uip.c

AX88796B keil 8051 驱动

/**
 * \addtogroup uip
 * @{
 */

/**
 * \file
 * The uIP TCP/IP stack code.
 * \author Adam Dunkels <[e-mail]>
 */

/*
 * Copyright (c) 2001-2003, Adam Dunkels.
 * All rights reserved. 
 *
 * Redistribution and use in source and binary forms, with or without 
 * modification, are permitted provided that the following conditions 
 * are met: 
 * 1. Redistributions of source code must retain the above copyright 
 *    notice, this list of conditions and the following disclaimer. 
 * 2. Redistributions in binary form must reproduce the above copyright 
 *    notice, this list of conditions and the following disclaimer in the 
 *    documentation and/or other materials provided with the distribution. 
 * 3. The name of the author may not be used to endorse or promote
 *    products derived from this software without specific prior
 *    written permission.  
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
 * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.  
 *
 * This file is part of the uIP TCP/IP stack.
 *
 * $Id: uip.c,v 1.62.2.10 2003/10/07 13:23:01 adam Exp $
 *
 */

/*
This is a small implementation of the IP and TCP protocols (as well as
some basic ICMP stuff). The implementation couples the IP, TCP and the
application layers very tightly. To keep the size of the compiled code
down, this code also features heavy usage of the goto statement.

The principle is that we have a small buffer, called the uip_buf, in
which the device driver puts an incoming packet. The TCP/IP stack
parses the headers in the packet, and calls upon the application. If
the remote host has sent data to the application, this data is present
in the uip_buf and the application read the data from there. It is up
to the application to put this data into a byte stream if needed. The
application will not be fed with data that is out of sequence.

If the application whishes to send data to the peer, it should put its
data into the uip_buf, 40 bytes from the start of the buffer. The
TCP/IP stack will calculate the checksums, and fill in the necessary
header fields and finally send the packet back to the peer.
*/

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