2016-07-21 07:55:03 +00:00
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/* packet-nordic_ble.c
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2016-08-08 17:27:38 +00:00
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* Routines for Nordic BLE sniffer dissection
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2016-07-21 07:55:03 +00:00
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*
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2018-03-13 08:28:15 +00:00
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* Copyright (c) 2016-2018 Nordic Semiconductor.
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2016-07-21 07:55:03 +00:00
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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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2018-03-07 13:08:18 +00:00
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* SPDX-License-Identifier: GPL-2.0-or-later
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2016-07-21 07:55:03 +00:00
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*/
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2017-08-19 20:02:43 +00:00
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/* Nordic BLE Sniffer packet format: BoardID + Header + Payload
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*
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* +--------+--------+--------+--------+--------+--------+--------+--------+
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* | BoardID (1 byte) |
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* +--------+--------+--------+--------+--------+--------+--------+--------+
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*
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2018-03-13 08:28:15 +00:00
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* Header version 0 (legacy):
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* +--------+--------+--------+--------+--------+--------+--------+--------+
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* | Packet ID (1 byte) |
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* +--------+--------+--------+--------+--------+--------+--------+--------+
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* | Packet counter (LSB) |
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* | (2 bytes) |
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* +--------+--------+--------+--------+--------+--------+--------+--------+
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* | Unused |
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* | (2 bytes) |
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* +--------+--------+--------+--------+--------+--------+--------+--------+
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* | Length of payload (1 byte) |
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* +--------+--------+--------+--------+--------+--------+--------+--------+
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*
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* Header version 1:
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2017-08-19 20:02:43 +00:00
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* +--------+--------+--------+--------+--------+--------+--------+--------+
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* | Length of header (1 byte) |
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* +--------+--------+--------+--------+--------+--------+--------+--------+
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* | Length of payload (1 byte) |
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* +--------+--------+--------+--------+--------+--------+--------+--------+
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* | Protocol version (1 byte) |
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* +--------+--------+--------+--------+--------+--------+--------+--------+
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* | Packet counter (LSB) |
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* | (2 bytes) |
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* +--------+--------+--------+--------+--------+--------+--------+--------+
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* | Packet ID (1 byte) |
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* +--------+--------+--------+--------+--------+--------+--------+--------+
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*
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2018-03-13 08:28:15 +00:00
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* Header version 2:
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* +--------+--------+--------+--------+--------+--------+--------+--------+
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* | Length of payload (little endian) |
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* | (2 bytes) |
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* +--------+--------+--------+--------+--------+--------+--------+--------+
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* | Protocol version (1 byte) |
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* +--------+--------+--------+--------+--------+--------+--------+--------+
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* | Packet counter (little endian) |
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* | (2 bytes) |
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* +--------+--------+--------+--------+--------+--------+--------+--------+
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* | Packet ID (1 byte) |
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* +--------+--------+--------+--------+--------+--------+--------+--------+
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*
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2017-08-19 20:02:43 +00:00
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* Packet ID:
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* 0x00 = REQ_FOLLOW
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* Host tells the Sniffer to only send packets received from a specific
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* address.
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* 0x01 = EVENT_FOLLOW
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* Sniffer tells the Host that it has entered the FOLLOW state.
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* 0x05 = EVENT_CONNECT
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* Sniffer tells the Host that someone has connected to the unit we
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* are following.
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* 0x06 = EVENT_PACKET
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* Sniffer tells the Host that it has received a packet.
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* 0x07 = REQ_SCAN_CONT
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* Host tells the Sniffer to scan continuously and hand over the
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* packets ASAP.
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* 0x09 = EVENT_DISCONNECT
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* Sniffer tells the Host that the connected address we were following
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* has received a disconnect packet.
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* 0x0C = SET_TEMPORARY_KEY
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* Specify a temporary key to use on encryption (for OOB and passkey).
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* 0x0D = PING_REQ
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* 0x0E = PING_RESP
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* 0x13 = SWITCH_BAUD_RATE_REQ
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* 0x14 = SWITCH_BAUD_RATE_RESP
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* 0x17 = SET_ADV_CHANNEL_HOP_SEQ
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* Host tells the Sniffer which order to cycle through the channels
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* when following an advertiser.
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* 0xFE = GO_IDLE
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* Host tell the Sniffer to stop sending UART traffic and listen for
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* new commands.
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*
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* Payloads:
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*
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* EVENT_PACKET (ID 0x06):
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* +--------+--------+--------+--------+--------+--------+--------+--------+
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* | Length of payload data (1 byte) |
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* +--------+--------+--------+--------+--------+--------+--------+--------+
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* | Flags (1 byte) |
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* +--------+--------+--------+--------+--------+--------+--------+--------+
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* | Channel (1 byte) |
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* +--------+--------+--------+--------+--------+--------+--------+--------+
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* | RSSI (dBm) (1 byte) |
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* +--------+--------+--------+--------+--------+--------+--------+--------+
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* | Event counter |
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* | (2 bytes) |
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* +--------+--------+--------+--------+--------+--------+--------+--------+
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* | |
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* | Delta time (us end to start) |
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* | (4 bytes) |
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* | |
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* +--------+--------+--------+--------+--------+--------+--------+--------+
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*
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* +--------+--------+--------+--------+--------+--------+--------+--------+
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* | |
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* | Bluetooth Low Energy Link Layer Packet |
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* | ... |
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* | |
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* +--------+--------+--------+--------+--------+--------+--------+--------+
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*
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* Flags:
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2018-03-13 08:28:15 +00:00
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* 0000000x = CRC (0 = Incorrect, 1 = OK)
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* 000000x0 = Direction (0 = Slave -> Master, 1 = Master -> Slave)
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* 00000x00 = Encrypted (0 = No, 1 = Yes)
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* 0000x000 = MIC (0 = Incorrect, 1 = OK)
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* 0xxx0000 = PHY (0 = 1M, 1 = 2M, 2 = Coded, rest unused)
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* x0000000 = RFU
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2017-08-19 20:02:43 +00:00
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*
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* Channel:
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* The channel index being used.
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*
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* Delta time:
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* This is the time in micro seconds from the end of the previous received
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* packet to the beginning of this packet.
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*/
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2016-07-21 07:55:03 +00:00
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#include "config.h"
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#include <epan/packet.h>
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#include <epan/expert.h>
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2017-08-24 07:51:04 +00:00
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#include <epan/proto_data.h>
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#include <wsutil/utf8_entities.h>
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2017-08-26 09:21:52 +00:00
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#include <wiretap/wtap.h>
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2016-07-21 07:55:03 +00:00
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2016-08-02 11:54:46 +00:00
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#include "packet-btle.h"
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2016-07-21 07:55:03 +00:00
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/* Size of various UART Packet header fields */
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2018-03-13 08:28:15 +00:00
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#define UART_HEADER_LEN 6
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#define EVENT_PACKET_LEN 10
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2016-12-14 09:17:42 +00:00
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2018-03-13 08:28:15 +00:00
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#define US_PER_BYTE_1M_PHY 8
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#define US_PER_BYTE_2M_PHY 4
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2016-12-14 09:17:42 +00:00
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2018-03-13 08:28:15 +00:00
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#define PREAMBLE_LEN_1M_PHY 1
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#define PREAMBLE_LEN_2M_PHY 2
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2016-07-21 07:55:03 +00:00
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void proto_reg_handoff_nordic_ble(void);
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void proto_register_nordic_ble(void);
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/* Initialize the protocol and registered fields */
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static int proto_nordic_ble = -1;
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/* Initialize the subtree pointers */
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static gint ett_nordic_ble = -1;
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2016-12-14 09:17:42 +00:00
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static gint ett_packet_header = -1;
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2016-07-21 07:55:03 +00:00
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static gint ett_flags = -1;
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static int hf_nordic_ble_board_id = -1;
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2016-12-14 19:27:54 +00:00
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static int hf_nordic_ble_legacy_marker = -1;
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2016-12-14 09:17:42 +00:00
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static int hf_nordic_ble_header = -1;
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2016-07-21 07:55:03 +00:00
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static int hf_nordic_ble_header_length = -1;
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static int hf_nordic_ble_payload_length = -1;
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2016-12-14 09:17:42 +00:00
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static int hf_nordic_ble_protover = -1;
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2016-07-21 07:55:03 +00:00
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static int hf_nordic_ble_packet_counter = -1;
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2016-12-14 09:17:42 +00:00
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static int hf_nordic_ble_packet_id = -1;
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static int hf_nordic_ble_packet_length = -1;
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2016-07-21 07:55:03 +00:00
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static int hf_nordic_ble_flags = -1;
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static int hf_nordic_ble_crcok = -1;
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static int hf_nordic_ble_encrypted = -1;
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static int hf_nordic_ble_micok = -1;
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2018-03-13 08:28:15 +00:00
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static int hf_nordic_ble_mic_not_relevant = -1;
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static int hf_nordic_ble_le_phy = -1;
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static int hf_nordic_ble_rfu = -1;
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2016-07-21 07:55:03 +00:00
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static int hf_nordic_ble_direction = -1;
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static int hf_nordic_ble_channel = -1;
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static int hf_nordic_ble_rssi = -1;
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static int hf_nordic_ble_event_counter = -1;
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static int hf_nordic_ble_delta_time = -1;
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static int hf_nordic_ble_delta_time_ss = -1;
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static expert_field ei_nordic_ble_bad_crc = EI_INIT;
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static expert_field ei_nordic_ble_bad_mic = EI_INIT;
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static expert_field ei_nordic_ble_bad_length = EI_INIT;
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2018-03-13 08:28:15 +00:00
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static expert_field ei_nordic_ble_unknown_version = EI_INIT;
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2016-07-21 07:55:03 +00:00
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static const true_false_string direction_tfs =
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{
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"Master -> Slave",
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"Slave -> Master"
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};
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2016-12-14 09:17:42 +00:00
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2016-07-21 07:55:03 +00:00
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static const true_false_string ok_incorrect =
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{
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"OK",
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"Incorrect"
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};
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2018-03-13 08:28:15 +00:00
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static const true_false_string not_relevant =
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{
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"Only relevant when encrypted",
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"Only relevant when encrypted"
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};
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static const value_string le_phys[] =
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{
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{ 0, "LE 1M" },
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{ 1, "LE 2M" },
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{ 2, "LE Coded" },
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{ 3, "Reserved" },
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{ 4, "Reserved" },
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{ 5, "Reserved" },
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{ 6, "Reserved" },
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{ 7, "Reserved" },
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{ 0, NULL }
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};
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#define LE_1M_PHY 0
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#define LE_2M_PHY 1
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#define LE_CODED_PHY 2
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typedef struct {
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guint8 protover;
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guint8 phy;
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gboolean bad_length;
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guint16 payload_length;
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guint16 event_packet_length;
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} nordic_ble_context_t;
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2016-07-21 07:55:03 +00:00
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/* next dissector */
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static dissector_handle_t btle_dissector_handle = NULL;
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static dissector_handle_t debug_handle = NULL;
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2016-12-14 09:17:42 +00:00
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static gint
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2018-03-13 08:28:15 +00:00
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dissect_lengths(tvbuff_t *tvb, gint offset, packet_info *pinfo, proto_tree *tree, nordic_ble_context_t *nordic_ble_context)
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2016-07-21 07:55:03 +00:00
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{
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2018-03-13 08:28:15 +00:00
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guint32 hlen, plen;
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2016-07-21 07:55:03 +00:00
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proto_item* item;
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2018-03-13 08:28:15 +00:00
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switch (nordic_ble_context->protover) {
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case 0: /* Legacy version */
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hlen = 2 + UART_HEADER_LEN; /* 2 bytes legacy marker + UART header */
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item = proto_tree_add_item_ret_uint(tree, hf_nordic_ble_payload_length, tvb, offset, 1, ENC_NA, &plen);
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2016-12-14 19:27:54 +00:00
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offset += 1;
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2018-03-13 08:28:15 +00:00
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break;
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2016-07-21 07:55:03 +00:00
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2018-03-13 08:28:15 +00:00
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case 1:
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proto_tree_add_item_ret_uint(tree, hf_nordic_ble_header_length, tvb, offset, 1, ENC_NA, &hlen);
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hlen += 1; /* Add one byte for board id */
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offset += 1;
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2016-07-21 07:55:03 +00:00
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2018-03-13 08:28:15 +00:00
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item = proto_tree_add_item_ret_uint(tree, hf_nordic_ble_payload_length, tvb, offset, 1, ENC_NA, &plen);
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offset += 1;
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break;
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case 2:
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hlen = 1 + UART_HEADER_LEN; /* Board ID + UART header */
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item = proto_tree_add_item_ret_uint(tree, hf_nordic_ble_payload_length, tvb, offset, 2, ENC_LITTLE_ENDIAN, &plen);
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offset += 2;
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break;
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default:
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return offset;
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}
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if ((hlen + plen) != tvb_captured_length(tvb)) {
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2016-07-21 07:55:03 +00:00
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expert_add_info(pinfo, item, &ei_nordic_ble_bad_length);
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2018-03-13 08:28:15 +00:00
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nordic_ble_context->bad_length = TRUE;
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2016-07-21 07:55:03 +00:00
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}
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2018-03-13 08:28:15 +00:00
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nordic_ble_context->payload_length = plen;
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2016-12-14 19:27:54 +00:00
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2016-12-14 09:17:42 +00:00
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return offset;
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2016-07-21 07:55:03 +00:00
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}
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2016-12-14 09:17:42 +00:00
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static gint
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2018-03-13 08:28:15 +00:00
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dissect_flags(tvbuff_t *tvb, gint offset, packet_info *pinfo, proto_tree *tree, nordic_ble_context_t *nordic_ble_context, btle_context_t *context)
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2016-07-21 07:55:03 +00:00
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{
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guint8 flags;
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2016-08-02 11:54:46 +00:00
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gboolean dir, encrypted;
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2016-08-09 19:59:30 +00:00
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proto_item *flags_item, *item;
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proto_tree *flags_tree;
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2016-07-21 07:55:03 +00:00
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2016-08-02 11:54:46 +00:00
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context->crc_checked_at_capture = 1;
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2016-12-14 09:17:42 +00:00
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flags = tvb_get_guint8(tvb, offset);
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2016-08-02 11:54:46 +00:00
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context->crc_valid_at_capture = !!(flags & 1);
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2016-07-21 07:55:03 +00:00
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dir = !!(flags & 2);
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encrypted = !!(flags & 4);
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2016-08-02 11:54:46 +00:00
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context->mic_valid_at_capture = !!(flags & 8);
|
2018-03-13 08:28:15 +00:00
|
|
|
nordic_ble_context->phy = (flags >> 4) & 7;
|
2016-07-21 07:55:03 +00:00
|
|
|
|
|
|
|
if (dir) {
|
|
|
|
set_address(&pinfo->src, AT_STRINGZ, 7, "Master");
|
|
|
|
set_address(&pinfo->dst, AT_STRINGZ, 6, "Slave");
|
2016-08-02 15:07:14 +00:00
|
|
|
context->direction = BTLE_DIR_MASTER_SLAVE;
|
2016-08-04 13:56:19 +00:00
|
|
|
pinfo->p2p_dir = P2P_DIR_SENT;
|
2018-03-13 08:28:15 +00:00
|
|
|
} else {
|
2016-07-21 07:55:03 +00:00
|
|
|
set_address(&pinfo->src, AT_STRINGZ, 6, "Slave");
|
|
|
|
set_address(&pinfo->dst, AT_STRINGZ, 7, "Master");
|
2016-08-02 15:07:14 +00:00
|
|
|
context->direction = BTLE_DIR_SLAVE_MASTER;
|
2016-08-04 13:56:19 +00:00
|
|
|
pinfo->p2p_dir = P2P_DIR_RECV;
|
2016-07-21 07:55:03 +00:00
|
|
|
}
|
|
|
|
|
2016-12-14 09:17:42 +00:00
|
|
|
flags_item = proto_tree_add_item(tree, hf_nordic_ble_flags, tvb, offset, 1, ENC_NA);
|
2016-08-09 19:59:30 +00:00
|
|
|
flags_tree = proto_item_add_subtree(flags_item, ett_flags);
|
2018-03-13 08:28:15 +00:00
|
|
|
item = proto_tree_add_item(flags_tree, hf_nordic_ble_crcok, tvb, offset, 1, ENC_NA);
|
|
|
|
if (!context->crc_valid_at_capture) {
|
|
|
|
/* CRC is bad */
|
|
|
|
expert_add_info(pinfo, item, &ei_nordic_ble_bad_crc);
|
|
|
|
}
|
|
|
|
proto_tree_add_item(flags_tree, hf_nordic_ble_direction, tvb, offset, 1, ENC_NA);
|
|
|
|
proto_tree_add_item(flags_tree, hf_nordic_ble_encrypted, tvb, offset, 1, ENC_NA);
|
2016-07-21 07:55:03 +00:00
|
|
|
if (encrypted) /* if encrypted, add MIC status */
|
|
|
|
{
|
2016-08-02 11:54:46 +00:00
|
|
|
context->mic_checked_at_capture = 1;
|
2018-03-13 08:28:15 +00:00
|
|
|
item = proto_tree_add_item(flags_tree, hf_nordic_ble_micok, tvb, offset, 1, ENC_NA);
|
2016-08-02 11:54:46 +00:00
|
|
|
if (!context->mic_valid_at_capture) {
|
2016-07-21 07:55:03 +00:00
|
|
|
/* MIC is bad */
|
|
|
|
expert_add_info(pinfo, item, &ei_nordic_ble_bad_mic);
|
|
|
|
}
|
2018-03-13 08:28:15 +00:00
|
|
|
} else {
|
|
|
|
proto_tree_add_item(flags_tree, hf_nordic_ble_mic_not_relevant, tvb, offset, 1, ENC_NA);
|
2016-07-21 07:55:03 +00:00
|
|
|
}
|
2018-03-13 08:28:15 +00:00
|
|
|
proto_tree_add_item(flags_tree, hf_nordic_ble_le_phy, tvb, offset, 1, ENC_NA);
|
|
|
|
proto_tree_add_item(flags_tree, hf_nordic_ble_rfu, tvb, offset, 1, ENC_NA);
|
2016-12-14 09:17:42 +00:00
|
|
|
offset++;
|
2016-07-21 07:55:03 +00:00
|
|
|
|
2016-12-14 09:17:42 +00:00
|
|
|
return offset;
|
2016-07-21 07:55:03 +00:00
|
|
|
}
|
|
|
|
|
2016-12-14 09:17:42 +00:00
|
|
|
static gint
|
2018-03-13 08:28:15 +00:00
|
|
|
dissect_ble_delta_time(tvbuff_t *tvb, gint offset, packet_info *pinfo, proto_tree *tree, nordic_ble_context_t *nordic_ble_context)
|
2016-07-21 07:55:03 +00:00
|
|
|
{
|
2018-03-13 08:28:15 +00:00
|
|
|
static guint32 previous_ble_packet_time;
|
|
|
|
guint32 delta_time, delta_time_ss, prev_packet_time;
|
2017-08-24 07:51:04 +00:00
|
|
|
proto_item *pi;
|
|
|
|
|
2018-03-13 08:28:15 +00:00
|
|
|
/* end-to-start */
|
|
|
|
proto_tree_add_item_ret_uint(tree, hf_nordic_ble_delta_time, tvb, offset, 4, ENC_LITTLE_ENDIAN, &delta_time);
|
|
|
|
|
2017-08-24 07:51:04 +00:00
|
|
|
if (!pinfo->fd->flags.visited) {
|
2018-03-13 08:28:15 +00:00
|
|
|
/* First time visiting this packet, store previous BLE packet time */
|
|
|
|
p_add_proto_data(wmem_file_scope(), pinfo, proto_nordic_ble, 0, GUINT_TO_POINTER(previous_ble_packet_time));
|
|
|
|
prev_packet_time = previous_ble_packet_time;
|
2017-08-24 07:51:04 +00:00
|
|
|
} else {
|
2018-03-13 08:28:15 +00:00
|
|
|
prev_packet_time = GPOINTER_TO_UINT(p_get_proto_data(wmem_file_scope(), pinfo, proto_nordic_ble, 0));
|
2017-08-24 07:51:04 +00:00
|
|
|
}
|
2016-07-21 07:55:03 +00:00
|
|
|
|
2018-03-13 08:28:15 +00:00
|
|
|
if (pinfo->num > 1) {
|
|
|
|
/* Calculated start-to-start is not valid for the first packet because we don't have the previous packet */
|
|
|
|
delta_time_ss = prev_packet_time + delta_time;
|
|
|
|
pi = proto_tree_add_uint(tree, hf_nordic_ble_delta_time_ss, tvb, offset, 4, delta_time_ss);
|
|
|
|
PROTO_ITEM_SET_GENERATED(pi);
|
|
|
|
}
|
|
|
|
offset += 4;
|
2016-07-21 07:55:03 +00:00
|
|
|
|
2017-08-24 07:51:04 +00:00
|
|
|
if (!pinfo->fd->flags.visited) {
|
2018-03-13 08:28:15 +00:00
|
|
|
/* Calculate packet time according to this packets PHY */
|
|
|
|
guint16 ble_payload_length = nordic_ble_context->payload_length - nordic_ble_context->event_packet_length;
|
|
|
|
if (nordic_ble_context->phy == LE_1M_PHY) {
|
|
|
|
previous_ble_packet_time = US_PER_BYTE_1M_PHY * (PREAMBLE_LEN_1M_PHY + ble_payload_length);
|
|
|
|
} else if (nordic_ble_context->phy == LE_2M_PHY) {
|
|
|
|
previous_ble_packet_time = US_PER_BYTE_2M_PHY * (PREAMBLE_LEN_2M_PHY + ble_payload_length);
|
|
|
|
} else {
|
|
|
|
previous_ble_packet_time = 0; /* Unknown */
|
|
|
|
}
|
2017-08-24 07:51:04 +00:00
|
|
|
}
|
2016-07-21 07:55:03 +00:00
|
|
|
|
2016-12-14 09:17:42 +00:00
|
|
|
return offset;
|
|
|
|
}
|
2016-07-21 07:55:03 +00:00
|
|
|
|
2016-12-14 09:17:42 +00:00
|
|
|
static gint
|
2016-12-14 19:27:54 +00:00
|
|
|
dissect_packet_counter(tvbuff_t *tvb, gint offset, proto_item *item, proto_tree *tree)
|
|
|
|
{
|
|
|
|
proto_item_append_text(item, ", Packet counter: %u", tvb_get_guint16(tvb, offset, ENC_LITTLE_ENDIAN));
|
|
|
|
proto_tree_add_item(tree, hf_nordic_ble_packet_counter, tvb, offset, 2, ENC_LITTLE_ENDIAN);
|
|
|
|
offset += 2;
|
|
|
|
|
|
|
|
return offset;
|
|
|
|
}
|
|
|
|
|
|
|
|
static gint
|
2018-03-13 08:28:15 +00:00
|
|
|
dissect_packet_header(tvbuff_t *tvb, gint offset, packet_info *pinfo, proto_tree *tree, nordic_ble_context_t *nordic_ble_context)
|
2016-07-21 07:55:03 +00:00
|
|
|
{
|
2016-12-14 09:17:42 +00:00
|
|
|
proto_item *ti;
|
|
|
|
proto_tree *header_tree;
|
2016-12-14 19:27:54 +00:00
|
|
|
gint start_offset = offset;
|
2016-07-21 07:55:03 +00:00
|
|
|
|
2016-12-14 19:27:54 +00:00
|
|
|
ti = proto_tree_add_item(tree, hf_nordic_ble_header, tvb, offset, -1, ENC_NA);
|
2016-12-14 09:17:42 +00:00
|
|
|
header_tree = proto_item_add_subtree(ti, ett_packet_header);
|
2018-03-13 08:28:15 +00:00
|
|
|
proto_item_append_text(ti, " Version: %u", nordic_ble_context->protover);
|
|
|
|
|
|
|
|
if (nordic_ble_context->protover == 0) {
|
|
|
|
proto_item *item = proto_tree_add_uint(header_tree, hf_nordic_ble_protover, tvb, 0, 0, 0);
|
|
|
|
PROTO_ITEM_SET_GENERATED(item);
|
2016-07-21 07:55:03 +00:00
|
|
|
|
2016-12-14 19:27:54 +00:00
|
|
|
proto_tree_add_item(header_tree, hf_nordic_ble_packet_id, tvb, offset, 1, ENC_NA);
|
|
|
|
offset += 1;
|
2016-07-21 07:55:03 +00:00
|
|
|
|
2016-12-14 19:27:54 +00:00
|
|
|
offset = dissect_packet_counter(tvb, offset, ti, header_tree);
|
2016-07-21 07:55:03 +00:00
|
|
|
|
2016-12-14 19:27:54 +00:00
|
|
|
offset += 2; // Two unused bytes
|
|
|
|
}
|
2016-07-21 07:55:03 +00:00
|
|
|
|
2018-03-13 08:28:15 +00:00
|
|
|
offset = dissect_lengths(tvb, offset, pinfo, header_tree, nordic_ble_context);
|
2016-07-21 07:55:03 +00:00
|
|
|
|
2018-03-13 08:28:15 +00:00
|
|
|
if (nordic_ble_context->protover != 0) {
|
|
|
|
proto_item *item = proto_tree_add_item(header_tree, hf_nordic_ble_protover, tvb, offset, 1, ENC_NA);
|
2016-12-14 19:27:54 +00:00
|
|
|
offset += 1;
|
2018-03-13 08:28:15 +00:00
|
|
|
if (nordic_ble_context->protover > 2) {
|
|
|
|
expert_add_info(pinfo, item, &ei_nordic_ble_unknown_version);
|
|
|
|
}
|
2016-12-14 19:27:54 +00:00
|
|
|
|
|
|
|
offset = dissect_packet_counter(tvb, offset, ti, header_tree);
|
|
|
|
|
|
|
|
proto_tree_add_item(header_tree, hf_nordic_ble_packet_id, tvb, offset, 1, ENC_NA);
|
|
|
|
offset += 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
proto_item_set_len(ti, offset - start_offset);
|
2016-07-21 07:55:03 +00:00
|
|
|
|
2016-12-14 09:17:42 +00:00
|
|
|
return offset;
|
|
|
|
}
|
|
|
|
|
|
|
|
static gint
|
2018-03-13 08:28:15 +00:00
|
|
|
dissect_packet(tvbuff_t *tvb, gint offset, packet_info *pinfo, proto_tree *tree, nordic_ble_context_t *nordic_ble_context, btle_context_t *context)
|
2016-07-21 07:55:03 +00:00
|
|
|
{
|
2016-12-14 09:17:42 +00:00
|
|
|
gint32 rssi;
|
2016-07-21 07:55:03 +00:00
|
|
|
|
2018-03-13 08:28:15 +00:00
|
|
|
if (nordic_ble_context->protover == 0) {
|
|
|
|
// Event packet length is fixed for the legacy version
|
|
|
|
nordic_ble_context->event_packet_length = EVENT_PACKET_LEN;
|
|
|
|
} else {
|
|
|
|
guint32 plen;
|
|
|
|
proto_tree_add_item_ret_uint(tree, hf_nordic_ble_packet_length, tvb, offset, 1, ENC_NA, &plen);
|
|
|
|
nordic_ble_context->event_packet_length = plen;
|
2017-08-19 21:59:02 +00:00
|
|
|
offset += 1;
|
|
|
|
}
|
2017-08-19 20:02:43 +00:00
|
|
|
|
2018-03-13 08:28:15 +00:00
|
|
|
offset = dissect_flags(tvb, offset, pinfo, tree, nordic_ble_context, context);
|
2016-07-21 07:55:03 +00:00
|
|
|
|
2016-12-14 09:17:42 +00:00
|
|
|
proto_tree_add_item(tree, hf_nordic_ble_channel, tvb, offset, 1, ENC_NA);
|
|
|
|
offset += 1;
|
|
|
|
|
|
|
|
rssi = (-1)*((gint32)tvb_get_guint8(tvb, offset));
|
|
|
|
proto_tree_add_int(tree, hf_nordic_ble_rssi, tvb, offset, 1, rssi);
|
|
|
|
offset += 1;
|
2016-07-21 07:55:03 +00:00
|
|
|
|
2016-12-14 09:17:42 +00:00
|
|
|
proto_tree_add_item(tree, hf_nordic_ble_event_counter, tvb, offset, 2, ENC_LITTLE_ENDIAN);
|
|
|
|
offset += 2;
|
2016-07-21 07:55:03 +00:00
|
|
|
|
2018-03-13 08:28:15 +00:00
|
|
|
offset = dissect_ble_delta_time(tvb, offset, pinfo, tree, nordic_ble_context);
|
2016-07-21 07:55:03 +00:00
|
|
|
|
2016-12-14 09:17:42 +00:00
|
|
|
return offset;
|
2016-07-21 07:55:03 +00:00
|
|
|
}
|
|
|
|
|
2016-12-14 09:17:42 +00:00
|
|
|
static gint
|
|
|
|
dissect_header(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, btle_context_t *context, gboolean *bad_length)
|
2016-07-21 07:55:03 +00:00
|
|
|
{
|
|
|
|
proto_item *ti;
|
|
|
|
proto_tree *nordic_ble_tree;
|
2016-12-14 09:17:42 +00:00
|
|
|
gint offset = 0;
|
2018-03-13 08:28:15 +00:00
|
|
|
nordic_ble_context_t nordic_ble_context;
|
|
|
|
|
|
|
|
memset(&nordic_ble_context, 0, sizeof(nordic_ble_context));
|
2016-07-21 07:55:03 +00:00
|
|
|
|
|
|
|
ti = proto_tree_add_item(tree, proto_nordic_ble, tvb, 0, -1, ENC_NA);
|
|
|
|
nordic_ble_tree = proto_item_add_subtree(ti, ett_nordic_ble);
|
|
|
|
|
2018-03-13 08:28:15 +00:00
|
|
|
if (tvb_get_guint16(tvb, 0, ENC_BIG_ENDIAN) == 0xBEEF) {
|
2016-12-14 19:27:54 +00:00
|
|
|
proto_tree_add_item(nordic_ble_tree, hf_nordic_ble_legacy_marker, tvb, 0, 2, ENC_BIG_ENDIAN);
|
|
|
|
offset += 2;
|
2018-03-13 08:28:15 +00:00
|
|
|
|
|
|
|
nordic_ble_context.protover = 0; /* Legacy Version */
|
2016-12-14 19:27:54 +00:00
|
|
|
} else {
|
|
|
|
proto_tree_add_item(nordic_ble_tree, hf_nordic_ble_board_id, tvb, 0, 1, ENC_NA);
|
|
|
|
offset += 1;
|
2018-03-13 08:28:15 +00:00
|
|
|
|
|
|
|
nordic_ble_context.protover = tvb_get_guint8(tvb, offset + 2);
|
2016-12-14 19:27:54 +00:00
|
|
|
}
|
2016-07-21 07:55:03 +00:00
|
|
|
|
2018-03-13 08:28:15 +00:00
|
|
|
offset = dissect_packet_header(tvb, offset, pinfo, nordic_ble_tree, &nordic_ble_context);
|
|
|
|
offset = dissect_packet(tvb, offset, pinfo, nordic_ble_tree, &nordic_ble_context, context);
|
2016-07-21 07:55:03 +00:00
|
|
|
|
2016-12-14 09:17:42 +00:00
|
|
|
proto_item_set_len(ti, offset);
|
2018-03-13 08:28:15 +00:00
|
|
|
*bad_length = nordic_ble_context.bad_length;
|
2016-07-21 07:55:03 +00:00
|
|
|
|
2016-12-14 09:17:42 +00:00
|
|
|
return offset;
|
2016-07-21 07:55:03 +00:00
|
|
|
}
|
|
|
|
|
2016-12-14 09:17:42 +00:00
|
|
|
/* Main entry point for sniffer */
|
2016-07-21 07:55:03 +00:00
|
|
|
static int
|
2016-08-02 11:54:46 +00:00
|
|
|
dissect_nordic_ble(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
|
2016-07-21 07:55:03 +00:00
|
|
|
{
|
2016-08-02 11:54:46 +00:00
|
|
|
tvbuff_t *payload_tvb;
|
|
|
|
btle_context_t *context;
|
2016-12-14 09:17:42 +00:00
|
|
|
gint offset;
|
|
|
|
gboolean bad_length = FALSE;
|
2016-07-21 07:55:03 +00:00
|
|
|
|
2016-08-02 11:54:46 +00:00
|
|
|
context = wmem_new0(wmem_packet_scope(), btle_context_t);
|
2016-07-21 07:55:03 +00:00
|
|
|
|
2016-12-14 09:17:42 +00:00
|
|
|
offset = dissect_header(tvb, pinfo, tree, context, &bad_length);
|
2017-01-10 06:18:49 +00:00
|
|
|
payload_tvb = tvb_new_subset_length_caplen(tvb, offset, -1, tvb_captured_length(tvb) - offset);
|
2016-07-21 07:55:03 +00:00
|
|
|
|
2016-12-14 09:17:42 +00:00
|
|
|
if (!bad_length) {
|
2016-08-02 11:54:46 +00:00
|
|
|
call_dissector_with_data(btle_dissector_handle, payload_tvb, pinfo, tree, context);
|
2016-07-21 07:55:03 +00:00
|
|
|
}
|
|
|
|
|
2016-08-02 11:54:46 +00:00
|
|
|
if ((context->mic_checked_at_capture) && (!context->mic_valid_at_capture)) {
|
2016-07-21 07:55:03 +00:00
|
|
|
col_add_str(pinfo->cinfo, COL_INFO, "Encrypted packet decrypted incorrectly (bad MIC)");
|
|
|
|
}
|
|
|
|
|
|
|
|
if (debug_handle) {
|
|
|
|
call_dissector(debug_handle, payload_tvb, pinfo, tree);
|
|
|
|
}
|
|
|
|
|
2016-12-14 09:17:42 +00:00
|
|
|
return offset;
|
2016-07-21 07:55:03 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
void
|
|
|
|
proto_register_nordic_ble(void)
|
|
|
|
{
|
|
|
|
static hf_register_info hf[] = {
|
2016-12-14 09:17:42 +00:00
|
|
|
{ &hf_nordic_ble_board_id,
|
|
|
|
{ "Board", "nordic_ble.board_id",
|
|
|
|
FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
|
|
NULL, HFILL }
|
|
|
|
},
|
2016-12-14 19:27:54 +00:00
|
|
|
{ &hf_nordic_ble_legacy_marker,
|
|
|
|
{ "Legacy marker", "nordic_ble.legacy_marker",
|
|
|
|
FT_UINT16, BASE_HEX, NULL, 0x0,
|
|
|
|
NULL, HFILL }
|
|
|
|
},
|
2016-12-14 09:17:42 +00:00
|
|
|
{ &hf_nordic_ble_header,
|
|
|
|
{ "Header", "nordic_ble.header",
|
|
|
|
FT_NONE, BASE_NONE, NULL, 0x0,
|
|
|
|
NULL, HFILL }
|
|
|
|
},
|
|
|
|
{ &hf_nordic_ble_header_length,
|
|
|
|
{ "Length of header", "nordic_ble.hlen",
|
|
|
|
FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
|
|
NULL, HFILL }
|
|
|
|
},
|
|
|
|
{ &hf_nordic_ble_payload_length,
|
|
|
|
{ "Length of payload", "nordic_ble.plen",
|
2018-03-13 08:28:15 +00:00
|
|
|
FT_UINT16, BASE_DEC, NULL, 0x0,
|
2016-12-14 09:17:42 +00:00
|
|
|
"Payload length", HFILL }
|
|
|
|
},
|
|
|
|
{ &hf_nordic_ble_protover,
|
|
|
|
{ "Protocol version", "nordic_ble.protover",
|
|
|
|
FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
|
|
NULL, HFILL }
|
|
|
|
},
|
|
|
|
{ &hf_nordic_ble_packet_counter,
|
|
|
|
{ "Packet counter", "nordic_ble.packet_counter",
|
|
|
|
FT_UINT16, BASE_DEC, NULL, 0x0,
|
|
|
|
"Global packet counter for packets sent on UART", HFILL }
|
|
|
|
},
|
|
|
|
{ &hf_nordic_ble_packet_id,
|
|
|
|
{ "Packet ID", "nordic_ble.packet_id",
|
|
|
|
FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
|
|
NULL, HFILL }
|
|
|
|
},
|
|
|
|
{ &hf_nordic_ble_packet_length,
|
|
|
|
{ "Length of packet", "nordic_ble.len",
|
2018-03-13 08:28:15 +00:00
|
|
|
FT_UINT16, BASE_DEC, NULL, 0x0,
|
2016-12-14 09:17:42 +00:00
|
|
|
NULL, HFILL }
|
|
|
|
},
|
|
|
|
{ &hf_nordic_ble_flags,
|
|
|
|
{ "Flags", "nordic_ble.flags",
|
|
|
|
FT_UINT8, BASE_HEX, NULL, 0x0,
|
|
|
|
NULL, HFILL }
|
|
|
|
},
|
|
|
|
{ &hf_nordic_ble_crcok,
|
|
|
|
{ "CRC", "nordic_ble.crcok",
|
2018-03-13 08:28:15 +00:00
|
|
|
FT_BOOLEAN, 8, TFS(&ok_incorrect), 0x01,
|
2016-12-14 09:17:42 +00:00
|
|
|
"Cyclic Redundancy Check state", HFILL }
|
|
|
|
},
|
|
|
|
{ &hf_nordic_ble_direction,
|
|
|
|
{ "Direction", "nordic_ble.direction",
|
2018-03-13 08:28:15 +00:00
|
|
|
FT_BOOLEAN, 8, TFS(&direction_tfs), 0x02,
|
2016-12-14 09:17:42 +00:00
|
|
|
NULL, HFILL }
|
|
|
|
},
|
|
|
|
{ &hf_nordic_ble_encrypted,
|
|
|
|
{ "Encrypted", "nordic_ble.encrypted",
|
2018-03-13 08:28:15 +00:00
|
|
|
FT_BOOLEAN, 8, TFS(&tfs_yes_no), 0x04,
|
2016-12-14 09:17:42 +00:00
|
|
|
"Was the packet encrypted", HFILL }
|
|
|
|
},
|
|
|
|
{ &hf_nordic_ble_micok,
|
|
|
|
{ "MIC", "nordic_ble.micok",
|
2018-03-13 08:28:15 +00:00
|
|
|
FT_BOOLEAN, 8, TFS(&ok_incorrect), 0x08,
|
2016-12-14 09:17:42 +00:00
|
|
|
"Message Integrity Check state", HFILL }
|
|
|
|
},
|
2018-03-13 08:28:15 +00:00
|
|
|
{ &hf_nordic_ble_mic_not_relevant,
|
|
|
|
{ "MIC", "nordic_ble.mic_not_relevant",
|
|
|
|
FT_BOOLEAN, 8, TFS(¬_relevant), 0x08,
|
|
|
|
"Message Integrity Check state", HFILL }
|
|
|
|
},
|
|
|
|
{ &hf_nordic_ble_le_phy,
|
|
|
|
{ "PHY", "nordic_ble.phy",
|
|
|
|
FT_UINT8, BASE_NONE, VALS(le_phys), 0x70,
|
|
|
|
"Physical Layer", HFILL }
|
|
|
|
},
|
|
|
|
{ &hf_nordic_ble_rfu,
|
|
|
|
{ "RFU", "nordic_ble.rfu",
|
|
|
|
FT_UINT8, BASE_DEC, NULL, 0x80,
|
|
|
|
"Reserved for Future Use", HFILL }
|
|
|
|
},
|
2016-12-14 09:17:42 +00:00
|
|
|
{ &hf_nordic_ble_channel,
|
|
|
|
{ "Channel", "nordic_ble.channel",
|
|
|
|
FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
|
|
NULL, HFILL }
|
|
|
|
},
|
|
|
|
{ &hf_nordic_ble_rssi,
|
|
|
|
{ "RSSI (dBm)", "nordic_ble.rssi",
|
|
|
|
FT_INT16, BASE_DEC, NULL, 0x0,
|
|
|
|
"Received Signal Strength Indicator", HFILL }
|
|
|
|
},
|
|
|
|
{ &hf_nordic_ble_event_counter,
|
|
|
|
{ "Event counter", "nordic_ble.event_counter",
|
|
|
|
FT_UINT16, BASE_DEC, NULL, 0x0,
|
|
|
|
NULL, HFILL }
|
|
|
|
},
|
|
|
|
{ &hf_nordic_ble_delta_time,
|
2017-08-24 07:51:04 +00:00
|
|
|
{ "Delta time (" UTF8_MICRO_SIGN "s end to start)", "nordic_ble.delta_time",
|
2016-12-14 09:17:42 +00:00
|
|
|
FT_UINT32, BASE_DEC, NULL, 0x0,
|
2017-08-24 07:51:04 +00:00
|
|
|
UTF8_MICRO_SIGN "s since end of last reported packet", HFILL }
|
2016-12-14 09:17:42 +00:00
|
|
|
},
|
|
|
|
{ &hf_nordic_ble_delta_time_ss,
|
2017-08-24 07:51:04 +00:00
|
|
|
{ "Delta time (" UTF8_MICRO_SIGN "s start to start)", "nordic_ble.delta_time_ss",
|
2016-12-14 09:17:42 +00:00
|
|
|
FT_UINT32, BASE_DEC, NULL, 0x0,
|
2017-08-24 07:51:04 +00:00
|
|
|
UTF8_MICRO_SIGN "s since start of last reported packet", HFILL }
|
2016-12-14 09:17:42 +00:00
|
|
|
}
|
2016-07-21 07:55:03 +00:00
|
|
|
};
|
|
|
|
|
|
|
|
static gint *ett[] = {
|
|
|
|
&ett_nordic_ble,
|
2016-12-14 09:17:42 +00:00
|
|
|
&ett_packet_header,
|
2016-07-21 07:55:03 +00:00
|
|
|
&ett_flags
|
|
|
|
};
|
|
|
|
|
2016-12-14 09:17:42 +00:00
|
|
|
static ei_register_info ei[] = {
|
|
|
|
{ &ei_nordic_ble_bad_crc, { "nordic_ble.crc.bad", PI_CHECKSUM, PI_ERROR, "CRC is bad", EXPFILL }},
|
|
|
|
{ &ei_nordic_ble_bad_mic, { "nordic_ble.mic.bad", PI_CHECKSUM, PI_ERROR, "MIC is bad", EXPFILL }},
|
|
|
|
{ &ei_nordic_ble_bad_length, { "nordic_ble.length.bad", PI_MALFORMED, PI_ERROR, "Length is incorrect", EXPFILL }},
|
2018-03-13 08:28:15 +00:00
|
|
|
{ &ei_nordic_ble_unknown_version, { "nordic_ble.protover.bad", PI_PROTOCOL, PI_ERROR, "Unknown version", EXPFILL }},
|
2016-12-14 09:17:42 +00:00
|
|
|
};
|
|
|
|
|
|
|
|
expert_module_t *expert_nordic_ble;
|
2016-07-21 07:55:03 +00:00
|
|
|
|
2017-08-24 07:51:04 +00:00
|
|
|
proto_nordic_ble = proto_register_protocol("Nordic BLE Sniffer", "NORDIC_BLE", "nordic_ble");
|
2016-07-21 07:55:03 +00:00
|
|
|
|
|
|
|
register_dissector("nordic_ble", dissect_nordic_ble, proto_nordic_ble);
|
|
|
|
|
|
|
|
expert_nordic_ble = expert_register_protocol(proto_nordic_ble);
|
|
|
|
expert_register_field_array(expert_nordic_ble, ei, array_length(ei));
|
|
|
|
|
|
|
|
proto_register_field_array(proto_nordic_ble, hf, array_length(hf));
|
|
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
|
|
}
|
|
|
|
|
|
|
|
void
|
|
|
|
proto_reg_handoff_nordic_ble(void)
|
|
|
|
{
|
2016-10-05 20:33:54 +00:00
|
|
|
dissector_handle_t nordic_ble_handle;
|
2016-07-21 07:55:03 +00:00
|
|
|
|
2016-10-05 20:33:54 +00:00
|
|
|
nordic_ble_handle = create_dissector_handle(dissect_nordic_ble, proto_nordic_ble);
|
2016-07-21 07:55:03 +00:00
|
|
|
|
2016-10-05 20:33:54 +00:00
|
|
|
btle_dissector_handle = find_dissector("btle");
|
|
|
|
debug_handle = find_dissector("nordic_debug");
|
2016-07-21 07:55:03 +00:00
|
|
|
|
2016-10-05 20:33:54 +00:00
|
|
|
dissector_add_for_decode_as_with_preference("udp.port", nordic_ble_handle);
|
2017-08-26 09:21:52 +00:00
|
|
|
dissector_add_uint("wtap_encap", WTAP_ENCAP_NORDIC_BLE, nordic_ble_handle);
|
2016-07-21 07:55:03 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Editor modelines - http://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:
|
|
|
|
*/
|