1 /* -*- c -*- */ 2 /* 3 * Copyright 2007 - 2013 Dominic Spill, Michael Ossmann, Will Code 4 * 5 * This file is part of libbtbb 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License as published by 9 * the Free Software Foundation; either version 2, or (at your option) 10 * any later version. 11 * 12 * This program is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * GNU General Public License for more details. 16 * 17 * You should have received a copy of the GNU General Public License 18 * along with libbtbb; see the file COPYING. If not, write to 19 * the Free Software Foundation, Inc., 51 Franklin Street, 20 * Boston, MA 02110-1301, USA. 21 */ 22 #ifndef INCLUDED_BLUETOOTH_PACKET_H 23 #define INCLUDED_BLUETOOTH_PACKET_H 24 #include "btbb.h" 25 26 /* maximum number of symbols */ 27 #define MAX_SYMBOLS 3125 28 29 /* maximum number of payload bits */ 30 #define MAX_PAYLOAD_LENGTH 2744 31 32 /* minimum header bit errors to indicate that this is an ID packet */ 33 #define ID_THRESHOLD 5 34 35 typedef struct btbb_packet { 36 37 uint32_t refcount; 38 39 uint32_t flags; 40 41 uint8_t channel; /* Bluetooth channel (0-79) */ 42 uint8_t UAP; /* upper address part */ 43 uint16_t NAP; /* non-significant address part */ 44 uint32_t LAP; /* lower address part found in access code */ 45 46 uint8_t packet_type; 47 uint8_t packet_lt_addr; /* LLID field of payload header (2 bits) */ 48 uint8_t packet_flags; /* Flags - FLOW/ARQN/SQEN */ 49 uint8_t packet_hec; /* Flags - FLOW/ARQN/SQEN */ 50 51 /* packet header, one bit per char */ 52 char packet_header[18]; 53 54 /* number of payload header bytes: 0, 1, 2, or -1 for 55 * unknown. payload is one bit per char. */ 56 int payload_header_length; 57 char payload_header[16]; 58 59 /* LLID field of payload header (2 bits) */ 60 uint8_t payload_llid; 61 62 /* flow field of payload header (1 bit) */ 63 uint8_t payload_flow; 64 65 /* payload length: the total length of the asynchronous data 66 * in bytes. This does not include the length of synchronous 67 * data, such as the voice field of a DV packet. If there is a 68 * payload header, this payload length is payload body length 69 * (the length indicated in the payload header's length field) 70 * plus payload_header_length plus 2 bytes CRC (if present). 71 */ 72 int payload_length; 73 74 /* The actual payload data in host format 75 * Ready for passing to wireshark 76 * 2744 is the maximum length, but most packets are shorter. 77 * Dynamic allocation would probably be better in the long run but is 78 * problematic in the short run. 79 */ 80 char payload[MAX_PAYLOAD_LENGTH]; 81 82 uint16_t crc; 83 uint32_t clock; /* CLK1-27 of master */ 84 uint32_t clkn; /* native (local) clock, CLK0-27 */ 85 uint8_t ac_errors; /* Number of bit errors in the AC */ 86 87 /* the raw symbol stream (less the preamble), one bit per char */ 88 //FIXME maybe this should be a vector so we can grow it only 89 //to the size needed and later shrink it if we find we have 90 //more symbols than necessary 91 uint16_t length; /* number of symbols */ 92 char symbols[MAX_SYMBOLS]; 93 94 } btbb_packet; 95 96 /* type-specific CRC checks and decoding */ 97 int fhs(int clock, btbb_packet* p); 98 int DM(int clock, btbb_packet* p); 99 int DH(int clock, btbb_packet* p); 100 int EV3(int clock, btbb_packet* p); 101 int EV4(int clock, btbb_packet* p); 102 int EV5(int clock, btbb_packet* p); 103 int HV(int clock, btbb_packet* p); 104 105 /* check if the packet's CRC is correct for a given clock (CLK1-6) */ 106 int crc_check(int clock, btbb_packet* p); 107 108 /* format payload for tun interface */ 109 char *tun_format(btbb_packet* p); 110 111 /* try a clock value (CLK1-6) to unwhiten packet header, 112 * sets resultant d_packet_type and d_UAP, returns UAP. 113 */ 114 uint8_t try_clock(int clock, btbb_packet* p); 115 116 /* extract LAP from FHS payload */ 117 uint32_t lap_from_fhs(btbb_packet* p); 118 119 /* extract UAP from FHS payload */ 120 uint8_t uap_from_fhs(btbb_packet* p); 121 122 /* extract NAP from FHS payload */ 123 uint16_t nap_from_fhs(btbb_packet* p); 124 125 /* extract clock from FHS payload */ 126 uint32_t clock_from_fhs(btbb_packet* p); 127 128 #endif /* INCLUDED_BLUETOOTH_PACKET_H */ 129