tx.c 103.1 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 __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);
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	}

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	return TX_CONTINUE;
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}

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static ieee80211_tx_result debug_noinline
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ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx)
549
{
550
	if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED))
551
		return TX_CONTINUE;
552

553
	if (tx->flags & IEEE80211_TX_UNICAST)
554 555 556 557 558
		return ieee80211_tx_h_unicast_ps_buf(tx);
	else
		return ieee80211_tx_h_multicast_ps_buf(tx);
}

559 560 561 562 563
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);

564 565 566 567
	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;
568
		info->flags |= IEEE80211_TX_CTL_USE_MINRATE;
569
	}
570 571 572 573

	return TX_CONTINUE;
}

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

J
Johannes Berg 已提交
581
	if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT))
582
		tx->key = NULL;
583 584
	else if (tx->sta &&
		 (key = rcu_dereference(tx->sta->ptk[tx->sta->ptk_idx])))
585
		tx->key = key;
586
	else if (ieee80211_is_mgmt(hdr->frame_control) &&
587
		 is_multicast_ether_addr(hdr->addr1) &&
588
		 ieee80211_is_robust_mgmt_frame(tx->skb) &&
589 590
		 (key = rcu_dereference(tx->sdata->default_mgmt_key)))
		tx->key = key;
591 592 593 594 595
	else if (is_multicast_ether_addr(hdr->addr1) &&
		 (key = rcu_dereference(tx->sdata->default_multicast_key)))
		tx->key = key;
	else if (!is_multicast_ether_addr(hdr->addr1) &&
		 (key = rcu_dereference(tx->sdata->default_unicast_key)))
596
		tx->key = key;
597
	else
598
		tx->key = NULL;
599 600

	if (tx->key) {
601 602
		bool skip_hw = false;

603
		tx->key->tx_rx_count++;
604
		/* TODO: add threshold stuff again */
605

606 607 608 609
		switch (tx->key->conf.cipher) {
		case WLAN_CIPHER_SUITE_WEP40:
		case WLAN_CIPHER_SUITE_WEP104:
		case WLAN_CIPHER_SUITE_TKIP:
610
			if (!ieee80211_is_data_present(hdr->frame_control))
611 612
				tx->key = NULL;
			break;
613
		case WLAN_CIPHER_SUITE_CCMP:
J
Jouni Malinen 已提交
614
		case WLAN_CIPHER_SUITE_CCMP_256:
615 616
		case WLAN_CIPHER_SUITE_GCMP:
		case WLAN_CIPHER_SUITE_GCMP_256:
617 618 619 620
			if (!ieee80211_is_data_present(hdr->frame_control) &&
			    !ieee80211_use_mfp(hdr->frame_control, tx->sta,
					       tx->skb))
				tx->key = NULL;
621 622
			else
				skip_hw = (tx->key->conf.flags &
623
					   IEEE80211_KEY_FLAG_SW_MGMT_TX) &&
624
					ieee80211_is_mgmt(hdr->frame_control);
625
			break;
626
		case WLAN_CIPHER_SUITE_AES_CMAC:
627
		case WLAN_CIPHER_SUITE_BIP_CMAC_256:
628 629
		case WLAN_CIPHER_SUITE_BIP_GMAC_128:
		case WLAN_CIPHER_SUITE_BIP_GMAC_256:
630 631 632
			if (!ieee80211_is_mgmt(hdr->frame_control))
				tx->key = NULL;
			break;
633
		}
634

635 636
		if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED &&
			     !ieee80211_is_deauth(hdr->frame_control)))
637 638
			return TX_DROP;

J
Johannes Berg 已提交
639
		if (!skip_hw && tx->key &&
J
Johannes Berg 已提交
640
		    tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
641
			info->control.hw_key = &tx->key->conf;
642 643
	}

644
	return TX_CONTINUE;
645 646
}

647
static ieee80211_tx_result debug_noinline
648
ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
649
{
650
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
651 652
	struct ieee80211_hdr *hdr = (void *)tx->skb->data;
	struct ieee80211_supported_band *sband;
S
Shanyu Zhao 已提交
653
	u32 len;
654
	struct ieee80211_tx_rate_control txrc;
655
	struct ieee80211_sta_rates *ratetbl = NULL;
J
Johannes Berg 已提交
656
	bool assoc = false;
657

658
	memset(&txrc, 0, sizeof(txrc));
659

660
	sband = tx->local->hw.wiphy->bands[info->band];
661

S
Shanyu Zhao 已提交
662
	len = min_t(u32, tx->skb->len + FCS_LEN,
663
			 tx->local->hw.wiphy->frag_threshold);
664 665

	/* set up the tx rate control struct we give the RC algo */
J
Johannes Berg 已提交
666
	txrc.hw = &tx->local->hw;
667 668 669 670
	txrc.sband = sband;
	txrc.bss_conf = &tx->sdata->vif.bss_conf;
	txrc.skb = tx->skb;
	txrc.reported_rate.idx = -1;
671
	txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band];
672 673 674 675
	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;
676 677 678 679 680

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

681
	txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
682
		    tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT ||
683
		    tx->sdata->vif.type == NL80211_IFTYPE_ADHOC);
684 685

	/* set up RTS protection if desired */
686
	if (len > tx->local->hw.wiphy->rts_threshold) {
687
		txrc.rts = true;
688 689
	}

690
	info->control.use_rts = txrc.rts;
691 692
	info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot;

693 694 695 696 697 698 699 700
	/*
	 * 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
701
	     (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE))))
702 703 704
		txrc.short_preamble = true;

	info->control.short_preamble = txrc.short_preamble;
705

J
Johannes Berg 已提交
706 707
	if (tx->sta)
		assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
708 709 710 711 712

	/*
	 * 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
713
	if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc &&
714 715 716 717
		 !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",
718
		 tx->sdata->name, hdr->addr1,
719
		 info->band ? 5 : 2))
720
		return TX_DROP;
721

722 723 724 725
	/*
	 * If we're associated with the sta at this point we know we can at
	 * least send the frame at the lowest bit rate.
	 */
726 727
	rate_control_get_rate(tx->sdata, tx->sta, &txrc);

728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748
	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];
	}
749

750
	if (txrc.reported_rate.idx < 0) {
751
		txrc.reported_rate = tx->rate;
752 753 754
		if (tx->sta && ieee80211_is_data(hdr->frame_control))
			tx->sta->last_tx_rate = txrc.reported_rate;
	} else if (tx->sta)
755
		tx->sta->last_tx_rate = txrc.reported_rate;
756

757 758 759
	if (ratetbl)
		return TX_CONTINUE;

760 761
	if (unlikely(!info->control.rates[0].count))
		info->control.rates[0].count = 1;
762

763 764 765 766
	if (WARN_ON_ONCE((info->control.rates[0].count > 1) &&
			 (info->flags & IEEE80211_TX_CTL_NO_ACK)))
		info->control.rates[0].count = 1;

767 768 769
	return TX_CONTINUE;
}

770 771 772 773 774 775 776 777 778 779 780
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;
}

781 782 783 784 785 786 787 788
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;

789 790 791 792 793
	/*
	 * 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.
	 */
794
	if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR))
795 796
		return TX_CONTINUE;

797 798 799 800 801 802
	if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
		return TX_CONTINUE;

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

803 804 805
	if (ieee80211_is_qos_nullfunc(hdr->frame_control))
		return TX_CONTINUE;

J
Johannes Berg 已提交
806 807 808
	/*
	 * Anything but QoS data that has a sequence number field
	 * (is long enough) gets a sequence number from the global
809 810
	 * 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
811
	 */
812 813
	if (!ieee80211_is_data_qos(hdr->frame_control) ||
	    is_multicast_ether_addr(hdr->addr1)) {
J
Johannes Berg 已提交
814
		/* driver should assign sequence number */
815
		info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
J
Johannes Berg 已提交
816 817 818
		/* 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;
819 820
		if (tx->sta)
			tx->sta->tx_msdu[IEEE80211_NUM_TIDS]++;
821 822 823 824 825 826 827 828 829 830 831 832 833 834 835
		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;
836
	tx->sta->tx_msdu[tid]++;
837

838 839
	if (!tx->sta->sta.txq[0])
		hdr->seq_ctrl = ieee80211_tx_next_seq(tx->sta, tid);
840 841 842 843

	return TX_CONTINUE;
}

844
static int ieee80211_fragment(struct ieee80211_tx_data *tx,
J
Johannes Berg 已提交
845 846 847
			      struct sk_buff *skb, int hdrlen,
			      int frag_threshold)
{
848
	struct ieee80211_local *local = tx->local;
849
	struct ieee80211_tx_info *info;
850
	struct sk_buff *tmp;
J
Johannes Berg 已提交
851 852 853 854 855 856 857
	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;

858 859
	/* first fragment was already added to queue by caller */

J
Johannes Berg 已提交
860 861 862 863 864 865 866 867
	while (rem) {
		int fraglen = per_fragm;

		if (fraglen > rem)
			fraglen = rem;
		rem -= fraglen;
		tmp = dev_alloc_skb(local->tx_headroom +
				    frag_threshold +
868
				    tx->sdata->encrypt_headroom +
J
Johannes Berg 已提交
869 870 871
				    IEEE80211_ENCRYPT_TAILROOM);
		if (!tmp)
			return -ENOMEM;
872 873 874

		__skb_queue_tail(&tx->skbs, tmp);

875 876 877
		skb_reserve(tmp,
			    local->tx_headroom + tx->sdata->encrypt_headroom);

J
Johannes Berg 已提交
878 879
		/* copy control information */
		memcpy(tmp->cb, skb->cb, sizeof(tmp->cb));
880 881 882 883 884 885 886 887

		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
888 889 890 891 892 893 894 895 896 897 898
		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;
	}

899
	/* adjust first fragment's length */
900
	skb_trim(skb, hdrlen + per_fragm);
J
Johannes Berg 已提交
901 902 903
	return 0;
}

904
static ieee80211_tx_result debug_noinline
905 906
ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
{
J
Johannes Berg 已提交
907 908 909
	struct sk_buff *skb = tx->skb;
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
	struct ieee80211_hdr *hdr = (void *)skb->data;
910
	int frag_threshold = tx->local->hw.wiphy->frag_threshold;
J
Johannes Berg 已提交
911 912
	int hdrlen;
	int fragnum;
913

914 915 916 917
	/* no matter what happens, tx->skb moves to tx->skbs */
	__skb_queue_tail(&tx->skbs, skb);
	tx->skb = NULL;

918 919 920 921
	if (info->flags & IEEE80211_TX_CTL_DONTFRAG)
		return TX_CONTINUE;

	if (tx->local->ops->set_frag_threshold)
922 923
		return TX_CONTINUE;

924 925
	/*
	 * Warn when submitting a fragmented A-MPDU frame and drop it.
J
Johannes Berg 已提交
926
	 * This scenario is handled in ieee80211_tx_prepare but extra
927
	 * caution taken here as fragmented ampdu may cause Tx stop.
928
	 */
S
Sujith 已提交
929
	if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
930 931
		return TX_DROP;

932
	hdrlen = ieee80211_hdrlen(hdr->frame_control);
933

934
	/* internal error, why isn't DONTFRAG set? */
935
	if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))
J
Johannes Berg 已提交
936
		return TX_DROP;
937

J
Johannes Berg 已提交
938 939 940 941 942 943 944 945
	/*
	 * 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.
	 */
946
	if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold))
J
Johannes Berg 已提交
947
		return TX_DROP;
948

J
Johannes Berg 已提交
949 950
	/* update duration/seq/flags of fragments */
	fragnum = 0;
951 952

	skb_queue_walk(&tx->skbs, skb) {
J
Johannes Berg 已提交
953
		const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
954

J
Johannes Berg 已提交
955 956
		hdr = (void *)skb->data;
		info = IEEE80211_SKB_CB(skb);
957

958
		if (!skb_queue_is_last(&tx->skbs, skb)) {
J
Johannes Berg 已提交
959
			hdr->frame_control |= morefrags;
960 961 962 963 964 965 966
			/*
			 * 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;
967
			BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4);
968
			info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
J
Johannes Berg 已提交
969 970
		} else {
			hdr->frame_control &= ~morefrags;
971
		}
J
Johannes Berg 已提交
972 973
		hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG);
		fragnum++;
974
	}
975

976
	return TX_CONTINUE;
977 978
}

979 980 981
static ieee80211_tx_result debug_noinline
ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
{
982
	struct sk_buff *skb;
983
	int ac = -1;
984 985 986 987

	if (!tx->sta)
		return TX_CONTINUE;

988
	skb_queue_walk(&tx->skbs, skb) {
989
		ac = skb_get_queue_mapping(skb);
990
		tx->sta->tx_fragments++;
991
		tx->sta->tx_bytes[ac] += skb->len;
992
	}
993 994
	if (ac >= 0)
		tx->sta->tx_packets[ac]++;
995 996 997 998

	return TX_CONTINUE;
}

999
static ieee80211_tx_result debug_noinline
1000 1001 1002 1003 1004
ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
{
	if (!tx->key)
		return TX_CONTINUE;

1005 1006 1007
	switch (tx->key->conf.cipher) {
	case WLAN_CIPHER_SUITE_WEP40:
	case WLAN_CIPHER_SUITE_WEP104:
1008
		return ieee80211_crypto_wep_encrypt(tx);
1009
	case WLAN_CIPHER_SUITE_TKIP:
1010
		return ieee80211_crypto_tkip_encrypt(tx);
1011
	case WLAN_CIPHER_SUITE_CCMP:
J
Jouni Malinen 已提交
1012 1013 1014 1015 1016
		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);
1017
	case WLAN_CIPHER_SUITE_AES_CMAC:
1018
		return ieee80211_crypto_aes_cmac_encrypt(tx);
1019 1020
	case WLAN_CIPHER_SUITE_BIP_CMAC_256:
		return ieee80211_crypto_aes_cmac_256_encrypt(tx);
1021 1022 1023
	case WLAN_CIPHER_SUITE_BIP_GMAC_128:
	case WLAN_CIPHER_SUITE_BIP_GMAC_256:
		return ieee80211_crypto_aes_gmac_encrypt(tx);
1024 1025 1026
	case WLAN_CIPHER_SUITE_GCMP:
	case WLAN_CIPHER_SUITE_GCMP_256:
		return ieee80211_crypto_gcmp_encrypt(tx);
1027
	default:
1028
		return ieee80211_crypto_hw_encrypt(tx);
1029 1030 1031 1032 1033
	}

	return TX_DROP;
}

1034
static ieee80211_tx_result debug_noinline
J
Johannes Berg 已提交
1035 1036
ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
{
1037
	struct sk_buff *skb;
J
Johannes Berg 已提交
1038 1039 1040
	struct ieee80211_hdr *hdr;
	int next_len;
	bool group_addr;
J
Johannes Berg 已提交
1041

1042
	skb_queue_walk(&tx->skbs, skb) {
J
Johannes Berg 已提交
1043
		hdr = (void *) skb->data;
1044 1045
		if (unlikely(ieee80211_is_pspoll(hdr->frame_control)))
			break; /* must not overwrite AID */
1046 1047 1048 1049 1050
		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
1051
		group_addr = is_multicast_ether_addr(hdr->addr1);
J
Johannes Berg 已提交
1052

J
Johannes Berg 已提交
1053
		hdr->duration_id =
1054 1055
			ieee80211_duration(tx, skb, group_addr, next_len);
	}
J
Johannes Berg 已提交
1056 1057 1058 1059

	return TX_CONTINUE;
}

1060 1061
/* actual transmit path */

1062 1063 1064 1065 1066 1067 1068
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;
1069
	bool reset_agg_timer = false;
1070
	struct sk_buff *purge_skb = NULL;
1071 1072 1073

	if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
		info->flags |= IEEE80211_TX_CTL_AMPDU;
1074
		reset_agg_timer = true;
1075 1076 1077 1078 1079
	} 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
		 */
1080
	} else if (!tx->sta->sta.txq[tid]) {
1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099
		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
1100
		tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid);
1101 1102 1103 1104 1105

		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;
1106
			reset_agg_timer = true;
1107 1108 1109 1110
		} else {
			queued = true;
			info->control.vif = &tx->sdata->vif;
			info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1111
			info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
1112
			__skb_queue_tail(&tid_tx->pending, skb);
1113 1114
			if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER)
				purge_skb = __skb_dequeue(&tid_tx->pending);
1115 1116
		}
		spin_unlock(&tx->sta->lock);
1117 1118

		if (purge_skb)
1119
			ieee80211_free_txskb(&tx->local->hw, purge_skb);
1120 1121
	}

1122 1123
	/* reset session timer */
	if (reset_agg_timer && tid_tx->timeout)
1124
		tid_tx->last_tx = jiffies;
1125

1126 1127 1128
	return queued;
}

1129 1130
/*
 * initialises @tx
1131 1132
 * pass %NULL for the station if unknown, a valid pointer if known
 * or an ERR_PTR() if the station is known not to exist
1133
 */
1134
static ieee80211_tx_result
J
Johannes Berg 已提交
1135 1136
ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
		     struct ieee80211_tx_data *tx,
1137
		     struct sta_info *sta, struct sk_buff *skb)
1138
{
J
Johannes Berg 已提交
1139
	struct ieee80211_local *local = sdata->local;
1140
	struct ieee80211_hdr *hdr;
1141
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
J
Johannes Berg 已提交
1142
	int tid;
1143
	u8 *qc;
1144 1145 1146 1147

	memset(tx, 0, sizeof(*tx));
	tx->skb = skb;
	tx->local = local;
J
Johannes Berg 已提交
1148
	tx->sdata = sdata;
1149
	__skb_queue_head_init(&tx->skbs);
1150

1151 1152 1153 1154 1155 1156 1157
	/*
	 * 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;

1158 1159
	hdr = (struct ieee80211_hdr *) skb->data;

1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174
	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);
1175
	}
1176

1177
	if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) &&
1178
	    !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
1179 1180
	    (local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION) &&
	    !(local->hw.flags & IEEE80211_HW_TX_AMPDU_SETUP_IN_HW)) {
1181 1182
		struct tid_ampdu_tx *tid_tx;

S
Sujith 已提交
1183 1184 1185
		qc = ieee80211_get_qos_ctl(hdr);
		tid = *qc & IEEE80211_QOS_CTL_TID_MASK;

1186 1187 1188
		tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
		if (tid_tx) {
			bool queued;
1189

1190 1191 1192 1193 1194 1195
			queued = ieee80211_tx_prep_agg(tx, skb, info,
						       tid_tx, tid);

			if (unlikely(queued))
				return TX_QUEUED;
		}
S
Sujith 已提交
1196 1197
	}

1198
	if (is_multicast_ether_addr(hdr->addr1)) {
1199
		tx->flags &= ~IEEE80211_TX_UNICAST;
1200
		info->flags |= IEEE80211_TX_CTL_NO_ACK;
1201
	} else
1202
		tx->flags |= IEEE80211_TX_UNICAST;
1203

1204 1205 1206 1207 1208
	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;
1209 1210
	}

1211
	if (!tx->sta)
1212
		info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
J
Johannes Berg 已提交
1213
	else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT))
1214
		info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1215

1216
	info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
1217

1218
	return TX_CONTINUE;
1219 1220
}

1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310
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);

1311 1312 1313 1314 1315
static bool ieee80211_tx_frags(struct ieee80211_local *local,
			       struct ieee80211_vif *vif,
			       struct ieee80211_sta *sta,
			       struct sk_buff_head *skbs,
			       bool txpending)
1316
{
1317
	struct sk_buff *skb, *tmp;
J
Johannes Berg 已提交
1318
	unsigned long flags;
1319

1320
	skb_queue_walk_safe(skbs, skb, tmp) {
1321 1322 1323 1324 1325 1326
		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);
1327
			ieee80211_free_txskb(&local->hw, skb);
1328 1329 1330
			continue;
		}
#endif
J
Johannes Berg 已提交
1331 1332 1333

		spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
		if (local->queue_stop_reasons[q] ||
1334
		    (!txpending && !skb_queue_empty(&local->pending[q]))) {
1335
			if (unlikely(info->flags &
1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353
				     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 {

1354
				/*
1355 1356 1357
				 * Since queue is stopped, queue up frames for
				 * later transmission from the tx-pending
				 * tasklet when the queue is woken again.
1358
				 */
1359 1360 1361 1362 1363 1364 1365 1366 1367 1368
				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;
1369
			}
1370
		}
J
Johannes Berg 已提交
1371
		spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1372

1373
		info->control.vif = vif;
1374

1375
		__skb_unlink(skb, skbs);
1376
		ieee80211_drv_tx(local, vif, sta, skb);
1377
	}
1378

1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395
	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;
1396

1397 1398
	if (WARN_ON(skb_queue_empty(skbs)))
		return true;
J
Johannes Berg 已提交
1399

1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413
	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:
1414 1415 1416 1417
		if (sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE) {
			vif = &sdata->vif;
			break;
		}
1418
		sdata = rcu_dereference(local->monitor_sdata);
1419
		if (sdata) {
1420
			vif = &sdata->vif;
1421 1422 1423 1424 1425 1426
			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
1427
			vif = NULL;
1428 1429 1430 1431 1432 1433 1434 1435
		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;
1436
	}
J
Johannes Berg 已提交
1437

1438 1439
	result = ieee80211_tx_frags(local, vif, pubsta, skbs,
				    txpending);
1440

1441 1442
	ieee80211_tpt_led_trig_tx(local, fc, led_len);

J
Johannes Berg 已提交
1443
	WARN_ON_ONCE(!skb_queue_empty(skbs));
1444

1445
	return result;
1446 1447
}

1448 1449 1450 1451 1452 1453
/*
 * 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)
{
1454
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
1455 1456
	ieee80211_tx_result res = TX_DROP;

1457 1458 1459 1460 1461 1462 1463
#define CALL_TXH(txh) \
	do {				\
		res = txh(tx);		\
		if (res != TX_CONTINUE)	\
			goto txh_done;	\
	} while (0)

1464
	CALL_TXH(ieee80211_tx_h_dynamic_ps);
1465 1466
	CALL_TXH(ieee80211_tx_h_check_assoc);
	CALL_TXH(ieee80211_tx_h_ps_buf);
1467
	CALL_TXH(ieee80211_tx_h_check_control_port_protocol);
1468
	CALL_TXH(ieee80211_tx_h_select_key);
1469 1470
	if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
		CALL_TXH(ieee80211_tx_h_rate_ctrl);
1471

J
Johannes Berg 已提交
1472 1473 1474
	if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) {
		__skb_queue_tail(&tx->skbs, tx->skb);
		tx->skb = NULL;
1475
		goto txh_done;
J
Johannes Berg 已提交
1476
	}
1477 1478

	CALL_TXH(ieee80211_tx_h_michael_mic_add);
1479 1480
	CALL_TXH(ieee80211_tx_h_sequence);
	CALL_TXH(ieee80211_tx_h_fragment);
1481
	/* handlers after fragment must be aware of tx info fragmentation! */
1482 1483
	CALL_TXH(ieee80211_tx_h_stats);
	CALL_TXH(ieee80211_tx_h_encrypt);
1484 1485
	if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
		CALL_TXH(ieee80211_tx_h_calculate_duration);
1486
#undef CALL_TXH
1487

1488
 txh_done:
1489
	if (unlikely(res == TX_DROP)) {
1490
		I802_DEBUG_INC(tx->local->tx_handlers_drop);
1491
		if (tx->skb)
1492
			ieee80211_free_txskb(&tx->local->hw, tx->skb);
1493
		else
1494
			ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs);
1495 1496
		return -1;
	} else if (unlikely(res == TX_QUEUED)) {
1497
		I802_DEBUG_INC(tx->local->tx_handlers_queued);
1498 1499 1500 1501 1502 1503
		return -1;
	}

	return 0;
}

1504 1505 1506 1507 1508 1509 1510
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;
1511
	struct sk_buff *skb2;
1512

1513
	if (ieee80211_tx_prepare(sdata, &tx, NULL, skb) == TX_DROP)
1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529
		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;
	}

1530 1531 1532 1533 1534 1535 1536 1537
	/* 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;
	}

1538 1539 1540 1541
	return true;
}
EXPORT_SYMBOL(ieee80211_tx_prepare_skb);

1542 1543 1544 1545
/*
 * Returns false if the frame couldn't be transmitted but was queued instead.
 */
static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata,
1546 1547
			 struct sta_info *sta, struct sk_buff *skb,
			 bool txpending)
1548
{
J
Johannes Berg 已提交
1549
	struct ieee80211_local *local = sdata->local;
1550
	struct ieee80211_tx_data tx;
1551
	ieee80211_tx_result res_prepare;
1552
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1553
	bool result = true;
1554
	int led_len;
1555 1556 1557

	if (unlikely(skb->len < 10)) {
		dev_kfree_skb(skb);
1558
		return true;
1559 1560
	}

1561
	/* initialises tx */
1562
	led_len = skb->len;
1563
	res_prepare = ieee80211_tx_prepare(sdata, &tx, sta, skb);
1564

1565
	if (unlikely(res_prepare == TX_DROP)) {
1566
		ieee80211_free_txskb(&local->hw, skb);
J
Johannes Berg 已提交
1567
		return true;
1568
	} else if (unlikely(res_prepare == TX_QUEUED)) {
J
Johannes Berg 已提交
1569
		return true;
1570 1571
	}

1572 1573 1574 1575 1576 1577
	/* 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)];

1578
	if (!invoke_tx_handlers(&tx))
1579 1580
		result = __ieee80211_tx(local, &tx.skbs, led_len,
					tx.sta, txpending);
J
Johannes Berg 已提交
1581

1582
	return result;
1583 1584 1585 1586
}

/* device xmit handlers */

1587
static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata,
1588 1589 1590
				struct sk_buff *skb,
				int head_need, bool may_encrypt)
{
1591
	struct ieee80211_local *local = sdata->local;
1592 1593
	int tail_need = 0;

1594
	if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) {
1595 1596 1597 1598 1599
		tail_need = IEEE80211_ENCRYPT_TAILROOM;
		tail_need -= skb_tailroom(skb);
		tail_need = max_t(int, tail_need, 0);
	}

1600 1601 1602
	if (skb_cloned(skb) &&
	    (!(local->hw.flags & IEEE80211_HW_SUPPORTS_CLONED_SKBS) ||
	     !skb_clone_writable(skb, ETH_HLEN) ||
J
Johannes Berg 已提交
1603
	     (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt)))
1604
		I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1605
	else if (head_need || tail_need)
1606
		I802_DEBUG_INC(local->tx_expand_skb_head);
1607 1608
	else
		return 0;
1609 1610

	if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
J
Joe Perches 已提交
1611 1612
		wiphy_debug(local->hw.wiphy,
			    "failed to reallocate TX buffer\n");
1613 1614 1615 1616 1617 1618
		return -ENOMEM;
	}

	return 0;
}

1619 1620
void ieee80211_xmit(struct ieee80211_sub_if_data *sdata,
		    struct sta_info *sta, struct sk_buff *skb)
1621
{
J
Johannes Berg 已提交
1622
	struct ieee80211_local *local = sdata->local;
1623
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1624
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1625
	int headroom;
1626
	bool may_encrypt;
1627

J
Johannes Berg 已提交
1628
	may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT);
1629

J
Johannes Berg 已提交
1630
	headroom = local->tx_headroom;
1631
	if (may_encrypt)
1632
		headroom += sdata->encrypt_headroom;
1633 1634 1635
	headroom -= skb_headroom(skb);
	headroom = max_t(int, 0, headroom);

1636
	if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) {
1637
		ieee80211_free_txskb(&local->hw, skb);
J
Johannes Berg 已提交
1638
		return;
1639 1640
	}

1641
	hdr = (struct ieee80211_hdr *) skb->data;
1642
	info->control.vif = &sdata->vif;
1643

M
Marco Porsch 已提交
1644 1645 1646
	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
1647
			if (mesh_nexthop_resolve(sdata, skb))
M
Marco Porsch 已提交
1648 1649 1650 1651
				return; /* skb queued: don't free */
		} else {
			ieee80211_mps_set_frame_flags(sdata, NULL, hdr);
		}
1652
	}
1653

1654
	ieee80211_set_qos_hdr(sdata, skb);
1655
	ieee80211_tx(sdata, sta, skb, false);
1656 1657
}

1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740
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;
}

1741 1742
netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
					 struct net_device *dev)
1743 1744
{
	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
J
Johannes Berg 已提交
1745
	struct ieee80211_chanctx_conf *chanctx_conf;
1746 1747
	struct ieee80211_radiotap_header *prthdr =
		(struct ieee80211_radiotap_header *)skb->data;
J
Johannes Berg 已提交
1748
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1749
	struct ieee80211_hdr *hdr;
J
Johannes Berg 已提交
1750
	struct ieee80211_sub_if_data *tmp_sdata, *sdata;
1751
	struct cfg80211_chan_def *chandef;
1752
	u16 len_rthdr;
J
Johannes Berg 已提交
1753
	int hdrlen;
1754

1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768
	/* 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 */
1769 1770 1771 1772 1773 1774 1775

	/*
	 * 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
	 */
1776
	skb_set_mac_header(skb, len_rthdr);
1777
	/*
1778 1779
	 * 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
1780
	 */
1781 1782
	skb_set_network_header(skb, len_rthdr);
	skb_set_transport_header(skb, len_rthdr);
1783

J
Johannes Berg 已提交
1784 1785 1786 1787 1788 1789 1790 1791 1792
	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;

1793 1794 1795 1796
	/*
	 * Initialize skb->protocol if the injected frame is a data frame
	 * carrying a rfc1042 header
	 */
J
Johannes Berg 已提交
1797 1798 1799 1800
	if (ieee80211_is_data(hdr->frame_control) &&
	    skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) {
		u8 *payload = (u8 *)hdr + hdrlen;

1801
		if (ether_addr_equal(payload, rfc1042_header))
J
Johannes Berg 已提交
1802 1803
			skb->protocol = cpu_to_be16((payload[6] << 8) |
						    payload[7]);
1804 1805
	}

J
Johannes Berg 已提交
1806 1807
	memset(info, 0, sizeof(*info));

J
Johannes Berg 已提交
1808
	info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
1809 1810 1811 1812 1813
		      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
1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833

	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;
1834
		if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) {
J
Johannes Berg 已提交
1835 1836 1837 1838
			sdata = tmp_sdata;
			break;
		}
	}
1839

J
Johannes Berg 已提交
1840 1841 1842 1843 1844 1845 1846 1847
	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);
	}

1848
	if (chanctx_conf)
1849
		chandef = &chanctx_conf->def;
1850
	else if (!local->use_chanctx)
1851
		chandef = &local->_oper_chandef;
1852 1853
	else
		goto fail_rcu;
J
Johannes Berg 已提交
1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870

	/*
	 * 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.
	 */
1871 1872
	if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef,
				     sdata->vif.type))
J
Johannes Berg 已提交
1873 1874
		goto fail_rcu;

1875
	info->band = chandef->chan->band;
1876
	ieee80211_xmit(sdata, NULL, skb);
J
Johannes Berg 已提交
1877 1878
	rcu_read_unlock();

1879
	return NETDEV_TX_OK;
1880

J
Johannes Berg 已提交
1881 1882
fail_rcu:
	rcu_read_unlock();
1883 1884 1885
fail:
	dev_kfree_skb(skb);
	return NETDEV_TX_OK; /* meaning, we dealt with the skb */
1886 1887
}

1888
static inline bool ieee80211_is_tdls_setup(struct sk_buff *skb)
1889
{
1890
	u16 ethertype = (skb->data[12] << 8) | skb->data[13];
1891

1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970
	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;
1971 1972
}

1973
/**
1974 1975 1976
 * 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
1977
 * @info_flags: skb flags to set
1978
 *
1979 1980 1981 1982 1983 1984 1985
 * 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.
1986
 *
1987 1988 1989
 * The function requires the read-side RCU lock held
 *
 * Returns: the (possibly reallocated) skb or an ERR_PTR() code
1990
 */
1991
static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata,
1992
					   struct sk_buff *skb, u32 info_flags,
1993
					   struct sta_info *sta)
1994
{
1995
	struct ieee80211_local *local = sdata->local;
1996
	struct ieee80211_tx_info *info;
1997
	int head_need;
1998 1999
	u16 ethertype, hdrlen,  meshhdrlen = 0;
	__le16 fc;
2000
	struct ieee80211_hdr hdr;
2001
	struct ieee80211s_hdr mesh_hdr __maybe_unused;
2002
	struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL;
2003 2004
	const u8 *encaps_data;
	int encaps_len, skip_header_bytes;
2005
	int nh_pos, h_pos;
2006 2007
	bool wme_sta = false, authorized = false;
	bool tdls_peer;
J
Johannes Berg 已提交
2008 2009
	bool multicast;
	u16 info_id = 0;
J
Johannes Berg 已提交
2010 2011 2012
	struct ieee80211_chanctx_conf *chanctx_conf;
	struct ieee80211_sub_if_data *ap_sdata;
	enum ieee80211_band band;
2013
	int ret;
2014

2015 2016 2017
	if (IS_ERR(sta))
		sta = NULL;

2018 2019 2020
	/* convert Ethernet header to proper 802.11 header (based on
	 * operation mode) */
	ethertype = (skb->data[12] << 8) | skb->data[13];
2021
	fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
2022

2023
	switch (sdata->vif.type) {
2024
	case NL80211_IFTYPE_AP_VLAN:
2025
		if (sdata->wdev.use_4addr) {
2026 2027 2028
			fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
			/* RA TA DA SA */
			memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN);
2029
			memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2030 2031 2032
			memcpy(hdr.addr3, skb->data, ETH_ALEN);
			memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
			hdrlen = 30;
J
Johannes Berg 已提交
2033
			authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
2034
			wme_sta = sta->sta.wme;
2035
		}
J
Johannes Berg 已提交
2036 2037 2038
		ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
					u.ap);
		chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf);
2039 2040 2041 2042
		if (!chanctx_conf) {
			ret = -ENOTCONN;
			goto free;
		}
2043
		band = chanctx_conf->def.chan->band;
2044
		if (sdata->wdev.use_4addr)
2045 2046 2047
			break;
		/* fall through */
	case NL80211_IFTYPE_AP:
A
Arnd Bergmann 已提交
2048 2049
		if (sdata->vif.type == NL80211_IFTYPE_AP)
			chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2050 2051 2052 2053
		if (!chanctx_conf) {
			ret = -ENOTCONN;
			goto free;
		}
2054
		fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
2055 2056
		/* DA BSSID SA */
		memcpy(hdr.addr1, skb->data, ETH_ALEN);
2057
		memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2058 2059
		memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
		hdrlen = 24;
2060
		band = chanctx_conf->def.chan->band;
2061
		break;
2062
	case NL80211_IFTYPE_WDS:
2063
		fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
2064 2065
		/* RA TA DA SA */
		memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
2066
		memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2067 2068 2069
		memcpy(hdr.addr3, skb->data, ETH_ALEN);
		memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
		hdrlen = 30;
J
Johannes Berg 已提交
2070 2071 2072 2073
		/*
		 * This is the exception! WDS style interfaces are prohibited
		 * when channel contexts are in used so this must be valid
		 */
2074
		band = local->hw.conf.chandef.chan->band;
2075
		break;
2076
#ifdef CONFIG_MAC80211_MESH
2077
	case NL80211_IFTYPE_MESH_POINT:
2078
		if (!is_multicast_ether_addr(skb->data)) {
2079 2080 2081
			struct sta_info *next_hop;
			bool mpp_lookup = true;

J
Johannes Berg 已提交
2082
			mpath = mesh_path_lookup(sdata, skb->data);
2083 2084 2085 2086 2087 2088 2089 2090 2091 2092
			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
2093
				mppath = mpp_path_lookup(sdata, skb->data);
2094 2095 2096

			if (mppath && mpath)
				mesh_path_del(mpath->sdata, mpath->dst);
2097
		}
2098

2099
		/*
2100 2101 2102 2103
		 * 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)
2104
		 */
2105 2106
		if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) &&
		    !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) {
2107 2108
			hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
					skb->data, skb->data + ETH_ALEN);
J
Johannes Berg 已提交
2109 2110
			meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr,
							       NULL, NULL);
2111
		} else {
2112 2113 2114 2115 2116 2117 2118 2119 2120 2121 2122 2123
			/* 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;
2124

2125
			hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
2126
					mesh_da, sdata->vif.addr);
2127 2128
			if (is_multicast_ether_addr(mesh_da))
				/* DA TA mSA AE:SA */
J
Johannes Berg 已提交
2129 2130 2131
				meshhdrlen = ieee80211_new_mesh_header(
						sdata, &mesh_hdr,
						skb->data + ETH_ALEN, NULL);
2132
			else
2133
				/* RA TA mDA mSA AE:DA SA */
J
Johannes Berg 已提交
2134 2135 2136
				meshhdrlen = ieee80211_new_mesh_header(
						sdata, &mesh_hdr, skb->data,
						skb->data + ETH_ALEN);
2137 2138

		}
J
Johannes Berg 已提交
2139
		chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2140 2141 2142 2143
		if (!chanctx_conf) {
			ret = -ENOTCONN;
			goto free;
		}
2144
		band = chanctx_conf->def.chan->band;
2145 2146
		break;
#endif
2147
	case NL80211_IFTYPE_STATION:
2148 2149
		/* we already did checks when looking up the RA STA */
		tdls_peer = test_sta_flag(sta, WLAN_STA_TDLS_PEER);
2150

2151
		if (tdls_peer) {
2152 2153 2154 2155 2156 2157 2158 2159 2160
			/* 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);
2161
			/* RA TA DA SA */
2162
			memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
2163
			memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2164 2165 2166 2167 2168 2169
			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 */
2170
			memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
2171 2172 2173 2174
			memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
			memcpy(hdr.addr3, skb->data, ETH_ALEN);
			hdrlen = 24;
		}
J
Johannes Berg 已提交
2175
		chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2176 2177 2178 2179
		if (!chanctx_conf) {
			ret = -ENOTCONN;
			goto free;
		}
2180
		band = chanctx_conf->def.chan->band;
2181
		break;
2182 2183 2184 2185 2186 2187 2188
	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);
2189 2190 2191 2192
		if (!chanctx_conf) {
			ret = -ENOTCONN;
			goto free;
		}
2193 2194
		band = chanctx_conf->def.chan->band;
		break;
2195
	case NL80211_IFTYPE_ADHOC:
2196 2197 2198
		/* DA SA BSSID */
		memcpy(hdr.addr1, skb->data, ETH_ALEN);
		memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2199
		memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN);
2200
		hdrlen = 24;
J
Johannes Berg 已提交
2201
		chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2202 2203 2204 2205
		if (!chanctx_conf) {
			ret = -ENOTCONN;
			goto free;
		}
2206
		band = chanctx_conf->def.chan->band;
2207 2208
		break;
	default:
2209 2210
		ret = -EINVAL;
		goto free;
2211 2212
	}

J
Johannes Berg 已提交
2213
	multicast = is_multicast_ether_addr(hdr.addr1);
2214

2215 2216 2217 2218 2219 2220
	/* 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
2221
		wme_sta = true;
2222
	}
2223

2224 2225
	/* receiver does QoS (which also means we do) use it */
	if (wme_sta) {
2226
		fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
2227 2228 2229 2230
		hdrlen += 2;
	}

	/*
2231 2232
	 * Drop unicast frames to unauthorised stations unless they are
	 * EAPOL frames from the local station.
2233
	 */
2234
	if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) &&
2235
		     (sdata->vif.type != NL80211_IFTYPE_OCB) &&
2236
		     !multicast && !authorized &&
2237
		     (cpu_to_be16(ethertype) != sdata->control_port_protocol ||
2238
		      !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) {
2239
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
J
Johannes Berg 已提交
2240
		net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n",
2241
				    sdata->name, hdr.addr1);
2242 2243 2244 2245
#endif

		I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);

2246 2247
		ret = -EPERM;
		goto free;
2248 2249
	}

J
Johannes Berg 已提交
2250 2251
	if (unlikely(!multicast && skb->sk &&
		     skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) {
2252
		struct sk_buff *ack_skb = skb_clone_sk(skb);
J
Johannes Berg 已提交
2253

2254
		if (ack_skb) {
J
Johannes Berg 已提交
2255
			unsigned long flags;
T
Tejun Heo 已提交
2256
			int id;
J
Johannes Berg 已提交
2257 2258

			spin_lock_irqsave(&local->ack_status_lock, flags);
2259
			id = idr_alloc(&local->ack_status_frames, ack_skb,
T
Tejun Heo 已提交
2260
				       1, 0x10000, GFP_ATOMIC);
J
Johannes Berg 已提交
2261 2262
			spin_unlock_irqrestore(&local->ack_status_lock, flags);

T
Tejun Heo 已提交
2263
			if (id >= 0) {
J
Johannes Berg 已提交
2264 2265 2266
				info_id = id;
				info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
			} else {
2267
				kfree_skb(ack_skb);
J
Johannes Berg 已提交
2268 2269 2270 2271
			}
		}
	}

2272 2273 2274 2275
	/*
	 * If the skb is shared we need to obtain our own copy.
	 */
	if (skb_shared(skb)) {
J
Johannes Berg 已提交
2276 2277 2278 2279 2280
		struct sk_buff *tmp_skb = skb;

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

2281
		skb = skb_clone(skb, GFP_ATOMIC);
2282 2283
		kfree_skb(tmp_skb);

2284 2285 2286 2287
		if (!skb) {
			ret = -ENOMEM;
			goto free;
		}
2288 2289
	}

2290
	hdr.frame_control = fc;
2291 2292 2293 2294 2295 2296 2297 2298
	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
2299
	} else if (ethertype >= ETH_P_802_3_MIN) {
2300 2301 2302 2303 2304 2305 2306 2307
		encaps_data = rfc1042_header;
		encaps_len = sizeof(rfc1042_header);
		skip_header_bytes -= 2;
	} else {
		encaps_data = NULL;
		encaps_len = 0;
	}

2308 2309 2310
	nh_pos = skb_network_header(skb) - skb->data;
	h_pos = skb_transport_header(skb) - skb->data;

2311 2312 2313 2314
	skb_pull(skb, skip_header_bytes);
	nh_pos -= skip_header_bytes;
	h_pos -= skip_header_bytes;

2315
	head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
2316

2317 2318 2319 2320 2321 2322 2323 2324 2325 2326 2327
	/*
	 * 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.
	 */
2328

2329
	if (head_need > 0 || skb_cloned(skb)) {
2330
		head_need += sdata->encrypt_headroom;
2331 2332
		head_need += local->tx_headroom;
		head_need = max_t(int, 0, head_need);
2333 2334
		if (ieee80211_skb_resize(sdata, skb, head_need, true)) {
			ieee80211_free_txskb(&local->hw, skb);
J
Johannes Berg 已提交
2335
			skb = NULL;
2336
			return ERR_PTR(-ENOMEM);
2337
		}
2338 2339 2340 2341 2342 2343 2344
	}

	if (encaps_data) {
		memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
		nh_pos += encaps_len;
		h_pos += encaps_len;
	}
2345

2346
#ifdef CONFIG_MAC80211_MESH
2347 2348 2349 2350 2351
	if (meshhdrlen > 0) {
		memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
		nh_pos += meshhdrlen;
		h_pos += meshhdrlen;
	}
2352
#endif
2353

2354
	if (ieee80211_is_data_qos(fc)) {
2355 2356
		__le16 *qos_control;

W
Weilong Chen 已提交
2357
		qos_control = (__le16 *) skb_push(skb, 2);
2358 2359 2360 2361 2362 2363 2364 2365 2366
		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);

2367 2368 2369 2370 2371 2372 2373 2374 2375 2376
	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);

2377
	info = IEEE80211_SKB_CB(skb);
J
Johannes Berg 已提交
2378 2379
	memset(info, 0, sizeof(*info));

J
Johannes Berg 已提交
2380 2381
	info->flags = info_flags;
	info->ack_frame_id = info_id;
2382
	info->band = band;
J
Johannes Berg 已提交
2383

2384 2385 2386 2387 2388 2389
	return skb;
 free:
	kfree_skb(skb);
	return ERR_PTR(ret);
}

J
Johannes Berg 已提交
2390 2391 2392 2393 2394 2395 2396 2397 2398 2399 2400 2401 2402 2403 2404 2405 2406 2407 2408 2409 2410 2411 2412 2413 2414 2415 2416 2417 2418 2419 2420 2421 2422 2423 2424 2425 2426 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 2462 2463 2464 2465 2466 2467 2468 2469 2470 2471 2472 2473 2474 2475 2476 2477 2478 2479 2480 2481 2482 2483 2484 2485 2486 2487 2488 2489 2490 2491 2492 2493 2494 2495 2496 2497 2498 2499 2500 2501 2502 2503 2504 2505 2506 2507 2508 2509 2510 2511 2512 2513 2514 2515 2516 2517 2518 2519 2520 2521 2522 2523 2524 2525 2526 2527 2528 2529 2530 2531 2532 2533 2534 2535 2536 2537 2538 2539 2540 2541 2542 2543 2544 2545 2546 2547 2548 2549 2550 2551 2552 2553 2554 2555 2556 2557 2558 2559 2560 2561 2562 2563 2564 2565 2566 2567 2568 2569 2570 2571 2572 2573 2574 2575 2576 2577 2578 2579 2580 2581 2582 2583 2584 2585 2586 2587 2588 2589 2590 2591 2592 2593 2594 2595 2596 2597 2598 2599 2600 2601 2602 2603 2604 2605 2606 2607 2608 2609 2610 2611 2612 2613 2614 2615 2616 2617 2618 2619 2620 2621 2622 2623 2624 2625 2626 2627 2628 2629 2630 2631 2632 2633 2634 2635 2636 2637 2638 2639 2640 2641 2642 2643 2644 2645 2646 2647 2648 2649 2650 2651 2652 2653 2654 2655 2656 2657 2658 2659 2660 2661 2662 2663 2664 2665 2666 2667 2668 2669 2670 2671 2672 2673 2674 2675 2676 2677 2678 2679 2680 2681 2682 2683 2684 2685 2686 2687 2688 2689 2690 2691 2692 2693 2694 2695 2696 2697 2698 2699 2700 2701 2702 2703 2704 2705 2706 2707 2708 2709 2710 2711 2712 2713 2714 2715 2716 2717 2718 2719 2720 2721 2722 2723 2724 2725 2726 2727 2728 2729 2730 2731 2732 2733 2734 2735 2736 2737 2738 2739 2740 2741 2742 2743 2744 2745 2746 2747 2748 2749 2750 2751 2752 2753 2754 2755 2756 2757 2758 2759 2760 2761 2762 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
/*
 * 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 */
	if (local->hw.wiphy->frag_threshold != (u32)-1)
		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) {
	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) {
		bool gen_iv, iv_spc;

		gen_iv = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV;
		iv_spc = build.key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE;

		/* 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;
		default:
			/* don't do fast-xmit for these ciphers (yet) */
			goto out;
		}

		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;
	}

	dev->stats.tx_packets++;
	dev->stats.tx_bytes += skb->len + extra_head;
	dev->trans_start = jiffies;

	/* 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_fragments++;
	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;
}

2798 2799 2800 2801 2802
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);
2803
	struct sta_info *sta;
2804 2805 2806 2807 2808 2809 2810

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

	rcu_read_lock();
2811

2812 2813 2814 2815
	if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) {
		kfree_skb(skb);
		goto out;
	}
2816

J
Johannes Berg 已提交
2817 2818 2819 2820 2821 2822 2823 2824 2825 2826
	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;
	}

2827
	skb = ieee80211_build_hdr(sdata, skb, info_flags, sta);
2828 2829 2830 2831 2832 2833
	if (IS_ERR(skb))
		goto out;

	dev->stats.tx_packets++;
	dev->stats.tx_bytes += skb->len;
	dev->trans_start = jiffies;
2834

2835
	ieee80211_xmit(sdata, sta, skb);
2836
 out:
J
Johannes Berg 已提交
2837
	rcu_read_unlock();
2838 2839
}

2840 2841 2842 2843 2844 2845 2846
/**
 * 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.
 */
2847 2848 2849 2850 2851 2852
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;
}
2853

2854 2855 2856 2857 2858 2859 2860 2861 2862
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,
	};
2863
	struct sta_info *sta;
2864 2865 2866

	rcu_read_lock();

2867 2868 2869 2870 2871 2872 2873
	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);
2874 2875 2876 2877 2878 2879 2880 2881 2882 2883 2884 2885 2886 2887 2888 2889 2890 2891
	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;
}

2892 2893 2894 2895
/*
 * ieee80211_clear_tx_pending may not be called in a context where
 * it is possible that it packets could come in again.
 */
2896 2897
void ieee80211_clear_tx_pending(struct ieee80211_local *local)
{
2898
	struct sk_buff *skb;
J
Johannes Berg 已提交
2899
	int i;
2900

2901 2902 2903 2904
	for (i = 0; i < local->hw.queues; i++) {
		while ((skb = skb_dequeue(&local->pending[i])) != NULL)
			ieee80211_free_txskb(&local->hw, skb);
	}
2905 2906
}

2907 2908 2909 2910 2911
/*
 * 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.
 */
2912 2913 2914 2915 2916 2917 2918
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;
2919
	bool result;
J
Johannes Berg 已提交
2920
	struct ieee80211_chanctx_conf *chanctx_conf;
2921

2922
	sdata = vif_to_sdata(info->control.vif);
2923 2924

	if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) {
J
Johannes Berg 已提交
2925 2926 2927 2928 2929
		chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
		if (unlikely(!chanctx_conf)) {
			dev_kfree_skb(skb);
			return true;
		}
2930
		info->band = chanctx_conf->def.chan->band;
2931
		result = ieee80211_tx(sdata, NULL, skb, true);
2932
	} else {
2933 2934 2935 2936 2937
		struct sk_buff_head skbs;

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

2938
		hdr = (struct ieee80211_hdr *)skb->data;
2939
		sta = sta_info_get(sdata, hdr->addr1);
2940

2941
		result = __ieee80211_tx(local, &skbs, skb->len, sta, true);
2942 2943 2944 2945 2946
	}

	return result;
}

2947
/*
J
Johannes Berg 已提交
2948
 * Transmit all pending packets. Called from tasklet.
2949
 */
2950 2951 2952
void ieee80211_tx_pending(unsigned long data)
{
	struct ieee80211_local *local = (struct ieee80211_local *)data;
2953
	unsigned long flags;
2954
	int i;
J
Johannes Berg 已提交
2955
	bool txok;
2956

2957
	rcu_read_lock();
2958

J
Johannes Berg 已提交
2959
	spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
2960 2961 2962 2963 2964
	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
2965
		if (local->queue_stop_reasons[i] ||
2966
		    skb_queue_empty(&local->pending[i]))
2967
			continue;
2968

2969
		while (!skb_queue_empty(&local->pending[i])) {
J
Johannes Berg 已提交
2970
			struct sk_buff *skb = __skb_dequeue(&local->pending[i]);
2971 2972
			struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);

2973
			if (WARN_ON(!info->control.vif)) {
2974
				ieee80211_free_txskb(&local->hw, skb);
2975 2976 2977
				continue;
			}

J
Johannes Berg 已提交
2978 2979 2980 2981 2982 2983 2984
			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)
2985
				break;
2986
		}
2987 2988

		if (skb_queue_empty(&local->pending[i]))
2989
			ieee80211_propagate_queue_wake(local, i);
2990
	}
J
Johannes Berg 已提交
2991
	spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
2992

2993
	rcu_read_unlock();
2994 2995 2996 2997
}

/* functions for drivers to get certain frames */

2998
static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
2999 3000
				       struct ps_data *ps, struct sk_buff *skb,
				       bool is_template)
3001 3002 3003 3004 3005 3006 3007
{
	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. */
3008
	if (atomic_read(&ps->num_sta_ps) > 0)
3009 3010
		/* in the hope that this is faster than
		 * checking byte-for-byte */
W
Weilong Chen 已提交
3011
		have_bits = !bitmap_empty((unsigned long *)ps->tim,
3012
					  IEEE80211_MAX_AID+1);
3013 3014 3015 3016 3017 3018
	if (!is_template) {
		if (ps->dtim_count == 0)
			ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1;
		else
			ps->dtim_count--;
	}
3019 3020 3021 3022

	tim = pos = (u8 *) skb_put(skb, 6);
	*pos++ = WLAN_EID_TIM;
	*pos++ = 4;
3023
	*pos++ = ps->dtim_count;
3024
	*pos++ = sdata->vif.bss_conf.dtim_period;
3025

3026
	if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf))
3027 3028
		aid0 = 1;

3029
	ps->dtim_bc_mc = aid0 == 1;
3030

3031 3032 3033 3034 3035 3036
	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++) {
3037
			if (ps->tim[i]) {
3038 3039 3040 3041 3042 3043
				n1 = i & 0xfe;
				break;
			}
		}
		n2 = n1;
		for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
3044
			if (ps->tim[i]) {
3045 3046 3047 3048 3049 3050 3051 3052
				n2 = i;
				break;
			}
		}

		/* Bitmap control */
		*pos++ = n1 | aid0;
		/* Part Virt Bitmap */
3053
		skb_put(skb, n2 - n1);
3054
		memcpy(pos, ps->tim + n1, n2 - n1 + 1);
3055 3056 3057 3058 3059 3060 3061 3062

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

3063
static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
3064 3065
				    struct ps_data *ps, struct sk_buff *skb,
				    bool is_template)
3066 3067 3068 3069 3070 3071 3072 3073 3074 3075 3076
{
	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) {
3077
		__ieee80211_beacon_add_tim(sdata, ps, skb, is_template);
3078
	} else {
J
Johannes Berg 已提交
3079
		spin_lock_bh(&local->tim_lock);
3080
		__ieee80211_beacon_add_tim(sdata, ps, skb, is_template);
J
Johannes Berg 已提交
3081
		spin_unlock_bh(&local->tim_lock);
3082 3083 3084 3085 3086
	}

	return 0;
}

3087 3088
static void ieee80211_set_csa(struct ieee80211_sub_if_data *sdata,
			      struct beacon_data *beacon)
3089 3090
{
	struct probe_resp *resp;
3091 3092
	u8 *beacon_data;
	size_t beacon_data_len;
3093
	int i;
3094
	u8 count = beacon->csa_current_counter;
3095 3096 3097 3098 3099 3100 3101 3102 3103 3104

	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;
3105 3106 3107 3108
	case NL80211_IFTYPE_MESH_POINT:
		beacon_data = beacon->head;
		beacon_data_len = beacon->head_len;
		break;
3109 3110 3111
	default:
		return;
	}
3112

3113
	rcu_read_lock();
3114
	for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; ++i) {
3115
		resp = rcu_dereference(sdata->u.ap.probe_resp);
3116

3117 3118 3119
		if (beacon->csa_counter_offsets[i]) {
			if (WARN_ON_ONCE(beacon->csa_counter_offsets[i] >=
					 beacon_data_len)) {
3120 3121 3122
				rcu_read_unlock();
				return;
			}
3123 3124

			beacon_data[beacon->csa_counter_offsets[i]] = count;
3125
		}
3126 3127 3128

		if (sdata->vif.type == NL80211_IFTYPE_AP && resp)
			resp->data[resp->csa_counter_offsets[i]] = count;
3129
	}
3130
	rcu_read_unlock();
3131 3132 3133 3134 3135
}

u8 ieee80211_csa_update_counter(struct ieee80211_vif *vif)
{
	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
3136 3137
	struct beacon_data *beacon = NULL;
	u8 count = 0;
3138

3139 3140 3141 3142 3143 3144 3145 3146 3147 3148 3149 3150 3151
	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--;
3152 3153

	/* the counter should never reach 0 */
3154 3155
	WARN_ON_ONCE(!beacon->csa_current_counter);
	count = beacon->csa_current_counter;
3156

3157 3158 3159
unlock:
	rcu_read_unlock();
	return count;
3160
}
3161
EXPORT_SYMBOL(ieee80211_csa_update_counter);
3162 3163 3164 3165 3166 3167 3168 3169 3170 3171 3172 3173 3174 3175 3176 3177 3178 3179 3180 3181 3182

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;
3183 3184 3185 3186 3187 3188 3189
	} else if (vif->type == NL80211_IFTYPE_ADHOC) {
		struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;

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

3190 3191 3192 3193 3194 3195 3196 3197 3198
		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;

3199 3200
		beacon_data = beacon->head;
		beacon_data_len = beacon->head_len;
3201 3202 3203 3204 3205
	} else {
		WARN_ON(1);
		goto out;
	}

3206 3207 3208
	if (!beacon->csa_counter_offsets[0])
		goto out;

3209
	if (WARN_ON_ONCE(beacon->csa_counter_offsets[0] > beacon_data_len))
3210 3211
		goto out;

3212
	if (beacon_data[beacon->csa_counter_offsets[0]] == 1)
3213 3214 3215 3216 3217 3218 3219 3220
		ret = true;
 out:
	rcu_read_unlock();

	return ret;
}
EXPORT_SYMBOL(ieee80211_csa_is_complete);

3221 3222 3223 3224 3225
static struct sk_buff *
__ieee80211_beacon_get(struct ieee80211_hw *hw,
		       struct ieee80211_vif *vif,
		       struct ieee80211_mutable_offsets *offs,
		       bool is_template)
3226 3227
{
	struct ieee80211_local *local = hw_to_local(hw);
3228
	struct beacon_data *beacon = NULL;
3229
	struct sk_buff *skb = NULL;
3230
	struct ieee80211_tx_info *info;
3231
	struct ieee80211_sub_if_data *sdata = NULL;
J
Johannes Berg 已提交
3232
	enum ieee80211_band band;
3233
	struct ieee80211_tx_rate_control txrc;
J
Johannes Berg 已提交
3234
	struct ieee80211_chanctx_conf *chanctx_conf;
3235
	int csa_off_base = 0;
3236

3237
	rcu_read_lock();
3238

3239
	sdata = vif_to_sdata(vif);
J
Johannes Berg 已提交
3240
	chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3241

J
Johannes Berg 已提交
3242
	if (!ieee80211_sdata_running(sdata) || !chanctx_conf)
3243 3244
		goto out;

3245 3246
	if (offs)
		memset(offs, 0, sizeof(*offs));
3247

3248
	if (sdata->vif.type == NL80211_IFTYPE_AP) {
3249 3250
		struct ieee80211_if_ap *ap = &sdata->u.ap;

3251
		beacon = rcu_dereference(ap->beacon);
D
Dan Carpenter 已提交
3252
		if (beacon) {
3253
			if (beacon->csa_counter_offsets[0]) {
3254 3255 3256 3257 3258
				if (!is_template)
					ieee80211_csa_update_counter(vif);

				ieee80211_set_csa(sdata, beacon);
			}
3259

J
Johannes Berg 已提交
3260 3261 3262 3263 3264 3265
			/*
			 * headroom, head length,
			 * tail length and maximum TIM length
			 */
			skb = dev_alloc_skb(local->tx_headroom +
					    beacon->head_len +
3266 3267
					    beacon->tail_len + 256 +
					    local->hw.extra_beacon_tailroom);
J
Johannes Berg 已提交
3268 3269
			if (!skb)
				goto out;
3270

J
Johannes Berg 已提交
3271 3272 3273
			skb_reserve(skb, local->tx_headroom);
			memcpy(skb_put(skb, beacon->head_len), beacon->head,
			       beacon->head_len);
3274

3275 3276
			ieee80211_beacon_add_tim(sdata, &ap->ps, skb,
						 is_template);
3277

3278 3279 3280
			if (offs) {
				offs->tim_offset = beacon->head_len;
				offs->tim_length = skb->len - beacon->head_len;
3281 3282 3283

				/* for AP the csa offsets are from tail */
				csa_off_base = skb->len;
3284
			}
3285

J
Johannes Berg 已提交
3286 3287 3288
			if (beacon->tail)
				memcpy(skb_put(skb, beacon->tail_len),
				       beacon->tail, beacon->tail_len);
3289 3290
		} else
			goto out;
3291
	} else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
3292
		struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
3293
		struct ieee80211_hdr *hdr;
3294

3295 3296
		beacon = rcu_dereference(ifibss->presp);
		if (!beacon)
3297 3298
			goto out;

3299
		if (beacon->csa_counter_offsets[0]) {
3300 3301
			if (!is_template)
				ieee80211_csa_update_counter(vif);
3302

3303
			ieee80211_set_csa(sdata, beacon);
3304
		}
3305

3306
		skb = dev_alloc_skb(local->tx_headroom + beacon->head_len +
3307
				    local->hw.extra_beacon_tailroom);
3308 3309
		if (!skb)
			goto out;
3310
		skb_reserve(skb, local->tx_headroom);
3311 3312
		memcpy(skb_put(skb, beacon->head_len), beacon->head,
		       beacon->head_len);
3313 3314

		hdr = (struct ieee80211_hdr *) skb->data;
3315 3316
		hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
						 IEEE80211_STYPE_BEACON);
J
Johannes Berg 已提交
3317
	} else if (ieee80211_vif_is_mesh(&sdata->vif)) {
3318
		struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
3319

3320 3321
		beacon = rcu_dereference(ifmsh->beacon);
		if (!beacon)
3322 3323
			goto out;

3324
		if (beacon->csa_counter_offsets[0]) {
3325 3326 3327 3328 3329 3330 3331 3332
			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);

3333
			ieee80211_set_csa(sdata, beacon);
3334
		}
3335

3336
		if (ifmsh->sync_ops)
3337
			ifmsh->sync_ops->adjust_tbtt(sdata, beacon);
3338

3339
		skb = dev_alloc_skb(local->tx_headroom +
3340
				    beacon->head_len +
M
Marco Porsch 已提交
3341
				    256 + /* TIM IE */
3342
				    beacon->tail_len +
3343
				    local->hw.extra_beacon_tailroom);
J
Johannes Berg 已提交
3344 3345
		if (!skb)
			goto out;
T
Thomas Pedersen 已提交
3346
		skb_reserve(skb, local->tx_headroom);
3347 3348
		memcpy(skb_put(skb, beacon->head_len), beacon->head,
		       beacon->head_len);
3349 3350 3351
		ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb, is_template);

		if (offs) {
3352 3353
			offs->tim_offset = beacon->head_len;
			offs->tim_length = skb->len - beacon->head_len;
3354 3355
		}

3356 3357
		memcpy(skb_put(skb, beacon->tail_len), beacon->tail,
		       beacon->tail_len);
3358 3359
	} else {
		WARN_ON(1);
3360
		goto out;
3361 3362
	}

3363
	/* CSA offsets */
3364
	if (offs && beacon) {
3365 3366 3367
		int i;

		for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; i++) {
3368
			u16 csa_off = beacon->csa_counter_offsets[i];
3369 3370 3371 3372 3373 3374 3375 3376

			if (!csa_off)
				continue;

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

3377
	band = chanctx_conf->def.chan->band;
J
Johannes Berg 已提交
3378

3379 3380
	info = IEEE80211_SKB_CB(skb);

J
Johannes Berg 已提交
3381
	info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
3382
	info->flags |= IEEE80211_TX_CTL_NO_ACK;
3383
	info->band = band;
3384 3385 3386

	memset(&txrc, 0, sizeof(txrc));
	txrc.hw = hw;
3387
	txrc.sband = local->hw.wiphy->bands[band];
3388 3389 3390
	txrc.bss_conf = &sdata->vif.bss_conf;
	txrc.skb = skb;
	txrc.reported_rate.idx = -1;
3391
	txrc.rate_idx_mask = sdata->rc_rateidx_mask[band];
3392
	if (txrc.rate_idx_mask == (1 << txrc.sband->n_bitrates) - 1)
3393 3394 3395
		txrc.max_rate_idx = -1;
	else
		txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
3396
	txrc.bss = true;
3397
	rate_control_get_rate(sdata, NULL, &txrc);
3398 3399

	info->control.vif = vif;
3400

3401 3402 3403
	info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT |
			IEEE80211_TX_CTL_ASSIGN_SEQ |
			IEEE80211_TX_CTL_FIRST_FRAGMENT;
3404
 out:
3405
	rcu_read_unlock();
3406
	return skb;
3407 3408 3409 3410 3411 3412 3413 3414 3415 3416 3417 3418 3419 3420 3421 3422 3423 3424 3425 3426 3427 3428 3429 3430 3431 3432

}

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;
3433
}
3434
EXPORT_SYMBOL(ieee80211_beacon_get_tim);
3435

3436 3437 3438 3439
struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw,
					struct ieee80211_vif *vif)
{
	struct ieee80211_if_ap *ap = NULL;
3440 3441
	struct sk_buff *skb = NULL;
	struct probe_resp *presp = NULL;
3442 3443 3444 3445 3446 3447 3448 3449 3450 3451 3452 3453 3454
	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;

3455
	skb = dev_alloc_skb(presp->len);
3456 3457 3458
	if (!skb)
		goto out;

3459 3460
	memcpy(skb_put(skb, presp->len), presp->data, presp->len);

3461 3462 3463 3464 3465 3466 3467 3468 3469
	hdr = (struct ieee80211_hdr *) skb->data;
	memset(hdr->addr1, 0, sizeof(hdr->addr1));

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

3470 3471 3472 3473 3474 3475 3476 3477 3478 3479 3480 3481 3482 3483 3484 3485 3486
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));
3487
	if (!skb)
3488
		return NULL;
3489

3490 3491 3492 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 3519 3520 3521 3522 3523 3524
	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));
3525
	if (!skb)
3526
		return NULL;
3527

3528 3529 3530 3531 3532 3533 3534 3535 3536 3537 3538 3539 3540 3541 3542 3543
	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);

3544
struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw,
3545
				       const u8 *src_addr,
3546
				       const u8 *ssid, size_t ssid_len,
3547
				       size_t tailroom)
3548
{
3549
	struct ieee80211_local *local = hw_to_local(hw);
3550 3551 3552 3553 3554 3555 3556 3557
	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) +
3558
			    ie_ssid_len + tailroom);
3559
	if (!skb)
3560 3561 3562 3563 3564 3565 3566 3567
		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
3568
	eth_broadcast_addr(hdr->addr1);
3569
	memcpy(hdr->addr2, src_addr, ETH_ALEN);
J
Johannes Berg 已提交
3570
	eth_broadcast_addr(hdr->addr3);
3571 3572 3573 3574

	pos = skb_put(skb, ie_ssid_len);
	*pos++ = WLAN_EID_SSID;
	*pos++ = ssid_len;
3575
	if (ssid_len)
3576 3577 3578 3579 3580 3581 3582
		memcpy(pos, ssid, ssid_len);
	pos += ssid_len;

	return skb;
}
EXPORT_SYMBOL(ieee80211_probereq_get);

3583
void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
3584
		       const void *frame, size_t frame_len,
3585
		       const struct ieee80211_tx_info *frame_txctl,
3586 3587 3588 3589
		       struct ieee80211_rts *rts)
{
	const struct ieee80211_hdr *hdr = frame;

3590 3591
	rts->frame_control =
	    cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
3592 3593
	rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
					       frame_txctl);
3594 3595 3596 3597 3598
	memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
	memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
}
EXPORT_SYMBOL(ieee80211_rts_get);

3599
void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
3600
			     const void *frame, size_t frame_len,
3601
			     const struct ieee80211_tx_info *frame_txctl,
3602 3603 3604 3605
			     struct ieee80211_cts *cts)
{
	const struct ieee80211_hdr *hdr = frame;

3606 3607
	cts->frame_control =
	    cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
3608 3609
	cts->duration = ieee80211_ctstoself_duration(hw, vif,
						     frame_len, frame_txctl);
3610 3611 3612 3613 3614
	memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
}
EXPORT_SYMBOL(ieee80211_ctstoself_get);

struct sk_buff *
3615
ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
3616
			  struct ieee80211_vif *vif)
3617 3618
{
	struct ieee80211_local *local = hw_to_local(hw);
3619
	struct sk_buff *skb = NULL;
3620
	struct ieee80211_tx_data tx;
3621
	struct ieee80211_sub_if_data *sdata;
3622
	struct ps_data *ps;
3623
	struct ieee80211_tx_info *info;
J
Johannes Berg 已提交
3624
	struct ieee80211_chanctx_conf *chanctx_conf;
3625

3626
	sdata = vif_to_sdata(vif);
3627 3628

	rcu_read_lock();
J
Johannes Berg 已提交
3629
	chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3630

3631 3632 3633 3634 3635 3636 3637 3638 3639 3640 3641
	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
3642 3643
	} else if (ieee80211_vif_is_mesh(&sdata->vif)) {
		ps = &sdata->u.mesh.ps;
3644
	} else {
3645
		goto out;
3646
	}
3647

3648
	if (ps->dtim_count != 0 || !ps->dtim_bc_mc)
3649
		goto out; /* send buffered bc/mc only after DTIM beacon */
3650

3651
	while (1) {
3652
		skb = skb_dequeue(&ps->bc_buf);
3653
		if (!skb)
3654
			goto out;
3655 3656
		local->total_ps_buffered--;

3657
		if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) {
3658 3659 3660 3661 3662 3663 3664 3665 3666
			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);
		}

3667
		if (sdata->vif.type == NL80211_IFTYPE_AP)
3668
			sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev);
3669
		if (!ieee80211_tx_prepare(sdata, &tx, NULL, skb))
3670 3671 3672
			break;
		dev_kfree_skb_any(skb);
	}
3673 3674 3675

	info = IEEE80211_SKB_CB(skb);

3676
	tx.flags |= IEEE80211_TX_PS_BUFFERED;
3677
	info->band = chanctx_conf->def.chan->band;
3678

3679
	if (invoke_tx_handlers(&tx))
3680
		skb = NULL;
3681
 out:
3682
	rcu_read_unlock();
3683 3684 3685 3686

	return skb;
}
EXPORT_SYMBOL(ieee80211_get_buffered_bc);
J
Johannes Berg 已提交
3687

3688 3689 3690 3691 3692 3693 3694 3695 3696 3697 3698 3699 3700 3701 3702 3703 3704 3705 3706 3707 3708 3709 3710 3711 3712 3713 3714 3715 3716 3717 3718 3719 3720 3721 3722 3723 3724 3725 3726 3727 3728 3729 3730 3731 3732 3733 3734 3735
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]]);
3736
	__ieee80211_flush_queues(local, sdata, queues, false);
3737 3738 3739 3740 3741 3742 3743 3744 3745 3746 3747 3748 3749 3750 3751 3752 3753 3754 3755 3756 3757 3758 3759 3760 3761 3762 3763 3764 3765 3766 3767 3768 3769 3770 3771 3772 3773 3774 3775 3776 3777 3778

	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);

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void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata,
				 struct sk_buff *skb, int tid,
				 enum ieee80211_band band)
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{
3783
	int ac = ieee802_1d_to_ac[tid & 7];
3784

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	skb_set_mac_header(skb, 0);
	skb_set_network_header(skb, 0);
	skb_set_transport_header(skb, 0);

3789
	skb_set_queue_mapping(skb, ac);
3790
	skb->priority = tid;
3791

3792 3793
	skb->dev = sdata->dev;

3794 3795 3796 3797 3798 3799
	/*
	 * 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();
3800
	IEEE80211_SKB_CB(skb)->band = band;
3801
	ieee80211_xmit(sdata, NULL, skb);
3802
	local_bh_enable();
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}