dccp.h revision 162017
1162017Ssam/* @(#) $Header: /tcpdump/master/tcpdump/dccp.h,v 1.1.2.2 2005/09/20 06:25:45 guy Exp $ (LBL) */ 2162017Ssam/* 3162017Ssam * Copyright (C) Arnaldo Carvalho de Melo 2004 4162017Ssam * Copyright (C) Ian McDonald 2005 <iam4@cs.waikato.ac.nz> 5162017Ssam * Copyright (C) Yoshifumi Nishida 2005 6162017Ssam * 7162017Ssam * This software may be distributed either under the terms of the 8162017Ssam * BSD-style license that accompanies tcpdump or the GNU GPL version 2 9162017Ssam */ 10162017Ssam 11162017Ssam#ifndef __DCCP_HDR__ 12162017Ssam#define __DCCP_HDR__ 13162017Ssam 14162017Ssam/** 15162017Ssam * struct dccp_hdr - generic part of DCCP packet header 16162017Ssam * 17162017Ssam * @dccph_sport - Relevant port on the endpoint that sent this packet 18162017Ssam * @dccph_dport - Relevant port on the other endpoint 19162017Ssam * @dccph_doff - Data Offset from the start of the DCCP header, in 32-bit words 20162017Ssam * @dccph_ccval - Used by the HC-Sender CCID 21162017Ssam * @dccph_cscov - Parts of the packet that are covered by the Checksum field 22162017Ssam * @dccph_checksum - Internet checksum, depends on dccph_cscov 23162017Ssam * @dccph_x - 0 = 24 bit sequence number, 1 = 48 24162017Ssam * @dccph_type - packet type, see DCCP_PKT_ prefixed macros 25162017Ssam * @dccph_seq - sequence number high or low order 24 bits, depends on dccph_x 26162017Ssam */ 27162017Ssamstruct dccp_hdr { 28162017Ssam u_int16_t dccph_sport, 29162017Ssam dccph_dport; 30162017Ssam u_int8_t dccph_doff; 31162017Ssam u_int8_t dccph_ccval_cscov; 32162017Ssam u_int16_t dccph_checksum; 33162017Ssam union { 34162017Ssam u_int8_t dccph_xtr; 35162017Ssam u_int32_t dccph_seq; 36162017Ssam } dccph_xtrs; 37162017Ssam}; 38162017Ssam 39162017Ssam#define DCCPH_CCVAL(dh) (((dh)->dccph_ccval_cscov) & 0x0F) 40162017Ssam#define DCCPH_CSCOV(dh) (((dh)->dccph_ccval_cscov >> 4) & 0x0F) 41162017Ssam 42162017Ssam#define DCCPH_X(dh) ((dh)->dccph_xtrs.dccph_xtr & 1) 43162017Ssam#define DCCPH_TYPE(dh) (((dh)->dccph_xtrs.dccph_xtr >> 1) & 0xF) 44162017Ssam#define DCCPH_SEQ(dh) (((dh)->dccph_xtrs.dccph_seq) >> 8) 45162017Ssam 46162017Ssam/** 47162017Ssam * struct dccp_hdr_ext - the low bits of a 48 bit seq packet 48162017Ssam * 49162017Ssam * @dccph_seq_low - low 24 bits of a 48 bit seq packet 50162017Ssam */ 51162017Ssamstruct dccp_hdr_ext { 52162017Ssam u_int32_t dccph_seq_low; 53162017Ssam}; 54162017Ssam 55162017Ssam/** 56162017Ssam * struct dccp_hdr_request - Conection initiation request header 57162017Ssam * 58162017Ssam * @dccph_req_service - Service to which the client app wants to connect 59162017Ssam */ 60162017Ssamstruct dccp_hdr_request { 61162017Ssam u_int32_t dccph_req_service; 62162017Ssam}; 63162017Ssam 64162017Ssam/** 65162017Ssam * struct dccp_hdr_ack_bits - acknowledgment bits common to most packets 66162017Ssam * 67162017Ssam * @dccph_resp_ack_nr_high - 48 bit ack number high order bits, contains GSR 68162017Ssam * @dccph_resp_ack_nr_low - 48 bit ack number low order bits, contains GSR 69162017Ssam */ 70162017Ssamstruct dccp_hdr_ack_bits { 71162017Ssam u_int32_t dccph_ra; 72162017Ssam u_int32_t dccph_ack_nr_low; 73162017Ssam}; 74162017Ssam 75162017Ssam#define DCCPH_ACK(dh_ack) ((dh_ack)->dccph_ra >> 8) 76162017Ssam 77162017Ssam/** 78162017Ssam * struct dccp_hdr_response - Conection initiation response header 79162017Ssam * 80162017Ssam * @dccph_resp_ack_nr_high - 48 bit ack number high order bits, contains GSR 81162017Ssam * @dccph_resp_ack_nr_low - 48 bit ack number low order bits, contains GSR 82162017Ssam * @dccph_resp_service - Echoes the Service Code on a received DCCP-Request 83162017Ssam */ 84162017Ssamstruct dccp_hdr_response { 85162017Ssam struct dccp_hdr_ack_bits dccph_resp_ack; 86162017Ssam u_int32_t dccph_resp_service; 87162017Ssam}; 88162017Ssam 89162017Ssamstatic inline struct dccp_hdr_data *dccp_hdr_data(struct dccp_hdr *hdrg) 90162017Ssam{ 91162017Ssam const int ext = DCCPH_X(hdrg) ? sizeof(struct dccp_hdr_ext) : 0; 92162017Ssam 93162017Ssam return (struct dccp_hdr_data *)(((u_char *)hdrg) + sizeof(hdrg) + ext); 94162017Ssam} 95162017Ssam 96162017Ssam/** 97162017Ssam * struct dccp_hdr_reset - Unconditionally shut down a connection 98162017Ssam * 99162017Ssam * @dccph_reset_service - Echoes the Service Code on a received DCCP-Request 100162017Ssam */ 101162017Ssamstruct dccp_hdr_reset { 102162017Ssam struct dccp_hdr_ack_bits dccph_reset_ack; 103162017Ssam u_int8_t dccph_reset_code, 104162017Ssam dccph_reset_data[3]; 105162017Ssam}; 106162017Ssam 107162017Ssamenum dccp_pkt_type { 108162017Ssam DCCP_PKT_REQUEST = 0, 109162017Ssam DCCP_PKT_RESPONSE, 110162017Ssam DCCP_PKT_DATA, 111162017Ssam DCCP_PKT_ACK, 112162017Ssam DCCP_PKT_DATAACK, 113162017Ssam DCCP_PKT_CLOSEREQ, 114162017Ssam DCCP_PKT_CLOSE, 115162017Ssam DCCP_PKT_RESET, 116162017Ssam DCCP_PKT_SYNC, 117162017Ssam DCCP_PKT_SYNCACK, 118162017Ssam DCCP_PKT_INVALID, 119162017Ssam}; 120162017Ssam 121162017Ssamenum dccp_reset_codes { 122162017Ssam DCCP_RESET_CODE_UNSPECIFIED = 0, 123162017Ssam DCCP_RESET_CODE_CLOSED, 124162017Ssam DCCP_RESET_CODE_ABORTED, 125162017Ssam DCCP_RESET_CODE_NO_CONNECTION, 126162017Ssam DCCP_RESET_CODE_PACKET_ERROR, 127162017Ssam DCCP_RESET_CODE_OPTION_ERROR, 128162017Ssam DCCP_RESET_CODE_MANDATORY_ERROR, 129162017Ssam DCCP_RESET_CODE_CONNECTION_REFUSED, 130162017Ssam DCCP_RESET_CODE_BAD_SERVICE_CODE, 131162017Ssam DCCP_RESET_CODE_TOO_BUSY, 132162017Ssam DCCP_RESET_CODE_BAD_INIT_COOKIE, 133162017Ssam DCCP_RESET_CODE_AGGRESSION_PENALTY, 134162017Ssam __DCCP_RESET_CODE_LAST, 135162017Ssam}; 136162017Ssam 137162017Ssam#endif /* __DCCP_HDR__ */ 138