af_inet.c revision c82838458200ec4167ce7083b0a17474150c5bf7
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 * Authors:	Ross Biro
9 *		Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
10 *		Florian La Roche, <flla@stud.uni-sb.de>
11 *		Alan Cox, <A.Cox@swansea.ac.uk>
12 *
13 * Changes (see also sock.c)
14 *
15 *		piggy,
16 *		Karl Knutson	:	Socket protocol table
17 *		A.N.Kuznetsov	:	Socket death error in accept().
18 *		John Richardson :	Fix non blocking error in connect()
19 *					so sockets that fail to connect
20 *					don't return -EINPROGRESS.
21 *		Alan Cox	:	Asynchronous I/O support
22 *		Alan Cox	:	Keep correct socket pointer on sock
23 *					structures
24 *					when accept() ed
25 *		Alan Cox	:	Semantics of SO_LINGER aren't state
26 *					moved to close when you look carefully.
27 *					With this fixed and the accept bug fixed
28 *					some RPC stuff seems happier.
29 *		Niibe Yutaka	:	4.4BSD style write async I/O
30 *		Alan Cox,
31 *		Tony Gale 	:	Fixed reuse semantics.
32 *		Alan Cox	:	bind() shouldn't abort existing but dead
33 *					sockets. Stops FTP netin:.. I hope.
34 *		Alan Cox	:	bind() works correctly for RAW sockets.
35 *					Note that FreeBSD at least was broken
36 *					in this respect so be careful with
37 *					compatibility tests...
38 *		Alan Cox	:	routing cache support
39 *		Alan Cox	:	memzero the socket structure for
40 *					compactness.
41 *		Matt Day	:	nonblock connect error handler
42 *		Alan Cox	:	Allow large numbers of pending sockets
43 *					(eg for big web sites), but only if
44 *					specifically application requested.
45 *		Alan Cox	:	New buffering throughout IP. Used
46 *					dumbly.
47 *		Alan Cox	:	New buffering now used smartly.
48 *		Alan Cox	:	BSD rather than common sense
49 *					interpretation of listen.
50 *		Germano Caronni	:	Assorted small races.
51 *		Alan Cox	:	sendmsg/recvmsg basic support.
52 *		Alan Cox	:	Only sendmsg/recvmsg now supported.
53 *		Alan Cox	:	Locked down bind (see security list).
54 *		Alan Cox	:	Loosened bind a little.
55 *		Mike McLagan	:	ADD/DEL DLCI Ioctls
56 *	Willy Konynenberg	:	Transparent proxying support.
57 *		David S. Miller	:	New socket lookup architecture.
58 *					Some other random speedups.
59 *		Cyrus Durgin	:	Cleaned up file for kmod hacks.
60 *		Andi Kleen	:	Fix inet_stream_connect TCP race.
61 *
62 *		This program is free software; you can redistribute it and/or
63 *		modify it under the terms of the GNU General Public License
64 *		as published by the Free Software Foundation; either version
65 *		2 of the License, or (at your option) any later version.
66 */
67
68#include <linux/err.h>
69#include <linux/errno.h>
70#include <linux/types.h>
71#include <linux/socket.h>
72#include <linux/in.h>
73#include <linux/kernel.h>
74#include <linux/module.h>
75#include <linux/sched.h>
76#include <linux/timer.h>
77#include <linux/string.h>
78#include <linux/sockios.h>
79#include <linux/net.h>
80#include <linux/capability.h>
81#include <linux/fcntl.h>
82#include <linux/mm.h>
83#include <linux/interrupt.h>
84#include <linux/stat.h>
85#include <linux/init.h>
86#include <linux/poll.h>
87#include <linux/netfilter_ipv4.h>
88#include <linux/random.h>
89
90#include <asm/uaccess.h>
91#include <asm/system.h>
92
93#include <linux/inet.h>
94#include <linux/igmp.h>
95#include <linux/inetdevice.h>
96#include <linux/netdevice.h>
97#include <net/ip.h>
98#include <net/protocol.h>
99#include <net/arp.h>
100#include <net/route.h>
101#include <net/ip_fib.h>
102#include <net/inet_connection_sock.h>
103#include <net/tcp.h>
104#include <net/udp.h>
105#include <net/udplite.h>
106#include <linux/skbuff.h>
107#include <net/sock.h>
108#include <net/raw.h>
109#include <net/icmp.h>
110#include <net/ipip.h>
111#include <net/inet_common.h>
112#include <net/xfrm.h>
113#include <net/net_namespace.h>
114#ifdef CONFIG_IP_MROUTE
115#include <linux/mroute.h>
116#endif
117
118extern void ip_mc_drop_socket(struct sock *sk);
119
120/* The inetsw table contains everything that inet_create needs to
121 * build a new socket.
122 */
123static struct list_head inetsw[SOCK_MAX];
124static DEFINE_SPINLOCK(inetsw_lock);
125
126struct ipv4_config ipv4_config;
127
128EXPORT_SYMBOL(ipv4_config);
129
130/* New destruction routine */
131
132void inet_sock_destruct(struct sock *sk)
133{
134	struct inet_sock *inet = inet_sk(sk);
135
136	__skb_queue_purge(&sk->sk_receive_queue);
137	__skb_queue_purge(&sk->sk_error_queue);
138
139	sk_mem_reclaim(sk);
140
141	if (sk->sk_type == SOCK_STREAM && sk->sk_state != TCP_CLOSE) {
142		printk("Attempt to release TCP socket in state %d %p\n",
143		       sk->sk_state, sk);
144		return;
145	}
146	if (!sock_flag(sk, SOCK_DEAD)) {
147		printk("Attempt to release alive inet socket %p\n", sk);
148		return;
149	}
150
151	WARN_ON(atomic_read(&sk->sk_rmem_alloc));
152	WARN_ON(atomic_read(&sk->sk_wmem_alloc));
153	WARN_ON(sk->sk_wmem_queued);
154	WARN_ON(sk->sk_forward_alloc);
155
156	kfree(inet->opt);
157	dst_release(sk->sk_dst_cache);
158	sk_refcnt_debug_dec(sk);
159}
160
161/*
162 *	The routines beyond this point handle the behaviour of an AF_INET
163 *	socket object. Mostly it punts to the subprotocols of IP to do
164 *	the work.
165 */
166
167/*
168 *	Automatically bind an unbound socket.
169 */
170
171static int inet_autobind(struct sock *sk)
172{
173	struct inet_sock *inet;
174	/* We may need to bind the socket. */
175	lock_sock(sk);
176	inet = inet_sk(sk);
177	if (!inet->num) {
178		if (sk->sk_prot->get_port(sk, 0)) {
179			release_sock(sk);
180			return -EAGAIN;
181		}
182		inet->sport = htons(inet->num);
183	}
184	release_sock(sk);
185	return 0;
186}
187
188/*
189 *	Move a socket into listening state.
190 */
191int inet_listen(struct socket *sock, int backlog)
192{
193	struct sock *sk = sock->sk;
194	unsigned char old_state;
195	int err;
196
197	lock_sock(sk);
198
199	err = -EINVAL;
200	if (sock->state != SS_UNCONNECTED || sock->type != SOCK_STREAM)
201		goto out;
202
203	old_state = sk->sk_state;
204	if (!((1 << old_state) & (TCPF_CLOSE | TCPF_LISTEN)))
205		goto out;
206
207	/* Really, if the socket is already in listen state
208	 * we can only allow the backlog to be adjusted.
209	 */
210	if (old_state != TCP_LISTEN) {
211		err = inet_csk_listen_start(sk, backlog);
212		if (err)
213			goto out;
214	}
215	sk->sk_max_ack_backlog = backlog;
216	err = 0;
217
218out:
219	release_sock(sk);
220	return err;
221}
222
223u32 inet_ehash_secret __read_mostly;
224EXPORT_SYMBOL(inet_ehash_secret);
225
226/*
227 * inet_ehash_secret must be set exactly once
228 * Instead of using a dedicated spinlock, we (ab)use inetsw_lock
229 */
230void build_ehash_secret(void)
231{
232	u32 rnd;
233	do {
234		get_random_bytes(&rnd, sizeof(rnd));
235	} while (rnd == 0);
236	spin_lock_bh(&inetsw_lock);
237	if (!inet_ehash_secret)
238		inet_ehash_secret = rnd;
239	spin_unlock_bh(&inetsw_lock);
240}
241EXPORT_SYMBOL(build_ehash_secret);
242
243static inline int inet_netns_ok(struct net *net, int protocol)
244{
245	int hash;
246	struct net_protocol *ipprot;
247
248	if (net == &init_net)
249		return 1;
250
251	hash = protocol & (MAX_INET_PROTOS - 1);
252	ipprot = rcu_dereference(inet_protos[hash]);
253
254	if (ipprot == NULL)
255		/* raw IP is OK */
256		return 1;
257	return ipprot->netns_ok;
258}
259
260/*
261 *	Create an inet socket.
262 */
263
264static int inet_create(struct net *net, struct socket *sock, int protocol)
265{
266	struct sock *sk;
267	struct inet_protosw *answer;
268	struct inet_sock *inet;
269	struct proto *answer_prot;
270	unsigned char answer_flags;
271	char answer_no_check;
272	int try_loading_module = 0;
273	int err;
274
275	if (sock->type != SOCK_RAW &&
276	    sock->type != SOCK_DGRAM &&
277	    !inet_ehash_secret)
278		build_ehash_secret();
279
280	sock->state = SS_UNCONNECTED;
281
282	/* Look for the requested type/protocol pair. */
283lookup_protocol:
284	err = -ESOCKTNOSUPPORT;
285	rcu_read_lock();
286	list_for_each_entry_rcu(answer, &inetsw[sock->type], list) {
287
288		err = 0;
289		/* Check the non-wild match. */
290		if (protocol == answer->protocol) {
291			if (protocol != IPPROTO_IP)
292				break;
293		} else {
294			/* Check for the two wild cases. */
295			if (IPPROTO_IP == protocol) {
296				protocol = answer->protocol;
297				break;
298			}
299			if (IPPROTO_IP == answer->protocol)
300				break;
301		}
302		err = -EPROTONOSUPPORT;
303	}
304
305	if (unlikely(err)) {
306		if (try_loading_module < 2) {
307			rcu_read_unlock();
308			/*
309			 * Be more specific, e.g. net-pf-2-proto-132-type-1
310			 * (net-pf-PF_INET-proto-IPPROTO_SCTP-type-SOCK_STREAM)
311			 */
312			if (++try_loading_module == 1)
313				request_module("net-pf-%d-proto-%d-type-%d",
314					       PF_INET, protocol, sock->type);
315			/*
316			 * Fall back to generic, e.g. net-pf-2-proto-132
317			 * (net-pf-PF_INET-proto-IPPROTO_SCTP)
318			 */
319			else
320				request_module("net-pf-%d-proto-%d",
321					       PF_INET, protocol);
322			goto lookup_protocol;
323		} else
324			goto out_rcu_unlock;
325	}
326
327	err = -EPERM;
328	if (answer->capability > 0 && !capable(answer->capability))
329		goto out_rcu_unlock;
330
331	err = -EAFNOSUPPORT;
332	if (!inet_netns_ok(net, protocol))
333		goto out_rcu_unlock;
334
335	sock->ops = answer->ops;
336	answer_prot = answer->prot;
337	answer_no_check = answer->no_check;
338	answer_flags = answer->flags;
339	rcu_read_unlock();
340
341	WARN_ON(answer_prot->slab == NULL);
342
343	err = -ENOBUFS;
344	sk = sk_alloc(net, PF_INET, GFP_KERNEL, answer_prot);
345	if (sk == NULL)
346		goto out;
347
348	err = 0;
349	sk->sk_no_check = answer_no_check;
350	if (INET_PROTOSW_REUSE & answer_flags)
351		sk->sk_reuse = 1;
352
353	inet = inet_sk(sk);
354	inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
355
356	if (SOCK_RAW == sock->type) {
357		inet->num = protocol;
358		if (IPPROTO_RAW == protocol)
359			inet->hdrincl = 1;
360	}
361
362	if (ipv4_config.no_pmtu_disc)
363		inet->pmtudisc = IP_PMTUDISC_DONT;
364	else
365		inet->pmtudisc = IP_PMTUDISC_WANT;
366
367	inet->id = 0;
368
369	sock_init_data(sock, sk);
370
371	sk->sk_destruct	   = inet_sock_destruct;
372	sk->sk_family	   = PF_INET;
373	sk->sk_protocol	   = protocol;
374	sk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
375
376	inet->uc_ttl	= -1;
377	inet->mc_loop	= 1;
378	inet->mc_ttl	= 1;
379	inet->mc_index	= 0;
380	inet->mc_list	= NULL;
381
382	sk_refcnt_debug_inc(sk);
383
384	if (inet->num) {
385		/* It assumes that any protocol which allows
386		 * the user to assign a number at socket
387		 * creation time automatically
388		 * shares.
389		 */
390		inet->sport = htons(inet->num);
391		/* Add to protocol hash chains. */
392		sk->sk_prot->hash(sk);
393	}
394
395	if (sk->sk_prot->init) {
396		err = sk->sk_prot->init(sk);
397		if (err)
398			sk_common_release(sk);
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		/* Applications forget to leave groups before exiting */
421		ip_mc_drop_socket(sk);
422
423		/* If linger is set, we don't return until the close
424		 * is complete.  Otherwise we return immediately. The
425		 * actually closing is done the same either way.
426		 *
427		 * If the close is due to the process exiting, we never
428		 * linger..
429		 */
430		timeout = 0;
431		if (sock_flag(sk, SOCK_LINGER) &&
432		    !(current->flags & PF_EXITING))
433			timeout = sk->sk_lingertime;
434		sock->sk = NULL;
435		sk->sk_prot->close(sk, timeout);
436	}
437	return 0;
438}
439
440/* It is off by default, see below. */
441int sysctl_ip_nonlocal_bind __read_mostly;
442
443int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
444{
445	struct sockaddr_in *addr = (struct sockaddr_in *)uaddr;
446	struct sock *sk = sock->sk;
447	struct inet_sock *inet = inet_sk(sk);
448	unsigned short snum;
449	int chk_addr_ret;
450	int err;
451
452	/* If the socket has its own bind function then use it. (RAW) */
453	if (sk->sk_prot->bind) {
454		err = sk->sk_prot->bind(sk, uaddr, addr_len);
455		goto out;
456	}
457	err = -EINVAL;
458	if (addr_len < sizeof(struct sockaddr_in))
459		goto out;
460
461	chk_addr_ret = inet_addr_type(sock_net(sk), addr->sin_addr.s_addr);
462
463	/* Not specified by any standard per-se, however it breaks too
464	 * many applications when removed.  It is unfortunate since
465	 * allowing applications to make a non-local bind solves
466	 * several problems with systems using dynamic addressing.
467	 * (ie. your servers still start up even if your ISDN link
468	 *  is temporarily down)
469	 */
470	err = -EADDRNOTAVAIL;
471	if (!sysctl_ip_nonlocal_bind &&
472	    !(inet->freebind || inet->transparent) &&
473	    addr->sin_addr.s_addr != htonl(INADDR_ANY) &&
474	    chk_addr_ret != RTN_LOCAL &&
475	    chk_addr_ret != RTN_MULTICAST &&
476	    chk_addr_ret != RTN_BROADCAST)
477		goto out;
478
479	snum = ntohs(addr->sin_port);
480	err = -EACCES;
481	if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
482		goto out;
483
484	/*      We keep a pair of addresses. rcv_saddr is the one
485	 *      used by hash lookups, and saddr is used for transmit.
486	 *
487	 *      In the BSD API these are the same except where it
488	 *      would be illegal to use them (multicast/broadcast) in
489	 *      which case the sending device address is used.
490	 */
491	lock_sock(sk);
492
493	/* Check these errors (active socket, double bind). */
494	err = -EINVAL;
495	if (sk->sk_state != TCP_CLOSE || inet->num)
496		goto out_release_sock;
497
498	inet->rcv_saddr = inet->saddr = addr->sin_addr.s_addr;
499	if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST)
500		inet->saddr = 0;  /* Use device */
501
502	/* Make sure we are allowed to bind here. */
503	if (sk->sk_prot->get_port(sk, snum)) {
504		inet->saddr = inet->rcv_saddr = 0;
505		err = -EADDRINUSE;
506		goto out_release_sock;
507	}
508
509	if (inet->rcv_saddr)
510		sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
511	if (snum)
512		sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
513	inet->sport = htons(inet->num);
514	inet->daddr = 0;
515	inet->dport = 0;
516	sk_dst_reset(sk);
517	err = 0;
518out_release_sock:
519	release_sock(sk);
520out:
521	return err;
522}
523
524int inet_dgram_connect(struct socket *sock, struct sockaddr * uaddr,
525		       int addr_len, int flags)
526{
527	struct sock *sk = sock->sk;
528
529	if (uaddr->sa_family == AF_UNSPEC)
530		return sk->sk_prot->disconnect(sk, flags);
531
532	if (!inet_sk(sk)->num && inet_autobind(sk))
533		return -EAGAIN;
534	return sk->sk_prot->connect(sk, (struct sockaddr *)uaddr, addr_len);
535}
536
537static long inet_wait_for_connect(struct sock *sk, long timeo)
538{
539	DEFINE_WAIT(wait);
540
541	prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
542
543	/* Basic assumption: if someone sets sk->sk_err, he _must_
544	 * change state of the socket from TCP_SYN_*.
545	 * Connect() does not allow to get error notifications
546	 * without closing the socket.
547	 */
548	while ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
549		release_sock(sk);
550		timeo = schedule_timeout(timeo);
551		lock_sock(sk);
552		if (signal_pending(current) || !timeo)
553			break;
554		prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
555	}
556	finish_wait(sk->sk_sleep, &wait);
557	return timeo;
558}
559
560/*
561 *	Connect to a remote host. There is regrettably still a little
562 *	TCP 'magic' in here.
563 */
564int inet_stream_connect(struct socket *sock, struct sockaddr *uaddr,
565			int addr_len, int flags)
566{
567	struct sock *sk = sock->sk;
568	int err;
569	long timeo;
570
571	lock_sock(sk);
572
573	if (uaddr->sa_family == AF_UNSPEC) {
574		err = sk->sk_prot->disconnect(sk, flags);
575		sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED;
576		goto out;
577	}
578
579	switch (sock->state) {
580	default:
581		err = -EINVAL;
582		goto out;
583	case SS_CONNECTED:
584		err = -EISCONN;
585		goto out;
586	case SS_CONNECTING:
587		err = -EALREADY;
588		/* Fall out of switch with err, set for this state */
589		break;
590	case SS_UNCONNECTED:
591		err = -EISCONN;
592		if (sk->sk_state != TCP_CLOSE)
593			goto out;
594
595		err = sk->sk_prot->connect(sk, uaddr, addr_len);
596		if (err < 0)
597			goto out;
598
599		sock->state = SS_CONNECTING;
600
601		/* Just entered SS_CONNECTING state; the only
602		 * difference is that return value in non-blocking
603		 * case is EINPROGRESS, rather than EALREADY.
604		 */
605		err = -EINPROGRESS;
606		break;
607	}
608
609	timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
610
611	if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
612		/* Error code is set above */
613		if (!timeo || !inet_wait_for_connect(sk, timeo))
614			goto out;
615
616		err = sock_intr_errno(timeo);
617		if (signal_pending(current))
618			goto out;
619	}
620
621	/* Connection was closed by RST, timeout, ICMP error
622	 * or another process disconnected us.
623	 */
624	if (sk->sk_state == TCP_CLOSE)
625		goto sock_error;
626
627	/* sk->sk_err may be not zero now, if RECVERR was ordered by user
628	 * and error was received after socket entered established state.
629	 * Hence, it is handled normally after connect() return successfully.
630	 */
631
632	sock->state = SS_CONNECTED;
633	err = 0;
634out:
635	release_sock(sk);
636	return err;
637
638sock_error:
639	err = sock_error(sk) ? : -ECONNABORTED;
640	sock->state = SS_UNCONNECTED;
641	if (sk->sk_prot->disconnect(sk, flags))
642		sock->state = SS_DISCONNECTING;
643	goto out;
644}
645
646/*
647 *	Accept a pending connection. The TCP layer now gives BSD semantics.
648 */
649
650int inet_accept(struct socket *sock, struct socket *newsock, int flags)
651{
652	struct sock *sk1 = sock->sk;
653	int err = -EINVAL;
654	struct sock *sk2 = sk1->sk_prot->accept(sk1, flags, &err);
655
656	if (!sk2)
657		goto do_err;
658
659	lock_sock(sk2);
660
661	WARN_ON(!((1 << sk2->sk_state) &
662		  (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT | TCPF_CLOSE)));
663
664	sock_graft(sk2, newsock);
665
666	newsock->state = SS_CONNECTED;
667	err = 0;
668	release_sock(sk2);
669do_err:
670	return err;
671}
672
673
674/*
675 *	This does both peername and sockname.
676 */
677int inet_getname(struct socket *sock, struct sockaddr *uaddr,
678			int *uaddr_len, int peer)
679{
680	struct sock *sk		= sock->sk;
681	struct inet_sock *inet	= inet_sk(sk);
682	struct sockaddr_in *sin	= (struct sockaddr_in *)uaddr;
683
684	sin->sin_family = AF_INET;
685	if (peer) {
686		if (!inet->dport ||
687		    (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
688		     peer == 1))
689			return -ENOTCONN;
690		sin->sin_port = inet->dport;
691		sin->sin_addr.s_addr = inet->daddr;
692	} else {
693		__be32 addr = inet->rcv_saddr;
694		if (!addr)
695			addr = inet->saddr;
696		sin->sin_port = inet->sport;
697		sin->sin_addr.s_addr = addr;
698	}
699	memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
700	*uaddr_len = sizeof(*sin);
701	return 0;
702}
703
704int inet_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg,
705		 size_t size)
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	return sk->sk_prot->sendmsg(iocb, sk, msg, size);
714}
715
716
717static ssize_t inet_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
718{
719	struct sock *sk = sock->sk;
720
721	/* We may need to bind the socket. */
722	if (!inet_sk(sk)->num && inet_autobind(sk))
723		return -EAGAIN;
724
725	if (sk->sk_prot->sendpage)
726		return sk->sk_prot->sendpage(sk, page, offset, size, flags);
727	return sock_no_sendpage(sock, page, offset, size, flags);
728}
729
730
731int inet_shutdown(struct socket *sock, int how)
732{
733	struct sock *sk = sock->sk;
734	int err = 0;
735
736	/* This should really check to make sure
737	 * the socket is a TCP socket. (WHY AC...)
738	 */
739	how++; /* maps 0->1 has the advantage of making bit 1 rcvs and
740		       1->2 bit 2 snds.
741		       2->3 */
742	if ((how & ~SHUTDOWN_MASK) || !how)	/* MAXINT->0 */
743		return -EINVAL;
744
745	lock_sock(sk);
746	if (sock->state == SS_CONNECTING) {
747		if ((1 << sk->sk_state) &
748		    (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE))
749			sock->state = SS_DISCONNECTING;
750		else
751			sock->state = SS_CONNECTED;
752	}
753
754	switch (sk->sk_state) {
755	case TCP_CLOSE:
756		err = -ENOTCONN;
757		/* Hack to wake up other listeners, who can poll for
758		   POLLHUP, even on eg. unconnected UDP sockets -- RR */
759	default:
760		sk->sk_shutdown |= how;
761		if (sk->sk_prot->shutdown)
762			sk->sk_prot->shutdown(sk, how);
763		break;
764
765	/* Remaining two branches are temporary solution for missing
766	 * close() in multithreaded environment. It is _not_ a good idea,
767	 * but we have no choice until close() is repaired at VFS level.
768	 */
769	case TCP_LISTEN:
770		if (!(how & RCV_SHUTDOWN))
771			break;
772		/* Fall through */
773	case TCP_SYN_SENT:
774		err = sk->sk_prot->disconnect(sk, O_NONBLOCK);
775		sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED;
776		break;
777	}
778
779	/* Wake up anyone sleeping in poll. */
780	sk->sk_state_change(sk);
781	release_sock(sk);
782	return err;
783}
784
785/*
786 *	ioctl() calls you can issue on an INET socket. Most of these are
787 *	device configuration and stuff and very rarely used. Some ioctls
788 *	pass on to the socket itself.
789 *
790 *	NOTE: I like the idea of a module for the config stuff. ie ifconfig
791 *	loads the devconfigure module does its configuring and unloads it.
792 *	There's a good 20K of config code hanging around the kernel.
793 */
794
795int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
796{
797	struct sock *sk = sock->sk;
798	int err = 0;
799	struct net *net = sock_net(sk);
800
801	switch (cmd) {
802		case SIOCGSTAMP:
803			err = sock_get_timestamp(sk, (struct timeval __user *)arg);
804			break;
805		case SIOCGSTAMPNS:
806			err = sock_get_timestampns(sk, (struct timespec __user *)arg);
807			break;
808		case SIOCADDRT:
809		case SIOCDELRT:
810		case SIOCRTMSG:
811			err = ip_rt_ioctl(net, cmd, (void __user *)arg);
812			break;
813		case SIOCDARP:
814		case SIOCGARP:
815		case SIOCSARP:
816			err = arp_ioctl(net, cmd, (void __user *)arg);
817			break;
818		case SIOCGIFADDR:
819		case SIOCSIFADDR:
820		case SIOCGIFBRDADDR:
821		case SIOCSIFBRDADDR:
822		case SIOCGIFNETMASK:
823		case SIOCSIFNETMASK:
824		case SIOCGIFDSTADDR:
825		case SIOCSIFDSTADDR:
826		case SIOCSIFPFLAGS:
827		case SIOCGIFPFLAGS:
828		case SIOCSIFFLAGS:
829			err = devinet_ioctl(net, cmd, (void __user *)arg);
830			break;
831		default:
832			if (sk->sk_prot->ioctl)
833				err = sk->sk_prot->ioctl(sk, cmd, arg);
834			else
835				err = -ENOIOCTLCMD;
836			break;
837	}
838	return err;
839}
840
841const struct proto_ops inet_stream_ops = {
842	.family		   = PF_INET,
843	.owner		   = THIS_MODULE,
844	.release	   = inet_release,
845	.bind		   = inet_bind,
846	.connect	   = inet_stream_connect,
847	.socketpair	   = sock_no_socketpair,
848	.accept		   = inet_accept,
849	.getname	   = inet_getname,
850	.poll		   = tcp_poll,
851	.ioctl		   = inet_ioctl,
852	.listen		   = inet_listen,
853	.shutdown	   = inet_shutdown,
854	.setsockopt	   = sock_common_setsockopt,
855	.getsockopt	   = sock_common_getsockopt,
856	.sendmsg	   = tcp_sendmsg,
857	.recvmsg	   = sock_common_recvmsg,
858	.mmap		   = sock_no_mmap,
859	.sendpage	   = tcp_sendpage,
860	.splice_read	   = tcp_splice_read,
861#ifdef CONFIG_COMPAT
862	.compat_setsockopt = compat_sock_common_setsockopt,
863	.compat_getsockopt = compat_sock_common_getsockopt,
864#endif
865};
866
867const struct proto_ops inet_dgram_ops = {
868	.family		   = PF_INET,
869	.owner		   = THIS_MODULE,
870	.release	   = inet_release,
871	.bind		   = inet_bind,
872	.connect	   = inet_dgram_connect,
873	.socketpair	   = sock_no_socketpair,
874	.accept		   = sock_no_accept,
875	.getname	   = inet_getname,
876	.poll		   = udp_poll,
877	.ioctl		   = inet_ioctl,
878	.listen		   = sock_no_listen,
879	.shutdown	   = inet_shutdown,
880	.setsockopt	   = sock_common_setsockopt,
881	.getsockopt	   = sock_common_getsockopt,
882	.sendmsg	   = inet_sendmsg,
883	.recvmsg	   = sock_common_recvmsg,
884	.mmap		   = sock_no_mmap,
885	.sendpage	   = inet_sendpage,
886#ifdef CONFIG_COMPAT
887	.compat_setsockopt = compat_sock_common_setsockopt,
888	.compat_getsockopt = compat_sock_common_getsockopt,
889#endif
890};
891
892/*
893 * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without
894 * udp_poll
895 */
896static const struct proto_ops inet_sockraw_ops = {
897	.family		   = PF_INET,
898	.owner		   = THIS_MODULE,
899	.release	   = inet_release,
900	.bind		   = inet_bind,
901	.connect	   = inet_dgram_connect,
902	.socketpair	   = sock_no_socketpair,
903	.accept		   = sock_no_accept,
904	.getname	   = inet_getname,
905	.poll		   = datagram_poll,
906	.ioctl		   = inet_ioctl,
907	.listen		   = sock_no_listen,
908	.shutdown	   = inet_shutdown,
909	.setsockopt	   = sock_common_setsockopt,
910	.getsockopt	   = sock_common_getsockopt,
911	.sendmsg	   = inet_sendmsg,
912	.recvmsg	   = sock_common_recvmsg,
913	.mmap		   = sock_no_mmap,
914	.sendpage	   = inet_sendpage,
915#ifdef CONFIG_COMPAT
916	.compat_setsockopt = compat_sock_common_setsockopt,
917	.compat_getsockopt = compat_sock_common_getsockopt,
918#endif
919};
920
921static struct net_proto_family inet_family_ops = {
922	.family = PF_INET,
923	.create = inet_create,
924	.owner	= THIS_MODULE,
925};
926
927/* Upon startup we insert all the elements in inetsw_array[] into
928 * the linked list inetsw.
929 */
930static struct inet_protosw inetsw_array[] =
931{
932	{
933		.type =       SOCK_STREAM,
934		.protocol =   IPPROTO_TCP,
935		.prot =       &tcp_prot,
936		.ops =        &inet_stream_ops,
937		.capability = -1,
938		.no_check =   0,
939		.flags =      INET_PROTOSW_PERMANENT |
940			      INET_PROTOSW_ICSK,
941	},
942
943	{
944		.type =       SOCK_DGRAM,
945		.protocol =   IPPROTO_UDP,
946		.prot =       &udp_prot,
947		.ops =        &inet_dgram_ops,
948		.capability = -1,
949		.no_check =   UDP_CSUM_DEFAULT,
950		.flags =      INET_PROTOSW_PERMANENT,
951       },
952
953
954       {
955	       .type =       SOCK_RAW,
956	       .protocol =   IPPROTO_IP,	/* wild card */
957	       .prot =       &raw_prot,
958	       .ops =        &inet_sockraw_ops,
959	       .capability = CAP_NET_RAW,
960	       .no_check =   UDP_CSUM_DEFAULT,
961	       .flags =      INET_PROTOSW_REUSE,
962       }
963};
964
965#define INETSW_ARRAY_LEN ARRAY_SIZE(inetsw_array)
966
967void inet_register_protosw(struct inet_protosw *p)
968{
969	struct list_head *lh;
970	struct inet_protosw *answer;
971	int protocol = p->protocol;
972	struct list_head *last_perm;
973
974	spin_lock_bh(&inetsw_lock);
975
976	if (p->type >= SOCK_MAX)
977		goto out_illegal;
978
979	/* If we are trying to override a permanent protocol, bail. */
980	answer = NULL;
981	last_perm = &inetsw[p->type];
982	list_for_each(lh, &inetsw[p->type]) {
983		answer = list_entry(lh, struct inet_protosw, list);
984
985		/* Check only the non-wild match. */
986		if (INET_PROTOSW_PERMANENT & answer->flags) {
987			if (protocol == answer->protocol)
988				break;
989			last_perm = lh;
990		}
991
992		answer = NULL;
993	}
994	if (answer)
995		goto out_permanent;
996
997	/* Add the new entry after the last permanent entry if any, so that
998	 * the new entry does not override a permanent entry when matched with
999	 * a wild-card protocol. But it is allowed to override any existing
1000	 * non-permanent entry.  This means that when we remove this entry, the
1001	 * system automatically returns to the old behavior.
1002	 */
1003	list_add_rcu(&p->list, last_perm);
1004out:
1005	spin_unlock_bh(&inetsw_lock);
1006
1007	synchronize_net();
1008
1009	return;
1010
1011out_permanent:
1012	printk(KERN_ERR "Attempt to override permanent protocol %d.\n",
1013	       protocol);
1014	goto out;
1015
1016out_illegal:
1017	printk(KERN_ERR
1018	       "Ignoring attempt to register invalid socket type %d.\n",
1019	       p->type);
1020	goto out;
1021}
1022
1023void inet_unregister_protosw(struct inet_protosw *p)
1024{
1025	if (INET_PROTOSW_PERMANENT & p->flags) {
1026		printk(KERN_ERR
1027		       "Attempt to unregister permanent protocol %d.\n",
1028		       p->protocol);
1029	} else {
1030		spin_lock_bh(&inetsw_lock);
1031		list_del_rcu(&p->list);
1032		spin_unlock_bh(&inetsw_lock);
1033
1034		synchronize_net();
1035	}
1036}
1037
1038/*
1039 *      Shall we try to damage output packets if routing dev changes?
1040 */
1041
1042int sysctl_ip_dynaddr __read_mostly;
1043
1044static int inet_sk_reselect_saddr(struct sock *sk)
1045{
1046	struct inet_sock *inet = inet_sk(sk);
1047	int err;
1048	struct rtable *rt;
1049	__be32 old_saddr = inet->saddr;
1050	__be32 new_saddr;
1051	__be32 daddr = inet->daddr;
1052
1053	if (inet->opt && inet->opt->srr)
1054		daddr = inet->opt->faddr;
1055
1056	/* Query new route. */
1057	err = ip_route_connect(&rt, daddr, 0,
1058			       RT_CONN_FLAGS(sk),
1059			       sk->sk_bound_dev_if,
1060			       sk->sk_protocol,
1061			       inet->sport, inet->dport, sk, 0);
1062	if (err)
1063		return err;
1064
1065	sk_setup_caps(sk, &rt->u.dst);
1066
1067	new_saddr = rt->rt_src;
1068
1069	if (new_saddr == old_saddr)
1070		return 0;
1071
1072	if (sysctl_ip_dynaddr > 1) {
1073		printk(KERN_INFO "%s(): shifting inet->"
1074				 "saddr from " NIPQUAD_FMT " to " NIPQUAD_FMT "\n",
1075		       __func__,
1076		       NIPQUAD(old_saddr),
1077		       NIPQUAD(new_saddr));
1078	}
1079
1080	inet->saddr = inet->rcv_saddr = new_saddr;
1081
1082	/*
1083	 * XXX The only one ugly spot where we need to
1084	 * XXX really change the sockets identity after
1085	 * XXX it has entered the hashes. -DaveM
1086	 *
1087	 * Besides that, it does not check for connection
1088	 * uniqueness. Wait for troubles.
1089	 */
1090	__sk_prot_rehash(sk);
1091	return 0;
1092}
1093
1094int inet_sk_rebuild_header(struct sock *sk)
1095{
1096	struct inet_sock *inet = inet_sk(sk);
1097	struct rtable *rt = (struct rtable *)__sk_dst_check(sk, 0);
1098	__be32 daddr;
1099	int err;
1100
1101	/* Route is OK, nothing to do. */
1102	if (rt)
1103		return 0;
1104
1105	/* Reroute. */
1106	daddr = inet->daddr;
1107	if (inet->opt && inet->opt->srr)
1108		daddr = inet->opt->faddr;
1109{
1110	struct flowi fl = {
1111		.oif = sk->sk_bound_dev_if,
1112		.nl_u = {
1113			.ip4_u = {
1114				.daddr	= daddr,
1115				.saddr	= inet->saddr,
1116				.tos	= RT_CONN_FLAGS(sk),
1117			},
1118		},
1119		.proto = sk->sk_protocol,
1120		.flags = inet_sk_flowi_flags(sk),
1121		.uli_u = {
1122			.ports = {
1123				.sport = inet->sport,
1124				.dport = inet->dport,
1125			},
1126		},
1127	};
1128
1129	security_sk_classify_flow(sk, &fl);
1130	err = ip_route_output_flow(sock_net(sk), &rt, &fl, sk, 0);
1131}
1132	if (!err)
1133		sk_setup_caps(sk, &rt->u.dst);
1134	else {
1135		/* Routing failed... */
1136		sk->sk_route_caps = 0;
1137		/*
1138		 * Other protocols have to map its equivalent state to TCP_SYN_SENT.
1139		 * DCCP maps its DCCP_REQUESTING state to TCP_SYN_SENT. -acme
1140		 */
1141		if (!sysctl_ip_dynaddr ||
1142		    sk->sk_state != TCP_SYN_SENT ||
1143		    (sk->sk_userlocks & SOCK_BINDADDR_LOCK) ||
1144		    (err = inet_sk_reselect_saddr(sk)) != 0)
1145			sk->sk_err_soft = -err;
1146	}
1147
1148	return err;
1149}
1150
1151EXPORT_SYMBOL(inet_sk_rebuild_header);
1152
1153static int inet_gso_send_check(struct sk_buff *skb)
1154{
1155	struct iphdr *iph;
1156	struct net_protocol *ops;
1157	int proto;
1158	int ihl;
1159	int err = -EINVAL;
1160
1161	if (unlikely(!pskb_may_pull(skb, sizeof(*iph))))
1162		goto out;
1163
1164	iph = ip_hdr(skb);
1165	ihl = iph->ihl * 4;
1166	if (ihl < sizeof(*iph))
1167		goto out;
1168
1169	if (unlikely(!pskb_may_pull(skb, ihl)))
1170		goto out;
1171
1172	__skb_pull(skb, ihl);
1173	skb_reset_transport_header(skb);
1174	iph = ip_hdr(skb);
1175	proto = iph->protocol & (MAX_INET_PROTOS - 1);
1176	err = -EPROTONOSUPPORT;
1177
1178	rcu_read_lock();
1179	ops = rcu_dereference(inet_protos[proto]);
1180	if (likely(ops && ops->gso_send_check))
1181		err = ops->gso_send_check(skb);
1182	rcu_read_unlock();
1183
1184out:
1185	return err;
1186}
1187
1188static struct sk_buff *inet_gso_segment(struct sk_buff *skb, int features)
1189{
1190	struct sk_buff *segs = ERR_PTR(-EINVAL);
1191	struct iphdr *iph;
1192	struct net_protocol *ops;
1193	int proto;
1194	int ihl;
1195	int id;
1196
1197	if (!(features & NETIF_F_V4_CSUM))
1198		features &= ~NETIF_F_SG;
1199
1200	if (unlikely(skb_shinfo(skb)->gso_type &
1201		     ~(SKB_GSO_TCPV4 |
1202		       SKB_GSO_UDP |
1203		       SKB_GSO_DODGY |
1204		       SKB_GSO_TCP_ECN |
1205		       0)))
1206		goto out;
1207
1208	if (unlikely(!pskb_may_pull(skb, sizeof(*iph))))
1209		goto out;
1210
1211	iph = ip_hdr(skb);
1212	ihl = iph->ihl * 4;
1213	if (ihl < sizeof(*iph))
1214		goto out;
1215
1216	if (unlikely(!pskb_may_pull(skb, ihl)))
1217		goto out;
1218
1219	__skb_pull(skb, ihl);
1220	skb_reset_transport_header(skb);
1221	iph = ip_hdr(skb);
1222	id = ntohs(iph->id);
1223	proto = iph->protocol & (MAX_INET_PROTOS - 1);
1224	segs = ERR_PTR(-EPROTONOSUPPORT);
1225
1226	rcu_read_lock();
1227	ops = rcu_dereference(inet_protos[proto]);
1228	if (likely(ops && ops->gso_segment))
1229		segs = ops->gso_segment(skb, features);
1230	rcu_read_unlock();
1231
1232	if (!segs || IS_ERR(segs))
1233		goto out;
1234
1235	skb = segs;
1236	do {
1237		iph = ip_hdr(skb);
1238		iph->id = htons(id++);
1239		iph->tot_len = htons(skb->len - skb->mac_len);
1240		iph->check = 0;
1241		iph->check = ip_fast_csum(skb_network_header(skb), iph->ihl);
1242	} while ((skb = skb->next));
1243
1244out:
1245	return segs;
1246}
1247
1248int inet_ctl_sock_create(struct sock **sk, unsigned short family,
1249			 unsigned short type, unsigned char protocol,
1250			 struct net *net)
1251{
1252	struct socket *sock;
1253	int rc = sock_create_kern(family, type, protocol, &sock);
1254
1255	if (rc == 0) {
1256		*sk = sock->sk;
1257		(*sk)->sk_allocation = GFP_ATOMIC;
1258		/*
1259		 * Unhash it so that IP input processing does not even see it,
1260		 * we do not wish this socket to see incoming packets.
1261		 */
1262		(*sk)->sk_prot->unhash(*sk);
1263
1264		sk_change_net(*sk, net);
1265	}
1266	return rc;
1267}
1268
1269EXPORT_SYMBOL_GPL(inet_ctl_sock_create);
1270
1271unsigned long snmp_fold_field(void *mib[], int offt)
1272{
1273	unsigned long res = 0;
1274	int i;
1275
1276	for_each_possible_cpu(i) {
1277		res += *(((unsigned long *) per_cpu_ptr(mib[0], i)) + offt);
1278		res += *(((unsigned long *) per_cpu_ptr(mib[1], i)) + offt);
1279	}
1280	return res;
1281}
1282EXPORT_SYMBOL_GPL(snmp_fold_field);
1283
1284int snmp_mib_init(void *ptr[2], size_t mibsize)
1285{
1286	BUG_ON(ptr == NULL);
1287	ptr[0] = __alloc_percpu(mibsize);
1288	if (!ptr[0])
1289		goto err0;
1290	ptr[1] = __alloc_percpu(mibsize);
1291	if (!ptr[1])
1292		goto err1;
1293	return 0;
1294err1:
1295	free_percpu(ptr[0]);
1296	ptr[0] = NULL;
1297err0:
1298	return -ENOMEM;
1299}
1300EXPORT_SYMBOL_GPL(snmp_mib_init);
1301
1302void snmp_mib_free(void *ptr[2])
1303{
1304	BUG_ON(ptr == NULL);
1305	free_percpu(ptr[0]);
1306	free_percpu(ptr[1]);
1307	ptr[0] = ptr[1] = NULL;
1308}
1309EXPORT_SYMBOL_GPL(snmp_mib_free);
1310
1311#ifdef CONFIG_IP_MULTICAST
1312static struct net_protocol igmp_protocol = {
1313	.handler =	igmp_rcv,
1314};
1315#endif
1316
1317static struct net_protocol tcp_protocol = {
1318	.handler =	tcp_v4_rcv,
1319	.err_handler =	tcp_v4_err,
1320	.gso_send_check = tcp_v4_gso_send_check,
1321	.gso_segment =	tcp_tso_segment,
1322	.no_policy =	1,
1323	.netns_ok =	1,
1324};
1325
1326static struct net_protocol udp_protocol = {
1327	.handler =	udp_rcv,
1328	.err_handler =	udp_err,
1329	.no_policy =	1,
1330	.netns_ok =	1,
1331};
1332
1333static struct net_protocol icmp_protocol = {
1334	.handler =	icmp_rcv,
1335	.no_policy =	1,
1336	.netns_ok =	1,
1337};
1338
1339static __net_init int ipv4_mib_init_net(struct net *net)
1340{
1341	if (snmp_mib_init((void **)net->mib.tcp_statistics,
1342			  sizeof(struct tcp_mib)) < 0)
1343		goto err_tcp_mib;
1344	if (snmp_mib_init((void **)net->mib.ip_statistics,
1345			  sizeof(struct ipstats_mib)) < 0)
1346		goto err_ip_mib;
1347	if (snmp_mib_init((void **)net->mib.net_statistics,
1348			  sizeof(struct linux_mib)) < 0)
1349		goto err_net_mib;
1350	if (snmp_mib_init((void **)net->mib.udp_statistics,
1351			  sizeof(struct udp_mib)) < 0)
1352		goto err_udp_mib;
1353	if (snmp_mib_init((void **)net->mib.udplite_statistics,
1354			  sizeof(struct udp_mib)) < 0)
1355		goto err_udplite_mib;
1356	if (snmp_mib_init((void **)net->mib.icmp_statistics,
1357			  sizeof(struct icmp_mib)) < 0)
1358		goto err_icmp_mib;
1359	if (snmp_mib_init((void **)net->mib.icmpmsg_statistics,
1360			  sizeof(struct icmpmsg_mib)) < 0)
1361		goto err_icmpmsg_mib;
1362
1363	tcp_mib_init(net);
1364	return 0;
1365
1366err_icmpmsg_mib:
1367	snmp_mib_free((void **)net->mib.icmp_statistics);
1368err_icmp_mib:
1369	snmp_mib_free((void **)net->mib.udplite_statistics);
1370err_udplite_mib:
1371	snmp_mib_free((void **)net->mib.udp_statistics);
1372err_udp_mib:
1373	snmp_mib_free((void **)net->mib.net_statistics);
1374err_net_mib:
1375	snmp_mib_free((void **)net->mib.ip_statistics);
1376err_ip_mib:
1377	snmp_mib_free((void **)net->mib.tcp_statistics);
1378err_tcp_mib:
1379	return -ENOMEM;
1380}
1381
1382static __net_exit void ipv4_mib_exit_net(struct net *net)
1383{
1384	snmp_mib_free((void **)net->mib.icmpmsg_statistics);
1385	snmp_mib_free((void **)net->mib.icmp_statistics);
1386	snmp_mib_free((void **)net->mib.udplite_statistics);
1387	snmp_mib_free((void **)net->mib.udp_statistics);
1388	snmp_mib_free((void **)net->mib.net_statistics);
1389	snmp_mib_free((void **)net->mib.ip_statistics);
1390	snmp_mib_free((void **)net->mib.tcp_statistics);
1391}
1392
1393static __net_initdata struct pernet_operations ipv4_mib_ops = {
1394	.init = ipv4_mib_init_net,
1395	.exit = ipv4_mib_exit_net,
1396};
1397
1398static int __init init_ipv4_mibs(void)
1399{
1400	return register_pernet_subsys(&ipv4_mib_ops);
1401}
1402
1403static int ipv4_proc_init(void);
1404
1405/*
1406 *	IP protocol layer initialiser
1407 */
1408
1409static struct packet_type ip_packet_type = {
1410	.type = __constant_htons(ETH_P_IP),
1411	.func = ip_rcv,
1412	.gso_send_check = inet_gso_send_check,
1413	.gso_segment = inet_gso_segment,
1414};
1415
1416static int __init inet_init(void)
1417{
1418	struct sk_buff *dummy_skb;
1419	struct inet_protosw *q;
1420	struct list_head *r;
1421	int rc = -EINVAL;
1422
1423	BUILD_BUG_ON(sizeof(struct inet_skb_parm) > sizeof(dummy_skb->cb));
1424
1425	rc = proto_register(&tcp_prot, 1);
1426	if (rc)
1427		goto out;
1428
1429	rc = proto_register(&udp_prot, 1);
1430	if (rc)
1431		goto out_unregister_tcp_proto;
1432
1433	rc = proto_register(&raw_prot, 1);
1434	if (rc)
1435		goto out_unregister_udp_proto;
1436
1437	/*
1438	 *	Tell SOCKET that we are alive...
1439	 */
1440
1441	(void)sock_register(&inet_family_ops);
1442
1443#ifdef CONFIG_SYSCTL
1444	ip_static_sysctl_init();
1445#endif
1446
1447	/*
1448	 *	Add all the base protocols.
1449	 */
1450
1451	if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0)
1452		printk(KERN_CRIT "inet_init: Cannot add ICMP protocol\n");
1453	if (inet_add_protocol(&udp_protocol, IPPROTO_UDP) < 0)
1454		printk(KERN_CRIT "inet_init: Cannot add UDP protocol\n");
1455	if (inet_add_protocol(&tcp_protocol, IPPROTO_TCP) < 0)
1456		printk(KERN_CRIT "inet_init: Cannot add TCP protocol\n");
1457#ifdef CONFIG_IP_MULTICAST
1458	if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0)
1459		printk(KERN_CRIT "inet_init: Cannot add IGMP protocol\n");
1460#endif
1461
1462	/* Register the socket-side information for inet_create. */
1463	for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r)
1464		INIT_LIST_HEAD(r);
1465
1466	for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q)
1467		inet_register_protosw(q);
1468
1469	/*
1470	 *	Set the ARP module up
1471	 */
1472
1473	arp_init();
1474
1475	/*
1476	 *	Set the IP module up
1477	 */
1478
1479	ip_init();
1480
1481	tcp_v4_init();
1482
1483	/* Setup TCP slab cache for open requests. */
1484	tcp_init();
1485
1486	/* Setup UDP memory threshold */
1487	udp_init();
1488
1489	/* Add UDP-Lite (RFC 3828) */
1490	udplite4_register();
1491
1492	/*
1493	 *	Set the ICMP layer up
1494	 */
1495
1496	if (icmp_init() < 0)
1497		panic("Failed to create the ICMP control socket.\n");
1498
1499	/*
1500	 *	Initialise the multicast router
1501	 */
1502#if defined(CONFIG_IP_MROUTE)
1503	if (ip_mr_init())
1504		printk(KERN_CRIT "inet_init: Cannot init ipv4 mroute\n");
1505#endif
1506	/*
1507	 *	Initialise per-cpu ipv4 mibs
1508	 */
1509
1510	if (init_ipv4_mibs())
1511		printk(KERN_CRIT "inet_init: Cannot init ipv4 mibs\n");
1512
1513	ipv4_proc_init();
1514
1515	ipfrag_init();
1516
1517	dev_add_pack(&ip_packet_type);
1518
1519	rc = 0;
1520out:
1521	return rc;
1522out_unregister_udp_proto:
1523	proto_unregister(&udp_prot);
1524out_unregister_tcp_proto:
1525	proto_unregister(&tcp_prot);
1526	goto out;
1527}
1528
1529fs_initcall(inet_init);
1530
1531/* ------------------------------------------------------------------------ */
1532
1533#ifdef CONFIG_PROC_FS
1534static int __init ipv4_proc_init(void)
1535{
1536	int rc = 0;
1537
1538	if (raw_proc_init())
1539		goto out_raw;
1540	if (tcp4_proc_init())
1541		goto out_tcp;
1542	if (udp4_proc_init())
1543		goto out_udp;
1544	if (ip_misc_proc_init())
1545		goto out_misc;
1546out:
1547	return rc;
1548out_misc:
1549	udp4_proc_exit();
1550out_udp:
1551	tcp4_proc_exit();
1552out_tcp:
1553	raw_proc_exit();
1554out_raw:
1555	rc = -ENOMEM;
1556	goto out;
1557}
1558
1559#else /* CONFIG_PROC_FS */
1560static int __init ipv4_proc_init(void)
1561{
1562	return 0;
1563}
1564#endif /* CONFIG_PROC_FS */
1565
1566MODULE_ALIAS_NETPROTO(PF_INET);
1567
1568EXPORT_SYMBOL(inet_accept);
1569EXPORT_SYMBOL(inet_bind);
1570EXPORT_SYMBOL(inet_dgram_connect);
1571EXPORT_SYMBOL(inet_dgram_ops);
1572EXPORT_SYMBOL(inet_getname);
1573EXPORT_SYMBOL(inet_ioctl);
1574EXPORT_SYMBOL(inet_listen);
1575EXPORT_SYMBOL(inet_register_protosw);
1576EXPORT_SYMBOL(inet_release);
1577EXPORT_SYMBOL(inet_sendmsg);
1578EXPORT_SYMBOL(inet_shutdown);
1579EXPORT_SYMBOL(inet_sock_destruct);
1580EXPORT_SYMBOL(inet_stream_connect);
1581EXPORT_SYMBOL(inet_stream_ops);
1582EXPORT_SYMBOL(inet_unregister_protosw);
1583EXPORT_SYMBOL(sysctl_ip_nonlocal_bind);
1584