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1/* $OpenBSD: dtls_local.h,v 1.1 2022/11/26 16:08:55 tb 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_DTLS_LOCL_H
61#define HEADER_DTLS_LOCL_H
62
63#include <sys/time.h>
64
65#include <openssl/dtls1.h>
66
67#include "ssl_local.h"
68#include "tls_content.h"
69
70__BEGIN_HIDDEN_DECLS
71
72typedef struct dtls1_bitmap_st {
73 unsigned long map; /* track 32 packets on 32-bit systems
74 and 64 - on 64-bit systems */
75 unsigned char max_seq_num[8]; /* max record number seen so far,
76 64-bit value in big-endian
77 encoding */
78} DTLS1_BITMAP;
79
80struct dtls1_retransmit_state {
81 SSL_SESSION *session;
82 unsigned short epoch;
83};
84
85struct hm_header_st {
86 unsigned char type;
87 unsigned long msg_len;
88 unsigned short seq;
89 unsigned long frag_off;
90 unsigned long frag_len;
91 unsigned int is_ccs;
92 struct dtls1_retransmit_state saved_retransmit_state;
93};
94
95struct dtls1_timeout_st {
96 /* Number of read timeouts so far */
97 unsigned int read_timeouts;
98
99 /* Number of write timeouts so far */
100 unsigned int write_timeouts;
101
102 /* Number of alerts received so far */
103 unsigned int num_alerts;
104};
105
106struct _pqueue;
107
108typedef struct record_pqueue_st {
109 unsigned short epoch;
110 struct _pqueue *q;
111} record_pqueue;
112
113typedef struct rcontent_pqueue_st {
114 unsigned short epoch;
115 struct _pqueue *q;
116} rcontent_pqueue;
117
118typedef struct hm_fragment_st {
119 struct hm_header_st msg_header;
120 unsigned char *fragment;
121 unsigned char *reassembly;
122} hm_fragment;
123
124typedef struct dtls1_record_data_internal_st {
125 unsigned char *packet;
126 unsigned int packet_length;
127 SSL3_BUFFER_INTERNAL rbuf;
128 SSL3_RECORD_INTERNAL rrec;
129} DTLS1_RECORD_DATA_INTERNAL;
130
131typedef struct dtls1_rcontent_data_internal_st {
132 struct tls_content *rcontent;
133} DTLS1_RCONTENT_DATA_INTERNAL;
134
135struct dtls1_state_st {
136 /* Buffered (sent) handshake records */
137 struct _pqueue *sent_messages;
138
139 /* Indicates when the last handshake msg or heartbeat sent will timeout */
140 struct timeval next_timeout;
141
142 /* Timeout duration */
143 unsigned short timeout_duration;
144
145 unsigned int send_cookie;
146 unsigned char cookie[DTLS1_COOKIE_LENGTH];
147 unsigned char rcvd_cookie[DTLS1_COOKIE_LENGTH];
148 unsigned int cookie_len;
149
150 /* records being received in the current epoch */
151 DTLS1_BITMAP bitmap;
152
153 /* renegotiation starts a new set of sequence numbers */
154 DTLS1_BITMAP next_bitmap;
155
156 /* handshake message numbers */
157 unsigned short handshake_write_seq;
158 unsigned short next_handshake_write_seq;
159
160 unsigned short handshake_read_seq;
161
162 /* Received handshake records (unprocessed) */
163 record_pqueue unprocessed_rcds;
164
165 /* Buffered handshake messages */
166 struct _pqueue *buffered_messages;
167
168 /* Buffered application records.
169 * Only for records between CCS and Finished
170 * to prevent either protocol violation or
171 * unnecessary message loss.
172 */
173 rcontent_pqueue buffered_app_data;
174
175 /* Is set when listening for new connections with dtls1_listen() */
176 unsigned int listen;
177
178 unsigned int mtu; /* max DTLS packet size */
179
180 struct hm_header_st w_msg_hdr;
181 struct hm_header_st r_msg_hdr;
182
183 struct dtls1_timeout_st timeout;
184
185 unsigned int retransmitting;
186 unsigned int change_cipher_spec_ok;
187};
188
189int dtls1_do_write(SSL *s, int type);
190int dtls1_read_bytes(SSL *s, int type, unsigned char *buf, int len, int peek);
191void dtls1_set_message_header(SSL *s, unsigned char mt, unsigned long len,
192 unsigned long frag_off, unsigned long frag_len);
193void dtls1_set_message_header_int(SSL *s, unsigned char mt,
194 unsigned long len, unsigned short seq_num, unsigned long frag_off,
195 unsigned long frag_len);
196
197int do_dtls1_write(SSL *s, int type, const unsigned char *buf,
198 unsigned int len);
199
200int dtls1_write_app_data_bytes(SSL *s, int type, const void *buf, int len);
201int dtls1_write_bytes(SSL *s, int type, const void *buf, int len);
202
203int dtls1_read_failed(SSL *s, int code);
204int dtls1_buffer_message(SSL *s, int ccs);
205int dtls1_retransmit_message(SSL *s, unsigned short seq,
206 unsigned long frag_off, int *found);
207int dtls1_get_queue_priority(unsigned short seq, int is_ccs);
208int dtls1_retransmit_buffered_messages(SSL *s);
209void dtls1_clear_record_buffer(SSL *s);
210int dtls1_get_message_header(CBS *header, struct hm_header_st *msg_hdr);
211void dtls1_reset_read_seq_numbers(SSL *s);
212struct timeval* dtls1_get_timeout(SSL *s, struct timeval* timeleft);
213int dtls1_check_timeout_num(SSL *s);
214int dtls1_handle_timeout(SSL *s);
215const SSL_CIPHER *dtls1_get_cipher(unsigned int u);
216void dtls1_start_timer(SSL *s);
217void dtls1_stop_timer(SSL *s);
218int dtls1_is_timer_expired(SSL *s);
219void dtls1_double_timeout(SSL *s);
220unsigned int dtls1_min_mtu(void);
221
222int dtls1_new(SSL *s);
223void dtls1_free(SSL *s);
224void dtls1_clear(SSL *s);
225long dtls1_ctrl(SSL *s, int cmd, long larg, void *parg);
226
227int dtls1_get_message(SSL *s, int st1, int stn, int mt, long max);
228int dtls1_get_record(SSL *s);
229
230__END_HIDDEN_DECLS
231
232#endif
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