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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 Secure Component */
/** */
/** Datagram Transport Layer Security (DTLS) */
/** */
/**************************************************************************/
/**************************************************************************/
#define NX_SECURE_SOURCE_CODE
#include "nx_secure_dtls.h"
#ifdef NX_SECURE_ENABLE_DTLS
#include "nx_packet.h"
#include "nx_udp.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _nx_secure_dtls_retransmit PORTABLE C */
/* 6.4.3 */
/* AUTHOR */
/* */
/* Timothy Stapko, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function is primarily responsible for the retransmission of */
/* dropped handshake message flights. */
/* */
/* INPUT */
/* */
/* dtls_session DTLS control block */
/* */
/* OUTPUT */
/* */
/* None */
/* */
/* CALLS */
/* */
/* _nxd_udp_socket_send Send UDP packet */
/* _nxd_udp_socket_source_send Send UDP packet with specific */
/* source addresss */
/* tx_mutex_get Get protection mutex */
/* tx_mutex_put Put protection mutex */
/* */
/* CALLED BY */
/* */
/* _nx_secure_dtls_client_handshake DTLS client state machine */
/* _nx_secure_dtls_server_handshake DTLS server state machine */
/* _nx_secure_dtls_session_start Actual DTLS session start call*/
/* */
/**************************************************************************/
VOID _nx_secure_dtls_retransmit(NX_SECURE_DTLS_SESSION *dtls_session)
{
NX_PACKET *packet_ptr;
NX_PACKET *next_ptr;
/* Get a pointer to the sent queue. */
packet_ptr = dtls_session -> nx_secure_dtls_transmit_sent_head;
/* Check for flights that need to be retransmitted. */
while (packet_ptr &&
(packet_ptr != (NX_PACKET *)NX_PACKET_ENQUEUED) &&
(packet_ptr -> nx_packet_queue_next == (NX_PACKET *)NX_DRIVER_TX_DONE))
{
/* Get a pointer to the next packet in the queue. */
next_ptr = packet_ptr -> nx_packet_union_next.nx_packet_tcp_queue_next;
/* Clear the queue next pointer in this packet. */
packet_ptr -> nx_packet_queue_next = NX_NULL;
/* Skip UDP header. */
packet_ptr -> nx_packet_prepend_ptr += sizeof(NX_UDP_HEADER);
packet_ptr -> nx_packet_length -= sizeof(NX_UDP_HEADER);
/* Release the protection. */
tx_mutex_put(&_nx_secure_tls_protection);
/* Re-send the packets in the queue. */
/* If local IP address index is set, call _nxd_udp_socket_source_send
to ensure the source IP address is correct. */
if (dtls_session -> nx_secure_dtls_local_ip_address_index == 0xffffffff)
{
/* Send the UDP packet(s) containing our record. */
_nxd_udp_socket_send(dtls_session -> nx_secure_dtls_udp_socket, packet_ptr,
&dtls_session -> nx_secure_dtls_remote_ip_address,
dtls_session -> nx_secure_dtls_remote_port);
}
else
{
/* Send the UDP packet(s) containing our record. */
_nxd_udp_socket_source_send(dtls_session -> nx_secure_dtls_udp_socket, packet_ptr,
&dtls_session -> nx_secure_dtls_remote_ip_address,
dtls_session -> nx_secure_dtls_remote_port,
dtls_session -> nx_secure_dtls_local_ip_address_index);
}
/* Get the protection. */
tx_mutex_get(&_nx_secure_tls_protection, TX_WAIT_FOREVER);
/* Advance to the next packet. */
packet_ptr = next_ptr;
}
dtls_session -> nx_secure_dtls_timeout_retries++;
dtls_session -> nx_secure_dtls_handshake_timeout = NX_SECURE_DTLS_RETRANSMIT_TIMEOUT <<
(dtls_session -> nx_secure_dtls_timeout_retries * NX_SECURE_DTLS_RETRANSMIT_RETRY_SHIFT);
if (dtls_session -> nx_secure_dtls_handshake_timeout > NX_SECURE_DTLS_MAXIMUM_RETRANSMIT_TIMEOUT)
{
dtls_session -> nx_secure_dtls_handshake_timeout = NX_SECURE_DTLS_MAXIMUM_RETRANSMIT_TIMEOUT;
}
}
#endif /* NX_SECURE_ENABLE_DTLS */
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