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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
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _nx_secure_dtls_allocate_handshake_packet PORTABLE C */
/* 6.4.3 */
/* AUTHOR */
/* */
/* Timothy Stapko, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function allocates a packet, positions the prepend_ptr and */
/* append_ptr suitable for DTLS handshake packets. */
/* */
/* INPUT */
/* */
/* dtls_session DTLS control block */
/* packet_pool The pool to allocate from */
/* packet_ptr Pointer to the allocated */
/* packet */
/* wait_option Controls timeout actions */
/* */
/* OUTPUT */
/* */
/* status Completion status */
/* */
/* CALLS */
/* */
/* _nx_secure_dtls_packet_allocate Allocate DTLS 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*/
/* */
/**************************************************************************/
UINT _nx_secure_dtls_allocate_handshake_packet(NX_SECURE_DTLS_SESSION *dtls_session,
NX_PACKET_POOL *packet_pool, NX_PACKET **packet_ptr,
ULONG wait_option)
{
UINT status;
/* Release the protection before suspending on nx_packet_allocate. */
tx_mutex_put(&_nx_secure_tls_protection);
status = _nx_secure_dtls_packet_allocate(dtls_session, packet_pool, packet_ptr, wait_option);
/* Get the protection after nx_packet_allocate. */
tx_mutex_get(&_nx_secure_tls_protection, TX_WAIT_FOREVER);
if (status != NX_SECURE_TLS_SUCCESS)
{
return(NX_SECURE_TLS_ALLOCATE_PACKET_FAILED);
}
if (((ULONG)((*packet_ptr) -> nx_packet_data_end) - (ULONG)((*packet_ptr) -> nx_packet_prepend_ptr)) <
NX_SECURE_DTLS_HANDSHAKE_HEADER_SIZE)
{
/* Packet buffer is too small. */
nx_packet_release(*packet_ptr);
return(NX_SECURE_TLS_PACKET_BUFFER_TOO_SMALL);
}
/* Allocate space for the handshake header. */
(*packet_ptr) -> nx_packet_prepend_ptr += NX_SECURE_DTLS_HANDSHAKE_HEADER_SIZE;
(*packet_ptr) -> nx_packet_append_ptr = (*packet_ptr) -> nx_packet_prepend_ptr;
return(NX_SECURE_TLS_SUCCESS);
}
#endif /* NX_SECURE_ENABLE_DTLS */
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