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- /****************************************************************************
- * net/tcp/tcp_seqno.c
- *
- * Copyright (C) 2007-2009 Gregory Nutt. All rights reserved.
- * Author: Gregory Nutt <gnutt@nuttx.org>
- *
- * Large parts of this file were leveraged from uIP logic:
- *
- * 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.
- *
- ****************************************************************************/
- /****************************************************************************
- * Included Files
- ****************************************************************************/
- #include <nuttx/config.h>
- #if defined(CONFIG_NET) && defined(CONFIG_NET_TCP)
- #include <stdint.h>
- #include <debug.h>
- #include <nuttx/net/netconfig.h>
- #include <nuttx/net/netdev.h>
- #include "devif/devif.h"
- /****************************************************************************
- * Private Data
- ****************************************************************************/
- /* g_tcpsequence is used to generate initial TCP sequence numbers */
- static uint32_t g_tcpsequence;
- /****************************************************************************
- * Public Functions
- ****************************************************************************/
- /****************************************************************************
- * Name: tcp_setsequence
- *
- * Description:
- * Set the TCP/IP sequence number
- *
- * Assumptions:
- * This function must be called with the network locked if seqno refers
- * to a shared, global resource.
- *
- ****************************************************************************/
- void tcp_setsequence(FAR uint8_t *seqno, uint32_t value)
- {
- /* Copy the sequence number in network (big-endian) order */
- *seqno++ = value >> 24;
- *seqno++ = (value >> 16) & 0xff;
- *seqno++ = (value >> 8) & 0xff;
- *seqno = value & 0xff;
- }
- /****************************************************************************
- * Name: tcp_getsequence
- *
- * Description:
- * Get the TCP/IP sequence number
- *
- * Assumptions:
- * This function must be called with the network locked if seqno refers
- * to a shared, global resource.
- *
- ****************************************************************************/
- uint32_t tcp_getsequence(FAR uint8_t *seqno)
- {
- uint32_t value;
- /* Combine the sequence number from network (big-endian) order */
- value = (uint32_t)seqno[0] << 24 |
- (uint32_t)seqno[1] << 16 |
- (uint32_t)seqno[2] << 8 |
- (uint32_t)seqno[3];
- return value;
- }
- /****************************************************************************
- * Name: tcp_addsequence
- *
- * Description:
- * Add the length to get the next TCP sequence number.
- *
- * Assumptions:
- * This function must be called with the network locked if seqno refers
- * to a shared, global resource.
- *
- ****************************************************************************/
- uint32_t tcp_addsequence(FAR uint8_t *seqno, uint16_t len)
- {
- return tcp_getsequence(seqno) + (uint32_t)len;
- }
- /****************************************************************************
- * Name: tcp_initsequence
- *
- * Description:
- * Set the (initial) the TCP/IP sequence number when a TCP connection is
- * established.
- *
- * Assumptions:
- * This function must be called with the network locked if seqno refers
- * to a shared, global resource.
- *
- ****************************************************************************/
- void tcp_initsequence(FAR uint8_t *seqno)
- {
- tcp_setsequence(seqno, g_tcpsequence);
- }
- /****************************************************************************
- * Name: tcp_nextsequence
- *
- * Description:
- * Increment the TCP/IP sequence number
- *
- * Assumptions:
- * This function must be called with the network locked.
- *
- ****************************************************************************/
- void tcp_nextsequence(void)
- {
- g_tcpsequence++;
- }
- #endif /* CONFIG_NET && CONFIG_NET_TCP */
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