/* @(#) $Header: /tcpdump/master/tcpdump/dccp.h,v 1.5 2006-11-02 09:05:23 hannes Exp $ (LBL) *//* * Copyright (C) Arnaldo Carvalho de Melo 2004 * Copyright (C) Ian McDonald 2005 <iam4@cs.waikato.ac.nz> * Copyright (C) Yoshifumi Nishida 2005 * * This software may be distributed either under the terms of the * BSD-style license that accompanies tcpdump or the GNU GPL version 2 */#ifndef __DCCP_HDR__#define __DCCP_HDR__/** * struct dccp_hdr - generic part of DCCP packet header * * @dccph_sport - Relevant port on the endpoint that sent this packet * @dccph_dport - Relevant port on the other endpoint * @dccph_doff - Data Offset from the start of the DCCP header, in 32-bit words * @dccph_ccval - Used by the HC-Sender CCID * @dccph_cscov - Parts of the packet that are covered by the Checksum field * @dccph_checksum - Internet checksum, depends on dccph_cscov * @dccph_x - 0 = 24 bit sequence number, 1 = 48 * @dccph_type - packet type, see DCCP_PKT_ prefixed macros * @dccph_seq - sequence number high or low order 24 bits, depends on dccph_x */struct dccp_hdr {	u_int16_t	dccph_sport,			dccph_dport;	u_int8_t	dccph_doff;	u_int8_t	dccph_ccval_cscov;	u_int16_t	dccph_checksum;	union {	u_int8_t	dccph_xtr;	u_int32_t	dccph_seq;	}		dccph_xtrs;};#define DCCPH_CCVAL(dh)	(((dh)->dccph_ccval_cscov >> 4) & 0xF)#define DCCPH_CSCOV(dh)	(((dh)->dccph_ccval_cscov) & 0xF)#define DCCPH_X(dh)	((dh)->dccph_xtrs.dccph_xtr & 1)#define DCCPH_TYPE(dh)	(((dh)->dccph_xtrs.dccph_xtr >> 1) & 0xF)#define DCCPH_SEQ(dh)   (((dh)->dccph_xtrs.dccph_seq) >> 8)/** * struct dccp_hdr_ext - the low bits of a 48 bit seq packet * * @dccph_seq_low - low 24 bits of a 48 bit seq packet */struct dccp_hdr_ext {	u_int32_t	dccph_seq_low;};/** * struct dccp_hdr_request - Conection initiation request header * * @dccph_req_service - Service to which the client app wants to connect */struct dccp_hdr_request {	u_int32_t	dccph_req_service;};/** * struct dccp_hdr_ack_bits - acknowledgment bits common to most packets * * @dccph_resp_ack_nr_high - 48 bit ack number high order bits, contains GSR * @dccph_resp_ack_nr_low - 48 bit ack number low order bits, contains GSR */struct dccp_hdr_ack_bits {	u_int32_t	dccph_ra;	u_int32_t	dccph_ack_nr_low;};#define DCCPH_ACK(dh_ack)   ((dh_ack)->dccph_ra >> 8)/** * struct dccp_hdr_response - Conection initiation response header * * @dccph_resp_ack_nr_high - 48 bit ack number high order bits, contains GSR * @dccph_resp_ack_nr_low - 48 bit ack number low order bits, contains GSR * @dccph_resp_service - Echoes the Service Code on a received DCCP-Request */struct dccp_hdr_response {	struct dccp_hdr_ack_bits	dccph_resp_ack;	u_int32_t			dccph_resp_service;};#if 0static inline struct dccp_hdr_data *dccp_hdr_data(struct dccp_hdr *hdrg){	const int ext = DCCPH_X(hdrg) ? sizeof(struct dccp_hdr_ext) : 0;	return (struct dccp_hdr_data *)(((u_char *)hdrg) + sizeof(hdrg) + ext);}#endif/** * struct dccp_hdr_reset - Unconditionally shut down a connection * * @dccph_reset_service - Echoes the Service Code on a received DCCP-Request */struct dccp_hdr_reset {	struct dccp_hdr_ack_bits	dccph_reset_ack;	u_int8_t			dccph_reset_code,					dccph_reset_data[3];};enum dccp_pkt_type {	DCCP_PKT_REQUEST = 0,	DCCP_PKT_RESPONSE,	DCCP_PKT_DATA,	DCCP_PKT_ACK,	DCCP_PKT_DATAACK,	DCCP_PKT_CLOSEREQ,	DCCP_PKT_CLOSE,	DCCP_PKT_RESET,	DCCP_PKT_SYNC,	DCCP_PKT_SYNCACK,	DCCP_PKT_INVALID};enum dccp_reset_codes {	DCCP_RESET_CODE_UNSPECIFIED = 0,	DCCP_RESET_CODE_CLOSED,	DCCP_RESET_CODE_ABORTED,	DCCP_RESET_CODE_NO_CONNECTION,	DCCP_RESET_CODE_PACKET_ERROR,	DCCP_RESET_CODE_OPTION_ERROR,	DCCP_RESET_CODE_MANDATORY_ERROR,	DCCP_RESET_CODE_CONNECTION_REFUSED,	DCCP_RESET_CODE_BAD_SERVICE_CODE,	DCCP_RESET_CODE_TOO_BUSY,	DCCP_RESET_CODE_BAD_INIT_COOKIE,	DCCP_RESET_CODE_AGGRESSION_PENALTY,	__DCCP_RESET_CODE_LAST};#endif /* __DCCP_HDR__ */