Ethereal-dev: [Ethereal-dev] iSCSI desegmentation woes
Note: This archive is from the project's previous web site, ethereal.com. This list is no longer active.
From: Mark Burton <markb@xxxxxxxxxx>
Date: Sat, 20 Oct 2001 19:40:11 +0100 (BST)
Guy, World, I am having problems with iSCSI desegmentation. Sequences of packets that should be coalesced are not and I don't understand what's going wrong. If you have time, try using the enclosed packet-iscsi.c on the enclosed pcap file. Cheers, Mark
/* packet-iscsi.c
* Routines for iSCSI dissection
* Copyright 2001, Eurologic and Mark Burton <markb@xxxxxxxxxx>
*
* Conforms to the protocol described in: draft-ietf-ips-iscsi-08.txt
*
* $Id: packet-iscsi.c,v 1.11 2001/10/19 20:53:14 guy Exp $
*
* Ethereal - Network traffic analyzer
* By Gerald Combs <gerald@xxxxxxxxxxxx>
* Copyright 1998 Gerald Combs
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#ifdef HAVE_SYS_TYPES_H
# include <sys/types.h>
#endif
#ifdef HAVE_NETINET_IN_H
# include <netinet/in.h>
#endif
#include <glib.h>
#ifdef NEED_SNPRINTF_H
# include "snprintf.h"
#endif
#include "packet.h"
#include "prefs.h"
static uint iscsi_desegment = TRUE;
static int enable_bogosity_filter = TRUE;
static guint32 bogus_pdu_data_length_threshold = 256 * 1024;
static int enableDataDigests = FALSE;
static int enableHeaderDigests = FALSE;
static int dataDigestIsCRC32 = TRUE;
static int headerDigestIsCRC32 = TRUE;
static int dataDigestSize = 4;
static int headerDigestSize = 4;
static uint iscsi_port = 5003;
/* Initialize the protocol and registered fields */
static int proto_iscsi = -1;
static int hf_iscsi_Padding = -1;
static int hf_iscsi_ping_data = -1;
static int hf_iscsi_immediate_data = -1;
static int hf_iscsi_sense_data = -1;
static int hf_iscsi_write_data = -1;
static int hf_iscsi_read_data = -1;
static int hf_iscsi_error_pdu_data = -1;
static int hf_iscsi_Opcode = -1;
static int hf_iscsi_Flags = -1;
static int hf_iscsi_HeaderDigest = -1;
static int hf_iscsi_HeaderDigest32 = -1;
static int hf_iscsi_DataDigest = -1;
static int hf_iscsi_DataDigest32 = -1;
static int hf_iscsi_X = -1;
static int hf_iscsi_I = -1;
static int hf_iscsi_SCSICommand_F = -1;
static int hf_iscsi_SCSICommand_R = -1;
static int hf_iscsi_SCSICommand_W = -1;
static int hf_iscsi_SCSICommand_Attr = -1;
static int hf_iscsi_SCSICommand_CRN = -1;
static int hf_iscsi_SCSICommand_AddCDB = -1;
static int hf_iscsi_DataSegmentLength = -1;
static int hf_iscsi_TotalAHSLength = -1;
static int hf_iscsi_LUN = -1;
static int hf_iscsi_InitiatorTaskTag = -1;
static int hf_iscsi_ExpectedDataTransferLength = -1;
static int hf_iscsi_CmdSN = -1;
static int hf_iscsi_ExpStatSN = -1;
static int hf_iscsi_SCSICommand_CDB = -1;
static int hf_iscsi_SCSICommand_CDB0 = -1;
static int hf_iscsi_StatSN = -1;
static int hf_iscsi_ExpCmdSN = -1;
static int hf_iscsi_MaxCmdSN = -1;
static int hf_iscsi_SCSIResponse_o = -1;
static int hf_iscsi_SCSIResponse_u = -1;
static int hf_iscsi_SCSIResponse_O = -1;
static int hf_iscsi_SCSIResponse_U = -1;
static int hf_iscsi_SCSIResponse_BidiReadResidualCount = -1;
static int hf_iscsi_SCSIResponse_ResidualCount = -1;
static int hf_iscsi_SCSIResponse_Response = -1;
static int hf_iscsi_SCSIResponse_Status = -1;
static int hf_iscsi_SCSIData_F = -1;
static int hf_iscsi_SCSIData_S = -1;
static int hf_iscsi_SCSIData_O = -1;
static int hf_iscsi_SCSIData_U = -1;
static int hf_iscsi_TargetTransferTag = -1;
static int hf_iscsi_DataSN = -1;
static int hf_iscsi_BufferOffset = -1;
static int hf_iscsi_SCSIData_ResidualCount = -1;
static int hf_iscsi_VersionMin = -1;
static int hf_iscsi_VersionMax = -1;
static int hf_iscsi_VersionActive = -1;
static int hf_iscsi_CID = -1;
static int hf_iscsi_ISID = -1;
static int hf_iscsi_TSID = -1;
static int hf_iscsi_InitStatSN = -1;
static int hf_iscsi_InitCmdSN = -1;
static int hf_iscsi_Login_T = -1;
static int hf_iscsi_Login_CSG = -1;
static int hf_iscsi_Login_NSG = -1;
static int hf_iscsi_Login_Stage = -1;
static int hf_iscsi_Login_Status = -1;
static int hf_iscsi_KeyValue = -1;
static int hf_iscsi_Text_F = -1;
static int hf_iscsi_ExpDataSN = -1;
static int hf_iscsi_R2TSN = -1;
static int hf_iscsi_SCSITask_ReferencedTaskTag = -1;
static int hf_iscsi_RefCmdSN = -1;
static int hf_iscsi_SCSITask_Function = -1;
static int hf_iscsi_SCSITask_Response = -1;
static int hf_iscsi_Logout_Reason = -1;
static int hf_iscsi_Logout_Response = -1;
static int hf_iscsi_Time2Wait = -1;
static int hf_iscsi_Time2Retain = -1;
static int hf_iscsi_DesiredDataLength = -1;
static int hf_iscsi_AsyncEvent = -1;
static int hf_iscsi_EventVendorCode = -1;
static int hf_iscsi_Parameter1 = -1;
static int hf_iscsi_Parameter2 = -1;
static int hf_iscsi_Parameter3 = -1;
static int hf_iscsi_Reject_Reason = -1;
static int hf_iscsi_snack_type = -1;
static int hf_iscsi_BegRun = -1;
static int hf_iscsi_RunLength = -1;
/* Initialize the subtree pointers */
static gint ett_iscsi_KeyValues = -1;
static gint ett_iscsi_CDB = -1;
static gint ett_iscsi_Flags = -1;
#define X_BIT 0x80
#define I_BIT 0x40
#define TARGET_OPCODE_BIT 0x20
#define ISCSI_OPCODE_NOP_OUT 0x00
#define ISCSI_OPCODE_SCSI_COMMAND 0x01
#define ISCSI_OPCODE_SCSI_TASK_MANAGEMENT_COMMAND 0x02
#define ISCSI_OPCODE_LOGIN_COMMAND 0x03
#define ISCSI_OPCODE_TEXT_COMMAND 0x04
#define ISCSI_OPCODE_SCSI_DATA_OUT 0x05
#define ISCSI_OPCODE_LOGOUT_COMMAND 0x06
#define ISCSI_OPCODE_SNACK_REQUEST 0x10
#define ISCSI_OPCODE_NOP_IN (0x20 | X_BIT | I_BIT)
#define ISCSI_OPCODE_SCSI_RESPONSE (0x21 | X_BIT | I_BIT)
#define ISCSI_OPCODE_SCSI_TASK_MANAGEMENT_RESPONSE (0x22 | X_BIT | I_BIT)
#define ISCSI_OPCODE_LOGIN_RESPONSE (0x23 | X_BIT | I_BIT)
#define ISCSI_OPCODE_TEXT_RESPONSE (0x24 | X_BIT | I_BIT)
#define ISCSI_OPCODE_SCSI_DATA_IN (0x25 | X_BIT | I_BIT)
#define ISCSI_OPCODE_LOGOUT_RESPONSE (0x26 | X_BIT | I_BIT)
#define ISCSI_OPCODE_R2T (0x31 | X_BIT | I_BIT)
#define ISCSI_OPCODE_ASYNC_MESSAGE (0x32 | X_BIT | I_BIT)
#define ISCSI_OPCODE_REJECT (0x3f | X_BIT | I_BIT)
#define CSG_MASK 0x0c
static const value_string iscsi_opcodes[] = {
{ ISCSI_OPCODE_NOP_OUT, "NOP Out" },
{ ISCSI_OPCODE_SCSI_COMMAND, "SCSI Command" },
{ ISCSI_OPCODE_SCSI_TASK_MANAGEMENT_COMMAND, "SCSI Task Management Command" },
{ ISCSI_OPCODE_LOGIN_COMMAND, "Login Command" },
{ ISCSI_OPCODE_TEXT_COMMAND, "Text Command" },
{ ISCSI_OPCODE_SCSI_DATA_OUT, "SCSI Write Data" },
{ ISCSI_OPCODE_LOGOUT_COMMAND, "Logout Command" },
{ ISCSI_OPCODE_SNACK_REQUEST, "SNACK Request" },
{ ISCSI_OPCODE_NOP_IN, "NOP In" },
{ ISCSI_OPCODE_SCSI_RESPONSE, "SCSI Command Response" },
{ ISCSI_OPCODE_SCSI_TASK_MANAGEMENT_RESPONSE, "SCSI Task Management Response" },
{ ISCSI_OPCODE_LOGIN_RESPONSE, "Login Response" },
{ ISCSI_OPCODE_TEXT_RESPONSE, "Text Response" },
{ ISCSI_OPCODE_SCSI_DATA_IN, "SCSI Read Data" },
{ ISCSI_OPCODE_LOGOUT_RESPONSE, "Logout Response" },
{ ISCSI_OPCODE_R2T, "Ready To Transfer" },
{ ISCSI_OPCODE_ASYNC_MESSAGE, "Asynchronous Message" },
{ ISCSI_OPCODE_REJECT, "Reject"},
{0, NULL},
};
static const true_false_string iscsi_meaning_X = {
"Retry",
"Not retry"
};
static const true_false_string iscsi_meaning_I = {
"Immediate delivery",
"Queued delivery"
};
static const true_false_string iscsi_meaning_F = {
"Final PDU in sequence",
"Not final PDU in sequence"
};
static const true_false_string iscsi_meaning_T = {
"Transit to next login stage",
"Stay in current login stage"
};
static const true_false_string iscsi_meaning_S = {
"Response contains SCSI status",
"Response does not contain SCSI status"
};
static const true_false_string iscsi_meaning_R = {
"Data will be read from target",
"No data will be read from target"
};
static const true_false_string iscsi_meaning_W = {
"Data will be written to target",
"No data will be written to target"
};
static const true_false_string iscsi_meaning_o = {
"Read part of bi-directional command overflowed",
"No overflow of read part of bi-directional command",
};
static const true_false_string iscsi_meaning_u = {
"Read part of bi-directional command underflowed",
"No underflow of read part of bi-directional command",
};
static const true_false_string iscsi_meaning_O = {
"Residual overflow occurred",
"No residual overflow occurred",
};
static const true_false_string iscsi_meaning_U = {
"Residual underflow occurred",
"No residual underflow occurred",
};
static const value_string iscsi_scsi_responses[] = {
{ 0, "Command completed at target" },
{ 1, "Response does not contain SCSI status"},
{ 0, NULL }
};
static const value_string iscsi_scsicommand_taskattrs[] = {
{0, "Untagged"},
{1, "Simple"},
{2, "Ordered"},
{3, "Head of Queue"},
{4, "ACA"},
{0, NULL},
};
static const value_string iscsi_scsi_cdb0[] = {
{0x00, "TEST_UNIT_READY"},
{0x01, "REZERO_UNIT"},
{0x03, "REQUEST_SENSE"},
{0x04, "FORMAT_UNIT"},
{0x05, "READ_BLOCK_LIMITS"},
{0x07, "REASSIGN_BLOCKS"},
{0x08, "READ_6"},
{0x0a, "WRITE_6"},
{0x0b, "SEEK_6"},
{0x0f, "READ_REVERSE"},
{0x10, "WRITE_FILEMARKS"},
{0x11, "SPACE"},
{0x12, "INQUIRY"},
{0x14, "RECOVER_BUFFERED_DATA"},
{0x15, "MODE_SELECT"},
{0x16, "RESERVE"},
{0x17, "RELEASE"},
{0x18, "COPY"},
{0x19, "ERASE"},
{0x1a, "MODE_SENSE"},
{0x1b, "START_STOP"},
{0x1c, "RECEIVE_DIAGNOSTIC"},
{0x1d, "SEND_DIAGNOSTIC"},
{0x1e, "ALLOW_MEDIUM_REMOVAL"},
{0x24, "SET_WINDOW"},
{0x25, "READ_CAPACITY"},
{0x28, "READ_10"},
{0x2a, "WRITE_10"},
{0x2b, "SEEK_10"},
{0x2e, "WRITE_VERIFY"},
{0x2f, "VERIFY"},
{0x30, "SEARCH_HIGH"},
{0x31, "SEARCH_EQUAL"},
{0x32, "SEARCH_LOW"},
{0x33, "SET_LIMITS"},
{0x34, "PRE_FETCH"},
{0x34, "READ_POSITION"},
{0x35, "SYNCHRONIZE_CACHE"},
{0x36, "LOCK_UNLOCK_CACHE"},
{0x37, "READ_DEFECT_DATA"},
{0x38, "MEDIUM_SCAN"},
{0x39, "COMPARE"},
{0x3a, "COPY_VERIFY"},
{0x3b, "WRITE_BUFFER"},
{0x3c, "READ_BUFFER"},
{0x3d, "UPDATE_BLOCK"},
{0x3e, "READ_LONG"},
{0x3f, "WRITE_LONG"},
{0x40, "CHANGE_DEFINITION"},
{0x41, "WRITE_SAME"},
{0x43, "READ_TOC"},
{0x4c, "LOG_SELECT"},
{0x4d, "LOG_SENSE"},
{0x55, "MODE_SELECT_10"},
{0x5a, "MODE_SENSE_10"},
{0xa5, "MOVE_MEDIUM"},
{0xa8, "READ_12"},
{0xaa, "WRITE_12"},
{0xae, "WRITE_VERIFY_12"},
{0xb0, "SEARCH_HIGH_12"},
{0xb1, "SEARCH_EQUAL_12"},
{0xb2, "SEARCH_LOW_12"},
{0xb8, "READ_ELEMENT_STATUS"},
{0xb6, "SEND_VOLUME_TAG"},
{0xea, "WRITE_LONG_2"},
{0, NULL},
};
static const value_string iscsi_scsi_statuses[] = {
{0x00, "Good"},
{0x01, "Check condition"},
{0x02, "Condition good"},
{0x04, "Busy"},
{0x08, "Intermediate good"},
{0x0a, "Intermediate c good"},
{0x0c, "Reservation conflict"},
{0x11, "Command terminated"},
{0x14, "Queue full"},
{0, NULL},
};
static const value_string iscsi_task_responses[] = {
{0, "Function complete"},
{1, "Task not in task set"},
{2, "LUN does not exist"},
{255, "Function rejected"},
{0, NULL},
};
static const value_string iscsi_task_functions[] = {
{1, "Abort Task"},
{2, "Abort Task Set"},
{3, "Clear ACA"},
{4, "Clear Task Set"},
{5, "Logical Unit Reset"},
{6, "Target Warm Reset"},
{7, "Target Cold Reset"},
{0, NULL},
};
static const value_string iscsi_login_status[] = {
{0x0000, "Success"},
{0x0101, "Target moved temporarily"},
{0x0102, "Target moved permanently"},
{0x0200, "Initiator error (miscellaneous error)"},
{0x0201, "Athentication failed"},
{0x0202, "Authorisation failure"},
{0x0203, "Target not found"},
{0x0204, "Target removed"},
{0x0205, "Unsupported version"},
{0x0206, "Too many connections"},
{0x0207, "Missing parameter"},
{0x0208, "Can't include in session"},
{0x0209, "Session type not supported"},
{0x0300, "Target error (miscellaneous error)"},
{0x0301, "Service unavailable"},
{0x0302, "Out of resources"},
{0, NULL},
};
static const value_string iscsi_login_stage[] = {
{0, "Security negotiation"},
{1, "Operational negotiation"},
{3, "Full feature phase"},
{0, NULL},
};
static const value_string iscsi_logout_reasons[] = {
{0, "Close session"},
{1, "Close connection"},
{2, "Remove connection for recovery"},
{0, NULL},
};
static const value_string iscsi_logout_response[] = {
{0, "Connection closed successfully"},
{1, "CID not found"},
{2, "Connection recovery not supported"},
{3, "Cleanup failed for various reasons"},
{0, NULL},
};
static const value_string iscsi_asyncevents[] = {
{0, "A SCSI asynchronous event is reported in the sense data"},
{1, "Target requests logout"},
{2, "Target will/has dropped connection"},
{3, "Target will/has dropped all connections"},
{0, NULL},
};
static const value_string iscsi_snack_types[] = {
{0, "Data/R2T"},
{1, "Status"},
{0, NULL}
};
static const value_string iscsi_reject_reasons[] = {
{0x01, "Full feature phase command before login"},
{0x02, "Data (payload) digest error"},
{0x03, "Data SNACK reject"},
{0x04, "Protocol error"},
{0x05, "Command not supported in this session type"},
{0x06, "Immediate command reject (too many immediate commands)"},
{0x07, "Task in progress"},
{0x08, "Invalid SNACK"},
{0x09, "Bookmark reject (no bookmark for this initiator task tag)"},
{0x0a, "Bookmark reject (can't generate bookmark - out of resources)"},
{0x0b, "Negotiation reset"},
{0, NULL},
};
/*****************************************************************/
/* */
/* CRC LOOKUP TABLE */
/* ================ */
/* The following CRC lookup table was generated automagically */
/* by the Rocksoft^tm Model CRC Algorithm Table Generation */
/* Program V1.0 using the following model parameters: */
/* */
/* Width : 4 bytes. */
/* Poly : 0x1EDC6F41L */
/* Reverse : TRUE. */
/* */
/* For more information on the Rocksoft^tm Model CRC Algorithm, */
/* see the document titled "A Painless Guide to CRC Error */
/* Detection Algorithms" by Ross Williams */
/* (ross@xxxxxxxxxxxxxxxxxxxxx.). This document is likely to be */
/* in the FTP archive "ftp.adelaide.edu.au/pub/rocksoft". */
/* */
/*****************************************************************/
static guint32 crc32Table[256] = {
0x00000000L, 0xF26B8303L, 0xE13B70F7L, 0x1350F3F4L,
0xC79A971FL, 0x35F1141CL, 0x26A1E7E8L, 0xD4CA64EBL,
0x8AD958CFL, 0x78B2DBCCL, 0x6BE22838L, 0x9989AB3BL,
0x4D43CFD0L, 0xBF284CD3L, 0xAC78BF27L, 0x5E133C24L,
0x105EC76FL, 0xE235446CL, 0xF165B798L, 0x030E349BL,
0xD7C45070L, 0x25AFD373L, 0x36FF2087L, 0xC494A384L,
0x9A879FA0L, 0x68EC1CA3L, 0x7BBCEF57L, 0x89D76C54L,
0x5D1D08BFL, 0xAF768BBCL, 0xBC267848L, 0x4E4DFB4BL,
0x20BD8EDEL, 0xD2D60DDDL, 0xC186FE29L, 0x33ED7D2AL,
0xE72719C1L, 0x154C9AC2L, 0x061C6936L, 0xF477EA35L,
0xAA64D611L, 0x580F5512L, 0x4B5FA6E6L, 0xB93425E5L,
0x6DFE410EL, 0x9F95C20DL, 0x8CC531F9L, 0x7EAEB2FAL,
0x30E349B1L, 0xC288CAB2L, 0xD1D83946L, 0x23B3BA45L,
0xF779DEAEL, 0x05125DADL, 0x1642AE59L, 0xE4292D5AL,
0xBA3A117EL, 0x4851927DL, 0x5B016189L, 0xA96AE28AL,
0x7DA08661L, 0x8FCB0562L, 0x9C9BF696L, 0x6EF07595L,
0x417B1DBCL, 0xB3109EBFL, 0xA0406D4BL, 0x522BEE48L,
0x86E18AA3L, 0x748A09A0L, 0x67DAFA54L, 0x95B17957L,
0xCBA24573L, 0x39C9C670L, 0x2A993584L, 0xD8F2B687L,
0x0C38D26CL, 0xFE53516FL, 0xED03A29BL, 0x1F682198L,
0x5125DAD3L, 0xA34E59D0L, 0xB01EAA24L, 0x42752927L,
0x96BF4DCCL, 0x64D4CECFL, 0x77843D3BL, 0x85EFBE38L,
0xDBFC821CL, 0x2997011FL, 0x3AC7F2EBL, 0xC8AC71E8L,
0x1C661503L, 0xEE0D9600L, 0xFD5D65F4L, 0x0F36E6F7L,
0x61C69362L, 0x93AD1061L, 0x80FDE395L, 0x72966096L,
0xA65C047DL, 0x5437877EL, 0x4767748AL, 0xB50CF789L,
0xEB1FCBADL, 0x197448AEL, 0x0A24BB5AL, 0xF84F3859L,
0x2C855CB2L, 0xDEEEDFB1L, 0xCDBE2C45L, 0x3FD5AF46L,
0x7198540DL, 0x83F3D70EL, 0x90A324FAL, 0x62C8A7F9L,
0xB602C312L, 0x44694011L, 0x5739B3E5L, 0xA55230E6L,
0xFB410CC2L, 0x092A8FC1L, 0x1A7A7C35L, 0xE811FF36L,
0x3CDB9BDDL, 0xCEB018DEL, 0xDDE0EB2AL, 0x2F8B6829L,
0x82F63B78L, 0x709DB87BL, 0x63CD4B8FL, 0x91A6C88CL,
0x456CAC67L, 0xB7072F64L, 0xA457DC90L, 0x563C5F93L,
0x082F63B7L, 0xFA44E0B4L, 0xE9141340L, 0x1B7F9043L,
0xCFB5F4A8L, 0x3DDE77ABL, 0x2E8E845FL, 0xDCE5075CL,
0x92A8FC17L, 0x60C37F14L, 0x73938CE0L, 0x81F80FE3L,
0x55326B08L, 0xA759E80BL, 0xB4091BFFL, 0x466298FCL,
0x1871A4D8L, 0xEA1A27DBL, 0xF94AD42FL, 0x0B21572CL,
0xDFEB33C7L, 0x2D80B0C4L, 0x3ED04330L, 0xCCBBC033L,
0xA24BB5A6L, 0x502036A5L, 0x4370C551L, 0xB11B4652L,
0x65D122B9L, 0x97BAA1BAL, 0x84EA524EL, 0x7681D14DL,
0x2892ED69L, 0xDAF96E6AL, 0xC9A99D9EL, 0x3BC21E9DL,
0xEF087A76L, 0x1D63F975L, 0x0E330A81L, 0xFC588982L,
0xB21572C9L, 0x407EF1CAL, 0x532E023EL, 0xA145813DL,
0x758FE5D6L, 0x87E466D5L, 0x94B49521L, 0x66DF1622L,
0x38CC2A06L, 0xCAA7A905L, 0xD9F75AF1L, 0x2B9CD9F2L,
0xFF56BD19L, 0x0D3D3E1AL, 0x1E6DCDEEL, 0xEC064EEDL,
0xC38D26C4L, 0x31E6A5C7L, 0x22B65633L, 0xD0DDD530L,
0x0417B1DBL, 0xF67C32D8L, 0xE52CC12CL, 0x1747422FL,
0x49547E0BL, 0xBB3FFD08L, 0xA86F0EFCL, 0x5A048DFFL,
0x8ECEE914L, 0x7CA56A17L, 0x6FF599E3L, 0x9D9E1AE0L,
0xD3D3E1ABL, 0x21B862A8L, 0x32E8915CL, 0xC083125FL,
0x144976B4L, 0xE622F5B7L, 0xF5720643L, 0x07198540L,
0x590AB964L, 0xAB613A67L, 0xB831C993L, 0x4A5A4A90L,
0x9E902E7BL, 0x6CFBAD78L, 0x7FAB5E8CL, 0x8DC0DD8FL,
0xE330A81AL, 0x115B2B19L, 0x020BD8EDL, 0xF0605BEEL,
0x24AA3F05L, 0xD6C1BC06L, 0xC5914FF2L, 0x37FACCF1L,
0x69E9F0D5L, 0x9B8273D6L, 0x88D28022L, 0x7AB90321L,
0xAE7367CAL, 0x5C18E4C9L, 0x4F48173DL, 0xBD23943EL,
0xF36E6F75L, 0x0105EC76L, 0x12551F82L, 0xE03E9C81L,
0x34F4F86AL, 0xC69F7B69L, 0xD5CF889DL, 0x27A40B9EL,
0x79B737BAL, 0x8BDCB4B9L, 0x988C474DL, 0x6AE7C44EL,
0xBE2DA0A5L, 0x4C4623A6L, 0x5F16D052L, 0xAD7D5351L
};
#define CRC32C_PRELOAD 0xffffffff
static guint32
calculateCRC32(const void *buf, int len, guint32 crc) {
guint8 *p = (guint8 *)buf;
while(len-- > 0)
crc = crc32Table[(crc ^ *p++) & 0xff] ^ (crc >> 8);
return crc;
}
static int
iscsi_min(int a, int b) {
return (a < b)? a : b;
}
static gint
addTextKeys(proto_tree *tt, tvbuff_t *tvb, gint offset, guint32 text_len) {
const gint limit = offset + text_len;
while(offset < limit) {
gint len = tvb_strnlen(tvb, offset, limit - offset);
if(len == -1)
len = limit - offset;
else
len = len + 1;
proto_tree_add_item(tt, hf_iscsi_KeyValue, tvb, offset, len, FALSE);
offset += len;
}
return offset;
}
static gint
handleHeaderDigest(proto_item *ti, tvbuff_t *tvb, guint offset, int headerLen) {
int available_bytes = tvb_length_remaining(tvb, offset);
if(enableHeaderDigests) {
if(headerDigestIsCRC32) {
if(available_bytes >= (headerLen + 4)) {
guint32 crc = ~calculateCRC32(tvb_get_ptr(tvb, offset, headerLen), headerLen, CRC32C_PRELOAD);
guint32 sent = tvb_get_ntohl(tvb, offset + headerLen);
if(crc == sent) {
proto_tree_add_uint_format(ti, hf_iscsi_HeaderDigest32, tvb, offset + headerLen, 4, sent, "HeaderDigest: 0x%08x (Good CRC32)", sent);
}
else {
proto_tree_add_uint_format(ti, hf_iscsi_HeaderDigest32, tvb, offset + headerLen, 4, sent, "HeaderDigest: 0x%08x (Bad CRC32)", sent);
}
}
return offset + headerLen + 4;
}
if(available_bytes >= (headerLen + headerDigestSize)) {
proto_tree_add_item(ti, hf_iscsi_HeaderDigest, tvb, offset + headerLen, headerDigestSize, FALSE);
}
return offset + headerLen + headerDigestSize;
}
return offset + headerLen;
}
static gint
handleDataDigest(proto_item *ti, tvbuff_t *tvb, guint offset, int dataLen) {
int available_bytes = tvb_length_remaining(tvb, offset);
if(enableHeaderDigests) {
if(headerDigestIsCRC32) {
if(available_bytes >= (dataLen + 4)) {
guint32 crc = ~calculateCRC32(tvb_get_ptr(tvb, offset, dataLen), dataLen, CRC32C_PRELOAD);
guint32 sent = tvb_get_ntohl(tvb, offset + dataLen);
if(crc == sent) {
proto_tree_add_uint_format(ti, hf_iscsi_DataDigest32, tvb, offset + dataLen, 4, sent, "DataDigest: 0x%08x (Good CRC32)", sent);
}
else {
proto_tree_add_uint_format(ti, hf_iscsi_DataDigest32, tvb, offset + dataLen, 4, sent, "DataDigest: 0x%08x (Bad CRC32)", sent);
}
}
return offset + dataLen + 4;
}
if(available_bytes >= (dataLen + dataDigestSize)) {
proto_tree_add_item(ti, hf_iscsi_DataDigest, tvb, offset + dataLen, dataDigestSize, FALSE);
}
return offset + dataLen + dataDigestSize;
}
return offset + dataLen;
}
static int
handleDataSegment(proto_item *ti, tvbuff_t *tvb, guint offset, guint dataSegmentLen, guint endOffset, int hf_id) {
if(endOffset > offset) {
int dataOffset = offset;
int dataLen = iscsi_min(dataSegmentLen, endOffset - offset);
if(dataLen > 0) {
proto_tree_add_item(ti, hf_id, tvb, offset, dataLen, FALSE);
offset += dataLen;
}
if(offset < endOffset && (offset & 3) != 0) {
int padding = 4 - (offset & 3);
proto_tree_add_item(ti, hf_iscsi_Padding, tvb, offset, padding, FALSE);
offset += padding;
}
if(dataSegmentLen > 0 && offset < endOffset)
offset = handleDataDigest(ti, tvb, dataOffset, offset - dataOffset);
}
return offset;
}
static int
handleDataSegmentAsTextKeys(proto_item *ti, tvbuff_t *tvb, guint offset, guint dataSegmentLen, guint endOffset, int digestsActive) {
if(endOffset > offset) {
int dataOffset = offset;
int textLen = iscsi_min(dataSegmentLen, endOffset - offset);
if(textLen > 0) {
proto_item *tf = proto_tree_add_text(ti, tvb, offset, textLen, "Key/Value Pairs");
proto_tree *tt = proto_item_add_subtree(tf, ett_iscsi_KeyValues);
offset = addTextKeys(tt, tvb, offset, textLen);
}
if(offset < endOffset && (offset & 3) != 0) {
int padding = 4 - (offset & 3);
proto_tree_add_item(ti, hf_iscsi_Padding, tvb, offset, padding, FALSE);
offset += padding;
}
if(digestsActive && dataSegmentLen > 0 && offset < endOffset)
offset = handleDataDigest(ti, tvb, dataOffset, offset - dataOffset);
}
return offset;
}
/* Code to actually dissect the packets */
static int
dissect_iscsi_pdu(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, guint offset, guint8 opcode, const char *opcode_str, guint32 data_segment_len) {
guint original_offset = offset;
proto_item *ti;
char *scsi_command_name = NULL;
guint cdb_offset = offset + 32; /* offset of CDB from start of PDU */
guint end_offset = offset + tvb_length_remaining(tvb, offset);
/* Make entries in Protocol column and Info column on summary display */
if (check_col(pinfo->fd, COL_PROTOCOL))
col_set_str(pinfo->fd, COL_PROTOCOL, "iSCSI");
if (check_col(pinfo->fd, COL_INFO)) {
col_add_str(pinfo->fd, COL_INFO, (char *)opcode_str);
if((opcode & ~(X_BIT | I_BIT)) == ISCSI_OPCODE_SCSI_COMMAND) {
/* SCSI Command */
guint8 cdb0 = tvb_get_guint8(tvb, cdb_offset);
scsi_command_name = match_strval(cdb0, iscsi_scsi_cdb0);
if(cdb0 == 0x08 || cdb0 == 0x0a) {
/* READ_6 and WRITE_6 */
guint lba = tvb_get_ntohl(tvb, cdb_offset) & 0x1fffff;
guint len = tvb_get_guint8(tvb, cdb_offset + 4);
col_append_fstr(pinfo->fd, COL_INFO, " (%s LBA 0x%06x len 0x%02x)", scsi_command_name, lba, len);
}
else if(cdb0 == 0x28 || cdb0 == 0x2a) {
/* READ_10 and WRITE_10 */
guint lba = tvb_get_ntohl(tvb, cdb_offset + 2);
guint len = tvb_get_ntohs(tvb, cdb_offset + 7);
col_append_fstr(pinfo->fd, COL_INFO, " (%s LBA 0x%08x len 0x%04x)", scsi_command_name, lba, len);
}
else if(scsi_command_name != NULL)
col_append_fstr(pinfo->fd, COL_INFO, " (%s)", scsi_command_name);
}
else if(opcode == ISCSI_OPCODE_SCSI_RESPONSE) {
/* SCSI Command Response */
const char *blurb = NULL;
/* look at response byte */
if(tvb_get_guint8(tvb, offset + 2) == 0) {
/* command completed at target */
blurb = match_strval(tvb_get_guint8(tvb, offset + 3) >> 1, iscsi_scsi_statuses);
}
else
blurb = "Target Failure";
if(blurb != NULL)
col_append_fstr(pinfo->fd, COL_INFO, " (%s)", blurb);
}
}
/* In the interest of speed, if "tree" is NULL, don't do any
work not necessary to generate protocol tree items. */
if (tree) {
/* create display subtree for the protocol */
ti = proto_tree_add_protocol_format(tree, proto_iscsi, tvb,
offset, 0, "iSCSI (%s)",
(char *)opcode_str);
proto_tree_add_uint(ti, hf_iscsi_Opcode, tvb,
offset + 0, 1, opcode);
if((opcode & TARGET_OPCODE_BIT) == 0) {
/* initiator -> target */
gint b = tvb_get_guint8(tvb, offset + 0);
if(opcode != ISCSI_OPCODE_SCSI_DATA_OUT &&
opcode != ISCSI_OPCODE_LOGOUT_COMMAND &&
opcode != ISCSI_OPCODE_SNACK_REQUEST)
proto_tree_add_boolean(ti, hf_iscsi_X, tvb, offset + 0, 1, b);
if(opcode != ISCSI_OPCODE_SCSI_DATA_OUT)
proto_tree_add_boolean(ti, hf_iscsi_I, tvb, offset + 0, 1, b);
}
if(opcode == ISCSI_OPCODE_NOP_OUT) {
/* NOP Out */
proto_tree_add_uint(ti, hf_iscsi_DataSegmentLength, tvb, offset + 5, 3, data_segment_len);
proto_tree_add_item(ti, hf_iscsi_LUN, tvb, offset + 8, 8, FALSE);
proto_tree_add_item(ti, hf_iscsi_InitiatorTaskTag, tvb, offset + 16, 4, FALSE);
proto_tree_add_item(ti, hf_iscsi_TargetTransferTag, tvb, offset + 20, 4, FALSE);
proto_tree_add_item(ti, hf_iscsi_CmdSN, tvb, offset + 24, 4, FALSE);
proto_tree_add_item(ti, hf_iscsi_ExpStatSN, tvb, offset + 28, 4, FALSE);
offset = handleHeaderDigest(ti, tvb, offset, 48);
offset = handleDataSegment(ti, tvb, offset, data_segment_len, end_offset, hf_iscsi_ping_data);
}
else if(opcode == ISCSI_OPCODE_NOP_IN) {
/* NOP In */
proto_tree_add_uint(ti, hf_iscsi_DataSegmentLength, tvb, offset + 5, 3, data_segment_len);
proto_tree_add_item(ti, hf_iscsi_LUN, tvb, offset + 8, 8, FALSE);
proto_tree_add_item(ti, hf_iscsi_InitiatorTaskTag, tvb, offset + 16, 4, FALSE);
proto_tree_add_item(ti, hf_iscsi_TargetTransferTag, tvb, offset + 20, 4, FALSE);
proto_tree_add_item(ti, hf_iscsi_StatSN, tvb, offset + 24, 4, FALSE);
proto_tree_add_item(ti, hf_iscsi_ExpCmdSN, tvb, offset + 28, 4, FALSE);
proto_tree_add_item(ti, hf_iscsi_MaxCmdSN, tvb, offset + 32, 4, FALSE);
offset = handleHeaderDigest(ti, tvb, offset, 48);
offset = handleDataSegment(ti, tvb, offset, data_segment_len, end_offset, hf_iscsi_ping_data);
}
else if(opcode == ISCSI_OPCODE_SCSI_COMMAND) {
/* SCSI Command */
{
gint b = tvb_get_guint8(tvb, offset + 1);
proto_item *tf = proto_tree_add_uint(ti, hf_iscsi_Flags, tvb, offset + 1, 1, b);
proto_tree *tt = proto_item_add_subtree(tf, ett_iscsi_Flags);
proto_tree_add_boolean(tt, hf_iscsi_SCSICommand_F, tvb, offset + 1, 1, b);
proto_tree_add_boolean(tt, hf_iscsi_SCSICommand_R, tvb, offset + 1, 1, b);
proto_tree_add_boolean(tt, hf_iscsi_SCSICommand_W, tvb, offset + 1, 1, b);
proto_tree_add_uint(tt, hf_iscsi_SCSICommand_Attr, tvb, offset + 1, 1, b);
}
proto_tree_add_item(ti, hf_iscsi_SCSICommand_CRN, tvb, offset + 3, 1, FALSE);
proto_tree_add_item(ti, hf_iscsi_TotalAHSLength, tvb, offset + 4, 1, FALSE);
proto_tree_add_uint(ti, hf_iscsi_DataSegmentLength, tvb, offset + 5, 3, data_segment_len);
proto_tree_add_item(ti, hf_iscsi_LUN, tvb, offset + 8, 8, FALSE);
proto_tree_add_item(ti, hf_iscsi_InitiatorTaskTag, tvb, offset + 16, 4, FALSE);
proto_tree_add_item(ti, hf_iscsi_ExpectedDataTransferLength, tvb, offset + 20, 4, FALSE);
proto_tree_add_item(ti, hf_iscsi_CmdSN, tvb, offset + 24, 4, FALSE);
proto_tree_add_item(ti, hf_iscsi_ExpStatSN, tvb, offset + 28, 4, FALSE);
{
/* dissect a little of the CDB for the most common
* commands */
guint8 cdb0 = tvb_get_guint8(tvb, cdb_offset);
gint cdb_len = 16;
proto_item *tf;
/* FIXME - extended CDB */
if(scsi_command_name == NULL)
scsi_command_name = match_strval(cdb0, iscsi_scsi_cdb0);
if(cdb0 == 0x08 || cdb0 == 0x0a) {
/* READ_6 and WRITE_6 */
guint lba = tvb_get_ntohl(tvb, cdb_offset) & 0x1fffff;
guint len = tvb_get_guint8(tvb, cdb_offset + 4);
tf = proto_tree_add_uint_format(ti, hf_iscsi_SCSICommand_CDB0, tvb, cdb_offset, cdb_len, cdb0, "CDB: %s LBA 0x%06x len 0x%02x", scsi_command_name, lba, len);
}
else if(cdb0 == 0x28 || cdb0 == 0x2a) {
/* READ_10 and WRITE_10 */
guint lba = tvb_get_ntohl(tvb, cdb_offset + 2);
guint len = tvb_get_ntohs(tvb, cdb_offset + 7);
tf = proto_tree_add_uint_format(ti, hf_iscsi_SCSICommand_CDB0, tvb, cdb_offset, cdb_len, cdb0, "CDB: %s LBA 0x%08x len 0x%04x", scsi_command_name, lba, len);
}
else
tf = proto_tree_add_uint(ti, hf_iscsi_SCSICommand_CDB0, tvb, cdb_offset, cdb_len, cdb0);
{
proto_tree *tt = proto_item_add_subtree(tf, ett_iscsi_CDB);
proto_tree_add_item(tt, hf_iscsi_SCSICommand_CDB, tvb, cdb_offset, cdb_len, FALSE);
}
offset = handleHeaderDigest(ti, tvb, offset, cdb_offset + cdb_len);
}
offset = handleDataSegment(ti, tvb, offset, data_segment_len, end_offset, hf_iscsi_immediate_data);
}
else if(opcode == ISCSI_OPCODE_SCSI_RESPONSE) {
/* SCSI Response */
{
gint b = tvb_get_guint8(tvb, offset + 1);
proto_item *tf = proto_tree_add_uint(ti, hf_iscsi_Flags, tvb, offset + 1, 1, b);
proto_tree *tt = proto_item_add_subtree(tf, ett_iscsi_Flags);
proto_tree_add_boolean(tt, hf_iscsi_SCSIResponse_o, tvb, offset + 1, 1, b);
proto_tree_add_boolean(tt, hf_iscsi_SCSIResponse_u, tvb, offset + 1, 1, b);
proto_tree_add_boolean(tt, hf_iscsi_SCSIResponse_O, tvb, offset + 1, 1, b);
proto_tree_add_boolean(tt, hf_iscsi_SCSIResponse_U, tvb, offset + 1, 1, b);
}
proto_tree_add_item(ti, hf_iscsi_SCSIResponse_Response, tvb, offset + 2, 1, FALSE);
proto_tree_add_item(ti, hf_iscsi_SCSIResponse_Status, tvb, offset + 3, 1, FALSE);
proto_tree_add_uint(ti, hf_iscsi_DataSegmentLength, tvb, offset + 5, 3, data_segment_len);
proto_tree_add_item(ti, hf_iscsi_InitiatorTaskTag, tvb, offset + 16, 4, FALSE);
proto_tree_add_item(ti, hf_iscsi_SCSIResponse_ResidualCount, tvb, offset + 20, 4, FALSE);
proto_tree_add_item(ti, hf_iscsi_StatSN, tvb, offset + 24, 4, FALSE);
proto_tree_add_item(ti, hf_iscsi_ExpCmdSN, tvb, offset + 28, 4, FALSE);
proto_tree_add_item(ti, hf_iscsi_MaxCmdSN, tvb, offset + 32, 4, FALSE);
proto_tree_add_item(ti, hf_iscsi_ExpDataSN, tvb, offset + 36, 4, FALSE);
proto_tree_add_item(ti, hf_iscsi_SCSIResponse_BidiReadResidualCount, tvb, offset + 44, 4, FALSE);
offset = handleHeaderDigest(ti, tvb, offset, 48);
offset = handleDataSegment(ti, tvb, offset, data_segment_len, end_offset, hf_iscsi_sense_data);
}
else if(opcode == ISCSI_OPCODE_SCSI_TASK_MANAGEMENT_COMMAND) {
/* SCSI Task Command */
proto_tree_add_item(ti, hf_iscsi_SCSITask_Function, tvb, offset + 1, 1, FALSE);
proto_tree_add_item(ti, hf_iscsi_LUN, tvb, offset + 8, 8, FALSE);
proto_tree_add_item(ti, hf_iscsi_InitiatorTaskTag, tvb, offset + 16, 4, FALSE);
proto_tree_add_item(ti, hf_iscsi_SCSITask_ReferencedTaskTag, tvb, offset + 20, 4, FALSE);
proto_tree_add_item(ti, hf_iscsi_CmdSN, tvb, offset + 24, 4, FALSE);
proto_tree_add_item(ti, hf_iscsi_ExpStatSN, tvb, offset + 28, 4, FALSE);
proto_tree_add_item(ti, hf_iscsi_RefCmdSN, tvb, offset + 32, 4, FALSE);
offset = handleHeaderDigest(ti, tvb, offset, 48);
}
else if(opcode == ISCSI_OPCODE_SCSI_TASK_MANAGEMENT_RESPONSE) {
/* SCSI Task Response */
proto_tree_add_item(ti, hf_iscsi_SCSITask_Response, tvb, offset + 2, 1, FALSE);
proto_tree_add_item(ti, hf_iscsi_InitiatorTaskTag, tvb, offset + 16, 4, FALSE);
proto_tree_add_item(ti, hf_iscsi_SCSITask_ReferencedTaskTag, tvb, offset + 20, 4, FALSE);
proto_tree_add_item(ti, hf_iscsi_StatSN, tvb, offset + 24, 4, FALSE);
proto_tree_add_item(ti, hf_iscsi_ExpCmdSN, tvb, offset + 28, 4, FALSE);
proto_tree_add_item(ti, hf_iscsi_MaxCmdSN, tvb, offset + 32, 4, FALSE);
offset = handleHeaderDigest(ti, tvb, offset, 48);
}
else if(opcode == ISCSI_OPCODE_LOGIN_COMMAND) {
/* Login Command */
int digestsActive = 1;
{
gint b = tvb_get_guint8(tvb, offset + 1);
if((b & CSG_MASK) == 0) {
/* current stage is SecurityNegotiation, digests
* are not yet turned on */
digestsActive = 0;
}
#if 0
proto_item *tf = proto_tree_add_uint(ti, hf_iscsi_Flags, tvb, offset + 1, 1, b);
proto_tree *tt = proto_item_add_subtree(tf, ett_iscsi_Flags);
#endif
proto_tree_add_boolean(ti, hf_iscsi_Login_T, tvb, offset + 1, 1, b);
proto_tree_add_item(ti, hf_iscsi_Login_CSG, tvb, offset + 1, 1, FALSE);
proto_tree_add_item(ti, hf_iscsi_Login_NSG, tvb, offset + 1, 1, FALSE);
}
proto_tree_add_item(ti, hf_iscsi_VersionMax, tvb, offset + 2, 1, FALSE);
proto_tree_add_item(ti, hf_iscsi_VersionMin, tvb, offset + 3, 1, FALSE);
proto_tree_add_uint(ti, hf_iscsi_DataSegmentLength, tvb, offset + 5, 3, data_segment_len);
proto_tree_add_item(ti, hf_iscsi_CID, tvb, offset + 8, 2, FALSE);
proto_tree_add_item(ti, hf_iscsi_ISID, tvb, offset + 12, 2, FALSE);
proto_tree_add_item(ti, hf_iscsi_TSID, tvb, offset + 14, 2, FALSE);
proto_tree_add_item(ti, hf_iscsi_InitiatorTaskTag, tvb, offset + 16, 4, FALSE);
proto_tree_add_item(ti, hf_iscsi_CmdSN, tvb, offset + 24, 4, FALSE);
proto_tree_add_item(ti, hf_iscsi_ExpStatSN, tvb, offset + 28, 4, FALSE);
if(digestsActive)
offset = handleHeaderDigest(ti, tvb, offset, 48);
else
offset += 48;
offset = handleDataSegmentAsTextKeys(ti, tvb, offset, data_segment_len, end_offset, digestsActive);
}
else if(opcode == ISCSI_OPCODE_LOGIN_RESPONSE) {
/* Login Response */
int digestsActive = 1;
{
gint b = tvb_get_guint8(tvb, offset + 1);
if((b & CSG_MASK) == 0) {
/* current stage is SecurityNegotiation, digests
* are not yet turned on */
digestsActive = 0;
}
#if 0
proto_item *tf = proto_tree_add_uint(ti, hf_iscsi_Flags, tvb, offset + 1, 1, b);
proto_tree *tt = proto_item_add_subtree(tf, ett_iscsi_Flags);
#endif
proto_tree_add_boolean(ti, hf_iscsi_Login_T, tvb, offset + 1, 1, b);
proto_tree_add_item(ti, hf_iscsi_Login_CSG, tvb, offset + 1, 1, FALSE);
proto_tree_add_item(ti, hf_iscsi_Login_NSG, tvb, offset + 1, 1, FALSE);
}
proto_tree_add_item(ti, hf_iscsi_VersionMax, tvb, offset + 2, 1, FALSE);
proto_tree_add_item(ti, hf_iscsi_VersionActive, tvb, offset + 3, 1, FALSE);
proto_tree_add_uint(ti, hf_iscsi_DataSegmentLength, tvb, offset + 5, 3, data_segment_len);
proto_tree_add_item(ti, hf_iscsi_ISID, tvb, offset + 12, 2, FALSE);
proto_tree_add_item(ti, hf_iscsi_TSID, tvb, offset + 14, 2, FALSE);
proto_tree_add_item(ti, hf_iscsi_InitiatorTaskTag, tvb, offset + 16, 4, FALSE);
proto_tree_add_item(ti, hf_iscsi_StatSN, tvb, offset + 24, 4, FALSE);
proto_tree_add_item(ti, hf_iscsi_ExpCmdSN, tvb, offset + 28, 4, FALSE);
proto_tree_add_item(ti, hf_iscsi_MaxCmdSN, tvb, offset + 32, 4, FALSE);
proto_tree_add_item(ti, hf_iscsi_Login_Status, tvb, offset + 36, 2, FALSE);
if(digestsActive)
offset = handleHeaderDigest(ti, tvb, offset, 48);
else
offset += 48;
offset = handleDataSegmentAsTextKeys(ti, tvb, offset, data_segment_len, end_offset, digestsActive);
}
else if(opcode == ISCSI_OPCODE_TEXT_COMMAND) {
/* Text Command */
{
gint b = tvb_get_guint8(tvb, offset + 1);
proto_item *tf = proto_tree_add_uint(ti, hf_iscsi_Flags, tvb, offset + 1, 1, b);
proto_tree *tt = proto_item_add_subtree(tf, ett_iscsi_Flags);
proto_tree_add_boolean(tt, hf_iscsi_Text_F, tvb, offset + 1, 1, b);
proto_tree_add_uint(ti, hf_iscsi_DataSegmentLength, tvb, offset + 5, 3, data_segment_len);
}
proto_tree_add_item(ti, hf_iscsi_InitiatorTaskTag, tvb, offset + 16, 4, FALSE);
proto_tree_add_item(ti, hf_iscsi_TargetTransferTag, tvb, offset + 20, 4, FALSE);
proto_tree_add_item(ti, hf_iscsi_CmdSN, tvb, offset + 24, 4, FALSE);
proto_tree_add_item(ti, hf_iscsi_ExpStatSN, tvb, offset + 28, 4, FALSE);
offset = handleHeaderDigest(ti, tvb, offset, 48);
offset = handleDataSegmentAsTextKeys(ti, tvb, offset, data_segment_len, end_offset, TRUE);
}
else if(opcode == ISCSI_OPCODE_TEXT_RESPONSE) {
/* Text Response */
{
gint b = tvb_get_guint8(tvb, offset + 1);
proto_item *tf = proto_tree_add_uint(ti, hf_iscsi_Flags, tvb, offset + 1, 1, b);
proto_tree *tt = proto_item_add_subtree(tf, ett_iscsi_Flags);
proto_tree_add_boolean(tt, hf_iscsi_Text_F, tvb, offset + 1, 1, b);
proto_tree_add_uint(ti, hf_iscsi_DataSegmentLength, tvb, offset + 5, 3, data_segment_len);
}
proto_tree_add_item(ti, hf_iscsi_InitiatorTaskTag, tvb, offset + 16, 4, FALSE);
proto_tree_add_item(ti, hf_iscsi_TargetTransferTag, tvb, offset + 20, 4, FALSE);
proto_tree_add_item(ti, hf_iscsi_StatSN, tvb, offset + 24, 4, FALSE);
proto_tree_add_item(ti, hf_iscsi_ExpCmdSN, tvb, offset + 28, 4, FALSE);
proto_tree_add_item(ti, hf_iscsi_MaxCmdSN, tvb, offset + 32, 4, FALSE);
offset = handleHeaderDigest(ti, tvb, offset, 48);
offset = handleDataSegmentAsTextKeys(ti, tvb, offset, data_segment_len, end_offset, TRUE);
}
else if(opcode == ISCSI_OPCODE_SCSI_DATA_OUT) {
/* SCSI Data Out (write) */
{
gint b = tvb_get_guint8(tvb, offset + 1);
proto_item *tf = proto_tree_add_uint(ti, hf_iscsi_Flags, tvb, offset + 1, 1, b);
proto_tree *tt = proto_item_add_subtree(tf, ett_iscsi_Flags);
proto_tree_add_boolean(tt, hf_iscsi_SCSIData_F, tvb, offset + 1, 1, b);
}
proto_tree_add_uint(ti, hf_iscsi_DataSegmentLength, tvb, offset + 5, 3, data_segment_len);
proto_tree_add_item(ti, hf_iscsi_LUN, tvb, offset + 8, 8, FALSE);
proto_tree_add_item(ti, hf_iscsi_InitiatorTaskTag, tvb, offset + 16, 4, FALSE);
proto_tree_add_item(ti, hf_iscsi_TargetTransferTag, tvb, offset + 20, 4, FALSE);
proto_tree_add_item(ti, hf_iscsi_ExpStatSN, tvb, offset + 28, 4, FALSE);
proto_tree_add_item(ti, hf_iscsi_DataSN, tvb, offset + 36, 4, FALSE);
proto_tree_add_item(ti, hf_iscsi_BufferOffset, tvb, offset + 40, 4, FALSE);
offset = handleHeaderDigest(ti, tvb, offset, 48);
offset = handleDataSegment(ti, tvb, offset, data_segment_len, end_offset, hf_iscsi_write_data);
}
else if(opcode == ISCSI_OPCODE_SCSI_DATA_IN) {
/* SCSI Data In (read) */
{
gint b = tvb_get_guint8(tvb, offset + 1);
proto_item *tf = proto_tree_add_uint(ti, hf_iscsi_Flags, tvb, offset + 1, 1, b);
proto_tree *tt = proto_item_add_subtree(tf, ett_iscsi_Flags);
proto_tree_add_boolean(tt, hf_iscsi_SCSIData_F, tvb, offset + 1, 1, b);
proto_tree_add_boolean(tt, hf_iscsi_SCSIData_O, tvb, offset + 1, 1, b);
proto_tree_add_boolean(tt, hf_iscsi_SCSIData_U, tvb, offset + 1, 1, b);
proto_tree_add_boolean(tt, hf_iscsi_SCSIData_S, tvb, offset + 1, 1, b);
}
proto_tree_add_item(ti, hf_iscsi_SCSIResponse_Status, tvb, offset + 3, 1, FALSE);
proto_tree_add_uint(ti, hf_iscsi_DataSegmentLength, tvb, offset + 5, 3, data_segment_len);
proto_tree_add_item(ti, hf_iscsi_InitiatorTaskTag, tvb, offset + 16, 4, FALSE);
proto_tree_add_item(ti, hf_iscsi_SCSIData_ResidualCount, tvb, offset + 20, 4, FALSE);
proto_tree_add_item(ti, hf_iscsi_StatSN, tvb, offset + 24, 4, FALSE);
proto_tree_add_item(ti, hf_iscsi_ExpCmdSN, tvb, offset + 28, 4, FALSE);
proto_tree_add_item(ti, hf_iscsi_MaxCmdSN, tvb, offset + 32, 4, FALSE);
proto_tree_add_item(ti, hf_iscsi_DataSN, tvb, offset + 36, 4, FALSE);
proto_tree_add_item(ti, hf_iscsi_BufferOffset, tvb, offset + 40, 4, FALSE);
offset = handleHeaderDigest(ti, tvb, offset, 48);
offset = handleDataSegment(ti, tvb, offset, data_segment_len, end_offset, hf_iscsi_read_data);
}
else if(opcode == ISCSI_OPCODE_LOGOUT_COMMAND) {
/* Logout Command */
proto_tree_add_item(ti, hf_iscsi_CID, tvb, offset + 8, 2, FALSE);
proto_tree_add_item(ti, hf_iscsi_Logout_Reason, tvb, offset + 11, 1, FALSE);
proto_tree_add_item(ti, hf_iscsi_InitiatorTaskTag, tvb, offset + 16, 4, FALSE);
proto_tree_add_item(ti, hf_iscsi_ExpStatSN, tvb, offset + 28, 4, FALSE);
offset = handleHeaderDigest(ti, tvb, offset, 48);
}
else if(opcode == ISCSI_OPCODE_LOGOUT_RESPONSE) {
/* Logout Response */
proto_tree_add_item(ti, hf_iscsi_Logout_Response, tvb, offset + 2, 1, FALSE);
proto_tree_add_item(ti, hf_iscsi_InitiatorTaskTag, tvb, offset + 16, 4, FALSE);
proto_tree_add_item(ti, hf_iscsi_ExpCmdSN, tvb, offset + 28, 4, FALSE);
proto_tree_add_item(ti, hf_iscsi_MaxCmdSN, tvb, offset + 32, 4, FALSE);
proto_tree_add_item(ti, hf_iscsi_Time2Wait, tvb, offset + 40, 2, FALSE);
proto_tree_add_item(ti, hf_iscsi_Time2Retain, tvb, offset + 42, 2, FALSE);
offset = handleHeaderDigest(ti, tvb, offset, 48);
}
else if(opcode == ISCSI_OPCODE_SNACK_REQUEST) {
/* SNACK Request */
{
gint b = tvb_get_guint8(tvb, offset + 1);
#if 0
proto_item *tf = proto_tree_add_uint(ti, hf_iscsi_Flags, tvb, offset + 1, 1, b);
proto_tree *tt = proto_item_add_subtree(tf, ett_iscsi_Flags);
#endif
proto_tree_add_item(ti, hf_iscsi_snack_type, tvb, offset + 1, 1, b);
}
proto_tree_add_item(ti, hf_iscsi_InitiatorTaskTag, tvb, offset + 16, 4, FALSE);
proto_tree_add_item(ti, hf_iscsi_BegRun, tvb, offset + 20, 4, FALSE);
proto_tree_add_item(ti, hf_iscsi_RunLength, tvb, offset + 24, 4, FALSE);
proto_tree_add_item(ti, hf_iscsi_ExpStatSN, tvb, offset + 28, 4, FALSE);
proto_tree_add_item(ti, hf_iscsi_ExpDataSN, tvb, offset + 36, 4, FALSE);
offset = handleHeaderDigest(ti, tvb, offset, 48);
}
else if(opcode == ISCSI_OPCODE_R2T) {
/* R2T */
proto_tree_add_item(ti, hf_iscsi_InitiatorTaskTag, tvb, offset + 16, 4, FALSE);
proto_tree_add_item(ti, hf_iscsi_TargetTransferTag, tvb, offset + 20, 4, FALSE);
proto_tree_add_item(ti, hf_iscsi_StatSN, tvb, offset + 24, 4, FALSE);
proto_tree_add_item(ti, hf_iscsi_ExpCmdSN, tvb, offset + 28, 4, FALSE);
proto_tree_add_item(ti, hf_iscsi_MaxCmdSN, tvb, offset + 32, 4, FALSE);
proto_tree_add_item(ti, hf_iscsi_R2TSN, tvb, offset + 36, 4, FALSE);
proto_tree_add_item(ti, hf_iscsi_BufferOffset, tvb, offset + 40, 4, FALSE);
proto_tree_add_item(ti, hf_iscsi_DesiredDataLength, tvb, offset + 44, 4, FALSE);
offset = handleHeaderDigest(ti, tvb, offset, 48);
}
else if(opcode == ISCSI_OPCODE_ASYNC_MESSAGE) {
/* Asynchronous Message */
proto_tree_add_uint(ti, hf_iscsi_DataSegmentLength, tvb, offset + 5, 3, data_segment_len);
proto_tree_add_item(ti, hf_iscsi_LUN, tvb, offset + 8, 8, FALSE);
proto_tree_add_item(ti, hf_iscsi_StatSN, tvb, offset + 24, 4, FALSE);
proto_tree_add_item(ti, hf_iscsi_ExpCmdSN, tvb, offset + 28, 4, FALSE);
proto_tree_add_item(ti, hf_iscsi_MaxCmdSN, tvb, offset + 32, 4, FALSE);
proto_tree_add_item(ti, hf_iscsi_AsyncEvent, tvb, offset + 36, 1, FALSE);
proto_tree_add_item(ti, hf_iscsi_EventVendorCode, tvb, offset + 37, 1, FALSE);
proto_tree_add_item(ti, hf_iscsi_Parameter1, tvb, offset + 38, 2, FALSE);
proto_tree_add_item(ti, hf_iscsi_Parameter2, tvb, offset + 40, 2, FALSE);
proto_tree_add_item(ti, hf_iscsi_Parameter3, tvb, offset + 42, 2, FALSE);
offset = handleHeaderDigest(ti, tvb, offset, 48);
}
else if(opcode == ISCSI_OPCODE_REJECT) {
/* Reject */
proto_tree_add_item(ti, hf_iscsi_Reject_Reason, tvb, offset + 2, 1, FALSE);
proto_tree_add_uint(ti, hf_iscsi_DataSegmentLength, tvb, offset + 5, 3, data_segment_len);
proto_tree_add_item(ti, hf_iscsi_StatSN, tvb, offset + 24, 4, FALSE);
proto_tree_add_item(ti, hf_iscsi_ExpCmdSN, tvb, offset + 28, 4, FALSE);
proto_tree_add_item(ti, hf_iscsi_MaxCmdSN, tvb, offset + 32, 4, FALSE);
proto_tree_add_item(ti, hf_iscsi_DataSN, tvb, offset + 36, 4, FALSE);
offset = handleHeaderDigest(ti, tvb, offset, 48);
offset = handleDataSegment(ti, tvb, offset, data_segment_len, end_offset, hf_iscsi_error_pdu_data);
}
proto_item_set_len(ti, offset - original_offset);
}
else {
/* FIXME - this really should gobble up digests and data segment */
offset += 48;
}
return offset - original_offset;
}
static gboolean
dissect_iscsi(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree) {
static int desegmenting;
/* Set up structures needed to add the protocol subtree and manage it */
guint iSCSIPdusDissected = 0;
guint offset = 0;
guint32 available_bytes = tvb_length_remaining(tvb, offset);
if (!proto_is_protocol_enabled(proto_iscsi))
return FALSE; /* iSCSI has been disabled */
/* quick check to see if the packet is long enough to contain the
* minimum amount of information we need */
if (available_bytes < 48 && (!iscsi_desegment || available_bytes < 8)) {
/* no, so give up */
if(desegmenting) fprintf(stderr, "FAIL: available_bytes = %d\n", available_bytes);
return FALSE;
}
/* process multiple iSCSI PDUs per packet */
while(available_bytes >= 48 || (iscsi_desegment && available_bytes >= 8)) {
const char *opcode_str = NULL;
guint32 data_segment_len;
guint8 opcode = tvb_get_guint8(tvb, offset + 0);
guint8 secondPduByte = tvb_get_guint8(tvb, offset + 1);
int badPdu = FALSE;
if((opcode & TARGET_OPCODE_BIT) == 0) {
/* initiator -> target */
/* mask out X and I bits */
opcode &= ~(X_BIT | I_BIT);
}
opcode_str = match_strval(opcode, iscsi_opcodes);
data_segment_len = tvb_get_ntohl(tvb, offset + 4) & 0x00ffffff;
if(opcode_str == NULL) {
badPdu = TRUE;
if(desegmenting) fprintf(stderr, "FAIL: opcode = 0x%2x\n", opcode);
}
else if(iscsi_port != 0 &&
(((opcode & TARGET_OPCODE_BIT) && pinfo->srcport != iscsi_port) ||
(!(opcode & TARGET_OPCODE_BIT) && pinfo->destport != iscsi_port))) {
badPdu = TRUE;
if(desegmenting) fprintf(stderr, "FAIL: srcport = %d destport = %d\n", pinfo->srcport, pinfo->destport);
}
else if(enable_bogosity_filter) {
/* try and distinguish between data and real headers */
if(data_segment_len > bogus_pdu_data_length_threshold) {
badPdu = TRUE;
if(desegmenting) fprintf(stderr, "FAIL: data_segment_len = %d\n", data_segment_len);
}
else if(!(secondPduByte & 0x80) &&
(opcode == ISCSI_OPCODE_NOP_OUT ||
opcode == ISCSI_OPCODE_NOP_IN ||
opcode == ISCSI_OPCODE_LOGOUT_COMMAND ||
opcode == ISCSI_OPCODE_LOGOUT_RESPONSE ||
opcode == ISCSI_OPCODE_SCSI_RESPONSE ||
opcode == ISCSI_OPCODE_SCSI_TASK_MANAGEMENT_RESPONSE ||
opcode == ISCSI_OPCODE_R2T ||
opcode == ISCSI_OPCODE_ASYNC_MESSAGE ||
opcode == ISCSI_OPCODE_SNACK_REQUEST ||
opcode == ISCSI_OPCODE_REJECT)) {
badPdu = TRUE;
if(desegmenting) fprintf(stderr, "FAIL: second byte = 0x%2x\n", secondPduByte);
}
}
desegmenting = 0;
if(badPdu) {
return iSCSIPdusDissected > 0;
}
else {
/*
* Desegmentation check.
*/
if(iscsi_desegment && pinfo->can_desegment) {
guint32 pduLen = 48;
int digestsActive = 1;
if(opcode == ISCSI_OPCODE_LOGIN_COMMAND ||
opcode == ISCSI_OPCODE_LOGIN_RESPONSE) {
if((secondPduByte & CSG_MASK) == 0) {
/* current stage is SecurityNegotiation, digests
* are not yet turned on */
digestsActive = 0;
}
}
pduLen += data_segment_len;
if((pduLen & 3) != 0)
pduLen += 4 - (pduLen & 3);
if(digestsActive && enableHeaderDigests) {
if(headerDigestIsCRC32)
pduLen += 4;
else
pduLen += headerDigestSize;
}
if(digestsActive && data_segment_len > 0 && enableDataDigests) {
if(dataDigestIsCRC32)
pduLen += 4;
else
pduLen += dataDigestSize;
}
if(pduLen > available_bytes) {
/*
* This frame doesn't have all of the data for
* this message, but we can do reassembly on it.
*
* Tell the TCP dissector where the data for this
* message starts in the data it handed us, and
* how many more bytes we need, and return.
*/
fprintf(stderr, "opcode = 0x%2x, data_segment_len = %d, pduLen = %d, available_bytes = %d, offset = %d\n", opcode, data_segment_len, pduLen, available_bytes, offset);
pinfo->desegment_offset = offset;
pinfo->desegment_len = pduLen - available_bytes;
desegmenting = 1;
return TRUE;
}
}
{
int pduLen = dissect_iscsi_pdu(tvb, pinfo, tree, offset, opcode, opcode_str, data_segment_len);
offset += pduLen;
available_bytes -= pduLen;
++iSCSIPdusDissected;
}
}
}
return iSCSIPdusDissected > 0;
}
/* Register the protocol with Ethereal */
/*
* this format is require because a script is used to build the C
* function that calls all the protocol registration.
*/
void
proto_register_iscsi(void)
{
/* Setup list of header fields See Section 1.6.1 for details*/
static hf_register_info hf[] = {
{ &hf_iscsi_Padding,
{ "Padding", "iscsi.padding",
FT_BYTES, BASE_HEX, NULL, 0,
"Padding to 4 byte boundary", HFILL }
},
{ &hf_iscsi_ping_data,
{ "PingData", "iscsi.pingdata",
FT_BYTES, BASE_HEX, NULL, 0,
"Ping Data", HFILL }
},
{ &hf_iscsi_immediate_data,
{ "ImmediateData", "iscsi.immediatedata",
FT_BYTES, BASE_HEX, NULL, 0,
"Immediate Data", HFILL }
},
{ &hf_iscsi_sense_data,
{ "SenseData", "iscsi.sensedata",
FT_BYTES, BASE_HEX, NULL, 0,
"Sense Data", HFILL }
},
{ &hf_iscsi_write_data,
{ "WriteData", "iscsi.writedata",
FT_BYTES, BASE_HEX, NULL, 0,
"Write Data", HFILL }
},
{ &hf_iscsi_read_data,
{ "ReadData", "iscsi.readdata",
FT_BYTES, BASE_HEX, NULL, 0,
"Read Data", HFILL }
},
{ &hf_iscsi_error_pdu_data,
{ "ErrorPDUData", "iscsi.errorpdudata",
FT_BYTES, BASE_HEX, NULL, 0,
"Error PDU Data", HFILL }
},
{ &hf_iscsi_HeaderDigest,
{ "HeaderDigest", "iscsi.headerdigest",
FT_BYTES, BASE_HEX, NULL, 0,
"Header Digest", HFILL }
},
{ &hf_iscsi_HeaderDigest32,
{ "HeaderDigest", "iscsi.headerdigest32",
FT_UINT32, BASE_HEX, NULL, 0,
"Header Digest", HFILL }
},
{ &hf_iscsi_DataDigest,
{ "DataDigest", "iscsi.datadigest",
FT_BYTES, BASE_HEX, NULL, 0,
"Data Digest", HFILL }
},
{ &hf_iscsi_DataDigest32,
{ "DataDigest", "iscsi.datadigest32",
FT_UINT32, BASE_HEX, NULL, 0,
"Data Digest", HFILL }
},
{ &hf_iscsi_Opcode,
{ "Opcode", "iscsi.opcode",
FT_UINT8, BASE_HEX, VALS(iscsi_opcodes), 0,
"Opcode", HFILL }
},
{ &hf_iscsi_X,
{ "X", "iscsi.X",
FT_BOOLEAN, 8, TFS(&iscsi_meaning_X), 0x80,
"Command Retry", HFILL }
},
{ &hf_iscsi_I,
{ "I", "iscsi.I",
FT_BOOLEAN, 8, TFS(&iscsi_meaning_I), 0x40,
"Immediate delivery", HFILL }
},
{ &hf_iscsi_Flags,
{ "Flags", "iscsi.flags",
FT_UINT8, BASE_HEX, NULL, 0,
"Opcode specific flags", HFILL }
},
{ &hf_iscsi_SCSICommand_F,
{ "F", "iscsi.scsicommand.F",
FT_BOOLEAN, 8, TFS(&iscsi_meaning_F), 0x80,
"PDU completes command", HFILL }
},
{ &hf_iscsi_SCSICommand_R,
{ "R", "iscsi.scsicommand.R",
FT_BOOLEAN, 8, TFS(&iscsi_meaning_R), 0x40,
"Command reads from SCSI target", HFILL }
},
{ &hf_iscsi_SCSICommand_W,
{ "W", "iscsi.scsicommand.W",
FT_BOOLEAN, 8, TFS(&iscsi_meaning_W), 0x20,
"Command writes to SCSI target", HFILL }
},
{ &hf_iscsi_SCSICommand_Attr,
{ "Attr", "iscsi.scsicommand.attr",
FT_UINT8, BASE_HEX, VALS(iscsi_scsicommand_taskattrs), 0x07,
"SCSI task attributes", HFILL }
},
{ &hf_iscsi_SCSICommand_CRN,
{ "CRN", "iscsi.scsicommand.crn",
FT_UINT8, BASE_HEX, NULL, 0,
"SCSI command reference number", HFILL }
},
{ &hf_iscsi_SCSICommand_AddCDB,
{ "AddCDB", "iscsi.scsicommand.addcdb",
FT_UINT8, BASE_HEX, NULL, 0,
"Additional CDB length (in 4 byte units)", HFILL }
},
{ &hf_iscsi_DataSegmentLength,
{ "DataSegmentLength", "iscsi.datasegmentlength",
FT_UINT32, BASE_HEX, NULL, 0,
"Data segment length (bytes)", HFILL }
},
{ &hf_iscsi_TotalAHSLength,
{ "TotalAHSLength", "iscsi.totalahslength",
FT_UINT8, BASE_HEX, NULL, 0,
"Total additional header segment length (4 byte words)", HFILL }
},
{ &hf_iscsi_LUN,
{ "LUN", "iscsi.lun",
FT_BYTES, BASE_HEX, NULL, 0,
"Logical Unit Number", HFILL }
},
{ &hf_iscsi_InitiatorTaskTag,
{ "InitiatorTaskTag", "iscsi.initiatortasktag",
FT_UINT32, BASE_HEX, NULL, 0,
"Initiator's task tag", HFILL }
},
{ &hf_iscsi_ExpectedDataTransferLength,
{ "ExpectedDataTransferLength", "iscsi.scsicommand.expecteddatatransferlength",
FT_UINT32, BASE_HEX, NULL, 0,
"Expected length of data transfer", HFILL }
},
{ &hf_iscsi_CmdSN,
{ "CmdSN", "iscsi.cmdsn",
FT_UINT32, BASE_HEX, NULL, 0,
"Sequence number for this command (0 == immediate)", HFILL }
},
{ &hf_iscsi_ExpStatSN,
{ "ExpStatSN", "iscsi.expstatsn",
FT_UINT32, BASE_HEX, NULL, 0,
"Next expected status sequence number", HFILL }
},
{ &hf_iscsi_SCSICommand_CDB,
{ "CDB", "iscsi.scsicommand.cdb",
FT_BYTES, BASE_HEX, NULL, 0,
"SCSI CDB", HFILL }
},
{ &hf_iscsi_SCSICommand_CDB0,
{ "CDB", "iscsi.scsicommand.cdb0",
FT_UINT8, BASE_HEX, VALS(iscsi_scsi_cdb0), 0,
"SCSI CDB[0]", HFILL }
},
{ &hf_iscsi_SCSIResponse_ResidualCount,
{ "ResidualCount", "iscsi.scsiresponse.residualcount",
FT_UINT32, BASE_HEX, NULL, 0,
"Residual count", HFILL }
},
{ &hf_iscsi_StatSN,
{ "StatSN", "iscsi.statsn",
FT_UINT32, BASE_HEX, NULL, 0,
"Status sequence number", HFILL }
},
{ &hf_iscsi_ExpCmdSN,
{ "ExpCmdSN", "iscsi.expcmdsn",
FT_UINT32, BASE_HEX, NULL, 0,
"Next expected command sequence number", HFILL }
},
{ &hf_iscsi_MaxCmdSN,
{ "MaxCmdSN", "iscsi.maxcmdsn",
FT_UINT32, BASE_HEX, NULL, 0,
"Maximum acceptable command sequence number", HFILL }
},
{ &hf_iscsi_SCSIResponse_o,
{ "o", "iscsi.scsiresponse.o",
FT_BOOLEAN, 8, TFS(&iscsi_meaning_o), 0x10,
"Bi-directional read residual overflow", HFILL }
},
{ &hf_iscsi_SCSIResponse_u,
{ "u", "iscsi.scsiresponse.u",
FT_BOOLEAN, 8, TFS(&iscsi_meaning_u), 0x08,
"Bi-directional read residual underflow", HFILL }
},
{ &hf_iscsi_SCSIResponse_O,
{ "O", "iscsi.scsiresponse.O",
FT_BOOLEAN, 8, TFS(&iscsi_meaning_O), 0x04,
"Residual overflow", HFILL }
},
{ &hf_iscsi_SCSIResponse_U,
{ "U", "iscsi.scsiresponse.U",
FT_BOOLEAN, 8, TFS(&iscsi_meaning_U), 0x02,
"Residual underflow", HFILL }
},
{ &hf_iscsi_SCSIResponse_Status,
{ "Status", "iscsi.scsiresponse.status",
FT_UINT8, BASE_HEX, VALS(iscsi_scsi_statuses), 0,
"SCSI command status value", HFILL }
},
{ &hf_iscsi_SCSIResponse_Response,
{ "Response", "iscsi.scsiresponse.response",
FT_UINT8, BASE_HEX, VALS(iscsi_scsi_responses), 0,
"SCSI command response value", HFILL }
},
{ &hf_iscsi_SCSIResponse_BidiReadResidualCount,
{ "BidiReadResidualCount", "iscsi.scsiresponse.bidireadresidualcount",
FT_UINT32, BASE_HEX, NULL, 0,
"Bi-directional read residual count", HFILL }
},
{ &hf_iscsi_SCSIData_F,
{ "F", "iscsi.scsidata.F",
FT_BOOLEAN, 8, TFS(&iscsi_meaning_F), 0x80,
"Final PDU", HFILL }
},
{ &hf_iscsi_SCSIData_S,
{ "S", "iscsi.scsidata.S",
FT_BOOLEAN, 8, TFS(&iscsi_meaning_S), 0x01,
"PDU Contains SCSI command status", HFILL }
},
{ &hf_iscsi_SCSIData_U,
{ "U", "iscsi.scsidata.U",
FT_BOOLEAN, 8, TFS(&iscsi_meaning_U), 0x02,
"Residual underflow", HFILL }
},
{ &hf_iscsi_SCSIData_O,
{ "O", "iscsi.scsidata.O",
FT_BOOLEAN, 8, TFS(&iscsi_meaning_O), 0x04,
"Residual overflow", HFILL }
},
{ &hf_iscsi_TargetTransferTag,
{ "TargetTransferTag", "iscsi.targettransfertag",
FT_UINT32, BASE_HEX, NULL, 0,
"Target transfer tag", HFILL }
},
{ &hf_iscsi_BufferOffset,
{ "BufferOffset", "iscsi.bufferOffset",
FT_UINT32, BASE_HEX, NULL, 0,
"Buffer offset", HFILL }
},
{ &hf_iscsi_SCSIData_ResidualCount,
{ "ResidualCount", "iscsi.scsidata.readresidualcount",
FT_UINT32, BASE_HEX, NULL, 0,
"Residual count", HFILL }
},
{ &hf_iscsi_DataSN,
{ "DataSN", "iscsi.datasn",
FT_UINT32, BASE_HEX, NULL, 0,
"Data sequence number", HFILL }
},
{ &hf_iscsi_VersionMax,
{ "VersionMax", "iscsi.versionmax",
FT_UINT8, BASE_HEX, NULL, 0,
"Maximum supported protocol version", HFILL }
},
{ &hf_iscsi_VersionMin,
{ "VersionMin", "iscsi.versionmin",
FT_UINT8, BASE_HEX, NULL, 0,
"Minimum supported protocol version", HFILL }
},
{ &hf_iscsi_VersionActive,
{ "VersionActive", "iscsi.versionactive",
FT_UINT8, BASE_HEX, NULL, 0,
"Negotiated protocol version", HFILL }
},
{ &hf_iscsi_CID,
{ "CID", "iscsi.cid",
FT_UINT16, BASE_HEX, NULL, 0,
"Connection identifier", HFILL }
},
{ &hf_iscsi_ISID,
{ "ISID", "iscsi.isid",
FT_UINT16, BASE_HEX, NULL, 0,
"Initiator part of session identifier", HFILL }
},
{ &hf_iscsi_TSID,
{ "TSID", "iscsi.tsid",
FT_UINT16, BASE_HEX, NULL, 0,
"Target part of session identifier", HFILL }
},
{ &hf_iscsi_InitStatSN,
{ "InitStatSN", "iscsi.initstatsn",
FT_UINT32, BASE_HEX, NULL, 0,
"Initial status sequence number", HFILL }
},
{ &hf_iscsi_InitCmdSN,
{ "InitCmdSN", "iscsi.initcmdsn",
FT_UINT32, BASE_HEX, NULL, 0,
"Initial command sequence number", HFILL }
},
{ &hf_iscsi_Login_T,
{ "T", "iscsi.login.T",
FT_BOOLEAN, 8, TFS(&iscsi_meaning_T), 0x80,
"Transit to next login stage", HFILL }
},
{ &hf_iscsi_Login_CSG,
{ "CSG", "iscsi.login.csg",
FT_UINT8, BASE_HEX, VALS(iscsi_login_stage), CSG_MASK,
"Current stage", HFILL }
},
{ &hf_iscsi_Login_NSG,
{ "NSG", "iscsi.login.nsg",
FT_UINT8, BASE_HEX, VALS(iscsi_login_stage), 0x03,
"Next stage", HFILL }
},
{ &hf_iscsi_Login_Status,
{ "Status", "iscsi.login.status",
FT_UINT16, BASE_HEX, VALS(iscsi_login_status), 0,
"Status class and detail", HFILL }
},
{ &hf_iscsi_KeyValue,
{ "KeyValue", "iscsi.keyvalue",
FT_STRING, 0, NULL, 0,
"Key/value pair", HFILL }
},
{ &hf_iscsi_Text_F,
{ "F", "iscsi.text.F",
FT_BOOLEAN, 8, TFS(&iscsi_meaning_F), 0x80,
"Final PDU in text sequence", HFILL }
},
{ &hf_iscsi_ExpDataSN,
{ "ExpDataSN", "iscsi.expdatasn",
FT_UINT32, BASE_HEX, NULL, 0,
"Next expected data sequence number", HFILL }
},
{ &hf_iscsi_R2TSN,
{ "R2TSN", "iscsi.r2tsn",
FT_UINT32, BASE_HEX, NULL, 0,
"R2T PDU Number", HFILL }
},
{ &hf_iscsi_SCSITask_Response,
{ "Response", "iscsi.scsitask.response",
FT_UINT8, BASE_HEX, VALS(iscsi_task_responses), 0,
"Response", HFILL }
},
{ &hf_iscsi_SCSITask_ReferencedTaskTag,
{ "InitiatorTaskTag", "iscsi.scsitask.referencedtasktag",
FT_UINT32, BASE_HEX, NULL, 0,
"Task's initiator task tag", HFILL }
},
{ &hf_iscsi_RefCmdSN,
{ "RefCmdSN", "iscsi.refcmdsn",
FT_UINT32, BASE_HEX, NULL, 0,
"Command sequence number for command to be aborted", HFILL }
},
{ &hf_iscsi_SCSITask_Function,
{ "Function", "iscsi.scsitask.function",
FT_UINT8, BASE_HEX, VALS(iscsi_task_functions), 0x7F,
"Requested task function", HFILL }
},
{ &hf_iscsi_Logout_Reason,
{ "Reason", "iscsi.logout.reason",
FT_UINT8, BASE_HEX, VALS(iscsi_logout_reasons), 0,
"Reason for logout", HFILL }
},
{ &hf_iscsi_Logout_Response,
{ "Response", "iscsi.logout.response",
FT_UINT8, BASE_HEX, VALS(iscsi_logout_response), 0,
"Logout response", HFILL }
},
{ &hf_iscsi_Time2Wait,
{ "Time2Wait", "iscsi.time2wait",
FT_UINT16, BASE_HEX, NULL, 0,
"Time2Wait", HFILL }
},
{ &hf_iscsi_Time2Retain,
{ "Time2Retain", "iscsi.time2retain",
FT_UINT16, BASE_HEX, NULL, 0,
"Time2Retain", HFILL }
},
{ &hf_iscsi_DesiredDataLength,
{ "DesiredDataLength", "iscsi.desireddatalength",
FT_UINT32, BASE_HEX, NULL, 0,
"Desired data length (bytes)", HFILL }
},
{ &hf_iscsi_AsyncEvent,
{ "AsyncEvent", "iscsi.asyncevent",
FT_UINT8, BASE_HEX, VALS(iscsi_asyncevents), 0,
"Async event type", HFILL }
},
{ &hf_iscsi_EventVendorCode,
{ "EventVendorCode", "iscsi.eventvendorcode",
FT_UINT8, BASE_HEX, NULL, 0,
"Event vendor code", HFILL }
},
{ &hf_iscsi_Parameter1,
{ "Parameter1", "iscsi.parameter1",
FT_UINT16, BASE_HEX, NULL, 0,
"Parameter 1", HFILL }
},
{ &hf_iscsi_Parameter2,
{ "Parameter2", "iscsi.parameter2",
FT_UINT16, BASE_HEX, NULL, 0,
"Parameter 2", HFILL }
},
{ &hf_iscsi_Parameter3,
{ "Parameter3", "iscsi.parameter3",
FT_UINT16, BASE_HEX, NULL, 0,
"Parameter 3", HFILL }
},
{ &hf_iscsi_Reject_Reason,
{ "Reason", "iscsi.reject.reason",
FT_UINT8, BASE_HEX, VALS(iscsi_reject_reasons), 0,
"Reason for command rejection", HFILL }
},
{ &hf_iscsi_snack_type,
{ "S", "iscsi.snack.type",
FT_UINT8, 8, VALS(iscsi_snack_types), 0x0f,
"Type of SNACK requested", HFILL }
},
{ &hf_iscsi_BegRun,
{ "BegRun", "iscsi.snack.begrun",
FT_UINT32, BASE_HEX, NULL, 0,
"First missed DataSN or StatSN", HFILL }
},
{ &hf_iscsi_RunLength,
{ "RunLength", "iscsi.snack.runlength",
FT_UINT32, BASE_HEX, NULL, 0,
"Number of additional missing status PDUs in this run", HFILL }
},
};
/* Setup protocol subtree array */
static gint *ett[] = {
&ett_iscsi_KeyValues,
&ett_iscsi_CDB,
&ett_iscsi_Flags,
};
/* Register the protocol name and description */
proto_iscsi = proto_register_protocol("iSCSI", "ISCSI", "iscsi");
/* Required function calls to register the header fields and
* subtrees used */
proto_register_field_array(proto_iscsi, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
{
module_t *iscsi_module = prefs_register_protocol(proto_iscsi, NULL);
prefs_register_bool_preference(iscsi_module,
"desegment_iscsi_messages",
"Desegment iSCSI messages",
"When enabled, iSCSI messages that span multiple TCP segments are desegmented",
&iscsi_desegment);
prefs_register_bool_preference(iscsi_module,
"bogus_pdu_filter",
"Enable bogus pdu filter",
"When enabled, packets that appear bogus are ignored",
&enable_bogosity_filter);
prefs_register_uint_preference(iscsi_module,
"bogus_pdu_max_data_len",
"Bogus pdu max data length threshold",
"Treat packets whose data segment length is greater than this value as bogus",
10,
&bogus_pdu_data_length_threshold);
prefs_register_uint_preference(iscsi_module,
"iscsi_port",
"Target port",
"Port number of iSCSI target",
10,
&iscsi_port);
prefs_register_bool_preference(iscsi_module,
"enable_header_digests",
"Enable header digests",
"When enabled, pdus are assumed to contain a header digest",
&enableHeaderDigests);
prefs_register_bool_preference(iscsi_module,
"enable_data_digests",
"Enable data digests",
"When enabled, pdus are assumed to contain a data digest",
&enableDataDigests);
prefs_register_bool_preference(iscsi_module,
"header_digest_is_crc32c",
"Header digest is CRC32C",
"When enabled, header digests are assumed to be CRC32C",
&headerDigestIsCRC32);
prefs_register_bool_preference(iscsi_module,
"data_digest_is_crc32c",
"Data digest is CRC32C",
"When enabled, data digests are assumed to be CRC32C",
&dataDigestIsCRC32);
prefs_register_uint_preference(iscsi_module,
"header_digest_size",
"Header digest size",
"The size of a header digest (bytes)",
10,
&headerDigestSize);
prefs_register_uint_preference(iscsi_module,
"data_digest_size",
"Data digest size",
"The size of a data digest (bytes)",
10,
&dataDigestSize);
}
}
/*
* If this dissector uses sub-dissector registration add a
* registration routine.
*/
/*
* This format is required because a script is used to find these
* routines and create the code that calls these routines.
*/
void
proto_reg_handoff_iscsi(void)
{
heur_dissector_add("tcp", dissect_iscsi, proto_iscsi);
}
Attachment:
bad_desegment.pcap.gz
Description: Binary data
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