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 */
	if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS))
		return TX_CONTINUE;

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

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

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

	if (!local->ps_sdata)
		return TX_CONTINUE;

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

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

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

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

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

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

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

	return TX_CONTINUE;
}
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static ieee80211_tx_result debug_noinline
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ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx)
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{
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	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
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	bool assoc = false;
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	if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED))
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		return TX_CONTINUE;
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	if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) &&
	    test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) &&
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	    !ieee80211_is_probe_req(hdr->frame_control) &&
	    !ieee80211_is_nullfunc(hdr->frame_control))
		/*
		 * When software scanning only nullfunc frames (to notify
		 * the sleep state to the AP) and probe requests (for the
		 * active scan) are allowed, all other frames should not be
		 * sent and we should not get here, but if we do
		 * nonetheless, drop them to avoid sending them
		 * off-channel. See the link below and
		 * ieee80211_start_scan() for more.
		 *
		 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089
		 */
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		return TX_DROP;
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	if (tx->sdata->vif.type == NL80211_IFTYPE_OCB)
		return TX_CONTINUE;

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	if (tx->sdata->vif.type == NL80211_IFTYPE_WDS)
		return TX_CONTINUE;

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

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

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	return TX_CONTINUE;
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}

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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	if (!ieee80211_is_robust_mgmt_frame(skb))
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		return 0;

	return 1;
}

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

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

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

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

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

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		return TX_QUEUED;
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	} else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) {
		ps_dbg(tx->sdata,
		       "STA %pM in PS mode, but polling/in SP -> send frame\n",
		       sta->sta.addr);
552 553
	}

554
	return TX_CONTINUE;
555 556
}

557
static ieee80211_tx_result debug_noinline
558
ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx)
559
{
560
	if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED))
561
		return TX_CONTINUE;
562

563
	if (tx->flags & IEEE80211_TX_UNICAST)
564 565 566 567 568
		return ieee80211_tx_h_unicast_ps_buf(tx);
	else
		return ieee80211_tx_h_multicast_ps_buf(tx);
}

569 570 571 572 573
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);

574 575 576 577
	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;
578
		info->flags |= IEEE80211_TX_CTL_USE_MINRATE;
579
	}
580 581 582 583

	return TX_CONTINUE;
}

584
static ieee80211_tx_result debug_noinline
585
ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
586
{
587
	struct ieee80211_key *key;
588
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
589
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
590

J
Johannes Berg 已提交
591
	if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT))
592
		tx->key = NULL;
593 594
	else if (tx->sta &&
		 (key = rcu_dereference(tx->sta->ptk[tx->sta->ptk_idx])))
595
		tx->key = key;
596
	else if (ieee80211_is_mgmt(hdr->frame_control) &&
597
		 is_multicast_ether_addr(hdr->addr1) &&
598
		 ieee80211_is_robust_mgmt_frame(tx->skb) &&
599 600
		 (key = rcu_dereference(tx->sdata->default_mgmt_key)))
		tx->key = key;
601 602 603 604 605
	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)))
606
		tx->key = key;
607
	else
608
		tx->key = NULL;
609 610

	if (tx->key) {
611 612
		bool skip_hw = false;

613
		tx->key->tx_rx_count++;
614
		/* TODO: add threshold stuff again */
615

616 617 618 619
		switch (tx->key->conf.cipher) {
		case WLAN_CIPHER_SUITE_WEP40:
		case WLAN_CIPHER_SUITE_WEP104:
		case WLAN_CIPHER_SUITE_TKIP:
620
			if (!ieee80211_is_data_present(hdr->frame_control))
621 622
				tx->key = NULL;
			break;
623
		case WLAN_CIPHER_SUITE_CCMP:
J
Jouni Malinen 已提交
624
		case WLAN_CIPHER_SUITE_CCMP_256:
625 626
		case WLAN_CIPHER_SUITE_GCMP:
		case WLAN_CIPHER_SUITE_GCMP_256:
627 628 629 630
			if (!ieee80211_is_data_present(hdr->frame_control) &&
			    !ieee80211_use_mfp(hdr->frame_control, tx->sta,
					       tx->skb))
				tx->key = NULL;
631 632
			else
				skip_hw = (tx->key->conf.flags &
633
					   IEEE80211_KEY_FLAG_SW_MGMT_TX) &&
634
					ieee80211_is_mgmt(hdr->frame_control);
635
			break;
636
		case WLAN_CIPHER_SUITE_AES_CMAC:
637
		case WLAN_CIPHER_SUITE_BIP_CMAC_256:
638 639
		case WLAN_CIPHER_SUITE_BIP_GMAC_128:
		case WLAN_CIPHER_SUITE_BIP_GMAC_256:
640 641 642
			if (!ieee80211_is_mgmt(hdr->frame_control))
				tx->key = NULL;
			break;
643
		}
644

645 646
		if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED &&
			     !ieee80211_is_deauth(hdr->frame_control)))
647 648
			return TX_DROP;

J
Johannes Berg 已提交
649
		if (!skip_hw && tx->key &&
J
Johannes Berg 已提交
650
		    tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
651
			info->control.hw_key = &tx->key->conf;
652 653
	}

654
	return TX_CONTINUE;
655 656
}

657
static ieee80211_tx_result debug_noinline
658
ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
659
{
660
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
661 662
	struct ieee80211_hdr *hdr = (void *)tx->skb->data;
	struct ieee80211_supported_band *sband;
S
Shanyu Zhao 已提交
663
	u32 len;
664
	struct ieee80211_tx_rate_control txrc;
665
	struct ieee80211_sta_rates *ratetbl = NULL;
J
Johannes Berg 已提交
666
	bool assoc = false;
667

668
	memset(&txrc, 0, sizeof(txrc));
669

670
	sband = tx->local->hw.wiphy->bands[info->band];
671

S
Shanyu Zhao 已提交
672
	len = min_t(u32, tx->skb->len + FCS_LEN,
673
			 tx->local->hw.wiphy->frag_threshold);
674 675

	/* set up the tx rate control struct we give the RC algo */
J
Johannes Berg 已提交
676
	txrc.hw = &tx->local->hw;
677 678 679 680
	txrc.sband = sband;
	txrc.bss_conf = &tx->sdata->vif.bss_conf;
	txrc.skb = tx->skb;
	txrc.reported_rate.idx = -1;
681
	txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band];
682 683 684 685
	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;
686 687 688 689 690

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

691
	txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
692
		    tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT ||
693
		    tx->sdata->vif.type == NL80211_IFTYPE_ADHOC);
694 695

	/* set up RTS protection if desired */
696
	if (len > tx->local->hw.wiphy->rts_threshold) {
697
		txrc.rts = true;
698 699
	}

700
	info->control.use_rts = txrc.rts;
701 702
	info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot;

703 704 705 706 707 708 709 710
	/*
	 * 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
711
	     (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE))))
712 713 714
		txrc.short_preamble = true;

	info->control.short_preamble = txrc.short_preamble;
715

J
Johannes Berg 已提交
716 717
	if (tx->sta)
		assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
718 719 720 721 722

	/*
	 * 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
723
	if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc &&
724 725 726 727
		 !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",
728
		 tx->sdata->name, hdr->addr1,
729
		 info->band ? 5 : 2))
730
		return TX_DROP;
731

732 733 734 735
	/*
	 * If we're associated with the sta at this point we know we can at
	 * least send the frame at the lowest bit rate.
	 */
736 737
	rate_control_get_rate(tx->sdata, tx->sta, &txrc);

738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758
	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];
	}
759

760
	if (txrc.reported_rate.idx < 0) {
761
		txrc.reported_rate = tx->rate;
762 763 764
		if (tx->sta && ieee80211_is_data(hdr->frame_control))
			tx->sta->last_tx_rate = txrc.reported_rate;
	} else if (tx->sta)
765
		tx->sta->last_tx_rate = txrc.reported_rate;
766

767 768 769
	if (ratetbl)
		return TX_CONTINUE;

770 771
	if (unlikely(!info->control.rates[0].count))
		info->control.rates[0].count = 1;
772

773 774 775 776
	if (WARN_ON_ONCE((info->control.rates[0].count > 1) &&
			 (info->flags & IEEE80211_TX_CTL_NO_ACK)))
		info->control.rates[0].count = 1;

777 778 779
	return TX_CONTINUE;
}

780 781 782 783 784 785 786 787 788 789 790
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;
}

791 792 793 794 795 796 797 798
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;

799 800 801 802 803
	/*
	 * 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.
	 */
804
	if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR))
805 806
		return TX_CONTINUE;

807 808 809 810 811 812
	if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
		return TX_CONTINUE;

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

813 814 815
	if (ieee80211_is_qos_nullfunc(hdr->frame_control))
		return TX_CONTINUE;

J
Johannes Berg 已提交
816 817 818
	/*
	 * Anything but QoS data that has a sequence number field
	 * (is long enough) gets a sequence number from the global
819 820
	 * 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
821
	 */
822 823
	if (!ieee80211_is_data_qos(hdr->frame_control) ||
	    is_multicast_ether_addr(hdr->addr1)) {
J
Johannes Berg 已提交
824
		/* driver should assign sequence number */
825
		info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
J
Johannes Berg 已提交
826 827 828
		/* 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;
829 830
		if (tx->sta)
			tx->sta->tx_msdu[IEEE80211_NUM_TIDS]++;
831 832 833 834 835 836 837 838 839 840 841 842 843 844 845
		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;
846
	tx->sta->tx_msdu[tid]++;
847

848 849
	if (!tx->sta->sta.txq[0])
		hdr->seq_ctrl = ieee80211_tx_next_seq(tx->sta, tid);
850 851 852 853

	return TX_CONTINUE;
}

854
static int ieee80211_fragment(struct ieee80211_tx_data *tx,
J
Johannes Berg 已提交
855 856 857
			      struct sk_buff *skb, int hdrlen,
			      int frag_threshold)
{
858
	struct ieee80211_local *local = tx->local;
859
	struct ieee80211_tx_info *info;
860
	struct sk_buff *tmp;
J
Johannes Berg 已提交
861 862 863 864 865 866 867
	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;

868 869
	/* first fragment was already added to queue by caller */

J
Johannes Berg 已提交
870 871 872 873 874 875 876 877
	while (rem) {
		int fraglen = per_fragm;

		if (fraglen > rem)
			fraglen = rem;
		rem -= fraglen;
		tmp = dev_alloc_skb(local->tx_headroom +
				    frag_threshold +
878
				    tx->sdata->encrypt_headroom +
J
Johannes Berg 已提交
879 880 881
				    IEEE80211_ENCRYPT_TAILROOM);
		if (!tmp)
			return -ENOMEM;
882 883 884

		__skb_queue_tail(&tx->skbs, tmp);

885 886 887
		skb_reserve(tmp,
			    local->tx_headroom + tx->sdata->encrypt_headroom);

J
Johannes Berg 已提交
888 889
		/* copy control information */
		memcpy(tmp->cb, skb->cb, sizeof(tmp->cb));
890 891 892 893 894 895 896 897

		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
898 899 900 901 902 903 904 905 906 907 908
		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;
	}

909
	/* adjust first fragment's length */
910
	skb_trim(skb, hdrlen + per_fragm);
J
Johannes Berg 已提交
911 912 913
	return 0;
}

914
static ieee80211_tx_result debug_noinline
915 916
ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
{
J
Johannes Berg 已提交
917 918 919
	struct sk_buff *skb = tx->skb;
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
	struct ieee80211_hdr *hdr = (void *)skb->data;
920
	int frag_threshold = tx->local->hw.wiphy->frag_threshold;
J
Johannes Berg 已提交
921 922
	int hdrlen;
	int fragnum;
923

924 925 926 927
	/* no matter what happens, tx->skb moves to tx->skbs */
	__skb_queue_tail(&tx->skbs, skb);
	tx->skb = NULL;

928 929 930 931
	if (info->flags & IEEE80211_TX_CTL_DONTFRAG)
		return TX_CONTINUE;

	if (tx->local->ops->set_frag_threshold)
932 933
		return TX_CONTINUE;

934 935
	/*
	 * Warn when submitting a fragmented A-MPDU frame and drop it.
J
Johannes Berg 已提交
936
	 * This scenario is handled in ieee80211_tx_prepare but extra
937
	 * caution taken here as fragmented ampdu may cause Tx stop.
938
	 */
S
Sujith 已提交
939
	if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
940 941
		return TX_DROP;

942
	hdrlen = ieee80211_hdrlen(hdr->frame_control);
943

944
	/* internal error, why isn't DONTFRAG set? */
945
	if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))
J
Johannes Berg 已提交
946
		return TX_DROP;
947

J
Johannes Berg 已提交
948 949 950 951 952 953 954 955
	/*
	 * 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.
	 */
956
	if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold))
J
Johannes Berg 已提交
957
		return TX_DROP;
958

J
Johannes Berg 已提交
959 960
	/* update duration/seq/flags of fragments */
	fragnum = 0;
961 962

	skb_queue_walk(&tx->skbs, skb) {
J
Johannes Berg 已提交
963
		const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
964

J
Johannes Berg 已提交
965 966
		hdr = (void *)skb->data;
		info = IEEE80211_SKB_CB(skb);
967

968
		if (!skb_queue_is_last(&tx->skbs, skb)) {
J
Johannes Berg 已提交
969
			hdr->frame_control |= morefrags;
970 971 972 973 974 975 976
			/*
			 * 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;
977
			BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4);
978
			info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
J
Johannes Berg 已提交
979 980
		} else {
			hdr->frame_control &= ~morefrags;
981
		}
J
Johannes Berg 已提交
982 983
		hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG);
		fragnum++;
984
	}
985

986
	return TX_CONTINUE;
987 988
}

989 990 991
static ieee80211_tx_result debug_noinline
ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
{
992
	struct sk_buff *skb;
993
	int ac = -1;
994 995 996 997

	if (!tx->sta)
		return TX_CONTINUE;

998
	skb_queue_walk(&tx->skbs, skb) {
999 1000
		ac = skb_get_queue_mapping(skb);
		tx->sta->tx_bytes[ac] += skb->len;
1001
	}
1002 1003
	if (ac >= 0)
		tx->sta->tx_packets[ac]++;
1004 1005 1006 1007

	return TX_CONTINUE;
}

1008
static ieee80211_tx_result debug_noinline
1009 1010 1011 1012 1013
ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
{
	if (!tx->key)
		return TX_CONTINUE;

1014 1015 1016
	switch (tx->key->conf.cipher) {
	case WLAN_CIPHER_SUITE_WEP40:
	case WLAN_CIPHER_SUITE_WEP104:
1017
		return ieee80211_crypto_wep_encrypt(tx);
1018
	case WLAN_CIPHER_SUITE_TKIP:
1019
		return ieee80211_crypto_tkip_encrypt(tx);
1020
	case WLAN_CIPHER_SUITE_CCMP:
J
Jouni Malinen 已提交
1021 1022 1023 1024 1025
		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);
1026
	case WLAN_CIPHER_SUITE_AES_CMAC:
1027
		return ieee80211_crypto_aes_cmac_encrypt(tx);
1028 1029
	case WLAN_CIPHER_SUITE_BIP_CMAC_256:
		return ieee80211_crypto_aes_cmac_256_encrypt(tx);
1030 1031 1032
	case WLAN_CIPHER_SUITE_BIP_GMAC_128:
	case WLAN_CIPHER_SUITE_BIP_GMAC_256:
		return ieee80211_crypto_aes_gmac_encrypt(tx);
1033 1034 1035
	case WLAN_CIPHER_SUITE_GCMP:
	case WLAN_CIPHER_SUITE_GCMP_256:
		return ieee80211_crypto_gcmp_encrypt(tx);
1036
	default:
1037
		return ieee80211_crypto_hw_encrypt(tx);
1038 1039 1040 1041 1042
	}

	return TX_DROP;
}

1043
static ieee80211_tx_result debug_noinline
J
Johannes Berg 已提交
1044 1045
ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
{
1046
	struct sk_buff *skb;
J
Johannes Berg 已提交
1047 1048 1049
	struct ieee80211_hdr *hdr;
	int next_len;
	bool group_addr;
J
Johannes Berg 已提交
1050

1051
	skb_queue_walk(&tx->skbs, skb) {
J
Johannes Berg 已提交
1052
		hdr = (void *) skb->data;
1053 1054
		if (unlikely(ieee80211_is_pspoll(hdr->frame_control)))
			break; /* must not overwrite AID */
1055 1056 1057 1058 1059
		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
1060
		group_addr = is_multicast_ether_addr(hdr->addr1);
J
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1061

J
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1062
		hdr->duration_id =
1063 1064
			ieee80211_duration(tx, skb, group_addr, next_len);
	}
J
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1065 1066 1067 1068

	return TX_CONTINUE;
}

1069 1070
/* actual transmit path */

1071 1072 1073 1074 1075 1076 1077
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;
1078
	bool reset_agg_timer = false;
1079
	struct sk_buff *purge_skb = NULL;
1080 1081 1082

	if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
		info->flags |= IEEE80211_TX_CTL_AMPDU;
1083
		reset_agg_timer = true;
1084 1085 1086 1087 1088
	} 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
		 */
1089
	} else if (!tx->sta->sta.txq[tid]) {
1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108
		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
1109
		tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid);
1110 1111 1112 1113 1114

		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;
1115
			reset_agg_timer = true;
1116 1117 1118 1119
		} else {
			queued = true;
			info->control.vif = &tx->sdata->vif;
			info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1120
			info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
1121
			__skb_queue_tail(&tid_tx->pending, skb);
1122 1123
			if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER)
				purge_skb = __skb_dequeue(&tid_tx->pending);
1124 1125
		}
		spin_unlock(&tx->sta->lock);
1126 1127

		if (purge_skb)
1128
			ieee80211_free_txskb(&tx->local->hw, purge_skb);
1129 1130
	}

1131 1132
	/* reset session timer */
	if (reset_agg_timer && tid_tx->timeout)
1133
		tid_tx->last_tx = jiffies;
1134

1135 1136 1137
	return queued;
}

1138 1139
/*
 * initialises @tx
1140 1141
 * pass %NULL for the station if unknown, a valid pointer if known
 * or an ERR_PTR() if the station is known not to exist
1142
 */
1143
static ieee80211_tx_result
J
Johannes Berg 已提交
1144 1145
ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
		     struct ieee80211_tx_data *tx,
1146
		     struct sta_info *sta, struct sk_buff *skb)
1147
{
J
Johannes Berg 已提交
1148
	struct ieee80211_local *local = sdata->local;
1149
	struct ieee80211_hdr *hdr;
1150
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
J
Johannes Berg 已提交
1151
	int tid;
1152
	u8 *qc;
1153 1154 1155 1156

	memset(tx, 0, sizeof(*tx));
	tx->skb = skb;
	tx->local = local;
J
Johannes Berg 已提交
1157
	tx->sdata = sdata;
1158
	__skb_queue_head_init(&tx->skbs);
1159

1160 1161 1162 1163 1164 1165 1166
	/*
	 * 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;

1167 1168
	hdr = (struct ieee80211_hdr *) skb->data;

1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183
	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);
1184
	}
1185

1186
	if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) &&
1187
	    !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
1188 1189
	    (local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION) &&
	    !(local->hw.flags & IEEE80211_HW_TX_AMPDU_SETUP_IN_HW)) {
1190 1191
		struct tid_ampdu_tx *tid_tx;

S
Sujith 已提交
1192 1193 1194
		qc = ieee80211_get_qos_ctl(hdr);
		tid = *qc & IEEE80211_QOS_CTL_TID_MASK;

1195 1196 1197
		tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
		if (tid_tx) {
			bool queued;
1198

1199 1200 1201 1202 1203 1204
			queued = ieee80211_tx_prep_agg(tx, skb, info,
						       tid_tx, tid);

			if (unlikely(queued))
				return TX_QUEUED;
		}
S
Sujith 已提交
1205 1206
	}

1207
	if (is_multicast_ether_addr(hdr->addr1)) {
1208
		tx->flags &= ~IEEE80211_TX_UNICAST;
1209
		info->flags |= IEEE80211_TX_CTL_NO_ACK;
1210
	} else
1211
		tx->flags |= IEEE80211_TX_UNICAST;
1212

1213 1214 1215 1216 1217
	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;
1218 1219
	}

1220
	if (!tx->sta)
1221
		info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
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Johannes Berg 已提交
1222
	else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT))
1223
		info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1224

1225
	info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
1226

1227
	return TX_CONTINUE;
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 1318 1319
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);

1320 1321 1322 1323 1324
static bool ieee80211_tx_frags(struct ieee80211_local *local,
			       struct ieee80211_vif *vif,
			       struct ieee80211_sta *sta,
			       struct sk_buff_head *skbs,
			       bool txpending)
1325
{
1326
	struct sk_buff *skb, *tmp;
J
Johannes Berg 已提交
1327
	unsigned long flags;
1328

1329
	skb_queue_walk_safe(skbs, skb, tmp) {
1330 1331 1332 1333 1334 1335
		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);
1336
			ieee80211_free_txskb(&local->hw, skb);
1337 1338 1339
			continue;
		}
#endif
J
Johannes Berg 已提交
1340 1341 1342

		spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
		if (local->queue_stop_reasons[q] ||
1343
		    (!txpending && !skb_queue_empty(&local->pending[q]))) {
1344
			if (unlikely(info->flags &
1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362
				     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 {

1363
				/*
1364 1365 1366
				 * Since queue is stopped, queue up frames for
				 * later transmission from the tx-pending
				 * tasklet when the queue is woken again.
1367
				 */
1368 1369 1370 1371 1372 1373 1374 1375 1376 1377
				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;
1378
			}
1379
		}
J
Johannes Berg 已提交
1380
		spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1381

1382
		info->control.vif = vif;
1383

1384
		__skb_unlink(skb, skbs);
1385
		ieee80211_drv_tx(local, vif, sta, skb);
1386
	}
1387

1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404
	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;
1405

1406 1407
	if (WARN_ON(skb_queue_empty(skbs)))
		return true;
J
Johannes Berg 已提交
1408

1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422
	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:
1423 1424 1425 1426
		if (sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE) {
			vif = &sdata->vif;
			break;
		}
1427
		sdata = rcu_dereference(local->monitor_sdata);
1428
		if (sdata) {
1429
			vif = &sdata->vif;
1430 1431 1432 1433 1434 1435
			info->hw_queue =
				vif->hw_queue[skb_get_queue_mapping(skb)];
		} else if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL) {
			dev_kfree_skb(skb);
			return true;
		} else
1436
			vif = NULL;
1437 1438 1439 1440 1441 1442 1443 1444
		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;
1445
	}
J
Johannes Berg 已提交
1446

1447 1448
	result = ieee80211_tx_frags(local, vif, pubsta, skbs,
				    txpending);
1449

1450 1451
	ieee80211_tpt_led_trig_tx(local, fc, led_len);

J
Johannes Berg 已提交
1452
	WARN_ON_ONCE(!skb_queue_empty(skbs));
1453

1454
	return result;
1455 1456
}

1457 1458 1459 1460 1461 1462
/*
 * 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)
{
1463
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
1464 1465
	ieee80211_tx_result res = TX_DROP;

1466 1467 1468 1469 1470 1471 1472
#define CALL_TXH(txh) \
	do {				\
		res = txh(tx);		\
		if (res != TX_CONTINUE)	\
			goto txh_done;	\
	} while (0)

1473
	CALL_TXH(ieee80211_tx_h_dynamic_ps);
1474 1475
	CALL_TXH(ieee80211_tx_h_check_assoc);
	CALL_TXH(ieee80211_tx_h_ps_buf);
1476
	CALL_TXH(ieee80211_tx_h_check_control_port_protocol);
1477
	CALL_TXH(ieee80211_tx_h_select_key);
1478 1479
	if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
		CALL_TXH(ieee80211_tx_h_rate_ctrl);
1480

J
Johannes Berg 已提交
1481 1482 1483
	if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) {
		__skb_queue_tail(&tx->skbs, tx->skb);
		tx->skb = NULL;
1484
		goto txh_done;
J
Johannes Berg 已提交
1485
	}
1486 1487

	CALL_TXH(ieee80211_tx_h_michael_mic_add);
1488 1489
	CALL_TXH(ieee80211_tx_h_sequence);
	CALL_TXH(ieee80211_tx_h_fragment);
1490
	/* handlers after fragment must be aware of tx info fragmentation! */
1491 1492
	CALL_TXH(ieee80211_tx_h_stats);
	CALL_TXH(ieee80211_tx_h_encrypt);
1493 1494
	if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
		CALL_TXH(ieee80211_tx_h_calculate_duration);
1495
#undef CALL_TXH
1496

1497
 txh_done:
1498
	if (unlikely(res == TX_DROP)) {
1499
		I802_DEBUG_INC(tx->local->tx_handlers_drop);
1500
		if (tx->skb)
1501
			ieee80211_free_txskb(&tx->local->hw, tx->skb);
1502
		else
1503
			ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs);
1504 1505
		return -1;
	} else if (unlikely(res == TX_QUEUED)) {
1506
		I802_DEBUG_INC(tx->local->tx_handlers_queued);
1507 1508 1509 1510 1511 1512
		return -1;
	}

	return 0;
}

1513 1514 1515 1516 1517 1518 1519
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;
1520
	struct sk_buff *skb2;
1521

1522
	if (ieee80211_tx_prepare(sdata, &tx, NULL, skb) == TX_DROP)
1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538
		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;
	}

1539 1540 1541 1542 1543 1544 1545 1546
	/* 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;
	}

1547 1548 1549 1550
	return true;
}
EXPORT_SYMBOL(ieee80211_tx_prepare_skb);

1551 1552 1553 1554
/*
 * Returns false if the frame couldn't be transmitted but was queued instead.
 */
static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata,
1555 1556
			 struct sta_info *sta, struct sk_buff *skb,
			 bool txpending)
1557
{
J
Johannes Berg 已提交
1558
	struct ieee80211_local *local = sdata->local;
1559
	struct ieee80211_tx_data tx;
1560
	ieee80211_tx_result res_prepare;
1561
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1562
	bool result = true;
1563
	int led_len;
1564 1565 1566

	if (unlikely(skb->len < 10)) {
		dev_kfree_skb(skb);
1567
		return true;
1568 1569
	}

1570
	/* initialises tx */
1571
	led_len = skb->len;
1572
	res_prepare = ieee80211_tx_prepare(sdata, &tx, sta, skb);
1573

1574
	if (unlikely(res_prepare == TX_DROP)) {
1575
		ieee80211_free_txskb(&local->hw, skb);
J
Johannes Berg 已提交
1576
		return true;
1577
	} else if (unlikely(res_prepare == TX_QUEUED)) {
J
Johannes Berg 已提交
1578
		return true;
1579 1580
	}

1581 1582 1583 1584 1585 1586
	/* set up hw_queue value early */
	if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) ||
	    !(local->hw.flags & IEEE80211_HW_QUEUE_CONTROL))
		info->hw_queue =
			sdata->vif.hw_queue[skb_get_queue_mapping(skb)];

1587
	if (!invoke_tx_handlers(&tx))
1588 1589
		result = __ieee80211_tx(local, &tx.skbs, led_len,
					tx.sta, txpending);
J
Johannes Berg 已提交
1590

1591
	return result;
1592 1593 1594 1595
}

/* device xmit handlers */

1596
static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata,
1597 1598 1599
				struct sk_buff *skb,
				int head_need, bool may_encrypt)
{
1600
	struct ieee80211_local *local = sdata->local;
1601 1602
	int tail_need = 0;

1603
	if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) {
1604 1605 1606 1607 1608
		tail_need = IEEE80211_ENCRYPT_TAILROOM;
		tail_need -= skb_tailroom(skb);
		tail_need = max_t(int, tail_need, 0);
	}

1609 1610 1611
	if (skb_cloned(skb) &&
	    (!(local->hw.flags & IEEE80211_HW_SUPPORTS_CLONED_SKBS) ||
	     !skb_clone_writable(skb, ETH_HLEN) ||
J
Johannes Berg 已提交
1612
	     (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt)))
1613
		I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1614
	else if (head_need || tail_need)
1615
		I802_DEBUG_INC(local->tx_expand_skb_head);
1616 1617
	else
		return 0;
1618 1619

	if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
J
Joe Perches 已提交
1620 1621
		wiphy_debug(local->hw.wiphy,
			    "failed to reallocate TX buffer\n");
1622 1623 1624 1625 1626 1627
		return -ENOMEM;
	}

	return 0;
}

1628 1629
void ieee80211_xmit(struct ieee80211_sub_if_data *sdata,
		    struct sta_info *sta, struct sk_buff *skb)
1630
{
J
Johannes Berg 已提交
1631
	struct ieee80211_local *local = sdata->local;
1632
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1633
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1634
	int headroom;
1635
	bool may_encrypt;
1636

J
Johannes Berg 已提交
1637
	may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT);
1638

J
Johannes Berg 已提交
1639
	headroom = local->tx_headroom;
1640
	if (may_encrypt)
1641
		headroom += sdata->encrypt_headroom;
1642 1643 1644
	headroom -= skb_headroom(skb);
	headroom = max_t(int, 0, headroom);

1645
	if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) {
1646
		ieee80211_free_txskb(&local->hw, skb);
J
Johannes Berg 已提交
1647
		return;
1648 1649
	}

1650
	hdr = (struct ieee80211_hdr *) skb->data;
1651
	info->control.vif = &sdata->vif;
1652

M
Marco Porsch 已提交
1653 1654 1655
	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
1656
			if (mesh_nexthop_resolve(sdata, skb))
M
Marco Porsch 已提交
1657 1658 1659 1660
				return; /* skb queued: don't free */
		} else {
			ieee80211_mps_set_frame_flags(sdata, NULL, hdr);
		}
1661
	}
1662

1663
	ieee80211_set_qos_hdr(sdata, skb);
1664
	ieee80211_tx(sdata, sta, skb, false);
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 1748 1749
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;
}

1750 1751
netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
					 struct net_device *dev)
1752 1753
{
	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
J
Johannes Berg 已提交
1754
	struct ieee80211_chanctx_conf *chanctx_conf;
1755 1756
	struct ieee80211_radiotap_header *prthdr =
		(struct ieee80211_radiotap_header *)skb->data;
J
Johannes Berg 已提交
1757
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1758
	struct ieee80211_hdr *hdr;
J
Johannes Berg 已提交
1759
	struct ieee80211_sub_if_data *tmp_sdata, *sdata;
1760
	struct cfg80211_chan_def *chandef;
1761
	u16 len_rthdr;
J
Johannes Berg 已提交
1762
	int hdrlen;
1763

1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777
	/* 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 */
1778 1779 1780 1781 1782 1783 1784

	/*
	 * 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
	 */
1785
	skb_set_mac_header(skb, len_rthdr);
1786
	/*
1787 1788
	 * 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
1789
	 */
1790 1791
	skb_set_network_header(skb, len_rthdr);
	skb_set_transport_header(skb, len_rthdr);
1792

J
Johannes Berg 已提交
1793 1794 1795 1796 1797 1798 1799 1800 1801
	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;

1802 1803 1804 1805
	/*
	 * Initialize skb->protocol if the injected frame is a data frame
	 * carrying a rfc1042 header
	 */
J
Johannes Berg 已提交
1806 1807 1808 1809
	if (ieee80211_is_data(hdr->frame_control) &&
	    skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) {
		u8 *payload = (u8 *)hdr + hdrlen;

1810
		if (ether_addr_equal(payload, rfc1042_header))
J
Johannes Berg 已提交
1811 1812
			skb->protocol = cpu_to_be16((payload[6] << 8) |
						    payload[7]);
1813 1814
	}

J
Johannes Berg 已提交
1815 1816
	memset(info, 0, sizeof(*info));

J
Johannes Berg 已提交
1817
	info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
1818 1819 1820 1821 1822
		      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
1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842

	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;
1843
		if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) {
J
Johannes Berg 已提交
1844 1845 1846 1847
			sdata = tmp_sdata;
			break;
		}
	}
1848

J
Johannes Berg 已提交
1849 1850 1851 1852 1853 1854 1855 1856
	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);
	}

1857
	if (chanctx_conf)
1858
		chandef = &chanctx_conf->def;
1859
	else if (!local->use_chanctx)
1860
		chandef = &local->_oper_chandef;
1861 1862
	else
		goto fail_rcu;
J
Johannes Berg 已提交
1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879

	/*
	 * 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.
	 */
1880 1881
	if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef,
				     sdata->vif.type))
J
Johannes Berg 已提交
1882 1883
		goto fail_rcu;

1884
	info->band = chandef->chan->band;
1885
	ieee80211_xmit(sdata, NULL, skb);
J
Johannes Berg 已提交
1886 1887
	rcu_read_unlock();

1888
	return NETDEV_TX_OK;
1889

J
Johannes Berg 已提交
1890 1891
fail_rcu:
	rcu_read_unlock();
1892 1893 1894
fail:
	dev_kfree_skb(skb);
	return NETDEV_TX_OK; /* meaning, we dealt with the skb */
1895 1896
}

1897
static inline bool ieee80211_is_tdls_setup(struct sk_buff *skb)
1898
{
1899
	u16 ethertype = (skb->data[12] << 8) | skb->data[13];
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 1978 1979
	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;
1980 1981
}

1982
/**
1983 1984 1985
 * 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
1986
 * @info_flags: skb flags to set
1987
 *
1988 1989 1990 1991 1992 1993 1994
 * 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.
1995
 *
1996 1997 1998
 * The function requires the read-side RCU lock held
 *
 * Returns: the (possibly reallocated) skb or an ERR_PTR() code
1999
 */
2000
static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata,
2001
					   struct sk_buff *skb, u32 info_flags,
2002
					   struct sta_info *sta)
2003
{
2004
	struct ieee80211_local *local = sdata->local;
2005
	struct ieee80211_tx_info *info;
2006
	int head_need;
2007 2008
	u16 ethertype, hdrlen,  meshhdrlen = 0;
	__le16 fc;
2009
	struct ieee80211_hdr hdr;
2010
	struct ieee80211s_hdr mesh_hdr __maybe_unused;
2011
	struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL;
2012 2013
	const u8 *encaps_data;
	int encaps_len, skip_header_bytes;
2014
	int nh_pos, h_pos;
2015 2016
	bool wme_sta = false, authorized = false;
	bool tdls_peer;
J
Johannes Berg 已提交
2017 2018
	bool multicast;
	u16 info_id = 0;
J
Johannes Berg 已提交
2019 2020 2021
	struct ieee80211_chanctx_conf *chanctx_conf;
	struct ieee80211_sub_if_data *ap_sdata;
	enum ieee80211_band band;
2022
	int ret;
2023

2024 2025 2026
	if (IS_ERR(sta))
		sta = NULL;

2027 2028 2029
	/* convert Ethernet header to proper 802.11 header (based on
	 * operation mode) */
	ethertype = (skb->data[12] << 8) | skb->data[13];
2030
	fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
2031

2032
	switch (sdata->vif.type) {
2033
	case NL80211_IFTYPE_AP_VLAN:
2034
		if (sdata->wdev.use_4addr) {
2035 2036 2037
			fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
			/* RA TA DA SA */
			memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN);
2038
			memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2039 2040 2041
			memcpy(hdr.addr3, skb->data, ETH_ALEN);
			memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
			hdrlen = 30;
J
Johannes Berg 已提交
2042
			authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
2043
			wme_sta = sta->sta.wme;
2044
		}
J
Johannes Berg 已提交
2045 2046 2047
		ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
					u.ap);
		chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf);
2048 2049 2050 2051
		if (!chanctx_conf) {
			ret = -ENOTCONN;
			goto free;
		}
2052
		band = chanctx_conf->def.chan->band;
2053
		if (sdata->wdev.use_4addr)
2054 2055 2056
			break;
		/* fall through */
	case NL80211_IFTYPE_AP:
A
Arnd Bergmann 已提交
2057 2058
		if (sdata->vif.type == NL80211_IFTYPE_AP)
			chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2059 2060 2061 2062
		if (!chanctx_conf) {
			ret = -ENOTCONN;
			goto free;
		}
2063
		fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
2064 2065
		/* DA BSSID SA */
		memcpy(hdr.addr1, skb->data, ETH_ALEN);
2066
		memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2067 2068
		memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
		hdrlen = 24;
2069
		band = chanctx_conf->def.chan->band;
2070
		break;
2071
	case NL80211_IFTYPE_WDS:
2072
		fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
2073 2074
		/* RA TA DA SA */
		memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
2075
		memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2076 2077 2078
		memcpy(hdr.addr3, skb->data, ETH_ALEN);
		memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
		hdrlen = 30;
J
Johannes Berg 已提交
2079 2080 2081 2082
		/*
		 * This is the exception! WDS style interfaces are prohibited
		 * when channel contexts are in used so this must be valid
		 */
2083
		band = local->hw.conf.chandef.chan->band;
2084
		break;
2085
#ifdef CONFIG_MAC80211_MESH
2086
	case NL80211_IFTYPE_MESH_POINT:
2087
		if (!is_multicast_ether_addr(skb->data)) {
2088 2089 2090
			struct sta_info *next_hop;
			bool mpp_lookup = true;

J
Johannes Berg 已提交
2091
			mpath = mesh_path_lookup(sdata, skb->data);
2092 2093 2094 2095 2096 2097 2098 2099 2100 2101
			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
2102
				mppath = mpp_path_lookup(sdata, skb->data);
2103 2104 2105

			if (mppath && mpath)
				mesh_path_del(mpath->sdata, mpath->dst);
2106
		}
2107

2108
		/*
2109 2110 2111 2112
		 * 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)
2113
		 */
2114 2115
		if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) &&
		    !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) {
2116 2117
			hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
					skb->data, skb->data + ETH_ALEN);
J
Johannes Berg 已提交
2118 2119
			meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr,
							       NULL, NULL);
2120
		} else {
2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132
			/* 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;
2133

2134
			hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
2135
					mesh_da, sdata->vif.addr);
2136 2137
			if (is_multicast_ether_addr(mesh_da))
				/* DA TA mSA AE:SA */
J
Johannes Berg 已提交
2138 2139 2140
				meshhdrlen = ieee80211_new_mesh_header(
						sdata, &mesh_hdr,
						skb->data + ETH_ALEN, NULL);
2141
			else
2142
				/* RA TA mDA mSA AE:DA SA */
J
Johannes Berg 已提交
2143 2144 2145
				meshhdrlen = ieee80211_new_mesh_header(
						sdata, &mesh_hdr, skb->data,
						skb->data + ETH_ALEN);
2146 2147

		}
J
Johannes Berg 已提交
2148
		chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2149 2150 2151 2152
		if (!chanctx_conf) {
			ret = -ENOTCONN;
			goto free;
		}
2153
		band = chanctx_conf->def.chan->band;
2154 2155
		break;
#endif
2156
	case NL80211_IFTYPE_STATION:
2157 2158
		/* we already did checks when looking up the RA STA */
		tdls_peer = test_sta_flag(sta, WLAN_STA_TDLS_PEER);
2159

2160
		if (tdls_peer) {
2161 2162 2163 2164 2165 2166 2167 2168 2169
			/* 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);
2170
			/* RA TA DA SA */
2171
			memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
2172
			memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2173 2174 2175 2176 2177 2178
			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 */
2179
			memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
2180 2181 2182 2183
			memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
			memcpy(hdr.addr3, skb->data, ETH_ALEN);
			hdrlen = 24;
		}
J
Johannes Berg 已提交
2184
		chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2185 2186 2187 2188
		if (!chanctx_conf) {
			ret = -ENOTCONN;
			goto free;
		}
2189
		band = chanctx_conf->def.chan->band;
2190
		break;
2191 2192 2193 2194 2195 2196 2197
	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);
2198 2199 2200 2201
		if (!chanctx_conf) {
			ret = -ENOTCONN;
			goto free;
		}
2202 2203
		band = chanctx_conf->def.chan->band;
		break;
2204
	case NL80211_IFTYPE_ADHOC:
2205 2206 2207
		/* DA SA BSSID */
		memcpy(hdr.addr1, skb->data, ETH_ALEN);
		memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2208
		memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN);
2209
		hdrlen = 24;
J
Johannes Berg 已提交
2210
		chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2211 2212 2213 2214
		if (!chanctx_conf) {
			ret = -ENOTCONN;
			goto free;
		}
2215
		band = chanctx_conf->def.chan->band;
2216 2217
		break;
	default:
2218 2219
		ret = -EINVAL;
		goto free;
2220 2221
	}

J
Johannes Berg 已提交
2222
	multicast = is_multicast_ether_addr(hdr.addr1);
2223

2224 2225 2226 2227 2228 2229
	/* 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
2230
		wme_sta = true;
2231
	}
2232

2233 2234
	/* receiver does QoS (which also means we do) use it */
	if (wme_sta) {
2235
		fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
2236 2237 2238 2239
		hdrlen += 2;
	}

	/*
2240 2241
	 * Drop unicast frames to unauthorised stations unless they are
	 * EAPOL frames from the local station.
2242
	 */
2243
	if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) &&
2244
		     (sdata->vif.type != NL80211_IFTYPE_OCB) &&
2245
		     !multicast && !authorized &&
2246
		     (cpu_to_be16(ethertype) != sdata->control_port_protocol ||
2247
		      !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) {
2248
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
J
Johannes Berg 已提交
2249
		net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n",
2250
				    sdata->name, hdr.addr1);
2251 2252 2253 2254
#endif

		I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);

2255 2256
		ret = -EPERM;
		goto free;
2257 2258
	}

J
Johannes Berg 已提交
2259 2260
	if (unlikely(!multicast && skb->sk &&
		     skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) {
2261
		struct sk_buff *ack_skb = skb_clone_sk(skb);
J
Johannes Berg 已提交
2262

2263
		if (ack_skb) {
J
Johannes Berg 已提交
2264
			unsigned long flags;
T
Tejun Heo 已提交
2265
			int id;
J
Johannes Berg 已提交
2266 2267

			spin_lock_irqsave(&local->ack_status_lock, flags);
2268
			id = idr_alloc(&local->ack_status_frames, ack_skb,
T
Tejun Heo 已提交
2269
				       1, 0x10000, GFP_ATOMIC);
J
Johannes Berg 已提交
2270 2271
			spin_unlock_irqrestore(&local->ack_status_lock, flags);

T
Tejun Heo 已提交
2272
			if (id >= 0) {
J
Johannes Berg 已提交
2273 2274 2275
				info_id = id;
				info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
			} else {
2276
				kfree_skb(ack_skb);
J
Johannes Berg 已提交
2277 2278 2279 2280
			}
		}
	}

2281 2282 2283 2284
	/*
	 * If the skb is shared we need to obtain our own copy.
	 */
	if (skb_shared(skb)) {
J
Johannes Berg 已提交
2285 2286 2287 2288 2289
		struct sk_buff *tmp_skb = skb;

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

2290
		skb = skb_clone(skb, GFP_ATOMIC);
2291 2292
		kfree_skb(tmp_skb);

2293 2294 2295 2296
		if (!skb) {
			ret = -ENOMEM;
			goto free;
		}
2297 2298
	}

2299
	hdr.frame_control = fc;
2300 2301 2302 2303 2304 2305 2306 2307
	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
2308
	} else if (ethertype >= ETH_P_802_3_MIN) {
2309 2310 2311 2312 2313 2314 2315 2316
		encaps_data = rfc1042_header;
		encaps_len = sizeof(rfc1042_header);
		skip_header_bytes -= 2;
	} else {
		encaps_data = NULL;
		encaps_len = 0;
	}

2317 2318 2319
	nh_pos = skb_network_header(skb) - skb->data;
	h_pos = skb_transport_header(skb) - skb->data;

2320 2321 2322 2323
	skb_pull(skb, skip_header_bytes);
	nh_pos -= skip_header_bytes;
	h_pos -= skip_header_bytes;

2324
	head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
2325

2326 2327 2328 2329 2330 2331 2332 2333 2334 2335 2336
	/*
	 * 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.
	 */
2337

2338
	if (head_need > 0 || skb_cloned(skb)) {
2339
		head_need += sdata->encrypt_headroom;
2340 2341
		head_need += local->tx_headroom;
		head_need = max_t(int, 0, head_need);
2342 2343
		if (ieee80211_skb_resize(sdata, skb, head_need, true)) {
			ieee80211_free_txskb(&local->hw, skb);
J
Johannes Berg 已提交
2344
			skb = NULL;
2345
			return ERR_PTR(-ENOMEM);
2346
		}
2347 2348 2349 2350 2351 2352 2353
	}

	if (encaps_data) {
		memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
		nh_pos += encaps_len;
		h_pos += encaps_len;
	}
2354

2355
#ifdef CONFIG_MAC80211_MESH
2356 2357 2358 2359 2360
	if (meshhdrlen > 0) {
		memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
		nh_pos += meshhdrlen;
		h_pos += meshhdrlen;
	}
2361
#endif
2362

2363
	if (ieee80211_is_data_qos(fc)) {
2364 2365
		__le16 *qos_control;

W
Weilong Chen 已提交
2366
		qos_control = (__le16 *) skb_push(skb, 2);
2367 2368 2369 2370 2371 2372 2373 2374 2375
		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);

2376 2377 2378 2379 2380 2381 2382 2383 2384 2385
	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);

2386
	info = IEEE80211_SKB_CB(skb);
J
Johannes Berg 已提交
2387 2388
	memset(info, 0, sizeof(*info));

J
Johannes Berg 已提交
2389 2390
	info->flags = info_flags;
	info->ack_frame_id = info_id;
2391
	info->band = band;
J
Johannes Berg 已提交
2392

2393 2394 2395 2396 2397 2398
	return skb;
 free:
	kfree_skb(skb);
	return ERR_PTR(ret);
}

J
Johannes Berg 已提交
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 2427 2428 2429 2430 2431 2432 2433 2434 2435 2436 2437 2438 2439 2440 2441 2442 2443 2444 2445 2446 2447 2448 2449 2450 2451 2452 2453 2454 2455 2456 2457 2458 2459 2460 2461
/*
 * 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;

	if (!(local->hw.flags & IEEE80211_HW_SUPPORT_FAST_XMIT))
		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);
	if (local->hw.flags & IEEE80211_HW_SUPPORTS_PS &&
	    !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS) &&
	    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 */
2462 2463
	if (local->hw.wiphy->frag_threshold != (u32)-1 &&
	    !local->ops->set_frag_threshold)
J
Johannes Berg 已提交
2464 2465 2466 2467 2468 2469 2470 2471 2472 2473 2474 2475 2476 2477
		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) {
2478 2479 2480 2481 2482 2483 2484
	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
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 2552 2553
	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) {
2554
		bool gen_iv, iv_spc, mmic;
J
Johannes Berg 已提交
2555 2556 2557

		gen_iv = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV;
		iv_spc = build.key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE;
2558
		mmic = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC;
J
Johannes Berg 已提交
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 2585 2586

		/* 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;
2587 2588 2589 2590 2591 2592 2593 2594 2595 2596 2597 2598 2599 2600 2601 2602 2603 2604 2605 2606 2607 2608
		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
2609
			goto out;
2610 2611 2612 2613 2614 2615 2616 2617 2618 2619 2620 2621 2622
		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
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 2720 2721 2722 2723 2724 2725 2726 2727 2728 2729 2730 2731 2732 2733 2734 2735 2736 2737 2738
		}

		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]);
		if (tid_tx &&
		    !test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state))
			return false;
	}

	/* 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;
	}

2739
	ieee80211_tx_stats(dev, skb->len + extra_head);
J
Johannes Berg 已提交
2740 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 2776 2777 2778 2779 2780 2781 2782 2783 2784 2785 2786 2787 2788 2789 2790 2791 2792 2793 2794 2795 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 2823 2824 2825 2826 2827 2828 2829 2830 2831 2832 2833 2834 2835 2836 2837 2838 2839 2840 2841 2842 2843 2844 2845

	/* 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;
	}

	sta->tx_msdu[tid]++;

	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;

	if (!(local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL)) {
		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:
			pn = atomic64_inc_return(&fast_tx->key->u.ccmp.tx_pn);
			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;
		case WLAN_CIPHER_SUITE_GCMP:
		case WLAN_CIPHER_SUITE_GCMP_256:
			pn = atomic64_inc_return(&fast_tx->key->u.gcmp.tx_pn);
			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;
}

2846 2847 2848 2849 2850
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);
2851
	struct sta_info *sta;
2852
	struct sk_buff *next;
2853 2854 2855 2856 2857 2858 2859

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

	rcu_read_lock();
2860

2861 2862
	if (ieee80211_lookup_ra_sta(sdata, skb, &sta))
		goto out_free;
2863

J
Johannes Berg 已提交
2864 2865 2866 2867 2868 2869 2870 2871 2872 2873
	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;
	}

2874 2875
	if (skb_is_gso(skb)) {
		struct sk_buff *segs;
2876

2877 2878
		segs = skb_gso_segment(skb, 0);
		if (IS_ERR(segs)) {
2879
			goto out_free;
2880 2881 2882 2883 2884 2885 2886 2887 2888 2889 2890 2891 2892 2893 2894 2895
		} 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) {
2896 2897
			skb_set_transport_header(skb,
						 skb_checksum_start_offset(skb));
2898 2899 2900
			if (skb_checksum_help(skb))
				goto out_free;
		}
2901 2902
	}

2903 2904 2905 2906
	next = skb;
	while (next) {
		skb = next;
		next = skb->next;
2907

2908 2909 2910 2911 2912 2913
		skb->prev = NULL;
		skb->next = NULL;

		skb = ieee80211_build_hdr(sdata, skb, info_flags, sta);
		if (IS_ERR(skb))
			goto out;
2914

2915
		ieee80211_tx_stats(dev, skb->len);
2916 2917 2918

		ieee80211_xmit(sdata, sta, skb);
	}
2919 2920 2921
	goto out;
 out_free:
	kfree_skb(skb);
2922
 out:
J
Johannes Berg 已提交
2923
	rcu_read_unlock();
2924 2925
}

2926 2927 2928 2929 2930 2931 2932
/**
 * 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.
 */
2933 2934 2935 2936 2937 2938
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;
}
2939

2940 2941 2942 2943 2944 2945 2946 2947 2948
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,
	};
2949
	struct sta_info *sta;
2950 2951 2952

	rcu_read_lock();

2953 2954 2955 2956 2957 2958 2959
	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);
2960 2961 2962 2963 2964 2965 2966 2967 2968 2969 2970 2971 2972 2973 2974 2975 2976 2977
	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;
}

2978 2979 2980 2981
/*
 * ieee80211_clear_tx_pending may not be called in a context where
 * it is possible that it packets could come in again.
 */
2982 2983
void ieee80211_clear_tx_pending(struct ieee80211_local *local)
{
2984
	struct sk_buff *skb;
J
Johannes Berg 已提交
2985
	int i;
2986

2987 2988 2989 2990
	for (i = 0; i < local->hw.queues; i++) {
		while ((skb = skb_dequeue(&local->pending[i])) != NULL)
			ieee80211_free_txskb(&local->hw, skb);
	}
2991 2992
}

2993 2994 2995 2996 2997
/*
 * 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.
 */
2998 2999 3000 3001 3002 3003 3004
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;
3005
	bool result;
J
Johannes Berg 已提交
3006
	struct ieee80211_chanctx_conf *chanctx_conf;
3007

3008
	sdata = vif_to_sdata(info->control.vif);
3009 3010

	if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) {
J
Johannes Berg 已提交
3011 3012 3013 3014 3015
		chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
		if (unlikely(!chanctx_conf)) {
			dev_kfree_skb(skb);
			return true;
		}
3016
		info->band = chanctx_conf->def.chan->band;
3017
		result = ieee80211_tx(sdata, NULL, skb, true);
3018
	} else {
3019 3020 3021 3022 3023
		struct sk_buff_head skbs;

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

3024
		hdr = (struct ieee80211_hdr *)skb->data;
3025
		sta = sta_info_get(sdata, hdr->addr1);
3026

3027
		result = __ieee80211_tx(local, &skbs, skb->len, sta, true);
3028 3029 3030 3031 3032
	}

	return result;
}

3033
/*
J
Johannes Berg 已提交
3034
 * Transmit all pending packets. Called from tasklet.
3035
 */
3036 3037 3038
void ieee80211_tx_pending(unsigned long data)
{
	struct ieee80211_local *local = (struct ieee80211_local *)data;
3039
	unsigned long flags;
3040
	int i;
J
Johannes Berg 已提交
3041
	bool txok;
3042

3043
	rcu_read_lock();
3044

J
Johannes Berg 已提交
3045
	spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
3046 3047 3048 3049 3050
	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
3051
		if (local->queue_stop_reasons[i] ||
3052
		    skb_queue_empty(&local->pending[i]))
3053
			continue;
3054

3055
		while (!skb_queue_empty(&local->pending[i])) {
J
Johannes Berg 已提交
3056
			struct sk_buff *skb = __skb_dequeue(&local->pending[i]);
3057 3058
			struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);

3059
			if (WARN_ON(!info->control.vif)) {
3060
				ieee80211_free_txskb(&local->hw, skb);
3061 3062 3063
				continue;
			}

J
Johannes Berg 已提交
3064 3065 3066 3067 3068 3069 3070
			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)
3071
				break;
3072
		}
3073 3074

		if (skb_queue_empty(&local->pending[i]))
3075
			ieee80211_propagate_queue_wake(local, i);
3076
	}
J
Johannes Berg 已提交
3077
	spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
3078

3079
	rcu_read_unlock();
3080 3081 3082 3083
}

/* functions for drivers to get certain frames */

3084
static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
3085 3086
				       struct ps_data *ps, struct sk_buff *skb,
				       bool is_template)
3087 3088 3089 3090 3091 3092 3093
{
	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. */
3094
	if (atomic_read(&ps->num_sta_ps) > 0)
3095 3096
		/* in the hope that this is faster than
		 * checking byte-for-byte */
W
Weilong Chen 已提交
3097
		have_bits = !bitmap_empty((unsigned long *)ps->tim,
3098
					  IEEE80211_MAX_AID+1);
3099 3100 3101 3102 3103 3104
	if (!is_template) {
		if (ps->dtim_count == 0)
			ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1;
		else
			ps->dtim_count--;
	}
3105 3106 3107 3108

	tim = pos = (u8 *) skb_put(skb, 6);
	*pos++ = WLAN_EID_TIM;
	*pos++ = 4;
3109
	*pos++ = ps->dtim_count;
3110
	*pos++ = sdata->vif.bss_conf.dtim_period;
3111

3112
	if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf))
3113 3114
		aid0 = 1;

3115
	ps->dtim_bc_mc = aid0 == 1;
3116

3117 3118 3119 3120 3121 3122
	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++) {
3123
			if (ps->tim[i]) {
3124 3125 3126 3127 3128 3129
				n1 = i & 0xfe;
				break;
			}
		}
		n2 = n1;
		for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
3130
			if (ps->tim[i]) {
3131 3132 3133 3134 3135 3136 3137 3138
				n2 = i;
				break;
			}
		}

		/* Bitmap control */
		*pos++ = n1 | aid0;
		/* Part Virt Bitmap */
3139
		skb_put(skb, n2 - n1);
3140
		memcpy(pos, ps->tim + n1, n2 - n1 + 1);
3141 3142 3143 3144 3145 3146 3147 3148

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

3149
static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
3150 3151
				    struct ps_data *ps, struct sk_buff *skb,
				    bool is_template)
3152 3153 3154 3155 3156 3157 3158 3159 3160 3161 3162
{
	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) {
3163
		__ieee80211_beacon_add_tim(sdata, ps, skb, is_template);
3164
	} else {
J
Johannes Berg 已提交
3165
		spin_lock_bh(&local->tim_lock);
3166
		__ieee80211_beacon_add_tim(sdata, ps, skb, is_template);
J
Johannes Berg 已提交
3167
		spin_unlock_bh(&local->tim_lock);
3168 3169 3170 3171 3172
	}

	return 0;
}

3173 3174
static void ieee80211_set_csa(struct ieee80211_sub_if_data *sdata,
			      struct beacon_data *beacon)
3175 3176
{
	struct probe_resp *resp;
3177 3178
	u8 *beacon_data;
	size_t beacon_data_len;
3179
	int i;
3180
	u8 count = beacon->csa_current_counter;
3181 3182 3183 3184 3185 3186 3187 3188 3189 3190

	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;
3191 3192 3193 3194
	case NL80211_IFTYPE_MESH_POINT:
		beacon_data = beacon->head;
		beacon_data_len = beacon->head_len;
		break;
3195 3196 3197
	default:
		return;
	}
3198

3199
	rcu_read_lock();
3200
	for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; ++i) {
3201
		resp = rcu_dereference(sdata->u.ap.probe_resp);
3202

3203 3204 3205
		if (beacon->csa_counter_offsets[i]) {
			if (WARN_ON_ONCE(beacon->csa_counter_offsets[i] >=
					 beacon_data_len)) {
3206 3207 3208
				rcu_read_unlock();
				return;
			}
3209 3210

			beacon_data[beacon->csa_counter_offsets[i]] = count;
3211
		}
3212 3213 3214

		if (sdata->vif.type == NL80211_IFTYPE_AP && resp)
			resp->data[resp->csa_counter_offsets[i]] = count;
3215
	}
3216
	rcu_read_unlock();
3217 3218 3219 3220 3221
}

u8 ieee80211_csa_update_counter(struct ieee80211_vif *vif)
{
	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
3222 3223
	struct beacon_data *beacon = NULL;
	u8 count = 0;
3224

3225 3226 3227 3228 3229 3230 3231 3232 3233 3234 3235 3236 3237
	rcu_read_lock();

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

	if (!beacon)
		goto unlock;

	beacon->csa_current_counter--;
3238 3239

	/* the counter should never reach 0 */
3240 3241
	WARN_ON_ONCE(!beacon->csa_current_counter);
	count = beacon->csa_current_counter;
3242

3243 3244 3245
unlock:
	rcu_read_unlock();
	return count;
3246
}
3247
EXPORT_SYMBOL(ieee80211_csa_update_counter);
3248 3249 3250 3251 3252 3253 3254 3255 3256 3257 3258 3259 3260 3261 3262 3263 3264 3265 3266 3267 3268

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;
3269 3270 3271 3272 3273 3274 3275
	} else if (vif->type == NL80211_IFTYPE_ADHOC) {
		struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;

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

3276 3277 3278 3279 3280 3281 3282 3283 3284
		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;

3285 3286
		beacon_data = beacon->head;
		beacon_data_len = beacon->head_len;
3287 3288 3289 3290 3291
	} else {
		WARN_ON(1);
		goto out;
	}

3292 3293 3294
	if (!beacon->csa_counter_offsets[0])
		goto out;

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

3298
	if (beacon_data[beacon->csa_counter_offsets[0]] == 1)
3299 3300 3301 3302 3303 3304 3305 3306
		ret = true;
 out:
	rcu_read_unlock();

	return ret;
}
EXPORT_SYMBOL(ieee80211_csa_is_complete);

3307 3308 3309 3310 3311
static struct sk_buff *
__ieee80211_beacon_get(struct ieee80211_hw *hw,
		       struct ieee80211_vif *vif,
		       struct ieee80211_mutable_offsets *offs,
		       bool is_template)
3312 3313
{
	struct ieee80211_local *local = hw_to_local(hw);
3314
	struct beacon_data *beacon = NULL;
3315
	struct sk_buff *skb = NULL;
3316
	struct ieee80211_tx_info *info;
3317
	struct ieee80211_sub_if_data *sdata = NULL;
J
Johannes Berg 已提交
3318
	enum ieee80211_band band;
3319
	struct ieee80211_tx_rate_control txrc;
J
Johannes Berg 已提交
3320
	struct ieee80211_chanctx_conf *chanctx_conf;
3321
	int csa_off_base = 0;
3322

3323
	rcu_read_lock();
3324

3325
	sdata = vif_to_sdata(vif);
J
Johannes Berg 已提交
3326
	chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3327

J
Johannes Berg 已提交
3328
	if (!ieee80211_sdata_running(sdata) || !chanctx_conf)
3329 3330
		goto out;

3331 3332
	if (offs)
		memset(offs, 0, sizeof(*offs));
3333

3334
	if (sdata->vif.type == NL80211_IFTYPE_AP) {
3335 3336
		struct ieee80211_if_ap *ap = &sdata->u.ap;

3337
		beacon = rcu_dereference(ap->beacon);
D
Dan Carpenter 已提交
3338
		if (beacon) {
3339
			if (beacon->csa_counter_offsets[0]) {
3340 3341 3342 3343 3344
				if (!is_template)
					ieee80211_csa_update_counter(vif);

				ieee80211_set_csa(sdata, beacon);
			}
3345

J
Johannes Berg 已提交
3346 3347 3348 3349 3350 3351
			/*
			 * headroom, head length,
			 * tail length and maximum TIM length
			 */
			skb = dev_alloc_skb(local->tx_headroom +
					    beacon->head_len +
3352 3353
					    beacon->tail_len + 256 +
					    local->hw.extra_beacon_tailroom);
J
Johannes Berg 已提交
3354 3355
			if (!skb)
				goto out;
3356

J
Johannes Berg 已提交
3357 3358 3359
			skb_reserve(skb, local->tx_headroom);
			memcpy(skb_put(skb, beacon->head_len), beacon->head,
			       beacon->head_len);
3360

3361 3362
			ieee80211_beacon_add_tim(sdata, &ap->ps, skb,
						 is_template);
3363

3364 3365 3366
			if (offs) {
				offs->tim_offset = beacon->head_len;
				offs->tim_length = skb->len - beacon->head_len;
3367 3368 3369

				/* for AP the csa offsets are from tail */
				csa_off_base = skb->len;
3370
			}
3371

J
Johannes Berg 已提交
3372 3373 3374
			if (beacon->tail)
				memcpy(skb_put(skb, beacon->tail_len),
				       beacon->tail, beacon->tail_len);
3375 3376
		} else
			goto out;
3377
	} else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
3378
		struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
3379
		struct ieee80211_hdr *hdr;
3380

3381 3382
		beacon = rcu_dereference(ifibss->presp);
		if (!beacon)
3383 3384
			goto out;

3385
		if (beacon->csa_counter_offsets[0]) {
3386 3387
			if (!is_template)
				ieee80211_csa_update_counter(vif);
3388

3389
			ieee80211_set_csa(sdata, beacon);
3390
		}
3391

3392
		skb = dev_alloc_skb(local->tx_headroom + beacon->head_len +
3393
				    local->hw.extra_beacon_tailroom);
3394 3395
		if (!skb)
			goto out;
3396
		skb_reserve(skb, local->tx_headroom);
3397 3398
		memcpy(skb_put(skb, beacon->head_len), beacon->head,
		       beacon->head_len);
3399 3400

		hdr = (struct ieee80211_hdr *) skb->data;
3401 3402
		hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
						 IEEE80211_STYPE_BEACON);
J
Johannes Berg 已提交
3403
	} else if (ieee80211_vif_is_mesh(&sdata->vif)) {
3404
		struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
3405

3406 3407
		beacon = rcu_dereference(ifmsh->beacon);
		if (!beacon)
3408 3409
			goto out;

3410
		if (beacon->csa_counter_offsets[0]) {
3411 3412 3413 3414 3415 3416 3417 3418
			if (!is_template)
				/* TODO: For mesh csa_counter is in TU, so
				 * decrementing it by one isn't correct, but
				 * for now we leave it consistent with overall
				 * mac80211's behavior.
				 */
				ieee80211_csa_update_counter(vif);

3419
			ieee80211_set_csa(sdata, beacon);
3420
		}
3421

3422
		if (ifmsh->sync_ops)
3423
			ifmsh->sync_ops->adjust_tbtt(sdata, beacon);
3424

3425
		skb = dev_alloc_skb(local->tx_headroom +
3426
				    beacon->head_len +
M
Marco Porsch 已提交
3427
				    256 + /* TIM IE */
3428
				    beacon->tail_len +
3429
				    local->hw.extra_beacon_tailroom);
J
Johannes Berg 已提交
3430 3431
		if (!skb)
			goto out;
T
Thomas Pedersen 已提交
3432
		skb_reserve(skb, local->tx_headroom);
3433 3434
		memcpy(skb_put(skb, beacon->head_len), beacon->head,
		       beacon->head_len);
3435 3436 3437
		ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb, is_template);

		if (offs) {
3438 3439
			offs->tim_offset = beacon->head_len;
			offs->tim_length = skb->len - beacon->head_len;
3440 3441
		}

3442 3443
		memcpy(skb_put(skb, beacon->tail_len), beacon->tail,
		       beacon->tail_len);
3444 3445
	} else {
		WARN_ON(1);
3446
		goto out;
3447 3448
	}

3449
	/* CSA offsets */
3450
	if (offs && beacon) {
3451 3452 3453
		int i;

		for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; i++) {
3454
			u16 csa_off = beacon->csa_counter_offsets[i];
3455 3456 3457 3458 3459 3460 3461 3462

			if (!csa_off)
				continue;

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

3463
	band = chanctx_conf->def.chan->band;
J
Johannes Berg 已提交
3464

3465 3466
	info = IEEE80211_SKB_CB(skb);

J
Johannes Berg 已提交
3467
	info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
3468
	info->flags |= IEEE80211_TX_CTL_NO_ACK;
3469
	info->band = band;
3470 3471 3472

	memset(&txrc, 0, sizeof(txrc));
	txrc.hw = hw;
3473
	txrc.sband = local->hw.wiphy->bands[band];
3474 3475 3476
	txrc.bss_conf = &sdata->vif.bss_conf;
	txrc.skb = skb;
	txrc.reported_rate.idx = -1;
3477
	txrc.rate_idx_mask = sdata->rc_rateidx_mask[band];
3478
	if (txrc.rate_idx_mask == (1 << txrc.sband->n_bitrates) - 1)
3479 3480 3481
		txrc.max_rate_idx = -1;
	else
		txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
3482
	txrc.bss = true;
3483
	rate_control_get_rate(sdata, NULL, &txrc);
3484 3485

	info->control.vif = vif;
3486

3487 3488 3489
	info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT |
			IEEE80211_TX_CTL_ASSIGN_SEQ |
			IEEE80211_TX_CTL_FIRST_FRAGMENT;
3490
 out:
3491
	rcu_read_unlock();
3492
	return skb;
3493 3494 3495 3496 3497 3498 3499 3500 3501 3502 3503 3504 3505 3506 3507 3508 3509 3510 3511 3512 3513 3514 3515 3516 3517 3518

}

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;
3519
}
3520
EXPORT_SYMBOL(ieee80211_beacon_get_tim);
3521

3522 3523 3524 3525
struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw,
					struct ieee80211_vif *vif)
{
	struct ieee80211_if_ap *ap = NULL;
3526 3527
	struct sk_buff *skb = NULL;
	struct probe_resp *presp = NULL;
3528 3529 3530 3531 3532 3533 3534 3535 3536 3537 3538 3539 3540
	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;

3541
	skb = dev_alloc_skb(presp->len);
3542 3543 3544
	if (!skb)
		goto out;

3545 3546
	memcpy(skb_put(skb, presp->len), presp->data, presp->len);

3547 3548 3549 3550 3551 3552 3553 3554 3555
	hdr = (struct ieee80211_hdr *) skb->data;
	memset(hdr->addr1, 0, sizeof(hdr->addr1));

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

3556 3557 3558 3559 3560 3561 3562 3563 3564 3565 3566 3567 3568 3569 3570 3571 3572
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));
3573
	if (!skb)
3574
		return NULL;
3575

3576 3577 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
	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));
3611
	if (!skb)
3612
		return NULL;
3613

3614 3615 3616 3617 3618 3619 3620 3621 3622 3623 3624 3625 3626 3627 3628 3629
	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);

3630
struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw,
3631
				       const u8 *src_addr,
3632
				       const u8 *ssid, size_t ssid_len,
3633
				       size_t tailroom)
3634
{
3635
	struct ieee80211_local *local = hw_to_local(hw);
3636 3637 3638 3639 3640 3641 3642 3643
	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) +
3644
			    ie_ssid_len + tailroom);
3645
	if (!skb)
3646 3647 3648 3649 3650 3651 3652 3653
		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
3654
	eth_broadcast_addr(hdr->addr1);
3655
	memcpy(hdr->addr2, src_addr, ETH_ALEN);
J
Johannes Berg 已提交
3656
	eth_broadcast_addr(hdr->addr3);
3657 3658 3659 3660

	pos = skb_put(skb, ie_ssid_len);
	*pos++ = WLAN_EID_SSID;
	*pos++ = ssid_len;
3661
	if (ssid_len)
3662 3663 3664 3665 3666 3667 3668
		memcpy(pos, ssid, ssid_len);
	pos += ssid_len;

	return skb;
}
EXPORT_SYMBOL(ieee80211_probereq_get);

3669
void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
3670
		       const void *frame, size_t frame_len,
3671
		       const struct ieee80211_tx_info *frame_txctl,
3672 3673 3674 3675
		       struct ieee80211_rts *rts)
{
	const struct ieee80211_hdr *hdr = frame;

3676 3677
	rts->frame_control =
	    cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
3678 3679
	rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
					       frame_txctl);
3680 3681 3682 3683 3684
	memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
	memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
}
EXPORT_SYMBOL(ieee80211_rts_get);

3685
void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
3686
			     const void *frame, size_t frame_len,
3687
			     const struct ieee80211_tx_info *frame_txctl,
3688 3689 3690 3691
			     struct ieee80211_cts *cts)
{
	const struct ieee80211_hdr *hdr = frame;

3692 3693
	cts->frame_control =
	    cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
3694 3695
	cts->duration = ieee80211_ctstoself_duration(hw, vif,
						     frame_len, frame_txctl);
3696 3697 3698 3699 3700
	memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
}
EXPORT_SYMBOL(ieee80211_ctstoself_get);

struct sk_buff *
3701
ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
3702
			  struct ieee80211_vif *vif)
3703 3704
{
	struct ieee80211_local *local = hw_to_local(hw);
3705
	struct sk_buff *skb = NULL;
3706
	struct ieee80211_tx_data tx;
3707
	struct ieee80211_sub_if_data *sdata;
3708
	struct ps_data *ps;
3709
	struct ieee80211_tx_info *info;
J
Johannes Berg 已提交
3710
	struct ieee80211_chanctx_conf *chanctx_conf;
3711

3712
	sdata = vif_to_sdata(vif);
3713 3714

	rcu_read_lock();
J
Johannes Berg 已提交
3715
	chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3716

3717 3718 3719 3720 3721 3722 3723 3724 3725 3726 3727
	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
3728 3729
	} else if (ieee80211_vif_is_mesh(&sdata->vif)) {
		ps = &sdata->u.mesh.ps;
3730
	} else {
3731
		goto out;
3732
	}
3733

3734
	if (ps->dtim_count != 0 || !ps->dtim_bc_mc)
3735
		goto out; /* send buffered bc/mc only after DTIM beacon */
3736

3737
	while (1) {
3738
		skb = skb_dequeue(&ps->bc_buf);
3739
		if (!skb)
3740
			goto out;
3741 3742
		local->total_ps_buffered--;

3743
		if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) {
3744 3745 3746 3747 3748 3749 3750 3751 3752
			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);
		}

3753
		if (sdata->vif.type == NL80211_IFTYPE_AP)
3754
			sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev);
3755
		if (!ieee80211_tx_prepare(sdata, &tx, NULL, skb))
3756 3757 3758
			break;
		dev_kfree_skb_any(skb);
	}
3759 3760 3761

	info = IEEE80211_SKB_CB(skb);

3762
	tx.flags |= IEEE80211_TX_PS_BUFFERED;
3763
	info->band = chanctx_conf->def.chan->band;
3764

3765
	if (invoke_tx_handlers(&tx))
3766
		skb = NULL;
3767
 out:
3768
	rcu_read_unlock();
3769 3770 3771 3772

	return skb;
}
EXPORT_SYMBOL(ieee80211_get_buffered_bc);
J
Johannes Berg 已提交
3773

3774 3775 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 3818 3819 3820 3821
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 */
	if (local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION) {
		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]]);
3822
	__ieee80211_flush_queues(local, sdata, queues, false);
3823 3824 3825 3826 3827 3828 3829 3830 3831 3832 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

	sta->reserved_tid = tid;

	ieee80211_wake_vif_queues(local, sdata,
				  IEEE80211_QUEUE_STOP_REASON_RESERVE_TID);

	if (local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION)
		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
3865 3866 3867
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
3868
{
3869
	int ac = ieee802_1d_to_ac[tid & 7];
3870

J
Johannes Berg 已提交
3871 3872 3873 3874
	skb_set_mac_header(skb, 0);
	skb_set_network_header(skb, 0);
	skb_set_transport_header(skb, 0);

3875
	skb_set_queue_mapping(skb, ac);
3876
	skb->priority = tid;
3877

3878 3879
	skb->dev = sdata->dev;

3880 3881 3882 3883 3884 3885
	/*
	 * 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();
3886
	IEEE80211_SKB_CB(skb)->band = band;
3887
	ieee80211_xmit(sdata, NULL, skb);
3888
	local_bh_enable();
J
Johannes Berg 已提交
3889
}