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/* packet-hp-erm.c
* Routines for the disassembly of HP ProCurve encapsulated remote mirroring frames
* (Adapted from packet-cisco-erspan.c and packet-vlan.c)
*
* Copyright 2010 2012 William Meier <wmeier [AT] newsguy.com>,
* Zdravko Velinov <z.velinov [AT] vkv5.com>
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
/*
* For some information on HP Procurve encapsulated remote mirroring see
* "Traffic Mirroring" in Appendix B of the HP manual
* "Management and Configuration Guide for the ProCurve Series
* 3500, 3500yl, 5400zl, 6200yl, 6600, and 8200zl Switches (September 2009)"
*
* Format:
* The above manual indicates that the encapsulatedmirrored frame is transmitted
* on the network as a [UDP] packet which has 54 bytes preceding the mirrored frame.
* Examining a sample capture shows that this means that the data payload
* of the UDP packet consists of a 12 byte "header" followed by the
* bytes of the mirrored frame.
*
* After some additional tests, which involved injecting 802.1Q frames with
* different priorities and VLAN identifiers. It was determined that the HP
* ERM header has a part inside its header that closely resembles the 802.1Q
* header. The only difference is the priority numbering.
*/
#include "config.h"
#include <epan/packet.h>
void proto_register_hp_erm(void);
void proto_reg_handoff_hp_erm(void);
static dissector_handle_t hp_erm_handle;
#define PROTO_SHORT_NAME "HP_ERM"
#define PROTO_LONG_NAME "HP encapsulated remote mirroring"
static int proto_hp_erm = -1;
static gint ett_hp_erm = -1;
static int hf_hp_erm_unknown1 = -1;
static int hf_hp_erm_unknown2 = -1;
static int hf_hp_erm_unknown3 = -1;
static int hf_hp_erm_priority = -1;
static int hf_hp_erm_cfi = -1;
static int hf_hp_erm_vlan = -1;
static int hf_hp_erm_is_tagged = -1;
static const value_string hp_erm_pri_vals[] = {
{ 0, "Background" },
{ 1, "Spare" },
{ 2, "Best Effort (default)" },
{ 3, "Excellent Effort" },
{ 4, "Controlled Load" },
{ 5, "Video, < 100ms latency and jitter" },
{ 6, "Voice, < 10ms latency and jitter" },
{ 7, "Network Control" },
{ 0, NULL }
};
static const true_false_string hp_erm_canonical = { "Non-canonical", "Canonical" };
static dissector_handle_t eth_withoutfcs_handle;
static int
dissect_hp_erm(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{
proto_item *ti;
proto_tree *hp_erm_tree;
tvbuff_t *eth_tvb;
int offset = 0;
int * const flags[] = {
&hf_hp_erm_unknown2,
&hf_hp_erm_priority,
&hf_hp_erm_cfi,
&hf_hp_erm_vlan,
&hf_hp_erm_is_tagged,
&hf_hp_erm_unknown3,
NULL
};
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_hp_erm, tvb, 0, -1, ENC_NA);
hp_erm_tree = proto_item_add_subtree(ti, ett_hp_erm);
proto_tree_add_item(hp_erm_tree, hf_hp_erm_unknown1, tvb, offset, 8, ENC_NA);
offset += 8;
proto_tree_add_bitmask_list(hp_erm_tree, tvb, offset, 4, flags, ENC_BIG_ENDIAN);
offset += 4;
eth_tvb = tvb_new_subset_remaining(tvb, offset);
call_dissector(eth_withoutfcs_handle, eth_tvb, pinfo, tree);
return tvb_captured_length(tvb);
}
void
proto_register_hp_erm(void)
{
static hf_register_info hf[] = {
{ &hf_hp_erm_unknown1,
{ "Unknown1", "hp_erm.unknown1", FT_BYTES, BASE_NONE, NULL,
0x0, NULL, HFILL }},
{ &hf_hp_erm_unknown2,
{ "Unknown2", "hp_erm.unknown2", FT_UINT32, BASE_DEC, NULL,
0xFF000000, NULL, HFILL }},
{ &hf_hp_erm_priority,
{ "Priority", "hp_erm.priority", FT_UINT32, BASE_DEC, VALS(hp_erm_pri_vals),
0x00E00000, NULL, HFILL }},
{ &hf_hp_erm_cfi,
{ "CFI", "hp_erm.cfi", FT_BOOLEAN, 32, TFS(&hp_erm_canonical),
0x00100000, NULL, HFILL }},
{ &hf_hp_erm_vlan,
{ "Vlan", "hp_erm.vlan", FT_UINT32, BASE_DEC, NULL,
0x000FFF00, NULL, HFILL }},
{ &hf_hp_erm_is_tagged,
{ "Is_Tagged", "hp_erm.is_tagged", FT_BOOLEAN, 32, TFS(&tfs_yes_no),
0x00000080, NULL, HFILL }},
{ &hf_hp_erm_unknown3,
{ "Unknown3", "hp_erm.unknown3", FT_UINT32, BASE_DEC, NULL,
0x0000007F, NULL, HFILL }}
};
static gint *ett[] = {
&ett_hp_erm,
};
proto_hp_erm = proto_register_protocol(PROTO_LONG_NAME, PROTO_SHORT_NAME, "hp_erm");
proto_register_field_array(proto_hp_erm, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
hp_erm_handle = register_dissector("hp_erm", dissect_hp_erm, proto_hp_erm);
}
void
proto_reg_handoff_hp_erm(void)
{
eth_withoutfcs_handle = find_dissector_add_dependency("eth_withoutfcs", proto_hp_erm);
dissector_add_for_decode_as_with_preference("udp.port", hp_erm_handle);
}
/*
* Editor modelines
*
* Local Variables:
* c-basic-offset: 4
* tab-width: 8
* indent-tabs-mode: nil
* End:
*
* ex: set shiftwidth=4 tabstop=8 expandtab:
* :indentSize=4:tabSize=8:noTabs=true:
*/
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