[MAC80211]: Add mac80211 wireless stack.

Add mac80211, the IEEE 802.11 software MAC layer.

Signed-off-by: Jiri Benc <jbenc@suse.cz>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 1045 insertions, 0 deletions

diff --git a/include/net/mac80211.h b/include/net/mac80211.h
new file mode 100644
index 00000000000..a7f122b7994
--- /dev/null
+++ b/include/net/mac80211.h
@@ -0,0 +1,1045 @@
+/*
+ * Low-level hardware driver -- IEEE 802.11 driver (80211.o) interface
+ * Copyright 2002-2005, Devicescape Software, Inc.
+ * Copyright 2006-2007	Jiri Benc <jbenc@suse.cz>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef MAC80211_H
+#define MAC80211_H
+
+#include <linux/kernel.h>
+#include <linux/if_ether.h>
+#include <linux/skbuff.h>
+#include <linux/wireless.h>
+#include <linux/device.h>
+#include <linux/ieee80211.h>
+#include <net/wireless.h>
+#include <net/cfg80211.h>
+
+/* Note! Only ieee80211_tx_status_irqsafe() and ieee80211_rx_irqsafe() can be
+ * called in hardware interrupt context. The low-level driver must not call any
+ * other functions in hardware interrupt context. If there is a need for such
+ * call, the low-level driver should first ACK the interrupt and perform the
+ * IEEE 802.11 code call after this, e.g., from a scheduled tasklet (in
+ * software interrupt context).
+ */
+
+/*
+ * Frame format used when passing frame between low-level hardware drivers
+ * and IEEE 802.11 driver the same as used in the wireless media, i.e.,
+ * buffers start with IEEE 802.11 header and include the same octets that
+ * are sent over air.
+ *
+ * If hardware uses IEEE 802.3 headers (and perform 802.3 <-> 802.11
+ * conversion in firmware), upper layer 802.11 code needs to be changed to
+ * support this.
+ *
+ * If the receive frame format is not the same as the real frame sent
+ * on the wireless media (e.g., due to padding etc.), upper layer 802.11 code
+ * could be updated to provide support for such format assuming this would
+ * optimize the performance, e.g., by removing need to re-allocation and
+ * copying of the data.
+ */
+
+#define IEEE80211_CHAN_W_SCAN 0x00000001
+#define IEEE80211_CHAN_W_ACTIVE_SCAN 0x00000002
+#define IEEE80211_CHAN_W_IBSS 0x00000004
+
+/* Channel information structure. Low-level driver is expected to fill in chan,
+ * freq, and val fields. Other fields will be filled in by 80211.o based on
+ * hostapd information and low-level driver does not need to use them. The
+ * limits for each channel will be provided in 'struct ieee80211_conf' when
+ * configuring the low-level driver with hw->config callback. If a device has
+ * a default regulatory domain, IEEE80211_HW_DEFAULT_REG_DOMAIN_CONFIGURED
+ * can be set to let the driver configure all fields */
+struct ieee80211_channel {
+	short chan; /* channel number (IEEE 802.11) */
+	short freq; /* frequency in MHz */
+	int val; /* hw specific value for the channel */
+	int flag; /* flag for hostapd use (IEEE80211_CHAN_*) */
+	unsigned char power_level;
+	unsigned char antenna_max;
+};
+
+#define IEEE80211_RATE_ERP 0x00000001
+#define IEEE80211_RATE_BASIC 0x00000002
+#define IEEE80211_RATE_PREAMBLE2 0x00000004
+#define IEEE80211_RATE_SUPPORTED 0x00000010
+#define IEEE80211_RATE_OFDM 0x00000020
+#define IEEE80211_RATE_CCK 0x00000040
+#define IEEE80211_RATE_TURBO 0x00000080
+#define IEEE80211_RATE_MANDATORY 0x00000100
+
+#define IEEE80211_RATE_CCK_2 (IEEE80211_RATE_CCK | IEEE80211_RATE_PREAMBLE2)
+#define IEEE80211_RATE_MODULATION(f) \
+	(f & (IEEE80211_RATE_CCK | IEEE80211_RATE_OFDM))
+
+/* Low-level driver should set PREAMBLE2, OFDM, CCK, and TURBO flags.
+ * BASIC, SUPPORTED, ERP, and MANDATORY flags are set in 80211.o based on the
+ * configuration. */
+struct ieee80211_rate {
+	int rate; /* rate in 100 kbps */
+	int val; /* hw specific value for the rate */
+	int flags; /* IEEE80211_RATE_ flags */
+	int val2; /* hw specific value for the rate when using short preamble
+		   * (only when IEEE80211_RATE_PREAMBLE2 flag is set, i.e., for
+		   * 2, 5.5, and 11 Mbps) */
+	signed char min_rssi_ack;
+	unsigned char min_rssi_ack_delta;
+
+	/* following fields are set by 80211.o and need not be filled by the
+	 * low-level driver */
+	int rate_inv; /* inverse of the rate (LCM(all rates) / rate) for
+		       * optimizing channel utilization estimates */
+};
+
+/* 802.11g is backwards-compatible with 802.11b, so a wlan card can
+ * actually be both in 11b and 11g modes at the same time. */
+enum {
+	MODE_IEEE80211A, /* IEEE 802.11a */
+	MODE_IEEE80211B, /* IEEE 802.11b only */
+	MODE_ATHEROS_TURBO, /* Atheros Turbo mode (2x.11a at 5 GHz) */
+	MODE_IEEE80211G, /* IEEE 802.11g (and 802.11b compatibility) */
+	MODE_ATHEROS_TURBOG, /* Atheros Turbo mode (2x.11g at 2.4 GHz) */
+
+	/* keep last */
+	NUM_IEEE80211_MODES
+};
+
+struct ieee80211_hw_mode {
+	int mode; /* MODE_IEEE80211... */
+	int num_channels; /* Number of channels (below) */
+	struct ieee80211_channel *channels; /* Array of supported channels */
+	int num_rates; /* Number of rates (below) */
+	struct ieee80211_rate *rates; /* Array of supported rates */
+
+	struct list_head list; /* Internal, don't touch */
+};
+
+struct ieee80211_tx_queue_params {
+	int aifs; /* 0 .. 255; -1 = use default */
+	int cw_min; /* 2^n-1: 1, 3, 7, .. , 1023; 0 = use default */
+	int cw_max; /* 2^n-1: 1, 3, 7, .. , 1023; 0 = use default */
+	int burst_time; /* maximum burst time in 0.1 ms (i.e., 10 = 1 ms);
+			 * 0 = disabled */
+};
+
+struct ieee80211_tx_queue_stats_data {
+	unsigned int len; /* num packets in queue */
+	unsigned int limit; /* queue len (soft) limit */
+	unsigned int count; /* total num frames sent */
+};
+
+enum {
+	IEEE80211_TX_QUEUE_DATA0,
+	IEEE80211_TX_QUEUE_DATA1,
+	IEEE80211_TX_QUEUE_DATA2,
+	IEEE80211_TX_QUEUE_DATA3,
+	IEEE80211_TX_QUEUE_DATA4,
+	IEEE80211_TX_QUEUE_SVP,
+
+	NUM_TX_DATA_QUEUES,
+
+/* due to stupidity in the sub-ioctl userspace interface, the items in
+ * this struct need to have fixed values. As soon as it is removed, we can
+ * fix these entries. */
+	IEEE80211_TX_QUEUE_AFTER_BEACON = 6,
+	IEEE80211_TX_QUEUE_BEACON = 7
+};
+
+struct ieee80211_tx_queue_stats {
+	struct ieee80211_tx_queue_stats_data data[NUM_TX_DATA_QUEUES];
+};
+
+struct ieee80211_low_level_stats {
+	unsigned int dot11ACKFailureCount;
+	unsigned int dot11RTSFailureCount;
+	unsigned int dot11FCSErrorCount;
+	unsigned int dot11RTSSuccessCount;
+};
+
+/* Transmit control fields. This data structure is passed to low-level driver
+ * with each TX frame. The low-level driver is responsible for configuring
+ * the hardware to use given values (depending on what is supported). */
+#define HW_KEY_IDX_INVALID -1
+
+struct ieee80211_tx_control {
+	int tx_rate; /* Transmit rate, given as the hw specific value for the
+		      * rate (from struct ieee80211_rate) */
+	int rts_cts_rate; /* Transmit rate for RTS/CTS frame, given as the hw
+			   * specific value for the rate (from
+			   * struct ieee80211_rate) */
+
+#define IEEE80211_TXCTL_REQ_TX_STATUS	(1<<0)/* request TX status callback for
+						* this frame */
+#define IEEE80211_TXCTL_DO_NOT_ENCRYPT	(1<<1) /* send this frame without
+						* encryption; e.g., for EAPOL
+						* frames */
+#define IEEE80211_TXCTL_USE_RTS_CTS	(1<<2) /* use RTS-CTS before sending
+						* frame */
+#define IEEE80211_TXCTL_USE_CTS_PROTECT	(1<<3) /* use CTS protection for the
+						* frame (e.g., for combined
+						* 802.11g / 802.11b networks) */
+#define IEEE80211_TXCTL_NO_ACK		(1<<4) /* tell the low level not to
+						* wait for an ack */
+#define IEEE80211_TXCTL_RATE_CTRL_PROBE	(1<<5)
+#define IEEE80211_TXCTL_CLEAR_DST_MASK	(1<<6)
+#define IEEE80211_TXCTL_REQUEUE		(1<<7)
+#define IEEE80211_TXCTL_FIRST_FRAGMENT	(1<<8) /* this is a first fragment of
+						* the frame */
+#define IEEE80211_TXCTL_TKIP_NEW_PHASE1_KEY (1<<9)
+	u32 flags;			       /* tx control flags defined
+						* above */
+	u8 retry_limit;		/* 1 = only first attempt, 2 = one retry, .. */
+	u8 power_level;		/* per-packet transmit power level, in dBm */
+	u8 antenna_sel_tx; 	/* 0 = default/diversity, 1 = Ant0, 2 = Ant1 */
+	s8 key_idx;		/* -1 = do not encrypt, >= 0 keyidx from
+				 * hw->set_key() */
+	u8 icv_len;		/* length of the ICV/MIC field in octets */
+	u8 iv_len;		/* length of the IV field in octets */
+	u8 tkip_key[16];	/* generated phase2/phase1 key for hw TKIP */
+	u8 queue;		/* hardware queue to use for this frame;
+				 * 0 = highest, hw->queues-1 = lowest */
+	u8 sw_retry_attempt;	/* number of times hw has tried to
+				 * transmit frame (not incl. hw retries) */
+
+	struct ieee80211_rate *rate;		/* internal 80211.o rate */
+	struct ieee80211_rate *rts_rate;	/* internal 80211.o rate
+						 * for RTS/CTS */
+	int alt_retry_rate; /* retry rate for the last retries, given as the
+			     * hw specific value for the rate (from
+			     * struct ieee80211_rate). To be used to limit
+			     * packet dropping when probing higher rates, if hw
+			     * supports multiple retry rates. -1 = not used */
+	int type;	/* internal */
+	int ifindex;	/* internal */
+};
+
+/* Receive status. The low-level driver should provide this information
+ * (the subset supported by hardware) to the 802.11 code with each received
+ * frame. */
+struct ieee80211_rx_status {
+	u64 mactime;
+	int freq; /* receive frequency in Mhz */
+	int channel;
+	int phymode;
+	int ssi;
+	int signal; /* used as qual in statistics reporting */
+	int noise;
+	int antenna;
+	int rate;
+#define RX_FLAG_MMIC_ERROR	(1<<0)
+#define RX_FLAG_DECRYPTED	(1<<1)
+#define RX_FLAG_RADIOTAP	(1<<2)
+	int flag;
+};
+
+/* Transmit status. The low-level driver should provide this information
+ * (the subset supported by hardware) to the 802.11 code for each transmit
+ * frame. */
+struct ieee80211_tx_status {
+	/* copied ieee80211_tx_control structure */
+	struct ieee80211_tx_control control;
+
+#define IEEE80211_TX_STATUS_TX_FILTERED	(1<<0)
+#define IEEE80211_TX_STATUS_ACK		(1<<1) /* whether the TX frame was ACKed */
+	u32 flags;		/* tx staus flags defined above */
+
+	int ack_signal; /* measured signal strength of the ACK frame */
+	int excessive_retries;
+	int retry_count;
+
+	int queue_length;      /* information about TX queue */
+	int queue_number;
+};
+
+
+/**
+ * struct ieee80211_conf - configuration of the device
+ *
+ * This struct indicates how the driver shall configure the hardware.
+ *
+ * @radio_enabled: when zero, driver is required to switch off the radio.
+ */
+struct ieee80211_conf {
+	int channel;			/* IEEE 802.11 channel number */
+	int freq;			/* MHz */
+	int channel_val;		/* hw specific value for the channel */
+
+	int phymode;			/* MODE_IEEE80211A, .. */
+	struct ieee80211_channel *chan;
+	struct ieee80211_hw_mode *mode;
+	unsigned int regulatory_domain;
+	int radio_enabled;
+
+	int beacon_int;
+
+#define IEEE80211_CONF_SHORT_SLOT_TIME	(1<<0) /* use IEEE 802.11g Short Slot
+						* Time */
+#define IEEE80211_CONF_SSID_HIDDEN	(1<<1) /* do not broadcast the ssid */
+#define IEEE80211_CONF_RADIOTAP		(1<<2) /* use radiotap if supported
+						  check this bit at RX time */
+	u32 flags;			/* configuration flags defined above */
+
+	u8 power_level;			/* transmit power limit for current
+					 * regulatory domain; in dBm */
+	u8 antenna_max;			/* maximum antenna gain */
+	short tx_power_reduction; /* in 0.1 dBm */
+
+	/* 0 = default/diversity, 1 = Ant0, 2 = Ant1 */
+	u8 antenna_sel_tx;
+	u8 antenna_sel_rx;
+
+	int antenna_def;
+	int antenna_mode;
+
+	/* Following five fields are used for IEEE 802.11H */
+	unsigned int radar_detect;
+	unsigned int spect_mgmt;
+	/* All following fields are currently unused. */
+	unsigned int quiet_duration; /* duration of quiet period */
+	unsigned int quiet_offset; /* how far into the beacon is the quiet
+				    * period */
+	unsigned int quiet_period;
+	u8 radar_firpwr_threshold;
+	u8 radar_rssi_threshold;
+	u8 pulse_height_threshold;
+	u8 pulse_rssi_threshold;
+	u8 pulse_inband_threshold;
+};
+
+/**
+ * enum ieee80211_if_types - types of 802.11 network interfaces
+ *
+ * @IEEE80211_IF_TYPE_AP: interface in AP mode.
+ * @IEEE80211_IF_TYPE_MGMT: special interface for communication with hostap
+ *	daemon. Drivers should never see this type.
+ * @IEEE80211_IF_TYPE_STA: interface in STA (client) mode.
+ * @IEEE80211_IF_TYPE_IBSS: interface in IBSS (ad-hoc) mode.
+ * @IEEE80211_IF_TYPE_MNTR: interface in monitor (rfmon) mode.
+ * @IEEE80211_IF_TYPE_WDS: interface in WDS mode.
+ * @IEEE80211_IF_TYPE_VLAN: not used.
+ */
+enum ieee80211_if_types {
+	IEEE80211_IF_TYPE_AP = 0x00000000,
+	IEEE80211_IF_TYPE_MGMT = 0x00000001,
+	IEEE80211_IF_TYPE_STA = 0x00000002,
+	IEEE80211_IF_TYPE_IBSS = 0x00000003,
+	IEEE80211_IF_TYPE_MNTR = 0x00000004,
+	IEEE80211_IF_TYPE_WDS = 0x5A580211,
+	IEEE80211_IF_TYPE_VLAN = 0x00080211,
+};
+
+/**
+ * struct ieee80211_if_init_conf - initial configuration of an interface
+ *
+ * @if_id: internal interface ID. This number has no particular meaning to
+ *	drivers and the only allowed usage is to pass it to
+ *	ieee80211_beacon_get() and ieee80211_get_buffered_bc() functions.
+ *	This field is not valid for monitor interfaces
+ *	(interfaces of %IEEE80211_IF_TYPE_MNTR type).
+ * @type: one of &enum ieee80211_if_types constants. Determines the type of
+ *	added/removed interface.
+ * @mac_addr: pointer to MAC address of the interface. This pointer is valid
+ *	until the interface is removed (i.e. it cannot be used after
+ *	remove_interface() callback was called for this interface).
+ *
+ * This structure is used in add_interface() and remove_interface()
+ * callbacks of &struct ieee80211_hw.
+ */
+struct ieee80211_if_init_conf {
+	int if_id;
+	int type;
+	void *mac_addr;
+};
+
+/**
+ * struct ieee80211_if_conf - configuration of an interface
+ *
+ * @type: type of the interface. This is always the same as was specified in
+ *	&struct ieee80211_if_init_conf. The type of an interface never changes
+ *	during the life of the interface; this field is present only for
+ *	convenience.
+ * @bssid: BSSID of the network we are associated to/creating.
+ * @ssid: used (together with @ssid_len) by drivers for hardware that
+ *	generate beacons independently. The pointer is valid only during the
+ *	config_interface() call, so copy the value somewhere if you need
+ *	it.
+ * @ssid_len: length of the @ssid field.
+ * @generic_elem: used (together with @generic_elem_len) by drivers for
+ *	hardware that generate beacons independently. The pointer is valid
+ *	only during the config_interface() call, so copy the value somewhere
+ *	if you need it.
+ * @generic_elem_len: length of the generic element.
+ * @beacon: beacon template. Valid only if @host_gen_beacon_template in
+ *	&struct ieee80211_hw is set. The driver is responsible of freeing
+ *	the sk_buff.
+ * @beacon_control: tx_control for the beacon template, this field is only
+ *	valid when the @beacon field was set.
+ *
+ * This structure is passed to the config_interface() callback of
+ * &struct ieee80211_hw.
+ */
+struct ieee80211_if_conf {
+	int type;
+	u8 *bssid;
+	u8 *ssid;
+	size_t ssid_len;
+	u8 *generic_elem;
+	size_t generic_elem_len;
+	struct sk_buff *beacon;
+	struct ieee80211_tx_control *beacon_control;
+};
+
+typedef enum { ALG_NONE, ALG_WEP, ALG_TKIP, ALG_CCMP, ALG_NULL }
+ieee80211_key_alg;
+
+
+struct ieee80211_key_conf {
+
+	int hw_key_idx;			/* filled + used by low-level driver */
+	ieee80211_key_alg alg;
+	int keylen;
+
+#define IEEE80211_KEY_FORCE_SW_ENCRYPT (1<<0) /* to be cleared by low-level
+						 driver */
+#define IEEE80211_KEY_DEFAULT_TX_KEY   (1<<1) /* This key is the new default TX
+						 key (used only for broadcast
+						 keys). */
+#define IEEE80211_KEY_DEFAULT_WEP_ONLY (1<<2) /* static WEP is the only
+						 configured security policy;
+						 this allows some low-level
+						 drivers to determine when
+						 hwaccel can be used */
+	u32 flags; /* key configuration flags defined above */
+
+	s8 keyidx;			/* WEP key index */
+	u8 key[0];
+};
+
+#define IEEE80211_SEQ_COUNTER_RX	0
+#define IEEE80211_SEQ_COUNTER_TX	1
+
+typedef enum {
+	SET_KEY, DISABLE_KEY, REMOVE_ALL_KEYS,
+} set_key_cmd;
+
+/* This is driver-visible part of the per-hw state the stack keeps. */
+struct ieee80211_hw {
+	/* points to the cfg80211 wiphy for this piece. Note
+	 * that you must fill in the perm_addr and dev fields
+	 * of this structure, use the macros provided below. */
+	struct wiphy *wiphy;
+
+	/* assigned by mac80211, don't write */
+	struct ieee80211_conf conf;
+
+	/* Single thread workqueue available for driver use
+	 * Allocated by mac80211 on registration */
+	struct workqueue_struct *workqueue;
+
+	/* Pointer to the private area that was
+	 * allocated with this struct for you. */
+	void *priv;
+
+	/* The rest is information about your hardware */
+
+	/* TODO: frame_type 802.11/802.3, sw_encryption requirements */
+
+	/* Some wireless LAN chipsets generate beacons in the hardware/firmware
+	 * and others rely on host generated beacons. This option is used to
+	 * configure the upper layer IEEE 802.11 module to generate beacons.
+	 * The low-level driver can use ieee80211_beacon_get() to fetch the
+	 * next beacon frame. */
+#define IEEE80211_HW_HOST_GEN_BEACON (1<<0)
+
+	/* The device needs to be supplied with a beacon template only. */
+#define IEEE80211_HW_HOST_GEN_BEACON_TEMPLATE (1<<1)
+
+	/* Some devices handle decryption internally and do not
+	 * indicate whether the frame was encrypted (unencrypted frames
+	 * will be dropped by the hardware, unless specifically allowed
+	 * through) */
+#define IEEE80211_HW_DEVICE_HIDES_WEP (1<<2)
+
+	/* Whether RX frames passed to ieee80211_rx() include FCS in the end */
+#define IEEE80211_HW_RX_INCLUDES_FCS (1<<3)
+
+	/* Some wireless LAN chipsets buffer broadcast/multicast frames for
+	 * power saving stations in the hardware/firmware and others rely on
+	 * the host system for such buffering. This option is used to
+	 * configure the IEEE 802.11 upper layer to buffer broadcast/multicast
+	 * frames when there are power saving stations so that low-level driver
+	 * can fetch them with ieee80211_get_buffered_bc(). */
+#define IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING (1<<4)
+
+#define IEEE80211_HW_WEP_INCLUDE_IV (1<<5)
+
+	/* will data nullfunc frames get proper TX status callback */
+#define IEEE80211_HW_DATA_NULLFUNC_ACK (1<<6)
+
+	/* Force software encryption for TKIP packets if WMM is enabled. */
+#define IEEE80211_HW_NO_TKIP_WMM_HWACCEL (1<<7)
+
+	/* Some devices handle Michael MIC internally and do not include MIC in
+	 * the received packets passed up. device_strips_mic must be set
+	 * for such devices. The 'encryption' frame control bit is expected to
+	 * be still set in the IEEE 802.11 header with this option unlike with
+	 * the device_hides_wep configuration option.
+	 */
+#define IEEE80211_HW_DEVICE_STRIPS_MIC (1<<8)
+
+	/* Device is capable of performing full monitor mode even during
+	 * normal operation. */
+#define IEEE80211_HW_MONITOR_DURING_OPER (1<<9)
+
+	/* Device does not need BSSID filter set to broadcast in order to
+	 * receive all probe responses while scanning */
+#define IEEE80211_HW_NO_PROBE_FILTERING (1<<10)
+
+	/* Channels are already configured to the default regulatory domain
+	 * specified in the device's EEPROM */
+#define IEEE80211_HW_DEFAULT_REG_DOMAIN_CONFIGURED (1<<11)
+
+	/* calculate Michael MIC for an MSDU when doing hwcrypto */
+#define IEEE80211_HW_TKIP_INCLUDE_MMIC (1<<12)
+	/* Do TKIP phase1 key mixing in stack to support cards only do
+	 * phase2 key mixing when doing hwcrypto */
+#define IEEE80211_HW_TKIP_REQ_PHASE1_KEY (1<<13)
+	/* Do TKIP phase1 and phase2 key mixing in stack and send the generated
+	 * per-packet RC4 key with each TX frame when doing hwcrypto */
+#define IEEE80211_HW_TKIP_REQ_PHASE2_KEY (1<<14)
+
+	u32 flags;			/* hardware flags defined above */
+
+	/* Set to the size of a needed device specific skb headroom for TX skbs. */
+	unsigned int extra_tx_headroom;
+
+	/* This is the time in us to change channels
+	 */
+	int channel_change_time;
+	/* Maximum values for various statistics.
+	 * Leave at 0 to indicate no support. Use negative numbers for dBm. */
+	s8 max_rssi;
+	s8 max_signal;
+	s8 max_noise;
+
+	/* Number of available hardware TX queues for data packets.
+	 * WMM requires at least four queues. */
+	int queues;
+};
+
+static inline void SET_IEEE80211_DEV(struct ieee80211_hw *hw, struct device *dev)
+{
+	set_wiphy_dev(hw->wiphy, dev);
+}
+
+static inline void SET_IEEE80211_PERM_ADDR(struct ieee80211_hw *hw, u8 *addr)
+{
+	memcpy(hw->wiphy->perm_addr, addr, ETH_ALEN);
+}
+
+/* Configuration block used by the low-level driver to tell the 802.11 code
+ * about supported hardware features and to pass function pointers to callback
+ * functions. */
+struct ieee80211_ops {
+	/* Handler that 802.11 module calls for each transmitted frame.
+	 * skb contains the buffer starting from the IEEE 802.11 header.
+	 * The low-level driver should send the frame out based on
+	 * configuration in the TX control data.
+	 * Must be atomic. */
+	int (*tx)(struct ieee80211_hw *hw, struct sk_buff *skb,
+		  struct ieee80211_tx_control *control);
+
+	/* Handler for performing hardware reset. */
+	int (*reset)(struct ieee80211_hw *hw);
+
+	/* Handler that is called when any netdevice attached to the hardware
+	 * device is set UP for the first time. This can be used, e.g., to
+	 * enable interrupts and beacon sending. */
+	int (*open)(struct ieee80211_hw *hw);
+
+	/* Handler that is called when the last netdevice attached to the
+	 * hardware device is set DOWN. This can be used, e.g., to disable
+	 * interrupts and beacon sending. */
+	int (*stop)(struct ieee80211_hw *hw);
+
+	/* Handler for asking a driver if a new interface can be added (or,
+	 * more exactly, set UP). If the handler returns zero, the interface
+	 * is added. Driver should perform any initialization it needs prior
+	 * to returning zero. By returning non-zero addition of the interface
+	 * is inhibited. Unless monitor_during_oper is set, it is guaranteed
+	 * that monitor interfaces and normal interfaces are mutually
+	 * exclusive. The open() handler is called after add_interface()
+	 * if this is the first device added. At least one of the open()
+	 * open() and add_interface() callbacks has to be assigned. If
+	 * add_interface() is NULL, one STA interface is permitted only. */
+	int (*add_interface)(struct ieee80211_hw *hw,
+			     struct ieee80211_if_init_conf *conf);
+
+	/* Notify a driver that an interface is going down. The stop() handler
+	 * is called prior to this if this is a last interface. */
+	void (*remove_interface)(struct ieee80211_hw *hw,
+				 struct ieee80211_if_init_conf *conf);
+
+	/* Handler for configuration requests. IEEE 802.11 code calls this
+	 * function to change hardware configuration, e.g., channel. */
+	int (*config)(struct ieee80211_hw *hw, struct ieee80211_conf *conf);
+
+	/* Handler for configuration requests related to interfaces (e.g.
+	 * BSSID). */
+	int (*config_interface)(struct ieee80211_hw *hw,
+				int if_id, struct ieee80211_if_conf *conf);
+
+	/* ieee80211 drivers do not have access to the &struct net_device
+	 * that is (are) connected with their device. Hence (and because
+	 * we need to combine the multicast lists and flags for multiple
+	 * virtual interfaces), they cannot assign set_multicast_list.
+	 * The parameters here replace dev->flags and dev->mc_count,
+	 * dev->mc_list is replaced by calling ieee80211_get_mc_list_item.
+	 * Must be atomic. */
+	void (*set_multicast_list)(struct ieee80211_hw *hw,
+				   unsigned short flags, int mc_count);
+
+	/* Set TIM bit handler. If the hardware/firmware takes care of beacon
+	 * generation, IEEE 802.11 code uses this function to tell the
+	 * low-level to set (or clear if set==0) TIM bit for the given aid. If
+	 * host system is used to generate beacons, this handler is not used
+	 * and low-level driver should set it to NULL.
+	 * Must be atomic. */
+	int (*set_tim)(struct ieee80211_hw *hw, int aid, int set);
+
+	/* Set encryption key. IEEE 802.11 module calls this function to set
+	 * encryption keys. addr is ff:ff:ff:ff:ff:ff for default keys and
+	 * station hwaddr for individual keys. aid of the station is given
+	 * to help low-level driver in selecting which key->hw_key_idx to use
+	 * for this key. TX control data will use the hw_key_idx selected by
+	 * the low-level driver.
+	 * Must be atomic. */
+	int (*set_key)(struct ieee80211_hw *hw, set_key_cmd cmd,
+		       u8 *addr, struct ieee80211_key_conf *key, int aid);
+
+	/* Set TX key index for default/broadcast keys. This is needed in cases
+	 * where wlan card is doing full WEP/TKIP encapsulation (wep_include_iv
+	 * is not set), in other cases, this function pointer can be set to
+	 * NULL since the IEEE 802. 11 module takes care of selecting the key
+	 * index for each TX frame. */
+	int (*set_key_idx)(struct ieee80211_hw *hw, int idx);
+
+	/* Enable/disable IEEE 802.1X. This item requests wlan card to pass
+	 * unencrypted EAPOL-Key frames even when encryption is configured.
+	 * If the wlan card does not require such a configuration, this
+	 * function pointer can be set to NULL. */
+	int (*set_ieee8021x)(struct ieee80211_hw *hw, int use_ieee8021x);
+
+	/* Set port authorization state (IEEE 802.1X PAE) to be authorized
+	 * (authorized=1) or unauthorized (authorized=0). This function can be
+	 * used if the wlan hardware or low-level driver implements PAE.
+	 * 80211.o module will anyway filter frames based on authorization
+	 * state, so this function pointer can be NULL if low-level driver does
+	 * not require event notification about port state changes.
+	 * Currently unused. */
+	int (*set_port_auth)(struct ieee80211_hw *hw, u8 *addr,
+			     int authorized);
+
+	/* Ask the hardware to service the scan request, no need to start
+	 * the scan state machine in stack. */
+	int (*hw_scan)(struct ieee80211_hw *hw, u8 *ssid, size_t len);
+
+	/* return low-level statistics */
+	int (*get_stats)(struct ieee80211_hw *hw,
+			 struct ieee80211_low_level_stats *stats);
+
+	/* For devices that generate their own beacons and probe response
+	 * or association responses this updates the state of privacy_invoked
+	 * returns 0 for success or an error number */
+	int (*set_privacy_invoked)(struct ieee80211_hw *hw,
+				   int privacy_invoked);
+
+	/* For devices that have internal sequence counters, allow 802.11
+	 * code to access the current value of a counter */
+	int (*get_sequence_counter)(struct ieee80211_hw *hw,
+				    u8* addr, u8 keyidx, u8 txrx,
+				    u32* iv32, u16* iv16);
+
+	/* Configuration of RTS threshold (if device needs it) */
+	int (*set_rts_threshold)(struct ieee80211_hw *hw, u32 value);
+
+	/* Configuration of fragmentation threshold.
+	 * Assign this if the device does fragmentation by itself,
+	 * if this method is assigned then the stack will not do
+	 * fragmentation. */
+	int (*set_frag_threshold)(struct ieee80211_hw *hw, u32 value);
+
+	/* Configuration of retry limits (if device needs it) */
+	int (*set_retry_limit)(struct ieee80211_hw *hw,
+			       u32 short_retry, u32 long_retr);
+
+	/* Number of STAs in STA table notification (NULL = disabled).
+	 * Must be atomic. */
+	void (*sta_table_notification)(struct ieee80211_hw *hw,
+				       int num_sta);
+
+	/* Configure TX queue parameters (EDCF (aifs, cw_min, cw_max),
+	 * bursting) for a hardware TX queue.
+	 * queue = IEEE80211_TX_QUEUE_*.
+	 * Must be atomic. */
+	int (*conf_tx)(struct ieee80211_hw *hw, int queue,
+		       const struct ieee80211_tx_queue_params *params);
+
+	/* Get statistics of the current TX queue status. This is used to get
+	 * number of currently queued packets (queue length), maximum queue
+	 * size (limit), and total number of packets sent using each TX queue
+	 * (count).
+	 * Currently unused. */
+	int (*get_tx_stats)(struct ieee80211_hw *hw,
+			    struct ieee80211_tx_queue_stats *stats);
+
+	/* Get the current TSF timer value from firmware/hardware. Currently,
+	 * this is only used for IBSS mode debugging and, as such, is not a
+	 * required function.
+	 * Must be atomic. */
+	u64 (*get_tsf)(struct ieee80211_hw *hw);
+
+	/* Reset the TSF timer and allow firmware/hardware to synchronize with
+	 * other STAs in the IBSS. This is only used in IBSS mode. This
+	 * function is optional if the firmware/hardware takes full care of
+	 * TSF synchronization. */
+	void (*reset_tsf)(struct ieee80211_hw *hw);
+
+	/* Setup beacon data for IBSS beacons. Unlike access point (Master),
+	 * IBSS uses a fixed beacon frame which is configured using this
+	 * function. This handler is required only for IBSS mode. */
+	int (*beacon_update)(struct ieee80211_hw *hw,
+			     struct sk_buff *skb,
+			     struct ieee80211_tx_control *control);
+
+	/* Determine whether the last IBSS beacon was sent by us. This is
+	 * needed only for IBSS mode and the result of this function is used to
+	 * determine whether to reply to Probe Requests. */
+	int (*tx_last_beacon)(struct ieee80211_hw *hw);
+};
+
+/* Allocate a new hardware device. This must be called once for each
+ * hardware device. The returned pointer must be used to refer to this
+ * device when calling other functions. 802.11 code allocates a private data
+ * area for the low-level driver. The size of this area is given as
+ * priv_data_len.
+ */
+struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
+					const struct ieee80211_ops *ops);
+
+/* Register hardware device to the IEEE 802.11 code and kernel. Low-level
+ * drivers must call this function before using any other IEEE 802.11
+ * function except ieee80211_register_hwmode. */
+int ieee80211_register_hw(struct ieee80211_hw *hw);
+
+/* driver can use this and ieee80211_get_rx_led_name to get the
+ * name of the registered LEDs after ieee80211_register_hw
+ * was called.
+ * This is useful to set the default trigger on the LED class
+ * device that your driver should export for each LED the device
+ * has, that way the default behaviour will be as expected but
+ * the user can still change it/turn off the LED etc.
+ */
+#ifdef CONFIG_MAC80211_LEDS
+extern char *__ieee80211_get_tx_led_name(struct ieee80211_hw *hw);
+extern char *__ieee80211_get_rx_led_name(struct ieee80211_hw *hw);
+#endif
+static inline char *ieee80211_get_tx_led_name(struct ieee80211_hw *hw)
+{
+#ifdef CONFIG_MAC80211_LEDS
+	return __ieee80211_get_tx_led_name(hw);
+#else
+	return NULL;
+#endif
+}
+
+static inline char *ieee80211_get_rx_led_name(struct ieee80211_hw *hw)
+{
+#ifdef CONFIG_MAC80211_LEDS
+	return __ieee80211_get_rx_led_name(hw);
+#else
+	return NULL;
+#endif
+}
+
+/* Register a new hardware PHYMODE capability to the stack. */
+int ieee80211_register_hwmode(struct ieee80211_hw *hw,
+			      struct ieee80211_hw_mode *mode);
+
+/* Unregister a hardware device. This function instructs 802.11 code to free
+ * allocated resources and unregister netdevices from the kernel. */
+void ieee80211_unregister_hw(struct ieee80211_hw *hw);
+
+/* Free everything that was allocated including private data of a driver. */
+void ieee80211_free_hw(struct ieee80211_hw *hw);
+
+/* Receive frame callback function. The low-level driver uses this function to
+ * send received frames to the IEEE 802.11 code. Receive buffer (skb) must
+ * start with IEEE 802.11 header. */
+void __ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb,
+		    struct ieee80211_rx_status *status);
+void ieee80211_rx_irqsafe(struct ieee80211_hw *hw,
+			  struct sk_buff *skb,
+			  struct ieee80211_rx_status *status);
+
+/* Transmit status callback function. The low-level driver must call this
+ * function to report transmit status for all the TX frames that had
+ * req_tx_status set in the transmit control fields. In addition, this should
+ * be called at least for all unicast frames to provide information for TX rate
+ * control algorithm. In order to maintain all statistics, this function is
+ * recommended to be called after each frame, including multicast/broadcast, is
+ * sent. */
+void ieee80211_tx_status(struct ieee80211_hw *hw,
+			 struct sk_buff *skb,
+			 struct ieee80211_tx_status *status);
+void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
+				 struct sk_buff *skb,
+				 struct ieee80211_tx_status *status);
+
+/**
+ * ieee80211_beacon_get - beacon generation function
+ * @hw: pointer obtained from ieee80211_alloc_hw().
+ * @if_id: interface ID from &struct ieee80211_if_init_conf.
+ * @control: will be filled with information needed to send this beacon.
+ *
+ * If the beacon frames are generated by the host system (i.e., not in
+ * hardware/firmware), the low-level driver uses this function to receive
+ * the next beacon frame from the 802.11 code. The low-level is responsible
+ * for calling this function before beacon data is needed (e.g., based on
+ * hardware interrupt). Returned skb is used only once and low-level driver
+ * is responsible of freeing it.
+ */
+struct sk_buff *ieee80211_beacon_get(struct ieee80211_hw *hw,
+				     int if_id,
+				     struct ieee80211_tx_control *control);
+
+/**
+ * ieee80211_rts_get - RTS frame generation function
+ * @hw: pointer obtained from ieee80211_alloc_hw().
+ * @frame: pointer to the frame that is going to be protected by the RTS.
+ * @frame_len: the frame length (in octets).
+ * @frame_txctl: &struct ieee80211_tx_control of the frame.
+ * @rts: The buffer where to store the RTS frame.
+ *
+ * If the RTS frames are generated by the host system (i.e., not in
+ * hardware/firmware), the low-level driver uses this function to receive
+ * the next RTS frame from the 802.11 code. The low-level is responsible
+ * for calling this function before and RTS frame is needed.
+ */
+void ieee80211_rts_get(struct ieee80211_hw *hw,
+		       const void *frame, size_t frame_len,
+		       const struct ieee80211_tx_control *frame_txctl,
+		       struct ieee80211_rts *rts);
+
+/**
+ * ieee80211_rts_duration - Get the duration field for an RTS frame
+ * @hw: pointer obtained from ieee80211_alloc_hw().
+ * @frame_len: the length of the frame that is going to be protected by the RTS.
+ * @frame_txctl: &struct ieee80211_tx_control of the frame.
+ *
+ * If the RTS is generated in firmware, but the host system must provide
+ * the duration field, the low-level driver uses this function to receive
+ * the duration field value in little-endian byteorder.
+ */
+__le16 ieee80211_rts_duration(struct ieee80211_hw *hw,
+			      size_t frame_len,
+			      const struct ieee80211_tx_control *frame_txctl);
+
+/**
+ * ieee80211_ctstoself_get - CTS-to-self frame generation function
+ * @hw: pointer obtained from ieee80211_alloc_hw().
+ * @frame: pointer to the frame that is going to be protected by the CTS-to-self.
+ * @frame_len: the frame length (in octets).
+ * @frame_txctl: &struct ieee80211_tx_control of the frame.
+ * @cts: The buffer where to store the CTS-to-self frame.
+ *
+ * If the CTS-to-self frames are generated by the host system (i.e., not in
+ * hardware/firmware), the low-level driver uses this function to receive
+ * the next CTS-to-self frame from the 802.11 code. The low-level is responsible
+ * for calling this function before and CTS-to-self frame is needed.
+ */
+void ieee80211_ctstoself_get(struct ieee80211_hw *hw,
+			     const void *frame, size_t frame_len,
+			     const struct ieee80211_tx_control *frame_txctl,
+			     struct ieee80211_cts *cts);
+
+/**
+ * ieee80211_ctstoself_duration - Get the duration field for a CTS-to-self frame
+ * @hw: pointer obtained from ieee80211_alloc_hw().
+ * @frame_len: the length of the frame that is going to be protected by the CTS-to-self.
+ * @frame_txctl: &struct ieee80211_tx_control of the frame.
+ *
+ * If the CTS-to-self is generated in firmware, but the host system must provide
+ * the duration field, the low-level driver uses this function to receive
+ * the duration field value in little-endian byteorder.
+ */
+__le16 ieee80211_ctstoself_duration(struct ieee80211_hw *hw,
+				    size_t frame_len,
+				    const struct ieee80211_tx_control *frame_txctl);
+
+/**
+ * ieee80211_generic_frame_duration - Calculate the duration field for a frame
+ * @hw: pointer obtained from ieee80211_alloc_hw().
+ * @frame_len: the length of the frame.
+ * @rate: the rate (in 100kbps) at which the frame is going to be transmitted.
+ *
+ * Calculate the duration field of some generic frame, given its
+ * length and transmission rate (in 100kbps).
+ */
+__le16 ieee80211_generic_frame_duration(struct ieee80211_hw *hw,
+					size_t frame_len,
+					int rate);
+
+/**
+ * ieee80211_get_buffered_bc - accessing buffered broadcast and multicast frames
+ * @hw: pointer as obtained from ieee80211_alloc_hw().
+ * @if_id: interface ID from &struct ieee80211_if_init_conf.
+ * @control: will be filled with information needed to send returned frame.
+ *
+ * Function for accessing buffered broadcast and multicast frames. If
+ * hardware/firmware does not implement buffering of broadcast/multicast
+ * frames when power saving is used, 802.11 code buffers them in the host
+ * memory. The low-level driver uses this function to fetch next buffered
+ * frame. In most cases, this is used when generating beacon frame. This
+ * function returns a pointer to the next buffered skb or NULL if no more
+ * buffered frames are available.
+ *
+ * Note: buffered frames are returned only after DTIM beacon frame was
+ * generated with ieee80211_beacon_get() and the low-level driver must thus
+ * call ieee80211_beacon_get() first. ieee80211_get_buffered_bc() returns
+ * NULL if the previous generated beacon was not DTIM, so the low-level driver
+ * does not need to check for DTIM beacons separately and should be able to
+ * use common code for all beacons.
+ */
+struct sk_buff *
+ieee80211_get_buffered_bc(struct ieee80211_hw *hw, int if_id,
+			  struct ieee80211_tx_control *control);
+
+/* Low level drivers that have their own MLME and MAC indicate
+ * the aid for an associating station with this call */
+int ieee80211_set_aid_for_sta(struct ieee80211_hw *hw,
+			      u8 *peer_address, u16 aid);
+
+
+/* Given an sk_buff with a raw 802.11 header at the data pointer this function
+ * returns the 802.11 header length in bytes (not including encryption
+ * headers). If the data in the sk_buff is too short to contain a valid 802.11
+ * header the function returns 0.
+ */
+int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb);
+
+/* Like ieee80211_get_hdrlen_from_skb() but takes a FC in CPU order. */
+int ieee80211_get_hdrlen(u16 fc);
+
+/**
+ * ieee80211_wake_queue - wake specific queue
+ * @hw: pointer as obtained from ieee80211_alloc_hw().
+ * @queue: queue number (counted from zero).
+ *
+ * Drivers should use this function instead of netif_wake_queue.
+ */
+void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue);
+
+/**
+ * ieee80211_stop_queue - stop specific queue
+ * @hw: pointer as obtained from ieee80211_alloc_hw().
+ * @queue: queue number (counted from zero).
+ *
+ * Drivers should use this function instead of netif_stop_queue.
+ */
+void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue);
+
+/**
+ * ieee80211_start_queues - start all queues
+ * @hw: pointer to as obtained from ieee80211_alloc_hw().
+ *
+ * Drivers should use this function instead of netif_start_queue.
+ */
+void ieee80211_start_queues(struct ieee80211_hw *hw);
+
+/**
+ * ieee80211_stop_queues - stop all queues
+ * @hw: pointer as obtained from ieee80211_alloc_hw().
+ *
+ * Drivers should use this function instead of netif_stop_queue.
+ */
+void ieee80211_stop_queues(struct ieee80211_hw *hw);
+
+/**
+ * ieee80211_wake_queues - wake all queues
+ * @hw: pointer as obtained from ieee80211_alloc_hw().
+ *
+ * Drivers should use this function instead of netif_wake_queue.
+ */
+void ieee80211_wake_queues(struct ieee80211_hw *hw);
+
+/**
+ * ieee80211_get_mc_list_item - iteration over items in multicast list
+ * @hw: pointer as obtained from ieee80211_alloc_hw().
+ * @prev: value returned by previous call to ieee80211_get_mc_list_item() or
+ *	NULL to start a new iteration.
+ * @ptr: pointer to buffer of void * type for internal usage of
+ *	ieee80211_get_mc_list_item().
+ *
+ * Iterates over items in multicast list of given device. To get the first
+ * item, pass NULL in @prev and in *@ptr. In subsequent calls, pass the
+ * value returned by previous call in @prev. Don't alter *@ptr during
+ * iteration. When there are no more items, NULL is returned.
+ */
+struct dev_mc_list *
+ieee80211_get_mc_list_item(struct ieee80211_hw *hw,
+			   struct dev_mc_list *prev,
+			   void **ptr);
+
+/* called by driver to notify scan status completed */
+void ieee80211_scan_completed(struct ieee80211_hw *hw);
+
+/* Function to indicate Radar Detection. The low level driver must call this
+ * function to indicate the presence of radar in the current channel.
+ * Additionally the radar type also could be sent */
+int  ieee80211_radar_status(struct ieee80211_hw *hw, int channel,
+			    int radar, int radar_type);
+
+/* return a pointer to the source address (SA) */
+static inline u8 *ieee80211_get_SA(struct ieee80211_hdr *hdr)
+{
+	u8 *raw = (u8 *) hdr;
+	u8 tofrom = (*(raw+1)) & 3; /* get the TODS and FROMDS bits */
+
+	switch (tofrom) {
+		case 2:
+			return hdr->addr3;
+		case 3:
+			return hdr->addr4;
+	}
+	return hdr->addr2;
+}
+
+/* return a pointer to the destination address (DA) */
+static inline u8 *ieee80211_get_DA(struct ieee80211_hdr *hdr)
+{
+	u8 *raw = (u8 *) hdr;
+	u8 to_ds = (*(raw+1)) & 1; /* get the TODS bit */
+
+	if (to_ds)
+		return hdr->addr3;
+	return hdr->addr1;
+}
+
+static inline int ieee80211_get_morefrag(struct ieee80211_hdr *hdr)
+{
+	return (le16_to_cpu(hdr->frame_control) &
+		IEEE80211_FCTL_MOREFRAGS) != 0;
+}
+
+#define MAC_FMT "%02x:%02x:%02x:%02x:%02x:%02x"
+#define MAC_ARG(x) ((u8*)(x))[0], ((u8*)(x))[1], ((u8*)(x))[2], \
+		   ((u8*)(x))[3], ((u8*)(x))[4], ((u8*)(x))[5]
+
+#endif /* MAC80211_H */