Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 1188 insertions, 0 deletions

diff --git a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c
new file mode 100644
index 000000000000..c34dab67e461
--- /dev/null
+++ b/net/ipv4/af_inet.c
@@ -0,0 +1,1188 @@
+/*
+ * INET		An implementation of the TCP/IP protocol suite for the LINUX
+ *		operating system.  INET is implemented using the  BSD Socket
+ *		interface as the means of communication with the user level.
+ *
+ *		PF_INET protocol family socket handler.
+ *
+ * Version:	$Id: af_inet.c,v 1.137 2002/02/01 22:01:03 davem Exp $
+ *
+ * Authors:	Ross Biro, <bir7@leland.Stanford.Edu>
+ *		Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
+ *		Florian La Roche, <flla@stud.uni-sb.de>
+ *		Alan Cox, <A.Cox@swansea.ac.uk>
+ *
+ * Changes (see also sock.c)
+ *
+ *		piggy,
+ *		Karl Knutson	:	Socket protocol table
+ *		A.N.Kuznetsov	:	Socket death error in accept().
+ *		John Richardson :	Fix non blocking error in connect()
+ *					so sockets that fail to connect
+ *					don't return -EINPROGRESS.
+ *		Alan Cox	:	Asynchronous I/O support
+ *		Alan Cox	:	Keep correct socket pointer on sock
+ *					structures
+ *					when accept() ed
+ *		Alan Cox	:	Semantics of SO_LINGER aren't state
+ *					moved to close when you look carefully.
+ *					With this fixed and the accept bug fixed
+ *					some RPC stuff seems happier.
+ *		Niibe Yutaka	:	4.4BSD style write async I/O
+ *		Alan Cox,
+ *		Tony Gale 	:	Fixed reuse semantics.
+ *		Alan Cox	:	bind() shouldn't abort existing but dead
+ *					sockets. Stops FTP netin:.. I hope.
+ *		Alan Cox	:	bind() works correctly for RAW sockets.
+ *					Note that FreeBSD at least was broken
+ *					in this respect so be careful with
+ *					compatibility tests...
+ *		Alan Cox	:	routing cache support
+ *		Alan Cox	:	memzero the socket structure for
+ *					compactness.
+ *		Matt Day	:	nonblock connect error handler
+ *		Alan Cox	:	Allow large numbers of pending sockets
+ *					(eg for big web sites), but only if
+ *					specifically application requested.
+ *		Alan Cox	:	New buffering throughout IP. Used
+ *					dumbly.
+ *		Alan Cox	:	New buffering now used smartly.
+ *		Alan Cox	:	BSD rather than common sense
+ *					interpretation of listen.
+ *		Germano Caronni	:	Assorted small races.
+ *		Alan Cox	:	sendmsg/recvmsg basic support.
+ *		Alan Cox	:	Only sendmsg/recvmsg now supported.
+ *		Alan Cox	:	Locked down bind (see security list).
+ *		Alan Cox	:	Loosened bind a little.
+ *		Mike McLagan	:	ADD/DEL DLCI Ioctls
+ *	Willy Konynenberg	:	Transparent proxying support.
+ *		David S. Miller	:	New socket lookup architecture.
+ *					Some other random speedups.
+ *		Cyrus Durgin	:	Cleaned up file for kmod hacks.
+ *		Andi Kleen	:	Fix inet_stream_connect TCP race.
+ *
+ *		This program is free software; you can redistribute it and/or
+ *		modify it under the terms of the GNU General Public License
+ *		as published by the Free Software Foundation; either version
+ *		2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/config.h>
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/socket.h>
+#include <linux/in.h>
+#include <linux/kernel.h>
+#include <linux/major.h>
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/timer.h>
+#include <linux/string.h>
+#include <linux/sockios.h>
+#include <linux/net.h>
+#include <linux/fcntl.h>
+#include <linux/mm.h>
+#include <linux/interrupt.h>
+#include <linux/stat.h>
+#include <linux/init.h>
+#include <linux/poll.h>
+#include <linux/netfilter_ipv4.h>
+
+#include <asm/uaccess.h>
+#include <asm/system.h>
+
+#include <linux/smp_lock.h>
+#include <linux/inet.h>
+#include <linux/igmp.h>
+#include <linux/netdevice.h>
+#include <net/ip.h>
+#include <net/protocol.h>
+#include <net/arp.h>
+#include <net/route.h>
+#include <net/ip_fib.h>
+#include <net/tcp.h>
+#include <net/udp.h>
+#include <linux/skbuff.h>
+#include <net/sock.h>
+#include <net/raw.h>
+#include <net/icmp.h>
+#include <net/ipip.h>
+#include <net/inet_common.h>
+#include <net/xfrm.h>
+#ifdef CONFIG_IP_MROUTE
+#include <linux/mroute.h>
+#endif
+
+DEFINE_SNMP_STAT(struct linux_mib, net_statistics);
+
+#ifdef INET_REFCNT_DEBUG
+atomic_t inet_sock_nr;
+#endif
+
+extern void ip_mc_drop_socket(struct sock *sk);
+
+/* The inetsw table contains everything that inet_create needs to
+ * build a new socket.
+ */
+static struct list_head inetsw[SOCK_MAX];
+static DEFINE_SPINLOCK(inetsw_lock);
+
+/* New destruction routine */
+
+void inet_sock_destruct(struct sock *sk)
+{
+	struct inet_sock *inet = inet_sk(sk);
+
+	__skb_queue_purge(&sk->sk_receive_queue);
+	__skb_queue_purge(&sk->sk_error_queue);
+
+	if (sk->sk_type == SOCK_STREAM && sk->sk_state != TCP_CLOSE) {
+		printk("Attempt to release TCP socket in state %d %p\n",
+		       sk->sk_state, sk);
+		return;
+	}
+	if (!sock_flag(sk, SOCK_DEAD)) {
+		printk("Attempt to release alive inet socket %p\n", sk);
+		return;
+	}
+
+	BUG_TRAP(!atomic_read(&sk->sk_rmem_alloc));
+	BUG_TRAP(!atomic_read(&sk->sk_wmem_alloc));
+	BUG_TRAP(!sk->sk_wmem_queued);
+	BUG_TRAP(!sk->sk_forward_alloc);
+
+	if (inet->opt)
+		kfree(inet->opt);
+	dst_release(sk->sk_dst_cache);
+#ifdef INET_REFCNT_DEBUG
+	atomic_dec(&inet_sock_nr);
+	printk(KERN_DEBUG "INET socket %p released, %d are still alive\n",
+	       sk, atomic_read(&inet_sock_nr));
+#endif
+}
+
+/*
+ *	The routines beyond this point handle the behaviour of an AF_INET
+ *	socket object. Mostly it punts to the subprotocols of IP to do
+ *	the work.
+ */
+
+/*
+ *	Automatically bind an unbound socket.
+ */
+
+static int inet_autobind(struct sock *sk)
+{
+	struct inet_sock *inet;
+	/* We may need to bind the socket. */
+	lock_sock(sk);
+	inet = inet_sk(sk);
+	if (!inet->num) {
+		if (sk->sk_prot->get_port(sk, 0)) {
+			release_sock(sk);
+			return -EAGAIN;
+		}
+		inet->sport = htons(inet->num);
+	}
+	release_sock(sk);
+	return 0;
+}
+
+/*
+ *	Move a socket into listening state.
+ */
+int inet_listen(struct socket *sock, int backlog)
+{
+	struct sock *sk = sock->sk;
+	unsigned char old_state;
+	int err;
+
+	lock_sock(sk);
+
+	err = -EINVAL;
+	if (sock->state != SS_UNCONNECTED || sock->type != SOCK_STREAM)
+		goto out;
+
+	old_state = sk->sk_state;
+	if (!((1 << old_state) & (TCPF_CLOSE | TCPF_LISTEN)))
+		goto out;
+
+	/* Really, if the socket is already in listen state
+	 * we can only allow the backlog to be adjusted.
+	 */
+	if (old_state != TCP_LISTEN) {
+		err = tcp_listen_start(sk);
+		if (err)
+			goto out;
+	}
+	sk->sk_max_ack_backlog = backlog;
+	err = 0;
+
+out:
+	release_sock(sk);
+	return err;
+}
+
+/*
+ *	Create an inet socket.
+ */
+
+static int inet_create(struct socket *sock, int protocol)
+{
+	struct sock *sk;
+	struct list_head *p;
+	struct inet_protosw *answer;
+	struct inet_sock *inet;
+	struct proto *answer_prot;
+	unsigned char answer_flags;
+	char answer_no_check;
+	int err;
+
+	sock->state = SS_UNCONNECTED;
+
+	/* Look for the requested type/protocol pair. */
+	answer = NULL;
+	rcu_read_lock();
+	list_for_each_rcu(p, &inetsw[sock->type]) {
+		answer = list_entry(p, struct inet_protosw, list);
+
+		/* Check the non-wild match. */
+		if (protocol == answer->protocol) {
+			if (protocol != IPPROTO_IP)
+				break;
+		} else {
+			/* Check for the two wild cases. */
+			if (IPPROTO_IP == protocol) {
+				protocol = answer->protocol;
+				break;
+			}
+			if (IPPROTO_IP == answer->protocol)
+				break;
+		}
+		answer = NULL;
+	}
+
+	err = -ESOCKTNOSUPPORT;
+	if (!answer)
+		goto out_rcu_unlock;
+	err = -EPERM;
+	if (answer->capability > 0 && !capable(answer->capability))
+		goto out_rcu_unlock;
+	err = -EPROTONOSUPPORT;
+	if (!protocol)
+		goto out_rcu_unlock;
+
+	sock->ops = answer->ops;
+	answer_prot = answer->prot;
+	answer_no_check = answer->no_check;
+	answer_flags = answer->flags;
+	rcu_read_unlock();
+
+	BUG_TRAP(answer_prot->slab != NULL);
+
+	err = -ENOBUFS;
+	sk = sk_alloc(PF_INET, GFP_KERNEL, answer_prot, 1);
+	if (sk == NULL)
+		goto out;
+
+	err = 0;
+	sk->sk_no_check = answer_no_check;
+	if (INET_PROTOSW_REUSE & answer_flags)
+		sk->sk_reuse = 1;
+
+	inet = inet_sk(sk);
+
+	if (SOCK_RAW == sock->type) {
+		inet->num = protocol;
+		if (IPPROTO_RAW == protocol)
+			inet->hdrincl = 1;
+	}
+
+	if (ipv4_config.no_pmtu_disc)
+		inet->pmtudisc = IP_PMTUDISC_DONT;
+	else
+		inet->pmtudisc = IP_PMTUDISC_WANT;
+
+	inet->id = 0;
+
+	sock_init_data(sock, sk);
+
+	sk->sk_destruct	   = inet_sock_destruct;
+	sk->sk_family	   = PF_INET;
+	sk->sk_protocol	   = protocol;
+	sk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
+
+	inet->uc_ttl	= -1;
+	inet->mc_loop	= 1;
+	inet->mc_ttl	= 1;
+	inet->mc_index	= 0;
+	inet->mc_list	= NULL;
+
+#ifdef INET_REFCNT_DEBUG
+	atomic_inc(&inet_sock_nr);
+#endif
+
+	if (inet->num) {
+		/* It assumes that any protocol which allows
+		 * the user to assign a number at socket
+		 * creation time automatically
+		 * shares.
+		 */
+		inet->sport = htons(inet->num);
+		/* Add to protocol hash chains. */
+		sk->sk_prot->hash(sk);
+	}
+
+	if (sk->sk_prot->init) {
+		err = sk->sk_prot->init(sk);
+		if (err)
+			sk_common_release(sk);
+	}
+out:
+	return err;
+out_rcu_unlock:
+	rcu_read_unlock();
+	goto out;
+}
+
+
+/*
+ *	The peer socket should always be NULL (or else). When we call this
+ *	function we are destroying the object and from then on nobody
+ *	should refer to it.
+ */
+int inet_release(struct socket *sock)
+{
+	struct sock *sk = sock->sk;
+
+	if (sk) {
+		long timeout;
+
+		/* Applications forget to leave groups before exiting */
+		ip_mc_drop_socket(sk);
+
+		/* If linger is set, we don't return until the close
+		 * is complete.  Otherwise we return immediately. The
+		 * actually closing is done the same either way.
+		 *
+		 * If the close is due to the process exiting, we never
+		 * linger..
+		 */
+		timeout = 0;
+		if (sock_flag(sk, SOCK_LINGER) &&
+		    !(current->flags & PF_EXITING))
+			timeout = sk->sk_lingertime;
+		sock->sk = NULL;
+		sk->sk_prot->close(sk, timeout);
+	}
+	return 0;
+}
+
+/* It is off by default, see below. */
+int sysctl_ip_nonlocal_bind;
+
+int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
+{
+	struct sockaddr_in *addr = (struct sockaddr_in *)uaddr;
+	struct sock *sk = sock->sk;
+	struct inet_sock *inet = inet_sk(sk);
+	unsigned short snum;
+	int chk_addr_ret;
+	int err;
+
+	/* If the socket has its own bind function then use it. (RAW) */
+	if (sk->sk_prot->bind) {
+		err = sk->sk_prot->bind(sk, uaddr, addr_len);
+		goto out;
+	}
+	err = -EINVAL;
+	if (addr_len < sizeof(struct sockaddr_in))
+		goto out;
+
+	chk_addr_ret = inet_addr_type(addr->sin_addr.s_addr);
+
+	/* Not specified by any standard per-se, however it breaks too
+	 * many applications when removed.  It is unfortunate since
+	 * allowing applications to make a non-local bind solves
+	 * several problems with systems using dynamic addressing.
+	 * (ie. your servers still start up even if your ISDN link
+	 *  is temporarily down)
+	 */
+	err = -EADDRNOTAVAIL;
+	if (!sysctl_ip_nonlocal_bind &&
+	    !inet->freebind &&
+	    addr->sin_addr.s_addr != INADDR_ANY &&
+	    chk_addr_ret != RTN_LOCAL &&
+	    chk_addr_ret != RTN_MULTICAST &&
+	    chk_addr_ret != RTN_BROADCAST)
+		goto out;
+
+	snum = ntohs(addr->sin_port);
+	err = -EACCES;
+	if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
+		goto out;
+
+	/*      We keep a pair of addresses. rcv_saddr is the one
+	 *      used by hash lookups, and saddr is used for transmit.
+	 *
+	 *      In the BSD API these are the same except where it
+	 *      would be illegal to use them (multicast/broadcast) in
+	 *      which case the sending device address is used.
+	 */
+	lock_sock(sk);
+
+	/* Check these errors (active socket, double bind). */
+	err = -EINVAL;
+	if (sk->sk_state != TCP_CLOSE || inet->num)
+		goto out_release_sock;
+
+	inet->rcv_saddr = inet->saddr = addr->sin_addr.s_addr;
+	if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST)
+		inet->saddr = 0;  /* Use device */
+
+	/* Make sure we are allowed to bind here. */
+	if (sk->sk_prot->get_port(sk, snum)) {
+		inet->saddr = inet->rcv_saddr = 0;
+		err = -EADDRINUSE;
+		goto out_release_sock;
+	}
+
+	if (inet->rcv_saddr)
+		sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
+	if (snum)
+		sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
+	inet->sport = htons(inet->num);
+	inet->daddr = 0;
+	inet->dport = 0;
+	sk_dst_reset(sk);
+	err = 0;
+out_release_sock:
+	release_sock(sk);
+out:
+	return err;
+}
+
+int inet_dgram_connect(struct socket *sock, struct sockaddr * uaddr,
+		       int addr_len, int flags)
+{
+	struct sock *sk = sock->sk;
+
+	if (uaddr->sa_family == AF_UNSPEC)
+		return sk->sk_prot->disconnect(sk, flags);
+
+	if (!inet_sk(sk)->num && inet_autobind(sk))
+		return -EAGAIN;
+	return sk->sk_prot->connect(sk, (struct sockaddr *)uaddr, addr_len);
+}
+
+static long inet_wait_for_connect(struct sock *sk, long timeo)
+{
+	DEFINE_WAIT(wait);
+
+	prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
+
+	/* Basic assumption: if someone sets sk->sk_err, he _must_
+	 * change state of the socket from TCP_SYN_*.
+	 * Connect() does not allow to get error notifications
+	 * without closing the socket.
+	 */
+	while ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
+		release_sock(sk);
+		timeo = schedule_timeout(timeo);
+		lock_sock(sk);
+		if (signal_pending(current) || !timeo)
+			break;
+		prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
+	}
+	finish_wait(sk->sk_sleep, &wait);
+	return timeo;
+}
+
+/*
+ *	Connect to a remote host. There is regrettably still a little
+ *	TCP 'magic' in here.
+ */
+int inet_stream_connect(struct socket *sock, struct sockaddr *uaddr,
+			int addr_len, int flags)
+{
+	struct sock *sk = sock->sk;
+	int err;
+	long timeo;
+
+	lock_sock(sk);
+
+	if (uaddr->sa_family == AF_UNSPEC) {
+		err = sk->sk_prot->disconnect(sk, flags);
+		sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED;
+		goto out;
+	}
+
+	switch (sock->state) {
+	default:
+		err = -EINVAL;
+		goto out;
+	case SS_CONNECTED:
+		err = -EISCONN;
+		goto out;
+	case SS_CONNECTING:
+		err = -EALREADY;
+		/* Fall out of switch with err, set for this state */
+		break;
+	case SS_UNCONNECTED:
+		err = -EISCONN;
+		if (sk->sk_state != TCP_CLOSE)
+			goto out;
+
+		err = sk->sk_prot->connect(sk, uaddr, addr_len);
+		if (err < 0)
+			goto out;
+
+  		sock->state = SS_CONNECTING;
+
+		/* Just entered SS_CONNECTING state; the only
+		 * difference is that return value in non-blocking
+		 * case is EINPROGRESS, rather than EALREADY.
+		 */
+		err = -EINPROGRESS;
+		break;
+	}
+
+	timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
+
+	if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
+		/* Error code is set above */
+		if (!timeo || !inet_wait_for_connect(sk, timeo))
+			goto out;
+
+		err = sock_intr_errno(timeo);
+		if (signal_pending(current))
+			goto out;
+	}
+
+	/* Connection was closed by RST, timeout, ICMP error
+	 * or another process disconnected us.
+	 */
+	if (sk->sk_state == TCP_CLOSE)
+		goto sock_error;
+
+	/* sk->sk_err may be not zero now, if RECVERR was ordered by user
+	 * and error was received after socket entered established state.
+	 * Hence, it is handled normally after connect() return successfully.
+	 */
+
+	sock->state = SS_CONNECTED;
+	err = 0;
+out:
+	release_sock(sk);
+	return err;
+
+sock_error:
+	err = sock_error(sk) ? : -ECONNABORTED;
+	sock->state = SS_UNCONNECTED;
+	if (sk->sk_prot->disconnect(sk, flags))
+		sock->state = SS_DISCONNECTING;
+	goto out;
+}
+
+/*
+ *	Accept a pending connection. The TCP layer now gives BSD semantics.
+ */
+
+int inet_accept(struct socket *sock, struct socket *newsock, int flags)
+{
+	struct sock *sk1 = sock->sk;
+	int err = -EINVAL;
+	struct sock *sk2 = sk1->sk_prot->accept(sk1, flags, &err);
+
+	if (!sk2)
+		goto do_err;
+
+	lock_sock(sk2);
+
+	BUG_TRAP((1 << sk2->sk_state) &
+		 (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT | TCPF_CLOSE));
+
+	sock_graft(sk2, newsock);
+
+	newsock->state = SS_CONNECTED;
+	err = 0;
+	release_sock(sk2);
+do_err:
+	return err;
+}
+
+
+/*
+ *	This does both peername and sockname.
+ */
+int inet_getname(struct socket *sock, struct sockaddr *uaddr,
+			int *uaddr_len, int peer)
+{
+	struct sock *sk		= sock->sk;
+	struct inet_sock *inet	= inet_sk(sk);
+	struct sockaddr_in *sin	= (struct sockaddr_in *)uaddr;
+
+	sin->sin_family = AF_INET;
+	if (peer) {
+		if (!inet->dport ||
+		    (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
+		     peer == 1))
+			return -ENOTCONN;
+		sin->sin_port = inet->dport;
+		sin->sin_addr.s_addr = inet->daddr;
+	} else {
+		__u32 addr = inet->rcv_saddr;
+		if (!addr)
+			addr = inet->saddr;
+		sin->sin_port = inet->sport;
+		sin->sin_addr.s_addr = addr;
+	}
+	memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
+	*uaddr_len = sizeof(*sin);
+	return 0;
+}
+
+int inet_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg,
+		 size_t size)
+{
+	struct sock *sk = sock->sk;
+
+	/* We may need to bind the socket. */
+	if (!inet_sk(sk)->num && inet_autobind(sk))
+		return -EAGAIN;
+
+	return sk->sk_prot->sendmsg(iocb, sk, msg, size);
+}
+
+
+static ssize_t inet_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
+{
+	struct sock *sk = sock->sk;
+
+	/* We may need to bind the socket. */
+	if (!inet_sk(sk)->num && inet_autobind(sk))
+		return -EAGAIN;
+
+	if (sk->sk_prot->sendpage)
+		return sk->sk_prot->sendpage(sk, page, offset, size, flags);
+	return sock_no_sendpage(sock, page, offset, size, flags);
+}
+
+
+int inet_shutdown(struct socket *sock, int how)
+{
+	struct sock *sk = sock->sk;
+	int err = 0;
+
+	/* This should really check to make sure
+	 * the socket is a TCP socket. (WHY AC...)
+	 */
+	how++; /* maps 0->1 has the advantage of making bit 1 rcvs and
+		       1->2 bit 2 snds.
+		       2->3 */
+	if ((how & ~SHUTDOWN_MASK) || !how)	/* MAXINT->0 */
+		return -EINVAL;
+
+	lock_sock(sk);
+	if (sock->state == SS_CONNECTING) {
+		if ((1 << sk->sk_state) &
+		    (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE))
+			sock->state = SS_DISCONNECTING;
+		else
+			sock->state = SS_CONNECTED;
+	}
+
+	switch (sk->sk_state) {
+	case TCP_CLOSE:
+		err = -ENOTCONN;
+		/* Hack to wake up other listeners, who can poll for
+		   POLLHUP, even on eg. unconnected UDP sockets -- RR */
+	default:
+		sk->sk_shutdown |= how;
+		if (sk->sk_prot->shutdown)
+			sk->sk_prot->shutdown(sk, how);
+		break;
+
+	/* Remaining two branches are temporary solution for missing
+	 * close() in multithreaded environment. It is _not_ a good idea,
+	 * but we have no choice until close() is repaired at VFS level.
+	 */
+	case TCP_LISTEN:
+		if (!(how & RCV_SHUTDOWN))
+			break;
+		/* Fall through */
+	case TCP_SYN_SENT:
+		err = sk->sk_prot->disconnect(sk, O_NONBLOCK);
+		sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED;
+		break;
+	}
+
+	/* Wake up anyone sleeping in poll. */
+	sk->sk_state_change(sk);
+	release_sock(sk);
+	return err;
+}
+
+/*
+ *	ioctl() calls you can issue on an INET socket. Most of these are
+ *	device configuration and stuff and very rarely used. Some ioctls
+ *	pass on to the socket itself.
+ *
+ *	NOTE: I like the idea of a module for the config stuff. ie ifconfig
+ *	loads the devconfigure module does its configuring and unloads it.
+ *	There's a good 20K of config code hanging around the kernel.
+ */
+
+int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
+{
+	struct sock *sk = sock->sk;
+	int err = 0;
+
+	switch (cmd) {
+		case SIOCGSTAMP:
+			err = sock_get_timestamp(sk, (struct timeval __user *)arg);
+			break;
+		case SIOCADDRT:
+		case SIOCDELRT:
+		case SIOCRTMSG:
+			err = ip_rt_ioctl(cmd, (void __user *)arg);
+			break;
+		case SIOCDARP:
+		case SIOCGARP:
+		case SIOCSARP:
+			err = arp_ioctl(cmd, (void __user *)arg);
+			break;
+		case SIOCGIFADDR:
+		case SIOCSIFADDR:
+		case SIOCGIFBRDADDR:
+		case SIOCSIFBRDADDR:
+		case SIOCGIFNETMASK:
+		case SIOCSIFNETMASK:
+		case SIOCGIFDSTADDR:
+		case SIOCSIFDSTADDR:
+		case SIOCSIFPFLAGS:
+		case SIOCGIFPFLAGS:
+		case SIOCSIFFLAGS:
+			err = devinet_ioctl(cmd, (void __user *)arg);
+			break;
+		default:
+			if (!sk->sk_prot->ioctl ||
+			    (err = sk->sk_prot->ioctl(sk, cmd, arg)) ==
+			    					-ENOIOCTLCMD)
+				err = dev_ioctl(cmd, (void __user *)arg);
+			break;
+	}
+	return err;
+}
+
+struct proto_ops inet_stream_ops = {
+	.family =	PF_INET,
+	.owner =	THIS_MODULE,
+	.release =	inet_release,
+	.bind =		inet_bind,
+	.connect =	inet_stream_connect,
+	.socketpair =	sock_no_socketpair,
+	.accept =	inet_accept,
+	.getname =	inet_getname,
+	.poll =		tcp_poll,
+	.ioctl =	inet_ioctl,
+	.listen =	inet_listen,
+	.shutdown =	inet_shutdown,
+	.setsockopt =	sock_common_setsockopt,
+	.getsockopt =	sock_common_getsockopt,
+	.sendmsg =	inet_sendmsg,
+	.recvmsg =	sock_common_recvmsg,
+	.mmap =		sock_no_mmap,
+	.sendpage =	tcp_sendpage
+};
+
+struct proto_ops inet_dgram_ops = {
+	.family =	PF_INET,
+	.owner =	THIS_MODULE,
+	.release =	inet_release,
+	.bind =		inet_bind,
+	.connect =	inet_dgram_connect,
+	.socketpair =	sock_no_socketpair,
+	.accept =	sock_no_accept,
+	.getname =	inet_getname,
+	.poll =		udp_poll,
+	.ioctl =	inet_ioctl,
+	.listen =	sock_no_listen,
+	.shutdown =	inet_shutdown,
+	.setsockopt =	sock_common_setsockopt,
+	.getsockopt =	sock_common_getsockopt,
+	.sendmsg =	inet_sendmsg,
+	.recvmsg =	sock_common_recvmsg,
+	.mmap =		sock_no_mmap,
+	.sendpage =	inet_sendpage,
+};
+
+/*
+ * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without
+ * udp_poll
+ */
+static struct proto_ops inet_sockraw_ops = {
+	.family =	PF_INET,
+	.owner =	THIS_MODULE,
+	.release =	inet_release,
+	.bind =		inet_bind,
+	.connect =	inet_dgram_connect,
+	.socketpair =	sock_no_socketpair,
+	.accept =	sock_no_accept,
+	.getname =	inet_getname,
+	.poll =		datagram_poll,
+	.ioctl =	inet_ioctl,
+	.listen =	sock_no_listen,
+	.shutdown =	inet_shutdown,
+	.setsockopt =	sock_common_setsockopt,
+	.getsockopt =	sock_common_getsockopt,
+	.sendmsg =	inet_sendmsg,
+	.recvmsg =	sock_common_recvmsg,
+	.mmap =		sock_no_mmap,
+	.sendpage =	inet_sendpage,
+};
+
+static struct net_proto_family inet_family_ops = {
+	.family = PF_INET,
+	.create = inet_create,
+	.owner	= THIS_MODULE,
+};
+
+
+extern void tcp_init(void);
+extern void tcp_v4_init(struct net_proto_family *);
+
+/* Upon startup we insert all the elements in inetsw_array[] into
+ * the linked list inetsw.
+ */
+static struct inet_protosw inetsw_array[] =
+{
+        {
+                .type =       SOCK_STREAM,
+                .protocol =   IPPROTO_TCP,
+                .prot =       &tcp_prot,
+                .ops =        &inet_stream_ops,
+                .capability = -1,
+                .no_check =   0,
+                .flags =      INET_PROTOSW_PERMANENT,
+        },
+
+        {
+                .type =       SOCK_DGRAM,
+                .protocol =   IPPROTO_UDP,
+                .prot =       &udp_prot,
+                .ops =        &inet_dgram_ops,
+                .capability = -1,
+                .no_check =   UDP_CSUM_DEFAULT,
+                .flags =      INET_PROTOSW_PERMANENT,
+       },
+        
+
+       {
+               .type =       SOCK_RAW,
+               .protocol =   IPPROTO_IP,	/* wild card */
+               .prot =       &raw_prot,
+               .ops =        &inet_sockraw_ops,
+               .capability = CAP_NET_RAW,
+               .no_check =   UDP_CSUM_DEFAULT,
+               .flags =      INET_PROTOSW_REUSE,
+       }
+};
+
+#define INETSW_ARRAY_LEN (sizeof(inetsw_array) / sizeof(struct inet_protosw))
+
+void inet_register_protosw(struct inet_protosw *p)
+{
+	struct list_head *lh;
+	struct inet_protosw *answer;
+	int protocol = p->protocol;
+	struct list_head *last_perm;
+
+	spin_lock_bh(&inetsw_lock);
+
+	if (p->type >= SOCK_MAX)
+		goto out_illegal;
+
+	/* If we are trying to override a permanent protocol, bail. */
+	answer = NULL;
+	last_perm = &inetsw[p->type];
+	list_for_each(lh, &inetsw[p->type]) {
+		answer = list_entry(lh, struct inet_protosw, list);
+
+		/* Check only the non-wild match. */
+		if (INET_PROTOSW_PERMANENT & answer->flags) {
+			if (protocol == answer->protocol)
+				break;
+			last_perm = lh;
+		}
+
+		answer = NULL;
+	}
+	if (answer)
+		goto out_permanent;
+
+	/* Add the new entry after the last permanent entry if any, so that
+	 * the new entry does not override a permanent entry when matched with
+	 * a wild-card protocol. But it is allowed to override any existing
+	 * non-permanent entry.  This means that when we remove this entry, the 
+	 * system automatically returns to the old behavior.
+	 */
+	list_add_rcu(&p->list, last_perm);
+out:
+	spin_unlock_bh(&inetsw_lock);
+
+	synchronize_net();
+
+	return;
+
+out_permanent:
+	printk(KERN_ERR "Attempt to override permanent protocol %d.\n",
+	       protocol);
+	goto out;
+
+out_illegal:
+	printk(KERN_ERR
+	       "Ignoring attempt to register invalid socket type %d.\n",
+	       p->type);
+	goto out;
+}
+
+void inet_unregister_protosw(struct inet_protosw *p)
+{
+	if (INET_PROTOSW_PERMANENT & p->flags) {
+		printk(KERN_ERR
+		       "Attempt to unregister permanent protocol %d.\n",
+		       p->protocol);
+	} else {
+		spin_lock_bh(&inetsw_lock);
+		list_del_rcu(&p->list);
+		spin_unlock_bh(&inetsw_lock);
+
+		synchronize_net();
+	}
+}
+
+#ifdef CONFIG_IP_MULTICAST
+static struct net_protocol igmp_protocol = {
+	.handler =	igmp_rcv,
+};
+#endif
+
+static struct net_protocol tcp_protocol = {
+	.handler =	tcp_v4_rcv,
+	.err_handler =	tcp_v4_err,
+	.no_policy =	1,
+};
+
+static struct net_protocol udp_protocol = {
+	.handler =	udp_rcv,
+	.err_handler =	udp_err,
+	.no_policy =	1,
+};
+
+static struct net_protocol icmp_protocol = {
+	.handler =	icmp_rcv,
+};
+
+static int __init init_ipv4_mibs(void)
+{
+	net_statistics[0] = alloc_percpu(struct linux_mib);
+	net_statistics[1] = alloc_percpu(struct linux_mib);
+	ip_statistics[0] = alloc_percpu(struct ipstats_mib);
+	ip_statistics[1] = alloc_percpu(struct ipstats_mib);
+	icmp_statistics[0] = alloc_percpu(struct icmp_mib);
+	icmp_statistics[1] = alloc_percpu(struct icmp_mib);
+	tcp_statistics[0] = alloc_percpu(struct tcp_mib);
+	tcp_statistics[1] = alloc_percpu(struct tcp_mib);
+	udp_statistics[0] = alloc_percpu(struct udp_mib);
+	udp_statistics[1] = alloc_percpu(struct udp_mib);
+	if (!
+	    (net_statistics[0] && net_statistics[1] && ip_statistics[0]
+	     && ip_statistics[1] && tcp_statistics[0] && tcp_statistics[1]
+	     && udp_statistics[0] && udp_statistics[1]))
+		return -ENOMEM;
+
+	(void) tcp_mib_init();
+
+	return 0;
+}
+
+static int ipv4_proc_init(void);
+extern void ipfrag_init(void);
+
+static int __init inet_init(void)
+{
+	struct sk_buff *dummy_skb;
+	struct inet_protosw *q;
+	struct list_head *r;
+	int rc = -EINVAL;
+
+	if (sizeof(struct inet_skb_parm) > sizeof(dummy_skb->cb)) {
+		printk(KERN_CRIT "%s: panic\n", __FUNCTION__);
+		goto out;
+	}
+
+	rc = proto_register(&tcp_prot, 1);
+	if (rc)
+		goto out;
+
+	rc = proto_register(&udp_prot, 1);
+	if (rc)
+		goto out_unregister_tcp_proto;
+
+	rc = proto_register(&raw_prot, 1);
+	if (rc)
+		goto out_unregister_udp_proto;
+
+	/*
+	 *	Tell SOCKET that we are alive... 
+	 */
+
+  	(void)sock_register(&inet_family_ops);
+
+	/*
+	 *	Add all the base protocols.
+	 */
+
+	if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0)
+		printk(KERN_CRIT "inet_init: Cannot add ICMP protocol\n");
+	if (inet_add_protocol(&udp_protocol, IPPROTO_UDP) < 0)
+		printk(KERN_CRIT "inet_init: Cannot add UDP protocol\n");
+	if (inet_add_protocol(&tcp_protocol, IPPROTO_TCP) < 0)
+		printk(KERN_CRIT "inet_init: Cannot add TCP protocol\n");
+#ifdef CONFIG_IP_MULTICAST
+	if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0)
+		printk(KERN_CRIT "inet_init: Cannot add IGMP protocol\n");
+#endif
+
+	/* Register the socket-side information for inet_create. */
+	for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r)
+		INIT_LIST_HEAD(r);
+
+	for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q)
+		inet_register_protosw(q);
+
+	/*
+	 *	Set the ARP module up
+	 */
+
+	arp_init();
+
+  	/*
+  	 *	Set the IP module up
+  	 */
+
+	ip_init();
+
+	tcp_v4_init(&inet_family_ops);
+
+	/* Setup TCP slab cache for open requests. */
+	tcp_init();
+
+
+	/*
+	 *	Set the ICMP layer up
+	 */
+
+	icmp_init(&inet_family_ops);
+
+	/*
+	 *	Initialise the multicast router
+	 */
+#if defined(CONFIG_IP_MROUTE)
+	ip_mr_init();
+#endif
+	/*
+	 *	Initialise per-cpu ipv4 mibs
+	 */ 
+
+	if(init_ipv4_mibs())
+		printk(KERN_CRIT "inet_init: Cannot init ipv4 mibs\n"); ;
+	
+	ipv4_proc_init();
+
+	ipfrag_init();
+
+	rc = 0;
+out:
+	return rc;
+out_unregister_tcp_proto:
+	proto_unregister(&tcp_prot);
+out_unregister_udp_proto:
+	proto_unregister(&udp_prot);
+	goto out;
+}
+
+module_init(inet_init);
+
+/* ------------------------------------------------------------------------ */
+
+#ifdef CONFIG_PROC_FS
+extern int  fib_proc_init(void);
+extern void fib_proc_exit(void);
+extern int  ip_misc_proc_init(void);
+extern int  raw_proc_init(void);
+extern void raw_proc_exit(void);
+extern int  tcp4_proc_init(void);
+extern void tcp4_proc_exit(void);
+extern int  udp4_proc_init(void);
+extern void udp4_proc_exit(void);
+
+static int __init ipv4_proc_init(void)
+{
+	int rc = 0;
+
+	if (raw_proc_init())
+		goto out_raw;
+	if (tcp4_proc_init())
+		goto out_tcp;
+	if (udp4_proc_init())
+		goto out_udp;
+	if (fib_proc_init())
+		goto out_fib;
+	if (ip_misc_proc_init())
+		goto out_misc;
+out:
+	return rc;
+out_misc:
+	fib_proc_exit();
+out_fib:
+	udp4_proc_exit();
+out_udp:
+	tcp4_proc_exit();
+out_tcp:
+	raw_proc_exit();
+out_raw:
+	rc = -ENOMEM;
+	goto out;
+}
+
+#else /* CONFIG_PROC_FS */
+static int __init ipv4_proc_init(void)
+{
+	return 0;
+}
+#endif /* CONFIG_PROC_FS */
+
+MODULE_ALIAS_NETPROTO(PF_INET);
+
+EXPORT_SYMBOL(inet_accept);
+EXPORT_SYMBOL(inet_bind);
+EXPORT_SYMBOL(inet_dgram_connect);
+EXPORT_SYMBOL(inet_dgram_ops);
+EXPORT_SYMBOL(inet_getname);
+EXPORT_SYMBOL(inet_ioctl);
+EXPORT_SYMBOL(inet_listen);
+EXPORT_SYMBOL(inet_register_protosw);
+EXPORT_SYMBOL(inet_release);
+EXPORT_SYMBOL(inet_sendmsg);
+EXPORT_SYMBOL(inet_shutdown);
+EXPORT_SYMBOL(inet_sock_destruct);
+EXPORT_SYMBOL(inet_stream_connect);
+EXPORT_SYMBOL(inet_stream_ops);
+EXPORT_SYMBOL(inet_unregister_protosw);
+EXPORT_SYMBOL(net_statistics);
+
+#ifdef INET_REFCNT_DEBUG
+EXPORT_SYMBOL(inet_sock_nr);
+#endif