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/* packet-lanforge.c
* Routines for "LANforge traffic generator IP protocol" dissection
* Copyright 2008
* Ben Greear <greearb@candelatech.com>
*
* Based on pktgen dissectory by:
* Francesco Fondelli <francesco dot fondelli, gmail dot com>
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
/* LANforge generates network traffic for load & performance testing.
* See http://www.candelatech.com for more info.
*/
#include "config.h"
#include <epan/packet.h>
void proto_register_lanforge(void);
void proto_reg_handoff_lanforge(void);
/* magic num used for heuristic */
#define LANFORGE_MAGIC 0x1a2b3c4d
/* Initialize the protocol and registered fields */
static int proto_lanforge = -1;
/* lanforge header */
static int hf_lanforge_crc = -1;
static int hf_lanforge_magic = -1;
static int hf_lanforge_src_session = -1;
static int hf_lanforge_dst_session = -1;
static int hf_lanforge_pld_len_l = -1;
static int hf_lanforge_pld_len_h = -1;
static int hf_lanforge_pld_len = -1;
static int hf_lanforge_pld_pattern = -1;
static int hf_lanforge_seq = -1;
static int hf_lanforge_tx_time_s = -1;
static int hf_lanforge_tx_time_ns = -1;
static int hf_lanforge_timestamp = -1;
/* Initialize the subtree pointer */
static gint ett_lanforge = -1;
/* entry point */
static gboolean dissect_lanforge(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
{
proto_item *ti;
proto_tree *lanforge_tree;
guint32 offset = 0;
guint32 magic, pld_len, pld_len_h;
/* check for min size */
if(tvb_captured_length(tvb) < 28) { /* Not a LANforge packet. */
return FALSE;
}
/* check for magic number */
magic = tvb_get_ntohl(tvb, 4);
if(magic != LANFORGE_MAGIC){
/* Not a LANforge packet. */
return FALSE;
}
/* Make entries in Protocol column and Info column on summary display */
col_set_str(pinfo->cinfo, COL_PROTOCOL, "LANforge");
col_add_fstr(pinfo->cinfo, COL_INFO, "Seq: %u", tvb_get_ntohl(tvb, 16));
/* create display subtree for the protocol */
ti = proto_tree_add_item(tree, proto_lanforge, tvb, 0, -1, ENC_NA);
lanforge_tree = proto_item_add_subtree(ti, ett_lanforge);
/* add items to the subtree */
proto_tree_add_item(lanforge_tree, hf_lanforge_crc, tvb, offset, 4, ENC_BIG_ENDIAN);
offset+=4;
proto_tree_add_item(lanforge_tree, hf_lanforge_magic, tvb, offset, 4, ENC_BIG_ENDIAN);
offset+=4;
proto_tree_add_item(lanforge_tree, hf_lanforge_src_session, tvb, offset, 2, ENC_BIG_ENDIAN);
offset+=2;
proto_tree_add_item(lanforge_tree, hf_lanforge_dst_session, tvb, offset, 2, ENC_BIG_ENDIAN);
offset+=2;
proto_tree_add_item_ret_uint(lanforge_tree, hf_lanforge_pld_len_l,
tvb, offset, 2, ENC_BIG_ENDIAN, &pld_len);
offset+=2;
proto_tree_add_item_ret_uint(lanforge_tree, hf_lanforge_pld_len_h,
tvb, offset, 1, ENC_BIG_ENDIAN, &pld_len_h);
offset+=1;
pld_len |= (pld_len_h << 16);
proto_tree_add_uint(lanforge_tree, hf_lanforge_pld_len, tvb, offset-3, 3, pld_len);
proto_tree_add_item(lanforge_tree, hf_lanforge_pld_pattern, tvb, offset, 1, ENC_BIG_ENDIAN);
offset+=1;
proto_tree_add_item(lanforge_tree, hf_lanforge_seq, tvb, offset, 4, ENC_BIG_ENDIAN);
offset+=4;
proto_tree_add_item(lanforge_tree, hf_lanforge_tx_time_s, tvb, offset, 4, ENC_BIG_ENDIAN);
offset+=4;
proto_tree_add_item(lanforge_tree, hf_lanforge_tx_time_ns, tvb, offset, 4, ENC_BIG_ENDIAN);
offset+=4;
proto_tree_add_item(lanforge_tree, hf_lanforge_timestamp,
tvb, offset - 8, 8, ENC_TIME_SECS_NSECS|ENC_BIG_ENDIAN);
if(tvb_reported_length_remaining(tvb, offset) > 0) /* random data */
call_data_dissector(tvb_new_subset_remaining(tvb, offset), pinfo,
lanforge_tree);
return TRUE;
}
/* Register the protocol with Wireshark */
void proto_register_lanforge(void)
{
/* Setup list of header fields */
static hf_register_info hf[] = {
{ &hf_lanforge_crc,
{
"CRC", "lanforge.CRC",
FT_UINT32, BASE_HEX, NULL, 0x0,
"The LANforge CRC number", HFILL
}
},
{ &hf_lanforge_magic,
{
"Magic number", "lanforge.magic",
FT_UINT32, BASE_HEX, NULL, 0x0,
"The LANforge magic number", HFILL
}
},
{ &hf_lanforge_src_session,
{
"Source session ID", "lanforge.source-session-id",
FT_UINT16, BASE_DEC, NULL, 0x0,
"The LANforge source session ID", HFILL
}
},
{ &hf_lanforge_dst_session,
{
"Dest session ID", "lanforge.dest-session-id",
FT_UINT16, BASE_DEC, NULL, 0x0,
"The LANforge dest session ID", HFILL
}
},
{ &hf_lanforge_pld_len_l,
{
"Payload Length(L)", "lanforge.pld-len-L",
FT_UINT16, BASE_DEC, NULL, 0x0,
"The LANforge payload length (low bytes)", HFILL
}
},
{ &hf_lanforge_pld_len_h,
{
"Payload Length(H)", "lanforge.pld-len-H",
FT_UINT8, BASE_DEC, NULL, 0x0,
"The LANforge payload length (high byte)", HFILL
}
},
{ &hf_lanforge_pld_len,
{
"Payload Length", "lanforge.pld-length",
FT_UINT32, BASE_DEC, NULL, 0x0,
"The LANforge payload length", HFILL
}
},
{ &hf_lanforge_pld_pattern,
{
"Payload Pattern", "lanforge.pld-pattern",
FT_UINT16, BASE_DEC, NULL, 0x0,
"The LANforge payload pattern", HFILL
}
},
{ &hf_lanforge_seq,
{
"Sequence Number", "lanforge.seqno",
FT_UINT32, BASE_DEC, NULL, 0x0,
"The LANforge Sequence Number", HFILL
}
},
{ &hf_lanforge_tx_time_s,
{
"Timestamp Secs", "lanforge.ts-secs",
FT_UINT32, BASE_DEC, NULL, 0x0,
NULL, HFILL
}
},
{ &hf_lanforge_tx_time_ns,
{
"Timestamp nsecs", "lanforge.ts-nsecs",
FT_UINT32, BASE_DEC, NULL, 0x0,
NULL, HFILL
}
},
{ &hf_lanforge_timestamp,
{
"Timestamp", "lanforge.timestamp",
FT_ABSOLUTE_TIME, ABSOLUTE_TIME_LOCAL, NULL, 0x0,
NULL, HFILL
}
}
};
/* Setup protocol subtree array */
static gint *ett[] = {
&ett_lanforge
};
/* Register the protocol name and description */
proto_lanforge = proto_register_protocol("LANforge Traffic Generator", "LANforge", "lanforge");
/* Required function calls to register the header fields and subtrees used */
proto_register_field_array(proto_lanforge, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
}
void proto_reg_handoff_lanforge(void)
{
/* Register as a heuristic UDP dissector */
heur_dissector_add("udp", dissect_lanforge, "LANforge over UDP", "lanforge_udp", proto_lanforge, HEURISTIC_ENABLE);
heur_dissector_add("tcp", dissect_lanforge, "LANforge over TCP", "lanforge_tcp", proto_lanforge, HEURISTIC_ENABLE);
}
/*
* Editor modelines - https://www.wireshark.org/tools/modelines.html
*
* Local variables:
* c-basic-offset: 4
* tab-width: 8
* indent-tabs-mode: nil
* End:
*
* vi: set shiftwidth=4 tabstop=8 expandtab:
* :indentSize=4:tabSize=8:noTabs=true:
*/
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