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/* packet-diffserv-mpls-common.c
* Routines for the common part of Diffserv MPLS signaling protocols
* Author: Endoh Akira (endoh@netmarks.co.jp)
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
/*
* This module defines routines only for the common part of LDP
* and RSVP to support for Diffserv MPLS as described in RFC 3270
* and RFC 3140. Protocol specific routines of each signaling
* protocol are defined in each dissector.
*/
#include "config.h"
#include <epan/packet.h>
#include "packet-diffserv-mpls-common.h"
#define hf_map *hfindexes[0]
#define hf_exp *hfindexes[1]
#define hf_phbid *hfindexes[2]
#define hf_phbid_dscp *hfindexes[3]
#define hf_phbid_code *hfindexes[4]
#define hf_phbid_bit14 *hfindexes[5]
#define hf_phbid_bit15 *hfindexes[6]
#define ett_map *etts[0]
#define ett_map_phbid *etts[1]
const value_string phbid_bit14_vals[] = {
{0, "Single PHB"},
{1, "Set of PHBs"},
{0, NULL}
};
const value_string phbid_bit15_vals[] = {
{0, "PHBs defined by standards action"},
{1, "PHBs not defined by standards action"},
{0, NULL}
};
void
dissect_diffserv_mpls_common(tvbuff_t *tvb, proto_tree *tree, int type,
int offset, int **hfindexes, gint **etts)
{
proto_item *ti = NULL, *sub_ti;
proto_tree *tree2 = NULL, *phbid_subtree;
int exp;
guint16 phbid;
switch (type) {
case 1: /* E-LSP */
ti = proto_tree_add_item(tree, hf_map, tvb, offset, 4, ENC_NA);
tree2 = proto_item_add_subtree(ti, ett_map);
proto_item_set_text(ti, "MAP: ");
offset ++;
exp = tvb_get_guint8(tvb, offset) & 7;
proto_tree_add_uint(tree2, hf_exp, tvb, offset, 1, exp);
proto_item_append_text(ti, "EXP %u, ", exp);
offset ++;
break;
case 2: /* L-LSP */
tree2 = tree;
break;
default:
return;
}
/* PHBID subtree */
sub_ti = proto_tree_add_item(tree2, hf_phbid, tvb, offset, 2, ENC_NA);
phbid_subtree = proto_item_add_subtree(sub_ti, ett_map_phbid);
proto_item_set_text(sub_ti, "%s: ", (type == 1) ? PHBID_DESCRIPTION : "PSC");
phbid = tvb_get_ntohs(tvb, offset);
if ((phbid & 1) == 0) {
/* Case 1 of RFC 3140 */
proto_tree_add_uint(phbid_subtree, hf_phbid_dscp,
tvb, offset, 2, phbid);
if (type == 1)
proto_item_append_text(ti, "DSCP %u", phbid >> 10);
proto_item_append_text(sub_ti, "DSCP %u", phbid >> 10);
}
else {
/* Case 2 of RFC 3140 */
proto_tree_add_uint(phbid_subtree, hf_phbid_code,
tvb, offset, 2, phbid);
if (type == 1)
proto_item_append_text(ti, "PHB id code %u", phbid >> 4);
proto_item_append_text(sub_ti, "PHB id code %u", phbid >> 4);
}
proto_tree_add_uint(phbid_subtree, hf_phbid_bit14, tvb, offset, 2, phbid);
proto_tree_add_uint(phbid_subtree, hf_phbid_bit15, tvb, offset, 2, phbid);
}
/*
* Editor modelines - https://www.wireshark.org/tools/modelines.html
*
* Local variables:
* c-basic-offset: 4
* tab-width: 8
* indent-tabs-mode: nil
* End:
*
* vi: set shiftwidth=4 tabstop=8 expandtab:
* :indentSize=4:tabSize=8:noTabs=true:
*/
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