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wireshark/packet-lmi.c
Guy Harris ee5ca25d31 Include files from the "epan" directory and subdirectories thereof with 
"epan/..." pathnames, so as to avoid collisions with header files in any
of the directories in which we look (e.g., "proto.h", as some other
package has its own "proto.h" file which it installs in the top-level
include directory).

Don't add "-I" flags to search "epan", as that's no longer necessary
(and we want includes of "epan" headers to fail if the "epan/" is left
out, so that we don't re-introduce includes lacking "epan/").

svn path=/trunk/; revision=4586
2002-01-21 07:37:49 +00:00

254 lines
7.5 KiB
C
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/* packet-lmi.c
* Routines for Frame Relay Local Management Interface (LMI) disassembly
* Copyright 2001, Jeffrey C. Foster <jfoste@woodward.com>
*
* $Id: packet-lmi.c,v 1.9 2002/01/21 07:36:37 guy Exp $
*
* Ethereal - Network traffic analyzer
* By Gerald Combs <gerald@ethereal.com>
* Copyright 1998
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* ToDo:
*
* References:
*
* http://www.techfest.com/networking/wan/frrel.htm
* http://www.frforum.com/5000/frf1_2.pdf
* http://www.cisco.com/univercd/cc/td/doc/cisintwk/ito_doc/frame.htm#xtocid125314
* http://www.net.aapt.com.au/techref/lmimess.htm
* http://www.raleigh.ibm.com:80/cgi-bin/bookmgr/BOOKS/EZ305800/1.2.4.4
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#ifdef HAVE_SYS_TYPES_H
# include <sys/types.h>
#endif
#include <stdio.h>
#include <glib.h>
#include <string.h>
#include <epan/packet.h>
#include "nlpid.h"
static int proto_lmi = -1;
static int hf_lmi_call_ref = -1;
static int hf_lmi_msg_type = -1;
static int hf_lmi_inf_ele = -1;
static int hf_lmi_inf_len = -1;
static int hf_lmi_rcd_type = -1;
static int hf_lmi_send_seq = -1;
static int hf_lmi_recv_seq = -1;
static int hf_lmi_dlci_high = -1;
static int hf_lmi_dlci_low = -1;
static int hf_lmi_new = -1;
static int hf_lmi_act = -1;
static gint ett_lmi = -1;
static gint ett_lmi_ele = -1;
#ifdef _OLD_
/*
* Bits in the address field.
*/
#define LMI_CMD 0xf000 /* LMI Command */
#define LMI_SEQ 0x0fff /* LMI Sequence number */
#endif
static const value_string msg_type_str[] = {
{0x75, "Status Enquiry"},
{0x7D, "Status"},
{ 0, NULL }
};
static const value_string element_type_str[] = {
/*** These are the ANSI values ***/
{0x01, "Report"},
{0x03, "Keep Alive"},
{0x07, "PVC Status"},
/*** These are the ITU values ***/
{0x51, "Report"},
{0x53, "Keep Alive"},
{0x07, "PVC Status"},
{ 0, NULL }
};
static const value_string record_type_str[] = {
{0x00, "Full Status"},
{0x01, "Link Integrity Verification Only"},
{0x02, "Single PVC"},
{ 0, NULL }
};
static const value_string pvc_status_new_str[] = {
{0x00, "PVC already present"},
{0x01, "PVC is new"},
{ 0, NULL }
};
static const value_string pvc_status_act_str[] = {
{0x00, "PVC is Inactive"},
{0x01, "PVC is Active"},
{ 0, NULL }
};
static void
dissect_lmi_report_type(tvbuff_t *tvb, int offset, proto_tree *tree)
{
proto_tree_add_uint(tree, hf_lmi_rcd_type, tvb, offset, 1, tvb_get_guint8( tvb, offset));
}
static void
dissect_lmi_link_int(tvbuff_t *tvb, int offset, proto_tree *tree)
{
proto_tree_add_uint(tree, hf_lmi_send_seq, tvb, offset, 1, tvb_get_guint8( tvb, offset));
++offset;
proto_tree_add_uint(tree, hf_lmi_recv_seq, tvb, offset, 1, tvb_get_guint8( tvb, offset));
}
static void
dissect_lmi_pvc_status(tvbuff_t *tvb, int offset, proto_tree *tree)
{
proto_tree_add_uint(tree, hf_lmi_dlci_high, tvb, offset, 1, tvb_get_guint8( tvb, offset));
++offset;
proto_tree_add_uint(tree, hf_lmi_dlci_low, tvb, offset, 1, tvb_get_guint8( tvb, offset));
++offset;
proto_tree_add_uint(tree, hf_lmi_new, tvb, offset, 1, tvb_get_guint8( tvb, offset));
proto_tree_add_uint(tree, hf_lmi_act, tvb, offset, 1, tvb_get_guint8( tvb, offset));
}
static void
dissect_lmi(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
proto_tree *lmi_tree, *lmi_subtree;
proto_item *ti;
int offset = 2, len;
guint8 ele_id;
if (check_col(pinfo->cinfo, COL_PROTOCOL))
col_set_str(pinfo->cinfo, COL_PROTOCOL, "LMI");
if (tree) {
ti = proto_tree_add_item(tree, proto_lmi, tvb, 0, 3, FALSE);
lmi_tree = proto_item_add_subtree(ti, ett_lmi_ele);
proto_tree_add_uint(lmi_tree, hf_lmi_call_ref, tvb, 0, 1, tvb_get_guint8( tvb, 0));
proto_tree_add_uint(lmi_tree, hf_lmi_msg_type, tvb, 1, 1, tvb_get_guint8( tvb, 1));
/* Display the LMI elements */
while (tvb_reported_length_remaining(tvb, offset) > 0) {
ele_id = tvb_get_guint8( tvb, offset);
len = tvb_get_guint8( tvb, offset + 1);
ti = proto_tree_add_uint(lmi_tree, hf_lmi_inf_ele, tvb, offset, len + 2,
tvb_get_guint8( tvb, offset));
lmi_subtree = proto_item_add_subtree(ti, ett_lmi_ele);
proto_tree_add_uint(lmi_subtree, hf_lmi_inf_ele, tvb, offset, 1,
tvb_get_guint8( tvb, offset));
++offset;
len = tvb_get_guint8( tvb, offset);
proto_tree_add_uint(lmi_subtree, hf_lmi_inf_len, tvb, offset, 1, len);
++offset;
if (( ele_id == 1) || (ele_id == 51))
dissect_lmi_report_type( tvb, offset, lmi_subtree);
else if (( ele_id == 3) || (ele_id == 53))
dissect_lmi_link_int( tvb, offset, lmi_subtree);
else if (( ele_id == 7) || (ele_id == 57))
dissect_lmi_pvc_status( tvb, offset, lmi_subtree);
offset += len;
}
}
else {
lmi_tree = NULL;
}
}
void
proto_register_lmi(void)
{
static hf_register_info hf[] = {
{ &hf_lmi_call_ref,
{ "Call reference", "lmi.cmd", FT_UINT8, BASE_HEX, NULL, 0,
"Call Reference", HFILL }},
{ &hf_lmi_msg_type,
{ "Message Type", "lmi.msg_type", FT_UINT8, BASE_HEX, VALS(msg_type_str), 0,
"Message Type", HFILL }},
{ &hf_lmi_inf_ele,
{ "Information Element", "lmi.inf_ele", FT_UINT8, BASE_DEC, VALS(element_type_str), 0,
"Information Element", HFILL }},
{ &hf_lmi_inf_ele,
{ "Type", "lmi.inf_ele_type", FT_UINT8, BASE_DEC, VALS(element_type_str), 0,
"Information Element Type", HFILL }},
{ &hf_lmi_inf_len,
{ "Length", "lmi.inf_ele_len", FT_UINT8, BASE_DEC, NULL, 0,
"Information Element Length", HFILL }},
{ &hf_lmi_rcd_type,
{ "Record Type", "lmi.ele_rcd_type", FT_UINT8, BASE_DEC, VALS(record_type_str), 0,
"Record Type", HFILL }},
{ &hf_lmi_send_seq,
{ "Send Seq", "lmi.send_seq", FT_UINT8, BASE_DEC, NULL, 0,
"Send Sequence", HFILL }},
{ &hf_lmi_recv_seq,
{ "Recv Seq", "lmi.recv_seq", FT_UINT8, BASE_DEC, NULL, 0,
"Receive Sequence", HFILL }},
{ &hf_lmi_dlci_high,
{ "DLCI High", "lmi.dlci_hi", FT_UINT8, BASE_DEC, NULL, 0x3f,
"DLCI High bits", HFILL }},
{ &hf_lmi_dlci_low,
{ "DLCI Low", "lmi.dlci_low", FT_UINT8, BASE_DEC, NULL, 0x78,
"DLCI Low bits", HFILL }},
{ &hf_lmi_new,
{ "DLCI New", "lmi.dlci_new", FT_UINT8, BASE_DEC, VALS(pvc_status_new_str), 0x08,
"DLCI New Flag", HFILL }},
{ &hf_lmi_act,
{ "DLCI Active","lmi.dlci_act", FT_UINT8, BASE_DEC, VALS(pvc_status_act_str), 0x02,
"DLCI Active Flag", HFILL }},
};
static gint *ett[] = {
&ett_lmi,
&ett_lmi_ele,
};
proto_lmi = proto_register_protocol ("Local Management Interface", "LMI", "lmi");
proto_register_field_array (proto_lmi, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
}
void
proto_reg_handoff_lmi(void)
{
dissector_handle_t lmi_handle;
lmi_handle = create_dissector_handle(dissect_lmi, proto_lmi);
dissector_add("fr.ietf", NLPID_LMI, lmi_handle);
}
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