1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 * INET		An implementation of the TCP/IP protocol suite for the LINUX
   4 *		operating system.  INET is implemented using the  BSD Socket
   5 *		interface as the means of communication with the user level.
   6 *
   7 *		PF_INET protocol family socket handler.
   8 *
   9 * Authors:	Ross Biro
  10 *		Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
  11 *		Florian La Roche, <flla@stud.uni-sb.de>
  12 *		Alan Cox, <A.Cox@swansea.ac.uk>
  13 *
  14 * Changes (see also sock.c)
  15 *
  16 *		piggy,
  17 *		Karl Knutson	:	Socket protocol table
  18 *		A.N.Kuznetsov	:	Socket death error in accept().
  19 *		John Richardson :	Fix non blocking error in connect()
  20 *					so sockets that fail to connect
  21 *					don't return -EINPROGRESS.
  22 *		Alan Cox	:	Asynchronous I/O support
  23 *		Alan Cox	:	Keep correct socket pointer on sock
  24 *					structures
  25 *					when accept() ed
  26 *		Alan Cox	:	Semantics of SO_LINGER aren't state
  27 *					moved to close when you look carefully.
  28 *					With this fixed and the accept bug fixed
  29 *					some RPC stuff seems happier.
  30 *		Niibe Yutaka	:	4.4BSD style write async I/O
  31 *		Alan Cox,
  32 *		Tony Gale 	:	Fixed reuse semantics.
  33 *		Alan Cox	:	bind() shouldn't abort existing but dead
  34 *					sockets. Stops FTP netin:.. I hope.
  35 *		Alan Cox	:	bind() works correctly for RAW sockets.
  36 *					Note that FreeBSD at least was broken
  37 *					in this respect so be careful with
  38 *					compatibility tests...
  39 *		Alan Cox	:	routing cache support
  40 *		Alan Cox	:	memzero the socket structure for
  41 *					compactness.
  42 *		Matt Day	:	nonblock connect error handler
  43 *		Alan Cox	:	Allow large numbers of pending sockets
  44 *					(eg for big web sites), but only if
  45 *					specifically application requested.
  46 *		Alan Cox	:	New buffering throughout IP. Used
  47 *					dumbly.
  48 *		Alan Cox	:	New buffering now used smartly.
  49 *		Alan Cox	:	BSD rather than common sense
  50 *					interpretation of listen.
  51 *		Germano Caronni	:	Assorted small races.
  52 *		Alan Cox	:	sendmsg/recvmsg basic support.
  53 *		Alan Cox	:	Only sendmsg/recvmsg now supported.
  54 *		Alan Cox	:	Locked down bind (see security list).
  55 *		Alan Cox	:	Loosened bind a little.
  56 *		Mike McLagan	:	ADD/DEL DLCI Ioctls
  57 *	Willy Konynenberg	:	Transparent proxying support.
  58 *		David S. Miller	:	New socket lookup architecture.
  59 *					Some other random speedups.
  60 *		Cyrus Durgin	:	Cleaned up file for kmod hacks.
  61 *		Andi Kleen	:	Fix inet_stream_connect TCP race.
  62 */
  63
  64#define pr_fmt(fmt) "IPv4: " fmt
  65
  66#include <linux/err.h>
  67#include <linux/errno.h>
  68#include <linux/types.h>
  69#include <linux/socket.h>
  70#include <linux/in.h>
  71#include <linux/kernel.h>
  72#include <linux/kmod.h>
  73#include <linux/sched.h>
  74#include <linux/timer.h>
  75#include <linux/string.h>
  76#include <linux/sockios.h>
  77#include <linux/net.h>
  78#include <linux/capability.h>
  79#include <linux/fcntl.h>
  80#include <linux/mm.h>
  81#include <linux/interrupt.h>
  82#include <linux/stat.h>
  83#include <linux/init.h>
  84#include <linux/poll.h>
  85#include <linux/netfilter_ipv4.h>
  86#include <linux/random.h>
  87#include <linux/slab.h>
  88
  89#include <linux/uaccess.h>
  90
  91#include <linux/inet.h>
  92#include <linux/igmp.h>
  93#include <linux/inetdevice.h>
  94#include <linux/netdevice.h>
  95#include <net/checksum.h>
  96#include <net/ip.h>
  97#include <net/protocol.h>
  98#include <net/arp.h>
  99#include <net/route.h>
 100#include <net/ip_fib.h>
 101#include <net/inet_connection_sock.h>
 102#include <net/gro.h>
 103#include <net/gso.h>
 104#include <net/tcp.h>
 105#include <net/udp.h>
 106#include <net/udplite.h>
 107#include <net/ping.h>
 108#include <linux/skbuff.h>
 109#include <net/sock.h>
 110#include <net/raw.h>
 111#include <net/icmp.h>
 112#include <net/inet_common.h>
 113#include <net/ip_tunnels.h>
 114#include <net/xfrm.h>
 115#include <net/net_namespace.h>
 116#include <net/secure_seq.h>
 117#ifdef CONFIG_IP_MROUTE
 118#include <linux/mroute.h>
 119#endif
 120#include <net/l3mdev.h>
 121#include <net/compat.h>
 122#include <net/rps.h>
 123
 124#include <trace/events/sock.h>
 125
 126/* The inetsw table contains everything that inet_create needs to
 127 * build a new socket.
 128 */
 129static struct list_head inetsw[SOCK_MAX];
 130static DEFINE_SPINLOCK(inetsw_lock);
 131
 132/* New destruction routine */
 133
 134void inet_sock_destruct(struct sock *sk)
 135{
 136	struct inet_sock *inet = inet_sk(sk);
 137
 138	__skb_queue_purge(&sk->sk_receive_queue);
 
 
 
 
 139	__skb_queue_purge(&sk->sk_error_queue);
 140
 141	sk_mem_reclaim_final(sk);
 142
 143	if (sk->sk_type == SOCK_STREAM && sk->sk_state != TCP_CLOSE) {
 144		pr_err("Attempt to release TCP socket in state %d %p\n",
 145		       sk->sk_state, sk);
 146		return;
 147	}
 148	if (!sock_flag(sk, SOCK_DEAD)) {
 149		pr_err("Attempt to release alive inet socket %p\n", sk);
 150		return;
 151	}
 152
 153	WARN_ON_ONCE(atomic_read(&sk->sk_rmem_alloc));
 154	WARN_ON_ONCE(refcount_read(&sk->sk_wmem_alloc));
 155	WARN_ON_ONCE(sk->sk_wmem_queued);
 156	WARN_ON_ONCE(sk_forward_alloc_get(sk));
 157
 158	kfree(rcu_dereference_protected(inet->inet_opt, 1));
 159	dst_release(rcu_dereference_protected(sk->sk_dst_cache, 1));
 160	dst_release(rcu_dereference_protected(sk->sk_rx_dst, 1));
 
 161}
 162EXPORT_SYMBOL(inet_sock_destruct);
 163
 164/*
 165 *	The routines beyond this point handle the behaviour of an AF_INET
 166 *	socket object. Mostly it punts to the subprotocols of IP to do
 167 *	the work.
 168 */
 169
 170/*
 171 *	Automatically bind an unbound socket.
 172 */
 173
 174static int inet_autobind(struct sock *sk)
 175{
 176	struct inet_sock *inet;
 177	/* We may need to bind the socket. */
 178	lock_sock(sk);
 179	inet = inet_sk(sk);
 180	if (!inet->inet_num) {
 181		if (sk->sk_prot->get_port(sk, 0)) {
 182			release_sock(sk);
 183			return -EAGAIN;
 184		}
 185		inet->inet_sport = htons(inet->inet_num);
 186	}
 187	release_sock(sk);
 188	return 0;
 189}
 190
 191int __inet_listen_sk(struct sock *sk, int backlog)
 
 
 
 192{
 193	unsigned char old_state = sk->sk_state;
 
 194	int err, tcp_fastopen;
 195
 
 
 
 
 
 
 
 196	if (!((1 << old_state) & (TCPF_CLOSE | TCPF_LISTEN)))
 197		return -EINVAL;
 198
 199	WRITE_ONCE(sk->sk_max_ack_backlog, backlog);
 200	/* Really, if the socket is already in listen state
 201	 * we can only allow the backlog to be adjusted.
 202	 */
 203	if (old_state != TCP_LISTEN) {
 204		/* Enable TFO w/o requiring TCP_FASTOPEN socket option.
 205		 * Note that only TCP sockets (SOCK_STREAM) will reach here.
 206		 * Also fastopen backlog may already been set via the option
 207		 * because the socket was in TCP_LISTEN state previously but
 208		 * was shutdown() rather than close().
 209		 */
 210		tcp_fastopen = READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_fastopen);
 211		if ((tcp_fastopen & TFO_SERVER_WO_SOCKOPT1) &&
 212		    (tcp_fastopen & TFO_SERVER_ENABLE) &&
 213		    !inet_csk(sk)->icsk_accept_queue.fastopenq.max_qlen) {
 214			fastopen_queue_tune(sk, backlog);
 215			tcp_fastopen_init_key_once(sock_net(sk));
 216		}
 217
 218		err = inet_csk_listen_start(sk);
 219		if (err)
 220			return err;
 221
 222		tcp_call_bpf(sk, BPF_SOCK_OPS_TCP_LISTEN_CB, 0, NULL);
 223	}
 224	return 0;
 225}
 226
 227/*
 228 *	Move a socket into listening state.
 229 */
 230int inet_listen(struct socket *sock, int backlog)
 231{
 232	struct sock *sk = sock->sk;
 233	int err = -EINVAL;
 234
 235	lock_sock(sk);
 236
 237	if (sock->state != SS_UNCONNECTED || sock->type != SOCK_STREAM)
 238		goto out;
 239
 240	err = __inet_listen_sk(sk, backlog);
 241
 242out:
 243	release_sock(sk);
 244	return err;
 245}
 246EXPORT_SYMBOL(inet_listen);
 247
 248/*
 249 *	Create an inet socket.
 250 */
 251
 252static int inet_create(struct net *net, struct socket *sock, int protocol,
 253		       int kern)
 254{
 255	struct sock *sk;
 256	struct inet_protosw *answer;
 257	struct inet_sock *inet;
 258	struct proto *answer_prot;
 259	unsigned char answer_flags;
 260	int try_loading_module = 0;
 261	int err;
 262
 263	if (protocol < 0 || protocol >= IPPROTO_MAX)
 264		return -EINVAL;
 265
 266	sock->state = SS_UNCONNECTED;
 267
 268	/* Look for the requested type/protocol pair. */
 269lookup_protocol:
 270	err = -ESOCKTNOSUPPORT;
 271	rcu_read_lock();
 272	list_for_each_entry_rcu(answer, &inetsw[sock->type], list) {
 273
 274		err = 0;
 275		/* Check the non-wild match. */
 276		if (protocol == answer->protocol) {
 277			if (protocol != IPPROTO_IP)
 278				break;
 279		} else {
 280			/* Check for the two wild cases. */
 281			if (IPPROTO_IP == protocol) {
 282				protocol = answer->protocol;
 283				break;
 284			}
 285			if (IPPROTO_IP == answer->protocol)
 286				break;
 287		}
 288		err = -EPROTONOSUPPORT;
 289	}
 290
 291	if (unlikely(err)) {
 292		if (try_loading_module < 2) {
 293			rcu_read_unlock();
 294			/*
 295			 * Be more specific, e.g. net-pf-2-proto-132-type-1
 296			 * (net-pf-PF_INET-proto-IPPROTO_SCTP-type-SOCK_STREAM)
 297			 */
 298			if (++try_loading_module == 1)
 299				request_module("net-pf-%d-proto-%d-type-%d",
 300					       PF_INET, protocol, sock->type);
 301			/*
 302			 * Fall back to generic, e.g. net-pf-2-proto-132
 303			 * (net-pf-PF_INET-proto-IPPROTO_SCTP)
 304			 */
 305			else
 306				request_module("net-pf-%d-proto-%d",
 307					       PF_INET, protocol);
 308			goto lookup_protocol;
 309		} else
 310			goto out_rcu_unlock;
 311	}
 312
 313	err = -EPERM;
 314	if (sock->type == SOCK_RAW && !kern &&
 315	    !ns_capable(net->user_ns, CAP_NET_RAW))
 316		goto out_rcu_unlock;
 317
 318	sock->ops = answer->ops;
 319	answer_prot = answer->prot;
 320	answer_flags = answer->flags;
 321	rcu_read_unlock();
 322
 323	WARN_ON(!answer_prot->slab);
 324
 325	err = -ENOMEM;
 326	sk = sk_alloc(net, PF_INET, GFP_KERNEL, answer_prot, kern);
 327	if (!sk)
 328		goto out;
 329
 330	err = 0;
 331	if (INET_PROTOSW_REUSE & answer_flags)
 332		sk->sk_reuse = SK_CAN_REUSE;
 333
 334	if (INET_PROTOSW_ICSK & answer_flags)
 335		inet_init_csk_locks(sk);
 336
 337	inet = inet_sk(sk);
 338	inet_assign_bit(IS_ICSK, sk, INET_PROTOSW_ICSK & answer_flags);
 339
 340	inet_clear_bit(NODEFRAG, sk);
 341
 342	if (SOCK_RAW == sock->type) {
 343		inet->inet_num = protocol;
 344		if (IPPROTO_RAW == protocol)
 345			inet_set_bit(HDRINCL, sk);
 346	}
 347
 348	if (READ_ONCE(net->ipv4.sysctl_ip_no_pmtu_disc))
 349		inet->pmtudisc = IP_PMTUDISC_DONT;
 350	else
 351		inet->pmtudisc = IP_PMTUDISC_WANT;
 352
 353	atomic_set(&inet->inet_id, 0);
 354
 355	sock_init_data(sock, sk);
 356
 357	sk->sk_destruct	   = inet_sock_destruct;
 358	sk->sk_protocol	   = protocol;
 359	sk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
 360	sk->sk_txrehash = READ_ONCE(net->core.sysctl_txrehash);
 361
 362	inet->uc_ttl	= -1;
 363	inet_set_bit(MC_LOOP, sk);
 364	inet->mc_ttl	= 1;
 365	inet_set_bit(MC_ALL, sk);
 366	inet->mc_index	= 0;
 367	inet->mc_list	= NULL;
 368	inet->rcv_tos	= 0;
 369
 
 
 370	if (inet->inet_num) {
 371		/* It assumes that any protocol which allows
 372		 * the user to assign a number at socket
 373		 * creation time automatically
 374		 * shares.
 375		 */
 376		inet->inet_sport = htons(inet->inet_num);
 377		/* Add to protocol hash chains. */
 378		err = sk->sk_prot->hash(sk);
 379		if (err) {
 380			sk_common_release(sk);
 381			goto out;
 382		}
 383	}
 384
 385	if (sk->sk_prot->init) {
 386		err = sk->sk_prot->init(sk);
 387		if (err) {
 388			sk_common_release(sk);
 389			goto out;
 390		}
 391	}
 392
 393	if (!kern) {
 394		err = BPF_CGROUP_RUN_PROG_INET_SOCK(sk);
 395		if (err) {
 396			sk_common_release(sk);
 397			goto out;
 398		}
 399	}
 400out:
 401	return err;
 402out_rcu_unlock:
 403	rcu_read_unlock();
 404	goto out;
 405}
 406
 407
 408/*
 409 *	The peer socket should always be NULL (or else). When we call this
 410 *	function we are destroying the object and from then on nobody
 411 *	should refer to it.
 412 */
 413int inet_release(struct socket *sock)
 414{
 415	struct sock *sk = sock->sk;
 416
 417	if (sk) {
 418		long timeout;
 419
 420		if (!sk->sk_kern_sock)
 421			BPF_CGROUP_RUN_PROG_INET_SOCK_RELEASE(sk);
 422
 423		/* Applications forget to leave groups before exiting */
 424		ip_mc_drop_socket(sk);
 425
 426		/* If linger is set, we don't return until the close
 427		 * is complete.  Otherwise we return immediately. The
 428		 * actually closing is done the same either way.
 429		 *
 430		 * If the close is due to the process exiting, we never
 431		 * linger..
 432		 */
 433		timeout = 0;
 434		if (sock_flag(sk, SOCK_LINGER) &&
 435		    !(current->flags & PF_EXITING))
 436			timeout = sk->sk_lingertime;
 437		sk->sk_prot->close(sk, timeout);
 438		sock->sk = NULL;
 439	}
 440	return 0;
 441}
 442EXPORT_SYMBOL(inet_release);
 443
 444int inet_bind_sk(struct sock *sk, struct sockaddr *uaddr, int addr_len)
 445{
 446	u32 flags = BIND_WITH_LOCK;
 447	int err;
 448
 449	/* If the socket has its own bind function then use it. (RAW) */
 450	if (sk->sk_prot->bind) {
 451		return sk->sk_prot->bind(sk, uaddr, addr_len);
 452	}
 453	if (addr_len < sizeof(struct sockaddr_in))
 454		return -EINVAL;
 455
 456	/* BPF prog is run before any checks are done so that if the prog
 457	 * changes context in a wrong way it will be caught.
 458	 */
 459	err = BPF_CGROUP_RUN_PROG_INET_BIND_LOCK(sk, uaddr, &addr_len,
 460						 CGROUP_INET4_BIND, &flags);
 461	if (err)
 462		return err;
 463
 464	return __inet_bind(sk, uaddr, addr_len, flags);
 465}
 466
 467int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
 468{
 469	return inet_bind_sk(sock->sk, uaddr, addr_len);
 470}
 471EXPORT_SYMBOL(inet_bind);
 472
 473int __inet_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len,
 474		u32 flags)
 475{
 476	struct sockaddr_in *addr = (struct sockaddr_in *)uaddr;
 477	struct inet_sock *inet = inet_sk(sk);
 478	struct net *net = sock_net(sk);
 479	unsigned short snum;
 480	int chk_addr_ret;
 481	u32 tb_id = RT_TABLE_LOCAL;
 482	int err;
 483
 484	if (addr->sin_family != AF_INET) {
 485		/* Compatibility games : accept AF_UNSPEC (mapped to AF_INET)
 486		 * only if s_addr is INADDR_ANY.
 487		 */
 488		err = -EAFNOSUPPORT;
 489		if (addr->sin_family != AF_UNSPEC ||
 490		    addr->sin_addr.s_addr != htonl(INADDR_ANY))
 491			goto out;
 492	}
 493
 494	tb_id = l3mdev_fib_table_by_index(net, sk->sk_bound_dev_if) ? : tb_id;
 495	chk_addr_ret = inet_addr_type_table(net, addr->sin_addr.s_addr, tb_id);
 496
 497	/* Not specified by any standard per-se, however it breaks too
 498	 * many applications when removed.  It is unfortunate since
 499	 * allowing applications to make a non-local bind solves
 500	 * several problems with systems using dynamic addressing.
 501	 * (ie. your servers still start up even if your ISDN link
 502	 *  is temporarily down)
 503	 */
 504	err = -EADDRNOTAVAIL;
 505	if (!inet_addr_valid_or_nonlocal(net, inet, addr->sin_addr.s_addr,
 506	                                 chk_addr_ret))
 
 
 
 507		goto out;
 508
 509	snum = ntohs(addr->sin_port);
 510	err = -EACCES;
 511	if (!(flags & BIND_NO_CAP_NET_BIND_SERVICE) &&
 512	    snum && inet_port_requires_bind_service(net, snum) &&
 513	    !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
 514		goto out;
 515
 516	/*      We keep a pair of addresses. rcv_saddr is the one
 517	 *      used by hash lookups, and saddr is used for transmit.
 518	 *
 519	 *      In the BSD API these are the same except where it
 520	 *      would be illegal to use them (multicast/broadcast) in
 521	 *      which case the sending device address is used.
 522	 */
 523	if (flags & BIND_WITH_LOCK)
 524		lock_sock(sk);
 525
 526	/* Check these errors (active socket, double bind). */
 527	err = -EINVAL;
 528	if (sk->sk_state != TCP_CLOSE || inet->inet_num)
 529		goto out_release_sock;
 530
 531	inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr;
 532	if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST)
 533		inet->inet_saddr = 0;  /* Use device */
 534
 535	/* Make sure we are allowed to bind here. */
 536	if (snum || !(inet_test_bit(BIND_ADDRESS_NO_PORT, sk) ||
 537		      (flags & BIND_FORCE_ADDRESS_NO_PORT))) {
 538		err = sk->sk_prot->get_port(sk, snum);
 539		if (err) {
 540			inet->inet_saddr = inet->inet_rcv_saddr = 0;
 
 541			goto out_release_sock;
 542		}
 543		if (!(flags & BIND_FROM_BPF)) {
 544			err = BPF_CGROUP_RUN_PROG_INET4_POST_BIND(sk);
 545			if (err) {
 546				inet->inet_saddr = inet->inet_rcv_saddr = 0;
 547				if (sk->sk_prot->put_port)
 548					sk->sk_prot->put_port(sk);
 549				goto out_release_sock;
 550			}
 551		}
 552	}
 553
 554	if (inet->inet_rcv_saddr)
 555		sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
 556	if (snum)
 557		sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
 558	inet->inet_sport = htons(inet->inet_num);
 559	inet->inet_daddr = 0;
 560	inet->inet_dport = 0;
 561	sk_dst_reset(sk);
 562	err = 0;
 563out_release_sock:
 564	if (flags & BIND_WITH_LOCK)
 565		release_sock(sk);
 566out:
 567	return err;
 568}
 569
 570int inet_dgram_connect(struct socket *sock, struct sockaddr *uaddr,
 571		       int addr_len, int flags)
 572{
 573	struct sock *sk = sock->sk;
 574	const struct proto *prot;
 575	int err;
 576
 577	if (addr_len < sizeof(uaddr->sa_family))
 578		return -EINVAL;
 579
 580	/* IPV6_ADDRFORM can change sk->sk_prot under us. */
 581	prot = READ_ONCE(sk->sk_prot);
 582
 583	if (uaddr->sa_family == AF_UNSPEC)
 584		return prot->disconnect(sk, flags);
 585
 586	if (BPF_CGROUP_PRE_CONNECT_ENABLED(sk)) {
 587		err = prot->pre_connect(sk, uaddr, addr_len);
 588		if (err)
 589			return err;
 590	}
 591
 592	if (data_race(!inet_sk(sk)->inet_num) && inet_autobind(sk))
 593		return -EAGAIN;
 594	return prot->connect(sk, uaddr, addr_len);
 595}
 596EXPORT_SYMBOL(inet_dgram_connect);
 597
 598static long inet_wait_for_connect(struct sock *sk, long timeo, int writebias)
 599{
 600	DEFINE_WAIT_FUNC(wait, woken_wake_function);
 601
 602	add_wait_queue(sk_sleep(sk), &wait);
 603	sk->sk_write_pending += writebias;
 604
 605	/* Basic assumption: if someone sets sk->sk_err, he _must_
 606	 * change state of the socket from TCP_SYN_*.
 607	 * Connect() does not allow to get error notifications
 608	 * without closing the socket.
 609	 */
 610	while ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
 611		release_sock(sk);
 612		timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo);
 613		lock_sock(sk);
 614		if (signal_pending(current) || !timeo)
 615			break;
 616	}
 617	remove_wait_queue(sk_sleep(sk), &wait);
 618	sk->sk_write_pending -= writebias;
 619	return timeo;
 620}
 621
 622/*
 623 *	Connect to a remote host. There is regrettably still a little
 624 *	TCP 'magic' in here.
 625 */
 626int __inet_stream_connect(struct socket *sock, struct sockaddr *uaddr,
 627			  int addr_len, int flags, int is_sendmsg)
 628{
 629	struct sock *sk = sock->sk;
 630	int err;
 631	long timeo;
 632
 633	/*
 634	 * uaddr can be NULL and addr_len can be 0 if:
 635	 * sk is a TCP fastopen active socket and
 636	 * TCP_FASTOPEN_CONNECT sockopt is set and
 637	 * we already have a valid cookie for this socket.
 638	 * In this case, user can call write() after connect().
 639	 * write() will invoke tcp_sendmsg_fastopen() which calls
 640	 * __inet_stream_connect().
 641	 */
 642	if (uaddr) {
 643		if (addr_len < sizeof(uaddr->sa_family))
 644			return -EINVAL;
 645
 646		if (uaddr->sa_family == AF_UNSPEC) {
 647			sk->sk_disconnects++;
 648			err = sk->sk_prot->disconnect(sk, flags);
 649			sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED;
 650			goto out;
 651		}
 652	}
 653
 654	switch (sock->state) {
 655	default:
 656		err = -EINVAL;
 657		goto out;
 658	case SS_CONNECTED:
 659		err = -EISCONN;
 660		goto out;
 661	case SS_CONNECTING:
 662		if (inet_test_bit(DEFER_CONNECT, sk))
 663			err = is_sendmsg ? -EINPROGRESS : -EISCONN;
 664		else
 665			err = -EALREADY;
 666		/* Fall out of switch with err, set for this state */
 667		break;
 668	case SS_UNCONNECTED:
 669		err = -EISCONN;
 670		if (sk->sk_state != TCP_CLOSE)
 671			goto out;
 672
 673		if (BPF_CGROUP_PRE_CONNECT_ENABLED(sk)) {
 674			err = sk->sk_prot->pre_connect(sk, uaddr, addr_len);
 675			if (err)
 676				goto out;
 677		}
 678
 679		err = sk->sk_prot->connect(sk, uaddr, addr_len);
 680		if (err < 0)
 681			goto out;
 682
 683		sock->state = SS_CONNECTING;
 684
 685		if (!err && inet_test_bit(DEFER_CONNECT, sk))
 686			goto out;
 687
 688		/* Just entered SS_CONNECTING state; the only
 689		 * difference is that return value in non-blocking
 690		 * case is EINPROGRESS, rather than EALREADY.
 691		 */
 692		err = -EINPROGRESS;
 693		break;
 694	}
 695
 696	timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
 697
 698	if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
 699		int writebias = (sk->sk_protocol == IPPROTO_TCP) &&
 700				tcp_sk(sk)->fastopen_req &&
 701				tcp_sk(sk)->fastopen_req->data ? 1 : 0;
 702		int dis = sk->sk_disconnects;
 703
 704		/* Error code is set above */
 705		if (!timeo || !inet_wait_for_connect(sk, timeo, writebias))
 706			goto out;
 707
 708		err = sock_intr_errno(timeo);
 709		if (signal_pending(current))
 710			goto out;
 711
 712		if (dis != sk->sk_disconnects) {
 713			err = -EPIPE;
 714			goto out;
 715		}
 716	}
 717
 718	/* Connection was closed by RST, timeout, ICMP error
 719	 * or another process disconnected us.
 720	 */
 721	if (sk->sk_state == TCP_CLOSE)
 722		goto sock_error;
 723
 724	/* sk->sk_err may be not zero now, if RECVERR was ordered by user
 725	 * and error was received after socket entered established state.
 726	 * Hence, it is handled normally after connect() return successfully.
 727	 */
 728
 729	sock->state = SS_CONNECTED;
 730	err = 0;
 731out:
 732	return err;
 733
 734sock_error:
 735	err = sock_error(sk) ? : -ECONNABORTED;
 736	sock->state = SS_UNCONNECTED;
 737	sk->sk_disconnects++;
 738	if (sk->sk_prot->disconnect(sk, flags))
 739		sock->state = SS_DISCONNECTING;
 740	goto out;
 741}
 742EXPORT_SYMBOL(__inet_stream_connect);
 743
 744int inet_stream_connect(struct socket *sock, struct sockaddr *uaddr,
 745			int addr_len, int flags)
 746{
 747	int err;
 748
 749	lock_sock(sock->sk);
 750	err = __inet_stream_connect(sock, uaddr, addr_len, flags, 0);
 751	release_sock(sock->sk);
 752	return err;
 753}
 754EXPORT_SYMBOL(inet_stream_connect);
 755
 756void __inet_accept(struct socket *sock, struct socket *newsock, struct sock *newsk)
 757{
 758	sock_rps_record_flow(newsk);
 759	WARN_ON(!((1 << newsk->sk_state) &
 760		  (TCPF_ESTABLISHED | TCPF_SYN_RECV |
 761		   TCPF_FIN_WAIT1 | TCPF_FIN_WAIT2 |
 762		   TCPF_CLOSING | TCPF_CLOSE_WAIT |
 763		   TCPF_CLOSE)));
 764
 765	if (test_bit(SOCK_SUPPORT_ZC, &sock->flags))
 766		set_bit(SOCK_SUPPORT_ZC, &newsock->flags);
 767	sock_graft(newsk, newsock);
 768
 769	newsock->state = SS_CONNECTED;
 770}
 771
 772/*
 773 *	Accept a pending connection. The TCP layer now gives BSD semantics.
 774 */
 775
 776int inet_accept(struct socket *sock, struct socket *newsock, int flags,
 777		bool kern)
 778{
 779	struct sock *sk1 = sock->sk, *sk2;
 780	int err = -EINVAL;
 
 781
 782	/* IPV6_ADDRFORM can change sk->sk_prot under us. */
 783	sk2 = READ_ONCE(sk1->sk_prot)->accept(sk1, flags, &err, kern);
 784	if (!sk2)
 785		return err;
 786
 787	lock_sock(sk2);
 788	__inet_accept(sock, newsock, sk2);
 
 
 
 
 
 
 
 
 
 789	release_sock(sk2);
 790	return 0;
 
 791}
 792EXPORT_SYMBOL(inet_accept);
 793
 
 794/*
 795 *	This does both peername and sockname.
 796 */
 797int inet_getname(struct socket *sock, struct sockaddr *uaddr,
 798		 int peer)
 799{
 800	struct sock *sk		= sock->sk;
 801	struct inet_sock *inet	= inet_sk(sk);
 802	DECLARE_SOCKADDR(struct sockaddr_in *, sin, uaddr);
 803	int sin_addr_len = sizeof(*sin);
 804
 805	sin->sin_family = AF_INET;
 806	lock_sock(sk);
 807	if (peer) {
 808		if (!inet->inet_dport ||
 809		    (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
 810		     peer == 1)) {
 811			release_sock(sk);
 812			return -ENOTCONN;
 813		}
 814		sin->sin_port = inet->inet_dport;
 815		sin->sin_addr.s_addr = inet->inet_daddr;
 816		BPF_CGROUP_RUN_SA_PROG(sk, (struct sockaddr *)sin, &sin_addr_len,
 817				       CGROUP_INET4_GETPEERNAME);
 818	} else {
 819		__be32 addr = inet->inet_rcv_saddr;
 820		if (!addr)
 821			addr = inet->inet_saddr;
 822		sin->sin_port = inet->inet_sport;
 823		sin->sin_addr.s_addr = addr;
 824		BPF_CGROUP_RUN_SA_PROG(sk, (struct sockaddr *)sin, &sin_addr_len,
 825				       CGROUP_INET4_GETSOCKNAME);
 826	}
 827	release_sock(sk);
 828	memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
 829	return sin_addr_len;
 830}
 831EXPORT_SYMBOL(inet_getname);
 832
 833int inet_send_prepare(struct sock *sk)
 834{
 835	sock_rps_record_flow(sk);
 836
 837	/* We may need to bind the socket. */
 838	if (data_race(!inet_sk(sk)->inet_num) && !sk->sk_prot->no_autobind &&
 839	    inet_autobind(sk))
 840		return -EAGAIN;
 841
 842	return 0;
 843}
 844EXPORT_SYMBOL_GPL(inet_send_prepare);
 845
 846int inet_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
 847{
 848	struct sock *sk = sock->sk;
 849
 850	if (unlikely(inet_send_prepare(sk)))
 851		return -EAGAIN;
 852
 853	return INDIRECT_CALL_2(sk->sk_prot->sendmsg, tcp_sendmsg, udp_sendmsg,
 854			       sk, msg, size);
 855}
 856EXPORT_SYMBOL(inet_sendmsg);
 857
 858void inet_splice_eof(struct socket *sock)
 
 859{
 860	const struct proto *prot;
 861	struct sock *sk = sock->sk;
 862
 863	if (unlikely(inet_send_prepare(sk)))
 864		return;
 865
 866	/* IPV6_ADDRFORM can change sk->sk_prot under us. */
 867	prot = READ_ONCE(sk->sk_prot);
 868	if (prot->splice_eof)
 869		prot->splice_eof(sock);
 870}
 871EXPORT_SYMBOL_GPL(inet_splice_eof);
 872
 873INDIRECT_CALLABLE_DECLARE(int udp_recvmsg(struct sock *, struct msghdr *,
 874					  size_t, int, int *));
 875int inet_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
 876		 int flags)
 877{
 878	struct sock *sk = sock->sk;
 879	int addr_len = 0;
 880	int err;
 881
 882	if (likely(!(flags & MSG_ERRQUEUE)))
 883		sock_rps_record_flow(sk);
 884
 885	err = INDIRECT_CALL_2(sk->sk_prot->recvmsg, tcp_recvmsg, udp_recvmsg,
 886			      sk, msg, size, flags, &addr_len);
 
 887	if (err >= 0)
 888		msg->msg_namelen = addr_len;
 889	return err;
 890}
 891EXPORT_SYMBOL(inet_recvmsg);
 892
 893int inet_shutdown(struct socket *sock, int how)
 894{
 895	struct sock *sk = sock->sk;
 896	int err = 0;
 897
 898	/* This should really check to make sure
 899	 * the socket is a TCP socket. (WHY AC...)
 900	 */
 901	how++; /* maps 0->1 has the advantage of making bit 1 rcvs and
 902		       1->2 bit 2 snds.
 903		       2->3 */
 904	if ((how & ~SHUTDOWN_MASK) || !how)	/* MAXINT->0 */
 905		return -EINVAL;
 906
 907	lock_sock(sk);
 908	if (sock->state == SS_CONNECTING) {
 909		if ((1 << sk->sk_state) &
 910		    (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE))
 911			sock->state = SS_DISCONNECTING;
 912		else
 913			sock->state = SS_CONNECTED;
 914	}
 915
 916	switch (sk->sk_state) {
 917	case TCP_CLOSE:
 918		err = -ENOTCONN;
 919		/* Hack to wake up other listeners, who can poll for
 920		   EPOLLHUP, even on eg. unconnected UDP sockets -- RR */
 921		fallthrough;
 922	default:
 923		WRITE_ONCE(sk->sk_shutdown, sk->sk_shutdown | how);
 924		if (sk->sk_prot->shutdown)
 925			sk->sk_prot->shutdown(sk, how);
 926		break;
 927
 928	/* Remaining two branches are temporary solution for missing
 929	 * close() in multithreaded environment. It is _not_ a good idea,
 930	 * but we have no choice until close() is repaired at VFS level.
 931	 */
 932	case TCP_LISTEN:
 933		if (!(how & RCV_SHUTDOWN))
 934			break;
 935		fallthrough;
 936	case TCP_SYN_SENT:
 937		err = sk->sk_prot->disconnect(sk, O_NONBLOCK);
 938		sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED;
 939		break;
 940	}
 941
 942	/* Wake up anyone sleeping in poll. */
 943	sk->sk_state_change(sk);
 944	release_sock(sk);
 945	return err;
 946}
 947EXPORT_SYMBOL(inet_shutdown);
 948
 949/*
 950 *	ioctl() calls you can issue on an INET socket. Most of these are
 951 *	device configuration and stuff and very rarely used. Some ioctls
 952 *	pass on to the socket itself.
 953 *
 954 *	NOTE: I like the idea of a module for the config stuff. ie ifconfig
 955 *	loads the devconfigure module does its configuring and unloads it.
 956 *	There's a good 20K of config code hanging around the kernel.
 957 */
 958
 959int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 960{
 961	struct sock *sk = sock->sk;
 962	int err = 0;
 963	struct net *net = sock_net(sk);
 964	void __user *p = (void __user *)arg;
 965	struct ifreq ifr;
 966	struct rtentry rt;
 967
 968	switch (cmd) {
 969	case SIOCADDRT:
 970	case SIOCDELRT:
 971		if (copy_from_user(&rt, p, sizeof(struct rtentry)))
 972			return -EFAULT;
 973		err = ip_rt_ioctl(net, cmd, &rt);
 974		break;
 975	case SIOCRTMSG:
 976		err = -EINVAL;
 977		break;
 978	case SIOCDARP:
 979	case SIOCGARP:
 980	case SIOCSARP:
 981		err = arp_ioctl(net, cmd, (void __user *)arg);
 982		break;
 983	case SIOCGIFADDR:
 984	case SIOCGIFBRDADDR:
 985	case SIOCGIFNETMASK:
 986	case SIOCGIFDSTADDR:
 987	case SIOCGIFPFLAGS:
 988		if (get_user_ifreq(&ifr, NULL, p))
 989			return -EFAULT;
 990		err = devinet_ioctl(net, cmd, &ifr);
 991		if (!err && put_user_ifreq(&ifr, p))
 992			err = -EFAULT;
 993		break;
 994
 995	case SIOCSIFADDR:
 996	case SIOCSIFBRDADDR:
 997	case SIOCSIFNETMASK:
 998	case SIOCSIFDSTADDR:
 999	case SIOCSIFPFLAGS:
1000	case SIOCSIFFLAGS:
1001		if (get_user_ifreq(&ifr, NULL, p))
1002			return -EFAULT;
1003		err = devinet_ioctl(net, cmd, &ifr);
1004		break;
1005	default:
1006		if (sk->sk_prot->ioctl)
1007			err = sk_ioctl(sk, cmd, (void __user *)arg);
1008		else
1009			err = -ENOIOCTLCMD;
1010		break;
1011	}
1012	return err;
1013}
1014EXPORT_SYMBOL(inet_ioctl);
1015
1016#ifdef CONFIG_COMPAT
1017static int inet_compat_routing_ioctl(struct sock *sk, unsigned int cmd,
1018		struct compat_rtentry __user *ur)
1019{
1020	compat_uptr_t rtdev;
1021	struct rtentry rt;
1022
1023	if (copy_from_user(&rt.rt_dst, &ur->rt_dst,
1024			3 * sizeof(struct sockaddr)) ||
1025	    get_user(rt.rt_flags, &ur->rt_flags) ||
1026	    get_user(rt.rt_metric, &ur->rt_metric) ||
1027	    get_user(rt.rt_mtu, &ur->rt_mtu) ||
1028	    get_user(rt.rt_window, &ur->rt_window) ||
1029	    get_user(rt.rt_irtt, &ur->rt_irtt) ||
1030	    get_user(rtdev, &ur->rt_dev))
1031		return -EFAULT;
1032
1033	rt.rt_dev = compat_ptr(rtdev);
1034	return ip_rt_ioctl(sock_net(sk), cmd, &rt);
1035}
1036
1037static int inet_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1038{
1039	void __user *argp = compat_ptr(arg);
1040	struct sock *sk = sock->sk;
 
1041
1042	switch (cmd) {
1043	case SIOCADDRT:
1044	case SIOCDELRT:
1045		return inet_compat_routing_ioctl(sk, cmd, argp);
1046	default:
1047		if (!sk->sk_prot->compat_ioctl)
1048			return -ENOIOCTLCMD;
1049		return sk->sk_prot->compat_ioctl(sk, cmd, arg);
1050	}
1051}
1052#endif /* CONFIG_COMPAT */
1053
1054const struct proto_ops inet_stream_ops = {
1055	.family		   = PF_INET,
1056	.owner		   = THIS_MODULE,
1057	.release	   = inet_release,
1058	.bind		   = inet_bind,
1059	.connect	   = inet_stream_connect,
1060	.socketpair	   = sock_no_socketpair,
1061	.accept		   = inet_accept,
1062	.getname	   = inet_getname,
1063	.poll		   = tcp_poll,
1064	.ioctl		   = inet_ioctl,
1065	.gettstamp	   = sock_gettstamp,
1066	.listen		   = inet_listen,
1067	.shutdown	   = inet_shutdown,
1068	.setsockopt	   = sock_common_setsockopt,
1069	.getsockopt	   = sock_common_getsockopt,
1070	.sendmsg	   = inet_sendmsg,
1071	.recvmsg	   = inet_recvmsg,
1072#ifdef CONFIG_MMU
1073	.mmap		   = tcp_mmap,
1074#endif
1075	.splice_eof	   = inet_splice_eof,
1076	.splice_read	   = tcp_splice_read,
1077	.read_sock	   = tcp_read_sock,
1078	.read_skb	   = tcp_read_skb,
1079	.sendmsg_locked    = tcp_sendmsg_locked,
 
1080	.peek_len	   = tcp_peek_len,
1081#ifdef CONFIG_COMPAT
 
 
1082	.compat_ioctl	   = inet_compat_ioctl,
1083#endif
1084	.set_rcvlowat	   = tcp_set_rcvlowat,
1085};
1086EXPORT_SYMBOL(inet_stream_ops);
1087
1088const struct proto_ops inet_dgram_ops = {
1089	.family		   = PF_INET,
1090	.owner		   = THIS_MODULE,
1091	.release	   = inet_release,
1092	.bind		   = inet_bind,
1093	.connect	   = inet_dgram_connect,
1094	.socketpair	   = sock_no_socketpair,
1095	.accept		   = sock_no_accept,
1096	.getname	   = inet_getname,
1097	.poll		   = udp_poll,
1098	.ioctl		   = inet_ioctl,
1099	.gettstamp	   = sock_gettstamp,
1100	.listen		   = sock_no_listen,
1101	.shutdown	   = inet_shutdown,
1102	.setsockopt	   = sock_common_setsockopt,
1103	.getsockopt	   = sock_common_getsockopt,
1104	.sendmsg	   = inet_sendmsg,
1105	.read_skb	   = udp_read_skb,
1106	.recvmsg	   = inet_recvmsg,
1107	.mmap		   = sock_no_mmap,
1108	.splice_eof	   = inet_splice_eof,
1109	.set_peek_off	   = udp_set_peek_off,
1110#ifdef CONFIG_COMPAT
 
 
1111	.compat_ioctl	   = inet_compat_ioctl,
1112#endif
1113};
1114EXPORT_SYMBOL(inet_dgram_ops);
1115
1116/*
1117 * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without
1118 * udp_poll
1119 */
1120static const struct proto_ops inet_sockraw_ops = {
1121	.family		   = PF_INET,
1122	.owner		   = THIS_MODULE,
1123	.release	   = inet_release,
1124	.bind		   = inet_bind,
1125	.connect	   = inet_dgram_connect,
1126	.socketpair	   = sock_no_socketpair,
1127	.accept		   = sock_no_accept,
1128	.getname	   = inet_getname,
1129	.poll		   = datagram_poll,
1130	.ioctl		   = inet_ioctl,
1131	.gettstamp	   = sock_gettstamp,
1132	.listen		   = sock_no_listen,
1133	.shutdown	   = inet_shutdown,
1134	.setsockopt	   = sock_common_setsockopt,
1135	.getsockopt	   = sock_common_getsockopt,
1136	.sendmsg	   = inet_sendmsg,
1137	.recvmsg	   = inet_recvmsg,
1138	.mmap		   = sock_no_mmap,
1139	.splice_eof	   = inet_splice_eof,
1140#ifdef CONFIG_COMPAT
 
 
1141	.compat_ioctl	   = inet_compat_ioctl,
1142#endif
1143};
1144
1145static const struct net_proto_family inet_family_ops = {
1146	.family = PF_INET,
1147	.create = inet_create,
1148	.owner	= THIS_MODULE,
1149};
1150
1151/* Upon startup we insert all the elements in inetsw_array[] into
1152 * the linked list inetsw.
1153 */
1154static struct inet_protosw inetsw_array[] =
1155{
1156	{
1157		.type =       SOCK_STREAM,
1158		.protocol =   IPPROTO_TCP,
1159		.prot =       &tcp_prot,
1160		.ops =        &inet_stream_ops,
1161		.flags =      INET_PROTOSW_PERMANENT |
1162			      INET_PROTOSW_ICSK,
1163	},
1164
1165	{
1166		.type =       SOCK_DGRAM,
1167		.protocol =   IPPROTO_UDP,
1168		.prot =       &udp_prot,
1169		.ops =        &inet_dgram_ops,
1170		.flags =      INET_PROTOSW_PERMANENT,
1171       },
1172
1173       {
1174		.type =       SOCK_DGRAM,
1175		.protocol =   IPPROTO_ICMP,
1176		.prot =       &ping_prot,
1177		.ops =        &inet_sockraw_ops,
1178		.flags =      INET_PROTOSW_REUSE,
1179       },
1180
1181       {
1182	       .type =       SOCK_RAW,
1183	       .protocol =   IPPROTO_IP,	/* wild card */
1184	       .prot =       &raw_prot,
1185	       .ops =        &inet_sockraw_ops,
1186	       .flags =      INET_PROTOSW_REUSE,
1187       }
1188};
1189
1190#define INETSW_ARRAY_LEN ARRAY_SIZE(inetsw_array)
1191
1192void inet_register_protosw(struct inet_protosw *p)
1193{
1194	struct list_head *lh;
1195	struct inet_protosw *answer;
1196	int protocol = p->protocol;
1197	struct list_head *last_perm;
1198
1199	spin_lock_bh(&inetsw_lock);
1200
1201	if (p->type >= SOCK_MAX)
1202		goto out_illegal;
1203
1204	/* If we are trying to override a permanent protocol, bail. */
1205	last_perm = &inetsw[p->type];
1206	list_for_each(lh, &inetsw[p->type]) {
1207		answer = list_entry(lh, struct inet_protosw, list);
1208		/* Check only the non-wild match. */
1209		if ((INET_PROTOSW_PERMANENT & answer->flags) == 0)
1210			break;
1211		if (protocol == answer->protocol)
1212			goto out_permanent;
1213		last_perm = lh;
1214	}
1215
1216	/* Add the new entry after the last permanent entry if any, so that
1217	 * the new entry does not override a permanent entry when matched with
1218	 * a wild-card protocol. But it is allowed to override any existing
1219	 * non-permanent entry.  This means that when we remove this entry, the
1220	 * system automatically returns to the old behavior.
1221	 */
1222	list_add_rcu(&p->list, last_perm);
1223out:
1224	spin_unlock_bh(&inetsw_lock);
1225
1226	return;
1227
1228out_permanent:
1229	pr_err("Attempt to override permanent protocol %d\n", protocol);
1230	goto out;
1231
1232out_illegal:
1233	pr_err("Ignoring attempt to register invalid socket type %d\n",
1234	       p->type);
1235	goto out;
1236}
1237EXPORT_SYMBOL(inet_register_protosw);
1238
1239void inet_unregister_protosw(struct inet_protosw *p)
1240{
1241	if (INET_PROTOSW_PERMANENT & p->flags) {
1242		pr_err("Attempt to unregister permanent protocol %d\n",
1243		       p->protocol);
1244	} else {
1245		spin_lock_bh(&inetsw_lock);
1246		list_del_rcu(&p->list);
1247		spin_unlock_bh(&inetsw_lock);
1248
1249		synchronize_net();
1250	}
1251}
1252EXPORT_SYMBOL(inet_unregister_protosw);
1253
1254static int inet_sk_reselect_saddr(struct sock *sk)
1255{
1256	struct inet_sock *inet = inet_sk(sk);
1257	__be32 old_saddr = inet->inet_saddr;
1258	__be32 daddr = inet->inet_daddr;
1259	struct flowi4 *fl4;
1260	struct rtable *rt;
1261	__be32 new_saddr;
1262	struct ip_options_rcu *inet_opt;
1263	int err;
1264
1265	inet_opt = rcu_dereference_protected(inet->inet_opt,
1266					     lockdep_sock_is_held(sk));
1267	if (inet_opt && inet_opt->opt.srr)
1268		daddr = inet_opt->opt.faddr;
1269
1270	/* Query new route. */
1271	fl4 = &inet->cork.fl.u.ip4;
1272	rt = ip_route_connect(fl4, daddr, 0, sk->sk_bound_dev_if,
1273			      sk->sk_protocol, inet->inet_sport,
1274			      inet->inet_dport, sk);
1275	if (IS_ERR(rt))
1276		return PTR_ERR(rt);
1277
 
 
1278	new_saddr = fl4->saddr;
1279
1280	if (new_saddr == old_saddr) {
1281		sk_setup_caps(sk, &rt->dst);
1282		return 0;
1283	}
1284
1285	err = inet_bhash2_update_saddr(sk, &new_saddr, AF_INET);
1286	if (err) {
1287		ip_rt_put(rt);
1288		return err;
1289	}
1290
1291	sk_setup_caps(sk, &rt->dst);
1292
1293	if (READ_ONCE(sock_net(sk)->ipv4.sysctl_ip_dynaddr) > 1) {
1294		pr_info("%s(): shifting inet->saddr from %pI4 to %pI4\n",
1295			__func__, &old_saddr, &new_saddr);
1296	}
1297
 
 
1298	/*
1299	 * XXX The only one ugly spot where we need to
1300	 * XXX really change the sockets identity after
1301	 * XXX it has entered the hashes. -DaveM
1302	 *
1303	 * Besides that, it does not check for connection
1304	 * uniqueness. Wait for troubles.
1305	 */
1306	return __sk_prot_rehash(sk);
1307}
1308
1309int inet_sk_rebuild_header(struct sock *sk)
1310{
1311	struct rtable *rt = dst_rtable(__sk_dst_check(sk, 0));
1312	struct inet_sock *inet = inet_sk(sk);
 
1313	__be32 daddr;
1314	struct ip_options_rcu *inet_opt;
1315	struct flowi4 *fl4;
1316	int err;
1317
1318	/* Route is OK, nothing to do. */
1319	if (rt)
1320		return 0;
1321
1322	/* Reroute. */
1323	rcu_read_lock();
1324	inet_opt = rcu_dereference(inet->inet_opt);
1325	daddr = inet->inet_daddr;
1326	if (inet_opt && inet_opt->opt.srr)
1327		daddr = inet_opt->opt.faddr;
1328	rcu_read_unlock();
1329	fl4 = &inet->cork.fl.u.ip4;
1330	rt = ip_route_output_ports(sock_net(sk), fl4, sk, daddr, inet->inet_saddr,
1331				   inet->inet_dport, inet->inet_sport,
1332				   sk->sk_protocol, ip_sock_rt_tos(sk),
1333				   sk->sk_bound_dev_if);
1334	if (!IS_ERR(rt)) {
1335		err = 0;
1336		sk_setup_caps(sk, &rt->dst);
1337	} else {
1338		err = PTR_ERR(rt);
1339
1340		/* Routing failed... */
1341		sk->sk_route_caps = 0;
1342		/*
1343		 * Other protocols have to map its equivalent state to TCP_SYN_SENT.
1344		 * DCCP maps its DCCP_REQUESTING state to TCP_SYN_SENT. -acme
1345		 */
1346		if (!READ_ONCE(sock_net(sk)->ipv4.sysctl_ip_dynaddr) ||
1347		    sk->sk_state != TCP_SYN_SENT ||
1348		    (sk->sk_userlocks & SOCK_BINDADDR_LOCK) ||
1349		    (err = inet_sk_reselect_saddr(sk)) != 0)
1350			WRITE_ONCE(sk->sk_err_soft, -err);
1351	}
1352
1353	return err;
1354}
1355EXPORT_SYMBOL(inet_sk_rebuild_header);
1356
1357void inet_sk_set_state(struct sock *sk, int state)
1358{
1359	trace_inet_sock_set_state(sk, sk->sk_state, state);
1360	sk->sk_state = state;
1361}
1362EXPORT_SYMBOL(inet_sk_set_state);
1363
1364void inet_sk_state_store(struct sock *sk, int newstate)
1365{
1366	trace_inet_sock_set_state(sk, sk->sk_state, newstate);
1367	smp_store_release(&sk->sk_state, newstate);
1368}
1369
1370struct sk_buff *inet_gso_segment(struct sk_buff *skb,
1371				 netdev_features_t features)
1372{
1373	bool udpfrag = false, fixedid = false, gso_partial, encap;
1374	struct sk_buff *segs = ERR_PTR(-EINVAL);
1375	const struct net_offload *ops;
1376	unsigned int offset = 0;
1377	struct iphdr *iph;
1378	int proto, tot_len;
1379	int nhoff;
1380	int ihl;
1381	int id;
1382
1383	skb_reset_network_header(skb);
1384	nhoff = skb_network_header(skb) - skb_mac_header(skb);
1385	if (unlikely(!pskb_may_pull(skb, sizeof(*iph))))
1386		goto out;
1387
1388	iph = ip_hdr(skb);
1389	ihl = iph->ihl * 4;
1390	if (ihl < sizeof(*iph))
1391		goto out;
1392
1393	id = ntohs(iph->id);
1394	proto = iph->protocol;
1395
1396	/* Warning: after this point, iph might be no longer valid */
1397	if (unlikely(!pskb_may_pull(skb, ihl)))
1398		goto out;
1399	__skb_pull(skb, ihl);
1400
1401	encap = SKB_GSO_CB(skb)->encap_level > 0;
1402	if (encap)
1403		features &= skb->dev->hw_enc_features;
1404	SKB_GSO_CB(skb)->encap_level += ihl;
1405
1406	skb_reset_transport_header(skb);
1407
1408	segs = ERR_PTR(-EPROTONOSUPPORT);
1409
1410	if (!skb->encapsulation || encap) {
1411		udpfrag = !!(skb_shinfo(skb)->gso_type & SKB_GSO_UDP);
1412		fixedid = !!(skb_shinfo(skb)->gso_type & SKB_GSO_TCP_FIXEDID);
1413
1414		/* fixed ID is invalid if DF bit is not set */
1415		if (fixedid && !(ip_hdr(skb)->frag_off & htons(IP_DF)))
1416			goto out;
1417	}
1418
1419	ops = rcu_dereference(inet_offloads[proto]);
1420	if (likely(ops && ops->callbacks.gso_segment)) {
1421		segs = ops->callbacks.gso_segment(skb, features);
1422		if (!segs)
1423			skb->network_header = skb_mac_header(skb) + nhoff - skb->head;
1424	}
1425
1426	if (IS_ERR_OR_NULL(segs))
1427		goto out;
1428
1429	gso_partial = !!(skb_shinfo(segs)->gso_type & SKB_GSO_PARTIAL);
1430
1431	skb = segs;
1432	do {
1433		iph = (struct iphdr *)(skb_mac_header(skb) + nhoff);
1434		if (udpfrag) {
1435			iph->frag_off = htons(offset >> 3);
1436			if (skb->next)
1437				iph->frag_off |= htons(IP_MF);
1438			offset += skb->len - nhoff - ihl;
1439			tot_len = skb->len - nhoff;
1440		} else if (skb_is_gso(skb)) {
1441			if (!fixedid) {
1442				iph->id = htons(id);
1443				id += skb_shinfo(skb)->gso_segs;
1444			}
1445
1446			if (gso_partial)
1447				tot_len = skb_shinfo(skb)->gso_size +
1448					  SKB_GSO_CB(skb)->data_offset +
1449					  skb->head - (unsigned char *)iph;
1450			else
1451				tot_len = skb->len - nhoff;
1452		} else {
1453			if (!fixedid)
1454				iph->id = htons(id++);
1455			tot_len = skb->len - nhoff;
1456		}
1457		iph->tot_len = htons(tot_len);
1458		ip_send_check(iph);
1459		if (encap)
1460			skb_reset_inner_headers(skb);
1461		skb->network_header = (u8 *)iph - skb->head;
1462		skb_reset_mac_len(skb);
1463	} while ((skb = skb->next));
1464
1465out:
1466	return segs;
1467}
 
1468
1469static struct sk_buff *ipip_gso_segment(struct sk_buff *skb,
1470					netdev_features_t features)
1471{
1472	if (!(skb_shinfo(skb)->gso_type & SKB_GSO_IPXIP4))
1473		return ERR_PTR(-EINVAL);
1474
1475	return inet_gso_segment(skb, features);
1476}
1477
 
 
 
 
1478struct sk_buff *inet_gro_receive(struct list_head *head, struct sk_buff *skb)
1479{
1480	const struct net_offload *ops;
1481	struct sk_buff *pp = NULL;
1482	const struct iphdr *iph;
1483	struct sk_buff *p;
1484	unsigned int hlen;
1485	unsigned int off;
1486	unsigned int id;
1487	int flush = 1;
1488	int proto;
1489
1490	off = skb_gro_offset(skb);
1491	hlen = off + sizeof(*iph);
1492	iph = skb_gro_header(skb, hlen, off);
1493	if (unlikely(!iph))
1494		goto out;
 
 
 
1495
1496	proto = iph->protocol;
1497
 
1498	ops = rcu_dereference(inet_offloads[proto]);
1499	if (!ops || !ops->callbacks.gro_receive)
1500		goto out;
1501
1502	if (*(u8 *)iph != 0x45)
1503		goto out;
1504
1505	if (ip_is_fragment(iph))
1506		goto out;
1507
1508	if (unlikely(ip_fast_csum((u8 *)iph, 5)))
1509		goto out;
1510
1511	NAPI_GRO_CB(skb)->proto = proto;
1512	id = ntohl(*(__be32 *)&iph->id);
1513	flush = (u16)((ntohl(*(__be32 *)iph) ^ skb_gro_len(skb)) | (id & ~IP_DF));
1514	id >>= 16;
1515
1516	list_for_each_entry(p, head, list) {
1517		struct iphdr *iph2;
1518		u16 flush_id;
1519
1520		if (!NAPI_GRO_CB(p)->same_flow)
1521			continue;
1522
1523		iph2 = (struct iphdr *)(p->data + off);
1524		/* The above works because, with the exception of the top
1525		 * (inner most) layer, we only aggregate pkts with the same
1526		 * hdr length so all the hdrs we'll need to verify will start
1527		 * at the same offset.
1528		 */
1529		if ((iph->protocol ^ iph2->protocol) |
1530		    ((__force u32)iph->saddr ^ (__force u32)iph2->saddr) |
1531		    ((__force u32)iph->daddr ^ (__force u32)iph2->daddr)) {
1532			NAPI_GRO_CB(p)->same_flow = 0;
1533			continue;
1534		}
1535
1536		/* All fields must match except length and checksum. */
1537		NAPI_GRO_CB(p)->flush |=
1538			(iph->ttl ^ iph2->ttl) |
1539			(iph->tos ^ iph2->tos) |
1540			((iph->frag_off ^ iph2->frag_off) & htons(IP_DF));
1541
1542		NAPI_GRO_CB(p)->flush |= flush;
1543
1544		/* We need to store of the IP ID check to be included later
1545		 * when we can verify that this packet does in fact belong
1546		 * to a given flow.
1547		 */
1548		flush_id = (u16)(id - ntohs(iph2->id));
1549
1550		/* This bit of code makes it much easier for us to identify
1551		 * the cases where we are doing atomic vs non-atomic IP ID
1552		 * checks.  Specifically an atomic check can return IP ID
1553		 * values 0 - 0xFFFF, while a non-atomic check can only
1554		 * return 0 or 0xFFFF.
1555		 */
1556		if (!NAPI_GRO_CB(p)->is_atomic ||
1557		    !(iph->frag_off & htons(IP_DF))) {
1558			flush_id ^= NAPI_GRO_CB(p)->count;
1559			flush_id = flush_id ? 0xFFFF : 0;
1560		}
1561
1562		/* If the previous IP ID value was based on an atomic
1563		 * datagram we can overwrite the value and ignore it.
1564		 */
1565		if (NAPI_GRO_CB(skb)->is_atomic)
1566			NAPI_GRO_CB(p)->flush_id = flush_id;
1567		else
1568			NAPI_GRO_CB(p)->flush_id |= flush_id;
1569	}
1570
1571	NAPI_GRO_CB(skb)->is_atomic = !!(iph->frag_off & htons(IP_DF));
1572	NAPI_GRO_CB(skb)->flush |= flush;
1573	skb_set_network_header(skb, off);
1574	/* The above will be needed by the transport layer if there is one
1575	 * immediately following this IP hdr.
1576	 */
1577	NAPI_GRO_CB(skb)->inner_network_offset = off;
1578
1579	/* Note : No need to call skb_gro_postpull_rcsum() here,
1580	 * as we already checked checksum over ipv4 header was 0
1581	 */
1582	skb_gro_pull(skb, sizeof(*iph));
1583	skb_set_transport_header(skb, skb_gro_offset(skb));
1584
1585	pp = indirect_call_gro_receive(tcp4_gro_receive, udp4_gro_receive,
1586				       ops->callbacks.gro_receive, head, skb);
1587
 
 
 
1588out:
1589	skb_gro_flush_final(skb, pp, flush);
1590
1591	return pp;
1592}
 
1593
1594static struct sk_buff *ipip_gro_receive(struct list_head *head,
1595					struct sk_buff *skb)
1596{
1597	if (NAPI_GRO_CB(skb)->encap_mark) {
1598		NAPI_GRO_CB(skb)->flush = 1;
1599		return NULL;
1600	}
1601
1602	NAPI_GRO_CB(skb)->encap_mark = 1;
1603
1604	return inet_gro_receive(head, skb);
1605}
1606
1607#define SECONDS_PER_DAY	86400
1608
1609/* inet_current_timestamp - Return IP network timestamp
1610 *
1611 * Return milliseconds since midnight in network byte order.
1612 */
1613__be32 inet_current_timestamp(void)
1614{
1615	u32 secs;
1616	u32 msecs;
1617	struct timespec64 ts;
1618
1619	ktime_get_real_ts64(&ts);
1620
1621	/* Get secs since midnight. */
1622	(void)div_u64_rem(ts.tv_sec, SECONDS_PER_DAY, &secs);
1623	/* Convert to msecs. */
1624	msecs = secs * MSEC_PER_SEC;
1625	/* Convert nsec to msec. */
1626	msecs += (u32)ts.tv_nsec / NSEC_PER_MSEC;
1627
1628	/* Convert to network byte order. */
1629	return htonl(msecs);
1630}
1631EXPORT_SYMBOL(inet_current_timestamp);
1632
1633int inet_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len)
1634{
1635	unsigned int family = READ_ONCE(sk->sk_family);
1636
1637	if (family == AF_INET)
1638		return ip_recv_error(sk, msg, len, addr_len);
1639#if IS_ENABLED(CONFIG_IPV6)
1640	if (family == AF_INET6)
1641		return pingv6_ops.ipv6_recv_error(sk, msg, len, addr_len);
1642#endif
1643	return -EINVAL;
1644}
1645EXPORT_SYMBOL(inet_recv_error);
1646
 
 
1647int inet_gro_complete(struct sk_buff *skb, int nhoff)
1648{
 
1649	struct iphdr *iph = (struct iphdr *)(skb->data + nhoff);
1650	const struct net_offload *ops;
1651	__be16 totlen = iph->tot_len;
1652	int proto = iph->protocol;
1653	int err = -ENOSYS;
1654
1655	if (skb->encapsulation) {
1656		skb_set_inner_protocol(skb, cpu_to_be16(ETH_P_IP));
1657		skb_set_inner_network_header(skb, nhoff);
1658	}
1659
1660	iph_set_totlen(iph, skb->len - nhoff);
1661	csum_replace2(&iph->check, totlen, iph->tot_len);
1662
 
1663	ops = rcu_dereference(inet_offloads[proto]);
1664	if (WARN_ON(!ops || !ops->callbacks.gro_complete))
1665		goto out;
1666
1667	/* Only need to add sizeof(*iph) to get to the next hdr below
1668	 * because any hdr with option will have been flushed in
1669	 * inet_gro_receive().
1670	 */
1671	err = INDIRECT_CALL_2(ops->callbacks.gro_complete,
1672			      tcp4_gro_complete, udp4_gro_complete,
1673			      skb, nhoff + sizeof(*iph));
1674
1675out:
 
 
1676	return err;
1677}
 
1678
1679static int ipip_gro_complete(struct sk_buff *skb, int nhoff)
1680{
1681	skb->encapsulation = 1;
1682	skb_shinfo(skb)->gso_type |= SKB_GSO_IPXIP4;
1683	return inet_gro_complete(skb, nhoff);
1684}
1685
1686int inet_ctl_sock_create(struct sock **sk, unsigned short family,
1687			 unsigned short type, unsigned char protocol,
1688			 struct net *net)
1689{
1690	struct socket *sock;
1691	int rc = sock_create_kern(net, family, type, protocol, &sock);
1692
1693	if (rc == 0) {
1694		*sk = sock->sk;
1695		(*sk)->sk_allocation = GFP_ATOMIC;
1696		(*sk)->sk_use_task_frag = false;
1697		/*
1698		 * Unhash it so that IP input processing does not even see it,
1699		 * we do not wish this socket to see incoming packets.
1700		 */
1701		(*sk)->sk_prot->unhash(*sk);
1702	}
1703	return rc;
1704}
1705EXPORT_SYMBOL_GPL(inet_ctl_sock_create);
1706
 
 
 
 
 
 
1707unsigned long snmp_fold_field(void __percpu *mib, int offt)
1708{
1709	unsigned long res = 0;
1710	int i;
1711
1712	for_each_possible_cpu(i)
1713		res += snmp_get_cpu_field(mib, i, offt);
1714	return res;
1715}
1716EXPORT_SYMBOL_GPL(snmp_fold_field);
1717
1718#if BITS_PER_LONG==32
1719
1720u64 snmp_get_cpu_field64(void __percpu *mib, int cpu, int offt,
1721			 size_t syncp_offset)
1722{
1723	void *bhptr;
1724	struct u64_stats_sync *syncp;
1725	u64 v;
1726	unsigned int start;
1727
1728	bhptr = per_cpu_ptr(mib, cpu);
1729	syncp = (struct u64_stats_sync *)(bhptr + syncp_offset);
1730	do {
1731		start = u64_stats_fetch_begin(syncp);
1732		v = *(((u64 *)bhptr) + offt);
1733	} while (u64_stats_fetch_retry(syncp, start));
1734
1735	return v;
1736}
1737EXPORT_SYMBOL_GPL(snmp_get_cpu_field64);
1738
1739u64 snmp_fold_field64(void __percpu *mib, int offt, size_t syncp_offset)
1740{
1741	u64 res = 0;
1742	int cpu;
1743
1744	for_each_possible_cpu(cpu) {
1745		res += snmp_get_cpu_field64(mib, cpu, offt, syncp_offset);
1746	}
1747	return res;
1748}
1749EXPORT_SYMBOL_GPL(snmp_fold_field64);
1750#endif
1751
1752#ifdef CONFIG_IP_MULTICAST
1753static const struct net_protocol igmp_protocol = {
1754	.handler =	igmp_rcv,
 
1755};
1756#endif
1757
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1758static const struct net_protocol icmp_protocol = {
1759	.handler =	icmp_rcv,
1760	.err_handler =	icmp_err,
1761	.no_policy =	1,
 
1762};
1763
1764static __net_init int ipv4_mib_init_net(struct net *net)
1765{
1766	int i;
1767
1768	net->mib.tcp_statistics = alloc_percpu(struct tcp_mib);
1769	if (!net->mib.tcp_statistics)
1770		goto err_tcp_mib;
1771	net->mib.ip_statistics = alloc_percpu(struct ipstats_mib);
1772	if (!net->mib.ip_statistics)
1773		goto err_ip_mib;
1774
1775	for_each_possible_cpu(i) {
1776		struct ipstats_mib *af_inet_stats;
1777		af_inet_stats = per_cpu_ptr(net->mib.ip_statistics, i);
1778		u64_stats_init(&af_inet_stats->syncp);
1779	}
1780
1781	net->mib.net_statistics = alloc_percpu(struct linux_mib);
1782	if (!net->mib.net_statistics)
1783		goto err_net_mib;
1784	net->mib.udp_statistics = alloc_percpu(struct udp_mib);
1785	if (!net->mib.udp_statistics)
1786		goto err_udp_mib;
1787	net->mib.udplite_statistics = alloc_percpu(struct udp_mib);
1788	if (!net->mib.udplite_statistics)
1789		goto err_udplite_mib;
1790	net->mib.icmp_statistics = alloc_percpu(struct icmp_mib);
1791	if (!net->mib.icmp_statistics)
1792		goto err_icmp_mib;
1793	net->mib.icmpmsg_statistics = kzalloc(sizeof(struct icmpmsg_mib),
1794					      GFP_KERNEL);
1795	if (!net->mib.icmpmsg_statistics)
1796		goto err_icmpmsg_mib;
1797
1798	tcp_mib_init(net);
1799	return 0;
1800
1801err_icmpmsg_mib:
1802	free_percpu(net->mib.icmp_statistics);
1803err_icmp_mib:
1804	free_percpu(net->mib.udplite_statistics);
1805err_udplite_mib:
1806	free_percpu(net->mib.udp_statistics);
1807err_udp_mib:
1808	free_percpu(net->mib.net_statistics);
1809err_net_mib:
1810	free_percpu(net->mib.ip_statistics);
1811err_ip_mib:
1812	free_percpu(net->mib.tcp_statistics);
1813err_tcp_mib:
1814	return -ENOMEM;
1815}
1816
1817static __net_exit void ipv4_mib_exit_net(struct net *net)
1818{
1819	kfree(net->mib.icmpmsg_statistics);
1820	free_percpu(net->mib.icmp_statistics);
1821	free_percpu(net->mib.udplite_statistics);
1822	free_percpu(net->mib.udp_statistics);
1823	free_percpu(net->mib.net_statistics);
1824	free_percpu(net->mib.ip_statistics);
1825	free_percpu(net->mib.tcp_statistics);
1826#ifdef CONFIG_MPTCP
1827	/* allocated on demand, see mptcp_init_sock() */
1828	free_percpu(net->mib.mptcp_statistics);
1829#endif
1830}
1831
1832static __net_initdata struct pernet_operations ipv4_mib_ops = {
1833	.init = ipv4_mib_init_net,
1834	.exit = ipv4_mib_exit_net,
1835};
1836
1837static int __init init_ipv4_mibs(void)
1838{
1839	return register_pernet_subsys(&ipv4_mib_ops);
1840}
1841
1842static __net_init int inet_init_net(struct net *net)
1843{
1844	/*
1845	 * Set defaults for local port range
1846	 */
1847	net->ipv4.ip_local_ports.range = 60999u << 16 | 32768u;
 
 
1848
1849	seqlock_init(&net->ipv4.ping_group_range.lock);
1850	/*
1851	 * Sane defaults - nobody may create ping sockets.
1852	 * Boot scripts should set this to distro-specific group.
1853	 */
1854	net->ipv4.ping_group_range.range[0] = make_kgid(&init_user_ns, 1);
1855	net->ipv4.ping_group_range.range[1] = make_kgid(&init_user_ns, 0);
1856
1857	/* Default values for sysctl-controlled parameters.
1858	 * We set them here, in case sysctl is not compiled.
1859	 */
1860	net->ipv4.sysctl_ip_default_ttl = IPDEFTTL;
1861	net->ipv4.sysctl_ip_fwd_update_priority = 1;
1862	net->ipv4.sysctl_ip_dynaddr = 0;
1863	net->ipv4.sysctl_ip_early_demux = 1;
1864	net->ipv4.sysctl_udp_early_demux = 1;
1865	net->ipv4.sysctl_tcp_early_demux = 1;
1866	net->ipv4.sysctl_nexthop_compat_mode = 1;
1867#ifdef CONFIG_SYSCTL
1868	net->ipv4.sysctl_ip_prot_sock = PROT_SOCK;
1869#endif
1870
1871	/* Some igmp sysctl, whose values are always used */
1872	net->ipv4.sysctl_igmp_max_memberships = 20;
1873	net->ipv4.sysctl_igmp_max_msf = 10;
1874	/* IGMP reports for link-local multicast groups are enabled by default */
1875	net->ipv4.sysctl_igmp_llm_reports = 1;
1876	net->ipv4.sysctl_igmp_qrv = 2;
1877
1878	net->ipv4.sysctl_fib_notify_on_flag_change = 0;
1879
1880	return 0;
1881}
1882
1883static __net_initdata struct pernet_operations af_inet_ops = {
1884	.init = inet_init_net,
1885};
1886
1887static int __init init_inet_pernet_ops(void)
1888{
1889	return register_pernet_subsys(&af_inet_ops);
1890}
1891
1892static int ipv4_proc_init(void);
1893
1894/*
1895 *	IP protocol layer initialiser
1896 */
1897
 
 
 
 
 
 
 
 
1898
1899static const struct net_offload ipip_offload = {
1900	.callbacks = {
1901		.gso_segment	= ipip_gso_segment,
1902		.gro_receive	= ipip_gro_receive,
1903		.gro_complete	= ipip_gro_complete,
1904	},
1905};
1906
1907static int __init ipip_offload_init(void)
1908{
1909	return inet_add_offload(&ipip_offload, IPPROTO_IPIP);
1910}
1911
1912static int __init ipv4_offload_init(void)
1913{
1914	/*
1915	 * Add offloads
1916	 */
1917	if (udpv4_offload_init() < 0)
1918		pr_crit("%s: Cannot add UDP protocol offload\n", __func__);
1919	if (tcpv4_offload_init() < 0)
1920		pr_crit("%s: Cannot add TCP protocol offload\n", __func__);
1921	if (ipip_offload_init() < 0)
1922		pr_crit("%s: Cannot add IPIP protocol offload\n", __func__);
1923
1924	net_hotdata.ip_packet_offload = (struct packet_offload) {
1925		.type = cpu_to_be16(ETH_P_IP),
1926		.callbacks = {
1927			.gso_segment = inet_gso_segment,
1928			.gro_receive = inet_gro_receive,
1929			.gro_complete = inet_gro_complete,
1930		},
1931	};
1932	dev_add_offload(&net_hotdata.ip_packet_offload);
1933	return 0;
1934}
1935
1936fs_initcall(ipv4_offload_init);
1937
1938static struct packet_type ip_packet_type __read_mostly = {
1939	.type = cpu_to_be16(ETH_P_IP),
1940	.func = ip_rcv,
1941	.list_func = ip_list_rcv,
1942};
1943
1944static int __init inet_init(void)
1945{
1946	struct inet_protosw *q;
1947	struct list_head *r;
1948	int rc;
1949
1950	sock_skb_cb_check_size(sizeof(struct inet_skb_parm));
1951
1952	raw_hashinfo_init(&raw_v4_hashinfo);
1953
1954	rc = proto_register(&tcp_prot, 1);
1955	if (rc)
1956		goto out;
1957
1958	rc = proto_register(&udp_prot, 1);
1959	if (rc)
1960		goto out_unregister_tcp_proto;
1961
1962	rc = proto_register(&raw_prot, 1);
1963	if (rc)
1964		goto out_unregister_udp_proto;
1965
1966	rc = proto_register(&ping_prot, 1);
1967	if (rc)
1968		goto out_unregister_raw_proto;
1969
1970	/*
1971	 *	Tell SOCKET that we are alive...
1972	 */
1973
1974	(void)sock_register(&inet_family_ops);
1975
1976#ifdef CONFIG_SYSCTL
1977	ip_static_sysctl_init();
1978#endif
1979
1980	/*
1981	 *	Add all the base protocols.
1982	 */
1983
1984	if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0)
1985		pr_crit("%s: Cannot add ICMP protocol\n", __func__);
1986
1987	net_hotdata.udp_protocol = (struct net_protocol) {
1988		.handler =	udp_rcv,
1989		.err_handler =	udp_err,
1990		.no_policy =	1,
1991	};
1992	if (inet_add_protocol(&net_hotdata.udp_protocol, IPPROTO_UDP) < 0)
1993		pr_crit("%s: Cannot add UDP protocol\n", __func__);
1994
1995	net_hotdata.tcp_protocol = (struct net_protocol) {
1996		.handler	=	tcp_v4_rcv,
1997		.err_handler	=	tcp_v4_err,
1998		.no_policy	=	1,
1999		.icmp_strict_tag_validation = 1,
2000	};
2001	if (inet_add_protocol(&net_hotdata.tcp_protocol, IPPROTO_TCP) < 0)
2002		pr_crit("%s: Cannot add TCP protocol\n", __func__);
2003#ifdef CONFIG_IP_MULTICAST
2004	if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0)
2005		pr_crit("%s: Cannot add IGMP protocol\n", __func__);
2006#endif
2007
2008	/* Register the socket-side information for inet_create. */
2009	for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r)
2010		INIT_LIST_HEAD(r);
2011
2012	for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q)
2013		inet_register_protosw(q);
2014
2015	/*
2016	 *	Set the ARP module up
2017	 */
2018
2019	arp_init();
2020
2021	/*
2022	 *	Set the IP module up
2023	 */
2024
2025	ip_init();
2026
2027	/* Initialise per-cpu ipv4 mibs */
2028	if (init_ipv4_mibs())
2029		panic("%s: Cannot init ipv4 mibs\n", __func__);
2030
2031	/* Setup TCP slab cache for open requests. */
2032	tcp_init();
2033
2034	/* Setup UDP memory threshold */
2035	udp_init();
2036
2037	/* Add UDP-Lite (RFC 3828) */
2038	udplite4_register();
2039
2040	raw_init();
2041
2042	ping_init();
2043
2044	/*
2045	 *	Set the ICMP layer up
2046	 */
2047
2048	if (icmp_init() < 0)
2049		panic("Failed to create the ICMP control socket.\n");
2050
2051	/*
2052	 *	Initialise the multicast router
2053	 */
2054#if defined(CONFIG_IP_MROUTE)
2055	if (ip_mr_init())
2056		pr_crit("%s: Cannot init ipv4 mroute\n", __func__);
2057#endif
2058
2059	if (init_inet_pernet_ops())
2060		pr_crit("%s: Cannot init ipv4 inet pernet ops\n", __func__);
 
 
 
 
 
 
2061
2062	ipv4_proc_init();
2063
2064	ipfrag_init();
2065
2066	dev_add_pack(&ip_packet_type);
2067
2068	ip_tunnel_core_init();
2069
2070	rc = 0;
2071out:
2072	return rc;
2073out_unregister_raw_proto:
2074	proto_unregister(&raw_prot);
2075out_unregister_udp_proto:
2076	proto_unregister(&udp_prot);
2077out_unregister_tcp_proto:
2078	proto_unregister(&tcp_prot);
2079	goto out;
2080}
2081
2082fs_initcall(inet_init);
2083
2084/* ------------------------------------------------------------------------ */
2085
2086#ifdef CONFIG_PROC_FS
2087static int __init ipv4_proc_init(void)
2088{
2089	int rc = 0;
2090
2091	if (raw_proc_init())
2092		goto out_raw;
2093	if (tcp4_proc_init())
2094		goto out_tcp;
2095	if (udp4_proc_init())
2096		goto out_udp;
2097	if (ping_proc_init())
2098		goto out_ping;
2099	if (ip_misc_proc_init())
2100		goto out_misc;
2101out:
2102	return rc;
2103out_misc:
2104	ping_proc_exit();
2105out_ping:
2106	udp4_proc_exit();
2107out_udp:
2108	tcp4_proc_exit();
2109out_tcp:
2110	raw_proc_exit();
2111out_raw:
2112	rc = -ENOMEM;
2113	goto out;
2114}
2115
2116#else /* CONFIG_PROC_FS */
2117static int __init ipv4_proc_init(void)
2118{
2119	return 0;
2120}
2121#endif /* CONFIG_PROC_FS */