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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 */
/** */
/** Transmission Control Protocol (TCP) */
/** */
/**************************************************************************/
/**************************************************************************/
#define NX_SOURCE_CODE
/* Include necessary system files. */
#include "nx_api.h"
#include "nx_ip.h"
#include "nx_tcp.h"
#include "nx_packet.h"
#ifdef FEATURE_NX_IPV6
#include "nx_ipv6.h"
#endif /* FEATURE_NX_IPV6 */
/* Bring in externs for caller checking code. */
NX_CALLER_CHECKING_EXTERNS
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _nxe_tcp_socket_send PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* Yuxin Zhou, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function checks for errors in the TCP socket send */
/* function call. */
/* */
/* INPUT */
/* */
/* socket_ptr Pointer to socket */
/* packet_ptr Pointer to packet to send */
/* wait_option Suspension option */
/* */
/* OUTPUT */
/* */
/* status Completion status */
/* */
/* CALLS */
/* */
/* _nx_tcp_socket_send Actual TCP socket send */
/* function */
/* */
/* CALLED BY */
/* */
/* Application */
/* */
/* 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 _nxe_tcp_socket_send(NX_TCP_SOCKET *socket_ptr, NX_PACKET **packet_ptr_ptr, ULONG wait_option)
{
NX_PACKET *packet_ptr;
UINT status;
UINT ip_header_size;
/* Setup packet pointer. */
packet_ptr = *packet_ptr_ptr;
/* Check for invalid input pointers. */
if ((socket_ptr == NX_NULL) || (socket_ptr -> nx_tcp_socket_id != NX_TCP_ID))
{
return(NX_PTR_ERROR);
}
/* Check for an invalid packet pointer. */
/*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_INVALID_PACKET);
}
/* Check to see if TCP is enabled. */
if (!(socket_ptr -> nx_tcp_socket_ip_ptr) -> nx_ip_tcp_packet_receive)
{
return(NX_NOT_ENABLED);
}
/* Check for an invalid packet prepend pointer. */
#ifndef NX_DISABLE_IPV4
if (socket_ptr -> nx_tcp_socket_connect_ip.nxd_ip_version == NX_IP_VERSION_V4)
{
ip_header_size = (UINT)sizeof(NX_IPV4_HEADER);
}
else
#endif /* !NX_DISABLE_IPV4 */
#ifdef FEATURE_NX_IPV6
if (socket_ptr -> nx_tcp_socket_connect_ip.nxd_ip_version == NX_IP_VERSION_V6)
{
ip_header_size = (UINT)sizeof(NX_IPV6_HEADER);
}
else
#endif /* FEATURE_NX_IPV6 */
{
return(NX_NOT_CONNECTED);
}
/*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_TCP_HEADER)))
{
#ifndef NX_DISABLE_TCP_INFO
/* Increment the TCP invalid packet count. */
(socket_ptr -> nx_tcp_socket_ip_ptr) -> nx_ip_tcp_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_TCP_INFO
/* Increment the TCP invalid packet count. */
(socket_ptr -> nx_tcp_socket_ip_ptr) -> nx_ip_tcp_invalid_packets++;
#endif
/* Return error code. */
return(NX_OVERFLOW);
}
/* Check for appropriate caller. */
NX_THREADS_ONLY_CALLER_CHECKING
/* Call actual TCP socket send function. */
status = _nx_tcp_socket_send(socket_ptr, packet_ptr, wait_option);
/* 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);
}