1 /**************************************************************************/
2 /* */
3 /* Copyright (c) Microsoft Corporation. All rights reserved. */
4 /* */
5 /* This software is licensed under the Microsoft Software License */
6 /* Terms for Microsoft Azure RTOS. Full text of the license can be */
7 /* found in the LICENSE file at https://aka.ms/AzureRTOS_EULA */
8 /* and in the root directory of this software. */
9 /* */
10 /**************************************************************************/
11
12
13 /**************************************************************************/
14 /**************************************************************************/
15 /** */
16 /** NetX Secure Component */
17 /** */
18 /** Datagram Transport Layer Security (DTLS) */
19 /** */
20 /**************************************************************************/
21 /**************************************************************************/
22
23 #define NX_SECURE_SOURCE_CODE
24
25
26 #include "nx_secure_dtls.h"
27
28 #ifdef NX_SECURE_ENABLE_DTLS
29 /**************************************************************************/
30 /* */
31 /* FUNCTION RELEASE */
32 /* */
33 /* _nx_secure_dtls_allocate_handshake_packet PORTABLE C */
34 /* 6.1 */
35 /* AUTHOR */
36 /* */
37 /* Timothy Stapko, Microsoft Corporation */
38 /* */
39 /* DESCRIPTION */
40 /* */
41 /* This function allocates a packet, positions the prepend_ptr and */
42 /* append_ptr suitable for DTLS handshake packets. */
43 /* */
44 /* INPUT */
45 /* */
46 /* dtls_session DTLS control block */
47 /* packet_pool The pool to allocate from */
48 /* packet_ptr Pointer to the allocated */
49 /* packet */
50 /* wait_option Controls timeout actions */
51 /* */
52 /* OUTPUT */
53 /* */
54 /* status Completion status */
55 /* */
56 /* CALLS */
57 /* */
58 /* _nx_secure_dtls_packet_allocate Allocate DTLS packet */
59 /* tx_mutex_get Get protection mutex */
60 /* tx_mutex_put Put protection mutex */
61 /* */
62 /* CALLED BY */
63 /* */
64 /* _nx_secure_dtls_client_handshake DTLS client state machine */
65 /* _nx_secure_dtls_server_handshake DTLS server state machine */
66 /* _nx_secure_dtls_session_start Actual DTLS session start call*/
67 /* */
68 /* RELEASE HISTORY */
69 /* */
70 /* DATE NAME DESCRIPTION */
71 /* */
72 /* 05-19-2020 Timothy Stapko Initial Version 6.0 */
73 /* 09-30-2020 Timothy Stapko Modified comment(s), */
74 /* resulting in version 6.1 */
75 /* */
76 /**************************************************************************/
_nx_secure_dtls_allocate_handshake_packet(NX_SECURE_DTLS_SESSION * dtls_session,NX_PACKET_POOL * packet_pool,NX_PACKET ** packet_ptr,ULONG wait_option)77 UINT _nx_secure_dtls_allocate_handshake_packet(NX_SECURE_DTLS_SESSION *dtls_session,
78 NX_PACKET_POOL *packet_pool, NX_PACKET **packet_ptr,
79 ULONG wait_option)
80 {
81 UINT status;
82
83 /* Release the protection before suspending on nx_packet_allocate. */
84 tx_mutex_put(&_nx_secure_tls_protection);
85
86 status = _nx_secure_dtls_packet_allocate(dtls_session, packet_pool, packet_ptr, wait_option);
87
88 /* Get the protection after nx_packet_allocate. */
89 tx_mutex_get(&_nx_secure_tls_protection, TX_WAIT_FOREVER);
90
91 if (status != NX_SECURE_TLS_SUCCESS)
92 {
93 return(NX_SECURE_TLS_ALLOCATE_PACKET_FAILED);
94 }
95
96 if (((ULONG)((*packet_ptr) -> nx_packet_data_end) - (ULONG)((*packet_ptr) -> nx_packet_prepend_ptr)) <
97 NX_SECURE_DTLS_HANDSHAKE_HEADER_SIZE)
98 {
99
100 /* Packet buffer is too small. */
101 nx_packet_release(*packet_ptr);
102 return(NX_SECURE_TLS_PACKET_BUFFER_TOO_SMALL);
103 }
104
105 /* Allocate space for the handshake header. */
106 (*packet_ptr) -> nx_packet_prepend_ptr += NX_SECURE_DTLS_HANDSHAKE_HEADER_SIZE;
107 (*packet_ptr) -> nx_packet_append_ptr = (*packet_ptr) -> nx_packet_prepend_ptr;
108
109
110 return(NX_SECURE_TLS_SUCCESS);
111 }
112 #endif /* NX_SECURE_ENABLE_DTLS */
113
114
