forked from osmocom/wireshark
![Pascal Quantin](/assets/img/avatar_default.png)
Based on the heuristic suggested by Jasper, check whether ethertype matches IPv4, ARP, RARP, VLAN or IPv6 and decode payload as Ethernet PW (CW heuristic) by default. Otherwise display payload as data by default. This can be overridden by the 'Decode As' configuration. Follow up of g7ca0472 Bug: 11271 Change-Id: Idb2ce1f8b967813a8f4a5e29e6005d5442729395 Reviewed-on: https://code.wireshark.org/review/8912 Petri-Dish: Pascal Quantin <pascal.quantin@gmail.com> Tested-by: Petri Dish Buildbot <buildbot-no-reply@wireshark.org> Reviewed-by: Michael Mann <mmann78@netscape.net> Reviewed-by: Pascal Quantin <pascal.quantin@gmail.com>
227 lines
6.5 KiB
C
227 lines
6.5 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 <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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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 = new_create_dissector_handle( dissect_pw_eth_cw, proto_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 = create_dissector_handle( dissect_pw_eth_nocw, proto_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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