2013-09-03 17:35:00 +00:00
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/* packet-macsec.c
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* Routines for MACSEC dissection
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* Copyright 2013, Allan W. Nielsen <anielsen@vitesse.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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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (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 along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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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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2013-12-14 16:09:57 +00:00
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void proto_register_macsec(void);
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void proto_reg_handoff_macsec(void);
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2013-09-03 17:35:00 +00:00
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#define TCI_V_MASK 0x80
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#define TCI_ES_MASK 0x40
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#define TCI_SC_MASK 0x20
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#define TCI_SCB_MASK 0x10
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#define TCI_E_MASK 0x08
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#define TCI_C_MASK 0x04
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#define TCI_AN_MASK 0x03
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static dissector_handle_t data_handle;
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static int proto_macsec = -1;
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static int hf_macsec_TCI = -1;
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static int hf_macsec_TCI_V = -1;
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static int hf_macsec_TCI_ES = -1;
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static int hf_macsec_TCI_SC = -1;
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static int hf_macsec_TCI_SCB = -1;
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static int hf_macsec_TCI_E = -1;
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static int hf_macsec_TCI_C = -1;
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static int hf_macsec_AN = -1;
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static int hf_macsec_SL = -1;
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static int hf_macsec_PN = -1;
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static int hf_macsec_SCI_System_identifier = -1;
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static int hf_macsec_SCI_port_number = -1;
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static int hf_macsec_ICV = -1;
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/* Initialize the subtree pointers */
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static gint ett_macsec = -1;
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static gint ett_macsec_tci = -1;
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/* Code to actually dissect the packets */
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static int dissect_macsec(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_) {
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unsigned sectag_length, data_length, icv_length = 16;
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unsigned sectag_offset = 0, data_offset, icv_offset;
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guint8 tci_an_field;
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proto_item *macsec_item, *tci_item;
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proto_tree *macsec_tree, *tci_tree;
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tvbuff_t *next_tvb;
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tci_an_field = tvb_get_guint8(tvb, 0);
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if ((tci_an_field & TCI_V_MASK) != 0) { /* version must be zero */
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return 0;
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}
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if (tci_an_field & TCI_SC_MASK) {
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sectag_length = 14;
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} else {
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sectag_length = 6;
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}
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/* Check for short length */
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2014-06-19 17:18:16 +00:00
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if (tvb_length(tvb) <= (sectag_length + icv_length)) {
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2013-09-03 17:35:00 +00:00
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return 0;
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}
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data_offset = sectag_length;
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2014-06-19 17:18:16 +00:00
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data_length = tvb_length(tvb) - sectag_length - icv_length;
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2013-09-03 17:35:00 +00:00
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icv_offset = data_length + data_offset;
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2014-06-06 14:35:50 +00:00
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next_tvb = tvb_new_subset_length(tvb, data_offset, data_length);
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2013-09-03 17:35:00 +00:00
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "MACSEC");
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col_set_str(pinfo->cinfo, COL_INFO, "MACsec frame");
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if (tree) {
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macsec_item = proto_tree_add_item(tree,
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proto_macsec, tvb, 0, sectag_length, ENC_NA);
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macsec_tree = proto_item_add_subtree(macsec_item, ett_macsec);
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tci_item = proto_tree_add_uint_format(macsec_tree, hf_macsec_TCI, tvb,
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sectag_offset, 1, tci_an_field,
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"TCI=0x%02x: V=%d, ES=%d, SC=%d, SCB=%d, E=%d, C=%d, AN=%d",
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tci_an_field,
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((TCI_V_MASK & tci_an_field) ? 1:0),
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((TCI_ES_MASK & tci_an_field) ? 1:0),
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((TCI_SC_MASK & tci_an_field) ? 1:0),
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((TCI_SCB_MASK & tci_an_field) ? 1:0),
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((TCI_E_MASK & tci_an_field) ? 1:0),
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((TCI_C_MASK & tci_an_field) ? 1:0),
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(TCI_AN_MASK & tci_an_field));
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tci_tree = proto_item_add_subtree(tci_item, ett_macsec_tci);
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2014-12-13 17:52:20 +00:00
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proto_tree_add_item(tci_tree, hf_macsec_TCI_V, tvb, sectag_offset, 1, ENC_BIG_ENDIAN);
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proto_tree_add_item(tci_tree, hf_macsec_TCI_ES, tvb, sectag_offset, 1, ENC_BIG_ENDIAN);
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proto_tree_add_item(tci_tree, hf_macsec_TCI_SC, tvb, sectag_offset, 1, ENC_BIG_ENDIAN);
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proto_tree_add_item(tci_tree, hf_macsec_TCI_SCB, tvb, sectag_offset, 1, ENC_BIG_ENDIAN);
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proto_tree_add_item(tci_tree, hf_macsec_TCI_E, tvb, sectag_offset, 1, ENC_BIG_ENDIAN);
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proto_tree_add_item(tci_tree, hf_macsec_TCI_C, tvb, sectag_offset, 1, ENC_BIG_ENDIAN);
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proto_tree_add_item(tci_tree, hf_macsec_AN, tvb, sectag_offset, 1, ENC_BIG_ENDIAN);
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proto_tree_add_item(macsec_tree, hf_macsec_SL, tvb, sectag_offset + 1, 1, ENC_BIG_ENDIAN);
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2014-09-19 01:18:34 +00:00
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proto_tree_add_item(macsec_tree, hf_macsec_PN, tvb, sectag_offset + 2, 4, ENC_BIG_ENDIAN);
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2013-09-03 17:35:00 +00:00
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if (sectag_length == 14) {
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proto_tree_add_item(macsec_tree, hf_macsec_SCI_System_identifier,
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tvb, sectag_offset + 6, 6, ENC_NA);
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proto_tree_add_item(macsec_tree, hf_macsec_SCI_port_number, tvb,
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2014-09-19 01:18:34 +00:00
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sectag_offset + 12, 2, ENC_BIG_ENDIAN);
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2013-09-03 17:35:00 +00:00
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}
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call_dissector(data_handle, next_tvb, pinfo, tree);
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proto_tree_add_item(macsec_tree, hf_macsec_ICV, tvb, icv_offset,
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icv_length, ENC_NA);
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}
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2014-06-19 17:18:16 +00:00
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return tvb_length(tvb);
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2013-09-03 17:35:00 +00:00
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}
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void
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proto_register_macsec(void)
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{
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static hf_register_info hf[] = {
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{ &hf_macsec_TCI, { "TAG Control Information", "macsec.TCI",FT_UINT8,
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BASE_HEX, NULL, 0xfc, NULL, HFILL} },
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{ &hf_macsec_TCI_V, { "VER", "macsec.TCI.V", FT_UINT8, BASE_HEX,
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NULL, 0x80, NULL, HFILL} },
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{ &hf_macsec_TCI_ES, { "ES", "macsec.TCI.ES", FT_UINT8, BASE_HEX, NULL,
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0x40, NULL, HFILL} },
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{ &hf_macsec_TCI_SC, { "SC", "macsec.TCI.SC", FT_UINT8, BASE_HEX, NULL,
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0x20, NULL, HFILL} },
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{ &hf_macsec_TCI_SCB, { "SCB", "macsec.TCI.SCB", FT_UINT8, BASE_HEX,
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NULL, 0x10, NULL, HFILL} },
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{ &hf_macsec_TCI_E, { "E", "macsec.TCI.E", FT_UINT8, BASE_HEX, NULL,
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0x08, NULL, HFILL} },
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{ &hf_macsec_TCI_C, { "C", "macsec.TCI.C", FT_UINT8, BASE_HEX, NULL,
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0x04, NULL, HFILL} },
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{ &hf_macsec_AN, { "AN", "macsec.AN", FT_UINT8,
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BASE_HEX, NULL, 0x03, NULL, HFILL} },
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{ &hf_macsec_SL, { "Short length", "macsec.SL", FT_UINT8, BASE_DEC,
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NULL, 0xFF, NULL, HFILL} },
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{ &hf_macsec_PN, { "Packet number", "macsec.PN", FT_UINT32, BASE_DEC,
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NULL, 0xFFFFFFFF, NULL, HFILL} },
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{ &hf_macsec_SCI_System_identifier,
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{ "System Identifier", "macsec.SCI.SytemIdentifier",
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FT_ETHER, BASE_NONE, NULL, 0x00, NULL, HFILL} },
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{ &hf_macsec_SCI_port_number,
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{ "Port number", "macsec.SCI.port_number",
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FT_UINT16, BASE_DEC, NULL, 0xFFFF, NULL, HFILL} },
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{ &hf_macsec_ICV, { "ICV", "macsec.ICV",
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FT_BYTES, BASE_NONE, NULL, 0x00, NULL, HFILL} }
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};
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/* Setup protocol subtree array */
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static gint *ett[] = {
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&ett_macsec,
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&ett_macsec_tci
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};
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/* Register the protocol name and description */
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proto_macsec = proto_register_protocol("802.1AE Secure tag", "macsec", "macsec");
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/* Required function calls to register the header fields and subtrees used */
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proto_register_field_array(proto_macsec, 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_macsec(void)
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{
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dissector_handle_t macsec_handle;
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data_handle = find_dissector("data");
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macsec_handle = new_create_dissector_handle(dissect_macsec, proto_macsec);
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dissector_add_uint("ethertype", ETHERTYPE_MACSEC, macsec_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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