![Anders Broman](/assets/img/avatar_default.png)
New ATM PW (with/without CW) dissector, RFC 4717 https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=3375 svn path=/trunk/; revision=27955
591 lines
21 KiB
C
591 lines
21 KiB
C
/* packet-pw-atm.c
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* Routines for ATM PW dissection: it should be conform to RFC 4717.
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*
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* Copyright 2009 _FF_
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*
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* Francesco Fondelli <francesco dot fondelli, gmail dot com>
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*
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* $Id$
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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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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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/*
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DONE:
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- ATM N-to-One Cell Mode (with CW)
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- ATM N-to-One Cell Mode (no CW)
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TODO:
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- ATM One-to-One Cell Mode
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- ATM AAL5 SDU Mode
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- ATM AAL5 PDU Mode
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Please pick an item from the TODO list, move code out of #if 0
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(see below) and implement a dissector for the given encapsulation
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mode. The N-to-One Cell Mode is the only mandatory encap
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mode. One-to-One/SDU/PDU modes are optional.
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <glib.h>
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#include <epan/packet.h>
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#include "packet-mpls.h"
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static gint proto_pw_atm_n2o_cw = -1;
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static gint proto_pw_atm_n2o_nocw = -1;
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#if 0
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static gint proto_pw_atm_o2o_cw = -1;
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static gint proto_pw_atm_o2o_nocw = -1;
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static gint proto_pw_atm_aal5_pdu_cw = -1;
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static gint proto_pw_atm_aal5_pdu_nocw = -1;
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static gint proto_pw_atm_aal5_sdu_cw = -1;
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static gint proto_pw_atm_aal5_sdu_nocw = -1;
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#endif
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static gint ett_pw_atm = -1;
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static int hf_pw_atm_n2o_cw = -1;
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static int hf_pw_atm_n2o_cw_flags = -1;
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static int hf_pw_atm_n2o_cw_length = -1;
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static int hf_pw_atm_n2o_cw_sequence_number = -1;
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static int hf_pw_atm_n2o_nocw = -1;
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#if 0
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static int hf_pw_atm_o2o_cw = -1;
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static int hf_pw_atm_o2o_cw_sequence_number = -1;
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static int hf_pw_atm_o2o_cw_flags = -1;
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static int hf_pw_atm_o2o_cw_flags_m = -1;
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static int hf_pw_atm_o2o_cw_flags_v = -1;
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static int hf_pw_atm_o2o_cw_flags_res = -1;
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static int hf_pw_atm_o2o_cw_flags_pti = -1;
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static int hf_pw_atm_o2o_cw_flags_c = -1;
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static int hf_pw_atm_o2o_nocw = -1;
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static int hf_pw_atm_aal5_pdu_cw = -1;
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static int hf_pw_atm_aal5_pdu_cw_sequence_number = -1;
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static int hf_pw_atm_aal5_pdu_nocw = -1;
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static int hf_pw_atm_aal5_sdu_cw = -1;
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static int hf_pw_atm_aal5_sdu_cw_sequence_number = -1;
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static int hf_pw_atm_aal5_sdu_nocw = -1;
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#endif
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static dissector_handle_t data_h;
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static dissector_handle_t atm_h;
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/* ATM One-to-One Cell Mode bits in "ATM Specific" CW field */
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#define PW_ATM_O2O_CW_M 0x80
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#define PW_ATM_O2O_CW_V 0x40
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#define PW_ATM_O2O_CW_RES 0x30
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#define PW_ATM_O2O_CW_PTI 0x0E
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#define PW_ATM_O2O_CW_C 0x01
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static void
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dissect_pw_atm_n2o_cw(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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proto_tree *pw_atm_tree = NULL;
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proto_item *ti = NULL;
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tvbuff_t *next_tvb = NULL;
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guint16 sequence_number = 0;
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guint8 flags = 0;
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guint8 length = 0;
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guint16 ncells = 0;
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guint16 remains = 0;
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guint16 i = 0;
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if (tvb_reported_length_remaining(tvb, 0) < 4) {
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if (tree)
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proto_tree_add_text(tree, tvb, 0, -1,
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"Error processing Message");
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return;
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}
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if (tree) {
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ti = proto_tree_add_boolean(tree, hf_pw_atm_n2o_cw,
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tvb, 0, 0, TRUE);
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PROTO_ITEM_SET_HIDDEN(ti);
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ti = proto_tree_add_item(tree, proto_pw_atm_n2o_cw,
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tvb, 0, 4, FALSE);
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pw_atm_tree = proto_item_add_subtree(ti, ett_pw_atm);
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if (pw_atm_tree == NULL)
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return;
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flags = tvb_get_guint8(tvb, 0) & 0x0F;
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proto_tree_add_uint_format(
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pw_atm_tree,
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hf_pw_atm_n2o_cw_flags,
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tvb, 0, 1, flags,
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"Flags: 0x%02x",
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flags);
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length = tvb_get_guint8(tvb, 1) & 0x3F;
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proto_tree_add_uint_format(
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pw_atm_tree,
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hf_pw_atm_n2o_cw_length,
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tvb, 1, 1, length,
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"Length: %u",
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flags);
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sequence_number = tvb_get_ntohs(tvb, 2);
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proto_tree_add_uint_format(
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pw_atm_tree,
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hf_pw_atm_n2o_cw_sequence_number,
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tvb, 2, 2, sequence_number,
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"Sequence Number: %u",
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sequence_number);
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}
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/* FF: pass info to the ATM dissector, see packet_info.h for details */
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pinfo->pw_atm_encap_type = 1;
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/*
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* FF: RFC 4717: "The number of cells encapsulated in a particular
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* frame can be inferred by the frame length" but "if the control
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* word is used, then the flag and length bits in the control word
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* are not used [and must be set to 0]" so... no reported_length in
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* tvb_new_subset().
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*/
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ncells = tvb_length_remaining(tvb, 4) / 52;
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pinfo->pw_atm_ncells = ncells;
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remains = tvb_length_remaining(tvb, 4) % 52;
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for (i = 0; i < ncells; i++) {
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next_tvb = tvb_new_subset(tvb,
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4 + (i * 52),
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52,
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-1);
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call_dissector(atm_h, next_tvb, pinfo, tree);
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}
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/*
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* FF: RFC 4717 "if the pseudowire traverses a network link that
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* requires a minimum frame size, with a minimum frame size of 64
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* octets, then such links will apply padding to the pseudowire PDU
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* to reach its minimum frame size" or this is a malformed PDU,
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* anyway...
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*/
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if (remains) {
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next_tvb = tvb_new_subset(tvb,
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4 + (i * 52),
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remains,
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-1);
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call_dissector(data_h, next_tvb, pinfo, tree);
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}
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}
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static void
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dissect_pw_atm_n2o_nocw(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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proto_item *ti = NULL;
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tvbuff_t *next_tvb = NULL;
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guint16 ncells = 0;
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guint16 remains = 0;
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guint16 i = 0;
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/*
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* FF: all comments in dissect_pw_atm_n2o_cw() apply here
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* as well, thus not repeated.
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*/
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if (tvb_reported_length_remaining(tvb, 0) < 52) {
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if (tree)
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proto_tree_add_text(tree, tvb, 0, -1,
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"Error processing Message");
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return;
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}
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if (tree) {
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ti = proto_tree_add_boolean(tree, hf_pw_atm_n2o_nocw,
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tvb, 0, 0, TRUE);
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PROTO_ITEM_SET_HIDDEN(ti);
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}
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pinfo->pw_atm_encap_type = 1;
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ncells = tvb_length_remaining(tvb, 0) / 52;
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pinfo->pw_atm_ncells = ncells;
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remains = tvb_length_remaining(tvb, 0) % 52;
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for (i = 0; i < ncells; i++) {
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next_tvb = tvb_new_subset(tvb,
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(i * 52),
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52,
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-1);
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call_dissector(atm_h, next_tvb, pinfo, tree);
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}
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if (remains) {
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next_tvb = tvb_new_subset(tvb,
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(i * 52),
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remains,
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-1);
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call_dissector(data_h, next_tvb, pinfo, tree);
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}
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}
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#if 0
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static void
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dissect_pw_atm_o2o_cw(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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(void)tvb;
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(void)pinfo;
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(void)tree;
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}
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static void
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dissect_pw_atm_o2o_nocw(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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(void)tvb;
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(void)pinfo;
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(void)tree;
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}
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static void
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dissect_pw_atm_aal5_pdu_cw(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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(void)tvb;
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(void)pinfo;
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(void)tree;
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}
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static void
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dissect_pw_atm_aal5_pdu_nocw(tvbuff_t *tvb, packet_info *pinfo,
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proto_tree *tree)
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{
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(void)tvb;
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(void)pinfo;
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(void)tree;
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}
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static void
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dissect_pw_atm_aal5_sdu_cw(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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(void)tvb;
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(void)pinfo;
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(void)tree;
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}
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static void
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dissect_pw_atm_aal5_sdu_nocw(tvbuff_t *tvb, packet_info *pinfo,
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proto_tree *tree)
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{
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(void)tvb;
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(void)pinfo;
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(void)tree;
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}
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#endif
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void
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proto_register_pw_atm(void)
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{
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static hf_register_info hf[] = {
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/* FF: general */
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{
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&hf_pw_atm_n2o_cw,
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{
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"ATM PW, N-to-one Cell Mode (with CW)",
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"pw_atm_n2o_cw", FT_BOOLEAN,
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0, NULL, 0x0, NULL, HFILL
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}
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},
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{
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&hf_pw_atm_n2o_nocw,
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{
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"ATM PW, N-to-one Cell Mode (no CW)",
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"pw_atm_n2o_nocw", FT_BOOLEAN,
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0, NULL, 0x0, NULL, HFILL
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}
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},
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#if 0
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{
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&hf_pw_atm_o2o_cw,
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{
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"ATM PW, One-to-one Cell Mode (with CW)",
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"pw_atm_o2o_cw", FT_BOOLEAN,
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0, NULL, 0x0, NULL, HFILL
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}
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},
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{
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&hf_pw_atm_o2o_nocw,
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{
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"ATM PW, One-to-one Cell Mode (no CW)",
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"pw_atm_o2o_nocw", FT_BOOLEAN,
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0, NULL, 0x0, NULL, HFILL
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}
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},
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{
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&hf_pw_atm_aal5_pdu_cw,
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{
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"ATM PW, AAL5 PDU Frame Mode (with CW)",
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"pw_atm_aal5_pdu_cw", FT_BOOLEAN,
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0, NULL, 0x0, NULL, HFILL
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}
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},
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{
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&hf_pw_atm_aal5_pdu_nocw,
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{
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"ATM PW, AAL5 PDU Frame Mode (no CW)",
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"pw_atm_aal5_pdu_nocw", FT_BOOLEAN,
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0, NULL, 0x0, NULL, HFILL
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}
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},
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{
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&hf_pw_atm_aal5_sdu_cw,
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{
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"ATM PW, AAL5 SDU Frame Mode (with CW)",
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"pw_atm_aal5_sdu_cw", FT_BOOLEAN,
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0, NULL, 0x0, NULL, HFILL
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}
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},
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{
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&hf_pw_atm_aal5_sdu_nocw,
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{
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"ATM PW, AAL5 SDU Frame Mode (no CW)",
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"pw_atm_aal5_sdu_nocw", FT_BOOLEAN,
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0, NULL, 0x0, NULL, HFILL
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}
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},
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/* FF: ATM One-to-one Cell Mode Control Word fields */
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{
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&hf_pw_atm_o2o_cw_sequence_number,
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{
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"ATM One-to-one Cell Mode sequence number",
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"pw_atm_o2o_cw_sequence_number", FT_UINT16,
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BASE_DEC, NULL, 0x0, NULL, HFILL
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}
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},
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{
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&hf_pw_atm_o2o_cw_flags,
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{
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"ATM One-to-one Cell Mode flags",
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"pw_atm_o2o_cw_flags", FT_UINT8,
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BASE_HEX, NULL, 0x0, NULL, HFILL
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}
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},
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{
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&hf_pw_atm_o2o_cw_flags_m,
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{
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"M (transport mode) bit",
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"pw_atm_o2o_cw_flags_m", FT_BOOLEAN,
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8, TFS(&flags_set_truth), PW_ATM_O2O_CW_M,
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NULL, HFILL
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}
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},
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{
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&hf_pw_atm_o2o_cw_flags_v,
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{
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"V (VCI present) bit",
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"pw_atm_o2o_cw_flags_v", FT_BOOLEAN,
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8, TFS(&flags_set_truth), PW_ATM_O2O_CW_V,
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NULL, HFILL
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}
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},
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{
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&hf_pw_atm_o2o_cw_flags_res,
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{
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"Reserved bits",
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"pw_atm_o2o_cw_flags_res", FT_BOOLEAN,
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8, TFS(&flags_set_truth), PW_ATM_O2O_CW_RES,
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NULL, HFILL
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}
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},
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{
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&hf_pw_atm_o2o_cw_flags_pti,
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{
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"PTI bits",
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"pw_atm_o2o_cw_flags_pti", FT_BOOLEAN,
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8, TFS(&flags_set_truth), PW_ATM_O2O_CW_PTI,
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NULL, HFILL
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}
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},
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{
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&hf_pw_atm_o2o_cw_flags_c,
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{
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"C (CLP) bit",
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"pw_atm_o2o_cw_flags_c", FT_BOOLEAN,
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8, TFS(&flags_set_truth), PW_ATM_O2O_CW_C,
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NULL, HFILL
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}
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},
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/* FF: AAL5 PDU Frame Mode Control Word fields */
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{
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&hf_pw_atm_aal5_pdu_cw_sequence_number,
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{
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"AAL5 PDU Frame Mode sequence number",
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"pw_atm_aal5_pdu_cw_sequence_number",
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FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL
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}
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},
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/* FF: AAL5 SDU Frame Mode Control Word fields */
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{
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&hf_pw_atm_aal5_sdu_cw_sequence_number,
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{
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"AAL5 SDU Frame Mode sequence number",
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"pw_atm_aal5_sdu_cw_sequence_number",
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FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL
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}
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},
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#endif
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/* FF: ATM N-to-one Cell Mode Control Word fields */
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{
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&hf_pw_atm_n2o_cw_flags,
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{
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"ATM N-to-one Cell Mode flags",
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"pw_atm_n2o_cw_flags", FT_UINT8,
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BASE_HEX, NULL, 0x0, NULL, HFILL
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}
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},
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{
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&hf_pw_atm_n2o_cw_length,
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{
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"ATM N-to-one Cell Mode flags",
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"pw_atm_n2o_cw_length", FT_UINT8,
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BASE_HEX, NULL, 0x0, NULL, HFILL
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}
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},
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{
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&hf_pw_atm_n2o_cw_sequence_number,
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{
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"ATM N-to-one Cell Mode sequence number",
|
|
"pw_atm_n2o_cw_sequence_number", FT_UINT16,
|
|
BASE_DEC, NULL, 0x0, NULL, HFILL
|
|
}
|
|
},
|
|
};
|
|
|
|
static gint *ett[] = {
|
|
&ett_pw_atm
|
|
};
|
|
|
|
proto_pw_atm_n2o_cw =
|
|
proto_register_protocol("ATM PW, N-to-one Cell Mode Control Word",
|
|
"ATM PW, N-to-one Cell Mode (with CW)",
|
|
"pw_atm_n2o_cw");
|
|
proto_pw_atm_n2o_nocw =
|
|
proto_register_protocol("ATM PW, N-to-one Cell Mode (no CW)",
|
|
"ATM PW, N-to-one Cell Mode (no CW)",
|
|
"pw_atm_n2o_nocw");
|
|
#if 0
|
|
proto_pw_atm_o2o_cw =
|
|
proto_register_protocol("ATM PW, One-to-one Cell Mode Control Word",
|
|
"ATM PW, One-to-one Cell Mode (with CW)",
|
|
"pw_atm_o2o_cw");
|
|
proto_pw_atm_o2o_nocw =
|
|
proto_register_protocol("ATM PW, One-to-one Cell Mode (no CW)",
|
|
"ATM PW, One-to-one Cell Mode (no CW)",
|
|
"pw_atm_o2o_nocw");
|
|
proto_pw_atm_aal5_pdu_cw =
|
|
proto_register_protocol("ATM PW, AAL5 PDU Frame Mode Control Word",
|
|
"ATM PW, AAL5 PDU Frame Mode (with CW)",
|
|
"pw_atm_aal5_pdu_cw");
|
|
proto_pw_atm_aal5_pdu_nocw =
|
|
proto_register_protocol("ATM PW, AAL5 PDU Frame Mode (no CW)",
|
|
"ATM PW, AAL5 PDU Frame Mode (no CW)",
|
|
"pw_atm_aal5_pdu_nocw");
|
|
proto_pw_atm_aal5_sdu_cw =
|
|
proto_register_protocol("ATM PW, AAL5 SDU Frame Mode Control Word",
|
|
"ATM PW, AAL5 SDU Frame Mode (with CW)",
|
|
"pw_atm_aal5_sdu_cw");
|
|
proto_pw_atm_aal5_sdu_nocw =
|
|
proto_register_protocol("ATM PW, AAL5 SDU Frame Mode (no CW)",
|
|
"ATM PW, AAL5 SDU Frame Mode (no CW)",
|
|
"pw_atm_aal5_sdu_nocw");
|
|
#endif
|
|
|
|
proto_register_field_array(proto_pw_atm_n2o_cw, hf, array_length(hf));
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
|
|
register_dissector("pw_atm_n2o_cw",
|
|
dissect_pw_atm_n2o_cw,
|
|
proto_pw_atm_n2o_cw);
|
|
register_dissector("pw_atm_n2o_nocw",
|
|
dissect_pw_atm_n2o_nocw,
|
|
proto_pw_atm_n2o_nocw);
|
|
#if 0
|
|
register_dissector("pw_atm_o2o_cw",
|
|
dissect_pw_atm_o2o_cw,
|
|
proto_pw_atm_o2o_cw);
|
|
register_dissector("pw_atm_o2o_nocw",
|
|
dissect_pw_atm_o2o_nocw,
|
|
proto_pw_atm_o2o_nocw);
|
|
register_dissector("pw_atm_aal5_pdu_cw",
|
|
dissect_pw_atm_aal5_pdu_cw,
|
|
proto_pw_atm_aal5_pdu_cw);
|
|
register_dissector("pw_atm_aal5_pdu_nocw",
|
|
dissect_pw_atm_aal5_pdu_nocw,
|
|
proto_pw_atm_aal5_pdu_nocw);
|
|
register_dissector("pw_atm_aal5_sdu_cw",
|
|
dissect_pw_atm_aal5_sdu_cw,
|
|
proto_pw_atm_aal5_sdu_cw);
|
|
register_dissector("pw_atm_aal5_sdu_nocw",
|
|
dissect_pw_atm_aal5_sdu_nocw,
|
|
proto_pw_atm_aal5_sdu_nocw);
|
|
#endif
|
|
}
|
|
|
|
void
|
|
proto_reg_handoff_pw_atm(void)
|
|
{
|
|
dissector_handle_t pw_atm_n2o_cw_h;
|
|
dissector_handle_t pw_atm_n2o_nocw_h;
|
|
#if 0
|
|
dissector_handle_t pw_atm_o2o_cw_h;
|
|
dissector_handle_t pw_atm_o2o_nocw_h;
|
|
dissector_handle_t pw_atm_aal5_pdu_cw_h;
|
|
dissector_handle_t pw_atm_aal5_pdu_nocw_h;
|
|
dissector_handle_t pw_atm_aal5_sdu_cw_h;
|
|
dissector_handle_t pw_atm_aal5_sdu_nocw_h;
|
|
#endif
|
|
|
|
pw_atm_n2o_cw_h = find_dissector("pw_atm_n2o_cw");
|
|
dissector_add("mpls.label", LABEL_INVALID, pw_atm_n2o_cw_h);
|
|
|
|
pw_atm_n2o_nocw_h = find_dissector("pw_atm_n2o_nocw");
|
|
dissector_add("mpls.label", LABEL_INVALID, pw_atm_n2o_nocw_h);
|
|
#if 0
|
|
pw_atm_o2o_cw_h = find_dissector("pw_atm_o2o_cw");
|
|
dissector_add("mpls.label", LABEL_INVALID, pw_atm_o2o_cw_h);
|
|
|
|
pw_atm_o2o_nocw_h = find_dissector("pw_atm_o2o_nocw");
|
|
dissector_add("mpls.label", LABEL_INVALID, pw_atm_o2o_nocw_h);
|
|
|
|
pw_atm_aal5_pdu_cw_h = find_dissector("pw_atm_aal5_pdu_cw");
|
|
dissector_add("mpls.label", LABEL_INVALID, pw_atm_aal5_pdu_cw_h);
|
|
|
|
pw_atm_aal5_pdu_nocw_h = find_dissector("pw_atm_aal5_pdu_nocw");
|
|
dissector_add("mpls.label", LABEL_INVALID, pw_atm_aal5_pdu_nocw_h);
|
|
|
|
pw_atm_aal5_sdu_cw_h = find_dissector("pw_atm_aal5_sdu_cw");
|
|
dissector_add("mpls.label", LABEL_INVALID, pw_atm_aal5_sdu_cw_h);
|
|
|
|
pw_atm_aal5_sdu_nocw_h = find_dissector("pw_atm_aal5_sdu_nocw");
|
|
dissector_add("mpls.label", LABEL_INVALID, pw_atm_aal5_sdu_nocw_h);
|
|
#endif
|
|
|
|
data_h = find_dissector("data");
|
|
atm_h = find_dissector("atm_4717");
|
|
}
|