forked from osmocom/wireshark
297 lines
8.4 KiB
C
297 lines
8.4 KiB
C
/* packet-isl.c
|
|
* Routines for Cisco ISL Ethernet header disassembly
|
|
*
|
|
* $Id: packet-isl.c,v 1.4 2000/01/24 21:56:24 guy Exp $
|
|
*
|
|
* Ethereal - Network traffic analyzer
|
|
* By Gerald Combs <gerald@zing.org>
|
|
* 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
|
|
|
|
#ifdef HAVE_NETINET_IN_H
|
|
# include <netinet/in.h>
|
|
#endif
|
|
|
|
#include <glib.h>
|
|
#include "packet.h"
|
|
#include "etypes.h"
|
|
|
|
/*
|
|
* See
|
|
*
|
|
* http://www.cisco.com/warp/public/741/4.html
|
|
*
|
|
* and
|
|
*
|
|
* http://www.cisco.com/univercd/cc/td/doc/product/lan/trsrb/frames.htm
|
|
*
|
|
* for information on ISL.
|
|
*/
|
|
static int proto_isl = -1;
|
|
static int hf_isl_dst = -1;
|
|
static int hf_isl_type = -1;
|
|
static int hf_isl_user_eth = -1;
|
|
static int hf_isl_user = -1;
|
|
static int hf_isl_src = -1;
|
|
static int hf_isl_len = -1;
|
|
static int hf_isl_hsa = -1;
|
|
static int hf_isl_vlan_id = -1;
|
|
static int hf_isl_bpdu = -1;
|
|
static int hf_isl_index = -1;
|
|
static int hf_isl_crc = -1;
|
|
static int hf_isl_src_vlan_id = -1;
|
|
static int hf_isl_explorer = -1;
|
|
static int hf_isl_dst_route_descriptor = -1;
|
|
static int hf_isl_src_route_descriptor = -1;
|
|
static int hf_isl_fcs_not_incl = -1;
|
|
static int hf_isl_esize = -1;
|
|
|
|
static gint ett_isl = -1;
|
|
|
|
#define ISL_HEADER_SIZE 26
|
|
|
|
#define TYPE_ETHER 0x0
|
|
#define TYPE_TR 0x1
|
|
#define TYPE_FDDI 0x2
|
|
#define TYPE_ATM 0x3
|
|
|
|
void
|
|
capture_isl(const u_char *pd, int offset, packet_counts *ld)
|
|
{
|
|
guint8 type;
|
|
|
|
if (!BYTES_ARE_IN_FRAME(offset, ISL_HEADER_SIZE)) {
|
|
ld->other++;
|
|
return;
|
|
}
|
|
|
|
type = (pd[offset+5] >> 4)&0x0F;
|
|
|
|
switch (type) {
|
|
|
|
case TYPE_ETHER:
|
|
offset += 14+12; /* skip the header */
|
|
capture_eth(pd, offset, ld);
|
|
break;
|
|
|
|
case TYPE_TR:
|
|
offset += 14+17; /* skip the header */
|
|
capture_tr(pd, offset, ld);
|
|
break;
|
|
|
|
default:
|
|
ld->other++;
|
|
break;
|
|
}
|
|
}
|
|
|
|
static const value_string type_vals[] = {
|
|
{TYPE_ETHER, "Ethernet"},
|
|
{TYPE_TR, "Token-Ring"},
|
|
{TYPE_FDDI, "FDDI"},
|
|
{TYPE_ATM, "ATM"},
|
|
{0, NULL}
|
|
};
|
|
|
|
static const value_string ether_user_vals[] = {
|
|
{0x0, "Normal priority"},
|
|
{0x1, "Priority 1"},
|
|
{0x2, "Priority 2"},
|
|
{0x3, "Highest priority"},
|
|
{0, NULL}
|
|
};
|
|
|
|
static const true_false_string bpdu_tfs = {
|
|
"Yes",
|
|
"No"
|
|
};
|
|
|
|
static const true_false_string explorer_tfs = {
|
|
"Explorer frame",
|
|
"Data frame"
|
|
};
|
|
|
|
void
|
|
dissect_isl(const u_char *pd, int offset, frame_data *fd, proto_tree *tree)
|
|
{
|
|
proto_tree *fh_tree = NULL;
|
|
proto_item *ti;
|
|
guint8 type;
|
|
guint16 length;
|
|
|
|
if (!BYTES_ARE_IN_FRAME(offset, ISL_HEADER_SIZE)) {
|
|
dissect_data(pd, offset, fd, tree);
|
|
return;
|
|
}
|
|
|
|
if (check_col(fd, COL_PROTOCOL))
|
|
col_add_str(fd, COL_PROTOCOL, "ISL");
|
|
if (check_col(fd, COL_INFO))
|
|
col_add_fstr(fd, COL_INFO, "VLAN ID: 0x%04X", pntohs(&pd[offset+20]) >> 1);
|
|
|
|
type = (pd[offset+5] >> 4)&0x0F;
|
|
|
|
if (tree) {
|
|
ti = proto_tree_add_item_format(tree, proto_isl, offset, ISL_HEADER_SIZE,
|
|
NULL, "ISL");
|
|
fh_tree = proto_item_add_subtree(ti, ett_isl);
|
|
proto_tree_add_item(fh_tree, hf_isl_dst, offset+0, 6, &pd[offset+0]);
|
|
proto_tree_add_item(fh_tree, hf_isl_type, offset+5, 1, pd[offset+5]);
|
|
switch (type) {
|
|
|
|
case TYPE_ETHER:
|
|
proto_tree_add_item(fh_tree, hf_isl_user_eth, offset+5, 1,
|
|
pd[offset+5]&0x03);
|
|
break;
|
|
|
|
default:
|
|
/* XXX - the spec appears to indicate that the "User" field is
|
|
used for TYPE_TR to distinguish between types of packets. */
|
|
proto_tree_add_item(fh_tree, hf_isl_user, offset+5, 1, pd[offset+5]);
|
|
break;
|
|
}
|
|
proto_tree_add_item(fh_tree, hf_isl_src, offset+6, 6, &pd[offset+6]);
|
|
length = pntohs(&pd[offset+12]);
|
|
proto_tree_add_item(fh_tree, hf_isl_len, offset+12, 2, length);
|
|
|
|
/* This part looks sort of like a SNAP-encapsulated LLC header... */
|
|
proto_tree_add_text(fh_tree, offset+14, 1, "DSAP: 0x%X", pd[offset+14]);
|
|
proto_tree_add_text(fh_tree, offset+15, 1, "SSAP: 0x%X", pd[offset+15]);
|
|
proto_tree_add_text(fh_tree, offset+16, 1, "Control: 0x%X", pd[offset+16]);
|
|
|
|
/* ...but this is the manufacturer's ID portion of the source address
|
|
field (which is, admittedly, an OUI). */
|
|
proto_tree_add_item(fh_tree, hf_isl_hsa, offset+17, 3,
|
|
pd[offset+17] << 16 | pd[offset+18] << 8 | pd[offset+19]);
|
|
proto_tree_add_item(fh_tree, hf_isl_vlan_id, offset+20, 2,
|
|
pntohs(&pd[offset+20]));
|
|
proto_tree_add_item(fh_tree, hf_isl_bpdu, offset+20, 2,
|
|
pntohs(&pd[offset+20]));
|
|
proto_tree_add_item(fh_tree, hf_isl_index, offset+22, 2,
|
|
pntohs(&pd[offset+22]));
|
|
|
|
/* Now for the CRC, which is at the *end* of the packet. */
|
|
if (BYTES_ARE_IN_FRAME(pi.len - 4, 4)) {
|
|
proto_tree_add_item(fh_tree, hf_isl_crc, pi.len - 4, 4,
|
|
pntohl(&pd[END_OF_FRAME - 4]));
|
|
}
|
|
}
|
|
|
|
switch (type) {
|
|
|
|
case TYPE_ETHER:
|
|
dissect_eth(pd, offset+26, fd, tree);
|
|
break;
|
|
|
|
case TYPE_TR:
|
|
proto_tree_add_item(fh_tree, hf_isl_src_vlan_id, offset+24, 2,
|
|
pntohs(&pd[offset+24]));
|
|
proto_tree_add_item(fh_tree, hf_isl_explorer, offset+24, 2,
|
|
pntohs(&pd[offset+24]));
|
|
proto_tree_add_item(fh_tree, hf_isl_dst_route_descriptor, offset+26, 2,
|
|
pntohs(&pd[offset+26]));
|
|
proto_tree_add_item(fh_tree, hf_isl_src_route_descriptor, offset+28, 2,
|
|
pntohs(&pd[offset+28]));
|
|
proto_tree_add_item(fh_tree, hf_isl_fcs_not_incl, offset+30, 1,
|
|
pd[offset+30]);
|
|
proto_tree_add_item(fh_tree, hf_isl_esize, offset+16, 1,
|
|
pd[offset+30]);
|
|
dissect_tr(pd, offset+31, fd, tree);
|
|
break;
|
|
|
|
default:
|
|
dissect_data(pd, offset+26, fd, tree);
|
|
break;
|
|
}
|
|
}
|
|
|
|
void
|
|
proto_register_isl(void)
|
|
{
|
|
static hf_register_info hf[] = {
|
|
{ &hf_isl_dst,
|
|
{ "Destination", "isl.dst", FT_ETHER, BASE_NONE, NULL, 0x0,
|
|
"Destination Address" }},
|
|
{ &hf_isl_type,
|
|
{ "Type", "isl.type", FT_UINT8, BASE_NONE,
|
|
VALS(type_vals), 0xF0, "Type" }},
|
|
{ &hf_isl_user_eth,
|
|
{ "User", "isl.user_eth", FT_UINT8, BASE_NONE,
|
|
VALS(ether_user_vals), 0x0F, "Priority (for Ethernet)" }},
|
|
{ &hf_isl_user,
|
|
{ "User", "isl.user", FT_UINT8, BASE_HEX, NULL, 0x0F,
|
|
"User-defined bits" }},
|
|
{ &hf_isl_src,
|
|
{ "Source", "isl.src", FT_ETHER, BASE_NONE, NULL, 0x0,
|
|
"Source Hardware Address" }},
|
|
{ &hf_isl_len,
|
|
{ "Length", "isl.len", FT_UINT16, BASE_DEC, NULL, 0x0,
|
|
"" }},
|
|
{ &hf_isl_hsa,
|
|
{ "HSA", "isl.hsa", FT_UINT24, BASE_HEX, NULL, 0x0,
|
|
"High bits of source address" }},
|
|
{ &hf_isl_vlan_id,
|
|
{ "VLAN ID", "isl.vlan_id", FT_UINT16, BASE_HEX, NULL,
|
|
0xFFFE, "Virtual LAN ID" }},
|
|
{ &hf_isl_bpdu,
|
|
{ "BPDU", "isl.bpdu", FT_BOOLEAN, 16,
|
|
TFS(&bpdu_tfs), 0x0001, "BPDU indicator" }},
|
|
{ &hf_isl_index,
|
|
{ "Index", "isl.index", FT_UINT16, BASE_DEC, NULL, 0x0,
|
|
"Port index of packet source" }},
|
|
{ &hf_isl_crc,
|
|
{ "CRC", "isl.crc", FT_UINT32, BASE_HEX, NULL, 0x0,
|
|
"CRC field of encapsulated frame" }},
|
|
{ &hf_isl_src_vlan_id,
|
|
{ "Source VLAN ID", "isl.src_vlan_id", FT_UINT16, BASE_HEX, NULL,
|
|
0xFFFE, "Source Virtual LAN ID" }},
|
|
{ &hf_isl_explorer,
|
|
{ "Explorer", "isl.explorer", FT_BOOLEAN, 16,
|
|
TFS(&explorer_tfs), 0x0001, "Explorer" }},
|
|
{ &hf_isl_dst_route_descriptor,
|
|
{ "Destination route descriptor", "isl.dst_route_desc",
|
|
FT_UINT16, BASE_HEX, NULL, 0x0,
|
|
"Route descriptor to be used for forwarding" }},
|
|
{ &hf_isl_src_route_descriptor,
|
|
{ "Source-route descriptor", "isl.src_route_desc",
|
|
FT_UINT16, BASE_HEX, NULL, 0x0,
|
|
"Route descriptor to be used for source learning" }},
|
|
{ &hf_isl_fcs_not_incl,
|
|
{ "FCS Not Included", "isl.fcs_not_incl", FT_BOOLEAN, 9,
|
|
NULL, 0x40, "FCS not included" }},
|
|
{ &hf_isl_esize,
|
|
{ "Esize", "isl.esize", FT_UINT8, BASE_DEC, NULL,
|
|
0x3F, "Frame size for frames less than 64 bytes" }},
|
|
};
|
|
static gint *ett[] = {
|
|
&ett_isl,
|
|
};
|
|
|
|
proto_isl = proto_register_protocol("Cisco ISL", "isl");
|
|
proto_register_field_array(proto_isl, hf, array_length(hf));
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
}
|