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/* packet-btle_rf.c
* http://www.whiterocker.com/bt/LINKTYPE_BLUETOOTH_LE_LL_WITH_PHDR.html
*
* Copyright 2014, Christopher D. Kilgour, techie at whiterocker dot com
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "config.h"
#include <epan/packet.h>
#include <wiretap/wtap.h>
#include "packet-btle.h"
#define LE_DEWHITENED 0x0001
#define LE_SIGPOWER_VALID 0x0002
#define LE_NOISEPOWER_VALID 0x0004
#define LE_PACKET_DECRYPTED 0x0008
#define LE_REF_AA_VALID 0x0010
#define LE_AA_OFFENSES_VALID 0x0020
#define LE_CHANNEL_ALIASED 0x0040
#define LE_CRC_CHECKED 0x0400
#define LE_CRC_VALID 0x0800
#define LE_MIC_CHECKED 0x1000
#define LE_MIC_VALID 0x2000
#define BTLE_RF_OCTETS 10
static int proto_btle_rf = -1;
static int hf_btle_rf_signed_byte_unused = -1;
static int hf_btle_rf_unsigned_byte_unused = -1;
static int hf_btle_rf_word_unused = -1;
static int hf_btle_rf_channel = -1;
static int hf_btle_rf_signal_dbm = -1;
static int hf_btle_rf_noise_dbm = -1;
static int hf_btle_rf_access_address_offenses = -1;
static int hf_btle_rf_reference_access_address = -1;
static int hf_btle_rf_flags = -1;
static int hf_btle_rf_dewhitened_flag = -1;
static int hf_btle_rf_sigpower_valid_flag = -1;
static int hf_btle_rf_noisepower_valid_flag = -1;
static int hf_btle_rf_packet_decrypted_flag = -1;
static int hf_btle_rf_ref_aa_valid_flag = -1;
static int hf_btle_rf_aa_offenses_valid_flag = -1;
static int hf_btle_rf_channel_aliased_flag = -1;
static int hf_btle_rf_flags_rfu_1 = -1;
static int hf_btle_rf_crc_checked_flag = -1;
static int hf_btle_rf_crc_valid_flag = -1;
static int hf_btle_rf_mic_checked_flag = -1;
static int hf_btle_rf_mic_valid_flag = -1;
static int hf_btle_rf_flags_rfu_2 = -1;
static const int *hfs_btle_rf_flags[] = {
&hf_btle_rf_dewhitened_flag,
&hf_btle_rf_sigpower_valid_flag,
&hf_btle_rf_noisepower_valid_flag,
&hf_btle_rf_packet_decrypted_flag,
&hf_btle_rf_ref_aa_valid_flag,
&hf_btle_rf_aa_offenses_valid_flag,
&hf_btle_rf_channel_aliased_flag,
&hf_btle_rf_flags_rfu_1,
&hf_btle_rf_crc_checked_flag,
&hf_btle_rf_crc_valid_flag,
&hf_btle_rf_mic_checked_flag,
&hf_btle_rf_mic_valid_flag,
&hf_btle_rf_flags_rfu_2,
NULL
};
static int ett_btle_rf = -1;
static int ett_btle_rf_flags = -1;
static dissector_handle_t btle_rf_handle;
static dissector_handle_t btle_handle;
void proto_register_btle_rf(void);
void proto_reg_handoff_btle_rf(void);
static const char *
btle_rf_channel_type(guint8 rf_channel)
{
if (rf_channel <= 39) {
switch(rf_channel) {
case 0:
case 12:
case 39:
return "Advertising channel";
default:
return "Data channel";
}
}
return "Illegal channel";
}
static guint8
btle_rf_channel_index(guint8 rf_channel)
{
if (rf_channel <= 39) {
if (rf_channel == 39) {
return 39;
}
else if (rf_channel >= 13) {
return rf_channel - 2;
}
else if (rf_channel == 12) {
return 38;
}
else if (rf_channel >= 1) {
return rf_channel - 1;
}
else {
return 37;
}
}
return (guint8) -1;
}
static gint
dissect_btle_rf(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data)
{
proto_item *ti;
proto_tree *btle_rf_tree;
tvbuff_t *btle_tvb;
btle_context_t context;
guint8 rf_channel;
guint8 aa_offenses;
guint16 flags;
bluetooth_data_t *bluetooth_data = (bluetooth_data_t *) data;
if (tvb_captured_length(tvb) < BTLE_RF_OCTETS)
return 0;
col_set_str(pinfo->cinfo, COL_PROTOCOL, "BTLE RF");
col_clear(pinfo->cinfo, COL_INFO);
flags = tvb_get_letohs(tvb, 8);
memset(&context, 0, sizeof(context));
context.previous_protocol_data.bluetooth_data = bluetooth_data;
context.aa_category = E_AA_NO_COMMENT;
context.connection_info_valid = 0; /* TODO */
context.crc_checked_at_capture = !!(flags & LE_CRC_CHECKED);
context.crc_valid_at_capture = !!(flags & LE_CRC_VALID);
context.mic_checked_at_capture = !!(flags & LE_MIC_CHECKED);
context.mic_valid_at_capture = !!(flags & LE_MIC_VALID);
ti = proto_tree_add_item(tree, proto_btle_rf, tvb, 0, tvb_captured_length(tvb), ENC_NA);
btle_rf_tree = proto_item_add_subtree(ti, ett_btle_rf);
ti = proto_tree_add_item(btle_rf_tree, hf_btle_rf_channel, tvb, 0, 1, ENC_LITTLE_ENDIAN);
rf_channel = tvb_get_guint8(tvb, 0);
proto_item_append_text(ti, ", %d MHz, %s %d", 2402+2*rf_channel,
btle_rf_channel_type(rf_channel),
btle_rf_channel_index(rf_channel));
if (flags & LE_CHANNEL_ALIASED) {
proto_item_append_text(ti, " [aliased]");
}
if (flags & LE_SIGPOWER_VALID) {
proto_tree_add_item(btle_rf_tree, hf_btle_rf_signal_dbm, tvb, 1, 1, ENC_LITTLE_ENDIAN);
}
else {
proto_tree_add_item(btle_rf_tree, hf_btle_rf_signed_byte_unused, tvb, 1, 1, ENC_LITTLE_ENDIAN);
}
if (flags & LE_NOISEPOWER_VALID) {
proto_tree_add_item(btle_rf_tree, hf_btle_rf_noise_dbm, tvb, 2, 1, ENC_LITTLE_ENDIAN);
}
else {
proto_tree_add_item(btle_rf_tree, hf_btle_rf_signed_byte_unused, tvb, 2, 1, ENC_LITTLE_ENDIAN);
}
if (flags & LE_AA_OFFENSES_VALID) {
proto_tree_add_item(btle_rf_tree, hf_btle_rf_access_address_offenses, tvb, 3, 1, ENC_LITTLE_ENDIAN);
aa_offenses = tvb_get_guint8(tvb, 3);
if (aa_offenses > 0) {
if (flags & LE_REF_AA_VALID) {
context.aa_category = E_AA_BIT_ERRORS;
}
else {
context.aa_category = E_AA_ILLEGAL;
}
}
else if (flags & LE_REF_AA_VALID) {
context.aa_category = E_AA_MATCHED;
}
}
else {
proto_tree_add_item(btle_rf_tree, hf_btle_rf_unsigned_byte_unused, tvb, 3, 1, ENC_LITTLE_ENDIAN);
}
if (flags & LE_REF_AA_VALID) {
proto_tree_add_item(btle_rf_tree, hf_btle_rf_reference_access_address, tvb, 4, 4, ENC_LITTLE_ENDIAN);
}
else {
proto_tree_add_item(btle_rf_tree, hf_btle_rf_word_unused, tvb, 4, 4, ENC_LITTLE_ENDIAN);
}
proto_tree_add_bitmask_with_flags(btle_rf_tree, tvb, 8, hf_btle_rf_flags, ett_btle_rf_flags, hfs_btle_rf_flags, ENC_LITTLE_ENDIAN, BMT_NO_APPEND);
btle_tvb = tvb_new_subset_remaining(tvb, BTLE_RF_OCTETS);
return BTLE_RF_OCTETS+call_dissector_with_data(btle_handle, btle_tvb, pinfo, tree, &context);
}
void
proto_register_btle_rf(void)
{
static hf_register_info hf[] = {
{ &hf_btle_rf_signed_byte_unused,
{ "Unused signed byte", "btle_rf.signed_byte_unused",
FT_INT8, BASE_DEC,
NULL, 0x0,
NULL, HFILL }
},
{ &hf_btle_rf_unsigned_byte_unused,
{ "Unused unsigned byte", "btle_rf.unsigned_byte_unused",
FT_UINT8, BASE_DEC,
NULL, 0x0,
NULL, HFILL }
},
{ &hf_btle_rf_word_unused,
{ "Unused word", "btle_rf.word_unused",
FT_UINT32, BASE_HEX,
NULL, 0x0,
NULL, HFILL }
},
{ &hf_btle_rf_channel,
{ "RF Channel", "btle_rf.channel",
FT_UINT8, BASE_DEC,
NULL, 0x0,
NULL, HFILL }
},
{ &hf_btle_rf_signal_dbm,
{ "Signal dBm", "btle_rf.signal_dbm",
FT_INT8, BASE_DEC,
NULL, 0x0,
NULL, HFILL }
},
{ &hf_btle_rf_noise_dbm,
{ "Noise dBm", "btle_rf.noise_dbm",
FT_INT8, BASE_DEC,
NULL, 0x0,
NULL, HFILL }
},
{ &hf_btle_rf_access_address_offenses,
{ "Access Address Offenses", "btle_rf.access_address_offenses",
FT_UINT8, BASE_DEC,
NULL, 0x0,
NULL, HFILL }
},
{ &hf_btle_rf_reference_access_address,
{ "Reference Access Address", "btle_rf.reference_access_address",
FT_UINT32, BASE_HEX,
NULL, 0x0,
NULL, HFILL }
},
{ &hf_btle_rf_flags,
{ "Flags", "btle_rf.flags",
FT_UINT16, BASE_HEX,
NULL, 0x0,
NULL, HFILL }
},
{ &hf_btle_rf_dewhitened_flag,
{ "Dewhitened", "btle_rf.flags.dewhitened",
FT_BOOLEAN, 16,
NULL, LE_DEWHITENED,
NULL, HFILL }
},
{ &hf_btle_rf_sigpower_valid_flag,
{ "Signal Power Valid", "btle_rf.flags.signal_dbm_valid",
FT_BOOLEAN, 16,
NULL, LE_SIGPOWER_VALID,
NULL, HFILL }
},
{ &hf_btle_rf_noisepower_valid_flag,
{ "Noise Power Valid", "btle_rf.flags.noise_dbm_valid",
FT_BOOLEAN, 16,
NULL, LE_NOISEPOWER_VALID,
NULL, HFILL }
},
{ &hf_btle_rf_packet_decrypted_flag,
{ "Decrypted", "btle_rf.flags.decrypted",
FT_BOOLEAN, 16,
NULL, LE_PACKET_DECRYPTED,
NULL, HFILL }
},
{ &hf_btle_rf_ref_aa_valid_flag,
{ "Reference Access Address Valid",
"btle_rf.flags.reference_access_address_valid",
FT_BOOLEAN, 16,
NULL, LE_REF_AA_VALID,
NULL, HFILL }
},
{ &hf_btle_rf_aa_offenses_valid_flag,
{ "Access Address Offenses Valid",
"btle_rf.flags.access_address_offenses_valid",
FT_BOOLEAN, 16,
NULL, LE_AA_OFFENSES_VALID,
NULL, HFILL }
},
{ &hf_btle_rf_channel_aliased_flag,
{ "Channel Aliased", "btle_rf.flags.channel_aliased",
FT_BOOLEAN, 16,
NULL, LE_CHANNEL_ALIASED,
NULL, HFILL }
},
{ &hf_btle_rf_flags_rfu_1,
{ "RFU", "btle_rf.flags.rfu.1",
FT_UINT16, BASE_DEC, NULL, 0x380,
NULL, HFILL }
},
{ &hf_btle_rf_crc_checked_flag,
{ "CRC Checked", "btle_rf.flags.crc_checked",
FT_BOOLEAN, 16,
NULL, LE_CRC_CHECKED,
NULL, HFILL }
},
{ &hf_btle_rf_crc_valid_flag,
{ "CRC Valid", "btle_rf.flags.crc_valid",
FT_BOOLEAN, 16,
NULL, LE_CRC_VALID,
NULL, HFILL }
},
{ &hf_btle_rf_mic_checked_flag,
{ "MIC Checked", "btle_rf.flags.mic_checked",
FT_BOOLEAN, 16,
NULL, LE_MIC_CHECKED,
NULL, HFILL }
},
{ &hf_btle_rf_mic_valid_flag,
{ "MIC Valid", "btle_rf.flags.mic_valid",
FT_BOOLEAN, 16,
NULL, LE_MIC_VALID,
NULL, HFILL }
},
{ &hf_btle_rf_flags_rfu_2,
{ "RFU", "btle_rf.flags.rfu.2",
FT_UINT16, BASE_DEC, NULL, 0xc000,
NULL, HFILL }
},
};
static gint *ett[] = {
&ett_btle_rf,
&ett_btle_rf_flags,
};
proto_btle_rf = proto_register_protocol("Bluetooth Low Energy RF Info",
"BTLE RF", "btle_rf");
proto_register_field_array(proto_btle_rf, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
btle_rf_handle = register_dissector("btle_rf", dissect_btle_rf, proto_btle_rf);
}
void
proto_reg_handoff_btle_rf(void)
{
dissector_add_uint("bluetooth.encap", WTAP_ENCAP_BLUETOOTH_LE_LL_WITH_PHDR, btle_rf_handle);
btle_handle = find_dissector_add_dependency("btle", proto_btle_rf);
}
/*
* 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:
*/
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