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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_ipv4.h"
#ifdef FEATURE_NX_IPV6
#include "nx_ipv6.h"
#endif
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _nxd_udp_packet_info_extract PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* Yuxin Zhou, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function extracts the source IP address, protocol, (the */
/* protocol is always UDP), port number and the incoming interface */
/* from the incoming packet. */
/* */
/* INPUT */
/* */
/* packet_ptr Pointer to UDP packet */
/* ip_address Pointer to sender IP address */
/* protocol Pointer to packet protocol. */
/* Always 17 (UDP) */
/* port Pointer to sender source port */
/* interface_index Pointer to interface index */
/* packet received on */
/* */
/* OUTPUT */
/* */
/* status 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_packet_info_extract(NX_PACKET *packet_ptr, NXD_ADDRESS *ip_address,
UINT *protocol, UINT *port, UINT *interface_index)
{
ULONG *temp_ptr;
UINT source_port;
NX_INTERFACE *nx_interface;
#ifndef NX_DISABLE_IPV4
NX_IPV4_HEADER *ipv4_header;
#endif /* !NX_DISABLE_IPV4 */
#ifdef TX_ENABLE_EVENT_TRACE
ULONG address = 0;
#endif /* TX_ENABLE_EVENT_TRACE */
#ifdef FEATURE_NX_IPV6
NX_IPV6_HEADER *ipv6_header;
#endif /* FEATURE_NX_IPV6 */
if (ip_address)
{
#ifndef NX_DISABLE_IPV4
if (packet_ptr -> nx_packet_ip_version == NX_IP_VERSION_V4)
{
/*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;
ip_address -> nxd_ip_version = NX_IP_VERSION_V4;
/* At this point, the IP address in the IPv4 header is in host byte order. */
ip_address -> nxd_ip_address.v4 = ipv4_header -> nx_ip_header_source_ip;
#ifdef TX_ENABLE_EVENT_TRACE
address = ip_address -> nxd_ip_address.v4;
#endif /* TX_ENABLE_EVENT_TRACE */
}
else
#endif /* !NX_DISABLE_IPV4 */
#ifdef FEATURE_NX_IPV6
if (packet_ptr -> nx_packet_ip_version == NX_IP_VERSION_V6)
{
/*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;
ip_address -> nxd_ip_version = NX_IP_VERSION_V6;
/* At this point, the IP address in the IPv6 header is in host byte order. */
COPY_IPV6_ADDRESS(ipv6_header -> nx_ip_header_source_ip, ip_address -> nxd_ip_address.v6);
#ifdef TX_ENABLE_EVENT_TRACE
address = ip_address -> nxd_ip_address.v6[3];
#endif /* TX_ENABLE_EVENT_TRACE*/
}
else
#endif /* FEATURE_NX_IPV6 */
{
/* Invalid IP version . */
return(NX_INVALID_PACKET);
}
}
/* 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. */
source_port = (UINT)(*(temp_ptr - 2) >> NX_SHIFT_BY_16);
if (port != NX_NULL)
{
*port = source_port;
}
if (protocol != NX_NULL)
{
*protocol = 0x11;
}
/* If trace is enabled, insert this event into the trace buffer. */
NX_TRACE_IN_LINE_INSERT(NX_TRACE_UDP_SOURCE_EXTRACT, packet_ptr, address, source_port, 0, NX_TRACE_PACKET_EVENTS, 0, 0);
if (interface_index == NX_NULL)
{
return(NX_SUCCESS);
}
/* Search for interface index number. Initialize interface value as
invalid (0xFFFFFFFF). Once we find valid interface, we will update
the returned value. */
*interface_index = 0xFFFFFFFF;
if (packet_ptr -> nx_packet_ip_version == NX_IP_VERSION_V4)
{
nx_interface = packet_ptr -> nx_packet_address.nx_packet_interface_ptr;
}
#ifdef FEATURE_NX_IPV6
else if (packet_ptr -> nx_packet_ip_version == NX_IP_VERSION_V6)
{
if (packet_ptr -> nx_packet_address.nx_packet_ipv6_address_ptr == NX_NULL)
{
/* No interface attached. Done here, and return success. */
return(NX_SUCCESS);
}
else
{
nx_interface = packet_ptr -> nx_packet_address.nx_packet_ipv6_address_ptr -> nxd_ipv6_address_attached;
}
}
#endif /* FEATURE_NX_IPV6 */
else
{
return(NX_SUCCESS);
}
if (nx_interface == NX_NULL)
{
/* No interface attached. Done here, and return success. */
return(NX_SUCCESS);
}
*interface_index = (UINT)nx_interface -> nx_interface_index;
return(NX_SUCCESS);
}