xref: /openbmc/linux/net/ipv6/addrconf.c (revision b6dcefde)
1 /*
2  *	IPv6 Address [auto]configuration
3  *	Linux INET6 implementation
4  *
5  *	Authors:
6  *	Pedro Roque		<roque@di.fc.ul.pt>
7  *	Alexey Kuznetsov	<kuznet@ms2.inr.ac.ru>
8  *
9  *	This program is free software; you can redistribute it and/or
10  *      modify it under the terms of the GNU General Public License
11  *      as published by the Free Software Foundation; either version
12  *      2 of the License, or (at your option) any later version.
13  */
14 
15 /*
16  *	Changes:
17  *
18  *	Janos Farkas			:	delete timer on ifdown
19  *	<chexum@bankinf.banki.hu>
20  *	Andi Kleen			:	kill double kfree on module
21  *						unload.
22  *	Maciej W. Rozycki		:	FDDI support
23  *	sekiya@USAGI			:	Don't send too many RS
24  *						packets.
25  *	yoshfuji@USAGI			:       Fixed interval between DAD
26  *						packets.
27  *	YOSHIFUJI Hideaki @USAGI	:	improved accuracy of
28  *						address validation timer.
29  *	YOSHIFUJI Hideaki @USAGI	:	Privacy Extensions (RFC3041)
30  *						support.
31  *	Yuji SEKIYA @USAGI		:	Don't assign a same IPv6
32  *						address on a same interface.
33  *	YOSHIFUJI Hideaki @USAGI	:	ARCnet support
34  *	YOSHIFUJI Hideaki @USAGI	:	convert /proc/net/if_inet6 to
35  *						seq_file.
36  *	YOSHIFUJI Hideaki @USAGI	:	improved source address
37  *						selection; consider scope,
38  *						status etc.
39  */
40 
41 #include <linux/errno.h>
42 #include <linux/types.h>
43 #include <linux/kernel.h>
44 #include <linux/socket.h>
45 #include <linux/sockios.h>
46 #include <linux/net.h>
47 #include <linux/in6.h>
48 #include <linux/netdevice.h>
49 #include <linux/if_addr.h>
50 #include <linux/if_arp.h>
51 #include <linux/if_arcnet.h>
52 #include <linux/if_infiniband.h>
53 #include <linux/route.h>
54 #include <linux/inetdevice.h>
55 #include <linux/init.h>
56 #ifdef CONFIG_SYSCTL
57 #include <linux/sysctl.h>
58 #endif
59 #include <linux/capability.h>
60 #include <linux/delay.h>
61 #include <linux/notifier.h>
62 #include <linux/string.h>
63 
64 #include <net/net_namespace.h>
65 #include <net/sock.h>
66 #include <net/snmp.h>
67 
68 #include <net/ipv6.h>
69 #include <net/protocol.h>
70 #include <net/ndisc.h>
71 #include <net/ip6_route.h>
72 #include <net/addrconf.h>
73 #include <net/tcp.h>
74 #include <net/ip.h>
75 #include <net/netlink.h>
76 #include <net/pkt_sched.h>
77 #include <linux/if_tunnel.h>
78 #include <linux/rtnetlink.h>
79 
80 #ifdef CONFIG_IPV6_PRIVACY
81 #include <linux/random.h>
82 #endif
83 
84 #include <asm/uaccess.h>
85 #include <asm/unaligned.h>
86 
87 #include <linux/proc_fs.h>
88 #include <linux/seq_file.h>
89 
90 /* Set to 3 to get tracing... */
91 #define ACONF_DEBUG 2
92 
93 #if ACONF_DEBUG >= 3
94 #define ADBG(x) printk x
95 #else
96 #define ADBG(x)
97 #endif
98 
99 #define	INFINITY_LIFE_TIME	0xFFFFFFFF
100 #define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b)))
101 
102 #ifdef CONFIG_SYSCTL
103 static void addrconf_sysctl_register(struct inet6_dev *idev);
104 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
105 #else
106 static inline void addrconf_sysctl_register(struct inet6_dev *idev)
107 {
108 }
109 
110 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
111 {
112 }
113 #endif
114 
115 #ifdef CONFIG_IPV6_PRIVACY
116 static int __ipv6_regen_rndid(struct inet6_dev *idev);
117 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
118 static void ipv6_regen_rndid(unsigned long data);
119 
120 static int desync_factor = MAX_DESYNC_FACTOR * HZ;
121 #endif
122 
123 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
124 static int ipv6_count_addresses(struct inet6_dev *idev);
125 
126 /*
127  *	Configured unicast address hash table
128  */
129 static struct inet6_ifaddr		*inet6_addr_lst[IN6_ADDR_HSIZE];
130 static DEFINE_RWLOCK(addrconf_hash_lock);
131 
132 static void addrconf_verify(unsigned long);
133 
134 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
135 static DEFINE_SPINLOCK(addrconf_verify_lock);
136 
137 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
138 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
139 
140 static void addrconf_bonding_change(struct net_device *dev,
141 				    unsigned long event);
142 static int addrconf_ifdown(struct net_device *dev, int how);
143 
144 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
145 static void addrconf_dad_timer(unsigned long data);
146 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
147 static void addrconf_dad_run(struct inet6_dev *idev);
148 static void addrconf_rs_timer(unsigned long data);
149 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
150 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
151 
152 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
153 				struct prefix_info *pinfo);
154 static int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
155 			      struct net_device *dev);
156 
157 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
158 
159 static struct ipv6_devconf ipv6_devconf __read_mostly = {
160 	.forwarding		= 0,
161 	.hop_limit		= IPV6_DEFAULT_HOPLIMIT,
162 	.mtu6			= IPV6_MIN_MTU,
163 	.accept_ra		= 1,
164 	.accept_redirects	= 1,
165 	.autoconf		= 1,
166 	.force_mld_version	= 0,
167 	.dad_transmits		= 1,
168 	.rtr_solicits		= MAX_RTR_SOLICITATIONS,
169 	.rtr_solicit_interval	= RTR_SOLICITATION_INTERVAL,
170 	.rtr_solicit_delay	= MAX_RTR_SOLICITATION_DELAY,
171 #ifdef CONFIG_IPV6_PRIVACY
172 	.use_tempaddr 		= 0,
173 	.temp_valid_lft		= TEMP_VALID_LIFETIME,
174 	.temp_prefered_lft	= TEMP_PREFERRED_LIFETIME,
175 	.regen_max_retry	= REGEN_MAX_RETRY,
176 	.max_desync_factor	= MAX_DESYNC_FACTOR,
177 #endif
178 	.max_addresses		= IPV6_MAX_ADDRESSES,
179 	.accept_ra_defrtr	= 1,
180 	.accept_ra_pinfo	= 1,
181 #ifdef CONFIG_IPV6_ROUTER_PREF
182 	.accept_ra_rtr_pref	= 1,
183 	.rtr_probe_interval	= 60 * HZ,
184 #ifdef CONFIG_IPV6_ROUTE_INFO
185 	.accept_ra_rt_info_max_plen = 0,
186 #endif
187 #endif
188 	.proxy_ndp		= 0,
189 	.accept_source_route	= 0,	/* we do not accept RH0 by default. */
190 	.disable_ipv6		= 0,
191 	.accept_dad		= 1,
192 };
193 
194 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
195 	.forwarding		= 0,
196 	.hop_limit		= IPV6_DEFAULT_HOPLIMIT,
197 	.mtu6			= IPV6_MIN_MTU,
198 	.accept_ra		= 1,
199 	.accept_redirects	= 1,
200 	.autoconf		= 1,
201 	.dad_transmits		= 1,
202 	.rtr_solicits		= MAX_RTR_SOLICITATIONS,
203 	.rtr_solicit_interval	= RTR_SOLICITATION_INTERVAL,
204 	.rtr_solicit_delay	= MAX_RTR_SOLICITATION_DELAY,
205 #ifdef CONFIG_IPV6_PRIVACY
206 	.use_tempaddr		= 0,
207 	.temp_valid_lft		= TEMP_VALID_LIFETIME,
208 	.temp_prefered_lft	= TEMP_PREFERRED_LIFETIME,
209 	.regen_max_retry	= REGEN_MAX_RETRY,
210 	.max_desync_factor	= MAX_DESYNC_FACTOR,
211 #endif
212 	.max_addresses		= IPV6_MAX_ADDRESSES,
213 	.accept_ra_defrtr	= 1,
214 	.accept_ra_pinfo	= 1,
215 #ifdef CONFIG_IPV6_ROUTER_PREF
216 	.accept_ra_rtr_pref	= 1,
217 	.rtr_probe_interval	= 60 * HZ,
218 #ifdef CONFIG_IPV6_ROUTE_INFO
219 	.accept_ra_rt_info_max_plen = 0,
220 #endif
221 #endif
222 	.proxy_ndp		= 0,
223 	.accept_source_route	= 0,	/* we do not accept RH0 by default. */
224 	.disable_ipv6		= 0,
225 	.accept_dad		= 1,
226 };
227 
228 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
229 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
230 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
231 const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
232 const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
233 
234 /* Check if a valid qdisc is available */
235 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
236 {
237 	return !qdisc_tx_is_noop(dev);
238 }
239 
240 /* Check if a route is valid prefix route */
241 static inline int addrconf_is_prefix_route(const struct rt6_info *rt)
242 {
243 	return ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0);
244 }
245 
246 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
247 {
248 	if (del_timer(&ifp->timer))
249 		__in6_ifa_put(ifp);
250 }
251 
252 enum addrconf_timer_t
253 {
254 	AC_NONE,
255 	AC_DAD,
256 	AC_RS,
257 };
258 
259 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
260 			       enum addrconf_timer_t what,
261 			       unsigned long when)
262 {
263 	if (!del_timer(&ifp->timer))
264 		in6_ifa_hold(ifp);
265 
266 	switch (what) {
267 	case AC_DAD:
268 		ifp->timer.function = addrconf_dad_timer;
269 		break;
270 	case AC_RS:
271 		ifp->timer.function = addrconf_rs_timer;
272 		break;
273 	default:;
274 	}
275 	ifp->timer.expires = jiffies + when;
276 	add_timer(&ifp->timer);
277 }
278 
279 static int snmp6_alloc_dev(struct inet6_dev *idev)
280 {
281 	if (snmp_mib_init((void **)idev->stats.ipv6,
282 			  sizeof(struct ipstats_mib)) < 0)
283 		goto err_ip;
284 	if (snmp_mib_init((void **)idev->stats.icmpv6,
285 			  sizeof(struct icmpv6_mib)) < 0)
286 		goto err_icmp;
287 	if (snmp_mib_init((void **)idev->stats.icmpv6msg,
288 			  sizeof(struct icmpv6msg_mib)) < 0)
289 		goto err_icmpmsg;
290 
291 	return 0;
292 
293 err_icmpmsg:
294 	snmp_mib_free((void **)idev->stats.icmpv6);
295 err_icmp:
296 	snmp_mib_free((void **)idev->stats.ipv6);
297 err_ip:
298 	return -ENOMEM;
299 }
300 
301 static void snmp6_free_dev(struct inet6_dev *idev)
302 {
303 	snmp_mib_free((void **)idev->stats.icmpv6msg);
304 	snmp_mib_free((void **)idev->stats.icmpv6);
305 	snmp_mib_free((void **)idev->stats.ipv6);
306 }
307 
308 /* Nobody refers to this device, we may destroy it. */
309 
310 static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
311 {
312 	struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
313 	kfree(idev);
314 }
315 
316 void in6_dev_finish_destroy(struct inet6_dev *idev)
317 {
318 	struct net_device *dev = idev->dev;
319 
320 	WARN_ON(idev->addr_list != NULL);
321 	WARN_ON(idev->mc_list != NULL);
322 
323 #ifdef NET_REFCNT_DEBUG
324 	printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
325 #endif
326 	dev_put(dev);
327 	if (!idev->dead) {
328 		printk("Freeing alive inet6 device %p\n", idev);
329 		return;
330 	}
331 	snmp6_free_dev(idev);
332 	call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
333 }
334 
335 EXPORT_SYMBOL(in6_dev_finish_destroy);
336 
337 static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
338 {
339 	struct inet6_dev *ndev;
340 
341 	ASSERT_RTNL();
342 
343 	if (dev->mtu < IPV6_MIN_MTU)
344 		return NULL;
345 
346 	ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
347 
348 	if (ndev == NULL)
349 		return NULL;
350 
351 	rwlock_init(&ndev->lock);
352 	ndev->dev = dev;
353 	memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
354 	ndev->cnf.mtu6 = dev->mtu;
355 	ndev->cnf.sysctl = NULL;
356 	ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
357 	if (ndev->nd_parms == NULL) {
358 		kfree(ndev);
359 		return NULL;
360 	}
361 	if (ndev->cnf.forwarding)
362 		dev_disable_lro(dev);
363 	/* We refer to the device */
364 	dev_hold(dev);
365 
366 	if (snmp6_alloc_dev(ndev) < 0) {
367 		ADBG((KERN_WARNING
368 			"%s(): cannot allocate memory for statistics; dev=%s.\n",
369 			__func__, dev->name));
370 		neigh_parms_release(&nd_tbl, ndev->nd_parms);
371 		ndev->dead = 1;
372 		in6_dev_finish_destroy(ndev);
373 		return NULL;
374 	}
375 
376 	if (snmp6_register_dev(ndev) < 0) {
377 		ADBG((KERN_WARNING
378 			"%s(): cannot create /proc/net/dev_snmp6/%s\n",
379 			__func__, dev->name));
380 		neigh_parms_release(&nd_tbl, ndev->nd_parms);
381 		ndev->dead = 1;
382 		in6_dev_finish_destroy(ndev);
383 		return NULL;
384 	}
385 
386 	/* One reference from device.  We must do this before
387 	 * we invoke __ipv6_regen_rndid().
388 	 */
389 	in6_dev_hold(ndev);
390 
391 	if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
392 		ndev->cnf.accept_dad = -1;
393 
394 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
395 	if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
396 		printk(KERN_INFO
397 		       "%s: Disabled Multicast RS\n",
398 		       dev->name);
399 		ndev->cnf.rtr_solicits = 0;
400 	}
401 #endif
402 
403 #ifdef CONFIG_IPV6_PRIVACY
404 	setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
405 	if ((dev->flags&IFF_LOOPBACK) ||
406 	    dev->type == ARPHRD_TUNNEL ||
407 	    dev->type == ARPHRD_TUNNEL6 ||
408 	    dev->type == ARPHRD_SIT ||
409 	    dev->type == ARPHRD_NONE) {
410 		printk(KERN_INFO
411 		       "%s: Disabled Privacy Extensions\n",
412 		       dev->name);
413 		ndev->cnf.use_tempaddr = -1;
414 	} else {
415 		in6_dev_hold(ndev);
416 		ipv6_regen_rndid((unsigned long) ndev);
417 	}
418 #endif
419 
420 	if (netif_running(dev) && addrconf_qdisc_ok(dev))
421 		ndev->if_flags |= IF_READY;
422 
423 	ipv6_mc_init_dev(ndev);
424 	ndev->tstamp = jiffies;
425 	addrconf_sysctl_register(ndev);
426 	/* protected by rtnl_lock */
427 	rcu_assign_pointer(dev->ip6_ptr, ndev);
428 
429 	/* Join all-node multicast group */
430 	ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
431 
432 	return ndev;
433 }
434 
435 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
436 {
437 	struct inet6_dev *idev;
438 
439 	ASSERT_RTNL();
440 
441 	if ((idev = __in6_dev_get(dev)) == NULL) {
442 		if ((idev = ipv6_add_dev(dev)) == NULL)
443 			return NULL;
444 	}
445 
446 	if (dev->flags&IFF_UP)
447 		ipv6_mc_up(idev);
448 	return idev;
449 }
450 
451 #ifdef CONFIG_SYSCTL
452 static void dev_forward_change(struct inet6_dev *idev)
453 {
454 	struct net_device *dev;
455 	struct inet6_ifaddr *ifa;
456 
457 	if (!idev)
458 		return;
459 	dev = idev->dev;
460 	if (idev->cnf.forwarding)
461 		dev_disable_lro(dev);
462 	if (dev && (dev->flags & IFF_MULTICAST)) {
463 		if (idev->cnf.forwarding)
464 			ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
465 		else
466 			ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
467 	}
468 	for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
469 		if (ifa->flags&IFA_F_TENTATIVE)
470 			continue;
471 		if (idev->cnf.forwarding)
472 			addrconf_join_anycast(ifa);
473 		else
474 			addrconf_leave_anycast(ifa);
475 	}
476 }
477 
478 
479 static void addrconf_forward_change(struct net *net, __s32 newf)
480 {
481 	struct net_device *dev;
482 	struct inet6_dev *idev;
483 
484 	rcu_read_lock();
485 	for_each_netdev_rcu(net, dev) {
486 		idev = __in6_dev_get(dev);
487 		if (idev) {
488 			int changed = (!idev->cnf.forwarding) ^ (!newf);
489 			idev->cnf.forwarding = newf;
490 			if (changed)
491 				dev_forward_change(idev);
492 		}
493 	}
494 	rcu_read_unlock();
495 }
496 
497 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old)
498 {
499 	struct net *net;
500 
501 	net = (struct net *)table->extra2;
502 	if (p == &net->ipv6.devconf_dflt->forwarding)
503 		return 0;
504 
505 	if (!rtnl_trylock()) {
506 		/* Restore the original values before restarting */
507 		*p = old;
508 		return restart_syscall();
509 	}
510 
511 	if (p == &net->ipv6.devconf_all->forwarding) {
512 		__s32 newf = net->ipv6.devconf_all->forwarding;
513 		net->ipv6.devconf_dflt->forwarding = newf;
514 		addrconf_forward_change(net, newf);
515 	} else if ((!*p) ^ (!old))
516 		dev_forward_change((struct inet6_dev *)table->extra1);
517 	rtnl_unlock();
518 
519 	if (*p)
520 		rt6_purge_dflt_routers(net);
521 	return 1;
522 }
523 #endif
524 
525 /* Nobody refers to this ifaddr, destroy it */
526 
527 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
528 {
529 	WARN_ON(ifp->if_next != NULL);
530 	WARN_ON(ifp->lst_next != NULL);
531 
532 #ifdef NET_REFCNT_DEBUG
533 	printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
534 #endif
535 
536 	in6_dev_put(ifp->idev);
537 
538 	if (del_timer(&ifp->timer))
539 		printk("Timer is still running, when freeing ifa=%p\n", ifp);
540 
541 	if (!ifp->dead) {
542 		printk("Freeing alive inet6 address %p\n", ifp);
543 		return;
544 	}
545 	dst_release(&ifp->rt->u.dst);
546 
547 	kfree(ifp);
548 }
549 
550 static void
551 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
552 {
553 	struct inet6_ifaddr *ifa, **ifap;
554 	int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
555 
556 	/*
557 	 * Each device address list is sorted in order of scope -
558 	 * global before linklocal.
559 	 */
560 	for (ifap = &idev->addr_list; (ifa = *ifap) != NULL;
561 	     ifap = &ifa->if_next) {
562 		if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
563 			break;
564 	}
565 
566 	ifp->if_next = *ifap;
567 	*ifap = ifp;
568 }
569 
570 /*
571  *	Hash function taken from net_alias.c
572  */
573 static u8 ipv6_addr_hash(const struct in6_addr *addr)
574 {
575 	__u32 word;
576 
577 	/*
578 	 * We perform the hash function over the last 64 bits of the address
579 	 * This will include the IEEE address token on links that support it.
580 	 */
581 
582 	word = (__force u32)(addr->s6_addr32[2] ^ addr->s6_addr32[3]);
583 	word ^= (word >> 16);
584 	word ^= (word >> 8);
585 
586 	return ((word ^ (word >> 4)) & 0x0f);
587 }
588 
589 /* On success it returns ifp with increased reference count */
590 
591 static struct inet6_ifaddr *
592 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
593 	      int scope, u32 flags)
594 {
595 	struct inet6_ifaddr *ifa = NULL;
596 	struct rt6_info *rt;
597 	int hash;
598 	int err = 0;
599 	int addr_type = ipv6_addr_type(addr);
600 
601 	if (addr_type == IPV6_ADDR_ANY ||
602 	    addr_type & IPV6_ADDR_MULTICAST ||
603 	    (!(idev->dev->flags & IFF_LOOPBACK) &&
604 	     addr_type & IPV6_ADDR_LOOPBACK))
605 		return ERR_PTR(-EADDRNOTAVAIL);
606 
607 	rcu_read_lock_bh();
608 	if (idev->dead) {
609 		err = -ENODEV;			/*XXX*/
610 		goto out2;
611 	}
612 
613 	if (idev->cnf.disable_ipv6) {
614 		err = -EACCES;
615 		goto out2;
616 	}
617 
618 	write_lock(&addrconf_hash_lock);
619 
620 	/* Ignore adding duplicate addresses on an interface */
621 	if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
622 		ADBG(("ipv6_add_addr: already assigned\n"));
623 		err = -EEXIST;
624 		goto out;
625 	}
626 
627 	ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
628 
629 	if (ifa == NULL) {
630 		ADBG(("ipv6_add_addr: malloc failed\n"));
631 		err = -ENOBUFS;
632 		goto out;
633 	}
634 
635 	rt = addrconf_dst_alloc(idev, addr, 0);
636 	if (IS_ERR(rt)) {
637 		err = PTR_ERR(rt);
638 		goto out;
639 	}
640 
641 	ipv6_addr_copy(&ifa->addr, addr);
642 
643 	spin_lock_init(&ifa->lock);
644 	init_timer(&ifa->timer);
645 	ifa->timer.data = (unsigned long) ifa;
646 	ifa->scope = scope;
647 	ifa->prefix_len = pfxlen;
648 	ifa->flags = flags | IFA_F_TENTATIVE;
649 	ifa->cstamp = ifa->tstamp = jiffies;
650 
651 	ifa->rt = rt;
652 
653 	/*
654 	 * part one of RFC 4429, section 3.3
655 	 * We should not configure an address as
656 	 * optimistic if we do not yet know the link
657 	 * layer address of our nexhop router
658 	 */
659 
660 	if (rt->rt6i_nexthop == NULL)
661 		ifa->flags &= ~IFA_F_OPTIMISTIC;
662 
663 	ifa->idev = idev;
664 	in6_dev_hold(idev);
665 	/* For caller */
666 	in6_ifa_hold(ifa);
667 
668 	/* Add to big hash table */
669 	hash = ipv6_addr_hash(addr);
670 
671 	ifa->lst_next = inet6_addr_lst[hash];
672 	inet6_addr_lst[hash] = ifa;
673 	in6_ifa_hold(ifa);
674 	write_unlock(&addrconf_hash_lock);
675 
676 	write_lock(&idev->lock);
677 	/* Add to inet6_dev unicast addr list. */
678 	ipv6_link_dev_addr(idev, ifa);
679 
680 #ifdef CONFIG_IPV6_PRIVACY
681 	if (ifa->flags&IFA_F_TEMPORARY) {
682 		ifa->tmp_next = idev->tempaddr_list;
683 		idev->tempaddr_list = ifa;
684 		in6_ifa_hold(ifa);
685 	}
686 #endif
687 
688 	in6_ifa_hold(ifa);
689 	write_unlock(&idev->lock);
690 out2:
691 	rcu_read_unlock_bh();
692 
693 	if (likely(err == 0))
694 		atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
695 	else {
696 		kfree(ifa);
697 		ifa = ERR_PTR(err);
698 	}
699 
700 	return ifa;
701 out:
702 	write_unlock(&addrconf_hash_lock);
703 	goto out2;
704 }
705 
706 /* This function wants to get referenced ifp and releases it before return */
707 
708 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
709 {
710 	struct inet6_ifaddr *ifa, **ifap;
711 	struct inet6_dev *idev = ifp->idev;
712 	int hash;
713 	int deleted = 0, onlink = 0;
714 	unsigned long expires = jiffies;
715 
716 	hash = ipv6_addr_hash(&ifp->addr);
717 
718 	ifp->dead = 1;
719 
720 	write_lock_bh(&addrconf_hash_lock);
721 	for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
722 	     ifap = &ifa->lst_next) {
723 		if (ifa == ifp) {
724 			*ifap = ifa->lst_next;
725 			__in6_ifa_put(ifp);
726 			ifa->lst_next = NULL;
727 			break;
728 		}
729 	}
730 	write_unlock_bh(&addrconf_hash_lock);
731 
732 	write_lock_bh(&idev->lock);
733 #ifdef CONFIG_IPV6_PRIVACY
734 	if (ifp->flags&IFA_F_TEMPORARY) {
735 		for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
736 		     ifap = &ifa->tmp_next) {
737 			if (ifa == ifp) {
738 				*ifap = ifa->tmp_next;
739 				if (ifp->ifpub) {
740 					in6_ifa_put(ifp->ifpub);
741 					ifp->ifpub = NULL;
742 				}
743 				__in6_ifa_put(ifp);
744 				ifa->tmp_next = NULL;
745 				break;
746 			}
747 		}
748 	}
749 #endif
750 
751 	for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
752 		if (ifa == ifp) {
753 			*ifap = ifa->if_next;
754 			__in6_ifa_put(ifp);
755 			ifa->if_next = NULL;
756 			if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
757 				break;
758 			deleted = 1;
759 			continue;
760 		} else if (ifp->flags & IFA_F_PERMANENT) {
761 			if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
762 					      ifp->prefix_len)) {
763 				if (ifa->flags & IFA_F_PERMANENT) {
764 					onlink = 1;
765 					if (deleted)
766 						break;
767 				} else {
768 					unsigned long lifetime;
769 
770 					if (!onlink)
771 						onlink = -1;
772 
773 					spin_lock(&ifa->lock);
774 
775 					lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
776 					/*
777 					 * Note: Because this address is
778 					 * not permanent, lifetime <
779 					 * LONG_MAX / HZ here.
780 					 */
781 					if (time_before(expires,
782 							ifa->tstamp + lifetime * HZ))
783 						expires = ifa->tstamp + lifetime * HZ;
784 					spin_unlock(&ifa->lock);
785 				}
786 			}
787 		}
788 		ifap = &ifa->if_next;
789 	}
790 	write_unlock_bh(&idev->lock);
791 
792 	addrconf_del_timer(ifp);
793 
794 	ipv6_ifa_notify(RTM_DELADDR, ifp);
795 
796 	atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
797 
798 	/*
799 	 * Purge or update corresponding prefix
800 	 *
801 	 * 1) we don't purge prefix here if address was not permanent.
802 	 *    prefix is managed by its own lifetime.
803 	 * 2) if there're no addresses, delete prefix.
804 	 * 3) if there're still other permanent address(es),
805 	 *    corresponding prefix is still permanent.
806 	 * 4) otherwise, update prefix lifetime to the
807 	 *    longest valid lifetime among the corresponding
808 	 *    addresses on the device.
809 	 *    Note: subsequent RA will update lifetime.
810 	 *
811 	 * --yoshfuji
812 	 */
813 	if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
814 		struct in6_addr prefix;
815 		struct rt6_info *rt;
816 		struct net *net = dev_net(ifp->idev->dev);
817 		ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
818 		rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1);
819 
820 		if (rt && addrconf_is_prefix_route(rt)) {
821 			if (onlink == 0) {
822 				ip6_del_rt(rt);
823 				rt = NULL;
824 			} else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
825 				rt->rt6i_expires = expires;
826 				rt->rt6i_flags |= RTF_EXPIRES;
827 			}
828 		}
829 		dst_release(&rt->u.dst);
830 	}
831 
832 	in6_ifa_put(ifp);
833 }
834 
835 #ifdef CONFIG_IPV6_PRIVACY
836 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
837 {
838 	struct inet6_dev *idev = ifp->idev;
839 	struct in6_addr addr, *tmpaddr;
840 	unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
841 	unsigned long regen_advance;
842 	int tmp_plen;
843 	int ret = 0;
844 	int max_addresses;
845 	u32 addr_flags;
846 
847 	write_lock(&idev->lock);
848 	if (ift) {
849 		spin_lock_bh(&ift->lock);
850 		memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
851 		spin_unlock_bh(&ift->lock);
852 		tmpaddr = &addr;
853 	} else {
854 		tmpaddr = NULL;
855 	}
856 retry:
857 	in6_dev_hold(idev);
858 	if (idev->cnf.use_tempaddr <= 0) {
859 		write_unlock(&idev->lock);
860 		printk(KERN_INFO
861 			"ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
862 		in6_dev_put(idev);
863 		ret = -1;
864 		goto out;
865 	}
866 	spin_lock_bh(&ifp->lock);
867 	if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
868 		idev->cnf.use_tempaddr = -1;	/*XXX*/
869 		spin_unlock_bh(&ifp->lock);
870 		write_unlock(&idev->lock);
871 		printk(KERN_WARNING
872 			"ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
873 		in6_dev_put(idev);
874 		ret = -1;
875 		goto out;
876 	}
877 	in6_ifa_hold(ifp);
878 	memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
879 	if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
880 		spin_unlock_bh(&ifp->lock);
881 		write_unlock(&idev->lock);
882 		printk(KERN_WARNING
883 			"ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
884 		in6_ifa_put(ifp);
885 		in6_dev_put(idev);
886 		ret = -1;
887 		goto out;
888 	}
889 	memcpy(&addr.s6_addr[8], idev->rndid, 8);
890 	tmp_valid_lft = min_t(__u32,
891 			      ifp->valid_lft,
892 			      idev->cnf.temp_valid_lft);
893 	tmp_prefered_lft = min_t(__u32,
894 				 ifp->prefered_lft,
895 				 idev->cnf.temp_prefered_lft - desync_factor / HZ);
896 	tmp_plen = ifp->prefix_len;
897 	max_addresses = idev->cnf.max_addresses;
898 	tmp_cstamp = ifp->cstamp;
899 	tmp_tstamp = ifp->tstamp;
900 	spin_unlock_bh(&ifp->lock);
901 
902 	regen_advance = idev->cnf.regen_max_retry *
903 	                idev->cnf.dad_transmits *
904 	                idev->nd_parms->retrans_time / HZ;
905 	write_unlock(&idev->lock);
906 
907 	/* A temporary address is created only if this calculated Preferred
908 	 * Lifetime is greater than REGEN_ADVANCE time units.  In particular,
909 	 * an implementation must not create a temporary address with a zero
910 	 * Preferred Lifetime.
911 	 */
912 	if (tmp_prefered_lft <= regen_advance) {
913 		in6_ifa_put(ifp);
914 		in6_dev_put(idev);
915 		ret = -1;
916 		goto out;
917 	}
918 
919 	addr_flags = IFA_F_TEMPORARY;
920 	/* set in addrconf_prefix_rcv() */
921 	if (ifp->flags & IFA_F_OPTIMISTIC)
922 		addr_flags |= IFA_F_OPTIMISTIC;
923 
924 	ift = !max_addresses ||
925 	      ipv6_count_addresses(idev) < max_addresses ?
926 		ipv6_add_addr(idev, &addr, tmp_plen,
927 			      ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
928 			      addr_flags) : NULL;
929 	if (!ift || IS_ERR(ift)) {
930 		in6_ifa_put(ifp);
931 		in6_dev_put(idev);
932 		printk(KERN_INFO
933 			"ipv6_create_tempaddr(): retry temporary address regeneration.\n");
934 		tmpaddr = &addr;
935 		write_lock(&idev->lock);
936 		goto retry;
937 	}
938 
939 	spin_lock_bh(&ift->lock);
940 	ift->ifpub = ifp;
941 	ift->valid_lft = tmp_valid_lft;
942 	ift->prefered_lft = tmp_prefered_lft;
943 	ift->cstamp = tmp_cstamp;
944 	ift->tstamp = tmp_tstamp;
945 	spin_unlock_bh(&ift->lock);
946 
947 	addrconf_dad_start(ift, 0);
948 	in6_ifa_put(ift);
949 	in6_dev_put(idev);
950 out:
951 	return ret;
952 }
953 #endif
954 
955 /*
956  *	Choose an appropriate source address (RFC3484)
957  */
958 enum {
959 	IPV6_SADDR_RULE_INIT = 0,
960 	IPV6_SADDR_RULE_LOCAL,
961 	IPV6_SADDR_RULE_SCOPE,
962 	IPV6_SADDR_RULE_PREFERRED,
963 #ifdef CONFIG_IPV6_MIP6
964 	IPV6_SADDR_RULE_HOA,
965 #endif
966 	IPV6_SADDR_RULE_OIF,
967 	IPV6_SADDR_RULE_LABEL,
968 #ifdef CONFIG_IPV6_PRIVACY
969 	IPV6_SADDR_RULE_PRIVACY,
970 #endif
971 	IPV6_SADDR_RULE_ORCHID,
972 	IPV6_SADDR_RULE_PREFIX,
973 	IPV6_SADDR_RULE_MAX
974 };
975 
976 struct ipv6_saddr_score {
977 	int			rule;
978 	int			addr_type;
979 	struct inet6_ifaddr	*ifa;
980 	DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
981 	int			scopedist;
982 	int			matchlen;
983 };
984 
985 struct ipv6_saddr_dst {
986 	const struct in6_addr *addr;
987 	int ifindex;
988 	int scope;
989 	int label;
990 	unsigned int prefs;
991 };
992 
993 static inline int ipv6_saddr_preferred(int type)
994 {
995 	if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
996 		    IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
997 		return 1;
998 	return 0;
999 }
1000 
1001 static int ipv6_get_saddr_eval(struct net *net,
1002 			       struct ipv6_saddr_score *score,
1003 			       struct ipv6_saddr_dst *dst,
1004 			       int i)
1005 {
1006 	int ret;
1007 
1008 	if (i <= score->rule) {
1009 		switch (i) {
1010 		case IPV6_SADDR_RULE_SCOPE:
1011 			ret = score->scopedist;
1012 			break;
1013 		case IPV6_SADDR_RULE_PREFIX:
1014 			ret = score->matchlen;
1015 			break;
1016 		default:
1017 			ret = !!test_bit(i, score->scorebits);
1018 		}
1019 		goto out;
1020 	}
1021 
1022 	switch (i) {
1023 	case IPV6_SADDR_RULE_INIT:
1024 		/* Rule 0: remember if hiscore is not ready yet */
1025 		ret = !!score->ifa;
1026 		break;
1027 	case IPV6_SADDR_RULE_LOCAL:
1028 		/* Rule 1: Prefer same address */
1029 		ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1030 		break;
1031 	case IPV6_SADDR_RULE_SCOPE:
1032 		/* Rule 2: Prefer appropriate scope
1033 		 *
1034 		 *      ret
1035 		 *       ^
1036 		 *    -1 |  d 15
1037 		 *    ---+--+-+---> scope
1038 		 *       |
1039 		 *       |             d is scope of the destination.
1040 		 *  B-d  |  \
1041 		 *       |   \      <- smaller scope is better if
1042 		 *  B-15 |    \        if scope is enough for destinaion.
1043 		 *       |             ret = B - scope (-1 <= scope >= d <= 15).
1044 		 * d-C-1 | /
1045 		 *       |/         <- greater is better
1046 		 *   -C  /             if scope is not enough for destination.
1047 		 *      /|             ret = scope - C (-1 <= d < scope <= 15).
1048 		 *
1049 		 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1050 		 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1051 		 * Assume B = 0 and we get C > 29.
1052 		 */
1053 		ret = __ipv6_addr_src_scope(score->addr_type);
1054 		if (ret >= dst->scope)
1055 			ret = -ret;
1056 		else
1057 			ret -= 128;	/* 30 is enough */
1058 		score->scopedist = ret;
1059 		break;
1060 	case IPV6_SADDR_RULE_PREFERRED:
1061 		/* Rule 3: Avoid deprecated and optimistic addresses */
1062 		ret = ipv6_saddr_preferred(score->addr_type) ||
1063 		      !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1064 		break;
1065 #ifdef CONFIG_IPV6_MIP6
1066 	case IPV6_SADDR_RULE_HOA:
1067 	    {
1068 		/* Rule 4: Prefer home address */
1069 		int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1070 		ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1071 		break;
1072 	    }
1073 #endif
1074 	case IPV6_SADDR_RULE_OIF:
1075 		/* Rule 5: Prefer outgoing interface */
1076 		ret = (!dst->ifindex ||
1077 		       dst->ifindex == score->ifa->idev->dev->ifindex);
1078 		break;
1079 	case IPV6_SADDR_RULE_LABEL:
1080 		/* Rule 6: Prefer matching label */
1081 		ret = ipv6_addr_label(net,
1082 				      &score->ifa->addr, score->addr_type,
1083 				      score->ifa->idev->dev->ifindex) == dst->label;
1084 		break;
1085 #ifdef CONFIG_IPV6_PRIVACY
1086 	case IPV6_SADDR_RULE_PRIVACY:
1087 	    {
1088 		/* Rule 7: Prefer public address
1089 		 * Note: prefer temprary address if use_tempaddr >= 2
1090 		 */
1091 		int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1092 				!!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1093 				score->ifa->idev->cnf.use_tempaddr >= 2;
1094 		ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1095 		break;
1096 	    }
1097 #endif
1098 	case IPV6_SADDR_RULE_ORCHID:
1099 		/* Rule 8-: Prefer ORCHID vs ORCHID or
1100 		 *	    non-ORCHID vs non-ORCHID
1101 		 */
1102 		ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1103 			ipv6_addr_orchid(dst->addr));
1104 		break;
1105 	case IPV6_SADDR_RULE_PREFIX:
1106 		/* Rule 8: Use longest matching prefix */
1107 		score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr,
1108 						       dst->addr);
1109 		break;
1110 	default:
1111 		ret = 0;
1112 	}
1113 
1114 	if (ret)
1115 		__set_bit(i, score->scorebits);
1116 	score->rule = i;
1117 out:
1118 	return ret;
1119 }
1120 
1121 int ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev,
1122 		       const struct in6_addr *daddr, unsigned int prefs,
1123 		       struct in6_addr *saddr)
1124 {
1125 	struct ipv6_saddr_score scores[2],
1126 				*score = &scores[0], *hiscore = &scores[1];
1127 	struct ipv6_saddr_dst dst;
1128 	struct net_device *dev;
1129 	int dst_type;
1130 
1131 	dst_type = __ipv6_addr_type(daddr);
1132 	dst.addr = daddr;
1133 	dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1134 	dst.scope = __ipv6_addr_src_scope(dst_type);
1135 	dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1136 	dst.prefs = prefs;
1137 
1138 	hiscore->rule = -1;
1139 	hiscore->ifa = NULL;
1140 
1141 	rcu_read_lock();
1142 
1143 	for_each_netdev_rcu(net, dev) {
1144 		struct inet6_dev *idev;
1145 
1146 		/* Candidate Source Address (section 4)
1147 		 *  - multicast and link-local destination address,
1148 		 *    the set of candidate source address MUST only
1149 		 *    include addresses assigned to interfaces
1150 		 *    belonging to the same link as the outgoing
1151 		 *    interface.
1152 		 * (- For site-local destination addresses, the
1153 		 *    set of candidate source addresses MUST only
1154 		 *    include addresses assigned to interfaces
1155 		 *    belonging to the same site as the outgoing
1156 		 *    interface.)
1157 		 */
1158 		if (((dst_type & IPV6_ADDR_MULTICAST) ||
1159 		     dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1160 		    dst.ifindex && dev->ifindex != dst.ifindex)
1161 			continue;
1162 
1163 		idev = __in6_dev_get(dev);
1164 		if (!idev)
1165 			continue;
1166 
1167 		read_lock_bh(&idev->lock);
1168 		for (score->ifa = idev->addr_list; score->ifa; score->ifa = score->ifa->if_next) {
1169 			int i;
1170 
1171 			/*
1172 			 * - Tentative Address (RFC2462 section 5.4)
1173 			 *  - A tentative address is not considered
1174 			 *    "assigned to an interface" in the traditional
1175 			 *    sense, unless it is also flagged as optimistic.
1176 			 * - Candidate Source Address (section 4)
1177 			 *  - In any case, anycast addresses, multicast
1178 			 *    addresses, and the unspecified address MUST
1179 			 *    NOT be included in a candidate set.
1180 			 */
1181 			if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1182 			    (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1183 				continue;
1184 
1185 			score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1186 
1187 			if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1188 				     score->addr_type & IPV6_ADDR_MULTICAST)) {
1189 				LIMIT_NETDEBUG(KERN_DEBUG
1190 					       "ADDRCONF: unspecified / multicast address "
1191 					       "assigned as unicast address on %s",
1192 					       dev->name);
1193 				continue;
1194 			}
1195 
1196 			score->rule = -1;
1197 			bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1198 
1199 			for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1200 				int minihiscore, miniscore;
1201 
1202 				minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1203 				miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1204 
1205 				if (minihiscore > miniscore) {
1206 					if (i == IPV6_SADDR_RULE_SCOPE &&
1207 					    score->scopedist > 0) {
1208 						/*
1209 						 * special case:
1210 						 * each remaining entry
1211 						 * has too small (not enough)
1212 						 * scope, because ifa entries
1213 						 * are sorted by their scope
1214 						 * values.
1215 						 */
1216 						goto try_nextdev;
1217 					}
1218 					break;
1219 				} else if (minihiscore < miniscore) {
1220 					if (hiscore->ifa)
1221 						in6_ifa_put(hiscore->ifa);
1222 
1223 					in6_ifa_hold(score->ifa);
1224 
1225 					swap(hiscore, score);
1226 
1227 					/* restore our iterator */
1228 					score->ifa = hiscore->ifa;
1229 
1230 					break;
1231 				}
1232 			}
1233 		}
1234 try_nextdev:
1235 		read_unlock_bh(&idev->lock);
1236 	}
1237 	rcu_read_unlock();
1238 
1239 	if (!hiscore->ifa)
1240 		return -EADDRNOTAVAIL;
1241 
1242 	ipv6_addr_copy(saddr, &hiscore->ifa->addr);
1243 	in6_ifa_put(hiscore->ifa);
1244 	return 0;
1245 }
1246 
1247 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1248 
1249 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1250 		    unsigned char banned_flags)
1251 {
1252 	struct inet6_dev *idev;
1253 	int err = -EADDRNOTAVAIL;
1254 
1255 	rcu_read_lock();
1256 	if ((idev = __in6_dev_get(dev)) != NULL) {
1257 		struct inet6_ifaddr *ifp;
1258 
1259 		read_lock_bh(&idev->lock);
1260 		for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1261 			if (ifp->scope == IFA_LINK && !(ifp->flags & banned_flags)) {
1262 				ipv6_addr_copy(addr, &ifp->addr);
1263 				err = 0;
1264 				break;
1265 			}
1266 		}
1267 		read_unlock_bh(&idev->lock);
1268 	}
1269 	rcu_read_unlock();
1270 	return err;
1271 }
1272 
1273 static int ipv6_count_addresses(struct inet6_dev *idev)
1274 {
1275 	int cnt = 0;
1276 	struct inet6_ifaddr *ifp;
1277 
1278 	read_lock_bh(&idev->lock);
1279 	for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1280 		cnt++;
1281 	read_unlock_bh(&idev->lock);
1282 	return cnt;
1283 }
1284 
1285 int ipv6_chk_addr(struct net *net, struct in6_addr *addr,
1286 		  struct net_device *dev, int strict)
1287 {
1288 	struct inet6_ifaddr * ifp;
1289 	u8 hash = ipv6_addr_hash(addr);
1290 
1291 	read_lock_bh(&addrconf_hash_lock);
1292 	for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1293 		if (!net_eq(dev_net(ifp->idev->dev), net))
1294 			continue;
1295 		if (ipv6_addr_equal(&ifp->addr, addr) &&
1296 		    !(ifp->flags&IFA_F_TENTATIVE)) {
1297 			if (dev == NULL || ifp->idev->dev == dev ||
1298 			    !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1299 				break;
1300 		}
1301 	}
1302 	read_unlock_bh(&addrconf_hash_lock);
1303 	return ifp != NULL;
1304 }
1305 EXPORT_SYMBOL(ipv6_chk_addr);
1306 
1307 static
1308 int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1309 		       struct net_device *dev)
1310 {
1311 	struct inet6_ifaddr * ifp;
1312 	u8 hash = ipv6_addr_hash(addr);
1313 
1314 	for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1315 		if (!net_eq(dev_net(ifp->idev->dev), net))
1316 			continue;
1317 		if (ipv6_addr_equal(&ifp->addr, addr)) {
1318 			if (dev == NULL || ifp->idev->dev == dev)
1319 				break;
1320 		}
1321 	}
1322 	return ifp != NULL;
1323 }
1324 
1325 int ipv6_chk_prefix(struct in6_addr *addr, struct net_device *dev)
1326 {
1327 	struct inet6_dev *idev;
1328 	struct inet6_ifaddr *ifa;
1329 	int	onlink;
1330 
1331 	onlink = 0;
1332 	rcu_read_lock();
1333 	idev = __in6_dev_get(dev);
1334 	if (idev) {
1335 		read_lock_bh(&idev->lock);
1336 		for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
1337 			onlink = ipv6_prefix_equal(addr, &ifa->addr,
1338 						   ifa->prefix_len);
1339 			if (onlink)
1340 				break;
1341 		}
1342 		read_unlock_bh(&idev->lock);
1343 	}
1344 	rcu_read_unlock();
1345 	return onlink;
1346 }
1347 
1348 EXPORT_SYMBOL(ipv6_chk_prefix);
1349 
1350 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1351 				     struct net_device *dev, int strict)
1352 {
1353 	struct inet6_ifaddr * ifp;
1354 	u8 hash = ipv6_addr_hash(addr);
1355 
1356 	read_lock_bh(&addrconf_hash_lock);
1357 	for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1358 		if (!net_eq(dev_net(ifp->idev->dev), net))
1359 			continue;
1360 		if (ipv6_addr_equal(&ifp->addr, addr)) {
1361 			if (dev == NULL || ifp->idev->dev == dev ||
1362 			    !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1363 				in6_ifa_hold(ifp);
1364 				break;
1365 			}
1366 		}
1367 	}
1368 	read_unlock_bh(&addrconf_hash_lock);
1369 
1370 	return ifp;
1371 }
1372 
1373 /* Gets referenced address, destroys ifaddr */
1374 
1375 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1376 {
1377 	if (ifp->flags&IFA_F_PERMANENT) {
1378 		spin_lock_bh(&ifp->lock);
1379 		addrconf_del_timer(ifp);
1380 		ifp->flags |= IFA_F_TENTATIVE;
1381 		if (dad_failed)
1382 			ifp->flags |= IFA_F_DADFAILED;
1383 		spin_unlock_bh(&ifp->lock);
1384 		in6_ifa_put(ifp);
1385 #ifdef CONFIG_IPV6_PRIVACY
1386 	} else if (ifp->flags&IFA_F_TEMPORARY) {
1387 		struct inet6_ifaddr *ifpub;
1388 		spin_lock_bh(&ifp->lock);
1389 		ifpub = ifp->ifpub;
1390 		if (ifpub) {
1391 			in6_ifa_hold(ifpub);
1392 			spin_unlock_bh(&ifp->lock);
1393 			ipv6_create_tempaddr(ifpub, ifp);
1394 			in6_ifa_put(ifpub);
1395 		} else {
1396 			spin_unlock_bh(&ifp->lock);
1397 		}
1398 		ipv6_del_addr(ifp);
1399 #endif
1400 	} else
1401 		ipv6_del_addr(ifp);
1402 }
1403 
1404 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1405 {
1406 	struct inet6_dev *idev = ifp->idev;
1407 
1408 	if (net_ratelimit())
1409 		printk(KERN_INFO "%s: IPv6 duplicate address %pI6c detected!\n",
1410 			ifp->idev->dev->name, &ifp->addr);
1411 
1412 	if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1413 		struct in6_addr addr;
1414 
1415 		addr.s6_addr32[0] = htonl(0xfe800000);
1416 		addr.s6_addr32[1] = 0;
1417 
1418 		if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1419 		    ipv6_addr_equal(&ifp->addr, &addr)) {
1420 			/* DAD failed for link-local based on MAC address */
1421 			idev->cnf.disable_ipv6 = 1;
1422 
1423 			printk(KERN_INFO "%s: IPv6 being disabled!\n",
1424 				ifp->idev->dev->name);
1425 		}
1426 	}
1427 
1428 	addrconf_dad_stop(ifp, 1);
1429 }
1430 
1431 /* Join to solicited addr multicast group. */
1432 
1433 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1434 {
1435 	struct in6_addr maddr;
1436 
1437 	if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1438 		return;
1439 
1440 	addrconf_addr_solict_mult(addr, &maddr);
1441 	ipv6_dev_mc_inc(dev, &maddr);
1442 }
1443 
1444 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1445 {
1446 	struct in6_addr maddr;
1447 
1448 	if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1449 		return;
1450 
1451 	addrconf_addr_solict_mult(addr, &maddr);
1452 	__ipv6_dev_mc_dec(idev, &maddr);
1453 }
1454 
1455 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1456 {
1457 	struct in6_addr addr;
1458 	ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1459 	if (ipv6_addr_any(&addr))
1460 		return;
1461 	ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1462 }
1463 
1464 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1465 {
1466 	struct in6_addr addr;
1467 	ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1468 	if (ipv6_addr_any(&addr))
1469 		return;
1470 	__ipv6_dev_ac_dec(ifp->idev, &addr);
1471 }
1472 
1473 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1474 {
1475 	if (dev->addr_len != ETH_ALEN)
1476 		return -1;
1477 	memcpy(eui, dev->dev_addr, 3);
1478 	memcpy(eui + 5, dev->dev_addr + 3, 3);
1479 
1480 	/*
1481 	 * The zSeries OSA network cards can be shared among various
1482 	 * OS instances, but the OSA cards have only one MAC address.
1483 	 * This leads to duplicate address conflicts in conjunction
1484 	 * with IPv6 if more than one instance uses the same card.
1485 	 *
1486 	 * The driver for these cards can deliver a unique 16-bit
1487 	 * identifier for each instance sharing the same card.  It is
1488 	 * placed instead of 0xFFFE in the interface identifier.  The
1489 	 * "u" bit of the interface identifier is not inverted in this
1490 	 * case.  Hence the resulting interface identifier has local
1491 	 * scope according to RFC2373.
1492 	 */
1493 	if (dev->dev_id) {
1494 		eui[3] = (dev->dev_id >> 8) & 0xFF;
1495 		eui[4] = dev->dev_id & 0xFF;
1496 	} else {
1497 		eui[3] = 0xFF;
1498 		eui[4] = 0xFE;
1499 		eui[0] ^= 2;
1500 	}
1501 	return 0;
1502 }
1503 
1504 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1505 {
1506 	/* XXX: inherit EUI-64 from other interface -- yoshfuji */
1507 	if (dev->addr_len != ARCNET_ALEN)
1508 		return -1;
1509 	memset(eui, 0, 7);
1510 	eui[7] = *(u8*)dev->dev_addr;
1511 	return 0;
1512 }
1513 
1514 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1515 {
1516 	if (dev->addr_len != INFINIBAND_ALEN)
1517 		return -1;
1518 	memcpy(eui, dev->dev_addr + 12, 8);
1519 	eui[0] |= 2;
1520 	return 0;
1521 }
1522 
1523 int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1524 {
1525 	if (addr == 0)
1526 		return -1;
1527 	eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1528 		  ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1529 		  ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1530 		  ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1531 		  ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1532 		  ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1533 	eui[1] = 0;
1534 	eui[2] = 0x5E;
1535 	eui[3] = 0xFE;
1536 	memcpy(eui + 4, &addr, 4);
1537 	return 0;
1538 }
1539 EXPORT_SYMBOL(__ipv6_isatap_ifid);
1540 
1541 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1542 {
1543 	if (dev->priv_flags & IFF_ISATAP)
1544 		return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1545 	return -1;
1546 }
1547 
1548 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1549 {
1550 	switch (dev->type) {
1551 	case ARPHRD_ETHER:
1552 	case ARPHRD_FDDI:
1553 	case ARPHRD_IEEE802_TR:
1554 		return addrconf_ifid_eui48(eui, dev);
1555 	case ARPHRD_ARCNET:
1556 		return addrconf_ifid_arcnet(eui, dev);
1557 	case ARPHRD_INFINIBAND:
1558 		return addrconf_ifid_infiniband(eui, dev);
1559 	case ARPHRD_SIT:
1560 		return addrconf_ifid_sit(eui, dev);
1561 	}
1562 	return -1;
1563 }
1564 
1565 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1566 {
1567 	int err = -1;
1568 	struct inet6_ifaddr *ifp;
1569 
1570 	read_lock_bh(&idev->lock);
1571 	for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1572 		if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1573 			memcpy(eui, ifp->addr.s6_addr+8, 8);
1574 			err = 0;
1575 			break;
1576 		}
1577 	}
1578 	read_unlock_bh(&idev->lock);
1579 	return err;
1580 }
1581 
1582 #ifdef CONFIG_IPV6_PRIVACY
1583 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1584 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1585 {
1586 regen:
1587 	get_random_bytes(idev->rndid, sizeof(idev->rndid));
1588 	idev->rndid[0] &= ~0x02;
1589 
1590 	/*
1591 	 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1592 	 * check if generated address is not inappropriate
1593 	 *
1594 	 *  - Reserved subnet anycast (RFC 2526)
1595 	 *	11111101 11....11 1xxxxxxx
1596 	 *  - ISATAP (RFC4214) 6.1
1597 	 *	00-00-5E-FE-xx-xx-xx-xx
1598 	 *  - value 0
1599 	 *  - XXX: already assigned to an address on the device
1600 	 */
1601 	if (idev->rndid[0] == 0xfd &&
1602 	    (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1603 	    (idev->rndid[7]&0x80))
1604 		goto regen;
1605 	if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1606 		if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1607 			goto regen;
1608 		if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1609 			goto regen;
1610 	}
1611 
1612 	return 0;
1613 }
1614 
1615 static void ipv6_regen_rndid(unsigned long data)
1616 {
1617 	struct inet6_dev *idev = (struct inet6_dev *) data;
1618 	unsigned long expires;
1619 
1620 	rcu_read_lock_bh();
1621 	write_lock_bh(&idev->lock);
1622 
1623 	if (idev->dead)
1624 		goto out;
1625 
1626 	if (__ipv6_regen_rndid(idev) < 0)
1627 		goto out;
1628 
1629 	expires = jiffies +
1630 		idev->cnf.temp_prefered_lft * HZ -
1631 		idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1632 	if (time_before(expires, jiffies)) {
1633 		printk(KERN_WARNING
1634 			"ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1635 			idev->dev->name);
1636 		goto out;
1637 	}
1638 
1639 	if (!mod_timer(&idev->regen_timer, expires))
1640 		in6_dev_hold(idev);
1641 
1642 out:
1643 	write_unlock_bh(&idev->lock);
1644 	rcu_read_unlock_bh();
1645 	in6_dev_put(idev);
1646 }
1647 
1648 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1649 	int ret = 0;
1650 
1651 	if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1652 		ret = __ipv6_regen_rndid(idev);
1653 	return ret;
1654 }
1655 #endif
1656 
1657 /*
1658  *	Add prefix route.
1659  */
1660 
1661 static void
1662 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1663 		      unsigned long expires, u32 flags)
1664 {
1665 	struct fib6_config cfg = {
1666 		.fc_table = RT6_TABLE_PREFIX,
1667 		.fc_metric = IP6_RT_PRIO_ADDRCONF,
1668 		.fc_ifindex = dev->ifindex,
1669 		.fc_expires = expires,
1670 		.fc_dst_len = plen,
1671 		.fc_flags = RTF_UP | flags,
1672 		.fc_nlinfo.nl_net = dev_net(dev),
1673 		.fc_protocol = RTPROT_KERNEL,
1674 	};
1675 
1676 	ipv6_addr_copy(&cfg.fc_dst, pfx);
1677 
1678 	/* Prevent useless cloning on PtP SIT.
1679 	   This thing is done here expecting that the whole
1680 	   class of non-broadcast devices need not cloning.
1681 	 */
1682 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1683 	if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1684 		cfg.fc_flags |= RTF_NONEXTHOP;
1685 #endif
1686 
1687 	ip6_route_add(&cfg);
1688 }
1689 
1690 /* Create "default" multicast route to the interface */
1691 
1692 static void addrconf_add_mroute(struct net_device *dev)
1693 {
1694 	struct fib6_config cfg = {
1695 		.fc_table = RT6_TABLE_LOCAL,
1696 		.fc_metric = IP6_RT_PRIO_ADDRCONF,
1697 		.fc_ifindex = dev->ifindex,
1698 		.fc_dst_len = 8,
1699 		.fc_flags = RTF_UP,
1700 		.fc_nlinfo.nl_net = dev_net(dev),
1701 	};
1702 
1703 	ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1704 
1705 	ip6_route_add(&cfg);
1706 }
1707 
1708 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1709 static void sit_route_add(struct net_device *dev)
1710 {
1711 	struct fib6_config cfg = {
1712 		.fc_table = RT6_TABLE_MAIN,
1713 		.fc_metric = IP6_RT_PRIO_ADDRCONF,
1714 		.fc_ifindex = dev->ifindex,
1715 		.fc_dst_len = 96,
1716 		.fc_flags = RTF_UP | RTF_NONEXTHOP,
1717 		.fc_nlinfo.nl_net = dev_net(dev),
1718 	};
1719 
1720 	/* prefix length - 96 bits "::d.d.d.d" */
1721 	ip6_route_add(&cfg);
1722 }
1723 #endif
1724 
1725 static void addrconf_add_lroute(struct net_device *dev)
1726 {
1727 	struct in6_addr addr;
1728 
1729 	ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
1730 	addrconf_prefix_route(&addr, 64, dev, 0, 0);
1731 }
1732 
1733 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1734 {
1735 	struct inet6_dev *idev;
1736 
1737 	ASSERT_RTNL();
1738 
1739 	if ((idev = ipv6_find_idev(dev)) == NULL)
1740 		return NULL;
1741 
1742 	/* Add default multicast route */
1743 	addrconf_add_mroute(dev);
1744 
1745 	/* Add link local route */
1746 	addrconf_add_lroute(dev);
1747 	return idev;
1748 }
1749 
1750 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1751 {
1752 	struct prefix_info *pinfo;
1753 	__u32 valid_lft;
1754 	__u32 prefered_lft;
1755 	int addr_type;
1756 	struct inet6_dev *in6_dev;
1757 	struct net *net = dev_net(dev);
1758 
1759 	pinfo = (struct prefix_info *) opt;
1760 
1761 	if (len < sizeof(struct prefix_info)) {
1762 		ADBG(("addrconf: prefix option too short\n"));
1763 		return;
1764 	}
1765 
1766 	/*
1767 	 *	Validation checks ([ADDRCONF], page 19)
1768 	 */
1769 
1770 	addr_type = ipv6_addr_type(&pinfo->prefix);
1771 
1772 	if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1773 		return;
1774 
1775 	valid_lft = ntohl(pinfo->valid);
1776 	prefered_lft = ntohl(pinfo->prefered);
1777 
1778 	if (prefered_lft > valid_lft) {
1779 		if (net_ratelimit())
1780 			printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1781 		return;
1782 	}
1783 
1784 	in6_dev = in6_dev_get(dev);
1785 
1786 	if (in6_dev == NULL) {
1787 		if (net_ratelimit())
1788 			printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1789 		return;
1790 	}
1791 
1792 	/*
1793 	 *	Two things going on here:
1794 	 *	1) Add routes for on-link prefixes
1795 	 *	2) Configure prefixes with the auto flag set
1796 	 */
1797 
1798 	if (pinfo->onlink) {
1799 		struct rt6_info *rt;
1800 		unsigned long rt_expires;
1801 
1802 		/* Avoid arithmetic overflow. Really, we could
1803 		 * save rt_expires in seconds, likely valid_lft,
1804 		 * but it would require division in fib gc, that it
1805 		 * not good.
1806 		 */
1807 		if (HZ > USER_HZ)
1808 			rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
1809 		else
1810 			rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
1811 
1812 		if (addrconf_finite_timeout(rt_expires))
1813 			rt_expires *= HZ;
1814 
1815 		rt = rt6_lookup(net, &pinfo->prefix, NULL,
1816 				dev->ifindex, 1);
1817 
1818 		if (rt && addrconf_is_prefix_route(rt)) {
1819 			/* Autoconf prefix route */
1820 			if (valid_lft == 0) {
1821 				ip6_del_rt(rt);
1822 				rt = NULL;
1823 			} else if (addrconf_finite_timeout(rt_expires)) {
1824 				/* not infinity */
1825 				rt->rt6i_expires = jiffies + rt_expires;
1826 				rt->rt6i_flags |= RTF_EXPIRES;
1827 			} else {
1828 				rt->rt6i_flags &= ~RTF_EXPIRES;
1829 				rt->rt6i_expires = 0;
1830 			}
1831 		} else if (valid_lft) {
1832 			clock_t expires = 0;
1833 			int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
1834 			if (addrconf_finite_timeout(rt_expires)) {
1835 				/* not infinity */
1836 				flags |= RTF_EXPIRES;
1837 				expires = jiffies_to_clock_t(rt_expires);
1838 			}
1839 			addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1840 					      dev, expires, flags);
1841 		}
1842 		if (rt)
1843 			dst_release(&rt->u.dst);
1844 	}
1845 
1846 	/* Try to figure out our local address for this prefix */
1847 
1848 	if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1849 		struct inet6_ifaddr * ifp;
1850 		struct in6_addr addr;
1851 		int create = 0, update_lft = 0;
1852 
1853 		if (pinfo->prefix_len == 64) {
1854 			memcpy(&addr, &pinfo->prefix, 8);
1855 			if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1856 			    ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1857 				in6_dev_put(in6_dev);
1858 				return;
1859 			}
1860 			goto ok;
1861 		}
1862 		if (net_ratelimit())
1863 			printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1864 			       pinfo->prefix_len);
1865 		in6_dev_put(in6_dev);
1866 		return;
1867 
1868 ok:
1869 
1870 		ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1871 
1872 		if (ifp == NULL && valid_lft) {
1873 			int max_addresses = in6_dev->cnf.max_addresses;
1874 			u32 addr_flags = 0;
1875 
1876 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1877 			if (in6_dev->cnf.optimistic_dad &&
1878 			    !net->ipv6.devconf_all->forwarding)
1879 				addr_flags = IFA_F_OPTIMISTIC;
1880 #endif
1881 
1882 			/* Do not allow to create too much of autoconfigured
1883 			 * addresses; this would be too easy way to crash kernel.
1884 			 */
1885 			if (!max_addresses ||
1886 			    ipv6_count_addresses(in6_dev) < max_addresses)
1887 				ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1888 						    addr_type&IPV6_ADDR_SCOPE_MASK,
1889 						    addr_flags);
1890 
1891 			if (!ifp || IS_ERR(ifp)) {
1892 				in6_dev_put(in6_dev);
1893 				return;
1894 			}
1895 
1896 			update_lft = create = 1;
1897 			ifp->cstamp = jiffies;
1898 			addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1899 		}
1900 
1901 		if (ifp) {
1902 			int flags;
1903 			unsigned long now;
1904 #ifdef CONFIG_IPV6_PRIVACY
1905 			struct inet6_ifaddr *ift;
1906 #endif
1907 			u32 stored_lft;
1908 
1909 			/* update lifetime (RFC2462 5.5.3 e) */
1910 			spin_lock(&ifp->lock);
1911 			now = jiffies;
1912 			if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1913 				stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1914 			else
1915 				stored_lft = 0;
1916 			if (!update_lft && stored_lft) {
1917 				if (valid_lft > MIN_VALID_LIFETIME ||
1918 				    valid_lft > stored_lft)
1919 					update_lft = 1;
1920 				else if (stored_lft <= MIN_VALID_LIFETIME) {
1921 					/* valid_lft <= stored_lft is always true */
1922 					/*
1923 					 * RFC 4862 Section 5.5.3e:
1924 					 * "Note that the preferred lifetime of
1925 					 *  the corresponding address is always
1926 					 *  reset to the Preferred Lifetime in
1927 					 *  the received Prefix Information
1928 					 *  option, regardless of whether the
1929 					 *  valid lifetime is also reset or
1930 					 *  ignored."
1931 					 *
1932 					 *  So if the preferred lifetime in
1933 					 *  this advertisement is different
1934 					 *  than what we have stored, but the
1935 					 *  valid lifetime is invalid, just
1936 					 *  reset prefered_lft.
1937 					 *
1938 					 *  We must set the valid lifetime
1939 					 *  to the stored lifetime since we'll
1940 					 *  be updating the timestamp below,
1941 					 *  else we'll set it back to the
1942 					 *  minumum.
1943 					 */
1944 					if (prefered_lft != ifp->prefered_lft) {
1945 						valid_lft = stored_lft;
1946 						update_lft = 1;
1947 					}
1948 				} else {
1949 					valid_lft = MIN_VALID_LIFETIME;
1950 					if (valid_lft < prefered_lft)
1951 						prefered_lft = valid_lft;
1952 					update_lft = 1;
1953 				}
1954 			}
1955 
1956 			if (update_lft) {
1957 				ifp->valid_lft = valid_lft;
1958 				ifp->prefered_lft = prefered_lft;
1959 				ifp->tstamp = now;
1960 				flags = ifp->flags;
1961 				ifp->flags &= ~IFA_F_DEPRECATED;
1962 				spin_unlock(&ifp->lock);
1963 
1964 				if (!(flags&IFA_F_TENTATIVE))
1965 					ipv6_ifa_notify(0, ifp);
1966 			} else
1967 				spin_unlock(&ifp->lock);
1968 
1969 #ifdef CONFIG_IPV6_PRIVACY
1970 			read_lock_bh(&in6_dev->lock);
1971 			/* update all temporary addresses in the list */
1972 			for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1973 				/*
1974 				 * When adjusting the lifetimes of an existing
1975 				 * temporary address, only lower the lifetimes.
1976 				 * Implementations must not increase the
1977 				 * lifetimes of an existing temporary address
1978 				 * when processing a Prefix Information Option.
1979 				 */
1980 				if (ifp != ift->ifpub)
1981 					continue;
1982 
1983 				spin_lock(&ift->lock);
1984 				flags = ift->flags;
1985 				if (ift->valid_lft > valid_lft &&
1986 				    ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1987 					ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1988 				if (ift->prefered_lft > prefered_lft &&
1989 				    ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1990 					ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1991 				spin_unlock(&ift->lock);
1992 				if (!(flags&IFA_F_TENTATIVE))
1993 					ipv6_ifa_notify(0, ift);
1994 			}
1995 
1996 			if (create && in6_dev->cnf.use_tempaddr > 0) {
1997 				/*
1998 				 * When a new public address is created as described in [ADDRCONF],
1999 				 * also create a new temporary address.
2000 				 */
2001 				read_unlock_bh(&in6_dev->lock);
2002 				ipv6_create_tempaddr(ifp, NULL);
2003 			} else {
2004 				read_unlock_bh(&in6_dev->lock);
2005 			}
2006 #endif
2007 			in6_ifa_put(ifp);
2008 			addrconf_verify(0);
2009 		}
2010 	}
2011 	inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2012 	in6_dev_put(in6_dev);
2013 }
2014 
2015 /*
2016  *	Set destination address.
2017  *	Special case for SIT interfaces where we create a new "virtual"
2018  *	device.
2019  */
2020 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2021 {
2022 	struct in6_ifreq ireq;
2023 	struct net_device *dev;
2024 	int err = -EINVAL;
2025 
2026 	rtnl_lock();
2027 
2028 	err = -EFAULT;
2029 	if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2030 		goto err_exit;
2031 
2032 	dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2033 
2034 	err = -ENODEV;
2035 	if (dev == NULL)
2036 		goto err_exit;
2037 
2038 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2039 	if (dev->type == ARPHRD_SIT) {
2040 		const struct net_device_ops *ops = dev->netdev_ops;
2041 		struct ifreq ifr;
2042 		struct ip_tunnel_parm p;
2043 
2044 		err = -EADDRNOTAVAIL;
2045 		if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2046 			goto err_exit;
2047 
2048 		memset(&p, 0, sizeof(p));
2049 		p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2050 		p.iph.saddr = 0;
2051 		p.iph.version = 4;
2052 		p.iph.ihl = 5;
2053 		p.iph.protocol = IPPROTO_IPV6;
2054 		p.iph.ttl = 64;
2055 		ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2056 
2057 		if (ops->ndo_do_ioctl) {
2058 			mm_segment_t oldfs = get_fs();
2059 
2060 			set_fs(KERNEL_DS);
2061 			err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2062 			set_fs(oldfs);
2063 		} else
2064 			err = -EOPNOTSUPP;
2065 
2066 		if (err == 0) {
2067 			err = -ENOBUFS;
2068 			dev = __dev_get_by_name(net, p.name);
2069 			if (!dev)
2070 				goto err_exit;
2071 			err = dev_open(dev);
2072 		}
2073 	}
2074 #endif
2075 
2076 err_exit:
2077 	rtnl_unlock();
2078 	return err;
2079 }
2080 
2081 /*
2082  *	Manual configuration of address on an interface
2083  */
2084 static int inet6_addr_add(struct net *net, int ifindex, struct in6_addr *pfx,
2085 			  unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
2086 			  __u32 valid_lft)
2087 {
2088 	struct inet6_ifaddr *ifp;
2089 	struct inet6_dev *idev;
2090 	struct net_device *dev;
2091 	int scope;
2092 	u32 flags;
2093 	clock_t expires;
2094 	unsigned long timeout;
2095 
2096 	ASSERT_RTNL();
2097 
2098 	if (plen > 128)
2099 		return -EINVAL;
2100 
2101 	/* check the lifetime */
2102 	if (!valid_lft || prefered_lft > valid_lft)
2103 		return -EINVAL;
2104 
2105 	dev = __dev_get_by_index(net, ifindex);
2106 	if (!dev)
2107 		return -ENODEV;
2108 
2109 	if ((idev = addrconf_add_dev(dev)) == NULL)
2110 		return -ENOBUFS;
2111 
2112 	scope = ipv6_addr_scope(pfx);
2113 
2114 	timeout = addrconf_timeout_fixup(valid_lft, HZ);
2115 	if (addrconf_finite_timeout(timeout)) {
2116 		expires = jiffies_to_clock_t(timeout * HZ);
2117 		valid_lft = timeout;
2118 		flags = RTF_EXPIRES;
2119 	} else {
2120 		expires = 0;
2121 		flags = 0;
2122 		ifa_flags |= IFA_F_PERMANENT;
2123 	}
2124 
2125 	timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2126 	if (addrconf_finite_timeout(timeout)) {
2127 		if (timeout == 0)
2128 			ifa_flags |= IFA_F_DEPRECATED;
2129 		prefered_lft = timeout;
2130 	}
2131 
2132 	ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2133 
2134 	if (!IS_ERR(ifp)) {
2135 		spin_lock_bh(&ifp->lock);
2136 		ifp->valid_lft = valid_lft;
2137 		ifp->prefered_lft = prefered_lft;
2138 		ifp->tstamp = jiffies;
2139 		spin_unlock_bh(&ifp->lock);
2140 
2141 		addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2142 				      expires, flags);
2143 		/*
2144 		 * Note that section 3.1 of RFC 4429 indicates
2145 		 * that the Optimistic flag should not be set for
2146 		 * manually configured addresses
2147 		 */
2148 		addrconf_dad_start(ifp, 0);
2149 		in6_ifa_put(ifp);
2150 		addrconf_verify(0);
2151 		return 0;
2152 	}
2153 
2154 	return PTR_ERR(ifp);
2155 }
2156 
2157 static int inet6_addr_del(struct net *net, int ifindex, struct in6_addr *pfx,
2158 			  unsigned int plen)
2159 {
2160 	struct inet6_ifaddr *ifp;
2161 	struct inet6_dev *idev;
2162 	struct net_device *dev;
2163 
2164 	if (plen > 128)
2165 		return -EINVAL;
2166 
2167 	dev = __dev_get_by_index(net, ifindex);
2168 	if (!dev)
2169 		return -ENODEV;
2170 
2171 	if ((idev = __in6_dev_get(dev)) == NULL)
2172 		return -ENXIO;
2173 
2174 	read_lock_bh(&idev->lock);
2175 	for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
2176 		if (ifp->prefix_len == plen &&
2177 		    ipv6_addr_equal(pfx, &ifp->addr)) {
2178 			in6_ifa_hold(ifp);
2179 			read_unlock_bh(&idev->lock);
2180 
2181 			ipv6_del_addr(ifp);
2182 
2183 			/* If the last address is deleted administratively,
2184 			   disable IPv6 on this interface.
2185 			 */
2186 			if (idev->addr_list == NULL)
2187 				addrconf_ifdown(idev->dev, 1);
2188 			return 0;
2189 		}
2190 	}
2191 	read_unlock_bh(&idev->lock);
2192 	return -EADDRNOTAVAIL;
2193 }
2194 
2195 
2196 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2197 {
2198 	struct in6_ifreq ireq;
2199 	int err;
2200 
2201 	if (!capable(CAP_NET_ADMIN))
2202 		return -EPERM;
2203 
2204 	if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2205 		return -EFAULT;
2206 
2207 	rtnl_lock();
2208 	err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2209 			     ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2210 			     INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2211 	rtnl_unlock();
2212 	return err;
2213 }
2214 
2215 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2216 {
2217 	struct in6_ifreq ireq;
2218 	int err;
2219 
2220 	if (!capable(CAP_NET_ADMIN))
2221 		return -EPERM;
2222 
2223 	if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2224 		return -EFAULT;
2225 
2226 	rtnl_lock();
2227 	err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2228 			     ireq.ifr6_prefixlen);
2229 	rtnl_unlock();
2230 	return err;
2231 }
2232 
2233 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2234 		     int plen, int scope)
2235 {
2236 	struct inet6_ifaddr *ifp;
2237 
2238 	ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT);
2239 	if (!IS_ERR(ifp)) {
2240 		spin_lock_bh(&ifp->lock);
2241 		ifp->flags &= ~IFA_F_TENTATIVE;
2242 		spin_unlock_bh(&ifp->lock);
2243 		ipv6_ifa_notify(RTM_NEWADDR, ifp);
2244 		in6_ifa_put(ifp);
2245 	}
2246 }
2247 
2248 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2249 static void sit_add_v4_addrs(struct inet6_dev *idev)
2250 {
2251 	struct in6_addr addr;
2252 	struct net_device *dev;
2253 	struct net *net = dev_net(idev->dev);
2254 	int scope;
2255 
2256 	ASSERT_RTNL();
2257 
2258 	memset(&addr, 0, sizeof(struct in6_addr));
2259 	memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2260 
2261 	if (idev->dev->flags&IFF_POINTOPOINT) {
2262 		addr.s6_addr32[0] = htonl(0xfe800000);
2263 		scope = IFA_LINK;
2264 	} else {
2265 		scope = IPV6_ADDR_COMPATv4;
2266 	}
2267 
2268 	if (addr.s6_addr32[3]) {
2269 		add_addr(idev, &addr, 128, scope);
2270 		return;
2271 	}
2272 
2273 	for_each_netdev(net, dev) {
2274 		struct in_device * in_dev = __in_dev_get_rtnl(dev);
2275 		if (in_dev && (dev->flags & IFF_UP)) {
2276 			struct in_ifaddr * ifa;
2277 
2278 			int flag = scope;
2279 
2280 			for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2281 				int plen;
2282 
2283 				addr.s6_addr32[3] = ifa->ifa_local;
2284 
2285 				if (ifa->ifa_scope == RT_SCOPE_LINK)
2286 					continue;
2287 				if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2288 					if (idev->dev->flags&IFF_POINTOPOINT)
2289 						continue;
2290 					flag |= IFA_HOST;
2291 				}
2292 				if (idev->dev->flags&IFF_POINTOPOINT)
2293 					plen = 64;
2294 				else
2295 					plen = 96;
2296 
2297 				add_addr(idev, &addr, plen, flag);
2298 			}
2299 		}
2300 	}
2301 }
2302 #endif
2303 
2304 static void init_loopback(struct net_device *dev)
2305 {
2306 	struct inet6_dev  *idev;
2307 
2308 	/* ::1 */
2309 
2310 	ASSERT_RTNL();
2311 
2312 	if ((idev = ipv6_find_idev(dev)) == NULL) {
2313 		printk(KERN_DEBUG "init loopback: add_dev failed\n");
2314 		return;
2315 	}
2316 
2317 	add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2318 }
2319 
2320 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2321 {
2322 	struct inet6_ifaddr * ifp;
2323 	u32 addr_flags = IFA_F_PERMANENT;
2324 
2325 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2326 	if (idev->cnf.optimistic_dad &&
2327 	    !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2328 		addr_flags |= IFA_F_OPTIMISTIC;
2329 #endif
2330 
2331 
2332 	ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2333 	if (!IS_ERR(ifp)) {
2334 		addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2335 		addrconf_dad_start(ifp, 0);
2336 		in6_ifa_put(ifp);
2337 	}
2338 }
2339 
2340 static void addrconf_dev_config(struct net_device *dev)
2341 {
2342 	struct in6_addr addr;
2343 	struct inet6_dev    * idev;
2344 
2345 	ASSERT_RTNL();
2346 
2347 	if ((dev->type != ARPHRD_ETHER) &&
2348 	    (dev->type != ARPHRD_FDDI) &&
2349 	    (dev->type != ARPHRD_IEEE802_TR) &&
2350 	    (dev->type != ARPHRD_ARCNET) &&
2351 	    (dev->type != ARPHRD_INFINIBAND)) {
2352 		/* Alas, we support only Ethernet autoconfiguration. */
2353 		return;
2354 	}
2355 
2356 	idev = addrconf_add_dev(dev);
2357 	if (idev == NULL)
2358 		return;
2359 
2360 	memset(&addr, 0, sizeof(struct in6_addr));
2361 	addr.s6_addr32[0] = htonl(0xFE800000);
2362 
2363 	if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2364 		addrconf_add_linklocal(idev, &addr);
2365 }
2366 
2367 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2368 static void addrconf_sit_config(struct net_device *dev)
2369 {
2370 	struct inet6_dev *idev;
2371 
2372 	ASSERT_RTNL();
2373 
2374 	/*
2375 	 * Configure the tunnel with one of our IPv4
2376 	 * addresses... we should configure all of
2377 	 * our v4 addrs in the tunnel
2378 	 */
2379 
2380 	if ((idev = ipv6_find_idev(dev)) == NULL) {
2381 		printk(KERN_DEBUG "init sit: add_dev failed\n");
2382 		return;
2383 	}
2384 
2385 	if (dev->priv_flags & IFF_ISATAP) {
2386 		struct in6_addr addr;
2387 
2388 		ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
2389 		addrconf_prefix_route(&addr, 64, dev, 0, 0);
2390 		if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2391 			addrconf_add_linklocal(idev, &addr);
2392 		return;
2393 	}
2394 
2395 	sit_add_v4_addrs(idev);
2396 
2397 	if (dev->flags&IFF_POINTOPOINT) {
2398 		addrconf_add_mroute(dev);
2399 		addrconf_add_lroute(dev);
2400 	} else
2401 		sit_route_add(dev);
2402 }
2403 #endif
2404 
2405 static inline int
2406 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2407 {
2408 	struct in6_addr lladdr;
2409 
2410 	if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2411 		addrconf_add_linklocal(idev, &lladdr);
2412 		return 0;
2413 	}
2414 	return -1;
2415 }
2416 
2417 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2418 {
2419 	struct net_device *link_dev;
2420 	struct net *net = dev_net(idev->dev);
2421 
2422 	/* first try to inherit the link-local address from the link device */
2423 	if (idev->dev->iflink &&
2424 	    (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
2425 		if (!ipv6_inherit_linklocal(idev, link_dev))
2426 			return;
2427 	}
2428 	/* then try to inherit it from any device */
2429 	for_each_netdev(net, link_dev) {
2430 		if (!ipv6_inherit_linklocal(idev, link_dev))
2431 			return;
2432 	}
2433 	printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2434 }
2435 
2436 /*
2437  * Autoconfigure tunnel with a link-local address so routing protocols,
2438  * DHCPv6, MLD etc. can be run over the virtual link
2439  */
2440 
2441 static void addrconf_ip6_tnl_config(struct net_device *dev)
2442 {
2443 	struct inet6_dev *idev;
2444 
2445 	ASSERT_RTNL();
2446 
2447 	if ((idev = addrconf_add_dev(dev)) == NULL) {
2448 		printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2449 		return;
2450 	}
2451 	ip6_tnl_add_linklocal(idev);
2452 }
2453 
2454 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2455 			   void * data)
2456 {
2457 	struct net_device *dev = (struct net_device *) data;
2458 	struct inet6_dev *idev = __in6_dev_get(dev);
2459 	int run_pending = 0;
2460 	int err;
2461 
2462 	switch(event) {
2463 	case NETDEV_REGISTER:
2464 		if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2465 			idev = ipv6_add_dev(dev);
2466 			if (!idev)
2467 				return notifier_from_errno(-ENOMEM);
2468 		}
2469 		break;
2470 	case NETDEV_UP:
2471 	case NETDEV_CHANGE:
2472 		if (dev->flags & IFF_SLAVE)
2473 			break;
2474 
2475 		if (event == NETDEV_UP) {
2476 			if (!addrconf_qdisc_ok(dev)) {
2477 				/* device is not ready yet. */
2478 				printk(KERN_INFO
2479 					"ADDRCONF(NETDEV_UP): %s: "
2480 					"link is not ready\n",
2481 					dev->name);
2482 				break;
2483 			}
2484 
2485 			if (!idev && dev->mtu >= IPV6_MIN_MTU)
2486 				idev = ipv6_add_dev(dev);
2487 
2488 			if (idev) {
2489 				idev->if_flags |= IF_READY;
2490 				run_pending = 1;
2491 			}
2492 		} else {
2493 			if (!addrconf_qdisc_ok(dev)) {
2494 				/* device is still not ready. */
2495 				break;
2496 			}
2497 
2498 			if (idev) {
2499 				if (idev->if_flags & IF_READY) {
2500 					/* device is already configured. */
2501 					break;
2502 				}
2503 				idev->if_flags |= IF_READY;
2504 			}
2505 
2506 			printk(KERN_INFO
2507 					"ADDRCONF(NETDEV_CHANGE): %s: "
2508 					"link becomes ready\n",
2509 					dev->name);
2510 
2511 			run_pending = 1;
2512 		}
2513 
2514 		switch(dev->type) {
2515 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2516 		case ARPHRD_SIT:
2517 			addrconf_sit_config(dev);
2518 			break;
2519 #endif
2520 		case ARPHRD_TUNNEL6:
2521 			addrconf_ip6_tnl_config(dev);
2522 			break;
2523 		case ARPHRD_LOOPBACK:
2524 			init_loopback(dev);
2525 			break;
2526 
2527 		default:
2528 			addrconf_dev_config(dev);
2529 			break;
2530 		}
2531 		if (idev) {
2532 			if (run_pending)
2533 				addrconf_dad_run(idev);
2534 
2535 			/* If the MTU changed during the interface down, when the
2536 			   interface up, the changed MTU must be reflected in the
2537 			   idev as well as routers.
2538 			 */
2539 			if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2540 				rt6_mtu_change(dev, dev->mtu);
2541 				idev->cnf.mtu6 = dev->mtu;
2542 			}
2543 			idev->tstamp = jiffies;
2544 			inet6_ifinfo_notify(RTM_NEWLINK, idev);
2545 			/* If the changed mtu during down is lower than IPV6_MIN_MTU
2546 			   stop IPv6 on this interface.
2547 			 */
2548 			if (dev->mtu < IPV6_MIN_MTU)
2549 				addrconf_ifdown(dev, event != NETDEV_DOWN);
2550 		}
2551 		break;
2552 
2553 	case NETDEV_CHANGEMTU:
2554 		if (idev && dev->mtu >= IPV6_MIN_MTU) {
2555 			rt6_mtu_change(dev, dev->mtu);
2556 			idev->cnf.mtu6 = dev->mtu;
2557 			break;
2558 		}
2559 
2560 		if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2561 			idev = ipv6_add_dev(dev);
2562 			if (idev)
2563 				break;
2564 		}
2565 
2566 		/* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2567 
2568 	case NETDEV_DOWN:
2569 	case NETDEV_UNREGISTER:
2570 		/*
2571 		 *	Remove all addresses from this interface.
2572 		 */
2573 		addrconf_ifdown(dev, event != NETDEV_DOWN);
2574 		break;
2575 
2576 	case NETDEV_CHANGENAME:
2577 		if (idev) {
2578 			snmp6_unregister_dev(idev);
2579 			addrconf_sysctl_unregister(idev);
2580 			addrconf_sysctl_register(idev);
2581 			err = snmp6_register_dev(idev);
2582 			if (err)
2583 				return notifier_from_errno(err);
2584 		}
2585 		break;
2586 	case NETDEV_BONDING_OLDTYPE:
2587 	case NETDEV_BONDING_NEWTYPE:
2588 		addrconf_bonding_change(dev, event);
2589 		break;
2590 	}
2591 
2592 	return NOTIFY_OK;
2593 }
2594 
2595 /*
2596  *	addrconf module should be notified of a device going up
2597  */
2598 static struct notifier_block ipv6_dev_notf = {
2599 	.notifier_call = addrconf_notify,
2600 	.priority = 0
2601 };
2602 
2603 static void addrconf_bonding_change(struct net_device *dev, unsigned long event)
2604 {
2605 	struct inet6_dev *idev;
2606 	ASSERT_RTNL();
2607 
2608 	idev = __in6_dev_get(dev);
2609 
2610 	if (event == NETDEV_BONDING_NEWTYPE)
2611 		ipv6_mc_remap(idev);
2612 	else if (event == NETDEV_BONDING_OLDTYPE)
2613 		ipv6_mc_unmap(idev);
2614 }
2615 
2616 static int addrconf_ifdown(struct net_device *dev, int how)
2617 {
2618 	struct inet6_dev *idev;
2619 	struct inet6_ifaddr *ifa, **bifa;
2620 	struct net *net = dev_net(dev);
2621 	int i;
2622 
2623 	ASSERT_RTNL();
2624 
2625 	rt6_ifdown(net, dev);
2626 	neigh_ifdown(&nd_tbl, dev);
2627 
2628 	idev = __in6_dev_get(dev);
2629 	if (idev == NULL)
2630 		return -ENODEV;
2631 
2632 	/* Step 1: remove reference to ipv6 device from parent device.
2633 		   Do not dev_put!
2634 	 */
2635 	if (how) {
2636 		idev->dead = 1;
2637 
2638 		/* protected by rtnl_lock */
2639 		rcu_assign_pointer(dev->ip6_ptr, NULL);
2640 
2641 		/* Step 1.5: remove snmp6 entry */
2642 		snmp6_unregister_dev(idev);
2643 
2644 	}
2645 
2646 	/* Step 2: clear hash table */
2647 	for (i=0; i<IN6_ADDR_HSIZE; i++) {
2648 		bifa = &inet6_addr_lst[i];
2649 
2650 		write_lock_bh(&addrconf_hash_lock);
2651 		while ((ifa = *bifa) != NULL) {
2652 			if (ifa->idev == idev) {
2653 				*bifa = ifa->lst_next;
2654 				ifa->lst_next = NULL;
2655 				addrconf_del_timer(ifa);
2656 				in6_ifa_put(ifa);
2657 				continue;
2658 			}
2659 			bifa = &ifa->lst_next;
2660 		}
2661 		write_unlock_bh(&addrconf_hash_lock);
2662 	}
2663 
2664 	write_lock_bh(&idev->lock);
2665 
2666 	/* Step 3: clear flags for stateless addrconf */
2667 	if (!how)
2668 		idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2669 
2670 	/* Step 4: clear address list */
2671 #ifdef CONFIG_IPV6_PRIVACY
2672 	if (how && del_timer(&idev->regen_timer))
2673 		in6_dev_put(idev);
2674 
2675 	/* clear tempaddr list */
2676 	while ((ifa = idev->tempaddr_list) != NULL) {
2677 		idev->tempaddr_list = ifa->tmp_next;
2678 		ifa->tmp_next = NULL;
2679 		ifa->dead = 1;
2680 		write_unlock_bh(&idev->lock);
2681 		spin_lock_bh(&ifa->lock);
2682 
2683 		if (ifa->ifpub) {
2684 			in6_ifa_put(ifa->ifpub);
2685 			ifa->ifpub = NULL;
2686 		}
2687 		spin_unlock_bh(&ifa->lock);
2688 		in6_ifa_put(ifa);
2689 		write_lock_bh(&idev->lock);
2690 	}
2691 #endif
2692 	while ((ifa = idev->addr_list) != NULL) {
2693 		idev->addr_list = ifa->if_next;
2694 		ifa->if_next = NULL;
2695 		ifa->dead = 1;
2696 		addrconf_del_timer(ifa);
2697 		write_unlock_bh(&idev->lock);
2698 
2699 		__ipv6_ifa_notify(RTM_DELADDR, ifa);
2700 		atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2701 		in6_ifa_put(ifa);
2702 
2703 		write_lock_bh(&idev->lock);
2704 	}
2705 	write_unlock_bh(&idev->lock);
2706 
2707 	/* Step 5: Discard multicast list */
2708 
2709 	if (how)
2710 		ipv6_mc_destroy_dev(idev);
2711 	else
2712 		ipv6_mc_down(idev);
2713 
2714 	idev->tstamp = jiffies;
2715 
2716 	/* Shot the device (if unregistered) */
2717 
2718 	if (how) {
2719 		addrconf_sysctl_unregister(idev);
2720 		neigh_parms_release(&nd_tbl, idev->nd_parms);
2721 		neigh_ifdown(&nd_tbl, dev);
2722 		in6_dev_put(idev);
2723 	}
2724 	return 0;
2725 }
2726 
2727 static void addrconf_rs_timer(unsigned long data)
2728 {
2729 	struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2730 
2731 	if (ifp->idev->cnf.forwarding)
2732 		goto out;
2733 
2734 	if (ifp->idev->if_flags & IF_RA_RCVD) {
2735 		/*
2736 		 *	Announcement received after solicitation
2737 		 *	was sent
2738 		 */
2739 		goto out;
2740 	}
2741 
2742 	spin_lock(&ifp->lock);
2743 	if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2744 		/* The wait after the last probe can be shorter */
2745 		addrconf_mod_timer(ifp, AC_RS,
2746 				   (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2747 				   ifp->idev->cnf.rtr_solicit_delay :
2748 				   ifp->idev->cnf.rtr_solicit_interval);
2749 		spin_unlock(&ifp->lock);
2750 
2751 		ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2752 	} else {
2753 		spin_unlock(&ifp->lock);
2754 		/*
2755 		 * Note: we do not support deprecated "all on-link"
2756 		 * assumption any longer.
2757 		 */
2758 		printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2759 		       ifp->idev->dev->name);
2760 	}
2761 
2762 out:
2763 	in6_ifa_put(ifp);
2764 }
2765 
2766 /*
2767  *	Duplicate Address Detection
2768  */
2769 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2770 {
2771 	unsigned long rand_num;
2772 	struct inet6_dev *idev = ifp->idev;
2773 
2774 	if (ifp->flags & IFA_F_OPTIMISTIC)
2775 		rand_num = 0;
2776 	else
2777 		rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2778 
2779 	ifp->probes = idev->cnf.dad_transmits;
2780 	addrconf_mod_timer(ifp, AC_DAD, rand_num);
2781 }
2782 
2783 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2784 {
2785 	struct inet6_dev *idev = ifp->idev;
2786 	struct net_device *dev = idev->dev;
2787 
2788 	addrconf_join_solict(dev, &ifp->addr);
2789 
2790 	net_srandom(ifp->addr.s6_addr32[3]);
2791 
2792 	read_lock_bh(&idev->lock);
2793 	if (ifp->dead)
2794 		goto out;
2795 	spin_lock_bh(&ifp->lock);
2796 
2797 	if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2798 	    idev->cnf.accept_dad < 1 ||
2799 	    !(ifp->flags&IFA_F_TENTATIVE) ||
2800 	    ifp->flags & IFA_F_NODAD) {
2801 		ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
2802 		spin_unlock_bh(&ifp->lock);
2803 		read_unlock_bh(&idev->lock);
2804 
2805 		addrconf_dad_completed(ifp);
2806 		return;
2807 	}
2808 
2809 	if (!(idev->if_flags & IF_READY)) {
2810 		spin_unlock_bh(&ifp->lock);
2811 		read_unlock_bh(&idev->lock);
2812 		/*
2813 		 * If the device is not ready:
2814 		 * - keep it tentative if it is a permanent address.
2815 		 * - otherwise, kill it.
2816 		 */
2817 		in6_ifa_hold(ifp);
2818 		addrconf_dad_stop(ifp, 0);
2819 		return;
2820 	}
2821 
2822 	/*
2823 	 * Optimistic nodes can start receiving
2824 	 * Frames right away
2825 	 */
2826 	if(ifp->flags & IFA_F_OPTIMISTIC)
2827 		ip6_ins_rt(ifp->rt);
2828 
2829 	addrconf_dad_kick(ifp);
2830 	spin_unlock_bh(&ifp->lock);
2831 out:
2832 	read_unlock_bh(&idev->lock);
2833 }
2834 
2835 static void addrconf_dad_timer(unsigned long data)
2836 {
2837 	struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2838 	struct inet6_dev *idev = ifp->idev;
2839 	struct in6_addr mcaddr;
2840 
2841 	read_lock_bh(&idev->lock);
2842 	if (idev->dead) {
2843 		read_unlock_bh(&idev->lock);
2844 		goto out;
2845 	}
2846 	spin_lock_bh(&ifp->lock);
2847 	if (ifp->probes == 0) {
2848 		/*
2849 		 * DAD was successful
2850 		 */
2851 
2852 		ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
2853 		spin_unlock_bh(&ifp->lock);
2854 		read_unlock_bh(&idev->lock);
2855 
2856 		addrconf_dad_completed(ifp);
2857 
2858 		goto out;
2859 	}
2860 
2861 	ifp->probes--;
2862 	addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2863 	spin_unlock_bh(&ifp->lock);
2864 	read_unlock_bh(&idev->lock);
2865 
2866 	/* send a neighbour solicitation for our addr */
2867 	addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2868 	ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
2869 out:
2870 	in6_ifa_put(ifp);
2871 }
2872 
2873 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2874 {
2875 	struct net_device *	dev = ifp->idev->dev;
2876 
2877 	/*
2878 	 *	Configure the address for reception. Now it is valid.
2879 	 */
2880 
2881 	ipv6_ifa_notify(RTM_NEWADDR, ifp);
2882 
2883 	/* If added prefix is link local and forwarding is off,
2884 	   start sending router solicitations.
2885 	 */
2886 
2887 	if (ifp->idev->cnf.forwarding == 0 &&
2888 	    ifp->idev->cnf.rtr_solicits > 0 &&
2889 	    (dev->flags&IFF_LOOPBACK) == 0 &&
2890 	    (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2891 		/*
2892 		 *	If a host as already performed a random delay
2893 		 *	[...] as part of DAD [...] there is no need
2894 		 *	to delay again before sending the first RS
2895 		 */
2896 		ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2897 
2898 		spin_lock_bh(&ifp->lock);
2899 		ifp->probes = 1;
2900 		ifp->idev->if_flags |= IF_RS_SENT;
2901 		addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2902 		spin_unlock_bh(&ifp->lock);
2903 	}
2904 }
2905 
2906 static void addrconf_dad_run(struct inet6_dev *idev) {
2907 	struct inet6_ifaddr *ifp;
2908 
2909 	read_lock_bh(&idev->lock);
2910 	for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2911 		spin_lock_bh(&ifp->lock);
2912 		if (!(ifp->flags & IFA_F_TENTATIVE)) {
2913 			spin_unlock_bh(&ifp->lock);
2914 			continue;
2915 		}
2916 		spin_unlock_bh(&ifp->lock);
2917 		addrconf_dad_kick(ifp);
2918 	}
2919 	read_unlock_bh(&idev->lock);
2920 }
2921 
2922 #ifdef CONFIG_PROC_FS
2923 struct if6_iter_state {
2924 	struct seq_net_private p;
2925 	int bucket;
2926 };
2927 
2928 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2929 {
2930 	struct inet6_ifaddr *ifa = NULL;
2931 	struct if6_iter_state *state = seq->private;
2932 	struct net *net = seq_file_net(seq);
2933 
2934 	for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2935 		ifa = inet6_addr_lst[state->bucket];
2936 
2937 		while (ifa && !net_eq(dev_net(ifa->idev->dev), net))
2938 			ifa = ifa->lst_next;
2939 		if (ifa)
2940 			break;
2941 	}
2942 	return ifa;
2943 }
2944 
2945 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2946 {
2947 	struct if6_iter_state *state = seq->private;
2948 	struct net *net = seq_file_net(seq);
2949 
2950 	ifa = ifa->lst_next;
2951 try_again:
2952 	if (ifa) {
2953 		if (!net_eq(dev_net(ifa->idev->dev), net)) {
2954 			ifa = ifa->lst_next;
2955 			goto try_again;
2956 		}
2957 	}
2958 
2959 	if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2960 		ifa = inet6_addr_lst[state->bucket];
2961 		goto try_again;
2962 	}
2963 
2964 	return ifa;
2965 }
2966 
2967 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2968 {
2969 	struct inet6_ifaddr *ifa = if6_get_first(seq);
2970 
2971 	if (ifa)
2972 		while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2973 			--pos;
2974 	return pos ? NULL : ifa;
2975 }
2976 
2977 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2978 	__acquires(addrconf_hash_lock)
2979 {
2980 	read_lock_bh(&addrconf_hash_lock);
2981 	return if6_get_idx(seq, *pos);
2982 }
2983 
2984 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2985 {
2986 	struct inet6_ifaddr *ifa;
2987 
2988 	ifa = if6_get_next(seq, v);
2989 	++*pos;
2990 	return ifa;
2991 }
2992 
2993 static void if6_seq_stop(struct seq_file *seq, void *v)
2994 	__releases(addrconf_hash_lock)
2995 {
2996 	read_unlock_bh(&addrconf_hash_lock);
2997 }
2998 
2999 static int if6_seq_show(struct seq_file *seq, void *v)
3000 {
3001 	struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3002 	seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3003 		   &ifp->addr,
3004 		   ifp->idev->dev->ifindex,
3005 		   ifp->prefix_len,
3006 		   ifp->scope,
3007 		   ifp->flags,
3008 		   ifp->idev->dev->name);
3009 	return 0;
3010 }
3011 
3012 static const struct seq_operations if6_seq_ops = {
3013 	.start	= if6_seq_start,
3014 	.next	= if6_seq_next,
3015 	.show	= if6_seq_show,
3016 	.stop	= if6_seq_stop,
3017 };
3018 
3019 static int if6_seq_open(struct inode *inode, struct file *file)
3020 {
3021 	return seq_open_net(inode, file, &if6_seq_ops,
3022 			    sizeof(struct if6_iter_state));
3023 }
3024 
3025 static const struct file_operations if6_fops = {
3026 	.owner		= THIS_MODULE,
3027 	.open		= if6_seq_open,
3028 	.read		= seq_read,
3029 	.llseek		= seq_lseek,
3030 	.release	= seq_release_net,
3031 };
3032 
3033 static int if6_proc_net_init(struct net *net)
3034 {
3035 	if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
3036 		return -ENOMEM;
3037 	return 0;
3038 }
3039 
3040 static void if6_proc_net_exit(struct net *net)
3041 {
3042        proc_net_remove(net, "if_inet6");
3043 }
3044 
3045 static struct pernet_operations if6_proc_net_ops = {
3046        .init = if6_proc_net_init,
3047        .exit = if6_proc_net_exit,
3048 };
3049 
3050 int __init if6_proc_init(void)
3051 {
3052 	return register_pernet_subsys(&if6_proc_net_ops);
3053 }
3054 
3055 void if6_proc_exit(void)
3056 {
3057 	unregister_pernet_subsys(&if6_proc_net_ops);
3058 }
3059 #endif	/* CONFIG_PROC_FS */
3060 
3061 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3062 /* Check if address is a home address configured on any interface. */
3063 int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr)
3064 {
3065 	int ret = 0;
3066 	struct inet6_ifaddr * ifp;
3067 	u8 hash = ipv6_addr_hash(addr);
3068 	read_lock_bh(&addrconf_hash_lock);
3069 	for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) {
3070 		if (!net_eq(dev_net(ifp->idev->dev), net))
3071 			continue;
3072 		if (ipv6_addr_equal(&ifp->addr, addr) &&
3073 		    (ifp->flags & IFA_F_HOMEADDRESS)) {
3074 			ret = 1;
3075 			break;
3076 		}
3077 	}
3078 	read_unlock_bh(&addrconf_hash_lock);
3079 	return ret;
3080 }
3081 #endif
3082 
3083 /*
3084  *	Periodic address status verification
3085  */
3086 
3087 static void addrconf_verify(unsigned long foo)
3088 {
3089 	struct inet6_ifaddr *ifp;
3090 	unsigned long now, next;
3091 	int i;
3092 
3093 	spin_lock_bh(&addrconf_verify_lock);
3094 	now = jiffies;
3095 	next = now + ADDR_CHECK_FREQUENCY;
3096 
3097 	del_timer(&addr_chk_timer);
3098 
3099 	for (i=0; i < IN6_ADDR_HSIZE; i++) {
3100 
3101 restart:
3102 		read_lock(&addrconf_hash_lock);
3103 		for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
3104 			unsigned long age;
3105 #ifdef CONFIG_IPV6_PRIVACY
3106 			unsigned long regen_advance;
3107 #endif
3108 
3109 			if (ifp->flags & IFA_F_PERMANENT)
3110 				continue;
3111 
3112 			spin_lock(&ifp->lock);
3113 			age = (now - ifp->tstamp) / HZ;
3114 
3115 #ifdef CONFIG_IPV6_PRIVACY
3116 			regen_advance = ifp->idev->cnf.regen_max_retry *
3117 					ifp->idev->cnf.dad_transmits *
3118 					ifp->idev->nd_parms->retrans_time / HZ;
3119 #endif
3120 
3121 			if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3122 			    age >= ifp->valid_lft) {
3123 				spin_unlock(&ifp->lock);
3124 				in6_ifa_hold(ifp);
3125 				read_unlock(&addrconf_hash_lock);
3126 				ipv6_del_addr(ifp);
3127 				goto restart;
3128 			} else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3129 				spin_unlock(&ifp->lock);
3130 				continue;
3131 			} else if (age >= ifp->prefered_lft) {
3132 				/* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3133 				int deprecate = 0;
3134 
3135 				if (!(ifp->flags&IFA_F_DEPRECATED)) {
3136 					deprecate = 1;
3137 					ifp->flags |= IFA_F_DEPRECATED;
3138 				}
3139 
3140 				if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3141 					next = ifp->tstamp + ifp->valid_lft * HZ;
3142 
3143 				spin_unlock(&ifp->lock);
3144 
3145 				if (deprecate) {
3146 					in6_ifa_hold(ifp);
3147 					read_unlock(&addrconf_hash_lock);
3148 
3149 					ipv6_ifa_notify(0, ifp);
3150 					in6_ifa_put(ifp);
3151 					goto restart;
3152 				}
3153 #ifdef CONFIG_IPV6_PRIVACY
3154 			} else if ((ifp->flags&IFA_F_TEMPORARY) &&
3155 				   !(ifp->flags&IFA_F_TENTATIVE)) {
3156 				if (age >= ifp->prefered_lft - regen_advance) {
3157 					struct inet6_ifaddr *ifpub = ifp->ifpub;
3158 					if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3159 						next = ifp->tstamp + ifp->prefered_lft * HZ;
3160 					if (!ifp->regen_count && ifpub) {
3161 						ifp->regen_count++;
3162 						in6_ifa_hold(ifp);
3163 						in6_ifa_hold(ifpub);
3164 						spin_unlock(&ifp->lock);
3165 						read_unlock(&addrconf_hash_lock);
3166 						spin_lock(&ifpub->lock);
3167 						ifpub->regen_count = 0;
3168 						spin_unlock(&ifpub->lock);
3169 						ipv6_create_tempaddr(ifpub, ifp);
3170 						in6_ifa_put(ifpub);
3171 						in6_ifa_put(ifp);
3172 						goto restart;
3173 					}
3174 				} else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3175 					next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3176 				spin_unlock(&ifp->lock);
3177 #endif
3178 			} else {
3179 				/* ifp->prefered_lft <= ifp->valid_lft */
3180 				if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3181 					next = ifp->tstamp + ifp->prefered_lft * HZ;
3182 				spin_unlock(&ifp->lock);
3183 			}
3184 		}
3185 		read_unlock(&addrconf_hash_lock);
3186 	}
3187 
3188 	addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
3189 	add_timer(&addr_chk_timer);
3190 	spin_unlock_bh(&addrconf_verify_lock);
3191 }
3192 
3193 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3194 {
3195 	struct in6_addr *pfx = NULL;
3196 
3197 	if (addr)
3198 		pfx = nla_data(addr);
3199 
3200 	if (local) {
3201 		if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3202 			pfx = NULL;
3203 		else
3204 			pfx = nla_data(local);
3205 	}
3206 
3207 	return pfx;
3208 }
3209 
3210 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3211 	[IFA_ADDRESS]		= { .len = sizeof(struct in6_addr) },
3212 	[IFA_LOCAL]		= { .len = sizeof(struct in6_addr) },
3213 	[IFA_CACHEINFO]		= { .len = sizeof(struct ifa_cacheinfo) },
3214 };
3215 
3216 static int
3217 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3218 {
3219 	struct net *net = sock_net(skb->sk);
3220 	struct ifaddrmsg *ifm;
3221 	struct nlattr *tb[IFA_MAX+1];
3222 	struct in6_addr *pfx;
3223 	int err;
3224 
3225 	err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3226 	if (err < 0)
3227 		return err;
3228 
3229 	ifm = nlmsg_data(nlh);
3230 	pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3231 	if (pfx == NULL)
3232 		return -EINVAL;
3233 
3234 	return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3235 }
3236 
3237 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3238 			     u32 prefered_lft, u32 valid_lft)
3239 {
3240 	u32 flags;
3241 	clock_t expires;
3242 	unsigned long timeout;
3243 
3244 	if (!valid_lft || (prefered_lft > valid_lft))
3245 		return -EINVAL;
3246 
3247 	timeout = addrconf_timeout_fixup(valid_lft, HZ);
3248 	if (addrconf_finite_timeout(timeout)) {
3249 		expires = jiffies_to_clock_t(timeout * HZ);
3250 		valid_lft = timeout;
3251 		flags = RTF_EXPIRES;
3252 	} else {
3253 		expires = 0;
3254 		flags = 0;
3255 		ifa_flags |= IFA_F_PERMANENT;
3256 	}
3257 
3258 	timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3259 	if (addrconf_finite_timeout(timeout)) {
3260 		if (timeout == 0)
3261 			ifa_flags |= IFA_F_DEPRECATED;
3262 		prefered_lft = timeout;
3263 	}
3264 
3265 	spin_lock_bh(&ifp->lock);
3266 	ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3267 	ifp->tstamp = jiffies;
3268 	ifp->valid_lft = valid_lft;
3269 	ifp->prefered_lft = prefered_lft;
3270 
3271 	spin_unlock_bh(&ifp->lock);
3272 	if (!(ifp->flags&IFA_F_TENTATIVE))
3273 		ipv6_ifa_notify(0, ifp);
3274 
3275 	addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3276 			      expires, flags);
3277 	addrconf_verify(0);
3278 
3279 	return 0;
3280 }
3281 
3282 static int
3283 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3284 {
3285 	struct net *net = sock_net(skb->sk);
3286 	struct ifaddrmsg *ifm;
3287 	struct nlattr *tb[IFA_MAX+1];
3288 	struct in6_addr *pfx;
3289 	struct inet6_ifaddr *ifa;
3290 	struct net_device *dev;
3291 	u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3292 	u8 ifa_flags;
3293 	int err;
3294 
3295 	err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3296 	if (err < 0)
3297 		return err;
3298 
3299 	ifm = nlmsg_data(nlh);
3300 	pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3301 	if (pfx == NULL)
3302 		return -EINVAL;
3303 
3304 	if (tb[IFA_CACHEINFO]) {
3305 		struct ifa_cacheinfo *ci;
3306 
3307 		ci = nla_data(tb[IFA_CACHEINFO]);
3308 		valid_lft = ci->ifa_valid;
3309 		preferred_lft = ci->ifa_prefered;
3310 	} else {
3311 		preferred_lft = INFINITY_LIFE_TIME;
3312 		valid_lft = INFINITY_LIFE_TIME;
3313 	}
3314 
3315 	dev =  __dev_get_by_index(net, ifm->ifa_index);
3316 	if (dev == NULL)
3317 		return -ENODEV;
3318 
3319 	/* We ignore other flags so far. */
3320 	ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3321 
3322 	ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3323 	if (ifa == NULL) {
3324 		/*
3325 		 * It would be best to check for !NLM_F_CREATE here but
3326 		 * userspace alreay relies on not having to provide this.
3327 		 */
3328 		return inet6_addr_add(net, ifm->ifa_index, pfx,
3329 				      ifm->ifa_prefixlen, ifa_flags,
3330 				      preferred_lft, valid_lft);
3331 	}
3332 
3333 	if (nlh->nlmsg_flags & NLM_F_EXCL ||
3334 	    !(nlh->nlmsg_flags & NLM_F_REPLACE))
3335 		err = -EEXIST;
3336 	else
3337 		err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3338 
3339 	in6_ifa_put(ifa);
3340 
3341 	return err;
3342 }
3343 
3344 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3345 			  u8 scope, int ifindex)
3346 {
3347 	struct ifaddrmsg *ifm;
3348 
3349 	ifm = nlmsg_data(nlh);
3350 	ifm->ifa_family = AF_INET6;
3351 	ifm->ifa_prefixlen = prefixlen;
3352 	ifm->ifa_flags = flags;
3353 	ifm->ifa_scope = scope;
3354 	ifm->ifa_index = ifindex;
3355 }
3356 
3357 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3358 			 unsigned long tstamp, u32 preferred, u32 valid)
3359 {
3360 	struct ifa_cacheinfo ci;
3361 
3362 	ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3363 			+ TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3364 	ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3365 			+ TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3366 	ci.ifa_prefered = preferred;
3367 	ci.ifa_valid = valid;
3368 
3369 	return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3370 }
3371 
3372 static inline int rt_scope(int ifa_scope)
3373 {
3374 	if (ifa_scope & IFA_HOST)
3375 		return RT_SCOPE_HOST;
3376 	else if (ifa_scope & IFA_LINK)
3377 		return RT_SCOPE_LINK;
3378 	else if (ifa_scope & IFA_SITE)
3379 		return RT_SCOPE_SITE;
3380 	else
3381 		return RT_SCOPE_UNIVERSE;
3382 }
3383 
3384 static inline int inet6_ifaddr_msgsize(void)
3385 {
3386 	return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3387 	       + nla_total_size(16) /* IFA_ADDRESS */
3388 	       + nla_total_size(sizeof(struct ifa_cacheinfo));
3389 }
3390 
3391 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3392 			     u32 pid, u32 seq, int event, unsigned int flags)
3393 {
3394 	struct nlmsghdr  *nlh;
3395 	u32 preferred, valid;
3396 
3397 	nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3398 	if (nlh == NULL)
3399 		return -EMSGSIZE;
3400 
3401 	put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3402 		      ifa->idev->dev->ifindex);
3403 
3404 	if (!(ifa->flags&IFA_F_PERMANENT)) {
3405 		preferred = ifa->prefered_lft;
3406 		valid = ifa->valid_lft;
3407 		if (preferred != INFINITY_LIFE_TIME) {
3408 			long tval = (jiffies - ifa->tstamp)/HZ;
3409 			if (preferred > tval)
3410 				preferred -= tval;
3411 			else
3412 				preferred = 0;
3413 			if (valid != INFINITY_LIFE_TIME)
3414 				valid -= tval;
3415 		}
3416 	} else {
3417 		preferred = INFINITY_LIFE_TIME;
3418 		valid = INFINITY_LIFE_TIME;
3419 	}
3420 
3421 	if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3422 	    put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3423 		nlmsg_cancel(skb, nlh);
3424 		return -EMSGSIZE;
3425 	}
3426 
3427 	return nlmsg_end(skb, nlh);
3428 }
3429 
3430 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3431 				u32 pid, u32 seq, int event, u16 flags)
3432 {
3433 	struct nlmsghdr  *nlh;
3434 	u8 scope = RT_SCOPE_UNIVERSE;
3435 	int ifindex = ifmca->idev->dev->ifindex;
3436 
3437 	if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3438 		scope = RT_SCOPE_SITE;
3439 
3440 	nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3441 	if (nlh == NULL)
3442 		return -EMSGSIZE;
3443 
3444 	put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3445 	if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3446 	    put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3447 			  INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3448 		nlmsg_cancel(skb, nlh);
3449 		return -EMSGSIZE;
3450 	}
3451 
3452 	return nlmsg_end(skb, nlh);
3453 }
3454 
3455 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3456 				u32 pid, u32 seq, int event, unsigned int flags)
3457 {
3458 	struct nlmsghdr  *nlh;
3459 	u8 scope = RT_SCOPE_UNIVERSE;
3460 	int ifindex = ifaca->aca_idev->dev->ifindex;
3461 
3462 	if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3463 		scope = RT_SCOPE_SITE;
3464 
3465 	nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3466 	if (nlh == NULL)
3467 		return -EMSGSIZE;
3468 
3469 	put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3470 	if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3471 	    put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3472 			  INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3473 		nlmsg_cancel(skb, nlh);
3474 		return -EMSGSIZE;
3475 	}
3476 
3477 	return nlmsg_end(skb, nlh);
3478 }
3479 
3480 enum addr_type_t
3481 {
3482 	UNICAST_ADDR,
3483 	MULTICAST_ADDR,
3484 	ANYCAST_ADDR,
3485 };
3486 
3487 /* called with rcu_read_lock() */
3488 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3489 			  struct netlink_callback *cb, enum addr_type_t type,
3490 			  int s_ip_idx, int *p_ip_idx)
3491 {
3492 	struct inet6_ifaddr *ifa;
3493 	struct ifmcaddr6 *ifmca;
3494 	struct ifacaddr6 *ifaca;
3495 	int err = 1;
3496 	int ip_idx = *p_ip_idx;
3497 
3498 	read_lock_bh(&idev->lock);
3499 	switch (type) {
3500 	case UNICAST_ADDR:
3501 		/* unicast address incl. temp addr */
3502 		for (ifa = idev->addr_list; ifa;
3503 		     ifa = ifa->if_next, ip_idx++) {
3504 			if (ip_idx < s_ip_idx)
3505 				continue;
3506 			err = inet6_fill_ifaddr(skb, ifa,
3507 						NETLINK_CB(cb->skb).pid,
3508 						cb->nlh->nlmsg_seq,
3509 						RTM_NEWADDR,
3510 						NLM_F_MULTI);
3511 			if (err <= 0)
3512 				break;
3513 		}
3514 		break;
3515 	case MULTICAST_ADDR:
3516 		/* multicast address */
3517 		for (ifmca = idev->mc_list; ifmca;
3518 		     ifmca = ifmca->next, ip_idx++) {
3519 			if (ip_idx < s_ip_idx)
3520 				continue;
3521 			err = inet6_fill_ifmcaddr(skb, ifmca,
3522 						  NETLINK_CB(cb->skb).pid,
3523 						  cb->nlh->nlmsg_seq,
3524 						  RTM_GETMULTICAST,
3525 						  NLM_F_MULTI);
3526 			if (err <= 0)
3527 				break;
3528 		}
3529 		break;
3530 	case ANYCAST_ADDR:
3531 		/* anycast address */
3532 		for (ifaca = idev->ac_list; ifaca;
3533 		     ifaca = ifaca->aca_next, ip_idx++) {
3534 			if (ip_idx < s_ip_idx)
3535 				continue;
3536 			err = inet6_fill_ifacaddr(skb, ifaca,
3537 						  NETLINK_CB(cb->skb).pid,
3538 						  cb->nlh->nlmsg_seq,
3539 						  RTM_GETANYCAST,
3540 						  NLM_F_MULTI);
3541 			if (err <= 0)
3542 				break;
3543 		}
3544 		break;
3545 	default:
3546 		break;
3547 	}
3548 	read_unlock_bh(&idev->lock);
3549 	*p_ip_idx = ip_idx;
3550 	return err;
3551 }
3552 
3553 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3554 			   enum addr_type_t type)
3555 {
3556 	struct net *net = sock_net(skb->sk);
3557 	int h, s_h;
3558 	int idx, ip_idx;
3559 	int s_idx, s_ip_idx;
3560 	struct net_device *dev;
3561 	struct inet6_dev *idev;
3562 	struct hlist_head *head;
3563 	struct hlist_node *node;
3564 
3565 	s_h = cb->args[0];
3566 	s_idx = idx = cb->args[1];
3567 	s_ip_idx = ip_idx = cb->args[2];
3568 
3569 	rcu_read_lock();
3570 	for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3571 		idx = 0;
3572 		head = &net->dev_index_head[h];
3573 		hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3574 			if (idx < s_idx)
3575 				goto cont;
3576 			if (idx > s_idx)
3577 				s_ip_idx = 0;
3578 			ip_idx = 0;
3579 			if ((idev = __in6_dev_get(dev)) == NULL)
3580 				goto cont;
3581 
3582 			if (in6_dump_addrs(idev, skb, cb, type,
3583 					   s_ip_idx, &ip_idx) <= 0)
3584 				goto done;
3585 cont:
3586 			idx++;
3587 		}
3588 	}
3589 done:
3590 	rcu_read_unlock();
3591 	cb->args[0] = h;
3592 	cb->args[1] = idx;
3593 	cb->args[2] = ip_idx;
3594 
3595 	return skb->len;
3596 }
3597 
3598 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3599 {
3600 	enum addr_type_t type = UNICAST_ADDR;
3601 
3602 	return inet6_dump_addr(skb, cb, type);
3603 }
3604 
3605 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3606 {
3607 	enum addr_type_t type = MULTICAST_ADDR;
3608 
3609 	return inet6_dump_addr(skb, cb, type);
3610 }
3611 
3612 
3613 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3614 {
3615 	enum addr_type_t type = ANYCAST_ADDR;
3616 
3617 	return inet6_dump_addr(skb, cb, type);
3618 }
3619 
3620 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3621 			     void *arg)
3622 {
3623 	struct net *net = sock_net(in_skb->sk);
3624 	struct ifaddrmsg *ifm;
3625 	struct nlattr *tb[IFA_MAX+1];
3626 	struct in6_addr *addr = NULL;
3627 	struct net_device *dev = NULL;
3628 	struct inet6_ifaddr *ifa;
3629 	struct sk_buff *skb;
3630 	int err;
3631 
3632 	err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3633 	if (err < 0)
3634 		goto errout;
3635 
3636 	addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3637 	if (addr == NULL) {
3638 		err = -EINVAL;
3639 		goto errout;
3640 	}
3641 
3642 	ifm = nlmsg_data(nlh);
3643 	if (ifm->ifa_index)
3644 		dev = __dev_get_by_index(net, ifm->ifa_index);
3645 
3646 	if ((ifa = ipv6_get_ifaddr(net, addr, dev, 1)) == NULL) {
3647 		err = -EADDRNOTAVAIL;
3648 		goto errout;
3649 	}
3650 
3651 	if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) {
3652 		err = -ENOBUFS;
3653 		goto errout_ifa;
3654 	}
3655 
3656 	err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3657 				nlh->nlmsg_seq, RTM_NEWADDR, 0);
3658 	if (err < 0) {
3659 		/* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3660 		WARN_ON(err == -EMSGSIZE);
3661 		kfree_skb(skb);
3662 		goto errout_ifa;
3663 	}
3664 	err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
3665 errout_ifa:
3666 	in6_ifa_put(ifa);
3667 errout:
3668 	return err;
3669 }
3670 
3671 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3672 {
3673 	struct sk_buff *skb;
3674 	struct net *net = dev_net(ifa->idev->dev);
3675 	int err = -ENOBUFS;
3676 
3677 	skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3678 	if (skb == NULL)
3679 		goto errout;
3680 
3681 	err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3682 	if (err < 0) {
3683 		/* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3684 		WARN_ON(err == -EMSGSIZE);
3685 		kfree_skb(skb);
3686 		goto errout;
3687 	}
3688 	rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3689 	return;
3690 errout:
3691 	if (err < 0)
3692 		rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3693 }
3694 
3695 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3696 				__s32 *array, int bytes)
3697 {
3698 	BUG_ON(bytes < (DEVCONF_MAX * 4));
3699 
3700 	memset(array, 0, bytes);
3701 	array[DEVCONF_FORWARDING] = cnf->forwarding;
3702 	array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3703 	array[DEVCONF_MTU6] = cnf->mtu6;
3704 	array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3705 	array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3706 	array[DEVCONF_AUTOCONF] = cnf->autoconf;
3707 	array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3708 	array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3709 	array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3710 	array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3711 	array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3712 #ifdef CONFIG_IPV6_PRIVACY
3713 	array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3714 	array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3715 	array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3716 	array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3717 	array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3718 #endif
3719 	array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3720 	array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3721 	array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3722 #ifdef CONFIG_IPV6_ROUTER_PREF
3723 	array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3724 	array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
3725 #ifdef CONFIG_IPV6_ROUTE_INFO
3726 	array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3727 #endif
3728 #endif
3729 	array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3730 	array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3731 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3732 	array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3733 #endif
3734 #ifdef CONFIG_IPV6_MROUTE
3735 	array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
3736 #endif
3737 	array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
3738 	array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
3739 	array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
3740 }
3741 
3742 static inline size_t inet6_if_nlmsg_size(void)
3743 {
3744 	return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3745 	       + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3746 	       + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3747 	       + nla_total_size(4) /* IFLA_MTU */
3748 	       + nla_total_size(4) /* IFLA_LINK */
3749 	       + nla_total_size( /* IFLA_PROTINFO */
3750 			nla_total_size(4) /* IFLA_INET6_FLAGS */
3751 			+ nla_total_size(sizeof(struct ifla_cacheinfo))
3752 			+ nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3753 			+ nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3754 			+ nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
3755 		 );
3756 }
3757 
3758 static inline void __snmp6_fill_stats(u64 *stats, void **mib, int items,
3759 				      int bytes)
3760 {
3761 	int i;
3762 	int pad = bytes - sizeof(u64) * items;
3763 	BUG_ON(pad < 0);
3764 
3765 	/* Use put_unaligned() because stats may not be aligned for u64. */
3766 	put_unaligned(items, &stats[0]);
3767 	for (i = 1; i < items; i++)
3768 		put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3769 
3770 	memset(&stats[items], 0, pad);
3771 }
3772 
3773 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3774 			     int bytes)
3775 {
3776 	switch(attrtype) {
3777 	case IFLA_INET6_STATS:
3778 		__snmp6_fill_stats(stats, (void **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes);
3779 		break;
3780 	case IFLA_INET6_ICMP6STATS:
3781 		__snmp6_fill_stats(stats, (void **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
3782 		break;
3783 	}
3784 }
3785 
3786 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3787 			     u32 pid, u32 seq, int event, unsigned int flags)
3788 {
3789 	struct net_device *dev = idev->dev;
3790 	struct nlattr *nla;
3791 	struct ifinfomsg *hdr;
3792 	struct nlmsghdr *nlh;
3793 	void *protoinfo;
3794 	struct ifla_cacheinfo ci;
3795 
3796 	nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3797 	if (nlh == NULL)
3798 		return -EMSGSIZE;
3799 
3800 	hdr = nlmsg_data(nlh);
3801 	hdr->ifi_family = AF_INET6;
3802 	hdr->__ifi_pad = 0;
3803 	hdr->ifi_type = dev->type;
3804 	hdr->ifi_index = dev->ifindex;
3805 	hdr->ifi_flags = dev_get_flags(dev);
3806 	hdr->ifi_change = 0;
3807 
3808 	NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
3809 
3810 	if (dev->addr_len)
3811 		NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3812 
3813 	NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
3814 	if (dev->ifindex != dev->iflink)
3815 		NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
3816 
3817 	protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3818 	if (protoinfo == NULL)
3819 		goto nla_put_failure;
3820 
3821 	NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
3822 
3823 	ci.max_reasm_len = IPV6_MAXPLEN;
3824 	ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3825 		    + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3826 	ci.reachable_time = idev->nd_parms->reachable_time;
3827 	ci.retrans_time = idev->nd_parms->retrans_time;
3828 	NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3829 
3830 	nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3831 	if (nla == NULL)
3832 		goto nla_put_failure;
3833 	ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
3834 
3835 	/* XXX - MC not implemented */
3836 
3837 	nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3838 	if (nla == NULL)
3839 		goto nla_put_failure;
3840 	snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3841 
3842 	nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3843 	if (nla == NULL)
3844 		goto nla_put_failure;
3845 	snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
3846 
3847 	nla_nest_end(skb, protoinfo);
3848 	return nlmsg_end(skb, nlh);
3849 
3850 nla_put_failure:
3851 	nlmsg_cancel(skb, nlh);
3852 	return -EMSGSIZE;
3853 }
3854 
3855 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3856 {
3857 	struct net *net = sock_net(skb->sk);
3858 	int h, s_h;
3859 	int idx = 0, s_idx;
3860 	struct net_device *dev;
3861 	struct inet6_dev *idev;
3862 	struct hlist_head *head;
3863 	struct hlist_node *node;
3864 
3865 	s_h = cb->args[0];
3866 	s_idx = cb->args[1];
3867 
3868 	rcu_read_lock();
3869 	for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3870 		idx = 0;
3871 		head = &net->dev_index_head[h];
3872 		hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3873 			if (idx < s_idx)
3874 				goto cont;
3875 			idev = __in6_dev_get(dev);
3876 			if (!idev)
3877 				goto cont;
3878 			if (inet6_fill_ifinfo(skb, idev,
3879 					      NETLINK_CB(cb->skb).pid,
3880 					      cb->nlh->nlmsg_seq,
3881 					      RTM_NEWLINK, NLM_F_MULTI) <= 0)
3882 				goto out;
3883 cont:
3884 			idx++;
3885 		}
3886 	}
3887 out:
3888 	rcu_read_unlock();
3889 	cb->args[1] = idx;
3890 	cb->args[0] = h;
3891 
3892 	return skb->len;
3893 }
3894 
3895 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3896 {
3897 	struct sk_buff *skb;
3898 	struct net *net = dev_net(idev->dev);
3899 	int err = -ENOBUFS;
3900 
3901 	skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
3902 	if (skb == NULL)
3903 		goto errout;
3904 
3905 	err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
3906 	if (err < 0) {
3907 		/* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3908 		WARN_ON(err == -EMSGSIZE);
3909 		kfree_skb(skb);
3910 		goto errout;
3911 	}
3912 	rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3913 	return;
3914 errout:
3915 	if (err < 0)
3916 		rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3917 }
3918 
3919 static inline size_t inet6_prefix_nlmsg_size(void)
3920 {
3921 	return NLMSG_ALIGN(sizeof(struct prefixmsg))
3922 	       + nla_total_size(sizeof(struct in6_addr))
3923 	       + nla_total_size(sizeof(struct prefix_cacheinfo));
3924 }
3925 
3926 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
3927 			     struct prefix_info *pinfo, u32 pid, u32 seq,
3928 			     int event, unsigned int flags)
3929 {
3930 	struct prefixmsg *pmsg;
3931 	struct nlmsghdr *nlh;
3932 	struct prefix_cacheinfo	ci;
3933 
3934 	nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
3935 	if (nlh == NULL)
3936 		return -EMSGSIZE;
3937 
3938 	pmsg = nlmsg_data(nlh);
3939 	pmsg->prefix_family = AF_INET6;
3940 	pmsg->prefix_pad1 = 0;
3941 	pmsg->prefix_pad2 = 0;
3942 	pmsg->prefix_ifindex = idev->dev->ifindex;
3943 	pmsg->prefix_len = pinfo->prefix_len;
3944 	pmsg->prefix_type = pinfo->type;
3945 	pmsg->prefix_pad3 = 0;
3946 	pmsg->prefix_flags = 0;
3947 	if (pinfo->onlink)
3948 		pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3949 	if (pinfo->autoconf)
3950 		pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3951 
3952 	NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
3953 
3954 	ci.preferred_time = ntohl(pinfo->prefered);
3955 	ci.valid_time = ntohl(pinfo->valid);
3956 	NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
3957 
3958 	return nlmsg_end(skb, nlh);
3959 
3960 nla_put_failure:
3961 	nlmsg_cancel(skb, nlh);
3962 	return -EMSGSIZE;
3963 }
3964 
3965 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
3966 			 struct prefix_info *pinfo)
3967 {
3968 	struct sk_buff *skb;
3969 	struct net *net = dev_net(idev->dev);
3970 	int err = -ENOBUFS;
3971 
3972 	skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
3973 	if (skb == NULL)
3974 		goto errout;
3975 
3976 	err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
3977 	if (err < 0) {
3978 		/* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
3979 		WARN_ON(err == -EMSGSIZE);
3980 		kfree_skb(skb);
3981 		goto errout;
3982 	}
3983 	rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
3984 	return;
3985 errout:
3986 	if (err < 0)
3987 		rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
3988 }
3989 
3990 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3991 {
3992 	inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3993 
3994 	switch (event) {
3995 	case RTM_NEWADDR:
3996 		/*
3997 		 * If the address was optimistic
3998 		 * we inserted the route at the start of
3999 		 * our DAD process, so we don't need
4000 		 * to do it again
4001 		 */
4002 		if (!(ifp->rt->rt6i_node))
4003 			ip6_ins_rt(ifp->rt);
4004 		if (ifp->idev->cnf.forwarding)
4005 			addrconf_join_anycast(ifp);
4006 		break;
4007 	case RTM_DELADDR:
4008 		if (ifp->idev->cnf.forwarding)
4009 			addrconf_leave_anycast(ifp);
4010 		addrconf_leave_solict(ifp->idev, &ifp->addr);
4011 		dst_hold(&ifp->rt->u.dst);
4012 		if (ip6_del_rt(ifp->rt))
4013 			dst_free(&ifp->rt->u.dst);
4014 		break;
4015 	}
4016 }
4017 
4018 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4019 {
4020 	rcu_read_lock_bh();
4021 	if (likely(ifp->idev->dead == 0))
4022 		__ipv6_ifa_notify(event, ifp);
4023 	rcu_read_unlock_bh();
4024 }
4025 
4026 #ifdef CONFIG_SYSCTL
4027 
4028 static
4029 int addrconf_sysctl_forward(ctl_table *ctl, int write,
4030 			   void __user *buffer, size_t *lenp, loff_t *ppos)
4031 {
4032 	int *valp = ctl->data;
4033 	int val = *valp;
4034 	loff_t pos = *ppos;
4035 	int ret;
4036 
4037 	ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
4038 
4039 	if (write)
4040 		ret = addrconf_fixup_forwarding(ctl, valp, val);
4041 	if (ret)
4042 		*ppos = pos;
4043 	return ret;
4044 }
4045 
4046 static void dev_disable_change(struct inet6_dev *idev)
4047 {
4048 	if (!idev || !idev->dev)
4049 		return;
4050 
4051 	if (idev->cnf.disable_ipv6)
4052 		addrconf_notify(NULL, NETDEV_DOWN, idev->dev);
4053 	else
4054 		addrconf_notify(NULL, NETDEV_UP, idev->dev);
4055 }
4056 
4057 static void addrconf_disable_change(struct net *net, __s32 newf)
4058 {
4059 	struct net_device *dev;
4060 	struct inet6_dev *idev;
4061 
4062 	rcu_read_lock();
4063 	for_each_netdev_rcu(net, dev) {
4064 		idev = __in6_dev_get(dev);
4065 		if (idev) {
4066 			int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4067 			idev->cnf.disable_ipv6 = newf;
4068 			if (changed)
4069 				dev_disable_change(idev);
4070 		}
4071 	}
4072 	rcu_read_unlock();
4073 }
4074 
4075 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int old)
4076 {
4077 	struct net *net;
4078 
4079 	net = (struct net *)table->extra2;
4080 
4081 	if (p == &net->ipv6.devconf_dflt->disable_ipv6)
4082 		return 0;
4083 
4084 	if (!rtnl_trylock()) {
4085 		/* Restore the original values before restarting */
4086 		*p = old;
4087 		return restart_syscall();
4088 	}
4089 
4090 	if (p == &net->ipv6.devconf_all->disable_ipv6) {
4091 		__s32 newf = net->ipv6.devconf_all->disable_ipv6;
4092 		net->ipv6.devconf_dflt->disable_ipv6 = newf;
4093 		addrconf_disable_change(net, newf);
4094 	} else if ((!*p) ^ (!old))
4095 		dev_disable_change((struct inet6_dev *)table->extra1);
4096 
4097 	rtnl_unlock();
4098 	return 0;
4099 }
4100 
4101 static
4102 int addrconf_sysctl_disable(ctl_table *ctl, int write,
4103 			    void __user *buffer, size_t *lenp, loff_t *ppos)
4104 {
4105 	int *valp = ctl->data;
4106 	int val = *valp;
4107 	loff_t pos = *ppos;
4108 	int ret;
4109 
4110 	ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
4111 
4112 	if (write)
4113 		ret = addrconf_disable_ipv6(ctl, valp, val);
4114 	if (ret)
4115 		*ppos = pos;
4116 	return ret;
4117 }
4118 
4119 static struct addrconf_sysctl_table
4120 {
4121 	struct ctl_table_header *sysctl_header;
4122 	ctl_table addrconf_vars[DEVCONF_MAX+1];
4123 	char *dev_name;
4124 } addrconf_sysctl __read_mostly = {
4125 	.sysctl_header = NULL,
4126 	.addrconf_vars = {
4127 		{
4128 			.procname	=	"forwarding",
4129 			.data		=	&ipv6_devconf.forwarding,
4130 			.maxlen		=	sizeof(int),
4131 			.mode		=	0644,
4132 			.proc_handler	=	addrconf_sysctl_forward,
4133 		},
4134 		{
4135 			.procname	=	"hop_limit",
4136 			.data		=	&ipv6_devconf.hop_limit,
4137 			.maxlen		=	sizeof(int),
4138 			.mode		=	0644,
4139 			.proc_handler	=	proc_dointvec,
4140 		},
4141 		{
4142 			.procname	=	"mtu",
4143 			.data		=	&ipv6_devconf.mtu6,
4144 			.maxlen		=	sizeof(int),
4145 			.mode		=	0644,
4146 			.proc_handler	=	proc_dointvec,
4147 		},
4148 		{
4149 			.procname	=	"accept_ra",
4150 			.data		=	&ipv6_devconf.accept_ra,
4151 			.maxlen		=	sizeof(int),
4152 			.mode		=	0644,
4153 			.proc_handler	=	proc_dointvec,
4154 		},
4155 		{
4156 			.procname	=	"accept_redirects",
4157 			.data		=	&ipv6_devconf.accept_redirects,
4158 			.maxlen		=	sizeof(int),
4159 			.mode		=	0644,
4160 			.proc_handler	=	proc_dointvec,
4161 		},
4162 		{
4163 			.procname	=	"autoconf",
4164 			.data		=	&ipv6_devconf.autoconf,
4165 			.maxlen		=	sizeof(int),
4166 			.mode		=	0644,
4167 			.proc_handler	=	proc_dointvec,
4168 		},
4169 		{
4170 			.procname	=	"dad_transmits",
4171 			.data		=	&ipv6_devconf.dad_transmits,
4172 			.maxlen		=	sizeof(int),
4173 			.mode		=	0644,
4174 			.proc_handler	=	proc_dointvec,
4175 		},
4176 		{
4177 			.procname	=	"router_solicitations",
4178 			.data		=	&ipv6_devconf.rtr_solicits,
4179 			.maxlen		=	sizeof(int),
4180 			.mode		=	0644,
4181 			.proc_handler	=	proc_dointvec,
4182 		},
4183 		{
4184 			.procname	=	"router_solicitation_interval",
4185 			.data		=	&ipv6_devconf.rtr_solicit_interval,
4186 			.maxlen		=	sizeof(int),
4187 			.mode		=	0644,
4188 			.proc_handler	=	proc_dointvec_jiffies,
4189 		},
4190 		{
4191 			.procname	=	"router_solicitation_delay",
4192 			.data		=	&ipv6_devconf.rtr_solicit_delay,
4193 			.maxlen		=	sizeof(int),
4194 			.mode		=	0644,
4195 			.proc_handler	=	proc_dointvec_jiffies,
4196 		},
4197 		{
4198 			.procname	=	"force_mld_version",
4199 			.data		=	&ipv6_devconf.force_mld_version,
4200 			.maxlen		=	sizeof(int),
4201 			.mode		=	0644,
4202 			.proc_handler	=	proc_dointvec,
4203 		},
4204 #ifdef CONFIG_IPV6_PRIVACY
4205 		{
4206 			.procname	=	"use_tempaddr",
4207 			.data		=	&ipv6_devconf.use_tempaddr,
4208 			.maxlen		=	sizeof(int),
4209 			.mode		=	0644,
4210 			.proc_handler	=	proc_dointvec,
4211 		},
4212 		{
4213 			.procname	=	"temp_valid_lft",
4214 			.data		=	&ipv6_devconf.temp_valid_lft,
4215 			.maxlen		=	sizeof(int),
4216 			.mode		=	0644,
4217 			.proc_handler	=	proc_dointvec,
4218 		},
4219 		{
4220 			.procname	=	"temp_prefered_lft",
4221 			.data		=	&ipv6_devconf.temp_prefered_lft,
4222 			.maxlen		=	sizeof(int),
4223 			.mode		=	0644,
4224 			.proc_handler	=	proc_dointvec,
4225 		},
4226 		{
4227 			.procname	=	"regen_max_retry",
4228 			.data		=	&ipv6_devconf.regen_max_retry,
4229 			.maxlen		=	sizeof(int),
4230 			.mode		=	0644,
4231 			.proc_handler	=	proc_dointvec,
4232 		},
4233 		{
4234 			.procname	=	"max_desync_factor",
4235 			.data		=	&ipv6_devconf.max_desync_factor,
4236 			.maxlen		=	sizeof(int),
4237 			.mode		=	0644,
4238 			.proc_handler	=	proc_dointvec,
4239 		},
4240 #endif
4241 		{
4242 			.procname	=	"max_addresses",
4243 			.data		=	&ipv6_devconf.max_addresses,
4244 			.maxlen		=	sizeof(int),
4245 			.mode		=	0644,
4246 			.proc_handler	=	proc_dointvec,
4247 		},
4248 		{
4249 			.procname	=	"accept_ra_defrtr",
4250 			.data		=	&ipv6_devconf.accept_ra_defrtr,
4251 			.maxlen		=	sizeof(int),
4252 			.mode		=	0644,
4253 			.proc_handler	=	proc_dointvec,
4254 		},
4255 		{
4256 			.procname	=	"accept_ra_pinfo",
4257 			.data		=	&ipv6_devconf.accept_ra_pinfo,
4258 			.maxlen		=	sizeof(int),
4259 			.mode		=	0644,
4260 			.proc_handler	=	proc_dointvec,
4261 		},
4262 #ifdef CONFIG_IPV6_ROUTER_PREF
4263 		{
4264 			.procname	=	"accept_ra_rtr_pref",
4265 			.data		=	&ipv6_devconf.accept_ra_rtr_pref,
4266 			.maxlen		=	sizeof(int),
4267 			.mode		=	0644,
4268 			.proc_handler	=	proc_dointvec,
4269 		},
4270 		{
4271 			.procname	=	"router_probe_interval",
4272 			.data		=	&ipv6_devconf.rtr_probe_interval,
4273 			.maxlen		=	sizeof(int),
4274 			.mode		=	0644,
4275 			.proc_handler	=	proc_dointvec_jiffies,
4276 		},
4277 #ifdef CONFIG_IPV6_ROUTE_INFO
4278 		{
4279 			.procname	=	"accept_ra_rt_info_max_plen",
4280 			.data		=	&ipv6_devconf.accept_ra_rt_info_max_plen,
4281 			.maxlen		=	sizeof(int),
4282 			.mode		=	0644,
4283 			.proc_handler	=	proc_dointvec,
4284 		},
4285 #endif
4286 #endif
4287 		{
4288 			.procname	=	"proxy_ndp",
4289 			.data		=	&ipv6_devconf.proxy_ndp,
4290 			.maxlen		=	sizeof(int),
4291 			.mode		=	0644,
4292 			.proc_handler	=	proc_dointvec,
4293 		},
4294 		{
4295 			.procname	=	"accept_source_route",
4296 			.data		=	&ipv6_devconf.accept_source_route,
4297 			.maxlen		=	sizeof(int),
4298 			.mode		=	0644,
4299 			.proc_handler	=	proc_dointvec,
4300 		},
4301 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4302 		{
4303 			.procname       =       "optimistic_dad",
4304 			.data           =       &ipv6_devconf.optimistic_dad,
4305 			.maxlen         =       sizeof(int),
4306 			.mode           =       0644,
4307 			.proc_handler   =       proc_dointvec,
4308 
4309 		},
4310 #endif
4311 #ifdef CONFIG_IPV6_MROUTE
4312 		{
4313 			.procname	=	"mc_forwarding",
4314 			.data		=	&ipv6_devconf.mc_forwarding,
4315 			.maxlen		=	sizeof(int),
4316 			.mode		=	0444,
4317 			.proc_handler	=	proc_dointvec,
4318 		},
4319 #endif
4320 		{
4321 			.procname	=	"disable_ipv6",
4322 			.data		=	&ipv6_devconf.disable_ipv6,
4323 			.maxlen		=	sizeof(int),
4324 			.mode		=	0644,
4325 			.proc_handler	=	addrconf_sysctl_disable,
4326 		},
4327 		{
4328 			.procname	=	"accept_dad",
4329 			.data		=	&ipv6_devconf.accept_dad,
4330 			.maxlen		=	sizeof(int),
4331 			.mode		=	0644,
4332 			.proc_handler	=	proc_dointvec,
4333 		},
4334 		{
4335 			.procname       = "force_tllao",
4336 			.data           = &ipv6_devconf.force_tllao,
4337 			.maxlen         = sizeof(int),
4338 			.mode           = 0644,
4339 			.proc_handler   = proc_dointvec
4340 		},
4341 		{
4342 			/* sentinel */
4343 		}
4344 	},
4345 };
4346 
4347 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4348 		struct inet6_dev *idev, struct ipv6_devconf *p)
4349 {
4350 	int i;
4351 	struct addrconf_sysctl_table *t;
4352 
4353 #define ADDRCONF_CTL_PATH_DEV	3
4354 
4355 	struct ctl_path addrconf_ctl_path[] = {
4356 		{ .procname = "net", },
4357 		{ .procname = "ipv6", },
4358 		{ .procname = "conf", },
4359 		{ /* to be set */ },
4360 		{ },
4361 	};
4362 
4363 
4364 	t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4365 	if (t == NULL)
4366 		goto out;
4367 
4368 	for (i=0; t->addrconf_vars[i].data; i++) {
4369 		t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
4370 		t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4371 		t->addrconf_vars[i].extra2 = net;
4372 	}
4373 
4374 	/*
4375 	 * Make a copy of dev_name, because '.procname' is regarded as const
4376 	 * by sysctl and we wouldn't want anyone to change it under our feet
4377 	 * (see SIOCSIFNAME).
4378 	 */
4379 	t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4380 	if (!t->dev_name)
4381 		goto free;
4382 
4383 	addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
4384 
4385 	t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
4386 			t->addrconf_vars);
4387 	if (t->sysctl_header == NULL)
4388 		goto free_procname;
4389 
4390 	p->sysctl = t;
4391 	return 0;
4392 
4393 free_procname:
4394 	kfree(t->dev_name);
4395 free:
4396 	kfree(t);
4397 out:
4398 	return -ENOBUFS;
4399 }
4400 
4401 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4402 {
4403 	struct addrconf_sysctl_table *t;
4404 
4405 	if (p->sysctl == NULL)
4406 		return;
4407 
4408 	t = p->sysctl;
4409 	p->sysctl = NULL;
4410 	unregister_sysctl_table(t->sysctl_header);
4411 	kfree(t->dev_name);
4412 	kfree(t);
4413 }
4414 
4415 static void addrconf_sysctl_register(struct inet6_dev *idev)
4416 {
4417 	neigh_sysctl_register(idev->dev, idev->nd_parms, NET_IPV6,
4418 			      NET_IPV6_NEIGH, "ipv6",
4419 			      &ndisc_ifinfo_sysctl_change);
4420 	__addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
4421 					idev, &idev->cnf);
4422 }
4423 
4424 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
4425 {
4426 	__addrconf_sysctl_unregister(&idev->cnf);
4427 	neigh_sysctl_unregister(idev->nd_parms);
4428 }
4429 
4430 
4431 #endif
4432 
4433 static int addrconf_init_net(struct net *net)
4434 {
4435 	int err;
4436 	struct ipv6_devconf *all, *dflt;
4437 
4438 	err = -ENOMEM;
4439 	all = &ipv6_devconf;
4440 	dflt = &ipv6_devconf_dflt;
4441 
4442 	if (!net_eq(net, &init_net)) {
4443 		all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4444 		if (all == NULL)
4445 			goto err_alloc_all;
4446 
4447 		dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4448 		if (dflt == NULL)
4449 			goto err_alloc_dflt;
4450 	} else {
4451 		/* these will be inherited by all namespaces */
4452 		dflt->autoconf = ipv6_defaults.autoconf;
4453 		dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
4454 	}
4455 
4456 	net->ipv6.devconf_all = all;
4457 	net->ipv6.devconf_dflt = dflt;
4458 
4459 #ifdef CONFIG_SYSCTL
4460 	err = __addrconf_sysctl_register(net, "all", NULL, all);
4461 	if (err < 0)
4462 		goto err_reg_all;
4463 
4464 	err = __addrconf_sysctl_register(net, "default", NULL, dflt);
4465 	if (err < 0)
4466 		goto err_reg_dflt;
4467 #endif
4468 	return 0;
4469 
4470 #ifdef CONFIG_SYSCTL
4471 err_reg_dflt:
4472 	__addrconf_sysctl_unregister(all);
4473 err_reg_all:
4474 	kfree(dflt);
4475 #endif
4476 err_alloc_dflt:
4477 	kfree(all);
4478 err_alloc_all:
4479 	return err;
4480 }
4481 
4482 static void addrconf_exit_net(struct net *net)
4483 {
4484 #ifdef CONFIG_SYSCTL
4485 	__addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4486 	__addrconf_sysctl_unregister(net->ipv6.devconf_all);
4487 #endif
4488 	if (!net_eq(net, &init_net)) {
4489 		kfree(net->ipv6.devconf_dflt);
4490 		kfree(net->ipv6.devconf_all);
4491 	}
4492 }
4493 
4494 static struct pernet_operations addrconf_ops = {
4495 	.init = addrconf_init_net,
4496 	.exit = addrconf_exit_net,
4497 };
4498 
4499 /*
4500  *      Device notifier
4501  */
4502 
4503 int register_inet6addr_notifier(struct notifier_block *nb)
4504 {
4505 	return atomic_notifier_chain_register(&inet6addr_chain, nb);
4506 }
4507 
4508 EXPORT_SYMBOL(register_inet6addr_notifier);
4509 
4510 int unregister_inet6addr_notifier(struct notifier_block *nb)
4511 {
4512 	return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
4513 }
4514 
4515 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4516 
4517 /*
4518  *	Init / cleanup code
4519  */
4520 
4521 int __init addrconf_init(void)
4522 {
4523 	int err;
4524 
4525 	if ((err = ipv6_addr_label_init()) < 0) {
4526 		printk(KERN_CRIT "IPv6 Addrconf: cannot initialize default policy table: %d.\n",
4527 			err);
4528 		return err;
4529 	}
4530 
4531 	register_pernet_subsys(&addrconf_ops);
4532 
4533 	/* The addrconf netdev notifier requires that loopback_dev
4534 	 * has it's ipv6 private information allocated and setup
4535 	 * before it can bring up and give link-local addresses
4536 	 * to other devices which are up.
4537 	 *
4538 	 * Unfortunately, loopback_dev is not necessarily the first
4539 	 * entry in the global dev_base list of net devices.  In fact,
4540 	 * it is likely to be the very last entry on that list.
4541 	 * So this causes the notifier registry below to try and
4542 	 * give link-local addresses to all devices besides loopback_dev
4543 	 * first, then loopback_dev, which cases all the non-loopback_dev
4544 	 * devices to fail to get a link-local address.
4545 	 *
4546 	 * So, as a temporary fix, allocate the ipv6 structure for
4547 	 * loopback_dev first by hand.
4548 	 * Longer term, all of the dependencies ipv6 has upon the loopback
4549 	 * device and it being up should be removed.
4550 	 */
4551 	rtnl_lock();
4552 	if (!ipv6_add_dev(init_net.loopback_dev))
4553 		err = -ENOMEM;
4554 	rtnl_unlock();
4555 	if (err)
4556 		goto errlo;
4557 
4558 	register_netdevice_notifier(&ipv6_dev_notf);
4559 
4560 	addrconf_verify(0);
4561 
4562 	err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4563 	if (err < 0)
4564 		goto errout;
4565 
4566 	/* Only the first call to __rtnl_register can fail */
4567 	__rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4568 	__rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4569 	__rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4570 	__rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4571 	__rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4572 
4573 	ipv6_addr_label_rtnl_register();
4574 
4575 	return 0;
4576 errout:
4577 	unregister_netdevice_notifier(&ipv6_dev_notf);
4578 errlo:
4579 	unregister_pernet_subsys(&addrconf_ops);
4580 
4581 	return err;
4582 }
4583 
4584 void addrconf_cleanup(void)
4585 {
4586 	struct inet6_ifaddr *ifa;
4587 	struct net_device *dev;
4588 	int i;
4589 
4590 	unregister_netdevice_notifier(&ipv6_dev_notf);
4591 	unregister_pernet_subsys(&addrconf_ops);
4592 
4593 	rtnl_lock();
4594 
4595 	/* clean dev list */
4596 	for_each_netdev(&init_net, dev) {
4597 		if (__in6_dev_get(dev) == NULL)
4598 			continue;
4599 		addrconf_ifdown(dev, 1);
4600 	}
4601 	addrconf_ifdown(init_net.loopback_dev, 2);
4602 
4603 	/*
4604 	 *	Check hash table.
4605 	 */
4606 	write_lock_bh(&addrconf_hash_lock);
4607 	for (i=0; i < IN6_ADDR_HSIZE; i++) {
4608 		for (ifa=inet6_addr_lst[i]; ifa; ) {
4609 			struct inet6_ifaddr *bifa;
4610 
4611 			bifa = ifa;
4612 			ifa = ifa->lst_next;
4613 			printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
4614 			/* Do not free it; something is wrong.
4615 			   Now we can investigate it with debugger.
4616 			 */
4617 		}
4618 	}
4619 	write_unlock_bh(&addrconf_hash_lock);
4620 
4621 	del_timer(&addr_chk_timer);
4622 	rtnl_unlock();
4623 }
4624