dist/tcpdump/dccp.h

   1 /*      $NetBSD$        */
   2
   3 /* @(#) Header: /tcpdump/master/tcpdump/dccp.h,v 1.1.2.4 2006/05/12 01:46:17 guy Exp (LBL) */
   4 /*
   5  * Copyright (C) Arnaldo Carvalho de Melo 2004
   6  * Copyright (C) Ian McDonald 2005 <iam4@cs.waikato.ac.nz>
   7  * Copyright (C) Yoshifumi Nishida 2005
   8  *
   9  * This software may be distributed either under the terms of the
  10  * BSD-style license that accompanies tcpdump or the GNU GPL version 2
  11  */
  12
  13 #ifndef __DCCP_HDR__
  14 #define __DCCP_HDR__
  15
  16 /**
  17  * struct dccp_hdr - generic part of DCCP packet header
  18  *
  19  * @dccph_sport - Relevant port on the endpoint that sent this packet
  20  * @dccph_dport - Relevant port on the other endpoint
  21  * @dccph_doff - Data Offset from the start of the DCCP header, in 32-bit words
  22  * @dccph_ccval - Used by the HC-Sender CCID
  23  * @dccph_cscov - Parts of the packet that are covered by the Checksum field
  24  * @dccph_checksum - Internet checksum, depends on dccph_cscov
  25  * @dccph_x - 0 = 24 bit sequence number, 1 = 48
  26  * @dccph_type - packet type, see DCCP_PKT_ prefixed macros
  27  * @dccph_seq - sequence number high or low order 24 bits, depends on dccph_x
  28  */
  29 struct dccp_hdr {
  30         u_int16_t       dccph_sport,
  31                         dccph_dport;
  32         u_int8_t        dccph_doff;
  33         u_int8_t        dccph_ccval_cscov;
  34         u_int16_t       dccph_checksum;
  35         union {
  36         u_int8_t        dccph_xtr;
  37         u_int32_t       dccph_seq;
  38         }               dccph_xtrs;
  39 };
  40
  41 #define DCCPH_CCVAL(dh) (((dh)->dccph_ccval_cscov) & 0x0F)
  42 #define DCCPH_CSCOV(dh) (((dh)->dccph_ccval_cscov >> 4) & 0x0F)
  43
  44 #define DCCPH_X(dh)     ((dh)->dccph_xtrs.dccph_xtr & 1)
  45 #define DCCPH_TYPE(dh)  (((dh)->dccph_xtrs.dccph_xtr >> 1) & 0xF)
  46 #define DCCPH_SEQ(dh)   (((dh)->dccph_xtrs.dccph_seq) >> 8)
  47
  48 /**
  49  * struct dccp_hdr_ext - the low bits of a 48 bit seq packet
  50  *
  51  * @dccph_seq_low - low 24 bits of a 48 bit seq packet
  52  */
  53 struct dccp_hdr_ext {
  54         u_int32_t       dccph_seq_low;
  55 };
  56
  57 /**
  58  * struct dccp_hdr_request - Conection initiation request header
  59  *
  60  * @dccph_req_service - Service to which the client app wants to connect
  61  */
  62 struct dccp_hdr_request {
  63         u_int32_t       dccph_req_service;
  64 };
  65
  66 /**
  67  * struct dccp_hdr_ack_bits - acknowledgment bits common to most packets
  68  *
  69  * @dccph_resp_ack_nr_high - 48 bit ack number high order bits, contains GSR
  70  * @dccph_resp_ack_nr_low - 48 bit ack number low order bits, contains GSR
  71  */
  72 struct dccp_hdr_ack_bits {
  73         u_int32_t       dccph_ra;
  74         u_int32_t       dccph_ack_nr_low;
  75 };
  76
  77 #define DCCPH_ACK(dh_ack)   ((dh_ack)->dccph_ra >> 8)
  78
  79 /**
  80  * struct dccp_hdr_response - Conection initiation response header
  81  *
  82  * @dccph_resp_ack_nr_high - 48 bit ack number high order bits, contains GSR
  83  * @dccph_resp_ack_nr_low - 48 bit ack number low order bits, contains GSR
  84  * @dccph_resp_service - Echoes the Service Code on a received DCCP-Request
  85  */
  86 struct dccp_hdr_response {
  87         struct dccp_hdr_ack_bits        dccph_resp_ack;
  88         u_int32_t                       dccph_resp_service;
  89 };
  90
  91 #if 0
  92 static inline struct dccp_hdr_data *dccp_hdr_data(struct dccp_hdr *hdrg)
  93 {
  94         const int ext = DCCPH_X(hdrg) ? sizeof(struct dccp_hdr_ext) : 0;
  95
  96         return (struct dccp_hdr_data *)(((u_char *)hdrg) + sizeof(hdrg) + ext);
  97 }
  98 #endif
  99
 100 /**
 101  * struct dccp_hdr_reset - Unconditionally shut down a connection
 102  *
 103  * @dccph_reset_service - Echoes the Service Code on a received DCCP-Request
 104  */
 105 struct dccp_hdr_reset {
 106         struct dccp_hdr_ack_bits        dccph_reset_ack;
 107         u_int8_t                        dccph_reset_code,
 108                                         dccph_reset_data[3];
 109 };
 110
 111 enum dccp_pkt_type {
 112         DCCP_PKT_REQUEST = 0,
 113         DCCP_PKT_RESPONSE,
 114         DCCP_PKT_DATA,
 115         DCCP_PKT_ACK,
 116         DCCP_PKT_DATAACK,
 117         DCCP_PKT_CLOSEREQ,
 118         DCCP_PKT_CLOSE,
 119         DCCP_PKT_RESET,
 120         DCCP_PKT_SYNC,
 121         DCCP_PKT_SYNCACK,
 122         DCCP_PKT_INVALID
 123 };
 124
 125 enum dccp_reset_codes {
 126         DCCP_RESET_CODE_UNSPECIFIED = 0,
 127         DCCP_RESET_CODE_CLOSED,
 128         DCCP_RESET_CODE_ABORTED,
 129         DCCP_RESET_CODE_NO_CONNECTION,
 130         DCCP_RESET_CODE_PACKET_ERROR,
 131         DCCP_RESET_CODE_OPTION_ERROR,
 132         DCCP_RESET_CODE_MANDATORY_ERROR,
 133         DCCP_RESET_CODE_CONNECTION_REFUSED,
 134         DCCP_RESET_CODE_BAD_SERVICE_CODE,
 135         DCCP_RESET_CODE_TOO_BUSY,
 136         DCCP_RESET_CODE_BAD_INIT_COOKIE,
 137         DCCP_RESET_CODE_AGGRESSION_PENALTY,
 138         __DCCP_RESET_CODE_LAST
 139 };
 140
 141 #endif /* __DCCP_HDR__ */