/* @(#) $Header: /tcpdump/master/tcpdump/dccp.h,v 1.1.2.2 2005/09/20 06:25:45 guy Exp $ (LBL) */ /* * Copyright (C) Arnaldo Carvalho de Melo 2004 * Copyright (C) Ian McDonald 2005 * 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) & 0x0F) #define DCCPH_CSCOV(dh) (((dh)->dccph_ccval_cscov >> 4) & 0x0F) #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; }; static 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); } /** * 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__ */