165 lines
5.3 KiB
C
165 lines
5.3 KiB
C
/****************************************************************************
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* net/tcp/tcp_seqno.c
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*
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* Copyright (C) 2007-2009 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Large parts of this file were leveraged from uIP logic:
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*
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* Copyright (c) 2001-2003, Adam Dunkels.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote
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* products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
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* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Compilation Switches
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#if defined(CONFIG_NET) && defined(CONFIG_NET_TCP)
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#include <stdint.h>
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#include <debug.h>
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#include <nuttx/net/netconfig.h>
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#include <nuttx/net/netdev.h>
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#include "devif/devif.h"
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/****************************************************************************
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* Private Data
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****************************************************************************/
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/* g_tcpsequence is used to generate initial TCP sequence numbers */
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static uint32_t g_tcpsequence;
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: tcp_setsequence
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*
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* Description:
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* Set the TCP/IP sequence number
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*
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* Assumptions:
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* This function may called from the interrupt level
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*
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****************************************************************************/
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void tcp_setsequence(FAR uint8_t *seqno, uint32_t value)
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{
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/* Copy the sequence number in network (big-endian) order */
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*seqno++ = value >> 24;
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*seqno++ = (value >> 16) & 0xff;
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*seqno++ = (value >> 8) & 0xff;
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*seqno = value & 0xff;
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}
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/****************************************************************************
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* Name: tcp_getsequence
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*
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* Description:
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* Get the TCP/IP sequence number
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*
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* Assumptions:
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* This function may called from the interrupt level
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*
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****************************************************************************/
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uint32_t tcp_getsequence(FAR uint8_t *seqno)
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{
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uint32_t value;
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/* Combine the sequence number from network (big-endian) order */
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value = (uint32_t)seqno[0] << 24 |
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(uint32_t)seqno[1] << 16 |
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(uint32_t)seqno[2] << 8 |
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(uint32_t)seqno[3];
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return value;
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}
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/****************************************************************************
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* Name: tcp_addsequence
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*
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* Description:
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* Add the length to get the next TCP sequence number.
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*
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* Assumptions:
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* This function may called from the interrupt level
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*
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****************************************************************************/
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uint32_t tcp_addsequence(FAR uint8_t *seqno, uint16_t len)
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{
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return tcp_getsequence(seqno) + (uint32_t)len;
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}
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/****************************************************************************
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* Name: tcp_initsequence
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*
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* Description:
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* Set the (initial) the TCP/IP sequence number when a TCP connection is
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* established.
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*
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* Assumptions:
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* This function may called from the interrupt level
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*
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****************************************************************************/
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void tcp_initsequence(FAR uint8_t *seqno)
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{
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tcp_setsequence(seqno, g_tcpsequence);
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}
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/****************************************************************************
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* Name: tcp_nextsequence
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*
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* Description:
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* Increment the TCP/IP sequence number
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*
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* Assumptions:
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* This function is called from the interrupt level
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*
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****************************************************************************/
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void tcp_nextsequence(void)
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{
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g_tcpsequence++;
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}
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#endif /* CONFIG_NET && CONFIG_NET_TCP */
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