tx.c 105.4 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 <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 inline void ieee80211_tx_stats(struct net_device *dev, u32 len)
{
	struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats);

	u64_stats_update_begin(&tstats->syncp);
	tstats->tx_packets++;
	tstats->tx_bytes += len;
	u64_stats_update_end(&tstats->syncp);
}

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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 | IEEE80211_TX_RC_VHT_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 */
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	if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS))
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		return TX_CONTINUE;

	/* hardware does dynamic power save */
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	if (ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS))
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		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->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 (ieee80211_hw_check(&tx->local->hw, QUEUE_CONTROL))
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		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 */
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	if (!ieee80211_hw_check(&tx->local->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);
549 550
	}

551
	return TX_CONTINUE;
552 553
}

554
static ieee80211_tx_result debug_noinline
555
ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx)
556
{
557
	if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED))
558
		return TX_CONTINUE;
559

560
	if (tx->flags & IEEE80211_TX_UNICAST)
561 562 563 564 565
		return ieee80211_tx_h_unicast_ps_buf(tx);
	else
		return ieee80211_tx_h_multicast_ps_buf(tx);
}

566 567 568 569 570
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);

571 572 573 574
	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;
575
		info->flags |= IEEE80211_TX_CTL_USE_MINRATE;
576
	}
577 578 579 580

	return TX_CONTINUE;
}

581
static ieee80211_tx_result debug_noinline
582
ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
583
{
584
	struct ieee80211_key *key;
585
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
586
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
587

J
Johannes Berg 已提交
588
	if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT))
589
		tx->key = NULL;
590 591
	else if (tx->sta &&
		 (key = rcu_dereference(tx->sta->ptk[tx->sta->ptk_idx])))
592
		tx->key = key;
593
	else if (ieee80211_is_mgmt(hdr->frame_control) &&
594
		 is_multicast_ether_addr(hdr->addr1) &&
595
		 ieee80211_is_robust_mgmt_frame(tx->skb) &&
596 597
		 (key = rcu_dereference(tx->sdata->default_mgmt_key)))
		tx->key = key;
598 599 600 601 602
	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)))
603
		tx->key = key;
604
	else
605
		tx->key = NULL;
606 607

	if (tx->key) {
608 609
		bool skip_hw = false;

610
		/* TODO: add threshold stuff again */
611

612 613 614 615
		switch (tx->key->conf.cipher) {
		case WLAN_CIPHER_SUITE_WEP40:
		case WLAN_CIPHER_SUITE_WEP104:
		case WLAN_CIPHER_SUITE_TKIP:
616
			if (!ieee80211_is_data_present(hdr->frame_control))
617 618
				tx->key = NULL;
			break;
619
		case WLAN_CIPHER_SUITE_CCMP:
J
Jouni Malinen 已提交
620
		case WLAN_CIPHER_SUITE_CCMP_256:
621 622
		case WLAN_CIPHER_SUITE_GCMP:
		case WLAN_CIPHER_SUITE_GCMP_256:
623 624 625 626
			if (!ieee80211_is_data_present(hdr->frame_control) &&
			    !ieee80211_use_mfp(hdr->frame_control, tx->sta,
					       tx->skb))
				tx->key = NULL;
627 628
			else
				skip_hw = (tx->key->conf.flags &
629
					   IEEE80211_KEY_FLAG_SW_MGMT_TX) &&
630
					ieee80211_is_mgmt(hdr->frame_control);
631
			break;
632
		case WLAN_CIPHER_SUITE_AES_CMAC:
633
		case WLAN_CIPHER_SUITE_BIP_CMAC_256:
634 635
		case WLAN_CIPHER_SUITE_BIP_GMAC_128:
		case WLAN_CIPHER_SUITE_BIP_GMAC_256:
636 637 638
			if (!ieee80211_is_mgmt(hdr->frame_control))
				tx->key = NULL;
			break;
639
		}
640

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

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

650
	return TX_CONTINUE;
651 652
}

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

763 764 765
	if (ratetbl)
		return TX_CONTINUE;

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

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

773 774 775
	return TX_CONTINUE;
}

776 777 778 779 780 781 782 783 784 785 786
static __le16 ieee80211_tx_next_seq(struct sta_info *sta, int tid)
{
	u16 *seq = &sta->tid_seq[tid];
	__le16 ret = cpu_to_le16(*seq);

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

	return ret;
}

787 788 789 790 791 792 793 794
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;
	u8 *qc;
	int tid;

795 796 797 798 799
	/*
	 * 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.
	 */
800
	if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR))
801 802
		return TX_CONTINUE;

803 804 805 806 807 808
	if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
		return TX_CONTINUE;

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

809 810 811
	if (ieee80211_is_qos_nullfunc(hdr->frame_control))
		return TX_CONTINUE;

J
Johannes Berg 已提交
812 813 814
	/*
	 * Anything but QoS data that has a sequence number field
	 * (is long enough) gets a sequence number from the global
815 816
	 * 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
817
	 */
818 819
	if (!ieee80211_is_data_qos(hdr->frame_control) ||
	    is_multicast_ether_addr(hdr->addr1)) {
J
Johannes Berg 已提交
820
		/* driver should assign sequence number */
821
		info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
J
Johannes Berg 已提交
822 823 824
		/* 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;
825 826
		if (tx->sta)
			tx->sta->tx_msdu[IEEE80211_NUM_TIDS]++;
827 828 829 830 831 832 833 834 835 836 837 838 839 840 841
		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;
842
	tx->sta->tx_msdu[tid]++;
843

844 845
	if (!tx->sta->sta.txq[0])
		hdr->seq_ctrl = ieee80211_tx_next_seq(tx->sta, tid);
846 847 848 849

	return TX_CONTINUE;
}

850
static int ieee80211_fragment(struct ieee80211_tx_data *tx,
J
Johannes Berg 已提交
851 852 853
			      struct sk_buff *skb, int hdrlen,
			      int frag_threshold)
{
854
	struct ieee80211_local *local = tx->local;
855
	struct ieee80211_tx_info *info;
856
	struct sk_buff *tmp;
J
Johannes Berg 已提交
857 858 859 860 861 862 863
	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;

864 865
	/* first fragment was already added to queue by caller */

J
Johannes Berg 已提交
866 867 868 869 870 871 872 873
	while (rem) {
		int fraglen = per_fragm;

		if (fraglen > rem)
			fraglen = rem;
		rem -= fraglen;
		tmp = dev_alloc_skb(local->tx_headroom +
				    frag_threshold +
874
				    tx->sdata->encrypt_headroom +
J
Johannes Berg 已提交
875 876 877
				    IEEE80211_ENCRYPT_TAILROOM);
		if (!tmp)
			return -ENOMEM;
878 879 880

		__skb_queue_tail(&tx->skbs, tmp);

881 882 883
		skb_reserve(tmp,
			    local->tx_headroom + tx->sdata->encrypt_headroom);

J
Johannes Berg 已提交
884 885
		/* copy control information */
		memcpy(tmp->cb, skb->cb, sizeof(tmp->cb));
886 887 888 889 890 891 892 893

		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
894 895 896 897 898 899 900 901 902 903 904
		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;
	}

905
	/* adjust first fragment's length */
906
	skb_trim(skb, hdrlen + per_fragm);
J
Johannes Berg 已提交
907 908 909
	return 0;
}

910
static ieee80211_tx_result debug_noinline
911 912
ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
{
J
Johannes Berg 已提交
913 914 915
	struct sk_buff *skb = tx->skb;
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
	struct ieee80211_hdr *hdr = (void *)skb->data;
916
	int frag_threshold = tx->local->hw.wiphy->frag_threshold;
J
Johannes Berg 已提交
917 918
	int hdrlen;
	int fragnum;
919

920 921 922 923
	/* no matter what happens, tx->skb moves to tx->skbs */
	__skb_queue_tail(&tx->skbs, skb);
	tx->skb = NULL;

924 925 926 927
	if (info->flags & IEEE80211_TX_CTL_DONTFRAG)
		return TX_CONTINUE;

	if (tx->local->ops->set_frag_threshold)
928 929
		return TX_CONTINUE;

930 931
	/*
	 * Warn when submitting a fragmented A-MPDU frame and drop it.
J
Johannes Berg 已提交
932
	 * This scenario is handled in ieee80211_tx_prepare but extra
933
	 * caution taken here as fragmented ampdu may cause Tx stop.
934
	 */
S
Sujith 已提交
935
	if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
936 937
		return TX_DROP;

938
	hdrlen = ieee80211_hdrlen(hdr->frame_control);
939

940
	/* internal error, why isn't DONTFRAG set? */
941
	if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))
J
Johannes Berg 已提交
942
		return TX_DROP;
943

J
Johannes Berg 已提交
944 945 946 947 948 949 950 951
	/*
	 * 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.
	 */
952
	if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold))
J
Johannes Berg 已提交
953
		return TX_DROP;
954

J
Johannes Berg 已提交
955 956
	/* update duration/seq/flags of fragments */
	fragnum = 0;
957 958

	skb_queue_walk(&tx->skbs, skb) {
J
Johannes Berg 已提交
959
		const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
960

J
Johannes Berg 已提交
961 962
		hdr = (void *)skb->data;
		info = IEEE80211_SKB_CB(skb);
963

964
		if (!skb_queue_is_last(&tx->skbs, skb)) {
J
Johannes Berg 已提交
965
			hdr->frame_control |= morefrags;
966 967 968 969 970 971 972
			/*
			 * 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;
973
			BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4);
974
			info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
J
Johannes Berg 已提交
975 976
		} else {
			hdr->frame_control &= ~morefrags;
977
		}
J
Johannes Berg 已提交
978 979
		hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG);
		fragnum++;
980
	}
981

982
	return TX_CONTINUE;
983 984
}

985 986 987
static ieee80211_tx_result debug_noinline
ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
{
988
	struct sk_buff *skb;
989
	int ac = -1;
990 991 992 993

	if (!tx->sta)
		return TX_CONTINUE;

994
	skb_queue_walk(&tx->skbs, skb) {
995 996
		ac = skb_get_queue_mapping(skb);
		tx->sta->tx_bytes[ac] += skb->len;
997
	}
998 999
	if (ac >= 0)
		tx->sta->tx_packets[ac]++;
1000 1001 1002 1003

	return TX_CONTINUE;
}

1004
static ieee80211_tx_result debug_noinline
1005 1006 1007 1008 1009
ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
{
	if (!tx->key)
		return TX_CONTINUE;

1010 1011 1012
	switch (tx->key->conf.cipher) {
	case WLAN_CIPHER_SUITE_WEP40:
	case WLAN_CIPHER_SUITE_WEP104:
1013
		return ieee80211_crypto_wep_encrypt(tx);
1014
	case WLAN_CIPHER_SUITE_TKIP:
1015
		return ieee80211_crypto_tkip_encrypt(tx);
1016
	case WLAN_CIPHER_SUITE_CCMP:
J
Jouni Malinen 已提交
1017 1018 1019 1020 1021
		return ieee80211_crypto_ccmp_encrypt(
			tx, IEEE80211_CCMP_MIC_LEN);
	case WLAN_CIPHER_SUITE_CCMP_256:
		return ieee80211_crypto_ccmp_encrypt(
			tx, IEEE80211_CCMP_256_MIC_LEN);
1022
	case WLAN_CIPHER_SUITE_AES_CMAC:
1023
		return ieee80211_crypto_aes_cmac_encrypt(tx);
1024 1025
	case WLAN_CIPHER_SUITE_BIP_CMAC_256:
		return ieee80211_crypto_aes_cmac_256_encrypt(tx);
1026 1027 1028
	case WLAN_CIPHER_SUITE_BIP_GMAC_128:
	case WLAN_CIPHER_SUITE_BIP_GMAC_256:
		return ieee80211_crypto_aes_gmac_encrypt(tx);
1029 1030 1031
	case WLAN_CIPHER_SUITE_GCMP:
	case WLAN_CIPHER_SUITE_GCMP_256:
		return ieee80211_crypto_gcmp_encrypt(tx);
1032
	default:
1033
		return ieee80211_crypto_hw_encrypt(tx);
1034 1035 1036 1037 1038
	}

	return TX_DROP;
}

1039
static ieee80211_tx_result debug_noinline
J
Johannes Berg 已提交
1040 1041
ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
{
1042
	struct sk_buff *skb;
J
Johannes Berg 已提交
1043 1044 1045
	struct ieee80211_hdr *hdr;
	int next_len;
	bool group_addr;
J
Johannes Berg 已提交
1046

1047
	skb_queue_walk(&tx->skbs, skb) {
J
Johannes Berg 已提交
1048
		hdr = (void *) skb->data;
1049 1050
		if (unlikely(ieee80211_is_pspoll(hdr->frame_control)))
			break; /* must not overwrite AID */
1051 1052 1053 1054 1055
		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
1056
		group_addr = is_multicast_ether_addr(hdr->addr1);
J
Johannes Berg 已提交
1057

J
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1058
		hdr->duration_id =
1059 1060
			ieee80211_duration(tx, skb, group_addr, next_len);
	}
J
Johannes Berg 已提交
1061 1062 1063 1064

	return TX_CONTINUE;
}

1065 1066
/* actual transmit path */

1067 1068 1069 1070 1071 1072 1073
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;
1074
	bool reset_agg_timer = false;
1075
	struct sk_buff *purge_skb = NULL;
1076 1077 1078

	if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
		info->flags |= IEEE80211_TX_CTL_AMPDU;
1079
		reset_agg_timer = true;
1080 1081 1082 1083 1084
	} 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
		 */
1085
	} else if (!tx->sta->sta.txq[tid]) {
1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104
		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
1105
		tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid);
1106 1107 1108 1109 1110

		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;
1111
			reset_agg_timer = true;
1112 1113 1114 1115
		} else {
			queued = true;
			info->control.vif = &tx->sdata->vif;
			info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1116 1117 1118
			info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS |
					IEEE80211_TX_CTL_NO_PS_BUFFER |
					IEEE80211_TX_STATUS_EOSP;
1119
			__skb_queue_tail(&tid_tx->pending, skb);
1120 1121
			if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER)
				purge_skb = __skb_dequeue(&tid_tx->pending);
1122 1123
		}
		spin_unlock(&tx->sta->lock);
1124 1125

		if (purge_skb)
1126
			ieee80211_free_txskb(&tx->local->hw, purge_skb);
1127 1128
	}

1129 1130
	/* reset session timer */
	if (reset_agg_timer && tid_tx->timeout)
1131
		tid_tx->last_tx = jiffies;
1132

1133 1134 1135
	return queued;
}

1136 1137
/*
 * initialises @tx
1138 1139
 * pass %NULL for the station if unknown, a valid pointer if known
 * or an ERR_PTR() if the station is known not to exist
1140
 */
1141
static ieee80211_tx_result
J
Johannes Berg 已提交
1142 1143
ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
		     struct ieee80211_tx_data *tx,
1144
		     struct sta_info *sta, struct sk_buff *skb)
1145
{
J
Johannes Berg 已提交
1146
	struct ieee80211_local *local = sdata->local;
1147
	struct ieee80211_hdr *hdr;
1148
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
J
Johannes Berg 已提交
1149
	int tid;
1150
	u8 *qc;
1151 1152 1153 1154

	memset(tx, 0, sizeof(*tx));
	tx->skb = skb;
	tx->local = local;
J
Johannes Berg 已提交
1155
	tx->sdata = sdata;
1156
	__skb_queue_head_init(&tx->skbs);
1157

1158 1159 1160 1161 1162 1163 1164
	/*
	 * 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;

1165 1166
	hdr = (struct ieee80211_hdr *) skb->data;

1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181
	if (likely(sta)) {
		if (!IS_ERR(sta))
			tx->sta = sta;
	} else {
		if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
			tx->sta = rcu_dereference(sdata->u.vlan.sta);
			if (!tx->sta && sdata->wdev.use_4addr)
				return TX_DROP;
		} else if (info->flags & (IEEE80211_TX_INTFL_NL80211_FRAME_TX |
					  IEEE80211_TX_CTL_INJECTED) ||
			   tx->sdata->control_port_protocol == tx->skb->protocol) {
			tx->sta = sta_info_get_bss(sdata, hdr->addr1);
		}
		if (!tx->sta && !is_multicast_ether_addr(hdr->addr1))
			tx->sta = sta_info_get(sdata, hdr->addr1);
1182
	}
1183

1184
	if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) &&
1185
	    !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
1186 1187
	    ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) &&
	    !ieee80211_hw_check(&local->hw, TX_AMPDU_SETUP_IN_HW)) {
1188 1189
		struct tid_ampdu_tx *tid_tx;

S
Sujith 已提交
1190 1191 1192
		qc = ieee80211_get_qos_ctl(hdr);
		tid = *qc & IEEE80211_QOS_CTL_TID_MASK;

1193 1194 1195
		tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
		if (tid_tx) {
			bool queued;
1196

1197 1198 1199 1200 1201 1202
			queued = ieee80211_tx_prep_agg(tx, skb, info,
						       tid_tx, tid);

			if (unlikely(queued))
				return TX_QUEUED;
		}
S
Sujith 已提交
1203 1204
	}

1205
	if (is_multicast_ether_addr(hdr->addr1)) {
1206
		tx->flags &= ~IEEE80211_TX_UNICAST;
1207
		info->flags |= IEEE80211_TX_CTL_NO_ACK;
1208
	} else
1209
		tx->flags |= IEEE80211_TX_UNICAST;
1210

1211 1212 1213 1214 1215
	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;
1216 1217
	}

1218
	if (!tx->sta)
1219
		info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
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Johannes Berg 已提交
1220
	else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT))
1221
		info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1222

1223
	info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
1224

1225
	return TX_CONTINUE;
1226 1227
}

1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317
static void ieee80211_drv_tx(struct ieee80211_local *local,
			     struct ieee80211_vif *vif,
			     struct ieee80211_sta *pubsta,
			     struct sk_buff *skb)
{
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
	struct ieee80211_tx_control control = {
		.sta = pubsta,
	};
	struct ieee80211_txq *txq = NULL;
	struct txq_info *txqi;
	u8 ac;

	if (info->control.flags & IEEE80211_TX_CTRL_PS_RESPONSE)
		goto tx_normal;

	if (!ieee80211_is_data(hdr->frame_control))
		goto tx_normal;

	if (pubsta) {
		u8 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK;

		txq = pubsta->txq[tid];
	} else if (vif) {
		txq = vif->txq;
	}

	if (!txq)
		goto tx_normal;

	ac = txq->ac;
	txqi = to_txq_info(txq);
	atomic_inc(&sdata->txqs_len[ac]);
	if (atomic_read(&sdata->txqs_len[ac]) >= local->hw.txq_ac_max_pending)
		netif_stop_subqueue(sdata->dev, ac);

	skb_queue_tail(&txqi->queue, skb);
	drv_wake_tx_queue(local, txqi);

	return;

tx_normal:
	drv_tx(local, &control, skb);
}

struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw,
				     struct ieee80211_txq *txq)
{
	struct ieee80211_local *local = hw_to_local(hw);
	struct ieee80211_sub_if_data *sdata = vif_to_sdata(txq->vif);
	struct txq_info *txqi = container_of(txq, struct txq_info, txq);
	struct ieee80211_hdr *hdr;
	struct sk_buff *skb = NULL;
	u8 ac = txq->ac;

	spin_lock_bh(&txqi->queue.lock);

	if (test_bit(IEEE80211_TXQ_STOP, &txqi->flags))
		goto out;

	skb = __skb_dequeue(&txqi->queue);
	if (!skb)
		goto out;

	atomic_dec(&sdata->txqs_len[ac]);
	if (__netif_subqueue_stopped(sdata->dev, ac))
		ieee80211_propagate_queue_wake(local, sdata->vif.hw_queue[ac]);

	hdr = (struct ieee80211_hdr *)skb->data;
	if (txq->sta && ieee80211_is_data_qos(hdr->frame_control)) {
		struct sta_info *sta = container_of(txq->sta, struct sta_info,
						    sta);
		struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);

		hdr->seq_ctrl = ieee80211_tx_next_seq(sta, txq->tid);
		if (test_bit(IEEE80211_TXQ_AMPDU, &txqi->flags))
			info->flags |= IEEE80211_TX_CTL_AMPDU;
		else
			info->flags &= ~IEEE80211_TX_CTL_AMPDU;
	}

out:
	spin_unlock_bh(&txqi->queue.lock);

	return skb;
}
EXPORT_SYMBOL(ieee80211_tx_dequeue);

1318 1319 1320 1321 1322
static bool ieee80211_tx_frags(struct ieee80211_local *local,
			       struct ieee80211_vif *vif,
			       struct ieee80211_sta *sta,
			       struct sk_buff_head *skbs,
			       bool txpending)
1323
{
1324
	struct sk_buff *skb, *tmp;
J
Johannes Berg 已提交
1325
	unsigned long flags;
1326

1327
	skb_queue_walk_safe(skbs, skb, tmp) {
1328 1329 1330 1331 1332 1333
		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);
1334
			ieee80211_free_txskb(&local->hw, skb);
1335 1336 1337
			continue;
		}
#endif
J
Johannes Berg 已提交
1338 1339 1340

		spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
		if (local->queue_stop_reasons[q] ||
1341
		    (!txpending && !skb_queue_empty(&local->pending[q]))) {
1342
			if (unlikely(info->flags &
1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360
				     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 {

1361
				/*
1362 1363 1364
				 * Since queue is stopped, queue up frames for
				 * later transmission from the tx-pending
				 * tasklet when the queue is woken again.
1365
				 */
1366 1367 1368 1369 1370 1371 1372 1373 1374 1375
				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;
1376
			}
1377
		}
J
Johannes Berg 已提交
1378
		spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1379

1380
		info->control.vif = vif;
1381

1382
		__skb_unlink(skb, skbs);
1383
		ieee80211_drv_tx(local, vif, sta, skb);
1384
	}
1385

1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402
	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;
1403

1404 1405
	if (WARN_ON(skb_queue_empty(skbs)))
		return true;
J
Johannes Berg 已提交
1406

1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420
	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:
1421 1422 1423 1424
		if (sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE) {
			vif = &sdata->vif;
			break;
		}
1425
		sdata = rcu_dereference(local->monitor_sdata);
1426
		if (sdata) {
1427
			vif = &sdata->vif;
1428 1429
			info->hw_queue =
				vif->hw_queue[skb_get_queue_mapping(skb)];
1430
		} else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) {
1431 1432 1433
			dev_kfree_skb(skb);
			return true;
		} else
1434
			vif = NULL;
1435 1436 1437 1438 1439 1440 1441 1442
		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;
1443
	}
J
Johannes Berg 已提交
1444

1445 1446
	result = ieee80211_tx_frags(local, vif, pubsta, skbs,
				    txpending);
1447

1448 1449
	ieee80211_tpt_led_trig_tx(local, fc, led_len);

J
Johannes Berg 已提交
1450
	WARN_ON_ONCE(!skb_queue_empty(skbs));
1451

1452
	return result;
1453 1454
}

1455 1456 1457 1458 1459 1460
/*
 * 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)
{
1461
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
1462 1463
	ieee80211_tx_result res = TX_DROP;

1464 1465 1466 1467 1468 1469 1470
#define CALL_TXH(txh) \
	do {				\
		res = txh(tx);		\
		if (res != TX_CONTINUE)	\
			goto txh_done;	\
	} while (0)

1471
	CALL_TXH(ieee80211_tx_h_dynamic_ps);
1472 1473
	CALL_TXH(ieee80211_tx_h_check_assoc);
	CALL_TXH(ieee80211_tx_h_ps_buf);
1474
	CALL_TXH(ieee80211_tx_h_check_control_port_protocol);
1475
	CALL_TXH(ieee80211_tx_h_select_key);
1476
	if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL))
1477
		CALL_TXH(ieee80211_tx_h_rate_ctrl);
1478

J
Johannes Berg 已提交
1479 1480 1481
	if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) {
		__skb_queue_tail(&tx->skbs, tx->skb);
		tx->skb = NULL;
1482
		goto txh_done;
J
Johannes Berg 已提交
1483
	}
1484 1485

	CALL_TXH(ieee80211_tx_h_michael_mic_add);
1486 1487
	CALL_TXH(ieee80211_tx_h_sequence);
	CALL_TXH(ieee80211_tx_h_fragment);
1488
	/* handlers after fragment must be aware of tx info fragmentation! */
1489 1490
	CALL_TXH(ieee80211_tx_h_stats);
	CALL_TXH(ieee80211_tx_h_encrypt);
1491
	if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL))
1492
		CALL_TXH(ieee80211_tx_h_calculate_duration);
1493
#undef CALL_TXH
1494

1495
 txh_done:
1496
	if (unlikely(res == TX_DROP)) {
1497
		I802_DEBUG_INC(tx->local->tx_handlers_drop);
1498
		if (tx->skb)
1499
			ieee80211_free_txskb(&tx->local->hw, tx->skb);
1500
		else
1501
			ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs);
1502 1503
		return -1;
	} else if (unlikely(res == TX_QUEUED)) {
1504
		I802_DEBUG_INC(tx->local->tx_handlers_queued);
1505 1506 1507 1508 1509 1510
		return -1;
	}

	return 0;
}

1511 1512 1513 1514 1515 1516 1517
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;
1518
	struct sk_buff *skb2;
1519

1520
	if (ieee80211_tx_prepare(sdata, &tx, NULL, skb) == TX_DROP)
1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536
		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;
	}

1537 1538 1539 1540 1541 1542 1543 1544
	/* this function isn't suitable for fragmented data frames */
	skb2 = __skb_dequeue(&tx.skbs);
	if (WARN_ON(skb2 != skb || !skb_queue_empty(&tx.skbs))) {
		ieee80211_free_txskb(hw, skb2);
		ieee80211_purge_tx_queue(hw, &tx.skbs);
		return false;
	}

1545 1546 1547 1548
	return true;
}
EXPORT_SYMBOL(ieee80211_tx_prepare_skb);

1549 1550 1551 1552
/*
 * Returns false if the frame couldn't be transmitted but was queued instead.
 */
static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata,
1553 1554
			 struct sta_info *sta, struct sk_buff *skb,
			 bool txpending)
1555
{
J
Johannes Berg 已提交
1556
	struct ieee80211_local *local = sdata->local;
1557
	struct ieee80211_tx_data tx;
1558
	ieee80211_tx_result res_prepare;
1559
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1560
	bool result = true;
1561
	int led_len;
1562 1563 1564

	if (unlikely(skb->len < 10)) {
		dev_kfree_skb(skb);
1565
		return true;
1566 1567
	}

1568
	/* initialises tx */
1569
	led_len = skb->len;
1570
	res_prepare = ieee80211_tx_prepare(sdata, &tx, sta, skb);
1571

1572
	if (unlikely(res_prepare == TX_DROP)) {
1573
		ieee80211_free_txskb(&local->hw, skb);
J
Johannes Berg 已提交
1574
		return true;
1575
	} else if (unlikely(res_prepare == TX_QUEUED)) {
J
Johannes Berg 已提交
1576
		return true;
1577 1578
	}

1579 1580
	/* set up hw_queue value early */
	if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) ||
1581
	    !ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
1582 1583 1584
		info->hw_queue =
			sdata->vif.hw_queue[skb_get_queue_mapping(skb)];

1585
	if (!invoke_tx_handlers(&tx))
1586 1587
		result = __ieee80211_tx(local, &tx.skbs, led_len,
					tx.sta, txpending);
J
Johannes Berg 已提交
1588

1589
	return result;
1590 1591 1592 1593
}

/* device xmit handlers */

1594
static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata,
1595 1596 1597
				struct sk_buff *skb,
				int head_need, bool may_encrypt)
{
1598
	struct ieee80211_local *local = sdata->local;
1599 1600
	int tail_need = 0;

1601
	if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) {
1602 1603 1604 1605 1606
		tail_need = IEEE80211_ENCRYPT_TAILROOM;
		tail_need -= skb_tailroom(skb);
		tail_need = max_t(int, tail_need, 0);
	}

1607
	if (skb_cloned(skb) &&
1608
	    (!ieee80211_hw_check(&local->hw, SUPPORTS_CLONED_SKBS) ||
1609
	     !skb_clone_writable(skb, ETH_HLEN) ||
J
Johannes Berg 已提交
1610
	     (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt)))
1611
		I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1612
	else if (head_need || tail_need)
1613
		I802_DEBUG_INC(local->tx_expand_skb_head);
1614 1615
	else
		return 0;
1616 1617

	if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
J
Joe Perches 已提交
1618 1619
		wiphy_debug(local->hw.wiphy,
			    "failed to reallocate TX buffer\n");
1620 1621 1622 1623 1624 1625
		return -ENOMEM;
	}

	return 0;
}

1626 1627
void ieee80211_xmit(struct ieee80211_sub_if_data *sdata,
		    struct sta_info *sta, struct sk_buff *skb)
1628
{
J
Johannes Berg 已提交
1629
	struct ieee80211_local *local = sdata->local;
1630
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1631
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1632
	int headroom;
1633
	bool may_encrypt;
1634

J
Johannes Berg 已提交
1635
	may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT);
1636

J
Johannes Berg 已提交
1637
	headroom = local->tx_headroom;
1638
	if (may_encrypt)
1639
		headroom += sdata->encrypt_headroom;
1640 1641 1642
	headroom -= skb_headroom(skb);
	headroom = max_t(int, 0, headroom);

1643
	if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) {
1644
		ieee80211_free_txskb(&local->hw, skb);
J
Johannes Berg 已提交
1645
		return;
1646 1647
	}

1648
	hdr = (struct ieee80211_hdr *) skb->data;
1649
	info->control.vif = &sdata->vif;
1650

M
Marco Porsch 已提交
1651 1652 1653
	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
1654
			if (mesh_nexthop_resolve(sdata, skb))
M
Marco Porsch 已提交
1655 1656 1657 1658
				return; /* skb queued: don't free */
		} else {
			ieee80211_mps_set_frame_flags(sdata, NULL, hdr);
		}
1659
	}
1660

1661
	ieee80211_set_qos_hdr(sdata, skb);
1662
	ieee80211_tx(sdata, sta, skb, false);
1663 1664
}

1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747
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;
}

1748 1749
netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
					 struct net_device *dev)
1750 1751
{
	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
J
Johannes Berg 已提交
1752
	struct ieee80211_chanctx_conf *chanctx_conf;
1753 1754
	struct ieee80211_radiotap_header *prthdr =
		(struct ieee80211_radiotap_header *)skb->data;
J
Johannes Berg 已提交
1755
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1756
	struct ieee80211_hdr *hdr;
J
Johannes Berg 已提交
1757
	struct ieee80211_sub_if_data *tmp_sdata, *sdata;
1758
	struct cfg80211_chan_def *chandef;
1759
	u16 len_rthdr;
J
Johannes Berg 已提交
1760
	int hdrlen;
1761

1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775
	/* 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 */
1776 1777 1778 1779 1780 1781 1782

	/*
	 * 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
	 */
1783
	skb_set_mac_header(skb, len_rthdr);
1784
	/*
1785 1786
	 * 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
1787
	 */
1788 1789
	skb_set_network_header(skb, len_rthdr);
	skb_set_transport_header(skb, len_rthdr);
1790

J
Johannes Berg 已提交
1791 1792 1793 1794 1795 1796 1797 1798 1799
	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;

1800 1801 1802 1803
	/*
	 * Initialize skb->protocol if the injected frame is a data frame
	 * carrying a rfc1042 header
	 */
J
Johannes Berg 已提交
1804 1805 1806 1807
	if (ieee80211_is_data(hdr->frame_control) &&
	    skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) {
		u8 *payload = (u8 *)hdr + hdrlen;

1808
		if (ether_addr_equal(payload, rfc1042_header))
J
Johannes Berg 已提交
1809 1810
			skb->protocol = cpu_to_be16((payload[6] << 8) |
						    payload[7]);
1811 1812
	}

J
Johannes Berg 已提交
1813 1814
	memset(info, 0, sizeof(*info));

J
Johannes Berg 已提交
1815
	info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
1816 1817 1818 1819 1820
		      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
1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840

	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;
1841
		if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) {
J
Johannes Berg 已提交
1842 1843 1844 1845
			sdata = tmp_sdata;
			break;
		}
	}
1846

J
Johannes Berg 已提交
1847 1848 1849 1850 1851 1852 1853 1854
	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);
	}

1855
	if (chanctx_conf)
1856
		chandef = &chanctx_conf->def;
1857
	else if (!local->use_chanctx)
1858
		chandef = &local->_oper_chandef;
1859 1860
	else
		goto fail_rcu;
J
Johannes Berg 已提交
1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877

	/*
	 * 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.
	 */
1878 1879
	if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef,
				     sdata->vif.type))
J
Johannes Berg 已提交
1880 1881
		goto fail_rcu;

1882
	info->band = chandef->chan->band;
1883
	ieee80211_xmit(sdata, NULL, skb);
J
Johannes Berg 已提交
1884 1885
	rcu_read_unlock();

1886
	return NETDEV_TX_OK;
1887

J
Johannes Berg 已提交
1888 1889
fail_rcu:
	rcu_read_unlock();
1890 1891 1892
fail:
	dev_kfree_skb(skb);
	return NETDEV_TX_OK; /* meaning, we dealt with the skb */
1893 1894
}

1895
static inline bool ieee80211_is_tdls_setup(struct sk_buff *skb)
1896
{
1897
	u16 ethertype = (skb->data[12] << 8) | skb->data[13];
1898

1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977
	return ethertype == ETH_P_TDLS &&
	       skb->len > 14 &&
	       skb->data[14] == WLAN_TDLS_SNAP_RFTYPE;
}

static int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data *sdata,
				   struct sk_buff *skb,
				   struct sta_info **sta_out)
{
	struct sta_info *sta;

	switch (sdata->vif.type) {
	case NL80211_IFTYPE_AP_VLAN:
		sta = rcu_dereference(sdata->u.vlan.sta);
		if (sta) {
			*sta_out = sta;
			return 0;
		} else if (sdata->wdev.use_4addr) {
			return -ENOLINK;
		}
		/* fall through */
	case NL80211_IFTYPE_AP:
	case NL80211_IFTYPE_OCB:
	case NL80211_IFTYPE_ADHOC:
		if (is_multicast_ether_addr(skb->data)) {
			*sta_out = ERR_PTR(-ENOENT);
			return 0;
		}
		sta = sta_info_get_bss(sdata, skb->data);
		break;
	case NL80211_IFTYPE_WDS:
		sta = sta_info_get(sdata, sdata->u.wds.remote_addr);
		break;
#ifdef CONFIG_MAC80211_MESH
	case NL80211_IFTYPE_MESH_POINT:
		/* determined much later */
		*sta_out = NULL;
		return 0;
#endif
	case NL80211_IFTYPE_STATION:
		if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
			sta = sta_info_get(sdata, skb->data);
			if (sta) {
				bool tdls_peer, tdls_auth;

				tdls_peer = test_sta_flag(sta,
							  WLAN_STA_TDLS_PEER);
				tdls_auth = test_sta_flag(sta,
						WLAN_STA_TDLS_PEER_AUTH);

				if (tdls_peer && tdls_auth) {
					*sta_out = sta;
					return 0;
				}

				/*
				 * TDLS link during setup - throw out frames to
				 * peer. 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 &&
				    !ieee80211_is_tdls_setup(skb))
					return -EINVAL;
			}

		}

		sta = sta_info_get(sdata, sdata->u.mgd.bssid);
		if (!sta)
			return -ENOLINK;
		break;
	default:
		return -EINVAL;
	}

	*sta_out = sta ?: ERR_PTR(-ENOENT);
	return 0;
1978 1979
}

1980
/**
1981 1982 1983
 * ieee80211_build_hdr - build 802.11 header in the given frame
 * @sdata: virtual interface to build the header for
 * @skb: the skb to build the header in
1984
 * @info_flags: skb flags to set
1985
 *
1986 1987 1988 1989 1990 1991 1992
 * This function takes the skb with 802.3 header and reformats the header to
 * the appropriate IEEE 802.11 header based on which interface the packet is
 * being transmitted on.
 *
 * Note that this function also takes care of the TX status request and
 * potential unsharing of the SKB - this needs to be interleaved with the
 * header building.
1993
 *
1994 1995 1996
 * The function requires the read-side RCU lock held
 *
 * Returns: the (possibly reallocated) skb or an ERR_PTR() code
1997
 */
1998
static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata,
1999
					   struct sk_buff *skb, u32 info_flags,
2000
					   struct sta_info *sta)
2001
{
2002
	struct ieee80211_local *local = sdata->local;
2003
	struct ieee80211_tx_info *info;
2004
	int head_need;
2005 2006
	u16 ethertype, hdrlen,  meshhdrlen = 0;
	__le16 fc;
2007
	struct ieee80211_hdr hdr;
2008
	struct ieee80211s_hdr mesh_hdr __maybe_unused;
2009
	struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL;
2010 2011
	const u8 *encaps_data;
	int encaps_len, skip_header_bytes;
2012
	int nh_pos, h_pos;
2013 2014
	bool wme_sta = false, authorized = false;
	bool tdls_peer;
J
Johannes Berg 已提交
2015 2016
	bool multicast;
	u16 info_id = 0;
J
Johannes Berg 已提交
2017 2018 2019
	struct ieee80211_chanctx_conf *chanctx_conf;
	struct ieee80211_sub_if_data *ap_sdata;
	enum ieee80211_band band;
2020
	int ret;
2021

2022 2023 2024
	if (IS_ERR(sta))
		sta = NULL;

2025 2026 2027
	/* convert Ethernet header to proper 802.11 header (based on
	 * operation mode) */
	ethertype = (skb->data[12] << 8) | skb->data[13];
2028
	fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
2029

2030
	switch (sdata->vif.type) {
2031
	case NL80211_IFTYPE_AP_VLAN:
2032
		if (sdata->wdev.use_4addr) {
2033 2034 2035
			fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
			/* RA TA DA SA */
			memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN);
2036
			memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2037 2038 2039
			memcpy(hdr.addr3, skb->data, ETH_ALEN);
			memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
			hdrlen = 30;
J
Johannes Berg 已提交
2040
			authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
2041
			wme_sta = sta->sta.wme;
2042
		}
J
Johannes Berg 已提交
2043 2044 2045
		ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
					u.ap);
		chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf);
2046 2047 2048 2049
		if (!chanctx_conf) {
			ret = -ENOTCONN;
			goto free;
		}
2050
		band = chanctx_conf->def.chan->band;
2051
		if (sdata->wdev.use_4addr)
2052 2053 2054
			break;
		/* fall through */
	case NL80211_IFTYPE_AP:
A
Arnd Bergmann 已提交
2055 2056
		if (sdata->vif.type == NL80211_IFTYPE_AP)
			chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2057 2058 2059 2060
		if (!chanctx_conf) {
			ret = -ENOTCONN;
			goto free;
		}
2061
		fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
2062 2063
		/* DA BSSID SA */
		memcpy(hdr.addr1, skb->data, ETH_ALEN);
2064
		memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2065 2066
		memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
		hdrlen = 24;
2067
		band = chanctx_conf->def.chan->band;
2068
		break;
2069
	case NL80211_IFTYPE_WDS:
2070
		fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
2071 2072
		/* RA TA DA SA */
		memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
2073
		memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2074 2075 2076
		memcpy(hdr.addr3, skb->data, ETH_ALEN);
		memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
		hdrlen = 30;
J
Johannes Berg 已提交
2077 2078 2079 2080
		/*
		 * This is the exception! WDS style interfaces are prohibited
		 * when channel contexts are in used so this must be valid
		 */
2081
		band = local->hw.conf.chandef.chan->band;
2082
		break;
2083
#ifdef CONFIG_MAC80211_MESH
2084
	case NL80211_IFTYPE_MESH_POINT:
2085
		if (!is_multicast_ether_addr(skb->data)) {
2086 2087 2088
			struct sta_info *next_hop;
			bool mpp_lookup = true;

J
Johannes Berg 已提交
2089
			mpath = mesh_path_lookup(sdata, skb->data);
2090 2091 2092 2093 2094 2095 2096 2097 2098 2099
			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
2100
				mppath = mpp_path_lookup(sdata, skb->data);
2101 2102 2103

			if (mppath && mpath)
				mesh_path_del(mpath->sdata, mpath->dst);
2104
		}
2105

2106
		/*
2107 2108 2109 2110
		 * 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)
2111
		 */
2112 2113
		if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) &&
		    !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) {
2114 2115
			hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
					skb->data, skb->data + ETH_ALEN);
J
Johannes Berg 已提交
2116 2117
			meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr,
							       NULL, NULL);
2118
		} else {
2119 2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130
			/* 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;
2131

2132
			hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
2133
					mesh_da, sdata->vif.addr);
2134 2135
			if (is_multicast_ether_addr(mesh_da))
				/* DA TA mSA AE:SA */
J
Johannes Berg 已提交
2136 2137 2138
				meshhdrlen = ieee80211_new_mesh_header(
						sdata, &mesh_hdr,
						skb->data + ETH_ALEN, NULL);
2139
			else
2140
				/* RA TA mDA mSA AE:DA SA */
J
Johannes Berg 已提交
2141 2142 2143
				meshhdrlen = ieee80211_new_mesh_header(
						sdata, &mesh_hdr, skb->data,
						skb->data + ETH_ALEN);
2144 2145

		}
J
Johannes Berg 已提交
2146
		chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2147 2148 2149 2150
		if (!chanctx_conf) {
			ret = -ENOTCONN;
			goto free;
		}
2151
		band = chanctx_conf->def.chan->band;
2152 2153
		break;
#endif
2154
	case NL80211_IFTYPE_STATION:
2155 2156
		/* we already did checks when looking up the RA STA */
		tdls_peer = test_sta_flag(sta, WLAN_STA_TDLS_PEER);
2157

2158
		if (tdls_peer) {
2159 2160 2161 2162 2163 2164 2165 2166 2167
			/* 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);
2168
			/* RA TA DA SA */
2169
			memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
2170
			memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2171 2172 2173 2174 2175 2176
			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 */
2177
			memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
2178 2179 2180 2181
			memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
			memcpy(hdr.addr3, skb->data, ETH_ALEN);
			hdrlen = 24;
		}
J
Johannes Berg 已提交
2182
		chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2183 2184 2185 2186
		if (!chanctx_conf) {
			ret = -ENOTCONN;
			goto free;
		}
2187
		band = chanctx_conf->def.chan->band;
2188
		break;
2189 2190 2191 2192 2193 2194 2195
	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);
2196 2197 2198 2199
		if (!chanctx_conf) {
			ret = -ENOTCONN;
			goto free;
		}
2200 2201
		band = chanctx_conf->def.chan->band;
		break;
2202
	case NL80211_IFTYPE_ADHOC:
2203 2204 2205
		/* DA SA BSSID */
		memcpy(hdr.addr1, skb->data, ETH_ALEN);
		memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2206
		memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN);
2207
		hdrlen = 24;
J
Johannes Berg 已提交
2208
		chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2209 2210 2211 2212
		if (!chanctx_conf) {
			ret = -ENOTCONN;
			goto free;
		}
2213
		band = chanctx_conf->def.chan->band;
2214 2215
		break;
	default:
2216 2217
		ret = -EINVAL;
		goto free;
2218 2219
	}

J
Johannes Berg 已提交
2220
	multicast = is_multicast_ether_addr(hdr.addr1);
2221

2222 2223 2224 2225 2226 2227
	/* sta is always NULL for mesh */
	if (sta) {
		authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
		wme_sta = sta->sta.wme;
	} else if (ieee80211_vif_is_mesh(&sdata->vif)) {
		/* For mesh, the use of the QoS header is mandatory */
J
Johannes Berg 已提交
2228
		wme_sta = true;
2229
	}
2230

2231 2232
	/* receiver does QoS (which also means we do) use it */
	if (wme_sta) {
2233
		fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
2234 2235 2236 2237
		hdrlen += 2;
	}

	/*
2238 2239
	 * Drop unicast frames to unauthorised stations unless they are
	 * EAPOL frames from the local station.
2240
	 */
2241
	if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) &&
2242
		     (sdata->vif.type != NL80211_IFTYPE_OCB) &&
2243
		     !multicast && !authorized &&
2244
		     (cpu_to_be16(ethertype) != sdata->control_port_protocol ||
2245
		      !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) {
2246
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
J
Johannes Berg 已提交
2247
		net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n",
2248
				    sdata->name, hdr.addr1);
2249 2250 2251 2252
#endif

		I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);

2253 2254
		ret = -EPERM;
		goto free;
2255 2256
	}

J
Johannes Berg 已提交
2257 2258
	if (unlikely(!multicast && skb->sk &&
		     skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) {
2259
		struct sk_buff *ack_skb = skb_clone_sk(skb);
J
Johannes Berg 已提交
2260

2261
		if (ack_skb) {
J
Johannes Berg 已提交
2262
			unsigned long flags;
T
Tejun Heo 已提交
2263
			int id;
J
Johannes Berg 已提交
2264 2265

			spin_lock_irqsave(&local->ack_status_lock, flags);
2266
			id = idr_alloc(&local->ack_status_frames, ack_skb,
T
Tejun Heo 已提交
2267
				       1, 0x10000, GFP_ATOMIC);
J
Johannes Berg 已提交
2268 2269
			spin_unlock_irqrestore(&local->ack_status_lock, flags);

T
Tejun Heo 已提交
2270
			if (id >= 0) {
J
Johannes Berg 已提交
2271 2272 2273
				info_id = id;
				info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
			} else {
2274
				kfree_skb(ack_skb);
J
Johannes Berg 已提交
2275 2276 2277 2278
			}
		}
	}

2279 2280 2281 2282
	/*
	 * If the skb is shared we need to obtain our own copy.
	 */
	if (skb_shared(skb)) {
J
Johannes Berg 已提交
2283 2284 2285 2286 2287
		struct sk_buff *tmp_skb = skb;

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

2288
		skb = skb_clone(skb, GFP_ATOMIC);
2289 2290
		kfree_skb(tmp_skb);

2291 2292 2293 2294
		if (!skb) {
			ret = -ENOMEM;
			goto free;
		}
2295 2296
	}

2297
	hdr.frame_control = fc;
2298 2299 2300 2301 2302 2303 2304 2305
	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
2306
	} else if (ethertype >= ETH_P_802_3_MIN) {
2307 2308 2309 2310 2311 2312 2313 2314
		encaps_data = rfc1042_header;
		encaps_len = sizeof(rfc1042_header);
		skip_header_bytes -= 2;
	} else {
		encaps_data = NULL;
		encaps_len = 0;
	}

2315 2316 2317
	nh_pos = skb_network_header(skb) - skb->data;
	h_pos = skb_transport_header(skb) - skb->data;

2318 2319 2320 2321
	skb_pull(skb, skip_header_bytes);
	nh_pos -= skip_header_bytes;
	h_pos -= skip_header_bytes;

2322
	head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
2323

2324 2325 2326 2327 2328 2329 2330 2331 2332 2333 2334
	/*
	 * 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.
	 */
2335

2336
	if (head_need > 0 || skb_cloned(skb)) {
2337
		head_need += sdata->encrypt_headroom;
2338 2339
		head_need += local->tx_headroom;
		head_need = max_t(int, 0, head_need);
2340 2341
		if (ieee80211_skb_resize(sdata, skb, head_need, true)) {
			ieee80211_free_txskb(&local->hw, skb);
J
Johannes Berg 已提交
2342
			skb = NULL;
2343
			return ERR_PTR(-ENOMEM);
2344
		}
2345 2346 2347 2348 2349 2350 2351
	}

	if (encaps_data) {
		memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
		nh_pos += encaps_len;
		h_pos += encaps_len;
	}
2352

2353
#ifdef CONFIG_MAC80211_MESH
2354 2355 2356 2357 2358
	if (meshhdrlen > 0) {
		memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
		nh_pos += meshhdrlen;
		h_pos += meshhdrlen;
	}
2359
#endif
2360

2361
	if (ieee80211_is_data_qos(fc)) {
2362 2363
		__le16 *qos_control;

W
Weilong Chen 已提交
2364
		qos_control = (__le16 *) skb_push(skb, 2);
2365 2366 2367 2368 2369 2370 2371 2372 2373
		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);

2374 2375 2376 2377 2378 2379 2380 2381 2382 2383
	nh_pos += hdrlen;
	h_pos += hdrlen;

	/* 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);

2384
	info = IEEE80211_SKB_CB(skb);
J
Johannes Berg 已提交
2385 2386
	memset(info, 0, sizeof(*info));

J
Johannes Berg 已提交
2387 2388
	info->flags = info_flags;
	info->ack_frame_id = info_id;
2389
	info->band = band;
J
Johannes Berg 已提交
2390

2391 2392 2393 2394 2395 2396
	return skb;
 free:
	kfree_skb(skb);
	return ERR_PTR(ret);
}

J
Johannes Berg 已提交
2397 2398 2399 2400 2401 2402 2403 2404 2405 2406 2407 2408 2409 2410 2411 2412 2413 2414 2415 2416 2417 2418 2419 2420 2421 2422 2423 2424 2425 2426
/*
 * fast-xmit overview
 *
 * The core idea of this fast-xmit is to remove per-packet checks by checking
 * them out of band. ieee80211_check_fast_xmit() implements the out-of-band
 * checks that are needed to get the sta->fast_tx pointer assigned, after which
 * much less work can be done per packet. For example, fragmentation must be
 * disabled or the fast_tx pointer will not be set. All the conditions are seen
 * in the code here.
 *
 * Once assigned, the fast_tx data structure also caches the per-packet 802.11
 * header and other data to aid packet processing in ieee80211_xmit_fast().
 *
 * The most difficult part of this is that when any of these assumptions
 * change, an external trigger (i.e. a call to ieee80211_clear_fast_xmit(),
 * ieee80211_check_fast_xmit() or friends) is required to reset the data,
 * since the per-packet code no longer checks the conditions. This is reflected
 * by the calls to these functions throughout the rest of the code, and must be
 * maintained if any of the TX path checks change.
 */

void ieee80211_check_fast_xmit(struct sta_info *sta)
{
	struct ieee80211_fast_tx build = {}, *fast_tx = NULL, *old;
	struct ieee80211_local *local = sta->local;
	struct ieee80211_sub_if_data *sdata = sta->sdata;
	struct ieee80211_hdr *hdr = (void *)build.hdr;
	struct ieee80211_chanctx_conf *chanctx_conf;
	__le16 fc;

2427
	if (!ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT))
J
Johannes Berg 已提交
2428 2429 2430 2431 2432 2433 2434 2435 2436 2437 2438 2439 2440 2441 2442
		return;

	/* Locking here protects both the pointer itself, and against concurrent
	 * invocations winning data access races to, e.g., the key pointer that
	 * is used.
	 * Without it, the invocation of this function right after the key
	 * pointer changes wouldn't be sufficient, as another CPU could access
	 * the pointer, then stall, and then do the cache update after the CPU
	 * that invalidated the key.
	 * With the locking, such scenarios cannot happen as the check for the
	 * key and the fast-tx assignment are done atomically, so the CPU that
	 * modifies the key will either wait or other one will see the key
	 * cleared/changed already.
	 */
	spin_lock_bh(&sta->lock);
2443 2444
	if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) &&
	    !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) &&
J
Johannes Berg 已提交
2445 2446 2447 2448 2449 2450 2451 2452 2453 2454 2455 2456 2457 2458 2459
	    sdata->vif.type == NL80211_IFTYPE_STATION)
		goto out;

	if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED))
		goto out;

	if (test_sta_flag(sta, WLAN_STA_PS_STA) ||
	    test_sta_flag(sta, WLAN_STA_PS_DRIVER) ||
	    test_sta_flag(sta, WLAN_STA_PS_DELIVER))
		goto out;

	if (sdata->noack_map)
		goto out;

	/* fast-xmit doesn't handle fragmentation at all */
2460 2461
	if (local->hw.wiphy->frag_threshold != (u32)-1 &&
	    !local->ops->set_frag_threshold)
J
Johannes Berg 已提交
2462 2463 2464 2465 2466 2467 2468 2469 2470 2471 2472 2473 2474 2475
		goto out;

	rcu_read_lock();
	chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
	if (!chanctx_conf) {
		rcu_read_unlock();
		goto out;
	}
	build.band = chanctx_conf->def.chan->band;
	rcu_read_unlock();

	fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);

	switch (sdata->vif.type) {
2476 2477 2478 2479 2480 2481 2482
	case NL80211_IFTYPE_ADHOC:
		/* DA SA BSSID */
		build.da_offs = offsetof(struct ieee80211_hdr, addr1);
		build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
		memcpy(hdr->addr3, sdata->u.ibss.bssid, ETH_ALEN);
		build.hdr_len = 24;
		break;
J
Johannes Berg 已提交
2483 2484 2485 2486 2487 2488 2489 2490 2491 2492 2493 2494 2495 2496 2497 2498 2499 2500 2501 2502 2503 2504 2505 2506 2507 2508 2509 2510 2511 2512 2513 2514 2515 2516 2517 2518 2519 2520 2521 2522 2523 2524 2525 2526 2527 2528 2529 2530 2531 2532 2533 2534 2535 2536 2537 2538 2539 2540 2541 2542 2543 2544 2545 2546 2547 2548 2549 2550 2551
	case NL80211_IFTYPE_STATION:
		if (test_sta_flag(sta, WLAN_STA_TDLS_PEER)) {
			/* DA SA BSSID */
			build.da_offs = offsetof(struct ieee80211_hdr, addr1);
			build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
			memcpy(hdr->addr3, sdata->u.mgd.bssid, ETH_ALEN);
			build.hdr_len = 24;
			break;
		}

		if (sdata->u.mgd.use_4addr) {
			/* non-regular ethertype cannot use the fastpath */
			fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
					  IEEE80211_FCTL_TODS);
			/* RA TA DA SA */
			memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN);
			memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
			build.da_offs = offsetof(struct ieee80211_hdr, addr3);
			build.sa_offs = offsetof(struct ieee80211_hdr, addr4);
			build.hdr_len = 30;
			break;
		}
		fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
		/* BSSID SA DA */
		memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN);
		build.da_offs = offsetof(struct ieee80211_hdr, addr3);
		build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
		build.hdr_len = 24;
		break;
	case NL80211_IFTYPE_AP_VLAN:
		if (sdata->wdev.use_4addr) {
			fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
					  IEEE80211_FCTL_TODS);
			/* RA TA DA SA */
			memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN);
			memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
			build.da_offs = offsetof(struct ieee80211_hdr, addr3);
			build.sa_offs = offsetof(struct ieee80211_hdr, addr4);
			build.hdr_len = 30;
			break;
		}
		/* fall through */
	case NL80211_IFTYPE_AP:
		fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
		/* DA BSSID SA */
		build.da_offs = offsetof(struct ieee80211_hdr, addr1);
		memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
		build.sa_offs = offsetof(struct ieee80211_hdr, addr3);
		build.hdr_len = 24;
		break;
	default:
		/* not handled on fast-xmit */
		goto out;
	}

	if (sta->sta.wme) {
		build.hdr_len += 2;
		fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
	}

	/* We store the key here so there's no point in using rcu_dereference()
	 * but that's fine because the code that changes the pointers will call
	 * this function after doing so. For a single CPU that would be enough,
	 * for multiple see the comment above.
	 */
	build.key = rcu_access_pointer(sta->ptk[sta->ptk_idx]);
	if (!build.key)
		build.key = rcu_access_pointer(sdata->default_unicast_key);
	if (build.key) {
2552
		bool gen_iv, iv_spc, mmic;
J
Johannes Berg 已提交
2553 2554 2555

		gen_iv = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV;
		iv_spc = build.key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE;
2556
		mmic = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC;
J
Johannes Berg 已提交
2557 2558 2559 2560 2561 2562 2563 2564 2565 2566 2567 2568 2569 2570 2571 2572 2573 2574 2575 2576 2577 2578 2579 2580 2581 2582 2583 2584

		/* don't handle software crypto */
		if (!(build.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
			goto out;

		switch (build.key->conf.cipher) {
		case WLAN_CIPHER_SUITE_CCMP:
		case WLAN_CIPHER_SUITE_CCMP_256:
			/* add fixed key ID */
			if (gen_iv) {
				(build.hdr + build.hdr_len)[3] =
					0x20 | (build.key->conf.keyidx << 6);
				build.pn_offs = build.hdr_len;
			}
			if (gen_iv || iv_spc)
				build.hdr_len += IEEE80211_CCMP_HDR_LEN;
			break;
		case WLAN_CIPHER_SUITE_GCMP:
		case WLAN_CIPHER_SUITE_GCMP_256:
			/* add fixed key ID */
			if (gen_iv) {
				(build.hdr + build.hdr_len)[3] =
					0x20 | (build.key->conf.keyidx << 6);
				build.pn_offs = build.hdr_len;
			}
			if (gen_iv || iv_spc)
				build.hdr_len += IEEE80211_GCMP_HDR_LEN;
			break;
2585 2586 2587 2588 2589 2590 2591 2592 2593 2594 2595 2596 2597 2598 2599 2600 2601 2602 2603 2604 2605 2606
		case WLAN_CIPHER_SUITE_TKIP:
			/* cannot handle MMIC or IV generation in xmit-fast */
			if (mmic || gen_iv)
				goto out;
			if (iv_spc)
				build.hdr_len += IEEE80211_TKIP_IV_LEN;
			break;
		case WLAN_CIPHER_SUITE_WEP40:
		case WLAN_CIPHER_SUITE_WEP104:
			/* cannot handle IV generation in fast-xmit */
			if (gen_iv)
				goto out;
			if (iv_spc)
				build.hdr_len += IEEE80211_WEP_IV_LEN;
			break;
		case WLAN_CIPHER_SUITE_AES_CMAC:
		case WLAN_CIPHER_SUITE_BIP_CMAC_256:
		case WLAN_CIPHER_SUITE_BIP_GMAC_128:
		case WLAN_CIPHER_SUITE_BIP_GMAC_256:
			WARN(1,
			     "management cipher suite 0x%x enabled for data\n",
			     build.key->conf.cipher);
J
Johannes Berg 已提交
2607
			goto out;
2608 2609 2610 2611 2612 2613 2614 2615 2616 2617 2618 2619 2620
		default:
			/* we don't know how to generate IVs for this at all */
			if (WARN_ON(gen_iv))
				goto out;
			/* pure hardware keys are OK, of course */
			if (!(build.key->flags & KEY_FLAG_CIPHER_SCHEME))
				break;
			/* cipher scheme might require space allocation */
			if (iv_spc &&
			    build.key->conf.iv_len > IEEE80211_FAST_XMIT_MAX_IV)
				goto out;
			if (iv_spc)
				build.hdr_len += build.key->conf.iv_len;
J
Johannes Berg 已提交
2621 2622 2623 2624 2625 2626 2627 2628 2629 2630 2631 2632 2633 2634 2635 2636 2637 2638 2639 2640 2641 2642 2643 2644 2645 2646 2647 2648 2649 2650 2651 2652 2653 2654 2655 2656 2657 2658 2659 2660 2661 2662 2663 2664 2665 2666 2667 2668 2669 2670 2671 2672 2673 2674 2675 2676 2677 2678 2679 2680 2681 2682 2683 2684 2685 2686 2687 2688 2689 2690 2691 2692 2693 2694 2695 2696 2697 2698 2699 2700 2701 2702 2703 2704 2705 2706 2707 2708 2709 2710 2711 2712 2713 2714 2715 2716 2717 2718 2719
		}

		fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
	}

	hdr->frame_control = fc;

	memcpy(build.hdr + build.hdr_len,
	       rfc1042_header,  sizeof(rfc1042_header));
	build.hdr_len += sizeof(rfc1042_header);

	fast_tx = kmemdup(&build, sizeof(build), GFP_ATOMIC);
	/* if the kmemdup fails, continue w/o fast_tx */
	if (!fast_tx)
		goto out;

 out:
	/* we might have raced against another call to this function */
	old = rcu_dereference_protected(sta->fast_tx,
					lockdep_is_held(&sta->lock));
	rcu_assign_pointer(sta->fast_tx, fast_tx);
	if (old)
		kfree_rcu(old, rcu_head);
	spin_unlock_bh(&sta->lock);
}

void ieee80211_check_fast_xmit_all(struct ieee80211_local *local)
{
	struct sta_info *sta;

	rcu_read_lock();
	list_for_each_entry_rcu(sta, &local->sta_list, list)
		ieee80211_check_fast_xmit(sta);
	rcu_read_unlock();
}

void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_local *local = sdata->local;
	struct sta_info *sta;

	rcu_read_lock();

	list_for_each_entry_rcu(sta, &local->sta_list, list) {
		if (sdata != sta->sdata &&
		    (!sta->sdata->bss || sta->sdata->bss != sdata->bss))
			continue;
		ieee80211_check_fast_xmit(sta);
	}

	rcu_read_unlock();
}

void ieee80211_clear_fast_xmit(struct sta_info *sta)
{
	struct ieee80211_fast_tx *fast_tx;

	spin_lock_bh(&sta->lock);
	fast_tx = rcu_dereference_protected(sta->fast_tx,
					    lockdep_is_held(&sta->lock));
	RCU_INIT_POINTER(sta->fast_tx, NULL);
	spin_unlock_bh(&sta->lock);

	if (fast_tx)
		kfree_rcu(fast_tx, rcu_head);
}

static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata,
				struct net_device *dev, struct sta_info *sta,
				struct ieee80211_fast_tx *fast_tx,
				struct sk_buff *skb)
{
	struct ieee80211_local *local = sdata->local;
	u16 ethertype = (skb->data[12] << 8) | skb->data[13];
	int extra_head = fast_tx->hdr_len - (ETH_HLEN - 2);
	int hw_headroom = sdata->local->hw.extra_tx_headroom;
	struct ethhdr eth;
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
	struct ieee80211_hdr *hdr = (void *)fast_tx->hdr;
	struct ieee80211_tx_data tx;
	ieee80211_tx_result r;
	struct tid_ampdu_tx *tid_tx = NULL;
	u8 tid = IEEE80211_NUM_TIDS;

	/* control port protocol needs a lot of special handling */
	if (cpu_to_be16(ethertype) == sdata->control_port_protocol)
		return false;

	/* only RFC 1042 SNAP */
	if (ethertype < ETH_P_802_3_MIN)
		return false;

	/* don't handle TX status request here either */
	if (skb->sk && skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)
		return false;

	if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
		tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
		tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
2720 2721 2722 2723 2724 2725
		if (tid_tx) {
			if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state))
				return false;
			if (tid_tx->timeout)
				tid_tx->last_tx = jiffies;
		}
J
Johannes Berg 已提交
2726 2727 2728 2729 2730 2731 2732 2733 2734 2735 2736 2737 2738 2739
	}

	/* after this point (skb is modified) we cannot return false */

	if (skb_shared(skb)) {
		struct sk_buff *tmp_skb = skb;

		skb = skb_clone(skb, GFP_ATOMIC);
		kfree_skb(tmp_skb);

		if (!skb)
			return true;
	}

2740
	ieee80211_tx_stats(dev, skb->len + extra_head);
J
Johannes Berg 已提交
2741 2742 2743 2744 2745 2746 2747 2748 2749 2750 2751 2752 2753 2754 2755 2756 2757 2758 2759 2760 2761 2762 2763 2764 2765 2766 2767 2768 2769 2770 2771 2772 2773 2774 2775

	/* will not be crypto-handled beyond what we do here, so use false
	 * as the may-encrypt argument for the resize to not account for
	 * more room than we already have in 'extra_head'
	 */
	if (unlikely(ieee80211_skb_resize(sdata, skb,
					  max_t(int, extra_head + hw_headroom -
						     skb_headroom(skb), 0),
					  false))) {
		kfree_skb(skb);
		return true;
	}

	memcpy(&eth, skb->data, ETH_HLEN - 2);
	hdr = (void *)skb_push(skb, extra_head);
	memcpy(skb->data, fast_tx->hdr, fast_tx->hdr_len);
	memcpy(skb->data + fast_tx->da_offs, eth.h_dest, ETH_ALEN);
	memcpy(skb->data + fast_tx->sa_offs, eth.h_source, ETH_ALEN);

	memset(info, 0, sizeof(*info));
	info->band = fast_tx->band;
	info->control.vif = &sdata->vif;
	info->flags = IEEE80211_TX_CTL_FIRST_FRAGMENT |
		      IEEE80211_TX_CTL_DONTFRAG |
		      (tid_tx ? IEEE80211_TX_CTL_AMPDU : 0);

	if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
		*ieee80211_get_qos_ctl(hdr) = tid;
		hdr->seq_ctrl = ieee80211_tx_next_seq(sta, tid);
	} else {
		info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
		hdr->seq_ctrl = cpu_to_le16(sdata->sequence_number);
		sdata->sequence_number += 0x10;
	}

2776 2777 2778 2779 2780
	if (skb_shinfo(skb)->gso_size)
		sta->tx_msdu[tid] +=
			DIV_ROUND_UP(skb->len, skb_shinfo(skb)->gso_size);
	else
		sta->tx_msdu[tid]++;
J
Johannes Berg 已提交
2781 2782 2783 2784 2785 2786 2787 2788 2789 2790 2791 2792 2793 2794

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

	__skb_queue_head_init(&tx.skbs);

	tx.flags = IEEE80211_TX_UNICAST;
	tx.local = local;
	tx.sdata = sdata;
	tx.sta = sta;
	tx.key = fast_tx->key;

	if (fast_tx->key)
		info->control.hw_key = &fast_tx->key->conf;

2795
	if (!ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) {
J
Johannes Berg 已提交
2796 2797 2798 2799 2800 2801 2802 2803 2804 2805 2806 2807 2808 2809 2810 2811 2812 2813 2814 2815 2816 2817 2818 2819 2820 2821 2822
		tx.skb = skb;
		r = ieee80211_tx_h_rate_ctrl(&tx);
		skb = tx.skb;
		tx.skb = NULL;

		if (r != TX_CONTINUE) {
			if (r != TX_QUEUED)
				kfree_skb(skb);
			return true;
		}
	}

	/* statistics normally done by ieee80211_tx_h_stats (but that
	 * has to consider fragmentation, so is more complex)
	 */
	sta->tx_bytes[skb_get_queue_mapping(skb)] += skb->len;
	sta->tx_packets[skb_get_queue_mapping(skb)]++;

	if (fast_tx->pn_offs) {
		u64 pn;
		u8 *crypto_hdr = skb->data + fast_tx->pn_offs;

		switch (fast_tx->key->conf.cipher) {
		case WLAN_CIPHER_SUITE_CCMP:
		case WLAN_CIPHER_SUITE_CCMP_256:
		case WLAN_CIPHER_SUITE_GCMP:
		case WLAN_CIPHER_SUITE_GCMP_256:
2823
			pn = atomic64_inc_return(&fast_tx->key->conf.tx_pn);
J
Johannes Berg 已提交
2824 2825 2826 2827 2828 2829 2830 2831 2832 2833 2834 2835 2836 2837 2838 2839 2840 2841 2842
			crypto_hdr[0] = pn;
			crypto_hdr[1] = pn >> 8;
			crypto_hdr[4] = pn >> 16;
			crypto_hdr[5] = pn >> 24;
			crypto_hdr[6] = pn >> 32;
			crypto_hdr[7] = pn >> 40;
			break;
		}
	}

	if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
		sdata = container_of(sdata->bss,
				     struct ieee80211_sub_if_data, u.ap);

	__skb_queue_tail(&tx.skbs, skb);
	ieee80211_tx_frags(local, &sdata->vif, &sta->sta, &tx.skbs, false);
	return true;
}

2843 2844 2845 2846 2847
void __ieee80211_subif_start_xmit(struct sk_buff *skb,
				  struct net_device *dev,
				  u32 info_flags)
{
	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2848
	struct sta_info *sta;
2849
	struct sk_buff *next;
2850 2851 2852 2853 2854 2855 2856

	if (unlikely(skb->len < ETH_HLEN)) {
		kfree_skb(skb);
		return;
	}

	rcu_read_lock();
2857

2858 2859
	if (ieee80211_lookup_ra_sta(sdata, skb, &sta))
		goto out_free;
2860

J
Johannes Berg 已提交
2861 2862 2863 2864 2865 2866 2867 2868 2869 2870
	if (!IS_ERR_OR_NULL(sta)) {
		struct ieee80211_fast_tx *fast_tx;

		fast_tx = rcu_dereference(sta->fast_tx);

		if (fast_tx &&
		    ieee80211_xmit_fast(sdata, dev, sta, fast_tx, skb))
			goto out;
	}

2871 2872
	if (skb_is_gso(skb)) {
		struct sk_buff *segs;
2873

2874 2875
		segs = skb_gso_segment(skb, 0);
		if (IS_ERR(segs)) {
2876
			goto out_free;
2877 2878 2879 2880 2881 2882 2883 2884 2885 2886 2887 2888 2889 2890 2891 2892
		} else if (segs) {
			consume_skb(skb);
			skb = segs;
		}
	} else {
		/* we cannot process non-linear frames on this path */
		if (skb_linearize(skb)) {
			kfree_skb(skb);
			goto out;
		}

		/* the frame could be fragmented, software-encrypted, and other
		 * things so we cannot really handle checksum offload with it -
		 * fix it up in software before we handle anything else.
		 */
		if (skb->ip_summed == CHECKSUM_PARTIAL) {
2893 2894
			skb_set_transport_header(skb,
						 skb_checksum_start_offset(skb));
2895 2896 2897
			if (skb_checksum_help(skb))
				goto out_free;
		}
2898 2899
	}

2900 2901 2902 2903
	next = skb;
	while (next) {
		skb = next;
		next = skb->next;
2904

2905 2906 2907 2908 2909 2910
		skb->prev = NULL;
		skb->next = NULL;

		skb = ieee80211_build_hdr(sdata, skb, info_flags, sta);
		if (IS_ERR(skb))
			goto out;
2911

2912
		ieee80211_tx_stats(dev, skb->len);
2913 2914 2915

		ieee80211_xmit(sdata, sta, skb);
	}
2916 2917 2918
	goto out;
 out_free:
	kfree_skb(skb);
2919
 out:
J
Johannes Berg 已提交
2920
	rcu_read_unlock();
2921 2922
}

2923 2924 2925 2926 2927 2928 2929
/**
 * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs
 * @skb: packet to be sent
 * @dev: incoming interface
 *
 * On failure skb will be freed.
 */
2930 2931 2932 2933 2934 2935
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;
}
2936

2937 2938 2939 2940 2941 2942 2943 2944 2945
struct sk_buff *
ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata,
			      struct sk_buff *skb, u32 info_flags)
{
	struct ieee80211_hdr *hdr;
	struct ieee80211_tx_data tx = {
		.local = sdata->local,
		.sdata = sdata,
	};
2946
	struct sta_info *sta;
2947 2948 2949

	rcu_read_lock();

2950 2951 2952 2953 2954 2955 2956
	if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) {
		kfree_skb(skb);
		skb = ERR_PTR(-EINVAL);
		goto out;
	}

	skb = ieee80211_build_hdr(sdata, skb, info_flags, sta);
2957 2958 2959 2960 2961 2962 2963 2964 2965 2966 2967 2968 2969 2970 2971 2972 2973 2974
	if (IS_ERR(skb))
		goto out;

	hdr = (void *)skb->data;
	tx.sta = sta_info_get(sdata, hdr->addr1);
	tx.skb = skb;

	if (ieee80211_tx_h_select_key(&tx) != TX_CONTINUE) {
		rcu_read_unlock();
		kfree_skb(skb);
		return ERR_PTR(-EINVAL);
	}

out:
	rcu_read_unlock();
	return skb;
}

2975 2976 2977 2978
/*
 * ieee80211_clear_tx_pending may not be called in a context where
 * it is possible that it packets could come in again.
 */
2979 2980
void ieee80211_clear_tx_pending(struct ieee80211_local *local)
{
2981
	struct sk_buff *skb;
J
Johannes Berg 已提交
2982
	int i;
2983

2984 2985 2986 2987
	for (i = 0; i < local->hw.queues; i++) {
		while ((skb = skb_dequeue(&local->pending[i])) != NULL)
			ieee80211_free_txskb(&local->hw, skb);
	}
2988 2989
}

2990 2991 2992 2993 2994
/*
 * 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.
 */
2995 2996 2997 2998 2999 3000 3001
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;
3002
	bool result;
J
Johannes Berg 已提交
3003
	struct ieee80211_chanctx_conf *chanctx_conf;
3004

3005
	sdata = vif_to_sdata(info->control.vif);
3006 3007

	if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) {
J
Johannes Berg 已提交
3008 3009 3010 3011 3012
		chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
		if (unlikely(!chanctx_conf)) {
			dev_kfree_skb(skb);
			return true;
		}
3013
		info->band = chanctx_conf->def.chan->band;
3014
		result = ieee80211_tx(sdata, NULL, skb, true);
3015
	} else {
3016 3017 3018 3019 3020
		struct sk_buff_head skbs;

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

3021
		hdr = (struct ieee80211_hdr *)skb->data;
3022
		sta = sta_info_get(sdata, hdr->addr1);
3023

3024
		result = __ieee80211_tx(local, &skbs, skb->len, sta, true);
3025 3026 3027 3028 3029
	}

	return result;
}

3030
/*
J
Johannes Berg 已提交
3031
 * Transmit all pending packets. Called from tasklet.
3032
 */
3033 3034 3035
void ieee80211_tx_pending(unsigned long data)
{
	struct ieee80211_local *local = (struct ieee80211_local *)data;
3036
	unsigned long flags;
3037
	int i;
J
Johannes Berg 已提交
3038
	bool txok;
3039

3040
	rcu_read_lock();
3041

J
Johannes Berg 已提交
3042
	spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
3043 3044 3045 3046 3047
	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
3048
		if (local->queue_stop_reasons[i] ||
3049
		    skb_queue_empty(&local->pending[i]))
3050
			continue;
3051

3052
		while (!skb_queue_empty(&local->pending[i])) {
J
Johannes Berg 已提交
3053
			struct sk_buff *skb = __skb_dequeue(&local->pending[i]);
3054 3055
			struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);

3056
			if (WARN_ON(!info->control.vif)) {
3057
				ieee80211_free_txskb(&local->hw, skb);
3058 3059 3060
				continue;
			}

J
Johannes Berg 已提交
3061 3062 3063 3064 3065 3066 3067
			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)
3068
				break;
3069
		}
3070 3071

		if (skb_queue_empty(&local->pending[i]))
3072
			ieee80211_propagate_queue_wake(local, i);
3073
	}
J
Johannes Berg 已提交
3074
	spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
3075

3076
	rcu_read_unlock();
3077 3078 3079 3080
}

/* functions for drivers to get certain frames */

3081
static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
3082 3083
				       struct ps_data *ps, struct sk_buff *skb,
				       bool is_template)
3084 3085 3086 3087 3088 3089 3090
{
	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. */
3091
	if (atomic_read(&ps->num_sta_ps) > 0)
3092 3093
		/* in the hope that this is faster than
		 * checking byte-for-byte */
W
Weilong Chen 已提交
3094
		have_bits = !bitmap_empty((unsigned long *)ps->tim,
3095
					  IEEE80211_MAX_AID+1);
3096 3097 3098 3099 3100 3101
	if (!is_template) {
		if (ps->dtim_count == 0)
			ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1;
		else
			ps->dtim_count--;
	}
3102 3103 3104 3105

	tim = pos = (u8 *) skb_put(skb, 6);
	*pos++ = WLAN_EID_TIM;
	*pos++ = 4;
3106
	*pos++ = ps->dtim_count;
3107
	*pos++ = sdata->vif.bss_conf.dtim_period;
3108

3109
	if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf))
3110 3111
		aid0 = 1;

3112
	ps->dtim_bc_mc = aid0 == 1;
3113

3114 3115 3116 3117 3118 3119
	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++) {
3120
			if (ps->tim[i]) {
3121 3122 3123 3124 3125 3126
				n1 = i & 0xfe;
				break;
			}
		}
		n2 = n1;
		for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
3127
			if (ps->tim[i]) {
3128 3129 3130 3131 3132 3133 3134 3135
				n2 = i;
				break;
			}
		}

		/* Bitmap control */
		*pos++ = n1 | aid0;
		/* Part Virt Bitmap */
3136
		skb_put(skb, n2 - n1);
3137
		memcpy(pos, ps->tim + n1, n2 - n1 + 1);
3138 3139 3140 3141 3142 3143 3144 3145

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

3146
static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
3147 3148
				    struct ps_data *ps, struct sk_buff *skb,
				    bool is_template)
3149 3150 3151 3152 3153 3154 3155 3156 3157 3158 3159
{
	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) {
3160
		__ieee80211_beacon_add_tim(sdata, ps, skb, is_template);
3161
	} else {
J
Johannes Berg 已提交
3162
		spin_lock_bh(&local->tim_lock);
3163
		__ieee80211_beacon_add_tim(sdata, ps, skb, is_template);
J
Johannes Berg 已提交
3164
		spin_unlock_bh(&local->tim_lock);
3165 3166 3167 3168 3169
	}

	return 0;
}

3170 3171
static void ieee80211_set_csa(struct ieee80211_sub_if_data *sdata,
			      struct beacon_data *beacon)
3172 3173
{
	struct probe_resp *resp;
3174 3175
	u8 *beacon_data;
	size_t beacon_data_len;
3176
	int i;
3177
	u8 count = beacon->csa_current_counter;
3178 3179 3180 3181 3182 3183 3184 3185 3186 3187

	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;
3188 3189 3190 3191
	case NL80211_IFTYPE_MESH_POINT:
		beacon_data = beacon->head;
		beacon_data_len = beacon->head_len;
		break;
3192 3193 3194
	default:
		return;
	}
3195

3196
	rcu_read_lock();
3197
	for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; ++i) {
3198
		resp = rcu_dereference(sdata->u.ap.probe_resp);
3199

3200 3201 3202
		if (beacon->csa_counter_offsets[i]) {
			if (WARN_ON_ONCE(beacon->csa_counter_offsets[i] >=
					 beacon_data_len)) {
3203 3204 3205
				rcu_read_unlock();
				return;
			}
3206 3207

			beacon_data[beacon->csa_counter_offsets[i]] = count;
3208
		}
3209 3210 3211

		if (sdata->vif.type == NL80211_IFTYPE_AP && resp)
			resp->data[resp->csa_counter_offsets[i]] = count;
3212
	}
3213
	rcu_read_unlock();
3214 3215
}

3216 3217 3218 3219 3220 3221 3222 3223 3224 3225
static u8 __ieee80211_csa_update_counter(struct beacon_data *beacon)
{
	beacon->csa_current_counter--;

	/* the counter should never reach 0 */
	WARN_ON_ONCE(!beacon->csa_current_counter);

	return beacon->csa_current_counter;
}

3226 3227 3228
u8 ieee80211_csa_update_counter(struct ieee80211_vif *vif)
{
	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
3229 3230
	struct beacon_data *beacon = NULL;
	u8 count = 0;
3231

3232 3233 3234 3235 3236 3237 3238 3239 3240 3241 3242 3243
	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;

3244
	count = __ieee80211_csa_update_counter(beacon);
3245

3246 3247 3248
unlock:
	rcu_read_unlock();
	return count;
3249
}
3250
EXPORT_SYMBOL(ieee80211_csa_update_counter);
3251 3252 3253 3254 3255 3256 3257 3258 3259 3260 3261 3262 3263 3264 3265 3266 3267 3268 3269 3270 3271

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;
3272 3273 3274 3275 3276 3277 3278
	} else if (vif->type == NL80211_IFTYPE_ADHOC) {
		struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;

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

3279 3280 3281 3282 3283 3284 3285 3286 3287
		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;

3288 3289
		beacon_data = beacon->head;
		beacon_data_len = beacon->head_len;
3290 3291 3292 3293 3294
	} else {
		WARN_ON(1);
		goto out;
	}

3295 3296 3297
	if (!beacon->csa_counter_offsets[0])
		goto out;

3298
	if (WARN_ON_ONCE(beacon->csa_counter_offsets[0] > beacon_data_len))
3299 3300
		goto out;

3301
	if (beacon_data[beacon->csa_counter_offsets[0]] == 1)
3302 3303 3304 3305 3306 3307 3308 3309
		ret = true;
 out:
	rcu_read_unlock();

	return ret;
}
EXPORT_SYMBOL(ieee80211_csa_is_complete);

3310 3311 3312 3313 3314
static struct sk_buff *
__ieee80211_beacon_get(struct ieee80211_hw *hw,
		       struct ieee80211_vif *vif,
		       struct ieee80211_mutable_offsets *offs,
		       bool is_template)
3315 3316
{
	struct ieee80211_local *local = hw_to_local(hw);
3317
	struct beacon_data *beacon = NULL;
3318
	struct sk_buff *skb = NULL;
3319
	struct ieee80211_tx_info *info;
3320
	struct ieee80211_sub_if_data *sdata = NULL;
J
Johannes Berg 已提交
3321
	enum ieee80211_band band;
3322
	struct ieee80211_tx_rate_control txrc;
J
Johannes Berg 已提交
3323
	struct ieee80211_chanctx_conf *chanctx_conf;
3324
	int csa_off_base = 0;
3325

3326
	rcu_read_lock();
3327

3328
	sdata = vif_to_sdata(vif);
J
Johannes Berg 已提交
3329
	chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3330

J
Johannes Berg 已提交
3331
	if (!ieee80211_sdata_running(sdata) || !chanctx_conf)
3332 3333
		goto out;

3334 3335
	if (offs)
		memset(offs, 0, sizeof(*offs));
3336

3337
	if (sdata->vif.type == NL80211_IFTYPE_AP) {
3338 3339
		struct ieee80211_if_ap *ap = &sdata->u.ap;

3340
		beacon = rcu_dereference(ap->beacon);
D
Dan Carpenter 已提交
3341
		if (beacon) {
3342
			if (beacon->csa_counter_offsets[0]) {
3343
				if (!is_template)
3344
					__ieee80211_csa_update_counter(beacon);
3345 3346 3347

				ieee80211_set_csa(sdata, beacon);
			}
3348

J
Johannes Berg 已提交
3349 3350 3351 3352 3353 3354
			/*
			 * headroom, head length,
			 * tail length and maximum TIM length
			 */
			skb = dev_alloc_skb(local->tx_headroom +
					    beacon->head_len +
3355 3356
					    beacon->tail_len + 256 +
					    local->hw.extra_beacon_tailroom);
J
Johannes Berg 已提交
3357 3358
			if (!skb)
				goto out;
3359

J
Johannes Berg 已提交
3360 3361 3362
			skb_reserve(skb, local->tx_headroom);
			memcpy(skb_put(skb, beacon->head_len), beacon->head,
			       beacon->head_len);
3363

3364 3365
			ieee80211_beacon_add_tim(sdata, &ap->ps, skb,
						 is_template);
3366

3367 3368 3369
			if (offs) {
				offs->tim_offset = beacon->head_len;
				offs->tim_length = skb->len - beacon->head_len;
3370 3371 3372

				/* for AP the csa offsets are from tail */
				csa_off_base = skb->len;
3373
			}
3374

J
Johannes Berg 已提交
3375 3376 3377
			if (beacon->tail)
				memcpy(skb_put(skb, beacon->tail_len),
				       beacon->tail, beacon->tail_len);
3378 3379
		} else
			goto out;
3380
	} else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
3381
		struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
3382
		struct ieee80211_hdr *hdr;
3383

3384 3385
		beacon = rcu_dereference(ifibss->presp);
		if (!beacon)
3386 3387
			goto out;

3388
		if (beacon->csa_counter_offsets[0]) {
3389
			if (!is_template)
3390
				__ieee80211_csa_update_counter(beacon);
3391

3392
			ieee80211_set_csa(sdata, beacon);
3393
		}
3394

3395
		skb = dev_alloc_skb(local->tx_headroom + beacon->head_len +
3396
				    local->hw.extra_beacon_tailroom);
3397 3398
		if (!skb)
			goto out;
3399
		skb_reserve(skb, local->tx_headroom);
3400 3401
		memcpy(skb_put(skb, beacon->head_len), beacon->head,
		       beacon->head_len);
3402 3403

		hdr = (struct ieee80211_hdr *) skb->data;
3404 3405
		hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
						 IEEE80211_STYPE_BEACON);
J
Johannes Berg 已提交
3406
	} else if (ieee80211_vif_is_mesh(&sdata->vif)) {
3407
		struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
3408

3409 3410
		beacon = rcu_dereference(ifmsh->beacon);
		if (!beacon)
3411 3412
			goto out;

3413
		if (beacon->csa_counter_offsets[0]) {
3414 3415 3416 3417 3418 3419
			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.
				 */
3420
				__ieee80211_csa_update_counter(beacon);
3421

3422
			ieee80211_set_csa(sdata, beacon);
3423
		}
3424

3425
		if (ifmsh->sync_ops)
3426
			ifmsh->sync_ops->adjust_tbtt(sdata, beacon);
3427

3428
		skb = dev_alloc_skb(local->tx_headroom +
3429
				    beacon->head_len +
M
Marco Porsch 已提交
3430
				    256 + /* TIM IE */
3431
				    beacon->tail_len +
3432
				    local->hw.extra_beacon_tailroom);
J
Johannes Berg 已提交
3433 3434
		if (!skb)
			goto out;
T
Thomas Pedersen 已提交
3435
		skb_reserve(skb, local->tx_headroom);
3436 3437
		memcpy(skb_put(skb, beacon->head_len), beacon->head,
		       beacon->head_len);
3438 3439 3440
		ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb, is_template);

		if (offs) {
3441 3442
			offs->tim_offset = beacon->head_len;
			offs->tim_length = skb->len - beacon->head_len;
3443 3444
		}

3445 3446
		memcpy(skb_put(skb, beacon->tail_len), beacon->tail,
		       beacon->tail_len);
3447 3448
	} else {
		WARN_ON(1);
3449
		goto out;
3450 3451
	}

3452
	/* CSA offsets */
3453
	if (offs && beacon) {
3454 3455 3456
		int i;

		for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; i++) {
3457
			u16 csa_off = beacon->csa_counter_offsets[i];
3458 3459 3460 3461 3462 3463 3464 3465

			if (!csa_off)
				continue;

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

3466
	band = chanctx_conf->def.chan->band;
J
Johannes Berg 已提交
3467

3468 3469
	info = IEEE80211_SKB_CB(skb);

J
Johannes Berg 已提交
3470
	info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
3471
	info->flags |= IEEE80211_TX_CTL_NO_ACK;
3472
	info->band = band;
3473 3474 3475

	memset(&txrc, 0, sizeof(txrc));
	txrc.hw = hw;
3476
	txrc.sband = local->hw.wiphy->bands[band];
3477 3478 3479
	txrc.bss_conf = &sdata->vif.bss_conf;
	txrc.skb = skb;
	txrc.reported_rate.idx = -1;
3480
	txrc.rate_idx_mask = sdata->rc_rateidx_mask[band];
3481
	if (txrc.rate_idx_mask == (1 << txrc.sband->n_bitrates) - 1)
3482 3483 3484
		txrc.max_rate_idx = -1;
	else
		txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
3485
	txrc.bss = true;
3486
	rate_control_get_rate(sdata, NULL, &txrc);
3487 3488

	info->control.vif = vif;
3489

3490 3491 3492
	info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT |
			IEEE80211_TX_CTL_ASSIGN_SEQ |
			IEEE80211_TX_CTL_FIRST_FRAGMENT;
3493
 out:
3494
	rcu_read_unlock();
3495
	return skb;
3496 3497 3498 3499 3500 3501 3502 3503 3504 3505 3506 3507 3508 3509 3510 3511 3512 3513 3514 3515 3516 3517 3518 3519 3520 3521

}

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;
3522
}
3523
EXPORT_SYMBOL(ieee80211_beacon_get_tim);
3524

3525 3526 3527 3528
struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw,
					struct ieee80211_vif *vif)
{
	struct ieee80211_if_ap *ap = NULL;
3529 3530
	struct sk_buff *skb = NULL;
	struct probe_resp *presp = NULL;
3531 3532 3533 3534 3535 3536 3537 3538 3539 3540 3541 3542 3543
	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;

3544
	skb = dev_alloc_skb(presp->len);
3545 3546 3547
	if (!skb)
		goto out;

3548 3549
	memcpy(skb_put(skb, presp->len), presp->data, presp->len);

3550 3551 3552 3553 3554 3555 3556 3557 3558
	hdr = (struct ieee80211_hdr *) skb->data;
	memset(hdr->addr1, 0, sizeof(hdr->addr1));

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

3559 3560 3561 3562 3563 3564 3565 3566 3567 3568 3569 3570 3571 3572 3573 3574 3575
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));
3576
	if (!skb)
3577
		return NULL;
3578

3579 3580 3581 3582 3583 3584 3585 3586 3587 3588 3589 3590 3591 3592 3593 3594 3595 3596 3597 3598 3599 3600 3601 3602 3603 3604 3605 3606 3607 3608 3609 3610 3611 3612 3613
	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));
3614
	if (!skb)
3615
		return NULL;
3616

3617 3618 3619 3620 3621 3622 3623 3624 3625 3626 3627 3628 3629 3630 3631 3632
	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);

3633
struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw,
3634
				       const u8 *src_addr,
3635
				       const u8 *ssid, size_t ssid_len,
3636
				       size_t tailroom)
3637
{
3638
	struct ieee80211_local *local = hw_to_local(hw);
3639 3640 3641 3642 3643 3644 3645 3646
	struct ieee80211_hdr_3addr *hdr;
	struct sk_buff *skb;
	size_t ie_ssid_len;
	u8 *pos;

	ie_ssid_len = 2 + ssid_len;

	skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) +
3647
			    ie_ssid_len + tailroom);
3648
	if (!skb)
3649 3650 3651 3652 3653 3654 3655 3656
		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
3657
	eth_broadcast_addr(hdr->addr1);
3658
	memcpy(hdr->addr2, src_addr, ETH_ALEN);
J
Johannes Berg 已提交
3659
	eth_broadcast_addr(hdr->addr3);
3660 3661 3662 3663

	pos = skb_put(skb, ie_ssid_len);
	*pos++ = WLAN_EID_SSID;
	*pos++ = ssid_len;
3664
	if (ssid_len)
3665 3666 3667 3668 3669 3670 3671
		memcpy(pos, ssid, ssid_len);
	pos += ssid_len;

	return skb;
}
EXPORT_SYMBOL(ieee80211_probereq_get);

3672
void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
3673
		       const void *frame, size_t frame_len,
3674
		       const struct ieee80211_tx_info *frame_txctl,
3675 3676 3677 3678
		       struct ieee80211_rts *rts)
{
	const struct ieee80211_hdr *hdr = frame;

3679 3680
	rts->frame_control =
	    cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
3681 3682
	rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
					       frame_txctl);
3683 3684 3685 3686 3687
	memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
	memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
}
EXPORT_SYMBOL(ieee80211_rts_get);

3688
void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
3689
			     const void *frame, size_t frame_len,
3690
			     const struct ieee80211_tx_info *frame_txctl,
3691 3692 3693 3694
			     struct ieee80211_cts *cts)
{
	const struct ieee80211_hdr *hdr = frame;

3695 3696
	cts->frame_control =
	    cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
3697 3698
	cts->duration = ieee80211_ctstoself_duration(hw, vif,
						     frame_len, frame_txctl);
3699 3700 3701 3702 3703
	memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
}
EXPORT_SYMBOL(ieee80211_ctstoself_get);

struct sk_buff *
3704
ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
3705
			  struct ieee80211_vif *vif)
3706 3707
{
	struct ieee80211_local *local = hw_to_local(hw);
3708
	struct sk_buff *skb = NULL;
3709
	struct ieee80211_tx_data tx;
3710
	struct ieee80211_sub_if_data *sdata;
3711
	struct ps_data *ps;
3712
	struct ieee80211_tx_info *info;
J
Johannes Berg 已提交
3713
	struct ieee80211_chanctx_conf *chanctx_conf;
3714

3715
	sdata = vif_to_sdata(vif);
3716 3717

	rcu_read_lock();
J
Johannes Berg 已提交
3718
	chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3719

3720 3721 3722 3723 3724 3725 3726 3727 3728 3729 3730
	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
3731 3732
	} else if (ieee80211_vif_is_mesh(&sdata->vif)) {
		ps = &sdata->u.mesh.ps;
3733
	} else {
3734
		goto out;
3735
	}
3736

3737
	if (ps->dtim_count != 0 || !ps->dtim_bc_mc)
3738
		goto out; /* send buffered bc/mc only after DTIM beacon */
3739

3740
	while (1) {
3741
		skb = skb_dequeue(&ps->bc_buf);
3742
		if (!skb)
3743
			goto out;
3744 3745
		local->total_ps_buffered--;

3746
		if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) {
3747 3748 3749 3750 3751 3752 3753 3754 3755
			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);
		}

3756
		if (sdata->vif.type == NL80211_IFTYPE_AP)
3757
			sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev);
3758
		if (!ieee80211_tx_prepare(sdata, &tx, NULL, skb))
3759 3760 3761
			break;
		dev_kfree_skb_any(skb);
	}
3762 3763 3764

	info = IEEE80211_SKB_CB(skb);

3765
	tx.flags |= IEEE80211_TX_PS_BUFFERED;
3766
	info->band = chanctx_conf->def.chan->band;
3767

3768
	if (invoke_tx_handlers(&tx))
3769
		skb = NULL;
3770
 out:
3771
	rcu_read_unlock();
3772 3773 3774 3775

	return skb;
}
EXPORT_SYMBOL(ieee80211_get_buffered_bc);
J
Johannes Berg 已提交
3776

3777 3778 3779 3780 3781 3782 3783 3784 3785 3786 3787 3788 3789 3790 3791 3792 3793 3794 3795 3796 3797 3798 3799 3800 3801 3802 3803 3804 3805 3806 3807 3808 3809 3810 3811 3812 3813 3814 3815 3816 3817
int ieee80211_reserve_tid(struct ieee80211_sta *pubsta, u8 tid)
{
	struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
	struct ieee80211_sub_if_data *sdata = sta->sdata;
	struct ieee80211_local *local = sdata->local;
	int ret;
	u32 queues;

	lockdep_assert_held(&local->sta_mtx);

	/* only some cases are supported right now */
	switch (sdata->vif.type) {
	case NL80211_IFTYPE_STATION:
	case NL80211_IFTYPE_AP:
	case NL80211_IFTYPE_AP_VLAN:
		break;
	default:
		WARN_ON(1);
		return -EINVAL;
	}

	if (WARN_ON(tid >= IEEE80211_NUM_UPS))
		return -EINVAL;

	if (sta->reserved_tid == tid) {
		ret = 0;
		goto out;
	}

	if (sta->reserved_tid != IEEE80211_TID_UNRESERVED) {
		sdata_err(sdata, "TID reservation already active\n");
		ret = -EALREADY;
		goto out;
	}

	ieee80211_stop_vif_queues(sdata->local, sdata,
				  IEEE80211_QUEUE_STOP_REASON_RESERVE_TID);

	synchronize_net();

	/* Tear down BA sessions so we stop aggregating on this TID */
3818
	if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) {
3819 3820 3821 3822 3823 3824
		set_sta_flag(sta, WLAN_STA_BLOCK_BA);
		__ieee80211_stop_tx_ba_session(sta, tid,
					       AGG_STOP_LOCAL_REQUEST);
	}

	queues = BIT(sdata->vif.hw_queue[ieee802_1d_to_ac[tid]]);
3825
	__ieee80211_flush_queues(local, sdata, queues, false);
3826 3827 3828 3829 3830 3831

	sta->reserved_tid = tid;

	ieee80211_wake_vif_queues(local, sdata,
				  IEEE80211_QUEUE_STOP_REASON_RESERVE_TID);

3832
	if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION))
3833 3834 3835 3836 3837 3838 3839 3840 3841 3842 3843 3844 3845 3846 3847 3848 3849 3850 3851 3852 3853 3854 3855 3856 3857 3858 3859 3860 3861 3862 3863 3864 3865 3866 3867
		clear_sta_flag(sta, WLAN_STA_BLOCK_BA);

	ret = 0;
 out:
	return ret;
}
EXPORT_SYMBOL(ieee80211_reserve_tid);

void ieee80211_unreserve_tid(struct ieee80211_sta *pubsta, u8 tid)
{
	struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
	struct ieee80211_sub_if_data *sdata = sta->sdata;

	lockdep_assert_held(&sdata->local->sta_mtx);

	/* only some cases are supported right now */
	switch (sdata->vif.type) {
	case NL80211_IFTYPE_STATION:
	case NL80211_IFTYPE_AP:
	case NL80211_IFTYPE_AP_VLAN:
		break;
	default:
		WARN_ON(1);
		return;
	}

	if (tid != sta->reserved_tid) {
		sdata_err(sdata, "TID to unreserve (%d) isn't reserved\n", tid);
		return;
	}

	sta->reserved_tid = IEEE80211_TID_UNRESERVED;
}
EXPORT_SYMBOL(ieee80211_unreserve_tid);

J
Johannes Berg 已提交
3868 3869 3870
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
3871
{
3872
	int ac = ieee802_1d_to_ac[tid & 7];
3873

J
Johannes Berg 已提交
3874 3875 3876 3877
	skb_set_mac_header(skb, 0);
	skb_set_network_header(skb, 0);
	skb_set_transport_header(skb, 0);

3878
	skb_set_queue_mapping(skb, ac);
3879
	skb->priority = tid;
3880

3881 3882
	skb->dev = sdata->dev;

3883 3884 3885 3886 3887 3888
	/*
	 * 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();
3889
	IEEE80211_SKB_CB(skb)->band = band;
3890
	ieee80211_xmit(sdata, NULL, skb);
3891
	local_bh_enable();
J
Johannes Berg 已提交
3892
}