3 * DTLS implementation written by Nagendra Modadugu
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4 * (nagendra@cs.stanford.edu) for the OpenSSL project 2005.
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6 /* ====================================================================
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7 * Copyright (c) 1999-2005 The OpenSSL Project. All rights reserved.
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9 * Redistribution and use in source and binary forms, with or without
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10 * modification, are permitted provided that the following conditions
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13 * 1. Redistributions of source code must retain the above copyright
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14 * notice, this list of conditions and the following disclaimer.
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16 * 2. Redistributions in binary form must reproduce the above copyright
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17 * notice, this list of conditions and the following disclaimer in
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18 * the documentation and/or other materials provided with the
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21 * 3. All advertising materials mentioning features or use of this
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22 * software must display the following acknowledgment:
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23 * "This product includes software developed by the OpenSSL Project
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24 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
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26 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
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27 * endorse or promote products derived from this software without
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28 * prior written permission. For written permission, please contact
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29 * openssl-core@OpenSSL.org.
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31 * 5. Products derived from this software may not be called "OpenSSL"
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32 * nor may "OpenSSL" appear in their names without prior written
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33 * permission of the OpenSSL Project.
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35 * 6. Redistributions of any form whatsoever must retain the following
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37 * "This product includes software developed by the OpenSSL Project
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38 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
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40 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
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41 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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43 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
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44 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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45 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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46 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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47 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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49 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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50 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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51 * OF THE POSSIBILITY OF SUCH DAMAGE.
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52 * ====================================================================
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54 * This product includes cryptographic software written by Eric Young
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55 * (eay@cryptsoft.com). This product includes software written by Tim
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56 * Hudson (tjh@cryptsoft.com).
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60 #ifndef HEADER_DTLS1_H
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61 #define HEADER_DTLS1_H
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63 #include <openssl/buffer.h>
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64 #include <openssl/pqueue.h>
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65 #ifdef OPENSSL_SYS_VMS
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66 #include <resource.h>
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67 #include <sys/timeb.h>
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69 #ifdef OPENSSL_SYS_WIN32
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70 /* Needed for struct timeval */
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71 #include <winsock.h>
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72 #elif defined(OPENSSL_SYS_NETWARE) && !defined(_WINSOCK2API_)
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73 #include <sys/timeval.h>
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75 #if defined(OPENSSL_SYS_VXWORKS)
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76 #include <sys/times.h>
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78 #include <sys/time.h>
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86 #define DTLS1_VERSION 0xFEFF
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87 #define DTLS1_BAD_VER 0x0100
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90 /* this alert description is not specified anywhere... */
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91 #define DTLS1_AD_MISSING_HANDSHAKE_MESSAGE 110
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94 /* lengths of messages */
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95 #define DTLS1_COOKIE_LENGTH 256
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97 #define DTLS1_RT_HEADER_LENGTH 13
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99 #define DTLS1_HM_HEADER_LENGTH 12
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101 #define DTLS1_HM_BAD_FRAGMENT -2
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102 #define DTLS1_HM_FRAGMENT_RETRY -3
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104 #define DTLS1_CCS_HEADER_LENGTH 1
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106 #ifdef DTLS1_AD_MISSING_HANDSHAKE_MESSAGE
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107 #define DTLS1_AL_HEADER_LENGTH 7
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109 #define DTLS1_AL_HEADER_LENGTH 2
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112 #ifndef OPENSSL_NO_SSL_INTERN
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114 #ifndef OPENSSL_NO_SCTP
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115 #define DTLS1_SCTP_AUTH_LABEL "EXPORTER_DTLS_OVER_SCTP"
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118 typedef struct dtls1_bitmap_st
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120 unsigned long map; /* track 32 packets on 32-bit systems
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121 and 64 - on 64-bit systems */
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122 unsigned char max_seq_num[8]; /* max record number seen so far,
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123 64-bit value in big-endian
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127 struct dtls1_retransmit_state
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129 EVP_CIPHER_CTX *enc_write_ctx; /* cryptographic state */
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130 EVP_MD_CTX *write_hash; /* used for mac generation */
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131 #ifndef OPENSSL_NO_COMP
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132 COMP_CTX *compress; /* compression */
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136 SSL_SESSION *session;
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137 unsigned short epoch;
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140 struct hm_header_st
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142 unsigned char type;
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143 unsigned long msg_len;
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144 unsigned short seq;
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145 unsigned long frag_off;
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146 unsigned long frag_len;
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147 unsigned int is_ccs;
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148 struct dtls1_retransmit_state saved_retransmit_state;
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151 struct ccs_header_st
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153 unsigned char type;
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154 unsigned short seq;
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157 struct dtls1_timeout_st
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159 /* Number of read timeouts so far */
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160 unsigned int read_timeouts;
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162 /* Number of write timeouts so far */
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163 unsigned int write_timeouts;
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165 /* Number of alerts received so far */
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166 unsigned int num_alerts;
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169 typedef struct record_pqueue_st
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171 unsigned short epoch;
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175 typedef struct hm_fragment_st
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177 struct hm_header_st msg_header;
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178 unsigned char *fragment;
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179 unsigned char *reassembly;
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182 typedef struct dtls1_state_st
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184 unsigned int send_cookie;
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185 unsigned char cookie[DTLS1_COOKIE_LENGTH];
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186 unsigned char rcvd_cookie[DTLS1_COOKIE_LENGTH];
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187 unsigned int cookie_len;
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190 * The current data and handshake epoch. This is initially
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191 * undefined, and starts at zero once the initial handshake is
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194 unsigned short r_epoch;
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195 unsigned short w_epoch;
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197 /* records being received in the current epoch */
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198 DTLS1_BITMAP bitmap;
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200 /* renegotiation starts a new set of sequence numbers */
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201 DTLS1_BITMAP next_bitmap;
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203 /* handshake message numbers */
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204 unsigned short handshake_write_seq;
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205 unsigned short next_handshake_write_seq;
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207 unsigned short handshake_read_seq;
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209 /* save last sequence number for retransmissions */
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210 unsigned char last_write_sequence[8];
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212 /* Received handshake records (processed and unprocessed) */
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213 record_pqueue unprocessed_rcds;
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214 record_pqueue processed_rcds;
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216 /* Buffered handshake messages */
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217 pqueue buffered_messages;
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219 /* Buffered (sent) handshake records */
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220 pqueue sent_messages;
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222 /* Buffered application records.
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223 * Only for records between CCS and Finished
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224 * to prevent either protocol violation or
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225 * unnecessary message loss.
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227 record_pqueue buffered_app_data;
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229 /* Is set when listening for new connections with dtls1_listen() */
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230 unsigned int listen;
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232 unsigned int mtu; /* max DTLS packet size */
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234 struct hm_header_st w_msg_hdr;
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235 struct hm_header_st r_msg_hdr;
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237 struct dtls1_timeout_st timeout;
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239 /* Indicates when the last handshake msg or heartbeat sent will timeout */
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240 struct timeval next_timeout;
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242 /* Timeout duration */
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243 unsigned short timeout_duration;
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245 /* storage for Alert/Handshake protocol data received but not
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246 * yet processed by ssl3_read_bytes: */
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247 unsigned char alert_fragment[DTLS1_AL_HEADER_LENGTH];
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248 unsigned int alert_fragment_len;
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249 unsigned char handshake_fragment[DTLS1_HM_HEADER_LENGTH];
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250 unsigned int handshake_fragment_len;
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252 unsigned int retransmitting;
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253 unsigned int change_cipher_spec_ok;
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255 #ifndef OPENSSL_NO_SCTP
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256 /* used when SSL_ST_XX_FLUSH is entered */
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259 int shutdown_received;
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264 typedef struct dtls1_record_data_st
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266 unsigned char *packet;
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267 unsigned int packet_length;
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270 #ifndef OPENSSL_NO_SCTP
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271 struct bio_dgram_sctp_rcvinfo recordinfo;
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273 } DTLS1_RECORD_DATA;
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277 /* Timeout multipliers (timeout slice is defined in apps/timeouts.h */
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278 #define DTLS1_TMO_READ_COUNT 2
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279 #define DTLS1_TMO_WRITE_COUNT 2
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281 #define DTLS1_TMO_ALERT_COUNT 12
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