xref: /openbmc/linux/net/ipv6/addrconf.c (revision 643d1f7f)
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  *	$Id: addrconf.c,v 1.69 2001/10/31 21:55:54 davem Exp $
10  *
11  *	This program is free software; you can redistribute it and/or
12  *      modify it under the terms of the GNU General Public License
13  *      as published by the Free Software Foundation; either version
14  *      2 of the License, or (at your option) any later version.
15  */
16 
17 /*
18  *	Changes:
19  *
20  *	Janos Farkas			:	delete timer on ifdown
21  *	<chexum@bankinf.banki.hu>
22  *	Andi Kleen			:	kill double kfree on module
23  *						unload.
24  *	Maciej W. Rozycki		:	FDDI support
25  *	sekiya@USAGI			:	Don't send too many RS
26  *						packets.
27  *	yoshfuji@USAGI			:       Fixed interval between DAD
28  *						packets.
29  *	YOSHIFUJI Hideaki @USAGI	:	improved accuracy of
30  *						address validation timer.
31  *	YOSHIFUJI Hideaki @USAGI	:	Privacy Extensions (RFC3041)
32  *						support.
33  *	Yuji SEKIYA @USAGI		:	Don't assign a same IPv6
34  *						address on a same interface.
35  *	YOSHIFUJI Hideaki @USAGI	:	ARCnet support
36  *	YOSHIFUJI Hideaki @USAGI	:	convert /proc/net/if_inet6 to
37  *						seq_file.
38  *	YOSHIFUJI Hideaki @USAGI	:	improved source address
39  *						selection; consider scope,
40  *						status etc.
41  */
42 
43 #include <linux/errno.h>
44 #include <linux/types.h>
45 #include <linux/socket.h>
46 #include <linux/sockios.h>
47 #include <linux/net.h>
48 #include <linux/in6.h>
49 #include <linux/netdevice.h>
50 #include <linux/if_addr.h>
51 #include <linux/if_arp.h>
52 #include <linux/if_arcnet.h>
53 #include <linux/if_infiniband.h>
54 #include <linux/route.h>
55 #include <linux/inetdevice.h>
56 #include <linux/init.h>
57 #ifdef CONFIG_SYSCTL
58 #include <linux/sysctl.h>
59 #endif
60 #include <linux/capability.h>
61 #include <linux/delay.h>
62 #include <linux/notifier.h>
63 #include <linux/string.h>
64 
65 #include <net/net_namespace.h>
66 #include <net/sock.h>
67 #include <net/snmp.h>
68 
69 #include <net/ipv6.h>
70 #include <net/protocol.h>
71 #include <net/ndisc.h>
72 #include <net/ip6_route.h>
73 #include <net/addrconf.h>
74 #include <net/tcp.h>
75 #include <net/ip.h>
76 #include <net/netlink.h>
77 #include <net/pkt_sched.h>
78 #include <linux/if_tunnel.h>
79 #include <linux/rtnetlink.h>
80 
81 #ifdef CONFIG_IPV6_PRIVACY
82 #include <linux/random.h>
83 #endif
84 
85 #include <asm/uaccess.h>
86 #include <asm/unaligned.h>
87 
88 #include <linux/proc_fs.h>
89 #include <linux/seq_file.h>
90 
91 /* Set to 3 to get tracing... */
92 #define ACONF_DEBUG 2
93 
94 #if ACONF_DEBUG >= 3
95 #define ADBG(x) printk x
96 #else
97 #define ADBG(x)
98 #endif
99 
100 #define	INFINITY_LIFE_TIME	0xFFFFFFFF
101 #define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b)))
102 
103 #ifdef CONFIG_SYSCTL
104 static void addrconf_sysctl_register(struct inet6_dev *idev);
105 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
106 #else
107 static inline void addrconf_sysctl_register(struct inet6_dev *idev)
108 {
109 }
110 
111 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
112 {
113 }
114 #endif
115 
116 #ifdef CONFIG_IPV6_PRIVACY
117 static int __ipv6_regen_rndid(struct inet6_dev *idev);
118 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
119 static void ipv6_regen_rndid(unsigned long data);
120 
121 static int desync_factor = MAX_DESYNC_FACTOR * HZ;
122 #endif
123 
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 int addrconf_ifdown(struct net_device *dev, int how);
141 
142 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
143 static void addrconf_dad_timer(unsigned long data);
144 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
145 static void addrconf_dad_run(struct inet6_dev *idev);
146 static void addrconf_rs_timer(unsigned long data);
147 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
148 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
149 
150 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
151 				struct prefix_info *pinfo);
152 static int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
153 			      struct net_device *dev);
154 
155 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
156 
157 struct ipv6_devconf ipv6_devconf __read_mostly = {
158 	.forwarding		= 0,
159 	.hop_limit		= IPV6_DEFAULT_HOPLIMIT,
160 	.mtu6			= IPV6_MIN_MTU,
161 	.accept_ra		= 1,
162 	.accept_redirects	= 1,
163 	.autoconf		= 1,
164 	.force_mld_version	= 0,
165 	.dad_transmits		= 1,
166 	.rtr_solicits		= MAX_RTR_SOLICITATIONS,
167 	.rtr_solicit_interval	= RTR_SOLICITATION_INTERVAL,
168 	.rtr_solicit_delay	= MAX_RTR_SOLICITATION_DELAY,
169 #ifdef CONFIG_IPV6_PRIVACY
170 	.use_tempaddr 		= 0,
171 	.temp_valid_lft		= TEMP_VALID_LIFETIME,
172 	.temp_prefered_lft	= TEMP_PREFERRED_LIFETIME,
173 	.regen_max_retry	= REGEN_MAX_RETRY,
174 	.max_desync_factor	= MAX_DESYNC_FACTOR,
175 #endif
176 	.max_addresses		= IPV6_MAX_ADDRESSES,
177 	.accept_ra_defrtr	= 1,
178 	.accept_ra_pinfo	= 1,
179 #ifdef CONFIG_IPV6_ROUTER_PREF
180 	.accept_ra_rtr_pref	= 1,
181 	.rtr_probe_interval	= 60 * HZ,
182 #ifdef CONFIG_IPV6_ROUTE_INFO
183 	.accept_ra_rt_info_max_plen = 0,
184 #endif
185 #endif
186 	.proxy_ndp		= 0,
187 	.accept_source_route	= 0,	/* we do not accept RH0 by default. */
188 };
189 
190 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
191 	.forwarding		= 0,
192 	.hop_limit		= IPV6_DEFAULT_HOPLIMIT,
193 	.mtu6			= IPV6_MIN_MTU,
194 	.accept_ra		= 1,
195 	.accept_redirects	= 1,
196 	.autoconf		= 1,
197 	.dad_transmits		= 1,
198 	.rtr_solicits		= MAX_RTR_SOLICITATIONS,
199 	.rtr_solicit_interval	= RTR_SOLICITATION_INTERVAL,
200 	.rtr_solicit_delay	= MAX_RTR_SOLICITATION_DELAY,
201 #ifdef CONFIG_IPV6_PRIVACY
202 	.use_tempaddr		= 0,
203 	.temp_valid_lft		= TEMP_VALID_LIFETIME,
204 	.temp_prefered_lft	= TEMP_PREFERRED_LIFETIME,
205 	.regen_max_retry	= REGEN_MAX_RETRY,
206 	.max_desync_factor	= MAX_DESYNC_FACTOR,
207 #endif
208 	.max_addresses		= IPV6_MAX_ADDRESSES,
209 	.accept_ra_defrtr	= 1,
210 	.accept_ra_pinfo	= 1,
211 #ifdef CONFIG_IPV6_ROUTER_PREF
212 	.accept_ra_rtr_pref	= 1,
213 	.rtr_probe_interval	= 60 * HZ,
214 #ifdef CONFIG_IPV6_ROUTE_INFO
215 	.accept_ra_rt_info_max_plen = 0,
216 #endif
217 #endif
218 	.proxy_ndp		= 0,
219 	.accept_source_route	= 0,	/* we do not accept RH0 by default. */
220 };
221 
222 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
223 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
224 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
225 
226 /* Check if a valid qdisc is available */
227 static inline int addrconf_qdisc_ok(struct net_device *dev)
228 {
229 	return (dev->qdisc != &noop_qdisc);
230 }
231 
232 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
233 {
234 	if (del_timer(&ifp->timer))
235 		__in6_ifa_put(ifp);
236 }
237 
238 enum addrconf_timer_t
239 {
240 	AC_NONE,
241 	AC_DAD,
242 	AC_RS,
243 };
244 
245 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
246 			       enum addrconf_timer_t what,
247 			       unsigned long when)
248 {
249 	if (!del_timer(&ifp->timer))
250 		in6_ifa_hold(ifp);
251 
252 	switch (what) {
253 	case AC_DAD:
254 		ifp->timer.function = addrconf_dad_timer;
255 		break;
256 	case AC_RS:
257 		ifp->timer.function = addrconf_rs_timer;
258 		break;
259 	default:;
260 	}
261 	ifp->timer.expires = jiffies + when;
262 	add_timer(&ifp->timer);
263 }
264 
265 static int snmp6_alloc_dev(struct inet6_dev *idev)
266 {
267 	if (snmp_mib_init((void **)idev->stats.ipv6,
268 			  sizeof(struct ipstats_mib)) < 0)
269 		goto err_ip;
270 	if (snmp_mib_init((void **)idev->stats.icmpv6,
271 			  sizeof(struct icmpv6_mib)) < 0)
272 		goto err_icmp;
273 	if (snmp_mib_init((void **)idev->stats.icmpv6msg,
274 			  sizeof(struct icmpv6msg_mib)) < 0)
275 		goto err_icmpmsg;
276 
277 	return 0;
278 
279 err_icmpmsg:
280 	snmp_mib_free((void **)idev->stats.icmpv6);
281 err_icmp:
282 	snmp_mib_free((void **)idev->stats.ipv6);
283 err_ip:
284 	return -ENOMEM;
285 }
286 
287 static void snmp6_free_dev(struct inet6_dev *idev)
288 {
289 	snmp_mib_free((void **)idev->stats.icmpv6msg);
290 	snmp_mib_free((void **)idev->stats.icmpv6);
291 	snmp_mib_free((void **)idev->stats.ipv6);
292 }
293 
294 /* Nobody refers to this device, we may destroy it. */
295 
296 static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
297 {
298 	struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
299 	kfree(idev);
300 }
301 
302 void in6_dev_finish_destroy(struct inet6_dev *idev)
303 {
304 	struct net_device *dev = idev->dev;
305 	BUG_TRAP(idev->addr_list==NULL);
306 	BUG_TRAP(idev->mc_list==NULL);
307 #ifdef NET_REFCNT_DEBUG
308 	printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
309 #endif
310 	dev_put(dev);
311 	if (!idev->dead) {
312 		printk("Freeing alive inet6 device %p\n", idev);
313 		return;
314 	}
315 	snmp6_free_dev(idev);
316 	call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
317 }
318 
319 EXPORT_SYMBOL(in6_dev_finish_destroy);
320 
321 static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
322 {
323 	struct inet6_dev *ndev;
324 	struct in6_addr maddr;
325 
326 	ASSERT_RTNL();
327 
328 	if (dev->mtu < IPV6_MIN_MTU)
329 		return NULL;
330 
331 	ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
332 
333 	if (ndev == NULL)
334 		return NULL;
335 
336 	rwlock_init(&ndev->lock);
337 	ndev->dev = dev;
338 	memcpy(&ndev->cnf, dev->nd_net->ipv6.devconf_dflt, sizeof(ndev->cnf));
339 	ndev->cnf.mtu6 = dev->mtu;
340 	ndev->cnf.sysctl = NULL;
341 	ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
342 	if (ndev->nd_parms == NULL) {
343 		kfree(ndev);
344 		return NULL;
345 	}
346 	/* We refer to the device */
347 	dev_hold(dev);
348 
349 	if (snmp6_alloc_dev(ndev) < 0) {
350 		ADBG((KERN_WARNING
351 			"%s(): cannot allocate memory for statistics; dev=%s.\n",
352 			__FUNCTION__, dev->name));
353 		neigh_parms_release(&nd_tbl, ndev->nd_parms);
354 		ndev->dead = 1;
355 		in6_dev_finish_destroy(ndev);
356 		return NULL;
357 	}
358 
359 	if (snmp6_register_dev(ndev) < 0) {
360 		ADBG((KERN_WARNING
361 			"%s(): cannot create /proc/net/dev_snmp6/%s\n",
362 			__FUNCTION__, dev->name));
363 		neigh_parms_release(&nd_tbl, ndev->nd_parms);
364 		ndev->dead = 1;
365 		in6_dev_finish_destroy(ndev);
366 		return NULL;
367 	}
368 
369 	/* One reference from device.  We must do this before
370 	 * we invoke __ipv6_regen_rndid().
371 	 */
372 	in6_dev_hold(ndev);
373 
374 #ifdef CONFIG_IPV6_PRIVACY
375 	setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
376 	if ((dev->flags&IFF_LOOPBACK) ||
377 	    dev->type == ARPHRD_TUNNEL ||
378 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
379 	    dev->type == ARPHRD_SIT ||
380 #endif
381 	    dev->type == ARPHRD_NONE) {
382 		printk(KERN_INFO
383 		       "%s: Disabled Privacy Extensions\n",
384 		       dev->name);
385 		ndev->cnf.use_tempaddr = -1;
386 
387 		if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
388 			printk(KERN_INFO
389 			       "%s: Disabled Multicast RS\n",
390 			       dev->name);
391 			ndev->cnf.rtr_solicits = 0;
392 		}
393 	} else {
394 		in6_dev_hold(ndev);
395 		ipv6_regen_rndid((unsigned long) ndev);
396 	}
397 #endif
398 
399 	if (netif_running(dev) && addrconf_qdisc_ok(dev))
400 		ndev->if_flags |= IF_READY;
401 
402 	ipv6_mc_init_dev(ndev);
403 	ndev->tstamp = jiffies;
404 	addrconf_sysctl_register(ndev);
405 	/* protected by rtnl_lock */
406 	rcu_assign_pointer(dev->ip6_ptr, ndev);
407 
408 	/* Join all-node multicast group */
409 	ipv6_addr_all_nodes(&maddr);
410 	ipv6_dev_mc_inc(dev, &maddr);
411 
412 	return ndev;
413 }
414 
415 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
416 {
417 	struct inet6_dev *idev;
418 
419 	ASSERT_RTNL();
420 
421 	if ((idev = __in6_dev_get(dev)) == NULL) {
422 		if ((idev = ipv6_add_dev(dev)) == NULL)
423 			return NULL;
424 	}
425 
426 	if (dev->flags&IFF_UP)
427 		ipv6_mc_up(idev);
428 	return idev;
429 }
430 
431 #ifdef CONFIG_SYSCTL
432 static void dev_forward_change(struct inet6_dev *idev)
433 {
434 	struct net_device *dev;
435 	struct inet6_ifaddr *ifa;
436 	struct in6_addr addr;
437 
438 	if (!idev)
439 		return;
440 	dev = idev->dev;
441 	if (dev && (dev->flags & IFF_MULTICAST)) {
442 		ipv6_addr_all_routers(&addr);
443 
444 		if (idev->cnf.forwarding)
445 			ipv6_dev_mc_inc(dev, &addr);
446 		else
447 			ipv6_dev_mc_dec(dev, &addr);
448 	}
449 	for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
450 		if (ifa->flags&IFA_F_TENTATIVE)
451 			continue;
452 		if (idev->cnf.forwarding)
453 			addrconf_join_anycast(ifa);
454 		else
455 			addrconf_leave_anycast(ifa);
456 	}
457 }
458 
459 
460 static void addrconf_forward_change(struct net *net, __s32 newf)
461 {
462 	struct net_device *dev;
463 	struct inet6_dev *idev;
464 
465 	read_lock(&dev_base_lock);
466 	for_each_netdev(net, dev) {
467 		rcu_read_lock();
468 		idev = __in6_dev_get(dev);
469 		if (idev) {
470 			int changed = (!idev->cnf.forwarding) ^ (!newf);
471 			idev->cnf.forwarding = newf;
472 			if (changed)
473 				dev_forward_change(idev);
474 		}
475 		rcu_read_unlock();
476 	}
477 	read_unlock(&dev_base_lock);
478 }
479 
480 static void addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old)
481 {
482 	struct net *net;
483 
484 	net = (struct net *)table->extra2;
485 	if (p == &net->ipv6.devconf_dflt->forwarding)
486 		return;
487 
488 	if (p == &net->ipv6.devconf_all->forwarding) {
489 		__s32 newf = net->ipv6.devconf_all->forwarding;
490 		net->ipv6.devconf_dflt->forwarding = newf;
491 		addrconf_forward_change(net, newf);
492 	} else if ((!*p) ^ (!old))
493 		dev_forward_change((struct inet6_dev *)table->extra1);
494 
495 	if (*p)
496 		rt6_purge_dflt_routers();
497 }
498 #endif
499 
500 /* Nobody refers to this ifaddr, destroy it */
501 
502 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
503 {
504 	BUG_TRAP(ifp->if_next==NULL);
505 	BUG_TRAP(ifp->lst_next==NULL);
506 #ifdef NET_REFCNT_DEBUG
507 	printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
508 #endif
509 
510 	in6_dev_put(ifp->idev);
511 
512 	if (del_timer(&ifp->timer))
513 		printk("Timer is still running, when freeing ifa=%p\n", ifp);
514 
515 	if (!ifp->dead) {
516 		printk("Freeing alive inet6 address %p\n", ifp);
517 		return;
518 	}
519 	dst_release(&ifp->rt->u.dst);
520 
521 	kfree(ifp);
522 }
523 
524 static void
525 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
526 {
527 	struct inet6_ifaddr *ifa, **ifap;
528 	int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
529 
530 	/*
531 	 * Each device address list is sorted in order of scope -
532 	 * global before linklocal.
533 	 */
534 	for (ifap = &idev->addr_list; (ifa = *ifap) != NULL;
535 	     ifap = &ifa->if_next) {
536 		if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
537 			break;
538 	}
539 
540 	ifp->if_next = *ifap;
541 	*ifap = ifp;
542 }
543 
544 /* On success it returns ifp with increased reference count */
545 
546 static struct inet6_ifaddr *
547 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
548 	      int scope, u32 flags)
549 {
550 	struct inet6_ifaddr *ifa = NULL;
551 	struct rt6_info *rt;
552 	int hash;
553 	int err = 0;
554 
555 	rcu_read_lock_bh();
556 	if (idev->dead) {
557 		err = -ENODEV;			/*XXX*/
558 		goto out2;
559 	}
560 
561 	write_lock(&addrconf_hash_lock);
562 
563 	/* Ignore adding duplicate addresses on an interface */
564 	if (ipv6_chk_same_addr(&init_net, addr, idev->dev)) {
565 		ADBG(("ipv6_add_addr: already assigned\n"));
566 		err = -EEXIST;
567 		goto out;
568 	}
569 
570 	ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
571 
572 	if (ifa == NULL) {
573 		ADBG(("ipv6_add_addr: malloc failed\n"));
574 		err = -ENOBUFS;
575 		goto out;
576 	}
577 
578 	rt = addrconf_dst_alloc(idev, addr, 0);
579 	if (IS_ERR(rt)) {
580 		err = PTR_ERR(rt);
581 		goto out;
582 	}
583 
584 	ipv6_addr_copy(&ifa->addr, addr);
585 
586 	spin_lock_init(&ifa->lock);
587 	init_timer(&ifa->timer);
588 	ifa->timer.data = (unsigned long) ifa;
589 	ifa->scope = scope;
590 	ifa->prefix_len = pfxlen;
591 	ifa->flags = flags | IFA_F_TENTATIVE;
592 	ifa->cstamp = ifa->tstamp = jiffies;
593 
594 	ifa->rt = rt;
595 
596 	/*
597 	 * part one of RFC 4429, section 3.3
598 	 * We should not configure an address as
599 	 * optimistic if we do not yet know the link
600 	 * layer address of our nexhop router
601 	 */
602 
603 	if (rt->rt6i_nexthop == NULL)
604 		ifa->flags &= ~IFA_F_OPTIMISTIC;
605 
606 	ifa->idev = idev;
607 	in6_dev_hold(idev);
608 	/* For caller */
609 	in6_ifa_hold(ifa);
610 
611 	/* Add to big hash table */
612 	hash = ipv6_addr_hash(addr);
613 
614 	ifa->lst_next = inet6_addr_lst[hash];
615 	inet6_addr_lst[hash] = ifa;
616 	in6_ifa_hold(ifa);
617 	write_unlock(&addrconf_hash_lock);
618 
619 	write_lock(&idev->lock);
620 	/* Add to inet6_dev unicast addr list. */
621 	ipv6_link_dev_addr(idev, ifa);
622 
623 #ifdef CONFIG_IPV6_PRIVACY
624 	if (ifa->flags&IFA_F_TEMPORARY) {
625 		ifa->tmp_next = idev->tempaddr_list;
626 		idev->tempaddr_list = ifa;
627 		in6_ifa_hold(ifa);
628 	}
629 #endif
630 
631 	in6_ifa_hold(ifa);
632 	write_unlock(&idev->lock);
633 out2:
634 	rcu_read_unlock_bh();
635 
636 	if (likely(err == 0))
637 		atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
638 	else {
639 		kfree(ifa);
640 		ifa = ERR_PTR(err);
641 	}
642 
643 	return ifa;
644 out:
645 	write_unlock(&addrconf_hash_lock);
646 	goto out2;
647 }
648 
649 /* This function wants to get referenced ifp and releases it before return */
650 
651 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
652 {
653 	struct inet6_ifaddr *ifa, **ifap;
654 	struct inet6_dev *idev = ifp->idev;
655 	int hash;
656 	int deleted = 0, onlink = 0;
657 	unsigned long expires = jiffies;
658 
659 	hash = ipv6_addr_hash(&ifp->addr);
660 
661 	ifp->dead = 1;
662 
663 	write_lock_bh(&addrconf_hash_lock);
664 	for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
665 	     ifap = &ifa->lst_next) {
666 		if (ifa == ifp) {
667 			*ifap = ifa->lst_next;
668 			__in6_ifa_put(ifp);
669 			ifa->lst_next = NULL;
670 			break;
671 		}
672 	}
673 	write_unlock_bh(&addrconf_hash_lock);
674 
675 	write_lock_bh(&idev->lock);
676 #ifdef CONFIG_IPV6_PRIVACY
677 	if (ifp->flags&IFA_F_TEMPORARY) {
678 		for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
679 		     ifap = &ifa->tmp_next) {
680 			if (ifa == ifp) {
681 				*ifap = ifa->tmp_next;
682 				if (ifp->ifpub) {
683 					in6_ifa_put(ifp->ifpub);
684 					ifp->ifpub = NULL;
685 				}
686 				__in6_ifa_put(ifp);
687 				ifa->tmp_next = NULL;
688 				break;
689 			}
690 		}
691 	}
692 #endif
693 
694 	for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
695 		if (ifa == ifp) {
696 			*ifap = ifa->if_next;
697 			__in6_ifa_put(ifp);
698 			ifa->if_next = NULL;
699 			if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
700 				break;
701 			deleted = 1;
702 			continue;
703 		} else if (ifp->flags & IFA_F_PERMANENT) {
704 			if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
705 					      ifp->prefix_len)) {
706 				if (ifa->flags & IFA_F_PERMANENT) {
707 					onlink = 1;
708 					if (deleted)
709 						break;
710 				} else {
711 					unsigned long lifetime;
712 
713 					if (!onlink)
714 						onlink = -1;
715 
716 					spin_lock(&ifa->lock);
717 					lifetime = min_t(unsigned long,
718 							 ifa->valid_lft, 0x7fffffffUL/HZ);
719 					if (time_before(expires,
720 							ifa->tstamp + lifetime * HZ))
721 						expires = ifa->tstamp + lifetime * HZ;
722 					spin_unlock(&ifa->lock);
723 				}
724 			}
725 		}
726 		ifap = &ifa->if_next;
727 	}
728 	write_unlock_bh(&idev->lock);
729 
730 	ipv6_ifa_notify(RTM_DELADDR, ifp);
731 
732 	atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
733 
734 	addrconf_del_timer(ifp);
735 
736 	/*
737 	 * Purge or update corresponding prefix
738 	 *
739 	 * 1) we don't purge prefix here if address was not permanent.
740 	 *    prefix is managed by its own lifetime.
741 	 * 2) if there're no addresses, delete prefix.
742 	 * 3) if there're still other permanent address(es),
743 	 *    corresponding prefix is still permanent.
744 	 * 4) otherwise, update prefix lifetime to the
745 	 *    longest valid lifetime among the corresponding
746 	 *    addresses on the device.
747 	 *    Note: subsequent RA will update lifetime.
748 	 *
749 	 * --yoshfuji
750 	 */
751 	if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
752 		struct in6_addr prefix;
753 		struct rt6_info *rt;
754 
755 		ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
756 		rt = rt6_lookup(&prefix, NULL, ifp->idev->dev->ifindex, 1);
757 
758 		if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
759 			if (onlink == 0) {
760 				ip6_del_rt(rt);
761 				rt = NULL;
762 			} else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
763 				rt->rt6i_expires = expires;
764 				rt->rt6i_flags |= RTF_EXPIRES;
765 			}
766 		}
767 		dst_release(&rt->u.dst);
768 	}
769 
770 	in6_ifa_put(ifp);
771 }
772 
773 #ifdef CONFIG_IPV6_PRIVACY
774 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
775 {
776 	struct inet6_dev *idev = ifp->idev;
777 	struct in6_addr addr, *tmpaddr;
778 	unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
779 	int tmp_plen;
780 	int ret = 0;
781 	int max_addresses;
782 	u32 addr_flags;
783 
784 	write_lock(&idev->lock);
785 	if (ift) {
786 		spin_lock_bh(&ift->lock);
787 		memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
788 		spin_unlock_bh(&ift->lock);
789 		tmpaddr = &addr;
790 	} else {
791 		tmpaddr = NULL;
792 	}
793 retry:
794 	in6_dev_hold(idev);
795 	if (idev->cnf.use_tempaddr <= 0) {
796 		write_unlock(&idev->lock);
797 		printk(KERN_INFO
798 			"ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
799 		in6_dev_put(idev);
800 		ret = -1;
801 		goto out;
802 	}
803 	spin_lock_bh(&ifp->lock);
804 	if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
805 		idev->cnf.use_tempaddr = -1;	/*XXX*/
806 		spin_unlock_bh(&ifp->lock);
807 		write_unlock(&idev->lock);
808 		printk(KERN_WARNING
809 			"ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
810 		in6_dev_put(idev);
811 		ret = -1;
812 		goto out;
813 	}
814 	in6_ifa_hold(ifp);
815 	memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
816 	if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
817 		spin_unlock_bh(&ifp->lock);
818 		write_unlock(&idev->lock);
819 		printk(KERN_WARNING
820 			"ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
821 		in6_ifa_put(ifp);
822 		in6_dev_put(idev);
823 		ret = -1;
824 		goto out;
825 	}
826 	memcpy(&addr.s6_addr[8], idev->rndid, 8);
827 	tmp_valid_lft = min_t(__u32,
828 			      ifp->valid_lft,
829 			      idev->cnf.temp_valid_lft);
830 	tmp_prefered_lft = min_t(__u32,
831 				 ifp->prefered_lft,
832 				 idev->cnf.temp_prefered_lft - desync_factor / HZ);
833 	tmp_plen = ifp->prefix_len;
834 	max_addresses = idev->cnf.max_addresses;
835 	tmp_cstamp = ifp->cstamp;
836 	tmp_tstamp = ifp->tstamp;
837 	spin_unlock_bh(&ifp->lock);
838 
839 	write_unlock(&idev->lock);
840 
841 	addr_flags = IFA_F_TEMPORARY;
842 	/* set in addrconf_prefix_rcv() */
843 	if (ifp->flags & IFA_F_OPTIMISTIC)
844 		addr_flags |= IFA_F_OPTIMISTIC;
845 
846 	ift = !max_addresses ||
847 	      ipv6_count_addresses(idev) < max_addresses ?
848 		ipv6_add_addr(idev, &addr, tmp_plen,
849 			      ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
850 			      addr_flags) : NULL;
851 	if (!ift || IS_ERR(ift)) {
852 		in6_ifa_put(ifp);
853 		in6_dev_put(idev);
854 		printk(KERN_INFO
855 			"ipv6_create_tempaddr(): retry temporary address regeneration.\n");
856 		tmpaddr = &addr;
857 		write_lock(&idev->lock);
858 		goto retry;
859 	}
860 
861 	spin_lock_bh(&ift->lock);
862 	ift->ifpub = ifp;
863 	ift->valid_lft = tmp_valid_lft;
864 	ift->prefered_lft = tmp_prefered_lft;
865 	ift->cstamp = tmp_cstamp;
866 	ift->tstamp = tmp_tstamp;
867 	spin_unlock_bh(&ift->lock);
868 
869 	addrconf_dad_start(ift, 0);
870 	in6_ifa_put(ift);
871 	in6_dev_put(idev);
872 out:
873 	return ret;
874 }
875 #endif
876 
877 /*
878  *	Choose an appropriate source address (RFC3484)
879  */
880 struct ipv6_saddr_score {
881 	int		addr_type;
882 	unsigned int	attrs;
883 	int		matchlen;
884 	int		scope;
885 	unsigned int	rule;
886 };
887 
888 #define IPV6_SADDR_SCORE_LOCAL		0x0001
889 #define IPV6_SADDR_SCORE_PREFERRED	0x0004
890 #define IPV6_SADDR_SCORE_HOA		0x0008
891 #define IPV6_SADDR_SCORE_OIF		0x0010
892 #define IPV6_SADDR_SCORE_LABEL		0x0020
893 #define IPV6_SADDR_SCORE_PRIVACY	0x0040
894 
895 static inline int ipv6_saddr_preferred(int type)
896 {
897 	if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
898 		    IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
899 		return 1;
900 	return 0;
901 }
902 
903 int ipv6_dev_get_saddr(struct net_device *daddr_dev,
904 		       struct in6_addr *daddr, struct in6_addr *saddr)
905 {
906 	struct ipv6_saddr_score hiscore;
907 	struct inet6_ifaddr *ifa_result = NULL;
908 	int daddr_type = __ipv6_addr_type(daddr);
909 	int daddr_scope = __ipv6_addr_src_scope(daddr_type);
910 	int daddr_ifindex = daddr_dev ? daddr_dev->ifindex : 0;
911 	u32 daddr_label = ipv6_addr_label(daddr, daddr_type, daddr_ifindex);
912 	struct net_device *dev;
913 
914 	memset(&hiscore, 0, sizeof(hiscore));
915 
916 	read_lock(&dev_base_lock);
917 	rcu_read_lock();
918 
919 	for_each_netdev(&init_net, dev) {
920 		struct inet6_dev *idev;
921 		struct inet6_ifaddr *ifa;
922 
923 		/* Rule 0: Candidate Source Address (section 4)
924 		 *  - multicast and link-local destination address,
925 		 *    the set of candidate source address MUST only
926 		 *    include addresses assigned to interfaces
927 		 *    belonging to the same link as the outgoing
928 		 *    interface.
929 		 * (- For site-local destination addresses, the
930 		 *    set of candidate source addresses MUST only
931 		 *    include addresses assigned to interfaces
932 		 *    belonging to the same site as the outgoing
933 		 *    interface.)
934 		 */
935 		if ((daddr_type & IPV6_ADDR_MULTICAST ||
936 		     daddr_scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
937 		    daddr_dev && dev != daddr_dev)
938 			continue;
939 
940 		idev = __in6_dev_get(dev);
941 		if (!idev)
942 			continue;
943 
944 		read_lock_bh(&idev->lock);
945 		for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
946 			struct ipv6_saddr_score score;
947 
948 			score.addr_type = __ipv6_addr_type(&ifa->addr);
949 
950 			/* Rule 0:
951 			 * - Tentative Address (RFC2462 section 5.4)
952 			 *  - A tentative address is not considered
953 			 *    "assigned to an interface" in the traditional
954 			 *    sense, unless it is also flagged as optimistic.
955 			 * - Candidate Source Address (section 4)
956 			 *  - In any case, anycast addresses, multicast
957 			 *    addresses, and the unspecified address MUST
958 			 *    NOT be included in a candidate set.
959 			 */
960 			if ((ifa->flags & IFA_F_TENTATIVE) &&
961 			    (!(ifa->flags & IFA_F_OPTIMISTIC)))
962 				continue;
963 			if (unlikely(score.addr_type == IPV6_ADDR_ANY ||
964 				     score.addr_type & IPV6_ADDR_MULTICAST)) {
965 				LIMIT_NETDEBUG(KERN_DEBUG
966 					       "ADDRCONF: unspecified / multicast address "
967 					       "assigned as unicast address on %s",
968 					       dev->name);
969 				continue;
970 			}
971 
972 			score.attrs = 0;
973 			score.matchlen = 0;
974 			score.scope = 0;
975 			score.rule = 0;
976 
977 			if (ifa_result == NULL) {
978 				/* record it if the first available entry */
979 				goto record_it;
980 			}
981 
982 			/* Rule 1: Prefer same address */
983 			if (hiscore.rule < 1) {
984 				if (ipv6_addr_equal(&ifa_result->addr, daddr))
985 					hiscore.attrs |= IPV6_SADDR_SCORE_LOCAL;
986 				hiscore.rule++;
987 			}
988 			if (ipv6_addr_equal(&ifa->addr, daddr)) {
989 				score.attrs |= IPV6_SADDR_SCORE_LOCAL;
990 				if (!(hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)) {
991 					score.rule = 1;
992 					goto record_it;
993 				}
994 			} else {
995 				if (hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)
996 					continue;
997 			}
998 
999 			/* Rule 2: Prefer appropriate scope */
1000 			if (hiscore.rule < 2) {
1001 				hiscore.scope = __ipv6_addr_src_scope(hiscore.addr_type);
1002 				hiscore.rule++;
1003 			}
1004 			score.scope = __ipv6_addr_src_scope(score.addr_type);
1005 			if (hiscore.scope < score.scope) {
1006 				if (hiscore.scope < daddr_scope) {
1007 					score.rule = 2;
1008 					goto record_it;
1009 				} else
1010 					continue;
1011 			} else if (score.scope < hiscore.scope) {
1012 				if (score.scope < daddr_scope)
1013 					break; /* addresses sorted by scope */
1014 				else {
1015 					score.rule = 2;
1016 					goto record_it;
1017 				}
1018 			}
1019 
1020 			/* Rule 3: Avoid deprecated and optimistic addresses */
1021 			if (hiscore.rule < 3) {
1022 				if (ipv6_saddr_preferred(hiscore.addr_type) ||
1023 				   (((ifa_result->flags &
1024 				    (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)) == 0)))
1025 					hiscore.attrs |= IPV6_SADDR_SCORE_PREFERRED;
1026 				hiscore.rule++;
1027 			}
1028 			if (ipv6_saddr_preferred(score.addr_type) ||
1029 			   (((ifa->flags &
1030 			    (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)) == 0))) {
1031 				score.attrs |= IPV6_SADDR_SCORE_PREFERRED;
1032 				if (!(hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)) {
1033 					score.rule = 3;
1034 					goto record_it;
1035 				}
1036 			} else {
1037 				if (hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)
1038 					continue;
1039 			}
1040 
1041 			/* Rule 4: Prefer home address */
1042 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
1043 			if (hiscore.rule < 4) {
1044 				if (ifa_result->flags & IFA_F_HOMEADDRESS)
1045 					hiscore.attrs |= IPV6_SADDR_SCORE_HOA;
1046 				hiscore.rule++;
1047 			}
1048 			if (ifa->flags & IFA_F_HOMEADDRESS) {
1049 				score.attrs |= IPV6_SADDR_SCORE_HOA;
1050 				if (!(ifa_result->flags & IFA_F_HOMEADDRESS)) {
1051 					score.rule = 4;
1052 					goto record_it;
1053 				}
1054 			} else {
1055 				if (hiscore.attrs & IPV6_SADDR_SCORE_HOA)
1056 					continue;
1057 			}
1058 #else
1059 			if (hiscore.rule < 4)
1060 				hiscore.rule++;
1061 #endif
1062 
1063 			/* Rule 5: Prefer outgoing interface */
1064 			if (hiscore.rule < 5) {
1065 				if (daddr_dev == NULL ||
1066 				    daddr_dev == ifa_result->idev->dev)
1067 					hiscore.attrs |= IPV6_SADDR_SCORE_OIF;
1068 				hiscore.rule++;
1069 			}
1070 			if (daddr_dev == NULL ||
1071 			    daddr_dev == ifa->idev->dev) {
1072 				score.attrs |= IPV6_SADDR_SCORE_OIF;
1073 				if (!(hiscore.attrs & IPV6_SADDR_SCORE_OIF)) {
1074 					score.rule = 5;
1075 					goto record_it;
1076 				}
1077 			} else {
1078 				if (hiscore.attrs & IPV6_SADDR_SCORE_OIF)
1079 					continue;
1080 			}
1081 
1082 			/* Rule 6: Prefer matching label */
1083 			if (hiscore.rule < 6) {
1084 				if (ipv6_addr_label(&ifa_result->addr,
1085 						    hiscore.addr_type,
1086 						    ifa_result->idev->dev->ifindex) == daddr_label)
1087 					hiscore.attrs |= IPV6_SADDR_SCORE_LABEL;
1088 				hiscore.rule++;
1089 			}
1090 			if (ipv6_addr_label(&ifa->addr,
1091 					    score.addr_type,
1092 					    ifa->idev->dev->ifindex) == daddr_label) {
1093 				score.attrs |= IPV6_SADDR_SCORE_LABEL;
1094 				if (!(hiscore.attrs & IPV6_SADDR_SCORE_LABEL)) {
1095 					score.rule = 6;
1096 					goto record_it;
1097 				}
1098 			} else {
1099 				if (hiscore.attrs & IPV6_SADDR_SCORE_LABEL)
1100 					continue;
1101 			}
1102 
1103 #ifdef CONFIG_IPV6_PRIVACY
1104 			/* Rule 7: Prefer public address
1105 			 * Note: prefer temprary address if use_tempaddr >= 2
1106 			 */
1107 			if (hiscore.rule < 7) {
1108 				if ((!(ifa_result->flags & IFA_F_TEMPORARY)) ^
1109 				    (ifa_result->idev->cnf.use_tempaddr >= 2))
1110 					hiscore.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1111 				hiscore.rule++;
1112 			}
1113 			if ((!(ifa->flags & IFA_F_TEMPORARY)) ^
1114 			    (ifa->idev->cnf.use_tempaddr >= 2)) {
1115 				score.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1116 				if (!(hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)) {
1117 					score.rule = 7;
1118 					goto record_it;
1119 				}
1120 			} else {
1121 				if (hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)
1122 					continue;
1123 			}
1124 #else
1125 			if (hiscore.rule < 7)
1126 				hiscore.rule++;
1127 #endif
1128 			/* Rule 8: Use longest matching prefix */
1129 			if (hiscore.rule < 8) {
1130 				hiscore.matchlen = ipv6_addr_diff(&ifa_result->addr, daddr);
1131 				hiscore.rule++;
1132 			}
1133 			score.matchlen = ipv6_addr_diff(&ifa->addr, daddr);
1134 			if (score.matchlen > hiscore.matchlen) {
1135 				score.rule = 8;
1136 				goto record_it;
1137 			}
1138 #if 0
1139 			else if (score.matchlen < hiscore.matchlen)
1140 				continue;
1141 #endif
1142 
1143 			/* Final Rule: choose first available one */
1144 			continue;
1145 record_it:
1146 			if (ifa_result)
1147 				in6_ifa_put(ifa_result);
1148 			in6_ifa_hold(ifa);
1149 			ifa_result = ifa;
1150 			hiscore = score;
1151 		}
1152 		read_unlock_bh(&idev->lock);
1153 	}
1154 	rcu_read_unlock();
1155 	read_unlock(&dev_base_lock);
1156 
1157 	if (!ifa_result)
1158 		return -EADDRNOTAVAIL;
1159 
1160 	ipv6_addr_copy(saddr, &ifa_result->addr);
1161 	in6_ifa_put(ifa_result);
1162 	return 0;
1163 }
1164 
1165 
1166 int ipv6_get_saddr(struct dst_entry *dst,
1167 		   struct in6_addr *daddr, struct in6_addr *saddr)
1168 {
1169 	return ipv6_dev_get_saddr(dst ? ip6_dst_idev(dst)->dev : NULL, daddr, saddr);
1170 }
1171 
1172 EXPORT_SYMBOL(ipv6_get_saddr);
1173 
1174 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1175 		    unsigned char banned_flags)
1176 {
1177 	struct inet6_dev *idev;
1178 	int err = -EADDRNOTAVAIL;
1179 
1180 	rcu_read_lock();
1181 	if ((idev = __in6_dev_get(dev)) != NULL) {
1182 		struct inet6_ifaddr *ifp;
1183 
1184 		read_lock_bh(&idev->lock);
1185 		for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1186 			if (ifp->scope == IFA_LINK && !(ifp->flags & banned_flags)) {
1187 				ipv6_addr_copy(addr, &ifp->addr);
1188 				err = 0;
1189 				break;
1190 			}
1191 		}
1192 		read_unlock_bh(&idev->lock);
1193 	}
1194 	rcu_read_unlock();
1195 	return err;
1196 }
1197 
1198 static int ipv6_count_addresses(struct inet6_dev *idev)
1199 {
1200 	int cnt = 0;
1201 	struct inet6_ifaddr *ifp;
1202 
1203 	read_lock_bh(&idev->lock);
1204 	for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1205 		cnt++;
1206 	read_unlock_bh(&idev->lock);
1207 	return cnt;
1208 }
1209 
1210 int ipv6_chk_addr(struct net *net, struct in6_addr *addr,
1211 		  struct net_device *dev, int strict)
1212 {
1213 	struct inet6_ifaddr * ifp;
1214 	u8 hash = ipv6_addr_hash(addr);
1215 
1216 	read_lock_bh(&addrconf_hash_lock);
1217 	for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1218 		if (ifp->idev->dev->nd_net != net)
1219 			continue;
1220 		if (ipv6_addr_equal(&ifp->addr, addr) &&
1221 		    !(ifp->flags&IFA_F_TENTATIVE)) {
1222 			if (dev == NULL || ifp->idev->dev == dev ||
1223 			    !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1224 				break;
1225 		}
1226 	}
1227 	read_unlock_bh(&addrconf_hash_lock);
1228 	return ifp != NULL;
1229 }
1230 EXPORT_SYMBOL(ipv6_chk_addr);
1231 
1232 static
1233 int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1234 		       struct net_device *dev)
1235 {
1236 	struct inet6_ifaddr * ifp;
1237 	u8 hash = ipv6_addr_hash(addr);
1238 
1239 	for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1240 		if (ifp->idev->dev->nd_net != net)
1241 			continue;
1242 		if (ipv6_addr_equal(&ifp->addr, addr)) {
1243 			if (dev == NULL || ifp->idev->dev == dev)
1244 				break;
1245 		}
1246 	}
1247 	return ifp != NULL;
1248 }
1249 
1250 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, struct in6_addr *addr,
1251 				     struct net_device *dev, int strict)
1252 {
1253 	struct inet6_ifaddr * ifp;
1254 	u8 hash = ipv6_addr_hash(addr);
1255 
1256 	read_lock_bh(&addrconf_hash_lock);
1257 	for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1258 		if (ifp->idev->dev->nd_net != net)
1259 			continue;
1260 		if (ipv6_addr_equal(&ifp->addr, addr)) {
1261 			if (dev == NULL || ifp->idev->dev == dev ||
1262 			    !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1263 				in6_ifa_hold(ifp);
1264 				break;
1265 			}
1266 		}
1267 	}
1268 	read_unlock_bh(&addrconf_hash_lock);
1269 
1270 	return ifp;
1271 }
1272 
1273 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1274 {
1275 	const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
1276 	const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
1277 	__be32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
1278 	__be32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1279 	int sk_ipv6only = ipv6_only_sock(sk);
1280 	int sk2_ipv6only = inet_v6_ipv6only(sk2);
1281 	int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1282 	int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1283 
1284 	if (!sk2_rcv_saddr && !sk_ipv6only)
1285 		return 1;
1286 
1287 	if (addr_type2 == IPV6_ADDR_ANY &&
1288 	    !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1289 		return 1;
1290 
1291 	if (addr_type == IPV6_ADDR_ANY &&
1292 	    !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1293 		return 1;
1294 
1295 	if (sk2_rcv_saddr6 &&
1296 	    ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1297 		return 1;
1298 
1299 	if (addr_type == IPV6_ADDR_MAPPED &&
1300 	    !sk2_ipv6only &&
1301 	    (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1302 		return 1;
1303 
1304 	return 0;
1305 }
1306 
1307 /* Gets referenced address, destroys ifaddr */
1308 
1309 static void addrconf_dad_stop(struct inet6_ifaddr *ifp)
1310 {
1311 	if (ifp->flags&IFA_F_PERMANENT) {
1312 		spin_lock_bh(&ifp->lock);
1313 		addrconf_del_timer(ifp);
1314 		ifp->flags |= IFA_F_TENTATIVE;
1315 		spin_unlock_bh(&ifp->lock);
1316 		in6_ifa_put(ifp);
1317 #ifdef CONFIG_IPV6_PRIVACY
1318 	} else if (ifp->flags&IFA_F_TEMPORARY) {
1319 		struct inet6_ifaddr *ifpub;
1320 		spin_lock_bh(&ifp->lock);
1321 		ifpub = ifp->ifpub;
1322 		if (ifpub) {
1323 			in6_ifa_hold(ifpub);
1324 			spin_unlock_bh(&ifp->lock);
1325 			ipv6_create_tempaddr(ifpub, ifp);
1326 			in6_ifa_put(ifpub);
1327 		} else {
1328 			spin_unlock_bh(&ifp->lock);
1329 		}
1330 		ipv6_del_addr(ifp);
1331 #endif
1332 	} else
1333 		ipv6_del_addr(ifp);
1334 }
1335 
1336 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1337 {
1338 	if (net_ratelimit())
1339 		printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1340 	addrconf_dad_stop(ifp);
1341 }
1342 
1343 /* Join to solicited addr multicast group. */
1344 
1345 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1346 {
1347 	struct in6_addr maddr;
1348 
1349 	if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1350 		return;
1351 
1352 	addrconf_addr_solict_mult(addr, &maddr);
1353 	ipv6_dev_mc_inc(dev, &maddr);
1354 }
1355 
1356 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1357 {
1358 	struct in6_addr maddr;
1359 
1360 	if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1361 		return;
1362 
1363 	addrconf_addr_solict_mult(addr, &maddr);
1364 	__ipv6_dev_mc_dec(idev, &maddr);
1365 }
1366 
1367 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1368 {
1369 	struct in6_addr addr;
1370 	ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1371 	if (ipv6_addr_any(&addr))
1372 		return;
1373 	ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1374 }
1375 
1376 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1377 {
1378 	struct in6_addr addr;
1379 	ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1380 	if (ipv6_addr_any(&addr))
1381 		return;
1382 	__ipv6_dev_ac_dec(ifp->idev, &addr);
1383 }
1384 
1385 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1386 {
1387 	if (dev->addr_len != ETH_ALEN)
1388 		return -1;
1389 	memcpy(eui, dev->dev_addr, 3);
1390 	memcpy(eui + 5, dev->dev_addr + 3, 3);
1391 
1392 	/*
1393 	 * The zSeries OSA network cards can be shared among various
1394 	 * OS instances, but the OSA cards have only one MAC address.
1395 	 * This leads to duplicate address conflicts in conjunction
1396 	 * with IPv6 if more than one instance uses the same card.
1397 	 *
1398 	 * The driver for these cards can deliver a unique 16-bit
1399 	 * identifier for each instance sharing the same card.  It is
1400 	 * placed instead of 0xFFFE in the interface identifier.  The
1401 	 * "u" bit of the interface identifier is not inverted in this
1402 	 * case.  Hence the resulting interface identifier has local
1403 	 * scope according to RFC2373.
1404 	 */
1405 	if (dev->dev_id) {
1406 		eui[3] = (dev->dev_id >> 8) & 0xFF;
1407 		eui[4] = dev->dev_id & 0xFF;
1408 	} else {
1409 		eui[3] = 0xFF;
1410 		eui[4] = 0xFE;
1411 		eui[0] ^= 2;
1412 	}
1413 	return 0;
1414 }
1415 
1416 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1417 {
1418 	/* XXX: inherit EUI-64 from other interface -- yoshfuji */
1419 	if (dev->addr_len != ARCNET_ALEN)
1420 		return -1;
1421 	memset(eui, 0, 7);
1422 	eui[7] = *(u8*)dev->dev_addr;
1423 	return 0;
1424 }
1425 
1426 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1427 {
1428 	if (dev->addr_len != INFINIBAND_ALEN)
1429 		return -1;
1430 	memcpy(eui, dev->dev_addr + 12, 8);
1431 	eui[0] |= 2;
1432 	return 0;
1433 }
1434 
1435 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1436 {
1437 	switch (dev->type) {
1438 	case ARPHRD_ETHER:
1439 	case ARPHRD_FDDI:
1440 	case ARPHRD_IEEE802_TR:
1441 		return addrconf_ifid_eui48(eui, dev);
1442 	case ARPHRD_ARCNET:
1443 		return addrconf_ifid_arcnet(eui, dev);
1444 	case ARPHRD_INFINIBAND:
1445 		return addrconf_ifid_infiniband(eui, dev);
1446 	case ARPHRD_SIT:
1447 		if (dev->priv_flags & IFF_ISATAP)
1448 			return ipv6_isatap_eui64(eui, *(__be32 *)dev->dev_addr);
1449 	}
1450 	return -1;
1451 }
1452 
1453 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1454 {
1455 	int err = -1;
1456 	struct inet6_ifaddr *ifp;
1457 
1458 	read_lock_bh(&idev->lock);
1459 	for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1460 		if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1461 			memcpy(eui, ifp->addr.s6_addr+8, 8);
1462 			err = 0;
1463 			break;
1464 		}
1465 	}
1466 	read_unlock_bh(&idev->lock);
1467 	return err;
1468 }
1469 
1470 #ifdef CONFIG_IPV6_PRIVACY
1471 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1472 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1473 {
1474 regen:
1475 	get_random_bytes(idev->rndid, sizeof(idev->rndid));
1476 	idev->rndid[0] &= ~0x02;
1477 
1478 	/*
1479 	 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1480 	 * check if generated address is not inappropriate
1481 	 *
1482 	 *  - Reserved subnet anycast (RFC 2526)
1483 	 *	11111101 11....11 1xxxxxxx
1484 	 *  - ISATAP (RFC4214) 6.1
1485 	 *	00-00-5E-FE-xx-xx-xx-xx
1486 	 *  - value 0
1487 	 *  - XXX: already assigned to an address on the device
1488 	 */
1489 	if (idev->rndid[0] == 0xfd &&
1490 	    (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1491 	    (idev->rndid[7]&0x80))
1492 		goto regen;
1493 	if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1494 		if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1495 			goto regen;
1496 		if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1497 			goto regen;
1498 	}
1499 
1500 	return 0;
1501 }
1502 
1503 static void ipv6_regen_rndid(unsigned long data)
1504 {
1505 	struct inet6_dev *idev = (struct inet6_dev *) data;
1506 	unsigned long expires;
1507 
1508 	rcu_read_lock_bh();
1509 	write_lock_bh(&idev->lock);
1510 
1511 	if (idev->dead)
1512 		goto out;
1513 
1514 	if (__ipv6_regen_rndid(idev) < 0)
1515 		goto out;
1516 
1517 	expires = jiffies +
1518 		idev->cnf.temp_prefered_lft * HZ -
1519 		idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1520 	if (time_before(expires, jiffies)) {
1521 		printk(KERN_WARNING
1522 			"ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1523 			idev->dev->name);
1524 		goto out;
1525 	}
1526 
1527 	if (!mod_timer(&idev->regen_timer, expires))
1528 		in6_dev_hold(idev);
1529 
1530 out:
1531 	write_unlock_bh(&idev->lock);
1532 	rcu_read_unlock_bh();
1533 	in6_dev_put(idev);
1534 }
1535 
1536 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1537 	int ret = 0;
1538 
1539 	if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1540 		ret = __ipv6_regen_rndid(idev);
1541 	return ret;
1542 }
1543 #endif
1544 
1545 /*
1546  *	Add prefix route.
1547  */
1548 
1549 static void
1550 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1551 		      unsigned long expires, u32 flags)
1552 {
1553 	struct fib6_config cfg = {
1554 		.fc_table = RT6_TABLE_PREFIX,
1555 		.fc_metric = IP6_RT_PRIO_ADDRCONF,
1556 		.fc_ifindex = dev->ifindex,
1557 		.fc_expires = expires,
1558 		.fc_dst_len = plen,
1559 		.fc_flags = RTF_UP | flags,
1560 	};
1561 
1562 	ipv6_addr_copy(&cfg.fc_dst, pfx);
1563 
1564 	/* Prevent useless cloning on PtP SIT.
1565 	   This thing is done here expecting that the whole
1566 	   class of non-broadcast devices need not cloning.
1567 	 */
1568 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1569 	if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1570 		cfg.fc_flags |= RTF_NONEXTHOP;
1571 #endif
1572 
1573 	ip6_route_add(&cfg);
1574 }
1575 
1576 /* Create "default" multicast route to the interface */
1577 
1578 static void addrconf_add_mroute(struct net_device *dev)
1579 {
1580 	struct fib6_config cfg = {
1581 		.fc_table = RT6_TABLE_LOCAL,
1582 		.fc_metric = IP6_RT_PRIO_ADDRCONF,
1583 		.fc_ifindex = dev->ifindex,
1584 		.fc_dst_len = 8,
1585 		.fc_flags = RTF_UP,
1586 	};
1587 
1588 	ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1589 
1590 	ip6_route_add(&cfg);
1591 }
1592 
1593 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1594 static void sit_route_add(struct net_device *dev)
1595 {
1596 	struct fib6_config cfg = {
1597 		.fc_table = RT6_TABLE_MAIN,
1598 		.fc_metric = IP6_RT_PRIO_ADDRCONF,
1599 		.fc_ifindex = dev->ifindex,
1600 		.fc_dst_len = 96,
1601 		.fc_flags = RTF_UP | RTF_NONEXTHOP,
1602 	};
1603 
1604 	/* prefix length - 96 bits "::d.d.d.d" */
1605 	ip6_route_add(&cfg);
1606 }
1607 #endif
1608 
1609 static void addrconf_add_lroute(struct net_device *dev)
1610 {
1611 	struct in6_addr addr;
1612 
1613 	ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
1614 	addrconf_prefix_route(&addr, 64, dev, 0, 0);
1615 }
1616 
1617 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1618 {
1619 	struct inet6_dev *idev;
1620 
1621 	ASSERT_RTNL();
1622 
1623 	if ((idev = ipv6_find_idev(dev)) == NULL)
1624 		return NULL;
1625 
1626 	/* Add default multicast route */
1627 	addrconf_add_mroute(dev);
1628 
1629 	/* Add link local route */
1630 	addrconf_add_lroute(dev);
1631 	return idev;
1632 }
1633 
1634 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1635 {
1636 	struct prefix_info *pinfo;
1637 	__u32 valid_lft;
1638 	__u32 prefered_lft;
1639 	int addr_type;
1640 	unsigned long rt_expires;
1641 	struct inet6_dev *in6_dev;
1642 
1643 	pinfo = (struct prefix_info *) opt;
1644 
1645 	if (len < sizeof(struct prefix_info)) {
1646 		ADBG(("addrconf: prefix option too short\n"));
1647 		return;
1648 	}
1649 
1650 	/*
1651 	 *	Validation checks ([ADDRCONF], page 19)
1652 	 */
1653 
1654 	addr_type = ipv6_addr_type(&pinfo->prefix);
1655 
1656 	if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1657 		return;
1658 
1659 	valid_lft = ntohl(pinfo->valid);
1660 	prefered_lft = ntohl(pinfo->prefered);
1661 
1662 	if (prefered_lft > valid_lft) {
1663 		if (net_ratelimit())
1664 			printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1665 		return;
1666 	}
1667 
1668 	in6_dev = in6_dev_get(dev);
1669 
1670 	if (in6_dev == NULL) {
1671 		if (net_ratelimit())
1672 			printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1673 		return;
1674 	}
1675 
1676 	/*
1677 	 *	Two things going on here:
1678 	 *	1) Add routes for on-link prefixes
1679 	 *	2) Configure prefixes with the auto flag set
1680 	 */
1681 
1682 	/* Avoid arithmetic overflow. Really, we could
1683 	   save rt_expires in seconds, likely valid_lft,
1684 	   but it would require division in fib gc, that it
1685 	   not good.
1686 	 */
1687 	if (valid_lft >= 0x7FFFFFFF/HZ)
1688 		rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ);
1689 	else
1690 		rt_expires = valid_lft * HZ;
1691 
1692 	/*
1693 	 * We convert this (in jiffies) to clock_t later.
1694 	 * Avoid arithmetic overflow there as well.
1695 	 * Overflow can happen only if HZ < USER_HZ.
1696 	 */
1697 	if (HZ < USER_HZ && rt_expires > 0x7FFFFFFF / USER_HZ)
1698 		rt_expires = 0x7FFFFFFF / USER_HZ;
1699 
1700 	if (pinfo->onlink) {
1701 		struct rt6_info *rt;
1702 		rt = rt6_lookup(&pinfo->prefix, NULL, dev->ifindex, 1);
1703 
1704 		if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
1705 			if (rt->rt6i_flags&RTF_EXPIRES) {
1706 				if (valid_lft == 0) {
1707 					ip6_del_rt(rt);
1708 					rt = NULL;
1709 				} else {
1710 					rt->rt6i_expires = jiffies + rt_expires;
1711 				}
1712 			}
1713 		} else if (valid_lft) {
1714 			addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1715 					      dev, jiffies_to_clock_t(rt_expires), RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT);
1716 		}
1717 		if (rt)
1718 			dst_release(&rt->u.dst);
1719 	}
1720 
1721 	/* Try to figure out our local address for this prefix */
1722 
1723 	if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1724 		struct inet6_ifaddr * ifp;
1725 		struct in6_addr addr;
1726 		int create = 0, update_lft = 0;
1727 
1728 		if (pinfo->prefix_len == 64) {
1729 			memcpy(&addr, &pinfo->prefix, 8);
1730 			if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1731 			    ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1732 				in6_dev_put(in6_dev);
1733 				return;
1734 			}
1735 			goto ok;
1736 		}
1737 		if (net_ratelimit())
1738 			printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1739 			       pinfo->prefix_len);
1740 		in6_dev_put(in6_dev);
1741 		return;
1742 
1743 ok:
1744 
1745 		ifp = ipv6_get_ifaddr(&init_net, &addr, dev, 1);
1746 
1747 		if (ifp == NULL && valid_lft) {
1748 			int max_addresses = in6_dev->cnf.max_addresses;
1749 			u32 addr_flags = 0;
1750 
1751 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1752 			if (in6_dev->cnf.optimistic_dad &&
1753 			    !ipv6_devconf.forwarding)
1754 				addr_flags = IFA_F_OPTIMISTIC;
1755 #endif
1756 
1757 			/* Do not allow to create too much of autoconfigured
1758 			 * addresses; this would be too easy way to crash kernel.
1759 			 */
1760 			if (!max_addresses ||
1761 			    ipv6_count_addresses(in6_dev) < max_addresses)
1762 				ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1763 						    addr_type&IPV6_ADDR_SCOPE_MASK,
1764 						    addr_flags);
1765 
1766 			if (!ifp || IS_ERR(ifp)) {
1767 				in6_dev_put(in6_dev);
1768 				return;
1769 			}
1770 
1771 			update_lft = create = 1;
1772 			ifp->cstamp = jiffies;
1773 			addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1774 		}
1775 
1776 		if (ifp) {
1777 			int flags;
1778 			unsigned long now;
1779 #ifdef CONFIG_IPV6_PRIVACY
1780 			struct inet6_ifaddr *ift;
1781 #endif
1782 			u32 stored_lft;
1783 
1784 			/* update lifetime (RFC2462 5.5.3 e) */
1785 			spin_lock(&ifp->lock);
1786 			now = jiffies;
1787 			if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1788 				stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1789 			else
1790 				stored_lft = 0;
1791 			if (!update_lft && stored_lft) {
1792 				if (valid_lft > MIN_VALID_LIFETIME ||
1793 				    valid_lft > stored_lft)
1794 					update_lft = 1;
1795 				else if (stored_lft <= MIN_VALID_LIFETIME) {
1796 					/* valid_lft <= stored_lft is always true */
1797 					/* XXX: IPsec */
1798 					update_lft = 0;
1799 				} else {
1800 					valid_lft = MIN_VALID_LIFETIME;
1801 					if (valid_lft < prefered_lft)
1802 						prefered_lft = valid_lft;
1803 					update_lft = 1;
1804 				}
1805 			}
1806 
1807 			if (update_lft) {
1808 				ifp->valid_lft = valid_lft;
1809 				ifp->prefered_lft = prefered_lft;
1810 				ifp->tstamp = now;
1811 				flags = ifp->flags;
1812 				ifp->flags &= ~IFA_F_DEPRECATED;
1813 				spin_unlock(&ifp->lock);
1814 
1815 				if (!(flags&IFA_F_TENTATIVE))
1816 					ipv6_ifa_notify(0, ifp);
1817 			} else
1818 				spin_unlock(&ifp->lock);
1819 
1820 #ifdef CONFIG_IPV6_PRIVACY
1821 			read_lock_bh(&in6_dev->lock);
1822 			/* update all temporary addresses in the list */
1823 			for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1824 				/*
1825 				 * When adjusting the lifetimes of an existing
1826 				 * temporary address, only lower the lifetimes.
1827 				 * Implementations must not increase the
1828 				 * lifetimes of an existing temporary address
1829 				 * when processing a Prefix Information Option.
1830 				 */
1831 				spin_lock(&ift->lock);
1832 				flags = ift->flags;
1833 				if (ift->valid_lft > valid_lft &&
1834 				    ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1835 					ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1836 				if (ift->prefered_lft > prefered_lft &&
1837 				    ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1838 					ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1839 				spin_unlock(&ift->lock);
1840 				if (!(flags&IFA_F_TENTATIVE))
1841 					ipv6_ifa_notify(0, ift);
1842 			}
1843 
1844 			if (create && in6_dev->cnf.use_tempaddr > 0) {
1845 				/*
1846 				 * When a new public address is created as described in [ADDRCONF],
1847 				 * also create a new temporary address.
1848 				 */
1849 				read_unlock_bh(&in6_dev->lock);
1850 				ipv6_create_tempaddr(ifp, NULL);
1851 			} else {
1852 				read_unlock_bh(&in6_dev->lock);
1853 			}
1854 #endif
1855 			in6_ifa_put(ifp);
1856 			addrconf_verify(0);
1857 		}
1858 	}
1859 	inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
1860 	in6_dev_put(in6_dev);
1861 }
1862 
1863 /*
1864  *	Set destination address.
1865  *	Special case for SIT interfaces where we create a new "virtual"
1866  *	device.
1867  */
1868 int addrconf_set_dstaddr(void __user *arg)
1869 {
1870 	struct in6_ifreq ireq;
1871 	struct net_device *dev;
1872 	int err = -EINVAL;
1873 
1874 	rtnl_lock();
1875 
1876 	err = -EFAULT;
1877 	if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1878 		goto err_exit;
1879 
1880 	dev = __dev_get_by_index(&init_net, ireq.ifr6_ifindex);
1881 
1882 	err = -ENODEV;
1883 	if (dev == NULL)
1884 		goto err_exit;
1885 
1886 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1887 	if (dev->type == ARPHRD_SIT) {
1888 		struct ifreq ifr;
1889 		mm_segment_t	oldfs;
1890 		struct ip_tunnel_parm p;
1891 
1892 		err = -EADDRNOTAVAIL;
1893 		if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
1894 			goto err_exit;
1895 
1896 		memset(&p, 0, sizeof(p));
1897 		p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
1898 		p.iph.saddr = 0;
1899 		p.iph.version = 4;
1900 		p.iph.ihl = 5;
1901 		p.iph.protocol = IPPROTO_IPV6;
1902 		p.iph.ttl = 64;
1903 		ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1904 
1905 		oldfs = get_fs(); set_fs(KERNEL_DS);
1906 		err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
1907 		set_fs(oldfs);
1908 
1909 		if (err == 0) {
1910 			err = -ENOBUFS;
1911 			if ((dev = __dev_get_by_name(&init_net, p.name)) == NULL)
1912 				goto err_exit;
1913 			err = dev_open(dev);
1914 		}
1915 	}
1916 #endif
1917 
1918 err_exit:
1919 	rtnl_unlock();
1920 	return err;
1921 }
1922 
1923 /*
1924  *	Manual configuration of address on an interface
1925  */
1926 static int inet6_addr_add(int ifindex, struct in6_addr *pfx, int plen,
1927 			  __u8 ifa_flags, __u32 prefered_lft, __u32 valid_lft)
1928 {
1929 	struct inet6_ifaddr *ifp;
1930 	struct inet6_dev *idev;
1931 	struct net_device *dev;
1932 	int scope;
1933 	u32 flags = RTF_EXPIRES;
1934 
1935 	ASSERT_RTNL();
1936 
1937 	/* check the lifetime */
1938 	if (!valid_lft || prefered_lft > valid_lft)
1939 		return -EINVAL;
1940 
1941 	if ((dev = __dev_get_by_index(&init_net, ifindex)) == NULL)
1942 		return -ENODEV;
1943 
1944 	if ((idev = addrconf_add_dev(dev)) == NULL)
1945 		return -ENOBUFS;
1946 
1947 	scope = ipv6_addr_scope(pfx);
1948 
1949 	if (valid_lft == INFINITY_LIFE_TIME) {
1950 		ifa_flags |= IFA_F_PERMANENT;
1951 		flags = 0;
1952 	} else if (valid_lft >= 0x7FFFFFFF/HZ)
1953 		valid_lft = 0x7FFFFFFF/HZ;
1954 
1955 	if (prefered_lft == 0)
1956 		ifa_flags |= IFA_F_DEPRECATED;
1957 	else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
1958 		 (prefered_lft != INFINITY_LIFE_TIME))
1959 		prefered_lft = 0x7FFFFFFF/HZ;
1960 
1961 	ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
1962 
1963 	if (!IS_ERR(ifp)) {
1964 		spin_lock_bh(&ifp->lock);
1965 		ifp->valid_lft = valid_lft;
1966 		ifp->prefered_lft = prefered_lft;
1967 		ifp->tstamp = jiffies;
1968 		spin_unlock_bh(&ifp->lock);
1969 
1970 		addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
1971 				      jiffies_to_clock_t(valid_lft * HZ), flags);
1972 		/*
1973 		 * Note that section 3.1 of RFC 4429 indicates
1974 		 * that the Optimistic flag should not be set for
1975 		 * manually configured addresses
1976 		 */
1977 		addrconf_dad_start(ifp, 0);
1978 		in6_ifa_put(ifp);
1979 		addrconf_verify(0);
1980 		return 0;
1981 	}
1982 
1983 	return PTR_ERR(ifp);
1984 }
1985 
1986 static int inet6_addr_del(int ifindex, struct in6_addr *pfx, int plen)
1987 {
1988 	struct inet6_ifaddr *ifp;
1989 	struct inet6_dev *idev;
1990 	struct net_device *dev;
1991 
1992 	if ((dev = __dev_get_by_index(&init_net, ifindex)) == NULL)
1993 		return -ENODEV;
1994 
1995 	if ((idev = __in6_dev_get(dev)) == NULL)
1996 		return -ENXIO;
1997 
1998 	read_lock_bh(&idev->lock);
1999 	for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
2000 		if (ifp->prefix_len == plen &&
2001 		    ipv6_addr_equal(pfx, &ifp->addr)) {
2002 			in6_ifa_hold(ifp);
2003 			read_unlock_bh(&idev->lock);
2004 
2005 			ipv6_del_addr(ifp);
2006 
2007 			/* If the last address is deleted administratively,
2008 			   disable IPv6 on this interface.
2009 			 */
2010 			if (idev->addr_list == NULL)
2011 				addrconf_ifdown(idev->dev, 1);
2012 			return 0;
2013 		}
2014 	}
2015 	read_unlock_bh(&idev->lock);
2016 	return -EADDRNOTAVAIL;
2017 }
2018 
2019 
2020 int addrconf_add_ifaddr(void __user *arg)
2021 {
2022 	struct in6_ifreq ireq;
2023 	int err;
2024 
2025 	if (!capable(CAP_NET_ADMIN))
2026 		return -EPERM;
2027 
2028 	if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2029 		return -EFAULT;
2030 
2031 	rtnl_lock();
2032 	err = inet6_addr_add(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen,
2033 			     IFA_F_PERMANENT, INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2034 	rtnl_unlock();
2035 	return err;
2036 }
2037 
2038 int addrconf_del_ifaddr(void __user *arg)
2039 {
2040 	struct in6_ifreq ireq;
2041 	int err;
2042 
2043 	if (!capable(CAP_NET_ADMIN))
2044 		return -EPERM;
2045 
2046 	if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2047 		return -EFAULT;
2048 
2049 	rtnl_lock();
2050 	err = inet6_addr_del(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
2051 	rtnl_unlock();
2052 	return err;
2053 }
2054 
2055 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2056 static void sit_add_v4_addrs(struct inet6_dev *idev)
2057 {
2058 	struct inet6_ifaddr * ifp;
2059 	struct in6_addr addr;
2060 	struct net_device *dev;
2061 	int scope;
2062 
2063 	ASSERT_RTNL();
2064 
2065 	memset(&addr, 0, sizeof(struct in6_addr));
2066 	memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2067 
2068 	if (idev->dev->flags&IFF_POINTOPOINT) {
2069 		addr.s6_addr32[0] = htonl(0xfe800000);
2070 		scope = IFA_LINK;
2071 	} else {
2072 		scope = IPV6_ADDR_COMPATv4;
2073 	}
2074 
2075 	if (addr.s6_addr32[3]) {
2076 		ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
2077 		if (!IS_ERR(ifp)) {
2078 			spin_lock_bh(&ifp->lock);
2079 			ifp->flags &= ~IFA_F_TENTATIVE;
2080 			spin_unlock_bh(&ifp->lock);
2081 			ipv6_ifa_notify(RTM_NEWADDR, ifp);
2082 			in6_ifa_put(ifp);
2083 		}
2084 		return;
2085 	}
2086 
2087 	for_each_netdev(&init_net, dev) {
2088 		struct in_device * in_dev = __in_dev_get_rtnl(dev);
2089 		if (in_dev && (dev->flags & IFF_UP)) {
2090 			struct in_ifaddr * ifa;
2091 
2092 			int flag = scope;
2093 
2094 			for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2095 				int plen;
2096 
2097 				addr.s6_addr32[3] = ifa->ifa_local;
2098 
2099 				if (ifa->ifa_scope == RT_SCOPE_LINK)
2100 					continue;
2101 				if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2102 					if (idev->dev->flags&IFF_POINTOPOINT)
2103 						continue;
2104 					flag |= IFA_HOST;
2105 				}
2106 				if (idev->dev->flags&IFF_POINTOPOINT)
2107 					plen = 64;
2108 				else
2109 					plen = 96;
2110 
2111 				ifp = ipv6_add_addr(idev, &addr, plen, flag,
2112 						    IFA_F_PERMANENT);
2113 				if (!IS_ERR(ifp)) {
2114 					spin_lock_bh(&ifp->lock);
2115 					ifp->flags &= ~IFA_F_TENTATIVE;
2116 					spin_unlock_bh(&ifp->lock);
2117 					ipv6_ifa_notify(RTM_NEWADDR, ifp);
2118 					in6_ifa_put(ifp);
2119 				}
2120 			}
2121 		}
2122 	}
2123 }
2124 #endif
2125 
2126 static void init_loopback(struct net_device *dev)
2127 {
2128 	struct inet6_dev  *idev;
2129 	struct inet6_ifaddr * ifp;
2130 
2131 	/* ::1 */
2132 
2133 	ASSERT_RTNL();
2134 
2135 	if ((idev = ipv6_find_idev(dev)) == NULL) {
2136 		printk(KERN_DEBUG "init loopback: add_dev failed\n");
2137 		return;
2138 	}
2139 
2140 	ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
2141 	if (!IS_ERR(ifp)) {
2142 		spin_lock_bh(&ifp->lock);
2143 		ifp->flags &= ~IFA_F_TENTATIVE;
2144 		spin_unlock_bh(&ifp->lock);
2145 		ipv6_ifa_notify(RTM_NEWADDR, ifp);
2146 		in6_ifa_put(ifp);
2147 	}
2148 }
2149 
2150 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2151 {
2152 	struct inet6_ifaddr * ifp;
2153 	u32 addr_flags = IFA_F_PERMANENT;
2154 
2155 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2156 	if (idev->cnf.optimistic_dad &&
2157 	    !ipv6_devconf.forwarding)
2158 		addr_flags |= IFA_F_OPTIMISTIC;
2159 #endif
2160 
2161 
2162 	ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2163 	if (!IS_ERR(ifp)) {
2164 		addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2165 		addrconf_dad_start(ifp, 0);
2166 		in6_ifa_put(ifp);
2167 	}
2168 }
2169 
2170 static void addrconf_dev_config(struct net_device *dev)
2171 {
2172 	struct in6_addr addr;
2173 	struct inet6_dev    * idev;
2174 
2175 	ASSERT_RTNL();
2176 
2177 	if ((dev->type != ARPHRD_ETHER) &&
2178 	    (dev->type != ARPHRD_FDDI) &&
2179 	    (dev->type != ARPHRD_IEEE802_TR) &&
2180 	    (dev->type != ARPHRD_ARCNET) &&
2181 	    (dev->type != ARPHRD_INFINIBAND)) {
2182 		/* Alas, we support only Ethernet autoconfiguration. */
2183 		return;
2184 	}
2185 
2186 	idev = addrconf_add_dev(dev);
2187 	if (idev == NULL)
2188 		return;
2189 
2190 	memset(&addr, 0, sizeof(struct in6_addr));
2191 	addr.s6_addr32[0] = htonl(0xFE800000);
2192 
2193 	if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2194 		addrconf_add_linklocal(idev, &addr);
2195 }
2196 
2197 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2198 static void addrconf_sit_config(struct net_device *dev)
2199 {
2200 	struct inet6_dev *idev;
2201 
2202 	ASSERT_RTNL();
2203 
2204 	/*
2205 	 * Configure the tunnel with one of our IPv4
2206 	 * addresses... we should configure all of
2207 	 * our v4 addrs in the tunnel
2208 	 */
2209 
2210 	if ((idev = ipv6_find_idev(dev)) == NULL) {
2211 		printk(KERN_DEBUG "init sit: add_dev failed\n");
2212 		return;
2213 	}
2214 
2215 	if (dev->priv_flags & IFF_ISATAP) {
2216 		struct in6_addr addr;
2217 
2218 		ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
2219 		addrconf_prefix_route(&addr, 64, dev, 0, 0);
2220 		if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2221 			addrconf_add_linklocal(idev, &addr);
2222 		return;
2223 	}
2224 
2225 	sit_add_v4_addrs(idev);
2226 
2227 	if (dev->flags&IFF_POINTOPOINT) {
2228 		addrconf_add_mroute(dev);
2229 		addrconf_add_lroute(dev);
2230 	} else
2231 		sit_route_add(dev);
2232 }
2233 #endif
2234 
2235 static inline int
2236 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2237 {
2238 	struct in6_addr lladdr;
2239 
2240 	if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2241 		addrconf_add_linklocal(idev, &lladdr);
2242 		return 0;
2243 	}
2244 	return -1;
2245 }
2246 
2247 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2248 {
2249 	struct net_device *link_dev;
2250 
2251 	/* first try to inherit the link-local address from the link device */
2252 	if (idev->dev->iflink &&
2253 	    (link_dev = __dev_get_by_index(&init_net, idev->dev->iflink))) {
2254 		if (!ipv6_inherit_linklocal(idev, link_dev))
2255 			return;
2256 	}
2257 	/* then try to inherit it from any device */
2258 	for_each_netdev(&init_net, link_dev) {
2259 		if (!ipv6_inherit_linklocal(idev, link_dev))
2260 			return;
2261 	}
2262 	printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2263 }
2264 
2265 /*
2266  * Autoconfigure tunnel with a link-local address so routing protocols,
2267  * DHCPv6, MLD etc. can be run over the virtual link
2268  */
2269 
2270 static void addrconf_ip6_tnl_config(struct net_device *dev)
2271 {
2272 	struct inet6_dev *idev;
2273 
2274 	ASSERT_RTNL();
2275 
2276 	if ((idev = addrconf_add_dev(dev)) == NULL) {
2277 		printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2278 		return;
2279 	}
2280 	ip6_tnl_add_linklocal(idev);
2281 }
2282 
2283 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2284 			   void * data)
2285 {
2286 	struct net_device *dev = (struct net_device *) data;
2287 	struct inet6_dev *idev = __in6_dev_get(dev);
2288 	int run_pending = 0;
2289 	int err;
2290 
2291 	if (dev->nd_net != &init_net)
2292 		return NOTIFY_DONE;
2293 
2294 	switch(event) {
2295 	case NETDEV_REGISTER:
2296 		if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2297 			idev = ipv6_add_dev(dev);
2298 			if (!idev)
2299 				return notifier_from_errno(-ENOMEM);
2300 		}
2301 		break;
2302 	case NETDEV_UP:
2303 	case NETDEV_CHANGE:
2304 		if (dev->flags & IFF_SLAVE)
2305 			break;
2306 
2307 		if (event == NETDEV_UP) {
2308 			if (!addrconf_qdisc_ok(dev)) {
2309 				/* device is not ready yet. */
2310 				printk(KERN_INFO
2311 					"ADDRCONF(NETDEV_UP): %s: "
2312 					"link is not ready\n",
2313 					dev->name);
2314 				break;
2315 			}
2316 
2317 			if (!idev && dev->mtu >= IPV6_MIN_MTU)
2318 				idev = ipv6_add_dev(dev);
2319 
2320 			if (idev)
2321 				idev->if_flags |= IF_READY;
2322 		} else {
2323 			if (!addrconf_qdisc_ok(dev)) {
2324 				/* device is still not ready. */
2325 				break;
2326 			}
2327 
2328 			if (idev) {
2329 				if (idev->if_flags & IF_READY) {
2330 					/* device is already configured. */
2331 					break;
2332 				}
2333 				idev->if_flags |= IF_READY;
2334 			}
2335 
2336 			printk(KERN_INFO
2337 					"ADDRCONF(NETDEV_CHANGE): %s: "
2338 					"link becomes ready\n",
2339 					dev->name);
2340 
2341 			run_pending = 1;
2342 		}
2343 
2344 		switch(dev->type) {
2345 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2346 		case ARPHRD_SIT:
2347 			addrconf_sit_config(dev);
2348 			break;
2349 #endif
2350 		case ARPHRD_TUNNEL6:
2351 			addrconf_ip6_tnl_config(dev);
2352 			break;
2353 		case ARPHRD_LOOPBACK:
2354 			init_loopback(dev);
2355 			break;
2356 
2357 		default:
2358 			addrconf_dev_config(dev);
2359 			break;
2360 		}
2361 		if (idev) {
2362 			if (run_pending)
2363 				addrconf_dad_run(idev);
2364 
2365 			/* If the MTU changed during the interface down, when the
2366 			   interface up, the changed MTU must be reflected in the
2367 			   idev as well as routers.
2368 			 */
2369 			if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2370 				rt6_mtu_change(dev, dev->mtu);
2371 				idev->cnf.mtu6 = dev->mtu;
2372 			}
2373 			idev->tstamp = jiffies;
2374 			inet6_ifinfo_notify(RTM_NEWLINK, idev);
2375 			/* If the changed mtu during down is lower than IPV6_MIN_MTU
2376 			   stop IPv6 on this interface.
2377 			 */
2378 			if (dev->mtu < IPV6_MIN_MTU)
2379 				addrconf_ifdown(dev, event != NETDEV_DOWN);
2380 		}
2381 		break;
2382 
2383 	case NETDEV_CHANGEMTU:
2384 		if (idev && dev->mtu >= IPV6_MIN_MTU) {
2385 			rt6_mtu_change(dev, dev->mtu);
2386 			idev->cnf.mtu6 = dev->mtu;
2387 			break;
2388 		}
2389 
2390 		if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2391 			idev = ipv6_add_dev(dev);
2392 			if (idev)
2393 				break;
2394 		}
2395 
2396 		/* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2397 
2398 	case NETDEV_DOWN:
2399 	case NETDEV_UNREGISTER:
2400 		/*
2401 		 *	Remove all addresses from this interface.
2402 		 */
2403 		addrconf_ifdown(dev, event != NETDEV_DOWN);
2404 		break;
2405 
2406 	case NETDEV_CHANGENAME:
2407 		if (idev) {
2408 			snmp6_unregister_dev(idev);
2409 			addrconf_sysctl_unregister(idev);
2410 			addrconf_sysctl_register(idev);
2411 			err = snmp6_register_dev(idev);
2412 			if (err)
2413 				return notifier_from_errno(err);
2414 		}
2415 		break;
2416 	}
2417 
2418 	return NOTIFY_OK;
2419 }
2420 
2421 /*
2422  *	addrconf module should be notified of a device going up
2423  */
2424 static struct notifier_block ipv6_dev_notf = {
2425 	.notifier_call = addrconf_notify,
2426 	.priority = 0
2427 };
2428 
2429 static int addrconf_ifdown(struct net_device *dev, int how)
2430 {
2431 	struct inet6_dev *idev;
2432 	struct inet6_ifaddr *ifa, **bifa;
2433 	int i;
2434 
2435 	ASSERT_RTNL();
2436 
2437 	if (dev == init_net.loopback_dev && how == 1)
2438 		how = 0;
2439 
2440 	rt6_ifdown(dev);
2441 	neigh_ifdown(&nd_tbl, dev);
2442 
2443 	idev = __in6_dev_get(dev);
2444 	if (idev == NULL)
2445 		return -ENODEV;
2446 
2447 	/* Step 1: remove reference to ipv6 device from parent device.
2448 		   Do not dev_put!
2449 	 */
2450 	if (how == 1) {
2451 		idev->dead = 1;
2452 
2453 		/* protected by rtnl_lock */
2454 		rcu_assign_pointer(dev->ip6_ptr, NULL);
2455 
2456 		/* Step 1.5: remove snmp6 entry */
2457 		snmp6_unregister_dev(idev);
2458 
2459 	}
2460 
2461 	/* Step 2: clear hash table */
2462 	for (i=0; i<IN6_ADDR_HSIZE; i++) {
2463 		bifa = &inet6_addr_lst[i];
2464 
2465 		write_lock_bh(&addrconf_hash_lock);
2466 		while ((ifa = *bifa) != NULL) {
2467 			if (ifa->idev == idev) {
2468 				*bifa = ifa->lst_next;
2469 				ifa->lst_next = NULL;
2470 				addrconf_del_timer(ifa);
2471 				in6_ifa_put(ifa);
2472 				continue;
2473 			}
2474 			bifa = &ifa->lst_next;
2475 		}
2476 		write_unlock_bh(&addrconf_hash_lock);
2477 	}
2478 
2479 	write_lock_bh(&idev->lock);
2480 
2481 	/* Step 3: clear flags for stateless addrconf */
2482 	if (how != 1)
2483 		idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2484 
2485 	/* Step 4: clear address list */
2486 #ifdef CONFIG_IPV6_PRIVACY
2487 	if (how == 1 && del_timer(&idev->regen_timer))
2488 		in6_dev_put(idev);
2489 
2490 	/* clear tempaddr list */
2491 	while ((ifa = idev->tempaddr_list) != NULL) {
2492 		idev->tempaddr_list = ifa->tmp_next;
2493 		ifa->tmp_next = NULL;
2494 		ifa->dead = 1;
2495 		write_unlock_bh(&idev->lock);
2496 		spin_lock_bh(&ifa->lock);
2497 
2498 		if (ifa->ifpub) {
2499 			in6_ifa_put(ifa->ifpub);
2500 			ifa->ifpub = NULL;
2501 		}
2502 		spin_unlock_bh(&ifa->lock);
2503 		in6_ifa_put(ifa);
2504 		write_lock_bh(&idev->lock);
2505 	}
2506 #endif
2507 	while ((ifa = idev->addr_list) != NULL) {
2508 		idev->addr_list = ifa->if_next;
2509 		ifa->if_next = NULL;
2510 		ifa->dead = 1;
2511 		addrconf_del_timer(ifa);
2512 		write_unlock_bh(&idev->lock);
2513 
2514 		__ipv6_ifa_notify(RTM_DELADDR, ifa);
2515 		atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2516 		in6_ifa_put(ifa);
2517 
2518 		write_lock_bh(&idev->lock);
2519 	}
2520 	write_unlock_bh(&idev->lock);
2521 
2522 	/* Step 5: Discard multicast list */
2523 
2524 	if (how == 1)
2525 		ipv6_mc_destroy_dev(idev);
2526 	else
2527 		ipv6_mc_down(idev);
2528 
2529 	idev->tstamp = jiffies;
2530 
2531 	/* Shot the device (if unregistered) */
2532 
2533 	if (how == 1) {
2534 		addrconf_sysctl_unregister(idev);
2535 		neigh_parms_release(&nd_tbl, idev->nd_parms);
2536 		neigh_ifdown(&nd_tbl, dev);
2537 		in6_dev_put(idev);
2538 	}
2539 	return 0;
2540 }
2541 
2542 static void addrconf_rs_timer(unsigned long data)
2543 {
2544 	struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2545 
2546 	if (ifp->idev->cnf.forwarding)
2547 		goto out;
2548 
2549 	if (ifp->idev->if_flags & IF_RA_RCVD) {
2550 		/*
2551 		 *	Announcement received after solicitation
2552 		 *	was sent
2553 		 */
2554 		goto out;
2555 	}
2556 
2557 	spin_lock(&ifp->lock);
2558 	if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2559 		struct in6_addr all_routers;
2560 
2561 		/* The wait after the last probe can be shorter */
2562 		addrconf_mod_timer(ifp, AC_RS,
2563 				   (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2564 				   ifp->idev->cnf.rtr_solicit_delay :
2565 				   ifp->idev->cnf.rtr_solicit_interval);
2566 		spin_unlock(&ifp->lock);
2567 
2568 		ipv6_addr_all_routers(&all_routers);
2569 
2570 		ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2571 	} else {
2572 		spin_unlock(&ifp->lock);
2573 		/*
2574 		 * Note: we do not support deprecated "all on-link"
2575 		 * assumption any longer.
2576 		 */
2577 		printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2578 		       ifp->idev->dev->name);
2579 	}
2580 
2581 out:
2582 	in6_ifa_put(ifp);
2583 }
2584 
2585 /*
2586  *	Duplicate Address Detection
2587  */
2588 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2589 {
2590 	unsigned long rand_num;
2591 	struct inet6_dev *idev = ifp->idev;
2592 
2593 	if (ifp->flags & IFA_F_OPTIMISTIC)
2594 		rand_num = 0;
2595 	else
2596 		rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2597 
2598 	ifp->probes = idev->cnf.dad_transmits;
2599 	addrconf_mod_timer(ifp, AC_DAD, rand_num);
2600 }
2601 
2602 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2603 {
2604 	struct inet6_dev *idev = ifp->idev;
2605 	struct net_device *dev = idev->dev;
2606 
2607 	addrconf_join_solict(dev, &ifp->addr);
2608 
2609 	net_srandom(ifp->addr.s6_addr32[3]);
2610 
2611 	read_lock_bh(&idev->lock);
2612 	if (ifp->dead)
2613 		goto out;
2614 	spin_lock_bh(&ifp->lock);
2615 
2616 	if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2617 	    !(ifp->flags&IFA_F_TENTATIVE) ||
2618 	    ifp->flags & IFA_F_NODAD) {
2619 		ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
2620 		spin_unlock_bh(&ifp->lock);
2621 		read_unlock_bh(&idev->lock);
2622 
2623 		addrconf_dad_completed(ifp);
2624 		return;
2625 	}
2626 
2627 	if (!(idev->if_flags & IF_READY)) {
2628 		spin_unlock_bh(&ifp->lock);
2629 		read_unlock_bh(&idev->lock);
2630 		/*
2631 		 * If the defice is not ready:
2632 		 * - keep it tentative if it is a permanent address.
2633 		 * - otherwise, kill it.
2634 		 */
2635 		in6_ifa_hold(ifp);
2636 		addrconf_dad_stop(ifp);
2637 		return;
2638 	}
2639 
2640 	/*
2641 	 * Optimistic nodes can start receiving
2642 	 * Frames right away
2643 	 */
2644 	if(ifp->flags & IFA_F_OPTIMISTIC)
2645 		ip6_ins_rt(ifp->rt);
2646 
2647 	addrconf_dad_kick(ifp);
2648 	spin_unlock_bh(&ifp->lock);
2649 out:
2650 	read_unlock_bh(&idev->lock);
2651 }
2652 
2653 static void addrconf_dad_timer(unsigned long data)
2654 {
2655 	struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2656 	struct inet6_dev *idev = ifp->idev;
2657 	struct in6_addr unspec;
2658 	struct in6_addr mcaddr;
2659 
2660 	read_lock_bh(&idev->lock);
2661 	if (idev->dead) {
2662 		read_unlock_bh(&idev->lock);
2663 		goto out;
2664 	}
2665 	spin_lock_bh(&ifp->lock);
2666 	if (ifp->probes == 0) {
2667 		/*
2668 		 * DAD was successful
2669 		 */
2670 
2671 		ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
2672 		spin_unlock_bh(&ifp->lock);
2673 		read_unlock_bh(&idev->lock);
2674 
2675 		addrconf_dad_completed(ifp);
2676 
2677 		goto out;
2678 	}
2679 
2680 	ifp->probes--;
2681 	addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2682 	spin_unlock_bh(&ifp->lock);
2683 	read_unlock_bh(&idev->lock);
2684 
2685 	/* send a neighbour solicitation for our addr */
2686 	memset(&unspec, 0, sizeof(unspec));
2687 	addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2688 	ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec);
2689 out:
2690 	in6_ifa_put(ifp);
2691 }
2692 
2693 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2694 {
2695 	struct net_device *	dev = ifp->idev->dev;
2696 
2697 	/*
2698 	 *	Configure the address for reception. Now it is valid.
2699 	 */
2700 
2701 	ipv6_ifa_notify(RTM_NEWADDR, ifp);
2702 
2703 	/* If added prefix is link local and forwarding is off,
2704 	   start sending router solicitations.
2705 	 */
2706 
2707 	if (ifp->idev->cnf.forwarding == 0 &&
2708 	    ifp->idev->cnf.rtr_solicits > 0 &&
2709 	    (dev->flags&IFF_LOOPBACK) == 0 &&
2710 	    (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2711 		struct in6_addr all_routers;
2712 
2713 		ipv6_addr_all_routers(&all_routers);
2714 
2715 		/*
2716 		 *	If a host as already performed a random delay
2717 		 *	[...] as part of DAD [...] there is no need
2718 		 *	to delay again before sending the first RS
2719 		 */
2720 		ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2721 
2722 		spin_lock_bh(&ifp->lock);
2723 		ifp->probes = 1;
2724 		ifp->idev->if_flags |= IF_RS_SENT;
2725 		addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2726 		spin_unlock_bh(&ifp->lock);
2727 	}
2728 }
2729 
2730 static void addrconf_dad_run(struct inet6_dev *idev) {
2731 	struct inet6_ifaddr *ifp;
2732 
2733 	read_lock_bh(&idev->lock);
2734 	for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2735 		spin_lock_bh(&ifp->lock);
2736 		if (!(ifp->flags & IFA_F_TENTATIVE)) {
2737 			spin_unlock_bh(&ifp->lock);
2738 			continue;
2739 		}
2740 		spin_unlock_bh(&ifp->lock);
2741 		addrconf_dad_kick(ifp);
2742 	}
2743 	read_unlock_bh(&idev->lock);
2744 }
2745 
2746 #ifdef CONFIG_PROC_FS
2747 struct if6_iter_state {
2748 	struct seq_net_private p;
2749 	int bucket;
2750 };
2751 
2752 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2753 {
2754 	struct inet6_ifaddr *ifa = NULL;
2755 	struct if6_iter_state *state = seq->private;
2756 	struct net *net = state->p.net;
2757 
2758 	for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2759 		ifa = inet6_addr_lst[state->bucket];
2760 
2761 		while (ifa && ifa->idev->dev->nd_net != net)
2762 			ifa = ifa->lst_next;
2763 		if (ifa)
2764 			break;
2765 	}
2766 	return ifa;
2767 }
2768 
2769 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2770 {
2771 	struct if6_iter_state *state = seq->private;
2772 	struct net *net = state->p.net;
2773 
2774 	ifa = ifa->lst_next;
2775 try_again:
2776 	if (ifa) {
2777 		if (ifa->idev->dev->nd_net != net) {
2778 			ifa = ifa->lst_next;
2779 			goto try_again;
2780 		}
2781 	}
2782 
2783 	if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2784 		ifa = inet6_addr_lst[state->bucket];
2785 		goto try_again;
2786 	}
2787 
2788 	return ifa;
2789 }
2790 
2791 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2792 {
2793 	struct inet6_ifaddr *ifa = if6_get_first(seq);
2794 
2795 	if (ifa)
2796 		while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2797 			--pos;
2798 	return pos ? NULL : ifa;
2799 }
2800 
2801 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2802 	__acquires(addrconf_hash_lock)
2803 {
2804 	read_lock_bh(&addrconf_hash_lock);
2805 	return if6_get_idx(seq, *pos);
2806 }
2807 
2808 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2809 {
2810 	struct inet6_ifaddr *ifa;
2811 
2812 	ifa = if6_get_next(seq, v);
2813 	++*pos;
2814 	return ifa;
2815 }
2816 
2817 static void if6_seq_stop(struct seq_file *seq, void *v)
2818 	__releases(addrconf_hash_lock)
2819 {
2820 	read_unlock_bh(&addrconf_hash_lock);
2821 }
2822 
2823 static int if6_seq_show(struct seq_file *seq, void *v)
2824 {
2825 	struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2826 	seq_printf(seq,
2827 		   NIP6_SEQFMT " %02x %02x %02x %02x %8s\n",
2828 		   NIP6(ifp->addr),
2829 		   ifp->idev->dev->ifindex,
2830 		   ifp->prefix_len,
2831 		   ifp->scope,
2832 		   ifp->flags,
2833 		   ifp->idev->dev->name);
2834 	return 0;
2835 }
2836 
2837 static const struct seq_operations if6_seq_ops = {
2838 	.start	= if6_seq_start,
2839 	.next	= if6_seq_next,
2840 	.show	= if6_seq_show,
2841 	.stop	= if6_seq_stop,
2842 };
2843 
2844 static int if6_seq_open(struct inode *inode, struct file *file)
2845 {
2846 	return seq_open_net(inode, file, &if6_seq_ops,
2847 			    sizeof(struct if6_iter_state));
2848 }
2849 
2850 static const struct file_operations if6_fops = {
2851 	.owner		= THIS_MODULE,
2852 	.open		= if6_seq_open,
2853 	.read		= seq_read,
2854 	.llseek		= seq_lseek,
2855 	.release	= seq_release_net,
2856 };
2857 
2858 static int if6_proc_net_init(struct net *net)
2859 {
2860 	if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
2861 		return -ENOMEM;
2862 	return 0;
2863 }
2864 
2865 static void if6_proc_net_exit(struct net *net)
2866 {
2867        proc_net_remove(net, "if_inet6");
2868 }
2869 
2870 static struct pernet_operations if6_proc_net_ops = {
2871        .init = if6_proc_net_init,
2872        .exit = if6_proc_net_exit,
2873 };
2874 
2875 int __init if6_proc_init(void)
2876 {
2877 	return register_pernet_subsys(&if6_proc_net_ops);
2878 }
2879 
2880 void if6_proc_exit(void)
2881 {
2882 	unregister_pernet_subsys(&if6_proc_net_ops);
2883 }
2884 #endif	/* CONFIG_PROC_FS */
2885 
2886 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
2887 /* Check if address is a home address configured on any interface. */
2888 int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr)
2889 {
2890 	int ret = 0;
2891 	struct inet6_ifaddr * ifp;
2892 	u8 hash = ipv6_addr_hash(addr);
2893 	read_lock_bh(&addrconf_hash_lock);
2894 	for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) {
2895 		if (ifp->idev->dev->nd_net != net)
2896 			continue;
2897 		if (ipv6_addr_cmp(&ifp->addr, addr) == 0 &&
2898 		    (ifp->flags & IFA_F_HOMEADDRESS)) {
2899 			ret = 1;
2900 			break;
2901 		}
2902 	}
2903 	read_unlock_bh(&addrconf_hash_lock);
2904 	return ret;
2905 }
2906 #endif
2907 
2908 /*
2909  *	Periodic address status verification
2910  */
2911 
2912 static void addrconf_verify(unsigned long foo)
2913 {
2914 	struct inet6_ifaddr *ifp;
2915 	unsigned long now, next;
2916 	int i;
2917 
2918 	spin_lock_bh(&addrconf_verify_lock);
2919 	now = jiffies;
2920 	next = now + ADDR_CHECK_FREQUENCY;
2921 
2922 	del_timer(&addr_chk_timer);
2923 
2924 	for (i=0; i < IN6_ADDR_HSIZE; i++) {
2925 
2926 restart:
2927 		read_lock(&addrconf_hash_lock);
2928 		for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
2929 			unsigned long age;
2930 #ifdef CONFIG_IPV6_PRIVACY
2931 			unsigned long regen_advance;
2932 #endif
2933 
2934 			if (ifp->flags & IFA_F_PERMANENT)
2935 				continue;
2936 
2937 			spin_lock(&ifp->lock);
2938 			age = (now - ifp->tstamp) / HZ;
2939 
2940 #ifdef CONFIG_IPV6_PRIVACY
2941 			regen_advance = ifp->idev->cnf.regen_max_retry *
2942 					ifp->idev->cnf.dad_transmits *
2943 					ifp->idev->nd_parms->retrans_time / HZ;
2944 #endif
2945 
2946 			if (ifp->valid_lft != INFINITY_LIFE_TIME &&
2947 			    age >= ifp->valid_lft) {
2948 				spin_unlock(&ifp->lock);
2949 				in6_ifa_hold(ifp);
2950 				read_unlock(&addrconf_hash_lock);
2951 				ipv6_del_addr(ifp);
2952 				goto restart;
2953 			} else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
2954 				spin_unlock(&ifp->lock);
2955 				continue;
2956 			} else if (age >= ifp->prefered_lft) {
2957 				/* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
2958 				int deprecate = 0;
2959 
2960 				if (!(ifp->flags&IFA_F_DEPRECATED)) {
2961 					deprecate = 1;
2962 					ifp->flags |= IFA_F_DEPRECATED;
2963 				}
2964 
2965 				if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
2966 					next = ifp->tstamp + ifp->valid_lft * HZ;
2967 
2968 				spin_unlock(&ifp->lock);
2969 
2970 				if (deprecate) {
2971 					in6_ifa_hold(ifp);
2972 					read_unlock(&addrconf_hash_lock);
2973 
2974 					ipv6_ifa_notify(0, ifp);
2975 					in6_ifa_put(ifp);
2976 					goto restart;
2977 				}
2978 #ifdef CONFIG_IPV6_PRIVACY
2979 			} else if ((ifp->flags&IFA_F_TEMPORARY) &&
2980 				   !(ifp->flags&IFA_F_TENTATIVE)) {
2981 				if (age >= ifp->prefered_lft - regen_advance) {
2982 					struct inet6_ifaddr *ifpub = ifp->ifpub;
2983 					if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2984 						next = ifp->tstamp + ifp->prefered_lft * HZ;
2985 					if (!ifp->regen_count && ifpub) {
2986 						ifp->regen_count++;
2987 						in6_ifa_hold(ifp);
2988 						in6_ifa_hold(ifpub);
2989 						spin_unlock(&ifp->lock);
2990 						read_unlock(&addrconf_hash_lock);
2991 						spin_lock(&ifpub->lock);
2992 						ifpub->regen_count = 0;
2993 						spin_unlock(&ifpub->lock);
2994 						ipv6_create_tempaddr(ifpub, ifp);
2995 						in6_ifa_put(ifpub);
2996 						in6_ifa_put(ifp);
2997 						goto restart;
2998 					}
2999 				} else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3000 					next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3001 				spin_unlock(&ifp->lock);
3002 #endif
3003 			} else {
3004 				/* ifp->prefered_lft <= ifp->valid_lft */
3005 				if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3006 					next = ifp->tstamp + ifp->prefered_lft * HZ;
3007 				spin_unlock(&ifp->lock);
3008 			}
3009 		}
3010 		read_unlock(&addrconf_hash_lock);
3011 	}
3012 
3013 	addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
3014 	add_timer(&addr_chk_timer);
3015 	spin_unlock_bh(&addrconf_verify_lock);
3016 }
3017 
3018 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3019 {
3020 	struct in6_addr *pfx = NULL;
3021 
3022 	if (addr)
3023 		pfx = nla_data(addr);
3024 
3025 	if (local) {
3026 		if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3027 			pfx = NULL;
3028 		else
3029 			pfx = nla_data(local);
3030 	}
3031 
3032 	return pfx;
3033 }
3034 
3035 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3036 	[IFA_ADDRESS]		= { .len = sizeof(struct in6_addr) },
3037 	[IFA_LOCAL]		= { .len = sizeof(struct in6_addr) },
3038 	[IFA_CACHEINFO]		= { .len = sizeof(struct ifa_cacheinfo) },
3039 };
3040 
3041 static int
3042 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3043 {
3044 	struct net *net = skb->sk->sk_net;
3045 	struct ifaddrmsg *ifm;
3046 	struct nlattr *tb[IFA_MAX+1];
3047 	struct in6_addr *pfx;
3048 	int err;
3049 
3050 	if (net != &init_net)
3051 		return -EINVAL;
3052 
3053 	err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3054 	if (err < 0)
3055 		return err;
3056 
3057 	ifm = nlmsg_data(nlh);
3058 	pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3059 	if (pfx == NULL)
3060 		return -EINVAL;
3061 
3062 	return inet6_addr_del(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3063 }
3064 
3065 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3066 			     u32 prefered_lft, u32 valid_lft)
3067 {
3068 	u32 flags = RTF_EXPIRES;
3069 
3070 	if (!valid_lft || (prefered_lft > valid_lft))
3071 		return -EINVAL;
3072 
3073 	if (valid_lft == INFINITY_LIFE_TIME) {
3074 		ifa_flags |= IFA_F_PERMANENT;
3075 		flags = 0;
3076 	} else if (valid_lft >= 0x7FFFFFFF/HZ)
3077 		valid_lft = 0x7FFFFFFF/HZ;
3078 
3079 	if (prefered_lft == 0)
3080 		ifa_flags |= IFA_F_DEPRECATED;
3081 	else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
3082 		 (prefered_lft != INFINITY_LIFE_TIME))
3083 		prefered_lft = 0x7FFFFFFF/HZ;
3084 
3085 	spin_lock_bh(&ifp->lock);
3086 	ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3087 	ifp->tstamp = jiffies;
3088 	ifp->valid_lft = valid_lft;
3089 	ifp->prefered_lft = prefered_lft;
3090 
3091 	spin_unlock_bh(&ifp->lock);
3092 	if (!(ifp->flags&IFA_F_TENTATIVE))
3093 		ipv6_ifa_notify(0, ifp);
3094 
3095 	addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3096 			      jiffies_to_clock_t(valid_lft * HZ), flags);
3097 	addrconf_verify(0);
3098 
3099 	return 0;
3100 }
3101 
3102 static int
3103 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3104 {
3105 	struct net *net = skb->sk->sk_net;
3106 	struct ifaddrmsg *ifm;
3107 	struct nlattr *tb[IFA_MAX+1];
3108 	struct in6_addr *pfx;
3109 	struct inet6_ifaddr *ifa;
3110 	struct net_device *dev;
3111 	u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3112 	u8 ifa_flags;
3113 	int err;
3114 
3115 	if (net != &init_net)
3116 		return -EINVAL;
3117 
3118 	err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3119 	if (err < 0)
3120 		return err;
3121 
3122 	ifm = nlmsg_data(nlh);
3123 	pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3124 	if (pfx == NULL)
3125 		return -EINVAL;
3126 
3127 	if (tb[IFA_CACHEINFO]) {
3128 		struct ifa_cacheinfo *ci;
3129 
3130 		ci = nla_data(tb[IFA_CACHEINFO]);
3131 		valid_lft = ci->ifa_valid;
3132 		preferred_lft = ci->ifa_prefered;
3133 	} else {
3134 		preferred_lft = INFINITY_LIFE_TIME;
3135 		valid_lft = INFINITY_LIFE_TIME;
3136 	}
3137 
3138 	dev =  __dev_get_by_index(&init_net, ifm->ifa_index);
3139 	if (dev == NULL)
3140 		return -ENODEV;
3141 
3142 	/* We ignore other flags so far. */
3143 	ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3144 
3145 	ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3146 	if (ifa == NULL) {
3147 		/*
3148 		 * It would be best to check for !NLM_F_CREATE here but
3149 		 * userspace alreay relies on not having to provide this.
3150 		 */
3151 		return inet6_addr_add(ifm->ifa_index, pfx, ifm->ifa_prefixlen,
3152 				      ifa_flags, preferred_lft, valid_lft);
3153 	}
3154 
3155 	if (nlh->nlmsg_flags & NLM_F_EXCL ||
3156 	    !(nlh->nlmsg_flags & NLM_F_REPLACE))
3157 		err = -EEXIST;
3158 	else
3159 		err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3160 
3161 	in6_ifa_put(ifa);
3162 
3163 	return err;
3164 }
3165 
3166 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3167 			  u8 scope, int ifindex)
3168 {
3169 	struct ifaddrmsg *ifm;
3170 
3171 	ifm = nlmsg_data(nlh);
3172 	ifm->ifa_family = AF_INET6;
3173 	ifm->ifa_prefixlen = prefixlen;
3174 	ifm->ifa_flags = flags;
3175 	ifm->ifa_scope = scope;
3176 	ifm->ifa_index = ifindex;
3177 }
3178 
3179 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3180 			 unsigned long tstamp, u32 preferred, u32 valid)
3181 {
3182 	struct ifa_cacheinfo ci;
3183 
3184 	ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3185 			+ TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3186 	ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3187 			+ TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3188 	ci.ifa_prefered = preferred;
3189 	ci.ifa_valid = valid;
3190 
3191 	return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3192 }
3193 
3194 static inline int rt_scope(int ifa_scope)
3195 {
3196 	if (ifa_scope & IFA_HOST)
3197 		return RT_SCOPE_HOST;
3198 	else if (ifa_scope & IFA_LINK)
3199 		return RT_SCOPE_LINK;
3200 	else if (ifa_scope & IFA_SITE)
3201 		return RT_SCOPE_SITE;
3202 	else
3203 		return RT_SCOPE_UNIVERSE;
3204 }
3205 
3206 static inline int inet6_ifaddr_msgsize(void)
3207 {
3208 	return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3209 	       + nla_total_size(16) /* IFA_ADDRESS */
3210 	       + nla_total_size(sizeof(struct ifa_cacheinfo));
3211 }
3212 
3213 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3214 			     u32 pid, u32 seq, int event, unsigned int flags)
3215 {
3216 	struct nlmsghdr  *nlh;
3217 	u32 preferred, valid;
3218 
3219 	nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3220 	if (nlh == NULL)
3221 		return -EMSGSIZE;
3222 
3223 	put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3224 		      ifa->idev->dev->ifindex);
3225 
3226 	if (!(ifa->flags&IFA_F_PERMANENT)) {
3227 		preferred = ifa->prefered_lft;
3228 		valid = ifa->valid_lft;
3229 		if (preferred != INFINITY_LIFE_TIME) {
3230 			long tval = (jiffies - ifa->tstamp)/HZ;
3231 			preferred -= tval;
3232 			if (valid != INFINITY_LIFE_TIME)
3233 				valid -= tval;
3234 		}
3235 	} else {
3236 		preferred = INFINITY_LIFE_TIME;
3237 		valid = INFINITY_LIFE_TIME;
3238 	}
3239 
3240 	if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3241 	    put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3242 		nlmsg_cancel(skb, nlh);
3243 		return -EMSGSIZE;
3244 	}
3245 
3246 	return nlmsg_end(skb, nlh);
3247 }
3248 
3249 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3250 				u32 pid, u32 seq, int event, u16 flags)
3251 {
3252 	struct nlmsghdr  *nlh;
3253 	u8 scope = RT_SCOPE_UNIVERSE;
3254 	int ifindex = ifmca->idev->dev->ifindex;
3255 
3256 	if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3257 		scope = RT_SCOPE_SITE;
3258 
3259 	nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3260 	if (nlh == NULL)
3261 		return -EMSGSIZE;
3262 
3263 	put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3264 	if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3265 	    put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3266 			  INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3267 		nlmsg_cancel(skb, nlh);
3268 		return -EMSGSIZE;
3269 	}
3270 
3271 	return nlmsg_end(skb, nlh);
3272 }
3273 
3274 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3275 				u32 pid, u32 seq, int event, unsigned int flags)
3276 {
3277 	struct nlmsghdr  *nlh;
3278 	u8 scope = RT_SCOPE_UNIVERSE;
3279 	int ifindex = ifaca->aca_idev->dev->ifindex;
3280 
3281 	if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3282 		scope = RT_SCOPE_SITE;
3283 
3284 	nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3285 	if (nlh == NULL)
3286 		return -EMSGSIZE;
3287 
3288 	put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3289 	if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3290 	    put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3291 			  INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3292 		nlmsg_cancel(skb, nlh);
3293 		return -EMSGSIZE;
3294 	}
3295 
3296 	return nlmsg_end(skb, nlh);
3297 }
3298 
3299 enum addr_type_t
3300 {
3301 	UNICAST_ADDR,
3302 	MULTICAST_ADDR,
3303 	ANYCAST_ADDR,
3304 };
3305 
3306 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3307 			   enum addr_type_t type)
3308 {
3309 	int idx, ip_idx;
3310 	int s_idx, s_ip_idx;
3311 	int err = 1;
3312 	struct net_device *dev;
3313 	struct inet6_dev *idev = NULL;
3314 	struct inet6_ifaddr *ifa;
3315 	struct ifmcaddr6 *ifmca;
3316 	struct ifacaddr6 *ifaca;
3317 
3318 	s_idx = cb->args[0];
3319 	s_ip_idx = ip_idx = cb->args[1];
3320 
3321 	idx = 0;
3322 	for_each_netdev(&init_net, dev) {
3323 		if (idx < s_idx)
3324 			goto cont;
3325 		if (idx > s_idx)
3326 			s_ip_idx = 0;
3327 		ip_idx = 0;
3328 		if ((idev = in6_dev_get(dev)) == NULL)
3329 			goto cont;
3330 		read_lock_bh(&idev->lock);
3331 		switch (type) {
3332 		case UNICAST_ADDR:
3333 			/* unicast address incl. temp addr */
3334 			for (ifa = idev->addr_list; ifa;
3335 			     ifa = ifa->if_next, ip_idx++) {
3336 				if (ip_idx < s_ip_idx)
3337 					continue;
3338 				err = inet6_fill_ifaddr(skb, ifa,
3339 							NETLINK_CB(cb->skb).pid,
3340 							cb->nlh->nlmsg_seq,
3341 							RTM_NEWADDR,
3342 							NLM_F_MULTI);
3343 			}
3344 			break;
3345 		case MULTICAST_ADDR:
3346 			/* multicast address */
3347 			for (ifmca = idev->mc_list; ifmca;
3348 			     ifmca = ifmca->next, ip_idx++) {
3349 				if (ip_idx < s_ip_idx)
3350 					continue;
3351 				err = inet6_fill_ifmcaddr(skb, ifmca,
3352 							  NETLINK_CB(cb->skb).pid,
3353 							  cb->nlh->nlmsg_seq,
3354 							  RTM_GETMULTICAST,
3355 							  NLM_F_MULTI);
3356 			}
3357 			break;
3358 		case ANYCAST_ADDR:
3359 			/* anycast address */
3360 			for (ifaca = idev->ac_list; ifaca;
3361 			     ifaca = ifaca->aca_next, ip_idx++) {
3362 				if (ip_idx < s_ip_idx)
3363 					continue;
3364 				err = inet6_fill_ifacaddr(skb, ifaca,
3365 							  NETLINK_CB(cb->skb).pid,
3366 							  cb->nlh->nlmsg_seq,
3367 							  RTM_GETANYCAST,
3368 							  NLM_F_MULTI);
3369 			}
3370 			break;
3371 		default:
3372 			break;
3373 		}
3374 		read_unlock_bh(&idev->lock);
3375 		in6_dev_put(idev);
3376 
3377 		if (err <= 0)
3378 			break;
3379 cont:
3380 		idx++;
3381 	}
3382 	cb->args[0] = idx;
3383 	cb->args[1] = ip_idx;
3384 	return skb->len;
3385 }
3386 
3387 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3388 {
3389 	struct net *net = skb->sk->sk_net;
3390 	enum addr_type_t type = UNICAST_ADDR;
3391 
3392 	if (net != &init_net)
3393 		return 0;
3394 
3395 	return inet6_dump_addr(skb, cb, type);
3396 }
3397 
3398 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3399 {
3400 	struct net *net = skb->sk->sk_net;
3401 	enum addr_type_t type = MULTICAST_ADDR;
3402 
3403 	if (net != &init_net)
3404 		return 0;
3405 
3406 	return inet6_dump_addr(skb, cb, type);
3407 }
3408 
3409 
3410 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3411 {
3412 	struct net *net = skb->sk->sk_net;
3413 	enum addr_type_t type = ANYCAST_ADDR;
3414 
3415 	if (net != &init_net)
3416 		return 0;
3417 
3418 	return inet6_dump_addr(skb, cb, type);
3419 }
3420 
3421 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3422 			     void *arg)
3423 {
3424 	struct net *net = in_skb->sk->sk_net;
3425 	struct ifaddrmsg *ifm;
3426 	struct nlattr *tb[IFA_MAX+1];
3427 	struct in6_addr *addr = NULL;
3428 	struct net_device *dev = NULL;
3429 	struct inet6_ifaddr *ifa;
3430 	struct sk_buff *skb;
3431 	int err;
3432 
3433 	if (net != &init_net)
3434 		return -EINVAL;
3435 
3436 	err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3437 	if (err < 0)
3438 		goto errout;
3439 
3440 	addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3441 	if (addr == NULL) {
3442 		err = -EINVAL;
3443 		goto errout;
3444 	}
3445 
3446 	ifm = nlmsg_data(nlh);
3447 	if (ifm->ifa_index)
3448 		dev = __dev_get_by_index(&init_net, ifm->ifa_index);
3449 
3450 	if ((ifa = ipv6_get_ifaddr(net, addr, dev, 1)) == NULL) {
3451 		err = -EADDRNOTAVAIL;
3452 		goto errout;
3453 	}
3454 
3455 	if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) {
3456 		err = -ENOBUFS;
3457 		goto errout_ifa;
3458 	}
3459 
3460 	err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3461 				nlh->nlmsg_seq, RTM_NEWADDR, 0);
3462 	if (err < 0) {
3463 		/* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3464 		WARN_ON(err == -EMSGSIZE);
3465 		kfree_skb(skb);
3466 		goto errout_ifa;
3467 	}
3468 	err = rtnl_unicast(skb, &init_net, NETLINK_CB(in_skb).pid);
3469 errout_ifa:
3470 	in6_ifa_put(ifa);
3471 errout:
3472 	return err;
3473 }
3474 
3475 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3476 {
3477 	struct sk_buff *skb;
3478 	int err = -ENOBUFS;
3479 
3480 	skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3481 	if (skb == NULL)
3482 		goto errout;
3483 
3484 	err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3485 	if (err < 0) {
3486 		/* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3487 		WARN_ON(err == -EMSGSIZE);
3488 		kfree_skb(skb);
3489 		goto errout;
3490 	}
3491 	err = rtnl_notify(skb, &init_net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3492 errout:
3493 	if (err < 0)
3494 		rtnl_set_sk_err(&init_net, RTNLGRP_IPV6_IFADDR, err);
3495 }
3496 
3497 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3498 				__s32 *array, int bytes)
3499 {
3500 	BUG_ON(bytes < (DEVCONF_MAX * 4));
3501 
3502 	memset(array, 0, bytes);
3503 	array[DEVCONF_FORWARDING] = cnf->forwarding;
3504 	array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3505 	array[DEVCONF_MTU6] = cnf->mtu6;
3506 	array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3507 	array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3508 	array[DEVCONF_AUTOCONF] = cnf->autoconf;
3509 	array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3510 	array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3511 	array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3512 	array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3513 	array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3514 #ifdef CONFIG_IPV6_PRIVACY
3515 	array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3516 	array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3517 	array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3518 	array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3519 	array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3520 #endif
3521 	array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3522 	array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3523 	array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3524 #ifdef CONFIG_IPV6_ROUTER_PREF
3525 	array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3526 	array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
3527 #ifdef CONFIG_IPV6_ROUTE_INFO
3528 	array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3529 #endif
3530 #endif
3531 	array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3532 	array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3533 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3534 	array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3535 #endif
3536 }
3537 
3538 static inline size_t inet6_if_nlmsg_size(void)
3539 {
3540 	return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3541 	       + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3542 	       + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3543 	       + nla_total_size(4) /* IFLA_MTU */
3544 	       + nla_total_size(4) /* IFLA_LINK */
3545 	       + nla_total_size( /* IFLA_PROTINFO */
3546 			nla_total_size(4) /* IFLA_INET6_FLAGS */
3547 			+ nla_total_size(sizeof(struct ifla_cacheinfo))
3548 			+ nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3549 			+ nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3550 			+ nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
3551 		 );
3552 }
3553 
3554 static inline void __snmp6_fill_stats(u64 *stats, void **mib, int items,
3555 				      int bytes)
3556 {
3557 	int i;
3558 	int pad = bytes - sizeof(u64) * items;
3559 	BUG_ON(pad < 0);
3560 
3561 	/* Use put_unaligned() because stats may not be aligned for u64. */
3562 	put_unaligned(items, &stats[0]);
3563 	for (i = 1; i < items; i++)
3564 		put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3565 
3566 	memset(&stats[items], 0, pad);
3567 }
3568 
3569 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3570 			     int bytes)
3571 {
3572 	switch(attrtype) {
3573 	case IFLA_INET6_STATS:
3574 		__snmp6_fill_stats(stats, (void **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes);
3575 		break;
3576 	case IFLA_INET6_ICMP6STATS:
3577 		__snmp6_fill_stats(stats, (void **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
3578 		break;
3579 	}
3580 }
3581 
3582 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3583 			     u32 pid, u32 seq, int event, unsigned int flags)
3584 {
3585 	struct net_device *dev = idev->dev;
3586 	struct nlattr *nla;
3587 	struct ifinfomsg *hdr;
3588 	struct nlmsghdr *nlh;
3589 	void *protoinfo;
3590 	struct ifla_cacheinfo ci;
3591 
3592 	nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3593 	if (nlh == NULL)
3594 		return -EMSGSIZE;
3595 
3596 	hdr = nlmsg_data(nlh);
3597 	hdr->ifi_family = AF_INET6;
3598 	hdr->__ifi_pad = 0;
3599 	hdr->ifi_type = dev->type;
3600 	hdr->ifi_index = dev->ifindex;
3601 	hdr->ifi_flags = dev_get_flags(dev);
3602 	hdr->ifi_change = 0;
3603 
3604 	NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
3605 
3606 	if (dev->addr_len)
3607 		NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3608 
3609 	NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
3610 	if (dev->ifindex != dev->iflink)
3611 		NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
3612 
3613 	protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3614 	if (protoinfo == NULL)
3615 		goto nla_put_failure;
3616 
3617 	NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
3618 
3619 	ci.max_reasm_len = IPV6_MAXPLEN;
3620 	ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3621 		    + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3622 	ci.reachable_time = idev->nd_parms->reachable_time;
3623 	ci.retrans_time = idev->nd_parms->retrans_time;
3624 	NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3625 
3626 	nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3627 	if (nla == NULL)
3628 		goto nla_put_failure;
3629 	ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
3630 
3631 	/* XXX - MC not implemented */
3632 
3633 	nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3634 	if (nla == NULL)
3635 		goto nla_put_failure;
3636 	snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3637 
3638 	nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3639 	if (nla == NULL)
3640 		goto nla_put_failure;
3641 	snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
3642 
3643 	nla_nest_end(skb, protoinfo);
3644 	return nlmsg_end(skb, nlh);
3645 
3646 nla_put_failure:
3647 	nlmsg_cancel(skb, nlh);
3648 	return -EMSGSIZE;
3649 }
3650 
3651 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3652 {
3653 	struct net *net = skb->sk->sk_net;
3654 	int idx, err;
3655 	int s_idx = cb->args[0];
3656 	struct net_device *dev;
3657 	struct inet6_dev *idev;
3658 
3659 	if (net != &init_net)
3660 		return 0;
3661 
3662 	read_lock(&dev_base_lock);
3663 	idx = 0;
3664 	for_each_netdev(&init_net, dev) {
3665 		if (idx < s_idx)
3666 			goto cont;
3667 		if ((idev = in6_dev_get(dev)) == NULL)
3668 			goto cont;
3669 		err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
3670 				cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
3671 		in6_dev_put(idev);
3672 		if (err <= 0)
3673 			break;
3674 cont:
3675 		idx++;
3676 	}
3677 	read_unlock(&dev_base_lock);
3678 	cb->args[0] = idx;
3679 
3680 	return skb->len;
3681 }
3682 
3683 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3684 {
3685 	struct sk_buff *skb;
3686 	int err = -ENOBUFS;
3687 
3688 	skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
3689 	if (skb == NULL)
3690 		goto errout;
3691 
3692 	err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
3693 	if (err < 0) {
3694 		/* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3695 		WARN_ON(err == -EMSGSIZE);
3696 		kfree_skb(skb);
3697 		goto errout;
3698 	}
3699 	err = rtnl_notify(skb, &init_net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3700 errout:
3701 	if (err < 0)
3702 		rtnl_set_sk_err(&init_net, RTNLGRP_IPV6_IFADDR, err);
3703 }
3704 
3705 static inline size_t inet6_prefix_nlmsg_size(void)
3706 {
3707 	return NLMSG_ALIGN(sizeof(struct prefixmsg))
3708 	       + nla_total_size(sizeof(struct in6_addr))
3709 	       + nla_total_size(sizeof(struct prefix_cacheinfo));
3710 }
3711 
3712 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
3713 			     struct prefix_info *pinfo, u32 pid, u32 seq,
3714 			     int event, unsigned int flags)
3715 {
3716 	struct prefixmsg *pmsg;
3717 	struct nlmsghdr *nlh;
3718 	struct prefix_cacheinfo	ci;
3719 
3720 	nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
3721 	if (nlh == NULL)
3722 		return -EMSGSIZE;
3723 
3724 	pmsg = nlmsg_data(nlh);
3725 	pmsg->prefix_family = AF_INET6;
3726 	pmsg->prefix_pad1 = 0;
3727 	pmsg->prefix_pad2 = 0;
3728 	pmsg->prefix_ifindex = idev->dev->ifindex;
3729 	pmsg->prefix_len = pinfo->prefix_len;
3730 	pmsg->prefix_type = pinfo->type;
3731 	pmsg->prefix_pad3 = 0;
3732 	pmsg->prefix_flags = 0;
3733 	if (pinfo->onlink)
3734 		pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3735 	if (pinfo->autoconf)
3736 		pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3737 
3738 	NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
3739 
3740 	ci.preferred_time = ntohl(pinfo->prefered);
3741 	ci.valid_time = ntohl(pinfo->valid);
3742 	NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
3743 
3744 	return nlmsg_end(skb, nlh);
3745 
3746 nla_put_failure:
3747 	nlmsg_cancel(skb, nlh);
3748 	return -EMSGSIZE;
3749 }
3750 
3751 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
3752 			 struct prefix_info *pinfo)
3753 {
3754 	struct sk_buff *skb;
3755 	int err = -ENOBUFS;
3756 
3757 	skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
3758 	if (skb == NULL)
3759 		goto errout;
3760 
3761 	err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
3762 	if (err < 0) {
3763 		/* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
3764 		WARN_ON(err == -EMSGSIZE);
3765 		kfree_skb(skb);
3766 		goto errout;
3767 	}
3768 	err = rtnl_notify(skb, &init_net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
3769 errout:
3770 	if (err < 0)
3771 		rtnl_set_sk_err(&init_net, RTNLGRP_IPV6_PREFIX, err);
3772 }
3773 
3774 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3775 {
3776 	inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3777 
3778 	switch (event) {
3779 	case RTM_NEWADDR:
3780 		/*
3781 		 * If the address was optimistic
3782 		 * we inserted the route at the start of
3783 		 * our DAD process, so we don't need
3784 		 * to do it again
3785 		 */
3786 		if (!(ifp->rt->rt6i_node))
3787 			ip6_ins_rt(ifp->rt);
3788 		if (ifp->idev->cnf.forwarding)
3789 			addrconf_join_anycast(ifp);
3790 		break;
3791 	case RTM_DELADDR:
3792 		if (ifp->idev->cnf.forwarding)
3793 			addrconf_leave_anycast(ifp);
3794 		addrconf_leave_solict(ifp->idev, &ifp->addr);
3795 		dst_hold(&ifp->rt->u.dst);
3796 		if (ip6_del_rt(ifp->rt))
3797 			dst_free(&ifp->rt->u.dst);
3798 		break;
3799 	}
3800 }
3801 
3802 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3803 {
3804 	rcu_read_lock_bh();
3805 	if (likely(ifp->idev->dead == 0))
3806 		__ipv6_ifa_notify(event, ifp);
3807 	rcu_read_unlock_bh();
3808 }
3809 
3810 #ifdef CONFIG_SYSCTL
3811 
3812 static
3813 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3814 			   void __user *buffer, size_t *lenp, loff_t *ppos)
3815 {
3816 	int *valp = ctl->data;
3817 	int val = *valp;
3818 	int ret;
3819 
3820 	ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3821 
3822 	if (write)
3823 		addrconf_fixup_forwarding(ctl, valp, val);
3824 	return ret;
3825 }
3826 
3827 static int addrconf_sysctl_forward_strategy(ctl_table *table,
3828 					    int __user *name, int nlen,
3829 					    void __user *oldval,
3830 					    size_t __user *oldlenp,
3831 					    void __user *newval, size_t newlen)
3832 {
3833 	int *valp = table->data;
3834 	int val = *valp;
3835 	int new;
3836 
3837 	if (!newval || !newlen)
3838 		return 0;
3839 	if (newlen != sizeof(int))
3840 		return -EINVAL;
3841 	if (get_user(new, (int __user *)newval))
3842 		return -EFAULT;
3843 	if (new == *valp)
3844 		return 0;
3845 	if (oldval && oldlenp) {
3846 		size_t len;
3847 		if (get_user(len, oldlenp))
3848 			return -EFAULT;
3849 		if (len) {
3850 			if (len > table->maxlen)
3851 				len = table->maxlen;
3852 			if (copy_to_user(oldval, valp, len))
3853 				return -EFAULT;
3854 			if (put_user(len, oldlenp))
3855 				return -EFAULT;
3856 		}
3857 	}
3858 
3859 	*valp = new;
3860 	addrconf_fixup_forwarding(table, valp, val);
3861 	return 1;
3862 }
3863 
3864 static struct addrconf_sysctl_table
3865 {
3866 	struct ctl_table_header *sysctl_header;
3867 	ctl_table addrconf_vars[__NET_IPV6_MAX];
3868 	char *dev_name;
3869 } addrconf_sysctl __read_mostly = {
3870 	.sysctl_header = NULL,
3871 	.addrconf_vars = {
3872 		{
3873 			.ctl_name	=	NET_IPV6_FORWARDING,
3874 			.procname	=	"forwarding",
3875 			.data		=	&ipv6_devconf.forwarding,
3876 			.maxlen		=	sizeof(int),
3877 			.mode		=	0644,
3878 			.proc_handler	=	&addrconf_sysctl_forward,
3879 			.strategy	=	&addrconf_sysctl_forward_strategy,
3880 		},
3881 		{
3882 			.ctl_name	=	NET_IPV6_HOP_LIMIT,
3883 			.procname	=	"hop_limit",
3884 			.data		=	&ipv6_devconf.hop_limit,
3885 			.maxlen		=	sizeof(int),
3886 			.mode		=	0644,
3887 			.proc_handler	=	proc_dointvec,
3888 		},
3889 		{
3890 			.ctl_name	=	NET_IPV6_MTU,
3891 			.procname	=	"mtu",
3892 			.data		=	&ipv6_devconf.mtu6,
3893 			.maxlen		=	sizeof(int),
3894 			.mode		=	0644,
3895 			.proc_handler	=	&proc_dointvec,
3896 		},
3897 		{
3898 			.ctl_name	=	NET_IPV6_ACCEPT_RA,
3899 			.procname	=	"accept_ra",
3900 			.data		=	&ipv6_devconf.accept_ra,
3901 			.maxlen		=	sizeof(int),
3902 			.mode		=	0644,
3903 			.proc_handler	=	&proc_dointvec,
3904 		},
3905 		{
3906 			.ctl_name	=	NET_IPV6_ACCEPT_REDIRECTS,
3907 			.procname	=	"accept_redirects",
3908 			.data		=	&ipv6_devconf.accept_redirects,
3909 			.maxlen		=	sizeof(int),
3910 			.mode		=	0644,
3911 			.proc_handler	=	&proc_dointvec,
3912 		},
3913 		{
3914 			.ctl_name	=	NET_IPV6_AUTOCONF,
3915 			.procname	=	"autoconf",
3916 			.data		=	&ipv6_devconf.autoconf,
3917 			.maxlen		=	sizeof(int),
3918 			.mode		=	0644,
3919 			.proc_handler	=	&proc_dointvec,
3920 		},
3921 		{
3922 			.ctl_name	=	NET_IPV6_DAD_TRANSMITS,
3923 			.procname	=	"dad_transmits",
3924 			.data		=	&ipv6_devconf.dad_transmits,
3925 			.maxlen		=	sizeof(int),
3926 			.mode		=	0644,
3927 			.proc_handler	=	&proc_dointvec,
3928 		},
3929 		{
3930 			.ctl_name	=	NET_IPV6_RTR_SOLICITS,
3931 			.procname	=	"router_solicitations",
3932 			.data		=	&ipv6_devconf.rtr_solicits,
3933 			.maxlen		=	sizeof(int),
3934 			.mode		=	0644,
3935 			.proc_handler	=	&proc_dointvec,
3936 		},
3937 		{
3938 			.ctl_name	=	NET_IPV6_RTR_SOLICIT_INTERVAL,
3939 			.procname	=	"router_solicitation_interval",
3940 			.data		=	&ipv6_devconf.rtr_solicit_interval,
3941 			.maxlen		=	sizeof(int),
3942 			.mode		=	0644,
3943 			.proc_handler	=	&proc_dointvec_jiffies,
3944 			.strategy	=	&sysctl_jiffies,
3945 		},
3946 		{
3947 			.ctl_name	=	NET_IPV6_RTR_SOLICIT_DELAY,
3948 			.procname	=	"router_solicitation_delay",
3949 			.data		=	&ipv6_devconf.rtr_solicit_delay,
3950 			.maxlen		=	sizeof(int),
3951 			.mode		=	0644,
3952 			.proc_handler	=	&proc_dointvec_jiffies,
3953 			.strategy	=	&sysctl_jiffies,
3954 		},
3955 		{
3956 			.ctl_name	=	NET_IPV6_FORCE_MLD_VERSION,
3957 			.procname	=	"force_mld_version",
3958 			.data		=	&ipv6_devconf.force_mld_version,
3959 			.maxlen		=	sizeof(int),
3960 			.mode		=	0644,
3961 			.proc_handler	=	&proc_dointvec,
3962 		},
3963 #ifdef CONFIG_IPV6_PRIVACY
3964 		{
3965 			.ctl_name	=	NET_IPV6_USE_TEMPADDR,
3966 			.procname	=	"use_tempaddr",
3967 			.data		=	&ipv6_devconf.use_tempaddr,
3968 			.maxlen		=	sizeof(int),
3969 			.mode		=	0644,
3970 			.proc_handler	=	&proc_dointvec,
3971 		},
3972 		{
3973 			.ctl_name	=	NET_IPV6_TEMP_VALID_LFT,
3974 			.procname	=	"temp_valid_lft",
3975 			.data		=	&ipv6_devconf.temp_valid_lft,
3976 			.maxlen		=	sizeof(int),
3977 			.mode		=	0644,
3978 			.proc_handler	=	&proc_dointvec,
3979 		},
3980 		{
3981 			.ctl_name	=	NET_IPV6_TEMP_PREFERED_LFT,
3982 			.procname	=	"temp_prefered_lft",
3983 			.data		=	&ipv6_devconf.temp_prefered_lft,
3984 			.maxlen		=	sizeof(int),
3985 			.mode		=	0644,
3986 			.proc_handler	=	&proc_dointvec,
3987 		},
3988 		{
3989 			.ctl_name	=	NET_IPV6_REGEN_MAX_RETRY,
3990 			.procname	=	"regen_max_retry",
3991 			.data		=	&ipv6_devconf.regen_max_retry,
3992 			.maxlen		=	sizeof(int),
3993 			.mode		=	0644,
3994 			.proc_handler	=	&proc_dointvec,
3995 		},
3996 		{
3997 			.ctl_name	=	NET_IPV6_MAX_DESYNC_FACTOR,
3998 			.procname	=	"max_desync_factor",
3999 			.data		=	&ipv6_devconf.max_desync_factor,
4000 			.maxlen		=	sizeof(int),
4001 			.mode		=	0644,
4002 			.proc_handler	=	&proc_dointvec,
4003 		},
4004 #endif
4005 		{
4006 			.ctl_name	=	NET_IPV6_MAX_ADDRESSES,
4007 			.procname	=	"max_addresses",
4008 			.data		=	&ipv6_devconf.max_addresses,
4009 			.maxlen		=	sizeof(int),
4010 			.mode		=	0644,
4011 			.proc_handler	=	&proc_dointvec,
4012 		},
4013 		{
4014 			.ctl_name	=	NET_IPV6_ACCEPT_RA_DEFRTR,
4015 			.procname	=	"accept_ra_defrtr",
4016 			.data		=	&ipv6_devconf.accept_ra_defrtr,
4017 			.maxlen		=	sizeof(int),
4018 			.mode		=	0644,
4019 			.proc_handler	=	&proc_dointvec,
4020 		},
4021 		{
4022 			.ctl_name	=	NET_IPV6_ACCEPT_RA_PINFO,
4023 			.procname	=	"accept_ra_pinfo",
4024 			.data		=	&ipv6_devconf.accept_ra_pinfo,
4025 			.maxlen		=	sizeof(int),
4026 			.mode		=	0644,
4027 			.proc_handler	=	&proc_dointvec,
4028 		},
4029 #ifdef CONFIG_IPV6_ROUTER_PREF
4030 		{
4031 			.ctl_name	=	NET_IPV6_ACCEPT_RA_RTR_PREF,
4032 			.procname	=	"accept_ra_rtr_pref",
4033 			.data		=	&ipv6_devconf.accept_ra_rtr_pref,
4034 			.maxlen		=	sizeof(int),
4035 			.mode		=	0644,
4036 			.proc_handler	=	&proc_dointvec,
4037 		},
4038 		{
4039 			.ctl_name	=	NET_IPV6_RTR_PROBE_INTERVAL,
4040 			.procname	=	"router_probe_interval",
4041 			.data		=	&ipv6_devconf.rtr_probe_interval,
4042 			.maxlen		=	sizeof(int),
4043 			.mode		=	0644,
4044 			.proc_handler	=	&proc_dointvec_jiffies,
4045 			.strategy	=	&sysctl_jiffies,
4046 		},
4047 #ifdef CONFIG_IPV6_ROUTE_INFO
4048 		{
4049 			.ctl_name	=	NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN,
4050 			.procname	=	"accept_ra_rt_info_max_plen",
4051 			.data		=	&ipv6_devconf.accept_ra_rt_info_max_plen,
4052 			.maxlen		=	sizeof(int),
4053 			.mode		=	0644,
4054 			.proc_handler	=	&proc_dointvec,
4055 		},
4056 #endif
4057 #endif
4058 		{
4059 			.ctl_name	=	NET_IPV6_PROXY_NDP,
4060 			.procname	=	"proxy_ndp",
4061 			.data		=	&ipv6_devconf.proxy_ndp,
4062 			.maxlen		=	sizeof(int),
4063 			.mode		=	0644,
4064 			.proc_handler	=	&proc_dointvec,
4065 		},
4066 		{
4067 			.ctl_name	=	NET_IPV6_ACCEPT_SOURCE_ROUTE,
4068 			.procname	=	"accept_source_route",
4069 			.data		=	&ipv6_devconf.accept_source_route,
4070 			.maxlen		=	sizeof(int),
4071 			.mode		=	0644,
4072 			.proc_handler	=	&proc_dointvec,
4073 		},
4074 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4075 		{
4076 			.ctl_name	=	CTL_UNNUMBERED,
4077 			.procname       =       "optimistic_dad",
4078 			.data           =       &ipv6_devconf.optimistic_dad,
4079 			.maxlen         =       sizeof(int),
4080 			.mode           =       0644,
4081 			.proc_handler   =       &proc_dointvec,
4082 
4083 		},
4084 #endif
4085 		{
4086 			.ctl_name	=	0,	/* sentinel */
4087 		}
4088 	},
4089 };
4090 
4091 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4092 		int ctl_name, struct inet6_dev *idev, struct ipv6_devconf *p)
4093 {
4094 	int i;
4095 	struct addrconf_sysctl_table *t;
4096 
4097 #define ADDRCONF_CTL_PATH_DEV	3
4098 
4099 	struct ctl_path addrconf_ctl_path[] = {
4100 		{ .procname = "net", .ctl_name = CTL_NET, },
4101 		{ .procname = "ipv6", .ctl_name = NET_IPV6, },
4102 		{ .procname = "conf", .ctl_name = NET_IPV6_CONF, },
4103 		{ /* to be set */ },
4104 		{ },
4105 	};
4106 
4107 
4108 	t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4109 	if (t == NULL)
4110 		goto out;
4111 
4112 	for (i=0; t->addrconf_vars[i].data; i++) {
4113 		t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
4114 		t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4115 		t->addrconf_vars[i].extra2 = net;
4116 	}
4117 
4118 	/*
4119 	 * Make a copy of dev_name, because '.procname' is regarded as const
4120 	 * by sysctl and we wouldn't want anyone to change it under our feet
4121 	 * (see SIOCSIFNAME).
4122 	 */
4123 	t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4124 	if (!t->dev_name)
4125 		goto free;
4126 
4127 	addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
4128 	addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].ctl_name = ctl_name;
4129 
4130 	t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
4131 			t->addrconf_vars);
4132 	if (t->sysctl_header == NULL)
4133 		goto free_procname;
4134 
4135 	p->sysctl = t;
4136 	return 0;
4137 
4138 free_procname:
4139 	kfree(t->dev_name);
4140 free:
4141 	kfree(t);
4142 out:
4143 	return -ENOBUFS;
4144 }
4145 
4146 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4147 {
4148 	struct addrconf_sysctl_table *t;
4149 
4150 	if (p->sysctl == NULL)
4151 		return;
4152 
4153 	t = p->sysctl;
4154 	p->sysctl = NULL;
4155 	unregister_sysctl_table(t->sysctl_header);
4156 	kfree(t->dev_name);
4157 	kfree(t);
4158 }
4159 
4160 static void addrconf_sysctl_register(struct inet6_dev *idev)
4161 {
4162 	neigh_sysctl_register(idev->dev, idev->nd_parms, NET_IPV6,
4163 			      NET_IPV6_NEIGH, "ipv6",
4164 			      &ndisc_ifinfo_sysctl_change,
4165 			      NULL);
4166 	__addrconf_sysctl_register(idev->dev->nd_net, idev->dev->name,
4167 			idev->dev->ifindex, idev, &idev->cnf);
4168 }
4169 
4170 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
4171 {
4172 	__addrconf_sysctl_unregister(&idev->cnf);
4173 	neigh_sysctl_unregister(idev->nd_parms);
4174 }
4175 
4176 
4177 #endif
4178 
4179 static int addrconf_init_net(struct net *net)
4180 {
4181 	int err;
4182 	struct ipv6_devconf *all, *dflt;
4183 
4184 	err = -ENOMEM;
4185 	all = &ipv6_devconf;
4186 	dflt = &ipv6_devconf_dflt;
4187 
4188 	if (net != &init_net) {
4189 		all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4190 		if (all == NULL)
4191 			goto err_alloc_all;
4192 
4193 		dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4194 		if (dflt == NULL)
4195 			goto err_alloc_dflt;
4196 	}
4197 
4198 	net->ipv6.devconf_all = all;
4199 	net->ipv6.devconf_dflt = dflt;
4200 
4201 #ifdef CONFIG_SYSCTL
4202 	err = __addrconf_sysctl_register(net, "all", NET_PROTO_CONF_ALL,
4203 			NULL, all);
4204 	if (err < 0)
4205 		goto err_reg_all;
4206 
4207 	err = __addrconf_sysctl_register(net, "default", NET_PROTO_CONF_DEFAULT,
4208 			NULL, dflt);
4209 	if (err < 0)
4210 		goto err_reg_dflt;
4211 #endif
4212 	return 0;
4213 
4214 #ifdef CONFIG_SYSCTL
4215 err_reg_dflt:
4216 	__addrconf_sysctl_unregister(all);
4217 err_reg_all:
4218 	kfree(dflt);
4219 #endif
4220 err_alloc_dflt:
4221 	kfree(all);
4222 err_alloc_all:
4223 	return err;
4224 }
4225 
4226 static void addrconf_exit_net(struct net *net)
4227 {
4228 #ifdef CONFIG_SYSCTL
4229 	__addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4230 	__addrconf_sysctl_unregister(net->ipv6.devconf_all);
4231 #endif
4232 	if (net != &init_net) {
4233 		kfree(net->ipv6.devconf_dflt);
4234 		kfree(net->ipv6.devconf_all);
4235 	}
4236 }
4237 
4238 static struct pernet_operations addrconf_ops = {
4239 	.init = addrconf_init_net,
4240 	.exit = addrconf_exit_net,
4241 };
4242 
4243 /*
4244  *      Device notifier
4245  */
4246 
4247 int register_inet6addr_notifier(struct notifier_block *nb)
4248 {
4249 	return atomic_notifier_chain_register(&inet6addr_chain, nb);
4250 }
4251 
4252 EXPORT_SYMBOL(register_inet6addr_notifier);
4253 
4254 int unregister_inet6addr_notifier(struct notifier_block *nb)
4255 {
4256 	return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
4257 }
4258 
4259 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4260 
4261 /*
4262  *	Init / cleanup code
4263  */
4264 
4265 int __init addrconf_init(void)
4266 {
4267 	int err;
4268 
4269 	if ((err = ipv6_addr_label_init()) < 0) {
4270 		printk(KERN_CRIT "IPv6 Addrconf: cannot initialize default policy table: %d.\n",
4271 			err);
4272 		return err;
4273 	}
4274 
4275 	register_pernet_subsys(&addrconf_ops);
4276 
4277 	/* The addrconf netdev notifier requires that loopback_dev
4278 	 * has it's ipv6 private information allocated and setup
4279 	 * before it can bring up and give link-local addresses
4280 	 * to other devices which are up.
4281 	 *
4282 	 * Unfortunately, loopback_dev is not necessarily the first
4283 	 * entry in the global dev_base list of net devices.  In fact,
4284 	 * it is likely to be the very last entry on that list.
4285 	 * So this causes the notifier registry below to try and
4286 	 * give link-local addresses to all devices besides loopback_dev
4287 	 * first, then loopback_dev, which cases all the non-loopback_dev
4288 	 * devices to fail to get a link-local address.
4289 	 *
4290 	 * So, as a temporary fix, allocate the ipv6 structure for
4291 	 * loopback_dev first by hand.
4292 	 * Longer term, all of the dependencies ipv6 has upon the loopback
4293 	 * device and it being up should be removed.
4294 	 */
4295 	rtnl_lock();
4296 	if (!ipv6_add_dev(init_net.loopback_dev))
4297 		err = -ENOMEM;
4298 	rtnl_unlock();
4299 	if (err)
4300 		goto errlo;
4301 
4302 	ip6_null_entry.u.dst.dev = init_net.loopback_dev;
4303 	ip6_null_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev);
4304 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
4305 	ip6_prohibit_entry.u.dst.dev = init_net.loopback_dev;
4306 	ip6_prohibit_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev);
4307 	ip6_blk_hole_entry.u.dst.dev = init_net.loopback_dev;
4308 	ip6_blk_hole_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev);
4309 #endif
4310 
4311 	register_netdevice_notifier(&ipv6_dev_notf);
4312 
4313 	addrconf_verify(0);
4314 
4315 	err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4316 	if (err < 0)
4317 		goto errout;
4318 
4319 	/* Only the first call to __rtnl_register can fail */
4320 	__rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4321 	__rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4322 	__rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4323 	__rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4324 	__rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4325 
4326 	ipv6_addr_label_rtnl_register();
4327 
4328 	return 0;
4329 errout:
4330 	unregister_netdevice_notifier(&ipv6_dev_notf);
4331 errlo:
4332 	unregister_pernet_subsys(&addrconf_ops);
4333 
4334 	return err;
4335 }
4336 
4337 void addrconf_cleanup(void)
4338 {
4339 	struct net_device *dev;
4340 	struct inet6_ifaddr *ifa;
4341 	int i;
4342 
4343 	unregister_netdevice_notifier(&ipv6_dev_notf);
4344 
4345 	unregister_pernet_subsys(&addrconf_ops);
4346 
4347 	rtnl_lock();
4348 
4349 	/*
4350 	 *	clean dev list.
4351 	 */
4352 
4353 	for_each_netdev(&init_net, dev) {
4354 		if (__in6_dev_get(dev) == NULL)
4355 			continue;
4356 		addrconf_ifdown(dev, 1);
4357 	}
4358 	addrconf_ifdown(init_net.loopback_dev, 2);
4359 
4360 	/*
4361 	 *	Check hash table.
4362 	 */
4363 
4364 	write_lock_bh(&addrconf_hash_lock);
4365 	for (i=0; i < IN6_ADDR_HSIZE; i++) {
4366 		for (ifa=inet6_addr_lst[i]; ifa; ) {
4367 			struct inet6_ifaddr *bifa;
4368 
4369 			bifa = ifa;
4370 			ifa = ifa->lst_next;
4371 			printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
4372 			/* Do not free it; something is wrong.
4373 			   Now we can investigate it with debugger.
4374 			 */
4375 		}
4376 	}
4377 	write_unlock_bh(&addrconf_hash_lock);
4378 
4379 	del_timer(&addr_chk_timer);
4380 
4381 	rtnl_unlock();
4382 }
4383