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