tx.c 67.3 KB
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/*
 * Copyright 2002-2005, Instant802 Networks, Inc.
 * Copyright 2005-2006, Devicescape Software, Inc.
 * Copyright 2006-2007	Jiri Benc <jbenc@suse.cz>
 * Copyright 2007	Johannes Berg <johannes@sipsolutions.net>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 *
 * Transmit and frame generation functions.
 */

#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/skbuff.h>
#include <linux/etherdevice.h>
#include <linux/bitmap.h>
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#include <linux/rcupdate.h>
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#include <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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#define IEEE80211_TX_OK		0
#define IEEE80211_TX_AGAIN	1
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#define IEEE80211_TX_PENDING	2
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/* misc utils */

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static __le16 ieee80211_duration(struct ieee80211_tx_data *tx, int group_addr,
				 int next_frag_len)
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{
	int rate, mrate, erp, dur, i;
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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(tx->skb);

	/* assume HW handles this */
	if (info->control.rates[0].flags & IEEE80211_TX_RC_MCS)
		return 0;

	/* uh huh? */
	if (WARN_ON_ONCE(info->control.rates[0].idx < 0))
		return 0;
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	sband = local->hw.wiphy->bands[tx->channel->band];
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	txrate = &sband->bitrates[info->control.rates[0].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 *)tx->skb->data;
	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 (tx->sdata->vif.bss_conf.basic_rates & BIT(i))
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			rate = r->bitrate;

		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;
		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 */
		rate = mrate;
	}

	/* Time needed to transmit ACK
	 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
	 * to closest integer */

	dur = ieee80211_frame_duration(local, 10, rate, erp,
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				tx->sdata->vif.bss_conf.use_short_preamble);
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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 */
		dur += ieee80211_frame_duration(local, next_frag_len,
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				txrate->bitrate, erp,
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				tx->sdata->vif.bss_conf.use_short_preamble);
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	}

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	return cpu_to_le16(dur);
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}

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static int inline is_ieee80211_device(struct ieee80211_local *local,
				      struct net_device *dev)
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{
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	return local == wdev_priv(dev->ieee80211_ptr);
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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.
	 *
	 * Note: local->uapsd_queues access is racy here. If the value is
	 * changed via debugfs, user needs to reassociate manually to have
	 * everything in sync.
	 */
	if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
	    && (local->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
	    && skb_get_queue_mapping(tx->skb) == 0)
		return TX_CONTINUE;

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	if (local->hw.conf.flags & IEEE80211_CONF_PS) {
		ieee80211_stop_queues_by_reason(&local->hw,
						IEEE80211_QUEUE_STOP_REASON_PS);
		ieee80211_queue_work(&local->hw,
				     &local->dynamic_ps_disable_work);
	}

	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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	u32 sta_flags;

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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_OFF_CHANNEL, &tx->local->scanning)) &&
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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_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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	sta_flags = tx->sta ? get_sta_flags(tx->sta) : 0;
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	if (likely(tx->flags & IEEE80211_TX_UNICAST)) {
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		if (unlikely(!(sta_flags & WLAN_STA_ASSOC) &&
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			     tx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
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			     ieee80211_is_data(hdr->frame_control))) {
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#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
			printk(KERN_DEBUG "%s: dropped data frame to not "
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			       "associated station %pM\n",
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			       tx->sdata->name, hdr->addr1);
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#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
			I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
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			return TX_DROP;
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		}
	} else {
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		if (unlikely(ieee80211_is_data(hdr->frame_control) &&
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			     tx->local->num_sta == 0 &&
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			     tx->sdata->vif.type != NL80211_IFTYPE_ADHOC)) {
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			/*
			 * No associated STAs - no need to send multicast
			 * frames.
			 */
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			return TX_DROP;
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		}
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		return TX_CONTINUE;
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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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	/*
	 * virtual interfaces are protected by RCU
	 */
	rcu_read_lock();

	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
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		struct ieee80211_if_ap *ap;
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		if (sdata->vif.type != NL80211_IFTYPE_AP)
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			continue;
		ap = &sdata->u.ap;
		skb = skb_dequeue(&ap->ps_bc_buf);
		if (skb) {
			purged++;
			dev_kfree_skb(skb);
		}
		total += skb_queue_len(&ap->ps_bc_buf);
	}

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	list_for_each_entry_rcu(sta, &local->sta_list, list) {
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		skb = skb_dequeue(&sta->ps_tx_buf);
		if (skb) {
			purged++;
			dev_kfree_skb(skb);
		}
		total += skb_queue_len(&sta->ps_tx_buf);
	}
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	rcu_read_unlock();
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	local->total_ps_buffered = total;
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#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
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	printk(KERN_DEBUG "%s: PS buffers full - purged %d frames\n",
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	       wiphy_name(local->hw.wiphy), purged);
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#endif
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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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	/*
	 * broadcast/multicast frame
	 *
	 * If any of the associated stations is in power save mode,
	 * 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 only in AP/VLAN mode */
	if (!tx->sdata->bss)
		return TX_CONTINUE;

	/* 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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	/* no stations in PS mode */
	if (!atomic_read(&tx->sdata->bss->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);

	if (skb_queue_len(&tx->sdata->bss->ps_bc_buf) >= AP_MAX_BC_BUFFER) {
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#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
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		if (net_ratelimit())
			printk(KERN_DEBUG "%s: BC TX buffer full - dropping the oldest frame\n",
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			       tx->sdata->name);
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#endif
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		dev_kfree_skb(skb_dequeue(&tx->sdata->bss->ps_bc_buf));
	} else
		tx->local->total_ps_buffered++;
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	skb_queue_tail(&tx->sdata->bss->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;

	if (sta == NULL || !test_sta_flags(sta, WLAN_STA_MFP))
		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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	u32 staflags;
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	if (unlikely(!sta ||
		     ieee80211_is_probe_resp(hdr->frame_control) ||
		     ieee80211_is_auth(hdr->frame_control) ||
		     ieee80211_is_assoc_resp(hdr->frame_control) ||
		     ieee80211_is_reassoc_resp(hdr->frame_control)))
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		return TX_CONTINUE;
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	staflags = get_sta_flags(sta);

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	if (unlikely((staflags & (WLAN_STA_PS_STA | WLAN_STA_PS_DRIVER)) &&
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		     !(info->flags & IEEE80211_TX_CTL_PSPOLL_RESPONSE))) {
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#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
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		printk(KERN_DEBUG "STA %pM aid %d: PS buffer (entries "
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		       "before %d)\n",
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		       sta->sta.addr, sta->sta.aid,
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		       skb_queue_len(&sta->ps_tx_buf));
#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
		if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
			purge_old_ps_buffers(tx->local);
		if (skb_queue_len(&sta->ps_tx_buf) >= STA_MAX_TX_BUFFER) {
			struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf);
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#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
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			if (net_ratelimit()) {
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				printk(KERN_DEBUG "%s: STA %pM TX "
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				       "buffer full - dropping oldest frame\n",
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				       tx->sdata->name, sta->sta.addr);
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			}
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#endif
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			dev_kfree_skb(old);
		} else
			tx->local->total_ps_buffered++;
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		/*
		 * Queue frame to be sent after STA wakes up/polls,
		 * but don't set the TIM bit if the driver is blocking
		 * wakeup or poll response transmissions anyway.
		 */
		if (skb_queue_empty(&sta->ps_tx_buf) &&
		    !(staflags & WLAN_STA_PS_DRIVER))
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			sta_info_set_tim_bit(sta);

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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, tx->skb);
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		return TX_QUEUED;
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	}
#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
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	else if (unlikely(staflags & WLAN_STA_PS_STA)) {
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		printk(KERN_DEBUG "%s: STA %pM in PS mode, but pspoll "
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		       "set -> send frame\n", tx->sdata->name,
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		       sta->sta.addr);
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	}
#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */

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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
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ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
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{
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	struct ieee80211_key *key = NULL;
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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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	if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT))
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		tx->key = NULL;
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	else if (tx->sta && (key = rcu_dereference(tx->sta->key)))
		tx->key = key;
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	else if (ieee80211_is_mgmt(hdr->frame_control) &&
		 (key = rcu_dereference(tx->sdata->default_mgmt_key)))
		tx->key = key;
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	else if ((key = rcu_dereference(tx->sdata->default_key)))
		tx->key = key;
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	else if (tx->sdata->drop_unencrypted &&
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		 (tx->skb->protocol != cpu_to_be16(ETH_P_PAE)) &&
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		 !(info->flags & IEEE80211_TX_CTL_INJECTED) &&
		 (!ieee80211_is_robust_mgmt_frame(hdr) ||
		  (ieee80211_is_action(hdr->frame_control) &&
		   tx->sta && test_sta_flags(tx->sta, WLAN_STA_MFP)))) {
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		I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted);
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		return TX_DROP;
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	} else
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		tx->key = NULL;

	if (tx->key) {
		tx->key->tx_rx_count++;
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		/* TODO: add threshold stuff again */
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		switch (tx->key->conf.alg) {
		case ALG_WEP:
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			if (ieee80211_is_auth(hdr->frame_control))
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				break;
		case ALG_TKIP:
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			if (!ieee80211_is_data_present(hdr->frame_control))
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				tx->key = NULL;
			break;
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		case ALG_CCMP:
			if (!ieee80211_is_data_present(hdr->frame_control) &&
			    !ieee80211_use_mfp(hdr->frame_control, tx->sta,
					       tx->skb))
				tx->key = NULL;
			break;
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		case ALG_AES_CMAC:
			if (!ieee80211_is_mgmt(hdr->frame_control))
				tx->key = NULL;
			break;
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		}
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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
ieee80211_tx_h_sta(struct ieee80211_tx_data *tx)
{
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);

	if (tx->sta)
		info->control.sta = &tx->sta->sta;

	return TX_CONTINUE;
}

570
static ieee80211_tx_result debug_noinline
571
ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
572
{
573
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
574 575 576 577 578 579
	struct ieee80211_hdr *hdr = (void *)tx->skb->data;
	struct ieee80211_supported_band *sband;
	struct ieee80211_rate *rate;
	int i, len;
	bool inval = false, rts = false, short_preamble = false;
	struct ieee80211_tx_rate_control txrc;
580
	u32 sta_flags;
581

582
	memset(&txrc, 0, sizeof(txrc));
583

584
	sband = tx->local->hw.wiphy->bands[tx->channel->band];
585

586
	len = min_t(int, tx->skb->len + FCS_LEN,
587
			 tx->local->hw.wiphy->frag_threshold);
588 589 590 591 592 593 594

	/* set up the tx rate control struct we give the RC algo */
	txrc.hw = local_to_hw(tx->local);
	txrc.sband = sband;
	txrc.bss_conf = &tx->sdata->vif.bss_conf;
	txrc.skb = tx->skb;
	txrc.reported_rate.idx = -1;
595 596 597 598 599
	txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[tx->channel->band];
	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;
600
	txrc.ap = tx->sdata->vif.type == NL80211_IFTYPE_AP;
601 602

	/* set up RTS protection if desired */
603
	if (len > tx->local->hw.wiphy->rts_threshold) {
604
		txrc.rts = rts = true;
605 606
	}

607 608 609 610 611 612 613 614 615 616
	/*
	 * 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) ||
	     (tx->sta && test_sta_flags(tx->sta, WLAN_STA_SHORT_PREAMBLE))))
		txrc.short_preamble = short_preamble = true;
617

618 619 620 621 622 623
	sta_flags = tx->sta ? get_sta_flags(tx->sta) : 0;

	/*
	 * Lets not bother rate control if we're associated and cannot
	 * talk to the sta. This should not happen.
	 */
624
	if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) &&
625 626 627 628 629
		 (sta_flags & WLAN_STA_ASSOC) &&
		 !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",
630
		 tx->sdata->name, hdr->addr1,
631 632
		 tx->channel->band ? 5 : 2))
		return TX_DROP;
633

634 635 636 637
	/*
	 * If we're associated with the sta at this point we know we can at
	 * least send the frame at the lowest bit rate.
	 */
638 639 640 641 642 643 644
	rate_control_get_rate(tx->sdata, tx->sta, &txrc);

	if (unlikely(info->control.rates[0].idx < 0))
		return TX_DROP;

	if (txrc.reported_rate.idx < 0)
		txrc.reported_rate = info->control.rates[0];
645

646
	if (tx->sta)
647
		tx->sta->last_tx_rate = txrc.reported_rate;
648

649 650
	if (unlikely(!info->control.rates[0].count))
		info->control.rates[0].count = 1;
651

652 653 654 655
	if (WARN_ON_ONCE((info->control.rates[0].count > 1) &&
			 (info->flags & IEEE80211_TX_CTL_NO_ACK)))
		info->control.rates[0].count = 1;

656 657 658 659 660
	if (is_multicast_ether_addr(hdr->addr1)) {
		/*
		 * XXX: verify the rate is in the basic rateset
		 */
		return TX_CONTINUE;
661 662
	}

663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687
	/*
	 * set up the RTS/CTS rate as the fastest basic rate
	 * that is not faster than the data rate
	 *
	 * XXX: Should this check all retry rates?
	 */
	if (!(info->control.rates[0].flags & IEEE80211_TX_RC_MCS)) {
		s8 baserate = 0;

		rate = &sband->bitrates[info->control.rates[0].idx];

		for (i = 0; i < sband->n_bitrates; i++) {
			/* must be a basic rate */
			if (!(tx->sdata->vif.bss_conf.basic_rates & BIT(i)))
				continue;
			/* must not be faster than the data rate */
			if (sband->bitrates[i].bitrate > rate->bitrate)
				continue;
			/* maximum */
			if (sband->bitrates[baserate].bitrate <
			     sband->bitrates[i].bitrate)
				baserate = i;
		}

		info->control.rts_cts_rate_idx = baserate;
688 689
	}

690 691 692 693 694 695 696 697 698 699 700 701 702 703
	for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
		/*
		 * make sure there's no valid rate following
		 * an invalid one, just in case drivers don't
		 * take the API seriously to stop at -1.
		 */
		if (inval) {
			info->control.rates[i].idx = -1;
			continue;
		}
		if (info->control.rates[i].idx < 0) {
			inval = true;
			continue;
		}
704

705 706 707 708 709 710 711 712
		/*
		 * For now assume MCS is already set up correctly, this
		 * needs to be fixed.
		 */
		if (info->control.rates[i].flags & IEEE80211_TX_RC_MCS) {
			WARN_ON(info->control.rates[i].idx > 76);
			continue;
		}
713

714 715 716 717
		/* set up RTS protection if desired */
		if (rts)
			info->control.rates[i].flags |=
				IEEE80211_TX_RC_USE_RTS_CTS;
718

719
		/* RC is busted */
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		if (WARN_ON_ONCE(info->control.rates[i].idx >=
				 sband->n_bitrates)) {
722 723
			info->control.rates[i].idx = -1;
			continue;
724
		}
725

726 727 728 729 730 731 732 733 734 735 736 737 738
		rate = &sband->bitrates[info->control.rates[i].idx];

		/* set up short preamble */
		if (short_preamble &&
		    rate->flags & IEEE80211_RATE_SHORT_PREAMBLE)
			info->control.rates[i].flags |=
				IEEE80211_TX_RC_USE_SHORT_PREAMBLE;

		/* set up G protection */
		if (!rts && tx->sdata->vif.bss_conf.use_cts_prot &&
		    rate->flags & IEEE80211_RATE_ERP_G)
			info->control.rates[i].flags |=
				IEEE80211_TX_RC_USE_CTS_PROTECT;
739 740
	}

741 742 743
	return TX_CONTINUE;
}

744 745 746 747 748 749 750 751 752
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;

753 754 755 756 757
	/*
	 * 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.
	 */
758
	if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR))
759 760
		return TX_CONTINUE;

761 762 763 764 765 766
	if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
		return TX_CONTINUE;

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

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	/*
	 * Anything but QoS data that has a sequence number field
	 * (is long enough) gets a sequence number from the global
	 * counter.
	 */
772
	if (!ieee80211_is_data_qos(hdr->frame_control)) {
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773
		/* driver should assign sequence number */
774
		info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
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775 776 777
		/* 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;
778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802
		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;
}

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803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847
static int ieee80211_fragment(struct ieee80211_local *local,
			      struct sk_buff *skb, int hdrlen,
			      int frag_threshold)
{
	struct sk_buff *tail = skb, *tmp;
	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;

	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;
		tail->next = tmp;
		tail = tmp;
		skb_reserve(tmp, local->tx_headroom +
				 IEEE80211_ENCRYPT_HEADROOM);
		/* copy control information */
		memcpy(tmp->cb, skb->cb, sizeof(tmp->cb));
		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;
	}

	skb->len = hdrlen + per_fragm;
	return 0;
}

848
static ieee80211_tx_result debug_noinline
849 850
ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
{
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	struct sk_buff *skb = tx->skb;
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
	struct ieee80211_hdr *hdr = (void *)skb->data;
854
	int frag_threshold = tx->local->hw.wiphy->frag_threshold;
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	int hdrlen;
	int fragnum;
857 858 859 860

	if (!(tx->flags & IEEE80211_TX_FRAGMENTED))
		return TX_CONTINUE;

861 862
	/*
	 * Warn when submitting a fragmented A-MPDU frame and drop it.
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	 * This scenario is handled in ieee80211_tx_prepare but extra
864
	 * caution taken here as fragmented ampdu may cause Tx stop.
865
	 */
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866
	if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
867 868
		return TX_DROP;

869
	hdrlen = ieee80211_hdrlen(hdr->frame_control);
870

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871
	/* internal error, why is TX_FRAGMENTED set? */
872
	if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))
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873
		return TX_DROP;
874

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875 876 877 878 879 880 881 882 883 884
	/*
	 * 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.
	 */
	if (ieee80211_fragment(tx->local, skb, hdrlen, frag_threshold))
		return TX_DROP;
885

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886 887 888 889 890
	/* update duration/seq/flags of fragments */
	fragnum = 0;
	do {
		int next_len;
		const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
891

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892 893
		hdr = (void *)skb->data;
		info = IEEE80211_SKB_CB(skb);
894

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895 896 897
		if (skb->next) {
			hdr->frame_control |= morefrags;
			next_len = skb->next->len;
898 899 900 901 902 903 904 905 906 907
			/*
			 * 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;
			info->control.rates[4].idx = -1;
			BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 5);
			info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
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908 909 910
		} else {
			hdr->frame_control &= ~morefrags;
			next_len = 0;
911
		}
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912 913 914 915
		hdr->duration_id = ieee80211_duration(tx, 0, next_len);
		hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG);
		fragnum++;
	} while ((skb = skb->next));
916

917
	return TX_CONTINUE;
918 919
}

920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936
static ieee80211_tx_result debug_noinline
ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
{
	struct sk_buff *skb = tx->skb;

	if (!tx->sta)
		return TX_CONTINUE;

	tx->sta->tx_packets++;
	do {
		tx->sta->tx_fragments++;
		tx->sta->tx_bytes += skb->len;
	} while ((skb = skb->next));

	return TX_CONTINUE;
}

937
static ieee80211_tx_result debug_noinline
938 939 940 941 942 943 944 945 946 947 948 949
ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
{
	if (!tx->key)
		return TX_CONTINUE;

	switch (tx->key->conf.alg) {
	case ALG_WEP:
		return ieee80211_crypto_wep_encrypt(tx);
	case ALG_TKIP:
		return ieee80211_crypto_tkip_encrypt(tx);
	case ALG_CCMP:
		return ieee80211_crypto_ccmp_encrypt(tx);
950 951
	case ALG_AES_CMAC:
		return ieee80211_crypto_aes_cmac_encrypt(tx);
952 953 954 955 956 957 958
	}

	/* not reached */
	WARN_ON(1);
	return TX_DROP;
}

959
static ieee80211_tx_result debug_noinline
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ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
{
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	struct sk_buff *skb = tx->skb;
	struct ieee80211_hdr *hdr;
	int next_len;
	bool group_addr;
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967 968
	do {
		hdr = (void *) skb->data;
969 970
		if (unlikely(ieee80211_is_pspoll(hdr->frame_control)))
			break; /* must not overwrite AID */
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		next_len = skb->next ? skb->next->len : 0;
		group_addr = is_multicast_ether_addr(hdr->addr1);
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		hdr->duration_id =
			ieee80211_duration(tx, group_addr, next_len);
	} while ((skb = skb->next));
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	return TX_CONTINUE;
}

981 982 983 984 985 986
/* actual transmit path */

/*
 * deal with packet injection down monitor interface
 * with Radiotap Header -- only called for monitor mode interface
 */
987 988
static bool __ieee80211_parse_tx_radiotap(struct ieee80211_tx_data *tx,
					  struct sk_buff *skb)
989 990 991 992 993 994 995 996 997 998 999 1000
{
	/*
	 * this is the moment to interpret and discard the radiotap header that
	 * must be at the start of the packet injected in Monitor mode
	 *
	 * Need to take some care with endian-ness since radiotap
	 * args are little-endian
	 */

	struct ieee80211_radiotap_iterator iterator;
	struct ieee80211_radiotap_header *rthdr =
		(struct ieee80211_radiotap_header *) skb->data;
1001
	struct ieee80211_supported_band *sband;
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1002
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1003 1004
	int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len);

1005
	sband = tx->local->hw.wiphy->bands[tx->channel->band];
1006

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	info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1008
	tx->flags &= ~IEEE80211_TX_FRAGMENTED;
1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039

	/*
	 * 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))
1040
					return false;
1041 1042 1043

				skb_trim(skb, skb->len - FCS_LEN);
			}
1044
			if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
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				info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT;
1046
			if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
1047
				tx->flags |= IEEE80211_TX_FRAGMENTED;
1048 1049
			break;

1050 1051 1052 1053 1054 1055
		/*
		 * Please update the file
		 * Documentation/networking/mac80211-injection.txt
		 * when parsing new fields here.
		 */

1056 1057 1058 1059 1060 1061
		default:
			break;
		}
	}

	if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
1062
		return false;
1063 1064 1065 1066 1067 1068 1069 1070

	/*
	 * remove the radiotap header
	 * iterator->max_length was sanity-checked against
	 * skb->len by iterator init
	 */
	skb_pull(skb, iterator.max_length);

1071
	return true;
1072 1073
}

1074 1075 1076
/*
 * initialises @tx
 */
1077
static ieee80211_tx_result
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ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
		     struct ieee80211_tx_data *tx,
		     struct sk_buff *skb)
1081
{
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	struct ieee80211_local *local = sdata->local;
1083
	struct ieee80211_hdr *hdr;
1084
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
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	int hdrlen, tid;
	u8 *qc, *state;
1087
	bool queued = false;
1088 1089 1090 1091

	memset(tx, 0, sizeof(*tx));
	tx->skb = skb;
	tx->local = local;
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	tx->sdata = sdata;
1093
	tx->channel = local->hw.conf.channel;
1094
	/*
1095 1096
	 * Set this flag (used below to indicate "automatic fragmentation"),
	 * it will be cleared/left by radiotap as desired.
1097
	 */
1098
	tx->flags |= IEEE80211_TX_FRAGMENTED;
1099 1100

	/* process and remove the injection radiotap header */
1101
	if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED)) {
1102
		if (!__ieee80211_parse_tx_radiotap(tx, skb))
1103
			return TX_DROP;
1104

1105
		/*
1106 1107 1108
		 * __ieee80211_parse_tx_radiotap has now removed
		 * the radiotap header that was present and pre-filled
		 * 'tx' with tx control information.
1109 1110 1111
		 */
	}

1112 1113 1114 1115 1116 1117 1118
	/*
	 * If this flag is set to true anywhere, and we get here,
	 * we are doing the needed processing, so remove the flag
	 * now.
	 */
	info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING;

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

1121
	if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1122
		tx->sta = rcu_dereference(sdata->u.vlan.sta);
1123 1124 1125
		if (!tx->sta && sdata->dev->ieee80211_ptr->use_4addr)
			return TX_DROP;
	}
1126
	if (!tx->sta)
1127
		tx->sta = sta_info_get(sdata, hdr->addr1);
1128

1129 1130
	if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) &&
	    (local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION)) {
1131
		unsigned long flags;
1132 1133
		struct tid_ampdu_tx *tid_tx;

S
Sujith 已提交
1134 1135 1136
		qc = ieee80211_get_qos_ctl(hdr);
		tid = *qc & IEEE80211_QOS_CTL_TID_MASK;

1137
		spin_lock_irqsave(&tx->sta->lock, flags);
1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151
		/*
		 * XXX: This spinlock could be fairly expensive, but see the
		 *	comment in agg-tx.c:ieee80211_agg_tx_operational().
		 *	One way to solve this would be to do something RCU-like
		 *	for managing the tid_tx struct and using atomic bitops
		 *	for the actual state -- by introducing an actual
		 *	'operational' bit that would be possible. It would
		 *	require changing ieee80211_agg_tx_operational() to
		 *	set that bit, and changing the way tid_tx is managed
		 *	everywhere, including races between that bit and
		 *	tid_tx going away (tid_tx being added can be easily
		 *	committed to memory before the 'operational' bit).
		 */
		tid_tx = tx->sta->ampdu_mlme.tid_tx[tid];
S
Sujith 已提交
1152
		state = &tx->sta->ampdu_mlme.tid_state_tx[tid];
1153
		if (*state == HT_AGG_STATE_OPERATIONAL) {
S
Sujith 已提交
1154
			info->flags |= IEEE80211_TX_CTL_AMPDU;
1155 1156 1157
		} else if (*state != HT_AGG_STATE_IDLE) {
			/* in progress */
			queued = true;
1158
			info->control.vif = &sdata->vif;
1159 1160 1161
			info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
			__skb_queue_tail(&tid_tx->pending, skb);
		}
1162
		spin_unlock_irqrestore(&tx->sta->lock, flags);
1163 1164 1165

		if (unlikely(queued))
			return TX_QUEUED;
S
Sujith 已提交
1166 1167
	}

1168
	if (is_multicast_ether_addr(hdr->addr1)) {
1169
		tx->flags &= ~IEEE80211_TX_UNICAST;
1170
		info->flags |= IEEE80211_TX_CTL_NO_ACK;
1171
	} else {
1172
		tx->flags |= IEEE80211_TX_UNICAST;
1173 1174 1175 1176
		if (unlikely(local->wifi_wme_noack_test))
			info->flags |= IEEE80211_TX_CTL_NO_ACK;
		else
			info->flags &= ~IEEE80211_TX_CTL_NO_ACK;
1177
	}
1178

1179 1180
	if (tx->flags & IEEE80211_TX_FRAGMENTED) {
		if ((tx->flags & IEEE80211_TX_UNICAST) &&
1181
		    skb->len + FCS_LEN > local->hw.wiphy->frag_threshold &&
1182
		    !(info->flags & IEEE80211_TX_CTL_AMPDU))
1183
			tx->flags |= IEEE80211_TX_FRAGMENTED;
1184
		else
1185
			tx->flags &= ~IEEE80211_TX_FRAGMENTED;
1186 1187
	}

1188
	if (!tx->sta)
1189
		info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1190
	else if (test_and_clear_sta_flags(tx->sta, WLAN_STA_CLEAR_PS_FILT))
1191
		info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1192

1193
	hdrlen = ieee80211_hdrlen(hdr->frame_control);
1194 1195 1196 1197
	if (skb->len > hdrlen + sizeof(rfc1042_header) + 2) {
		u8 *pos = &skb->data[hdrlen + sizeof(rfc1042_header)];
		tx->ethertype = (pos[0] << 8) | pos[1];
	}
1198
	info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
1199

1200
	return TX_CONTINUE;
1201 1202
}

J
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1203
static int __ieee80211_tx(struct ieee80211_local *local,
1204
			  struct sk_buff **skbp,
J
Johannes Berg 已提交
1205 1206
			  struct sta_info *sta,
			  bool txpending)
1207
{
1208
	struct sk_buff *skb = *skbp, *next;
1209
	struct ieee80211_tx_info *info;
1210
	struct ieee80211_sub_if_data *sdata;
J
Johannes Berg 已提交
1211
	unsigned long flags;
1212
	int ret, len;
J
Johannes Berg 已提交
1213
	bool fragm = false;
1214

J
Johannes Berg 已提交
1215
	while (skb) {
J
Johannes Berg 已提交
1216 1217 1218 1219 1220 1221 1222 1223 1224 1225
		int q = skb_get_queue_mapping(skb);

		spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
		ret = IEEE80211_TX_OK;
		if (local->queue_stop_reasons[q] ||
		    (!txpending && !skb_queue_empty(&local->pending[q])))
			ret = IEEE80211_TX_PENDING;
		spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
		if (ret != IEEE80211_TX_OK)
			return ret;
1226

1227 1228 1229
		info = IEEE80211_SKB_CB(skb);

		if (fragm)
1230
			info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT |
1231
					 IEEE80211_TX_CTL_FIRST_FRAGMENT);
1232

J
Johannes Berg 已提交
1233
		next = skb->next;
1234
		len = skb->len;
1235

J
Johannes Berg 已提交
1236 1237 1238
		if (next)
			info->flags |= IEEE80211_TX_CTL_MORE_FRAMES;

1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253
		sdata = vif_to_sdata(info->control.vif);

		switch (sdata->vif.type) {
		case NL80211_IFTYPE_MONITOR:
			info->control.vif = NULL;
			break;
		case NL80211_IFTYPE_AP_VLAN:
			info->control.vif = &container_of(sdata->bss,
				struct ieee80211_sub_if_data, u.ap)->vif;
			break;
		default:
			/* keep */
			break;
		}

1254
		ret = drv_tx(local, skb);
1255 1256 1257 1258
		if (WARN_ON(ret != NETDEV_TX_OK && skb->len != len)) {
			dev_kfree_skb(skb);
			ret = NETDEV_TX_OK;
		}
1259 1260
		if (ret != NETDEV_TX_OK) {
			info->control.vif = &sdata->vif;
J
Johannes Berg 已提交
1261
			return IEEE80211_TX_AGAIN;
1262 1263
		}

1264
		*skbp = skb = next;
J
Johannes Berg 已提交
1265 1266
		ieee80211_led_tx(local, 1);
		fragm = true;
1267
	}
J
Johannes Berg 已提交
1268

1269 1270 1271
	return IEEE80211_TX_OK;
}

1272 1273 1274 1275 1276 1277 1278 1279 1280
/*
 * 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)
{
	struct sk_buff *skb = tx->skb;
	ieee80211_tx_result res = TX_DROP;

1281 1282 1283 1284 1285 1286 1287
#define CALL_TXH(txh) \
	do {				\
		res = txh(tx);		\
		if (res != TX_CONTINUE)	\
			goto txh_done;	\
	} while (0)

1288
	CALL_TXH(ieee80211_tx_h_dynamic_ps);
1289 1290 1291
	CALL_TXH(ieee80211_tx_h_check_assoc);
	CALL_TXH(ieee80211_tx_h_ps_buf);
	CALL_TXH(ieee80211_tx_h_select_key);
1292
	CALL_TXH(ieee80211_tx_h_sta);
1293
	CALL_TXH(ieee80211_tx_h_michael_mic_add);
1294 1295
	if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
		CALL_TXH(ieee80211_tx_h_rate_ctrl);
1296 1297
	CALL_TXH(ieee80211_tx_h_sequence);
	CALL_TXH(ieee80211_tx_h_fragment);
1298
	/* handlers after fragment must be aware of tx info fragmentation! */
1299 1300 1301
	CALL_TXH(ieee80211_tx_h_stats);
	CALL_TXH(ieee80211_tx_h_encrypt);
	CALL_TXH(ieee80211_tx_h_calculate_duration);
1302
#undef CALL_TXH
1303

1304
 txh_done:
1305
	if (unlikely(res == TX_DROP)) {
1306
		I802_DEBUG_INC(tx->local->tx_handlers_drop);
J
Johannes Berg 已提交
1307 1308 1309 1310 1311 1312 1313
		while (skb) {
			struct sk_buff *next;

			next = skb->next;
			dev_kfree_skb(skb);
			skb = next;
		}
1314 1315
		return -1;
	} else if (unlikely(res == TX_QUEUED)) {
1316
		I802_DEBUG_INC(tx->local->tx_handlers_queued);
1317 1318 1319 1320 1321 1322
		return -1;
	}

	return 0;
}

J
Johannes Berg 已提交
1323 1324
static void ieee80211_tx(struct ieee80211_sub_if_data *sdata,
			 struct sk_buff *skb, bool txpending)
1325
{
J
Johannes Berg 已提交
1326
	struct ieee80211_local *local = sdata->local;
1327
	struct ieee80211_tx_data tx;
1328
	ieee80211_tx_result res_prepare;
1329
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1330 1331 1332
	struct sk_buff *next;
	unsigned long flags;
	int ret, retries;
1333
	u16 queue;
1334

1335 1336
	queue = skb_get_queue_mapping(skb);

1337 1338
	if (unlikely(skb->len < 10)) {
		dev_kfree_skb(skb);
1339
		return;
1340 1341
	}

1342 1343
	rcu_read_lock();

1344
	/* initialises tx */
J
Johannes Berg 已提交
1345
	res_prepare = ieee80211_tx_prepare(sdata, &tx, skb);
1346

1347
	if (unlikely(res_prepare == TX_DROP)) {
1348
		dev_kfree_skb(skb);
1349
		rcu_read_unlock();
1350 1351 1352 1353
		return;
	} else if (unlikely(res_prepare == TX_QUEUED)) {
		rcu_read_unlock();
		return;
1354 1355
	}

1356
	tx.channel = local->hw.conf.channel;
1357
	info->band = tx.channel->band;
1358

1359 1360
	if (invoke_tx_handlers(&tx))
		goto out;
1361

1362 1363
	retries = 0;
 retry:
J
Johannes Berg 已提交
1364
	ret = __ieee80211_tx(local, &tx.skb, tx.sta, txpending);
1365 1366 1367 1368
	switch (ret) {
	case IEEE80211_TX_OK:
		break;
	case IEEE80211_TX_AGAIN:
1369 1370 1371 1372 1373
		/*
		 * Since there are no fragmented frames on A-MPDU
		 * queues, there's no reason for a driver to reject
		 * a frame there, warn and drop it.
		 */
1374 1375 1376 1377 1378
		if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
			goto drop;
		/* fall through */
	case IEEE80211_TX_PENDING:
		skb = tx.skb;
1379

1380
		spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1381

J
Johannes Berg 已提交
1382 1383 1384 1385 1386 1387
		if (local->queue_stop_reasons[queue] ||
		    !skb_queue_empty(&local->pending[queue])) {
			/*
			 * if queue is stopped, queue up frames for later
			 * transmission from the tasklet
			 */
1388 1389 1390
			do {
				next = skb->next;
				skb->next = NULL;
1391
				if (unlikely(txpending))
J
Johannes Berg 已提交
1392 1393
					__skb_queue_head(&local->pending[queue],
							 skb);
1394
				else
J
Johannes Berg 已提交
1395 1396
					__skb_queue_tail(&local->pending[queue],
							 skb);
1397 1398 1399 1400 1401
			} while ((skb = next));

			spin_unlock_irqrestore(&local->queue_stop_reason_lock,
					       flags);
		} else {
J
Johannes Berg 已提交
1402 1403 1404 1405
			/*
			 * otherwise retry, but this is a race condition or
			 * a driver bug (which we warn about if it persists)
			 */
1406 1407 1408 1409
			spin_unlock_irqrestore(&local->queue_stop_reason_lock,
					       flags);

			retries++;
J
Johannes Berg 已提交
1410
			if (WARN(retries > 10, "tx refused but queue active\n"))
1411
				goto drop;
1412 1413 1414
			goto retry;
		}
	}
1415
 out:
1416
	rcu_read_unlock();
1417
	return;
1418 1419

 drop:
1420
	rcu_read_unlock();
J
Johannes Berg 已提交
1421 1422 1423 1424 1425 1426 1427

	skb = tx.skb;
	while (skb) {
		next = skb->next;
		dev_kfree_skb(skb);
		skb = next;
	}
1428 1429 1430 1431
}

/* device xmit handlers */

1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470
static int ieee80211_skb_resize(struct ieee80211_local *local,
				struct sk_buff *skb,
				int head_need, bool may_encrypt)
{
	int tail_need = 0;

	/*
	 * This could be optimised, devices that do full hardware
	 * crypto (including TKIP MMIC) need no tailroom... But we
	 * have no drivers for such devices currently.
	 */
	if (may_encrypt) {
		tail_need = IEEE80211_ENCRYPT_TAILROOM;
		tail_need -= skb_tailroom(skb);
		tail_need = max_t(int, tail_need, 0);
	}

	if (head_need || tail_need) {
		/* Sorry. Can't account for this any more */
		skb_orphan(skb);
	}

	if (skb_header_cloned(skb))
		I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
	else
		I802_DEBUG_INC(local->tx_expand_skb_head);

	if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
		printk(KERN_DEBUG "%s: failed to reallocate TX buffer\n",
		       wiphy_name(local->hw.wiphy));
		return -ENOMEM;
	}

	/* update truesize too */
	skb->truesize += head_need + tail_need;

	return 0;
}

J
Johannes Berg 已提交
1471 1472
static void ieee80211_xmit(struct ieee80211_sub_if_data *sdata,
			   struct sk_buff *skb)
1473
{
J
Johannes Berg 已提交
1474
	struct ieee80211_local *local = sdata->local;
1475
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1476
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
J
Johannes Berg 已提交
1477
	struct ieee80211_sub_if_data *tmp_sdata;
1478
	int headroom;
1479
	bool may_encrypt;
1480

1481 1482
	rcu_read_lock();

1483
	if (unlikely(sdata->vif.type == NL80211_IFTYPE_MONITOR)) {
1484 1485 1486 1487 1488 1489
		int hdrlen;
		u16 len_rthdr;

		info->flags |= IEEE80211_TX_CTL_INJECTED;

		len_rthdr = ieee80211_get_radiotap_len(skb->data);
1490
		hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504
		hdrlen = ieee80211_hdrlen(hdr->frame_control);

		/* check the header is complete in the frame */
		if (likely(skb->len >= len_rthdr + hdrlen)) {
			/*
			 * We process outgoing injected frames that have a
			 * local address we handle as though they are our
			 * own frames.
			 * This code here isn't entirely correct, the local
			 * MAC address is not necessarily enough to find
			 * the interface to use; for that proper VLAN/WDS
			 * support we will need a different mechanism.
			 */

J
Johannes Berg 已提交
1505
			list_for_each_entry_rcu(tmp_sdata, &local->interfaces,
1506
						list) {
1507
				if (!ieee80211_sdata_running(tmp_sdata))
1508
					continue;
J
Johannes Berg 已提交
1509
				if (tmp_sdata->vif.type != NL80211_IFTYPE_AP)
1510
					continue;
1511
				if (compare_ether_addr(tmp_sdata->vif.addr,
1512
						       hdr->addr2) == 0) {
J
Johannes Berg 已提交
1513
					sdata = tmp_sdata;
1514 1515 1516 1517
					break;
				}
			}
		}
1518 1519
	}

J
Johannes Berg 已提交
1520
	may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT);
1521

J
Johannes Berg 已提交
1522
	headroom = local->tx_headroom;
1523 1524 1525 1526 1527
	if (may_encrypt)
		headroom += IEEE80211_ENCRYPT_HEADROOM;
	headroom -= skb_headroom(skb);
	headroom = max_t(int, 0, headroom);

J
Johannes Berg 已提交
1528
	if (ieee80211_skb_resize(local, skb, headroom, may_encrypt)) {
1529
		dev_kfree_skb(skb);
1530
		rcu_read_unlock();
J
Johannes Berg 已提交
1531
		return;
1532 1533
	}

1534
	info->control.vif = &sdata->vif;
1535

1536 1537 1538 1539 1540
	if (ieee80211_vif_is_mesh(&sdata->vif) &&
	    ieee80211_is_data(hdr->frame_control) &&
		!is_multicast_ether_addr(hdr->addr1))
			if (mesh_nexthop_lookup(skb, sdata)) {
				/* skb queued: don't free */
1541
				rcu_read_unlock();
1542 1543 1544
				return;
			}

1545
	ieee80211_set_qos_hdr(local, skb);
J
Johannes Berg 已提交
1546
	ieee80211_tx(sdata, skb, false);
1547
	rcu_read_unlock();
1548 1549
}

1550 1551
netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
					 struct net_device *dev)
1552 1553
{
	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1554
	struct ieee80211_channel *chan = local->hw.conf.channel;
1555 1556
	struct ieee80211_radiotap_header *prthdr =
		(struct ieee80211_radiotap_header *)skb->data;
J
Johannes Berg 已提交
1557
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1558
	u16 len_rthdr;
1559

1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579
	/*
	 * 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.
	 */
	if ((chan->flags & (IEEE80211_CHAN_NO_IBSS | IEEE80211_CHAN_RADAR |
	     IEEE80211_CHAN_PASSIVE_SCAN)))
		goto fail;

1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593
	/* 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 */
1594 1595 1596 1597 1598 1599 1600

	/*
	 * 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
	 */
1601
	skb_set_mac_header(skb, len_rthdr);
1602
	/*
1603 1604
	 * 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
1605
	 */
1606 1607
	skb_set_network_header(skb, len_rthdr);
	skb_set_transport_header(skb, len_rthdr);
1608

J
Johannes Berg 已提交
1609 1610
	memset(info, 0, sizeof(*info));

1611 1612
	info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;

J
Johannes Berg 已提交
1613 1614
	/* pass the radiotap header up to xmit */
	ieee80211_xmit(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1615
	return NETDEV_TX_OK;
1616 1617 1618 1619

fail:
	dev_kfree_skb(skb);
	return NETDEV_TX_OK; /* meaning, we dealt with the skb */
1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636
}

/**
 * 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).
 */
1637 1638
netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
				    struct net_device *dev)
1639
{
1640 1641
	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
	struct ieee80211_local *local = sdata->local;
J
Johannes Berg 已提交
1642
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1643
	int ret = NETDEV_TX_BUSY, head_need;
1644 1645
	u16 ethertype, hdrlen,  meshhdrlen = 0;
	__le16 fc;
1646
	struct ieee80211_hdr hdr;
1647
	struct ieee80211s_hdr mesh_hdr;
1648 1649
	const u8 *encaps_data;
	int encaps_len, skip_header_bytes;
1650
	int nh_pos, h_pos;
1651
	struct sta_info *sta = NULL;
1652
	u32 sta_flags = 0;
1653 1654

	if (unlikely(skb->len < ETH_HLEN)) {
1655
		ret = NETDEV_TX_OK;
1656 1657 1658 1659 1660 1661 1662 1663 1664
		goto fail;
	}

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

	/* convert Ethernet header to proper 802.11 header (based on
	 * operation mode) */
	ethertype = (skb->data[12] << 8) | skb->data[13];
1665
	fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
1666

1667
	switch (sdata->vif.type) {
1668
	case NL80211_IFTYPE_AP_VLAN:
1669
		rcu_read_lock();
1670
		sta = rcu_dereference(sdata->u.vlan.sta);
1671 1672 1673 1674
		if (sta) {
			fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
			/* RA TA DA SA */
			memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN);
1675
			memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1676 1677 1678 1679 1680 1681 1682 1683 1684 1685
			memcpy(hdr.addr3, skb->data, ETH_ALEN);
			memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
			hdrlen = 30;
			sta_flags = get_sta_flags(sta);
		}
		rcu_read_unlock();
		if (sta)
			break;
		/* fall through */
	case NL80211_IFTYPE_AP:
1686
		fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
1687 1688
		/* DA BSSID SA */
		memcpy(hdr.addr1, skb->data, ETH_ALEN);
1689
		memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1690 1691
		memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
		hdrlen = 24;
1692
		break;
1693
	case NL80211_IFTYPE_WDS:
1694
		fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1695 1696
		/* RA TA DA SA */
		memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
1697
		memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1698 1699 1700
		memcpy(hdr.addr3, skb->data, ETH_ALEN);
		memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
		hdrlen = 30;
1701
		break;
1702
#ifdef CONFIG_MAC80211_MESH
1703
	case NL80211_IFTYPE_MESH_POINT:
1704
		if (!sdata->u.mesh.mshcfg.dot11MeshTTL) {
1705
			/* Do not send frames with mesh_ttl == 0 */
1706
			sdata->u.mesh.mshstats.dropped_frames_ttl++;
1707
			ret = NETDEV_TX_OK;
1708
			goto fail;
1709
		}
1710

1711 1712
		if (compare_ether_addr(sdata->vif.addr,
				       skb->data + ETH_ALEN) == 0) {
1713 1714 1715 1716
			hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
					skb->data, skb->data + ETH_ALEN);
			meshhdrlen = ieee80211_new_mesh_header(&mesh_hdr,
					sdata, NULL, NULL, NULL);
1717 1718 1719
		} else {
			/* packet from other interface */
			struct mesh_path *mppath;
1720
			int is_mesh_mcast = 1;
1721
			const u8 *mesh_da;
1722

1723
			rcu_read_lock();
1724
			if (is_multicast_ether_addr(skb->data))
1725 1726
				/* DA TA mSA AE:SA */
				mesh_da = skb->data;
1727
			else {
1728 1729 1730
				static const u8 bcast[ETH_ALEN] =
					{ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };

1731
				mppath = mpp_path_lookup(skb->data, sdata);
1732 1733 1734 1735
				if (mppath) {
					/* RA TA mDA mSA AE:DA SA */
					mesh_da = mppath->mpp;
					is_mesh_mcast = 0;
1736
				} else {
1737
					/* DA TA mSA AE:SA */
1738 1739
					mesh_da = bcast;
				}
1740
			}
1741
			hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
1742
					mesh_da, sdata->vif.addr);
1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757
			rcu_read_unlock();
			if (is_mesh_mcast)
				meshhdrlen =
					ieee80211_new_mesh_header(&mesh_hdr,
							sdata,
							skb->data + ETH_ALEN,
							NULL,
							NULL);
			else
				meshhdrlen =
					ieee80211_new_mesh_header(&mesh_hdr,
							sdata,
							NULL,
							skb->data,
							skb->data + ETH_ALEN);
1758 1759

		}
1760 1761
		break;
#endif
1762
	case NL80211_IFTYPE_STATION:
1763
		memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
1764
		if (sdata->u.mgd.use_4addr && ethertype != ETH_P_PAE) {
1765 1766
			fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
			/* RA TA DA SA */
1767
			memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1768 1769 1770 1771 1772 1773 1774 1775 1776 1777
			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 */
			memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
			memcpy(hdr.addr3, skb->data, ETH_ALEN);
			hdrlen = 24;
		}
1778
		break;
1779
	case NL80211_IFTYPE_ADHOC:
1780 1781 1782
		/* DA SA BSSID */
		memcpy(hdr.addr1, skb->data, ETH_ALEN);
		memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1783
		memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN);
1784
		hdrlen = 24;
1785 1786
		break;
	default:
1787
		ret = NETDEV_TX_OK;
1788 1789 1790
		goto fail;
	}

1791 1792 1793 1794 1795 1796
	/*
	 * There's no need to try to look up the destination
	 * if it is a multicast address (which can only happen
	 * in AP mode)
	 */
	if (!is_multicast_ether_addr(hdr.addr1)) {
1797
		rcu_read_lock();
1798 1799
		sta = sta_info_get(sdata, hdr.addr1);
		if (sta)
1800
			sta_flags = get_sta_flags(sta);
1801
		rcu_read_unlock();
1802 1803
	}

1804
	/* receiver and we are QoS enabled, use a QoS type frame */
1805
	if ((sta_flags & WLAN_STA_WME) && local->hw.queues >= 4) {
1806
		fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
1807 1808 1809 1810
		hdrlen += 2;
	}

	/*
1811 1812
	 * Drop unicast frames to unauthorised stations unless they are
	 * EAPOL frames from the local station.
1813
	 */
1814 1815
	if (!ieee80211_vif_is_mesh(&sdata->vif) &&
		unlikely(!is_multicast_ether_addr(hdr.addr1) &&
1816 1817
		      !(sta_flags & WLAN_STA_AUTHORIZED) &&
		      !(ethertype == ETH_P_PAE &&
1818
		       compare_ether_addr(sdata->vif.addr,
1819 1820 1821
					  skb->data + ETH_ALEN) == 0))) {
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
		if (net_ratelimit())
1822
			printk(KERN_DEBUG "%s: dropped frame to %pM"
1823
			       " (unauthorized port)\n", dev->name,
1824
			       hdr.addr1);
1825 1826 1827 1828
#endif

		I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);

1829
		ret = NETDEV_TX_OK;
1830 1831 1832
		goto fail;
	}

1833
	hdr.frame_control = fc;
1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854
	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;
	} else if (ethertype >= 0x600) {
		encaps_data = rfc1042_header;
		encaps_len = sizeof(rfc1042_header);
		skip_header_bytes -= 2;
	} else {
		encaps_data = NULL;
		encaps_len = 0;
	}

	skb_pull(skb, skip_header_bytes);
	nh_pos -= skip_header_bytes;
	h_pos -= skip_header_bytes;

1855
	head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
1856

1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867
	/*
	 * 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.
	 */
1868

1869
	if (head_need > 0 || skb_cloned(skb)) {
1870 1871 1872 1873
		head_need += IEEE80211_ENCRYPT_HEADROOM;
		head_need += local->tx_headroom;
		head_need = max_t(int, 0, head_need);
		if (ieee80211_skb_resize(local, skb, head_need, true))
1874 1875 1876 1877 1878 1879 1880 1881
			goto fail;
	}

	if (encaps_data) {
		memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
		nh_pos += encaps_len;
		h_pos += encaps_len;
	}
1882

1883 1884 1885 1886 1887 1888
	if (meshhdrlen > 0) {
		memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
		nh_pos += meshhdrlen;
		h_pos += meshhdrlen;
	}

1889
	if (ieee80211_is_data_qos(fc)) {
1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901
		__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);

1902 1903 1904
	nh_pos += hdrlen;
	h_pos += hdrlen;

1905 1906
	dev->stats.tx_packets++;
	dev->stats.tx_bytes += skb->len;
1907 1908 1909 1910 1911 1912 1913 1914

	/* 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);

J
Johannes Berg 已提交
1915 1916
	memset(info, 0, sizeof(*info));

1917
	dev->trans_start = jiffies;
J
Johannes Berg 已提交
1918
	ieee80211_xmit(sdata, skb);
1919

1920
	return NETDEV_TX_OK;
1921 1922

 fail:
1923
	if (ret == NETDEV_TX_OK)
1924 1925 1926 1927 1928 1929
		dev_kfree_skb(skb);

	return ret;
}


1930 1931 1932 1933
/*
 * ieee80211_clear_tx_pending may not be called in a context where
 * it is possible that it packets could come in again.
 */
1934 1935
void ieee80211_clear_tx_pending(struct ieee80211_local *local)
{
J
Johannes Berg 已提交
1936
	int i;
1937

1938 1939
	for (i = 0; i < local->hw.queues; i++)
		skb_queue_purge(&local->pending[i]);
1940 1941
}

1942 1943 1944 1945 1946 1947 1948 1949 1950 1951
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;
	int ret;
	bool result = true;

1952
	sdata = vif_to_sdata(info->control.vif);
1953 1954

	if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) {
1955
		ieee80211_tx(sdata, skb, true);
1956 1957
	} else {
		hdr = (struct ieee80211_hdr *)skb->data;
1958
		sta = sta_info_get(sdata, hdr->addr1);
1959

J
Johannes Berg 已提交
1960
		ret = __ieee80211_tx(local, &skb, sta, true);
1961 1962 1963 1964 1965 1966 1967
		if (ret != IEEE80211_TX_OK)
			result = false;
	}

	return result;
}

1968
/*
J
Johannes Berg 已提交
1969
 * Transmit all pending packets. Called from tasklet.
1970
 */
1971 1972 1973
void ieee80211_tx_pending(unsigned long data)
{
	struct ieee80211_local *local = (struct ieee80211_local *)data;
1974
	unsigned long flags;
1975
	int i;
J
Johannes Berg 已提交
1976
	bool txok;
1977

1978
	rcu_read_lock();
1979

J
Johannes Berg 已提交
1980
	spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1981 1982 1983 1984 1985
	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
1986
		if (local->queue_stop_reasons[i] ||
1987
		    skb_queue_empty(&local->pending[i]))
1988
			continue;
1989

1990
		while (!skb_queue_empty(&local->pending[i])) {
J
Johannes Berg 已提交
1991
			struct sk_buff *skb = __skb_dequeue(&local->pending[i]);
1992 1993 1994
			struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
			struct ieee80211_sub_if_data *sdata;

1995 1996 1997 1998 1999
			if (WARN_ON(!info->control.vif)) {
				kfree_skb(skb);
				continue;
			}

2000
			sdata = vif_to_sdata(info->control.vif);
J
Johannes Berg 已提交
2001 2002 2003 2004 2005 2006 2007 2008 2009
			spin_unlock_irqrestore(&local->queue_stop_reason_lock,
						flags);

			txok = ieee80211_tx_pending_skb(local, skb);
			if (!txok)
				__skb_queue_head(&local->pending[i], skb);
			spin_lock_irqsave(&local->queue_stop_reason_lock,
					  flags);
			if (!txok)
2010
				break;
2011 2012
		}
	}
J
Johannes Berg 已提交
2013
	spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
2014

2015
	rcu_read_unlock();
2016 2017 2018 2019
}

/* functions for drivers to get certain frames */

R
Rami Rosen 已提交
2020
static void ieee80211_beacon_add_tim(struct ieee80211_if_ap *bss,
2021 2022
				     struct sk_buff *skb,
				     struct beacon_data *beacon)
2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036
{
	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. */
	if (atomic_read(&bss->num_sta_ps) > 0)
		/* in the hope that this is faster than
		 * checking byte-for-byte */
		have_bits = !bitmap_empty((unsigned long*)bss->tim,
					  IEEE80211_MAX_AID+1);

	if (bss->dtim_count == 0)
2037
		bss->dtim_count = beacon->dtim_period - 1;
2038 2039 2040 2041 2042 2043 2044
	else
		bss->dtim_count--;

	tim = pos = (u8 *) skb_put(skb, 6);
	*pos++ = WLAN_EID_TIM;
	*pos++ = 4;
	*pos++ = bss->dtim_count;
2045
	*pos++ = beacon->dtim_period;
2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077 2078 2079 2080 2081

	if (bss->dtim_count == 0 && !skb_queue_empty(&bss->ps_bc_buf))
		aid0 = 1;

	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++) {
			if (bss->tim[i]) {
				n1 = i & 0xfe;
				break;
			}
		}
		n2 = n1;
		for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
			if (bss->tim[i]) {
				n2 = i;
				break;
			}
		}

		/* Bitmap control */
		*pos++ = n1 | aid0;
		/* Part Virt Bitmap */
		memcpy(pos, bss->tim + n1, n2 - n1 + 1);

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

2082 2083 2084
struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
					 struct ieee80211_vif *vif,
					 u16 *tim_offset, u16 *tim_length)
2085 2086
{
	struct ieee80211_local *local = hw_to_local(hw);
2087
	struct sk_buff *skb = NULL;
2088
	struct ieee80211_tx_info *info;
2089 2090
	struct ieee80211_sub_if_data *sdata = NULL;
	struct ieee80211_if_ap *ap = NULL;
2091
	struct beacon_data *beacon;
2092
	struct ieee80211_supported_band *sband;
2093
	enum ieee80211_band band = local->hw.conf.channel->band;
2094
	struct ieee80211_tx_rate_control txrc;
2095

2096
	sband = local->hw.wiphy->bands[band];
2097 2098

	rcu_read_lock();
2099

2100
	sdata = vif_to_sdata(vif);
2101

2102 2103 2104 2105 2106
	if (tim_offset)
		*tim_offset = 0;
	if (tim_length)
		*tim_length = 0;

2107
	if (sdata->vif.type == NL80211_IFTYPE_AP) {
2108 2109
		ap = &sdata->u.ap;
		beacon = rcu_dereference(ap->beacon);
J
Johannes Berg 已提交
2110 2111 2112 2113 2114 2115 2116 2117 2118 2119
		if (ap && beacon) {
			/*
			 * 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;
2120

J
Johannes Berg 已提交
2121 2122 2123
			skb_reserve(skb, local->tx_headroom);
			memcpy(skb_put(skb, beacon->head_len), beacon->head,
			       beacon->head_len);
2124

2125 2126 2127 2128 2129 2130 2131 2132
			/*
			 * 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) {
R
Rami Rosen 已提交
2133
				ieee80211_beacon_add_tim(ap, skb, beacon);
2134 2135 2136 2137
			} else {
				unsigned long flags;

				spin_lock_irqsave(&local->sta_lock, flags);
R
Rami Rosen 已提交
2138
				ieee80211_beacon_add_tim(ap, skb, beacon);
2139 2140
				spin_unlock_irqrestore(&local->sta_lock, flags);
			}
2141

2142 2143 2144 2145 2146
			if (tim_offset)
				*tim_offset = beacon->head_len;
			if (tim_length)
				*tim_length = skb->len - beacon->head_len;

J
Johannes Berg 已提交
2147 2148 2149
			if (beacon->tail)
				memcpy(skb_put(skb, beacon->tail_len),
				       beacon->tail, beacon->tail_len);
2150 2151
		} else
			goto out;
2152
	} else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
2153
		struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
2154
		struct ieee80211_hdr *hdr;
2155
		struct sk_buff *presp = rcu_dereference(ifibss->presp);
2156

2157
		if (!presp)
2158 2159
			goto out;

2160
		skb = skb_copy(presp, GFP_ATOMIC);
2161 2162 2163 2164
		if (!skb)
			goto out;

		hdr = (struct ieee80211_hdr *) skb->data;
2165 2166
		hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
						 IEEE80211_STYPE_BEACON);
J
Johannes Berg 已提交
2167
	} else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2168 2169 2170
		struct ieee80211_mgmt *mgmt;
		u8 *pos;

J
Johannes Berg 已提交
2171 2172 2173 2174 2175 2176 2177 2178 2179
		/* headroom, head length, tail length and maximum TIM length */
		skb = dev_alloc_skb(local->tx_headroom + 400);
		if (!skb)
			goto out;

		skb_reserve(skb, local->hw.extra_tx_headroom);
		mgmt = (struct ieee80211_mgmt *)
			skb_put(skb, 24 + sizeof(mgmt->u.beacon));
		memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
2180 2181
		mgmt->frame_control =
		    cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_BEACON);
J
Johannes Berg 已提交
2182
		memset(mgmt->da, 0xff, ETH_ALEN);
2183 2184
		memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
		memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
J
Johannes Berg 已提交
2185
		mgmt->u.beacon.beacon_int =
2186
			cpu_to_le16(sdata->vif.bss_conf.beacon_int);
J
Johannes Berg 已提交
2187 2188 2189 2190 2191 2192
		mgmt->u.beacon.capab_info = 0x0; /* 0x0 for MPs */

		pos = skb_put(skb, 2);
		*pos++ = WLAN_EID_SSID;
		*pos++ = 0x0;

2193
		mesh_mgmt_ies_add(skb, sdata);
2194 2195
	} else {
		WARN_ON(1);
2196
		goto out;
2197 2198
	}

2199 2200
	info = IEEE80211_SKB_CB(skb);

J
Johannes Berg 已提交
2201
	info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
2202
	info->flags |= IEEE80211_TX_CTL_NO_ACK;
2203
	info->band = band;
2204 2205 2206 2207 2208 2209 2210

	memset(&txrc, 0, sizeof(txrc));
	txrc.hw = hw;
	txrc.sband = sband;
	txrc.bss_conf = &sdata->vif.bss_conf;
	txrc.skb = skb;
	txrc.reported_rate.idx = -1;
2211 2212 2213 2214 2215
	txrc.rate_idx_mask = sdata->rc_rateidx_mask[band];
	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;
2216 2217
	txrc.ap = true;
	rate_control_get_rate(sdata, NULL, &txrc);
2218 2219

	info->control.vif = vif;
2220 2221 2222

	info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
	info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
2223
 out:
2224
	rcu_read_unlock();
2225 2226
	return skb;
}
2227
EXPORT_SYMBOL(ieee80211_beacon_get_tim);
2228

2229 2230 2231 2232 2233 2234 2235 2236 2237 2238 2239 2240 2241 2242 2243 2244 2245 2246 2247 2248 2249 2250 2251 2252 2253 2254 2255 2256 2257 2258 2259 2260 2261 2262 2263 2264 2265 2266 2267 2268 2269 2270 2271 2272 2273 2274 2275 2276 2277 2278 2279 2280 2281 2282 2283 2284 2285 2286 2287 2288 2289 2290 2291 2292 2293 2294 2295 2296 2297 2298 2299 2300 2301 2302 2303 2304 2305 2306
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));
	if (!skb) {
		printk(KERN_DEBUG "%s: failed to allocate buffer for "
		       "pspoll template\n", sdata->name);
		return NULL;
	}
	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));
	if (!skb) {
		printk(KERN_DEBUG "%s: failed to allocate buffer for nullfunc "
		       "template\n", sdata->name);
		return NULL;
	}
	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);

2307 2308 2309 2310 2311 2312 2313 2314 2315 2316 2317 2318 2319 2320 2321 2322 2323 2324 2325 2326 2327 2328 2329 2330 2331 2332 2333 2334 2335 2336 2337 2338 2339 2340 2341 2342 2343 2344 2345 2346 2347 2348 2349 2350 2351 2352 2353 2354 2355 2356
struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw,
				       struct ieee80211_vif *vif,
				       const u8 *ssid, size_t ssid_len,
				       const u8 *ie, size_t ie_len)
{
	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) +
			    ie_ssid_len + ie_len);
	if (!skb) {
		printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
		       "request template\n", sdata->name);
		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);
	memset(hdr->addr1, 0xff, ETH_ALEN);
	memcpy(hdr->addr2, vif->addr, ETH_ALEN);
	memset(hdr->addr3, 0xff, ETH_ALEN);

	pos = skb_put(skb, ie_ssid_len);
	*pos++ = WLAN_EID_SSID;
	*pos++ = ssid_len;
	if (ssid)
		memcpy(pos, ssid, ssid_len);
	pos += ssid_len;

	if (ie) {
		pos = skb_put(skb, ie_len);
		memcpy(pos, ie, ie_len);
	}

	return skb;
}
EXPORT_SYMBOL(ieee80211_probereq_get);

2357
void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
2358
		       const void *frame, size_t frame_len,
2359
		       const struct ieee80211_tx_info *frame_txctl,
2360 2361 2362 2363
		       struct ieee80211_rts *rts)
{
	const struct ieee80211_hdr *hdr = frame;

2364 2365
	rts->frame_control =
	    cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
2366 2367
	rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
					       frame_txctl);
2368 2369 2370 2371 2372
	memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
	memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
}
EXPORT_SYMBOL(ieee80211_rts_get);

2373
void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
2374
			     const void *frame, size_t frame_len,
2375
			     const struct ieee80211_tx_info *frame_txctl,
2376 2377 2378 2379
			     struct ieee80211_cts *cts)
{
	const struct ieee80211_hdr *hdr = frame;

2380 2381
	cts->frame_control =
	    cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
2382 2383
	cts->duration = ieee80211_ctstoself_duration(hw, vif,
						     frame_len, frame_txctl);
2384 2385 2386 2387 2388
	memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
}
EXPORT_SYMBOL(ieee80211_ctstoself_get);

struct sk_buff *
2389
ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
2390
			  struct ieee80211_vif *vif)
2391 2392
{
	struct ieee80211_local *local = hw_to_local(hw);
2393
	struct sk_buff *skb = NULL;
2394
	struct sta_info *sta;
2395
	struct ieee80211_tx_data tx;
2396 2397
	struct ieee80211_sub_if_data *sdata;
	struct ieee80211_if_ap *bss = NULL;
2398
	struct beacon_data *beacon;
2399
	struct ieee80211_tx_info *info;
2400

2401
	sdata = vif_to_sdata(vif);
2402
	bss = &sdata->u.ap;
2403 2404 2405 2406

	rcu_read_lock();
	beacon = rcu_dereference(bss->beacon);

2407
	if (sdata->vif.type != NL80211_IFTYPE_AP || !beacon || !beacon->head)
2408
		goto out;
2409

2410
	if (bss->dtim_count != 0)
2411
		goto out; /* send buffered bc/mc only after DTIM beacon */
2412

2413 2414 2415
	while (1) {
		skb = skb_dequeue(&bss->ps_bc_buf);
		if (!skb)
2416
			goto out;
2417 2418 2419 2420 2421 2422 2423 2424 2425 2426 2427 2428
		local->total_ps_buffered--;

		if (!skb_queue_empty(&bss->ps_bc_buf) && skb->len >= 2) {
			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);
		}

J
Johannes Berg 已提交
2429
		if (!ieee80211_tx_prepare(sdata, &tx, skb))
2430 2431 2432
			break;
		dev_kfree_skb_any(skb);
	}
2433 2434 2435

	info = IEEE80211_SKB_CB(skb);

2436
	sta = tx.sta;
2437 2438
	tx.flags |= IEEE80211_TX_PS_BUFFERED;
	tx.channel = local->hw.conf.channel;
2439
	info->band = tx.channel->band;
2440

2441
	if (invoke_tx_handlers(&tx))
2442
		skb = NULL;
2443
 out:
2444
	rcu_read_unlock();
2445 2446 2447 2448

	return skb;
}
EXPORT_SYMBOL(ieee80211_get_buffered_bc);
J
Johannes Berg 已提交
2449

2450
void ieee80211_tx_skb(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
J
Johannes Berg 已提交
2451 2452 2453 2454 2455
{
	skb_set_mac_header(skb, 0);
	skb_set_network_header(skb, 0);
	skb_set_transport_header(skb, 0);

2456 2457 2458
	/* send all internal mgmt frames on VO */
	skb_set_queue_mapping(skb, 0);

2459 2460 2461 2462 2463 2464
	/*
	 * 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
2465
	ieee80211_xmit(sdata, skb);
2466
	local_bh_enable();
J
Johannes Berg 已提交
2467
}