crypto/external/bsd/openssl/dist/ssl/dtls1.h

   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 /* Unless _XOPEN_SOURCE_EXTENDED is defined, struct timeval will not be
  64    properly defined with DEC C, at least on VMS */
  65 #if defined(__DECC) || defined(__DECCXX)
  66 #define _XOPEN_SOURCE_EXTENDED
  67 #endif
  68
  69 #include <openssl/buffer.h>
  70 #include <openssl/pqueue.h>
  71 #ifdef OPENSSL_SYS_WIN32
  72 /* Needed for struct timeval */
  73 #include <winsock.h>
  74 #elif defined(OPENSSL_SYS_NETWARE) && !defined(_WINSOCK2API_)
  75 #include <sys/timeval.h>
  76 #else
  77 #include <sys/time.h>
  78 #endif
  79
  80 #ifdef  __cplusplus
  81 extern "C" {
  82 #endif
  83
  84 #define DTLS1_VERSION                   0xFEFF
  85 #define DTLS1_BAD_VER                   0x0100
  86
  87 #if 0
  88 /* this alert description is not specified anywhere... */
  89 #define DTLS1_AD_MISSING_HANDSHAKE_MESSAGE    110
  90 #endif
  91
  92 /* lengths of messages */
  93 #define DTLS1_COOKIE_LENGTH                     256
  94
  95 #define DTLS1_RT_HEADER_LENGTH                  13
  96
  97 #define DTLS1_HM_HEADER_LENGTH                  12
  98
  99 #define DTLS1_HM_BAD_FRAGMENT                   -2
 100 #define DTLS1_HM_FRAGMENT_RETRY                 -3
 101
 102 #define DTLS1_CCS_HEADER_LENGTH                  1
 103
 104 #ifdef DTLS1_AD_MISSING_HANDSHAKE_MESSAGE
 105 #define DTLS1_AL_HEADER_LENGTH                   7
 106 #else
 107 #define DTLS1_AL_HEADER_LENGTH                   2
 108 #endif
 109
 110
 111 typedef struct dtls1_bitmap_st
 112         {
 113         unsigned long map;              /* track 32 packets on 32-bit systems
 114                                            and 64 - on 64-bit systems */
 115         unsigned char max_seq_num[8];   /* max record number seen so far,
 116                                            64-bit value in big-endian
 117                                            encoding */
 118         } DTLS1_BITMAP;
 119
 120 struct dtls1_retransmit_state
 121         {
 122         EVP_CIPHER_CTX *enc_write_ctx;  /* cryptographic state */
 123         EVP_MD_CTX *write_hash;                 /* used for mac generation */
 124 #ifndef OPENSSL_NO_COMP
 125         COMP_CTX *compress;                             /* compression */
 126 #else
 127         char *compress;
 128 #endif
 129         SSL_SESSION *session;
 130         unsigned short epoch;
 131         };
 132
 133 struct hm_header_st
 134         {
 135         unsigned char type;
 136         unsigned long msg_len;
 137         unsigned short seq;
 138         unsigned long frag_off;
 139         unsigned long frag_len;
 140         unsigned int is_ccs;
 141         struct dtls1_retransmit_state saved_retransmit_state;
 142         };
 143
 144 struct ccs_header_st
 145         {
 146         unsigned char type;
 147         unsigned short seq;
 148         };
 149
 150 struct dtls1_timeout_st
 151         {
 152         /* Number of read timeouts so far */
 153         unsigned int read_timeouts;
 154
 155         /* Number of write timeouts so far */
 156         unsigned int write_timeouts;
 157
 158         /* Number of alerts received so far */
 159         unsigned int num_alerts;
 160         };
 161
 162 typedef struct record_pqueue_st
 163         {
 164         unsigned short epoch;
 165         pqueue q;
 166         } record_pqueue;
 167
 168 typedef struct hm_fragment_st
 169         {
 170         struct hm_header_st msg_header;
 171         unsigned char *fragment;
 172         } hm_fragment;
 173
 174 typedef struct dtls1_state_st
 175         {
 176         unsigned int send_cookie;
 177         unsigned char cookie[DTLS1_COOKIE_LENGTH];
 178         unsigned char rcvd_cookie[DTLS1_COOKIE_LENGTH];
 179         unsigned int cookie_len;
 180
 181         /*
 182          * The current data and handshake epoch.  This is initially
 183          * undefined, and starts at zero once the initial handshake is
 184          * completed
 185          */
 186         unsigned short r_epoch;
 187         unsigned short w_epoch;
 188
 189         /* records being received in the current epoch */
 190         DTLS1_BITMAP bitmap;
 191
 192         /* renegotiation starts a new set of sequence numbers */
 193         DTLS1_BITMAP next_bitmap;
 194
 195         /* handshake message numbers */
 196         unsigned short handshake_write_seq;
 197         unsigned short next_handshake_write_seq;
 198
 199         unsigned short handshake_read_seq;
 200
 201         /* save last sequence number for retransmissions */
 202         unsigned char last_write_sequence[8];
 203
 204         /* Received handshake records (processed and unprocessed) */
 205         record_pqueue unprocessed_rcds;
 206         record_pqueue processed_rcds;
 207
 208         /* Buffered handshake messages */
 209         pqueue buffered_messages;
 210
 211         /* Buffered (sent) handshake records */
 212         pqueue sent_messages;
 213
 214         /* Buffered application records.
 215          * Only for records between CCS and Finished
 216          * to prevent either protocol violation or
 217          * unnecessary message loss.
 218          */
 219         record_pqueue buffered_app_data;
 220
 221         /* Is set when listening for new connections with dtls1_listen() */
 222         unsigned int listen;
 223
 224         unsigned int mtu; /* max DTLS packet size */
 225
 226         struct hm_header_st w_msg_hdr;
 227         struct hm_header_st r_msg_hdr;
 228
 229         struct dtls1_timeout_st timeout;
 230
 231         /* Indicates when the last handshake msg sent will timeout */
 232         struct timeval next_timeout;
 233
 234         /* Timeout duration */
 235         unsigned short timeout_duration;
 236
 237         /* storage for Alert/Handshake protocol data received but not
 238          * yet processed by ssl3_read_bytes: */
 239         unsigned char alert_fragment[DTLS1_AL_HEADER_LENGTH];
 240         unsigned int alert_fragment_len;
 241         unsigned char handshake_fragment[DTLS1_HM_HEADER_LENGTH];
 242         unsigned int handshake_fragment_len;
 243
 244         unsigned int retransmitting;
 245         unsigned int change_cipher_spec_ok;
 246
 247         } DTLS1_STATE;
 248
 249 typedef struct dtls1_record_data_st
 250         {
 251         unsigned char *packet;
 252         unsigned int   packet_length;
 253         SSL3_BUFFER    rbuf;
 254         SSL3_RECORD    rrec;
 255         } DTLS1_RECORD_DATA;
 256
 257
 258 /* Timeout multipliers (timeout slice is defined in apps/timeouts.h */
 259 #define DTLS1_TMO_READ_COUNT                      2
 260 #define DTLS1_TMO_WRITE_COUNT                     2
 261
 262 #define DTLS1_TMO_ALERT_COUNT                     12
 263
 264 #ifdef  __cplusplus
 265 }
 266 #endif
 267 #endif
 268