xref: /openbmc/linux/net/ipv6/addrconf.c (revision 5241c2d7c52757e6df79877ba282762df0caea9f)
1 /*
2  *	IPv6 Address [auto]configuration
3  *	Linux INET6 implementation
4  *
5  *	Authors:
6  *	Pedro Roque		<roque@di.fc.ul.pt>
7  *	Alexey Kuznetsov	<kuznet@ms2.inr.ac.ru>
8  *
9  *	This program is free software; you can redistribute it and/or
10  *      modify it under the terms of the GNU General Public License
11  *      as published by the Free Software Foundation; either version
12  *      2 of the License, or (at your option) any later version.
13  */
14 
15 /*
16  *	Changes:
17  *
18  *	Janos Farkas			:	delete timer on ifdown
19  *	<chexum@bankinf.banki.hu>
20  *	Andi Kleen			:	kill double kfree on module
21  *						unload.
22  *	Maciej W. Rozycki		:	FDDI support
23  *	sekiya@USAGI			:	Don't send too many RS
24  *						packets.
25  *	yoshfuji@USAGI			:       Fixed interval between DAD
26  *						packets.
27  *	YOSHIFUJI Hideaki @USAGI	:	improved accuracy of
28  *						address validation timer.
29  *	YOSHIFUJI Hideaki @USAGI	:	Privacy Extensions (RFC3041)
30  *						support.
31  *	Yuji SEKIYA @USAGI		:	Don't assign a same IPv6
32  *						address on a same interface.
33  *	YOSHIFUJI Hideaki @USAGI	:	ARCnet support
34  *	YOSHIFUJI Hideaki @USAGI	:	convert /proc/net/if_inet6 to
35  *						seq_file.
36  *	YOSHIFUJI Hideaki @USAGI	:	improved source address
37  *						selection; consider scope,
38  *						status etc.
39  */
40 
41 #define pr_fmt(fmt) "IPv6: " fmt
42 
43 #include <linux/errno.h>
44 #include <linux/types.h>
45 #include <linux/kernel.h>
46 #include <linux/socket.h>
47 #include <linux/sockios.h>
48 #include <linux/net.h>
49 #include <linux/inet.h>
50 #include <linux/in6.h>
51 #include <linux/netdevice.h>
52 #include <linux/if_addr.h>
53 #include <linux/if_arp.h>
54 #include <linux/if_arcnet.h>
55 #include <linux/if_infiniband.h>
56 #include <linux/route.h>
57 #include <linux/inetdevice.h>
58 #include <linux/init.h>
59 #include <linux/slab.h>
60 #ifdef CONFIG_SYSCTL
61 #include <linux/sysctl.h>
62 #endif
63 #include <linux/capability.h>
64 #include <linux/delay.h>
65 #include <linux/notifier.h>
66 #include <linux/string.h>
67 #include <linux/hash.h>
68 
69 #include <net/net_namespace.h>
70 #include <net/sock.h>
71 #include <net/snmp.h>
72 
73 #include <net/6lowpan.h>
74 #include <net/firewire.h>
75 #include <net/ipv6.h>
76 #include <net/protocol.h>
77 #include <net/ndisc.h>
78 #include <net/ip6_route.h>
79 #include <net/addrconf.h>
80 #include <net/tcp.h>
81 #include <net/ip.h>
82 #include <net/netlink.h>
83 #include <net/pkt_sched.h>
84 #include <net/l3mdev.h>
85 #include <linux/if_tunnel.h>
86 #include <linux/rtnetlink.h>
87 #include <linux/netconf.h>
88 #include <linux/random.h>
89 #include <linux/uaccess.h>
90 #include <asm/unaligned.h>
91 
92 #include <linux/proc_fs.h>
93 #include <linux/seq_file.h>
94 #include <linux/export.h>
95 
96 /* Set to 3 to get tracing... */
97 #define ACONF_DEBUG 2
98 
99 #if ACONF_DEBUG >= 3
100 #define ADBG(fmt, ...) printk(fmt, ##__VA_ARGS__)
101 #else
102 #define ADBG(fmt, ...) do { if (0) printk(fmt, ##__VA_ARGS__); } while (0)
103 #endif
104 
105 #define	INFINITY_LIFE_TIME	0xFFFFFFFF
106 
107 #define IPV6_MAX_STRLEN \
108 	sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")
109 
110 static inline u32 cstamp_delta(unsigned long cstamp)
111 {
112 	return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
113 }
114 
115 #ifdef CONFIG_SYSCTL
116 static int addrconf_sysctl_register(struct inet6_dev *idev);
117 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
118 #else
119 static inline int addrconf_sysctl_register(struct inet6_dev *idev)
120 {
121 	return 0;
122 }
123 
124 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
125 {
126 }
127 #endif
128 
129 static void __ipv6_regen_rndid(struct inet6_dev *idev);
130 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
131 static void ipv6_regen_rndid(unsigned long data);
132 
133 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
134 static int ipv6_count_addresses(struct inet6_dev *idev);
135 static int ipv6_generate_stable_address(struct in6_addr *addr,
136 					u8 dad_count,
137 					const struct inet6_dev *idev);
138 
139 /*
140  *	Configured unicast address hash table
141  */
142 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
143 static DEFINE_SPINLOCK(addrconf_hash_lock);
144 
145 static void addrconf_verify(void);
146 static void addrconf_verify_rtnl(void);
147 static void addrconf_verify_work(struct work_struct *);
148 
149 static struct workqueue_struct *addrconf_wq;
150 static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work);
151 
152 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
153 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
154 
155 static void addrconf_type_change(struct net_device *dev,
156 				 unsigned long event);
157 static int addrconf_ifdown(struct net_device *dev, int how);
158 
159 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
160 						  int plen,
161 						  const struct net_device *dev,
162 						  u32 flags, u32 noflags);
163 
164 static void addrconf_dad_start(struct inet6_ifaddr *ifp);
165 static void addrconf_dad_work(struct work_struct *w);
166 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
167 static void addrconf_dad_run(struct inet6_dev *idev);
168 static void addrconf_rs_timer(unsigned long data);
169 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
170 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
171 
172 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
173 				struct prefix_info *pinfo);
174 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
175 			       struct net_device *dev);
176 
177 static struct ipv6_devconf ipv6_devconf __read_mostly = {
178 	.forwarding		= 0,
179 	.hop_limit		= IPV6_DEFAULT_HOPLIMIT,
180 	.mtu6			= IPV6_MIN_MTU,
181 	.accept_ra		= 1,
182 	.accept_redirects	= 1,
183 	.autoconf		= 1,
184 	.force_mld_version	= 0,
185 	.mldv1_unsolicited_report_interval = 10 * HZ,
186 	.mldv2_unsolicited_report_interval = HZ,
187 	.dad_transmits		= 1,
188 	.rtr_solicits		= MAX_RTR_SOLICITATIONS,
189 	.rtr_solicit_interval	= RTR_SOLICITATION_INTERVAL,
190 	.rtr_solicit_delay	= MAX_RTR_SOLICITATION_DELAY,
191 	.use_tempaddr		= 0,
192 	.temp_valid_lft		= TEMP_VALID_LIFETIME,
193 	.temp_prefered_lft	= TEMP_PREFERRED_LIFETIME,
194 	.regen_max_retry	= REGEN_MAX_RETRY,
195 	.max_desync_factor	= MAX_DESYNC_FACTOR,
196 	.max_addresses		= IPV6_MAX_ADDRESSES,
197 	.accept_ra_defrtr	= 1,
198 	.accept_ra_from_local	= 0,
199 	.accept_ra_min_hop_limit= 1,
200 	.accept_ra_pinfo	= 1,
201 #ifdef CONFIG_IPV6_ROUTER_PREF
202 	.accept_ra_rtr_pref	= 1,
203 	.rtr_probe_interval	= 60 * HZ,
204 #ifdef CONFIG_IPV6_ROUTE_INFO
205 	.accept_ra_rt_info_max_plen = 0,
206 #endif
207 #endif
208 	.proxy_ndp		= 0,
209 	.accept_source_route	= 0,	/* we do not accept RH0 by default. */
210 	.disable_ipv6		= 0,
211 	.accept_dad		= 1,
212 	.suppress_frag_ndisc	= 1,
213 	.accept_ra_mtu		= 1,
214 	.stable_secret		= {
215 		.initialized = false,
216 	},
217 	.use_oif_addrs_only	= 0,
218 	.ignore_routes_with_linkdown = 0,
219 };
220 
221 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
222 	.forwarding		= 0,
223 	.hop_limit		= IPV6_DEFAULT_HOPLIMIT,
224 	.mtu6			= IPV6_MIN_MTU,
225 	.accept_ra		= 1,
226 	.accept_redirects	= 1,
227 	.autoconf		= 1,
228 	.force_mld_version	= 0,
229 	.mldv1_unsolicited_report_interval = 10 * HZ,
230 	.mldv2_unsolicited_report_interval = HZ,
231 	.dad_transmits		= 1,
232 	.rtr_solicits		= MAX_RTR_SOLICITATIONS,
233 	.rtr_solicit_interval	= RTR_SOLICITATION_INTERVAL,
234 	.rtr_solicit_delay	= MAX_RTR_SOLICITATION_DELAY,
235 	.use_tempaddr		= 0,
236 	.temp_valid_lft		= TEMP_VALID_LIFETIME,
237 	.temp_prefered_lft	= TEMP_PREFERRED_LIFETIME,
238 	.regen_max_retry	= REGEN_MAX_RETRY,
239 	.max_desync_factor	= MAX_DESYNC_FACTOR,
240 	.max_addresses		= IPV6_MAX_ADDRESSES,
241 	.accept_ra_defrtr	= 1,
242 	.accept_ra_from_local	= 0,
243 	.accept_ra_min_hop_limit= 1,
244 	.accept_ra_pinfo	= 1,
245 #ifdef CONFIG_IPV6_ROUTER_PREF
246 	.accept_ra_rtr_pref	= 1,
247 	.rtr_probe_interval	= 60 * HZ,
248 #ifdef CONFIG_IPV6_ROUTE_INFO
249 	.accept_ra_rt_info_max_plen = 0,
250 #endif
251 #endif
252 	.proxy_ndp		= 0,
253 	.accept_source_route	= 0,	/* we do not accept RH0 by default. */
254 	.disable_ipv6		= 0,
255 	.accept_dad		= 1,
256 	.suppress_frag_ndisc	= 1,
257 	.accept_ra_mtu		= 1,
258 	.stable_secret		= {
259 		.initialized = false,
260 	},
261 	.use_oif_addrs_only	= 0,
262 	.ignore_routes_with_linkdown = 0,
263 };
264 
265 /* Check if a valid qdisc is available */
266 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
267 {
268 	return !qdisc_tx_is_noop(dev);
269 }
270 
271 static void addrconf_del_rs_timer(struct inet6_dev *idev)
272 {
273 	if (del_timer(&idev->rs_timer))
274 		__in6_dev_put(idev);
275 }
276 
277 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
278 {
279 	if (cancel_delayed_work(&ifp->dad_work))
280 		__in6_ifa_put(ifp);
281 }
282 
283 static void addrconf_mod_rs_timer(struct inet6_dev *idev,
284 				  unsigned long when)
285 {
286 	if (!timer_pending(&idev->rs_timer))
287 		in6_dev_hold(idev);
288 	mod_timer(&idev->rs_timer, jiffies + when);
289 }
290 
291 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
292 				   unsigned long delay)
293 {
294 	if (!delayed_work_pending(&ifp->dad_work))
295 		in6_ifa_hold(ifp);
296 	mod_delayed_work(addrconf_wq, &ifp->dad_work, delay);
297 }
298 
299 static int snmp6_alloc_dev(struct inet6_dev *idev)
300 {
301 	int i;
302 
303 	idev->stats.ipv6 = alloc_percpu(struct ipstats_mib);
304 	if (!idev->stats.ipv6)
305 		goto err_ip;
306 
307 	for_each_possible_cpu(i) {
308 		struct ipstats_mib *addrconf_stats;
309 		addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
310 		u64_stats_init(&addrconf_stats->syncp);
311 	}
312 
313 
314 	idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
315 					GFP_KERNEL);
316 	if (!idev->stats.icmpv6dev)
317 		goto err_icmp;
318 	idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
319 					   GFP_KERNEL);
320 	if (!idev->stats.icmpv6msgdev)
321 		goto err_icmpmsg;
322 
323 	return 0;
324 
325 err_icmpmsg:
326 	kfree(idev->stats.icmpv6dev);
327 err_icmp:
328 	free_percpu(idev->stats.ipv6);
329 err_ip:
330 	return -ENOMEM;
331 }
332 
333 static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
334 {
335 	struct inet6_dev *ndev;
336 	int err = -ENOMEM;
337 
338 	ASSERT_RTNL();
339 
340 	if (dev->mtu < IPV6_MIN_MTU)
341 		return ERR_PTR(-EINVAL);
342 
343 	ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
344 	if (!ndev)
345 		return ERR_PTR(err);
346 
347 	rwlock_init(&ndev->lock);
348 	ndev->dev = dev;
349 	INIT_LIST_HEAD(&ndev->addr_list);
350 	setup_timer(&ndev->rs_timer, addrconf_rs_timer,
351 		    (unsigned long)ndev);
352 	memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
353 	ndev->cnf.mtu6 = dev->mtu;
354 	ndev->cnf.sysctl = NULL;
355 	ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
356 	if (!ndev->nd_parms) {
357 		kfree(ndev);
358 		return ERR_PTR(err);
359 	}
360 	if (ndev->cnf.forwarding)
361 		dev_disable_lro(dev);
362 	/* We refer to the device */
363 	dev_hold(dev);
364 
365 	if (snmp6_alloc_dev(ndev) < 0) {
366 		ADBG(KERN_WARNING
367 			"%s: cannot allocate memory for statistics; dev=%s.\n",
368 			__func__, dev->name);
369 		neigh_parms_release(&nd_tbl, ndev->nd_parms);
370 		dev_put(dev);
371 		kfree(ndev);
372 		return ERR_PTR(err);
373 	}
374 
375 	if (snmp6_register_dev(ndev) < 0) {
376 		ADBG(KERN_WARNING
377 			"%s: cannot create /proc/net/dev_snmp6/%s\n",
378 			__func__, dev->name);
379 		goto err_release;
380 	}
381 
382 	/* One reference from device.  We must do this before
383 	 * we invoke __ipv6_regen_rndid().
384 	 */
385 	in6_dev_hold(ndev);
386 
387 	if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
388 		ndev->cnf.accept_dad = -1;
389 
390 #if IS_ENABLED(CONFIG_IPV6_SIT)
391 	if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
392 		pr_info("%s: Disabled Multicast RS\n", dev->name);
393 		ndev->cnf.rtr_solicits = 0;
394 	}
395 #endif
396 
397 	INIT_LIST_HEAD(&ndev->tempaddr_list);
398 	setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
399 	if ((dev->flags&IFF_LOOPBACK) ||
400 	    dev->type == ARPHRD_TUNNEL ||
401 	    dev->type == ARPHRD_TUNNEL6 ||
402 	    dev->type == ARPHRD_SIT ||
403 	    dev->type == ARPHRD_NONE) {
404 		ndev->cnf.use_tempaddr = -1;
405 	} else {
406 		in6_dev_hold(ndev);
407 		ipv6_regen_rndid((unsigned long) ndev);
408 	}
409 
410 	ndev->token = in6addr_any;
411 
412 	if (netif_running(dev) && addrconf_qdisc_ok(dev))
413 		ndev->if_flags |= IF_READY;
414 
415 	ipv6_mc_init_dev(ndev);
416 	ndev->tstamp = jiffies;
417 	err = addrconf_sysctl_register(ndev);
418 	if (err) {
419 		ipv6_mc_destroy_dev(ndev);
420 		del_timer(&ndev->regen_timer);
421 		snmp6_unregister_dev(ndev);
422 		goto err_release;
423 	}
424 	/* protected by rtnl_lock */
425 	rcu_assign_pointer(dev->ip6_ptr, ndev);
426 
427 	/* Join interface-local all-node multicast group */
428 	ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
429 
430 	/* Join all-node multicast group */
431 	ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
432 
433 	/* Join all-router multicast group if forwarding is set */
434 	if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
435 		ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
436 
437 	return ndev;
438 
439 err_release:
440 	neigh_parms_release(&nd_tbl, ndev->nd_parms);
441 	ndev->dead = 1;
442 	in6_dev_finish_destroy(ndev);
443 	return ERR_PTR(err);
444 }
445 
446 static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
447 {
448 	struct inet6_dev *idev;
449 
450 	ASSERT_RTNL();
451 
452 	idev = __in6_dev_get(dev);
453 	if (!idev) {
454 		idev = ipv6_add_dev(dev);
455 		if (IS_ERR(idev))
456 			return NULL;
457 	}
458 
459 	if (dev->flags&IFF_UP)
460 		ipv6_mc_up(idev);
461 	return idev;
462 }
463 
464 static int inet6_netconf_msgsize_devconf(int type)
465 {
466 	int size =  NLMSG_ALIGN(sizeof(struct netconfmsg))
467 		    + nla_total_size(4);	/* NETCONFA_IFINDEX */
468 
469 	/* type -1 is used for ALL */
470 	if (type == -1 || type == NETCONFA_FORWARDING)
471 		size += nla_total_size(4);
472 #ifdef CONFIG_IPV6_MROUTE
473 	if (type == -1 || type == NETCONFA_MC_FORWARDING)
474 		size += nla_total_size(4);
475 #endif
476 	if (type == -1 || type == NETCONFA_PROXY_NEIGH)
477 		size += nla_total_size(4);
478 
479 	if (type == -1 || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
480 		size += nla_total_size(4);
481 
482 	return size;
483 }
484 
485 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
486 				      struct ipv6_devconf *devconf, u32 portid,
487 				      u32 seq, int event, unsigned int flags,
488 				      int type)
489 {
490 	struct nlmsghdr  *nlh;
491 	struct netconfmsg *ncm;
492 
493 	nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
494 			flags);
495 	if (!nlh)
496 		return -EMSGSIZE;
497 
498 	ncm = nlmsg_data(nlh);
499 	ncm->ncm_family = AF_INET6;
500 
501 	if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
502 		goto nla_put_failure;
503 
504 	/* type -1 is used for ALL */
505 	if ((type == -1 || type == NETCONFA_FORWARDING) &&
506 	    nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
507 		goto nla_put_failure;
508 #ifdef CONFIG_IPV6_MROUTE
509 	if ((type == -1 || type == NETCONFA_MC_FORWARDING) &&
510 	    nla_put_s32(skb, NETCONFA_MC_FORWARDING,
511 			devconf->mc_forwarding) < 0)
512 		goto nla_put_failure;
513 #endif
514 	if ((type == -1 || type == NETCONFA_PROXY_NEIGH) &&
515 	    nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
516 		goto nla_put_failure;
517 
518 	if ((type == -1 || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
519 	    nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
520 			devconf->ignore_routes_with_linkdown) < 0)
521 		goto nla_put_failure;
522 
523 	nlmsg_end(skb, nlh);
524 	return 0;
525 
526 nla_put_failure:
527 	nlmsg_cancel(skb, nlh);
528 	return -EMSGSIZE;
529 }
530 
531 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
532 				  struct ipv6_devconf *devconf)
533 {
534 	struct sk_buff *skb;
535 	int err = -ENOBUFS;
536 
537 	skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC);
538 	if (!skb)
539 		goto errout;
540 
541 	err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
542 					 RTM_NEWNETCONF, 0, type);
543 	if (err < 0) {
544 		/* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
545 		WARN_ON(err == -EMSGSIZE);
546 		kfree_skb(skb);
547 		goto errout;
548 	}
549 	rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC);
550 	return;
551 errout:
552 	rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
553 }
554 
555 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
556 	[NETCONFA_IFINDEX]	= { .len = sizeof(int) },
557 	[NETCONFA_FORWARDING]	= { .len = sizeof(int) },
558 	[NETCONFA_PROXY_NEIGH]	= { .len = sizeof(int) },
559 	[NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN]	= { .len = sizeof(int) },
560 };
561 
562 static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
563 				     struct nlmsghdr *nlh)
564 {
565 	struct net *net = sock_net(in_skb->sk);
566 	struct nlattr *tb[NETCONFA_MAX+1];
567 	struct netconfmsg *ncm;
568 	struct sk_buff *skb;
569 	struct ipv6_devconf *devconf;
570 	struct inet6_dev *in6_dev;
571 	struct net_device *dev;
572 	int ifindex;
573 	int err;
574 
575 	err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
576 			  devconf_ipv6_policy);
577 	if (err < 0)
578 		goto errout;
579 
580 	err = EINVAL;
581 	if (!tb[NETCONFA_IFINDEX])
582 		goto errout;
583 
584 	ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
585 	switch (ifindex) {
586 	case NETCONFA_IFINDEX_ALL:
587 		devconf = net->ipv6.devconf_all;
588 		break;
589 	case NETCONFA_IFINDEX_DEFAULT:
590 		devconf = net->ipv6.devconf_dflt;
591 		break;
592 	default:
593 		dev = __dev_get_by_index(net, ifindex);
594 		if (!dev)
595 			goto errout;
596 		in6_dev = __in6_dev_get(dev);
597 		if (!in6_dev)
598 			goto errout;
599 		devconf = &in6_dev->cnf;
600 		break;
601 	}
602 
603 	err = -ENOBUFS;
604 	skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC);
605 	if (!skb)
606 		goto errout;
607 
608 	err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
609 					 NETLINK_CB(in_skb).portid,
610 					 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
611 					 -1);
612 	if (err < 0) {
613 		/* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
614 		WARN_ON(err == -EMSGSIZE);
615 		kfree_skb(skb);
616 		goto errout;
617 	}
618 	err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
619 errout:
620 	return err;
621 }
622 
623 static int inet6_netconf_dump_devconf(struct sk_buff *skb,
624 				      struct netlink_callback *cb)
625 {
626 	struct net *net = sock_net(skb->sk);
627 	int h, s_h;
628 	int idx, s_idx;
629 	struct net_device *dev;
630 	struct inet6_dev *idev;
631 	struct hlist_head *head;
632 
633 	s_h = cb->args[0];
634 	s_idx = idx = cb->args[1];
635 
636 	for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
637 		idx = 0;
638 		head = &net->dev_index_head[h];
639 		rcu_read_lock();
640 		cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
641 			  net->dev_base_seq;
642 		hlist_for_each_entry_rcu(dev, head, index_hlist) {
643 			if (idx < s_idx)
644 				goto cont;
645 			idev = __in6_dev_get(dev);
646 			if (!idev)
647 				goto cont;
648 
649 			if (inet6_netconf_fill_devconf(skb, dev->ifindex,
650 						       &idev->cnf,
651 						       NETLINK_CB(cb->skb).portid,
652 						       cb->nlh->nlmsg_seq,
653 						       RTM_NEWNETCONF,
654 						       NLM_F_MULTI,
655 						       -1) < 0) {
656 				rcu_read_unlock();
657 				goto done;
658 			}
659 			nl_dump_check_consistent(cb, nlmsg_hdr(skb));
660 cont:
661 			idx++;
662 		}
663 		rcu_read_unlock();
664 	}
665 	if (h == NETDEV_HASHENTRIES) {
666 		if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
667 					       net->ipv6.devconf_all,
668 					       NETLINK_CB(cb->skb).portid,
669 					       cb->nlh->nlmsg_seq,
670 					       RTM_NEWNETCONF, NLM_F_MULTI,
671 					       -1) < 0)
672 			goto done;
673 		else
674 			h++;
675 	}
676 	if (h == NETDEV_HASHENTRIES + 1) {
677 		if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
678 					       net->ipv6.devconf_dflt,
679 					       NETLINK_CB(cb->skb).portid,
680 					       cb->nlh->nlmsg_seq,
681 					       RTM_NEWNETCONF, NLM_F_MULTI,
682 					       -1) < 0)
683 			goto done;
684 		else
685 			h++;
686 	}
687 done:
688 	cb->args[0] = h;
689 	cb->args[1] = idx;
690 
691 	return skb->len;
692 }
693 
694 #ifdef CONFIG_SYSCTL
695 static void dev_forward_change(struct inet6_dev *idev)
696 {
697 	struct net_device *dev;
698 	struct inet6_ifaddr *ifa;
699 
700 	if (!idev)
701 		return;
702 	dev = idev->dev;
703 	if (idev->cnf.forwarding)
704 		dev_disable_lro(dev);
705 	if (dev->flags & IFF_MULTICAST) {
706 		if (idev->cnf.forwarding) {
707 			ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
708 			ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
709 			ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
710 		} else {
711 			ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
712 			ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
713 			ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
714 		}
715 	}
716 
717 	list_for_each_entry(ifa, &idev->addr_list, if_list) {
718 		if (ifa->flags&IFA_F_TENTATIVE)
719 			continue;
720 		if (idev->cnf.forwarding)
721 			addrconf_join_anycast(ifa);
722 		else
723 			addrconf_leave_anycast(ifa);
724 	}
725 	inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
726 				     dev->ifindex, &idev->cnf);
727 }
728 
729 
730 static void addrconf_forward_change(struct net *net, __s32 newf)
731 {
732 	struct net_device *dev;
733 	struct inet6_dev *idev;
734 
735 	for_each_netdev(net, dev) {
736 		idev = __in6_dev_get(dev);
737 		if (idev) {
738 			int changed = (!idev->cnf.forwarding) ^ (!newf);
739 			idev->cnf.forwarding = newf;
740 			if (changed)
741 				dev_forward_change(idev);
742 		}
743 	}
744 }
745 
746 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
747 {
748 	struct net *net;
749 	int old;
750 
751 	if (!rtnl_trylock())
752 		return restart_syscall();
753 
754 	net = (struct net *)table->extra2;
755 	old = *p;
756 	*p = newf;
757 
758 	if (p == &net->ipv6.devconf_dflt->forwarding) {
759 		if ((!newf) ^ (!old))
760 			inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
761 						     NETCONFA_IFINDEX_DEFAULT,
762 						     net->ipv6.devconf_dflt);
763 		rtnl_unlock();
764 		return 0;
765 	}
766 
767 	if (p == &net->ipv6.devconf_all->forwarding) {
768 		net->ipv6.devconf_dflt->forwarding = newf;
769 		addrconf_forward_change(net, newf);
770 		if ((!newf) ^ (!old))
771 			inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
772 						     NETCONFA_IFINDEX_ALL,
773 						     net->ipv6.devconf_all);
774 	} else if ((!newf) ^ (!old))
775 		dev_forward_change((struct inet6_dev *)table->extra1);
776 	rtnl_unlock();
777 
778 	if (newf)
779 		rt6_purge_dflt_routers(net);
780 	return 1;
781 }
782 
783 static void addrconf_linkdown_change(struct net *net, __s32 newf)
784 {
785 	struct net_device *dev;
786 	struct inet6_dev *idev;
787 
788 	for_each_netdev(net, dev) {
789 		idev = __in6_dev_get(dev);
790 		if (idev) {
791 			int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
792 
793 			idev->cnf.ignore_routes_with_linkdown = newf;
794 			if (changed)
795 				inet6_netconf_notify_devconf(dev_net(dev),
796 							     NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
797 							     dev->ifindex,
798 							     &idev->cnf);
799 		}
800 	}
801 }
802 
803 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf)
804 {
805 	struct net *net;
806 	int old;
807 
808 	if (!rtnl_trylock())
809 		return restart_syscall();
810 
811 	net = (struct net *)table->extra2;
812 	old = *p;
813 	*p = newf;
814 
815 	if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
816 		if ((!newf) ^ (!old))
817 			inet6_netconf_notify_devconf(net,
818 						     NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
819 						     NETCONFA_IFINDEX_DEFAULT,
820 						     net->ipv6.devconf_dflt);
821 		rtnl_unlock();
822 		return 0;
823 	}
824 
825 	if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
826 		net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf;
827 		addrconf_linkdown_change(net, newf);
828 		if ((!newf) ^ (!old))
829 			inet6_netconf_notify_devconf(net,
830 						     NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
831 						     NETCONFA_IFINDEX_ALL,
832 						     net->ipv6.devconf_all);
833 	}
834 	rtnl_unlock();
835 
836 	return 1;
837 }
838 
839 #endif
840 
841 /* Nobody refers to this ifaddr, destroy it */
842 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
843 {
844 	WARN_ON(!hlist_unhashed(&ifp->addr_lst));
845 
846 #ifdef NET_REFCNT_DEBUG
847 	pr_debug("%s\n", __func__);
848 #endif
849 
850 	in6_dev_put(ifp->idev);
851 
852 	if (cancel_delayed_work(&ifp->dad_work))
853 		pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
854 			  ifp);
855 
856 	if (ifp->state != INET6_IFADDR_STATE_DEAD) {
857 		pr_warn("Freeing alive inet6 address %p\n", ifp);
858 		return;
859 	}
860 	ip6_rt_put(ifp->rt);
861 
862 	kfree_rcu(ifp, rcu);
863 }
864 
865 static void
866 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
867 {
868 	struct list_head *p;
869 	int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
870 
871 	/*
872 	 * Each device address list is sorted in order of scope -
873 	 * global before linklocal.
874 	 */
875 	list_for_each(p, &idev->addr_list) {
876 		struct inet6_ifaddr *ifa
877 			= list_entry(p, struct inet6_ifaddr, if_list);
878 		if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
879 			break;
880 	}
881 
882 	list_add_tail(&ifp->if_list, p);
883 }
884 
885 static u32 inet6_addr_hash(const struct in6_addr *addr)
886 {
887 	return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
888 }
889 
890 /* On success it returns ifp with increased reference count */
891 
892 static struct inet6_ifaddr *
893 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
894 	      const struct in6_addr *peer_addr, int pfxlen,
895 	      int scope, u32 flags, u32 valid_lft, u32 prefered_lft)
896 {
897 	struct inet6_ifaddr *ifa = NULL;
898 	struct rt6_info *rt;
899 	unsigned int hash;
900 	int err = 0;
901 	int addr_type = ipv6_addr_type(addr);
902 
903 	if (addr_type == IPV6_ADDR_ANY ||
904 	    addr_type & IPV6_ADDR_MULTICAST ||
905 	    (!(idev->dev->flags & IFF_LOOPBACK) &&
906 	     addr_type & IPV6_ADDR_LOOPBACK))
907 		return ERR_PTR(-EADDRNOTAVAIL);
908 
909 	rcu_read_lock_bh();
910 	if (idev->dead) {
911 		err = -ENODEV;			/*XXX*/
912 		goto out2;
913 	}
914 
915 	if (idev->cnf.disable_ipv6) {
916 		err = -EACCES;
917 		goto out2;
918 	}
919 
920 	spin_lock(&addrconf_hash_lock);
921 
922 	/* Ignore adding duplicate addresses on an interface */
923 	if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
924 		ADBG("ipv6_add_addr: already assigned\n");
925 		err = -EEXIST;
926 		goto out;
927 	}
928 
929 	ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
930 
931 	if (!ifa) {
932 		ADBG("ipv6_add_addr: malloc failed\n");
933 		err = -ENOBUFS;
934 		goto out;
935 	}
936 
937 	rt = addrconf_dst_alloc(idev, addr, false);
938 	if (IS_ERR(rt)) {
939 		err = PTR_ERR(rt);
940 		goto out;
941 	}
942 
943 	neigh_parms_data_state_setall(idev->nd_parms);
944 
945 	ifa->addr = *addr;
946 	if (peer_addr)
947 		ifa->peer_addr = *peer_addr;
948 
949 	spin_lock_init(&ifa->lock);
950 	INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
951 	INIT_HLIST_NODE(&ifa->addr_lst);
952 	ifa->scope = scope;
953 	ifa->prefix_len = pfxlen;
954 	ifa->flags = flags | IFA_F_TENTATIVE;
955 	ifa->valid_lft = valid_lft;
956 	ifa->prefered_lft = prefered_lft;
957 	ifa->cstamp = ifa->tstamp = jiffies;
958 	ifa->tokenized = false;
959 
960 	ifa->rt = rt;
961 
962 	ifa->idev = idev;
963 	in6_dev_hold(idev);
964 	/* For caller */
965 	in6_ifa_hold(ifa);
966 
967 	/* Add to big hash table */
968 	hash = inet6_addr_hash(addr);
969 
970 	hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
971 	spin_unlock(&addrconf_hash_lock);
972 
973 	write_lock(&idev->lock);
974 	/* Add to inet6_dev unicast addr list. */
975 	ipv6_link_dev_addr(idev, ifa);
976 
977 	if (ifa->flags&IFA_F_TEMPORARY) {
978 		list_add(&ifa->tmp_list, &idev->tempaddr_list);
979 		in6_ifa_hold(ifa);
980 	}
981 
982 	in6_ifa_hold(ifa);
983 	write_unlock(&idev->lock);
984 out2:
985 	rcu_read_unlock_bh();
986 
987 	if (likely(err == 0))
988 		inet6addr_notifier_call_chain(NETDEV_UP, ifa);
989 	else {
990 		kfree(ifa);
991 		ifa = ERR_PTR(err);
992 	}
993 
994 	return ifa;
995 out:
996 	spin_unlock(&addrconf_hash_lock);
997 	goto out2;
998 }
999 
1000 enum cleanup_prefix_rt_t {
1001 	CLEANUP_PREFIX_RT_NOP,    /* no cleanup action for prefix route */
1002 	CLEANUP_PREFIX_RT_DEL,    /* delete the prefix route */
1003 	CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1004 };
1005 
1006 /*
1007  * Check, whether the prefix for ifp would still need a prefix route
1008  * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1009  * constants.
1010  *
1011  * 1) we don't purge prefix if address was not permanent.
1012  *    prefix is managed by its own lifetime.
1013  * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1014  * 3) if there are no addresses, delete prefix.
1015  * 4) if there are still other permanent address(es),
1016  *    corresponding prefix is still permanent.
1017  * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1018  *    don't purge the prefix, assume user space is managing it.
1019  * 6) otherwise, update prefix lifetime to the
1020  *    longest valid lifetime among the corresponding
1021  *    addresses on the device.
1022  *    Note: subsequent RA will update lifetime.
1023  **/
1024 static enum cleanup_prefix_rt_t
1025 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1026 {
1027 	struct inet6_ifaddr *ifa;
1028 	struct inet6_dev *idev = ifp->idev;
1029 	unsigned long lifetime;
1030 	enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1031 
1032 	*expires = jiffies;
1033 
1034 	list_for_each_entry(ifa, &idev->addr_list, if_list) {
1035 		if (ifa == ifp)
1036 			continue;
1037 		if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr,
1038 				       ifp->prefix_len))
1039 			continue;
1040 		if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1041 			return CLEANUP_PREFIX_RT_NOP;
1042 
1043 		action = CLEANUP_PREFIX_RT_EXPIRE;
1044 
1045 		spin_lock(&ifa->lock);
1046 
1047 		lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1048 		/*
1049 		 * Note: Because this address is
1050 		 * not permanent, lifetime <
1051 		 * LONG_MAX / HZ here.
1052 		 */
1053 		if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1054 			*expires = ifa->tstamp + lifetime * HZ;
1055 		spin_unlock(&ifa->lock);
1056 	}
1057 
1058 	return action;
1059 }
1060 
1061 static void
1062 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
1063 {
1064 	struct rt6_info *rt;
1065 
1066 	rt = addrconf_get_prefix_route(&ifp->addr,
1067 				       ifp->prefix_len,
1068 				       ifp->idev->dev,
1069 				       0, RTF_GATEWAY | RTF_DEFAULT);
1070 	if (rt) {
1071 		if (del_rt)
1072 			ip6_del_rt(rt);
1073 		else {
1074 			if (!(rt->rt6i_flags & RTF_EXPIRES))
1075 				rt6_set_expires(rt, expires);
1076 			ip6_rt_put(rt);
1077 		}
1078 	}
1079 }
1080 
1081 
1082 /* This function wants to get referenced ifp and releases it before return */
1083 
1084 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1085 {
1086 	int state;
1087 	enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1088 	unsigned long expires;
1089 
1090 	ASSERT_RTNL();
1091 
1092 	spin_lock_bh(&ifp->lock);
1093 	state = ifp->state;
1094 	ifp->state = INET6_IFADDR_STATE_DEAD;
1095 	spin_unlock_bh(&ifp->lock);
1096 
1097 	if (state == INET6_IFADDR_STATE_DEAD)
1098 		goto out;
1099 
1100 	spin_lock_bh(&addrconf_hash_lock);
1101 	hlist_del_init_rcu(&ifp->addr_lst);
1102 	spin_unlock_bh(&addrconf_hash_lock);
1103 
1104 	write_lock_bh(&ifp->idev->lock);
1105 
1106 	if (ifp->flags&IFA_F_TEMPORARY) {
1107 		list_del(&ifp->tmp_list);
1108 		if (ifp->ifpub) {
1109 			in6_ifa_put(ifp->ifpub);
1110 			ifp->ifpub = NULL;
1111 		}
1112 		__in6_ifa_put(ifp);
1113 	}
1114 
1115 	if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1116 		action = check_cleanup_prefix_route(ifp, &expires);
1117 
1118 	list_del_init(&ifp->if_list);
1119 	__in6_ifa_put(ifp);
1120 
1121 	write_unlock_bh(&ifp->idev->lock);
1122 
1123 	addrconf_del_dad_work(ifp);
1124 
1125 	ipv6_ifa_notify(RTM_DELADDR, ifp);
1126 
1127 	inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1128 
1129 	if (action != CLEANUP_PREFIX_RT_NOP) {
1130 		cleanup_prefix_route(ifp, expires,
1131 			action == CLEANUP_PREFIX_RT_DEL);
1132 	}
1133 
1134 	/* clean up prefsrc entries */
1135 	rt6_remove_prefsrc(ifp);
1136 out:
1137 	in6_ifa_put(ifp);
1138 }
1139 
1140 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1141 {
1142 	struct inet6_dev *idev = ifp->idev;
1143 	struct in6_addr addr, *tmpaddr;
1144 	unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
1145 	unsigned long regen_advance;
1146 	int tmp_plen;
1147 	int ret = 0;
1148 	u32 addr_flags;
1149 	unsigned long now = jiffies;
1150 
1151 	write_lock_bh(&idev->lock);
1152 	if (ift) {
1153 		spin_lock_bh(&ift->lock);
1154 		memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1155 		spin_unlock_bh(&ift->lock);
1156 		tmpaddr = &addr;
1157 	} else {
1158 		tmpaddr = NULL;
1159 	}
1160 retry:
1161 	in6_dev_hold(idev);
1162 	if (idev->cnf.use_tempaddr <= 0) {
1163 		write_unlock_bh(&idev->lock);
1164 		pr_info("%s: use_tempaddr is disabled\n", __func__);
1165 		in6_dev_put(idev);
1166 		ret = -1;
1167 		goto out;
1168 	}
1169 	spin_lock_bh(&ifp->lock);
1170 	if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1171 		idev->cnf.use_tempaddr = -1;	/*XXX*/
1172 		spin_unlock_bh(&ifp->lock);
1173 		write_unlock_bh(&idev->lock);
1174 		pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1175 			__func__);
1176 		in6_dev_put(idev);
1177 		ret = -1;
1178 		goto out;
1179 	}
1180 	in6_ifa_hold(ifp);
1181 	memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1182 	__ipv6_try_regen_rndid(idev, tmpaddr);
1183 	memcpy(&addr.s6_addr[8], idev->rndid, 8);
1184 	age = (now - ifp->tstamp) / HZ;
1185 	tmp_valid_lft = min_t(__u32,
1186 			      ifp->valid_lft,
1187 			      idev->cnf.temp_valid_lft + age);
1188 	tmp_prefered_lft = min_t(__u32,
1189 				 ifp->prefered_lft,
1190 				 idev->cnf.temp_prefered_lft + age -
1191 				 idev->cnf.max_desync_factor);
1192 	tmp_plen = ifp->prefix_len;
1193 	tmp_tstamp = ifp->tstamp;
1194 	spin_unlock_bh(&ifp->lock);
1195 
1196 	regen_advance = idev->cnf.regen_max_retry *
1197 			idev->cnf.dad_transmits *
1198 			NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
1199 	write_unlock_bh(&idev->lock);
1200 
1201 	/* A temporary address is created only if this calculated Preferred
1202 	 * Lifetime is greater than REGEN_ADVANCE time units.  In particular,
1203 	 * an implementation must not create a temporary address with a zero
1204 	 * Preferred Lifetime.
1205 	 * Use age calculation as in addrconf_verify to avoid unnecessary
1206 	 * temporary addresses being generated.
1207 	 */
1208 	age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1209 	if (tmp_prefered_lft <= regen_advance + age) {
1210 		in6_ifa_put(ifp);
1211 		in6_dev_put(idev);
1212 		ret = -1;
1213 		goto out;
1214 	}
1215 
1216 	addr_flags = IFA_F_TEMPORARY;
1217 	/* set in addrconf_prefix_rcv() */
1218 	if (ifp->flags & IFA_F_OPTIMISTIC)
1219 		addr_flags |= IFA_F_OPTIMISTIC;
1220 
1221 	ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1222 			    ipv6_addr_scope(&addr), addr_flags,
1223 			    tmp_valid_lft, tmp_prefered_lft);
1224 	if (IS_ERR(ift)) {
1225 		in6_ifa_put(ifp);
1226 		in6_dev_put(idev);
1227 		pr_info("%s: retry temporary address regeneration\n", __func__);
1228 		tmpaddr = &addr;
1229 		write_lock_bh(&idev->lock);
1230 		goto retry;
1231 	}
1232 
1233 	spin_lock_bh(&ift->lock);
1234 	ift->ifpub = ifp;
1235 	ift->cstamp = now;
1236 	ift->tstamp = tmp_tstamp;
1237 	spin_unlock_bh(&ift->lock);
1238 
1239 	addrconf_dad_start(ift);
1240 	in6_ifa_put(ift);
1241 	in6_dev_put(idev);
1242 out:
1243 	return ret;
1244 }
1245 
1246 /*
1247  *	Choose an appropriate source address (RFC3484)
1248  */
1249 enum {
1250 	IPV6_SADDR_RULE_INIT = 0,
1251 	IPV6_SADDR_RULE_LOCAL,
1252 	IPV6_SADDR_RULE_SCOPE,
1253 	IPV6_SADDR_RULE_PREFERRED,
1254 #ifdef CONFIG_IPV6_MIP6
1255 	IPV6_SADDR_RULE_HOA,
1256 #endif
1257 	IPV6_SADDR_RULE_OIF,
1258 	IPV6_SADDR_RULE_LABEL,
1259 	IPV6_SADDR_RULE_PRIVACY,
1260 	IPV6_SADDR_RULE_ORCHID,
1261 	IPV6_SADDR_RULE_PREFIX,
1262 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1263 	IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1264 #endif
1265 	IPV6_SADDR_RULE_MAX
1266 };
1267 
1268 struct ipv6_saddr_score {
1269 	int			rule;
1270 	int			addr_type;
1271 	struct inet6_ifaddr	*ifa;
1272 	DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1273 	int			scopedist;
1274 	int			matchlen;
1275 };
1276 
1277 struct ipv6_saddr_dst {
1278 	const struct in6_addr *addr;
1279 	int ifindex;
1280 	int scope;
1281 	int label;
1282 	unsigned int prefs;
1283 };
1284 
1285 static inline int ipv6_saddr_preferred(int type)
1286 {
1287 	if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1288 		return 1;
1289 	return 0;
1290 }
1291 
1292 static inline bool ipv6_use_optimistic_addr(struct inet6_dev *idev)
1293 {
1294 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1295 	return idev && idev->cnf.optimistic_dad && idev->cnf.use_optimistic;
1296 #else
1297 	return false;
1298 #endif
1299 }
1300 
1301 static int ipv6_get_saddr_eval(struct net *net,
1302 			       struct ipv6_saddr_score *score,
1303 			       struct ipv6_saddr_dst *dst,
1304 			       int i)
1305 {
1306 	int ret;
1307 
1308 	if (i <= score->rule) {
1309 		switch (i) {
1310 		case IPV6_SADDR_RULE_SCOPE:
1311 			ret = score->scopedist;
1312 			break;
1313 		case IPV6_SADDR_RULE_PREFIX:
1314 			ret = score->matchlen;
1315 			break;
1316 		default:
1317 			ret = !!test_bit(i, score->scorebits);
1318 		}
1319 		goto out;
1320 	}
1321 
1322 	switch (i) {
1323 	case IPV6_SADDR_RULE_INIT:
1324 		/* Rule 0: remember if hiscore is not ready yet */
1325 		ret = !!score->ifa;
1326 		break;
1327 	case IPV6_SADDR_RULE_LOCAL:
1328 		/* Rule 1: Prefer same address */
1329 		ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1330 		break;
1331 	case IPV6_SADDR_RULE_SCOPE:
1332 		/* Rule 2: Prefer appropriate scope
1333 		 *
1334 		 *      ret
1335 		 *       ^
1336 		 *    -1 |  d 15
1337 		 *    ---+--+-+---> scope
1338 		 *       |
1339 		 *       |             d is scope of the destination.
1340 		 *  B-d  |  \
1341 		 *       |   \      <- smaller scope is better if
1342 		 *  B-15 |    \        if scope is enough for destination.
1343 		 *       |             ret = B - scope (-1 <= scope >= d <= 15).
1344 		 * d-C-1 | /
1345 		 *       |/         <- greater is better
1346 		 *   -C  /             if scope is not enough for destination.
1347 		 *      /|             ret = scope - C (-1 <= d < scope <= 15).
1348 		 *
1349 		 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1350 		 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1351 		 * Assume B = 0 and we get C > 29.
1352 		 */
1353 		ret = __ipv6_addr_src_scope(score->addr_type);
1354 		if (ret >= dst->scope)
1355 			ret = -ret;
1356 		else
1357 			ret -= 128;	/* 30 is enough */
1358 		score->scopedist = ret;
1359 		break;
1360 	case IPV6_SADDR_RULE_PREFERRED:
1361 	    {
1362 		/* Rule 3: Avoid deprecated and optimistic addresses */
1363 		u8 avoid = IFA_F_DEPRECATED;
1364 
1365 		if (!ipv6_use_optimistic_addr(score->ifa->idev))
1366 			avoid |= IFA_F_OPTIMISTIC;
1367 		ret = ipv6_saddr_preferred(score->addr_type) ||
1368 		      !(score->ifa->flags & avoid);
1369 		break;
1370 	    }
1371 #ifdef CONFIG_IPV6_MIP6
1372 	case IPV6_SADDR_RULE_HOA:
1373 	    {
1374 		/* Rule 4: Prefer home address */
1375 		int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1376 		ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1377 		break;
1378 	    }
1379 #endif
1380 	case IPV6_SADDR_RULE_OIF:
1381 		/* Rule 5: Prefer outgoing interface */
1382 		ret = (!dst->ifindex ||
1383 		       dst->ifindex == score->ifa->idev->dev->ifindex);
1384 		break;
1385 	case IPV6_SADDR_RULE_LABEL:
1386 		/* Rule 6: Prefer matching label */
1387 		ret = ipv6_addr_label(net,
1388 				      &score->ifa->addr, score->addr_type,
1389 				      score->ifa->idev->dev->ifindex) == dst->label;
1390 		break;
1391 	case IPV6_SADDR_RULE_PRIVACY:
1392 	    {
1393 		/* Rule 7: Prefer public address
1394 		 * Note: prefer temporary address if use_tempaddr >= 2
1395 		 */
1396 		int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1397 				!!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1398 				score->ifa->idev->cnf.use_tempaddr >= 2;
1399 		ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1400 		break;
1401 	    }
1402 	case IPV6_SADDR_RULE_ORCHID:
1403 		/* Rule 8-: Prefer ORCHID vs ORCHID or
1404 		 *	    non-ORCHID vs non-ORCHID
1405 		 */
1406 		ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1407 			ipv6_addr_orchid(dst->addr));
1408 		break;
1409 	case IPV6_SADDR_RULE_PREFIX:
1410 		/* Rule 8: Use longest matching prefix */
1411 		ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1412 		if (ret > score->ifa->prefix_len)
1413 			ret = score->ifa->prefix_len;
1414 		score->matchlen = ret;
1415 		break;
1416 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1417 	case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1418 		/* Optimistic addresses still have lower precedence than other
1419 		 * preferred addresses.
1420 		 */
1421 		ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1422 		break;
1423 #endif
1424 	default:
1425 		ret = 0;
1426 	}
1427 
1428 	if (ret)
1429 		__set_bit(i, score->scorebits);
1430 	score->rule = i;
1431 out:
1432 	return ret;
1433 }
1434 
1435 static int __ipv6_dev_get_saddr(struct net *net,
1436 				struct ipv6_saddr_dst *dst,
1437 				struct inet6_dev *idev,
1438 				struct ipv6_saddr_score *scores,
1439 				int hiscore_idx)
1440 {
1441 	struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
1442 
1443 	read_lock_bh(&idev->lock);
1444 	list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1445 		int i;
1446 
1447 		/*
1448 		 * - Tentative Address (RFC2462 section 5.4)
1449 		 *  - A tentative address is not considered
1450 		 *    "assigned to an interface" in the traditional
1451 		 *    sense, unless it is also flagged as optimistic.
1452 		 * - Candidate Source Address (section 4)
1453 		 *  - In any case, anycast addresses, multicast
1454 		 *    addresses, and the unspecified address MUST
1455 		 *    NOT be included in a candidate set.
1456 		 */
1457 		if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1458 		    (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1459 			continue;
1460 
1461 		score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1462 
1463 		if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1464 			     score->addr_type & IPV6_ADDR_MULTICAST)) {
1465 			net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1466 					    idev->dev->name);
1467 			continue;
1468 		}
1469 
1470 		score->rule = -1;
1471 		bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1472 
1473 		for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1474 			int minihiscore, miniscore;
1475 
1476 			minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1477 			miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1478 
1479 			if (minihiscore > miniscore) {
1480 				if (i == IPV6_SADDR_RULE_SCOPE &&
1481 				    score->scopedist > 0) {
1482 					/*
1483 					 * special case:
1484 					 * each remaining entry
1485 					 * has too small (not enough)
1486 					 * scope, because ifa entries
1487 					 * are sorted by their scope
1488 					 * values.
1489 					 */
1490 					goto out;
1491 				}
1492 				break;
1493 			} else if (minihiscore < miniscore) {
1494 				if (hiscore->ifa)
1495 					in6_ifa_put(hiscore->ifa);
1496 
1497 				in6_ifa_hold(score->ifa);
1498 
1499 				swap(hiscore, score);
1500 				hiscore_idx = 1 - hiscore_idx;
1501 
1502 				/* restore our iterator */
1503 				score->ifa = hiscore->ifa;
1504 
1505 				break;
1506 			}
1507 		}
1508 	}
1509 out:
1510 	read_unlock_bh(&idev->lock);
1511 	return hiscore_idx;
1512 }
1513 
1514 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1515 		       const struct in6_addr *daddr, unsigned int prefs,
1516 		       struct in6_addr *saddr)
1517 {
1518 	struct ipv6_saddr_score scores[2], *hiscore;
1519 	struct ipv6_saddr_dst dst;
1520 	struct inet6_dev *idev;
1521 	struct net_device *dev;
1522 	int dst_type;
1523 	bool use_oif_addr = false;
1524 	int hiscore_idx = 0;
1525 
1526 	dst_type = __ipv6_addr_type(daddr);
1527 	dst.addr = daddr;
1528 	dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1529 	dst.scope = __ipv6_addr_src_scope(dst_type);
1530 	dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1531 	dst.prefs = prefs;
1532 
1533 	scores[hiscore_idx].rule = -1;
1534 	scores[hiscore_idx].ifa = NULL;
1535 
1536 	rcu_read_lock();
1537 
1538 	/* Candidate Source Address (section 4)
1539 	 *  - multicast and link-local destination address,
1540 	 *    the set of candidate source address MUST only
1541 	 *    include addresses assigned to interfaces
1542 	 *    belonging to the same link as the outgoing
1543 	 *    interface.
1544 	 * (- For site-local destination addresses, the
1545 	 *    set of candidate source addresses MUST only
1546 	 *    include addresses assigned to interfaces
1547 	 *    belonging to the same site as the outgoing
1548 	 *    interface.)
1549 	 *  - "It is RECOMMENDED that the candidate source addresses
1550 	 *    be the set of unicast addresses assigned to the
1551 	 *    interface that will be used to send to the destination
1552 	 *    (the 'outgoing' interface)." (RFC 6724)
1553 	 */
1554 	if (dst_dev) {
1555 		idev = __in6_dev_get(dst_dev);
1556 		if ((dst_type & IPV6_ADDR_MULTICAST) ||
1557 		    dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1558 		    (idev && idev->cnf.use_oif_addrs_only)) {
1559 			use_oif_addr = true;
1560 		}
1561 	}
1562 
1563 	if (use_oif_addr) {
1564 		if (idev)
1565 			hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1566 	} else {
1567 		for_each_netdev_rcu(net, dev) {
1568 			idev = __in6_dev_get(dev);
1569 			if (!idev)
1570 				continue;
1571 			hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1572 		}
1573 	}
1574 	rcu_read_unlock();
1575 
1576 	hiscore = &scores[hiscore_idx];
1577 	if (!hiscore->ifa)
1578 		return -EADDRNOTAVAIL;
1579 
1580 	*saddr = hiscore->ifa->addr;
1581 	in6_ifa_put(hiscore->ifa);
1582 	return 0;
1583 }
1584 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1585 
1586 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1587 		      u32 banned_flags)
1588 {
1589 	struct inet6_ifaddr *ifp;
1590 	int err = -EADDRNOTAVAIL;
1591 
1592 	list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1593 		if (ifp->scope > IFA_LINK)
1594 			break;
1595 		if (ifp->scope == IFA_LINK &&
1596 		    !(ifp->flags & banned_flags)) {
1597 			*addr = ifp->addr;
1598 			err = 0;
1599 			break;
1600 		}
1601 	}
1602 	return err;
1603 }
1604 
1605 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1606 		    u32 banned_flags)
1607 {
1608 	struct inet6_dev *idev;
1609 	int err = -EADDRNOTAVAIL;
1610 
1611 	rcu_read_lock();
1612 	idev = __in6_dev_get(dev);
1613 	if (idev) {
1614 		read_lock_bh(&idev->lock);
1615 		err = __ipv6_get_lladdr(idev, addr, banned_flags);
1616 		read_unlock_bh(&idev->lock);
1617 	}
1618 	rcu_read_unlock();
1619 	return err;
1620 }
1621 
1622 static int ipv6_count_addresses(struct inet6_dev *idev)
1623 {
1624 	int cnt = 0;
1625 	struct inet6_ifaddr *ifp;
1626 
1627 	read_lock_bh(&idev->lock);
1628 	list_for_each_entry(ifp, &idev->addr_list, if_list)
1629 		cnt++;
1630 	read_unlock_bh(&idev->lock);
1631 	return cnt;
1632 }
1633 
1634 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1635 		  const struct net_device *dev, int strict)
1636 {
1637 	return ipv6_chk_addr_and_flags(net, addr, dev, strict, IFA_F_TENTATIVE);
1638 }
1639 EXPORT_SYMBOL(ipv6_chk_addr);
1640 
1641 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1642 			    const struct net_device *dev, int strict,
1643 			    u32 banned_flags)
1644 {
1645 	struct inet6_ifaddr *ifp;
1646 	unsigned int hash = inet6_addr_hash(addr);
1647 	u32 ifp_flags;
1648 
1649 	rcu_read_lock_bh();
1650 	hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1651 		if (!net_eq(dev_net(ifp->idev->dev), net))
1652 			continue;
1653 		/* Decouple optimistic from tentative for evaluation here.
1654 		 * Ban optimistic addresses explicitly, when required.
1655 		 */
1656 		ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1657 			    ? (ifp->flags&~IFA_F_TENTATIVE)
1658 			    : ifp->flags;
1659 		if (ipv6_addr_equal(&ifp->addr, addr) &&
1660 		    !(ifp_flags&banned_flags) &&
1661 		    (!dev || ifp->idev->dev == dev ||
1662 		     !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1663 			rcu_read_unlock_bh();
1664 			return 1;
1665 		}
1666 	}
1667 
1668 	rcu_read_unlock_bh();
1669 	return 0;
1670 }
1671 EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
1672 
1673 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1674 			       struct net_device *dev)
1675 {
1676 	unsigned int hash = inet6_addr_hash(addr);
1677 	struct inet6_ifaddr *ifp;
1678 
1679 	hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
1680 		if (!net_eq(dev_net(ifp->idev->dev), net))
1681 			continue;
1682 		if (ipv6_addr_equal(&ifp->addr, addr)) {
1683 			if (!dev || ifp->idev->dev == dev)
1684 				return true;
1685 		}
1686 	}
1687 	return false;
1688 }
1689 
1690 /* Compares an address/prefix_len with addresses on device @dev.
1691  * If one is found it returns true.
1692  */
1693 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1694 	const unsigned int prefix_len, struct net_device *dev)
1695 {
1696 	struct inet6_dev *idev;
1697 	struct inet6_ifaddr *ifa;
1698 	bool ret = false;
1699 
1700 	rcu_read_lock();
1701 	idev = __in6_dev_get(dev);
1702 	if (idev) {
1703 		read_lock_bh(&idev->lock);
1704 		list_for_each_entry(ifa, &idev->addr_list, if_list) {
1705 			ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1706 			if (ret)
1707 				break;
1708 		}
1709 		read_unlock_bh(&idev->lock);
1710 	}
1711 	rcu_read_unlock();
1712 
1713 	return ret;
1714 }
1715 EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1716 
1717 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1718 {
1719 	struct inet6_dev *idev;
1720 	struct inet6_ifaddr *ifa;
1721 	int	onlink;
1722 
1723 	onlink = 0;
1724 	rcu_read_lock();
1725 	idev = __in6_dev_get(dev);
1726 	if (idev) {
1727 		read_lock_bh(&idev->lock);
1728 		list_for_each_entry(ifa, &idev->addr_list, if_list) {
1729 			onlink = ipv6_prefix_equal(addr, &ifa->addr,
1730 						   ifa->prefix_len);
1731 			if (onlink)
1732 				break;
1733 		}
1734 		read_unlock_bh(&idev->lock);
1735 	}
1736 	rcu_read_unlock();
1737 	return onlink;
1738 }
1739 EXPORT_SYMBOL(ipv6_chk_prefix);
1740 
1741 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1742 				     struct net_device *dev, int strict)
1743 {
1744 	struct inet6_ifaddr *ifp, *result = NULL;
1745 	unsigned int hash = inet6_addr_hash(addr);
1746 
1747 	rcu_read_lock_bh();
1748 	hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
1749 		if (!net_eq(dev_net(ifp->idev->dev), net))
1750 			continue;
1751 		if (ipv6_addr_equal(&ifp->addr, addr)) {
1752 			if (!dev || ifp->idev->dev == dev ||
1753 			    !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1754 				result = ifp;
1755 				in6_ifa_hold(ifp);
1756 				break;
1757 			}
1758 		}
1759 	}
1760 	rcu_read_unlock_bh();
1761 
1762 	return result;
1763 }
1764 
1765 /* Gets referenced address, destroys ifaddr */
1766 
1767 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1768 {
1769 	if (ifp->flags&IFA_F_PERMANENT) {
1770 		spin_lock_bh(&ifp->lock);
1771 		addrconf_del_dad_work(ifp);
1772 		ifp->flags |= IFA_F_TENTATIVE;
1773 		if (dad_failed)
1774 			ifp->flags |= IFA_F_DADFAILED;
1775 		spin_unlock_bh(&ifp->lock);
1776 		if (dad_failed)
1777 			ipv6_ifa_notify(0, ifp);
1778 		in6_ifa_put(ifp);
1779 	} else if (ifp->flags&IFA_F_TEMPORARY) {
1780 		struct inet6_ifaddr *ifpub;
1781 		spin_lock_bh(&ifp->lock);
1782 		ifpub = ifp->ifpub;
1783 		if (ifpub) {
1784 			in6_ifa_hold(ifpub);
1785 			spin_unlock_bh(&ifp->lock);
1786 			ipv6_create_tempaddr(ifpub, ifp);
1787 			in6_ifa_put(ifpub);
1788 		} else {
1789 			spin_unlock_bh(&ifp->lock);
1790 		}
1791 		ipv6_del_addr(ifp);
1792 	} else {
1793 		ipv6_del_addr(ifp);
1794 	}
1795 }
1796 
1797 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1798 {
1799 	int err = -ENOENT;
1800 
1801 	spin_lock_bh(&ifp->lock);
1802 	if (ifp->state == INET6_IFADDR_STATE_DAD) {
1803 		ifp->state = INET6_IFADDR_STATE_POSTDAD;
1804 		err = 0;
1805 	}
1806 	spin_unlock_bh(&ifp->lock);
1807 
1808 	return err;
1809 }
1810 
1811 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1812 {
1813 	struct in6_addr addr;
1814 	struct inet6_dev *idev = ifp->idev;
1815 	struct net *net = dev_net(ifp->idev->dev);
1816 
1817 	if (addrconf_dad_end(ifp)) {
1818 		in6_ifa_put(ifp);
1819 		return;
1820 	}
1821 
1822 	net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1823 			     ifp->idev->dev->name, &ifp->addr);
1824 
1825 	spin_lock_bh(&ifp->lock);
1826 
1827 	if (ifp->flags & IFA_F_STABLE_PRIVACY) {
1828 		int scope = ifp->scope;
1829 		u32 flags = ifp->flags;
1830 		struct in6_addr new_addr;
1831 		struct inet6_ifaddr *ifp2;
1832 		u32 valid_lft, preferred_lft;
1833 		int pfxlen = ifp->prefix_len;
1834 		int retries = ifp->stable_privacy_retry + 1;
1835 
1836 		if (retries > net->ipv6.sysctl.idgen_retries) {
1837 			net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
1838 					     ifp->idev->dev->name);
1839 			goto errdad;
1840 		}
1841 
1842 		new_addr = ifp->addr;
1843 		if (ipv6_generate_stable_address(&new_addr, retries,
1844 						 idev))
1845 			goto errdad;
1846 
1847 		valid_lft = ifp->valid_lft;
1848 		preferred_lft = ifp->prefered_lft;
1849 
1850 		spin_unlock_bh(&ifp->lock);
1851 
1852 		if (idev->cnf.max_addresses &&
1853 		    ipv6_count_addresses(idev) >=
1854 		    idev->cnf.max_addresses)
1855 			goto lock_errdad;
1856 
1857 		net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
1858 				     ifp->idev->dev->name);
1859 
1860 		ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen,
1861 				     scope, flags, valid_lft,
1862 				     preferred_lft);
1863 		if (IS_ERR(ifp2))
1864 			goto lock_errdad;
1865 
1866 		spin_lock_bh(&ifp2->lock);
1867 		ifp2->stable_privacy_retry = retries;
1868 		ifp2->state = INET6_IFADDR_STATE_PREDAD;
1869 		spin_unlock_bh(&ifp2->lock);
1870 
1871 		addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
1872 		in6_ifa_put(ifp2);
1873 lock_errdad:
1874 		spin_lock_bh(&ifp->lock);
1875 	} else if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1876 		addr.s6_addr32[0] = htonl(0xfe800000);
1877 		addr.s6_addr32[1] = 0;
1878 
1879 		if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1880 		    ipv6_addr_equal(&ifp->addr, &addr)) {
1881 			/* DAD failed for link-local based on MAC address */
1882 			idev->cnf.disable_ipv6 = 1;
1883 
1884 			pr_info("%s: IPv6 being disabled!\n",
1885 				ifp->idev->dev->name);
1886 		}
1887 	}
1888 
1889 errdad:
1890 	/* transition from _POSTDAD to _ERRDAD */
1891 	ifp->state = INET6_IFADDR_STATE_ERRDAD;
1892 	spin_unlock_bh(&ifp->lock);
1893 
1894 	addrconf_mod_dad_work(ifp, 0);
1895 }
1896 
1897 /* Join to solicited addr multicast group.
1898  * caller must hold RTNL */
1899 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1900 {
1901 	struct in6_addr maddr;
1902 
1903 	if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1904 		return;
1905 
1906 	addrconf_addr_solict_mult(addr, &maddr);
1907 	ipv6_dev_mc_inc(dev, &maddr);
1908 }
1909 
1910 /* caller must hold RTNL */
1911 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1912 {
1913 	struct in6_addr maddr;
1914 
1915 	if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1916 		return;
1917 
1918 	addrconf_addr_solict_mult(addr, &maddr);
1919 	__ipv6_dev_mc_dec(idev, &maddr);
1920 }
1921 
1922 /* caller must hold RTNL */
1923 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1924 {
1925 	struct in6_addr addr;
1926 
1927 	if (ifp->prefix_len >= 127) /* RFC 6164 */
1928 		return;
1929 	ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1930 	if (ipv6_addr_any(&addr))
1931 		return;
1932 	__ipv6_dev_ac_inc(ifp->idev, &addr);
1933 }
1934 
1935 /* caller must hold RTNL */
1936 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1937 {
1938 	struct in6_addr addr;
1939 
1940 	if (ifp->prefix_len >= 127) /* RFC 6164 */
1941 		return;
1942 	ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1943 	if (ipv6_addr_any(&addr))
1944 		return;
1945 	__ipv6_dev_ac_dec(ifp->idev, &addr);
1946 }
1947 
1948 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1949 {
1950 	if (dev->addr_len != EUI64_ADDR_LEN)
1951 		return -1;
1952 	memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
1953 	eui[0] ^= 2;
1954 	return 0;
1955 }
1956 
1957 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
1958 {
1959 	union fwnet_hwaddr *ha;
1960 
1961 	if (dev->addr_len != FWNET_ALEN)
1962 		return -1;
1963 
1964 	ha = (union fwnet_hwaddr *)dev->dev_addr;
1965 
1966 	memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
1967 	eui[0] ^= 2;
1968 	return 0;
1969 }
1970 
1971 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1972 {
1973 	/* XXX: inherit EUI-64 from other interface -- yoshfuji */
1974 	if (dev->addr_len != ARCNET_ALEN)
1975 		return -1;
1976 	memset(eui, 0, 7);
1977 	eui[7] = *(u8 *)dev->dev_addr;
1978 	return 0;
1979 }
1980 
1981 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1982 {
1983 	if (dev->addr_len != INFINIBAND_ALEN)
1984 		return -1;
1985 	memcpy(eui, dev->dev_addr + 12, 8);
1986 	eui[0] |= 2;
1987 	return 0;
1988 }
1989 
1990 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1991 {
1992 	if (addr == 0)
1993 		return -1;
1994 	eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1995 		  ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1996 		  ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1997 		  ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1998 		  ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1999 		  ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2000 	eui[1] = 0;
2001 	eui[2] = 0x5E;
2002 	eui[3] = 0xFE;
2003 	memcpy(eui + 4, &addr, 4);
2004 	return 0;
2005 }
2006 
2007 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2008 {
2009 	if (dev->priv_flags & IFF_ISATAP)
2010 		return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2011 	return -1;
2012 }
2013 
2014 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2015 {
2016 	return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2017 }
2018 
2019 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2020 {
2021 	memcpy(eui, dev->perm_addr, 3);
2022 	memcpy(eui + 5, dev->perm_addr + 3, 3);
2023 	eui[3] = 0xFF;
2024 	eui[4] = 0xFE;
2025 	eui[0] ^= 2;
2026 	return 0;
2027 }
2028 
2029 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2030 {
2031 	switch (dev->type) {
2032 	case ARPHRD_ETHER:
2033 	case ARPHRD_FDDI:
2034 		return addrconf_ifid_eui48(eui, dev);
2035 	case ARPHRD_ARCNET:
2036 		return addrconf_ifid_arcnet(eui, dev);
2037 	case ARPHRD_INFINIBAND:
2038 		return addrconf_ifid_infiniband(eui, dev);
2039 	case ARPHRD_SIT:
2040 		return addrconf_ifid_sit(eui, dev);
2041 	case ARPHRD_IPGRE:
2042 		return addrconf_ifid_gre(eui, dev);
2043 	case ARPHRD_6LOWPAN:
2044 		return addrconf_ifid_eui64(eui, dev);
2045 	case ARPHRD_IEEE1394:
2046 		return addrconf_ifid_ieee1394(eui, dev);
2047 	case ARPHRD_TUNNEL6:
2048 		return addrconf_ifid_ip6tnl(eui, dev);
2049 	}
2050 	return -1;
2051 }
2052 
2053 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2054 {
2055 	int err = -1;
2056 	struct inet6_ifaddr *ifp;
2057 
2058 	read_lock_bh(&idev->lock);
2059 	list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2060 		if (ifp->scope > IFA_LINK)
2061 			break;
2062 		if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2063 			memcpy(eui, ifp->addr.s6_addr+8, 8);
2064 			err = 0;
2065 			break;
2066 		}
2067 	}
2068 	read_unlock_bh(&idev->lock);
2069 	return err;
2070 }
2071 
2072 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
2073 static void __ipv6_regen_rndid(struct inet6_dev *idev)
2074 {
2075 regen:
2076 	get_random_bytes(idev->rndid, sizeof(idev->rndid));
2077 	idev->rndid[0] &= ~0x02;
2078 
2079 	/*
2080 	 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
2081 	 * check if generated address is not inappropriate
2082 	 *
2083 	 *  - Reserved subnet anycast (RFC 2526)
2084 	 *	11111101 11....11 1xxxxxxx
2085 	 *  - ISATAP (RFC4214) 6.1
2086 	 *	00-00-5E-FE-xx-xx-xx-xx
2087 	 *  - value 0
2088 	 *  - XXX: already assigned to an address on the device
2089 	 */
2090 	if (idev->rndid[0] == 0xfd &&
2091 	    (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
2092 	    (idev->rndid[7]&0x80))
2093 		goto regen;
2094 	if ((idev->rndid[0]|idev->rndid[1]) == 0) {
2095 		if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
2096 			goto regen;
2097 		if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
2098 			goto regen;
2099 	}
2100 }
2101 
2102 static void ipv6_regen_rndid(unsigned long data)
2103 {
2104 	struct inet6_dev *idev = (struct inet6_dev *) data;
2105 	unsigned long expires;
2106 
2107 	rcu_read_lock_bh();
2108 	write_lock_bh(&idev->lock);
2109 
2110 	if (idev->dead)
2111 		goto out;
2112 
2113 	__ipv6_regen_rndid(idev);
2114 
2115 	expires = jiffies +
2116 		idev->cnf.temp_prefered_lft * HZ -
2117 		idev->cnf.regen_max_retry * idev->cnf.dad_transmits *
2118 		NEIGH_VAR(idev->nd_parms, RETRANS_TIME) -
2119 		idev->cnf.max_desync_factor * HZ;
2120 	if (time_before(expires, jiffies)) {
2121 		pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
2122 			__func__, idev->dev->name);
2123 		goto out;
2124 	}
2125 
2126 	if (!mod_timer(&idev->regen_timer, expires))
2127 		in6_dev_hold(idev);
2128 
2129 out:
2130 	write_unlock_bh(&idev->lock);
2131 	rcu_read_unlock_bh();
2132 	in6_dev_put(idev);
2133 }
2134 
2135 static void  __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
2136 {
2137 	if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
2138 		__ipv6_regen_rndid(idev);
2139 }
2140 
2141 /*
2142  *	Add prefix route.
2143  */
2144 
2145 static void
2146 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
2147 		      unsigned long expires, u32 flags)
2148 {
2149 	struct fib6_config cfg = {
2150 		.fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
2151 		.fc_metric = IP6_RT_PRIO_ADDRCONF,
2152 		.fc_ifindex = dev->ifindex,
2153 		.fc_expires = expires,
2154 		.fc_dst_len = plen,
2155 		.fc_flags = RTF_UP | flags,
2156 		.fc_nlinfo.nl_net = dev_net(dev),
2157 		.fc_protocol = RTPROT_KERNEL,
2158 	};
2159 
2160 	cfg.fc_dst = *pfx;
2161 
2162 	/* Prevent useless cloning on PtP SIT.
2163 	   This thing is done here expecting that the whole
2164 	   class of non-broadcast devices need not cloning.
2165 	 */
2166 #if IS_ENABLED(CONFIG_IPV6_SIT)
2167 	if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2168 		cfg.fc_flags |= RTF_NONEXTHOP;
2169 #endif
2170 
2171 	ip6_route_add(&cfg);
2172 }
2173 
2174 
2175 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2176 						  int plen,
2177 						  const struct net_device *dev,
2178 						  u32 flags, u32 noflags)
2179 {
2180 	struct fib6_node *fn;
2181 	struct rt6_info *rt = NULL;
2182 	struct fib6_table *table;
2183 	u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
2184 
2185 	table = fib6_get_table(dev_net(dev), tb_id);
2186 	if (!table)
2187 		return NULL;
2188 
2189 	read_lock_bh(&table->tb6_lock);
2190 	fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
2191 	if (!fn)
2192 		goto out;
2193 
2194 	noflags |= RTF_CACHE;
2195 	for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
2196 		if (rt->dst.dev->ifindex != dev->ifindex)
2197 			continue;
2198 		if ((rt->rt6i_flags & flags) != flags)
2199 			continue;
2200 		if ((rt->rt6i_flags & noflags) != 0)
2201 			continue;
2202 		dst_hold(&rt->dst);
2203 		break;
2204 	}
2205 out:
2206 	read_unlock_bh(&table->tb6_lock);
2207 	return rt;
2208 }
2209 
2210 
2211 /* Create "default" multicast route to the interface */
2212 
2213 static void addrconf_add_mroute(struct net_device *dev)
2214 {
2215 	struct fib6_config cfg = {
2216 		.fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
2217 		.fc_metric = IP6_RT_PRIO_ADDRCONF,
2218 		.fc_ifindex = dev->ifindex,
2219 		.fc_dst_len = 8,
2220 		.fc_flags = RTF_UP,
2221 		.fc_nlinfo.nl_net = dev_net(dev),
2222 	};
2223 
2224 	ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2225 
2226 	ip6_route_add(&cfg);
2227 }
2228 
2229 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2230 {
2231 	struct inet6_dev *idev;
2232 
2233 	ASSERT_RTNL();
2234 
2235 	idev = ipv6_find_idev(dev);
2236 	if (!idev)
2237 		return ERR_PTR(-ENOBUFS);
2238 
2239 	if (idev->cnf.disable_ipv6)
2240 		return ERR_PTR(-EACCES);
2241 
2242 	/* Add default multicast route */
2243 	if (!(dev->flags & IFF_LOOPBACK))
2244 		addrconf_add_mroute(dev);
2245 
2246 	return idev;
2247 }
2248 
2249 static void manage_tempaddrs(struct inet6_dev *idev,
2250 			     struct inet6_ifaddr *ifp,
2251 			     __u32 valid_lft, __u32 prefered_lft,
2252 			     bool create, unsigned long now)
2253 {
2254 	u32 flags;
2255 	struct inet6_ifaddr *ift;
2256 
2257 	read_lock_bh(&idev->lock);
2258 	/* update all temporary addresses in the list */
2259 	list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2260 		int age, max_valid, max_prefered;
2261 
2262 		if (ifp != ift->ifpub)
2263 			continue;
2264 
2265 		/* RFC 4941 section 3.3:
2266 		 * If a received option will extend the lifetime of a public
2267 		 * address, the lifetimes of temporary addresses should
2268 		 * be extended, subject to the overall constraint that no
2269 		 * temporary addresses should ever remain "valid" or "preferred"
2270 		 * for a time longer than (TEMP_VALID_LIFETIME) or
2271 		 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2272 		 */
2273 		age = (now - ift->cstamp) / HZ;
2274 		max_valid = idev->cnf.temp_valid_lft - age;
2275 		if (max_valid < 0)
2276 			max_valid = 0;
2277 
2278 		max_prefered = idev->cnf.temp_prefered_lft -
2279 			       idev->cnf.max_desync_factor - age;
2280 		if (max_prefered < 0)
2281 			max_prefered = 0;
2282 
2283 		if (valid_lft > max_valid)
2284 			valid_lft = max_valid;
2285 
2286 		if (prefered_lft > max_prefered)
2287 			prefered_lft = max_prefered;
2288 
2289 		spin_lock(&ift->lock);
2290 		flags = ift->flags;
2291 		ift->valid_lft = valid_lft;
2292 		ift->prefered_lft = prefered_lft;
2293 		ift->tstamp = now;
2294 		if (prefered_lft > 0)
2295 			ift->flags &= ~IFA_F_DEPRECATED;
2296 
2297 		spin_unlock(&ift->lock);
2298 		if (!(flags&IFA_F_TENTATIVE))
2299 			ipv6_ifa_notify(0, ift);
2300 	}
2301 
2302 	if ((create || list_empty(&idev->tempaddr_list)) &&
2303 	    idev->cnf.use_tempaddr > 0) {
2304 		/* When a new public address is created as described
2305 		 * in [ADDRCONF], also create a new temporary address.
2306 		 * Also create a temporary address if it's enabled but
2307 		 * no temporary address currently exists.
2308 		 */
2309 		read_unlock_bh(&idev->lock);
2310 		ipv6_create_tempaddr(ifp, NULL);
2311 	} else {
2312 		read_unlock_bh(&idev->lock);
2313 	}
2314 }
2315 
2316 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2317 {
2318 	struct prefix_info *pinfo;
2319 	__u32 valid_lft;
2320 	__u32 prefered_lft;
2321 	int addr_type;
2322 	u32 addr_flags = 0;
2323 	struct inet6_dev *in6_dev;
2324 	struct net *net = dev_net(dev);
2325 
2326 	pinfo = (struct prefix_info *) opt;
2327 
2328 	if (len < sizeof(struct prefix_info)) {
2329 		ADBG("addrconf: prefix option too short\n");
2330 		return;
2331 	}
2332 
2333 	/*
2334 	 *	Validation checks ([ADDRCONF], page 19)
2335 	 */
2336 
2337 	addr_type = ipv6_addr_type(&pinfo->prefix);
2338 
2339 	if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2340 		return;
2341 
2342 	valid_lft = ntohl(pinfo->valid);
2343 	prefered_lft = ntohl(pinfo->prefered);
2344 
2345 	if (prefered_lft > valid_lft) {
2346 		net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2347 		return;
2348 	}
2349 
2350 	in6_dev = in6_dev_get(dev);
2351 
2352 	if (!in6_dev) {
2353 		net_dbg_ratelimited("addrconf: device %s not configured\n",
2354 				    dev->name);
2355 		return;
2356 	}
2357 
2358 	/*
2359 	 *	Two things going on here:
2360 	 *	1) Add routes for on-link prefixes
2361 	 *	2) Configure prefixes with the auto flag set
2362 	 */
2363 
2364 	if (pinfo->onlink) {
2365 		struct rt6_info *rt;
2366 		unsigned long rt_expires;
2367 
2368 		/* Avoid arithmetic overflow. Really, we could
2369 		 * save rt_expires in seconds, likely valid_lft,
2370 		 * but it would require division in fib gc, that it
2371 		 * not good.
2372 		 */
2373 		if (HZ > USER_HZ)
2374 			rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2375 		else
2376 			rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2377 
2378 		if (addrconf_finite_timeout(rt_expires))
2379 			rt_expires *= HZ;
2380 
2381 		rt = addrconf_get_prefix_route(&pinfo->prefix,
2382 					       pinfo->prefix_len,
2383 					       dev,
2384 					       RTF_ADDRCONF | RTF_PREFIX_RT,
2385 					       RTF_GATEWAY | RTF_DEFAULT);
2386 
2387 		if (rt) {
2388 			/* Autoconf prefix route */
2389 			if (valid_lft == 0) {
2390 				ip6_del_rt(rt);
2391 				rt = NULL;
2392 			} else if (addrconf_finite_timeout(rt_expires)) {
2393 				/* not infinity */
2394 				rt6_set_expires(rt, jiffies + rt_expires);
2395 			} else {
2396 				rt6_clean_expires(rt);
2397 			}
2398 		} else if (valid_lft) {
2399 			clock_t expires = 0;
2400 			int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2401 			if (addrconf_finite_timeout(rt_expires)) {
2402 				/* not infinity */
2403 				flags |= RTF_EXPIRES;
2404 				expires = jiffies_to_clock_t(rt_expires);
2405 			}
2406 			addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2407 					      dev, expires, flags);
2408 		}
2409 		ip6_rt_put(rt);
2410 	}
2411 
2412 	/* Try to figure out our local address for this prefix */
2413 
2414 	if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2415 		struct inet6_ifaddr *ifp;
2416 		struct in6_addr addr;
2417 		int create = 0, update_lft = 0;
2418 		bool tokenized = false;
2419 
2420 		if (pinfo->prefix_len == 64) {
2421 			memcpy(&addr, &pinfo->prefix, 8);
2422 
2423 			if (!ipv6_addr_any(&in6_dev->token)) {
2424 				read_lock_bh(&in6_dev->lock);
2425 				memcpy(addr.s6_addr + 8,
2426 				       in6_dev->token.s6_addr + 8, 8);
2427 				read_unlock_bh(&in6_dev->lock);
2428 				tokenized = true;
2429 			} else if (in6_dev->addr_gen_mode ==
2430 				   IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
2431 				   !ipv6_generate_stable_address(&addr, 0,
2432 								 in6_dev)) {
2433 				addr_flags |= IFA_F_STABLE_PRIVACY;
2434 				goto ok;
2435 			} else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2436 				   ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2437 				in6_dev_put(in6_dev);
2438 				return;
2439 			}
2440 			goto ok;
2441 		}
2442 		net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2443 				    pinfo->prefix_len);
2444 		in6_dev_put(in6_dev);
2445 		return;
2446 
2447 ok:
2448 
2449 		ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
2450 
2451 		if (!ifp && valid_lft) {
2452 			int max_addresses = in6_dev->cnf.max_addresses;
2453 
2454 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2455 			if (in6_dev->cnf.optimistic_dad &&
2456 			    !net->ipv6.devconf_all->forwarding && sllao)
2457 				addr_flags = IFA_F_OPTIMISTIC;
2458 #endif
2459 
2460 			/* Do not allow to create too much of autoconfigured
2461 			 * addresses; this would be too easy way to crash kernel.
2462 			 */
2463 			if (!max_addresses ||
2464 			    ipv6_count_addresses(in6_dev) < max_addresses)
2465 				ifp = ipv6_add_addr(in6_dev, &addr, NULL,
2466 						    pinfo->prefix_len,
2467 						    addr_type&IPV6_ADDR_SCOPE_MASK,
2468 						    addr_flags, valid_lft,
2469 						    prefered_lft);
2470 
2471 			if (IS_ERR_OR_NULL(ifp)) {
2472 				in6_dev_put(in6_dev);
2473 				return;
2474 			}
2475 
2476 			update_lft = 0;
2477 			create = 1;
2478 			spin_lock_bh(&ifp->lock);
2479 			ifp->flags |= IFA_F_MANAGETEMPADDR;
2480 			ifp->cstamp = jiffies;
2481 			ifp->tokenized = tokenized;
2482 			spin_unlock_bh(&ifp->lock);
2483 			addrconf_dad_start(ifp);
2484 		}
2485 
2486 		if (ifp) {
2487 			u32 flags;
2488 			unsigned long now;
2489 			u32 stored_lft;
2490 
2491 			/* update lifetime (RFC2462 5.5.3 e) */
2492 			spin_lock_bh(&ifp->lock);
2493 			now = jiffies;
2494 			if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2495 				stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2496 			else
2497 				stored_lft = 0;
2498 			if (!update_lft && !create && stored_lft) {
2499 				const u32 minimum_lft = min_t(u32,
2500 					stored_lft, MIN_VALID_LIFETIME);
2501 				valid_lft = max(valid_lft, minimum_lft);
2502 
2503 				/* RFC4862 Section 5.5.3e:
2504 				 * "Note that the preferred lifetime of the
2505 				 *  corresponding address is always reset to
2506 				 *  the Preferred Lifetime in the received
2507 				 *  Prefix Information option, regardless of
2508 				 *  whether the valid lifetime is also reset or
2509 				 *  ignored."
2510 				 *
2511 				 * So we should always update prefered_lft here.
2512 				 */
2513 				update_lft = 1;
2514 			}
2515 
2516 			if (update_lft) {
2517 				ifp->valid_lft = valid_lft;
2518 				ifp->prefered_lft = prefered_lft;
2519 				ifp->tstamp = now;
2520 				flags = ifp->flags;
2521 				ifp->flags &= ~IFA_F_DEPRECATED;
2522 				spin_unlock_bh(&ifp->lock);
2523 
2524 				if (!(flags&IFA_F_TENTATIVE))
2525 					ipv6_ifa_notify(0, ifp);
2526 			} else
2527 				spin_unlock_bh(&ifp->lock);
2528 
2529 			manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2530 					 create, now);
2531 
2532 			in6_ifa_put(ifp);
2533 			addrconf_verify();
2534 		}
2535 	}
2536 	inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2537 	in6_dev_put(in6_dev);
2538 }
2539 
2540 /*
2541  *	Set destination address.
2542  *	Special case for SIT interfaces where we create a new "virtual"
2543  *	device.
2544  */
2545 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2546 {
2547 	struct in6_ifreq ireq;
2548 	struct net_device *dev;
2549 	int err = -EINVAL;
2550 
2551 	rtnl_lock();
2552 
2553 	err = -EFAULT;
2554 	if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2555 		goto err_exit;
2556 
2557 	dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2558 
2559 	err = -ENODEV;
2560 	if (!dev)
2561 		goto err_exit;
2562 
2563 #if IS_ENABLED(CONFIG_IPV6_SIT)
2564 	if (dev->type == ARPHRD_SIT) {
2565 		const struct net_device_ops *ops = dev->netdev_ops;
2566 		struct ifreq ifr;
2567 		struct ip_tunnel_parm p;
2568 
2569 		err = -EADDRNOTAVAIL;
2570 		if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2571 			goto err_exit;
2572 
2573 		memset(&p, 0, sizeof(p));
2574 		p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2575 		p.iph.saddr = 0;
2576 		p.iph.version = 4;
2577 		p.iph.ihl = 5;
2578 		p.iph.protocol = IPPROTO_IPV6;
2579 		p.iph.ttl = 64;
2580 		ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2581 
2582 		if (ops->ndo_do_ioctl) {
2583 			mm_segment_t oldfs = get_fs();
2584 
2585 			set_fs(KERNEL_DS);
2586 			err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2587 			set_fs(oldfs);
2588 		} else
2589 			err = -EOPNOTSUPP;
2590 
2591 		if (err == 0) {
2592 			err = -ENOBUFS;
2593 			dev = __dev_get_by_name(net, p.name);
2594 			if (!dev)
2595 				goto err_exit;
2596 			err = dev_open(dev);
2597 		}
2598 	}
2599 #endif
2600 
2601 err_exit:
2602 	rtnl_unlock();
2603 	return err;
2604 }
2605 
2606 static int ipv6_mc_config(struct sock *sk, bool join,
2607 			  const struct in6_addr *addr, int ifindex)
2608 {
2609 	int ret;
2610 
2611 	ASSERT_RTNL();
2612 
2613 	lock_sock(sk);
2614 	if (join)
2615 		ret = ipv6_sock_mc_join(sk, ifindex, addr);
2616 	else
2617 		ret = ipv6_sock_mc_drop(sk, ifindex, addr);
2618 	release_sock(sk);
2619 
2620 	return ret;
2621 }
2622 
2623 /*
2624  *	Manual configuration of address on an interface
2625  */
2626 static int inet6_addr_add(struct net *net, int ifindex,
2627 			  const struct in6_addr *pfx,
2628 			  const struct in6_addr *peer_pfx,
2629 			  unsigned int plen, __u32 ifa_flags,
2630 			  __u32 prefered_lft, __u32 valid_lft)
2631 {
2632 	struct inet6_ifaddr *ifp;
2633 	struct inet6_dev *idev;
2634 	struct net_device *dev;
2635 	unsigned long timeout;
2636 	clock_t expires;
2637 	int scope;
2638 	u32 flags;
2639 
2640 	ASSERT_RTNL();
2641 
2642 	if (plen > 128)
2643 		return -EINVAL;
2644 
2645 	/* check the lifetime */
2646 	if (!valid_lft || prefered_lft > valid_lft)
2647 		return -EINVAL;
2648 
2649 	if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2650 		return -EINVAL;
2651 
2652 	dev = __dev_get_by_index(net, ifindex);
2653 	if (!dev)
2654 		return -ENODEV;
2655 
2656 	idev = addrconf_add_dev(dev);
2657 	if (IS_ERR(idev))
2658 		return PTR_ERR(idev);
2659 
2660 	if (ifa_flags & IFA_F_MCAUTOJOIN) {
2661 		int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2662 					 true, pfx, ifindex);
2663 
2664 		if (ret < 0)
2665 			return ret;
2666 	}
2667 
2668 	scope = ipv6_addr_scope(pfx);
2669 
2670 	timeout = addrconf_timeout_fixup(valid_lft, HZ);
2671 	if (addrconf_finite_timeout(timeout)) {
2672 		expires = jiffies_to_clock_t(timeout * HZ);
2673 		valid_lft = timeout;
2674 		flags = RTF_EXPIRES;
2675 	} else {
2676 		expires = 0;
2677 		flags = 0;
2678 		ifa_flags |= IFA_F_PERMANENT;
2679 	}
2680 
2681 	timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2682 	if (addrconf_finite_timeout(timeout)) {
2683 		if (timeout == 0)
2684 			ifa_flags |= IFA_F_DEPRECATED;
2685 		prefered_lft = timeout;
2686 	}
2687 
2688 	ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2689 			    valid_lft, prefered_lft);
2690 
2691 	if (!IS_ERR(ifp)) {
2692 		if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
2693 			addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2694 					      expires, flags);
2695 		}
2696 
2697 		/*
2698 		 * Note that section 3.1 of RFC 4429 indicates
2699 		 * that the Optimistic flag should not be set for
2700 		 * manually configured addresses
2701 		 */
2702 		addrconf_dad_start(ifp);
2703 		if (ifa_flags & IFA_F_MANAGETEMPADDR)
2704 			manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2705 					 true, jiffies);
2706 		in6_ifa_put(ifp);
2707 		addrconf_verify_rtnl();
2708 		return 0;
2709 	} else if (ifa_flags & IFA_F_MCAUTOJOIN) {
2710 		ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2711 			       false, pfx, ifindex);
2712 	}
2713 
2714 	return PTR_ERR(ifp);
2715 }
2716 
2717 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2718 			  const struct in6_addr *pfx, unsigned int plen)
2719 {
2720 	struct inet6_ifaddr *ifp;
2721 	struct inet6_dev *idev;
2722 	struct net_device *dev;
2723 
2724 	if (plen > 128)
2725 		return -EINVAL;
2726 
2727 	dev = __dev_get_by_index(net, ifindex);
2728 	if (!dev)
2729 		return -ENODEV;
2730 
2731 	idev = __in6_dev_get(dev);
2732 	if (!idev)
2733 		return -ENXIO;
2734 
2735 	read_lock_bh(&idev->lock);
2736 	list_for_each_entry(ifp, &idev->addr_list, if_list) {
2737 		if (ifp->prefix_len == plen &&
2738 		    ipv6_addr_equal(pfx, &ifp->addr)) {
2739 			in6_ifa_hold(ifp);
2740 			read_unlock_bh(&idev->lock);
2741 
2742 			if (!(ifp->flags & IFA_F_TEMPORARY) &&
2743 			    (ifa_flags & IFA_F_MANAGETEMPADDR))
2744 				manage_tempaddrs(idev, ifp, 0, 0, false,
2745 						 jiffies);
2746 			ipv6_del_addr(ifp);
2747 			addrconf_verify_rtnl();
2748 			if (ipv6_addr_is_multicast(pfx)) {
2749 				ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2750 					       false, pfx, dev->ifindex);
2751 			}
2752 			return 0;
2753 		}
2754 	}
2755 	read_unlock_bh(&idev->lock);
2756 	return -EADDRNOTAVAIL;
2757 }
2758 
2759 
2760 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2761 {
2762 	struct in6_ifreq ireq;
2763 	int err;
2764 
2765 	if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2766 		return -EPERM;
2767 
2768 	if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2769 		return -EFAULT;
2770 
2771 	rtnl_lock();
2772 	err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
2773 			     ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2774 			     INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2775 	rtnl_unlock();
2776 	return err;
2777 }
2778 
2779 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2780 {
2781 	struct in6_ifreq ireq;
2782 	int err;
2783 
2784 	if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2785 		return -EPERM;
2786 
2787 	if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2788 		return -EFAULT;
2789 
2790 	rtnl_lock();
2791 	err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
2792 			     ireq.ifr6_prefixlen);
2793 	rtnl_unlock();
2794 	return err;
2795 }
2796 
2797 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2798 		     int plen, int scope)
2799 {
2800 	struct inet6_ifaddr *ifp;
2801 
2802 	ifp = ipv6_add_addr(idev, addr, NULL, plen,
2803 			    scope, IFA_F_PERMANENT,
2804 			    INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2805 	if (!IS_ERR(ifp)) {
2806 		spin_lock_bh(&ifp->lock);
2807 		ifp->flags &= ~IFA_F_TENTATIVE;
2808 		spin_unlock_bh(&ifp->lock);
2809 		ipv6_ifa_notify(RTM_NEWADDR, ifp);
2810 		in6_ifa_put(ifp);
2811 	}
2812 }
2813 
2814 #if IS_ENABLED(CONFIG_IPV6_SIT)
2815 static void sit_add_v4_addrs(struct inet6_dev *idev)
2816 {
2817 	struct in6_addr addr;
2818 	struct net_device *dev;
2819 	struct net *net = dev_net(idev->dev);
2820 	int scope, plen;
2821 	u32 pflags = 0;
2822 
2823 	ASSERT_RTNL();
2824 
2825 	memset(&addr, 0, sizeof(struct in6_addr));
2826 	memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2827 
2828 	if (idev->dev->flags&IFF_POINTOPOINT) {
2829 		addr.s6_addr32[0] = htonl(0xfe800000);
2830 		scope = IFA_LINK;
2831 		plen = 64;
2832 	} else {
2833 		scope = IPV6_ADDR_COMPATv4;
2834 		plen = 96;
2835 		pflags |= RTF_NONEXTHOP;
2836 	}
2837 
2838 	if (addr.s6_addr32[3]) {
2839 		add_addr(idev, &addr, plen, scope);
2840 		addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
2841 		return;
2842 	}
2843 
2844 	for_each_netdev(net, dev) {
2845 		struct in_device *in_dev = __in_dev_get_rtnl(dev);
2846 		if (in_dev && (dev->flags & IFF_UP)) {
2847 			struct in_ifaddr *ifa;
2848 
2849 			int flag = scope;
2850 
2851 			for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2852 
2853 				addr.s6_addr32[3] = ifa->ifa_local;
2854 
2855 				if (ifa->ifa_scope == RT_SCOPE_LINK)
2856 					continue;
2857 				if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2858 					if (idev->dev->flags&IFF_POINTOPOINT)
2859 						continue;
2860 					flag |= IFA_HOST;
2861 				}
2862 
2863 				add_addr(idev, &addr, plen, flag);
2864 				addrconf_prefix_route(&addr, plen, idev->dev, 0,
2865 						      pflags);
2866 			}
2867 		}
2868 	}
2869 }
2870 #endif
2871 
2872 static void init_loopback(struct net_device *dev)
2873 {
2874 	struct inet6_dev  *idev;
2875 	struct net_device *sp_dev;
2876 	struct inet6_ifaddr *sp_ifa;
2877 	struct rt6_info *sp_rt;
2878 
2879 	/* ::1 */
2880 
2881 	ASSERT_RTNL();
2882 
2883 	idev = ipv6_find_idev(dev);
2884 	if (!idev) {
2885 		pr_debug("%s: add_dev failed\n", __func__);
2886 		return;
2887 	}
2888 
2889 	add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2890 
2891 	/* Add routes to other interface's IPv6 addresses */
2892 	for_each_netdev(dev_net(dev), sp_dev) {
2893 		if (!strcmp(sp_dev->name, dev->name))
2894 			continue;
2895 
2896 		idev = __in6_dev_get(sp_dev);
2897 		if (!idev)
2898 			continue;
2899 
2900 		read_lock_bh(&idev->lock);
2901 		list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
2902 
2903 			if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
2904 				continue;
2905 
2906 			if (sp_ifa->rt) {
2907 				/* This dst has been added to garbage list when
2908 				 * lo device down, release this obsolete dst and
2909 				 * reallocate a new router for ifa.
2910 				 */
2911 				if (sp_ifa->rt->dst.obsolete > 0) {
2912 					ip6_rt_put(sp_ifa->rt);
2913 					sp_ifa->rt = NULL;
2914 				} else {
2915 					continue;
2916 				}
2917 			}
2918 
2919 			sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false);
2920 
2921 			/* Failure cases are ignored */
2922 			if (!IS_ERR(sp_rt)) {
2923 				sp_ifa->rt = sp_rt;
2924 				ip6_ins_rt(sp_rt);
2925 			}
2926 		}
2927 		read_unlock_bh(&idev->lock);
2928 	}
2929 }
2930 
2931 static void addrconf_add_linklocal(struct inet6_dev *idev,
2932 				   const struct in6_addr *addr, u32 flags)
2933 {
2934 	struct inet6_ifaddr *ifp;
2935 	u32 addr_flags = flags | IFA_F_PERMANENT;
2936 
2937 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2938 	if (idev->cnf.optimistic_dad &&
2939 	    !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2940 		addr_flags |= IFA_F_OPTIMISTIC;
2941 #endif
2942 
2943 	ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
2944 			    INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2945 	if (!IS_ERR(ifp)) {
2946 		addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2947 		addrconf_dad_start(ifp);
2948 		in6_ifa_put(ifp);
2949 	}
2950 }
2951 
2952 static bool ipv6_reserved_interfaceid(struct in6_addr address)
2953 {
2954 	if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
2955 		return true;
2956 
2957 	if (address.s6_addr32[2] == htonl(0x02005eff) &&
2958 	    ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
2959 		return true;
2960 
2961 	if (address.s6_addr32[2] == htonl(0xfdffffff) &&
2962 	    ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
2963 		return true;
2964 
2965 	return false;
2966 }
2967 
2968 static int ipv6_generate_stable_address(struct in6_addr *address,
2969 					u8 dad_count,
2970 					const struct inet6_dev *idev)
2971 {
2972 	static DEFINE_SPINLOCK(lock);
2973 	static __u32 digest[SHA_DIGEST_WORDS];
2974 	static __u32 workspace[SHA_WORKSPACE_WORDS];
2975 
2976 	static union {
2977 		char __data[SHA_MESSAGE_BYTES];
2978 		struct {
2979 			struct in6_addr secret;
2980 			__be32 prefix[2];
2981 			unsigned char hwaddr[MAX_ADDR_LEN];
2982 			u8 dad_count;
2983 		} __packed;
2984 	} data;
2985 
2986 	struct in6_addr secret;
2987 	struct in6_addr temp;
2988 	struct net *net = dev_net(idev->dev);
2989 
2990 	BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
2991 
2992 	if (idev->cnf.stable_secret.initialized)
2993 		secret = idev->cnf.stable_secret.secret;
2994 	else if (net->ipv6.devconf_dflt->stable_secret.initialized)
2995 		secret = net->ipv6.devconf_dflt->stable_secret.secret;
2996 	else
2997 		return -1;
2998 
2999 retry:
3000 	spin_lock_bh(&lock);
3001 
3002 	sha_init(digest);
3003 	memset(&data, 0, sizeof(data));
3004 	memset(workspace, 0, sizeof(workspace));
3005 	memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
3006 	data.prefix[0] = address->s6_addr32[0];
3007 	data.prefix[1] = address->s6_addr32[1];
3008 	data.secret = secret;
3009 	data.dad_count = dad_count;
3010 
3011 	sha_transform(digest, data.__data, workspace);
3012 
3013 	temp = *address;
3014 	temp.s6_addr32[2] = (__force __be32)digest[0];
3015 	temp.s6_addr32[3] = (__force __be32)digest[1];
3016 
3017 	spin_unlock_bh(&lock);
3018 
3019 	if (ipv6_reserved_interfaceid(temp)) {
3020 		dad_count++;
3021 		if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
3022 			return -1;
3023 		goto retry;
3024 	}
3025 
3026 	*address = temp;
3027 	return 0;
3028 }
3029 
3030 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3031 {
3032 	struct in6_addr addr;
3033 
3034 	/* no link local addresses on L3 master devices */
3035 	if (netif_is_l3_master(idev->dev))
3036 		return;
3037 
3038 	ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
3039 
3040 	if (idev->addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY) {
3041 		if (!ipv6_generate_stable_address(&addr, 0, idev))
3042 			addrconf_add_linklocal(idev, &addr,
3043 					       IFA_F_STABLE_PRIVACY);
3044 		else if (prefix_route)
3045 			addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
3046 	} else if (idev->addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) {
3047 		/* addrconf_add_linklocal also adds a prefix_route and we
3048 		 * only need to care about prefix routes if ipv6_generate_eui64
3049 		 * couldn't generate one.
3050 		 */
3051 		if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
3052 			addrconf_add_linklocal(idev, &addr, 0);
3053 		else if (prefix_route)
3054 			addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
3055 	}
3056 }
3057 
3058 static void addrconf_dev_config(struct net_device *dev)
3059 {
3060 	struct inet6_dev *idev;
3061 
3062 	ASSERT_RTNL();
3063 
3064 	if ((dev->type != ARPHRD_ETHER) &&
3065 	    (dev->type != ARPHRD_FDDI) &&
3066 	    (dev->type != ARPHRD_ARCNET) &&
3067 	    (dev->type != ARPHRD_INFINIBAND) &&
3068 	    (dev->type != ARPHRD_IEEE1394) &&
3069 	    (dev->type != ARPHRD_TUNNEL6) &&
3070 	    (dev->type != ARPHRD_6LOWPAN)) {
3071 		/* Alas, we support only Ethernet autoconfiguration. */
3072 		return;
3073 	}
3074 
3075 	idev = addrconf_add_dev(dev);
3076 	if (IS_ERR(idev))
3077 		return;
3078 
3079 	addrconf_addr_gen(idev, false);
3080 }
3081 
3082 #if IS_ENABLED(CONFIG_IPV6_SIT)
3083 static void addrconf_sit_config(struct net_device *dev)
3084 {
3085 	struct inet6_dev *idev;
3086 
3087 	ASSERT_RTNL();
3088 
3089 	/*
3090 	 * Configure the tunnel with one of our IPv4
3091 	 * addresses... we should configure all of
3092 	 * our v4 addrs in the tunnel
3093 	 */
3094 
3095 	idev = ipv6_find_idev(dev);
3096 	if (!idev) {
3097 		pr_debug("%s: add_dev failed\n", __func__);
3098 		return;
3099 	}
3100 
3101 	if (dev->priv_flags & IFF_ISATAP) {
3102 		addrconf_addr_gen(idev, false);
3103 		return;
3104 	}
3105 
3106 	sit_add_v4_addrs(idev);
3107 
3108 	if (dev->flags&IFF_POINTOPOINT)
3109 		addrconf_add_mroute(dev);
3110 }
3111 #endif
3112 
3113 #if IS_ENABLED(CONFIG_NET_IPGRE)
3114 static void addrconf_gre_config(struct net_device *dev)
3115 {
3116 	struct inet6_dev *idev;
3117 
3118 	ASSERT_RTNL();
3119 
3120 	idev = ipv6_find_idev(dev);
3121 	if (!idev) {
3122 		pr_debug("%s: add_dev failed\n", __func__);
3123 		return;
3124 	}
3125 
3126 	addrconf_addr_gen(idev, true);
3127 	if (dev->flags & IFF_POINTOPOINT)
3128 		addrconf_add_mroute(dev);
3129 }
3130 #endif
3131 
3132 static int addrconf_notify(struct notifier_block *this, unsigned long event,
3133 			   void *ptr)
3134 {
3135 	struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3136 	struct inet6_dev *idev = __in6_dev_get(dev);
3137 	int run_pending = 0;
3138 	int err;
3139 
3140 	switch (event) {
3141 	case NETDEV_REGISTER:
3142 		if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3143 			idev = ipv6_add_dev(dev);
3144 			if (IS_ERR(idev))
3145 				return notifier_from_errno(PTR_ERR(idev));
3146 		}
3147 		break;
3148 
3149 	case NETDEV_CHANGEMTU:
3150 		/* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3151 		if (dev->mtu < IPV6_MIN_MTU) {
3152 			addrconf_ifdown(dev, 1);
3153 			break;
3154 		}
3155 
3156 		if (idev) {
3157 			rt6_mtu_change(dev, dev->mtu);
3158 			idev->cnf.mtu6 = dev->mtu;
3159 			break;
3160 		}
3161 
3162 		/* allocate new idev */
3163 		idev = ipv6_add_dev(dev);
3164 		if (IS_ERR(idev))
3165 			break;
3166 
3167 		/* device is still not ready */
3168 		if (!(idev->if_flags & IF_READY))
3169 			break;
3170 
3171 		run_pending = 1;
3172 
3173 		/* fall through */
3174 
3175 	case NETDEV_UP:
3176 	case NETDEV_CHANGE:
3177 		if (dev->flags & IFF_SLAVE)
3178 			break;
3179 
3180 		if (idev && idev->cnf.disable_ipv6)
3181 			break;
3182 
3183 		if (event == NETDEV_UP) {
3184 			if (!addrconf_qdisc_ok(dev)) {
3185 				/* device is not ready yet. */
3186 				pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3187 					dev->name);
3188 				break;
3189 			}
3190 
3191 			if (!idev && dev->mtu >= IPV6_MIN_MTU)
3192 				idev = ipv6_add_dev(dev);
3193 
3194 			if (!IS_ERR_OR_NULL(idev)) {
3195 				idev->if_flags |= IF_READY;
3196 				run_pending = 1;
3197 			}
3198 		} else if (event == NETDEV_CHANGE) {
3199 			if (!addrconf_qdisc_ok(dev)) {
3200 				/* device is still not ready. */
3201 				break;
3202 			}
3203 
3204 			if (idev) {
3205 				if (idev->if_flags & IF_READY)
3206 					/* device is already configured. */
3207 					break;
3208 				idev->if_flags |= IF_READY;
3209 			}
3210 
3211 			pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3212 				dev->name);
3213 
3214 			run_pending = 1;
3215 		}
3216 
3217 		switch (dev->type) {
3218 #if IS_ENABLED(CONFIG_IPV6_SIT)
3219 		case ARPHRD_SIT:
3220 			addrconf_sit_config(dev);
3221 			break;
3222 #endif
3223 #if IS_ENABLED(CONFIG_NET_IPGRE)
3224 		case ARPHRD_IPGRE:
3225 			addrconf_gre_config(dev);
3226 			break;
3227 #endif
3228 		case ARPHRD_LOOPBACK:
3229 			init_loopback(dev);
3230 			break;
3231 
3232 		default:
3233 			addrconf_dev_config(dev);
3234 			break;
3235 		}
3236 
3237 		if (!IS_ERR_OR_NULL(idev)) {
3238 			if (run_pending)
3239 				addrconf_dad_run(idev);
3240 
3241 			/*
3242 			 * If the MTU changed during the interface down,
3243 			 * when the interface up, the changed MTU must be
3244 			 * reflected in the idev as well as routers.
3245 			 */
3246 			if (idev->cnf.mtu6 != dev->mtu &&
3247 			    dev->mtu >= IPV6_MIN_MTU) {
3248 				rt6_mtu_change(dev, dev->mtu);
3249 				idev->cnf.mtu6 = dev->mtu;
3250 			}
3251 			idev->tstamp = jiffies;
3252 			inet6_ifinfo_notify(RTM_NEWLINK, idev);
3253 
3254 			/*
3255 			 * If the changed mtu during down is lower than
3256 			 * IPV6_MIN_MTU stop IPv6 on this interface.
3257 			 */
3258 			if (dev->mtu < IPV6_MIN_MTU)
3259 				addrconf_ifdown(dev, 1);
3260 		}
3261 		break;
3262 
3263 	case NETDEV_DOWN:
3264 	case NETDEV_UNREGISTER:
3265 		/*
3266 		 *	Remove all addresses from this interface.
3267 		 */
3268 		addrconf_ifdown(dev, event != NETDEV_DOWN);
3269 		break;
3270 
3271 	case NETDEV_CHANGENAME:
3272 		if (idev) {
3273 			snmp6_unregister_dev(idev);
3274 			addrconf_sysctl_unregister(idev);
3275 			err = addrconf_sysctl_register(idev);
3276 			if (err)
3277 				return notifier_from_errno(err);
3278 			err = snmp6_register_dev(idev);
3279 			if (err) {
3280 				addrconf_sysctl_unregister(idev);
3281 				return notifier_from_errno(err);
3282 			}
3283 		}
3284 		break;
3285 
3286 	case NETDEV_PRE_TYPE_CHANGE:
3287 	case NETDEV_POST_TYPE_CHANGE:
3288 		if (idev)
3289 			addrconf_type_change(dev, event);
3290 		break;
3291 	}
3292 
3293 	return NOTIFY_OK;
3294 }
3295 
3296 /*
3297  *	addrconf module should be notified of a device going up
3298  */
3299 static struct notifier_block ipv6_dev_notf = {
3300 	.notifier_call = addrconf_notify,
3301 };
3302 
3303 static void addrconf_type_change(struct net_device *dev, unsigned long event)
3304 {
3305 	struct inet6_dev *idev;
3306 	ASSERT_RTNL();
3307 
3308 	idev = __in6_dev_get(dev);
3309 
3310 	if (event == NETDEV_POST_TYPE_CHANGE)
3311 		ipv6_mc_remap(idev);
3312 	else if (event == NETDEV_PRE_TYPE_CHANGE)
3313 		ipv6_mc_unmap(idev);
3314 }
3315 
3316 static int addrconf_ifdown(struct net_device *dev, int how)
3317 {
3318 	struct net *net = dev_net(dev);
3319 	struct inet6_dev *idev;
3320 	struct inet6_ifaddr *ifa;
3321 	int state, i;
3322 
3323 	ASSERT_RTNL();
3324 
3325 	rt6_ifdown(net, dev);
3326 	neigh_ifdown(&nd_tbl, dev);
3327 
3328 	idev = __in6_dev_get(dev);
3329 	if (!idev)
3330 		return -ENODEV;
3331 
3332 	/*
3333 	 * Step 1: remove reference to ipv6 device from parent device.
3334 	 *	   Do not dev_put!
3335 	 */
3336 	if (how) {
3337 		idev->dead = 1;
3338 
3339 		/* protected by rtnl_lock */
3340 		RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3341 
3342 		/* Step 1.5: remove snmp6 entry */
3343 		snmp6_unregister_dev(idev);
3344 
3345 	}
3346 
3347 	/* Step 2: clear hash table */
3348 	for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3349 		struct hlist_head *h = &inet6_addr_lst[i];
3350 
3351 		spin_lock_bh(&addrconf_hash_lock);
3352 restart:
3353 		hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3354 			if (ifa->idev == idev) {
3355 				hlist_del_init_rcu(&ifa->addr_lst);
3356 				addrconf_del_dad_work(ifa);
3357 				goto restart;
3358 			}
3359 		}
3360 		spin_unlock_bh(&addrconf_hash_lock);
3361 	}
3362 
3363 	write_lock_bh(&idev->lock);
3364 
3365 	addrconf_del_rs_timer(idev);
3366 
3367 	/* Step 2: clear flags for stateless addrconf */
3368 	if (!how)
3369 		idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3370 
3371 	if (how && del_timer(&idev->regen_timer))
3372 		in6_dev_put(idev);
3373 
3374 	/* Step 3: clear tempaddr list */
3375 	while (!list_empty(&idev->tempaddr_list)) {
3376 		ifa = list_first_entry(&idev->tempaddr_list,
3377 				       struct inet6_ifaddr, tmp_list);
3378 		list_del(&ifa->tmp_list);
3379 		write_unlock_bh(&idev->lock);
3380 		spin_lock_bh(&ifa->lock);
3381 
3382 		if (ifa->ifpub) {
3383 			in6_ifa_put(ifa->ifpub);
3384 			ifa->ifpub = NULL;
3385 		}
3386 		spin_unlock_bh(&ifa->lock);
3387 		in6_ifa_put(ifa);
3388 		write_lock_bh(&idev->lock);
3389 	}
3390 
3391 	while (!list_empty(&idev->addr_list)) {
3392 		ifa = list_first_entry(&idev->addr_list,
3393 				       struct inet6_ifaddr, if_list);
3394 		addrconf_del_dad_work(ifa);
3395 
3396 		list_del(&ifa->if_list);
3397 
3398 		write_unlock_bh(&idev->lock);
3399 
3400 		spin_lock_bh(&ifa->lock);
3401 		state = ifa->state;
3402 		ifa->state = INET6_IFADDR_STATE_DEAD;
3403 		spin_unlock_bh(&ifa->lock);
3404 
3405 		if (state != INET6_IFADDR_STATE_DEAD) {
3406 			__ipv6_ifa_notify(RTM_DELADDR, ifa);
3407 			inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3408 		}
3409 		in6_ifa_put(ifa);
3410 
3411 		write_lock_bh(&idev->lock);
3412 	}
3413 
3414 	write_unlock_bh(&idev->lock);
3415 
3416 	/* Step 5: Discard anycast and multicast list */
3417 	if (how) {
3418 		ipv6_ac_destroy_dev(idev);
3419 		ipv6_mc_destroy_dev(idev);
3420 	} else {
3421 		ipv6_mc_down(idev);
3422 	}
3423 
3424 	idev->tstamp = jiffies;
3425 
3426 	/* Last: Shot the device (if unregistered) */
3427 	if (how) {
3428 		addrconf_sysctl_unregister(idev);
3429 		neigh_parms_release(&nd_tbl, idev->nd_parms);
3430 		neigh_ifdown(&nd_tbl, dev);
3431 		in6_dev_put(idev);
3432 	}
3433 	return 0;
3434 }
3435 
3436 static void addrconf_rs_timer(unsigned long data)
3437 {
3438 	struct inet6_dev *idev = (struct inet6_dev *)data;
3439 	struct net_device *dev = idev->dev;
3440 	struct in6_addr lladdr;
3441 
3442 	write_lock(&idev->lock);
3443 	if (idev->dead || !(idev->if_flags & IF_READY))
3444 		goto out;
3445 
3446 	if (!ipv6_accept_ra(idev))
3447 		goto out;
3448 
3449 	/* Announcement received after solicitation was sent */
3450 	if (idev->if_flags & IF_RA_RCVD)
3451 		goto out;
3452 
3453 	if (idev->rs_probes++ < idev->cnf.rtr_solicits) {
3454 		write_unlock(&idev->lock);
3455 		if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3456 			ndisc_send_rs(dev, &lladdr,
3457 				      &in6addr_linklocal_allrouters);
3458 		else
3459 			goto put;
3460 
3461 		write_lock(&idev->lock);
3462 		/* The wait after the last probe can be shorter */
3463 		addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3464 					     idev->cnf.rtr_solicits) ?
3465 				      idev->cnf.rtr_solicit_delay :
3466 				      idev->cnf.rtr_solicit_interval);
3467 	} else {
3468 		/*
3469 		 * Note: we do not support deprecated "all on-link"
3470 		 * assumption any longer.
3471 		 */
3472 		pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3473 	}
3474 
3475 out:
3476 	write_unlock(&idev->lock);
3477 put:
3478 	in6_dev_put(idev);
3479 }
3480 
3481 /*
3482  *	Duplicate Address Detection
3483  */
3484 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3485 {
3486 	unsigned long rand_num;
3487 	struct inet6_dev *idev = ifp->idev;
3488 
3489 	if (ifp->flags & IFA_F_OPTIMISTIC)
3490 		rand_num = 0;
3491 	else
3492 		rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
3493 
3494 	ifp->dad_probes = idev->cnf.dad_transmits;
3495 	addrconf_mod_dad_work(ifp, rand_num);
3496 }
3497 
3498 static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
3499 {
3500 	struct inet6_dev *idev = ifp->idev;
3501 	struct net_device *dev = idev->dev;
3502 
3503 	addrconf_join_solict(dev, &ifp->addr);
3504 
3505 	prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
3506 
3507 	read_lock_bh(&idev->lock);
3508 	spin_lock(&ifp->lock);
3509 	if (ifp->state == INET6_IFADDR_STATE_DEAD)
3510 		goto out;
3511 
3512 	if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3513 	    idev->cnf.accept_dad < 1 ||
3514 	    !(ifp->flags&IFA_F_TENTATIVE) ||
3515 	    ifp->flags & IFA_F_NODAD) {
3516 		ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3517 		spin_unlock(&ifp->lock);
3518 		read_unlock_bh(&idev->lock);
3519 
3520 		addrconf_dad_completed(ifp);
3521 		return;
3522 	}
3523 
3524 	if (!(idev->if_flags & IF_READY)) {
3525 		spin_unlock(&ifp->lock);
3526 		read_unlock_bh(&idev->lock);
3527 		/*
3528 		 * If the device is not ready:
3529 		 * - keep it tentative if it is a permanent address.
3530 		 * - otherwise, kill it.
3531 		 */
3532 		in6_ifa_hold(ifp);
3533 		addrconf_dad_stop(ifp, 0);
3534 		return;
3535 	}
3536 
3537 	/*
3538 	 * Optimistic nodes can start receiving
3539 	 * Frames right away
3540 	 */
3541 	if (ifp->flags & IFA_F_OPTIMISTIC) {
3542 		ip6_ins_rt(ifp->rt);
3543 		if (ipv6_use_optimistic_addr(idev)) {
3544 			/* Because optimistic nodes can use this address,
3545 			 * notify listeners. If DAD fails, RTM_DELADDR is sent.
3546 			 */
3547 			ipv6_ifa_notify(RTM_NEWADDR, ifp);
3548 		}
3549 	}
3550 
3551 	addrconf_dad_kick(ifp);
3552 out:
3553 	spin_unlock(&ifp->lock);
3554 	read_unlock_bh(&idev->lock);
3555 }
3556 
3557 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
3558 {
3559 	bool begin_dad = false;
3560 
3561 	spin_lock_bh(&ifp->lock);
3562 	if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3563 		ifp->state = INET6_IFADDR_STATE_PREDAD;
3564 		begin_dad = true;
3565 	}
3566 	spin_unlock_bh(&ifp->lock);
3567 
3568 	if (begin_dad)
3569 		addrconf_mod_dad_work(ifp, 0);
3570 }
3571 
3572 static void addrconf_dad_work(struct work_struct *w)
3573 {
3574 	struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3575 						struct inet6_ifaddr,
3576 						dad_work);
3577 	struct inet6_dev *idev = ifp->idev;
3578 	struct in6_addr mcaddr;
3579 
3580 	enum {
3581 		DAD_PROCESS,
3582 		DAD_BEGIN,
3583 		DAD_ABORT,
3584 	} action = DAD_PROCESS;
3585 
3586 	rtnl_lock();
3587 
3588 	spin_lock_bh(&ifp->lock);
3589 	if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3590 		action = DAD_BEGIN;
3591 		ifp->state = INET6_IFADDR_STATE_DAD;
3592 	} else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3593 		action = DAD_ABORT;
3594 		ifp->state = INET6_IFADDR_STATE_POSTDAD;
3595 	}
3596 	spin_unlock_bh(&ifp->lock);
3597 
3598 	if (action == DAD_BEGIN) {
3599 		addrconf_dad_begin(ifp);
3600 		goto out;
3601 	} else if (action == DAD_ABORT) {
3602 		addrconf_dad_stop(ifp, 1);
3603 		goto out;
3604 	}
3605 
3606 	if (!ifp->dad_probes && addrconf_dad_end(ifp))
3607 		goto out;
3608 
3609 	write_lock_bh(&idev->lock);
3610 	if (idev->dead || !(idev->if_flags & IF_READY)) {
3611 		write_unlock_bh(&idev->lock);
3612 		goto out;
3613 	}
3614 
3615 	spin_lock(&ifp->lock);
3616 	if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3617 		spin_unlock(&ifp->lock);
3618 		write_unlock_bh(&idev->lock);
3619 		goto out;
3620 	}
3621 
3622 	if (ifp->dad_probes == 0) {
3623 		/*
3624 		 * DAD was successful
3625 		 */
3626 
3627 		ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3628 		spin_unlock(&ifp->lock);
3629 		write_unlock_bh(&idev->lock);
3630 
3631 		addrconf_dad_completed(ifp);
3632 
3633 		goto out;
3634 	}
3635 
3636 	ifp->dad_probes--;
3637 	addrconf_mod_dad_work(ifp,
3638 			      NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
3639 	spin_unlock(&ifp->lock);
3640 	write_unlock_bh(&idev->lock);
3641 
3642 	/* send a neighbour solicitation for our addr */
3643 	addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3644 	ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any);
3645 out:
3646 	in6_ifa_put(ifp);
3647 	rtnl_unlock();
3648 }
3649 
3650 /* ifp->idev must be at least read locked */
3651 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
3652 {
3653 	struct inet6_ifaddr *ifpiter;
3654 	struct inet6_dev *idev = ifp->idev;
3655 
3656 	list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
3657 		if (ifpiter->scope > IFA_LINK)
3658 			break;
3659 		if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
3660 		    (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
3661 				       IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
3662 		    IFA_F_PERMANENT)
3663 			return false;
3664 	}
3665 	return true;
3666 }
3667 
3668 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3669 {
3670 	struct net_device *dev = ifp->idev->dev;
3671 	struct in6_addr lladdr;
3672 	bool send_rs, send_mld;
3673 
3674 	addrconf_del_dad_work(ifp);
3675 
3676 	/*
3677 	 *	Configure the address for reception. Now it is valid.
3678 	 */
3679 
3680 	ipv6_ifa_notify(RTM_NEWADDR, ifp);
3681 
3682 	/* If added prefix is link local and we are prepared to process
3683 	   router advertisements, start sending router solicitations.
3684 	 */
3685 
3686 	read_lock_bh(&ifp->idev->lock);
3687 	send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
3688 	send_rs = send_mld &&
3689 		  ipv6_accept_ra(ifp->idev) &&
3690 		  ifp->idev->cnf.rtr_solicits > 0 &&
3691 		  (dev->flags&IFF_LOOPBACK) == 0;
3692 	read_unlock_bh(&ifp->idev->lock);
3693 
3694 	/* While dad is in progress mld report's source address is in6_addrany.
3695 	 * Resend with proper ll now.
3696 	 */
3697 	if (send_mld)
3698 		ipv6_mc_dad_complete(ifp->idev);
3699 
3700 	if (send_rs) {
3701 		/*
3702 		 *	If a host as already performed a random delay
3703 		 *	[...] as part of DAD [...] there is no need
3704 		 *	to delay again before sending the first RS
3705 		 */
3706 		if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3707 			return;
3708 		ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
3709 
3710 		write_lock_bh(&ifp->idev->lock);
3711 		spin_lock(&ifp->lock);
3712 		ifp->idev->rs_probes = 1;
3713 		ifp->idev->if_flags |= IF_RS_SENT;
3714 		addrconf_mod_rs_timer(ifp->idev,
3715 				      ifp->idev->cnf.rtr_solicit_interval);
3716 		spin_unlock(&ifp->lock);
3717 		write_unlock_bh(&ifp->idev->lock);
3718 	}
3719 }
3720 
3721 static void addrconf_dad_run(struct inet6_dev *idev)
3722 {
3723 	struct inet6_ifaddr *ifp;
3724 
3725 	read_lock_bh(&idev->lock);
3726 	list_for_each_entry(ifp, &idev->addr_list, if_list) {
3727 		spin_lock(&ifp->lock);
3728 		if (ifp->flags & IFA_F_TENTATIVE &&
3729 		    ifp->state == INET6_IFADDR_STATE_DAD)
3730 			addrconf_dad_kick(ifp);
3731 		spin_unlock(&ifp->lock);
3732 	}
3733 	read_unlock_bh(&idev->lock);
3734 }
3735 
3736 #ifdef CONFIG_PROC_FS
3737 struct if6_iter_state {
3738 	struct seq_net_private p;
3739 	int bucket;
3740 	int offset;
3741 };
3742 
3743 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
3744 {
3745 	struct inet6_ifaddr *ifa = NULL;
3746 	struct if6_iter_state *state = seq->private;
3747 	struct net *net = seq_file_net(seq);
3748 	int p = 0;
3749 
3750 	/* initial bucket if pos is 0 */
3751 	if (pos == 0) {
3752 		state->bucket = 0;
3753 		state->offset = 0;
3754 	}
3755 
3756 	for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3757 		hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
3758 					 addr_lst) {
3759 			if (!net_eq(dev_net(ifa->idev->dev), net))
3760 				continue;
3761 			/* sync with offset */
3762 			if (p < state->offset) {
3763 				p++;
3764 				continue;
3765 			}
3766 			state->offset++;
3767 			return ifa;
3768 		}
3769 
3770 		/* prepare for next bucket */
3771 		state->offset = 0;
3772 		p = 0;
3773 	}
3774 	return NULL;
3775 }
3776 
3777 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3778 					 struct inet6_ifaddr *ifa)
3779 {
3780 	struct if6_iter_state *state = seq->private;
3781 	struct net *net = seq_file_net(seq);
3782 
3783 	hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
3784 		if (!net_eq(dev_net(ifa->idev->dev), net))
3785 			continue;
3786 		state->offset++;
3787 		return ifa;
3788 	}
3789 
3790 	while (++state->bucket < IN6_ADDR_HSIZE) {
3791 		state->offset = 0;
3792 		hlist_for_each_entry_rcu_bh(ifa,
3793 				     &inet6_addr_lst[state->bucket], addr_lst) {
3794 			if (!net_eq(dev_net(ifa->idev->dev), net))
3795 				continue;
3796 			state->offset++;
3797 			return ifa;
3798 		}
3799 	}
3800 
3801 	return NULL;
3802 }
3803 
3804 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3805 	__acquires(rcu_bh)
3806 {
3807 	rcu_read_lock_bh();
3808 	return if6_get_first(seq, *pos);
3809 }
3810 
3811 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3812 {
3813 	struct inet6_ifaddr *ifa;
3814 
3815 	ifa = if6_get_next(seq, v);
3816 	++*pos;
3817 	return ifa;
3818 }
3819 
3820 static void if6_seq_stop(struct seq_file *seq, void *v)
3821 	__releases(rcu_bh)
3822 {
3823 	rcu_read_unlock_bh();
3824 }
3825 
3826 static int if6_seq_show(struct seq_file *seq, void *v)
3827 {
3828 	struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3829 	seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3830 		   &ifp->addr,
3831 		   ifp->idev->dev->ifindex,
3832 		   ifp->prefix_len,
3833 		   ifp->scope,
3834 		   (u8) ifp->flags,
3835 		   ifp->idev->dev->name);
3836 	return 0;
3837 }
3838 
3839 static const struct seq_operations if6_seq_ops = {
3840 	.start	= if6_seq_start,
3841 	.next	= if6_seq_next,
3842 	.show	= if6_seq_show,
3843 	.stop	= if6_seq_stop,
3844 };
3845 
3846 static int if6_seq_open(struct inode *inode, struct file *file)
3847 {
3848 	return seq_open_net(inode, file, &if6_seq_ops,
3849 			    sizeof(struct if6_iter_state));
3850 }
3851 
3852 static const struct file_operations if6_fops = {
3853 	.owner		= THIS_MODULE,
3854 	.open		= if6_seq_open,
3855 	.read		= seq_read,
3856 	.llseek		= seq_lseek,
3857 	.release	= seq_release_net,
3858 };
3859 
3860 static int __net_init if6_proc_net_init(struct net *net)
3861 {
3862 	if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
3863 		return -ENOMEM;
3864 	return 0;
3865 }
3866 
3867 static void __net_exit if6_proc_net_exit(struct net *net)
3868 {
3869 	remove_proc_entry("if_inet6", net->proc_net);
3870 }
3871 
3872 static struct pernet_operations if6_proc_net_ops = {
3873 	.init = if6_proc_net_init,
3874 	.exit = if6_proc_net_exit,
3875 };
3876 
3877 int __init if6_proc_init(void)
3878 {
3879 	return register_pernet_subsys(&if6_proc_net_ops);
3880 }
3881 
3882 void if6_proc_exit(void)
3883 {
3884 	unregister_pernet_subsys(&if6_proc_net_ops);
3885 }
3886 #endif	/* CONFIG_PROC_FS */
3887 
3888 #if IS_ENABLED(CONFIG_IPV6_MIP6)
3889 /* Check if address is a home address configured on any interface. */
3890 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3891 {
3892 	int ret = 0;
3893 	struct inet6_ifaddr *ifp = NULL;
3894 	unsigned int hash = inet6_addr_hash(addr);
3895 
3896 	rcu_read_lock_bh();
3897 	hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
3898 		if (!net_eq(dev_net(ifp->idev->dev), net))
3899 			continue;
3900 		if (ipv6_addr_equal(&ifp->addr, addr) &&
3901 		    (ifp->flags & IFA_F_HOMEADDRESS)) {
3902 			ret = 1;
3903 			break;
3904 		}
3905 	}
3906 	rcu_read_unlock_bh();
3907 	return ret;
3908 }
3909 #endif
3910 
3911 /*
3912  *	Periodic address status verification
3913  */
3914 
3915 static void addrconf_verify_rtnl(void)
3916 {
3917 	unsigned long now, next, next_sec, next_sched;
3918 	struct inet6_ifaddr *ifp;
3919 	int i;
3920 
3921 	ASSERT_RTNL();
3922 
3923 	rcu_read_lock_bh();
3924 	now = jiffies;
3925 	next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3926 
3927 	cancel_delayed_work(&addr_chk_work);
3928 
3929 	for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3930 restart:
3931 		hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
3932 			unsigned long age;
3933 
3934 			/* When setting preferred_lft to a value not zero or
3935 			 * infinity, while valid_lft is infinity
3936 			 * IFA_F_PERMANENT has a non-infinity life time.
3937 			 */
3938 			if ((ifp->flags & IFA_F_PERMANENT) &&
3939 			    (ifp->prefered_lft == INFINITY_LIFE_TIME))
3940 				continue;
3941 
3942 			spin_lock(&ifp->lock);
3943 			/* We try to batch several events at once. */
3944 			age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3945 
3946 			if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3947 			    age >= ifp->valid_lft) {
3948 				spin_unlock(&ifp->lock);
3949 				in6_ifa_hold(ifp);
3950 				ipv6_del_addr(ifp);
3951 				goto restart;
3952 			} else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3953 				spin_unlock(&ifp->lock);
3954 				continue;
3955 			} else if (age >= ifp->prefered_lft) {
3956 				/* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3957 				int deprecate = 0;
3958 
3959 				if (!(ifp->flags&IFA_F_DEPRECATED)) {
3960 					deprecate = 1;
3961 					ifp->flags |= IFA_F_DEPRECATED;
3962 				}
3963 
3964 				if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
3965 				    (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
3966 					next = ifp->tstamp + ifp->valid_lft * HZ;
3967 
3968 				spin_unlock(&ifp->lock);
3969 
3970 				if (deprecate) {
3971 					in6_ifa_hold(ifp);
3972 
3973 					ipv6_ifa_notify(0, ifp);
3974 					in6_ifa_put(ifp);
3975 					goto restart;
3976 				}
3977 			} else if ((ifp->flags&IFA_F_TEMPORARY) &&
3978 				   !(ifp->flags&IFA_F_TENTATIVE)) {
3979 				unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3980 					ifp->idev->cnf.dad_transmits *
3981 					NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
3982 
3983 				if (age >= ifp->prefered_lft - regen_advance) {
3984 					struct inet6_ifaddr *ifpub = ifp->ifpub;
3985 					if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3986 						next = ifp->tstamp + ifp->prefered_lft * HZ;
3987 					if (!ifp->regen_count && ifpub) {
3988 						ifp->regen_count++;
3989 						in6_ifa_hold(ifp);
3990 						in6_ifa_hold(ifpub);
3991 						spin_unlock(&ifp->lock);
3992 
3993 						spin_lock(&ifpub->lock);
3994 						ifpub->regen_count = 0;
3995 						spin_unlock(&ifpub->lock);
3996 						ipv6_create_tempaddr(ifpub, ifp);
3997 						in6_ifa_put(ifpub);
3998 						in6_ifa_put(ifp);
3999 						goto restart;
4000 					}
4001 				} else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4002 					next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4003 				spin_unlock(&ifp->lock);
4004 			} else {
4005 				/* ifp->prefered_lft <= ifp->valid_lft */
4006 				if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4007 					next = ifp->tstamp + ifp->prefered_lft * HZ;
4008 				spin_unlock(&ifp->lock);
4009 			}
4010 		}
4011 	}
4012 
4013 	next_sec = round_jiffies_up(next);
4014 	next_sched = next;
4015 
4016 	/* If rounded timeout is accurate enough, accept it. */
4017 	if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4018 		next_sched = next_sec;
4019 
4020 	/* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4021 	if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4022 		next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4023 
4024 	ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4025 	      now, next, next_sec, next_sched);
4026 	mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
4027 	rcu_read_unlock_bh();
4028 }
4029 
4030 static void addrconf_verify_work(struct work_struct *w)
4031 {
4032 	rtnl_lock();
4033 	addrconf_verify_rtnl();
4034 	rtnl_unlock();
4035 }
4036 
4037 static void addrconf_verify(void)
4038 {
4039 	mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4040 }
4041 
4042 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4043 				     struct in6_addr **peer_pfx)
4044 {
4045 	struct in6_addr *pfx = NULL;
4046 
4047 	*peer_pfx = NULL;
4048 
4049 	if (addr)
4050 		pfx = nla_data(addr);
4051 
4052 	if (local) {
4053 		if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
4054 			*peer_pfx = pfx;
4055 		pfx = nla_data(local);
4056 	}
4057 
4058 	return pfx;
4059 }
4060 
4061 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
4062 	[IFA_ADDRESS]		= { .len = sizeof(struct in6_addr) },
4063 	[IFA_LOCAL]		= { .len = sizeof(struct in6_addr) },
4064 	[IFA_CACHEINFO]		= { .len = sizeof(struct ifa_cacheinfo) },
4065 	[IFA_FLAGS]		= { .len = sizeof(u32) },
4066 };
4067 
4068 static int
4069 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
4070 {
4071 	struct net *net = sock_net(skb->sk);
4072 	struct ifaddrmsg *ifm;
4073 	struct nlattr *tb[IFA_MAX+1];
4074 	struct in6_addr *pfx, *peer_pfx;
4075 	u32 ifa_flags;
4076 	int err;
4077 
4078 	err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4079 	if (err < 0)
4080 		return err;
4081 
4082 	ifm = nlmsg_data(nlh);
4083 	pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4084 	if (!pfx)
4085 		return -EINVAL;
4086 
4087 	ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4088 
4089 	/* We ignore other flags so far. */
4090 	ifa_flags &= IFA_F_MANAGETEMPADDR;
4091 
4092 	return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4093 			      ifm->ifa_prefixlen);
4094 }
4095 
4096 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
4097 			     u32 prefered_lft, u32 valid_lft)
4098 {
4099 	u32 flags;
4100 	clock_t expires;
4101 	unsigned long timeout;
4102 	bool was_managetempaddr;
4103 	bool had_prefixroute;
4104 
4105 	ASSERT_RTNL();
4106 
4107 	if (!valid_lft || (prefered_lft > valid_lft))
4108 		return -EINVAL;
4109 
4110 	if (ifa_flags & IFA_F_MANAGETEMPADDR &&
4111 	    (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4112 		return -EINVAL;
4113 
4114 	timeout = addrconf_timeout_fixup(valid_lft, HZ);
4115 	if (addrconf_finite_timeout(timeout)) {
4116 		expires = jiffies_to_clock_t(timeout * HZ);
4117 		valid_lft = timeout;
4118 		flags = RTF_EXPIRES;
4119 	} else {
4120 		expires = 0;
4121 		flags = 0;
4122 		ifa_flags |= IFA_F_PERMANENT;
4123 	}
4124 
4125 	timeout = addrconf_timeout_fixup(prefered_lft, HZ);
4126 	if (addrconf_finite_timeout(timeout)) {
4127 		if (timeout == 0)
4128 			ifa_flags |= IFA_F_DEPRECATED;
4129 		prefered_lft = timeout;
4130 	}
4131 
4132 	spin_lock_bh(&ifp->lock);
4133 	was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
4134 	had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4135 			  !(ifp->flags & IFA_F_NOPREFIXROUTE);
4136 	ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
4137 			IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4138 			IFA_F_NOPREFIXROUTE);
4139 	ifp->flags |= ifa_flags;
4140 	ifp->tstamp = jiffies;
4141 	ifp->valid_lft = valid_lft;
4142 	ifp->prefered_lft = prefered_lft;
4143 
4144 	spin_unlock_bh(&ifp->lock);
4145 	if (!(ifp->flags&IFA_F_TENTATIVE))
4146 		ipv6_ifa_notify(0, ifp);
4147 
4148 	if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
4149 		addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
4150 				      expires, flags);
4151 	} else if (had_prefixroute) {
4152 		enum cleanup_prefix_rt_t action;
4153 		unsigned long rt_expires;
4154 
4155 		write_lock_bh(&ifp->idev->lock);
4156 		action = check_cleanup_prefix_route(ifp, &rt_expires);
4157 		write_unlock_bh(&ifp->idev->lock);
4158 
4159 		if (action != CLEANUP_PREFIX_RT_NOP) {
4160 			cleanup_prefix_route(ifp, rt_expires,
4161 				action == CLEANUP_PREFIX_RT_DEL);
4162 		}
4163 	}
4164 
4165 	if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4166 		if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
4167 			valid_lft = prefered_lft = 0;
4168 		manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
4169 				 !was_managetempaddr, jiffies);
4170 	}
4171 
4172 	addrconf_verify_rtnl();
4173 
4174 	return 0;
4175 }
4176 
4177 static int
4178 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
4179 {
4180 	struct net *net = sock_net(skb->sk);
4181 	struct ifaddrmsg *ifm;
4182 	struct nlattr *tb[IFA_MAX+1];
4183 	struct in6_addr *pfx, *peer_pfx;
4184 	struct inet6_ifaddr *ifa;
4185 	struct net_device *dev;
4186 	u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
4187 	u32 ifa_flags;
4188 	int err;
4189 
4190 	err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4191 	if (err < 0)
4192 		return err;
4193 
4194 	ifm = nlmsg_data(nlh);
4195 	pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4196 	if (!pfx)
4197 		return -EINVAL;
4198 
4199 	if (tb[IFA_CACHEINFO]) {
4200 		struct ifa_cacheinfo *ci;
4201 
4202 		ci = nla_data(tb[IFA_CACHEINFO]);
4203 		valid_lft = ci->ifa_valid;
4204 		preferred_lft = ci->ifa_prefered;
4205 	} else {
4206 		preferred_lft = INFINITY_LIFE_TIME;
4207 		valid_lft = INFINITY_LIFE_TIME;
4208 	}
4209 
4210 	dev =  __dev_get_by_index(net, ifm->ifa_index);
4211 	if (!dev)
4212 		return -ENODEV;
4213 
4214 	ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4215 
4216 	/* We ignore other flags so far. */
4217 	ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4218 		     IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN;
4219 
4220 	ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
4221 	if (!ifa) {
4222 		/*
4223 		 * It would be best to check for !NLM_F_CREATE here but
4224 		 * userspace already relies on not having to provide this.
4225 		 */
4226 		return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
4227 				      ifm->ifa_prefixlen, ifa_flags,
4228 				      preferred_lft, valid_lft);
4229 	}
4230 
4231 	if (nlh->nlmsg_flags & NLM_F_EXCL ||
4232 	    !(nlh->nlmsg_flags & NLM_F_REPLACE))
4233 		err = -EEXIST;
4234 	else
4235 		err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
4236 
4237 	in6_ifa_put(ifa);
4238 
4239 	return err;
4240 }
4241 
4242 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
4243 			  u8 scope, int ifindex)
4244 {
4245 	struct ifaddrmsg *ifm;
4246 
4247 	ifm = nlmsg_data(nlh);
4248 	ifm->ifa_family = AF_INET6;
4249 	ifm->ifa_prefixlen = prefixlen;
4250 	ifm->ifa_flags = flags;
4251 	ifm->ifa_scope = scope;
4252 	ifm->ifa_index = ifindex;
4253 }
4254 
4255 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4256 			 unsigned long tstamp, u32 preferred, u32 valid)
4257 {
4258 	struct ifa_cacheinfo ci;
4259 
4260 	ci.cstamp = cstamp_delta(cstamp);
4261 	ci.tstamp = cstamp_delta(tstamp);
4262 	ci.ifa_prefered = preferred;
4263 	ci.ifa_valid = valid;
4264 
4265 	return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4266 }
4267 
4268 static inline int rt_scope(int ifa_scope)
4269 {
4270 	if (ifa_scope & IFA_HOST)
4271 		return RT_SCOPE_HOST;
4272 	else if (ifa_scope & IFA_LINK)
4273 		return RT_SCOPE_LINK;
4274 	else if (ifa_scope & IFA_SITE)
4275 		return RT_SCOPE_SITE;
4276 	else
4277 		return RT_SCOPE_UNIVERSE;
4278 }
4279 
4280 static inline int inet6_ifaddr_msgsize(void)
4281 {
4282 	return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
4283 	       + nla_total_size(16) /* IFA_LOCAL */
4284 	       + nla_total_size(16) /* IFA_ADDRESS */
4285 	       + nla_total_size(sizeof(struct ifa_cacheinfo))
4286 	       + nla_total_size(4)  /* IFA_FLAGS */;
4287 }
4288 
4289 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
4290 			     u32 portid, u32 seq, int event, unsigned int flags)
4291 {
4292 	struct nlmsghdr  *nlh;
4293 	u32 preferred, valid;
4294 
4295 	nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4296 	if (!nlh)
4297 		return -EMSGSIZE;
4298 
4299 	put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4300 		      ifa->idev->dev->ifindex);
4301 
4302 	if (!((ifa->flags&IFA_F_PERMANENT) &&
4303 	      (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
4304 		preferred = ifa->prefered_lft;
4305 		valid = ifa->valid_lft;
4306 		if (preferred != INFINITY_LIFE_TIME) {
4307 			long tval = (jiffies - ifa->tstamp)/HZ;
4308 			if (preferred > tval)
4309 				preferred -= tval;
4310 			else
4311 				preferred = 0;
4312 			if (valid != INFINITY_LIFE_TIME) {
4313 				if (valid > tval)
4314 					valid -= tval;
4315 				else
4316 					valid = 0;
4317 			}
4318 		}
4319 	} else {
4320 		preferred = INFINITY_LIFE_TIME;
4321 		valid = INFINITY_LIFE_TIME;
4322 	}
4323 
4324 	if (!ipv6_addr_any(&ifa->peer_addr)) {
4325 		if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4326 		    nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
4327 			goto error;
4328 	} else
4329 		if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
4330 			goto error;
4331 
4332 	if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4333 		goto error;
4334 
4335 	if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4336 		goto error;
4337 
4338 	nlmsg_end(skb, nlh);
4339 	return 0;
4340 
4341 error:
4342 	nlmsg_cancel(skb, nlh);
4343 	return -EMSGSIZE;
4344 }
4345 
4346 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
4347 				u32 portid, u32 seq, int event, u16 flags)
4348 {
4349 	struct nlmsghdr  *nlh;
4350 	u8 scope = RT_SCOPE_UNIVERSE;
4351 	int ifindex = ifmca->idev->dev->ifindex;
4352 
4353 	if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4354 		scope = RT_SCOPE_SITE;
4355 
4356 	nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4357 	if (!nlh)
4358 		return -EMSGSIZE;
4359 
4360 	put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4361 	if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
4362 	    put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
4363 			  INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4364 		nlmsg_cancel(skb, nlh);
4365 		return -EMSGSIZE;
4366 	}
4367 
4368 	nlmsg_end(skb, nlh);
4369 	return 0;
4370 }
4371 
4372 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
4373 				u32 portid, u32 seq, int event, unsigned int flags)
4374 {
4375 	struct nlmsghdr  *nlh;
4376 	u8 scope = RT_SCOPE_UNIVERSE;
4377 	int ifindex = ifaca->aca_idev->dev->ifindex;
4378 
4379 	if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4380 		scope = RT_SCOPE_SITE;
4381 
4382 	nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4383 	if (!nlh)
4384 		return -EMSGSIZE;
4385 
4386 	put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4387 	if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
4388 	    put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
4389 			  INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4390 		nlmsg_cancel(skb, nlh);
4391 		return -EMSGSIZE;
4392 	}
4393 
4394 	nlmsg_end(skb, nlh);
4395 	return 0;
4396 }
4397 
4398 enum addr_type_t {
4399 	UNICAST_ADDR,
4400 	MULTICAST_ADDR,
4401 	ANYCAST_ADDR,
4402 };
4403 
4404 /* called with rcu_read_lock() */
4405 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4406 			  struct netlink_callback *cb, enum addr_type_t type,
4407 			  int s_ip_idx, int *p_ip_idx)
4408 {
4409 	struct ifmcaddr6 *ifmca;
4410 	struct ifacaddr6 *ifaca;
4411 	int err = 1;
4412 	int ip_idx = *p_ip_idx;
4413 
4414 	read_lock_bh(&idev->lock);
4415 	switch (type) {
4416 	case UNICAST_ADDR: {
4417 		struct inet6_ifaddr *ifa;
4418 
4419 		/* unicast address incl. temp addr */
4420 		list_for_each_entry(ifa, &idev->addr_list, if_list) {
4421 			if (++ip_idx < s_ip_idx)
4422 				continue;
4423 			err = inet6_fill_ifaddr(skb, ifa,
4424 						NETLINK_CB(cb->skb).portid,
4425 						cb->nlh->nlmsg_seq,
4426 						RTM_NEWADDR,
4427 						NLM_F_MULTI);
4428 			if (err < 0)
4429 				break;
4430 			nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4431 		}
4432 		break;
4433 	}
4434 	case MULTICAST_ADDR:
4435 		/* multicast address */
4436 		for (ifmca = idev->mc_list; ifmca;
4437 		     ifmca = ifmca->next, ip_idx++) {
4438 			if (ip_idx < s_ip_idx)
4439 				continue;
4440 			err = inet6_fill_ifmcaddr(skb, ifmca,
4441 						  NETLINK_CB(cb->skb).portid,
4442 						  cb->nlh->nlmsg_seq,
4443 						  RTM_GETMULTICAST,
4444 						  NLM_F_MULTI);
4445 			if (err < 0)
4446 				break;
4447 		}
4448 		break;
4449 	case ANYCAST_ADDR:
4450 		/* anycast address */
4451 		for (ifaca = idev->ac_list; ifaca;
4452 		     ifaca = ifaca->aca_next, ip_idx++) {
4453 			if (ip_idx < s_ip_idx)
4454 				continue;
4455 			err = inet6_fill_ifacaddr(skb, ifaca,
4456 						  NETLINK_CB(cb->skb).portid,
4457 						  cb->nlh->nlmsg_seq,
4458 						  RTM_GETANYCAST,
4459 						  NLM_F_MULTI);
4460 			if (err < 0)
4461 				break;
4462 		}
4463 		break;
4464 	default:
4465 		break;
4466 	}
4467 	read_unlock_bh(&idev->lock);
4468 	*p_ip_idx = ip_idx;
4469 	return err;
4470 }
4471 
4472 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4473 			   enum addr_type_t type)
4474 {
4475 	struct net *net = sock_net(skb->sk);
4476 	int h, s_h;
4477 	int idx, ip_idx;
4478 	int s_idx, s_ip_idx;
4479 	struct net_device *dev;
4480 	struct inet6_dev *idev;
4481 	struct hlist_head *head;
4482 
4483 	s_h = cb->args[0];
4484 	s_idx = idx = cb->args[1];
4485 	s_ip_idx = ip_idx = cb->args[2];
4486 
4487 	rcu_read_lock();
4488 	cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
4489 	for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4490 		idx = 0;
4491 		head = &net->dev_index_head[h];
4492 		hlist_for_each_entry_rcu(dev, head, index_hlist) {
4493 			if (idx < s_idx)
4494 				goto cont;
4495 			if (h > s_h || idx > s_idx)
4496 				s_ip_idx = 0;
4497 			ip_idx = 0;
4498 			idev = __in6_dev_get(dev);
4499 			if (!idev)
4500 				goto cont;
4501 
4502 			if (in6_dump_addrs(idev, skb, cb, type,
4503 					   s_ip_idx, &ip_idx) < 0)
4504 				goto done;
4505 cont:
4506 			idx++;
4507 		}
4508 	}
4509 done:
4510 	rcu_read_unlock();
4511 	cb->args[0] = h;
4512 	cb->args[1] = idx;
4513 	cb->args[2] = ip_idx;
4514 
4515 	return skb->len;
4516 }
4517 
4518 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4519 {
4520 	enum addr_type_t type = UNICAST_ADDR;
4521 
4522 	return inet6_dump_addr(skb, cb, type);
4523 }
4524 
4525 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4526 {
4527 	enum addr_type_t type = MULTICAST_ADDR;
4528 
4529 	return inet6_dump_addr(skb, cb, type);
4530 }
4531 
4532 
4533 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4534 {
4535 	enum addr_type_t type = ANYCAST_ADDR;
4536 
4537 	return inet6_dump_addr(skb, cb, type);
4538 }
4539 
4540 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
4541 {
4542 	struct net *net = sock_net(in_skb->sk);
4543 	struct ifaddrmsg *ifm;
4544 	struct nlattr *tb[IFA_MAX+1];
4545 	struct in6_addr *addr = NULL, *peer;
4546 	struct net_device *dev = NULL;
4547 	struct inet6_ifaddr *ifa;
4548 	struct sk_buff *skb;
4549 	int err;
4550 
4551 	err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4552 	if (err < 0)
4553 		goto errout;
4554 
4555 	addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
4556 	if (!addr) {
4557 		err = -EINVAL;
4558 		goto errout;
4559 	}
4560 
4561 	ifm = nlmsg_data(nlh);
4562 	if (ifm->ifa_index)
4563 		dev = __dev_get_by_index(net, ifm->ifa_index);
4564 
4565 	ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4566 	if (!ifa) {
4567 		err = -EADDRNOTAVAIL;
4568 		goto errout;
4569 	}
4570 
4571 	skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4572 	if (!skb) {
4573 		err = -ENOBUFS;
4574 		goto errout_ifa;
4575 	}
4576 
4577 	err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
4578 				nlh->nlmsg_seq, RTM_NEWADDR, 0);
4579 	if (err < 0) {
4580 		/* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4581 		WARN_ON(err == -EMSGSIZE);
4582 		kfree_skb(skb);
4583 		goto errout_ifa;
4584 	}
4585 	err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
4586 errout_ifa:
4587 	in6_ifa_put(ifa);
4588 errout:
4589 	return err;
4590 }
4591 
4592 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4593 {
4594 	struct sk_buff *skb;
4595 	struct net *net = dev_net(ifa->idev->dev);
4596 	int err = -ENOBUFS;
4597 
4598 	skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
4599 	if (!skb)
4600 		goto errout;
4601 
4602 	err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
4603 	if (err < 0) {
4604 		/* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4605 		WARN_ON(err == -EMSGSIZE);
4606 		kfree_skb(skb);
4607 		goto errout;
4608 	}
4609 	rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4610 	return;
4611 errout:
4612 	if (err < 0)
4613 		rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
4614 }
4615 
4616 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
4617 				__s32 *array, int bytes)
4618 {
4619 	BUG_ON(bytes < (DEVCONF_MAX * 4));
4620 
4621 	memset(array, 0, bytes);
4622 	array[DEVCONF_FORWARDING] = cnf->forwarding;
4623 	array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4624 	array[DEVCONF_MTU6] = cnf->mtu6;
4625 	array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4626 	array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4627 	array[DEVCONF_AUTOCONF] = cnf->autoconf;
4628 	array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4629 	array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
4630 	array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4631 		jiffies_to_msecs(cnf->rtr_solicit_interval);
4632 	array[DEVCONF_RTR_SOLICIT_DELAY] =
4633 		jiffies_to_msecs(cnf->rtr_solicit_delay);
4634 	array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
4635 	array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
4636 		jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
4637 	array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
4638 		jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
4639 	array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4640 	array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4641 	array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4642 	array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4643 	array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
4644 	array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
4645 	array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
4646 	array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
4647 	array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
4648 #ifdef CONFIG_IPV6_ROUTER_PREF
4649 	array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
4650 	array[DEVCONF_RTR_PROBE_INTERVAL] =
4651 		jiffies_to_msecs(cnf->rtr_probe_interval);
4652 #ifdef CONFIG_IPV6_ROUTE_INFO
4653 	array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4654 #endif
4655 #endif
4656 	array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
4657 	array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
4658 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4659 	array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
4660 	array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
4661 #endif
4662 #ifdef CONFIG_IPV6_MROUTE
4663 	array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4664 #endif
4665 	array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
4666 	array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
4667 	array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
4668 	array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
4669 	array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
4670 	array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
4671 	array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
4672 	array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
4673 	/* we omit DEVCONF_STABLE_SECRET for now */
4674 	array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
4675 }
4676 
4677 static inline size_t inet6_ifla6_size(void)
4678 {
4679 	return nla_total_size(4) /* IFLA_INET6_FLAGS */
4680 	     + nla_total_size(sizeof(struct ifla_cacheinfo))
4681 	     + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4682 	     + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
4683 	     + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4684 	     + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
4685 }
4686 
4687 static inline size_t inet6_if_nlmsg_size(void)
4688 {
4689 	return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4690 	       + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4691 	       + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4692 	       + nla_total_size(4) /* IFLA_MTU */
4693 	       + nla_total_size(4) /* IFLA_LINK */
4694 	       + nla_total_size(1) /* IFLA_OPERSTATE */
4695 	       + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
4696 }
4697 
4698 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
4699 				      int items, int bytes)
4700 {
4701 	int i;
4702 	int pad = bytes - sizeof(u64) * items;
4703 	BUG_ON(pad < 0);
4704 
4705 	/* Use put_unaligned() because stats may not be aligned for u64. */
4706 	put_unaligned(items, &stats[0]);
4707 	for (i = 1; i < items; i++)
4708 		put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
4709 
4710 	memset(&stats[items], 0, pad);
4711 }
4712 
4713 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
4714 					int bytes, size_t syncpoff)
4715 {
4716 	int i, c;
4717 	u64 buff[IPSTATS_MIB_MAX];
4718 	int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
4719 
4720 	BUG_ON(pad < 0);
4721 
4722 	memset(buff, 0, sizeof(buff));
4723 	buff[0] = IPSTATS_MIB_MAX;
4724 
4725 	for_each_possible_cpu(c) {
4726 		for (i = 1; i < IPSTATS_MIB_MAX; i++)
4727 			buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
4728 	}
4729 
4730 	memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
4731 	memset(&stats[IPSTATS_MIB_MAX], 0, pad);
4732 }
4733 
4734 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4735 			     int bytes)
4736 {
4737 	switch (attrtype) {
4738 	case IFLA_INET6_STATS:
4739 		__snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
4740 				     offsetof(struct ipstats_mib, syncp));
4741 		break;
4742 	case IFLA_INET6_ICMP6STATS:
4743 		__snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
4744 		break;
4745 	}
4746 }
4747 
4748 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
4749 				  u32 ext_filter_mask)
4750 {
4751 	struct nlattr *nla;
4752 	struct ifla_cacheinfo ci;
4753 
4754 	if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4755 		goto nla_put_failure;
4756 	ci.max_reasm_len = IPV6_MAXPLEN;
4757 	ci.tstamp = cstamp_delta(idev->tstamp);
4758 	ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
4759 	ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
4760 	if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4761 		goto nla_put_failure;
4762 	nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
4763 	if (!nla)
4764 		goto nla_put_failure;
4765 	ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4766 
4767 	/* XXX - MC not implemented */
4768 
4769 	if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
4770 		return 0;
4771 
4772 	nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4773 	if (!nla)
4774 		goto nla_put_failure;
4775 	snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4776 
4777 	nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4778 	if (!nla)
4779 		goto nla_put_failure;
4780 	snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4781 
4782 	nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
4783 	if (!nla)
4784 		goto nla_put_failure;
4785 
4786 	if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->addr_gen_mode))
4787 		goto nla_put_failure;
4788 
4789 	read_lock_bh(&idev->lock);
4790 	memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
4791 	read_unlock_bh(&idev->lock);
4792 
4793 	return 0;
4794 
4795 nla_put_failure:
4796 	return -EMSGSIZE;
4797 }
4798 
4799 static size_t inet6_get_link_af_size(const struct net_device *dev,
4800 				     u32 ext_filter_mask)
4801 {
4802 	if (!__in6_dev_get(dev))
4803 		return 0;
4804 
4805 	return inet6_ifla6_size();
4806 }
4807 
4808 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
4809 			      u32 ext_filter_mask)
4810 {
4811 	struct inet6_dev *idev = __in6_dev_get(dev);
4812 
4813 	if (!idev)
4814 		return -ENODATA;
4815 
4816 	if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
4817 		return -EMSGSIZE;
4818 
4819 	return 0;
4820 }
4821 
4822 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
4823 {
4824 	struct inet6_ifaddr *ifp;
4825 	struct net_device *dev = idev->dev;
4826 	bool update_rs = false;
4827 	struct in6_addr ll_addr;
4828 
4829 	ASSERT_RTNL();
4830 
4831 	if (!token)
4832 		return -EINVAL;
4833 	if (ipv6_addr_any(token))
4834 		return -EINVAL;
4835 	if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
4836 		return -EINVAL;
4837 	if (!ipv6_accept_ra(idev))
4838 		return -EINVAL;
4839 	if (idev->cnf.rtr_solicits <= 0)
4840 		return -EINVAL;
4841 
4842 	write_lock_bh(&idev->lock);
4843 
4844 	BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
4845 	memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
4846 
4847 	write_unlock_bh(&idev->lock);
4848 
4849 	if (!idev->dead && (idev->if_flags & IF_READY) &&
4850 	    !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
4851 			     IFA_F_OPTIMISTIC)) {
4852 
4853 		/* If we're not ready, then normal ifup will take care
4854 		 * of this. Otherwise, we need to request our rs here.
4855 		 */
4856 		ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
4857 		update_rs = true;
4858 	}
4859 
4860 	write_lock_bh(&idev->lock);
4861 
4862 	if (update_rs) {
4863 		idev->if_flags |= IF_RS_SENT;
4864 		idev->rs_probes = 1;
4865 		addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval);
4866 	}
4867 
4868 	/* Well, that's kinda nasty ... */
4869 	list_for_each_entry(ifp, &idev->addr_list, if_list) {
4870 		spin_lock(&ifp->lock);
4871 		if (ifp->tokenized) {
4872 			ifp->valid_lft = 0;
4873 			ifp->prefered_lft = 0;
4874 		}
4875 		spin_unlock(&ifp->lock);
4876 	}
4877 
4878 	write_unlock_bh(&idev->lock);
4879 	inet6_ifinfo_notify(RTM_NEWLINK, idev);
4880 	addrconf_verify_rtnl();
4881 	return 0;
4882 }
4883 
4884 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
4885 	[IFLA_INET6_ADDR_GEN_MODE]	= { .type = NLA_U8 },
4886 	[IFLA_INET6_TOKEN]		= { .len = sizeof(struct in6_addr) },
4887 };
4888 
4889 static int inet6_validate_link_af(const struct net_device *dev,
4890 				  const struct nlattr *nla)
4891 {
4892 	struct nlattr *tb[IFLA_INET6_MAX + 1];
4893 
4894 	if (dev && !__in6_dev_get(dev))
4895 		return -EAFNOSUPPORT;
4896 
4897 	return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy);
4898 }
4899 
4900 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
4901 {
4902 	int err = -EINVAL;
4903 	struct inet6_dev *idev = __in6_dev_get(dev);
4904 	struct nlattr *tb[IFLA_INET6_MAX + 1];
4905 
4906 	if (!idev)
4907 		return -EAFNOSUPPORT;
4908 
4909 	if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
4910 		BUG();
4911 
4912 	if (tb[IFLA_INET6_TOKEN]) {
4913 		err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
4914 		if (err)
4915 			return err;
4916 	}
4917 
4918 	if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
4919 		u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
4920 
4921 		if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
4922 		    mode != IN6_ADDR_GEN_MODE_NONE &&
4923 		    mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY)
4924 			return -EINVAL;
4925 
4926 		if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
4927 		    !idev->cnf.stable_secret.initialized &&
4928 		    !dev_net(dev)->ipv6.devconf_dflt->stable_secret.initialized)
4929 			return -EINVAL;
4930 
4931 		idev->addr_gen_mode = mode;
4932 		err = 0;
4933 	}
4934 
4935 	return err;
4936 }
4937 
4938 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
4939 			     u32 portid, u32 seq, int event, unsigned int flags)
4940 {
4941 	struct net_device *dev = idev->dev;
4942 	struct ifinfomsg *hdr;
4943 	struct nlmsghdr *nlh;
4944 	void *protoinfo;
4945 
4946 	nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
4947 	if (!nlh)
4948 		return -EMSGSIZE;
4949 
4950 	hdr = nlmsg_data(nlh);
4951 	hdr->ifi_family = AF_INET6;
4952 	hdr->__ifi_pad = 0;
4953 	hdr->ifi_type = dev->type;
4954 	hdr->ifi_index = dev->ifindex;
4955 	hdr->ifi_flags = dev_get_flags(dev);
4956 	hdr->ifi_change = 0;
4957 
4958 	if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4959 	    (dev->addr_len &&
4960 	     nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4961 	    nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4962 	    (dev->ifindex != dev_get_iflink(dev) &&
4963 	     nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
4964 	    nla_put_u8(skb, IFLA_OPERSTATE,
4965 		       netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
4966 		goto nla_put_failure;
4967 	protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4968 	if (!protoinfo)
4969 		goto nla_put_failure;
4970 
4971 	if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
4972 		goto nla_put_failure;
4973 
4974 	nla_nest_end(skb, protoinfo);
4975 	nlmsg_end(skb, nlh);
4976 	return 0;
4977 
4978 nla_put_failure:
4979 	nlmsg_cancel(skb, nlh);
4980 	return -EMSGSIZE;
4981 }
4982 
4983 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4984 {
4985 	struct net *net = sock_net(skb->sk);
4986 	int h, s_h;
4987 	int idx = 0, s_idx;
4988 	struct net_device *dev;
4989 	struct inet6_dev *idev;
4990 	struct hlist_head *head;
4991 
4992 	s_h = cb->args[0];
4993 	s_idx = cb->args[1];
4994 
4995 	rcu_read_lock();
4996 	for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4997 		idx = 0;
4998 		head = &net->dev_index_head[h];
4999 		hlist_for_each_entry_rcu(dev, head, index_hlist) {
5000 			if (idx < s_idx)
5001 				goto cont;
5002 			idev = __in6_dev_get(dev);
5003 			if (!idev)
5004 				goto cont;
5005 			if (inet6_fill_ifinfo(skb, idev,
5006 					      NETLINK_CB(cb->skb).portid,
5007 					      cb->nlh->nlmsg_seq,
5008 					      RTM_NEWLINK, NLM_F_MULTI) < 0)
5009 				goto out;
5010 cont:
5011 			idx++;
5012 		}
5013 	}
5014 out:
5015 	rcu_read_unlock();
5016 	cb->args[1] = idx;
5017 	cb->args[0] = h;
5018 
5019 	return skb->len;
5020 }
5021 
5022 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
5023 {
5024 	struct sk_buff *skb;
5025 	struct net *net = dev_net(idev->dev);
5026 	int err = -ENOBUFS;
5027 
5028 	skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
5029 	if (!skb)
5030 		goto errout;
5031 
5032 	err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
5033 	if (err < 0) {
5034 		/* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
5035 		WARN_ON(err == -EMSGSIZE);
5036 		kfree_skb(skb);
5037 		goto errout;
5038 	}
5039 	rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
5040 	return;
5041 errout:
5042 	if (err < 0)
5043 		rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
5044 }
5045 
5046 static inline size_t inet6_prefix_nlmsg_size(void)
5047 {
5048 	return NLMSG_ALIGN(sizeof(struct prefixmsg))
5049 	       + nla_total_size(sizeof(struct in6_addr))
5050 	       + nla_total_size(sizeof(struct prefix_cacheinfo));
5051 }
5052 
5053 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
5054 			     struct prefix_info *pinfo, u32 portid, u32 seq,
5055 			     int event, unsigned int flags)
5056 {
5057 	struct prefixmsg *pmsg;
5058 	struct nlmsghdr *nlh;
5059 	struct prefix_cacheinfo	ci;
5060 
5061 	nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
5062 	if (!nlh)
5063 		return -EMSGSIZE;
5064 
5065 	pmsg = nlmsg_data(nlh);
5066 	pmsg->prefix_family = AF_INET6;
5067 	pmsg->prefix_pad1 = 0;
5068 	pmsg->prefix_pad2 = 0;
5069 	pmsg->prefix_ifindex = idev->dev->ifindex;
5070 	pmsg->prefix_len = pinfo->prefix_len;
5071 	pmsg->prefix_type = pinfo->type;
5072 	pmsg->prefix_pad3 = 0;
5073 	pmsg->prefix_flags = 0;
5074 	if (pinfo->onlink)
5075 		pmsg->prefix_flags |= IF_PREFIX_ONLINK;
5076 	if (pinfo->autoconf)
5077 		pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
5078 
5079 	if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
5080 		goto nla_put_failure;
5081 	ci.preferred_time = ntohl(pinfo->prefered);
5082 	ci.valid_time = ntohl(pinfo->valid);
5083 	if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
5084 		goto nla_put_failure;
5085 	nlmsg_end(skb, nlh);
5086 	return 0;
5087 
5088 nla_put_failure:
5089 	nlmsg_cancel(skb, nlh);
5090 	return -EMSGSIZE;
5091 }
5092 
5093 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
5094 			 struct prefix_info *pinfo)
5095 {
5096 	struct sk_buff *skb;
5097 	struct net *net = dev_net(idev->dev);
5098 	int err = -ENOBUFS;
5099 
5100 	skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
5101 	if (!skb)
5102 		goto errout;
5103 
5104 	err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
5105 	if (err < 0) {
5106 		/* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
5107 		WARN_ON(err == -EMSGSIZE);
5108 		kfree_skb(skb);
5109 		goto errout;
5110 	}
5111 	rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
5112 	return;
5113 errout:
5114 	if (err < 0)
5115 		rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
5116 }
5117 
5118 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5119 {
5120 	struct net *net = dev_net(ifp->idev->dev);
5121 
5122 	if (event)
5123 		ASSERT_RTNL();
5124 
5125 	inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
5126 
5127 	switch (event) {
5128 	case RTM_NEWADDR:
5129 		/*
5130 		 * If the address was optimistic
5131 		 * we inserted the route at the start of
5132 		 * our DAD process, so we don't need
5133 		 * to do it again
5134 		 */
5135 		if (!(ifp->rt->rt6i_node))
5136 			ip6_ins_rt(ifp->rt);
5137 		if (ifp->idev->cnf.forwarding)
5138 			addrconf_join_anycast(ifp);
5139 		if (!ipv6_addr_any(&ifp->peer_addr))
5140 			addrconf_prefix_route(&ifp->peer_addr, 128,
5141 					      ifp->idev->dev, 0, 0);
5142 		break;
5143 	case RTM_DELADDR:
5144 		if (ifp->idev->cnf.forwarding)
5145 			addrconf_leave_anycast(ifp);
5146 		addrconf_leave_solict(ifp->idev, &ifp->addr);
5147 		if (!ipv6_addr_any(&ifp->peer_addr)) {
5148 			struct rt6_info *rt;
5149 
5150 			rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
5151 						       ifp->idev->dev, 0, 0);
5152 			if (rt)
5153 				ip6_del_rt(rt);
5154 		}
5155 		dst_hold(&ifp->rt->dst);
5156 
5157 		ip6_del_rt(ifp->rt);
5158 
5159 		rt_genid_bump_ipv6(net);
5160 		break;
5161 	}
5162 	atomic_inc(&net->ipv6.dev_addr_genid);
5163 }
5164 
5165 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5166 {
5167 	rcu_read_lock_bh();
5168 	if (likely(ifp->idev->dead == 0))
5169 		__ipv6_ifa_notify(event, ifp);
5170 	rcu_read_unlock_bh();
5171 }
5172 
5173 #ifdef CONFIG_SYSCTL
5174 
5175 static
5176 int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
5177 			   void __user *buffer, size_t *lenp, loff_t *ppos)
5178 {
5179 	int *valp = ctl->data;
5180 	int val = *valp;
5181 	loff_t pos = *ppos;
5182 	struct ctl_table lctl;
5183 	int ret;
5184 
5185 	/*
5186 	 * ctl->data points to idev->cnf.forwarding, we should
5187 	 * not modify it until we get the rtnl lock.
5188 	 */
5189 	lctl = *ctl;
5190 	lctl.data = &val;
5191 
5192 	ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5193 
5194 	if (write)
5195 		ret = addrconf_fixup_forwarding(ctl, valp, val);
5196 	if (ret)
5197 		*ppos = pos;
5198 	return ret;
5199 }
5200 
5201 static
5202 int addrconf_sysctl_hop_limit(struct ctl_table *ctl, int write,
5203                               void __user *buffer, size_t *lenp, loff_t *ppos)
5204 {
5205 	struct ctl_table lctl;
5206 	int min_hl = 1, max_hl = 255;
5207 
5208 	lctl = *ctl;
5209 	lctl.extra1 = &min_hl;
5210 	lctl.extra2 = &max_hl;
5211 
5212 	return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5213 }
5214 
5215 static
5216 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
5217 			void __user *buffer, size_t *lenp, loff_t *ppos)
5218 {
5219 	struct inet6_dev *idev = ctl->extra1;
5220 	int min_mtu = IPV6_MIN_MTU;
5221 	struct ctl_table lctl;
5222 
5223 	lctl = *ctl;
5224 	lctl.extra1 = &min_mtu;
5225 	lctl.extra2 = idev ? &idev->dev->mtu : NULL;
5226 
5227 	return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5228 }
5229 
5230 static void dev_disable_change(struct inet6_dev *idev)
5231 {
5232 	struct netdev_notifier_info info;
5233 
5234 	if (!idev || !idev->dev)
5235 		return;
5236 
5237 	netdev_notifier_info_init(&info, idev->dev);
5238 	if (idev->cnf.disable_ipv6)
5239 		addrconf_notify(NULL, NETDEV_DOWN, &info);
5240 	else
5241 		addrconf_notify(NULL, NETDEV_UP, &info);
5242 }
5243 
5244 static void addrconf_disable_change(struct net *net, __s32 newf)
5245 {
5246 	struct net_device *dev;
5247 	struct inet6_dev *idev;
5248 
5249 	rcu_read_lock();
5250 	for_each_netdev_rcu(net, dev) {
5251 		idev = __in6_dev_get(dev);
5252 		if (idev) {
5253 			int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
5254 			idev->cnf.disable_ipv6 = newf;
5255 			if (changed)
5256 				dev_disable_change(idev);
5257 		}
5258 	}
5259 	rcu_read_unlock();
5260 }
5261 
5262 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
5263 {
5264 	struct net *net;
5265 	int old;
5266 
5267 	if (!rtnl_trylock())
5268 		return restart_syscall();
5269 
5270 	net = (struct net *)table->extra2;
5271 	old = *p;
5272 	*p = newf;
5273 
5274 	if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
5275 		rtnl_unlock();
5276 		return 0;
5277 	}
5278 
5279 	if (p == &net->ipv6.devconf_all->disable_ipv6) {
5280 		net->ipv6.devconf_dflt->disable_ipv6 = newf;
5281 		addrconf_disable_change(net, newf);
5282 	} else if ((!newf) ^ (!old))
5283 		dev_disable_change((struct inet6_dev *)table->extra1);
5284 
5285 	rtnl_unlock();
5286 	return 0;
5287 }
5288 
5289 static
5290 int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
5291 			    void __user *buffer, size_t *lenp, loff_t *ppos)
5292 {
5293 	int *valp = ctl->data;
5294 	int val = *valp;
5295 	loff_t pos = *ppos;
5296 	struct ctl_table lctl;
5297 	int ret;
5298 
5299 	/*
5300 	 * ctl->data points to idev->cnf.disable_ipv6, we should
5301 	 * not modify it until we get the rtnl lock.
5302 	 */
5303 	lctl = *ctl;
5304 	lctl.data = &val;
5305 
5306 	ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5307 
5308 	if (write)
5309 		ret = addrconf_disable_ipv6(ctl, valp, val);
5310 	if (ret)
5311 		*ppos = pos;
5312 	return ret;
5313 }
5314 
5315 static
5316 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
5317 			      void __user *buffer, size_t *lenp, loff_t *ppos)
5318 {
5319 	int *valp = ctl->data;
5320 	int ret;
5321 	int old, new;
5322 
5323 	old = *valp;
5324 	ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5325 	new = *valp;
5326 
5327 	if (write && old != new) {
5328 		struct net *net = ctl->extra2;
5329 
5330 		if (!rtnl_trylock())
5331 			return restart_syscall();
5332 
5333 		if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
5334 			inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5335 						     NETCONFA_IFINDEX_DEFAULT,
5336 						     net->ipv6.devconf_dflt);
5337 		else if (valp == &net->ipv6.devconf_all->proxy_ndp)
5338 			inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5339 						     NETCONFA_IFINDEX_ALL,
5340 						     net->ipv6.devconf_all);
5341 		else {
5342 			struct inet6_dev *idev = ctl->extra1;
5343 
5344 			inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5345 						     idev->dev->ifindex,
5346 						     &idev->cnf);
5347 		}
5348 		rtnl_unlock();
5349 	}
5350 
5351 	return ret;
5352 }
5353 
5354 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
5355 					 void __user *buffer, size_t *lenp,
5356 					 loff_t *ppos)
5357 {
5358 	int err;
5359 	struct in6_addr addr;
5360 	char str[IPV6_MAX_STRLEN];
5361 	struct ctl_table lctl = *ctl;
5362 	struct net *net = ctl->extra2;
5363 	struct ipv6_stable_secret *secret = ctl->data;
5364 
5365 	if (&net->ipv6.devconf_all->stable_secret == ctl->data)
5366 		return -EIO;
5367 
5368 	lctl.maxlen = IPV6_MAX_STRLEN;
5369 	lctl.data = str;
5370 
5371 	if (!rtnl_trylock())
5372 		return restart_syscall();
5373 
5374 	if (!write && !secret->initialized) {
5375 		err = -EIO;
5376 		goto out;
5377 	}
5378 
5379 	if (!write) {
5380 		err = snprintf(str, sizeof(str), "%pI6",
5381 			       &secret->secret);
5382 		if (err >= sizeof(str)) {
5383 			err = -EIO;
5384 			goto out;
5385 		}
5386 	}
5387 
5388 	err = proc_dostring(&lctl, write, buffer, lenp, ppos);
5389 	if (err || !write)
5390 		goto out;
5391 
5392 	if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
5393 		err = -EIO;
5394 		goto out;
5395 	}
5396 
5397 	secret->initialized = true;
5398 	secret->secret = addr;
5399 
5400 	if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
5401 		struct net_device *dev;
5402 
5403 		for_each_netdev(net, dev) {
5404 			struct inet6_dev *idev = __in6_dev_get(dev);
5405 
5406 			if (idev) {
5407 				idev->addr_gen_mode =
5408 					IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5409 			}
5410 		}
5411 	} else {
5412 		struct inet6_dev *idev = ctl->extra1;
5413 
5414 		idev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5415 	}
5416 
5417 out:
5418 	rtnl_unlock();
5419 
5420 	return err;
5421 }
5422 
5423 static
5424 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
5425 						int write,
5426 						void __user *buffer,
5427 						size_t *lenp,
5428 						loff_t *ppos)
5429 {
5430 	int *valp = ctl->data;
5431 	int val = *valp;
5432 	loff_t pos = *ppos;
5433 	struct ctl_table lctl;
5434 	int ret;
5435 
5436 	/* ctl->data points to idev->cnf.ignore_routes_when_linkdown
5437 	 * we should not modify it until we get the rtnl lock.
5438 	 */
5439 	lctl = *ctl;
5440 	lctl.data = &val;
5441 
5442 	ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5443 
5444 	if (write)
5445 		ret = addrconf_fixup_linkdown(ctl, valp, val);
5446 	if (ret)
5447 		*ppos = pos;
5448 	return ret;
5449 }
5450 
5451 static struct addrconf_sysctl_table
5452 {
5453 	struct ctl_table_header *sysctl_header;
5454 	struct ctl_table addrconf_vars[DEVCONF_MAX+1];
5455 } addrconf_sysctl __read_mostly = {
5456 	.sysctl_header = NULL,
5457 	.addrconf_vars = {
5458 		{
5459 			.procname	= "forwarding",
5460 			.data		= &ipv6_devconf.forwarding,
5461 			.maxlen		= sizeof(int),
5462 			.mode		= 0644,
5463 			.proc_handler	= addrconf_sysctl_forward,
5464 		},
5465 		{
5466 			.procname	= "hop_limit",
5467 			.data		= &ipv6_devconf.hop_limit,
5468 			.maxlen		= sizeof(int),
5469 			.mode		= 0644,
5470 			.proc_handler	= addrconf_sysctl_hop_limit,
5471 		},
5472 		{
5473 			.procname	= "mtu",
5474 			.data		= &ipv6_devconf.mtu6,
5475 			.maxlen		= sizeof(int),
5476 			.mode		= 0644,
5477 			.proc_handler	= addrconf_sysctl_mtu,
5478 		},
5479 		{
5480 			.procname	= "accept_ra",
5481 			.data		= &ipv6_devconf.accept_ra,
5482 			.maxlen		= sizeof(int),
5483 			.mode		= 0644,
5484 			.proc_handler	= proc_dointvec,
5485 		},
5486 		{
5487 			.procname	= "accept_redirects",
5488 			.data		= &ipv6_devconf.accept_redirects,
5489 			.maxlen		= sizeof(int),
5490 			.mode		= 0644,
5491 			.proc_handler	= proc_dointvec,
5492 		},
5493 		{
5494 			.procname	= "autoconf",
5495 			.data		= &ipv6_devconf.autoconf,
5496 			.maxlen		= sizeof(int),
5497 			.mode		= 0644,
5498 			.proc_handler	= proc_dointvec,
5499 		},
5500 		{
5501 			.procname	= "dad_transmits",
5502 			.data		= &ipv6_devconf.dad_transmits,
5503 			.maxlen		= sizeof(int),
5504 			.mode		= 0644,
5505 			.proc_handler	= proc_dointvec,
5506 		},
5507 		{
5508 			.procname	= "router_solicitations",
5509 			.data		= &ipv6_devconf.rtr_solicits,
5510 			.maxlen		= sizeof(int),
5511 			.mode		= 0644,
5512 			.proc_handler	= proc_dointvec,
5513 		},
5514 		{
5515 			.procname	= "router_solicitation_interval",
5516 			.data		= &ipv6_devconf.rtr_solicit_interval,
5517 			.maxlen		= sizeof(int),
5518 			.mode		= 0644,
5519 			.proc_handler	= proc_dointvec_jiffies,
5520 		},
5521 		{
5522 			.procname	= "router_solicitation_delay",
5523 			.data		= &ipv6_devconf.rtr_solicit_delay,
5524 			.maxlen		= sizeof(int),
5525 			.mode		= 0644,
5526 			.proc_handler	= proc_dointvec_jiffies,
5527 		},
5528 		{
5529 			.procname	= "force_mld_version",
5530 			.data		= &ipv6_devconf.force_mld_version,
5531 			.maxlen		= sizeof(int),
5532 			.mode		= 0644,
5533 			.proc_handler	= proc_dointvec,
5534 		},
5535 		{
5536 			.procname	= "mldv1_unsolicited_report_interval",
5537 			.data		=
5538 				&ipv6_devconf.mldv1_unsolicited_report_interval,
5539 			.maxlen		= sizeof(int),
5540 			.mode		= 0644,
5541 			.proc_handler	= proc_dointvec_ms_jiffies,
5542 		},
5543 		{
5544 			.procname	= "mldv2_unsolicited_report_interval",
5545 			.data		=
5546 				&ipv6_devconf.mldv2_unsolicited_report_interval,
5547 			.maxlen		= sizeof(int),
5548 			.mode		= 0644,
5549 			.proc_handler	= proc_dointvec_ms_jiffies,
5550 		},
5551 		{
5552 			.procname	= "use_tempaddr",
5553 			.data		= &ipv6_devconf.use_tempaddr,
5554 			.maxlen		= sizeof(int),
5555 			.mode		= 0644,
5556 			.proc_handler	= proc_dointvec,
5557 		},
5558 		{
5559 			.procname	= "temp_valid_lft",
5560 			.data		= &ipv6_devconf.temp_valid_lft,
5561 			.maxlen		= sizeof(int),
5562 			.mode		= 0644,
5563 			.proc_handler	= proc_dointvec,
5564 		},
5565 		{
5566 			.procname	= "temp_prefered_lft",
5567 			.data		= &ipv6_devconf.temp_prefered_lft,
5568 			.maxlen		= sizeof(int),
5569 			.mode		= 0644,
5570 			.proc_handler	= proc_dointvec,
5571 		},
5572 		{
5573 			.procname	= "regen_max_retry",
5574 			.data		= &ipv6_devconf.regen_max_retry,
5575 			.maxlen		= sizeof(int),
5576 			.mode		= 0644,
5577 			.proc_handler	= proc_dointvec,
5578 		},
5579 		{
5580 			.procname	= "max_desync_factor",
5581 			.data		= &ipv6_devconf.max_desync_factor,
5582 			.maxlen		= sizeof(int),
5583 			.mode		= 0644,
5584 			.proc_handler	= proc_dointvec,
5585 		},
5586 		{
5587 			.procname	= "max_addresses",
5588 			.data		= &ipv6_devconf.max_addresses,
5589 			.maxlen		= sizeof(int),
5590 			.mode		= 0644,
5591 			.proc_handler	= proc_dointvec,
5592 		},
5593 		{
5594 			.procname	= "accept_ra_defrtr",
5595 			.data		= &ipv6_devconf.accept_ra_defrtr,
5596 			.maxlen		= sizeof(int),
5597 			.mode		= 0644,
5598 			.proc_handler	= proc_dointvec,
5599 		},
5600 		{
5601 			.procname	= "accept_ra_min_hop_limit",
5602 			.data		= &ipv6_devconf.accept_ra_min_hop_limit,
5603 			.maxlen		= sizeof(int),
5604 			.mode		= 0644,
5605 			.proc_handler	= proc_dointvec,
5606 		},
5607 		{
5608 			.procname	= "accept_ra_pinfo",
5609 			.data		= &ipv6_devconf.accept_ra_pinfo,
5610 			.maxlen		= sizeof(int),
5611 			.mode		= 0644,
5612 			.proc_handler	= proc_dointvec,
5613 		},
5614 #ifdef CONFIG_IPV6_ROUTER_PREF
5615 		{
5616 			.procname	= "accept_ra_rtr_pref",
5617 			.data		= &ipv6_devconf.accept_ra_rtr_pref,
5618 			.maxlen		= sizeof(int),
5619 			.mode		= 0644,
5620 			.proc_handler	= proc_dointvec,
5621 		},
5622 		{
5623 			.procname	= "router_probe_interval",
5624 			.data		= &ipv6_devconf.rtr_probe_interval,
5625 			.maxlen		= sizeof(int),
5626 			.mode		= 0644,
5627 			.proc_handler	= proc_dointvec_jiffies,
5628 		},
5629 #ifdef CONFIG_IPV6_ROUTE_INFO
5630 		{
5631 			.procname	= "accept_ra_rt_info_max_plen",
5632 			.data		= &ipv6_devconf.accept_ra_rt_info_max_plen,
5633 			.maxlen		= sizeof(int),
5634 			.mode		= 0644,
5635 			.proc_handler	= proc_dointvec,
5636 		},
5637 #endif
5638 #endif
5639 		{
5640 			.procname	= "proxy_ndp",
5641 			.data		= &ipv6_devconf.proxy_ndp,
5642 			.maxlen		= sizeof(int),
5643 			.mode		= 0644,
5644 			.proc_handler	= addrconf_sysctl_proxy_ndp,
5645 		},
5646 		{
5647 			.procname	= "accept_source_route",
5648 			.data		= &ipv6_devconf.accept_source_route,
5649 			.maxlen		= sizeof(int),
5650 			.mode		= 0644,
5651 			.proc_handler	= proc_dointvec,
5652 		},
5653 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5654 		{
5655 			.procname       = "optimistic_dad",
5656 			.data           = &ipv6_devconf.optimistic_dad,
5657 			.maxlen         = sizeof(int),
5658 			.mode           = 0644,
5659 			.proc_handler   = proc_dointvec,
5660 
5661 		},
5662 		{
5663 			.procname       = "use_optimistic",
5664 			.data           = &ipv6_devconf.use_optimistic,
5665 			.maxlen         = sizeof(int),
5666 			.mode           = 0644,
5667 			.proc_handler   = proc_dointvec,
5668 
5669 		},
5670 #endif
5671 #ifdef CONFIG_IPV6_MROUTE
5672 		{
5673 			.procname	= "mc_forwarding",
5674 			.data		= &ipv6_devconf.mc_forwarding,
5675 			.maxlen		= sizeof(int),
5676 			.mode		= 0444,
5677 			.proc_handler	= proc_dointvec,
5678 		},
5679 #endif
5680 		{
5681 			.procname	= "disable_ipv6",
5682 			.data		= &ipv6_devconf.disable_ipv6,
5683 			.maxlen		= sizeof(int),
5684 			.mode		= 0644,
5685 			.proc_handler	= addrconf_sysctl_disable,
5686 		},
5687 		{
5688 			.procname	= "accept_dad",
5689 			.data		= &ipv6_devconf.accept_dad,
5690 			.maxlen		= sizeof(int),
5691 			.mode		= 0644,
5692 			.proc_handler	= proc_dointvec,
5693 		},
5694 		{
5695 			.procname       = "force_tllao",
5696 			.data           = &ipv6_devconf.force_tllao,
5697 			.maxlen         = sizeof(int),
5698 			.mode           = 0644,
5699 			.proc_handler   = proc_dointvec
5700 		},
5701 		{
5702 			.procname       = "ndisc_notify",
5703 			.data           = &ipv6_devconf.ndisc_notify,
5704 			.maxlen         = sizeof(int),
5705 			.mode           = 0644,
5706 			.proc_handler   = proc_dointvec
5707 		},
5708 		{
5709 			.procname	= "suppress_frag_ndisc",
5710 			.data		= &ipv6_devconf.suppress_frag_ndisc,
5711 			.maxlen		= sizeof(int),
5712 			.mode		= 0644,
5713 			.proc_handler	= proc_dointvec
5714 		},
5715 		{
5716 			.procname	= "accept_ra_from_local",
5717 			.data		= &ipv6_devconf.accept_ra_from_local,
5718 			.maxlen		= sizeof(int),
5719 			.mode		= 0644,
5720 			.proc_handler	= proc_dointvec,
5721 		},
5722 		{
5723 			.procname	= "accept_ra_mtu",
5724 			.data		= &ipv6_devconf.accept_ra_mtu,
5725 			.maxlen		= sizeof(int),
5726 			.mode		= 0644,
5727 			.proc_handler	= proc_dointvec,
5728 		},
5729 		{
5730 			.procname	= "stable_secret",
5731 			.data		= &ipv6_devconf.stable_secret,
5732 			.maxlen		= IPV6_MAX_STRLEN,
5733 			.mode		= 0600,
5734 			.proc_handler	= addrconf_sysctl_stable_secret,
5735 		},
5736 		{
5737 			.procname       = "use_oif_addrs_only",
5738 			.data           = &ipv6_devconf.use_oif_addrs_only,
5739 			.maxlen         = sizeof(int),
5740 			.mode           = 0644,
5741 			.proc_handler   = proc_dointvec,
5742 		},
5743 		{
5744 			.procname	= "ignore_routes_with_linkdown",
5745 			.data		= &ipv6_devconf.ignore_routes_with_linkdown,
5746 			.maxlen		= sizeof(int),
5747 			.mode		= 0644,
5748 			.proc_handler	= addrconf_sysctl_ignore_routes_with_linkdown,
5749 		},
5750 		{
5751 			/* sentinel */
5752 		}
5753 	},
5754 };
5755 
5756 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
5757 		struct inet6_dev *idev, struct ipv6_devconf *p)
5758 {
5759 	int i;
5760 	struct addrconf_sysctl_table *t;
5761 	char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
5762 
5763 	t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
5764 	if (!t)
5765 		goto out;
5766 
5767 	for (i = 0; t->addrconf_vars[i].data; i++) {
5768 		t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
5769 		t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
5770 		t->addrconf_vars[i].extra2 = net;
5771 	}
5772 
5773 	snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
5774 
5775 	t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
5776 	if (!t->sysctl_header)
5777 		goto free;
5778 
5779 	p->sysctl = t;
5780 	return 0;
5781 
5782 free:
5783 	kfree(t);
5784 out:
5785 	return -ENOBUFS;
5786 }
5787 
5788 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
5789 {
5790 	struct addrconf_sysctl_table *t;
5791 
5792 	if (!p->sysctl)
5793 		return;
5794 
5795 	t = p->sysctl;
5796 	p->sysctl = NULL;
5797 	unregister_net_sysctl_table(t->sysctl_header);
5798 	kfree(t);
5799 }
5800 
5801 static int addrconf_sysctl_register(struct inet6_dev *idev)
5802 {
5803 	int err;
5804 
5805 	if (!sysctl_dev_name_is_allowed(idev->dev->name))
5806 		return -EINVAL;
5807 
5808 	err = neigh_sysctl_register(idev->dev, idev->nd_parms,
5809 				    &ndisc_ifinfo_sysctl_change);
5810 	if (err)
5811 		return err;
5812 	err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
5813 					 idev, &idev->cnf);
5814 	if (err)
5815 		neigh_sysctl_unregister(idev->nd_parms);
5816 
5817 	return err;
5818 }
5819 
5820 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
5821 {
5822 	__addrconf_sysctl_unregister(&idev->cnf);
5823 	neigh_sysctl_unregister(idev->nd_parms);
5824 }
5825 
5826 
5827 #endif
5828 
5829 static int __net_init addrconf_init_net(struct net *net)
5830 {
5831 	int err = -ENOMEM;
5832 	struct ipv6_devconf *all, *dflt;
5833 
5834 	all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
5835 	if (!all)
5836 		goto err_alloc_all;
5837 
5838 	dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
5839 	if (!dflt)
5840 		goto err_alloc_dflt;
5841 
5842 	/* these will be inherited by all namespaces */
5843 	dflt->autoconf = ipv6_defaults.autoconf;
5844 	dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
5845 
5846 	dflt->stable_secret.initialized = false;
5847 	all->stable_secret.initialized = false;
5848 
5849 	net->ipv6.devconf_all = all;
5850 	net->ipv6.devconf_dflt = dflt;
5851 
5852 #ifdef CONFIG_SYSCTL
5853 	err = __addrconf_sysctl_register(net, "all", NULL, all);
5854 	if (err < 0)
5855 		goto err_reg_all;
5856 
5857 	err = __addrconf_sysctl_register(net, "default", NULL, dflt);
5858 	if (err < 0)
5859 		goto err_reg_dflt;
5860 #endif
5861 	return 0;
5862 
5863 #ifdef CONFIG_SYSCTL
5864 err_reg_dflt:
5865 	__addrconf_sysctl_unregister(all);
5866 err_reg_all:
5867 	kfree(dflt);
5868 #endif
5869 err_alloc_dflt:
5870 	kfree(all);
5871 err_alloc_all:
5872 	return err;
5873 }
5874 
5875 static void __net_exit addrconf_exit_net(struct net *net)
5876 {
5877 #ifdef CONFIG_SYSCTL
5878 	__addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
5879 	__addrconf_sysctl_unregister(net->ipv6.devconf_all);
5880 #endif
5881 	kfree(net->ipv6.devconf_dflt);
5882 	kfree(net->ipv6.devconf_all);
5883 }
5884 
5885 static struct pernet_operations addrconf_ops = {
5886 	.init = addrconf_init_net,
5887 	.exit = addrconf_exit_net,
5888 };
5889 
5890 static struct rtnl_af_ops inet6_ops __read_mostly = {
5891 	.family		  = AF_INET6,
5892 	.fill_link_af	  = inet6_fill_link_af,
5893 	.get_link_af_size = inet6_get_link_af_size,
5894 	.validate_link_af = inet6_validate_link_af,
5895 	.set_link_af	  = inet6_set_link_af,
5896 };
5897 
5898 /*
5899  *	Init / cleanup code
5900  */
5901 
5902 int __init addrconf_init(void)
5903 {
5904 	struct inet6_dev *idev;
5905 	int i, err;
5906 
5907 	err = ipv6_addr_label_init();
5908 	if (err < 0) {
5909 		pr_crit("%s: cannot initialize default policy table: %d\n",
5910 			__func__, err);
5911 		goto out;
5912 	}
5913 
5914 	err = register_pernet_subsys(&addrconf_ops);
5915 	if (err < 0)
5916 		goto out_addrlabel;
5917 
5918 	addrconf_wq = create_workqueue("ipv6_addrconf");
5919 	if (!addrconf_wq) {
5920 		err = -ENOMEM;
5921 		goto out_nowq;
5922 	}
5923 
5924 	/* The addrconf netdev notifier requires that loopback_dev
5925 	 * has it's ipv6 private information allocated and setup
5926 	 * before it can bring up and give link-local addresses
5927 	 * to other devices which are up.
5928 	 *
5929 	 * Unfortunately, loopback_dev is not necessarily the first
5930 	 * entry in the global dev_base list of net devices.  In fact,
5931 	 * it is likely to be the very last entry on that list.
5932 	 * So this causes the notifier registry below to try and
5933 	 * give link-local addresses to all devices besides loopback_dev
5934 	 * first, then loopback_dev, which cases all the non-loopback_dev
5935 	 * devices to fail to get a link-local address.
5936 	 *
5937 	 * So, as a temporary fix, allocate the ipv6 structure for
5938 	 * loopback_dev first by hand.
5939 	 * Longer term, all of the dependencies ipv6 has upon the loopback
5940 	 * device and it being up should be removed.
5941 	 */
5942 	rtnl_lock();
5943 	idev = ipv6_add_dev(init_net.loopback_dev);
5944 	rtnl_unlock();
5945 	if (IS_ERR(idev)) {
5946 		err = PTR_ERR(idev);
5947 		goto errlo;
5948 	}
5949 
5950 	for (i = 0; i < IN6_ADDR_HSIZE; i++)
5951 		INIT_HLIST_HEAD(&inet6_addr_lst[i]);
5952 
5953 	register_netdevice_notifier(&ipv6_dev_notf);
5954 
5955 	addrconf_verify();
5956 
5957 	rtnl_af_register(&inet6_ops);
5958 
5959 	err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
5960 			      NULL);
5961 	if (err < 0)
5962 		goto errout;
5963 
5964 	/* Only the first call to __rtnl_register can fail */
5965 	__rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
5966 	__rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
5967 	__rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
5968 			inet6_dump_ifaddr, NULL);
5969 	__rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
5970 			inet6_dump_ifmcaddr, NULL);
5971 	__rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
5972 			inet6_dump_ifacaddr, NULL);
5973 	__rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
5974 			inet6_netconf_dump_devconf, NULL);
5975 
5976 	ipv6_addr_label_rtnl_register();
5977 
5978 	return 0;
5979 errout:
5980 	rtnl_af_unregister(&inet6_ops);
5981 	unregister_netdevice_notifier(&ipv6_dev_notf);
5982 errlo:
5983 	destroy_workqueue(addrconf_wq);
5984 out_nowq:
5985 	unregister_pernet_subsys(&addrconf_ops);
5986 out_addrlabel:
5987 	ipv6_addr_label_cleanup();
5988 out:
5989 	return err;
5990 }
5991 
5992 void addrconf_cleanup(void)
5993 {
5994 	struct net_device *dev;
5995 	int i;
5996 
5997 	unregister_netdevice_notifier(&ipv6_dev_notf);
5998 	unregister_pernet_subsys(&addrconf_ops);
5999 	ipv6_addr_label_cleanup();
6000 
6001 	rtnl_lock();
6002 
6003 	__rtnl_af_unregister(&inet6_ops);
6004 
6005 	/* clean dev list */
6006 	for_each_netdev(&init_net, dev) {
6007 		if (__in6_dev_get(dev) == NULL)
6008 			continue;
6009 		addrconf_ifdown(dev, 1);
6010 	}
6011 	addrconf_ifdown(init_net.loopback_dev, 2);
6012 
6013 	/*
6014 	 *	Check hash table.
6015 	 */
6016 	spin_lock_bh(&addrconf_hash_lock);
6017 	for (i = 0; i < IN6_ADDR_HSIZE; i++)
6018 		WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
6019 	spin_unlock_bh(&addrconf_hash_lock);
6020 	cancel_delayed_work(&addr_chk_work);
6021 	rtnl_unlock();
6022 
6023 	destroy_workqueue(addrconf_wq);
6024 }
6025