) {
2815 ifa = list_first_entry(&idev->addr_list,
2816 struct inet6_ifaddr, if_list);
2817 addrconf_del_timer(ifa);
2818
2819 list_del(&ifa->if_list);
2820
2821 write_unlock_bh(&idev->lock);
2822
2823 spin_lock_bh(&ifa->state_lock);
2824 state = ifa->state;
2825 ifa->state = INET6_IFADDR_STATE_DEAD;
2826 spin_unlock_bh(&ifa->state_lock);
2827
2828 if (state != INET6_IFADDR_STATE_DEAD) {
2829 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2830 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2831 }
2832 in6_ifa_put(ifa);
2833
2834 write_lock_bh(&idev->lock);
2835 }
2836
2837 write_unlock_bh(&idev->lock);
2838
2839 /* Step 5: Discard multicast list */
2840 if (how)
2841 ipv6_mc_destroy_dev(idev);
2842 else
2843 ipv6_mc_down(idev);
2844
2845 idev->tstamp = jiffies;
2846
2847 /* Last: Shot the device (if unregistered) */
2848 if (how) {
2849 addrconf_sysctl_unregister(idev);
2850 neigh_parms_release(&nd_tbl, idev->nd_parms);
2851 neigh_ifdown(&nd_tbl, dev);
2852 in6_dev_put(idev);
2853 }
2854 return 0;
2855 }
2856
2857 static void addrconf_rs_timer(unsigned long data)
2858 {
2859 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2860 struct inet6_dev *idev = ifp->idev;
2861
2862 read_lock(&idev->lock);
2863 if (idev->dead || !(idev->if_flags & IF_READY))
2864 goto out;
2865
2866 if (idev->cnf.forwarding)
2867 goto out;
2868
2869 /* Announcement received after solicitation was sent */
2870 if (idev->if_flags & IF_RA_RCVD)
2871 goto out;
2872
2873 spin_lock(&ifp->lock);
2874 if (ifp->probes++ < idev->cnf.rtr_solicits) {
2875 /* The wait after the last probe can be shorter */
2876 addrconf_mod_timer(ifp, AC_RS,
2877 (ifp->probes == idev->cnf.rtr_solicits) ?
2878 idev->cnf.rtr_solicit_delay :
2879 idev->cnf.rtr_solicit_interval);
2880 spin_unlock(&ifp->lock);
2881
2882 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2883 } else {
2884 spin_unlock(&ifp->lock);
2885 /*
2886 * Note: we do not support deprecated "all on-link"
2887 * assumption any longer.
2888 */
2889 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
2890 }
2891
2892 out:
2893 read_unlock(&idev->lock);
2894 in6_ifa_put(ifp);
2895 }
2896
2897 /*
2898 * Duplicate Address Detection
2899 */
2900 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2901 {
2902 unsigned long rand_num;
2903 struct inet6_dev *idev = ifp->idev;
2904
2905 if (ifp->flags & IFA_F_OPTIMISTIC)
2906 rand_num = 0;
2907 else
2908 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2909
2910 ifp->probes = idev->cnf.dad_transmits;
2911 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2912 }
2913
2914 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
2915 {
2916 struct inet6_dev *idev = ifp->idev;
2917 struct net_device *dev = idev->dev;
2918
2919 addrconf_join_solict(dev, &ifp->addr);
2920
2921 net_srandom(ifp->addr.s6_addr32[3]);
2922
2923 read_lock_bh(&idev->lock);
2924 spin_lock(&ifp->lock);
2925 if (ifp->state == INET6_IFADDR_STATE_DEAD)
2926 goto out;
2927
2928 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2929 idev->cnf.accept_dad < 1 ||
2930 !(ifp->flags&IFA_F_TENTATIVE) ||
2931 ifp->flags & IFA_F_NODAD) {
2932 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
2933 spin_unlock(&ifp->lock);
2934 read_unlock_bh(&idev->lock);
2935
2936 addrconf_dad_completed(ifp);
2937 return;
2938 }
2939
2940 if (!(idev->if_flags & IF_READY)) {
2941 spin_unlock(&ifp->lock);
2942 read_unlock_bh(&idev->lock);
2943 /*
2944 * If the device is not ready:
2945 * - keep it tentative if it is a permanent address.
2946 * - otherwise, kill it.
2947 */
2948 in6_ifa_hold(ifp);
2949 addrconf_dad_stop(ifp, 0);
2950 return;
2951 }
2952
2953 /*
2954 * Optimistic nodes can start receiving
2955 * Frames right away
2956 */
2957 if (ifp->flags & IFA_F_OPTIMISTIC)
2958 ip6_ins_rt(ifp->rt);
2959
2960 addrconf_dad_kick(ifp);
2961 out:
2962 spin_unlock(&ifp->lock);
2963 read_unlock_bh(&idev->lock);
2964 }
2965
2966 static void addrconf_dad_timer(unsigned long data)
2967 {
2968 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2969 struct inet6_dev *idev = ifp->idev;
2970 struct in6_addr mcaddr;
2971
2972 if (!ifp->probes && addrconf_dad_end(ifp))
2973 goto out;
2974
2975 read_lock(&idev->lock);
2976 if (idev->dead || !(idev->if_flags & IF_READY)) {
2977 read_unlock(&idev->lock);
2978 goto out;
2979 }
2980
2981 spin_lock(&ifp->lock);
2982 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
2983 spin_unlock(&ifp->lock);
2984 read_unlock(&idev->lock);
2985 goto out;
2986 }
2987
2988 if (ifp->probes == 0) {
2989 /*
2990 * DAD was successful
2991 */
2992
2993 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
2994 spin_unlock(&ifp->lock);
2995 read_unlock(&idev->lock);
2996
2997 addrconf_dad_completed(ifp);
2998
2999 goto out;
3000 }
3001
3002 ifp->probes--;
3003 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
3004 spin_unlock(&ifp->lock);
3005 read_unlock(&idev->lock);
3006
3007 /* send a neighbour solicitation for our addr */
3008 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3009 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
3010 out:
3011 in6_ifa_put(ifp);
3012 }
3013
3014 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3015 {
3016 struct net_device *dev = ifp->idev->dev;
3017
3018 /*
3019 * Configure the address for reception. Now it is valid.
3020 */
3021
3022 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3023
3024 /* If added prefix is link local and we are prepared to process
3025 router advertisements, start sending router solicitations.
3026 */
3027
3028 if (((ifp->idev->cnf.accept_ra == 1 && !ifp->idev->cnf.forwarding) ||
3029 ifp->idev->cnf.accept_ra == 2) &&
3030 ifp->idev->cnf.rtr_solicits > 0 &&
3031 (dev->flags&IFF_LOOPBACK) == 0 &&
3032 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
3033 /*
3034 * If a host as already performed a random delay
3035 * [...] as part of DAD [...] there is no need
3036 * to delay again before sending the first RS
3037 */
3038 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
3039
3040 spin_lock_bh(&ifp->lock);
3041 ifp->probes = 1;
3042 ifp->idev->if_flags |= IF_RS_SENT;
3043 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
3044 spin_unlock_bh(&ifp->lock);
3045 }
3046 }
3047
3048 static void addrconf_dad_run(struct inet6_dev *idev)
3049 {
3050 struct inet6_ifaddr *ifp;
3051
3052 read_lock_bh(&idev->lock);
3053 list_for_each_entry(ifp, &idev->addr_list, if_list) {
3054 spin_lock(&ifp->lock);
3055 if (ifp->flags & IFA_F_TENTATIVE &&
3056 ifp->state == INET6_IFADDR_STATE_DAD)
3057 addrconf_dad_kick(ifp);
3058 spin_unlock(&ifp->lock);
3059 }
3060 read_unlock_bh(&idev->lock);
3061 }
3062
3063 #ifdef CONFIG_PROC_FS
3064 struct if6_iter_state {
3065 struct seq_net_private p;
3066 int bucket;
3067 int offset;
3068 };
3069
3070 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
3071 {
3072 struct inet6_ifaddr *ifa = NULL;
3073 struct if6_iter_state *state = seq->private;
3074 struct net *net = seq_file_net(seq);
3075 int p = 0;
3076
3077 /* initial bucket if pos is 0 */
3078 if (pos == 0) {
3079 state->bucket = 0;
3080 state->offset = 0;
3081 }
3082
3083 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3084 struct hlist_node *n;
3085 hlist_for_each_entry_rcu_bh(ifa, n, &inet6_addr_lst[state->bucket],
3086 addr_lst) {
3087 /* sync with offset */
3088 if (p < state->offset) {
3089 p++;
3090 continue;
3091 }
3092 state->offset++;
3093 if (net_eq(dev_net(ifa->idev->dev), net))
3094 return ifa;
3095 }
3096
3097 /* prepare for next bucket */
3098 state->offset = 0;
3099 p = 0;
3100 }
3101 return NULL;
3102 }
3103
3104 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3105 struct inet6_ifaddr *ifa)
3106 {
3107 struct if6_iter_state *state = seq->private;
3108 struct net *net = seq_file_net(seq);
3109 struct hlist_node *n = &ifa->addr_lst;
3110
3111 hlist_for_each_entry_continue_rcu_bh(ifa, n, addr_lst) {
3112 state->offset++;
3113 if (net_eq(dev_net(ifa->idev->dev), net))
3114 return ifa;
3115 }
3116
3117 while (++state->bucket < IN6_ADDR_HSIZE) {
3118 state->offset = 0;
3119 hlist_for_each_entry_rcu_bh(ifa, n,
3120 &inet6_addr_lst[state->bucket], addr_lst) {
3121 state->offset++;
3122 if (net_eq(dev_net(ifa->idev->dev), net))
3123 return ifa;
3124 }
3125 }
3126
3127 return NULL;
3128 }
3129
3130 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3131 __acquires(rcu_bh)
3132 {
3133 rcu_read_lock_bh();
3134 return if6_get_first(seq, *pos);
3135 }
3136
3137 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3138 {
3139 struct inet6_ifaddr *ifa;
3140
3141 ifa = if6_get_next(seq, v);
3142 ++*pos;
3143 return ifa;
3144 }
3145
3146 static void if6_seq_stop(struct seq_file *seq, void *v)
3147 __releases(rcu_bh)
3148 {
3149 rcu_read_unlock_bh();
3150 }
3151
3152 static int if6_seq_show(struct seq_file *seq, void *v)
3153 {
3154 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3155 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3156 &ifp->addr,
3157 ifp->idev->dev->ifindex,
3158 ifp->prefix_len,
3159 ifp->scope,
3160 ifp->flags,
3161 ifp->idev->dev->name);
3162 return 0;
3163 }
3164
3165 static const struct seq_operations if6_seq_ops = {
3166 .start = if6_seq_start,
3167 .next = if6_seq_next,
3168 .show = if6_seq_show,
3169 .stop = if6_seq_stop,
3170 };
3171
3172 static int if6_seq_open(struct inode *inode, struct file *file)
3173 {
3174 return seq_open_net(inode, file, &if6_seq_ops,
3175 sizeof(struct if6_iter_state));
3176 }
3177
3178 static const struct file_operations if6_fops = {
3179 .owner = THIS_MODULE,
3180 .open = if6_seq_open,
3181 .read = seq_read,
3182 .llseek = seq_lseek,
3183 .release = seq_release_net,
3184 };
3185
3186 static int __net_init if6_proc_net_init(struct net *net)
3187 {
3188 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
3189 return -ENOMEM;
3190 return 0;
3191 }
3192
3193 static void __net_exit if6_proc_net_exit(struct net *net)
3194 {
3195 proc_net_remove(net, "if_inet6");
3196 }
3197
3198 static struct pernet_operations if6_proc_net_ops = {
3199 .init = if6_proc_net_init,
3200 .exit = if6_proc_net_exit,
3201 };
3202
3203 int __init if6_proc_init(void)
3204 {
3205 return register_pernet_subsys(&if6_proc_net_ops);
3206 }
3207
3208 void if6_proc_exit(void)
3209 {
3210 unregister_pernet_subsys(&if6_proc_net_ops);
3211 }
3212 #endif /* CONFIG_PROC_FS */
3213
3214 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3215 /* Check if address is a home address configured on any interface. */
3216 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3217 {
3218 int ret = 0;
3219 struct inet6_ifaddr *ifp = NULL;
3220 struct hlist_node *n;
3221 unsigned int hash = inet6_addr_hash(addr);
3222
3223 rcu_read_lock_bh();
3224 hlist_for_each_entry_rcu_bh(ifp, n, &inet6_addr_lst[hash], addr_lst) {
3225 if (!net_eq(dev_net(ifp->idev->dev), net))
3226 continue;
3227 if (ipv6_addr_equal(&ifp->addr, addr) &&
3228 (ifp->flags & IFA_F_HOMEADDRESS)) {
3229 ret = 1;
3230 break;
3231 }
3232 }
3233 rcu_read_unlock_bh();
3234 return ret;
3235 }
3236 #endif
3237
3238 /*
3239 * Periodic address status verification
3240 */
3241
3242 static void addrconf_verify(unsigned long foo)
3243 {
3244 unsigned long now, next, next_sec, next_sched;
3245 struct inet6_ifaddr *ifp;
3246 struct hlist_node *node;
3247 int i;
3248
3249 rcu_read_lock_bh();
3250 spin_lock(&addrconf_verify_lock);
3251 now = jiffies;
3252 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3253
3254 del_timer(&addr_chk_timer);
3255
3256 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3257 restart:
3258 hlist_for_each_entry_rcu_bh(ifp, node,
3259 &inet6_addr_lst[i], addr_lst) {
3260 unsigned long age;
3261
3262 if (ifp->flags & IFA_F_PERMANENT)
3263 continue;
3264
3265 spin_lock(&ifp->lock);
3266 /* We try to batch several events at once. */
3267 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3268
3269 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3270 age >= ifp->valid_lft) {
3271 spin_unlock(&ifp->lock);
3272 in6_ifa_hold(ifp);
3273 ipv6_del_addr(ifp);
3274 goto restart;
3275 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3276 spin_unlock(&ifp->lock);
3277 continue;
3278 } else if (age >= ifp->prefered_lft) {
3279 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3280 int deprecate = 0;
3281
3282 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3283 deprecate = 1;
3284 ifp->flags |= IFA_F_DEPRECATED;
3285 }
3286
3287 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3288 next = ifp->tstamp + ifp->valid_lft * HZ;
3289
3290 spin_unlock(&ifp->lock);
3291
3292 if (deprecate) {
3293 in6_ifa_hold(ifp);
3294
3295 ipv6_ifa_notify(0, ifp);
3296 in6_ifa_put(ifp);
3297 goto restart;
3298 }
3299 #ifdef CONFIG_IPV6_PRIVACY
3300 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3301 !(ifp->flags&IFA_F_TENTATIVE)) {
3302 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3303 ifp->idev->cnf.dad_transmits *
3304 ifp->idev->nd_parms->retrans_time / HZ;
3305
3306 if (age >= ifp->prefered_lft - regen_advance) {
3307 struct inet6_ifaddr *ifpub = ifp->ifpub;
3308 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3309 next = ifp->tstamp + ifp->prefered_lft * HZ;
3310 if (!ifp->regen_count && ifpub) {
3311 ifp->regen_count++;
3312 in6_ifa_hold(ifp);
3313 in6_ifa_hold(ifpub);
3314 spin_unlock(&ifp->lock);
3315
3316 spin_lock(&ifpub->lock);
3317 ifpub->regen_count = 0;
3318 spin_unlock(&ifpub->lock);
3319 ipv6_create_tempaddr(ifpub, ifp);
3320 in6_ifa_put(ifpub);
3321 in6_ifa_put(ifp);
3322 goto restart;
3323 }
3324 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3325 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3326 spin_unlock(&ifp->lock);
3327 #endif
3328 } else {
3329 /* ifp->prefered_lft <= ifp->valid_lft */
3330 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3331 next = ifp->tstamp + ifp->prefered_lft * HZ;
3332 spin_unlock(&ifp->lock);
3333 }
3334 }
3335 }
3336
3337 next_sec = round_jiffies_up(next);
3338 next_sched = next;
3339
3340 /* If rounded timeout is accurate enough, accept it. */
3341 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3342 next_sched = next_sec;
3343
3344 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3345 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3346 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3347
3348 ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3349 now, next, next_sec, next_sched));
3350
3351 addr_chk_timer.expires = next_sched;
3352 add_timer(&addr_chk_timer);
3353 spin_unlock(&addrconf_verify_lock);
3354 rcu_read_unlock_bh();
3355 }
3356
3357 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3358 {
3359 struct in6_addr *pfx = NULL;
3360
3361 if (addr)
3362 pfx = nla_data(addr);
3363
3364 if (local) {
3365 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3366 pfx = NULL;
3367 else
3368 pfx = nla_data(local);
3369 }
3370
3371 return pfx;
3372 }
3373
3374 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3375 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3376 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3377 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3378 };
3379
3380 static int
3381 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3382 {
3383 struct net *net = sock_net(skb->sk);
3384 struct ifaddrmsg *ifm;
3385 struct nlattr *tb[IFA_MAX+1];
3386 struct in6_addr *pfx;
3387 int err;
3388
3389 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3390 if (err < 0)
3391 return err;
3392
3393 ifm = nlmsg_data(nlh);
3394 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3395 if (pfx == NULL)
3396 return -EINVAL;
3397
3398 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3399 }
3400
3401 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3402 u32 prefered_lft, u32 valid_lft)
3403 {
3404 u32 flags;
3405 clock_t expires;
3406 unsigned long timeout;
3407
3408 if (!valid_lft || (prefered_lft > valid_lft))
3409 return -EINVAL;
3410
3411 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3412 if (addrconf_finite_timeout(timeout)) {
3413 expires = jiffies_to_clock_t(timeout * HZ);
3414 valid_lft = timeout;
3415 flags = RTF_EXPIRES;
3416 } else {
3417 expires = 0;
3418 flags = 0;
3419 ifa_flags |= IFA_F_PERMANENT;
3420 }
3421
3422 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3423 if (addrconf_finite_timeout(timeout)) {
3424 if (timeout == 0)
3425 ifa_flags |= IFA_F_DEPRECATED;
3426 prefered_lft = timeout;
3427 }
3428
3429 spin_lock_bh(&ifp->lock);
3430 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3431 ifp->tstamp = jiffies;
3432 ifp->valid_lft = valid_lft;
3433 ifp->prefered_lft = prefered_lft;
3434
3435 spin_unlock_bh(&ifp->lock);
3436 if (!(ifp->flags&IFA_F_TENTATIVE))
3437 ipv6_ifa_notify(0, ifp);
3438
3439 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3440 expires, flags);
3441 addrconf_verify(0);
3442
3443 return 0;
3444 }
3445
3446 static int
3447 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3448 {
3449 struct net *net = sock_net(skb->sk);
3450 struct ifaddrmsg *ifm;
3451 struct nlattr *tb[IFA_MAX+1];
3452 struct in6_addr *pfx;
3453 struct inet6_ifaddr *ifa;
3454 struct net_device *dev;
3455 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3456 u8 ifa_flags;
3457 int err;
3458
3459 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3460 if (err < 0)
3461 return err;
3462
3463 ifm = nlmsg_data(nlh);
3464 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3465 if (pfx == NULL)
3466 return -EINVAL;
3467
3468 if (tb[IFA_CACHEINFO]) {
3469 struct ifa_cacheinfo *ci;
3470
3471 ci = nla_data(tb[IFA_CACHEINFO]);
3472 valid_lft = ci->ifa_valid;
3473 preferred_lft = ci->ifa_prefered;
3474 } else {
3475 preferred_lft = INFINITY_LIFE_TIME;
3476 valid_lft = INFINITY_LIFE_TIME;
3477 }
3478
3479 dev = __dev_get_by_index(net, ifm->ifa_index);
3480 if (dev == NULL)
3481 return -ENODEV;
3482
3483 /* We ignore other flags so far. */
3484 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3485
3486 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3487 if (ifa == NULL) {
3488 /*
3489 * It would be best to check for !NLM_F_CREATE here but
3490 * userspace alreay relies on not having to provide this.
3491 */
3492 return inet6_addr_add(net, ifm->ifa_index, pfx,
3493 ifm->ifa_prefixlen, ifa_flags,
3494 preferred_lft, valid_lft);
3495 }
3496
3497 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3498 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3499 err = -EEXIST;
3500 else
3501 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3502
3503 in6_ifa_put(ifa);
3504
3505 return err;
3506 }
3507
3508 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3509 u8 scope, int ifindex)
3510 {
3511 struct ifaddrmsg *ifm;
3512
3513 ifm = nlmsg_data(nlh);
3514 ifm->ifa_family = AF_INET6;
3515 ifm->ifa_prefixlen = prefixlen;
3516 ifm->ifa_flags = flags;
3517 ifm->ifa_scope = scope;
3518 ifm->ifa_index = ifindex;
3519 }
3520
3521 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3522 unsigned long tstamp, u32 preferred, u32 valid)
3523 {
3524 struct ifa_cacheinfo ci;
3525
3526 ci.cstamp = cstamp_delta(cstamp);
3527 ci.tstamp = cstamp_delta(tstamp);
3528 ci.ifa_prefered = preferred;
3529 ci.ifa_valid = valid;
3530
3531 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3532 }
3533
3534 static inline int rt_scope(int ifa_scope)
3535 {
3536 if (ifa_scope & IFA_HOST)
3537 return RT_SCOPE_HOST;
3538 else if (ifa_scope & IFA_LINK)
3539 return RT_SCOPE_LINK;
3540 else if (ifa_scope & IFA_SITE)
3541 return RT_SCOPE_SITE;
3542 else
3543 return RT_SCOPE_UNIVERSE;
3544 }
3545
3546 static inline int inet6_ifaddr_msgsize(void)
3547 {
3548 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3549 + nla_total_size(16) /* IFA_ADDRESS */
3550 + nla_total_size(sizeof(struct ifa_cacheinfo));
3551 }
3552
3553 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3554 u32 pid, u32 seq, int event, unsigned int flags)
3555 {
3556 struct nlmsghdr *nlh;
3557 u32 preferred, valid;
3558
3559 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3560 if (nlh == NULL)
3561 return -EMSGSIZE;
3562
3563 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3564 ifa->idev->dev->ifindex);
3565
3566 if (!(ifa->flags&IFA_F_PERMANENT)) {
3567 preferred = ifa->prefered_lft;
3568 valid = ifa->valid_lft;
3569 if (preferred != INFINITY_LIFE_TIME) {
3570 long tval = (jiffies - ifa->tstamp)/HZ;
3571 if (preferred > tval)
3572 preferred -= tval;
3573 else
3574 preferred = 0;
3575 if (valid != INFINITY_LIFE_TIME) {
3576 if (valid > tval)
3577 valid -= tval;
3578 else
3579 valid = 0;
3580 }
3581 }
3582 } else {
3583 preferred = INFINITY_LIFE_TIME;
3584 valid = INFINITY_LIFE_TIME;
3585 }
3586
3587 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3588 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3589 nlmsg_cancel(skb, nlh);
3590 return -EMSGSIZE;
3591 }
3592
3593 return nlmsg_end(skb, nlh);
3594 }
3595
3596 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3597 u32 pid, u32 seq, int event, u16 flags)
3598 {
3599 struct nlmsghdr *nlh;
3600 u8 scope = RT_SCOPE_UNIVERSE;
3601 int ifindex = ifmca->idev->dev->ifindex;
3602
3603 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3604 scope = RT_SCOPE_SITE;
3605
3606 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3607 if (nlh == NULL)
3608 return -EMSGSIZE;
3609
3610 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3611 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3612 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3613 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3614 nlmsg_cancel(skb, nlh);
3615 return -EMSGSIZE;
3616 }
3617
3618 return nlmsg_end(skb, nlh);
3619 }
3620
3621 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3622 u32 pid, u32 seq, int event, unsigned int flags)
3623 {
3624 struct nlmsghdr *nlh;
3625 u8 scope = RT_SCOPE_UNIVERSE;
3626 int ifindex = ifaca->aca_idev->dev->ifindex;
3627
3628 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3629 scope = RT_SCOPE_SITE;
3630
3631 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3632 if (nlh == NULL)
3633 return -EMSGSIZE;
3634
3635 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3636 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3637 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3638 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3639 nlmsg_cancel(skb, nlh);
3640 return -EMSGSIZE;
3641 }
3642
3643 return nlmsg_end(skb, nlh);
3644 }
3645
3646 enum addr_type_t {
3647 UNICAST_ADDR,
3648 MULTICAST_ADDR,
3649 ANYCAST_ADDR,
3650 };
3651
3652 /* called with rcu_read_lock() */
3653 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3654 struct netlink_callback *cb, enum addr_type_t type,
3655 int s_ip_idx, int *p_ip_idx)
3656 {
3657 struct ifmcaddr6 *ifmca;
3658 struct ifacaddr6 *ifaca;
3659 int err = 1;
3660 int ip_idx = *p_ip_idx;
3661
3662 read_lock_bh(&idev->lock);
3663 switch (type) {
3664 case UNICAST_ADDR: {
3665 struct inet6_ifaddr *ifa;
3666
3667 /* unicast address incl. temp addr */
3668 list_for_each_entry(ifa, &idev->addr_list, if_list) {
3669 if (++ip_idx < s_ip_idx)
3670 continue;
3671 err = inet6_fill_ifaddr(skb, ifa,
3672 NETLINK_CB(cb->skb).pid,
3673 cb->nlh->nlmsg_seq,
3674 RTM_NEWADDR,
3675 NLM_F_MULTI);
3676 if (err <= 0)
3677 break;
3678 }
3679 break;
3680 }
3681 case MULTICAST_ADDR:
3682 /* multicast address */
3683 for (ifmca = idev->mc_list; ifmca;
3684 ifmca = ifmca->next, ip_idx++) {
3685 if (ip_idx < s_ip_idx)
3686 continue;
3687 err = inet6_fill_ifmcaddr(skb, ifmca,
3688 NETLINK_CB(cb->skb).pid,
3689 cb->nlh->nlmsg_seq,
3690 RTM_GETMULTICAST,
3691 NLM_F_MULTI);
3692 if (err <= 0)
3693 break;
3694 }
3695 break;
3696 case ANYCAST_ADDR:
3697 /* anycast address */
3698 for (ifaca = idev->ac_list; ifaca;
3699 ifaca = ifaca->aca_next, ip_idx++) {
3700 if (ip_idx < s_ip_idx)
3701 continue;
3702 err = inet6_fill_ifacaddr(skb, ifaca,
3703 NETLINK_CB(cb->skb).pid,
3704 cb->nlh->nlmsg_seq,
3705 RTM_GETANYCAST,
3706 NLM_F_MULTI);
3707 if (err <= 0)
3708 break;
3709 }
3710 break;
3711 default:
3712 break;
3713 }
3714 read_unlock_bh(&idev->lock);
3715 *p_ip_idx = ip_idx;
3716 return err;
3717 }
3718
3719 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3720 enum addr_type_t type)
3721 {
3722 struct net *net = sock_net(skb->sk);
3723 int h, s_h;
3724 int idx, ip_idx;
3725 int s_idx, s_ip_idx;
3726 struct net_device *dev;
3727 struct inet6_dev *idev;
3728 struct hlist_head *head;
3729 struct hlist_node *node;
3730
3731 s_h = cb->args[0];
3732 s_idx = idx = cb->args[1];
3733 s_ip_idx = ip_idx = cb->args[2];
3734
3735 rcu_read_lock();
3736 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3737 idx = 0;
3738 head = &net->dev_index_head[h];
3739 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3740 if (idx < s_idx)
3741 goto cont;
3742 if (h > s_h || idx > s_idx)
3743 s_ip_idx = 0;
3744 ip_idx = 0;
3745 idev = __in6_dev_get(dev);
3746 if (!idev)
3747 goto cont;
3748
3749 if (in6_dump_addrs(idev, skb, cb, type,
3750 s_ip_idx, &ip_idx) <= 0)
3751 goto done;
3752 cont:
3753 idx++;
3754 }
3755 }
3756 done:
3757 rcu_read_unlock();
3758 cb->args[0] = h;
3759 cb->args[1] = idx;
3760 cb->args[2] = ip_idx;
3761
3762 return skb->len;
3763 }
3764
3765 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3766 {
3767 enum addr_type_t type = UNICAST_ADDR;
3768
3769 return inet6_dump_addr(skb, cb, type);
3770 }
3771
3772 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3773 {
3774 enum addr_type_t type = MULTICAST_ADDR;
3775
3776 return inet6_dump_addr(skb, cb, type);
3777 }
3778
3779
3780 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3781 {
3782 enum addr_type_t type = ANYCAST_ADDR;
3783
3784 return inet6_dump_addr(skb, cb, type);
3785 }
3786
3787 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
3788 void *arg)
3789 {
3790 struct net *net = sock_net(in_skb->sk);
3791 struct ifaddrmsg *ifm;
3792 struct nlattr *tb[IFA_MAX+1];
3793 struct in6_addr *addr = NULL;
3794 struct net_device *dev = NULL;
3795 struct inet6_ifaddr *ifa;
3796 struct sk_buff *skb;
3797 int err;
3798
3799 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3800 if (err < 0)
3801 goto errout;
3802
3803 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3804 if (addr == NULL) {
3805 err = -EINVAL;
3806 goto errout;
3807 }
3808
3809 ifm = nlmsg_data(nlh);
3810 if (ifm->ifa_index)
3811 dev = __dev_get_by_index(net, ifm->ifa_index);
3812
3813 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
3814 if (!ifa) {
3815 err = -EADDRNOTAVAIL;
3816 goto errout;
3817 }
3818
3819 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
3820 if (!skb) {
3821 err = -ENOBUFS;
3822 goto errout_ifa;
3823 }
3824
3825 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3826 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3827 if (err < 0) {
3828 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3829 WARN_ON(err == -EMSGSIZE);
3830 kfree_skb(skb);
3831 goto errout_ifa;
3832 }
3833 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
3834 errout_ifa:
3835 in6_ifa_put(ifa);
3836 errout:
3837 return err;
3838 }
3839
3840 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3841 {
3842 struct sk_buff *skb;
3843 struct net *net = dev_net(ifa->idev->dev);
3844 int err = -ENOBUFS;
3845
3846 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3847 if (skb == NULL)
3848 goto errout;
3849
3850 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3851 if (err < 0) {
3852 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3853 WARN_ON(err == -EMSGSIZE);
3854 kfree_skb(skb);
3855 goto errout;
3856 }
3857 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3858 return;
3859 errout:
3860 if (err < 0)
3861 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3862 }
3863
3864 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3865 __s32 *array, int bytes)
3866 {
3867 BUG_ON(bytes < (DEVCONF_MAX * 4));
3868
3869 memset(array, 0, bytes);
3870 array[DEVCONF_FORWARDING] = cnf->forwarding;
3871 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3872 array[DEVCONF_MTU6] = cnf->mtu6;
3873 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3874 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3875 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3876 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3877 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3878 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
3879 jiffies_to_msecs(cnf->rtr_solicit_interval);
3880 array[DEVCONF_RTR_SOLICIT_DELAY] =
3881 jiffies_to_msecs(cnf->rtr_solicit_delay);
3882 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3883 #ifdef CONFIG_IPV6_PRIVACY
3884 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3885 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3886 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3887 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3888 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3889 #endif
3890 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3891 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3892 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3893 #ifdef CONFIG_IPV6_ROUTER_PREF
3894 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3895 array[DEVCONF_RTR_PROBE_INTERVAL] =
3896 jiffies_to_msecs(cnf->rtr_probe_interval);
3897 #ifdef CONFIG_IPV6_ROUTE_INFO
3898 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3899 #endif
3900 #endif
3901 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3902 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3903 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3904 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3905 #endif
3906 #ifdef CONFIG_IPV6_MROUTE
3907 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
3908 #endif
3909 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
3910 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
3911 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
3912 }
3913
3914 static inline size_t inet6_ifla6_size(void)
3915 {
3916 return nla_total_size(4) /* IFLA_INET6_FLAGS */
3917 + nla_total_size(sizeof(struct ifla_cacheinfo))
3918 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3919 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3920 + nla_total_size(ICMP6_MIB_MAX * 8); /* IFLA_INET6_ICMP6STATS */
3921 }
3922
3923 static inline size_t inet6_if_nlmsg_size(void)
3924 {
3925 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3926 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3927 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3928 + nla_total_size(4) /* IFLA_MTU */
3929 + nla_total_size(4) /* IFLA_LINK */
3930 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
3931 }
3932
3933 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
3934 int items, int bytes)
3935 {
3936 int i;
3937 int pad = bytes - sizeof(u64) * items;
3938 BUG_ON(pad < 0);
3939
3940 /* Use put_unaligned() because stats may not be aligned for u64. */
3941 put_unaligned(items, &stats[0]);
3942 for (i = 1; i < items; i++)
3943 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
3944
3945 memset(&stats[items], 0, pad);
3946 }
3947
3948 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib,
3949 int items, int bytes, size_t syncpoff)
3950 {
3951 int i;
3952 int pad = bytes - sizeof(u64) * items;
3953 BUG_ON(pad < 0);
3954
3955 /* Use put_unaligned() because stats may not be aligned for u64. */
3956 put_unaligned(items, &stats[0]);
3957 for (i = 1; i < items; i++)
3958 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
3959
3960 memset(&stats[items], 0, pad);
3961 }
3962
3963 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3964 int bytes)
3965 {
3966 switch (attrtype) {
3967 case IFLA_INET6_STATS:
3968 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6,
3969 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
3970 break;
3971 case IFLA_INET6_ICMP6STATS:
3972 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
3973 break;
3974 }
3975 }
3976
3977 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
3978 {
3979 struct nlattr *nla;
3980 struct ifla_cacheinfo ci;
3981
3982 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
3983 goto nla_put_failure;
3984 ci.max_reasm_len = IPV6_MAXPLEN;
3985 ci.tstamp = cstamp_delta(idev->tstamp);
3986 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
3987 ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time);
3988 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
3989 goto nla_put_failure;
3990 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3991 if (nla == NULL)
3992 goto nla_put_failure;
3993 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
3994
3995 /* XXX - MC not implemented */
3996
3997 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3998 if (nla == NULL)
3999 goto nla_put_failure;
4000 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4001
4002 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4003 if (nla == NULL)
4004 goto nla_put_failure;
4005 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4006
4007 return 0;
4008
4009 nla_put_failure:
4010 return -EMSGSIZE;
4011 }
4012
4013 static size_t inet6_get_link_af_size(const struct net_device *dev)
4014 {
4015 if (!__in6_dev_get(dev))
4016 return 0;
4017
4018 return inet6_ifla6_size();
4019 }
4020
4021 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
4022 {
4023 struct inet6_dev *idev = __in6_dev_get(dev);
4024
4025 if (!idev)
4026 return -ENODATA;
4027
4028 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4029 return -EMSGSIZE;
4030
4031 return 0;
4032 }
4033
4034 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
4035 u32 pid, u32 seq, int event, unsigned int flags)
4036 {
4037 struct net_device *dev = idev->dev;
4038 struct ifinfomsg *hdr;
4039 struct nlmsghdr *nlh;
4040 void *protoinfo;
4041
4042 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
4043 if (nlh == NULL)
4044 return -EMSGSIZE;
4045
4046 hdr = nlmsg_data(nlh);
4047 hdr->ifi_family = AF_INET6;
4048 hdr->__ifi_pad = 0;
4049 hdr->ifi_type = dev->type;
4050 hdr->ifi_index = dev->ifindex;
4051 hdr->ifi_flags = dev_get_flags(dev);
4052 hdr->ifi_change = 0;
4053
4054 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4055 (dev->addr_len &&
4056 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4057 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4058 (dev->ifindex != dev->iflink &&
4059 nla_put_u32(skb, IFLA_LINK, dev->iflink)))
4060 goto nla_put_failure;
4061 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4062 if (protoinfo == NULL)
4063 goto nla_put_failure;
4064
4065 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4066 goto nla_put_failure;
4067
4068 nla_nest_end(skb, protoinfo);
4069 return nlmsg_end(skb, nlh);
4070
4071 nla_put_failure:
4072 nlmsg_cancel(skb, nlh);
4073 return -EMSGSIZE;
4074 }
4075
4076 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4077 {
4078 struct net *net = sock_net(skb->sk);
4079 int h, s_h;
4080 int idx = 0, s_idx;
4081 struct net_device *dev;
4082 struct inet6_dev *idev;
4083 struct hlist_head *head;
4084 struct hlist_node *node;
4085
4086 s_h = cb->args[0];
4087 s_idx = cb->args[1];
4088
4089 rcu_read_lock();
4090 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4091 idx = 0;
4092 head = &net->dev_index_head[h];
4093 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
4094 if (idx < s_idx)
4095 goto cont;
4096 idev = __in6_dev_get(dev);
4097 if (!idev)
4098 goto cont;
4099 if (inet6_fill_ifinfo(skb, idev,
4100 NETLINK_CB(cb->skb).pid,
4101 cb->nlh->nlmsg_seq,
4102 RTM_NEWLINK, NLM_F_MULTI) <= 0)
4103 goto out;
4104 cont:
4105 idx++;
4106 }
4107 }
4108 out:
4109 rcu_read_unlock();
4110 cb->args[1] = idx;
4111 cb->args[0] = h;
4112
4113 return skb->len;
4114 }
4115
4116 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4117 {
4118 struct sk_buff *skb;
4119 struct net *net = dev_net(idev->dev);
4120 int err = -ENOBUFS;
4121
4122 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
4123 if (skb == NULL)
4124 goto errout;
4125
4126 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
4127 if (err < 0) {
4128 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4129 WARN_ON(err == -EMSGSIZE);
4130 kfree_skb(skb);
4131 goto errout;
4132 }
4133 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
4134 return;
4135 errout:
4136 if (err < 0)
4137 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
4138 }
4139
4140 static inline size_t inet6_prefix_nlmsg_size(void)
4141 {
4142 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4143 + nla_total_size(sizeof(struct in6_addr))
4144 + nla_total_size(sizeof(struct prefix_cacheinfo));
4145 }
4146
4147 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
4148 struct prefix_info *pinfo, u32 pid, u32 seq,
4149 int event, unsigned int flags)
4150 {
4151 struct prefixmsg *pmsg;
4152 struct nlmsghdr *nlh;
4153 struct prefix_cacheinfo ci;
4154
4155 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
4156 if (nlh == NULL)
4157 return -EMSGSIZE;
4158
4159 pmsg = nlmsg_data(nlh);
4160 pmsg->prefix_family = AF_INET6;
4161 pmsg->prefix_pad1 = 0;
4162 pmsg->prefix_pad2 = 0;
4163 pmsg->prefix_ifindex = idev->dev->ifindex;
4164 pmsg->prefix_len = pinfo->prefix_len;
4165 pmsg->prefix_type = pinfo->type;
4166 pmsg->prefix_pad3 = 0;
4167 pmsg->prefix_flags = 0;
4168 if (pinfo->onlink)
4169 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4170 if (pinfo->autoconf)
4171 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4172
4173 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
4174 goto nla_put_failure;
4175 ci.preferred_time = ntohl(pinfo->prefered);
4176 ci.valid_time = ntohl(pinfo->valid);
4177 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
4178 goto nla_put_failure;
4179 return nlmsg_end(skb, nlh);
4180
4181 nla_put_failure:
4182 nlmsg_cancel(skb, nlh);
4183 return -EMSGSIZE;
4184 }
4185
4186 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
4187 struct prefix_info *pinfo)
4188 {
4189 struct sk_buff *skb;
4190 struct net *net = dev_net(idev->dev);
4191 int err = -ENOBUFS;
4192
4193 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
4194 if (skb == NULL)
4195 goto errout;
4196
4197 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
4198 if (err < 0) {
4199 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4200 WARN_ON(err == -EMSGSIZE);
4201 kfree_skb(skb);
4202 goto errout;
4203 }
4204 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4205 return;
4206 errout:
4207 if (err < 0)
4208 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
4209 }
4210
4211 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4212 {
4213 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4214
4215 switch (event) {
4216 case RTM_NEWADDR:
4217 /*
4218 * If the address was optimistic
4219 * we inserted the route at the start of
4220 * our DAD process, so we don't need
4221 * to do it again
4222 */
4223 if (!(ifp->rt->rt6i_node))
4224 ip6_ins_rt(ifp->rt);
4225 if (ifp->idev->cnf.forwarding)
4226 addrconf_join_anycast(ifp);
4227 break;
4228 case RTM_DELADDR:
4229 if (ifp->idev->cnf.forwarding)
4230 addrconf_leave_anycast(ifp);
4231 addrconf_leave_solict(ifp->idev, &ifp->addr);
4232 dst_hold(&ifp->rt->dst);
4233
4234 if (ip6_del_rt(ifp->rt))
4235 dst_free(&ifp->rt->dst);
4236 break;
4237 }
4238 }
4239
4240 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4241 {
4242 rcu_read_lock_bh();
4243 if (likely(ifp->idev->dead == 0))
4244 __ipv6_ifa_notify(event, ifp);
4245 rcu_read_unlock_bh();
4246 }
4247
4248 #ifdef CONFIG_SYSCTL
4249
4250 static
4251 int addrconf_sysctl_forward(ctl_table *ctl, int write,
4252 void __user *buffer, size_t *lenp, loff_t *ppos)
4253 {
4254 int *valp = ctl->data;
4255 int val = *valp;
4256 loff_t pos = *ppos;
4257 ctl_table lctl;
4258 int ret;
4259
4260 /*
4261 * ctl->data points to idev->cnf.forwarding, we should
4262 * not modify it until we get the rtnl lock.
4263 */
4264 lctl = *ctl;
4265 lctl.data = &val;
4266
4267 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4268
4269 if (write)
4270 ret = addrconf_fixup_forwarding(ctl, valp, val);
4271 if (ret)
4272 *ppos = pos;
4273 return ret;
4274 }
4275
4276 static void dev_disable_change(struct inet6_dev *idev)
4277 {
4278 if (!idev || !idev->dev)
4279 return;
4280
4281 if (idev->cnf.disable_ipv6)
4282 addrconf_notify(NULL, NETDEV_DOWN, idev->dev);
4283 else
4284 addrconf_notify(NULL, NETDEV_UP, idev->dev);
4285 }
4286
4287 static void addrconf_disable_change(struct net *net, __s32 newf)
4288 {
4289 struct net_device *dev;
4290 struct inet6_dev *idev;
4291
4292 rcu_read_lock();
4293 for_each_netdev_rcu(net, dev) {
4294 idev = __in6_dev_get(dev);
4295 if (idev) {
4296 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4297 idev->cnf.disable_ipv6 = newf;
4298 if (changed)
4299 dev_disable_change(idev);
4300 }
4301 }
4302 rcu_read_unlock();
4303 }
4304
4305 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
4306 {
4307 struct net *net;
4308 int old;
4309
4310 if (!rtnl_trylock())
4311 return restart_syscall();
4312
4313 net = (struct net *)table->extra2;
4314 old = *p;
4315 *p = newf;
4316
4317 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
4318 rtnl_unlock();
4319 return 0;
4320 }
4321
4322 if (p == &net->ipv6.devconf_all->disable_ipv6) {
4323 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4324 addrconf_disable_change(net, newf);
4325 } else if ((!newf) ^ (!old))
4326 dev_disable_change((struct inet6_dev *)table->extra1);
4327
4328 rtnl_unlock();
4329 return 0;
4330 }
4331
4332 static
4333 int addrconf_sysctl_disable(ctl_table *ctl, int write,
4334 void __user *buffer, size_t *lenp, loff_t *ppos)
4335 {
4336 int *valp = ctl->data;
4337 int val = *valp;
4338 loff_t pos = *ppos;
4339 ctl_table lctl;
4340 int ret;
4341
4342 /*
4343 * ctl->data points to idev->cnf.disable_ipv6, we should
4344 * not modify it until we get the rtnl lock.
4345 */
4346 lctl = *ctl;
4347 lctl.data = &val;
4348
4349 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4350
4351 if (write)
4352 ret = addrconf_disable_ipv6(ctl, valp, val);
4353 if (ret)
4354 *ppos = pos;
4355 return ret;
4356 }
4357
4358 static struct addrconf_sysctl_table
4359 {
4360 struct ctl_table_header *sysctl_header;
4361 ctl_table addrconf_vars[DEVCONF_MAX+1];
4362 } addrconf_sysctl __read_mostly = {
4363 .sysctl_header = NULL,
4364 .addrconf_vars = {
4365 {
4366 .procname = "forwarding",
4367 .data = &ipv6_devconf.forwarding,
4368 .maxlen = sizeof(int),
4369 .mode = 0644,
4370 .proc_handler = addrconf_sysctl_forward,
4371 },
4372 {
4373 .procname = "hop_limit",
4374 .data = &ipv6_devconf.hop_limit,
4375 .maxlen = sizeof(int),
4376 .mode = 0644,
4377 .proc_handler = proc_dointvec,
4378 },
4379 {
4380 .procname = "mtu",
4381 .data = &ipv6_devconf.mtu6,
4382 .maxlen = sizeof(int),
4383 .mode = 0644,
4384 .proc_handler = proc_dointvec,
4385 },
4386 {
4387 .procname = "accept_ra",
4388 .data = &ipv6_devconf.accept_ra,
4389 .maxlen = sizeof(int),
4390 .mode = 0644,
4391 .proc_handler = proc_dointvec,
4392 },
4393 {
4394 .procname = "accept_redirects",
4395 .data = &ipv6_devconf.accept_redirects,
4396 .maxlen = sizeof(int),
4397 .mode = 0644,
4398 .proc_handler = proc_dointvec,
4399 },
4400 {
4401 .procname = "autoconf",
4402 .data = &ipv6_devconf.autoconf,
4403 .maxlen = sizeof(int),
4404 .mode = 0644,
4405 .proc_handler = proc_dointvec,
4406 },
4407 {
4408 .procname = "dad_transmits",
4409 .data = &ipv6_devconf.dad_transmits,
4410 .maxlen = sizeof(int),
4411 .mode = 0644,
4412 .proc_handler = proc_dointvec,
4413 },
4414 {
4415 .procname = "router_solicitations",
4416 .data = &ipv6_devconf.rtr_solicits,
4417 .maxlen = sizeof(int),
4418 .mode = 0644,
4419 .proc_handler = proc_dointvec,
4420 },
4421 {
4422 .procname = "router_solicitation_interval",
4423 .data = &ipv6_devconf.rtr_solicit_interval,
4424 .maxlen = sizeof(int),
4425 .mode = 0644,
4426 .proc_handler = proc_dointvec_jiffies,
4427 },
4428 {
4429 .procname = "router_solicitation_delay",
4430 .data = &ipv6_devconf.rtr_solicit_delay,
4431 .maxlen = sizeof(int),
4432 .mode = 0644,
4433 .proc_handler = proc_dointvec_jiffies,
4434 },
4435 {
4436 .procname = "force_mld_version",
4437 .data = &ipv6_devconf.force_mld_version,
4438 .maxlen = sizeof(int),
4439 .mode = 0644,
4440 .proc_handler = proc_dointvec,
4441 },
4442 #ifdef CONFIG_IPV6_PRIVACY
4443 {
4444 .procname = "use_tempaddr",
4445 .data = &ipv6_devconf.use_tempaddr,
4446 .maxlen = sizeof(int),
4447 .mode = 0644,
4448 .proc_handler = proc_dointvec,
4449 },
4450 {
4451 .procname = "temp_valid_lft",
4452 .data = &ipv6_devconf.temp_valid_lft,
4453 .maxlen = sizeof(int),
4454 .mode = 0644,
4455 .proc_handler = proc_dointvec,
4456 },
4457 {
4458 .procname = "temp_prefered_lft",
4459 .data = &ipv6_devconf.temp_prefered_lft,
4460 .maxlen = sizeof(int),
4461 .mode = 0644,
4462 .proc_handler = proc_dointvec,
4463 },
4464 {
4465 .procname = "regen_max_retry",
4466 .data = &ipv6_devconf.regen_max_retry,
4467 .maxlen = sizeof(int),
4468 .mode = 0644,
4469 .proc_handler = proc_dointvec,
4470 },
4471 {
4472 .procname = "max_desync_factor",
4473 .data = &ipv6_devconf.max_desync_factor,
4474 .maxlen = sizeof(int),
4475 .mode = 0644,
4476 .proc_handler = proc_dointvec,
4477 },
4478 #endif
4479 {
4480 .procname = "max_addresses",
4481 .data = &ipv6_devconf.max_addresses,
4482 .maxlen = sizeof(int),
4483 .mode = 0644,
4484 .proc_handler = proc_dointvec,
4485 },
4486 {
4487 .procname = "accept_ra_defrtr",
4488 .data = &ipv6_devconf.accept_ra_defrtr,
4489 .maxlen = sizeof(int),
4490 .mode = 0644,
4491 .proc_handler = proc_dointvec,
4492 },
4493 {
4494 .procname = "accept_ra_pinfo",
4495 .data = &ipv6_devconf.accept_ra_pinfo,
4496 .maxlen = sizeof(int),
4497 .mode = 0644,
4498 .proc_handler = proc_dointvec,
4499 },
4500 #ifdef CONFIG_IPV6_ROUTER_PREF
4501 {
4502 .procname = "accept_ra_rtr_pref",
4503 .data = &ipv6_devconf.accept_ra_rtr_pref,
4504 .maxlen = sizeof(int),
4505 .mode = 0644,
4506 .proc_handler = proc_dointvec,
4507 },
4508 {
4509 .procname = "router_probe_interval",
4510 .data = &ipv6_devconf.rtr_probe_interval,
4511 .maxlen = sizeof(int),
4512 .mode = 0644,
4513 .proc_handler = proc_dointvec_jiffies,
4514 },
4515 #ifdef CONFIG_IPV6_ROUTE_INFO
4516 {
4517 .procname = "accept_ra_rt_info_max_plen",
4518 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4519 .maxlen = sizeof(int),
4520 .mode = 0644,
4521 .proc_handler = proc_dointvec,
4522 },
4523 #endif
4524 #endif
4525 {
4526 .procname = "proxy_ndp",
4527 .data = &ipv6_devconf.proxy_ndp,
4528 .maxlen = sizeof(int),
4529 .mode = 0644,
4530 .proc_handler = proc_dointvec,
4531 },
4532 {
4533 .procname = "accept_source_route",
4534 .data = &ipv6_devconf.accept_source_route,
4535 .maxlen = sizeof(int),
4536 .mode = 0644,
4537 .proc_handler = proc_dointvec,
4538 },
4539 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4540 {
4541 .procname = "optimistic_dad",
4542 .data = &ipv6_devconf.optimistic_dad,
4543 .maxlen = sizeof(int),
4544 .mode = 0644,
4545 .proc_handler = proc_dointvec,
4546
4547 },
4548 #endif
4549 #ifdef CONFIG_IPV6_MROUTE
4550 {
4551 .procname = "mc_forwarding",
4552 .data = &ipv6_devconf.mc_forwarding,
4553 .maxlen = sizeof(int),
4554 .mode = 0444,
4555 .proc_handler = proc_dointvec,
4556 },
4557 #endif
4558 {
4559 .procname = "disable_ipv6",
4560 .data = &ipv6_devconf.disable_ipv6,
4561 .maxlen = sizeof(int),
4562 .mode = 0644,
4563 .proc_handler = addrconf_sysctl_disable,
4564 },
4565 {
4566 .procname = "accept_dad",
4567 .data = &ipv6_devconf.accept_dad,
4568 .maxlen = sizeof(int),
4569 .mode = 0644,
4570 .proc_handler = proc_dointvec,
4571 },
4572 {
4573 .procname = "force_tllao",
4574 .data = &ipv6_devconf.force_tllao,
4575 .maxlen = sizeof(int),
4576 .mode = 0644,
4577 .proc_handler = proc_dointvec
4578 },
4579 {
4580 /* sentinel */
4581 }
4582 },
4583 };
4584
4585 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4586 struct inet6_dev *idev, struct ipv6_devconf *p)
4587 {
4588 int i;
4589 struct addrconf_sysctl_table *t;
4590 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
4591
4592 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4593 if (t == NULL)
4594 goto out;
4595
4596 for (i = 0; t->addrconf_vars[i].data; i++) {
4597 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
4598 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4599 t->addrconf_vars[i].extra2 = net;
4600 }
4601
4602 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
4603
4604 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
4605 if (t->sysctl_header == NULL)
4606 goto free;
4607
4608 p->sysctl = t;
4609 return 0;
4610
4611 free:
4612 kfree(t);
4613 out:
4614 return -ENOBUFS;
4615 }
4616
4617 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4618 {
4619 struct addrconf_sysctl_table *t;
4620
4621 if (p->sysctl == NULL)
4622 return;
4623
4624 t = p->sysctl;
4625 p->sysctl = NULL;
4626 unregister_net_sysctl_table(t->sysctl_header);
4627 kfree(t);
4628 }
4629
4630 static void addrconf_sysctl_register(struct inet6_dev *idev)
4631 {
4632 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
4633 &ndisc_ifinfo_sysctl_change);
4634 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
4635 idev, &idev->cnf);
4636 }
4637
4638 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
4639 {
4640 __addrconf_sysctl_unregister(&idev->cnf);
4641 neigh_sysctl_unregister(idev->nd_parms);
4642 }
4643
4644
4645 #endif
4646
4647 static int __net_init addrconf_init_net(struct net *net)
4648 {
4649 int err;
4650 struct ipv6_devconf *all, *dflt;
4651
4652 err = -ENOMEM;
4653 all = &ipv6_devconf;
4654 dflt = &ipv6_devconf_dflt;
4655
4656 if (!net_eq(net, &init_net)) {
4657 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4658 if (all == NULL)
4659 goto err_alloc_all;
4660
4661 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4662 if (dflt == NULL)
4663 goto err_alloc_dflt;
4664 } else {
4665 /* these will be inherited by all namespaces */
4666 dflt->autoconf = ipv6_defaults.autoconf;
4667 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
4668 }
4669
4670 net->ipv6.devconf_all = all;
4671 net->ipv6.devconf_dflt = dflt;
4672
4673 #ifdef CONFIG_SYSCTL
4674 err = __addrconf_sysctl_register(net, "all", NULL, all);
4675 if (err < 0)
4676 goto err_reg_all;
4677
4678 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
4679 if (err < 0)
4680 goto err_reg_dflt;
4681 #endif
4682 return 0;
4683
4684 #ifdef CONFIG_SYSCTL
4685 err_reg_dflt:
4686 __addrconf_sysctl_unregister(all);
4687 err_reg_all:
4688 kfree(dflt);
4689 #endif
4690 err_alloc_dflt:
4691 kfree(all);
4692 err_alloc_all:
4693 return err;
4694 }
4695
4696 static void __net_exit addrconf_exit_net(struct net *net)
4697 {
4698 #ifdef CONFIG_SYSCTL
4699 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4700 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4701 #endif
4702 if (!net_eq(net, &init_net)) {
4703 kfree(net->ipv6.devconf_dflt);
4704 kfree(net->ipv6.devconf_all);
4705 }
4706 }
4707
4708 static struct pernet_operations addrconf_ops = {
4709 .init = addrconf_init_net,
4710 .exit = addrconf_exit_net,
4711 };
4712
4713 /*
4714 * Device notifier
4715 */
4716
4717 int register_inet6addr_notifier(struct notifier_block *nb)
4718 {
4719 return atomic_notifier_chain_register(&inet6addr_chain, nb);
4720 }
4721 EXPORT_SYMBOL(register_inet6addr_notifier);
4722
4723 int unregister_inet6addr_notifier(struct notifier_block *nb)
4724 {
4725 return atomic_notifier_chain_unregister(&inet6addr_chain, nb);
4726 }
4727 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4728
4729 static struct rtnl_af_ops inet6_ops = {
4730 .family = AF_INET6,
4731 .fill_link_af = inet6_fill_link_af,
4732 .get_link_af_size = inet6_get_link_af_size,
4733 };
4734
4735 /*
4736 * Init / cleanup code
4737 */
4738
4739 int __init addrconf_init(void)
4740 {
4741 int i, err;
4742
4743 err = ipv6_addr_label_init();
4744 if (err < 0) {
4745 pr_crit("%s: cannot initialize default policy table: %d\n",
4746 __func__, err);
4747 goto out;
4748 }
4749
4750 err = register_pernet_subsys(&addrconf_ops);
4751 if (err < 0)
4752 goto out_addrlabel;
4753
4754 /* The addrconf netdev notifier requires that loopback_dev
4755 * has it's ipv6 private information allocated and setup
4756 * before it can bring up and give link-local addresses
4757 * to other devices which are up.
4758 *
4759 * Unfortunately, loopback_dev is not necessarily the first
4760 * entry in the global dev_base list of net devices. In fact,
4761 * it is likely to be the very last entry on that list.
4762 * So this causes the notifier registry below to try and
4763 * give link-local addresses to all devices besides loopback_dev
4764 * first, then loopback_dev, which cases all the non-loopback_dev
4765 * devices to fail to get a link-local address.
4766 *
4767 * So, as a temporary fix, allocate the ipv6 structure for
4768 * loopback_dev first by hand.
4769 * Longer term, all of the dependencies ipv6 has upon the loopback
4770 * device and it being up should be removed.
4771 */
4772 rtnl_lock();
4773 if (!ipv6_add_dev(init_net.loopback_dev))
4774 err = -ENOMEM;
4775 rtnl_unlock();
4776 if (err)
4777 goto errlo;
4778
4779 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4780 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
4781
4782 register_netdevice_notifier(&ipv6_dev_notf);
4783
4784 addrconf_verify(0);
4785
4786 err = rtnl_af_register(&inet6_ops);
4787 if (err < 0)
4788 goto errout_af;
4789
4790 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
4791 NULL);
4792 if (err < 0)
4793 goto errout;
4794
4795 /* Only the first call to __rtnl_register can fail */
4796 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
4797 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
4798 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
4799 inet6_dump_ifaddr, NULL);
4800 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
4801 inet6_dump_ifmcaddr, NULL);
4802 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
4803 inet6_dump_ifacaddr, NULL);
4804
4805 ipv6_addr_label_rtnl_register();
4806
4807 return 0;
4808 errout:
4809 rtnl_af_unregister(&inet6_ops);
4810 errout_af:
4811 unregister_netdevice_notifier(&ipv6_dev_notf);
4812 errlo:
4813 unregister_pernet_subsys(&addrconf_ops);
4814 out_addrlabel:
4815 ipv6_addr_label_cleanup();
4816 out:
4817 return err;
4818 }
4819
4820 void addrconf_cleanup(void)
4821 {
4822 struct net_device *dev;
4823 int i;
4824
4825 unregister_netdevice_notifier(&ipv6_dev_notf);
4826 unregister_pernet_subsys(&addrconf_ops);
4827 ipv6_addr_label_cleanup();
4828
4829 rtnl_lock();
4830
4831 __rtnl_af_unregister(&inet6_ops);
4832
4833 /* clean dev list */
4834 for_each_netdev(&init_net, dev) {
4835 if (__in6_dev_get(dev) == NULL)
4836 continue;
4837 addrconf_ifdown(dev, 1);
4838 }
4839 addrconf_ifdown(init_net.loopback_dev, 2);
4840
4841 /*
4842 * Check hash table.
4843 */
4844 spin_lock_bh(&addrconf_hash_lock);
4845 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4846 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
4847 spin_unlock_bh(&addrconf_hash_lock);
4848
4849 del_timer(&addr_chk_timer);
4850 rtnl_unlock();
4851 }
kernel source for telekom puls (alcatel/mediatek)