xref: /openbmc/linux/net/ipv6/addrconf.c (revision f42b3800)
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 const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
226 const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
227 
228 /* Check if a valid qdisc is available */
229 static inline int addrconf_qdisc_ok(struct net_device *dev)
230 {
231 	return (dev->qdisc != &noop_qdisc);
232 }
233 
234 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
235 {
236 	if (del_timer(&ifp->timer))
237 		__in6_ifa_put(ifp);
238 }
239 
240 enum addrconf_timer_t
241 {
242 	AC_NONE,
243 	AC_DAD,
244 	AC_RS,
245 };
246 
247 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
248 			       enum addrconf_timer_t what,
249 			       unsigned long when)
250 {
251 	if (!del_timer(&ifp->timer))
252 		in6_ifa_hold(ifp);
253 
254 	switch (what) {
255 	case AC_DAD:
256 		ifp->timer.function = addrconf_dad_timer;
257 		break;
258 	case AC_RS:
259 		ifp->timer.function = addrconf_rs_timer;
260 		break;
261 	default:;
262 	}
263 	ifp->timer.expires = jiffies + when;
264 	add_timer(&ifp->timer);
265 }
266 
267 static int snmp6_alloc_dev(struct inet6_dev *idev)
268 {
269 	if (snmp_mib_init((void **)idev->stats.ipv6,
270 			  sizeof(struct ipstats_mib)) < 0)
271 		goto err_ip;
272 	if (snmp_mib_init((void **)idev->stats.icmpv6,
273 			  sizeof(struct icmpv6_mib)) < 0)
274 		goto err_icmp;
275 	if (snmp_mib_init((void **)idev->stats.icmpv6msg,
276 			  sizeof(struct icmpv6msg_mib)) < 0)
277 		goto err_icmpmsg;
278 
279 	return 0;
280 
281 err_icmpmsg:
282 	snmp_mib_free((void **)idev->stats.icmpv6);
283 err_icmp:
284 	snmp_mib_free((void **)idev->stats.ipv6);
285 err_ip:
286 	return -ENOMEM;
287 }
288 
289 static void snmp6_free_dev(struct inet6_dev *idev)
290 {
291 	snmp_mib_free((void **)idev->stats.icmpv6msg);
292 	snmp_mib_free((void **)idev->stats.icmpv6);
293 	snmp_mib_free((void **)idev->stats.ipv6);
294 }
295 
296 /* Nobody refers to this device, we may destroy it. */
297 
298 static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
299 {
300 	struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
301 	kfree(idev);
302 }
303 
304 void in6_dev_finish_destroy(struct inet6_dev *idev)
305 {
306 	struct net_device *dev = idev->dev;
307 	BUG_TRAP(idev->addr_list==NULL);
308 	BUG_TRAP(idev->mc_list==NULL);
309 #ifdef NET_REFCNT_DEBUG
310 	printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
311 #endif
312 	dev_put(dev);
313 	if (!idev->dead) {
314 		printk("Freeing alive inet6 device %p\n", idev);
315 		return;
316 	}
317 	snmp6_free_dev(idev);
318 	call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
319 }
320 
321 EXPORT_SYMBOL(in6_dev_finish_destroy);
322 
323 static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
324 {
325 	struct inet6_dev *ndev;
326 
327 	ASSERT_RTNL();
328 
329 	if (dev->mtu < IPV6_MIN_MTU)
330 		return NULL;
331 
332 	ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
333 
334 	if (ndev == NULL)
335 		return NULL;
336 
337 	rwlock_init(&ndev->lock);
338 	ndev->dev = dev;
339 	memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
340 	ndev->cnf.mtu6 = dev->mtu;
341 	ndev->cnf.sysctl = NULL;
342 	ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
343 	if (ndev->nd_parms == NULL) {
344 		kfree(ndev);
345 		return NULL;
346 	}
347 	/* We refer to the device */
348 	dev_hold(dev);
349 
350 	if (snmp6_alloc_dev(ndev) < 0) {
351 		ADBG((KERN_WARNING
352 			"%s(): cannot allocate memory for statistics; dev=%s.\n",
353 			__func__, dev->name));
354 		neigh_parms_release(&nd_tbl, ndev->nd_parms);
355 		ndev->dead = 1;
356 		in6_dev_finish_destroy(ndev);
357 		return NULL;
358 	}
359 
360 	if (snmp6_register_dev(ndev) < 0) {
361 		ADBG((KERN_WARNING
362 			"%s(): cannot create /proc/net/dev_snmp6/%s\n",
363 			__func__, dev->name));
364 		neigh_parms_release(&nd_tbl, ndev->nd_parms);
365 		ndev->dead = 1;
366 		in6_dev_finish_destroy(ndev);
367 		return NULL;
368 	}
369 
370 	/* One reference from device.  We must do this before
371 	 * we invoke __ipv6_regen_rndid().
372 	 */
373 	in6_dev_hold(ndev);
374 
375 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
376 	if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
377 		printk(KERN_INFO
378 		       "%s: Disabled Multicast RS\n",
379 		       dev->name);
380 		ndev->cnf.rtr_solicits = 0;
381 	}
382 #endif
383 
384 #ifdef CONFIG_IPV6_PRIVACY
385 	setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
386 	if ((dev->flags&IFF_LOOPBACK) ||
387 	    dev->type == ARPHRD_TUNNEL ||
388 	    dev->type == ARPHRD_TUNNEL6 ||
389 	    dev->type == ARPHRD_SIT ||
390 	    dev->type == ARPHRD_NONE) {
391 		printk(KERN_INFO
392 		       "%s: Disabled Privacy Extensions\n",
393 		       dev->name);
394 		ndev->cnf.use_tempaddr = -1;
395 	} else {
396 		in6_dev_hold(ndev);
397 		ipv6_regen_rndid((unsigned long) ndev);
398 	}
399 #endif
400 
401 	if (netif_running(dev) && addrconf_qdisc_ok(dev))
402 		ndev->if_flags |= IF_READY;
403 
404 	ipv6_mc_init_dev(ndev);
405 	ndev->tstamp = jiffies;
406 	addrconf_sysctl_register(ndev);
407 	/* protected by rtnl_lock */
408 	rcu_assign_pointer(dev->ip6_ptr, ndev);
409 
410 	/* Join all-node multicast group */
411 	ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
412 
413 	return ndev;
414 }
415 
416 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
417 {
418 	struct inet6_dev *idev;
419 
420 	ASSERT_RTNL();
421 
422 	if ((idev = __in6_dev_get(dev)) == NULL) {
423 		if ((idev = ipv6_add_dev(dev)) == NULL)
424 			return NULL;
425 	}
426 
427 	if (dev->flags&IFF_UP)
428 		ipv6_mc_up(idev);
429 	return idev;
430 }
431 
432 #ifdef CONFIG_SYSCTL
433 static void dev_forward_change(struct inet6_dev *idev)
434 {
435 	struct net_device *dev;
436 	struct inet6_ifaddr *ifa;
437 
438 	if (!idev)
439 		return;
440 	dev = idev->dev;
441 	if (dev && (dev->flags & IFF_MULTICAST)) {
442 		if (idev->cnf.forwarding)
443 			ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
444 		else
445 			ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
446 	}
447 	for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
448 		if (ifa->flags&IFA_F_TENTATIVE)
449 			continue;
450 		if (idev->cnf.forwarding)
451 			addrconf_join_anycast(ifa);
452 		else
453 			addrconf_leave_anycast(ifa);
454 	}
455 }
456 
457 
458 static void addrconf_forward_change(struct net *net, __s32 newf)
459 {
460 	struct net_device *dev;
461 	struct inet6_dev *idev;
462 
463 	read_lock(&dev_base_lock);
464 	for_each_netdev(net, dev) {
465 		rcu_read_lock();
466 		idev = __in6_dev_get(dev);
467 		if (idev) {
468 			int changed = (!idev->cnf.forwarding) ^ (!newf);
469 			idev->cnf.forwarding = newf;
470 			if (changed)
471 				dev_forward_change(idev);
472 		}
473 		rcu_read_unlock();
474 	}
475 	read_unlock(&dev_base_lock);
476 }
477 
478 static void addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old)
479 {
480 	struct net *net;
481 
482 	net = (struct net *)table->extra2;
483 	if (p == &net->ipv6.devconf_dflt->forwarding)
484 		return;
485 
486 	if (p == &net->ipv6.devconf_all->forwarding) {
487 		__s32 newf = net->ipv6.devconf_all->forwarding;
488 		net->ipv6.devconf_dflt->forwarding = newf;
489 		addrconf_forward_change(net, newf);
490 	} else if ((!*p) ^ (!old))
491 		dev_forward_change((struct inet6_dev *)table->extra1);
492 
493 	if (*p)
494 		rt6_purge_dflt_routers(net);
495 }
496 #endif
497 
498 /* Nobody refers to this ifaddr, destroy it */
499 
500 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
501 {
502 	BUG_TRAP(ifp->if_next==NULL);
503 	BUG_TRAP(ifp->lst_next==NULL);
504 #ifdef NET_REFCNT_DEBUG
505 	printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
506 #endif
507 
508 	in6_dev_put(ifp->idev);
509 
510 	if (del_timer(&ifp->timer))
511 		printk("Timer is still running, when freeing ifa=%p\n", ifp);
512 
513 	if (!ifp->dead) {
514 		printk("Freeing alive inet6 address %p\n", ifp);
515 		return;
516 	}
517 	dst_release(&ifp->rt->u.dst);
518 
519 	kfree(ifp);
520 }
521 
522 static void
523 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
524 {
525 	struct inet6_ifaddr *ifa, **ifap;
526 	int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
527 
528 	/*
529 	 * Each device address list is sorted in order of scope -
530 	 * global before linklocal.
531 	 */
532 	for (ifap = &idev->addr_list; (ifa = *ifap) != NULL;
533 	     ifap = &ifa->if_next) {
534 		if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
535 			break;
536 	}
537 
538 	ifp->if_next = *ifap;
539 	*ifap = ifp;
540 }
541 
542 /*
543  *	Hash function taken from net_alias.c
544  */
545 static u8 ipv6_addr_hash(const struct in6_addr *addr)
546 {
547 	__u32 word;
548 
549 	/*
550 	 * We perform the hash function over the last 64 bits of the address
551 	 * This will include the IEEE address token on links that support it.
552 	 */
553 
554 	word = (__force u32)(addr->s6_addr32[2] ^ addr->s6_addr32[3]);
555 	word ^= (word >> 16);
556 	word ^= (word >> 8);
557 
558 	return ((word ^ (word >> 4)) & 0x0f);
559 }
560 
561 /* On success it returns ifp with increased reference count */
562 
563 static struct inet6_ifaddr *
564 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
565 	      int scope, u32 flags)
566 {
567 	struct inet6_ifaddr *ifa = NULL;
568 	struct rt6_info *rt;
569 	int hash;
570 	int err = 0;
571 
572 	rcu_read_lock_bh();
573 	if (idev->dead) {
574 		err = -ENODEV;			/*XXX*/
575 		goto out2;
576 	}
577 
578 	write_lock(&addrconf_hash_lock);
579 
580 	/* Ignore adding duplicate addresses on an interface */
581 	if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
582 		ADBG(("ipv6_add_addr: already assigned\n"));
583 		err = -EEXIST;
584 		goto out;
585 	}
586 
587 	ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
588 
589 	if (ifa == NULL) {
590 		ADBG(("ipv6_add_addr: malloc failed\n"));
591 		err = -ENOBUFS;
592 		goto out;
593 	}
594 
595 	rt = addrconf_dst_alloc(idev, addr, 0);
596 	if (IS_ERR(rt)) {
597 		err = PTR_ERR(rt);
598 		goto out;
599 	}
600 
601 	ipv6_addr_copy(&ifa->addr, addr);
602 
603 	spin_lock_init(&ifa->lock);
604 	init_timer(&ifa->timer);
605 	ifa->timer.data = (unsigned long) ifa;
606 	ifa->scope = scope;
607 	ifa->prefix_len = pfxlen;
608 	ifa->flags = flags | IFA_F_TENTATIVE;
609 	ifa->cstamp = ifa->tstamp = jiffies;
610 
611 	ifa->rt = rt;
612 
613 	/*
614 	 * part one of RFC 4429, section 3.3
615 	 * We should not configure an address as
616 	 * optimistic if we do not yet know the link
617 	 * layer address of our nexhop router
618 	 */
619 
620 	if (rt->rt6i_nexthop == NULL)
621 		ifa->flags &= ~IFA_F_OPTIMISTIC;
622 
623 	ifa->idev = idev;
624 	in6_dev_hold(idev);
625 	/* For caller */
626 	in6_ifa_hold(ifa);
627 
628 	/* Add to big hash table */
629 	hash = ipv6_addr_hash(addr);
630 
631 	ifa->lst_next = inet6_addr_lst[hash];
632 	inet6_addr_lst[hash] = ifa;
633 	in6_ifa_hold(ifa);
634 	write_unlock(&addrconf_hash_lock);
635 
636 	write_lock(&idev->lock);
637 	/* Add to inet6_dev unicast addr list. */
638 	ipv6_link_dev_addr(idev, ifa);
639 
640 #ifdef CONFIG_IPV6_PRIVACY
641 	if (ifa->flags&IFA_F_TEMPORARY) {
642 		ifa->tmp_next = idev->tempaddr_list;
643 		idev->tempaddr_list = ifa;
644 		in6_ifa_hold(ifa);
645 	}
646 #endif
647 
648 	in6_ifa_hold(ifa);
649 	write_unlock(&idev->lock);
650 out2:
651 	rcu_read_unlock_bh();
652 
653 	if (likely(err == 0))
654 		atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
655 	else {
656 		kfree(ifa);
657 		ifa = ERR_PTR(err);
658 	}
659 
660 	return ifa;
661 out:
662 	write_unlock(&addrconf_hash_lock);
663 	goto out2;
664 }
665 
666 /* This function wants to get referenced ifp and releases it before return */
667 
668 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
669 {
670 	struct inet6_ifaddr *ifa, **ifap;
671 	struct inet6_dev *idev = ifp->idev;
672 	int hash;
673 	int deleted = 0, onlink = 0;
674 	unsigned long expires = jiffies;
675 
676 	hash = ipv6_addr_hash(&ifp->addr);
677 
678 	ifp->dead = 1;
679 
680 	write_lock_bh(&addrconf_hash_lock);
681 	for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
682 	     ifap = &ifa->lst_next) {
683 		if (ifa == ifp) {
684 			*ifap = ifa->lst_next;
685 			__in6_ifa_put(ifp);
686 			ifa->lst_next = NULL;
687 			break;
688 		}
689 	}
690 	write_unlock_bh(&addrconf_hash_lock);
691 
692 	write_lock_bh(&idev->lock);
693 #ifdef CONFIG_IPV6_PRIVACY
694 	if (ifp->flags&IFA_F_TEMPORARY) {
695 		for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
696 		     ifap = &ifa->tmp_next) {
697 			if (ifa == ifp) {
698 				*ifap = ifa->tmp_next;
699 				if (ifp->ifpub) {
700 					in6_ifa_put(ifp->ifpub);
701 					ifp->ifpub = NULL;
702 				}
703 				__in6_ifa_put(ifp);
704 				ifa->tmp_next = NULL;
705 				break;
706 			}
707 		}
708 	}
709 #endif
710 
711 	for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
712 		if (ifa == ifp) {
713 			*ifap = ifa->if_next;
714 			__in6_ifa_put(ifp);
715 			ifa->if_next = NULL;
716 			if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
717 				break;
718 			deleted = 1;
719 			continue;
720 		} else if (ifp->flags & IFA_F_PERMANENT) {
721 			if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
722 					      ifp->prefix_len)) {
723 				if (ifa->flags & IFA_F_PERMANENT) {
724 					onlink = 1;
725 					if (deleted)
726 						break;
727 				} else {
728 					unsigned long lifetime;
729 
730 					if (!onlink)
731 						onlink = -1;
732 
733 					spin_lock(&ifa->lock);
734 					lifetime = min_t(unsigned long,
735 							 ifa->valid_lft, 0x7fffffffUL/HZ);
736 					if (time_before(expires,
737 							ifa->tstamp + lifetime * HZ))
738 						expires = ifa->tstamp + lifetime * HZ;
739 					spin_unlock(&ifa->lock);
740 				}
741 			}
742 		}
743 		ifap = &ifa->if_next;
744 	}
745 	write_unlock_bh(&idev->lock);
746 
747 	ipv6_ifa_notify(RTM_DELADDR, ifp);
748 
749 	atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
750 
751 	addrconf_del_timer(ifp);
752 
753 	/*
754 	 * Purge or update corresponding prefix
755 	 *
756 	 * 1) we don't purge prefix here if address was not permanent.
757 	 *    prefix is managed by its own lifetime.
758 	 * 2) if there're no addresses, delete prefix.
759 	 * 3) if there're still other permanent address(es),
760 	 *    corresponding prefix is still permanent.
761 	 * 4) otherwise, update prefix lifetime to the
762 	 *    longest valid lifetime among the corresponding
763 	 *    addresses on the device.
764 	 *    Note: subsequent RA will update lifetime.
765 	 *
766 	 * --yoshfuji
767 	 */
768 	if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
769 		struct in6_addr prefix;
770 		struct rt6_info *rt;
771 		struct net *net = dev_net(ifp->idev->dev);
772 		ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
773 		rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1);
774 
775 		if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
776 			if (onlink == 0) {
777 				ip6_del_rt(rt);
778 				rt = NULL;
779 			} else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
780 				rt->rt6i_expires = expires;
781 				rt->rt6i_flags |= RTF_EXPIRES;
782 			}
783 		}
784 		dst_release(&rt->u.dst);
785 	}
786 
787 	in6_ifa_put(ifp);
788 }
789 
790 #ifdef CONFIG_IPV6_PRIVACY
791 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
792 {
793 	struct inet6_dev *idev = ifp->idev;
794 	struct in6_addr addr, *tmpaddr;
795 	unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
796 	unsigned long regen_advance;
797 	int tmp_plen;
798 	int ret = 0;
799 	int max_addresses;
800 	u32 addr_flags;
801 
802 	write_lock(&idev->lock);
803 	if (ift) {
804 		spin_lock_bh(&ift->lock);
805 		memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
806 		spin_unlock_bh(&ift->lock);
807 		tmpaddr = &addr;
808 	} else {
809 		tmpaddr = NULL;
810 	}
811 retry:
812 	in6_dev_hold(idev);
813 	if (idev->cnf.use_tempaddr <= 0) {
814 		write_unlock(&idev->lock);
815 		printk(KERN_INFO
816 			"ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
817 		in6_dev_put(idev);
818 		ret = -1;
819 		goto out;
820 	}
821 	spin_lock_bh(&ifp->lock);
822 	if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
823 		idev->cnf.use_tempaddr = -1;	/*XXX*/
824 		spin_unlock_bh(&ifp->lock);
825 		write_unlock(&idev->lock);
826 		printk(KERN_WARNING
827 			"ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
828 		in6_dev_put(idev);
829 		ret = -1;
830 		goto out;
831 	}
832 	in6_ifa_hold(ifp);
833 	memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
834 	if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
835 		spin_unlock_bh(&ifp->lock);
836 		write_unlock(&idev->lock);
837 		printk(KERN_WARNING
838 			"ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
839 		in6_ifa_put(ifp);
840 		in6_dev_put(idev);
841 		ret = -1;
842 		goto out;
843 	}
844 	memcpy(&addr.s6_addr[8], idev->rndid, 8);
845 	tmp_valid_lft = min_t(__u32,
846 			      ifp->valid_lft,
847 			      idev->cnf.temp_valid_lft);
848 	tmp_prefered_lft = min_t(__u32,
849 				 ifp->prefered_lft,
850 				 idev->cnf.temp_prefered_lft - desync_factor / HZ);
851 	tmp_plen = ifp->prefix_len;
852 	max_addresses = idev->cnf.max_addresses;
853 	tmp_cstamp = ifp->cstamp;
854 	tmp_tstamp = ifp->tstamp;
855 	spin_unlock_bh(&ifp->lock);
856 
857 	regen_advance = idev->cnf.regen_max_retry *
858 	                idev->cnf.dad_transmits *
859 	                idev->nd_parms->retrans_time / HZ;
860 	write_unlock(&idev->lock);
861 
862 	/* A temporary address is created only if this calculated Preferred
863 	 * Lifetime is greater than REGEN_ADVANCE time units.  In particular,
864 	 * an implementation must not create a temporary address with a zero
865 	 * Preferred Lifetime.
866 	 */
867 	if (tmp_prefered_lft <= regen_advance) {
868 		in6_ifa_put(ifp);
869 		in6_dev_put(idev);
870 		ret = -1;
871 		goto out;
872 	}
873 
874 	addr_flags = IFA_F_TEMPORARY;
875 	/* set in addrconf_prefix_rcv() */
876 	if (ifp->flags & IFA_F_OPTIMISTIC)
877 		addr_flags |= IFA_F_OPTIMISTIC;
878 
879 	ift = !max_addresses ||
880 	      ipv6_count_addresses(idev) < max_addresses ?
881 		ipv6_add_addr(idev, &addr, tmp_plen,
882 			      ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
883 			      addr_flags) : NULL;
884 	if (!ift || IS_ERR(ift)) {
885 		in6_ifa_put(ifp);
886 		in6_dev_put(idev);
887 		printk(KERN_INFO
888 			"ipv6_create_tempaddr(): retry temporary address regeneration.\n");
889 		tmpaddr = &addr;
890 		write_lock(&idev->lock);
891 		goto retry;
892 	}
893 
894 	spin_lock_bh(&ift->lock);
895 	ift->ifpub = ifp;
896 	ift->valid_lft = tmp_valid_lft;
897 	ift->prefered_lft = tmp_prefered_lft;
898 	ift->cstamp = tmp_cstamp;
899 	ift->tstamp = tmp_tstamp;
900 	spin_unlock_bh(&ift->lock);
901 
902 	addrconf_dad_start(ift, 0);
903 	in6_ifa_put(ift);
904 	in6_dev_put(idev);
905 out:
906 	return ret;
907 }
908 #endif
909 
910 /*
911  *	Choose an appropriate source address (RFC3484)
912  */
913 enum {
914 	IPV6_SADDR_RULE_INIT = 0,
915 	IPV6_SADDR_RULE_LOCAL,
916 	IPV6_SADDR_RULE_SCOPE,
917 	IPV6_SADDR_RULE_PREFERRED,
918 #ifdef CONFIG_IPV6_MIP6
919 	IPV6_SADDR_RULE_HOA,
920 #endif
921 	IPV6_SADDR_RULE_OIF,
922 	IPV6_SADDR_RULE_LABEL,
923 #ifdef CONFIG_IPV6_PRIVACY
924 	IPV6_SADDR_RULE_PRIVACY,
925 #endif
926 	IPV6_SADDR_RULE_ORCHID,
927 	IPV6_SADDR_RULE_PREFIX,
928 	IPV6_SADDR_RULE_MAX
929 };
930 
931 struct ipv6_saddr_score {
932 	int			rule;
933 	int			addr_type;
934 	struct inet6_ifaddr	*ifa;
935 	DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
936 	int			scopedist;
937 	int			matchlen;
938 };
939 
940 struct ipv6_saddr_dst {
941 	const struct in6_addr *addr;
942 	int ifindex;
943 	int scope;
944 	int label;
945 	unsigned int prefs;
946 };
947 
948 static inline int ipv6_saddr_preferred(int type)
949 {
950 	if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
951 		    IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
952 		return 1;
953 	return 0;
954 }
955 
956 static int ipv6_get_saddr_eval(struct ipv6_saddr_score *score,
957 			       struct ipv6_saddr_dst *dst,
958 			       int i)
959 {
960 	int ret;
961 
962 	if (i <= score->rule) {
963 		switch (i) {
964 		case IPV6_SADDR_RULE_SCOPE:
965 			ret = score->scopedist;
966 			break;
967 		case IPV6_SADDR_RULE_PREFIX:
968 			ret = score->matchlen;
969 			break;
970 		default:
971 			ret = !!test_bit(i, score->scorebits);
972 		}
973 		goto out;
974 	}
975 
976 	switch (i) {
977 	case IPV6_SADDR_RULE_INIT:
978 		/* Rule 0: remember if hiscore is not ready yet */
979 		ret = !!score->ifa;
980 		break;
981 	case IPV6_SADDR_RULE_LOCAL:
982 		/* Rule 1: Prefer same address */
983 		ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
984 		break;
985 	case IPV6_SADDR_RULE_SCOPE:
986 		/* Rule 2: Prefer appropriate scope
987 		 *
988 		 *      ret
989 		 *       ^
990 		 *    -1 |  d 15
991 		 *    ---+--+-+---> scope
992 		 *       |
993 		 *       |             d is scope of the destination.
994 		 *  B-d  |  \
995 		 *       |   \      <- smaller scope is better if
996 		 *  B-15 |    \        if scope is enough for destinaion.
997 		 *       |             ret = B - scope (-1 <= scope >= d <= 15).
998 		 * d-C-1 | /
999 		 *       |/         <- greater is better
1000 		 *   -C  /             if scope is not enough for destination.
1001 		 *      /|             ret = scope - C (-1 <= d < scope <= 15).
1002 		 *
1003 		 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1004 		 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1005 		 * Assume B = 0 and we get C > 29.
1006 		 */
1007 		ret = __ipv6_addr_src_scope(score->addr_type);
1008 		if (ret >= dst->scope)
1009 			ret = -ret;
1010 		else
1011 			ret -= 128;	/* 30 is enough */
1012 		score->scopedist = ret;
1013 		break;
1014 	case IPV6_SADDR_RULE_PREFERRED:
1015 		/* Rule 3: Avoid deprecated and optimistic addresses */
1016 		ret = ipv6_saddr_preferred(score->addr_type) ||
1017 		      !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1018 		break;
1019 #ifdef CONFIG_IPV6_MIP6
1020 	case IPV6_SADDR_RULE_HOA:
1021 	    {
1022 		/* Rule 4: Prefer home address */
1023 		int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1024 		ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1025 		break;
1026 	    }
1027 #endif
1028 	case IPV6_SADDR_RULE_OIF:
1029 		/* Rule 5: Prefer outgoing interface */
1030 		ret = (!dst->ifindex ||
1031 		       dst->ifindex == score->ifa->idev->dev->ifindex);
1032 		break;
1033 	case IPV6_SADDR_RULE_LABEL:
1034 		/* Rule 6: Prefer matching label */
1035 		ret = ipv6_addr_label(&score->ifa->addr, score->addr_type,
1036 				      score->ifa->idev->dev->ifindex) == dst->label;
1037 		break;
1038 #ifdef CONFIG_IPV6_PRIVACY
1039 	case IPV6_SADDR_RULE_PRIVACY:
1040 	    {
1041 		/* Rule 7: Prefer public address
1042 		 * Note: prefer temprary address if use_tempaddr >= 2
1043 		 */
1044 		int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1045 				!!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1046 				score->ifa->idev->cnf.use_tempaddr >= 2;
1047 		ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1048 		break;
1049 	    }
1050 #endif
1051 	case IPV6_SADDR_RULE_ORCHID:
1052 		/* Rule 8-: Prefer ORCHID vs ORCHID or
1053 		 *	    non-ORCHID vs non-ORCHID
1054 		 */
1055 		ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1056 			ipv6_addr_orchid(dst->addr));
1057 		break;
1058 	case IPV6_SADDR_RULE_PREFIX:
1059 		/* Rule 8: Use longest matching prefix */
1060 		score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr,
1061 						       dst->addr);
1062 		break;
1063 	default:
1064 		ret = 0;
1065 	}
1066 
1067 	if (ret)
1068 		__set_bit(i, score->scorebits);
1069 	score->rule = i;
1070 out:
1071 	return ret;
1072 }
1073 
1074 int ipv6_dev_get_saddr(struct net_device *dst_dev,
1075 		       const struct in6_addr *daddr, unsigned int prefs,
1076 		       struct in6_addr *saddr)
1077 {
1078 	struct ipv6_saddr_score scores[2],
1079 				*score = &scores[0], *hiscore = &scores[1];
1080 	struct net *net = dev_net(dst_dev);
1081 	struct ipv6_saddr_dst dst;
1082 	struct net_device *dev;
1083 	int dst_type;
1084 
1085 	dst_type = __ipv6_addr_type(daddr);
1086 	dst.addr = daddr;
1087 	dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1088 	dst.scope = __ipv6_addr_src_scope(dst_type);
1089 	dst.label = ipv6_addr_label(daddr, dst_type, dst.ifindex);
1090 	dst.prefs = prefs;
1091 
1092 	hiscore->rule = -1;
1093 	hiscore->ifa = NULL;
1094 
1095 	read_lock(&dev_base_lock);
1096 	rcu_read_lock();
1097 
1098 	for_each_netdev(net, dev) {
1099 		struct inet6_dev *idev;
1100 
1101 		/* Candidate Source Address (section 4)
1102 		 *  - multicast and link-local destination address,
1103 		 *    the set of candidate source address MUST only
1104 		 *    include addresses assigned to interfaces
1105 		 *    belonging to the same link as the outgoing
1106 		 *    interface.
1107 		 * (- For site-local destination addresses, the
1108 		 *    set of candidate source addresses MUST only
1109 		 *    include addresses assigned to interfaces
1110 		 *    belonging to the same site as the outgoing
1111 		 *    interface.)
1112 		 */
1113 		if (((dst_type & IPV6_ADDR_MULTICAST) ||
1114 		     dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1115 		    dst.ifindex && dev->ifindex != dst.ifindex)
1116 			continue;
1117 
1118 		idev = __in6_dev_get(dev);
1119 		if (!idev)
1120 			continue;
1121 
1122 		read_lock_bh(&idev->lock);
1123 		for (score->ifa = idev->addr_list; score->ifa; score->ifa = score->ifa->if_next) {
1124 			int i;
1125 
1126 			/*
1127 			 * - Tentative Address (RFC2462 section 5.4)
1128 			 *  - A tentative address is not considered
1129 			 *    "assigned to an interface" in the traditional
1130 			 *    sense, unless it is also flagged as optimistic.
1131 			 * - Candidate Source Address (section 4)
1132 			 *  - In any case, anycast addresses, multicast
1133 			 *    addresses, and the unspecified address MUST
1134 			 *    NOT be included in a candidate set.
1135 			 */
1136 			if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1137 			    (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1138 				continue;
1139 
1140 			score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1141 
1142 			if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1143 				     score->addr_type & IPV6_ADDR_MULTICAST)) {
1144 				LIMIT_NETDEBUG(KERN_DEBUG
1145 					       "ADDRCONF: unspecified / multicast address "
1146 					       "assigned as unicast address on %s",
1147 					       dev->name);
1148 				continue;
1149 			}
1150 
1151 			score->rule = -1;
1152 			bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1153 
1154 			for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1155 				int minihiscore, miniscore;
1156 
1157 				minihiscore = ipv6_get_saddr_eval(hiscore, &dst, i);
1158 				miniscore = ipv6_get_saddr_eval(score, &dst, i);
1159 
1160 				if (minihiscore > miniscore) {
1161 					if (i == IPV6_SADDR_RULE_SCOPE &&
1162 					    score->scopedist > 0) {
1163 						/*
1164 						 * special case:
1165 						 * each remaining entry
1166 						 * has too small (not enough)
1167 						 * scope, because ifa entries
1168 						 * are sorted by their scope
1169 						 * values.
1170 						 */
1171 						goto try_nextdev;
1172 					}
1173 					break;
1174 				} else if (minihiscore < miniscore) {
1175 					struct ipv6_saddr_score *tmp;
1176 
1177 					if (hiscore->ifa)
1178 						in6_ifa_put(hiscore->ifa);
1179 
1180 					in6_ifa_hold(score->ifa);
1181 
1182 					tmp = hiscore;
1183 					hiscore = score;
1184 					score = tmp;
1185 
1186 					/* restore our iterator */
1187 					score->ifa = hiscore->ifa;
1188 
1189 					break;
1190 				}
1191 			}
1192 		}
1193 try_nextdev:
1194 		read_unlock_bh(&idev->lock);
1195 	}
1196 	rcu_read_unlock();
1197 	read_unlock(&dev_base_lock);
1198 
1199 	if (!hiscore->ifa)
1200 		return -EADDRNOTAVAIL;
1201 
1202 	ipv6_addr_copy(saddr, &hiscore->ifa->addr);
1203 	in6_ifa_put(hiscore->ifa);
1204 	return 0;
1205 }
1206 
1207 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1208 
1209 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1210 		    unsigned char banned_flags)
1211 {
1212 	struct inet6_dev *idev;
1213 	int err = -EADDRNOTAVAIL;
1214 
1215 	rcu_read_lock();
1216 	if ((idev = __in6_dev_get(dev)) != NULL) {
1217 		struct inet6_ifaddr *ifp;
1218 
1219 		read_lock_bh(&idev->lock);
1220 		for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1221 			if (ifp->scope == IFA_LINK && !(ifp->flags & banned_flags)) {
1222 				ipv6_addr_copy(addr, &ifp->addr);
1223 				err = 0;
1224 				break;
1225 			}
1226 		}
1227 		read_unlock_bh(&idev->lock);
1228 	}
1229 	rcu_read_unlock();
1230 	return err;
1231 }
1232 
1233 static int ipv6_count_addresses(struct inet6_dev *idev)
1234 {
1235 	int cnt = 0;
1236 	struct inet6_ifaddr *ifp;
1237 
1238 	read_lock_bh(&idev->lock);
1239 	for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1240 		cnt++;
1241 	read_unlock_bh(&idev->lock);
1242 	return cnt;
1243 }
1244 
1245 int ipv6_chk_addr(struct net *net, struct in6_addr *addr,
1246 		  struct net_device *dev, int strict)
1247 {
1248 	struct inet6_ifaddr * ifp;
1249 	u8 hash = ipv6_addr_hash(addr);
1250 
1251 	read_lock_bh(&addrconf_hash_lock);
1252 	for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1253 		if (!net_eq(dev_net(ifp->idev->dev), net))
1254 			continue;
1255 		if (ipv6_addr_equal(&ifp->addr, addr) &&
1256 		    !(ifp->flags&IFA_F_TENTATIVE)) {
1257 			if (dev == NULL || ifp->idev->dev == dev ||
1258 			    !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1259 				break;
1260 		}
1261 	}
1262 	read_unlock_bh(&addrconf_hash_lock);
1263 	return ifp != NULL;
1264 }
1265 EXPORT_SYMBOL(ipv6_chk_addr);
1266 
1267 static
1268 int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1269 		       struct net_device *dev)
1270 {
1271 	struct inet6_ifaddr * ifp;
1272 	u8 hash = ipv6_addr_hash(addr);
1273 
1274 	for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1275 		if (!net_eq(dev_net(ifp->idev->dev), net))
1276 			continue;
1277 		if (ipv6_addr_equal(&ifp->addr, addr)) {
1278 			if (dev == NULL || ifp->idev->dev == dev)
1279 				break;
1280 		}
1281 	}
1282 	return ifp != NULL;
1283 }
1284 
1285 int ipv6_chk_prefix(struct in6_addr *addr, struct net_device *dev)
1286 {
1287 	struct inet6_dev *idev;
1288 	struct inet6_ifaddr *ifa;
1289 	int	onlink;
1290 
1291 	onlink = 0;
1292 	rcu_read_lock();
1293 	idev = __in6_dev_get(dev);
1294 	if (idev) {
1295 		read_lock_bh(&idev->lock);
1296 		for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
1297 			onlink = ipv6_prefix_equal(addr, &ifa->addr,
1298 						   ifa->prefix_len);
1299 			if (onlink)
1300 				break;
1301 		}
1302 		read_unlock_bh(&idev->lock);
1303 	}
1304 	rcu_read_unlock();
1305 	return onlink;
1306 }
1307 
1308 EXPORT_SYMBOL(ipv6_chk_prefix);
1309 
1310 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1311 				     struct net_device *dev, int strict)
1312 {
1313 	struct inet6_ifaddr * ifp;
1314 	u8 hash = ipv6_addr_hash(addr);
1315 
1316 	read_lock_bh(&addrconf_hash_lock);
1317 	for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1318 		if (!net_eq(dev_net(ifp->idev->dev), net))
1319 			continue;
1320 		if (ipv6_addr_equal(&ifp->addr, addr)) {
1321 			if (dev == NULL || ifp->idev->dev == dev ||
1322 			    !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1323 				in6_ifa_hold(ifp);
1324 				break;
1325 			}
1326 		}
1327 	}
1328 	read_unlock_bh(&addrconf_hash_lock);
1329 
1330 	return ifp;
1331 }
1332 
1333 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1334 {
1335 	const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
1336 	const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
1337 	__be32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
1338 	__be32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1339 	int sk_ipv6only = ipv6_only_sock(sk);
1340 	int sk2_ipv6only = inet_v6_ipv6only(sk2);
1341 	int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1342 	int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1343 
1344 	if (!sk2_rcv_saddr && !sk_ipv6only)
1345 		return 1;
1346 
1347 	if (addr_type2 == IPV6_ADDR_ANY &&
1348 	    !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1349 		return 1;
1350 
1351 	if (addr_type == IPV6_ADDR_ANY &&
1352 	    !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1353 		return 1;
1354 
1355 	if (sk2_rcv_saddr6 &&
1356 	    ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1357 		return 1;
1358 
1359 	if (addr_type == IPV6_ADDR_MAPPED &&
1360 	    !sk2_ipv6only &&
1361 	    (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1362 		return 1;
1363 
1364 	return 0;
1365 }
1366 
1367 /* Gets referenced address, destroys ifaddr */
1368 
1369 static void addrconf_dad_stop(struct inet6_ifaddr *ifp)
1370 {
1371 	if (ifp->flags&IFA_F_PERMANENT) {
1372 		spin_lock_bh(&ifp->lock);
1373 		addrconf_del_timer(ifp);
1374 		ifp->flags |= IFA_F_TENTATIVE;
1375 		spin_unlock_bh(&ifp->lock);
1376 		in6_ifa_put(ifp);
1377 #ifdef CONFIG_IPV6_PRIVACY
1378 	} else if (ifp->flags&IFA_F_TEMPORARY) {
1379 		struct inet6_ifaddr *ifpub;
1380 		spin_lock_bh(&ifp->lock);
1381 		ifpub = ifp->ifpub;
1382 		if (ifpub) {
1383 			in6_ifa_hold(ifpub);
1384 			spin_unlock_bh(&ifp->lock);
1385 			ipv6_create_tempaddr(ifpub, ifp);
1386 			in6_ifa_put(ifpub);
1387 		} else {
1388 			spin_unlock_bh(&ifp->lock);
1389 		}
1390 		ipv6_del_addr(ifp);
1391 #endif
1392 	} else
1393 		ipv6_del_addr(ifp);
1394 }
1395 
1396 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1397 {
1398 	if (net_ratelimit())
1399 		printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1400 	addrconf_dad_stop(ifp);
1401 }
1402 
1403 /* Join to solicited addr multicast group. */
1404 
1405 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1406 {
1407 	struct in6_addr maddr;
1408 
1409 	if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1410 		return;
1411 
1412 	addrconf_addr_solict_mult(addr, &maddr);
1413 	ipv6_dev_mc_inc(dev, &maddr);
1414 }
1415 
1416 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1417 {
1418 	struct in6_addr maddr;
1419 
1420 	if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1421 		return;
1422 
1423 	addrconf_addr_solict_mult(addr, &maddr);
1424 	__ipv6_dev_mc_dec(idev, &maddr);
1425 }
1426 
1427 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1428 {
1429 	struct in6_addr addr;
1430 	ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1431 	if (ipv6_addr_any(&addr))
1432 		return;
1433 	ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1434 }
1435 
1436 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1437 {
1438 	struct in6_addr addr;
1439 	ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1440 	if (ipv6_addr_any(&addr))
1441 		return;
1442 	__ipv6_dev_ac_dec(ifp->idev, &addr);
1443 }
1444 
1445 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1446 {
1447 	if (dev->addr_len != ETH_ALEN)
1448 		return -1;
1449 	memcpy(eui, dev->dev_addr, 3);
1450 	memcpy(eui + 5, dev->dev_addr + 3, 3);
1451 
1452 	/*
1453 	 * The zSeries OSA network cards can be shared among various
1454 	 * OS instances, but the OSA cards have only one MAC address.
1455 	 * This leads to duplicate address conflicts in conjunction
1456 	 * with IPv6 if more than one instance uses the same card.
1457 	 *
1458 	 * The driver for these cards can deliver a unique 16-bit
1459 	 * identifier for each instance sharing the same card.  It is
1460 	 * placed instead of 0xFFFE in the interface identifier.  The
1461 	 * "u" bit of the interface identifier is not inverted in this
1462 	 * case.  Hence the resulting interface identifier has local
1463 	 * scope according to RFC2373.
1464 	 */
1465 	if (dev->dev_id) {
1466 		eui[3] = (dev->dev_id >> 8) & 0xFF;
1467 		eui[4] = dev->dev_id & 0xFF;
1468 	} else {
1469 		eui[3] = 0xFF;
1470 		eui[4] = 0xFE;
1471 		eui[0] ^= 2;
1472 	}
1473 	return 0;
1474 }
1475 
1476 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1477 {
1478 	/* XXX: inherit EUI-64 from other interface -- yoshfuji */
1479 	if (dev->addr_len != ARCNET_ALEN)
1480 		return -1;
1481 	memset(eui, 0, 7);
1482 	eui[7] = *(u8*)dev->dev_addr;
1483 	return 0;
1484 }
1485 
1486 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1487 {
1488 	if (dev->addr_len != INFINIBAND_ALEN)
1489 		return -1;
1490 	memcpy(eui, dev->dev_addr + 12, 8);
1491 	eui[0] |= 2;
1492 	return 0;
1493 }
1494 
1495 int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1496 {
1497 	eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1498 		  ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1499 		  ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1500 		  ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1501 		  ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1502 		  ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1503 	eui[1] = 0;
1504 	eui[2] = 0x5E;
1505 	eui[3] = 0xFE;
1506 	memcpy(eui + 4, &addr, 4);
1507 	return 0;
1508 }
1509 EXPORT_SYMBOL(__ipv6_isatap_ifid);
1510 
1511 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1512 {
1513 	if (dev->priv_flags & IFF_ISATAP)
1514 		return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1515 	return -1;
1516 }
1517 
1518 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1519 {
1520 	switch (dev->type) {
1521 	case ARPHRD_ETHER:
1522 	case ARPHRD_FDDI:
1523 	case ARPHRD_IEEE802_TR:
1524 		return addrconf_ifid_eui48(eui, dev);
1525 	case ARPHRD_ARCNET:
1526 		return addrconf_ifid_arcnet(eui, dev);
1527 	case ARPHRD_INFINIBAND:
1528 		return addrconf_ifid_infiniband(eui, dev);
1529 	case ARPHRD_SIT:
1530 		return addrconf_ifid_sit(eui, dev);
1531 	}
1532 	return -1;
1533 }
1534 
1535 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1536 {
1537 	int err = -1;
1538 	struct inet6_ifaddr *ifp;
1539 
1540 	read_lock_bh(&idev->lock);
1541 	for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1542 		if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1543 			memcpy(eui, ifp->addr.s6_addr+8, 8);
1544 			err = 0;
1545 			break;
1546 		}
1547 	}
1548 	read_unlock_bh(&idev->lock);
1549 	return err;
1550 }
1551 
1552 #ifdef CONFIG_IPV6_PRIVACY
1553 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1554 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1555 {
1556 regen:
1557 	get_random_bytes(idev->rndid, sizeof(idev->rndid));
1558 	idev->rndid[0] &= ~0x02;
1559 
1560 	/*
1561 	 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1562 	 * check if generated address is not inappropriate
1563 	 *
1564 	 *  - Reserved subnet anycast (RFC 2526)
1565 	 *	11111101 11....11 1xxxxxxx
1566 	 *  - ISATAP (RFC4214) 6.1
1567 	 *	00-00-5E-FE-xx-xx-xx-xx
1568 	 *  - value 0
1569 	 *  - XXX: already assigned to an address on the device
1570 	 */
1571 	if (idev->rndid[0] == 0xfd &&
1572 	    (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1573 	    (idev->rndid[7]&0x80))
1574 		goto regen;
1575 	if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1576 		if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1577 			goto regen;
1578 		if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1579 			goto regen;
1580 	}
1581 
1582 	return 0;
1583 }
1584 
1585 static void ipv6_regen_rndid(unsigned long data)
1586 {
1587 	struct inet6_dev *idev = (struct inet6_dev *) data;
1588 	unsigned long expires;
1589 
1590 	rcu_read_lock_bh();
1591 	write_lock_bh(&idev->lock);
1592 
1593 	if (idev->dead)
1594 		goto out;
1595 
1596 	if (__ipv6_regen_rndid(idev) < 0)
1597 		goto out;
1598 
1599 	expires = jiffies +
1600 		idev->cnf.temp_prefered_lft * HZ -
1601 		idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1602 	if (time_before(expires, jiffies)) {
1603 		printk(KERN_WARNING
1604 			"ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1605 			idev->dev->name);
1606 		goto out;
1607 	}
1608 
1609 	if (!mod_timer(&idev->regen_timer, expires))
1610 		in6_dev_hold(idev);
1611 
1612 out:
1613 	write_unlock_bh(&idev->lock);
1614 	rcu_read_unlock_bh();
1615 	in6_dev_put(idev);
1616 }
1617 
1618 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1619 	int ret = 0;
1620 
1621 	if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1622 		ret = __ipv6_regen_rndid(idev);
1623 	return ret;
1624 }
1625 #endif
1626 
1627 /*
1628  *	Add prefix route.
1629  */
1630 
1631 static void
1632 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1633 		      unsigned long expires, u32 flags)
1634 {
1635 	struct fib6_config cfg = {
1636 		.fc_table = RT6_TABLE_PREFIX,
1637 		.fc_metric = IP6_RT_PRIO_ADDRCONF,
1638 		.fc_ifindex = dev->ifindex,
1639 		.fc_expires = expires,
1640 		.fc_dst_len = plen,
1641 		.fc_flags = RTF_UP | flags,
1642 		.fc_nlinfo.nl_net = dev_net(dev),
1643 	};
1644 
1645 	ipv6_addr_copy(&cfg.fc_dst, pfx);
1646 
1647 	/* Prevent useless cloning on PtP SIT.
1648 	   This thing is done here expecting that the whole
1649 	   class of non-broadcast devices need not cloning.
1650 	 */
1651 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1652 	if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1653 		cfg.fc_flags |= RTF_NONEXTHOP;
1654 #endif
1655 
1656 	ip6_route_add(&cfg);
1657 }
1658 
1659 /* Create "default" multicast route to the interface */
1660 
1661 static void addrconf_add_mroute(struct net_device *dev)
1662 {
1663 	struct fib6_config cfg = {
1664 		.fc_table = RT6_TABLE_LOCAL,
1665 		.fc_metric = IP6_RT_PRIO_ADDRCONF,
1666 		.fc_ifindex = dev->ifindex,
1667 		.fc_dst_len = 8,
1668 		.fc_flags = RTF_UP,
1669 		.fc_nlinfo.nl_net = dev_net(dev),
1670 	};
1671 
1672 	ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1673 
1674 	ip6_route_add(&cfg);
1675 }
1676 
1677 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1678 static void sit_route_add(struct net_device *dev)
1679 {
1680 	struct fib6_config cfg = {
1681 		.fc_table = RT6_TABLE_MAIN,
1682 		.fc_metric = IP6_RT_PRIO_ADDRCONF,
1683 		.fc_ifindex = dev->ifindex,
1684 		.fc_dst_len = 96,
1685 		.fc_flags = RTF_UP | RTF_NONEXTHOP,
1686 		.fc_nlinfo.nl_net = dev_net(dev),
1687 	};
1688 
1689 	/* prefix length - 96 bits "::d.d.d.d" */
1690 	ip6_route_add(&cfg);
1691 }
1692 #endif
1693 
1694 static void addrconf_add_lroute(struct net_device *dev)
1695 {
1696 	struct in6_addr addr;
1697 
1698 	ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
1699 	addrconf_prefix_route(&addr, 64, dev, 0, 0);
1700 }
1701 
1702 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1703 {
1704 	struct inet6_dev *idev;
1705 
1706 	ASSERT_RTNL();
1707 
1708 	if ((idev = ipv6_find_idev(dev)) == NULL)
1709 		return NULL;
1710 
1711 	/* Add default multicast route */
1712 	addrconf_add_mroute(dev);
1713 
1714 	/* Add link local route */
1715 	addrconf_add_lroute(dev);
1716 	return idev;
1717 }
1718 
1719 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1720 {
1721 	struct prefix_info *pinfo;
1722 	__u32 valid_lft;
1723 	__u32 prefered_lft;
1724 	int addr_type;
1725 	unsigned long rt_expires;
1726 	struct inet6_dev *in6_dev;
1727 
1728 	pinfo = (struct prefix_info *) opt;
1729 
1730 	if (len < sizeof(struct prefix_info)) {
1731 		ADBG(("addrconf: prefix option too short\n"));
1732 		return;
1733 	}
1734 
1735 	/*
1736 	 *	Validation checks ([ADDRCONF], page 19)
1737 	 */
1738 
1739 	addr_type = ipv6_addr_type(&pinfo->prefix);
1740 
1741 	if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1742 		return;
1743 
1744 	valid_lft = ntohl(pinfo->valid);
1745 	prefered_lft = ntohl(pinfo->prefered);
1746 
1747 	if (prefered_lft > valid_lft) {
1748 		if (net_ratelimit())
1749 			printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1750 		return;
1751 	}
1752 
1753 	in6_dev = in6_dev_get(dev);
1754 
1755 	if (in6_dev == NULL) {
1756 		if (net_ratelimit())
1757 			printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1758 		return;
1759 	}
1760 
1761 	/*
1762 	 *	Two things going on here:
1763 	 *	1) Add routes for on-link prefixes
1764 	 *	2) Configure prefixes with the auto flag set
1765 	 */
1766 
1767 	/* Avoid arithmetic overflow. Really, we could
1768 	   save rt_expires in seconds, likely valid_lft,
1769 	   but it would require division in fib gc, that it
1770 	   not good.
1771 	 */
1772 	if (valid_lft >= 0x7FFFFFFF/HZ)
1773 		rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ);
1774 	else
1775 		rt_expires = valid_lft * HZ;
1776 
1777 	/*
1778 	 * We convert this (in jiffies) to clock_t later.
1779 	 * Avoid arithmetic overflow there as well.
1780 	 * Overflow can happen only if HZ < USER_HZ.
1781 	 */
1782 	if (HZ < USER_HZ && rt_expires > 0x7FFFFFFF / USER_HZ)
1783 		rt_expires = 0x7FFFFFFF / USER_HZ;
1784 
1785 	if (pinfo->onlink) {
1786 		struct rt6_info *rt;
1787 		rt = rt6_lookup(dev_net(dev), &pinfo->prefix, NULL,
1788 				dev->ifindex, 1);
1789 
1790 		if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
1791 			if (rt->rt6i_flags&RTF_EXPIRES) {
1792 				if (valid_lft == 0) {
1793 					ip6_del_rt(rt);
1794 					rt = NULL;
1795 				} else {
1796 					rt->rt6i_expires = jiffies + rt_expires;
1797 				}
1798 			}
1799 		} else if (valid_lft) {
1800 			addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1801 					      dev, jiffies_to_clock_t(rt_expires), RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT);
1802 		}
1803 		if (rt)
1804 			dst_release(&rt->u.dst);
1805 	}
1806 
1807 	/* Try to figure out our local address for this prefix */
1808 
1809 	if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1810 		struct inet6_ifaddr * ifp;
1811 		struct in6_addr addr;
1812 		int create = 0, update_lft = 0;
1813 
1814 		if (pinfo->prefix_len == 64) {
1815 			memcpy(&addr, &pinfo->prefix, 8);
1816 			if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1817 			    ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1818 				in6_dev_put(in6_dev);
1819 				return;
1820 			}
1821 			goto ok;
1822 		}
1823 		if (net_ratelimit())
1824 			printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1825 			       pinfo->prefix_len);
1826 		in6_dev_put(in6_dev);
1827 		return;
1828 
1829 ok:
1830 
1831 		ifp = ipv6_get_ifaddr(dev_net(dev), &addr, dev, 1);
1832 
1833 		if (ifp == NULL && valid_lft) {
1834 			int max_addresses = in6_dev->cnf.max_addresses;
1835 			u32 addr_flags = 0;
1836 
1837 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1838 			if (in6_dev->cnf.optimistic_dad &&
1839 			    !ipv6_devconf.forwarding)
1840 				addr_flags = IFA_F_OPTIMISTIC;
1841 #endif
1842 
1843 			/* Do not allow to create too much of autoconfigured
1844 			 * addresses; this would be too easy way to crash kernel.
1845 			 */
1846 			if (!max_addresses ||
1847 			    ipv6_count_addresses(in6_dev) < max_addresses)
1848 				ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1849 						    addr_type&IPV6_ADDR_SCOPE_MASK,
1850 						    addr_flags);
1851 
1852 			if (!ifp || IS_ERR(ifp)) {
1853 				in6_dev_put(in6_dev);
1854 				return;
1855 			}
1856 
1857 			update_lft = create = 1;
1858 			ifp->cstamp = jiffies;
1859 			addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1860 		}
1861 
1862 		if (ifp) {
1863 			int flags;
1864 			unsigned long now;
1865 #ifdef CONFIG_IPV6_PRIVACY
1866 			struct inet6_ifaddr *ift;
1867 #endif
1868 			u32 stored_lft;
1869 
1870 			/* update lifetime (RFC2462 5.5.3 e) */
1871 			spin_lock(&ifp->lock);
1872 			now = jiffies;
1873 			if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1874 				stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1875 			else
1876 				stored_lft = 0;
1877 			if (!update_lft && stored_lft) {
1878 				if (valid_lft > MIN_VALID_LIFETIME ||
1879 				    valid_lft > stored_lft)
1880 					update_lft = 1;
1881 				else if (stored_lft <= MIN_VALID_LIFETIME) {
1882 					/* valid_lft <= stored_lft is always true */
1883 					/* XXX: IPsec */
1884 					update_lft = 0;
1885 				} else {
1886 					valid_lft = MIN_VALID_LIFETIME;
1887 					if (valid_lft < prefered_lft)
1888 						prefered_lft = valid_lft;
1889 					update_lft = 1;
1890 				}
1891 			}
1892 
1893 			if (update_lft) {
1894 				ifp->valid_lft = valid_lft;
1895 				ifp->prefered_lft = prefered_lft;
1896 				ifp->tstamp = now;
1897 				flags = ifp->flags;
1898 				ifp->flags &= ~IFA_F_DEPRECATED;
1899 				spin_unlock(&ifp->lock);
1900 
1901 				if (!(flags&IFA_F_TENTATIVE))
1902 					ipv6_ifa_notify(0, ifp);
1903 			} else
1904 				spin_unlock(&ifp->lock);
1905 
1906 #ifdef CONFIG_IPV6_PRIVACY
1907 			read_lock_bh(&in6_dev->lock);
1908 			/* update all temporary addresses in the list */
1909 			for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1910 				/*
1911 				 * When adjusting the lifetimes of an existing
1912 				 * temporary address, only lower the lifetimes.
1913 				 * Implementations must not increase the
1914 				 * lifetimes of an existing temporary address
1915 				 * when processing a Prefix Information Option.
1916 				 */
1917 				if (ifp != ift->ifpub)
1918 					continue;
1919 
1920 				spin_lock(&ift->lock);
1921 				flags = ift->flags;
1922 				if (ift->valid_lft > valid_lft &&
1923 				    ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1924 					ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1925 				if (ift->prefered_lft > prefered_lft &&
1926 				    ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1927 					ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1928 				spin_unlock(&ift->lock);
1929 				if (!(flags&IFA_F_TENTATIVE))
1930 					ipv6_ifa_notify(0, ift);
1931 			}
1932 
1933 			if (create && in6_dev->cnf.use_tempaddr > 0) {
1934 				/*
1935 				 * When a new public address is created as described in [ADDRCONF],
1936 				 * also create a new temporary address.
1937 				 */
1938 				read_unlock_bh(&in6_dev->lock);
1939 				ipv6_create_tempaddr(ifp, NULL);
1940 			} else {
1941 				read_unlock_bh(&in6_dev->lock);
1942 			}
1943 #endif
1944 			in6_ifa_put(ifp);
1945 			addrconf_verify(0);
1946 		}
1947 	}
1948 	inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
1949 	in6_dev_put(in6_dev);
1950 }
1951 
1952 /*
1953  *	Set destination address.
1954  *	Special case for SIT interfaces where we create a new "virtual"
1955  *	device.
1956  */
1957 int addrconf_set_dstaddr(struct net *net, void __user *arg)
1958 {
1959 	struct in6_ifreq ireq;
1960 	struct net_device *dev;
1961 	int err = -EINVAL;
1962 
1963 	rtnl_lock();
1964 
1965 	err = -EFAULT;
1966 	if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1967 		goto err_exit;
1968 
1969 	dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
1970 
1971 	err = -ENODEV;
1972 	if (dev == NULL)
1973 		goto err_exit;
1974 
1975 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1976 	if (dev->type == ARPHRD_SIT) {
1977 		struct ifreq ifr;
1978 		mm_segment_t	oldfs;
1979 		struct ip_tunnel_parm p;
1980 
1981 		err = -EADDRNOTAVAIL;
1982 		if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
1983 			goto err_exit;
1984 
1985 		memset(&p, 0, sizeof(p));
1986 		p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
1987 		p.iph.saddr = 0;
1988 		p.iph.version = 4;
1989 		p.iph.ihl = 5;
1990 		p.iph.protocol = IPPROTO_IPV6;
1991 		p.iph.ttl = 64;
1992 		ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1993 
1994 		oldfs = get_fs(); set_fs(KERNEL_DS);
1995 		err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
1996 		set_fs(oldfs);
1997 
1998 		if (err == 0) {
1999 			err = -ENOBUFS;
2000 			dev = __dev_get_by_name(net, p.name);
2001 			if (!dev)
2002 				goto err_exit;
2003 			err = dev_open(dev);
2004 		}
2005 	}
2006 #endif
2007 
2008 err_exit:
2009 	rtnl_unlock();
2010 	return err;
2011 }
2012 
2013 /*
2014  *	Manual configuration of address on an interface
2015  */
2016 static int inet6_addr_add(struct net *net, int ifindex, struct in6_addr *pfx,
2017 			  int plen, __u8 ifa_flags, __u32 prefered_lft,
2018 			  __u32 valid_lft)
2019 {
2020 	struct inet6_ifaddr *ifp;
2021 	struct inet6_dev *idev;
2022 	struct net_device *dev;
2023 	int scope;
2024 	u32 flags = RTF_EXPIRES;
2025 
2026 	ASSERT_RTNL();
2027 
2028 	/* check the lifetime */
2029 	if (!valid_lft || prefered_lft > valid_lft)
2030 		return -EINVAL;
2031 
2032 	dev = __dev_get_by_index(net, ifindex);
2033 	if (!dev)
2034 		return -ENODEV;
2035 
2036 	if ((idev = addrconf_add_dev(dev)) == NULL)
2037 		return -ENOBUFS;
2038 
2039 	scope = ipv6_addr_scope(pfx);
2040 
2041 	if (valid_lft == INFINITY_LIFE_TIME) {
2042 		ifa_flags |= IFA_F_PERMANENT;
2043 		flags = 0;
2044 	} else if (valid_lft >= 0x7FFFFFFF/HZ)
2045 		valid_lft = 0x7FFFFFFF/HZ;
2046 
2047 	if (prefered_lft == 0)
2048 		ifa_flags |= IFA_F_DEPRECATED;
2049 	else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
2050 		 (prefered_lft != INFINITY_LIFE_TIME))
2051 		prefered_lft = 0x7FFFFFFF/HZ;
2052 
2053 	ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2054 
2055 	if (!IS_ERR(ifp)) {
2056 		spin_lock_bh(&ifp->lock);
2057 		ifp->valid_lft = valid_lft;
2058 		ifp->prefered_lft = prefered_lft;
2059 		ifp->tstamp = jiffies;
2060 		spin_unlock_bh(&ifp->lock);
2061 
2062 		addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2063 				      jiffies_to_clock_t(valid_lft * HZ), flags);
2064 		/*
2065 		 * Note that section 3.1 of RFC 4429 indicates
2066 		 * that the Optimistic flag should not be set for
2067 		 * manually configured addresses
2068 		 */
2069 		addrconf_dad_start(ifp, 0);
2070 		in6_ifa_put(ifp);
2071 		addrconf_verify(0);
2072 		return 0;
2073 	}
2074 
2075 	return PTR_ERR(ifp);
2076 }
2077 
2078 static int inet6_addr_del(struct net *net, int ifindex, struct in6_addr *pfx,
2079 			  int plen)
2080 {
2081 	struct inet6_ifaddr *ifp;
2082 	struct inet6_dev *idev;
2083 	struct net_device *dev;
2084 
2085 	dev = __dev_get_by_index(net, ifindex);
2086 	if (!dev)
2087 		return -ENODEV;
2088 
2089 	if ((idev = __in6_dev_get(dev)) == NULL)
2090 		return -ENXIO;
2091 
2092 	read_lock_bh(&idev->lock);
2093 	for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
2094 		if (ifp->prefix_len == plen &&
2095 		    ipv6_addr_equal(pfx, &ifp->addr)) {
2096 			in6_ifa_hold(ifp);
2097 			read_unlock_bh(&idev->lock);
2098 
2099 			ipv6_del_addr(ifp);
2100 
2101 			/* If the last address is deleted administratively,
2102 			   disable IPv6 on this interface.
2103 			 */
2104 			if (idev->addr_list == NULL)
2105 				addrconf_ifdown(idev->dev, 1);
2106 			return 0;
2107 		}
2108 	}
2109 	read_unlock_bh(&idev->lock);
2110 	return -EADDRNOTAVAIL;
2111 }
2112 
2113 
2114 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2115 {
2116 	struct in6_ifreq ireq;
2117 	int err;
2118 
2119 	if (!capable(CAP_NET_ADMIN))
2120 		return -EPERM;
2121 
2122 	if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2123 		return -EFAULT;
2124 
2125 	rtnl_lock();
2126 	err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2127 			     ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2128 			     INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2129 	rtnl_unlock();
2130 	return err;
2131 }
2132 
2133 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2134 {
2135 	struct in6_ifreq ireq;
2136 	int err;
2137 
2138 	if (!capable(CAP_NET_ADMIN))
2139 		return -EPERM;
2140 
2141 	if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2142 		return -EFAULT;
2143 
2144 	rtnl_lock();
2145 	err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2146 			     ireq.ifr6_prefixlen);
2147 	rtnl_unlock();
2148 	return err;
2149 }
2150 
2151 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2152 static void sit_add_v4_addrs(struct inet6_dev *idev)
2153 {
2154 	struct inet6_ifaddr * ifp;
2155 	struct in6_addr addr;
2156 	struct net_device *dev;
2157 	struct net *net = dev_net(idev->dev);
2158 	int scope;
2159 
2160 	ASSERT_RTNL();
2161 
2162 	memset(&addr, 0, sizeof(struct in6_addr));
2163 	memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2164 
2165 	if (idev->dev->flags&IFF_POINTOPOINT) {
2166 		addr.s6_addr32[0] = htonl(0xfe800000);
2167 		scope = IFA_LINK;
2168 	} else {
2169 		scope = IPV6_ADDR_COMPATv4;
2170 	}
2171 
2172 	if (addr.s6_addr32[3]) {
2173 		ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
2174 		if (!IS_ERR(ifp)) {
2175 			spin_lock_bh(&ifp->lock);
2176 			ifp->flags &= ~IFA_F_TENTATIVE;
2177 			spin_unlock_bh(&ifp->lock);
2178 			ipv6_ifa_notify(RTM_NEWADDR, ifp);
2179 			in6_ifa_put(ifp);
2180 		}
2181 		return;
2182 	}
2183 
2184 	for_each_netdev(net, dev) {
2185 		struct in_device * in_dev = __in_dev_get_rtnl(dev);
2186 		if (in_dev && (dev->flags & IFF_UP)) {
2187 			struct in_ifaddr * ifa;
2188 
2189 			int flag = scope;
2190 
2191 			for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2192 				int plen;
2193 
2194 				addr.s6_addr32[3] = ifa->ifa_local;
2195 
2196 				if (ifa->ifa_scope == RT_SCOPE_LINK)
2197 					continue;
2198 				if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2199 					if (idev->dev->flags&IFF_POINTOPOINT)
2200 						continue;
2201 					flag |= IFA_HOST;
2202 				}
2203 				if (idev->dev->flags&IFF_POINTOPOINT)
2204 					plen = 64;
2205 				else
2206 					plen = 96;
2207 
2208 				ifp = ipv6_add_addr(idev, &addr, plen, flag,
2209 						    IFA_F_PERMANENT);
2210 				if (!IS_ERR(ifp)) {
2211 					spin_lock_bh(&ifp->lock);
2212 					ifp->flags &= ~IFA_F_TENTATIVE;
2213 					spin_unlock_bh(&ifp->lock);
2214 					ipv6_ifa_notify(RTM_NEWADDR, ifp);
2215 					in6_ifa_put(ifp);
2216 				}
2217 			}
2218 		}
2219 	}
2220 }
2221 #endif
2222 
2223 static void init_loopback(struct net_device *dev)
2224 {
2225 	struct inet6_dev  *idev;
2226 	struct inet6_ifaddr * ifp;
2227 
2228 	/* ::1 */
2229 
2230 	ASSERT_RTNL();
2231 
2232 	if ((idev = ipv6_find_idev(dev)) == NULL) {
2233 		printk(KERN_DEBUG "init loopback: add_dev failed\n");
2234 		return;
2235 	}
2236 
2237 	ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
2238 	if (!IS_ERR(ifp)) {
2239 		spin_lock_bh(&ifp->lock);
2240 		ifp->flags &= ~IFA_F_TENTATIVE;
2241 		spin_unlock_bh(&ifp->lock);
2242 		ipv6_ifa_notify(RTM_NEWADDR, ifp);
2243 		in6_ifa_put(ifp);
2244 	}
2245 }
2246 
2247 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2248 {
2249 	struct inet6_ifaddr * ifp;
2250 	u32 addr_flags = IFA_F_PERMANENT;
2251 
2252 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2253 	if (idev->cnf.optimistic_dad &&
2254 	    !ipv6_devconf.forwarding)
2255 		addr_flags |= IFA_F_OPTIMISTIC;
2256 #endif
2257 
2258 
2259 	ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2260 	if (!IS_ERR(ifp)) {
2261 		addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2262 		addrconf_dad_start(ifp, 0);
2263 		in6_ifa_put(ifp);
2264 	}
2265 }
2266 
2267 static void addrconf_dev_config(struct net_device *dev)
2268 {
2269 	struct in6_addr addr;
2270 	struct inet6_dev    * idev;
2271 
2272 	ASSERT_RTNL();
2273 
2274 	if ((dev->type != ARPHRD_ETHER) &&
2275 	    (dev->type != ARPHRD_FDDI) &&
2276 	    (dev->type != ARPHRD_IEEE802_TR) &&
2277 	    (dev->type != ARPHRD_ARCNET) &&
2278 	    (dev->type != ARPHRD_INFINIBAND)) {
2279 		/* Alas, we support only Ethernet autoconfiguration. */
2280 		return;
2281 	}
2282 
2283 	idev = addrconf_add_dev(dev);
2284 	if (idev == NULL)
2285 		return;
2286 
2287 	memset(&addr, 0, sizeof(struct in6_addr));
2288 	addr.s6_addr32[0] = htonl(0xFE800000);
2289 
2290 	if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2291 		addrconf_add_linklocal(idev, &addr);
2292 }
2293 
2294 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2295 static void addrconf_sit_config(struct net_device *dev)
2296 {
2297 	struct inet6_dev *idev;
2298 
2299 	ASSERT_RTNL();
2300 
2301 	/*
2302 	 * Configure the tunnel with one of our IPv4
2303 	 * addresses... we should configure all of
2304 	 * our v4 addrs in the tunnel
2305 	 */
2306 
2307 	if ((idev = ipv6_find_idev(dev)) == NULL) {
2308 		printk(KERN_DEBUG "init sit: add_dev failed\n");
2309 		return;
2310 	}
2311 
2312 	if (dev->priv_flags & IFF_ISATAP) {
2313 		struct in6_addr addr;
2314 
2315 		ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
2316 		addrconf_prefix_route(&addr, 64, dev, 0, 0);
2317 		if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2318 			addrconf_add_linklocal(idev, &addr);
2319 		return;
2320 	}
2321 
2322 	sit_add_v4_addrs(idev);
2323 
2324 	if (dev->flags&IFF_POINTOPOINT) {
2325 		addrconf_add_mroute(dev);
2326 		addrconf_add_lroute(dev);
2327 	} else
2328 		sit_route_add(dev);
2329 }
2330 #endif
2331 
2332 static inline int
2333 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2334 {
2335 	struct in6_addr lladdr;
2336 
2337 	if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2338 		addrconf_add_linklocal(idev, &lladdr);
2339 		return 0;
2340 	}
2341 	return -1;
2342 }
2343 
2344 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2345 {
2346 	struct net_device *link_dev;
2347 	struct net *net = dev_net(idev->dev);
2348 
2349 	/* first try to inherit the link-local address from the link device */
2350 	if (idev->dev->iflink &&
2351 	    (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
2352 		if (!ipv6_inherit_linklocal(idev, link_dev))
2353 			return;
2354 	}
2355 	/* then try to inherit it from any device */
2356 	for_each_netdev(net, link_dev) {
2357 		if (!ipv6_inherit_linklocal(idev, link_dev))
2358 			return;
2359 	}
2360 	printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2361 }
2362 
2363 /*
2364  * Autoconfigure tunnel with a link-local address so routing protocols,
2365  * DHCPv6, MLD etc. can be run over the virtual link
2366  */
2367 
2368 static void addrconf_ip6_tnl_config(struct net_device *dev)
2369 {
2370 	struct inet6_dev *idev;
2371 
2372 	ASSERT_RTNL();
2373 
2374 	if ((idev = addrconf_add_dev(dev)) == NULL) {
2375 		printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2376 		return;
2377 	}
2378 	ip6_tnl_add_linklocal(idev);
2379 }
2380 
2381 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2382 			   void * data)
2383 {
2384 	struct net_device *dev = (struct net_device *) data;
2385 	struct inet6_dev *idev = __in6_dev_get(dev);
2386 	int run_pending = 0;
2387 	int err;
2388 
2389 	switch(event) {
2390 	case NETDEV_REGISTER:
2391 		if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2392 			idev = ipv6_add_dev(dev);
2393 			if (!idev)
2394 				return notifier_from_errno(-ENOMEM);
2395 		}
2396 		break;
2397 	case NETDEV_UP:
2398 	case NETDEV_CHANGE:
2399 		if (dev->flags & IFF_SLAVE)
2400 			break;
2401 
2402 		if (event == NETDEV_UP) {
2403 			if (!addrconf_qdisc_ok(dev)) {
2404 				/* device is not ready yet. */
2405 				printk(KERN_INFO
2406 					"ADDRCONF(NETDEV_UP): %s: "
2407 					"link is not ready\n",
2408 					dev->name);
2409 				break;
2410 			}
2411 
2412 			if (!idev && dev->mtu >= IPV6_MIN_MTU)
2413 				idev = ipv6_add_dev(dev);
2414 
2415 			if (idev)
2416 				idev->if_flags |= IF_READY;
2417 		} else {
2418 			if (!addrconf_qdisc_ok(dev)) {
2419 				/* device is still not ready. */
2420 				break;
2421 			}
2422 
2423 			if (idev) {
2424 				if (idev->if_flags & IF_READY) {
2425 					/* device is already configured. */
2426 					break;
2427 				}
2428 				idev->if_flags |= IF_READY;
2429 			}
2430 
2431 			printk(KERN_INFO
2432 					"ADDRCONF(NETDEV_CHANGE): %s: "
2433 					"link becomes ready\n",
2434 					dev->name);
2435 
2436 			run_pending = 1;
2437 		}
2438 
2439 		switch(dev->type) {
2440 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2441 		case ARPHRD_SIT:
2442 			addrconf_sit_config(dev);
2443 			break;
2444 #endif
2445 		case ARPHRD_TUNNEL6:
2446 			addrconf_ip6_tnl_config(dev);
2447 			break;
2448 		case ARPHRD_LOOPBACK:
2449 			init_loopback(dev);
2450 			break;
2451 
2452 		default:
2453 			addrconf_dev_config(dev);
2454 			break;
2455 		}
2456 		if (idev) {
2457 			if (run_pending)
2458 				addrconf_dad_run(idev);
2459 
2460 			/* If the MTU changed during the interface down, when the
2461 			   interface up, the changed MTU must be reflected in the
2462 			   idev as well as routers.
2463 			 */
2464 			if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2465 				rt6_mtu_change(dev, dev->mtu);
2466 				idev->cnf.mtu6 = dev->mtu;
2467 			}
2468 			idev->tstamp = jiffies;
2469 			inet6_ifinfo_notify(RTM_NEWLINK, idev);
2470 			/* If the changed mtu during down is lower than IPV6_MIN_MTU
2471 			   stop IPv6 on this interface.
2472 			 */
2473 			if (dev->mtu < IPV6_MIN_MTU)
2474 				addrconf_ifdown(dev, event != NETDEV_DOWN);
2475 		}
2476 		break;
2477 
2478 	case NETDEV_CHANGEMTU:
2479 		if (idev && dev->mtu >= IPV6_MIN_MTU) {
2480 			rt6_mtu_change(dev, dev->mtu);
2481 			idev->cnf.mtu6 = dev->mtu;
2482 			break;
2483 		}
2484 
2485 		if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2486 			idev = ipv6_add_dev(dev);
2487 			if (idev)
2488 				break;
2489 		}
2490 
2491 		/* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2492 
2493 	case NETDEV_DOWN:
2494 	case NETDEV_UNREGISTER:
2495 		/*
2496 		 *	Remove all addresses from this interface.
2497 		 */
2498 		addrconf_ifdown(dev, event != NETDEV_DOWN);
2499 		break;
2500 
2501 	case NETDEV_CHANGENAME:
2502 		if (idev) {
2503 			snmp6_unregister_dev(idev);
2504 			addrconf_sysctl_unregister(idev);
2505 			addrconf_sysctl_register(idev);
2506 			err = snmp6_register_dev(idev);
2507 			if (err)
2508 				return notifier_from_errno(err);
2509 		}
2510 		break;
2511 	}
2512 
2513 	return NOTIFY_OK;
2514 }
2515 
2516 /*
2517  *	addrconf module should be notified of a device going up
2518  */
2519 static struct notifier_block ipv6_dev_notf = {
2520 	.notifier_call = addrconf_notify,
2521 	.priority = 0
2522 };
2523 
2524 static int addrconf_ifdown(struct net_device *dev, int how)
2525 {
2526 	struct inet6_dev *idev;
2527 	struct inet6_ifaddr *ifa, **bifa;
2528 	struct net *net = dev_net(dev);
2529 	int i;
2530 
2531 	ASSERT_RTNL();
2532 
2533 	if ((dev->flags & IFF_LOOPBACK) && how == 1)
2534 		how = 0;
2535 
2536 	rt6_ifdown(net, dev);
2537 	neigh_ifdown(&nd_tbl, dev);
2538 
2539 	idev = __in6_dev_get(dev);
2540 	if (idev == NULL)
2541 		return -ENODEV;
2542 
2543 	/* Step 1: remove reference to ipv6 device from parent device.
2544 		   Do not dev_put!
2545 	 */
2546 	if (how) {
2547 		idev->dead = 1;
2548 
2549 		/* protected by rtnl_lock */
2550 		rcu_assign_pointer(dev->ip6_ptr, NULL);
2551 
2552 		/* Step 1.5: remove snmp6 entry */
2553 		snmp6_unregister_dev(idev);
2554 
2555 	}
2556 
2557 	/* Step 2: clear hash table */
2558 	for (i=0; i<IN6_ADDR_HSIZE; i++) {
2559 		bifa = &inet6_addr_lst[i];
2560 
2561 		write_lock_bh(&addrconf_hash_lock);
2562 		while ((ifa = *bifa) != NULL) {
2563 			if (ifa->idev == idev) {
2564 				*bifa = ifa->lst_next;
2565 				ifa->lst_next = NULL;
2566 				addrconf_del_timer(ifa);
2567 				in6_ifa_put(ifa);
2568 				continue;
2569 			}
2570 			bifa = &ifa->lst_next;
2571 		}
2572 		write_unlock_bh(&addrconf_hash_lock);
2573 	}
2574 
2575 	write_lock_bh(&idev->lock);
2576 
2577 	/* Step 3: clear flags for stateless addrconf */
2578 	if (!how)
2579 		idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2580 
2581 	/* Step 4: clear address list */
2582 #ifdef CONFIG_IPV6_PRIVACY
2583 	if (how && del_timer(&idev->regen_timer))
2584 		in6_dev_put(idev);
2585 
2586 	/* clear tempaddr list */
2587 	while ((ifa = idev->tempaddr_list) != NULL) {
2588 		idev->tempaddr_list = ifa->tmp_next;
2589 		ifa->tmp_next = NULL;
2590 		ifa->dead = 1;
2591 		write_unlock_bh(&idev->lock);
2592 		spin_lock_bh(&ifa->lock);
2593 
2594 		if (ifa->ifpub) {
2595 			in6_ifa_put(ifa->ifpub);
2596 			ifa->ifpub = NULL;
2597 		}
2598 		spin_unlock_bh(&ifa->lock);
2599 		in6_ifa_put(ifa);
2600 		write_lock_bh(&idev->lock);
2601 	}
2602 #endif
2603 	while ((ifa = idev->addr_list) != NULL) {
2604 		idev->addr_list = ifa->if_next;
2605 		ifa->if_next = NULL;
2606 		ifa->dead = 1;
2607 		addrconf_del_timer(ifa);
2608 		write_unlock_bh(&idev->lock);
2609 
2610 		__ipv6_ifa_notify(RTM_DELADDR, ifa);
2611 		atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2612 		in6_ifa_put(ifa);
2613 
2614 		write_lock_bh(&idev->lock);
2615 	}
2616 	write_unlock_bh(&idev->lock);
2617 
2618 	/* Step 5: Discard multicast list */
2619 
2620 	if (how)
2621 		ipv6_mc_destroy_dev(idev);
2622 	else
2623 		ipv6_mc_down(idev);
2624 
2625 	idev->tstamp = jiffies;
2626 
2627 	/* Shot the device (if unregistered) */
2628 
2629 	if (how) {
2630 		addrconf_sysctl_unregister(idev);
2631 		neigh_parms_release(&nd_tbl, idev->nd_parms);
2632 		neigh_ifdown(&nd_tbl, dev);
2633 		in6_dev_put(idev);
2634 	}
2635 	return 0;
2636 }
2637 
2638 static void addrconf_rs_timer(unsigned long data)
2639 {
2640 	struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2641 
2642 	if (ifp->idev->cnf.forwarding)
2643 		goto out;
2644 
2645 	if (ifp->idev->if_flags & IF_RA_RCVD) {
2646 		/*
2647 		 *	Announcement received after solicitation
2648 		 *	was sent
2649 		 */
2650 		goto out;
2651 	}
2652 
2653 	spin_lock(&ifp->lock);
2654 	if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2655 		/* The wait after the last probe can be shorter */
2656 		addrconf_mod_timer(ifp, AC_RS,
2657 				   (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2658 				   ifp->idev->cnf.rtr_solicit_delay :
2659 				   ifp->idev->cnf.rtr_solicit_interval);
2660 		spin_unlock(&ifp->lock);
2661 
2662 		ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2663 	} else {
2664 		spin_unlock(&ifp->lock);
2665 		/*
2666 		 * Note: we do not support deprecated "all on-link"
2667 		 * assumption any longer.
2668 		 */
2669 		printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2670 		       ifp->idev->dev->name);
2671 	}
2672 
2673 out:
2674 	in6_ifa_put(ifp);
2675 }
2676 
2677 /*
2678  *	Duplicate Address Detection
2679  */
2680 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2681 {
2682 	unsigned long rand_num;
2683 	struct inet6_dev *idev = ifp->idev;
2684 
2685 	if (ifp->flags & IFA_F_OPTIMISTIC)
2686 		rand_num = 0;
2687 	else
2688 		rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2689 
2690 	ifp->probes = idev->cnf.dad_transmits;
2691 	addrconf_mod_timer(ifp, AC_DAD, rand_num);
2692 }
2693 
2694 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2695 {
2696 	struct inet6_dev *idev = ifp->idev;
2697 	struct net_device *dev = idev->dev;
2698 
2699 	addrconf_join_solict(dev, &ifp->addr);
2700 
2701 	net_srandom(ifp->addr.s6_addr32[3]);
2702 
2703 	read_lock_bh(&idev->lock);
2704 	if (ifp->dead)
2705 		goto out;
2706 	spin_lock_bh(&ifp->lock);
2707 
2708 	if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2709 	    !(ifp->flags&IFA_F_TENTATIVE) ||
2710 	    ifp->flags & IFA_F_NODAD) {
2711 		ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
2712 		spin_unlock_bh(&ifp->lock);
2713 		read_unlock_bh(&idev->lock);
2714 
2715 		addrconf_dad_completed(ifp);
2716 		return;
2717 	}
2718 
2719 	if (!(idev->if_flags & IF_READY)) {
2720 		spin_unlock_bh(&ifp->lock);
2721 		read_unlock_bh(&idev->lock);
2722 		/*
2723 		 * If the defice is not ready:
2724 		 * - keep it tentative if it is a permanent address.
2725 		 * - otherwise, kill it.
2726 		 */
2727 		in6_ifa_hold(ifp);
2728 		addrconf_dad_stop(ifp);
2729 		return;
2730 	}
2731 
2732 	/*
2733 	 * Optimistic nodes can start receiving
2734 	 * Frames right away
2735 	 */
2736 	if(ifp->flags & IFA_F_OPTIMISTIC)
2737 		ip6_ins_rt(ifp->rt);
2738 
2739 	addrconf_dad_kick(ifp);
2740 	spin_unlock_bh(&ifp->lock);
2741 out:
2742 	read_unlock_bh(&idev->lock);
2743 }
2744 
2745 static void addrconf_dad_timer(unsigned long data)
2746 {
2747 	struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2748 	struct inet6_dev *idev = ifp->idev;
2749 	struct in6_addr mcaddr;
2750 
2751 	read_lock_bh(&idev->lock);
2752 	if (idev->dead) {
2753 		read_unlock_bh(&idev->lock);
2754 		goto out;
2755 	}
2756 	spin_lock_bh(&ifp->lock);
2757 	if (ifp->probes == 0) {
2758 		/*
2759 		 * DAD was successful
2760 		 */
2761 
2762 		ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
2763 		spin_unlock_bh(&ifp->lock);
2764 		read_unlock_bh(&idev->lock);
2765 
2766 		addrconf_dad_completed(ifp);
2767 
2768 		goto out;
2769 	}
2770 
2771 	ifp->probes--;
2772 	addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2773 	spin_unlock_bh(&ifp->lock);
2774 	read_unlock_bh(&idev->lock);
2775 
2776 	/* send a neighbour solicitation for our addr */
2777 	addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2778 	ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
2779 out:
2780 	in6_ifa_put(ifp);
2781 }
2782 
2783 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2784 {
2785 	struct net_device *	dev = ifp->idev->dev;
2786 
2787 	/*
2788 	 *	Configure the address for reception. Now it is valid.
2789 	 */
2790 
2791 	ipv6_ifa_notify(RTM_NEWADDR, ifp);
2792 
2793 	/* If added prefix is link local and forwarding is off,
2794 	   start sending router solicitations.
2795 	 */
2796 
2797 	if (ifp->idev->cnf.forwarding == 0 &&
2798 	    ifp->idev->cnf.rtr_solicits > 0 &&
2799 	    (dev->flags&IFF_LOOPBACK) == 0 &&
2800 	    (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2801 		/*
2802 		 *	If a host as already performed a random delay
2803 		 *	[...] as part of DAD [...] there is no need
2804 		 *	to delay again before sending the first RS
2805 		 */
2806 		ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2807 
2808 		spin_lock_bh(&ifp->lock);
2809 		ifp->probes = 1;
2810 		ifp->idev->if_flags |= IF_RS_SENT;
2811 		addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2812 		spin_unlock_bh(&ifp->lock);
2813 	}
2814 }
2815 
2816 static void addrconf_dad_run(struct inet6_dev *idev) {
2817 	struct inet6_ifaddr *ifp;
2818 
2819 	read_lock_bh(&idev->lock);
2820 	for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2821 		spin_lock_bh(&ifp->lock);
2822 		if (!(ifp->flags & IFA_F_TENTATIVE)) {
2823 			spin_unlock_bh(&ifp->lock);
2824 			continue;
2825 		}
2826 		spin_unlock_bh(&ifp->lock);
2827 		addrconf_dad_kick(ifp);
2828 	}
2829 	read_unlock_bh(&idev->lock);
2830 }
2831 
2832 #ifdef CONFIG_PROC_FS
2833 struct if6_iter_state {
2834 	struct seq_net_private p;
2835 	int bucket;
2836 };
2837 
2838 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2839 {
2840 	struct inet6_ifaddr *ifa = NULL;
2841 	struct if6_iter_state *state = seq->private;
2842 	struct net *net = seq_file_net(seq);
2843 
2844 	for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2845 		ifa = inet6_addr_lst[state->bucket];
2846 
2847 		while (ifa && !net_eq(dev_net(ifa->idev->dev), net))
2848 			ifa = ifa->lst_next;
2849 		if (ifa)
2850 			break;
2851 	}
2852 	return ifa;
2853 }
2854 
2855 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2856 {
2857 	struct if6_iter_state *state = seq->private;
2858 	struct net *net = seq_file_net(seq);
2859 
2860 	ifa = ifa->lst_next;
2861 try_again:
2862 	if (ifa) {
2863 		if (!net_eq(dev_net(ifa->idev->dev), net)) {
2864 			ifa = ifa->lst_next;
2865 			goto try_again;
2866 		}
2867 	}
2868 
2869 	if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2870 		ifa = inet6_addr_lst[state->bucket];
2871 		goto try_again;
2872 	}
2873 
2874 	return ifa;
2875 }
2876 
2877 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2878 {
2879 	struct inet6_ifaddr *ifa = if6_get_first(seq);
2880 
2881 	if (ifa)
2882 		while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2883 			--pos;
2884 	return pos ? NULL : ifa;
2885 }
2886 
2887 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2888 	__acquires(addrconf_hash_lock)
2889 {
2890 	read_lock_bh(&addrconf_hash_lock);
2891 	return if6_get_idx(seq, *pos);
2892 }
2893 
2894 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2895 {
2896 	struct inet6_ifaddr *ifa;
2897 
2898 	ifa = if6_get_next(seq, v);
2899 	++*pos;
2900 	return ifa;
2901 }
2902 
2903 static void if6_seq_stop(struct seq_file *seq, void *v)
2904 	__releases(addrconf_hash_lock)
2905 {
2906 	read_unlock_bh(&addrconf_hash_lock);
2907 }
2908 
2909 static int if6_seq_show(struct seq_file *seq, void *v)
2910 {
2911 	struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2912 	seq_printf(seq,
2913 		   NIP6_SEQFMT " %02x %02x %02x %02x %8s\n",
2914 		   NIP6(ifp->addr),
2915 		   ifp->idev->dev->ifindex,
2916 		   ifp->prefix_len,
2917 		   ifp->scope,
2918 		   ifp->flags,
2919 		   ifp->idev->dev->name);
2920 	return 0;
2921 }
2922 
2923 static const struct seq_operations if6_seq_ops = {
2924 	.start	= if6_seq_start,
2925 	.next	= if6_seq_next,
2926 	.show	= if6_seq_show,
2927 	.stop	= if6_seq_stop,
2928 };
2929 
2930 static int if6_seq_open(struct inode *inode, struct file *file)
2931 {
2932 	return seq_open_net(inode, file, &if6_seq_ops,
2933 			    sizeof(struct if6_iter_state));
2934 }
2935 
2936 static const struct file_operations if6_fops = {
2937 	.owner		= THIS_MODULE,
2938 	.open		= if6_seq_open,
2939 	.read		= seq_read,
2940 	.llseek		= seq_lseek,
2941 	.release	= seq_release_net,
2942 };
2943 
2944 static int if6_proc_net_init(struct net *net)
2945 {
2946 	if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
2947 		return -ENOMEM;
2948 	return 0;
2949 }
2950 
2951 static void if6_proc_net_exit(struct net *net)
2952 {
2953        proc_net_remove(net, "if_inet6");
2954 }
2955 
2956 static struct pernet_operations if6_proc_net_ops = {
2957        .init = if6_proc_net_init,
2958        .exit = if6_proc_net_exit,
2959 };
2960 
2961 int __init if6_proc_init(void)
2962 {
2963 	return register_pernet_subsys(&if6_proc_net_ops);
2964 }
2965 
2966 void if6_proc_exit(void)
2967 {
2968 	unregister_pernet_subsys(&if6_proc_net_ops);
2969 }
2970 #endif	/* CONFIG_PROC_FS */
2971 
2972 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
2973 /* Check if address is a home address configured on any interface. */
2974 int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr)
2975 {
2976 	int ret = 0;
2977 	struct inet6_ifaddr * ifp;
2978 	u8 hash = ipv6_addr_hash(addr);
2979 	read_lock_bh(&addrconf_hash_lock);
2980 	for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) {
2981 		if (!net_eq(dev_net(ifp->idev->dev), net))
2982 			continue;
2983 		if (ipv6_addr_equal(&ifp->addr, addr) &&
2984 		    (ifp->flags & IFA_F_HOMEADDRESS)) {
2985 			ret = 1;
2986 			break;
2987 		}
2988 	}
2989 	read_unlock_bh(&addrconf_hash_lock);
2990 	return ret;
2991 }
2992 #endif
2993 
2994 /*
2995  *	Periodic address status verification
2996  */
2997 
2998 static void addrconf_verify(unsigned long foo)
2999 {
3000 	struct inet6_ifaddr *ifp;
3001 	unsigned long now, next;
3002 	int i;
3003 
3004 	spin_lock_bh(&addrconf_verify_lock);
3005 	now = jiffies;
3006 	next = now + ADDR_CHECK_FREQUENCY;
3007 
3008 	del_timer(&addr_chk_timer);
3009 
3010 	for (i=0; i < IN6_ADDR_HSIZE; i++) {
3011 
3012 restart:
3013 		read_lock(&addrconf_hash_lock);
3014 		for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
3015 			unsigned long age;
3016 #ifdef CONFIG_IPV6_PRIVACY
3017 			unsigned long regen_advance;
3018 #endif
3019 
3020 			if (ifp->flags & IFA_F_PERMANENT)
3021 				continue;
3022 
3023 			spin_lock(&ifp->lock);
3024 			age = (now - ifp->tstamp) / HZ;
3025 
3026 #ifdef CONFIG_IPV6_PRIVACY
3027 			regen_advance = ifp->idev->cnf.regen_max_retry *
3028 					ifp->idev->cnf.dad_transmits *
3029 					ifp->idev->nd_parms->retrans_time / HZ;
3030 #endif
3031 
3032 			if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3033 			    age >= ifp->valid_lft) {
3034 				spin_unlock(&ifp->lock);
3035 				in6_ifa_hold(ifp);
3036 				read_unlock(&addrconf_hash_lock);
3037 				ipv6_del_addr(ifp);
3038 				goto restart;
3039 			} else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3040 				spin_unlock(&ifp->lock);
3041 				continue;
3042 			} else if (age >= ifp->prefered_lft) {
3043 				/* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
3044 				int deprecate = 0;
3045 
3046 				if (!(ifp->flags&IFA_F_DEPRECATED)) {
3047 					deprecate = 1;
3048 					ifp->flags |= IFA_F_DEPRECATED;
3049 				}
3050 
3051 				if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3052 					next = ifp->tstamp + ifp->valid_lft * HZ;
3053 
3054 				spin_unlock(&ifp->lock);
3055 
3056 				if (deprecate) {
3057 					in6_ifa_hold(ifp);
3058 					read_unlock(&addrconf_hash_lock);
3059 
3060 					ipv6_ifa_notify(0, ifp);
3061 					in6_ifa_put(ifp);
3062 					goto restart;
3063 				}
3064 #ifdef CONFIG_IPV6_PRIVACY
3065 			} else if ((ifp->flags&IFA_F_TEMPORARY) &&
3066 				   !(ifp->flags&IFA_F_TENTATIVE)) {
3067 				if (age >= ifp->prefered_lft - regen_advance) {
3068 					struct inet6_ifaddr *ifpub = ifp->ifpub;
3069 					if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3070 						next = ifp->tstamp + ifp->prefered_lft * HZ;
3071 					if (!ifp->regen_count && ifpub) {
3072 						ifp->regen_count++;
3073 						in6_ifa_hold(ifp);
3074 						in6_ifa_hold(ifpub);
3075 						spin_unlock(&ifp->lock);
3076 						read_unlock(&addrconf_hash_lock);
3077 						spin_lock(&ifpub->lock);
3078 						ifpub->regen_count = 0;
3079 						spin_unlock(&ifpub->lock);
3080 						ipv6_create_tempaddr(ifpub, ifp);
3081 						in6_ifa_put(ifpub);
3082 						in6_ifa_put(ifp);
3083 						goto restart;
3084 					}
3085 				} else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3086 					next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3087 				spin_unlock(&ifp->lock);
3088 #endif
3089 			} else {
3090 				/* ifp->prefered_lft <= ifp->valid_lft */
3091 				if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3092 					next = ifp->tstamp + ifp->prefered_lft * HZ;
3093 				spin_unlock(&ifp->lock);
3094 			}
3095 		}
3096 		read_unlock(&addrconf_hash_lock);
3097 	}
3098 
3099 	addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
3100 	add_timer(&addr_chk_timer);
3101 	spin_unlock_bh(&addrconf_verify_lock);
3102 }
3103 
3104 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3105 {
3106 	struct in6_addr *pfx = NULL;
3107 
3108 	if (addr)
3109 		pfx = nla_data(addr);
3110 
3111 	if (local) {
3112 		if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3113 			pfx = NULL;
3114 		else
3115 			pfx = nla_data(local);
3116 	}
3117 
3118 	return pfx;
3119 }
3120 
3121 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3122 	[IFA_ADDRESS]		= { .len = sizeof(struct in6_addr) },
3123 	[IFA_LOCAL]		= { .len = sizeof(struct in6_addr) },
3124 	[IFA_CACHEINFO]		= { .len = sizeof(struct ifa_cacheinfo) },
3125 };
3126 
3127 static int
3128 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3129 {
3130 	struct net *net = sock_net(skb->sk);
3131 	struct ifaddrmsg *ifm;
3132 	struct nlattr *tb[IFA_MAX+1];
3133 	struct in6_addr *pfx;
3134 	int err;
3135 
3136 	err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3137 	if (err < 0)
3138 		return err;
3139 
3140 	ifm = nlmsg_data(nlh);
3141 	pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3142 	if (pfx == NULL)
3143 		return -EINVAL;
3144 
3145 	return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3146 }
3147 
3148 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3149 			     u32 prefered_lft, u32 valid_lft)
3150 {
3151 	u32 flags = RTF_EXPIRES;
3152 
3153 	if (!valid_lft || (prefered_lft > valid_lft))
3154 		return -EINVAL;
3155 
3156 	if (valid_lft == INFINITY_LIFE_TIME) {
3157 		ifa_flags |= IFA_F_PERMANENT;
3158 		flags = 0;
3159 	} else if (valid_lft >= 0x7FFFFFFF/HZ)
3160 		valid_lft = 0x7FFFFFFF/HZ;
3161 
3162 	if (prefered_lft == 0)
3163 		ifa_flags |= IFA_F_DEPRECATED;
3164 	else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
3165 		 (prefered_lft != INFINITY_LIFE_TIME))
3166 		prefered_lft = 0x7FFFFFFF/HZ;
3167 
3168 	spin_lock_bh(&ifp->lock);
3169 	ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3170 	ifp->tstamp = jiffies;
3171 	ifp->valid_lft = valid_lft;
3172 	ifp->prefered_lft = prefered_lft;
3173 
3174 	spin_unlock_bh(&ifp->lock);
3175 	if (!(ifp->flags&IFA_F_TENTATIVE))
3176 		ipv6_ifa_notify(0, ifp);
3177 
3178 	addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3179 			      jiffies_to_clock_t(valid_lft * HZ), flags);
3180 	addrconf_verify(0);
3181 
3182 	return 0;
3183 }
3184 
3185 static int
3186 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3187 {
3188 	struct net *net = sock_net(skb->sk);
3189 	struct ifaddrmsg *ifm;
3190 	struct nlattr *tb[IFA_MAX+1];
3191 	struct in6_addr *pfx;
3192 	struct inet6_ifaddr *ifa;
3193 	struct net_device *dev;
3194 	u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3195 	u8 ifa_flags;
3196 	int err;
3197 
3198 	err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3199 	if (err < 0)
3200 		return err;
3201 
3202 	ifm = nlmsg_data(nlh);
3203 	pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3204 	if (pfx == NULL)
3205 		return -EINVAL;
3206 
3207 	if (tb[IFA_CACHEINFO]) {
3208 		struct ifa_cacheinfo *ci;
3209 
3210 		ci = nla_data(tb[IFA_CACHEINFO]);
3211 		valid_lft = ci->ifa_valid;
3212 		preferred_lft = ci->ifa_prefered;
3213 	} else {
3214 		preferred_lft = INFINITY_LIFE_TIME;
3215 		valid_lft = INFINITY_LIFE_TIME;
3216 	}
3217 
3218 	dev =  __dev_get_by_index(net, ifm->ifa_index);
3219 	if (dev == NULL)
3220 		return -ENODEV;
3221 
3222 	/* We ignore other flags so far. */
3223 	ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3224 
3225 	ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3226 	if (ifa == NULL) {
3227 		/*
3228 		 * It would be best to check for !NLM_F_CREATE here but
3229 		 * userspace alreay relies on not having to provide this.
3230 		 */
3231 		return inet6_addr_add(net, ifm->ifa_index, pfx,
3232 				      ifm->ifa_prefixlen, ifa_flags,
3233 				      preferred_lft, valid_lft);
3234 	}
3235 
3236 	if (nlh->nlmsg_flags & NLM_F_EXCL ||
3237 	    !(nlh->nlmsg_flags & NLM_F_REPLACE))
3238 		err = -EEXIST;
3239 	else
3240 		err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3241 
3242 	in6_ifa_put(ifa);
3243 
3244 	return err;
3245 }
3246 
3247 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3248 			  u8 scope, int ifindex)
3249 {
3250 	struct ifaddrmsg *ifm;
3251 
3252 	ifm = nlmsg_data(nlh);
3253 	ifm->ifa_family = AF_INET6;
3254 	ifm->ifa_prefixlen = prefixlen;
3255 	ifm->ifa_flags = flags;
3256 	ifm->ifa_scope = scope;
3257 	ifm->ifa_index = ifindex;
3258 }
3259 
3260 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3261 			 unsigned long tstamp, u32 preferred, u32 valid)
3262 {
3263 	struct ifa_cacheinfo ci;
3264 
3265 	ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3266 			+ TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3267 	ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3268 			+ TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3269 	ci.ifa_prefered = preferred;
3270 	ci.ifa_valid = valid;
3271 
3272 	return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3273 }
3274 
3275 static inline int rt_scope(int ifa_scope)
3276 {
3277 	if (ifa_scope & IFA_HOST)
3278 		return RT_SCOPE_HOST;
3279 	else if (ifa_scope & IFA_LINK)
3280 		return RT_SCOPE_LINK;
3281 	else if (ifa_scope & IFA_SITE)
3282 		return RT_SCOPE_SITE;
3283 	else
3284 		return RT_SCOPE_UNIVERSE;
3285 }
3286 
3287 static inline int inet6_ifaddr_msgsize(void)
3288 {
3289 	return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3290 	       + nla_total_size(16) /* IFA_ADDRESS */
3291 	       + nla_total_size(sizeof(struct ifa_cacheinfo));
3292 }
3293 
3294 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3295 			     u32 pid, u32 seq, int event, unsigned int flags)
3296 {
3297 	struct nlmsghdr  *nlh;
3298 	u32 preferred, valid;
3299 
3300 	nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3301 	if (nlh == NULL)
3302 		return -EMSGSIZE;
3303 
3304 	put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3305 		      ifa->idev->dev->ifindex);
3306 
3307 	if (!(ifa->flags&IFA_F_PERMANENT)) {
3308 		preferred = ifa->prefered_lft;
3309 		valid = ifa->valid_lft;
3310 		if (preferred != INFINITY_LIFE_TIME) {
3311 			long tval = (jiffies - ifa->tstamp)/HZ;
3312 			preferred -= tval;
3313 			if (valid != INFINITY_LIFE_TIME)
3314 				valid -= tval;
3315 		}
3316 	} else {
3317 		preferred = INFINITY_LIFE_TIME;
3318 		valid = INFINITY_LIFE_TIME;
3319 	}
3320 
3321 	if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3322 	    put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3323 		nlmsg_cancel(skb, nlh);
3324 		return -EMSGSIZE;
3325 	}
3326 
3327 	return nlmsg_end(skb, nlh);
3328 }
3329 
3330 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3331 				u32 pid, u32 seq, int event, u16 flags)
3332 {
3333 	struct nlmsghdr  *nlh;
3334 	u8 scope = RT_SCOPE_UNIVERSE;
3335 	int ifindex = ifmca->idev->dev->ifindex;
3336 
3337 	if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3338 		scope = RT_SCOPE_SITE;
3339 
3340 	nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3341 	if (nlh == NULL)
3342 		return -EMSGSIZE;
3343 
3344 	put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3345 	if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3346 	    put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3347 			  INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3348 		nlmsg_cancel(skb, nlh);
3349 		return -EMSGSIZE;
3350 	}
3351 
3352 	return nlmsg_end(skb, nlh);
3353 }
3354 
3355 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3356 				u32 pid, u32 seq, int event, unsigned int flags)
3357 {
3358 	struct nlmsghdr  *nlh;
3359 	u8 scope = RT_SCOPE_UNIVERSE;
3360 	int ifindex = ifaca->aca_idev->dev->ifindex;
3361 
3362 	if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3363 		scope = RT_SCOPE_SITE;
3364 
3365 	nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3366 	if (nlh == NULL)
3367 		return -EMSGSIZE;
3368 
3369 	put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3370 	if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3371 	    put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3372 			  INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3373 		nlmsg_cancel(skb, nlh);
3374 		return -EMSGSIZE;
3375 	}
3376 
3377 	return nlmsg_end(skb, nlh);
3378 }
3379 
3380 enum addr_type_t
3381 {
3382 	UNICAST_ADDR,
3383 	MULTICAST_ADDR,
3384 	ANYCAST_ADDR,
3385 };
3386 
3387 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3388 			   enum addr_type_t type)
3389 {
3390 	int idx, ip_idx;
3391 	int s_idx, s_ip_idx;
3392 	int err = 1;
3393 	struct net_device *dev;
3394 	struct inet6_dev *idev = NULL;
3395 	struct inet6_ifaddr *ifa;
3396 	struct ifmcaddr6 *ifmca;
3397 	struct ifacaddr6 *ifaca;
3398 	struct net *net = sock_net(skb->sk);
3399 
3400 	s_idx = cb->args[0];
3401 	s_ip_idx = ip_idx = cb->args[1];
3402 
3403 	idx = 0;
3404 	for_each_netdev(net, dev) {
3405 		if (idx < s_idx)
3406 			goto cont;
3407 		if (idx > s_idx)
3408 			s_ip_idx = 0;
3409 		ip_idx = 0;
3410 		if ((idev = in6_dev_get(dev)) == NULL)
3411 			goto cont;
3412 		read_lock_bh(&idev->lock);
3413 		switch (type) {
3414 		case UNICAST_ADDR:
3415 			/* unicast address incl. temp addr */
3416 			for (ifa = idev->addr_list; ifa;
3417 			     ifa = ifa->if_next, ip_idx++) {
3418 				if (ip_idx < s_ip_idx)
3419 					continue;
3420 				err = inet6_fill_ifaddr(skb, ifa,
3421 							NETLINK_CB(cb->skb).pid,
3422 							cb->nlh->nlmsg_seq,
3423 							RTM_NEWADDR,
3424 							NLM_F_MULTI);
3425 			}
3426 			break;
3427 		case MULTICAST_ADDR:
3428 			/* multicast address */
3429 			for (ifmca = idev->mc_list; ifmca;
3430 			     ifmca = ifmca->next, ip_idx++) {
3431 				if (ip_idx < s_ip_idx)
3432 					continue;
3433 				err = inet6_fill_ifmcaddr(skb, ifmca,
3434 							  NETLINK_CB(cb->skb).pid,
3435 							  cb->nlh->nlmsg_seq,
3436 							  RTM_GETMULTICAST,
3437 							  NLM_F_MULTI);
3438 			}
3439 			break;
3440 		case ANYCAST_ADDR:
3441 			/* anycast address */
3442 			for (ifaca = idev->ac_list; ifaca;
3443 			     ifaca = ifaca->aca_next, ip_idx++) {
3444 				if (ip_idx < s_ip_idx)
3445 					continue;
3446 				err = inet6_fill_ifacaddr(skb, ifaca,
3447 							  NETLINK_CB(cb->skb).pid,
3448 							  cb->nlh->nlmsg_seq,
3449 							  RTM_GETANYCAST,
3450 							  NLM_F_MULTI);
3451 			}
3452 			break;
3453 		default:
3454 			break;
3455 		}
3456 		read_unlock_bh(&idev->lock);
3457 		in6_dev_put(idev);
3458 
3459 		if (err <= 0)
3460 			break;
3461 cont:
3462 		idx++;
3463 	}
3464 	cb->args[0] = idx;
3465 	cb->args[1] = ip_idx;
3466 	return skb->len;
3467 }
3468 
3469 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3470 {
3471 	enum addr_type_t type = UNICAST_ADDR;
3472 
3473 	return inet6_dump_addr(skb, cb, type);
3474 }
3475 
3476 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3477 {
3478 	enum addr_type_t type = MULTICAST_ADDR;
3479 
3480 	return inet6_dump_addr(skb, cb, type);
3481 }
3482 
3483 
3484 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3485 {
3486 	enum addr_type_t type = ANYCAST_ADDR;
3487 
3488 	return inet6_dump_addr(skb, cb, type);
3489 }
3490 
3491 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3492 			     void *arg)
3493 {
3494 	struct net *net = sock_net(in_skb->sk);
3495 	struct ifaddrmsg *ifm;
3496 	struct nlattr *tb[IFA_MAX+1];
3497 	struct in6_addr *addr = NULL;
3498 	struct net_device *dev = NULL;
3499 	struct inet6_ifaddr *ifa;
3500 	struct sk_buff *skb;
3501 	int err;
3502 
3503 	err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3504 	if (err < 0)
3505 		goto errout;
3506 
3507 	addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3508 	if (addr == NULL) {
3509 		err = -EINVAL;
3510 		goto errout;
3511 	}
3512 
3513 	ifm = nlmsg_data(nlh);
3514 	if (ifm->ifa_index)
3515 		dev = __dev_get_by_index(net, ifm->ifa_index);
3516 
3517 	if ((ifa = ipv6_get_ifaddr(net, addr, dev, 1)) == NULL) {
3518 		err = -EADDRNOTAVAIL;
3519 		goto errout;
3520 	}
3521 
3522 	if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) {
3523 		err = -ENOBUFS;
3524 		goto errout_ifa;
3525 	}
3526 
3527 	err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3528 				nlh->nlmsg_seq, RTM_NEWADDR, 0);
3529 	if (err < 0) {
3530 		/* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3531 		WARN_ON(err == -EMSGSIZE);
3532 		kfree_skb(skb);
3533 		goto errout_ifa;
3534 	}
3535 	err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
3536 errout_ifa:
3537 	in6_ifa_put(ifa);
3538 errout:
3539 	return err;
3540 }
3541 
3542 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3543 {
3544 	struct sk_buff *skb;
3545 	struct net *net = dev_net(ifa->idev->dev);
3546 	int err = -ENOBUFS;
3547 
3548 	skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3549 	if (skb == NULL)
3550 		goto errout;
3551 
3552 	err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3553 	if (err < 0) {
3554 		/* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3555 		WARN_ON(err == -EMSGSIZE);
3556 		kfree_skb(skb);
3557 		goto errout;
3558 	}
3559 	err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3560 errout:
3561 	if (err < 0)
3562 		rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3563 }
3564 
3565 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3566 				__s32 *array, int bytes)
3567 {
3568 	BUG_ON(bytes < (DEVCONF_MAX * 4));
3569 
3570 	memset(array, 0, bytes);
3571 	array[DEVCONF_FORWARDING] = cnf->forwarding;
3572 	array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3573 	array[DEVCONF_MTU6] = cnf->mtu6;
3574 	array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3575 	array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3576 	array[DEVCONF_AUTOCONF] = cnf->autoconf;
3577 	array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3578 	array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3579 	array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3580 	array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3581 	array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3582 #ifdef CONFIG_IPV6_PRIVACY
3583 	array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3584 	array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3585 	array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3586 	array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3587 	array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3588 #endif
3589 	array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3590 	array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3591 	array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3592 #ifdef CONFIG_IPV6_ROUTER_PREF
3593 	array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3594 	array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
3595 #ifdef CONFIG_IPV6_ROUTE_INFO
3596 	array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3597 #endif
3598 #endif
3599 	array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3600 	array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3601 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3602 	array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3603 #endif
3604 #ifdef CONFIG_IPV6_MROUTE
3605 	array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
3606 #endif
3607 }
3608 
3609 static inline size_t inet6_if_nlmsg_size(void)
3610 {
3611 	return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3612 	       + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3613 	       + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3614 	       + nla_total_size(4) /* IFLA_MTU */
3615 	       + nla_total_size(4) /* IFLA_LINK */
3616 	       + nla_total_size( /* IFLA_PROTINFO */
3617 			nla_total_size(4) /* IFLA_INET6_FLAGS */
3618 			+ nla_total_size(sizeof(struct ifla_cacheinfo))
3619 			+ nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3620 			+ nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3621 			+ nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
3622 		 );
3623 }
3624 
3625 static inline void __snmp6_fill_stats(u64 *stats, void **mib, int items,
3626 				      int bytes)
3627 {
3628 	int i;
3629 	int pad = bytes - sizeof(u64) * items;
3630 	BUG_ON(pad < 0);
3631 
3632 	/* Use put_unaligned() because stats may not be aligned for u64. */
3633 	put_unaligned(items, &stats[0]);
3634 	for (i = 1; i < items; i++)
3635 		put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3636 
3637 	memset(&stats[items], 0, pad);
3638 }
3639 
3640 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3641 			     int bytes)
3642 {
3643 	switch(attrtype) {
3644 	case IFLA_INET6_STATS:
3645 		__snmp6_fill_stats(stats, (void **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes);
3646 		break;
3647 	case IFLA_INET6_ICMP6STATS:
3648 		__snmp6_fill_stats(stats, (void **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
3649 		break;
3650 	}
3651 }
3652 
3653 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3654 			     u32 pid, u32 seq, int event, unsigned int flags)
3655 {
3656 	struct net_device *dev = idev->dev;
3657 	struct nlattr *nla;
3658 	struct ifinfomsg *hdr;
3659 	struct nlmsghdr *nlh;
3660 	void *protoinfo;
3661 	struct ifla_cacheinfo ci;
3662 
3663 	nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3664 	if (nlh == NULL)
3665 		return -EMSGSIZE;
3666 
3667 	hdr = nlmsg_data(nlh);
3668 	hdr->ifi_family = AF_INET6;
3669 	hdr->__ifi_pad = 0;
3670 	hdr->ifi_type = dev->type;
3671 	hdr->ifi_index = dev->ifindex;
3672 	hdr->ifi_flags = dev_get_flags(dev);
3673 	hdr->ifi_change = 0;
3674 
3675 	NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
3676 
3677 	if (dev->addr_len)
3678 		NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3679 
3680 	NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
3681 	if (dev->ifindex != dev->iflink)
3682 		NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
3683 
3684 	protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3685 	if (protoinfo == NULL)
3686 		goto nla_put_failure;
3687 
3688 	NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
3689 
3690 	ci.max_reasm_len = IPV6_MAXPLEN;
3691 	ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3692 		    + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3693 	ci.reachable_time = idev->nd_parms->reachable_time;
3694 	ci.retrans_time = idev->nd_parms->retrans_time;
3695 	NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3696 
3697 	nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3698 	if (nla == NULL)
3699 		goto nla_put_failure;
3700 	ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
3701 
3702 	/* XXX - MC not implemented */
3703 
3704 	nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3705 	if (nla == NULL)
3706 		goto nla_put_failure;
3707 	snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3708 
3709 	nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3710 	if (nla == NULL)
3711 		goto nla_put_failure;
3712 	snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
3713 
3714 	nla_nest_end(skb, protoinfo);
3715 	return nlmsg_end(skb, nlh);
3716 
3717 nla_put_failure:
3718 	nlmsg_cancel(skb, nlh);
3719 	return -EMSGSIZE;
3720 }
3721 
3722 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3723 {
3724 	struct net *net = sock_net(skb->sk);
3725 	int idx, err;
3726 	int s_idx = cb->args[0];
3727 	struct net_device *dev;
3728 	struct inet6_dev *idev;
3729 
3730 	read_lock(&dev_base_lock);
3731 	idx = 0;
3732 	for_each_netdev(net, dev) {
3733 		if (idx < s_idx)
3734 			goto cont;
3735 		if ((idev = in6_dev_get(dev)) == NULL)
3736 			goto cont;
3737 		err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
3738 				cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
3739 		in6_dev_put(idev);
3740 		if (err <= 0)
3741 			break;
3742 cont:
3743 		idx++;
3744 	}
3745 	read_unlock(&dev_base_lock);
3746 	cb->args[0] = idx;
3747 
3748 	return skb->len;
3749 }
3750 
3751 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3752 {
3753 	struct sk_buff *skb;
3754 	struct net *net = dev_net(idev->dev);
3755 	int err = -ENOBUFS;
3756 
3757 	skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
3758 	if (skb == NULL)
3759 		goto errout;
3760 
3761 	err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
3762 	if (err < 0) {
3763 		/* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3764 		WARN_ON(err == -EMSGSIZE);
3765 		kfree_skb(skb);
3766 		goto errout;
3767 	}
3768 	err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3769 errout:
3770 	if (err < 0)
3771 		rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3772 }
3773 
3774 static inline size_t inet6_prefix_nlmsg_size(void)
3775 {
3776 	return NLMSG_ALIGN(sizeof(struct prefixmsg))
3777 	       + nla_total_size(sizeof(struct in6_addr))
3778 	       + nla_total_size(sizeof(struct prefix_cacheinfo));
3779 }
3780 
3781 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
3782 			     struct prefix_info *pinfo, u32 pid, u32 seq,
3783 			     int event, unsigned int flags)
3784 {
3785 	struct prefixmsg *pmsg;
3786 	struct nlmsghdr *nlh;
3787 	struct prefix_cacheinfo	ci;
3788 
3789 	nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
3790 	if (nlh == NULL)
3791 		return -EMSGSIZE;
3792 
3793 	pmsg = nlmsg_data(nlh);
3794 	pmsg->prefix_family = AF_INET6;
3795 	pmsg->prefix_pad1 = 0;
3796 	pmsg->prefix_pad2 = 0;
3797 	pmsg->prefix_ifindex = idev->dev->ifindex;
3798 	pmsg->prefix_len = pinfo->prefix_len;
3799 	pmsg->prefix_type = pinfo->type;
3800 	pmsg->prefix_pad3 = 0;
3801 	pmsg->prefix_flags = 0;
3802 	if (pinfo->onlink)
3803 		pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3804 	if (pinfo->autoconf)
3805 		pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3806 
3807 	NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
3808 
3809 	ci.preferred_time = ntohl(pinfo->prefered);
3810 	ci.valid_time = ntohl(pinfo->valid);
3811 	NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
3812 
3813 	return nlmsg_end(skb, nlh);
3814 
3815 nla_put_failure:
3816 	nlmsg_cancel(skb, nlh);
3817 	return -EMSGSIZE;
3818 }
3819 
3820 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
3821 			 struct prefix_info *pinfo)
3822 {
3823 	struct sk_buff *skb;
3824 	struct net *net = dev_net(idev->dev);
3825 	int err = -ENOBUFS;
3826 
3827 	skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
3828 	if (skb == NULL)
3829 		goto errout;
3830 
3831 	err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
3832 	if (err < 0) {
3833 		/* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
3834 		WARN_ON(err == -EMSGSIZE);
3835 		kfree_skb(skb);
3836 		goto errout;
3837 	}
3838 	err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
3839 errout:
3840 	if (err < 0)
3841 		rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
3842 }
3843 
3844 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3845 {
3846 	inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3847 
3848 	switch (event) {
3849 	case RTM_NEWADDR:
3850 		/*
3851 		 * If the address was optimistic
3852 		 * we inserted the route at the start of
3853 		 * our DAD process, so we don't need
3854 		 * to do it again
3855 		 */
3856 		if (!(ifp->rt->rt6i_node))
3857 			ip6_ins_rt(ifp->rt);
3858 		if (ifp->idev->cnf.forwarding)
3859 			addrconf_join_anycast(ifp);
3860 		break;
3861 	case RTM_DELADDR:
3862 		if (ifp->idev->cnf.forwarding)
3863 			addrconf_leave_anycast(ifp);
3864 		addrconf_leave_solict(ifp->idev, &ifp->addr);
3865 		dst_hold(&ifp->rt->u.dst);
3866 		if (ip6_del_rt(ifp->rt))
3867 			dst_free(&ifp->rt->u.dst);
3868 		break;
3869 	}
3870 }
3871 
3872 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3873 {
3874 	rcu_read_lock_bh();
3875 	if (likely(ifp->idev->dead == 0))
3876 		__ipv6_ifa_notify(event, ifp);
3877 	rcu_read_unlock_bh();
3878 }
3879 
3880 #ifdef CONFIG_SYSCTL
3881 
3882 static
3883 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3884 			   void __user *buffer, size_t *lenp, loff_t *ppos)
3885 {
3886 	int *valp = ctl->data;
3887 	int val = *valp;
3888 	int ret;
3889 
3890 	ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3891 
3892 	if (write)
3893 		addrconf_fixup_forwarding(ctl, valp, val);
3894 	return ret;
3895 }
3896 
3897 static int addrconf_sysctl_forward_strategy(ctl_table *table,
3898 					    int __user *name, int nlen,
3899 					    void __user *oldval,
3900 					    size_t __user *oldlenp,
3901 					    void __user *newval, size_t newlen)
3902 {
3903 	int *valp = table->data;
3904 	int val = *valp;
3905 	int new;
3906 
3907 	if (!newval || !newlen)
3908 		return 0;
3909 	if (newlen != sizeof(int))
3910 		return -EINVAL;
3911 	if (get_user(new, (int __user *)newval))
3912 		return -EFAULT;
3913 	if (new == *valp)
3914 		return 0;
3915 	if (oldval && oldlenp) {
3916 		size_t len;
3917 		if (get_user(len, oldlenp))
3918 			return -EFAULT;
3919 		if (len) {
3920 			if (len > table->maxlen)
3921 				len = table->maxlen;
3922 			if (copy_to_user(oldval, valp, len))
3923 				return -EFAULT;
3924 			if (put_user(len, oldlenp))
3925 				return -EFAULT;
3926 		}
3927 	}
3928 
3929 	*valp = new;
3930 	addrconf_fixup_forwarding(table, valp, val);
3931 	return 1;
3932 }
3933 
3934 static struct addrconf_sysctl_table
3935 {
3936 	struct ctl_table_header *sysctl_header;
3937 	ctl_table addrconf_vars[DEVCONF_MAX+1];
3938 	char *dev_name;
3939 } addrconf_sysctl __read_mostly = {
3940 	.sysctl_header = NULL,
3941 	.addrconf_vars = {
3942 		{
3943 			.ctl_name	=	NET_IPV6_FORWARDING,
3944 			.procname	=	"forwarding",
3945 			.data		=	&ipv6_devconf.forwarding,
3946 			.maxlen		=	sizeof(int),
3947 			.mode		=	0644,
3948 			.proc_handler	=	&addrconf_sysctl_forward,
3949 			.strategy	=	&addrconf_sysctl_forward_strategy,
3950 		},
3951 		{
3952 			.ctl_name	=	NET_IPV6_HOP_LIMIT,
3953 			.procname	=	"hop_limit",
3954 			.data		=	&ipv6_devconf.hop_limit,
3955 			.maxlen		=	sizeof(int),
3956 			.mode		=	0644,
3957 			.proc_handler	=	proc_dointvec,
3958 		},
3959 		{
3960 			.ctl_name	=	NET_IPV6_MTU,
3961 			.procname	=	"mtu",
3962 			.data		=	&ipv6_devconf.mtu6,
3963 			.maxlen		=	sizeof(int),
3964 			.mode		=	0644,
3965 			.proc_handler	=	&proc_dointvec,
3966 		},
3967 		{
3968 			.ctl_name	=	NET_IPV6_ACCEPT_RA,
3969 			.procname	=	"accept_ra",
3970 			.data		=	&ipv6_devconf.accept_ra,
3971 			.maxlen		=	sizeof(int),
3972 			.mode		=	0644,
3973 			.proc_handler	=	&proc_dointvec,
3974 		},
3975 		{
3976 			.ctl_name	=	NET_IPV6_ACCEPT_REDIRECTS,
3977 			.procname	=	"accept_redirects",
3978 			.data		=	&ipv6_devconf.accept_redirects,
3979 			.maxlen		=	sizeof(int),
3980 			.mode		=	0644,
3981 			.proc_handler	=	&proc_dointvec,
3982 		},
3983 		{
3984 			.ctl_name	=	NET_IPV6_AUTOCONF,
3985 			.procname	=	"autoconf",
3986 			.data		=	&ipv6_devconf.autoconf,
3987 			.maxlen		=	sizeof(int),
3988 			.mode		=	0644,
3989 			.proc_handler	=	&proc_dointvec,
3990 		},
3991 		{
3992 			.ctl_name	=	NET_IPV6_DAD_TRANSMITS,
3993 			.procname	=	"dad_transmits",
3994 			.data		=	&ipv6_devconf.dad_transmits,
3995 			.maxlen		=	sizeof(int),
3996 			.mode		=	0644,
3997 			.proc_handler	=	&proc_dointvec,
3998 		},
3999 		{
4000 			.ctl_name	=	NET_IPV6_RTR_SOLICITS,
4001 			.procname	=	"router_solicitations",
4002 			.data		=	&ipv6_devconf.rtr_solicits,
4003 			.maxlen		=	sizeof(int),
4004 			.mode		=	0644,
4005 			.proc_handler	=	&proc_dointvec,
4006 		},
4007 		{
4008 			.ctl_name	=	NET_IPV6_RTR_SOLICIT_INTERVAL,
4009 			.procname	=	"router_solicitation_interval",
4010 			.data		=	&ipv6_devconf.rtr_solicit_interval,
4011 			.maxlen		=	sizeof(int),
4012 			.mode		=	0644,
4013 			.proc_handler	=	&proc_dointvec_jiffies,
4014 			.strategy	=	&sysctl_jiffies,
4015 		},
4016 		{
4017 			.ctl_name	=	NET_IPV6_RTR_SOLICIT_DELAY,
4018 			.procname	=	"router_solicitation_delay",
4019 			.data		=	&ipv6_devconf.rtr_solicit_delay,
4020 			.maxlen		=	sizeof(int),
4021 			.mode		=	0644,
4022 			.proc_handler	=	&proc_dointvec_jiffies,
4023 			.strategy	=	&sysctl_jiffies,
4024 		},
4025 		{
4026 			.ctl_name	=	NET_IPV6_FORCE_MLD_VERSION,
4027 			.procname	=	"force_mld_version",
4028 			.data		=	&ipv6_devconf.force_mld_version,
4029 			.maxlen		=	sizeof(int),
4030 			.mode		=	0644,
4031 			.proc_handler	=	&proc_dointvec,
4032 		},
4033 #ifdef CONFIG_IPV6_PRIVACY
4034 		{
4035 			.ctl_name	=	NET_IPV6_USE_TEMPADDR,
4036 			.procname	=	"use_tempaddr",
4037 			.data		=	&ipv6_devconf.use_tempaddr,
4038 			.maxlen		=	sizeof(int),
4039 			.mode		=	0644,
4040 			.proc_handler	=	&proc_dointvec,
4041 		},
4042 		{
4043 			.ctl_name	=	NET_IPV6_TEMP_VALID_LFT,
4044 			.procname	=	"temp_valid_lft",
4045 			.data		=	&ipv6_devconf.temp_valid_lft,
4046 			.maxlen		=	sizeof(int),
4047 			.mode		=	0644,
4048 			.proc_handler	=	&proc_dointvec,
4049 		},
4050 		{
4051 			.ctl_name	=	NET_IPV6_TEMP_PREFERED_LFT,
4052 			.procname	=	"temp_prefered_lft",
4053 			.data		=	&ipv6_devconf.temp_prefered_lft,
4054 			.maxlen		=	sizeof(int),
4055 			.mode		=	0644,
4056 			.proc_handler	=	&proc_dointvec,
4057 		},
4058 		{
4059 			.ctl_name	=	NET_IPV6_REGEN_MAX_RETRY,
4060 			.procname	=	"regen_max_retry",
4061 			.data		=	&ipv6_devconf.regen_max_retry,
4062 			.maxlen		=	sizeof(int),
4063 			.mode		=	0644,
4064 			.proc_handler	=	&proc_dointvec,
4065 		},
4066 		{
4067 			.ctl_name	=	NET_IPV6_MAX_DESYNC_FACTOR,
4068 			.procname	=	"max_desync_factor",
4069 			.data		=	&ipv6_devconf.max_desync_factor,
4070 			.maxlen		=	sizeof(int),
4071 			.mode		=	0644,
4072 			.proc_handler	=	&proc_dointvec,
4073 		},
4074 #endif
4075 		{
4076 			.ctl_name	=	NET_IPV6_MAX_ADDRESSES,
4077 			.procname	=	"max_addresses",
4078 			.data		=	&ipv6_devconf.max_addresses,
4079 			.maxlen		=	sizeof(int),
4080 			.mode		=	0644,
4081 			.proc_handler	=	&proc_dointvec,
4082 		},
4083 		{
4084 			.ctl_name	=	NET_IPV6_ACCEPT_RA_DEFRTR,
4085 			.procname	=	"accept_ra_defrtr",
4086 			.data		=	&ipv6_devconf.accept_ra_defrtr,
4087 			.maxlen		=	sizeof(int),
4088 			.mode		=	0644,
4089 			.proc_handler	=	&proc_dointvec,
4090 		},
4091 		{
4092 			.ctl_name	=	NET_IPV6_ACCEPT_RA_PINFO,
4093 			.procname	=	"accept_ra_pinfo",
4094 			.data		=	&ipv6_devconf.accept_ra_pinfo,
4095 			.maxlen		=	sizeof(int),
4096 			.mode		=	0644,
4097 			.proc_handler	=	&proc_dointvec,
4098 		},
4099 #ifdef CONFIG_IPV6_ROUTER_PREF
4100 		{
4101 			.ctl_name	=	NET_IPV6_ACCEPT_RA_RTR_PREF,
4102 			.procname	=	"accept_ra_rtr_pref",
4103 			.data		=	&ipv6_devconf.accept_ra_rtr_pref,
4104 			.maxlen		=	sizeof(int),
4105 			.mode		=	0644,
4106 			.proc_handler	=	&proc_dointvec,
4107 		},
4108 		{
4109 			.ctl_name	=	NET_IPV6_RTR_PROBE_INTERVAL,
4110 			.procname	=	"router_probe_interval",
4111 			.data		=	&ipv6_devconf.rtr_probe_interval,
4112 			.maxlen		=	sizeof(int),
4113 			.mode		=	0644,
4114 			.proc_handler	=	&proc_dointvec_jiffies,
4115 			.strategy	=	&sysctl_jiffies,
4116 		},
4117 #ifdef CONFIG_IPV6_ROUTE_INFO
4118 		{
4119 			.ctl_name	=	NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN,
4120 			.procname	=	"accept_ra_rt_info_max_plen",
4121 			.data		=	&ipv6_devconf.accept_ra_rt_info_max_plen,
4122 			.maxlen		=	sizeof(int),
4123 			.mode		=	0644,
4124 			.proc_handler	=	&proc_dointvec,
4125 		},
4126 #endif
4127 #endif
4128 		{
4129 			.ctl_name	=	NET_IPV6_PROXY_NDP,
4130 			.procname	=	"proxy_ndp",
4131 			.data		=	&ipv6_devconf.proxy_ndp,
4132 			.maxlen		=	sizeof(int),
4133 			.mode		=	0644,
4134 			.proc_handler	=	&proc_dointvec,
4135 		},
4136 		{
4137 			.ctl_name	=	NET_IPV6_ACCEPT_SOURCE_ROUTE,
4138 			.procname	=	"accept_source_route",
4139 			.data		=	&ipv6_devconf.accept_source_route,
4140 			.maxlen		=	sizeof(int),
4141 			.mode		=	0644,
4142 			.proc_handler	=	&proc_dointvec,
4143 		},
4144 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4145 		{
4146 			.ctl_name	=	CTL_UNNUMBERED,
4147 			.procname       =       "optimistic_dad",
4148 			.data           =       &ipv6_devconf.optimistic_dad,
4149 			.maxlen         =       sizeof(int),
4150 			.mode           =       0644,
4151 			.proc_handler   =       &proc_dointvec,
4152 
4153 		},
4154 #endif
4155 #ifdef CONFIG_IPV6_MROUTE
4156 		{
4157 			.ctl_name	=	CTL_UNNUMBERED,
4158 			.procname	=	"mc_forwarding",
4159 			.data		=	&ipv6_devconf.mc_forwarding,
4160 			.maxlen		=	sizeof(int),
4161 			.mode		=	0644,
4162 			.proc_handler	=	&proc_dointvec,
4163 		},
4164 #endif
4165 		{
4166 			.ctl_name	=	0,	/* sentinel */
4167 		}
4168 	},
4169 };
4170 
4171 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4172 		int ctl_name, struct inet6_dev *idev, struct ipv6_devconf *p)
4173 {
4174 	int i;
4175 	struct addrconf_sysctl_table *t;
4176 
4177 #define ADDRCONF_CTL_PATH_DEV	3
4178 
4179 	struct ctl_path addrconf_ctl_path[] = {
4180 		{ .procname = "net", .ctl_name = CTL_NET, },
4181 		{ .procname = "ipv6", .ctl_name = NET_IPV6, },
4182 		{ .procname = "conf", .ctl_name = NET_IPV6_CONF, },
4183 		{ /* to be set */ },
4184 		{ },
4185 	};
4186 
4187 
4188 	t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4189 	if (t == NULL)
4190 		goto out;
4191 
4192 	for (i=0; t->addrconf_vars[i].data; i++) {
4193 		t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
4194 		t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4195 		t->addrconf_vars[i].extra2 = net;
4196 	}
4197 
4198 	/*
4199 	 * Make a copy of dev_name, because '.procname' is regarded as const
4200 	 * by sysctl and we wouldn't want anyone to change it under our feet
4201 	 * (see SIOCSIFNAME).
4202 	 */
4203 	t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4204 	if (!t->dev_name)
4205 		goto free;
4206 
4207 	addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
4208 	addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].ctl_name = ctl_name;
4209 
4210 	t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
4211 			t->addrconf_vars);
4212 	if (t->sysctl_header == NULL)
4213 		goto free_procname;
4214 
4215 	p->sysctl = t;
4216 	return 0;
4217 
4218 free_procname:
4219 	kfree(t->dev_name);
4220 free:
4221 	kfree(t);
4222 out:
4223 	return -ENOBUFS;
4224 }
4225 
4226 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4227 {
4228 	struct addrconf_sysctl_table *t;
4229 
4230 	if (p->sysctl == NULL)
4231 		return;
4232 
4233 	t = p->sysctl;
4234 	p->sysctl = NULL;
4235 	unregister_sysctl_table(t->sysctl_header);
4236 	kfree(t->dev_name);
4237 	kfree(t);
4238 }
4239 
4240 static void addrconf_sysctl_register(struct inet6_dev *idev)
4241 {
4242 	neigh_sysctl_register(idev->dev, idev->nd_parms, NET_IPV6,
4243 			      NET_IPV6_NEIGH, "ipv6",
4244 			      &ndisc_ifinfo_sysctl_change,
4245 			      NULL);
4246 	__addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
4247 			idev->dev->ifindex, idev, &idev->cnf);
4248 }
4249 
4250 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
4251 {
4252 	__addrconf_sysctl_unregister(&idev->cnf);
4253 	neigh_sysctl_unregister(idev->nd_parms);
4254 }
4255 
4256 
4257 #endif
4258 
4259 static int addrconf_init_net(struct net *net)
4260 {
4261 	int err;
4262 	struct ipv6_devconf *all, *dflt;
4263 
4264 	err = -ENOMEM;
4265 	all = &ipv6_devconf;
4266 	dflt = &ipv6_devconf_dflt;
4267 
4268 	if (net != &init_net) {
4269 		all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4270 		if (all == NULL)
4271 			goto err_alloc_all;
4272 
4273 		dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4274 		if (dflt == NULL)
4275 			goto err_alloc_dflt;
4276 	}
4277 
4278 	net->ipv6.devconf_all = all;
4279 	net->ipv6.devconf_dflt = dflt;
4280 
4281 #ifdef CONFIG_SYSCTL
4282 	err = __addrconf_sysctl_register(net, "all", NET_PROTO_CONF_ALL,
4283 			NULL, all);
4284 	if (err < 0)
4285 		goto err_reg_all;
4286 
4287 	err = __addrconf_sysctl_register(net, "default", NET_PROTO_CONF_DEFAULT,
4288 			NULL, dflt);
4289 	if (err < 0)
4290 		goto err_reg_dflt;
4291 #endif
4292 	return 0;
4293 
4294 #ifdef CONFIG_SYSCTL
4295 err_reg_dflt:
4296 	__addrconf_sysctl_unregister(all);
4297 err_reg_all:
4298 	kfree(dflt);
4299 #endif
4300 err_alloc_dflt:
4301 	kfree(all);
4302 err_alloc_all:
4303 	return err;
4304 }
4305 
4306 static void addrconf_exit_net(struct net *net)
4307 {
4308 #ifdef CONFIG_SYSCTL
4309 	__addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4310 	__addrconf_sysctl_unregister(net->ipv6.devconf_all);
4311 #endif
4312 	if (net != &init_net) {
4313 		kfree(net->ipv6.devconf_dflt);
4314 		kfree(net->ipv6.devconf_all);
4315 	}
4316 }
4317 
4318 static struct pernet_operations addrconf_ops = {
4319 	.init = addrconf_init_net,
4320 	.exit = addrconf_exit_net,
4321 };
4322 
4323 /*
4324  *      Device notifier
4325  */
4326 
4327 int register_inet6addr_notifier(struct notifier_block *nb)
4328 {
4329 	return atomic_notifier_chain_register(&inet6addr_chain, nb);
4330 }
4331 
4332 EXPORT_SYMBOL(register_inet6addr_notifier);
4333 
4334 int unregister_inet6addr_notifier(struct notifier_block *nb)
4335 {
4336 	return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
4337 }
4338 
4339 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4340 
4341 
4342 static int addrconf_net_init(struct net *net)
4343 {
4344 	return 0;
4345 }
4346 
4347 static void addrconf_net_exit(struct net *net)
4348 {
4349 	struct net_device *dev;
4350 
4351 	rtnl_lock();
4352 	/* clean dev list */
4353 	for_each_netdev(net, dev) {
4354 		if (__in6_dev_get(dev) == NULL)
4355 			continue;
4356 		addrconf_ifdown(dev, 1);
4357 	}
4358 	addrconf_ifdown(net->loopback_dev, 2);
4359 	rtnl_unlock();
4360 }
4361 
4362 static struct pernet_operations addrconf_net_ops = {
4363 	.init = addrconf_net_init,
4364 	.exit = addrconf_net_exit,
4365 };
4366 
4367 /*
4368  *	Init / cleanup code
4369  */
4370 
4371 int __init addrconf_init(void)
4372 {
4373 	int err;
4374 
4375 	if ((err = ipv6_addr_label_init()) < 0) {
4376 		printk(KERN_CRIT "IPv6 Addrconf: cannot initialize default policy table: %d.\n",
4377 			err);
4378 		return err;
4379 	}
4380 
4381 	register_pernet_subsys(&addrconf_ops);
4382 
4383 	/* The addrconf netdev notifier requires that loopback_dev
4384 	 * has it's ipv6 private information allocated and setup
4385 	 * before it can bring up and give link-local addresses
4386 	 * to other devices which are up.
4387 	 *
4388 	 * Unfortunately, loopback_dev is not necessarily the first
4389 	 * entry in the global dev_base list of net devices.  In fact,
4390 	 * it is likely to be the very last entry on that list.
4391 	 * So this causes the notifier registry below to try and
4392 	 * give link-local addresses to all devices besides loopback_dev
4393 	 * first, then loopback_dev, which cases all the non-loopback_dev
4394 	 * devices to fail to get a link-local address.
4395 	 *
4396 	 * So, as a temporary fix, allocate the ipv6 structure for
4397 	 * loopback_dev first by hand.
4398 	 * Longer term, all of the dependencies ipv6 has upon the loopback
4399 	 * device and it being up should be removed.
4400 	 */
4401 	rtnl_lock();
4402 	if (!ipv6_add_dev(init_net.loopback_dev))
4403 		err = -ENOMEM;
4404 	rtnl_unlock();
4405 	if (err)
4406 		goto errlo;
4407 
4408 	err = register_pernet_device(&addrconf_net_ops);
4409 	if (err)
4410 		return err;
4411 
4412 	register_netdevice_notifier(&ipv6_dev_notf);
4413 
4414 	addrconf_verify(0);
4415 
4416 	err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4417 	if (err < 0)
4418 		goto errout;
4419 
4420 	/* Only the first call to __rtnl_register can fail */
4421 	__rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4422 	__rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4423 	__rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4424 	__rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4425 	__rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4426 
4427 	ipv6_addr_label_rtnl_register();
4428 
4429 	return 0;
4430 errout:
4431 	unregister_netdevice_notifier(&ipv6_dev_notf);
4432 errlo:
4433 	unregister_pernet_subsys(&addrconf_ops);
4434 
4435 	return err;
4436 }
4437 
4438 void addrconf_cleanup(void)
4439 {
4440 	struct inet6_ifaddr *ifa;
4441 	int i;
4442 
4443 	unregister_netdevice_notifier(&ipv6_dev_notf);
4444 	unregister_pernet_device(&addrconf_net_ops);
4445 
4446 	unregister_pernet_subsys(&addrconf_ops);
4447 
4448 	rtnl_lock();
4449 
4450 	/*
4451 	 *	Check hash table.
4452 	 */
4453 	write_lock_bh(&addrconf_hash_lock);
4454 	for (i=0; i < IN6_ADDR_HSIZE; i++) {
4455 		for (ifa=inet6_addr_lst[i]; ifa; ) {
4456 			struct inet6_ifaddr *bifa;
4457 
4458 			bifa = ifa;
4459 			ifa = ifa->lst_next;
4460 			printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
4461 			/* Do not free it; something is wrong.
4462 			   Now we can investigate it with debugger.
4463 			 */
4464 		}
4465 	}
4466 	write_unlock_bh(&addrconf_hash_lock);
4467 
4468 	del_timer(&addr_chk_timer);
4469 	rtnl_unlock();
4470 
4471 	unregister_pernet_subsys(&addrconf_net_ops);
4472 }
4473