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dtls1.h

/* ssl/dtls1.h */
/* 
 * DTLS implementation written by Nagendra Modadugu
 * (nagendra@cs.stanford.edu) for the OpenSSL project 2005.  
 */
/* ====================================================================
 * Copyright (c) 1999-2005 The OpenSSL Project.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer. 
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. All advertising materials mentioning features or use of this
 *    software must display the following acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
 *
 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission. For written permission, please contact
 *    openssl-core@OpenSSL.org.
 *
 * 5. Products derived from this software may not be called "OpenSSL"
 *    nor may "OpenSSL" appear in their names without prior written
 *    permission of the OpenSSL Project.
 *
 * 6. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
 *
 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 * ====================================================================
 *
 * This product includes cryptographic software written by Eric Young
 * (eay@cryptsoft.com).  This product includes software written by Tim
 * Hudson (tjh@cryptsoft.com).
 *
 */

#ifndef HEADER_DTLS1_H 
#define HEADER_DTLS1_H 

#include <openssl/buffer.h>
#include <openssl/pqueue.h>

#ifdef  __cplusplus
extern "C" {
#endif

#define DTLS1_VERSION               0xFEFF
#define DTLS1_BAD_VER               0x0100

#define DTLS1_AD_MISSING_HANDSHAKE_MESSAGE    110

/* lengths of messages */
#define DTLS1_COOKIE_LENGTH                     32

#define DTLS1_RT_HEADER_LENGTH                  13

#define DTLS1_HM_HEADER_LENGTH                  12

#define DTLS1_HM_BAD_FRAGMENT                   -2
#define DTLS1_HM_FRAGMENT_RETRY                 -3

#define DTLS1_CCS_HEADER_LENGTH                  1

#define DTLS1_AL_HEADER_LENGTH                   7


typedef struct dtls1_bitmap_st
      {
      PQ_64BIT map;
      unsigned long length;     /* sizeof the bitmap in bits */
      PQ_64BIT max_seq_num;  /* max record number seen so far */
      } DTLS1_BITMAP;

struct hm_header_st
      {
      unsigned char type;
      unsigned long msg_len;
      unsigned short seq;
      unsigned long frag_off;
      unsigned long frag_len;
      unsigned int is_ccs;
      };

struct ccs_header_st
      {
      unsigned char type;
      unsigned short seq;
      };

struct dtls1_timeout_st
      {
      /* Number of read timeouts so far */
      unsigned int read_timeouts;
      
      /* Number of write timeouts so far */
      unsigned int write_timeouts;
      
      /* Number of alerts received so far */
      unsigned int num_alerts;
      };

typedef struct record_pqueue_st
      {
      unsigned short epoch;
      pqueue q;
      } record_pqueue;

typedef struct hm_fragment_st
      {
      struct hm_header_st msg_header;
      unsigned char *fragment;
      } hm_fragment;

typedef struct dtls1_state_st
      {
      unsigned int send_cookie;
      unsigned char cookie[DTLS1_COOKIE_LENGTH];
      unsigned char rcvd_cookie[DTLS1_COOKIE_LENGTH];
      unsigned int cookie_len;

      /* 
       * The current data and handshake epoch.  This is initially
       * undefined, and starts at zero once the initial handshake is
       * completed 
       */
      unsigned short r_epoch;
      unsigned short w_epoch;

      /* records being received in the current epoch */
      DTLS1_BITMAP bitmap;

      /* renegotiation starts a new set of sequence numbers */
      DTLS1_BITMAP next_bitmap;

      /* handshake message numbers */
      unsigned short handshake_write_seq;
      unsigned short next_handshake_write_seq;

      unsigned short handshake_read_seq;

      /* Received handshake records (processed and unprocessed) */
      record_pqueue unprocessed_rcds;
      record_pqueue processed_rcds;

      /* Buffered handshake messages */
      pqueue buffered_messages;

      /* Buffered (sent) handshake records */
      pqueue sent_messages;

      unsigned int mtu; /* max wire packet size */

      struct hm_header_st w_msg_hdr;
      struct hm_header_st r_msg_hdr;

      struct dtls1_timeout_st timeout;
      
      /* storage for Alert/Handshake protocol data received but not
       * yet processed by ssl3_read_bytes: */
      unsigned char alert_fragment[DTLS1_AL_HEADER_LENGTH];
      unsigned int alert_fragment_len;
      unsigned char handshake_fragment[DTLS1_HM_HEADER_LENGTH];
      unsigned int handshake_fragment_len;

      unsigned int retransmitting;

      } DTLS1_STATE;

typedef struct dtls1_record_data_st
      {
      unsigned char *packet;
      unsigned int   packet_length;
      SSL3_BUFFER    rbuf;
      SSL3_RECORD    rrec;
      } DTLS1_RECORD_DATA;


/* Timeout multipliers (timeout slice is defined in apps/timeouts.h */
#define DTLS1_TMO_READ_COUNT                      2
#define DTLS1_TMO_WRITE_COUNT                     2

#define DTLS1_TMO_ALERT_COUNT                     12

#ifdef  __cplusplus
}
#endif
#endif


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