/* packet-etag.c * * 802.1BR E-Tag dissector * Inspired by packet-vntag.c * * Copyright 2016 APCON, Inc. * Kim Kempf * * Wireshark - Network traffic analyzer * By Gerald Combs * 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. * */ #include "config.h" #include #include #include void proto_register_etag(void); void proto_reg_handoff_etag(void); static dissector_handle_t ethertype_handle; static int proto_etag = -1; static gboolean etag_summary_in_tree = TRUE; static int hf_etag_etype = -1; static int hf_etag_pcp = -1; static int hf_etag_dei = -1; static int hf_etag_res = -1; static int hf_etag_grp = -1; static int hf_etag_iecid_base = -1; static int hf_etag_iecid_ext = -1; static int hf_etag_ecid_base = -1; static int hf_etag_ecid_ext = -1; static int hf_etag_trailer = -1; static gint ett_etag = -1; #define IEEE8021BR_LEN 8 /* length including ethertype */ /* From Table G-2 of IEEE standard 802.1D-2004 */ static const value_string pri_vals[] = { { 1, "Background" }, { 2, "Spare" }, { 0, "Best Effort (default)" }, { 3, "Excellent Effort" }, { 4, "Controlled Load" }, { 5, "Video, < 100ms latency and jitter" }, { 6, "Voice, < 10ms latency and jitter" }, { 7, "Network Control" }, { 0, NULL } }; static const value_string grp_vals[] = { { 0, "Point-to-point" }, { 1, "Point-to-multipoint" }, { 2, "Point-to-multipoint" }, { 3, "Point-to-multipoint" }, { 0, NULL } }; /* From 801.2BR 7.5 E-TAG Control Information 0 1 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | | | | | E-Tag EtherType | | 0x893F | | | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |E| | | |-| | |E-PCP|D| Ingress_E-CID_base | | |E| | | |I| | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | | | | | R | G | | | E | R | E-CID_base | | S | P | | | V | | | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | | | | | | |Ingress_E-CID_ | E_CID_ext | | ext | | | | | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ */ static int dissect_etag(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_) { guint16 encap_proto; proto_tree *etag_tree = NULL; ethertype_data_t ethertype_data; guint64 tci; /* Decoding per IEEE802.1BR-2012 */ static const int * fields1[] = { &hf_etag_pcp, &hf_etag_dei, &hf_etag_iecid_base, NULL }; static const int * fields2[] = { &hf_etag_res, &hf_etag_grp, &hf_etag_ecid_base, NULL }; tci = tvb_get_ntoh48( tvb, 0); col_set_str(pinfo->cinfo, COL_PROTOCOL, "ETAG"); col_clear(pinfo->cinfo, COL_INFO); if (tree) { guint32 e_cid, ing_e_cid; proto_item *ti = proto_tree_add_item(tree, proto_etag, tvb, 0, IEEE8021BR_LEN - 2, ENC_NA); e_cid = (guint32)((((tci >> 16) & 0xFFF) | (tci << 12)) & 0xFFFFF); /* E-CID_base | E-CID_ext */ ing_e_cid = (guint32)((((tci >> 32) & 0xFFF) | ((tci << 4) & 0xFF000)) & 0xFFFFF); /* Ingress_E-CID_base | Ingress_E-CID ext */ if (etag_summary_in_tree) { proto_item_append_text(ti, ", TCI: 0x%" G_GINT64_MODIFIER "x Ingress_E-CID: %u E-CID: %u", tci, ing_e_cid, e_cid); } etag_tree = proto_item_add_subtree(ti, ett_etag); proto_tree_add_bitmask_list(etag_tree, tvb, 0, 2, fields1, ENC_BIG_ENDIAN); proto_tree_add_bitmask_list(etag_tree, tvb, 2, 2, fields2, ENC_BIG_ENDIAN); proto_tree_add_item(etag_tree, hf_etag_iecid_ext, tvb, 4, 1, ENC_BIG_ENDIAN); proto_tree_add_item(etag_tree, hf_etag_ecid_ext, tvb, 5, 1, ENC_BIG_ENDIAN); } encap_proto = tvb_get_ntohs(tvb, IEEE8021BR_LEN - 2); ethertype_data.etype = encap_proto; ethertype_data.offset_after_ethertype = IEEE8021BR_LEN; ethertype_data.fh_tree = etag_tree; ethertype_data.etype_id = hf_etag_etype; ethertype_data.trailer_id = hf_etag_trailer; ethertype_data.fcs_len = 0; call_dissector_with_data(ethertype_handle, tvb, pinfo, tree, ðertype_data); return tvb_captured_length(tvb); } void proto_register_etag(void) { static hf_register_info hf[] = { { &hf_etag_pcp, { "E-PCP", "etag.pcp", FT_UINT16, BASE_DEC, VALS(pri_vals), 0xE000, "Descriptions are recommendations from IEEE standard 802.1D-2004", HFILL } }, { &hf_etag_dei, { "E-DEI", "etag.dei", FT_UINT16, BASE_DEC, NULL, 0x1000, NULL, HFILL } }, { &hf_etag_iecid_base, { "Ingress_E-CID_base", "etag.iecid_base", FT_UINT16, BASE_HEX, NULL, 0x0FFF, NULL, HFILL } }, { &hf_etag_res, { "Reserved", "etag.resv", FT_UINT16, BASE_DEC, NULL, 0xC000, NULL, HFILL } }, { &hf_etag_grp, { "GRP", "etag.group", FT_UINT16, BASE_DEC, VALS(grp_vals), 0x3000, NULL, HFILL } }, { &hf_etag_ecid_base, { "E-CID_base", "etag.ecid_base", FT_UINT16, BASE_HEX, NULL, 0xFFF, NULL, HFILL } }, { &hf_etag_iecid_ext, { "Ingress_E-CID_ext", "etag.iecid_ext", FT_UINT8, BASE_HEX, NULL, 0, NULL, HFILL } }, { &hf_etag_ecid_ext, { "E-CID_ext", "etag.ecid_ext", FT_UINT8, BASE_HEX, NULL, 0, NULL, HFILL } }, { &hf_etag_etype, { "Type", "etag.etype", FT_UINT16, BASE_HEX, VALS(etype_vals), 0x0, NULL, HFILL } }, { &hf_etag_trailer, { "Trailer", "etag.trailer", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL } }, }; static gint *ett[] = { &ett_etag }; module_t *etag_module; proto_etag = proto_register_protocol("802.1BR E-Tag", "ETAG", "etag"); proto_register_field_array(proto_etag, hf, array_length(hf)); proto_register_subtree_array(ett, array_length(ett)); etag_module = prefs_register_protocol(proto_etag, proto_reg_handoff_etag); prefs_register_bool_preference(etag_module, "summary_in_tree", "Show E-Tag summary in protocol tree", "Whether the E-Tag summary line should be shown in the protocol tree", &etag_summary_in_tree); } void proto_reg_handoff_etag(void) { dissector_handle_t etag_handle; etag_handle = create_dissector_handle(dissect_etag, proto_etag); dissector_add_uint("ethertype", ETHERTYPE_IEEE_802_1BR, etag_handle); ethertype_handle = find_dissector_add_dependency("ethertype", proto_etag); } /* * Editor modelines - http://www.wireshark.org/tools/modelines.html * * Local variables: * c-basic-offset: 4 * tab-width: 8 * indent-tabs-mode: t * End: * * vi: set shiftwidth=8 tabstop=8 noexpandtab: * :indentSize=8:tabSize=8:noTabs=false: */