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/***************************************************************************
* Copyright (c) 2024 Microsoft Corporation
* Copyright (c) 2025-present Eclipse ThreadX Contributors
*
* This program and the accompanying materials are made available under the
* terms of the MIT License which is available at
* https://opensource.org/licenses/MIT.
*
* SPDX-License-Identifier: MIT
**************************************************************************/
/**************************************************************************/
/**************************************************************************/
/** */
/** NetX Component */
/** */
/** Transmission Control Protocol (TCP) */
/** */
/**************************************************************************/
/**************************************************************************/
#define NX_SOURCE_CODE
/* Include necessary system files. */
#include "nx_api.h"
#include "nx_ip.h"
#include "nx_tcp.h"
#include "nx_ipv6.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _nx_tcp_socket_mss_set PORTABLE C */
/* 6.4.3 */
/* AUTHOR */
/* */
/* Yuxin Zhou, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function sets the TCP Maximum Segment Size (MSS) for the */
/* specified TCP socket. */
/* */
/* INPUT */
/* */
/* socket_ptr Pointer to the TCP socket */
/* mss New value for the MSS */
/* */
/* OUTPUT */
/* */
/* status Completion status */
/* */
/* CALLS */
/* */
/* tx_mutex_get Obtain protection */
/* tx_mutex_put Release protection */
/* */
/* CALLED BY */
/* */
/* Application Code */
/* */
/**************************************************************************/
UINT _nx_tcp_socket_mss_set(NX_TCP_SOCKET *socket_ptr, ULONG mss)
{
NX_IP *ip_ptr;
UINT status;
/* Setup IP pointer. */
ip_ptr = socket_ptr -> nx_tcp_socket_ip_ptr;
if (mss == 0)
{
/* Invalid MSS, return an error. */
return(NX_SIZE_ERROR);
}
/* Obtain the IP mutex so we can examine the bound port. */
tx_mutex_get(&(ip_ptr -> nx_ip_protection), TX_WAIT_FOREVER);
if (socket_ptr -> nx_tcp_socket_state < NX_TCP_SYN_SENT)
{
/* Set the socket's MSS value. */
socket_ptr -> nx_tcp_socket_mss = mss;
status = NX_SUCCESS;
}
else
{
/* MSS can not be modified when connection is started. */
status = NX_NOT_SUCCESSFUL;
}
/* Release protection. */
tx_mutex_put(&(ip_ptr -> nx_ip_protection));
/* Return successful completion status. */
return(status);
}
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