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|
/* packet-extreme-internal-eth.c
* Routines for the disassembly of Extreme Networks internal
* Ethernet capture headers
*
* Copyright 2021 Joerg Mayer (see AUTHORS file)
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
/*
* It is possible to create internal capture in EXOS with
* debug packet capture ...
*
* List of interfaces on all VRs:
* run script shell.py cat /proc/net/dev
* on older software the following should work as well:
* debug packet capture on cmd-args "-D -1"
*
* See:
* https://extremeportal.force.com/ExtrArticleDetail?an=000079573
* https://extremeportal.force.com/ExtrArticleDetail?an=000082238
* https://extremeportal.force.com/ExtrArticleDetail?an=000079220
*
* This capture begins with an internal header (maybe containing some HiGig variant?),
* followed by the "original" Ethernet frame.
*/
/*
* TODO
* 00 - 01: Unknown
* always zero for incoming(?)
* often non-zero for outgoing
* 10 - 23: Unknown (traffic properties?)
* 28 - 29: Unknown
* always zero(?)
* 32 - 33: Unknown
* always zero(?)
*/
#include "config.h"
#include <epan/packet.h>
#include <epan/etypes.h>
#include <epan/expert.h>
void proto_register_exeh(void);
void proto_reg_handoff_exeh(void);
static dissector_handle_t ethnofcs_handle;
static int proto_exeh = -1;
/* EXEH data */
static int hf_exeh_unknown_00_01 = -1;
static int hf_exeh_module1 = -1;
static int hf_exeh_port1 = -1;
static int hf_exeh_module2 = -1; /* m2 + p2 always zero for outgoing(?) */
static int hf_exeh_port2 = -1;
static int hf_exeh_unknown_10_16 = -1;
static int hf_exeh_unknown_17_0xfd = -1;
static int hf_exeh_unknown_17_0x02 = -1;
static int hf_exeh_unknown_18_21 = -1;
static int hf_exeh_unknown_22_23 = -1;
static int hf_exeh_incoming_framesource = -1;
static int hf_exeh_outgoing_framesource = -1;
static int hf_exeh_vlan = -1;
static int hf_exeh_unknown_28_29 = -1;
static int hf_exeh_dir = -1;
static int hf_exeh_unknown_32_33 = -1;
static int hf_exeh_etype = -1;
static int hf_exeh_etypelen = -1;
static int hf_exeh_etypedata = -1;
static expert_field ei_exeh_unexpected_value = EI_INIT;
static expert_field ei_exeh_unequal_ports = EI_INIT;
static expert_field ei_exeh_incoming_framesource = EI_INIT;
static expert_field ei_exeh_outgoing_framesource = EI_INIT;
static gint ett_exeh = -1;
#define PROTO_SHORT_NAME "EXEH"
#define PROTO_LONG_NAME "EXtreme extra Eth Header"
static const value_string exeh_direction_vals[] = {
{0x07, "Incoming"},
{0xff, "Outgoing"},
{0, NULL},
};
static const value_string exeh_outgoing_vlanid_vals[] = {
{0x0000, "No tag or VLAN ID = 0"},
{0x000f, "Has VLAN ID"},
{0, NULL},
};
static const value_string exeh_incoming_framesource_vals[] = {
{0x0000, "N/A"},
{0, NULL},
};
static const value_string exeh_outgoing_framesource_vals[] = {
{0x0000, "CPU"},
{0x4248, "Broadcom Hardware"},
{0, NULL},
};
static int
dissect_exeh(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{
proto_item *ti;
proto_tree *exeh_tree;
guint32 offset = 0;
guint32 etype, module1, port1, module2, port2, direction, framesource;
gint32 databytes;
tvbuff_t *frame_tvb;
col_set_str(pinfo->cinfo, COL_PROTOCOL, PROTO_SHORT_NAME);
col_set_str(pinfo->cinfo, COL_INFO, PROTO_SHORT_NAME ":");
ti = proto_tree_add_item(tree, proto_exeh, tvb, offset, -1,
ENC_NA);
exeh_tree = proto_item_add_subtree(ti, ett_exeh);
direction = tvb_get_ntohs(tvb, 30);
proto_tree_add_item(exeh_tree, hf_exeh_unknown_00_01, tvb, offset, 2, ENC_NA);
offset += 2;
proto_tree_add_item_ret_uint(exeh_tree, hf_exeh_module1, tvb, offset, 2, ENC_BIG_ENDIAN, &module1);
offset += 2;
proto_tree_add_item_ret_uint(exeh_tree, hf_exeh_port1, tvb, offset, 2, ENC_BIG_ENDIAN, &port1);
offset += 2;
proto_tree_add_item_ret_uint(exeh_tree, hf_exeh_module2, tvb, offset, 2, ENC_BIG_ENDIAN, &module2);
offset += 2;
ti = proto_tree_add_item_ret_uint(exeh_tree, hf_exeh_port2, tvb, offset, 2, ENC_BIG_ENDIAN, &port2);
if ( !(direction == 255 && module2 == 0) && (module1 != module2 || port1 != port2) )
expert_add_info(pinfo, ti, &ei_exeh_unequal_ports);
offset += 2;
proto_tree_add_item(exeh_tree, hf_exeh_unknown_10_16, tvb, offset, 7, ENC_NA);
offset += 7;
proto_tree_add_item(exeh_tree, hf_exeh_unknown_17_0xfd, tvb, offset, 1, ENC_NA);
proto_tree_add_item(exeh_tree, hf_exeh_unknown_17_0x02, tvb, offset, 1, ENC_NA);
offset += 1;
proto_tree_add_item(exeh_tree, hf_exeh_unknown_18_21, tvb, offset, 4, ENC_NA);
offset += 4;
proto_tree_add_item(exeh_tree, hf_exeh_unknown_22_23, tvb, offset, 2, ENC_BIG_ENDIAN);
offset += 2;
if ( direction == 7 ) {
ti = proto_tree_add_item_ret_uint(exeh_tree, hf_exeh_incoming_framesource, tvb, offset, 2, ENC_BIG_ENDIAN, &framesource);
if ( framesource != 0 )
expert_add_info(pinfo, ti, &ei_exeh_incoming_framesource);
} else { /* Direction == 255 */
ti = proto_tree_add_item_ret_uint(exeh_tree, hf_exeh_outgoing_framesource, tvb, offset, 2, ENC_BIG_ENDIAN, &framesource);
if ( framesource != 0 && framesource != 0x4248 )
expert_add_info(pinfo, ti, &ei_exeh_outgoing_framesource);
}
offset += 2;
proto_tree_add_item(exeh_tree, hf_exeh_vlan, tvb, offset, 2, ENC_BIG_ENDIAN);
offset += 2;
proto_tree_add_item(exeh_tree, hf_exeh_unknown_28_29, tvb, offset, 2, ENC_NA);
offset += 2;
proto_tree_add_item(exeh_tree, hf_exeh_dir, tvb, offset, 2, ENC_BIG_ENDIAN);
offset += 2;
proto_tree_add_item(exeh_tree, hf_exeh_unknown_32_33, tvb, offset, 2, ENC_NA);
offset += 2;
proto_tree_add_item_ret_uint(exeh_tree, hf_exeh_etype, tvb, offset, 2, ENC_BIG_ENDIAN, &etype);
switch (etype) {
case 0x8100: /* VLAN/VMAN Tag */
ti = proto_tree_add_item_ret_int(exeh_tree, hf_exeh_etypelen, tvb, offset+2, 2, ENC_BIG_ENDIAN, &databytes);
if (tvb_reported_length_remaining(tvb, offset) != databytes)
expert_add_info(pinfo, ti, &ei_exeh_unexpected_value);
break;
default:
proto_tree_add_item(exeh_tree, hf_exeh_etypedata, tvb, offset+2, 2, ENC_BIG_ENDIAN);
}
offset += 4;
frame_tvb = tvb_new_subset_remaining(tvb, offset);
call_dissector(ethnofcs_handle, frame_tvb, pinfo, tree);
return tvb_captured_length(tvb);
}
void
proto_register_exeh(void)
{
static hf_register_info hf[] = {
/* EXEH data */
{ &hf_exeh_unknown_00_01,
{ "Unknown_00", "exeh.unknown00", FT_BYTES, BASE_NONE, NULL,
0x0, NULL, HFILL }},
{ &hf_exeh_module1,
{ "Module", "exeh.module1", FT_UINT16, BASE_DEC, NULL,
0x0, NULL, HFILL }},
{ &hf_exeh_port1,
{ "Port", "exeh.port1", FT_UINT16, BASE_DEC, NULL,
0x0, NULL, HFILL }},
{ &hf_exeh_module2,
{ "Module", "exeh.module2", FT_UINT16, BASE_DEC, NULL,
0x0, NULL, HFILL }},
{ &hf_exeh_port2,
{ "Port", "exeh.port2", FT_UINT16, BASE_DEC, NULL,
0x0, NULL, HFILL }},
{ &hf_exeh_unknown_10_16,
{ "Unknown_10 (incoming specific?)", "exeh.unknown10", FT_BYTES, BASE_NONE, NULL,
0x0, NULL, HFILL }},
{ &hf_exeh_unknown_17_0xfd,
{ "Unknown_17", "exeh.unknown17", FT_UINT8, BASE_HEX, NULL,
0xfd, NULL, HFILL }},
{ &hf_exeh_unknown_17_0x02,
{ "Unknown_17 (Add dot1Q?)", "exeh.unknown17.dot1q", FT_BOOLEAN, 8, TFS(&tfs_no_yes),
0x02, NULL, HFILL }},
{ &hf_exeh_unknown_18_21,
{ "Unknown_18 (outgoing specific?)", "exeh.unknown18", FT_BYTES, BASE_NONE, NULL,
0x0, NULL, HFILL }},
{ &hf_exeh_unknown_22_23,
{ "Add VLAN ID?", "exeh.unknown22", FT_UINT16, BASE_NONE, VALS(exeh_outgoing_vlanid_vals),
0x0, NULL, HFILL }},
{ &hf_exeh_incoming_framesource,
{ "Frame source", "exeh.framesource", FT_UINT16, BASE_HEX, VALS(exeh_incoming_framesource_vals),
0x0, NULL, HFILL }},
{ &hf_exeh_outgoing_framesource,
{ "Frame source", "exeh.framesource", FT_UINT16, BASE_HEX, VALS(exeh_outgoing_framesource_vals),
0x0, NULL, HFILL }},
{ &hf_exeh_vlan,
{ "Transport VLAN", "exeh.vlan", FT_UINT16, BASE_DEC, NULL,
0x0, NULL, HFILL }},
{ &hf_exeh_unknown_28_29,
{ "Unknown_28", "exeh.unknown28", FT_BYTES, BASE_NONE, NULL,
0x0, NULL, HFILL }},
{ &hf_exeh_dir,
{ "Direction", "exeh.direction", FT_UINT16, BASE_HEX, VALS(exeh_direction_vals),
0x0, NULL, HFILL }},
{ &hf_exeh_unknown_32_33,
{ "Unknown_32", "exeh.unknown32", FT_BYTES, BASE_NONE, NULL,
0x0, NULL, HFILL }},
{ &hf_exeh_etype,
{ "Etype", "exeh.etype", FT_UINT16, BASE_HEX, NULL,
0x0, NULL, HFILL }},
{ &hf_exeh_etypedata,
{ "Etype data", "exeh.etypedata", FT_UINT16, BASE_HEX, NULL,
0x0, NULL, HFILL }},
{ &hf_exeh_etypelen,
{ "Length", "exeh.etypelen", FT_INT16, BASE_DEC, NULL,
0x0, "Bytes from 8100 to end of frame", HFILL }},
};
static gint *ett[] = {
&ett_exeh,
};
static ei_register_info ei[] = {
{ &ei_exeh_unexpected_value, { "exeh.unexpected_value", PI_PROTOCOL, PI_WARN, "Unexpected length", EXPFILL }},
{ &ei_exeh_unequal_ports, { "exeh.unequal_ports", PI_PROTOCOL, PI_WARN, "Unequal ports", EXPFILL }},
{ &ei_exeh_incoming_framesource, { "exeh.incoming_framesource", PI_PROTOCOL, PI_WARN, "Incoming framesource non-zero", EXPFILL }},
{ &ei_exeh_outgoing_framesource, { "exeh.outgoing_framesource", PI_PROTOCOL, PI_WARN, "Outgoing framesource unknown magic", EXPFILL }},
};
expert_module_t* expert_exeh;
proto_exeh = proto_register_protocol(PROTO_LONG_NAME, PROTO_SHORT_NAME, "exeh");
proto_register_field_array(proto_exeh, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
expert_exeh = expert_register_protocol(proto_exeh);
expert_register_field_array(expert_exeh, ei, array_length(ei));
}
void
proto_reg_handoff_exeh(void)
{
dissector_handle_t exeh_handle;
ethnofcs_handle = find_dissector_add_dependency("eth_withoutfcs", proto_exeh);
exeh_handle = create_dissector_handle(dissect_exeh, proto_exeh);
dissector_add_uint("ethertype", ETHERTYPE_EXEH, exeh_handle);
}
/*
* Editor modelines - https://www.wireshark.org/tools/modelines.html
*
* Local variables:
* c-basic-offset: 8
* tab-width: 8
* indent-tabs-mode: t
* End:
*
* vi: set shiftwidth=8 tabstop=8 noexpandtab:
* :indentSize=8:tabSize=8:noTabs=false:
*/
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