lib/libssl/dtls1.h

   1 /* $OpenBSD: dtls1.h,v 1.21 2017/01/22 07:16:39 beck 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/opensslconf.h>
  70 #include <openssl/buffer.h>
  71
  72 #ifdef  __cplusplus
  73 extern "C" {
  74 #endif
  75
  76 #define DTLS1_VERSION                   0xFEFF
  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
  99 typedef 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
 107 struct 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
 114 struct 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
 124 struct ccs_header_st {
 125         unsigned char type;
 126         unsigned short seq;
 127 };
 128
 129 struct 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
 140 struct _pqueue;
 141
 142 typedef struct record_pqueue_st {
 143         unsigned short epoch;
 144         struct _pqueue *q;
 145 } record_pqueue;
 146
 147 typedef struct hm_fragment_st {
 148         struct hm_header_st msg_header;
 149         unsigned char *fragment;
 150         unsigned char *reassembly;
 151 } hm_fragment;
 152
 153 struct dtls1_state_internal_st;
 154
 155 typedef struct dtls1_state_st {
 156         /* Buffered (sent) handshake records */
 157         struct _pqueue *sent_messages;
 158
 159         /* Indicates when the last handshake msg or heartbeat sent will timeout */
 160         struct timeval next_timeout;
 161
 162         /* Timeout duration */
 163         unsigned short timeout_duration;
 164
 165         struct dtls1_state_internal_st *internal;
 166 } DTLS1_STATE;
 167
 168 typedef struct dtls1_record_data_st {
 169         unsigned char *packet;
 170         unsigned int   packet_length;
 171         SSL3_BUFFER    rbuf;
 172         SSL3_RECORD    rrec;
 173 } DTLS1_RECORD_DATA;
 174
 175 #endif
 176
 177 /* Timeout multipliers (timeout slice is defined in apps/timeouts.h */
 178 #define DTLS1_TMO_READ_COUNT                      2
 179 #define DTLS1_TMO_WRITE_COUNT                     2
 180
 181 #define DTLS1_TMO_ALERT_COUNT                     12
 182
 183 #ifdef  __cplusplus
 184 }
 185 #endif
 186 #endif