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Remove svn:executable Add svn:eol-style native Add svn:keywords Id svn path=/trunk/; revision=15179
563 lines
20 KiB
C
563 lines
20 KiB
C
/* packet-ifcp.c
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* Routines for iFCP dissection
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* RFC 3821, RFC 3643
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*
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* Copyright 2005 Aboo Valappil (valappil_aboo@emc.com)
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*
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*
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* Significantly based on packet-fcip.c by
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* Copyright 2001, Dinesh G Dutt (ddutt@cisco.com)
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*
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* $Id$
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*
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* Ethereal - Network traffic analyzer
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* By Gerald Combs <gerald@ethereal.com>
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* Copyright 1998 Gerald Combs
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <glib.h>
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#include <epan/packet.h>
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#include <epan/prefs.h>
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#define iFCP_ENCAP_HEADER_LEN 28
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#define iFCP_MIN_HEADER_LEN 16 /* upto frame len field */
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typedef enum {
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iFCP_EOFn = 0x41,
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iFCP_EOFt = 0x42,
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iFCP_EOFrt = 0x44,
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iFCP_EOFdt = 0x46,
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iFCP_EOFni = 0x49,
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iFCP_EOFdti = 0x4E,
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iFCP_EOFrti = 0x4F,
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iFCP_EOFa = 0x50
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} ifcp_eof_t;
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typedef enum {
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iFCP_SOFf = 0x28,
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iFCP_SOFi4 = 0x29,
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iFCP_SOFi2 = 0x2D,
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iFCP_SOFi3 = 0x2E,
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iFCP_SOFn4 = 0x31,
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iFCP_SOFn2 = 0x35,
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iFCP_SOFn3 = 0x36,
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iFCP_SOFc4 = 0x39
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} ifcp_sof_t;
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typedef enum {
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FCENCAP_PROTO_FCIP = 1,
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FCENCAP_PROTO_iFCP = 2
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} fcencap_proto_t;
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static const value_string ifcp_eof_vals[] = {
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{iFCP_EOFn, "EOFn" },
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{iFCP_EOFt, "EOFt" },
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{iFCP_EOFrt, "EOFrt" },
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{iFCP_EOFdt, "EOFdt" },
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{iFCP_EOFni, "EOFni" },
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{iFCP_EOFdti, "EOFdti" },
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{iFCP_EOFrti, "EOFrti" },
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{iFCP_EOFa, "EOFa" },
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{0, NULL},
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};
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static const value_string ifcp_sof_vals[] = {
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{iFCP_SOFf, "SOFf" },
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{iFCP_SOFi4, "SOFi4" },
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{iFCP_SOFi2, "SOFi2" },
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{iFCP_SOFi3, "SOFi3" },
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{iFCP_SOFn4, "SOFn4" },
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{iFCP_SOFn2, "SOFn2" },
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{iFCP_SOFn3, "SOFn3" },
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{iFCP_SOFc4, "SOFc4" },
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{0, NULL},
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};
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static const value_string fcencap_proto_vals[] = {
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{FCENCAP_PROTO_iFCP, "iFCP"},
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{FCENCAP_PROTO_iFCP, "iFCP"},
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{0, NULL},
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};
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static const guint8 ifcp_header_8_bytes[8] = {
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0x02, 0x01, 0xFD, 0xFE,
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0x00, 0x00, 0x00, 0x00
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};
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static int proto_ifcp = -1;
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static int hf_ifcp_protocol = -1;
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static int hf_ifcp_protocol_c = -1;
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static int hf_ifcp_version = -1;
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static int hf_ifcp_version_c = -1;
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static int hf_ifcp_encap_flags = -1;
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static int hf_ifcp_encap_flags_c=-1;
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static int hf_ifcp_framelen = -1;
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static int hf_ifcp_framelen_c = -1;
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static int hf_ifcp_tsec = -1;
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static int hf_ifcp_tusec = -1;
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static int hf_ifcp_encap_crc = -1;
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static int hf_ifcp_sof = -1;
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static int hf_ifcp_sof_c = -1;
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static int hf_ifcp_eof = -1;
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static int hf_ifcp_eof_c = -1;
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static int hf_ifcp_ls_command_acc = -1;
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static int hf_ifcp_flags_ses = -1;
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static int hf_ifcp_flags_trp = -1;
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static int hf_ifcp_flags_spc = -1;
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static int ett_ifcp = -1;
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static guint ifcp_port = 3420;
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static gboolean ifcp_desegment = TRUE;
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static dissector_handle_t data_handle;
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static dissector_handle_t fc_handle;
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/* This routine attempts to locate the position of the next header in the
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* provided segment
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*/
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static guint
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get_next_ifcp_header_offset (tvbuff_t *tvb, packet_info *pinfo, gint offset)
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{
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gint bytes_remaining = tvb_length_remaining (tvb, offset);
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gint frame_len;
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guint16 flen, flen1;
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/*
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* As per the iFCP standard, the following tests must PASS:
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* 1) Frame Length field validation -- 15 < Frame Length < 545;
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* 2) Comparison of Frame Length field to its ones complement; and
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* 3) A valid EOF is found in the word preceding the start of the next
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* iFCP header as indicated by the Frame Length field, to be tested
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* as follows:
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* 1) Bits 24-31 and 16-23 contain identical legal EOF values (the
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* list of legal EOF values is in the FC Frame Encapsulation
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* [21]); and
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* 2) Bits 8-15 and 0-7 contain the ones complement of the EOF
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* value found in bits 24-31.
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*
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* As per the iFCP standard, in addition, at least 3 of the following set
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* of tests must be performed to identify that we've located the start of
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* an iFCP frame.
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* a) Protocol# ones complement field (1 test);
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* b) Version ones complement field (1 test);
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* c) Replication of encapsulation word 0 in word 1 (1 test);
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* d) Reserved field and its ones complement (2 tests);
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* e) Flags field and its ones complement (2 tests);
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* f) CRC field is equal to zero (1 test); (DONT DO THIS TEST!)
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* g) SOF fields and ones complement fields (4 tests);
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* h) Format and values of FC header (1 test);
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* i) CRC of FC Frame (2 tests);
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* j) FC Frame Encapsulation header information in the next iFCP Frame
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* (1 test).
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*
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* At least 3 of the 16 tests listed above SHALL be performed. Failure
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* of any of the above tests actually performed SHALL indicate an
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* encapsulation error and the FC Frame SHALL NOT be forwarded on to
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* the FC Entity.
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*/
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NXT_BYTE: while (bytes_remaining) {
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if (bytes_remaining < iFCP_ENCAP_HEADER_LEN) {
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if(ifcp_desegment && pinfo->can_desegment) {
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/*
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* This frame doesn't have all of the data for
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* this message, but we can do reassembly on it.
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*
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* Tell the TCP dissector where the data for this
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* message starts in the data it handed us, and
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* how many more bytes we need, and return.
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*/
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pinfo->desegment_offset = offset;
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pinfo->desegment_len = iFCP_ENCAP_HEADER_LEN;
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return -2;
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}
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}
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/* I check that we have a valid header before checking for the frame
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* length and the other initial tests.
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*/
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/*
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* Tests a, b and c
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*/
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if (tvb_memeql(tvb, offset, ifcp_header_8_bytes, 8) != 0) {
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offset++;
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bytes_remaining--;
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goto NXT_BYTE;
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}
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flen = (tvb_get_ntohs (tvb, offset+12)) & 0x03FF;
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frame_len = (tvb_get_ntohs (tvb, offset+12) & 0x03FF)*4;
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if ((flen < 15) || (flen > 545)) {
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/* Frame length check failed. Skip byte and try again */
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offset++;
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bytes_remaining--;
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goto NXT_BYTE;
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}
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flen1 = (tvb_get_ntohs (tvb, offset+14)) & 0x03FF;
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if ((flen & 0x03FF) != ((~flen1)&0x03FF)) {
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/* frame_len and its one's complement are not the same */
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offset++;
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bytes_remaining--;
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goto NXT_BYTE;
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}
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if (bytes_remaining >= (frame_len)) {
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if (tvb_bytes_exist (tvb, offset+frame_len, 8)) {
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/* The start of the next header matches what we wish to see */
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if (tvb_memeql (tvb, offset+frame_len, ifcp_header_8_bytes,
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8) == 0) {
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return (offset);
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}
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else {
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offset++;
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bytes_remaining--;
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goto NXT_BYTE;
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}
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}
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else {
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return (offset);
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}
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}
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else {
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if(ifcp_desegment && pinfo->can_desegment) {
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/*
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* This frame doesn't have all of the data for
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* this message, but we can do reassembly on it.
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*
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* Tell the TCP dissector where the data for this
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* message starts in the data it handed us, and
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* how many more bytes we need, and return.
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*/
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pinfo->desegment_offset = offset;
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pinfo->desegment_len = frame_len - bytes_remaining;
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return -2;
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}
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else {
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return (offset);
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}
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}
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}
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return (-1); /* Unable to find iFCP header */
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}
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static void
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dissect_fcencap_header (tvbuff_t *tvb, proto_tree *tree, gint offset)
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{
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guint8 protocol = tvb_get_guint8 (tvb, offset);
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if (tree) {
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proto_tree_add_uint (tree, hf_ifcp_protocol, tvb, offset, 1, protocol);
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proto_tree_add_item (tree, hf_ifcp_version, tvb, offset+1, 1, 0);
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proto_tree_add_item (tree, hf_ifcp_protocol_c, tvb, offset+2, 1, 0);
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proto_tree_add_item (tree, hf_ifcp_version_c, tvb, offset+3, 1, 0);
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if (protocol == FCENCAP_PROTO_iFCP) {
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proto_tree_add_item (tree, hf_ifcp_ls_command_acc, tvb, offset+8, 1, 0);
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proto_tree_add_item (tree, hf_ifcp_flags_ses, tvb, offset+9, 1, 0);
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proto_tree_add_item (tree, hf_ifcp_flags_trp, tvb, offset+9, 1, 0);
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proto_tree_add_item (tree, hf_ifcp_flags_spc, tvb, offset+9, 1, 0);
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proto_tree_add_item (tree, hf_ifcp_sof, tvb, offset+10, 1, 0);
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proto_tree_add_item (tree, hf_ifcp_eof, tvb, offset+11, 1, 0);
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}
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/* XXX - break out CRCV flag. */
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proto_tree_add_item (tree, hf_ifcp_encap_flags, tvb, offset+12, 1, 0);
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proto_tree_add_item (tree, hf_ifcp_framelen, tvb, offset+12, 2, 0);
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proto_tree_add_item (tree, hf_ifcp_encap_flags_c, tvb, offset+14, 1, 0);
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proto_tree_add_item (tree, hf_ifcp_framelen_c, tvb, offset+14, 2, 0);
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proto_tree_add_item (tree, hf_ifcp_tsec, tvb, offset+16, 4, 0);
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proto_tree_add_item (tree, hf_ifcp_tusec, tvb, offset+20, 4, 0);
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/* XXX - check CRC if CRCV is set? */
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proto_tree_add_item (tree, hf_ifcp_encap_crc, tvb, offset+24, 4, 0);
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}
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}
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static gboolean
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dissect_ifcp (tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
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gboolean check_port)
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{
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gint offset = 0,
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frame_len = 0;
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gint bytes_remaining = tvb_length_remaining (tvb, offset);
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guint8 sof = 0, eof = 0;
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/* Set up structures needed to add the protocol subtree and manage it */
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proto_item *ti;
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proto_tree *ifcp_tree = NULL;
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tvbuff_t *next_tvb;
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if (bytes_remaining < iFCP_ENCAP_HEADER_LEN) {
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return FALSE;
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}
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if (check_port &&
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((pinfo->srcport != ifcp_port) && (pinfo->destport != ifcp_port))) {
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return FALSE;
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}
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while (bytes_remaining > iFCP_ENCAP_HEADER_LEN) {
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if ((offset = get_next_ifcp_header_offset (tvb, pinfo, offset)) == -1) {
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return FALSE;
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}
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else if (offset == -2) {
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/* We need more data to desegment */
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return (TRUE);
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}
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if (check_col(pinfo->cinfo, COL_PROTOCOL))
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "iFCP");
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frame_len = (tvb_get_ntohs (tvb, offset+12) & 0x03FF)*4;
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if (bytes_remaining < frame_len) {
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if(ifcp_desegment && pinfo->can_desegment) {
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/*
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* This frame doesn't have all of the data for
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* this message, but we can do reassembly on it.
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*
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* Tell the TCP dissector where the data for this
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* message starts in the data it handed us, and
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* how many more bytes we need, and return.
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*/
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pinfo->desegment_offset = offset;
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pinfo->desegment_len = frame_len - bytes_remaining;
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return (TRUE);
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}
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}
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if (tree) {
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if (tvb_bytes_exist (tvb, offset, frame_len-4)) {
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sof = tvb_get_guint8 (tvb, offset+iFCP_ENCAP_HEADER_LEN);
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eof = tvb_get_guint8 (tvb, offset+frame_len - 4);
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ti = proto_tree_add_protocol_format (tree, proto_ifcp, tvb, offset,
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iFCP_ENCAP_HEADER_LEN,
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"iFCP (%s/%s)",
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val_to_str (sof, ifcp_sof_vals,
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"0x%x"),
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val_to_str (eof, ifcp_eof_vals,
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"0x%x"));
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}
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else {
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sof = tvb_get_guint8 (tvb, offset+iFCP_ENCAP_HEADER_LEN);
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ti = proto_tree_add_protocol_format (tree, proto_ifcp, tvb, offset,
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iFCP_ENCAP_HEADER_LEN,
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"iFCP (%s/%s)",
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val_to_str (sof, ifcp_sof_vals,
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"0x%x"),
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"NA");
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}
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ifcp_tree = proto_item_add_subtree (ti, ett_ifcp);
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/* Dissect the Common FC Encap header */
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dissect_fcencap_header (tvb, ifcp_tree, offset);
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/* print SOF */
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proto_tree_add_item (ifcp_tree, hf_ifcp_sof, tvb, offset+iFCP_ENCAP_HEADER_LEN, 1, 0);
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proto_tree_add_item (ifcp_tree, hf_ifcp_sof_c, tvb, offset+iFCP_ENCAP_HEADER_LEN+2, 1, 0);
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/* print EOF */
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if (tvb_bytes_exist (tvb, offset, 4)) {
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proto_tree_add_item (ifcp_tree, hf_ifcp_eof, tvb, offset+frame_len-4, 1, 0);
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proto_tree_add_item (ifcp_tree, hf_ifcp_eof_c, tvb, offset+frame_len-2, 1, 0);
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}
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}
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/* Call the FC Dissector if this is carrying an FC frame */
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/* Set the SOF/EOF flags in the packet_info header */
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pinfo->sof_eof = 0;
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if (sof) {
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if ((sof == iFCP_SOFi3) || (sof == iFCP_SOFi2) || (sof == iFCP_SOFi4)) {
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pinfo->sof_eof = PINFO_SOF_FIRST_FRAME;
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}
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else if (sof == iFCP_SOFf) {
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pinfo->sof_eof = PINFO_SOF_SOFF;
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}
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if (eof != iFCP_EOFn) {
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pinfo->sof_eof |= PINFO_EOF_LAST_FRAME;
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}
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else if (eof != iFCP_EOFt) {
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pinfo->sof_eof |= PINFO_EOF_INVALID;
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}
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}
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next_tvb = tvb_new_subset (tvb, offset+iFCP_ENCAP_HEADER_LEN+4, frame_len-iFCP_ENCAP_HEADER_LEN-8, frame_len-iFCP_ENCAP_HEADER_LEN-8);
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if (fc_handle) {
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call_dissector (fc_handle, next_tvb, pinfo, tree);
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}
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else if (data_handle) {
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call_dissector (data_handle, next_tvb, pinfo, tree);
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}
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offset += frame_len;
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bytes_remaining -= frame_len;
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}
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return (TRUE);
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}
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/* This is called for those sessions where we have explicitely said
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this to be iFCP using "Decode As..."
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In this case we will not check the port number for sanity and just
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do as the user said.
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*/
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static void
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dissect_ifcp_handle(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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dissect_ifcp (tvb, pinfo, tree, FALSE);
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}
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static gboolean
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dissect_ifcp_heur (tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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return (dissect_ifcp (tvb, pinfo, tree, TRUE));
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}
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void
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proto_register_ifcp (void)
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{
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/* Setup list of header fields See Section 1.6.1 for details*/
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static hf_register_info hf[] = {
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{ &hf_ifcp_protocol,
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{ "Protocol", "fcencap.proto", FT_UINT8, BASE_DEC,
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VALS(fcencap_proto_vals), 0, "Protocol", HFILL }},
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{ &hf_ifcp_protocol_c,
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{"Protocol (1's Complement)", "fcencap.protoc", FT_UINT8, BASE_DEC, NULL,
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0, "Protocol (1's Complement)", HFILL}},
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{ &hf_ifcp_version,
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{"Version", "fcencap.version", FT_UINT8, BASE_DEC, NULL, 0, "",
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HFILL}},
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{ &hf_ifcp_version_c,
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{"Version (1's Complement)", "fcencap.versionc", FT_UINT8, BASE_DEC,
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NULL, 0, "", HFILL}},
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{ &hf_ifcp_encap_flags,
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{"iFCP Encapsulation Flags", "ifcp.encap_flags", FT_UINT8, BASE_HEX, NULL, 0xFC, "", HFILL}},
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{ &hf_ifcp_encap_flags_c,
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{"iFCP Encapsulation Flags (1's Complement)", "ifcp.encap_flagsc", FT_UINT8, BASE_HEX,
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NULL, 0xFC, "", HFILL}},
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{ &hf_ifcp_framelen,
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{"Frame Length (in Words)", "fcencap.framelen", FT_UINT16, BASE_DEC,
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NULL, 0x03FF, "", HFILL}},
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{ &hf_ifcp_framelen_c,
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{"Frame Length (1's Complement)", "fcencap.framelenc", FT_UINT16,
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BASE_DEC, NULL, 0x03FF, "", HFILL}},
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{ &hf_ifcp_tsec,
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{"Time (secs)", "fcencap.tsec", FT_UINT32, BASE_DEC, NULL, 0, "",
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HFILL}},
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{ &hf_ifcp_tusec,
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{"Time (fraction)", "fcencap.tusec", FT_UINT32, BASE_DEC, NULL, 0,
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"", HFILL}},
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{ &hf_ifcp_encap_crc,
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{"CRC", "fcencap.crc", FT_UINT32, BASE_HEX, NULL, 0, "", HFILL}},
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{ &hf_ifcp_sof,
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{"SOF", "ifcp.sof", FT_UINT8, BASE_HEX, VALS (&ifcp_sof_vals), 0,
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"", HFILL}},
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{ &hf_ifcp_eof,
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{"EOF", "ifcp.eof", FT_UINT8, BASE_HEX, VALS (&ifcp_eof_vals), 0,
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"", HFILL}},
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{ &hf_ifcp_sof_c,
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{"SOF Compliment", "ifcp.sof_c", FT_UINT8, BASE_HEX, NULL , 0,
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"", HFILL}},
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{ &hf_ifcp_eof_c,
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{"EOF Compliment", "ifcp.eof_c", FT_UINT8, BASE_HEX, NULL , 0,
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"", HFILL}},
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|
{ &hf_ifcp_ls_command_acc,
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{"Ls Command Acc", "ifcp.ls_command_acc", FT_UINT8, BASE_HEX, NULL, 0,
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"", HFILL}},
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{ &hf_ifcp_flags_ses,
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{"SES", "ifcp.flags.ses", FT_BOOLEAN, 8 , NULL, 0x04, "Is this a Session control frame", HFILL }},
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{ &hf_ifcp_flags_trp,
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{"TRP", "ifcp.flags.trp", FT_BOOLEAN, 8 , NULL, 0x02, "Is address transparent mode enabled", HFILL }},
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{ &hf_ifcp_flags_spc,
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{"SPC", "ifcp.flags.spc", FT_BOOLEAN, 8 , NULL, 0x01, "Is frame part of link service", HFILL }},
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};
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|
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static gint *ett[] = {
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&ett_ifcp,
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};
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|
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module_t *ifcp_module;
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|
|
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/* Register the protocol name and description */
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proto_ifcp = proto_register_protocol("iFCP", "iFCP", "ifcp");
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|
|
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/* Required function calls to register the header fields and
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* subtrees used */
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proto_register_field_array(proto_ifcp, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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|
|
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ifcp_module = prefs_register_protocol(proto_ifcp, NULL);
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prefs_register_bool_preference(ifcp_module,
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"desegment",
|
|
"Reassemble iFCP messages spanning multiple TCP segments",
|
|
"Whether the iFCP dissector should reassemble messages spanning multiple TCP segments."
|
|
" To use this option, you must also enable \"Allow subdissectors to reassemble TCP streams\" in the TCP protocol settings.",
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|
&ifcp_desegment);
|
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prefs_register_uint_preference(ifcp_module,
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"target_port",
|
|
"Target port",
|
|
"Port number used for iFCP",
|
|
10,
|
|
&ifcp_port);
|
|
}
|
|
|
|
|
|
/*
|
|
* If this dissector uses sub-dissector registration add a
|
|
* registration routine.
|
|
*/
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|
|
|
/*
|
|
* This format is required because a script is used to find these
|
|
* routines and create the code that calls these routines.
|
|
*/
|
|
void
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|
proto_reg_handoff_ifcp (void)
|
|
{
|
|
dissector_handle_t ifcp_handle;
|
|
|
|
heur_dissector_add("tcp", dissect_ifcp_heur, proto_ifcp);
|
|
|
|
ifcp_handle = create_dissector_handle(dissect_ifcp_handle, proto_ifcp);
|
|
dissector_add_handle("tcp.port", ifcp_handle);
|
|
|
|
data_handle = find_dissector("data");
|
|
fc_handle = find_dissector("fc_ifcp");
|
|
}
|