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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"
#ifdef FEATURE_NX_IPV6
#include "nx_ipv6.h"
#endif /* FEATURE_NX_IPV6 */
#include "nx_packet.h"
#include "nx_tcp.h"
#include "tx_thread.h"
#ifdef NX_IPSEC_ENABLE
#include "nx_ipsec.h"
#endif /* NX_IPSEC_ENABLE */
#ifdef NX_ENABLE_TCPIP_OFFLOAD
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _nx_tcp_socket_driver_send PORTABLE C */
/* 6.1.8 */
/* AUTHOR */
/* */
/* Yuxin Zhou, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function sends a TCP packet through TCP/IP offload interface. */
/* */
/* INPUT */
/* */
/* socket_ptr Pointer to socket */
/* packet_ptr Pointer to packet to send */
/* wait_option Suspension option */
/* */
/* OUTPUT */
/* */
/* status Completion status */
/* */
/* CALLS */
/* */
/* _nx_ip_packet_send Packet send function */
/* _nx_ipv6_packet_send Packet send function */
/* */
/* CALLED BY */
/* */
/* _nx_tcp_socket_send_internal */
/* */
/* RELEASE HISTORY */
/* */
/* DATE NAME DESCRIPTION */
/* */
/* 08-02-2021 Yuxin Zhou Initial Version 6.1.8 */
/* */
/**************************************************************************/
static UINT _nx_tcp_socket_driver_send(NX_TCP_SOCKET *socket_ptr, NX_PACKET *packet_ptr, ULONG wait_option)
{
UINT status;
NX_IP *ip_ptr;
NX_INTERFACE *interface_ptr = socket_ptr -> nx_tcp_socket_connect_interface;
#ifdef NX_ENABLE_IP_PACKET_FILTER
UCHAR *original_ptr = packet_ptr -> nx_packet_prepend_ptr;
ULONG original_length = packet_ptr -> nx_packet_length;
NX_TCP_HEADER *header_ptr;
#endif /* NX_ENABLE_IP_PACKET_FILTER */
/* Setup the pointer to the associated IP instance. */
ip_ptr = socket_ptr -> nx_tcp_socket_ip_ptr;
#ifdef NX_ENABLE_IP_PACKET_FILTER
/* Check if the IP packet filter is set. */
if (ip_ptr -> nx_ip_packet_filter || ip_ptr -> nx_ip_packet_filter_extended)
{
/* Yes, add the TCP and IP Header to trigger filtering. */
/* Prepend the TCP header to the packet. First, make room for the TCP header. */
packet_ptr -> nx_packet_prepend_ptr = packet_ptr -> nx_packet_prepend_ptr - sizeof(NX_TCP_HEADER);
/* Add the length of the TCP header. */
packet_ptr -> nx_packet_length = packet_ptr -> nx_packet_length + (ULONG)sizeof(NX_TCP_HEADER);
/* Pickup the pointer to the head of the TCP packet. */
/*lint -e{927} -e{826} suppress cast of pointer to pointer, since it is necessary */
header_ptr = (NX_TCP_HEADER *)packet_ptr -> nx_packet_prepend_ptr;
/* Build the output request in the TCP header. */
header_ptr -> nx_tcp_header_word_0 = (((ULONG)(socket_ptr -> nx_tcp_socket_port)) << NX_SHIFT_BY_16) |
(ULONG)socket_ptr -> nx_tcp_socket_connect_port;
header_ptr -> nx_tcp_acknowledgment_number = 0;
header_ptr -> nx_tcp_sequence_number = 0;
header_ptr -> nx_tcp_header_word_3 = NX_TCP_HEADER_SIZE | NX_TCP_ACK_BIT | NX_TCP_PSH_BIT;
header_ptr -> nx_tcp_header_word_4 = 0;
/* Endian swapping logic. If NX_LITTLE_ENDIAN is specified, these macros will
swap the endian of the TCP header. */
NX_CHANGE_ULONG_ENDIAN(header_ptr -> nx_tcp_header_word_0);
NX_CHANGE_ULONG_ENDIAN(header_ptr -> nx_tcp_header_word_3);
#ifndef NX_DISABLE_IPV4
if (socket_ptr -> nx_tcp_socket_connect_ip.nxd_ip_version == NX_IP_VERSION_V4)
{
_nx_ip_header_add(ip_ptr, packet_ptr,
socket_ptr -> nx_tcp_socket_connect_interface -> nx_interface_ip_address,
socket_ptr -> nx_tcp_socket_connect_ip.nxd_ip_address.v4,
socket_ptr -> nx_tcp_socket_type_of_service,
socket_ptr -> nx_tcp_socket_time_to_live,
NX_IP_TCP,
socket_ptr -> nx_tcp_socket_fragment_enable);
}
#endif /* !NX_DISABLE_IPV4 */
#ifdef FEATURE_NX_IPV6
if (socket_ptr -> nx_tcp_socket_connect_ip.nxd_ip_version == NX_IP_VERSION_V6)
{
if (_nx_ipv6_header_add(ip_ptr, &packet_ptr,
NX_PROTOCOL_TCP,
packet_ptr -> nx_packet_length,
ip_ptr -> nx_ipv6_hop_limit,
socket_ptr -> nx_tcp_socket_ipv6_addr -> nxd_ipv6_address,
socket_ptr -> nx_tcp_socket_connect_ip.nxd_ip_address.v6,
NX_NULL))
{
/* Invalid interface address. Just return success. */
return(NX_SUCCESS);
}
}
#endif /* FEATURE_NX_IPV6 */
if (ip_ptr -> nx_ip_packet_filter)
{
if (ip_ptr -> nx_ip_packet_filter((VOID *)(packet_ptr -> nx_packet_prepend_ptr),
NX_IP_PACKET_OUT) != NX_SUCCESS)
{
/* Packet consumed by IP filter. Just return success. */
_nx_packet_transmit_release(packet_ptr);
return(NX_SUCCESS);
}
}
/* Check if the IP packet filter extended is set. */
if (ip_ptr -> nx_ip_packet_filter_extended)
{
/* Yes, call the IP packet filter extended routine. */
if (ip_ptr -> nx_ip_packet_filter_extended(ip_ptr, packet_ptr, NX_IP_PACKET_OUT) != NX_SUCCESS)
{
/* Packet consumed by IP filter. Just return success. */
_nx_packet_transmit_release(packet_ptr);
return(NX_SUCCESS);
}
}
/* Reset UDP and IP header. */
packet_ptr -> nx_packet_prepend_ptr = original_ptr;
packet_ptr -> nx_packet_length = original_length;
}
#endif /* NX_ENABLE_IP_PACKET_FILTER */
/* Let TCP/IP offload interface send the packet. */
status = interface_ptr -> nx_interface_tcpip_offload_handler(ip_ptr, interface_ptr, socket_ptr,
NX_TCPIP_OFFLOAD_TCP_SOCKET_SEND,
packet_ptr, NX_NULL, NX_NULL, 0, NX_NULL,
wait_option);
if (status)
{
return(NX_TCPIP_OFFLOAD_ERROR);
}
else
{
return(NX_SUCCESS);
}
}
#endif /* NX_ENABLE_TCPIP_OFFLOAD */
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _nx_tcp_socket_send_internal PORTABLE C */
/* 6.1.10 */
/* AUTHOR */
/* */
/* Yuxin Zhou, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function sends a TCP packet through the specified socket. */
/* */
/* INPUT */
/* */
/* socket_ptr Pointer to socket */
/* packet_ptr Pointer to packet to send */
/* wait_option Suspension option */
/* */
/* OUTPUT */
/* */
/* status Completion status */
/* */
/* CALLS */
/* */
/* _nx_ip_packet_send Packet send function */
/* _nx_ipv6_packet_send Packet send function */
/* _nx_ip_checksum_compute Calculate TCP checksum */
/* _nx_tcp_socket_thread_suspend Suspend calling thread */
/* tx_mutex_get Get protection mutex */
/* tx_mutex_put Put protection mutex */
/* _nx_tcp_socket_driver_send TCP/IP offload send function */
/* */
/* CALLED BY */
/* */
/* _nx_tcp_socket_send */
/* */
/* NOTE: */
/* */
/* This is an internal function, only being called by */
/* _nx_tcp_socket_send(). The caller guarantees that the payload */
/* size does not exceed MSS. */
/* */
/* 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 */
/* 08-02-2021 Yuxin Zhou Modified comment(s), and */
/* supported TCP/IP offload, */
/* resulting in version 6.1.8 */
/* 10-15-2021 Yuxin Zhou Modified comment(s), and */
/* fixed the bug of race */
/* condition, */
/* resulting in version 6.1.9 */
/* 01-31-2022 Yuxin Zhou Modified comment(s), and */
/* improved the throughput of */
/* TCP transmission, */
/* resulting in version 6.1.10 */
/* */
/**************************************************************************/
UINT _nx_tcp_socket_send_internal(NX_TCP_SOCKET *socket_ptr, NX_PACKET *packet_ptr, ULONG wait_option)
{
TX_INTERRUPT_SAVE_AREA
NX_IP *ip_ptr;
NX_PACKET_POOL *pool_ptr;
NX_TCP_HEADER *header_ptr;
ULONG checksum = 0;
ULONG sequence_number;
ULONG tx_window_current;
ULONG remaining_bytes;
ULONG *source_ip = NX_NULL, *dest_ip = NX_NULL;
ULONG send_mss;
NX_PACKET *send_packet = packet_ptr;
NX_PACKET *current_packet;
UCHAR *current_ptr;
ULONG data_offset = 0;
ULONG source_data_size;
ULONG copy_size;
UINT data_left;
UINT ret;
UCHAR preempted = NX_FALSE;
UCHAR adjust_packet;
UINT old_threshold = 0;
ULONG window_size;
#ifdef NX_ENABLE_TCPIP_OFFLOAD
UINT status;
NX_INTERFACE *interface_ptr;
#endif /* NX_ENABLE_TCPIP_OFFLOAD */
#if defined(NX_DISABLE_TCP_TX_CHECKSUM) || defined(NX_ENABLE_INTERFACE_CAPABILITY) || defined(NX_IPSEC_ENABLE)
UINT compute_checksum = 1;
#endif /* defined(NX_DISABLE_TCP_TX_CHECKSUM) || defined(NX_ENABLE_INTERFACE_CAPABILITY) || defined(NX_IPSEC_ENABLE) */
#ifdef NX_DISABLE_TCP_TX_CHECKSUM
compute_checksum = 0;
#endif /* NX_DISABLE_TCP_TX_CHECKSUM */
/* Check packet length. */
if (packet_ptr -> nx_packet_length == 0)
{
/* Empty packet is not allowed. */
return(NX_INVALID_PACKET);
}
/* Lockout interrupts. */
TX_DISABLE
/* Determine if the socket is currently bound. */
if (!socket_ptr -> nx_tcp_socket_bound_next)
{
/* Restore interrupts. */
TX_RESTORE
/* Socket is not bound, return an error message. */
return(NX_NOT_BOUND);
}
/* Pickup the important information from the socket. */
/* Setup the pointer to the associated IP instance. */
ip_ptr = socket_ptr -> nx_tcp_socket_ip_ptr;
/* Restore interrupts. */
TX_RESTORE
/* Check if the connection is in progress. */
if ((socket_ptr -> nx_tcp_socket_state == NX_TCP_SYN_SENT) || (socket_ptr -> nx_tcp_socket_state == NX_TCP_SYN_RECEIVED))
{
/* Yes it it. Wait for establish state. */
_nx_tcp_socket_state_wait(socket_ptr, NX_TCP_ESTABLISHED, wait_option);
}
/* Obtain the IP mutex. */
tx_mutex_get(&(ip_ptr -> nx_ip_protection), TX_WAIT_FOREVER);
/* Check for the socket being in an established state. */
if ((socket_ptr -> nx_tcp_socket_state != NX_TCP_ESTABLISHED) && (socket_ptr -> nx_tcp_socket_state != NX_TCP_CLOSE_WAIT))
{
/* Release the protection. */
tx_mutex_put(&(ip_ptr -> nx_ip_protection));
/* Socket is not connected, return an error message. */
return(NX_NOT_CONNECTED);
}
/* Add debug information. */
NX_PACKET_DEBUG(__FILE__, __LINE__, packet_ptr);
#ifndef NX_DISABLE_IPV4
if (socket_ptr -> nx_tcp_socket_connect_ip.nxd_ip_version == NX_IP_VERSION_V4)
{
/* Set the source address. */
source_ip = &socket_ptr -> nx_tcp_socket_connect_interface -> nx_interface_ip_address;
/* Set the destination address. */
dest_ip = &socket_ptr -> nx_tcp_socket_connect_ip.nxd_ip_address.v4;
/* The outgoing interface should have been stored in the socket structure. */
packet_ptr -> nx_packet_address.nx_packet_interface_ptr = socket_ptr -> nx_tcp_socket_connect_interface;
/* Calculate the data offset required by fragmented TCP packet. */
data_offset = NX_PHYSICAL_HEADER + sizeof(NX_IPV4_HEADER) + sizeof(NX_TCP_HEADER);
}
#endif /* !NX_DISABLE_IPV4 */
#ifdef FEATURE_NX_IPV6
if (socket_ptr -> nx_tcp_socket_connect_ip.nxd_ip_version == NX_IP_VERSION_V6)
{
/* Determine whether or not the IPv6 address is valid. */
if (socket_ptr -> nx_tcp_socket_ipv6_addr -> nxd_ipv6_address_state != NX_IPV6_ADDR_STATE_VALID)
{
/* Release the protection. */
tx_mutex_put(&(ip_ptr -> nx_ip_protection));
/* Add debug information. */
NX_PACKET_DEBUG(__FILE__, __LINE__, packet_ptr);
return(NX_NO_INTERFACE_ADDRESS);
}
/* Set the source address. */
source_ip = socket_ptr -> nx_tcp_socket_ipv6_addr -> nxd_ipv6_address;
/* Set the destination address. */
dest_ip = socket_ptr -> nx_tcp_socket_connect_ip.nxd_ip_address.v6;
/* The outgoing address should have been stored in the socket structure. */
packet_ptr -> nx_packet_address.nx_packet_ipv6_address_ptr = socket_ptr -> nx_tcp_socket_ipv6_addr;
/* Calculate the data offset required by fragmented TCP packet. */
data_offset = NX_PHYSICAL_HEADER + sizeof(NX_IPV6_HEADER) + sizeof(NX_TCP_HEADER);
}
#endif /* FEATURE_NX_IPV6 */
#ifdef NX_ENABLE_TCPIP_OFFLOAD
interface_ptr = socket_ptr -> nx_tcp_socket_connect_interface;
if ((interface_ptr -> nx_interface_capability_flag & NX_INTERFACE_CAPABILITY_TCPIP_OFFLOAD) &&
(interface_ptr -> nx_interface_tcpip_offload_handler))
{
/* This interface supports TCP/IP offload. */
status = _nx_tcp_socket_driver_send(socket_ptr, packet_ptr, wait_option);
/* Release the IP protection. */
tx_mutex_put(&(ip_ptr -> nx_ip_protection));
return(status);
}
#endif /* NX_ENABLE_TCPIP_OFFLOAD */
#ifdef NX_IPSEC_ENABLE
/* Increase the data offset when IPsec is enabled. */
data_offset += socket_ptr -> nx_tcp_socket_egress_sa_data_offset;
#endif /* NX_IPSEC_ENABLE */
/* If trace is enabled, insert this event into the trace buffer. */
NX_TRACE_IN_LINE_INSERT(NX_TRACE_TCP_SOCKET_SEND, socket_ptr, packet_ptr, packet_ptr -> nx_packet_length, socket_ptr -> nx_tcp_socket_tx_sequence, NX_TRACE_TCP_EVENTS, 0, 0);
/* Get the max mss this socket could send */
send_mss = socket_ptr -> nx_tcp_socket_connect_mss;
/* Get original pool. */
pool_ptr = packet_ptr -> nx_packet_pool_owner;
/* Loop to send the packet. */
for (;;)
{
/* Pick up the min(cwnd, swnd) */
if (socket_ptr -> nx_tcp_socket_tx_window_advertised > socket_ptr -> nx_tcp_socket_tx_window_congestion)
{
tx_window_current = socket_ptr -> nx_tcp_socket_tx_window_congestion;
/* On the first and second duplicate ACKs received, the total FlightSize would
remain less than or equal to cwnd plus 2*SMSS.
Section 3.2, Page 9, RFC5681. */
if ((socket_ptr -> nx_tcp_socket_duplicated_ack_received == 1) ||
(socket_ptr -> nx_tcp_socket_duplicated_ack_received == 2))
{
tx_window_current += (socket_ptr -> nx_tcp_socket_connect_mss << 1);
/* Make sure the tx_window_current is less or equal to swnd. */
if (tx_window_current > socket_ptr -> nx_tcp_socket_tx_window_advertised)
{
tx_window_current = socket_ptr -> nx_tcp_socket_tx_window_advertised;
}
}
}
else
{
tx_window_current = socket_ptr -> nx_tcp_socket_tx_window_advertised;
}
/* Substract any data transmitted but unacked (outstanding bytes) */
if (tx_window_current > socket_ptr -> nx_tcp_socket_tx_outstanding_bytes)
{
tx_window_current -= socket_ptr -> nx_tcp_socket_tx_outstanding_bytes;
}
else /* Set tx_window_current to zero. */
{
tx_window_current = 0;
}
/* Pick up the min(tx_window, send_mss). */
if (tx_window_current > send_mss)
{
tx_window_current = send_mss;
}
/* Store the data that is left. */
data_left = packet_ptr -> nx_packet_length;
/* Check whether data can be sent. */
if ((tx_window_current != 0) && (socket_ptr -> nx_tcp_socket_transmit_sent_count < socket_ptr -> nx_tcp_socket_transmit_queue_maximum))
{
/* Whether to adjust the packet? */
if (packet_ptr -> nx_packet_length > tx_window_current)
{
/* Packet need to be fragmented. */
adjust_packet = NX_TRUE;
}
/*lint -e(923) suppress cast of pointer to ULONG. */
else if (((ALIGN_TYPE)packet_ptr -> nx_packet_prepend_ptr) & 3)
{
/* Starting address of TCP header need to be four bytes aligned. */
adjust_packet = NX_TRUE;
}
#ifndef NX_DISABLE_PACKET_CHAIN
else if ((packet_ptr -> nx_packet_next != NX_NULL) &&
((packet_ptr -> nx_packet_length + data_offset) < pool_ptr -> nx_packet_pool_payload_size) &&
(pool_ptr -> nx_packet_pool_available > 0))
{
/* All data can be sent in one packet but they are in chained packets. */
adjust_packet = NX_TRUE;
}
else if (packet_ptr -> nx_packet_prepend_ptr == packet_ptr -> nx_packet_append_ptr)
{
/* Loop to find the first byte of data. */
current_packet = packet_ptr -> nx_packet_next;
while ((current_packet != NX_NULL) && (current_packet -> nx_packet_prepend_ptr == current_packet -> nx_packet_append_ptr))
{
/* Move to next packet. */
current_packet = current_packet -> nx_packet_next;
}
/* packet length is not 0. Therefore the packet chain is expected to contain data. */
NX_ASSERT(current_packet != NX_NULL);
/*lint -e{923} suppress cast of pointer to ULONG. */
if (((ALIGN_TYPE)current_packet -> nx_packet_prepend_ptr) & 3)
{
/* Starting address of TCP data need to be four bytes aligned. */
adjust_packet = NX_TRUE;
}
else
{
/* Packet can be sent directly. */
adjust_packet = NX_FALSE;
}
}
#endif /* NX_DISABLE_PACKET_CHAIN */
else
{
/* Packet can be sent directly. */
adjust_packet = NX_FALSE;
}
/* Adjust the packet? */
if (adjust_packet)
{
/* Yes. Obtain the size of the packet can be sent. */
if (packet_ptr -> nx_packet_length > tx_window_current)
{
remaining_bytes = tx_window_current;
}
else
{
remaining_bytes = packet_ptr -> nx_packet_length;
}
/* Points to the source packet. */
current_packet = packet_ptr;
/* Mark the beginning of data. */
current_ptr = packet_ptr -> nx_packet_prepend_ptr;
/* Release the protection. */
tx_mutex_put(&(ip_ptr -> nx_ip_protection));
/* Obtain a new segmentation. */
ret = _nx_packet_allocate(pool_ptr, &send_packet,
data_offset, wait_option);
if (ret != NX_SUCCESS)
{
/* Restore preemption? */
if (preempted == NX_TRUE)
{
/*lint -e{644} -e{530} suppress variable might not be initialized, since "old_threshold" was initialized when preempted was set to NX_TRUE. */
tx_thread_preemption_change(_tx_thread_current_ptr, old_threshold, &old_threshold);
}
/* Packet allocate failure. Return.*/
return(ret);
}
/* Regain exclusive access to IP instance. */
tx_mutex_get(&(ip_ptr -> nx_ip_protection), TX_WAIT_FOREVER);
/* Add debug information. */
NX_PACKET_DEBUG(__FILE__, __LINE__, send_packet);
/* Loop through the entire source packet. */
while (remaining_bytes)
{
/* Figure out whether or not the source packet still contains data. */
/*lint -e{946} -e{947} suppress pointer subtraction, since it is necessary. */
source_data_size = (ULONG)(current_packet -> nx_packet_append_ptr - current_ptr);
while (source_data_size == 0)
{
#ifndef NX_DISABLE_PACKET_CHAIN
/* The current buffer is exhausted. Move to the next buffer on the source packet chain. */
current_packet = current_packet -> nx_packet_next;
if (current_packet == NX_NULL)
{
#endif /* NX_DISABLE_PACKET_CHAIN */
/* Restore preemption? */
if (preempted == NX_TRUE)
{
tx_thread_preemption_change(_tx_thread_current_ptr, old_threshold, &old_threshold);
}
/* No more data in the source packet. However there are still bytes remaining even though
the packet is not done yet. This is an unrecoverable error. */
/*lint -e{644} suppress variable might not be initialized, since "send_packet" was initialized in _nx_packet_allocate. */
_nx_packet_release(send_packet);
/* Release the protection. */
tx_mutex_put(&(ip_ptr -> nx_ip_protection));
/* Add debug information. */
NX_PACKET_DEBUG(__FILE__, __LINE__, packet_ptr);
return(NX_INVALID_PACKET);
#ifndef NX_DISABLE_PACKET_CHAIN
}
/* Mark the beginning of data in the next packet. */
current_ptr = current_packet -> nx_packet_prepend_ptr;
/* Compute the amount of data present in this source buffer. */
/*lint -e{946} -e{947} suppress pointer subtraction, since it is necessary. */
source_data_size = (ULONG)(current_packet -> nx_packet_append_ptr - current_ptr);
#endif /* NX_DISABLE_PACKET_CHAIN */
}
/* copy_size = min(send_packet, source) */
if (remaining_bytes > source_data_size)
{
copy_size = source_data_size;
}
else
{
copy_size = remaining_bytes;
}
/* Release the mutex before a blocking call. */
tx_mutex_put(&(ip_ptr -> nx_ip_protection));
/* Append data. */
ret = _nx_packet_data_append(send_packet, current_ptr, copy_size,
pool_ptr, wait_option);
/* Regain exclusive access to IP instance. */
tx_mutex_get(&(ip_ptr -> nx_ip_protection), TX_WAIT_FOREVER);
/* Check for errors with data append. */
if (ret != NX_SUCCESS)
{
/* Append failed. */
if (send_packet -> nx_packet_length == 0)
{
/* The packet is empty, return. */
/* Restore preemption? */
if (preempted == NX_TRUE)
{
/*lint -e{644} -e{530} suppress variable might not be initialized, since "old_threshold" was initialized when preempted was set to NX_TRUE. */
tx_thread_preemption_change(_tx_thread_current_ptr, old_threshold, &old_threshold);
}
/* Release the protection. */
tx_mutex_put(&(ip_ptr -> nx_ip_protection));
/* Release the packet. */
_nx_packet_release(send_packet);
/* Packet allocate failure. Return.*/
return(ret);
}
/* Partial data can be sent. Just break. */
break;
}
/* Reduce the remaining_bytes counter by the amount being copied over. */
remaining_bytes -= copy_size;
/* Advance the prepend ptr on the source buffer, by the amount being copied. */
current_ptr += copy_size;
}
send_packet -> nx_packet_address = packet_ptr -> nx_packet_address;
}
else
{
/* Send the packet directly. */
send_packet = packet_ptr;
}
/* Now the send_packet can be sent. */
/* Set IP version. */
send_packet -> nx_packet_ip_version = (UCHAR)(socket_ptr -> nx_tcp_socket_connect_ip.nxd_ip_version);
#ifdef NX_IPSEC_ENABLE
send_packet -> nx_packet_ipsec_sa_ptr = socket_ptr -> nx_tcp_socket_egress_sa;
#endif /* NX_IPSEC_ENABLE */
/* Prepend the TCP header to the packet. First, make room for the TCP header. */
send_packet -> nx_packet_prepend_ptr = send_packet -> nx_packet_prepend_ptr - sizeof(NX_TCP_HEADER);
/* Add the length of the TCP header. */
send_packet -> nx_packet_length = send_packet -> nx_packet_length + (ULONG)sizeof(NX_TCP_HEADER);
/* Pickup the pointer to the head of the TCP packet. */
/*lint -e{927} -e{826} suppress cast of pointer to pointer, since it is necessary */
header_ptr = (NX_TCP_HEADER *)send_packet -> nx_packet_prepend_ptr;
/* Build the output request in the TCP header. */
header_ptr -> nx_tcp_header_word_0 = (((ULONG)(socket_ptr -> nx_tcp_socket_port)) << NX_SHIFT_BY_16) | (ULONG)socket_ptr -> nx_tcp_socket_connect_port;
header_ptr -> nx_tcp_acknowledgment_number = socket_ptr -> nx_tcp_socket_rx_sequence;
/* Set window size. */
#ifdef NX_ENABLE_TCP_WINDOW_SCALING
window_size = socket_ptr -> nx_tcp_socket_rx_window_current >> socket_ptr -> nx_tcp_rcv_win_scale_value;
/* Make sure the window_size is less than 0xFFFF. */
if (window_size > 0xFFFF)
{
window_size = 0xFFFF;
}
#else
window_size = socket_ptr -> nx_tcp_socket_rx_window_current;
#endif /* NX_ENABLE_TCP_WINDOW_SCALING */
header_ptr -> nx_tcp_header_word_3 = NX_TCP_HEADER_SIZE | NX_TCP_ACK_BIT | NX_TCP_PSH_BIT | window_size;
header_ptr -> nx_tcp_header_word_4 = 0;
/* Remember the last ACKed sequence and the last reported window size. */
socket_ptr -> nx_tcp_socket_rx_sequence_acked = socket_ptr -> nx_tcp_socket_rx_sequence;
socket_ptr -> nx_tcp_socket_rx_window_last_sent = socket_ptr -> nx_tcp_socket_rx_window_current;
/* Setup a new delayed ACK timeout. */
socket_ptr -> nx_tcp_socket_delayed_ack_timeout = _nx_tcp_ack_timer_rate;
/* Endian swapping logic. If NX_LITTLE_ENDIAN is specified, these macros will
swap the endian of the TCP header. */
NX_CHANGE_ULONG_ENDIAN(header_ptr -> nx_tcp_header_word_0);
NX_CHANGE_ULONG_ENDIAN(header_ptr -> nx_tcp_acknowledgment_number);
NX_CHANGE_ULONG_ENDIAN(header_ptr -> nx_tcp_header_word_3);
NX_CHANGE_ULONG_ENDIAN(header_ptr -> nx_tcp_header_word_4);
/* Release the protection. */
tx_mutex_put(&(ip_ptr -> nx_ip_protection));
/* Pickup the current transmit sequence number. */
header_ptr -> nx_tcp_sequence_number = socket_ptr -> nx_tcp_socket_tx_sequence;
sequence_number = header_ptr -> nx_tcp_sequence_number;
/* Swap the headers for endianness. */
NX_CHANGE_ULONG_ENDIAN(header_ptr -> nx_tcp_sequence_number);
#ifdef NX_ENABLE_INTERFACE_CAPABILITY
if (socket_ptr -> nx_tcp_socket_connect_interface -> nx_interface_capability_flag & NX_INTERFACE_CAPABILITY_TCP_TX_CHECKSUM)
{
compute_checksum = 0;
}
#endif /* NX_ENABLE_INTERFACE_CAPABILITY */
#ifdef NX_IPSEC_ENABLE
if ((send_packet -> nx_packet_ipsec_sa_ptr != NX_NULL) && (((NX_IPSEC_SA *)(send_packet -> nx_packet_ipsec_sa_ptr)) -> nx_ipsec_sa_encryption_method != NX_CRYPTO_NONE))
{
compute_checksum = 1;
}
#endif /* NX_IPSEC_ENABLE */
#if defined(NX_DISABLE_TCP_TX_CHECKSUM) || defined(NX_ENABLE_INTERFACE_CAPABILITY) || defined(NX_IPSEC_ENABLE)
if (compute_checksum)
#endif /* defined(NX_DISABLE_TCP_TX_CHECKSUM) || defined(NX_ENABLE_INTERFACE_CAPABILITY) || defined(NX_IPSEC_ENABLE) */
{
/* Calculate the TCP checksum without protection. */
checksum = _nx_ip_checksum_compute(send_packet, NX_PROTOCOL_TCP,
(UINT)send_packet -> nx_packet_length,
source_ip, dest_ip);
checksum = ~checksum & NX_LOWER_16_MASK;
}
#ifdef NX_ENABLE_INTERFACE_CAPABILITY
else
{
send_packet -> nx_packet_interface_capability_flag |= NX_INTERFACE_CAPABILITY_TCP_TX_CHECKSUM;
}
#endif /* NX_ENABLE_INTERFACE_CAPABILITY */
/* Place protection while we check the sequence number for the new TCP packet. */
tx_mutex_get(&(ip_ptr -> nx_ip_protection), TX_WAIT_FOREVER);
/* Determine if the sequence number is the same. */
if (sequence_number != socket_ptr -> nx_tcp_socket_tx_sequence)
{
/* Another transmit on this socket took place and changed the sequence. We need to
recalculate the checksum with a new sequence number. Release protection and
just resume the loop. */
tx_mutex_put(&(ip_ptr -> nx_ip_protection));
/* Release the packet when the sequence is changed. */
if (send_packet != packet_ptr)
{
_nx_packet_release(send_packet);
}
/* Regain exclusive access to IP instance. */
tx_mutex_get(&(ip_ptr -> nx_ip_protection), TX_WAIT_FOREVER);
continue;
}
/* Check for the socket being in an established state. It's possible the connection could have gone
away during the TCP checksum calculation above. */
if ((socket_ptr -> nx_tcp_socket_state != NX_TCP_ESTABLISHED) && (socket_ptr -> nx_tcp_socket_state != NX_TCP_CLOSE_WAIT))
{
/* Restore preemption? */
if (preempted == NX_TRUE)
{
tx_thread_preemption_change(_tx_thread_current_ptr, old_threshold, &old_threshold);
}
/* Release protection. */
tx_mutex_put(&(ip_ptr -> nx_ip_protection));
/* Release the packet when the sequence is changed. */
if (send_packet != packet_ptr)
{
_nx_packet_release(send_packet);
}
/* Add debug information. */
NX_PACKET_DEBUG(__FILE__, __LINE__, packet_ptr);
/* Socket is not connected, return an error message. */
return(NX_NOT_CONNECTED);
}
/* Disable interrupts. */
TX_DISABLE
/* Adjust the transmit sequence number to reflect the output data. */
socket_ptr -> nx_tcp_socket_tx_sequence = socket_ptr -> nx_tcp_socket_tx_sequence +
(send_packet -> nx_packet_length - (ULONG)sizeof(NX_TCP_HEADER));
/* Restore interrupts. */
TX_RESTORE
/* Reset zero window probe flag. */
socket_ptr -> nx_tcp_socket_zero_window_probe_has_data = NX_FALSE;
/* Move the checksum into header. */
NX_CHANGE_ULONG_ENDIAN(header_ptr -> nx_tcp_header_word_4);
header_ptr -> nx_tcp_header_word_4 = (checksum << NX_SHIFT_BY_16);
NX_CHANGE_ULONG_ENDIAN(header_ptr -> nx_tcp_header_word_4);
/* Place the packet on the sent list. */
data_left -= (send_packet -> nx_packet_length - (ULONG)sizeof(NX_TCP_HEADER));
if (socket_ptr -> nx_tcp_socket_transmit_sent_head)
{
/* Yes, other packets are on the list already. Just add this one to the tail. */
(socket_ptr -> nx_tcp_socket_transmit_sent_tail) -> nx_packet_union_next.nx_packet_tcp_queue_next = send_packet;
socket_ptr -> nx_tcp_socket_transmit_sent_tail = send_packet;
}
else
{
/* Empty list, just setup the head and tail to the current packet. */
socket_ptr -> nx_tcp_socket_transmit_sent_head = send_packet;
socket_ptr -> nx_tcp_socket_transmit_sent_tail = send_packet;
/* Setup a timeout for the packet at the head of the list. */
socket_ptr -> nx_tcp_socket_timeout = socket_ptr -> nx_tcp_socket_timeout_rate;
socket_ptr -> nx_tcp_socket_timeout_retries = 0;
socket_ptr -> nx_tcp_socket_tx_outstanding_bytes = 0;
}
/* Set the next pointer to NX_PACKET_ENQUEUED to indicate the packet is part of a TCP queue. */
/*lint -e{923} suppress cast of ULONG to pointer. */
send_packet -> nx_packet_union_next.nx_packet_tcp_queue_next = (NX_PACKET *)NX_PACKET_ENQUEUED;
/* Increment the packet sent count. */
socket_ptr -> nx_tcp_socket_transmit_sent_count++;
/* Increase the transmit outstanding byte count. */
socket_ptr -> nx_tcp_socket_tx_outstanding_bytes +=
(send_packet -> nx_packet_length - (ULONG)sizeof(NX_TCP_HEADER));
#ifndef NX_DISABLE_TCP_INFO
/* Increment the TCP packet sent count and bytes sent count. */
ip_ptr -> nx_ip_tcp_packets_sent++;
ip_ptr -> nx_ip_tcp_bytes_sent += send_packet -> nx_packet_length - (ULONG)sizeof(NX_TCP_HEADER);
/* Increment the TCP packet sent count and bytes sent count for the socket. */
socket_ptr -> nx_tcp_socket_packets_sent++;
socket_ptr -> nx_tcp_socket_bytes_sent += send_packet -> nx_packet_length - (ULONG)sizeof(NX_TCP_HEADER);
#endif /* NX_DISABLE_TCP_INFO */
/* If trace is enabled, insert this event into the trace buffer. */
NX_TRACE_IN_LINE_INSERT(NX_TRACE_INTERNAL_TCP_DATA_SEND, ip_ptr, socket_ptr, send_packet, socket_ptr -> nx_tcp_socket_tx_sequence - (send_packet -> nx_packet_length - sizeof(NX_TCP_HEADER)), NX_TRACE_INTERNAL_EVENTS, 0, 0);
/* Send the TCP packet to the IP component. */
#ifndef NX_DISABLE_IPV4
if (socket_ptr -> nx_tcp_socket_connect_ip.nxd_ip_version == NX_IP_VERSION_V4)
{
_nx_ip_packet_send(ip_ptr, send_packet,
socket_ptr -> nx_tcp_socket_connect_ip.nxd_ip_address.v4,
socket_ptr -> nx_tcp_socket_type_of_service,
socket_ptr -> nx_tcp_socket_time_to_live,
NX_IP_TCP,
socket_ptr -> nx_tcp_socket_fragment_enable,
socket_ptr -> nx_tcp_socket_next_hop_address);
}
#endif /* !NX_DISABLE_IPV4 */
#ifdef FEATURE_NX_IPV6
if (socket_ptr -> nx_tcp_socket_connect_ip.nxd_ip_version == NX_IP_VERSION_V6)
{
/* Ready to send the packet! */
_nx_ipv6_packet_send(ip_ptr,
send_packet,
NX_PROTOCOL_TCP,
send_packet -> nx_packet_length,
ip_ptr -> nx_ipv6_hop_limit,
socket_ptr -> nx_tcp_socket_ipv6_addr -> nxd_ipv6_address,
socket_ptr -> nx_tcp_socket_connect_ip.nxd_ip_address.v6);
}
#endif /* FEATURE_NX_IPV6 */
if (data_left == 0)
{
/* Release the packet. */
if (send_packet != packet_ptr)
{
_nx_packet_release(packet_ptr);
}
/* Restore preemption? */
if (preempted == NX_TRUE)
{
tx_thread_preemption_change(_tx_thread_current_ptr, old_threshold, &old_threshold);
}
/* Release the protection. */
tx_mutex_put(&(ip_ptr -> nx_ip_protection));
/* Add debug information. */
NX_PACKET_DEBUG(__FILE__, __LINE__, packet_ptr);
/* Return successful status. */
return(NX_SUCCESS);
}
else
{
/* Adjust the orginal packet. */
current_packet = packet_ptr;
remaining_bytes = packet_ptr -> nx_packet_length - data_left;
#ifndef NX_DISABLE_PACKET_CHAIN
/*lint -e{946} -e{947} suppress pointer subtraction, since it is necessary. */
while (remaining_bytes >
(UINT)(current_packet -> nx_packet_append_ptr - current_packet -> nx_packet_prepend_ptr))
{
/* Trim all data in the train. */
/*lint -e{923} suppress cast of pointer to ULONG. */
packet_ptr -> nx_packet_length -= (ULONG)((ALIGN_TYPE)current_packet -> nx_packet_append_ptr - (ALIGN_TYPE)current_packet -> nx_packet_prepend_ptr);
/*lint -e{923} suppress cast of pointer to ULONG. */
remaining_bytes -= (ULONG)((ALIGN_TYPE)current_packet -> nx_packet_append_ptr - (ALIGN_TYPE)current_packet -> nx_packet_prepend_ptr);
/*lint -e{923} suppress cast between ULONG and pointer. */
current_packet -> nx_packet_append_ptr = (UCHAR *)(((ALIGN_TYPE)current_packet -> nx_packet_append_ptr) & (ALIGN_TYPE)(~3));
current_packet -> nx_packet_prepend_ptr = current_packet -> nx_packet_append_ptr;
/* Pointer to next packet. */
current_packet = current_packet -> nx_packet_next;
}
#endif /* NX_DISABLE_PACKET_CHAIN */
/* Trim partial data in the packet. */
packet_ptr -> nx_packet_length -= remaining_bytes;
current_packet -> nx_packet_prepend_ptr += remaining_bytes;
/* Release the protection. */
tx_mutex_put(&(ip_ptr -> nx_ip_protection));
/* Regain exclusive access to IP instance. */
tx_mutex_get(&(ip_ptr -> nx_ip_protection), TX_WAIT_FOREVER);
}
}
else if ((wait_option) && (_tx_thread_current_ptr != &(ip_ptr -> nx_ip_thread)))
{
/* Suspend the thread on this socket's transmit queue. */
/* Save the return packet pointer address as well. */
_tx_thread_current_ptr -> tx_thread_additional_suspend_info = (VOID *)packet_ptr;
/* Add debug information. */
NX_PACKET_DEBUG(__FILE__, __LINE__, packet_ptr);
/* Increment the suspended thread count. */
socket_ptr -> nx_tcp_socket_transmit_suspended_count++;
if (socket_ptr -> nx_tcp_socket_zero_window_probe_has_data == NX_FALSE)
{
/* Set data for zero window probe. */
socket_ptr -> nx_tcp_socket_zero_window_probe_has_data = NX_TRUE;
socket_ptr -> nx_tcp_socket_zero_window_probe_data = *(packet_ptr -> nx_packet_prepend_ptr);
socket_ptr -> nx_tcp_socket_zero_window_probe_sequence = socket_ptr -> nx_tcp_socket_tx_sequence;
socket_ptr -> nx_tcp_socket_zero_window_probe_failure = 0;
}
/* Need preemption? */
if (preempted == NX_FALSE)
{
UINT ip_thread_priority;
/* Yes. It will be able to send packet out immediately TCP window is non zero. */
tx_thread_info_get(&ip_ptr -> nx_ip_thread, NX_NULL, NX_NULL, NX_NULL, &ip_thread_priority, NX_NULL,
NX_NULL, NX_NULL, NX_NULL);
/*lint -e{644} suppress variable might not be initialized, since "ip_thread_priority" was initialized before TCP is enabled. */
tx_thread_preemption_change(_tx_thread_current_ptr, ip_thread_priority, &old_threshold);
preempted = NX_TRUE;
}
/* Suspend the thread on the transmit suspension list. */
_nx_tcp_socket_thread_suspend(&(socket_ptr -> nx_tcp_socket_transmit_suspension_list), _nx_tcp_transmit_cleanup, socket_ptr, &(ip_ptr -> nx_ip_protection), wait_option);
/* Determine if the send request was successful. */
if (_tx_thread_current_ptr -> tx_thread_suspend_status)
{
/* Restore preemption. */
tx_thread_preemption_change(_tx_thread_current_ptr, old_threshold, &old_threshold);
/* Add debug information. */
NX_PACKET_DEBUG(__FILE__, __LINE__, packet_ptr);
/* Just return the error code. */
return(_tx_thread_current_ptr -> tx_thread_suspend_status);
}
}
else
{
/* Check advertised window. */
if (socket_ptr -> nx_tcp_socket_zero_window_probe_has_data == NX_FALSE)
{
/* Set data for zero window probe. */
socket_ptr -> nx_tcp_socket_zero_window_probe_has_data = NX_TRUE;
socket_ptr -> nx_tcp_socket_zero_window_probe_data = *(packet_ptr -> nx_packet_prepend_ptr);
socket_ptr -> nx_tcp_socket_zero_window_probe_sequence = socket_ptr -> nx_tcp_socket_tx_sequence;
socket_ptr -> nx_tcp_socket_zero_window_probe_failure = 0;
}
/* Determine which transmit error is present. */
if (socket_ptr -> nx_tcp_socket_transmit_sent_count < socket_ptr -> nx_tcp_socket_transmit_queue_maximum)
{
/* Release protection. */
tx_mutex_put(&(ip_ptr -> nx_ip_protection));
/* Add debug information. */
NX_PACKET_DEBUG(__FILE__, __LINE__, packet_ptr);
/* Not a queue depth problem, return a window overflow error. */
return(NX_WINDOW_OVERFLOW);
}
else
{
/* Release protection. */
tx_mutex_put(&(ip_ptr -> nx_ip_protection));
/* Add debug information. */
NX_PACKET_DEBUG(__FILE__, __LINE__, packet_ptr);
/* Return a transmit queue exceeded error. */
return(NX_TX_QUEUE_DEPTH);
}
}
}
}
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