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/* packet-v5ef.c
* Routines for V5 envelope function frame disassembly
* Rolf Fiedler <rolf.fiedler@innoventif.de>
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
/*
* V5 bitstream over HDLC handling
*
* V5 references:
*
* ETS 300 324-1
* ETS 300 347-1
*/
#include "config.h"
#include <epan/packet.h>
#include <wiretap/wtap.h>
void proto_register_v5ef(void);
void proto_reg_handoff_v5ef(void);
static int proto_v5ef = -1;
static int hf_v5ef_direction = -1;
static int hf_v5ef_address = -1;
static int hf_v5ef_eah = -1;
static int hf_v5ef_ea1 = -1;
static int hf_v5ef_eal = -1;
static int hf_v5ef_ea2 = -1;
static gint ett_v5ef = -1;
static gint ett_v5ef_address = -1;
static dissector_handle_t v5dl_handle, lapd_phdr_handle, v5ef_handle;
/*
* Bits in the address field.
*/
#define V5EF_EAH 0xfc00 /* Service Access Point Identifier */
#define V5EF_EAH_SHIFT 10
#define V5EF_EA1 0x0100 /* First Address Extension bit */
#define V5EF_EAL 0x00fe /* Terminal Endpoint Identifier */
#define V5EF_EAL_SHIFT 1
#define V5EF_EA2 0x0001 /* Second Address Extension bit */
static const value_string v5ef_direction_vals[] = {
{ 0, "AN->LE"},
{ 1, "LE->AN"},
{ 0, NULL }
};
#define MAX_V5EF_PACKET_LEN 1024
static int
dissect_v5ef(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data)
{
struct isdn_phdr *isdn = (struct isdn_phdr *)data;
proto_tree *v5ef_tree, *addr_tree;
proto_item *v5ef_ti, *addr_ti;
int direction;
int v5ef_header_len;
guint16 addr, eah, eal, efaddr;
tvbuff_t *next_tvb;
const char *srcname = "src";
const char *dstname = "dst";
col_set_str(pinfo->cinfo, COL_PROTOCOL, "V5-EF");
col_clear(pinfo->cinfo, COL_INFO);
addr = tvb_get_ntohs(tvb, 0);
eah = (addr & V5EF_EAH) >> V5EF_EAH_SHIFT;
eal = (addr & V5EF_EAL) >> V5EF_EAL_SHIFT;
efaddr = (eah << 7) + eal;
v5ef_header_len = 2; /* addr */
direction = isdn->uton;
if (direction==0) {
srcname = "LE";
dstname = "AN";
} else if (direction > 0) {
srcname = "AN";
dstname = "LE";
}
col_set_str(pinfo->cinfo, COL_RES_DL_SRC, srcname);
col_set_str(pinfo->cinfo, COL_RES_DL_DST, dstname);
if (tree) {
proto_item *direction_ti;
v5ef_ti = proto_tree_add_item(tree, proto_v5ef, tvb, 0, -1,
ENC_NA);
v5ef_tree = proto_item_add_subtree(v5ef_ti, ett_v5ef);
/*
* Don't show the direction if we don't know it.
*/
if (direction != P2P_DIR_UNKNOWN) {
direction_ti = proto_tree_add_uint(v5ef_tree, hf_v5ef_direction,
tvb, 0, 0, direction);
proto_item_set_generated(direction_ti);
}
addr_ti = proto_tree_add_uint(v5ef_tree, hf_v5ef_address, tvb,
0, 2, addr);
addr_tree = proto_item_add_subtree(addr_ti, ett_v5ef_address);
proto_tree_add_uint(addr_tree, hf_v5ef_eah, tvb, 0, 1, addr);
proto_tree_add_uint(addr_tree, hf_v5ef_ea1, tvb, 0, 1, addr);
proto_tree_add_uint(addr_tree, hf_v5ef_eal, tvb, 1, 1, addr);
proto_tree_add_uint(addr_tree, hf_v5ef_ea2, tvb, 1, 1, addr);
}
else {
v5ef_ti = NULL;
v5ef_tree = NULL;
}
if (tree)
proto_item_set_len(v5ef_ti, v5ef_header_len);
next_tvb = tvb_new_subset_remaining(tvb, v5ef_header_len);
if (efaddr>8175)
call_dissector(v5dl_handle,next_tvb, pinfo, tree);
else
call_dissector_with_data(lapd_phdr_handle, next_tvb, pinfo, tree, isdn);
return tvb_captured_length(tvb);
}
void
proto_register_v5ef(void)
{
static hf_register_info hf[] = {
{ &hf_v5ef_direction,
{ "Direction", "v5ef.direction", FT_UINT8, BASE_DEC, VALS(v5ef_direction_vals), 0x0,
NULL, HFILL }},
{ &hf_v5ef_address,
{ "Address Field", "v5ef.address", FT_UINT16, BASE_HEX, NULL, 0x0,
"Address", HFILL }},
{ &hf_v5ef_eah,
{ "EAH", "v5ef.eah", FT_UINT16, BASE_DEC, NULL, V5EF_EAH,
"Envelope Address High Part", HFILL }},
{ &hf_v5ef_ea1,
{ "EA1", "v5ef.ea1", FT_UINT16, BASE_DEC, NULL, V5EF_EA1,
"First Address Extension bit", HFILL }},
{ &hf_v5ef_eal,
{ "EAL", "v5ef.eal", FT_UINT16, BASE_DEC, NULL, V5EF_EAL,
"Envelope Address Low Part", HFILL }},
{ &hf_v5ef_ea2,
{ "EA2", "v5ef.ea2", FT_UINT16, BASE_DEC, NULL, V5EF_EA2,
"Second Address Extension bit", HFILL }},
};
static gint *ett[] = {
&ett_v5ef,
&ett_v5ef_address,
};
proto_v5ef = proto_register_protocol("V5 Envelope Function (v5ef)",
"v5ef", "v5ef");
proto_register_field_array (proto_v5ef, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
v5ef_handle = register_dissector("v5ef", dissect_v5ef, proto_v5ef);
}
void
proto_reg_handoff_v5ef(void)
{
dissector_add_uint("wtap_encap", WTAP_ENCAP_V5_EF, v5ef_handle);
lapd_phdr_handle = find_dissector_add_dependency("lapd-phdr", proto_v5ef);
v5dl_handle = find_dissector_add_dependency("v5dl", proto_v5ef);
}
/*
* 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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