100 lines
3.6 KiB
C
100 lines
3.6 KiB
C
/****************************************************************************
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* net/utils/net_tcpchksum.c
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*
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* Copyright (C) 2007-2010, 2012, 2014-2015, 2017 Gregory Nutt. All
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* rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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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
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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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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#include <nuttx/net/netdev.h>
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#include "utils/utils.h"
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#ifdef CONFIG_NET_TCP
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: tcp_chksum, tcp_ipv4_chksum, and tcp_ipv6_chksum
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*
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* Description:
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* Calculate the TCP checksum of the packet in d_buf and d_appdata.
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*
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* The TCP checksum is the Internet checksum of data contents of the
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* TCP segment, and a pseudo-header as defined in RFC793.
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*
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* Note: The d_appdata pointer that points to the packet data may
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* point anywhere in memory, so it is not possible to simply calculate
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* the Internet checksum of the contents of the d_buf buffer.
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*
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* Returned Value:
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* The TCP checksum of the TCP segment in d_buf and pointed to by
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* d_appdata.
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*
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****************************************************************************/
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#ifdef CONFIG_NET_IPv4
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uint16_t tcp_ipv4_chksum(FAR struct net_driver_s *dev)
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{
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return ipv4_upperlayer_chksum(dev, IP_PROTO_TCP);
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}
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#endif /* CONFIG_NET_IPv4 */
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#ifdef CONFIG_NET_IPv6
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uint16_t tcp_ipv6_chksum(FAR struct net_driver_s *dev)
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{
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return ipv6_upperlayer_chksum(dev, IP_PROTO_TCP, IPv6_HDRLEN);
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}
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#endif /* CONFIG_NET_IPv6 */
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#if defined(CONFIG_NET_IPv4) && defined(CONFIG_NET_IPv6)
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uint16_t tcp_chksum(FAR struct net_driver_s *dev)
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{
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if (IFF_IS_IPv6(dev->d_flags))
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{
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return tcp_ipv6_chksum(dev);
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}
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else
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{
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return tcp_ipv4_chksum(dev);
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}
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}
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#endif
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#endif /* CONFIG_NET_TCP */
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