forked from osmocom/wireshark
![Michael Mann](/assets/img/avatar_default.png)
This saves many dissectors the need to find the data dissector and store a handle to it. There were also some that were finding it, but not using it. For others this was the only reason for their handoff function, so it could be eliminated. Change-Id: I5d3f951ee1daa3d30c060d21bd12bbc881a8027b Reviewed-on: https://code.wireshark.org/review/14530 Petri-Dish: Michael Mann <mmann78@netscape.net> Reviewed-by: Michael Mann <mmann78@netscape.net>
203 lines
5.7 KiB
C
203 lines
5.7 KiB
C
/* packet-pktgen.c
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* Routines for "Linux pktgen" dissection
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* Copyright 2006 _FF_
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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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/* FF:
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* The linux packet generator is a tool to generate packets at very high speed in the kernel.
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* See linux/net/core/pktgen.c and linux/Documentation/networking/pktgen.txt for more info.
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*/
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#include "config.h"
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#include <epan/packet.h>
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void proto_register_pktgen(void);
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void proto_reg_handoff_pktgen(void);
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/* magic num used for heuristic */
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#define PKTGEN_MAGIC 0xbe9be955
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/* Initialize the protocol and registered fields */
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static int proto_pktgen = -1;
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/* pktgen header */
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static int hf_pktgen_magic = -1;
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static int hf_pktgen_seqnum = -1;
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static int hf_pktgen_tvsec = -1;
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static int hf_pktgen_tvusec = -1;
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static int hf_pktgen_timestamp = -1;
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/* Initialize the subtree pointer */
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static gint ett_pktgen = -1;
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/* entry point */
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static gboolean dissect_pktgen(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
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{
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proto_item *ti = NULL;
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proto_item *tmp = NULL;
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proto_tree *pktgen_tree = NULL;
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guint32 offset = 0;
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nstime_t tstamp;
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guint32 magic;
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/* check for min size */
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if (tvb_reported_length(tvb) < 16) { /* Not a PKTGEN packet. */
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return FALSE;
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}
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/* check for magic number */
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magic = tvb_get_ntohl(tvb,0);
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if (magic != PKTGEN_MAGIC) {
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/* Not a PKTGEN packet. */
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return FALSE;
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}
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/* Make entries in Protocol column and Info column on summary display */
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "PKTGEN");
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col_add_fstr(pinfo->cinfo, COL_INFO, "Seq: %u", tvb_get_ntohl(tvb, 4));
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if (tree) {
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/* create display subtree for the protocol */
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ti = proto_tree_add_item(tree, proto_pktgen, tvb, 0, -1, ENC_NA);
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pktgen_tree = proto_item_add_subtree(ti, ett_pktgen);
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/* add items to the subtree */
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proto_tree_add_item(pktgen_tree, hf_pktgen_magic, tvb, offset, 4, ENC_BIG_ENDIAN);
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offset += 4;
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proto_tree_add_item(pktgen_tree, hf_pktgen_seqnum, tvb, offset, 4, ENC_BIG_ENDIAN);
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offset += 4;
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tstamp.secs = tvb_get_ntohl(tvb, offset);
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tmp = proto_tree_add_item(pktgen_tree, hf_pktgen_tvsec, tvb, offset, 4, ENC_BIG_ENDIAN);
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PROTO_ITEM_SET_GENERATED(tmp);
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offset += 4;
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tstamp.nsecs = tvb_get_ntohl(tvb, offset) /* microsecond on the wire so... */ * 1000;
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tmp = proto_tree_add_item(pktgen_tree, hf_pktgen_tvusec, tvb, offset, 4, ENC_BIG_ENDIAN);
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PROTO_ITEM_SET_GENERATED(tmp);
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offset += 4;
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proto_tree_add_time(pktgen_tree, hf_pktgen_timestamp, tvb, offset - 8, 8, &tstamp);
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if (tvb_reported_length_remaining(tvb, offset)) /* random data */
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call_data_dissector(tvb_new_subset_remaining(tvb, offset), pinfo,
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pktgen_tree);
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}
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return TRUE;
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}
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/* Register the protocol with Wireshark */
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void proto_register_pktgen(void)
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{
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/* Setup list of header fields */
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static hf_register_info hf[] = {
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{ &hf_pktgen_magic,
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{
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"Magic number", "pktgen.magic",
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FT_UINT32, BASE_HEX, NULL, 0x0,
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"The pktgen magic number", HFILL
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}
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},
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{ &hf_pktgen_seqnum,
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{
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"Sequence number", "pktgen.seqnum",
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FT_UINT32, BASE_DEC, NULL, 0x0,
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NULL, HFILL
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}
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},
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{ &hf_pktgen_tvsec,
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{
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"Timestamp tvsec", "pktgen.tvsec",
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FT_UINT32, BASE_DEC, NULL, 0x0,
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"Timestamp tvsec part", HFILL
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}
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},
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{ &hf_pktgen_tvusec,
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{
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"Timestamp tvusec", "pktgen.tvusec",
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FT_UINT32, BASE_DEC, NULL, 0x0,
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"Timestamp tvusec part", HFILL
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}
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},
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{ &hf_pktgen_timestamp,
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{
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"Timestamp", "pktgen.timestamp",
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FT_ABSOLUTE_TIME, ABSOLUTE_TIME_LOCAL, NULL, 0x0,
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NULL, HFILL
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}
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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_pktgen
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};
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/* Register the protocol name and description */
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proto_pktgen = proto_register_protocol("Linux Kernel Packet Generator", "PKTGEN", "pktgen");
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/* Required function calls to register the header fields and subtrees used */
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proto_register_field_array(proto_pktgen, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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}
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void proto_reg_handoff_pktgen(void)
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{
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/* Register as a heuristic UDP dissector */
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heur_dissector_add("udp", dissect_pktgen, "Linux Kernel Packet Generator over UDP", "pktgen_udp", proto_pktgen, HEURISTIC_ENABLE);
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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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