af_inet.c revision f1b050bf7a88910f9f00c9c8989c1bf5a67dd140 
1/*
2 * INET		An implementation of the TCP/IP protocol suite for the LINUX
3 *		operating system.  INET is implemented using the  BSD Socket
4 *		interface as the means of communication with the user level.
5 *
6 *		PF_INET protocol family socket handler.
7 *
8 * Version:	$Id: af_inet.c,v 1.137 2002/02/01 22:01:03 davem Exp $
9 *
10 * Authors:	Ross Biro
11 *		Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
12 *		Florian La Roche, <flla@stud.uni-sb.de>
13 *		Alan Cox, <A.Cox@swansea.ac.uk>
14 *
15 * Changes (see also sock.c)
16 *
17 *		piggy,
18 *		Karl Knutson	:	Socket protocol table
19 *		A.N.Kuznetsov	:	Socket death error in accept().
20 *		John Richardson :	Fix non blocking error in connect()
21 *					so sockets that fail to connect
22 *					don't return -EINPROGRESS.
23 *		Alan Cox	:	Asynchronous I/O support
24 *		Alan Cox	:	Keep correct socket pointer on sock
25 *					structures
26 *					when accept() ed
27 *		Alan Cox	:	Semantics of SO_LINGER aren't state
28 *					moved to close when you look carefully.
29 *					With this fixed and the accept bug fixed
30 *					some RPC stuff seems happier.
31 *		Niibe Yutaka	:	4.4BSD style write async I/O
32 *		Alan Cox,
33 *		Tony Gale 	:	Fixed reuse semantics.
34 *		Alan Cox	:	bind() shouldn't abort existing but dead
35 *					sockets. Stops FTP netin:.. I hope.
36 *		Alan Cox	:	bind() works correctly for RAW sockets.
37 *					Note that FreeBSD at least was broken
38 *					in this respect so be careful with
39 *					compatibility tests...
40 *		Alan Cox	:	routing cache support
41 *		Alan Cox	:	memzero the socket structure for
42 *					compactness.
43 *		Matt Day	:	nonblock connect error handler
44 *		Alan Cox	:	Allow large numbers of pending sockets
45 *					(eg for big web sites), but only if
46 *					specifically application requested.
47 *		Alan Cox	:	New buffering throughout IP. Used
48 *					dumbly.
49 *		Alan Cox	:	New buffering now used smartly.
50 *		Alan Cox	:	BSD rather than common sense
51 *					interpretation of listen.
52 *		Germano Caronni	:	Assorted small races.
53 *		Alan Cox	:	sendmsg/recvmsg basic support.
54 *		Alan Cox	:	Only sendmsg/recvmsg now supported.
55 *		Alan Cox	:	Locked down bind (see security list).
56 *		Alan Cox	:	Loosened bind a little.
57 *		Mike McLagan	:	ADD/DEL DLCI Ioctls
58 *	Willy Konynenberg	:	Transparent proxying support.
59 *		David S. Miller	:	New socket lookup architecture.
60 *					Some other random speedups.
61 *		Cyrus Durgin	:	Cleaned up file for kmod hacks.
62 *		Andi Kleen	:	Fix inet_stream_connect TCP race.
63 *
64 *		This program is free software; you can redistribute it and/or
65 *		modify it under the terms of the GNU General Public License
66 *		as published by the Free Software Foundation; either version
67 *		2 of the License, or (at your option) any later version.
68 */
69
70#include <linux/err.h>
71#include <linux/errno.h>
72#include <linux/types.h>
73#include <linux/socket.h>
74#include <linux/in.h>
75#include <linux/kernel.h>
76#include <linux/module.h>
77#include <linux/sched.h>
78#include <linux/timer.h>
79#include <linux/string.h>
80#include <linux/sockios.h>
81#include <linux/net.h>
82#include <linux/capability.h>
83#include <linux/fcntl.h>
84#include <linux/mm.h>
85#include <linux/interrupt.h>
86#include <linux/stat.h>
87#include <linux/init.h>
88#include <linux/poll.h>
89#include <linux/netfilter_ipv4.h>
90#include <linux/random.h>
91
92#include <asm/uaccess.h>
93#include <asm/system.h>
94
95#include <linux/inet.h>
96#include <linux/igmp.h>
97#include <linux/inetdevice.h>
98#include <linux/netdevice.h>
99#include <net/ip.h>
100#include <net/protocol.h>
101#include <net/arp.h>
102#include <net/route.h>
103#include <net/ip_fib.h>
104#include <net/inet_connection_sock.h>
105#include <net/tcp.h>
106#include <net/udp.h>
107#include <net/udplite.h>
108#include <linux/skbuff.h>
109#include <net/sock.h>
110#include <net/raw.h>
111#include <net/icmp.h>
112#include <net/ipip.h>
113#include <net/inet_common.h>
114#include <net/xfrm.h>
115#ifdef CONFIG_IP_MROUTE
116#include <linux/mroute.h>
117#endif
118
119DEFINE_SNMP_STAT(struct linux_mib, net_statistics) __read_mostly;
120
121extern void ip_mc_drop_socket(struct sock *sk);
122
123/* The inetsw table contains everything that inet_create needs to
124 * build a new socket.
125 */
126static struct list_head inetsw[SOCK_MAX];
127static DEFINE_SPINLOCK(inetsw_lock);
128
129struct ipv4_config ipv4_config;
130
131EXPORT_SYMBOL(ipv4_config);
132
133/* New destruction routine */
134
135void inet_sock_destruct(struct sock *sk)
136{
137	struct inet_sock *inet = inet_sk(sk);
138
139	__skb_queue_purge(&sk->sk_receive_queue);
140	__skb_queue_purge(&sk->sk_error_queue);
141
142	sk_mem_reclaim(sk);
143
144	if (sk->sk_type == SOCK_STREAM && sk->sk_state != TCP_CLOSE) {
145		printk("Attempt to release TCP socket in state %d %p\n",
146		       sk->sk_state, sk);
147		return;
148	}
149	if (!sock_flag(sk, SOCK_DEAD)) {
150		printk("Attempt to release alive inet socket %p\n", sk);
151		return;
152	}
153
154	BUG_TRAP(!atomic_read(&sk->sk_rmem_alloc));
155	BUG_TRAP(!atomic_read(&sk->sk_wmem_alloc));
156	BUG_TRAP(!sk->sk_wmem_queued);
157	BUG_TRAP(!sk->sk_forward_alloc);
158
159	kfree(inet->opt);
160	dst_release(sk->sk_dst_cache);
161	sk_refcnt_debug_dec(sk);
162}
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->num) {
181		if (sk->sk_prot->get_port(sk, 0)) {
182			release_sock(sk);
183			return -EAGAIN;
184		}
185		inet->sport = htons(inet->num);
186	}
187	release_sock(sk);
188	return 0;
189}
190
191/*
192 *	Move a socket into listening state.
193 */
194int inet_listen(struct socket *sock, int backlog)
195{
196	struct sock *sk = sock->sk;
197	unsigned char old_state;
198	int err;
199
200	lock_sock(sk);
201
202	err = -EINVAL;
203	if (sock->state != SS_UNCONNECTED || sock->type != SOCK_STREAM)
204		goto out;
205
206	old_state = sk->sk_state;
207	if (!((1 << old_state) & (TCPF_CLOSE | TCPF_LISTEN)))
208		goto out;
209
210	/* Really, if the socket is already in listen state
211	 * we can only allow the backlog to be adjusted.
212	 */
213	if (old_state != TCP_LISTEN) {
214		err = inet_csk_listen_start(sk, backlog);
215		if (err)
216			goto out;
217	}
218	sk->sk_max_ack_backlog = backlog;
219	err = 0;
220
221out:
222	release_sock(sk);
223	return err;
224}
225
226u32 inet_ehash_secret __read_mostly;
227EXPORT_SYMBOL(inet_ehash_secret);
228
229/*
230 * inet_ehash_secret must be set exactly once
231 * Instead of using a dedicated spinlock, we (ab)use inetsw_lock
232 */
233void build_ehash_secret(void)
234{
235	u32 rnd;
236	do {
237		get_random_bytes(&rnd, sizeof(rnd));
238	} while (rnd == 0);
239	spin_lock_bh(&inetsw_lock);
240	if (!inet_ehash_secret)
241		inet_ehash_secret = rnd;
242	spin_unlock_bh(&inetsw_lock);
243}
244EXPORT_SYMBOL(build_ehash_secret);
245
246/*
247 *	Create an inet socket.
248 */
249
250static int inet_create(struct net *net, struct socket *sock, int protocol)
251{
252	struct sock *sk;
253	struct list_head *p;
254	struct inet_protosw *answer;
255	struct inet_sock *inet;
256	struct proto *answer_prot;
257	unsigned char answer_flags;
258	char answer_no_check;
259	int try_loading_module = 0;
260	int err;
261
262	if (net != &init_net)
263		return -EAFNOSUPPORT;
264
265	if (sock->type != SOCK_RAW &&
266	    sock->type != SOCK_DGRAM &&
267	    !inet_ehash_secret)
268		build_ehash_secret();
269
270	sock->state = SS_UNCONNECTED;
271
272	/* Look for the requested type/protocol pair. */
273	answer = NULL;
274lookup_protocol:
275	err = -ESOCKTNOSUPPORT;
276	rcu_read_lock();
277	list_for_each_rcu(p, &inetsw[sock->type]) {
278		answer = list_entry(p, struct inet_protosw, list);
279
280		/* Check the non-wild match. */
281		if (protocol == answer->protocol) {
282			if (protocol != IPPROTO_IP)
283				break;
284		} else {
285			/* Check for the two wild cases. */
286			if (IPPROTO_IP == protocol) {
287				protocol = answer->protocol;
288				break;
289			}
290			if (IPPROTO_IP == answer->protocol)
291				break;
292		}
293		err = -EPROTONOSUPPORT;
294		answer = NULL;
295	}
296
297	if (unlikely(answer == NULL)) {
298		if (try_loading_module < 2) {
299			rcu_read_unlock();
300			/*
301			 * Be more specific, e.g. net-pf-2-proto-132-type-1
302			 * (net-pf-PF_INET-proto-IPPROTO_SCTP-type-SOCK_STREAM)
303			 */
304			if (++try_loading_module == 1)
305				request_module("net-pf-%d-proto-%d-type-%d",
306					       PF_INET, protocol, sock->type);
307			/*
308			 * Fall back to generic, e.g. net-pf-2-proto-132
309			 * (net-pf-PF_INET-proto-IPPROTO_SCTP)
310			 */
311			else
312				request_module("net-pf-%d-proto-%d",
313					       PF_INET, protocol);
314			goto lookup_protocol;
315		} else
316			goto out_rcu_unlock;
317	}
318
319	err = -EPERM;
320	if (answer->capability > 0 && !capable(answer->capability))
321		goto out_rcu_unlock;
322
323	sock->ops = answer->ops;
324	answer_prot = answer->prot;
325	answer_no_check = answer->no_check;
326	answer_flags = answer->flags;
327	rcu_read_unlock();
328
329	BUG_TRAP(answer_prot->slab != NULL);
330
331	err = -ENOBUFS;
332	sk = sk_alloc(net, PF_INET, GFP_KERNEL, answer_prot);
333	if (sk == NULL)
334		goto out;
335
336	err = 0;
337	sk->sk_no_check = answer_no_check;
338	if (INET_PROTOSW_REUSE & answer_flags)
339		sk->sk_reuse = 1;
340
341	inet = inet_sk(sk);
342	inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
343
344	if (SOCK_RAW == sock->type) {
345		inet->num = protocol;
346		if (IPPROTO_RAW == protocol)
347			inet->hdrincl = 1;
348	}
349
350	if (ipv4_config.no_pmtu_disc)
351		inet->pmtudisc = IP_PMTUDISC_DONT;
352	else
353		inet->pmtudisc = IP_PMTUDISC_WANT;
354
355	inet->id = 0;
356
357	sock_init_data(sock, sk);
358
359	sk->sk_destruct	   = inet_sock_destruct;
360	sk->sk_family	   = PF_INET;
361	sk->sk_protocol	   = protocol;
362	sk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
363
364	inet->uc_ttl	= -1;
365	inet->mc_loop	= 1;
366	inet->mc_ttl	= 1;
367	inet->mc_index	= 0;
368	inet->mc_list	= NULL;
369
370	sk_refcnt_debug_inc(sk);
371
372	if (inet->num) {
373		/* It assumes that any protocol which allows
374		 * the user to assign a number at socket
375		 * creation time automatically
376		 * shares.
377		 */
378		inet->sport = htons(inet->num);
379		/* Add to protocol hash chains. */
380		sk->sk_prot->hash(sk);
381	}
382
383	if (sk->sk_prot->init) {
384		err = sk->sk_prot->init(sk);
385		if (err)
386			sk_common_release(sk);
387	}
388out:
389	return err;
390out_rcu_unlock:
391	rcu_read_unlock();
392	goto out;
393}
394
395
396/*
397 *	The peer socket should always be NULL (or else). When we call this
398 *	function we are destroying the object and from then on nobody
399 *	should refer to it.
400 */
401int inet_release(struct socket *sock)
402{
403	struct sock *sk = sock->sk;
404
405	if (sk) {
406		long timeout;
407
408		/* Applications forget to leave groups before exiting */
409		ip_mc_drop_socket(sk);
410
411		/* If linger is set, we don't return until the close
412		 * is complete.  Otherwise we return immediately. The
413		 * actually closing is done the same either way.
414		 *
415		 * If the close is due to the process exiting, we never
416		 * linger..
417		 */
418		timeout = 0;
419		if (sock_flag(sk, SOCK_LINGER) &&
420		    !(current->flags & PF_EXITING))
421			timeout = sk->sk_lingertime;
422		sock->sk = NULL;
423		sk->sk_prot->close(sk, timeout);
424	}
425	return 0;
426}
427
428/* It is off by default, see below. */
429int sysctl_ip_nonlocal_bind __read_mostly;
430
431int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
432{
433	struct sockaddr_in *addr = (struct sockaddr_in *)uaddr;
434	struct sock *sk = sock->sk;
435	struct inet_sock *inet = inet_sk(sk);
436	unsigned short snum;
437	int chk_addr_ret;
438	int err;
439
440	/* If the socket has its own bind function then use it. (RAW) */
441	if (sk->sk_prot->bind) {
442		err = sk->sk_prot->bind(sk, uaddr, addr_len);
443		goto out;
444	}
445	err = -EINVAL;
446	if (addr_len < sizeof(struct sockaddr_in))
447		goto out;
448
449	chk_addr_ret = inet_addr_type(&init_net, addr->sin_addr.s_addr);
450
451	/* Not specified by any standard per-se, however it breaks too
452	 * many applications when removed.  It is unfortunate since
453	 * allowing applications to make a non-local bind solves
454	 * several problems with systems using dynamic addressing.
455	 * (ie. your servers still start up even if your ISDN link
456	 *  is temporarily down)
457	 */
458	err = -EADDRNOTAVAIL;
459	if (!sysctl_ip_nonlocal_bind &&
460	    !inet->freebind &&
461	    addr->sin_addr.s_addr != INADDR_ANY &&
462	    chk_addr_ret != RTN_LOCAL &&
463	    chk_addr_ret != RTN_MULTICAST &&
464	    chk_addr_ret != RTN_BROADCAST)
465		goto out;
466
467	snum = ntohs(addr->sin_port);
468	err = -EACCES;
469	if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
470		goto out;
471
472	/*      We keep a pair of addresses. rcv_saddr is the one
473	 *      used by hash lookups, and saddr is used for transmit.
474	 *
475	 *      In the BSD API these are the same except where it
476	 *      would be illegal to use them (multicast/broadcast) in
477	 *      which case the sending device address is used.
478	 */
479	lock_sock(sk);
480
481	/* Check these errors (active socket, double bind). */
482	err = -EINVAL;
483	if (sk->sk_state != TCP_CLOSE || inet->num)
484		goto out_release_sock;
485
486	inet->rcv_saddr = inet->saddr = addr->sin_addr.s_addr;
487	if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST)
488		inet->saddr = 0;  /* Use device */
489
490	/* Make sure we are allowed to bind here. */
491	if (sk->sk_prot->get_port(sk, snum)) {
492		inet->saddr = inet->rcv_saddr = 0;
493		err = -EADDRINUSE;
494		goto out_release_sock;
495	}
496
497	if (inet->rcv_saddr)
498		sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
499	if (snum)
500		sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
501	inet->sport = htons(inet->num);
502	inet->daddr = 0;
503	inet->dport = 0;
504	sk_dst_reset(sk);
505	err = 0;
506out_release_sock:
507	release_sock(sk);
508out:
509	return err;
510}
511
512int inet_dgram_connect(struct socket *sock, struct sockaddr * uaddr,
513		       int addr_len, int flags)
514{
515	struct sock *sk = sock->sk;
516
517	if (uaddr->sa_family == AF_UNSPEC)
518		return sk->sk_prot->disconnect(sk, flags);
519
520	if (!inet_sk(sk)->num && inet_autobind(sk))
521		return -EAGAIN;
522	return sk->sk_prot->connect(sk, (struct sockaddr *)uaddr, addr_len);
523}
524
525static long inet_wait_for_connect(struct sock *sk, long timeo)
526{
527	DEFINE_WAIT(wait);
528
529	prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
530
531	/* Basic assumption: if someone sets sk->sk_err, he _must_
532	 * change state of the socket from TCP_SYN_*.
533	 * Connect() does not allow to get error notifications
534	 * without closing the socket.
535	 */
536	while ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
537		release_sock(sk);
538		timeo = schedule_timeout(timeo);
539		lock_sock(sk);
540		if (signal_pending(current) || !timeo)
541			break;
542		prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
543	}
544	finish_wait(sk->sk_sleep, &wait);
545	return timeo;
546}
547
548/*
549 *	Connect to a remote host. There is regrettably still a little
550 *	TCP 'magic' in here.
551 */
552int inet_stream_connect(struct socket *sock, struct sockaddr *uaddr,
553			int addr_len, int flags)
554{
555	struct sock *sk = sock->sk;
556	int err;
557	long timeo;
558
559	lock_sock(sk);
560
561	if (uaddr->sa_family == AF_UNSPEC) {
562		err = sk->sk_prot->disconnect(sk, flags);
563		sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED;
564		goto out;
565	}
566
567	switch (sock->state) {
568	default:
569		err = -EINVAL;
570		goto out;
571	case SS_CONNECTED:
572		err = -EISCONN;
573		goto out;
574	case SS_CONNECTING:
575		err = -EALREADY;
576		/* Fall out of switch with err, set for this state */
577		break;
578	case SS_UNCONNECTED:
579		err = -EISCONN;
580		if (sk->sk_state != TCP_CLOSE)
581			goto out;
582
583		err = sk->sk_prot->connect(sk, uaddr, addr_len);
584		if (err < 0)
585			goto out;
586
587		sock->state = SS_CONNECTING;
588
589		/* Just entered SS_CONNECTING state; the only
590		 * difference is that return value in non-blocking
591		 * case is EINPROGRESS, rather than EALREADY.
592		 */
593		err = -EINPROGRESS;
594		break;
595	}
596
597	timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
598
599	if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
600		/* Error code is set above */
601		if (!timeo || !inet_wait_for_connect(sk, timeo))
602			goto out;
603
604		err = sock_intr_errno(timeo);
605		if (signal_pending(current))
606			goto out;
607	}
608
609	/* Connection was closed by RST, timeout, ICMP error
610	 * or another process disconnected us.
611	 */
612	if (sk->sk_state == TCP_CLOSE)
613		goto sock_error;
614
615	/* sk->sk_err may be not zero now, if RECVERR was ordered by user
616	 * and error was received after socket entered established state.
617	 * Hence, it is handled normally after connect() return successfully.
618	 */
619
620	sock->state = SS_CONNECTED;
621	err = 0;
622out:
623	release_sock(sk);
624	return err;
625
626sock_error:
627	err = sock_error(sk) ? : -ECONNABORTED;
628	sock->state = SS_UNCONNECTED;
629	if (sk->sk_prot->disconnect(sk, flags))
630		sock->state = SS_DISCONNECTING;
631	goto out;
632}
633
634/*
635 *	Accept a pending connection. The TCP layer now gives BSD semantics.
636 */
637
638int inet_accept(struct socket *sock, struct socket *newsock, int flags)
639{
640	struct sock *sk1 = sock->sk;
641	int err = -EINVAL;
642	struct sock *sk2 = sk1->sk_prot->accept(sk1, flags, &err);
643
644	if (!sk2)
645		goto do_err;
646
647	lock_sock(sk2);
648
649	BUG_TRAP((1 << sk2->sk_state) &
650		 (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT | TCPF_CLOSE));
651
652	sock_graft(sk2, newsock);
653
654	newsock->state = SS_CONNECTED;
655	err = 0;
656	release_sock(sk2);
657do_err:
658	return err;
659}
660
661
662/*
663 *	This does both peername and sockname.
664 */
665int inet_getname(struct socket *sock, struct sockaddr *uaddr,
666			int *uaddr_len, int peer)
667{
668	struct sock *sk		= sock->sk;
669	struct inet_sock *inet	= inet_sk(sk);
670	struct sockaddr_in *sin	= (struct sockaddr_in *)uaddr;
671
672	sin->sin_family = AF_INET;
673	if (peer) {
674		if (!inet->dport ||
675		    (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
676		     peer == 1))
677			return -ENOTCONN;
678		sin->sin_port = inet->dport;
679		sin->sin_addr.s_addr = inet->daddr;
680	} else {
681		__be32 addr = inet->rcv_saddr;
682		if (!addr)
683			addr = inet->saddr;
684		sin->sin_port = inet->sport;
685		sin->sin_addr.s_addr = addr;
686	}
687	memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
688	*uaddr_len = sizeof(*sin);
689	return 0;
690}
691
692int inet_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg,
693		 size_t size)
694{
695	struct sock *sk = sock->sk;
696
697	/* We may need to bind the socket. */
698	if (!inet_sk(sk)->num && inet_autobind(sk))
699		return -EAGAIN;
700
701	return sk->sk_prot->sendmsg(iocb, sk, msg, size);
702}
703
704
705static ssize_t inet_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
706{
707	struct sock *sk = sock->sk;
708
709	/* We may need to bind the socket. */
710	if (!inet_sk(sk)->num && inet_autobind(sk))
711		return -EAGAIN;
712
713	if (sk->sk_prot->sendpage)
714		return sk->sk_prot->sendpage(sk, page, offset, size, flags);
715	return sock_no_sendpage(sock, page, offset, size, flags);
716}
717
718
719int inet_shutdown(struct socket *sock, int how)
720{
721	struct sock *sk = sock->sk;
722	int err = 0;
723
724	/* This should really check to make sure
725	 * the socket is a TCP socket. (WHY AC...)
726	 */
727	how++; /* maps 0->1 has the advantage of making bit 1 rcvs and
728		       1->2 bit 2 snds.
729		       2->3 */
730	if ((how & ~SHUTDOWN_MASK) || !how)	/* MAXINT->0 */
731		return -EINVAL;
732
733	lock_sock(sk);
734	if (sock->state == SS_CONNECTING) {
735		if ((1 << sk->sk_state) &
736		    (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE))
737			sock->state = SS_DISCONNECTING;
738		else
739			sock->state = SS_CONNECTED;
740	}
741
742	switch (sk->sk_state) {
743	case TCP_CLOSE:
744		err = -ENOTCONN;
745		/* Hack to wake up other listeners, who can poll for
746		   POLLHUP, even on eg. unconnected UDP sockets -- RR */
747	default:
748		sk->sk_shutdown |= how;
749		if (sk->sk_prot->shutdown)
750			sk->sk_prot->shutdown(sk, how);
751		break;
752
753	/* Remaining two branches are temporary solution for missing
754	 * close() in multithreaded environment. It is _not_ a good idea,
755	 * but we have no choice until close() is repaired at VFS level.
756	 */
757	case TCP_LISTEN:
758		if (!(how & RCV_SHUTDOWN))
759			break;
760		/* Fall through */
761	case TCP_SYN_SENT:
762		err = sk->sk_prot->disconnect(sk, O_NONBLOCK);
763		sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED;
764		break;
765	}
766
767	/* Wake up anyone sleeping in poll. */
768	sk->sk_state_change(sk);
769	release_sock(sk);
770	return err;
771}
772
773/*
774 *	ioctl() calls you can issue on an INET socket. Most of these are
775 *	device configuration and stuff and very rarely used. Some ioctls
776 *	pass on to the socket itself.
777 *
778 *	NOTE: I like the idea of a module for the config stuff. ie ifconfig
779 *	loads the devconfigure module does its configuring and unloads it.
780 *	There's a good 20K of config code hanging around the kernel.
781 */
782
783int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
784{
785	struct sock *sk = sock->sk;
786	int err = 0;
787
788	switch (cmd) {
789		case SIOCGSTAMP:
790			err = sock_get_timestamp(sk, (struct timeval __user *)arg);
791			break;
792		case SIOCGSTAMPNS:
793			err = sock_get_timestampns(sk, (struct timespec __user *)arg);
794			break;
795		case SIOCADDRT:
796		case SIOCDELRT:
797		case SIOCRTMSG:
798			err = ip_rt_ioctl(sk->sk_net, cmd, (void __user *)arg);
799			break;
800		case SIOCDARP:
801		case SIOCGARP:
802		case SIOCSARP:
803			err = arp_ioctl(sk->sk_net, cmd, (void __user *)arg);
804			break;
805		case SIOCGIFADDR:
806		case SIOCSIFADDR:
807		case SIOCGIFBRDADDR:
808		case SIOCSIFBRDADDR:
809		case SIOCGIFNETMASK:
810		case SIOCSIFNETMASK:
811		case SIOCGIFDSTADDR:
812		case SIOCSIFDSTADDR:
813		case SIOCSIFPFLAGS:
814		case SIOCGIFPFLAGS:
815		case SIOCSIFFLAGS:
816			err = devinet_ioctl(cmd, (void __user *)arg);
817			break;
818		default:
819			if (sk->sk_prot->ioctl)
820				err = sk->sk_prot->ioctl(sk, cmd, arg);
821			else
822				err = -ENOIOCTLCMD;
823			break;
824	}
825	return err;
826}
827
828const struct proto_ops inet_stream_ops = {
829	.family		   = PF_INET,
830	.owner		   = THIS_MODULE,
831	.release	   = inet_release,
832	.bind		   = inet_bind,
833	.connect	   = inet_stream_connect,
834	.socketpair	   = sock_no_socketpair,
835	.accept		   = inet_accept,
836	.getname	   = inet_getname,
837	.poll		   = tcp_poll,
838	.ioctl		   = inet_ioctl,
839	.listen		   = inet_listen,
840	.shutdown	   = inet_shutdown,
841	.setsockopt	   = sock_common_setsockopt,
842	.getsockopt	   = sock_common_getsockopt,
843	.sendmsg	   = tcp_sendmsg,
844	.recvmsg	   = sock_common_recvmsg,
845	.mmap		   = sock_no_mmap,
846	.sendpage	   = tcp_sendpage,
847	.splice_read	   = tcp_splice_read,
848#ifdef CONFIG_COMPAT
849	.compat_setsockopt = compat_sock_common_setsockopt,
850	.compat_getsockopt = compat_sock_common_getsockopt,
851#endif
852};
853
854const struct proto_ops inet_dgram_ops = {
855	.family		   = PF_INET,
856	.owner		   = THIS_MODULE,
857	.release	   = inet_release,
858	.bind		   = inet_bind,
859	.connect	   = inet_dgram_connect,
860	.socketpair	   = sock_no_socketpair,
861	.accept		   = sock_no_accept,
862	.getname	   = inet_getname,
863	.poll		   = udp_poll,
864	.ioctl		   = inet_ioctl,
865	.listen		   = sock_no_listen,
866	.shutdown	   = inet_shutdown,
867	.setsockopt	   = sock_common_setsockopt,
868	.getsockopt	   = sock_common_getsockopt,
869	.sendmsg	   = inet_sendmsg,
870	.recvmsg	   = sock_common_recvmsg,
871	.mmap		   = sock_no_mmap,
872	.sendpage	   = inet_sendpage,
873#ifdef CONFIG_COMPAT
874	.compat_setsockopt = compat_sock_common_setsockopt,
875	.compat_getsockopt = compat_sock_common_getsockopt,
876#endif
877};
878
879/*
880 * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without
881 * udp_poll
882 */
883static const struct proto_ops inet_sockraw_ops = {
884	.family		   = PF_INET,
885	.owner		   = THIS_MODULE,
886	.release	   = inet_release,
887	.bind		   = inet_bind,
888	.connect	   = inet_dgram_connect,
889	.socketpair	   = sock_no_socketpair,
890	.accept		   = sock_no_accept,
891	.getname	   = inet_getname,
892	.poll		   = datagram_poll,
893	.ioctl		   = inet_ioctl,
894	.listen		   = sock_no_listen,
895	.shutdown	   = inet_shutdown,
896	.setsockopt	   = sock_common_setsockopt,
897	.getsockopt	   = sock_common_getsockopt,
898	.sendmsg	   = inet_sendmsg,
899	.recvmsg	   = sock_common_recvmsg,
900	.mmap		   = sock_no_mmap,
901	.sendpage	   = inet_sendpage,
902#ifdef CONFIG_COMPAT
903	.compat_setsockopt = compat_sock_common_setsockopt,
904	.compat_getsockopt = compat_sock_common_getsockopt,
905#endif
906};
907
908static struct net_proto_family inet_family_ops = {
909	.family = PF_INET,
910	.create = inet_create,
911	.owner	= THIS_MODULE,
912};
913
914/* Upon startup we insert all the elements in inetsw_array[] into
915 * the linked list inetsw.
916 */
917static struct inet_protosw inetsw_array[] =
918{
919	{
920		.type =       SOCK_STREAM,
921		.protocol =   IPPROTO_TCP,
922		.prot =       &tcp_prot,
923		.ops =        &inet_stream_ops,
924		.capability = -1,
925		.no_check =   0,
926		.flags =      INET_PROTOSW_PERMANENT |
927			      INET_PROTOSW_ICSK,
928	},
929
930	{
931		.type =       SOCK_DGRAM,
932		.protocol =   IPPROTO_UDP,
933		.prot =       &udp_prot,
934		.ops =        &inet_dgram_ops,
935		.capability = -1,
936		.no_check =   UDP_CSUM_DEFAULT,
937		.flags =      INET_PROTOSW_PERMANENT,
938       },
939
940
941       {
942	       .type =       SOCK_RAW,
943	       .protocol =   IPPROTO_IP,	/* wild card */
944	       .prot =       &raw_prot,
945	       .ops =        &inet_sockraw_ops,
946	       .capability = CAP_NET_RAW,
947	       .no_check =   UDP_CSUM_DEFAULT,
948	       .flags =      INET_PROTOSW_REUSE,
949       }
950};
951
952#define INETSW_ARRAY_LEN ARRAY_SIZE(inetsw_array)
953
954void inet_register_protosw(struct inet_protosw *p)
955{
956	struct list_head *lh;
957	struct inet_protosw *answer;
958	int protocol = p->protocol;
959	struct list_head *last_perm;
960
961	spin_lock_bh(&inetsw_lock);
962
963	if (p->type >= SOCK_MAX)
964		goto out_illegal;
965
966	/* If we are trying to override a permanent protocol, bail. */
967	answer = NULL;
968	last_perm = &inetsw[p->type];
969	list_for_each(lh, &inetsw[p->type]) {
970		answer = list_entry(lh, struct inet_protosw, list);
971
972		/* Check only the non-wild match. */
973		if (INET_PROTOSW_PERMANENT & answer->flags) {
974			if (protocol == answer->protocol)
975				break;
976			last_perm = lh;
977		}
978
979		answer = NULL;
980	}
981	if (answer)
982		goto out_permanent;
983
984	/* Add the new entry after the last permanent entry if any, so that
985	 * the new entry does not override a permanent entry when matched with
986	 * a wild-card protocol. But it is allowed to override any existing
987	 * non-permanent entry.  This means that when we remove this entry, the
988	 * system automatically returns to the old behavior.
989	 */
990	list_add_rcu(&p->list, last_perm);
991out:
992	spin_unlock_bh(&inetsw_lock);
993
994	synchronize_net();
995
996	return;
997
998out_permanent:
999	printk(KERN_ERR "Attempt to override permanent protocol %d.\n",
1000	       protocol);
1001	goto out;
1002
1003out_illegal:
1004	printk(KERN_ERR
1005	       "Ignoring attempt to register invalid socket type %d.\n",
1006	       p->type);
1007	goto out;
1008}
1009
1010void inet_unregister_protosw(struct inet_protosw *p)
1011{
1012	if (INET_PROTOSW_PERMANENT & p->flags) {
1013		printk(KERN_ERR
1014		       "Attempt to unregister permanent protocol %d.\n",
1015		       p->protocol);
1016	} else {
1017		spin_lock_bh(&inetsw_lock);
1018		list_del_rcu(&p->list);
1019		spin_unlock_bh(&inetsw_lock);
1020
1021		synchronize_net();
1022	}
1023}
1024
1025/*
1026 *      Shall we try to damage output packets if routing dev changes?
1027 */
1028
1029int sysctl_ip_dynaddr __read_mostly;
1030
1031static int inet_sk_reselect_saddr(struct sock *sk)
1032{
1033	struct inet_sock *inet = inet_sk(sk);
1034	int err;
1035	struct rtable *rt;
1036	__be32 old_saddr = inet->saddr;
1037	__be32 new_saddr;
1038	__be32 daddr = inet->daddr;
1039
1040	if (inet->opt && inet->opt->srr)
1041		daddr = inet->opt->faddr;
1042
1043	/* Query new route. */
1044	err = ip_route_connect(&rt, daddr, 0,
1045			       RT_CONN_FLAGS(sk),
1046			       sk->sk_bound_dev_if,
1047			       sk->sk_protocol,
1048			       inet->sport, inet->dport, sk, 0);
1049	if (err)
1050		return err;
1051
1052	sk_setup_caps(sk, &rt->u.dst);
1053
1054	new_saddr = rt->rt_src;
1055
1056	if (new_saddr == old_saddr)
1057		return 0;
1058
1059	if (sysctl_ip_dynaddr > 1) {
1060		printk(KERN_INFO "%s(): shifting inet->"
1061				 "saddr from %d.%d.%d.%d to %d.%d.%d.%d\n",
1062		       __FUNCTION__,
1063		       NIPQUAD(old_saddr),
1064		       NIPQUAD(new_saddr));
1065	}
1066
1067	inet->saddr = inet->rcv_saddr = new_saddr;
1068
1069	/*
1070	 * XXX The only one ugly spot where we need to
1071	 * XXX really change the sockets identity after
1072	 * XXX it has entered the hashes. -DaveM
1073	 *
1074	 * Besides that, it does not check for connection
1075	 * uniqueness. Wait for troubles.
1076	 */
1077	__sk_prot_rehash(sk);
1078	return 0;
1079}
1080
1081int inet_sk_rebuild_header(struct sock *sk)
1082{
1083	struct inet_sock *inet = inet_sk(sk);
1084	struct rtable *rt = (struct rtable *)__sk_dst_check(sk, 0);
1085	__be32 daddr;
1086	int err;
1087
1088	/* Route is OK, nothing to do. */
1089	if (rt)
1090		return 0;
1091
1092	/* Reroute. */
1093	daddr = inet->daddr;
1094	if (inet->opt && inet->opt->srr)
1095		daddr = inet->opt->faddr;
1096{
1097	struct flowi fl = {
1098		.oif = sk->sk_bound_dev_if,
1099		.nl_u = {
1100			.ip4_u = {
1101				.daddr	= daddr,
1102				.saddr	= inet->saddr,
1103				.tos	= RT_CONN_FLAGS(sk),
1104			},
1105		},
1106		.proto = sk->sk_protocol,
1107		.uli_u = {
1108			.ports = {
1109				.sport = inet->sport,
1110				.dport = inet->dport,
1111			},
1112		},
1113	};
1114
1115	security_sk_classify_flow(sk, &fl);
1116	err = ip_route_output_flow(&init_net, &rt, &fl, sk, 0);
1117}
1118	if (!err)
1119		sk_setup_caps(sk, &rt->u.dst);
1120	else {
1121		/* Routing failed... */
1122		sk->sk_route_caps = 0;
1123		/*
1124		 * Other protocols have to map its equivalent state to TCP_SYN_SENT.
1125		 * DCCP maps its DCCP_REQUESTING state to TCP_SYN_SENT. -acme
1126		 */
1127		if (!sysctl_ip_dynaddr ||
1128		    sk->sk_state != TCP_SYN_SENT ||
1129		    (sk->sk_userlocks & SOCK_BINDADDR_LOCK) ||
1130		    (err = inet_sk_reselect_saddr(sk)) != 0)
1131			sk->sk_err_soft = -err;
1132	}
1133
1134	return err;
1135}
1136
1137EXPORT_SYMBOL(inet_sk_rebuild_header);
1138
1139static int inet_gso_send_check(struct sk_buff *skb)
1140{
1141	struct iphdr *iph;
1142	struct net_protocol *ops;
1143	int proto;
1144	int ihl;
1145	int err = -EINVAL;
1146
1147	if (unlikely(!pskb_may_pull(skb, sizeof(*iph))))
1148		goto out;
1149
1150	iph = ip_hdr(skb);
1151	ihl = iph->ihl * 4;
1152	if (ihl < sizeof(*iph))
1153		goto out;
1154
1155	if (unlikely(!pskb_may_pull(skb, ihl)))
1156		goto out;
1157
1158	__skb_pull(skb, ihl);
1159	skb_reset_transport_header(skb);
1160	iph = ip_hdr(skb);
1161	proto = iph->protocol & (MAX_INET_PROTOS - 1);
1162	err = -EPROTONOSUPPORT;
1163
1164	rcu_read_lock();
1165	ops = rcu_dereference(inet_protos[proto]);
1166	if (likely(ops && ops->gso_send_check))
1167		err = ops->gso_send_check(skb);
1168	rcu_read_unlock();
1169
1170out:
1171	return err;
1172}
1173
1174static struct sk_buff *inet_gso_segment(struct sk_buff *skb, int features)
1175{
1176	struct sk_buff *segs = ERR_PTR(-EINVAL);
1177	struct iphdr *iph;
1178	struct net_protocol *ops;
1179	int proto;
1180	int ihl;
1181	int id;
1182
1183	if (!(features & NETIF_F_V4_CSUM))
1184		features &= ~NETIF_F_SG;
1185
1186	if (unlikely(skb_shinfo(skb)->gso_type &
1187		     ~(SKB_GSO_TCPV4 |
1188		       SKB_GSO_UDP |
1189		       SKB_GSO_DODGY |
1190		       SKB_GSO_TCP_ECN |
1191		       0)))
1192		goto out;
1193
1194	if (unlikely(!pskb_may_pull(skb, sizeof(*iph))))
1195		goto out;
1196
1197	iph = ip_hdr(skb);
1198	ihl = iph->ihl * 4;
1199	if (ihl < sizeof(*iph))
1200		goto out;
1201
1202	if (unlikely(!pskb_may_pull(skb, ihl)))
1203		goto out;
1204
1205	__skb_pull(skb, ihl);
1206	skb_reset_transport_header(skb);
1207	iph = ip_hdr(skb);
1208	id = ntohs(iph->id);
1209	proto = iph->protocol & (MAX_INET_PROTOS - 1);
1210	segs = ERR_PTR(-EPROTONOSUPPORT);
1211
1212	rcu_read_lock();
1213	ops = rcu_dereference(inet_protos[proto]);
1214	if (likely(ops && ops->gso_segment))
1215		segs = ops->gso_segment(skb, features);
1216	rcu_read_unlock();
1217
1218	if (!segs || unlikely(IS_ERR(segs)))
1219		goto out;
1220
1221	skb = segs;
1222	do {
1223		iph = ip_hdr(skb);
1224		iph->id = htons(id++);
1225		iph->tot_len = htons(skb->len - skb->mac_len);
1226		iph->check = 0;
1227		iph->check = ip_fast_csum(skb_network_header(skb), iph->ihl);
1228	} while ((skb = skb->next));
1229
1230out:
1231	return segs;
1232}
1233
1234unsigned long snmp_fold_field(void *mib[], int offt)
1235{
1236	unsigned long res = 0;
1237	int i;
1238
1239	for_each_possible_cpu(i) {
1240		res += *(((unsigned long *) per_cpu_ptr(mib[0], i)) + offt);
1241		res += *(((unsigned long *) per_cpu_ptr(mib[1], i)) + offt);
1242	}
1243	return res;
1244}
1245EXPORT_SYMBOL_GPL(snmp_fold_field);
1246
1247int snmp_mib_init(void *ptr[2], size_t mibsize)
1248{
1249	BUG_ON(ptr == NULL);
1250	ptr[0] = __alloc_percpu(mibsize);
1251	if (!ptr[0])
1252		goto err0;
1253	ptr[1] = __alloc_percpu(mibsize);
1254	if (!ptr[1])
1255		goto err1;
1256	return 0;
1257err1:
1258	free_percpu(ptr[0]);
1259	ptr[0] = NULL;
1260err0:
1261	return -ENOMEM;
1262}
1263EXPORT_SYMBOL_GPL(snmp_mib_init);
1264
1265void snmp_mib_free(void *ptr[2])
1266{
1267	BUG_ON(ptr == NULL);
1268	free_percpu(ptr[0]);
1269	free_percpu(ptr[1]);
1270	ptr[0] = ptr[1] = NULL;
1271}
1272EXPORT_SYMBOL_GPL(snmp_mib_free);
1273
1274#ifdef CONFIG_IP_MULTICAST
1275static struct net_protocol igmp_protocol = {
1276	.handler =	igmp_rcv,
1277};
1278#endif
1279
1280static struct net_protocol tcp_protocol = {
1281	.handler =	tcp_v4_rcv,
1282	.err_handler =	tcp_v4_err,
1283	.gso_send_check = tcp_v4_gso_send_check,
1284	.gso_segment =	tcp_tso_segment,
1285	.no_policy =	1,
1286};
1287
1288static struct net_protocol udp_protocol = {
1289	.handler =	udp_rcv,
1290	.err_handler =	udp_err,
1291	.no_policy =	1,
1292};
1293
1294static struct net_protocol icmp_protocol = {
1295	.handler =	icmp_rcv,
1296	.no_policy =	1,
1297};
1298
1299static int __init init_ipv4_mibs(void)
1300{
1301	if (snmp_mib_init((void **)net_statistics,
1302			  sizeof(struct linux_mib)) < 0)
1303		goto err_net_mib;
1304	if (snmp_mib_init((void **)ip_statistics,
1305			  sizeof(struct ipstats_mib)) < 0)
1306		goto err_ip_mib;
1307	if (snmp_mib_init((void **)icmp_statistics,
1308			  sizeof(struct icmp_mib)) < 0)
1309		goto err_icmp_mib;
1310	if (snmp_mib_init((void **)icmpmsg_statistics,
1311			  sizeof(struct icmpmsg_mib)) < 0)
1312		goto err_icmpmsg_mib;
1313	if (snmp_mib_init((void **)tcp_statistics,
1314			  sizeof(struct tcp_mib)) < 0)
1315		goto err_tcp_mib;
1316	if (snmp_mib_init((void **)udp_statistics,
1317			  sizeof(struct udp_mib)) < 0)
1318		goto err_udp_mib;
1319	if (snmp_mib_init((void **)udplite_statistics,
1320			  sizeof(struct udp_mib)) < 0)
1321		goto err_udplite_mib;
1322
1323	tcp_mib_init();
1324
1325	return 0;
1326
1327err_udplite_mib:
1328	snmp_mib_free((void **)udp_statistics);
1329err_udp_mib:
1330	snmp_mib_free((void **)tcp_statistics);
1331err_tcp_mib:
1332	snmp_mib_free((void **)icmpmsg_statistics);
1333err_icmpmsg_mib:
1334	snmp_mib_free((void **)icmp_statistics);
1335err_icmp_mib:
1336	snmp_mib_free((void **)ip_statistics);
1337err_ip_mib:
1338	snmp_mib_free((void **)net_statistics);
1339err_net_mib:
1340	return -ENOMEM;
1341}
1342
1343static int ipv4_proc_init(void);
1344
1345/*
1346 *	IP protocol layer initialiser
1347 */
1348
1349static struct packet_type ip_packet_type = {
1350	.type = __constant_htons(ETH_P_IP),
1351	.func = ip_rcv,
1352	.gso_send_check = inet_gso_send_check,
1353	.gso_segment = inet_gso_segment,
1354};
1355
1356static int __init inet_init(void)
1357{
1358	struct sk_buff *dummy_skb;
1359	struct inet_protosw *q;
1360	struct list_head *r;
1361	int rc = -EINVAL;
1362
1363	BUILD_BUG_ON(sizeof(struct inet_skb_parm) > sizeof(dummy_skb->cb));
1364
1365	rc = proto_register(&tcp_prot, 1);
1366	if (rc)
1367		goto out;
1368
1369	rc = proto_register(&udp_prot, 1);
1370	if (rc)
1371		goto out_unregister_tcp_proto;
1372
1373	rc = proto_register(&raw_prot, 1);
1374	if (rc)
1375		goto out_unregister_udp_proto;
1376
1377	/*
1378	 *	Tell SOCKET that we are alive...
1379	 */
1380
1381	(void)sock_register(&inet_family_ops);
1382
1383	/*
1384	 *	Add all the base protocols.
1385	 */
1386
1387	if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0)
1388		printk(KERN_CRIT "inet_init: Cannot add ICMP protocol\n");
1389	if (inet_add_protocol(&udp_protocol, IPPROTO_UDP) < 0)
1390		printk(KERN_CRIT "inet_init: Cannot add UDP protocol\n");
1391	if (inet_add_protocol(&tcp_protocol, IPPROTO_TCP) < 0)
1392		printk(KERN_CRIT "inet_init: Cannot add TCP protocol\n");
1393#ifdef CONFIG_IP_MULTICAST
1394	if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0)
1395		printk(KERN_CRIT "inet_init: Cannot add IGMP protocol\n");
1396#endif
1397
1398	/* Register the socket-side information for inet_create. */
1399	for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r)
1400		INIT_LIST_HEAD(r);
1401
1402	for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q)
1403		inet_register_protosw(q);
1404
1405	/*
1406	 *	Set the ARP module up
1407	 */
1408
1409	arp_init();
1410
1411	/*
1412	 *	Set the IP module up
1413	 */
1414
1415	ip_init();
1416
1417	tcp_v4_init(&inet_family_ops);
1418
1419	/* Setup TCP slab cache for open requests. */
1420	tcp_init();
1421
1422	/* Setup UDP memory threshold */
1423	udp_init();
1424
1425	/* Add UDP-Lite (RFC 3828) */
1426	udplite4_register();
1427
1428	/*
1429	 *	Set the ICMP layer up
1430	 */
1431
1432	icmp_init(&inet_family_ops);
1433
1434	/*
1435	 *	Initialise the multicast router
1436	 */
1437#if defined(CONFIG_IP_MROUTE)
1438	ip_mr_init();
1439#endif
1440	/*
1441	 *	Initialise per-cpu ipv4 mibs
1442	 */
1443
1444	if (init_ipv4_mibs())
1445		printk(KERN_CRIT "inet_init: Cannot init ipv4 mibs\n"); ;
1446
1447	ipv4_proc_init();
1448
1449	ipfrag_init();
1450
1451	dev_add_pack(&ip_packet_type);
1452
1453	rc = 0;
1454out:
1455	return rc;
1456out_unregister_udp_proto:
1457	proto_unregister(&udp_prot);
1458out_unregister_tcp_proto:
1459	proto_unregister(&tcp_prot);
1460	goto out;
1461}
1462
1463fs_initcall(inet_init);
1464
1465/* ------------------------------------------------------------------------ */
1466
1467#ifdef CONFIG_PROC_FS
1468static int __init ipv4_proc_init(void)
1469{
1470	int rc = 0;
1471
1472	if (raw_proc_init())
1473		goto out_raw;
1474	if (tcp4_proc_init())
1475		goto out_tcp;
1476	if (udp4_proc_init())
1477		goto out_udp;
1478	if (ip_misc_proc_init())
1479		goto out_misc;
1480out:
1481	return rc;
1482out_misc:
1483	udp4_proc_exit();
1484out_udp:
1485	tcp4_proc_exit();
1486out_tcp:
1487	raw_proc_exit();
1488out_raw:
1489	rc = -ENOMEM;
1490	goto out;
1491}
1492
1493#else /* CONFIG_PROC_FS */
1494static int __init ipv4_proc_init(void)
1495{
1496	return 0;
1497}
1498#endif /* CONFIG_PROC_FS */
1499
1500MODULE_ALIAS_NETPROTO(PF_INET);
1501
1502EXPORT_SYMBOL(inet_accept);
1503EXPORT_SYMBOL(inet_bind);
1504EXPORT_SYMBOL(inet_dgram_connect);
1505EXPORT_SYMBOL(inet_dgram_ops);
1506EXPORT_SYMBOL(inet_getname);
1507EXPORT_SYMBOL(inet_ioctl);
1508EXPORT_SYMBOL(inet_listen);
1509EXPORT_SYMBOL(inet_register_protosw);
1510EXPORT_SYMBOL(inet_release);
1511EXPORT_SYMBOL(inet_sendmsg);
1512EXPORT_SYMBOL(inet_shutdown);
1513EXPORT_SYMBOL(inet_sock_destruct);
1514EXPORT_SYMBOL(inet_stream_connect);
1515EXPORT_SYMBOL(inet_stream_ops);
1516EXPORT_SYMBOL(inet_unregister_protosw);
1517EXPORT_SYMBOL(net_statistics);
1518EXPORT_SYMBOL(sysctl_ip_nonlocal_bind);
1519