/*      $KAME: dccp.h,v 1.10 2005/10/26 18:46:33 nishida Exp $  */
/* $NetBSD: dccp.h,v 1.1 2015/02/10 19:11:52 rjs Exp $ */

/*
 * Copyright (c) 2003 Joacim Häggmark, Magnus Erixzon, Nils-Erik Mattsson 
 * 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. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS 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 AUTHOR 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.
 *
 * Id: dccp.h,v 1.13 2003/07/31 11:14:41 joahag-9 Exp
 */

#ifndef _NETINET_DCCP_H_
#define _NETINET_DCCP_H_

/*
 * DCCP protocol header
 * draft-ietf-dccp-spec-01.txt 
 */
struct dccphdr {
        u_short         dh_sport;       /* source port */
        u_short         dh_dport;       /* destination port */

        u_int8_t        dh_off;         /* Data offset */
#if BYTE_ORDER == LITTLE_ENDIAN
        u_int8_t        dh_cscov:4,     /* Checksum Length */
                                dh_ccval:4;     /* Number of non data packets */
#else
        u_int8_t        dh_ccval:4,
                                dh_cscov:4;
#endif
        u_short         dh_sum;         /* Checksum */

#if BYTE_ORDER == LITTLE_ENDIAN
        u_int32_t       dh_x:1,         /* long/short sequence number */
                                dh_type:4,
                                dh_res:3,
                                dh_seq:24;      /* Sequence number */
#else
        u_int32_t       dh_res:3,       /* Reserved */
                                dh_type:4,      /* Type of message */
                                dh_x:1,         /* long/short sequence number */
                                dh_seq:24;      
#endif
};

struct dccplhdr {
        u_short         dh_sport;       /* source port */
        u_short         dh_dport;       /* destination port */

        u_int8_t        dh_off;         /* Data offset */
#if BYTE_ORDER == LITTLE_ENDIAN
        u_int8_t        dh_cscov:4,     /* Checksum Length */
                                dh_ccval:4;     /* Number of non data packets */
#else
        u_int8_t        dh_ccval:4,
                                dh_cscov:4;
#endif
        u_short         dh_sum;         /* Checksum */

#if BYTE_ORDER == LITTLE_ENDIAN
        u_int8_t        dh_x:1,         /* long/short sequence number */
                                dh_type:4,
                                dh_res:3;
#else
        u_int8_t        dh_res:3,       /* Reserved */
                                dh_type:4,      /* Type of message */
                                dh_x:1;         /* long/short sequence number */
#endif
        u_int8_t        dh_res2;        
        u_int16_t       dh_seq; 
        u_int32_t       dh_seq2;        /* long sequence number */
};

struct dccp_nathdr {
        u_int16_t       dh_sport;       /* source port */
        u_int16_t       dh_dport;       /* destination port */
        u_int8_t        dh_off;
#if BYTE_ORDER == LITTLE_ENDIAN
        u_int8_t        dh_cscov:4,     /* Checksum Length */
                                dh_ccval:4;     /* Number of non data packets */
#else
        u_int8_t        dh_ccval:4,
                                dh_cscov:4;
#endif

        u_int16_t       dh_seq;
        u_int32_t       dh_seq2;
};


struct dccp_requesthdr {
        u_int32_t       drqh_scode;     /* Service Code */
};

struct dccp_acksubhdr { 
#if BYTE_ORDER == LITTLE_ENDIAN
        u_int32_t       dah_res:8,  /* Reserved */
                                dah_ack:24; /* Acknowledgement number */
#else
        u_int32_t       dah_ack:24,
                                dah_res:8;
#endif
};

struct dccp_acksublhdr {
        u_int16_t       dah_res; /* Reserved */
        u_int16_t       dah_ack; /* Acknowledgement number */
        u_int32_t   dah_ack2;
};

struct dccp_ackhdr {
        struct dccp_acksubhdr   dash;
};
 
struct dccp_acklhdr {
        struct dccp_acksublhdr  dash;
};

struct dccp_resethdr {
        struct dccp_acksublhdr  drth_dash;
        u_int8_t        drth_reason;    /* Reason */
        u_int8_t        drth_data1;     /* Data 1 */
        u_int8_t        drth_data2;     /* Data 2 */
        u_int8_t        drth_data3;     /* Data 3 */
};

#define DCCP_TYPE_REQUEST       0
#define DCCP_TYPE_RESPONSE      1
#define DCCP_TYPE_DATA          2
#define DCCP_TYPE_ACK           3
#define DCCP_TYPE_DATAACK       4
#define DCCP_TYPE_CLOSEREQ      5
#define DCCP_TYPE_CLOSE         6
#define DCCP_TYPE_RESET         7
#define DCCP_TYPE_MOVE          8

#define DCCP_FEATURE_CC         1
#define DCCP_FEATURE_ECN        2
#define DCCP_FEATURE_ACKRATIO   3
#define DCCP_FEATURE_ACKVECTOR  4
#define DCCP_FEATURE_MOBILITY   5
#define DCCP_FEATURE_LOSSWINDOW 6
#define DCCP_FEATURE_CONN_NONCE 8
#define DCCP_FEATURE_IDENTREG   7

#define DCCP_OPT_PADDING                0
#define DCCP_OPT_DATA_DISCARD   1
#define DCCP_OPT_SLOW_RECV              2
#define DCCP_OPT_BUF_CLOSED             3
#define DCCP_OPT_CHANGE_L               32
#define DCCP_OPT_CONFIRM_L              33
#define DCCP_OPT_CHANGE_R               34
#define DCCP_OPT_CONFIRM_R              35
#define DCCP_OPT_INIT_COOKIE    36
#define DCCP_OPT_NDP_COUNT              37
#define DCCP_OPT_ACK_VECTOR0    38
#define DCCP_OPT_ACK_VECTOR1    39
#define DCCP_OPT_RECV_BUF_DROPS 40
#define DCCP_OPT_TIMESTAMP              41
#define DCCP_OPT_TIMESTAMP_ECHO 42
#define DCCP_OPT_ELAPSEDTIME    43
#define DCCP_OPT_DATACHECKSUM   44

#define DCCP_REASON_UNSPEC      0
#define DCCP_REASON_CLOSED      1
#define DCCP_REASON_INVALID     2
#define DCCP_REASON_OPTION_ERR  3
#define DCCP_REASON_FEA_ERR     4
#define DCCP_REASON_CONN_REF    5
#define DCCP_REASON_BAD_SNAME   6
#define DCCP_REASON_BAD_COOKIE  7
#define DCCP_REASON_INV_MOVE    8
#define DCCP_REASON_UNANSW_CH   10
#define DCCP_REASON_FRUITLESS_NEG       11

#define DCCP_CCID               0x01
#define DCCP_CSLEN              0x02
#define DCCP_MAXSEG             0x04
#define DCCP_SERVICE    0x08

#define DCCP_NDP_LIMIT          16
#define DCCP_SEQ_NUM_LIMIT      16777216
#define DCCP_MAX_OPTIONS        32
#define DCCP_CONNECT_TIMER      (75 * hz)
#define DCCP_CLOSE_TIMER        (75 * hz)
#define DCCP_TIMEWAIT_TIMER     (60 * hz)
#define DCCP_MAX_PKTS           100
#endif