diff options
Diffstat (limited to 'packet-lapd.c')
-rw-r--r-- | packet-lapd.c | 296 |
1 files changed, 0 insertions, 296 deletions
diff --git a/packet-lapd.c b/packet-lapd.c deleted file mode 100644 index d766047ef8..0000000000 --- a/packet-lapd.c +++ /dev/null @@ -1,296 +0,0 @@ -/* packet-lapd.c - * Routines for LAPD frame disassembly - * Gilbert Ramirez <gram@alumni.rice.edu> - * - * $Id$ - * - * Ethereal - Network traffic analyzer - * By Gerald Combs <gerald@ethereal.com> - * Copyright 1998 - * - * 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. - */ - -#ifdef HAVE_CONFIG_H -# include "config.h" -#endif - -#include <stdio.h> -#include <glib.h> -#include <string.h> -#include <epan/packet.h> -#include "xdlc.h" - -#include "lapd_sapi.h" - -/* ISDN/LAPD references: - * - * http://www.cisco.com/univercd/cc/td/doc/cisintwk/ito_doc/isdn.htm - * http://www.ece.wpi.edu/courses/ee535/hwk11cd95/agrebe/agrebe.html - * http://www.acacia-net.com/Clarinet/Protocol/q9213o84.htm - */ - -static int proto_lapd = -1; -static int hf_lapd_address = -1; -static int hf_lapd_sapi = -1; -static int hf_lapd_cr = -1; -static int hf_lapd_ea1 = -1; -static int hf_lapd_tei = -1; -static int hf_lapd_ea2 = -1; -static int hf_lapd_control = -1; -static int hf_lapd_n_r = -1; -static int hf_lapd_n_s = -1; -static int hf_lapd_p = -1; -static int hf_lapd_p_ext = -1; -static int hf_lapd_f = -1; -static int hf_lapd_f_ext = -1; -static int hf_lapd_s_ftype = -1; -static int hf_lapd_u_modifier_cmd = -1; -static int hf_lapd_u_modifier_resp = -1; -static int hf_lapd_ftype_i = -1; -static int hf_lapd_ftype_s_u = -1; -static int hf_lapd_ftype_s_u_ext = -1; - -static gint ett_lapd = -1; -static gint ett_lapd_address = -1; -static gint ett_lapd_control = -1; - -static dissector_table_t lapd_sapi_dissector_table; - -static dissector_handle_t data_handle; -static dissector_handle_t tei_handle; - -/* - * Bits in the address field. - */ -#define LAPD_SAPI 0xfc00 /* Service Access Point Identifier */ -#define LAPD_SAPI_SHIFT 10 -#define LAPD_CR 0x0200 /* Command/Response bit */ -#define LAPD_EA1 0x0100 /* First Address Extension bit */ -#define LAPD_TEI 0x00fe /* Terminal Endpoint Identifier */ -#define LAPD_EA2 0x0001 /* Second Address Extension bit */ - -static const value_string lapd_sapi_vals[] = { - { LAPD_SAPI_Q931, "Q.931 Call control procedure" }, - { LAPD_SAPI_PM_Q931, "Packet mode Q.931 Call control procedure" }, - { LAPD_SAPI_X25, "X.25 Level 3 procedures" }, - { LAPD_SAPI_L2, "Layer 2 management procedures" }, - { 0, NULL } -}; - -/* Used only for U frames */ -static const xdlc_cf_items lapd_cf_items = { - NULL, - NULL, - &hf_lapd_p, - &hf_lapd_f, - NULL, - &hf_lapd_u_modifier_cmd, - &hf_lapd_u_modifier_resp, - NULL, - &hf_lapd_ftype_s_u -}; - -/* Used only for I and S frames */ -static const xdlc_cf_items lapd_cf_items_ext = { - &hf_lapd_n_r, - &hf_lapd_n_s, - &hf_lapd_p_ext, - &hf_lapd_f_ext, - &hf_lapd_s_ftype, - NULL, - NULL, - &hf_lapd_ftype_i, - &hf_lapd_ftype_s_u_ext -}; - -static void -dissect_lapd(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree) -{ - proto_tree *lapd_tree, *addr_tree; - proto_item *lapd_ti, *addr_ti; - guint16 control; - int lapd_header_len; - guint16 address, cr, sapi; - gboolean is_response; - tvbuff_t *next_tvb; - - if (check_col(pinfo->cinfo, COL_PROTOCOL)) - col_set_str(pinfo->cinfo, COL_PROTOCOL, "LAPD"); - if (check_col(pinfo->cinfo, COL_INFO)) - col_clear(pinfo->cinfo, COL_INFO); - - address = tvb_get_ntohs(tvb, 0); - cr = address & LAPD_CR; - sapi = (address & LAPD_SAPI) >> LAPD_SAPI_SHIFT; - lapd_header_len = 2; /* address */ - - if (pinfo->p2p_dir == P2P_DIR_SENT) { - is_response = cr ? TRUE : FALSE; - if(check_col(pinfo->cinfo, COL_RES_DL_DST)) - col_set_str(pinfo->cinfo, COL_RES_DL_DST, "Network"); - if(check_col(pinfo->cinfo, COL_RES_DL_SRC)) - col_set_str(pinfo->cinfo, COL_RES_DL_SRC, "User"); - } - else { - /* XXX - what if the direction is unknown? */ - is_response = cr ? FALSE : TRUE; - if(check_col(pinfo->cinfo, COL_RES_DL_DST)) - col_set_str(pinfo->cinfo, COL_RES_DL_DST, "User"); - if(check_col(pinfo->cinfo, COL_RES_DL_SRC)) - col_set_str(pinfo->cinfo, COL_RES_DL_SRC, "Network"); - } - - if (tree) { - lapd_ti = proto_tree_add_item(tree, proto_lapd, tvb, 0, -1, - FALSE); - lapd_tree = proto_item_add_subtree(lapd_ti, ett_lapd); - - addr_ti = proto_tree_add_uint(lapd_tree, hf_lapd_address, tvb, - 0, 2, address); - addr_tree = proto_item_add_subtree(addr_ti, ett_lapd_address); - - proto_tree_add_uint(addr_tree, hf_lapd_sapi,tvb, 0, 1, address); - proto_tree_add_uint(addr_tree, hf_lapd_cr, tvb, 0, 1, address); - proto_tree_add_uint(addr_tree, hf_lapd_ea1, tvb, 0, 1, address); - proto_tree_add_uint(addr_tree, hf_lapd_tei, tvb, 1, 1, address); - proto_tree_add_uint(addr_tree, hf_lapd_ea2, tvb, 1, 1, address); - } - else { - lapd_ti = NULL; - lapd_tree = NULL; - } - - control = dissect_xdlc_control(tvb, 2, pinfo, lapd_tree, hf_lapd_control, - ett_lapd_control, &lapd_cf_items, &lapd_cf_items_ext, NULL, NULL, - is_response, TRUE, FALSE); - lapd_header_len += XDLC_CONTROL_LEN(control, TRUE); - - if (tree) - proto_item_set_len(lapd_ti, lapd_header_len); - - next_tvb = tvb_new_subset(tvb, lapd_header_len, -1, -1); - if (XDLC_IS_INFORMATION(control)) { - /* call next protocol */ - if (!dissector_try_port(lapd_sapi_dissector_table, sapi, - next_tvb, pinfo, tree)) - call_dissector(data_handle,next_tvb, pinfo, tree); - } else - call_dissector(data_handle,next_tvb, pinfo, tree); -} - -void -proto_register_lapd(void) -{ - static hf_register_info hf[] = { - { &hf_lapd_address, - { "Address Field", "lapd.address", FT_UINT16, BASE_HEX, NULL, 0x0, - "Address", HFILL }}, - - { &hf_lapd_sapi, - { "SAPI", "lapd.sapi", FT_UINT16, BASE_DEC, VALS(lapd_sapi_vals), LAPD_SAPI, - "Service Access Point Identifier", HFILL }}, - - { &hf_lapd_cr, - { "C/R", "lapd.cr", FT_UINT16, BASE_DEC, NULL, LAPD_CR, - "Command/Response bit", HFILL }}, - - { &hf_lapd_ea1, - { "EA1", "lapd.ea1", FT_UINT16, BASE_DEC, NULL, LAPD_EA1, - "First Address Extension bit", HFILL }}, - - { &hf_lapd_tei, - { "TEI", "lapd.tei", FT_UINT16, BASE_DEC, NULL, LAPD_TEI, - "Terminal Endpoint Identifier", HFILL }}, - - { &hf_lapd_ea2, - { "EA2", "lapd.ea2", FT_UINT16, BASE_DEC, NULL, LAPD_EA2, - "Second Address Extension bit", HFILL }}, - - { &hf_lapd_control, - { "Control Field", "lapd.control", FT_UINT16, BASE_HEX, NULL, 0x0, - "Control field", HFILL }}, - - { &hf_lapd_n_r, - { "N(R)", "lapd.control.n_r", FT_UINT16, BASE_DEC, - NULL, XDLC_N_R_EXT_MASK, "", HFILL }}, - - { &hf_lapd_n_s, - { "N(S)", "lapd.control.n_s", FT_UINT16, BASE_DEC, - NULL, XDLC_N_S_EXT_MASK, "", HFILL }}, - - { &hf_lapd_p, - { "Poll", "lapd.control.p", FT_BOOLEAN, 8, - TFS(&flags_set_truth), XDLC_P_F, "", HFILL }}, - - { &hf_lapd_p_ext, - { "Poll", "lapd.control.p", FT_BOOLEAN, 16, - TFS(&flags_set_truth), XDLC_P_F_EXT, "", HFILL }}, - - { &hf_lapd_f, - { "Final", "lapd.control.f", FT_BOOLEAN, 8, - TFS(&flags_set_truth), XDLC_P_F, "", HFILL }}, - - { &hf_lapd_f_ext, - { "Final", "lapd.control.f", FT_BOOLEAN, 16, - TFS(&flags_set_truth), XDLC_P_F_EXT, "", HFILL }}, - - { &hf_lapd_s_ftype, - { "Supervisory frame type", "lapd.control.s_ftype", FT_UINT16, BASE_HEX, - VALS(stype_vals), XDLC_S_FTYPE_MASK, "", HFILL }}, - - { &hf_lapd_u_modifier_cmd, - { "Command", "lapd.control.u_modifier_cmd", FT_UINT8, BASE_HEX, - VALS(modifier_vals_cmd), XDLC_U_MODIFIER_MASK, "", HFILL }}, - - { &hf_lapd_u_modifier_resp, - { "Response", "lapd.control.u_modifier_resp", FT_UINT8, BASE_HEX, - VALS(modifier_vals_resp), XDLC_U_MODIFIER_MASK, "", HFILL }}, - - { &hf_lapd_ftype_i, - { "Frame type", "lapd.control.ftype", FT_UINT16, BASE_HEX, - VALS(ftype_vals), XDLC_I_MASK, "", HFILL }}, - - { &hf_lapd_ftype_s_u, - { "Frame type", "lapd.control.ftype", FT_UINT8, BASE_HEX, - VALS(ftype_vals), XDLC_S_U_MASK, "", HFILL }}, - - { &hf_lapd_ftype_s_u_ext, - { "Frame type", "lapd.control.ftype", FT_UINT16, BASE_HEX, - VALS(ftype_vals), XDLC_S_U_MASK, "", HFILL }}, - }; - static gint *ett[] = { - &ett_lapd, - &ett_lapd_address, - &ett_lapd_control, - }; - - proto_lapd = proto_register_protocol("Link Access Procedure, Channel D (LAPD)", - "LAPD", "lapd"); - proto_register_field_array (proto_lapd, hf, array_length(hf)); - proto_register_subtree_array(ett, array_length(ett)); - - register_dissector("lapd", dissect_lapd, proto_lapd); - - lapd_sapi_dissector_table = register_dissector_table("lapd.sapi", - "LAPD SAPI", FT_UINT16, BASE_DEC); -} - -void -proto_reg_handoff_lapd(void) -{ - data_handle = find_dissector("data"); - tei_handle = find_dissector("tei"); -} |