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[PATCH] mac80211: document a lot more
This patch adds a lot more documentation (in kernel-doc format) to include/net/mac80211.h Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: Michael Wu <flamingice@sourmilk.net> Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Johannes Berg
David S. Miller
parent
1bc0826c8f
commit
75a5f0ccfd
@ -22,29 +22,51 @@
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#include <net/wireless.h>
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#include <net/cfg80211.h>
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/* Note! Only ieee80211_tx_status_irqsafe() and ieee80211_rx_irqsafe() can be
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/**
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* DOC: Introduction
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*
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* mac80211 is the Linux stack for 802.11 hardware that implements
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* only partial functionality in hard- or firmware. This document
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* defines the interface between mac80211 and low-level hardware
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* drivers.
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*/
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/**
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* DOC: Calling mac80211 from interrupts
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*
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* Only ieee80211_tx_status_irqsafe() and ieee80211_rx_irqsafe() can be
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* called in hardware interrupt context. The low-level driver must not call any
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* other functions in hardware interrupt context. If there is a need for such
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* call, the low-level driver should first ACK the interrupt and perform the
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* IEEE 802.11 code call after this, e.g., from a scheduled tasklet (in
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* software interrupt context).
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* IEEE 802.11 code call after this, e.g. from a scheduled workqueue function.
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*/
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/*
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* Frame format used when passing frame between low-level hardware drivers
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* and IEEE 802.11 driver the same as used in the wireless media, i.e.,
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* buffers start with IEEE 802.11 header and include the same octets that
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* are sent over air.
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/**
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* DOC: Warning
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*
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* If hardware uses IEEE 802.3 headers (and perform 802.3 <-> 802.11
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* conversion in firmware), upper layer 802.11 code needs to be changed to
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* support this.
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* If you're reading this document and not the header file itself, it will
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* be incomplete because not all documentation has been converted yet.
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*/
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/**
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* DOC: Frame format
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*
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* If the receive frame format is not the same as the real frame sent
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* on the wireless media (e.g., due to padding etc.), upper layer 802.11 code
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* could be updated to provide support for such format assuming this would
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* optimize the performance, e.g., by removing need to re-allocation and
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* copying of the data.
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* As a general rule, when frames are passed between mac80211 and the driver,
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* they start with the IEEE 802.11 header and include the same octets that are
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* sent over the air except for the FCS which should be calculated by the
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* hardware.
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*
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* There are, however, various exceptions to this rule for advanced features:
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*
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* The first exception is for hardware encryption and decryption offload
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* where the IV/ICV may or may not be generated in hardware.
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*
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* Secondly, when the hardware handles fragmentation, the frame handed to
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* the driver from mac80211 is the MSDU, not the MPDU.
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*
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* Finally, for received frames, the driver is able to indicate that it has
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* filled a radiotap header and put that in front of the frame; if it does
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* not do so then mac80211 may add this under certain circumstances.
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*/
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#define IEEE80211_CHAN_W_SCAN 0x00000001
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@ -480,7 +502,7 @@ enum ieee80211_if_types {
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*/
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struct ieee80211_if_init_conf {
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int if_id;
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int type;
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enum ieee80211_if_types type;
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void *mac_addr;
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};
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@ -645,351 +667,426 @@ enum ieee80211_hw_flags {
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/**
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* struct ieee80211_hw - hardware information and state
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* TODO: move documentation into kernel-doc format
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*
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* This structure contains the configuration and hardware
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* information for an 802.11 PHY.
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*
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* @wiphy: This points to the &struct wiphy allocated for this
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* 802.11 PHY. You must fill in the @perm_addr and @dev
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* members of this structure using SET_IEEE80211_DEV()
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* and SET_IEEE80211_PERM_ADDR().
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*
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* @conf: &struct ieee80211_conf, device configuration, don't use.
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*
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* @workqueue: single threaded workqueue available for driver use,
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* allocated by mac80211 on registration and flushed on
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* unregistration.
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*
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* @priv: pointer to private area that was allocated for driver use
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* along with this structure.
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*
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* @flags: hardware flags, see &enum ieee80211_hw_flags.
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*
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* @extra_tx_headroom: headroom to reserve in each transmit skb
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* for use by the driver (e.g. for transmit headers.)
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*
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* @channel_change_time: time (in microseconds) it takes to change channels.
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*
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* @max_rssi: Maximum value for ssi in RX information, use
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* negative numbers for dBm and 0 to indicate no support.
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*
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* @max_signal: like @max_rssi, but for the signal value.
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*
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* @max_noise: like @max_rssi, but for the noise value.
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*
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* @queues: number of available hardware transmit queues for
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* data packets. WMM/QoS requires at least four.
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*/
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struct ieee80211_hw {
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/* points to the cfg80211 wiphy for this piece. Note
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* that you must fill in the perm_addr and dev fields
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* of this structure, use the macros provided below. */
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struct wiphy *wiphy;
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/* assigned by mac80211, don't write */
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struct ieee80211_conf conf;
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/* Single thread workqueue available for driver use
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* Allocated by mac80211 on registration */
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struct wiphy *wiphy;
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struct workqueue_struct *workqueue;
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/* Pointer to the private area that was
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* allocated with this struct for you. */
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void *priv;
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/* The rest is information about your hardware */
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u32 flags; /* hardware flags defined above */
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/* Set to the size of a needed device specific skb headroom for TX skbs. */
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u32 flags;
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unsigned int extra_tx_headroom;
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/* This is the time in us to change channels
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*/
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int channel_change_time;
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/* Maximum values for various statistics.
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* Leave at 0 to indicate no support. Use negative numbers for dBm. */
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u8 queues;
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s8 max_rssi;
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s8 max_signal;
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s8 max_noise;
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/* Number of available hardware TX queues for data packets.
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* WMM requires at least four queues. */
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int queues;
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};
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/**
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* SET_IEEE80211_DEV - set device for 802.11 hardware
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*
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* @hw: the &struct ieee80211_hw to set the device for
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* @dev: the &struct device of this 802.11 device
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*/
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static inline void SET_IEEE80211_DEV(struct ieee80211_hw *hw, struct device *dev)
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{
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set_wiphy_dev(hw->wiphy, dev);
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}
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/**
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* SET_IEEE80211_PERM_ADDR - set the permanenet MAC address for 802.11 hardware
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*
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* @hw: the &struct ieee80211_hw to set the MAC address for
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* @addr: the address to set
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*/
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static inline void SET_IEEE80211_PERM_ADDR(struct ieee80211_hw *hw, u8 *addr)
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{
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memcpy(hw->wiphy->perm_addr, addr, ETH_ALEN);
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}
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/*
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* flags for change_filter_flags()
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/**
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* DOC: Hardware crypto acceleration
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*
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* Note that e.g. if PROMISC_IN_BSS is unset then
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* you should still do MAC address filtering if
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* possible even if OTHER_BSS is set to indicate
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* no BSSID filtering should be done.
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* mac80211 is capable of taking advantage of many hardware
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* acceleration designs for encryption and decryption operations.
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*
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* The set_key() callback in the &struct ieee80211_ops for a given
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* device is called to enable hardware acceleration of encryption and
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* decryption. The callback takes an @address parameter that will be
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* the broadcast address for default keys, the other station's hardware
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* address for individual keys or the zero address for keys that will
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* be used only for transmission.
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* Multiple transmission keys with the same key index may be used when
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* VLANs are configured for an access point.
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*
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* The @local_address parameter will always be set to our own address,
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* this is only relevant if you support multiple local addresses.
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*
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* When transmitting, the TX control data will use the @hw_key_idx
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* selected by the driver by modifying the &struct ieee80211_key_conf
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* pointed to by the @key parameter to the set_key() function.
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*
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* The set_key() call for the %SET_KEY command should return 0 if
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* the key is now in use, -%EOPNOTSUPP or -%ENOSPC if it couldn't be
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* added; if you return 0 then hw_key_idx must be assigned to the
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* hardware key index, you are free to use the full u8 range.
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*
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* When the cmd is %DISABLE_KEY then it must succeed.
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*
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* Note that it is permissible to not decrypt a frame even if a key
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* for it has been uploaded to hardware, the stack will not make any
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* decision based on whether a key has been uploaded or not but rather
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* based on the receive flags.
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*
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* The &struct ieee80211_key_conf structure pointed to by the @key
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* parameter is guaranteed to be valid until another call to set_key()
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* removes it, but it can only be used as a cookie to differentiate
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* keys.
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*/
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/*
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* promiscuous mode within your BSS,
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* think of the BSS as your network segment and then this corresponds
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* to the regular ethernet device promiscuous mode
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*/
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#define FIF_PROMISC_IN_BSS 0x01
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/* show all multicast frames */
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#define FIF_ALLMULTI 0x02
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/* show frames with failed FCS, but set RX_FLAG_FAILED_FCS_CRC for them */
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#define FIF_FCSFAIL 0x04
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/* show frames with failed PLCP CRC, but set RX_FLAG_FAILED_PLCP_CRC for them */
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#define FIF_PLCPFAIL 0x08
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/*
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* This flag is set during scanning to indicate to the hardware
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* that it should not filter beacons or probe responses by BSSID.
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*/
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#define FIF_BCN_PRBRESP_PROMISC 0x10
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/*
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* show control frames, if PROMISC_IN_BSS is not set then
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* only those addressed to this station
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*/
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#define FIF_CONTROL 0x20
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/* show frames from other BSSes */
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#define FIF_OTHER_BSS 0x40
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/* Configuration block used by the low-level driver to tell the 802.11 code
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* about supported hardware features and to pass function pointers to callback
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* functions. */
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/**
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* DOC: Frame filtering
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*
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* mac80211 requires to see many management frames for proper
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* operation, and users may want to see many more frames when
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* in monitor mode. However, for best CPU usage and power consumption,
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* having as few frames as possible percolate through the stack is
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* desirable. Hence, the hardware should filter as much as possible.
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*
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* To achieve this, mac80211 uses filter flags (see below) to tell
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* the driver's configure_filter() function which frames should be
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* passed to mac80211 and which should be filtered out.
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*
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* The configure_filter() callback is invoked with the parameters
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* @mc_count and @mc_list for the combined multicast address list
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* of all virtual interfaces, @changed_flags telling which flags
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* were changed and @total_flags with the new flag states.
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*
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* If your device has no multicast address filters your driver will
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* need to check both the %FIF_ALLMULTI flag and the @mc_count
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* parameter to see whether multicast frames should be accepted
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* or dropped.
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*
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* All unsupported flags in @total_flags must be cleared, i.e. you
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* should clear all bits except those you honoured.
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*/
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/**
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* enum ieee80211_filter_flags - hardware filter flags
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*
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* These flags determine what the filter in hardware should be
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* programmed to let through and what should not be passed to the
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* stack. It is always safe to pass more frames than requested,
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* but this has negative impact on power consumption.
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*
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* @FIF_PROMISC_IN_BSS: promiscuous mode within your BSS,
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* think of the BSS as your network segment and then this corresponds
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* to the regular ethernet device promiscuous mode.
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*
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* @FIF_ALLMULTI: pass all multicast frames, this is used if requested
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* by the user or if the hardware is not capable of filtering by
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* multicast address.
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*
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* @FIF_FCSFAIL: pass frames with failed FCS (but you need to set the
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* %RX_FLAG_FAILED_FCS_CRC for them)
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*
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* @FIF_PLCPFAIL: pass frames with failed PLCP CRC (but you need to set
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* the %RX_FLAG_FAILED_PLCP_CRC for them
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*
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* @FIF_BCN_PRBRESP_PROMISC: This flag is set during scanning to indicate
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* to the hardware that it should not filter beacons or probe responses
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* by BSSID. Filtering them can greatly reduce the amount of processing
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* mac80211 needs to do and the amount of CPU wakeups, so you should
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* honour this flag if possible.
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*
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* @FIF_CONTROL: pass control frames, if PROMISC_IN_BSS is not set then
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* only those addressed to this station
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*
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* @FIF_OTHER_BSS: pass frames destined to other BSSes
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*/
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enum ieee80211_filter_flags {
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FIF_PROMISC_IN_BSS = 1<<0,
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FIF_ALLMULTI = 1<<1,
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FIF_FCSFAIL = 1<<2,
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FIF_PLCPFAIL = 1<<3,
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FIF_BCN_PRBRESP_PROMISC = 1<<4,
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FIF_CONTROL = 1<<5,
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FIF_OTHER_BSS = 1<<6,
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};
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/**
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* enum ieee80211_erp_change_flags - erp change flags
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*
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* These flags are used with the erp_ie_changed() callback in
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* &struct ieee80211_ops to indicate which parameter(s) changed.
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* @IEEE80211_ERP_CHANGE_PROTECTION: protection changed
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* @IEEE80211_ERP_CHANGE_PREAMBLE: barker preamble mode changed
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*/
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enum ieee80211_erp_change_flags {
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IEEE80211_ERP_CHANGE_PROTECTION = 1<<0,
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IEEE80211_ERP_CHANGE_PREAMBLE = 1<<1,
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};
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/**
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* struct ieee80211_ops - callbacks from mac80211 to the driver
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*
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* This structure contains various callbacks that the driver may
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* handle or, in some cases, must handle, for example to configure
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* the hardware to a new channel or to transmit a frame.
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*
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* @tx: Handler that 802.11 module calls for each transmitted frame.
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* skb contains the buffer starting from the IEEE 802.11 header.
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* The low-level driver should send the frame out based on
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* configuration in the TX control data. Must be implemented and
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* atomic.
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*
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* @start: Called before the first netdevice attached to the hardware
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* is enabled. This should turn on the hardware and must turn on
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* frame reception (for possibly enabled monitor interfaces.)
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* Returns negative error codes, these may be seen in userspace,
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* or zero.
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* When the device is started it should not have a MAC address
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* to avoid acknowledging frames before a non-monitor device
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* is added.
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* Must be implemented.
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*
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* @stop: Called after last netdevice attached to the hardware
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* is disabled. This should turn off the hardware (at least
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* it must turn off frame reception.)
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* May be called right after add_interface if that rejects
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* an interface.
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* Must be implemented.
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*
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* @add_interface: Called when a netdevice attached to the hardware is
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* enabled. Because it is not called for monitor mode devices, @open
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* and @stop must be implemented.
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* The driver should perform any initialization it needs before
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* the device can be enabled. The initial configuration for the
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* interface is given in the conf parameter.
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* The callback may refuse to add an interface by returning a
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* negative error code (which will be seen in userspace.)
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* Must be implemented.
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*
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* @remove_interface: Notifies a driver that an interface is going down.
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* The @stop callback is called after this if it is the last interface
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* and no monitor interfaces are present.
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* When all interfaces are removed, the MAC address in the hardware
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* must be cleared so the device no longer acknowledges packets,
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* the mac_addr member of the conf structure is, however, set to the
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* MAC address of the device going away.
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* Hence, this callback must be implemented.
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*
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* @config: Handler for configuration requests. IEEE 802.11 code calls this
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* function to change hardware configuration, e.g., channel.
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*
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* @config_interface: Handler for configuration requests related to interfaces
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* (e.g. BSSID changes.)
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*
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* @configure_filter: Configure the device's RX filter.
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* See the section "Frame filtering" for more information.
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* This callback must be implemented and atomic.
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*
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* @set_tim: Set TIM bit. If the hardware/firmware takes care of beacon
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* generation (that is, %IEEE80211_HW_HOST_GEN_BEACON_TEMPLATE is set)
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* mac80211 calls this function when a TIM bit must be set or cleared
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* for a given AID. Must be atomic.
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*
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* @set_key: See the section "Hardware crypto acceleration"
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* This callback can sleep, and is only called between add_interface
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* and remove_interface calls, i.e. while the interface with the
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* given local_address is enabled.
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*
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* @set_ieee8021x: Enable/disable IEEE 802.1X. This item requests wlan card
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* to pass unencrypted EAPOL-Key frames even when encryption is
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* configured. If the wlan card does not require such a configuration,
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* this function pointer can be set to NULL.
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*
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* @set_port_auth: Set port authorization state (IEEE 802.1X PAE) to be
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* authorized (@authorized=1) or unauthorized (=0). This function can be
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* used if the wlan hardware or low-level driver implements PAE.
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* mac80211 will filter frames based on authorization state in any case,
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* so this function pointer can be NULL if low-level driver does not
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* require event notification about port state changes.
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*
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* @hw_scan: Ask the hardware to service the scan request, no need to start
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* the scan state machine in stack.
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*
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* @get_stats: return low-level statistics
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*
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* @set_privacy_invoked: For devices that generate their own beacons and probe
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* response or association responses this updates the state of privacy_invoked
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* returns 0 for success or an error number.
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*
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* @get_sequence_counter: For devices that have internal sequence counters this
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* callback allows mac80211 to access the current value of a counter.
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* This callback seems not well-defined, tell us if you need it.
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*
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* @set_rts_threshold: Configuration of RTS threshold (if device needs it)
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*
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* @set_frag_threshold: 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.
|
||||
*
|
||||
* @set_retry_limit: Configuration of retry limits (if device needs it)
|
||||
*
|
||||
* @sta_table_notification: Number of STAs in STA table notification. Must
|
||||
* be atomic.
|
||||
*
|
||||
* @erp_ie_changed: Handle ERP IE change notifications. Must be atomic.
|
||||
*
|
||||
* @conf_tx: Configure TX queue parameters (EDCF (aifs, cw_min, cw_max),
|
||||
* bursting) for a hardware TX queue. The @queue parameter uses the
|
||||
* %IEEE80211_TX_QUEUE_* constants. Must be atomic.
|
||||
*
|
||||
* @get_tx_stats: 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). This information is used for WMM to find out which TX
|
||||
* queues have room for more packets and by hostapd to provide
|
||||
* statistics about the current queueing state to external programs.
|
||||
*
|
||||
* @get_tsf: 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.
|
||||
*
|
||||
* @reset_tsf: 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.
|
||||
*
|
||||
* @beacon_update: Setup beacon data for IBSS beacons. Unlike access point,
|
||||
* IBSS uses a fixed beacon frame which is configured using this
|
||||
* function. This handler is required only for IBSS mode.
|
||||
*
|
||||
* @tx_last_beacon: 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.
|
||||
*/
|
||||
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);
|
||||
|
||||
/*
|
||||
* Called before the first netdevice attached to the hardware
|
||||
* is enabled. This should turn on the hardware and must turn on
|
||||
* frame reception (for possibly enabled monitor interfaces.)
|
||||
* Returns negative error codes, these may be seen in userspace,
|
||||
* or zero.
|
||||
* When the device is started it should not have a MAC address
|
||||
* to avoid acknowledging frames before a non-monitor device
|
||||
* is added.
|
||||
*
|
||||
* Must be implemented.
|
||||
*/
|
||||
int (*start)(struct ieee80211_hw *hw);
|
||||
|
||||
/*
|
||||
* Called after last netdevice attached to the hardware
|
||||
* is disabled. This should turn off the hardware (at least
|
||||
* it must turn off frame reception.)
|
||||
* May be called right after add_interface if that rejects
|
||||
* an interface.
|
||||
*
|
||||
* Must be implemented.
|
||||
*/
|
||||
void (*stop)(struct ieee80211_hw *hw);
|
||||
|
||||
/*
|
||||
* Called when a netdevice attached to the hardware is enabled.
|
||||
* Because it is not called for monitor mode devices, open()
|
||||
* and stop() must be implemented.
|
||||
* The driver should perform any initialization it needs before
|
||||
* the device can be enabled. The initial configuration for the
|
||||
* interface is given in the conf parameter.
|
||||
*
|
||||
* Must be implemented.
|
||||
*/
|
||||
int (*add_interface)(struct ieee80211_hw *hw,
|
||||
struct ieee80211_if_init_conf *conf);
|
||||
|
||||
/*
|
||||
* Notifies a driver that an interface is going down. The stop() handler
|
||||
* is called after this if it is the last interface and no monitor
|
||||
* interfaces are present.
|
||||
* When all interfaces are removed, the MAC address in the hardware
|
||||
* must be cleared so the device no longer acknowledges packets,
|
||||
* the mac_addr member of the conf structure is, however, set to the
|
||||
* MAC address of the device going away.
|
||||
*
|
||||
* Hence, this callback must be implemented.
|
||||
*/
|
||||
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);
|
||||
|
||||
/*
|
||||
* Configure the device's RX filter.
|
||||
*
|
||||
* The multicast address filter must be changed if the hardware flags
|
||||
* indicate that one is present.
|
||||
*
|
||||
* All unsupported flags in 'total_flags' must be cleared,
|
||||
* clear all bits except those you honoured.
|
||||
*
|
||||
* The callback must be implemented and must be atomic.
|
||||
*/
|
||||
void (*configure_filter)(struct ieee80211_hw *hw,
|
||||
unsigned int changed_flags,
|
||||
unsigned int *total_flags,
|
||||
int mc_count, struct dev_addr_list *mc_list);
|
||||
|
||||
/* 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.
|
||||
*
|
||||
* This is called to enable hardware acceleration of encryption and
|
||||
* decryption. The address will be the broadcast address for default
|
||||
* keys, the other station's hardware address for individual keys or
|
||||
* the zero address for keys that will be used only for transmission.
|
||||
*
|
||||
* The local_address parameter will always be set to our own address,
|
||||
* this is only relevant if you support multiple local addresses.
|
||||
*
|
||||
* When transmitting, the TX control data will use the hw_key_idx
|
||||
* selected by the low-level driver.
|
||||
*
|
||||
* Return 0 if the key is now in use, -EOPNOTSUPP or -ENOSPC if it
|
||||
* couldn't be added; if you return 0 then hw_key_idx must be assigned
|
||||
* to the hardware key index, you are free to use the full u8 range.
|
||||
*
|
||||
* When the cmd is DISABLE_KEY then it must succeed.
|
||||
*
|
||||
* Note that it is permissible to not decrypt a frame even if a key
|
||||
* for it has been uploaded to hardware, the stack will not make any
|
||||
* decision based on whether a key has been uploaded or not but rather
|
||||
* based on the receive flags.
|
||||
*
|
||||
* This callback can sleep, and is only called between add_interface
|
||||
* and remove_interface calls, i.e. while the interface with the
|
||||
* given local_address is enabled.
|
||||
*
|
||||
* The ieee80211_key_conf structure pointed to by the key parameter
|
||||
* is guaranteed to be valid until another call to set_key removes
|
||||
* it, but it can only be used as a cookie to differentiate keys.
|
||||
*/
|
||||
int (*set_key)(struct ieee80211_hw *hw, set_key_cmd cmd,
|
||||
const u8 *local_address, const u8 *address,
|
||||
struct ieee80211_key_conf *key);
|
||||
|
||||
/* 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);
|
||||
|
||||
/* Handle ERP IE change notifications. Must be atomic. */
|
||||
void (*erp_ie_changed)(struct ieee80211_hw *hw, u8 changes,
|
||||
int cts_protection, int preamble);
|
||||
|
||||
/* Flags for the erp_ie_changed changes parameter */
|
||||
#define IEEE80211_ERP_CHANGE_PROTECTION (1<<0) /* protection flag changed */
|
||||
#define IEEE80211_ERP_CHANGE_PREAMBLE (1<<1) /* barker preamble mode changed */
|
||||
|
||||
/* 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.
|
||||
/**
|
||||
* ieee80211_alloc_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.
|
||||
* mac80211 allocates a private data area for the driver pointed to by
|
||||
* @priv in &struct ieee80211_hw, the size of this area is given as
|
||||
* @priv_data_len.
|
||||
*
|
||||
* @priv_data_len: length of private data
|
||||
* @ops: callbacks for this device
|
||||
*/
|
||||
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. */
|
||||
/**
|
||||
* ieee80211_register_hw - Register hardware device
|
||||
*
|
||||
* You must call this function before any other functions
|
||||
* except ieee80211_register_hwmode.
|
||||
*
|
||||
* @hw: the device to register as returned by ieee80211_alloc_hw()
|
||||
*/
|
||||
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
|
||||
/**
|
||||
* ieee80211_get_tx_led_name - get name of TX LED
|
||||
*
|
||||
* mac80211 creates a transmit LED trigger for each wireless hardware
|
||||
* that can be used to drive LEDs if your driver registers a LED device.
|
||||
* This function returns the name (or %NULL if not configured for LEDs)
|
||||
* of the trigger so you can automatically link the LED device.
|
||||
*
|
||||
* @hw: the hardware to get the LED trigger name for
|
||||
*/
|
||||
static inline char *ieee80211_get_tx_led_name(struct ieee80211_hw *hw)
|
||||
{
|
||||
#ifdef CONFIG_MAC80211_LEDS
|
||||
@ -999,6 +1096,16 @@ static inline char *ieee80211_get_tx_led_name(struct ieee80211_hw *hw)
|
||||
#endif
|
||||
}
|
||||
|
||||
/**
|
||||
* ieee80211_get_rx_led_name - get name of RX LED
|
||||
*
|
||||
* mac80211 creates a receive LED trigger for each wireless hardware
|
||||
* that can be used to drive LEDs if your driver registers a LED device.
|
||||
* This function returns the name (or %NULL if not configured for LEDs)
|
||||
* of the trigger so you can automatically link the LED device.
|
||||
*
|
||||
* @hw: the hardware to get the LED trigger name for
|
||||
*/
|
||||
static inline char *ieee80211_get_rx_led_name(struct ieee80211_hw *hw)
|
||||
{
|
||||
#ifdef CONFIG_MAC80211_LEDS
|
||||
@ -1012,29 +1119,80 @@ static inline char *ieee80211_get_rx_led_name(struct ieee80211_hw *hw)
|
||||
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. */
|
||||
/**
|
||||
* ieee80211_unregister_hw - Unregister a hardware device
|
||||
*
|
||||
* This function instructs mac80211 to free allocated resources
|
||||
* and unregister netdevices from the networking subsystem.
|
||||
*
|
||||
* @hw: the hardware to unregister
|
||||
*/
|
||||
void ieee80211_unregister_hw(struct ieee80211_hw *hw);
|
||||
|
||||
/* Free everything that was allocated including private data of a driver. */
|
||||
/**
|
||||
* ieee80211_free_hw - free hardware descriptor
|
||||
*
|
||||
* This function frees everything that was allocated, including the
|
||||
* private data for the driver. You must call ieee80211_unregister_hw()
|
||||
* before calling this function
|
||||
*
|
||||
* @hw: the hardware to free
|
||||
*/
|
||||
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. */
|
||||
/* trick to avoid symbol clashes with the ieee80211 subsystem */
|
||||
void __ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb,
|
||||
struct ieee80211_rx_status *status);
|
||||
|
||||
/**
|
||||
* ieee80211_rx - receive frame
|
||||
*
|
||||
* Use this function to hand received frames to mac80211. The receive
|
||||
* buffer in @skb must start with an IEEE 802.11 header or a radiotap
|
||||
* header if %RX_FLAG_RADIOTAP is set in the @status flags.
|
||||
*
|
||||
* This function may not be called in IRQ context.
|
||||
*
|
||||
* @hw: the hardware this frame came in on
|
||||
* @skb: the buffer to receive, owned by mac80211 after this call
|
||||
* @status: status of this frame; the status pointer need not be valid
|
||||
* after this function returns
|
||||
*/
|
||||
static inline void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb,
|
||||
struct ieee80211_rx_status *status)
|
||||
{
|
||||
__ieee80211_rx(hw, skb, status);
|
||||
}
|
||||
|
||||
/**
|
||||
* ieee80211_rx_irqsafe - receive frame
|
||||
*
|
||||
* Like ieee80211_rx() but can be called in IRQ context
|
||||
* (internally defers to a workqueue.)
|
||||
*
|
||||
* @hw: the hardware this frame came in on
|
||||
* @skb: the buffer to receive, owned by mac80211 after this call
|
||||
* @status: status of this frame; the status pointer need not be valid
|
||||
* after this function returns and is not freed by mac80211,
|
||||
* it is recommended that it points to a stack area
|
||||
*/
|
||||
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. */
|
||||
/**
|
||||
* ieee80211_tx_status - transmit status callback
|
||||
*
|
||||
* Call this function for all transmitted frames after they have been
|
||||
* transmitted. It is permissible to not call this function for
|
||||
* multicast frames but this can affect statistics.
|
||||
*
|
||||
* @hw: the hardware the frame was transmitted by
|
||||
* @skb: the frame that was transmitted, owned by mac80211 after this call
|
||||
* @status: status information for this frame; the status pointer need not
|
||||
* be valid after this function returns and is not freed by mac80211,
|
||||
* it is recommended that it points to a stack area
|
||||
*/
|
||||
void ieee80211_tx_status(struct ieee80211_hw *hw,
|
||||
struct sk_buff *skb,
|
||||
struct ieee80211_tx_status *status);
|
||||
@ -1166,14 +1324,26 @@ 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
|
||||
/**
|
||||
* ieee80211_get_hdrlen_from_skb - get header length from data
|
||||
*
|
||||
* Given an skb 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.
|
||||
*
|
||||
* @skb: the frame
|
||||
*/
|
||||
int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb);
|
||||
|
||||
/* Like ieee80211_get_hdrlen_from_skb() but takes a FC in CPU order. */
|
||||
/**
|
||||
* ieee80211_get_hdrlen - get header length from frame control
|
||||
*
|
||||
* This function returns the 802.11 header length in bytes (not including
|
||||
* encryption headers.)
|
||||
*
|
||||
* @fc: the frame control field (in CPU endianness)
|
||||
*/
|
||||
int ieee80211_get_hdrlen(u16 fc);
|
||||
|
||||
/**
|
||||
@ -1218,10 +1388,28 @@ void ieee80211_stop_queues(struct ieee80211_hw *hw);
|
||||
*/
|
||||
void ieee80211_wake_queues(struct ieee80211_hw *hw);
|
||||
|
||||
/* called by driver to notify scan status completed */
|
||||
/**
|
||||
* ieee80211_scan_completed - completed hardware scan
|
||||
*
|
||||
* When hardware scan offload is used (i.e. the hw_scan() callback is
|
||||
* assigned) this function needs to be called by the driver to notify
|
||||
* mac80211 that the scan finished.
|
||||
*
|
||||
* @hw: the hardware that finished the scan
|
||||
*/
|
||||
void ieee80211_scan_completed(struct ieee80211_hw *hw);
|
||||
|
||||
/* return a pointer to the source address (SA) */
|
||||
/**
|
||||
* ieee80211_get_SA - get pointer to SA
|
||||
*
|
||||
* Given an 802.11 frame, this function returns the offset
|
||||
* to the source address (SA). It does not verify that the
|
||||
* header is long enough to contain the address, and the
|
||||
* header must be long enough to contain the frame control
|
||||
* field.
|
||||
*
|
||||
* @hdr: the frame
|
||||
*/
|
||||
static inline u8 *ieee80211_get_SA(struct ieee80211_hdr *hdr)
|
||||
{
|
||||
u8 *raw = (u8 *) hdr;
|
||||
@ -1236,7 +1424,17 @@ static inline u8 *ieee80211_get_SA(struct ieee80211_hdr *hdr)
|
||||
return hdr->addr2;
|
||||
}
|
||||
|
||||
/* return a pointer to the destination address (DA) */
|
||||
/**
|
||||
* ieee80211_get_DA - get pointer to DA
|
||||
*
|
||||
* Given an 802.11 frame, this function returns the offset
|
||||
* to the destination address (DA). It does not verify that
|
||||
* the header is long enough to contain the address, and the
|
||||
* header must be long enough to contain the frame control
|
||||
* field.
|
||||
*
|
||||
* @hdr: the frame
|
||||
*/
|
||||
static inline u8 *ieee80211_get_DA(struct ieee80211_hdr *hdr)
|
||||
{
|
||||
u8 *raw = (u8 *) hdr;
|
||||
@ -1247,6 +1445,14 @@ static inline u8 *ieee80211_get_DA(struct ieee80211_hdr *hdr)
|
||||
return hdr->addr1;
|
||||
}
|
||||
|
||||
/**
|
||||
* ieee80211_get_morefrag - determine whether the MOREFRAGS bit is set
|
||||
*
|
||||
* This function determines whether the "more fragments" bit is set
|
||||
* in the frame.
|
||||
*
|
||||
* @hdr: the frame
|
||||
*/
|
||||
static inline int ieee80211_get_morefrag(struct ieee80211_hdr *hdr)
|
||||
{
|
||||
return (le16_to_cpu(hdr->frame_control) &
|
||||
|
||||
Loading…
Reference in New Issue
Block a user