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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"
#include "nx_packet.h"
#include "nx_ipv6.h"
/* Bring in externs for caller checking code. */
NX_CALLER_CHECKING_EXTERNS
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _nxde_udp_socket_send PORTABLE C */
/* 6.4.3 */
/* AUTHOR */
/* */
/* Yuxin Zhou, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function checks for errors in the UDP socket send */
/* function call. */
/* */
/* INPUT */
/* */
/* socket_ptr Pointer to UDP socket */
/* packet_ptr Pointer to UDP packet */
/* ip_address IP address */
/* port 16-bit UDP port number */
/* */
/* OUTPUT */
/* */
/* status Completion status */
/* NX_PTR_ERROR Invalid pointer input or */
/* invalid packet input */
/* NX_NOT_ENABLED UDP not enabled on IP instance*/
/* NX_IP_ADDRESS_ERROR Invalid IP address input */
/* NX_INVALID_PORT Invalid UDP destination port */
/* NX_UNDERFLOW Check for invalid packet */
/* prepend pointer */
/* NX_OVERFLOW Check for invalid packet */
/* prepend pointer */
/* */
/* CALLS */
/* */
/* _nxd_udp_socket_send Actual UDP socket send */
/* function */
/* */
/* CALLED BY */
/* */
/* Application Code */
/* */
/**************************************************************************/
UINT _nxde_udp_socket_send(NX_UDP_SOCKET *socket_ptr, NX_PACKET **packet_ptr_ptr, NXD_ADDRESS *ip_address, UINT port)
{
NX_PACKET *packet_ptr;
UINT status;
UINT ip_header_size = 0;
/* Setup packet pointer. */
packet_ptr = *packet_ptr_ptr;
/* Check for invalid input pointers. */
if ((socket_ptr == NX_NULL) || (socket_ptr -> nx_udp_socket_id != NX_UDP_ID) || (ip_address == NX_NULL))
{
return(NX_PTR_ERROR);
}
/* Check for invalid packet pointers and packets not marked for allocation. */
/* Cast the ULONG into a packet pointer. Since this is exactly what we wish to do, disable the lint warning with the following comment: */
/*lint -e{923} suppress cast of ULONG to pointer. */
if ((packet_ptr == NX_NULL) ||
(packet_ptr -> nx_packet_union_next.nx_packet_tcp_queue_next != ((NX_PACKET *)NX_PACKET_ALLOCATED)))
{
return(NX_PTR_ERROR);
}
/* Check if UDP is enabled. */
if (!(socket_ptr -> nx_udp_socket_ip_ptr) -> nx_ip_udp_packet_receive)
{
return(NX_NOT_ENABLED);
}
if ((ip_address -> nxd_ip_version != NX_IP_VERSION_V4) &&
(ip_address -> nxd_ip_version != NX_IP_VERSION_V6))
{
return(NX_IP_ADDRESS_ERROR);
}
#ifndef NX_DISABLE_IPV4
if (ip_address -> nxd_ip_version == NX_IP_VERSION_V4)
{
if (ip_address -> nxd_ip_address.v4 == 0)
{
return(NX_IP_ADDRESS_ERROR);
}
ip_header_size = (UINT)sizeof(NX_IPV4_HEADER);
}
#endif /* !NX_DISABLE_IPV4 */
#ifdef FEATURE_NX_IPV6
if (ip_address -> nxd_ip_version == NX_IP_VERSION_V6)
{
/* Check for invalid IP address. */
if (CHECK_UNSPECIFIED_ADDRESS(&ip_address -> nxd_ip_address.v6[0]))
{
return(NX_IP_ADDRESS_ERROR);
}
ip_header_size = (UINT)sizeof(NX_IPV6_HEADER);
}
#endif /* FEATURE_NX_IPV6 */
/* Check for an invalid port. */
if (((ULONG)port) > (ULONG)NX_MAX_PORT)
{
return(NX_INVALID_PORT);
}
/* Check for an invalid packet prepend pointer. */
/*lint -e{946} -e{947} suppress pointer subtraction, since it is necessary. */
if ((INT)(packet_ptr -> nx_packet_prepend_ptr - packet_ptr -> nx_packet_data_start) < (INT)(ip_header_size + sizeof(NX_UDP_HEADER)))
{
#ifndef NX_DISABLE_UDP_INFO
/* Increment the total UDP invalid packet count. */
(socket_ptr -> nx_udp_socket_ip_ptr) -> nx_ip_udp_invalid_packets++;
/* Increment the total UDP invalid packet count for this socket. */
socket_ptr -> nx_udp_socket_invalid_packets++;
#endif
/* Return error code. */
return(NX_UNDERFLOW);
}
/* Check for an invalid packet append pointer. */
/*lint -e{946} suppress pointer subtraction, since it is necessary. */
if (packet_ptr -> nx_packet_append_ptr > packet_ptr -> nx_packet_data_end)
{
#ifndef NX_DISABLE_UDP_INFO
/* Increment the total UDP invalid packet count. */
(socket_ptr -> nx_udp_socket_ip_ptr) -> nx_ip_udp_invalid_packets++;
/* Increment the total UDP invalid packet count for this socket. */
socket_ptr -> nx_udp_socket_invalid_packets++;
#endif
/* Return error code. */
return(NX_OVERFLOW);
}
/* Check for appropriate caller. */
NX_THREADS_ONLY_CALLER_CHECKING
/* Call actual UDP socket send function. */
status = _nxd_udp_socket_send(socket_ptr, packet_ptr, ip_address, port);
/* Determine if the packet send was successful. */
if (status == NX_SUCCESS)
{
/* Yes, now clear the application's packet pointer so it can't be accidentally
used again by the application. This is only done when error checking is
enabled. */
*packet_ptr_ptr = NX_NULL;
}
/* Return completion status. */
return(status);
}
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