xref: /linux/net/ipv6/addrconf.c (revision 827634added7f38b7d724cab1dccdb2b004c13c3)
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/af_ieee802154.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 <linux/if_tunnel.h>
85 #include <linux/rtnetlink.h>
86 #include <linux/netconf.h>
87 #include <linux/random.h>
88 #include <linux/uaccess.h>
89 #include <asm/unaligned.h>
90 
91 #include <linux/proc_fs.h>
92 #include <linux/seq_file.h>
93 #include <linux/export.h>
94 
95 /* Set to 3 to get tracing... */
96 #define ACONF_DEBUG 2
97 
98 #if ACONF_DEBUG >= 3
99 #define ADBG(fmt, ...) printk(fmt, ##__VA_ARGS__)
100 #else
101 #define ADBG(fmt, ...) do { if (0) printk(fmt, ##__VA_ARGS__); } while (0)
102 #endif
103 
104 #define	INFINITY_LIFE_TIME	0xFFFFFFFF
105 
106 #define IPV6_MAX_STRLEN \
107 	sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")
108 
109 static inline u32 cstamp_delta(unsigned long cstamp)
110 {
111 	return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
112 }
113 
114 #ifdef CONFIG_SYSCTL
115 static int addrconf_sysctl_register(struct inet6_dev *idev);
116 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
117 #else
118 static inline int addrconf_sysctl_register(struct inet6_dev *idev)
119 {
120 	return 0;
121 }
122 
123 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
124 {
125 }
126 #endif
127 
128 static void __ipv6_regen_rndid(struct inet6_dev *idev);
129 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
130 static void ipv6_regen_rndid(unsigned long data);
131 
132 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
133 static int ipv6_count_addresses(struct inet6_dev *idev);
134 static int ipv6_generate_stable_address(struct in6_addr *addr,
135 					u8 dad_count,
136 					const struct inet6_dev *idev);
137 
138 /*
139  *	Configured unicast address hash table
140  */
141 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
142 static DEFINE_SPINLOCK(addrconf_hash_lock);
143 
144 static void addrconf_verify(void);
145 static void addrconf_verify_rtnl(void);
146 static void addrconf_verify_work(struct work_struct *);
147 
148 static struct workqueue_struct *addrconf_wq;
149 static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work);
150 
151 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
152 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
153 
154 static void addrconf_type_change(struct net_device *dev,
155 				 unsigned long event);
156 static int addrconf_ifdown(struct net_device *dev, int how);
157 
158 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
159 						  int plen,
160 						  const struct net_device *dev,
161 						  u32 flags, u32 noflags);
162 
163 static void addrconf_dad_start(struct inet6_ifaddr *ifp);
164 static void addrconf_dad_work(struct work_struct *w);
165 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
166 static void addrconf_dad_run(struct inet6_dev *idev);
167 static void addrconf_rs_timer(unsigned long data);
168 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
169 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
170 
171 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
172 				struct prefix_info *pinfo);
173 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
174 			       struct net_device *dev);
175 
176 static struct ipv6_devconf ipv6_devconf __read_mostly = {
177 	.forwarding		= 0,
178 	.hop_limit		= IPV6_DEFAULT_HOPLIMIT,
179 	.mtu6			= IPV6_MIN_MTU,
180 	.accept_ra		= 1,
181 	.accept_redirects	= 1,
182 	.autoconf		= 1,
183 	.force_mld_version	= 0,
184 	.mldv1_unsolicited_report_interval = 10 * HZ,
185 	.mldv2_unsolicited_report_interval = HZ,
186 	.dad_transmits		= 1,
187 	.rtr_solicits		= MAX_RTR_SOLICITATIONS,
188 	.rtr_solicit_interval	= RTR_SOLICITATION_INTERVAL,
189 	.rtr_solicit_delay	= MAX_RTR_SOLICITATION_DELAY,
190 	.use_tempaddr		= 0,
191 	.temp_valid_lft		= TEMP_VALID_LIFETIME,
192 	.temp_prefered_lft	= TEMP_PREFERRED_LIFETIME,
193 	.regen_max_retry	= REGEN_MAX_RETRY,
194 	.max_desync_factor	= MAX_DESYNC_FACTOR,
195 	.max_addresses		= IPV6_MAX_ADDRESSES,
196 	.accept_ra_defrtr	= 1,
197 	.accept_ra_from_local	= 0,
198 	.accept_ra_pinfo	= 1,
199 #ifdef CONFIG_IPV6_ROUTER_PREF
200 	.accept_ra_rtr_pref	= 1,
201 	.rtr_probe_interval	= 60 * HZ,
202 #ifdef CONFIG_IPV6_ROUTE_INFO
203 	.accept_ra_rt_info_max_plen = 0,
204 #endif
205 #endif
206 	.proxy_ndp		= 0,
207 	.accept_source_route	= 0,	/* we do not accept RH0 by default. */
208 	.disable_ipv6		= 0,
209 	.accept_dad		= 1,
210 	.suppress_frag_ndisc	= 1,
211 	.accept_ra_mtu		= 1,
212 	.stable_secret		= {
213 		.initialized = false,
214 	}
215 };
216 
217 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
218 	.forwarding		= 0,
219 	.hop_limit		= IPV6_DEFAULT_HOPLIMIT,
220 	.mtu6			= IPV6_MIN_MTU,
221 	.accept_ra		= 1,
222 	.accept_redirects	= 1,
223 	.autoconf		= 1,
224 	.force_mld_version	= 0,
225 	.mldv1_unsolicited_report_interval = 10 * HZ,
226 	.mldv2_unsolicited_report_interval = HZ,
227 	.dad_transmits		= 1,
228 	.rtr_solicits		= MAX_RTR_SOLICITATIONS,
229 	.rtr_solicit_interval	= RTR_SOLICITATION_INTERVAL,
230 	.rtr_solicit_delay	= MAX_RTR_SOLICITATION_DELAY,
231 	.use_tempaddr		= 0,
232 	.temp_valid_lft		= TEMP_VALID_LIFETIME,
233 	.temp_prefered_lft	= TEMP_PREFERRED_LIFETIME,
234 	.regen_max_retry	= REGEN_MAX_RETRY,
235 	.max_desync_factor	= MAX_DESYNC_FACTOR,
236 	.max_addresses		= IPV6_MAX_ADDRESSES,
237 	.accept_ra_defrtr	= 1,
238 	.accept_ra_from_local	= 0,
239 	.accept_ra_pinfo	= 1,
240 #ifdef CONFIG_IPV6_ROUTER_PREF
241 	.accept_ra_rtr_pref	= 1,
242 	.rtr_probe_interval	= 60 * HZ,
243 #ifdef CONFIG_IPV6_ROUTE_INFO
244 	.accept_ra_rt_info_max_plen = 0,
245 #endif
246 #endif
247 	.proxy_ndp		= 0,
248 	.accept_source_route	= 0,	/* we do not accept RH0 by default. */
249 	.disable_ipv6		= 0,
250 	.accept_dad		= 1,
251 	.suppress_frag_ndisc	= 1,
252 	.accept_ra_mtu		= 1,
253 	.stable_secret		= {
254 		.initialized = false,
255 	},
256 };
257 
258 /* Check if a valid qdisc is available */
259 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
260 {
261 	return !qdisc_tx_is_noop(dev);
262 }
263 
264 static void addrconf_del_rs_timer(struct inet6_dev *idev)
265 {
266 	if (del_timer(&idev->rs_timer))
267 		__in6_dev_put(idev);
268 }
269 
270 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
271 {
272 	if (cancel_delayed_work(&ifp->dad_work))
273 		__in6_ifa_put(ifp);
274 }
275 
276 static void addrconf_mod_rs_timer(struct inet6_dev *idev,
277 				  unsigned long when)
278 {
279 	if (!timer_pending(&idev->rs_timer))
280 		in6_dev_hold(idev);
281 	mod_timer(&idev->rs_timer, jiffies + when);
282 }
283 
284 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
285 				   unsigned long delay)
286 {
287 	if (!delayed_work_pending(&ifp->dad_work))
288 		in6_ifa_hold(ifp);
289 	mod_delayed_work(addrconf_wq, &ifp->dad_work, delay);
290 }
291 
292 static int snmp6_alloc_dev(struct inet6_dev *idev)
293 {
294 	int i;
295 
296 	idev->stats.ipv6 = alloc_percpu(struct ipstats_mib);
297 	if (!idev->stats.ipv6)
298 		goto err_ip;
299 
300 	for_each_possible_cpu(i) {
301 		struct ipstats_mib *addrconf_stats;
302 		addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
303 		u64_stats_init(&addrconf_stats->syncp);
304 	}
305 
306 
307 	idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
308 					GFP_KERNEL);
309 	if (!idev->stats.icmpv6dev)
310 		goto err_icmp;
311 	idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
312 					   GFP_KERNEL);
313 	if (!idev->stats.icmpv6msgdev)
314 		goto err_icmpmsg;
315 
316 	return 0;
317 
318 err_icmpmsg:
319 	kfree(idev->stats.icmpv6dev);
320 err_icmp:
321 	free_percpu(idev->stats.ipv6);
322 err_ip:
323 	return -ENOMEM;
324 }
325 
326 static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
327 {
328 	struct inet6_dev *ndev;
329 	int err = -ENOMEM;
330 
331 	ASSERT_RTNL();
332 
333 	if (dev->mtu < IPV6_MIN_MTU)
334 		return ERR_PTR(-EINVAL);
335 
336 	ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
337 	if (!ndev)
338 		return ERR_PTR(err);
339 
340 	rwlock_init(&ndev->lock);
341 	ndev->dev = dev;
342 	INIT_LIST_HEAD(&ndev->addr_list);
343 	setup_timer(&ndev->rs_timer, addrconf_rs_timer,
344 		    (unsigned long)ndev);
345 	memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
346 	ndev->cnf.mtu6 = dev->mtu;
347 	ndev->cnf.sysctl = NULL;
348 	ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
349 	if (!ndev->nd_parms) {
350 		kfree(ndev);
351 		return ERR_PTR(err);
352 	}
353 	if (ndev->cnf.forwarding)
354 		dev_disable_lro(dev);
355 	/* We refer to the device */
356 	dev_hold(dev);
357 
358 	if (snmp6_alloc_dev(ndev) < 0) {
359 		ADBG(KERN_WARNING
360 			"%s: cannot allocate memory for statistics; dev=%s.\n",
361 			__func__, dev->name);
362 		neigh_parms_release(&nd_tbl, ndev->nd_parms);
363 		dev_put(dev);
364 		kfree(ndev);
365 		return ERR_PTR(err);
366 	}
367 
368 	if (snmp6_register_dev(ndev) < 0) {
369 		ADBG(KERN_WARNING
370 			"%s: cannot create /proc/net/dev_snmp6/%s\n",
371 			__func__, dev->name);
372 		goto err_release;
373 	}
374 
375 	/* One reference from device.  We must do this before
376 	 * we invoke __ipv6_regen_rndid().
377 	 */
378 	in6_dev_hold(ndev);
379 
380 	if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
381 		ndev->cnf.accept_dad = -1;
382 
383 #if IS_ENABLED(CONFIG_IPV6_SIT)
384 	if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
385 		pr_info("%s: Disabled Multicast RS\n", dev->name);
386 		ndev->cnf.rtr_solicits = 0;
387 	}
388 #endif
389 
390 	INIT_LIST_HEAD(&ndev->tempaddr_list);
391 	setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
392 	if ((dev->flags&IFF_LOOPBACK) ||
393 	    dev->type == ARPHRD_TUNNEL ||
394 	    dev->type == ARPHRD_TUNNEL6 ||
395 	    dev->type == ARPHRD_SIT ||
396 	    dev->type == ARPHRD_NONE) {
397 		ndev->cnf.use_tempaddr = -1;
398 	} else {
399 		in6_dev_hold(ndev);
400 		ipv6_regen_rndid((unsigned long) ndev);
401 	}
402 
403 	ndev->token = in6addr_any;
404 
405 	if (netif_running(dev) && addrconf_qdisc_ok(dev))
406 		ndev->if_flags |= IF_READY;
407 
408 	ipv6_mc_init_dev(ndev);
409 	ndev->tstamp = jiffies;
410 	err = addrconf_sysctl_register(ndev);
411 	if (err) {
412 		ipv6_mc_destroy_dev(ndev);
413 		del_timer(&ndev->regen_timer);
414 		goto err_release;
415 	}
416 	/* protected by rtnl_lock */
417 	rcu_assign_pointer(dev->ip6_ptr, ndev);
418 
419 	/* Join interface-local all-node multicast group */
420 	ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
421 
422 	/* Join all-node multicast group */
423 	ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
424 
425 	/* Join all-router multicast group if forwarding is set */
426 	if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
427 		ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
428 
429 	return ndev;
430 
431 err_release:
432 	neigh_parms_release(&nd_tbl, ndev->nd_parms);
433 	ndev->dead = 1;
434 	in6_dev_finish_destroy(ndev);
435 	return ERR_PTR(err);
436 }
437 
438 static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
439 {
440 	struct inet6_dev *idev;
441 
442 	ASSERT_RTNL();
443 
444 	idev = __in6_dev_get(dev);
445 	if (!idev) {
446 		idev = ipv6_add_dev(dev);
447 		if (IS_ERR(idev))
448 			return NULL;
449 	}
450 
451 	if (dev->flags&IFF_UP)
452 		ipv6_mc_up(idev);
453 	return idev;
454 }
455 
456 static int inet6_netconf_msgsize_devconf(int type)
457 {
458 	int size =  NLMSG_ALIGN(sizeof(struct netconfmsg))
459 		    + nla_total_size(4);	/* NETCONFA_IFINDEX */
460 
461 	/* type -1 is used for ALL */
462 	if (type == -1 || type == NETCONFA_FORWARDING)
463 		size += nla_total_size(4);
464 #ifdef CONFIG_IPV6_MROUTE
465 	if (type == -1 || type == NETCONFA_MC_FORWARDING)
466 		size += nla_total_size(4);
467 #endif
468 	if (type == -1 || type == NETCONFA_PROXY_NEIGH)
469 		size += nla_total_size(4);
470 
471 	return size;
472 }
473 
474 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
475 				      struct ipv6_devconf *devconf, u32 portid,
476 				      u32 seq, int event, unsigned int flags,
477 				      int type)
478 {
479 	struct nlmsghdr  *nlh;
480 	struct netconfmsg *ncm;
481 
482 	nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
483 			flags);
484 	if (!nlh)
485 		return -EMSGSIZE;
486 
487 	ncm = nlmsg_data(nlh);
488 	ncm->ncm_family = AF_INET6;
489 
490 	if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
491 		goto nla_put_failure;
492 
493 	/* type -1 is used for ALL */
494 	if ((type == -1 || type == NETCONFA_FORWARDING) &&
495 	    nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
496 		goto nla_put_failure;
497 #ifdef CONFIG_IPV6_MROUTE
498 	if ((type == -1 || type == NETCONFA_MC_FORWARDING) &&
499 	    nla_put_s32(skb, NETCONFA_MC_FORWARDING,
500 			devconf->mc_forwarding) < 0)
501 		goto nla_put_failure;
502 #endif
503 	if ((type == -1 || type == NETCONFA_PROXY_NEIGH) &&
504 	    nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
505 		goto nla_put_failure;
506 
507 	nlmsg_end(skb, nlh);
508 	return 0;
509 
510 nla_put_failure:
511 	nlmsg_cancel(skb, nlh);
512 	return -EMSGSIZE;
513 }
514 
515 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
516 				  struct ipv6_devconf *devconf)
517 {
518 	struct sk_buff *skb;
519 	int err = -ENOBUFS;
520 
521 	skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC);
522 	if (!skb)
523 		goto errout;
524 
525 	err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
526 					 RTM_NEWNETCONF, 0, type);
527 	if (err < 0) {
528 		/* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
529 		WARN_ON(err == -EMSGSIZE);
530 		kfree_skb(skb);
531 		goto errout;
532 	}
533 	rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC);
534 	return;
535 errout:
536 	rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
537 }
538 
539 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
540 	[NETCONFA_IFINDEX]	= { .len = sizeof(int) },
541 	[NETCONFA_FORWARDING]	= { .len = sizeof(int) },
542 	[NETCONFA_PROXY_NEIGH]	= { .len = sizeof(int) },
543 };
544 
545 static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
546 				     struct nlmsghdr *nlh)
547 {
548 	struct net *net = sock_net(in_skb->sk);
549 	struct nlattr *tb[NETCONFA_MAX+1];
550 	struct netconfmsg *ncm;
551 	struct sk_buff *skb;
552 	struct ipv6_devconf *devconf;
553 	struct inet6_dev *in6_dev;
554 	struct net_device *dev;
555 	int ifindex;
556 	int err;
557 
558 	err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
559 			  devconf_ipv6_policy);
560 	if (err < 0)
561 		goto errout;
562 
563 	err = EINVAL;
564 	if (!tb[NETCONFA_IFINDEX])
565 		goto errout;
566 
567 	ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
568 	switch (ifindex) {
569 	case NETCONFA_IFINDEX_ALL:
570 		devconf = net->ipv6.devconf_all;
571 		break;
572 	case NETCONFA_IFINDEX_DEFAULT:
573 		devconf = net->ipv6.devconf_dflt;
574 		break;
575 	default:
576 		dev = __dev_get_by_index(net, ifindex);
577 		if (!dev)
578 			goto errout;
579 		in6_dev = __in6_dev_get(dev);
580 		if (!in6_dev)
581 			goto errout;
582 		devconf = &in6_dev->cnf;
583 		break;
584 	}
585 
586 	err = -ENOBUFS;
587 	skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC);
588 	if (!skb)
589 		goto errout;
590 
591 	err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
592 					 NETLINK_CB(in_skb).portid,
593 					 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
594 					 -1);
595 	if (err < 0) {
596 		/* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
597 		WARN_ON(err == -EMSGSIZE);
598 		kfree_skb(skb);
599 		goto errout;
600 	}
601 	err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
602 errout:
603 	return err;
604 }
605 
606 static int inet6_netconf_dump_devconf(struct sk_buff *skb,
607 				      struct netlink_callback *cb)
608 {
609 	struct net *net = sock_net(skb->sk);
610 	int h, s_h;
611 	int idx, s_idx;
612 	struct net_device *dev;
613 	struct inet6_dev *idev;
614 	struct hlist_head *head;
615 
616 	s_h = cb->args[0];
617 	s_idx = idx = cb->args[1];
618 
619 	for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
620 		idx = 0;
621 		head = &net->dev_index_head[h];
622 		rcu_read_lock();
623 		cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
624 			  net->dev_base_seq;
625 		hlist_for_each_entry_rcu(dev, head, index_hlist) {
626 			if (idx < s_idx)
627 				goto cont;
628 			idev = __in6_dev_get(dev);
629 			if (!idev)
630 				goto cont;
631 
632 			if (inet6_netconf_fill_devconf(skb, dev->ifindex,
633 						       &idev->cnf,
634 						       NETLINK_CB(cb->skb).portid,
635 						       cb->nlh->nlmsg_seq,
636 						       RTM_NEWNETCONF,
637 						       NLM_F_MULTI,
638 						       -1) < 0) {
639 				rcu_read_unlock();
640 				goto done;
641 			}
642 			nl_dump_check_consistent(cb, nlmsg_hdr(skb));
643 cont:
644 			idx++;
645 		}
646 		rcu_read_unlock();
647 	}
648 	if (h == NETDEV_HASHENTRIES) {
649 		if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
650 					       net->ipv6.devconf_all,
651 					       NETLINK_CB(cb->skb).portid,
652 					       cb->nlh->nlmsg_seq,
653 					       RTM_NEWNETCONF, NLM_F_MULTI,
654 					       -1) < 0)
655 			goto done;
656 		else
657 			h++;
658 	}
659 	if (h == NETDEV_HASHENTRIES + 1) {
660 		if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
661 					       net->ipv6.devconf_dflt,
662 					       NETLINK_CB(cb->skb).portid,
663 					       cb->nlh->nlmsg_seq,
664 					       RTM_NEWNETCONF, NLM_F_MULTI,
665 					       -1) < 0)
666 			goto done;
667 		else
668 			h++;
669 	}
670 done:
671 	cb->args[0] = h;
672 	cb->args[1] = idx;
673 
674 	return skb->len;
675 }
676 
677 #ifdef CONFIG_SYSCTL
678 static void dev_forward_change(struct inet6_dev *idev)
679 {
680 	struct net_device *dev;
681 	struct inet6_ifaddr *ifa;
682 
683 	if (!idev)
684 		return;
685 	dev = idev->dev;
686 	if (idev->cnf.forwarding)
687 		dev_disable_lro(dev);
688 	if (dev->flags & IFF_MULTICAST) {
689 		if (idev->cnf.forwarding) {
690 			ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
691 			ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
692 			ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
693 		} else {
694 			ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
695 			ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
696 			ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
697 		}
698 	}
699 
700 	list_for_each_entry(ifa, &idev->addr_list, if_list) {
701 		if (ifa->flags&IFA_F_TENTATIVE)
702 			continue;
703 		if (idev->cnf.forwarding)
704 			addrconf_join_anycast(ifa);
705 		else
706 			addrconf_leave_anycast(ifa);
707 	}
708 	inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
709 				     dev->ifindex, &idev->cnf);
710 }
711 
712 
713 static void addrconf_forward_change(struct net *net, __s32 newf)
714 {
715 	struct net_device *dev;
716 	struct inet6_dev *idev;
717 
718 	for_each_netdev(net, dev) {
719 		idev = __in6_dev_get(dev);
720 		if (idev) {
721 			int changed = (!idev->cnf.forwarding) ^ (!newf);
722 			idev->cnf.forwarding = newf;
723 			if (changed)
724 				dev_forward_change(idev);
725 		}
726 	}
727 }
728 
729 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
730 {
731 	struct net *net;
732 	int old;
733 
734 	if (!rtnl_trylock())
735 		return restart_syscall();
736 
737 	net = (struct net *)table->extra2;
738 	old = *p;
739 	*p = newf;
740 
741 	if (p == &net->ipv6.devconf_dflt->forwarding) {
742 		if ((!newf) ^ (!old))
743 			inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
744 						     NETCONFA_IFINDEX_DEFAULT,
745 						     net->ipv6.devconf_dflt);
746 		rtnl_unlock();
747 		return 0;
748 	}
749 
750 	if (p == &net->ipv6.devconf_all->forwarding) {
751 		net->ipv6.devconf_dflt->forwarding = newf;
752 		addrconf_forward_change(net, newf);
753 		if ((!newf) ^ (!old))
754 			inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
755 						     NETCONFA_IFINDEX_ALL,
756 						     net->ipv6.devconf_all);
757 	} else if ((!newf) ^ (!old))
758 		dev_forward_change((struct inet6_dev *)table->extra1);
759 	rtnl_unlock();
760 
761 	if (newf)
762 		rt6_purge_dflt_routers(net);
763 	return 1;
764 }
765 #endif
766 
767 /* Nobody refers to this ifaddr, destroy it */
768 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
769 {
770 	WARN_ON(!hlist_unhashed(&ifp->addr_lst));
771 
772 #ifdef NET_REFCNT_DEBUG
773 	pr_debug("%s\n", __func__);
774 #endif
775 
776 	in6_dev_put(ifp->idev);
777 
778 	if (cancel_delayed_work(&ifp->dad_work))
779 		pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
780 			  ifp);
781 
782 	if (ifp->state != INET6_IFADDR_STATE_DEAD) {
783 		pr_warn("Freeing alive inet6 address %p\n", ifp);
784 		return;
785 	}
786 	ip6_rt_put(ifp->rt);
787 
788 	kfree_rcu(ifp, rcu);
789 }
790 
791 static void
792 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
793 {
794 	struct list_head *p;
795 	int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
796 
797 	/*
798 	 * Each device address list is sorted in order of scope -
799 	 * global before linklocal.
800 	 */
801 	list_for_each(p, &idev->addr_list) {
802 		struct inet6_ifaddr *ifa
803 			= list_entry(p, struct inet6_ifaddr, if_list);
804 		if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
805 			break;
806 	}
807 
808 	list_add_tail(&ifp->if_list, p);
809 }
810 
811 static u32 inet6_addr_hash(const struct in6_addr *addr)
812 {
813 	return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
814 }
815 
816 /* On success it returns ifp with increased reference count */
817 
818 static struct inet6_ifaddr *
819 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
820 	      const struct in6_addr *peer_addr, int pfxlen,
821 	      int scope, u32 flags, u32 valid_lft, u32 prefered_lft)
822 {
823 	struct inet6_ifaddr *ifa = NULL;
824 	struct rt6_info *rt;
825 	unsigned int hash;
826 	int err = 0;
827 	int addr_type = ipv6_addr_type(addr);
828 
829 	if (addr_type == IPV6_ADDR_ANY ||
830 	    addr_type & IPV6_ADDR_MULTICAST ||
831 	    (!(idev->dev->flags & IFF_LOOPBACK) &&
832 	     addr_type & IPV6_ADDR_LOOPBACK))
833 		return ERR_PTR(-EADDRNOTAVAIL);
834 
835 	rcu_read_lock_bh();
836 	if (idev->dead) {
837 		err = -ENODEV;			/*XXX*/
838 		goto out2;
839 	}
840 
841 	if (idev->cnf.disable_ipv6) {
842 		err = -EACCES;
843 		goto out2;
844 	}
845 
846 	spin_lock(&addrconf_hash_lock);
847 
848 	/* Ignore adding duplicate addresses on an interface */
849 	if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
850 		ADBG("ipv6_add_addr: already assigned\n");
851 		err = -EEXIST;
852 		goto out;
853 	}
854 
855 	ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
856 
857 	if (!ifa) {
858 		ADBG("ipv6_add_addr: malloc failed\n");
859 		err = -ENOBUFS;
860 		goto out;
861 	}
862 
863 	rt = addrconf_dst_alloc(idev, addr, false);
864 	if (IS_ERR(rt)) {
865 		err = PTR_ERR(rt);
866 		goto out;
867 	}
868 
869 	neigh_parms_data_state_setall(idev->nd_parms);
870 
871 	ifa->addr = *addr;
872 	if (peer_addr)
873 		ifa->peer_addr = *peer_addr;
874 
875 	spin_lock_init(&ifa->lock);
876 	INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
877 	INIT_HLIST_NODE(&ifa->addr_lst);
878 	ifa->scope = scope;
879 	ifa->prefix_len = pfxlen;
880 	ifa->flags = flags | IFA_F_TENTATIVE;
881 	ifa->valid_lft = valid_lft;
882 	ifa->prefered_lft = prefered_lft;
883 	ifa->cstamp = ifa->tstamp = jiffies;
884 	ifa->tokenized = false;
885 
886 	ifa->rt = rt;
887 
888 	ifa->idev = idev;
889 	in6_dev_hold(idev);
890 	/* For caller */
891 	in6_ifa_hold(ifa);
892 
893 	/* Add to big hash table */
894 	hash = inet6_addr_hash(addr);
895 
896 	hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
897 	spin_unlock(&addrconf_hash_lock);
898 
899 	write_lock(&idev->lock);
900 	/* Add to inet6_dev unicast addr list. */
901 	ipv6_link_dev_addr(idev, ifa);
902 
903 	if (ifa->flags&IFA_F_TEMPORARY) {
904 		list_add(&ifa->tmp_list, &idev->tempaddr_list);
905 		in6_ifa_hold(ifa);
906 	}
907 
908 	in6_ifa_hold(ifa);
909 	write_unlock(&idev->lock);
910 out2:
911 	rcu_read_unlock_bh();
912 
913 	if (likely(err == 0))
914 		inet6addr_notifier_call_chain(NETDEV_UP, ifa);
915 	else {
916 		kfree(ifa);
917 		ifa = ERR_PTR(err);
918 	}
919 
920 	return ifa;
921 out:
922 	spin_unlock(&addrconf_hash_lock);
923 	goto out2;
924 }
925 
926 enum cleanup_prefix_rt_t {
927 	CLEANUP_PREFIX_RT_NOP,    /* no cleanup action for prefix route */
928 	CLEANUP_PREFIX_RT_DEL,    /* delete the prefix route */
929 	CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
930 };
931 
932 /*
933  * Check, whether the prefix for ifp would still need a prefix route
934  * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
935  * constants.
936  *
937  * 1) we don't purge prefix if address was not permanent.
938  *    prefix is managed by its own lifetime.
939  * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
940  * 3) if there are no addresses, delete prefix.
941  * 4) if there are still other permanent address(es),
942  *    corresponding prefix is still permanent.
943  * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
944  *    don't purge the prefix, assume user space is managing it.
945  * 6) otherwise, update prefix lifetime to the
946  *    longest valid lifetime among the corresponding
947  *    addresses on the device.
948  *    Note: subsequent RA will update lifetime.
949  **/
950 static enum cleanup_prefix_rt_t
951 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
952 {
953 	struct inet6_ifaddr *ifa;
954 	struct inet6_dev *idev = ifp->idev;
955 	unsigned long lifetime;
956 	enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
957 
958 	*expires = jiffies;
959 
960 	list_for_each_entry(ifa, &idev->addr_list, if_list) {
961 		if (ifa == ifp)
962 			continue;
963 		if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr,
964 				       ifp->prefix_len))
965 			continue;
966 		if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
967 			return CLEANUP_PREFIX_RT_NOP;
968 
969 		action = CLEANUP_PREFIX_RT_EXPIRE;
970 
971 		spin_lock(&ifa->lock);
972 
973 		lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
974 		/*
975 		 * Note: Because this address is
976 		 * not permanent, lifetime <
977 		 * LONG_MAX / HZ here.
978 		 */
979 		if (time_before(*expires, ifa->tstamp + lifetime * HZ))
980 			*expires = ifa->tstamp + lifetime * HZ;
981 		spin_unlock(&ifa->lock);
982 	}
983 
984 	return action;
985 }
986 
987 static void
988 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
989 {
990 	struct rt6_info *rt;
991 
992 	rt = addrconf_get_prefix_route(&ifp->addr,
993 				       ifp->prefix_len,
994 				       ifp->idev->dev,
995 				       0, RTF_GATEWAY | RTF_DEFAULT);
996 	if (rt) {
997 		if (del_rt)
998 			ip6_del_rt(rt);
999 		else {
1000 			if (!(rt->rt6i_flags & RTF_EXPIRES))
1001 				rt6_set_expires(rt, expires);
1002 			ip6_rt_put(rt);
1003 		}
1004 	}
1005 }
1006 
1007 
1008 /* This function wants to get referenced ifp and releases it before return */
1009 
1010 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1011 {
1012 	int state;
1013 	enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1014 	unsigned long expires;
1015 
1016 	ASSERT_RTNL();
1017 
1018 	spin_lock_bh(&ifp->lock);
1019 	state = ifp->state;
1020 	ifp->state = INET6_IFADDR_STATE_DEAD;
1021 	spin_unlock_bh(&ifp->lock);
1022 
1023 	if (state == INET6_IFADDR_STATE_DEAD)
1024 		goto out;
1025 
1026 	spin_lock_bh(&addrconf_hash_lock);
1027 	hlist_del_init_rcu(&ifp->addr_lst);
1028 	spin_unlock_bh(&addrconf_hash_lock);
1029 
1030 	write_lock_bh(&ifp->idev->lock);
1031 
1032 	if (ifp->flags&IFA_F_TEMPORARY) {
1033 		list_del(&ifp->tmp_list);
1034 		if (ifp->ifpub) {
1035 			in6_ifa_put(ifp->ifpub);
1036 			ifp->ifpub = NULL;
1037 		}
1038 		__in6_ifa_put(ifp);
1039 	}
1040 
1041 	if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1042 		action = check_cleanup_prefix_route(ifp, &expires);
1043 
1044 	list_del_init(&ifp->if_list);
1045 	__in6_ifa_put(ifp);
1046 
1047 	write_unlock_bh(&ifp->idev->lock);
1048 
1049 	addrconf_del_dad_work(ifp);
1050 
1051 	ipv6_ifa_notify(RTM_DELADDR, ifp);
1052 
1053 	inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1054 
1055 	if (action != CLEANUP_PREFIX_RT_NOP) {
1056 		cleanup_prefix_route(ifp, expires,
1057 			action == CLEANUP_PREFIX_RT_DEL);
1058 	}
1059 
1060 	/* clean up prefsrc entries */
1061 	rt6_remove_prefsrc(ifp);
1062 out:
1063 	in6_ifa_put(ifp);
1064 }
1065 
1066 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1067 {
1068 	struct inet6_dev *idev = ifp->idev;
1069 	struct in6_addr addr, *tmpaddr;
1070 	unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
1071 	unsigned long regen_advance;
1072 	int tmp_plen;
1073 	int ret = 0;
1074 	u32 addr_flags;
1075 	unsigned long now = jiffies;
1076 
1077 	write_lock_bh(&idev->lock);
1078 	if (ift) {
1079 		spin_lock_bh(&ift->lock);
1080 		memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1081 		spin_unlock_bh(&ift->lock);
1082 		tmpaddr = &addr;
1083 	} else {
1084 		tmpaddr = NULL;
1085 	}
1086 retry:
1087 	in6_dev_hold(idev);
1088 	if (idev->cnf.use_tempaddr <= 0) {
1089 		write_unlock_bh(&idev->lock);
1090 		pr_info("%s: use_tempaddr is disabled\n", __func__);
1091 		in6_dev_put(idev);
1092 		ret = -1;
1093 		goto out;
1094 	}
1095 	spin_lock_bh(&ifp->lock);
1096 	if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1097 		idev->cnf.use_tempaddr = -1;	/*XXX*/
1098 		spin_unlock_bh(&ifp->lock);
1099 		write_unlock_bh(&idev->lock);
1100 		pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1101 			__func__);
1102 		in6_dev_put(idev);
1103 		ret = -1;
1104 		goto out;
1105 	}
1106 	in6_ifa_hold(ifp);
1107 	memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1108 	__ipv6_try_regen_rndid(idev, tmpaddr);
1109 	memcpy(&addr.s6_addr[8], idev->rndid, 8);
1110 	age = (now - ifp->tstamp) / HZ;
1111 	tmp_valid_lft = min_t(__u32,
1112 			      ifp->valid_lft,
1113 			      idev->cnf.temp_valid_lft + age);
1114 	tmp_prefered_lft = min_t(__u32,
1115 				 ifp->prefered_lft,
1116 				 idev->cnf.temp_prefered_lft + age -
1117 				 idev->cnf.max_desync_factor);
1118 	tmp_plen = ifp->prefix_len;
1119 	tmp_tstamp = ifp->tstamp;
1120 	spin_unlock_bh(&ifp->lock);
1121 
1122 	regen_advance = idev->cnf.regen_max_retry *
1123 			idev->cnf.dad_transmits *
1124 			NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
1125 	write_unlock_bh(&idev->lock);
1126 
1127 	/* A temporary address is created only if this calculated Preferred
1128 	 * Lifetime is greater than REGEN_ADVANCE time units.  In particular,
1129 	 * an implementation must not create a temporary address with a zero
1130 	 * Preferred Lifetime.
1131 	 * Use age calculation as in addrconf_verify to avoid unnecessary
1132 	 * temporary addresses being generated.
1133 	 */
1134 	age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1135 	if (tmp_prefered_lft <= regen_advance + age) {
1136 		in6_ifa_put(ifp);
1137 		in6_dev_put(idev);
1138 		ret = -1;
1139 		goto out;
1140 	}
1141 
1142 	addr_flags = IFA_F_TEMPORARY;
1143 	/* set in addrconf_prefix_rcv() */
1144 	if (ifp->flags & IFA_F_OPTIMISTIC)
1145 		addr_flags |= IFA_F_OPTIMISTIC;
1146 
1147 	ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1148 			    ipv6_addr_scope(&addr), addr_flags,
1149 			    tmp_valid_lft, tmp_prefered_lft);
1150 	if (IS_ERR(ift)) {
1151 		in6_ifa_put(ifp);
1152 		in6_dev_put(idev);
1153 		pr_info("%s: retry temporary address regeneration\n", __func__);
1154 		tmpaddr = &addr;
1155 		write_lock_bh(&idev->lock);
1156 		goto retry;
1157 	}
1158 
1159 	spin_lock_bh(&ift->lock);
1160 	ift->ifpub = ifp;
1161 	ift->cstamp = now;
1162 	ift->tstamp = tmp_tstamp;
1163 	spin_unlock_bh(&ift->lock);
1164 
1165 	addrconf_dad_start(ift);
1166 	in6_ifa_put(ift);
1167 	in6_dev_put(idev);
1168 out:
1169 	return ret;
1170 }
1171 
1172 /*
1173  *	Choose an appropriate source address (RFC3484)
1174  */
1175 enum {
1176 	IPV6_SADDR_RULE_INIT = 0,
1177 	IPV6_SADDR_RULE_LOCAL,
1178 	IPV6_SADDR_RULE_SCOPE,
1179 	IPV6_SADDR_RULE_PREFERRED,
1180 #ifdef CONFIG_IPV6_MIP6
1181 	IPV6_SADDR_RULE_HOA,
1182 #endif
1183 	IPV6_SADDR_RULE_OIF,
1184 	IPV6_SADDR_RULE_LABEL,
1185 	IPV6_SADDR_RULE_PRIVACY,
1186 	IPV6_SADDR_RULE_ORCHID,
1187 	IPV6_SADDR_RULE_PREFIX,
1188 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1189 	IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1190 #endif
1191 	IPV6_SADDR_RULE_MAX
1192 };
1193 
1194 struct ipv6_saddr_score {
1195 	int			rule;
1196 	int			addr_type;
1197 	struct inet6_ifaddr	*ifa;
1198 	DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1199 	int			scopedist;
1200 	int			matchlen;
1201 };
1202 
1203 struct ipv6_saddr_dst {
1204 	const struct in6_addr *addr;
1205 	int ifindex;
1206 	int scope;
1207 	int label;
1208 	unsigned int prefs;
1209 };
1210 
1211 static inline int ipv6_saddr_preferred(int type)
1212 {
1213 	if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1214 		return 1;
1215 	return 0;
1216 }
1217 
1218 static inline bool ipv6_use_optimistic_addr(struct inet6_dev *idev)
1219 {
1220 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1221 	return idev && idev->cnf.optimistic_dad && idev->cnf.use_optimistic;
1222 #else
1223 	return false;
1224 #endif
1225 }
1226 
1227 static int ipv6_get_saddr_eval(struct net *net,
1228 			       struct ipv6_saddr_score *score,
1229 			       struct ipv6_saddr_dst *dst,
1230 			       int i)
1231 {
1232 	int ret;
1233 
1234 	if (i <= score->rule) {
1235 		switch (i) {
1236 		case IPV6_SADDR_RULE_SCOPE:
1237 			ret = score->scopedist;
1238 			break;
1239 		case IPV6_SADDR_RULE_PREFIX:
1240 			ret = score->matchlen;
1241 			break;
1242 		default:
1243 			ret = !!test_bit(i, score->scorebits);
1244 		}
1245 		goto out;
1246 	}
1247 
1248 	switch (i) {
1249 	case IPV6_SADDR_RULE_INIT:
1250 		/* Rule 0: remember if hiscore is not ready yet */
1251 		ret = !!score->ifa;
1252 		break;
1253 	case IPV6_SADDR_RULE_LOCAL:
1254 		/* Rule 1: Prefer same address */
1255 		ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1256 		break;
1257 	case IPV6_SADDR_RULE_SCOPE:
1258 		/* Rule 2: Prefer appropriate scope
1259 		 *
1260 		 *      ret
1261 		 *       ^
1262 		 *    -1 |  d 15
1263 		 *    ---+--+-+---> scope
1264 		 *       |
1265 		 *       |             d is scope of the destination.
1266 		 *  B-d  |  \
1267 		 *       |   \      <- smaller scope is better if
1268 		 *  B-15 |    \        if scope is enough for destination.
1269 		 *       |             ret = B - scope (-1 <= scope >= d <= 15).
1270 		 * d-C-1 | /
1271 		 *       |/         <- greater is better
1272 		 *   -C  /             if scope is not enough for destination.
1273 		 *      /|             ret = scope - C (-1 <= d < scope <= 15).
1274 		 *
1275 		 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1276 		 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1277 		 * Assume B = 0 and we get C > 29.
1278 		 */
1279 		ret = __ipv6_addr_src_scope(score->addr_type);
1280 		if (ret >= dst->scope)
1281 			ret = -ret;
1282 		else
1283 			ret -= 128;	/* 30 is enough */
1284 		score->scopedist = ret;
1285 		break;
1286 	case IPV6_SADDR_RULE_PREFERRED:
1287 	    {
1288 		/* Rule 3: Avoid deprecated and optimistic addresses */
1289 		u8 avoid = IFA_F_DEPRECATED;
1290 
1291 		if (!ipv6_use_optimistic_addr(score->ifa->idev))
1292 			avoid |= IFA_F_OPTIMISTIC;
1293 		ret = ipv6_saddr_preferred(score->addr_type) ||
1294 		      !(score->ifa->flags & avoid);
1295 		break;
1296 	    }
1297 #ifdef CONFIG_IPV6_MIP6
1298 	case IPV6_SADDR_RULE_HOA:
1299 	    {
1300 		/* Rule 4: Prefer home address */
1301 		int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1302 		ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1303 		break;
1304 	    }
1305 #endif
1306 	case IPV6_SADDR_RULE_OIF:
1307 		/* Rule 5: Prefer outgoing interface */
1308 		ret = (!dst->ifindex ||
1309 		       dst->ifindex == score->ifa->idev->dev->ifindex);
1310 		break;
1311 	case IPV6_SADDR_RULE_LABEL:
1312 		/* Rule 6: Prefer matching label */
1313 		ret = ipv6_addr_label(net,
1314 				      &score->ifa->addr, score->addr_type,
1315 				      score->ifa->idev->dev->ifindex) == dst->label;
1316 		break;
1317 	case IPV6_SADDR_RULE_PRIVACY:
1318 	    {
1319 		/* Rule 7: Prefer public address
1320 		 * Note: prefer temporary address if use_tempaddr >= 2
1321 		 */
1322 		int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1323 				!!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1324 				score->ifa->idev->cnf.use_tempaddr >= 2;
1325 		ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1326 		break;
1327 	    }
1328 	case IPV6_SADDR_RULE_ORCHID:
1329 		/* Rule 8-: Prefer ORCHID vs ORCHID or
1330 		 *	    non-ORCHID vs non-ORCHID
1331 		 */
1332 		ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1333 			ipv6_addr_orchid(dst->addr));
1334 		break;
1335 	case IPV6_SADDR_RULE_PREFIX:
1336 		/* Rule 8: Use longest matching prefix */
1337 		ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1338 		if (ret > score->ifa->prefix_len)
1339 			ret = score->ifa->prefix_len;
1340 		score->matchlen = ret;
1341 		break;
1342 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1343 	case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1344 		/* Optimistic addresses still have lower precedence than other
1345 		 * preferred addresses.
1346 		 */
1347 		ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1348 		break;
1349 #endif
1350 	default:
1351 		ret = 0;
1352 	}
1353 
1354 	if (ret)
1355 		__set_bit(i, score->scorebits);
1356 	score->rule = i;
1357 out:
1358 	return ret;
1359 }
1360 
1361 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1362 		       const struct in6_addr *daddr, unsigned int prefs,
1363 		       struct in6_addr *saddr)
1364 {
1365 	struct ipv6_saddr_score scores[2],
1366 				*score = &scores[0], *hiscore = &scores[1];
1367 	struct ipv6_saddr_dst dst;
1368 	struct net_device *dev;
1369 	int dst_type;
1370 
1371 	dst_type = __ipv6_addr_type(daddr);
1372 	dst.addr = daddr;
1373 	dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1374 	dst.scope = __ipv6_addr_src_scope(dst_type);
1375 	dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1376 	dst.prefs = prefs;
1377 
1378 	hiscore->rule = -1;
1379 	hiscore->ifa = NULL;
1380 
1381 	rcu_read_lock();
1382 
1383 	for_each_netdev_rcu(net, dev) {
1384 		struct inet6_dev *idev;
1385 
1386 		/* Candidate Source Address (section 4)
1387 		 *  - multicast and link-local destination address,
1388 		 *    the set of candidate source address MUST only
1389 		 *    include addresses assigned to interfaces
1390 		 *    belonging to the same link as the outgoing
1391 		 *    interface.
1392 		 * (- For site-local destination addresses, the
1393 		 *    set of candidate source addresses MUST only
1394 		 *    include addresses assigned to interfaces
1395 		 *    belonging to the same site as the outgoing
1396 		 *    interface.)
1397 		 */
1398 		if (((dst_type & IPV6_ADDR_MULTICAST) ||
1399 		     dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1400 		    dst.ifindex && dev->ifindex != dst.ifindex)
1401 			continue;
1402 
1403 		idev = __in6_dev_get(dev);
1404 		if (!idev)
1405 			continue;
1406 
1407 		read_lock_bh(&idev->lock);
1408 		list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1409 			int i;
1410 
1411 			/*
1412 			 * - Tentative Address (RFC2462 section 5.4)
1413 			 *  - A tentative address is not considered
1414 			 *    "assigned to an interface" in the traditional
1415 			 *    sense, unless it is also flagged as optimistic.
1416 			 * - Candidate Source Address (section 4)
1417 			 *  - In any case, anycast addresses, multicast
1418 			 *    addresses, and the unspecified address MUST
1419 			 *    NOT be included in a candidate set.
1420 			 */
1421 			if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1422 			    (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1423 				continue;
1424 
1425 			score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1426 
1427 			if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1428 				     score->addr_type & IPV6_ADDR_MULTICAST)) {
1429 				net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1430 						    dev->name);
1431 				continue;
1432 			}
1433 
1434 			score->rule = -1;
1435 			bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1436 
1437 			for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1438 				int minihiscore, miniscore;
1439 
1440 				minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1441 				miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1442 
1443 				if (minihiscore > miniscore) {
1444 					if (i == IPV6_SADDR_RULE_SCOPE &&
1445 					    score->scopedist > 0) {
1446 						/*
1447 						 * special case:
1448 						 * each remaining entry
1449 						 * has too small (not enough)
1450 						 * scope, because ifa entries
1451 						 * are sorted by their scope
1452 						 * values.
1453 						 */
1454 						goto try_nextdev;
1455 					}
1456 					break;
1457 				} else if (minihiscore < miniscore) {
1458 					if (hiscore->ifa)
1459 						in6_ifa_put(hiscore->ifa);
1460 
1461 					in6_ifa_hold(score->ifa);
1462 
1463 					swap(hiscore, score);
1464 
1465 					/* restore our iterator */
1466 					score->ifa = hiscore->ifa;
1467 
1468 					break;
1469 				}
1470 			}
1471 		}
1472 try_nextdev:
1473 		read_unlock_bh(&idev->lock);
1474 	}
1475 	rcu_read_unlock();
1476 
1477 	if (!hiscore->ifa)
1478 		return -EADDRNOTAVAIL;
1479 
1480 	*saddr = hiscore->ifa->addr;
1481 	in6_ifa_put(hiscore->ifa);
1482 	return 0;
1483 }
1484 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1485 
1486 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1487 		      u32 banned_flags)
1488 {
1489 	struct inet6_ifaddr *ifp;
1490 	int err = -EADDRNOTAVAIL;
1491 
1492 	list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1493 		if (ifp->scope > IFA_LINK)
1494 			break;
1495 		if (ifp->scope == IFA_LINK &&
1496 		    !(ifp->flags & banned_flags)) {
1497 			*addr = ifp->addr;
1498 			err = 0;
1499 			break;
1500 		}
1501 	}
1502 	return err;
1503 }
1504 
1505 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1506 		    u32 banned_flags)
1507 {
1508 	struct inet6_dev *idev;
1509 	int err = -EADDRNOTAVAIL;
1510 
1511 	rcu_read_lock();
1512 	idev = __in6_dev_get(dev);
1513 	if (idev) {
1514 		read_lock_bh(&idev->lock);
1515 		err = __ipv6_get_lladdr(idev, addr, banned_flags);
1516 		read_unlock_bh(&idev->lock);
1517 	}
1518 	rcu_read_unlock();
1519 	return err;
1520 }
1521 
1522 static int ipv6_count_addresses(struct inet6_dev *idev)
1523 {
1524 	int cnt = 0;
1525 	struct inet6_ifaddr *ifp;
1526 
1527 	read_lock_bh(&idev->lock);
1528 	list_for_each_entry(ifp, &idev->addr_list, if_list)
1529 		cnt++;
1530 	read_unlock_bh(&idev->lock);
1531 	return cnt;
1532 }
1533 
1534 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1535 		  const struct net_device *dev, int strict)
1536 {
1537 	return ipv6_chk_addr_and_flags(net, addr, dev, strict, IFA_F_TENTATIVE);
1538 }
1539 EXPORT_SYMBOL(ipv6_chk_addr);
1540 
1541 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1542 			    const struct net_device *dev, int strict,
1543 			    u32 banned_flags)
1544 {
1545 	struct inet6_ifaddr *ifp;
1546 	unsigned int hash = inet6_addr_hash(addr);
1547 	u32 ifp_flags;
1548 
1549 	rcu_read_lock_bh();
1550 	hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1551 		if (!net_eq(dev_net(ifp->idev->dev), net))
1552 			continue;
1553 		/* Decouple optimistic from tentative for evaluation here.
1554 		 * Ban optimistic addresses explicitly, when required.
1555 		 */
1556 		ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1557 			    ? (ifp->flags&~IFA_F_TENTATIVE)
1558 			    : ifp->flags;
1559 		if (ipv6_addr_equal(&ifp->addr, addr) &&
1560 		    !(ifp_flags&banned_flags) &&
1561 		    (!dev || ifp->idev->dev == dev ||
1562 		     !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1563 			rcu_read_unlock_bh();
1564 			return 1;
1565 		}
1566 	}
1567 
1568 	rcu_read_unlock_bh();
1569 	return 0;
1570 }
1571 EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
1572 
1573 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1574 			       struct net_device *dev)
1575 {
1576 	unsigned int hash = inet6_addr_hash(addr);
1577 	struct inet6_ifaddr *ifp;
1578 
1579 	hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
1580 		if (!net_eq(dev_net(ifp->idev->dev), net))
1581 			continue;
1582 		if (ipv6_addr_equal(&ifp->addr, addr)) {
1583 			if (!dev || ifp->idev->dev == dev)
1584 				return true;
1585 		}
1586 	}
1587 	return false;
1588 }
1589 
1590 /* Compares an address/prefix_len with addresses on device @dev.
1591  * If one is found it returns true.
1592  */
1593 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1594 	const unsigned int prefix_len, struct net_device *dev)
1595 {
1596 	struct inet6_dev *idev;
1597 	struct inet6_ifaddr *ifa;
1598 	bool ret = false;
1599 
1600 	rcu_read_lock();
1601 	idev = __in6_dev_get(dev);
1602 	if (idev) {
1603 		read_lock_bh(&idev->lock);
1604 		list_for_each_entry(ifa, &idev->addr_list, if_list) {
1605 			ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1606 			if (ret)
1607 				break;
1608 		}
1609 		read_unlock_bh(&idev->lock);
1610 	}
1611 	rcu_read_unlock();
1612 
1613 	return ret;
1614 }
1615 EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1616 
1617 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1618 {
1619 	struct inet6_dev *idev;
1620 	struct inet6_ifaddr *ifa;
1621 	int	onlink;
1622 
1623 	onlink = 0;
1624 	rcu_read_lock();
1625 	idev = __in6_dev_get(dev);
1626 	if (idev) {
1627 		read_lock_bh(&idev->lock);
1628 		list_for_each_entry(ifa, &idev->addr_list, if_list) {
1629 			onlink = ipv6_prefix_equal(addr, &ifa->addr,
1630 						   ifa->prefix_len);
1631 			if (onlink)
1632 				break;
1633 		}
1634 		read_unlock_bh(&idev->lock);
1635 	}
1636 	rcu_read_unlock();
1637 	return onlink;
1638 }
1639 EXPORT_SYMBOL(ipv6_chk_prefix);
1640 
1641 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1642 				     struct net_device *dev, int strict)
1643 {
1644 	struct inet6_ifaddr *ifp, *result = NULL;
1645 	unsigned int hash = inet6_addr_hash(addr);
1646 
1647 	rcu_read_lock_bh();
1648 	hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
1649 		if (!net_eq(dev_net(ifp->idev->dev), net))
1650 			continue;
1651 		if (ipv6_addr_equal(&ifp->addr, addr)) {
1652 			if (!dev || ifp->idev->dev == dev ||
1653 			    !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1654 				result = ifp;
1655 				in6_ifa_hold(ifp);
1656 				break;
1657 			}
1658 		}
1659 	}
1660 	rcu_read_unlock_bh();
1661 
1662 	return result;
1663 }
1664 
1665 /* Gets referenced address, destroys ifaddr */
1666 
1667 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1668 {
1669 	if (ifp->flags&IFA_F_PERMANENT) {
1670 		spin_lock_bh(&ifp->lock);
1671 		addrconf_del_dad_work(ifp);
1672 		ifp->flags |= IFA_F_TENTATIVE;
1673 		if (dad_failed)
1674 			ifp->flags |= IFA_F_DADFAILED;
1675 		spin_unlock_bh(&ifp->lock);
1676 		if (dad_failed)
1677 			ipv6_ifa_notify(0, ifp);
1678 		in6_ifa_put(ifp);
1679 	} else if (ifp->flags&IFA_F_TEMPORARY) {
1680 		struct inet6_ifaddr *ifpub;
1681 		spin_lock_bh(&ifp->lock);
1682 		ifpub = ifp->ifpub;
1683 		if (ifpub) {
1684 			in6_ifa_hold(ifpub);
1685 			spin_unlock_bh(&ifp->lock);
1686 			ipv6_create_tempaddr(ifpub, ifp);
1687 			in6_ifa_put(ifpub);
1688 		} else {
1689 			spin_unlock_bh(&ifp->lock);
1690 		}
1691 		ipv6_del_addr(ifp);
1692 	} else {
1693 		ipv6_del_addr(ifp);
1694 	}
1695 }
1696 
1697 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1698 {
1699 	int err = -ENOENT;
1700 
1701 	spin_lock_bh(&ifp->lock);
1702 	if (ifp->state == INET6_IFADDR_STATE_DAD) {
1703 		ifp->state = INET6_IFADDR_STATE_POSTDAD;
1704 		err = 0;
1705 	}
1706 	spin_unlock_bh(&ifp->lock);
1707 
1708 	return err;
1709 }
1710 
1711 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1712 {
1713 	struct in6_addr addr;
1714 	struct inet6_dev *idev = ifp->idev;
1715 	struct net *net = dev_net(ifp->idev->dev);
1716 
1717 	if (addrconf_dad_end(ifp)) {
1718 		in6_ifa_put(ifp);
1719 		return;
1720 	}
1721 
1722 	net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1723 			     ifp->idev->dev->name, &ifp->addr);
1724 
1725 	spin_lock_bh(&ifp->lock);
1726 
1727 	if (ifp->flags & IFA_F_STABLE_PRIVACY) {
1728 		int scope = ifp->scope;
1729 		u32 flags = ifp->flags;
1730 		struct in6_addr new_addr;
1731 		struct inet6_ifaddr *ifp2;
1732 		u32 valid_lft, preferred_lft;
1733 		int pfxlen = ifp->prefix_len;
1734 		int retries = ifp->stable_privacy_retry + 1;
1735 
1736 		if (retries > net->ipv6.sysctl.idgen_retries) {
1737 			net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
1738 					     ifp->idev->dev->name);
1739 			goto errdad;
1740 		}
1741 
1742 		new_addr = ifp->addr;
1743 		if (ipv6_generate_stable_address(&new_addr, retries,
1744 						 idev))
1745 			goto errdad;
1746 
1747 		valid_lft = ifp->valid_lft;
1748 		preferred_lft = ifp->prefered_lft;
1749 
1750 		spin_unlock_bh(&ifp->lock);
1751 
1752 		if (idev->cnf.max_addresses &&
1753 		    ipv6_count_addresses(idev) >=
1754 		    idev->cnf.max_addresses)
1755 			goto lock_errdad;
1756 
1757 		net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
1758 				     ifp->idev->dev->name);
1759 
1760 		ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen,
1761 				     scope, flags, valid_lft,
1762 				     preferred_lft);
1763 		if (IS_ERR(ifp2))
1764 			goto lock_errdad;
1765 
1766 		spin_lock_bh(&ifp2->lock);
1767 		ifp2->stable_privacy_retry = retries;
1768 		ifp2->state = INET6_IFADDR_STATE_PREDAD;
1769 		spin_unlock_bh(&ifp2->lock);
1770 
1771 		addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
1772 		in6_ifa_put(ifp2);
1773 lock_errdad:
1774 		spin_lock_bh(&ifp->lock);
1775 	} else if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1776 		addr.s6_addr32[0] = htonl(0xfe800000);
1777 		addr.s6_addr32[1] = 0;
1778 
1779 		if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1780 		    ipv6_addr_equal(&ifp->addr, &addr)) {
1781 			/* DAD failed for link-local based on MAC address */
1782 			idev->cnf.disable_ipv6 = 1;
1783 
1784 			pr_info("%s: IPv6 being disabled!\n",
1785 				ifp->idev->dev->name);
1786 		}
1787 	}
1788 
1789 errdad:
1790 	/* transition from _POSTDAD to _ERRDAD */
1791 	ifp->state = INET6_IFADDR_STATE_ERRDAD;
1792 	spin_unlock_bh(&ifp->lock);
1793 
1794 	addrconf_mod_dad_work(ifp, 0);
1795 }
1796 
1797 /* Join to solicited addr multicast group.
1798  * caller must hold RTNL */
1799 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1800 {
1801 	struct in6_addr maddr;
1802 
1803 	if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1804 		return;
1805 
1806 	addrconf_addr_solict_mult(addr, &maddr);
1807 	ipv6_dev_mc_inc(dev, &maddr);
1808 }
1809 
1810 /* caller must hold RTNL */
1811 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1812 {
1813 	struct in6_addr maddr;
1814 
1815 	if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1816 		return;
1817 
1818 	addrconf_addr_solict_mult(addr, &maddr);
1819 	__ipv6_dev_mc_dec(idev, &maddr);
1820 }
1821 
1822 /* caller must hold RTNL */
1823 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1824 {
1825 	struct in6_addr addr;
1826 
1827 	if (ifp->prefix_len >= 127) /* RFC 6164 */
1828 		return;
1829 	ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1830 	if (ipv6_addr_any(&addr))
1831 		return;
1832 	__ipv6_dev_ac_inc(ifp->idev, &addr);
1833 }
1834 
1835 /* caller must hold RTNL */
1836 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1837 {
1838 	struct in6_addr addr;
1839 
1840 	if (ifp->prefix_len >= 127) /* RFC 6164 */
1841 		return;
1842 	ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1843 	if (ipv6_addr_any(&addr))
1844 		return;
1845 	__ipv6_dev_ac_dec(ifp->idev, &addr);
1846 }
1847 
1848 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1849 {
1850 	if (dev->addr_len != ETH_ALEN)
1851 		return -1;
1852 	memcpy(eui, dev->dev_addr, 3);
1853 	memcpy(eui + 5, dev->dev_addr + 3, 3);
1854 
1855 	/*
1856 	 * The zSeries OSA network cards can be shared among various
1857 	 * OS instances, but the OSA cards have only one MAC address.
1858 	 * This leads to duplicate address conflicts in conjunction
1859 	 * with IPv6 if more than one instance uses the same card.
1860 	 *
1861 	 * The driver for these cards can deliver a unique 16-bit
1862 	 * identifier for each instance sharing the same card.  It is
1863 	 * placed instead of 0xFFFE in the interface identifier.  The
1864 	 * "u" bit of the interface identifier is not inverted in this
1865 	 * case.  Hence the resulting interface identifier has local
1866 	 * scope according to RFC2373.
1867 	 */
1868 	if (dev->dev_id) {
1869 		eui[3] = (dev->dev_id >> 8) & 0xFF;
1870 		eui[4] = dev->dev_id & 0xFF;
1871 	} else {
1872 		eui[3] = 0xFF;
1873 		eui[4] = 0xFE;
1874 		eui[0] ^= 2;
1875 	}
1876 	return 0;
1877 }
1878 
1879 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1880 {
1881 	if (dev->addr_len != IEEE802154_ADDR_LEN)
1882 		return -1;
1883 	memcpy(eui, dev->dev_addr, 8);
1884 	eui[0] ^= 2;
1885 	return 0;
1886 }
1887 
1888 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
1889 {
1890 	union fwnet_hwaddr *ha;
1891 
1892 	if (dev->addr_len != FWNET_ALEN)
1893 		return -1;
1894 
1895 	ha = (union fwnet_hwaddr *)dev->dev_addr;
1896 
1897 	memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
1898 	eui[0] ^= 2;
1899 	return 0;
1900 }
1901 
1902 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1903 {
1904 	/* XXX: inherit EUI-64 from other interface -- yoshfuji */
1905 	if (dev->addr_len != ARCNET_ALEN)
1906 		return -1;
1907 	memset(eui, 0, 7);
1908 	eui[7] = *(u8 *)dev->dev_addr;
1909 	return 0;
1910 }
1911 
1912 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1913 {
1914 	if (dev->addr_len != INFINIBAND_ALEN)
1915 		return -1;
1916 	memcpy(eui, dev->dev_addr + 12, 8);
1917 	eui[0] |= 2;
1918 	return 0;
1919 }
1920 
1921 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1922 {
1923 	if (addr == 0)
1924 		return -1;
1925 	eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1926 		  ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1927 		  ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1928 		  ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1929 		  ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1930 		  ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1931 	eui[1] = 0;
1932 	eui[2] = 0x5E;
1933 	eui[3] = 0xFE;
1934 	memcpy(eui + 4, &addr, 4);
1935 	return 0;
1936 }
1937 
1938 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1939 {
1940 	if (dev->priv_flags & IFF_ISATAP)
1941 		return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1942 	return -1;
1943 }
1944 
1945 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
1946 {
1947 	return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1948 }
1949 
1950 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
1951 {
1952 	memcpy(eui, dev->perm_addr, 3);
1953 	memcpy(eui + 5, dev->perm_addr + 3, 3);
1954 	eui[3] = 0xFF;
1955 	eui[4] = 0xFE;
1956 	eui[0] ^= 2;
1957 	return 0;
1958 }
1959 
1960 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1961 {
1962 	switch (dev->type) {
1963 	case ARPHRD_ETHER:
1964 	case ARPHRD_FDDI:
1965 		return addrconf_ifid_eui48(eui, dev);
1966 	case ARPHRD_ARCNET:
1967 		return addrconf_ifid_arcnet(eui, dev);
1968 	case ARPHRD_INFINIBAND:
1969 		return addrconf_ifid_infiniband(eui, dev);
1970 	case ARPHRD_SIT:
1971 		return addrconf_ifid_sit(eui, dev);
1972 	case ARPHRD_IPGRE:
1973 		return addrconf_ifid_gre(eui, dev);
1974 	case ARPHRD_6LOWPAN:
1975 	case ARPHRD_IEEE802154:
1976 		return addrconf_ifid_eui64(eui, dev);
1977 	case ARPHRD_IEEE1394:
1978 		return addrconf_ifid_ieee1394(eui, dev);
1979 	case ARPHRD_TUNNEL6:
1980 		return addrconf_ifid_ip6tnl(eui, dev);
1981 	}
1982 	return -1;
1983 }
1984 
1985 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1986 {
1987 	int err = -1;
1988 	struct inet6_ifaddr *ifp;
1989 
1990 	read_lock_bh(&idev->lock);
1991 	list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1992 		if (ifp->scope > IFA_LINK)
1993 			break;
1994 		if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1995 			memcpy(eui, ifp->addr.s6_addr+8, 8);
1996 			err = 0;
1997 			break;
1998 		}
1999 	}
2000 	read_unlock_bh(&idev->lock);
2001 	return err;
2002 }
2003 
2004 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
2005 static void __ipv6_regen_rndid(struct inet6_dev *idev)
2006 {
2007 regen:
2008 	get_random_bytes(idev->rndid, sizeof(idev->rndid));
2009 	idev->rndid[0] &= ~0x02;
2010 
2011 	/*
2012 	 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
2013 	 * check if generated address is not inappropriate
2014 	 *
2015 	 *  - Reserved subnet anycast (RFC 2526)
2016 	 *	11111101 11....11 1xxxxxxx
2017 	 *  - ISATAP (RFC4214) 6.1
2018 	 *	00-00-5E-FE-xx-xx-xx-xx
2019 	 *  - value 0
2020 	 *  - XXX: already assigned to an address on the device
2021 	 */
2022 	if (idev->rndid[0] == 0xfd &&
2023 	    (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
2024 	    (idev->rndid[7]&0x80))
2025 		goto regen;
2026 	if ((idev->rndid[0]|idev->rndid[1]) == 0) {
2027 		if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
2028 			goto regen;
2029 		if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
2030 			goto regen;
2031 	}
2032 }
2033 
2034 static void ipv6_regen_rndid(unsigned long data)
2035 {
2036 	struct inet6_dev *idev = (struct inet6_dev *) data;
2037 	unsigned long expires;
2038 
2039 	rcu_read_lock_bh();
2040 	write_lock_bh(&idev->lock);
2041 
2042 	if (idev->dead)
2043 		goto out;
2044 
2045 	__ipv6_regen_rndid(idev);
2046 
2047 	expires = jiffies +
2048 		idev->cnf.temp_prefered_lft * HZ -
2049 		idev->cnf.regen_max_retry * idev->cnf.dad_transmits *
2050 		NEIGH_VAR(idev->nd_parms, RETRANS_TIME) -
2051 		idev->cnf.max_desync_factor * HZ;
2052 	if (time_before(expires, jiffies)) {
2053 		pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
2054 			__func__, idev->dev->name);
2055 		goto out;
2056 	}
2057 
2058 	if (!mod_timer(&idev->regen_timer, expires))
2059 		in6_dev_hold(idev);
2060 
2061 out:
2062 	write_unlock_bh(&idev->lock);
2063 	rcu_read_unlock_bh();
2064 	in6_dev_put(idev);
2065 }
2066 
2067 static void  __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
2068 {
2069 	if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
2070 		__ipv6_regen_rndid(idev);
2071 }
2072 
2073 /*
2074  *	Add prefix route.
2075  */
2076 
2077 static void
2078 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
2079 		      unsigned long expires, u32 flags)
2080 {
2081 	struct fib6_config cfg = {
2082 		.fc_table = RT6_TABLE_PREFIX,
2083 		.fc_metric = IP6_RT_PRIO_ADDRCONF,
2084 		.fc_ifindex = dev->ifindex,
2085 		.fc_expires = expires,
2086 		.fc_dst_len = plen,
2087 		.fc_flags = RTF_UP | flags,
2088 		.fc_nlinfo.nl_net = dev_net(dev),
2089 		.fc_protocol = RTPROT_KERNEL,
2090 	};
2091 
2092 	cfg.fc_dst = *pfx;
2093 
2094 	/* Prevent useless cloning on PtP SIT.
2095 	   This thing is done here expecting that the whole
2096 	   class of non-broadcast devices need not cloning.
2097 	 */
2098 #if IS_ENABLED(CONFIG_IPV6_SIT)
2099 	if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2100 		cfg.fc_flags |= RTF_NONEXTHOP;
2101 #endif
2102 
2103 	ip6_route_add(&cfg);
2104 }
2105 
2106 
2107 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2108 						  int plen,
2109 						  const struct net_device *dev,
2110 						  u32 flags, u32 noflags)
2111 {
2112 	struct fib6_node *fn;
2113 	struct rt6_info *rt = NULL;
2114 	struct fib6_table *table;
2115 
2116 	table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX);
2117 	if (!table)
2118 		return NULL;
2119 
2120 	read_lock_bh(&table->tb6_lock);
2121 	fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
2122 	if (!fn)
2123 		goto out;
2124 	for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
2125 		if (rt->dst.dev->ifindex != dev->ifindex)
2126 			continue;
2127 		if ((rt->rt6i_flags & flags) != flags)
2128 			continue;
2129 		if ((rt->rt6i_flags & noflags) != 0)
2130 			continue;
2131 		dst_hold(&rt->dst);
2132 		break;
2133 	}
2134 out:
2135 	read_unlock_bh(&table->tb6_lock);
2136 	return rt;
2137 }
2138 
2139 
2140 /* Create "default" multicast route to the interface */
2141 
2142 static void addrconf_add_mroute(struct net_device *dev)
2143 {
2144 	struct fib6_config cfg = {
2145 		.fc_table = RT6_TABLE_LOCAL,
2146 		.fc_metric = IP6_RT_PRIO_ADDRCONF,
2147 		.fc_ifindex = dev->ifindex,
2148 		.fc_dst_len = 8,
2149 		.fc_flags = RTF_UP,
2150 		.fc_nlinfo.nl_net = dev_net(dev),
2151 	};
2152 
2153 	ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2154 
2155 	ip6_route_add(&cfg);
2156 }
2157 
2158 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2159 {
2160 	struct inet6_dev *idev;
2161 
2162 	ASSERT_RTNL();
2163 
2164 	idev = ipv6_find_idev(dev);
2165 	if (!idev)
2166 		return ERR_PTR(-ENOBUFS);
2167 
2168 	if (idev->cnf.disable_ipv6)
2169 		return ERR_PTR(-EACCES);
2170 
2171 	/* Add default multicast route */
2172 	if (!(dev->flags & IFF_LOOPBACK))
2173 		addrconf_add_mroute(dev);
2174 
2175 	return idev;
2176 }
2177 
2178 static void manage_tempaddrs(struct inet6_dev *idev,
2179 			     struct inet6_ifaddr *ifp,
2180 			     __u32 valid_lft, __u32 prefered_lft,
2181 			     bool create, unsigned long now)
2182 {
2183 	u32 flags;
2184 	struct inet6_ifaddr *ift;
2185 
2186 	read_lock_bh(&idev->lock);
2187 	/* update all temporary addresses in the list */
2188 	list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2189 		int age, max_valid, max_prefered;
2190 
2191 		if (ifp != ift->ifpub)
2192 			continue;
2193 
2194 		/* RFC 4941 section 3.3:
2195 		 * If a received option will extend the lifetime of a public
2196 		 * address, the lifetimes of temporary addresses should
2197 		 * be extended, subject to the overall constraint that no
2198 		 * temporary addresses should ever remain "valid" or "preferred"
2199 		 * for a time longer than (TEMP_VALID_LIFETIME) or
2200 		 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2201 		 */
2202 		age = (now - ift->cstamp) / HZ;
2203 		max_valid = idev->cnf.temp_valid_lft - age;
2204 		if (max_valid < 0)
2205 			max_valid = 0;
2206 
2207 		max_prefered = idev->cnf.temp_prefered_lft -
2208 			       idev->cnf.max_desync_factor - age;
2209 		if (max_prefered < 0)
2210 			max_prefered = 0;
2211 
2212 		if (valid_lft > max_valid)
2213 			valid_lft = max_valid;
2214 
2215 		if (prefered_lft > max_prefered)
2216 			prefered_lft = max_prefered;
2217 
2218 		spin_lock(&ift->lock);
2219 		flags = ift->flags;
2220 		ift->valid_lft = valid_lft;
2221 		ift->prefered_lft = prefered_lft;
2222 		ift->tstamp = now;
2223 		if (prefered_lft > 0)
2224 			ift->flags &= ~IFA_F_DEPRECATED;
2225 
2226 		spin_unlock(&ift->lock);
2227 		if (!(flags&IFA_F_TENTATIVE))
2228 			ipv6_ifa_notify(0, ift);
2229 	}
2230 
2231 	if ((create || list_empty(&idev->tempaddr_list)) &&
2232 	    idev->cnf.use_tempaddr > 0) {
2233 		/* When a new public address is created as described
2234 		 * in [ADDRCONF], also create a new temporary address.
2235 		 * Also create a temporary address if it's enabled but
2236 		 * no temporary address currently exists.
2237 		 */
2238 		read_unlock_bh(&idev->lock);
2239 		ipv6_create_tempaddr(ifp, NULL);
2240 	} else {
2241 		read_unlock_bh(&idev->lock);
2242 	}
2243 }
2244 
2245 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2246 {
2247 	struct prefix_info *pinfo;
2248 	__u32 valid_lft;
2249 	__u32 prefered_lft;
2250 	int addr_type;
2251 	u32 addr_flags = 0;
2252 	struct inet6_dev *in6_dev;
2253 	struct net *net = dev_net(dev);
2254 
2255 	pinfo = (struct prefix_info *) opt;
2256 
2257 	if (len < sizeof(struct prefix_info)) {
2258 		ADBG("addrconf: prefix option too short\n");
2259 		return;
2260 	}
2261 
2262 	/*
2263 	 *	Validation checks ([ADDRCONF], page 19)
2264 	 */
2265 
2266 	addr_type = ipv6_addr_type(&pinfo->prefix);
2267 
2268 	if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2269 		return;
2270 
2271 	valid_lft = ntohl(pinfo->valid);
2272 	prefered_lft = ntohl(pinfo->prefered);
2273 
2274 	if (prefered_lft > valid_lft) {
2275 		net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2276 		return;
2277 	}
2278 
2279 	in6_dev = in6_dev_get(dev);
2280 
2281 	if (!in6_dev) {
2282 		net_dbg_ratelimited("addrconf: device %s not configured\n",
2283 				    dev->name);
2284 		return;
2285 	}
2286 
2287 	/*
2288 	 *	Two things going on here:
2289 	 *	1) Add routes for on-link prefixes
2290 	 *	2) Configure prefixes with the auto flag set
2291 	 */
2292 
2293 	if (pinfo->onlink) {
2294 		struct rt6_info *rt;
2295 		unsigned long rt_expires;
2296 
2297 		/* Avoid arithmetic overflow. Really, we could
2298 		 * save rt_expires in seconds, likely valid_lft,
2299 		 * but it would require division in fib gc, that it
2300 		 * not good.
2301 		 */
2302 		if (HZ > USER_HZ)
2303 			rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2304 		else
2305 			rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2306 
2307 		if (addrconf_finite_timeout(rt_expires))
2308 			rt_expires *= HZ;
2309 
2310 		rt = addrconf_get_prefix_route(&pinfo->prefix,
2311 					       pinfo->prefix_len,
2312 					       dev,
2313 					       RTF_ADDRCONF | RTF_PREFIX_RT,
2314 					       RTF_GATEWAY | RTF_DEFAULT);
2315 
2316 		if (rt) {
2317 			/* Autoconf prefix route */
2318 			if (valid_lft == 0) {
2319 				ip6_del_rt(rt);
2320 				rt = NULL;
2321 			} else if (addrconf_finite_timeout(rt_expires)) {
2322 				/* not infinity */
2323 				rt6_set_expires(rt, jiffies + rt_expires);
2324 			} else {
2325 				rt6_clean_expires(rt);
2326 			}
2327 		} else if (valid_lft) {
2328 			clock_t expires = 0;
2329 			int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2330 			if (addrconf_finite_timeout(rt_expires)) {
2331 				/* not infinity */
2332 				flags |= RTF_EXPIRES;
2333 				expires = jiffies_to_clock_t(rt_expires);
2334 			}
2335 			addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2336 					      dev, expires, flags);
2337 		}
2338 		ip6_rt_put(rt);
2339 	}
2340 
2341 	/* Try to figure out our local address for this prefix */
2342 
2343 	if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2344 		struct inet6_ifaddr *ifp;
2345 		struct in6_addr addr;
2346 		int create = 0, update_lft = 0;
2347 		bool tokenized = false;
2348 
2349 		if (pinfo->prefix_len == 64) {
2350 			memcpy(&addr, &pinfo->prefix, 8);
2351 
2352 			if (!ipv6_addr_any(&in6_dev->token)) {
2353 				read_lock_bh(&in6_dev->lock);
2354 				memcpy(addr.s6_addr + 8,
2355 				       in6_dev->token.s6_addr + 8, 8);
2356 				read_unlock_bh(&in6_dev->lock);
2357 				tokenized = true;
2358 			} else if (in6_dev->addr_gen_mode ==
2359 				   IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
2360 				   !ipv6_generate_stable_address(&addr, 0,
2361 								 in6_dev)) {
2362 				addr_flags |= IFA_F_STABLE_PRIVACY;
2363 				goto ok;
2364 			} else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2365 				   ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2366 				in6_dev_put(in6_dev);
2367 				return;
2368 			}
2369 			goto ok;
2370 		}
2371 		net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2372 				    pinfo->prefix_len);
2373 		in6_dev_put(in6_dev);
2374 		return;
2375 
2376 ok:
2377 
2378 		ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
2379 
2380 		if (!ifp && valid_lft) {
2381 			int max_addresses = in6_dev->cnf.max_addresses;
2382 
2383 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2384 			if (in6_dev->cnf.optimistic_dad &&
2385 			    !net->ipv6.devconf_all->forwarding && sllao)
2386 				addr_flags = IFA_F_OPTIMISTIC;
2387 #endif
2388 
2389 			/* Do not allow to create too much of autoconfigured
2390 			 * addresses; this would be too easy way to crash kernel.
2391 			 */
2392 			if (!max_addresses ||
2393 			    ipv6_count_addresses(in6_dev) < max_addresses)
2394 				ifp = ipv6_add_addr(in6_dev, &addr, NULL,
2395 						    pinfo->prefix_len,
2396 						    addr_type&IPV6_ADDR_SCOPE_MASK,
2397 						    addr_flags, valid_lft,
2398 						    prefered_lft);
2399 
2400 			if (IS_ERR_OR_NULL(ifp)) {
2401 				in6_dev_put(in6_dev);
2402 				return;
2403 			}
2404 
2405 			update_lft = 0;
2406 			create = 1;
2407 			spin_lock_bh(&ifp->lock);
2408 			ifp->flags |= IFA_F_MANAGETEMPADDR;
2409 			ifp->cstamp = jiffies;
2410 			ifp->tokenized = tokenized;
2411 			spin_unlock_bh(&ifp->lock);
2412 			addrconf_dad_start(ifp);
2413 		}
2414 
2415 		if (ifp) {
2416 			u32 flags;
2417 			unsigned long now;
2418 			u32 stored_lft;
2419 
2420 			/* update lifetime (RFC2462 5.5.3 e) */
2421 			spin_lock_bh(&ifp->lock);
2422 			now = jiffies;
2423 			if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2424 				stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2425 			else
2426 				stored_lft = 0;
2427 			if (!update_lft && !create && stored_lft) {
2428 				const u32 minimum_lft = min_t(u32,
2429 					stored_lft, MIN_VALID_LIFETIME);
2430 				valid_lft = max(valid_lft, minimum_lft);
2431 
2432 				/* RFC4862 Section 5.5.3e:
2433 				 * "Note that the preferred lifetime of the
2434 				 *  corresponding address is always reset to
2435 				 *  the Preferred Lifetime in the received
2436 				 *  Prefix Information option, regardless of
2437 				 *  whether the valid lifetime is also reset or
2438 				 *  ignored."
2439 				 *
2440 				 * So we should always update prefered_lft here.
2441 				 */
2442 				update_lft = 1;
2443 			}
2444 
2445 			if (update_lft) {
2446 				ifp->valid_lft = valid_lft;
2447 				ifp->prefered_lft = prefered_lft;
2448 				ifp->tstamp = now;
2449 				flags = ifp->flags;
2450 				ifp->flags &= ~IFA_F_DEPRECATED;
2451 				spin_unlock_bh(&ifp->lock);
2452 
2453 				if (!(flags&IFA_F_TENTATIVE))
2454 					ipv6_ifa_notify(0, ifp);
2455 			} else
2456 				spin_unlock_bh(&ifp->lock);
2457 
2458 			manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2459 					 create, now);
2460 
2461 			in6_ifa_put(ifp);
2462 			addrconf_verify();
2463 		}
2464 	}
2465 	inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2466 	in6_dev_put(in6_dev);
2467 }
2468 
2469 /*
2470  *	Set destination address.
2471  *	Special case for SIT interfaces where we create a new "virtual"
2472  *	device.
2473  */
2474 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2475 {
2476 	struct in6_ifreq ireq;
2477 	struct net_device *dev;
2478 	int err = -EINVAL;
2479 
2480 	rtnl_lock();
2481 
2482 	err = -EFAULT;
2483 	if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2484 		goto err_exit;
2485 
2486 	dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2487 
2488 	err = -ENODEV;
2489 	if (!dev)
2490 		goto err_exit;
2491 
2492 #if IS_ENABLED(CONFIG_IPV6_SIT)
2493 	if (dev->type == ARPHRD_SIT) {
2494 		const struct net_device_ops *ops = dev->netdev_ops;
2495 		struct ifreq ifr;
2496 		struct ip_tunnel_parm p;
2497 
2498 		err = -EADDRNOTAVAIL;
2499 		if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2500 			goto err_exit;
2501 
2502 		memset(&p, 0, sizeof(p));
2503 		p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2504 		p.iph.saddr = 0;
2505 		p.iph.version = 4;
2506 		p.iph.ihl = 5;
2507 		p.iph.protocol = IPPROTO_IPV6;
2508 		p.iph.ttl = 64;
2509 		ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2510 
2511 		if (ops->ndo_do_ioctl) {
2512 			mm_segment_t oldfs = get_fs();
2513 
2514 			set_fs(KERNEL_DS);
2515 			err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2516 			set_fs(oldfs);
2517 		} else
2518 			err = -EOPNOTSUPP;
2519 
2520 		if (err == 0) {
2521 			err = -ENOBUFS;
2522 			dev = __dev_get_by_name(net, p.name);
2523 			if (!dev)
2524 				goto err_exit;
2525 			err = dev_open(dev);
2526 		}
2527 	}
2528 #endif
2529 
2530 err_exit:
2531 	rtnl_unlock();
2532 	return err;
2533 }
2534 
2535 static int ipv6_mc_config(struct sock *sk, bool join,
2536 			  const struct in6_addr *addr, int ifindex)
2537 {
2538 	int ret;
2539 
2540 	ASSERT_RTNL();
2541 
2542 	lock_sock(sk);
2543 	if (join)
2544 		ret = ipv6_sock_mc_join(sk, ifindex, addr);
2545 	else
2546 		ret = ipv6_sock_mc_drop(sk, ifindex, addr);
2547 	release_sock(sk);
2548 
2549 	return ret;
2550 }
2551 
2552 /*
2553  *	Manual configuration of address on an interface
2554  */
2555 static int inet6_addr_add(struct net *net, int ifindex,
2556 			  const struct in6_addr *pfx,
2557 			  const struct in6_addr *peer_pfx,
2558 			  unsigned int plen, __u32 ifa_flags,
2559 			  __u32 prefered_lft, __u32 valid_lft)
2560 {
2561 	struct inet6_ifaddr *ifp;
2562 	struct inet6_dev *idev;
2563 	struct net_device *dev;
2564 	unsigned long timeout;
2565 	clock_t expires;
2566 	int scope;
2567 	u32 flags;
2568 
2569 	ASSERT_RTNL();
2570 
2571 	if (plen > 128)
2572 		return -EINVAL;
2573 
2574 	/* check the lifetime */
2575 	if (!valid_lft || prefered_lft > valid_lft)
2576 		return -EINVAL;
2577 
2578 	if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2579 		return -EINVAL;
2580 
2581 	dev = __dev_get_by_index(net, ifindex);
2582 	if (!dev)
2583 		return -ENODEV;
2584 
2585 	idev = addrconf_add_dev(dev);
2586 	if (IS_ERR(idev))
2587 		return PTR_ERR(idev);
2588 
2589 	if (ifa_flags & IFA_F_MCAUTOJOIN) {
2590 		int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2591 					 true, pfx, ifindex);
2592 
2593 		if (ret < 0)
2594 			return ret;
2595 	}
2596 
2597 	scope = ipv6_addr_scope(pfx);
2598 
2599 	timeout = addrconf_timeout_fixup(valid_lft, HZ);
2600 	if (addrconf_finite_timeout(timeout)) {
2601 		expires = jiffies_to_clock_t(timeout * HZ);
2602 		valid_lft = timeout;
2603 		flags = RTF_EXPIRES;
2604 	} else {
2605 		expires = 0;
2606 		flags = 0;
2607 		ifa_flags |= IFA_F_PERMANENT;
2608 	}
2609 
2610 	timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2611 	if (addrconf_finite_timeout(timeout)) {
2612 		if (timeout == 0)
2613 			ifa_flags |= IFA_F_DEPRECATED;
2614 		prefered_lft = timeout;
2615 	}
2616 
2617 	ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2618 			    valid_lft, prefered_lft);
2619 
2620 	if (!IS_ERR(ifp)) {
2621 		if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
2622 			addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2623 					      expires, flags);
2624 		}
2625 
2626 		/*
2627 		 * Note that section 3.1 of RFC 4429 indicates
2628 		 * that the Optimistic flag should not be set for
2629 		 * manually configured addresses
2630 		 */
2631 		addrconf_dad_start(ifp);
2632 		if (ifa_flags & IFA_F_MANAGETEMPADDR)
2633 			manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2634 					 true, jiffies);
2635 		in6_ifa_put(ifp);
2636 		addrconf_verify_rtnl();
2637 		return 0;
2638 	} else if (ifa_flags & IFA_F_MCAUTOJOIN) {
2639 		ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2640 			       false, pfx, ifindex);
2641 	}
2642 
2643 	return PTR_ERR(ifp);
2644 }
2645 
2646 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2647 			  const struct in6_addr *pfx, unsigned int plen)
2648 {
2649 	struct inet6_ifaddr *ifp;
2650 	struct inet6_dev *idev;
2651 	struct net_device *dev;
2652 
2653 	if (plen > 128)
2654 		return -EINVAL;
2655 
2656 	dev = __dev_get_by_index(net, ifindex);
2657 	if (!dev)
2658 		return -ENODEV;
2659 
2660 	idev = __in6_dev_get(dev);
2661 	if (!idev)
2662 		return -ENXIO;
2663 
2664 	read_lock_bh(&idev->lock);
2665 	list_for_each_entry(ifp, &idev->addr_list, if_list) {
2666 		if (ifp->prefix_len == plen &&
2667 		    ipv6_addr_equal(pfx, &ifp->addr)) {
2668 			in6_ifa_hold(ifp);
2669 			read_unlock_bh(&idev->lock);
2670 
2671 			if (!(ifp->flags & IFA_F_TEMPORARY) &&
2672 			    (ifa_flags & IFA_F_MANAGETEMPADDR))
2673 				manage_tempaddrs(idev, ifp, 0, 0, false,
2674 						 jiffies);
2675 			ipv6_del_addr(ifp);
2676 			addrconf_verify_rtnl();
2677 			if (ipv6_addr_is_multicast(pfx)) {
2678 				ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2679 					       false, pfx, dev->ifindex);
2680 			}
2681 			return 0;
2682 		}
2683 	}
2684 	read_unlock_bh(&idev->lock);
2685 	return -EADDRNOTAVAIL;
2686 }
2687 
2688 
2689 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2690 {
2691 	struct in6_ifreq ireq;
2692 	int err;
2693 
2694 	if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2695 		return -EPERM;
2696 
2697 	if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2698 		return -EFAULT;
2699 
2700 	rtnl_lock();
2701 	err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
2702 			     ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2703 			     INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2704 	rtnl_unlock();
2705 	return err;
2706 }
2707 
2708 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2709 {
2710 	struct in6_ifreq ireq;
2711 	int err;
2712 
2713 	if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2714 		return -EPERM;
2715 
2716 	if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2717 		return -EFAULT;
2718 
2719 	rtnl_lock();
2720 	err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
2721 			     ireq.ifr6_prefixlen);
2722 	rtnl_unlock();
2723 	return err;
2724 }
2725 
2726 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2727 		     int plen, int scope)
2728 {
2729 	struct inet6_ifaddr *ifp;
2730 
2731 	ifp = ipv6_add_addr(idev, addr, NULL, plen,
2732 			    scope, IFA_F_PERMANENT,
2733 			    INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2734 	if (!IS_ERR(ifp)) {
2735 		spin_lock_bh(&ifp->lock);
2736 		ifp->flags &= ~IFA_F_TENTATIVE;
2737 		spin_unlock_bh(&ifp->lock);
2738 		ipv6_ifa_notify(RTM_NEWADDR, ifp);
2739 		in6_ifa_put(ifp);
2740 	}
2741 }
2742 
2743 #if IS_ENABLED(CONFIG_IPV6_SIT)
2744 static void sit_add_v4_addrs(struct inet6_dev *idev)
2745 {
2746 	struct in6_addr addr;
2747 	struct net_device *dev;
2748 	struct net *net = dev_net(idev->dev);
2749 	int scope, plen;
2750 	u32 pflags = 0;
2751 
2752 	ASSERT_RTNL();
2753 
2754 	memset(&addr, 0, sizeof(struct in6_addr));
2755 	memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2756 
2757 	if (idev->dev->flags&IFF_POINTOPOINT) {
2758 		addr.s6_addr32[0] = htonl(0xfe800000);
2759 		scope = IFA_LINK;
2760 		plen = 64;
2761 	} else {
2762 		scope = IPV6_ADDR_COMPATv4;
2763 		plen = 96;
2764 		pflags |= RTF_NONEXTHOP;
2765 	}
2766 
2767 	if (addr.s6_addr32[3]) {
2768 		add_addr(idev, &addr, plen, scope);
2769 		addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
2770 		return;
2771 	}
2772 
2773 	for_each_netdev(net, dev) {
2774 		struct in_device *in_dev = __in_dev_get_rtnl(dev);
2775 		if (in_dev && (dev->flags & IFF_UP)) {
2776 			struct in_ifaddr *ifa;
2777 
2778 			int flag = scope;
2779 
2780 			for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2781 
2782 				addr.s6_addr32[3] = ifa->ifa_local;
2783 
2784 				if (ifa->ifa_scope == RT_SCOPE_LINK)
2785 					continue;
2786 				if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2787 					if (idev->dev->flags&IFF_POINTOPOINT)
2788 						continue;
2789 					flag |= IFA_HOST;
2790 				}
2791 
2792 				add_addr(idev, &addr, plen, flag);
2793 				addrconf_prefix_route(&addr, plen, idev->dev, 0,
2794 						      pflags);
2795 			}
2796 		}
2797 	}
2798 }
2799 #endif
2800 
2801 static void init_loopback(struct net_device *dev)
2802 {
2803 	struct inet6_dev  *idev;
2804 	struct net_device *sp_dev;
2805 	struct inet6_ifaddr *sp_ifa;
2806 	struct rt6_info *sp_rt;
2807 
2808 	/* ::1 */
2809 
2810 	ASSERT_RTNL();
2811 
2812 	idev = ipv6_find_idev(dev);
2813 	if (!idev) {
2814 		pr_debug("%s: add_dev failed\n", __func__);
2815 		return;
2816 	}
2817 
2818 	add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2819 
2820 	/* Add routes to other interface's IPv6 addresses */
2821 	for_each_netdev(dev_net(dev), sp_dev) {
2822 		if (!strcmp(sp_dev->name, dev->name))
2823 			continue;
2824 
2825 		idev = __in6_dev_get(sp_dev);
2826 		if (!idev)
2827 			continue;
2828 
2829 		read_lock_bh(&idev->lock);
2830 		list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
2831 
2832 			if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
2833 				continue;
2834 
2835 			if (sp_ifa->rt) {
2836 				/* This dst has been added to garbage list when
2837 				 * lo device down, release this obsolete dst and
2838 				 * reallocate a new router for ifa.
2839 				 */
2840 				if (sp_ifa->rt->dst.obsolete > 0) {
2841 					ip6_rt_put(sp_ifa->rt);
2842 					sp_ifa->rt = NULL;
2843 				} else {
2844 					continue;
2845 				}
2846 			}
2847 
2848 			sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false);
2849 
2850 			/* Failure cases are ignored */
2851 			if (!IS_ERR(sp_rt)) {
2852 				sp_ifa->rt = sp_rt;
2853 				ip6_ins_rt(sp_rt);
2854 			}
2855 		}
2856 		read_unlock_bh(&idev->lock);
2857 	}
2858 }
2859 
2860 static void addrconf_add_linklocal(struct inet6_dev *idev,
2861 				   const struct in6_addr *addr, u32 flags)
2862 {
2863 	struct inet6_ifaddr *ifp;
2864 	u32 addr_flags = flags | IFA_F_PERMANENT;
2865 
2866 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2867 	if (idev->cnf.optimistic_dad &&
2868 	    !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2869 		addr_flags |= IFA_F_OPTIMISTIC;
2870 #endif
2871 
2872 	ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
2873 			    INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2874 	if (!IS_ERR(ifp)) {
2875 		addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2876 		addrconf_dad_start(ifp);
2877 		in6_ifa_put(ifp);
2878 	}
2879 }
2880 
2881 static bool ipv6_reserved_interfaceid(struct in6_addr address)
2882 {
2883 	if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
2884 		return true;
2885 
2886 	if (address.s6_addr32[2] == htonl(0x02005eff) &&
2887 	    ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
2888 		return true;
2889 
2890 	if (address.s6_addr32[2] == htonl(0xfdffffff) &&
2891 	    ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
2892 		return true;
2893 
2894 	return false;
2895 }
2896 
2897 static int ipv6_generate_stable_address(struct in6_addr *address,
2898 					u8 dad_count,
2899 					const struct inet6_dev *idev)
2900 {
2901 	static DEFINE_SPINLOCK(lock);
2902 	static __u32 digest[SHA_DIGEST_WORDS];
2903 	static __u32 workspace[SHA_WORKSPACE_WORDS];
2904 
2905 	static union {
2906 		char __data[SHA_MESSAGE_BYTES];
2907 		struct {
2908 			struct in6_addr secret;
2909 			__be32 prefix[2];
2910 			unsigned char hwaddr[MAX_ADDR_LEN];
2911 			u8 dad_count;
2912 		} __packed;
2913 	} data;
2914 
2915 	struct in6_addr secret;
2916 	struct in6_addr temp;
2917 	struct net *net = dev_net(idev->dev);
2918 
2919 	BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
2920 
2921 	if (idev->cnf.stable_secret.initialized)
2922 		secret = idev->cnf.stable_secret.secret;
2923 	else if (net->ipv6.devconf_dflt->stable_secret.initialized)
2924 		secret = net->ipv6.devconf_dflt->stable_secret.secret;
2925 	else
2926 		return -1;
2927 
2928 retry:
2929 	spin_lock_bh(&lock);
2930 
2931 	sha_init(digest);
2932 	memset(&data, 0, sizeof(data));
2933 	memset(workspace, 0, sizeof(workspace));
2934 	memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
2935 	data.prefix[0] = address->s6_addr32[0];
2936 	data.prefix[1] = address->s6_addr32[1];
2937 	data.secret = secret;
2938 	data.dad_count = dad_count;
2939 
2940 	sha_transform(digest, data.__data, workspace);
2941 
2942 	temp = *address;
2943 	temp.s6_addr32[2] = (__force __be32)digest[0];
2944 	temp.s6_addr32[3] = (__force __be32)digest[1];
2945 
2946 	spin_unlock_bh(&lock);
2947 
2948 	if (ipv6_reserved_interfaceid(temp)) {
2949 		dad_count++;
2950 		if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
2951 			return -1;
2952 		goto retry;
2953 	}
2954 
2955 	*address = temp;
2956 	return 0;
2957 }
2958 
2959 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
2960 {
2961 	struct in6_addr addr;
2962 
2963 	ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2964 
2965 	if (idev->addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY) {
2966 		if (!ipv6_generate_stable_address(&addr, 0, idev))
2967 			addrconf_add_linklocal(idev, &addr,
2968 					       IFA_F_STABLE_PRIVACY);
2969 		else if (prefix_route)
2970 			addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
2971 	} else if (idev->addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) {
2972 		/* addrconf_add_linklocal also adds a prefix_route and we
2973 		 * only need to care about prefix routes if ipv6_generate_eui64
2974 		 * couldn't generate one.
2975 		 */
2976 		if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
2977 			addrconf_add_linklocal(idev, &addr, 0);
2978 		else if (prefix_route)
2979 			addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
2980 	}
2981 }
2982 
2983 static void addrconf_dev_config(struct net_device *dev)
2984 {
2985 	struct inet6_dev *idev;
2986 
2987 	ASSERT_RTNL();
2988 
2989 	if ((dev->type != ARPHRD_ETHER) &&
2990 	    (dev->type != ARPHRD_FDDI) &&
2991 	    (dev->type != ARPHRD_ARCNET) &&
2992 	    (dev->type != ARPHRD_INFINIBAND) &&
2993 	    (dev->type != ARPHRD_IEEE802154) &&
2994 	    (dev->type != ARPHRD_IEEE1394) &&
2995 	    (dev->type != ARPHRD_TUNNEL6) &&
2996 	    (dev->type != ARPHRD_6LOWPAN)) {
2997 		/* Alas, we support only Ethernet autoconfiguration. */
2998 		return;
2999 	}
3000 
3001 	idev = addrconf_add_dev(dev);
3002 	if (IS_ERR(idev))
3003 		return;
3004 
3005 	addrconf_addr_gen(idev, false);
3006 }
3007 
3008 #if IS_ENABLED(CONFIG_IPV6_SIT)
3009 static void addrconf_sit_config(struct net_device *dev)
3010 {
3011 	struct inet6_dev *idev;
3012 
3013 	ASSERT_RTNL();
3014 
3015 	/*
3016 	 * Configure the tunnel with one of our IPv4
3017 	 * addresses... we should configure all of
3018 	 * our v4 addrs in the tunnel
3019 	 */
3020 
3021 	idev = ipv6_find_idev(dev);
3022 	if (!idev) {
3023 		pr_debug("%s: add_dev failed\n", __func__);
3024 		return;
3025 	}
3026 
3027 	if (dev->priv_flags & IFF_ISATAP) {
3028 		addrconf_addr_gen(idev, false);
3029 		return;
3030 	}
3031 
3032 	sit_add_v4_addrs(idev);
3033 
3034 	if (dev->flags&IFF_POINTOPOINT)
3035 		addrconf_add_mroute(dev);
3036 }
3037 #endif
3038 
3039 #if IS_ENABLED(CONFIG_NET_IPGRE)
3040 static void addrconf_gre_config(struct net_device *dev)
3041 {
3042 	struct inet6_dev *idev;
3043 
3044 	ASSERT_RTNL();
3045 
3046 	idev = ipv6_find_idev(dev);
3047 	if (!idev) {
3048 		pr_debug("%s: add_dev failed\n", __func__);
3049 		return;
3050 	}
3051 
3052 	addrconf_addr_gen(idev, true);
3053 }
3054 #endif
3055 
3056 static int addrconf_notify(struct notifier_block *this, unsigned long event,
3057 			   void *ptr)
3058 {
3059 	struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3060 	struct inet6_dev *idev = __in6_dev_get(dev);
3061 	int run_pending = 0;
3062 	int err;
3063 
3064 	switch (event) {
3065 	case NETDEV_REGISTER:
3066 		if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3067 			idev = ipv6_add_dev(dev);
3068 			if (IS_ERR(idev))
3069 				return notifier_from_errno(PTR_ERR(idev));
3070 		}
3071 		break;
3072 
3073 	case NETDEV_UP:
3074 	case NETDEV_CHANGE:
3075 		if (dev->flags & IFF_SLAVE)
3076 			break;
3077 
3078 		if (idev && idev->cnf.disable_ipv6)
3079 			break;
3080 
3081 		if (event == NETDEV_UP) {
3082 			if (!addrconf_qdisc_ok(dev)) {
3083 				/* device is not ready yet. */
3084 				pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3085 					dev->name);
3086 				break;
3087 			}
3088 
3089 			if (!idev && dev->mtu >= IPV6_MIN_MTU)
3090 				idev = ipv6_add_dev(dev);
3091 
3092 			if (!IS_ERR_OR_NULL(idev)) {
3093 				idev->if_flags |= IF_READY;
3094 				run_pending = 1;
3095 			}
3096 		} else {
3097 			if (!addrconf_qdisc_ok(dev)) {
3098 				/* device is still not ready. */
3099 				break;
3100 			}
3101 
3102 			if (idev) {
3103 				if (idev->if_flags & IF_READY)
3104 					/* device is already configured. */
3105 					break;
3106 				idev->if_flags |= IF_READY;
3107 			}
3108 
3109 			pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3110 				dev->name);
3111 
3112 			run_pending = 1;
3113 		}
3114 
3115 		switch (dev->type) {
3116 #if IS_ENABLED(CONFIG_IPV6_SIT)
3117 		case ARPHRD_SIT:
3118 			addrconf_sit_config(dev);
3119 			break;
3120 #endif
3121 #if IS_ENABLED(CONFIG_NET_IPGRE)
3122 		case ARPHRD_IPGRE:
3123 			addrconf_gre_config(dev);
3124 			break;
3125 #endif
3126 		case ARPHRD_LOOPBACK:
3127 			init_loopback(dev);
3128 			break;
3129 
3130 		default:
3131 			addrconf_dev_config(dev);
3132 			break;
3133 		}
3134 
3135 		if (!IS_ERR_OR_NULL(idev)) {
3136 			if (run_pending)
3137 				addrconf_dad_run(idev);
3138 
3139 			/*
3140 			 * If the MTU changed during the interface down,
3141 			 * when the interface up, the changed MTU must be
3142 			 * reflected in the idev as well as routers.
3143 			 */
3144 			if (idev->cnf.mtu6 != dev->mtu &&
3145 			    dev->mtu >= IPV6_MIN_MTU) {
3146 				rt6_mtu_change(dev, dev->mtu);
3147 				idev->cnf.mtu6 = dev->mtu;
3148 			}
3149 			idev->tstamp = jiffies;
3150 			inet6_ifinfo_notify(RTM_NEWLINK, idev);
3151 
3152 			/*
3153 			 * If the changed mtu during down is lower than
3154 			 * IPV6_MIN_MTU stop IPv6 on this interface.
3155 			 */
3156 			if (dev->mtu < IPV6_MIN_MTU)
3157 				addrconf_ifdown(dev, 1);
3158 		}
3159 		break;
3160 
3161 	case NETDEV_CHANGEMTU:
3162 		if (idev && dev->mtu >= IPV6_MIN_MTU) {
3163 			rt6_mtu_change(dev, dev->mtu);
3164 			idev->cnf.mtu6 = dev->mtu;
3165 			break;
3166 		}
3167 
3168 		if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3169 			idev = ipv6_add_dev(dev);
3170 			if (!IS_ERR(idev))
3171 				break;
3172 		}
3173 
3174 		/*
3175 		 * if MTU under IPV6_MIN_MTU.
3176 		 * Stop IPv6 on this interface.
3177 		 */
3178 
3179 	case NETDEV_DOWN:
3180 	case NETDEV_UNREGISTER:
3181 		/*
3182 		 *	Remove all addresses from this interface.
3183 		 */
3184 		addrconf_ifdown(dev, event != NETDEV_DOWN);
3185 		break;
3186 
3187 	case NETDEV_CHANGENAME:
3188 		if (idev) {
3189 			snmp6_unregister_dev(idev);
3190 			addrconf_sysctl_unregister(idev);
3191 			err = addrconf_sysctl_register(idev);
3192 			if (err)
3193 				return notifier_from_errno(err);
3194 			err = snmp6_register_dev(idev);
3195 			if (err) {
3196 				addrconf_sysctl_unregister(idev);
3197 				return notifier_from_errno(err);
3198 			}
3199 		}
3200 		break;
3201 
3202 	case NETDEV_PRE_TYPE_CHANGE:
3203 	case NETDEV_POST_TYPE_CHANGE:
3204 		addrconf_type_change(dev, event);
3205 		break;
3206 	}
3207 
3208 	return NOTIFY_OK;
3209 }
3210 
3211 /*
3212  *	addrconf module should be notified of a device going up
3213  */
3214 static struct notifier_block ipv6_dev_notf = {
3215 	.notifier_call = addrconf_notify,
3216 };
3217 
3218 static void addrconf_type_change(struct net_device *dev, unsigned long event)
3219 {
3220 	struct inet6_dev *idev;
3221 	ASSERT_RTNL();
3222 
3223 	idev = __in6_dev_get(dev);
3224 
3225 	if (event == NETDEV_POST_TYPE_CHANGE)
3226 		ipv6_mc_remap(idev);
3227 	else if (event == NETDEV_PRE_TYPE_CHANGE)
3228 		ipv6_mc_unmap(idev);
3229 }
3230 
3231 static int addrconf_ifdown(struct net_device *dev, int how)
3232 {
3233 	struct net *net = dev_net(dev);
3234 	struct inet6_dev *idev;
3235 	struct inet6_ifaddr *ifa;
3236 	int state, i;
3237 
3238 	ASSERT_RTNL();
3239 
3240 	rt6_ifdown(net, dev);
3241 	neigh_ifdown(&nd_tbl, dev);
3242 
3243 	idev = __in6_dev_get(dev);
3244 	if (!idev)
3245 		return -ENODEV;
3246 
3247 	/*
3248 	 * Step 1: remove reference to ipv6 device from parent device.
3249 	 *	   Do not dev_put!
3250 	 */
3251 	if (how) {
3252 		idev->dead = 1;
3253 
3254 		/* protected by rtnl_lock */
3255 		RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3256 
3257 		/* Step 1.5: remove snmp6 entry */
3258 		snmp6_unregister_dev(idev);
3259 
3260 	}
3261 
3262 	/* Step 2: clear hash table */
3263 	for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3264 		struct hlist_head *h = &inet6_addr_lst[i];
3265 
3266 		spin_lock_bh(&addrconf_hash_lock);
3267 restart:
3268 		hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3269 			if (ifa->idev == idev) {
3270 				hlist_del_init_rcu(&ifa->addr_lst);
3271 				addrconf_del_dad_work(ifa);
3272 				goto restart;
3273 			}
3274 		}
3275 		spin_unlock_bh(&addrconf_hash_lock);
3276 	}
3277 
3278 	write_lock_bh(&idev->lock);
3279 
3280 	addrconf_del_rs_timer(idev);
3281 
3282 	/* Step 2: clear flags for stateless addrconf */
3283 	if (!how)
3284 		idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3285 
3286 	if (how && del_timer(&idev->regen_timer))
3287 		in6_dev_put(idev);
3288 
3289 	/* Step 3: clear tempaddr list */
3290 	while (!list_empty(&idev->tempaddr_list)) {
3291 		ifa = list_first_entry(&idev->tempaddr_list,
3292 				       struct inet6_ifaddr, tmp_list);
3293 		list_del(&ifa->tmp_list);
3294 		write_unlock_bh(&idev->lock);
3295 		spin_lock_bh(&ifa->lock);
3296 
3297 		if (ifa->ifpub) {
3298 			in6_ifa_put(ifa->ifpub);
3299 			ifa->ifpub = NULL;
3300 		}
3301 		spin_unlock_bh(&ifa->lock);
3302 		in6_ifa_put(ifa);
3303 		write_lock_bh(&idev->lock);
3304 	}
3305 
3306 	while (!list_empty(&idev->addr_list)) {
3307 		ifa = list_first_entry(&idev->addr_list,
3308 				       struct inet6_ifaddr, if_list);
3309 		addrconf_del_dad_work(ifa);
3310 
3311 		list_del(&ifa->if_list);
3312 
3313 		write_unlock_bh(&idev->lock);
3314 
3315 		spin_lock_bh(&ifa->lock);
3316 		state = ifa->state;
3317 		ifa->state = INET6_IFADDR_STATE_DEAD;
3318 		spin_unlock_bh(&ifa->lock);
3319 
3320 		if (state != INET6_IFADDR_STATE_DEAD) {
3321 			__ipv6_ifa_notify(RTM_DELADDR, ifa);
3322 			inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3323 		}
3324 		in6_ifa_put(ifa);
3325 
3326 		write_lock_bh(&idev->lock);
3327 	}
3328 
3329 	write_unlock_bh(&idev->lock);
3330 
3331 	/* Step 5: Discard anycast and multicast list */
3332 	if (how) {
3333 		ipv6_ac_destroy_dev(idev);
3334 		ipv6_mc_destroy_dev(idev);
3335 	} else {
3336 		ipv6_mc_down(idev);
3337 	}
3338 
3339 	idev->tstamp = jiffies;
3340 
3341 	/* Last: Shot the device (if unregistered) */
3342 	if (how) {
3343 		addrconf_sysctl_unregister(idev);
3344 		neigh_parms_release(&nd_tbl, idev->nd_parms);
3345 		neigh_ifdown(&nd_tbl, dev);
3346 		in6_dev_put(idev);
3347 	}
3348 	return 0;
3349 }
3350 
3351 static void addrconf_rs_timer(unsigned long data)
3352 {
3353 	struct inet6_dev *idev = (struct inet6_dev *)data;
3354 	struct net_device *dev = idev->dev;
3355 	struct in6_addr lladdr;
3356 
3357 	write_lock(&idev->lock);
3358 	if (idev->dead || !(idev->if_flags & IF_READY))
3359 		goto out;
3360 
3361 	if (!ipv6_accept_ra(idev))
3362 		goto out;
3363 
3364 	/* Announcement received after solicitation was sent */
3365 	if (idev->if_flags & IF_RA_RCVD)
3366 		goto out;
3367 
3368 	if (idev->rs_probes++ < idev->cnf.rtr_solicits) {
3369 		write_unlock(&idev->lock);
3370 		if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3371 			ndisc_send_rs(dev, &lladdr,
3372 				      &in6addr_linklocal_allrouters);
3373 		else
3374 			goto put;
3375 
3376 		write_lock(&idev->lock);
3377 		/* The wait after the last probe can be shorter */
3378 		addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3379 					     idev->cnf.rtr_solicits) ?
3380 				      idev->cnf.rtr_solicit_delay :
3381 				      idev->cnf.rtr_solicit_interval);
3382 	} else {
3383 		/*
3384 		 * Note: we do not support deprecated "all on-link"
3385 		 * assumption any longer.
3386 		 */
3387 		pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3388 	}
3389 
3390 out:
3391 	write_unlock(&idev->lock);
3392 put:
3393 	in6_dev_put(idev);
3394 }
3395 
3396 /*
3397  *	Duplicate Address Detection
3398  */
3399 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3400 {
3401 	unsigned long rand_num;
3402 	struct inet6_dev *idev = ifp->idev;
3403 
3404 	if (ifp->flags & IFA_F_OPTIMISTIC)
3405 		rand_num = 0;
3406 	else
3407 		rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
3408 
3409 	ifp->dad_probes = idev->cnf.dad_transmits;
3410 	addrconf_mod_dad_work(ifp, rand_num);
3411 }
3412 
3413 static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
3414 {
3415 	struct inet6_dev *idev = ifp->idev;
3416 	struct net_device *dev = idev->dev;
3417 
3418 	addrconf_join_solict(dev, &ifp->addr);
3419 
3420 	prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
3421 
3422 	read_lock_bh(&idev->lock);
3423 	spin_lock(&ifp->lock);
3424 	if (ifp->state == INET6_IFADDR_STATE_DEAD)
3425 		goto out;
3426 
3427 	if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3428 	    idev->cnf.accept_dad < 1 ||
3429 	    !(ifp->flags&IFA_F_TENTATIVE) ||
3430 	    ifp->flags & IFA_F_NODAD) {
3431 		ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3432 		spin_unlock(&ifp->lock);
3433 		read_unlock_bh(&idev->lock);
3434 
3435 		addrconf_dad_completed(ifp);
3436 		return;
3437 	}
3438 
3439 	if (!(idev->if_flags & IF_READY)) {
3440 		spin_unlock(&ifp->lock);
3441 		read_unlock_bh(&idev->lock);
3442 		/*
3443 		 * If the device is not ready:
3444 		 * - keep it tentative if it is a permanent address.
3445 		 * - otherwise, kill it.
3446 		 */
3447 		in6_ifa_hold(ifp);
3448 		addrconf_dad_stop(ifp, 0);
3449 		return;
3450 	}
3451 
3452 	/*
3453 	 * Optimistic nodes can start receiving
3454 	 * Frames right away
3455 	 */
3456 	if (ifp->flags & IFA_F_OPTIMISTIC) {
3457 		ip6_ins_rt(ifp->rt);
3458 		if (ipv6_use_optimistic_addr(idev)) {
3459 			/* Because optimistic nodes can use this address,
3460 			 * notify listeners. If DAD fails, RTM_DELADDR is sent.
3461 			 */
3462 			ipv6_ifa_notify(RTM_NEWADDR, ifp);
3463 		}
3464 	}
3465 
3466 	addrconf_dad_kick(ifp);
3467 out:
3468 	spin_unlock(&ifp->lock);
3469 	read_unlock_bh(&idev->lock);
3470 }
3471 
3472 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
3473 {
3474 	bool begin_dad = false;
3475 
3476 	spin_lock_bh(&ifp->lock);
3477 	if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3478 		ifp->state = INET6_IFADDR_STATE_PREDAD;
3479 		begin_dad = true;
3480 	}
3481 	spin_unlock_bh(&ifp->lock);
3482 
3483 	if (begin_dad)
3484 		addrconf_mod_dad_work(ifp, 0);
3485 }
3486 
3487 static void addrconf_dad_work(struct work_struct *w)
3488 {
3489 	struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3490 						struct inet6_ifaddr,
3491 						dad_work);
3492 	struct inet6_dev *idev = ifp->idev;
3493 	struct in6_addr mcaddr;
3494 
3495 	enum {
3496 		DAD_PROCESS,
3497 		DAD_BEGIN,
3498 		DAD_ABORT,
3499 	} action = DAD_PROCESS;
3500 
3501 	rtnl_lock();
3502 
3503 	spin_lock_bh(&ifp->lock);
3504 	if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3505 		action = DAD_BEGIN;
3506 		ifp->state = INET6_IFADDR_STATE_DAD;
3507 	} else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3508 		action = DAD_ABORT;
3509 		ifp->state = INET6_IFADDR_STATE_POSTDAD;
3510 	}
3511 	spin_unlock_bh(&ifp->lock);
3512 
3513 	if (action == DAD_BEGIN) {
3514 		addrconf_dad_begin(ifp);
3515 		goto out;
3516 	} else if (action == DAD_ABORT) {
3517 		addrconf_dad_stop(ifp, 1);
3518 		goto out;
3519 	}
3520 
3521 	if (!ifp->dad_probes && addrconf_dad_end(ifp))
3522 		goto out;
3523 
3524 	write_lock_bh(&idev->lock);
3525 	if (idev->dead || !(idev->if_flags & IF_READY)) {
3526 		write_unlock_bh(&idev->lock);
3527 		goto out;
3528 	}
3529 
3530 	spin_lock(&ifp->lock);
3531 	if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3532 		spin_unlock(&ifp->lock);
3533 		write_unlock_bh(&idev->lock);
3534 		goto out;
3535 	}
3536 
3537 	if (ifp->dad_probes == 0) {
3538 		/*
3539 		 * DAD was successful
3540 		 */
3541 
3542 		ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3543 		spin_unlock(&ifp->lock);
3544 		write_unlock_bh(&idev->lock);
3545 
3546 		addrconf_dad_completed(ifp);
3547 
3548 		goto out;
3549 	}
3550 
3551 	ifp->dad_probes--;
3552 	addrconf_mod_dad_work(ifp,
3553 			      NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
3554 	spin_unlock(&ifp->lock);
3555 	write_unlock_bh(&idev->lock);
3556 
3557 	/* send a neighbour solicitation for our addr */
3558 	addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3559 	ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
3560 out:
3561 	in6_ifa_put(ifp);
3562 	rtnl_unlock();
3563 }
3564 
3565 /* ifp->idev must be at least read locked */
3566 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
3567 {
3568 	struct inet6_ifaddr *ifpiter;
3569 	struct inet6_dev *idev = ifp->idev;
3570 
3571 	list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
3572 		if (ifpiter->scope > IFA_LINK)
3573 			break;
3574 		if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
3575 		    (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
3576 				       IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
3577 		    IFA_F_PERMANENT)
3578 			return false;
3579 	}
3580 	return true;
3581 }
3582 
3583 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3584 {
3585 	struct net_device *dev = ifp->idev->dev;
3586 	struct in6_addr lladdr;
3587 	bool send_rs, send_mld;
3588 
3589 	addrconf_del_dad_work(ifp);
3590 
3591 	/*
3592 	 *	Configure the address for reception. Now it is valid.
3593 	 */
3594 
3595 	ipv6_ifa_notify(RTM_NEWADDR, ifp);
3596 
3597 	/* If added prefix is link local and we are prepared to process
3598 	   router advertisements, start sending router solicitations.
3599 	 */
3600 
3601 	read_lock_bh(&ifp->idev->lock);
3602 	send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
3603 	send_rs = send_mld &&
3604 		  ipv6_accept_ra(ifp->idev) &&
3605 		  ifp->idev->cnf.rtr_solicits > 0 &&
3606 		  (dev->flags&IFF_LOOPBACK) == 0;
3607 	read_unlock_bh(&ifp->idev->lock);
3608 
3609 	/* While dad is in progress mld report's source address is in6_addrany.
3610 	 * Resend with proper ll now.
3611 	 */
3612 	if (send_mld)
3613 		ipv6_mc_dad_complete(ifp->idev);
3614 
3615 	if (send_rs) {
3616 		/*
3617 		 *	If a host as already performed a random delay
3618 		 *	[...] as part of DAD [...] there is no need
3619 		 *	to delay again before sending the first RS
3620 		 */
3621 		if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3622 			return;
3623 		ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
3624 
3625 		write_lock_bh(&ifp->idev->lock);
3626 		spin_lock(&ifp->lock);
3627 		ifp->idev->rs_probes = 1;
3628 		ifp->idev->if_flags |= IF_RS_SENT;
3629 		addrconf_mod_rs_timer(ifp->idev,
3630 				      ifp->idev->cnf.rtr_solicit_interval);
3631 		spin_unlock(&ifp->lock);
3632 		write_unlock_bh(&ifp->idev->lock);
3633 	}
3634 }
3635 
3636 static void addrconf_dad_run(struct inet6_dev *idev)
3637 {
3638 	struct inet6_ifaddr *ifp;
3639 
3640 	read_lock_bh(&idev->lock);
3641 	list_for_each_entry(ifp, &idev->addr_list, if_list) {
3642 		spin_lock(&ifp->lock);
3643 		if (ifp->flags & IFA_F_TENTATIVE &&
3644 		    ifp->state == INET6_IFADDR_STATE_DAD)
3645 			addrconf_dad_kick(ifp);
3646 		spin_unlock(&ifp->lock);
3647 	}
3648 	read_unlock_bh(&idev->lock);
3649 }
3650 
3651 #ifdef CONFIG_PROC_FS
3652 struct if6_iter_state {
3653 	struct seq_net_private p;
3654 	int bucket;
3655 	int offset;
3656 };
3657 
3658 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
3659 {
3660 	struct inet6_ifaddr *ifa = NULL;
3661 	struct if6_iter_state *state = seq->private;
3662 	struct net *net = seq_file_net(seq);
3663 	int p = 0;
3664 
3665 	/* initial bucket if pos is 0 */
3666 	if (pos == 0) {
3667 		state->bucket = 0;
3668 		state->offset = 0;
3669 	}
3670 
3671 	for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3672 		hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
3673 					 addr_lst) {
3674 			if (!net_eq(dev_net(ifa->idev->dev), net))
3675 				continue;
3676 			/* sync with offset */
3677 			if (p < state->offset) {
3678 				p++;
3679 				continue;
3680 			}
3681 			state->offset++;
3682 			return ifa;
3683 		}
3684 
3685 		/* prepare for next bucket */
3686 		state->offset = 0;
3687 		p = 0;
3688 	}
3689 	return NULL;
3690 }
3691 
3692 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3693 					 struct inet6_ifaddr *ifa)
3694 {
3695 	struct if6_iter_state *state = seq->private;
3696 	struct net *net = seq_file_net(seq);
3697 
3698 	hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
3699 		if (!net_eq(dev_net(ifa->idev->dev), net))
3700 			continue;
3701 		state->offset++;
3702 		return ifa;
3703 	}
3704 
3705 	while (++state->bucket < IN6_ADDR_HSIZE) {
3706 		state->offset = 0;
3707 		hlist_for_each_entry_rcu_bh(ifa,
3708 				     &inet6_addr_lst[state->bucket], addr_lst) {
3709 			if (!net_eq(dev_net(ifa->idev->dev), net))
3710 				continue;
3711 			state->offset++;
3712 			return ifa;
3713 		}
3714 	}
3715 
3716 	return NULL;
3717 }
3718 
3719 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3720 	__acquires(rcu_bh)
3721 {
3722 	rcu_read_lock_bh();
3723 	return if6_get_first(seq, *pos);
3724 }
3725 
3726 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3727 {
3728 	struct inet6_ifaddr *ifa;
3729 
3730 	ifa = if6_get_next(seq, v);
3731 	++*pos;
3732 	return ifa;
3733 }
3734 
3735 static void if6_seq_stop(struct seq_file *seq, void *v)
3736 	__releases(rcu_bh)
3737 {
3738 	rcu_read_unlock_bh();
3739 }
3740 
3741 static int if6_seq_show(struct seq_file *seq, void *v)
3742 {
3743 	struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3744 	seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3745 		   &ifp->addr,
3746 		   ifp->idev->dev->ifindex,
3747 		   ifp->prefix_len,
3748 		   ifp->scope,
3749 		   (u8) ifp->flags,
3750 		   ifp->idev->dev->name);
3751 	return 0;
3752 }
3753 
3754 static const struct seq_operations if6_seq_ops = {
3755 	.start	= if6_seq_start,
3756 	.next	= if6_seq_next,
3757 	.show	= if6_seq_show,
3758 	.stop	= if6_seq_stop,
3759 };
3760 
3761 static int if6_seq_open(struct inode *inode, struct file *file)
3762 {
3763 	return seq_open_net(inode, file, &if6_seq_ops,
3764 			    sizeof(struct if6_iter_state));
3765 }
3766 
3767 static const struct file_operations if6_fops = {
3768 	.owner		= THIS_MODULE,
3769 	.open		= if6_seq_open,
3770 	.read		= seq_read,
3771 	.llseek		= seq_lseek,
3772 	.release	= seq_release_net,
3773 };
3774 
3775 static int __net_init if6_proc_net_init(struct net *net)
3776 {
3777 	if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
3778 		return -ENOMEM;
3779 	return 0;
3780 }
3781 
3782 static void __net_exit if6_proc_net_exit(struct net *net)
3783 {
3784 	remove_proc_entry("if_inet6", net->proc_net);
3785 }
3786 
3787 static struct pernet_operations if6_proc_net_ops = {
3788 	.init = if6_proc_net_init,
3789 	.exit = if6_proc_net_exit,
3790 };
3791 
3792 int __init if6_proc_init(void)
3793 {
3794 	return register_pernet_subsys(&if6_proc_net_ops);
3795 }
3796 
3797 void if6_proc_exit(void)
3798 {
3799 	unregister_pernet_subsys(&if6_proc_net_ops);
3800 }
3801 #endif	/* CONFIG_PROC_FS */
3802 
3803 #if IS_ENABLED(CONFIG_IPV6_MIP6)
3804 /* Check if address is a home address configured on any interface. */
3805 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3806 {
3807 	int ret = 0;
3808 	struct inet6_ifaddr *ifp = NULL;
3809 	unsigned int hash = inet6_addr_hash(addr);
3810 
3811 	rcu_read_lock_bh();
3812 	hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
3813 		if (!net_eq(dev_net(ifp->idev->dev), net))
3814 			continue;
3815 		if (ipv6_addr_equal(&ifp->addr, addr) &&
3816 		    (ifp->flags & IFA_F_HOMEADDRESS)) {
3817 			ret = 1;
3818 			break;
3819 		}
3820 	}
3821 	rcu_read_unlock_bh();
3822 	return ret;
3823 }
3824 #endif
3825 
3826 /*
3827  *	Periodic address status verification
3828  */
3829 
3830 static void addrconf_verify_rtnl(void)
3831 {
3832 	unsigned long now, next, next_sec, next_sched;
3833 	struct inet6_ifaddr *ifp;
3834 	int i;
3835 
3836 	ASSERT_RTNL();
3837 
3838 	rcu_read_lock_bh();
3839 	now = jiffies;
3840 	next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3841 
3842 	cancel_delayed_work(&addr_chk_work);
3843 
3844 	for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3845 restart:
3846 		hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
3847 			unsigned long age;
3848 
3849 			/* When setting preferred_lft to a value not zero or
3850 			 * infinity, while valid_lft is infinity
3851 			 * IFA_F_PERMANENT has a non-infinity life time.
3852 			 */
3853 			if ((ifp->flags & IFA_F_PERMANENT) &&
3854 			    (ifp->prefered_lft == INFINITY_LIFE_TIME))
3855 				continue;
3856 
3857 			spin_lock(&ifp->lock);
3858 			/* We try to batch several events at once. */
3859 			age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3860 
3861 			if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3862 			    age >= ifp->valid_lft) {
3863 				spin_unlock(&ifp->lock);
3864 				in6_ifa_hold(ifp);
3865 				ipv6_del_addr(ifp);
3866 				goto restart;
3867 			} else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3868 				spin_unlock(&ifp->lock);
3869 				continue;
3870 			} else if (age >= ifp->prefered_lft) {
3871 				/* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3872 				int deprecate = 0;
3873 
3874 				if (!(ifp->flags&IFA_F_DEPRECATED)) {
3875 					deprecate = 1;
3876 					ifp->flags |= IFA_F_DEPRECATED;
3877 				}
3878 
3879 				if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
3880 				    (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
3881 					next = ifp->tstamp + ifp->valid_lft * HZ;
3882 
3883 				spin_unlock(&ifp->lock);
3884 
3885 				if (deprecate) {
3886 					in6_ifa_hold(ifp);
3887 
3888 					ipv6_ifa_notify(0, ifp);
3889 					in6_ifa_put(ifp);
3890 					goto restart;
3891 				}
3892 			} else if ((ifp->flags&IFA_F_TEMPORARY) &&
3893 				   !(ifp->flags&IFA_F_TENTATIVE)) {
3894 				unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3895 					ifp->idev->cnf.dad_transmits *
3896 					NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
3897 
3898 				if (age >= ifp->prefered_lft - regen_advance) {
3899 					struct inet6_ifaddr *ifpub = ifp->ifpub;
3900 					if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3901 						next = ifp->tstamp + ifp->prefered_lft * HZ;
3902 					if (!ifp->regen_count && ifpub) {
3903 						ifp->regen_count++;
3904 						in6_ifa_hold(ifp);
3905 						in6_ifa_hold(ifpub);
3906 						spin_unlock(&ifp->lock);
3907 
3908 						spin_lock(&ifpub->lock);
3909 						ifpub->regen_count = 0;
3910 						spin_unlock(&ifpub->lock);
3911 						ipv6_create_tempaddr(ifpub, ifp);
3912 						in6_ifa_put(ifpub);
3913 						in6_ifa_put(ifp);
3914 						goto restart;
3915 					}
3916 				} else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3917 					next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3918 				spin_unlock(&ifp->lock);
3919 			} else {
3920 				/* ifp->prefered_lft <= ifp->valid_lft */
3921 				if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3922 					next = ifp->tstamp + ifp->prefered_lft * HZ;
3923 				spin_unlock(&ifp->lock);
3924 			}
3925 		}
3926 	}
3927 
3928 	next_sec = round_jiffies_up(next);
3929 	next_sched = next;
3930 
3931 	/* If rounded timeout is accurate enough, accept it. */
3932 	if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3933 		next_sched = next_sec;
3934 
3935 	/* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3936 	if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3937 		next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3938 
3939 	ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3940 	      now, next, next_sec, next_sched);
3941 	mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
3942 	rcu_read_unlock_bh();
3943 }
3944 
3945 static void addrconf_verify_work(struct work_struct *w)
3946 {
3947 	rtnl_lock();
3948 	addrconf_verify_rtnl();
3949 	rtnl_unlock();
3950 }
3951 
3952 static void addrconf_verify(void)
3953 {
3954 	mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
3955 }
3956 
3957 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
3958 				     struct in6_addr **peer_pfx)
3959 {
3960 	struct in6_addr *pfx = NULL;
3961 
3962 	*peer_pfx = NULL;
3963 
3964 	if (addr)
3965 		pfx = nla_data(addr);
3966 
3967 	if (local) {
3968 		if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3969 			*peer_pfx = pfx;
3970 		pfx = nla_data(local);
3971 	}
3972 
3973 	return pfx;
3974 }
3975 
3976 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3977 	[IFA_ADDRESS]		= { .len = sizeof(struct in6_addr) },
3978 	[IFA_LOCAL]		= { .len = sizeof(struct in6_addr) },
3979 	[IFA_CACHEINFO]		= { .len = sizeof(struct ifa_cacheinfo) },
3980 	[IFA_FLAGS]		= { .len = sizeof(u32) },
3981 };
3982 
3983 static int
3984 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
3985 {
3986 	struct net *net = sock_net(skb->sk);
3987 	struct ifaddrmsg *ifm;
3988 	struct nlattr *tb[IFA_MAX+1];
3989 	struct in6_addr *pfx, *peer_pfx;
3990 	u32 ifa_flags;
3991 	int err;
3992 
3993 	err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3994 	if (err < 0)
3995 		return err;
3996 
3997 	ifm = nlmsg_data(nlh);
3998 	pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
3999 	if (!pfx)
4000 		return -EINVAL;
4001 
4002 	ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4003 
4004 	/* We ignore other flags so far. */
4005 	ifa_flags &= IFA_F_MANAGETEMPADDR;
4006 
4007 	return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4008 			      ifm->ifa_prefixlen);
4009 }
4010 
4011 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
4012 			     u32 prefered_lft, u32 valid_lft)
4013 {
4014 	u32 flags;
4015 	clock_t expires;
4016 	unsigned long timeout;
4017 	bool was_managetempaddr;
4018 	bool had_prefixroute;
4019 
4020 	ASSERT_RTNL();
4021 
4022 	if (!valid_lft || (prefered_lft > valid_lft))
4023 		return -EINVAL;
4024 
4025 	if (ifa_flags & IFA_F_MANAGETEMPADDR &&
4026 	    (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4027 		return -EINVAL;
4028 
4029 	timeout = addrconf_timeout_fixup(valid_lft, HZ);
4030 	if (addrconf_finite_timeout(timeout)) {
4031 		expires = jiffies_to_clock_t(timeout * HZ);
4032 		valid_lft = timeout;
4033 		flags = RTF_EXPIRES;
4034 	} else {
4035 		expires = 0;
4036 		flags = 0;
4037 		ifa_flags |= IFA_F_PERMANENT;
4038 	}
4039 
4040 	timeout = addrconf_timeout_fixup(prefered_lft, HZ);
4041 	if (addrconf_finite_timeout(timeout)) {
4042 		if (timeout == 0)
4043 			ifa_flags |= IFA_F_DEPRECATED;
4044 		prefered_lft = timeout;
4045 	}
4046 
4047 	spin_lock_bh(&ifp->lock);
4048 	was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
4049 	had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4050 			  !(ifp->flags & IFA_F_NOPREFIXROUTE);
4051 	ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
4052 			IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4053 			IFA_F_NOPREFIXROUTE);
4054 	ifp->flags |= ifa_flags;
4055 	ifp->tstamp = jiffies;
4056 	ifp->valid_lft = valid_lft;
4057 	ifp->prefered_lft = prefered_lft;
4058 
4059 	spin_unlock_bh(&ifp->lock);
4060 	if (!(ifp->flags&IFA_F_TENTATIVE))
4061 		ipv6_ifa_notify(0, ifp);
4062 
4063 	if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
4064 		addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
4065 				      expires, flags);
4066 	} else if (had_prefixroute) {
4067 		enum cleanup_prefix_rt_t action;
4068 		unsigned long rt_expires;
4069 
4070 		write_lock_bh(&ifp->idev->lock);
4071 		action = check_cleanup_prefix_route(ifp, &rt_expires);
4072 		write_unlock_bh(&ifp->idev->lock);
4073 
4074 		if (action != CLEANUP_PREFIX_RT_NOP) {
4075 			cleanup_prefix_route(ifp, rt_expires,
4076 				action == CLEANUP_PREFIX_RT_DEL);
4077 		}
4078 	}
4079 
4080 	if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4081 		if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
4082 			valid_lft = prefered_lft = 0;
4083 		manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
4084 				 !was_managetempaddr, jiffies);
4085 	}
4086 
4087 	addrconf_verify_rtnl();
4088 
4089 	return 0;
4090 }
4091 
4092 static int
4093 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
4094 {
4095 	struct net *net = sock_net(skb->sk);
4096 	struct ifaddrmsg *ifm;
4097 	struct nlattr *tb[IFA_MAX+1];
4098 	struct in6_addr *pfx, *peer_pfx;
4099 	struct inet6_ifaddr *ifa;
4100 	struct net_device *dev;
4101 	u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
4102 	u32 ifa_flags;
4103 	int err;
4104 
4105 	err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4106 	if (err < 0)
4107 		return err;
4108 
4109 	ifm = nlmsg_data(nlh);
4110 	pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4111 	if (!pfx)
4112 		return -EINVAL;
4113 
4114 	if (tb[IFA_CACHEINFO]) {
4115 		struct ifa_cacheinfo *ci;
4116 
4117 		ci = nla_data(tb[IFA_CACHEINFO]);
4118 		valid_lft = ci->ifa_valid;
4119 		preferred_lft = ci->ifa_prefered;
4120 	} else {
4121 		preferred_lft = INFINITY_LIFE_TIME;
4122 		valid_lft = INFINITY_LIFE_TIME;
4123 	}
4124 
4125 	dev =  __dev_get_by_index(net, ifm->ifa_index);
4126 	if (!dev)
4127 		return -ENODEV;
4128 
4129 	ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4130 
4131 	/* We ignore other flags so far. */
4132 	ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4133 		     IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN;
4134 
4135 	ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
4136 	if (!ifa) {
4137 		/*
4138 		 * It would be best to check for !NLM_F_CREATE here but
4139 		 * userspace already relies on not having to provide this.
4140 		 */
4141 		return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
4142 				      ifm->ifa_prefixlen, ifa_flags,
4143 				      preferred_lft, valid_lft);
4144 	}
4145 
4146 	if (nlh->nlmsg_flags & NLM_F_EXCL ||
4147 	    !(nlh->nlmsg_flags & NLM_F_REPLACE))
4148 		err = -EEXIST;
4149 	else
4150 		err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
4151 
4152 	in6_ifa_put(ifa);
4153 
4154 	return err;
4155 }
4156 
4157 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
4158 			  u8 scope, int ifindex)
4159 {
4160 	struct ifaddrmsg *ifm;
4161 
4162 	ifm = nlmsg_data(nlh);
4163 	ifm->ifa_family = AF_INET6;
4164 	ifm->ifa_prefixlen = prefixlen;
4165 	ifm->ifa_flags = flags;
4166 	ifm->ifa_scope = scope;
4167 	ifm->ifa_index = ifindex;
4168 }
4169 
4170 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4171 			 unsigned long tstamp, u32 preferred, u32 valid)
4172 {
4173 	struct ifa_cacheinfo ci;
4174 
4175 	ci.cstamp = cstamp_delta(cstamp);
4176 	ci.tstamp = cstamp_delta(tstamp);
4177 	ci.ifa_prefered = preferred;
4178 	ci.ifa_valid = valid;
4179 
4180 	return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4181 }
4182 
4183 static inline int rt_scope(int ifa_scope)
4184 {
4185 	if (ifa_scope & IFA_HOST)
4186 		return RT_SCOPE_HOST;
4187 	else if (ifa_scope & IFA_LINK)
4188 		return RT_SCOPE_LINK;
4189 	else if (ifa_scope & IFA_SITE)
4190 		return RT_SCOPE_SITE;
4191 	else
4192 		return RT_SCOPE_UNIVERSE;
4193 }
4194 
4195 static inline int inet6_ifaddr_msgsize(void)
4196 {
4197 	return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
4198 	       + nla_total_size(16) /* IFA_LOCAL */
4199 	       + nla_total_size(16) /* IFA_ADDRESS */
4200 	       + nla_total_size(sizeof(struct ifa_cacheinfo))
4201 	       + nla_total_size(4)  /* IFA_FLAGS */;
4202 }
4203 
4204 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
4205 			     u32 portid, u32 seq, int event, unsigned int flags)
4206 {
4207 	struct nlmsghdr  *nlh;
4208 	u32 preferred, valid;
4209 
4210 	nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4211 	if (!nlh)
4212 		return -EMSGSIZE;
4213 
4214 	put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4215 		      ifa->idev->dev->ifindex);
4216 
4217 	if (!((ifa->flags&IFA_F_PERMANENT) &&
4218 	      (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
4219 		preferred = ifa->prefered_lft;
4220 		valid = ifa->valid_lft;
4221 		if (preferred != INFINITY_LIFE_TIME) {
4222 			long tval = (jiffies - ifa->tstamp)/HZ;
4223 			if (preferred > tval)
4224 				preferred -= tval;
4225 			else
4226 				preferred = 0;
4227 			if (valid != INFINITY_LIFE_TIME) {
4228 				if (valid > tval)
4229 					valid -= tval;
4230 				else
4231 					valid = 0;
4232 			}
4233 		}
4234 	} else {
4235 		preferred = INFINITY_LIFE_TIME;
4236 		valid = INFINITY_LIFE_TIME;
4237 	}
4238 
4239 	if (!ipv6_addr_any(&ifa->peer_addr)) {
4240 		if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4241 		    nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
4242 			goto error;
4243 	} else
4244 		if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
4245 			goto error;
4246 
4247 	if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4248 		goto error;
4249 
4250 	if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4251 		goto error;
4252 
4253 	nlmsg_end(skb, nlh);
4254 	return 0;
4255 
4256 error:
4257 	nlmsg_cancel(skb, nlh);
4258 	return -EMSGSIZE;
4259 }
4260 
4261 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
4262 				u32 portid, u32 seq, int event, u16 flags)
4263 {
4264 	struct nlmsghdr  *nlh;
4265 	u8 scope = RT_SCOPE_UNIVERSE;
4266 	int ifindex = ifmca->idev->dev->ifindex;
4267 
4268 	if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4269 		scope = RT_SCOPE_SITE;
4270 
4271 	nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4272 	if (!nlh)
4273 		return -EMSGSIZE;
4274 
4275 	put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4276 	if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
4277 	    put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
4278 			  INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4279 		nlmsg_cancel(skb, nlh);
4280 		return -EMSGSIZE;
4281 	}
4282 
4283 	nlmsg_end(skb, nlh);
4284 	return 0;
4285 }
4286 
4287 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
4288 				u32 portid, u32 seq, int event, unsigned int flags)
4289 {
4290 	struct nlmsghdr  *nlh;
4291 	u8 scope = RT_SCOPE_UNIVERSE;
4292 	int ifindex = ifaca->aca_idev->dev->ifindex;
4293 
4294 	if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4295 		scope = RT_SCOPE_SITE;
4296 
4297 	nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4298 	if (!nlh)
4299 		return -EMSGSIZE;
4300 
4301 	put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4302 	if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
4303 	    put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
4304 			  INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4305 		nlmsg_cancel(skb, nlh);
4306 		return -EMSGSIZE;
4307 	}
4308 
4309 	nlmsg_end(skb, nlh);
4310 	return 0;
4311 }
4312 
4313 enum addr_type_t {
4314 	UNICAST_ADDR,
4315 	MULTICAST_ADDR,
4316 	ANYCAST_ADDR,
4317 };
4318 
4319 /* called with rcu_read_lock() */
4320 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4321 			  struct netlink_callback *cb, enum addr_type_t type,
4322 			  int s_ip_idx, int *p_ip_idx)
4323 {
4324 	struct ifmcaddr6 *ifmca;
4325 	struct ifacaddr6 *ifaca;
4326 	int err = 1;
4327 	int ip_idx = *p_ip_idx;
4328 
4329 	read_lock_bh(&idev->lock);
4330 	switch (type) {
4331 	case UNICAST_ADDR: {
4332 		struct inet6_ifaddr *ifa;
4333 
4334 		/* unicast address incl. temp addr */
4335 		list_for_each_entry(ifa, &idev->addr_list, if_list) {
4336 			if (++ip_idx < s_ip_idx)
4337 				continue;
4338 			err = inet6_fill_ifaddr(skb, ifa,
4339 						NETLINK_CB(cb->skb).portid,
4340 						cb->nlh->nlmsg_seq,
4341 						RTM_NEWADDR,
4342 						NLM_F_MULTI);
4343 			if (err < 0)
4344 				break;
4345 			nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4346 		}
4347 		break;
4348 	}
4349 	case MULTICAST_ADDR:
4350 		/* multicast address */
4351 		for (ifmca = idev->mc_list; ifmca;
4352 		     ifmca = ifmca->next, ip_idx++) {
4353 			if (ip_idx < s_ip_idx)
4354 				continue;
4355 			err = inet6_fill_ifmcaddr(skb, ifmca,
4356 						  NETLINK_CB(cb->skb).portid,
4357 						  cb->nlh->nlmsg_seq,
4358 						  RTM_GETMULTICAST,
4359 						  NLM_F_MULTI);
4360 			if (err < 0)
4361 				break;
4362 		}
4363 		break;
4364 	case ANYCAST_ADDR:
4365 		/* anycast address */
4366 		for (ifaca = idev->ac_list; ifaca;
4367 		     ifaca = ifaca->aca_next, ip_idx++) {
4368 			if (ip_idx < s_ip_idx)
4369 				continue;
4370 			err = inet6_fill_ifacaddr(skb, ifaca,
4371 						  NETLINK_CB(cb->skb).portid,
4372 						  cb->nlh->nlmsg_seq,
4373 						  RTM_GETANYCAST,
4374 						  NLM_F_MULTI);
4375 			if (err < 0)
4376 				break;
4377 		}
4378 		break;
4379 	default:
4380 		break;
4381 	}
4382 	read_unlock_bh(&idev->lock);
4383 	*p_ip_idx = ip_idx;
4384 	return err;
4385 }
4386 
4387 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4388 			   enum addr_type_t type)
4389 {
4390 	struct net *net = sock_net(skb->sk);
4391 	int h, s_h;
4392 	int idx, ip_idx;
4393 	int s_idx, s_ip_idx;
4394 	struct net_device *dev;
4395 	struct inet6_dev *idev;
4396 	struct hlist_head *head;
4397 
4398 	s_h = cb->args[0];
4399 	s_idx = idx = cb->args[1];
4400 	s_ip_idx = ip_idx = cb->args[2];
4401 
4402 	rcu_read_lock();
4403 	cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
4404 	for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4405 		idx = 0;
4406 		head = &net->dev_index_head[h];
4407 		hlist_for_each_entry_rcu(dev, head, index_hlist) {
4408 			if (idx < s_idx)
4409 				goto cont;
4410 			if (h > s_h || idx > s_idx)
4411 				s_ip_idx = 0;
4412 			ip_idx = 0;
4413 			idev = __in6_dev_get(dev);
4414 			if (!idev)
4415 				goto cont;
4416 
4417 			if (in6_dump_addrs(idev, skb, cb, type,
4418 					   s_ip_idx, &ip_idx) < 0)
4419 				goto done;
4420 cont:
4421 			idx++;
4422 		}
4423 	}
4424 done:
4425 	rcu_read_unlock();
4426 	cb->args[0] = h;
4427 	cb->args[1] = idx;
4428 	cb->args[2] = ip_idx;
4429 
4430 	return skb->len;
4431 }
4432 
4433 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4434 {
4435 	enum addr_type_t type = UNICAST_ADDR;
4436 
4437 	return inet6_dump_addr(skb, cb, type);
4438 }
4439 
4440 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4441 {
4442 	enum addr_type_t type = MULTICAST_ADDR;
4443 
4444 	return inet6_dump_addr(skb, cb, type);
4445 }
4446 
4447 
4448 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4449 {
4450 	enum addr_type_t type = ANYCAST_ADDR;
4451 
4452 	return inet6_dump_addr(skb, cb, type);
4453 }
4454 
4455 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
4456 {
4457 	struct net *net = sock_net(in_skb->sk);
4458 	struct ifaddrmsg *ifm;
4459 	struct nlattr *tb[IFA_MAX+1];
4460 	struct in6_addr *addr = NULL, *peer;
4461 	struct net_device *dev = NULL;
4462 	struct inet6_ifaddr *ifa;
4463 	struct sk_buff *skb;
4464 	int err;
4465 
4466 	err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4467 	if (err < 0)
4468 		goto errout;
4469 
4470 	addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
4471 	if (!addr) {
4472 		err = -EINVAL;
4473 		goto errout;
4474 	}
4475 
4476 	ifm = nlmsg_data(nlh);
4477 	if (ifm->ifa_index)
4478 		dev = __dev_get_by_index(net, ifm->ifa_index);
4479 
4480 	ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4481 	if (!ifa) {
4482 		err = -EADDRNOTAVAIL;
4483 		goto errout;
4484 	}
4485 
4486 	skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4487 	if (!skb) {
4488 		err = -ENOBUFS;
4489 		goto errout_ifa;
4490 	}
4491 
4492 	err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
4493 				nlh->nlmsg_seq, RTM_NEWADDR, 0);
4494 	if (err < 0) {
4495 		/* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4496 		WARN_ON(err == -EMSGSIZE);
4497 		kfree_skb(skb);
4498 		goto errout_ifa;
4499 	}
4500 	err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
4501 errout_ifa:
4502 	in6_ifa_put(ifa);
4503 errout:
4504 	return err;
4505 }
4506 
4507 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4508 {
4509 	struct sk_buff *skb;
4510 	struct net *net = dev_net(ifa->idev->dev);
4511 	int err = -ENOBUFS;
4512 
4513 	skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
4514 	if (!skb)
4515 		goto errout;
4516 
4517 	err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
4518 	if (err < 0) {
4519 		/* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4520 		WARN_ON(err == -EMSGSIZE);
4521 		kfree_skb(skb);
4522 		goto errout;
4523 	}
4524 	rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4525 	return;
4526 errout:
4527 	if (err < 0)
4528 		rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
4529 }
4530 
4531 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
4532 				__s32 *array, int bytes)
4533 {
4534 	BUG_ON(bytes < (DEVCONF_MAX * 4));
4535 
4536 	memset(array, 0, bytes);
4537 	array[DEVCONF_FORWARDING] = cnf->forwarding;
4538 	array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4539 	array[DEVCONF_MTU6] = cnf->mtu6;
4540 	array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4541 	array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4542 	array[DEVCONF_AUTOCONF] = cnf->autoconf;
4543 	array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4544 	array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
4545 	array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4546 		jiffies_to_msecs(cnf->rtr_solicit_interval);
4547 	array[DEVCONF_RTR_SOLICIT_DELAY] =
4548 		jiffies_to_msecs(cnf->rtr_solicit_delay);
4549 	array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
4550 	array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
4551 		jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
4552 	array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
4553 		jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
4554 	array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4555 	array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4556 	array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4557 	array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4558 	array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
4559 	array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
4560 	array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
4561 	array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
4562 #ifdef CONFIG_IPV6_ROUTER_PREF
4563 	array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
4564 	array[DEVCONF_RTR_PROBE_INTERVAL] =
4565 		jiffies_to_msecs(cnf->rtr_probe_interval);
4566 #ifdef CONFIG_IPV6_ROUTE_INFO
4567 	array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4568 #endif
4569 #endif
4570 	array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
4571 	array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
4572 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4573 	array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
4574 	array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
4575 #endif
4576 #ifdef CONFIG_IPV6_MROUTE
4577 	array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4578 #endif
4579 	array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
4580 	array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
4581 	array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
4582 	array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
4583 	array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
4584 	array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
4585 	array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
4586 	/* we omit DEVCONF_STABLE_SECRET for now */
4587 }
4588 
4589 static inline size_t inet6_ifla6_size(void)
4590 {
4591 	return nla_total_size(4) /* IFLA_INET6_FLAGS */
4592 	     + nla_total_size(sizeof(struct ifla_cacheinfo))
4593 	     + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4594 	     + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
4595 	     + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4596 	     + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
4597 }
4598 
4599 static inline size_t inet6_if_nlmsg_size(void)
4600 {
4601 	return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4602 	       + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4603 	       + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4604 	       + nla_total_size(4) /* IFLA_MTU */
4605 	       + nla_total_size(4) /* IFLA_LINK */
4606 	       + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
4607 }
4608 
4609 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
4610 				      int items, int bytes)
4611 {
4612 	int i;
4613 	int pad = bytes - sizeof(u64) * items;
4614 	BUG_ON(pad < 0);
4615 
4616 	/* Use put_unaligned() because stats may not be aligned for u64. */
4617 	put_unaligned(items, &stats[0]);
4618 	for (i = 1; i < items; i++)
4619 		put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
4620 
4621 	memset(&stats[items], 0, pad);
4622 }
4623 
4624 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
4625 				      int items, int bytes, size_t syncpoff)
4626 {
4627 	int i;
4628 	int pad = bytes - sizeof(u64) * items;
4629 	BUG_ON(pad < 0);
4630 
4631 	/* Use put_unaligned() because stats may not be aligned for u64. */
4632 	put_unaligned(items, &stats[0]);
4633 	for (i = 1; i < items; i++)
4634 		put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
4635 
4636 	memset(&stats[items], 0, pad);
4637 }
4638 
4639 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4640 			     int bytes)
4641 {
4642 	switch (attrtype) {
4643 	case IFLA_INET6_STATS:
4644 		__snmp6_fill_stats64(stats, idev->stats.ipv6,
4645 				     IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
4646 		break;
4647 	case IFLA_INET6_ICMP6STATS:
4648 		__snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
4649 		break;
4650 	}
4651 }
4652 
4653 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
4654 {
4655 	struct nlattr *nla;
4656 	struct ifla_cacheinfo ci;
4657 
4658 	if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4659 		goto nla_put_failure;
4660 	ci.max_reasm_len = IPV6_MAXPLEN;
4661 	ci.tstamp = cstamp_delta(idev->tstamp);
4662 	ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
4663 	ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
4664 	if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4665 		goto nla_put_failure;
4666 	nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
4667 	if (!nla)
4668 		goto nla_put_failure;
4669 	ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4670 
4671 	/* XXX - MC not implemented */
4672 
4673 	nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4674 	if (!nla)
4675 		goto nla_put_failure;
4676 	snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4677 
4678 	nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4679 	if (!nla)
4680 		goto nla_put_failure;
4681 	snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4682 
4683 	nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
4684 	if (!nla)
4685 		goto nla_put_failure;
4686 
4687 	if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->addr_gen_mode))
4688 		goto nla_put_failure;
4689 
4690 	read_lock_bh(&idev->lock);
4691 	memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
4692 	read_unlock_bh(&idev->lock);
4693 
4694 	return 0;
4695 
4696 nla_put_failure:
4697 	return -EMSGSIZE;
4698 }
4699 
4700 static size_t inet6_get_link_af_size(const struct net_device *dev)
4701 {
4702 	if (!__in6_dev_get(dev))
4703 		return 0;
4704 
4705 	return inet6_ifla6_size();
4706 }
4707 
4708 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
4709 {
4710 	struct inet6_dev *idev = __in6_dev_get(dev);
4711 
4712 	if (!idev)
4713 		return -ENODATA;
4714 
4715 	if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4716 		return -EMSGSIZE;
4717 
4718 	return 0;
4719 }
4720 
4721 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
4722 {
4723 	struct inet6_ifaddr *ifp;
4724 	struct net_device *dev = idev->dev;
4725 	bool update_rs = false;
4726 	struct in6_addr ll_addr;
4727 
4728 	ASSERT_RTNL();
4729 
4730 	if (!token)
4731 		return -EINVAL;
4732 	if (ipv6_addr_any(token))
4733 		return -EINVAL;
4734 	if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
4735 		return -EINVAL;
4736 	if (!ipv6_accept_ra(idev))
4737 		return -EINVAL;
4738 	if (idev->cnf.rtr_solicits <= 0)
4739 		return -EINVAL;
4740 
4741 	write_lock_bh(&idev->lock);
4742 
4743 	BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
4744 	memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
4745 
4746 	write_unlock_bh(&idev->lock);
4747 
4748 	if (!idev->dead && (idev->if_flags & IF_READY) &&
4749 	    !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
4750 			     IFA_F_OPTIMISTIC)) {
4751 
4752 		/* If we're not ready, then normal ifup will take care
4753 		 * of this. Otherwise, we need to request our rs here.
4754 		 */
4755 		ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
4756 		update_rs = true;
4757 	}
4758 
4759 	write_lock_bh(&idev->lock);
4760 
4761 	if (update_rs) {
4762 		idev->if_flags |= IF_RS_SENT;
4763 		idev->rs_probes = 1;
4764 		addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval);
4765 	}
4766 
4767 	/* Well, that's kinda nasty ... */
4768 	list_for_each_entry(ifp, &idev->addr_list, if_list) {
4769 		spin_lock(&ifp->lock);
4770 		if (ifp->tokenized) {
4771 			ifp->valid_lft = 0;
4772 			ifp->prefered_lft = 0;
4773 		}
4774 		spin_unlock(&ifp->lock);
4775 	}
4776 
4777 	write_unlock_bh(&idev->lock);
4778 	inet6_ifinfo_notify(RTM_NEWLINK, idev);
4779 	addrconf_verify_rtnl();
4780 	return 0;
4781 }
4782 
4783 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
4784 	[IFLA_INET6_ADDR_GEN_MODE]	= { .type = NLA_U8 },
4785 	[IFLA_INET6_TOKEN]		= { .len = sizeof(struct in6_addr) },
4786 };
4787 
4788 static int inet6_validate_link_af(const struct net_device *dev,
4789 				  const struct nlattr *nla)
4790 {
4791 	struct nlattr *tb[IFLA_INET6_MAX + 1];
4792 
4793 	if (dev && !__in6_dev_get(dev))
4794 		return -EAFNOSUPPORT;
4795 
4796 	return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy);
4797 }
4798 
4799 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
4800 {
4801 	int err = -EINVAL;
4802 	struct inet6_dev *idev = __in6_dev_get(dev);
4803 	struct nlattr *tb[IFLA_INET6_MAX + 1];
4804 
4805 	if (!idev)
4806 		return -EAFNOSUPPORT;
4807 
4808 	if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
4809 		BUG();
4810 
4811 	if (tb[IFLA_INET6_TOKEN]) {
4812 		err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
4813 		if (err)
4814 			return err;
4815 	}
4816 
4817 	if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
4818 		u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
4819 
4820 		if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
4821 		    mode != IN6_ADDR_GEN_MODE_NONE &&
4822 		    mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY)
4823 			return -EINVAL;
4824 
4825 		if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
4826 		    !idev->cnf.stable_secret.initialized &&
4827 		    !dev_net(dev)->ipv6.devconf_dflt->stable_secret.initialized)
4828 			return -EINVAL;
4829 
4830 		idev->addr_gen_mode = mode;
4831 		err = 0;
4832 	}
4833 
4834 	return err;
4835 }
4836 
4837 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
4838 			     u32 portid, u32 seq, int event, unsigned int flags)
4839 {
4840 	struct net_device *dev = idev->dev;
4841 	struct ifinfomsg *hdr;
4842 	struct nlmsghdr *nlh;
4843 	void *protoinfo;
4844 
4845 	nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
4846 	if (!nlh)
4847 		return -EMSGSIZE;
4848 
4849 	hdr = nlmsg_data(nlh);
4850 	hdr->ifi_family = AF_INET6;
4851 	hdr->__ifi_pad = 0;
4852 	hdr->ifi_type = dev->type;
4853 	hdr->ifi_index = dev->ifindex;
4854 	hdr->ifi_flags = dev_get_flags(dev);
4855 	hdr->ifi_change = 0;
4856 
4857 	if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4858 	    (dev->addr_len &&
4859 	     nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4860 	    nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4861 	    (dev->ifindex != dev_get_iflink(dev) &&
4862 	     nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))))
4863 		goto nla_put_failure;
4864 	protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4865 	if (!protoinfo)
4866 		goto nla_put_failure;
4867 
4868 	if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4869 		goto nla_put_failure;
4870 
4871 	nla_nest_end(skb, protoinfo);
4872 	nlmsg_end(skb, nlh);
4873 	return 0;
4874 
4875 nla_put_failure:
4876 	nlmsg_cancel(skb, nlh);
4877 	return -EMSGSIZE;
4878 }
4879 
4880 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4881 {
4882 	struct net *net = sock_net(skb->sk);
4883 	int h, s_h;
4884 	int idx = 0, s_idx;
4885 	struct net_device *dev;
4886 	struct inet6_dev *idev;
4887 	struct hlist_head *head;
4888 
4889 	s_h = cb->args[0];
4890 	s_idx = cb->args[1];
4891 
4892 	rcu_read_lock();
4893 	for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4894 		idx = 0;
4895 		head = &net->dev_index_head[h];
4896 		hlist_for_each_entry_rcu(dev, head, index_hlist) {
4897 			if (idx < s_idx)
4898 				goto cont;
4899 			idev = __in6_dev_get(dev);
4900 			if (!idev)
4901 				goto cont;
4902 			if (inet6_fill_ifinfo(skb, idev,
4903 					      NETLINK_CB(cb->skb).portid,
4904 					      cb->nlh->nlmsg_seq,
4905 					      RTM_NEWLINK, NLM_F_MULTI) < 0)
4906 				goto out;
4907 cont:
4908 			idx++;
4909 		}
4910 	}
4911 out:
4912 	rcu_read_unlock();
4913 	cb->args[1] = idx;
4914 	cb->args[0] = h;
4915 
4916 	return skb->len;
4917 }
4918 
4919 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4920 {
4921 	struct sk_buff *skb;
4922 	struct net *net = dev_net(idev->dev);
4923 	int err = -ENOBUFS;
4924 
4925 	skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
4926 	if (!skb)
4927 		goto errout;
4928 
4929 	err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
4930 	if (err < 0) {
4931 		/* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4932 		WARN_ON(err == -EMSGSIZE);
4933 		kfree_skb(skb);
4934 		goto errout;
4935 	}
4936 	rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
4937 	return;
4938 errout:
4939 	if (err < 0)
4940 		rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
4941 }
4942 
4943 static inline size_t inet6_prefix_nlmsg_size(void)
4944 {
4945 	return NLMSG_ALIGN(sizeof(struct prefixmsg))
4946 	       + nla_total_size(sizeof(struct in6_addr))
4947 	       + nla_total_size(sizeof(struct prefix_cacheinfo));
4948 }
4949 
4950 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
4951 			     struct prefix_info *pinfo, u32 portid, u32 seq,
4952 			     int event, unsigned int flags)
4953 {
4954 	struct prefixmsg *pmsg;
4955 	struct nlmsghdr *nlh;
4956 	struct prefix_cacheinfo	ci;
4957 
4958 	nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
4959 	if (!nlh)
4960 		return -EMSGSIZE;
4961 
4962 	pmsg = nlmsg_data(nlh);
4963 	pmsg->prefix_family = AF_INET6;
4964 	pmsg->prefix_pad1 = 0;
4965 	pmsg->prefix_pad2 = 0;
4966 	pmsg->prefix_ifindex = idev->dev->ifindex;
4967 	pmsg->prefix_len = pinfo->prefix_len;
4968 	pmsg->prefix_type = pinfo->type;
4969 	pmsg->prefix_pad3 = 0;
4970 	pmsg->prefix_flags = 0;
4971 	if (pinfo->onlink)
4972 		pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4973 	if (pinfo->autoconf)
4974 		pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4975 
4976 	if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
4977 		goto nla_put_failure;
4978 	ci.preferred_time = ntohl(pinfo->prefered);
4979 	ci.valid_time = ntohl(pinfo->valid);
4980 	if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
4981 		goto nla_put_failure;
4982 	nlmsg_end(skb, nlh);
4983 	return 0;
4984 
4985 nla_put_failure:
4986 	nlmsg_cancel(skb, nlh);
4987 	return -EMSGSIZE;
4988 }
4989 
4990 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
4991 			 struct prefix_info *pinfo)
4992 {
4993 	struct sk_buff *skb;
4994 	struct net *net = dev_net(idev->dev);
4995 	int err = -ENOBUFS;
4996 
4997 	skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
4998 	if (!skb)
4999 		goto errout;
5000 
5001 	err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
5002 	if (err < 0) {
5003 		/* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
5004 		WARN_ON(err == -EMSGSIZE);
5005 		kfree_skb(skb);
5006 		goto errout;
5007 	}
5008 	rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
5009 	return;
5010 errout:
5011 	if (err < 0)
5012 		rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
5013 }
5014 
5015 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5016 {
5017 	struct net *net = dev_net(ifp->idev->dev);
5018 
5019 	if (event)
5020 		ASSERT_RTNL();
5021 
5022 	inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
5023 
5024 	switch (event) {
5025 	case RTM_NEWADDR:
5026 		/*
5027 		 * If the address was optimistic
5028 		 * we inserted the route at the start of
5029 		 * our DAD process, so we don't need
5030 		 * to do it again
5031 		 */
5032 		if (!(ifp->rt->rt6i_node))
5033 			ip6_ins_rt(ifp->rt);
5034 		if (ifp->idev->cnf.forwarding)
5035 			addrconf_join_anycast(ifp);
5036 		if (!ipv6_addr_any(&ifp->peer_addr))
5037 			addrconf_prefix_route(&ifp->peer_addr, 128,
5038 					      ifp->idev->dev, 0, 0);
5039 		break;
5040 	case RTM_DELADDR:
5041 		if (ifp->idev->cnf.forwarding)
5042 			addrconf_leave_anycast(ifp);
5043 		addrconf_leave_solict(ifp->idev, &ifp->addr);
5044 		if (!ipv6_addr_any(&ifp->peer_addr)) {
5045 			struct rt6_info *rt;
5046 
5047 			rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
5048 						       ifp->idev->dev, 0, 0);
5049 			if (rt && ip6_del_rt(rt))
5050 				dst_free(&rt->dst);
5051 		}
5052 		dst_hold(&ifp->rt->dst);
5053 
5054 		if (ip6_del_rt(ifp->rt))
5055 			dst_free(&ifp->rt->dst);
5056 
5057 		rt_genid_bump_ipv6(net);
5058 		break;
5059 	}
5060 	atomic_inc(&net->ipv6.dev_addr_genid);
5061 }
5062 
5063 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5064 {
5065 	rcu_read_lock_bh();
5066 	if (likely(ifp->idev->dead == 0))
5067 		__ipv6_ifa_notify(event, ifp);
5068 	rcu_read_unlock_bh();
5069 }
5070 
5071 #ifdef CONFIG_SYSCTL
5072 
5073 static
5074 int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
5075 			   void __user *buffer, size_t *lenp, loff_t *ppos)
5076 {
5077 	int *valp = ctl->data;
5078 	int val = *valp;
5079 	loff_t pos = *ppos;
5080 	struct ctl_table lctl;
5081 	int ret;
5082 
5083 	/*
5084 	 * ctl->data points to idev->cnf.forwarding, we should
5085 	 * not modify it until we get the rtnl lock.
5086 	 */
5087 	lctl = *ctl;
5088 	lctl.data = &val;
5089 
5090 	ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5091 
5092 	if (write)
5093 		ret = addrconf_fixup_forwarding(ctl, valp, val);
5094 	if (ret)
5095 		*ppos = pos;
5096 	return ret;
5097 }
5098 
5099 static
5100 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
5101 			void __user *buffer, size_t *lenp, loff_t *ppos)
5102 {
5103 	struct inet6_dev *idev = ctl->extra1;
5104 	int min_mtu = IPV6_MIN_MTU;
5105 	struct ctl_table lctl;
5106 
5107 	lctl = *ctl;
5108 	lctl.extra1 = &min_mtu;
5109 	lctl.extra2 = idev ? &idev->dev->mtu : NULL;
5110 
5111 	return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5112 }
5113 
5114 static void dev_disable_change(struct inet6_dev *idev)
5115 {
5116 	struct netdev_notifier_info info;
5117 
5118 	if (!idev || !idev->dev)
5119 		return;
5120 
5121 	netdev_notifier_info_init(&info, idev->dev);
5122 	if (idev->cnf.disable_ipv6)
5123 		addrconf_notify(NULL, NETDEV_DOWN, &info);
5124 	else
5125 		addrconf_notify(NULL, NETDEV_UP, &info);
5126 }
5127 
5128 static void addrconf_disable_change(struct net *net, __s32 newf)
5129 {
5130 	struct net_device *dev;
5131 	struct inet6_dev *idev;
5132 
5133 	rcu_read_lock();
5134 	for_each_netdev_rcu(net, dev) {
5135 		idev = __in6_dev_get(dev);
5136 		if (idev) {
5137 			int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
5138 			idev->cnf.disable_ipv6 = newf;
5139 			if (changed)
5140 				dev_disable_change(idev);
5141 		}
5142 	}
5143 	rcu_read_unlock();
5144 }
5145 
5146 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
5147 {
5148 	struct net *net;
5149 	int old;
5150 
5151 	if (!rtnl_trylock())
5152 		return restart_syscall();
5153 
5154 	net = (struct net *)table->extra2;
5155 	old = *p;
5156 	*p = newf;
5157 
5158 	if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
5159 		rtnl_unlock();
5160 		return 0;
5161 	}
5162 
5163 	if (p == &net->ipv6.devconf_all->disable_ipv6) {
5164 		net->ipv6.devconf_dflt->disable_ipv6 = newf;
5165 		addrconf_disable_change(net, newf);
5166 	} else if ((!newf) ^ (!old))
5167 		dev_disable_change((struct inet6_dev *)table->extra1);
5168 
5169 	rtnl_unlock();
5170 	return 0;
5171 }
5172 
5173 static
5174 int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
5175 			    void __user *buffer, size_t *lenp, loff_t *ppos)
5176 {
5177 	int *valp = ctl->data;
5178 	int val = *valp;
5179 	loff_t pos = *ppos;
5180 	struct ctl_table lctl;
5181 	int ret;
5182 
5183 	/*
5184 	 * ctl->data points to idev->cnf.disable_ipv6, we should
5185 	 * not modify it until we get the rtnl lock.
5186 	 */
5187 	lctl = *ctl;
5188 	lctl.data = &val;
5189 
5190 	ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5191 
5192 	if (write)
5193 		ret = addrconf_disable_ipv6(ctl, valp, val);
5194 	if (ret)
5195 		*ppos = pos;
5196 	return ret;
5197 }
5198 
5199 static
5200 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
5201 			      void __user *buffer, size_t *lenp, loff_t *ppos)
5202 {
5203 	int *valp = ctl->data;
5204 	int ret;
5205 	int old, new;
5206 
5207 	old = *valp;
5208 	ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5209 	new = *valp;
5210 
5211 	if (write && old != new) {
5212 		struct net *net = ctl->extra2;
5213 
5214 		if (!rtnl_trylock())
5215 			return restart_syscall();
5216 
5217 		if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
5218 			inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5219 						     NETCONFA_IFINDEX_DEFAULT,
5220 						     net->ipv6.devconf_dflt);
5221 		else if (valp == &net->ipv6.devconf_all->proxy_ndp)
5222 			inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5223 						     NETCONFA_IFINDEX_ALL,
5224 						     net->ipv6.devconf_all);
5225 		else {
5226 			struct inet6_dev *idev = ctl->extra1;
5227 
5228 			inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5229 						     idev->dev->ifindex,
5230 						     &idev->cnf);
5231 		}
5232 		rtnl_unlock();
5233 	}
5234 
5235 	return ret;
5236 }
5237 
5238 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
5239 					 void __user *buffer, size_t *lenp,
5240 					 loff_t *ppos)
5241 {
5242 	int err;
5243 	struct in6_addr addr;
5244 	char str[IPV6_MAX_STRLEN];
5245 	struct ctl_table lctl = *ctl;
5246 	struct net *net = ctl->extra2;
5247 	struct ipv6_stable_secret *secret = ctl->data;
5248 
5249 	if (&net->ipv6.devconf_all->stable_secret == ctl->data)
5250 		return -EIO;
5251 
5252 	lctl.maxlen = IPV6_MAX_STRLEN;
5253 	lctl.data = str;
5254 
5255 	if (!rtnl_trylock())
5256 		return restart_syscall();
5257 
5258 	if (!write && !secret->initialized) {
5259 		err = -EIO;
5260 		goto out;
5261 	}
5262 
5263 	if (!write) {
5264 		err = snprintf(str, sizeof(str), "%pI6",
5265 			       &secret->secret);
5266 		if (err >= sizeof(str)) {
5267 			err = -EIO;
5268 			goto out;
5269 		}
5270 	}
5271 
5272 	err = proc_dostring(&lctl, write, buffer, lenp, ppos);
5273 	if (err || !write)
5274 		goto out;
5275 
5276 	if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
5277 		err = -EIO;
5278 		goto out;
5279 	}
5280 
5281 	secret->initialized = true;
5282 	secret->secret = addr;
5283 
5284 	if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
5285 		struct net_device *dev;
5286 
5287 		for_each_netdev(net, dev) {
5288 			struct inet6_dev *idev = __in6_dev_get(dev);
5289 
5290 			if (idev) {
5291 				idev->addr_gen_mode =
5292 					IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5293 			}
5294 		}
5295 	} else {
5296 		struct inet6_dev *idev = ctl->extra1;
5297 
5298 		idev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5299 	}
5300 
5301 out:
5302 	rtnl_unlock();
5303 
5304 	return err;
5305 }
5306 
5307 static struct addrconf_sysctl_table
5308 {
5309 	struct ctl_table_header *sysctl_header;
5310 	struct ctl_table addrconf_vars[DEVCONF_MAX+1];
5311 } addrconf_sysctl __read_mostly = {
5312 	.sysctl_header = NULL,
5313 	.addrconf_vars = {
5314 		{
5315 			.procname	= "forwarding",
5316 			.data		= &ipv6_devconf.forwarding,
5317 			.maxlen		= sizeof(int),
5318 			.mode		= 0644,
5319 			.proc_handler	= addrconf_sysctl_forward,
5320 		},
5321 		{
5322 			.procname	= "hop_limit",
5323 			.data		= &ipv6_devconf.hop_limit,
5324 			.maxlen		= sizeof(int),
5325 			.mode		= 0644,
5326 			.proc_handler	= proc_dointvec,
5327 		},
5328 		{
5329 			.procname	= "mtu",
5330 			.data		= &ipv6_devconf.mtu6,
5331 			.maxlen		= sizeof(int),
5332 			.mode		= 0644,
5333 			.proc_handler	= addrconf_sysctl_mtu,
5334 		},
5335 		{
5336 			.procname	= "accept_ra",
5337 			.data		= &ipv6_devconf.accept_ra,
5338 			.maxlen		= sizeof(int),
5339 			.mode		= 0644,
5340 			.proc_handler	= proc_dointvec,
5341 		},
5342 		{
5343 			.procname	= "accept_redirects",
5344 			.data		= &ipv6_devconf.accept_redirects,
5345 			.maxlen		= sizeof(int),
5346 			.mode		= 0644,
5347 			.proc_handler	= proc_dointvec,
5348 		},
5349 		{
5350 			.procname	= "autoconf",
5351 			.data		= &ipv6_devconf.autoconf,
5352 			.maxlen		= sizeof(int),
5353 			.mode		= 0644,
5354 			.proc_handler	= proc_dointvec,
5355 		},
5356 		{
5357 			.procname	= "dad_transmits",
5358 			.data		= &ipv6_devconf.dad_transmits,
5359 			.maxlen		= sizeof(int),
5360 			.mode		= 0644,
5361 			.proc_handler	= proc_dointvec,
5362 		},
5363 		{
5364 			.procname	= "router_solicitations",
5365 			.data		= &ipv6_devconf.rtr_solicits,
5366 			.maxlen		= sizeof(int),
5367 			.mode		= 0644,
5368 			.proc_handler	= proc_dointvec,
5369 		},
5370 		{
5371 			.procname	= "router_solicitation_interval",
5372 			.data		= &ipv6_devconf.rtr_solicit_interval,
5373 			.maxlen		= sizeof(int),
5374 			.mode		= 0644,
5375 			.proc_handler	= proc_dointvec_jiffies,
5376 		},
5377 		{
5378 			.procname	= "router_solicitation_delay",
5379 			.data		= &ipv6_devconf.rtr_solicit_delay,
5380 			.maxlen		= sizeof(int),
5381 			.mode		= 0644,
5382 			.proc_handler	= proc_dointvec_jiffies,
5383 		},
5384 		{
5385 			.procname	= "force_mld_version",
5386 			.data		= &ipv6_devconf.force_mld_version,
5387 			.maxlen		= sizeof(int),
5388 			.mode		= 0644,
5389 			.proc_handler	= proc_dointvec,
5390 		},
5391 		{
5392 			.procname	= "mldv1_unsolicited_report_interval",
5393 			.data		=
5394 				&ipv6_devconf.mldv1_unsolicited_report_interval,
5395 			.maxlen		= sizeof(int),
5396 			.mode		= 0644,
5397 			.proc_handler	= proc_dointvec_ms_jiffies,
5398 		},
5399 		{
5400 			.procname	= "mldv2_unsolicited_report_interval",
5401 			.data		=
5402 				&ipv6_devconf.mldv2_unsolicited_report_interval,
5403 			.maxlen		= sizeof(int),
5404 			.mode		= 0644,
5405 			.proc_handler	= proc_dointvec_ms_jiffies,
5406 		},
5407 		{
5408 			.procname	= "use_tempaddr",
5409 			.data		= &ipv6_devconf.use_tempaddr,
5410 			.maxlen		= sizeof(int),
5411 			.mode		= 0644,
5412 			.proc_handler	= proc_dointvec,
5413 		},
5414 		{
5415 			.procname	= "temp_valid_lft",
5416 			.data		= &ipv6_devconf.temp_valid_lft,
5417 			.maxlen		= sizeof(int),
5418 			.mode		= 0644,
5419 			.proc_handler	= proc_dointvec,
5420 		},
5421 		{
5422 			.procname	= "temp_prefered_lft",
5423 			.data		= &ipv6_devconf.temp_prefered_lft,
5424 			.maxlen		= sizeof(int),
5425 			.mode		= 0644,
5426 			.proc_handler	= proc_dointvec,
5427 		},
5428 		{
5429 			.procname	= "regen_max_retry",
5430 			.data		= &ipv6_devconf.regen_max_retry,
5431 			.maxlen		= sizeof(int),
5432 			.mode		= 0644,
5433 			.proc_handler	= proc_dointvec,
5434 		},
5435 		{
5436 			.procname	= "max_desync_factor",
5437 			.data		= &ipv6_devconf.max_desync_factor,
5438 			.maxlen		= sizeof(int),
5439 			.mode		= 0644,
5440 			.proc_handler	= proc_dointvec,
5441 		},
5442 		{
5443 			.procname	= "max_addresses",
5444 			.data		= &ipv6_devconf.max_addresses,
5445 			.maxlen		= sizeof(int),
5446 			.mode		= 0644,
5447 			.proc_handler	= proc_dointvec,
5448 		},
5449 		{
5450 			.procname	= "accept_ra_defrtr",
5451 			.data		= &ipv6_devconf.accept_ra_defrtr,
5452 			.maxlen		= sizeof(int),
5453 			.mode		= 0644,
5454 			.proc_handler	= proc_dointvec,
5455 		},
5456 		{
5457 			.procname	= "accept_ra_pinfo",
5458 			.data		= &ipv6_devconf.accept_ra_pinfo,
5459 			.maxlen		= sizeof(int),
5460 			.mode		= 0644,
5461 			.proc_handler	= proc_dointvec,
5462 		},
5463 #ifdef CONFIG_IPV6_ROUTER_PREF
5464 		{
5465 			.procname	= "accept_ra_rtr_pref",
5466 			.data		= &ipv6_devconf.accept_ra_rtr_pref,
5467 			.maxlen		= sizeof(int),
5468 			.mode		= 0644,
5469 			.proc_handler	= proc_dointvec,
5470 		},
5471 		{
5472 			.procname	= "router_probe_interval",
5473 			.data		= &ipv6_devconf.rtr_probe_interval,
5474 			.maxlen		= sizeof(int),
5475 			.mode		= 0644,
5476 			.proc_handler	= proc_dointvec_jiffies,
5477 		},
5478 #ifdef CONFIG_IPV6_ROUTE_INFO
5479 		{
5480 			.procname	= "accept_ra_rt_info_max_plen",
5481 			.data		= &ipv6_devconf.accept_ra_rt_info_max_plen,
5482 			.maxlen		= sizeof(int),
5483 			.mode		= 0644,
5484 			.proc_handler	= proc_dointvec,
5485 		},
5486 #endif
5487 #endif
5488 		{
5489 			.procname	= "proxy_ndp",
5490 			.data		= &ipv6_devconf.proxy_ndp,
5491 			.maxlen		= sizeof(int),
5492 			.mode		= 0644,
5493 			.proc_handler	= addrconf_sysctl_proxy_ndp,
5494 		},
5495 		{
5496 			.procname	= "accept_source_route",
5497 			.data		= &ipv6_devconf.accept_source_route,
5498 			.maxlen		= sizeof(int),
5499 			.mode		= 0644,
5500 			.proc_handler	= proc_dointvec,
5501 		},
5502 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5503 		{
5504 			.procname       = "optimistic_dad",
5505 			.data           = &ipv6_devconf.optimistic_dad,
5506 			.maxlen         = sizeof(int),
5507 			.mode           = 0644,
5508 			.proc_handler   = proc_dointvec,
5509 
5510 		},
5511 		{
5512 			.procname       = "use_optimistic",
5513 			.data           = &ipv6_devconf.use_optimistic,
5514 			.maxlen         = sizeof(int),
5515 			.mode           = 0644,
5516 			.proc_handler   = proc_dointvec,
5517 
5518 		},
5519 #endif
5520 #ifdef CONFIG_IPV6_MROUTE
5521 		{
5522 			.procname	= "mc_forwarding",
5523 			.data		= &ipv6_devconf.mc_forwarding,
5524 			.maxlen		= sizeof(int),
5525 			.mode		= 0444,
5526 			.proc_handler	= proc_dointvec,
5527 		},
5528 #endif
5529 		{
5530 			.procname	= "disable_ipv6",
5531 			.data		= &ipv6_devconf.disable_ipv6,
5532 			.maxlen		= sizeof(int),
5533 			.mode		= 0644,
5534 			.proc_handler	= addrconf_sysctl_disable,
5535 		},
5536 		{
5537 			.procname	= "accept_dad",
5538 			.data		= &ipv6_devconf.accept_dad,
5539 			.maxlen		= sizeof(int),
5540 			.mode		= 0644,
5541 			.proc_handler	= proc_dointvec,
5542 		},
5543 		{
5544 			.procname       = "force_tllao",
5545 			.data           = &ipv6_devconf.force_tllao,
5546 			.maxlen         = sizeof(int),
5547 			.mode           = 0644,
5548 			.proc_handler   = proc_dointvec
5549 		},
5550 		{
5551 			.procname       = "ndisc_notify",
5552 			.data           = &ipv6_devconf.ndisc_notify,
5553 			.maxlen         = sizeof(int),
5554 			.mode           = 0644,
5555 			.proc_handler   = proc_dointvec
5556 		},
5557 		{
5558 			.procname	= "suppress_frag_ndisc",
5559 			.data		= &ipv6_devconf.suppress_frag_ndisc,
5560 			.maxlen		= sizeof(int),
5561 			.mode		= 0644,
5562 			.proc_handler	= proc_dointvec
5563 		},
5564 		{
5565 			.procname	= "accept_ra_from_local",
5566 			.data		= &ipv6_devconf.accept_ra_from_local,
5567 			.maxlen		= sizeof(int),
5568 			.mode		= 0644,
5569 			.proc_handler	= proc_dointvec,
5570 		},
5571 		{
5572 			.procname	= "accept_ra_mtu",
5573 			.data		= &ipv6_devconf.accept_ra_mtu,
5574 			.maxlen		= sizeof(int),
5575 			.mode		= 0644,
5576 			.proc_handler	= proc_dointvec,
5577 		},
5578 		{
5579 			.procname	= "stable_secret",
5580 			.data		= &ipv6_devconf.stable_secret,
5581 			.maxlen		= IPV6_MAX_STRLEN,
5582 			.mode		= 0600,
5583 			.proc_handler	= addrconf_sysctl_stable_secret,
5584 		},
5585 		{
5586 			/* sentinel */
5587 		}
5588 	},
5589 };
5590 
5591 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
5592 		struct inet6_dev *idev, struct ipv6_devconf *p)
5593 {
5594 	int i;
5595 	struct addrconf_sysctl_table *t;
5596 	char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
5597 
5598 	t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
5599 	if (!t)
5600 		goto out;
5601 
5602 	for (i = 0; t->addrconf_vars[i].data; i++) {
5603 		t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
5604 		t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
5605 		t->addrconf_vars[i].extra2 = net;
5606 	}
5607 
5608 	snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
5609 
5610 	t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
5611 	if (!t->sysctl_header)
5612 		goto free;
5613 
5614 	p->sysctl = t;
5615 	return 0;
5616 
5617 free:
5618 	kfree(t);
5619 out:
5620 	return -ENOBUFS;
5621 }
5622 
5623 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
5624 {
5625 	struct addrconf_sysctl_table *t;
5626 
5627 	if (!p->sysctl)
5628 		return;
5629 
5630 	t = p->sysctl;
5631 	p->sysctl = NULL;
5632 	unregister_net_sysctl_table(t->sysctl_header);
5633 	kfree(t);
5634 }
5635 
5636 static int addrconf_sysctl_register(struct inet6_dev *idev)
5637 {
5638 	int err;
5639 
5640 	if (!sysctl_dev_name_is_allowed(idev->dev->name))
5641 		return -EINVAL;
5642 
5643 	err = neigh_sysctl_register(idev->dev, idev->nd_parms,
5644 				    &ndisc_ifinfo_sysctl_change);
5645 	if (err)
5646 		return err;
5647 	err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
5648 					 idev, &idev->cnf);
5649 	if (err)
5650 		neigh_sysctl_unregister(idev->nd_parms);
5651 
5652 	return err;
5653 }
5654 
5655 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
5656 {
5657 	__addrconf_sysctl_unregister(&idev->cnf);
5658 	neigh_sysctl_unregister(idev->nd_parms);
5659 }
5660 
5661 
5662 #endif
5663 
5664 static int __net_init addrconf_init_net(struct net *net)
5665 {
5666 	int err = -ENOMEM;
5667 	struct ipv6_devconf *all, *dflt;
5668 
5669 	all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
5670 	if (!all)
5671 		goto err_alloc_all;
5672 
5673 	dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
5674 	if (!dflt)
5675 		goto err_alloc_dflt;
5676 
5677 	/* these will be inherited by all namespaces */
5678 	dflt->autoconf = ipv6_defaults.autoconf;
5679 	dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
5680 
5681 	dflt->stable_secret.initialized = false;
5682 	all->stable_secret.initialized = false;
5683 
5684 	net->ipv6.devconf_all = all;
5685 	net->ipv6.devconf_dflt = dflt;
5686 
5687 #ifdef CONFIG_SYSCTL
5688 	err = __addrconf_sysctl_register(net, "all", NULL, all);
5689 	if (err < 0)
5690 		goto err_reg_all;
5691 
5692 	err = __addrconf_sysctl_register(net, "default", NULL, dflt);
5693 	if (err < 0)
5694 		goto err_reg_dflt;
5695 #endif
5696 	return 0;
5697 
5698 #ifdef CONFIG_SYSCTL
5699 err_reg_dflt:
5700 	__addrconf_sysctl_unregister(all);
5701 err_reg_all:
5702 	kfree(dflt);
5703 #endif
5704 err_alloc_dflt:
5705 	kfree(all);
5706 err_alloc_all:
5707 	return err;
5708 }
5709 
5710 static void __net_exit addrconf_exit_net(struct net *net)
5711 {
5712 #ifdef CONFIG_SYSCTL
5713 	__addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
5714 	__addrconf_sysctl_unregister(net->ipv6.devconf_all);
5715 #endif
5716 	kfree(net->ipv6.devconf_dflt);
5717 	kfree(net->ipv6.devconf_all);
5718 }
5719 
5720 static struct pernet_operations addrconf_ops = {
5721 	.init = addrconf_init_net,
5722 	.exit = addrconf_exit_net,
5723 };
5724 
5725 static struct rtnl_af_ops inet6_ops __read_mostly = {
5726 	.family		  = AF_INET6,
5727 	.fill_link_af	  = inet6_fill_link_af,
5728 	.get_link_af_size = inet6_get_link_af_size,
5729 	.validate_link_af = inet6_validate_link_af,
5730 	.set_link_af	  = inet6_set_link_af,
5731 };
5732 
5733 /*
5734  *	Init / cleanup code
5735  */
5736 
5737 int __init addrconf_init(void)
5738 {
5739 	struct inet6_dev *idev;
5740 	int i, err;
5741 
5742 	err = ipv6_addr_label_init();
5743 	if (err < 0) {
5744 		pr_crit("%s: cannot initialize default policy table: %d\n",
5745 			__func__, err);
5746 		goto out;
5747 	}
5748 
5749 	err = register_pernet_subsys(&addrconf_ops);
5750 	if (err < 0)
5751 		goto out_addrlabel;
5752 
5753 	addrconf_wq = create_workqueue("ipv6_addrconf");
5754 	if (!addrconf_wq) {
5755 		err = -ENOMEM;
5756 		goto out_nowq;
5757 	}
5758 
5759 	/* The addrconf netdev notifier requires that loopback_dev
5760 	 * has it's ipv6 private information allocated and setup
5761 	 * before it can bring up and give link-local addresses
5762 	 * to other devices which are up.
5763 	 *
5764 	 * Unfortunately, loopback_dev is not necessarily the first
5765 	 * entry in the global dev_base list of net devices.  In fact,
5766 	 * it is likely to be the very last entry on that list.
5767 	 * So this causes the notifier registry below to try and
5768 	 * give link-local addresses to all devices besides loopback_dev
5769 	 * first, then loopback_dev, which cases all the non-loopback_dev
5770 	 * devices to fail to get a link-local address.
5771 	 *
5772 	 * So, as a temporary fix, allocate the ipv6 structure for
5773 	 * loopback_dev first by hand.
5774 	 * Longer term, all of the dependencies ipv6 has upon the loopback
5775 	 * device and it being up should be removed.
5776 	 */
5777 	rtnl_lock();
5778 	idev = ipv6_add_dev(init_net.loopback_dev);
5779 	rtnl_unlock();
5780 	if (IS_ERR(idev)) {
5781 		err = PTR_ERR(idev);
5782 		goto errlo;
5783 	}
5784 
5785 	for (i = 0; i < IN6_ADDR_HSIZE; i++)
5786 		INIT_HLIST_HEAD(&inet6_addr_lst[i]);
5787 
5788 	register_netdevice_notifier(&ipv6_dev_notf);
5789 
5790 	addrconf_verify();
5791 
5792 	rtnl_af_register(&inet6_ops);
5793 
5794 	err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
5795 			      NULL);
5796 	if (err < 0)
5797 		goto errout;
5798 
5799 	/* Only the first call to __rtnl_register can fail */
5800 	__rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
5801 	__rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
5802 	__rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
5803 			inet6_dump_ifaddr, NULL);
5804 	__rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
5805 			inet6_dump_ifmcaddr, NULL);
5806 	__rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
5807 			inet6_dump_ifacaddr, NULL);
5808 	__rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
5809 			inet6_netconf_dump_devconf, NULL);
5810 
5811 	ipv6_addr_label_rtnl_register();
5812 
5813 	return 0;
5814 errout:
5815 	rtnl_af_unregister(&inet6_ops);
5816 	unregister_netdevice_notifier(&ipv6_dev_notf);
5817 errlo:
5818 	destroy_workqueue(addrconf_wq);
5819 out_nowq:
5820 	unregister_pernet_subsys(&addrconf_ops);
5821 out_addrlabel:
5822 	ipv6_addr_label_cleanup();
5823 out:
5824 	return err;
5825 }
5826 
5827 void addrconf_cleanup(void)
5828 {
5829 	struct net_device *dev;
5830 	int i;
5831 
5832 	unregister_netdevice_notifier(&ipv6_dev_notf);
5833 	unregister_pernet_subsys(&addrconf_ops);
5834 	ipv6_addr_label_cleanup();
5835 
5836 	rtnl_lock();
5837 
5838 	__rtnl_af_unregister(&inet6_ops);
5839 
5840 	/* clean dev list */
5841 	for_each_netdev(&init_net, dev) {
5842 		if (__in6_dev_get(dev) == NULL)
5843 			continue;
5844 		addrconf_ifdown(dev, 1);
5845 	}
5846 	addrconf_ifdown(init_net.loopback_dev, 2);
5847 
5848 	/*
5849 	 *	Check hash table.
5850 	 */
5851 	spin_lock_bh(&addrconf_hash_lock);
5852 	for (i = 0; i < IN6_ADDR_HSIZE; i++)
5853 		WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5854 	spin_unlock_bh(&addrconf_hash_lock);
5855 	cancel_delayed_work(&addr_chk_work);
5856 	rtnl_unlock();
5857 
5858 	destroy_workqueue(addrconf_wq);
5859 }
5860