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-rw-r--r--packet-lmi.c254
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diff --git a/packet-lmi.c b/packet-lmi.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 1.1 2001/03/23 19:22:02 jfoster Exp $
+ *
+ * Ethereal - Network traffic analyzer
+ * By Gerald Combs <gerald@zing.org>
+ * 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 "packet.h"
+#include "packet-osi.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;
+
+#define NLPID_LMI 0x09 /* NLPID value for LMI */
+
+#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 Acive"},
+ { 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, 0, 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->fd, COL_PROTOCOL))
+ col_set_str(pinfo->fd, 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( offset < tvb_length( tvb)){
+ 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" }},
+
+ { &hf_lmi_msg_type,
+ { "Message Type", "lmi.msg_type", FT_UINT8, BASE_HEX, VALS(msg_type_str), 0,
+ "Message Type" }},
+
+ { &hf_lmi_inf_ele,
+ { "Information Element", "lmi.inf_ele", FT_UINT8, BASE_DEC, VALS(element_type_str), 0,
+ "Information Element" }},
+ { &hf_lmi_inf_ele,
+ { "Type", "lmi.inf_ele_type", FT_UINT8, BASE_DEC, VALS(element_type_str), 0,
+ "Information Element Type" }},
+ { &hf_lmi_inf_len,
+ { "Length", "lmi.inf_ele_len", FT_UINT8, BASE_DEC, NULL, 0,
+ "Information Element Length" }},
+
+ { &hf_lmi_rcd_type,
+ { "Record Type", "lmi.ele_rcd_type", FT_UINT8, BASE_DEC, VALS(record_type_str), 0,
+ "Record Type" }},
+ { &hf_lmi_send_seq,
+ { "Send Seq", "lmi.send_seq", FT_UINT8, BASE_DEC, NULL, 0,
+ "Send Sequence" }},
+ { &hf_lmi_recv_seq,
+ { "Recv Seq", "lmi.recv_seq", FT_UINT8, BASE_DEC, NULL, 0,
+ "Receive Sequence" }},
+ { &hf_lmi_dlci_high,
+ { "DLCI High", "lmi.dlci_hi", FT_UINT8, BASE_DEC, NULL, 0x3f,
+ "DLCI High bits" }},
+ { &hf_lmi_dlci_low,
+ { "DLCI Low", "lmi.dlci_low", FT_UINT8, BASE_DEC, NULL, 0x78,
+ "DLCI Low bits" }},
+ { &hf_lmi_new,
+ { "DLCI New", "lmi.dlci_new", FT_UINT8, BASE_DEC, VALS(pvc_status_new_str), 0x08,
+ "DLCI New Flag" }},
+ { &hf_lmi_act,
+ { "DLCI Active","lmi.dlci_act", FT_UINT8, BASE_DEC, VALS(pvc_status_act_str), 0x02,
+ "DLCI Active Flag" }},
+ };
+ 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_add("fr.ietf", NLPID_LMI, dissect_lmi, proto_lmi);
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-04-19 10:22:50 +0000