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1/* ssl/dtls1.h */
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 <openssl/buffer.h>
64#include <openssl/pqueue.h>
65#ifdef OPENSSL_SYS_VMS
66#include <resource.h>
67#include <sys/timeb.h>
68#endif
69#ifdef OPENSSL_SYS_WIN32
70/* Needed for struct timeval */
71#include <winsock.h>
72#elif defined(OPENSSL_SYS_NETWARE) && !defined(_WINSOCK2API_)
73#include <sys/timeval.h>
74#else
75#include <sys/time.h>
76#endif
77
78#ifdef __cplusplus
79extern "C" {
80#endif
81
82#define DTLS1_VERSION 0xFEFF
83#define DTLS1_BAD_VER 0x0100
84
85#if 0
86/* this alert description is not specified anywhere... */
87#define DTLS1_AD_MISSING_HANDSHAKE_MESSAGE 110
88#endif
89
90/* lengths of messages */
91#define DTLS1_COOKIE_LENGTH 256
92
93#define DTLS1_RT_HEADER_LENGTH 13
94
95#define DTLS1_HM_HEADER_LENGTH 12
96
97#define DTLS1_HM_BAD_FRAGMENT -2
98#define DTLS1_HM_FRAGMENT_RETRY -3
99
100#define DTLS1_CCS_HEADER_LENGTH 1
101
102#ifdef DTLS1_AD_MISSING_HANDSHAKE_MESSAGE
103#define DTLS1_AL_HEADER_LENGTH 7
104#else
105#define DTLS1_AL_HEADER_LENGTH 2
106#endif
107
108
109typedef struct dtls1_bitmap_st
110 {
111 unsigned long map; /* track 32 packets on 32-bit systems
112 and 64 - on 64-bit systems */
113 unsigned char max_seq_num[8]; /* max record number seen so far,
114 64-bit value in big-endian
115 encoding */
116 } DTLS1_BITMAP;
117
118struct dtls1_retransmit_state
119 {
120 EVP_CIPHER_CTX *enc_write_ctx; /* cryptographic state */
121 EVP_MD_CTX *write_hash; /* used for mac generation */
122#ifndef OPENSSL_NO_COMP
123 COMP_CTX *compress; /* compression */
124#else
125 char *compress;
126#endif
127 SSL_SESSION *session;
128 unsigned short epoch;
129 };
130
131struct hm_header_st
132 {
133 unsigned char type;
134 unsigned long msg_len;
135 unsigned short seq;
136 unsigned long frag_off;
137 unsigned long frag_len;
138 unsigned int is_ccs;
139 struct dtls1_retransmit_state saved_retransmit_state;
140 };
141
142struct ccs_header_st
143 {
144 unsigned char type;
145 unsigned short seq;
146 };
147
148struct dtls1_timeout_st
149 {
150 /* Number of read timeouts so far */
151 unsigned int read_timeouts;
152
153 /* Number of write timeouts so far */
154 unsigned int write_timeouts;
155
156 /* Number of alerts received so far */
157 unsigned int num_alerts;
158 };
159
160typedef struct record_pqueue_st
161 {
162 unsigned short epoch;
163 pqueue q;
164 } record_pqueue;
165
166typedef struct hm_fragment_st
167 {
168 struct hm_header_st msg_header;
169 unsigned char *fragment;
170 unsigned char *reassembly;
171 } hm_fragment;
172
173typedef struct dtls1_state_st
174 {
175 unsigned int send_cookie;
176 unsigned char cookie[DTLS1_COOKIE_LENGTH];
177 unsigned char rcvd_cookie[DTLS1_COOKIE_LENGTH];
178 unsigned int cookie_len;
179
180 /*
181 * The current data and handshake epoch. This is initially
182 * undefined, and starts at zero once the initial handshake is
183 * completed
184 */
185 unsigned short r_epoch;
186 unsigned short w_epoch;
187
188 /* records being received in the current epoch */
189 DTLS1_BITMAP bitmap;
190
191 /* renegotiation starts a new set of sequence numbers */
192 DTLS1_BITMAP next_bitmap;
193
194 /* handshake message numbers */
195 unsigned short handshake_write_seq;
196 unsigned short next_handshake_write_seq;
197
198 unsigned short handshake_read_seq;
199
200 /* save last sequence number for retransmissions */
201 unsigned char last_write_sequence[8];
202
203 /* Received handshake records (processed and unprocessed) */
204 record_pqueue unprocessed_rcds;
205 record_pqueue processed_rcds;
206
207 /* Buffered handshake messages */
208 pqueue buffered_messages;
209
210 /* Buffered (sent) handshake records */
211 pqueue sent_messages;
212
213 /* Buffered application records.
214 * Only for records between CCS and Finished
215 * to prevent either protocol violation or
216 * unnecessary message loss.
217 */
218 record_pqueue buffered_app_data;
219
220 /* Is set when listening for new connections with dtls1_listen() */
221 unsigned int listen;
222
223 unsigned int mtu; /* max DTLS packet size */
224
225 struct hm_header_st w_msg_hdr;
226 struct hm_header_st r_msg_hdr;
227
228 struct dtls1_timeout_st timeout;
229
230 /* Indicates when the last handshake msg sent will timeout */
231 struct timeval next_timeout;
232
233 /* Timeout duration */
234 unsigned short timeout_duration;
235
236 /* storage for Alert/Handshake protocol data received but not
237 * yet processed by ssl3_read_bytes: */
238 unsigned char alert_fragment[DTLS1_AL_HEADER_LENGTH];
239 unsigned int alert_fragment_len;
240 unsigned char handshake_fragment[DTLS1_HM_HEADER_LENGTH];
241 unsigned int handshake_fragment_len;
242
243 unsigned int retransmitting;
244 unsigned int change_cipher_spec_ok;
245
246 } DTLS1_STATE;
247
248typedef struct dtls1_record_data_st
249 {
250 unsigned char *packet;
251 unsigned int packet_length;
252 SSL3_BUFFER rbuf;
253 SSL3_RECORD rrec;
254 } DTLS1_RECORD_DATA;
255
256
257/* Timeout multipliers (timeout slice is defined in apps/timeouts.h */
258#define DTLS1_TMO_READ_COUNT 2
259#define DTLS1_TMO_WRITE_COUNT 2
260
261#define DTLS1_TMO_ALERT_COUNT 12
262
263#ifdef __cplusplus
264}
265#endif
266#endif
267
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