111 lines
3.3 KiB
C
111 lines
3.3 KiB
C
/* packet-diffserv-mpls-common.c
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* Routines for the common part of Diffserv MPLS signaling protocols
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* Author: Endoh Akira (endoh@netmarks.co.jp)
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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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* This module defines routines only for the common part of LDP
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* and RSVP to support for Diffserv MPLS as described in RFC 3270
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* and RFC 3140. Protocol specific routines of each signaling
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* protocol are defined in each dissector.
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*/
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#include "config.h"
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#include <epan/packet.h>
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#include "packet-diffserv-mpls-common.h"
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#define hf_map *hfindexes[0]
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#define hf_exp *hfindexes[1]
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#define hf_phbid *hfindexes[2]
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#define hf_phbid_dscp *hfindexes[3]
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#define hf_phbid_code *hfindexes[4]
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#define hf_phbid_bit14 *hfindexes[5]
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#define hf_phbid_bit15 *hfindexes[6]
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#define ett_map *etts[0]
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#define ett_map_phbid *etts[1]
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const value_string phbid_bit14_vals[] = {
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{0, "Single PHB"},
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{1, "Set of PHBs"},
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{0, NULL}
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};
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const value_string phbid_bit15_vals[] = {
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{0, "PHBs defined by standards action"},
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{1, "PHBs not defined by standards action"},
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{0, NULL}
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};
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void
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dissect_diffserv_mpls_common(tvbuff_t *tvb, proto_tree *tree, int type,
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int offset, int **hfindexes, gint **etts)
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{
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proto_item *ti = NULL, *sub_ti;
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proto_tree *tree2 = NULL, *phbid_subtree;
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int exp;
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guint16 phbid;
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switch (type) {
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case 1: /* E-LSP */
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ti = proto_tree_add_item(tree, hf_map, tvb, offset, 4, ENC_NA);
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tree2 = proto_item_add_subtree(ti, ett_map);
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proto_item_set_text(ti, "MAP: ");
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offset ++;
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exp = tvb_get_guint8(tvb, offset) & 7;
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proto_tree_add_uint(tree2, hf_exp, tvb, offset, 1, exp);
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proto_item_append_text(ti, "EXP %u, ", exp);
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offset ++;
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break;
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case 2: /* L-LSP */
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tree2 = tree;
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break;
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default:
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return;
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}
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/* PHBID subtree */
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sub_ti = proto_tree_add_item(tree2, hf_phbid, tvb, offset, 2, ENC_NA);
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phbid_subtree = proto_item_add_subtree(sub_ti, ett_map_phbid);
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proto_item_set_text(sub_ti, "%s: ", (type == 1) ? PHBID_DESCRIPTION : "PSC");
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phbid = tvb_get_ntohs(tvb, offset);
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if ((phbid & 1) == 0) {
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/* Case 1 of RFC 3140 */
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proto_tree_add_uint(phbid_subtree, hf_phbid_dscp,
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tvb, offset, 2, phbid);
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if (type == 1)
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proto_item_append_text(ti, "DSCP %u", phbid >> 10);
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proto_item_append_text(sub_ti, "DSCP %u", phbid >> 10);
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}
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else {
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/* Case 2 of RFC 3140 */
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proto_tree_add_uint(phbid_subtree, hf_phbid_code,
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tvb, offset, 2, phbid);
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if (type == 1)
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proto_item_append_text(ti, "PHB id code %u", phbid >> 4);
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proto_item_append_text(sub_ti, "PHB id code %u", phbid >> 4);
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}
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proto_tree_add_uint(phbid_subtree, hf_phbid_bit14, tvb, offset, 2, phbid);
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proto_tree_add_uint(phbid_subtree, hf_phbid_bit15, tvb, offset, 2, phbid);
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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: nil
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* End:
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*
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* vi: set shiftwidth=4 tabstop=8 expandtab:
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* :indentSize=4:tabSize=8:noTabs=true:
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*/
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