mirror of
https://github.com/FreeRTOS/FreeRTOS-Plus-TCP
synced 2025-10-20 13:23:44 +08:00
94 lines
3.4 KiB
C
94 lines
3.4 KiB
C
/*
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* FreeRTOS+TCP <DEVELOPMENT BRANCH>
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* Copyright (C) 2022 Amazon.com, Inc. or its affiliates. All Rights Reserved.
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*
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* SPDX-License-Identifier: MIT
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy of
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* this software and associated documentation files (the "Software"), to deal in
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* the Software without restriction, including without limitation the rights to
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* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
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* the Software, and to permit persons to whom the Software is furnished to do so,
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* subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
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* FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
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* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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* http://aws.amazon.com/freertos
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* http://www.FreeRTOS.org
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*/
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/**
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* @file FreeRTOS_TCP_Utils_IPv4.c
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* @brief Module contains utility functions used by FreeRTOS+TCP module.
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*
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* Endianness: in this module all ports and IP addresses are stored in
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* host byte-order, except fields in the IP-packets
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*/
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/* Standard includes. */
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#include <stdint.h>
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#include <stdio.h>
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/* FreeRTOS includes. */
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#include "FreeRTOS.h"
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/* FreeRTOS+TCP includes. */
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#include "FreeRTOS_IP.h"
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#include "FreeRTOS_IP_Private.h"
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#include "FreeRTOS_TCP_Utils.h"
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/* Just make sure the contents doesn't get compiled if TCP is not enabled. */
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/* *INDENT-OFF* */
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#if( ipconfigUSE_IPv4 != 0 ) && ( ipconfigUSE_TCP == 1 )
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/* *INDENT-ON* */
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/**
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* @brief Set the MSS (Maximum segment size) associated with the given socket.
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*
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* @param[in] pxSocket The socket whose MSS is to be set.
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*/
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void prvSocketSetMSS_IPV4( FreeRTOS_Socket_t * pxSocket )
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{
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uint32_t ulMSS = ipconfigTCP_MSS;
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const NetworkEndPoint_t * pxEndPoint = pxSocket->pxEndPoint;
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if( pxEndPoint != NULL )
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{
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/* Do not allow MSS smaller than tcpMINIMUM_SEGMENT_LENGTH. */
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#if ( ipconfigTCP_MSS >= tcpMINIMUM_SEGMENT_LENGTH )
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{
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ulMSS = ipconfigTCP_MSS;
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}
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#else
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{
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ulMSS = tcpMINIMUM_SEGMENT_LENGTH;
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}
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#endif
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/* Check if the remote IP-address belongs to the same netmask. */
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if( ( ( FreeRTOS_ntohl( pxSocket->u.xTCP.xRemoteIP.ulIP_IPv4 ) ^ pxEndPoint->ipv4_settings.ulIPAddress ) & pxEndPoint->ipv4_settings.ulNetMask ) != 0U )
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{
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/* Data for this peer will pass through a router, and maybe through
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* the internet. Limit the MSS to 1400 bytes or less. */
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ulMSS = FreeRTOS_min_uint32( ( uint32_t ) tcpREDUCED_MSS_THROUGH_INTERNET, ulMSS );
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}
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}
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FreeRTOS_debug_printf( ( "prvSocketSetMSS: %u bytes for %xip port %u\n", ( unsigned ) ulMSS, ( unsigned ) pxSocket->u.xTCP.xRemoteIP.ulIP_IPv4, pxSocket->u.xTCP.usRemotePort ) );
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pxSocket->u.xTCP.usMSS = ( uint16_t ) ulMSS;
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}
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/*-----------------------------------------------------------*/
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/* *INDENT-OFF* */
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#endif /* ( ipconfigUSE_IPv4 != 0 ) && ( ipconfigUSE_TCP == 1 ) */
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/* *INDENT-ON* */
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