/* packet-v120.c * Routines for v120 frame disassembly * Bert Driehuis * * Wireshark - Network traffic analyzer * By Gerald Combs * 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ #include "config.h" #include #include void proto_register_v120(void); static int proto_v120 = -1; static int hf_v120_address = -1; static int hf_v120_rc = -1; static int hf_v120_lli = -1; static int hf_v120_ea0 = -1; static int hf_v120_ea1 = -1; static int hf_v120_control = -1; static int hf_v120_n_r = -1; static int hf_v120_n_s = -1; static int hf_v120_p = -1; static int hf_v120_p_ext = -1; static int hf_v120_f = -1; static int hf_v120_f_ext = -1; static int hf_v120_s_ftype = -1; static int hf_v120_u_modifier_cmd = -1; static int hf_v120_u_modifier_resp = -1; static int hf_v120_ftype_i = -1; static int hf_v120_ftype_s_u = -1; static int hf_v120_ftype_s_u_ext = -1; static int hf_v120_header8 = -1; static int hf_v120_header_ext8 = -1; static int hf_v120_header_break8 = -1; static int hf_v120_header_error_control8 = -1; static int hf_v120_header_segb8 = -1; static int hf_v120_header_segf8 = -1; static int hf_v120_header16 = -1; static int hf_v120_header_ext16 = -1; static int hf_v120_header_break16 = -1; static int hf_v120_header_error_control16 = -1; static int hf_v120_header_segb16 = -1; static int hf_v120_header_segf16 = -1; static int hf_v120_header_e = -1; static int hf_v120_header_dr = -1; static int hf_v120_header_sr = -1; static int hf_v120_header_rr = -1; static gint ett_v120 = -1; static gint ett_v120_address = -1; static gint ett_v120_control = -1; static gint ett_v120_header = -1; static int dissect_v120_header(tvbuff_t *tvb, int offset, proto_tree *tree); /* Used only for U frames */ static const xdlc_cf_items v120_cf_items = { NULL, NULL, &hf_v120_p, &hf_v120_f, NULL, &hf_v120_u_modifier_cmd, &hf_v120_u_modifier_resp, NULL, &hf_v120_ftype_s_u }; /* Used only for I and S frames */ static const xdlc_cf_items v120_cf_items_ext = { &hf_v120_n_r, &hf_v120_n_s, &hf_v120_p_ext, &hf_v120_f_ext, &hf_v120_s_ftype, NULL, NULL, &hf_v120_ftype_i, &hf_v120_ftype_s_u_ext }; static int dissect_v120(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_) { proto_tree *v120_tree, *address_tree; proto_item *ti, *tc; int is_response; int v120len; guint8 byte0, byte1; guint16 control; tvbuff_t *next_tvb; col_set_str(pinfo->cinfo, COL_PROTOCOL, "V.120"); col_clear(pinfo->cinfo, COL_INFO); byte0 = tvb_get_guint8(tvb, 0); col_add_fstr(pinfo->cinfo, COL_RES_DL_SRC, "0x%02X", byte0); byte1 = tvb_get_guint8(tvb, 1); if ( ((byte0 & 0x01) != 0x00) && ((byte1 & 0x01) != 0x01) ) { col_set_str(pinfo->cinfo, COL_INFO, "Invalid V.120 frame"); if (tree) proto_tree_add_protocol_format(tree, proto_v120, tvb, 0, -1, "Invalid V.120 frame"); return 2; } if (pinfo->p2p_dir == P2P_DIR_SENT) { is_response = (byte0 & 0x02) ? FALSE: TRUE; col_set_str(pinfo->cinfo, COL_RES_DL_DST, "DCE"); col_set_str(pinfo->cinfo, COL_RES_DL_SRC, "DTE"); } else { /* XXX - what if the direction is unknown? */ is_response = (byte0 & 0x02) ? TRUE : FALSE; col_set_str(pinfo->cinfo, COL_RES_DL_DST, "DTE"); col_set_str(pinfo->cinfo, COL_RES_DL_SRC, "DCE"); } ti = proto_tree_add_protocol_format(tree, proto_v120, tvb, 0, -1, "V.120"); v120_tree = proto_item_add_subtree(ti, ett_v120); tc = proto_tree_add_item(v120_tree, hf_v120_address, tvb, 0, 2, ENC_BIG_ENDIAN); proto_item_append_text(tc, "LLI: %d C/R: %s", ((byte0 & 0xfc) << 5) | ((byte1 & 0xfe) >> 1), byte0 & 0x02 ? "R" : "C"); address_tree = proto_item_add_subtree(tc, ett_v120_address); proto_tree_add_item(address_tree, hf_v120_rc, tvb, 0, 2, ENC_BIG_ENDIAN); proto_tree_add_item(address_tree, hf_v120_lli, tvb, 0, 2, ENC_BIG_ENDIAN); proto_tree_add_item(address_tree, hf_v120_ea0, tvb, 0, 2, ENC_BIG_ENDIAN); proto_tree_add_item(address_tree, hf_v120_ea1, tvb, 0, 2, ENC_BIG_ENDIAN); control = dissect_xdlc_control(tvb, 2, pinfo, v120_tree, hf_v120_control, ett_v120_control, &v120_cf_items, &v120_cf_items_ext, NULL, NULL, is_response, TRUE, FALSE); v120len = 2 + XDLC_CONTROL_LEN(control, TRUE); if (tvb_bytes_exist(tvb, v120len, 1)) v120len += dissect_v120_header(tvb, v120len, v120_tree); proto_item_set_len(ti, v120len); next_tvb = tvb_new_subset_remaining(tvb, v120len); call_data_dissector(next_tvb, pinfo, v120_tree); return tvb_captured_length(tvb); } static int dissect_v120_header(tvbuff_t *tvb, int offset, proto_tree *tree) { int header_len; guint8 byte0; proto_tree *h_tree; proto_item *tc; byte0 = tvb_get_guint8(tvb, offset); if (byte0 & 0x80) { header_len = 1; tc = proto_tree_add_item(tree, hf_v120_header8, tvb, 0, 1, ENC_BIG_ENDIAN); h_tree = proto_item_add_subtree(tc, ett_v120_header); proto_tree_add_item(h_tree, hf_v120_header_ext8, tvb, 0, 1, ENC_NA); proto_tree_add_item(h_tree, hf_v120_header_break8, tvb, 0, 1, ENC_NA); proto_tree_add_item(h_tree, hf_v120_header_error_control8, tvb, 0, 1, ENC_BIG_ENDIAN); proto_tree_add_item(h_tree, hf_v120_header_segb8, tvb, 0, 1, ENC_NA); proto_tree_add_item(h_tree, hf_v120_header_segf8, tvb, 0, 1, ENC_NA); } else { header_len = 2; tc = proto_tree_add_item(tree, hf_v120_header16, tvb, 0, 2, ENC_BIG_ENDIAN); h_tree = proto_item_add_subtree(tc, ett_v120_header); proto_tree_add_item(h_tree, hf_v120_header_ext16, tvb, 0, 2, ENC_BIG_ENDIAN); proto_tree_add_item(h_tree, hf_v120_header_break16, tvb, 0, 2, ENC_BIG_ENDIAN); proto_tree_add_item(h_tree, hf_v120_header_error_control16, tvb, 0, 2, ENC_BIG_ENDIAN); proto_tree_add_item(h_tree, hf_v120_header_segb16, tvb, 0, 2, ENC_BIG_ENDIAN); proto_tree_add_item(h_tree, hf_v120_header_segf16, tvb, 0, 2, ENC_BIG_ENDIAN); proto_tree_add_item(h_tree, hf_v120_header_e, tvb, 0, 2, ENC_BIG_ENDIAN); proto_tree_add_item(h_tree, hf_v120_header_dr, tvb, 0, 2, ENC_BIG_ENDIAN); proto_tree_add_item(h_tree, hf_v120_header_sr, tvb, 0, 2, ENC_BIG_ENDIAN); proto_tree_add_item(h_tree, hf_v120_header_rr, tvb, 0, 2, ENC_BIG_ENDIAN); } proto_item_append_text(tc, " B: %d F: %d", byte0 & 0x02 ? 1:0, byte0 & 0x01 ? 1:0); return header_len; } void proto_register_v120(void) { static hf_register_info hf[] = { { &hf_v120_address, { "Link Address", "v120.address", FT_UINT16, BASE_HEX, NULL, 0x0, NULL, HFILL }}, { &hf_v120_rc, { "R/C", "v120.rc", FT_BOOLEAN, 16, TFS(&tfs_response_command), 0x0002, NULL, HFILL }}, { &hf_v120_lli, { "LLI", "v120.lli", FT_UINT16, BASE_HEX, NULL, 0xfefc, NULL, HFILL }}, { &hf_v120_ea0, { "EA0", "v120.ea0", FT_BOOLEAN, 16, TFS(&tfs_error_ok), 0x0001, NULL, HFILL }}, { &hf_v120_ea1, { "EA1", "v120.ea1", FT_BOOLEAN, 16, TFS(&tfs_ok_error), 0x0100, NULL, HFILL }}, { &hf_v120_control, { "Control Field", "v120.control", FT_UINT16, BASE_HEX, NULL, 0x0, NULL, HFILL }}, { &hf_v120_n_r, { "N(R)", "v120.control.n_r", FT_UINT16, BASE_DEC, NULL, XDLC_N_R_EXT_MASK, NULL, HFILL }}, { &hf_v120_n_s, { "N(S)", "v120.control.n_s", FT_UINT16, BASE_DEC, NULL, XDLC_N_S_EXT_MASK, NULL, HFILL }}, { &hf_v120_p, { "Poll", "v120.control.p", FT_BOOLEAN, 8, TFS(&tfs_set_notset), XDLC_P_F, NULL, HFILL }}, { &hf_v120_p_ext, { "Poll", "v120.control.p", FT_BOOLEAN, 16, TFS(&tfs_set_notset), XDLC_P_F_EXT, NULL, HFILL }}, { &hf_v120_f, { "Final", "v120.control.f", FT_BOOLEAN, 8, TFS(&tfs_set_notset), XDLC_P_F, NULL, HFILL }}, { &hf_v120_f_ext, { "Final", "v120.control.f", FT_BOOLEAN, 16, TFS(&tfs_set_notset), XDLC_P_F_EXT, NULL, HFILL }}, { &hf_v120_s_ftype, { "Supervisory frame type", "v120.control.s_ftype", FT_UINT16, BASE_HEX, VALS(stype_vals), XDLC_S_FTYPE_MASK, NULL, HFILL }}, { &hf_v120_u_modifier_cmd, { "Command", "v120.control.u_modifier_cmd", FT_UINT8, BASE_HEX, VALS(modifier_vals_cmd), XDLC_U_MODIFIER_MASK, NULL, HFILL }}, { &hf_v120_u_modifier_resp, { "Response", "v120.control.u_modifier_resp", FT_UINT8, BASE_HEX, VALS(modifier_vals_resp), XDLC_U_MODIFIER_MASK, NULL, HFILL }}, { &hf_v120_ftype_i, { "Frame type", "v120.control.ftype", FT_UINT16, BASE_HEX, VALS(ftype_vals), XDLC_I_MASK, NULL, HFILL }}, { &hf_v120_ftype_s_u, { "Frame type", "v120.control.ftype", FT_UINT8, BASE_HEX, VALS(ftype_vals), XDLC_S_U_MASK, NULL, HFILL }}, { &hf_v120_ftype_s_u_ext, { "Frame type", "v120.control.ftype", FT_UINT16, BASE_HEX, VALS(ftype_vals), XDLC_S_U_MASK, NULL, HFILL }}, { &hf_v120_header8, { "Header", "v120.header", FT_UINT8, BASE_HEX, NULL, 0x0, NULL, HFILL }}, { &hf_v120_header_ext8, { "Extension octet", "v120.header.ext", FT_BOOLEAN, 8, TFS(&tfs_yes_no), 0x80, NULL, HFILL }}, { &hf_v120_header_break8, { "Break condition", "v120.header.break", FT_BOOLEAN, 8, TFS(&tfs_yes_no), 0x40, NULL, HFILL }}, { &hf_v120_header_error_control8, { "Error control C1/C2", "v120.error_control", FT_UINT8, BASE_HEX, NULL, 0x0C, NULL, HFILL }}, { &hf_v120_header_segb8, { "Bit B", "v120.header.segb", FT_BOOLEAN, 8, TFS(&tfs_segmentation_no_segmentation), 0x02, NULL, HFILL }}, { &hf_v120_header_segf8, { "Bit F", "v120.header.segf", FT_BOOLEAN, 8, TFS(&tfs_segmentation_no_segmentation), 0x01, NULL, HFILL }}, { &hf_v120_header16, { "Header", "v120.header", FT_UINT16, BASE_HEX, NULL, 0x0, NULL, HFILL }}, { &hf_v120_header_ext16, { "Extension octet", "v120.header.ext", FT_BOOLEAN, 16, TFS(&tfs_yes_no), 0x80, NULL, HFILL }}, { &hf_v120_header_break16, { "Break condition", "v120.header.break", FT_BOOLEAN, 16, TFS(&tfs_yes_no), 0x40, NULL, HFILL }}, { &hf_v120_header_error_control16, { "Error control C1/C2", "v120.error_control", FT_UINT16, BASE_HEX, NULL, 0x0C, NULL, HFILL }}, { &hf_v120_header_segb16, { "Bit B", "v120.header.segb", FT_BOOLEAN, 16, TFS(&tfs_segmentation_no_segmentation), 0x02, NULL, HFILL }}, { &hf_v120_header_segf16, { "Bit F", "v120.header.segf", FT_BOOLEAN, 16, TFS(&tfs_segmentation_no_segmentation), 0x01, NULL, HFILL }}, { &hf_v120_header_e, { "E", "v120.header.e", FT_BOOLEAN, 16, TFS(&tfs_yes_no), 0x8000, NULL, HFILL }}, { &hf_v120_header_dr, { "DR", "v120.header.dr", FT_BOOLEAN, 16, TFS(&tfs_yes_no), 0x4000, NULL, HFILL }}, { &hf_v120_header_sr, { "SR", "v120.header.sr", FT_BOOLEAN, 16, TFS(&tfs_yes_no), 0x2000, NULL, HFILL }}, { &hf_v120_header_rr, { "RR", "v120.header.rr", FT_BOOLEAN, 16, TFS(&tfs_yes_no), 0x1000, NULL, HFILL }}, }; static gint *ett[] = { &ett_v120, &ett_v120_address, &ett_v120_control, &ett_v120_header, }; proto_v120 = proto_register_protocol("Async data over ISDN (V.120)", "V.120", "v120"); proto_register_field_array (proto_v120, hf, array_length(hf)); proto_register_subtree_array(ett, array_length(ett)); register_dissector("v120", dissect_v120, proto_v120); } /* * Editor modelines - http://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: */