![Michael Mann](/assets/img/avatar_default.png)
Other minor cleanups while in the area. Change-Id: I8ea59205cfe6fab643d8fe01b75ce91532004fd9 Reviewed-on: https://code.wireshark.org/review/4004 Reviewed-by: Michael Mann <mmann78@netscape.net> Petri-Dish: Michael Mann <mmann78@netscape.net> Tested-by: Petri Dish Buildbot <buildbot-no-reply@wireshark.org> Reviewed-by: Alexis La Goutte <alexis.lagoutte@gmail.com>
232 lines
6.6 KiB
C
232 lines
6.6 KiB
C
/* packet-pw-eth.c
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* Routines for ethernet PW dissection: it should conform to RFC 4448.
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*
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* Copyright 2008 _FF_
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*
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* Francesco Fondelli <francesco dot fondelli, gmail dot com>
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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 "config.h"
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#include <glib.h>
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#include <epan/packet.h>
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#include <epan/addr_resolv.h>
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#include "packet-mpls.h"
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void proto_register_pw_eth(void);
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void proto_reg_handoff_pw_eth(void);
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static gint proto_pw_eth_cw = -1;
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static gint proto_pw_eth_nocw = -1;
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static gint proto_pw_eth_heuristic = -1;
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static gint ett_pw_eth = -1;
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static int hf_pw_eth = -1;
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static int hf_pw_eth_cw = -1;
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static int hf_pw_eth_cw_sequence_number = -1;
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static dissector_handle_t eth_withoutfcs_handle;
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static dissector_handle_t pw_eth_handle_cw;
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static dissector_handle_t pw_eth_handle_nocw;
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static int
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dissect_pw_eth_cw(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
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{
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tvbuff_t *next_tvb;
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guint16 sequence_number;
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if (tvb_reported_length_remaining(tvb, 0) < 4) {
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return 0;
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}
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if (dissect_try_cw_first_nibble(tvb, pinfo, tree))
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return tvb_captured_length(tvb);
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sequence_number = tvb_get_ntohs(tvb, 2);
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if (tree) {
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proto_tree *pw_eth_tree;
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proto_item *ti;
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ti = proto_tree_add_boolean(tree, hf_pw_eth_cw,
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tvb, 0, 0, TRUE);
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PROTO_ITEM_SET_HIDDEN(ti);
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ti = proto_tree_add_item(tree, proto_pw_eth_cw,
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tvb, 0, 4, ENC_NA);
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pw_eth_tree = proto_item_add_subtree(ti, ett_pw_eth);
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proto_tree_add_uint_format(pw_eth_tree,
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hf_pw_eth_cw_sequence_number,
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tvb, 2, 2, sequence_number,
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"Sequence Number: %d",
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sequence_number);
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}
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next_tvb = tvb_new_subset_remaining(tvb, 4);
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{
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call_dissector(eth_withoutfcs_handle, next_tvb, pinfo, tree);
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}
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return tvb_captured_length(tvb);
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}
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static void
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dissect_pw_eth_nocw(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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tvbuff_t *next_tvb;
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if (tree) {
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proto_item *ti;
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ti = proto_tree_add_boolean(tree, hf_pw_eth, tvb, 0, 0, TRUE);
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PROTO_ITEM_SET_HIDDEN(ti);
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}
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next_tvb = tvb_new_subset_remaining(tvb, 0);
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{
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call_dissector(eth_withoutfcs_handle, next_tvb, pinfo, tree);
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}
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}
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/*
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* FF: this function returns TRUE if the first 12 bytes in tvb looks like
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* two valid ethernet addresses. FALSE otherwise.
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*/
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static gboolean
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looks_like_plain_eth(tvbuff_t *tvb _U_)
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{
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const gchar *manuf_name_da;
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const gchar *manuf_name_sa;
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if (tvb_reported_length_remaining(tvb, 0) < 14) {
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return FALSE;
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}
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manuf_name_da = tvb_get_manuf_name_if_known(tvb, 0);
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manuf_name_sa = tvb_get_manuf_name_if_known(tvb, 6);
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if (manuf_name_da && manuf_name_sa) {
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return TRUE;
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}
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return FALSE;
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}
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static void
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dissect_pw_eth_heuristic(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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guint8 first_nibble = (tvb_get_guint8(tvb, 0) >> 4) & 0x0F;
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if (looks_like_plain_eth(tvb))
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call_dissector(pw_eth_handle_nocw, tvb, pinfo, tree);
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else if (first_nibble == 0)
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call_dissector(pw_eth_handle_cw, tvb, pinfo, tree);
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else
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call_dissector(pw_eth_handle_nocw, tvb, pinfo, tree);
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}
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void
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proto_register_pw_eth(void)
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{
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static hf_register_info hf[] = {
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{
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&hf_pw_eth,
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{
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"PW (ethernet)",
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"pweth", FT_BOOLEAN,
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BASE_NONE, NULL, 0x0, NULL, HFILL
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}
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},
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{
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&hf_pw_eth_cw,
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{
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"PW Control Word (ethernet)",
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"pweth.cw", FT_BOOLEAN,
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BASE_NONE, NULL, 0x0, NULL, HFILL
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}
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},
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{
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&hf_pw_eth_cw_sequence_number,
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{
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"PW sequence number (ethernet)",
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"pweth.cw.sequence_number", FT_UINT16,
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BASE_DEC, NULL, 0x0, NULL, HFILL
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}
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}
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};
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static gint *ett[] = {
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&ett_pw_eth
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};
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proto_pw_eth_cw =
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proto_register_protocol("PW Ethernet Control Word",
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"Ethernet PW (with CW)",
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"pwethcw");
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proto_pw_eth_nocw =
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proto_register_protocol("Ethernet PW (no CW)", /* not displayed */
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"Ethernet PW (no CW)",
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"pwethnocw");
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proto_pw_eth_heuristic =
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proto_register_protocol("Ethernet PW (CW heuristic)", /* not disp. */
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"Ethernet PW (CW heuristic)",
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"pwethheuristic");
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proto_register_field_array(proto_pw_eth_cw, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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new_register_dissector("pw_eth_cw", dissect_pw_eth_cw, proto_pw_eth_cw);
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register_dissector("pw_eth_nocw", dissect_pw_eth_nocw,
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proto_pw_eth_nocw);
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register_dissector("pw_eth_heuristic", dissect_pw_eth_heuristic,
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proto_pw_eth_heuristic);
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}
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void
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proto_reg_handoff_pw_eth(void)
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{
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dissector_handle_t pw_eth_handle_heuristic;
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eth_withoutfcs_handle = find_dissector("eth_withoutfcs");
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pw_eth_handle_cw = find_dissector("pw_eth_cw");
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dissector_add_for_decode_as("mpls.label", pw_eth_handle_cw);
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pw_eth_handle_nocw = find_dissector("pw_eth_nocw");
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dissector_add_for_decode_as("mpls.label", pw_eth_handle_nocw);
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pw_eth_handle_heuristic = find_dissector("pw_eth_heuristic");
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dissector_add_for_decode_as("mpls.label", pw_eth_handle_heuristic);
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}
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/*
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* Editor modelines - http://www.wireshark.org/tools/modelines.html
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*
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* Local variables:
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* c-basic-offset: 4
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* tab-width: 8
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* indent-tabs-mode: nil
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* End:
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*
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* vi: set shiftwidth=4 tabstop=8 expandtab:
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* :indentSize=4:tabSize=8:noTabs=true:
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*/
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