JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 1 | /* @(#) $Header: /tcpdump/master/tcpdump/dccp.h,v 1.5 2006-11-02 09:05:23 hannes Exp $ (LBL) */ |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 2 | /* |
| 3 | * Copyright (C) Arnaldo Carvalho de Melo 2004 |
| 4 | * Copyright (C) Ian McDonald 2005 <iam4@cs.waikato.ac.nz> |
| 5 | * Copyright (C) Yoshifumi Nishida 2005 |
| 6 | * |
| 7 | * This software may be distributed either under the terms of the |
| 8 | * BSD-style license that accompanies tcpdump or the GNU GPL version 2 |
| 9 | */ |
| 10 | |
| 11 | #ifndef __DCCP_HDR__ |
| 12 | #define __DCCP_HDR__ |
| 13 | |
| 14 | /** |
| 15 | * struct dccp_hdr - generic part of DCCP packet header |
| 16 | * |
| 17 | * @dccph_sport - Relevant port on the endpoint that sent this packet |
| 18 | * @dccph_dport - Relevant port on the other endpoint |
| 19 | * @dccph_doff - Data Offset from the start of the DCCP header, in 32-bit words |
| 20 | * @dccph_ccval - Used by the HC-Sender CCID |
| 21 | * @dccph_cscov - Parts of the packet that are covered by the Checksum field |
| 22 | * @dccph_checksum - Internet checksum, depends on dccph_cscov |
| 23 | * @dccph_x - 0 = 24 bit sequence number, 1 = 48 |
| 24 | * @dccph_type - packet type, see DCCP_PKT_ prefixed macros |
| 25 | * @dccph_seq - sequence number high or low order 24 bits, depends on dccph_x |
| 26 | */ |
| 27 | struct dccp_hdr { |
| 28 | u_int16_t dccph_sport, |
| 29 | dccph_dport; |
| 30 | u_int8_t dccph_doff; |
| 31 | u_int8_t dccph_ccval_cscov; |
| 32 | u_int16_t dccph_checksum; |
| 33 | union { |
| 34 | u_int8_t dccph_xtr; |
| 35 | u_int32_t dccph_seq; |
| 36 | } dccph_xtrs; |
| 37 | }; |
| 38 | |
JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 39 | #define DCCPH_CCVAL(dh) (((dh)->dccph_ccval_cscov >> 4) & 0xF) |
| 40 | #define DCCPH_CSCOV(dh) (((dh)->dccph_ccval_cscov) & 0xF) |
The Android Open Source Project | 2949f58 | 2009-03-03 19:30:46 -0800 | [diff] [blame] | 41 | |
| 42 | #define DCCPH_X(dh) ((dh)->dccph_xtrs.dccph_xtr & 1) |
| 43 | #define DCCPH_TYPE(dh) (((dh)->dccph_xtrs.dccph_xtr >> 1) & 0xF) |
| 44 | #define DCCPH_SEQ(dh) (((dh)->dccph_xtrs.dccph_seq) >> 8) |
| 45 | |
| 46 | /** |
| 47 | * struct dccp_hdr_ext - the low bits of a 48 bit seq packet |
| 48 | * |
| 49 | * @dccph_seq_low - low 24 bits of a 48 bit seq packet |
| 50 | */ |
| 51 | struct dccp_hdr_ext { |
| 52 | u_int32_t dccph_seq_low; |
| 53 | }; |
| 54 | |
| 55 | /** |
| 56 | * struct dccp_hdr_request - Conection initiation request header |
| 57 | * |
| 58 | * @dccph_req_service - Service to which the client app wants to connect |
| 59 | */ |
| 60 | struct dccp_hdr_request { |
| 61 | u_int32_t dccph_req_service; |
| 62 | }; |
| 63 | |
| 64 | /** |
| 65 | * struct dccp_hdr_ack_bits - acknowledgment bits common to most packets |
| 66 | * |
| 67 | * @dccph_resp_ack_nr_high - 48 bit ack number high order bits, contains GSR |
| 68 | * @dccph_resp_ack_nr_low - 48 bit ack number low order bits, contains GSR |
| 69 | */ |
| 70 | struct dccp_hdr_ack_bits { |
| 71 | u_int32_t dccph_ra; |
| 72 | u_int32_t dccph_ack_nr_low; |
| 73 | }; |
| 74 | |
| 75 | #define DCCPH_ACK(dh_ack) ((dh_ack)->dccph_ra >> 8) |
| 76 | |
| 77 | /** |
| 78 | * struct dccp_hdr_response - Conection initiation response header |
| 79 | * |
| 80 | * @dccph_resp_ack_nr_high - 48 bit ack number high order bits, contains GSR |
| 81 | * @dccph_resp_ack_nr_low - 48 bit ack number low order bits, contains GSR |
| 82 | * @dccph_resp_service - Echoes the Service Code on a received DCCP-Request |
| 83 | */ |
| 84 | struct dccp_hdr_response { |
| 85 | struct dccp_hdr_ack_bits dccph_resp_ack; |
| 86 | u_int32_t dccph_resp_service; |
| 87 | }; |
| 88 | |
| 89 | #if 0 |
| 90 | static inline struct dccp_hdr_data *dccp_hdr_data(struct dccp_hdr *hdrg) |
| 91 | { |
| 92 | const int ext = DCCPH_X(hdrg) ? sizeof(struct dccp_hdr_ext) : 0; |
| 93 | |
| 94 | return (struct dccp_hdr_data *)(((u_char *)hdrg) + sizeof(hdrg) + ext); |
| 95 | } |
| 96 | #endif |
| 97 | |
| 98 | /** |
| 99 | * struct dccp_hdr_reset - Unconditionally shut down a connection |
| 100 | * |
| 101 | * @dccph_reset_service - Echoes the Service Code on a received DCCP-Request |
| 102 | */ |
| 103 | struct dccp_hdr_reset { |
| 104 | struct dccp_hdr_ack_bits dccph_reset_ack; |
| 105 | u_int8_t dccph_reset_code, |
| 106 | dccph_reset_data[3]; |
| 107 | }; |
| 108 | |
| 109 | enum dccp_pkt_type { |
| 110 | DCCP_PKT_REQUEST = 0, |
| 111 | DCCP_PKT_RESPONSE, |
| 112 | DCCP_PKT_DATA, |
| 113 | DCCP_PKT_ACK, |
| 114 | DCCP_PKT_DATAACK, |
| 115 | DCCP_PKT_CLOSEREQ, |
| 116 | DCCP_PKT_CLOSE, |
| 117 | DCCP_PKT_RESET, |
| 118 | DCCP_PKT_SYNC, |
| 119 | DCCP_PKT_SYNCACK, |
| 120 | DCCP_PKT_INVALID |
| 121 | }; |
| 122 | |
| 123 | enum dccp_reset_codes { |
| 124 | DCCP_RESET_CODE_UNSPECIFIED = 0, |
| 125 | DCCP_RESET_CODE_CLOSED, |
| 126 | DCCP_RESET_CODE_ABORTED, |
| 127 | DCCP_RESET_CODE_NO_CONNECTION, |
| 128 | DCCP_RESET_CODE_PACKET_ERROR, |
| 129 | DCCP_RESET_CODE_OPTION_ERROR, |
| 130 | DCCP_RESET_CODE_MANDATORY_ERROR, |
| 131 | DCCP_RESET_CODE_CONNECTION_REFUSED, |
| 132 | DCCP_RESET_CODE_BAD_SERVICE_CODE, |
| 133 | DCCP_RESET_CODE_TOO_BUSY, |
| 134 | DCCP_RESET_CODE_BAD_INIT_COOKIE, |
| 135 | DCCP_RESET_CODE_AGGRESSION_PENALTY, |
| 136 | __DCCP_RESET_CODE_LAST |
| 137 | }; |
| 138 | |
| 139 | #endif /* __DCCP_HDR__ */ |