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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 */
/** */
/** User Datagram Protocol (UDP) */
/** */
/**************************************************************************/
/**************************************************************************/
#define NX_SOURCE_CODE
/* Include necessary system files. */
#include "nx_api.h"
#include "nx_ip.h"
#include "nx_udp.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _nxe_udp_source_extract PORTABLE C */
/* 6.4.3 */
/* AUTHOR */
/* */
/* Yuxin Zhou, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function checks for errors in the extract UDP source call. */
/* */
/* INPUT */
/* */
/* packet_ptr Pointer to UDP packet pointer */
/* ip_address Pointer to packet source IP */
/* address */
/* port Pointer to source UDP port */
/* */
/* OUTPUT */
/* */
/* status Actual completion status */
/* NX_PTR_ERROR Invalid pointer input */
/* NX_INVALID_PACKET Malformed packet to process */
/* */
/* CALLS */
/* */
/* _nx_udp_source_extract Actual UDP source extract */
/* function */
/* */
/* CALLED BY */
/* */
/* Application Code */
/* */
/**************************************************************************/
UINT _nxe_udp_source_extract(NX_PACKET *packet_ptr, ULONG *ip_address, UINT *port)
{
#ifndef NX_DISABLE_IPV4
UINT status;
/* Check for invalid input pointers. */
if ((packet_ptr == NX_NULL) || (ip_address == NX_NULL) || (port == NX_NULL))
{
return(NX_PTR_ERROR);
}
/* Check for invalid packet pointer. */
if (packet_ptr -> nx_packet_ip_header == NX_NULL)
{
return(NX_INVALID_PACKET);
}
if (packet_ptr -> nx_packet_ip_version != NX_IP_VERSION_V4)
{
return(NX_INVALID_PACKET);
}
/* Check to see if the packet has enough room in front for backing up. */
/*lint -e{946} -e{947} suppress pointer subtraction, since it is necessary. */
if ((UINT)(packet_ptr -> nx_packet_prepend_ptr - packet_ptr -> nx_packet_data_start) <
(sizeof(NX_UDP_HEADER) + sizeof(NX_IPV4_HEADER)))
{
return(NX_INVALID_PACKET);
}
/* Call actual UDP source extract function. */
status = _nx_udp_source_extract(packet_ptr, ip_address, port);
/* Return completion status. */
return(status);
#else
NX_PARAMETER_NOT_USED(packet_ptr);
NX_PARAMETER_NOT_USED(ip_address);
NX_PARAMETER_NOT_USED(port);
return(NX_NOT_SUPPORTED);
#endif /* !NX_DISABLE_IPV4 */
}
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