contrib/tcpdump-3.9/dccp.h

   1 /* @(#) $Header: /tcpdump/master/tcpdump/dccp.h,v 1.1.2.4 2006/05/12 01:46:17 guy Exp $ (LBL) */
   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
  39 #define DCCPH_CCVAL(dh) (((dh)->dccph_ccval_cscov) & 0x0F)
  40 #define DCCPH_CSCOV(dh) (((dh)->dccph_ccval_cscov >> 4) & 0x0F)
  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__ */