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

	if (tx->key) {
592 593
		bool skip_hw = false;

594
		tx->key->tx_rx_count++;
595
		/* TODO: add threshold stuff again */
596

597 598 599 600
		switch (tx->key->conf.cipher) {
		case WLAN_CIPHER_SUITE_WEP40:
		case WLAN_CIPHER_SUITE_WEP104:
		case WLAN_CIPHER_SUITE_TKIP:
601
			if (!ieee80211_is_data_present(hdr->frame_control))
602 603
				tx->key = NULL;
			break;
604
		case WLAN_CIPHER_SUITE_CCMP:
605 606 607 608
			if (!ieee80211_is_data_present(hdr->frame_control) &&
			    !ieee80211_use_mfp(hdr->frame_control, tx->sta,
					       tx->skb))
				tx->key = NULL;
609 610
			else
				skip_hw = (tx->key->conf.flags &
611
					   IEEE80211_KEY_FLAG_SW_MGMT_TX) &&
612
					ieee80211_is_mgmt(hdr->frame_control);
613
			break;
614
		case WLAN_CIPHER_SUITE_AES_CMAC:
615 616 617
			if (!ieee80211_is_mgmt(hdr->frame_control))
				tx->key = NULL;
			break;
618
		}
619

620 621
		if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED &&
			     !ieee80211_is_deauth(hdr->frame_control)))
622 623
			return TX_DROP;

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624
		if (!skip_hw && tx->key &&
J
Johannes Berg 已提交
625
		    tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
626
			info->control.hw_key = &tx->key->conf;
627 628
	}

629
	return TX_CONTINUE;
630 631
}

632
static ieee80211_tx_result debug_noinline
633
ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
634
{
635
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
636 637
	struct ieee80211_hdr *hdr = (void *)tx->skb->data;
	struct ieee80211_supported_band *sband;
S
Shanyu Zhao 已提交
638
	u32 len;
639
	struct ieee80211_tx_rate_control txrc;
640
	struct ieee80211_sta_rates *ratetbl = NULL;
J
Johannes Berg 已提交
641
	bool assoc = false;
642

643
	memset(&txrc, 0, sizeof(txrc));
644

645
	sband = tx->local->hw.wiphy->bands[info->band];
646

S
Shanyu Zhao 已提交
647
	len = min_t(u32, tx->skb->len + FCS_LEN,
648
			 tx->local->hw.wiphy->frag_threshold);
649 650

	/* set up the tx rate control struct we give the RC algo */
J
Johannes Berg 已提交
651
	txrc.hw = &tx->local->hw;
652 653 654 655
	txrc.sband = sband;
	txrc.bss_conf = &tx->sdata->vif.bss_conf;
	txrc.skb = tx->skb;
	txrc.reported_rate.idx = -1;
656
	txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band];
657 658 659 660
	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;
661 662 663 664 665

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

666
	txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
667
		    tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT ||
668
		    tx->sdata->vif.type == NL80211_IFTYPE_ADHOC);
669 670

	/* set up RTS protection if desired */
671
	if (len > tx->local->hw.wiphy->rts_threshold) {
672
		txrc.rts = true;
673 674
	}

675
	info->control.use_rts = txrc.rts;
676 677
	info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot;

678 679 680 681 682 683 684 685
	/*
	 * 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
686
	     (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE))))
687 688 689
		txrc.short_preamble = true;

	info->control.short_preamble = txrc.short_preamble;
690

J
Johannes Berg 已提交
691 692
	if (tx->sta)
		assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
693 694 695 696 697

	/*
	 * 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
698
	if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc &&
699 700 701 702
		 !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",
703
		 tx->sdata->name, hdr->addr1,
704
		 info->band ? 5 : 2))
705
		return TX_DROP;
706

707 708 709 710
	/*
	 * If we're associated with the sta at this point we know we can at
	 * least send the frame at the lowest bit rate.
	 */
711 712
	rate_control_get_rate(tx->sdata, tx->sta, &txrc);

713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733
	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];
	}
734

735
	if (txrc.reported_rate.idx < 0) {
736
		txrc.reported_rate = tx->rate;
737 738 739
		if (tx->sta && ieee80211_is_data(hdr->frame_control))
			tx->sta->last_tx_rate = txrc.reported_rate;
	} else if (tx->sta)
740
		tx->sta->last_tx_rate = txrc.reported_rate;
741

742 743 744
	if (ratetbl)
		return TX_CONTINUE;

745 746
	if (unlikely(!info->control.rates[0].count))
		info->control.rates[0].count = 1;
747

748 749 750 751
	if (WARN_ON_ONCE((info->control.rates[0].count > 1) &&
			 (info->flags & IEEE80211_TX_CTL_NO_ACK)))
		info->control.rates[0].count = 1;

752 753 754
	return TX_CONTINUE;
}

755 756 757 758 759 760 761 762 763
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;

764 765 766 767 768
	/*
	 * 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.
	 */
769
	if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR))
770 771
		return TX_CONTINUE;

772 773 774 775 776 777
	if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
		return TX_CONTINUE;

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

778 779 780
	if (ieee80211_is_qos_nullfunc(hdr->frame_control))
		return TX_CONTINUE;

J
Johannes Berg 已提交
781 782 783
	/*
	 * Anything but QoS data that has a sequence number field
	 * (is long enough) gets a sequence number from the global
784 785
	 * 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
786
	 */
787 788
	if (!ieee80211_is_data_qos(hdr->frame_control) ||
	    is_multicast_ether_addr(hdr->addr1)) {
J
Johannes Berg 已提交
789
		/* driver should assign sequence number */
790
		info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
J
Johannes Berg 已提交
791 792 793
		/* 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;
794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818
		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;
}

819
static int ieee80211_fragment(struct ieee80211_tx_data *tx,
J
Johannes Berg 已提交
820 821 822
			      struct sk_buff *skb, int hdrlen,
			      int frag_threshold)
{
823
	struct ieee80211_local *local = tx->local;
824
	struct ieee80211_tx_info *info;
825
	struct sk_buff *tmp;
J
Johannes Berg 已提交
826 827 828 829 830 831 832
	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;

833 834
	/* first fragment was already added to queue by caller */

J
Johannes Berg 已提交
835 836 837 838 839 840 841 842 843 844 845 846
	while (rem) {
		int fraglen = per_fragm;

		if (fraglen > rem)
			fraglen = rem;
		rem -= fraglen;
		tmp = dev_alloc_skb(local->tx_headroom +
				    frag_threshold +
				    IEEE80211_ENCRYPT_HEADROOM +
				    IEEE80211_ENCRYPT_TAILROOM);
		if (!tmp)
			return -ENOMEM;
847 848 849

		__skb_queue_tail(&tx->skbs, tmp);

J
Johannes Berg 已提交
850 851 852 853
		skb_reserve(tmp, local->tx_headroom +
				 IEEE80211_ENCRYPT_HEADROOM);
		/* copy control information */
		memcpy(tmp->cb, skb->cb, sizeof(tmp->cb));
854 855 856 857 858 859 860 861

		info = IEEE80211_SKB_CB(tmp);
		info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT |
				 IEEE80211_TX_CTL_FIRST_FRAGMENT);

		if (rem)
			info->flags |= IEEE80211_TX_CTL_MORE_FRAMES;

J
Johannes Berg 已提交
862 863 864 865 866 867 868 869 870 871 872
		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;
	}

873
	/* adjust first fragment's length */
J
Johannes Berg 已提交
874 875 876 877
	skb->len = hdrlen + per_fragm;
	return 0;
}

878
static ieee80211_tx_result debug_noinline
879 880
ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
{
J
Johannes Berg 已提交
881 882 883
	struct sk_buff *skb = tx->skb;
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
	struct ieee80211_hdr *hdr = (void *)skb->data;
884
	int frag_threshold = tx->local->hw.wiphy->frag_threshold;
J
Johannes Berg 已提交
885 886
	int hdrlen;
	int fragnum;
887

888 889 890 891
	/* no matter what happens, tx->skb moves to tx->skbs */
	__skb_queue_tail(&tx->skbs, skb);
	tx->skb = NULL;

892 893 894 895
	if (info->flags & IEEE80211_TX_CTL_DONTFRAG)
		return TX_CONTINUE;

	if (tx->local->ops->set_frag_threshold)
896 897
		return TX_CONTINUE;

898 899
	/*
	 * Warn when submitting a fragmented A-MPDU frame and drop it.
J
Johannes Berg 已提交
900
	 * This scenario is handled in ieee80211_tx_prepare but extra
901
	 * caution taken here as fragmented ampdu may cause Tx stop.
902
	 */
S
Sujith 已提交
903
	if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
904 905
		return TX_DROP;

906
	hdrlen = ieee80211_hdrlen(hdr->frame_control);
907

908
	/* internal error, why isn't DONTFRAG set? */
909
	if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))
J
Johannes Berg 已提交
910
		return TX_DROP;
911

J
Johannes Berg 已提交
912 913 914 915 916 917 918 919
	/*
	 * 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.
	 */
920
	if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold))
J
Johannes Berg 已提交
921
		return TX_DROP;
922

J
Johannes Berg 已提交
923 924
	/* update duration/seq/flags of fragments */
	fragnum = 0;
925 926

	skb_queue_walk(&tx->skbs, skb) {
J
Johannes Berg 已提交
927
		const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
928

J
Johannes Berg 已提交
929 930
		hdr = (void *)skb->data;
		info = IEEE80211_SKB_CB(skb);
931

932
		if (!skb_queue_is_last(&tx->skbs, skb)) {
J
Johannes Berg 已提交
933
			hdr->frame_control |= morefrags;
934 935 936 937 938 939 940
			/*
			 * 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;
941
			BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4);
942
			info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
J
Johannes Berg 已提交
943 944
		} else {
			hdr->frame_control &= ~morefrags;
945
		}
J
Johannes Berg 已提交
946 947
		hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG);
		fragnum++;
948
	}
949

950
	return TX_CONTINUE;
951 952
}

953 954 955
static ieee80211_tx_result debug_noinline
ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
{
956
	struct sk_buff *skb;
957
	int ac = -1;
958 959 960 961

	if (!tx->sta)
		return TX_CONTINUE;

962
	skb_queue_walk(&tx->skbs, skb) {
963
		ac = skb_get_queue_mapping(skb);
964
		tx->sta->tx_fragments++;
965
		tx->sta->tx_bytes[ac] += skb->len;
966
	}
967 968
	if (ac >= 0)
		tx->sta->tx_packets[ac]++;
969 970 971 972

	return TX_CONTINUE;
}

973
static ieee80211_tx_result debug_noinline
974 975 976 977 978
ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
{
	if (!tx->key)
		return TX_CONTINUE;

979 980 981
	switch (tx->key->conf.cipher) {
	case WLAN_CIPHER_SUITE_WEP40:
	case WLAN_CIPHER_SUITE_WEP104:
982
		return ieee80211_crypto_wep_encrypt(tx);
983
	case WLAN_CIPHER_SUITE_TKIP:
984
		return ieee80211_crypto_tkip_encrypt(tx);
985
	case WLAN_CIPHER_SUITE_CCMP:
986
		return ieee80211_crypto_ccmp_encrypt(tx);
987
	case WLAN_CIPHER_SUITE_AES_CMAC:
988
		return ieee80211_crypto_aes_cmac_encrypt(tx);
989
	default:
990
		return ieee80211_crypto_hw_encrypt(tx);
991 992 993 994 995
	}

	return TX_DROP;
}

996
static ieee80211_tx_result debug_noinline
J
Johannes Berg 已提交
997 998
ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
{
999
	struct sk_buff *skb;
J
Johannes Berg 已提交
1000 1001 1002
	struct ieee80211_hdr *hdr;
	int next_len;
	bool group_addr;
J
Johannes Berg 已提交
1003

1004
	skb_queue_walk(&tx->skbs, skb) {
J
Johannes Berg 已提交
1005
		hdr = (void *) skb->data;
1006 1007
		if (unlikely(ieee80211_is_pspoll(hdr->frame_control)))
			break; /* must not overwrite AID */
1008 1009 1010 1011 1012
		if (!skb_queue_is_last(&tx->skbs, skb)) {
			struct sk_buff *next = skb_queue_next(&tx->skbs, skb);
			next_len = next->len;
		} else
			next_len = 0;
J
Johannes Berg 已提交
1013
		group_addr = is_multicast_ether_addr(hdr->addr1);
J
Johannes Berg 已提交
1014

J
Johannes Berg 已提交
1015
		hdr->duration_id =
1016 1017
			ieee80211_duration(tx, skb, group_addr, next_len);
	}
J
Johannes Berg 已提交
1018 1019 1020 1021

	return TX_CONTINUE;
}

1022 1023
/* actual transmit path */

1024 1025 1026 1027 1028 1029 1030
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;
1031
	bool reset_agg_timer = false;
1032
	struct sk_buff *purge_skb = NULL;
1033 1034 1035

	if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
		info->flags |= IEEE80211_TX_CTL_AMPDU;
1036
		reset_agg_timer = true;
1037 1038 1039 1040 1041
	} 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
		 */
1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061
	} else {
		spin_lock(&tx->sta->lock);
		/*
		 * Need to re-check now, because we may get here
		 *
		 *  1) in the window during which the setup is actually
		 *     already done, but not marked yet because not all
		 *     packets are spliced over to the driver pending
		 *     queue yet -- if this happened we acquire the lock
		 *     either before or after the splice happens, but
		 *     need to recheck which of these cases happened.
		 *
		 *  2) during session teardown, if the OPERATIONAL bit
		 *     was cleared due to the teardown but the pointer
		 *     hasn't been assigned NULL yet (or we loaded it
		 *     before it was assigned) -- in this case it may
		 *     now be NULL which means we should just let the
		 *     packet pass through because splicing the frames
		 *     back is already done.
		 */
J
Johannes Berg 已提交
1062
		tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid);
1063 1064 1065 1066 1067

		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;
1068
			reset_agg_timer = true;
1069 1070 1071 1072 1073
		} else {
			queued = true;
			info->control.vif = &tx->sdata->vif;
			info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
			__skb_queue_tail(&tid_tx->pending, skb);
1074 1075
			if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER)
				purge_skb = __skb_dequeue(&tid_tx->pending);
1076 1077
		}
		spin_unlock(&tx->sta->lock);
1078 1079

		if (purge_skb)
1080
			ieee80211_free_txskb(&tx->local->hw, purge_skb);
1081 1082
	}

1083 1084
	/* reset session timer */
	if (reset_agg_timer && tid_tx->timeout)
1085
		tid_tx->last_tx = jiffies;
1086

1087 1088 1089
	return queued;
}

1090 1091 1092
/*
 * initialises @tx
 */
1093
static ieee80211_tx_result
J
Johannes Berg 已提交
1094 1095 1096
ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
		     struct ieee80211_tx_data *tx,
		     struct sk_buff *skb)
1097
{
J
Johannes Berg 已提交
1098
	struct ieee80211_local *local = sdata->local;
1099
	struct ieee80211_hdr *hdr;
1100
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
J
Johannes Berg 已提交
1101
	int tid;
1102
	u8 *qc;
1103 1104 1105 1106

	memset(tx, 0, sizeof(*tx));
	tx->skb = skb;
	tx->local = local;
J
Johannes Berg 已提交
1107
	tx->sdata = sdata;
1108
	__skb_queue_head_init(&tx->skbs);
1109

1110 1111 1112 1113 1114 1115 1116
	/*
	 * 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;

1117 1118
	hdr = (struct ieee80211_hdr *) skb->data;

1119
	if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1120
		tx->sta = rcu_dereference(sdata->u.vlan.sta);
1121 1122
		if (!tx->sta && sdata->dev->ieee80211_ptr->use_4addr)
			return TX_DROP;
1123 1124
	} else if (info->flags & (IEEE80211_TX_CTL_INJECTED |
				  IEEE80211_TX_INTFL_NL80211_FRAME_TX) ||
1125
		   tx->sdata->control_port_protocol == tx->skb->protocol) {
1126
		tx->sta = sta_info_get_bss(sdata, hdr->addr1);
1127
	}
1128
	if (!tx->sta)
1129
		tx->sta = sta_info_get(sdata, hdr->addr1);
1130

1131
	if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) &&
1132
	    !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
1133 1134
	    (local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION) &&
	    !(local->hw.flags & IEEE80211_HW_TX_AMPDU_SETUP_IN_HW)) {
1135 1136
		struct tid_ampdu_tx *tid_tx;

S
Sujith 已提交
1137 1138 1139
		qc = ieee80211_get_qos_ctl(hdr);
		tid = *qc & IEEE80211_QOS_CTL_TID_MASK;

1140 1141 1142
		tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
		if (tid_tx) {
			bool queued;
1143

1144 1145 1146 1147 1148 1149
			queued = ieee80211_tx_prep_agg(tx, skb, info,
						       tid_tx, tid);

			if (unlikely(queued))
				return TX_QUEUED;
		}
S
Sujith 已提交
1150 1151
	}

1152
	if (is_multicast_ether_addr(hdr->addr1)) {
1153
		tx->flags &= ~IEEE80211_TX_UNICAST;
1154
		info->flags |= IEEE80211_TX_CTL_NO_ACK;
1155
	} else
1156
		tx->flags |= IEEE80211_TX_UNICAST;
1157

1158 1159 1160 1161 1162
	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;
1163 1164
	}

1165
	if (!tx->sta)
1166
		info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
J
Johannes Berg 已提交
1167
	else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT))
1168
		info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1169

1170
	info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
1171

1172
	return TX_CONTINUE;
1173 1174
}

1175 1176 1177 1178 1179
static bool ieee80211_tx_frags(struct ieee80211_local *local,
			       struct ieee80211_vif *vif,
			       struct ieee80211_sta *sta,
			       struct sk_buff_head *skbs,
			       bool txpending)
1180
{
1181
	struct ieee80211_tx_control control;
1182
	struct sk_buff *skb, *tmp;
J
Johannes Berg 已提交
1183
	unsigned long flags;
1184

1185
	skb_queue_walk_safe(skbs, skb, tmp) {
1186 1187 1188 1189 1190 1191
		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);
1192
			ieee80211_free_txskb(&local->hw, skb);
1193 1194 1195
			continue;
		}
#endif
J
Johannes Berg 已提交
1196 1197 1198

		spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
		if (local->queue_stop_reasons[q] ||
1199
		    (!txpending && !skb_queue_empty(&local->pending[q]))) {
1200
			if (unlikely(info->flags &
1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218
				     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 {

1219
				/*
1220 1221 1222
				 * Since queue is stopped, queue up frames for
				 * later transmission from the tx-pending
				 * tasklet when the queue is woken again.
1223
				 */
1224 1225 1226 1227 1228 1229 1230 1231 1232 1233
				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;
1234
			}
1235
		}
J
Johannes Berg 已提交
1236
		spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1237

1238
		info->control.vif = vif;
1239
		control.sta = sta;
1240

1241
		__skb_unlink(skb, skbs);
1242
		drv_tx(local, &control, skb);
1243
	}
1244

1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261
	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;
1262

1263 1264
	if (WARN_ON(skb_queue_empty(skbs)))
		return true;
J
Johannes Berg 已提交
1265

1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279
	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:
1280 1281 1282 1283
		if (sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE) {
			vif = &sdata->vif;
			break;
		}
1284
		sdata = rcu_dereference(local->monitor_sdata);
1285
		if (sdata) {
1286
			vif = &sdata->vif;
1287 1288 1289 1290 1291 1292
			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
1293
			vif = NULL;
1294 1295 1296 1297 1298 1299 1300 1301
		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;
1302
	}
J
Johannes Berg 已提交
1303

1304 1305
	result = ieee80211_tx_frags(local, vif, pubsta, skbs,
				    txpending);
1306

1307 1308
	ieee80211_tpt_led_trig_tx(local, fc, led_len);

J
Johannes Berg 已提交
1309
	WARN_ON_ONCE(!skb_queue_empty(skbs));
1310

1311
	return result;
1312 1313
}

1314 1315 1316 1317 1318 1319
/*
 * 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)
{
1320
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
1321 1322
	ieee80211_tx_result res = TX_DROP;

1323 1324 1325 1326 1327 1328 1329
#define CALL_TXH(txh) \
	do {				\
		res = txh(tx);		\
		if (res != TX_CONTINUE)	\
			goto txh_done;	\
	} while (0)

1330
	CALL_TXH(ieee80211_tx_h_dynamic_ps);
1331 1332
	CALL_TXH(ieee80211_tx_h_check_assoc);
	CALL_TXH(ieee80211_tx_h_ps_buf);
1333
	CALL_TXH(ieee80211_tx_h_check_control_port_protocol);
1334
	CALL_TXH(ieee80211_tx_h_select_key);
1335 1336
	if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
		CALL_TXH(ieee80211_tx_h_rate_ctrl);
1337

J
Johannes Berg 已提交
1338 1339 1340
	if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) {
		__skb_queue_tail(&tx->skbs, tx->skb);
		tx->skb = NULL;
1341
		goto txh_done;
J
Johannes Berg 已提交
1342
	}
1343 1344

	CALL_TXH(ieee80211_tx_h_michael_mic_add);
1345 1346
	CALL_TXH(ieee80211_tx_h_sequence);
	CALL_TXH(ieee80211_tx_h_fragment);
1347
	/* handlers after fragment must be aware of tx info fragmentation! */
1348 1349
	CALL_TXH(ieee80211_tx_h_stats);
	CALL_TXH(ieee80211_tx_h_encrypt);
1350 1351
	if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
		CALL_TXH(ieee80211_tx_h_calculate_duration);
1352
#undef CALL_TXH
1353

1354
 txh_done:
1355
	if (unlikely(res == TX_DROP)) {
1356
		I802_DEBUG_INC(tx->local->tx_handlers_drop);
1357
		if (tx->skb)
1358
			ieee80211_free_txskb(&tx->local->hw, tx->skb);
1359
		else
1360
			ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs);
1361 1362
		return -1;
	} else if (unlikely(res == TX_QUEUED)) {
1363
		I802_DEBUG_INC(tx->local->tx_handlers_queued);
1364 1365 1366 1367 1368 1369
		return -1;
	}

	return 0;
}

1370 1371 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
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);

1399 1400 1401 1402
/*
 * 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
1403 1404
			 struct sk_buff *skb, bool txpending,
			 enum ieee80211_band band)
1405
{
J
Johannes Berg 已提交
1406
	struct ieee80211_local *local = sdata->local;
1407
	struct ieee80211_tx_data tx;
1408
	ieee80211_tx_result res_prepare;
1409
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1410
	bool result = true;
1411
	int led_len;
1412 1413 1414

	if (unlikely(skb->len < 10)) {
		dev_kfree_skb(skb);
1415
		return true;
1416 1417
	}

1418
	/* initialises tx */
1419
	led_len = skb->len;
J
Johannes Berg 已提交
1420
	res_prepare = ieee80211_tx_prepare(sdata, &tx, skb);
1421

1422
	if (unlikely(res_prepare == TX_DROP)) {
1423
		ieee80211_free_txskb(&local->hw, skb);
J
Johannes Berg 已提交
1424
		return true;
1425
	} else if (unlikely(res_prepare == TX_QUEUED)) {
J
Johannes Berg 已提交
1426
		return true;
1427 1428
	}

J
Johannes Berg 已提交
1429
	info->band = band;
1430

1431 1432 1433 1434 1435 1436
	/* 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)];

1437
	if (!invoke_tx_handlers(&tx))
1438 1439
		result = __ieee80211_tx(local, &tx.skbs, led_len,
					tx.sta, txpending);
J
Johannes Berg 已提交
1440

1441
	return result;
1442 1443 1444 1445
}

/* device xmit handlers */

1446
static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata,
1447 1448 1449
				struct sk_buff *skb,
				int head_need, bool may_encrypt)
{
1450
	struct ieee80211_local *local = sdata->local;
1451 1452
	int tail_need = 0;

1453
	if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) {
1454 1455 1456 1457 1458
		tail_need = IEEE80211_ENCRYPT_TAILROOM;
		tail_need -= skb_tailroom(skb);
		tail_need = max_t(int, tail_need, 0);
	}

1459
	if (skb_cloned(skb))
1460
		I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1461
	else if (head_need || tail_need)
1462
		I802_DEBUG_INC(local->tx_expand_skb_head);
1463 1464
	else
		return 0;
1465 1466

	if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
J
Joe Perches 已提交
1467 1468
		wiphy_debug(local->hw.wiphy,
			    "failed to reallocate TX buffer\n");
1469 1470 1471 1472 1473 1474
		return -ENOMEM;
	}

	return 0;
}

J
Johannes Berg 已提交
1475 1476
void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
		    enum ieee80211_band band)
1477
{
J
Johannes Berg 已提交
1478
	struct ieee80211_local *local = sdata->local;
1479
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1480
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1481
	int headroom;
1482
	bool may_encrypt;
1483

J
Johannes Berg 已提交
1484
	may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT);
1485

J
Johannes Berg 已提交
1486
	headroom = local->tx_headroom;
1487 1488 1489 1490 1491
	if (may_encrypt)
		headroom += IEEE80211_ENCRYPT_HEADROOM;
	headroom -= skb_headroom(skb);
	headroom = max_t(int, 0, headroom);

1492
	if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) {
1493
		ieee80211_free_txskb(&local->hw, skb);
J
Johannes Berg 已提交
1494
		return;
1495 1496
	}

1497
	hdr = (struct ieee80211_hdr *) skb->data;
1498
	info->control.vif = &sdata->vif;
1499

M
Marco Porsch 已提交
1500 1501 1502
	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
1503
			if (mesh_nexthop_resolve(sdata, skb))
M
Marco Porsch 已提交
1504 1505 1506 1507
				return; /* skb queued: don't free */
		} else {
			ieee80211_mps_set_frame_flags(sdata, NULL, hdr);
		}
1508
	}
1509

1510
	ieee80211_set_qos_hdr(sdata, skb);
J
Johannes Berg 已提交
1511
	ieee80211_tx(sdata, skb, false, band);
1512 1513
}

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
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;
}

1597 1598
netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
					 struct net_device *dev)
1599 1600
{
	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
J
Johannes Berg 已提交
1601 1602
	struct ieee80211_chanctx_conf *chanctx_conf;
	struct ieee80211_channel *chan;
1603 1604
	struct ieee80211_radiotap_header *prthdr =
		(struct ieee80211_radiotap_header *)skb->data;
J
Johannes Berg 已提交
1605
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1606
	struct ieee80211_hdr *hdr;
J
Johannes Berg 已提交
1607
	struct ieee80211_sub_if_data *tmp_sdata, *sdata;
1608
	u16 len_rthdr;
J
Johannes Berg 已提交
1609
	int hdrlen;
1610

1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624
	/* 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 */
1625 1626 1627 1628 1629 1630 1631

	/*
	 * 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
	 */
1632
	skb_set_mac_header(skb, len_rthdr);
1633
	/*
1634 1635
	 * 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
1636
	 */
1637 1638
	skb_set_network_header(skb, len_rthdr);
	skb_set_transport_header(skb, len_rthdr);
1639

J
Johannes Berg 已提交
1640 1641 1642 1643 1644 1645 1646 1647 1648
	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;

1649 1650 1651 1652
	/*
	 * Initialize skb->protocol if the injected frame is a data frame
	 * carrying a rfc1042 header
	 */
J
Johannes Berg 已提交
1653 1654 1655 1656
	if (ieee80211_is_data(hdr->frame_control) &&
	    skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) {
		u8 *payload = (u8 *)hdr + hdrlen;

1657
		if (ether_addr_equal(payload, rfc1042_header))
J
Johannes Berg 已提交
1658 1659
			skb->protocol = cpu_to_be16((payload[6] << 8) |
						    payload[7]);
1660 1661
	}

J
Johannes Berg 已提交
1662 1663
	memset(info, 0, sizeof(*info));

J
Johannes Berg 已提交
1664
	info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
1665 1666 1667 1668 1669
		      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
1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689

	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;
1690
		if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) {
J
Johannes Berg 已提交
1691 1692 1693 1694
			sdata = tmp_sdata;
			break;
		}
	}
1695

J
Johannes Berg 已提交
1696 1697 1698 1699 1700 1701 1702 1703
	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);
	}

1704 1705 1706
	if (chanctx_conf)
		chan = chanctx_conf->def.chan;
	else if (!local->use_chanctx)
1707
		chan = local->_oper_chandef.chan;
1708 1709
	else
		goto fail_rcu;
J
Johannes Berg 已提交
1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726

	/*
	 * 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.
	 */
1727
	if ((chan->flags & (IEEE80211_CHAN_NO_IR | IEEE80211_CHAN_RADAR)))
J
Johannes Berg 已提交
1728 1729 1730
		goto fail_rcu;

	ieee80211_xmit(sdata, skb, chan->band);
J
Johannes Berg 已提交
1731 1732
	rcu_read_unlock();

1733
	return NETDEV_TX_OK;
1734

J
Johannes Berg 已提交
1735 1736
fail_rcu:
	rcu_read_unlock();
1737 1738 1739
fail:
	dev_kfree_skb(skb);
	return NETDEV_TX_OK; /* meaning, we dealt with the skb */
1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756
}

/**
 * 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).
 */
1757 1758
netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
				    struct net_device *dev)
1759
{
1760 1761
	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
	struct ieee80211_local *local = sdata->local;
1762
	struct ieee80211_tx_info *info;
1763
	int head_need;
1764 1765
	u16 ethertype, hdrlen,  meshhdrlen = 0;
	__le16 fc;
1766
	struct ieee80211_hdr hdr;
1767
	struct ieee80211s_hdr mesh_hdr __maybe_unused;
1768
	struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL;
1769 1770
	const u8 *encaps_data;
	int encaps_len, skip_header_bytes;
1771
	int nh_pos, h_pos;
1772
	struct sta_info *sta = NULL;
J
Johannes Berg 已提交
1773
	bool wme_sta = false, authorized = false, tdls_auth = false;
1774
	bool tdls_direct = false;
J
Johannes Berg 已提交
1775 1776 1777
	bool multicast;
	u32 info_flags = 0;
	u16 info_id = 0;
J
Johannes Berg 已提交
1778 1779 1780
	struct ieee80211_chanctx_conf *chanctx_conf;
	struct ieee80211_sub_if_data *ap_sdata;
	enum ieee80211_band band;
1781

1782
	if (unlikely(skb->len < ETH_HLEN))
1783 1784 1785 1786 1787
		goto fail;

	/* convert Ethernet header to proper 802.11 header (based on
	 * operation mode) */
	ethertype = (skb->data[12] << 8) | skb->data[13];
1788
	fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
1789

J
Johannes Berg 已提交
1790 1791
	rcu_read_lock();

1792
	switch (sdata->vif.type) {
1793
	case NL80211_IFTYPE_AP_VLAN:
1794
		sta = rcu_dereference(sdata->u.vlan.sta);
1795 1796 1797 1798
		if (sta) {
			fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
			/* RA TA DA SA */
			memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN);
1799
			memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1800 1801 1802
			memcpy(hdr.addr3, skb->data, ETH_ALEN);
			memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
			hdrlen = 30;
J
Johannes Berg 已提交
1803 1804
			authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
			wme_sta = test_sta_flag(sta, WLAN_STA_WME);
1805
		}
J
Johannes Berg 已提交
1806 1807 1808 1809 1810
		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;
1811
		band = chanctx_conf->def.chan->band;
1812 1813 1814 1815
		if (sta)
			break;
		/* fall through */
	case NL80211_IFTYPE_AP:
A
Arnd Bergmann 已提交
1816 1817 1818 1819
		if (sdata->vif.type == NL80211_IFTYPE_AP)
			chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
		if (!chanctx_conf)
			goto fail_rcu;
1820
		fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
1821 1822
		/* DA BSSID SA */
		memcpy(hdr.addr1, skb->data, ETH_ALEN);
1823
		memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1824 1825
		memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
		hdrlen = 24;
1826
		band = chanctx_conf->def.chan->band;
1827
		break;
1828
	case NL80211_IFTYPE_WDS:
1829
		fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1830 1831
		/* RA TA DA SA */
		memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
1832
		memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1833 1834 1835
		memcpy(hdr.addr3, skb->data, ETH_ALEN);
		memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
		hdrlen = 30;
J
Johannes Berg 已提交
1836 1837 1838 1839
		/*
		 * This is the exception! WDS style interfaces are prohibited
		 * when channel contexts are in used so this must be valid
		 */
1840
		band = local->hw.conf.chandef.chan->band;
1841
		break;
1842
#ifdef CONFIG_MAC80211_MESH
1843
	case NL80211_IFTYPE_MESH_POINT:
1844
		if (!is_multicast_ether_addr(skb->data)) {
1845 1846 1847
			struct sta_info *next_hop;
			bool mpp_lookup = true;

J
Johannes Berg 已提交
1848
			mpath = mesh_path_lookup(sdata, skb->data);
1849 1850 1851 1852 1853 1854 1855 1856 1857 1858
			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
1859
				mppath = mpp_path_lookup(sdata, skb->data);
1860 1861 1862

			if (mppath && mpath)
				mesh_path_del(mpath->sdata, mpath->dst);
1863
		}
1864

1865
		/*
1866 1867 1868 1869
		 * 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)
1870
		 */
1871 1872
		if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) &&
		    !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) {
1873 1874
			hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
					skb->data, skb->data + ETH_ALEN);
J
Johannes Berg 已提交
1875 1876
			meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr,
							       NULL, NULL);
1877
		} else {
1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889
			/* 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;
1890

1891
			hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
1892
					mesh_da, sdata->vif.addr);
1893 1894
			if (is_multicast_ether_addr(mesh_da))
				/* DA TA mSA AE:SA */
J
Johannes Berg 已提交
1895 1896 1897
				meshhdrlen = ieee80211_new_mesh_header(
						sdata, &mesh_hdr,
						skb->data + ETH_ALEN, NULL);
1898
			else
1899
				/* RA TA mDA mSA AE:DA SA */
J
Johannes Berg 已提交
1900 1901 1902
				meshhdrlen = ieee80211_new_mesh_header(
						sdata, &mesh_hdr, skb->data,
						skb->data + ETH_ALEN);
1903 1904

		}
J
Johannes Berg 已提交
1905 1906 1907
		chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
		if (!chanctx_conf)
			goto fail_rcu;
1908
		band = chanctx_conf->def.chan->band;
1909 1910
		break;
#endif
1911
	case NL80211_IFTYPE_STATION:
1912
		if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
J
Johannes Berg 已提交
1913 1914
			bool tdls_peer = false;

1915
			sta = sta_info_get(sdata, skb->data);
J
Johannes Berg 已提交
1916 1917 1918 1919 1920 1921 1922 1923 1924
			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);
			}
1925 1926 1927 1928 1929 1930

			/*
			 * If the TDLS link is enabled, send everything
			 * directly. Otherwise, allow TDLS setup frames
			 * to be transmitted indirectly.
			 */
J
Johannes Berg 已提交
1931
			tdls_direct = tdls_peer && (tdls_auth ||
1932 1933 1934 1935 1936 1937
				 !(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 */
1938
			if (!tdls_auth)
J
Johannes Berg 已提交
1939
				goto fail_rcu;
1940 1941 1942 1943 1944 1945 1946 1947 1948 1949

			/* 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);
1950
			/* RA TA DA SA */
1951
			memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
1952
			memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1953 1954 1955 1956 1957 1958
			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 */
1959
			memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
1960 1961 1962 1963
			memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
			memcpy(hdr.addr3, skb->data, ETH_ALEN);
			hdrlen = 24;
		}
J
Johannes Berg 已提交
1964 1965 1966
		chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
		if (!chanctx_conf)
			goto fail_rcu;
1967
		band = chanctx_conf->def.chan->band;
1968
		break;
1969
	case NL80211_IFTYPE_ADHOC:
1970 1971 1972
		/* DA SA BSSID */
		memcpy(hdr.addr1, skb->data, ETH_ALEN);
		memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1973
		memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN);
1974
		hdrlen = 24;
J
Johannes Berg 已提交
1975 1976 1977
		chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
		if (!chanctx_conf)
			goto fail_rcu;
1978
		band = chanctx_conf->def.chan->band;
1979 1980
		break;
	default:
J
Johannes Berg 已提交
1981
		goto fail_rcu;
1982 1983
	}

1984 1985 1986 1987 1988
	/*
	 * 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
1989 1990
	multicast = is_multicast_ether_addr(hdr.addr1);
	if (!multicast) {
1991
		sta = sta_info_get(sdata, hdr.addr1);
J
Johannes Berg 已提交
1992 1993 1994 1995
		if (sta) {
			authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
			wme_sta = test_sta_flag(sta, WLAN_STA_WME);
		}
1996 1997
	}

1998 1999
	/* For mesh, the use of the QoS header is mandatory */
	if (ieee80211_vif_is_mesh(&sdata->vif))
J
Johannes Berg 已提交
2000
		wme_sta = true;
2001

2002
	/* receiver and we are QoS enabled, use a QoS type frame */
J
Johannes Berg 已提交
2003
	if (wme_sta && local->hw.queues >= IEEE80211_NUM_ACS) {
2004
		fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
2005 2006 2007 2008
		hdrlen += 2;
	}

	/*
2009 2010
	 * Drop unicast frames to unauthorised stations unless they are
	 * EAPOL frames from the local station.
2011
	 */
2012
	if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) &&
2013
		     !multicast && !authorized &&
2014
		     (cpu_to_be16(ethertype) != sdata->control_port_protocol ||
2015
		      !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) {
2016
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
J
Johannes Berg 已提交
2017
		net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n",
2018
				    dev->name, hdr.addr1);
2019 2020 2021 2022
#endif

		I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);

J
Johannes Berg 已提交
2023
		goto fail_rcu;
2024 2025
	}

J
Johannes Berg 已提交
2026 2027 2028 2029 2030 2031 2032
	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
2033
			int id;
J
Johannes Berg 已提交
2034 2035

			spin_lock_irqsave(&local->ack_status_lock, flags);
T
Tejun Heo 已提交
2036 2037
			id = idr_alloc(&local->ack_status_frames, orig_skb,
				       1, 0x10000, GFP_ATOMIC);
J
Johannes Berg 已提交
2038 2039
			spin_unlock_irqrestore(&local->ack_status_lock, flags);

T
Tejun Heo 已提交
2040
			if (id >= 0) {
J
Johannes Berg 已提交
2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054
				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;
		}
	}

2055 2056 2057 2058
	/*
	 * If the skb is shared we need to obtain our own copy.
	 */
	if (skb_shared(skb)) {
J
Johannes Berg 已提交
2059 2060 2061 2062 2063
		struct sk_buff *tmp_skb = skb;

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

2064
		skb = skb_clone(skb, GFP_ATOMIC);
2065 2066
		kfree_skb(tmp_skb);

2067
		if (!skb)
J
Johannes Berg 已提交
2068
			goto fail_rcu;
2069 2070
	}

2071
	hdr.frame_control = fc;
2072 2073 2074 2075 2076 2077 2078 2079
	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
2080
	} else if (ethertype >= ETH_P_802_3_MIN) {
2081 2082 2083 2084 2085 2086 2087 2088
		encaps_data = rfc1042_header;
		encaps_len = sizeof(rfc1042_header);
		skip_header_bytes -= 2;
	} else {
		encaps_data = NULL;
		encaps_len = 0;
	}

2089 2090 2091
	nh_pos = skb_network_header(skb) - skb->data;
	h_pos = skb_transport_header(skb) - skb->data;

2092 2093 2094 2095
	skb_pull(skb, skip_header_bytes);
	nh_pos -= skip_header_bytes;
	h_pos -= skip_header_bytes;

2096
	head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
2097

2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108
	/*
	 * 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.
	 */
2109

2110
	if (head_need > 0 || skb_cloned(skb)) {
2111 2112 2113
		head_need += IEEE80211_ENCRYPT_HEADROOM;
		head_need += local->tx_headroom;
		head_need = max_t(int, 0, head_need);
2114 2115
		if (ieee80211_skb_resize(sdata, skb, head_need, true)) {
			ieee80211_free_txskb(&local->hw, skb);
J
Johannes Berg 已提交
2116
			skb = NULL;
J
Johannes Berg 已提交
2117
			goto fail_rcu;
2118
		}
2119 2120 2121 2122 2123 2124 2125
	}

	if (encaps_data) {
		memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
		nh_pos += encaps_len;
		h_pos += encaps_len;
	}
2126

2127
#ifdef CONFIG_MAC80211_MESH
2128 2129 2130 2131 2132
	if (meshhdrlen > 0) {
		memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
		nh_pos += meshhdrlen;
		h_pos += meshhdrlen;
	}
2133
#endif
2134

2135
	if (ieee80211_is_data_qos(fc)) {
2136 2137 2138 2139 2140 2141 2142 2143 2144 2145 2146 2147
		__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);

2148 2149 2150
	nh_pos += hdrlen;
	h_pos += hdrlen;

2151 2152
	dev->stats.tx_packets++;
	dev->stats.tx_bytes += skb->len;
2153 2154 2155 2156 2157 2158 2159 2160

	/* 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);

2161
	info = IEEE80211_SKB_CB(skb);
J
Johannes Berg 已提交
2162 2163
	memset(info, 0, sizeof(*info));

2164
	dev->trans_start = jiffies;
J
Johannes Berg 已提交
2165 2166 2167 2168

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

J
Johannes Berg 已提交
2169 2170
	ieee80211_xmit(sdata, skb, band);
	rcu_read_unlock();
2171

2172
	return NETDEV_TX_OK;
2173

J
Johannes Berg 已提交
2174 2175
 fail_rcu:
	rcu_read_unlock();
2176
 fail:
2177 2178
	dev_kfree_skb(skb);
	return NETDEV_TX_OK;
2179 2180 2181
}


2182 2183 2184 2185
/*
 * ieee80211_clear_tx_pending may not be called in a context where
 * it is possible that it packets could come in again.
 */
2186 2187
void ieee80211_clear_tx_pending(struct ieee80211_local *local)
{
2188
	struct sk_buff *skb;
J
Johannes Berg 已提交
2189
	int i;
2190

2191 2192 2193 2194
	for (i = 0; i < local->hw.queues; i++) {
		while ((skb = skb_dequeue(&local->pending[i])) != NULL)
			ieee80211_free_txskb(&local->hw, skb);
	}
2195 2196
}

2197 2198 2199 2200 2201
/*
 * 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.
 */
2202 2203 2204 2205 2206 2207 2208
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;
2209
	bool result;
J
Johannes Berg 已提交
2210
	struct ieee80211_chanctx_conf *chanctx_conf;
2211

2212
	sdata = vif_to_sdata(info->control.vif);
2213 2214

	if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) {
J
Johannes Berg 已提交
2215 2216 2217 2218 2219 2220
		chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
		if (unlikely(!chanctx_conf)) {
			dev_kfree_skb(skb);
			return true;
		}
		result = ieee80211_tx(sdata, skb, true,
2221
				      chanctx_conf->def.chan->band);
2222
	} else {
2223 2224 2225 2226 2227
		struct sk_buff_head skbs;

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

2228
		hdr = (struct ieee80211_hdr *)skb->data;
2229
		sta = sta_info_get(sdata, hdr->addr1);
2230

2231
		result = __ieee80211_tx(local, &skbs, skb->len, sta, true);
2232 2233 2234 2235 2236
	}

	return result;
}

2237
/*
J
Johannes Berg 已提交
2238
 * Transmit all pending packets. Called from tasklet.
2239
 */
2240 2241 2242
void ieee80211_tx_pending(unsigned long data)
{
	struct ieee80211_local *local = (struct ieee80211_local *)data;
2243
	unsigned long flags;
2244
	int i;
J
Johannes Berg 已提交
2245
	bool txok;
2246

2247
	rcu_read_lock();
2248

J
Johannes Berg 已提交
2249
	spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
2250 2251 2252 2253 2254
	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
2255
		if (local->queue_stop_reasons[i] ||
2256
		    skb_queue_empty(&local->pending[i]))
2257
			continue;
2258

2259
		while (!skb_queue_empty(&local->pending[i])) {
J
Johannes Berg 已提交
2260
			struct sk_buff *skb = __skb_dequeue(&local->pending[i]);
2261 2262
			struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);

2263
			if (WARN_ON(!info->control.vif)) {
2264
				ieee80211_free_txskb(&local->hw, skb);
2265 2266 2267
				continue;
			}

J
Johannes Berg 已提交
2268 2269 2270 2271 2272 2273 2274
			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)
2275
				break;
2276
		}
2277 2278

		if (skb_queue_empty(&local->pending[i]))
2279
			ieee80211_propagate_queue_wake(local, i);
2280
	}
J
Johannes Berg 已提交
2281
	spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
2282

2283
	rcu_read_unlock();
2284 2285 2286 2287
}

/* functions for drivers to get certain frames */

2288 2289
static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
				       struct ps_data *ps, struct sk_buff *skb)
2290 2291 2292 2293 2294 2295 2296
{
	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. */
2297
	if (atomic_read(&ps->num_sta_ps) > 0)
2298 2299
		/* in the hope that this is faster than
		 * checking byte-for-byte */
2300
		have_bits = !bitmap_empty((unsigned long*)ps->tim,
2301 2302
					  IEEE80211_MAX_AID+1);

2303 2304
	if (ps->dtim_count == 0)
		ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1;
2305
	else
2306
		ps->dtim_count--;
2307 2308 2309 2310

	tim = pos = (u8 *) skb_put(skb, 6);
	*pos++ = WLAN_EID_TIM;
	*pos++ = 4;
2311
	*pos++ = ps->dtim_count;
2312
	*pos++ = sdata->vif.bss_conf.dtim_period;
2313

2314
	if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf))
2315 2316
		aid0 = 1;

2317
	ps->dtim_bc_mc = aid0 == 1;
2318

2319 2320 2321 2322 2323 2324
	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++) {
2325
			if (ps->tim[i]) {
2326 2327 2328 2329 2330 2331
				n1 = i & 0xfe;
				break;
			}
		}
		n2 = n1;
		for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
2332
			if (ps->tim[i]) {
2333 2334 2335 2336 2337 2338 2339 2340
				n2 = i;
				break;
			}
		}

		/* Bitmap control */
		*pos++ = n1 | aid0;
		/* Part Virt Bitmap */
2341
		skb_put(skb, n2 - n1);
2342
		memcpy(pos, ps->tim + n1, n2 - n1 + 1);
2343 2344 2345 2346 2347 2348 2349 2350

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

2351 2352 2353 2354 2355 2356 2357 2358 2359 2360 2361 2362 2363 2364 2365
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
2366
		spin_lock_bh(&local->tim_lock);
2367
		__ieee80211_beacon_add_tim(sdata, ps, skb);
J
Johannes Berg 已提交
2368
		spin_unlock_bh(&local->tim_lock);
2369 2370 2371 2372 2373
	}

	return 0;
}

2374 2375 2376 2377 2378 2379 2380 2381 2382 2383 2384 2385 2386 2387 2388
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;
2389 2390 2391 2392 2393 2394 2395 2396 2397 2398 2399 2400
	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;
2401 2402 2403 2404
	case NL80211_IFTYPE_MESH_POINT:
		beacon_data = beacon->head;
		beacon_data_len = beacon->head_len;
		break;
2405 2406 2407 2408 2409
	default:
		return;
	}
	if (WARN_ON(counter_offset_beacon >= beacon_data_len))
		return;
2410 2411

	/* warn if the driver did not check for/react to csa completeness */
2412
	if (WARN_ON(beacon_data[counter_offset_beacon] == 0))
2413 2414
		return;

2415
	beacon_data[counter_offset_beacon]--;
2416

2417
	if (sdata->vif.type == NL80211_IFTYPE_AP && counter_offset_presp) {
2418 2419 2420 2421 2422 2423 2424 2425 2426 2427 2428 2429 2430 2431 2432 2433 2434 2435 2436 2437 2438 2439 2440 2441 2442 2443 2444 2445 2446 2447 2448 2449 2450 2451
		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;
2452 2453 2454 2455 2456 2457 2458
	} else if (vif->type == NL80211_IFTYPE_ADHOC) {
		struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;

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

2459 2460 2461 2462 2463 2464 2465 2466 2467
		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;

2468 2469
		beacon_data = beacon->head;
		beacon_data_len = beacon->head_len;
2470 2471 2472 2473 2474 2475 2476 2477 2478 2479 2480 2481 2482 2483 2484 2485 2486
	} 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);

2487 2488 2489
struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
					 struct ieee80211_vif *vif,
					 u16 *tim_offset, u16 *tim_length)
2490 2491
{
	struct ieee80211_local *local = hw_to_local(hw);
2492
	struct sk_buff *skb = NULL;
2493
	struct ieee80211_tx_info *info;
2494
	struct ieee80211_sub_if_data *sdata = NULL;
J
Johannes Berg 已提交
2495
	enum ieee80211_band band;
2496
	struct ieee80211_tx_rate_control txrc;
J
Johannes Berg 已提交
2497
	struct ieee80211_chanctx_conf *chanctx_conf;
2498

2499
	rcu_read_lock();
2500

2501
	sdata = vif_to_sdata(vif);
J
Johannes Berg 已提交
2502
	chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2503

J
Johannes Berg 已提交
2504
	if (!ieee80211_sdata_running(sdata) || !chanctx_conf)
2505 2506
		goto out;

2507 2508 2509 2510 2511
	if (tim_offset)
		*tim_offset = 0;
	if (tim_length)
		*tim_length = 0;

2512
	if (sdata->vif.type == NL80211_IFTYPE_AP) {
2513 2514 2515
		struct ieee80211_if_ap *ap = &sdata->u.ap;
		struct beacon_data *beacon = rcu_dereference(ap->beacon);

D
Dan Carpenter 已提交
2516
		if (beacon) {
2517 2518 2519
			if (sdata->vif.csa_active)
				ieee80211_update_csa(sdata, beacon);

J
Johannes Berg 已提交
2520 2521 2522 2523 2524 2525 2526 2527 2528
			/*
			 * 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;
2529

J
Johannes Berg 已提交
2530 2531 2532
			skb_reserve(skb, local->tx_headroom);
			memcpy(skb_put(skb, beacon->head_len), beacon->head,
			       beacon->head_len);
2533

2534
			ieee80211_beacon_add_tim(sdata, &ap->ps, skb);
2535

2536 2537 2538 2539 2540
			if (tim_offset)
				*tim_offset = beacon->head_len;
			if (tim_length)
				*tim_length = skb->len - beacon->head_len;

J
Johannes Berg 已提交
2541 2542 2543
			if (beacon->tail)
				memcpy(skb_put(skb, beacon->tail_len),
				       beacon->tail, beacon->tail_len);
2544 2545
		} else
			goto out;
2546
	} else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
2547
		struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
2548
		struct ieee80211_hdr *hdr;
2549
		struct beacon_data *presp = rcu_dereference(ifibss->presp);
2550

2551
		if (!presp)
2552 2553
			goto out;

2554 2555 2556 2557
		if (sdata->vif.csa_active)
			ieee80211_update_csa(sdata, presp);


2558
		skb = dev_alloc_skb(local->tx_headroom + presp->head_len);
2559 2560
		if (!skb)
			goto out;
2561 2562 2563
		skb_reserve(skb, local->tx_headroom);
		memcpy(skb_put(skb, presp->head_len), presp->head,
		       presp->head_len);
2564 2565

		hdr = (struct ieee80211_hdr *) skb->data;
2566 2567
		hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
						 IEEE80211_STYPE_BEACON);
J
Johannes Berg 已提交
2568
	} else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2569
		struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
T
Thomas Pedersen 已提交
2570
		struct beacon_data *bcn = rcu_dereference(ifmsh->beacon);
2571

T
Thomas Pedersen 已提交
2572
		if (!bcn)
2573 2574
			goto out;

2575 2576 2577
		if (sdata->vif.csa_active)
			ieee80211_update_csa(sdata, bcn);

2578 2579 2580 2581
		if (ifmsh->sync_ops)
			ifmsh->sync_ops->adjust_tbtt(
						sdata);

2582
		skb = dev_alloc_skb(local->tx_headroom +
T
Thomas Pedersen 已提交
2583
				    bcn->head_len +
M
Marco Porsch 已提交
2584
				    256 + /* TIM IE */
T
Thomas Pedersen 已提交
2585
				    bcn->tail_len);
J
Johannes Berg 已提交
2586 2587
		if (!skb)
			goto out;
T
Thomas Pedersen 已提交
2588 2589 2590 2591
		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);
2592 2593
	} else {
		WARN_ON(1);
2594
		goto out;
2595 2596
	}

2597
	band = chanctx_conf->def.chan->band;
J
Johannes Berg 已提交
2598

2599 2600
	info = IEEE80211_SKB_CB(skb);

J
Johannes Berg 已提交
2601
	info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
2602
	info->flags |= IEEE80211_TX_CTL_NO_ACK;
2603
	info->band = band;
2604 2605 2606

	memset(&txrc, 0, sizeof(txrc));
	txrc.hw = hw;
2607
	txrc.sband = local->hw.wiphy->bands[band];
2608 2609 2610
	txrc.bss_conf = &sdata->vif.bss_conf;
	txrc.skb = skb;
	txrc.reported_rate.idx = -1;
2611
	txrc.rate_idx_mask = sdata->rc_rateidx_mask[band];
2612
	if (txrc.rate_idx_mask == (1 << txrc.sband->n_bitrates) - 1)
2613 2614 2615
		txrc.max_rate_idx = -1;
	else
		txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
2616
	txrc.bss = true;
2617
	rate_control_get_rate(sdata, NULL, &txrc);
2618 2619

	info->control.vif = vif;
2620

2621 2622 2623
	info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT |
			IEEE80211_TX_CTL_ASSIGN_SEQ |
			IEEE80211_TX_CTL_FIRST_FRAGMENT;
2624
 out:
2625
	rcu_read_unlock();
2626 2627
	return skb;
}
2628
EXPORT_SYMBOL(ieee80211_beacon_get_tim);
2629

2630 2631 2632 2633
struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw,
					struct ieee80211_vif *vif)
{
	struct ieee80211_if_ap *ap = NULL;
2634 2635
	struct sk_buff *skb = NULL;
	struct probe_resp *presp = NULL;
2636 2637 2638 2639 2640 2641 2642 2643 2644 2645 2646 2647 2648
	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;

2649
	skb = dev_alloc_skb(presp->len);
2650 2651 2652
	if (!skb)
		goto out;

2653 2654
	memcpy(skb_put(skb, presp->len), presp->data, presp->len);

2655 2656 2657 2658 2659 2660 2661 2662 2663
	hdr = (struct ieee80211_hdr *) skb->data;
	memset(hdr->addr1, 0, sizeof(hdr->addr1));

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

2664 2665 2666 2667 2668 2669 2670 2671 2672 2673 2674 2675 2676 2677 2678 2679 2680
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));
2681
	if (!skb)
2682
		return NULL;
2683

2684 2685 2686 2687 2688 2689 2690 2691 2692 2693 2694 2695 2696 2697 2698 2699 2700 2701 2702 2703 2704 2705 2706 2707 2708 2709 2710 2711 2712 2713 2714 2715 2716 2717 2718
	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));
2719
	if (!skb)
2720
		return NULL;
2721

2722 2723 2724 2725 2726 2727 2728 2729 2730 2731 2732 2733 2734 2735 2736 2737
	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);

2738 2739 2740
struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw,
				       struct ieee80211_vif *vif,
				       const u8 *ssid, size_t ssid_len,
2741
				       size_t tailroom)
2742 2743 2744 2745 2746 2747 2748 2749 2750 2751 2752 2753 2754
{
	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) +
2755
			    ie_ssid_len + tailroom);
2756
	if (!skb)
2757 2758 2759 2760 2761 2762 2763 2764
		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
2765
	eth_broadcast_addr(hdr->addr1);
2766
	memcpy(hdr->addr2, vif->addr, ETH_ALEN);
J
Johannes Berg 已提交
2767
	eth_broadcast_addr(hdr->addr3);
2768 2769 2770 2771

	pos = skb_put(skb, ie_ssid_len);
	*pos++ = WLAN_EID_SSID;
	*pos++ = ssid_len;
2772
	if (ssid_len)
2773 2774 2775 2776 2777 2778 2779
		memcpy(pos, ssid, ssid_len);
	pos += ssid_len;

	return skb;
}
EXPORT_SYMBOL(ieee80211_probereq_get);

2780
void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
2781
		       const void *frame, size_t frame_len,
2782
		       const struct ieee80211_tx_info *frame_txctl,
2783 2784 2785 2786
		       struct ieee80211_rts *rts)
{
	const struct ieee80211_hdr *hdr = frame;

2787 2788
	rts->frame_control =
	    cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
2789 2790
	rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
					       frame_txctl);
2791 2792 2793 2794 2795
	memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
	memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
}
EXPORT_SYMBOL(ieee80211_rts_get);

2796
void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
2797
			     const void *frame, size_t frame_len,
2798
			     const struct ieee80211_tx_info *frame_txctl,
2799 2800 2801 2802
			     struct ieee80211_cts *cts)
{
	const struct ieee80211_hdr *hdr = frame;

2803 2804
	cts->frame_control =
	    cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
2805 2806
	cts->duration = ieee80211_ctstoself_duration(hw, vif,
						     frame_len, frame_txctl);
2807 2808 2809 2810 2811
	memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
}
EXPORT_SYMBOL(ieee80211_ctstoself_get);

struct sk_buff *
2812
ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
2813
			  struct ieee80211_vif *vif)
2814 2815
{
	struct ieee80211_local *local = hw_to_local(hw);
2816
	struct sk_buff *skb = NULL;
2817
	struct ieee80211_tx_data tx;
2818
	struct ieee80211_sub_if_data *sdata;
2819
	struct ps_data *ps;
2820
	struct ieee80211_tx_info *info;
J
Johannes Berg 已提交
2821
	struct ieee80211_chanctx_conf *chanctx_conf;
2822

2823
	sdata = vif_to_sdata(vif);
2824 2825

	rcu_read_lock();
J
Johannes Berg 已提交
2826
	chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2827

2828 2829 2830 2831 2832 2833 2834 2835 2836 2837 2838
	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
2839 2840
	} else if (ieee80211_vif_is_mesh(&sdata->vif)) {
		ps = &sdata->u.mesh.ps;
2841
	} else {
2842
		goto out;
2843
	}
2844

2845
	if (ps->dtim_count != 0 || !ps->dtim_bc_mc)
2846
		goto out; /* send buffered bc/mc only after DTIM beacon */
2847

2848
	while (1) {
2849
		skb = skb_dequeue(&ps->bc_buf);
2850
		if (!skb)
2851
			goto out;
2852 2853
		local->total_ps_buffered--;

2854
		if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) {
2855 2856 2857 2858 2859 2860 2861 2862 2863
			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);
		}

2864 2865
		if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
			sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev);
J
Johannes Berg 已提交
2866
		if (!ieee80211_tx_prepare(sdata, &tx, skb))
2867 2868 2869
			break;
		dev_kfree_skb_any(skb);
	}
2870 2871 2872

	info = IEEE80211_SKB_CB(skb);

2873
	tx.flags |= IEEE80211_TX_PS_BUFFERED;
2874
	info->band = chanctx_conf->def.chan->band;
2875

2876
	if (invoke_tx_handlers(&tx))
2877
		skb = NULL;
2878
 out:
2879
	rcu_read_unlock();
2880 2881 2882 2883

	return skb;
}
EXPORT_SYMBOL(ieee80211_get_buffered_bc);
J
Johannes Berg 已提交
2884

J
Johannes Berg 已提交
2885 2886 2887
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
2888
{
2889
	int ac = ieee802_1d_to_ac[tid & 7];
2890

J
Johannes Berg 已提交
2891 2892 2893 2894
	skb_set_mac_header(skb, 0);
	skb_set_network_header(skb, 0);
	skb_set_transport_header(skb, 0);

2895
	skb_set_queue_mapping(skb, ac);
2896
	skb->priority = tid;
2897

2898 2899
	skb->dev = sdata->dev;

2900 2901 2902 2903 2904 2905
	/*
	 * 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
2906
	ieee80211_xmit(sdata, skb, band);
2907
	local_bh_enable();
J
Johannes Berg 已提交
2908
}