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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 "tx_thread.h"
#include "nx_udp.h"
#include "nx_packet.h"
#include "nx_ip.h"
#ifdef FEATURE_NX_IPV6
#include "nx_ipv6.h"
#endif /* FEATURE_NX_IPV6 */
#ifdef NX_ENABLE_TCPIP_OFFLOAD
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _nx_udp_socket_driver_packet_receive PORTABLE C */
/* 6.4.3 */
/* AUTHOR */
/* */
/* Yuxin Zhou, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function receives a UDP packet from the TCP/IP driver and add */
/* fake TCP/IP header. Then pass the packet to IP deferred receive */
/* routine. */
/* */
/* INPUT */
/* */
/* socket_ptr Pointer to owning socket */
/* packet_ptr Pointer to packet to process */
/* local_ip Pointer to local IP address */
/* remote_ip Pointer to remote IP address */
/* remote_port Pointer to remote UDP port */
/* */
/* OUTPUT */
/* */
/* None */
/* */
/* CALLS */
/* */
/* tx_mutex_get Obtain protection mutex */
/* tx_mutex_put Release protection mutex */
/* _nx_ip_packet_deferred_receive Defer IP packet receive */
/* */
/* CALLED BY */
/* */
/* Driver */
/* */
/**************************************************************************/
VOID _nx_udp_socket_driver_packet_receive(NX_UDP_SOCKET *socket_ptr, NX_PACKET *packet_ptr,
NXD_ADDRESS *local_ip, NXD_ADDRESS *remote_ip, UINT remote_port)
{
NX_IP *ip_ptr;
NX_UDP_HEADER *udp_header_ptr;
/* Setup the IP pointer. */
ip_ptr = socket_ptr -> nx_udp_socket_ip_ptr;
if (packet_ptr == NX_NULL)
{
/* Socket error. Just ignore. */
return;
}
/* Fake UDP and IP header. */
/* Prepend the UDP header to the packet. First, make room for the UDP header. */
packet_ptr -> nx_packet_prepend_ptr = packet_ptr -> nx_packet_prepend_ptr - sizeof(NX_UDP_HEADER);
/* Increase the packet length. */
packet_ptr -> nx_packet_length = packet_ptr -> nx_packet_length + (ULONG)sizeof(NX_UDP_HEADER);
/* Setup the UDP header pointer. */
/*lint -e{927} -e{826} suppress cast of pointer to pointer, since it is necessary */
udp_header_ptr = (NX_UDP_HEADER *)packet_ptr -> nx_packet_prepend_ptr;
/* Build the first 32-bit word of the UDP header. */
udp_header_ptr -> nx_udp_header_word_0 =
((ULONG)remote_port << NX_SHIFT_BY_16) | (ULONG)socket_ptr -> nx_udp_socket_port;
/* Build the second 32-bit word of the UDP header. */
udp_header_ptr -> nx_udp_header_word_1 = (packet_ptr -> nx_packet_length << NX_SHIFT_BY_16);
/* Endian swapping logic. If NX_LITTLE_ENDIAN is specified, these macros will
swap the endian of the UDP header. */
NX_CHANGE_ULONG_ENDIAN(udp_header_ptr -> nx_udp_header_word_0);
NX_CHANGE_ULONG_ENDIAN(udp_header_ptr -> nx_udp_header_word_1);
#ifndef NX_DISABLE_IPV4
if (remote_ip -> nxd_ip_version == NX_IP_VERSION_V4)
{
_nx_ip_header_add(ip_ptr, packet_ptr, remote_ip -> nxd_ip_address.v4,
local_ip -> nxd_ip_address.v4,
socket_ptr -> nx_udp_socket_type_of_service,
socket_ptr -> nx_udp_socket_time_to_live,
NX_IP_UDP,
socket_ptr -> nx_udp_socket_fragment_enable);
}
#endif /* !NX_DISABLE_IPV4 */
#ifdef FEATURE_NX_IPV6
if (remote_ip -> nxd_ip_version == NX_IP_VERSION_V6)
{
if (_nx_ipv6_header_add(ip_ptr, &packet_ptr,
NX_PROTOCOL_UDP,
packet_ptr -> nx_packet_length,
ip_ptr -> nx_ipv6_hop_limit,
remote_ip -> nxd_ip_address.v6,
local_ip -> nxd_ip_address.v6,
NX_NULL))
{
/* Release the IP internal mutex. */
tx_mutex_put(&(ip_ptr -> nx_ip_protection));
return;
}
}
#endif /* FEATURE_NX_IPV6 */
_nx_ip_packet_deferred_receive(ip_ptr, packet_ptr);
}
#endif /* NX_ENABLE_TCPIP_OFFLOAD */
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