forked from osmocom/wireshark
359 lines
11 KiB
C
359 lines
11 KiB
C
/* packet-bat-batman.c
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* Routines for B.A.T.M.A.N. Layer 3 dissection
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* Copyright 2008, Sven Eckelmann <sven.eckelmann@gmx.de>
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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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#include "packet-bat.h"
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#include <epan/addr_resolv.h>
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static gint ett_bat_batman = -1;
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static gint ett_bat_batman_flags = -1;
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static gint ett_bat_batman_gwflags = -1;
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static gint ett_bat_batman_hna = -1;
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static dissector_handle_t data_handle;
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static int hf_bat_batman_version = -1;
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static int hf_bat_batman_flags = -1;
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static int hf_bat_batman_ttl = -1;
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static int hf_bat_batman_gwflags = -1;
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static int hf_bat_batman_seqno = -1;
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static int hf_bat_batman_gwport = -1;
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static int hf_bat_batman_orig = -1;
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static int hf_bat_batman_old_orig = -1;
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static int hf_bat_batman_tq = -1;
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static int hf_bat_batman_hna_len = -1;
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static int hf_bat_batman_hna_network = -1;
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static int hf_bat_batman_hna_netmask = -1;
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/* flags */
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static int hf_bat_batman_flags_unidirectional = -1;
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static int hf_bat_batman_flags_directlink = -1;
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/* gwflags */
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/* unknown */
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static guint global_bat_batman_udp_port = BAT_BATMAN_PORT;
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static guint udp_port = 0;
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static void dissect_bat_batman(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree);
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static void dissect_bat_hna(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree);
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/* supported packet dissectors */
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static void dissect_bat_batman_v5(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree);
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void register_bat_batman(void)
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{
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static hf_register_info hf[] = {
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{ &hf_bat_batman_version,
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{ "Version", "bat.batman.version",
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FT_UINT8, BASE_DEC, NULL, 0x0,
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"", HFILL }
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},
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{ &hf_bat_batman_flags,
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{ "Flags", "bat.batman.flags",
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FT_UINT8, BASE_HEX, NULL, 0x0,
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"", HFILL }
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},
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{ &hf_bat_batman_ttl,
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{ "Time to Live", "bat.batman.ttl",
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FT_UINT8, BASE_DEC, NULL, 0x0,
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"", HFILL }
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},
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{ &hf_bat_batman_gwflags,
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{ "Gateway Flags", "bat.batman.gwflags",
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FT_UINT8, BASE_HEX, NULL, 0x0,
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"", HFILL }
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},
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{ &hf_bat_batman_seqno,
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{ "Sequence number", "bat.batman.seq",
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FT_UINT16, BASE_DEC, NULL, 0x0,
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"", HFILL }
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},
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{ &hf_bat_batman_gwport,
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{ "Gateway Port", "bat.batman.gwport",
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FT_UINT16, BASE_DEC, NULL, 0x0,
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"", HFILL }
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},
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{ &hf_bat_batman_orig,
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{ "Originator", "bat.batman.orig",
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FT_IPv4, BASE_NONE, NULL, 0x0,
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"", HFILL }
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},
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{ &hf_bat_batman_old_orig,
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{ "Received from", "bat.batman.old_orig",
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FT_IPv4, BASE_NONE, NULL, 0x0,
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"", HFILL }
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},
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{ &hf_bat_batman_tq,
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{ "Transmission Quality", "bat.batman.tq",
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FT_UINT8, BASE_DEC, NULL, 0x0,
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"", HFILL }
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},
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{ &hf_bat_batman_hna_len,
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{ "Number of HNAs", "bat.batman.hna_len",
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FT_UINT8, BASE_DEC, NULL, 0x0,
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"", HFILL }
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},
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{ &hf_bat_batman_flags_unidirectional,
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{ "Unidirectional", "bat.batman.flags.unidirectional",
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FT_BOOLEAN, 8, TFS(&flags_set_truth), 0x80,
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"", HFILL }
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},
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{ &hf_bat_batman_flags_directlink,
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{ "DirectLink", "bat.batman.flags.directlink",
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FT_BOOLEAN, 8, TFS(&flags_set_truth), 0x40,
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"", HFILL }
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},
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{ &hf_bat_batman_hna_network,
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{ "HNA Network", "bat.batman.hna_network",
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FT_IPv4, BASE_NONE, NULL, 0x0,
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"", HFILL }
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},
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{ &hf_bat_batman_hna_netmask,
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{ "HNA Netmask", "bat.batman.hna_netmask",
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FT_UINT8, BASE_DEC, NULL, 0x0,
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"", HFILL }
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}
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};
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/* Setup protocol subtree array */
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static gint *ett[] = {
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&ett_bat_batman,
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&ett_bat_batman_flags,
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&ett_bat_batman_gwflags,
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&ett_bat_batman_hna
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};
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proto_register_field_array(proto_bat_plugin, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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prefs_register_uint_preference(bat_module, "batman.bat.port", "BAT UDP Port",
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"Set the port for B.A.T.M.A.N. BAT "
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"messages (if other than the default of 4305)",
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10, &global_bat_batman_udp_port);
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}
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void reg_handoff_bat_batman(void)
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{
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static gboolean inited = FALSE;
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static dissector_handle_t batman_handle;
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if (!inited) {
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batman_handle = create_dissector_handle(dissect_bat_batman, proto_bat_plugin);
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data_handle = find_dissector("data");
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inited = TRUE;
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} else {
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dissector_delete("udp.port", udp_port, batman_handle);
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}
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udp_port = global_bat_batman_udp_port;
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dissector_add("udp.port", udp_port, batman_handle);
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}
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static void dissect_bat_batman(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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guint8 version;
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/* set protocol name */
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if (check_col(pinfo->cinfo, COL_PROTOCOL)) {
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "BAT_BATMAN");
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}
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version = tvb_get_guint8(tvb, 0);
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switch (version) {
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case 5:
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dissect_bat_batman_v5(tvb, pinfo, tree);
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break;
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default:
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if (check_col(pinfo->cinfo, COL_INFO)) {
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col_clear(pinfo->cinfo, COL_INFO);
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col_append_fstr(pinfo->cinfo, COL_INFO, "Unsupported Version %d", version);
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}
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call_dissector(data_handle, tvb, pinfo, tree);
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break;
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}
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}
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static void dissect_bat_gwflags(tvbuff_t *tvb, guint8 gwflags, int offset, proto_item *tgw)
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{
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proto_tree *gwflags_tree;
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guint8 s = (gwflags & 0x80) >> 7;
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guint8 downbits = (gwflags & 0x7C) >> 3;
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guint8 upbits = (gwflags & 0x07);
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guint down, up;
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down = 32 * (s + 2) * (1 << downbits);
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up = ((upbits + 1) * down) / 8;
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gwflags_tree = proto_item_add_subtree(tgw, ett_bat_batman_gwflags);
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proto_tree_add_text(gwflags_tree, tvb, offset, 1, "Download Speed: %dkbit", down);
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proto_tree_add_text(gwflags_tree, tvb, offset, 1, "Upload Speed: %dkbit", up);
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}
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static void dissect_bat_batman_v5(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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struct batman_packet_v5 *batman_packeth;
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const guint8 *old_orig_addr, *orig_addr;
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guint32 old_orig, orig;
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gint i;
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tvbuff_t *next_tvb;
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guint length_remaining;
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int offset = 0;
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batman_packeth = ep_alloc(sizeof(struct batman_packet_v5));
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batman_packeth->version = tvb_get_guint8(tvb, 0);
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batman_packeth->flags = tvb_get_guint8(tvb, 1);
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batman_packeth->ttl = tvb_get_guint8(tvb, 2);
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batman_packeth->gwflags = tvb_get_guint8(tvb, 3);
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batman_packeth->seqno = tvb_get_ntohs(tvb, 4);
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batman_packeth->gwport = tvb_get_ntohs(tvb, 6);
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orig_addr = tvb_get_ptr(tvb, 8, 4);
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orig = tvb_get_ipv4(tvb, 8);
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SET_ADDRESS(&batman_packeth->orig, AT_IPv4, 4, orig_addr);
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old_orig_addr = tvb_get_ptr(tvb, 12, 4);
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old_orig = tvb_get_ipv4(tvb, 12);
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SET_ADDRESS(&batman_packeth->old_orig, AT_IPv4, 4, old_orig_addr);
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batman_packeth->tq = tvb_get_guint8(tvb, 16);
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batman_packeth->hna_len = tvb_get_guint8(tvb, 17);
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/* Set info column */
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if (check_col(pinfo->cinfo, COL_INFO)) {
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col_clear(pinfo->cinfo, COL_INFO);
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col_append_fstr(pinfo->cinfo, COL_INFO, "Seq=%u",
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batman_packeth->seqno);
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}
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/* Set tree info */
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if (tree) {
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proto_item *ti = NULL, *tf, *tgw;
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proto_tree *bat_batman_tree = NULL, *flag_tree = NULL;
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if (PTREE_DATA(tree)->visible) {
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ti = proto_tree_add_protocol_format(tree, proto_bat_plugin, tvb, 0, BATMAN_PACKET_V5_SIZE,
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"B.A.T.M.A.N., Orig: %s (%s)",
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get_hostname(orig), ip_to_str(batman_packeth->orig.data));
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} else {
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ti = proto_tree_add_item(tree, proto_bat_plugin, tvb, 0, BATMAN_PACKET_V5_SIZE, FALSE);
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}
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bat_batman_tree = proto_item_add_subtree(ti, ett_bat_batman);
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/* items */
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proto_tree_add_item(bat_batman_tree, hf_bat_batman_version, tvb, offset, 1, FALSE);
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offset += 1;
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tf = proto_tree_add_item(bat_batman_tree, hf_bat_batman_flags, tvb, offset, 1, FALSE);
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/* <flags> */
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flag_tree = proto_item_add_subtree(tf, ett_bat_batman_flags);
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proto_tree_add_boolean(flag_tree, hf_bat_batman_flags_unidirectional, tvb, offset, 1, batman_packeth->flags);
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proto_tree_add_boolean(flag_tree, hf_bat_batman_flags_directlink, tvb, offset, 1, batman_packeth->flags);
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/* </flags> */
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offset += 1;
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proto_tree_add_item(bat_batman_tree, hf_bat_batman_ttl, tvb, offset, 1, FALSE);
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offset += 1;
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tgw = proto_tree_add_item(bat_batman_tree, hf_bat_batman_gwflags, tvb, offset, 1, FALSE);
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dissect_bat_gwflags(tvb, batman_packeth->gwflags, offset, tgw);
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offset += 1;
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proto_tree_add_item(bat_batman_tree, hf_bat_batman_seqno, tvb, offset, 2, FALSE);
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offset += 2;
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proto_tree_add_item(bat_batman_tree, hf_bat_batman_gwport, tvb, offset, 2, FALSE);
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offset += 2;
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proto_tree_add_ipv4(bat_batman_tree, hf_bat_batman_orig, tvb, offset, 4, orig);
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offset += 4;
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proto_tree_add_ipv4(bat_batman_tree, hf_bat_batman_old_orig, tvb, offset, 4, old_orig);
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offset += 4;
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proto_tree_add_item(bat_batman_tree, hf_bat_batman_tq, tvb, offset, 1, FALSE);
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offset += 1;
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proto_tree_add_item(bat_batman_tree, hf_bat_batman_hna_len, tvb, offset, 1, FALSE);
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offset += 1;
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}
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tap_queue_packet(bat_tap, pinfo, batman_packeth);
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length_remaining = tvb_length_remaining(tvb, offset);
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for (i = 0; i < batman_packeth->hna_len; i++) {
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next_tvb = tvb_new_subset(tvb, offset, 5, 5);
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if (have_tap_listener(bat_follow_tap)) {
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tap_queue_packet(bat_follow_tap, pinfo, next_tvb);
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}
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dissect_bat_hna(next_tvb, pinfo, tree);
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offset += 5;
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}
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length_remaining = tvb_length_remaining(tvb, offset);
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if (length_remaining != 0) {
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next_tvb = tvb_new_subset(tvb, offset, length_remaining, length_remaining);
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if (have_tap_listener(bat_follow_tap)) {
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tap_queue_packet(bat_follow_tap, pinfo, next_tvb);
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}
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call_dissector(data_handle, next_tvb, pinfo, tree);
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}
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}
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static void dissect_bat_hna(tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *tree)
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{
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const guint8 *hna_addr;
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guint32 hna;
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guint8 hna_netmask;
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hna_addr = tvb_get_ptr(tvb, 0, 4);
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hna = tvb_get_ipv4(tvb, 0);
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hna_netmask = tvb_get_guint8(tvb, 4);
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/* Set tree info */
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if (tree) {
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proto_item *ti = NULL;
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proto_tree *bat_batman_hna_tree = NULL;
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if (PTREE_DATA(tree)->visible) {
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ti = proto_tree_add_protocol_format(tree, proto_bat_plugin, tvb, 0, 5,
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"B.A.T.M.A.N. HNA: %s/%d",
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ip_to_str(hna_addr), hna_netmask);
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} else {
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ti = proto_tree_add_item(tree, proto_bat_plugin, tvb, 0, 5, FALSE);
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}
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bat_batman_hna_tree = proto_item_add_subtree(ti, ett_bat_batman_hna);
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proto_tree_add_ipv4(bat_batman_hna_tree, hf_bat_batman_hna_network, tvb, 0, 4, hna);
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proto_tree_add_item(bat_batman_hna_tree, hf_bat_batman_hna_netmask, tvb, 4, 1, FALSE);
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}
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}
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