tx.c 83.3 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>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 *
 * Transmit and frame generation functions.
 */

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

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

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

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

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

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

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

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

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

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	return cpu_to_le16(dur);
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}

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

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

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

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

	if (!local->ps_sdata)
		return TX_CONTINUE;

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

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

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

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

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

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

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

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

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

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

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	return TX_CONTINUE;
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}

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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	if (!ieee80211_is_robust_mgmt_frame(skb))
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		return 0;

	return 1;
}

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

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

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

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

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

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

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	return TX_CONTINUE;
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}

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

550
	if (tx->flags & IEEE80211_TX_UNICAST)
551 552 553 554 555
		return ieee80211_tx_h_unicast_ps_buf(tx);
	else
		return ieee80211_tx_h_multicast_ps_buf(tx);
}

556 557 558 559 560
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);

561 562 563 564 565
	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;
	}
566 567 568 569

	return TX_CONTINUE;
}

570
static ieee80211_tx_result debug_noinline
571
ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
572
{
573
	struct ieee80211_key *key;
574
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
575
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
576

J
Johannes Berg 已提交
577
	if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT))
578
		tx->key = NULL;
579 580
	else if (tx->sta &&
		 (key = rcu_dereference(tx->sta->ptk[tx->sta->ptk_idx])))
581
		tx->key = key;
582
	else if (ieee80211_is_mgmt(hdr->frame_control) &&
583
		 is_multicast_ether_addr(hdr->addr1) &&
584
		 ieee80211_is_robust_mgmt_frame(tx->skb) &&
585 586
		 (key = rcu_dereference(tx->sdata->default_mgmt_key)))
		tx->key = key;
587 588 589 590 591
	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)))
592
		tx->key = key;
593 594 595 596 597 598
	else if (info->flags & IEEE80211_TX_CTL_INJECTED)
		tx->key = NULL;
	else if (!tx->sdata->drop_unencrypted)
		tx->key = NULL;
	else if (tx->skb->protocol == tx->sdata->control_port_protocol)
		tx->key = NULL;
599
	else if (ieee80211_is_robust_mgmt_frame(tx->skb) &&
600 601 602
		 !(ieee80211_is_action(hdr->frame_control) &&
		   tx->sta && test_sta_flag(tx->sta, WLAN_STA_MFP)))
		tx->key = NULL;
603
	else if (ieee80211_is_mgmt(hdr->frame_control) &&
604
		 !ieee80211_is_robust_mgmt_frame(tx->skb))
605
		tx->key = NULL;
606
	else {
607
		I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted);
608
		return TX_DROP;
609
	}
610 611

	if (tx->key) {
612 613
		bool skip_hw = false;

614
		tx->key->tx_rx_count++;
615
		/* TODO: add threshold stuff again */
616

617 618 619 620
		switch (tx->key->conf.cipher) {
		case WLAN_CIPHER_SUITE_WEP40:
		case WLAN_CIPHER_SUITE_WEP104:
		case WLAN_CIPHER_SUITE_TKIP:
621
			if (!ieee80211_is_data_present(hdr->frame_control))
622 623
				tx->key = NULL;
			break;
624
		case WLAN_CIPHER_SUITE_CCMP:
625 626 627 628
			if (!ieee80211_is_data_present(hdr->frame_control) &&
			    !ieee80211_use_mfp(hdr->frame_control, tx->sta,
					       tx->skb))
				tx->key = NULL;
629 630
			else
				skip_hw = (tx->key->conf.flags &
631
					   IEEE80211_KEY_FLAG_SW_MGMT_TX) &&
632
					ieee80211_is_mgmt(hdr->frame_control);
633
			break;
634
		case WLAN_CIPHER_SUITE_AES_CMAC:
635 636 637
			if (!ieee80211_is_mgmt(hdr->frame_control))
				tx->key = NULL;
			break;
638
		}
639

640 641
		if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED &&
			     !ieee80211_is_deauth(hdr->frame_control)))
642 643
			return TX_DROP;

J
Johannes Berg 已提交
644
		if (!skip_hw && tx->key &&
J
Johannes Berg 已提交
645
		    tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
646
			info->control.hw_key = &tx->key->conf;
647 648
	}

649
	return TX_CONTINUE;
650 651
}

652
static ieee80211_tx_result debug_noinline
653
ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
654
{
655
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
656 657
	struct ieee80211_hdr *hdr = (void *)tx->skb->data;
	struct ieee80211_supported_band *sband;
S
Shanyu Zhao 已提交
658
	u32 len;
659
	struct ieee80211_tx_rate_control txrc;
660
	struct ieee80211_sta_rates *ratetbl = NULL;
J
Johannes Berg 已提交
661
	bool assoc = false;
662

663
	memset(&txrc, 0, sizeof(txrc));
664

665
	sband = tx->local->hw.wiphy->bands[info->band];
666

S
Shanyu Zhao 已提交
667
	len = min_t(u32, tx->skb->len + FCS_LEN,
668
			 tx->local->hw.wiphy->frag_threshold);
669 670

	/* set up the tx rate control struct we give the RC algo */
J
Johannes Berg 已提交
671
	txrc.hw = &tx->local->hw;
672 673 674 675
	txrc.sband = sband;
	txrc.bss_conf = &tx->sdata->vif.bss_conf;
	txrc.skb = tx->skb;
	txrc.reported_rate.idx = -1;
676
	txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band];
677 678 679 680
	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;
681 682 683 684 685

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

686
	txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
687
		    tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT ||
688
		    tx->sdata->vif.type == NL80211_IFTYPE_ADHOC);
689 690

	/* set up RTS protection if desired */
691
	if (len > tx->local->hw.wiphy->rts_threshold) {
692
		txrc.rts = true;
693 694
	}

695
	info->control.use_rts = txrc.rts;
696 697
	info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot;

698 699 700 701 702 703 704 705
	/*
	 * 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
706
	     (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE))))
707 708 709
		txrc.short_preamble = true;

	info->control.short_preamble = txrc.short_preamble;
710

J
Johannes Berg 已提交
711 712
	if (tx->sta)
		assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
713 714 715 716 717

	/*
	 * 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
718
	if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc &&
719 720 721 722
		 !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",
723
		 tx->sdata->name, hdr->addr1,
724
		 info->band ? 5 : 2))
725
		return TX_DROP;
726

727 728 729 730
	/*
	 * If we're associated with the sta at this point we know we can at
	 * least send the frame at the lowest bit rate.
	 */
731 732
	rate_control_get_rate(tx->sdata, tx->sta, &txrc);

733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753
	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];
	}
754

755
	if (txrc.reported_rate.idx < 0) {
756
		txrc.reported_rate = tx->rate;
757 758 759
		if (tx->sta && ieee80211_is_data(hdr->frame_control))
			tx->sta->last_tx_rate = txrc.reported_rate;
	} else if (tx->sta)
760
		tx->sta->last_tx_rate = txrc.reported_rate;
761

762 763 764
	if (ratetbl)
		return TX_CONTINUE;

765 766
	if (unlikely(!info->control.rates[0].count))
		info->control.rates[0].count = 1;
767

768 769 770 771
	if (WARN_ON_ONCE((info->control.rates[0].count > 1) &&
			 (info->flags & IEEE80211_TX_CTL_NO_ACK)))
		info->control.rates[0].count = 1;

772 773 774
	return TX_CONTINUE;
}

775 776 777 778 779 780 781 782 783
static ieee80211_tx_result debug_noinline
ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx)
{
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
	u16 *seq;
	u8 *qc;
	int tid;

784 785 786 787 788
	/*
	 * 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.
	 */
789
	if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR))
790 791
		return TX_CONTINUE;

792 793 794 795 796 797
	if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
		return TX_CONTINUE;

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

798 799 800
	if (ieee80211_is_qos_nullfunc(hdr->frame_control))
		return TX_CONTINUE;

J
Johannes Berg 已提交
801 802 803
	/*
	 * Anything but QoS data that has a sequence number field
	 * (is long enough) gets a sequence number from the global
804 805
	 * 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
806
	 */
807 808
	if (!ieee80211_is_data_qos(hdr->frame_control) ||
	    is_multicast_ether_addr(hdr->addr1)) {
J
Johannes Berg 已提交
809
		/* driver should assign sequence number */
810
		info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
J
Johannes Berg 已提交
811 812 813
		/* 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;
814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838
		return TX_CONTINUE;
	}

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

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

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

	hdr->seq_ctrl = cpu_to_le16(*seq);

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

	return TX_CONTINUE;
}

839
static int ieee80211_fragment(struct ieee80211_tx_data *tx,
J
Johannes Berg 已提交
840 841 842
			      struct sk_buff *skb, int hdrlen,
			      int frag_threshold)
{
843
	struct ieee80211_local *local = tx->local;
844
	struct ieee80211_tx_info *info;
845
	struct sk_buff *tmp;
J
Johannes Berg 已提交
846 847 848 849 850 851 852
	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;

853 854
	/* first fragment was already added to queue by caller */

J
Johannes Berg 已提交
855 856 857 858 859 860 861 862
	while (rem) {
		int fraglen = per_fragm;

		if (fraglen > rem)
			fraglen = rem;
		rem -= fraglen;
		tmp = dev_alloc_skb(local->tx_headroom +
				    frag_threshold +
863
				    tx->sdata->encrypt_headroom +
J
Johannes Berg 已提交
864 865 866
				    IEEE80211_ENCRYPT_TAILROOM);
		if (!tmp)
			return -ENOMEM;
867 868 869

		__skb_queue_tail(&tx->skbs, tmp);

870 871 872
		skb_reserve(tmp,
			    local->tx_headroom + tx->sdata->encrypt_headroom);

J
Johannes Berg 已提交
873 874
		/* copy control information */
		memcpy(tmp->cb, skb->cb, sizeof(tmp->cb));
875 876 877 878 879 880 881 882

		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
883 884 885 886 887 888 889 890 891 892 893
		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;
	}

894
	/* adjust first fragment's length */
895
	skb_trim(skb, hdrlen + per_fragm);
J
Johannes Berg 已提交
896 897 898
	return 0;
}

899
static ieee80211_tx_result debug_noinline
900 901
ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
{
J
Johannes Berg 已提交
902 903 904
	struct sk_buff *skb = tx->skb;
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
	struct ieee80211_hdr *hdr = (void *)skb->data;
905
	int frag_threshold = tx->local->hw.wiphy->frag_threshold;
J
Johannes Berg 已提交
906 907
	int hdrlen;
	int fragnum;
908

909 910 911 912
	/* no matter what happens, tx->skb moves to tx->skbs */
	__skb_queue_tail(&tx->skbs, skb);
	tx->skb = NULL;

913 914 915 916
	if (info->flags & IEEE80211_TX_CTL_DONTFRAG)
		return TX_CONTINUE;

	if (tx->local->ops->set_frag_threshold)
917 918
		return TX_CONTINUE;

919 920
	/*
	 * Warn when submitting a fragmented A-MPDU frame and drop it.
J
Johannes Berg 已提交
921
	 * This scenario is handled in ieee80211_tx_prepare but extra
922
	 * caution taken here as fragmented ampdu may cause Tx stop.
923
	 */
S
Sujith 已提交
924
	if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
925 926
		return TX_DROP;

927
	hdrlen = ieee80211_hdrlen(hdr->frame_control);
928

929
	/* internal error, why isn't DONTFRAG set? */
930
	if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))
J
Johannes Berg 已提交
931
		return TX_DROP;
932

J
Johannes Berg 已提交
933 934 935 936 937 938 939 940
	/*
	 * 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.
	 */
941
	if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold))
J
Johannes Berg 已提交
942
		return TX_DROP;
943

J
Johannes Berg 已提交
944 945
	/* update duration/seq/flags of fragments */
	fragnum = 0;
946 947

	skb_queue_walk(&tx->skbs, skb) {
J
Johannes Berg 已提交
948
		const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
949

J
Johannes Berg 已提交
950 951
		hdr = (void *)skb->data;
		info = IEEE80211_SKB_CB(skb);
952

953
		if (!skb_queue_is_last(&tx->skbs, skb)) {
J
Johannes Berg 已提交
954
			hdr->frame_control |= morefrags;
955 956 957 958 959 960 961
			/*
			 * 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;
962
			BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4);
963
			info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
J
Johannes Berg 已提交
964 965
		} else {
			hdr->frame_control &= ~morefrags;
966
		}
J
Johannes Berg 已提交
967 968
		hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG);
		fragnum++;
969
	}
970

971
	return TX_CONTINUE;
972 973
}

974 975 976
static ieee80211_tx_result debug_noinline
ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
{
977
	struct sk_buff *skb;
978
	int ac = -1;
979 980 981 982

	if (!tx->sta)
		return TX_CONTINUE;

983
	skb_queue_walk(&tx->skbs, skb) {
984
		ac = skb_get_queue_mapping(skb);
985
		tx->sta->tx_fragments++;
986
		tx->sta->tx_bytes[ac] += skb->len;
987
	}
988 989
	if (ac >= 0)
		tx->sta->tx_packets[ac]++;
990 991 992 993

	return TX_CONTINUE;
}

994
static ieee80211_tx_result debug_noinline
995 996 997 998 999
ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
{
	if (!tx->key)
		return TX_CONTINUE;

1000 1001 1002
	switch (tx->key->conf.cipher) {
	case WLAN_CIPHER_SUITE_WEP40:
	case WLAN_CIPHER_SUITE_WEP104:
1003
		return ieee80211_crypto_wep_encrypt(tx);
1004
	case WLAN_CIPHER_SUITE_TKIP:
1005
		return ieee80211_crypto_tkip_encrypt(tx);
1006
	case WLAN_CIPHER_SUITE_CCMP:
1007
		return ieee80211_crypto_ccmp_encrypt(tx);
1008
	case WLAN_CIPHER_SUITE_AES_CMAC:
1009
		return ieee80211_crypto_aes_cmac_encrypt(tx);
1010
	default:
1011
		return ieee80211_crypto_hw_encrypt(tx);
1012 1013 1014 1015 1016
	}

	return TX_DROP;
}

1017
static ieee80211_tx_result debug_noinline
J
Johannes Berg 已提交
1018 1019
ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
{
1020
	struct sk_buff *skb;
J
Johannes Berg 已提交
1021 1022 1023
	struct ieee80211_hdr *hdr;
	int next_len;
	bool group_addr;
J
Johannes Berg 已提交
1024

1025
	skb_queue_walk(&tx->skbs, skb) {
J
Johannes Berg 已提交
1026
		hdr = (void *) skb->data;
1027 1028
		if (unlikely(ieee80211_is_pspoll(hdr->frame_control)))
			break; /* must not overwrite AID */
1029 1030 1031 1032 1033
		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
1034
		group_addr = is_multicast_ether_addr(hdr->addr1);
J
Johannes Berg 已提交
1035

J
Johannes Berg 已提交
1036
		hdr->duration_id =
1037 1038
			ieee80211_duration(tx, skb, group_addr, next_len);
	}
J
Johannes Berg 已提交
1039 1040 1041 1042

	return TX_CONTINUE;
}

1043 1044
/* actual transmit path */

1045 1046 1047 1048 1049 1050 1051
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;
1052
	bool reset_agg_timer = false;
1053
	struct sk_buff *purge_skb = NULL;
1054 1055 1056

	if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
		info->flags |= IEEE80211_TX_CTL_AMPDU;
1057
		reset_agg_timer = true;
1058 1059 1060 1061 1062
	} 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
		 */
1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082
	} else {
		spin_lock(&tx->sta->lock);
		/*
		 * Need to re-check now, because we may get here
		 *
		 *  1) in the window during which the setup is actually
		 *     already done, but not marked yet because not all
		 *     packets are spliced over to the driver pending
		 *     queue yet -- if this happened we acquire the lock
		 *     either before or after the splice happens, but
		 *     need to recheck which of these cases happened.
		 *
		 *  2) during session teardown, if the OPERATIONAL bit
		 *     was cleared due to the teardown but the pointer
		 *     hasn't been assigned NULL yet (or we loaded it
		 *     before it was assigned) -- in this case it may
		 *     now be NULL which means we should just let the
		 *     packet pass through because splicing the frames
		 *     back is already done.
		 */
J
Johannes Berg 已提交
1083
		tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid);
1084 1085 1086 1087 1088

		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;
1089
			reset_agg_timer = true;
1090 1091 1092 1093
		} else {
			queued = true;
			info->control.vif = &tx->sdata->vif;
			info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1094
			info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
1095
			__skb_queue_tail(&tid_tx->pending, skb);
1096 1097
			if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER)
				purge_skb = __skb_dequeue(&tid_tx->pending);
1098 1099
		}
		spin_unlock(&tx->sta->lock);
1100 1101

		if (purge_skb)
1102
			ieee80211_free_txskb(&tx->local->hw, purge_skb);
1103 1104
	}

1105 1106
	/* reset session timer */
	if (reset_agg_timer && tid_tx->timeout)
1107
		tid_tx->last_tx = jiffies;
1108

1109 1110 1111
	return queued;
}

1112 1113 1114
/*
 * initialises @tx
 */
1115
static ieee80211_tx_result
J
Johannes Berg 已提交
1116 1117 1118
ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
		     struct ieee80211_tx_data *tx,
		     struct sk_buff *skb)
1119
{
J
Johannes Berg 已提交
1120
	struct ieee80211_local *local = sdata->local;
1121
	struct ieee80211_hdr *hdr;
1122
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
J
Johannes Berg 已提交
1123
	int tid;
1124
	u8 *qc;
1125 1126 1127 1128

	memset(tx, 0, sizeof(*tx));
	tx->skb = skb;
	tx->local = local;
J
Johannes Berg 已提交
1129
	tx->sdata = sdata;
1130
	__skb_queue_head_init(&tx->skbs);
1131

1132 1133 1134 1135 1136 1137 1138
	/*
	 * 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;

1139 1140
	hdr = (struct ieee80211_hdr *) skb->data;

1141
	if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1142
		tx->sta = rcu_dereference(sdata->u.vlan.sta);
1143 1144
		if (!tx->sta && sdata->dev->ieee80211_ptr->use_4addr)
			return TX_DROP;
1145 1146
	} else if (info->flags & (IEEE80211_TX_CTL_INJECTED |
				  IEEE80211_TX_INTFL_NL80211_FRAME_TX) ||
1147
		   tx->sdata->control_port_protocol == tx->skb->protocol) {
1148
		tx->sta = sta_info_get_bss(sdata, hdr->addr1);
1149
	}
1150
	if (!tx->sta)
1151
		tx->sta = sta_info_get(sdata, hdr->addr1);
1152

1153
	if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) &&
1154
	    !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
1155 1156
	    (local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION) &&
	    !(local->hw.flags & IEEE80211_HW_TX_AMPDU_SETUP_IN_HW)) {
1157 1158
		struct tid_ampdu_tx *tid_tx;

S
Sujith 已提交
1159 1160 1161
		qc = ieee80211_get_qos_ctl(hdr);
		tid = *qc & IEEE80211_QOS_CTL_TID_MASK;

1162 1163 1164
		tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
		if (tid_tx) {
			bool queued;
1165

1166 1167 1168 1169 1170 1171
			queued = ieee80211_tx_prep_agg(tx, skb, info,
						       tid_tx, tid);

			if (unlikely(queued))
				return TX_QUEUED;
		}
S
Sujith 已提交
1172 1173
	}

1174
	if (is_multicast_ether_addr(hdr->addr1)) {
1175
		tx->flags &= ~IEEE80211_TX_UNICAST;
1176
		info->flags |= IEEE80211_TX_CTL_NO_ACK;
1177
	} else
1178
		tx->flags |= IEEE80211_TX_UNICAST;
1179

1180 1181 1182 1183 1184
	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;
1185 1186
	}

1187
	if (!tx->sta)
1188
		info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
J
Johannes Berg 已提交
1189
	else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT))
1190
		info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1191

1192
	info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
1193

1194
	return TX_CONTINUE;
1195 1196
}

1197 1198 1199 1200 1201
static bool ieee80211_tx_frags(struct ieee80211_local *local,
			       struct ieee80211_vif *vif,
			       struct ieee80211_sta *sta,
			       struct sk_buff_head *skbs,
			       bool txpending)
1202
{
1203
	struct ieee80211_tx_control control;
1204
	struct sk_buff *skb, *tmp;
J
Johannes Berg 已提交
1205
	unsigned long flags;
1206

1207
	skb_queue_walk_safe(skbs, skb, tmp) {
1208 1209 1210 1211 1212 1213
		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);
1214
			ieee80211_free_txskb(&local->hw, skb);
1215 1216 1217
			continue;
		}
#endif
J
Johannes Berg 已提交
1218 1219 1220

		spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
		if (local->queue_stop_reasons[q] ||
1221
		    (!txpending && !skb_queue_empty(&local->pending[q]))) {
1222
			if (unlikely(info->flags &
1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240
				     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 {

1241
				/*
1242 1243 1244
				 * Since queue is stopped, queue up frames for
				 * later transmission from the tx-pending
				 * tasklet when the queue is woken again.
1245
				 */
1246 1247 1248 1249 1250 1251 1252 1253 1254 1255
				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;
1256
			}
1257
		}
J
Johannes Berg 已提交
1258
		spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1259

1260
		info->control.vif = vif;
1261
		control.sta = sta;
1262

1263
		__skb_unlink(skb, skbs);
1264
		drv_tx(local, &control, skb);
1265
	}
1266

1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283
	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;
1284

1285 1286
	if (WARN_ON(skb_queue_empty(skbs)))
		return true;
J
Johannes Berg 已提交
1287

1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301
	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:
1302 1303 1304 1305
		if (sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE) {
			vif = &sdata->vif;
			break;
		}
1306
		sdata = rcu_dereference(local->monitor_sdata);
1307
		if (sdata) {
1308
			vif = &sdata->vif;
1309 1310 1311 1312 1313 1314
			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
1315
			vif = NULL;
1316 1317 1318 1319 1320 1321 1322 1323
		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;
1324
	}
J
Johannes Berg 已提交
1325

1326 1327
	result = ieee80211_tx_frags(local, vif, pubsta, skbs,
				    txpending);
1328

1329 1330
	ieee80211_tpt_led_trig_tx(local, fc, led_len);

J
Johannes Berg 已提交
1331
	WARN_ON_ONCE(!skb_queue_empty(skbs));
1332

1333
	return result;
1334 1335
}

1336 1337 1338 1339 1340 1341
/*
 * 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)
{
1342
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
1343 1344
	ieee80211_tx_result res = TX_DROP;

1345 1346 1347 1348 1349 1350 1351
#define CALL_TXH(txh) \
	do {				\
		res = txh(tx);		\
		if (res != TX_CONTINUE)	\
			goto txh_done;	\
	} while (0)

1352
	CALL_TXH(ieee80211_tx_h_dynamic_ps);
1353 1354
	CALL_TXH(ieee80211_tx_h_check_assoc);
	CALL_TXH(ieee80211_tx_h_ps_buf);
1355
	CALL_TXH(ieee80211_tx_h_check_control_port_protocol);
1356
	CALL_TXH(ieee80211_tx_h_select_key);
1357 1358
	if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
		CALL_TXH(ieee80211_tx_h_rate_ctrl);
1359

J
Johannes Berg 已提交
1360 1361 1362
	if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) {
		__skb_queue_tail(&tx->skbs, tx->skb);
		tx->skb = NULL;
1363
		goto txh_done;
J
Johannes Berg 已提交
1364
	}
1365 1366

	CALL_TXH(ieee80211_tx_h_michael_mic_add);
1367 1368
	CALL_TXH(ieee80211_tx_h_sequence);
	CALL_TXH(ieee80211_tx_h_fragment);
1369
	/* handlers after fragment must be aware of tx info fragmentation! */
1370 1371
	CALL_TXH(ieee80211_tx_h_stats);
	CALL_TXH(ieee80211_tx_h_encrypt);
1372 1373
	if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
		CALL_TXH(ieee80211_tx_h_calculate_duration);
1374
#undef CALL_TXH
1375

1376
 txh_done:
1377
	if (unlikely(res == TX_DROP)) {
1378
		I802_DEBUG_INC(tx->local->tx_handlers_drop);
1379
		if (tx->skb)
1380
			ieee80211_free_txskb(&tx->local->hw, tx->skb);
1381
		else
1382
			ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs);
1383 1384
		return -1;
	} else if (unlikely(res == TX_QUEUED)) {
1385
		I802_DEBUG_INC(tx->local->tx_handlers_queued);
1386 1387 1388 1389 1390 1391
		return -1;
	}

	return 0;
}

1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420
bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw,
			      struct ieee80211_vif *vif, struct sk_buff *skb,
			      int band, struct ieee80211_sta **sta)
{
	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
	struct ieee80211_tx_data tx;

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

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

	if (invoke_tx_handlers(&tx))
		return false;

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

	return true;
}
EXPORT_SYMBOL(ieee80211_tx_prepare_skb);

1421 1422 1423 1424
/*
 * Returns false if the frame couldn't be transmitted but was queued instead.
 */
static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata,
J
Johannes Berg 已提交
1425 1426
			 struct sk_buff *skb, bool txpending,
			 enum ieee80211_band band)
1427
{
J
Johannes Berg 已提交
1428
	struct ieee80211_local *local = sdata->local;
1429
	struct ieee80211_tx_data tx;
1430
	ieee80211_tx_result res_prepare;
1431
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1432
	bool result = true;
1433
	int led_len;
1434 1435 1436

	if (unlikely(skb->len < 10)) {
		dev_kfree_skb(skb);
1437
		return true;
1438 1439
	}

1440
	/* initialises tx */
1441
	led_len = skb->len;
J
Johannes Berg 已提交
1442
	res_prepare = ieee80211_tx_prepare(sdata, &tx, skb);
1443

1444
	if (unlikely(res_prepare == TX_DROP)) {
1445
		ieee80211_free_txskb(&local->hw, skb);
J
Johannes Berg 已提交
1446
		return true;
1447
	} else if (unlikely(res_prepare == TX_QUEUED)) {
J
Johannes Berg 已提交
1448
		return true;
1449 1450
	}

J
Johannes Berg 已提交
1451
	info->band = band;
1452

1453 1454 1455 1456 1457 1458
	/* 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)];

1459
	if (!invoke_tx_handlers(&tx))
1460 1461
		result = __ieee80211_tx(local, &tx.skbs, led_len,
					tx.sta, txpending);
J
Johannes Berg 已提交
1462

1463
	return result;
1464 1465 1466 1467
}

/* device xmit handlers */

1468
static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata,
1469 1470 1471
				struct sk_buff *skb,
				int head_need, bool may_encrypt)
{
1472
	struct ieee80211_local *local = sdata->local;
1473 1474
	int tail_need = 0;

1475
	if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) {
1476 1477 1478 1479 1480
		tail_need = IEEE80211_ENCRYPT_TAILROOM;
		tail_need -= skb_tailroom(skb);
		tail_need = max_t(int, tail_need, 0);
	}

1481 1482 1483 1484
	if (skb_cloned(skb) &&
	    (!(local->hw.flags & IEEE80211_HW_SUPPORTS_CLONED_SKBS) ||
	     !skb_clone_writable(skb, ETH_HLEN) ||
	     sdata->crypto_tx_tailroom_needed_cnt))
1485
		I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1486
	else if (head_need || tail_need)
1487
		I802_DEBUG_INC(local->tx_expand_skb_head);
1488 1489
	else
		return 0;
1490 1491

	if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
J
Joe Perches 已提交
1492 1493
		wiphy_debug(local->hw.wiphy,
			    "failed to reallocate TX buffer\n");
1494 1495 1496 1497 1498 1499
		return -ENOMEM;
	}

	return 0;
}

J
Johannes Berg 已提交
1500 1501
void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
		    enum ieee80211_band band)
1502
{
J
Johannes Berg 已提交
1503
	struct ieee80211_local *local = sdata->local;
1504
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1505
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1506
	int headroom;
1507
	bool may_encrypt;
1508

J
Johannes Berg 已提交
1509
	may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT);
1510

J
Johannes Berg 已提交
1511
	headroom = local->tx_headroom;
1512
	if (may_encrypt)
1513
		headroom += sdata->encrypt_headroom;
1514 1515 1516
	headroom -= skb_headroom(skb);
	headroom = max_t(int, 0, headroom);

1517
	if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) {
1518
		ieee80211_free_txskb(&local->hw, skb);
J
Johannes Berg 已提交
1519
		return;
1520 1521
	}

1522
	hdr = (struct ieee80211_hdr *) skb->data;
1523
	info->control.vif = &sdata->vif;
1524

M
Marco Porsch 已提交
1525 1526 1527
	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
1528
			if (mesh_nexthop_resolve(sdata, skb))
M
Marco Porsch 已提交
1529 1530 1531 1532
				return; /* skb queued: don't free */
		} else {
			ieee80211_mps_set_frame_flags(sdata, NULL, hdr);
		}
1533
	}
1534

1535
	ieee80211_set_qos_hdr(sdata, skb);
J
Johannes Berg 已提交
1536
	ieee80211_tx(sdata, skb, false, band);
1537 1538
}

1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621
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;
}

1622 1623
netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
					 struct net_device *dev)
1624 1625
{
	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
J
Johannes Berg 已提交
1626
	struct ieee80211_chanctx_conf *chanctx_conf;
1627 1628
	struct ieee80211_radiotap_header *prthdr =
		(struct ieee80211_radiotap_header *)skb->data;
J
Johannes Berg 已提交
1629
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1630
	struct ieee80211_hdr *hdr;
J
Johannes Berg 已提交
1631
	struct ieee80211_sub_if_data *tmp_sdata, *sdata;
1632
	struct cfg80211_chan_def *chandef;
1633
	u16 len_rthdr;
J
Johannes Berg 已提交
1634
	int hdrlen;
1635

1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649
	/* 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 */
1650 1651 1652 1653 1654 1655 1656

	/*
	 * 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
	 */
1657
	skb_set_mac_header(skb, len_rthdr);
1658
	/*
1659 1660
	 * 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
1661
	 */
1662 1663
	skb_set_network_header(skb, len_rthdr);
	skb_set_transport_header(skb, len_rthdr);
1664

J
Johannes Berg 已提交
1665 1666 1667 1668 1669 1670 1671 1672 1673
	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;

1674 1675 1676 1677
	/*
	 * Initialize skb->protocol if the injected frame is a data frame
	 * carrying a rfc1042 header
	 */
J
Johannes Berg 已提交
1678 1679 1680 1681
	if (ieee80211_is_data(hdr->frame_control) &&
	    skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) {
		u8 *payload = (u8 *)hdr + hdrlen;

1682
		if (ether_addr_equal(payload, rfc1042_header))
J
Johannes Berg 已提交
1683 1684
			skb->protocol = cpu_to_be16((payload[6] << 8) |
						    payload[7]);
1685 1686
	}

J
Johannes Berg 已提交
1687 1688
	memset(info, 0, sizeof(*info));

J
Johannes Berg 已提交
1689
	info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
1690 1691 1692 1693 1694
		      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
1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714

	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;
1715
		if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) {
J
Johannes Berg 已提交
1716 1717 1718 1719
			sdata = tmp_sdata;
			break;
		}
	}
1720

J
Johannes Berg 已提交
1721 1722 1723 1724 1725 1726 1727 1728
	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);
	}

1729
	if (chanctx_conf)
1730
		chandef = &chanctx_conf->def;
1731
	else if (!local->use_chanctx)
1732
		chandef = &local->_oper_chandef;
1733 1734
	else
		goto fail_rcu;
J
Johannes Berg 已提交
1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751

	/*
	 * 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.
	 */
1752 1753
	if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef,
				     sdata->vif.type))
J
Johannes Berg 已提交
1754 1755
		goto fail_rcu;

1756
	ieee80211_xmit(sdata, skb, chandef->chan->band);
J
Johannes Berg 已提交
1757 1758
	rcu_read_unlock();

1759
	return NETDEV_TX_OK;
1760

J
Johannes Berg 已提交
1761 1762
fail_rcu:
	rcu_read_unlock();
1763 1764 1765
fail:
	dev_kfree_skb(skb);
	return NETDEV_TX_OK; /* meaning, we dealt with the skb */
1766 1767
}

1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781
/*
 * Measure Tx frame arrival time for Tx latency statistics calculation
 * A single Tx frame latency should be measured from when it is entering the
 * Kernel until we receive Tx complete confirmation indication and the skb is
 * freed.
 */
static void ieee80211_tx_latency_start_msrmnt(struct ieee80211_local *local,
					      struct sk_buff *skb)
{
	struct ieee80211_tx_latency_bin_ranges *tx_latency;

	tx_latency = rcu_dereference(local->tx_latency);
	if (!tx_latency)
		return;
1782
	skb->tstamp = ktime_get();
1783 1784
}

1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799
/**
 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
 * subinterfaces (wlan#, WDS, and VLAN interfaces)
 * @skb: packet to be sent
 * @dev: incoming interface
 *
 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
 * not be freed, and caller is responsible for either retrying later or freeing
 * skb).
 *
 * This function takes in an Ethernet header and encapsulates it with suitable
 * IEEE 802.11 header based on which interface the packet is coming in. The
 * encapsulated packet will then be passed to master interface, wlan#.11, for
 * transmission (through low-level driver).
 */
1800 1801
netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
				    struct net_device *dev)
1802
{
1803 1804
	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
	struct ieee80211_local *local = sdata->local;
1805
	struct ieee80211_tx_info *info;
1806
	int head_need;
1807 1808
	u16 ethertype, hdrlen,  meshhdrlen = 0;
	__le16 fc;
1809
	struct ieee80211_hdr hdr;
1810
	struct ieee80211s_hdr mesh_hdr __maybe_unused;
1811
	struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL;
1812 1813
	const u8 *encaps_data;
	int encaps_len, skip_header_bytes;
1814
	int nh_pos, h_pos;
1815
	struct sta_info *sta = NULL;
J
Johannes Berg 已提交
1816
	bool wme_sta = false, authorized = false, tdls_auth = false;
1817
	bool tdls_peer = false, tdls_setup_frame = false;
J
Johannes Berg 已提交
1818 1819 1820
	bool multicast;
	u32 info_flags = 0;
	u16 info_id = 0;
J
Johannes Berg 已提交
1821 1822 1823
	struct ieee80211_chanctx_conf *chanctx_conf;
	struct ieee80211_sub_if_data *ap_sdata;
	enum ieee80211_band band;
1824

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

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

J
Johannes Berg 已提交
1833 1834
	rcu_read_lock();

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

		I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);

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

J
Johannes Berg 已提交
2073 2074 2075 2076 2077 2078 2079
	if (unlikely(!multicast && skb->sk &&
		     skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) {
		struct sk_buff *orig_skb = skb;

		skb = skb_clone(skb, GFP_ATOMIC);
		if (skb) {
			unsigned long flags;
T
Tejun Heo 已提交
2080
			int id;
J
Johannes Berg 已提交
2081 2082

			spin_lock_irqsave(&local->ack_status_lock, flags);
T
Tejun Heo 已提交
2083 2084
			id = idr_alloc(&local->ack_status_frames, orig_skb,
				       1, 0x10000, GFP_ATOMIC);
J
Johannes Berg 已提交
2085 2086
			spin_unlock_irqrestore(&local->ack_status_lock, flags);

T
Tejun Heo 已提交
2087
			if (id >= 0) {
J
Johannes Berg 已提交
2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101
				info_id = id;
				info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
			} else if (skb_shared(skb)) {
				kfree_skb(orig_skb);
			} else {
				kfree_skb(skb);
				skb = orig_skb;
			}
		} else {
			/* couldn't clone -- lose tx status ... */
			skb = orig_skb;
		}
	}

2102 2103 2104 2105
	/*
	 * If the skb is shared we need to obtain our own copy.
	 */
	if (skb_shared(skb)) {
J
Johannes Berg 已提交
2106 2107 2108 2109 2110
		struct sk_buff *tmp_skb = skb;

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

2111
		skb = skb_clone(skb, GFP_ATOMIC);
2112 2113
		kfree_skb(tmp_skb);

2114
		if (!skb)
J
Johannes Berg 已提交
2115
			goto fail_rcu;
2116 2117
	}

2118
	hdr.frame_control = fc;
2119 2120 2121 2122 2123 2124 2125 2126
	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
2127
	} else if (ethertype >= ETH_P_802_3_MIN) {
2128 2129 2130 2131 2132 2133 2134 2135
		encaps_data = rfc1042_header;
		encaps_len = sizeof(rfc1042_header);
		skip_header_bytes -= 2;
	} else {
		encaps_data = NULL;
		encaps_len = 0;
	}

2136 2137 2138
	nh_pos = skb_network_header(skb) - skb->data;
	h_pos = skb_transport_header(skb) - skb->data;

2139 2140 2141 2142
	skb_pull(skb, skip_header_bytes);
	nh_pos -= skip_header_bytes;
	h_pos -= skip_header_bytes;

2143
	head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
2144

2145 2146 2147 2148 2149 2150 2151 2152 2153 2154 2155
	/*
	 * 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.
	 */
2156

2157
	if (head_need > 0 || skb_cloned(skb)) {
2158
		head_need += sdata->encrypt_headroom;
2159 2160
		head_need += local->tx_headroom;
		head_need = max_t(int, 0, head_need);
2161 2162
		if (ieee80211_skb_resize(sdata, skb, head_need, true)) {
			ieee80211_free_txskb(&local->hw, skb);
J
Johannes Berg 已提交
2163
			skb = NULL;
J
Johannes Berg 已提交
2164
			goto fail_rcu;
2165
		}
2166 2167 2168 2169 2170 2171 2172
	}

	if (encaps_data) {
		memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
		nh_pos += encaps_len;
		h_pos += encaps_len;
	}
2173

2174
#ifdef CONFIG_MAC80211_MESH
2175 2176 2177 2178 2179
	if (meshhdrlen > 0) {
		memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
		nh_pos += meshhdrlen;
		h_pos += meshhdrlen;
	}
2180
#endif
2181

2182
	if (ieee80211_is_data_qos(fc)) {
2183 2184
		__le16 *qos_control;

W
Weilong Chen 已提交
2185
		qos_control = (__le16 *) skb_push(skb, 2);
2186 2187 2188 2189 2190 2191 2192 2193 2194
		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);

2195 2196 2197
	nh_pos += hdrlen;
	h_pos += hdrlen;

2198 2199
	dev->stats.tx_packets++;
	dev->stats.tx_bytes += skb->len;
2200 2201 2202 2203 2204 2205 2206 2207

	/* 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);

2208
	info = IEEE80211_SKB_CB(skb);
J
Johannes Berg 已提交
2209 2210
	memset(info, 0, sizeof(*info));

2211
	dev->trans_start = jiffies;
J
Johannes Berg 已提交
2212 2213 2214 2215

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

J
Johannes Berg 已提交
2216 2217
	ieee80211_xmit(sdata, skb, band);
	rcu_read_unlock();
2218

2219
	return NETDEV_TX_OK;
2220

J
Johannes Berg 已提交
2221 2222
 fail_rcu:
	rcu_read_unlock();
2223
 fail:
2224 2225
	dev_kfree_skb(skb);
	return NETDEV_TX_OK;
2226 2227 2228
}


2229 2230 2231 2232
/*
 * ieee80211_clear_tx_pending may not be called in a context where
 * it is possible that it packets could come in again.
 */
2233 2234
void ieee80211_clear_tx_pending(struct ieee80211_local *local)
{
2235
	struct sk_buff *skb;
J
Johannes Berg 已提交
2236
	int i;
2237

2238 2239 2240 2241
	for (i = 0; i < local->hw.queues; i++) {
		while ((skb = skb_dequeue(&local->pending[i])) != NULL)
			ieee80211_free_txskb(&local->hw, skb);
	}
2242 2243
}

2244 2245 2246 2247 2248
/*
 * 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.
 */
2249 2250 2251 2252 2253 2254 2255
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;
2256
	bool result;
J
Johannes Berg 已提交
2257
	struct ieee80211_chanctx_conf *chanctx_conf;
2258

2259
	sdata = vif_to_sdata(info->control.vif);
2260 2261

	if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) {
J
Johannes Berg 已提交
2262 2263 2264 2265 2266 2267
		chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
		if (unlikely(!chanctx_conf)) {
			dev_kfree_skb(skb);
			return true;
		}
		result = ieee80211_tx(sdata, skb, true,
2268
				      chanctx_conf->def.chan->band);
2269
	} else {
2270 2271 2272 2273 2274
		struct sk_buff_head skbs;

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

2275
		hdr = (struct ieee80211_hdr *)skb->data;
2276
		sta = sta_info_get(sdata, hdr->addr1);
2277

2278
		result = __ieee80211_tx(local, &skbs, skb->len, sta, true);
2279 2280 2281 2282 2283
	}

	return result;
}

2284
/*
J
Johannes Berg 已提交
2285
 * Transmit all pending packets. Called from tasklet.
2286
 */
2287 2288 2289
void ieee80211_tx_pending(unsigned long data)
{
	struct ieee80211_local *local = (struct ieee80211_local *)data;
2290
	unsigned long flags;
2291
	int i;
J
Johannes Berg 已提交
2292
	bool txok;
2293

2294
	rcu_read_lock();
2295

J
Johannes Berg 已提交
2296
	spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
2297 2298 2299 2300 2301
	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
2302
		if (local->queue_stop_reasons[i] ||
2303
		    skb_queue_empty(&local->pending[i]))
2304
			continue;
2305

2306
		while (!skb_queue_empty(&local->pending[i])) {
J
Johannes Berg 已提交
2307
			struct sk_buff *skb = __skb_dequeue(&local->pending[i]);
2308 2309
			struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);

2310
			if (WARN_ON(!info->control.vif)) {
2311
				ieee80211_free_txskb(&local->hw, skb);
2312 2313 2314
				continue;
			}

J
Johannes Berg 已提交
2315 2316 2317 2318 2319 2320 2321
			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)
2322
				break;
2323
		}
2324 2325

		if (skb_queue_empty(&local->pending[i]))
2326
			ieee80211_propagate_queue_wake(local, i);
2327
	}
J
Johannes Berg 已提交
2328
	spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
2329

2330
	rcu_read_unlock();
2331 2332 2333 2334
}

/* functions for drivers to get certain frames */

2335
static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
2336 2337
				       struct ps_data *ps, struct sk_buff *skb,
				       bool is_template)
2338 2339 2340 2341 2342 2343 2344
{
	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. */
2345
	if (atomic_read(&ps->num_sta_ps) > 0)
2346 2347
		/* in the hope that this is faster than
		 * checking byte-for-byte */
W
Weilong Chen 已提交
2348
		have_bits = !bitmap_empty((unsigned long *)ps->tim,
2349
					  IEEE80211_MAX_AID+1);
2350 2351 2352 2353 2354 2355
	if (!is_template) {
		if (ps->dtim_count == 0)
			ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1;
		else
			ps->dtim_count--;
	}
2356 2357 2358 2359

	tim = pos = (u8 *) skb_put(skb, 6);
	*pos++ = WLAN_EID_TIM;
	*pos++ = 4;
2360
	*pos++ = ps->dtim_count;
2361
	*pos++ = sdata->vif.bss_conf.dtim_period;
2362

2363
	if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf))
2364 2365
		aid0 = 1;

2366
	ps->dtim_bc_mc = aid0 == 1;
2367

2368 2369 2370 2371 2372 2373
	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++) {
2374
			if (ps->tim[i]) {
2375 2376 2377 2378 2379 2380
				n1 = i & 0xfe;
				break;
			}
		}
		n2 = n1;
		for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
2381
			if (ps->tim[i]) {
2382 2383 2384 2385 2386 2387 2388 2389
				n2 = i;
				break;
			}
		}

		/* Bitmap control */
		*pos++ = n1 | aid0;
		/* Part Virt Bitmap */
2390
		skb_put(skb, n2 - n1);
2391
		memcpy(pos, ps->tim + n1, n2 - n1 + 1);
2392 2393 2394 2395 2396 2397 2398 2399

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

2400
static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
2401 2402
				    struct ps_data *ps, struct sk_buff *skb,
				    bool is_template)
2403 2404 2405 2406 2407 2408 2409 2410 2411 2412 2413
{
	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) {
2414
		__ieee80211_beacon_add_tim(sdata, ps, skb, is_template);
2415
	} else {
J
Johannes Berg 已提交
2416
		spin_lock_bh(&local->tim_lock);
2417
		__ieee80211_beacon_add_tim(sdata, ps, skb, is_template);
J
Johannes Berg 已提交
2418
		spin_unlock_bh(&local->tim_lock);
2419 2420 2421 2422 2423
	}

	return 0;
}

2424 2425
static void ieee80211_set_csa(struct ieee80211_sub_if_data *sdata,
			      struct beacon_data *beacon)
2426 2427
{
	struct probe_resp *resp;
2428 2429
	u8 *beacon_data;
	size_t beacon_data_len;
2430
	int i;
2431
	u8 count = beacon->csa_current_counter;
2432 2433 2434 2435 2436 2437 2438 2439 2440 2441

	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;
2442 2443 2444 2445
	case NL80211_IFTYPE_MESH_POINT:
		beacon_data = beacon->head;
		beacon_data_len = beacon->head_len;
		break;
2446 2447 2448
	default:
		return;
	}
2449

2450
	rcu_read_lock();
2451
	for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; ++i) {
2452
		resp = rcu_dereference(sdata->u.ap.probe_resp);
2453

2454 2455 2456
		if (beacon->csa_counter_offsets[i]) {
			if (WARN_ON_ONCE(beacon->csa_counter_offsets[i] >=
					 beacon_data_len)) {
2457 2458 2459
				rcu_read_unlock();
				return;
			}
2460 2461

			beacon_data[beacon->csa_counter_offsets[i]] = count;
2462
		}
2463 2464 2465

		if (sdata->vif.type == NL80211_IFTYPE_AP && resp)
			resp->data[resp->csa_counter_offsets[i]] = count;
2466
	}
2467
	rcu_read_unlock();
2468 2469 2470 2471 2472
}

u8 ieee80211_csa_update_counter(struct ieee80211_vif *vif)
{
	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2473 2474
	struct beacon_data *beacon = NULL;
	u8 count = 0;
2475

2476 2477 2478 2479 2480 2481 2482 2483 2484 2485 2486 2487 2488
	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--;
2489 2490

	/* the counter should never reach 0 */
2491 2492
	WARN_ON_ONCE(!beacon->csa_current_counter);
	count = beacon->csa_current_counter;
2493

2494 2495 2496
unlock:
	rcu_read_unlock();
	return count;
2497
}
2498
EXPORT_SYMBOL(ieee80211_csa_update_counter);
2499 2500 2501 2502 2503 2504 2505 2506 2507 2508 2509 2510 2511 2512 2513 2514 2515 2516 2517 2518 2519

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;
2520 2521 2522 2523 2524 2525 2526
	} else if (vif->type == NL80211_IFTYPE_ADHOC) {
		struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;

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

2527 2528 2529 2530 2531 2532 2533 2534 2535
		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;

2536 2537
		beacon_data = beacon->head;
		beacon_data_len = beacon->head_len;
2538 2539 2540 2541 2542
	} else {
		WARN_ON(1);
		goto out;
	}

2543 2544 2545
	if (!beacon->csa_counter_offsets[0])
		goto out;

2546
	if (WARN_ON_ONCE(beacon->csa_counter_offsets[0] > beacon_data_len))
2547 2548
		goto out;

2549
	if (beacon_data[beacon->csa_counter_offsets[0]] == 1)
2550 2551 2552 2553 2554 2555 2556 2557
		ret = true;
 out:
	rcu_read_unlock();

	return ret;
}
EXPORT_SYMBOL(ieee80211_csa_is_complete);

2558 2559 2560 2561 2562
static struct sk_buff *
__ieee80211_beacon_get(struct ieee80211_hw *hw,
		       struct ieee80211_vif *vif,
		       struct ieee80211_mutable_offsets *offs,
		       bool is_template)
2563 2564
{
	struct ieee80211_local *local = hw_to_local(hw);
2565
	struct beacon_data *beacon = NULL;
2566
	struct sk_buff *skb = NULL;
2567
	struct ieee80211_tx_info *info;
2568
	struct ieee80211_sub_if_data *sdata = NULL;
J
Johannes Berg 已提交
2569
	enum ieee80211_band band;
2570
	struct ieee80211_tx_rate_control txrc;
J
Johannes Berg 已提交
2571
	struct ieee80211_chanctx_conf *chanctx_conf;
2572
	int csa_off_base = 0;
2573

2574
	rcu_read_lock();
2575

2576
	sdata = vif_to_sdata(vif);
J
Johannes Berg 已提交
2577
	chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2578

J
Johannes Berg 已提交
2579
	if (!ieee80211_sdata_running(sdata) || !chanctx_conf)
2580 2581
		goto out;

2582 2583
	if (offs)
		memset(offs, 0, sizeof(*offs));
2584

2585
	if (sdata->vif.type == NL80211_IFTYPE_AP) {
2586 2587
		struct ieee80211_if_ap *ap = &sdata->u.ap;

2588
		beacon = rcu_dereference(ap->beacon);
D
Dan Carpenter 已提交
2589
		if (beacon) {
2590
			if (beacon->csa_counter_offsets[0]) {
2591 2592 2593 2594 2595
				if (!is_template)
					ieee80211_csa_update_counter(vif);

				ieee80211_set_csa(sdata, beacon);
			}
2596

J
Johannes Berg 已提交
2597 2598 2599 2600 2601 2602
			/*
			 * headroom, head length,
			 * tail length and maximum TIM length
			 */
			skb = dev_alloc_skb(local->tx_headroom +
					    beacon->head_len +
2603 2604
					    beacon->tail_len + 256 +
					    local->hw.extra_beacon_tailroom);
J
Johannes Berg 已提交
2605 2606
			if (!skb)
				goto out;
2607

J
Johannes Berg 已提交
2608 2609 2610
			skb_reserve(skb, local->tx_headroom);
			memcpy(skb_put(skb, beacon->head_len), beacon->head,
			       beacon->head_len);
2611

2612 2613
			ieee80211_beacon_add_tim(sdata, &ap->ps, skb,
						 is_template);
2614

2615 2616 2617
			if (offs) {
				offs->tim_offset = beacon->head_len;
				offs->tim_length = skb->len - beacon->head_len;
2618 2619 2620

				/* for AP the csa offsets are from tail */
				csa_off_base = skb->len;
2621
			}
2622

J
Johannes Berg 已提交
2623 2624 2625
			if (beacon->tail)
				memcpy(skb_put(skb, beacon->tail_len),
				       beacon->tail, beacon->tail_len);
2626 2627
		} else
			goto out;
2628
	} else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
2629
		struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
2630
		struct ieee80211_hdr *hdr;
2631

2632 2633
		beacon = rcu_dereference(ifibss->presp);
		if (!beacon)
2634 2635
			goto out;

2636
		if (beacon->csa_counter_offsets[0]) {
2637 2638
			if (!is_template)
				ieee80211_csa_update_counter(vif);
2639

2640
			ieee80211_set_csa(sdata, beacon);
2641
		}
2642

2643
		skb = dev_alloc_skb(local->tx_headroom + beacon->head_len +
2644
				    local->hw.extra_beacon_tailroom);
2645 2646
		if (!skb)
			goto out;
2647
		skb_reserve(skb, local->tx_headroom);
2648 2649
		memcpy(skb_put(skb, beacon->head_len), beacon->head,
		       beacon->head_len);
2650 2651

		hdr = (struct ieee80211_hdr *) skb->data;
2652 2653
		hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
						 IEEE80211_STYPE_BEACON);
J
Johannes Berg 已提交
2654
	} else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2655
		struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2656

2657 2658
		beacon = rcu_dereference(ifmsh->beacon);
		if (!beacon)
2659 2660
			goto out;

2661
		if (beacon->csa_counter_offsets[0]) {
2662 2663 2664 2665 2666 2667 2668 2669
			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);

2670
			ieee80211_set_csa(sdata, beacon);
2671
		}
2672

2673
		if (ifmsh->sync_ops)
2674
			ifmsh->sync_ops->adjust_tbtt(sdata, beacon);
2675

2676
		skb = dev_alloc_skb(local->tx_headroom +
2677
				    beacon->head_len +
M
Marco Porsch 已提交
2678
				    256 + /* TIM IE */
2679
				    beacon->tail_len +
2680
				    local->hw.extra_beacon_tailroom);
J
Johannes Berg 已提交
2681 2682
		if (!skb)
			goto out;
T
Thomas Pedersen 已提交
2683
		skb_reserve(skb, local->tx_headroom);
2684 2685
		memcpy(skb_put(skb, beacon->head_len), beacon->head,
		       beacon->head_len);
2686 2687 2688
		ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb, is_template);

		if (offs) {
2689 2690
			offs->tim_offset = beacon->head_len;
			offs->tim_length = skb->len - beacon->head_len;
2691 2692
		}

2693 2694
		memcpy(skb_put(skb, beacon->tail_len), beacon->tail,
		       beacon->tail_len);
2695 2696
	} else {
		WARN_ON(1);
2697
		goto out;
2698 2699
	}

2700
	/* CSA offsets */
2701
	if (offs && beacon) {
2702 2703 2704
		int i;

		for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; i++) {
2705
			u16 csa_off = beacon->csa_counter_offsets[i];
2706 2707 2708 2709 2710 2711 2712 2713

			if (!csa_off)
				continue;

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

2714
	band = chanctx_conf->def.chan->band;
J
Johannes Berg 已提交
2715

2716 2717
	info = IEEE80211_SKB_CB(skb);

J
Johannes Berg 已提交
2718
	info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
2719
	info->flags |= IEEE80211_TX_CTL_NO_ACK;
2720
	info->band = band;
2721 2722 2723

	memset(&txrc, 0, sizeof(txrc));
	txrc.hw = hw;
2724
	txrc.sband = local->hw.wiphy->bands[band];
2725 2726 2727
	txrc.bss_conf = &sdata->vif.bss_conf;
	txrc.skb = skb;
	txrc.reported_rate.idx = -1;
2728
	txrc.rate_idx_mask = sdata->rc_rateidx_mask[band];
2729
	if (txrc.rate_idx_mask == (1 << txrc.sband->n_bitrates) - 1)
2730 2731 2732
		txrc.max_rate_idx = -1;
	else
		txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
2733
	txrc.bss = true;
2734
	rate_control_get_rate(sdata, NULL, &txrc);
2735 2736

	info->control.vif = vif;
2737

2738 2739 2740
	info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT |
			IEEE80211_TX_CTL_ASSIGN_SEQ |
			IEEE80211_TX_CTL_FIRST_FRAGMENT;
2741
 out:
2742
	rcu_read_unlock();
2743
	return skb;
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

}

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;
2770
}
2771
EXPORT_SYMBOL(ieee80211_beacon_get_tim);
2772

2773 2774 2775 2776
struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw,
					struct ieee80211_vif *vif)
{
	struct ieee80211_if_ap *ap = NULL;
2777 2778
	struct sk_buff *skb = NULL;
	struct probe_resp *presp = NULL;
2779 2780 2781 2782 2783 2784 2785 2786 2787 2788 2789 2790 2791
	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;

2792
	skb = dev_alloc_skb(presp->len);
2793 2794 2795
	if (!skb)
		goto out;

2796 2797
	memcpy(skb_put(skb, presp->len), presp->data, presp->len);

2798 2799 2800 2801 2802 2803 2804 2805 2806
	hdr = (struct ieee80211_hdr *) skb->data;
	memset(hdr->addr1, 0, sizeof(hdr->addr1));

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

2807 2808 2809 2810 2811 2812 2813 2814 2815 2816 2817 2818 2819 2820 2821 2822 2823
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));
2824
	if (!skb)
2825
		return NULL;
2826

2827 2828 2829 2830 2831 2832 2833 2834 2835 2836 2837 2838 2839 2840 2841 2842 2843 2844 2845 2846 2847 2848 2849 2850 2851 2852 2853 2854 2855 2856 2857 2858 2859 2860 2861
	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));
2862
	if (!skb)
2863
		return NULL;
2864

2865 2866 2867 2868 2869 2870 2871 2872 2873 2874 2875 2876 2877 2878 2879 2880
	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);

2881 2882 2883
struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw,
				       struct ieee80211_vif *vif,
				       const u8 *ssid, size_t ssid_len,
2884
				       size_t tailroom)
2885 2886 2887 2888 2889 2890 2891 2892 2893 2894 2895 2896 2897
{
	struct ieee80211_sub_if_data *sdata;
	struct ieee80211_local *local;
	struct ieee80211_hdr_3addr *hdr;
	struct sk_buff *skb;
	size_t ie_ssid_len;
	u8 *pos;

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

	skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) +
2898
			    ie_ssid_len + tailroom);
2899
	if (!skb)
2900 2901 2902 2903 2904 2905 2906 2907
		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
2908
	eth_broadcast_addr(hdr->addr1);
2909
	memcpy(hdr->addr2, vif->addr, ETH_ALEN);
J
Johannes Berg 已提交
2910
	eth_broadcast_addr(hdr->addr3);
2911 2912 2913 2914

	pos = skb_put(skb, ie_ssid_len);
	*pos++ = WLAN_EID_SSID;
	*pos++ = ssid_len;
2915
	if (ssid_len)
2916 2917 2918 2919 2920 2921 2922
		memcpy(pos, ssid, ssid_len);
	pos += ssid_len;

	return skb;
}
EXPORT_SYMBOL(ieee80211_probereq_get);

2923
void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
2924
		       const void *frame, size_t frame_len,
2925
		       const struct ieee80211_tx_info *frame_txctl,
2926 2927 2928 2929
		       struct ieee80211_rts *rts)
{
	const struct ieee80211_hdr *hdr = frame;

2930 2931
	rts->frame_control =
	    cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
2932 2933
	rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
					       frame_txctl);
2934 2935 2936 2937 2938
	memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
	memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
}
EXPORT_SYMBOL(ieee80211_rts_get);

2939
void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
2940
			     const void *frame, size_t frame_len,
2941
			     const struct ieee80211_tx_info *frame_txctl,
2942 2943 2944 2945
			     struct ieee80211_cts *cts)
{
	const struct ieee80211_hdr *hdr = frame;

2946 2947
	cts->frame_control =
	    cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
2948 2949
	cts->duration = ieee80211_ctstoself_duration(hw, vif,
						     frame_len, frame_txctl);
2950 2951 2952 2953 2954
	memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
}
EXPORT_SYMBOL(ieee80211_ctstoself_get);

struct sk_buff *
2955
ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
2956
			  struct ieee80211_vif *vif)
2957 2958
{
	struct ieee80211_local *local = hw_to_local(hw);
2959
	struct sk_buff *skb = NULL;
2960
	struct ieee80211_tx_data tx;
2961
	struct ieee80211_sub_if_data *sdata;
2962
	struct ps_data *ps;
2963
	struct ieee80211_tx_info *info;
J
Johannes Berg 已提交
2964
	struct ieee80211_chanctx_conf *chanctx_conf;
2965

2966
	sdata = vif_to_sdata(vif);
2967 2968

	rcu_read_lock();
J
Johannes Berg 已提交
2969
	chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2970

2971 2972 2973 2974 2975 2976 2977 2978 2979 2980 2981
	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
2982 2983
	} else if (ieee80211_vif_is_mesh(&sdata->vif)) {
		ps = &sdata->u.mesh.ps;
2984
	} else {
2985
		goto out;
2986
	}
2987

2988
	if (ps->dtim_count != 0 || !ps->dtim_bc_mc)
2989
		goto out; /* send buffered bc/mc only after DTIM beacon */
2990

2991
	while (1) {
2992
		skb = skb_dequeue(&ps->bc_buf);
2993
		if (!skb)
2994
			goto out;
2995 2996
		local->total_ps_buffered--;

2997
		if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) {
2998 2999 3000 3001 3002 3003 3004 3005 3006
			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);
		}

3007
		if (sdata->vif.type == NL80211_IFTYPE_AP)
3008
			sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev);
J
Johannes Berg 已提交
3009
		if (!ieee80211_tx_prepare(sdata, &tx, skb))
3010 3011 3012
			break;
		dev_kfree_skb_any(skb);
	}
3013 3014 3015

	info = IEEE80211_SKB_CB(skb);

3016
	tx.flags |= IEEE80211_TX_PS_BUFFERED;
3017
	info->band = chanctx_conf->def.chan->band;
3018

3019
	if (invoke_tx_handlers(&tx))
3020
		skb = NULL;
3021
 out:
3022
	rcu_read_unlock();
3023 3024 3025 3026

	return skb;
}
EXPORT_SYMBOL(ieee80211_get_buffered_bc);
J
Johannes Berg 已提交
3027

J
Johannes Berg 已提交
3028 3029 3030
void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata,
				 struct sk_buff *skb, int tid,
				 enum ieee80211_band band)
J
Johannes Berg 已提交
3031
{
3032
	int ac = ieee802_1d_to_ac[tid & 7];
3033

J
Johannes Berg 已提交
3034 3035 3036 3037
	skb_set_mac_header(skb, 0);
	skb_set_network_header(skb, 0);
	skb_set_transport_header(skb, 0);

3038
	skb_set_queue_mapping(skb, ac);
3039
	skb->priority = tid;
3040

3041 3042
	skb->dev = sdata->dev;

3043 3044 3045 3046 3047 3048
	/*
	 * The other path calling ieee80211_xmit is from the tasklet,
	 * and while we can handle concurrent transmissions locking
	 * requirements are that we do not come into tx with bhs on.
	 */
	local_bh_disable();
J
Johannes Berg 已提交
3049
	ieee80211_xmit(sdata, skb, band);
3050
	local_bh_enable();
J
Johannes Berg 已提交
3051
}