tx.c 79.8 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 <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);
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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 (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;

	if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *)
					    skb->data))
		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) ||
		      test_sta_flag(sta, WLAN_STA_PS_DRIVER)) &&
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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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		/* only deauth, disassoc and action are bufferable MMPDUs */
		if (ieee80211_is_mgmt(hdr->frame_control) &&
		    !ieee80211_is_deauth(hdr->frame_control) &&
		    !ieee80211_is_disassoc(hdr->frame_control) &&
		    !ieee80211_is_action(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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		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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		skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb);
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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;
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	if (tx->flags & IEEE80211_TX_UNICAST)
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		return ieee80211_tx_h_unicast_ps_buf(tx);
	else
		return ieee80211_tx_h_multicast_ps_buf(tx);
}

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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);

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	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;
	}
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	return TX_CONTINUE;
}

551
static ieee80211_tx_result debug_noinline
552
ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
553
{
554
	struct ieee80211_key *key;
555
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
556
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
557

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558
	if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT))
559
		tx->key = NULL;
560 561
	else if (tx->sta &&
		 (key = rcu_dereference(tx->sta->ptk[tx->sta->ptk_idx])))
562
		tx->key = key;
563
	else if (ieee80211_is_mgmt(hdr->frame_control) &&
564 565
		 is_multicast_ether_addr(hdr->addr1) &&
		 ieee80211_is_robust_mgmt_frame(hdr) &&
566 567
		 (key = rcu_dereference(tx->sdata->default_mgmt_key)))
		tx->key = key;
568 569 570 571 572
	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)))
573
		tx->key = key;
574 575 576 577 578 579 580 581 582 583
	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;
	else if (ieee80211_is_robust_mgmt_frame(hdr) &&
		 !(ieee80211_is_action(hdr->frame_control) &&
		   tx->sta && test_sta_flag(tx->sta, WLAN_STA_MFP)))
		tx->key = NULL;
584 585 586
	else if (ieee80211_is_mgmt(hdr->frame_control) &&
		 !ieee80211_is_robust_mgmt_frame(hdr))
		tx->key = NULL;
587
	else {
588
		I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted);
589
		return TX_DROP;
590
	}
591 592

	if (tx->key) {
593 594
		bool skip_hw = false;

595
		tx->key->tx_rx_count++;
596
		/* TODO: add threshold stuff again */
597

598 599 600 601
		switch (tx->key->conf.cipher) {
		case WLAN_CIPHER_SUITE_WEP40:
		case WLAN_CIPHER_SUITE_WEP104:
		case WLAN_CIPHER_SUITE_TKIP:
602
			if (!ieee80211_is_data_present(hdr->frame_control))
603 604
				tx->key = NULL;
			break;
605
		case WLAN_CIPHER_SUITE_CCMP:
606 607 608 609
			if (!ieee80211_is_data_present(hdr->frame_control) &&
			    !ieee80211_use_mfp(hdr->frame_control, tx->sta,
					       tx->skb))
				tx->key = NULL;
610 611
			else
				skip_hw = (tx->key->conf.flags &
612
					   IEEE80211_KEY_FLAG_SW_MGMT_TX) &&
613
					ieee80211_is_mgmt(hdr->frame_control);
614
			break;
615
		case WLAN_CIPHER_SUITE_AES_CMAC:
616 617 618
			if (!ieee80211_is_mgmt(hdr->frame_control))
				tx->key = NULL;
			break;
619
		}
620

621 622
		if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED &&
			     !ieee80211_is_deauth(hdr->frame_control)))
623 624
			return TX_DROP;

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625
		if (!skip_hw && tx->key &&
J
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626
		    tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
627
			info->control.hw_key = &tx->key->conf;
628 629
	}

630
	return TX_CONTINUE;
631 632
}

633
static ieee80211_tx_result debug_noinline
634
ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
635
{
636
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
637 638
	struct ieee80211_hdr *hdr = (void *)tx->skb->data;
	struct ieee80211_supported_band *sband;
S
Shanyu Zhao 已提交
639
	u32 len;
640
	struct ieee80211_tx_rate_control txrc;
641
	struct ieee80211_sta_rates *ratetbl = NULL;
J
Johannes Berg 已提交
642
	bool assoc = false;
643

644
	memset(&txrc, 0, sizeof(txrc));
645

646
	sband = tx->local->hw.wiphy->bands[info->band];
647

S
Shanyu Zhao 已提交
648
	len = min_t(u32, tx->skb->len + FCS_LEN,
649
			 tx->local->hw.wiphy->frag_threshold);
650 651

	/* set up the tx rate control struct we give the RC algo */
J
Johannes Berg 已提交
652
	txrc.hw = &tx->local->hw;
653 654 655 656
	txrc.sband = sband;
	txrc.bss_conf = &tx->sdata->vif.bss_conf;
	txrc.skb = tx->skb;
	txrc.reported_rate.idx = -1;
657
	txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band];
658 659 660 661
	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;
662 663 664 665 666

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

667
	txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
668
		    tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT ||
669
		    tx->sdata->vif.type == NL80211_IFTYPE_ADHOC);
670 671

	/* set up RTS protection if desired */
672
	if (len > tx->local->hw.wiphy->rts_threshold) {
673
		txrc.rts = true;
674 675
	}

676
	info->control.use_rts = txrc.rts;
677 678
	info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot;

679 680 681 682 683 684 685 686
	/*
	 * 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
687
	     (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE))))
688 689 690
		txrc.short_preamble = true;

	info->control.short_preamble = txrc.short_preamble;
691

J
Johannes Berg 已提交
692 693
	if (tx->sta)
		assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
694 695 696 697 698

	/*
	 * 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
699
	if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc &&
700 701 702 703
		 !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",
704
		 tx->sdata->name, hdr->addr1,
705
		 info->band ? 5 : 2))
706
		return TX_DROP;
707

708 709 710 711
	/*
	 * If we're associated with the sta at this point we know we can at
	 * least send the frame at the lowest bit rate.
	 */
712 713
	rate_control_get_rate(tx->sdata, tx->sta, &txrc);

714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734
	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];
	}
735

736
	if (txrc.reported_rate.idx < 0) {
737
		txrc.reported_rate = tx->rate;
738 739 740
		if (tx->sta && ieee80211_is_data(hdr->frame_control))
			tx->sta->last_tx_rate = txrc.reported_rate;
	} else if (tx->sta)
741
		tx->sta->last_tx_rate = txrc.reported_rate;
742

743 744 745
	if (ratetbl)
		return TX_CONTINUE;

746 747
	if (unlikely(!info->control.rates[0].count))
		info->control.rates[0].count = 1;
748

749 750 751 752
	if (WARN_ON_ONCE((info->control.rates[0].count > 1) &&
			 (info->flags & IEEE80211_TX_CTL_NO_ACK)))
		info->control.rates[0].count = 1;

753 754 755
	return TX_CONTINUE;
}

756 757 758 759 760 761 762 763 764
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;

765 766 767 768 769
	/*
	 * 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.
	 */
770
	if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR))
771 772
		return TX_CONTINUE;

773 774 775 776 777 778
	if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
		return TX_CONTINUE;

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

779 780 781
	if (ieee80211_is_qos_nullfunc(hdr->frame_control))
		return TX_CONTINUE;

J
Johannes Berg 已提交
782 783 784
	/*
	 * Anything but QoS data that has a sequence number field
	 * (is long enough) gets a sequence number from the global
785 786
	 * 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
787
	 */
788 789
	if (!ieee80211_is_data_qos(hdr->frame_control) ||
	    is_multicast_ether_addr(hdr->addr1)) {
J
Johannes Berg 已提交
790
		/* driver should assign sequence number */
791
		info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
J
Johannes Berg 已提交
792 793 794
		/* 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;
795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819
		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;
}

820
static int ieee80211_fragment(struct ieee80211_tx_data *tx,
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821 822 823
			      struct sk_buff *skb, int hdrlen,
			      int frag_threshold)
{
824
	struct ieee80211_local *local = tx->local;
825
	struct ieee80211_tx_info *info;
826
	struct sk_buff *tmp;
J
Johannes Berg 已提交
827 828 829 830 831 832 833
	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;

834 835
	/* first fragment was already added to queue by caller */

J
Johannes Berg 已提交
836 837 838 839 840 841 842 843
	while (rem) {
		int fraglen = per_fragm;

		if (fraglen > rem)
			fraglen = rem;
		rem -= fraglen;
		tmp = dev_alloc_skb(local->tx_headroom +
				    frag_threshold +
844
				    tx->sdata->encrypt_headroom +
J
Johannes Berg 已提交
845 846 847
				    IEEE80211_ENCRYPT_TAILROOM);
		if (!tmp)
			return -ENOMEM;
848 849 850

		__skb_queue_tail(&tx->skbs, tmp);

851 852 853
		skb_reserve(tmp,
			    local->tx_headroom + tx->sdata->encrypt_headroom);

J
Johannes Berg 已提交
854 855
		/* copy control information */
		memcpy(tmp->cb, skb->cb, sizeof(tmp->cb));
856 857 858 859 860 861 862 863

		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
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864 865 866 867 868 869 870 871 872 873 874
		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;
	}

875
	/* adjust first fragment's length */
J
Johannes Berg 已提交
876 877 878 879
	skb->len = hdrlen + per_fragm;
	return 0;
}

880
static ieee80211_tx_result debug_noinline
881 882
ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
{
J
Johannes Berg 已提交
883 884 885
	struct sk_buff *skb = tx->skb;
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
	struct ieee80211_hdr *hdr = (void *)skb->data;
886
	int frag_threshold = tx->local->hw.wiphy->frag_threshold;
J
Johannes Berg 已提交
887 888
	int hdrlen;
	int fragnum;
889

890 891 892 893
	/* no matter what happens, tx->skb moves to tx->skbs */
	__skb_queue_tail(&tx->skbs, skb);
	tx->skb = NULL;

894 895 896 897
	if (info->flags & IEEE80211_TX_CTL_DONTFRAG)
		return TX_CONTINUE;

	if (tx->local->ops->set_frag_threshold)
898 899
		return TX_CONTINUE;

900 901
	/*
	 * Warn when submitting a fragmented A-MPDU frame and drop it.
J
Johannes Berg 已提交
902
	 * This scenario is handled in ieee80211_tx_prepare but extra
903
	 * caution taken here as fragmented ampdu may cause Tx stop.
904
	 */
S
Sujith 已提交
905
	if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
906 907
		return TX_DROP;

908
	hdrlen = ieee80211_hdrlen(hdr->frame_control);
909

910
	/* internal error, why isn't DONTFRAG set? */
911
	if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))
J
Johannes Berg 已提交
912
		return TX_DROP;
913

J
Johannes Berg 已提交
914 915 916 917 918 919 920 921
	/*
	 * 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.
	 */
922
	if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold))
J
Johannes Berg 已提交
923
		return TX_DROP;
924

J
Johannes Berg 已提交
925 926
	/* update duration/seq/flags of fragments */
	fragnum = 0;
927 928

	skb_queue_walk(&tx->skbs, skb) {
J
Johannes Berg 已提交
929
		const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
930

J
Johannes Berg 已提交
931 932
		hdr = (void *)skb->data;
		info = IEEE80211_SKB_CB(skb);
933

934
		if (!skb_queue_is_last(&tx->skbs, skb)) {
J
Johannes Berg 已提交
935
			hdr->frame_control |= morefrags;
936 937 938 939 940 941 942
			/*
			 * 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;
943
			BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4);
944
			info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
J
Johannes Berg 已提交
945 946
		} else {
			hdr->frame_control &= ~morefrags;
947
		}
J
Johannes Berg 已提交
948 949
		hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG);
		fragnum++;
950
	}
951

952
	return TX_CONTINUE;
953 954
}

955 956 957
static ieee80211_tx_result debug_noinline
ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
{
958
	struct sk_buff *skb;
959
	int ac = -1;
960 961 962 963

	if (!tx->sta)
		return TX_CONTINUE;

964
	skb_queue_walk(&tx->skbs, skb) {
965
		ac = skb_get_queue_mapping(skb);
966
		tx->sta->tx_fragments++;
967
		tx->sta->tx_bytes[ac] += skb->len;
968
	}
969 970
	if (ac >= 0)
		tx->sta->tx_packets[ac]++;
971 972 973 974

	return TX_CONTINUE;
}

975
static ieee80211_tx_result debug_noinline
976 977 978 979 980
ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
{
	if (!tx->key)
		return TX_CONTINUE;

981 982 983
	switch (tx->key->conf.cipher) {
	case WLAN_CIPHER_SUITE_WEP40:
	case WLAN_CIPHER_SUITE_WEP104:
984
		return ieee80211_crypto_wep_encrypt(tx);
985
	case WLAN_CIPHER_SUITE_TKIP:
986
		return ieee80211_crypto_tkip_encrypt(tx);
987
	case WLAN_CIPHER_SUITE_CCMP:
988
		return ieee80211_crypto_ccmp_encrypt(tx);
989
	case WLAN_CIPHER_SUITE_AES_CMAC:
990
		return ieee80211_crypto_aes_cmac_encrypt(tx);
991
	default:
992
		return ieee80211_crypto_hw_encrypt(tx);
993 994 995 996 997
	}

	return TX_DROP;
}

998
static ieee80211_tx_result debug_noinline
J
Johannes Berg 已提交
999 1000
ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
{
1001
	struct sk_buff *skb;
J
Johannes Berg 已提交
1002 1003 1004
	struct ieee80211_hdr *hdr;
	int next_len;
	bool group_addr;
J
Johannes Berg 已提交
1005

1006
	skb_queue_walk(&tx->skbs, skb) {
J
Johannes Berg 已提交
1007
		hdr = (void *) skb->data;
1008 1009
		if (unlikely(ieee80211_is_pspoll(hdr->frame_control)))
			break; /* must not overwrite AID */
1010 1011 1012 1013 1014
		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
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1015
		group_addr = is_multicast_ether_addr(hdr->addr1);
J
Johannes Berg 已提交
1016

J
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1017
		hdr->duration_id =
1018 1019
			ieee80211_duration(tx, skb, group_addr, next_len);
	}
J
Johannes Berg 已提交
1020 1021 1022 1023

	return TX_CONTINUE;
}

1024 1025
/* actual transmit path */

1026 1027 1028 1029 1030 1031 1032
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;
1033
	bool reset_agg_timer = false;
1034
	struct sk_buff *purge_skb = NULL;
1035 1036 1037

	if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
		info->flags |= IEEE80211_TX_CTL_AMPDU;
1038
		reset_agg_timer = true;
1039 1040 1041 1042 1043
	} 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
		 */
1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063
	} 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.
		 */
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1064
		tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid);
1065 1066 1067 1068 1069

		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;
1070
			reset_agg_timer = true;
1071 1072 1073 1074 1075
		} else {
			queued = true;
			info->control.vif = &tx->sdata->vif;
			info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
			__skb_queue_tail(&tid_tx->pending, skb);
1076 1077
			if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER)
				purge_skb = __skb_dequeue(&tid_tx->pending);
1078 1079
		}
		spin_unlock(&tx->sta->lock);
1080 1081

		if (purge_skb)
1082
			ieee80211_free_txskb(&tx->local->hw, purge_skb);
1083 1084
	}

1085 1086
	/* reset session timer */
	if (reset_agg_timer && tid_tx->timeout)
1087
		tid_tx->last_tx = jiffies;
1088

1089 1090 1091
	return queued;
}

1092 1093 1094
/*
 * initialises @tx
 */
1095
static ieee80211_tx_result
J
Johannes Berg 已提交
1096 1097 1098
ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
		     struct ieee80211_tx_data *tx,
		     struct sk_buff *skb)
1099
{
J
Johannes Berg 已提交
1100
	struct ieee80211_local *local = sdata->local;
1101
	struct ieee80211_hdr *hdr;
1102
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
J
Johannes Berg 已提交
1103
	int tid;
1104
	u8 *qc;
1105 1106 1107 1108

	memset(tx, 0, sizeof(*tx));
	tx->skb = skb;
	tx->local = local;
J
Johannes Berg 已提交
1109
	tx->sdata = sdata;
1110
	__skb_queue_head_init(&tx->skbs);
1111

1112 1113 1114 1115 1116 1117 1118
	/*
	 * 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;

1119 1120
	hdr = (struct ieee80211_hdr *) skb->data;

1121
	if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1122
		tx->sta = rcu_dereference(sdata->u.vlan.sta);
1123 1124
		if (!tx->sta && sdata->dev->ieee80211_ptr->use_4addr)
			return TX_DROP;
1125 1126
	} else if (info->flags & (IEEE80211_TX_CTL_INJECTED |
				  IEEE80211_TX_INTFL_NL80211_FRAME_TX) ||
1127
		   tx->sdata->control_port_protocol == tx->skb->protocol) {
1128
		tx->sta = sta_info_get_bss(sdata, hdr->addr1);
1129
	}
1130
	if (!tx->sta)
1131
		tx->sta = sta_info_get(sdata, hdr->addr1);
1132

1133
	if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) &&
1134
	    !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
1135 1136
	    (local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION) &&
	    !(local->hw.flags & IEEE80211_HW_TX_AMPDU_SETUP_IN_HW)) {
1137 1138
		struct tid_ampdu_tx *tid_tx;

S
Sujith 已提交
1139 1140 1141
		qc = ieee80211_get_qos_ctl(hdr);
		tid = *qc & IEEE80211_QOS_CTL_TID_MASK;

1142 1143 1144
		tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
		if (tid_tx) {
			bool queued;
1145

1146 1147 1148 1149 1150 1151
			queued = ieee80211_tx_prep_agg(tx, skb, info,
						       tid_tx, tid);

			if (unlikely(queued))
				return TX_QUEUED;
		}
S
Sujith 已提交
1152 1153
	}

1154
	if (is_multicast_ether_addr(hdr->addr1)) {
1155
		tx->flags &= ~IEEE80211_TX_UNICAST;
1156
		info->flags |= IEEE80211_TX_CTL_NO_ACK;
1157
	} else
1158
		tx->flags |= IEEE80211_TX_UNICAST;
1159

1160 1161 1162 1163 1164
	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;
1165 1166
	}

1167
	if (!tx->sta)
1168
		info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
J
Johannes Berg 已提交
1169
	else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT))
1170
		info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1171

1172
	info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
1173

1174
	return TX_CONTINUE;
1175 1176
}

1177 1178 1179 1180 1181
static bool ieee80211_tx_frags(struct ieee80211_local *local,
			       struct ieee80211_vif *vif,
			       struct ieee80211_sta *sta,
			       struct sk_buff_head *skbs,
			       bool txpending)
1182
{
1183
	struct ieee80211_tx_control control;
1184
	struct sk_buff *skb, *tmp;
J
Johannes Berg 已提交
1185
	unsigned long flags;
1186

1187
	skb_queue_walk_safe(skbs, skb, tmp) {
1188 1189 1190 1191 1192 1193
		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);
1194
			ieee80211_free_txskb(&local->hw, skb);
1195 1196 1197
			continue;
		}
#endif
J
Johannes Berg 已提交
1198 1199 1200

		spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
		if (local->queue_stop_reasons[q] ||
1201
		    (!txpending && !skb_queue_empty(&local->pending[q]))) {
1202
			if (unlikely(info->flags &
1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220
				     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 {

1221
				/*
1222 1223 1224
				 * Since queue is stopped, queue up frames for
				 * later transmission from the tx-pending
				 * tasklet when the queue is woken again.
1225
				 */
1226 1227 1228 1229 1230 1231 1232 1233 1234 1235
				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;
1236
			}
1237
		}
J
Johannes Berg 已提交
1238
		spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1239

1240
		info->control.vif = vif;
1241
		control.sta = sta;
1242

1243
		__skb_unlink(skb, skbs);
1244
		drv_tx(local, &control, skb);
1245
	}
1246

1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263
	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;
1264

1265 1266
	if (WARN_ON(skb_queue_empty(skbs)))
		return true;
J
Johannes Berg 已提交
1267

1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281
	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:
1282 1283 1284 1285
		if (sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE) {
			vif = &sdata->vif;
			break;
		}
1286
		sdata = rcu_dereference(local->monitor_sdata);
1287
		if (sdata) {
1288
			vif = &sdata->vif;
1289 1290 1291 1292 1293 1294
			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
1295
			vif = NULL;
1296 1297 1298 1299 1300 1301 1302 1303
		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;
1304
	}
J
Johannes Berg 已提交
1305

1306 1307
	result = ieee80211_tx_frags(local, vif, pubsta, skbs,
				    txpending);
1308

1309 1310
	ieee80211_tpt_led_trig_tx(local, fc, led_len);

J
Johannes Berg 已提交
1311
	WARN_ON_ONCE(!skb_queue_empty(skbs));
1312

1313
	return result;
1314 1315
}

1316 1317 1318 1319 1320 1321
/*
 * 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)
{
1322
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
1323 1324
	ieee80211_tx_result res = TX_DROP;

1325 1326 1327 1328 1329 1330 1331
#define CALL_TXH(txh) \
	do {				\
		res = txh(tx);		\
		if (res != TX_CONTINUE)	\
			goto txh_done;	\
	} while (0)

1332
	CALL_TXH(ieee80211_tx_h_dynamic_ps);
1333 1334
	CALL_TXH(ieee80211_tx_h_check_assoc);
	CALL_TXH(ieee80211_tx_h_ps_buf);
1335
	CALL_TXH(ieee80211_tx_h_check_control_port_protocol);
1336
	CALL_TXH(ieee80211_tx_h_select_key);
1337 1338
	if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
		CALL_TXH(ieee80211_tx_h_rate_ctrl);
1339

J
Johannes Berg 已提交
1340 1341 1342
	if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) {
		__skb_queue_tail(&tx->skbs, tx->skb);
		tx->skb = NULL;
1343
		goto txh_done;
J
Johannes Berg 已提交
1344
	}
1345 1346

	CALL_TXH(ieee80211_tx_h_michael_mic_add);
1347 1348
	CALL_TXH(ieee80211_tx_h_sequence);
	CALL_TXH(ieee80211_tx_h_fragment);
1349
	/* handlers after fragment must be aware of tx info fragmentation! */
1350 1351
	CALL_TXH(ieee80211_tx_h_stats);
	CALL_TXH(ieee80211_tx_h_encrypt);
1352 1353
	if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
		CALL_TXH(ieee80211_tx_h_calculate_duration);
1354
#undef CALL_TXH
1355

1356
 txh_done:
1357
	if (unlikely(res == TX_DROP)) {
1358
		I802_DEBUG_INC(tx->local->tx_handlers_drop);
1359
		if (tx->skb)
1360
			ieee80211_free_txskb(&tx->local->hw, tx->skb);
1361
		else
1362
			ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs);
1363 1364
		return -1;
	} else if (unlikely(res == TX_QUEUED)) {
1365
		I802_DEBUG_INC(tx->local->tx_handlers_queued);
1366 1367 1368 1369 1370 1371
		return -1;
	}

	return 0;
}

1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400
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);

1401 1402 1403 1404
/*
 * 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
1405 1406
			 struct sk_buff *skb, bool txpending,
			 enum ieee80211_band band)
1407
{
J
Johannes Berg 已提交
1408
	struct ieee80211_local *local = sdata->local;
1409
	struct ieee80211_tx_data tx;
1410
	ieee80211_tx_result res_prepare;
1411
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1412
	bool result = true;
1413
	int led_len;
1414 1415 1416

	if (unlikely(skb->len < 10)) {
		dev_kfree_skb(skb);
1417
		return true;
1418 1419
	}

1420
	/* initialises tx */
1421
	led_len = skb->len;
J
Johannes Berg 已提交
1422
	res_prepare = ieee80211_tx_prepare(sdata, &tx, skb);
1423

1424
	if (unlikely(res_prepare == TX_DROP)) {
1425
		ieee80211_free_txskb(&local->hw, skb);
J
Johannes Berg 已提交
1426
		return true;
1427
	} else if (unlikely(res_prepare == TX_QUEUED)) {
J
Johannes Berg 已提交
1428
		return true;
1429 1430
	}

J
Johannes Berg 已提交
1431
	info->band = band;
1432

1433 1434 1435 1436 1437 1438
	/* 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)];

1439
	if (!invoke_tx_handlers(&tx))
1440 1441
		result = __ieee80211_tx(local, &tx.skbs, led_len,
					tx.sta, txpending);
J
Johannes Berg 已提交
1442

1443
	return result;
1444 1445 1446 1447
}

/* device xmit handlers */

1448
static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata,
1449 1450 1451
				struct sk_buff *skb,
				int head_need, bool may_encrypt)
{
1452
	struct ieee80211_local *local = sdata->local;
1453 1454
	int tail_need = 0;

1455
	if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) {
1456 1457 1458 1459 1460
		tail_need = IEEE80211_ENCRYPT_TAILROOM;
		tail_need -= skb_tailroom(skb);
		tail_need = max_t(int, tail_need, 0);
	}

1461
	if (skb_cloned(skb))
1462
		I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1463
	else if (head_need || tail_need)
1464
		I802_DEBUG_INC(local->tx_expand_skb_head);
1465 1466
	else
		return 0;
1467 1468

	if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
J
Joe Perches 已提交
1469 1470
		wiphy_debug(local->hw.wiphy,
			    "failed to reallocate TX buffer\n");
1471 1472 1473 1474 1475 1476
		return -ENOMEM;
	}

	return 0;
}

J
Johannes Berg 已提交
1477 1478
void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
		    enum ieee80211_band band)
1479
{
J
Johannes Berg 已提交
1480
	struct ieee80211_local *local = sdata->local;
1481
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1482
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1483
	int headroom;
1484
	bool may_encrypt;
1485

J
Johannes Berg 已提交
1486
	may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT);
1487

J
Johannes Berg 已提交
1488
	headroom = local->tx_headroom;
1489
	if (may_encrypt)
1490
		headroom += sdata->encrypt_headroom;
1491 1492 1493
	headroom -= skb_headroom(skb);
	headroom = max_t(int, 0, headroom);

1494
	if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) {
1495
		ieee80211_free_txskb(&local->hw, skb);
J
Johannes Berg 已提交
1496
		return;
1497 1498
	}

1499
	hdr = (struct ieee80211_hdr *) skb->data;
1500
	info->control.vif = &sdata->vif;
1501

M
Marco Porsch 已提交
1502 1503 1504
	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
1505
			if (mesh_nexthop_resolve(sdata, skb))
M
Marco Porsch 已提交
1506 1507 1508 1509
				return; /* skb queued: don't free */
		} else {
			ieee80211_mps_set_frame_flags(sdata, NULL, hdr);
		}
1510
	}
1511

1512
	ieee80211_set_qos_hdr(sdata, skb);
J
Johannes Berg 已提交
1513
	ieee80211_tx(sdata, skb, false, band);
1514 1515
}

1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 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
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;
}

1599 1600
netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
					 struct net_device *dev)
1601 1602
{
	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
J
Johannes Berg 已提交
1603 1604
	struct ieee80211_chanctx_conf *chanctx_conf;
	struct ieee80211_channel *chan;
1605 1606
	struct ieee80211_radiotap_header *prthdr =
		(struct ieee80211_radiotap_header *)skb->data;
J
Johannes Berg 已提交
1607
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1608
	struct ieee80211_hdr *hdr;
J
Johannes Berg 已提交
1609
	struct ieee80211_sub_if_data *tmp_sdata, *sdata;
1610
	u16 len_rthdr;
J
Johannes Berg 已提交
1611
	int hdrlen;
1612

1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626
	/* 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 */
1627 1628 1629 1630 1631 1632 1633

	/*
	 * 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
	 */
1634
	skb_set_mac_header(skb, len_rthdr);
1635
	/*
1636 1637
	 * 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
1638
	 */
1639 1640
	skb_set_network_header(skb, len_rthdr);
	skb_set_transport_header(skb, len_rthdr);
1641

J
Johannes Berg 已提交
1642 1643 1644 1645 1646 1647 1648 1649 1650
	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;

1651 1652 1653 1654
	/*
	 * Initialize skb->protocol if the injected frame is a data frame
	 * carrying a rfc1042 header
	 */
J
Johannes Berg 已提交
1655 1656 1657 1658
	if (ieee80211_is_data(hdr->frame_control) &&
	    skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) {
		u8 *payload = (u8 *)hdr + hdrlen;

1659
		if (ether_addr_equal(payload, rfc1042_header))
J
Johannes Berg 已提交
1660 1661
			skb->protocol = cpu_to_be16((payload[6] << 8) |
						    payload[7]);
1662 1663
	}

J
Johannes Berg 已提交
1664 1665
	memset(info, 0, sizeof(*info));

J
Johannes Berg 已提交
1666
	info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
1667 1668 1669 1670 1671
		      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
1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691

	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;
1692
		if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) {
J
Johannes Berg 已提交
1693 1694 1695 1696
			sdata = tmp_sdata;
			break;
		}
	}
1697

J
Johannes Berg 已提交
1698 1699 1700 1701 1702 1703 1704 1705
	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);
	}

1706 1707 1708
	if (chanctx_conf)
		chan = chanctx_conf->def.chan;
	else if (!local->use_chanctx)
1709
		chan = local->_oper_chandef.chan;
1710 1711
	else
		goto fail_rcu;
J
Johannes Berg 已提交
1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728

	/*
	 * 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.
	 */
1729
	if ((chan->flags & (IEEE80211_CHAN_NO_IR | IEEE80211_CHAN_RADAR)))
J
Johannes Berg 已提交
1730 1731 1732
		goto fail_rcu;

	ieee80211_xmit(sdata, skb, chan->band);
J
Johannes Berg 已提交
1733 1734
	rcu_read_unlock();

1735
	return NETDEV_TX_OK;
1736

J
Johannes Berg 已提交
1737 1738
fail_rcu:
	rcu_read_unlock();
1739 1740 1741
fail:
	dev_kfree_skb(skb);
	return NETDEV_TX_OK; /* meaning, we dealt with the skb */
1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758
}

/**
 * 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).
 */
1759 1760
netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
				    struct net_device *dev)
1761
{
1762 1763
	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
	struct ieee80211_local *local = sdata->local;
1764
	struct ieee80211_tx_info *info;
1765
	int head_need;
1766 1767
	u16 ethertype, hdrlen,  meshhdrlen = 0;
	__le16 fc;
1768
	struct ieee80211_hdr hdr;
1769
	struct ieee80211s_hdr mesh_hdr __maybe_unused;
1770
	struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL;
1771 1772
	const u8 *encaps_data;
	int encaps_len, skip_header_bytes;
1773
	int nh_pos, h_pos;
1774
	struct sta_info *sta = NULL;
J
Johannes Berg 已提交
1775
	bool wme_sta = false, authorized = false, tdls_auth = false;
1776
	bool tdls_direct = false;
J
Johannes Berg 已提交
1777 1778 1779
	bool multicast;
	u32 info_flags = 0;
	u16 info_id = 0;
J
Johannes Berg 已提交
1780 1781 1782
	struct ieee80211_chanctx_conf *chanctx_conf;
	struct ieee80211_sub_if_data *ap_sdata;
	enum ieee80211_band band;
1783

1784
	if (unlikely(skb->len < ETH_HLEN))
1785 1786 1787 1788 1789
		goto fail;

	/* convert Ethernet header to proper 802.11 header (based on
	 * operation mode) */
	ethertype = (skb->data[12] << 8) | skb->data[13];
1790
	fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
1791

J
Johannes Berg 已提交
1792 1793
	rcu_read_lock();

1794
	switch (sdata->vif.type) {
1795
	case NL80211_IFTYPE_AP_VLAN:
1796
		sta = rcu_dereference(sdata->u.vlan.sta);
1797 1798 1799 1800
		if (sta) {
			fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
			/* RA TA DA SA */
			memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN);
1801
			memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1802 1803 1804
			memcpy(hdr.addr3, skb->data, ETH_ALEN);
			memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
			hdrlen = 30;
J
Johannes Berg 已提交
1805 1806
			authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
			wme_sta = test_sta_flag(sta, WLAN_STA_WME);
1807
		}
J
Johannes Berg 已提交
1808 1809 1810 1811 1812
		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;
1813
		band = chanctx_conf->def.chan->band;
1814 1815 1816 1817
		if (sta)
			break;
		/* fall through */
	case NL80211_IFTYPE_AP:
A
Arnd Bergmann 已提交
1818 1819 1820 1821
		if (sdata->vif.type == NL80211_IFTYPE_AP)
			chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
		if (!chanctx_conf)
			goto fail_rcu;
1822
		fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
1823 1824
		/* DA BSSID SA */
		memcpy(hdr.addr1, skb->data, ETH_ALEN);
1825
		memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1826 1827
		memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
		hdrlen = 24;
1828
		band = chanctx_conf->def.chan->band;
1829
		break;
1830
	case NL80211_IFTYPE_WDS:
1831
		fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1832 1833
		/* RA TA DA SA */
		memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
1834
		memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1835 1836 1837
		memcpy(hdr.addr3, skb->data, ETH_ALEN);
		memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
		hdrlen = 30;
J
Johannes Berg 已提交
1838 1839 1840 1841
		/*
		 * This is the exception! WDS style interfaces are prohibited
		 * when channel contexts are in used so this must be valid
		 */
1842
		band = local->hw.conf.chandef.chan->band;
1843
		break;
1844
#ifdef CONFIG_MAC80211_MESH
1845
	case NL80211_IFTYPE_MESH_POINT:
1846
		if (!is_multicast_ether_addr(skb->data)) {
1847 1848 1849
			struct sta_info *next_hop;
			bool mpp_lookup = true;

J
Johannes Berg 已提交
1850
			mpath = mesh_path_lookup(sdata, skb->data);
1851 1852 1853 1854 1855 1856 1857 1858 1859 1860
			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
1861
				mppath = mpp_path_lookup(sdata, skb->data);
1862 1863 1864

			if (mppath && mpath)
				mesh_path_del(mpath->sdata, mpath->dst);
1865
		}
1866

1867
		/*
1868 1869 1870 1871
		 * 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)
1872
		 */
1873 1874
		if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) &&
		    !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) {
1875 1876
			hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
					skb->data, skb->data + ETH_ALEN);
J
Johannes Berg 已提交
1877 1878
			meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr,
							       NULL, NULL);
1879
		} else {
1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891
			/* 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;
1892

1893
			hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
1894
					mesh_da, sdata->vif.addr);
1895 1896
			if (is_multicast_ether_addr(mesh_da))
				/* DA TA mSA AE:SA */
J
Johannes Berg 已提交
1897 1898 1899
				meshhdrlen = ieee80211_new_mesh_header(
						sdata, &mesh_hdr,
						skb->data + ETH_ALEN, NULL);
1900
			else
1901
				/* RA TA mDA mSA AE:DA SA */
J
Johannes Berg 已提交
1902 1903 1904
				meshhdrlen = ieee80211_new_mesh_header(
						sdata, &mesh_hdr, skb->data,
						skb->data + ETH_ALEN);
1905 1906

		}
J
Johannes Berg 已提交
1907 1908 1909
		chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
		if (!chanctx_conf)
			goto fail_rcu;
1910
		band = chanctx_conf->def.chan->band;
1911 1912
		break;
#endif
1913
	case NL80211_IFTYPE_STATION:
1914
		if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
J
Johannes Berg 已提交
1915 1916
			bool tdls_peer = false;

1917
			sta = sta_info_get(sdata, skb->data);
J
Johannes Berg 已提交
1918 1919 1920 1921 1922 1923 1924 1925 1926
			if (sta) {
				authorized = test_sta_flag(sta,
							WLAN_STA_AUTHORIZED);
				wme_sta = test_sta_flag(sta, WLAN_STA_WME);
				tdls_peer = test_sta_flag(sta,
							 WLAN_STA_TDLS_PEER);
				tdls_auth = test_sta_flag(sta,
						WLAN_STA_TDLS_PEER_AUTH);
			}
1927 1928 1929 1930 1931 1932

			/*
			 * If the TDLS link is enabled, send everything
			 * directly. Otherwise, allow TDLS setup frames
			 * to be transmitted indirectly.
			 */
J
Johannes Berg 已提交
1933
			tdls_direct = tdls_peer && (tdls_auth ||
1934 1935 1936 1937 1938 1939
				 !(ethertype == ETH_P_TDLS && skb->len > 14 &&
				   skb->data[14] == WLAN_TDLS_SNAP_RFTYPE));
		}

		if (tdls_direct) {
			/* link during setup - throw out frames to peer */
1940
			if (!tdls_auth)
J
Johannes Berg 已提交
1941
				goto fail_rcu;
1942 1943 1944 1945 1946 1947 1948 1949 1950 1951

			/* 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);
1952
			/* RA TA DA SA */
1953
			memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
1954
			memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1955 1956 1957 1958 1959 1960
			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 */
1961
			memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
1962 1963 1964 1965
			memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
			memcpy(hdr.addr3, skb->data, ETH_ALEN);
			hdrlen = 24;
		}
J
Johannes Berg 已提交
1966 1967 1968
		chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
		if (!chanctx_conf)
			goto fail_rcu;
1969
		band = chanctx_conf->def.chan->band;
1970
		break;
1971
	case NL80211_IFTYPE_ADHOC:
1972 1973 1974
		/* DA SA BSSID */
		memcpy(hdr.addr1, skb->data, ETH_ALEN);
		memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1975
		memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN);
1976
		hdrlen = 24;
J
Johannes Berg 已提交
1977 1978 1979
		chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
		if (!chanctx_conf)
			goto fail_rcu;
1980
		band = chanctx_conf->def.chan->band;
1981 1982
		break;
	default:
J
Johannes Berg 已提交
1983
		goto fail_rcu;
1984 1985
	}

1986 1987 1988 1989 1990
	/*
	 * 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
1991 1992
	multicast = is_multicast_ether_addr(hdr.addr1);
	if (!multicast) {
1993
		sta = sta_info_get(sdata, hdr.addr1);
J
Johannes Berg 已提交
1994 1995 1996 1997
		if (sta) {
			authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
			wme_sta = test_sta_flag(sta, WLAN_STA_WME);
		}
1998 1999
	}

2000 2001
	/* For mesh, the use of the QoS header is mandatory */
	if (ieee80211_vif_is_mesh(&sdata->vif))
J
Johannes Berg 已提交
2002
		wme_sta = true;
2003

2004
	/* receiver and we are QoS enabled, use a QoS type frame */
J
Johannes Berg 已提交
2005
	if (wme_sta && local->hw.queues >= IEEE80211_NUM_ACS) {
2006
		fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
2007 2008 2009 2010
		hdrlen += 2;
	}

	/*
2011 2012
	 * Drop unicast frames to unauthorised stations unless they are
	 * EAPOL frames from the local station.
2013
	 */
2014
	if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) &&
2015
		     !multicast && !authorized &&
2016
		     (cpu_to_be16(ethertype) != sdata->control_port_protocol ||
2017
		      !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) {
2018
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
J
Johannes Berg 已提交
2019
		net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n",
2020
				    dev->name, hdr.addr1);
2021 2022 2023 2024
#endif

		I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);

J
Johannes Berg 已提交
2025
		goto fail_rcu;
2026 2027
	}

J
Johannes Berg 已提交
2028 2029 2030 2031 2032 2033 2034
	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
2035
			int id;
J
Johannes Berg 已提交
2036 2037

			spin_lock_irqsave(&local->ack_status_lock, flags);
T
Tejun Heo 已提交
2038 2039
			id = idr_alloc(&local->ack_status_frames, orig_skb,
				       1, 0x10000, GFP_ATOMIC);
J
Johannes Berg 已提交
2040 2041
			spin_unlock_irqrestore(&local->ack_status_lock, flags);

T
Tejun Heo 已提交
2042
			if (id >= 0) {
J
Johannes Berg 已提交
2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056
				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;
		}
	}

2057 2058 2059 2060
	/*
	 * If the skb is shared we need to obtain our own copy.
	 */
	if (skb_shared(skb)) {
J
Johannes Berg 已提交
2061 2062 2063 2064 2065
		struct sk_buff *tmp_skb = skb;

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

2066
		skb = skb_clone(skb, GFP_ATOMIC);
2067 2068
		kfree_skb(tmp_skb);

2069
		if (!skb)
J
Johannes Berg 已提交
2070
			goto fail_rcu;
2071 2072
	}

2073
	hdr.frame_control = fc;
2074 2075 2076 2077 2078 2079 2080 2081
	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
2082
	} else if (ethertype >= ETH_P_802_3_MIN) {
2083 2084 2085 2086 2087 2088 2089 2090
		encaps_data = rfc1042_header;
		encaps_len = sizeof(rfc1042_header);
		skip_header_bytes -= 2;
	} else {
		encaps_data = NULL;
		encaps_len = 0;
	}

2091 2092 2093
	nh_pos = skb_network_header(skb) - skb->data;
	h_pos = skb_transport_header(skb) - skb->data;

2094 2095 2096 2097
	skb_pull(skb, skip_header_bytes);
	nh_pos -= skip_header_bytes;
	h_pos -= skip_header_bytes;

2098
	head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
2099

2100 2101 2102 2103 2104 2105 2106 2107 2108 2109 2110
	/*
	 * 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.
	 */
2111

2112
	if (head_need > 0 || skb_cloned(skb)) {
2113
		head_need += sdata->encrypt_headroom;
2114 2115
		head_need += local->tx_headroom;
		head_need = max_t(int, 0, head_need);
2116 2117
		if (ieee80211_skb_resize(sdata, skb, head_need, true)) {
			ieee80211_free_txskb(&local->hw, skb);
J
Johannes Berg 已提交
2118
			skb = NULL;
J
Johannes Berg 已提交
2119
			goto fail_rcu;
2120
		}
2121 2122 2123 2124 2125 2126 2127
	}

	if (encaps_data) {
		memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
		nh_pos += encaps_len;
		h_pos += encaps_len;
	}
2128

2129
#ifdef CONFIG_MAC80211_MESH
2130 2131 2132 2133 2134
	if (meshhdrlen > 0) {
		memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
		nh_pos += meshhdrlen;
		h_pos += meshhdrlen;
	}
2135
#endif
2136

2137
	if (ieee80211_is_data_qos(fc)) {
2138 2139 2140 2141 2142 2143 2144 2145 2146 2147 2148 2149
		__le16 *qos_control;

		qos_control = (__le16*) skb_push(skb, 2);
		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);

2150 2151 2152
	nh_pos += hdrlen;
	h_pos += hdrlen;

2153 2154
	dev->stats.tx_packets++;
	dev->stats.tx_bytes += skb->len;
2155 2156 2157 2158 2159 2160 2161 2162

	/* 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);

2163
	info = IEEE80211_SKB_CB(skb);
J
Johannes Berg 已提交
2164 2165
	memset(info, 0, sizeof(*info));

2166
	dev->trans_start = jiffies;
J
Johannes Berg 已提交
2167 2168 2169 2170

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

J
Johannes Berg 已提交
2171 2172
	ieee80211_xmit(sdata, skb, band);
	rcu_read_unlock();
2173

2174
	return NETDEV_TX_OK;
2175

J
Johannes Berg 已提交
2176 2177
 fail_rcu:
	rcu_read_unlock();
2178
 fail:
2179 2180
	dev_kfree_skb(skb);
	return NETDEV_TX_OK;
2181 2182 2183
}


2184 2185 2186 2187
/*
 * ieee80211_clear_tx_pending may not be called in a context where
 * it is possible that it packets could come in again.
 */
2188 2189
void ieee80211_clear_tx_pending(struct ieee80211_local *local)
{
2190
	struct sk_buff *skb;
J
Johannes Berg 已提交
2191
	int i;
2192

2193 2194 2195 2196
	for (i = 0; i < local->hw.queues; i++) {
		while ((skb = skb_dequeue(&local->pending[i])) != NULL)
			ieee80211_free_txskb(&local->hw, skb);
	}
2197 2198
}

2199 2200 2201 2202 2203
/*
 * 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.
 */
2204 2205 2206 2207 2208 2209 2210
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;
2211
	bool result;
J
Johannes Berg 已提交
2212
	struct ieee80211_chanctx_conf *chanctx_conf;
2213

2214
	sdata = vif_to_sdata(info->control.vif);
2215 2216

	if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) {
J
Johannes Berg 已提交
2217 2218 2219 2220 2221 2222
		chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
		if (unlikely(!chanctx_conf)) {
			dev_kfree_skb(skb);
			return true;
		}
		result = ieee80211_tx(sdata, skb, true,
2223
				      chanctx_conf->def.chan->band);
2224
	} else {
2225 2226 2227 2228 2229
		struct sk_buff_head skbs;

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

2230
		hdr = (struct ieee80211_hdr *)skb->data;
2231
		sta = sta_info_get(sdata, hdr->addr1);
2232

2233
		result = __ieee80211_tx(local, &skbs, skb->len, sta, true);
2234 2235 2236 2237 2238
	}

	return result;
}

2239
/*
J
Johannes Berg 已提交
2240
 * Transmit all pending packets. Called from tasklet.
2241
 */
2242 2243 2244
void ieee80211_tx_pending(unsigned long data)
{
	struct ieee80211_local *local = (struct ieee80211_local *)data;
2245
	unsigned long flags;
2246
	int i;
J
Johannes Berg 已提交
2247
	bool txok;
2248

2249
	rcu_read_lock();
2250

J
Johannes Berg 已提交
2251
	spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
2252 2253 2254 2255 2256
	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
2257
		if (local->queue_stop_reasons[i] ||
2258
		    skb_queue_empty(&local->pending[i]))
2259
			continue;
2260

2261
		while (!skb_queue_empty(&local->pending[i])) {
J
Johannes Berg 已提交
2262
			struct sk_buff *skb = __skb_dequeue(&local->pending[i]);
2263 2264
			struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);

2265
			if (WARN_ON(!info->control.vif)) {
2266
				ieee80211_free_txskb(&local->hw, skb);
2267 2268 2269
				continue;
			}

J
Johannes Berg 已提交
2270 2271 2272 2273 2274 2275 2276
			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)
2277
				break;
2278
		}
2279 2280

		if (skb_queue_empty(&local->pending[i]))
2281
			ieee80211_propagate_queue_wake(local, i);
2282
	}
J
Johannes Berg 已提交
2283
	spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
2284

2285
	rcu_read_unlock();
2286 2287 2288 2289
}

/* functions for drivers to get certain frames */

2290 2291
static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
				       struct ps_data *ps, struct sk_buff *skb)
2292 2293 2294 2295 2296 2297 2298
{
	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. */
2299
	if (atomic_read(&ps->num_sta_ps) > 0)
2300 2301
		/* in the hope that this is faster than
		 * checking byte-for-byte */
2302
		have_bits = !bitmap_empty((unsigned long*)ps->tim,
2303 2304
					  IEEE80211_MAX_AID+1);

2305 2306
	if (ps->dtim_count == 0)
		ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1;
2307
	else
2308
		ps->dtim_count--;
2309 2310 2311 2312

	tim = pos = (u8 *) skb_put(skb, 6);
	*pos++ = WLAN_EID_TIM;
	*pos++ = 4;
2313
	*pos++ = ps->dtim_count;
2314
	*pos++ = sdata->vif.bss_conf.dtim_period;
2315

2316
	if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf))
2317 2318
		aid0 = 1;

2319
	ps->dtim_bc_mc = aid0 == 1;
2320

2321 2322 2323 2324 2325 2326
	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++) {
2327
			if (ps->tim[i]) {
2328 2329 2330 2331 2332 2333
				n1 = i & 0xfe;
				break;
			}
		}
		n2 = n1;
		for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
2334
			if (ps->tim[i]) {
2335 2336 2337 2338 2339 2340 2341 2342
				n2 = i;
				break;
			}
		}

		/* Bitmap control */
		*pos++ = n1 | aid0;
		/* Part Virt Bitmap */
2343
		skb_put(skb, n2 - n1);
2344
		memcpy(pos, ps->tim + n1, n2 - n1 + 1);
2345 2346 2347 2348 2349 2350 2351 2352

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

2353 2354 2355 2356 2357 2358 2359 2360 2361 2362 2363 2364 2365 2366 2367
static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
				    struct ps_data *ps, struct sk_buff *skb)
{
	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) {
		__ieee80211_beacon_add_tim(sdata, ps, skb);
	} else {
J
Johannes Berg 已提交
2368
		spin_lock_bh(&local->tim_lock);
2369
		__ieee80211_beacon_add_tim(sdata, ps, skb);
J
Johannes Berg 已提交
2370
		spin_unlock_bh(&local->tim_lock);
2371 2372 2373 2374 2375
	}

	return 0;
}

2376 2377 2378 2379 2380 2381 2382 2383 2384 2385 2386 2387 2388 2389 2390
void ieee80211_csa_finish(struct ieee80211_vif *vif)
{
	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);

	ieee80211_queue_work(&sdata->local->hw,
			     &sdata->csa_finalize_work);
}
EXPORT_SYMBOL(ieee80211_csa_finish);

static void ieee80211_update_csa(struct ieee80211_sub_if_data *sdata,
				 struct beacon_data *beacon)
{
	struct probe_resp *resp;
	int counter_offset_beacon = sdata->csa_counter_offset_beacon;
	int counter_offset_presp = sdata->csa_counter_offset_presp;
2391 2392 2393 2394 2395 2396 2397 2398 2399 2400 2401 2402
	u8 *beacon_data;
	size_t beacon_data_len;

	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;
2403 2404 2405 2406
	case NL80211_IFTYPE_MESH_POINT:
		beacon_data = beacon->head;
		beacon_data_len = beacon->head_len;
		break;
2407 2408 2409 2410 2411
	default:
		return;
	}
	if (WARN_ON(counter_offset_beacon >= beacon_data_len))
		return;
2412 2413

	/* warn if the driver did not check for/react to csa completeness */
2414
	if (WARN_ON(beacon_data[counter_offset_beacon] == 0))
2415 2416
		return;

2417
	beacon_data[counter_offset_beacon]--;
2418

2419
	if (sdata->vif.type == NL80211_IFTYPE_AP && counter_offset_presp) {
2420 2421 2422 2423 2424 2425 2426 2427 2428 2429 2430 2431 2432 2433 2434 2435 2436 2437 2438 2439 2440 2441 2442 2443 2444 2445 2446 2447 2448 2449 2450 2451 2452 2453
		rcu_read_lock();
		resp = rcu_dereference(sdata->u.ap.probe_resp);

		/* if nl80211 accepted the offset, this should not happen. */
		if (WARN_ON(!resp)) {
			rcu_read_unlock();
			return;
		}
		resp->data[counter_offset_presp]--;
		rcu_read_unlock();
	}
}

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 counter_beacon = sdata->csa_counter_offset_beacon;
	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;
2454 2455 2456 2457 2458 2459 2460
	} else if (vif->type == NL80211_IFTYPE_ADHOC) {
		struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;

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

2461 2462 2463 2464 2465 2466 2467 2468 2469
		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;

2470 2471
		beacon_data = beacon->head;
		beacon_data_len = beacon->head_len;
2472 2473 2474 2475 2476 2477 2478 2479 2480 2481 2482 2483 2484 2485 2486 2487 2488
	} else {
		WARN_ON(1);
		goto out;
	}

	if (WARN_ON(counter_beacon > beacon_data_len))
		goto out;

	if (beacon_data[counter_beacon] == 0)
		ret = true;
 out:
	rcu_read_unlock();

	return ret;
}
EXPORT_SYMBOL(ieee80211_csa_is_complete);

2489 2490 2491
struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
					 struct ieee80211_vif *vif,
					 u16 *tim_offset, u16 *tim_length)
2492 2493
{
	struct ieee80211_local *local = hw_to_local(hw);
2494
	struct sk_buff *skb = NULL;
2495
	struct ieee80211_tx_info *info;
2496
	struct ieee80211_sub_if_data *sdata = NULL;
J
Johannes Berg 已提交
2497
	enum ieee80211_band band;
2498
	struct ieee80211_tx_rate_control txrc;
J
Johannes Berg 已提交
2499
	struct ieee80211_chanctx_conf *chanctx_conf;
2500

2501
	rcu_read_lock();
2502

2503
	sdata = vif_to_sdata(vif);
J
Johannes Berg 已提交
2504
	chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2505

J
Johannes Berg 已提交
2506
	if (!ieee80211_sdata_running(sdata) || !chanctx_conf)
2507 2508
		goto out;

2509 2510 2511 2512 2513
	if (tim_offset)
		*tim_offset = 0;
	if (tim_length)
		*tim_length = 0;

2514
	if (sdata->vif.type == NL80211_IFTYPE_AP) {
2515 2516 2517
		struct ieee80211_if_ap *ap = &sdata->u.ap;
		struct beacon_data *beacon = rcu_dereference(ap->beacon);

D
Dan Carpenter 已提交
2518
		if (beacon) {
2519 2520 2521
			if (sdata->vif.csa_active)
				ieee80211_update_csa(sdata, beacon);

J
Johannes Berg 已提交
2522 2523 2524 2525 2526 2527 2528 2529 2530
			/*
			 * headroom, head length,
			 * tail length and maximum TIM length
			 */
			skb = dev_alloc_skb(local->tx_headroom +
					    beacon->head_len +
					    beacon->tail_len + 256);
			if (!skb)
				goto out;
2531

J
Johannes Berg 已提交
2532 2533 2534
			skb_reserve(skb, local->tx_headroom);
			memcpy(skb_put(skb, beacon->head_len), beacon->head,
			       beacon->head_len);
2535

2536
			ieee80211_beacon_add_tim(sdata, &ap->ps, skb);
2537

2538 2539 2540 2541 2542
			if (tim_offset)
				*tim_offset = beacon->head_len;
			if (tim_length)
				*tim_length = skb->len - beacon->head_len;

J
Johannes Berg 已提交
2543 2544 2545
			if (beacon->tail)
				memcpy(skb_put(skb, beacon->tail_len),
				       beacon->tail, beacon->tail_len);
2546 2547
		} else
			goto out;
2548
	} else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
2549
		struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
2550
		struct ieee80211_hdr *hdr;
2551
		struct beacon_data *presp = rcu_dereference(ifibss->presp);
2552

2553
		if (!presp)
2554 2555
			goto out;

2556 2557 2558 2559
		if (sdata->vif.csa_active)
			ieee80211_update_csa(sdata, presp);


2560
		skb = dev_alloc_skb(local->tx_headroom + presp->head_len);
2561 2562
		if (!skb)
			goto out;
2563 2564 2565
		skb_reserve(skb, local->tx_headroom);
		memcpy(skb_put(skb, presp->head_len), presp->head,
		       presp->head_len);
2566 2567

		hdr = (struct ieee80211_hdr *) skb->data;
2568 2569
		hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
						 IEEE80211_STYPE_BEACON);
J
Johannes Berg 已提交
2570
	} else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2571
		struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
T
Thomas Pedersen 已提交
2572
		struct beacon_data *bcn = rcu_dereference(ifmsh->beacon);
2573

T
Thomas Pedersen 已提交
2574
		if (!bcn)
2575 2576
			goto out;

2577 2578 2579
		if (sdata->vif.csa_active)
			ieee80211_update_csa(sdata, bcn);

2580 2581 2582 2583
		if (ifmsh->sync_ops)
			ifmsh->sync_ops->adjust_tbtt(
						sdata);

2584
		skb = dev_alloc_skb(local->tx_headroom +
T
Thomas Pedersen 已提交
2585
				    bcn->head_len +
M
Marco Porsch 已提交
2586
				    256 + /* TIM IE */
T
Thomas Pedersen 已提交
2587
				    bcn->tail_len);
J
Johannes Berg 已提交
2588 2589
		if (!skb)
			goto out;
T
Thomas Pedersen 已提交
2590 2591 2592 2593
		skb_reserve(skb, local->tx_headroom);
		memcpy(skb_put(skb, bcn->head_len), bcn->head, bcn->head_len);
		ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb);
		memcpy(skb_put(skb, bcn->tail_len), bcn->tail, bcn->tail_len);
2594 2595
	} else {
		WARN_ON(1);
2596
		goto out;
2597 2598
	}

2599
	band = chanctx_conf->def.chan->band;
J
Johannes Berg 已提交
2600

2601 2602
	info = IEEE80211_SKB_CB(skb);

J
Johannes Berg 已提交
2603
	info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
2604
	info->flags |= IEEE80211_TX_CTL_NO_ACK;
2605
	info->band = band;
2606 2607 2608

	memset(&txrc, 0, sizeof(txrc));
	txrc.hw = hw;
2609
	txrc.sband = local->hw.wiphy->bands[band];
2610 2611 2612
	txrc.bss_conf = &sdata->vif.bss_conf;
	txrc.skb = skb;
	txrc.reported_rate.idx = -1;
2613
	txrc.rate_idx_mask = sdata->rc_rateidx_mask[band];
2614
	if (txrc.rate_idx_mask == (1 << txrc.sband->n_bitrates) - 1)
2615 2616 2617
		txrc.max_rate_idx = -1;
	else
		txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
2618
	txrc.bss = true;
2619
	rate_control_get_rate(sdata, NULL, &txrc);
2620 2621

	info->control.vif = vif;
2622

2623 2624 2625
	info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT |
			IEEE80211_TX_CTL_ASSIGN_SEQ |
			IEEE80211_TX_CTL_FIRST_FRAGMENT;
2626
 out:
2627
	rcu_read_unlock();
2628 2629
	return skb;
}
2630
EXPORT_SYMBOL(ieee80211_beacon_get_tim);
2631

2632 2633 2634 2635
struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw,
					struct ieee80211_vif *vif)
{
	struct ieee80211_if_ap *ap = NULL;
2636 2637
	struct sk_buff *skb = NULL;
	struct probe_resp *presp = NULL;
2638 2639 2640 2641 2642 2643 2644 2645 2646 2647 2648 2649 2650
	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;

2651
	skb = dev_alloc_skb(presp->len);
2652 2653 2654
	if (!skb)
		goto out;

2655 2656
	memcpy(skb_put(skb, presp->len), presp->data, presp->len);

2657 2658 2659 2660 2661 2662 2663 2664 2665
	hdr = (struct ieee80211_hdr *) skb->data;
	memset(hdr->addr1, 0, sizeof(hdr->addr1));

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

2666 2667 2668 2669 2670 2671 2672 2673 2674 2675 2676 2677 2678 2679 2680 2681 2682
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));
2683
	if (!skb)
2684
		return NULL;
2685

2686 2687 2688 2689 2690 2691 2692 2693 2694 2695 2696 2697 2698 2699 2700 2701 2702 2703 2704 2705 2706 2707 2708 2709 2710 2711 2712 2713 2714 2715 2716 2717 2718 2719 2720
	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));
2721
	if (!skb)
2722
		return NULL;
2723

2724 2725 2726 2727 2728 2729 2730 2731 2732 2733 2734 2735 2736 2737 2738 2739
	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);

2740 2741 2742
struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw,
				       struct ieee80211_vif *vif,
				       const u8 *ssid, size_t ssid_len,
2743
				       size_t tailroom)
2744 2745 2746 2747 2748 2749 2750 2751 2752 2753 2754 2755 2756
{
	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) +
2757
			    ie_ssid_len + tailroom);
2758
	if (!skb)
2759 2760 2761 2762 2763 2764 2765 2766
		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
2767
	eth_broadcast_addr(hdr->addr1);
2768
	memcpy(hdr->addr2, vif->addr, ETH_ALEN);
J
Johannes Berg 已提交
2769
	eth_broadcast_addr(hdr->addr3);
2770 2771 2772 2773

	pos = skb_put(skb, ie_ssid_len);
	*pos++ = WLAN_EID_SSID;
	*pos++ = ssid_len;
2774
	if (ssid_len)
2775 2776 2777 2778 2779 2780 2781
		memcpy(pos, ssid, ssid_len);
	pos += ssid_len;

	return skb;
}
EXPORT_SYMBOL(ieee80211_probereq_get);

2782
void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
2783
		       const void *frame, size_t frame_len,
2784
		       const struct ieee80211_tx_info *frame_txctl,
2785 2786 2787 2788
		       struct ieee80211_rts *rts)
{
	const struct ieee80211_hdr *hdr = frame;

2789 2790
	rts->frame_control =
	    cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
2791 2792
	rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
					       frame_txctl);
2793 2794 2795 2796 2797
	memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
	memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
}
EXPORT_SYMBOL(ieee80211_rts_get);

2798
void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
2799
			     const void *frame, size_t frame_len,
2800
			     const struct ieee80211_tx_info *frame_txctl,
2801 2802 2803 2804
			     struct ieee80211_cts *cts)
{
	const struct ieee80211_hdr *hdr = frame;

2805 2806
	cts->frame_control =
	    cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
2807 2808
	cts->duration = ieee80211_ctstoself_duration(hw, vif,
						     frame_len, frame_txctl);
2809 2810 2811 2812 2813
	memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
}
EXPORT_SYMBOL(ieee80211_ctstoself_get);

struct sk_buff *
2814
ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
2815
			  struct ieee80211_vif *vif)
2816 2817
{
	struct ieee80211_local *local = hw_to_local(hw);
2818
	struct sk_buff *skb = NULL;
2819
	struct ieee80211_tx_data tx;
2820
	struct ieee80211_sub_if_data *sdata;
2821
	struct ps_data *ps;
2822
	struct ieee80211_tx_info *info;
J
Johannes Berg 已提交
2823
	struct ieee80211_chanctx_conf *chanctx_conf;
2824

2825
	sdata = vif_to_sdata(vif);
2826 2827

	rcu_read_lock();
J
Johannes Berg 已提交
2828
	chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2829

2830 2831 2832 2833 2834 2835 2836 2837 2838 2839 2840
	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
2841 2842
	} else if (ieee80211_vif_is_mesh(&sdata->vif)) {
		ps = &sdata->u.mesh.ps;
2843
	} else {
2844
		goto out;
2845
	}
2846

2847
	if (ps->dtim_count != 0 || !ps->dtim_bc_mc)
2848
		goto out; /* send buffered bc/mc only after DTIM beacon */
2849

2850
	while (1) {
2851
		skb = skb_dequeue(&ps->bc_buf);
2852
		if (!skb)
2853
			goto out;
2854 2855
		local->total_ps_buffered--;

2856
		if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) {
2857 2858 2859 2860 2861 2862 2863 2864 2865
			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);
		}

2866 2867
		if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
			sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev);
J
Johannes Berg 已提交
2868
		if (!ieee80211_tx_prepare(sdata, &tx, skb))
2869 2870 2871
			break;
		dev_kfree_skb_any(skb);
	}
2872 2873 2874

	info = IEEE80211_SKB_CB(skb);

2875
	tx.flags |= IEEE80211_TX_PS_BUFFERED;
2876
	info->band = chanctx_conf->def.chan->band;
2877

2878
	if (invoke_tx_handlers(&tx))
2879
		skb = NULL;
2880
 out:
2881
	rcu_read_unlock();
2882 2883 2884 2885

	return skb;
}
EXPORT_SYMBOL(ieee80211_get_buffered_bc);
J
Johannes Berg 已提交
2886

J
Johannes Berg 已提交
2887 2888 2889
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
2890
{
2891
	int ac = ieee802_1d_to_ac[tid & 7];
2892

J
Johannes Berg 已提交
2893 2894 2895 2896
	skb_set_mac_header(skb, 0);
	skb_set_network_header(skb, 0);
	skb_set_transport_header(skb, 0);

2897
	skb_set_queue_mapping(skb, ac);
2898
	skb->priority = tid;
2899

2900 2901
	skb->dev = sdata->dev;

2902 2903 2904 2905 2906 2907
	/*
	 * 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
2908
	ieee80211_xmit(sdata, skb, band);
2909
	local_bh_enable();
J
Johannes Berg 已提交
2910
}