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- /****************************************************************************
- * net/utils/net_tcpchksum.c
- *
- * Licensed to the Apache Software Foundation (ASF) under one or more
- * contributor license agreements. See the NOTICE file distributed with
- * this work for additional information regarding copyright ownership. The
- * ASF licenses this file to you under the Apache License, Version 2.0 (the
- * "License"); you may not use this file except in compliance with the
- * License. You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
- * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
- * License for the specific language governing permissions and limitations
- * under the License.
- *
- ****************************************************************************/
- /****************************************************************************
- * Included Files
- ****************************************************************************/
- #include <nuttx/config.h>
- #include <nuttx/net/netdev.h>
- #include "utils/utils.h"
- #ifdef CONFIG_NET_TCP
- /****************************************************************************
- * Public Functions
- ****************************************************************************/
- /****************************************************************************
- * Name: tcp_chksum, tcp_ipv4_chksum, and tcp_ipv6_chksum
- *
- * Description:
- * Calculate the TCP checksum of the packet in d_buf and d_appdata.
- *
- * The TCP checksum is the Internet checksum of data contents of the
- * TCP segment, and a pseudo-header as defined in RFC793.
- *
- * Note: The d_appdata pointer that points to the packet data may
- * point anywhere in memory, so it is not possible to simply calculate
- * the Internet checksum of the contents of the d_buf buffer.
- *
- * Returned Value:
- * The TCP checksum of the TCP segment in d_buf and pointed to by
- * d_appdata.
- *
- ****************************************************************************/
- #ifdef CONFIG_NET_IPv4
- uint16_t tcp_ipv4_chksum(FAR struct net_driver_s *dev)
- {
- return ipv4_upperlayer_chksum(dev, IP_PROTO_TCP);
- }
- #endif /* CONFIG_NET_IPv4 */
- #ifdef CONFIG_NET_IPv6
- uint16_t tcp_ipv6_chksum(FAR struct net_driver_s *dev)
- {
- return ipv6_upperlayer_chksum(dev, IP_PROTO_TCP, IPv6_HDRLEN);
- }
- #endif /* CONFIG_NET_IPv6 */
- #if defined(CONFIG_NET_IPv4) && defined(CONFIG_NET_IPv6)
- uint16_t tcp_chksum(FAR struct net_driver_s *dev)
- {
- if (IFF_IS_IPv6(dev->d_flags))
- {
- return tcp_ipv6_chksum(dev);
- }
- else
- {
- return tcp_ipv4_chksum(dev);
- }
- }
- #endif
- #endif /* CONFIG_NET_TCP */
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