395 lines
12 KiB
C
395 lines
12 KiB
C
#ifndef __NET_WIRELESS_H
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#define __NET_WIRELESS_H
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/*
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* 802.11 device management
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*
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* Copyright 2007 Johannes Berg <johannes@sipsolutions.net>
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*/
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#include <linux/netdevice.h>
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#include <linux/debugfs.h>
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#include <linux/list.h>
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#include <net/cfg80211.h>
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/**
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* enum ieee80211_band - supported frequency bands
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*
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* The bands are assigned this way because the supported
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* bitrates differ in these bands.
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*
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* @IEEE80211_BAND_2GHZ: 2.4GHz ISM band
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* @IEEE80211_BAND_5GHZ: around 5GHz band (4.9-5.7)
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*/
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enum ieee80211_band {
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IEEE80211_BAND_2GHZ,
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IEEE80211_BAND_5GHZ,
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/* keep last */
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IEEE80211_NUM_BANDS
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};
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/**
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* enum ieee80211_channel_flags - channel flags
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*
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* Channel flags set by the regulatory control code.
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*
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* @IEEE80211_CHAN_DISABLED: This channel is disabled.
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* @IEEE80211_CHAN_PASSIVE_SCAN: Only passive scanning is permitted
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* on this channel.
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* @IEEE80211_CHAN_NO_IBSS: IBSS is not allowed on this channel.
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* @IEEE80211_CHAN_RADAR: Radar detection is required on this channel.
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* @IEEE80211_CHAN_NO_FAT_ABOVE: extension channel above this channel
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* is not permitted.
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* @IEEE80211_CHAN_NO_FAT_BELOW: extension channel below this channel
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* is not permitted.
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*/
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enum ieee80211_channel_flags {
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IEEE80211_CHAN_DISABLED = 1<<0,
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IEEE80211_CHAN_PASSIVE_SCAN = 1<<1,
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IEEE80211_CHAN_NO_IBSS = 1<<2,
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IEEE80211_CHAN_RADAR = 1<<3,
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IEEE80211_CHAN_NO_FAT_ABOVE = 1<<4,
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IEEE80211_CHAN_NO_FAT_BELOW = 1<<5,
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};
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/**
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* struct ieee80211_channel - channel definition
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*
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* This structure describes a single channel for use
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* with cfg80211.
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*
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* @center_freq: center frequency in MHz
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* @max_bandwidth: maximum allowed bandwidth for this channel, in MHz
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* @hw_value: hardware-specific value for the channel
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* @flags: channel flags from &enum ieee80211_channel_flags.
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* @orig_flags: channel flags at registration time, used by regulatory
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* code to support devices with additional restrictions
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* @band: band this channel belongs to.
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* @max_antenna_gain: maximum antenna gain in dBi
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* @max_power: maximum transmission power (in dBm)
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* @orig_mag: internal use
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* @orig_mpwr: internal use
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*/
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struct ieee80211_channel {
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enum ieee80211_band band;
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u16 center_freq;
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u8 max_bandwidth;
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u16 hw_value;
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u32 flags;
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int max_antenna_gain;
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int max_power;
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u32 orig_flags;
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int orig_mag, orig_mpwr;
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};
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/**
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* enum ieee80211_rate_flags - rate flags
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*
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* Hardware/specification flags for rates. These are structured
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* in a way that allows using the same bitrate structure for
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* different bands/PHY modes.
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*
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* @IEEE80211_RATE_SHORT_PREAMBLE: Hardware can send with short
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* preamble on this bitrate; only relevant in 2.4GHz band and
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* with CCK rates.
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* @IEEE80211_RATE_MANDATORY_A: This bitrate is a mandatory rate
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* when used with 802.11a (on the 5 GHz band); filled by the
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* core code when registering the wiphy.
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* @IEEE80211_RATE_MANDATORY_B: This bitrate is a mandatory rate
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* when used with 802.11b (on the 2.4 GHz band); filled by the
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* core code when registering the wiphy.
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* @IEEE80211_RATE_MANDATORY_G: This bitrate is a mandatory rate
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* when used with 802.11g (on the 2.4 GHz band); filled by the
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* core code when registering the wiphy.
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* @IEEE80211_RATE_ERP_G: This is an ERP rate in 802.11g mode.
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*/
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enum ieee80211_rate_flags {
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IEEE80211_RATE_SHORT_PREAMBLE = 1<<0,
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IEEE80211_RATE_MANDATORY_A = 1<<1,
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IEEE80211_RATE_MANDATORY_B = 1<<2,
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IEEE80211_RATE_MANDATORY_G = 1<<3,
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IEEE80211_RATE_ERP_G = 1<<4,
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};
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/**
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* struct ieee80211_rate - bitrate definition
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*
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* This structure describes a bitrate that an 802.11 PHY can
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* operate with. The two values @hw_value and @hw_value_short
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* are only for driver use when pointers to this structure are
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* passed around.
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*
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* @flags: rate-specific flags
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* @bitrate: bitrate in units of 100 Kbps
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* @hw_value: driver/hardware value for this rate
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* @hw_value_short: driver/hardware value for this rate when
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* short preamble is used
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*/
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struct ieee80211_rate {
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u32 flags;
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u16 bitrate;
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u16 hw_value, hw_value_short;
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};
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/**
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* struct ieee80211_ht_info - describing STA's HT capabilities
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*
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* This structure describes most essential parameters needed
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* to describe 802.11n HT capabilities for an STA.
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*
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* @ht_supported: is HT supported by STA, 0: no, 1: yes
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* @cap: HT capabilities map as described in 802.11n spec
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* @ampdu_factor: Maximum A-MPDU length factor
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* @ampdu_density: Minimum A-MPDU spacing
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* @supp_mcs_set: Supported MCS set as described in 802.11n spec
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*/
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struct ieee80211_ht_info {
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u16 cap; /* use IEEE80211_HT_CAP_ */
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u8 ht_supported;
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u8 ampdu_factor;
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u8 ampdu_density;
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u8 supp_mcs_set[16];
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};
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/**
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* struct ieee80211_supported_band - frequency band definition
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*
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* This structure describes a frequency band a wiphy
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* is able to operate in.
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*
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* @channels: Array of channels the hardware can operate in
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* in this band.
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* @band: the band this structure represents
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* @n_channels: Number of channels in @channels
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* @bitrates: Array of bitrates the hardware can operate with
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* in this band. Must be sorted to give a valid "supported
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* rates" IE, i.e. CCK rates first, then OFDM.
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* @n_bitrates: Number of bitrates in @bitrates
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*/
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struct ieee80211_supported_band {
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struct ieee80211_channel *channels;
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struct ieee80211_rate *bitrates;
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enum ieee80211_band band;
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int n_channels;
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int n_bitrates;
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struct ieee80211_ht_info ht_info;
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};
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/**
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* struct wiphy - wireless hardware description
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* @idx: the wiphy index assigned to this item
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* @class_dev: the class device representing /sys/class/ieee80211/<wiphy-name>
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* @reg_notifier: the driver's regulatory notification callback
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*/
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struct wiphy {
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/* assign these fields before you register the wiphy */
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/* permanent MAC address */
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u8 perm_addr[ETH_ALEN];
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/* Supported interface modes, OR together BIT(NL80211_IFTYPE_...) */
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u16 interface_modes;
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/* If multiple wiphys are registered and you're handed e.g.
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* a regular netdev with assigned ieee80211_ptr, you won't
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* know whether it points to a wiphy your driver has registered
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* or not. Assign this to something global to your driver to
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* help determine whether you own this wiphy or not. */
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void *privid;
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struct ieee80211_supported_band *bands[IEEE80211_NUM_BANDS];
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/* Lets us get back the wiphy on the callback */
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int (*reg_notifier)(struct wiphy *wiphy, enum reg_set_by setby);
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/* fields below are read-only, assigned by cfg80211 */
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/* the item in /sys/class/ieee80211/ points to this,
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* you need use set_wiphy_dev() (see below) */
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struct device dev;
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/* dir in debugfs: ieee80211/<wiphyname> */
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struct dentry *debugfsdir;
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char priv[0] __attribute__((__aligned__(NETDEV_ALIGN)));
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};
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/** struct wireless_dev - wireless per-netdev state
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*
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* This structure must be allocated by the driver/stack
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* that uses the ieee80211_ptr field in struct net_device
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* (this is intentional so it can be allocated along with
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* the netdev.)
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*
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* @wiphy: pointer to hardware description
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* @iftype: interface type
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*/
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struct wireless_dev {
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struct wiphy *wiphy;
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enum nl80211_iftype iftype;
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/* private to the generic wireless code */
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struct list_head list;
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struct net_device *netdev;
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};
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/**
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* wiphy_priv - return priv from wiphy
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*/
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static inline void *wiphy_priv(struct wiphy *wiphy)
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{
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BUG_ON(!wiphy);
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return &wiphy->priv;
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}
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/**
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* set_wiphy_dev - set device pointer for wiphy
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*/
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static inline void set_wiphy_dev(struct wiphy *wiphy, struct device *dev)
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{
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wiphy->dev.parent = dev;
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}
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/**
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* wiphy_dev - get wiphy dev pointer
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*/
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static inline struct device *wiphy_dev(struct wiphy *wiphy)
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{
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return wiphy->dev.parent;
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}
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/**
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* wiphy_name - get wiphy name
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*/
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static inline char *wiphy_name(struct wiphy *wiphy)
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{
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return wiphy->dev.bus_id;
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}
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/**
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* wdev_priv - return wiphy priv from wireless_dev
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*/
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static inline void *wdev_priv(struct wireless_dev *wdev)
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{
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BUG_ON(!wdev);
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return wiphy_priv(wdev->wiphy);
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}
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/**
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* wiphy_new - create a new wiphy for use with cfg80211
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*
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* create a new wiphy and associate the given operations with it.
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* @sizeof_priv bytes are allocated for private use.
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*
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* the returned pointer must be assigned to each netdev's
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* ieee80211_ptr for proper operation.
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*/
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struct wiphy *wiphy_new(struct cfg80211_ops *ops, int sizeof_priv);
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/**
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* wiphy_register - register a wiphy with cfg80211
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*
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* register the given wiphy
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*
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* Returns a non-negative wiphy index or a negative error code.
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*/
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extern int wiphy_register(struct wiphy *wiphy);
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/**
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* wiphy_unregister - deregister a wiphy from cfg80211
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*
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* unregister a device with the given priv pointer.
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* After this call, no more requests can be made with this priv
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* pointer, but the call may sleep to wait for an outstanding
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* request that is being handled.
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*/
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extern void wiphy_unregister(struct wiphy *wiphy);
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/**
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* wiphy_free - free wiphy
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*/
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extern void wiphy_free(struct wiphy *wiphy);
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/**
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* ieee80211_channel_to_frequency - convert channel number to frequency
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*/
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extern int ieee80211_channel_to_frequency(int chan);
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/**
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* ieee80211_frequency_to_channel - convert frequency to channel number
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*/
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extern int ieee80211_frequency_to_channel(int freq);
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/*
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* Name indirection necessary because the ieee80211 code also has
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* a function named "ieee80211_get_channel", so if you include
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* cfg80211's header file you get cfg80211's version, if you try
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* to include both header files you'll (rightfully!) get a symbol
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* clash.
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*/
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extern struct ieee80211_channel *__ieee80211_get_channel(struct wiphy *wiphy,
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int freq);
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/**
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* ieee80211_get_channel - get channel struct from wiphy for specified frequency
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*/
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static inline struct ieee80211_channel *
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ieee80211_get_channel(struct wiphy *wiphy, int freq)
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{
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return __ieee80211_get_channel(wiphy, freq);
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}
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/**
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* __regulatory_hint - hint to the wireless core a regulatory domain
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* @wiphy: if a driver is providing the hint this is the driver's very
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* own &struct wiphy
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* @alpha2: the ISO/IEC 3166 alpha2 being claimed the regulatory domain
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* should be in. If @rd is set this should be NULL
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* @rd: a complete regulatory domain, if passed the caller need not worry
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* about freeing it
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*
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* The Wireless subsystem can use this function to hint to the wireless core
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* what it believes should be the current regulatory domain by
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* giving it an ISO/IEC 3166 alpha2 country code it knows its regulatory
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* domain should be in or by providing a completely build regulatory domain.
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*
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* Returns -EALREADY if *a regulatory domain* has already been set. Note that
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* this could be by another driver. It is safe for drivers to continue if
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* -EALREADY is returned, if drivers are not capable of world roaming they
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* should not register more channels than they support. Right now we only
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* support listening to the first driver hint. If the driver is capable
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* of world roaming but wants to respect its own EEPROM mappings for
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* specific regulatory domains it should register the @reg_notifier callback
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* on the &struct wiphy. Returns 0 if the hint went through fine or through an
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* intersection operation. Otherwise a standard error code is returned.
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*
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*/
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extern int __regulatory_hint(struct wiphy *wiphy, enum reg_set_by set_by,
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const char *alpha2, struct ieee80211_regdomain *rd);
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/**
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* regulatory_hint - driver hint to the wireless core a regulatory domain
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* @wiphy: the driver's very own &struct wiphy
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* @alpha2: the ISO/IEC 3166 alpha2 the driver claims its regulatory domain
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* should be in. If @rd is set this should be NULL. Note that if you
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* set this to NULL you should still set rd->alpha2 to some accepted
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* alpha2.
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* @rd: a complete regulatory domain provided by the driver. If passed
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* the driver does not need to worry about freeing it.
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*
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* Wireless drivers can use this function to hint to the wireless core
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* what it believes should be the current regulatory domain by
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* giving it an ISO/IEC 3166 alpha2 country code it knows its regulatory
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* domain should be in or by providing a completely build regulatory domain.
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* If the driver provides an ISO/IEC 3166 alpha2 userspace will be queried
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* for a regulatory domain structure for the respective country. If
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* a regulatory domain is build and passed you should set the alpha2
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* if possible, otherwise set it to the special value of "99" which tells
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* the wireless core it is unknown. If you pass a built regulatory domain
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* and we return non zero you are in charge of kfree()'ing the structure.
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*
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* See __regulatory_hint() documentation for possible return values.
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*/
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extern int regulatory_hint(struct wiphy *wiphy,
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const char *alpha2, struct ieee80211_regdomain *rd);
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#endif /* __NET_WIRELESS_H */
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