2 * Routines for ldp packet disassembly
4 * $Id: packet-ldp.c,v 1.9 2000/12/04 06:05:49 guy Exp $
6 * Copyright (c) November 2000 by Richard Sharpe <rsharpe@ns.aus.com>
8 * Ethereal - Network traffic analyzer
10 * Copyright 1999 Gerald Combs
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License
13 * as published by the Free Software Foundation; either version 2
14 * of the License, or (at your option) any later version.
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
30 #ifdef HAVE_SYS_TYPES_H
31 # include <sys/types.h>
34 #ifdef HAVE_NETINET_IN_H
35 #include <netinet/in.h>
48 #define TCP_PORT_LDP 646
49 #define UDP_PORT_LDP 646
51 void proto_reg_handoff_ldp(void);
53 static int proto_ldp = -1;
55 /* Delete the following if you do not use it, or add to it if you need */
56 static int hf_ldp_req = -1;
57 static int hf_ldp_rsp = -1;
58 static int hf_ldp_version = -1;
59 static int hf_ldp_pdu_len = -1;
60 static int hf_ldp_lsr = -1;
61 static int hf_ldp_ls_id = -1;
62 static int hf_ldp_msg_type = -1;
63 static int hf_ldp_msg_len = -1;
64 static int hf_ldp_msg_id = -1;
65 static int hf_ldp_tlv_value = -1;
66 static int hf_ldp_tlv_type = -1;
67 static int hf_ldp_tlv_len = -1;
68 static int hf_ldp_tlv_val_hold = -1;
69 static int hf_ldp_tlv_val_target = -1;
70 static int hf_ldp_tlv_val_request = -1;
71 static int hf_ldp_tlv_val_res = -1;
72 static int hf_ldp_tlv_config_seqno = -1;
73 static int hf_ldp_tlv_fec_wc = -1;
74 static int hf_ldp_tlv_fec_af = -1;
75 static int hf_ldp_tlv_fec_len = -1;
76 static int hf_ldp_tlv_fec_pfval = -1;
78 static int ett_ldp = -1;
79 static int ett_ldp_header = -1;
80 static int ett_ldp_ldpid = -1;
81 static int ett_ldp_message = -1;
82 static int ett_ldp_tlv = -1;
83 static int ett_ldp_tlv_val = -1;
84 static int ett_ldp_fec = -1;
86 static int tcp_port = 0;
87 static int udp_port = 0;
89 /* Add your functions here */
91 static int global_ldp_tcp_port = TCP_PORT_LDP;
92 static int global_ldp_udp_port = UDP_PORT_LDP;
95 * The following define all the TLV types I know about
98 #define TLV_FEC 0x0100
99 #define TLV_ADDRESS_LIST 0x0101
100 #define TLV_HOP_COUNT 0x0103
101 #define TLV_PATH_VECTOR 0x0104
102 #define TLV_GENERIC_LABEL 0x0200
103 #define TLV_ATM_LABEL 0x0201
104 #define TLV_FRAME_LABEL 0x0202
105 #define TLV_STATUS 0x0300
106 #define TLV_EXTENDED_STATUS 0x0301
107 #define TLV_RETURNED_PDU 0x0302
108 #define TLV_RETURNED_MESSAGE 0x0303
109 #define TLV_COMMON_HELLO_PARMS 0x0400
110 #define TLV_IPV4_TRANSPORT_ADDRESS 0x0401
111 #define TLV_CONFIGURATION_SEQNO 0x0402
112 #define TLV_IPV6_TRANSPORT_ADDRESS 0x0403
113 #define TLV_COMMON_SESSION_PARMS 0x0500
114 #define TLV_ATM_SESSION_PARMS 0x0501
115 #define TLV_FRAME_RELAY_SESSION_PARMS 0x0502
116 #define TLV_LABEL_REQUEST_MESSAGE_ID 0x0600
118 #define TLV_VENDOR_PRIVATE_START 0x3E00
119 #define TLV_VENDOR_PROVATE_END 0x3EFF
120 #define TLV_EXPERIMENTAL_START 0x3F00
121 #define TLV_EXPERIMENTAL_END 0x3FFF
123 static const value_string tlv_type_names[] = {
124 { TLV_FEC, "Forwarding Equivalence Classes" },
125 { TLV_ADDRESS_LIST, "Address List"},
126 { TLV_HOP_COUNT, "Hop Count"},
127 { TLV_PATH_VECTOR, "Path Vector"},
128 { TLV_GENERIC_LABEL, "Generic Label"},
129 { TLV_ATM_LABEL, "Frame Label"},
130 { TLV_STATUS, "Status"},
131 { TLV_EXTENDED_STATUS, "Extended Status"},
132 { TLV_RETURNED_PDU, "Returned PDU"},
133 { TLV_RETURNED_MESSAGE, "Returned Message"},
134 { TLV_COMMON_HELLO_PARMS, "Common Hello Parameters"},
135 { TLV_IPV4_TRANSPORT_ADDRESS, "IPv4 Transport Address"},
136 { TLV_CONFIGURATION_SEQNO, "Configuration Sequence Number"},
137 { TLV_IPV6_TRANSPORT_ADDRESS, "IPv6 Transport Address"},
138 { TLV_COMMON_SESSION_PARMS, "Common Session Parameters"},
139 { TLV_ATM_SESSION_PARMS, "ATM Session Parameters"},
140 { TLV_FRAME_RELAY_SESSION_PARMS, "Frame Relay Session Parameters"},
141 { TLV_LABEL_REQUEST_MESSAGE_ID, "Label Request Message ID"},
146 * The following define all the message types I know about
149 #define LDP_NOTIFICATION 0x0001
150 #define LDP_HELLO 0x0100
151 #define LDP_INITIALIZATION 0x0200
152 #define LDP_KEEPALIVE 0x0201
153 #define LDP_ADDRESS 0x0300
154 #define LDP_ADDRESS_WITHDRAWAL 0x0301
155 #define LDP_LABEL_MAPPING 0x0400
156 #define LDP_LABEL_REQUEST 0x0401
157 #define LDP_LABEL_WITHDRAWAL 0x0402
158 #define LDP_LABEL_RELEASE 0x0403
159 #define LDP_LABEL_ABORT_REQUEST 0x0404
160 #define LDP_VENDOR_PRIVATE_START 0x3E00
161 #define LDP_VENDOR_PRIVATE_END 0x3EFF
162 #define LDP_EXPERIMENTAL_MESSAGE_START 0x3F00
163 #define LDP_EXPERIMENTAL_MESSAGE_END 0x3FFF
165 static const value_string ldp_message_types[] = {
166 {LDP_NOTIFICATION, "Notification"},
167 {LDP_HELLO, "Hello"},
168 {LDP_INITIALIZATION, "Initialization"},
169 {LDP_KEEPALIVE, "Keep Alive"},
170 {LDP_ADDRESS, "Address"},
171 {LDP_ADDRESS_WITHDRAWAL, "Address Withdrawal"},
172 {LDP_LABEL_MAPPING, "Label Mapping"},
173 {LDP_LABEL_REQUEST, "Label Request"},
174 {LDP_LABEL_WITHDRAWAL, "Label Withdrawal"},
175 {LDP_LABEL_RELEASE, "Label Release"},
176 {LDP_LABEL_ABORT_REQUEST, "Label Abort Request"},
180 static const true_false_string hello_targeted_vals = {
185 static const value_string fec_types[] = {
188 {3, "Host Address FEC"},
192 static const value_string fec_af_types[] = {
194 {2, "Internet (IPv4)"},
202 static const true_false_string hello_requested_vals = {
203 "Source requests periodic hellos",
204 "Source does not request periodic hellos"
207 /* Dissect the common hello params */
209 void dissect_tlv_common_hello_parms(tvbuff_t *tvb, guint offset, proto_tree *tree, int rem)
211 proto_tree *ti = NULL, *val_tree = NULL;
215 ti = proto_tree_add_bytes(tree, hf_ldp_tlv_value, tvb, offset, rem,
216 tvb_get_ptr(tvb, offset, rem));
218 val_tree = proto_item_add_subtree(ti, ett_ldp_tlv_val);
220 proto_tree_add_item(val_tree, hf_ldp_tlv_val_hold, tvb, offset, 2, FALSE);
222 proto_tree_add_boolean(val_tree, hf_ldp_tlv_val_target, tvb, offset + 2, 2, FALSE);
223 proto_tree_add_boolean(val_tree, hf_ldp_tlv_val_request, tvb, offset + 2, 2, FALSE);
224 proto_tree_add_item(val_tree, hf_ldp_tlv_val_res, tvb, offset + 2, 2, FALSE);
229 /* Dissect a TLV and return the number of bytes consumed ... */
231 int dissect_tlv(tvbuff_t *tvb, guint offset, proto_tree *tree, int rem)
233 guint16 message = tvb_get_ntohs(tvb, offset),
234 length = tvb_get_ntohs(tvb, offset + 2),
235 pad = 0, fec_len = 0;
236 proto_tree *ti = NULL, *tlv_tree = NULL;
238 /* Hmmm, check for illegal alignment padding */
240 if (message == 0x00) {
242 proto_tree_add_text(tree, tvb, offset, 2, "Illegal Padding: %04X", message);
243 offset += 2; pad = 2;
244 message = tvb_get_ntohs(tvb, offset);
245 length = tvb_get_ntohs(tvb, offset + 2);
249 length = MIN(length, rem); /* Don't go haywire if a problem ... */
253 /* FIXME: Account for vendor and special messages */
255 ti = proto_tree_add_text(tree, tvb, offset, length + 4, "%s",
256 val_to_str(message, tlv_type_names, "Unknown TLV type (0x%04X)"));
258 tlv_tree = proto_item_add_subtree(ti, ett_ldp_tlv);
260 proto_tree_add_item(tlv_tree, hf_ldp_tlv_type, tvb, offset, 2, FALSE);
262 proto_tree_add_item(tlv_tree, hf_ldp_tlv_len, tvb, offset + 2, 2, FALSE);
266 case TLV_FEC: /* Process an FEC */
268 offset += 4; /* Skip the TLV header */
272 while (fec_len > 0) {
273 proto_tree *fec_tree = NULL;
276 switch (tvb_get_guint8(tvb, offset)) {
277 case 1: /* Wild Card */
279 proto_tree_add_item(tlv_tree, hf_ldp_tlv_fec_wc, tvb, offset, 4, FALSE);
288 /* Add a subtree for this ... */
290 ti = proto_tree_add_text(tlv_tree, tvb, offset, 8, "Prefix FEC Element");
292 fec_tree = proto_item_add_subtree(ti, ett_ldp_fec);
294 proto_tree_add_item(fec_tree, hf_ldp_tlv_fec_wc, tvb, offset, 1, FALSE);
298 /* XXX - the address family length should be extracted and used to
299 dissect the prefix field. */
300 proto_tree_add_item(fec_tree, hf_ldp_tlv_fec_af, tvb, offset, 2, FALSE);
304 proto_tree_add_item(fec_tree, hf_ldp_tlv_fec_len, tvb, offset, 1, FALSE);
308 proto_tree_add_item(fec_tree, hf_ldp_tlv_fec_pfval, tvb, offset, 4, FALSE);
314 case 3: /* Host address */
316 /* XXX - write me. */
324 default: /* Unknown */
326 /* XXX - do all FEC's have a length that's a multiple of 4? */
340 case TLV_COMMON_HELLO_PARMS:
342 dissect_tlv_common_hello_parms(tvb, offset + 4, tlv_tree, length);
345 case TLV_CONFIGURATION_SEQNO:
347 proto_tree_add_item(tlv_tree, hf_ldp_tlv_config_seqno, tvb, offset + 4, 4, FALSE);
351 proto_tree_add_bytes(tlv_tree, hf_ldp_tlv_value, tvb, offset + 4,
352 length, tvb_get_ptr(tvb, offset + 4, length));
359 return length + pad + 4; /* Length of the value field + header */
364 * Each of these routines dissect the relevant messages, but the msg header
365 * has already been dissected.
369 dissect_ldp_notification(tvbuff_t *tvb, guint offset, packet_info *pinfo, proto_tree *tree, guint length)
371 guint rem = length, cc = 0;
375 rem -= (cc = dissect_tlv(tvb, offset, tree, rem));
382 /* Dissect a Hello Message ... */
384 dissect_ldp_hello(tvbuff_t *tvb, guint offset, packet_info *pinfo, proto_tree *tree, guint length)
386 guint rem = length, cc = 0;
390 rem -= (cc = dissect_tlv(tvb, offset, tree, rem));
398 dissect_ldp_initialization(tvbuff_t *tvb, guint offset, packet_info *pinfo, proto_tree *tree, guint length)
400 guint rem = length, cc = 0;
404 rem -= (cc = dissect_tlv(tvb, offset, tree, rem));
412 dissect_ldp_keepalive(tvbuff_t *tvb, guint offset, packet_info *pinfo, proto_tree *tree, guint length)
414 guint rem = length, cc = 0;
418 rem -= (cc = dissect_tlv(tvb, offset, tree, rem));
426 dissect_ldp_address(tvbuff_t *tvb, guint offset, packet_info *pinfo, proto_tree *tree, guint length)
428 guint rem = length, cc = 0;
432 rem -= (cc = dissect_tlv(tvb, offset, tree, rem));
440 dissect_ldp_address_withdrawal(tvbuff_t *tvb, guint offset, packet_info *pinfo, proto_tree *tree, guint length)
442 guint rem = length, cc = 0;
446 rem -= (cc = dissect_tlv(tvb, offset, tree, rem));
454 dissect_ldp_label_mapping(tvbuff_t *tvb, guint offset, packet_info *pinfo, proto_tree *tree, guint length)
456 guint rem = length, cc = 0;
460 rem -= (cc = dissect_tlv(tvb, offset, tree, rem));
468 dissect_ldp_label_request(tvbuff_t *tvb, guint offset, packet_info *pinfo, proto_tree *tree, guint length)
470 guint rem = length, cc = 0;
474 rem -= (cc = dissect_tlv(tvb, offset, tree, rem));
482 dissect_ldp_label_withdrawal(tvbuff_t *tvb, guint offset, packet_info *pinfo, proto_tree *tree, guint length)
484 guint rem = length, cc = 0;
488 rem -= (cc = dissect_tlv(tvb, offset, tree, rem));
496 dissect_ldp_label_release(tvbuff_t *tvb, guint offset, packet_info *pinfo, proto_tree *tree, guint length)
498 guint rem = length, cc = 0;
502 rem -= (cc = dissect_tlv(tvb, offset, tree, rem));
510 dissect_ldp_label_abort_request(tvbuff_t *tvb, guint offset, packet_info *pinfo, proto_tree *tree, guint length)
512 guint rem = length, cc = 0;
516 rem -= (cc = dissect_tlv(tvb, offset, tree, rem));
524 dissect_ldp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
526 proto_tree *ldp_tree = NULL,
528 *hdr_tree = NULL, *ldpid_tree = NULL;
529 int offset = 0, msg_cnt = 0;
530 guint16 ldp_message = 0;
532 CHECK_DISPLAY_AS_DATA(proto_ldp, tvb, pinfo, tree);
534 pinfo->current_proto = "LDP";
536 if (check_col(pinfo->fd, COL_PROTOCOL))
538 col_add_str(pinfo->fd, COL_PROTOCOL, "LDP");
540 if (tree) { /* Build the tree info ..., this is wrong! FIXME */
542 ti = proto_tree_add_item(tree, proto_ldp, tvb, offset,
543 tvb_length_remaining(tvb, offset), FALSE);
544 ldp_tree = proto_item_add_subtree(ti, ett_ldp);
546 ti = proto_tree_add_text(ldp_tree, tvb, 0, 10, "Header");
548 hdr_tree = proto_item_add_subtree(ti, ett_ldp_header);
550 proto_tree_add_item(hdr_tree, hf_ldp_version, tvb, offset, 2, FALSE);
554 proto_tree_add_item(hdr_tree, hf_ldp_pdu_len, tvb, offset, 2, FALSE);
558 ti = proto_tree_add_text(hdr_tree, tvb, offset, 6, "LDP Identifier");
560 ldpid_tree = proto_item_add_subtree(ti, ett_ldp_ldpid);
562 proto_tree_add_item(ldpid_tree, hf_ldp_lsr, tvb, offset, 4, FALSE);
566 proto_tree_add_item(ldpid_tree, hf_ldp_ls_id, tvb, offset, 2, FALSE);
574 while (tvb_length_remaining(tvb, offset) > 0) { /* Dissect a message */
578 ldp_message = tvb_get_ntohs(tvb, offset) & 0x7FFF; /* Get the message type */
580 msg_len = tvb_get_ntohs(tvb, offset + 2);
582 if (check_col(pinfo->fd, COL_INFO)) { /* Check the type ... */
585 col_append_fstr(pinfo->fd, COL_INFO, ", %s",
586 val_to_str(ldp_message, ldp_message_types, "Unknown Message (0x%04X)"));
588 col_add_fstr(pinfo->fd, COL_INFO, "%s",
589 val_to_str(ldp_message, ldp_message_types, "Unknown Message (0x%04X)"));
597 proto_tree *ti = NULL, *msg_tree = NULL;
599 /* FIXME: Account for vendor and experimental messages */
601 ti = proto_tree_add_text(ldp_tree, tvb, offset, msg_len + 4, "%s",
602 val_to_str(ldp_message, ldp_message_types, "Unknown Message (0x%04X)"));
604 msg_tree = proto_item_add_subtree(ti, ett_ldp_message);
606 proto_tree_add_item(msg_tree, hf_ldp_msg_type, tvb, offset, 2, FALSE);
608 proto_tree_add_item(msg_tree, hf_ldp_msg_len, tvb, offset + 2, 2, FALSE);
610 proto_tree_add_item(msg_tree, hf_ldp_msg_id, tvb, offset + 4, 4, FALSE);
612 switch (ldp_message) {
614 case LDP_NOTIFICATION:
616 dissect_ldp_notification(tvb, offset + 8, pinfo, msg_tree, msg_len - 4);
622 dissect_ldp_hello(tvb, offset + 8, pinfo, msg_tree, msg_len - 4);
626 case LDP_INITIALIZATION:
628 dissect_ldp_initialization(tvb, offset + 8, pinfo, msg_tree, msg_len - 4);
634 dissect_ldp_keepalive(tvb, offset + 8, pinfo, msg_tree, msg_len - 4);
640 dissect_ldp_address(tvb, offset + 8, pinfo, msg_tree, msg_len - 4);
644 case LDP_ADDRESS_WITHDRAWAL:
646 dissect_ldp_address_withdrawal(tvb, offset + 8, pinfo, msg_tree, msg_len - 4);
650 case LDP_LABEL_MAPPING:
652 dissect_ldp_label_mapping(tvb, offset + 8, pinfo, msg_tree, msg_len - 4);
656 case LDP_LABEL_REQUEST:
658 dissect_ldp_label_request(tvb, offset + 8, pinfo, msg_tree, msg_len - 4);
662 case LDP_LABEL_WITHDRAWAL:
664 dissect_ldp_label_withdrawal(tvb, offset + 8, pinfo, msg_tree, msg_len - 4);
668 case LDP_LABEL_RELEASE:
670 dissect_ldp_label_release(tvb, offset + 8, pinfo, msg_tree, msg_len - 4);
674 case LDP_LABEL_ABORT_REQUEST:
676 dissect_ldp_label_abort_request(tvb, offset + 8, pinfo, msg_tree, msg_len - 4);
682 /* Some sort of unknown message, treat as undissected data */
690 offset += msg_len + 4;
695 /* Register all the bits needed with the filtering engine */
698 proto_register_ldp(void)
700 static hf_register_info hf[] = {
702 /* Change the following to the type you need */
703 { "Request", "ldp.req", FT_BOOLEAN, BASE_NONE, NULL, 0x0, "" }},
706 { "Response", "ldp.rsp", FT_BOOLEAN, BASE_NONE, NULL, 0x0, "" }},
709 { "Version", "ldp.hdr.version", FT_UINT16, BASE_DEC, NULL, 0x0, "LDP Version Number" }},
712 { "PDU Length", "ldp.hdr.pdu_len", FT_UINT16, BASE_DEC, NULL, 0x0, "LDP PDU Length"}},
715 { "LSR ID", "ldp.hdr.ldpid.lsr", FT_UINT32, BASE_HEX, NULL, 0x0, "LDP Label Space Router ID"}},
718 { "Label Space ID", "ldp.hdr.ldpid.lsid", FT_UINT16, BASE_HEX, NULL, 0x0, "LDP Label Space ID"}},
721 { "Message Type", "ldp.msg.type", FT_UINT16, BASE_HEX, VALS(ldp_message_types), 0x0, "LDP message type"}},
724 { "Message Length", "ldp.msg.len", FT_UINT16, BASE_DEC, NULL, 0x0, "LDP Message Length (excluding message type and len)"}},
727 { "Message ID", "ldp.msg.id", FT_UINT32, BASE_HEX, NULL, 0x0, "LDP Message ID"}},
730 { "TLV Type", "ldp.msg.tlv.type", FT_UINT16, BASE_HEX, VALS(tlv_type_names), 0x0, "TLV Type Field"}},
733 {"TLV Length", "ldp.msg.tlv.len", FT_UINT16, BASE_DEC, NULL, 0x0, "TLV Length Field"}},
736 { "TLV Value", "ldp.msg.tlv.value", FT_BYTES, BASE_NONE, NULL, 0x0, "TLV Value Bytes"}},
738 { &hf_ldp_tlv_val_hold,
739 { "Hold Time", "ldp.msg.tlv.hello.hold", FT_UINT16, BASE_DEC, NULL, 0x0, "Hello Common Parameters Hold Time"}},
741 { &hf_ldp_tlv_val_target,
742 { "Targeted Hello", "ldp.msg.tlv.hello.targeted", FT_BOOLEAN, 8, TFS(&hello_targeted_vals), 0x80, "Hello Common Parameters Targeted Bit"}},
744 { &hf_ldp_tlv_val_request,
745 { "Hello Requested", "ldp,msg.tlv.hello.requested", FT_BOOLEAN, 8, TFS(&hello_requested_vals), 0x40, "Hello Common Parameters Hello Requested Bit" }},
747 { &hf_ldp_tlv_val_res,
748 { "Reserved", "ldp.msg.tlv.hello.res", FT_UINT16, BASE_HEX, NULL, 0x3FFF, "Hello Common Parameters Reserved Field"}},
750 { &hf_ldp_tlv_config_seqno,
751 { "Configuration Sequence Number", "ldp.msg.tlv.hello.cnf_seqno", FT_UINT32, BASE_HEX, NULL, 0x0, "Hello COnfiguration Sequence Number"}},
753 { &hf_ldp_tlv_fec_wc,
754 { "FEC Element Type", "ldp.msg.tlv.fec.type", FT_UINT8, BASE_DEC, VALS(fec_types), 0x0, "Forwarding Equivalence Class Element Types"}},
756 { &hf_ldp_tlv_fec_af,
757 { "FEC Element Address Type", "ldp.msg.tlv.fec.af", FT_UINT16, BASE_DEC, VALS(fec_af_types), 0x0, "Forwarding Equivalence Class Element Address Family"}},
759 { &hf_ldp_tlv_fec_len,
760 { "FEC Element Length", "ldp.msg.tlv.fec.len", FT_UINT8, BASE_DEC, NULL, 0x0, "Forwarding Equivalence Class Element Length"}},
762 { &hf_ldp_tlv_fec_pfval,
763 { "FEC Element Prefix Value", "ldp.msg.tlv.fec.pfval", FT_UINT32, BASE_HEX, NULL, 0x0, "Forwarding Equivalence Class Element Prefix"}},
766 static gint *ett[] = {
775 module_t *ldp_module;
777 /* Register our configuration options for , particularly our port */
779 ldp_module = prefs_register_module("ldp", "LDP", proto_reg_handoff_ldp);
781 prefs_register_uint_preference(ldp_module, "tcp.port", "LDP TCP Port",
782 "Set the port for messages (if other"
783 " than the default of 646)",
784 10, &global_ldp_tcp_port);
786 prefs_register_uint_preference(ldp_module, "udp.port", "LDP UDP Port",
787 "Set the port for messages (if other"
788 " than the default of 646)",
789 10, &global_ldp_udp_port);
791 proto_ldp = proto_register_protocol("Label Distribution Protocol",
794 proto_register_field_array(proto_ldp, hf, array_length(hf));
795 proto_register_subtree_array(ett, array_length(ett));
799 /* The registration hand-off routine */
801 proto_reg_handoff_ldp(void)
803 static int ldp_prefs_initialized = FALSE;
805 if (ldp_prefs_initialized) {
807 dissector_delete("tcp.port", tcp_port, dissect_ldp);
808 dissector_delete("udp.port", udp_port, dissect_ldp);
813 ldp_prefs_initialized = TRUE;
817 /* Set our port number for future use */
819 tcp_port = global_ldp_tcp_port;
820 udp_port = global_ldp_udp_port;
822 dissector_add("tcp.port", global_ldp_tcp_port, dissect_ldp);
823 dissector_add("udp.port", global_ldp_udp_port, dissect_ldp);