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/* packet-mpls-mac.c
*
* Routines for MPLS Media Access Control (MAC) Address Withdrawal over Static Pseudowire.
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "config.h"
#include <epan/packet.h>
#include "packet-mpls.h"
void proto_register_mpls_mac(void);
void proto_reg_handoff_mpls_mac(void);
static dissector_handle_t mpls_mac_handle;
static int proto_mpls_mac;
static int ett_mpls_mac;
static int ett_mpls_mac_flags;
static int ett_mpls_mac_tlv;
static int hf_mpls_mac_reserved;
static int hf_mpls_mac_tlv_length_total;
static int hf_mpls_mac_flags;
static int hf_mpls_mac_flags_a;
static int hf_mpls_mac_flags_r;
static int hf_mpls_mac_flags_reserved;
static int hf_mpls_mac_tlv;
static int hf_mpls_mac_tlv_res;
static int hf_mpls_mac_tlv_type;
static int hf_mpls_mac_tlv_length;
static int hf_mpls_mac_tlv_value;
static int hf_mpls_mac_tlv_sequence_number;
static int * const mpls_mac_flags[] = {
&hf_mpls_mac_flags_a,
&hf_mpls_mac_flags_r,
&hf_mpls_mac_flags_reserved,
NULL
};
static int
dissect_mpls_mac(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{
proto_item *ti;
proto_tree *mac_tree;
uint32_t offset = 0, tlv_length, offset_end;
col_set_str(pinfo->cinfo, COL_PROTOCOL, "MPLS-MAC");
col_clear(pinfo->cinfo, COL_INFO);
ti = proto_tree_add_item(tree, proto_mpls_mac, tvb, 0, -1, ENC_NA);
mac_tree = proto_item_add_subtree(ti, ett_mpls_mac);
/* Reserved */
proto_tree_add_item(mac_tree, hf_mpls_mac_reserved, tvb, offset, 2, ENC_NA);
offset += 2;
/* TLV length */
proto_tree_add_item_ret_uint(mac_tree, hf_mpls_mac_tlv_length_total, tvb, offset, 1, ENC_BIG_ENDIAN, &tlv_length);
offset += 1;
/* Flags */
proto_tree_add_bitmask(mac_tree, tvb, offset, hf_mpls_mac_flags,
ett_mpls_mac_flags,
mpls_mac_flags,
ENC_BIG_ENDIAN);
offset += 1;
offset_end = offset + tlv_length;
while(offset < offset_end){
uint32_t type, length;
proto_tree *tlv_tree;
ti = proto_tree_add_item(mac_tree, hf_mpls_mac_tlv, tvb, offset, 4, ENC_NA);
tlv_tree = proto_item_add_subtree(ti, ett_mpls_mac_tlv);
/* res(erved) */
proto_tree_add_item(tlv_tree, hf_mpls_mac_tlv_res, tvb, offset, 2, ENC_BIG_ENDIAN);
/* TLV Type */
proto_tree_add_item_ret_uint(tlv_tree, hf_mpls_mac_tlv_type, tvb, offset, 2, ENC_BIG_ENDIAN, &type);
offset += 2;
/* TLV Length */
proto_tree_add_item_ret_uint(tlv_tree, hf_mpls_mac_tlv_length, tvb, offset, 2, ENC_BIG_ENDIAN, &length);
offset += 2;
proto_item_set_len(ti, 2+2+length);
proto_item_append_text(ti, " (t=0x%x, l=%u)", type, length);
/* TLV Value */
proto_tree_add_item(tlv_tree, hf_mpls_mac_tlv_value, tvb, offset, length, ENC_NA);
switch(type){
case 0x0001:
proto_tree_add_item(tlv_tree, hf_mpls_mac_tlv_sequence_number, tvb, offset, 4, ENC_BIG_ENDIAN);
offset += 4;
break;
default:
offset += length;
break;
}
}
return offset;
}
void
proto_register_mpls_mac(void)
{
static hf_register_info hf[] = {
{
&hf_mpls_mac_reserved,
{
"Reserved", "mpls_mac.reserved",
FT_BYTES, BASE_NONE, NULL, 0x0,
NULL, HFILL
}
},
{
&hf_mpls_mac_tlv_length_total,
{
"TLV Length (Total)", "mpls_mac.tlv_length_total",
FT_UINT8, BASE_DEC, NULL, 0x0,
NULL, HFILL
}
},
{
&hf_mpls_mac_flags,
{
"Flags", "mpls_mac.flags",
FT_UINT8, BASE_HEX, NULL, 0x0,
NULL, HFILL
}
},
{
&hf_mpls_mac_flags_a,
{
"Flags A", "mpls_mac.flags.a",
FT_BOOLEAN, 8, NULL, 0x80,
"set by a receiver to acknowledge receipt and processing of a MAC Address Withdraw OAM Message", HFILL
}
},
{
&hf_mpls_mac_flags_r,
{
"Flags R", "mpls_mac.flags.r",
FT_BOOLEAN, 8, NULL, 0x40,
"Set to indicate if the sender is requesting reset of the sequence numbers", HFILL
}
},
{
&hf_mpls_mac_flags_reserved,
{
"Flags Reserved", "mpls_mac.flags.reserved",
FT_UINT8, BASE_HEX, NULL, 0x3F,
NULL, HFILL
}
},
{
&hf_mpls_mac_tlv,
{
"TLV", "mpls_mac.tlv",
FT_NONE, BASE_NONE, NULL, 0x0,
NULL, HFILL
}
},
{
&hf_mpls_mac_tlv_res,
{
"Res(erved)", "mpls_mac.tlv.res",
FT_UINT16, BASE_HEX, NULL, 0xC000,
NULL, HFILL
}
},
{
&hf_mpls_mac_tlv_type,
{
"TLV Type", "mpls_mac.tlv.type",
FT_UINT16, BASE_HEX, NULL, 0x3FFF,
NULL, HFILL
}
},
{
&hf_mpls_mac_tlv_length,
{
"TLV Length", "mpls_mac.tlv.length",
FT_UINT16, BASE_DEC, NULL, 0x0,
NULL, HFILL
}
},
{
&hf_mpls_mac_tlv_value,
{
"TLV Value", "mpls_mac.tlv.value",
FT_BYTES, BASE_NONE, NULL, 0x0,
NULL, HFILL
}
},
{
&hf_mpls_mac_tlv_sequence_number,
{
"Sequence Number", "mpls_mac.tlv.sequence_number",
FT_UINT32, BASE_DEC, NULL, 0x0,
NULL, HFILL
}
},
};
static int *ett[] = {
&ett_mpls_mac,
&ett_mpls_mac_flags,
&ett_mpls_mac_tlv,
};
proto_mpls_mac =
proto_register_protocol("Media Access Control (MAC) Address Withdrawal over Static Pseudowire", "MPLS-MAC", "mpls_mac");
proto_register_field_array(proto_mpls_mac, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
mpls_mac_handle = register_dissector("mpls_mac", dissect_mpls_mac, proto_mpls_mac);
}
void
proto_reg_handoff_mpls_mac(void)
{
dissector_add_uint("pwach.channel_type", PW_ACH_TYPE_MAC, mpls_mac_handle);
}
/*
* 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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