tx.c 83.7 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_OCB)
		return TX_CONTINUE;

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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)
550
{
551
	if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED))
552
		return TX_CONTINUE;
553

554
	if (tx->flags & IEEE80211_TX_UNICAST)
555 556 557 558 559
		return ieee80211_tx_h_unicast_ps_buf(tx);
	else
		return ieee80211_tx_h_multicast_ps_buf(tx);
}

560 561 562 563 564
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);

565 566 567 568 569
	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;
	}
570 571 572 573

	return TX_CONTINUE;
}

574
static ieee80211_tx_result debug_noinline
575
ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
576
{
577
	struct ieee80211_key *key;
578
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
579
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
580

J
Johannes Berg 已提交
581
	if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT))
582
		tx->key = NULL;
583 584
	else if (tx->sta &&
		 (key = rcu_dereference(tx->sta->ptk[tx->sta->ptk_idx])))
585
		tx->key = key;
586
	else if (ieee80211_is_mgmt(hdr->frame_control) &&
587
		 is_multicast_ether_addr(hdr->addr1) &&
588
		 ieee80211_is_robust_mgmt_frame(tx->skb) &&
589 590
		 (key = rcu_dereference(tx->sdata->default_mgmt_key)))
		tx->key = key;
591 592 593 594 595
	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)))
596
		tx->key = key;
597 598 599 600 601 602
	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;
603
	else if (ieee80211_is_robust_mgmt_frame(tx->skb) &&
604 605 606
		 !(ieee80211_is_action(hdr->frame_control) &&
		   tx->sta && test_sta_flag(tx->sta, WLAN_STA_MFP)))
		tx->key = NULL;
607
	else if (ieee80211_is_mgmt(hdr->frame_control) &&
608
		 !ieee80211_is_robust_mgmt_frame(tx->skb))
609
		tx->key = NULL;
610
	else {
611
		I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted);
612
		return TX_DROP;
613
	}
614 615

	if (tx->key) {
616 617
		bool skip_hw = false;

618
		tx->key->tx_rx_count++;
619
		/* TODO: add threshold stuff again */
620

621 622 623 624
		switch (tx->key->conf.cipher) {
		case WLAN_CIPHER_SUITE_WEP40:
		case WLAN_CIPHER_SUITE_WEP104:
		case WLAN_CIPHER_SUITE_TKIP:
625
			if (!ieee80211_is_data_present(hdr->frame_control))
626 627
				tx->key = NULL;
			break;
628
		case WLAN_CIPHER_SUITE_CCMP:
629 630 631 632
			if (!ieee80211_is_data_present(hdr->frame_control) &&
			    !ieee80211_use_mfp(hdr->frame_control, tx->sta,
					       tx->skb))
				tx->key = NULL;
633 634
			else
				skip_hw = (tx->key->conf.flags &
635
					   IEEE80211_KEY_FLAG_SW_MGMT_TX) &&
636
					ieee80211_is_mgmt(hdr->frame_control);
637
			break;
638
		case WLAN_CIPHER_SUITE_AES_CMAC:
639 640 641
			if (!ieee80211_is_mgmt(hdr->frame_control))
				tx->key = NULL;
			break;
642
		}
643

644 645
		if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED &&
			     !ieee80211_is_deauth(hdr->frame_control)))
646 647
			return TX_DROP;

J
Johannes Berg 已提交
648
		if (!skip_hw && tx->key &&
J
Johannes Berg 已提交
649
		    tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
650
			info->control.hw_key = &tx->key->conf;
651 652
	}

653
	return TX_CONTINUE;
654 655
}

656
static ieee80211_tx_result debug_noinline
657
ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
658
{
659
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
660 661
	struct ieee80211_hdr *hdr = (void *)tx->skb->data;
	struct ieee80211_supported_band *sband;
S
Shanyu Zhao 已提交
662
	u32 len;
663
	struct ieee80211_tx_rate_control txrc;
664
	struct ieee80211_sta_rates *ratetbl = NULL;
J
Johannes Berg 已提交
665
	bool assoc = false;
666

667
	memset(&txrc, 0, sizeof(txrc));
668

669
	sband = tx->local->hw.wiphy->bands[info->band];
670

S
Shanyu Zhao 已提交
671
	len = min_t(u32, tx->skb->len + FCS_LEN,
672
			 tx->local->hw.wiphy->frag_threshold);
673 674

	/* set up the tx rate control struct we give the RC algo */
J
Johannes Berg 已提交
675
	txrc.hw = &tx->local->hw;
676 677 678 679
	txrc.sband = sband;
	txrc.bss_conf = &tx->sdata->vif.bss_conf;
	txrc.skb = tx->skb;
	txrc.reported_rate.idx = -1;
680
	txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band];
681 682 683 684
	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;
685 686 687 688 689

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

690
	txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
691
		    tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT ||
692
		    tx->sdata->vif.type == NL80211_IFTYPE_ADHOC);
693 694

	/* set up RTS protection if desired */
695
	if (len > tx->local->hw.wiphy->rts_threshold) {
696
		txrc.rts = true;
697 698
	}

699
	info->control.use_rts = txrc.rts;
700 701
	info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot;

702 703 704 705 706 707 708 709
	/*
	 * 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
710
	     (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE))))
711 712 713
		txrc.short_preamble = true;

	info->control.short_preamble = txrc.short_preamble;
714

J
Johannes Berg 已提交
715 716
	if (tx->sta)
		assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
717 718 719 720 721

	/*
	 * 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
722
	if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc &&
723 724 725 726
		 !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",
727
		 tx->sdata->name, hdr->addr1,
728
		 info->band ? 5 : 2))
729
		return TX_DROP;
730

731 732 733 734
	/*
	 * If we're associated with the sta at this point we know we can at
	 * least send the frame at the lowest bit rate.
	 */
735 736
	rate_control_get_rate(tx->sdata, tx->sta, &txrc);

737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757
	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];
	}
758

759
	if (txrc.reported_rate.idx < 0) {
760
		txrc.reported_rate = tx->rate;
761 762 763
		if (tx->sta && ieee80211_is_data(hdr->frame_control))
			tx->sta->last_tx_rate = txrc.reported_rate;
	} else if (tx->sta)
764
		tx->sta->last_tx_rate = txrc.reported_rate;
765

766 767 768
	if (ratetbl)
		return TX_CONTINUE;

769 770
	if (unlikely(!info->control.rates[0].count))
		info->control.rates[0].count = 1;
771

772 773 774 775
	if (WARN_ON_ONCE((info->control.rates[0].count > 1) &&
			 (info->flags & IEEE80211_TX_CTL_NO_ACK)))
		info->control.rates[0].count = 1;

776 777 778
	return TX_CONTINUE;
}

779 780 781 782 783 784 785 786 787
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;

788 789 790 791 792
	/*
	 * 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.
	 */
793
	if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR))
794 795
		return TX_CONTINUE;

796 797 798 799 800 801
	if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
		return TX_CONTINUE;

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

802 803 804
	if (ieee80211_is_qos_nullfunc(hdr->frame_control))
		return TX_CONTINUE;

J
Johannes Berg 已提交
805 806 807
	/*
	 * Anything but QoS data that has a sequence number field
	 * (is long enough) gets a sequence number from the global
808 809
	 * 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
810
	 */
811 812
	if (!ieee80211_is_data_qos(hdr->frame_control) ||
	    is_multicast_ether_addr(hdr->addr1)) {
J
Johannes Berg 已提交
813
		/* driver should assign sequence number */
814
		info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
J
Johannes Berg 已提交
815 816 817
		/* 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;
818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842
		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;
}

843
static int ieee80211_fragment(struct ieee80211_tx_data *tx,
J
Johannes Berg 已提交
844 845 846
			      struct sk_buff *skb, int hdrlen,
			      int frag_threshold)
{
847
	struct ieee80211_local *local = tx->local;
848
	struct ieee80211_tx_info *info;
849
	struct sk_buff *tmp;
J
Johannes Berg 已提交
850 851 852 853 854 855 856
	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;

857 858
	/* first fragment was already added to queue by caller */

J
Johannes Berg 已提交
859 860 861 862 863 864 865 866
	while (rem) {
		int fraglen = per_fragm;

		if (fraglen > rem)
			fraglen = rem;
		rem -= fraglen;
		tmp = dev_alloc_skb(local->tx_headroom +
				    frag_threshold +
867
				    tx->sdata->encrypt_headroom +
J
Johannes Berg 已提交
868 869 870
				    IEEE80211_ENCRYPT_TAILROOM);
		if (!tmp)
			return -ENOMEM;
871 872 873

		__skb_queue_tail(&tx->skbs, tmp);

874 875 876
		skb_reserve(tmp,
			    local->tx_headroom + tx->sdata->encrypt_headroom);

J
Johannes Berg 已提交
877 878
		/* copy control information */
		memcpy(tmp->cb, skb->cb, sizeof(tmp->cb));
879 880 881 882 883 884 885 886

		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
887 888 889 890 891 892 893 894 895 896 897
		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;
	}

898
	/* adjust first fragment's length */
899
	skb_trim(skb, hdrlen + per_fragm);
J
Johannes Berg 已提交
900 901 902
	return 0;
}

903
static ieee80211_tx_result debug_noinline
904 905
ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
{
J
Johannes Berg 已提交
906 907 908
	struct sk_buff *skb = tx->skb;
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
	struct ieee80211_hdr *hdr = (void *)skb->data;
909
	int frag_threshold = tx->local->hw.wiphy->frag_threshold;
J
Johannes Berg 已提交
910 911
	int hdrlen;
	int fragnum;
912

913 914 915 916
	/* no matter what happens, tx->skb moves to tx->skbs */
	__skb_queue_tail(&tx->skbs, skb);
	tx->skb = NULL;

917 918 919 920
	if (info->flags & IEEE80211_TX_CTL_DONTFRAG)
		return TX_CONTINUE;

	if (tx->local->ops->set_frag_threshold)
921 922
		return TX_CONTINUE;

923 924
	/*
	 * Warn when submitting a fragmented A-MPDU frame and drop it.
J
Johannes Berg 已提交
925
	 * This scenario is handled in ieee80211_tx_prepare but extra
926
	 * caution taken here as fragmented ampdu may cause Tx stop.
927
	 */
S
Sujith 已提交
928
	if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
929 930
		return TX_DROP;

931
	hdrlen = ieee80211_hdrlen(hdr->frame_control);
932

933
	/* internal error, why isn't DONTFRAG set? */
934
	if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))
J
Johannes Berg 已提交
935
		return TX_DROP;
936

J
Johannes Berg 已提交
937 938 939 940 941 942 943 944
	/*
	 * 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.
	 */
945
	if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold))
J
Johannes Berg 已提交
946
		return TX_DROP;
947

J
Johannes Berg 已提交
948 949
	/* update duration/seq/flags of fragments */
	fragnum = 0;
950 951

	skb_queue_walk(&tx->skbs, skb) {
J
Johannes Berg 已提交
952
		const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
953

J
Johannes Berg 已提交
954 955
		hdr = (void *)skb->data;
		info = IEEE80211_SKB_CB(skb);
956

957
		if (!skb_queue_is_last(&tx->skbs, skb)) {
J
Johannes Berg 已提交
958
			hdr->frame_control |= morefrags;
959 960 961 962 963 964 965
			/*
			 * 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;
966
			BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4);
967
			info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
J
Johannes Berg 已提交
968 969
		} else {
			hdr->frame_control &= ~morefrags;
970
		}
J
Johannes Berg 已提交
971 972
		hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG);
		fragnum++;
973
	}
974

975
	return TX_CONTINUE;
976 977
}

978 979 980
static ieee80211_tx_result debug_noinline
ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
{
981
	struct sk_buff *skb;
982
	int ac = -1;
983 984 985 986

	if (!tx->sta)
		return TX_CONTINUE;

987
	skb_queue_walk(&tx->skbs, skb) {
988
		ac = skb_get_queue_mapping(skb);
989
		tx->sta->tx_fragments++;
990
		tx->sta->tx_bytes[ac] += skb->len;
991
	}
992 993
	if (ac >= 0)
		tx->sta->tx_packets[ac]++;
994 995 996 997

	return TX_CONTINUE;
}

998
static ieee80211_tx_result debug_noinline
999 1000 1001 1002 1003
ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
{
	if (!tx->key)
		return TX_CONTINUE;

1004 1005 1006
	switch (tx->key->conf.cipher) {
	case WLAN_CIPHER_SUITE_WEP40:
	case WLAN_CIPHER_SUITE_WEP104:
1007
		return ieee80211_crypto_wep_encrypt(tx);
1008
	case WLAN_CIPHER_SUITE_TKIP:
1009
		return ieee80211_crypto_tkip_encrypt(tx);
1010
	case WLAN_CIPHER_SUITE_CCMP:
1011
		return ieee80211_crypto_ccmp_encrypt(tx);
1012
	case WLAN_CIPHER_SUITE_AES_CMAC:
1013
		return ieee80211_crypto_aes_cmac_encrypt(tx);
1014
	default:
1015
		return ieee80211_crypto_hw_encrypt(tx);
1016 1017 1018 1019 1020
	}

	return TX_DROP;
}

1021
static ieee80211_tx_result debug_noinline
J
Johannes Berg 已提交
1022 1023
ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
{
1024
	struct sk_buff *skb;
J
Johannes Berg 已提交
1025 1026 1027
	struct ieee80211_hdr *hdr;
	int next_len;
	bool group_addr;
J
Johannes Berg 已提交
1028

1029
	skb_queue_walk(&tx->skbs, skb) {
J
Johannes Berg 已提交
1030
		hdr = (void *) skb->data;
1031 1032
		if (unlikely(ieee80211_is_pspoll(hdr->frame_control)))
			break; /* must not overwrite AID */
1033 1034 1035 1036 1037
		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
1038
		group_addr = is_multicast_ether_addr(hdr->addr1);
J
Johannes Berg 已提交
1039

J
Johannes Berg 已提交
1040
		hdr->duration_id =
1041 1042
			ieee80211_duration(tx, skb, group_addr, next_len);
	}
J
Johannes Berg 已提交
1043 1044 1045 1046

	return TX_CONTINUE;
}

1047 1048
/* actual transmit path */

1049 1050 1051 1052 1053 1054 1055
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;
1056
	bool reset_agg_timer = false;
1057
	struct sk_buff *purge_skb = NULL;
1058 1059 1060

	if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
		info->flags |= IEEE80211_TX_CTL_AMPDU;
1061
		reset_agg_timer = true;
1062 1063 1064 1065 1066
	} 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
		 */
1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086
	} 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
1087
		tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid);
1088 1089 1090 1091 1092

		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;
1093
			reset_agg_timer = true;
1094 1095 1096 1097
		} else {
			queued = true;
			info->control.vif = &tx->sdata->vif;
			info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1098
			info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
1099
			__skb_queue_tail(&tid_tx->pending, skb);
1100 1101
			if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER)
				purge_skb = __skb_dequeue(&tid_tx->pending);
1102 1103
		}
		spin_unlock(&tx->sta->lock);
1104 1105

		if (purge_skb)
1106
			ieee80211_free_txskb(&tx->local->hw, purge_skb);
1107 1108
	}

1109 1110
	/* reset session timer */
	if (reset_agg_timer && tid_tx->timeout)
1111
		tid_tx->last_tx = jiffies;
1112

1113 1114 1115
	return queued;
}

1116 1117 1118
/*
 * initialises @tx
 */
1119
static ieee80211_tx_result
J
Johannes Berg 已提交
1120 1121 1122
ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
		     struct ieee80211_tx_data *tx,
		     struct sk_buff *skb)
1123
{
J
Johannes Berg 已提交
1124
	struct ieee80211_local *local = sdata->local;
1125
	struct ieee80211_hdr *hdr;
1126
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
J
Johannes Berg 已提交
1127
	int tid;
1128
	u8 *qc;
1129 1130 1131 1132

	memset(tx, 0, sizeof(*tx));
	tx->skb = skb;
	tx->local = local;
J
Johannes Berg 已提交
1133
	tx->sdata = sdata;
1134
	__skb_queue_head_init(&tx->skbs);
1135

1136 1137 1138 1139 1140 1141 1142
	/*
	 * 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;

1143 1144
	hdr = (struct ieee80211_hdr *) skb->data;

1145
	if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1146
		tx->sta = rcu_dereference(sdata->u.vlan.sta);
1147 1148
		if (!tx->sta && sdata->dev->ieee80211_ptr->use_4addr)
			return TX_DROP;
1149 1150
	} else if (info->flags & (IEEE80211_TX_CTL_INJECTED |
				  IEEE80211_TX_INTFL_NL80211_FRAME_TX) ||
1151
		   tx->sdata->control_port_protocol == tx->skb->protocol) {
1152
		tx->sta = sta_info_get_bss(sdata, hdr->addr1);
1153
	}
1154
	if (!tx->sta)
1155
		tx->sta = sta_info_get(sdata, hdr->addr1);
1156

1157
	if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) &&
1158
	    !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
1159 1160
	    (local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION) &&
	    !(local->hw.flags & IEEE80211_HW_TX_AMPDU_SETUP_IN_HW)) {
1161 1162
		struct tid_ampdu_tx *tid_tx;

S
Sujith 已提交
1163 1164 1165
		qc = ieee80211_get_qos_ctl(hdr);
		tid = *qc & IEEE80211_QOS_CTL_TID_MASK;

1166 1167 1168
		tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
		if (tid_tx) {
			bool queued;
1169

1170 1171 1172 1173 1174 1175
			queued = ieee80211_tx_prep_agg(tx, skb, info,
						       tid_tx, tid);

			if (unlikely(queued))
				return TX_QUEUED;
		}
S
Sujith 已提交
1176 1177
	}

1178
	if (is_multicast_ether_addr(hdr->addr1)) {
1179
		tx->flags &= ~IEEE80211_TX_UNICAST;
1180
		info->flags |= IEEE80211_TX_CTL_NO_ACK;
1181
	} else
1182
		tx->flags |= IEEE80211_TX_UNICAST;
1183

1184 1185 1186 1187 1188
	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;
1189 1190
	}

1191
	if (!tx->sta)
1192
		info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
J
Johannes Berg 已提交
1193
	else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT))
1194
		info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1195

1196
	info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
1197

1198
	return TX_CONTINUE;
1199 1200
}

1201 1202 1203 1204 1205
static bool ieee80211_tx_frags(struct ieee80211_local *local,
			       struct ieee80211_vif *vif,
			       struct ieee80211_sta *sta,
			       struct sk_buff_head *skbs,
			       bool txpending)
1206
{
1207
	struct ieee80211_tx_control control;
1208
	struct sk_buff *skb, *tmp;
J
Johannes Berg 已提交
1209
	unsigned long flags;
1210

1211
	skb_queue_walk_safe(skbs, skb, tmp) {
1212 1213 1214 1215 1216 1217
		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);
1218
			ieee80211_free_txskb(&local->hw, skb);
1219 1220 1221
			continue;
		}
#endif
J
Johannes Berg 已提交
1222 1223 1224

		spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
		if (local->queue_stop_reasons[q] ||
1225
		    (!txpending && !skb_queue_empty(&local->pending[q]))) {
1226
			if (unlikely(info->flags &
1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244
				     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 {

1245
				/*
1246 1247 1248
				 * Since queue is stopped, queue up frames for
				 * later transmission from the tx-pending
				 * tasklet when the queue is woken again.
1249
				 */
1250 1251 1252 1253 1254 1255 1256 1257 1258 1259
				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;
1260
			}
1261
		}
J
Johannes Berg 已提交
1262
		spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1263

1264
		info->control.vif = vif;
1265
		control.sta = sta;
1266

1267
		__skb_unlink(skb, skbs);
1268
		drv_tx(local, &control, skb);
1269
	}
1270

1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287
	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;
1288

1289 1290
	if (WARN_ON(skb_queue_empty(skbs)))
		return true;
J
Johannes Berg 已提交
1291

1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305
	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:
1306 1307 1308 1309
		if (sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE) {
			vif = &sdata->vif;
			break;
		}
1310
		sdata = rcu_dereference(local->monitor_sdata);
1311
		if (sdata) {
1312
			vif = &sdata->vif;
1313 1314 1315 1316 1317 1318
			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
1319
			vif = NULL;
1320 1321 1322 1323 1324 1325 1326 1327
		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;
1328
	}
J
Johannes Berg 已提交
1329

1330 1331
	result = ieee80211_tx_frags(local, vif, pubsta, skbs,
				    txpending);
1332

1333 1334
	ieee80211_tpt_led_trig_tx(local, fc, led_len);

J
Johannes Berg 已提交
1335
	WARN_ON_ONCE(!skb_queue_empty(skbs));
1336

1337
	return result;
1338 1339
}

1340 1341 1342 1343 1344 1345
/*
 * 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)
{
1346
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
1347 1348
	ieee80211_tx_result res = TX_DROP;

1349 1350 1351 1352 1353 1354 1355
#define CALL_TXH(txh) \
	do {				\
		res = txh(tx);		\
		if (res != TX_CONTINUE)	\
			goto txh_done;	\
	} while (0)

1356
	CALL_TXH(ieee80211_tx_h_dynamic_ps);
1357 1358
	CALL_TXH(ieee80211_tx_h_check_assoc);
	CALL_TXH(ieee80211_tx_h_ps_buf);
1359
	CALL_TXH(ieee80211_tx_h_check_control_port_protocol);
1360
	CALL_TXH(ieee80211_tx_h_select_key);
1361 1362
	if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
		CALL_TXH(ieee80211_tx_h_rate_ctrl);
1363

J
Johannes Berg 已提交
1364 1365 1366
	if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) {
		__skb_queue_tail(&tx->skbs, tx->skb);
		tx->skb = NULL;
1367
		goto txh_done;
J
Johannes Berg 已提交
1368
	}
1369 1370

	CALL_TXH(ieee80211_tx_h_michael_mic_add);
1371 1372
	CALL_TXH(ieee80211_tx_h_sequence);
	CALL_TXH(ieee80211_tx_h_fragment);
1373
	/* handlers after fragment must be aware of tx info fragmentation! */
1374 1375
	CALL_TXH(ieee80211_tx_h_stats);
	CALL_TXH(ieee80211_tx_h_encrypt);
1376 1377
	if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
		CALL_TXH(ieee80211_tx_h_calculate_duration);
1378
#undef CALL_TXH
1379

1380
 txh_done:
1381
	if (unlikely(res == TX_DROP)) {
1382
		I802_DEBUG_INC(tx->local->tx_handlers_drop);
1383
		if (tx->skb)
1384
			ieee80211_free_txskb(&tx->local->hw, tx->skb);
1385
		else
1386
			ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs);
1387 1388
		return -1;
	} else if (unlikely(res == TX_QUEUED)) {
1389
		I802_DEBUG_INC(tx->local->tx_handlers_queued);
1390 1391 1392 1393 1394 1395
		return -1;
	}

	return 0;
}

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 1422 1423 1424
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);

1425 1426 1427 1428
/*
 * 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
1429 1430
			 struct sk_buff *skb, bool txpending,
			 enum ieee80211_band band)
1431
{
J
Johannes Berg 已提交
1432
	struct ieee80211_local *local = sdata->local;
1433
	struct ieee80211_tx_data tx;
1434
	ieee80211_tx_result res_prepare;
1435
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1436
	bool result = true;
1437
	int led_len;
1438 1439 1440

	if (unlikely(skb->len < 10)) {
		dev_kfree_skb(skb);
1441
		return true;
1442 1443
	}

1444
	/* initialises tx */
1445
	led_len = skb->len;
J
Johannes Berg 已提交
1446
	res_prepare = ieee80211_tx_prepare(sdata, &tx, skb);
1447

1448
	if (unlikely(res_prepare == TX_DROP)) {
1449
		ieee80211_free_txskb(&local->hw, skb);
J
Johannes Berg 已提交
1450
		return true;
1451
	} else if (unlikely(res_prepare == TX_QUEUED)) {
J
Johannes Berg 已提交
1452
		return true;
1453 1454
	}

J
Johannes Berg 已提交
1455
	info->band = band;
1456

1457 1458 1459 1460 1461 1462
	/* 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)];

1463
	if (!invoke_tx_handlers(&tx))
1464 1465
		result = __ieee80211_tx(local, &tx.skbs, led_len,
					tx.sta, txpending);
J
Johannes Berg 已提交
1466

1467
	return result;
1468 1469 1470 1471
}

/* device xmit handlers */

1472
static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata,
1473 1474 1475
				struct sk_buff *skb,
				int head_need, bool may_encrypt)
{
1476
	struct ieee80211_local *local = sdata->local;
1477 1478
	int tail_need = 0;

1479
	if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) {
1480 1481 1482 1483 1484
		tail_need = IEEE80211_ENCRYPT_TAILROOM;
		tail_need -= skb_tailroom(skb);
		tail_need = max_t(int, tail_need, 0);
	}

1485 1486 1487 1488
	if (skb_cloned(skb) &&
	    (!(local->hw.flags & IEEE80211_HW_SUPPORTS_CLONED_SKBS) ||
	     !skb_clone_writable(skb, ETH_HLEN) ||
	     sdata->crypto_tx_tailroom_needed_cnt))
1489
		I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1490
	else if (head_need || tail_need)
1491
		I802_DEBUG_INC(local->tx_expand_skb_head);
1492 1493
	else
		return 0;
1494 1495

	if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
J
Joe Perches 已提交
1496 1497
		wiphy_debug(local->hw.wiphy,
			    "failed to reallocate TX buffer\n");
1498 1499 1500 1501 1502 1503
		return -ENOMEM;
	}

	return 0;
}

J
Johannes Berg 已提交
1504 1505
void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
		    enum ieee80211_band band)
1506
{
J
Johannes Berg 已提交
1507
	struct ieee80211_local *local = sdata->local;
1508
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1509
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1510
	int headroom;
1511
	bool may_encrypt;
1512

J
Johannes Berg 已提交
1513
	may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT);
1514

J
Johannes Berg 已提交
1515
	headroom = local->tx_headroom;
1516
	if (may_encrypt)
1517
		headroom += sdata->encrypt_headroom;
1518 1519 1520
	headroom -= skb_headroom(skb);
	headroom = max_t(int, 0, headroom);

1521
	if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) {
1522
		ieee80211_free_txskb(&local->hw, skb);
J
Johannes Berg 已提交
1523
		return;
1524 1525
	}

1526
	hdr = (struct ieee80211_hdr *) skb->data;
1527
	info->control.vif = &sdata->vif;
1528

M
Marco Porsch 已提交
1529 1530 1531
	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
1532
			if (mesh_nexthop_resolve(sdata, skb))
M
Marco Porsch 已提交
1533 1534 1535 1536
				return; /* skb queued: don't free */
		} else {
			ieee80211_mps_set_frame_flags(sdata, NULL, hdr);
		}
1537
	}
1538

1539
	ieee80211_set_qos_hdr(sdata, skb);
J
Johannes Berg 已提交
1540
	ieee80211_tx(sdata, skb, false, band);
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 1623 1624 1625
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;
}

1626 1627
netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
					 struct net_device *dev)
1628 1629
{
	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
J
Johannes Berg 已提交
1630
	struct ieee80211_chanctx_conf *chanctx_conf;
1631 1632
	struct ieee80211_radiotap_header *prthdr =
		(struct ieee80211_radiotap_header *)skb->data;
J
Johannes Berg 已提交
1633
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1634
	struct ieee80211_hdr *hdr;
J
Johannes Berg 已提交
1635
	struct ieee80211_sub_if_data *tmp_sdata, *sdata;
1636
	struct cfg80211_chan_def *chandef;
1637
	u16 len_rthdr;
J
Johannes Berg 已提交
1638
	int hdrlen;
1639

1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653
	/* 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 */
1654 1655 1656 1657 1658 1659 1660

	/*
	 * 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
	 */
1661
	skb_set_mac_header(skb, len_rthdr);
1662
	/*
1663 1664
	 * 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
1665
	 */
1666 1667
	skb_set_network_header(skb, len_rthdr);
	skb_set_transport_header(skb, len_rthdr);
1668

J
Johannes Berg 已提交
1669 1670 1671 1672 1673 1674 1675 1676 1677
	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;

1678 1679 1680 1681
	/*
	 * Initialize skb->protocol if the injected frame is a data frame
	 * carrying a rfc1042 header
	 */
J
Johannes Berg 已提交
1682 1683 1684 1685
	if (ieee80211_is_data(hdr->frame_control) &&
	    skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) {
		u8 *payload = (u8 *)hdr + hdrlen;

1686
		if (ether_addr_equal(payload, rfc1042_header))
J
Johannes Berg 已提交
1687 1688
			skb->protocol = cpu_to_be16((payload[6] << 8) |
						    payload[7]);
1689 1690
	}

J
Johannes Berg 已提交
1691 1692
	memset(info, 0, sizeof(*info));

J
Johannes Berg 已提交
1693
	info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
1694 1695 1696 1697 1698
		      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
1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718

	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;
1719
		if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) {
J
Johannes Berg 已提交
1720 1721 1722 1723
			sdata = tmp_sdata;
			break;
		}
	}
1724

J
Johannes Berg 已提交
1725 1726 1727 1728 1729 1730 1731 1732
	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);
	}

1733
	if (chanctx_conf)
1734
		chandef = &chanctx_conf->def;
1735
	else if (!local->use_chanctx)
1736
		chandef = &local->_oper_chandef;
1737 1738
	else
		goto fail_rcu;
J
Johannes Berg 已提交
1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755

	/*
	 * 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.
	 */
1756 1757
	if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef,
				     sdata->vif.type))
J
Johannes Berg 已提交
1758 1759
		goto fail_rcu;

1760
	ieee80211_xmit(sdata, skb, chandef->chan->band);
J
Johannes Berg 已提交
1761 1762
	rcu_read_unlock();

1763
	return NETDEV_TX_OK;
1764

J
Johannes Berg 已提交
1765 1766
fail_rcu:
	rcu_read_unlock();
1767 1768 1769
fail:
	dev_kfree_skb(skb);
	return NETDEV_TX_OK; /* meaning, we dealt with the skb */
1770 1771
}

1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785
/*
 * 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;
1786
	skb->tstamp = ktime_get();
1787 1788
}

1789
/**
1790
 * __ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1791 1792 1793
 * subinterfaces (wlan#, WDS, and VLAN interfaces)
 * @skb: packet to be sent
 * @dev: incoming interface
1794
 * @info_flags: skb flags to set
1795
 *
1796
 * On failure skb will be freed.
1797 1798 1799 1800 1801 1802
 *
 * 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).
 */
1803 1804 1805
void __ieee80211_subif_start_xmit(struct sk_buff *skb,
				  struct net_device *dev,
				  u32 info_flags)
1806
{
1807 1808
	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
	struct ieee80211_local *local = sdata->local;
1809
	struct ieee80211_tx_info *info;
1810
	int head_need;
1811 1812
	u16 ethertype, hdrlen,  meshhdrlen = 0;
	__le16 fc;
1813
	struct ieee80211_hdr hdr;
1814
	struct ieee80211s_hdr mesh_hdr __maybe_unused;
1815
	struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL;
1816 1817
	const u8 *encaps_data;
	int encaps_len, skip_header_bytes;
1818
	int nh_pos, h_pos;
1819
	struct sta_info *sta = NULL;
J
Johannes Berg 已提交
1820
	bool wme_sta = false, authorized = false, tdls_auth = false;
1821
	bool tdls_peer = false, tdls_setup_frame = false;
J
Johannes Berg 已提交
1822 1823
	bool multicast;
	u16 info_id = 0;
J
Johannes Berg 已提交
1824 1825 1826
	struct ieee80211_chanctx_conf *chanctx_conf;
	struct ieee80211_sub_if_data *ap_sdata;
	enum ieee80211_band band;
1827

1828
	if (unlikely(skb->len < ETH_HLEN))
1829 1830 1831 1832 1833
		goto fail;

	/* convert Ethernet header to proper 802.11 header (based on
	 * operation mode) */
	ethertype = (skb->data[12] << 8) | skb->data[13];
1834
	fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
1835

J
Johannes Berg 已提交
1836 1837
	rcu_read_lock();

1838 1839 1840
	/* Measure frame arrival for Tx latency statistics calculation */
	ieee80211_tx_latency_start_msrmnt(local, skb);

1841
	switch (sdata->vif.type) {
1842
	case NL80211_IFTYPE_AP_VLAN:
1843
		sta = rcu_dereference(sdata->u.vlan.sta);
1844 1845 1846 1847
		if (sta) {
			fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
			/* RA TA DA SA */
			memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN);
1848
			memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1849 1850 1851
			memcpy(hdr.addr3, skb->data, ETH_ALEN);
			memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
			hdrlen = 30;
J
Johannes Berg 已提交
1852
			authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1853
			wme_sta = sta->sta.wme;
1854
		}
J
Johannes Berg 已提交
1855 1856 1857 1858 1859
		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;
1860
		band = chanctx_conf->def.chan->band;
1861 1862 1863 1864
		if (sta)
			break;
		/* fall through */
	case NL80211_IFTYPE_AP:
A
Arnd Bergmann 已提交
1865 1866 1867 1868
		if (sdata->vif.type == NL80211_IFTYPE_AP)
			chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
		if (!chanctx_conf)
			goto fail_rcu;
1869
		fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
1870 1871
		/* DA BSSID SA */
		memcpy(hdr.addr1, skb->data, ETH_ALEN);
1872
		memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1873 1874
		memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
		hdrlen = 24;
1875
		band = chanctx_conf->def.chan->band;
1876
		break;
1877
	case NL80211_IFTYPE_WDS:
1878
		fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1879 1880
		/* RA TA DA SA */
		memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
1881
		memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1882 1883 1884
		memcpy(hdr.addr3, skb->data, ETH_ALEN);
		memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
		hdrlen = 30;
J
Johannes Berg 已提交
1885 1886 1887 1888
		/*
		 * This is the exception! WDS style interfaces are prohibited
		 * when channel contexts are in used so this must be valid
		 */
1889
		band = local->hw.conf.chandef.chan->band;
1890
		break;
1891
#ifdef CONFIG_MAC80211_MESH
1892
	case NL80211_IFTYPE_MESH_POINT:
1893
		if (!is_multicast_ether_addr(skb->data)) {
1894 1895 1896
			struct sta_info *next_hop;
			bool mpp_lookup = true;

J
Johannes Berg 已提交
1897
			mpath = mesh_path_lookup(sdata, skb->data);
1898 1899 1900 1901 1902 1903 1904 1905 1906 1907
			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
1908
				mppath = mpp_path_lookup(sdata, skb->data);
1909 1910 1911

			if (mppath && mpath)
				mesh_path_del(mpath->sdata, mpath->dst);
1912
		}
1913

1914
		/*
1915 1916 1917 1918
		 * 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)
1919
		 */
1920 1921
		if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) &&
		    !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) {
1922 1923
			hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
					skb->data, skb->data + ETH_ALEN);
J
Johannes Berg 已提交
1924 1925
			meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr,
							       NULL, NULL);
1926
		} else {
1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938
			/* 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;
1939

1940
			hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
1941
					mesh_da, sdata->vif.addr);
1942 1943
			if (is_multicast_ether_addr(mesh_da))
				/* DA TA mSA AE:SA */
J
Johannes Berg 已提交
1944 1945 1946
				meshhdrlen = ieee80211_new_mesh_header(
						sdata, &mesh_hdr,
						skb->data + ETH_ALEN, NULL);
1947
			else
1948
				/* RA TA mDA mSA AE:DA SA */
J
Johannes Berg 已提交
1949 1950 1951
				meshhdrlen = ieee80211_new_mesh_header(
						sdata, &mesh_hdr, skb->data,
						skb->data + ETH_ALEN);
1952 1953

		}
J
Johannes Berg 已提交
1954 1955 1956
		chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
		if (!chanctx_conf)
			goto fail_rcu;
1957
		band = chanctx_conf->def.chan->band;
1958 1959
		break;
#endif
1960
	case NL80211_IFTYPE_STATION:
1961 1962
		if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
			sta = sta_info_get(sdata, skb->data);
J
Johannes Berg 已提交
1963 1964 1965
			if (sta) {
				authorized = test_sta_flag(sta,
							WLAN_STA_AUTHORIZED);
1966
				wme_sta = sta->sta.wme;
J
Johannes Berg 已提交
1967
				tdls_peer = test_sta_flag(sta,
1968
							  WLAN_STA_TDLS_PEER);
J
Johannes Berg 已提交
1969 1970 1971
				tdls_auth = test_sta_flag(sta,
						WLAN_STA_TDLS_PEER_AUTH);
			}
1972

1973 1974 1975 1976 1977
			if (tdls_peer)
				tdls_setup_frame =
					ethertype == ETH_P_TDLS &&
					skb->len > 14 &&
					skb->data[14] == WLAN_TDLS_SNAP_RFTYPE;
1978 1979
		}

1980 1981 1982 1983 1984 1985 1986 1987
		/*
		 * 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;
1988

1989 1990
		/* send direct packets to authorized TDLS peers */
		if (tdls_peer && tdls_auth) {
1991 1992 1993 1994 1995 1996 1997 1998 1999
			/* 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);
2000
			/* RA TA DA SA */
2001
			memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
2002
			memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2003 2004 2005 2006 2007 2008
			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 */
2009
			memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
2010 2011 2012 2013
			memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
			memcpy(hdr.addr3, skb->data, ETH_ALEN);
			hdrlen = 24;
		}
J
Johannes Berg 已提交
2014 2015 2016
		chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
		if (!chanctx_conf)
			goto fail_rcu;
2017
		band = chanctx_conf->def.chan->band;
2018
		break;
2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029
	case NL80211_IFTYPE_OCB:
		/* DA SA BSSID */
		memcpy(hdr.addr1, skb->data, ETH_ALEN);
		memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
		eth_broadcast_addr(hdr.addr3);
		hdrlen = 24;
		chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
		if (!chanctx_conf)
			goto fail_rcu;
		band = chanctx_conf->def.chan->band;
		break;
2030
	case NL80211_IFTYPE_ADHOC:
2031 2032 2033
		/* DA SA BSSID */
		memcpy(hdr.addr1, skb->data, ETH_ALEN);
		memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2034
		memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN);
2035
		hdrlen = 24;
J
Johannes Berg 已提交
2036 2037 2038
		chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
		if (!chanctx_conf)
			goto fail_rcu;
2039
		band = chanctx_conf->def.chan->band;
2040 2041
		break;
	default:
J
Johannes Berg 已提交
2042
		goto fail_rcu;
2043 2044
	}

2045 2046 2047 2048 2049
	/*
	 * 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
2050 2051
	multicast = is_multicast_ether_addr(hdr.addr1);
	if (!multicast) {
2052
		sta = sta_info_get(sdata, hdr.addr1);
J
Johannes Berg 已提交
2053 2054
		if (sta) {
			authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
2055
			wme_sta = sta->sta.wme;
J
Johannes Berg 已提交
2056
		}
2057 2058
	}

2059 2060
	/* For mesh, the use of the QoS header is mandatory */
	if (ieee80211_vif_is_mesh(&sdata->vif))
J
Johannes Berg 已提交
2061
		wme_sta = true;
2062

2063
	/* receiver and we are QoS enabled, use a QoS type frame */
J
Johannes Berg 已提交
2064
	if (wme_sta && local->hw.queues >= IEEE80211_NUM_ACS) {
2065
		fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
2066 2067 2068 2069
		hdrlen += 2;
	}

	/*
2070 2071
	 * Drop unicast frames to unauthorised stations unless they are
	 * EAPOL frames from the local station.
2072
	 */
2073
	if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) &&
2074
		     (sdata->vif.type != NL80211_IFTYPE_OCB) &&
2075
		     !multicast && !authorized &&
2076
		     (cpu_to_be16(ethertype) != sdata->control_port_protocol ||
2077
		      !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) {
2078
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
J
Johannes Berg 已提交
2079
		net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n",
2080
				    dev->name, hdr.addr1);
2081 2082 2083 2084
#endif

		I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);

J
Johannes Berg 已提交
2085
		goto fail_rcu;
2086 2087
	}

J
Johannes Berg 已提交
2088 2089
	if (unlikely(!multicast && skb->sk &&
		     skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) {
2090
		struct sk_buff *ack_skb = skb_clone_sk(skb);
J
Johannes Berg 已提交
2091

2092
		if (ack_skb) {
J
Johannes Berg 已提交
2093
			unsigned long flags;
T
Tejun Heo 已提交
2094
			int id;
J
Johannes Berg 已提交
2095 2096

			spin_lock_irqsave(&local->ack_status_lock, flags);
2097
			id = idr_alloc(&local->ack_status_frames, ack_skb,
T
Tejun Heo 已提交
2098
				       1, 0x10000, GFP_ATOMIC);
J
Johannes Berg 已提交
2099 2100
			spin_unlock_irqrestore(&local->ack_status_lock, flags);

T
Tejun Heo 已提交
2101
			if (id >= 0) {
J
Johannes Berg 已提交
2102 2103 2104
				info_id = id;
				info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
			} else {
2105
				kfree_skb(ack_skb);
J
Johannes Berg 已提交
2106 2107 2108 2109
			}
		}
	}

2110 2111 2112 2113
	/*
	 * If the skb is shared we need to obtain our own copy.
	 */
	if (skb_shared(skb)) {
J
Johannes Berg 已提交
2114 2115 2116 2117 2118
		struct sk_buff *tmp_skb = skb;

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

2119
		skb = skb_clone(skb, GFP_ATOMIC);
2120 2121
		kfree_skb(tmp_skb);

2122
		if (!skb)
J
Johannes Berg 已提交
2123
			goto fail_rcu;
2124 2125
	}

2126
	hdr.frame_control = fc;
2127 2128 2129 2130 2131 2132 2133 2134
	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
2135
	} else if (ethertype >= ETH_P_802_3_MIN) {
2136 2137 2138 2139 2140 2141 2142 2143
		encaps_data = rfc1042_header;
		encaps_len = sizeof(rfc1042_header);
		skip_header_bytes -= 2;
	} else {
		encaps_data = NULL;
		encaps_len = 0;
	}

2144 2145 2146
	nh_pos = skb_network_header(skb) - skb->data;
	h_pos = skb_transport_header(skb) - skb->data;

2147 2148 2149 2150
	skb_pull(skb, skip_header_bytes);
	nh_pos -= skip_header_bytes;
	h_pos -= skip_header_bytes;

2151
	head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
2152

2153 2154 2155 2156 2157 2158 2159 2160 2161 2162 2163
	/*
	 * 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.
	 */
2164

2165
	if (head_need > 0 || skb_cloned(skb)) {
2166
		head_need += sdata->encrypt_headroom;
2167 2168
		head_need += local->tx_headroom;
		head_need = max_t(int, 0, head_need);
2169 2170
		if (ieee80211_skb_resize(sdata, skb, head_need, true)) {
			ieee80211_free_txskb(&local->hw, skb);
J
Johannes Berg 已提交
2171
			skb = NULL;
J
Johannes Berg 已提交
2172
			goto fail_rcu;
2173
		}
2174 2175 2176 2177 2178 2179 2180
	}

	if (encaps_data) {
		memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
		nh_pos += encaps_len;
		h_pos += encaps_len;
	}
2181

2182
#ifdef CONFIG_MAC80211_MESH
2183 2184 2185 2186 2187
	if (meshhdrlen > 0) {
		memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
		nh_pos += meshhdrlen;
		h_pos += meshhdrlen;
	}
2188
#endif
2189

2190
	if (ieee80211_is_data_qos(fc)) {
2191 2192
		__le16 *qos_control;

W
Weilong Chen 已提交
2193
		qos_control = (__le16 *) skb_push(skb, 2);
2194 2195 2196 2197 2198 2199 2200 2201 2202
		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);

2203 2204 2205
	nh_pos += hdrlen;
	h_pos += hdrlen;

2206 2207
	dev->stats.tx_packets++;
	dev->stats.tx_bytes += skb->len;
2208 2209 2210 2211 2212 2213 2214 2215

	/* 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);

2216
	info = IEEE80211_SKB_CB(skb);
J
Johannes Berg 已提交
2217 2218
	memset(info, 0, sizeof(*info));

2219
	dev->trans_start = jiffies;
J
Johannes Berg 已提交
2220 2221 2222 2223

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

J
Johannes Berg 已提交
2224 2225
	ieee80211_xmit(sdata, skb, band);
	rcu_read_unlock();
2226

2227
	return;
2228

J
Johannes Berg 已提交
2229 2230
 fail_rcu:
	rcu_read_unlock();
2231
 fail:
2232
	dev_kfree_skb(skb);
2233 2234
}

2235 2236 2237 2238 2239 2240
netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
				       struct net_device *dev)
{
	__ieee80211_subif_start_xmit(skb, dev, 0);
	return NETDEV_TX_OK;
}
2241

2242 2243 2244 2245
/*
 * ieee80211_clear_tx_pending may not be called in a context where
 * it is possible that it packets could come in again.
 */
2246 2247
void ieee80211_clear_tx_pending(struct ieee80211_local *local)
{
2248
	struct sk_buff *skb;
J
Johannes Berg 已提交
2249
	int i;
2250

2251 2252 2253 2254
	for (i = 0; i < local->hw.queues; i++) {
		while ((skb = skb_dequeue(&local->pending[i])) != NULL)
			ieee80211_free_txskb(&local->hw, skb);
	}
2255 2256
}

2257 2258 2259 2260 2261
/*
 * 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.
 */
2262 2263 2264 2265 2266 2267 2268
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;
2269
	bool result;
J
Johannes Berg 已提交
2270
	struct ieee80211_chanctx_conf *chanctx_conf;
2271

2272
	sdata = vif_to_sdata(info->control.vif);
2273 2274

	if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) {
J
Johannes Berg 已提交
2275 2276 2277 2278 2279 2280
		chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
		if (unlikely(!chanctx_conf)) {
			dev_kfree_skb(skb);
			return true;
		}
		result = ieee80211_tx(sdata, skb, true,
2281
				      chanctx_conf->def.chan->band);
2282
	} else {
2283 2284 2285 2286 2287
		struct sk_buff_head skbs;

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

2288
		hdr = (struct ieee80211_hdr *)skb->data;
2289
		sta = sta_info_get(sdata, hdr->addr1);
2290

2291
		result = __ieee80211_tx(local, &skbs, skb->len, sta, true);
2292 2293 2294 2295 2296
	}

	return result;
}

2297
/*
J
Johannes Berg 已提交
2298
 * Transmit all pending packets. Called from tasklet.
2299
 */
2300 2301 2302
void ieee80211_tx_pending(unsigned long data)
{
	struct ieee80211_local *local = (struct ieee80211_local *)data;
2303
	unsigned long flags;
2304
	int i;
J
Johannes Berg 已提交
2305
	bool txok;
2306

2307
	rcu_read_lock();
2308

J
Johannes Berg 已提交
2309
	spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
2310 2311 2312 2313 2314
	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
2315
		if (local->queue_stop_reasons[i] ||
2316
		    skb_queue_empty(&local->pending[i]))
2317
			continue;
2318

2319
		while (!skb_queue_empty(&local->pending[i])) {
J
Johannes Berg 已提交
2320
			struct sk_buff *skb = __skb_dequeue(&local->pending[i]);
2321 2322
			struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);

2323
			if (WARN_ON(!info->control.vif)) {
2324
				ieee80211_free_txskb(&local->hw, skb);
2325 2326 2327
				continue;
			}

J
Johannes Berg 已提交
2328 2329 2330 2331 2332 2333 2334
			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)
2335
				break;
2336
		}
2337 2338

		if (skb_queue_empty(&local->pending[i]))
2339
			ieee80211_propagate_queue_wake(local, i);
2340
	}
J
Johannes Berg 已提交
2341
	spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
2342

2343
	rcu_read_unlock();
2344 2345 2346 2347
}

/* functions for drivers to get certain frames */

2348
static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
2349 2350
				       struct ps_data *ps, struct sk_buff *skb,
				       bool is_template)
2351 2352 2353 2354 2355 2356 2357
{
	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. */
2358
	if (atomic_read(&ps->num_sta_ps) > 0)
2359 2360
		/* in the hope that this is faster than
		 * checking byte-for-byte */
W
Weilong Chen 已提交
2361
		have_bits = !bitmap_empty((unsigned long *)ps->tim,
2362
					  IEEE80211_MAX_AID+1);
2363 2364 2365 2366 2367 2368
	if (!is_template) {
		if (ps->dtim_count == 0)
			ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1;
		else
			ps->dtim_count--;
	}
2369 2370 2371 2372

	tim = pos = (u8 *) skb_put(skb, 6);
	*pos++ = WLAN_EID_TIM;
	*pos++ = 4;
2373
	*pos++ = ps->dtim_count;
2374
	*pos++ = sdata->vif.bss_conf.dtim_period;
2375

2376
	if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf))
2377 2378
		aid0 = 1;

2379
	ps->dtim_bc_mc = aid0 == 1;
2380

2381 2382 2383 2384 2385 2386
	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++) {
2387
			if (ps->tim[i]) {
2388 2389 2390 2391 2392 2393
				n1 = i & 0xfe;
				break;
			}
		}
		n2 = n1;
		for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
2394
			if (ps->tim[i]) {
2395 2396 2397 2398 2399 2400 2401 2402
				n2 = i;
				break;
			}
		}

		/* Bitmap control */
		*pos++ = n1 | aid0;
		/* Part Virt Bitmap */
2403
		skb_put(skb, n2 - n1);
2404
		memcpy(pos, ps->tim + n1, n2 - n1 + 1);
2405 2406 2407 2408 2409 2410 2411 2412

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

2413
static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
2414 2415
				    struct ps_data *ps, struct sk_buff *skb,
				    bool is_template)
2416 2417 2418 2419 2420 2421 2422 2423 2424 2425 2426
{
	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) {
2427
		__ieee80211_beacon_add_tim(sdata, ps, skb, is_template);
2428
	} else {
J
Johannes Berg 已提交
2429
		spin_lock_bh(&local->tim_lock);
2430
		__ieee80211_beacon_add_tim(sdata, ps, skb, is_template);
J
Johannes Berg 已提交
2431
		spin_unlock_bh(&local->tim_lock);
2432 2433 2434 2435 2436
	}

	return 0;
}

2437 2438
static void ieee80211_set_csa(struct ieee80211_sub_if_data *sdata,
			      struct beacon_data *beacon)
2439 2440
{
	struct probe_resp *resp;
2441 2442
	u8 *beacon_data;
	size_t beacon_data_len;
2443
	int i;
2444
	u8 count = beacon->csa_current_counter;
2445 2446 2447 2448 2449 2450 2451 2452 2453 2454

	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;
2455 2456 2457 2458
	case NL80211_IFTYPE_MESH_POINT:
		beacon_data = beacon->head;
		beacon_data_len = beacon->head_len;
		break;
2459 2460 2461
	default:
		return;
	}
2462

2463
	rcu_read_lock();
2464
	for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; ++i) {
2465
		resp = rcu_dereference(sdata->u.ap.probe_resp);
2466

2467 2468 2469
		if (beacon->csa_counter_offsets[i]) {
			if (WARN_ON_ONCE(beacon->csa_counter_offsets[i] >=
					 beacon_data_len)) {
2470 2471 2472
				rcu_read_unlock();
				return;
			}
2473 2474

			beacon_data[beacon->csa_counter_offsets[i]] = count;
2475
		}
2476 2477 2478

		if (sdata->vif.type == NL80211_IFTYPE_AP && resp)
			resp->data[resp->csa_counter_offsets[i]] = count;
2479
	}
2480
	rcu_read_unlock();
2481 2482 2483 2484 2485
}

u8 ieee80211_csa_update_counter(struct ieee80211_vif *vif)
{
	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2486 2487
	struct beacon_data *beacon = NULL;
	u8 count = 0;
2488

2489 2490 2491 2492 2493 2494 2495 2496 2497 2498 2499 2500 2501
	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--;
2502 2503

	/* the counter should never reach 0 */
2504 2505
	WARN_ON_ONCE(!beacon->csa_current_counter);
	count = beacon->csa_current_counter;
2506

2507 2508 2509
unlock:
	rcu_read_unlock();
	return count;
2510
}
2511
EXPORT_SYMBOL(ieee80211_csa_update_counter);
2512 2513 2514 2515 2516 2517 2518 2519 2520 2521 2522 2523 2524 2525 2526 2527 2528 2529 2530 2531 2532

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;
2533 2534 2535 2536 2537 2538 2539
	} else if (vif->type == NL80211_IFTYPE_ADHOC) {
		struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;

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

2540 2541 2542 2543 2544 2545 2546 2547 2548
		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;

2549 2550
		beacon_data = beacon->head;
		beacon_data_len = beacon->head_len;
2551 2552 2553 2554 2555
	} else {
		WARN_ON(1);
		goto out;
	}

2556 2557 2558
	if (!beacon->csa_counter_offsets[0])
		goto out;

2559
	if (WARN_ON_ONCE(beacon->csa_counter_offsets[0] > beacon_data_len))
2560 2561
		goto out;

2562
	if (beacon_data[beacon->csa_counter_offsets[0]] == 1)
2563 2564 2565 2566 2567 2568 2569 2570
		ret = true;
 out:
	rcu_read_unlock();

	return ret;
}
EXPORT_SYMBOL(ieee80211_csa_is_complete);

2571 2572 2573 2574 2575
static struct sk_buff *
__ieee80211_beacon_get(struct ieee80211_hw *hw,
		       struct ieee80211_vif *vif,
		       struct ieee80211_mutable_offsets *offs,
		       bool is_template)
2576 2577
{
	struct ieee80211_local *local = hw_to_local(hw);
2578
	struct beacon_data *beacon = NULL;
2579
	struct sk_buff *skb = NULL;
2580
	struct ieee80211_tx_info *info;
2581
	struct ieee80211_sub_if_data *sdata = NULL;
J
Johannes Berg 已提交
2582
	enum ieee80211_band band;
2583
	struct ieee80211_tx_rate_control txrc;
J
Johannes Berg 已提交
2584
	struct ieee80211_chanctx_conf *chanctx_conf;
2585
	int csa_off_base = 0;
2586

2587
	rcu_read_lock();
2588

2589
	sdata = vif_to_sdata(vif);
J
Johannes Berg 已提交
2590
	chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2591

J
Johannes Berg 已提交
2592
	if (!ieee80211_sdata_running(sdata) || !chanctx_conf)
2593 2594
		goto out;

2595 2596
	if (offs)
		memset(offs, 0, sizeof(*offs));
2597

2598
	if (sdata->vif.type == NL80211_IFTYPE_AP) {
2599 2600
		struct ieee80211_if_ap *ap = &sdata->u.ap;

2601
		beacon = rcu_dereference(ap->beacon);
D
Dan Carpenter 已提交
2602
		if (beacon) {
2603
			if (beacon->csa_counter_offsets[0]) {
2604 2605 2606 2607 2608
				if (!is_template)
					ieee80211_csa_update_counter(vif);

				ieee80211_set_csa(sdata, beacon);
			}
2609

J
Johannes Berg 已提交
2610 2611 2612 2613 2614 2615
			/*
			 * headroom, head length,
			 * tail length and maximum TIM length
			 */
			skb = dev_alloc_skb(local->tx_headroom +
					    beacon->head_len +
2616 2617
					    beacon->tail_len + 256 +
					    local->hw.extra_beacon_tailroom);
J
Johannes Berg 已提交
2618 2619
			if (!skb)
				goto out;
2620

J
Johannes Berg 已提交
2621 2622 2623
			skb_reserve(skb, local->tx_headroom);
			memcpy(skb_put(skb, beacon->head_len), beacon->head,
			       beacon->head_len);
2624

2625 2626
			ieee80211_beacon_add_tim(sdata, &ap->ps, skb,
						 is_template);
2627

2628 2629 2630
			if (offs) {
				offs->tim_offset = beacon->head_len;
				offs->tim_length = skb->len - beacon->head_len;
2631 2632 2633

				/* for AP the csa offsets are from tail */
				csa_off_base = skb->len;
2634
			}
2635

J
Johannes Berg 已提交
2636 2637 2638
			if (beacon->tail)
				memcpy(skb_put(skb, beacon->tail_len),
				       beacon->tail, beacon->tail_len);
2639 2640
		} else
			goto out;
2641
	} else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
2642
		struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
2643
		struct ieee80211_hdr *hdr;
2644

2645 2646
		beacon = rcu_dereference(ifibss->presp);
		if (!beacon)
2647 2648
			goto out;

2649
		if (beacon->csa_counter_offsets[0]) {
2650 2651
			if (!is_template)
				ieee80211_csa_update_counter(vif);
2652

2653
			ieee80211_set_csa(sdata, beacon);
2654
		}
2655

2656
		skb = dev_alloc_skb(local->tx_headroom + beacon->head_len +
2657
				    local->hw.extra_beacon_tailroom);
2658 2659
		if (!skb)
			goto out;
2660
		skb_reserve(skb, local->tx_headroom);
2661 2662
		memcpy(skb_put(skb, beacon->head_len), beacon->head,
		       beacon->head_len);
2663 2664

		hdr = (struct ieee80211_hdr *) skb->data;
2665 2666
		hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
						 IEEE80211_STYPE_BEACON);
J
Johannes Berg 已提交
2667
	} else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2668
		struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2669

2670 2671
		beacon = rcu_dereference(ifmsh->beacon);
		if (!beacon)
2672 2673
			goto out;

2674
		if (beacon->csa_counter_offsets[0]) {
2675 2676 2677 2678 2679 2680 2681 2682
			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);

2683
			ieee80211_set_csa(sdata, beacon);
2684
		}
2685

2686
		if (ifmsh->sync_ops)
2687
			ifmsh->sync_ops->adjust_tbtt(sdata, beacon);
2688

2689
		skb = dev_alloc_skb(local->tx_headroom +
2690
				    beacon->head_len +
M
Marco Porsch 已提交
2691
				    256 + /* TIM IE */
2692
				    beacon->tail_len +
2693
				    local->hw.extra_beacon_tailroom);
J
Johannes Berg 已提交
2694 2695
		if (!skb)
			goto out;
T
Thomas Pedersen 已提交
2696
		skb_reserve(skb, local->tx_headroom);
2697 2698
		memcpy(skb_put(skb, beacon->head_len), beacon->head,
		       beacon->head_len);
2699 2700 2701
		ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb, is_template);

		if (offs) {
2702 2703
			offs->tim_offset = beacon->head_len;
			offs->tim_length = skb->len - beacon->head_len;
2704 2705
		}

2706 2707
		memcpy(skb_put(skb, beacon->tail_len), beacon->tail,
		       beacon->tail_len);
2708 2709
	} else {
		WARN_ON(1);
2710
		goto out;
2711 2712
	}

2713
	/* CSA offsets */
2714
	if (offs && beacon) {
2715 2716 2717
		int i;

		for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; i++) {
2718
			u16 csa_off = beacon->csa_counter_offsets[i];
2719 2720 2721 2722 2723 2724 2725 2726

			if (!csa_off)
				continue;

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

2727
	band = chanctx_conf->def.chan->band;
J
Johannes Berg 已提交
2728

2729 2730
	info = IEEE80211_SKB_CB(skb);

J
Johannes Berg 已提交
2731
	info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
2732
	info->flags |= IEEE80211_TX_CTL_NO_ACK;
2733
	info->band = band;
2734 2735 2736

	memset(&txrc, 0, sizeof(txrc));
	txrc.hw = hw;
2737
	txrc.sband = local->hw.wiphy->bands[band];
2738 2739 2740
	txrc.bss_conf = &sdata->vif.bss_conf;
	txrc.skb = skb;
	txrc.reported_rate.idx = -1;
2741
	txrc.rate_idx_mask = sdata->rc_rateidx_mask[band];
2742
	if (txrc.rate_idx_mask == (1 << txrc.sband->n_bitrates) - 1)
2743 2744 2745
		txrc.max_rate_idx = -1;
	else
		txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
2746
	txrc.bss = true;
2747
	rate_control_get_rate(sdata, NULL, &txrc);
2748 2749

	info->control.vif = vif;
2750

2751 2752 2753
	info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT |
			IEEE80211_TX_CTL_ASSIGN_SEQ |
			IEEE80211_TX_CTL_FIRST_FRAGMENT;
2754
 out:
2755
	rcu_read_unlock();
2756
	return skb;
2757 2758 2759 2760 2761 2762 2763 2764 2765 2766 2767 2768 2769 2770 2771 2772 2773 2774 2775 2776 2777 2778 2779 2780 2781 2782

}

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;
2783
}
2784
EXPORT_SYMBOL(ieee80211_beacon_get_tim);
2785

2786 2787 2788 2789
struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw,
					struct ieee80211_vif *vif)
{
	struct ieee80211_if_ap *ap = NULL;
2790 2791
	struct sk_buff *skb = NULL;
	struct probe_resp *presp = NULL;
2792 2793 2794 2795 2796 2797 2798 2799 2800 2801 2802 2803 2804
	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;

2805
	skb = dev_alloc_skb(presp->len);
2806 2807 2808
	if (!skb)
		goto out;

2809 2810
	memcpy(skb_put(skb, presp->len), presp->data, presp->len);

2811 2812 2813 2814 2815 2816 2817 2818 2819
	hdr = (struct ieee80211_hdr *) skb->data;
	memset(hdr->addr1, 0, sizeof(hdr->addr1));

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

2820 2821 2822 2823 2824 2825 2826 2827 2828 2829 2830 2831 2832 2833 2834 2835 2836
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));
2837
	if (!skb)
2838
		return NULL;
2839

2840 2841 2842 2843 2844 2845 2846 2847 2848 2849 2850 2851 2852 2853 2854 2855 2856 2857 2858 2859 2860 2861 2862 2863 2864 2865 2866 2867 2868 2869 2870 2871 2872 2873 2874
	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));
2875
	if (!skb)
2876
		return NULL;
2877

2878 2879 2880 2881 2882 2883 2884 2885 2886 2887 2888 2889 2890 2891 2892 2893
	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);

2894 2895 2896
struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw,
				       struct ieee80211_vif *vif,
				       const u8 *ssid, size_t ssid_len,
2897
				       size_t tailroom)
2898 2899 2900 2901 2902 2903 2904 2905 2906 2907 2908 2909 2910
{
	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) +
2911
			    ie_ssid_len + tailroom);
2912
	if (!skb)
2913 2914 2915 2916 2917 2918 2919 2920
		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
2921
	eth_broadcast_addr(hdr->addr1);
2922
	memcpy(hdr->addr2, vif->addr, ETH_ALEN);
J
Johannes Berg 已提交
2923
	eth_broadcast_addr(hdr->addr3);
2924 2925 2926 2927

	pos = skb_put(skb, ie_ssid_len);
	*pos++ = WLAN_EID_SSID;
	*pos++ = ssid_len;
2928
	if (ssid_len)
2929 2930 2931 2932 2933 2934 2935
		memcpy(pos, ssid, ssid_len);
	pos += ssid_len;

	return skb;
}
EXPORT_SYMBOL(ieee80211_probereq_get);

2936
void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
2937
		       const void *frame, size_t frame_len,
2938
		       const struct ieee80211_tx_info *frame_txctl,
2939 2940 2941 2942
		       struct ieee80211_rts *rts)
{
	const struct ieee80211_hdr *hdr = frame;

2943 2944
	rts->frame_control =
	    cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
2945 2946
	rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
					       frame_txctl);
2947 2948 2949 2950 2951
	memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
	memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
}
EXPORT_SYMBOL(ieee80211_rts_get);

2952
void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
2953
			     const void *frame, size_t frame_len,
2954
			     const struct ieee80211_tx_info *frame_txctl,
2955 2956 2957 2958
			     struct ieee80211_cts *cts)
{
	const struct ieee80211_hdr *hdr = frame;

2959 2960
	cts->frame_control =
	    cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
2961 2962
	cts->duration = ieee80211_ctstoself_duration(hw, vif,
						     frame_len, frame_txctl);
2963 2964 2965 2966 2967
	memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
}
EXPORT_SYMBOL(ieee80211_ctstoself_get);

struct sk_buff *
2968
ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
2969
			  struct ieee80211_vif *vif)
2970 2971
{
	struct ieee80211_local *local = hw_to_local(hw);
2972
	struct sk_buff *skb = NULL;
2973
	struct ieee80211_tx_data tx;
2974
	struct ieee80211_sub_if_data *sdata;
2975
	struct ps_data *ps;
2976
	struct ieee80211_tx_info *info;
J
Johannes Berg 已提交
2977
	struct ieee80211_chanctx_conf *chanctx_conf;
2978

2979
	sdata = vif_to_sdata(vif);
2980 2981

	rcu_read_lock();
J
Johannes Berg 已提交
2982
	chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2983

2984 2985 2986 2987 2988 2989 2990 2991 2992 2993 2994
	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
2995 2996
	} else if (ieee80211_vif_is_mesh(&sdata->vif)) {
		ps = &sdata->u.mesh.ps;
2997
	} else {
2998
		goto out;
2999
	}
3000

3001
	if (ps->dtim_count != 0 || !ps->dtim_bc_mc)
3002
		goto out; /* send buffered bc/mc only after DTIM beacon */
3003

3004
	while (1) {
3005
		skb = skb_dequeue(&ps->bc_buf);
3006
		if (!skb)
3007
			goto out;
3008 3009
		local->total_ps_buffered--;

3010
		if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) {
3011 3012 3013 3014 3015 3016 3017 3018 3019
			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);
		}

3020
		if (sdata->vif.type == NL80211_IFTYPE_AP)
3021
			sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev);
J
Johannes Berg 已提交
3022
		if (!ieee80211_tx_prepare(sdata, &tx, skb))
3023 3024 3025
			break;
		dev_kfree_skb_any(skb);
	}
3026 3027 3028

	info = IEEE80211_SKB_CB(skb);

3029
	tx.flags |= IEEE80211_TX_PS_BUFFERED;
3030
	info->band = chanctx_conf->def.chan->band;
3031

3032
	if (invoke_tx_handlers(&tx))
3033
		skb = NULL;
3034
 out:
3035
	rcu_read_unlock();
3036 3037 3038 3039

	return skb;
}
EXPORT_SYMBOL(ieee80211_get_buffered_bc);
J
Johannes Berg 已提交
3040

J
Johannes Berg 已提交
3041 3042 3043
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
3044
{
3045
	int ac = ieee802_1d_to_ac[tid & 7];
3046

J
Johannes Berg 已提交
3047 3048 3049 3050
	skb_set_mac_header(skb, 0);
	skb_set_network_header(skb, 0);
	skb_set_transport_header(skb, 0);

3051
	skb_set_queue_mapping(skb, ac);
3052
	skb->priority = tid;
3053

3054 3055
	skb->dev = sdata->dev;

3056 3057 3058 3059 3060 3061
	/*
	 * 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
3062
	ieee80211_xmit(sdata, skb, band);
3063
	local_bh_enable();
J
Johannes Berg 已提交
3064
}