2 * Routines for Frame Relay dissection
4 * Copyright 2001, Paul Ionescu <paul@acorp.ro>
6 * $Id: packet-fr.c,v 1.5 2001/01/09 09:59:28 guy Exp $
8 * Ethereal - Network traffic analyzer
9 * By Gerald Combs <gerald@zing.org>
10 * Copyright 1998 Gerald Combs
13 * This program is free software; you can redistribute it and/or
14 * modify it under the terms of the GNU General Public License
15 * as published by the Free Software Foundation; either version 2
16 * of the License, or (at your option) any later version.
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the Free Software
25 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
39 #include "packet-ip.h"
40 #include "packet-ipx.h"
41 #include "packet-arp.h"
44 static gint proto_fr = -1;
45 static gint ett_fr = -1;
46 static gint hf_fr_dlci = -1;
47 static gint hf_fr_cr = -1;
48 static gint hf_fr_becn = -1;
49 static gint hf_fr_fecn = -1;
50 static gint hf_fr_de = -1;
51 static gint hf_fr_proto = -1;
53 static dissector_handle_t ip_handle;
54 static dissector_handle_t ipx_handle;
56 static void dissect_fr(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
60 guint16 fr_header,fr_proto;
63 CHECK_DISPLAY_AS_DATA(proto_fr, tvb, pinfo, tree);
65 pinfo->current_proto = "Frame Relay";
66 if (check_col(pinfo->fd, COL_PROTOCOL))
67 col_set_str(pinfo->fd, COL_PROTOCOL, "FR");
68 if (check_col(pinfo->fd, COL_INFO))
69 col_clear(pinfo->fd, COL_INFO);
71 fr_header = tvb_get_ntohs( tvb, 0 );
72 fr_proto = tvb_get_ntohs( tvb, 2 );
73 if (check_col(pinfo->fd, COL_INFO))
74 col_add_fstr(pinfo->fd, COL_INFO, "DLCI %u, proto 0x%04x",
75 ((fr_header&0x00FF)>>4)+((fr_header&0xFC00)>>6),
80 ti = proto_tree_add_protocol_format(tree, proto_fr, tvb, 0, 4, "Frame Relay");
81 fr_tree = proto_item_add_subtree(ti, ett_fr);
83 proto_tree_add_text(fr_tree,tvb,0,2,"The real DLCI is %u",((fr_header&0x00FF)>>4)+((fr_header&0xFC00)>>6));
84 proto_tree_add_uint(fr_tree, hf_fr_dlci, tvb, 0, 2, fr_header);
85 proto_tree_add_boolean(fr_tree, hf_fr_cr, tvb, 0, 1, fr_header);
86 proto_tree_add_boolean(fr_tree, hf_fr_fecn, tvb, 1, 1, fr_header);
87 proto_tree_add_boolean(fr_tree, hf_fr_becn, tvb, 1, 1, fr_header);
88 proto_tree_add_boolean(fr_tree, hf_fr_de, tvb, 1, 1, fr_header);
89 proto_tree_add_uint(fr_tree, hf_fr_proto,tvb, 2, 2, fr_proto );
92 next_tvb = tvb_new_subset(tvb, 4, -1, -1);
96 dissect_lmi(next_tvb,pinfo,tree);
98 this is not yet implemented
101 call_dissector(ip_handle,next_tvb,pinfo,tree);
104 call_dissector(ipx_handle,next_tvb,pinfo,tree);
107 dissect_data(next_tvb,0,pinfo,tree);
113 /* Register the protocol with Ethereal */
114 void proto_register_fr(void)
116 static hf_register_info hf[] = {
118 "DLCI", "fr.dlci", FT_UINT16, BASE_DEC,
119 NULL, 0xFCF0, "Data-Link Connection Identifier" }},
121 "CR", "fr.cr", FT_BOOLEAN, 16,
122 NULL, 0x0200, "Command/Response" }},
124 "FECN", "fr.fecn", FT_BOOLEAN, 16,
125 NULL, 0x0008, "Forward Explicit Congestion Notification" }},
127 "BECN", "fr.becn", FT_BOOLEAN, 16,
128 NULL, 0x0004, "Backward Explicit Congestion Notification" }},
130 "DE", "fr.de", FT_BOOLEAN, 16,
131 NULL, 0x0002, "Discard Eligibility" }},
133 "Encapsulated Protocol", "fr.proto", FT_UINT16, BASE_HEX,
134 NULL, 0x0, "FrameRelay Encapsulated Protocol" }},
138 /* Setup protocol subtree array */
139 static gint *ett[] = {
143 proto_fr = proto_register_protocol("Frame Relay", "FR", "fr");
144 proto_register_field_array(proto_fr, hf, array_length(hf));
145 proto_register_subtree_array(ett, array_length(ett));
147 register_dissector("fr", dissect_fr, proto_fr);
150 void proto_reg_handoff_fr(void)
153 * Get handles for the IP and IPX dissectors.
155 ip_handle = find_dissector("ip");
156 ipx_handle = find_dissector("ipx");
158 dissector_add("wtap_encap", WTAP_ENCAP_FRELAY, dissect_fr, proto_fr);