* Copyright (c) 2003 Joacim H�ggmark, Magnus Erixzon, Nils-Erik Mattsson

/* $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 H�ggmark, 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