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/**************************************************************************/
/* */
/* Copyright (c) Microsoft Corporation. All rights reserved. */
/* */
/* This software is licensed under the Microsoft Software License */
/* Terms for Microsoft Azure RTOS. Full text of the license can be */
/* found in the LICENSE file at https://aka.ms/AzureRTOS_EULA */
/* and in the root directory of this software. */
/* */
/**************************************************************************/
/**************************************************************************/
/**************************************************************************/
/** */
/** NetX Component */
/** */
/** User Datagram Protocol (UDP) */
/** */
/**************************************************************************/
/**************************************************************************/
#define NX_SOURCE_CODE
/* Include necessary system files. */
#include "nx_api.h"
#include "nx_udp.h"
#include "nx_ipv6.h"
#include "nx_ipv4.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _nxd_udp_socket_extract PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* Yuxin Zhou, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function extracts the source IP address and UDP port number */
/* from the packet received on a host UDP socket. It is up to the */
/* caller to verify the source port and ip address are valid (non null)*/
/* data. */
/* */
/* INPUT */
/* */
/* packet_ptr Pointer to UDP packet pointer */
/* ip_address Pointer to source IP address */
/* port Pointer to source UDP port */
/* */
/* OUTPUT */
/* */
/* status Actual completion status */
/* */
/* CALLS */
/* */
/* None */
/* */
/* CALLED BY */
/* */
/* Application Code */
/* */
/* RELEASE HISTORY */
/* */
/* DATE NAME DESCRIPTION */
/* */
/* 05-19-2020 Yuxin Zhou Initial Version 6.0 */
/* 09-30-2020 Yuxin Zhou Modified comment(s), */
/* resulting in version 6.1 */
/* */
/**************************************************************************/
UINT _nxd_udp_source_extract(NX_PACKET *packet_ptr, NXD_ADDRESS *ip_address, UINT *port)
{
#ifdef TX_ENABLE_EVENT_TRACE
ULONG ip_address_word3 = 0;
ULONG ip_version;
#endif
ULONG *temp_ptr;
/* 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 from the UDP header. */
*port = (UINT)(*(temp_ptr - 2) >> NX_SHIFT_BY_16);
/* Determine IPv4 or IPv6 connectivity. */
ip_address -> nxd_ip_version = packet_ptr -> nx_packet_ip_version;
#ifndef NX_DISABLE_IPV4
if (ip_address -> nxd_ip_version == NX_IP_VERSION_V4)
{
NX_IPV4_HEADER *ipv4_header;
/* 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 -> nxd_ip_address.v4 = ipv4_header -> nx_ip_header_source_ip;
#ifdef TX_ENABLE_EVENT_TRACE
ip_version = NX_IP_VERSION_V4;
ip_address_word3 = ip_address -> nxd_ip_address.v4;
#endif /* TX_ENABLE_EVENT_TRACE */
}
#endif /* NX_DISABLE_IPV4 */
#ifdef FEATURE_NX_IPV6
if (ip_address -> nxd_ip_version == NX_IP_VERSION_V6)
{
NX_IPV6_HEADER *ipv6_header;
/* Obtain the IPv6 header. */
/*lint -e{927} -e{826} suppress cast of pointer to pointer, since it is necessary */
ipv6_header = (NX_IPV6_HEADER *)packet_ptr -> nx_packet_ip_header;
COPY_IPV6_ADDRESS(ipv6_header -> nx_ip_header_source_ip,
ip_address -> nxd_ip_address.v6);
#ifdef TX_ENABLE_EVENT_TRACE
ip_version = NX_IP_VERSION_V6;
ip_address_word3 = ip_address -> nxd_ip_address.v6[3];
#endif /* TX_ENABLE_EVENT_TRACE */
}
#endif /* FEATURE_NX_IPV6 */
#ifdef TX_ENABLE_EVENT_TRACE
/* If trace is enabled, insert this event into the trace buffer. */
NX_TRACE_IN_LINE_INSERT(NXD_TRACE_UDP_SOURCE_EXTRACT, packet_ptr, ip_version, ip_address_word3, *port, NX_TRACE_UDP_EVENTS, 0, 0);
#endif /* TX_ENABLE_EVENT_TRACE */
return(NX_SUCCESS);
}
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