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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_udp.h"
#include "nx_ipv4.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _nx_udp_socket_extract PORTABLE C */
/* 6.4.3 */
/* AUTHOR */
/* */
/* Yuxin Zhou, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function extracts the source IP and UDP port number from the */
/* supplied packet. */
/* */
/* INPUT */
/* */
/* packet_ptr Pointer to UDP packet pointer */
/* ip_address Pointer to packet source IP */
/* address */
/* port Pointer to source UDP port */
/* */
/* OUTPUT */
/* */
/* NX_SUCCESS Successful completion status */
/* */
/* CALLS */
/* */
/* None */
/* */
/* CALLED BY */
/* */
/* Application Code */
/* */
/**************************************************************************/
UINT _nx_udp_source_extract(NX_PACKET *packet_ptr, ULONG *ip_address, UINT *port)
{
#ifndef NX_DISABLE_IPV4
ULONG *temp_ptr;
NX_IPV4_HEADER *ipv4_header;
/* Build an address to the current top of the packet. */
/*lint -e{927} -e{826} suppress cast of pointer to pointer, since it is necessary */
temp_ptr = (ULONG *)packet_ptr -> nx_packet_prepend_ptr;
/* Pickup the source port. */
*port = (UINT)(*(temp_ptr - 2) >> NX_SHIFT_BY_16);
/* Obtain the IPv4 header. */
/*lint -e{927} -e{826} suppress cast of pointer to pointer, since it is necessary */
ipv4_header = (NX_IPV4_HEADER *)packet_ptr -> nx_packet_ip_header;
/* Pickup the source IP address. */
*ip_address = ipv4_header -> nx_ip_header_source_ip;
/* If trace is enabled, insert this event into the trace buffer. */
NX_TRACE_IN_LINE_INSERT(NX_TRACE_UDP_SOURCE_EXTRACT, packet_ptr, *ip_address, *port, 0, NX_TRACE_UDP_EVENTS, 0, 0);
return(NX_SUCCESS);
#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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