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/* Copyright 2021 The libwifi Authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef LIBWIFI_CORE_FRAME_H
#define LIBWIFI_CORE_FRAME_H
#include "../../core/misc/byteswap.h"
#include <stdint.h>
#include <sys/types.h>
/* libwifi_frame Flags */
#define LIBWIFI_FLAGS_FCS_PRESENT (1 << 0)
#define LIBWIFI_FLAGS_IS_QOS (1 << 1)
#define LIBWIFI_FLAGS_IS_ORDERED (1 << 2)
/* Defined frame types and sub-types */
enum libwifi_frame_type {
TYPE_MANAGEMENT = 0,
TYPE_CONTROL = 1,
TYPE_DATA = 2,
TYPE_EXTENSION = 3,
};
enum libwifi_mgmt_subtypes {
SUBTYPE_ASSOC_REQ = 0,
SUBTYPE_ASSOC_RESP = 1,
SUBTYPE_REASSOC_REQ = 2,
SUBTYPE_REASSOC_RESP = 3,
SUBTYPE_PROBE_REQ = 4,
SUBTYPE_PROBE_RESP = 5,
SUBTYPE_TIME_ADV = 6,
// Reserved = 7,
SUBTYPE_BEACON = 8,
SUBTYPE_ATIM = 9,
SUBTYPE_DISASSOC = 10,
SUBTYPE_AUTH = 11,
SUBTYPE_DEAUTH = 12,
SUBTYPE_ACTION = 13,
SUBTYPE_ACTION_NOACK = 14,
// Reserved = 15,
};
enum libwifi_control_subtypes {
// Reserved = 0-3,
SUBTYPE_TACK = 3,
SUBTYPE_BEAMFORM_REPORT_POLL = 4,
SUBTYPE_VHT_NDP_ANNOUNCE = 5,
SUBTYPE_CF_EXTENSION = 6,
SUBTYPE_WRAPPER = 7,
SUBTYPE_BLOCK_ACK_REQ = 8,
SUBTYPE_BLOCK_ACK = 9,
SUBTYPE_PS_POLL = 10,
SUBTYPE_RTS = 11,
SUBTYPE_CTS = 12,
SUBTYPE_ACK = 13,
SUBTYPE_CF_END = 14,
SUBTYPE_CF_END_CF_ACK = 15,
};
enum libwifi_control_extension_subtypes {
// Reserved = 0-1,
SUBTYPE_CF_EXT_POLL = 2,
SUBTYPE_CF_EXT_SPR = 3,
SUBTYPE_CF_EXT_GRANT = 4,
SUBTYPE_CF_EXT_DMG_CTS = 5,
SUBTYPE_CF_EXT_DMG_DTS = 6,
SUBTYPE_CF_EXT_GRANT_ACK = 7,
SUBTYPE_CF_EXT_SSW = 8,
SUBTYPE_CF_EXT_SSW_FEEDBACK = 9,
SUBTYPE_CF_EXT_SSW_ACK = 10,
// Reserved = 11-15,
};
enum libwifi_data_subtypes {
SUBTYPE_DATA = 0,
// Reserved = 1-3,
SUBTYPE_DATA_NULL = 4,
// Reserved = 4-7,
SUBTYPE_DATA_QOS_DATA = 8,
SUBTYPE_DATA_QOS_DATA_CF_ACK = 9,
SUBTYPE_DATA_QOS_DATA_CF_POLL = 10,
SUBTYPE_DATA_QOS_DATA_CF_ACK_CF_POLL = 11,
SUBTYPE_DATA_QOS_NULL = 12,
// Reserved = 13,
SUBTYPE_DATA_QOS_CF_POLL = 14,
SUBTYPE_DATA_QOS_CF_ACK_CF_POLL = 15,
};
enum libwifi_extension_subtypes {
SUBTYPE_EXTENSION_DMG_BEACON = 0,
SUBTYPE_EXTENSION_SIG_BEACON = 1,
// Reserved = 2-15
};
/*
* libwifi Representation of an 802.11 Frame Control Field's Flags.
*/
struct libwifi_frame_ctrl_flags {
unsigned int to_ds : 1;
unsigned int from_ds : 1;
unsigned int more_frags : 1;
unsigned int retry : 1;
unsigned int power_mgmt : 1;
unsigned int more_data : 1;
unsigned int protect : 1;
unsigned int ordered : 1;
} __attribute__((packed));
/*
* libwifi Representation of an 802.11 Frame Control Field.
*/
struct libwifi_frame_ctrl {
unsigned int version : 2;
unsigned int type : 2;
unsigned int subtype : 4;
struct libwifi_frame_ctrl_flags flags;
} __attribute__((packed));
/*
* libwifi Representation of an 802.11 Sequence Control Field.
*/
struct libwifi_seq_control {
unsigned int fragment_number : 4;
unsigned int sequence_number : 12;
} __attribute__((packed));
/*
* libwifi Representation of an 802.11 Data QoS Control Field.
*
* As the bits of the QoS Control Field can vary depending on other
* factors, generic bit names are used here.
*/
struct libwifi_qos_control {
unsigned int bit1 : 1;
unsigned int bit2 : 1;
unsigned int bit3 : 1;
unsigned int bit4 : 1;
unsigned int bit5 : 1;
unsigned int bit6 : 1;
unsigned int bit7 : 1;
unsigned int bit8 : 1;
unsigned int bit9 : 1;
unsigned int bit10 : 1;
unsigned int bit11 : 1;
unsigned int bit12 : 1;
unsigned int bit13 : 1;
unsigned int bit14 : 1;
unsigned int bit15 : 1;
unsigned int bit16 : 1;
} __attribute__((packed));
/*
* libwifi Representation of an ordered Management Frame header.
*
* ┌───────────────────────────┐
* │ Frame Control Field │ ── 2 Bytes
* ├───────────────────────────┤
* │ Duration │ ── 2 Bytes
* ├───────────────────────────┤
* │ Address 1 │ ── 6 Bytes
* ├───────────────────────────┤
* │ Address 2 │ ── 6 Bytes
* ├───────────────────────────┤
* │ Address 3 │ ── 6 Bytes
* ├───────────────────────────┤
* │ Sequence Control │ ── 2 Bytes
* ├───────────────────────────┤
* │ HT Control │ ── 4 Bytes
* └───────────────────────────┘
*/
struct libwifi_mgmt_ordered_frame_header {
struct libwifi_frame_ctrl frame_control;
uint16_t duration;
unsigned char addr1[6];
unsigned char addr2[6];
unsigned char addr3[6];
struct libwifi_seq_control seq_control;
uint32_t ht_control;
} __attribute__((packed));
/*
* libwifi Representation of an unordered Management Frame header.
*
* ┌───────────────────────────┐
* │ Frame Control Field │ ── 2 Bytes
* ├───────────────────────────┤
* │ Duration │ ── 2 Bytes
* ├───────────────────────────┤
* │ Address 1 │ ── 6 Bytes
* ├───────────────────────────┤
* │ Address 2 │ ── 6 Bytes
* ├───────────────────────────┤
* │ Address 3 │ ── 6 Bytes
* ├───────────────────────────┤
* │ Sequence Control │ ── 2 Bytes
* └───────────────────────────┘
*/
struct libwifi_mgmt_unordered_frame_header {
struct libwifi_frame_ctrl frame_control;
uint16_t duration;
unsigned char addr1[6];
unsigned char addr2[6];
unsigned char addr3[6];
struct libwifi_seq_control seq_control;
} __attribute__((packed));
/*
* libwifi Representation of a Control Frame header.
*
* ┌───────────────────────────┐
* │ Frame Control Field │ ── 2 Bytes
* ├───────────────────────────┤
* │ Duration │ ── 2 Bytes
* └───────────────────────────┘
*/
struct libwifi_ctrl_frame_header {
struct libwifi_frame_ctrl frame_control;
uint16_t duration;
} __attribute__((packed));
/*
* libwifi Representation of a non-QoS Data Frame header.
*
* ┌───────────────────────────┐
* │ Frame Control Field │ ── 2 Bytes
* ├───────────────────────────┤
* │ Duration │ ── 2 Bytes
* ├───────────────────────────┤
* │ Address 1 │ ── 6 Bytes
* ├───────────────────────────┤
* │ Address 2 │ ── 6 Bytes
* ├───────────────────────────┤
* │ Address 3 │ ── 6 Bytes
* ├───────────────────────────┤
* │ Sequence Control │ ── 2 Bytes
* └───────────────────────────┘
*/
struct libwifi_data_frame_header {
struct libwifi_frame_ctrl frame_control;
uint16_t duration;
unsigned char addr1[6];
unsigned char addr2[6];
unsigned char addr3[6];
struct libwifi_seq_control seq_control;
} __attribute__((packed));
/*
* libwifi Representation of a QoS Data Frame header.
*
* ┌───────────────────────────┐
* │ Frame Control Field │ ── 2 Bytes
* ├───────────────────────────┤
* │ Duration │ ── 2 Bytes
* ├───────────────────────────┤
* │ Address 1 │ ── 6 Bytes
* ├───────────────────────────┤
* │ Address 2 │ ── 6 Bytes
* ├───────────────────────────┤
* │ Address 3 │ ── 6 Bytes
* ├───────────────────────────┤
* │ Sequence Control │ ── 2 Bytes
* ├───────────────────────────┤
* │ QoS Control │ ── 2 Bytes
* └───────────────────────────┘
*/
struct libwifi_data_qos_frame_header {
struct libwifi_frame_ctrl frame_control;
uint16_t duration;
unsigned char addr1[6];
unsigned char addr2[6];
unsigned char addr3[6];
struct libwifi_seq_control seq_control;
struct libwifi_qos_control qos_control;
} __attribute__((packed));
/*
* Union of all frame type headers for use with a libwifi_frame struct
*/
union libwifi_frame_header {
struct libwifi_mgmt_ordered_frame_header mgmt_ordered;
struct libwifi_mgmt_unordered_frame_header mgmt_unordered;
struct libwifi_ctrl_frame_header ctrl;
struct libwifi_data_frame_header data;
struct libwifi_data_qos_frame_header data_qos;
};
/*
* Union of all Management Frame headers
*/
union libwifi_mgmt_frame_header {
struct libwifi_mgmt_ordered_frame_header ordered;
struct libwifi_mgmt_unordered_frame_header unordered;
};
/*
* A libwifi_frame struct is used to represent any type of 802.11
* frame in libwifi.
*/
struct libwifi_frame {
uint16_t flags;
struct libwifi_frame_ctrl frame_control;
size_t len;
union libwifi_frame_header header;
size_t header_len;
unsigned char *body;
};
/**
* Convert a sniffed 802.11 frame into a libwifi_frame.
*
* @param fi A libwifi_frame struct
* @param frame An 802.11 frame
* @param frame_len Length of the sniffed 802.11 frame
* @return
*/
int libwifi_get_wifi_frame(struct libwifi_frame *fi, const unsigned char *frame, size_t frame_len,
int radiotap);
/**
* Free any dynamically allocated data inside a libwifi_frame.
*
* @param fi A libwifi_frame struct
*/
void libwifi_free_wifi_frame(struct libwifi_frame *fi);
#endif /* LIBWIFI_CORE_FRAME_H */
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