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wireshark/epan/dissectors/packet-avsp.c
Guy Harris 7e7db3e91c sll: add support for LINKTYPE_LINUX_SLL2. 
Different header, with a different size, an additional field, and with
fields being in a different order.

Distinguish between V1 and V2 by giving the version.

That means we can no longer use the "ethertype" dissector as it stands,
because the packet type field isn't at the end of the header, right
before the payload; pull the "add the type field to the protocol tree"
functionality out of the "ethertype" dissector and leave it up to the
dissector calling it.

Change-Id: I72b8a2483c0a539919fbe5d35fd7e60bff4bf75a
Reviewed-on: https://code.wireshark.org/review/37169
Petri-Dish: Guy Harris <gharris@sonic.net>
Tested-by: Petri Dish Buildbot
Reviewed-by: Guy Harris <gharris@sonic.net>
2020-05-09 03:14:50 +00:00

315 lines
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/* packet-avsp.c
* Arista Vendor Specific ethertype Protocol (AVSP)
*
* Copyright (c) 2018 by Arista Networks
* Author: Nikhil AP <nikhilap@arista.com>
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1999 Gerald Combs
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
/* Arista Vendor-Specific EtherType Protocol Identifier
*
* Arista applied for, and received the assignment of, a vendor-specific EtherType Protocol Identifier in May of 2016. Details below:
*
* Ethertype number is: D28B
* Issue date is: May 12, 2016
*
* Arista Subtype 0x01 is Timestamp L2 Header
*
* The timestamp L2 header consist of the following fields:
*
* Arista EtherType (0xD28B)
* Two-byte protocol subtype of 0x1
* Two-byte protocol version: 0x10 for 64-bit timestamp and 0x20 for 48-bit timestamp
* UTC timestamp value in IEEE 1588 time of day format (either 64-bit or 48-bit) with the lower 32-bits representing nanoseconds and upper bits representing seconds.
*/
#include "config.h"
#include <epan/packet.h>
#include <epan/etypes.h>
#include <epan/expert.h>
#define ARISTA_TIMESTAMP_SUBTYPE 0x01
#define ARISTA_TIMESTAMP_64_TAI 0x10
#define ARISTA_TIMESTAMP_64_UTC 0x110
#define ARISTA_TIMESTAMP_48_TAI 0x20
#define ARISTA_TIMESTAMP_48_UTC 0x120
void proto_reg_handoff_avsp(void);
void proto_register_avsp(void);
static int proto_avsp = -1;
/* sub trees */
static gint ett_avsp = -1;
static gint ett_avsp_ts_48 = -1;
static gint ett_avsp_ts_64 = -1;
/* avsp variables */
static int hf_avsp_sub_type = -1;
static int hf_avsp_ts_version = -1;
static int hf_avsp_ts_64_tai = -1;
static int hf_avsp_ts_64_utc = -1;
static int hf_avsp_ts_64_sec = -1;
static int hf_avsp_ts_64_ns = -1;
static int hf_avsp_ts_48_tai = -1;
static int hf_avsp_ts_48_utc = -1;
static int hf_avsp_ts_48_sec = -1;
static int hf_avsp_ts_48_ns = -1;
static int hf_avsp_etype = -1;
static int hf_avsp_trailer = -1;
static dissector_handle_t ethertype_handle;
static expert_field ei_avsp_ts_unknown_version = EI_INIT;
static const value_string arista_subtype[] = {
{ARISTA_TIMESTAMP_SUBTYPE, "timestamp"},
{0, NULL}
};
static const value_string ts_versions[] = {
{ARISTA_TIMESTAMP_64_TAI, "Version 1"},
{ARISTA_TIMESTAMP_64_UTC, "Version 11"},
{ARISTA_TIMESTAMP_48_TAI, "Version 2"},
{ARISTA_TIMESTAMP_48_UTC, "Version 12"},
{0, NULL}
};
static ei_register_info ei[] = {
{ &ei_avsp_ts_unknown_version, { "avsp.ts.unknown_version", PI_SEQUENCE, PI_WARN, "Unknown timestamp version", EXPFILL }},
};
static int
dissect_avsp(tvbuff_t * tvb, packet_info * pinfo, proto_tree * tree, void *data _U_)
{
guint8 offset = 0;
int version, subtype;
/* col_set_str() function is used to set the column string */
col_set_str(pinfo->cinfo, COL_PROTOCOL, "AVSP");
col_clear(pinfo->cinfo, COL_INFO);
proto_item *ti = NULL;
proto_tree *avsp_tree = NULL, *avsp_48_tree = NULL, *avsp_64_tree;
/* Adding Items and Values to the Protocol Tree */
ti = proto_tree_add_item(tree, proto_avsp, tvb, 0, -1,
ENC_NA);
avsp_tree = proto_item_add_subtree(ti, ett_avsp);
/* adding each item to avsp */
proto_tree_add_item_ret_uint(avsp_tree, hf_avsp_sub_type, tvb,
offset, 2, ENC_BIG_ENDIAN, &subtype);
offset += 2;
if (subtype == ARISTA_TIMESTAMP_SUBTYPE) {
proto_tree_add_item_ret_uint(avsp_tree, hf_avsp_ts_version, tvb, offset,
2, ENC_BIG_ENDIAN, &version);
offset += 2;
switch (version) {
case ARISTA_TIMESTAMP_64_TAI:
ti = proto_tree_add_item(avsp_tree, hf_avsp_ts_64_tai, tvb, 0, -1,
ENC_NA);
avsp_64_tree = proto_item_add_subtree(ti, ett_avsp);
col_add_fstr(pinfo->cinfo, COL_INFO, "64bit TAI timestamp");
proto_tree_add_item(avsp_64_tree, hf_avsp_ts_64_sec, tvb, offset,
4, ENC_BIG_ENDIAN);
offset += 4;
proto_tree_add_item(avsp_64_tree, hf_avsp_ts_64_ns, tvb, offset,
4, ENC_BIG_ENDIAN);
offset += 4;
break;
case ARISTA_TIMESTAMP_64_UTC:
ti = proto_tree_add_item(avsp_tree, hf_avsp_ts_64_utc, tvb, 0, -1,
ENC_NA);
avsp_64_tree = proto_item_add_subtree(ti, ett_avsp);
col_add_fstr(pinfo->cinfo, COL_INFO, "64bit UTC timestamp");
proto_tree_add_item(avsp_64_tree, hf_avsp_ts_64_sec, tvb, offset,
4, ENC_BIG_ENDIAN);
offset += 4;
proto_tree_add_item(avsp_64_tree, hf_avsp_ts_64_ns, tvb, offset,
4, ENC_BIG_ENDIAN);
offset += 4;
break;
case ARISTA_TIMESTAMP_48_TAI:
ti = proto_tree_add_item(avsp_tree, hf_avsp_ts_48_tai, tvb, 0, -1,
ENC_NA);
avsp_48_tree = proto_item_add_subtree(ti, ett_avsp);
col_add_fstr(pinfo->cinfo, COL_INFO, "48bit TAI timestamp");
proto_tree_add_item(avsp_48_tree, hf_avsp_ts_48_sec, tvb, offset,
2, ENC_BIG_ENDIAN);
offset += 2;
proto_tree_add_item(avsp_48_tree, hf_avsp_ts_48_ns, tvb, offset,
4, ENC_BIG_ENDIAN);
offset += 4;
break;
case ARISTA_TIMESTAMP_48_UTC:
ti = proto_tree_add_item(avsp_tree, hf_avsp_ts_48_utc, tvb, 0, -1,
ENC_NA);
avsp_48_tree = proto_item_add_subtree(ti, ett_avsp);
col_add_fstr(pinfo->cinfo, COL_INFO, "48bit UTC timestamp");
proto_tree_add_item(avsp_48_tree, hf_avsp_ts_48_sec, tvb, offset,
2, ENC_BIG_ENDIAN);
offset += 2;
proto_tree_add_item(avsp_48_tree, hf_avsp_ts_48_ns, tvb, offset,
4, ENC_BIG_ENDIAN);
offset += 4;
break;
default:
expert_add_info_format(pinfo, ti, &ei_avsp_ts_unknown_version,
"Unknown timestamp version: 0x%0x", version);
return tvb_captured_length(tvb);
}
}
guint16 encap_proto;
encap_proto = tvb_get_ntohs(tvb, offset);
proto_tree_add_uint(avsp_tree, hf_avsp_etype, tvb, offset, 2, encap_proto);
offset += 2;
ethertype_data_t ethertype_data;
ethertype_data.etype = encap_proto;
ethertype_data.payload_offset = offset;
ethertype_data.fh_tree = avsp_tree;
ethertype_data.trailer_id = hf_avsp_trailer;
ethertype_data.fcs_len = 0;
call_dissector_with_data(ethertype_handle, tvb, pinfo, tree, &ethertype_data);
return tvb_captured_length(tvb);
}
void proto_reg_handoff_avsp(void)
{
/* the handle for the dynamic dissector */
dissector_handle_t avsp_handle;
avsp_handle =
create_dissector_handle(dissect_avsp, proto_avsp);
dissector_add_uint("ethertype", ETHERTYPE_AVSP, avsp_handle);
ethertype_handle = find_dissector_add_dependency("ethertype", proto_avsp);
}
void proto_register_avsp(void)
{
/* Field Registration */
static hf_register_info hf[] = {
/* For avsp */
{&hf_avsp_sub_type,
{"Sub Type", "avsp.sub_type",
FT_UINT16, BASE_DEC,
VALS(arista_subtype), 0x0,
NULL, HFILL}
},
{&hf_avsp_ts_version,
{"Version", "avsp.ver",
FT_UINT16, BASE_HEX,
VALS(ts_versions), 0x0,
NULL, HFILL}
},
{&hf_avsp_ts_64_tai,
{"Timestamp (TAI)", "avsp.64ts",
FT_NONE, BASE_NONE,
NULL, 0x0,
NULL, HFILL}
},
{&hf_avsp_ts_64_utc,
{"Timestamp (UTC)", "avsp.64ts",
FT_NONE, BASE_NONE,
NULL, 0x0,
NULL, HFILL}
},
{&hf_avsp_ts_64_sec,
{"Seconds", "avsp.64sec",
FT_UINT32, BASE_DEC,
NULL, 0x0,
NULL, HFILL}
},
{&hf_avsp_ts_64_ns,
{"Nanoseconds", "avsp.64ns",
FT_UINT32, BASE_DEC,
NULL, 0x0,
NULL, HFILL}
},
{&hf_avsp_ts_48_tai,
{"Timestamp (TAI)", "avsp.48ts",
FT_NONE, BASE_NONE,
NULL, 0x0,
NULL, HFILL}
},
{&hf_avsp_ts_48_utc,
{"Timestamp (UTC)", "avsp.48ts",
FT_NONE, BASE_NONE,
NULL, 0x0,
NULL, HFILL}
},
{&hf_avsp_ts_48_sec,
{"Seconds", "avsp.48sec",
FT_UINT16, BASE_DEC,
NULL, 0x0,
NULL, HFILL}
},
{&hf_avsp_ts_48_ns,
{"Nanoseconds", "avsp.48ns",
FT_UINT32, BASE_DEC,
NULL, 0x0,
NULL, HFILL}
},
{&hf_avsp_etype,
{"Type", "avsp.etype",
FT_UINT16, BASE_HEX,
VALS(etype_vals), 0x0,
"Ethertype", HFILL}
},
{&hf_avsp_trailer,
{"Trailer", "avsp.trailer",
FT_BYTES, BASE_NONE,
NULL, 0x0,
"AVSP Trailer", HFILL}
},
};
/* Setup protocol subtree array */
static gint *ett[] = {
&ett_avsp, /* main avsp tree */
&ett_avsp_ts_48, /* subtree above for 48 bit timestamp */
&ett_avsp_ts_64, /* subtree above for 64 bit timestamp */
};
/* registering the avsp protocol with 3 names */
proto_avsp = proto_register_protocol("Arista Vendor Specific Protocol",
"avsp",
"avsp"
);
/* Register header fields and subtrees. */
proto_register_field_array(proto_avsp, hf, array_length(hf));
/* To register subtree types, pass an array of pointers */
proto_register_subtree_array(ett, array_length(ett));
expert_register_field_array(expert_register_protocol(proto_avsp),
ei, array_length(ei));
}
/*
* 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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