1/*
   2 *	NET3	IP device support routines.
   3 *
   4 *		This program is free software; you can redistribute it and/or
   5 *		modify it under the terms of the GNU General Public License
   6 *		as published by the Free Software Foundation; either version
   7 *		2 of the License, or (at your option) any later version.
   8 *
   9 *	Derived from the IP parts of dev.c 1.0.19
  10 * 		Authors:	Ross Biro
  11 *				Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
  12 *				Mark Evans, <evansmp@uhura.aston.ac.uk>
  13 *
  14 *	Additional Authors:
  15 *		Alan Cox, <gw4pts@gw4pts.ampr.org>
  16 *		Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
  17 *
  18 *	Changes:
  19 *		Alexey Kuznetsov:	pa_* fields are replaced with ifaddr
  20 *					lists.
  21 *		Cyrus Durgin:		updated for kmod
  22 *		Matthias Andree:	in devinet_ioctl, compare label and
  23 *					address (4.4BSD alias style support),
  24 *					fall back to comparing just the label
  25 *					if no match found.
  26 */
  27
  28
  29#include <linux/uaccess.h>
  30#include <linux/bitops.h>
  31#include <linux/capability.h>
  32#include <linux/module.h>
  33#include <linux/types.h>
  34#include <linux/kernel.h>
  35#include <linux/sched/signal.h>
  36#include <linux/string.h>
  37#include <linux/mm.h>
  38#include <linux/socket.h>
  39#include <linux/sockios.h>
  40#include <linux/in.h>
  41#include <linux/errno.h>
  42#include <linux/interrupt.h>
  43#include <linux/if_addr.h>
  44#include <linux/if_ether.h>
  45#include <linux/inet.h>
  46#include <linux/netdevice.h>
  47#include <linux/etherdevice.h>
  48#include <linux/skbuff.h>
  49#include <linux/init.h>
  50#include <linux/notifier.h>
  51#include <linux/inetdevice.h>
  52#include <linux/igmp.h>
  53#include <linux/slab.h>
  54#include <linux/hash.h>
  55#ifdef CONFIG_SYSCTL
  56#include <linux/sysctl.h>
  57#endif
  58#include <linux/kmod.h>
  59#include <linux/netconf.h>
  60
  61#include <net/arp.h>
  62#include <net/ip.h>
  63#include <net/route.h>
  64#include <net/ip_fib.h>
  65#include <net/rtnetlink.h>
  66#include <net/net_namespace.h>
  67#include <net/addrconf.h>
 
  68
  69static struct ipv4_devconf ipv4_devconf = {
  70	.data = {
  71		[IPV4_DEVCONF_ACCEPT_REDIRECTS - 1] = 1,
  72		[IPV4_DEVCONF_SEND_REDIRECTS - 1] = 1,
  73		[IPV4_DEVCONF_SECURE_REDIRECTS - 1] = 1,
  74		[IPV4_DEVCONF_SHARED_MEDIA - 1] = 1,
  75		[IPV4_DEVCONF_IGMPV2_UNSOLICITED_REPORT_INTERVAL - 1] = 10000 /*ms*/,
  76		[IPV4_DEVCONF_IGMPV3_UNSOLICITED_REPORT_INTERVAL - 1] =  1000 /*ms*/,
  77	},
  78};
  79
  80static struct ipv4_devconf ipv4_devconf_dflt = {
  81	.data = {
  82		[IPV4_DEVCONF_ACCEPT_REDIRECTS - 1] = 1,
  83		[IPV4_DEVCONF_SEND_REDIRECTS - 1] = 1,
  84		[IPV4_DEVCONF_SECURE_REDIRECTS - 1] = 1,
  85		[IPV4_DEVCONF_SHARED_MEDIA - 1] = 1,
  86		[IPV4_DEVCONF_ACCEPT_SOURCE_ROUTE - 1] = 1,
  87		[IPV4_DEVCONF_IGMPV2_UNSOLICITED_REPORT_INTERVAL - 1] = 10000 /*ms*/,
  88		[IPV4_DEVCONF_IGMPV3_UNSOLICITED_REPORT_INTERVAL - 1] =  1000 /*ms*/,
  89	},
  90};
  91
  92#define IPV4_DEVCONF_DFLT(net, attr) \
  93	IPV4_DEVCONF((*net->ipv4.devconf_dflt), attr)
  94
  95static const struct nla_policy ifa_ipv4_policy[IFA_MAX+1] = {
  96	[IFA_LOCAL]     	= { .type = NLA_U32 },
  97	[IFA_ADDRESS]   	= { .type = NLA_U32 },
  98	[IFA_BROADCAST] 	= { .type = NLA_U32 },
  99	[IFA_LABEL]     	= { .type = NLA_STRING, .len = IFNAMSIZ - 1 },
 100	[IFA_CACHEINFO]		= { .len = sizeof(struct ifa_cacheinfo) },
 101	[IFA_FLAGS]		= { .type = NLA_U32 },
 102};
 103
 104#define IN4_ADDR_HSIZE_SHIFT	8
 105#define IN4_ADDR_HSIZE		(1U << IN4_ADDR_HSIZE_SHIFT)
 106
 
 
 107static struct hlist_head inet_addr_lst[IN4_ADDR_HSIZE];
 
 108
 109static u32 inet_addr_hash(const struct net *net, __be32 addr)
 110{
 111	u32 val = (__force u32) addr ^ net_hash_mix(net);
 112
 113	return hash_32(val, IN4_ADDR_HSIZE_SHIFT);
 
 114}
 115
 116static void inet_hash_insert(struct net *net, struct in_ifaddr *ifa)
 117{
 118	u32 hash = inet_addr_hash(net, ifa->ifa_local);
 119
 120	ASSERT_RTNL();
 121	hlist_add_head_rcu(&ifa->hash, &inet_addr_lst[hash]);
 
 122}
 123
 124static void inet_hash_remove(struct in_ifaddr *ifa)
 125{
 126	ASSERT_RTNL();
 127	hlist_del_init_rcu(&ifa->hash);
 
 128}
 129
 130/**
 131 * __ip_dev_find - find the first device with a given source address.
 132 * @net: the net namespace
 133 * @addr: the source address
 134 * @devref: if true, take a reference on the found device
 135 *
 136 * If a caller uses devref=false, it should be protected by RCU, or RTNL
 137 */
 138struct net_device *__ip_dev_find(struct net *net, __be32 addr, bool devref)
 139{
 
 140	struct net_device *result = NULL;
 141	struct in_ifaddr *ifa;
 
 142
 143	rcu_read_lock();
 144	ifa = inet_lookup_ifaddr_rcu(net, addr);
 145	if (!ifa) {
 
 
 
 
 
 
 
 
 
 146		struct flowi4 fl4 = { .daddr = addr };
 147		struct fib_result res = { 0 };
 148		struct fib_table *local;
 149
 150		/* Fallback to FIB local table so that communication
 151		 * over loopback subnets work.
 152		 */
 153		local = fib_get_table(net, RT_TABLE_LOCAL);
 154		if (local &&
 155		    !fib_table_lookup(local, &fl4, &res, FIB_LOOKUP_NOREF) &&
 156		    res.type == RTN_LOCAL)
 157			result = FIB_RES_DEV(res);
 158	} else {
 159		result = ifa->ifa_dev->dev;
 160	}
 161	if (result && devref)
 162		dev_hold(result);
 163	rcu_read_unlock();
 164	return result;
 165}
 166EXPORT_SYMBOL(__ip_dev_find);
 167
 168/* called under RCU lock */
 169struct in_ifaddr *inet_lookup_ifaddr_rcu(struct net *net, __be32 addr)
 170{
 171	u32 hash = inet_addr_hash(net, addr);
 172	struct in_ifaddr *ifa;
 173
 174	hlist_for_each_entry_rcu(ifa, &inet_addr_lst[hash], hash)
 175		if (ifa->ifa_local == addr &&
 176		    net_eq(dev_net(ifa->ifa_dev->dev), net))
 177			return ifa;
 178
 179	return NULL;
 180}
 181
 182static void rtmsg_ifa(int event, struct in_ifaddr *, struct nlmsghdr *, u32);
 183
 184static BLOCKING_NOTIFIER_HEAD(inetaddr_chain);
 185static BLOCKING_NOTIFIER_HEAD(inetaddr_validator_chain);
 186static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
 187			 int destroy);
 188#ifdef CONFIG_SYSCTL
 189static int devinet_sysctl_register(struct in_device *idev);
 190static void devinet_sysctl_unregister(struct in_device *idev);
 191#else
 192static int devinet_sysctl_register(struct in_device *idev)
 193{
 194	return 0;
 195}
 196static void devinet_sysctl_unregister(struct in_device *idev)
 197{
 198}
 199#endif
 200
 201/* Locks all the inet devices. */
 202
 203static struct in_ifaddr *inet_alloc_ifa(void)
 204{
 205	return kzalloc(sizeof(struct in_ifaddr), GFP_KERNEL);
 206}
 207
 208static void inet_rcu_free_ifa(struct rcu_head *head)
 209{
 210	struct in_ifaddr *ifa = container_of(head, struct in_ifaddr, rcu_head);
 211	if (ifa->ifa_dev)
 212		in_dev_put(ifa->ifa_dev);
 213	kfree(ifa);
 214}
 215
 216static void inet_free_ifa(struct in_ifaddr *ifa)
 217{
 218	call_rcu(&ifa->rcu_head, inet_rcu_free_ifa);
 219}
 220
 221void in_dev_finish_destroy(struct in_device *idev)
 222{
 223	struct net_device *dev = idev->dev;
 224
 225	WARN_ON(idev->ifa_list);
 226	WARN_ON(idev->mc_list);
 227	kfree(rcu_dereference_protected(idev->mc_hash, 1));
 228#ifdef NET_REFCNT_DEBUG
 229	pr_debug("%s: %p=%s\n", __func__, idev, dev ? dev->name : "NIL");
 230#endif
 231	dev_put(dev);
 232	if (!idev->dead)
 233		pr_err("Freeing alive in_device %p\n", idev);
 234	else
 235		kfree(idev);
 236}
 237EXPORT_SYMBOL(in_dev_finish_destroy);
 238
 239static struct in_device *inetdev_init(struct net_device *dev)
 240{
 241	struct in_device *in_dev;
 242	int err = -ENOMEM;
 243
 244	ASSERT_RTNL();
 245
 246	in_dev = kzalloc(sizeof(*in_dev), GFP_KERNEL);
 247	if (!in_dev)
 248		goto out;
 249	memcpy(&in_dev->cnf, dev_net(dev)->ipv4.devconf_dflt,
 250			sizeof(in_dev->cnf));
 251	in_dev->cnf.sysctl = NULL;
 252	in_dev->dev = dev;
 253	in_dev->arp_parms = neigh_parms_alloc(dev, &arp_tbl);
 254	if (!in_dev->arp_parms)
 255		goto out_kfree;
 256	if (IPV4_DEVCONF(in_dev->cnf, FORWARDING))
 257		dev_disable_lro(dev);
 258	/* Reference in_dev->dev */
 259	dev_hold(dev);
 260	/* Account for reference dev->ip_ptr (below) */
 261	refcount_set(&in_dev->refcnt, 1);
 262
 263	err = devinet_sysctl_register(in_dev);
 264	if (err) {
 265		in_dev->dead = 1;
 266		in_dev_put(in_dev);
 267		in_dev = NULL;
 268		goto out;
 269	}
 270	ip_mc_init_dev(in_dev);
 271	if (dev->flags & IFF_UP)
 272		ip_mc_up(in_dev);
 273
 274	/* we can receive as soon as ip_ptr is set -- do this last */
 275	rcu_assign_pointer(dev->ip_ptr, in_dev);
 276out:
 277	return in_dev ?: ERR_PTR(err);
 278out_kfree:
 279	kfree(in_dev);
 280	in_dev = NULL;
 281	goto out;
 282}
 283
 284static void in_dev_rcu_put(struct rcu_head *head)
 285{
 286	struct in_device *idev = container_of(head, struct in_device, rcu_head);
 287	in_dev_put(idev);
 288}
 289
 290static void inetdev_destroy(struct in_device *in_dev)
 291{
 292	struct in_ifaddr *ifa;
 293	struct net_device *dev;
 294
 295	ASSERT_RTNL();
 296
 297	dev = in_dev->dev;
 298
 299	in_dev->dead = 1;
 300
 301	ip_mc_destroy_dev(in_dev);
 302
 303	while ((ifa = in_dev->ifa_list) != NULL) {
 304		inet_del_ifa(in_dev, &in_dev->ifa_list, 0);
 305		inet_free_ifa(ifa);
 306	}
 307
 308	RCU_INIT_POINTER(dev->ip_ptr, NULL);
 309
 310	devinet_sysctl_unregister(in_dev);
 311	neigh_parms_release(&arp_tbl, in_dev->arp_parms);
 312	arp_ifdown(dev);
 313
 314	call_rcu(&in_dev->rcu_head, in_dev_rcu_put);
 315}
 316
 317int inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b)
 318{
 319	rcu_read_lock();
 320	for_primary_ifa(in_dev) {
 321		if (inet_ifa_match(a, ifa)) {
 322			if (!b || inet_ifa_match(b, ifa)) {
 323				rcu_read_unlock();
 324				return 1;
 325			}
 326		}
 327	} endfor_ifa(in_dev);
 328	rcu_read_unlock();
 329	return 0;
 330}
 331
 332static void __inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
 333			 int destroy, struct nlmsghdr *nlh, u32 portid)
 334{
 335	struct in_ifaddr *promote = NULL;
 336	struct in_ifaddr *ifa, *ifa1 = *ifap;
 337	struct in_ifaddr *last_prim = in_dev->ifa_list;
 338	struct in_ifaddr *prev_prom = NULL;
 339	int do_promote = IN_DEV_PROMOTE_SECONDARIES(in_dev);
 340
 341	ASSERT_RTNL();
 342
 343	if (in_dev->dead)
 344		goto no_promotions;
 345
 346	/* 1. Deleting primary ifaddr forces deletion all secondaries
 347	 * unless alias promotion is set
 348	 **/
 349
 350	if (!(ifa1->ifa_flags & IFA_F_SECONDARY)) {
 351		struct in_ifaddr **ifap1 = &ifa1->ifa_next;
 352
 353		while ((ifa = *ifap1) != NULL) {
 354			if (!(ifa->ifa_flags & IFA_F_SECONDARY) &&
 355			    ifa1->ifa_scope <= ifa->ifa_scope)
 356				last_prim = ifa;
 357
 358			if (!(ifa->ifa_flags & IFA_F_SECONDARY) ||
 359			    ifa1->ifa_mask != ifa->ifa_mask ||
 360			    !inet_ifa_match(ifa1->ifa_address, ifa)) {
 361				ifap1 = &ifa->ifa_next;
 362				prev_prom = ifa;
 363				continue;
 364			}
 365
 366			if (!do_promote) {
 367				inet_hash_remove(ifa);
 368				*ifap1 = ifa->ifa_next;
 369
 370				rtmsg_ifa(RTM_DELADDR, ifa, nlh, portid);
 371				blocking_notifier_call_chain(&inetaddr_chain,
 372						NETDEV_DOWN, ifa);
 373				inet_free_ifa(ifa);
 374			} else {
 375				promote = ifa;
 376				break;
 377			}
 378		}
 379	}
 380
 381	/* On promotion all secondaries from subnet are changing
 382	 * the primary IP, we must remove all their routes silently
 383	 * and later to add them back with new prefsrc. Do this
 384	 * while all addresses are on the device list.
 385	 */
 386	for (ifa = promote; ifa; ifa = ifa->ifa_next) {
 387		if (ifa1->ifa_mask == ifa->ifa_mask &&
 388		    inet_ifa_match(ifa1->ifa_address, ifa))
 389			fib_del_ifaddr(ifa, ifa1);
 390	}
 391
 392no_promotions:
 393	/* 2. Unlink it */
 394
 395	*ifap = ifa1->ifa_next;
 396	inet_hash_remove(ifa1);
 397
 398	/* 3. Announce address deletion */
 399
 400	/* Send message first, then call notifier.
 401	   At first sight, FIB update triggered by notifier
 402	   will refer to already deleted ifaddr, that could confuse
 403	   netlink listeners. It is not true: look, gated sees
 404	   that route deleted and if it still thinks that ifaddr
 405	   is valid, it will try to restore deleted routes... Grr.
 406	   So that, this order is correct.
 407	 */
 408	rtmsg_ifa(RTM_DELADDR, ifa1, nlh, portid);
 409	blocking_notifier_call_chain(&inetaddr_chain, NETDEV_DOWN, ifa1);
 410
 411	if (promote) {
 412		struct in_ifaddr *next_sec = promote->ifa_next;
 413
 414		if (prev_prom) {
 415			prev_prom->ifa_next = promote->ifa_next;
 416			promote->ifa_next = last_prim->ifa_next;
 417			last_prim->ifa_next = promote;
 418		}
 419
 420		promote->ifa_flags &= ~IFA_F_SECONDARY;
 421		rtmsg_ifa(RTM_NEWADDR, promote, nlh, portid);
 422		blocking_notifier_call_chain(&inetaddr_chain,
 423				NETDEV_UP, promote);
 424		for (ifa = next_sec; ifa; ifa = ifa->ifa_next) {
 425			if (ifa1->ifa_mask != ifa->ifa_mask ||
 426			    !inet_ifa_match(ifa1->ifa_address, ifa))
 427					continue;
 428			fib_add_ifaddr(ifa);
 429		}
 430
 431	}
 432	if (destroy)
 433		inet_free_ifa(ifa1);
 434}
 435
 436static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
 437			 int destroy)
 438{
 439	__inet_del_ifa(in_dev, ifap, destroy, NULL, 0);
 440}
 441
 442static void check_lifetime(struct work_struct *work);
 443
 444static DECLARE_DELAYED_WORK(check_lifetime_work, check_lifetime);
 445
 446static int __inet_insert_ifa(struct in_ifaddr *ifa, struct nlmsghdr *nlh,
 447			     u32 portid, struct netlink_ext_ack *extack)
 448{
 449	struct in_device *in_dev = ifa->ifa_dev;
 450	struct in_ifaddr *ifa1, **ifap, **last_primary;
 451	struct in_validator_info ivi;
 452	int ret;
 453
 454	ASSERT_RTNL();
 455
 456	if (!ifa->ifa_local) {
 457		inet_free_ifa(ifa);
 458		return 0;
 459	}
 460
 461	ifa->ifa_flags &= ~IFA_F_SECONDARY;
 462	last_primary = &in_dev->ifa_list;
 463
 464	for (ifap = &in_dev->ifa_list; (ifa1 = *ifap) != NULL;
 465	     ifap = &ifa1->ifa_next) {
 466		if (!(ifa1->ifa_flags & IFA_F_SECONDARY) &&
 467		    ifa->ifa_scope <= ifa1->ifa_scope)
 468			last_primary = &ifa1->ifa_next;
 469		if (ifa1->ifa_mask == ifa->ifa_mask &&
 470		    inet_ifa_match(ifa1->ifa_address, ifa)) {
 471			if (ifa1->ifa_local == ifa->ifa_local) {
 472				inet_free_ifa(ifa);
 473				return -EEXIST;
 474			}
 475			if (ifa1->ifa_scope != ifa->ifa_scope) {
 476				inet_free_ifa(ifa);
 477				return -EINVAL;
 478			}
 479			ifa->ifa_flags |= IFA_F_SECONDARY;
 480		}
 481	}
 482
 483	/* Allow any devices that wish to register ifaddr validtors to weigh
 484	 * in now, before changes are committed.  The rntl lock is serializing
 485	 * access here, so the state should not change between a validator call
 486	 * and a final notify on commit.  This isn't invoked on promotion under
 487	 * the assumption that validators are checking the address itself, and
 488	 * not the flags.
 489	 */
 490	ivi.ivi_addr = ifa->ifa_address;
 491	ivi.ivi_dev = ifa->ifa_dev;
 492	ivi.extack = extack;
 493	ret = blocking_notifier_call_chain(&inetaddr_validator_chain,
 494					   NETDEV_UP, &ivi);
 495	ret = notifier_to_errno(ret);
 496	if (ret) {
 497		inet_free_ifa(ifa);
 498		return ret;
 499	}
 500
 501	if (!(ifa->ifa_flags & IFA_F_SECONDARY)) {
 502		prandom_seed((__force u32) ifa->ifa_local);
 503		ifap = last_primary;
 504	}
 505
 506	ifa->ifa_next = *ifap;
 507	*ifap = ifa;
 508
 509	inet_hash_insert(dev_net(in_dev->dev), ifa);
 510
 511	cancel_delayed_work(&check_lifetime_work);
 512	queue_delayed_work(system_power_efficient_wq, &check_lifetime_work, 0);
 513
 514	/* Send message first, then call notifier.
 515	   Notifier will trigger FIB update, so that
 516	   listeners of netlink will know about new ifaddr */
 517	rtmsg_ifa(RTM_NEWADDR, ifa, nlh, portid);
 518	blocking_notifier_call_chain(&inetaddr_chain, NETDEV_UP, ifa);
 519
 520	return 0;
 521}
 522
 523static int inet_insert_ifa(struct in_ifaddr *ifa)
 524{
 525	return __inet_insert_ifa(ifa, NULL, 0, NULL);
 526}
 527
 528static int inet_set_ifa(struct net_device *dev, struct in_ifaddr *ifa)
 529{
 530	struct in_device *in_dev = __in_dev_get_rtnl(dev);
 531
 532	ASSERT_RTNL();
 533
 534	if (!in_dev) {
 535		inet_free_ifa(ifa);
 536		return -ENOBUFS;
 537	}
 538	ipv4_devconf_setall(in_dev);
 539	neigh_parms_data_state_setall(in_dev->arp_parms);
 540	if (ifa->ifa_dev != in_dev) {
 541		WARN_ON(ifa->ifa_dev);
 542		in_dev_hold(in_dev);
 543		ifa->ifa_dev = in_dev;
 544	}
 545	if (ipv4_is_loopback(ifa->ifa_local))
 546		ifa->ifa_scope = RT_SCOPE_HOST;
 547	return inet_insert_ifa(ifa);
 548}
 549
 550/* Caller must hold RCU or RTNL :
 551 * We dont take a reference on found in_device
 552 */
 553struct in_device *inetdev_by_index(struct net *net, int ifindex)
 554{
 555	struct net_device *dev;
 556	struct in_device *in_dev = NULL;
 557
 558	rcu_read_lock();
 559	dev = dev_get_by_index_rcu(net, ifindex);
 560	if (dev)
 561		in_dev = rcu_dereference_rtnl(dev->ip_ptr);
 562	rcu_read_unlock();
 563	return in_dev;
 564}
 565EXPORT_SYMBOL(inetdev_by_index);
 566
 567/* Called only from RTNL semaphored context. No locks. */
 568
 569struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix,
 570				    __be32 mask)
 571{
 572	ASSERT_RTNL();
 573
 574	for_primary_ifa(in_dev) {
 575		if (ifa->ifa_mask == mask && inet_ifa_match(prefix, ifa))
 576			return ifa;
 577	} endfor_ifa(in_dev);
 578	return NULL;
 579}
 580
 581static int ip_mc_config(struct sock *sk, bool join, const struct in_ifaddr *ifa)
 582{
 583	struct ip_mreqn mreq = {
 584		.imr_multiaddr.s_addr = ifa->ifa_address,
 585		.imr_ifindex = ifa->ifa_dev->dev->ifindex,
 586	};
 587	int ret;
 588
 589	ASSERT_RTNL();
 590
 591	lock_sock(sk);
 592	if (join)
 593		ret = ip_mc_join_group(sk, &mreq);
 594	else
 595		ret = ip_mc_leave_group(sk, &mreq);
 596	release_sock(sk);
 597
 598	return ret;
 599}
 600
 601static int inet_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh,
 602			    struct netlink_ext_ack *extack)
 603{
 604	struct net *net = sock_net(skb->sk);
 605	struct nlattr *tb[IFA_MAX+1];
 606	struct in_device *in_dev;
 607	struct ifaddrmsg *ifm;
 608	struct in_ifaddr *ifa, **ifap;
 609	int err = -EINVAL;
 610
 611	ASSERT_RTNL();
 612
 613	err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy,
 614			  extack);
 615	if (err < 0)
 616		goto errout;
 617
 618	ifm = nlmsg_data(nlh);
 619	in_dev = inetdev_by_index(net, ifm->ifa_index);
 620	if (!in_dev) {
 621		err = -ENODEV;
 622		goto errout;
 623	}
 624
 625	for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
 626	     ifap = &ifa->ifa_next) {
 627		if (tb[IFA_LOCAL] &&
 628		    ifa->ifa_local != nla_get_in_addr(tb[IFA_LOCAL]))
 629			continue;
 630
 631		if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label))
 632			continue;
 633
 634		if (tb[IFA_ADDRESS] &&
 635		    (ifm->ifa_prefixlen != ifa->ifa_prefixlen ||
 636		    !inet_ifa_match(nla_get_in_addr(tb[IFA_ADDRESS]), ifa)))
 637			continue;
 638
 639		if (ipv4_is_multicast(ifa->ifa_address))
 640			ip_mc_config(net->ipv4.mc_autojoin_sk, false, ifa);
 641		__inet_del_ifa(in_dev, ifap, 1, nlh, NETLINK_CB(skb).portid);
 642		return 0;
 643	}
 644
 645	err = -EADDRNOTAVAIL;
 646errout:
 647	return err;
 648}
 649
 650#define INFINITY_LIFE_TIME	0xFFFFFFFF
 651
 652static void check_lifetime(struct work_struct *work)
 653{
 654	unsigned long now, next, next_sec, next_sched;
 655	struct in_ifaddr *ifa;
 656	struct hlist_node *n;
 657	int i;
 658
 659	now = jiffies;
 660	next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
 661
 662	for (i = 0; i < IN4_ADDR_HSIZE; i++) {
 663		bool change_needed = false;
 664
 665		rcu_read_lock();
 666		hlist_for_each_entry_rcu(ifa, &inet_addr_lst[i], hash) {
 667			unsigned long age;
 668
 669			if (ifa->ifa_flags & IFA_F_PERMANENT)
 670				continue;
 671
 672			/* We try to batch several events at once. */
 673			age = (now - ifa->ifa_tstamp +
 674			       ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
 675
 676			if (ifa->ifa_valid_lft != INFINITY_LIFE_TIME &&
 677			    age >= ifa->ifa_valid_lft) {
 678				change_needed = true;
 679			} else if (ifa->ifa_preferred_lft ==
 680				   INFINITY_LIFE_TIME) {
 681				continue;
 682			} else if (age >= ifa->ifa_preferred_lft) {
 683				if (time_before(ifa->ifa_tstamp +
 684						ifa->ifa_valid_lft * HZ, next))
 685					next = ifa->ifa_tstamp +
 686					       ifa->ifa_valid_lft * HZ;
 687
 688				if (!(ifa->ifa_flags & IFA_F_DEPRECATED))
 689					change_needed = true;
 690			} else if (time_before(ifa->ifa_tstamp +
 691					       ifa->ifa_preferred_lft * HZ,
 692					       next)) {
 693				next = ifa->ifa_tstamp +
 694				       ifa->ifa_preferred_lft * HZ;
 695			}
 696		}
 697		rcu_read_unlock();
 698		if (!change_needed)
 699			continue;
 700		rtnl_lock();
 701		hlist_for_each_entry_safe(ifa, n, &inet_addr_lst[i], hash) {
 702			unsigned long age;
 703
 704			if (ifa->ifa_flags & IFA_F_PERMANENT)
 705				continue;
 706
 707			/* We try to batch several events at once. */
 708			age = (now - ifa->ifa_tstamp +
 709			       ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
 710
 711			if (ifa->ifa_valid_lft != INFINITY_LIFE_TIME &&
 712			    age >= ifa->ifa_valid_lft) {
 713				struct in_ifaddr **ifap;
 714
 715				for (ifap = &ifa->ifa_dev->ifa_list;
 716				     *ifap != NULL; ifap = &(*ifap)->ifa_next) {
 717					if (*ifap == ifa) {
 718						inet_del_ifa(ifa->ifa_dev,
 719							     ifap, 1);
 720						break;
 721					}
 722				}
 723			} else if (ifa->ifa_preferred_lft !=
 724				   INFINITY_LIFE_TIME &&
 725				   age >= ifa->ifa_preferred_lft &&
 726				   !(ifa->ifa_flags & IFA_F_DEPRECATED)) {
 727				ifa->ifa_flags |= IFA_F_DEPRECATED;
 728				rtmsg_ifa(RTM_NEWADDR, ifa, NULL, 0);
 729			}
 730		}
 731		rtnl_unlock();
 732	}
 733
 734	next_sec = round_jiffies_up(next);
 735	next_sched = next;
 736
 737	/* If rounded timeout is accurate enough, accept it. */
 738	if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
 739		next_sched = next_sec;
 740
 741	now = jiffies;
 742	/* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
 743	if (time_before(next_sched, now + ADDRCONF_TIMER_FUZZ_MAX))
 744		next_sched = now + ADDRCONF_TIMER_FUZZ_MAX;
 745
 746	queue_delayed_work(system_power_efficient_wq, &check_lifetime_work,
 747			next_sched - now);
 748}
 749
 750static void set_ifa_lifetime(struct in_ifaddr *ifa, __u32 valid_lft,
 751			     __u32 prefered_lft)
 752{
 753	unsigned long timeout;
 754
 755	ifa->ifa_flags &= ~(IFA_F_PERMANENT | IFA_F_DEPRECATED);
 756
 757	timeout = addrconf_timeout_fixup(valid_lft, HZ);
 758	if (addrconf_finite_timeout(timeout))
 759		ifa->ifa_valid_lft = timeout;
 760	else
 761		ifa->ifa_flags |= IFA_F_PERMANENT;
 762
 763	timeout = addrconf_timeout_fixup(prefered_lft, HZ);
 764	if (addrconf_finite_timeout(timeout)) {
 765		if (timeout == 0)
 766			ifa->ifa_flags |= IFA_F_DEPRECATED;
 767		ifa->ifa_preferred_lft = timeout;
 768	}
 769	ifa->ifa_tstamp = jiffies;
 770	if (!ifa->ifa_cstamp)
 771		ifa->ifa_cstamp = ifa->ifa_tstamp;
 772}
 773
 774static struct in_ifaddr *rtm_to_ifaddr(struct net *net, struct nlmsghdr *nlh,
 775				       __u32 *pvalid_lft, __u32 *pprefered_lft)
 776{
 777	struct nlattr *tb[IFA_MAX+1];
 778	struct in_ifaddr *ifa;
 779	struct ifaddrmsg *ifm;
 780	struct net_device *dev;
 781	struct in_device *in_dev;
 782	int err;
 783
 784	err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy,
 785			  NULL);
 786	if (err < 0)
 787		goto errout;
 788
 789	ifm = nlmsg_data(nlh);
 790	err = -EINVAL;
 791	if (ifm->ifa_prefixlen > 32 || !tb[IFA_LOCAL])
 792		goto errout;
 793
 794	dev = __dev_get_by_index(net, ifm->ifa_index);
 795	err = -ENODEV;
 796	if (!dev)
 797		goto errout;
 798
 799	in_dev = __in_dev_get_rtnl(dev);
 800	err = -ENOBUFS;
 801	if (!in_dev)
 802		goto errout;
 803
 804	ifa = inet_alloc_ifa();
 805	if (!ifa)
 806		/*
 807		 * A potential indev allocation can be left alive, it stays
 808		 * assigned to its device and is destroy with it.
 809		 */
 810		goto errout;
 811
 812	ipv4_devconf_setall(in_dev);
 813	neigh_parms_data_state_setall(in_dev->arp_parms);
 814	in_dev_hold(in_dev);
 815
 816	if (!tb[IFA_ADDRESS])
 817		tb[IFA_ADDRESS] = tb[IFA_LOCAL];
 818
 819	INIT_HLIST_NODE(&ifa->hash);
 820	ifa->ifa_prefixlen = ifm->ifa_prefixlen;
 821	ifa->ifa_mask = inet_make_mask(ifm->ifa_prefixlen);
 822	ifa->ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) :
 823					 ifm->ifa_flags;
 824	ifa->ifa_scope = ifm->ifa_scope;
 825	ifa->ifa_dev = in_dev;
 826
 827	ifa->ifa_local = nla_get_in_addr(tb[IFA_LOCAL]);
 828	ifa->ifa_address = nla_get_in_addr(tb[IFA_ADDRESS]);
 829
 830	if (tb[IFA_BROADCAST])
 831		ifa->ifa_broadcast = nla_get_in_addr(tb[IFA_BROADCAST]);
 832
 833	if (tb[IFA_LABEL])
 834		nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ);
 835	else
 836		memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
 837
 838	if (tb[IFA_CACHEINFO]) {
 839		struct ifa_cacheinfo *ci;
 840
 841		ci = nla_data(tb[IFA_CACHEINFO]);
 842		if (!ci->ifa_valid || ci->ifa_prefered > ci->ifa_valid) {
 843			err = -EINVAL;
 844			goto errout_free;
 845		}
 846		*pvalid_lft = ci->ifa_valid;
 847		*pprefered_lft = ci->ifa_prefered;
 848	}
 849
 850	return ifa;
 851
 852errout_free:
 853	inet_free_ifa(ifa);
 854errout:
 855	return ERR_PTR(err);
 856}
 857
 858static struct in_ifaddr *find_matching_ifa(struct in_ifaddr *ifa)
 859{
 860	struct in_device *in_dev = ifa->ifa_dev;
 861	struct in_ifaddr *ifa1, **ifap;
 862
 863	if (!ifa->ifa_local)
 864		return NULL;
 865
 866	for (ifap = &in_dev->ifa_list; (ifa1 = *ifap) != NULL;
 867	     ifap = &ifa1->ifa_next) {
 868		if (ifa1->ifa_mask == ifa->ifa_mask &&
 869		    inet_ifa_match(ifa1->ifa_address, ifa) &&
 870		    ifa1->ifa_local == ifa->ifa_local)
 871			return ifa1;
 872	}
 873	return NULL;
 874}
 875
 876static int inet_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh,
 877			    struct netlink_ext_ack *extack)
 878{
 879	struct net *net = sock_net(skb->sk);
 880	struct in_ifaddr *ifa;
 881	struct in_ifaddr *ifa_existing;
 882	__u32 valid_lft = INFINITY_LIFE_TIME;
 883	__u32 prefered_lft = INFINITY_LIFE_TIME;
 884
 885	ASSERT_RTNL();
 886
 887	ifa = rtm_to_ifaddr(net, nlh, &valid_lft, &prefered_lft);
 888	if (IS_ERR(ifa))
 889		return PTR_ERR(ifa);
 890
 891	ifa_existing = find_matching_ifa(ifa);
 892	if (!ifa_existing) {
 893		/* It would be best to check for !NLM_F_CREATE here but
 894		 * userspace already relies on not having to provide this.
 895		 */
 896		set_ifa_lifetime(ifa, valid_lft, prefered_lft);
 897		if (ifa->ifa_flags & IFA_F_MCAUTOJOIN) {
 898			int ret = ip_mc_config(net->ipv4.mc_autojoin_sk,
 899					       true, ifa);
 900
 901			if (ret < 0) {
 902				inet_free_ifa(ifa);
 903				return ret;
 904			}
 905		}
 906		return __inet_insert_ifa(ifa, nlh, NETLINK_CB(skb).portid,
 907					 extack);
 908	} else {
 909		inet_free_ifa(ifa);
 910
 911		if (nlh->nlmsg_flags & NLM_F_EXCL ||
 912		    !(nlh->nlmsg_flags & NLM_F_REPLACE))
 913			return -EEXIST;
 914		ifa = ifa_existing;
 915		set_ifa_lifetime(ifa, valid_lft, prefered_lft);
 916		cancel_delayed_work(&check_lifetime_work);
 917		queue_delayed_work(system_power_efficient_wq,
 918				&check_lifetime_work, 0);
 919		rtmsg_ifa(RTM_NEWADDR, ifa, nlh, NETLINK_CB(skb).portid);
 920	}
 921	return 0;
 922}
 923
 924/*
 925 *	Determine a default network mask, based on the IP address.
 926 */
 927
 928static int inet_abc_len(__be32 addr)
 929{
 930	int rc = -1;	/* Something else, probably a multicast. */
 931
 932	if (ipv4_is_zeronet(addr))
 933		rc = 0;
 934	else {
 935		__u32 haddr = ntohl(addr);
 936
 937		if (IN_CLASSA(haddr))
 938			rc = 8;
 939		else if (IN_CLASSB(haddr))
 940			rc = 16;
 941		else if (IN_CLASSC(haddr))
 942			rc = 24;
 943	}
 944
 945	return rc;
 946}
 947
 948
 949int devinet_ioctl(struct net *net, unsigned int cmd, struct ifreq *ifr)
 950{
 
 951	struct sockaddr_in sin_orig;
 952	struct sockaddr_in *sin = (struct sockaddr_in *)&ifr->ifr_addr;
 953	struct in_device *in_dev;
 954	struct in_ifaddr **ifap = NULL;
 955	struct in_ifaddr *ifa = NULL;
 956	struct net_device *dev;
 957	char *colon;
 958	int ret = -EFAULT;
 959	int tryaddrmatch = 0;
 960
 961	ifr->ifr_name[IFNAMSIZ - 1] = 0;
 
 
 
 
 
 
 962
 963	/* save original address for comparison */
 964	memcpy(&sin_orig, sin, sizeof(*sin));
 965
 966	colon = strchr(ifr->ifr_name, ':');
 967	if (colon)
 968		*colon = 0;
 969
 970	dev_load(net, ifr->ifr_name);
 971
 972	switch (cmd) {
 973	case SIOCGIFADDR:	/* Get interface address */
 974	case SIOCGIFBRDADDR:	/* Get the broadcast address */
 975	case SIOCGIFDSTADDR:	/* Get the destination address */
 976	case SIOCGIFNETMASK:	/* Get the netmask for the interface */
 977		/* Note that these ioctls will not sleep,
 978		   so that we do not impose a lock.
 979		   One day we will be forced to put shlock here (I mean SMP)
 980		 */
 981		tryaddrmatch = (sin_orig.sin_family == AF_INET);
 982		memset(sin, 0, sizeof(*sin));
 983		sin->sin_family = AF_INET;
 984		break;
 985
 986	case SIOCSIFFLAGS:
 987		ret = -EPERM;
 988		if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 989			goto out;
 990		break;
 991	case SIOCSIFADDR:	/* Set interface address (and family) */
 992	case SIOCSIFBRDADDR:	/* Set the broadcast address */
 993	case SIOCSIFDSTADDR:	/* Set the destination address */
 994	case SIOCSIFNETMASK: 	/* Set the netmask for the interface */
 995		ret = -EPERM;
 996		if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 997			goto out;
 998		ret = -EINVAL;
 999		if (sin->sin_family != AF_INET)
1000			goto out;
1001		break;
1002	default:
1003		ret = -EINVAL;
1004		goto out;
1005	}
1006
1007	rtnl_lock();
1008
1009	ret = -ENODEV;
1010	dev = __dev_get_by_name(net, ifr->ifr_name);
1011	if (!dev)
1012		goto done;
1013
1014	if (colon)
1015		*colon = ':';
1016
1017	in_dev = __in_dev_get_rtnl(dev);
1018	if (in_dev) {
1019		if (tryaddrmatch) {
1020			/* Matthias Andree */
1021			/* compare label and address (4.4BSD style) */
1022			/* note: we only do this for a limited set of ioctls
1023			   and only if the original address family was AF_INET.
1024			   This is checked above. */
1025			for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
1026			     ifap = &ifa->ifa_next) {
1027				if (!strcmp(ifr->ifr_name, ifa->ifa_label) &&
1028				    sin_orig.sin_addr.s_addr ==
1029							ifa->ifa_local) {
1030					break; /* found */
1031				}
1032			}
1033		}
1034		/* we didn't get a match, maybe the application is
1035		   4.3BSD-style and passed in junk so we fall back to
1036		   comparing just the label */
1037		if (!ifa) {
1038			for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
1039			     ifap = &ifa->ifa_next)
1040				if (!strcmp(ifr->ifr_name, ifa->ifa_label))
1041					break;
1042		}
1043	}
1044
1045	ret = -EADDRNOTAVAIL;
1046	if (!ifa && cmd != SIOCSIFADDR && cmd != SIOCSIFFLAGS)
1047		goto done;
1048
1049	switch (cmd) {
1050	case SIOCGIFADDR:	/* Get interface address */
1051		ret = 0;
1052		sin->sin_addr.s_addr = ifa->ifa_local;
1053		break;
1054
1055	case SIOCGIFBRDADDR:	/* Get the broadcast address */
1056		ret = 0;
1057		sin->sin_addr.s_addr = ifa->ifa_broadcast;
1058		break;
1059
1060	case SIOCGIFDSTADDR:	/* Get the destination address */
1061		ret = 0;
1062		sin->sin_addr.s_addr = ifa->ifa_address;
1063		break;
1064
1065	case SIOCGIFNETMASK:	/* Get the netmask for the interface */
1066		ret = 0;
1067		sin->sin_addr.s_addr = ifa->ifa_mask;
1068		break;
1069
1070	case SIOCSIFFLAGS:
1071		if (colon) {
1072			ret = -EADDRNOTAVAIL;
1073			if (!ifa)
1074				break;
1075			ret = 0;
1076			if (!(ifr->ifr_flags & IFF_UP))
1077				inet_del_ifa(in_dev, ifap, 1);
1078			break;
1079		}
1080		ret = dev_change_flags(dev, ifr->ifr_flags);
1081		break;
1082
1083	case SIOCSIFADDR:	/* Set interface address (and family) */
1084		ret = -EINVAL;
1085		if (inet_abc_len(sin->sin_addr.s_addr) < 0)
1086			break;
1087
1088		if (!ifa) {
1089			ret = -ENOBUFS;
1090			ifa = inet_alloc_ifa();
 
1091			if (!ifa)
1092				break;
1093			INIT_HLIST_NODE(&ifa->hash);
1094			if (colon)
1095				memcpy(ifa->ifa_label, ifr->ifr_name, IFNAMSIZ);
1096			else
1097				memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1098		} else {
1099			ret = 0;
1100			if (ifa->ifa_local == sin->sin_addr.s_addr)
1101				break;
1102			inet_del_ifa(in_dev, ifap, 0);
1103			ifa->ifa_broadcast = 0;
1104			ifa->ifa_scope = 0;
1105		}
1106
1107		ifa->ifa_address = ifa->ifa_local = sin->sin_addr.s_addr;
1108
1109		if (!(dev->flags & IFF_POINTOPOINT)) {
1110			ifa->ifa_prefixlen = inet_abc_len(ifa->ifa_address);
1111			ifa->ifa_mask = inet_make_mask(ifa->ifa_prefixlen);
1112			if ((dev->flags & IFF_BROADCAST) &&
1113			    ifa->ifa_prefixlen < 31)
1114				ifa->ifa_broadcast = ifa->ifa_address |
1115						     ~ifa->ifa_mask;
1116		} else {
1117			ifa->ifa_prefixlen = 32;
1118			ifa->ifa_mask = inet_make_mask(32);
1119		}
1120		set_ifa_lifetime(ifa, INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1121		ret = inet_set_ifa(dev, ifa);
1122		break;
1123
1124	case SIOCSIFBRDADDR:	/* Set the broadcast address */
1125		ret = 0;
1126		if (ifa->ifa_broadcast != sin->sin_addr.s_addr) {
1127			inet_del_ifa(in_dev, ifap, 0);
1128			ifa->ifa_broadcast = sin->sin_addr.s_addr;
1129			inet_insert_ifa(ifa);
1130		}
1131		break;
1132
1133	case SIOCSIFDSTADDR:	/* Set the destination address */
1134		ret = 0;
1135		if (ifa->ifa_address == sin->sin_addr.s_addr)
1136			break;
1137		ret = -EINVAL;
1138		if (inet_abc_len(sin->sin_addr.s_addr) < 0)
1139			break;
1140		ret = 0;
1141		inet_del_ifa(in_dev, ifap, 0);
1142		ifa->ifa_address = sin->sin_addr.s_addr;
1143		inet_insert_ifa(ifa);
1144		break;
1145
1146	case SIOCSIFNETMASK: 	/* Set the netmask for the interface */
1147
1148		/*
1149		 *	The mask we set must be legal.
1150		 */
1151		ret = -EINVAL;
1152		if (bad_mask(sin->sin_addr.s_addr, 0))
1153			break;
1154		ret = 0;
1155		if (ifa->ifa_mask != sin->sin_addr.s_addr) {
1156			__be32 old_mask = ifa->ifa_mask;
1157			inet_del_ifa(in_dev, ifap, 0);
1158			ifa->ifa_mask = sin->sin_addr.s_addr;
1159			ifa->ifa_prefixlen = inet_mask_len(ifa->ifa_mask);
1160
1161			/* See if current broadcast address matches
1162			 * with current netmask, then recalculate
1163			 * the broadcast address. Otherwise it's a
1164			 * funny address, so don't touch it since
1165			 * the user seems to know what (s)he's doing...
1166			 */
1167			if ((dev->flags & IFF_BROADCAST) &&
1168			    (ifa->ifa_prefixlen < 31) &&
1169			    (ifa->ifa_broadcast ==
1170			     (ifa->ifa_local|~old_mask))) {
1171				ifa->ifa_broadcast = (ifa->ifa_local |
1172						      ~sin->sin_addr.s_addr);
1173			}
1174			inet_insert_ifa(ifa);
1175		}
1176		break;
1177	}
1178done:
1179	rtnl_unlock();
1180out:
1181	return ret;
 
 
 
 
1182}
1183
1184static int inet_gifconf(struct net_device *dev, char __user *buf, int len, int size)
1185{
1186	struct in_device *in_dev = __in_dev_get_rtnl(dev);
1187	struct in_ifaddr *ifa;
1188	struct ifreq ifr;
1189	int done = 0;
1190
1191	if (WARN_ON(size > sizeof(struct ifreq)))
1192		goto out;
1193
1194	if (!in_dev)
1195		goto out;
1196
1197	for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1198		if (!buf) {
1199			done += size;
1200			continue;
1201		}
1202		if (len < size)
1203			break;
1204		memset(&ifr, 0, sizeof(struct ifreq));
1205		strcpy(ifr.ifr_name, ifa->ifa_label);
 
 
 
1206
1207		(*(struct sockaddr_in *)&ifr.ifr_addr).sin_family = AF_INET;
1208		(*(struct sockaddr_in *)&ifr.ifr_addr).sin_addr.s_addr =
1209								ifa->ifa_local;
1210
1211		if (copy_to_user(buf + done, &ifr, size)) {
1212			done = -EFAULT;
1213			break;
1214		}
1215		len  -= size;
1216		done += size;
 
1217	}
1218out:
1219	return done;
1220}
1221
1222static __be32 in_dev_select_addr(const struct in_device *in_dev,
1223				 int scope)
1224{
1225	for_primary_ifa(in_dev) {
1226		if (ifa->ifa_scope != RT_SCOPE_LINK &&
1227		    ifa->ifa_scope <= scope)
1228			return ifa->ifa_local;
1229	} endfor_ifa(in_dev);
1230
1231	return 0;
1232}
1233
1234__be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope)
1235{
1236	__be32 addr = 0;
1237	struct in_device *in_dev;
1238	struct net *net = dev_net(dev);
1239	int master_idx;
1240
1241	rcu_read_lock();
1242	in_dev = __in_dev_get_rcu(dev);
1243	if (!in_dev)
1244		goto no_in_dev;
1245
1246	for_primary_ifa(in_dev) {
1247		if (ifa->ifa_scope > scope)
1248			continue;
1249		if (!dst || inet_ifa_match(dst, ifa)) {
1250			addr = ifa->ifa_local;
1251			break;
1252		}
1253		if (!addr)
1254			addr = ifa->ifa_local;
1255	} endfor_ifa(in_dev);
1256
1257	if (addr)
1258		goto out_unlock;
1259no_in_dev:
1260	master_idx = l3mdev_master_ifindex_rcu(dev);
1261
1262	/* For VRFs, the VRF device takes the place of the loopback device,
1263	 * with addresses on it being preferred.  Note in such cases the
1264	 * loopback device will be among the devices that fail the master_idx
1265	 * equality check in the loop below.
1266	 */
1267	if (master_idx &&
1268	    (dev = dev_get_by_index_rcu(net, master_idx)) &&
1269	    (in_dev = __in_dev_get_rcu(dev))) {
1270		addr = in_dev_select_addr(in_dev, scope);
1271		if (addr)
1272			goto out_unlock;
1273	}
1274
1275	/* Not loopback addresses on loopback should be preferred
1276	   in this case. It is important that lo is the first interface
1277	   in dev_base list.
1278	 */
1279	for_each_netdev_rcu(net, dev) {
1280		if (l3mdev_master_ifindex_rcu(dev) != master_idx)
1281			continue;
1282
1283		in_dev = __in_dev_get_rcu(dev);
1284		if (!in_dev)
1285			continue;
1286
1287		addr = in_dev_select_addr(in_dev, scope);
1288		if (addr)
1289			goto out_unlock;
 
 
 
 
1290	}
1291out_unlock:
1292	rcu_read_unlock();
1293	return addr;
1294}
1295EXPORT_SYMBOL(inet_select_addr);
1296
1297static __be32 confirm_addr_indev(struct in_device *in_dev, __be32 dst,
1298			      __be32 local, int scope)
1299{
1300	int same = 0;
1301	__be32 addr = 0;
1302
1303	for_ifa(in_dev) {
1304		if (!addr &&
1305		    (local == ifa->ifa_local || !local) &&
1306		    ifa->ifa_scope <= scope) {
1307			addr = ifa->ifa_local;
1308			if (same)
1309				break;
1310		}
1311		if (!same) {
1312			same = (!local || inet_ifa_match(local, ifa)) &&
1313				(!dst || inet_ifa_match(dst, ifa));
1314			if (same && addr) {
1315				if (local || !dst)
1316					break;
1317				/* Is the selected addr into dst subnet? */
1318				if (inet_ifa_match(addr, ifa))
1319					break;
1320				/* No, then can we use new local src? */
1321				if (ifa->ifa_scope <= scope) {
1322					addr = ifa->ifa_local;
1323					break;
1324				}
1325				/* search for large dst subnet for addr */
1326				same = 0;
1327			}
1328		}
1329	} endfor_ifa(in_dev);
1330
1331	return same ? addr : 0;
1332}
1333
1334/*
1335 * Confirm that local IP address exists using wildcards:
1336 * - net: netns to check, cannot be NULL
1337 * - in_dev: only on this interface, NULL=any interface
1338 * - dst: only in the same subnet as dst, 0=any dst
1339 * - local: address, 0=autoselect the local address
1340 * - scope: maximum allowed scope value for the local address
1341 */
1342__be32 inet_confirm_addr(struct net *net, struct in_device *in_dev,
1343			 __be32 dst, __be32 local, int scope)
1344{
1345	__be32 addr = 0;
1346	struct net_device *dev;
 
1347
1348	if (in_dev)
1349		return confirm_addr_indev(in_dev, dst, local, scope);
1350
 
1351	rcu_read_lock();
1352	for_each_netdev_rcu(net, dev) {
1353		in_dev = __in_dev_get_rcu(dev);
1354		if (in_dev) {
1355			addr = confirm_addr_indev(in_dev, dst, local, scope);
1356			if (addr)
1357				break;
1358		}
1359	}
1360	rcu_read_unlock();
1361
1362	return addr;
1363}
1364EXPORT_SYMBOL(inet_confirm_addr);
1365
1366/*
1367 *	Device notifier
1368 */
1369
1370int register_inetaddr_notifier(struct notifier_block *nb)
1371{
1372	return blocking_notifier_chain_register(&inetaddr_chain, nb);
1373}
1374EXPORT_SYMBOL(register_inetaddr_notifier);
1375
1376int unregister_inetaddr_notifier(struct notifier_block *nb)
1377{
1378	return blocking_notifier_chain_unregister(&inetaddr_chain, nb);
1379}
1380EXPORT_SYMBOL(unregister_inetaddr_notifier);
1381
1382int register_inetaddr_validator_notifier(struct notifier_block *nb)
1383{
1384	return blocking_notifier_chain_register(&inetaddr_validator_chain, nb);
1385}
1386EXPORT_SYMBOL(register_inetaddr_validator_notifier);
1387
1388int unregister_inetaddr_validator_notifier(struct notifier_block *nb)
1389{
1390	return blocking_notifier_chain_unregister(&inetaddr_validator_chain,
1391	    nb);
1392}
1393EXPORT_SYMBOL(unregister_inetaddr_validator_notifier);
1394
1395/* Rename ifa_labels for a device name change. Make some effort to preserve
1396 * existing alias numbering and to create unique labels if possible.
1397*/
1398static void inetdev_changename(struct net_device *dev, struct in_device *in_dev)
1399{
1400	struct in_ifaddr *ifa;
1401	int named = 0;
1402
1403	for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1404		char old[IFNAMSIZ], *dot;
1405
1406		memcpy(old, ifa->ifa_label, IFNAMSIZ);
1407		memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1408		if (named++ == 0)
1409			goto skip;
1410		dot = strchr(old, ':');
1411		if (!dot) {
1412			sprintf(old, ":%d", named);
1413			dot = old;
1414		}
1415		if (strlen(dot) + strlen(dev->name) < IFNAMSIZ)
1416			strcat(ifa->ifa_label, dot);
1417		else
1418			strcpy(ifa->ifa_label + (IFNAMSIZ - strlen(dot) - 1), dot);
1419skip:
1420		rtmsg_ifa(RTM_NEWADDR, ifa, NULL, 0);
1421	}
1422}
1423
1424static bool inetdev_valid_mtu(unsigned int mtu)
1425{
1426	return mtu >= IPV4_MIN_MTU;
1427}
1428
1429static void inetdev_send_gratuitous_arp(struct net_device *dev,
1430					struct in_device *in_dev)
1431
1432{
1433	struct in_ifaddr *ifa;
1434
1435	for (ifa = in_dev->ifa_list; ifa;
1436	     ifa = ifa->ifa_next) {
1437		arp_send(ARPOP_REQUEST, ETH_P_ARP,
1438			 ifa->ifa_local, dev,
1439			 ifa->ifa_local, NULL,
1440			 dev->dev_addr, NULL);
1441	}
1442}
1443
1444/* Called only under RTNL semaphore */
1445
1446static int inetdev_event(struct notifier_block *this, unsigned long event,
1447			 void *ptr)
1448{
1449	struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1450	struct in_device *in_dev = __in_dev_get_rtnl(dev);
1451
1452	ASSERT_RTNL();
1453
1454	if (!in_dev) {
1455		if (event == NETDEV_REGISTER) {
1456			in_dev = inetdev_init(dev);
1457			if (IS_ERR(in_dev))
1458				return notifier_from_errno(PTR_ERR(in_dev));
1459			if (dev->flags & IFF_LOOPBACK) {
1460				IN_DEV_CONF_SET(in_dev, NOXFRM, 1);
1461				IN_DEV_CONF_SET(in_dev, NOPOLICY, 1);
1462			}
1463		} else if (event == NETDEV_CHANGEMTU) {
1464			/* Re-enabling IP */
1465			if (inetdev_valid_mtu(dev->mtu))
1466				in_dev = inetdev_init(dev);
1467		}
1468		goto out;
1469	}
1470
1471	switch (event) {
1472	case NETDEV_REGISTER:
1473		pr_debug("%s: bug\n", __func__);
1474		RCU_INIT_POINTER(dev->ip_ptr, NULL);
1475		break;
1476	case NETDEV_UP:
1477		if (!inetdev_valid_mtu(dev->mtu))
1478			break;
1479		if (dev->flags & IFF_LOOPBACK) {
1480			struct in_ifaddr *ifa = inet_alloc_ifa();
1481
1482			if (ifa) {
1483				INIT_HLIST_NODE(&ifa->hash);
1484				ifa->ifa_local =
1485				  ifa->ifa_address = htonl(INADDR_LOOPBACK);
1486				ifa->ifa_prefixlen = 8;
1487				ifa->ifa_mask = inet_make_mask(8);
1488				in_dev_hold(in_dev);
1489				ifa->ifa_dev = in_dev;
1490				ifa->ifa_scope = RT_SCOPE_HOST;
1491				memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
1492				set_ifa_lifetime(ifa, INFINITY_LIFE_TIME,
1493						 INFINITY_LIFE_TIME);
1494				ipv4_devconf_setall(in_dev);
1495				neigh_parms_data_state_setall(in_dev->arp_parms);
1496				inet_insert_ifa(ifa);
1497			}
1498		}
1499		ip_mc_up(in_dev);
1500		/* fall through */
1501	case NETDEV_CHANGEADDR:
1502		if (!IN_DEV_ARP_NOTIFY(in_dev))
1503			break;
1504		/* fall through */
1505	case NETDEV_NOTIFY_PEERS:
1506		/* Send gratuitous ARP to notify of link change */
1507		inetdev_send_gratuitous_arp(dev, in_dev);
1508		break;
1509	case NETDEV_DOWN:
1510		ip_mc_down(in_dev);
1511		break;
1512	case NETDEV_PRE_TYPE_CHANGE:
1513		ip_mc_unmap(in_dev);
1514		break;
1515	case NETDEV_POST_TYPE_CHANGE:
1516		ip_mc_remap(in_dev);
1517		break;
1518	case NETDEV_CHANGEMTU:
1519		if (inetdev_valid_mtu(dev->mtu))
1520			break;
1521		/* disable IP when MTU is not enough */
1522		/* fall through */
1523	case NETDEV_UNREGISTER:
1524		inetdev_destroy(in_dev);
1525		break;
1526	case NETDEV_CHANGENAME:
1527		/* Do not notify about label change, this event is
1528		 * not interesting to applications using netlink.
1529		 */
1530		inetdev_changename(dev, in_dev);
1531
1532		devinet_sysctl_unregister(in_dev);
1533		devinet_sysctl_register(in_dev);
1534		break;
1535	}
1536out:
1537	return NOTIFY_DONE;
1538}
1539
1540static struct notifier_block ip_netdev_notifier = {
1541	.notifier_call = inetdev_event,
1542};
1543
1544static size_t inet_nlmsg_size(void)
1545{
1546	return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
1547	       + nla_total_size(4) /* IFA_ADDRESS */
1548	       + nla_total_size(4) /* IFA_LOCAL */
1549	       + nla_total_size(4) /* IFA_BROADCAST */
1550	       + nla_total_size(IFNAMSIZ) /* IFA_LABEL */
1551	       + nla_total_size(4)  /* IFA_FLAGS */
1552	       + nla_total_size(sizeof(struct ifa_cacheinfo)); /* IFA_CACHEINFO */
1553}
1554
1555static inline u32 cstamp_delta(unsigned long cstamp)
1556{
1557	return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
1558}
1559
1560static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
1561			 unsigned long tstamp, u32 preferred, u32 valid)
1562{
1563	struct ifa_cacheinfo ci;
1564
1565	ci.cstamp = cstamp_delta(cstamp);
1566	ci.tstamp = cstamp_delta(tstamp);
1567	ci.ifa_prefered = preferred;
1568	ci.ifa_valid = valid;
1569
1570	return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
1571}
1572
1573static int inet_fill_ifaddr(struct sk_buff *skb, struct in_ifaddr *ifa,
1574			    u32 portid, u32 seq, int event, unsigned int flags)
1575{
1576	struct ifaddrmsg *ifm;
1577	struct nlmsghdr  *nlh;
1578	u32 preferred, valid;
1579
1580	nlh = nlmsg_put(skb, portid, seq, event, sizeof(*ifm), flags);
1581	if (!nlh)
1582		return -EMSGSIZE;
1583
1584	ifm = nlmsg_data(nlh);
1585	ifm->ifa_family = AF_INET;
1586	ifm->ifa_prefixlen = ifa->ifa_prefixlen;
1587	ifm->ifa_flags = ifa->ifa_flags;
1588	ifm->ifa_scope = ifa->ifa_scope;
1589	ifm->ifa_index = ifa->ifa_dev->dev->ifindex;
1590
1591	if (!(ifm->ifa_flags & IFA_F_PERMANENT)) {
1592		preferred = ifa->ifa_preferred_lft;
1593		valid = ifa->ifa_valid_lft;
1594		if (preferred != INFINITY_LIFE_TIME) {
1595			long tval = (jiffies - ifa->ifa_tstamp) / HZ;
1596
1597			if (preferred > tval)
1598				preferred -= tval;
1599			else
1600				preferred = 0;
1601			if (valid != INFINITY_LIFE_TIME) {
1602				if (valid > tval)
1603					valid -= tval;
1604				else
1605					valid = 0;
1606			}
1607		}
1608	} else {
1609		preferred = INFINITY_LIFE_TIME;
1610		valid = INFINITY_LIFE_TIME;
1611	}
1612	if ((ifa->ifa_address &&
1613	     nla_put_in_addr(skb, IFA_ADDRESS, ifa->ifa_address)) ||
1614	    (ifa->ifa_local &&
1615	     nla_put_in_addr(skb, IFA_LOCAL, ifa->ifa_local)) ||
1616	    (ifa->ifa_broadcast &&
1617	     nla_put_in_addr(skb, IFA_BROADCAST, ifa->ifa_broadcast)) ||
1618	    (ifa->ifa_label[0] &&
1619	     nla_put_string(skb, IFA_LABEL, ifa->ifa_label)) ||
1620	    nla_put_u32(skb, IFA_FLAGS, ifa->ifa_flags) ||
1621	    put_cacheinfo(skb, ifa->ifa_cstamp, ifa->ifa_tstamp,
1622			  preferred, valid))
1623		goto nla_put_failure;
1624
1625	nlmsg_end(skb, nlh);
1626	return 0;
1627
1628nla_put_failure:
1629	nlmsg_cancel(skb, nlh);
1630	return -EMSGSIZE;
1631}
1632
1633static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
1634{
1635	struct net *net = sock_net(skb->sk);
1636	int h, s_h;
1637	int idx, s_idx;
1638	int ip_idx, s_ip_idx;
1639	struct net_device *dev;
1640	struct in_device *in_dev;
1641	struct in_ifaddr *ifa;
1642	struct hlist_head *head;
 
1643
1644	s_h = cb->args[0];
1645	s_idx = idx = cb->args[1];
1646	s_ip_idx = ip_idx = cb->args[2];
1647
1648	for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
1649		idx = 0;
1650		head = &net->dev_index_head[h];
1651		rcu_read_lock();
1652		cb->seq = atomic_read(&net->ipv4.dev_addr_genid) ^
1653			  net->dev_base_seq;
1654		hlist_for_each_entry_rcu(dev, head, index_hlist) {
1655			if (idx < s_idx)
1656				goto cont;
1657			if (h > s_h || idx > s_idx)
1658				s_ip_idx = 0;
1659			in_dev = __in_dev_get_rcu(dev);
1660			if (!in_dev)
1661				goto cont;
1662
1663			for (ifa = in_dev->ifa_list, ip_idx = 0; ifa;
1664			     ifa = ifa->ifa_next, ip_idx++) {
1665				if (ip_idx < s_ip_idx)
1666					continue;
1667				if (inet_fill_ifaddr(skb, ifa,
1668					     NETLINK_CB(cb->skb).portid,
1669					     cb->nlh->nlmsg_seq,
1670					     RTM_NEWADDR, NLM_F_MULTI) < 0) {
1671					rcu_read_unlock();
1672					goto done;
1673				}
1674				nl_dump_check_consistent(cb, nlmsg_hdr(skb));
1675			}
1676cont:
1677			idx++;
1678		}
1679		rcu_read_unlock();
1680	}
1681
1682done:
1683	cb->args[0] = h;
1684	cb->args[1] = idx;
1685	cb->args[2] = ip_idx;
1686
1687	return skb->len;
1688}
1689
1690static void rtmsg_ifa(int event, struct in_ifaddr *ifa, struct nlmsghdr *nlh,
1691		      u32 portid)
1692{
1693	struct sk_buff *skb;
1694	u32 seq = nlh ? nlh->nlmsg_seq : 0;
1695	int err = -ENOBUFS;
1696	struct net *net;
1697
1698	net = dev_net(ifa->ifa_dev->dev);
1699	skb = nlmsg_new(inet_nlmsg_size(), GFP_KERNEL);
1700	if (!skb)
1701		goto errout;
1702
1703	err = inet_fill_ifaddr(skb, ifa, portid, seq, event, 0);
1704	if (err < 0) {
1705		/* -EMSGSIZE implies BUG in inet_nlmsg_size() */
1706		WARN_ON(err == -EMSGSIZE);
1707		kfree_skb(skb);
1708		goto errout;
1709	}
1710	rtnl_notify(skb, net, portid, RTNLGRP_IPV4_IFADDR, nlh, GFP_KERNEL);
1711	return;
1712errout:
1713	if (err < 0)
1714		rtnl_set_sk_err(net, RTNLGRP_IPV4_IFADDR, err);
1715}
1716
1717static size_t inet_get_link_af_size(const struct net_device *dev,
1718				    u32 ext_filter_mask)
1719{
1720	struct in_device *in_dev = rcu_dereference_rtnl(dev->ip_ptr);
1721
1722	if (!in_dev)
1723		return 0;
1724
1725	return nla_total_size(IPV4_DEVCONF_MAX * 4); /* IFLA_INET_CONF */
1726}
1727
1728static int inet_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
1729			     u32 ext_filter_mask)
1730{
1731	struct in_device *in_dev = rcu_dereference_rtnl(dev->ip_ptr);
1732	struct nlattr *nla;
1733	int i;
1734
1735	if (!in_dev)
1736		return -ENODATA;
1737
1738	nla = nla_reserve(skb, IFLA_INET_CONF, IPV4_DEVCONF_MAX * 4);
1739	if (!nla)
1740		return -EMSGSIZE;
1741
1742	for (i = 0; i < IPV4_DEVCONF_MAX; i++)
1743		((u32 *) nla_data(nla))[i] = in_dev->cnf.data[i];
1744
1745	return 0;
1746}
1747
1748static const struct nla_policy inet_af_policy[IFLA_INET_MAX+1] = {
1749	[IFLA_INET_CONF]	= { .type = NLA_NESTED },
1750};
1751
1752static int inet_validate_link_af(const struct net_device *dev,
1753				 const struct nlattr *nla)
1754{
1755	struct nlattr *a, *tb[IFLA_INET_MAX+1];
1756	int err, rem;
1757
1758	if (dev && !__in_dev_get_rcu(dev))
1759		return -EAFNOSUPPORT;
1760
1761	err = nla_parse_nested(tb, IFLA_INET_MAX, nla, inet_af_policy, NULL);
1762	if (err < 0)
1763		return err;
1764
1765	if (tb[IFLA_INET_CONF]) {
1766		nla_for_each_nested(a, tb[IFLA_INET_CONF], rem) {
1767			int cfgid = nla_type(a);
1768
1769			if (nla_len(a) < 4)
1770				return -EINVAL;
1771
1772			if (cfgid <= 0 || cfgid > IPV4_DEVCONF_MAX)
1773				return -EINVAL;
1774		}
1775	}
1776
1777	return 0;
1778}
1779
1780static int inet_set_link_af(struct net_device *dev, const struct nlattr *nla)
1781{
1782	struct in_device *in_dev = __in_dev_get_rcu(dev);
1783	struct nlattr *a, *tb[IFLA_INET_MAX+1];
1784	int rem;
1785
1786	if (!in_dev)
1787		return -EAFNOSUPPORT;
1788
1789	if (nla_parse_nested(tb, IFLA_INET_MAX, nla, NULL, NULL) < 0)
1790		BUG();
1791
1792	if (tb[IFLA_INET_CONF]) {
1793		nla_for_each_nested(a, tb[IFLA_INET_CONF], rem)
1794			ipv4_devconf_set(in_dev, nla_type(a), nla_get_u32(a));
1795	}
1796
1797	return 0;
1798}
1799
1800static int inet_netconf_msgsize_devconf(int type)
1801{
1802	int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
1803		   + nla_total_size(4);	/* NETCONFA_IFINDEX */
1804	bool all = false;
1805
1806	if (type == NETCONFA_ALL)
1807		all = true;
1808
1809	if (all || type == NETCONFA_FORWARDING)
1810		size += nla_total_size(4);
1811	if (all || type == NETCONFA_RP_FILTER)
1812		size += nla_total_size(4);
1813	if (all || type == NETCONFA_MC_FORWARDING)
1814		size += nla_total_size(4);
1815	if (all || type == NETCONFA_PROXY_NEIGH)
1816		size += nla_total_size(4);
1817	if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
1818		size += nla_total_size(4);
1819
1820	return size;
1821}
1822
1823static int inet_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
1824				     struct ipv4_devconf *devconf, u32 portid,
1825				     u32 seq, int event, unsigned int flags,
1826				     int type)
1827{
1828	struct nlmsghdr  *nlh;
1829	struct netconfmsg *ncm;
1830	bool all = false;
1831
1832	nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
1833			flags);
1834	if (!nlh)
1835		return -EMSGSIZE;
1836
1837	if (type == NETCONFA_ALL)
1838		all = true;
1839
1840	ncm = nlmsg_data(nlh);
1841	ncm->ncm_family = AF_INET;
1842
1843	if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
1844		goto nla_put_failure;
1845
1846	if (!devconf)
1847		goto out;
1848
1849	if ((all || type == NETCONFA_FORWARDING) &&
1850	    nla_put_s32(skb, NETCONFA_FORWARDING,
1851			IPV4_DEVCONF(*devconf, FORWARDING)) < 0)
1852		goto nla_put_failure;
1853	if ((all || type == NETCONFA_RP_FILTER) &&
1854	    nla_put_s32(skb, NETCONFA_RP_FILTER,
1855			IPV4_DEVCONF(*devconf, RP_FILTER)) < 0)
1856		goto nla_put_failure;
1857	if ((all || type == NETCONFA_MC_FORWARDING) &&
1858	    nla_put_s32(skb, NETCONFA_MC_FORWARDING,
1859			IPV4_DEVCONF(*devconf, MC_FORWARDING)) < 0)
1860		goto nla_put_failure;
1861	if ((all || type == NETCONFA_PROXY_NEIGH) &&
1862	    nla_put_s32(skb, NETCONFA_PROXY_NEIGH,
1863			IPV4_DEVCONF(*devconf, PROXY_ARP)) < 0)
1864		goto nla_put_failure;
1865	if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
1866	    nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
1867			IPV4_DEVCONF(*devconf, IGNORE_ROUTES_WITH_LINKDOWN)) < 0)
1868		goto nla_put_failure;
1869
1870out:
1871	nlmsg_end(skb, nlh);
1872	return 0;
1873
1874nla_put_failure:
1875	nlmsg_cancel(skb, nlh);
1876	return -EMSGSIZE;
1877}
1878
1879void inet_netconf_notify_devconf(struct net *net, int event, int type,
1880				 int ifindex, struct ipv4_devconf *devconf)
1881{
1882	struct sk_buff *skb;
1883	int err = -ENOBUFS;
1884
1885	skb = nlmsg_new(inet_netconf_msgsize_devconf(type), GFP_KERNEL);
1886	if (!skb)
1887		goto errout;
1888
1889	err = inet_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
1890					event, 0, type);
1891	if (err < 0) {
1892		/* -EMSGSIZE implies BUG in inet_netconf_msgsize_devconf() */
1893		WARN_ON(err == -EMSGSIZE);
1894		kfree_skb(skb);
1895		goto errout;
1896	}
1897	rtnl_notify(skb, net, 0, RTNLGRP_IPV4_NETCONF, NULL, GFP_KERNEL);
1898	return;
1899errout:
1900	if (err < 0)
1901		rtnl_set_sk_err(net, RTNLGRP_IPV4_NETCONF, err);
1902}
1903
1904static const struct nla_policy devconf_ipv4_policy[NETCONFA_MAX+1] = {
1905	[NETCONFA_IFINDEX]	= { .len = sizeof(int) },
1906	[NETCONFA_FORWARDING]	= { .len = sizeof(int) },
1907	[NETCONFA_RP_FILTER]	= { .len = sizeof(int) },
1908	[NETCONFA_PROXY_NEIGH]	= { .len = sizeof(int) },
1909	[NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN]	= { .len = sizeof(int) },
1910};
1911
1912static int inet_netconf_get_devconf(struct sk_buff *in_skb,
1913				    struct nlmsghdr *nlh,
1914				    struct netlink_ext_ack *extack)
1915{
1916	struct net *net = sock_net(in_skb->sk);
1917	struct nlattr *tb[NETCONFA_MAX+1];
1918	struct netconfmsg *ncm;
1919	struct sk_buff *skb;
1920	struct ipv4_devconf *devconf;
1921	struct in_device *in_dev;
1922	struct net_device *dev;
1923	int ifindex;
1924	int err;
1925
1926	err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
1927			  devconf_ipv4_policy, extack);
1928	if (err < 0)
1929		goto errout;
1930
1931	err = -EINVAL;
1932	if (!tb[NETCONFA_IFINDEX])
1933		goto errout;
1934
1935	ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
1936	switch (ifindex) {
1937	case NETCONFA_IFINDEX_ALL:
1938		devconf = net->ipv4.devconf_all;
1939		break;
1940	case NETCONFA_IFINDEX_DEFAULT:
1941		devconf = net->ipv4.devconf_dflt;
1942		break;
1943	default:
1944		dev = __dev_get_by_index(net, ifindex);
1945		if (!dev)
1946			goto errout;
1947		in_dev = __in_dev_get_rtnl(dev);
1948		if (!in_dev)
1949			goto errout;
1950		devconf = &in_dev->cnf;
1951		break;
1952	}
1953
1954	err = -ENOBUFS;
1955	skb = nlmsg_new(inet_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL);
1956	if (!skb)
1957		goto errout;
1958
1959	err = inet_netconf_fill_devconf(skb, ifindex, devconf,
1960					NETLINK_CB(in_skb).portid,
1961					nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
1962					NETCONFA_ALL);
1963	if (err < 0) {
1964		/* -EMSGSIZE implies BUG in inet_netconf_msgsize_devconf() */
1965		WARN_ON(err == -EMSGSIZE);
1966		kfree_skb(skb);
1967		goto errout;
1968	}
1969	err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
1970errout:
1971	return err;
1972}
1973
1974static int inet_netconf_dump_devconf(struct sk_buff *skb,
1975				     struct netlink_callback *cb)
1976{
1977	struct net *net = sock_net(skb->sk);
1978	int h, s_h;
1979	int idx, s_idx;
1980	struct net_device *dev;
1981	struct in_device *in_dev;
1982	struct hlist_head *head;
1983
1984	s_h = cb->args[0];
1985	s_idx = idx = cb->args[1];
1986
1987	for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
1988		idx = 0;
1989		head = &net->dev_index_head[h];
1990		rcu_read_lock();
1991		cb->seq = atomic_read(&net->ipv4.dev_addr_genid) ^
1992			  net->dev_base_seq;
1993		hlist_for_each_entry_rcu(dev, head, index_hlist) {
1994			if (idx < s_idx)
1995				goto cont;
1996			in_dev = __in_dev_get_rcu(dev);
1997			if (!in_dev)
1998				goto cont;
1999
2000			if (inet_netconf_fill_devconf(skb, dev->ifindex,
2001						      &in_dev->cnf,
2002						      NETLINK_CB(cb->skb).portid,
2003						      cb->nlh->nlmsg_seq,
2004						      RTM_NEWNETCONF,
2005						      NLM_F_MULTI,
2006						      NETCONFA_ALL) < 0) {
2007				rcu_read_unlock();
2008				goto done;
2009			}
2010			nl_dump_check_consistent(cb, nlmsg_hdr(skb));
2011cont:
2012			idx++;
2013		}
2014		rcu_read_unlock();
2015	}
2016	if (h == NETDEV_HASHENTRIES) {
2017		if (inet_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
2018					      net->ipv4.devconf_all,
2019					      NETLINK_CB(cb->skb).portid,
2020					      cb->nlh->nlmsg_seq,
2021					      RTM_NEWNETCONF, NLM_F_MULTI,
2022					      NETCONFA_ALL) < 0)
2023			goto done;
2024		else
2025			h++;
2026	}
2027	if (h == NETDEV_HASHENTRIES + 1) {
2028		if (inet_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
2029					      net->ipv4.devconf_dflt,
2030					      NETLINK_CB(cb->skb).portid,
2031					      cb->nlh->nlmsg_seq,
2032					      RTM_NEWNETCONF, NLM_F_MULTI,
2033					      NETCONFA_ALL) < 0)
2034			goto done;
2035		else
2036			h++;
2037	}
2038done:
2039	cb->args[0] = h;
2040	cb->args[1] = idx;
2041
2042	return skb->len;
2043}
2044
2045#ifdef CONFIG_SYSCTL
2046
2047static void devinet_copy_dflt_conf(struct net *net, int i)
2048{
2049	struct net_device *dev;
2050
2051	rcu_read_lock();
2052	for_each_netdev_rcu(net, dev) {
2053		struct in_device *in_dev;
2054
2055		in_dev = __in_dev_get_rcu(dev);
2056		if (in_dev && !test_bit(i, in_dev->cnf.state))
2057			in_dev->cnf.data[i] = net->ipv4.devconf_dflt->data[i];
2058	}
2059	rcu_read_unlock();
2060}
2061
2062/* called with RTNL locked */
2063static void inet_forward_change(struct net *net)
2064{
2065	struct net_device *dev;
2066	int on = IPV4_DEVCONF_ALL(net, FORWARDING);
2067
2068	IPV4_DEVCONF_ALL(net, ACCEPT_REDIRECTS) = !on;
2069	IPV4_DEVCONF_DFLT(net, FORWARDING) = on;
2070	inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
2071				    NETCONFA_FORWARDING,
2072				    NETCONFA_IFINDEX_ALL,
2073				    net->ipv4.devconf_all);
2074	inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
2075				    NETCONFA_FORWARDING,
2076				    NETCONFA_IFINDEX_DEFAULT,
2077				    net->ipv4.devconf_dflt);
2078
2079	for_each_netdev(net, dev) {
2080		struct in_device *in_dev;
2081
2082		if (on)
2083			dev_disable_lro(dev);
2084
2085		in_dev = __in_dev_get_rtnl(dev);
2086		if (in_dev) {
2087			IN_DEV_CONF_SET(in_dev, FORWARDING, on);
2088			inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
2089						    NETCONFA_FORWARDING,
2090						    dev->ifindex, &in_dev->cnf);
2091		}
2092	}
2093}
2094
2095static int devinet_conf_ifindex(struct net *net, struct ipv4_devconf *cnf)
2096{
2097	if (cnf == net->ipv4.devconf_dflt)
2098		return NETCONFA_IFINDEX_DEFAULT;
2099	else if (cnf == net->ipv4.devconf_all)
2100		return NETCONFA_IFINDEX_ALL;
2101	else {
2102		struct in_device *idev
2103			= container_of(cnf, struct in_device, cnf);
2104		return idev->dev->ifindex;
2105	}
2106}
2107
2108static int devinet_conf_proc(struct ctl_table *ctl, int write,
2109			     void __user *buffer,
2110			     size_t *lenp, loff_t *ppos)
2111{
2112	int old_value = *(int *)ctl->data;
2113	int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
2114	int new_value = *(int *)ctl->data;
2115
2116	if (write) {
2117		struct ipv4_devconf *cnf = ctl->extra1;
2118		struct net *net = ctl->extra2;
2119		int i = (int *)ctl->data - cnf->data;
2120		int ifindex;
2121
2122		set_bit(i, cnf->state);
2123
2124		if (cnf == net->ipv4.devconf_dflt)
2125			devinet_copy_dflt_conf(net, i);
2126		if (i == IPV4_DEVCONF_ACCEPT_LOCAL - 1 ||
2127		    i == IPV4_DEVCONF_ROUTE_LOCALNET - 1)
2128			if ((new_value == 0) && (old_value != 0))
2129				rt_cache_flush(net);
2130
2131		if (i == IPV4_DEVCONF_RP_FILTER - 1 &&
2132		    new_value != old_value) {
2133			ifindex = devinet_conf_ifindex(net, cnf);
2134			inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
2135						    NETCONFA_RP_FILTER,
2136						    ifindex, cnf);
2137		}
2138		if (i == IPV4_DEVCONF_PROXY_ARP - 1 &&
2139		    new_value != old_value) {
2140			ifindex = devinet_conf_ifindex(net, cnf);
2141			inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
2142						    NETCONFA_PROXY_NEIGH,
2143						    ifindex, cnf);
2144		}
2145		if (i == IPV4_DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN - 1 &&
2146		    new_value != old_value) {
2147			ifindex = devinet_conf_ifindex(net, cnf);
2148			inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
2149						    NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
2150						    ifindex, cnf);
2151		}
2152	}
2153
2154	return ret;
2155}
2156
2157static int devinet_sysctl_forward(struct ctl_table *ctl, int write,
2158				  void __user *buffer,
2159				  size_t *lenp, loff_t *ppos)
2160{
2161	int *valp = ctl->data;
2162	int val = *valp;
2163	loff_t pos = *ppos;
2164	int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
2165
2166	if (write && *valp != val) {
2167		struct net *net = ctl->extra2;
2168
2169		if (valp != &IPV4_DEVCONF_DFLT(net, FORWARDING)) {
2170			if (!rtnl_trylock()) {
2171				/* Restore the original values before restarting */
2172				*valp = val;
2173				*ppos = pos;
2174				return restart_syscall();
2175			}
2176			if (valp == &IPV4_DEVCONF_ALL(net, FORWARDING)) {
2177				inet_forward_change(net);
2178			} else {
2179				struct ipv4_devconf *cnf = ctl->extra1;
2180				struct in_device *idev =
2181					container_of(cnf, struct in_device, cnf);
2182				if (*valp)
2183					dev_disable_lro(idev->dev);
2184				inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
2185							    NETCONFA_FORWARDING,
2186							    idev->dev->ifindex,
2187							    cnf);
2188			}
2189			rtnl_unlock();
2190			rt_cache_flush(net);
2191		} else
2192			inet_netconf_notify_devconf(net, RTM_NEWNETCONF,
2193						    NETCONFA_FORWARDING,
2194						    NETCONFA_IFINDEX_DEFAULT,
2195						    net->ipv4.devconf_dflt);
2196	}
2197
2198	return ret;
2199}
2200
2201static int ipv4_doint_and_flush(struct ctl_table *ctl, int write,
2202				void __user *buffer,
2203				size_t *lenp, loff_t *ppos)
2204{
2205	int *valp = ctl->data;
2206	int val = *valp;
2207	int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
2208	struct net *net = ctl->extra2;
2209
2210	if (write && *valp != val)
2211		rt_cache_flush(net);
2212
2213	return ret;
2214}
2215
2216#define DEVINET_SYSCTL_ENTRY(attr, name, mval, proc) \
2217	{ \
2218		.procname	= name, \
2219		.data		= ipv4_devconf.data + \
2220				  IPV4_DEVCONF_ ## attr - 1, \
2221		.maxlen		= sizeof(int), \
2222		.mode		= mval, \
2223		.proc_handler	= proc, \
2224		.extra1		= &ipv4_devconf, \
2225	}
2226
2227#define DEVINET_SYSCTL_RW_ENTRY(attr, name) \
2228	DEVINET_SYSCTL_ENTRY(attr, name, 0644, devinet_conf_proc)
2229
2230#define DEVINET_SYSCTL_RO_ENTRY(attr, name) \
2231	DEVINET_SYSCTL_ENTRY(attr, name, 0444, devinet_conf_proc)
2232
2233#define DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, proc) \
2234	DEVINET_SYSCTL_ENTRY(attr, name, 0644, proc)
2235
2236#define DEVINET_SYSCTL_FLUSHING_ENTRY(attr, name) \
2237	DEVINET_SYSCTL_COMPLEX_ENTRY(attr, name, ipv4_doint_and_flush)
2238
2239static struct devinet_sysctl_table {
2240	struct ctl_table_header *sysctl_header;
2241	struct ctl_table devinet_vars[__IPV4_DEVCONF_MAX];
2242} devinet_sysctl = {
2243	.devinet_vars = {
2244		DEVINET_SYSCTL_COMPLEX_ENTRY(FORWARDING, "forwarding",
2245					     devinet_sysctl_forward),
2246		DEVINET_SYSCTL_RO_ENTRY(MC_FORWARDING, "mc_forwarding"),
2247
2248		DEVINET_SYSCTL_RW_ENTRY(ACCEPT_REDIRECTS, "accept_redirects"),
2249		DEVINET_SYSCTL_RW_ENTRY(SECURE_REDIRECTS, "secure_redirects"),
2250		DEVINET_SYSCTL_RW_ENTRY(SHARED_MEDIA, "shared_media"),
2251		DEVINET_SYSCTL_RW_ENTRY(RP_FILTER, "rp_filter"),
2252		DEVINET_SYSCTL_RW_ENTRY(SEND_REDIRECTS, "send_redirects"),
2253		DEVINET_SYSCTL_RW_ENTRY(ACCEPT_SOURCE_ROUTE,
2254					"accept_source_route"),
2255		DEVINET_SYSCTL_RW_ENTRY(ACCEPT_LOCAL, "accept_local"),
2256		DEVINET_SYSCTL_RW_ENTRY(SRC_VMARK, "src_valid_mark"),
2257		DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP, "proxy_arp"),
2258		DEVINET_SYSCTL_RW_ENTRY(MEDIUM_ID, "medium_id"),
2259		DEVINET_SYSCTL_RW_ENTRY(BOOTP_RELAY, "bootp_relay"),
2260		DEVINET_SYSCTL_RW_ENTRY(LOG_MARTIANS, "log_martians"),
2261		DEVINET_SYSCTL_RW_ENTRY(TAG, "tag"),
2262		DEVINET_SYSCTL_RW_ENTRY(ARPFILTER, "arp_filter"),
2263		DEVINET_SYSCTL_RW_ENTRY(ARP_ANNOUNCE, "arp_announce"),
2264		DEVINET_SYSCTL_RW_ENTRY(ARP_IGNORE, "arp_ignore"),
2265		DEVINET_SYSCTL_RW_ENTRY(ARP_ACCEPT, "arp_accept"),
2266		DEVINET_SYSCTL_RW_ENTRY(ARP_NOTIFY, "arp_notify"),
2267		DEVINET_SYSCTL_RW_ENTRY(PROXY_ARP_PVLAN, "proxy_arp_pvlan"),
2268		DEVINET_SYSCTL_RW_ENTRY(FORCE_IGMP_VERSION,
2269					"force_igmp_version"),
2270		DEVINET_SYSCTL_RW_ENTRY(IGMPV2_UNSOLICITED_REPORT_INTERVAL,
2271					"igmpv2_unsolicited_report_interval"),
2272		DEVINET_SYSCTL_RW_ENTRY(IGMPV3_UNSOLICITED_REPORT_INTERVAL,
2273					"igmpv3_unsolicited_report_interval"),
2274		DEVINET_SYSCTL_RW_ENTRY(IGNORE_ROUTES_WITH_LINKDOWN,
2275					"ignore_routes_with_linkdown"),
2276		DEVINET_SYSCTL_RW_ENTRY(DROP_GRATUITOUS_ARP,
2277					"drop_gratuitous_arp"),
2278
2279		DEVINET_SYSCTL_FLUSHING_ENTRY(NOXFRM, "disable_xfrm"),
2280		DEVINET_SYSCTL_FLUSHING_ENTRY(NOPOLICY, "disable_policy"),
 
 
2281		DEVINET_SYSCTL_FLUSHING_ENTRY(PROMOTE_SECONDARIES,
2282					      "promote_secondaries"),
2283		DEVINET_SYSCTL_FLUSHING_ENTRY(ROUTE_LOCALNET,
2284					      "route_localnet"),
2285		DEVINET_SYSCTL_FLUSHING_ENTRY(DROP_UNICAST_IN_L2_MULTICAST,
2286					      "drop_unicast_in_l2_multicast"),
2287	},
2288};
2289
2290static int __devinet_sysctl_register(struct net *net, char *dev_name,
2291				     int ifindex, struct ipv4_devconf *p)
2292{
2293	int i;
2294	struct devinet_sysctl_table *t;
2295	char path[sizeof("net/ipv4/conf/") + IFNAMSIZ];
2296
2297	t = kmemdup(&devinet_sysctl, sizeof(*t), GFP_KERNEL);
2298	if (!t)
2299		goto out;
2300
2301	for (i = 0; i < ARRAY_SIZE(t->devinet_vars) - 1; i++) {
2302		t->devinet_vars[i].data += (char *)p - (char *)&ipv4_devconf;
2303		t->devinet_vars[i].extra1 = p;
2304		t->devinet_vars[i].extra2 = net;
2305	}
2306
2307	snprintf(path, sizeof(path), "net/ipv4/conf/%s", dev_name);
2308
2309	t->sysctl_header = register_net_sysctl(net, path, t->devinet_vars);
2310	if (!t->sysctl_header)
2311		goto free;
2312
2313	p->sysctl = t;
2314
2315	inet_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL,
2316				    ifindex, p);
2317	return 0;
2318
2319free:
2320	kfree(t);
2321out:
2322	return -ENOBUFS;
2323}
2324
2325static void __devinet_sysctl_unregister(struct net *net,
2326					struct ipv4_devconf *cnf, int ifindex)
2327{
2328	struct devinet_sysctl_table *t = cnf->sysctl;
2329
2330	if (t) {
2331		cnf->sysctl = NULL;
2332		unregister_net_sysctl_table(t->sysctl_header);
2333		kfree(t);
2334	}
2335
2336	inet_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL);
 
 
2337}
2338
2339static int devinet_sysctl_register(struct in_device *idev)
2340{
2341	int err;
2342
2343	if (!sysctl_dev_name_is_allowed(idev->dev->name))
2344		return -EINVAL;
2345
2346	err = neigh_sysctl_register(idev->dev, idev->arp_parms, NULL);
2347	if (err)
2348		return err;
2349	err = __devinet_sysctl_register(dev_net(idev->dev), idev->dev->name,
2350					idev->dev->ifindex, &idev->cnf);
2351	if (err)
2352		neigh_sysctl_unregister(idev->arp_parms);
2353	return err;
2354}
2355
2356static void devinet_sysctl_unregister(struct in_device *idev)
2357{
2358	struct net *net = dev_net(idev->dev);
2359
2360	__devinet_sysctl_unregister(net, &idev->cnf, idev->dev->ifindex);
2361	neigh_sysctl_unregister(idev->arp_parms);
2362}
2363
2364static struct ctl_table ctl_forward_entry[] = {
2365	{
2366		.procname	= "ip_forward",
2367		.data		= &ipv4_devconf.data[
2368					IPV4_DEVCONF_FORWARDING - 1],
2369		.maxlen		= sizeof(int),
2370		.mode		= 0644,
2371		.proc_handler	= devinet_sysctl_forward,
2372		.extra1		= &ipv4_devconf,
2373		.extra2		= &init_net,
2374	},
2375	{ },
2376};
2377#endif
2378
2379static __net_init int devinet_init_net(struct net *net)
2380{
2381	int err;
2382	struct ipv4_devconf *all, *dflt;
2383#ifdef CONFIG_SYSCTL
2384	struct ctl_table *tbl = ctl_forward_entry;
2385	struct ctl_table_header *forw_hdr;
2386#endif
2387
2388	err = -ENOMEM;
2389	all = &ipv4_devconf;
2390	dflt = &ipv4_devconf_dflt;
2391
2392	if (!net_eq(net, &init_net)) {
2393		all = kmemdup(all, sizeof(ipv4_devconf), GFP_KERNEL);
2394		if (!all)
2395			goto err_alloc_all;
2396
2397		dflt = kmemdup(dflt, sizeof(ipv4_devconf_dflt), GFP_KERNEL);
2398		if (!dflt)
2399			goto err_alloc_dflt;
2400
2401#ifdef CONFIG_SYSCTL
2402		tbl = kmemdup(tbl, sizeof(ctl_forward_entry), GFP_KERNEL);
2403		if (!tbl)
2404			goto err_alloc_ctl;
2405
2406		tbl[0].data = &all->data[IPV4_DEVCONF_FORWARDING - 1];
2407		tbl[0].extra1 = all;
2408		tbl[0].extra2 = net;
2409#endif
2410	}
2411
2412#ifdef CONFIG_SYSCTL
2413	err = __devinet_sysctl_register(net, "all", NETCONFA_IFINDEX_ALL, all);
2414	if (err < 0)
2415		goto err_reg_all;
2416
2417	err = __devinet_sysctl_register(net, "default",
2418					NETCONFA_IFINDEX_DEFAULT, dflt);
2419	if (err < 0)
2420		goto err_reg_dflt;
2421
2422	err = -ENOMEM;
2423	forw_hdr = register_net_sysctl(net, "net/ipv4", tbl);
2424	if (!forw_hdr)
2425		goto err_reg_ctl;
2426	net->ipv4.forw_hdr = forw_hdr;
2427#endif
2428
2429	net->ipv4.devconf_all = all;
2430	net->ipv4.devconf_dflt = dflt;
2431	return 0;
2432
2433#ifdef CONFIG_SYSCTL
2434err_reg_ctl:
2435	__devinet_sysctl_unregister(net, dflt, NETCONFA_IFINDEX_DEFAULT);
2436err_reg_dflt:
2437	__devinet_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL);
2438err_reg_all:
2439	if (tbl != ctl_forward_entry)
2440		kfree(tbl);
2441err_alloc_ctl:
2442#endif
2443	if (dflt != &ipv4_devconf_dflt)
2444		kfree(dflt);
2445err_alloc_dflt:
2446	if (all != &ipv4_devconf)
2447		kfree(all);
2448err_alloc_all:
2449	return err;
2450}
2451
2452static __net_exit void devinet_exit_net(struct net *net)
2453{
2454#ifdef CONFIG_SYSCTL
2455	struct ctl_table *tbl;
2456
2457	tbl = net->ipv4.forw_hdr->ctl_table_arg;
2458	unregister_net_sysctl_table(net->ipv4.forw_hdr);
2459	__devinet_sysctl_unregister(net, net->ipv4.devconf_dflt,
2460				    NETCONFA_IFINDEX_DEFAULT);
2461	__devinet_sysctl_unregister(net, net->ipv4.devconf_all,
2462				    NETCONFA_IFINDEX_ALL);
2463	kfree(tbl);
2464#endif
2465	kfree(net->ipv4.devconf_dflt);
2466	kfree(net->ipv4.devconf_all);
2467}
2468
2469static __net_initdata struct pernet_operations devinet_ops = {
2470	.init = devinet_init_net,
2471	.exit = devinet_exit_net,
2472};
2473
2474static struct rtnl_af_ops inet_af_ops __read_mostly = {
2475	.family		  = AF_INET,
2476	.fill_link_af	  = inet_fill_link_af,
2477	.get_link_af_size = inet_get_link_af_size,
2478	.validate_link_af = inet_validate_link_af,
2479	.set_link_af	  = inet_set_link_af,
2480};
2481
2482void __init devinet_init(void)
2483{
2484	int i;
2485
2486	for (i = 0; i < IN4_ADDR_HSIZE; i++)
2487		INIT_HLIST_HEAD(&inet_addr_lst[i]);
2488
2489	register_pernet_subsys(&devinet_ops);
2490
2491	register_gifconf(PF_INET, inet_gifconf);
2492	register_netdevice_notifier(&ip_netdev_notifier);
2493
2494	queue_delayed_work(system_power_efficient_wq, &check_lifetime_work, 0);
2495
2496	rtnl_af_register(&inet_af_ops);
2497
2498	rtnl_register(PF_INET, RTM_NEWADDR, inet_rtm_newaddr, NULL, 0);
2499	rtnl_register(PF_INET, RTM_DELADDR, inet_rtm_deladdr, NULL, 0);
2500	rtnl_register(PF_INET, RTM_GETADDR, NULL, inet_dump_ifaddr, 0);
2501	rtnl_register(PF_INET, RTM_GETNETCONF, inet_netconf_get_devconf,
2502		      inet_netconf_dump_devconf, 0);
2503}