2017-09-17 04:45:49 +00:00
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/* packet-brcm-tag.c
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* Routines for Broadcom tag dissection
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*
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* Copyright 2017, Florian Fainelli <f.fainelli[AT]gmail.com>
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald[AT]wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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2018-02-12 11:23:27 +00:00
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* SPDX-License-Identifier: GPL-2.0-or-later
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2017-09-17 04:45:49 +00:00
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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/ptvcursor.h>
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void proto_register_brcm_tag(void);
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void proto_reg_handoff_brcm_tag(void);
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#define BRCM_TAG_LEN 4
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#define BRCM_TAG_OPCODE_MASK 0x7
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#define BRCM_TAG_DEV_ID_MASK 0x3
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#define BRCM_TAG_SRC_DEV_ID_SHIFT 4
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#define BRCM_TAG_PORT_ID_MASK 0xF
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#define BRCM_TAG_OPCODE_UNICAST 0x0
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#define BRCM_TAG_OPCODE_MULTICAST 0x1
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#define BRCM_TAG_OPCODE_EG_DIRECT 0x2
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#define BRCM_TAG_OPCODE_IG_DIRECT 0x3
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#define BRCM_TAG_OPCODE_SHIFT 5
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#define BRCM_TAG_MR_SHIFT 4
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#define BRCM_TAG_MO_SHIFT 3
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static int proto_brcm_tag = -1;
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static int hf_brcm_tag_opcode = -1;
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static int hf_brcm_tag_frame_octet_cnt = -1;
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static int hf_brcm_tag_mr = -1;
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static int hf_brcm_tag_mo = -1;
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static int hf_brcm_tag_reserved = -1;
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static int hf_brcm_tag_dest_dev_id = -1;
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static int hf_brcm_tag_dest_port_id = -1;
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static int hf_brcm_tag_src_dev_id = -1;
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static int hf_brcm_tag_src_port_id = -1;
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static gint ett_brcm_tag = -1;
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#define TVB_LEN_GREATEST 1
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#define TVB_LEN_UNDEF 0
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#define TVB_LEN_SHORTEST -1
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static int check_tvb_length(ptvcursor_t *cursor, const gint length)
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{
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if (!cursor)
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return TVB_LEN_UNDEF;
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if (tvb_reported_length_remaining(ptvcursor_tvbuff(cursor),
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ptvcursor_current_offset(cursor)) < length)
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return TVB_LEN_SHORTEST;
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return TVB_LEN_GREATEST;
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}
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static const value_string brcm_tag_opcode_vals[] = {
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{ BRCM_TAG_OPCODE_UNICAST, "Unicast" },
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{ BRCM_TAG_OPCODE_MULTICAST, "Multicast" },
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{ BRCM_TAG_OPCODE_EG_DIRECT, "Egress directed" },
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{ BRCM_TAG_OPCODE_IG_DIRECT, "Ingress directed" },
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{ 0, NULL }
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};
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static int
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dissect_brcm_tag(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 *brcm_tag_tree;
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ptvcursor_t *cursor;
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guint8 opcode_mr_mo;
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guint8 opcode;
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "Broadcom tag");
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col_set_str(pinfo->cinfo, COL_INFO, "MAC Management");
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ti = proto_tree_add_item(tree, proto_brcm_tag, tvb, 0, -1, ENC_NA);
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brcm_tag_tree = proto_item_add_subtree(ti, ett_brcm_tag);
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cursor = ptvcursor_new(brcm_tag_tree, tvb, 0);
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/* Check if we have enough data to process the header */
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if (check_tvb_length(cursor, BRCM_TAG_LEN) != TVB_LEN_SHORTEST) {
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opcode_mr_mo = tvb_get_guint8(ptvcursor_tvbuff(cursor), ptvcursor_current_offset(cursor));
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opcode = (opcode_mr_mo >> BRCM_TAG_OPCODE_SHIFT) & BRCM_TAG_OPCODE_MASK;
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ptvcursor_add_no_advance(cursor, hf_brcm_tag_opcode, 1, ENC_NA);
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ptvcursor_add_no_advance(cursor, hf_brcm_tag_mr, 1, ENC_NA);
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ptvcursor_add(cursor, hf_brcm_tag_mo, 1, ENC_NA);
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ptvcursor_add(cursor, hf_brcm_tag_frame_octet_cnt, 2, ENC_BIG_ENDIAN);
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if (opcode == BRCM_TAG_OPCODE_UNICAST || opcode == BRCM_TAG_OPCODE_EG_DIRECT)
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ptvcursor_add(cursor, hf_brcm_tag_dest_dev_id, 1, ENC_NA);
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else
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ptvcursor_add(cursor, hf_brcm_tag_reserved, 1, ENC_NA);
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ptvcursor_add_no_advance(cursor, hf_brcm_tag_src_dev_id, 1, ENC_NA);
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if (opcode == BRCM_TAG_OPCODE_EG_DIRECT)
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ptvcursor_add_no_advance(cursor, hf_brcm_tag_dest_port_id, 1, ENC_NA);
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else
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ptvcursor_add_no_advance(cursor, hf_brcm_tag_src_port_id, 1, ENC_NA);
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}
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ptvcursor_free(cursor);
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return tvb_captured_length(tvb);
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}
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void
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proto_register_brcm_tag(void)
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{
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static hf_register_info hf[] = {
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{ &hf_brcm_tag_opcode,
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{ "Opcode", "brcm_tag.opcode",
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FT_UINT8, BASE_HEX, VALS(brcm_tag_opcode_vals),
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BRCM_TAG_OPCODE_MASK << BRCM_TAG_OPCODE_SHIFT, NULL, HFILL }
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},
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{ &hf_brcm_tag_mr,
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{ "Mirror bit", "brcm_tag.mr",
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FT_UINT8, BASE_HEX, NULL, 1 << BRCM_TAG_MR_SHIFT, NULL, HFILL }
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},
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{ &hf_brcm_tag_mo,
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{ "Mirror only", "brcm_tag.mo",
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FT_UINT8, BASE_HEX, NULL, 1 << BRCM_TAG_MO_SHIFT, NULL, HFILL }
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},
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{ &hf_brcm_tag_reserved,
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{ "Reserved", "brcm_tag.reserved",
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FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL }
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},
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{ &hf_brcm_tag_frame_octet_cnt,
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{ "Frame octet count", "brcm_tag.frame_octet_cnt",
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FT_UINT16, BASE_DEC, NULL, 0xFFF, NULL, HFILL }
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},
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{ &hf_brcm_tag_dest_dev_id,
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{ "Destination device ID", "brcm_tag.dest_dev_id",
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FT_UINT8, BASE_DEC, NULL, BRCM_TAG_DEV_ID_MASK, NULL, HFILL }
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},
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{ &hf_brcm_tag_dest_port_id,
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{ "Destination port ID", "brcm_tag.dest_port_id",
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FT_UINT8, BASE_DEC, NULL, BRCM_TAG_PORT_ID_MASK, NULL, HFILL }
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},
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{ &hf_brcm_tag_src_dev_id,
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{ "Source device ID", "brcm_tag.src_dev_id",
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FT_UINT8, BASE_DEC, NULL, BRCM_TAG_DEV_ID_MASK << BRCM_TAG_SRC_DEV_ID_SHIFT, NULL, HFILL }
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},
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{ &hf_brcm_tag_src_port_id,
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{ "Source port ID", "brcm_tag.src_port_id",
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FT_UINT8, BASE_DEC, NULL, BRCM_TAG_PORT_ID_MASK, NULL, HFILL }
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},
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};
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static gint *ett[] = {
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&ett_brcm_tag,
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};
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proto_brcm_tag = proto_register_protocol("Broadcom tag protocol", "Broadcom tag", "brcm-tag");
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proto_register_field_array(proto_brcm_tag, 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_brcm_tag(void)
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{
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dissector_handle_t brcm_tag_handle;
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brcm_tag_handle = create_dissector_handle(dissect_brcm_tag, proto_brcm_tag);
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dissector_add_uint("ethertype", ETHERTYPE_BRCM_TYPE, brcm_tag_handle);
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}
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/*
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* Editor modelines
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*
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* Local Variables:
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* c-basic-offset: 3
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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=3 tabstop=8 expandtab:
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* :indentSize=3:tabSize=8:noTabs=true:
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*/
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