tx.c 68.3 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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	struct ieee80211_local *local = tx->local;
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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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		if (!timer_pending(&local->sta_cleanup))
			mod_timer(&local->sta_cleanup,
				  round_jiffies(jiffies +
						STA_INFO_CLEANUP_INTERVAL));

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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) &&
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		 is_multicast_ether_addr(hdr->addr1) &&
		 ieee80211_is_robust_mgmt_frame(hdr) &&
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		 (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) {
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		bool skip_hw = false;

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		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;
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			else
				skip_hw = (tx->key->conf.flags &
					   IEEE80211_KEY_FLAG_SW_MGMT) &&
					ieee80211_is_mgmt(hdr->frame_control);
563
			break;
564 565 566 567
		case ALG_AES_CMAC:
			if (!ieee80211_is_mgmt(hdr->frame_control))
				tx->key = NULL;
			break;
568
		}
569

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		if (!skip_hw && tx->key &&
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		    tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
572
			info->control.hw_key = &tx->key->conf;
573 574
	}

575
	return TX_CONTINUE;
576 577
}

578 579 580 581 582
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);

583
	if (tx->sta && tx->sta->uploaded)
584 585 586 587 588
		info->control.sta = &tx->sta->sta;

	return TX_CONTINUE;
}

589
static ieee80211_tx_result debug_noinline
590
ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
591
{
592
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
593 594 595
	struct ieee80211_hdr *hdr = (void *)tx->skb->data;
	struct ieee80211_supported_band *sband;
	struct ieee80211_rate *rate;
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	int i;
	u32 len;
598 599
	bool inval = false, rts = false, short_preamble = false;
	struct ieee80211_tx_rate_control txrc;
600
	u32 sta_flags;
601

602
	memset(&txrc, 0, sizeof(txrc));
603

604
	sband = tx->local->hw.wiphy->bands[tx->channel->band];
605

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	len = min_t(u32, tx->skb->len + FCS_LEN,
607
			 tx->local->hw.wiphy->frag_threshold);
608 609 610 611 612 613 614

	/* 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;
615 616 617 618 619
	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;
620
	txrc.ap = tx->sdata->vif.type == NL80211_IFTYPE_AP;
621 622

	/* set up RTS protection if desired */
623
	if (len > tx->local->hw.wiphy->rts_threshold) {
624
		txrc.rts = rts = true;
625 626
	}

627 628 629 630 631 632 633 634 635 636
	/*
	 * 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;
637

638 639 640 641 642 643
	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.
	 */
644
	if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) &&
645 646 647 648 649
		 (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",
650
		 tx->sdata->name, hdr->addr1,
651 652
		 tx->channel->band ? 5 : 2))
		return TX_DROP;
653

654 655 656 657
	/*
	 * If we're associated with the sta at this point we know we can at
	 * least send the frame at the lowest bit rate.
	 */
658 659 660 661 662 663 664
	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];
665

666
	if (tx->sta)
667
		tx->sta->last_tx_rate = txrc.reported_rate;
668

669 670
	if (unlikely(!info->control.rates[0].count))
		info->control.rates[0].count = 1;
671

672 673 674 675
	if (WARN_ON_ONCE((info->control.rates[0].count > 1) &&
			 (info->flags & IEEE80211_TX_CTL_NO_ACK)))
		info->control.rates[0].count = 1;

676 677 678 679 680
	if (is_multicast_ether_addr(hdr->addr1)) {
		/*
		 * XXX: verify the rate is in the basic rateset
		 */
		return TX_CONTINUE;
681 682
	}

683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707
	/*
	 * 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;
708 709
	}

710 711 712 713 714 715 716 717 718 719 720 721 722 723
	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;
		}
724

725 726 727 728 729 730 731 732
		/*
		 * 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;
		}
733

734 735 736 737
		/* set up RTS protection if desired */
		if (rts)
			info->control.rates[i].flags |=
				IEEE80211_TX_RC_USE_RTS_CTS;
738

739
		/* RC is busted */
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		if (WARN_ON_ONCE(info->control.rates[i].idx >=
				 sband->n_bitrates)) {
742 743
			info->control.rates[i].idx = -1;
			continue;
744
		}
745

746 747 748 749 750 751 752 753 754 755 756 757 758
		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;
759 760
	}

761 762 763
	return TX_CONTINUE;
}

764 765 766 767 768 769 770 771 772
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;

773 774 775 776 777
	/*
	 * 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.
	 */
778
	if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR))
779 780
		return TX_CONTINUE;

781 782 783 784 785 786
	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.
	 */
792
	if (!ieee80211_is_data_qos(hdr->frame_control)) {
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		/* driver should assign sequence number */
794
		info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
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795 796 797
		/* 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;
798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822
		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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823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867
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;
}

868
static ieee80211_tx_result debug_noinline
869 870
ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
{
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871 872 873
	struct sk_buff *skb = tx->skb;
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
	struct ieee80211_hdr *hdr = (void *)skb->data;
874
	int frag_threshold = tx->local->hw.wiphy->frag_threshold;
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	int hdrlen;
	int fragnum;
877 878 879 880

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

881 882
	/*
	 * 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
884
	 * caution taken here as fragmented ampdu may cause Tx stop.
885
	 */
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886
	if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
887 888
		return TX_DROP;

889
	hdrlen = ieee80211_hdrlen(hdr->frame_control);
890

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891
	/* internal error, why is TX_FRAGMENTED set? */
892
	if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))
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893
		return TX_DROP;
894

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895 896 897 898 899 900 901 902 903 904
	/*
	 * 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;
905

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906 907 908 909 910
	/* update duration/seq/flags of fragments */
	fragnum = 0;
	do {
		int next_len;
		const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
911

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912 913
		hdr = (void *)skb->data;
		info = IEEE80211_SKB_CB(skb);
914

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915 916 917
		if (skb->next) {
			hdr->frame_control |= morefrags;
			next_len = skb->next->len;
918 919 920 921 922 923 924 925 926 927
			/*
			 * 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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928 929 930
		} else {
			hdr->frame_control &= ~morefrags;
			next_len = 0;
931
		}
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932 933 934 935
		hdr->duration_id = ieee80211_duration(tx, 0, next_len);
		hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG);
		fragnum++;
	} while ((skb = skb->next));
936

937
	return TX_CONTINUE;
938 939
}

940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956
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;
}

957
static ieee80211_tx_result debug_noinline
958 959 960 961 962 963 964 965 966 967 968 969
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);
970 971
	case ALG_AES_CMAC:
		return ieee80211_crypto_aes_cmac_encrypt(tx);
972 973 974 975 976 977 978
	}

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

979
static ieee80211_tx_result debug_noinline
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980 981
ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
{
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982 983 984 985
	struct sk_buff *skb = tx->skb;
	struct ieee80211_hdr *hdr;
	int next_len;
	bool group_addr;
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986

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987 988
	do {
		hdr = (void *) skb->data;
989 990
		if (unlikely(ieee80211_is_pspoll(hdr->frame_control)))
			break; /* must not overwrite AID */
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991 992
		next_len = skb->next ? skb->next->len : 0;
		group_addr = is_multicast_ether_addr(hdr->addr1);
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993

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994 995 996
		hdr->duration_id =
			ieee80211_duration(tx, group_addr, next_len);
	} while ((skb = skb->next));
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997 998 999 1000

	return TX_CONTINUE;
}

1001 1002 1003 1004 1005 1006
/* actual transmit path */

/*
 * deal with packet injection down monitor interface
 * with Radiotap Header -- only called for monitor mode interface
 */
1007 1008
static bool __ieee80211_parse_tx_radiotap(struct ieee80211_tx_data *tx,
					  struct sk_buff *skb)
1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020
{
	/*
	 * 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;
1021
	struct ieee80211_supported_band *sband;
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1022
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
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1023 1024
	int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len,
						   NULL);
1025

1026
	sband = tx->local->hw.wiphy->bands[tx->channel->band];
1027

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1028
	info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1029
	tx->flags &= ~IEEE80211_TX_FRAGMENTED;
1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059

	/*
	 * 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
				 */
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1060
				if (skb->len < (iterator._max_length + FCS_LEN))
1061
					return false;
1062 1063 1064

				skb_trim(skb, skb->len - FCS_LEN);
			}
1065
			if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
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				info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT;
1067
			if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
1068
				tx->flags |= IEEE80211_TX_FRAGMENTED;
1069 1070
			break;

1071 1072 1073 1074 1075 1076
		/*
		 * Please update the file
		 * Documentation/networking/mac80211-injection.txt
		 * when parsing new fields here.
		 */

1077 1078 1079 1080 1081 1082
		default:
			break;
		}
	}

	if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
1083
		return false;
1084 1085 1086

	/*
	 * remove the radiotap header
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1087
	 * iterator->_max_length was sanity-checked against
1088 1089
	 * skb->len by iterator init
	 */
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	skb_pull(skb, iterator._max_length);
1091

1092
	return true;
1093 1094
}

1095 1096 1097
/*
 * initialises @tx
 */
1098
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)
1102
{
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1103
	struct ieee80211_local *local = sdata->local;
1104
	struct ieee80211_hdr *hdr;
1105
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
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	int hdrlen, tid;
	u8 *qc, *state;
1108
	bool queued = false;
1109 1110 1111 1112

	memset(tx, 0, sizeof(*tx));
	tx->skb = skb;
	tx->local = local;
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	tx->sdata = sdata;
1114
	tx->channel = local->hw.conf.channel;
1115
	/*
1116 1117
	 * Set this flag (used below to indicate "automatic fragmentation"),
	 * it will be cleared/left by radiotap as desired.
1118
	 */
1119
	tx->flags |= IEEE80211_TX_FRAGMENTED;
1120 1121

	/* process and remove the injection radiotap header */
1122
	if (unlikely(info->flags & IEEE80211_TX_INTFL_HAS_RADIOTAP)) {
1123
		if (!__ieee80211_parse_tx_radiotap(tx, skb))
1124
			return TX_DROP;
1125

1126
		/*
1127 1128 1129
		 * __ieee80211_parse_tx_radiotap has now removed
		 * the radiotap header that was present and pre-filled
		 * 'tx' with tx control information.
1130
		 */
1131
		info->flags &= ~IEEE80211_TX_INTFL_HAS_RADIOTAP;
1132 1133
	}

1134 1135 1136 1137 1138 1139 1140
	/*
	 * 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;

1141 1142
	hdr = (struct ieee80211_hdr *) skb->data;

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

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

S
Sujith 已提交
1157 1158 1159
		qc = ieee80211_get_qos_ctl(hdr);
		tid = *qc & IEEE80211_QOS_CTL_TID_MASK;

1160
		spin_lock(&tx->sta->lock);
1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174
		/*
		 * 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
1175
		state = &tx->sta->ampdu_mlme.tid_state_tx[tid];
1176
		if (*state == HT_AGG_STATE_OPERATIONAL) {
S
Sujith 已提交
1177
			info->flags |= IEEE80211_TX_CTL_AMPDU;
1178 1179 1180
		} else if (*state != HT_AGG_STATE_IDLE) {
			/* in progress */
			queued = true;
1181
			info->control.vif = &sdata->vif;
1182 1183 1184
			info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
			__skb_queue_tail(&tid_tx->pending, skb);
		}
1185
		spin_unlock(&tx->sta->lock);
1186 1187 1188

		if (unlikely(queued))
			return TX_QUEUED;
S
Sujith 已提交
1189 1190
	}

1191
	if (is_multicast_ether_addr(hdr->addr1)) {
1192
		tx->flags &= ~IEEE80211_TX_UNICAST;
1193
		info->flags |= IEEE80211_TX_CTL_NO_ACK;
1194
	} else {
1195
		tx->flags |= IEEE80211_TX_UNICAST;
1196 1197 1198 1199
		if (unlikely(local->wifi_wme_noack_test))
			info->flags |= IEEE80211_TX_CTL_NO_ACK;
		else
			info->flags &= ~IEEE80211_TX_CTL_NO_ACK;
1200
	}
1201

1202 1203
	if (tx->flags & IEEE80211_TX_FRAGMENTED) {
		if ((tx->flags & IEEE80211_TX_UNICAST) &&
1204
		    skb->len + FCS_LEN > local->hw.wiphy->frag_threshold &&
1205
		    !(info->flags & IEEE80211_TX_CTL_AMPDU))
1206
			tx->flags |= IEEE80211_TX_FRAGMENTED;
1207
		else
1208
			tx->flags &= ~IEEE80211_TX_FRAGMENTED;
1209 1210
	}

1211
	if (!tx->sta)
1212
		info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1213
	else if (test_and_clear_sta_flags(tx->sta, WLAN_STA_CLEAR_PS_FILT))
1214
		info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1215

1216
	hdrlen = ieee80211_hdrlen(hdr->frame_control);
1217 1218 1219 1220
	if (skb->len > hdrlen + sizeof(rfc1042_header) + 2) {
		u8 *pos = &skb->data[hdrlen + sizeof(rfc1042_header)];
		tx->ethertype = (pos[0] << 8) | pos[1];
	}
1221
	info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
1222

1223
	return TX_CONTINUE;
1224 1225
}

J
Johannes Berg 已提交
1226
static int __ieee80211_tx(struct ieee80211_local *local,
1227
			  struct sk_buff **skbp,
J
Johannes Berg 已提交
1228 1229
			  struct sta_info *sta,
			  bool txpending)
1230
{
1231
	struct sk_buff *skb = *skbp, *next;
1232
	struct ieee80211_tx_info *info;
1233
	struct ieee80211_sub_if_data *sdata;
J
Johannes Berg 已提交
1234
	unsigned long flags;
1235
	int ret, len;
J
Johannes Berg 已提交
1236
	bool fragm = false;
1237

J
Johannes Berg 已提交
1238
	while (skb) {
J
Johannes Berg 已提交
1239 1240 1241 1242 1243 1244 1245 1246 1247 1248
		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;
1249

1250 1251 1252
		info = IEEE80211_SKB_CB(skb);

		if (fragm)
1253
			info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT |
1254
					 IEEE80211_TX_CTL_FIRST_FRAGMENT);
1255

J
Johannes Berg 已提交
1256
		next = skb->next;
1257
		len = skb->len;
1258

J
Johannes Berg 已提交
1259 1260 1261
		if (next)
			info->flags |= IEEE80211_TX_CTL_MORE_FRAMES;

1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276
		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;
		}

1277
		ret = drv_tx(local, skb);
1278 1279 1280 1281
		if (WARN_ON(ret != NETDEV_TX_OK && skb->len != len)) {
			dev_kfree_skb(skb);
			ret = NETDEV_TX_OK;
		}
1282 1283
		if (ret != NETDEV_TX_OK) {
			info->control.vif = &sdata->vif;
J
Johannes Berg 已提交
1284
			return IEEE80211_TX_AGAIN;
1285 1286
		}

1287
		*skbp = skb = next;
J
Johannes Berg 已提交
1288 1289
		ieee80211_led_tx(local, 1);
		fragm = true;
1290
	}
J
Johannes Berg 已提交
1291

1292 1293 1294
	return IEEE80211_TX_OK;
}

1295 1296 1297 1298 1299 1300 1301
/*
 * 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;
1302
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1303 1304
	ieee80211_tx_result res = TX_DROP;

1305 1306 1307 1308 1309 1310 1311
#define CALL_TXH(txh) \
	do {				\
		res = txh(tx);		\
		if (res != TX_CONTINUE)	\
			goto txh_done;	\
	} while (0)

1312
	CALL_TXH(ieee80211_tx_h_dynamic_ps);
1313 1314 1315
	CALL_TXH(ieee80211_tx_h_check_assoc);
	CALL_TXH(ieee80211_tx_h_ps_buf);
	CALL_TXH(ieee80211_tx_h_select_key);
1316
	CALL_TXH(ieee80211_tx_h_sta);
1317 1318
	if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
		CALL_TXH(ieee80211_tx_h_rate_ctrl);
1319 1320 1321 1322 1323

	if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION))
		goto txh_done;

	CALL_TXH(ieee80211_tx_h_michael_mic_add);
1324 1325
	CALL_TXH(ieee80211_tx_h_sequence);
	CALL_TXH(ieee80211_tx_h_fragment);
1326
	/* handlers after fragment must be aware of tx info fragmentation! */
1327 1328 1329
	CALL_TXH(ieee80211_tx_h_stats);
	CALL_TXH(ieee80211_tx_h_encrypt);
	CALL_TXH(ieee80211_tx_h_calculate_duration);
1330
#undef CALL_TXH
1331

1332
 txh_done:
1333
	if (unlikely(res == TX_DROP)) {
1334
		I802_DEBUG_INC(tx->local->tx_handlers_drop);
J
Johannes Berg 已提交
1335 1336 1337 1338 1339 1340 1341
		while (skb) {
			struct sk_buff *next;

			next = skb->next;
			dev_kfree_skb(skb);
			skb = next;
		}
1342 1343
		return -1;
	} else if (unlikely(res == TX_QUEUED)) {
1344
		I802_DEBUG_INC(tx->local->tx_handlers_queued);
1345 1346 1347 1348 1349 1350
		return -1;
	}

	return 0;
}

J
Johannes Berg 已提交
1351 1352
static void ieee80211_tx(struct ieee80211_sub_if_data *sdata,
			 struct sk_buff *skb, bool txpending)
1353
{
J
Johannes Berg 已提交
1354
	struct ieee80211_local *local = sdata->local;
1355
	struct ieee80211_tx_data tx;
1356
	ieee80211_tx_result res_prepare;
1357
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1358 1359 1360
	struct sk_buff *next;
	unsigned long flags;
	int ret, retries;
1361
	u16 queue;
1362

1363 1364
	queue = skb_get_queue_mapping(skb);

1365 1366
	if (unlikely(skb->len < 10)) {
		dev_kfree_skb(skb);
1367
		return;
1368 1369
	}

1370 1371
	rcu_read_lock();

1372
	/* initialises tx */
J
Johannes Berg 已提交
1373
	res_prepare = ieee80211_tx_prepare(sdata, &tx, skb);
1374

1375
	if (unlikely(res_prepare == TX_DROP)) {
1376
		dev_kfree_skb(skb);
1377
		rcu_read_unlock();
1378 1379 1380 1381
		return;
	} else if (unlikely(res_prepare == TX_QUEUED)) {
		rcu_read_unlock();
		return;
1382 1383
	}

1384
	tx.channel = local->hw.conf.channel;
1385
	info->band = tx.channel->band;
1386

1387 1388
	if (invoke_tx_handlers(&tx))
		goto out;
1389

1390 1391
	retries = 0;
 retry:
J
Johannes Berg 已提交
1392
	ret = __ieee80211_tx(local, &tx.skb, tx.sta, txpending);
1393 1394 1395 1396
	switch (ret) {
	case IEEE80211_TX_OK:
		break;
	case IEEE80211_TX_AGAIN:
1397 1398 1399 1400 1401
		/*
		 * 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.
		 */
1402 1403 1404 1405 1406
		if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
			goto drop;
		/* fall through */
	case IEEE80211_TX_PENDING:
		skb = tx.skb;
1407

1408
		spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1409

J
Johannes Berg 已提交
1410 1411 1412 1413 1414 1415
		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
			 */
1416 1417 1418
			do {
				next = skb->next;
				skb->next = NULL;
1419
				if (unlikely(txpending))
J
Johannes Berg 已提交
1420 1421
					__skb_queue_head(&local->pending[queue],
							 skb);
1422
				else
J
Johannes Berg 已提交
1423 1424
					__skb_queue_tail(&local->pending[queue],
							 skb);
1425 1426 1427 1428 1429
			} while ((skb = next));

			spin_unlock_irqrestore(&local->queue_stop_reason_lock,
					       flags);
		} else {
J
Johannes Berg 已提交
1430 1431 1432 1433
			/*
			 * otherwise retry, but this is a race condition or
			 * a driver bug (which we warn about if it persists)
			 */
1434 1435 1436 1437
			spin_unlock_irqrestore(&local->queue_stop_reason_lock,
					       flags);

			retries++;
J
Johannes Berg 已提交
1438
			if (WARN(retries > 10, "tx refused but queue active\n"))
1439
				goto drop;
1440 1441 1442
			goto retry;
		}
	}
1443
 out:
1444
	rcu_read_unlock();
1445
	return;
1446 1447

 drop:
1448
	rcu_read_unlock();
J
Johannes Berg 已提交
1449 1450 1451 1452 1453 1454 1455

	skb = tx.skb;
	while (skb) {
		next = skb->next;
		dev_kfree_skb(skb);
		skb = next;
	}
1456 1457 1458 1459
}

/* device xmit handlers */

1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498
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
1499 1500
static void ieee80211_xmit(struct ieee80211_sub_if_data *sdata,
			   struct sk_buff *skb)
1501
{
J
Johannes Berg 已提交
1502
	struct ieee80211_local *local = sdata->local;
1503
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1504
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
J
Johannes Berg 已提交
1505
	struct ieee80211_sub_if_data *tmp_sdata;
1506
	int headroom;
1507
	bool may_encrypt;
1508

1509 1510
	rcu_read_lock();

1511
	if (unlikely(sdata->vif.type == NL80211_IFTYPE_MONITOR)) {
1512 1513 1514
		int hdrlen;
		u16 len_rthdr;

1515 1516
		info->flags |= IEEE80211_TX_CTL_INJECTED |
			       IEEE80211_TX_INTFL_HAS_RADIOTAP;
1517 1518

		len_rthdr = ieee80211_get_radiotap_len(skb->data);
1519
		hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533
		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
1534
			list_for_each_entry_rcu(tmp_sdata, &local->interfaces,
1535
						list) {
1536
				if (!ieee80211_sdata_running(tmp_sdata))
1537
					continue;
J
Johannes Berg 已提交
1538
				if (tmp_sdata->vif.type != NL80211_IFTYPE_AP)
1539
					continue;
1540
				if (compare_ether_addr(tmp_sdata->vif.addr,
1541
						       hdr->addr2) == 0) {
J
Johannes Berg 已提交
1542
					sdata = tmp_sdata;
1543 1544 1545 1546
					break;
				}
			}
		}
1547 1548
	}

J
Johannes Berg 已提交
1549
	may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT);
1550

J
Johannes Berg 已提交
1551
	headroom = local->tx_headroom;
1552 1553 1554 1555 1556
	if (may_encrypt)
		headroom += IEEE80211_ENCRYPT_HEADROOM;
	headroom -= skb_headroom(skb);
	headroom = max_t(int, 0, headroom);

J
Johannes Berg 已提交
1557
	if (ieee80211_skb_resize(local, skb, headroom, may_encrypt)) {
1558
		dev_kfree_skb(skb);
1559
		rcu_read_unlock();
J
Johannes Berg 已提交
1560
		return;
1561 1562
	}

1563
	info->control.vif = &sdata->vif;
1564

1565 1566 1567 1568 1569
	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 */
1570
				rcu_read_unlock();
1571 1572 1573
				return;
			}

1574
	ieee80211_set_qos_hdr(local, skb);
J
Johannes Berg 已提交
1575
	ieee80211_tx(sdata, skb, false);
1576
	rcu_read_unlock();
1577 1578
}

1579 1580
netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
					 struct net_device *dev)
1581 1582
{
	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1583
	struct ieee80211_channel *chan = local->hw.conf.channel;
1584 1585
	struct ieee80211_radiotap_header *prthdr =
		(struct ieee80211_radiotap_header *)skb->data;
J
Johannes Berg 已提交
1586
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1587
	u16 len_rthdr;
1588

1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608
	/*
	 * 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;

1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622
	/* 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 */
1623 1624 1625 1626 1627 1628 1629

	/*
	 * 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
	 */
1630
	skb_set_mac_header(skb, len_rthdr);
1631
	/*
1632 1633
	 * 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
1634
	 */
1635 1636
	skb_set_network_header(skb, len_rthdr);
	skb_set_transport_header(skb, len_rthdr);
1637

J
Johannes Berg 已提交
1638 1639
	memset(info, 0, sizeof(*info));

1640 1641
	info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;

J
Johannes Berg 已提交
1642 1643
	/* pass the radiotap header up to xmit */
	ieee80211_xmit(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1644
	return NETDEV_TX_OK;
1645 1646 1647 1648

fail:
	dev_kfree_skb(skb);
	return NETDEV_TX_OK; /* meaning, we dealt with the skb */
1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665
}

/**
 * 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).
 */
1666 1667
netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
				    struct net_device *dev)
1668
{
1669 1670
	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
	struct ieee80211_local *local = sdata->local;
J
Johannes Berg 已提交
1671
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1672
	int ret = NETDEV_TX_BUSY, head_need;
1673 1674
	u16 ethertype, hdrlen,  meshhdrlen = 0;
	__le16 fc;
1675
	struct ieee80211_hdr hdr;
1676
	struct ieee80211s_hdr mesh_hdr;
1677 1678
	const u8 *encaps_data;
	int encaps_len, skip_header_bytes;
1679
	int nh_pos, h_pos;
1680
	struct sta_info *sta = NULL;
1681
	u32 sta_flags = 0;
1682 1683

	if (unlikely(skb->len < ETH_HLEN)) {
1684
		ret = NETDEV_TX_OK;
1685 1686 1687 1688 1689 1690 1691 1692 1693
		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];
1694
	fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
1695

1696
	switch (sdata->vif.type) {
1697
	case NL80211_IFTYPE_AP_VLAN:
1698
		rcu_read_lock();
1699
		sta = rcu_dereference(sdata->u.vlan.sta);
1700 1701 1702 1703
		if (sta) {
			fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
			/* RA TA DA SA */
			memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN);
1704
			memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1705 1706 1707 1708 1709 1710 1711 1712 1713 1714
			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:
1715
		fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
1716 1717
		/* DA BSSID SA */
		memcpy(hdr.addr1, skb->data, ETH_ALEN);
1718
		memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1719 1720
		memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
		hdrlen = 24;
1721
		break;
1722
	case NL80211_IFTYPE_WDS:
1723
		fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1724 1725
		/* RA TA DA SA */
		memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
1726
		memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1727 1728 1729
		memcpy(hdr.addr3, skb->data, ETH_ALEN);
		memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
		hdrlen = 30;
1730
		break;
1731
#ifdef CONFIG_MAC80211_MESH
1732
	case NL80211_IFTYPE_MESH_POINT:
1733
		if (!sdata->u.mesh.mshcfg.dot11MeshTTL) {
1734
			/* Do not send frames with mesh_ttl == 0 */
1735
			sdata->u.mesh.mshstats.dropped_frames_ttl++;
1736
			ret = NETDEV_TX_OK;
1737
			goto fail;
1738
		}
1739

1740 1741
		if (compare_ether_addr(sdata->vif.addr,
				       skb->data + ETH_ALEN) == 0) {
1742 1743 1744 1745
			hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
					skb->data, skb->data + ETH_ALEN);
			meshhdrlen = ieee80211_new_mesh_header(&mesh_hdr,
					sdata, NULL, NULL, NULL);
1746 1747 1748
		} else {
			/* packet from other interface */
			struct mesh_path *mppath;
1749
			int is_mesh_mcast = 1;
1750
			const u8 *mesh_da;
1751

1752
			rcu_read_lock();
1753
			if (is_multicast_ether_addr(skb->data))
1754 1755
				/* DA TA mSA AE:SA */
				mesh_da = skb->data;
1756
			else {
1757 1758 1759
				static const u8 bcast[ETH_ALEN] =
					{ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };

1760
				mppath = mpp_path_lookup(skb->data, sdata);
1761 1762 1763 1764
				if (mppath) {
					/* RA TA mDA mSA AE:DA SA */
					mesh_da = mppath->mpp;
					is_mesh_mcast = 0;
1765
				} else {
1766
					/* DA TA mSA AE:SA */
1767 1768
					mesh_da = bcast;
				}
1769
			}
1770
			hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
1771
					mesh_da, sdata->vif.addr);
1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786
			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);
1787 1788

		}
1789 1790
		break;
#endif
1791
	case NL80211_IFTYPE_STATION:
1792
		memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
1793
		if (sdata->u.mgd.use_4addr && ethertype != ETH_P_PAE) {
1794 1795
			fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
			/* RA TA DA SA */
1796
			memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1797 1798 1799 1800 1801 1802 1803 1804 1805 1806
			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;
		}
1807
		break;
1808
	case NL80211_IFTYPE_ADHOC:
1809 1810 1811
		/* DA SA BSSID */
		memcpy(hdr.addr1, skb->data, ETH_ALEN);
		memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1812
		memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN);
1813
		hdrlen = 24;
1814 1815
		break;
	default:
1816
		ret = NETDEV_TX_OK;
1817 1818 1819
		goto fail;
	}

1820 1821 1822 1823 1824 1825
	/*
	 * 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)) {
1826
		rcu_read_lock();
1827 1828
		sta = sta_info_get(sdata, hdr.addr1);
		if (sta)
1829
			sta_flags = get_sta_flags(sta);
1830
		rcu_read_unlock();
1831 1832
	}

1833
	/* receiver and we are QoS enabled, use a QoS type frame */
1834
	if ((sta_flags & WLAN_STA_WME) && local->hw.queues >= 4) {
1835
		fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
1836 1837 1838 1839
		hdrlen += 2;
	}

	/*
1840 1841
	 * Drop unicast frames to unauthorised stations unless they are
	 * EAPOL frames from the local station.
1842
	 */
1843 1844
	if (!ieee80211_vif_is_mesh(&sdata->vif) &&
		unlikely(!is_multicast_ether_addr(hdr.addr1) &&
1845 1846
		      !(sta_flags & WLAN_STA_AUTHORIZED) &&
		      !(ethertype == ETH_P_PAE &&
1847
		       compare_ether_addr(sdata->vif.addr,
1848 1849 1850
					  skb->data + ETH_ALEN) == 0))) {
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
		if (net_ratelimit())
1851
			printk(KERN_DEBUG "%s: dropped frame to %pM"
1852
			       " (unauthorized port)\n", dev->name,
1853
			       hdr.addr1);
1854 1855 1856 1857
#endif

		I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);

1858
		ret = NETDEV_TX_OK;
1859 1860 1861
		goto fail;
	}

1862
	hdr.frame_control = fc;
1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883
	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;

1884
	head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
1885

1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896
	/*
	 * 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.
	 */
1897

1898
	if (head_need > 0 || skb_cloned(skb)) {
1899 1900 1901 1902
		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))
1903 1904 1905 1906 1907 1908 1909 1910
			goto fail;
	}

	if (encaps_data) {
		memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
		nh_pos += encaps_len;
		h_pos += encaps_len;
	}
1911

1912 1913 1914 1915 1916 1917
	if (meshhdrlen > 0) {
		memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
		nh_pos += meshhdrlen;
		h_pos += meshhdrlen;
	}

1918
	if (ieee80211_is_data_qos(fc)) {
1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930
		__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);

1931 1932 1933
	nh_pos += hdrlen;
	h_pos += hdrlen;

1934 1935
	dev->stats.tx_packets++;
	dev->stats.tx_bytes += skb->len;
1936 1937 1938 1939 1940 1941 1942 1943

	/* 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
1944 1945
	memset(info, 0, sizeof(*info));

1946
	dev->trans_start = jiffies;
J
Johannes Berg 已提交
1947
	ieee80211_xmit(sdata, skb);
1948

1949
	return NETDEV_TX_OK;
1950 1951

 fail:
1952
	if (ret == NETDEV_TX_OK)
1953 1954 1955 1956 1957 1958
		dev_kfree_skb(skb);

	return ret;
}


1959 1960 1961 1962
/*
 * ieee80211_clear_tx_pending may not be called in a context where
 * it is possible that it packets could come in again.
 */
1963 1964
void ieee80211_clear_tx_pending(struct ieee80211_local *local)
{
J
Johannes Berg 已提交
1965
	int i;
1966

1967 1968
	for (i = 0; i < local->hw.queues; i++)
		skb_queue_purge(&local->pending[i]);
1969 1970
}

1971 1972 1973 1974 1975 1976 1977 1978 1979 1980
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;

1981
	sdata = vif_to_sdata(info->control.vif);
1982 1983

	if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) {
1984
		ieee80211_tx(sdata, skb, true);
1985 1986
	} else {
		hdr = (struct ieee80211_hdr *)skb->data;
1987
		sta = sta_info_get(sdata, hdr->addr1);
1988

J
Johannes Berg 已提交
1989
		ret = __ieee80211_tx(local, &skb, sta, true);
1990 1991 1992 1993 1994 1995 1996
		if (ret != IEEE80211_TX_OK)
			result = false;
	}

	return result;
}

1997
/*
J
Johannes Berg 已提交
1998
 * Transmit all pending packets. Called from tasklet.
1999
 */
2000 2001 2002
void ieee80211_tx_pending(unsigned long data)
{
	struct ieee80211_local *local = (struct ieee80211_local *)data;
2003
	struct ieee80211_sub_if_data *sdata;
2004
	unsigned long flags;
2005
	int i;
J
Johannes Berg 已提交
2006
	bool txok;
2007

2008
	rcu_read_lock();
2009

J
Johannes Berg 已提交
2010
	spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
2011 2012 2013 2014 2015
	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
2016
		if (local->queue_stop_reasons[i] ||
2017
		    skb_queue_empty(&local->pending[i]))
2018
			continue;
2019

2020
		while (!skb_queue_empty(&local->pending[i])) {
J
Johannes Berg 已提交
2021
			struct sk_buff *skb = __skb_dequeue(&local->pending[i]);
2022 2023
			struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);

2024 2025 2026 2027 2028
			if (WARN_ON(!info->control.vif)) {
				kfree_skb(skb);
				continue;
			}

J
Johannes Berg 已提交
2029 2030 2031 2032 2033 2034 2035 2036 2037
			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)
2038
				break;
2039
		}
2040 2041 2042 2043 2044

		if (skb_queue_empty(&local->pending[i]))
			list_for_each_entry_rcu(sdata, &local->interfaces, list)
				netif_tx_wake_queue(
					netdev_get_tx_queue(sdata->dev, i));
2045
	}
J
Johannes Berg 已提交
2046
	spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
2047

2048
	rcu_read_unlock();
2049 2050 2051 2052
}

/* functions for drivers to get certain frames */

R
Rami Rosen 已提交
2053
static void ieee80211_beacon_add_tim(struct ieee80211_if_ap *bss,
2054 2055
				     struct sk_buff *skb,
				     struct beacon_data *beacon)
2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069
{
	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)
2070
		bss->dtim_count = beacon->dtim_period - 1;
2071 2072 2073 2074 2075 2076 2077
	else
		bss->dtim_count--;

	tim = pos = (u8 *) skb_put(skb, 6);
	*pos++ = WLAN_EID_TIM;
	*pos++ = 4;
	*pos++ = bss->dtim_count;
2078
	*pos++ = beacon->dtim_period;
2079 2080 2081 2082 2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108 2109 2110 2111 2112 2113 2114

	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 */
	}
}

2115 2116 2117
struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
					 struct ieee80211_vif *vif,
					 u16 *tim_offset, u16 *tim_length)
2118 2119
{
	struct ieee80211_local *local = hw_to_local(hw);
2120
	struct sk_buff *skb = NULL;
2121
	struct ieee80211_tx_info *info;
2122 2123
	struct ieee80211_sub_if_data *sdata = NULL;
	struct ieee80211_if_ap *ap = NULL;
2124
	struct beacon_data *beacon;
2125
	struct ieee80211_supported_band *sband;
2126
	enum ieee80211_band band = local->hw.conf.channel->band;
2127
	struct ieee80211_tx_rate_control txrc;
2128

2129
	sband = local->hw.wiphy->bands[band];
2130 2131

	rcu_read_lock();
2132

2133
	sdata = vif_to_sdata(vif);
2134

2135 2136 2137 2138 2139
	if (tim_offset)
		*tim_offset = 0;
	if (tim_length)
		*tim_length = 0;

2140
	if (sdata->vif.type == NL80211_IFTYPE_AP) {
2141 2142
		ap = &sdata->u.ap;
		beacon = rcu_dereference(ap->beacon);
J
Johannes Berg 已提交
2143 2144 2145 2146 2147 2148 2149 2150 2151 2152
		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;
2153

J
Johannes Berg 已提交
2154 2155 2156
			skb_reserve(skb, local->tx_headroom);
			memcpy(skb_put(skb, beacon->head_len), beacon->head,
			       beacon->head_len);
2157

2158 2159 2160 2161 2162 2163 2164 2165
			/*
			 * 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
2166
				ieee80211_beacon_add_tim(ap, skb, beacon);
2167 2168 2169 2170
			} else {
				unsigned long flags;

				spin_lock_irqsave(&local->sta_lock, flags);
R
Rami Rosen 已提交
2171
				ieee80211_beacon_add_tim(ap, skb, beacon);
2172 2173
				spin_unlock_irqrestore(&local->sta_lock, flags);
			}
2174

2175 2176 2177 2178 2179
			if (tim_offset)
				*tim_offset = beacon->head_len;
			if (tim_length)
				*tim_length = skb->len - beacon->head_len;

J
Johannes Berg 已提交
2180 2181 2182
			if (beacon->tail)
				memcpy(skb_put(skb, beacon->tail_len),
				       beacon->tail, beacon->tail_len);
2183 2184
		} else
			goto out;
2185
	} else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
2186
		struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
2187
		struct ieee80211_hdr *hdr;
2188
		struct sk_buff *presp = rcu_dereference(ifibss->presp);
2189

2190
		if (!presp)
2191 2192
			goto out;

2193
		skb = skb_copy(presp, GFP_ATOMIC);
2194 2195 2196 2197
		if (!skb)
			goto out;

		hdr = (struct ieee80211_hdr *) skb->data;
2198 2199
		hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
						 IEEE80211_STYPE_BEACON);
J
Johannes Berg 已提交
2200
	} else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2201 2202 2203
		struct ieee80211_mgmt *mgmt;
		u8 *pos;

J
Johannes Berg 已提交
2204 2205 2206 2207 2208 2209 2210 2211 2212
		/* 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));
2213 2214
		mgmt->frame_control =
		    cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_BEACON);
J
Johannes Berg 已提交
2215
		memset(mgmt->da, 0xff, ETH_ALEN);
2216 2217
		memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
		memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
J
Johannes Berg 已提交
2218
		mgmt->u.beacon.beacon_int =
2219
			cpu_to_le16(sdata->vif.bss_conf.beacon_int);
J
Johannes Berg 已提交
2220 2221 2222 2223 2224 2225
		mgmt->u.beacon.capab_info = 0x0; /* 0x0 for MPs */

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

2226
		mesh_mgmt_ies_add(skb, sdata);
2227 2228
	} else {
		WARN_ON(1);
2229
		goto out;
2230 2231
	}

2232 2233
	info = IEEE80211_SKB_CB(skb);

J
Johannes Berg 已提交
2234
	info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
2235
	info->flags |= IEEE80211_TX_CTL_NO_ACK;
2236
	info->band = band;
2237 2238 2239 2240 2241 2242 2243

	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;
2244 2245 2246 2247 2248
	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;
2249 2250
	txrc.ap = true;
	rate_control_get_rate(sdata, NULL, &txrc);
2251 2252

	info->control.vif = vif;
2253 2254 2255

	info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
	info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
2256
 out:
2257
	rcu_read_unlock();
2258 2259
	return skb;
}
2260
EXPORT_SYMBOL(ieee80211_beacon_get_tim);
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 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
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);

2340 2341 2342 2343 2344 2345 2346 2347 2348 2349 2350 2351 2352 2353 2354 2355 2356 2357 2358 2359 2360 2361 2362 2363 2364 2365 2366 2367 2368 2369 2370 2371 2372 2373 2374 2375 2376 2377 2378 2379 2380 2381 2382 2383 2384 2385 2386 2387 2388 2389
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);

2390
void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
2391
		       const void *frame, size_t frame_len,
2392
		       const struct ieee80211_tx_info *frame_txctl,
2393 2394 2395 2396
		       struct ieee80211_rts *rts)
{
	const struct ieee80211_hdr *hdr = frame;

2397 2398
	rts->frame_control =
	    cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
2399 2400
	rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
					       frame_txctl);
2401 2402 2403 2404 2405
	memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
	memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
}
EXPORT_SYMBOL(ieee80211_rts_get);

2406
void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
2407
			     const void *frame, size_t frame_len,
2408
			     const struct ieee80211_tx_info *frame_txctl,
2409 2410 2411 2412
			     struct ieee80211_cts *cts)
{
	const struct ieee80211_hdr *hdr = frame;

2413 2414
	cts->frame_control =
	    cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
2415 2416
	cts->duration = ieee80211_ctstoself_duration(hw, vif,
						     frame_len, frame_txctl);
2417 2418 2419 2420 2421
	memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
}
EXPORT_SYMBOL(ieee80211_ctstoself_get);

struct sk_buff *
2422
ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
2423
			  struct ieee80211_vif *vif)
2424 2425
{
	struct ieee80211_local *local = hw_to_local(hw);
2426
	struct sk_buff *skb = NULL;
2427
	struct sta_info *sta;
2428
	struct ieee80211_tx_data tx;
2429 2430
	struct ieee80211_sub_if_data *sdata;
	struct ieee80211_if_ap *bss = NULL;
2431
	struct beacon_data *beacon;
2432
	struct ieee80211_tx_info *info;
2433

2434
	sdata = vif_to_sdata(vif);
2435
	bss = &sdata->u.ap;
2436 2437 2438 2439

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

2440
	if (sdata->vif.type != NL80211_IFTYPE_AP || !beacon || !beacon->head)
2441
		goto out;
2442

2443
	if (bss->dtim_count != 0)
2444
		goto out; /* send buffered bc/mc only after DTIM beacon */
2445

2446 2447 2448
	while (1) {
		skb = skb_dequeue(&bss->ps_bc_buf);
		if (!skb)
2449
			goto out;
2450 2451 2452 2453 2454 2455 2456 2457 2458 2459 2460 2461
		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
2462
		if (!ieee80211_tx_prepare(sdata, &tx, skb))
2463 2464 2465
			break;
		dev_kfree_skb_any(skb);
	}
2466 2467 2468

	info = IEEE80211_SKB_CB(skb);

2469
	sta = tx.sta;
2470 2471
	tx.flags |= IEEE80211_TX_PS_BUFFERED;
	tx.channel = local->hw.conf.channel;
2472
	info->band = tx.channel->band;
2473

2474
	if (invoke_tx_handlers(&tx))
2475
		skb = NULL;
2476
 out:
2477
	rcu_read_unlock();
2478 2479 2480 2481

	return skb;
}
EXPORT_SYMBOL(ieee80211_get_buffered_bc);
J
Johannes Berg 已提交
2482

2483
void ieee80211_tx_skb(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
J
Johannes Berg 已提交
2484 2485 2486 2487 2488
{
	skb_set_mac_header(skb, 0);
	skb_set_network_header(skb, 0);
	skb_set_transport_header(skb, 0);

2489 2490 2491
	/* send all internal mgmt frames on VO */
	skb_set_queue_mapping(skb, 0);

2492 2493 2494 2495 2496 2497
	/*
	 * 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
2498
	ieee80211_xmit(sdata, skb);
2499
	local_bh_enable();
J
Johannes Berg 已提交
2500
}