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wireshark/packet-sna.c

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/* packet-sna.c
* Routines for SNA
* Gilbert Ramirez <gram@xiexie.org>
*
* $Id: packet-sna.c,v 1.1 1999/10/12 06:20:17 gram Exp $
*
* Ethereal - Network traffic analyzer
* By Gerald Combs <gerald@unicom.net>
* 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
#ifdef HAVE_SYS_TYPES_H
# include <sys/types.h>
#endif
#include <glib.h>
#include "packet.h"
/*
* http://www.wanresources.com/snacell.html
*
*/
static int proto_sna = -1;
static int hf_sna_th = -1;
static int hf_sna_th_0 = -1;
static int hf_sna_th_fid = -1;
static int hf_sna_th_mpf = -1;
static int hf_sna_th_odai = -1;
static int hf_sna_th_efi = -1;
static int hf_sna_th_daf = -1;
static int hf_sna_th_oaf = -1;
static int hf_sna_th_snf = -1;
static int hf_sna_th_dcf = -1;
static int hf_sna_th_lsid = -1;
static int hf_sna_rh = -1;
static int hf_sna_rh_0 = -1;
static int hf_sna_rh_1 = -1;
static int hf_sna_rh_2 = -1;
static int hf_sna_rh_rri = -1;
static int hf_sna_rh_ru_category = -1;
static int hf_sna_rh_fi = -1;
static int hf_sna_rh_sdi = -1;
static int hf_sna_rh_bci = -1;
static int hf_sna_rh_eci = -1;
static int hf_sna_rh_dr1 = -1;
static int hf_sna_rh_lcci = -1;
static int hf_sna_rh_dr2 = -1;
static int hf_sna_rh_eri = -1;
static int hf_sna_rh_rti = -1;
static int hf_sna_rh_rlwi = -1;
static int hf_sna_rh_qri = -1;
static int hf_sna_rh_pi = -1;
static int hf_sna_rh_bbi = -1;
static int hf_sna_rh_ebi = -1;
static int hf_sna_rh_cdi = -1;
static int hf_sna_rh_csi = -1;
static int hf_sna_rh_edi = -1;
static int hf_sna_rh_pdi = -1;
static int hf_sna_rh_cebi = -1;
static int hf_sna_ru = -1;
/* Format Identifier */
static const value_string sna_th_fid_vals[] = {
{ 0x0, "SNA device <--> Non-SNA Device" },
{ 0x1, "Subarea Node <--> Subarea Node" },
{ 0x2, "Subarea Node <--> PU2" },
{ 0x3, "Subarea Node or SNA host <--> Subarea Node" },
{ 0x4, "?" },
{ 0x5, "?" },
{ 0xf, "Adjaced Subarea Nodes" },
{ 0x0, NULL }
};
/* Mapping Field */
static const value_string sna_th_mpf_vals[] = {
{ 0, "Middle segment of a BIU" },
{ 1, "Last segment of a BIU" },
{ 2, "First segment of a BIU" },
{ 3 , "Whole BIU" },
{ 0, NULL }
};
/* Expedited Flow Indicator */
static const value_string sna_th_efi_vals[] = {
{ 0, "Normal Flow" },
{ 1, "Expedited Flow" }
};
/* Request/Response Indicator */
static const value_string sna_rh_rri_vals[] = {
{ 0, "Request" },
{ 1, "Response" }
};
/* Request/Response Unit Category */
static const value_string sna_rh_ru_category_vals[] = {
{ 0x00, "Function Management Data (FMD)" },
{ 0x01, "Network Control (NC)" },
{ 0x10, "Data Flow Control (DFC)" },
{ 0x11, "Session Control (SC)" },
};
/* Format Indicator */
static const true_false_string sna_rh_fi_truth =
{ "FM Header", "No FM Header" };
/* Sense Data Included */
static const true_false_string sna_rh_sdi_truth =
{ "Included", "Not Included" };
/* Begin Chain Indicator */
static const true_false_string sna_rh_bci_truth =
{ "First in Chain", "Not First in Chain" };
/* End Chain Indicator */
static const true_false_string sna_rh_eci_truth =
{ "Last in Chain", "Not Last in Chain" };
/* Lengith-Checked Compression Indicator */
static const true_false_string sna_rh_lcci_truth =
{ "Compressed", "Not Compressed" };
/* Response Type Indicator */
static const true_false_string sna_rh_rti_truth =
{ "Negative", "Positive" };
/* Exception Response Indicator */
static const true_false_string sna_rh_eri_truth =
{ "Exception", "Definite" };
/* Queued Response Indicator */
static const true_false_string sna_rh_qri_truth =
{ "Enqueue response in TC queues", "Response bypasses TC queues" };
/* Code Selection Indicator */
static const value_string sna_rh_csi_vals[] = {
{ 0, "EBCDIC" },
{ 1, "ASCII" }
};
static int dissect_fid0_1 (const u_char*, int, frame_data*, proto_tree*);
static int dissect_fid2 (const u_char*, int, frame_data*, proto_tree*);
static int dissect_fid3 (const u_char*, int, frame_data*, proto_tree*);
static void dissect_rh (const u_char*, int, frame_data*, proto_tree*);
void
dissect_sna(const u_char *pd, int offset, frame_data *fd, proto_tree *tree) {
proto_tree *sna_tree = NULL, *th_tree = NULL, *rh_tree = NULL;
proto_item *sna_ti, *th_ti, *rh_ti;
guint8 th_fid;
int sna_header_len = 0, th_header_len = 0;
if (IS_DATA_IN_FRAME(offset)) {
/* Transmission Header Format Identifier */
th_fid = hi_nibble(pd[offset]);
}
else {
/* If our first byte isn't here, stop dissecting */
return;
}
/* Summary information */
if (check_col(fd, COL_PROTOCOL))
col_add_str(fd, COL_PROTOCOL, "SNA");
if (check_col(fd, COL_INFO))
col_add_str(fd, COL_INFO, val_to_str(th_fid, sna_th_fid_vals, "Unknown FID: %01x"));
if (tree) {
/* Don't bother setting length. We'll set it later after we find
* the lengths of TH/RH/RU */
sna_ti = proto_tree_add_item(tree, proto_sna, offset, 0, NULL);
sna_tree = proto_item_add_subtree(sna_ti, ETT_SNA);
/* --- TH --- */
/* Don't bother setting length. We'll set it later after we find
* the length of TH */
th_ti = proto_tree_add_item(sna_tree, hf_sna_th, offset, 0, NULL);
th_tree = proto_item_add_subtree(th_ti, ETT_SNA_TH);
switch(th_fid) {
case 0x0:
case 0x1:
th_header_len = dissect_fid0_1(pd, offset, fd, th_tree);
break;
case 0x2:
th_header_len = dissect_fid2(pd, offset, fd, th_tree);
break;
case 0x3:
th_header_len = dissect_fid3(pd, offset, fd, th_tree);
break;
default:
dissect_data(pd, offset+1, fd, tree);
}
sna_header_len += th_header_len;
offset += th_header_len;
proto_item_set_len(th_ti, th_header_len);
/* --- RH --- */
if (BYTES_ARE_IN_FRAME(offset, 3)) {
rh_ti = proto_tree_add_item(sna_tree, hf_sna_rh, offset, 3, NULL);
rh_tree = proto_item_add_subtree(rh_ti, ETT_SNA_RH);
dissect_rh(pd, offset, fd, rh_tree);
sna_header_len += 3;
offset += 3;
}
else {
/* If our first byte isn't here, stop dissecting */
return;
}
proto_item_set_len(sna_ti, sna_header_len);
}
if (IS_DATA_IN_FRAME(offset+1)) {
dissect_data(pd, offset, fd, tree);
}
}
/* FID Types 0 and 1 */
static int
dissect_fid0_1 (const u_char *pd, int offset, frame_data *fd, proto_tree *tree) {
proto_tree *bf_tree;
proto_item *bf_item;
guint8 th_0;
guint16 daf, oaf, snf, dcf;
static int bytes_in_header = 10;
if (!BYTES_ARE_IN_FRAME(offset, bytes_in_header)) {
return 0;
}
th_0 = pd[offset+0];
daf = pntohs(&pd[offset+2]);
oaf = pntohs(&pd[offset+4]);
snf = pntohs(&pd[offset+6]);
dcf = pntohs(&pd[offset+8]);
/* Create the bitfield tree */
bf_item = proto_tree_add_item(tree, hf_sna_th_0, offset, 1, th_0);
bf_tree = proto_item_add_subtree(bf_item, ETT_SNA_TH_FID);
proto_tree_add_item(bf_tree, hf_sna_th_fid, offset, 1, th_0);
proto_tree_add_item(bf_tree, hf_sna_th_mpf, offset, 1, th_0);
proto_tree_add_item(bf_tree, hf_sna_th_efi ,offset, 1, th_0);
proto_tree_add_text(tree, offset+1, 1, "Reserved");
proto_tree_add_item(tree, hf_sna_th_daf ,offset+2, 1, daf);
proto_tree_add_item(tree, hf_sna_th_oaf ,offset+4, 1, oaf);
proto_tree_add_item(tree, hf_sna_th_snf ,offset+6, 2, snf);
proto_tree_add_item(tree, hf_sna_th_dcf ,offset+8, 2, dcf);
if (check_col(fd, COL_RES_DL_DST))
col_add_fstr(fd, COL_RES_DL_DST, "%02X", daf);
if (check_col(fd, COL_RES_DL_SRC))
col_add_fstr(fd, COL_RES_DL_SRC, "%02X", oaf);
return bytes_in_header;
}
/* FID Type 2 */
static int
dissect_fid2 (const u_char *pd, int offset, frame_data *fd, proto_tree *tree) {
proto_tree *bf_tree;
proto_item *bf_item;
guint8 th_0, daf, oaf;
guint16 snf;
static int bytes_in_header = 6;
if (!BYTES_ARE_IN_FRAME(offset, bytes_in_header)) {
return 0;
}
th_0 = pd[offset+0];
daf = pd[offset+2];
oaf = pd[offset+3];
snf = pntohs(&pd[offset+4]);
/* Create the bitfield tree */
bf_item = proto_tree_add_item(tree, hf_sna_th_0, offset, 1, th_0);
bf_tree = proto_item_add_subtree(bf_item, ETT_SNA_TH_FID);
proto_tree_add_item(bf_tree, hf_sna_th_fid, offset, 1, th_0);
proto_tree_add_item(bf_tree, hf_sna_th_mpf, offset, 1, th_0);
proto_tree_add_item(bf_tree, hf_sna_th_odai ,offset, 1, th_0);
proto_tree_add_item(bf_tree, hf_sna_th_efi ,offset, 1, th_0);
proto_tree_add_text(tree, offset+1, 1, "Reserved");
proto_tree_add_item(tree, hf_sna_th_daf ,offset+2, 1, daf);
proto_tree_add_item(tree, hf_sna_th_oaf ,offset+3, 1, oaf);
proto_tree_add_item(tree, hf_sna_th_snf ,offset+4, 2, snf);
if (check_col(fd, COL_RES_DL_DST))
col_add_fstr(fd, COL_RES_DL_DST, "%02X", daf);
if (check_col(fd, COL_RES_DL_SRC))
col_add_fstr(fd, COL_RES_DL_SRC, "%02X", oaf);
return bytes_in_header;
}
/* FID Type 3 */
static int
dissect_fid3 (const u_char *pd, int offset, frame_data *fd, proto_tree *tree) {
proto_tree *bf_tree;
proto_item *bf_item;
guint8 th_0;
guint8 lsid;
static int bytes_in_header = 2;
if (!BYTES_ARE_IN_FRAME(offset, bytes_in_header)) {
return 0;
}
th_0 = pd[offset+0];
lsid = pd[offset+1];
/* Create the bitfield tree */
bf_item = proto_tree_add_item(tree, hf_sna_th_0, offset, 1, th_0);
bf_tree = proto_item_add_subtree(bf_item, ETT_SNA_TH_FID);
proto_tree_add_item(bf_tree, hf_sna_th_fid, offset, 1, th_0);
proto_tree_add_item(bf_tree, hf_sna_th_mpf, offset, 1, th_0);
proto_tree_add_item(bf_tree, hf_sna_th_efi ,offset, 1, th_0);
proto_tree_add_item(tree, hf_sna_th_lsid ,offset+1, 1, lsid);
return bytes_in_header;
}
/* RH */
static void
dissect_rh (const u_char *pd, int offset, frame_data *fd, proto_tree *tree) {
proto_tree *bf_tree;
proto_item *bf_item;
gboolean is_response;
guint8 rh_0, rh_1, rh_2;
rh_0 = pd[offset+0];
rh_1 = pd[offset+1];
rh_2 = pd[offset+2];
is_response = (rh_0 & 0x80);
/* Create the bitfield tree for byte 0*/
bf_item = proto_tree_add_item(tree, hf_sna_rh_0, offset, 1, rh_0);
bf_tree = proto_item_add_subtree(bf_item, ETT_SNA_RH_0);
proto_tree_add_item(bf_tree, hf_sna_rh_rri, offset, 1, rh_0);
proto_tree_add_item(bf_tree, hf_sna_rh_ru_category, offset, 1, rh_0);
proto_tree_add_item(bf_tree, hf_sna_rh_fi, offset, 1, rh_0);
proto_tree_add_item(bf_tree, hf_sna_rh_sdi, offset, 1, rh_0);
if (is_response) {
proto_tree_add_item(bf_tree, hf_sna_rh_bci, offset, 1, rh_0);
proto_tree_add_item(bf_tree, hf_sna_rh_eci, offset, 1, rh_0);
}
offset += 1;
/* Create the bitfield tree for byte 1*/
bf_item = proto_tree_add_item(tree, hf_sna_rh_1, offset, 1, rh_1);
bf_tree = proto_item_add_subtree(bf_item, ETT_SNA_RH_1);
proto_tree_add_item(bf_tree, hf_sna_rh_dr1, offset, 1, rh_1);
if (!is_response) {
proto_tree_add_item(bf_tree, hf_sna_rh_lcci, offset, 1, rh_1);
}
proto_tree_add_item(bf_tree, hf_sna_rh_dr2, offset, 1, rh_1);
if (is_response) {
proto_tree_add_item(bf_tree, hf_sna_rh_rti, offset, 1, rh_1);
}
else {
proto_tree_add_item(bf_tree, hf_sna_rh_eri, offset, 1, rh_1);
proto_tree_add_item(bf_tree, hf_sna_rh_rlwi, offset, 1, rh_1);
}
proto_tree_add_item(bf_tree, hf_sna_rh_qri, offset, 1, rh_1);
proto_tree_add_item(bf_tree, hf_sna_rh_pi, offset, 1, rh_1);
offset += 1;
/* Create the bitfield tree for byte 2*/
bf_item = proto_tree_add_item(tree, hf_sna_rh_2, offset, 1, rh_2);
if (!is_response) {
bf_tree = proto_item_add_subtree(bf_item, ETT_SNA_RH_2);
proto_tree_add_item(bf_tree, hf_sna_rh_bbi, offset, 1, rh_2);
proto_tree_add_item(bf_tree, hf_sna_rh_ebi, offset, 1, rh_2);
proto_tree_add_item(bf_tree, hf_sna_rh_cdi, offset, 1, rh_2);
proto_tree_add_item(bf_tree, hf_sna_rh_csi, offset, 1, rh_2);
proto_tree_add_item(bf_tree, hf_sna_rh_edi, offset, 1, rh_2);
proto_tree_add_item(bf_tree, hf_sna_rh_pdi, offset, 1, rh_2);
proto_tree_add_item(bf_tree, hf_sna_rh_cebi, offset, 1, rh_2);
}
/* XXX - check for sdi. If TRUE, the next 4 bytes will be sense data */
}
void
proto_register_sna(void)
{
static hf_register_info hf[] = {
{ &hf_sna_th,
{ "Transmission Header", "sna.th", FT_NONE, BASE_NONE, NULL, 0x0,
"" }},
{ &hf_sna_th_0,
{ "Transmission Header Byte 0", "sna.th.0", FT_UINT8, BASE_HEX, NULL, 0x0,
"Byte 0 of Tranmission Header contains FID, MPF, ODAI,"
" and EFI as bitfields." }},
{ &hf_sna_th_fid,
{ "Format Identifer", "sna.th.fid", FT_UINT8, BASE_HEX, VALS(sna_th_fid_vals), 0xf0,
"Format Identification" }},
{ &hf_sna_th_mpf,
{ "Mapping Field", "sna.th.mpf", FT_UINT8, BASE_NONE, VALS(sna_th_mpf_vals), 0x0c,
"The Mapping Field specifies whether the information field"
" associated with the TH is a complete or partial BIU." }},
{ &hf_sna_th_odai,
{ "ODAI Assignment Indicator", "sna.th.odai", FT_UINT8, BASE_DEC, NULL, 0x02,
"The ODAI indicates which node assigned the OAF'-DAF' values"
" carried in the TH." }},
{ &hf_sna_th_efi,
{ "Expedited Flow Indicator", "sna.th.efi", FT_UINT8, BASE_DEC, VALS(sna_th_efi_vals), 0x01,
"The EFI designates whether the PIU belongs to the normal"
" or expedited flow." }},
{ &hf_sna_th_daf,
{ "Destination Address Field", "sna.th.daf", FT_UINT16, BASE_HEX, NULL, 0x0,
"" }},
{ &hf_sna_th_oaf,
{ "Origin Address Field", "sna.th.oaf", FT_UINT16, BASE_HEX, NULL, 0x0,
"" }},
{ &hf_sna_th_snf,
{ "Sequence Number Field", "sna.th.snf", FT_UINT16, BASE_NONE, NULL, 0x0,
"The Sequence Number Field contains a numerical identifier for"
" the associated BIU."}},
{ &hf_sna_th_dcf,
{ "Data Count Field", "sna.th.dcf", FT_UINT16, BASE_DEC, NULL, 0x0,
"A binary count of the number of bytes in the BIU or BIU segment associated "
"with the tranmission header. The count does not include any of the bytes "
"in the transmission header."}},
{ &hf_sna_th_lsid,
{ "Local Session Identification", "sna.th.lsid", FT_UINT8, BASE_HEX, NULL, 0x0,
"" }},
{ &hf_sna_rh,
{ "Request/Response Header", "sna.rh", FT_NONE, BASE_NONE, NULL, 0x0,
"" }},
{ &hf_sna_rh_0,
{ "Request/Response Header Byte 0", "sna.rh.0", FT_UINT8, BASE_HEX, NULL, 0x0,
"" }},
{ &hf_sna_rh_1,
{ "Request/Response Header Byte 1", "sna.rh.1", FT_UINT8, BASE_HEX, NULL, 0x0,
"" }},
{ &hf_sna_rh_2,
{ "Request/Response Header Byte 2", "sna.rh.2", FT_UINT8, BASE_HEX, NULL, 0x0,
"" }},
{ &hf_sna_rh_rri,
{ "Request/Response Indicator", "sna.rh.rri", FT_UINT8, BASE_DEC, VALS(sna_rh_rri_vals), 0x80,
"Denotes whether this is a request or a response." }},
{ &hf_sna_rh_ru_category,
{ "Request/Response Unit Category", "sna.rh.ru_category", FT_UINT8, BASE_HEX,
VALS(sna_rh_ru_category_vals), 0x60,
"" }},
{ &hf_sna_rh_fi,
{ "Format Indicator", "sna.rh.fi", FT_BOOLEAN, 8, TFS(&sna_rh_fi_truth), 0x08,
"" }},
{ &hf_sna_rh_sdi,
{ "Sense Data Included", "sna.rh.sdi", FT_BOOLEAN, 8, TFS(&sna_rh_sdi_truth), 0x04,
"Indicates that a 4-byte sense data field is included in the associated RU." }},
{ &hf_sna_rh_bci,
{ "Begin Chain Indicator", "sna.rh.bci", FT_BOOLEAN, 8, TFS(&sna_rh_bci_truth), 0x02,
"" }},
{ &hf_sna_rh_eci,
{ "End Chain Indicator", "sna.rh.eci", FT_BOOLEAN, 8, TFS(&sna_rh_eci_truth), 0x01,
"" }},
{ &hf_sna_rh_dr1,
{ "Definite Response 1 Indicator", "sna.rh.dr1", FT_BOOLEAN, 8, NULL, 0x80,
"" }},
{ &hf_sna_rh_lcci,
{ "Length-Checked Compression Indicator", "sna.rh.lcci", FT_BOOLEAN, 8,
TFS(&sna_rh_lcci_truth), 0x40,
"" }},
{ &hf_sna_rh_dr2,
{ "Definite Response 2 Indicator", "sna.rh.dr2", FT_BOOLEAN, 8, NULL, 0x20,
"" }},
{ &hf_sna_rh_eri,
{ "Exception Response Indicator", "sna.rh.eri", FT_BOOLEAN, 8, NULL, 0x10,
"Used in conjunction with DR1I and DR2I to indicate, in a request, "
"the form of response requested." }},
{ &hf_sna_rh_rti,
{ "Response Type Indicator", "sna.rh.rti", FT_BOOLEAN, 8, TFS(&sna_rh_rti_truth), 0x10,
"" }},
{ &hf_sna_rh_rlwi,
{ "Request Larger Window Indicator", "sna.rh.rlwi", FT_BOOLEAN, 8, NULL, 0x04,
"Indicates whether a larger pacing window was requested." }},
{ &hf_sna_rh_qri,
{ "Queued Response Indicator", "sna.rh.qri", FT_BOOLEAN, 8, TFS(&sna_rh_qri_truth), 0x02,
"" }},
{ &hf_sna_rh_pi,
{ "Pacing Indicator", "sna.rh.pi", FT_BOOLEAN, 8, NULL, 0x01,
"" }},
{ &hf_sna_rh_bbi,
{ "Begin Bracket Indicator", "sna.rh.bbi", FT_BOOLEAN, 8, NULL, 0x80,
"" }},
{ &hf_sna_rh_ebi,
{ "End Bracket Indicator", "sna.rh.ebi", FT_BOOLEAN, 8, NULL, 0x40,
"" }},
{ &hf_sna_rh_cdi,
{ "Change Direction Indicator", "sna.rh.cdi", FT_BOOLEAN, 8, NULL, 0x20,
"" }},
{ &hf_sna_rh_csi,
{ "Code Selection Indicator", "sna.rh.csi", FT_BOOLEAN, 8, VALS(sna_rh_csi_vals), 0x08,
"Specifies the encoding used for the associated FMD RU." }},
{ &hf_sna_rh_edi,
{ "Enciphered Data Indicator", "sna.rh.edi", FT_BOOLEAN, 8, NULL, 0x04,
"Indicates that information in the associated RU is enciphered under "
"session-level cryptography protocols." }},
{ &hf_sna_rh_pdi,
{ "Padded Data Indicator", "sna.rh.pdi", FT_BOOLEAN, 8, NULL, 0x02,
"Indicates that the RU was padded at the end, before encipherment, to the next "
"integral multiple of 8 bytes." }},
{ &hf_sna_rh_cebi,
{ "Conditional End Bracket Indicator", "sna.rh.cebi", FT_BOOLEAN, 8, NULL, 0x01,
"Used to indicate the beginning or end of a group of exchanged "
"requests and responses called a bracket. Only used on LU-LU sessions." }},
{ &hf_sna_ru,
{ "Request/Response Unit", "sna.ru", FT_NONE, BASE_NONE, NULL, 0x0,
""}},
};
proto_sna = proto_register_protocol("Systems Network Architecture", "sna");
proto_register_field_array(proto_sna, hf, array_length(hf));
}
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