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wireshark/epan/dissectors/packet-sdh.c
Michael Mann f4b0abc729 Dissectors don't need a journey of self discovery. 
They already know who they are when they register themselves.  Saving the
handle then to avoid finding it later.
Not sure if this will increase unnecessary register_dissector functions
(instead of using create_dissector_handle in proto_reg_handoff function)
when other dissectors copy/paste, but it should make startup time
a few microseconds better.

Change-Id: I3839be791b32b84887ac51a6a65fb5733e9f1f43
Reviewed-on: https://code.wireshark.org/review/19481
Petri-Dish: Michael Mann <mmann78@netscape.net>
Tested-by: Petri Dish Buildbot <buildbot-no-reply@wireshark.org>
Reviewed-by: Anders Broman <a.broman58@gmail.com>
2016-12-31 07:31:42 +00:00

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/* packet-sdh.c
* Routines for SDH/SONET encapsulation dissection
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 - 2012 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.
*/
#include "config.h"
#include <epan/packet.h>
#include <epan/prefs.h>
#include <wiretap/wtap.h>
#include "packet-erf.h"
#define COLUMNS 270
#define EXT_HDR_TYPE_RAW_LINK 5
void proto_register_sdh(void);
void proto_reg_handoff_sdh(void);
static int proto_sdh = -1;
static gint ett_sdh = -1;
static int hf_sdh_a1 = -1;
static int hf_sdh_a2 = -1;
static int hf_sdh_j0 = -1;
static int hf_sdh_b1 = -1;
static int hf_sdh_e1 = -1;
static int hf_sdh_f1 = -1;
static int hf_sdh_d1 = -1;
static int hf_sdh_d2 = -1;
static int hf_sdh_d3 = -1;
static int hf_sdh_au = -1;
static int hf_sdh_b2 = -1;
static int hf_sdh_k1 = -1;
static int hf_sdh_k2 = -1;
static int hf_sdh_d4 = -1;
static int hf_sdh_d5 = -1;
static int hf_sdh_d6 = -1;
static int hf_sdh_d7 = -1;
static int hf_sdh_d8 = -1;
static int hf_sdh_d9 = -1;
static int hf_sdh_d10 = -1;
static int hf_sdh_d11 = -1;
static int hf_sdh_d12 = -1;
static int hf_sdh_s1 = -1;
static int hf_sdh_m1 = -1;
static int hf_sdh_e2 = -1;
static int hf_sdh_h1 = -1;
static int hf_sdh_h2 = -1;
static int hf_sdh_j1 = -1;
static dissector_handle_t sdh_handle;
static gint sdh_data_rate = 1;
static const enum_val_t data_rates[] = {
{"Attempt to guess", "Attempt to guess", -1},
{"OC-3", "OC-3", 1},
{"OC-12", "OC-12", 4},
{"OC-24", "OC-24", 8},
{"OC-48", "OC-48", 16},
{NULL, NULL, -1}
};
const value_string sdh_s1_vals[] = {
{ 0, "Quality unknown" },
{ 1, "Reserved" },
{ 2, "Rec G.811" },
{ 3, "Reserved" },
{ 4, "SSU-A" },
{ 5, "Reserved" },
{ 6, "Reserved" },
{ 7, "Reserved" },
{ 8, "SSU-B" },
{ 9, "Reserved" },
{ 10, "Reserved" },
{ 11, "SDH Equipment Source" },
{ 12, "Reserved" },
{ 13, "Reserved" },
{ 14, "Reserved" },
{ 15, "do not use for sync" },
{ 0, NULL }
};
static int
get_sdh_level(tvbuff_t *tvb, packet_info *pinfo)
{
guint64 *hdr = NULL;
/*data rate has been set in the SDH options*/
if(sdh_data_rate != -1) return sdh_data_rate;
/*ERF specifies data rate*/
hdr = erf_get_ehdr(pinfo, EXT_HDR_TYPE_RAW_LINK, NULL);
if (hdr != NULL){
switch((*hdr & 0xff00) >> 8){
case 1: /*OC-3*/
return 1;
case 2: /*OC-12*/
return 4;
case 3: /*OC-48*/
return 16;
default: /*drop through and try the next method*/
;
}
}
/*returns the multiplier for each data level*/
switch(tvb_reported_length(tvb)){
case 2430: /*OC-3*/
return 1;
case 9720: /*OC-12*/
return 4;
case 19440: /*OC-24*/
return 8;
case 38880: /*OC-48*/
return 16;
}
return 1;
}
static int
dissect_sdh(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{
col_set_str(pinfo->cinfo, COL_PROTOCOL, "SDH");
col_clear(pinfo->cinfo,COL_INFO);
if (tree) {
proto_tree *sdh_tree;
proto_item *sdh_item;
int level = get_sdh_level(tvb, pinfo);
guint8 h1;
guint8 h2;
guint16 au;
int auoffset;
sdh_item = proto_tree_add_protocol_format(tree, proto_sdh, tvb, 0, -1, "SDH");
sdh_tree = proto_item_add_subtree(sdh_item, ett_sdh);
h1 = tvb_get_guint8(tvb, 0*level+(3*level*COLUMNS));
h2 = tvb_get_guint8(tvb, 3*level+(3*level*COLUMNS));
au = (h2 | ((0x03 & h1) << 8));
proto_tree_add_item(sdh_tree, hf_sdh_a1, tvb, 0*level, 3*level, ENC_NA);
proto_tree_add_item(sdh_tree, hf_sdh_a2, tvb, 3*level, 3*level, ENC_NA);
proto_tree_add_item(sdh_tree, hf_sdh_j0, tvb, 6*level, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(sdh_tree, hf_sdh_b1, tvb, 0*level+(1*level*COLUMNS), 1, ENC_BIG_ENDIAN);
proto_tree_add_item(sdh_tree, hf_sdh_e1, tvb, 3*level+(1*level*COLUMNS), 1, ENC_BIG_ENDIAN);
proto_tree_add_item(sdh_tree, hf_sdh_f1, tvb, 6*level+(1*level*COLUMNS), 1, ENC_BIG_ENDIAN);
proto_tree_add_item(sdh_tree, hf_sdh_d1, tvb, 0*level+(2*level*COLUMNS), 1, ENC_BIG_ENDIAN);
proto_tree_add_item(sdh_tree, hf_sdh_d2, tvb, 3*level+(2*level*COLUMNS), 1, ENC_BIG_ENDIAN);
proto_tree_add_item(sdh_tree, hf_sdh_d3, tvb, 6*level+(2*level*COLUMNS), 1, ENC_BIG_ENDIAN);
proto_tree_add_item(sdh_tree, hf_sdh_h1, tvb, 0*level+(3*level*COLUMNS), 1, ENC_BIG_ENDIAN);
proto_tree_add_item(sdh_tree, hf_sdh_h2, tvb, 3*level+(3*level*COLUMNS), 1, ENC_BIG_ENDIAN);
proto_tree_add_uint(sdh_tree, hf_sdh_au, tvb, 0*level+(3*level*COLUMNS), 3*level+1, au);
proto_tree_add_item(sdh_tree, hf_sdh_b2, tvb, 0*level+(4*level*COLUMNS), 3*level, ENC_NA);
proto_tree_add_item(sdh_tree, hf_sdh_k1, tvb, 3*level+(4*level*COLUMNS), 1, ENC_BIG_ENDIAN);
proto_tree_add_item(sdh_tree, hf_sdh_k2, tvb, 6*level+(4*level*COLUMNS), 1, ENC_BIG_ENDIAN);
proto_tree_add_item(sdh_tree, hf_sdh_d4, tvb, 0*level+(5*level*COLUMNS), 1, ENC_BIG_ENDIAN);
proto_tree_add_item(sdh_tree, hf_sdh_d5, tvb, 3*level+(5*level*COLUMNS), 1, ENC_BIG_ENDIAN);
proto_tree_add_item(sdh_tree, hf_sdh_d6, tvb, 6*level+(5*level*COLUMNS), 1, ENC_BIG_ENDIAN);
proto_tree_add_item(sdh_tree, hf_sdh_d7, tvb, 0*level+(6*level*COLUMNS), 1, ENC_BIG_ENDIAN);
proto_tree_add_item(sdh_tree, hf_sdh_d8, tvb, 3*level+(6*level*COLUMNS), 1, ENC_BIG_ENDIAN);
proto_tree_add_item(sdh_tree, hf_sdh_d9, tvb, 6*level+(6*level*COLUMNS), 1, ENC_BIG_ENDIAN);
proto_tree_add_item(sdh_tree, hf_sdh_d10, tvb, 0*level+(7*level*COLUMNS), 1, ENC_BIG_ENDIAN);
proto_tree_add_item(sdh_tree, hf_sdh_d11, tvb, 3*level+(7*level*COLUMNS), 1, ENC_BIG_ENDIAN);
proto_tree_add_item(sdh_tree, hf_sdh_d12, tvb, 6*level+(7*level*COLUMNS), 1, ENC_BIG_ENDIAN);
proto_tree_add_item(sdh_tree, hf_sdh_s1, tvb, 0*level+(8*level*COLUMNS), 1, ENC_BIG_ENDIAN);
proto_tree_add_item(sdh_tree, hf_sdh_m1, tvb, 3*level+2+(8*level*COLUMNS), 1, ENC_BIG_ENDIAN);
proto_tree_add_item(sdh_tree, hf_sdh_e2, tvb, 6*level+(8*level*COLUMNS), 1, ENC_BIG_ENDIAN);
/*XXX: POH that au points to may not be in the same frame. Also wrong on pointer justification*/
/*calculate start of SPE by wrapping AU pointer*/
auoffset = (((9 + 3*COLUMNS) /*start after H3*/ + au*3 + 9*(au/87) /*add extra SOH rows to offset*/) * level) % (COLUMNS*9*level);
proto_tree_add_item(sdh_tree, hf_sdh_j1, tvb, auoffset, 1, ENC_BIG_ENDIAN);
}
return tvb_captured_length(tvb);
}
void
proto_register_sdh(void)
{
static hf_register_info hf[] = {
{ &hf_sdh_a1,
{ "A1", "sdh.a1", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }},
{ &hf_sdh_a2,
{ "A2", "sdh.a2", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }},
{ &hf_sdh_j0,
{ "J0", "sdh.j0", FT_UINT8, BASE_HEX, NULL, 0x0, NULL, HFILL }},
{ &hf_sdh_b1,
{ "B1", "sdh.b1", FT_UINT8, BASE_HEX, NULL, 0x0, NULL, HFILL }},
{ &hf_sdh_e1,
{ "E1", "sdh.e1", FT_UINT8, BASE_HEX, NULL, 0x0, NULL, HFILL }},
{ &hf_sdh_f1,
{ "F1", "sdh.f1", FT_UINT8, BASE_HEX, NULL, 0x0, NULL, HFILL }},
{ &hf_sdh_d1,
{ "D1", "sdh.d1", FT_UINT8, BASE_HEX, NULL, 0x0, NULL, HFILL }},
{ &hf_sdh_d2,
{ "D2", "sdh.d2", FT_UINT8, BASE_HEX, NULL, 0x0, NULL, HFILL }},
{ &hf_sdh_d3,
{ "D3", "sdh.d3", FT_UINT8, BASE_HEX, NULL, 0x0, NULL, HFILL }},
{ &hf_sdh_au,
{ "AU", "sdh.au", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL }},
{ &hf_sdh_b2,
{ "B2", "sdh.b2", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }},
{ &hf_sdh_k1,
{ "K1", "sdh.k1", FT_UINT8, BASE_HEX, NULL, 0x0, NULL, HFILL }},
{ &hf_sdh_k2,
{ "K2", "sdh.k2", FT_UINT8, BASE_HEX, NULL, 0x0, NULL, HFILL }},
{ &hf_sdh_d4,
{ "D4", "sdh.d4", FT_UINT8, BASE_HEX, NULL, 0x0, NULL, HFILL }},
{ &hf_sdh_d5,
{ "D5", "sdh.d5", FT_UINT8, BASE_HEX, NULL, 0x0, NULL, HFILL }},
{ &hf_sdh_d6,
{ "D6", "sdh.d6", FT_UINT8, BASE_HEX, NULL, 0x0, NULL, HFILL }},
{ &hf_sdh_d7,
{ "D7", "sdh.d7", FT_UINT8, BASE_HEX, NULL, 0x0, NULL, HFILL }},
{ &hf_sdh_d8,
{ "D8", "sdh.d8", FT_UINT8, BASE_HEX, NULL, 0x0, NULL, HFILL }},
{ &hf_sdh_d9,
{ "D9", "sdh.d9", FT_UINT8, BASE_HEX, NULL, 0x0, NULL, HFILL }},
{ &hf_sdh_d10,
{ "D10", "sdh.d10", FT_UINT8, BASE_HEX, NULL, 0x0, NULL, HFILL }},
{ &hf_sdh_d11,
{ "D11", "sdh.d11", FT_UINT8, BASE_HEX, NULL, 0x0, NULL, HFILL }},
{ &hf_sdh_d12,
{ "D12", "sdh.d12", FT_UINT8, BASE_HEX, NULL, 0x0, NULL, HFILL }},
{ &hf_sdh_s1,
{ "S1", "sdh.s1", FT_UINT8, BASE_HEX, VALS(sdh_s1_vals), 0x0, NULL, HFILL }},
{ &hf_sdh_m1,
{ "M1", "sdh.m1", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL }},
{ &hf_sdh_e2,
{ "E2", "sdh.e2", FT_UINT8, BASE_HEX, NULL, 0x0, NULL, HFILL }},
{ &hf_sdh_j1,
{ "J1", "sdh.j1", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL }},
{ &hf_sdh_h1,
{ "H1", "sdh.h1", FT_UINT8, BASE_HEX, NULL, 0x0, NULL, HFILL }},
{ &hf_sdh_h2,
{ "H2", "sdh.h2", FT_UINT8, BASE_HEX, NULL, 0x0, NULL, HFILL }},
};
static gint *ett[] = {
&ett_sdh,
};
module_t *sdh_module;
proto_sdh = proto_register_protocol("SDH/SONET Protocol", "SDH", "sdh");
proto_register_field_array(proto_sdh, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
sdh_module = prefs_register_protocol(proto_sdh, NULL);
prefs_register_enum_preference(sdh_module, "data.rate",
"Data rate",
"Data rate",
&sdh_data_rate, data_rates, ENC_BIG_ENDIAN);
sdh_handle = register_dissector("sdh", dissect_sdh, proto_sdh);
}
void
proto_reg_handoff_sdh(void)
{
dissector_add_uint("wtap_encap", WTAP_ENCAP_SDH, sdh_handle);
}
/*
* Editor modelines - http://www.wireshark.org/tools/modelines.html
*
* Local Variables:
* c-basic-offset: 2
* tab-width: 8
* indent-tabs-mode: nil
* End:
*
* ex: set shiftwidth=2 tabstop=8 expandtab:
* :indentSize=2:tabSize=8:noTabs=true:
*/
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