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linux/include/net/mac80211.h
Johannes Berg 4480f15ca6 [PATCH] mac80211: clarify some mac80211 things 
The semantics of not having an add_interface callback are not well
defined, this callback is required because otherwise you cannot obtain
the requested MAC address of the device. Change the documentation to
reflect this, add a note about having no MAC address at all, add a
warning that mac_addr in struct ieee80211_if_init_conf can be NULL and
finally verify that a few callbacks are assigned by way of BUG_ON()

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: Jiri Benc <jbenc@suse.cz>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2007-07-12 16:07:26 -04:00

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/*
* 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 pointer will be %NULL for monitor interfaces, be careful.
*
* This structure is used in add_interface() and remove_interface()
* callbacks of &struct ieee80211_hw.
*
* When you allow multiple interfaces to be added to your PHY, take care
* that the hardware can actually handle multiple MAC addresses. However,
* also take care that when there's no interface left with mac_addr != %NULL
* you remove the MAC address from the device to avoid acknowledging packets
* in pure monitor mode.
*/
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. If assigned, the open() handler is called after
* add_interface() if this is the first device added. The
* add_interface() callback has to be assigned because it is the only
* way to obtain the requested MAC address for any interface.
*/
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);
/* 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 */
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