util.c 56.3 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,
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				     unsigned long queues,
				     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_each_set_bit(i, &queues, hw->queues)
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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)
{
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	ieee80211_stop_queues_by_reason(hw, IEEE80211_MAX_QUEUE_MAP,
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					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);
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	ret = test_bit(IEEE80211_QUEUE_STOP_REASON_DRIVER,
		       &local->queue_stop_reasons[queue]);
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	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,
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				     unsigned long queues,
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				     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_each_set_bit(i, &queues, hw->queues)
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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)
{
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	ieee80211_wake_queues_by_reason(hw, IEEE80211_MAX_QUEUE_MAP,
					IEEE80211_QUEUE_STOP_REASON_DRIVER);
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}
EXPORT_SYMBOL(ieee80211_wake_queues);
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void ieee80211_flush_queues(struct ieee80211_local *local,
			    struct ieee80211_sub_if_data *sdata)
{
	u32 queues;

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

	if (sdata && local->hw.flags & IEEE80211_HW_QUEUE_CONTROL) {
		int ac;

		queues = 0;

		for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
			queues |= BIT(sdata->vif.hw_queue[ac]);
		if (sdata->vif.cab_queue != IEEE80211_INVAL_HW_QUEUE)
			queues |= BIT(sdata->vif.cab_queue);
	} else {
		/* all queues */
		queues = BIT(local->hw.queues) - 1;
	}

540 541 542
	ieee80211_stop_queues_by_reason(&local->hw, IEEE80211_MAX_QUEUE_MAP,
					IEEE80211_QUEUE_STOP_REASON_FLUSH);

543
	drv_flush(local, queues, false);
544 545 546

	ieee80211_wake_queues_by_reason(&local->hw, IEEE80211_MAX_QUEUE_MAP,
					IEEE80211_QUEUE_STOP_REASON_FLUSH);
547 548
}

549
void ieee80211_iterate_active_interfaces(
550
	struct ieee80211_hw *hw, u32 iter_flags,
551 552 553
	void (*iterator)(void *data, u8 *mac,
			 struct ieee80211_vif *vif),
	void *data)
554 555 556 557
{
	struct ieee80211_local *local = hw_to_local(hw);
	struct ieee80211_sub_if_data *sdata;

558
	mutex_lock(&local->iflist_mtx);
559 560 561

	list_for_each_entry(sdata, &local->interfaces, list) {
		switch (sdata->vif.type) {
562
		case NL80211_IFTYPE_MONITOR:
563 564 565
			if (!(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE))
				continue;
			break;
566
		case NL80211_IFTYPE_AP_VLAN:
567
			continue;
568
		default:
569 570
			break;
		}
571 572 573
		if (!(iter_flags & IEEE80211_IFACE_ITER_RESUME_ALL) &&
		    !(sdata->flags & IEEE80211_SDATA_IN_DRIVER))
			continue;
574
		if (ieee80211_sdata_running(sdata))
575
			iterator(data, sdata->vif.addr,
576 577 578
				 &sdata->vif);
	}

579 580
	sdata = rcu_dereference_protected(local->monitor_sdata,
					  lockdep_is_held(&local->iflist_mtx));
581 582 583
	if (sdata &&
	    (iter_flags & IEEE80211_IFACE_ITER_RESUME_ALL ||
	     sdata->flags & IEEE80211_SDATA_IN_DRIVER))
584 585
		iterator(data, sdata->vif.addr, &sdata->vif);

586
	mutex_unlock(&local->iflist_mtx);
587 588 589 590
}
EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces);

void ieee80211_iterate_active_interfaces_atomic(
591
	struct ieee80211_hw *hw, u32 iter_flags,
592 593 594 595 596 597 598
	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;

599
	rcu_read_lock();
600

601
	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
602
		switch (sdata->vif.type) {
603
		case NL80211_IFTYPE_MONITOR:
604 605 606
			if (!(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE))
				continue;
			break;
607
		case NL80211_IFTYPE_AP_VLAN:
608
			continue;
609
		default:
610 611
			break;
		}
612 613 614
		if (!(iter_flags & IEEE80211_IFACE_ITER_RESUME_ALL) &&
		    !(sdata->flags & IEEE80211_SDATA_IN_DRIVER))
			continue;
615
		if (ieee80211_sdata_running(sdata))
616
			iterator(data, sdata->vif.addr,
617
				 &sdata->vif);
618
	}
619

620
	sdata = rcu_dereference(local->monitor_sdata);
621 622 623
	if (sdata &&
	    (iter_flags & IEEE80211_IFACE_ITER_RESUME_ALL ||
	     sdata->flags & IEEE80211_SDATA_IN_DRIVER))
624 625
		iterator(data, sdata->vif.addr, &sdata->vif);

626
	rcu_read_unlock();
627
}
628
EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic);
629

630 631 632 633 634 635 636 637 638
/*
 * 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;
642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669

	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);

670
u32 ieee802_11_parse_elems_crc(const u8 *start, size_t len, bool action,
671 672 673 674
			       struct ieee802_11_elems *elems,
			       u64 filter, u32 crc)
{
	size_t left = len;
675
	const u8 *pos = start;
676
	bool calc_crc = filter != 0;
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	DECLARE_BITMAP(seen_elems, 256);
678
	const u8 *ie;
679

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	bitmap_zero(seen_elems, 256);
681 682 683 684 685 686
	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;
688 689 690 691 692

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

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		if (elen > left) {
			elems->parse_error = true;
695
			break;
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		}

698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725
		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:
726
		case WLAN_EID_SECONDARY_CHANNEL_OFFSET:
727 728 729 730 731
		case WLAN_EID_WIDE_BW_CHANNEL_SWITCH:
		/*
		 * not listing WLAN_EID_CHANNEL_SWITCH_WRAPPER -- it seems possible
		 * that if the content gets bigger it might be needed more than once
		 */
732 733 734 735 736 737 738
			if (test_bit(id, seen_elems)) {
				elems->parse_error = true;
				left -= elen;
				pos += elen;
				continue;
			}
			break;
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		}
740 741 742 743

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

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		elem_parse_failed = false;

746 747 748 749 750 751 752 753 754 755
		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_DS_PARAMS:
756 757 758 759
			if (elen >= 1)
				elems->ds_params = pos;
			else
				elem_parse_failed = true;
760 761 762 763 764
			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;
767 768 769 770 771 772 773 774 775 776 777 778 779
			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);

780
				if (elen >= 5 && pos[3] == 2) {
781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796
					/* 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:
797 798 799 800
			if (elen >= 1)
				elems->erp_info = pos;
			else
				elem_parse_failed = true;
801 802 803 804 805 806 807 808
			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;
811
			break;
812 813 814
		case WLAN_EID_HT_OPERATION:
			if (elen >= sizeof(struct ieee80211_ht_operation))
				elems->ht_operation = (void *)pos;
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815 816
			else
				elem_parse_failed = true;
817
			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;
830 831 832 833 834 835
		case WLAN_EID_OPMODE_NOTIF:
			if (elen > 0)
				elems->opmode_notif = pos;
			else
				elem_parse_failed = true;
			break;
836 837 838 839 840 841 842
		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;
845 846 847 848 849
			break;
		case WLAN_EID_PEER_MGMT:
			elems->peering = pos;
			elems->peering_len = elen;
			break;
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Marco Porsch 已提交
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		case WLAN_EID_MESH_AWAKE_WINDOW:
			if (elen >= 2)
				elems->awake_window = (void *)pos;
			break;
854 855 856 857 858 859 860 861 862 863 864 865 866 867 868
		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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869 870
			else
				elem_parse_failed = true;
871 872
			break;
		case WLAN_EID_CHANNEL_SWITCH:
873 874 875 876 877
			if (elen != sizeof(struct ieee80211_channel_sw_ie)) {
				elem_parse_failed = true;
				break;
			}
			elems->ch_switch_ie = (void *)pos;
878
			break;
879 880 881 882 883 884 885
		case WLAN_EID_EXT_CHANSWITCH_ANN:
			if (elen != sizeof(struct ieee80211_ext_chansw_ie)) {
				elem_parse_failed = true;
				break;
			}
			elems->ext_chansw_ie = (void *)pos;
			break;
886 887 888 889 890 891 892
		case WLAN_EID_SECONDARY_CHANNEL_OFFSET:
			if (elen != sizeof(struct ieee80211_sec_chan_offs_ie)) {
				elem_parse_failed = true;
				break;
			}
			elems->sec_chan_offs = (void *)pos;
			break;
893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920
		case WLAN_EID_WIDE_BW_CHANNEL_SWITCH:
			if (!action ||
			    elen != sizeof(*elems->wide_bw_chansw_ie)) {
				elem_parse_failed = true;
				break;
			}
			elems->wide_bw_chansw_ie = (void *)pos;
			break;
		case WLAN_EID_CHANNEL_SWITCH_WRAPPER:
			if (action) {
				elem_parse_failed = true;
				break;
			}
			/*
			 * This is a bit tricky, but as we only care about
			 * the wide bandwidth channel switch element, so
			 * just parse it out manually.
			 */
			ie = cfg80211_find_ie(WLAN_EID_WIDE_BW_CHANNEL_SWITCH,
					      pos, elen);
			if (ie) {
				if (ie[1] == sizeof(*elems->wide_bw_chansw_ie))
					elems->wide_bw_chansw_ie =
						(void *)(ie + 2);
				else
					elem_parse_failed = true;
			}
			break;
921 922 923 924 925
		case WLAN_EID_COUNTRY:
			elems->country_elem = pos;
			elems->country_elem_len = elen;
			break;
		case WLAN_EID_PWR_CONSTRAINT:
926 927 928 929
			if (elen != 1) {
				elem_parse_failed = true;
				break;
			}
930 931 932
			elems->pwr_constr_elem = pos;
			break;
		case WLAN_EID_TIMEOUT_INTERVAL:
933 934 935 936
			if (elen >= sizeof(struct ieee80211_timeout_interval_ie))
				elems->timeout_int = (void *)pos;
			else
				elem_parse_failed = true;
937 938 939 940 941
			break;
		default:
			break;
		}

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942 943 944
		if (elem_parse_failed)
			elems->parse_error = true;
		else
945
			__set_bit(id, seen_elems);
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946

947 948 949 950
		left -= elen;
		pos += elen;
	}

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951 952 953
	if (left != 0)
		elems->parse_error = true;

954 955 956
	return crc;
}

957 958
void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata,
			       bool bss_notify)
959 960 961
{
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_tx_queue_params qparam;
J
Johannes Berg 已提交
962
	struct ieee80211_chanctx_conf *chanctx_conf;
963
	int ac;
964
	bool use_11b, enable_qos;
965
	int aCWmin, aCWmax;
966 967 968 969

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

970 971 972
	if (local->hw.queues < IEEE80211_NUM_ACS)
		return;

973 974
	memset(&qparam, 0, sizeof(qparam));

J
Johannes Berg 已提交
975 976 977
	rcu_read_lock();
	chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
	use_11b = (chanctx_conf &&
978
		   chanctx_conf->def.chan->band == IEEE80211_BAND_2GHZ) &&
979
		 !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE);
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Johannes Berg 已提交
980
	rcu_read_unlock();
981

982 983 984 985 986 987 988
	/*
	 * 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);

989
	for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
990 991 992 993 994 995 996
		/* Set defaults according to 802.11-2007 Table 7-37 */
		aCWmax = 1023;
		if (use_11b)
			aCWmin = 31;
		else
			aCWmin = 15;

997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033
		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. */
1034 1035
			qparam.cw_max = aCWmax;
			qparam.cw_min = aCWmin;
1036 1037 1038
			qparam.txop = 0;
			qparam.aifs = 2;
		}
1039

K
Kalle Valo 已提交
1040 1041
		qparam.uapsd = false;

1042 1043
		sdata->tx_conf[ac] = qparam;
		drv_conf_tx(local, sdata, ac, &qparam);
1044
	}
1045

1046 1047
	if (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
	    sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) {
1048
		sdata->vif.bss_conf.qos = enable_qos;
1049 1050 1051
		if (bss_notify)
			ieee80211_bss_info_change_notify(sdata,
							 BSS_CHANGED_QOS);
1052
	}
1053
}
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1055 1056 1057 1058
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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1059
	struct ieee80211_chanctx_conf *chanctx_conf;
1060 1061 1062 1063 1064 1065 1066
	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 &&
1071
	    chanctx_conf->def.chan->band == IEEE80211_BAND_2GHZ &&
1072 1073 1074 1075
	    have_higher_than_11mbit)
		sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
	else
		sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
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Johannes Berg 已提交
1076
	rcu_read_unlock();
1077

1078
	ieee80211_set_wmm_default(sdata, true);
1079 1080 1081
}

void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
1082
			 u16 transaction, u16 auth_alg, u16 status,
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1083
			 const u8 *extra, size_t extra_len, const u8 *da,
1084 1085
			 const u8 *bssid, const u8 *key, u8 key_len, u8 key_idx,
			 u32 tx_flags)
1086 1087 1088 1089
{
	struct ieee80211_local *local = sdata->local;
	struct sk_buff *skb;
	struct ieee80211_mgmt *mgmt;
J
Johannes Berg 已提交
1090
	int err;
1091 1092

	skb = dev_alloc_skb(local->hw.extra_tx_headroom +
1093
			    sizeof(*mgmt) + 6 + extra_len);
1094
	if (!skb)
1095
		return;
1096

1097 1098 1099 1100 1101 1102
	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);
1103
	memcpy(mgmt->da, da, ETH_ALEN);
1104
	memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
1105 1106 1107
	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);
1108
	mgmt->u.auth.status_code = cpu_to_le16(status);
1109 1110 1111
	if (extra)
		memcpy(skb_put(skb, extra_len), extra, extra_len);

J
Johannes Berg 已提交
1112 1113 1114 1115 1116 1117
	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);
	}

1118 1119
	IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
					tx_flags;
1120
	ieee80211_tx_skb(sdata, skb);
1121 1122
}

1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161
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);
	}
}

1162
int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer,
1163
			     size_t buffer_len, const u8 *ie, size_t ie_len,
1164 1165
			     enum ieee80211_band band, u32 rate_mask,
			     u8 channel)
1166 1167
{
	struct ieee80211_supported_band *sband;
1168
	u8 *pos = buffer, *end = buffer + buffer_len;
1169 1170
	size_t offset = 0, noffset;
	int supp_rates_len, i;
1171 1172 1173
	u8 rates[32];
	int num_rates;
	int ext_rates_len;
1174

1175
	sband = local->hw.wiphy->bands[band];
1176 1177
	if (WARN_ON_ONCE(!sband))
		return 0;
1178

1179 1180 1181 1182 1183 1184 1185 1186
	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);
1187

1188 1189
	if (end - pos < 2 + supp_rates_len)
		goto out_err;
1190
	*pos++ = WLAN_EID_SUPP_RATES;
1191
	*pos++ = supp_rates_len;
1192 1193
	memcpy(pos, rates, supp_rates_len);
	pos += supp_rates_len;
1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205

	/* 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);
1206 1207
		if (end - pos < noffset - offset)
			goto out_err;
1208 1209 1210 1211 1212
		memcpy(pos, ie + offset, noffset - offset);
		pos += noffset - offset;
		offset = noffset;
	}

1213 1214
	ext_rates_len = num_rates - supp_rates_len;
	if (ext_rates_len > 0) {
1215 1216
		if (end - pos < 2 + ext_rates_len)
			goto out_err;
1217
		*pos++ = WLAN_EID_EXT_SUPP_RATES;
1218 1219 1220
		*pos++ = ext_rates_len;
		memcpy(pos, rates + supp_rates_len, ext_rates_len);
		pos += ext_rates_len;
1221 1222
	}

1223
	if (channel && sband->band == IEEE80211_BAND_2GHZ) {
1224 1225
		if (end - pos < 3)
			goto out_err;
1226 1227 1228 1229 1230
		*pos++ = WLAN_EID_DS_PARAMS;
		*pos++ = 1;
		*pos++ = channel;
	}

1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243
	/* 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);
1244 1245
		if (end - pos < noffset - offset)
			goto out_err;
1246 1247 1248
		memcpy(pos, ie + offset, noffset - offset);
		pos += noffset - offset;
		offset = noffset;
1249 1250
	}

1251 1252 1253
	if (sband->ht_cap.ht_supported) {
		if (end - pos < 2 + sizeof(struct ieee80211_ht_cap))
			goto out_err;
B
Ben Greear 已提交
1254 1255
		pos = ieee80211_ie_build_ht_cap(pos, &sband->ht_cap,
						sband->ht_cap.cap);
1256
	}
1257

1258 1259 1260 1261 1262
	/*
	 * If adding more here, adjust code in main.c
	 * that calculates local->scan_ies_len.
	 */

1263 1264 1265
	/* add any remaining custom IEs */
	if (ie && ie_len) {
		noffset = ie_len;
1266 1267
		if (end - pos < noffset - offset)
			goto out_err;
1268 1269
		memcpy(pos, ie + offset, noffset - offset);
		pos += noffset - offset;
1270 1271
	}

1272 1273 1274
	if (sband->vht_cap.vht_supported) {
		if (end - pos < 2 + sizeof(struct ieee80211_vht_cap))
			goto out_err;
1275 1276
		pos = ieee80211_ie_build_vht_cap(pos, &sband->vht_cap,
						 sband->vht_cap.cap);
1277
	}
1278

1279 1280 1281
	return pos - buffer;
 out_err:
	WARN_ONCE(1, "not enough space for preq IEs\n");
1282 1283 1284
	return pos - buffer;
}

1285
struct sk_buff *ieee80211_build_probe_req(struct ieee80211_sub_if_data *sdata,
1286
					  u8 *dst, u32 ratemask,
1287
					  struct ieee80211_channel *chan,
1288
					  const u8 *ssid, size_t ssid_len,
1289 1290
					  const u8 *ie, size_t ie_len,
					  bool directed)
1291 1292 1293 1294
{
	struct ieee80211_local *local = sdata->local;
	struct sk_buff *skb;
	struct ieee80211_mgmt *mgmt;
1295
	u8 chan_no;
1296
	int ies_len;
1297

1298 1299 1300 1301 1302 1303
	/*
	 * 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)
1304
		chan_no = 0;
1305
	else
1306
		chan_no = ieee80211_frequency_to_channel(chan->center_freq);
1307

1308
	skb = ieee80211_probereq_get(&local->hw, &sdata->vif,
1309
				     ssid, ssid_len, 100 + ie_len);
1310
	if (!skb)
1311 1312 1313 1314 1315 1316 1317
		return NULL;

	ies_len = ieee80211_build_preq_ies(local, skb_tail_pointer(skb),
					   skb_tailroom(skb),
					   ie, ie_len, chan->band,
					   ratemask, chan_no);
	skb_put(skb, ies_len);
1318

1319
	if (dst) {
1320
		mgmt = (struct ieee80211_mgmt *) skb->data;
1321 1322 1323 1324
		memcpy(mgmt->da, dst, ETH_ALEN);
		memcpy(mgmt->bssid, dst, ETH_ALEN);
	}

1325
	IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1326

1327 1328 1329 1330 1331
	return skb;
}

void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
			      const u8 *ssid, size_t ssid_len,
1332
			      const u8 *ie, size_t ie_len,
1333
			      u32 ratemask, bool directed, u32 tx_flags,
J
Johannes Berg 已提交
1334
			      struct ieee80211_channel *channel, bool scan)
1335 1336 1337
{
	struct sk_buff *skb;

1338
	skb = ieee80211_build_probe_req(sdata, dst, ratemask, channel,
1339
					ssid, ssid_len,
1340
					ie, ie_len, directed);
1341
	if (skb) {
1342
		IEEE80211_SKB_CB(skb)->flags |= tx_flags;
J
Johannes Berg 已提交
1343 1344 1345 1346
		if (scan)
			ieee80211_tx_skb_tid_band(sdata, skb, 7, channel->band);
		else
			ieee80211_tx_skb(sdata, skb);
1347
	}
1348 1349 1350 1351
}

u32 ieee80211_sta_get_rates(struct ieee80211_local *local,
			    struct ieee802_11_elems *elems,
1352
			    enum ieee80211_band band, u32 *basic_rates)
1353 1354 1355 1356 1357 1358 1359 1360
{
	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];

1361 1362
	if (WARN_ON(!sband))
		return 1;
1363 1364 1365 1366 1367 1368 1369 1370

	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;
1371
		bool is_basic;
1372 1373 1374 1375 1376 1377
		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);
1378 1379 1380 1381 1382 1383 1384
		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) {
1385
				supp_rates |= BIT(j);
1386 1387 1388 1389
				if (basic_rates && is_basic)
					*basic_rates |= BIT(j);
			}
		}
1390 1391 1392
	}
	return supp_rates;
}
1393

1394 1395 1396
void ieee80211_stop_device(struct ieee80211_local *local)
{
	ieee80211_led_radio(local, false);
1397
	ieee80211_mod_tpt_led_trig(local, 0, IEEE80211_TPT_LEDTRIG_FL_RADIO);
1398 1399 1400 1401

	cancel_work_sync(&local->reconfig_filter);

	flush_workqueue(local->workqueue);
1402
	drv_stop(local);
1403 1404
}

1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423
static void ieee80211_assign_chanctx(struct ieee80211_local *local,
				     struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_chanctx_conf *conf;
	struct ieee80211_chanctx *ctx;

	if (!local->use_chanctx)
		return;

	mutex_lock(&local->chanctx_mtx);
	conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
					 lockdep_is_held(&local->chanctx_mtx));
	if (conf) {
		ctx = container_of(conf, struct ieee80211_chanctx, conf);
		drv_assign_vif_chanctx(local, sdata, ctx);
	}
	mutex_unlock(&local->chanctx_mtx);
}

1424 1425 1426 1427
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
1428
	struct ieee80211_chanctx *ctx;
1429
	struct sta_info *sta;
1430
	int res, i;
J
Johannes Berg 已提交
1431 1432
	bool reconfig_due_to_wowlan = false;

1433
#ifdef CONFIG_PM
J
Johannes Berg 已提交
1434 1435
	if (local->suspended)
		local->resuming = true;
1436

1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450
	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.
		 */
J
Johannes Berg 已提交
1451
		reconfig_due_to_wowlan = true;
1452 1453
	}
#endif
1454 1455 1456
	/* everything else happens only if HW was up & running */
	if (!local->open_count)
		goto wake_up;
1457

1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469
	/*
	 * 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;
1470 1471
	}

1472 1473 1474 1475 1476 1477 1478 1479 1480
	/* 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);

1481 1482 1483 1484
	ieee80211_led_radio(local, true);
	ieee80211_mod_tpt_led_trig(local,
				   IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);

1485
	/* add interfaces */
1486 1487
	sdata = rtnl_dereference(local->monitor_sdata);
	if (sdata) {
1488 1489
		/* in HW restart it exists already */
		WARN_ON(local->resuming);
1490 1491 1492 1493 1494 1495 1496 1497
		res = drv_add_interface(local, sdata);
		if (WARN_ON(res)) {
			rcu_assign_pointer(local->monitor_sdata, NULL);
			synchronize_net();
			kfree(sdata);
		}
	}

1498 1499 1500
	list_for_each_entry(sdata, &local->interfaces, list) {
		if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
		    sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1501
		    ieee80211_sdata_running(sdata))
1502
			res = drv_add_interface(local, sdata);
1503 1504
	}

J
Johannes Berg 已提交
1505
	/* add channel contexts */
1506 1507 1508 1509 1510 1511
	if (local->use_chanctx) {
		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);
	}
J
Johannes Berg 已提交
1512

1513 1514 1515
	list_for_each_entry(sdata, &local->interfaces, list) {
		if (!ieee80211_sdata_running(sdata))
			continue;
1516
		ieee80211_assign_chanctx(local, sdata);
1517 1518
	}

1519
	sdata = rtnl_dereference(local->monitor_sdata);
1520 1521
	if (sdata && ieee80211_sdata_running(sdata))
		ieee80211_assign_chanctx(local, sdata);
1522

1523
	/* add STAs back */
1524 1525
	mutex_lock(&local->sta_mtx);
	list_for_each_entry(sta, &local->sta_list, list) {
1526
		enum ieee80211_sta_state state;
J
Johannes Berg 已提交
1527

1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538
		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));
1539
	}
1540
	mutex_unlock(&local->sta_mtx);
1541

1542
	/* reconfigure tx conf */
1543 1544 1545 1546 1547 1548
	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;
1549

1550 1551 1552 1553
			for (i = 0; i < IEEE80211_NUM_ACS; i++)
				drv_conf_tx(local, sdata, i,
					    &sdata->tx_conf[i]);
		}
1554
	}
1555

1556 1557 1558 1559 1560 1561 1562
	/* 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) {
1563 1564
		u32 changed;

1565
		if (!ieee80211_sdata_running(sdata))
1566
			continue;
1567 1568 1569 1570 1571 1572 1573 1574 1575

		/* 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 |
1576
			  BSS_CHANGED_CQM |
1577
			  BSS_CHANGED_QOS |
1578 1579
			  BSS_CHANGED_IDLE |
			  BSS_CHANGED_TXPOWER;
1580

1581 1582
		switch (sdata->vif.type) {
		case NL80211_IFTYPE_STATION:
1583
			changed |= BSS_CHANGED_ASSOC |
E
Eliad Peller 已提交
1584 1585
				   BSS_CHANGED_ARP_FILTER |
				   BSS_CHANGED_PS;
1586

1587 1588 1589
			/* Re-send beacon info report to the driver */
			if (sdata->u.mgd.have_beacon)
				changed |= BSS_CHANGED_BEACON_INFO;
1590

1591
			sdata_lock(sdata);
1592
			ieee80211_bss_info_change_notify(sdata, changed);
1593
			sdata_unlock(sdata);
1594
			break;
1595
		case NL80211_IFTYPE_ADHOC:
1596 1597
			changed |= BSS_CHANGED_IBSS;
			/* fall through */
1598
		case NL80211_IFTYPE_AP:
1599
			changed |= BSS_CHANGED_SSID | BSS_CHANGED_P2P_PS;
1600

1601
			if (sdata->vif.type == NL80211_IFTYPE_AP) {
1602 1603
				changed |= BSS_CHANGED_AP_PROBE_RESP;

1604 1605 1606 1607
				if (rcu_access_pointer(sdata->u.ap.beacon))
					drv_start_ap(local, sdata);
			}

1608
			/* fall through */
1609
		case NL80211_IFTYPE_MESH_POINT:
1610 1611 1612 1613 1614
			if (sdata->vif.bss_conf.enable_beacon) {
				changed |= BSS_CHANGED_BEACON |
					   BSS_CHANGED_BEACON_ENABLED;
				ieee80211_bss_info_change_notify(sdata, changed);
			}
1615 1616 1617 1618 1619 1620 1621
			break;
		case NL80211_IFTYPE_WDS:
			break;
		case NL80211_IFTYPE_AP_VLAN:
		case NL80211_IFTYPE_MONITOR:
			/* ignore virtual */
			break;
1622
		case NL80211_IFTYPE_P2P_DEVICE:
1623 1624
			changed = BSS_CHANGED_IDLE;
			break;
1625
		case NL80211_IFTYPE_UNSPECIFIED:
1626
		case NUM_NL80211_IFTYPES:
1627 1628
		case NL80211_IFTYPE_P2P_CLIENT:
		case NL80211_IFTYPE_P2P_GO:
1629 1630 1631 1632 1633
			WARN_ON(1);
			break;
		}
	}

1634 1635
	ieee80211_recalc_ps(local, -1);

1636 1637 1638 1639 1640 1641 1642 1643 1644 1645
	/*
	 * 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;
1646 1647
			if (!sdata->u.mgd.associated)
				continue;
1648 1649 1650 1651 1652

			ieee80211_send_nullfunc(local, sdata, 0);
		}
	}

1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670
	/* 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);

1671 1672 1673 1674 1675
	/* add back keys */
	list_for_each_entry(sdata, &local->interfaces, list)
		if (ieee80211_sdata_running(sdata))
			ieee80211_enable_keys(sdata);

1676
 wake_up:
1677 1678 1679
	local->in_reconfig = false;
	barrier();

1680 1681 1682
	if (local->monitors == local->open_count && local->monitors > 0)
		ieee80211_add_virtual_monitor(local);

1683 1684 1685 1686 1687 1688 1689 1690 1691 1692
	/*
	 * 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.
	 */
1693
	if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
1694 1695 1696
		mutex_lock(&local->sta_mtx);

		list_for_each_entry(sta, &local->sta_list, list) {
1697 1698
			ieee80211_sta_tear_down_BA_sessions(
					sta, AGG_STOP_LOCAL_REQUEST);
J
Johannes Berg 已提交
1699
			clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
1700
		}
1701 1702

		mutex_unlock(&local->sta_mtx);
1703 1704
	}

1705 1706
	ieee80211_wake_queues_by_reason(hw, IEEE80211_MAX_QUEUE_MAP,
					IEEE80211_QUEUE_STOP_REASON_SUSPEND);
1707

1708 1709 1710 1711
	/*
	 * If this is for hw restart things are still running.
	 * We may want to change that later, however.
	 */
1712
	if (!local->suspended || reconfig_due_to_wowlan)
1713
		drv_restart_complete(local);
1714 1715

	if (!local->suspended)
1716 1717 1718
		return 0;

#ifdef CONFIG_PM
J
Johannes Berg 已提交
1719
	/* first set suspended false, then resuming */
1720
	local->suspended = false;
J
Johannes Berg 已提交
1721 1722
	mb();
	local->resuming = false;
1723

1724 1725 1726 1727 1728 1729 1730
	list_for_each_entry(sdata, &local->interfaces, list) {
		if (!ieee80211_sdata_running(sdata))
			continue;
		if (sdata->vif.type == NL80211_IFTYPE_STATION)
			ieee80211_sta_restart(sdata);
	}

1731
	mod_timer(&local->sta_cleanup, jiffies + 1);
1732 1733 1734
#else
	WARN_ON(1);
#endif
1735 1736
	return 0;
}
1737

1738 1739 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
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);

1765
void ieee80211_recalc_smps(struct ieee80211_sub_if_data *sdata)
1766
{
1767 1768 1769
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_chanctx_conf *chanctx_conf;
	struct ieee80211_chanctx *chanctx;
1770

1771
	mutex_lock(&local->chanctx_mtx);
1772

1773 1774
	chanctx_conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
					lockdep_is_held(&local->chanctx_mtx));
1775

1776
	if (WARN_ON_ONCE(!chanctx_conf))
1777
		goto unlock;
1778

1779 1780
	chanctx = container_of(chanctx_conf, struct ieee80211_chanctx, conf);
	ieee80211_recalc_smps_chanctx(local, chanctx);
1781
 unlock:
1782
	mutex_unlock(&local->chanctx_mtx);
1783
}
1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839

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;
}
1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879

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);
1880

B
Ben Greear 已提交
1881
u8 *ieee80211_ie_build_ht_cap(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap,
1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895
			      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
1896 1897
	*pos++ = ht_cap->ampdu_factor |
		 (ht_cap->ampdu_density <<
1898 1899 1900
			IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT);

	/* MCS set */
B
Ben Greear 已提交
1901 1902
	memcpy(pos, &ht_cap->mcs, sizeof(ht_cap->mcs));
	pos += sizeof(ht_cap->mcs);
1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915

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

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

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

	return pos;
}

1916
u8 *ieee80211_ie_build_vht_cap(u8 *pos, struct ieee80211_sta_vht_cap *vht_cap,
1917
			       u32 cap)
1918 1919 1920 1921
{
	__le32 tmp;

	*pos++ = WLAN_EID_VHT_CAPABILITY;
M
Mahesh Palivela 已提交
1922 1923
	*pos++ = sizeof(struct ieee80211_vht_cap);
	memset(pos, 0, sizeof(struct ieee80211_vht_cap));
1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936

	/* 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;
}

1937
u8 *ieee80211_ie_build_ht_oper(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap,
1938
			       const struct cfg80211_chan_def *chandef,
1939
			       u16 prot_mode)
1940
{
1941
	struct ieee80211_ht_operation *ht_oper;
1942
	/* Build HT Information */
1943 1944 1945
	*pos++ = WLAN_EID_HT_OPERATION;
	*pos++ = sizeof(struct ieee80211_ht_operation);
	ht_oper = (struct ieee80211_ht_operation *)pos;
1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956
	ht_oper->primary_chan = ieee80211_frequency_to_channel(
					chandef->chan->center_freq);
	switch (chandef->width) {
	case NL80211_CHAN_WIDTH_160:
	case NL80211_CHAN_WIDTH_80P80:
	case NL80211_CHAN_WIDTH_80:
	case NL80211_CHAN_WIDTH_40:
		if (chandef->center_freq1 > chandef->chan->center_freq)
			ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
		else
			ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_BELOW;
1957 1958
		break;
	default:
1959
		ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_NONE;
1960 1961
		break;
	}
1962
	if (ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 &&
1963 1964
	    chandef->width != NL80211_CHAN_WIDTH_20_NOHT &&
	    chandef->width != NL80211_CHAN_WIDTH_20)
1965
		ht_oper->ht_param |= IEEE80211_HT_PARAM_CHAN_WIDTH_ANY;
1966

1967
	ht_oper->operation_mode = cpu_to_le16(prot_mode);
1968
	ht_oper->stbc_param = 0x0000;
1969 1970 1971

	/* It seems that Basic MCS set and Supported MCS set
	   are identical for the first 10 bytes */
1972 1973
	memset(&ht_oper->basic_set, 0, 16);
	memcpy(&ht_oper->basic_set, &ht_cap->mcs, 10);
1974

1975
	return pos + sizeof(struct ieee80211_ht_operation);
1976 1977
}

1978
void ieee80211_ht_oper_to_chandef(struct ieee80211_channel *control_chan,
J
Johannes Berg 已提交
1979
				  const struct ieee80211_ht_operation *ht_oper,
1980
				  struct cfg80211_chan_def *chandef)
1981 1982 1983
{
	enum nl80211_channel_type channel_type;

1984 1985 1986 1987 1988
	if (!ht_oper) {
		cfg80211_chandef_create(chandef, control_chan,
					NL80211_CHAN_NO_HT);
		return;
	}
1989

1990
	switch (ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003
	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;
	}

2004
	cfg80211_chandef_create(chandef, control_chan, channel_type);
2005 2006
}

2007
int ieee80211_add_srates_ie(struct ieee80211_sub_if_data *sdata,
2008 2009
			    struct sk_buff *skb, bool need_basic,
			    enum ieee80211_band band)
2010 2011 2012 2013 2014
{
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_supported_band *sband;
	int rate;
	u8 i, rates, *pos;
2015
	u32 basic_rates = sdata->vif.bss_conf.basic_rates;
2016

2017
	sband = local->hw.wiphy->bands[band];
2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028
	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++) {
2029 2030 2031
		u8 basic = 0;
		if (need_basic && basic_rates & BIT(i))
			basic = 0x80;
2032
		rate = sband->bitrates[i].bitrate;
2033
		*pos++ = basic | (u8) (rate / 5);
2034 2035 2036 2037 2038
	}

	return 0;
}

2039
int ieee80211_add_ext_srates_ie(struct ieee80211_sub_if_data *sdata,
2040 2041
				struct sk_buff *skb, bool need_basic,
				enum ieee80211_band band)
2042 2043 2044 2045 2046
{
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_supported_band *sband;
	int rate;
	u8 i, exrates, *pos;
2047
	u32 basic_rates = sdata->vif.bss_conf.basic_rates;
2048

2049
	sband = local->hw.wiphy->bands[band];
2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063
	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++) {
2064 2065 2066
			u8 basic = 0;
			if (need_basic && basic_rates & BIT(i))
				basic = 0x80;
2067
			rate = sband->bitrates[i].bitrate;
2068
			*pos++ = basic | (u8) (rate / 5);
2069 2070 2071 2072
		}
	}
	return 0;
}
2073 2074 2075 2076 2077 2078

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;

2079 2080 2081 2082
	if (WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_STATION)) {
		/* non-managed type inferfaces */
		return 0;
	}
2083
	return ifmgd->ave_beacon_signal / 16;
2084
}
2085
EXPORT_SYMBOL_GPL(ieee80211_ave_rssi);
2086 2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101

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;
}
2102 2103 2104 2105 2106 2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119 2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135

/**
 * ieee80211_calculate_rx_timestamp - calculate timestamp in frame
 * @local: mac80211 hw info struct
 * @status: RX status
 * @mpdu_len: total MPDU length (including FCS)
 * @mpdu_offset: offset into MPDU to calculate timestamp at
 *
 * This function calculates the RX timestamp at the given MPDU offset, taking
 * into account what the RX timestamp was. An offset of 0 will just normalize
 * the timestamp to TSF at beginning of MPDU reception.
 */
u64 ieee80211_calculate_rx_timestamp(struct ieee80211_local *local,
				     struct ieee80211_rx_status *status,
				     unsigned int mpdu_len,
				     unsigned int mpdu_offset)
{
	u64 ts = status->mactime;
	struct rate_info ri;
	u16 rate;

	if (WARN_ON(!ieee80211_have_rx_timestamp(status)))
		return 0;

	memset(&ri, 0, sizeof(ri));

	/* Fill cfg80211 rate info */
	if (status->flag & RX_FLAG_HT) {
		ri.mcs = status->rate_idx;
		ri.flags |= RATE_INFO_FLAGS_MCS;
		if (status->flag & RX_FLAG_40MHZ)
			ri.flags |= RATE_INFO_FLAGS_40_MHZ_WIDTH;
		if (status->flag & RX_FLAG_SHORT_GI)
			ri.flags |= RATE_INFO_FLAGS_SHORT_GI;
2136 2137 2138 2139 2140 2141 2142 2143 2144 2145 2146 2147 2148 2149
	} else if (status->flag & RX_FLAG_VHT) {
		ri.flags |= RATE_INFO_FLAGS_VHT_MCS;
		ri.mcs = status->rate_idx;
		ri.nss = status->vht_nss;
		if (status->flag & RX_FLAG_40MHZ)
			ri.flags |= RATE_INFO_FLAGS_40_MHZ_WIDTH;
		if (status->flag & RX_FLAG_80MHZ)
			ri.flags |= RATE_INFO_FLAGS_80_MHZ_WIDTH;
		if (status->flag & RX_FLAG_80P80MHZ)
			ri.flags |= RATE_INFO_FLAGS_80P80_MHZ_WIDTH;
		if (status->flag & RX_FLAG_160MHZ)
			ri.flags |= RATE_INFO_FLAGS_160_MHZ_WIDTH;
		if (status->flag & RX_FLAG_SHORT_GI)
			ri.flags |= RATE_INFO_FLAGS_SHORT_GI;
2150 2151 2152 2153 2154 2155 2156 2157 2158 2159 2160 2161 2162 2163 2164 2165 2166
	} else {
		struct ieee80211_supported_band *sband;

		sband = local->hw.wiphy->bands[status->band];
		ri.legacy = sband->bitrates[status->rate_idx].bitrate;
	}

	rate = cfg80211_calculate_bitrate(&ri);

	/* rewind from end of MPDU */
	if (status->flag & RX_FLAG_MACTIME_END)
		ts -= mpdu_len * 8 * 10 / rate;

	ts += mpdu_offset * 8 * 10 / rate;

	return ts;
}
2167 2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 2178 2179 2180 2181 2182 2183 2184 2185 2186 2187 2188 2189 2190 2191 2192 2193 2194 2195 2196 2197

void ieee80211_dfs_cac_cancel(struct ieee80211_local *local)
{
	struct ieee80211_sub_if_data *sdata;

	mutex_lock(&local->iflist_mtx);
	list_for_each_entry(sdata, &local->interfaces, list) {
		cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);

		if (sdata->wdev.cac_started) {
			ieee80211_vif_release_channel(sdata);
			cfg80211_cac_event(sdata->dev,
					   NL80211_RADAR_CAC_ABORTED,
					   GFP_KERNEL);
		}
	}
	mutex_unlock(&local->iflist_mtx);
}

void ieee80211_dfs_radar_detected_work(struct work_struct *work)
{
	struct ieee80211_local *local =
		container_of(work, struct ieee80211_local, radar_detected_work);
	struct cfg80211_chan_def chandef;

	ieee80211_dfs_cac_cancel(local);

	if (local->use_chanctx)
		/* currently not handled */
		WARN_ON(1);
	else {
2198
		chandef = local->hw.conf.chandef;
2199 2200 2201 2202 2203 2204 2205 2206 2207 2208 2209 2210 2211
		cfg80211_radar_event(local->hw.wiphy, &chandef, GFP_KERNEL);
	}
}

void ieee80211_radar_detected(struct ieee80211_hw *hw)
{
	struct ieee80211_local *local = hw_to_local(hw);

	trace_api_radar_detected(local);

	ieee80211_queue_work(hw, &local->radar_detected_work);
}
EXPORT_SYMBOL(ieee80211_radar_detected);