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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_tcp.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _nx_tcp_socket_mss_get PORTABLE C */
/* 6.4.3 */
/* AUTHOR */
/* */
/* Yuxin Zhou, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function retrieves local TCP Maximum Segment Size (MSS) for */
/* for specified TCP socket. */
/* */
/* INPUT */
/* */
/* socket_ptr Pointer to the TCP socket */
/* mss Destination 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_get(NX_TCP_SOCKET *socket_ptr, ULONG *mss)
{
NX_IP *ip_ptr;
/* Setup IP pointer. */
ip_ptr = socket_ptr -> nx_tcp_socket_ip_ptr;
/* 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_ESTABLISHED)
{
/* The socket is not connected. */
if (socket_ptr -> nx_tcp_socket_mss)
{
/* Return custom MSS. */
*mss = socket_ptr -> nx_tcp_socket_mss;
}
else
{
/* Return default MSS. */
*mss = NX_TCP_MSS_SIZE;
}
}
else
{
/* Pickup SMSS value. */
*mss = socket_ptr -> nx_tcp_socket_connect_mss;
}
/* Release protection. */
tx_mutex_put(&(ip_ptr -> nx_ip_protection));
/* If trace is enabled, insert this event into the trace buffer. */
NX_TRACE_IN_LINE_INSERT(NX_TRACE_TCP_SOCKET_MSS_GET, ip_ptr, socket_ptr, *mss, socket_ptr -> nx_tcp_socket_state, NX_TRACE_TCP_EVENTS, 0, 0);
/* Return successful completion status. */
return(NX_SUCCESS);
}
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