forked from osmocom/wireshark
![Dario Lombardo](/assets/img/avatar_default.png)
Change-Id: I92c94448e6641716d03158a5f332c8b53709423a Reviewed-on: https://code.wireshark.org/review/25756 Petri-Dish: Dario Lombardo <lomato@gmail.com> Reviewed-by: Anders Broman <a.broman58@gmail.com>
192 lines
5.8 KiB
C
192 lines
5.8 KiB
C
/* packet-cisco-metadata.c
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* Routines for dissection of Cisco's MetaData protocol.
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* draft-smith-kandula-sxp
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* Copyright 2013 by Vaibhav Katkade (vkatkade[AT]cisco.com)
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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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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#include "config.h"
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#include <epan/packet.h>
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#include <epan/etypes.h>
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#if 0
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#include "packet-ieee8023.h"
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#endif
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void proto_register_cmd(void);
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void proto_reg_handoff_cmd(void);
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static dissector_handle_t ethertype_handle;
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static dissector_table_t gre_dissector_table;
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static int proto_cmd = -1;
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static int hf_cmd_version = -1;
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static int hf_cmd_length = -1;
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static int hf_cmd_options = -1;
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static int hf_cmd_sgt = -1;
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static int hf_eth_type = -1;
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static int hf_cmd_trailer = -1;
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static gint ett_cmd = -1;
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static int
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dissect_cmd_eth(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
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{
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guint16 encap_proto;
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ethertype_data_t ethertype_data;
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proto_tree *cmd_tree = NULL;
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gint offset = 0;
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "CMD");
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col_clear(pinfo->cinfo, COL_INFO);
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if (tree) {
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proto_item *ti = proto_tree_add_item(tree, proto_cmd, tvb, 0, 6, ENC_NA);
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cmd_tree = proto_item_add_subtree(ti, ett_cmd);
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proto_tree_add_item(cmd_tree, hf_cmd_version, tvb, offset, 1, ENC_BIG_ENDIAN);
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offset += 1;
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proto_tree_add_item(cmd_tree, hf_cmd_length, tvb, offset, 1, ENC_BIG_ENDIAN);
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offset += 1;
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proto_tree_add_item(cmd_tree, hf_cmd_options, tvb, offset, 2, ENC_BIG_ENDIAN);
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offset += 2;
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proto_tree_add_item(cmd_tree, hf_cmd_sgt, tvb, offset, 2, ENC_BIG_ENDIAN);
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/*offset += 2;*/
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}
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encap_proto = tvb_get_ntohs(tvb, 6);
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/* This Logic to identify and decode IEEE 802.3 frames is not working correctly. Carry over code from packet-vlan.c
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* Commenting it out for now will display as Unknown for L2 control frames instead of showing a wrong decode.
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*/
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#if 0
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if (encap_proto <= IEEE_802_3_MAX_LEN) {
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gboolean is_802_2 = TRUE;
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/* Don't throw an exception for this check (even a BoundsError) */
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if (tvb_captured_length_remaining(tvb, 4) >= 2) {
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if (tvb_get_ntohs(tvb, 4) == 0xffff)
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is_802_2 = FALSE;
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}
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dissect_802_3(encap_proto, is_802_2, tvb, 4, pinfo, tree, cmd_tree, hf_eth_type, hf_cmd_trailer, 0);
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} else {
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#endif
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ethertype_data.etype = encap_proto;
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ethertype_data.offset_after_ethertype = 8;
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ethertype_data.fh_tree = cmd_tree;
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ethertype_data.etype_id = hf_eth_type;
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ethertype_data.trailer_id = hf_cmd_trailer;
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ethertype_data.fcs_len = 0;
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call_dissector_with_data(ethertype_handle, tvb, pinfo, tree, ðertype_data);
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return tvb_captured_length(tvb);
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}
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static int
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dissect_cmd_gre(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
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{
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proto_item *ti = NULL;
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proto_tree *cmd_tree = NULL;
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guint16 encap_proto;
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tvbuff_t *next_tvb;
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gint offset = 0;
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "CMD");
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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_cmd, tvb, 0, 6, ENC_NA);
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cmd_tree = proto_item_add_subtree(ti, ett_cmd);
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}
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encap_proto = tvb_get_ntohs(tvb, 0);
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proto_tree_add_item(cmd_tree, hf_eth_type, tvb, offset, 2, ENC_BIG_ENDIAN);
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offset += 2;
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proto_tree_add_item(cmd_tree, hf_cmd_version, tvb, offset, 1, ENC_BIG_ENDIAN);
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offset += 1;
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proto_tree_add_item(cmd_tree, hf_cmd_length, tvb, offset, 1, ENC_BIG_ENDIAN);
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offset += 1;
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proto_tree_add_item(cmd_tree, hf_cmd_options, tvb, offset, 2, ENC_BIG_ENDIAN);
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offset += 2;
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proto_tree_add_item(cmd_tree, hf_cmd_sgt, tvb, offset, 2, ENC_BIG_ENDIAN);
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offset += 2;
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next_tvb = tvb_new_subset_remaining(tvb, offset);
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if (!dissector_try_uint(gre_dissector_table, encap_proto, next_tvb, pinfo, tree))
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call_data_dissector(next_tvb, pinfo, tree);
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return tvb_captured_length(tvb);
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}
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void
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proto_register_cmd(void)
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{
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static hf_register_info hf[] = {
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{ &hf_cmd_version,
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{ "Version", "cmd.version", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL }
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},
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{ &hf_cmd_length,
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{ "Length", "cmd.length", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL }
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},
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{ &hf_cmd_options,
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{ "Options", "cmd.options", FT_UINT16, BASE_HEX, NULL, 0x0, NULL, HFILL }
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},
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{ &hf_cmd_sgt,
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{ "SGT", "cmd.sgt", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL }
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},
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{ &hf_eth_type,
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{ "Type", "cmd.type", FT_UINT16, BASE_HEX, VALS(etype_vals), 0x0, NULL, HFILL }
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},
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{ &hf_cmd_trailer,
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{ "Trailer", "cmd.trailer", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }
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},
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};
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static gint *ett[] = {
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&ett_cmd
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};
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proto_cmd = proto_register_protocol("Cisco MetaData", "Cisco MetaData", "cmd");
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proto_register_field_array(proto_cmd, 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_cmd(void)
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{
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dissector_handle_t cmd_eth_handle;
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dissector_handle_t cmd_gre_handle;
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ethertype_handle = find_dissector_add_dependency("ethertype", proto_cmd);
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gre_dissector_table = find_dissector_table("gre.proto");
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cmd_eth_handle = create_dissector_handle(dissect_cmd_eth, proto_cmd);
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cmd_gre_handle = create_dissector_handle(dissect_cmd_gre, proto_cmd);
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dissector_add_uint("ethertype", ETHERTYPE_CMD, cmd_eth_handle);
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dissector_add_uint("gre.proto", ETHERTYPE_CMD, cmd_gre_handle);
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}
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/*
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* Editor modelines - http://www.wireshark.org/tools/modelines.html
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*
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* Local variables:
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* c-basic-offset: 4
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* tab-width: 8
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* indent-tabs-mode: nil
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* End:
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*
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* vi: set shiftwidth=4 tabstop=8 expandtab:
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* :indentSize=4:tabSize=8:noTabs=true:
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*/
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