util.c 49.8 KB
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/*
 * Copyright 2002-2005, Instant802 Networks, Inc.
 * Copyright 2005-2006, Devicescape Software, Inc.
 * Copyright 2006-2007	Jiri Benc <jbenc@suse.cz>
 * Copyright 2007	Johannes Berg <johannes@sipsolutions.net>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * utilities for mac80211
 */

#include <net/mac80211.h>
#include <linux/netdevice.h>
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#include <linux/export.h>
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#include <linux/types.h>
#include <linux/slab.h>
#include <linux/skbuff.h>
#include <linux/etherdevice.h>
#include <linux/if_arp.h>
#include <linux/bitmap.h>
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#include <linux/crc32.h>
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#include <net/net_namespace.h>
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#include <net/cfg80211.h>
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#include <net/rtnetlink.h>
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#include "ieee80211_i.h"
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#include "driver-ops.h"
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#include "rate.h"
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#include "mesh.h"
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#include "wme.h"
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#include "led.h"
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#include "wep.h"
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/* privid for wiphys to determine whether they belong to us or not */
void *mac80211_wiphy_privid = &mac80211_wiphy_privid;

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struct ieee80211_hw *wiphy_to_ieee80211_hw(struct wiphy *wiphy)
{
	struct ieee80211_local *local;
	BUG_ON(!wiphy);

	local = wiphy_priv(wiphy);
	return &local->hw;
}
EXPORT_SYMBOL(wiphy_to_ieee80211_hw);
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u8 *ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len,
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			enum nl80211_iftype type)
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{
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	__le16 fc = hdr->frame_control;
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	 /* drop ACK/CTS frames and incorrect hdr len (ctrl) */
	if (len < 16)
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		return NULL;

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	if (ieee80211_is_data(fc)) {
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		if (len < 24) /* drop incorrect hdr len (data) */
			return NULL;
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		if (ieee80211_has_a4(fc))
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			return NULL;
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		if (ieee80211_has_tods(fc))
			return hdr->addr1;
		if (ieee80211_has_fromds(fc))
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			return hdr->addr2;
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		return hdr->addr3;
	}

	if (ieee80211_is_mgmt(fc)) {
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		if (len < 24) /* drop incorrect hdr len (mgmt) */
			return NULL;
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		return hdr->addr3;
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	}

	if (ieee80211_is_ctl(fc)) {
		if(ieee80211_is_pspoll(fc))
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			return hdr->addr1;
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		if (ieee80211_is_back_req(fc)) {
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			switch (type) {
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			case NL80211_IFTYPE_STATION:
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				return hdr->addr2;
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			case NL80211_IFTYPE_AP:
			case NL80211_IFTYPE_AP_VLAN:
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				return hdr->addr1;
			default:
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				break; /* fall through to the return */
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			}
		}
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	}

	return NULL;
}

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void ieee80211_tx_set_protected(struct ieee80211_tx_data *tx)
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{
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	struct sk_buff *skb;
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	struct ieee80211_hdr *hdr;

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	skb_queue_walk(&tx->skbs, skb) {
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		hdr = (struct ieee80211_hdr *) skb->data;
		hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
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	}
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}

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int ieee80211_frame_duration(enum ieee80211_band band, size_t len,
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			     int rate, int erp, int short_preamble)
{
	int dur;

	/* calculate duration (in microseconds, rounded up to next higher
	 * integer if it includes a fractional microsecond) to send frame of
	 * len bytes (does not include FCS) at the given rate. Duration will
	 * also include SIFS.
	 *
	 * rate is in 100 kbps, so divident is multiplied by 10 in the
	 * DIV_ROUND_UP() operations.
	 */

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	if (band == IEEE80211_BAND_5GHZ || erp) {
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		/*
		 * OFDM:
		 *
		 * N_DBPS = DATARATE x 4
		 * N_SYM = Ceiling((16+8xLENGTH+6) / N_DBPS)
		 *	(16 = SIGNAL time, 6 = tail bits)
		 * TXTIME = T_PREAMBLE + T_SIGNAL + T_SYM x N_SYM + Signal Ext
		 *
		 * T_SYM = 4 usec
		 * 802.11a - 17.5.2: aSIFSTime = 16 usec
		 * 802.11g - 19.8.4: aSIFSTime = 10 usec +
		 *	signal ext = 6 usec
		 */
		dur = 16; /* SIFS + signal ext */
		dur += 16; /* 17.3.2.3: T_PREAMBLE = 16 usec */
		dur += 4; /* 17.3.2.3: T_SIGNAL = 4 usec */
		dur += 4 * DIV_ROUND_UP((16 + 8 * (len + 4) + 6) * 10,
					4 * rate); /* T_SYM x N_SYM */
	} else {
		/*
		 * 802.11b or 802.11g with 802.11b compatibility:
		 * 18.3.4: TXTIME = PreambleLength + PLCPHeaderTime +
		 * Ceiling(((LENGTH+PBCC)x8)/DATARATE). PBCC=0.
		 *
		 * 802.11 (DS): 15.3.3, 802.11b: 18.3.4
		 * aSIFSTime = 10 usec
		 * aPreambleLength = 144 usec or 72 usec with short preamble
		 * aPLCPHeaderLength = 48 usec or 24 usec with short preamble
		 */
		dur = 10; /* aSIFSTime = 10 usec */
		dur += short_preamble ? (72 + 24) : (144 + 48);

		dur += DIV_ROUND_UP(8 * (len + 4) * 10, rate);
	}

	return dur;
}

/* Exported duration function for driver use */
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__le16 ieee80211_generic_frame_duration(struct ieee80211_hw *hw,
					struct ieee80211_vif *vif,
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					enum ieee80211_band band,
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					size_t frame_len,
					struct ieee80211_rate *rate)
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{
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	struct ieee80211_sub_if_data *sdata;
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	u16 dur;
	int erp;
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	bool short_preamble = false;
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	erp = 0;
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	if (vif) {
		sdata = vif_to_sdata(vif);
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		short_preamble = sdata->vif.bss_conf.use_short_preamble;
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		if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
			erp = rate->flags & IEEE80211_RATE_ERP_G;
	}
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	dur = ieee80211_frame_duration(band, frame_len, rate->bitrate, erp,
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				       short_preamble);
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	return cpu_to_le16(dur);
}
EXPORT_SYMBOL(ieee80211_generic_frame_duration);

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__le16 ieee80211_rts_duration(struct ieee80211_hw *hw,
			      struct ieee80211_vif *vif, size_t frame_len,
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			      const struct ieee80211_tx_info *frame_txctl)
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{
	struct ieee80211_local *local = hw_to_local(hw);
	struct ieee80211_rate *rate;
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	struct ieee80211_sub_if_data *sdata;
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	bool short_preamble;
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	int erp;
	u16 dur;
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	struct ieee80211_supported_band *sband;

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	sband = local->hw.wiphy->bands[frame_txctl->band];
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	short_preamble = false;
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	rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
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	erp = 0;
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	if (vif) {
		sdata = vif_to_sdata(vif);
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		short_preamble = sdata->vif.bss_conf.use_short_preamble;
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		if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
			erp = rate->flags & IEEE80211_RATE_ERP_G;
	}
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	/* CTS duration */
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	dur = ieee80211_frame_duration(sband->band, 10, rate->bitrate,
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				       erp, short_preamble);
	/* Data frame duration */
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	dur += ieee80211_frame_duration(sband->band, frame_len, rate->bitrate,
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					erp, short_preamble);
	/* ACK duration */
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	dur += ieee80211_frame_duration(sband->band, 10, rate->bitrate,
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					erp, short_preamble);

	return cpu_to_le16(dur);
}
EXPORT_SYMBOL(ieee80211_rts_duration);

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__le16 ieee80211_ctstoself_duration(struct ieee80211_hw *hw,
				    struct ieee80211_vif *vif,
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				    size_t frame_len,
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				    const struct ieee80211_tx_info *frame_txctl)
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{
	struct ieee80211_local *local = hw_to_local(hw);
	struct ieee80211_rate *rate;
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	struct ieee80211_sub_if_data *sdata;
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	bool short_preamble;
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	int erp;
	u16 dur;
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	struct ieee80211_supported_band *sband;

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	sband = local->hw.wiphy->bands[frame_txctl->band];
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	short_preamble = false;
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	rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
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	erp = 0;
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	if (vif) {
		sdata = vif_to_sdata(vif);
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		short_preamble = sdata->vif.bss_conf.use_short_preamble;
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		if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
			erp = rate->flags & IEEE80211_RATE_ERP_G;
	}
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	/* Data frame duration */
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	dur = ieee80211_frame_duration(sband->band, frame_len, rate->bitrate,
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				       erp, short_preamble);
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	if (!(frame_txctl->flags & IEEE80211_TX_CTL_NO_ACK)) {
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		/* ACK duration */
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		dur += ieee80211_frame_duration(sband->band, 10, rate->bitrate,
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						erp, short_preamble);
	}

	return cpu_to_le16(dur);
}
EXPORT_SYMBOL(ieee80211_ctstoself_duration);

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void ieee80211_propagate_queue_wake(struct ieee80211_local *local, int queue)
{
	struct ieee80211_sub_if_data *sdata;
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	int n_acs = IEEE80211_NUM_ACS;

	if (local->hw.queues < IEEE80211_NUM_ACS)
		n_acs = 1;
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	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
		int ac;

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		if (!sdata->dev)
			continue;

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		if (test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))
			continue;

		if (sdata->vif.cab_queue != IEEE80211_INVAL_HW_QUEUE &&
		    local->queue_stop_reasons[sdata->vif.cab_queue] != 0)
			continue;

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		for (ac = 0; ac < n_acs; ac++) {
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			int ac_queue = sdata->vif.hw_queue[ac];

			if (ac_queue == queue ||
			    (sdata->vif.cab_queue == queue &&
			     local->queue_stop_reasons[ac_queue] == 0 &&
			     skb_queue_empty(&local->pending[ac_queue])))
				netif_wake_subqueue(sdata->dev, ac);
		}
	}
}

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static void __ieee80211_wake_queue(struct ieee80211_hw *hw, int queue,
				   enum queue_stop_reason reason)
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{
	struct ieee80211_local *local = hw_to_local(hw);

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	trace_wake_queue(local, queue, reason);

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	if (WARN_ON(queue >= hw->queues))
		return;
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	if (!test_bit(reason, &local->queue_stop_reasons[queue]))
		return;

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	__clear_bit(reason, &local->queue_stop_reasons[queue]);

	if (local->queue_stop_reasons[queue] != 0)
		/* someone still has this queue stopped */
		return;

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	if (skb_queue_empty(&local->pending[queue])) {
		rcu_read_lock();
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		ieee80211_propagate_queue_wake(local, queue);
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		rcu_read_unlock();
	} else
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		tasklet_schedule(&local->tx_pending_tasklet);
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}
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void ieee80211_wake_queue_by_reason(struct ieee80211_hw *hw, int queue,
				    enum queue_stop_reason reason)
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{
	struct ieee80211_local *local = hw_to_local(hw);
	unsigned long flags;

	spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
	__ieee80211_wake_queue(hw, queue, reason);
	spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
}

void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue)
{
	ieee80211_wake_queue_by_reason(hw, queue,
				       IEEE80211_QUEUE_STOP_REASON_DRIVER);
}
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EXPORT_SYMBOL(ieee80211_wake_queue);

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static void __ieee80211_stop_queue(struct ieee80211_hw *hw, int queue,
				   enum queue_stop_reason reason)
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{
	struct ieee80211_local *local = hw_to_local(hw);
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	struct ieee80211_sub_if_data *sdata;
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	int n_acs = IEEE80211_NUM_ACS;
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	trace_stop_queue(local, queue, reason);

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	if (WARN_ON(queue >= hw->queues))
		return;
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	if (test_bit(reason, &local->queue_stop_reasons[queue]))
		return;

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	__set_bit(reason, &local->queue_stop_reasons[queue]);
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	if (local->hw.queues < IEEE80211_NUM_ACS)
		n_acs = 1;

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	rcu_read_lock();
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	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
		int ac;

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		if (!sdata->dev)
			continue;

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		for (ac = 0; ac < n_acs; ac++) {
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			if (sdata->vif.hw_queue[ac] == queue ||
			    sdata->vif.cab_queue == queue)
				netif_stop_subqueue(sdata->dev, ac);
		}
	}
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	rcu_read_unlock();
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}
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void ieee80211_stop_queue_by_reason(struct ieee80211_hw *hw, int queue,
				    enum queue_stop_reason reason)
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{
	struct ieee80211_local *local = hw_to_local(hw);
	unsigned long flags;

	spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
	__ieee80211_stop_queue(hw, queue, reason);
	spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
}

void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue)
{
	ieee80211_stop_queue_by_reason(hw, queue,
				       IEEE80211_QUEUE_STOP_REASON_DRIVER);
}
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EXPORT_SYMBOL(ieee80211_stop_queue);

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void ieee80211_add_pending_skb(struct ieee80211_local *local,
			       struct sk_buff *skb)
{
	struct ieee80211_hw *hw = &local->hw;
	unsigned long flags;
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	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
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	int queue = info->hw_queue;
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	if (WARN_ON(!info->control.vif)) {
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		ieee80211_free_txskb(&local->hw, skb);
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		return;
	}
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	spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
	__ieee80211_stop_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
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	__skb_queue_tail(&local->pending[queue], skb);
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	__ieee80211_wake_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
	spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
}

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void ieee80211_add_pending_skbs_fn(struct ieee80211_local *local,
				   struct sk_buff_head *skbs,
				   void (*fn)(void *data), void *data)
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{
	struct ieee80211_hw *hw = &local->hw;
	struct sk_buff *skb;
	unsigned long flags;
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	int queue, i;
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	spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
	while ((skb = skb_dequeue(skbs))) {
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		struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);

		if (WARN_ON(!info->control.vif)) {
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			ieee80211_free_txskb(&local->hw, skb);
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			continue;
		}

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		queue = info->hw_queue;
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		__ieee80211_stop_queue(hw, queue,
				IEEE80211_QUEUE_STOP_REASON_SKB_ADD);

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		__skb_queue_tail(&local->pending[queue], skb);
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	}

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	if (fn)
		fn(data);

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	for (i = 0; i < hw->queues; i++)
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		__ieee80211_wake_queue(hw, i,
			IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
	spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
}

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void ieee80211_stop_queues_by_reason(struct ieee80211_hw *hw,
				    enum queue_stop_reason reason)
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{
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	struct ieee80211_local *local = hw_to_local(hw);
	unsigned long flags;
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	int i;

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	spin_lock_irqsave(&local->queue_stop_reason_lock, flags);

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	for (i = 0; i < hw->queues; i++)
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		__ieee80211_stop_queue(hw, i, reason);

	spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
}

void ieee80211_stop_queues(struct ieee80211_hw *hw)
{
	ieee80211_stop_queues_by_reason(hw,
					IEEE80211_QUEUE_STOP_REASON_DRIVER);
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}
EXPORT_SYMBOL(ieee80211_stop_queues);

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int ieee80211_queue_stopped(struct ieee80211_hw *hw, int queue)
{
	struct ieee80211_local *local = hw_to_local(hw);
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	unsigned long flags;
	int ret;
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	if (WARN_ON(queue >= hw->queues))
		return true;
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	spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
	ret = !!local->queue_stop_reasons[queue];
	spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
	return ret;
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}
EXPORT_SYMBOL(ieee80211_queue_stopped);

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void ieee80211_wake_queues_by_reason(struct ieee80211_hw *hw,
				     enum queue_stop_reason reason)
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{
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	struct ieee80211_local *local = hw_to_local(hw);
	unsigned long flags;
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	int i;

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	spin_lock_irqsave(&local->queue_stop_reason_lock, flags);

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	for (i = 0; i < hw->queues; i++)
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		__ieee80211_wake_queue(hw, i, reason);

	spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
}

void ieee80211_wake_queues(struct ieee80211_hw *hw)
{
	ieee80211_wake_queues_by_reason(hw, IEEE80211_QUEUE_STOP_REASON_DRIVER);
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}
EXPORT_SYMBOL(ieee80211_wake_queues);
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void ieee80211_iterate_active_interfaces(
	struct ieee80211_hw *hw,
	void (*iterator)(void *data, u8 *mac,
			 struct ieee80211_vif *vif),
	void *data)
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{
	struct ieee80211_local *local = hw_to_local(hw);
	struct ieee80211_sub_if_data *sdata;

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	mutex_lock(&local->iflist_mtx);
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	list_for_each_entry(sdata, &local->interfaces, list) {
		switch (sdata->vif.type) {
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		case NL80211_IFTYPE_MONITOR:
		case NL80211_IFTYPE_AP_VLAN:
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			continue;
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		default:
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			break;
		}
533
		if (ieee80211_sdata_running(sdata))
534
			iterator(data, sdata->vif.addr,
535 536 537
				 &sdata->vif);
	}

538 539 540 541 542
	sdata = rcu_dereference_protected(local->monitor_sdata,
					  lockdep_is_held(&local->iflist_mtx));
	if (sdata)
		iterator(data, sdata->vif.addr, &sdata->vif);

543
	mutex_unlock(&local->iflist_mtx);
544 545 546 547 548 549 550 551 552 553 554 555
}
EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces);

void ieee80211_iterate_active_interfaces_atomic(
	struct ieee80211_hw *hw,
	void (*iterator)(void *data, u8 *mac,
			 struct ieee80211_vif *vif),
	void *data)
{
	struct ieee80211_local *local = hw_to_local(hw);
	struct ieee80211_sub_if_data *sdata;

556
	rcu_read_lock();
557

558
	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
559
		switch (sdata->vif.type) {
560 561
		case NL80211_IFTYPE_MONITOR:
		case NL80211_IFTYPE_AP_VLAN:
562
			continue;
563
		default:
564 565
			break;
		}
566
		if (ieee80211_sdata_running(sdata))
567
			iterator(data, sdata->vif.addr,
568
				 &sdata->vif);
569
	}
570

571 572 573 574
	sdata = rcu_dereference(local->monitor_sdata);
	if (sdata)
		iterator(data, sdata->vif.addr, &sdata->vif);

575
	rcu_read_unlock();
576
}
577
EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic);
578

579 580 581 582 583 584 585 586 587
/*
 * Nothing should have been stuffed into the workqueue during
 * the suspend->resume cycle. If this WARN is seen then there
 * is a bug with either the driver suspend or something in
 * mac80211 stuffing into the workqueue which we haven't yet
 * cleared during mac80211's suspend cycle.
 */
static bool ieee80211_can_queue_work(struct ieee80211_local *local)
{
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	if (WARN(local->suspended && !local->resuming,
		 "queueing ieee80211 work while going to suspend\n"))
		return false;
591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618

	return true;
}

void ieee80211_queue_work(struct ieee80211_hw *hw, struct work_struct *work)
{
	struct ieee80211_local *local = hw_to_local(hw);

	if (!ieee80211_can_queue_work(local))
		return;

	queue_work(local->workqueue, work);
}
EXPORT_SYMBOL(ieee80211_queue_work);

void ieee80211_queue_delayed_work(struct ieee80211_hw *hw,
				  struct delayed_work *dwork,
				  unsigned long delay)
{
	struct ieee80211_local *local = hw_to_local(hw);

	if (!ieee80211_can_queue_work(local))
		return;

	queue_delayed_work(local->workqueue, dwork, delay);
}
EXPORT_SYMBOL(ieee80211_queue_delayed_work);

619 620 621 622 623 624 625
u32 ieee802_11_parse_elems_crc(u8 *start, size_t len,
			       struct ieee802_11_elems *elems,
			       u64 filter, u32 crc)
{
	size_t left = len;
	u8 *pos = start;
	bool calc_crc = filter != 0;
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	DECLARE_BITMAP(seen_elems, 256);
627

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	bitmap_zero(seen_elems, 256);
629 630 631 632 633 634
	memset(elems, 0, sizeof(*elems));
	elems->ie_start = start;
	elems->total_len = len;

	while (left >= 2) {
		u8 id, elen;
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		bool elem_parse_failed;
636 637 638 639 640

		id = *pos++;
		elen = *pos++;
		left -= 2;

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		if (elen > left) {
			elems->parse_error = true;
643
			break;
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		}

646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680
		switch (id) {
		case WLAN_EID_SSID:
		case WLAN_EID_SUPP_RATES:
		case WLAN_EID_FH_PARAMS:
		case WLAN_EID_DS_PARAMS:
		case WLAN_EID_CF_PARAMS:
		case WLAN_EID_TIM:
		case WLAN_EID_IBSS_PARAMS:
		case WLAN_EID_CHALLENGE:
		case WLAN_EID_RSN:
		case WLAN_EID_ERP_INFO:
		case WLAN_EID_EXT_SUPP_RATES:
		case WLAN_EID_HT_CAPABILITY:
		case WLAN_EID_HT_OPERATION:
		case WLAN_EID_VHT_CAPABILITY:
		case WLAN_EID_VHT_OPERATION:
		case WLAN_EID_MESH_ID:
		case WLAN_EID_MESH_CONFIG:
		case WLAN_EID_PEER_MGMT:
		case WLAN_EID_PREQ:
		case WLAN_EID_PREP:
		case WLAN_EID_PERR:
		case WLAN_EID_RANN:
		case WLAN_EID_CHANNEL_SWITCH:
		case WLAN_EID_EXT_CHANSWITCH_ANN:
		case WLAN_EID_COUNTRY:
		case WLAN_EID_PWR_CONSTRAINT:
		case WLAN_EID_TIMEOUT_INTERVAL:
			if (test_bit(id, seen_elems)) {
				elems->parse_error = true;
				left -= elen;
				pos += elen;
				continue;
			}
			break;
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		}
682 683 684 685

		if (calc_crc && id < 64 && (filter & (1ULL << id)))
			crc = crc32_be(crc, pos - 2, elen + 2);

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		elem_parse_failed = false;

688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712
		switch (id) {
		case WLAN_EID_SSID:
			elems->ssid = pos;
			elems->ssid_len = elen;
			break;
		case WLAN_EID_SUPP_RATES:
			elems->supp_rates = pos;
			elems->supp_rates_len = elen;
			break;
		case WLAN_EID_FH_PARAMS:
			elems->fh_params = pos;
			elems->fh_params_len = elen;
			break;
		case WLAN_EID_DS_PARAMS:
			elems->ds_params = pos;
			elems->ds_params_len = elen;
			break;
		case WLAN_EID_CF_PARAMS:
			elems->cf_params = pos;
			elems->cf_params_len = elen;
			break;
		case WLAN_EID_TIM:
			if (elen >= sizeof(struct ieee80211_tim_ie)) {
				elems->tim = (void *)pos;
				elems->tim_len = elen;
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			} else
				elem_parse_failed = true;
715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762
			break;
		case WLAN_EID_IBSS_PARAMS:
			elems->ibss_params = pos;
			elems->ibss_params_len = elen;
			break;
		case WLAN_EID_CHALLENGE:
			elems->challenge = pos;
			elems->challenge_len = elen;
			break;
		case WLAN_EID_VENDOR_SPECIFIC:
			if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
			    pos[2] == 0xf2) {
				/* Microsoft OUI (00:50:F2) */

				if (calc_crc)
					crc = crc32_be(crc, pos - 2, elen + 2);

				if (pos[3] == 1) {
					/* OUI Type 1 - WPA IE */
					elems->wpa = pos;
					elems->wpa_len = elen;
				} else if (elen >= 5 && pos[3] == 2) {
					/* OUI Type 2 - WMM IE */
					if (pos[4] == 0) {
						elems->wmm_info = pos;
						elems->wmm_info_len = elen;
					} else if (pos[4] == 1) {
						elems->wmm_param = pos;
						elems->wmm_param_len = elen;
					}
				}
			}
			break;
		case WLAN_EID_RSN:
			elems->rsn = pos;
			elems->rsn_len = elen;
			break;
		case WLAN_EID_ERP_INFO:
			elems->erp_info = pos;
			elems->erp_info_len = elen;
			break;
		case WLAN_EID_EXT_SUPP_RATES:
			elems->ext_supp_rates = pos;
			elems->ext_supp_rates_len = elen;
			break;
		case WLAN_EID_HT_CAPABILITY:
			if (elen >= sizeof(struct ieee80211_ht_cap))
				elems->ht_cap_elem = (void *)pos;
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			else
				elem_parse_failed = true;
765
			break;
766 767 768
		case WLAN_EID_HT_OPERATION:
			if (elen >= sizeof(struct ieee80211_ht_operation))
				elems->ht_operation = (void *)pos;
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			else
				elem_parse_failed = true;
771
			break;
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		case WLAN_EID_VHT_CAPABILITY:
			if (elen >= sizeof(struct ieee80211_vht_cap))
				elems->vht_cap_elem = (void *)pos;
			else
				elem_parse_failed = true;
			break;
		case WLAN_EID_VHT_OPERATION:
			if (elen >= sizeof(struct ieee80211_vht_operation))
				elems->vht_operation = (void *)pos;
			else
				elem_parse_failed = true;
			break;
784 785 786 787 788 789 790
		case WLAN_EID_MESH_ID:
			elems->mesh_id = pos;
			elems->mesh_id_len = elen;
			break;
		case WLAN_EID_MESH_CONFIG:
			if (elen >= sizeof(struct ieee80211_meshconf_ie))
				elems->mesh_config = (void *)pos;
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			else
				elem_parse_failed = true;
793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812
			break;
		case WLAN_EID_PEER_MGMT:
			elems->peering = pos;
			elems->peering_len = elen;
			break;
		case WLAN_EID_PREQ:
			elems->preq = pos;
			elems->preq_len = elen;
			break;
		case WLAN_EID_PREP:
			elems->prep = pos;
			elems->prep_len = elen;
			break;
		case WLAN_EID_PERR:
			elems->perr = pos;
			elems->perr_len = elen;
			break;
		case WLAN_EID_RANN:
			if (elen >= sizeof(struct ieee80211_rann_ie))
				elems->rann = (void *)pos;
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			else
				elem_parse_failed = true;
815 816
			break;
		case WLAN_EID_CHANNEL_SWITCH:
817 818 819 820 821
			if (elen != sizeof(struct ieee80211_channel_sw_ie)) {
				elem_parse_failed = true;
				break;
			}
			elems->ch_switch_ie = (void *)pos;
822 823 824 825 826 827 828 829 830 831 832 833 834
			break;
		case WLAN_EID_QUIET:
			if (!elems->quiet_elem) {
				elems->quiet_elem = pos;
				elems->quiet_elem_len = elen;
			}
			elems->num_of_quiet_elem++;
			break;
		case WLAN_EID_COUNTRY:
			elems->country_elem = pos;
			elems->country_elem_len = elen;
			break;
		case WLAN_EID_PWR_CONSTRAINT:
835 836 837 838
			if (elen != 1) {
				elem_parse_failed = true;
				break;
			}
839 840 841 842 843 844 845 846 847 848
			elems->pwr_constr_elem = pos;
			break;
		case WLAN_EID_TIMEOUT_INTERVAL:
			elems->timeout_int = pos;
			elems->timeout_int_len = elen;
			break;
		default:
			break;
		}

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		if (elem_parse_failed)
			elems->parse_error = true;
		else
852
			__set_bit(id, seen_elems);
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854 855 856 857
		left -= elen;
		pos += elen;
	}

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	if (left != 0)
		elems->parse_error = true;

861 862 863
	return crc;
}

864 865
void ieee802_11_parse_elems(u8 *start, size_t len,
			    struct ieee802_11_elems *elems)
866 867 868 869
{
	ieee802_11_parse_elems_crc(start, len, elems, 0, 0);
}

870 871
void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata,
			       bool bss_notify)
872 873 874
{
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_tx_queue_params qparam;
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	struct ieee80211_chanctx_conf *chanctx_conf;
876
	int ac;
877
	bool use_11b, enable_qos;
878
	int aCWmin, aCWmax;
879 880 881 882

	if (!local->ops->conf_tx)
		return;

883 884 885
	if (local->hw.queues < IEEE80211_NUM_ACS)
		return;

886 887
	memset(&qparam, 0, sizeof(qparam));

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	rcu_read_lock();
	chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
	use_11b = (chanctx_conf &&
		   chanctx_conf->channel->band == IEEE80211_BAND_2GHZ) &&
892
		 !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE);
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	rcu_read_unlock();
894

895 896 897 898 899 900 901
	/*
	 * By default disable QoS in STA mode for old access points, which do
	 * not support 802.11e. New APs will provide proper queue parameters,
	 * that we will configure later.
	 */
	enable_qos = (sdata->vif.type != NL80211_IFTYPE_STATION);

902
	for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
903 904 905 906 907 908 909
		/* Set defaults according to 802.11-2007 Table 7-37 */
		aCWmax = 1023;
		if (use_11b)
			aCWmin = 31;
		else
			aCWmin = 15;

910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946
		if (enable_qos) {
			switch (ac) {
			case IEEE80211_AC_BK:
				qparam.cw_max = aCWmax;
				qparam.cw_min = aCWmin;
				qparam.txop = 0;
				qparam.aifs = 7;
				break;
			/* never happens but let's not leave undefined */
			default:
			case IEEE80211_AC_BE:
				qparam.cw_max = aCWmax;
				qparam.cw_min = aCWmin;
				qparam.txop = 0;
				qparam.aifs = 3;
				break;
			case IEEE80211_AC_VI:
				qparam.cw_max = aCWmin;
				qparam.cw_min = (aCWmin + 1) / 2 - 1;
				if (use_11b)
					qparam.txop = 6016/32;
				else
					qparam.txop = 3008/32;
				qparam.aifs = 2;
				break;
			case IEEE80211_AC_VO:
				qparam.cw_max = (aCWmin + 1) / 2 - 1;
				qparam.cw_min = (aCWmin + 1) / 4 - 1;
				if (use_11b)
					qparam.txop = 3264/32;
				else
					qparam.txop = 1504/32;
				qparam.aifs = 2;
				break;
			}
		} else {
			/* Confiure old 802.11b/g medium access rules. */
947 948
			qparam.cw_max = aCWmax;
			qparam.cw_min = aCWmin;
949 950 951
			qparam.txop = 0;
			qparam.aifs = 2;
		}
952

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		qparam.uapsd = false;

955 956
		sdata->tx_conf[ac] = qparam;
		drv_conf_tx(local, sdata, ac, &qparam);
957
	}
958

959 960
	if (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
	    sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) {
961
		sdata->vif.bss_conf.qos = enable_qos;
962 963 964
		if (bss_notify)
			ieee80211_bss_info_change_notify(sdata,
							 BSS_CHANGED_QOS);
965
	}
966
}
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968 969 970 971
void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
				  const size_t supp_rates_len,
				  const u8 *supp_rates)
{
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	struct ieee80211_chanctx_conf *chanctx_conf;
973 974 975 976 977 978 979
	int i, have_higher_than_11mbit = 0;

	/* cf. IEEE 802.11 9.2.12 */
	for (i = 0; i < supp_rates_len; i++)
		if ((supp_rates[i] & 0x7f) * 5 > 110)
			have_higher_than_11mbit = 1;

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	rcu_read_lock();
	chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);

	if (chanctx_conf &&
	    chanctx_conf->channel->band == IEEE80211_BAND_2GHZ &&
985 986 987 988
	    have_higher_than_11mbit)
		sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
	else
		sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
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	rcu_read_unlock();
990

991
	ieee80211_set_wmm_default(sdata, true);
992 993
}

994
u32 ieee80211_mandatory_rates(struct ieee80211_local *local,
995 996 997 998
			      enum ieee80211_band band)
{
	struct ieee80211_supported_band *sband;
	struct ieee80211_rate *bitrates;
999
	u32 mandatory_rates;
1000 1001 1002 1003
	enum ieee80211_rate_flags mandatory_flag;
	int i;

	sband = local->hw.wiphy->bands[band];
1004 1005
	if (WARN_ON(!sband))
		return 1;
1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018

	if (band == IEEE80211_BAND_2GHZ)
		mandatory_flag = IEEE80211_RATE_MANDATORY_B;
	else
		mandatory_flag = IEEE80211_RATE_MANDATORY_A;

	bitrates = sband->bitrates;
	mandatory_rates = 0;
	for (i = 0; i < sband->n_bitrates; i++)
		if (bitrates[i].flags & mandatory_flag)
			mandatory_rates |= BIT(i);
	return mandatory_rates;
}
1019 1020

void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
1021
			 u16 transaction, u16 auth_alg, u16 status,
1022 1023
			 u8 *extra, size_t extra_len, const u8 *da,
			 const u8 *bssid, const u8 *key, u8 key_len, u8 key_idx)
1024 1025 1026 1027
{
	struct ieee80211_local *local = sdata->local;
	struct sk_buff *skb;
	struct ieee80211_mgmt *mgmt;
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	int err;
1029 1030

	skb = dev_alloc_skb(local->hw.extra_tx_headroom +
1031
			    sizeof(*mgmt) + 6 + extra_len);
1032
	if (!skb)
1033
		return;
1034

1035 1036 1037 1038 1039 1040
	skb_reserve(skb, local->hw.extra_tx_headroom);

	mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
	memset(mgmt, 0, 24 + 6);
	mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
					  IEEE80211_STYPE_AUTH);
1041
	memcpy(mgmt->da, da, ETH_ALEN);
1042
	memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
1043 1044 1045
	memcpy(mgmt->bssid, bssid, ETH_ALEN);
	mgmt->u.auth.auth_alg = cpu_to_le16(auth_alg);
	mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
1046
	mgmt->u.auth.status_code = cpu_to_le16(status);
1047 1048 1049
	if (extra)
		memcpy(skb_put(skb, extra_len), extra, extra_len);

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	if (auth_alg == WLAN_AUTH_SHARED_KEY && transaction == 3) {
		mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
		err = ieee80211_wep_encrypt(local, skb, key, key_len, key_idx);
		WARN_ON(err);
	}

1056 1057
	IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
	ieee80211_tx_skb(sdata, skb);
1058 1059
}

1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098
void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
				    const u8 *bssid, u16 stype, u16 reason,
				    bool send_frame, u8 *frame_buf)
{
	struct ieee80211_local *local = sdata->local;
	struct sk_buff *skb;
	struct ieee80211_mgmt *mgmt = (void *)frame_buf;

	/* build frame */
	mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
	mgmt->duration = 0; /* initialize only */
	mgmt->seq_ctrl = 0; /* initialize only */
	memcpy(mgmt->da, bssid, ETH_ALEN);
	memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
	memcpy(mgmt->bssid, bssid, ETH_ALEN);
	/* u.deauth.reason_code == u.disassoc.reason_code */
	mgmt->u.deauth.reason_code = cpu_to_le16(reason);

	if (send_frame) {
		skb = dev_alloc_skb(local->hw.extra_tx_headroom +
				    IEEE80211_DEAUTH_FRAME_LEN);
		if (!skb)
			return;

		skb_reserve(skb, local->hw.extra_tx_headroom);

		/* copy in frame */
		memcpy(skb_put(skb, IEEE80211_DEAUTH_FRAME_LEN),
		       mgmt, IEEE80211_DEAUTH_FRAME_LEN);

		if (sdata->vif.type != NL80211_IFTYPE_STATION ||
		    !(sdata->u.mgd.flags & IEEE80211_STA_MFP_ENABLED))
			IEEE80211_SKB_CB(skb)->flags |=
				IEEE80211_TX_INTFL_DONT_ENCRYPT;

		ieee80211_tx_skb(sdata, skb);
	}
}

1099
int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer,
1100
			     const u8 *ie, size_t ie_len,
1101 1102
			     enum ieee80211_band band, u32 rate_mask,
			     u8 channel)
1103 1104
{
	struct ieee80211_supported_band *sband;
1105 1106 1107
	u8 *pos;
	size_t offset = 0, noffset;
	int supp_rates_len, i;
1108 1109 1110
	u8 rates[32];
	int num_rates;
	int ext_rates_len;
1111

1112
	sband = local->hw.wiphy->bands[band];
1113 1114
	if (WARN_ON_ONCE(!sband))
		return 0;
1115 1116 1117

	pos = buffer;

1118 1119 1120 1121 1122 1123 1124 1125
	num_rates = 0;
	for (i = 0; i < sband->n_bitrates; i++) {
		if ((BIT(i) & rate_mask) == 0)
			continue; /* skip rate */
		rates[num_rates++] = (u8) (sband->bitrates[i].bitrate / 5);
	}

	supp_rates_len = min_t(int, num_rates, 8);
1126

1127
	*pos++ = WLAN_EID_SUPP_RATES;
1128
	*pos++ = supp_rates_len;
1129 1130
	memcpy(pos, rates, supp_rates_len);
	pos += supp_rates_len;
1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147

	/* insert "request information" if in custom IEs */
	if (ie && ie_len) {
		static const u8 before_extrates[] = {
			WLAN_EID_SSID,
			WLAN_EID_SUPP_RATES,
			WLAN_EID_REQUEST,
		};
		noffset = ieee80211_ie_split(ie, ie_len,
					     before_extrates,
					     ARRAY_SIZE(before_extrates),
					     offset);
		memcpy(pos, ie + offset, noffset - offset);
		pos += noffset - offset;
		offset = noffset;
	}

1148 1149
	ext_rates_len = num_rates - supp_rates_len;
	if (ext_rates_len > 0) {
1150
		*pos++ = WLAN_EID_EXT_SUPP_RATES;
1151 1152 1153
		*pos++ = ext_rates_len;
		memcpy(pos, rates + supp_rates_len, ext_rates_len);
		pos += ext_rates_len;
1154 1155
	}

1156 1157 1158 1159 1160 1161
	if (channel && sband->band == IEEE80211_BAND_2GHZ) {
		*pos++ = WLAN_EID_DS_PARAMS;
		*pos++ = 1;
		*pos++ = channel;
	}

1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177
	/* insert custom IEs that go before HT */
	if (ie && ie_len) {
		static const u8 before_ht[] = {
			WLAN_EID_SSID,
			WLAN_EID_SUPP_RATES,
			WLAN_EID_REQUEST,
			WLAN_EID_EXT_SUPP_RATES,
			WLAN_EID_DS_PARAMS,
			WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
		};
		noffset = ieee80211_ie_split(ie, ie_len,
					     before_ht, ARRAY_SIZE(before_ht),
					     offset);
		memcpy(pos, ie + offset, noffset - offset);
		pos += noffset - offset;
		offset = noffset;
1178 1179
	}

1180
	if (sband->ht_cap.ht_supported)
B
Ben Greear 已提交
1181 1182
		pos = ieee80211_ie_build_ht_cap(pos, &sband->ht_cap,
						sband->ht_cap.cap);
1183

1184 1185 1186 1187 1188
	/*
	 * If adding more here, adjust code in main.c
	 * that calculates local->scan_ies_len.
	 */

1189 1190 1191 1192 1193
	/* add any remaining custom IEs */
	if (ie && ie_len) {
		noffset = ie_len;
		memcpy(pos, ie + offset, noffset - offset);
		pos += noffset - offset;
1194 1195
	}

1196 1197 1198 1199
	if (sband->vht_cap.vht_supported)
		pos = ieee80211_ie_build_vht_cap(pos, &sband->vht_cap,
						 sband->vht_cap.cap);

1200 1201 1202
	return pos - buffer;
}

1203
struct sk_buff *ieee80211_build_probe_req(struct ieee80211_sub_if_data *sdata,
1204
					  u8 *dst, u32 ratemask,
1205
					  struct ieee80211_channel *chan,
1206
					  const u8 *ssid, size_t ssid_len,
1207 1208
					  const u8 *ie, size_t ie_len,
					  bool directed)
1209 1210 1211 1212
{
	struct ieee80211_local *local = sdata->local;
	struct sk_buff *skb;
	struct ieee80211_mgmt *mgmt;
1213 1214
	size_t buf_len;
	u8 *buf;
1215
	u8 chan_no;
1216 1217 1218

	/* FIXME: come up with a proper value */
	buf = kmalloc(200 + ie_len, GFP_KERNEL);
1219
	if (!buf)
1220
		return NULL;
1221

1222 1223 1224 1225 1226 1227
	/*
	 * Do not send DS Channel parameter for directed probe requests
	 * in order to maximize the chance that we get a response.  Some
	 * badly-behaved APs don't respond when this parameter is included.
	 */
	if (directed)
1228
		chan_no = 0;
1229
	else
1230
		chan_no = ieee80211_frequency_to_channel(chan->center_freq);
1231

1232 1233
	buf_len = ieee80211_build_preq_ies(local, buf, ie, ie_len, chan->band,
					   ratemask, chan_no);
1234 1235 1236 1237

	skb = ieee80211_probereq_get(&local->hw, &sdata->vif,
				     ssid, ssid_len,
				     buf, buf_len);
1238 1239
	if (!skb)
		goto out;
1240

1241
	if (dst) {
1242
		mgmt = (struct ieee80211_mgmt *) skb->data;
1243 1244 1245 1246
		memcpy(mgmt->da, dst, ETH_ALEN);
		memcpy(mgmt->bssid, dst, ETH_ALEN);
	}

1247
	IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1248 1249

 out:
1250
	kfree(buf);
1251 1252 1253 1254 1255 1256

	return skb;
}

void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
			      const u8 *ssid, size_t ssid_len,
1257
			      const u8 *ie, size_t ie_len,
1258
			      u32 ratemask, bool directed, bool no_cck,
J
Johannes Berg 已提交
1259
			      struct ieee80211_channel *channel, bool scan)
1260 1261 1262
{
	struct sk_buff *skb;

1263
	skb = ieee80211_build_probe_req(sdata, dst, ratemask, channel,
1264
					ssid, ssid_len,
1265
					ie, ie_len, directed);
1266 1267 1268 1269
	if (skb) {
		if (no_cck)
			IEEE80211_SKB_CB(skb)->flags |=
				IEEE80211_TX_CTL_NO_CCK_RATE;
J
Johannes Berg 已提交
1270 1271 1272 1273
		if (scan)
			ieee80211_tx_skb_tid_band(sdata, skb, 7, channel->band);
		else
			ieee80211_tx_skb(sdata, skb);
1274
	}
1275 1276 1277 1278
}

u32 ieee80211_sta_get_rates(struct ieee80211_local *local,
			    struct ieee802_11_elems *elems,
1279
			    enum ieee80211_band band, u32 *basic_rates)
1280 1281 1282 1283 1284 1285 1286 1287
{
	struct ieee80211_supported_band *sband;
	struct ieee80211_rate *bitrates;
	size_t num_rates;
	u32 supp_rates;
	int i, j;
	sband = local->hw.wiphy->bands[band];

1288 1289
	if (WARN_ON(!sband))
		return 1;
1290 1291 1292 1293 1294 1295 1296 1297

	bitrates = sband->bitrates;
	num_rates = sband->n_bitrates;
	supp_rates = 0;
	for (i = 0; i < elems->supp_rates_len +
		     elems->ext_supp_rates_len; i++) {
		u8 rate = 0;
		int own_rate;
1298
		bool is_basic;
1299 1300 1301 1302 1303 1304
		if (i < elems->supp_rates_len)
			rate = elems->supp_rates[i];
		else if (elems->ext_supp_rates)
			rate = elems->ext_supp_rates
				[i - elems->supp_rates_len];
		own_rate = 5 * (rate & 0x7f);
1305 1306 1307 1308 1309 1310 1311
		is_basic = !!(rate & 0x80);

		if (is_basic && (rate & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
			continue;

		for (j = 0; j < num_rates; j++) {
			if (bitrates[j].bitrate == own_rate) {
1312
				supp_rates |= BIT(j);
1313 1314 1315 1316
				if (basic_rates && is_basic)
					*basic_rates |= BIT(j);
			}
		}
1317 1318 1319
	}
	return supp_rates;
}
1320

1321 1322 1323
void ieee80211_stop_device(struct ieee80211_local *local)
{
	ieee80211_led_radio(local, false);
1324
	ieee80211_mod_tpt_led_trig(local, 0, IEEE80211_TPT_LEDTRIG_FL_RADIO);
1325 1326 1327 1328

	cancel_work_sync(&local->reconfig_filter);

	flush_workqueue(local->workqueue);
1329
	drv_stop(local);
1330 1331
}

1332 1333 1334 1335
int ieee80211_reconfig(struct ieee80211_local *local)
{
	struct ieee80211_hw *hw = &local->hw;
	struct ieee80211_sub_if_data *sdata;
J
Johannes Berg 已提交
1336
	struct ieee80211_chanctx *ctx;
1337
	struct sta_info *sta;
1338
	int res, i;
1339

1340
#ifdef CONFIG_PM
J
Johannes Berg 已提交
1341 1342
	if (local->suspended)
		local->resuming = true;
1343

1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359
	if (local->wowlan) {
		local->wowlan = false;
		res = drv_resume(local);
		if (res < 0) {
			local->resuming = false;
			return res;
		}
		if (res == 0)
			goto wake_up;
		WARN_ON(res > 1);
		/*
		 * res is 1, which means the driver requested
		 * to go through a regular reset on wakeup.
		 */
	}
#endif
1360 1361 1362
	/* everything else happens only if HW was up & running */
	if (!local->open_count)
		goto wake_up;
1363

1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375
	/*
	 * Upon resume hardware can sometimes be goofy due to
	 * various platform / driver / bus issues, so restarting
	 * the device may at times not work immediately. Propagate
	 * the error.
	 */
	res = drv_start(local);
	if (res) {
		WARN(local->suspended, "Hardware became unavailable "
		     "upon resume. This could be a software issue "
		     "prior to suspend or a hardware issue.\n");
		return res;
1376 1377
	}

1378 1379 1380 1381 1382 1383 1384 1385 1386
	/* setup fragmentation threshold */
	drv_set_frag_threshold(local, hw->wiphy->frag_threshold);

	/* setup RTS threshold */
	drv_set_rts_threshold(local, hw->wiphy->rts_threshold);

	/* reset coverage class */
	drv_set_coverage_class(local, hw->wiphy->coverage_class);

1387 1388 1389 1390
	ieee80211_led_radio(local, true);
	ieee80211_mod_tpt_led_trig(local,
				   IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);

1391
	/* add interfaces */
1392 1393 1394 1395 1396 1397 1398 1399 1400 1401
	sdata = rtnl_dereference(local->monitor_sdata);
	if (sdata) {
		res = drv_add_interface(local, sdata);
		if (WARN_ON(res)) {
			rcu_assign_pointer(local->monitor_sdata, NULL);
			synchronize_net();
			kfree(sdata);
		}
	}

1402 1403 1404
	list_for_each_entry(sdata, &local->interfaces, list) {
		if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
		    sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1405
		    ieee80211_sdata_running(sdata))
1406
			res = drv_add_interface(local, sdata);
1407 1408
	}

J
Johannes Berg 已提交
1409 1410 1411 1412 1413 1414
	/* add channel contexts */
	mutex_lock(&local->chanctx_mtx);
	list_for_each_entry(ctx, &local->chanctx_list, list)
		WARN_ON(drv_add_chanctx(local, ctx));
	mutex_unlock(&local->chanctx_mtx);

1415
	/* add STAs back */
1416 1417
	mutex_lock(&local->sta_mtx);
	list_for_each_entry(sta, &local->sta_list, list) {
1418
		enum ieee80211_sta_state state;
J
Johannes Berg 已提交
1419

1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430
		if (!sta->uploaded)
			continue;

		/* AP-mode stations will be added later */
		if (sta->sdata->vif.type == NL80211_IFTYPE_AP)
			continue;

		for (state = IEEE80211_STA_NOTEXIST;
		     state < sta->sta_state; state++)
			WARN_ON(drv_sta_state(local, sta->sdata, sta, state,
					      state + 1));
1431
	}
1432
	mutex_unlock(&local->sta_mtx);
1433

1434
	/* reconfigure tx conf */
1435 1436 1437 1438 1439 1440
	if (hw->queues >= IEEE80211_NUM_ACS) {
		list_for_each_entry(sdata, &local->interfaces, list) {
			if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
			    sdata->vif.type == NL80211_IFTYPE_MONITOR ||
			    !ieee80211_sdata_running(sdata))
				continue;
1441

1442 1443 1444 1445
			for (i = 0; i < IEEE80211_NUM_ACS; i++)
				drv_conf_tx(local, sdata, i,
					    &sdata->tx_conf[i]);
		}
1446
	}
1447

1448 1449 1450 1451 1452 1453 1454
	/* reconfigure hardware */
	ieee80211_hw_config(local, ~0);

	ieee80211_configure_filter(local);

	/* Finally also reconfigure all the BSS information */
	list_for_each_entry(sdata, &local->interfaces, list) {
J
Johannes Berg 已提交
1455
		struct ieee80211_chanctx_conf *ctx_conf;
1456 1457
		u32 changed;

1458
		if (!ieee80211_sdata_running(sdata))
1459
			continue;
1460

J
Johannes Berg 已提交
1461 1462 1463 1464 1465 1466 1467 1468 1469 1470
		mutex_lock(&local->chanctx_mtx);
		ctx_conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
				lockdep_is_held(&local->chanctx_mtx));
		if (ctx_conf) {
			ctx = container_of(ctx_conf, struct ieee80211_chanctx,
					   conf);
			drv_assign_vif_chanctx(local, sdata, ctx);
		}
		mutex_unlock(&local->chanctx_mtx);

1471 1472 1473 1474 1475 1476 1477 1478
		/* common change flags for all interface types */
		changed = BSS_CHANGED_ERP_CTS_PROT |
			  BSS_CHANGED_ERP_PREAMBLE |
			  BSS_CHANGED_ERP_SLOT |
			  BSS_CHANGED_HT |
			  BSS_CHANGED_BASIC_RATES |
			  BSS_CHANGED_BEACON_INT |
			  BSS_CHANGED_BSSID |
1479
			  BSS_CHANGED_CQM |
1480 1481
			  BSS_CHANGED_QOS |
			  BSS_CHANGED_IDLE;
1482

1483 1484
		switch (sdata->vif.type) {
		case NL80211_IFTYPE_STATION:
1485
			changed |= BSS_CHANGED_ASSOC |
E
Eliad Peller 已提交
1486 1487
				   BSS_CHANGED_ARP_FILTER |
				   BSS_CHANGED_PS;
1488
			mutex_lock(&sdata->u.mgd.mtx);
1489
			ieee80211_bss_info_change_notify(sdata, changed);
1490
			mutex_unlock(&sdata->u.mgd.mtx);
1491
			break;
1492
		case NL80211_IFTYPE_ADHOC:
1493 1494
			changed |= BSS_CHANGED_IBSS;
			/* fall through */
1495
		case NL80211_IFTYPE_AP:
1496 1497
			changed |= BSS_CHANGED_SSID;

1498
			if (sdata->vif.type == NL80211_IFTYPE_AP) {
1499 1500
				changed |= BSS_CHANGED_AP_PROBE_RESP;

1501 1502 1503 1504
				if (rcu_access_pointer(sdata->u.ap.beacon))
					drv_start_ap(local, sdata);
			}

1505
			/* fall through */
1506
		case NL80211_IFTYPE_MESH_POINT:
1507 1508
			changed |= BSS_CHANGED_BEACON |
				   BSS_CHANGED_BEACON_ENABLED;
1509
			ieee80211_bss_info_change_notify(sdata, changed);
1510 1511 1512 1513 1514 1515 1516
			break;
		case NL80211_IFTYPE_WDS:
			break;
		case NL80211_IFTYPE_AP_VLAN:
		case NL80211_IFTYPE_MONITOR:
			/* ignore virtual */
			break;
1517
		case NL80211_IFTYPE_P2P_DEVICE:
1518 1519
			changed = BSS_CHANGED_IDLE;
			break;
1520
		case NL80211_IFTYPE_UNSPECIFIED:
1521
		case NUM_NL80211_IFTYPES:
1522 1523
		case NL80211_IFTYPE_P2P_CLIENT:
		case NL80211_IFTYPE_P2P_GO:
1524 1525 1526 1527 1528
			WARN_ON(1);
			break;
		}
	}

1529 1530
	ieee80211_recalc_ps(local, -1);

1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545
	/*
	 * The sta might be in psm against the ap (e.g. because
	 * this was the state before a hw restart), so we
	 * explicitly send a null packet in order to make sure
	 * it'll sync against the ap (and get out of psm).
	 */
	if (!(local->hw.conf.flags & IEEE80211_CONF_PS)) {
		list_for_each_entry(sdata, &local->interfaces, list) {
			if (sdata->vif.type != NL80211_IFTYPE_STATION)
				continue;

			ieee80211_send_nullfunc(local, sdata, 0);
		}
	}

1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563
	/* APs are now beaconing, add back stations */
	mutex_lock(&local->sta_mtx);
	list_for_each_entry(sta, &local->sta_list, list) {
		enum ieee80211_sta_state state;

		if (!sta->uploaded)
			continue;

		if (sta->sdata->vif.type != NL80211_IFTYPE_AP)
			continue;

		for (state = IEEE80211_STA_NOTEXIST;
		     state < sta->sta_state; state++)
			WARN_ON(drv_sta_state(local, sta->sdata, sta, state,
					      state + 1));
	}
	mutex_unlock(&local->sta_mtx);

1564 1565 1566 1567 1568
	/* add back keys */
	list_for_each_entry(sdata, &local->interfaces, list)
		if (ieee80211_sdata_running(sdata))
			ieee80211_enable_keys(sdata);

1569
 wake_up:
1570 1571 1572
	local->in_reconfig = false;
	barrier();

1573 1574 1575 1576 1577 1578 1579 1580 1581 1582
	/*
	 * Clear the WLAN_STA_BLOCK_BA flag so new aggregation
	 * sessions can be established after a resume.
	 *
	 * Also tear down aggregation sessions since reconfiguring
	 * them in a hardware restart scenario is not easily done
	 * right now, and the hardware will have lost information
	 * about the sessions, but we and the AP still think they
	 * are active. This is really a workaround though.
	 */
1583
	if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
1584 1585 1586
		mutex_lock(&local->sta_mtx);

		list_for_each_entry(sta, &local->sta_list, list) {
1587
			ieee80211_sta_tear_down_BA_sessions(sta, true);
J
Johannes Berg 已提交
1588
			clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
1589
		}
1590 1591

		mutex_unlock(&local->sta_mtx);
1592 1593
	}

1594 1595 1596
	ieee80211_wake_queues_by_reason(hw,
			IEEE80211_QUEUE_STOP_REASON_SUSPEND);

1597 1598 1599 1600
	/*
	 * If this is for hw restart things are still running.
	 * We may want to change that later, however.
	 */
J
Johannes Berg 已提交
1601
	if (!local->suspended)
1602 1603 1604
		return 0;

#ifdef CONFIG_PM
J
Johannes Berg 已提交
1605
	/* first set suspended false, then resuming */
1606
	local->suspended = false;
J
Johannes Berg 已提交
1607 1608
	mb();
	local->resuming = false;
1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625

	list_for_each_entry(sdata, &local->interfaces, list) {
		switch(sdata->vif.type) {
		case NL80211_IFTYPE_STATION:
			ieee80211_sta_restart(sdata);
			break;
		case NL80211_IFTYPE_ADHOC:
			ieee80211_ibss_restart(sdata);
			break;
		case NL80211_IFTYPE_MESH_POINT:
			ieee80211_mesh_restart(sdata);
			break;
		default:
			break;
		}
	}

1626
	mod_timer(&local->sta_cleanup, jiffies + 1);
1627

1628
	mutex_lock(&local->sta_mtx);
1629 1630
	list_for_each_entry(sta, &local->sta_list, list)
		mesh_plink_restart(sta);
1631
	mutex_unlock(&local->sta_mtx);
1632 1633 1634
#else
	WARN_ON(1);
#endif
1635 1636
	return 0;
}
1637

1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664
void ieee80211_resume_disconnect(struct ieee80211_vif *vif)
{
	struct ieee80211_sub_if_data *sdata;
	struct ieee80211_local *local;
	struct ieee80211_key *key;

	if (WARN_ON(!vif))
		return;

	sdata = vif_to_sdata(vif);
	local = sdata->local;

	if (WARN_ON(!local->resuming))
		return;

	if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
		return;

	sdata->flags |= IEEE80211_SDATA_DISCONNECT_RESUME;

	mutex_lock(&local->key_mtx);
	list_for_each_entry(key, &sdata->key_list, list)
		key->flags |= KEY_FLAG_TAINTED;
	mutex_unlock(&local->key_mtx);
}
EXPORT_SYMBOL_GPL(ieee80211_resume_disconnect);

1665
void ieee80211_recalc_smps(struct ieee80211_sub_if_data *sdata)
1666
{
1667 1668 1669
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_chanctx_conf *chanctx_conf;
	struct ieee80211_chanctx *chanctx;
1670

1671
	mutex_lock(&local->chanctx_mtx);
1672

1673 1674
	chanctx_conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
					lockdep_is_held(&local->chanctx_mtx));
1675

1676
	if (WARN_ON_ONCE(!chanctx_conf))
1677
		goto unlock;
1678

1679 1680
	chanctx = container_of(chanctx_conf, struct ieee80211_chanctx, conf);
	ieee80211_recalc_smps_chanctx(local, chanctx);
1681
 unlock:
1682
	mutex_unlock(&local->chanctx_mtx);
1683
}
1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739

static bool ieee80211_id_in_list(const u8 *ids, int n_ids, u8 id)
{
	int i;

	for (i = 0; i < n_ids; i++)
		if (ids[i] == id)
			return true;
	return false;
}

/**
 * ieee80211_ie_split - split an IE buffer according to ordering
 *
 * @ies: the IE buffer
 * @ielen: the length of the IE buffer
 * @ids: an array with element IDs that are allowed before
 *	the split
 * @n_ids: the size of the element ID array
 * @offset: offset where to start splitting in the buffer
 *
 * This function splits an IE buffer by updating the @offset
 * variable to point to the location where the buffer should be
 * split.
 *
 * It assumes that the given IE buffer is well-formed, this
 * has to be guaranteed by the caller!
 *
 * It also assumes that the IEs in the buffer are ordered
 * correctly, if not the result of using this function will not
 * be ordered correctly either, i.e. it does no reordering.
 *
 * The function returns the offset where the next part of the
 * buffer starts, which may be @ielen if the entire (remainder)
 * of the buffer should be used.
 */
size_t ieee80211_ie_split(const u8 *ies, size_t ielen,
			  const u8 *ids, int n_ids, size_t offset)
{
	size_t pos = offset;

	while (pos < ielen && ieee80211_id_in_list(ids, n_ids, ies[pos]))
		pos += 2 + ies[pos + 1];

	return pos;
}

size_t ieee80211_ie_split_vendor(const u8 *ies, size_t ielen, size_t offset)
{
	size_t pos = offset;

	while (pos < ielen && ies[pos] != WLAN_EID_VENDOR_SPECIFIC)
		pos += 2 + ies[pos + 1];

	return pos;
}
1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779

static void _ieee80211_enable_rssi_reports(struct ieee80211_sub_if_data *sdata,
					    int rssi_min_thold,
					    int rssi_max_thold)
{
	trace_api_enable_rssi_reports(sdata, rssi_min_thold, rssi_max_thold);

	if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
		return;

	/*
	 * Scale up threshold values before storing it, as the RSSI averaging
	 * algorithm uses a scaled up value as well. Change this scaling
	 * factor if the RSSI averaging algorithm changes.
	 */
	sdata->u.mgd.rssi_min_thold = rssi_min_thold*16;
	sdata->u.mgd.rssi_max_thold = rssi_max_thold*16;
}

void ieee80211_enable_rssi_reports(struct ieee80211_vif *vif,
				    int rssi_min_thold,
				    int rssi_max_thold)
{
	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);

	WARN_ON(rssi_min_thold == rssi_max_thold ||
		rssi_min_thold > rssi_max_thold);

	_ieee80211_enable_rssi_reports(sdata, rssi_min_thold,
				       rssi_max_thold);
}
EXPORT_SYMBOL(ieee80211_enable_rssi_reports);

void ieee80211_disable_rssi_reports(struct ieee80211_vif *vif)
{
	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);

	_ieee80211_enable_rssi_reports(sdata, 0, 0);
}
EXPORT_SYMBOL(ieee80211_disable_rssi_reports);
1780

B
Ben Greear 已提交
1781
u8 *ieee80211_ie_build_ht_cap(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap,
1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795
			      u16 cap)
{
	__le16 tmp;

	*pos++ = WLAN_EID_HT_CAPABILITY;
	*pos++ = sizeof(struct ieee80211_ht_cap);
	memset(pos, 0, sizeof(struct ieee80211_ht_cap));

	/* capability flags */
	tmp = cpu_to_le16(cap);
	memcpy(pos, &tmp, sizeof(u16));
	pos += sizeof(u16);

	/* AMPDU parameters */
B
Ben Greear 已提交
1796 1797
	*pos++ = ht_cap->ampdu_factor |
		 (ht_cap->ampdu_density <<
1798 1799 1800
			IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT);

	/* MCS set */
B
Ben Greear 已提交
1801 1802
	memcpy(pos, &ht_cap->mcs, sizeof(ht_cap->mcs));
	pos += sizeof(ht_cap->mcs);
1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815

	/* extended capabilities */
	pos += sizeof(__le16);

	/* BF capabilities */
	pos += sizeof(__le32);

	/* antenna selection */
	pos += sizeof(u8);

	return pos;
}

1816 1817 1818 1819 1820 1821
u8 *ieee80211_ie_build_vht_cap(u8 *pos, struct ieee80211_sta_vht_cap *vht_cap,
							   u32 cap)
{
	__le32 tmp;

	*pos++ = WLAN_EID_VHT_CAPABILITY;
M
Mahesh Palivela 已提交
1822 1823
	*pos++ = sizeof(struct ieee80211_vht_cap);
	memset(pos, 0, sizeof(struct ieee80211_vht_cap));
1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836

	/* capability flags */
	tmp = cpu_to_le32(cap);
	memcpy(pos, &tmp, sizeof(u32));
	pos += sizeof(u32);

	/* VHT MCS set */
	memcpy(pos, &vht_cap->vht_mcs, sizeof(vht_cap->vht_mcs));
	pos += sizeof(vht_cap->vht_mcs);

	return pos;
}

1837
u8 *ieee80211_ie_build_ht_oper(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap,
1838
			       struct ieee80211_channel *channel,
1839 1840
			       enum nl80211_channel_type channel_type,
			       u16 prot_mode)
1841
{
1842
	struct ieee80211_ht_operation *ht_oper;
1843
	/* Build HT Information */
1844 1845 1846 1847
	*pos++ = WLAN_EID_HT_OPERATION;
	*pos++ = sizeof(struct ieee80211_ht_operation);
	ht_oper = (struct ieee80211_ht_operation *)pos;
	ht_oper->primary_chan =
1848 1849 1850
			ieee80211_frequency_to_channel(channel->center_freq);
	switch (channel_type) {
	case NL80211_CHAN_HT40MINUS:
1851
		ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_BELOW;
1852 1853
		break;
	case NL80211_CHAN_HT40PLUS:
1854
		ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
1855 1856 1857
		break;
	case NL80211_CHAN_HT20:
	default:
1858
		ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_NONE;
1859 1860
		break;
	}
1861 1862 1863
	if (ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 &&
	    channel_type != NL80211_CHAN_NO_HT &&
	    channel_type != NL80211_CHAN_HT20)
1864
		ht_oper->ht_param |= IEEE80211_HT_PARAM_CHAN_WIDTH_ANY;
1865

1866
	ht_oper->operation_mode = cpu_to_le16(prot_mode);
1867
	ht_oper->stbc_param = 0x0000;
1868 1869 1870

	/* It seems that Basic MCS set and Supported MCS set
	   are identical for the first 10 bytes */
1871 1872
	memset(&ht_oper->basic_set, 0, 16);
	memcpy(&ht_oper->basic_set, &ht_cap->mcs, 10);
1873

1874
	return pos + sizeof(struct ieee80211_ht_operation);
1875 1876 1877
}

enum nl80211_channel_type
1878
ieee80211_ht_oper_to_channel_type(struct ieee80211_ht_operation *ht_oper)
1879 1880 1881
{
	enum nl80211_channel_type channel_type;

1882
	if (!ht_oper)
1883 1884
		return NL80211_CHAN_NO_HT;

1885
	switch (ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901
	case IEEE80211_HT_PARAM_CHA_SEC_NONE:
		channel_type = NL80211_CHAN_HT20;
		break;
	case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
		channel_type = NL80211_CHAN_HT40PLUS;
		break;
	case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
		channel_type = NL80211_CHAN_HT40MINUS;
		break;
	default:
		channel_type = NL80211_CHAN_NO_HT;
	}

	return channel_type;
}

1902
int ieee80211_add_srates_ie(struct ieee80211_sub_if_data *sdata,
1903 1904
			    struct sk_buff *skb, bool need_basic,
			    enum ieee80211_band band)
1905 1906 1907 1908 1909
{
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_supported_band *sband;
	int rate;
	u8 i, rates, *pos;
1910
	u32 basic_rates = sdata->vif.bss_conf.basic_rates;
1911

1912
	sband = local->hw.wiphy->bands[band];
1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923
	rates = sband->n_bitrates;
	if (rates > 8)
		rates = 8;

	if (skb_tailroom(skb) < rates + 2)
		return -ENOMEM;

	pos = skb_put(skb, rates + 2);
	*pos++ = WLAN_EID_SUPP_RATES;
	*pos++ = rates;
	for (i = 0; i < rates; i++) {
1924 1925 1926
		u8 basic = 0;
		if (need_basic && basic_rates & BIT(i))
			basic = 0x80;
1927
		rate = sband->bitrates[i].bitrate;
1928
		*pos++ = basic | (u8) (rate / 5);
1929 1930 1931 1932 1933
	}

	return 0;
}

1934
int ieee80211_add_ext_srates_ie(struct ieee80211_sub_if_data *sdata,
1935 1936
				struct sk_buff *skb, bool need_basic,
				enum ieee80211_band band)
1937 1938 1939 1940 1941
{
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_supported_band *sband;
	int rate;
	u8 i, exrates, *pos;
1942
	u32 basic_rates = sdata->vif.bss_conf.basic_rates;
1943

1944
	sband = local->hw.wiphy->bands[band];
1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958
	exrates = sband->n_bitrates;
	if (exrates > 8)
		exrates -= 8;
	else
		exrates = 0;

	if (skb_tailroom(skb) < exrates + 2)
		return -ENOMEM;

	if (exrates) {
		pos = skb_put(skb, exrates + 2);
		*pos++ = WLAN_EID_EXT_SUPP_RATES;
		*pos++ = exrates;
		for (i = 8; i < sband->n_bitrates; i++) {
1959 1960 1961
			u8 basic = 0;
			if (need_basic && basic_rates & BIT(i))
				basic = 0x80;
1962
			rate = sband->bitrates[i].bitrate;
1963
			*pos++ = basic | (u8) (rate / 5);
1964 1965 1966 1967
		}
	}
	return 0;
}
1968 1969 1970 1971 1972 1973

int ieee80211_ave_rssi(struct ieee80211_vif *vif)
{
	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;

1974 1975 1976 1977
	if (WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_STATION)) {
		/* non-managed type inferfaces */
		return 0;
	}
1978 1979
	return ifmgd->ave_beacon_signal;
}
1980
EXPORT_SYMBOL_GPL(ieee80211_ave_rssi);
1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996

u8 ieee80211_mcs_to_chains(const struct ieee80211_mcs_info *mcs)
{
	if (!mcs)
		return 1;

	/* TODO: consider rx_highest */

	if (mcs->rx_mask[3])
		return 4;
	if (mcs->rx_mask[2])
		return 3;
	if (mcs->rx_mask[1])
		return 2;
	return 1;
}