forked from osmocom/wireshark
218 lines
6.9 KiB
C
218 lines
6.9 KiB
C
/* packet-trill.c
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* Routines for TRILL (TRansparent Interconnection of Lots of Links) dissection
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* Copyright 2010, David Bond <mokon@mokon.net>
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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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* See: RFC6325
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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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void proto_register_trill(void);
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void proto_reg_handoff_trill(void);
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static int proto_trill = -1 ;
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static gint ett_trill = -1 ;
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static int hf_trill_version = -1 ;
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static int hf_trill_reserved = -1 ;
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static int hf_trill_multi_dst = -1 ;
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static int hf_trill_op_len = -1 ;
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static int hf_trill_hop_cnt = -1 ;
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static int hf_trill_egress_nick = -1 ;
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static int hf_trill_ingress_nick = -1 ;
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/* TODO For now we will just add all the options into a byte field.
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Later this should be parsed out into a sub-tree with all the option
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details. */
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static int hf_trill_options= -1 ;
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static dissector_handle_t eth_dissector ;
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#define TRILL_VERSION_MASK 0xC000
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#define TRILL_RESERVED_MASK 0x3000
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#define TRILL_MULTI_DST_MASK 0x0800
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#define TRILL_OP_LEN_MASK 0x07C0
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#define TRILL_HOP_CNT_MASK 0x003F
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#define TRILL_PROTO_COL_NAME "TRILL"
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#define TRILL_PROTO_COL_INFO "TRILL Encapsulated Frame"
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#define TRILL_MIN_FRAME_LENGTH 6
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#define TRILL_BIT_FIELDS_LEN 2
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#define TRILL_NICKNAME_LEN 2
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#define TRILL_OP_LENGTH_BYTE_UNITS 0x4
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static const true_false_string multi_dst_strings = {
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"Multi-Destination TRILL Frame",
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"Known Unicast TRILL Frame"
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} ;
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static const range_string version_strings[] = {
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{ 0, 0, "RFC6325 Version" },
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{ 1, 3, "Unallocated Version" },
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{ 0, 0, NULL }
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} ;
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static const range_string reserved_strings[] = {
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{ 0, 0, "Legal Value" },
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{ 1, 3, "Illegal Value" },
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{ 0, 0, NULL }
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} ;
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static const range_string nickname_strings[] = {
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{ 0x0000, 0x0000, "Nickname Not Specified" },
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{ 0x0001, 0xFFBF, "Valid Nickname" },
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{ 0xFFC0, 0xFFC0, "Any RBridge" },
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{ 0xFFC1, 0xFFC1, "OOMF" },
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{ 0xFFC2, 0xFFFE, "Reserved for Future Specification" },
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{ 0xFFFF, 0xFFFF, "Permanently Reserved" },
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{ 0, 0, NULL }
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} ;
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/* Trill Dissector */
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static int
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dissect_trill( tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_ )
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{
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proto_item *ti ;
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proto_tree *trill_tree ;
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guint32 op_len ;
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tvbuff_t *next_tvb ;
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int offset = 0 ;
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col_set_str( pinfo->cinfo, COL_PROTOCOL, TRILL_PROTO_COL_NAME ) ;
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col_set_str( pinfo->cinfo, COL_INFO, TRILL_PROTO_COL_INFO ) ;
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op_len = tvb_get_bits( tvb, 5, 5, ENC_BIG_ENDIAN ) * TRILL_OP_LENGTH_BYTE_UNITS ;
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if (tree) {
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ti = proto_tree_add_item( tree, proto_trill, tvb, 0,
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TRILL_MIN_FRAME_LENGTH + op_len, ENC_NA ) ;
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trill_tree = proto_item_add_subtree( ti, ett_trill ) ;
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/* Parse the bit fields, i.e. V, R, M, Op-Length, Hop Count. */
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proto_tree_add_item( trill_tree, hf_trill_version, tvb, offset,
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TRILL_BIT_FIELDS_LEN, ENC_BIG_ENDIAN ) ;
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proto_tree_add_item( trill_tree, hf_trill_reserved, tvb, offset,
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TRILL_BIT_FIELDS_LEN, ENC_BIG_ENDIAN ) ;
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proto_tree_add_item( trill_tree, hf_trill_multi_dst, tvb, offset,
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TRILL_BIT_FIELDS_LEN, ENC_BIG_ENDIAN ) ;
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proto_tree_add_item( trill_tree, hf_trill_op_len, tvb, offset,
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TRILL_BIT_FIELDS_LEN, ENC_BIG_ENDIAN ) ;
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proto_tree_add_item( trill_tree, hf_trill_hop_cnt, tvb, offset,
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TRILL_BIT_FIELDS_LEN, ENC_BIG_ENDIAN ) ;
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/* Parse the egress nickname. */
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offset += TRILL_BIT_FIELDS_LEN ;
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proto_tree_add_item( trill_tree, hf_trill_egress_nick, tvb, offset,
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TRILL_NICKNAME_LEN, ENC_BIG_ENDIAN ) ;
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/* Parse the ingress nickname. */
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offset += TRILL_NICKNAME_LEN ;
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proto_tree_add_item( trill_tree, hf_trill_ingress_nick, tvb, offset,
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TRILL_NICKNAME_LEN , ENC_BIG_ENDIAN ) ;
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/* Parse the options field. */
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offset += TRILL_NICKNAME_LEN ;
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if( op_len != 0 ) {
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proto_tree_add_item( trill_tree, hf_trill_options, tvb,
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offset, op_len, ENC_NA ) ;
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}
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}
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/* call the eth dissector */
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next_tvb = tvb_new_subset_remaining( tvb, TRILL_MIN_FRAME_LENGTH + op_len ) ;
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call_dissector( eth_dissector, next_tvb, pinfo, tree ) ;
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return tvb_reported_length( tvb ) ;
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}
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/* Register the protocol with Wireshark */
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void
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proto_register_trill(void)
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{
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static hf_register_info hf[] = {
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{ &hf_trill_version,
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{ "Version", "trill.version",
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FT_UINT16, BASE_DEC_HEX|BASE_RANGE_STRING, RVALS(version_strings),
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TRILL_VERSION_MASK, "The TRILL version number.", HFILL }},
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{ &hf_trill_reserved,
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{ "Reserved", "trill.reserved",
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FT_UINT16, BASE_DEC_HEX|BASE_RANGE_STRING, RVALS(reserved_strings),
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TRILL_RESERVED_MASK, "Bits reserved for future specification.", HFILL }},
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{ &hf_trill_multi_dst,
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{ "Multi Destination", "trill.multi_dst",
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FT_BOOLEAN, 16, TFS(&multi_dst_strings), TRILL_MULTI_DST_MASK,
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"A boolean specifying if this is a multi-destination frame.", HFILL }},
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{ &hf_trill_op_len,
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{ "Option Length", "trill.op_len",
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FT_UINT16, BASE_DEC_HEX, NULL, TRILL_OP_LEN_MASK,
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"The length of the options field of this frame.", HFILL }},
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{ &hf_trill_hop_cnt,
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{ "Hop Count", "trill.hop_cnt",
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FT_UINT16, BASE_DEC_HEX, NULL, TRILL_HOP_CNT_MASK,
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"The remaining hop count for this frame.", HFILL }},
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{ &hf_trill_egress_nick,
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{ "Egress/Root RBridge Nickname", "trill.egress_nick",
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FT_UINT16, BASE_DEC_HEX|BASE_RANGE_STRING, RVALS(nickname_strings), 0x0,
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"The Egress or Distribution Tree Root RBridge Nickname.", HFILL }},
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{ &hf_trill_ingress_nick,
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{ "Ingress RBridge Nickname", "trill.ingress_nick",
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FT_UINT16, BASE_DEC_HEX|BASE_RANGE_STRING, RVALS(nickname_strings), 0x0,
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"The Ingress RBridge Nickname.", HFILL }},
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{ &hf_trill_options,
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{ "Options", "trill.options",
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FT_BYTES, BASE_NONE, NULL, 0x0,
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"The TRILL Options field.", HFILL }}
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};
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static gint *ett[] = {
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&ett_trill
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};
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proto_trill = proto_register_protocol("TRILL", "TRILL", "trill");
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proto_register_field_array(proto_trill, 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_trill(void)
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{
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dissector_handle_t trill_handle;
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trill_handle = create_dissector_handle(dissect_trill, proto_trill);
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dissector_add_uint("ethertype", ETHERTYPE_TRILL, trill_handle);
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/*
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* RFC 6325, section 4.1.4 "Frame Check Sequence (FCS)", says
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*
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* "Thus, when a frame is encapsulated, the original FCS is not
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* included but is discarded."
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*
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* meaning that the inner Ethernet frame does *not* include an
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* FCS.
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*/
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eth_dissector = find_dissector_add_dependency( "eth_withoutfcs", proto_trill );
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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: 2
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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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* ex: set shiftwidth=2 tabstop=8 expandtab:
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* :indentSize=2:tabSize=8:noTabs=true:
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*/
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