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[wireshark-sm.git] / epan / dissectors / packet-etag.c
blobf2fe5088e78c11ef9cb922bffe4d6ecdbd8f566e
1 /* packet-etag.c
3 * 802.1BR E-Tag dissector
4 * Inspired by packet-vntag.c
6 * Copyright 2016 APCON, Inc.
7 * Kim Kempf <kim.kempf@apcon.com>
9 * Wireshark - Network traffic analyzer
10 * By Gerald Combs <gerald@wireshark.org>
11 * Copyright 1998 Gerald Combs
13 * SPDX-License-Identifier: GPL-2.0-or-later
17 #include "config.h"
19 #include <epan/packet.h>
20 #include <epan/etypes.h>
21 #include <epan/prefs.h>
23 void proto_register_etag(void);
24 void proto_reg_handoff_etag(void);
26 static dissector_handle_t etag_handle;
27 static dissector_handle_t ethertype_handle;
29 static int proto_etag;
31 static bool etag_summary_in_tree = true;
33 static int hf_etag_etype;
34 static int hf_etag_pcp;
35 static int hf_etag_dei;
36 static int hf_etag_res;
37 static int hf_etag_grp;
38 static int hf_etag_iecid_base;
39 static int hf_etag_iecid_ext;
40 static int hf_etag_ecid_base;
41 static int hf_etag_ecid_ext;
43 static int hf_etag_trailer;
45 static int ett_etag;
47 #define IEEE8021BR_LEN 8 /* length including ethertype */
49 /* From Table G-2 of IEEE standard 802.1D-2004 */
50 static const value_string pri_vals[] = {
51 { 1, "Background" },
52 { 2, "Spare" },
53 { 0, "Best Effort (default)" },
54 { 3, "Excellent Effort" },
55 { 4, "Controlled Load" },
56 { 5, "Video, < 100ms latency and jitter" },
57 { 6, "Voice, < 10ms latency and jitter" },
58 { 7, "Network Control" },
59 { 0, NULL }
63 static const value_string grp_vals[] = {
64 { 0, "Point-to-point" },
65 { 1, "Point-to-multipoint" },
66 { 2, "Point-to-multipoint" },
67 { 3, "Point-to-multipoint" },
68 { 0, NULL }
72 From 801.2BR 7.5 E-TAG Control Information
73 0 1
74 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
75 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
76 | |
77 | |
78 | E-Tag EtherType |
79 | 0x893F |
80 | |
81 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
82 | |E| |
83 | |-| |
84 |E-PCP|D| Ingress_E-CID_base |
85 | |E| |
86 | |I| |
87 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
88 | | | |
89 | R | G | |
90 | E | R | E-CID_base |
91 | S | P | |
92 | V | | |
93 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
94 | | |
95 | | |
96 |Ingress_E-CID_ | E_CID_ext |
97 | ext | |
98 | | |
99 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
102 static int
103 dissect_etag(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
105 uint16_t encap_proto;
106 proto_tree *etag_tree = NULL;
107 ethertype_data_t ethertype_data;
109 uint64_t tci;
111 /* Decoding per IEEE802.1BR-2012 */
112 static int * const fields1[] = {
113 &hf_etag_pcp,
114 &hf_etag_dei,
115 &hf_etag_iecid_base,
116 NULL
119 static int * const fields2[] = {
120 &hf_etag_res,
121 &hf_etag_grp,
122 &hf_etag_ecid_base,
123 NULL
126 tci = tvb_get_ntoh48( tvb, 0);
128 col_set_str(pinfo->cinfo, COL_PROTOCOL, "ETAG");
129 col_clear(pinfo->cinfo, COL_INFO);
131 if (tree) {
132 uint32_t e_cid, ing_e_cid;
134 proto_item *ti = proto_tree_add_item(tree, proto_etag, tvb, 0, IEEE8021BR_LEN - 2, ENC_NA);
136 e_cid = (uint32_t)((((tci >> 16) & 0xFFF) | (tci << 12)) & 0xFFFFF); /* E-CID_base | E-CID_ext */
137 ing_e_cid = (uint32_t)((((tci >> 32) & 0xFFF) | ((tci << 4) & 0xFF000)) & 0xFFFFF); /* Ingress_E-CID_base | Ingress_E-CID ext */
139 if (etag_summary_in_tree) {
140 proto_item_append_text(ti, ", TCI: 0x%" PRIx64 " Ingress_E-CID: %u E-CID: %u", tci, ing_e_cid, e_cid);
142 etag_tree = proto_item_add_subtree(ti, ett_etag);
144 proto_tree_add_bitmask_list(etag_tree, tvb, 0, 2, fields1, ENC_BIG_ENDIAN);
145 proto_tree_add_bitmask_list(etag_tree, tvb, 2, 2, fields2, ENC_BIG_ENDIAN);
147 proto_tree_add_item(etag_tree, hf_etag_iecid_ext, tvb, 4, 1, ENC_BIG_ENDIAN);
148 proto_tree_add_item(etag_tree, hf_etag_ecid_ext, tvb, 5, 1, ENC_BIG_ENDIAN);
151 encap_proto = tvb_get_ntohs(tvb, IEEE8021BR_LEN - 2);
152 proto_tree_add_uint(etag_tree, hf_etag_etype, tvb, IEEE8021BR_LEN - 2, 2, encap_proto);
154 ethertype_data.etype = encap_proto;
155 ethertype_data.payload_offset = IEEE8021BR_LEN;
156 ethertype_data.fh_tree = etag_tree;
157 ethertype_data.trailer_id = hf_etag_trailer;
158 ethertype_data.fcs_len = 0;
160 call_dissector_with_data(ethertype_handle, tvb, pinfo, tree, &ethertype_data);
162 return tvb_captured_length(tvb);
165 void
166 proto_register_etag(void)
168 static hf_register_info hf[] = {
169 { &hf_etag_pcp,
170 { "E-PCP", "etag.pcp", FT_UINT16, BASE_DEC, VALS(pri_vals), 0xE000,
171 "Descriptions are recommendations from IEEE standard 802.1D-2004", HFILL }
173 { &hf_etag_dei,
174 { "E-DEI", "etag.dei", FT_UINT16, BASE_DEC, NULL, 0x1000, NULL, HFILL }
176 { &hf_etag_iecid_base,
177 { "Ingress_E-CID_base", "etag.iecid_base", FT_UINT16, BASE_HEX, NULL, 0x0FFF, NULL, HFILL }
179 { &hf_etag_res,
180 { "Reserved", "etag.resv", FT_UINT16, BASE_DEC, NULL, 0xC000, NULL, HFILL }
182 { &hf_etag_grp,
183 { "GRP", "etag.group", FT_UINT16, BASE_DEC, VALS(grp_vals), 0x3000, NULL, HFILL }
185 { &hf_etag_ecid_base,
186 { "E-CID_base", "etag.ecid_base", FT_UINT16, BASE_HEX, NULL, 0x0FFF, NULL, HFILL }
188 { &hf_etag_iecid_ext,
189 { "Ingress_E-CID_ext", "etag.iecid_ext", FT_UINT8, BASE_HEX, NULL, 0, NULL, HFILL }
191 { &hf_etag_ecid_ext,
192 { "E-CID_ext", "etag.ecid_ext", FT_UINT8, BASE_HEX, NULL, 0, NULL, HFILL }
194 { &hf_etag_etype,
195 { "Type", "etag.etype", FT_UINT16, BASE_HEX, VALS(etype_vals), 0x0, NULL, HFILL }
197 { &hf_etag_trailer,
198 { "Trailer", "etag.trailer", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }
202 static int *ett[] = {
203 &ett_etag
206 module_t *etag_module;
208 proto_etag = proto_register_protocol("802.1BR E-Tag", "ETAG", "etag");
209 etag_handle = register_dissector("etag", dissect_etag, proto_etag);
210 proto_register_field_array(proto_etag, hf, array_length(hf));
211 proto_register_subtree_array(ett, array_length(ett));
213 etag_module = prefs_register_protocol(proto_etag, NULL);
214 prefs_register_bool_preference(etag_module, "summary_in_tree",
215 "Show E-Tag summary in protocol tree",
216 "Whether the E-Tag summary line should be shown in the protocol tree",
217 &etag_summary_in_tree);
220 void
221 proto_reg_handoff_etag(void)
223 dissector_add_uint("ethertype", ETHERTYPE_IEEE_802_1BR, etag_handle);
225 ethertype_handle = find_dissector_add_dependency("ethertype", proto_etag);
229 * Editor modelines - https://www.wireshark.org/tools/modelines.html
231 * Local variables:
232 * c-basic-offset: 4
233 * tab-width: 8
234 * indent-tabs-mode: t
235 * End:
237 * vi: set shiftwidth=8 tabstop=8 noexpandtab:
238 * :indentSize=8:tabSize=8:noTabs=false: