| /* @(#) $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 0 |
| 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); |
| } |
| #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__ */ |