forked from osmocom/wireshark
![Dario Lombardo](/assets/img/avatar_default.png)
Change-Id: I92c94448e6641716d03158a5f332c8b53709423a Reviewed-on: https://code.wireshark.org/review/25756 Petri-Dish: Dario Lombardo <lomato@gmail.com> Reviewed-by: Anders Broman <a.broman58@gmail.com>
191 lines
5.1 KiB
C
191 lines
5.1 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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* SPDX-License-Identifier: GPL-2.0-or-later
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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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