585 lines
21 KiB
XML
585 lines
21 KiB
XML
<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE set PUBLIC "-//OASIS//DTD DocBook XML V4.1.2//EN"
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"http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd" []>
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<set>
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<setinfo>
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<title>The 802.11 subsystems – for kernel developers</title>
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<subtitle>
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Explaining wireless 802.11 networking in the Linux kernel
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</subtitle>
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<copyright>
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<year>2007-2009</year>
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<holder>Johannes Berg</holder>
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</copyright>
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<authorgroup>
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<author>
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<firstname>Johannes</firstname>
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<surname>Berg</surname>
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<affiliation>
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<address><email>johannes@sipsolutions.net</email></address>
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</affiliation>
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</author>
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</authorgroup>
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<legalnotice>
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<para>
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This documentation is free software; you can redistribute
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it and/or modify it under the terms of the GNU General Public
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License version 2 as published by the Free Software Foundation.
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</para>
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<para>
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This documentation is distributed in the hope that it will be
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useful, but WITHOUT ANY WARRANTY; without even the implied
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warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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See the GNU General Public License for more details.
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</para>
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<para>
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You should have received a copy of the GNU General Public
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License along with this documentation; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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MA 02111-1307 USA
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</para>
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<para>
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For more details see the file COPYING in the source
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distribution of Linux.
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</para>
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</legalnotice>
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<abstract>
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<para>
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These books attempt to give a description of the
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various subsystems that play a role in 802.11 wireless
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networking in Linux. Since these books are for kernel
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developers they attempts to document the structures
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and functions used in the kernel as well as giving a
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higher-level overview.
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</para>
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<para>
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The reader is expected to be familiar with the 802.11
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standard as published by the IEEE in 802.11-2007 (or
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possibly later versions). References to this standard
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will be given as "802.11-2007 8.1.5".
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</para>
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</abstract>
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</setinfo>
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<book id="cfg80211-developers-guide">
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<bookinfo>
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<title>The cfg80211 subsystem</title>
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<abstract>
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!Pinclude/net/cfg80211.h Introduction
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</abstract>
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</bookinfo>
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<chapter>
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<title>Device registration</title>
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!Pinclude/net/cfg80211.h Device registration
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!Finclude/net/cfg80211.h ieee80211_band
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!Finclude/net/cfg80211.h ieee80211_channel_flags
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!Finclude/net/cfg80211.h ieee80211_channel
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!Finclude/net/cfg80211.h ieee80211_rate_flags
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!Finclude/net/cfg80211.h ieee80211_rate
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!Finclude/net/cfg80211.h ieee80211_sta_ht_cap
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!Finclude/net/cfg80211.h ieee80211_supported_band
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!Finclude/net/cfg80211.h cfg80211_signal_type
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!Finclude/net/cfg80211.h wiphy_params_flags
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!Finclude/net/cfg80211.h wiphy_flags
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!Finclude/net/cfg80211.h wiphy
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!Finclude/net/cfg80211.h wireless_dev
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!Finclude/net/cfg80211.h wiphy_new
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!Finclude/net/cfg80211.h wiphy_register
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!Finclude/net/cfg80211.h wiphy_unregister
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!Finclude/net/cfg80211.h wiphy_free
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!Finclude/net/cfg80211.h wiphy_name
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!Finclude/net/cfg80211.h wiphy_dev
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!Finclude/net/cfg80211.h wiphy_priv
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!Finclude/net/cfg80211.h priv_to_wiphy
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!Finclude/net/cfg80211.h set_wiphy_dev
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!Finclude/net/cfg80211.h wdev_priv
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</chapter>
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<chapter>
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<title>Actions and configuration</title>
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!Pinclude/net/cfg80211.h Actions and configuration
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!Finclude/net/cfg80211.h cfg80211_ops
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!Finclude/net/cfg80211.h vif_params
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!Finclude/net/cfg80211.h key_params
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!Finclude/net/cfg80211.h survey_info_flags
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!Finclude/net/cfg80211.h survey_info
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!Finclude/net/cfg80211.h beacon_parameters
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!Finclude/net/cfg80211.h plink_actions
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!Finclude/net/cfg80211.h station_parameters
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!Finclude/net/cfg80211.h station_info_flags
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!Finclude/net/cfg80211.h rate_info_flags
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!Finclude/net/cfg80211.h rate_info
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!Finclude/net/cfg80211.h station_info
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!Finclude/net/cfg80211.h monitor_flags
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!Finclude/net/cfg80211.h mpath_info_flags
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!Finclude/net/cfg80211.h mpath_info
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!Finclude/net/cfg80211.h bss_parameters
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!Finclude/net/cfg80211.h ieee80211_txq_params
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!Finclude/net/cfg80211.h cfg80211_crypto_settings
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!Finclude/net/cfg80211.h cfg80211_auth_request
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!Finclude/net/cfg80211.h cfg80211_assoc_request
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!Finclude/net/cfg80211.h cfg80211_deauth_request
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!Finclude/net/cfg80211.h cfg80211_disassoc_request
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!Finclude/net/cfg80211.h cfg80211_ibss_params
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!Finclude/net/cfg80211.h cfg80211_connect_params
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!Finclude/net/cfg80211.h cfg80211_pmksa
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!Finclude/net/cfg80211.h cfg80211_send_rx_auth
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!Finclude/net/cfg80211.h cfg80211_send_auth_timeout
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!Finclude/net/cfg80211.h __cfg80211_auth_canceled
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!Finclude/net/cfg80211.h cfg80211_send_rx_assoc
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!Finclude/net/cfg80211.h cfg80211_send_assoc_timeout
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!Finclude/net/cfg80211.h cfg80211_send_deauth
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!Finclude/net/cfg80211.h __cfg80211_send_deauth
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!Finclude/net/cfg80211.h cfg80211_send_disassoc
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!Finclude/net/cfg80211.h __cfg80211_send_disassoc
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!Finclude/net/cfg80211.h cfg80211_ibss_joined
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!Finclude/net/cfg80211.h cfg80211_connect_result
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!Finclude/net/cfg80211.h cfg80211_roamed
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!Finclude/net/cfg80211.h cfg80211_disconnected
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!Finclude/net/cfg80211.h cfg80211_ready_on_channel
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!Finclude/net/cfg80211.h cfg80211_remain_on_channel_expired
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!Finclude/net/cfg80211.h cfg80211_new_sta
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!Finclude/net/cfg80211.h cfg80211_rx_mgmt
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!Finclude/net/cfg80211.h cfg80211_mgmt_tx_status
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!Finclude/net/cfg80211.h cfg80211_cqm_rssi_notify
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!Finclude/net/cfg80211.h cfg80211_cqm_pktloss_notify
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!Finclude/net/cfg80211.h cfg80211_michael_mic_failure
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</chapter>
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<chapter>
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<title>Scanning and BSS list handling</title>
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!Pinclude/net/cfg80211.h Scanning and BSS list handling
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!Finclude/net/cfg80211.h cfg80211_ssid
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!Finclude/net/cfg80211.h cfg80211_scan_request
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!Finclude/net/cfg80211.h cfg80211_scan_done
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!Finclude/net/cfg80211.h cfg80211_bss
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!Finclude/net/cfg80211.h cfg80211_inform_bss_frame
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!Finclude/net/cfg80211.h cfg80211_inform_bss
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!Finclude/net/cfg80211.h cfg80211_unlink_bss
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!Finclude/net/cfg80211.h cfg80211_find_ie
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!Finclude/net/cfg80211.h ieee80211_bss_get_ie
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</chapter>
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<chapter>
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<title>Utility functions</title>
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!Pinclude/net/cfg80211.h Utility functions
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!Finclude/net/cfg80211.h ieee80211_channel_to_frequency
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!Finclude/net/cfg80211.h ieee80211_frequency_to_channel
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!Finclude/net/cfg80211.h ieee80211_get_channel
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!Finclude/net/cfg80211.h ieee80211_get_response_rate
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!Finclude/net/cfg80211.h ieee80211_hdrlen
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!Finclude/net/cfg80211.h ieee80211_get_hdrlen_from_skb
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!Finclude/net/cfg80211.h ieee80211_radiotap_iterator
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</chapter>
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<chapter>
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<title>Data path helpers</title>
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!Pinclude/net/cfg80211.h Data path helpers
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!Finclude/net/cfg80211.h ieee80211_data_to_8023
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!Finclude/net/cfg80211.h ieee80211_data_from_8023
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!Finclude/net/cfg80211.h ieee80211_amsdu_to_8023s
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!Finclude/net/cfg80211.h cfg80211_classify8021d
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</chapter>
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<chapter>
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<title>Regulatory enforcement infrastructure</title>
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!Pinclude/net/cfg80211.h Regulatory enforcement infrastructure
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!Finclude/net/cfg80211.h regulatory_hint
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!Finclude/net/cfg80211.h wiphy_apply_custom_regulatory
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!Finclude/net/cfg80211.h freq_reg_info
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</chapter>
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<chapter>
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<title>RFkill integration</title>
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!Pinclude/net/cfg80211.h RFkill integration
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!Finclude/net/cfg80211.h wiphy_rfkill_set_hw_state
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!Finclude/net/cfg80211.h wiphy_rfkill_start_polling
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!Finclude/net/cfg80211.h wiphy_rfkill_stop_polling
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</chapter>
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<chapter>
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<title>Test mode</title>
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!Pinclude/net/cfg80211.h Test mode
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!Finclude/net/cfg80211.h cfg80211_testmode_alloc_reply_skb
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!Finclude/net/cfg80211.h cfg80211_testmode_reply
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!Finclude/net/cfg80211.h cfg80211_testmode_alloc_event_skb
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!Finclude/net/cfg80211.h cfg80211_testmode_event
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</chapter>
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</book>
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<book id="mac80211-developers-guide">
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<bookinfo>
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<title>The mac80211 subsystem</title>
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<abstract>
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!Pinclude/net/mac80211.h Introduction
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!Pinclude/net/mac80211.h Warning
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</abstract>
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</bookinfo>
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<toc></toc>
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<!--
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Generally, this document shall be ordered by increasing complexity.
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It is important to note that readers should be able to read only
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the first few sections to get a working driver and only advanced
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usage should require reading the full document.
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-->
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<part>
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<title>The basic mac80211 driver interface</title>
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<partintro>
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<para>
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You should read and understand the information contained
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within this part of the book while implementing a driver.
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In some chapters, advanced usage is noted, that may be
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skipped at first.
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</para>
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<para>
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This part of the book only covers station and monitor mode
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functionality, additional information required to implement
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the other modes is covered in the second part of the book.
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</para>
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</partintro>
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<chapter id="basics">
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<title>Basic hardware handling</title>
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<para>TBD</para>
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<para>
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This chapter shall contain information on getting a hw
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struct allocated and registered with mac80211.
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</para>
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<para>
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Since it is required to allocate rates/modes before registering
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a hw struct, this chapter shall also contain information on setting
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up the rate/mode structs.
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</para>
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<para>
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Additionally, some discussion about the callbacks and
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the general programming model should be in here, including
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the definition of ieee80211_ops which will be referred to
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a lot.
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</para>
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<para>
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Finally, a discussion of hardware capabilities should be done
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with references to other parts of the book.
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</para>
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<!-- intentionally multiple !F lines to get proper order -->
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!Finclude/net/mac80211.h ieee80211_hw
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!Finclude/net/mac80211.h ieee80211_hw_flags
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!Finclude/net/mac80211.h SET_IEEE80211_DEV
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!Finclude/net/mac80211.h SET_IEEE80211_PERM_ADDR
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!Finclude/net/mac80211.h ieee80211_ops
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!Finclude/net/mac80211.h ieee80211_alloc_hw
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!Finclude/net/mac80211.h ieee80211_register_hw
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!Finclude/net/mac80211.h ieee80211_unregister_hw
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!Finclude/net/mac80211.h ieee80211_free_hw
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</chapter>
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<chapter id="phy-handling">
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<title>PHY configuration</title>
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<para>TBD</para>
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<para>
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This chapter should describe PHY handling including
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start/stop callbacks and the various structures used.
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</para>
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!Finclude/net/mac80211.h ieee80211_conf
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!Finclude/net/mac80211.h ieee80211_conf_flags
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</chapter>
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<chapter id="iface-handling">
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<title>Virtual interfaces</title>
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<para>TBD</para>
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<para>
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This chapter should describe virtual interface basics
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that are relevant to the driver (VLANs, MGMT etc are not.)
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It should explain the use of the add_iface/remove_iface
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callbacks as well as the interface configuration callbacks.
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</para>
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<para>Things related to AP mode should be discussed there.</para>
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<para>
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Things related to supporting multiple interfaces should be
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in the appropriate chapter, a BIG FAT note should be here about
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this though and the recommendation to allow only a single
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interface in STA mode at first!
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</para>
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!Finclude/net/mac80211.h ieee80211_vif
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</chapter>
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<chapter id="rx-tx">
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<title>Receive and transmit processing</title>
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<sect1>
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<title>what should be here</title>
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<para>TBD</para>
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<para>
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This should describe the receive and transmit
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paths in mac80211/the drivers as well as
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transmit status handling.
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</para>
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</sect1>
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<sect1>
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<title>Frame format</title>
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!Pinclude/net/mac80211.h Frame format
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</sect1>
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<sect1>
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<title>Packet alignment</title>
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!Pnet/mac80211/rx.c Packet alignment
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</sect1>
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<sect1>
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<title>Calling into mac80211 from interrupts</title>
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!Pinclude/net/mac80211.h Calling mac80211 from interrupts
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</sect1>
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<sect1>
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<title>functions/definitions</title>
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!Finclude/net/mac80211.h ieee80211_rx_status
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!Finclude/net/mac80211.h mac80211_rx_flags
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!Finclude/net/mac80211.h mac80211_tx_control_flags
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!Finclude/net/mac80211.h mac80211_rate_control_flags
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!Finclude/net/mac80211.h ieee80211_tx_rate
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!Finclude/net/mac80211.h ieee80211_tx_info
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!Finclude/net/mac80211.h ieee80211_tx_info_clear_status
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!Finclude/net/mac80211.h ieee80211_rx
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!Finclude/net/mac80211.h ieee80211_rx_ni
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!Finclude/net/mac80211.h ieee80211_rx_irqsafe
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!Finclude/net/mac80211.h ieee80211_tx_status
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!Finclude/net/mac80211.h ieee80211_tx_status_ni
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!Finclude/net/mac80211.h ieee80211_tx_status_irqsafe
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!Finclude/net/mac80211.h ieee80211_rts_get
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!Finclude/net/mac80211.h ieee80211_rts_duration
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!Finclude/net/mac80211.h ieee80211_ctstoself_get
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!Finclude/net/mac80211.h ieee80211_ctstoself_duration
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!Finclude/net/mac80211.h ieee80211_generic_frame_duration
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!Finclude/net/mac80211.h ieee80211_wake_queue
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!Finclude/net/mac80211.h ieee80211_stop_queue
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!Finclude/net/mac80211.h ieee80211_wake_queues
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!Finclude/net/mac80211.h ieee80211_stop_queues
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!Finclude/net/mac80211.h ieee80211_queue_stopped
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</sect1>
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</chapter>
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<chapter id="filters">
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<title>Frame filtering</title>
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!Pinclude/net/mac80211.h Frame filtering
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!Finclude/net/mac80211.h ieee80211_filter_flags
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</chapter>
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<chapter id="workqueue">
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<title>The mac80211 workqueue</title>
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!Pinclude/net/mac80211.h mac80211 workqueue
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!Finclude/net/mac80211.h ieee80211_queue_work
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!Finclude/net/mac80211.h ieee80211_queue_delayed_work
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</chapter>
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</part>
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<part id="advanced">
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<title>Advanced driver interface</title>
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<partintro>
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<para>
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Information contained within this part of the book is
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of interest only for advanced interaction of mac80211
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with drivers to exploit more hardware capabilities and
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improve performance.
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</para>
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</partintro>
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<chapter id="led-support">
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<title>LED support</title>
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<para>
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Mac80211 supports various ways of blinking LEDs. Wherever possible,
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device LEDs should be exposed as LED class devices and hooked up to
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the appropriate trigger, which will then be triggered appropriately
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by mac80211.
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</para>
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!Finclude/net/mac80211.h ieee80211_get_tx_led_name
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!Finclude/net/mac80211.h ieee80211_get_rx_led_name
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!Finclude/net/mac80211.h ieee80211_get_assoc_led_name
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!Finclude/net/mac80211.h ieee80211_get_radio_led_name
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!Finclude/net/mac80211.h ieee80211_tpt_blink
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!Finclude/net/mac80211.h ieee80211_tpt_led_trigger_flags
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!Finclude/net/mac80211.h ieee80211_create_tpt_led_trigger
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</chapter>
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<chapter id="hardware-crypto-offload">
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<title>Hardware crypto acceleration</title>
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!Pinclude/net/mac80211.h Hardware crypto acceleration
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<!-- intentionally multiple !F lines to get proper order -->
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!Finclude/net/mac80211.h set_key_cmd
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!Finclude/net/mac80211.h ieee80211_key_conf
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!Finclude/net/mac80211.h ieee80211_key_flags
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!Finclude/net/mac80211.h ieee80211_get_tkip_p1k
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!Finclude/net/mac80211.h ieee80211_get_tkip_p1k_iv
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!Finclude/net/mac80211.h ieee80211_get_tkip_p2k
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!Finclude/net/mac80211.h ieee80211_key_removed
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</chapter>
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<chapter id="powersave">
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<title>Powersave support</title>
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!Pinclude/net/mac80211.h Powersave support
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</chapter>
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<chapter id="beacon-filter">
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<title>Beacon filter support</title>
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!Pinclude/net/mac80211.h Beacon filter support
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!Finclude/net/mac80211.h ieee80211_beacon_loss
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</chapter>
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<chapter id="qos">
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<title>Multiple queues and QoS support</title>
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<para>TBD</para>
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!Finclude/net/mac80211.h ieee80211_tx_queue_params
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</chapter>
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<chapter id="AP">
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<title>Access point mode support</title>
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<para>TBD</para>
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<para>Some parts of the if_conf should be discussed here instead</para>
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<para>
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Insert notes about VLAN interfaces with hw crypto here or
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in the hw crypto chapter.
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</para>
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<section id="ps-client">
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<title>support for powersaving clients</title>
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!Pinclude/net/mac80211.h AP support for powersaving clients
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</section>
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!Finclude/net/mac80211.h ieee80211_get_buffered_bc
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!Finclude/net/mac80211.h ieee80211_beacon_get
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!Finclude/net/mac80211.h ieee80211_sta_eosp_irqsafe
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!Finclude/net/mac80211.h ieee80211_frame_release_type
|
|
!Finclude/net/mac80211.h ieee80211_sta_ps_transition
|
|
!Finclude/net/mac80211.h ieee80211_sta_ps_transition_ni
|
|
!Finclude/net/mac80211.h ieee80211_sta_set_buffered
|
|
!Finclude/net/mac80211.h ieee80211_sta_block_awake
|
|
</chapter>
|
|
|
|
<chapter id="multi-iface">
|
|
<title>Supporting multiple virtual interfaces</title>
|
|
<para>TBD</para>
|
|
<para>
|
|
Note: WDS with identical MAC address should almost always be OK
|
|
</para>
|
|
<para>
|
|
Insert notes about having multiple virtual interfaces with
|
|
different MAC addresses here, note which configurations are
|
|
supported by mac80211, add notes about supporting hw crypto
|
|
with it.
|
|
</para>
|
|
!Finclude/net/mac80211.h ieee80211_iterate_active_interfaces
|
|
!Finclude/net/mac80211.h ieee80211_iterate_active_interfaces_atomic
|
|
</chapter>
|
|
|
|
<chapter id="station-handling">
|
|
<title>Station handling</title>
|
|
<para>TODO</para>
|
|
!Finclude/net/mac80211.h ieee80211_sta
|
|
!Finclude/net/mac80211.h sta_notify_cmd
|
|
!Finclude/net/mac80211.h ieee80211_find_sta
|
|
!Finclude/net/mac80211.h ieee80211_find_sta_by_ifaddr
|
|
</chapter>
|
|
|
|
<chapter id="hardware-scan-offload">
|
|
<title>Hardware scan offload</title>
|
|
<para>TBD</para>
|
|
!Finclude/net/mac80211.h ieee80211_scan_completed
|
|
</chapter>
|
|
|
|
<chapter id="aggregation">
|
|
<title>Aggregation</title>
|
|
<sect1>
|
|
<title>TX A-MPDU aggregation</title>
|
|
!Pnet/mac80211/agg-tx.c TX A-MPDU aggregation
|
|
!Cnet/mac80211/agg-tx.c
|
|
</sect1>
|
|
<sect1>
|
|
<title>RX A-MPDU aggregation</title>
|
|
!Pnet/mac80211/agg-rx.c RX A-MPDU aggregation
|
|
!Cnet/mac80211/agg-rx.c
|
|
</sect1>
|
|
!Finclude/net/mac80211.h ieee80211_ampdu_mlme_action
|
|
</chapter>
|
|
|
|
<chapter id="smps">
|
|
<title>Spatial Multiplexing Powersave (SMPS)</title>
|
|
!Pinclude/net/mac80211.h Spatial multiplexing power save
|
|
!Finclude/net/mac80211.h ieee80211_request_smps
|
|
!Finclude/net/mac80211.h ieee80211_smps_mode
|
|
</chapter>
|
|
</part>
|
|
|
|
<part id="rate-control">
|
|
<title>Rate control interface</title>
|
|
<partintro>
|
|
<para>TBD</para>
|
|
<para>
|
|
This part of the book describes the rate control algorithm
|
|
interface and how it relates to mac80211 and drivers.
|
|
</para>
|
|
</partintro>
|
|
<chapter id="ratecontrol-api">
|
|
<title>Rate Control API</title>
|
|
<para>TBD</para>
|
|
!Finclude/net/mac80211.h ieee80211_start_tx_ba_session
|
|
!Finclude/net/mac80211.h ieee80211_start_tx_ba_cb_irqsafe
|
|
!Finclude/net/mac80211.h ieee80211_stop_tx_ba_session
|
|
!Finclude/net/mac80211.h ieee80211_stop_tx_ba_cb_irqsafe
|
|
!Finclude/net/mac80211.h rate_control_changed
|
|
!Finclude/net/mac80211.h ieee80211_tx_rate_control
|
|
!Finclude/net/mac80211.h rate_control_send_low
|
|
</chapter>
|
|
</part>
|
|
|
|
<part id="internal">
|
|
<title>Internals</title>
|
|
<partintro>
|
|
<para>TBD</para>
|
|
<para>
|
|
This part of the book describes mac80211 internals.
|
|
</para>
|
|
</partintro>
|
|
|
|
<chapter id="key-handling">
|
|
<title>Key handling</title>
|
|
<sect1>
|
|
<title>Key handling basics</title>
|
|
!Pnet/mac80211/key.c Key handling basics
|
|
</sect1>
|
|
<sect1>
|
|
<title>MORE TBD</title>
|
|
<para>TBD</para>
|
|
</sect1>
|
|
</chapter>
|
|
|
|
<chapter id="rx-processing">
|
|
<title>Receive processing</title>
|
|
<para>TBD</para>
|
|
</chapter>
|
|
|
|
<chapter id="tx-processing">
|
|
<title>Transmit processing</title>
|
|
<para>TBD</para>
|
|
</chapter>
|
|
|
|
<chapter id="sta-info">
|
|
<title>Station info handling</title>
|
|
<sect1>
|
|
<title>Programming information</title>
|
|
!Fnet/mac80211/sta_info.h sta_info
|
|
!Fnet/mac80211/sta_info.h ieee80211_sta_info_flags
|
|
</sect1>
|
|
<sect1>
|
|
<title>STA information lifetime rules</title>
|
|
!Pnet/mac80211/sta_info.c STA information lifetime rules
|
|
</sect1>
|
|
</chapter>
|
|
|
|
<chapter id="aggregation-internals">
|
|
<title>Aggregation</title>
|
|
!Fnet/mac80211/sta_info.h sta_ampdu_mlme
|
|
!Fnet/mac80211/sta_info.h tid_ampdu_tx
|
|
!Fnet/mac80211/sta_info.h tid_ampdu_rx
|
|
</chapter>
|
|
|
|
<chapter id="synchronisation">
|
|
<title>Synchronisation</title>
|
|
<para>TBD</para>
|
|
<para>Locking, lots of RCU</para>
|
|
</chapter>
|
|
</part>
|
|
</book>
|
|
</set>
|