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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 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"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _nx_secure_dtls_retransmit_queue_flush PORTABLE C */
/* 6.1.10 */
/* AUTHOR */
/* */
/* Timothy Stapko, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function flushes the DTLS transmit queue when the appropriate */
/* response is received from the remote host, clearing out the */
/* previously-sent flight, resetting the queue for the next flight. */
/* */
/* INPUT */
/* */
/* dtls_session DTLS control block */
/* */
/* OUTPUT */
/* */
/* None */
/* */
/* CALLS */
/* */
/* nx_secure_tls_packet_release Release packet */
/* 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*/
/* */
/* RELEASE HISTORY */
/* */
/* DATE NAME DESCRIPTION */
/* */
/* 05-19-2020 Timothy Stapko Initial Version 6.0 */
/* 09-30-2020 Timothy Stapko Modified comment(s), */
/* released packet securely, */
/* resulting in version 6.1 */
/* 01-31-2022 Timothy Stapko Modified comment(s), */
/* fixed packet leak, */
/* resulting in version 6.1.10 */
/* */
/**************************************************************************/
VOID _nx_secure_dtls_retransmit_queue_flush(NX_SECURE_DTLS_SESSION *dtls_session)
{
TX_INTERRUPT_SAVE_AREA
NX_PACKET *packet_ptr;
NX_PACKET *next_packet_ptr;
/* Get the protection. */
tx_mutex_get(&_nx_secure_tls_protection, TX_WAIT_FOREVER);
/* Setup packet pointer. */
packet_ptr = dtls_session -> nx_secure_dtls_transmit_sent_head;
/* Clear the head and the tail pointers. */
dtls_session -> nx_secure_dtls_transmit_sent_head = NX_NULL;
dtls_session -> nx_secure_dtls_transmit_sent_tail = NX_NULL;
/* Loop to clear all the packets out. */
while (packet_ptr &&
(packet_ptr != (NX_PACKET *)NX_PACKET_ENQUEUED))
{
/* Disable interrupts. */
TX_DISABLE
/* Pickup the next queued packet. */
next_packet_ptr = packet_ptr -> nx_packet_union_next.nx_packet_tcp_queue_next;
/* Mark the packet as no longer being in a TCP queue. */
/*lint -e{923} suppress cast of ULONG to pointer. */
packet_ptr -> nx_packet_union_next.nx_packet_tcp_queue_next = (NX_PACKET *)NX_PACKET_ALLOCATED;
/* Has the packet been transmitted? */
if (packet_ptr -> nx_packet_queue_next == ((NX_PACKET *)NX_DRIVER_TX_DONE))
{
/* Yes, the driver has already released the packet. */
/* Restore interrupts. */
TX_RESTORE
/* Release the packet. */
nx_secure_tls_packet_release(packet_ptr);
}
else
{
/* Restore interrupts. */
TX_RESTORE
}
/* Move to the next packet. */
packet_ptr = next_packet_ptr;
/* Decrease the queued packet count. */
dtls_session -> nx_secure_dtls_transmit_sent_count--;
}
/* Release the protection before suspending on event. */
tx_mutex_put(&_nx_secure_tls_protection);
}
#endif /* NX_SECURE_ENABLE_DTLS */
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