epan/dissectors/packet-hyperscsi.c

   1 /* packet-hyperscsi.c
   2  * Routines for dissassembly of the Hyper SCSI protocol.
   3  *
   4  * $Id$
   5  *
   6  * Wireshark - Network traffic analyzer
   7  * By Gerald Combs <gerald@wireshark.org>
   8  * Copyright 1998 Gerald Combs
   9  * Copyright 2002 Richard Sharpe <rsharpe@richardsharpe.com>
  10  *
  11  * This program is free software; you can redistribute it and/or
  12  * modify it under the terms of the GNU General Public License
  13  * as published by the Free Software Foundation; either version 2
  14  * of the License, or (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  24  */
  25
  26 #include "config.h"
  27
  28 #include <glib.h>
  29
  30 #include <epan/packet.h>
  31
  32 static int proto_hyperscsi;
  33
  34 static int hf_hs_cmd = -1;
  35 static int hf_hs_ver = -1;
  36 static int hf_hs_res = -1;
  37 static int hf_hs_tagno = -1;
  38 static int hf_hs_lastfrag = -1;
  39 static int hf_hs_fragno = -1;
  40
  41 static gint ett_hyperscsi = -1;
  42 static gint ett_hs_hdr = -1;
  43 static gint ett_hs_pdu = -1;
  44
  45 static const true_false_string tfs_lastfrag = {
  46   "Last Fragment",
  47   "Not Last Fragment"
  48 };
  49
  50 #define HSCSI_OPCODE_REQUEST                  0x00
  51 #define HSCSI_OPCODE_REPLY                    0x01
  52 #define HSCSI_OPCODE_DEV_DISCOVERY            0x10
  53 #define HSCSI_OPCODE_ADN_REQUEST              0x11
  54 #define HSCSI_OPCODE_ADN_REPLY                0x12
  55 #define HSCSI_OPCODE_DISCONNECT               0x13
  56 #define HSCSI_OPCODE_ACK_SNR                  0x20
  57 #define HSCSI_OPCODE_ACK_REPLY                0x21
  58 #define HSCSI_OPCODE_ADDR_REPORT              0x30
  59 #define HSCSI_OPCODE_ADDR_REPLY               0x31
  60 #define HSCSI_OPCODE_LOCAL_REQUEST            0x32
  61 #define HSCSI_OPCODE_LOCAL_REPLY              0x33
  62 #define HSCSI_OPCODE_REMOTE_REQUEST           0x34
  63 #define HSCSI_OPCODE_REMOTE_REPLY             0x35
  64
  65 static const value_string hscsi_opcodes[] = {
  66   { HSCSI_OPCODE_REQUEST,         "Command Block Encap Request"},
  67   { HSCSI_OPCODE_REPLY,           "Command Block Encap Reply"},
  68   { HSCSI_OPCODE_DEV_DISCOVERY,   "Device Discovery Reply"},
  69   { HSCSI_OPCODE_ADN_REQUEST,     "Auth/Device Neg Request"},
  70   { HSCSI_OPCODE_ADN_REPLY,       "Auth/Device Neg Reply"},
  71   { HSCSI_OPCODE_DISCONNECT,      "Disconnect Request"},
  72   { HSCSI_OPCODE_ACK_SNR,         "Flow Control Setup/Ack Request"},
  73   { HSCSI_OPCODE_ACK_REPLY,       "Flow Control Ack Reply"},
  74   { 0, NULL}
  75 };
  76
  77 #define OPCODE_MASK 0x7F
  78
  79 static void
  80 dissect_hyperscsi(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
  81 {
  82   guint      hs_hdr1, hs_hdr2, hs_hdr3;
  83   guint8     hs_res;
  84   guint16    hs_tagno;
  85   guint16    hs_fragno;
  86   gint       offset = 0;
  87   proto_tree *hs_hdr_tree, *hs_pdu_tree;
  88   proto_tree *hs_tree = NULL;
  89   proto_item *ti;
  90   guint8     hs_cmd, hs_ver;
  91
  92   col_set_str(pinfo->cinfo, COL_PROTOCOL, "HyperSCSI");
  93   col_clear(pinfo->cinfo, COL_INFO);
  94
  95   if (tree) {
  96     ti = proto_tree_add_item(tree, proto_hyperscsi, tvb, offset, -1, ENC_NA);
  97     hs_tree = proto_item_add_subtree(ti, ett_hyperscsi);
  98   }
  99
 100   hs_hdr1 = tvb_get_guint8(tvb, offset);
 101   offset++;
 102   hs_hdr2 = tvb_get_guint8(tvb, offset);
 103   offset++;
 104   hs_hdr3 = tvb_get_guint8(tvb, offset);
 105   offset++;
 106
 107   hs_res = hs_hdr1 >> 4;
 108   hs_tagno = ((hs_hdr1 & 0x0F) << 5 ) | (hs_hdr2 >> 3);
 109   hs_fragno = ((hs_hdr2 &0X03) << 8 ) | hs_hdr3;
 110
 111   /*
 112    * Add the header ... three bytes
 113    */
 114
 115   if (tree) {
 116     ti = proto_tree_add_text(hs_tree, tvb, 0, 3, "HyperSCSI Header");
 117     hs_hdr_tree = proto_item_add_subtree(ti, ett_hs_hdr);
 118
 119     /*
 120      * Now, add the header items
 121      */
 122
 123     proto_tree_add_uint(hs_hdr_tree, hf_hs_res, tvb, 0, 1, hs_res);
 124     proto_tree_add_uint(hs_hdr_tree, hf_hs_tagno, tvb, 0, 2, hs_tagno);
 125     proto_tree_add_item(hs_hdr_tree, hf_hs_lastfrag, tvb, 1, 1, ENC_BIG_ENDIAN);
 126     proto_tree_add_uint(hs_hdr_tree, hf_hs_fragno, tvb, 1, 2, hs_fragno);
 127
 128   }
 129
 130   /*
 131    * Now, add the PDU
 132    */
 133
 134   hs_ver = tvb_get_guint8(tvb, offset++);
 135
 136   hs_cmd = tvb_get_guint8(tvb, offset);
 137
 138   hs_cmd &= OPCODE_MASK;
 139
 140   col_append_str(pinfo->cinfo, COL_INFO,
 141                    val_to_str(hs_cmd, hscsi_opcodes, "Unknown HyperSCSI Request or Response (%u)"));
 142
 143   if (tree) {
 144     ti = proto_tree_add_text(hs_tree, tvb, 3, -1, "HyperSCSI PDU");
 145     hs_pdu_tree = proto_item_add_subtree(ti, ett_hs_pdu);
 146
 147     proto_tree_add_uint(hs_pdu_tree, hf_hs_ver, tvb, 3, 1, hs_ver);
 148
 149     proto_tree_add_uint(hs_pdu_tree, hf_hs_cmd, tvb, 4, 1, hs_cmd);
 150   }
 151
 152 }
 153
 154 void
 155 proto_register_hyperscsi(void)
 156 {
 157
 158   static hf_register_info hf[] = {
 159     { &hf_hs_res,
 160       { "Reserved", "hyperscsi.reserved", FT_UINT8, BASE_DEC, NULL, 0x0,
 161         NULL, HFILL}},
 162
 163     { &hf_hs_tagno,
 164       { "Tag No", "hyperscsi.tagno", FT_UINT16, BASE_DEC, NULL, 0x0,
 165         NULL, HFILL }},
 166
 167     { &hf_hs_lastfrag,
 168       { "Last Fragment", "hyperscsi.lastfrag", FT_BOOLEAN, 8, TFS(&tfs_lastfrag), 0x04, NULL, HFILL}},
 169
 170     { &hf_hs_fragno,
 171       { "Fragment No", "hyperscsi.fragno", FT_UINT16, BASE_DEC, NULL, 0x0,
 172         NULL, HFILL}},
 173
 174     { &hf_hs_ver,
 175       { "HyperSCSI Version", "hyperscsi.version", FT_UINT8, BASE_DEC, NULL,
 176         0x0, NULL, HFILL}},
 177
 178     { &hf_hs_cmd,
 179       { "HyperSCSI Command", "hyperscsi.cmd", FT_UINT8, BASE_DEC, VALS(hscsi_opcodes), 0x0,
 180         NULL, HFILL}},
 181   };
 182
 183   static gint *ett[] = {
 184     &ett_hyperscsi,
 185     &ett_hs_hdr,
 186     &ett_hs_pdu,
 187   };
 188
 189   proto_hyperscsi = proto_register_protocol("HyperSCSI", "HyperSCSI", "hyperscsi");
 190   proto_register_field_array(proto_hyperscsi, hf, array_length(hf));
 191   proto_register_subtree_array(ett, array_length(ett));
 192
 193   register_dissector("hyperscsi", dissect_hyperscsi, proto_hyperscsi);
 194 }
 195
 196 #define ETHERTYPE_HYPERSCSI 0x889A
 197
 198 void
 199 proto_reg_handoff_hyperscsi(void)
 200 {
 201   dissector_handle_t hs_handle;
 202
 203   hs_handle = find_dissector("hyperscsi");
 204   dissector_add_uint("ethertype", ETHERTYPE_HYPERSCSI, hs_handle);
 205
 206 }