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1/* $OpenBSD: dtls1.h,v 1.17 2015/02/09 10:53:28 jsing Exp $ */
2/*
3 * DTLS implementation written by Nagendra Modadugu
4 * (nagendra@cs.stanford.edu) for the OpenSSL project 2005.
5 */
6/* ====================================================================
7 * Copyright (c) 1999-2005 The OpenSSL Project. All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 *
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 *
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in
18 * the documentation and/or other materials provided with the
19 * distribution.
20 *
21 * 3. All advertising materials mentioning features or use of this
22 * software must display the following acknowledgment:
23 * "This product includes software developed by the OpenSSL Project
24 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
25 *
26 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
27 * endorse or promote products derived from this software without
28 * prior written permission. For written permission, please contact
29 * openssl-core@OpenSSL.org.
30 *
31 * 5. Products derived from this software may not be called "OpenSSL"
32 * nor may "OpenSSL" appear in their names without prior written
33 * permission of the OpenSSL Project.
34 *
35 * 6. Redistributions of any form whatsoever must retain the following
36 * acknowledgment:
37 * "This product includes software developed by the OpenSSL Project
38 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
39 *
40 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
41 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
43 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
44 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
45 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
46 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
47 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
49 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
50 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
51 * OF THE POSSIBILITY OF SUCH DAMAGE.
52 * ====================================================================
53 *
54 * This product includes cryptographic software written by Eric Young
55 * (eay@cryptsoft.com). This product includes software written by Tim
56 * Hudson (tjh@cryptsoft.com).
57 *
58 */
59
60#ifndef HEADER_DTLS1_H
61#define HEADER_DTLS1_H
62
63#include <sys/time.h>
64
65#include <stdio.h>
66#include <stdlib.h>
67#include <string.h>
68
69#include <openssl/buffer.h>
70
71#ifdef __cplusplus
72extern "C" {
73#endif
74
75#define DTLS1_VERSION 0xFEFF
76#define DTLS1_BAD_VER 0x0100
77
78/* lengths of messages */
79#define DTLS1_COOKIE_LENGTH 256
80
81#define DTLS1_RT_HEADER_LENGTH 13
82
83#define DTLS1_HM_HEADER_LENGTH 12
84
85#define DTLS1_HM_BAD_FRAGMENT -2
86#define DTLS1_HM_FRAGMENT_RETRY -3
87
88#define DTLS1_CCS_HEADER_LENGTH 1
89
90#ifdef DTLS1_AD_MISSING_HANDSHAKE_MESSAGE
91#define DTLS1_AL_HEADER_LENGTH 7
92#else
93#define DTLS1_AL_HEADER_LENGTH 2
94#endif
95
96#ifndef OPENSSL_NO_SSL_INTERN
97
98
99typedef struct dtls1_bitmap_st {
100 unsigned long map; /* track 32 packets on 32-bit systems
101 and 64 - on 64-bit systems */
102 unsigned char max_seq_num[8]; /* max record number seen so far,
103 64-bit value in big-endian
104 encoding */
105} DTLS1_BITMAP;
106
107struct dtls1_retransmit_state {
108 EVP_CIPHER_CTX *enc_write_ctx; /* cryptographic state */
109 EVP_MD_CTX *write_hash; /* used for mac generation */
110 SSL_SESSION *session;
111 unsigned short epoch;
112};
113
114struct hm_header_st {
115 unsigned char type;
116 unsigned long msg_len;
117 unsigned short seq;
118 unsigned long frag_off;
119 unsigned long frag_len;
120 unsigned int is_ccs;
121 struct dtls1_retransmit_state saved_retransmit_state;
122};
123
124struct ccs_header_st {
125 unsigned char type;
126 unsigned short seq;
127};
128
129struct dtls1_timeout_st {
130 /* Number of read timeouts so far */
131 unsigned int read_timeouts;
132
133 /* Number of write timeouts so far */
134 unsigned int write_timeouts;
135
136 /* Number of alerts received so far */
137 unsigned int num_alerts;
138};
139
140struct _pqueue;
141
142typedef struct record_pqueue_st {
143 unsigned short epoch;
144 struct _pqueue *q;
145} record_pqueue;
146
147typedef struct hm_fragment_st {
148 struct hm_header_st msg_header;
149 unsigned char *fragment;
150 unsigned char *reassembly;
151} hm_fragment;
152
153typedef struct dtls1_state_st {
154 unsigned int send_cookie;
155 unsigned char cookie[DTLS1_COOKIE_LENGTH];
156 unsigned char rcvd_cookie[DTLS1_COOKIE_LENGTH];
157 unsigned int cookie_len;
158
159 /*
160 * The current data and handshake epoch. This is initially
161 * undefined, and starts at zero once the initial handshake is
162 * completed
163 */
164 unsigned short r_epoch;
165 unsigned short w_epoch;
166
167 /* records being received in the current epoch */
168 DTLS1_BITMAP bitmap;
169
170 /* renegotiation starts a new set of sequence numbers */
171 DTLS1_BITMAP next_bitmap;
172
173 /* handshake message numbers */
174 unsigned short handshake_write_seq;
175 unsigned short next_handshake_write_seq;
176
177 unsigned short handshake_read_seq;
178
179 /* save last sequence number for retransmissions */
180 unsigned char last_write_sequence[8];
181
182 /* Received handshake records (processed and unprocessed) */
183 record_pqueue unprocessed_rcds;
184 record_pqueue processed_rcds;
185
186 /* Buffered handshake messages */
187 struct _pqueue *buffered_messages;
188
189 /* Buffered (sent) handshake records */
190 struct _pqueue *sent_messages;
191
192 /* Buffered application records.
193 * Only for records between CCS and Finished
194 * to prevent either protocol violation or
195 * unnecessary message loss.
196 */
197 record_pqueue buffered_app_data;
198
199 /* Is set when listening for new connections with dtls1_listen() */
200 unsigned int listen;
201
202 unsigned int mtu; /* max DTLS packet size */
203
204 struct hm_header_st w_msg_hdr;
205 struct hm_header_st r_msg_hdr;
206
207 struct dtls1_timeout_st timeout;
208
209 /* Indicates when the last handshake msg or heartbeat sent will timeout */
210 struct timeval next_timeout;
211
212 /* Timeout duration */
213 unsigned short timeout_duration;
214
215 /* storage for Alert/Handshake protocol data received but not
216 * yet processed by ssl3_read_bytes: */
217 unsigned char alert_fragment[DTLS1_AL_HEADER_LENGTH];
218 unsigned int alert_fragment_len;
219 unsigned char handshake_fragment[DTLS1_HM_HEADER_LENGTH];
220 unsigned int handshake_fragment_len;
221
222 unsigned int retransmitting;
223 unsigned int change_cipher_spec_ok;
224
225
226} DTLS1_STATE;
227
228typedef struct dtls1_record_data_st {
229 unsigned char *packet;
230 unsigned int packet_length;
231 SSL3_BUFFER rbuf;
232 SSL3_RECORD rrec;
233} DTLS1_RECORD_DATA;
234
235#endif
236
237/* Timeout multipliers (timeout slice is defined in apps/timeouts.h */
238#define DTLS1_TMO_READ_COUNT 2
239#define DTLS1_TMO_WRITE_COUNT 2
240
241#define DTLS1_TMO_ALERT_COUNT 12
242
243#ifdef __cplusplus
244}
245#endif
246#endif
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