e38f8a7a8b
When devices are world roaming they cannot beacon or do active scan on 5 GHz or on channels 12, 13 and 14 on the 2 GHz band. Although we have a good regulatory API some cards may _always_ world roam, this is also true when a system does not have CRDA present. Devices doing world roaming can still passive scan, if they find a beacon from an AP on one of the world roaming frequencies we make the assumption we can do the same and we also remove the passive scan requirement. This adds support for providing beacon regulatory hints based on scans. This works for devices that do either hardware or software scanning. If a channel has not yet been marked as having had a beacon present on it we queue the beacon hint processing into the workqueue. All wireless devices will benefit from beacon regulatory hints from any wireless device on a system including new devices connected to the system at a later time. Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
473 lines
15 KiB
C
473 lines
15 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 <linux/ieee80211.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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* @beacon_found: helper to regulatory code to indicate when a beacon
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* has been found on this channel. Use regulatory_hint_found_beacon()
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* to enable this, this is is useful only on 5 GHz band.
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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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bool beacon_found;
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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_sta_ht_cap - 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 the STA
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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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* @mcs: Supported MCS rates
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*/
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struct ieee80211_sta_ht_cap {
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u16 cap; /* use IEEE80211_HT_CAP_ */
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bool ht_supported;
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u8 ampdu_factor;
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u8 ampdu_density;
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struct ieee80211_mcs_info mcs;
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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_sta_ht_cap ht_cap;
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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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* @custom_regulatory: tells us the driver for this device
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* has its own custom regulatory domain and cannot identify the
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* ISO / IEC 3166 alpha2 it belongs to. When this is enabled
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* we will disregard the first regulatory hint (when the
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* initiator is %REGDOM_SET_BY_CORE).
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* @strict_regulatory: tells us the driver for this device will ignore
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* regulatory domain settings until it gets its own regulatory domain
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* via its regulatory_hint(). After its gets its own regulatory domain
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* it will only allow further regulatory domain settings to further
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* enhance compliance. For example if channel 13 and 14 are disabled
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* by this regulatory domain no user regulatory domain can enable these
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* channels at a later time. This can be used for devices which do not
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* have calibration information gauranteed for frequencies or settings
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* outside of its regulatory domain.
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* @reg_notifier: the driver's regulatory notification callback
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* @regd: the driver's regulatory domain, if one was requested via
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* the regulatory_hint() API. This can be used by the driver
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* on the reg_notifier() if it chooses to ignore future
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* regulatory domain changes caused by other drivers.
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* @signal_type: signal type reported in &struct cfg80211_bss.
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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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bool custom_regulatory;
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bool strict_regulatory;
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enum cfg80211_signal_type signal_type;
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int bss_priv_size;
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u8 max_scan_ssids;
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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,
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struct regulatory_request *request);
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/* fields below are read-only, assigned by cfg80211 */
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const struct ieee80211_regdomain *regd;
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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 const char *wiphy_name(struct wiphy *wiphy)
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{
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return dev_name(&wiphy->dev);
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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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* ieee80211_get_response_rate - get basic rate for a given rate
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*
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* @sband: the band to look for rates in
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* @basic_rates: bitmap of basic rates
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* @bitrate: the bitrate for which to find the basic rate
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*
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* This function returns the basic rate corresponding to a given
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* bitrate, that is the next lower bitrate contained in the basic
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* rate map, which is, for this function, given as a bitmap of
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* indices of rates in the band's bitrate table.
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*/
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struct ieee80211_rate *
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ieee80211_get_response_rate(struct ieee80211_supported_band *sband,
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u32 basic_rates, int bitrate);
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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 wireless device giving the hint (used only for reporting
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* conflicts)
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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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*
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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.
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*
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* The wiphy must have been registered to cfg80211 prior to this call.
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* For cfg80211 drivers this means you must first use wiphy_register(),
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* for mac80211 drivers you must first use ieee80211_register_hw().
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*
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* Drivers should check the return value, its possible you can get
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* an -ENOMEM.
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*/
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extern int regulatory_hint(struct wiphy *wiphy, const char *alpha2);
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/**
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* regulatory_hint_11d - hints a country IE as a regulatory domain
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* @wiphy: the wireless device giving the hint (used only for reporting
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* conflicts)
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* @country_ie: pointer to the country IE
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* @country_ie_len: length of the country IE
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*
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* We will intersect the rd with the what CRDA tells us should apply
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* for the alpha2 this country IE belongs to, this prevents APs from
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* sending us incorrect or outdated information against a country.
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*/
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extern void regulatory_hint_11d(struct wiphy *wiphy,
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u8 *country_ie,
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u8 country_ie_len);
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/**
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* wiphy_apply_custom_regulatory - apply a custom driver regulatory domain
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* @wiphy: the wireless device we want to process the regulatory domain on
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* @regd: the custom regulatory domain to use for this wiphy
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*
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* Drivers can sometimes have custom regulatory domains which do not apply
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* to a specific country. Drivers can use this to apply such custom regulatory
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* domains. This routine must be called prior to wiphy registration. The
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* custom regulatory domain will be trusted completely and as such previous
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* default channel settings will be disregarded. If no rule is found for a
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* channel on the regulatory domain the channel will be disabled.
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*/
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extern void wiphy_apply_custom_regulatory(
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struct wiphy *wiphy,
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const struct ieee80211_regdomain *regd);
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/**
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* freq_reg_info - get regulatory information for the given frequency
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* @wiphy: the wiphy for which we want to process this rule for
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* @center_freq: Frequency in KHz for which we want regulatory information for
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* @bandwidth: the bandwidth requirement you have in KHz, if you do not have one
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* you can set this to 0. If this frequency is allowed we then set
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* this value to the maximum allowed bandwidth.
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* @reg_rule: the regulatory rule which we have for this frequency
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*
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* Use this function to get the regulatory rule for a specific frequency on
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* a given wireless device. If the device has a specific regulatory domain
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* it wants to follow we respect that unless a country IE has been received
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* and processed already.
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*
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* Returns 0 if it was able to find a valid regulatory rule which does
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* apply to the given center_freq otherwise it returns non-zero. It will
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* also return -ERANGE if we determine the given center_freq does not even have
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* a regulatory rule for a frequency range in the center_freq's band. See
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* freq_in_rule_band() for our current definition of a band -- this is purely
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* subjective and right now its 802.11 specific.
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*/
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extern int freq_reg_info(struct wiphy *wiphy, u32 center_freq, u32 *bandwidth,
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const struct ieee80211_reg_rule **reg_rule);
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#endif /* __NET_WIRELESS_H */
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