forked from osmocom/wireshark
125 lines
3.6 KiB
C
125 lines
3.6 KiB
C
/* packet-xns-llc.c
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* Routines for 3Com's encapsulation of XNS over 802.2 LLC
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* (and other protocols using DSAP 80)
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*
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* $Id$
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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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 <glib.h>
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#include <epan/packet.h>
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#include <epan/etypes.h>
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static int proto_3com_xns = -1;
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static int hf_3com_xns_type_ethertype = -1;
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static int hf_3com_xns_type_retix_bpdu = -1;
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static gint ett_3com_xns = -1;
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static const value_string retix_bpdu_type_vals[] = {
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{ 0x0004, "Retix Spanning Tree" },
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{ 0, NULL }
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};
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static dissector_handle_t retix_bpdu_handle;
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/*
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* Apparently 3Com had some scheme for encapsulating XNS in 802.2 LLC,
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* using a DSAP and SSAP of 0x80, and putting a 2-byte field that appeared
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* to contain, at least for IPP, the Ethertype value for IPP.
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*
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* We assume that the value there is an Ethertype value, except for
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* the Retix spanning tree protocol, which also uses a DSAP and SSAP
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* of 0x80 but has, at least in one capture, 0x0004 as the type
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* field. We handle that specially.
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*
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* XXX - I've also seen packets on 802.11 with a DSAP and SSAP of 0x80,
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* but with random stuff that appears neither to be XNS nor Retix
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* spanning tree.
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*/
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static void
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dissect_3com_xns(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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proto_tree *subtree = NULL;
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proto_tree *ti;
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guint16 type;
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if (check_col(pinfo->cinfo, COL_PROTOCOL))
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "3Com XNS");
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if (check_col(pinfo->cinfo, COL_INFO))
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col_clear(pinfo->cinfo, COL_INFO);
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if (tree) {
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ti = proto_tree_add_item(tree, proto_3com_xns, tvb, 0, 4, FALSE);
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subtree = proto_item_add_subtree(ti, ett_3com_xns);
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}
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type = tvb_get_ntohs(tvb, 0);
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if (type == 0x0004) {
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proto_tree_add_uint(subtree, hf_3com_xns_type_retix_bpdu,
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tvb, 0, 2, type);
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call_dissector(retix_bpdu_handle,
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tvb_new_subset(tvb, 2, -1, -1), pinfo, tree);
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} else {
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ethertype(type, tvb, 2, pinfo, tree, subtree,
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hf_3com_xns_type_ethertype, -1, 0);
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}
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}
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void
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proto_register_3com_xns(void)
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{
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static hf_register_info hf[] = {
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/* registered here but handled in ethertype.c */
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{ &hf_3com_xns_type_ethertype,
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{ "Type", "xnsllc.type", FT_UINT16, BASE_HEX,
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VALS(etype_vals), 0x0, "", HFILL }},
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{ &hf_3com_xns_type_retix_bpdu,
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{ "Type", "xnsllc.type", FT_UINT16, BASE_HEX,
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VALS(retix_bpdu_type_vals), 0x0, "", HFILL }},
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};
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static gint *ett[] ={
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&ett_3com_xns,
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};
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proto_3com_xns = proto_register_protocol("3Com XNS Encapsulation", "3COMXNS", "3comxns");
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proto_register_field_array(proto_3com_xns, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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}
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void
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proto_reg_handoff_3com_xns(void)
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{
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dissector_handle_t our_xns_handle;
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retix_bpdu_handle = find_dissector("rbpdu");
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our_xns_handle = create_dissector_handle(dissect_3com_xns,
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proto_3com_xns);
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dissector_add("llc.dsap", 0x80, our_xns_handle);
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}
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