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/in6.h>
  50#include <linux/netdevice.h>
  51#include <linux/if_addr.h>
  52#include <linux/if_arp.h>
  53#include <linux/if_arcnet.h>
  54#include <linux/if_infiniband.h>
  55#include <linux/route.h>
  56#include <linux/inetdevice.h>
  57#include <linux/init.h>
  58#include <linux/slab.h>
  59#ifdef CONFIG_SYSCTL
  60#include <linux/sysctl.h>
  61#endif
  62#include <linux/capability.h>
  63#include <linux/delay.h>
  64#include <linux/notifier.h>
  65#include <linux/string.h>
  66#include <linux/hash.h>
  67
  68#include <net/net_namespace.h>
  69#include <net/sock.h>
  70#include <net/snmp.h>
  71
  72#include <net/af_ieee802154.h>
  73#include <net/firewire.h>
  74#include <net/ipv6.h>
  75#include <net/protocol.h>
  76#include <net/ndisc.h>
  77#include <net/ip6_route.h>
  78#include <net/addrconf.h>
  79#include <net/tcp.h>
  80#include <net/ip.h>
  81#include <net/netlink.h>
  82#include <net/pkt_sched.h>
 
  83#include <linux/if_tunnel.h>
  84#include <linux/rtnetlink.h>
  85#include <linux/netconf.h>
  86#include <linux/random.h>
  87#include <linux/uaccess.h>
  88#include <asm/unaligned.h>
  89
  90#include <linux/proc_fs.h>
  91#include <linux/seq_file.h>
  92#include <linux/export.h>
  93
  94/* Set to 3 to get tracing... */
  95#define ACONF_DEBUG 2
  96
  97#if ACONF_DEBUG >= 3
  98#define ADBG(fmt, ...) printk(fmt, ##__VA_ARGS__)
  99#else
 100#define ADBG(fmt, ...) do { if (0) printk(fmt, ##__VA_ARGS__); } while (0)
 101#endif
 102
 103#define	INFINITY_LIFE_TIME	0xFFFFFFFF
 104
 
 
 
 105static inline u32 cstamp_delta(unsigned long cstamp)
 106{
 107	return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
 108}
 109
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 110#ifdef CONFIG_SYSCTL
 111static void addrconf_sysctl_register(struct inet6_dev *idev);
 112static void addrconf_sysctl_unregister(struct inet6_dev *idev);
 113#else
 114static inline void addrconf_sysctl_register(struct inet6_dev *idev)
 115{
 
 116}
 117
 118static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
 119{
 120}
 121#endif
 122
 123static void __ipv6_regen_rndid(struct inet6_dev *idev);
 124static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
 125static void ipv6_regen_rndid(unsigned long data);
 126
 127static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
 128static int ipv6_count_addresses(struct inet6_dev *idev);
 
 
 
 129
 
 
 130/*
 131 *	Configured unicast address hash table
 132 */
 133static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
 134static DEFINE_SPINLOCK(addrconf_hash_lock);
 135
 136static void addrconf_verify(void);
 137static void addrconf_verify_rtnl(void);
 138static void addrconf_verify_work(struct work_struct *);
 139
 140static struct workqueue_struct *addrconf_wq;
 141static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work);
 142
 143static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
 144static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
 145
 146static void addrconf_type_change(struct net_device *dev,
 147				 unsigned long event);
 148static int addrconf_ifdown(struct net_device *dev, int how);
 149
 150static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
 151						  int plen,
 152						  const struct net_device *dev,
 153						  u32 flags, u32 noflags);
 154
 155static void addrconf_dad_start(struct inet6_ifaddr *ifp);
 156static void addrconf_dad_work(struct work_struct *w);
 157static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
 
 158static void addrconf_dad_run(struct inet6_dev *idev);
 159static void addrconf_rs_timer(unsigned long data);
 160static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 161static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
 162
 163static void inet6_prefix_notify(int event, struct inet6_dev *idev,
 164				struct prefix_info *pinfo);
 165static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
 166			       struct net_device *dev);
 167
 168static struct ipv6_devconf ipv6_devconf __read_mostly = {
 169	.forwarding		= 0,
 170	.hop_limit		= IPV6_DEFAULT_HOPLIMIT,
 171	.mtu6			= IPV6_MIN_MTU,
 172	.accept_ra		= 1,
 173	.accept_redirects	= 1,
 174	.autoconf		= 1,
 175	.force_mld_version	= 0,
 176	.mldv1_unsolicited_report_interval = 10 * HZ,
 177	.mldv2_unsolicited_report_interval = HZ,
 178	.dad_transmits		= 1,
 179	.rtr_solicits		= MAX_RTR_SOLICITATIONS,
 180	.rtr_solicit_interval	= RTR_SOLICITATION_INTERVAL,
 
 181	.rtr_solicit_delay	= MAX_RTR_SOLICITATION_DELAY,
 182	.use_tempaddr 		= 0,
 183	.temp_valid_lft		= TEMP_VALID_LIFETIME,
 184	.temp_prefered_lft	= TEMP_PREFERRED_LIFETIME,
 185	.regen_max_retry	= REGEN_MAX_RETRY,
 186	.max_desync_factor	= MAX_DESYNC_FACTOR,
 187	.max_addresses		= IPV6_MAX_ADDRESSES,
 188	.accept_ra_defrtr	= 1,
 
 
 189	.accept_ra_pinfo	= 1,
 190#ifdef CONFIG_IPV6_ROUTER_PREF
 191	.accept_ra_rtr_pref	= 1,
 192	.rtr_probe_interval	= 60 * HZ,
 193#ifdef CONFIG_IPV6_ROUTE_INFO
 
 194	.accept_ra_rt_info_max_plen = 0,
 195#endif
 196#endif
 197	.proxy_ndp		= 0,
 198	.accept_source_route	= 0,	/* we do not accept RH0 by default. */
 199	.disable_ipv6		= 0,
 200	.accept_dad		= 1,
 201	.suppress_frag_ndisc	= 1,
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 202};
 203
 204static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
 205	.forwarding		= 0,
 206	.hop_limit		= IPV6_DEFAULT_HOPLIMIT,
 207	.mtu6			= IPV6_MIN_MTU,
 208	.accept_ra		= 1,
 209	.accept_redirects	= 1,
 210	.autoconf		= 1,
 211	.force_mld_version	= 0,
 212	.mldv1_unsolicited_report_interval = 10 * HZ,
 213	.mldv2_unsolicited_report_interval = HZ,
 214	.dad_transmits		= 1,
 215	.rtr_solicits		= MAX_RTR_SOLICITATIONS,
 216	.rtr_solicit_interval	= RTR_SOLICITATION_INTERVAL,
 
 217	.rtr_solicit_delay	= MAX_RTR_SOLICITATION_DELAY,
 218	.use_tempaddr		= 0,
 219	.temp_valid_lft		= TEMP_VALID_LIFETIME,
 220	.temp_prefered_lft	= TEMP_PREFERRED_LIFETIME,
 221	.regen_max_retry	= REGEN_MAX_RETRY,
 222	.max_desync_factor	= MAX_DESYNC_FACTOR,
 223	.max_addresses		= IPV6_MAX_ADDRESSES,
 224	.accept_ra_defrtr	= 1,
 
 
 225	.accept_ra_pinfo	= 1,
 226#ifdef CONFIG_IPV6_ROUTER_PREF
 227	.accept_ra_rtr_pref	= 1,
 228	.rtr_probe_interval	= 60 * HZ,
 229#ifdef CONFIG_IPV6_ROUTE_INFO
 
 230	.accept_ra_rt_info_max_plen = 0,
 231#endif
 232#endif
 233	.proxy_ndp		= 0,
 234	.accept_source_route	= 0,	/* we do not accept RH0 by default. */
 235	.disable_ipv6		= 0,
 236	.accept_dad		= 1,
 237	.suppress_frag_ndisc	= 1,
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 238};
 239
 240/* Check if a valid qdisc is available */
 241static inline bool addrconf_qdisc_ok(const struct net_device *dev)
 242{
 243	return !qdisc_tx_is_noop(dev);
 244}
 245
 246static void addrconf_del_rs_timer(struct inet6_dev *idev)
 247{
 248	if (del_timer(&idev->rs_timer))
 249		__in6_dev_put(idev);
 250}
 251
 252static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
 253{
 254	if (cancel_delayed_work(&ifp->dad_work))
 255		__in6_ifa_put(ifp);
 256}
 257
 258static void addrconf_mod_rs_timer(struct inet6_dev *idev,
 259				  unsigned long when)
 260{
 261	if (!timer_pending(&idev->rs_timer))
 262		in6_dev_hold(idev);
 263	mod_timer(&idev->rs_timer, jiffies + when);
 264}
 265
 266static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
 267				   unsigned long delay)
 268{
 269	if (!delayed_work_pending(&ifp->dad_work))
 270		in6_ifa_hold(ifp);
 271	mod_delayed_work(addrconf_wq, &ifp->dad_work, delay);
 272}
 273
 274static int snmp6_alloc_dev(struct inet6_dev *idev)
 275{
 276	int i;
 277
 278	if (snmp_mib_init((void __percpu **)idev->stats.ipv6,
 279			  sizeof(struct ipstats_mib),
 280			  __alignof__(struct ipstats_mib)) < 0)
 281		goto err_ip;
 282
 283	for_each_possible_cpu(i) {
 284		struct ipstats_mib *addrconf_stats;
 285		addrconf_stats = per_cpu_ptr(idev->stats.ipv6[0], i);
 286		u64_stats_init(&addrconf_stats->syncp);
 287#if SNMP_ARRAY_SZ == 2
 288		addrconf_stats = per_cpu_ptr(idev->stats.ipv6[1], i);
 289		u64_stats_init(&addrconf_stats->syncp);
 290#endif
 291	}
 292
 293
 294	idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
 295					GFP_KERNEL);
 296	if (!idev->stats.icmpv6dev)
 297		goto err_icmp;
 298	idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
 299					   GFP_KERNEL);
 300	if (!idev->stats.icmpv6msgdev)
 301		goto err_icmpmsg;
 302
 303	return 0;
 304
 305err_icmpmsg:
 306	kfree(idev->stats.icmpv6dev);
 307err_icmp:
 308	snmp_mib_free((void __percpu **)idev->stats.ipv6);
 309err_ip:
 310	return -ENOMEM;
 311}
 312
 313static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
 314{
 315	struct inet6_dev *ndev;
 
 316
 317	ASSERT_RTNL();
 318
 319	if (dev->mtu < IPV6_MIN_MTU)
 320		return NULL;
 321
 322	ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
 323
 324	if (ndev == NULL)
 325		return NULL;
 326
 327	rwlock_init(&ndev->lock);
 328	ndev->dev = dev;
 329	INIT_LIST_HEAD(&ndev->addr_list);
 330	setup_timer(&ndev->rs_timer, addrconf_rs_timer,
 331		    (unsigned long)ndev);
 332	memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
 
 
 
 
 
 
 333	ndev->cnf.mtu6 = dev->mtu;
 334	ndev->cnf.sysctl = NULL;
 335	ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
 336	if (ndev->nd_parms == NULL) {
 337		kfree(ndev);
 338		return NULL;
 339	}
 340	if (ndev->cnf.forwarding)
 341		dev_disable_lro(dev);
 342	/* We refer to the device */
 343	dev_hold(dev);
 344
 345	if (snmp6_alloc_dev(ndev) < 0) {
 346		ADBG(KERN_WARNING
 347			"%s: cannot allocate memory for statistics; dev=%s.\n",
 348			__func__, dev->name);
 349		neigh_parms_release(&nd_tbl, ndev->nd_parms);
 350		dev_put(dev);
 351		kfree(ndev);
 352		return NULL;
 353	}
 354
 355	if (snmp6_register_dev(ndev) < 0) {
 356		ADBG(KERN_WARNING
 357			"%s: cannot create /proc/net/dev_snmp6/%s\n",
 358			__func__, dev->name);
 359		neigh_parms_release(&nd_tbl, ndev->nd_parms);
 360		ndev->dead = 1;
 361		in6_dev_finish_destroy(ndev);
 362		return NULL;
 363	}
 364
 365	/* One reference from device.  We must do this before
 366	 * we invoke __ipv6_regen_rndid().
 367	 */
 368	in6_dev_hold(ndev);
 369
 370	if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
 371		ndev->cnf.accept_dad = -1;
 372
 373#if IS_ENABLED(CONFIG_IPV6_SIT)
 374	if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
 375		pr_info("%s: Disabled Multicast RS\n", dev->name);
 376		ndev->cnf.rtr_solicits = 0;
 377	}
 378#endif
 379
 380	INIT_LIST_HEAD(&ndev->tempaddr_list);
 381	setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
 382	if ((dev->flags&IFF_LOOPBACK) ||
 383	    dev->type == ARPHRD_TUNNEL ||
 384	    dev->type == ARPHRD_TUNNEL6 ||
 385	    dev->type == ARPHRD_SIT ||
 386	    dev->type == ARPHRD_NONE) {
 387		ndev->cnf.use_tempaddr = -1;
 388	} else {
 389		in6_dev_hold(ndev);
 390		ipv6_regen_rndid((unsigned long) ndev);
 391	}
 392
 393	ndev->token = in6addr_any;
 394
 395	if (netif_running(dev) && addrconf_qdisc_ok(dev))
 396		ndev->if_flags |= IF_READY;
 397
 398	ipv6_mc_init_dev(ndev);
 399	ndev->tstamp = jiffies;
 400	addrconf_sysctl_register(ndev);
 
 
 
 
 
 401	/* protected by rtnl_lock */
 402	rcu_assign_pointer(dev->ip6_ptr, ndev);
 403
 404	/* Join interface-local all-node multicast group */
 405	ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
 406
 407	/* Join all-node multicast group */
 408	ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
 409
 410	/* Join all-router multicast group if forwarding is set */
 411	if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
 412		ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
 413
 414	return ndev;
 
 
 
 
 
 
 415}
 416
 417static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
 418{
 419	struct inet6_dev *idev;
 420
 421	ASSERT_RTNL();
 422
 423	idev = __in6_dev_get(dev);
 424	if (!idev) {
 425		idev = ipv6_add_dev(dev);
 426		if (!idev)
 427			return NULL;
 428	}
 429
 430	if (dev->flags&IFF_UP)
 431		ipv6_mc_up(idev);
 432	return idev;
 433}
 434
 435static int inet6_netconf_msgsize_devconf(int type)
 436{
 437	int size =  NLMSG_ALIGN(sizeof(struct netconfmsg))
 438		    + nla_total_size(4);	/* NETCONFA_IFINDEX */
 
 439
 440	/* type -1 is used for ALL */
 441	if (type == -1 || type == NETCONFA_FORWARDING)
 
 
 442		size += nla_total_size(4);
 443#ifdef CONFIG_IPV6_MROUTE
 444	if (type == -1 || type == NETCONFA_MC_FORWARDING)
 445		size += nla_total_size(4);
 446#endif
 447	if (type == -1 || type == NETCONFA_PROXY_NEIGH)
 
 
 
 448		size += nla_total_size(4);
 449
 450	return size;
 451}
 452
 453static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
 454				      struct ipv6_devconf *devconf, u32 portid,
 455				      u32 seq, int event, unsigned int flags,
 456				      int type)
 457{
 458	struct nlmsghdr  *nlh;
 459	struct netconfmsg *ncm;
 
 460
 461	nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
 462			flags);
 463	if (nlh == NULL)
 464		return -EMSGSIZE;
 465
 
 
 
 466	ncm = nlmsg_data(nlh);
 467	ncm->ncm_family = AF_INET6;
 468
 469	if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
 470		goto nla_put_failure;
 471
 472	/* type -1 is used for ALL */
 473	if ((type == -1 || type == NETCONFA_FORWARDING) &&
 
 
 474	    nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
 475		goto nla_put_failure;
 476#ifdef CONFIG_IPV6_MROUTE
 477	if ((type == -1 || type == NETCONFA_MC_FORWARDING) &&
 478	    nla_put_s32(skb, NETCONFA_MC_FORWARDING,
 479			devconf->mc_forwarding) < 0)
 480		goto nla_put_failure;
 481#endif
 482	if ((type == -1 || type == NETCONFA_PROXY_NEIGH) &&
 483	    nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
 484		goto nla_put_failure;
 485
 486	return nlmsg_end(skb, nlh);
 
 
 
 
 
 
 
 487
 488nla_put_failure:
 489	nlmsg_cancel(skb, nlh);
 490	return -EMSGSIZE;
 491}
 492
 493void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
 494				  struct ipv6_devconf *devconf)
 495{
 496	struct sk_buff *skb;
 497	int err = -ENOBUFS;
 498
 499	skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC);
 500	if (skb == NULL)
 501		goto errout;
 502
 503	err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
 504					 RTM_NEWNETCONF, 0, type);
 505	if (err < 0) {
 506		/* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
 507		WARN_ON(err == -EMSGSIZE);
 508		kfree_skb(skb);
 509		goto errout;
 510	}
 511	rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC);
 512	return;
 513errout:
 514	rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
 515}
 516
 517static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
 518	[NETCONFA_IFINDEX]	= { .len = sizeof(int) },
 519	[NETCONFA_FORWARDING]	= { .len = sizeof(int) },
 520	[NETCONFA_PROXY_NEIGH]	= { .len = sizeof(int) },
 
 521};
 522
 523static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
 524				     struct nlmsghdr *nlh)
 
 525{
 526	struct net *net = sock_net(in_skb->sk);
 527	struct nlattr *tb[NETCONFA_MAX+1];
 
 
 528	struct netconfmsg *ncm;
 529	struct sk_buff *skb;
 530	struct ipv6_devconf *devconf;
 531	struct inet6_dev *in6_dev;
 532	struct net_device *dev;
 533	int ifindex;
 534	int err;
 535
 536	err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
 537			  devconf_ipv6_policy);
 538	if (err < 0)
 539		goto errout;
 540
 541	err = EINVAL;
 542	if (!tb[NETCONFA_IFINDEX])
 543		goto errout;
 544
 
 545	ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
 546	switch (ifindex) {
 547	case NETCONFA_IFINDEX_ALL:
 548		devconf = net->ipv6.devconf_all;
 549		break;
 550	case NETCONFA_IFINDEX_DEFAULT:
 551		devconf = net->ipv6.devconf_dflt;
 552		break;
 553	default:
 554		dev = __dev_get_by_index(net, ifindex);
 555		if (dev == NULL)
 556			goto errout;
 557		in6_dev = __in6_dev_get(dev);
 558		if (in6_dev == NULL)
 559			goto errout;
 560		devconf = &in6_dev->cnf;
 561		break;
 562	}
 563
 564	err = -ENOBUFS;
 565	skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC);
 566	if (skb == NULL)
 567		goto errout;
 568
 569	err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
 570					 NETLINK_CB(in_skb).portid,
 571					 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
 572					 -1);
 573	if (err < 0) {
 574		/* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
 575		WARN_ON(err == -EMSGSIZE);
 576		kfree_skb(skb);
 577		goto errout;
 578	}
 579	err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
 580errout:
 
 
 
 
 581	return err;
 582}
 583
 584static int inet6_netconf_dump_devconf(struct sk_buff *skb,
 585				      struct netlink_callback *cb)
 586{
 587	struct net *net = sock_net(skb->sk);
 588	int h, s_h;
 589	int idx, s_idx;
 590	struct net_device *dev;
 591	struct inet6_dev *idev;
 592	struct hlist_head *head;
 593
 594	s_h = cb->args[0];
 595	s_idx = idx = cb->args[1];
 596
 597	for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
 598		idx = 0;
 599		head = &net->dev_index_head[h];
 600		rcu_read_lock();
 601		cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
 602			  net->dev_base_seq;
 603		hlist_for_each_entry_rcu(dev, head, index_hlist) {
 604			if (idx < s_idx)
 605				goto cont;
 606			idev = __in6_dev_get(dev);
 607			if (!idev)
 608				goto cont;
 609
 610			if (inet6_netconf_fill_devconf(skb, dev->ifindex,
 611						       &idev->cnf,
 612						       NETLINK_CB(cb->skb).portid,
 613						       cb->nlh->nlmsg_seq,
 614						       RTM_NEWNETCONF,
 615						       NLM_F_MULTI,
 616						       -1) <= 0) {
 617				rcu_read_unlock();
 618				goto done;
 619			}
 620			nl_dump_check_consistent(cb, nlmsg_hdr(skb));
 621cont:
 622			idx++;
 623		}
 624		rcu_read_unlock();
 625	}
 626	if (h == NETDEV_HASHENTRIES) {
 627		if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
 628					       net->ipv6.devconf_all,
 629					       NETLINK_CB(cb->skb).portid,
 630					       cb->nlh->nlmsg_seq,
 631					       RTM_NEWNETCONF, NLM_F_MULTI,
 632					       -1) <= 0)
 633			goto done;
 634		else
 635			h++;
 636	}
 637	if (h == NETDEV_HASHENTRIES + 1) {
 638		if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
 639					       net->ipv6.devconf_dflt,
 640					       NETLINK_CB(cb->skb).portid,
 641					       cb->nlh->nlmsg_seq,
 642					       RTM_NEWNETCONF, NLM_F_MULTI,
 643					       -1) <= 0)
 644			goto done;
 645		else
 646			h++;
 647	}
 648done:
 649	cb->args[0] = h;
 650	cb->args[1] = idx;
 651
 652	return skb->len;
 653}
 654
 655#ifdef CONFIG_SYSCTL
 656static void dev_forward_change(struct inet6_dev *idev)
 657{
 658	struct net_device *dev;
 659	struct inet6_ifaddr *ifa;
 660
 661	if (!idev)
 662		return;
 663	dev = idev->dev;
 664	if (idev->cnf.forwarding)
 665		dev_disable_lro(dev);
 666	if (dev->flags & IFF_MULTICAST) {
 667		if (idev->cnf.forwarding) {
 668			ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
 669			ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
 670			ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
 671		} else {
 672			ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
 673			ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
 674			ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
 675		}
 676	}
 677
 678	list_for_each_entry(ifa, &idev->addr_list, if_list) {
 679		if (ifa->flags&IFA_F_TENTATIVE)
 680			continue;
 681		if (idev->cnf.forwarding)
 682			addrconf_join_anycast(ifa);
 683		else
 684			addrconf_leave_anycast(ifa);
 685	}
 686	inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
 
 687				     dev->ifindex, &idev->cnf);
 688}
 689
 690
 691static void addrconf_forward_change(struct net *net, __s32 newf)
 692{
 693	struct net_device *dev;
 694	struct inet6_dev *idev;
 695
 696	for_each_netdev(net, dev) {
 697		idev = __in6_dev_get(dev);
 698		if (idev) {
 699			int changed = (!idev->cnf.forwarding) ^ (!newf);
 700			idev->cnf.forwarding = newf;
 701			if (changed)
 702				dev_forward_change(idev);
 703		}
 704	}
 705}
 706
 707static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
 708{
 709	struct net *net;
 710	int old;
 711
 712	if (!rtnl_trylock())
 713		return restart_syscall();
 714
 715	net = (struct net *)table->extra2;
 716	old = *p;
 717	*p = newf;
 718
 719	if (p == &net->ipv6.devconf_dflt->forwarding) {
 720		if ((!newf) ^ (!old))
 721			inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
 
 722						     NETCONFA_IFINDEX_DEFAULT,
 723						     net->ipv6.devconf_dflt);
 724		rtnl_unlock();
 725		return 0;
 726	}
 727
 728	if (p == &net->ipv6.devconf_all->forwarding) {
 
 
 729		net->ipv6.devconf_dflt->forwarding = newf;
 
 
 
 
 
 
 730		addrconf_forward_change(net, newf);
 731		if ((!newf) ^ (!old))
 732			inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
 
 733						     NETCONFA_IFINDEX_ALL,
 734						     net->ipv6.devconf_all);
 735	} else if ((!newf) ^ (!old))
 736		dev_forward_change((struct inet6_dev *)table->extra1);
 737	rtnl_unlock();
 738
 739	if (newf)
 740		rt6_purge_dflt_routers(net);
 741	return 1;
 742}
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 743#endif
 744
 745/* Nobody refers to this ifaddr, destroy it */
 746void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
 747{
 748	WARN_ON(!hlist_unhashed(&ifp->addr_lst));
 749
 750#ifdef NET_REFCNT_DEBUG
 751	pr_debug("%s\n", __func__);
 752#endif
 753
 754	in6_dev_put(ifp->idev);
 755
 756	if (cancel_delayed_work(&ifp->dad_work))
 757		pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
 758			  ifp);
 759
 760	if (ifp->state != INET6_IFADDR_STATE_DEAD) {
 761		pr_warn("Freeing alive inet6 address %p\n", ifp);
 762		return;
 763	}
 764	ip6_rt_put(ifp->rt);
 765
 766	kfree_rcu(ifp, rcu);
 767}
 768
 769static void
 770ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
 771{
 772	struct list_head *p;
 773	int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
 774
 775	/*
 776	 * Each device address list is sorted in order of scope -
 777	 * global before linklocal.
 778	 */
 779	list_for_each(p, &idev->addr_list) {
 780		struct inet6_ifaddr *ifa
 781			= list_entry(p, struct inet6_ifaddr, if_list);
 782		if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
 783			break;
 784	}
 785
 786	list_add_tail(&ifp->if_list, p);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 787}
 788
 789static u32 inet6_addr_hash(const struct in6_addr *addr)
 790{
 791	return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 792}
 793
 794/* On success it returns ifp with increased reference count */
 795
 796static struct inet6_ifaddr *
 797ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
 798	      const struct in6_addr *peer_addr, int pfxlen,
 799	      int scope, u32 flags, u32 valid_lft, u32 prefered_lft)
 
 800{
 
 
 801	struct inet6_ifaddr *ifa = NULL;
 802	struct rt6_info *rt;
 803	unsigned int hash;
 804	int err = 0;
 805	int addr_type = ipv6_addr_type(addr);
 806
 807	if (addr_type == IPV6_ADDR_ANY ||
 808	    addr_type & IPV6_ADDR_MULTICAST ||
 809	    (!(idev->dev->flags & IFF_LOOPBACK) &&
 810	     addr_type & IPV6_ADDR_LOOPBACK))
 811		return ERR_PTR(-EADDRNOTAVAIL);
 812
 813	rcu_read_lock_bh();
 814	if (idev->dead) {
 815		err = -ENODEV;			/*XXX*/
 816		goto out2;
 817	}
 818
 819	if (idev->cnf.disable_ipv6) {
 820		err = -EACCES;
 821		goto out2;
 822	}
 823
 824	spin_lock(&addrconf_hash_lock);
 825
 826	/* Ignore adding duplicate addresses on an interface */
 827	if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
 828		ADBG("ipv6_add_addr: already assigned\n");
 829		err = -EEXIST;
 830		goto out;
 831	}
 832
 833	ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 834
 835	if (ifa == NULL) {
 836		ADBG("ipv6_add_addr: malloc failed\n");
 837		err = -ENOBUFS;
 838		goto out;
 839	}
 840
 841	rt = addrconf_dst_alloc(idev, addr, false);
 842	if (IS_ERR(rt)) {
 843		err = PTR_ERR(rt);
 
 844		goto out;
 845	}
 846
 
 
 
 
 847	neigh_parms_data_state_setall(idev->nd_parms);
 848
 849	ifa->addr = *addr;
 850	if (peer_addr)
 851		ifa->peer_addr = *peer_addr;
 852
 853	spin_lock_init(&ifa->lock);
 854	spin_lock_init(&ifa->state_lock);
 855	INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
 856	INIT_HLIST_NODE(&ifa->addr_lst);
 857	ifa->scope = scope;
 858	ifa->prefix_len = pfxlen;
 859	ifa->flags = flags | IFA_F_TENTATIVE;
 
 
 
 860	ifa->valid_lft = valid_lft;
 861	ifa->prefered_lft = prefered_lft;
 862	ifa->cstamp = ifa->tstamp = jiffies;
 863	ifa->tokenized = false;
 864
 865	ifa->rt = rt;
 866
 867	ifa->idev = idev;
 868	in6_dev_hold(idev);
 
 869	/* For caller */
 870	in6_ifa_hold(ifa);
 871
 872	/* Add to big hash table */
 873	hash = inet6_addr_hash(addr);
 874
 875	hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
 876	spin_unlock(&addrconf_hash_lock);
 
 
 
 877
 878	write_lock(&idev->lock);
 
 879	/* Add to inet6_dev unicast addr list. */
 880	ipv6_link_dev_addr(idev, ifa);
 881
 882	if (ifa->flags&IFA_F_TEMPORARY) {
 883		list_add(&ifa->tmp_list, &idev->tempaddr_list);
 884		in6_ifa_hold(ifa);
 885	}
 886
 887	in6_ifa_hold(ifa);
 888	write_unlock(&idev->lock);
 889out2:
 890	rcu_read_unlock_bh();
 891
 892	if (likely(err == 0))
 893		inet6addr_notifier_call_chain(NETDEV_UP, ifa);
 894	else {
 895		kfree(ifa);
 
 
 
 
 
 
 896		ifa = ERR_PTR(err);
 897	}
 898
 899	return ifa;
 900out:
 901	spin_unlock(&addrconf_hash_lock);
 902	goto out2;
 903}
 904
 905enum cleanup_prefix_rt_t {
 906	CLEANUP_PREFIX_RT_NOP,    /* no cleanup action for prefix route */
 907	CLEANUP_PREFIX_RT_DEL,    /* delete the prefix route */
 908	CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
 909};
 910
 911/*
 912 * Check, whether the prefix for ifp would still need a prefix route
 913 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
 914 * constants.
 915 *
 916 * 1) we don't purge prefix if address was not permanent.
 917 *    prefix is managed by its own lifetime.
 918 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
 919 * 3) if there are no addresses, delete prefix.
 920 * 4) if there are still other permanent address(es),
 921 *    corresponding prefix is still permanent.
 922 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
 923 *    don't purge the prefix, assume user space is managing it.
 924 * 6) otherwise, update prefix lifetime to the
 925 *    longest valid lifetime among the corresponding
 926 *    addresses on the device.
 927 *    Note: subsequent RA will update lifetime.
 928 **/
 929static enum cleanup_prefix_rt_t
 930check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
 931{
 932	struct inet6_ifaddr *ifa;
 933	struct inet6_dev *idev = ifp->idev;
 934	unsigned long lifetime;
 935	enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
 936
 937	*expires = jiffies;
 938
 939	list_for_each_entry(ifa, &idev->addr_list, if_list) {
 940		if (ifa == ifp)
 941			continue;
 942		if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr,
 943				       ifp->prefix_len))
 944			continue;
 945		if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
 946			return CLEANUP_PREFIX_RT_NOP;
 947
 948		action = CLEANUP_PREFIX_RT_EXPIRE;
 949
 950		spin_lock(&ifa->lock);
 951
 952		lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
 953		/*
 954		 * Note: Because this address is
 955		 * not permanent, lifetime <
 956		 * LONG_MAX / HZ here.
 957		 */
 958		if (time_before(*expires, ifa->tstamp + lifetime * HZ))
 959			*expires = ifa->tstamp + lifetime * HZ;
 960		spin_unlock(&ifa->lock);
 961	}
 962
 963	return action;
 964}
 965
 966static void
 967cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
 968{
 969	struct rt6_info *rt;
 970
 971	rt = addrconf_get_prefix_route(&ifp->addr,
 972				       ifp->prefix_len,
 973				       ifp->idev->dev,
 974				       0, RTF_GATEWAY | RTF_DEFAULT);
 975	if (rt) {
 976		if (del_rt)
 977			ip6_del_rt(rt);
 978		else {
 979			if (!(rt->rt6i_flags & RTF_EXPIRES))
 980				rt6_set_expires(rt, expires);
 981			ip6_rt_put(rt);
 982		}
 983	}
 984}
 985
 986
 987/* This function wants to get referenced ifp and releases it before return */
 988
 989static void ipv6_del_addr(struct inet6_ifaddr *ifp)
 990{
 991	int state;
 992	enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
 993	unsigned long expires;
 994
 995	ASSERT_RTNL();
 996
 997	spin_lock_bh(&ifp->state_lock);
 998	state = ifp->state;
 999	ifp->state = INET6_IFADDR_STATE_DEAD;
1000	spin_unlock_bh(&ifp->state_lock);
1001
1002	if (state == INET6_IFADDR_STATE_DEAD)
1003		goto out;
1004
1005	spin_lock_bh(&addrconf_hash_lock);
1006	hlist_del_init_rcu(&ifp->addr_lst);
1007	spin_unlock_bh(&addrconf_hash_lock);
1008
1009	write_lock_bh(&ifp->idev->lock);
1010
1011	if (ifp->flags&IFA_F_TEMPORARY) {
1012		list_del(&ifp->tmp_list);
1013		if (ifp->ifpub) {
1014			in6_ifa_put(ifp->ifpub);
1015			ifp->ifpub = NULL;
1016		}
1017		__in6_ifa_put(ifp);
1018	}
1019
1020	if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1021		action = check_cleanup_prefix_route(ifp, &expires);
1022
1023	list_del_init(&ifp->if_list);
1024	__in6_ifa_put(ifp);
1025
1026	write_unlock_bh(&ifp->idev->lock);
1027
1028	addrconf_del_dad_work(ifp);
1029
1030	ipv6_ifa_notify(RTM_DELADDR, ifp);
1031
1032	inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1033
1034	if (action != CLEANUP_PREFIX_RT_NOP) {
1035		cleanup_prefix_route(ifp, expires,
1036			action == CLEANUP_PREFIX_RT_DEL);
1037	}
1038
1039	/* clean up prefsrc entries */
1040	rt6_remove_prefsrc(ifp);
1041out:
1042	in6_ifa_put(ifp);
1043}
1044
1045static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
 
 
1046{
1047	struct inet6_dev *idev = ifp->idev;
1048	struct in6_addr addr, *tmpaddr;
1049	unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
1050	unsigned long regen_advance;
1051	int tmp_plen;
1052	int ret = 0;
1053	u32 addr_flags;
1054	unsigned long now = jiffies;
 
 
1055
1056	write_lock_bh(&idev->lock);
1057	if (ift) {
1058		spin_lock_bh(&ift->lock);
1059		memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1060		spin_unlock_bh(&ift->lock);
1061		tmpaddr = &addr;
1062	} else {
1063		tmpaddr = NULL;
1064	}
1065retry:
1066	in6_dev_hold(idev);
1067	if (idev->cnf.use_tempaddr <= 0) {
1068		write_unlock_bh(&idev->lock);
1069		pr_info("%s: use_tempaddr is disabled\n", __func__);
1070		in6_dev_put(idev);
1071		ret = -1;
1072		goto out;
1073	}
1074	spin_lock_bh(&ifp->lock);
1075	if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1076		idev->cnf.use_tempaddr = -1;	/*XXX*/
1077		spin_unlock_bh(&ifp->lock);
1078		write_unlock_bh(&idev->lock);
1079		pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1080			__func__);
1081		in6_dev_put(idev);
1082		ret = -1;
1083		goto out;
1084	}
1085	in6_ifa_hold(ifp);
1086	memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1087	__ipv6_try_regen_rndid(idev, tmpaddr);
1088	memcpy(&addr.s6_addr[8], idev->rndid, 8);
1089	age = (now - ifp->tstamp) / HZ;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1090	tmp_valid_lft = min_t(__u32,
1091			      ifp->valid_lft,
1092			      idev->cnf.temp_valid_lft + age);
1093	tmp_prefered_lft = min_t(__u32,
1094				 ifp->prefered_lft,
1095				 idev->cnf.temp_prefered_lft + age -
1096				 idev->cnf.max_desync_factor);
1097	tmp_plen = ifp->prefix_len;
1098	tmp_tstamp = ifp->tstamp;
1099	spin_unlock_bh(&ifp->lock);
1100
1101	regen_advance = idev->cnf.regen_max_retry *
1102	                idev->cnf.dad_transmits *
1103	                NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
1104	write_unlock_bh(&idev->lock);
1105
1106	/* A temporary address is created only if this calculated Preferred
1107	 * Lifetime is greater than REGEN_ADVANCE time units.  In particular,
1108	 * an implementation must not create a temporary address with a zero
1109	 * Preferred Lifetime.
1110	 * Use age calculation as in addrconf_verify to avoid unnecessary
1111	 * temporary addresses being generated.
1112	 */
1113	age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1114	if (tmp_prefered_lft <= regen_advance + age) {
1115		in6_ifa_put(ifp);
1116		in6_dev_put(idev);
1117		ret = -1;
1118		goto out;
1119	}
1120
1121	addr_flags = IFA_F_TEMPORARY;
1122	/* set in addrconf_prefix_rcv() */
1123	if (ifp->flags & IFA_F_OPTIMISTIC)
1124		addr_flags |= IFA_F_OPTIMISTIC;
1125
1126	ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1127			    ipv6_addr_scope(&addr), addr_flags,
1128			    tmp_valid_lft, tmp_prefered_lft);
1129	if (IS_ERR(ift)) {
1130		in6_ifa_put(ifp);
1131		in6_dev_put(idev);
1132		pr_info("%s: retry temporary address regeneration\n", __func__);
1133		tmpaddr = &addr;
1134		write_lock_bh(&idev->lock);
1135		goto retry;
1136	}
1137
1138	spin_lock_bh(&ift->lock);
1139	ift->ifpub = ifp;
1140	ift->cstamp = now;
1141	ift->tstamp = tmp_tstamp;
1142	spin_unlock_bh(&ift->lock);
1143
1144	addrconf_dad_start(ift);
1145	in6_ifa_put(ift);
1146	in6_dev_put(idev);
1147out:
1148	return ret;
1149}
1150
1151/*
1152 *	Choose an appropriate source address (RFC3484)
1153 */
1154enum {
1155	IPV6_SADDR_RULE_INIT = 0,
1156	IPV6_SADDR_RULE_LOCAL,
1157	IPV6_SADDR_RULE_SCOPE,
1158	IPV6_SADDR_RULE_PREFERRED,
1159#ifdef CONFIG_IPV6_MIP6
1160	IPV6_SADDR_RULE_HOA,
1161#endif
1162	IPV6_SADDR_RULE_OIF,
1163	IPV6_SADDR_RULE_LABEL,
1164	IPV6_SADDR_RULE_PRIVACY,
1165	IPV6_SADDR_RULE_ORCHID,
1166	IPV6_SADDR_RULE_PREFIX,
 
 
 
1167	IPV6_SADDR_RULE_MAX
1168};
1169
1170struct ipv6_saddr_score {
1171	int			rule;
1172	int			addr_type;
1173	struct inet6_ifaddr	*ifa;
1174	DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1175	int			scopedist;
1176	int			matchlen;
1177};
1178
1179struct ipv6_saddr_dst {
1180	const struct in6_addr *addr;
1181	int ifindex;
1182	int scope;
1183	int label;
1184	unsigned int prefs;
1185};
1186
1187static inline int ipv6_saddr_preferred(int type)
1188{
1189	if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1190		return 1;
1191	return 0;
1192}
1193
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1194static int ipv6_get_saddr_eval(struct net *net,
1195			       struct ipv6_saddr_score *score,
1196			       struct ipv6_saddr_dst *dst,
1197			       int i)
1198{
1199	int ret;
1200
1201	if (i <= score->rule) {
1202		switch (i) {
1203		case IPV6_SADDR_RULE_SCOPE:
1204			ret = score->scopedist;
1205			break;
1206		case IPV6_SADDR_RULE_PREFIX:
1207			ret = score->matchlen;
1208			break;
1209		default:
1210			ret = !!test_bit(i, score->scorebits);
1211		}
1212		goto out;
1213	}
1214
1215	switch (i) {
1216	case IPV6_SADDR_RULE_INIT:
1217		/* Rule 0: remember if hiscore is not ready yet */
1218		ret = !!score->ifa;
1219		break;
1220	case IPV6_SADDR_RULE_LOCAL:
1221		/* Rule 1: Prefer same address */
1222		ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1223		break;
1224	case IPV6_SADDR_RULE_SCOPE:
1225		/* Rule 2: Prefer appropriate scope
1226		 *
1227		 *      ret
1228		 *       ^
1229		 *    -1 |  d 15
1230		 *    ---+--+-+---> scope
1231		 *       |
1232		 *       |             d is scope of the destination.
1233		 *  B-d  |  \
1234		 *       |   \      <- smaller scope is better if
1235		 *  B-15 |    \        if scope is enough for destination.
1236		 *       |             ret = B - scope (-1 <= scope >= d <= 15).
1237		 * d-C-1 | /
1238		 *       |/         <- greater is better
1239		 *   -C  /             if scope is not enough for destination.
1240		 *      /|             ret = scope - C (-1 <= d < scope <= 15).
1241		 *
1242		 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1243		 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1244		 * Assume B = 0 and we get C > 29.
1245		 */
1246		ret = __ipv6_addr_src_scope(score->addr_type);
1247		if (ret >= dst->scope)
1248			ret = -ret;
1249		else
1250			ret -= 128;	/* 30 is enough */
1251		score->scopedist = ret;
1252		break;
1253	case IPV6_SADDR_RULE_PREFERRED:
 
1254		/* Rule 3: Avoid deprecated and optimistic addresses */
 
 
 
 
1255		ret = ipv6_saddr_preferred(score->addr_type) ||
1256		      !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1257		break;
 
1258#ifdef CONFIG_IPV6_MIP6
1259	case IPV6_SADDR_RULE_HOA:
1260	    {
1261		/* Rule 4: Prefer home address */
1262		int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1263		ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1264		break;
1265	    }
1266#endif
1267	case IPV6_SADDR_RULE_OIF:
1268		/* Rule 5: Prefer outgoing interface */
1269		ret = (!dst->ifindex ||
1270		       dst->ifindex == score->ifa->idev->dev->ifindex);
1271		break;
1272	case IPV6_SADDR_RULE_LABEL:
1273		/* Rule 6: Prefer matching label */
1274		ret = ipv6_addr_label(net,
1275				      &score->ifa->addr, score->addr_type,
1276				      score->ifa->idev->dev->ifindex) == dst->label;
1277		break;
1278	case IPV6_SADDR_RULE_PRIVACY:
1279	    {
1280		/* Rule 7: Prefer public address
1281		 * Note: prefer temporary address if use_tempaddr >= 2
1282		 */
1283		int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1284				!!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1285				score->ifa->idev->cnf.use_tempaddr >= 2;
1286		ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1287		break;
1288	    }
1289	case IPV6_SADDR_RULE_ORCHID:
1290		/* Rule 8-: Prefer ORCHID vs ORCHID or
1291		 *	    non-ORCHID vs non-ORCHID
1292		 */
1293		ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1294			ipv6_addr_orchid(dst->addr));
1295		break;
1296	case IPV6_SADDR_RULE_PREFIX:
1297		/* Rule 8: Use longest matching prefix */
1298		ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1299		if (ret > score->ifa->prefix_len)
1300			ret = score->ifa->prefix_len;
1301		score->matchlen = ret;
1302		break;
 
 
 
 
 
 
 
 
1303	default:
1304		ret = 0;
1305	}
1306
1307	if (ret)
1308		__set_bit(i, score->scorebits);
1309	score->rule = i;
1310out:
1311	return ret;
1312}
1313
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1314int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1315		       const struct in6_addr *daddr, unsigned int prefs,
1316		       struct in6_addr *saddr)
1317{
1318	struct ipv6_saddr_score scores[2],
1319				*score = &scores[0], *hiscore = &scores[1];
1320	struct ipv6_saddr_dst dst;
 
1321	struct net_device *dev;
1322	int dst_type;
 
 
 
1323
1324	dst_type = __ipv6_addr_type(daddr);
1325	dst.addr = daddr;
1326	dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1327	dst.scope = __ipv6_addr_src_scope(dst_type);
1328	dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1329	dst.prefs = prefs;
1330
1331	hiscore->rule = -1;
1332	hiscore->ifa = NULL;
1333
1334	rcu_read_lock();
1335
1336	for_each_netdev_rcu(net, dev) {
1337		struct inet6_dev *idev;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1338
1339		/* Candidate Source Address (section 4)
1340		 *  - multicast and link-local destination address,
1341		 *    the set of candidate source address MUST only
1342		 *    include addresses assigned to interfaces
1343		 *    belonging to the same link as the outgoing
1344		 *    interface.
1345		 * (- For site-local destination addresses, the
1346		 *    set of candidate source addresses MUST only
1347		 *    include addresses assigned to interfaces
1348		 *    belonging to the same site as the outgoing
1349		 *    interface.)
1350		 */
1351		if (((dst_type & IPV6_ADDR_MULTICAST) ||
1352		     dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1353		    dst.ifindex && dev->ifindex != dst.ifindex)
1354			continue;
1355
1356		idev = __in6_dev_get(dev);
1357		if (!idev)
1358			continue;
 
 
 
 
 
 
 
 
1359
1360		read_lock_bh(&idev->lock);
1361		list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1362			int i;
1363
1364			/*
1365			 * - Tentative Address (RFC2462 section 5.4)
1366			 *  - A tentative address is not considered
1367			 *    "assigned to an interface" in the traditional
1368			 *    sense, unless it is also flagged as optimistic.
1369			 * - Candidate Source Address (section 4)
1370			 *  - In any case, anycast addresses, multicast
1371			 *    addresses, and the unspecified address MUST
1372			 *    NOT be included in a candidate set.
1373			 */
1374			if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1375			    (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1376				continue;
1377
1378			score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1379
1380			if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1381				     score->addr_type & IPV6_ADDR_MULTICAST)) {
1382				LIMIT_NETDEBUG(KERN_DEBUG
1383					       "ADDRCONF: unspecified / multicast address "
1384					       "assigned as unicast address on %s",
1385					       dev->name);
1386				continue;
1387			}
1388
1389			score->rule = -1;
1390			bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1391
1392			for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1393				int minihiscore, miniscore;
1394
1395				minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1396				miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1397
1398				if (minihiscore > miniscore) {
1399					if (i == IPV6_SADDR_RULE_SCOPE &&
1400					    score->scopedist > 0) {
1401						/*
1402						 * special case:
1403						 * each remaining entry
1404						 * has too small (not enough)
1405						 * scope, because ifa entries
1406						 * are sorted by their scope
1407						 * values.
1408						 */
1409						goto try_nextdev;
1410					}
1411					break;
1412				} else if (minihiscore < miniscore) {
1413					if (hiscore->ifa)
1414						in6_ifa_put(hiscore->ifa);
1415
1416					in6_ifa_hold(score->ifa);
1417
1418					swap(hiscore, score);
1419
1420					/* restore our iterator */
1421					score->ifa = hiscore->ifa;
1422
1423					break;
1424				}
1425			}
1426		}
1427try_nextdev:
1428		read_unlock_bh(&idev->lock);
1429	}
1430	rcu_read_unlock();
1431
 
 
1432	if (!hiscore->ifa)
1433		return -EADDRNOTAVAIL;
 
 
1434
1435	*saddr = hiscore->ifa->addr;
1436	in6_ifa_put(hiscore->ifa);
1437	return 0;
1438}
1439EXPORT_SYMBOL(ipv6_dev_get_saddr);
1440
1441int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1442		      u32 banned_flags)
1443{
1444	struct inet6_ifaddr *ifp;
1445	int err = -EADDRNOTAVAIL;
1446
1447	list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1448		if (ifp->scope > IFA_LINK)
1449			break;
1450		if (ifp->scope == IFA_LINK &&
1451		    !(ifp->flags & banned_flags)) {
1452			*addr = ifp->addr;
1453			err = 0;
1454			break;
1455		}
1456	}
1457	return err;
1458}
1459
1460int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1461		    u32 banned_flags)
1462{
1463	struct inet6_dev *idev;
1464	int err = -EADDRNOTAVAIL;
1465
1466	rcu_read_lock();
1467	idev = __in6_dev_get(dev);
1468	if (idev) {
1469		read_lock_bh(&idev->lock);
1470		err = __ipv6_get_lladdr(idev, addr, banned_flags);
1471		read_unlock_bh(&idev->lock);
1472	}
1473	rcu_read_unlock();
1474	return err;
1475}
1476
1477static int ipv6_count_addresses(struct inet6_dev *idev)
1478{
 
1479	int cnt = 0;
1480	struct inet6_ifaddr *ifp;
1481
1482	read_lock_bh(&idev->lock);
1483	list_for_each_entry(ifp, &idev->addr_list, if_list)
1484		cnt++;
1485	read_unlock_bh(&idev->lock);
1486	return cnt;
1487}
1488
1489int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1490		  const struct net_device *dev, int strict)
1491{
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1492	struct inet6_ifaddr *ifp;
1493	unsigned int hash = inet6_addr_hash(addr);
 
 
 
 
 
 
1494
1495	rcu_read_lock_bh();
1496	hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1497		if (!net_eq(dev_net(ifp->idev->dev), net))
1498			continue;
 
 
 
 
 
 
 
 
 
 
1499		if (ipv6_addr_equal(&ifp->addr, addr) &&
1500		    !(ifp->flags&IFA_F_TENTATIVE) &&
1501		    (dev == NULL || ifp->idev->dev == dev ||
1502		     !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1503			rcu_read_unlock_bh();
1504			return 1;
1505		}
1506	}
1507
1508	rcu_read_unlock_bh();
1509	return 0;
1510}
1511EXPORT_SYMBOL(ipv6_chk_addr);
1512
1513static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1514			       struct net_device *dev)
1515{
1516	unsigned int hash = inet6_addr_hash(addr);
1517	struct inet6_ifaddr *ifp;
1518
1519	hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
1520		if (!net_eq(dev_net(ifp->idev->dev), net))
1521			continue;
1522		if (ipv6_addr_equal(&ifp->addr, addr)) {
1523			if (dev == NULL || ifp->idev->dev == dev)
1524				return true;
1525		}
1526	}
1527	return false;
1528}
1529
1530/* Compares an address/prefix_len with addresses on device @dev.
1531 * If one is found it returns true.
1532 */
1533bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1534	const unsigned int prefix_len, struct net_device *dev)
1535{
1536	struct inet6_dev *idev;
1537	struct inet6_ifaddr *ifa;
1538	bool ret = false;
1539
1540	rcu_read_lock();
1541	idev = __in6_dev_get(dev);
1542	if (idev) {
1543		read_lock_bh(&idev->lock);
1544		list_for_each_entry(ifa, &idev->addr_list, if_list) {
1545			ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1546			if (ret)
1547				break;
1548		}
1549		read_unlock_bh(&idev->lock);
1550	}
1551	rcu_read_unlock();
1552
1553	return ret;
1554}
1555EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1556
1557int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1558{
1559	struct inet6_dev *idev;
1560	struct inet6_ifaddr *ifa;
1561	int	onlink;
1562
1563	onlink = 0;
1564	rcu_read_lock();
1565	idev = __in6_dev_get(dev);
1566	if (idev) {
1567		read_lock_bh(&idev->lock);
1568		list_for_each_entry(ifa, &idev->addr_list, if_list) {
1569			onlink = ipv6_prefix_equal(addr, &ifa->addr,
1570						   ifa->prefix_len);
1571			if (onlink)
1572				break;
1573		}
1574		read_unlock_bh(&idev->lock);
1575	}
1576	rcu_read_unlock();
1577	return onlink;
1578}
1579EXPORT_SYMBOL(ipv6_chk_prefix);
1580
1581struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1582				     struct net_device *dev, int strict)
1583{
 
1584	struct inet6_ifaddr *ifp, *result = NULL;
1585	unsigned int hash = inet6_addr_hash(addr);
1586
1587	rcu_read_lock_bh();
1588	hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
1589		if (!net_eq(dev_net(ifp->idev->dev), net))
1590			continue;
1591		if (ipv6_addr_equal(&ifp->addr, addr)) {
1592			if (dev == NULL || ifp->idev->dev == dev ||
1593			    !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1594				result = ifp;
1595				in6_ifa_hold(ifp);
1596				break;
1597			}
1598		}
1599	}
1600	rcu_read_unlock_bh();
1601
1602	return result;
1603}
1604
1605/* Gets referenced address, destroys ifaddr */
1606
1607static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1608{
1609	if (ifp->flags&IFA_F_PERMANENT) {
1610		spin_lock_bh(&ifp->lock);
1611		addrconf_del_dad_work(ifp);
1612		ifp->flags |= IFA_F_TENTATIVE;
1613		if (dad_failed)
1614			ifp->flags |= IFA_F_DADFAILED;
1615		spin_unlock_bh(&ifp->lock);
1616		if (dad_failed)
1617			ipv6_ifa_notify(0, ifp);
1618		in6_ifa_put(ifp);
1619	} else if (ifp->flags&IFA_F_TEMPORARY) {
1620		struct inet6_ifaddr *ifpub;
1621		spin_lock_bh(&ifp->lock);
1622		ifpub = ifp->ifpub;
1623		if (ifpub) {
1624			in6_ifa_hold(ifpub);
1625			spin_unlock_bh(&ifp->lock);
1626			ipv6_create_tempaddr(ifpub, ifp);
1627			in6_ifa_put(ifpub);
1628		} else {
1629			spin_unlock_bh(&ifp->lock);
1630		}
1631		ipv6_del_addr(ifp);
 
 
 
 
 
 
 
 
 
 
1632	} else {
1633		ipv6_del_addr(ifp);
1634	}
1635}
1636
1637static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1638{
1639	int err = -ENOENT;
1640
1641	spin_lock_bh(&ifp->state_lock);
1642	if (ifp->state == INET6_IFADDR_STATE_DAD) {
1643		ifp->state = INET6_IFADDR_STATE_POSTDAD;
1644		err = 0;
1645	}
1646	spin_unlock_bh(&ifp->state_lock);
1647
1648	return err;
1649}
1650
1651void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1652{
1653	struct inet6_dev *idev = ifp->idev;
 
1654
1655	if (addrconf_dad_end(ifp)) {
1656		in6_ifa_put(ifp);
1657		return;
1658	}
1659
1660	net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1661			     ifp->idev->dev->name, &ifp->addr);
1662
1663	if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1664		struct in6_addr addr;
1665
1666		addr.s6_addr32[0] = htonl(0xfe800000);
1667		addr.s6_addr32[1] = 0;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1668
1669		if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1670		    ipv6_addr_equal(&ifp->addr, &addr)) {
1671			/* DAD failed for link-local based on MAC address */
1672			idev->cnf.disable_ipv6 = 1;
1673
1674			pr_info("%s: IPv6 being disabled!\n",
1675				ifp->idev->dev->name);
1676		}
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1677	}
1678
1679	spin_lock_bh(&ifp->state_lock);
1680	/* transition from _POSTDAD to _ERRDAD */
1681	ifp->state = INET6_IFADDR_STATE_ERRDAD;
1682	spin_unlock_bh(&ifp->state_lock);
1683
1684	addrconf_mod_dad_work(ifp, 0);
 
1685}
1686
1687/* Join to solicited addr multicast group. */
1688
1689void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1690{
1691	struct in6_addr maddr;
1692
1693	ASSERT_RTNL();
1694
1695	if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1696		return;
1697
1698	addrconf_addr_solict_mult(addr, &maddr);
1699	ipv6_dev_mc_inc(dev, &maddr);
1700}
1701
 
1702void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1703{
1704	struct in6_addr maddr;
1705
1706	ASSERT_RTNL();
1707
1708	if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1709		return;
1710
1711	addrconf_addr_solict_mult(addr, &maddr);
1712	__ipv6_dev_mc_dec(idev, &maddr);
1713}
1714
 
1715static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1716{
1717	struct in6_addr addr;
1718
1719	ASSERT_RTNL();
1720
1721	if (ifp->prefix_len >= 127) /* RFC 6164 */
1722		return;
1723	ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1724	if (ipv6_addr_any(&addr))
1725		return;
1726	ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1727}
1728
 
1729static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1730{
1731	struct in6_addr addr;
1732
1733	ASSERT_RTNL();
1734
1735	if (ifp->prefix_len >= 127) /* RFC 6164 */
1736		return;
1737	ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1738	if (ipv6_addr_any(&addr))
1739		return;
1740	__ipv6_dev_ac_dec(ifp->idev, &addr);
1741}
1742
1743static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1744{
1745	if (dev->addr_len != ETH_ALEN)
1746		return -1;
1747	memcpy(eui, dev->dev_addr, 3);
1748	memcpy(eui + 5, dev->dev_addr + 3, 3);
1749
1750	/*
1751	 * The zSeries OSA network cards can be shared among various
1752	 * OS instances, but the OSA cards have only one MAC address.
1753	 * This leads to duplicate address conflicts in conjunction
1754	 * with IPv6 if more than one instance uses the same card.
1755	 *
1756	 * The driver for these cards can deliver a unique 16-bit
1757	 * identifier for each instance sharing the same card.  It is
1758	 * placed instead of 0xFFFE in the interface identifier.  The
1759	 * "u" bit of the interface identifier is not inverted in this
1760	 * case.  Hence the resulting interface identifier has local
1761	 * scope according to RFC2373.
1762	 */
1763	if (dev->dev_id) {
1764		eui[3] = (dev->dev_id >> 8) & 0xFF;
1765		eui[4] = dev->dev_id & 0xFF;
1766	} else {
1767		eui[3] = 0xFF;
1768		eui[4] = 0xFE;
 
 
 
 
1769		eui[0] ^= 2;
 
 
 
1770	}
1771	return 0;
1772}
1773
1774static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1775{
1776	if (dev->addr_len != IEEE802154_ADDR_LEN)
1777		return -1;
1778	memcpy(eui, dev->dev_addr, 8);
1779	eui[0] ^= 2;
1780	return 0;
1781}
1782
1783static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
1784{
1785	union fwnet_hwaddr *ha;
1786
1787	if (dev->addr_len != FWNET_ALEN)
1788		return -1;
1789
1790	ha = (union fwnet_hwaddr *)dev->dev_addr;
1791
1792	memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
1793	eui[0] ^= 2;
1794	return 0;
1795}
1796
1797static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1798{
1799	/* XXX: inherit EUI-64 from other interface -- yoshfuji */
1800	if (dev->addr_len != ARCNET_ALEN)
1801		return -1;
1802	memset(eui, 0, 7);
1803	eui[7] = *(u8 *)dev->dev_addr;
1804	return 0;
1805}
1806
1807static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1808{
1809	if (dev->addr_len != INFINIBAND_ALEN)
1810		return -1;
1811	memcpy(eui, dev->dev_addr + 12, 8);
1812	eui[0] |= 2;
1813	return 0;
1814}
1815
1816static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1817{
1818	if (addr == 0)
1819		return -1;
1820	eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1821		  ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1822		  ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1823		  ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1824		  ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1825		  ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1826	eui[1] = 0;
1827	eui[2] = 0x5E;
1828	eui[3] = 0xFE;
1829	memcpy(eui + 4, &addr, 4);
1830	return 0;
1831}
1832
1833static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1834{
1835	if (dev->priv_flags & IFF_ISATAP)
1836		return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1837	return -1;
1838}
1839
1840static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
1841{
1842	return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1843}
1844
1845static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
1846{
1847	memcpy(eui, dev->perm_addr, 3);
1848	memcpy(eui + 5, dev->perm_addr + 3, 3);
1849	eui[3] = 0xFF;
1850	eui[4] = 0xFE;
1851	eui[0] ^= 2;
1852	return 0;
1853}
1854
1855static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1856{
1857	switch (dev->type) {
1858	case ARPHRD_ETHER:
1859	case ARPHRD_FDDI:
1860		return addrconf_ifid_eui48(eui, dev);
1861	case ARPHRD_ARCNET:
1862		return addrconf_ifid_arcnet(eui, dev);
1863	case ARPHRD_INFINIBAND:
1864		return addrconf_ifid_infiniband(eui, dev);
1865	case ARPHRD_SIT:
1866		return addrconf_ifid_sit(eui, dev);
1867	case ARPHRD_IPGRE:
 
1868		return addrconf_ifid_gre(eui, dev);
1869	case ARPHRD_6LOWPAN:
1870	case ARPHRD_IEEE802154:
1871		return addrconf_ifid_eui64(eui, dev);
1872	case ARPHRD_IEEE1394:
1873		return addrconf_ifid_ieee1394(eui, dev);
1874	case ARPHRD_TUNNEL6:
 
1875		return addrconf_ifid_ip6tnl(eui, dev);
1876	}
1877	return -1;
1878}
1879
1880static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1881{
1882	int err = -1;
1883	struct inet6_ifaddr *ifp;
1884
1885	read_lock_bh(&idev->lock);
1886	list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1887		if (ifp->scope > IFA_LINK)
1888			break;
1889		if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1890			memcpy(eui, ifp->addr.s6_addr+8, 8);
1891			err = 0;
1892			break;
1893		}
1894	}
1895	read_unlock_bh(&idev->lock);
1896	return err;
1897}
1898
1899/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1900static void __ipv6_regen_rndid(struct inet6_dev *idev)
1901{
1902regen:
1903	get_random_bytes(idev->rndid, sizeof(idev->rndid));
1904	idev->rndid[0] &= ~0x02;
1905
1906	/*
1907	 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1908	 * check if generated address is not inappropriate
1909	 *
1910	 *  - Reserved subnet anycast (RFC 2526)
1911	 *	11111101 11....11 1xxxxxxx
1912	 *  - ISATAP (RFC4214) 6.1
1913	 *	00-00-5E-FE-xx-xx-xx-xx
1914	 *  - value 0
1915	 *  - XXX: already assigned to an address on the device
1916	 */
1917	if (idev->rndid[0] == 0xfd &&
1918	    (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1919	    (idev->rndid[7]&0x80))
1920		goto regen;
1921	if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1922		if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1923			goto regen;
1924		if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1925			goto regen;
1926	}
1927}
1928
1929static void ipv6_regen_rndid(unsigned long data)
1930{
1931	struct inet6_dev *idev = (struct inet6_dev *) data;
1932	unsigned long expires;
1933
1934	rcu_read_lock_bh();
1935	write_lock_bh(&idev->lock);
1936
1937	if (idev->dead)
1938		goto out;
1939
1940	__ipv6_regen_rndid(idev);
1941
1942	expires = jiffies +
1943		idev->cnf.temp_prefered_lft * HZ -
1944		idev->cnf.regen_max_retry * idev->cnf.dad_transmits *
1945		NEIGH_VAR(idev->nd_parms, RETRANS_TIME) -
1946		idev->cnf.max_desync_factor * HZ;
1947	if (time_before(expires, jiffies)) {
1948		pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
1949			__func__, idev->dev->name);
1950		goto out;
1951	}
1952
1953	if (!mod_timer(&idev->regen_timer, expires))
1954		in6_dev_hold(idev);
1955
1956out:
1957	write_unlock_bh(&idev->lock);
1958	rcu_read_unlock_bh();
1959	in6_dev_put(idev);
1960}
1961
1962static void  __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
1963{
1964	if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1965		__ipv6_regen_rndid(idev);
1966}
1967
1968/*
1969 *	Add prefix route.
1970 */
1971
1972static void
1973addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1974		      unsigned long expires, u32 flags)
1975{
1976	struct fib6_config cfg = {
1977		.fc_table = RT6_TABLE_PREFIX,
1978		.fc_metric = IP6_RT_PRIO_ADDRCONF,
1979		.fc_ifindex = dev->ifindex,
1980		.fc_expires = expires,
1981		.fc_dst_len = plen,
1982		.fc_flags = RTF_UP | flags,
1983		.fc_nlinfo.nl_net = dev_net(dev),
1984		.fc_protocol = RTPROT_KERNEL,
1985	};
1986
1987	cfg.fc_dst = *pfx;
1988
1989	/* Prevent useless cloning on PtP SIT.
1990	   This thing is done here expecting that the whole
1991	   class of non-broadcast devices need not cloning.
1992	 */
1993#if IS_ENABLED(CONFIG_IPV6_SIT)
1994	if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1995		cfg.fc_flags |= RTF_NONEXTHOP;
1996#endif
1997
1998	ip6_route_add(&cfg);
1999}
2000
2001
2002static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2003						  int plen,
2004						  const struct net_device *dev,
2005						  u32 flags, u32 noflags)
2006{
2007	struct fib6_node *fn;
2008	struct rt6_info *rt = NULL;
2009	struct fib6_table *table;
 
2010
2011	table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX);
2012	if (table == NULL)
2013		return NULL;
2014
2015	read_lock_bh(&table->tb6_lock);
2016	fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
2017	if (!fn)
2018		goto out;
2019	for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
 
2020		if (rt->dst.dev->ifindex != dev->ifindex)
2021			continue;
2022		if ((rt->rt6i_flags & flags) != flags)
2023			continue;
2024		if ((rt->rt6i_flags & noflags) != 0)
2025			continue;
2026		dst_hold(&rt->dst);
 
2027		break;
2028	}
2029out:
2030	read_unlock_bh(&table->tb6_lock);
2031	return rt;
2032}
2033
2034
2035/* Create "default" multicast route to the interface */
2036
2037static void addrconf_add_mroute(struct net_device *dev)
2038{
2039	struct fib6_config cfg = {
2040		.fc_table = RT6_TABLE_LOCAL,
2041		.fc_metric = IP6_RT_PRIO_ADDRCONF,
2042		.fc_ifindex = dev->ifindex,
2043		.fc_dst_len = 8,
2044		.fc_flags = RTF_UP,
2045		.fc_nlinfo.nl_net = dev_net(dev),
2046	};
2047
2048	ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2049
2050	ip6_route_add(&cfg);
2051}
2052
2053static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2054{
2055	struct inet6_dev *idev;
2056
2057	ASSERT_RTNL();
2058
2059	idev = ipv6_find_idev(dev);
2060	if (!idev)
2061		return ERR_PTR(-ENOBUFS);
2062
2063	if (idev->cnf.disable_ipv6)
2064		return ERR_PTR(-EACCES);
2065
2066	/* Add default multicast route */
2067	if (!(dev->flags & IFF_LOOPBACK))
2068		addrconf_add_mroute(dev);
2069
2070	return idev;
2071}
2072
2073static void manage_tempaddrs(struct inet6_dev *idev,
2074			     struct inet6_ifaddr *ifp,
2075			     __u32 valid_lft, __u32 prefered_lft,
2076			     bool create, unsigned long now)
2077{
2078	u32 flags;
2079	struct inet6_ifaddr *ift;
2080
2081	read_lock_bh(&idev->lock);
2082	/* update all temporary addresses in the list */
2083	list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2084		int age, max_valid, max_prefered;
2085
2086		if (ifp != ift->ifpub)
2087			continue;
2088
2089		/* RFC 4941 section 3.3:
2090		 * If a received option will extend the lifetime of a public
2091		 * address, the lifetimes of temporary addresses should
2092		 * be extended, subject to the overall constraint that no
2093		 * temporary addresses should ever remain "valid" or "preferred"
2094		 * for a time longer than (TEMP_VALID_LIFETIME) or
2095		 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2096		 */
2097		age = (now - ift->cstamp) / HZ;
2098		max_valid = idev->cnf.temp_valid_lft - age;
2099		if (max_valid < 0)
2100			max_valid = 0;
2101
2102		max_prefered = idev->cnf.temp_prefered_lft -
2103			       idev->cnf.max_desync_factor - age;
2104		if (max_prefered < 0)
2105			max_prefered = 0;
2106
2107		if (valid_lft > max_valid)
2108			valid_lft = max_valid;
2109
2110		if (prefered_lft > max_prefered)
2111			prefered_lft = max_prefered;
2112
2113		spin_lock(&ift->lock);
2114		flags = ift->flags;
2115		ift->valid_lft = valid_lft;
2116		ift->prefered_lft = prefered_lft;
2117		ift->tstamp = now;
2118		if (prefered_lft > 0)
2119			ift->flags &= ~IFA_F_DEPRECATED;
2120
2121		spin_unlock(&ift->lock);
2122		if (!(flags&IFA_F_TENTATIVE))
2123			ipv6_ifa_notify(0, ift);
2124	}
2125
2126	if ((create || list_empty(&idev->tempaddr_list)) &&
2127	    idev->cnf.use_tempaddr > 0) {
2128		/* When a new public address is created as described
2129		 * in [ADDRCONF], also create a new temporary address.
2130		 * Also create a temporary address if it's enabled but
2131		 * no temporary address currently exists.
2132		 */
2133		read_unlock_bh(&idev->lock);
2134		ipv6_create_tempaddr(ifp, NULL);
2135	} else {
2136		read_unlock_bh(&idev->lock);
2137	}
2138}
2139
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2140void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2141{
2142	struct prefix_info *pinfo;
2143	__u32 valid_lft;
2144	__u32 prefered_lft;
2145	int addr_type;
 
2146	struct inet6_dev *in6_dev;
2147	struct net *net = dev_net(dev);
2148
2149	pinfo = (struct prefix_info *) opt;
2150
2151	if (len < sizeof(struct prefix_info)) {
2152		ADBG("addrconf: prefix option too short\n");
2153		return;
2154	}
2155
2156	/*
2157	 *	Validation checks ([ADDRCONF], page 19)
2158	 */
2159
2160	addr_type = ipv6_addr_type(&pinfo->prefix);
2161
2162	if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2163		return;
2164
2165	valid_lft = ntohl(pinfo->valid);
2166	prefered_lft = ntohl(pinfo->prefered);
2167
2168	if (prefered_lft > valid_lft) {
2169		net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2170		return;
2171	}
2172
2173	in6_dev = in6_dev_get(dev);
2174
2175	if (in6_dev == NULL) {
2176		net_dbg_ratelimited("addrconf: device %s not configured\n",
2177				    dev->name);
2178		return;
2179	}
2180
2181	/*
2182	 *	Two things going on here:
2183	 *	1) Add routes for on-link prefixes
2184	 *	2) Configure prefixes with the auto flag set
2185	 */
2186
2187	if (pinfo->onlink) {
2188		struct rt6_info *rt;
2189		unsigned long rt_expires;
2190
2191		/* Avoid arithmetic overflow. Really, we could
2192		 * save rt_expires in seconds, likely valid_lft,
2193		 * but it would require division in fib gc, that it
2194		 * not good.
2195		 */
2196		if (HZ > USER_HZ)
2197			rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2198		else
2199			rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2200
2201		if (addrconf_finite_timeout(rt_expires))
2202			rt_expires *= HZ;
2203
2204		rt = addrconf_get_prefix_route(&pinfo->prefix,
2205					       pinfo->prefix_len,
2206					       dev,
2207					       RTF_ADDRCONF | RTF_PREFIX_RT,
2208					       RTF_GATEWAY | RTF_DEFAULT);
2209
2210		if (rt) {
2211			/* Autoconf prefix route */
2212			if (valid_lft == 0) {
2213				ip6_del_rt(rt);
2214				rt = NULL;
2215			} else if (addrconf_finite_timeout(rt_expires)) {
2216				/* not infinity */
2217				rt6_set_expires(rt, jiffies + rt_expires);
2218			} else {
2219				rt6_clean_expires(rt);
2220			}
2221		} else if (valid_lft) {
2222			clock_t expires = 0;
2223			int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2224			if (addrconf_finite_timeout(rt_expires)) {
2225				/* not infinity */
2226				flags |= RTF_EXPIRES;
2227				expires = jiffies_to_clock_t(rt_expires);
2228			}
2229			addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2230					      dev, expires, flags);
2231		}
2232		ip6_rt_put(rt);
2233	}
2234
2235	/* Try to figure out our local address for this prefix */
2236
2237	if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2238		struct inet6_ifaddr *ifp;
2239		struct in6_addr addr;
2240		int create = 0, update_lft = 0;
2241		bool tokenized = false;
2242
2243		if (pinfo->prefix_len == 64) {
2244			memcpy(&addr, &pinfo->prefix, 8);
2245
2246			if (!ipv6_addr_any(&in6_dev->token)) {
2247				read_lock_bh(&in6_dev->lock);
2248				memcpy(addr.s6_addr + 8,
2249				       in6_dev->token.s6_addr + 8, 8);
2250				read_unlock_bh(&in6_dev->lock);
2251				tokenized = true;
 
 
 
 
 
2252			} else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2253				   ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2254				in6_dev_put(in6_dev);
2255				return;
 
2256			}
2257			goto ok;
2258		}
2259		net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2260				    pinfo->prefix_len);
2261		in6_dev_put(in6_dev);
2262		return;
2263
2264ok:
 
 
 
 
 
 
 
2265
2266		ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
2267
2268		if (ifp == NULL && valid_lft) {
2269			int max_addresses = in6_dev->cnf.max_addresses;
2270			u32 addr_flags = 0;
2271
2272#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2273			if (in6_dev->cnf.optimistic_dad &&
2274			    !net->ipv6.devconf_all->forwarding && sllao)
2275				addr_flags = IFA_F_OPTIMISTIC;
2276#endif
2277
2278			/* Do not allow to create too much of autoconfigured
2279			 * addresses; this would be too easy way to crash kernel.
2280			 */
2281			if (!max_addresses ||
2282			    ipv6_count_addresses(in6_dev) < max_addresses)
2283				ifp = ipv6_add_addr(in6_dev, &addr, NULL,
2284						    pinfo->prefix_len,
2285						    addr_type&IPV6_ADDR_SCOPE_MASK,
2286						    addr_flags, valid_lft,
2287						    prefered_lft);
2288
2289			if (IS_ERR_OR_NULL(ifp)) {
2290				in6_dev_put(in6_dev);
2291				return;
2292			}
2293
2294			update_lft = 0;
2295			create = 1;
2296			spin_lock_bh(&ifp->lock);
2297			ifp->flags |= IFA_F_MANAGETEMPADDR;
2298			ifp->cstamp = jiffies;
2299			ifp->tokenized = tokenized;
2300			spin_unlock_bh(&ifp->lock);
2301			addrconf_dad_start(ifp);
2302		}
2303
2304		if (ifp) {
2305			u32 flags;
2306			unsigned long now;
2307			u32 stored_lft;
2308
2309			/* update lifetime (RFC2462 5.5.3 e) */
2310			spin_lock(&ifp->lock);
2311			now = jiffies;
2312			if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2313				stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2314			else
2315				stored_lft = 0;
2316			if (!update_lft && !create && stored_lft) {
2317				const u32 minimum_lft = min(
2318					stored_lft, (u32)MIN_VALID_LIFETIME);
2319				valid_lft = max(valid_lft, minimum_lft);
2320
2321				/* RFC4862 Section 5.5.3e:
2322				 * "Note that the preferred lifetime of the
2323				 *  corresponding address is always reset to
2324				 *  the Preferred Lifetime in the received
2325				 *  Prefix Information option, regardless of
2326				 *  whether the valid lifetime is also reset or
2327				 *  ignored."
2328				 *
2329				 * So we should always update prefered_lft here.
2330				 */
2331				update_lft = 1;
2332			}
2333
2334			if (update_lft) {
2335				ifp->valid_lft = valid_lft;
2336				ifp->prefered_lft = prefered_lft;
2337				ifp->tstamp = now;
2338				flags = ifp->flags;
2339				ifp->flags &= ~IFA_F_DEPRECATED;
2340				spin_unlock(&ifp->lock);
2341
2342				if (!(flags&IFA_F_TENTATIVE))
2343					ipv6_ifa_notify(0, ifp);
2344			} else
2345				spin_unlock(&ifp->lock);
2346
2347			manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2348					 create, now);
2349
2350			in6_ifa_put(ifp);
2351			addrconf_verify();
2352		}
2353	}
2354	inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
 
2355	in6_dev_put(in6_dev);
2356}
2357
2358/*
2359 *	Set destination address.
2360 *	Special case for SIT interfaces where we create a new "virtual"
2361 *	device.
2362 */
2363int addrconf_set_dstaddr(struct net *net, void __user *arg)
2364{
2365	struct in6_ifreq ireq;
2366	struct net_device *dev;
2367	int err = -EINVAL;
2368
2369	rtnl_lock();
2370
2371	err = -EFAULT;
2372	if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2373		goto err_exit;
2374
2375	dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2376
2377	err = -ENODEV;
2378	if (dev == NULL)
2379		goto err_exit;
2380
2381#if IS_ENABLED(CONFIG_IPV6_SIT)
2382	if (dev->type == ARPHRD_SIT) {
2383		const struct net_device_ops *ops = dev->netdev_ops;
2384		struct ifreq ifr;
2385		struct ip_tunnel_parm p;
2386
2387		err = -EADDRNOTAVAIL;
2388		if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2389			goto err_exit;
2390
2391		memset(&p, 0, sizeof(p));
2392		p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2393		p.iph.saddr = 0;
2394		p.iph.version = 4;
2395		p.iph.ihl = 5;
2396		p.iph.protocol = IPPROTO_IPV6;
2397		p.iph.ttl = 64;
2398		ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2399
2400		if (ops->ndo_do_ioctl) {
2401			mm_segment_t oldfs = get_fs();
2402
2403			set_fs(KERNEL_DS);
2404			err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2405			set_fs(oldfs);
2406		} else
2407			err = -EOPNOTSUPP;
2408
2409		if (err == 0) {
2410			err = -ENOBUFS;
2411			dev = __dev_get_by_name(net, p.name);
2412			if (!dev)
2413				goto err_exit;
2414			err = dev_open(dev);
2415		}
2416	}
2417#endif
2418
2419err_exit:
2420	rtnl_unlock();
2421	return err;
2422}
2423
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2424/*
2425 *	Manual configuration of address on an interface
2426 */
2427static int inet6_addr_add(struct net *net, int ifindex,
2428			  const struct in6_addr *pfx,
2429			  const struct in6_addr *peer_pfx,
2430			  unsigned int plen, __u32 ifa_flags,
2431			  __u32 prefered_lft, __u32 valid_lft)
 
2432{
2433	struct inet6_ifaddr *ifp;
2434	struct inet6_dev *idev;
2435	struct net_device *dev;
 
 
2436	int scope;
2437	u32 flags;
2438	clock_t expires;
2439	unsigned long timeout;
2440
2441	ASSERT_RTNL();
2442
2443	if (plen > 128)
2444		return -EINVAL;
2445
2446	/* check the lifetime */
2447	if (!valid_lft || prefered_lft > valid_lft)
2448		return -EINVAL;
2449
2450	if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2451		return -EINVAL;
2452
2453	dev = __dev_get_by_index(net, ifindex);
2454	if (!dev)
2455		return -ENODEV;
2456
2457	idev = addrconf_add_dev(dev);
2458	if (IS_ERR(idev))
2459		return PTR_ERR(idev);
2460
 
 
 
 
 
 
 
 
2461	scope = ipv6_addr_scope(pfx);
2462
2463	timeout = addrconf_timeout_fixup(valid_lft, HZ);
2464	if (addrconf_finite_timeout(timeout)) {
2465		expires = jiffies_to_clock_t(timeout * HZ);
2466		valid_lft = timeout;
2467		flags = RTF_EXPIRES;
2468	} else {
2469		expires = 0;
2470		flags = 0;
2471		ifa_flags |= IFA_F_PERMANENT;
2472	}
2473
2474	timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2475	if (addrconf_finite_timeout(timeout)) {
2476		if (timeout == 0)
2477			ifa_flags |= IFA_F_DEPRECATED;
2478		prefered_lft = timeout;
2479	}
2480
2481	ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2482			    valid_lft, prefered_lft);
2483
2484	if (!IS_ERR(ifp)) {
2485		if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
2486			addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2487					      expires, flags);
2488		}
2489
2490		/*
2491		 * Note that section 3.1 of RFC 4429 indicates
2492		 * that the Optimistic flag should not be set for
2493		 * manually configured addresses
2494		 */
2495		addrconf_dad_start(ifp);
2496		if (ifa_flags & IFA_F_MANAGETEMPADDR)
2497			manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2498					 true, jiffies);
2499		in6_ifa_put(ifp);
2500		addrconf_verify_rtnl();
2501		return 0;
 
 
 
2502	}
2503
2504	return PTR_ERR(ifp);
2505}
2506
2507static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx,
2508			  unsigned int plen)
2509{
2510	struct inet6_ifaddr *ifp;
2511	struct inet6_dev *idev;
2512	struct net_device *dev;
2513
2514	if (plen > 128)
2515		return -EINVAL;
2516
2517	dev = __dev_get_by_index(net, ifindex);
2518	if (!dev)
2519		return -ENODEV;
2520
2521	if ((idev = __in6_dev_get(dev)) == NULL)
 
2522		return -ENXIO;
2523
2524	read_lock_bh(&idev->lock);
2525	list_for_each_entry(ifp, &idev->addr_list, if_list) {
2526		if (ifp->prefix_len == plen &&
2527		    ipv6_addr_equal(pfx, &ifp->addr)) {
2528			in6_ifa_hold(ifp);
2529			read_unlock_bh(&idev->lock);
2530
 
 
 
 
2531			ipv6_del_addr(ifp);
 
 
 
 
 
2532			return 0;
2533		}
2534	}
2535	read_unlock_bh(&idev->lock);
2536	return -EADDRNOTAVAIL;
2537}
2538
2539
2540int addrconf_add_ifaddr(struct net *net, void __user *arg)
2541{
2542	struct in6_ifreq ireq;
2543	int err;
2544
2545	if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2546		return -EPERM;
2547
2548	if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2549		return -EFAULT;
2550
2551	rtnl_lock();
2552	err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
2553			     ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2554			     INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2555	rtnl_unlock();
2556	return err;
2557}
2558
2559int addrconf_del_ifaddr(struct net *net, void __user *arg)
2560{
2561	struct in6_ifreq ireq;
2562	int err;
2563
2564	if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2565		return -EPERM;
2566
2567	if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2568		return -EFAULT;
2569
2570	rtnl_lock();
2571	err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2572			     ireq.ifr6_prefixlen);
2573	rtnl_unlock();
2574	return err;
2575}
2576
2577static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2578		     int plen, int scope)
2579{
2580	struct inet6_ifaddr *ifp;
2581
2582	ifp = ipv6_add_addr(idev, addr, NULL, plen,
2583			    scope, IFA_F_PERMANENT,
2584			    INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
 
2585	if (!IS_ERR(ifp)) {
2586		spin_lock_bh(&ifp->lock);
2587		ifp->flags &= ~IFA_F_TENTATIVE;
2588		spin_unlock_bh(&ifp->lock);
 
2589		ipv6_ifa_notify(RTM_NEWADDR, ifp);
2590		in6_ifa_put(ifp);
2591	}
2592}
2593
2594#if IS_ENABLED(CONFIG_IPV6_SIT)
2595static void sit_add_v4_addrs(struct inet6_dev *idev)
2596{
2597	struct in6_addr addr;
2598	struct net_device *dev;
2599	struct net *net = dev_net(idev->dev);
2600	int scope, plen;
2601	u32 pflags = 0;
2602
2603	ASSERT_RTNL();
2604
2605	memset(&addr, 0, sizeof(struct in6_addr));
2606	memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2607
2608	if (idev->dev->flags&IFF_POINTOPOINT) {
2609		addr.s6_addr32[0] = htonl(0xfe800000);
2610		scope = IFA_LINK;
2611		plen = 64;
2612	} else {
2613		scope = IPV6_ADDR_COMPATv4;
2614		plen = 96;
2615		pflags |= RTF_NONEXTHOP;
2616	}
2617
2618	if (addr.s6_addr32[3]) {
2619		add_addr(idev, &addr, plen, scope);
2620		addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
2621		return;
2622	}
2623
2624	for_each_netdev(net, dev) {
2625		struct in_device *in_dev = __in_dev_get_rtnl(dev);
2626		if (in_dev && (dev->flags & IFF_UP)) {
2627			struct in_ifaddr *ifa;
2628
2629			int flag = scope;
2630
2631			for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2632
2633				addr.s6_addr32[3] = ifa->ifa_local;
2634
2635				if (ifa->ifa_scope == RT_SCOPE_LINK)
2636					continue;
2637				if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2638					if (idev->dev->flags&IFF_POINTOPOINT)
2639						continue;
2640					flag |= IFA_HOST;
2641				}
2642
2643				add_addr(idev, &addr, plen, flag);
2644				addrconf_prefix_route(&addr, plen, idev->dev, 0,
2645						      pflags);
2646			}
2647		}
2648	}
2649}
2650#endif
2651
2652static void init_loopback(struct net_device *dev)
2653{
2654	struct inet6_dev  *idev;
2655	struct net_device *sp_dev;
2656	struct inet6_ifaddr *sp_ifa;
2657	struct rt6_info *sp_rt;
2658
2659	/* ::1 */
2660
2661	ASSERT_RTNL();
2662
2663	if ((idev = ipv6_find_idev(dev)) == NULL) {
 
2664		pr_debug("%s: add_dev failed\n", __func__);
2665		return;
2666	}
2667
2668	add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2669
2670	/* Add routes to other interface's IPv6 addresses */
2671	for_each_netdev(dev_net(dev), sp_dev) {
2672		if (!strcmp(sp_dev->name, dev->name))
2673			continue;
2674
2675		idev = __in6_dev_get(sp_dev);
2676		if (!idev)
2677			continue;
2678
2679		read_lock_bh(&idev->lock);
2680		list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
2681
2682			if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
2683				continue;
2684
2685			if (sp_ifa->rt) {
2686				/* This dst has been added to garbage list when
2687				 * lo device down, release this obsolete dst and
2688				 * reallocate a new router for ifa.
2689				 */
2690				if (sp_ifa->rt->dst.obsolete > 0) {
2691					ip6_rt_put(sp_ifa->rt);
2692					sp_ifa->rt = NULL;
2693				} else {
2694					continue;
2695				}
2696			}
2697
2698			sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false);
2699
2700			/* Failure cases are ignored */
2701			if (!IS_ERR(sp_rt)) {
2702				sp_ifa->rt = sp_rt;
2703				ip6_ins_rt(sp_rt);
2704			}
2705		}
2706		read_unlock_bh(&idev->lock);
2707	}
2708}
2709
2710static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr)
 
2711{
2712	struct inet6_ifaddr *ifp;
2713	u32 addr_flags = IFA_F_PERMANENT;
2714
2715#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2716	if (idev->cnf.optimistic_dad &&
 
2717	    !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2718		addr_flags |= IFA_F_OPTIMISTIC;
2719#endif
2720
2721
2722	ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
2723			    INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2724	if (!IS_ERR(ifp)) {
2725		addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2726		addrconf_dad_start(ifp);
2727		in6_ifa_put(ifp);
2728	}
2729}
 
2730
2731static void addrconf_dev_config(struct net_device *dev)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2732{
2733	struct in6_addr addr;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2734	struct inet6_dev *idev;
2735
2736	ASSERT_RTNL();
2737
2738	if ((dev->type != ARPHRD_ETHER) &&
2739	    (dev->type != ARPHRD_FDDI) &&
2740	    (dev->type != ARPHRD_ARCNET) &&
2741	    (dev->type != ARPHRD_INFINIBAND) &&
2742	    (dev->type != ARPHRD_IEEE802154) &&
2743	    (dev->type != ARPHRD_IEEE1394) &&
2744	    (dev->type != ARPHRD_TUNNEL6) &&
2745	    (dev->type != ARPHRD_6LOWPAN)) {
 
 
 
 
2746		/* Alas, we support only Ethernet autoconfiguration. */
2747		return;
2748	}
2749
2750	idev = addrconf_add_dev(dev);
2751	if (IS_ERR(idev))
2752		return;
2753
2754	memset(&addr, 0, sizeof(struct in6_addr));
2755	addr.s6_addr32[0] = htonl(0xFE800000);
 
 
2756
2757	if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2758		addrconf_add_linklocal(idev, &addr);
2759}
2760
2761#if IS_ENABLED(CONFIG_IPV6_SIT)
2762static void addrconf_sit_config(struct net_device *dev)
2763{
2764	struct inet6_dev *idev;
2765
2766	ASSERT_RTNL();
2767
2768	/*
2769	 * Configure the tunnel with one of our IPv4
2770	 * addresses... we should configure all of
2771	 * our v4 addrs in the tunnel
2772	 */
2773
2774	if ((idev = ipv6_find_idev(dev)) == NULL) {
 
2775		pr_debug("%s: add_dev failed\n", __func__);
2776		return;
2777	}
2778
2779	if (dev->priv_flags & IFF_ISATAP) {
2780		struct in6_addr addr;
2781
2782		ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
2783		if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2784			addrconf_add_linklocal(idev, &addr);
2785		return;
2786	}
2787
2788	sit_add_v4_addrs(idev);
2789
2790	if (dev->flags&IFF_POINTOPOINT)
2791		addrconf_add_mroute(dev);
2792}
2793#endif
2794
2795#if IS_ENABLED(CONFIG_NET_IPGRE)
2796static void addrconf_gre_config(struct net_device *dev)
2797{
2798	struct inet6_dev *idev;
2799	struct in6_addr addr;
2800
2801	ASSERT_RTNL();
2802
2803	if ((idev = ipv6_find_idev(dev)) == NULL) {
 
2804		pr_debug("%s: add_dev failed\n", __func__);
2805		return;
2806	}
2807
2808	ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
2809	if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2810		addrconf_add_linklocal(idev, &addr);
2811	else
2812		addrconf_prefix_route(&addr, 64, dev, 0, 0);
2813}
2814#endif
2815
2816static inline int
2817ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2818{
2819	struct in6_addr lladdr;
 
 
 
 
 
2820
2821	if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2822		addrconf_add_linklocal(idev, &lladdr);
2823		return 0;
 
 
 
 
 
 
 
 
2824	}
2825	return -1;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2826}
2827
2828static int addrconf_notify(struct notifier_block *this, unsigned long event,
2829			   void *ptr)
2830{
2831	struct net_device *dev = netdev_notifier_info_to_dev(ptr);
 
2832	struct inet6_dev *idev = __in6_dev_get(dev);
 
2833	int run_pending = 0;
2834	int err;
2835
2836	switch (event) {
2837	case NETDEV_REGISTER:
2838		if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2839			idev = ipv6_add_dev(dev);
2840			if (!idev)
2841				return notifier_from_errno(-ENOMEM);
2842		}
2843		break;
2844
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2845	case NETDEV_UP:
2846	case NETDEV_CHANGE:
2847		if (dev->flags & IFF_SLAVE)
2848			break;
2849
 
 
 
2850		if (event == NETDEV_UP) {
2851			if (!addrconf_qdisc_ok(dev)) {
 
 
 
2852				/* device is not ready yet. */
2853				pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
2854					dev->name);
2855				break;
2856			}
2857
2858			if (!idev && dev->mtu >= IPV6_MIN_MTU)
2859				idev = ipv6_add_dev(dev);
2860
2861			if (idev) {
2862				idev->if_flags |= IF_READY;
2863				run_pending = 1;
2864			}
2865		} else {
2866			if (!addrconf_qdisc_ok(dev)) {
2867				/* device is still not ready. */
 
2868				break;
2869			}
2870
2871			if (idev) {
2872				if (idev->if_flags & IF_READY)
2873					/* device is already configured. */
 
 
 
 
 
 
2874					break;
 
2875				idev->if_flags |= IF_READY;
2876			}
2877
2878			pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
2879				dev->name);
2880
2881			run_pending = 1;
2882		}
2883
2884		switch (dev->type) {
2885#if IS_ENABLED(CONFIG_IPV6_SIT)
2886		case ARPHRD_SIT:
2887			addrconf_sit_config(dev);
2888			break;
2889#endif
2890#if IS_ENABLED(CONFIG_NET_IPGRE)
2891		case ARPHRD_IPGRE:
2892			addrconf_gre_config(dev);
2893			break;
2894#endif
2895		case ARPHRD_LOOPBACK:
2896			init_loopback(dev);
2897			break;
2898
2899		default:
2900			addrconf_dev_config(dev);
2901			break;
2902		}
2903
2904		if (idev) {
2905			if (run_pending)
2906				addrconf_dad_run(idev);
2907
 
 
 
2908			/*
2909			 * If the MTU changed during the interface down,
2910			 * when the interface up, the changed MTU must be
2911			 * reflected in the idev as well as routers.
2912			 */
2913			if (idev->cnf.mtu6 != dev->mtu &&
2914			    dev->mtu >= IPV6_MIN_MTU) {
2915				rt6_mtu_change(dev, dev->mtu);
2916				idev->cnf.mtu6 = dev->mtu;
2917			}
2918			idev->tstamp = jiffies;
2919			inet6_ifinfo_notify(RTM_NEWLINK, idev);
2920
2921			/*
2922			 * If the changed mtu during down is lower than
2923			 * IPV6_MIN_MTU stop IPv6 on this interface.
2924			 */
2925			if (dev->mtu < IPV6_MIN_MTU)
2926				addrconf_ifdown(dev, 1);
2927		}
2928		break;
2929
2930	case NETDEV_CHANGEMTU:
2931		if (idev && dev->mtu >= IPV6_MIN_MTU) {
2932			rt6_mtu_change(dev, dev->mtu);
2933			idev->cnf.mtu6 = dev->mtu;
2934			break;
2935		}
2936
2937		if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2938			idev = ipv6_add_dev(dev);
2939			if (idev)
2940				break;
2941		}
2942
2943		/*
2944		 * if MTU under IPV6_MIN_MTU.
2945		 * Stop IPv6 on this interface.
2946		 */
2947
2948	case NETDEV_DOWN:
2949	case NETDEV_UNREGISTER:
2950		/*
2951		 *	Remove all addresses from this interface.
2952		 */
2953		addrconf_ifdown(dev, event != NETDEV_DOWN);
2954		break;
2955
2956	case NETDEV_CHANGENAME:
2957		if (idev) {
2958			snmp6_unregister_dev(idev);
2959			addrconf_sysctl_unregister(idev);
2960			addrconf_sysctl_register(idev);
2961			err = snmp6_register_dev(idev);
2962			if (err)
2963				return notifier_from_errno(err);
 
 
 
 
 
2964		}
2965		break;
2966
2967	case NETDEV_PRE_TYPE_CHANGE:
2968	case NETDEV_POST_TYPE_CHANGE:
2969		addrconf_type_change(dev, event);
 
2970		break;
 
 
 
 
 
 
 
 
 
2971	}
2972
2973	return NOTIFY_OK;
2974}
2975
2976/*
2977 *	addrconf module should be notified of a device going up
2978 */
2979static struct notifier_block ipv6_dev_notf = {
2980	.notifier_call = addrconf_notify,
 
2981};
2982
2983static void addrconf_type_change(struct net_device *dev, unsigned long event)
2984{
2985	struct inet6_dev *idev;
2986	ASSERT_RTNL();
2987
2988	idev = __in6_dev_get(dev);
2989
2990	if (event == NETDEV_POST_TYPE_CHANGE)
2991		ipv6_mc_remap(idev);
2992	else if (event == NETDEV_PRE_TYPE_CHANGE)
2993		ipv6_mc_unmap(idev);
2994}
2995
 
 
 
 
 
 
2996static int addrconf_ifdown(struct net_device *dev, int how)
2997{
 
2998	struct net *net = dev_net(dev);
2999	struct inet6_dev *idev;
3000	struct inet6_ifaddr *ifa;
 
 
3001	int state, i;
3002
3003	ASSERT_RTNL();
3004
3005	rt6_ifdown(net, dev);
3006	neigh_ifdown(&nd_tbl, dev);
3007
3008	idev = __in6_dev_get(dev);
3009	if (idev == NULL)
3010		return -ENODEV;
3011
3012	/*
3013	 * Step 1: remove reference to ipv6 device from parent device.
3014	 *	   Do not dev_put!
3015	 */
3016	if (how) {
3017		idev->dead = 1;
3018
3019		/* protected by rtnl_lock */
3020		RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3021
3022		/* Step 1.5: remove snmp6 entry */
3023		snmp6_unregister_dev(idev);
3024
3025	}
3026
 
 
 
 
 
 
 
 
 
 
3027	/* Step 2: clear hash table */
3028	for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3029		struct hlist_head *h = &inet6_addr_lst[i];
3030
3031		spin_lock_bh(&addrconf_hash_lock);
3032	restart:
3033		hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3034			if (ifa->idev == idev) {
3035				hlist_del_init_rcu(&ifa->addr_lst);
3036				addrconf_del_dad_work(ifa);
3037				goto restart;
 
 
 
 
 
 
 
 
3038			}
3039		}
3040		spin_unlock_bh(&addrconf_hash_lock);
3041	}
3042
3043	write_lock_bh(&idev->lock);
3044
3045	addrconf_del_rs_timer(idev);
3046
3047	/* Step 2: clear flags for stateless addrconf */
3048	if (!how)
3049		idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3050
3051	if (how && del_timer(&idev->regen_timer))
3052		in6_dev_put(idev);
3053
3054	/* Step 3: clear tempaddr list */
3055	while (!list_empty(&idev->tempaddr_list)) {
3056		ifa = list_first_entry(&idev->tempaddr_list,
3057				       struct inet6_ifaddr, tmp_list);
3058		list_del(&ifa->tmp_list);
3059		write_unlock_bh(&idev->lock);
3060		spin_lock_bh(&ifa->lock);
3061
3062		if (ifa->ifpub) {
3063			in6_ifa_put(ifa->ifpub);
3064			ifa->ifpub = NULL;
3065		}
3066		spin_unlock_bh(&ifa->lock);
3067		in6_ifa_put(ifa);
3068		write_lock_bh(&idev->lock);
3069	}
3070
3071	while (!list_empty(&idev->addr_list)) {
3072		ifa = list_first_entry(&idev->addr_list,
3073				       struct inet6_ifaddr, if_list);
 
 
 
 
 
 
3074		addrconf_del_dad_work(ifa);
3075
3076		list_del(&ifa->if_list);
 
3077
3078		write_unlock_bh(&idev->lock);
 
3079
3080		spin_lock_bh(&ifa->state_lock);
3081		state = ifa->state;
3082		ifa->state = INET6_IFADDR_STATE_DEAD;
3083		spin_unlock_bh(&ifa->state_lock);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
3084
3085		if (state != INET6_IFADDR_STATE_DEAD) {
3086			__ipv6_ifa_notify(RTM_DELADDR, ifa);
3087			inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
 
 
 
 
3088		}
3089		in6_ifa_put(ifa);
3090
3091		write_lock_bh(&idev->lock);
 
 
 
 
3092	}
3093
3094	write_unlock_bh(&idev->lock);
3095
3096	/* Step 5: Discard multicast list */
3097	if (how)
 
3098		ipv6_mc_destroy_dev(idev);
3099	else
3100		ipv6_mc_down(idev);
 
3101
3102	idev->tstamp = jiffies;
3103
3104	/* Last: Shot the device (if unregistered) */
3105	if (how) {
3106		addrconf_sysctl_unregister(idev);
3107		neigh_parms_release(&nd_tbl, idev->nd_parms);
3108		neigh_ifdown(&nd_tbl, dev);
3109		in6_dev_put(idev);
3110	}
3111	return 0;
3112}
3113
3114static void addrconf_rs_timer(unsigned long data)
3115{
3116	struct inet6_dev *idev = (struct inet6_dev *)data;
3117	struct net_device *dev = idev->dev;
3118	struct in6_addr lladdr;
3119
3120	write_lock(&idev->lock);
3121	if (idev->dead || !(idev->if_flags & IF_READY))
3122		goto out;
3123
3124	if (!ipv6_accept_ra(idev))
3125		goto out;
3126
3127	/* Announcement received after solicitation was sent */
3128	if (idev->if_flags & IF_RA_RCVD)
3129		goto out;
3130
3131	if (idev->rs_probes++ < idev->cnf.rtr_solicits) {
3132		write_unlock(&idev->lock);
3133		if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3134			ndisc_send_rs(dev, &lladdr,
3135				      &in6addr_linklocal_allrouters);
3136		else
3137			goto put;
3138
3139		write_lock(&idev->lock);
 
 
3140		/* The wait after the last probe can be shorter */
3141		addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3142					     idev->cnf.rtr_solicits) ?
3143				      idev->cnf.rtr_solicit_delay :
3144				      idev->cnf.rtr_solicit_interval);
3145	} else {
3146		/*
3147		 * Note: we do not support deprecated "all on-link"
3148		 * assumption any longer.
3149		 */
3150		pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3151	}
3152
3153out:
3154	write_unlock(&idev->lock);
3155put:
3156	in6_dev_put(idev);
3157}
3158
3159/*
3160 *	Duplicate Address Detection
3161 */
3162static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3163{
3164	unsigned long rand_num;
3165	struct inet6_dev *idev = ifp->idev;
 
3166
3167	if (ifp->flags & IFA_F_OPTIMISTIC)
3168		rand_num = 0;
3169	else
3170		rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
3171
 
 
 
 
 
 
 
 
3172	ifp->dad_probes = idev->cnf.dad_transmits;
3173	addrconf_mod_dad_work(ifp, rand_num);
3174}
3175
3176static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
3177{
3178	struct inet6_dev *idev = ifp->idev;
3179	struct net_device *dev = idev->dev;
 
3180
3181	addrconf_join_solict(dev, &ifp->addr);
3182
3183	prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
3184
3185	read_lock_bh(&idev->lock);
3186	spin_lock(&ifp->lock);
3187	if (ifp->state == INET6_IFADDR_STATE_DEAD)
3188		goto out;
3189
3190	if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3191	    idev->cnf.accept_dad < 1 ||
 
3192	    !(ifp->flags&IFA_F_TENTATIVE) ||
3193	    ifp->flags & IFA_F_NODAD) {
 
 
 
 
 
 
3194		ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3195		spin_unlock(&ifp->lock);
3196		read_unlock_bh(&idev->lock);
3197
3198		addrconf_dad_completed(ifp);
3199		return;
3200	}
3201
3202	if (!(idev->if_flags & IF_READY)) {
3203		spin_unlock(&ifp->lock);
3204		read_unlock_bh(&idev->lock);
3205		/*
3206		 * If the device is not ready:
3207		 * - keep it tentative if it is a permanent address.
3208		 * - otherwise, kill it.
3209		 */
3210		in6_ifa_hold(ifp);
3211		addrconf_dad_stop(ifp, 0);
3212		return;
3213	}
3214
3215	/*
3216	 * Optimistic nodes can start receiving
3217	 * Frames right away
3218	 */
3219	if (ifp->flags & IFA_F_OPTIMISTIC)
3220		ip6_ins_rt(ifp->rt);
 
 
 
 
 
 
 
3221
3222	addrconf_dad_kick(ifp);
3223out:
3224	spin_unlock(&ifp->lock);
3225	read_unlock_bh(&idev->lock);
 
 
3226}
3227
3228static void addrconf_dad_start(struct inet6_ifaddr *ifp)
3229{
3230	bool begin_dad = false;
3231
3232	spin_lock_bh(&ifp->state_lock);
3233	if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3234		ifp->state = INET6_IFADDR_STATE_PREDAD;
3235		begin_dad = true;
3236	}
3237	spin_unlock_bh(&ifp->state_lock);
3238
3239	if (begin_dad)
3240		addrconf_mod_dad_work(ifp, 0);
3241}
3242
3243static void addrconf_dad_work(struct work_struct *w)
3244{
3245	struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3246						struct inet6_ifaddr,
3247						dad_work);
3248	struct inet6_dev *idev = ifp->idev;
 
3249	struct in6_addr mcaddr;
3250
3251	enum {
3252		DAD_PROCESS,
3253		DAD_BEGIN,
3254		DAD_ABORT,
3255	} action = DAD_PROCESS;
3256
3257	rtnl_lock();
3258
3259	spin_lock_bh(&ifp->state_lock);
3260	if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3261		action = DAD_BEGIN;
3262		ifp->state = INET6_IFADDR_STATE_DAD;
3263	} else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3264		action = DAD_ABORT;
3265		ifp->state = INET6_IFADDR_STATE_POSTDAD;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
3266	}
3267	spin_unlock_bh(&ifp->state_lock);
3268
3269	if (action == DAD_BEGIN) {
3270		addrconf_dad_begin(ifp);
3271		goto out;
3272	} else if (action == DAD_ABORT) {
 
3273		addrconf_dad_stop(ifp, 1);
 
 
3274		goto out;
3275	}
3276
3277	if (!ifp->dad_probes && addrconf_dad_end(ifp))
3278		goto out;
3279
3280	write_lock_bh(&idev->lock);
3281	if (idev->dead || !(idev->if_flags & IF_READY)) {
3282		write_unlock_bh(&idev->lock);
3283		goto out;
3284	}
3285
3286	spin_lock(&ifp->lock);
3287	if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3288		spin_unlock(&ifp->lock);
3289		write_unlock_bh(&idev->lock);
3290		goto out;
3291	}
3292
3293	if (ifp->dad_probes == 0) {
 
 
3294		/*
3295		 * DAD was successful
3296		 */
3297
 
 
 
 
3298		ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3299		spin_unlock(&ifp->lock);
3300		write_unlock_bh(&idev->lock);
3301
3302		addrconf_dad_completed(ifp);
3303
3304		goto out;
3305	}
3306
3307	ifp->dad_probes--;
3308	addrconf_mod_dad_work(ifp,
3309			      NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
3310	spin_unlock(&ifp->lock);
3311	write_unlock_bh(&idev->lock);
3312
3313	/* send a neighbour solicitation for our addr */
3314	addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3315	ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
 
3316out:
3317	in6_ifa_put(ifp);
3318	rtnl_unlock();
3319}
3320
3321/* ifp->idev must be at least read locked */
3322static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
3323{
3324	struct inet6_ifaddr *ifpiter;
3325	struct inet6_dev *idev = ifp->idev;
3326
3327	list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
3328		if (ifpiter->scope > IFA_LINK)
3329			break;
3330		if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
3331		    (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
3332				       IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
3333		    IFA_F_PERMANENT)
3334			return false;
3335	}
3336	return true;
3337}
3338
3339static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
 
3340{
3341	struct net_device *dev = ifp->idev->dev;
3342	struct in6_addr lladdr;
3343	bool send_rs, send_mld;
3344
3345	addrconf_del_dad_work(ifp);
3346
3347	/*
3348	 *	Configure the address for reception. Now it is valid.
3349	 */
3350
3351	ipv6_ifa_notify(RTM_NEWADDR, ifp);
3352
3353	/* If added prefix is link local and we are prepared to process
3354	   router advertisements, start sending router solicitations.
3355	 */
3356
3357	read_lock_bh(&ifp->idev->lock);
3358	send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
3359	send_rs = send_mld &&
3360		  ipv6_accept_ra(ifp->idev) &&
3361		  ifp->idev->cnf.rtr_solicits > 0 &&
3362		  (dev->flags&IFF_LOOPBACK) == 0;
3363	read_unlock_bh(&ifp->idev->lock);
3364
3365	/* While dad is in progress mld report's source address is in6_addrany.
3366	 * Resend with proper ll now.
3367	 */
3368	if (send_mld)
3369		ipv6_mc_dad_complete(ifp->idev);
3370
 
 
 
 
 
 
 
 
 
 
3371	if (send_rs) {
3372		/*
3373		 *	If a host as already performed a random delay
3374		 *	[...] as part of DAD [...] there is no need
3375		 *	to delay again before sending the first RS
3376		 */
3377		if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3378			return;
3379		ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
3380
3381		write_lock_bh(&ifp->idev->lock);
3382		spin_lock(&ifp->lock);
 
 
3383		ifp->idev->rs_probes = 1;
3384		ifp->idev->if_flags |= IF_RS_SENT;
3385		addrconf_mod_rs_timer(ifp->idev,
3386				      ifp->idev->cnf.rtr_solicit_interval);
3387		spin_unlock(&ifp->lock);
3388		write_unlock_bh(&ifp->idev->lock);
3389	}
 
 
 
 
 
 
 
 
 
3390}
3391
3392static void addrconf_dad_run(struct inet6_dev *idev)
3393{
3394	struct inet6_ifaddr *ifp;
3395
3396	read_lock_bh(&idev->lock);
3397	list_for_each_entry(ifp, &idev->addr_list, if_list) {
3398		spin_lock(&ifp->lock);
3399		if (ifp->flags & IFA_F_TENTATIVE &&
3400		    ifp->state == INET6_IFADDR_STATE_DAD)
3401			addrconf_dad_kick(ifp);
3402		spin_unlock(&ifp->lock);
3403	}
3404	read_unlock_bh(&idev->lock);
3405}
3406
3407#ifdef CONFIG_PROC_FS
3408struct if6_iter_state {
3409	struct seq_net_private p;
3410	int bucket;
3411	int offset;
3412};
3413
3414static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
3415{
3416	struct inet6_ifaddr *ifa = NULL;
3417	struct if6_iter_state *state = seq->private;
3418	struct net *net = seq_file_net(seq);
 
3419	int p = 0;
3420
3421	/* initial bucket if pos is 0 */
3422	if (pos == 0) {
3423		state->bucket = 0;
3424		state->offset = 0;
3425	}
3426
3427	for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3428		hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
3429					 addr_lst) {
3430			if (!net_eq(dev_net(ifa->idev->dev), net))
3431				continue;
3432			/* sync with offset */
3433			if (p < state->offset) {
3434				p++;
3435				continue;
3436			}
3437			state->offset++;
3438			return ifa;
3439		}
3440
3441		/* prepare for next bucket */
3442		state->offset = 0;
3443		p = 0;
3444	}
3445	return NULL;
3446}
3447
3448static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3449					 struct inet6_ifaddr *ifa)
3450{
3451	struct if6_iter_state *state = seq->private;
3452	struct net *net = seq_file_net(seq);
3453
3454	hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
3455		if (!net_eq(dev_net(ifa->idev->dev), net))
3456			continue;
3457		state->offset++;
3458		return ifa;
3459	}
3460
3461	while (++state->bucket < IN6_ADDR_HSIZE) {
3462		state->offset = 0;
3463		hlist_for_each_entry_rcu_bh(ifa,
3464				     &inet6_addr_lst[state->bucket], addr_lst) {
3465			if (!net_eq(dev_net(ifa->idev->dev), net))
3466				continue;
3467			state->offset++;
3468			return ifa;
3469		}
3470	}
3471
3472	return NULL;
3473}
3474
3475static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3476	__acquires(rcu_bh)
3477{
3478	rcu_read_lock_bh();
3479	return if6_get_first(seq, *pos);
3480}
3481
3482static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3483{
3484	struct inet6_ifaddr *ifa;
3485
3486	ifa = if6_get_next(seq, v);
3487	++*pos;
3488	return ifa;
3489}
3490
3491static void if6_seq_stop(struct seq_file *seq, void *v)
3492	__releases(rcu_bh)
3493{
3494	rcu_read_unlock_bh();
3495}
3496
3497static int if6_seq_show(struct seq_file *seq, void *v)
3498{
3499	struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3500	seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3501		   &ifp->addr,
3502		   ifp->idev->dev->ifindex,
3503		   ifp->prefix_len,
3504		   ifp->scope,
3505		   (u8) ifp->flags,
3506		   ifp->idev->dev->name);
3507	return 0;
3508}
3509
3510static const struct seq_operations if6_seq_ops = {
3511	.start	= if6_seq_start,
3512	.next	= if6_seq_next,
3513	.show	= if6_seq_show,
3514	.stop	= if6_seq_stop,
3515};
3516
3517static int if6_seq_open(struct inode *inode, struct file *file)
3518{
3519	return seq_open_net(inode, file, &if6_seq_ops,
3520			    sizeof(struct if6_iter_state));
3521}
3522
3523static const struct file_operations if6_fops = {
3524	.owner		= THIS_MODULE,
3525	.open		= if6_seq_open,
3526	.read		= seq_read,
3527	.llseek		= seq_lseek,
3528	.release	= seq_release_net,
3529};
3530
3531static int __net_init if6_proc_net_init(struct net *net)
3532{
3533	if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
3534		return -ENOMEM;
3535	return 0;
3536}
3537
3538static void __net_exit if6_proc_net_exit(struct net *net)
3539{
3540	remove_proc_entry("if_inet6", net->proc_net);
3541}
3542
3543static struct pernet_operations if6_proc_net_ops = {
3544       .init = if6_proc_net_init,
3545       .exit = if6_proc_net_exit,
3546};
3547
3548int __init if6_proc_init(void)
3549{
3550	return register_pernet_subsys(&if6_proc_net_ops);
3551}
3552
3553void if6_proc_exit(void)
3554{
3555	unregister_pernet_subsys(&if6_proc_net_ops);
3556}
3557#endif	/* CONFIG_PROC_FS */
3558
3559#if IS_ENABLED(CONFIG_IPV6_MIP6)
3560/* Check if address is a home address configured on any interface. */
3561int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3562{
3563	int ret = 0;
3564	struct inet6_ifaddr *ifp = NULL;
3565	unsigned int hash = inet6_addr_hash(addr);
3566
3567	rcu_read_lock_bh();
3568	hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
3569		if (!net_eq(dev_net(ifp->idev->dev), net))
3570			continue;
3571		if (ipv6_addr_equal(&ifp->addr, addr) &&
3572		    (ifp->flags & IFA_F_HOMEADDRESS)) {
3573			ret = 1;
3574			break;
3575		}
3576	}
3577	rcu_read_unlock_bh();
3578	return ret;
3579}
3580#endif
3581
3582/*
3583 *	Periodic address status verification
3584 */
3585
3586static void addrconf_verify_rtnl(void)
3587{
3588	unsigned long now, next, next_sec, next_sched;
3589	struct inet6_ifaddr *ifp;
3590	int i;
3591
3592	ASSERT_RTNL();
3593
3594	rcu_read_lock_bh();
3595	now = jiffies;
3596	next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3597
3598	cancel_delayed_work(&addr_chk_work);
3599
3600	for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3601restart:
3602		hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
3603			unsigned long age;
3604
3605			/* When setting preferred_lft to a value not zero or
3606			 * infinity, while valid_lft is infinity
3607			 * IFA_F_PERMANENT has a non-infinity life time.
3608			 */
3609			if ((ifp->flags & IFA_F_PERMANENT) &&
3610			    (ifp->prefered_lft == INFINITY_LIFE_TIME))
3611				continue;
3612
3613			spin_lock(&ifp->lock);
3614			/* We try to batch several events at once. */
3615			age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3616
3617			if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3618			    age >= ifp->valid_lft) {
3619				spin_unlock(&ifp->lock);
3620				in6_ifa_hold(ifp);
3621				ipv6_del_addr(ifp);
3622				goto restart;
3623			} else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3624				spin_unlock(&ifp->lock);
3625				continue;
3626			} else if (age >= ifp->prefered_lft) {
3627				/* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3628				int deprecate = 0;
3629
3630				if (!(ifp->flags&IFA_F_DEPRECATED)) {
3631					deprecate = 1;
3632					ifp->flags |= IFA_F_DEPRECATED;
3633				}
3634
3635				if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
3636				    (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
3637					next = ifp->tstamp + ifp->valid_lft * HZ;
3638
3639				spin_unlock(&ifp->lock);
3640
3641				if (deprecate) {
3642					in6_ifa_hold(ifp);
3643
3644					ipv6_ifa_notify(0, ifp);
3645					in6_ifa_put(ifp);
3646					goto restart;
3647				}
3648			} else if ((ifp->flags&IFA_F_TEMPORARY) &&
3649				   !(ifp->flags&IFA_F_TENTATIVE)) {
3650				unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3651					ifp->idev->cnf.dad_transmits *
3652					NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
3653
3654				if (age >= ifp->prefered_lft - regen_advance) {
3655					struct inet6_ifaddr *ifpub = ifp->ifpub;
3656					if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3657						next = ifp->tstamp + ifp->prefered_lft * HZ;
3658					if (!ifp->regen_count && ifpub) {
3659						ifp->regen_count++;
3660						in6_ifa_hold(ifp);
3661						in6_ifa_hold(ifpub);
3662						spin_unlock(&ifp->lock);
3663
3664						spin_lock(&ifpub->lock);
3665						ifpub->regen_count = 0;
3666						spin_unlock(&ifpub->lock);
3667						ipv6_create_tempaddr(ifpub, ifp);
 
3668						in6_ifa_put(ifpub);
3669						in6_ifa_put(ifp);
 
3670						goto restart;
3671					}
3672				} else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3673					next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3674				spin_unlock(&ifp->lock);
3675			} else {
3676				/* ifp->prefered_lft <= ifp->valid_lft */
3677				if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3678					next = ifp->tstamp + ifp->prefered_lft * HZ;
3679				spin_unlock(&ifp->lock);
3680			}
3681		}
3682	}
3683
3684	next_sec = round_jiffies_up(next);
3685	next_sched = next;
3686
3687	/* If rounded timeout is accurate enough, accept it. */
3688	if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3689		next_sched = next_sec;
3690
3691	/* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3692	if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3693		next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3694
3695	ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3696	      now, next, next_sec, next_sched);
3697	mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
3698	rcu_read_unlock_bh();
3699}
3700
3701static void addrconf_verify_work(struct work_struct *w)
3702{
3703	rtnl_lock();
3704	addrconf_verify_rtnl();
3705	rtnl_unlock();
3706}
3707
3708static void addrconf_verify(void)
3709{
3710	mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
3711}
3712
3713static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
3714				     struct in6_addr **peer_pfx)
3715{
3716	struct in6_addr *pfx = NULL;
3717
3718	*peer_pfx = NULL;
3719
3720	if (addr)
3721		pfx = nla_data(addr);
3722
3723	if (local) {
3724		if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3725			*peer_pfx = pfx;
3726		pfx = nla_data(local);
3727	}
3728
3729	return pfx;
3730}
3731
3732static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3733	[IFA_ADDRESS]		= { .len = sizeof(struct in6_addr) },
3734	[IFA_LOCAL]		= { .len = sizeof(struct in6_addr) },
3735	[IFA_CACHEINFO]		= { .len = sizeof(struct ifa_cacheinfo) },
3736	[IFA_FLAGS]		= { .len = sizeof(u32) },
3737};
3738
3739static int
3740inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
 
3741{
3742	struct net *net = sock_net(skb->sk);
3743	struct ifaddrmsg *ifm;
3744	struct nlattr *tb[IFA_MAX+1];
3745	struct in6_addr *pfx, *peer_pfx;
 
3746	int err;
3747
3748	err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
 
3749	if (err < 0)
3750		return err;
3751
3752	ifm = nlmsg_data(nlh);
3753	pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
3754	if (pfx == NULL)
3755		return -EINVAL;
3756
3757	return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
 
 
 
 
 
 
3758}
3759
3760static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
3761			     u32 prefered_lft, u32 valid_lft)
3762{
3763	u32 flags;
3764	clock_t expires;
3765	unsigned long timeout;
3766	bool was_managetempaddr;
3767	bool had_prefixroute;
3768
3769	ASSERT_RTNL();
3770
3771	if (!valid_lft || (prefered_lft > valid_lft))
3772		return -EINVAL;
3773
3774	if (ifa_flags & IFA_F_MANAGETEMPADDR &&
3775	    (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
3776		return -EINVAL;
3777
 
 
 
3778	timeout = addrconf_timeout_fixup(valid_lft, HZ);
3779	if (addrconf_finite_timeout(timeout)) {
3780		expires = jiffies_to_clock_t(timeout * HZ);
3781		valid_lft = timeout;
3782		flags = RTF_EXPIRES;
3783	} else {
3784		expires = 0;
3785		flags = 0;
3786		ifa_flags |= IFA_F_PERMANENT;
3787	}
3788
3789	timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3790	if (addrconf_finite_timeout(timeout)) {
3791		if (timeout == 0)
3792			ifa_flags |= IFA_F_DEPRECATED;
3793		prefered_lft = timeout;
3794	}
3795
3796	spin_lock_bh(&ifp->lock);
3797	was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
3798	had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
3799			  !(ifp->flags & IFA_F_NOPREFIXROUTE);
3800	ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
3801			IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
3802			IFA_F_NOPREFIXROUTE);
3803	ifp->flags |= ifa_flags;
3804	ifp->tstamp = jiffies;
3805	ifp->valid_lft = valid_lft;
3806	ifp->prefered_lft = prefered_lft;
3807
3808	spin_unlock_bh(&ifp->lock);
3809	if (!(ifp->flags&IFA_F_TENTATIVE))
3810		ipv6_ifa_notify(0, ifp);
3811
3812	if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
3813		addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3814				      expires, flags);
3815	} else if (had_prefixroute) {
3816		enum cleanup_prefix_rt_t action;
3817		unsigned long rt_expires;
3818
3819		write_lock_bh(&ifp->idev->lock);
3820		action = check_cleanup_prefix_route(ifp, &rt_expires);
3821		write_unlock_bh(&ifp->idev->lock);
3822
3823		if (action != CLEANUP_PREFIX_RT_NOP) {
3824			cleanup_prefix_route(ifp, rt_expires,
3825				action == CLEANUP_PREFIX_RT_DEL);
3826		}
3827	}
3828
3829	if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
3830		if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
3831			valid_lft = prefered_lft = 0;
3832		manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
3833				 !was_managetempaddr, jiffies);
3834	}
3835
3836	addrconf_verify_rtnl();
3837
3838	return 0;
3839}
3840
3841static int
3842inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
 
3843{
3844	struct net *net = sock_net(skb->sk);
3845	struct ifaddrmsg *ifm;
3846	struct nlattr *tb[IFA_MAX+1];
3847	struct in6_addr *pfx, *peer_pfx;
3848	struct inet6_ifaddr *ifa;
3849	struct net_device *dev;
 
3850	u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3851	u32 ifa_flags;
3852	int err;
3853
3854	err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
 
3855	if (err < 0)
3856		return err;
3857
3858	ifm = nlmsg_data(nlh);
3859	pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
3860	if (pfx == NULL)
3861		return -EINVAL;
3862
3863	if (tb[IFA_CACHEINFO]) {
3864		struct ifa_cacheinfo *ci;
3865
3866		ci = nla_data(tb[IFA_CACHEINFO]);
3867		valid_lft = ci->ifa_valid;
3868		preferred_lft = ci->ifa_prefered;
3869	} else {
3870		preferred_lft = INFINITY_LIFE_TIME;
3871		valid_lft = INFINITY_LIFE_TIME;
3872	}
3873
3874	dev =  __dev_get_by_index(net, ifm->ifa_index);
3875	if (dev == NULL)
3876		return -ENODEV;
3877
3878	ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
3879
3880	/* We ignore other flags so far. */
3881	ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
3882		     IFA_F_NOPREFIXROUTE;
 
 
 
 
 
 
 
 
 
 
 
 
3883
3884	ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3885	if (ifa == NULL) {
3886		/*
3887		 * It would be best to check for !NLM_F_CREATE here but
3888		 * userspace already relies on not having to provide this.
3889		 */
3890		return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
3891				      ifm->ifa_prefixlen, ifa_flags,
3892				      preferred_lft, valid_lft);
3893	}
3894
3895	if (nlh->nlmsg_flags & NLM_F_EXCL ||
3896	    !(nlh->nlmsg_flags & NLM_F_REPLACE))
3897		err = -EEXIST;
3898	else
3899		err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3900
3901	in6_ifa_put(ifa);
3902
3903	return err;
3904}
3905
3906static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
3907			  u8 scope, int ifindex)
3908{
3909	struct ifaddrmsg *ifm;
3910
3911	ifm = nlmsg_data(nlh);
3912	ifm->ifa_family = AF_INET6;
3913	ifm->ifa_prefixlen = prefixlen;
3914	ifm->ifa_flags = flags;
3915	ifm->ifa_scope = scope;
3916	ifm->ifa_index = ifindex;
3917}
3918
3919static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3920			 unsigned long tstamp, u32 preferred, u32 valid)
3921{
3922	struct ifa_cacheinfo ci;
3923
3924	ci.cstamp = cstamp_delta(cstamp);
3925	ci.tstamp = cstamp_delta(tstamp);
3926	ci.ifa_prefered = preferred;
3927	ci.ifa_valid = valid;
3928
3929	return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3930}
3931
3932static inline int rt_scope(int ifa_scope)
3933{
3934	if (ifa_scope & IFA_HOST)
3935		return RT_SCOPE_HOST;
3936	else if (ifa_scope & IFA_LINK)
3937		return RT_SCOPE_LINK;
3938	else if (ifa_scope & IFA_SITE)
3939		return RT_SCOPE_SITE;
3940	else
3941		return RT_SCOPE_UNIVERSE;
3942}
3943
3944static inline int inet6_ifaddr_msgsize(void)
3945{
3946	return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3947	       + nla_total_size(16) /* IFA_LOCAL */
3948	       + nla_total_size(16) /* IFA_ADDRESS */
3949	       + nla_total_size(sizeof(struct ifa_cacheinfo))
3950	       + nla_total_size(4)  /* IFA_FLAGS */;
3951}
3952
3953static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3954			     u32 portid, u32 seq, int event, unsigned int flags)
3955{
3956	struct nlmsghdr  *nlh;
3957	u32 preferred, valid;
3958
3959	nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3960	if (nlh == NULL)
3961		return -EMSGSIZE;
3962
3963	put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3964		      ifa->idev->dev->ifindex);
3965
3966	if (!((ifa->flags&IFA_F_PERMANENT) &&
3967	      (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
3968		preferred = ifa->prefered_lft;
3969		valid = ifa->valid_lft;
3970		if (preferred != INFINITY_LIFE_TIME) {
3971			long tval = (jiffies - ifa->tstamp)/HZ;
3972			if (preferred > tval)
3973				preferred -= tval;
3974			else
3975				preferred = 0;
3976			if (valid != INFINITY_LIFE_TIME) {
3977				if (valid > tval)
3978					valid -= tval;
3979				else
3980					valid = 0;
3981			}
3982		}
3983	} else {
3984		preferred = INFINITY_LIFE_TIME;
3985		valid = INFINITY_LIFE_TIME;
3986	}
3987
3988	if (!ipv6_addr_any(&ifa->peer_addr)) {
3989		if (nla_put(skb, IFA_LOCAL, 16, &ifa->addr) < 0 ||
3990		    nla_put(skb, IFA_ADDRESS, 16, &ifa->peer_addr) < 0)
3991			goto error;
3992	} else
3993		if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0)
3994			goto error;
3995
3996	if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
3997		goto error;
3998
3999	if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4000		goto error;
4001
4002	return nlmsg_end(skb, nlh);
 
4003
4004error:
4005	nlmsg_cancel(skb, nlh);
4006	return -EMSGSIZE;
4007}
4008
4009static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
4010				u32 portid, u32 seq, int event, u16 flags)
4011{
4012	struct nlmsghdr  *nlh;
4013	u8 scope = RT_SCOPE_UNIVERSE;
4014	int ifindex = ifmca->idev->dev->ifindex;
4015
4016	if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4017		scope = RT_SCOPE_SITE;
4018
4019	nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4020	if (nlh == NULL)
4021		return -EMSGSIZE;
4022
4023	put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4024	if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
4025	    put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
4026			  INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4027		nlmsg_cancel(skb, nlh);
4028		return -EMSGSIZE;
4029	}
4030
4031	return nlmsg_end(skb, nlh);
 
4032}
4033
4034static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
4035				u32 portid, u32 seq, int event, unsigned int flags)
4036{
4037	struct nlmsghdr  *nlh;
4038	u8 scope = RT_SCOPE_UNIVERSE;
4039	int ifindex = ifaca->aca_idev->dev->ifindex;
4040
4041	if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4042		scope = RT_SCOPE_SITE;
4043
4044	nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4045	if (nlh == NULL)
4046		return -EMSGSIZE;
4047
4048	put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4049	if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
4050	    put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
4051			  INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4052		nlmsg_cancel(skb, nlh);
4053		return -EMSGSIZE;
4054	}
4055
4056	return nlmsg_end(skb, nlh);
 
4057}
4058
4059enum addr_type_t {
4060	UNICAST_ADDR,
4061	MULTICAST_ADDR,
4062	ANYCAST_ADDR,
4063};
4064
4065/* called with rcu_read_lock() */
4066static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4067			  struct netlink_callback *cb, enum addr_type_t type,
4068			  int s_ip_idx, int *p_ip_idx)
4069{
4070	struct ifmcaddr6 *ifmca;
4071	struct ifacaddr6 *ifaca;
4072	int err = 1;
4073	int ip_idx = *p_ip_idx;
4074
4075	read_lock_bh(&idev->lock);
4076	switch (type) {
4077	case UNICAST_ADDR: {
4078		struct inet6_ifaddr *ifa;
4079
4080		/* unicast address incl. temp addr */
4081		list_for_each_entry(ifa, &idev->addr_list, if_list) {
4082			if (++ip_idx < s_ip_idx)
4083				continue;
4084			err = inet6_fill_ifaddr(skb, ifa,
4085						NETLINK_CB(cb->skb).portid,
4086						cb->nlh->nlmsg_seq,
4087						RTM_NEWADDR,
4088						NLM_F_MULTI);
4089			if (err <= 0)
4090				break;
4091			nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4092		}
4093		break;
4094	}
4095	case MULTICAST_ADDR:
4096		/* multicast address */
4097		for (ifmca = idev->mc_list; ifmca;
4098		     ifmca = ifmca->next, ip_idx++) {
4099			if (ip_idx < s_ip_idx)
4100				continue;
4101			err = inet6_fill_ifmcaddr(skb, ifmca,
4102						  NETLINK_CB(cb->skb).portid,
4103						  cb->nlh->nlmsg_seq,
4104						  RTM_GETMULTICAST,
4105						  NLM_F_MULTI);
4106			if (err <= 0)
4107				break;
4108		}
4109		break;
4110	case ANYCAST_ADDR:
4111		/* anycast address */
4112		for (ifaca = idev->ac_list; ifaca;
4113		     ifaca = ifaca->aca_next, ip_idx++) {
4114			if (ip_idx < s_ip_idx)
4115				continue;
4116			err = inet6_fill_ifacaddr(skb, ifaca,
4117						  NETLINK_CB(cb->skb).portid,
4118						  cb->nlh->nlmsg_seq,
4119						  RTM_GETANYCAST,
4120						  NLM_F_MULTI);
4121			if (err <= 0)
4122				break;
4123		}
4124		break;
4125	default:
4126		break;
4127	}
4128	read_unlock_bh(&idev->lock);
4129	*p_ip_idx = ip_idx;
4130	return err;
4131}
4132
4133static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4134			   enum addr_type_t type)
4135{
4136	struct net *net = sock_net(skb->sk);
4137	int h, s_h;
4138	int idx, ip_idx;
4139	int s_idx, s_ip_idx;
4140	struct net_device *dev;
4141	struct inet6_dev *idev;
4142	struct hlist_head *head;
4143
4144	s_h = cb->args[0];
4145	s_idx = idx = cb->args[1];
4146	s_ip_idx = ip_idx = cb->args[2];
4147
4148	rcu_read_lock();
4149	cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
4150	for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4151		idx = 0;
4152		head = &net->dev_index_head[h];
4153		hlist_for_each_entry_rcu(dev, head, index_hlist) {
4154			if (idx < s_idx)
4155				goto cont;
4156			if (h > s_h || idx > s_idx)
4157				s_ip_idx = 0;
4158			ip_idx = 0;
4159			idev = __in6_dev_get(dev);
4160			if (!idev)
4161				goto cont;
4162
4163			if (in6_dump_addrs(idev, skb, cb, type,
4164					   s_ip_idx, &ip_idx) <= 0)
4165				goto done;
4166cont:
4167			idx++;
4168		}
4169	}
4170done:
4171	rcu_read_unlock();
4172	cb->args[0] = h;
4173	cb->args[1] = idx;
4174	cb->args[2] = ip_idx;
4175
4176	return skb->len;
4177}
4178
4179static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4180{
4181	enum addr_type_t type = UNICAST_ADDR;
4182
4183	return inet6_dump_addr(skb, cb, type);
4184}
4185
4186static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4187{
4188	enum addr_type_t type = MULTICAST_ADDR;
4189
4190	return inet6_dump_addr(skb, cb, type);
4191}
4192
4193
4194static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4195{
4196	enum addr_type_t type = ANYCAST_ADDR;
4197
4198	return inet6_dump_addr(skb, cb, type);
4199}
4200
4201static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
 
4202{
4203	struct net *net = sock_net(in_skb->sk);
4204	struct ifaddrmsg *ifm;
4205	struct nlattr *tb[IFA_MAX+1];
4206	struct in6_addr *addr = NULL, *peer;
4207	struct net_device *dev = NULL;
4208	struct inet6_ifaddr *ifa;
4209	struct sk_buff *skb;
4210	int err;
4211
4212	err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
 
4213	if (err < 0)
4214		goto errout;
4215
4216	addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
4217	if (addr == NULL) {
4218		err = -EINVAL;
4219		goto errout;
4220	}
4221
4222	ifm = nlmsg_data(nlh);
4223	if (ifm->ifa_index)
4224		dev = __dev_get_by_index(net, ifm->ifa_index);
4225
4226	ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4227	if (!ifa) {
4228		err = -EADDRNOTAVAIL;
4229		goto errout;
4230	}
4231
4232	skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4233	if (!skb) {
4234		err = -ENOBUFS;
4235		goto errout_ifa;
4236	}
4237
4238	err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
4239				nlh->nlmsg_seq, RTM_NEWADDR, 0);
4240	if (err < 0) {
4241		/* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4242		WARN_ON(err == -EMSGSIZE);
4243		kfree_skb(skb);
4244		goto errout_ifa;
4245	}
4246	err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
4247errout_ifa:
4248	in6_ifa_put(ifa);
4249errout:
 
 
4250	return err;
4251}
4252
4253static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4254{
4255	struct sk_buff *skb;
4256	struct net *net = dev_net(ifa->idev->dev);
4257	int err = -ENOBUFS;
4258
 
 
 
 
 
 
 
 
4259	skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
4260	if (skb == NULL)
4261		goto errout;
4262
4263	err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
4264	if (err < 0) {
4265		/* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4266		WARN_ON(err == -EMSGSIZE);
4267		kfree_skb(skb);
4268		goto errout;
4269	}
4270	rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4271	return;
4272errout:
4273	if (err < 0)
4274		rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
4275}
4276
4277static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
4278				__s32 *array, int bytes)
4279{
4280	BUG_ON(bytes < (DEVCONF_MAX * 4));
4281
4282	memset(array, 0, bytes);
4283	array[DEVCONF_FORWARDING] = cnf->forwarding;
4284	array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4285	array[DEVCONF_MTU6] = cnf->mtu6;
4286	array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4287	array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4288	array[DEVCONF_AUTOCONF] = cnf->autoconf;
4289	array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4290	array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
4291	array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4292		jiffies_to_msecs(cnf->rtr_solicit_interval);
 
 
4293	array[DEVCONF_RTR_SOLICIT_DELAY] =
4294		jiffies_to_msecs(cnf->rtr_solicit_delay);
4295	array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
4296	array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
4297		jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
4298	array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
4299		jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
4300	array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4301	array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4302	array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4303	array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4304	array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
4305	array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
4306	array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
 
4307	array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
4308#ifdef CONFIG_IPV6_ROUTER_PREF
4309	array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
4310	array[DEVCONF_RTR_PROBE_INTERVAL] =
4311		jiffies_to_msecs(cnf->rtr_probe_interval);
4312#ifdef CONFIG_IPV6_ROUTE_INFO
 
4313	array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4314#endif
4315#endif
4316	array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
4317	array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
4318#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4319	array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
 
4320#endif
4321#ifdef CONFIG_IPV6_MROUTE
4322	array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4323#endif
4324	array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
4325	array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
4326	array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
4327	array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
4328	array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
4329}
4330
4331static inline size_t inet6_ifla6_size(void)
4332{
4333	return nla_total_size(4) /* IFLA_INET6_FLAGS */
4334	     + nla_total_size(sizeof(struct ifla_cacheinfo))
4335	     + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4336	     + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
4337	     + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4338	     + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
4339}
4340
4341static inline size_t inet6_if_nlmsg_size(void)
4342{
4343	return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4344	       + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4345	       + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4346	       + nla_total_size(4) /* IFLA_MTU */
4347	       + nla_total_size(4) /* IFLA_LINK */
 
4348	       + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
4349}
4350
4351static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
4352				      int items, int bytes)
4353{
4354	int i;
4355	int pad = bytes - sizeof(u64) * items;
4356	BUG_ON(pad < 0);
4357
4358	/* Use put_unaligned() because stats may not be aligned for u64. */
4359	put_unaligned(items, &stats[0]);
4360	for (i = 1; i < items; i++)
4361		put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
4362
4363	memset(&stats[items], 0, pad);
4364}
4365
4366static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib,
4367				      int items, int bytes, size_t syncpoff)
4368{
4369	int i;
4370	int pad = bytes - sizeof(u64) * items;
 
 
4371	BUG_ON(pad < 0);
4372
4373	/* Use put_unaligned() because stats may not be aligned for u64. */
4374	put_unaligned(items, &stats[0]);
4375	for (i = 1; i < items; i++)
4376		put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
 
 
 
4377
4378	memset(&stats[items], 0, pad);
 
4379}
4380
4381static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4382			     int bytes)
4383{
4384	switch (attrtype) {
4385	case IFLA_INET6_STATS:
4386		__snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6,
4387				     IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
4388		break;
4389	case IFLA_INET6_ICMP6STATS:
4390		__snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
4391		break;
4392	}
4393}
4394
4395static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
 
4396{
4397	struct nlattr *nla;
4398	struct ifla_cacheinfo ci;
4399
4400	if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4401		goto nla_put_failure;
4402	ci.max_reasm_len = IPV6_MAXPLEN;
4403	ci.tstamp = cstamp_delta(idev->tstamp);
4404	ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
4405	ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
4406	if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4407		goto nla_put_failure;
4408	nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
4409	if (nla == NULL)
4410		goto nla_put_failure;
4411	ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4412
4413	/* XXX - MC not implemented */
4414
 
 
 
4415	nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4416	if (nla == NULL)
4417		goto nla_put_failure;
4418	snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4419
4420	nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4421	if (nla == NULL)
4422		goto nla_put_failure;
4423	snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4424
4425	nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
4426	if (nla == NULL)
 
 
 
4427		goto nla_put_failure;
 
4428	read_lock_bh(&idev->lock);
4429	memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
4430	read_unlock_bh(&idev->lock);
4431
4432	return 0;
4433
4434nla_put_failure:
4435	return -EMSGSIZE;
4436}
4437
4438static size_t inet6_get_link_af_size(const struct net_device *dev)
 
4439{
4440	if (!__in6_dev_get(dev))
4441		return 0;
4442
4443	return inet6_ifla6_size();
4444}
4445
4446static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
 
4447{
4448	struct inet6_dev *idev = __in6_dev_get(dev);
4449
4450	if (!idev)
4451		return -ENODATA;
4452
4453	if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4454		return -EMSGSIZE;
4455
4456	return 0;
4457}
4458
4459static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
4460{
4461	struct inet6_ifaddr *ifp;
4462	struct net_device *dev = idev->dev;
4463	bool update_rs = false;
4464	struct in6_addr ll_addr;
4465
4466	ASSERT_RTNL();
4467
4468	if (token == NULL)
4469		return -EINVAL;
4470	if (ipv6_addr_any(token))
4471		return -EINVAL;
4472	if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
4473		return -EINVAL;
4474	if (!ipv6_accept_ra(idev))
4475		return -EINVAL;
4476	if (idev->cnf.rtr_solicits <= 0)
4477		return -EINVAL;
4478
4479	write_lock_bh(&idev->lock);
4480
4481	BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
4482	memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
4483
4484	write_unlock_bh(&idev->lock);
4485
 
 
 
 
4486	if (!idev->dead && (idev->if_flags & IF_READY) &&
4487	    !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
4488			     IFA_F_OPTIMISTIC)) {
4489
4490		/* If we're not ready, then normal ifup will take care
4491		 * of this. Otherwise, we need to request our rs here.
4492		 */
4493		ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
4494		update_rs = true;
4495	}
4496
 
4497	write_lock_bh(&idev->lock);
4498
4499	if (update_rs) {
4500		idev->if_flags |= IF_RS_SENT;
 
 
4501		idev->rs_probes = 1;
4502		addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval);
4503	}
4504
4505	/* Well, that's kinda nasty ... */
4506	list_for_each_entry(ifp, &idev->addr_list, if_list) {
4507		spin_lock(&ifp->lock);
4508		if (ifp->tokenized) {
4509			ifp->valid_lft = 0;
4510			ifp->prefered_lft = 0;
4511		}
4512		spin_unlock(&ifp->lock);
4513	}
4514
4515	write_unlock_bh(&idev->lock);
 
4516	addrconf_verify_rtnl();
4517	return 0;
4518}
4519
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
4520static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
4521{
4522	int err = -EINVAL;
4523	struct inet6_dev *idev = __in6_dev_get(dev);
4524	struct nlattr *tb[IFLA_INET6_MAX + 1];
4525
4526	if (!idev)
4527		return -EAFNOSUPPORT;
4528
4529	if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
4530		BUG();
4531
4532	if (tb[IFLA_INET6_TOKEN])
4533		err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
 
 
 
 
 
 
 
 
 
 
 
 
 
 
4534
4535	return err;
4536}
4537
4538static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
4539			     u32 portid, u32 seq, int event, unsigned int flags)
4540{
4541	struct net_device *dev = idev->dev;
4542	struct ifinfomsg *hdr;
4543	struct nlmsghdr *nlh;
4544	void *protoinfo;
4545
4546	nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
4547	if (nlh == NULL)
4548		return -EMSGSIZE;
4549
4550	hdr = nlmsg_data(nlh);
4551	hdr->ifi_family = AF_INET6;
4552	hdr->__ifi_pad = 0;
4553	hdr->ifi_type = dev->type;
4554	hdr->ifi_index = dev->ifindex;
4555	hdr->ifi_flags = dev_get_flags(dev);
4556	hdr->ifi_change = 0;
4557
4558	if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4559	    (dev->addr_len &&
4560	     nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4561	    nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4562	    (dev->ifindex != dev->iflink &&
4563	     nla_put_u32(skb, IFLA_LINK, dev->iflink)))
 
 
4564		goto nla_put_failure;
4565	protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4566	if (protoinfo == NULL)
4567		goto nla_put_failure;
4568
4569	if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4570		goto nla_put_failure;
4571
4572	nla_nest_end(skb, protoinfo);
4573	return nlmsg_end(skb, nlh);
 
4574
4575nla_put_failure:
4576	nlmsg_cancel(skb, nlh);
4577	return -EMSGSIZE;
4578}
4579
4580static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4581{
4582	struct net *net = sock_net(skb->sk);
4583	int h, s_h;
4584	int idx = 0, s_idx;
4585	struct net_device *dev;
4586	struct inet6_dev *idev;
4587	struct hlist_head *head;
4588
4589	s_h = cb->args[0];
4590	s_idx = cb->args[1];
4591
4592	rcu_read_lock();
4593	for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4594		idx = 0;
4595		head = &net->dev_index_head[h];
4596		hlist_for_each_entry_rcu(dev, head, index_hlist) {
4597			if (idx < s_idx)
4598				goto cont;
4599			idev = __in6_dev_get(dev);
4600			if (!idev)
4601				goto cont;
4602			if (inet6_fill_ifinfo(skb, idev,
4603					      NETLINK_CB(cb->skb).portid,
4604					      cb->nlh->nlmsg_seq,
4605					      RTM_NEWLINK, NLM_F_MULTI) <= 0)
4606				goto out;
4607cont:
4608			idx++;
4609		}
4610	}
4611out:
4612	rcu_read_unlock();
4613	cb->args[1] = idx;
4614	cb->args[0] = h;
4615
4616	return skb->len;
4617}
4618
4619void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4620{
4621	struct sk_buff *skb;
4622	struct net *net = dev_net(idev->dev);
4623	int err = -ENOBUFS;
4624
4625	skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
4626	if (skb == NULL)
4627		goto errout;
4628
4629	err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
4630	if (err < 0) {
4631		/* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4632		WARN_ON(err == -EMSGSIZE);
4633		kfree_skb(skb);
4634		goto errout;
4635	}
4636	rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
4637	return;
4638errout:
4639	if (err < 0)
4640		rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
4641}
4642
4643static inline size_t inet6_prefix_nlmsg_size(void)
4644{
4645	return NLMSG_ALIGN(sizeof(struct prefixmsg))
4646	       + nla_total_size(sizeof(struct in6_addr))
4647	       + nla_total_size(sizeof(struct prefix_cacheinfo));
4648}
4649
4650static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
4651			     struct prefix_info *pinfo, u32 portid, u32 seq,
4652			     int event, unsigned int flags)
4653{
4654	struct prefixmsg *pmsg;
4655	struct nlmsghdr *nlh;
4656	struct prefix_cacheinfo	ci;
4657
4658	nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
4659	if (nlh == NULL)
4660		return -EMSGSIZE;
4661
4662	pmsg = nlmsg_data(nlh);
4663	pmsg->prefix_family = AF_INET6;
4664	pmsg->prefix_pad1 = 0;
4665	pmsg->prefix_pad2 = 0;
4666	pmsg->prefix_ifindex = idev->dev->ifindex;
4667	pmsg->prefix_len = pinfo->prefix_len;
4668	pmsg->prefix_type = pinfo->type;
4669	pmsg->prefix_pad3 = 0;
4670	pmsg->prefix_flags = 0;
4671	if (pinfo->onlink)
4672		pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4673	if (pinfo->autoconf)
4674		pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4675
4676	if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
4677		goto nla_put_failure;
4678	ci.preferred_time = ntohl(pinfo->prefered);
4679	ci.valid_time = ntohl(pinfo->valid);
4680	if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
4681		goto nla_put_failure;
4682	return nlmsg_end(skb, nlh);
 
4683
4684nla_put_failure:
4685	nlmsg_cancel(skb, nlh);
4686	return -EMSGSIZE;
4687}
4688
4689static void inet6_prefix_notify(int event, struct inet6_dev *idev,
4690			 struct prefix_info *pinfo)
4691{
4692	struct sk_buff *skb;
4693	struct net *net = dev_net(idev->dev);
4694	int err = -ENOBUFS;
4695
4696	skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
4697	if (skb == NULL)
4698		goto errout;
4699
4700	err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
4701	if (err < 0) {
4702		/* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4703		WARN_ON(err == -EMSGSIZE);
4704		kfree_skb(skb);
4705		goto errout;
4706	}
4707	rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4708	return;
4709errout:
4710	if (err < 0)
4711		rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
4712}
4713
4714static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4715{
4716	struct net *net = dev_net(ifp->idev->dev);
4717
4718	if (event)
4719		ASSERT_RTNL();
4720
4721	inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4722
4723	switch (event) {
4724	case RTM_NEWADDR:
4725		/*
4726		 * If the address was optimistic
4727		 * we inserted the route at the start of
4728		 * our DAD process, so we don't need
4729		 * to do it again
4730		 */
4731		if (!(ifp->rt->rt6i_node))
4732			ip6_ins_rt(ifp->rt);
4733		if (ifp->idev->cnf.forwarding)
4734			addrconf_join_anycast(ifp);
4735		if (!ipv6_addr_any(&ifp->peer_addr))
4736			addrconf_prefix_route(&ifp->peer_addr, 128,
4737					      ifp->idev->dev, 0, 0);
4738		break;
4739	case RTM_DELADDR:
4740		if (ifp->idev->cnf.forwarding)
4741			addrconf_leave_anycast(ifp);
4742		addrconf_leave_solict(ifp->idev, &ifp->addr);
4743		if (!ipv6_addr_any(&ifp->peer_addr)) {
4744			struct rt6_info *rt;
4745			struct net_device *dev = ifp->idev->dev;
4746
4747			rt = rt6_lookup(dev_net(dev), &ifp->peer_addr, NULL,
4748					dev->ifindex, 1);
4749			if (rt) {
4750				dst_hold(&rt->dst);
4751				if (ip6_del_rt(rt))
4752					dst_free(&rt->dst);
4753			}
4754		}
4755		dst_hold(&ifp->rt->dst);
4756
4757		if (ip6_del_rt(ifp->rt))
4758			dst_free(&ifp->rt->dst);
 
4759		break;
4760	}
4761	atomic_inc(&net->ipv6.dev_addr_genid);
4762	rt_genid_bump_ipv6(net);
4763}
4764
4765static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4766{
4767	rcu_read_lock_bh();
4768	if (likely(ifp->idev->dead == 0))
4769		__ipv6_ifa_notify(event, ifp);
4770	rcu_read_unlock_bh();
4771}
4772
4773#ifdef CONFIG_SYSCTL
4774
4775static
4776int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
4777			   void __user *buffer, size_t *lenp, loff_t *ppos)
4778{
4779	int *valp = ctl->data;
4780	int val = *valp;
4781	loff_t pos = *ppos;
4782	struct ctl_table lctl;
4783	int ret;
4784
4785	/*
4786	 * ctl->data points to idev->cnf.forwarding, we should
4787	 * not modify it until we get the rtnl lock.
4788	 */
4789	lctl = *ctl;
4790	lctl.data = &val;
4791
4792	ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4793
4794	if (write)
4795		ret = addrconf_fixup_forwarding(ctl, valp, val);
4796	if (ret)
4797		*ppos = pos;
4798	return ret;
4799}
4800
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
4801static void dev_disable_change(struct inet6_dev *idev)
4802{
4803	struct netdev_notifier_info info;
4804
4805	if (!idev || !idev->dev)
4806		return;
4807
4808	netdev_notifier_info_init(&info, idev->dev);
4809	if (idev->cnf.disable_ipv6)
4810		addrconf_notify(NULL, NETDEV_DOWN, &info);
4811	else
4812		addrconf_notify(NULL, NETDEV_UP, &info);
4813}
4814
4815static void addrconf_disable_change(struct net *net, __s32 newf)
4816{
4817	struct net_device *dev;
4818	struct inet6_dev *idev;
4819
4820	rcu_read_lock();
4821	for_each_netdev_rcu(net, dev) {
4822		idev = __in6_dev_get(dev);
4823		if (idev) {
4824			int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4825			idev->cnf.disable_ipv6 = newf;
4826			if (changed)
4827				dev_disable_change(idev);
4828		}
4829	}
4830	rcu_read_unlock();
4831}
4832
4833static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
4834{
4835	struct net *net;
4836	int old;
4837
4838	if (!rtnl_trylock())
4839		return restart_syscall();
4840
4841	net = (struct net *)table->extra2;
4842	old = *p;
4843	*p = newf;
4844
4845	if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
4846		rtnl_unlock();
4847		return 0;
4848	}
4849
4850	if (p == &net->ipv6.devconf_all->disable_ipv6) {
4851		net->ipv6.devconf_dflt->disable_ipv6 = newf;
4852		addrconf_disable_change(net, newf);
4853	} else if ((!newf) ^ (!old))
4854		dev_disable_change((struct inet6_dev *)table->extra1);
4855
4856	rtnl_unlock();
4857	return 0;
4858}
4859
4860static
4861int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
4862			    void __user *buffer, size_t *lenp, loff_t *ppos)
4863{
4864	int *valp = ctl->data;
4865	int val = *valp;
4866	loff_t pos = *ppos;
4867	struct ctl_table lctl;
4868	int ret;
4869
4870	/*
4871	 * ctl->data points to idev->cnf.disable_ipv6, we should
4872	 * not modify it until we get the rtnl lock.
4873	 */
4874	lctl = *ctl;
4875	lctl.data = &val;
4876
4877	ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4878
4879	if (write)
4880		ret = addrconf_disable_ipv6(ctl, valp, val);
4881	if (ret)
4882		*ppos = pos;
4883	return ret;
4884}
4885
4886static
4887int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
4888			      void __user *buffer, size_t *lenp, loff_t *ppos)
4889{
4890	int *valp = ctl->data;
4891	int ret;
4892	int old, new;
4893
4894	old = *valp;
4895	ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
4896	new = *valp;
4897
4898	if (write && old != new) {
4899		struct net *net = ctl->extra2;
4900
4901		if (!rtnl_trylock())
4902			return restart_syscall();
4903
4904		if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
4905			inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
 
4906						     NETCONFA_IFINDEX_DEFAULT,
4907						     net->ipv6.devconf_dflt);
4908		else if (valp == &net->ipv6.devconf_all->proxy_ndp)
4909			inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
 
4910						     NETCONFA_IFINDEX_ALL,
4911						     net->ipv6.devconf_all);
4912		else {
4913			struct inet6_dev *idev = ctl->extra1;
4914
4915			inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
 
4916						     idev->dev->ifindex,
4917						     &idev->cnf);
4918		}
4919		rtnl_unlock();
4920	}
4921
4922	return ret;
4923}
4924
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
4925
4926static struct addrconf_sysctl_table
 
 
4927{
4928	struct ctl_table_header *sysctl_header;
4929	struct ctl_table addrconf_vars[DEVCONF_MAX+1];
4930} addrconf_sysctl __read_mostly = {
4931	.sysctl_header = NULL,
4932	.addrconf_vars = {
4933		{
4934			.procname	= "forwarding",
4935			.data		= &ipv6_devconf.forwarding,
4936			.maxlen		= sizeof(int),
4937			.mode		= 0644,
4938			.proc_handler	= addrconf_sysctl_forward,
4939		},
4940		{
4941			.procname	= "hop_limit",
4942			.data		= &ipv6_devconf.hop_limit,
4943			.maxlen		= sizeof(int),
4944			.mode		= 0644,
4945			.proc_handler	= proc_dointvec,
4946		},
4947		{
4948			.procname	= "mtu",
4949			.data		= &ipv6_devconf.mtu6,
4950			.maxlen		= sizeof(int),
4951			.mode		= 0644,
4952			.proc_handler	= proc_dointvec,
4953		},
4954		{
4955			.procname	= "accept_ra",
4956			.data		= &ipv6_devconf.accept_ra,
4957			.maxlen		= sizeof(int),
4958			.mode		= 0644,
4959			.proc_handler	= proc_dointvec,
4960		},
4961		{
4962			.procname	= "accept_redirects",
4963			.data		= &ipv6_devconf.accept_redirects,
4964			.maxlen		= sizeof(int),
4965			.mode		= 0644,
4966			.proc_handler	= proc_dointvec,
4967		},
4968		{
4969			.procname	= "autoconf",
4970			.data		= &ipv6_devconf.autoconf,
4971			.maxlen		= sizeof(int),
4972			.mode		= 0644,
4973			.proc_handler	= proc_dointvec,
4974		},
4975		{
4976			.procname	= "dad_transmits",
4977			.data		= &ipv6_devconf.dad_transmits,
4978			.maxlen		= sizeof(int),
4979			.mode		= 0644,
4980			.proc_handler	= proc_dointvec,
4981		},
4982		{
4983			.procname	= "router_solicitations",
4984			.data		= &ipv6_devconf.rtr_solicits,
4985			.maxlen		= sizeof(int),
4986			.mode		= 0644,
4987			.proc_handler	= proc_dointvec,
4988		},
4989		{
4990			.procname	= "router_solicitation_interval",
4991			.data		= &ipv6_devconf.rtr_solicit_interval,
4992			.maxlen		= sizeof(int),
4993			.mode		= 0644,
4994			.proc_handler	= proc_dointvec_jiffies,
4995		},
4996		{
4997			.procname	= "router_solicitation_delay",
4998			.data		= &ipv6_devconf.rtr_solicit_delay,
4999			.maxlen		= sizeof(int),
5000			.mode		= 0644,
5001			.proc_handler	= proc_dointvec_jiffies,
5002		},
5003		{
5004			.procname	= "force_mld_version",
5005			.data		= &ipv6_devconf.force_mld_version,
5006			.maxlen		= sizeof(int),
5007			.mode		= 0644,
5008			.proc_handler	= proc_dointvec,
5009		},
5010		{
5011			.procname	= "mldv1_unsolicited_report_interval",
5012			.data		=
5013				&ipv6_devconf.mldv1_unsolicited_report_interval,
5014			.maxlen		= sizeof(int),
5015			.mode		= 0644,
5016			.proc_handler	= proc_dointvec_ms_jiffies,
5017		},
5018		{
5019			.procname	= "mldv2_unsolicited_report_interval",
5020			.data		=
5021				&ipv6_devconf.mldv2_unsolicited_report_interval,
5022			.maxlen		= sizeof(int),
5023			.mode		= 0644,
5024			.proc_handler	= proc_dointvec_ms_jiffies,
5025		},
5026		{
5027			.procname	= "use_tempaddr",
5028			.data		= &ipv6_devconf.use_tempaddr,
5029			.maxlen		= sizeof(int),
5030			.mode		= 0644,
5031			.proc_handler	= proc_dointvec,
5032		},
5033		{
5034			.procname	= "temp_valid_lft",
5035			.data		= &ipv6_devconf.temp_valid_lft,
5036			.maxlen		= sizeof(int),
5037			.mode		= 0644,
5038			.proc_handler	= proc_dointvec,
5039		},
5040		{
5041			.procname	= "temp_prefered_lft",
5042			.data		= &ipv6_devconf.temp_prefered_lft,
5043			.maxlen		= sizeof(int),
5044			.mode		= 0644,
5045			.proc_handler	= proc_dointvec,
5046		},
5047		{
5048			.procname	= "regen_max_retry",
5049			.data		= &ipv6_devconf.regen_max_retry,
5050			.maxlen		= sizeof(int),
5051			.mode		= 0644,
5052			.proc_handler	= proc_dointvec,
5053		},
5054		{
5055			.procname	= "max_desync_factor",
5056			.data		= &ipv6_devconf.max_desync_factor,
5057			.maxlen		= sizeof(int),
5058			.mode		= 0644,
5059			.proc_handler	= proc_dointvec,
5060		},
5061		{
5062			.procname	= "max_addresses",
5063			.data		= &ipv6_devconf.max_addresses,
5064			.maxlen		= sizeof(int),
5065			.mode		= 0644,
5066			.proc_handler	= proc_dointvec,
5067		},
5068		{
5069			.procname	= "accept_ra_defrtr",
5070			.data		= &ipv6_devconf.accept_ra_defrtr,
5071			.maxlen		= sizeof(int),
5072			.mode		= 0644,
5073			.proc_handler	= proc_dointvec,
5074		},
5075		{
5076			.procname	= "accept_ra_pinfo",
5077			.data		= &ipv6_devconf.accept_ra_pinfo,
5078			.maxlen		= sizeof(int),
5079			.mode		= 0644,
5080			.proc_handler	= proc_dointvec,
5081		},
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
5082#ifdef CONFIG_IPV6_ROUTER_PREF
5083		{
5084			.procname	= "accept_ra_rtr_pref",
5085			.data		= &ipv6_devconf.accept_ra_rtr_pref,
5086			.maxlen		= sizeof(int),
5087			.mode		= 0644,
5088			.proc_handler	= proc_dointvec,
5089		},
5090		{
5091			.procname	= "router_probe_interval",
5092			.data		= &ipv6_devconf.rtr_probe_interval,
5093			.maxlen		= sizeof(int),
5094			.mode		= 0644,
5095			.proc_handler	= proc_dointvec_jiffies,
5096		},
5097#ifdef CONFIG_IPV6_ROUTE_INFO
5098		{
5099			.procname	= "accept_ra_rt_info_max_plen",
5100			.data		= &ipv6_devconf.accept_ra_rt_info_max_plen,
5101			.maxlen		= sizeof(int),
5102			.mode		= 0644,
5103			.proc_handler	= proc_dointvec,
5104		},
5105#endif
5106#endif
5107		{
5108			.procname	= "proxy_ndp",
5109			.data		= &ipv6_devconf.proxy_ndp,
5110			.maxlen		= sizeof(int),
5111			.mode		= 0644,
5112			.proc_handler	= addrconf_sysctl_proxy_ndp,
5113		},
5114		{
5115			.procname	= "accept_source_route",
5116			.data		= &ipv6_devconf.accept_source_route,
5117			.maxlen		= sizeof(int),
5118			.mode		= 0644,
5119			.proc_handler	= proc_dointvec,
5120		},
 
 
 
 
 
 
 
5121#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5122		{
5123			.procname       = "optimistic_dad",
5124			.data           = &ipv6_devconf.optimistic_dad,
5125			.maxlen         = sizeof(int),
5126			.mode           = 0644,
5127			.proc_handler   = proc_dointvec,
5128
5129		},
 
 
 
 
 
 
5130#endif
5131#ifdef CONFIG_IPV6_MROUTE
5132		{
5133			.procname	= "mc_forwarding",
5134			.data		= &ipv6_devconf.mc_forwarding,
5135			.maxlen		= sizeof(int),
5136			.mode		= 0444,
5137			.proc_handler	= proc_dointvec,
5138		},
5139#endif
5140		{
5141			.procname	= "disable_ipv6",
5142			.data		= &ipv6_devconf.disable_ipv6,
5143			.maxlen		= sizeof(int),
5144			.mode		= 0644,
5145			.proc_handler	= addrconf_sysctl_disable,
5146		},
5147		{
5148			.procname	= "accept_dad",
5149			.data		= &ipv6_devconf.accept_dad,
5150			.maxlen		= sizeof(int),
5151			.mode		= 0644,
5152			.proc_handler	= proc_dointvec,
5153		},
5154		{
5155			.procname       = "force_tllao",
5156			.data           = &ipv6_devconf.force_tllao,
5157			.maxlen         = sizeof(int),
5158			.mode           = 0644,
5159			.proc_handler   = proc_dointvec
5160		},
5161		{
5162			.procname       = "ndisc_notify",
5163			.data           = &ipv6_devconf.ndisc_notify,
5164			.maxlen         = sizeof(int),
5165			.mode           = 0644,
5166			.proc_handler   = proc_dointvec
5167		},
5168		{
5169			.procname	= "suppress_frag_ndisc",
5170			.data		= &ipv6_devconf.suppress_frag_ndisc,
5171			.maxlen		= sizeof(int),
5172			.mode		= 0644,
5173			.proc_handler	= proc_dointvec
5174		},
5175		{
5176			/* sentinel */
5177		}
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
5178	},
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
5179};
5180
5181static int __addrconf_sysctl_register(struct net *net, char *dev_name,
5182		struct inet6_dev *idev, struct ipv6_devconf *p)
5183{
5184	int i;
5185	struct addrconf_sysctl_table *t;
5186	char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
5187
5188	t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
5189	if (t == NULL)
5190		goto out;
5191
5192	for (i = 0; t->addrconf_vars[i].data; i++) {
5193		t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
5194		t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
5195		t->addrconf_vars[i].extra2 = net;
 
 
 
 
 
 
5196	}
5197
5198	snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
5199
5200	t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
5201	if (t->sysctl_header == NULL)
5202		goto free;
5203
5204	p->sysctl = t;
 
 
 
 
 
 
 
5205	return 0;
5206
5207free:
5208	kfree(t);
5209out:
5210	return -ENOBUFS;
5211}
5212
5213static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
 
5214{
5215	struct addrconf_sysctl_table *t;
5216
5217	if (p->sysctl == NULL)
5218		return;
5219
5220	t = p->sysctl;
5221	p->sysctl = NULL;
5222	unregister_net_sysctl_table(t->sysctl_header);
5223	kfree(t);
 
 
5224}
5225
5226static void addrconf_sysctl_register(struct inet6_dev *idev)
5227{
5228	neigh_sysctl_register(idev->dev, idev->nd_parms,
5229			      &ndisc_ifinfo_sysctl_change);
5230	__addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
5231					idev, &idev->cnf);
 
 
 
 
 
 
 
 
 
 
 
5232}
5233
5234static void addrconf_sysctl_unregister(struct inet6_dev *idev)
5235{
5236	__addrconf_sysctl_unregister(&idev->cnf);
 
5237	neigh_sysctl_unregister(idev->nd_parms);
5238}
5239
5240
5241#endif
5242
5243static int __net_init addrconf_init_net(struct net *net)
5244{
5245	int err = -ENOMEM;
5246	struct ipv6_devconf *all, *dflt;
5247
5248	all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
5249	if (all == NULL)
5250		goto err_alloc_all;
5251
5252	dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
5253	if (dflt == NULL)
5254		goto err_alloc_dflt;
5255
5256	/* these will be inherited by all namespaces */
5257	dflt->autoconf = ipv6_defaults.autoconf;
5258	dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
5259
 
 
 
5260	net->ipv6.devconf_all = all;
5261	net->ipv6.devconf_dflt = dflt;
5262
5263#ifdef CONFIG_SYSCTL
5264	err = __addrconf_sysctl_register(net, "all", NULL, all);
5265	if (err < 0)
5266		goto err_reg_all;
5267
5268	err = __addrconf_sysctl_register(net, "default", NULL, dflt);
5269	if (err < 0)
5270		goto err_reg_dflt;
5271#endif
5272	return 0;
5273
5274#ifdef CONFIG_SYSCTL
5275err_reg_dflt:
5276	__addrconf_sysctl_unregister(all);
5277err_reg_all:
5278	kfree(dflt);
5279#endif
5280err_alloc_dflt:
5281	kfree(all);
5282err_alloc_all:
5283	return err;
5284}
5285
5286static void __net_exit addrconf_exit_net(struct net *net)
5287{
5288#ifdef CONFIG_SYSCTL
5289	__addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
5290	__addrconf_sysctl_unregister(net->ipv6.devconf_all);
 
 
5291#endif
5292	if (!net_eq(net, &init_net)) {
5293		kfree(net->ipv6.devconf_dflt);
5294		kfree(net->ipv6.devconf_all);
5295	}
5296}
5297
5298static struct pernet_operations addrconf_ops = {
5299	.init = addrconf_init_net,
5300	.exit = addrconf_exit_net,
5301};
5302
5303static struct rtnl_af_ops inet6_ops = {
5304	.family		  = AF_INET6,
5305	.fill_link_af	  = inet6_fill_link_af,
5306	.get_link_af_size = inet6_get_link_af_size,
 
5307	.set_link_af	  = inet6_set_link_af,
5308};
5309
5310/*
5311 *	Init / cleanup code
5312 */
5313
5314int __init addrconf_init(void)
5315{
 
5316	int i, err;
5317
5318	err = ipv6_addr_label_init();
5319	if (err < 0) {
5320		pr_crit("%s: cannot initialize default policy table: %d\n",
5321			__func__, err);
5322		goto out;
5323	}
5324
5325	err = register_pernet_subsys(&addrconf_ops);
5326	if (err < 0)
5327		goto out_addrlabel;
5328
5329	addrconf_wq = create_workqueue("ipv6_addrconf");
5330	if (!addrconf_wq) {
5331		err = -ENOMEM;
5332		goto out_nowq;
5333	}
5334
5335	/* The addrconf netdev notifier requires that loopback_dev
5336	 * has it's ipv6 private information allocated and setup
5337	 * before it can bring up and give link-local addresses
5338	 * to other devices which are up.
5339	 *
5340	 * Unfortunately, loopback_dev is not necessarily the first
5341	 * entry in the global dev_base list of net devices.  In fact,
5342	 * it is likely to be the very last entry on that list.
5343	 * So this causes the notifier registry below to try and
5344	 * give link-local addresses to all devices besides loopback_dev
5345	 * first, then loopback_dev, which cases all the non-loopback_dev
5346	 * devices to fail to get a link-local address.
5347	 *
5348	 * So, as a temporary fix, allocate the ipv6 structure for
5349	 * loopback_dev first by hand.
5350	 * Longer term, all of the dependencies ipv6 has upon the loopback
5351	 * device and it being up should be removed.
5352	 */
5353	rtnl_lock();
5354	if (!ipv6_add_dev(init_net.loopback_dev))
5355		err = -ENOMEM;
5356	rtnl_unlock();
5357	if (err)
 
5358		goto errlo;
 
 
 
5359
5360	for (i = 0; i < IN6_ADDR_HSIZE; i++)
5361		INIT_HLIST_HEAD(&inet6_addr_lst[i]);
5362
5363	register_netdevice_notifier(&ipv6_dev_notf);
5364
5365	addrconf_verify();
5366
5367	rtnl_af_register(&inet6_ops);
5368
5369	err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
5370			      NULL);
5371	if (err < 0)
5372		goto errout;
5373
5374	/* Only the first call to __rtnl_register can fail */
5375	__rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
5376	__rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
5377	__rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
5378			inet6_dump_ifaddr, NULL);
5379	__rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
5380			inet6_dump_ifmcaddr, NULL);
5381	__rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
5382			inet6_dump_ifacaddr, NULL);
5383	__rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
5384			inet6_netconf_dump_devconf, NULL);
5385
5386	ipv6_addr_label_rtnl_register();
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
5387
5388	return 0;
5389errout:
 
5390	rtnl_af_unregister(&inet6_ops);
5391	unregister_netdevice_notifier(&ipv6_dev_notf);
5392errlo:
5393	destroy_workqueue(addrconf_wq);
5394out_nowq:
5395	unregister_pernet_subsys(&addrconf_ops);
5396out_addrlabel:
5397	ipv6_addr_label_cleanup();
5398out:
5399	return err;
5400}
5401
5402void addrconf_cleanup(void)
5403{
5404	struct net_device *dev;
5405	int i;
5406
5407	unregister_netdevice_notifier(&ipv6_dev_notf);
5408	unregister_pernet_subsys(&addrconf_ops);
5409	ipv6_addr_label_cleanup();
5410
5411	rtnl_lock();
5412
5413	__rtnl_af_unregister(&inet6_ops);
5414
5415	/* clean dev list */
5416	for_each_netdev(&init_net, dev) {
5417		if (__in6_dev_get(dev) == NULL)
5418			continue;
5419		addrconf_ifdown(dev, 1);
5420	}
5421	addrconf_ifdown(init_net.loopback_dev, 2);
5422
5423	/*
5424	 *	Check hash table.
5425	 */
5426	spin_lock_bh(&addrconf_hash_lock);
5427	for (i = 0; i < IN6_ADDR_HSIZE; i++)
5428		WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5429	spin_unlock_bh(&addrconf_hash_lock);
5430	cancel_delayed_work(&addr_chk_work);
5431	rtnl_unlock();
5432
5433	destroy_workqueue(addrconf_wq);
5434}