2016-02-03 08:59:08 +00:00
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/* packet-flexray.c
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* Routines for FlexRay dissection
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* Copyright 2016, Roman Leonhartsberger <ro.leonhartsberger@gmail.com>
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include <config.h>
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#include <epan/packet.h>
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#include <epan/decode_as.h>
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#include <epan/prefs.h>
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#include <wiretap/wtap.h>
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#include <epan/expert.h>
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void proto_reg_handoff_flexray(void);
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void proto_register_flexray(void);
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static int proto_flexray = -1;
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static int hf_flexray_measurement_header_field = -1;
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static int hf_flexray_error_flags_field = -1;
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static int hf_flexray_frame_field = -1;
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static int hf_flexray_ti = -1;
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static int hf_flexray_ch = -1;
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static int hf_flexray_fcrc_err = -1;
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static int hf_flexray_hcrc_err = -1;
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static int hf_flexray_fes_err = -1;
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static int hf_flexray_cod_err = -1;
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static int hf_flexray_tss_viol = -1;
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static int hf_flexray_ppi = -1;
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static int hf_flexray_nfi = -1;
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static int hf_flexray_sfi = -1;
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static int hf_flexray_stfi = -1;
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static int hf_flexray_fid = -1;
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static int hf_flexray_pl = -1;
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static int hf_flexray_hcrc = -1;
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static int hf_flexray_cc = -1;
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static int hf_flexray_sl = -1;
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static gint ett_flexray = -1;
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static gint ett_flexray_measurement_header = -1;
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static gint ett_flexray_error_flags = -1;
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static gint ett_flexray_frame = -1;
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static const int *error_fields[] = {
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&hf_flexray_fcrc_err,
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&hf_flexray_hcrc_err,
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&hf_flexray_fes_err,
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&hf_flexray_cod_err,
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&hf_flexray_tss_viol,
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NULL
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};
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static const int *frame_fields[] = {
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&hf_flexray_ppi,
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&hf_flexray_sfi,
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&hf_flexray_stfi,
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NULL
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};
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static expert_field ei_flexray_frame_header = EI_INIT;
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static expert_field ei_flexray_frame_payload = EI_INIT;
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static expert_field ei_flexray_symbol_header = EI_INIT;
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static expert_field ei_flexray_symbol_frame = EI_INIT;
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static expert_field ei_flexray_error_flag = EI_INIT;
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static expert_field ei_flexray_stfi_flag = EI_INIT;
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static dissector_table_t subdissector_table;
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#define FLEXRAY_FRAME 0x01
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#define FLEXRAY_SYMBOL 0x02
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#define FLEXRAY_HEADER_LENGTH 5
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/* Structure that gets passed between dissectors (containing of
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frame id, counter cycle and channel).
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*/
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typedef struct flexray_identifier
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{
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guint16 id;
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guint8 cc;
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guint8 ch;
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} flexray_identifier;
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static const value_string flexray_type_names[] = {
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{ FLEXRAY_FRAME, "FRAME" },
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{ FLEXRAY_SYMBOL, "SYMB" },
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{0, NULL}
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};
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static const true_false_string flexray_channel = {
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"CHB",
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"CHA"
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};
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static const true_false_string flexray_nfi = {
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"False",
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"True"
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};
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static void flexray_prompt(packet_info *pinfo _U_, gchar* result)
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{
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g_snprintf(result, MAX_DECODE_AS_PROMPT_LEN, "Next level protocol as");
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}
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static gpointer flexray_value(packet_info *pinfo _U_)
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{
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return 0;
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}
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static int
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dissect_flexray(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
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{
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proto_item *ti;
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2016-02-24 21:52:52 +00:00
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proto_tree *flexray_tree, *type_info_tree, *error_flags_tree;
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proto_tree *flexray_frame_tree = NULL;
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2016-02-03 08:59:08 +00:00
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tvbuff_t* next_tvb;
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gint frame_length;
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gint flexray_frame_length;
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gint flexray_current_payload_length;
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gint flexray_reported_payload_length;
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guint8 frame_type;
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guint8 symbol_length;
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guint8 error_flag;
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guint8 sfi;
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guint8 stfi;
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guint8 nfi;
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gboolean call_subdissector;
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flexray_identifier flexray_id;
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "FLEXRAY");
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col_clear(pinfo->cinfo, COL_INFO);
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frame_length = tvb_captured_length(tvb);
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frame_type = tvb_get_guint8(tvb, 0) & 0x7f;
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flexray_id.ch = tvb_get_guint8(tvb, 0) & 0x80;
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call_subdissector = TRUE;
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ti = proto_tree_add_item(tree, proto_flexray, tvb, 0, -1, ENC_NA);
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flexray_tree = proto_item_add_subtree(ti, ett_flexray);
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ti = proto_tree_add_item(flexray_tree, hf_flexray_measurement_header_field, tvb, 0, 1, ENC_BIG_ENDIAN);
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type_info_tree = proto_item_add_subtree(ti, ett_flexray_measurement_header);
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proto_tree_add_item(type_info_tree, hf_flexray_ch, tvb, 0, 1, ENC_BIG_ENDIAN);
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proto_tree_add_item(type_info_tree, hf_flexray_ti, tvb, 0, 1, ENC_BIG_ENDIAN);
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col_add_fstr(pinfo->cinfo, COL_INFO, "%s:", val_to_str(frame_type, flexray_type_names, "Unknown (0x%02x)"));
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if (frame_type == FLEXRAY_FRAME) {
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flexray_frame_length = frame_length - 2;
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error_flag = tvb_get_guint8(tvb, 1) & 0x1f;
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ti = proto_tree_add_bitmask(flexray_tree, tvb, 1, hf_flexray_error_flags_field, ett_flexray_error_flags, error_fields, ENC_BIG_ENDIAN);
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error_flags_tree = proto_item_add_subtree(ti, ett_flexray_error_flags);
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if (error_flag) {
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expert_add_info(pinfo, error_flags_tree, &ei_flexray_error_flag);
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call_subdissector = FALSE;
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}
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if (flexray_frame_length < FLEXRAY_HEADER_LENGTH) {
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expert_add_info(pinfo, flexray_tree, &ei_flexray_frame_header);
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call_subdissector = FALSE;
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}
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if (flexray_frame_length > 0) {
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sfi = tvb_get_guint8(tvb, 2) & 0x10;
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stfi = tvb_get_guint8(tvb, 2) & 0x08;
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ti = proto_tree_add_bitmask(flexray_tree, tvb, 2, hf_flexray_frame_field, ett_flexray_frame, frame_fields, ENC_BIG_ENDIAN);
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flexray_frame_tree = proto_item_add_subtree(ti, ett_flexray_frame);
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proto_tree_add_item(flexray_frame_tree, hf_flexray_nfi, tvb, 2, 1, ENC_BIG_ENDIAN);
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if (stfi) {
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if (!sfi) {
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expert_add_info(pinfo, flexray_frame_tree, &ei_flexray_stfi_flag);
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call_subdissector = FALSE;
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}
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}
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}
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if (flexray_frame_length > 1) {
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flexray_id.id = tvb_get_ntohs(tvb, 2) & 0x07ff;
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col_append_fstr(pinfo->cinfo, COL_INFO, " ID %4d", flexray_id.id);
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proto_tree_add_item(flexray_frame_tree, hf_flexray_fid, tvb, 2, 2, ENC_BIG_ENDIAN);
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if (flexray_id.id == 0) {
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call_subdissector = FALSE;
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}
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}
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if (flexray_frame_length > 2) {
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proto_tree_add_item(flexray_frame_tree, hf_flexray_pl, tvb, 4, 1, ENC_BIG_ENDIAN);
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}
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if (flexray_frame_length > 4) {
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flexray_reported_payload_length = tvb_get_guint8(tvb, 4) & 0xfe;
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flexray_reported_payload_length = 2 * (flexray_reported_payload_length >> 1);
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flexray_current_payload_length = flexray_frame_length - FLEXRAY_HEADER_LENGTH;
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flexray_id.cc = tvb_get_guint8(tvb, 6) & 0x3f;
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nfi = tvb_get_guint8(tvb, 2) & 0x20;
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col_append_fstr(pinfo->cinfo, COL_INFO, " CC %2d", flexray_id.cc);
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proto_tree_add_item(flexray_frame_tree, hf_flexray_hcrc, tvb, 4, 3, ENC_BIG_ENDIAN);
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proto_tree_add_item(flexray_frame_tree, hf_flexray_cc, tvb, 6, 1, ENC_BIG_ENDIAN);
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if (nfi) {
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col_append_fstr(pinfo->cinfo, COL_INFO, " %s", tvb_bytes_to_str_punct(wmem_packet_scope(), tvb, 7, flexray_current_payload_length, ' '));
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if (flexray_current_payload_length != flexray_reported_payload_length) {
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expert_add_info(pinfo, flexray_frame_tree, &ei_flexray_frame_payload);
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call_subdissector = FALSE;
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}
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}
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else {
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call_subdissector = FALSE;
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col_append_fstr(pinfo->cinfo, COL_INFO, " NF");
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if (flexray_current_payload_length != flexray_reported_payload_length && flexray_current_payload_length != 0) {
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expert_add_info(pinfo, flexray_frame_tree, &ei_flexray_frame_payload);
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}
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}
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next_tvb = tvb_new_subset_length(tvb, 7, flexray_current_payload_length);
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if (call_subdissector) {
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if (!dissector_try_uint_new(subdissector_table, 0, next_tvb, pinfo, tree, FALSE, &flexray_id))
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{
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2016-03-20 00:33:14 +00:00
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call_data_dissector(next_tvb, pinfo, tree);
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2016-02-03 08:59:08 +00:00
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}
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}
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else {
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2016-03-20 00:33:14 +00:00
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call_data_dissector(next_tvb, pinfo, tree);
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2016-02-03 08:59:08 +00:00
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}
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}
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}
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if ((frame_type & 0x07ff) == FLEXRAY_SYMBOL) {
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flexray_frame_length = frame_length - 1;
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expert_add_info(pinfo, flexray_tree, &ei_flexray_symbol_frame);
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if (flexray_frame_length > 0) {
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symbol_length = tvb_get_guint8(tvb, 1) & 0x7f;
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col_append_fstr(pinfo->cinfo, COL_INFO, " SL %3d", symbol_length);
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proto_tree_add_item(flexray_tree, hf_flexray_sl, tvb, 1, 1, ENC_BIG_ENDIAN);
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}
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else {
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expert_add_info(pinfo, flexray_tree, &ei_flexray_symbol_header);
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}
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}
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return tvb_captured_length(tvb);
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}
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void
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proto_register_flexray(void)
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{
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expert_module_t *expert_flexray;
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static hf_register_info hf[] = {
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{ &hf_flexray_measurement_header_field,
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{ "Measurement Header", "flexray.mhf",
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FT_UINT8, BASE_HEX,
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NULL, 0x0,
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NULL, HFILL }
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},
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{ &hf_flexray_ti,
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{ "Type Index", "flexray.ti",
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FT_UINT8, BASE_HEX,
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VALS(flexray_type_names), 0x7f,
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NULL, HFILL }
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},
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{ &hf_flexray_ch,
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{ "Channel", "flexray.ch",
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FT_BOOLEAN, 8,
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TFS(&flexray_channel), 0x80,
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NULL, HFILL }
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},
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{ &hf_flexray_error_flags_field,
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{ "Error Flags", "flexray.eff",
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FT_UINT8, BASE_HEX,
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NULL, 0x0,
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NULL, HFILL }
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},
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{ &hf_flexray_fcrc_err,
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{ "Frame CRC error", "flexray.fcrc_err",
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FT_BOOLEAN, 8,
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NULL, 0x10,
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NULL, HFILL }
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},
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{ &hf_flexray_hcrc_err,
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{ "Header CRC error", "flexray.hcrc_err",
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FT_BOOLEAN, 8,
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NULL, 0x08,
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NULL, HFILL }
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},
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{ &hf_flexray_fes_err,
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{ "Frame End Sequence error", "flexray.fes_err",
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FT_BOOLEAN, 8,
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NULL, 0x04,
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NULL, HFILL }
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},
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{ &hf_flexray_cod_err,
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{ "Coding error", "flexray.cod_err",
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FT_BOOLEAN, 8,
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NULL, 0x02,
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NULL, HFILL }
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|
|
|
},
|
|
|
|
{ &hf_flexray_tss_viol,
|
|
|
|
{ "TSS violation", "flexray.tss_viol",
|
|
|
|
FT_BOOLEAN, 8,
|
|
|
|
NULL, 0x01,
|
|
|
|
NULL, HFILL }
|
|
|
|
},
|
|
|
|
{ &hf_flexray_frame_field,
|
|
|
|
{ "FlexRay Frame", "flexray.ff",
|
|
|
|
FT_UINT8, BASE_HEX,
|
|
|
|
NULL, 0x0,
|
|
|
|
NULL, HFILL }
|
|
|
|
},
|
|
|
|
{ &hf_flexray_ppi,
|
|
|
|
{ "Payload preamble Indicator", "flexray.ppi",
|
|
|
|
FT_BOOLEAN, 8,
|
|
|
|
NULL, 0x40,
|
|
|
|
NULL, HFILL }
|
|
|
|
},
|
|
|
|
{ &hf_flexray_nfi,
|
|
|
|
{ "Null Frame", "flexray.nfi",
|
|
|
|
FT_BOOLEAN, 8,
|
|
|
|
TFS(&flexray_nfi), 0x20,
|
|
|
|
NULL, HFILL }
|
|
|
|
},
|
|
|
|
{ &hf_flexray_sfi,
|
|
|
|
{ "Sync Frame Indicator", "flexray.sfi",
|
|
|
|
FT_BOOLEAN, 8,
|
|
|
|
NULL, 0x10,
|
|
|
|
NULL, HFILL }
|
|
|
|
},
|
|
|
|
{ &hf_flexray_stfi,
|
|
|
|
{ "Startup Frame Indicator", "flexray.stfi",
|
|
|
|
FT_BOOLEAN, 8,
|
|
|
|
NULL, 0x08,
|
|
|
|
NULL, HFILL }
|
|
|
|
},
|
|
|
|
{ &hf_flexray_fid,
|
|
|
|
{ "Frame ID", "flexray.fid",
|
|
|
|
FT_UINT16, BASE_DEC,
|
|
|
|
NULL, 0x07ff,
|
|
|
|
NULL, HFILL }
|
|
|
|
},
|
|
|
|
{ &hf_flexray_pl,
|
|
|
|
{ "Payload length", "flexray.pl",
|
|
|
|
FT_UINT8, BASE_DEC,
|
|
|
|
NULL, 0xfe,
|
|
|
|
NULL, HFILL }
|
|
|
|
},
|
|
|
|
{ &hf_flexray_hcrc,
|
|
|
|
{ "Header CRC", "flexray.hcrc",
|
|
|
|
FT_UINT24, BASE_DEC,
|
|
|
|
NULL, 0x01ffc0,
|
|
|
|
NULL, HFILL }
|
|
|
|
},
|
|
|
|
{ &hf_flexray_cc,
|
|
|
|
{ "Cycle Counter", "flexray.cc",
|
|
|
|
FT_UINT8, BASE_DEC,
|
|
|
|
NULL, 0x3f,
|
|
|
|
NULL, HFILL }
|
|
|
|
},
|
|
|
|
{ &hf_flexray_sl,
|
|
|
|
{ "Symbol length", "flexray.sl",
|
|
|
|
FT_UINT8, BASE_DEC,
|
|
|
|
NULL, 0x7f,
|
|
|
|
NULL, HFILL }
|
|
|
|
}
|
|
|
|
};
|
|
|
|
|
|
|
|
static gint *ett[] = {
|
|
|
|
&ett_flexray,
|
|
|
|
&ett_flexray_measurement_header,
|
|
|
|
&ett_flexray_error_flags,
|
|
|
|
&ett_flexray_frame
|
|
|
|
};
|
|
|
|
|
|
|
|
static ei_register_info ei[] = {
|
|
|
|
{ &ei_flexray_frame_header,
|
|
|
|
{ "flexray.frame_header", PI_MALFORMED, PI_ERROR,
|
|
|
|
"Frame Header is malformed", EXPFILL }
|
|
|
|
},
|
|
|
|
{ &ei_flexray_frame_payload,
|
|
|
|
{ "flexray.malformed_frame_payload", PI_MALFORMED, PI_ERROR,
|
|
|
|
"Frame Payload is malformed", EXPFILL }
|
|
|
|
},
|
|
|
|
{ &ei_flexray_symbol_header,
|
|
|
|
{ "flexray.malformed_symbol_frame", PI_MALFORMED, PI_ERROR,
|
|
|
|
"Symbol Frame is malformed", EXPFILL }
|
|
|
|
},
|
|
|
|
{ &ei_flexray_symbol_frame,
|
|
|
|
{ "flexray.symbol_frame", PI_SEQUENCE, PI_CHAT,
|
|
|
|
"Packet is a Symbol Frame", EXPFILL }
|
|
|
|
},
|
|
|
|
{ &ei_flexray_error_flag,
|
|
|
|
{ "flexray.error_flag", PI_PROTOCOL, PI_WARN,
|
|
|
|
"Error Flag is set", EXPFILL }
|
|
|
|
},
|
|
|
|
{ &ei_flexray_stfi_flag,
|
|
|
|
{ "flexray.stfi_flag", PI_PROTOCOL, PI_WARN,
|
|
|
|
"A startup frame must always be a sync frame", EXPFILL }
|
|
|
|
}
|
|
|
|
};
|
|
|
|
|
|
|
|
/* Decode As handling */
|
|
|
|
static build_valid_func flexray_da_build_value[1] = { flexray_value };
|
|
|
|
static decode_as_value_t flexray_da_values = { flexray_prompt, 1, flexray_da_build_value };
|
|
|
|
static decode_as_t flexray_da = { "flexray", "Network", "flexray.subdissector", 1, 0, &flexray_da_values, NULL, NULL,
|
|
|
|
decode_as_default_populate_list, decode_as_default_reset, decode_as_default_change, NULL };
|
|
|
|
|
|
|
|
proto_flexray = proto_register_protocol(
|
|
|
|
"FlexRay Protocol",
|
|
|
|
"FLEXRAY",
|
|
|
|
"flexray"
|
|
|
|
);
|
|
|
|
|
|
|
|
proto_register_field_array(proto_flexray, hf, array_length(hf));
|
|
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
|
|
|
|
|
|
expert_flexray = expert_register_protocol(proto_flexray);
|
|
|
|
expert_register_field_array(expert_flexray, ei, array_length(ei));
|
|
|
|
|
|
|
|
register_dissector("flexray", dissect_flexray, proto_flexray);
|
|
|
|
register_decode_as(&flexray_da);
|
|
|
|
|
|
|
|
subdissector_table = register_dissector_table("flexray.subdissector",
|
2016-03-13 11:51:45 +00:00
|
|
|
"FLEXRAY next level dissector", proto_flexray, FT_UINT32, BASE_HEX, DISSECTOR_TABLE_NOT_ALLOW_DUPLICATE);
|
2016-02-03 08:59:08 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
void
|
|
|
|
proto_reg_handoff_flexray(void)
|
|
|
|
{
|
|
|
|
static dissector_handle_t flexray_handle;
|
|
|
|
|
|
|
|
flexray_handle = create_dissector_handle( dissect_flexray, proto_flexray );
|
|
|
|
dissector_add_uint("wtap_encap", WTAP_ENCAP_FLEXRAY, flexray_handle);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Editor modelines - https://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:
|
|
|
|
*/
|