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wireshark/epan/dissectors/packet-mpls-y1711.c
Michael Mann 1e60d63c8c Create call_data_dissector() to call data dissector. 
This saves many dissectors the need to find the data dissector and store a handle to it.

There were also some that were finding it, but not using it.
For others this was the only reason for their handoff function, so it could be eliminated.

Change-Id: I5d3f951ee1daa3d30c060d21bd12bbc881a8027b
Reviewed-on: https://code.wireshark.org/review/14530
Petri-Dish: Michael Mann <mmann78@netscape.net>
Reviewed-by: Michael Mann <mmann78@netscape.net>
2016-03-20 17:38:03 +00:00

424 lines
16 KiB
C
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/* packet-mpls-y1711.c
* Routines for (old) ITU-T MPLS OAM: it conforms to ITU-T Y.1711 and RFC 3429
*
* Copyright 2006, 2011 _FF_
*
* Francesco Fondelli <francesco dot fondelli, gmail dot com>
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
/*
* FF: NOTES
*
* - this should dissect OAM pdus (identified by the MPLS_LABEL_OAM_ALERT = 14
* label) as described in ITU-T Y.1711 and RFC 3429.
*
* - this code used to be (since 2006) in packet-mpls.c ... nobody on this
* planet is using Y.1711 today (?), so thanks to the mpls subdissector
* table indexed by label value it has been moved here.
*/
#include "config.h"
#include <epan/packet.h>
#include <epan/expert.h>
#include "packet-mpls.h"
void proto_register_mpls_y1711(void);
void proto_reg_handoff_mpls_y1711(void);
static gint proto_mpls_y1711 = -1;
static int hf_mpls_y1711_function_type = -1;
/* static int hf_mpls_y1711_ttsi = -1; */
static int hf_mpls_y1711_frequency = -1;
static int hf_mpls_y1711_defect_type = -1;
static int hf_mpls_y1711_defect_location = -1;
static int hf_mpls_y1711_bip16 = -1;
/* Generated from convert_proto_tree_add_text.pl */
static int hf_mpls_y1711_lsr_id = -1;
static int hf_mpls_y1711_lsp_id = -1;
static gint ett_mpls_y1711 = -1;
/* Generated from convert_proto_tree_add_text.pl */
static expert_field ei_mpls_y1711_padding_not_ff = EI_INIT;
static expert_field ei_mpls_y1711_reserved_not_zero = EI_INIT;
static expert_field ei_mpls_y1711_ttsi_not_preset = EI_INIT;
static expert_field ei_mpls_y1711_minimum_payload = EI_INIT;
static expert_field ei_mpls_y1711_s_bit_not_one = EI_INIT;
static expert_field ei_mpls_y1711_no_OAM_alert_label = EI_INIT;
static expert_field ei_mpls_y1711_exp_bits_not_zero = EI_INIT;
static expert_field ei_mpls_y1711_ttl_not_one = EI_INIT;
static expert_field ei_mpls_y1711_padding_not_zero = EI_INIT;
static expert_field ei_mpls_y1711_unknown_pdu = EI_INIT;
static dissector_handle_t mpls_y1711_handle;
static const value_string y1711_function_type_vals[] = {
{0x00, "Reserved" },
{0x01, "CV (Connectivity Verification)" },
{0x02, "FDI (Forward Defect Indicator)" },
{0x03, "BDI (Backward Defect Indicator)" },
{0x04, "Reserved for Performance packets" },
{0x05, "Reserved for LB-Req (Loopback Request)" },
{0x06, "Reserved for LB-Rsp (Loopback Response)"},
{0x07, "FDD (Fast Failure Detection)" },
{0, NULL }
};
static const value_string y1711_frequency_vals[] = {
{0x00, "Reserved" },
{0x01, "10 ms" },
{0x02, "20 ms" },
{0x03, "50 ms (default value)"},
{0x04, "100 ms" },
{0x05, "200 ms" },
{0x06, "500 ms" },
/* 7-255 Reserved */
{0, NULL }
};
static const value_string y1711_defect_type_vals[] = {
{0x0000, "Reserved" },
{0x0101, "dServer" },
{0x0102, "dPeerME" },
{0x0201, "dLOCV" },
{0x0202, "dTTSI_Mismatch"},
{0x0203, "dTTSI_Mismerge"},
{0x0204, "dExcess" },
{0x02FF, "dUnknown" },
{0xFFFF, "Reserved" },
{0, NULL }
};
static int
dissect_mpls_y1711(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data)
{
struct mplsinfo *mplsinfo;
int offset = 0;
proto_tree *mpls_y1711_tree;
int functype;
tvbuff_t *data_tvb;
static const guint8 allone[] = { 0xff, 0xff };
static const guint8 allzero[] = { 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00 };
/* Reject the packet if data is NULL */
if (data == NULL)
return 0;
mplsinfo = (struct mplsinfo *)data;
functype = tvb_get_guint8(tvb, offset);
col_append_fstr(pinfo->cinfo, COL_INFO, " (Y.1711: %s)",
(functype == 0x01) ? "CV" :
(functype == 0x02) ? "FDI" :
(functype == 0x03) ? "BDI" :
(functype == 0x07) ? "FDD" :
"reserved/unknown");
/* sanity checks */
if (tvb_reported_length(tvb) < 44) {
/*
* ITU-T Y.1711, 5.3: PDUs must have a minimum payload length of
* 44 bytes
*/
proto_tree_add_expert(tree, pinfo, &ei_mpls_y1711_minimum_payload, tvb, offset, -1);
data_tvb = tvb_new_subset_remaining(tvb, offset);
call_data_dissector(data_tvb, pinfo, tree);
return tvb_reported_length(tvb);
}
mpls_y1711_tree = proto_tree_add_subtree(tree, tvb, offset, 44, ett_mpls_y1711, NULL, "Y.1711 OAM");
/* checks for exp, bos and ttl encoding */
if (mplsinfo->label != MPLS_LABEL_OAM_ALERT)
proto_tree_add_expert_format(mpls_y1711_tree, pinfo, &ei_mpls_y1711_no_OAM_alert_label, tvb, offset - 4, 3,
"Warning: Y.1711 but no OAM alert label (%d) ?!", MPLS_LABEL_OAM_ALERT);
if (mplsinfo->exp != 0)
proto_tree_add_expert(mpls_y1711_tree, pinfo, &ei_mpls_y1711_exp_bits_not_zero, tvb, offset - 2, 1);
if (mplsinfo->bos != 1)
proto_tree_add_expert(mpls_y1711_tree, pinfo, &ei_mpls_y1711_s_bit_not_one, tvb, offset - 2, 1);
if (mplsinfo->ttl != 1)
proto_tree_add_expert(mpls_y1711_tree, pinfo, &ei_mpls_y1711_ttl_not_one, tvb, offset - 1, 1);
/* starting dissection */
functype = tvb_get_guint8(tvb, offset);
proto_tree_add_item(mpls_y1711_tree, hf_mpls_y1711_function_type, tvb,
offset, 1,
ENC_LITTLE_ENDIAN);
offset++;
switch (functype) {
case 0x01: /* CV */
{
/* 3 octets reserved (all 0x00) */
if (tvb_memeql(tvb, offset, allzero, 3) == -1) {
proto_tree_add_expert(mpls_y1711_tree, pinfo, &ei_mpls_y1711_reserved_not_zero, tvb, offset, 3);
}
offset += 3;
/* ttsi (ipv4 flavor as in RFC 2373) */
if (tvb_memeql(tvb, offset, allzero, 10) == -1) {
proto_tree_add_expert(mpls_y1711_tree, pinfo, &ei_mpls_y1711_padding_not_zero, tvb, offset, 10);
}
offset += 10;
if (tvb_memeql(tvb, offset, allone, 2) == -1) {
proto_tree_add_expert(mpls_y1711_tree, pinfo, &ei_mpls_y1711_padding_not_ff, tvb, offset, 2);
}
offset += 2;
proto_tree_add_item(mpls_y1711_tree, hf_mpls_y1711_lsr_id, tvb, offset, 4, ENC_BIG_ENDIAN);
offset += 4;
proto_tree_add_item(mpls_y1711_tree, hf_mpls_y1711_lsp_id, tvb, offset, 4, ENC_BIG_ENDIAN);
offset += 4;
/* 18 octets of padding (all 0x00) */
if (tvb_memeql(tvb, offset, allzero, 18) == -1) {
proto_tree_add_expert(mpls_y1711_tree, pinfo, &ei_mpls_y1711_padding_not_zero, tvb, offset, 18);
}
offset += 18;
}
break;
case 0x02: /* FDI */
case 0x03: /* BDI */
{
/* 1 octets reserved (all 0x00) */
if (tvb_memeql(tvb, offset, allzero, 1) == -1) {
proto_tree_add_expert_format(mpls_y1711_tree, pinfo, &ei_mpls_y1711_reserved_not_zero, tvb, offset, 3,
"Error: this byte is reserved and must be 0x00");
}
offset++;
proto_tree_add_item(mpls_y1711_tree, hf_mpls_y1711_defect_type, tvb,
offset, 2,
ENC_LITTLE_ENDIAN);
offset += 2;
/*
* ttsi (ipv4 flavor as in RFC 2373) is optional if not used must
* be set to all 0x00
*/
if (tvb_memeql(tvb, offset, allzero, 20) == 0) {
proto_tree_add_expert(mpls_y1711_tree, pinfo, &ei_mpls_y1711_ttsi_not_preset, tvb, offset, 20);
offset += 20;
} else {
if (tvb_memeql(tvb, offset, allzero, 10) == -1) {
proto_tree_add_expert(mpls_y1711_tree, pinfo, &ei_mpls_y1711_padding_not_zero, tvb, offset, 10);
}
offset += 10;
if (tvb_memeql(tvb, offset, allone, 2) == -1) {
proto_tree_add_expert(mpls_y1711_tree, pinfo, &ei_mpls_y1711_padding_not_ff, tvb, offset, 2);
}
offset += 2;
proto_tree_add_item(mpls_y1711_tree, hf_mpls_y1711_lsr_id, tvb, offset, 4, ENC_BIG_ENDIAN);
offset += 4;
proto_tree_add_item(mpls_y1711_tree, hf_mpls_y1711_lsp_id, tvb, offset, 4, ENC_BIG_ENDIAN);
offset += 4;
}
/* defect location */
proto_tree_add_item(mpls_y1711_tree, hf_mpls_y1711_defect_location, tvb,
offset, 4,
ENC_LITTLE_ENDIAN);
offset += 4;
/* 14 octets of padding (all 0x00) */
if (tvb_memeql(tvb, offset, allzero, 14) == -1) {
proto_tree_add_expert(mpls_y1711_tree, pinfo, &ei_mpls_y1711_padding_not_zero, tvb, offset, 14);
}
offset += 14;
}
break;
case 0x07: /* FDD */
{
/* 3 octets reserved (all 0x00) */
if (tvb_memeql(tvb, offset, allzero, 3) == -1) {
proto_tree_add_expert(mpls_y1711_tree, pinfo, &ei_mpls_y1711_reserved_not_zero, tvb, offset, 3);
}
offset += 3;
/* ttsi (ipv4 flavor as in RFC 2373) */
if (tvb_memeql(tvb, offset, allzero, 10) == -1) {
proto_tree_add_expert(mpls_y1711_tree, pinfo, &ei_mpls_y1711_padding_not_zero, tvb, offset, 10);
}
offset += 10;
if (tvb_memeql(tvb, offset, allone, 2) == -1) {
proto_tree_add_expert(mpls_y1711_tree, pinfo, &ei_mpls_y1711_padding_not_ff, tvb, offset, 2);
}
offset += 2;
proto_tree_add_item(mpls_y1711_tree, hf_mpls_y1711_lsr_id, tvb, offset, 4, ENC_BIG_ENDIAN);
offset += 4;
proto_tree_add_item(mpls_y1711_tree, hf_mpls_y1711_lsp_id, tvb, offset, 4, ENC_BIG_ENDIAN);
offset += 4;
proto_tree_add_item(mpls_y1711_tree, hf_mpls_y1711_frequency, tvb,
offset, 1,
ENC_LITTLE_ENDIAN);
offset++;
/* 17 octets of padding (all 0x00) */
if (tvb_memeql(tvb, offset, allzero, 17) == -1) {
proto_tree_add_expert(mpls_y1711_tree, pinfo, &ei_mpls_y1711_padding_not_zero, tvb, offset, 17);
}
offset += 17;
}
break;
default:
proto_tree_add_expert(mpls_y1711_tree, pinfo, &ei_mpls_y1711_unknown_pdu, tvb, offset - 1, -1);
return offset;
}
/* BIP16 */
proto_tree_add_item(mpls_y1711_tree, hf_mpls_y1711_bip16, tvb, offset, 2,
ENC_LITTLE_ENDIAN);
offset += 2;
return offset;
}
void
proto_register_mpls_y1711(void)
{
static hf_register_info hf[] = {
{
&hf_mpls_y1711_function_type,
{
"Function Type", "mpls_y1711.function_type", FT_UINT8,
BASE_HEX, VALS(y1711_function_type_vals),
0x0, "Function Type codepoint", HFILL
}
},
#if 0
{
&hf_mpls_y1711_ttsi,
{
"Trail Termination Source Identifier",
"mpls_y1711.ttsi",
FT_UINT32, BASE_HEX, NULL, 0x0, NULL, HFILL
}
},
#endif
{
&hf_mpls_y1711_frequency,
{
"Frequency", "mpls_y1711.frequency", FT_UINT8,
BASE_HEX, VALS(y1711_frequency_vals), 0x0,
"Frequency of probe injection", HFILL
}
},
{
&hf_mpls_y1711_defect_type,
{
"Defect Type", "mpls_y1711.defect_type", FT_UINT16,
BASE_HEX, VALS(y1711_defect_type_vals), 0x0, NULL, HFILL
}
},
{
&hf_mpls_y1711_defect_location,
{
"Defect Location (AS)", "mpls_y1711.defect_location",
FT_UINT32, BASE_DEC, NULL, 0x0, "Defect Location", HFILL
}
},
{
&hf_mpls_y1711_bip16,
{
"BIP16", "mpls_y1711.bip16", FT_UINT16,
BASE_HEX, NULL, 0x0, NULL, HFILL
}
},
/* Generated from convert_proto_tree_add_text.pl */
{ &hf_mpls_y1711_lsr_id, { "LSR ID", "mpls_y1711.lsr_id", FT_IPv4, BASE_NONE, NULL, 0x0, NULL, HFILL }},
{ &hf_mpls_y1711_lsp_id, { "LSP ID", "mpls_y1711.lsp_id", FT_INT32, BASE_DEC, NULL, 0x0, NULL, HFILL }},
};
static gint *ett[] = {
&ett_mpls_y1711
};
static ei_register_info ei[] = {
/* Generated from convert_proto_tree_add_text.pl */
{ &ei_mpls_y1711_minimum_payload, { "mpls_y1711.minimum_payload", PI_MALFORMED, PI_ERROR, "Error: must have a minimum payload length of 44 bytes", EXPFILL }},
{ &ei_mpls_y1711_no_OAM_alert_label, { "mpls_y1711.no_OAM_alert_label", PI_PROTOCOL, PI_WARN, "Warning: Y.1711 but no OAM alert label (%d) ?!", EXPFILL }},
{ &ei_mpls_y1711_exp_bits_not_zero, { "mpls_y1711.exp_bits_not_0", PI_PROTOCOL, PI_WARN, "Warning: Exp bits should be 0 for Y.1711", EXPFILL }},
{ &ei_mpls_y1711_s_bit_not_one, { "mpls_y1711.s_bit_not_1", PI_PROTOCOL, PI_WARN, "Warning: S bit should be 1 for Y.1711", EXPFILL }},
{ &ei_mpls_y1711_ttl_not_one, { "mpls_y1711.ttl_not_1", PI_PROTOCOL, PI_WARN, "Warning: TTL should be 1 for Y.1711", EXPFILL }},
{ &ei_mpls_y1711_reserved_not_zero, { "mpls_y1711.reserved_not_zero", PI_PROTOCOL, PI_WARN, "Error: these bytes are reserved and must be 0x00", EXPFILL }},
{ &ei_mpls_y1711_padding_not_zero, { "mpls_y1711.padding_not_zero", PI_PROTOCOL, PI_WARN, "Error: these bytes are padding and must be 0x00", EXPFILL }},
{ &ei_mpls_y1711_padding_not_ff, { "mpls_y1711.padding_not_ff", PI_PROTOCOL, PI_WARN, "Error: these bytes are padding and must be 0xFF", EXPFILL }},
{ &ei_mpls_y1711_ttsi_not_preset, { "mpls_y1711.ttsi_not_preset", PI_PROTOCOL, PI_NOTE, "TTSI not preset (optional for FDI/BDI)", EXPFILL }},
{ &ei_mpls_y1711_unknown_pdu, { "mpls_y1711.unknown_pdu", PI_PROTOCOL, PI_WARN, "Unknown MPLS Y.1711 PDU", EXPFILL }},
};
expert_module_t* expert_mpls_y1711;
proto_mpls_y1711 =
proto_register_protocol("MPLS ITU-T Y.1711 OAM",
"MPLS ITU-T Y.1711 OAM",
"mpls_y1711");
proto_register_field_array(proto_mpls_y1711, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
expert_mpls_y1711 = expert_register_protocol(proto_mpls_y1711);
expert_register_field_array(expert_mpls_y1711, ei, array_length(ei));
register_dissector("mpls_y1711", dissect_mpls_y1711, proto_mpls_y1711);
}
void
proto_reg_handoff_mpls_y1711(void)
{
mpls_y1711_handle = find_dissector("mpls_y1711");
dissector_add_uint("mpls.label",
MPLS_LABEL_OAM_ALERT /* 14 */,
mpls_y1711_handle);
}
/*
* Editor modelines - http://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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