435 lines
14 KiB
C
435 lines
14 KiB
C
/* packet-loratap.c
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* Dissector routines for the LoRaTap encapsulation
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* By Erik de Jong <erikdejong@gmail.com>
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* Copyright 2017 Erik de Jong
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*
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* LoRaTap encapsulation, version 1
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* By Ales Povalac <alpov@alpov.net>
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* Copyright 2022 Ales Povalac
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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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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#include "config.h"
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#include <wiretap/wtap.h>
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#include <epan/packet.h>
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#include <epan/capture_dissectors.h>
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#include <epan/decode_as.h>
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#include <epan/proto_data.h>
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#include <epan/to_str.h>
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void proto_reg_handoff_loratap(void);
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void proto_register_loratap(void);
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static dissector_handle_t loratap_handle;
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static dissector_table_t loratap_dissector_table;
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static int proto_loratap = -1;
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static int hf_loratap_header_version_type = -1;
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static int hf_loratap_header_length_type = -1;
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static int hf_loratap_header_padding = -1;
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static int hf_loratap_header_channel_type = -1;
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static int hf_loratap_header_channel_frequency_type = -1;
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static int hf_loratap_header_channel_bandwidth_type = -1;
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static int hf_loratap_header_channel_sf_type = -1;
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static int hf_loratap_header_rssi_type = -1;
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static int hf_loratap_header_rssi_packet_type = -1;
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static int hf_loratap_header_rssi_max_type = -1;
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static int hf_loratap_header_rssi_current_type = -1;
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static int hf_loratap_header_rssi_snr_type = -1;
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static int hf_loratap_header_syncword_type = -1;
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static int hf_loratap_header_tag_type = -1;
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static int hf_loratap_header_payload_type = -1;
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static int hf_loratap_header_source_gw_type = -1;
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static int hf_loratap_header_timestamp_type = -1;
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static int hf_loratap_header_datarate_type = -1;
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static int hf_loratap_header_if_channel_type = -1;
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static int hf_loratap_header_rf_chain_type = -1;
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static int hf_loratap_header_cr_type = -1;
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static int hf_loratap_header_flags_type = -1;
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static int hf_loratap_header_flags_mod_fsk_type = -1;
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static int hf_loratap_header_flags_iq_inverted_type = -1;
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static int hf_loratap_header_flags_implicit_hdr_type = -1;
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static int hf_loratap_header_flags_crc_type = -1;
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static int hf_loratap_header_flags_padding_type = -1;
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static int * const hfx_loratap_header_flags[] = {
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&hf_loratap_header_flags_mod_fsk_type,
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&hf_loratap_header_flags_iq_inverted_type,
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&hf_loratap_header_flags_implicit_hdr_type,
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&hf_loratap_header_flags_crc_type,
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&hf_loratap_header_flags_padding_type,
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NULL
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};
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static gint ett_loratap = -1;
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static gint ett_loratap_flags = -1;
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static gint ett_loratap_channel = -1;
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static gint ett_loratap_rssi = -1;
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static const value_string channel_bandwidth[] = {
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{ 1, "125 kHz" },
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{ 2, "250 kHz" },
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{ 4, "500 kHz" },
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{ 0, NULL}
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};
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static const value_string syncwords[] = {
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{ 0x12, "Private LoRa" },
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{ 0x34, "LoRaWAN" },
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{ 0, NULL}
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};
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static const value_string coding_rates[] = {
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{ 0, "none" },
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{ 5, "4/5" },
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{ 6, "4/6" },
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{ 7, "4/7" },
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{ 8, "4/8" },
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{ 0, NULL}
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};
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static const value_string crc_state[] = {
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{ 1, "CRC OK" },
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{ 2, "CRC Bad" },
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{ 4, "No CRC" },
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{ 0, NULL}
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};
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static void
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rssi_base_custom(gchar *buffer, guint32 value)
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{
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if (value == 255) {
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snprintf(buffer, ITEM_LABEL_LENGTH, "N/A");
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} else {
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snprintf(buffer, ITEM_LABEL_LENGTH, "%.0f dBm", -139. + (float)value);
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}
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}
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static void
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snr_base_custom(gchar *buffer, guint32 value)
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{
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snprintf(buffer, ITEM_LABEL_LENGTH, "%.1f dB", ((gint8)value) / 4.);
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}
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static void
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loratap_prompt(packet_info *pinfo, gchar* result)
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{
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snprintf(result, MAX_DECODE_AS_PROMPT_LEN, "LoRaTap syncword 0x%02x as", GPOINTER_TO_UINT(p_get_proto_data(pinfo->pool, pinfo, proto_loratap, 0)));
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}
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static gpointer
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loratap_value(packet_info *pinfo)
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{
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return p_get_proto_data(pinfo->pool, pinfo, proto_loratap, 0);
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}
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static int
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dissect_loratap(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree _U_, void *data _U_)
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{
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proto_item *ti, *channel_item, *rssi_item;
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proto_tree *loratap_tree, *channel_tree, *rssi_tree;
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gint32 current_offset = 0;
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gint32 header_v1_offset = 15;
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guint16 length;
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guint32 lt_length, lt_version;
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gboolean try_dissect;
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guint32 syncword;
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tvbuff_t *next_tvb;
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "LoRaTap");
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col_clear(pinfo->cinfo, COL_INFO);
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length = tvb_get_guint16(tvb, 2, ENC_BIG_ENDIAN);
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ti = proto_tree_add_item(tree, proto_loratap, tvb, 0, length, ENC_NA);
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loratap_tree = proto_item_add_subtree(ti, ett_loratap);
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proto_tree_add_item_ret_uint(loratap_tree, hf_loratap_header_version_type, tvb, current_offset, 1, ENC_NA, <_version);
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current_offset++;
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proto_tree_add_item(loratap_tree, hf_loratap_header_padding, tvb, current_offset, 1, ENC_NA);
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current_offset++;
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proto_tree_add_item_ret_uint(loratap_tree, hf_loratap_header_length_type, tvb, current_offset, 2, ENC_NA, <_length);
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current_offset += 2;
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if (lt_version == 1) {
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proto_tree_add_item(loratap_tree, hf_loratap_header_source_gw_type, tvb, header_v1_offset, 8, ENC_NA);
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set_address_tvb(&pinfo->dl_src, AT_EUI64, 8, tvb, header_v1_offset);
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copy_address_shallow(&pinfo->src, &pinfo->dl_src);
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proto_item_append_text(ti, ", Src: %s", address_to_display(pinfo->pool, &pinfo->src));
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header_v1_offset += 8;
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proto_tree_add_item(loratap_tree, hf_loratap_header_timestamp_type, tvb, header_v1_offset, 4, ENC_NA);
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header_v1_offset += 4;
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proto_tree_add_bitmask(loratap_tree, tvb, header_v1_offset, hf_loratap_header_flags_type, ett_loratap_flags, hfx_loratap_header_flags, ENC_NA);
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try_dissect = (tvb_get_guint8(tvb, header_v1_offset) & 0x28); /* Only try the next dissector for CRC OK and No CRC packets with v1 encapsulation */
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header_v1_offset++;
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} else {
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try_dissect = true; /* Always try the next dissector for v0 encapsulation */
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}
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channel_item = proto_tree_add_item(loratap_tree, hf_loratap_header_channel_type, tvb, current_offset, 0, ENC_NA);
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channel_tree = proto_item_add_subtree(channel_item, ett_loratap_channel);
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proto_tree_add_item(channel_tree, hf_loratap_header_channel_frequency_type, tvb, current_offset, 4, ENC_NA);
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current_offset += 4;
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proto_tree_add_item(channel_tree, hf_loratap_header_channel_bandwidth_type, tvb, current_offset, 1, ENC_NA);
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current_offset++;
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proto_tree_add_item(channel_tree, hf_loratap_header_channel_sf_type, tvb, current_offset, 1, ENC_NA);
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current_offset++;
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if (lt_version == 1) {
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proto_tree_add_item(channel_tree, hf_loratap_header_cr_type, tvb, header_v1_offset, 1, ENC_NA);
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header_v1_offset++;
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proto_tree_add_item(channel_tree, hf_loratap_header_datarate_type, tvb, header_v1_offset, 2, ENC_NA);
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header_v1_offset += 2;
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proto_tree_add_item(channel_tree, hf_loratap_header_if_channel_type, tvb, header_v1_offset, 1, ENC_NA);
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header_v1_offset++;
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proto_tree_add_item(channel_tree, hf_loratap_header_rf_chain_type, tvb, header_v1_offset, 1, ENC_NA);
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header_v1_offset++;
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}
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rssi_item = proto_tree_add_item(loratap_tree, hf_loratap_header_rssi_type, tvb, current_offset, 0, ENC_NA);
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rssi_tree = proto_item_add_subtree(rssi_item, ett_loratap_rssi);
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proto_tree_add_item(rssi_tree, hf_loratap_header_rssi_packet_type, tvb, current_offset, 1, ENC_NA);
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current_offset++;
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proto_tree_add_item(rssi_tree, hf_loratap_header_rssi_max_type, tvb, current_offset, 1, ENC_NA);
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current_offset++;
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proto_tree_add_item(rssi_tree, hf_loratap_header_rssi_current_type, tvb, current_offset, 1, ENC_NA);
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current_offset++;
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proto_tree_add_item(rssi_tree, hf_loratap_header_rssi_snr_type, tvb, current_offset, 1, ENC_NA);
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current_offset++;
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proto_tree_add_item_ret_uint(loratap_tree, hf_loratap_header_syncword_type, tvb, current_offset, 1, ENC_NA, &syncword);
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current_offset++;
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if (lt_version == 1) {
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proto_tree_add_item(loratap_tree, hf_loratap_header_tag_type, tvb, header_v1_offset, 2, ENC_NA);
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}
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/* Seek to data - skip lt_length of header, this allows future extensions */
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current_offset = lt_length;
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length = tvb_reported_length_remaining(tvb, lt_length);
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proto_tree_add_bytes_format_value(loratap_tree, hf_loratap_header_payload_type, tvb, current_offset, length, NULL, "%d bytes", length);
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p_add_proto_data(pinfo->pool, pinfo, proto_loratap, 0, GUINT_TO_POINTER((guint)syncword));
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next_tvb = tvb_new_subset_length(tvb, current_offset, length);
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if (!try_dissect || !dissector_try_uint_new(loratap_dissector_table, syncword, next_tvb, pinfo, tree, TRUE, NULL)) {
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call_data_dissector(next_tvb, pinfo, tree);
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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_reg_handoff_loratap(void)
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{
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dissector_add_uint("wtap_encap", WTAP_ENCAP_LORATAP, loratap_handle);
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dissector_add_for_decode_as("udp.port", loratap_handle);
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}
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void
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proto_register_loratap(void)
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{
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static hf_register_info hf[] = {
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{ &hf_loratap_header_version_type,
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{ "Header Version", "loratap.version",
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FT_UINT8, BASE_DEC,
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NULL, 0x0,
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NULL, HFILL }
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},
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{ &hf_loratap_header_length_type,
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{ "Header Length", "loratap.header_length",
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FT_UINT16, BASE_DEC|BASE_UNIT_STRING,
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&units_byte_bytes, 0x0,
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NULL, HFILL }
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},
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{ &hf_loratap_header_padding,
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{ "Header Padding", "loratap.padding",
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FT_BYTES, BASE_NONE,
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NULL, 0x0,
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NULL, HFILL }
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},
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{ &hf_loratap_header_channel_type,
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{ "Channel", "loratap.channel",
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FT_NONE, BASE_NONE,
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NULL, 0x0,
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NULL, HFILL }
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},
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{ &hf_loratap_header_channel_frequency_type,
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{ "Frequency", "loratap.channel.frequency",
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FT_UINT32, BASE_DEC|BASE_UNIT_STRING,
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&units_hz, 0x0,
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NULL, HFILL }
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},
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{ &hf_loratap_header_channel_bandwidth_type,
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{ "Bandwidth", "loratap.channel.bandwidth",
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FT_UINT8, BASE_DEC,
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VALS(channel_bandwidth), 0x0,
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NULL, HFILL }
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},
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{ &hf_loratap_header_channel_sf_type,
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{ "Spreading Factor", "loratap.channel.sf",
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FT_UINT8, BASE_DEC,
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NULL, 0x0,
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NULL, HFILL }
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},
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{ &hf_loratap_header_rssi_type,
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{ "RSSI / SNR", "loratap.rssi",
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FT_NONE, BASE_NONE,
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NULL, 0x0,
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NULL, HFILL }
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},
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{ &hf_loratap_header_rssi_packet_type,
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{ "Packet RSSI", "loratap.rssi.packet",
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FT_UINT8, BASE_CUSTOM,
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CF_FUNC(rssi_base_custom), 0x0,
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NULL, HFILL }
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},
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{ &hf_loratap_header_rssi_max_type,
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{ "Max RSSI", "loratap.rssi.max",
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FT_UINT8, BASE_CUSTOM,
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CF_FUNC(rssi_base_custom), 0x0,
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NULL, HFILL }
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},
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{ &hf_loratap_header_rssi_current_type,
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{ "Current RSSI", "loratap.rssi.current",
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FT_UINT8, BASE_CUSTOM,
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CF_FUNC(rssi_base_custom), 0x0,
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NULL, HFILL }
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},
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{ &hf_loratap_header_rssi_snr_type,
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{ "SNR", "loratap.rssi.snr",
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FT_UINT8, BASE_CUSTOM,
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CF_FUNC(snr_base_custom), 0x0,
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NULL, HFILL }
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},
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{ &hf_loratap_header_syncword_type,
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{ "Sync Word", "loratap.syncword",
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FT_UINT8, BASE_HEX,
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VALS(syncwords), 0x0,
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NULL, HFILL }
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},
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{ &hf_loratap_header_tag_type,
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{ "Tag", "loratap.tag",
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FT_UINT16, BASE_DEC,
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NULL, 0x0,
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NULL, HFILL }
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},
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{ &hf_loratap_header_payload_type,
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{ "Payload", "loratap.payload",
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FT_BYTES, BASE_NONE,
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NULL, 0x0,
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NULL, HFILL }
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},
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{ &hf_loratap_header_source_gw_type,
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{ "Source", "loratap.srcgw",
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FT_BYTES, BASE_NONE,
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NULL, 0x0,
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NULL, HFILL }
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},
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{ &hf_loratap_header_timestamp_type,
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{ "Timestamp", "loratap.timestamp",
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FT_UINT32, BASE_DEC,
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NULL, 0x0,
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NULL, HFILL }
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},
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{ &hf_loratap_header_datarate_type,
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{ "FSK datarate", "loratap.channel.datarate",
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FT_UINT16, BASE_DEC|BASE_UNIT_STRING,
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&units_bit_sec, 0x0,
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NULL, HFILL }
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},
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{ &hf_loratap_header_if_channel_type,
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{ "IF channel", "loratap.channel.if_channel",
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FT_UINT8, BASE_DEC,
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NULL, 0x0,
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NULL, HFILL }
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},
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{ &hf_loratap_header_rf_chain_type,
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{ "RF chain", "loratap.channel.rf_chain",
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FT_UINT8, BASE_DEC,
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NULL, 0x0,
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NULL, HFILL }
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},
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{ &hf_loratap_header_cr_type,
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{ "Coding Rate", "loratap.channel.cr",
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FT_UINT8, BASE_DEC,
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VALS(coding_rates), 0x0,
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NULL, HFILL }
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},
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{ &hf_loratap_header_flags_type,
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{ "Flags", "loratap.flags",
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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_loratap_header_flags_mod_fsk_type,
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{ "FSK Modulation", "loratap.flags.mod_fsk",
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FT_BOOLEAN, 8,
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TFS(&tfs_set_notset), 0x01,
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NULL, HFILL }
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},
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{ &hf_loratap_header_flags_iq_inverted_type,
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{ "IQ Inverted", "loratap.flags.iq_inverted",
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FT_BOOLEAN, 8,
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TFS(&tfs_set_notset), 0x02,
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NULL, HFILL }
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},
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{ &hf_loratap_header_flags_implicit_hdr_type,
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{ "Implicit Header", "loratap.flags.implicit_hdr",
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FT_BOOLEAN, 8,
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TFS(&tfs_set_notset), 0x04,
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NULL, HFILL }
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},
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{ &hf_loratap_header_flags_crc_type,
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{ "Checksum", "loratap.flags.crc",
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FT_UINT8, BASE_HEX,
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VALS(crc_state), 0x38,
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NULL, HFILL }
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},
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{ &hf_loratap_header_flags_padding_type,
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{ "Padding", "loratap.flags.padding",
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FT_UINT8, BASE_DEC,
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NULL, 0xC0,
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NULL, HFILL }
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},
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};
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/* Register for decode as */
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static build_valid_func loratap_da_build_value[1] = {loratap_value};
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static decode_as_value_t loratap_da_values = {loratap_prompt, 1, loratap_da_build_value};
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static decode_as_t loratap_da = {"loratap", "loratap.syncword", 1, 0, &loratap_da_values, NULL, NULL, decode_as_default_populate_list, decode_as_default_reset, decode_as_default_change, NULL};
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/* Setup protocol subtree array */
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static gint *ett[] = {
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&ett_loratap,
|
|
&ett_loratap_flags,
|
|
&ett_loratap_channel,
|
|
&ett_loratap_rssi
|
|
};
|
|
|
|
proto_loratap = proto_register_protocol (
|
|
"LoRaTap header", /* name */
|
|
"LoRaTap", /* short name */
|
|
"loratap" /* abbrev */
|
|
);
|
|
|
|
loratap_handle = register_dissector("loratap", dissect_loratap, proto_loratap);
|
|
proto_register_field_array(proto_loratap, hf, array_length(hf));
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
loratap_dissector_table = register_dissector_table("loratap.syncword", "LoRa Syncword", proto_loratap, FT_UINT8, BASE_HEX);
|
|
register_decode_as(&loratap_da);
|
|
}
|
|
|
|
/*
|
|
* 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:
|
|
*/
|