240 lines
7.4 KiB
C
240 lines
7.4 KiB
C
/* packet-etag.c
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*
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* 802.1BR E-Tag dissector
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* Inspired by packet-vntag.c
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*
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* Copyright 2016 APCON, Inc.
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* Kim Kempf <kim.kempf@apcon.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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*/
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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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#include <epan/prefs.h>
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void proto_register_etag(void);
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void proto_reg_handoff_etag(void);
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static dissector_handle_t etag_handle;
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static dissector_handle_t ethertype_handle;
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static int proto_etag = -1;
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static gboolean etag_summary_in_tree = TRUE;
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static int hf_etag_etype = -1;
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static int hf_etag_pcp = -1;
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static int hf_etag_dei = -1;
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static int hf_etag_res = -1;
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static int hf_etag_grp = -1;
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static int hf_etag_iecid_base = -1;
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static int hf_etag_iecid_ext = -1;
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static int hf_etag_ecid_base = -1;
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static int hf_etag_ecid_ext = -1;
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static int hf_etag_trailer = -1;
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static gint ett_etag = -1;
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#define IEEE8021BR_LEN 8 /* length including ethertype */
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/* From Table G-2 of IEEE standard 802.1D-2004 */
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static const value_string pri_vals[] = {
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{ 1, "Background" },
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{ 2, "Spare" },
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{ 0, "Best Effort (default)" },
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{ 3, "Excellent Effort" },
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{ 4, "Controlled Load" },
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{ 5, "Video, < 100ms latency and jitter" },
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{ 6, "Voice, < 10ms latency and jitter" },
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{ 7, "Network Control" },
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{ 0, NULL }
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};
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static const value_string grp_vals[] = {
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{ 0, "Point-to-point" },
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{ 1, "Point-to-multipoint" },
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{ 2, "Point-to-multipoint" },
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{ 3, "Point-to-multipoint" },
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{ 0, NULL }
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};
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/*
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From 801.2BR 7.5 E-TAG Control Information
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0 1
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0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| E-Tag EtherType |
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| 0x893F |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| |E| |
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| |-| |
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|E-PCP|D| Ingress_E-CID_base |
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| |E| |
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| |I| |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| | | |
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| R | G | |
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| E | R | E-CID_base |
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| S | P | |
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| V | | |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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|Ingress_E-CID_ | E_CID_ext |
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| ext | |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*/
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static int
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dissect_etag(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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proto_tree *etag_tree = NULL;
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ethertype_data_t ethertype_data;
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guint64 tci;
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/* Decoding per IEEE802.1BR-2012 */
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static int * const fields1[] = {
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&hf_etag_pcp,
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&hf_etag_dei,
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&hf_etag_iecid_base,
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NULL
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};
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static int * const fields2[] = {
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&hf_etag_res,
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&hf_etag_grp,
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&hf_etag_ecid_base,
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NULL
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};
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tci = tvb_get_ntoh48( tvb, 0);
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "ETAG");
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col_clear(pinfo->cinfo, COL_INFO);
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if (tree) {
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guint32 e_cid, ing_e_cid;
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proto_item *ti = proto_tree_add_item(tree, proto_etag, tvb, 0, IEEE8021BR_LEN - 2, ENC_NA);
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e_cid = (guint32)((((tci >> 16) & 0xFFF) | (tci << 12)) & 0xFFFFF); /* E-CID_base | E-CID_ext */
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ing_e_cid = (guint32)((((tci >> 32) & 0xFFF) | ((tci << 4) & 0xFF000)) & 0xFFFFF); /* Ingress_E-CID_base | Ingress_E-CID ext */
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if (etag_summary_in_tree) {
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proto_item_append_text(ti, ", TCI: 0x%" PRIx64 " Ingress_E-CID: %u E-CID: %u", tci, ing_e_cid, e_cid);
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}
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etag_tree = proto_item_add_subtree(ti, ett_etag);
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proto_tree_add_bitmask_list(etag_tree, tvb, 0, 2, fields1, ENC_BIG_ENDIAN);
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proto_tree_add_bitmask_list(etag_tree, tvb, 2, 2, fields2, ENC_BIG_ENDIAN);
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proto_tree_add_item(etag_tree, hf_etag_iecid_ext, tvb, 4, 1, ENC_BIG_ENDIAN);
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proto_tree_add_item(etag_tree, hf_etag_ecid_ext, tvb, 5, 1, ENC_BIG_ENDIAN);
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}
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encap_proto = tvb_get_ntohs(tvb, IEEE8021BR_LEN - 2);
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proto_tree_add_uint(etag_tree, hf_etag_etype, tvb, IEEE8021BR_LEN - 2, 2, encap_proto);
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ethertype_data.etype = encap_proto;
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ethertype_data.payload_offset = IEEE8021BR_LEN;
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ethertype_data.fh_tree = etag_tree;
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ethertype_data.trailer_id = hf_etag_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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void
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proto_register_etag(void)
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{
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static hf_register_info hf[] = {
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{ &hf_etag_pcp,
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{ "E-PCP", "etag.pcp", FT_UINT16, BASE_DEC, VALS(pri_vals), 0xE000,
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"Descriptions are recommendations from IEEE standard 802.1D-2004", HFILL }
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},
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{ &hf_etag_dei,
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{ "E-DEI", "etag.dei", FT_UINT16, BASE_DEC, NULL, 0x1000, NULL, HFILL }
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},
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{ &hf_etag_iecid_base,
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{ "Ingress_E-CID_base", "etag.iecid_base", FT_UINT16, BASE_HEX, NULL, 0x0FFF, NULL, HFILL }
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},
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{ &hf_etag_res,
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{ "Reserved", "etag.resv", FT_UINT16, BASE_DEC, NULL, 0xC000, NULL, HFILL }
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},
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{ &hf_etag_grp,
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{ "GRP", "etag.group", FT_UINT16, BASE_DEC, VALS(grp_vals), 0x3000, NULL, HFILL }
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},
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{ &hf_etag_ecid_base,
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{ "E-CID_base", "etag.ecid_base", FT_UINT16, BASE_HEX, NULL, 0xFFF, NULL, HFILL }
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},
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{ &hf_etag_iecid_ext,
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{ "Ingress_E-CID_ext", "etag.iecid_ext", FT_UINT8, BASE_HEX, NULL, 0, NULL, HFILL }
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},
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{ &hf_etag_ecid_ext,
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{ "E-CID_ext", "etag.ecid_ext", FT_UINT8, BASE_HEX, NULL, 0, NULL, HFILL }
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},
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{ &hf_etag_etype,
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{ "Type", "etag.etype", FT_UINT16, BASE_HEX, VALS(etype_vals), 0x0, NULL, HFILL }
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},
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{ &hf_etag_trailer,
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{ "Trailer", "etag.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_etag
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};
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module_t *etag_module;
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proto_etag = proto_register_protocol("802.1BR E-Tag", "ETAG", "etag");
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etag_handle = register_dissector("etag", dissect_etag, proto_etag);
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proto_register_field_array(proto_etag, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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etag_module = prefs_register_protocol(proto_etag, NULL);
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prefs_register_bool_preference(etag_module, "summary_in_tree",
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"Show E-Tag summary in protocol tree",
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"Whether the E-Tag summary line should be shown in the protocol tree",
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&etag_summary_in_tree);
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}
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void
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proto_reg_handoff_etag(void)
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{
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dissector_add_uint("ethertype", ETHERTYPE_IEEE_802_1BR, etag_handle);
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ethertype_handle = find_dissector_add_dependency("ethertype", proto_etag);
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}
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/*
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* Editor modelines - https://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: t
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* End:
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*
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* vi: set shiftwidth=8 tabstop=8 noexpandtab:
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* :indentSize=8:tabSize=8:noTabs=false:
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*/
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