84 lines
2.8 KiB
C
84 lines
2.8 KiB
C
/****************************************************************************
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* net/utils/net_tcpchksum.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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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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