tx.c 83.2 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>
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 * Copyright 2013-2014  Intel Mobile Communications GmbH
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 *
 * 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.
 *
 *
 * Transmit and frame generation functions.
 */

#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/skbuff.h>
#include <linux/etherdevice.h>
#include <linux/bitmap.h>
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#include <linux/rcupdate.h>
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#include <linux/export.h>
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#include <linux/time.h>
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#include <net/net_namespace.h>
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#include <net/ieee80211_radiotap.h>
#include <net/cfg80211.h>
#include <net/mac80211.h>
#include <asm/unaligned.h>

#include "ieee80211_i.h"
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#include "driver-ops.h"
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#include "led.h"
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#include "mesh.h"
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#include "wep.h"
#include "wpa.h"
#include "wme.h"
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#include "rate.h"
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/* misc utils */

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static __le16 ieee80211_duration(struct ieee80211_tx_data *tx,
				 struct sk_buff *skb, int group_addr,
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				 int next_frag_len)
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{
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	int rate, mrate, erp, dur, i, shift = 0;
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	struct ieee80211_rate *txrate;
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	struct ieee80211_local *local = tx->local;
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	struct ieee80211_supported_band *sband;
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	struct ieee80211_hdr *hdr;
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	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
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	struct ieee80211_chanctx_conf *chanctx_conf;
	u32 rate_flags = 0;

	rcu_read_lock();
	chanctx_conf = rcu_dereference(tx->sdata->vif.chanctx_conf);
	if (chanctx_conf) {
		shift = ieee80211_chandef_get_shift(&chanctx_conf->def);
		rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
	}
	rcu_read_unlock();
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	/* assume HW handles this */
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	if (tx->rate.flags & IEEE80211_TX_RC_MCS)
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		return 0;

	/* uh huh? */
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	if (WARN_ON_ONCE(tx->rate.idx < 0))
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		return 0;
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	sband = local->hw.wiphy->bands[info->band];
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	txrate = &sband->bitrates[tx->rate.idx];
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	erp = txrate->flags & IEEE80211_RATE_ERP_G;
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	/*
	 * data and mgmt (except PS Poll):
	 * - during CFP: 32768
	 * - during contention period:
	 *   if addr1 is group address: 0
	 *   if more fragments = 0 and addr1 is individual address: time to
	 *      transmit one ACK plus SIFS
	 *   if more fragments = 1 and addr1 is individual address: time to
	 *      transmit next fragment plus 2 x ACK plus 3 x SIFS
	 *
	 * IEEE 802.11, 9.6:
	 * - control response frame (CTS or ACK) shall be transmitted using the
	 *   same rate as the immediately previous frame in the frame exchange
	 *   sequence, if this rate belongs to the PHY mandatory rates, or else
	 *   at the highest possible rate belonging to the PHY rates in the
	 *   BSSBasicRateSet
	 */
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	hdr = (struct ieee80211_hdr *)skb->data;
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	if (ieee80211_is_ctl(hdr->frame_control)) {
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		/* TODO: These control frames are not currently sent by
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		 * mac80211, but should they be implemented, this function
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		 * needs to be updated to support duration field calculation.
		 *
		 * RTS: time needed to transmit pending data/mgmt frame plus
		 *    one CTS frame plus one ACK frame plus 3 x SIFS
		 * CTS: duration of immediately previous RTS minus time
		 *    required to transmit CTS and its SIFS
		 * ACK: 0 if immediately previous directed data/mgmt had
		 *    more=0, with more=1 duration in ACK frame is duration
		 *    from previous frame minus time needed to transmit ACK
		 *    and its SIFS
		 * PS Poll: BIT(15) | BIT(14) | aid
		 */
		return 0;
	}

	/* data/mgmt */
	if (0 /* FIX: data/mgmt during CFP */)
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		return cpu_to_le16(32768);
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	if (group_addr) /* Group address as the destination - no ACK */
		return 0;

	/* Individual destination address:
	 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
	 * CTS and ACK frames shall be transmitted using the highest rate in
	 * basic rate set that is less than or equal to the rate of the
	 * immediately previous frame and that is using the same modulation
	 * (CCK or OFDM). If no basic rate set matches with these requirements,
	 * the highest mandatory rate of the PHY that is less than or equal to
	 * the rate of the previous frame is used.
	 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
	 */
	rate = -1;
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	/* use lowest available if everything fails */
	mrate = sband->bitrates[0].bitrate;
	for (i = 0; i < sband->n_bitrates; i++) {
		struct ieee80211_rate *r = &sband->bitrates[i];
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		if (r->bitrate > txrate->bitrate)
			break;
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		if ((rate_flags & r->flags) != rate_flags)
			continue;

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		if (tx->sdata->vif.bss_conf.basic_rates & BIT(i))
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			rate = DIV_ROUND_UP(r->bitrate, 1 << shift);
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		switch (sband->band) {
		case IEEE80211_BAND_2GHZ: {
			u32 flag;
			if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
				flag = IEEE80211_RATE_MANDATORY_G;
			else
				flag = IEEE80211_RATE_MANDATORY_B;
			if (r->flags & flag)
				mrate = r->bitrate;
			break;
		}
		case IEEE80211_BAND_5GHZ:
			if (r->flags & IEEE80211_RATE_MANDATORY_A)
				mrate = r->bitrate;
			break;
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		case IEEE80211_BAND_60GHZ:
			/* TODO, for now fall through */
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		case IEEE80211_NUM_BANDS:
			WARN_ON(1);
			break;
		}
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	}
	if (rate == -1) {
		/* No matching basic rate found; use highest suitable mandatory
		 * PHY rate */
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		rate = DIV_ROUND_UP(mrate, 1 << shift);
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	}

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	/* Don't calculate ACKs for QoS Frames with NoAck Policy set */
	if (ieee80211_is_data_qos(hdr->frame_control) &&
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	    *(ieee80211_get_qos_ctl(hdr)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK)
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		dur = 0;
	else
		/* Time needed to transmit ACK
		 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
		 * to closest integer */
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		dur = ieee80211_frame_duration(sband->band, 10, rate, erp,
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				tx->sdata->vif.bss_conf.use_short_preamble,
				shift);
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	if (next_frag_len) {
		/* Frame is fragmented: duration increases with time needed to
		 * transmit next fragment plus ACK and 2 x SIFS. */
		dur *= 2; /* ACK + SIFS */
		/* next fragment */
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		dur += ieee80211_frame_duration(sband->band, next_frag_len,
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				txrate->bitrate, erp,
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				tx->sdata->vif.bss_conf.use_short_preamble,
				shift);
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	}

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	return cpu_to_le16(dur);
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}

/* tx handlers */
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static ieee80211_tx_result debug_noinline
ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx)
{
	struct ieee80211_local *local = tx->local;
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	struct ieee80211_if_managed *ifmgd;
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	/* driver doesn't support power save */
	if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS))
		return TX_CONTINUE;

	/* hardware does dynamic power save */
	if (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)
		return TX_CONTINUE;

	/* dynamic power save disabled */
	if (local->hw.conf.dynamic_ps_timeout <= 0)
		return TX_CONTINUE;

	/* we are scanning, don't enable power save */
	if (local->scanning)
		return TX_CONTINUE;

	if (!local->ps_sdata)
		return TX_CONTINUE;

	/* No point if we're going to suspend */
	if (local->quiescing)
		return TX_CONTINUE;

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	/* dynamic ps is supported only in managed mode */
	if (tx->sdata->vif.type != NL80211_IFTYPE_STATION)
		return TX_CONTINUE;

	ifmgd = &tx->sdata->u.mgd;

	/*
	 * Don't wakeup from power save if u-apsd is enabled, voip ac has
	 * u-apsd enabled and the frame is in voip class. This effectively
	 * means that even if all access categories have u-apsd enabled, in
	 * practise u-apsd is only used with the voip ac. This is a
	 * workaround for the case when received voip class packets do not
	 * have correct qos tag for some reason, due the network or the
	 * peer application.
	 *
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	 * Note: ifmgd->uapsd_queues access is racy here. If the value is
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	 * changed via debugfs, user needs to reassociate manually to have
	 * everything in sync.
	 */
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	if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) &&
	    (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) &&
	    skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO)
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		return TX_CONTINUE;

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	if (local->hw.conf.flags & IEEE80211_CONF_PS) {
		ieee80211_stop_queues_by_reason(&local->hw,
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						IEEE80211_MAX_QUEUE_MAP,
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						IEEE80211_QUEUE_STOP_REASON_PS,
						false);
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		ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
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		ieee80211_queue_work(&local->hw,
				     &local->dynamic_ps_disable_work);
	}

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	/* Don't restart the timer if we're not disassociated */
	if (!ifmgd->associated)
		return TX_CONTINUE;

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	mod_timer(&local->dynamic_ps_timer, jiffies +
		  msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));

	return TX_CONTINUE;
}
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static ieee80211_tx_result debug_noinline
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ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx)
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{
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	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
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	bool assoc = false;
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	if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED))
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		return TX_CONTINUE;
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	if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) &&
	    test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) &&
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	    !ieee80211_is_probe_req(hdr->frame_control) &&
	    !ieee80211_is_nullfunc(hdr->frame_control))
		/*
		 * When software scanning only nullfunc frames (to notify
		 * the sleep state to the AP) and probe requests (for the
		 * active scan) are allowed, all other frames should not be
		 * sent and we should not get here, but if we do
		 * nonetheless, drop them to avoid sending them
		 * off-channel. See the link below and
		 * ieee80211_start_scan() for more.
		 *
		 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089
		 */
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		return TX_DROP;
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	if (tx->sdata->vif.type == NL80211_IFTYPE_WDS)
		return TX_CONTINUE;

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	if (tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
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		return TX_CONTINUE;

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	if (tx->flags & IEEE80211_TX_PS_BUFFERED)
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		return TX_CONTINUE;
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	if (tx->sta)
		assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
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	if (likely(tx->flags & IEEE80211_TX_UNICAST)) {
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		if (unlikely(!assoc &&
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			     ieee80211_is_data(hdr->frame_control))) {
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#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
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			sdata_info(tx->sdata,
				   "dropped data frame to not associated station %pM\n",
				   hdr->addr1);
#endif
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			I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
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			return TX_DROP;
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		}
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	} else if (unlikely(tx->sdata->vif.type == NL80211_IFTYPE_AP &&
			    ieee80211_is_data(hdr->frame_control) &&
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			    !atomic_read(&tx->sdata->u.ap.num_mcast_sta))) {
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		/*
		 * No associated STAs - no need to send multicast
		 * frames.
		 */
		return TX_DROP;
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	}

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	return TX_CONTINUE;
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}

/* This function is called whenever the AP is about to exceed the maximum limit
 * of buffered frames for power saving STAs. This situation should not really
 * happen often during normal operation, so dropping the oldest buffered packet
 * from each queue should be OK to make some room for new frames. */
static void purge_old_ps_buffers(struct ieee80211_local *local)
{
	int total = 0, purged = 0;
	struct sk_buff *skb;
	struct ieee80211_sub_if_data *sdata;
	struct sta_info *sta;

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	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
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		struct ps_data *ps;

		if (sdata->vif.type == NL80211_IFTYPE_AP)
			ps = &sdata->u.ap.ps;
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		else if (ieee80211_vif_is_mesh(&sdata->vif))
			ps = &sdata->u.mesh.ps;
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		else
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			continue;
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		skb = skb_dequeue(&ps->bc_buf);
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		if (skb) {
			purged++;
			dev_kfree_skb(skb);
		}
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		total += skb_queue_len(&ps->bc_buf);
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	}

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	/*
	 * Drop one frame from each station from the lowest-priority
	 * AC that has frames at all.
	 */
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	list_for_each_entry_rcu(sta, &local->sta_list, list) {
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		int ac;

		for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) {
			skb = skb_dequeue(&sta->ps_tx_buf[ac]);
			total += skb_queue_len(&sta->ps_tx_buf[ac]);
			if (skb) {
				purged++;
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				ieee80211_free_txskb(&local->hw, skb);
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				break;
			}
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		}
	}
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	local->total_ps_buffered = total;
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	ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged);
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}

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static ieee80211_tx_result
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ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx)
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{
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	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
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	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
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	struct ps_data *ps;
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	/*
	 * broadcast/multicast frame
	 *
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	 * If any of the associated/peer stations is in power save mode,
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	 * the frame is buffered to be sent after DTIM beacon frame.
	 * This is done either by the hardware or us.
	 */

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	/* powersaving STAs currently only in AP/VLAN/mesh mode */
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	if (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
	    tx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
		if (!tx->sdata->bss)
			return TX_CONTINUE;

		ps = &tx->sdata->bss->ps;
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	} else if (ieee80211_vif_is_mesh(&tx->sdata->vif)) {
		ps = &tx->sdata->u.mesh.ps;
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	} else {
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		return TX_CONTINUE;
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	}

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	/* no buffering for ordered frames */
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	if (ieee80211_has_order(hdr->frame_control))
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		return TX_CONTINUE;
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	if (ieee80211_is_probe_req(hdr->frame_control))
		return TX_CONTINUE;

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	if (tx->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
		info->hw_queue = tx->sdata->vif.cab_queue;

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	/* no stations in PS mode */
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	if (!atomic_read(&ps->num_sta_ps))
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		return TX_CONTINUE;
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	info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM;
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	/* device releases frame after DTIM beacon */
	if (!(tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING))
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		return TX_CONTINUE;

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	/* buffered in mac80211 */
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	if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
		purge_old_ps_buffers(tx->local);

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	if (skb_queue_len(&ps->bc_buf) >= AP_MAX_BC_BUFFER) {
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		ps_dbg(tx->sdata,
		       "BC TX buffer full - dropping the oldest frame\n");
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		dev_kfree_skb(skb_dequeue(&ps->bc_buf));
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	} else
		tx->local->total_ps_buffered++;
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	skb_queue_tail(&ps->bc_buf, tx->skb);
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	return TX_QUEUED;
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}

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static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta,
			     struct sk_buff *skb)
{
	if (!ieee80211_is_mgmt(fc))
		return 0;

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	if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP))
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		return 0;

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	if (!ieee80211_is_robust_mgmt_frame(skb))
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		return 0;

	return 1;
}

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static ieee80211_tx_result
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ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx)
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{
	struct sta_info *sta = tx->sta;
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	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
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	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
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	struct ieee80211_local *local = tx->local;
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	if (unlikely(!sta))
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		return TX_CONTINUE;
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	if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) ||
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		      test_sta_flag(sta, WLAN_STA_PS_DRIVER) ||
		      test_sta_flag(sta, WLAN_STA_PS_DELIVER)) &&
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		     !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) {
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		int ac = skb_get_queue_mapping(tx->skb);

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		if (ieee80211_is_mgmt(hdr->frame_control) &&
		    !ieee80211_is_bufferable_mmpdu(hdr->frame_control)) {
			info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER;
			return TX_CONTINUE;
		}

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		ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n",
		       sta->sta.addr, sta->sta.aid, ac);
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		if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
			purge_old_ps_buffers(tx->local);
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		/* sync with ieee80211_sta_ps_deliver_wakeup */
		spin_lock(&sta->ps_lock);
		/*
		 * STA woke up the meantime and all the frames on ps_tx_buf have
		 * been queued to pending queue. No reordering can happen, go
		 * ahead and Tx the packet.
		 */
		if (!test_sta_flag(sta, WLAN_STA_PS_STA) &&
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		    !test_sta_flag(sta, WLAN_STA_PS_DRIVER) &&
		    !test_sta_flag(sta, WLAN_STA_PS_DELIVER)) {
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			spin_unlock(&sta->ps_lock);
			return TX_CONTINUE;
		}

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		if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) {
			struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]);
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			ps_dbg(tx->sdata,
			       "STA %pM TX buffer for AC %d full - dropping oldest frame\n",
			       sta->sta.addr, ac);
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			ieee80211_free_txskb(&local->hw, old);
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		} else
			tx->local->total_ps_buffered++;
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		info->control.jiffies = jiffies;
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		info->control.vif = &tx->sdata->vif;
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		info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
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		info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
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		skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb);
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		spin_unlock(&sta->ps_lock);
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		if (!timer_pending(&local->sta_cleanup))
			mod_timer(&local->sta_cleanup,
				  round_jiffies(jiffies +
						STA_INFO_CLEANUP_INTERVAL));

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		/*
		 * We queued up some frames, so the TIM bit might
		 * need to be set, recalculate it.
		 */
		sta_info_recalc_tim(sta);

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		return TX_QUEUED;
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	} else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) {
		ps_dbg(tx->sdata,
		       "STA %pM in PS mode, but polling/in SP -> send frame\n",
		       sta->sta.addr);
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	}

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	return TX_CONTINUE;
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}

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static ieee80211_tx_result debug_noinline
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ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx)
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{
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	if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED))
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		return TX_CONTINUE;
550

551
	if (tx->flags & IEEE80211_TX_UNICAST)
552 553 554 555 556
		return ieee80211_tx_h_unicast_ps_buf(tx);
	else
		return ieee80211_tx_h_multicast_ps_buf(tx);
}

557 558 559 560 561
static ieee80211_tx_result debug_noinline
ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx)
{
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);

562 563 564 565 566
	if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol)) {
		if (tx->sdata->control_port_no_encrypt)
			info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
		info->control.flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO;
	}
567 568 569 570

	return TX_CONTINUE;
}

571
static ieee80211_tx_result debug_noinline
572
ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
573
{
574
	struct ieee80211_key *key;
575
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
576
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
577

J
Johannes Berg 已提交
578
	if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT))
579
		tx->key = NULL;
580 581
	else if (tx->sta &&
		 (key = rcu_dereference(tx->sta->ptk[tx->sta->ptk_idx])))
582
		tx->key = key;
583
	else if (ieee80211_is_mgmt(hdr->frame_control) &&
584
		 is_multicast_ether_addr(hdr->addr1) &&
585
		 ieee80211_is_robust_mgmt_frame(tx->skb) &&
586 587
		 (key = rcu_dereference(tx->sdata->default_mgmt_key)))
		tx->key = key;
588 589 590 591 592
	else if (is_multicast_ether_addr(hdr->addr1) &&
		 (key = rcu_dereference(tx->sdata->default_multicast_key)))
		tx->key = key;
	else if (!is_multicast_ether_addr(hdr->addr1) &&
		 (key = rcu_dereference(tx->sdata->default_unicast_key)))
593
		tx->key = key;
594 595 596 597 598 599
	else if (info->flags & IEEE80211_TX_CTL_INJECTED)
		tx->key = NULL;
	else if (!tx->sdata->drop_unencrypted)
		tx->key = NULL;
	else if (tx->skb->protocol == tx->sdata->control_port_protocol)
		tx->key = NULL;
600
	else if (ieee80211_is_robust_mgmt_frame(tx->skb) &&
601 602 603
		 !(ieee80211_is_action(hdr->frame_control) &&
		   tx->sta && test_sta_flag(tx->sta, WLAN_STA_MFP)))
		tx->key = NULL;
604
	else if (ieee80211_is_mgmt(hdr->frame_control) &&
605
		 !ieee80211_is_robust_mgmt_frame(tx->skb))
606
		tx->key = NULL;
607
	else {
608
		I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted);
609
		return TX_DROP;
610
	}
611 612

	if (tx->key) {
613 614
		bool skip_hw = false;

615
		tx->key->tx_rx_count++;
616
		/* TODO: add threshold stuff again */
617

618 619 620 621
		switch (tx->key->conf.cipher) {
		case WLAN_CIPHER_SUITE_WEP40:
		case WLAN_CIPHER_SUITE_WEP104:
		case WLAN_CIPHER_SUITE_TKIP:
622
			if (!ieee80211_is_data_present(hdr->frame_control))
623 624
				tx->key = NULL;
			break;
625
		case WLAN_CIPHER_SUITE_CCMP:
626 627 628 629
			if (!ieee80211_is_data_present(hdr->frame_control) &&
			    !ieee80211_use_mfp(hdr->frame_control, tx->sta,
					       tx->skb))
				tx->key = NULL;
630 631
			else
				skip_hw = (tx->key->conf.flags &
632
					   IEEE80211_KEY_FLAG_SW_MGMT_TX) &&
633
					ieee80211_is_mgmt(hdr->frame_control);
634
			break;
635
		case WLAN_CIPHER_SUITE_AES_CMAC:
636 637 638
			if (!ieee80211_is_mgmt(hdr->frame_control))
				tx->key = NULL;
			break;
639
		}
640

641 642
		if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED &&
			     !ieee80211_is_deauth(hdr->frame_control)))
643 644
			return TX_DROP;

J
Johannes Berg 已提交
645
		if (!skip_hw && tx->key &&
J
Johannes Berg 已提交
646
		    tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
647
			info->control.hw_key = &tx->key->conf;
648 649
	}

650
	return TX_CONTINUE;
651 652
}

653
static ieee80211_tx_result debug_noinline
654
ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
655
{
656
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
657 658
	struct ieee80211_hdr *hdr = (void *)tx->skb->data;
	struct ieee80211_supported_band *sband;
S
Shanyu Zhao 已提交
659
	u32 len;
660
	struct ieee80211_tx_rate_control txrc;
661
	struct ieee80211_sta_rates *ratetbl = NULL;
J
Johannes Berg 已提交
662
	bool assoc = false;
663

664
	memset(&txrc, 0, sizeof(txrc));
665

666
	sband = tx->local->hw.wiphy->bands[info->band];
667

S
Shanyu Zhao 已提交
668
	len = min_t(u32, tx->skb->len + FCS_LEN,
669
			 tx->local->hw.wiphy->frag_threshold);
670 671

	/* set up the tx rate control struct we give the RC algo */
J
Johannes Berg 已提交
672
	txrc.hw = &tx->local->hw;
673 674 675 676
	txrc.sband = sband;
	txrc.bss_conf = &tx->sdata->vif.bss_conf;
	txrc.skb = tx->skb;
	txrc.reported_rate.idx = -1;
677
	txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band];
678 679 680 681
	if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1)
		txrc.max_rate_idx = -1;
	else
		txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
682 683 684 685 686

	if (tx->sdata->rc_has_mcs_mask[info->band])
		txrc.rate_idx_mcs_mask =
			tx->sdata->rc_rateidx_mcs_mask[info->band];

687
	txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
688
		    tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT ||
689
		    tx->sdata->vif.type == NL80211_IFTYPE_ADHOC);
690 691

	/* set up RTS protection if desired */
692
	if (len > tx->local->hw.wiphy->rts_threshold) {
693
		txrc.rts = true;
694 695
	}

696
	info->control.use_rts = txrc.rts;
697 698
	info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot;

699 700 701 702 703 704 705 706
	/*
	 * Use short preamble if the BSS can handle it, but not for
	 * management frames unless we know the receiver can handle
	 * that -- the management frame might be to a station that
	 * just wants a probe response.
	 */
	if (tx->sdata->vif.bss_conf.use_short_preamble &&
	    (ieee80211_is_data(hdr->frame_control) ||
J
Johannes Berg 已提交
707
	     (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE))))
708 709 710
		txrc.short_preamble = true;

	info->control.short_preamble = txrc.short_preamble;
711

J
Johannes Berg 已提交
712 713
	if (tx->sta)
		assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
714 715 716 717 718

	/*
	 * Lets not bother rate control if we're associated and cannot
	 * talk to the sta. This should not happen.
	 */
J
Johannes Berg 已提交
719
	if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc &&
720 721 722 723
		 !rate_usable_index_exists(sband, &tx->sta->sta),
		 "%s: Dropped data frame as no usable bitrate found while "
		 "scanning and associated. Target station: "
		 "%pM on %d GHz band\n",
724
		 tx->sdata->name, hdr->addr1,
725
		 info->band ? 5 : 2))
726
		return TX_DROP;
727

728 729 730 731
	/*
	 * If we're associated with the sta at this point we know we can at
	 * least send the frame at the lowest bit rate.
	 */
732 733
	rate_control_get_rate(tx->sdata, tx->sta, &txrc);

734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754
	if (tx->sta && !info->control.skip_table)
		ratetbl = rcu_dereference(tx->sta->sta.rates);

	if (unlikely(info->control.rates[0].idx < 0)) {
		if (ratetbl) {
			struct ieee80211_tx_rate rate = {
				.idx = ratetbl->rate[0].idx,
				.flags = ratetbl->rate[0].flags,
				.count = ratetbl->rate[0].count
			};

			if (ratetbl->rate[0].idx < 0)
				return TX_DROP;

			tx->rate = rate;
		} else {
			return TX_DROP;
		}
	} else {
		tx->rate = info->control.rates[0];
	}
755

756
	if (txrc.reported_rate.idx < 0) {
757
		txrc.reported_rate = tx->rate;
758 759 760
		if (tx->sta && ieee80211_is_data(hdr->frame_control))
			tx->sta->last_tx_rate = txrc.reported_rate;
	} else if (tx->sta)
761
		tx->sta->last_tx_rate = txrc.reported_rate;
762

763 764 765
	if (ratetbl)
		return TX_CONTINUE;

766 767
	if (unlikely(!info->control.rates[0].count))
		info->control.rates[0].count = 1;
768

769 770 771 772
	if (WARN_ON_ONCE((info->control.rates[0].count > 1) &&
			 (info->flags & IEEE80211_TX_CTL_NO_ACK)))
		info->control.rates[0].count = 1;

773 774 775
	return TX_CONTINUE;
}

776 777 778 779 780 781 782 783 784
static ieee80211_tx_result debug_noinline
ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx)
{
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
	u16 *seq;
	u8 *qc;
	int tid;

785 786 787 788 789
	/*
	 * Packet injection may want to control the sequence
	 * number, if we have no matching interface then we
	 * neither assign one ourselves nor ask the driver to.
	 */
790
	if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR))
791 792
		return TX_CONTINUE;

793 794 795 796 797 798
	if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
		return TX_CONTINUE;

	if (ieee80211_hdrlen(hdr->frame_control) < 24)
		return TX_CONTINUE;

799 800 801
	if (ieee80211_is_qos_nullfunc(hdr->frame_control))
		return TX_CONTINUE;

J
Johannes Berg 已提交
802 803 804
	/*
	 * Anything but QoS data that has a sequence number field
	 * (is long enough) gets a sequence number from the global
805 806
	 * counter.  QoS data frames with a multicast destination
	 * also use the global counter (802.11-2012 9.3.2.10).
J
Johannes Berg 已提交
807
	 */
808 809
	if (!ieee80211_is_data_qos(hdr->frame_control) ||
	    is_multicast_ether_addr(hdr->addr1)) {
J
Johannes Berg 已提交
810
		/* driver should assign sequence number */
811
		info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
J
Johannes Berg 已提交
812 813 814
		/* for pure STA mode without beacons, we can do it */
		hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number);
		tx->sdata->sequence_number += 0x10;
815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839
		return TX_CONTINUE;
	}

	/*
	 * This should be true for injected/management frames only, for
	 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
	 * above since they are not QoS-data frames.
	 */
	if (!tx->sta)
		return TX_CONTINUE;

	/* include per-STA, per-TID sequence counter */

	qc = ieee80211_get_qos_ctl(hdr);
	tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
	seq = &tx->sta->tid_seq[tid];

	hdr->seq_ctrl = cpu_to_le16(*seq);

	/* Increase the sequence number. */
	*seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ;

	return TX_CONTINUE;
}

840
static int ieee80211_fragment(struct ieee80211_tx_data *tx,
J
Johannes Berg 已提交
841 842 843
			      struct sk_buff *skb, int hdrlen,
			      int frag_threshold)
{
844
	struct ieee80211_local *local = tx->local;
845
	struct ieee80211_tx_info *info;
846
	struct sk_buff *tmp;
J
Johannes Berg 已提交
847 848 849 850 851 852 853
	int per_fragm = frag_threshold - hdrlen - FCS_LEN;
	int pos = hdrlen + per_fragm;
	int rem = skb->len - hdrlen - per_fragm;

	if (WARN_ON(rem < 0))
		return -EINVAL;

854 855
	/* first fragment was already added to queue by caller */

J
Johannes Berg 已提交
856 857 858 859 860 861 862 863
	while (rem) {
		int fraglen = per_fragm;

		if (fraglen > rem)
			fraglen = rem;
		rem -= fraglen;
		tmp = dev_alloc_skb(local->tx_headroom +
				    frag_threshold +
864
				    tx->sdata->encrypt_headroom +
J
Johannes Berg 已提交
865 866 867
				    IEEE80211_ENCRYPT_TAILROOM);
		if (!tmp)
			return -ENOMEM;
868 869 870

		__skb_queue_tail(&tx->skbs, tmp);

871 872 873
		skb_reserve(tmp,
			    local->tx_headroom + tx->sdata->encrypt_headroom);

J
Johannes Berg 已提交
874 875
		/* copy control information */
		memcpy(tmp->cb, skb->cb, sizeof(tmp->cb));
876 877 878 879 880 881 882 883

		info = IEEE80211_SKB_CB(tmp);
		info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT |
				 IEEE80211_TX_CTL_FIRST_FRAGMENT);

		if (rem)
			info->flags |= IEEE80211_TX_CTL_MORE_FRAMES;

J
Johannes Berg 已提交
884 885 886 887 888 889 890 891 892 893 894
		skb_copy_queue_mapping(tmp, skb);
		tmp->priority = skb->priority;
		tmp->dev = skb->dev;

		/* copy header and data */
		memcpy(skb_put(tmp, hdrlen), skb->data, hdrlen);
		memcpy(skb_put(tmp, fraglen), skb->data + pos, fraglen);

		pos += fraglen;
	}

895
	/* adjust first fragment's length */
896
	skb_trim(skb, hdrlen + per_fragm);
J
Johannes Berg 已提交
897 898 899
	return 0;
}

900
static ieee80211_tx_result debug_noinline
901 902
ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
{
J
Johannes Berg 已提交
903 904 905
	struct sk_buff *skb = tx->skb;
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
	struct ieee80211_hdr *hdr = (void *)skb->data;
906
	int frag_threshold = tx->local->hw.wiphy->frag_threshold;
J
Johannes Berg 已提交
907 908
	int hdrlen;
	int fragnum;
909

910 911 912 913
	/* no matter what happens, tx->skb moves to tx->skbs */
	__skb_queue_tail(&tx->skbs, skb);
	tx->skb = NULL;

914 915 916 917
	if (info->flags & IEEE80211_TX_CTL_DONTFRAG)
		return TX_CONTINUE;

	if (tx->local->ops->set_frag_threshold)
918 919
		return TX_CONTINUE;

920 921
	/*
	 * Warn when submitting a fragmented A-MPDU frame and drop it.
J
Johannes Berg 已提交
922
	 * This scenario is handled in ieee80211_tx_prepare but extra
923
	 * caution taken here as fragmented ampdu may cause Tx stop.
924
	 */
S
Sujith 已提交
925
	if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
926 927
		return TX_DROP;

928
	hdrlen = ieee80211_hdrlen(hdr->frame_control);
929

930
	/* internal error, why isn't DONTFRAG set? */
931
	if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))
J
Johannes Berg 已提交
932
		return TX_DROP;
933

J
Johannes Berg 已提交
934 935 936 937 938 939 940 941
	/*
	 * Now fragment the frame. This will allocate all the fragments and
	 * chain them (using skb as the first fragment) to skb->next.
	 * During transmission, we will remove the successfully transmitted
	 * fragments from this list. When the low-level driver rejects one
	 * of the fragments then we will simply pretend to accept the skb
	 * but store it away as pending.
	 */
942
	if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold))
J
Johannes Berg 已提交
943
		return TX_DROP;
944

J
Johannes Berg 已提交
945 946
	/* update duration/seq/flags of fragments */
	fragnum = 0;
947 948

	skb_queue_walk(&tx->skbs, skb) {
J
Johannes Berg 已提交
949
		const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
950

J
Johannes Berg 已提交
951 952
		hdr = (void *)skb->data;
		info = IEEE80211_SKB_CB(skb);
953

954
		if (!skb_queue_is_last(&tx->skbs, skb)) {
J
Johannes Berg 已提交
955
			hdr->frame_control |= morefrags;
956 957 958 959 960 961 962
			/*
			 * No multi-rate retries for fragmented frames, that
			 * would completely throw off the NAV at other STAs.
			 */
			info->control.rates[1].idx = -1;
			info->control.rates[2].idx = -1;
			info->control.rates[3].idx = -1;
963
			BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4);
964
			info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
J
Johannes Berg 已提交
965 966
		} else {
			hdr->frame_control &= ~morefrags;
967
		}
J
Johannes Berg 已提交
968 969
		hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG);
		fragnum++;
970
	}
971

972
	return TX_CONTINUE;
973 974
}

975 976 977
static ieee80211_tx_result debug_noinline
ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
{
978
	struct sk_buff *skb;
979
	int ac = -1;
980 981 982 983

	if (!tx->sta)
		return TX_CONTINUE;

984
	skb_queue_walk(&tx->skbs, skb) {
985
		ac = skb_get_queue_mapping(skb);
986
		tx->sta->tx_fragments++;
987
		tx->sta->tx_bytes[ac] += skb->len;
988
	}
989 990
	if (ac >= 0)
		tx->sta->tx_packets[ac]++;
991 992 993 994

	return TX_CONTINUE;
}

995
static ieee80211_tx_result debug_noinline
996 997 998 999 1000
ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
{
	if (!tx->key)
		return TX_CONTINUE;

1001 1002 1003
	switch (tx->key->conf.cipher) {
	case WLAN_CIPHER_SUITE_WEP40:
	case WLAN_CIPHER_SUITE_WEP104:
1004
		return ieee80211_crypto_wep_encrypt(tx);
1005
	case WLAN_CIPHER_SUITE_TKIP:
1006
		return ieee80211_crypto_tkip_encrypt(tx);
1007
	case WLAN_CIPHER_SUITE_CCMP:
1008
		return ieee80211_crypto_ccmp_encrypt(tx);
1009
	case WLAN_CIPHER_SUITE_AES_CMAC:
1010
		return ieee80211_crypto_aes_cmac_encrypt(tx);
1011
	default:
1012
		return ieee80211_crypto_hw_encrypt(tx);
1013 1014 1015 1016 1017
	}

	return TX_DROP;
}

1018
static ieee80211_tx_result debug_noinline
J
Johannes Berg 已提交
1019 1020
ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
{
1021
	struct sk_buff *skb;
J
Johannes Berg 已提交
1022 1023 1024
	struct ieee80211_hdr *hdr;
	int next_len;
	bool group_addr;
J
Johannes Berg 已提交
1025

1026
	skb_queue_walk(&tx->skbs, skb) {
J
Johannes Berg 已提交
1027
		hdr = (void *) skb->data;
1028 1029
		if (unlikely(ieee80211_is_pspoll(hdr->frame_control)))
			break; /* must not overwrite AID */
1030 1031 1032 1033 1034
		if (!skb_queue_is_last(&tx->skbs, skb)) {
			struct sk_buff *next = skb_queue_next(&tx->skbs, skb);
			next_len = next->len;
		} else
			next_len = 0;
J
Johannes Berg 已提交
1035
		group_addr = is_multicast_ether_addr(hdr->addr1);
J
Johannes Berg 已提交
1036

J
Johannes Berg 已提交
1037
		hdr->duration_id =
1038 1039
			ieee80211_duration(tx, skb, group_addr, next_len);
	}
J
Johannes Berg 已提交
1040 1041 1042 1043

	return TX_CONTINUE;
}

1044 1045
/* actual transmit path */

1046 1047 1048 1049 1050 1051 1052
static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx,
				  struct sk_buff *skb,
				  struct ieee80211_tx_info *info,
				  struct tid_ampdu_tx *tid_tx,
				  int tid)
{
	bool queued = false;
1053
	bool reset_agg_timer = false;
1054
	struct sk_buff *purge_skb = NULL;
1055 1056 1057

	if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
		info->flags |= IEEE80211_TX_CTL_AMPDU;
1058
		reset_agg_timer = true;
1059 1060 1061 1062 1063
	} else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) {
		/*
		 * nothing -- this aggregation session is being started
		 * but that might still fail with the driver
		 */
1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083
	} else {
		spin_lock(&tx->sta->lock);
		/*
		 * Need to re-check now, because we may get here
		 *
		 *  1) in the window during which the setup is actually
		 *     already done, but not marked yet because not all
		 *     packets are spliced over to the driver pending
		 *     queue yet -- if this happened we acquire the lock
		 *     either before or after the splice happens, but
		 *     need to recheck which of these cases happened.
		 *
		 *  2) during session teardown, if the OPERATIONAL bit
		 *     was cleared due to the teardown but the pointer
		 *     hasn't been assigned NULL yet (or we loaded it
		 *     before it was assigned) -- in this case it may
		 *     now be NULL which means we should just let the
		 *     packet pass through because splicing the frames
		 *     back is already done.
		 */
J
Johannes Berg 已提交
1084
		tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid);
1085 1086 1087 1088 1089

		if (!tid_tx) {
			/* do nothing, let packet pass through */
		} else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
			info->flags |= IEEE80211_TX_CTL_AMPDU;
1090
			reset_agg_timer = true;
1091 1092 1093 1094
		} else {
			queued = true;
			info->control.vif = &tx->sdata->vif;
			info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1095
			info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
1096
			__skb_queue_tail(&tid_tx->pending, skb);
1097 1098
			if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER)
				purge_skb = __skb_dequeue(&tid_tx->pending);
1099 1100
		}
		spin_unlock(&tx->sta->lock);
1101 1102

		if (purge_skb)
1103
			ieee80211_free_txskb(&tx->local->hw, purge_skb);
1104 1105
	}

1106 1107
	/* reset session timer */
	if (reset_agg_timer && tid_tx->timeout)
1108
		tid_tx->last_tx = jiffies;
1109

1110 1111 1112
	return queued;
}

1113 1114 1115
/*
 * initialises @tx
 */
1116
static ieee80211_tx_result
J
Johannes Berg 已提交
1117 1118 1119
ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
		     struct ieee80211_tx_data *tx,
		     struct sk_buff *skb)
1120
{
J
Johannes Berg 已提交
1121
	struct ieee80211_local *local = sdata->local;
1122
	struct ieee80211_hdr *hdr;
1123
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
J
Johannes Berg 已提交
1124
	int tid;
1125
	u8 *qc;
1126 1127 1128 1129

	memset(tx, 0, sizeof(*tx));
	tx->skb = skb;
	tx->local = local;
J
Johannes Berg 已提交
1130
	tx->sdata = sdata;
1131
	__skb_queue_head_init(&tx->skbs);
1132

1133 1134 1135 1136 1137 1138 1139
	/*
	 * If this flag is set to true anywhere, and we get here,
	 * we are doing the needed processing, so remove the flag
	 * now.
	 */
	info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING;

1140 1141
	hdr = (struct ieee80211_hdr *) skb->data;

1142
	if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1143
		tx->sta = rcu_dereference(sdata->u.vlan.sta);
1144 1145
		if (!tx->sta && sdata->dev->ieee80211_ptr->use_4addr)
			return TX_DROP;
1146 1147
	} else if (info->flags & (IEEE80211_TX_CTL_INJECTED |
				  IEEE80211_TX_INTFL_NL80211_FRAME_TX) ||
1148
		   tx->sdata->control_port_protocol == tx->skb->protocol) {
1149
		tx->sta = sta_info_get_bss(sdata, hdr->addr1);
1150
	}
1151
	if (!tx->sta)
1152
		tx->sta = sta_info_get(sdata, hdr->addr1);
1153

1154
	if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) &&
1155
	    !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
1156 1157
	    (local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION) &&
	    !(local->hw.flags & IEEE80211_HW_TX_AMPDU_SETUP_IN_HW)) {
1158 1159
		struct tid_ampdu_tx *tid_tx;

S
Sujith 已提交
1160 1161 1162
		qc = ieee80211_get_qos_ctl(hdr);
		tid = *qc & IEEE80211_QOS_CTL_TID_MASK;

1163 1164 1165
		tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
		if (tid_tx) {
			bool queued;
1166

1167 1168 1169 1170 1171 1172
			queued = ieee80211_tx_prep_agg(tx, skb, info,
						       tid_tx, tid);

			if (unlikely(queued))
				return TX_QUEUED;
		}
S
Sujith 已提交
1173 1174
	}

1175
	if (is_multicast_ether_addr(hdr->addr1)) {
1176
		tx->flags &= ~IEEE80211_TX_UNICAST;
1177
		info->flags |= IEEE80211_TX_CTL_NO_ACK;
1178
	} else
1179
		tx->flags |= IEEE80211_TX_UNICAST;
1180

1181 1182 1183 1184 1185
	if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) {
		if (!(tx->flags & IEEE80211_TX_UNICAST) ||
		    skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold ||
		    info->flags & IEEE80211_TX_CTL_AMPDU)
			info->flags |= IEEE80211_TX_CTL_DONTFRAG;
1186 1187
	}

1188
	if (!tx->sta)
1189
		info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
J
Johannes Berg 已提交
1190
	else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT))
1191
		info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1192

1193
	info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
1194

1195
	return TX_CONTINUE;
1196 1197
}

1198 1199 1200 1201 1202
static bool ieee80211_tx_frags(struct ieee80211_local *local,
			       struct ieee80211_vif *vif,
			       struct ieee80211_sta *sta,
			       struct sk_buff_head *skbs,
			       bool txpending)
1203
{
1204
	struct ieee80211_tx_control control;
1205
	struct sk_buff *skb, *tmp;
J
Johannes Berg 已提交
1206
	unsigned long flags;
1207

1208
	skb_queue_walk_safe(skbs, skb, tmp) {
1209 1210 1211 1212 1213 1214
		struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
		int q = info->hw_queue;

#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
		if (WARN_ON_ONCE(q >= local->hw.queues)) {
			__skb_unlink(skb, skbs);
1215
			ieee80211_free_txskb(&local->hw, skb);
1216 1217 1218
			continue;
		}
#endif
J
Johannes Berg 已提交
1219 1220 1221

		spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
		if (local->queue_stop_reasons[q] ||
1222
		    (!txpending && !skb_queue_empty(&local->pending[q]))) {
1223
			if (unlikely(info->flags &
1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241
				     IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) {
				if (local->queue_stop_reasons[q] &
				    ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) {
					/*
					 * Drop off-channel frames if queues
					 * are stopped for any reason other
					 * than off-channel operation. Never
					 * queue them.
					 */
					spin_unlock_irqrestore(
						&local->queue_stop_reason_lock,
						flags);
					ieee80211_purge_tx_queue(&local->hw,
								 skbs);
					return true;
				}
			} else {

1242
				/*
1243 1244 1245
				 * Since queue is stopped, queue up frames for
				 * later transmission from the tx-pending
				 * tasklet when the queue is woken again.
1246
				 */
1247 1248 1249 1250 1251 1252 1253 1254 1255 1256
				if (txpending)
					skb_queue_splice_init(skbs,
							      &local->pending[q]);
				else
					skb_queue_splice_tail_init(skbs,
								   &local->pending[q]);

				spin_unlock_irqrestore(&local->queue_stop_reason_lock,
						       flags);
				return false;
1257
			}
1258
		}
J
Johannes Berg 已提交
1259
		spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1260

1261
		info->control.vif = vif;
1262
		control.sta = sta;
1263

1264
		__skb_unlink(skb, skbs);
1265
		drv_tx(local, &control, skb);
1266
	}
1267

1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284
	return true;
}

/*
 * Returns false if the frame couldn't be transmitted but was queued instead.
 */
static bool __ieee80211_tx(struct ieee80211_local *local,
			   struct sk_buff_head *skbs, int led_len,
			   struct sta_info *sta, bool txpending)
{
	struct ieee80211_tx_info *info;
	struct ieee80211_sub_if_data *sdata;
	struct ieee80211_vif *vif;
	struct ieee80211_sta *pubsta;
	struct sk_buff *skb;
	bool result = true;
	__le16 fc;
1285

1286 1287
	if (WARN_ON(skb_queue_empty(skbs)))
		return true;
J
Johannes Berg 已提交
1288

1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302
	skb = skb_peek(skbs);
	fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
	info = IEEE80211_SKB_CB(skb);
	sdata = vif_to_sdata(info->control.vif);
	if (sta && !sta->uploaded)
		sta = NULL;

	if (sta)
		pubsta = &sta->sta;
	else
		pubsta = NULL;

	switch (sdata->vif.type) {
	case NL80211_IFTYPE_MONITOR:
1303 1304 1305 1306
		if (sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE) {
			vif = &sdata->vif;
			break;
		}
1307
		sdata = rcu_dereference(local->monitor_sdata);
1308
		if (sdata) {
1309
			vif = &sdata->vif;
1310 1311 1312 1313 1314 1315
			info->hw_queue =
				vif->hw_queue[skb_get_queue_mapping(skb)];
		} else if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL) {
			dev_kfree_skb(skb);
			return true;
		} else
1316
			vif = NULL;
1317 1318 1319 1320 1321 1322 1323 1324
		break;
	case NL80211_IFTYPE_AP_VLAN:
		sdata = container_of(sdata->bss,
				     struct ieee80211_sub_if_data, u.ap);
		/* fall through */
	default:
		vif = &sdata->vif;
		break;
1325
	}
J
Johannes Berg 已提交
1326

1327 1328
	result = ieee80211_tx_frags(local, vif, pubsta, skbs,
				    txpending);
1329

1330 1331
	ieee80211_tpt_led_trig_tx(local, fc, led_len);

J
Johannes Berg 已提交
1332
	WARN_ON_ONCE(!skb_queue_empty(skbs));
1333

1334
	return result;
1335 1336
}

1337 1338 1339 1340 1341 1342
/*
 * Invoke TX handlers, return 0 on success and non-zero if the
 * frame was dropped or queued.
 */
static int invoke_tx_handlers(struct ieee80211_tx_data *tx)
{
1343
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
1344 1345
	ieee80211_tx_result res = TX_DROP;

1346 1347 1348 1349 1350 1351 1352
#define CALL_TXH(txh) \
	do {				\
		res = txh(tx);		\
		if (res != TX_CONTINUE)	\
			goto txh_done;	\
	} while (0)

1353
	CALL_TXH(ieee80211_tx_h_dynamic_ps);
1354 1355
	CALL_TXH(ieee80211_tx_h_check_assoc);
	CALL_TXH(ieee80211_tx_h_ps_buf);
1356
	CALL_TXH(ieee80211_tx_h_check_control_port_protocol);
1357
	CALL_TXH(ieee80211_tx_h_select_key);
1358 1359
	if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
		CALL_TXH(ieee80211_tx_h_rate_ctrl);
1360

J
Johannes Berg 已提交
1361 1362 1363
	if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) {
		__skb_queue_tail(&tx->skbs, tx->skb);
		tx->skb = NULL;
1364
		goto txh_done;
J
Johannes Berg 已提交
1365
	}
1366 1367

	CALL_TXH(ieee80211_tx_h_michael_mic_add);
1368 1369
	CALL_TXH(ieee80211_tx_h_sequence);
	CALL_TXH(ieee80211_tx_h_fragment);
1370
	/* handlers after fragment must be aware of tx info fragmentation! */
1371 1372
	CALL_TXH(ieee80211_tx_h_stats);
	CALL_TXH(ieee80211_tx_h_encrypt);
1373 1374
	if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
		CALL_TXH(ieee80211_tx_h_calculate_duration);
1375
#undef CALL_TXH
1376

1377
 txh_done:
1378
	if (unlikely(res == TX_DROP)) {
1379
		I802_DEBUG_INC(tx->local->tx_handlers_drop);
1380
		if (tx->skb)
1381
			ieee80211_free_txskb(&tx->local->hw, tx->skb);
1382
		else
1383
			ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs);
1384 1385
		return -1;
	} else if (unlikely(res == TX_QUEUED)) {
1386
		I802_DEBUG_INC(tx->local->tx_handlers_queued);
1387 1388 1389 1390 1391 1392
		return -1;
	}

	return 0;
}

1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421
bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw,
			      struct ieee80211_vif *vif, struct sk_buff *skb,
			      int band, struct ieee80211_sta **sta)
{
	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
	struct ieee80211_tx_data tx;

	if (ieee80211_tx_prepare(sdata, &tx, skb) == TX_DROP)
		return false;

	info->band = band;
	info->control.vif = vif;
	info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)];

	if (invoke_tx_handlers(&tx))
		return false;

	if (sta) {
		if (tx.sta)
			*sta = &tx.sta->sta;
		else
			*sta = NULL;
	}

	return true;
}
EXPORT_SYMBOL(ieee80211_tx_prepare_skb);

1422 1423 1424 1425
/*
 * Returns false if the frame couldn't be transmitted but was queued instead.
 */
static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata,
J
Johannes Berg 已提交
1426 1427
			 struct sk_buff *skb, bool txpending,
			 enum ieee80211_band band)
1428
{
J
Johannes Berg 已提交
1429
	struct ieee80211_local *local = sdata->local;
1430
	struct ieee80211_tx_data tx;
1431
	ieee80211_tx_result res_prepare;
1432
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1433
	bool result = true;
1434
	int led_len;
1435 1436 1437

	if (unlikely(skb->len < 10)) {
		dev_kfree_skb(skb);
1438
		return true;
1439 1440
	}

1441
	/* initialises tx */
1442
	led_len = skb->len;
J
Johannes Berg 已提交
1443
	res_prepare = ieee80211_tx_prepare(sdata, &tx, skb);
1444

1445
	if (unlikely(res_prepare == TX_DROP)) {
1446
		ieee80211_free_txskb(&local->hw, skb);
J
Johannes Berg 已提交
1447
		return true;
1448
	} else if (unlikely(res_prepare == TX_QUEUED)) {
J
Johannes Berg 已提交
1449
		return true;
1450 1451
	}

J
Johannes Berg 已提交
1452
	info->band = band;
1453

1454 1455 1456 1457 1458 1459
	/* set up hw_queue value early */
	if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) ||
	    !(local->hw.flags & IEEE80211_HW_QUEUE_CONTROL))
		info->hw_queue =
			sdata->vif.hw_queue[skb_get_queue_mapping(skb)];

1460
	if (!invoke_tx_handlers(&tx))
1461 1462
		result = __ieee80211_tx(local, &tx.skbs, led_len,
					tx.sta, txpending);
J
Johannes Berg 已提交
1463

1464
	return result;
1465 1466 1467 1468
}

/* device xmit handlers */

1469
static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata,
1470 1471 1472
				struct sk_buff *skb,
				int head_need, bool may_encrypt)
{
1473
	struct ieee80211_local *local = sdata->local;
1474 1475
	int tail_need = 0;

1476
	if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) {
1477 1478 1479 1480 1481
		tail_need = IEEE80211_ENCRYPT_TAILROOM;
		tail_need -= skb_tailroom(skb);
		tail_need = max_t(int, tail_need, 0);
	}

1482 1483 1484 1485
	if (skb_cloned(skb) &&
	    (!(local->hw.flags & IEEE80211_HW_SUPPORTS_CLONED_SKBS) ||
	     !skb_clone_writable(skb, ETH_HLEN) ||
	     sdata->crypto_tx_tailroom_needed_cnt))
1486
		I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1487
	else if (head_need || tail_need)
1488
		I802_DEBUG_INC(local->tx_expand_skb_head);
1489 1490
	else
		return 0;
1491 1492

	if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
J
Joe Perches 已提交
1493 1494
		wiphy_debug(local->hw.wiphy,
			    "failed to reallocate TX buffer\n");
1495 1496 1497 1498 1499 1500
		return -ENOMEM;
	}

	return 0;
}

J
Johannes Berg 已提交
1501 1502
void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
		    enum ieee80211_band band)
1503
{
J
Johannes Berg 已提交
1504
	struct ieee80211_local *local = sdata->local;
1505
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1506
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1507
	int headroom;
1508
	bool may_encrypt;
1509

J
Johannes Berg 已提交
1510
	may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT);
1511

J
Johannes Berg 已提交
1512
	headroom = local->tx_headroom;
1513
	if (may_encrypt)
1514
		headroom += sdata->encrypt_headroom;
1515 1516 1517
	headroom -= skb_headroom(skb);
	headroom = max_t(int, 0, headroom);

1518
	if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) {
1519
		ieee80211_free_txskb(&local->hw, skb);
J
Johannes Berg 已提交
1520
		return;
1521 1522
	}

1523
	hdr = (struct ieee80211_hdr *) skb->data;
1524
	info->control.vif = &sdata->vif;
1525

M
Marco Porsch 已提交
1526 1527 1528
	if (ieee80211_vif_is_mesh(&sdata->vif)) {
		if (ieee80211_is_data(hdr->frame_control) &&
		    is_unicast_ether_addr(hdr->addr1)) {
J
Johannes Berg 已提交
1529
			if (mesh_nexthop_resolve(sdata, skb))
M
Marco Porsch 已提交
1530 1531 1532 1533
				return; /* skb queued: don't free */
		} else {
			ieee80211_mps_set_frame_flags(sdata, NULL, hdr);
		}
1534
	}
1535

1536
	ieee80211_set_qos_hdr(sdata, skb);
J
Johannes Berg 已提交
1537
	ieee80211_tx(sdata, skb, false, band);
1538 1539
}

1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622
static bool ieee80211_parse_tx_radiotap(struct sk_buff *skb)
{
	struct ieee80211_radiotap_iterator iterator;
	struct ieee80211_radiotap_header *rthdr =
		(struct ieee80211_radiotap_header *) skb->data;
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
	int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len,
						   NULL);
	u16 txflags;

	info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
		       IEEE80211_TX_CTL_DONTFRAG;

	/*
	 * for every radiotap entry that is present
	 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
	 * entries present, or -EINVAL on error)
	 */

	while (!ret) {
		ret = ieee80211_radiotap_iterator_next(&iterator);

		if (ret)
			continue;

		/* see if this argument is something we can use */
		switch (iterator.this_arg_index) {
		/*
		 * You must take care when dereferencing iterator.this_arg
		 * for multibyte types... the pointer is not aligned.  Use
		 * get_unaligned((type *)iterator.this_arg) to dereference
		 * iterator.this_arg for type "type" safely on all arches.
		*/
		case IEEE80211_RADIOTAP_FLAGS:
			if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
				/*
				 * this indicates that the skb we have been
				 * handed has the 32-bit FCS CRC at the end...
				 * we should react to that by snipping it off
				 * because it will be recomputed and added
				 * on transmission
				 */
				if (skb->len < (iterator._max_length + FCS_LEN))
					return false;

				skb_trim(skb, skb->len - FCS_LEN);
			}
			if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
				info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT;
			if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
				info->flags &= ~IEEE80211_TX_CTL_DONTFRAG;
			break;

		case IEEE80211_RADIOTAP_TX_FLAGS:
			txflags = get_unaligned_le16(iterator.this_arg);
			if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK)
				info->flags |= IEEE80211_TX_CTL_NO_ACK;
			break;

		/*
		 * Please update the file
		 * Documentation/networking/mac80211-injection.txt
		 * when parsing new fields here.
		 */

		default:
			break;
		}
	}

	if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
		return false;

	/*
	 * remove the radiotap header
	 * iterator->_max_length was sanity-checked against
	 * skb->len by iterator init
	 */
	skb_pull(skb, iterator._max_length);

	return true;
}

1623 1624
netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
					 struct net_device *dev)
1625 1626
{
	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
J
Johannes Berg 已提交
1627
	struct ieee80211_chanctx_conf *chanctx_conf;
1628 1629
	struct ieee80211_radiotap_header *prthdr =
		(struct ieee80211_radiotap_header *)skb->data;
J
Johannes Berg 已提交
1630
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1631
	struct ieee80211_hdr *hdr;
J
Johannes Berg 已提交
1632
	struct ieee80211_sub_if_data *tmp_sdata, *sdata;
1633
	struct cfg80211_chan_def *chandef;
1634
	u16 len_rthdr;
J
Johannes Berg 已提交
1635
	int hdrlen;
1636

1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650
	/* check for not even having the fixed radiotap header part */
	if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
		goto fail; /* too short to be possibly valid */

	/* is it a header version we can trust to find length from? */
	if (unlikely(prthdr->it_version))
		goto fail; /* only version 0 is supported */

	/* then there must be a radiotap header with a length we can use */
	len_rthdr = ieee80211_get_radiotap_len(skb->data);

	/* does the skb contain enough to deliver on the alleged length? */
	if (unlikely(skb->len < len_rthdr))
		goto fail; /* skb too short for claimed rt header extent */
1651 1652 1653 1654 1655 1656 1657

	/*
	 * fix up the pointers accounting for the radiotap
	 * header still being in there.  We are being given
	 * a precooked IEEE80211 header so no need for
	 * normal processing
	 */
1658
	skb_set_mac_header(skb, len_rthdr);
1659
	/*
1660 1661
	 * these are just fixed to the end of the rt area since we
	 * don't have any better information and at this point, nobody cares
1662
	 */
1663 1664
	skb_set_network_header(skb, len_rthdr);
	skb_set_transport_header(skb, len_rthdr);
1665

J
Johannes Berg 已提交
1666 1667 1668 1669 1670 1671 1672 1673 1674
	if (skb->len < len_rthdr + 2)
		goto fail;

	hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
	hdrlen = ieee80211_hdrlen(hdr->frame_control);

	if (skb->len < len_rthdr + hdrlen)
		goto fail;

1675 1676 1677 1678
	/*
	 * Initialize skb->protocol if the injected frame is a data frame
	 * carrying a rfc1042 header
	 */
J
Johannes Berg 已提交
1679 1680 1681 1682
	if (ieee80211_is_data(hdr->frame_control) &&
	    skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) {
		u8 *payload = (u8 *)hdr + hdrlen;

1683
		if (ether_addr_equal(payload, rfc1042_header))
J
Johannes Berg 已提交
1684 1685
			skb->protocol = cpu_to_be16((payload[6] << 8) |
						    payload[7]);
1686 1687
	}

J
Johannes Berg 已提交
1688 1689
	memset(info, 0, sizeof(*info));

J
Johannes Berg 已提交
1690
	info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
1691 1692 1693 1694 1695
		      IEEE80211_TX_CTL_INJECTED;

	/* process and remove the injection radiotap header */
	if (!ieee80211_parse_tx_radiotap(skb))
		goto fail;
J
Johannes Berg 已提交
1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715

	rcu_read_lock();

	/*
	 * We process outgoing injected frames that have a local address
	 * we handle as though they are non-injected frames.
	 * This code here isn't entirely correct, the local MAC address
	 * isn't always enough to find the interface to use; for proper
	 * VLAN/WDS support we will need a different mechanism (which
	 * likely isn't going to be monitor interfaces).
	 */
	sdata = IEEE80211_DEV_TO_SUB_IF(dev);

	list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) {
		if (!ieee80211_sdata_running(tmp_sdata))
			continue;
		if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR ||
		    tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
		    tmp_sdata->vif.type == NL80211_IFTYPE_WDS)
			continue;
1716
		if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) {
J
Johannes Berg 已提交
1717 1718 1719 1720
			sdata = tmp_sdata;
			break;
		}
	}
1721

J
Johannes Berg 已提交
1722 1723 1724 1725 1726 1727 1728 1729
	chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
	if (!chanctx_conf) {
		tmp_sdata = rcu_dereference(local->monitor_sdata);
		if (tmp_sdata)
			chanctx_conf =
				rcu_dereference(tmp_sdata->vif.chanctx_conf);
	}

1730
	if (chanctx_conf)
1731
		chandef = &chanctx_conf->def;
1732
	else if (!local->use_chanctx)
1733
		chandef = &local->_oper_chandef;
1734 1735
	else
		goto fail_rcu;
J
Johannes Berg 已提交
1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752

	/*
	 * Frame injection is not allowed if beaconing is not allowed
	 * or if we need radar detection. Beaconing is usually not allowed when
	 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
	 * Passive scan is also used in world regulatory domains where
	 * your country is not known and as such it should be treated as
	 * NO TX unless the channel is explicitly allowed in which case
	 * your current regulatory domain would not have the passive scan
	 * flag.
	 *
	 * Since AP mode uses monitor interfaces to inject/TX management
	 * frames we can make AP mode the exception to this rule once it
	 * supports radar detection as its implementation can deal with
	 * radar detection by itself. We can do that later by adding a
	 * monitor flag interfaces used for AP support.
	 */
1753 1754
	if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef,
				     sdata->vif.type))
J
Johannes Berg 已提交
1755 1756
		goto fail_rcu;

1757
	ieee80211_xmit(sdata, skb, chandef->chan->band);
J
Johannes Berg 已提交
1758 1759
	rcu_read_unlock();

1760
	return NETDEV_TX_OK;
1761

J
Johannes Berg 已提交
1762 1763
fail_rcu:
	rcu_read_unlock();
1764 1765 1766
fail:
	dev_kfree_skb(skb);
	return NETDEV_TX_OK; /* meaning, we dealt with the skb */
1767 1768
}

1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782
/*
 * Measure Tx frame arrival time for Tx latency statistics calculation
 * A single Tx frame latency should be measured from when it is entering the
 * Kernel until we receive Tx complete confirmation indication and the skb is
 * freed.
 */
static void ieee80211_tx_latency_start_msrmnt(struct ieee80211_local *local,
					      struct sk_buff *skb)
{
	struct ieee80211_tx_latency_bin_ranges *tx_latency;

	tx_latency = rcu_dereference(local->tx_latency);
	if (!tx_latency)
		return;
1783
	skb->tstamp = ktime_get();
1784 1785
}

1786 1787 1788 1789 1790 1791
/**
 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
 * subinterfaces (wlan#, WDS, and VLAN interfaces)
 * @skb: packet to be sent
 * @dev: incoming interface
 *
1792 1793
 * Returns: NETDEV_TX_OK both on success and on failure. On failure skb will
 *	be freed.
1794 1795 1796 1797 1798 1799
 *
 * This function takes in an Ethernet header and encapsulates it with suitable
 * IEEE 802.11 header based on which interface the packet is coming in. The
 * encapsulated packet will then be passed to master interface, wlan#.11, for
 * transmission (through low-level driver).
 */
1800 1801
netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
				    struct net_device *dev)
1802
{
1803 1804
	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
	struct ieee80211_local *local = sdata->local;
1805
	struct ieee80211_tx_info *info;
1806
	int head_need;
1807 1808
	u16 ethertype, hdrlen,  meshhdrlen = 0;
	__le16 fc;
1809
	struct ieee80211_hdr hdr;
1810
	struct ieee80211s_hdr mesh_hdr __maybe_unused;
1811
	struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL;
1812 1813
	const u8 *encaps_data;
	int encaps_len, skip_header_bytes;
1814
	int nh_pos, h_pos;
1815
	struct sta_info *sta = NULL;
J
Johannes Berg 已提交
1816
	bool wme_sta = false, authorized = false, tdls_auth = false;
1817
	bool tdls_peer = false, tdls_setup_frame = false;
J
Johannes Berg 已提交
1818 1819 1820
	bool multicast;
	u32 info_flags = 0;
	u16 info_id = 0;
J
Johannes Berg 已提交
1821 1822 1823
	struct ieee80211_chanctx_conf *chanctx_conf;
	struct ieee80211_sub_if_data *ap_sdata;
	enum ieee80211_band band;
1824

1825
	if (unlikely(skb->len < ETH_HLEN))
1826 1827 1828 1829 1830
		goto fail;

	/* convert Ethernet header to proper 802.11 header (based on
	 * operation mode) */
	ethertype = (skb->data[12] << 8) | skb->data[13];
1831
	fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
1832

J
Johannes Berg 已提交
1833 1834
	rcu_read_lock();

1835 1836 1837
	/* Measure frame arrival for Tx latency statistics calculation */
	ieee80211_tx_latency_start_msrmnt(local, skb);

1838
	switch (sdata->vif.type) {
1839
	case NL80211_IFTYPE_AP_VLAN:
1840
		sta = rcu_dereference(sdata->u.vlan.sta);
1841 1842 1843 1844
		if (sta) {
			fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
			/* RA TA DA SA */
			memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN);
1845
			memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1846 1847 1848
			memcpy(hdr.addr3, skb->data, ETH_ALEN);
			memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
			hdrlen = 30;
J
Johannes Berg 已提交
1849
			authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1850
			wme_sta = sta->sta.wme;
1851
		}
J
Johannes Berg 已提交
1852 1853 1854 1855 1856
		ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
					u.ap);
		chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf);
		if (!chanctx_conf)
			goto fail_rcu;
1857
		band = chanctx_conf->def.chan->band;
1858 1859 1860 1861
		if (sta)
			break;
		/* fall through */
	case NL80211_IFTYPE_AP:
A
Arnd Bergmann 已提交
1862 1863 1864 1865
		if (sdata->vif.type == NL80211_IFTYPE_AP)
			chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
		if (!chanctx_conf)
			goto fail_rcu;
1866
		fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
1867 1868
		/* DA BSSID SA */
		memcpy(hdr.addr1, skb->data, ETH_ALEN);
1869
		memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1870 1871
		memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
		hdrlen = 24;
1872
		band = chanctx_conf->def.chan->band;
1873
		break;
1874
	case NL80211_IFTYPE_WDS:
1875
		fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1876 1877
		/* RA TA DA SA */
		memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
1878
		memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1879 1880 1881
		memcpy(hdr.addr3, skb->data, ETH_ALEN);
		memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
		hdrlen = 30;
J
Johannes Berg 已提交
1882 1883 1884 1885
		/*
		 * This is the exception! WDS style interfaces are prohibited
		 * when channel contexts are in used so this must be valid
		 */
1886
		band = local->hw.conf.chandef.chan->band;
1887
		break;
1888
#ifdef CONFIG_MAC80211_MESH
1889
	case NL80211_IFTYPE_MESH_POINT:
1890
		if (!is_multicast_ether_addr(skb->data)) {
1891 1892 1893
			struct sta_info *next_hop;
			bool mpp_lookup = true;

J
Johannes Berg 已提交
1894
			mpath = mesh_path_lookup(sdata, skb->data);
1895 1896 1897 1898 1899 1900 1901 1902 1903 1904
			if (mpath) {
				mpp_lookup = false;
				next_hop = rcu_dereference(mpath->next_hop);
				if (!next_hop ||
				    !(mpath->flags & (MESH_PATH_ACTIVE |
						      MESH_PATH_RESOLVING)))
					mpp_lookup = true;
			}

			if (mpp_lookup)
J
Johannes Berg 已提交
1905
				mppath = mpp_path_lookup(sdata, skb->data);
1906 1907 1908

			if (mppath && mpath)
				mesh_path_del(mpath->sdata, mpath->dst);
1909
		}
1910

1911
		/*
1912 1913 1914 1915
		 * Use address extension if it is a packet from
		 * another interface or if we know the destination
		 * is being proxied by a portal (i.e. portal address
		 * differs from proxied address)
1916
		 */
1917 1918
		if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) &&
		    !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) {
1919 1920
			hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
					skb->data, skb->data + ETH_ALEN);
J
Johannes Berg 已提交
1921 1922
			meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr,
							       NULL, NULL);
1923
		} else {
1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935
			/* DS -> MBSS (802.11-2012 13.11.3.3).
			 * For unicast with unknown forwarding information,
			 * destination might be in the MBSS or if that fails
			 * forwarded to another mesh gate. In either case
			 * resolution will be handled in ieee80211_xmit(), so
			 * leave the original DA. This also works for mcast */
			const u8 *mesh_da = skb->data;

			if (mppath)
				mesh_da = mppath->mpp;
			else if (mpath)
				mesh_da = mpath->dst;
1936

1937
			hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
1938
					mesh_da, sdata->vif.addr);
1939 1940
			if (is_multicast_ether_addr(mesh_da))
				/* DA TA mSA AE:SA */
J
Johannes Berg 已提交
1941 1942 1943
				meshhdrlen = ieee80211_new_mesh_header(
						sdata, &mesh_hdr,
						skb->data + ETH_ALEN, NULL);
1944
			else
1945
				/* RA TA mDA mSA AE:DA SA */
J
Johannes Berg 已提交
1946 1947 1948
				meshhdrlen = ieee80211_new_mesh_header(
						sdata, &mesh_hdr, skb->data,
						skb->data + ETH_ALEN);
1949 1950

		}
J
Johannes Berg 已提交
1951 1952 1953
		chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
		if (!chanctx_conf)
			goto fail_rcu;
1954
		band = chanctx_conf->def.chan->band;
1955 1956
		break;
#endif
1957
	case NL80211_IFTYPE_STATION:
1958 1959
		if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
			sta = sta_info_get(sdata, skb->data);
J
Johannes Berg 已提交
1960 1961 1962
			if (sta) {
				authorized = test_sta_flag(sta,
							WLAN_STA_AUTHORIZED);
1963
				wme_sta = sta->sta.wme;
J
Johannes Berg 已提交
1964
				tdls_peer = test_sta_flag(sta,
1965
							  WLAN_STA_TDLS_PEER);
J
Johannes Berg 已提交
1966 1967 1968
				tdls_auth = test_sta_flag(sta,
						WLAN_STA_TDLS_PEER_AUTH);
			}
1969

1970 1971 1972 1973 1974
			if (tdls_peer)
				tdls_setup_frame =
					ethertype == ETH_P_TDLS &&
					skb->len > 14 &&
					skb->data[14] == WLAN_TDLS_SNAP_RFTYPE;
1975 1976
		}

1977 1978 1979 1980 1981 1982 1983 1984
		/*
		 * TDLS link during setup - throw out frames to peer. We allow
		 * TDLS-setup frames to unauthorized peers for the special case
		 * of a link teardown after a TDLS sta is removed due to being
		 * unreachable.
		 */
		if (tdls_peer && !tdls_auth && !tdls_setup_frame)
			goto fail_rcu;
1985

1986 1987
		/* send direct packets to authorized TDLS peers */
		if (tdls_peer && tdls_auth) {
1988 1989 1990 1991 1992 1993 1994 1995 1996
			/* DA SA BSSID */
			memcpy(hdr.addr1, skb->data, ETH_ALEN);
			memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
			memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN);
			hdrlen = 24;
		}  else if (sdata->u.mgd.use_4addr &&
			    cpu_to_be16(ethertype) != sdata->control_port_protocol) {
			fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
					  IEEE80211_FCTL_TODS);
1997
			/* RA TA DA SA */
1998
			memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
1999
			memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2000 2001 2002 2003 2004 2005
			memcpy(hdr.addr3, skb->data, ETH_ALEN);
			memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
			hdrlen = 30;
		} else {
			fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
			/* BSSID SA DA */
2006
			memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
2007 2008 2009 2010
			memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
			memcpy(hdr.addr3, skb->data, ETH_ALEN);
			hdrlen = 24;
		}
J
Johannes Berg 已提交
2011 2012 2013
		chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
		if (!chanctx_conf)
			goto fail_rcu;
2014
		band = chanctx_conf->def.chan->band;
2015
		break;
2016
	case NL80211_IFTYPE_ADHOC:
2017 2018 2019
		/* DA SA BSSID */
		memcpy(hdr.addr1, skb->data, ETH_ALEN);
		memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2020
		memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN);
2021
		hdrlen = 24;
J
Johannes Berg 已提交
2022 2023 2024
		chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
		if (!chanctx_conf)
			goto fail_rcu;
2025
		band = chanctx_conf->def.chan->band;
2026 2027
		break;
	default:
J
Johannes Berg 已提交
2028
		goto fail_rcu;
2029 2030
	}

2031 2032 2033 2034 2035
	/*
	 * There's no need to try to look up the destination
	 * if it is a multicast address (which can only happen
	 * in AP mode)
	 */
J
Johannes Berg 已提交
2036 2037
	multicast = is_multicast_ether_addr(hdr.addr1);
	if (!multicast) {
2038
		sta = sta_info_get(sdata, hdr.addr1);
J
Johannes Berg 已提交
2039 2040
		if (sta) {
			authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
2041
			wme_sta = sta->sta.wme;
J
Johannes Berg 已提交
2042
		}
2043 2044
	}

2045 2046
	/* For mesh, the use of the QoS header is mandatory */
	if (ieee80211_vif_is_mesh(&sdata->vif))
J
Johannes Berg 已提交
2047
		wme_sta = true;
2048

2049
	/* receiver and we are QoS enabled, use a QoS type frame */
J
Johannes Berg 已提交
2050
	if (wme_sta && local->hw.queues >= IEEE80211_NUM_ACS) {
2051
		fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
2052 2053 2054 2055
		hdrlen += 2;
	}

	/*
2056 2057
	 * Drop unicast frames to unauthorised stations unless they are
	 * EAPOL frames from the local station.
2058
	 */
2059
	if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) &&
2060
		     !multicast && !authorized &&
2061
		     (cpu_to_be16(ethertype) != sdata->control_port_protocol ||
2062
		      !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) {
2063
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
J
Johannes Berg 已提交
2064
		net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n",
2065
				    dev->name, hdr.addr1);
2066 2067 2068 2069
#endif

		I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);

J
Johannes Berg 已提交
2070
		goto fail_rcu;
2071 2072
	}

J
Johannes Berg 已提交
2073 2074
	if (unlikely(!multicast && skb->sk &&
		     skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) {
2075
		struct sk_buff *ack_skb = skb_clone_sk(skb);
J
Johannes Berg 已提交
2076

2077
		if (ack_skb) {
J
Johannes Berg 已提交
2078
			unsigned long flags;
T
Tejun Heo 已提交
2079
			int id;
J
Johannes Berg 已提交
2080 2081

			spin_lock_irqsave(&local->ack_status_lock, flags);
2082
			id = idr_alloc(&local->ack_status_frames, ack_skb,
T
Tejun Heo 已提交
2083
				       1, 0x10000, GFP_ATOMIC);
J
Johannes Berg 已提交
2084 2085
			spin_unlock_irqrestore(&local->ack_status_lock, flags);

T
Tejun Heo 已提交
2086
			if (id >= 0) {
J
Johannes Berg 已提交
2087 2088 2089
				info_id = id;
				info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
			} else {
2090
				kfree_skb(ack_skb);
J
Johannes Berg 已提交
2091 2092 2093 2094
			}
		}
	}

2095 2096 2097 2098
	/*
	 * If the skb is shared we need to obtain our own copy.
	 */
	if (skb_shared(skb)) {
J
Johannes Berg 已提交
2099 2100 2101 2102 2103
		struct sk_buff *tmp_skb = skb;

		/* can't happen -- skb is a clone if info_id != 0 */
		WARN_ON(info_id);

2104
		skb = skb_clone(skb, GFP_ATOMIC);
2105 2106
		kfree_skb(tmp_skb);

2107
		if (!skb)
J
Johannes Berg 已提交
2108
			goto fail_rcu;
2109 2110
	}

2111
	hdr.frame_control = fc;
2112 2113 2114 2115 2116 2117 2118 2119
	hdr.duration_id = 0;
	hdr.seq_ctrl = 0;

	skip_header_bytes = ETH_HLEN;
	if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
		encaps_data = bridge_tunnel_header;
		encaps_len = sizeof(bridge_tunnel_header);
		skip_header_bytes -= 2;
S
Simon Horman 已提交
2120
	} else if (ethertype >= ETH_P_802_3_MIN) {
2121 2122 2123 2124 2125 2126 2127 2128
		encaps_data = rfc1042_header;
		encaps_len = sizeof(rfc1042_header);
		skip_header_bytes -= 2;
	} else {
		encaps_data = NULL;
		encaps_len = 0;
	}

2129 2130 2131
	nh_pos = skb_network_header(skb) - skb->data;
	h_pos = skb_transport_header(skb) - skb->data;

2132 2133 2134 2135
	skb_pull(skb, skip_header_bytes);
	nh_pos -= skip_header_bytes;
	h_pos -= skip_header_bytes;

2136
	head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
2137

2138 2139 2140 2141 2142 2143 2144 2145 2146 2147 2148
	/*
	 * So we need to modify the skb header and hence need a copy of
	 * that. The head_need variable above doesn't, so far, include
	 * the needed header space that we don't need right away. If we
	 * can, then we don't reallocate right now but only after the
	 * frame arrives at the master device (if it does...)
	 *
	 * If we cannot, however, then we will reallocate to include all
	 * the ever needed space. Also, if we need to reallocate it anyway,
	 * make it big enough for everything we may ever need.
	 */
2149

2150
	if (head_need > 0 || skb_cloned(skb)) {
2151
		head_need += sdata->encrypt_headroom;
2152 2153
		head_need += local->tx_headroom;
		head_need = max_t(int, 0, head_need);
2154 2155
		if (ieee80211_skb_resize(sdata, skb, head_need, true)) {
			ieee80211_free_txskb(&local->hw, skb);
J
Johannes Berg 已提交
2156
			skb = NULL;
J
Johannes Berg 已提交
2157
			goto fail_rcu;
2158
		}
2159 2160 2161 2162 2163 2164 2165
	}

	if (encaps_data) {
		memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
		nh_pos += encaps_len;
		h_pos += encaps_len;
	}
2166

2167
#ifdef CONFIG_MAC80211_MESH
2168 2169 2170 2171 2172
	if (meshhdrlen > 0) {
		memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
		nh_pos += meshhdrlen;
		h_pos += meshhdrlen;
	}
2173
#endif
2174

2175
	if (ieee80211_is_data_qos(fc)) {
2176 2177
		__le16 *qos_control;

W
Weilong Chen 已提交
2178
		qos_control = (__le16 *) skb_push(skb, 2);
2179 2180 2181 2182 2183 2184 2185 2186 2187
		memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
		/*
		 * Maybe we could actually set some fields here, for now just
		 * initialise to zero to indicate no special operation.
		 */
		*qos_control = 0;
	} else
		memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);

2188 2189 2190
	nh_pos += hdrlen;
	h_pos += hdrlen;

2191 2192
	dev->stats.tx_packets++;
	dev->stats.tx_bytes += skb->len;
2193 2194 2195 2196 2197 2198 2199 2200

	/* Update skb pointers to various headers since this modified frame
	 * is going to go through Linux networking code that may potentially
	 * need things like pointer to IP header. */
	skb_set_mac_header(skb, 0);
	skb_set_network_header(skb, nh_pos);
	skb_set_transport_header(skb, h_pos);

2201
	info = IEEE80211_SKB_CB(skb);
J
Johannes Berg 已提交
2202 2203
	memset(info, 0, sizeof(*info));

2204
	dev->trans_start = jiffies;
J
Johannes Berg 已提交
2205 2206 2207 2208

	info->flags = info_flags;
	info->ack_frame_id = info_id;

J
Johannes Berg 已提交
2209 2210
	ieee80211_xmit(sdata, skb, band);
	rcu_read_unlock();
2211

2212
	return NETDEV_TX_OK;
2213

J
Johannes Berg 已提交
2214 2215
 fail_rcu:
	rcu_read_unlock();
2216
 fail:
2217 2218
	dev_kfree_skb(skb);
	return NETDEV_TX_OK;
2219 2220 2221
}


2222 2223 2224 2225
/*
 * ieee80211_clear_tx_pending may not be called in a context where
 * it is possible that it packets could come in again.
 */
2226 2227
void ieee80211_clear_tx_pending(struct ieee80211_local *local)
{
2228
	struct sk_buff *skb;
J
Johannes Berg 已提交
2229
	int i;
2230

2231 2232 2233 2234
	for (i = 0; i < local->hw.queues; i++) {
		while ((skb = skb_dequeue(&local->pending[i])) != NULL)
			ieee80211_free_txskb(&local->hw, skb);
	}
2235 2236
}

2237 2238 2239 2240 2241
/*
 * Returns false if the frame couldn't be transmitted but was queued instead,
 * which in this case means re-queued -- take as an indication to stop sending
 * more pending frames.
 */
2242 2243 2244 2245 2246 2247 2248
static bool ieee80211_tx_pending_skb(struct ieee80211_local *local,
				     struct sk_buff *skb)
{
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
	struct ieee80211_sub_if_data *sdata;
	struct sta_info *sta;
	struct ieee80211_hdr *hdr;
2249
	bool result;
J
Johannes Berg 已提交
2250
	struct ieee80211_chanctx_conf *chanctx_conf;
2251

2252
	sdata = vif_to_sdata(info->control.vif);
2253 2254

	if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) {
J
Johannes Berg 已提交
2255 2256 2257 2258 2259 2260
		chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
		if (unlikely(!chanctx_conf)) {
			dev_kfree_skb(skb);
			return true;
		}
		result = ieee80211_tx(sdata, skb, true,
2261
				      chanctx_conf->def.chan->band);
2262
	} else {
2263 2264 2265 2266 2267
		struct sk_buff_head skbs;

		__skb_queue_head_init(&skbs);
		__skb_queue_tail(&skbs, skb);

2268
		hdr = (struct ieee80211_hdr *)skb->data;
2269
		sta = sta_info_get(sdata, hdr->addr1);
2270

2271
		result = __ieee80211_tx(local, &skbs, skb->len, sta, true);
2272 2273 2274 2275 2276
	}

	return result;
}

2277
/*
J
Johannes Berg 已提交
2278
 * Transmit all pending packets. Called from tasklet.
2279
 */
2280 2281 2282
void ieee80211_tx_pending(unsigned long data)
{
	struct ieee80211_local *local = (struct ieee80211_local *)data;
2283
	unsigned long flags;
2284
	int i;
J
Johannes Berg 已提交
2285
	bool txok;
2286

2287
	rcu_read_lock();
2288

J
Johannes Berg 已提交
2289
	spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
2290 2291 2292 2293 2294
	for (i = 0; i < local->hw.queues; i++) {
		/*
		 * If queue is stopped by something other than due to pending
		 * frames, or we have no pending frames, proceed to next queue.
		 */
J
Johannes Berg 已提交
2295
		if (local->queue_stop_reasons[i] ||
2296
		    skb_queue_empty(&local->pending[i]))
2297
			continue;
2298

2299
		while (!skb_queue_empty(&local->pending[i])) {
J
Johannes Berg 已提交
2300
			struct sk_buff *skb = __skb_dequeue(&local->pending[i]);
2301 2302
			struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);

2303
			if (WARN_ON(!info->control.vif)) {
2304
				ieee80211_free_txskb(&local->hw, skb);
2305 2306 2307
				continue;
			}

J
Johannes Berg 已提交
2308 2309 2310 2311 2312 2313 2314
			spin_unlock_irqrestore(&local->queue_stop_reason_lock,
						flags);

			txok = ieee80211_tx_pending_skb(local, skb);
			spin_lock_irqsave(&local->queue_stop_reason_lock,
					  flags);
			if (!txok)
2315
				break;
2316
		}
2317 2318

		if (skb_queue_empty(&local->pending[i]))
2319
			ieee80211_propagate_queue_wake(local, i);
2320
	}
J
Johannes Berg 已提交
2321
	spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
2322

2323
	rcu_read_unlock();
2324 2325 2326 2327
}

/* functions for drivers to get certain frames */

2328
static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
2329 2330
				       struct ps_data *ps, struct sk_buff *skb,
				       bool is_template)
2331 2332 2333 2334 2335 2336 2337
{
	u8 *pos, *tim;
	int aid0 = 0;
	int i, have_bits = 0, n1, n2;

	/* Generate bitmap for TIM only if there are any STAs in power save
	 * mode. */
2338
	if (atomic_read(&ps->num_sta_ps) > 0)
2339 2340
		/* in the hope that this is faster than
		 * checking byte-for-byte */
W
Weilong Chen 已提交
2341
		have_bits = !bitmap_empty((unsigned long *)ps->tim,
2342
					  IEEE80211_MAX_AID+1);
2343 2344 2345 2346 2347 2348
	if (!is_template) {
		if (ps->dtim_count == 0)
			ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1;
		else
			ps->dtim_count--;
	}
2349 2350 2351 2352

	tim = pos = (u8 *) skb_put(skb, 6);
	*pos++ = WLAN_EID_TIM;
	*pos++ = 4;
2353
	*pos++ = ps->dtim_count;
2354
	*pos++ = sdata->vif.bss_conf.dtim_period;
2355

2356
	if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf))
2357 2358
		aid0 = 1;

2359
	ps->dtim_bc_mc = aid0 == 1;
2360

2361 2362 2363 2364 2365 2366
	if (have_bits) {
		/* Find largest even number N1 so that bits numbered 1 through
		 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
		 * (N2 + 1) x 8 through 2007 are 0. */
		n1 = 0;
		for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
2367
			if (ps->tim[i]) {
2368 2369 2370 2371 2372 2373
				n1 = i & 0xfe;
				break;
			}
		}
		n2 = n1;
		for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
2374
			if (ps->tim[i]) {
2375 2376 2377 2378 2379 2380 2381 2382
				n2 = i;
				break;
			}
		}

		/* Bitmap control */
		*pos++ = n1 | aid0;
		/* Part Virt Bitmap */
2383
		skb_put(skb, n2 - n1);
2384
		memcpy(pos, ps->tim + n1, n2 - n1 + 1);
2385 2386 2387 2388 2389 2390 2391 2392

		tim[1] = n2 - n1 + 4;
	} else {
		*pos++ = aid0; /* Bitmap control */
		*pos++ = 0; /* Part Virt Bitmap */
	}
}

2393
static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
2394 2395
				    struct ps_data *ps, struct sk_buff *skb,
				    bool is_template)
2396 2397 2398 2399 2400 2401 2402 2403 2404 2405 2406
{
	struct ieee80211_local *local = sdata->local;

	/*
	 * Not very nice, but we want to allow the driver to call
	 * ieee80211_beacon_get() as a response to the set_tim()
	 * callback. That, however, is already invoked under the
	 * sta_lock to guarantee consistent and race-free update
	 * of the tim bitmap in mac80211 and the driver.
	 */
	if (local->tim_in_locked_section) {
2407
		__ieee80211_beacon_add_tim(sdata, ps, skb, is_template);
2408
	} else {
J
Johannes Berg 已提交
2409
		spin_lock_bh(&local->tim_lock);
2410
		__ieee80211_beacon_add_tim(sdata, ps, skb, is_template);
J
Johannes Berg 已提交
2411
		spin_unlock_bh(&local->tim_lock);
2412 2413 2414 2415 2416
	}

	return 0;
}

2417 2418
static void ieee80211_set_csa(struct ieee80211_sub_if_data *sdata,
			      struct beacon_data *beacon)
2419 2420
{
	struct probe_resp *resp;
2421 2422
	u8 *beacon_data;
	size_t beacon_data_len;
2423
	int i;
2424
	u8 count = beacon->csa_current_counter;
2425 2426 2427 2428 2429 2430 2431 2432 2433 2434

	switch (sdata->vif.type) {
	case NL80211_IFTYPE_AP:
		beacon_data = beacon->tail;
		beacon_data_len = beacon->tail_len;
		break;
	case NL80211_IFTYPE_ADHOC:
		beacon_data = beacon->head;
		beacon_data_len = beacon->head_len;
		break;
2435 2436 2437 2438
	case NL80211_IFTYPE_MESH_POINT:
		beacon_data = beacon->head;
		beacon_data_len = beacon->head_len;
		break;
2439 2440 2441
	default:
		return;
	}
2442

2443
	rcu_read_lock();
2444
	for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; ++i) {
2445
		resp = rcu_dereference(sdata->u.ap.probe_resp);
2446

2447 2448 2449
		if (beacon->csa_counter_offsets[i]) {
			if (WARN_ON_ONCE(beacon->csa_counter_offsets[i] >=
					 beacon_data_len)) {
2450 2451 2452
				rcu_read_unlock();
				return;
			}
2453 2454

			beacon_data[beacon->csa_counter_offsets[i]] = count;
2455
		}
2456 2457 2458

		if (sdata->vif.type == NL80211_IFTYPE_AP && resp)
			resp->data[resp->csa_counter_offsets[i]] = count;
2459
	}
2460
	rcu_read_unlock();
2461 2462 2463 2464 2465
}

u8 ieee80211_csa_update_counter(struct ieee80211_vif *vif)
{
	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2466 2467
	struct beacon_data *beacon = NULL;
	u8 count = 0;
2468

2469 2470 2471 2472 2473 2474 2475 2476 2477 2478 2479 2480 2481
	rcu_read_lock();

	if (sdata->vif.type == NL80211_IFTYPE_AP)
		beacon = rcu_dereference(sdata->u.ap.beacon);
	else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
		beacon = rcu_dereference(sdata->u.ibss.presp);
	else if (ieee80211_vif_is_mesh(&sdata->vif))
		beacon = rcu_dereference(sdata->u.mesh.beacon);

	if (!beacon)
		goto unlock;

	beacon->csa_current_counter--;
2482 2483

	/* the counter should never reach 0 */
2484 2485
	WARN_ON_ONCE(!beacon->csa_current_counter);
	count = beacon->csa_current_counter;
2486

2487 2488 2489
unlock:
	rcu_read_unlock();
	return count;
2490
}
2491
EXPORT_SYMBOL(ieee80211_csa_update_counter);
2492 2493 2494 2495 2496 2497 2498 2499 2500 2501 2502 2503 2504 2505 2506 2507 2508 2509 2510 2511 2512

bool ieee80211_csa_is_complete(struct ieee80211_vif *vif)
{
	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
	struct beacon_data *beacon = NULL;
	u8 *beacon_data;
	size_t beacon_data_len;
	int ret = false;

	if (!ieee80211_sdata_running(sdata))
		return false;

	rcu_read_lock();
	if (vif->type == NL80211_IFTYPE_AP) {
		struct ieee80211_if_ap *ap = &sdata->u.ap;

		beacon = rcu_dereference(ap->beacon);
		if (WARN_ON(!beacon || !beacon->tail))
			goto out;
		beacon_data = beacon->tail;
		beacon_data_len = beacon->tail_len;
2513 2514 2515 2516 2517 2518 2519
	} else if (vif->type == NL80211_IFTYPE_ADHOC) {
		struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;

		beacon = rcu_dereference(ifibss->presp);
		if (!beacon)
			goto out;

2520 2521 2522 2523 2524 2525 2526 2527 2528
		beacon_data = beacon->head;
		beacon_data_len = beacon->head_len;
	} else if (vif->type == NL80211_IFTYPE_MESH_POINT) {
		struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;

		beacon = rcu_dereference(ifmsh->beacon);
		if (!beacon)
			goto out;

2529 2530
		beacon_data = beacon->head;
		beacon_data_len = beacon->head_len;
2531 2532 2533 2534 2535
	} else {
		WARN_ON(1);
		goto out;
	}

2536 2537 2538
	if (!beacon->csa_counter_offsets[0])
		goto out;

2539
	if (WARN_ON_ONCE(beacon->csa_counter_offsets[0] > beacon_data_len))
2540 2541
		goto out;

2542
	if (beacon_data[beacon->csa_counter_offsets[0]] == 1)
2543 2544 2545 2546 2547 2548 2549 2550
		ret = true;
 out:
	rcu_read_unlock();

	return ret;
}
EXPORT_SYMBOL(ieee80211_csa_is_complete);

2551 2552 2553 2554 2555
static struct sk_buff *
__ieee80211_beacon_get(struct ieee80211_hw *hw,
		       struct ieee80211_vif *vif,
		       struct ieee80211_mutable_offsets *offs,
		       bool is_template)
2556 2557
{
	struct ieee80211_local *local = hw_to_local(hw);
2558
	struct beacon_data *beacon = NULL;
2559
	struct sk_buff *skb = NULL;
2560
	struct ieee80211_tx_info *info;
2561
	struct ieee80211_sub_if_data *sdata = NULL;
J
Johannes Berg 已提交
2562
	enum ieee80211_band band;
2563
	struct ieee80211_tx_rate_control txrc;
J
Johannes Berg 已提交
2564
	struct ieee80211_chanctx_conf *chanctx_conf;
2565
	int csa_off_base = 0;
2566

2567
	rcu_read_lock();
2568

2569
	sdata = vif_to_sdata(vif);
J
Johannes Berg 已提交
2570
	chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2571

J
Johannes Berg 已提交
2572
	if (!ieee80211_sdata_running(sdata) || !chanctx_conf)
2573 2574
		goto out;

2575 2576
	if (offs)
		memset(offs, 0, sizeof(*offs));
2577

2578
	if (sdata->vif.type == NL80211_IFTYPE_AP) {
2579 2580
		struct ieee80211_if_ap *ap = &sdata->u.ap;

2581
		beacon = rcu_dereference(ap->beacon);
D
Dan Carpenter 已提交
2582
		if (beacon) {
2583
			if (beacon->csa_counter_offsets[0]) {
2584 2585 2586 2587 2588
				if (!is_template)
					ieee80211_csa_update_counter(vif);

				ieee80211_set_csa(sdata, beacon);
			}
2589

J
Johannes Berg 已提交
2590 2591 2592 2593 2594 2595
			/*
			 * headroom, head length,
			 * tail length and maximum TIM length
			 */
			skb = dev_alloc_skb(local->tx_headroom +
					    beacon->head_len +
2596 2597
					    beacon->tail_len + 256 +
					    local->hw.extra_beacon_tailroom);
J
Johannes Berg 已提交
2598 2599
			if (!skb)
				goto out;
2600

J
Johannes Berg 已提交
2601 2602 2603
			skb_reserve(skb, local->tx_headroom);
			memcpy(skb_put(skb, beacon->head_len), beacon->head,
			       beacon->head_len);
2604

2605 2606
			ieee80211_beacon_add_tim(sdata, &ap->ps, skb,
						 is_template);
2607

2608 2609 2610
			if (offs) {
				offs->tim_offset = beacon->head_len;
				offs->tim_length = skb->len - beacon->head_len;
2611 2612 2613

				/* for AP the csa offsets are from tail */
				csa_off_base = skb->len;
2614
			}
2615

J
Johannes Berg 已提交
2616 2617 2618
			if (beacon->tail)
				memcpy(skb_put(skb, beacon->tail_len),
				       beacon->tail, beacon->tail_len);
2619 2620
		} else
			goto out;
2621
	} else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
2622
		struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
2623
		struct ieee80211_hdr *hdr;
2624

2625 2626
		beacon = rcu_dereference(ifibss->presp);
		if (!beacon)
2627 2628
			goto out;

2629
		if (beacon->csa_counter_offsets[0]) {
2630 2631
			if (!is_template)
				ieee80211_csa_update_counter(vif);
2632

2633
			ieee80211_set_csa(sdata, beacon);
2634
		}
2635

2636
		skb = dev_alloc_skb(local->tx_headroom + beacon->head_len +
2637
				    local->hw.extra_beacon_tailroom);
2638 2639
		if (!skb)
			goto out;
2640
		skb_reserve(skb, local->tx_headroom);
2641 2642
		memcpy(skb_put(skb, beacon->head_len), beacon->head,
		       beacon->head_len);
2643 2644

		hdr = (struct ieee80211_hdr *) skb->data;
2645 2646
		hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
						 IEEE80211_STYPE_BEACON);
J
Johannes Berg 已提交
2647
	} else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2648
		struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2649

2650 2651
		beacon = rcu_dereference(ifmsh->beacon);
		if (!beacon)
2652 2653
			goto out;

2654
		if (beacon->csa_counter_offsets[0]) {
2655 2656 2657 2658 2659 2660 2661 2662
			if (!is_template)
				/* TODO: For mesh csa_counter is in TU, so
				 * decrementing it by one isn't correct, but
				 * for now we leave it consistent with overall
				 * mac80211's behavior.
				 */
				ieee80211_csa_update_counter(vif);

2663
			ieee80211_set_csa(sdata, beacon);
2664
		}
2665

2666
		if (ifmsh->sync_ops)
2667
			ifmsh->sync_ops->adjust_tbtt(sdata, beacon);
2668

2669
		skb = dev_alloc_skb(local->tx_headroom +
2670
				    beacon->head_len +
M
Marco Porsch 已提交
2671
				    256 + /* TIM IE */
2672
				    beacon->tail_len +
2673
				    local->hw.extra_beacon_tailroom);
J
Johannes Berg 已提交
2674 2675
		if (!skb)
			goto out;
T
Thomas Pedersen 已提交
2676
		skb_reserve(skb, local->tx_headroom);
2677 2678
		memcpy(skb_put(skb, beacon->head_len), beacon->head,
		       beacon->head_len);
2679 2680 2681
		ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb, is_template);

		if (offs) {
2682 2683
			offs->tim_offset = beacon->head_len;
			offs->tim_length = skb->len - beacon->head_len;
2684 2685
		}

2686 2687
		memcpy(skb_put(skb, beacon->tail_len), beacon->tail,
		       beacon->tail_len);
2688 2689
	} else {
		WARN_ON(1);
2690
		goto out;
2691 2692
	}

2693
	/* CSA offsets */
2694
	if (offs && beacon) {
2695 2696 2697
		int i;

		for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; i++) {
2698
			u16 csa_off = beacon->csa_counter_offsets[i];
2699 2700 2701 2702 2703 2704 2705 2706

			if (!csa_off)
				continue;

			offs->csa_counter_offs[i] = csa_off_base + csa_off;
		}
	}

2707
	band = chanctx_conf->def.chan->band;
J
Johannes Berg 已提交
2708

2709 2710
	info = IEEE80211_SKB_CB(skb);

J
Johannes Berg 已提交
2711
	info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
2712
	info->flags |= IEEE80211_TX_CTL_NO_ACK;
2713
	info->band = band;
2714 2715 2716

	memset(&txrc, 0, sizeof(txrc));
	txrc.hw = hw;
2717
	txrc.sband = local->hw.wiphy->bands[band];
2718 2719 2720
	txrc.bss_conf = &sdata->vif.bss_conf;
	txrc.skb = skb;
	txrc.reported_rate.idx = -1;
2721
	txrc.rate_idx_mask = sdata->rc_rateidx_mask[band];
2722
	if (txrc.rate_idx_mask == (1 << txrc.sband->n_bitrates) - 1)
2723 2724 2725
		txrc.max_rate_idx = -1;
	else
		txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
2726
	txrc.bss = true;
2727
	rate_control_get_rate(sdata, NULL, &txrc);
2728 2729

	info->control.vif = vif;
2730

2731 2732 2733
	info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT |
			IEEE80211_TX_CTL_ASSIGN_SEQ |
			IEEE80211_TX_CTL_FIRST_FRAGMENT;
2734
 out:
2735
	rcu_read_unlock();
2736
	return skb;
2737 2738 2739 2740 2741 2742 2743 2744 2745 2746 2747 2748 2749 2750 2751 2752 2753 2754 2755 2756 2757 2758 2759 2760 2761 2762

}

struct sk_buff *
ieee80211_beacon_get_template(struct ieee80211_hw *hw,
			      struct ieee80211_vif *vif,
			      struct ieee80211_mutable_offsets *offs)
{
	return __ieee80211_beacon_get(hw, vif, offs, true);
}
EXPORT_SYMBOL(ieee80211_beacon_get_template);

struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
					 struct ieee80211_vif *vif,
					 u16 *tim_offset, u16 *tim_length)
{
	struct ieee80211_mutable_offsets offs = {};
	struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false);

	if (tim_offset)
		*tim_offset = offs.tim_offset;

	if (tim_length)
		*tim_length = offs.tim_length;

	return bcn;
2763
}
2764
EXPORT_SYMBOL(ieee80211_beacon_get_tim);
2765

2766 2767 2768 2769
struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw,
					struct ieee80211_vif *vif)
{
	struct ieee80211_if_ap *ap = NULL;
2770 2771
	struct sk_buff *skb = NULL;
	struct probe_resp *presp = NULL;
2772 2773 2774 2775 2776 2777 2778 2779 2780 2781 2782 2783 2784
	struct ieee80211_hdr *hdr;
	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);

	if (sdata->vif.type != NL80211_IFTYPE_AP)
		return NULL;

	rcu_read_lock();

	ap = &sdata->u.ap;
	presp = rcu_dereference(ap->probe_resp);
	if (!presp)
		goto out;

2785
	skb = dev_alloc_skb(presp->len);
2786 2787 2788
	if (!skb)
		goto out;

2789 2790
	memcpy(skb_put(skb, presp->len), presp->data, presp->len);

2791 2792 2793 2794 2795 2796 2797 2798 2799
	hdr = (struct ieee80211_hdr *) skb->data;
	memset(hdr->addr1, 0, sizeof(hdr->addr1));

out:
	rcu_read_unlock();
	return skb;
}
EXPORT_SYMBOL(ieee80211_proberesp_get);

2800 2801 2802 2803 2804 2805 2806 2807 2808 2809 2810 2811 2812 2813 2814 2815 2816
struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw,
				     struct ieee80211_vif *vif)
{
	struct ieee80211_sub_if_data *sdata;
	struct ieee80211_if_managed *ifmgd;
	struct ieee80211_pspoll *pspoll;
	struct ieee80211_local *local;
	struct sk_buff *skb;

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

	sdata = vif_to_sdata(vif);
	ifmgd = &sdata->u.mgd;
	local = sdata->local;

	skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
2817
	if (!skb)
2818
		return NULL;
2819

2820 2821 2822 2823 2824 2825 2826 2827 2828 2829 2830 2831 2832 2833 2834 2835 2836 2837 2838 2839 2840 2841 2842 2843 2844 2845 2846 2847 2848 2849 2850 2851 2852 2853 2854
	skb_reserve(skb, local->hw.extra_tx_headroom);

	pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll));
	memset(pspoll, 0, sizeof(*pspoll));
	pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
					    IEEE80211_STYPE_PSPOLL);
	pspoll->aid = cpu_to_le16(ifmgd->aid);

	/* aid in PS-Poll has its two MSBs each set to 1 */
	pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);

	memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
	memcpy(pspoll->ta, vif->addr, ETH_ALEN);

	return skb;
}
EXPORT_SYMBOL(ieee80211_pspoll_get);

struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw,
				       struct ieee80211_vif *vif)
{
	struct ieee80211_hdr_3addr *nullfunc;
	struct ieee80211_sub_if_data *sdata;
	struct ieee80211_if_managed *ifmgd;
	struct ieee80211_local *local;
	struct sk_buff *skb;

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

	sdata = vif_to_sdata(vif);
	ifmgd = &sdata->u.mgd;
	local = sdata->local;

	skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*nullfunc));
2855
	if (!skb)
2856
		return NULL;
2857

2858 2859 2860 2861 2862 2863 2864 2865 2866 2867 2868 2869 2870 2871 2872 2873
	skb_reserve(skb, local->hw.extra_tx_headroom);

	nullfunc = (struct ieee80211_hdr_3addr *) skb_put(skb,
							  sizeof(*nullfunc));
	memset(nullfunc, 0, sizeof(*nullfunc));
	nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA |
					      IEEE80211_STYPE_NULLFUNC |
					      IEEE80211_FCTL_TODS);
	memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN);
	memcpy(nullfunc->addr2, vif->addr, ETH_ALEN);
	memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN);

	return skb;
}
EXPORT_SYMBOL(ieee80211_nullfunc_get);

2874 2875 2876
struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw,
				       struct ieee80211_vif *vif,
				       const u8 *ssid, size_t ssid_len,
2877
				       size_t tailroom)
2878 2879 2880 2881 2882 2883 2884 2885 2886 2887 2888 2889 2890
{
	struct ieee80211_sub_if_data *sdata;
	struct ieee80211_local *local;
	struct ieee80211_hdr_3addr *hdr;
	struct sk_buff *skb;
	size_t ie_ssid_len;
	u8 *pos;

	sdata = vif_to_sdata(vif);
	local = sdata->local;
	ie_ssid_len = 2 + ssid_len;

	skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) +
2891
			    ie_ssid_len + tailroom);
2892
	if (!skb)
2893 2894 2895 2896 2897 2898 2899 2900
		return NULL;

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

	hdr = (struct ieee80211_hdr_3addr *) skb_put(skb, sizeof(*hdr));
	memset(hdr, 0, sizeof(*hdr));
	hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
					 IEEE80211_STYPE_PROBE_REQ);
J
Johannes Berg 已提交
2901
	eth_broadcast_addr(hdr->addr1);
2902
	memcpy(hdr->addr2, vif->addr, ETH_ALEN);
J
Johannes Berg 已提交
2903
	eth_broadcast_addr(hdr->addr3);
2904 2905 2906 2907

	pos = skb_put(skb, ie_ssid_len);
	*pos++ = WLAN_EID_SSID;
	*pos++ = ssid_len;
2908
	if (ssid_len)
2909 2910 2911 2912 2913 2914 2915
		memcpy(pos, ssid, ssid_len);
	pos += ssid_len;

	return skb;
}
EXPORT_SYMBOL(ieee80211_probereq_get);

2916
void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
2917
		       const void *frame, size_t frame_len,
2918
		       const struct ieee80211_tx_info *frame_txctl,
2919 2920 2921 2922
		       struct ieee80211_rts *rts)
{
	const struct ieee80211_hdr *hdr = frame;

2923 2924
	rts->frame_control =
	    cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
2925 2926
	rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
					       frame_txctl);
2927 2928 2929 2930 2931
	memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
	memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
}
EXPORT_SYMBOL(ieee80211_rts_get);

2932
void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
2933
			     const void *frame, size_t frame_len,
2934
			     const struct ieee80211_tx_info *frame_txctl,
2935 2936 2937 2938
			     struct ieee80211_cts *cts)
{
	const struct ieee80211_hdr *hdr = frame;

2939 2940
	cts->frame_control =
	    cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
2941 2942
	cts->duration = ieee80211_ctstoself_duration(hw, vif,
						     frame_len, frame_txctl);
2943 2944 2945 2946 2947
	memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
}
EXPORT_SYMBOL(ieee80211_ctstoself_get);

struct sk_buff *
2948
ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
2949
			  struct ieee80211_vif *vif)
2950 2951
{
	struct ieee80211_local *local = hw_to_local(hw);
2952
	struct sk_buff *skb = NULL;
2953
	struct ieee80211_tx_data tx;
2954
	struct ieee80211_sub_if_data *sdata;
2955
	struct ps_data *ps;
2956
	struct ieee80211_tx_info *info;
J
Johannes Berg 已提交
2957
	struct ieee80211_chanctx_conf *chanctx_conf;
2958

2959
	sdata = vif_to_sdata(vif);
2960 2961

	rcu_read_lock();
J
Johannes Berg 已提交
2962
	chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2963

2964 2965 2966 2967 2968 2969 2970 2971 2972 2973 2974
	if (!chanctx_conf)
		goto out;

	if (sdata->vif.type == NL80211_IFTYPE_AP) {
		struct beacon_data *beacon =
				rcu_dereference(sdata->u.ap.beacon);

		if (!beacon || !beacon->head)
			goto out;

		ps = &sdata->u.ap.ps;
M
Marco Porsch 已提交
2975 2976
	} else if (ieee80211_vif_is_mesh(&sdata->vif)) {
		ps = &sdata->u.mesh.ps;
2977
	} else {
2978
		goto out;
2979
	}
2980

2981
	if (ps->dtim_count != 0 || !ps->dtim_bc_mc)
2982
		goto out; /* send buffered bc/mc only after DTIM beacon */
2983

2984
	while (1) {
2985
		skb = skb_dequeue(&ps->bc_buf);
2986
		if (!skb)
2987
			goto out;
2988 2989
		local->total_ps_buffered--;

2990
		if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) {
2991 2992 2993 2994 2995 2996 2997 2998 2999
			struct ieee80211_hdr *hdr =
				(struct ieee80211_hdr *) skb->data;
			/* more buffered multicast/broadcast frames ==> set
			 * MoreData flag in IEEE 802.11 header to inform PS
			 * STAs */
			hdr->frame_control |=
				cpu_to_le16(IEEE80211_FCTL_MOREDATA);
		}

3000
		if (sdata->vif.type == NL80211_IFTYPE_AP)
3001
			sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev);
J
Johannes Berg 已提交
3002
		if (!ieee80211_tx_prepare(sdata, &tx, skb))
3003 3004 3005
			break;
		dev_kfree_skb_any(skb);
	}
3006 3007 3008

	info = IEEE80211_SKB_CB(skb);

3009
	tx.flags |= IEEE80211_TX_PS_BUFFERED;
3010
	info->band = chanctx_conf->def.chan->band;
3011

3012
	if (invoke_tx_handlers(&tx))
3013
		skb = NULL;
3014
 out:
3015
	rcu_read_unlock();
3016 3017 3018 3019

	return skb;
}
EXPORT_SYMBOL(ieee80211_get_buffered_bc);
J
Johannes Berg 已提交
3020

J
Johannes Berg 已提交
3021 3022 3023
void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata,
				 struct sk_buff *skb, int tid,
				 enum ieee80211_band band)
J
Johannes Berg 已提交
3024
{
3025
	int ac = ieee802_1d_to_ac[tid & 7];
3026

J
Johannes Berg 已提交
3027 3028 3029 3030
	skb_set_mac_header(skb, 0);
	skb_set_network_header(skb, 0);
	skb_set_transport_header(skb, 0);

3031
	skb_set_queue_mapping(skb, ac);
3032
	skb->priority = tid;
3033

3034 3035
	skb->dev = sdata->dev;

3036 3037 3038 3039 3040 3041
	/*
	 * The other path calling ieee80211_xmit is from the tasklet,
	 * and while we can handle concurrent transmissions locking
	 * requirements are that we do not come into tx with bhs on.
	 */
	local_bh_disable();
J
Johannes Berg 已提交
3042
	ieee80211_xmit(sdata, skb, band);
3043
	local_bh_enable();
J
Johannes Berg 已提交
3044
}