tx.c 69.9 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_WDS)
		return TX_CONTINUE;

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

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	if (tx->flags & IEEE80211_TX_PS_BUFFERED)
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		return TX_CONTINUE;
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	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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	wiphy_debug(local->hw.wiphy, "PS buffers full - purged %d frames\n",
		    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
ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx)
{
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);

	if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol &&
		     tx->sdata->control_port_no_encrypt))
		info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;

	return TX_CONTINUE;
}

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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->ptk)))
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		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 != tx->sdata->control_port_protocol) &&
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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 */
560

561 562 563
		switch (tx->key->conf.cipher) {
		case WLAN_CIPHER_SUITE_WEP40:
		case WLAN_CIPHER_SUITE_WEP104:
564
			if (ieee80211_is_auth(hdr->frame_control))
565
				break;
566
		case WLAN_CIPHER_SUITE_TKIP:
567
			if (!ieee80211_is_data_present(hdr->frame_control))
568 569
				tx->key = NULL;
			break;
570
		case WLAN_CIPHER_SUITE_CCMP:
571 572 573 574
			if (!ieee80211_is_data_present(hdr->frame_control) &&
			    !ieee80211_use_mfp(hdr->frame_control, tx->sta,
					       tx->skb))
				tx->key = NULL;
575 576 577 578
			else
				skip_hw = (tx->key->conf.flags &
					   IEEE80211_KEY_FLAG_SW_MGMT) &&
					ieee80211_is_mgmt(hdr->frame_control);
579
			break;
580
		case WLAN_CIPHER_SUITE_AES_CMAC:
581 582 583
			if (!ieee80211_is_mgmt(hdr->frame_control))
				tx->key = NULL;
			break;
584
		}
585

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		if (!skip_hw && tx->key &&
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		    tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
588
			info->control.hw_key = &tx->key->conf;
589 590
	}

591
	return TX_CONTINUE;
592 593
}

594
static ieee80211_tx_result debug_noinline
595
ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
596
{
597
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
598 599 600
	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;
603 604
	bool inval = false, rts = false, short_preamble = false;
	struct ieee80211_tx_rate_control txrc;
605
	u32 sta_flags;
606

607
	memset(&txrc, 0, sizeof(txrc));
608

609
	sband = tx->local->hw.wiphy->bands[tx->channel->band];
610

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	len = min_t(u32, tx->skb->len + FCS_LEN,
612
			 tx->local->hw.wiphy->frag_threshold);
613 614 615 616 617 618 619

	/* 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;
620 621 622 623 624
	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;
625
	txrc.ap = tx->sdata->vif.type == NL80211_IFTYPE_AP;
626 627

	/* set up RTS protection if desired */
628
	if (len > tx->local->hw.wiphy->rts_threshold) {
629
		txrc.rts = rts = true;
630 631
	}

632 633 634 635 636 637 638 639 640 641
	/*
	 * 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;
642

643 644 645 646 647 648
	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.
	 */
649
	if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) &&
650 651 652 653 654
		 (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",
655
		 tx->sdata->name, hdr->addr1,
656 657
		 tx->channel->band ? 5 : 2))
		return TX_DROP;
658

659 660 661 662
	/*
	 * If we're associated with the sta at this point we know we can at
	 * least send the frame at the lowest bit rate.
	 */
663 664 665 666 667 668 669
	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];
670

671
	if (tx->sta)
672
		tx->sta->last_tx_rate = txrc.reported_rate;
673

674 675
	if (unlikely(!info->control.rates[0].count))
		info->control.rates[0].count = 1;
676

677 678 679 680
	if (WARN_ON_ONCE((info->control.rates[0].count > 1) &&
			 (info->flags & IEEE80211_TX_CTL_NO_ACK)))
		info->control.rates[0].count = 1;

681 682 683 684 685
	if (is_multicast_ether_addr(hdr->addr1)) {
		/*
		 * XXX: verify the rate is in the basic rateset
		 */
		return TX_CONTINUE;
686 687
	}

688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712
	/*
	 * 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;
713 714
	}

715 716 717 718 719 720 721 722 723 724 725 726 727 728
	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;
		}
729

730 731 732 733 734 735 736 737
		/*
		 * 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;
		}
738

739 740 741 742
		/* set up RTS protection if desired */
		if (rts)
			info->control.rates[i].flags |=
				IEEE80211_TX_RC_USE_RTS_CTS;
743

744
		/* RC is busted */
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		if (WARN_ON_ONCE(info->control.rates[i].idx >=
				 sband->n_bitrates)) {
747 748
			info->control.rates[i].idx = -1;
			continue;
749
		}
750

751 752 753 754 755 756 757 758 759 760 761 762 763
		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;
764 765
	}

766 767 768
	return TX_CONTINUE;
}

769 770 771 772 773 774 775 776 777
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;

778 779 780 781 782
	/*
	 * 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.
	 */
783
	if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR))
784 785
		return TX_CONTINUE;

786 787 788 789 790 791
	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.
	 */
797
	if (!ieee80211_is_data_qos(hdr->frame_control)) {
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798
		/* driver should assign sequence number */
799
		info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
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		/* 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;
803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827
		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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828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872
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;
}

873
static ieee80211_tx_result debug_noinline
874 875
ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
{
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876 877 878
	struct sk_buff *skb = tx->skb;
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
	struct ieee80211_hdr *hdr = (void *)skb->data;
879
	int frag_threshold = tx->local->hw.wiphy->frag_threshold;
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880 881
	int hdrlen;
	int fragnum;
882 883 884 885

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

886 887
	/*
	 * Warn when submitting a fragmented A-MPDU frame and drop it.
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888
	 * This scenario is handled in ieee80211_tx_prepare but extra
889
	 * caution taken here as fragmented ampdu may cause Tx stop.
890
	 */
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891
	if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
892 893
		return TX_DROP;

894
	hdrlen = ieee80211_hdrlen(hdr->frame_control);
895

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896
	/* internal error, why is TX_FRAGMENTED set? */
897
	if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))
J
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898
		return TX_DROP;
899

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900 901 902 903 904 905 906 907 908 909
	/*
	 * 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;
910

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911 912 913 914 915
	/* update duration/seq/flags of fragments */
	fragnum = 0;
	do {
		int next_len;
		const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
916

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917 918
		hdr = (void *)skb->data;
		info = IEEE80211_SKB_CB(skb);
919

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920 921 922
		if (skb->next) {
			hdr->frame_control |= morefrags;
			next_len = skb->next->len;
923 924 925 926 927 928 929 930 931 932
			/*
			 * 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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933 934 935
		} else {
			hdr->frame_control &= ~morefrags;
			next_len = 0;
936
		}
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937 938 939 940
		hdr->duration_id = ieee80211_duration(tx, 0, next_len);
		hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG);
		fragnum++;
	} while ((skb = skb->next));
941

942
	return TX_CONTINUE;
943 944
}

945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961
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;
}

962
static ieee80211_tx_result debug_noinline
963 964
ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
{
965 966
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);

967 968 969
	if (!tx->key)
		return TX_CONTINUE;

970 971 972
	switch (tx->key->conf.cipher) {
	case WLAN_CIPHER_SUITE_WEP40:
	case WLAN_CIPHER_SUITE_WEP104:
973
		return ieee80211_crypto_wep_encrypt(tx);
974
	case WLAN_CIPHER_SUITE_TKIP:
975
		return ieee80211_crypto_tkip_encrypt(tx);
976
	case WLAN_CIPHER_SUITE_CCMP:
977
		return ieee80211_crypto_ccmp_encrypt(tx);
978
	case WLAN_CIPHER_SUITE_AES_CMAC:
979
		return ieee80211_crypto_aes_cmac_encrypt(tx);
980 981 982 983 984 985 986 987
	default:
		/* handle hw-only algorithm */
		if (info->control.hw_key) {
			ieee80211_tx_set_protected(tx);
			return TX_CONTINUE;
		}
		break;

988 989 990 991 992
	}

	return TX_DROP;
}

993
static ieee80211_tx_result debug_noinline
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994 995
ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
{
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996 997 998 999
	struct sk_buff *skb = tx->skb;
	struct ieee80211_hdr *hdr;
	int next_len;
	bool group_addr;
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1000

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1001 1002
	do {
		hdr = (void *) skb->data;
1003 1004
		if (unlikely(ieee80211_is_pspoll(hdr->frame_control)))
			break; /* must not overwrite AID */
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1005 1006
		next_len = skb->next ? skb->next->len : 0;
		group_addr = is_multicast_ether_addr(hdr->addr1);
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1007

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1008 1009 1010
		hdr->duration_id =
			ieee80211_duration(tx, group_addr, next_len);
	} while ((skb = skb->next));
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1011 1012 1013 1014

	return TX_CONTINUE;
}

1015 1016 1017 1018 1019 1020
/* actual transmit path */

/*
 * deal with packet injection down monitor interface
 * with Radiotap Header -- only called for monitor mode interface
 */
1021 1022
static bool __ieee80211_parse_tx_radiotap(struct ieee80211_tx_data *tx,
					  struct sk_buff *skb)
1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034
{
	/*
	 * 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;
1035
	struct ieee80211_supported_band *sband;
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1036
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
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1037 1038
	int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len,
						   NULL);
1039

1040
	sband = tx->local->hw.wiphy->bands[tx->channel->band];
1041

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1042
	info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1043
	tx->flags &= ~IEEE80211_TX_FRAGMENTED;
1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073

	/*
	 * 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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1074
				if (skb->len < (iterator._max_length + FCS_LEN))
1075
					return false;
1076 1077 1078

				skb_trim(skb, skb->len - FCS_LEN);
			}
1079
			if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
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1080
				info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT;
1081
			if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
1082
				tx->flags |= IEEE80211_TX_FRAGMENTED;
1083 1084
			break;

1085 1086 1087 1088 1089 1090
		/*
		 * Please update the file
		 * Documentation/networking/mac80211-injection.txt
		 * when parsing new fields here.
		 */

1091 1092 1093 1094 1095 1096
		default:
			break;
		}
	}

	if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
1097
		return false;
1098 1099 1100

	/*
	 * remove the radiotap header
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1101
	 * iterator->_max_length was sanity-checked against
1102 1103
	 * skb->len by iterator init
	 */
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1104
	skb_pull(skb, iterator._max_length);
1105

1106
	return true;
1107 1108
}

1109 1110 1111 1112 1113 1114 1115 1116 1117 1118
static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx,
				  struct sk_buff *skb,
				  struct ieee80211_tx_info *info,
				  struct tid_ampdu_tx *tid_tx,
				  int tid)
{
	bool queued = false;

	if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
		info->flags |= IEEE80211_TX_CTL_AMPDU;
1119 1120 1121 1122 1123
	} else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) {
		/*
		 * nothing -- this aggregation session is being started
		 * but that might still fail with the driver
		 */
1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161
	} else {
		spin_lock(&tx->sta->lock);
		/*
		 * Need to re-check now, because we may get here
		 *
		 *  1) in the window during which the setup is actually
		 *     already done, but not marked yet because not all
		 *     packets are spliced over to the driver pending
		 *     queue yet -- if this happened we acquire the lock
		 *     either before or after the splice happens, but
		 *     need to recheck which of these cases happened.
		 *
		 *  2) during session teardown, if the OPERATIONAL bit
		 *     was cleared due to the teardown but the pointer
		 *     hasn't been assigned NULL yet (or we loaded it
		 *     before it was assigned) -- in this case it may
		 *     now be NULL which means we should just let the
		 *     packet pass through because splicing the frames
		 *     back is already done.
		 */
		tid_tx = tx->sta->ampdu_mlme.tid_tx[tid];

		if (!tid_tx) {
			/* do nothing, let packet pass through */
		} else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
			info->flags |= IEEE80211_TX_CTL_AMPDU;
		} else {
			queued = true;
			info->control.vif = &tx->sdata->vif;
			info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
			__skb_queue_tail(&tid_tx->pending, skb);
		}
		spin_unlock(&tx->sta->lock);
	}

	return queued;
}

1162 1163 1164
/*
 * initialises @tx
 */
1165
static ieee80211_tx_result
J
Johannes Berg 已提交
1166 1167 1168
ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
		     struct ieee80211_tx_data *tx,
		     struct sk_buff *skb)
1169
{
J
Johannes Berg 已提交
1170
	struct ieee80211_local *local = sdata->local;
1171
	struct ieee80211_hdr *hdr;
1172
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
S
Sujith 已提交
1173
	int hdrlen, tid;
1174
	u8 *qc;
1175 1176 1177 1178

	memset(tx, 0, sizeof(*tx));
	tx->skb = skb;
	tx->local = local;
J
Johannes Berg 已提交
1179
	tx->sdata = sdata;
1180
	tx->channel = local->hw.conf.channel;
1181
	/*
1182 1183
	 * Set this flag (used below to indicate "automatic fragmentation"),
	 * it will be cleared/left by radiotap as desired.
1184
	 */
1185
	tx->flags |= IEEE80211_TX_FRAGMENTED;
1186 1187

	/* process and remove the injection radiotap header */
1188
	if (unlikely(info->flags & IEEE80211_TX_INTFL_HAS_RADIOTAP)) {
1189
		if (!__ieee80211_parse_tx_radiotap(tx, skb))
1190
			return TX_DROP;
1191

1192
		/*
1193 1194 1195
		 * __ieee80211_parse_tx_radiotap has now removed
		 * the radiotap header that was present and pre-filled
		 * 'tx' with tx control information.
1196
		 */
1197
		info->flags &= ~IEEE80211_TX_INTFL_HAS_RADIOTAP;
1198 1199
	}

1200 1201 1202 1203 1204 1205 1206
	/*
	 * 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;

1207 1208
	hdr = (struct ieee80211_hdr *) skb->data;

1209
	if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1210
		tx->sta = rcu_dereference(sdata->u.vlan.sta);
1211 1212
		if (!tx->sta && sdata->dev->ieee80211_ptr->use_4addr)
			return TX_DROP;
1213 1214
	} else if (info->flags & IEEE80211_TX_CTL_INJECTED) {
		tx->sta = sta_info_get_bss(sdata, hdr->addr1);
1215
	}
1216
	if (!tx->sta)
1217
		tx->sta = sta_info_get(sdata, hdr->addr1);
1218

1219 1220 1221 1222
	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
1223 1224 1225
		qc = ieee80211_get_qos_ctl(hdr);
		tid = *qc & IEEE80211_QOS_CTL_TID_MASK;

1226 1227 1228
		tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
		if (tid_tx) {
			bool queued;
1229

1230 1231 1232 1233 1234 1235
			queued = ieee80211_tx_prep_agg(tx, skb, info,
						       tid_tx, tid);

			if (unlikely(queued))
				return TX_QUEUED;
		}
S
Sujith 已提交
1236 1237
	}

1238
	if (is_multicast_ether_addr(hdr->addr1)) {
1239
		tx->flags &= ~IEEE80211_TX_UNICAST;
1240
		info->flags |= IEEE80211_TX_CTL_NO_ACK;
1241
	} else {
1242
		tx->flags |= IEEE80211_TX_UNICAST;
1243 1244 1245 1246
		if (unlikely(local->wifi_wme_noack_test))
			info->flags |= IEEE80211_TX_CTL_NO_ACK;
		else
			info->flags &= ~IEEE80211_TX_CTL_NO_ACK;
1247
	}
1248

1249 1250
	if (tx->flags & IEEE80211_TX_FRAGMENTED) {
		if ((tx->flags & IEEE80211_TX_UNICAST) &&
1251
		    skb->len + FCS_LEN > local->hw.wiphy->frag_threshold &&
1252
		    !(info->flags & IEEE80211_TX_CTL_AMPDU))
1253
			tx->flags |= IEEE80211_TX_FRAGMENTED;
1254
		else
1255
			tx->flags &= ~IEEE80211_TX_FRAGMENTED;
1256 1257
	}

1258
	if (!tx->sta)
1259
		info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1260
	else if (test_and_clear_sta_flags(tx->sta, WLAN_STA_CLEAR_PS_FILT))
1261
		info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1262

1263
	hdrlen = ieee80211_hdrlen(hdr->frame_control);
1264 1265 1266 1267
	if (skb->len > hdrlen + sizeof(rfc1042_header) + 2) {
		u8 *pos = &skb->data[hdrlen + sizeof(rfc1042_header)];
		tx->ethertype = (pos[0] << 8) | pos[1];
	}
1268
	info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
1269

1270
	return TX_CONTINUE;
1271 1272
}

J
Johannes Berg 已提交
1273
static int __ieee80211_tx(struct ieee80211_local *local,
1274
			  struct sk_buff **skbp,
J
Johannes Berg 已提交
1275 1276
			  struct sta_info *sta,
			  bool txpending)
1277
{
1278
	struct sk_buff *skb = *skbp, *next;
1279
	struct ieee80211_tx_info *info;
1280
	struct ieee80211_sub_if_data *sdata;
J
Johannes Berg 已提交
1281
	unsigned long flags;
1282
	int ret, len;
J
Johannes Berg 已提交
1283
	bool fragm = false;
1284

J
Johannes Berg 已提交
1285
	while (skb) {
J
Johannes Berg 已提交
1286 1287 1288 1289 1290 1291 1292 1293 1294 1295
		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;
1296

1297 1298 1299
		info = IEEE80211_SKB_CB(skb);

		if (fragm)
1300
			info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT |
1301
					 IEEE80211_TX_CTL_FIRST_FRAGMENT);
1302

J
Johannes Berg 已提交
1303
		next = skb->next;
1304
		len = skb->len;
1305

J
Johannes Berg 已提交
1306 1307 1308
		if (next)
			info->flags |= IEEE80211_TX_CTL_MORE_FRAMES;

1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323
		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;
		}

J
Johannes Berg 已提交
1324 1325 1326 1327 1328
		if (sta && sta->uploaded)
			info->control.sta = &sta->sta;
		else
			info->control.sta = NULL;

1329
		ret = drv_tx(local, skb);
1330 1331 1332 1333
		if (WARN_ON(ret != NETDEV_TX_OK && skb->len != len)) {
			dev_kfree_skb(skb);
			ret = NETDEV_TX_OK;
		}
1334 1335
		if (ret != NETDEV_TX_OK) {
			info->control.vif = &sdata->vif;
J
Johannes Berg 已提交
1336
			return IEEE80211_TX_AGAIN;
1337 1338
		}

1339
		*skbp = skb = next;
J
Johannes Berg 已提交
1340 1341
		ieee80211_led_tx(local, 1);
		fragm = true;
1342
	}
J
Johannes Berg 已提交
1343

1344 1345 1346
	return IEEE80211_TX_OK;
}

1347 1348 1349 1350 1351 1352 1353
/*
 * 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;
1354
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1355 1356
	ieee80211_tx_result res = TX_DROP;

1357 1358 1359 1360 1361 1362 1363
#define CALL_TXH(txh) \
	do {				\
		res = txh(tx);		\
		if (res != TX_CONTINUE)	\
			goto txh_done;	\
	} while (0)

1364
	CALL_TXH(ieee80211_tx_h_dynamic_ps);
1365 1366
	CALL_TXH(ieee80211_tx_h_check_assoc);
	CALL_TXH(ieee80211_tx_h_ps_buf);
1367
	CALL_TXH(ieee80211_tx_h_check_control_port_protocol);
1368
	CALL_TXH(ieee80211_tx_h_select_key);
1369 1370
	if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
		CALL_TXH(ieee80211_tx_h_rate_ctrl);
1371 1372 1373 1374 1375

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

	CALL_TXH(ieee80211_tx_h_michael_mic_add);
1376 1377
	CALL_TXH(ieee80211_tx_h_sequence);
	CALL_TXH(ieee80211_tx_h_fragment);
1378
	/* handlers after fragment must be aware of tx info fragmentation! */
1379 1380 1381
	CALL_TXH(ieee80211_tx_h_stats);
	CALL_TXH(ieee80211_tx_h_encrypt);
	CALL_TXH(ieee80211_tx_h_calculate_duration);
1382
#undef CALL_TXH
1383

1384
 txh_done:
1385
	if (unlikely(res == TX_DROP)) {
1386
		I802_DEBUG_INC(tx->local->tx_handlers_drop);
J
Johannes Berg 已提交
1387 1388 1389 1390 1391 1392 1393
		while (skb) {
			struct sk_buff *next;

			next = skb->next;
			dev_kfree_skb(skb);
			skb = next;
		}
1394 1395
		return -1;
	} else if (unlikely(res == TX_QUEUED)) {
1396
		I802_DEBUG_INC(tx->local->tx_handlers_queued);
1397 1398 1399 1400 1401 1402
		return -1;
	}

	return 0;
}

J
Johannes Berg 已提交
1403 1404
static void ieee80211_tx(struct ieee80211_sub_if_data *sdata,
			 struct sk_buff *skb, bool txpending)
1405
{
J
Johannes Berg 已提交
1406
	struct ieee80211_local *local = sdata->local;
1407
	struct ieee80211_tx_data tx;
1408
	ieee80211_tx_result res_prepare;
1409
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1410 1411 1412
	struct sk_buff *next;
	unsigned long flags;
	int ret, retries;
1413
	u16 queue;
1414

1415 1416
	queue = skb_get_queue_mapping(skb);

1417 1418
	if (unlikely(skb->len < 10)) {
		dev_kfree_skb(skb);
1419
		return;
1420 1421
	}

1422 1423
	rcu_read_lock();

1424
	/* initialises tx */
J
Johannes Berg 已提交
1425
	res_prepare = ieee80211_tx_prepare(sdata, &tx, skb);
1426

1427
	if (unlikely(res_prepare == TX_DROP)) {
1428
		dev_kfree_skb(skb);
1429
		rcu_read_unlock();
1430 1431 1432 1433
		return;
	} else if (unlikely(res_prepare == TX_QUEUED)) {
		rcu_read_unlock();
		return;
1434 1435
	}

1436
	tx.channel = local->hw.conf.channel;
1437
	info->band = tx.channel->band;
1438

1439 1440
	if (invoke_tx_handlers(&tx))
		goto out;
1441

1442 1443
	retries = 0;
 retry:
J
Johannes Berg 已提交
1444
	ret = __ieee80211_tx(local, &tx.skb, tx.sta, txpending);
1445 1446 1447 1448
	switch (ret) {
	case IEEE80211_TX_OK:
		break;
	case IEEE80211_TX_AGAIN:
1449 1450 1451 1452 1453
		/*
		 * 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.
		 */
1454 1455 1456 1457 1458
		if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
			goto drop;
		/* fall through */
	case IEEE80211_TX_PENDING:
		skb = tx.skb;
1459

1460
		spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1461

J
Johannes Berg 已提交
1462 1463 1464 1465 1466 1467
		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
			 */
1468 1469 1470
			do {
				next = skb->next;
				skb->next = NULL;
1471
				if (unlikely(txpending))
J
Johannes Berg 已提交
1472 1473
					__skb_queue_head(&local->pending[queue],
							 skb);
1474
				else
J
Johannes Berg 已提交
1475 1476
					__skb_queue_tail(&local->pending[queue],
							 skb);
1477 1478 1479 1480 1481
			} while ((skb = next));

			spin_unlock_irqrestore(&local->queue_stop_reason_lock,
					       flags);
		} else {
J
Johannes Berg 已提交
1482 1483 1484 1485
			/*
			 * otherwise retry, but this is a race condition or
			 * a driver bug (which we warn about if it persists)
			 */
1486 1487 1488 1489
			spin_unlock_irqrestore(&local->queue_stop_reason_lock,
					       flags);

			retries++;
J
Johannes Berg 已提交
1490
			if (WARN(retries > 10, "tx refused but queue active\n"))
1491
				goto drop;
1492 1493 1494
			goto retry;
		}
	}
1495
 out:
1496
	rcu_read_unlock();
1497
	return;
1498 1499

 drop:
1500
	rcu_read_unlock();
J
Johannes Berg 已提交
1501 1502 1503 1504 1505 1506 1507

	skb = tx.skb;
	while (skb) {
		next = skb->next;
		dev_kfree_skb(skb);
		skb = next;
	}
1508 1509 1510 1511
}

/* device xmit handlers */

1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539
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)) {
J
Joe Perches 已提交
1540 1541
		wiphy_debug(local->hw.wiphy,
			    "failed to reallocate TX buffer\n");
1542 1543 1544 1545 1546 1547 1548 1549 1550
		return -ENOMEM;
	}

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

	return 0;
}

J
Johannes Berg 已提交
1551 1552
static void ieee80211_xmit(struct ieee80211_sub_if_data *sdata,
			   struct sk_buff *skb)
1553
{
J
Johannes Berg 已提交
1554
	struct ieee80211_local *local = sdata->local;
1555
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1556
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
J
Johannes Berg 已提交
1557
	struct ieee80211_sub_if_data *tmp_sdata;
1558
	int headroom;
1559
	bool may_encrypt;
1560

1561 1562
	rcu_read_lock();

1563
	if (unlikely(sdata->vif.type == NL80211_IFTYPE_MONITOR)) {
1564 1565 1566
		int hdrlen;
		u16 len_rthdr;

1567 1568
		info->flags |= IEEE80211_TX_CTL_INJECTED |
			       IEEE80211_TX_INTFL_HAS_RADIOTAP;
1569 1570

		len_rthdr = ieee80211_get_radiotap_len(skb->data);
1571
		hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585
		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
1586
			list_for_each_entry_rcu(tmp_sdata, &local->interfaces,
1587
						list) {
1588
				if (!ieee80211_sdata_running(tmp_sdata))
1589
					continue;
1590 1591 1592 1593 1594 1595
				if (tmp_sdata->vif.type ==
				    NL80211_IFTYPE_MONITOR ||
				    tmp_sdata->vif.type ==
				    NL80211_IFTYPE_AP_VLAN ||
					tmp_sdata->vif.type ==
				    NL80211_IFTYPE_WDS)
1596
					continue;
1597
				if (compare_ether_addr(tmp_sdata->vif.addr,
1598
						       hdr->addr2) == 0) {
J
Johannes Berg 已提交
1599
					sdata = tmp_sdata;
1600 1601 1602 1603
					break;
				}
			}
		}
1604 1605
	}

J
Johannes Berg 已提交
1606
	may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT);
1607

J
Johannes Berg 已提交
1608
	headroom = local->tx_headroom;
1609 1610 1611 1612 1613
	if (may_encrypt)
		headroom += IEEE80211_ENCRYPT_HEADROOM;
	headroom -= skb_headroom(skb);
	headroom = max_t(int, 0, headroom);

J
Johannes Berg 已提交
1614
	if (ieee80211_skb_resize(local, skb, headroom, may_encrypt)) {
1615
		dev_kfree_skb(skb);
1616
		rcu_read_unlock();
J
Johannes Berg 已提交
1617
		return;
1618 1619
	}

1620
	hdr = (struct ieee80211_hdr *) skb->data;
1621
	info->control.vif = &sdata->vif;
1622

1623 1624 1625 1626 1627
	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 */
1628
				rcu_read_unlock();
1629 1630 1631
				return;
			}

1632
	ieee80211_set_qos_hdr(local, skb);
J
Johannes Berg 已提交
1633
	ieee80211_tx(sdata, skb, false);
1634
	rcu_read_unlock();
1635 1636
}

1637 1638
netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
					 struct net_device *dev)
1639 1640
{
	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1641
	struct ieee80211_channel *chan = local->hw.conf.channel;
1642 1643
	struct ieee80211_radiotap_header *prthdr =
		(struct ieee80211_radiotap_header *)skb->data;
J
Johannes Berg 已提交
1644
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1645
	u16 len_rthdr;
1646

1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666
	/*
	 * 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;

1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680
	/* 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 */
1681 1682 1683 1684 1685 1686 1687

	/*
	 * 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
	 */
1688
	skb_set_mac_header(skb, len_rthdr);
1689
	/*
1690 1691
	 * 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
1692
	 */
1693 1694
	skb_set_network_header(skb, len_rthdr);
	skb_set_transport_header(skb, len_rthdr);
1695

J
Johannes Berg 已提交
1696 1697
	memset(info, 0, sizeof(*info));

1698 1699
	info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;

J
Johannes Berg 已提交
1700 1701
	/* pass the radiotap header up to xmit */
	ieee80211_xmit(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1702
	return NETDEV_TX_OK;
1703 1704 1705 1706

fail:
	dev_kfree_skb(skb);
	return NETDEV_TX_OK; /* meaning, we dealt with the skb */
1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723
}

/**
 * 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).
 */
1724 1725
netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
				    struct net_device *dev)
1726
{
1727 1728
	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
	struct ieee80211_local *local = sdata->local;
J
Johannes Berg 已提交
1729
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1730
	int ret = NETDEV_TX_BUSY, head_need;
1731 1732
	u16 ethertype, hdrlen,  meshhdrlen = 0;
	__le16 fc;
1733
	struct ieee80211_hdr hdr;
1734
	struct ieee80211s_hdr mesh_hdr __maybe_unused;
1735 1736
	const u8 *encaps_data;
	int encaps_len, skip_header_bytes;
1737
	int nh_pos, h_pos;
1738
	struct sta_info *sta = NULL;
1739
	u32 sta_flags = 0;
1740 1741

	if (unlikely(skb->len < ETH_HLEN)) {
1742
		ret = NETDEV_TX_OK;
1743 1744 1745 1746 1747 1748 1749 1750 1751
		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];
1752
	fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
1753

1754
	switch (sdata->vif.type) {
1755
	case NL80211_IFTYPE_AP_VLAN:
1756
		rcu_read_lock();
1757
		sta = rcu_dereference(sdata->u.vlan.sta);
1758 1759 1760 1761
		if (sta) {
			fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
			/* RA TA DA SA */
			memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN);
1762
			memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1763 1764 1765 1766 1767 1768 1769 1770 1771 1772
			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:
1773
		fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
1774 1775
		/* DA BSSID SA */
		memcpy(hdr.addr1, skb->data, ETH_ALEN);
1776
		memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1777 1778
		memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
		hdrlen = 24;
1779
		break;
1780
	case NL80211_IFTYPE_WDS:
1781
		fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1782 1783
		/* RA TA DA SA */
		memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
1784
		memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1785 1786 1787
		memcpy(hdr.addr3, skb->data, ETH_ALEN);
		memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
		hdrlen = 30;
1788
		break;
1789
#ifdef CONFIG_MAC80211_MESH
1790
	case NL80211_IFTYPE_MESH_POINT:
1791
		if (!sdata->u.mesh.mshcfg.dot11MeshTTL) {
1792
			/* Do not send frames with mesh_ttl == 0 */
1793
			sdata->u.mesh.mshstats.dropped_frames_ttl++;
1794
			ret = NETDEV_TX_OK;
1795
			goto fail;
1796
		}
1797

1798 1799
		if (compare_ether_addr(sdata->vif.addr,
				       skb->data + ETH_ALEN) == 0) {
1800 1801 1802 1803
			hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
					skb->data, skb->data + ETH_ALEN);
			meshhdrlen = ieee80211_new_mesh_header(&mesh_hdr,
					sdata, NULL, NULL, NULL);
1804 1805 1806
		} else {
			/* packet from other interface */
			struct mesh_path *mppath;
1807
			int is_mesh_mcast = 1;
1808
			const u8 *mesh_da;
1809

1810
			rcu_read_lock();
1811
			if (is_multicast_ether_addr(skb->data))
1812 1813
				/* DA TA mSA AE:SA */
				mesh_da = skb->data;
1814
			else {
1815 1816 1817
				static const u8 bcast[ETH_ALEN] =
					{ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };

1818
				mppath = mpp_path_lookup(skb->data, sdata);
1819 1820 1821 1822
				if (mppath) {
					/* RA TA mDA mSA AE:DA SA */
					mesh_da = mppath->mpp;
					is_mesh_mcast = 0;
1823
				} else {
1824
					/* DA TA mSA AE:SA */
1825 1826
					mesh_da = bcast;
				}
1827
			}
1828
			hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
1829
					mesh_da, sdata->vif.addr);
1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844
			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);
1845 1846

		}
1847 1848
		break;
#endif
1849
	case NL80211_IFTYPE_STATION:
1850
		memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
1851 1852
		if (sdata->u.mgd.use_4addr &&
		    cpu_to_be16(ethertype) != sdata->control_port_protocol) {
1853 1854
			fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
			/* RA TA DA SA */
1855
			memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1856 1857 1858 1859 1860 1861 1862 1863 1864 1865
			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;
		}
1866
		break;
1867
	case NL80211_IFTYPE_ADHOC:
1868 1869 1870
		/* DA SA BSSID */
		memcpy(hdr.addr1, skb->data, ETH_ALEN);
		memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1871
		memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN);
1872
		hdrlen = 24;
1873 1874
		break;
	default:
1875
		ret = NETDEV_TX_OK;
1876 1877 1878
		goto fail;
	}

1879 1880 1881 1882 1883 1884
	/*
	 * 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)) {
1885
		rcu_read_lock();
1886 1887
		sta = sta_info_get(sdata, hdr.addr1);
		if (sta)
1888
			sta_flags = get_sta_flags(sta);
1889
		rcu_read_unlock();
1890 1891
	}

1892
	/* receiver and we are QoS enabled, use a QoS type frame */
1893
	if ((sta_flags & WLAN_STA_WME) && local->hw.queues >= 4) {
1894
		fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
1895 1896 1897 1898
		hdrlen += 2;
	}

	/*
1899 1900
	 * Drop unicast frames to unauthorised stations unless they are
	 * EAPOL frames from the local station.
1901
	 */
1902 1903
	if (!ieee80211_vif_is_mesh(&sdata->vif) &&
		unlikely(!is_multicast_ether_addr(hdr.addr1) &&
1904
		      !(sta_flags & WLAN_STA_AUTHORIZED) &&
1905
		      !(cpu_to_be16(ethertype) == sdata->control_port_protocol &&
1906
		       compare_ether_addr(sdata->vif.addr,
1907 1908 1909
					  skb->data + ETH_ALEN) == 0))) {
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
		if (net_ratelimit())
1910
			printk(KERN_DEBUG "%s: dropped frame to %pM"
1911
			       " (unauthorized port)\n", dev->name,
1912
			       hdr.addr1);
1913 1914 1915 1916
#endif

		I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);

1917
		ret = NETDEV_TX_OK;
1918 1919 1920
		goto fail;
	}

1921
	hdr.frame_control = fc;
1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942
	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;

1943
	head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
1944

1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955
	/*
	 * 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.
	 */
1956

1957
	if (head_need > 0 || skb_cloned(skb)) {
1958 1959 1960 1961
		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))
1962 1963 1964 1965 1966 1967 1968 1969
			goto fail;
	}

	if (encaps_data) {
		memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
		nh_pos += encaps_len;
		h_pos += encaps_len;
	}
1970

1971
#ifdef CONFIG_MAC80211_MESH
1972 1973 1974 1975 1976
	if (meshhdrlen > 0) {
		memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
		nh_pos += meshhdrlen;
		h_pos += meshhdrlen;
	}
1977
#endif
1978

1979
	if (ieee80211_is_data_qos(fc)) {
1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991
		__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);

1992 1993 1994
	nh_pos += hdrlen;
	h_pos += hdrlen;

1995 1996
	dev->stats.tx_packets++;
	dev->stats.tx_bytes += skb->len;
1997 1998 1999 2000 2001 2002 2003 2004

	/* 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
2005 2006
	memset(info, 0, sizeof(*info));

2007
	dev->trans_start = jiffies;
J
Johannes Berg 已提交
2008
	ieee80211_xmit(sdata, skb);
2009

2010
	return NETDEV_TX_OK;
2011 2012

 fail:
2013
	if (ret == NETDEV_TX_OK)
2014 2015 2016 2017 2018 2019
		dev_kfree_skb(skb);

	return ret;
}


2020 2021 2022 2023
/*
 * ieee80211_clear_tx_pending may not be called in a context where
 * it is possible that it packets could come in again.
 */
2024 2025
void ieee80211_clear_tx_pending(struct ieee80211_local *local)
{
J
Johannes Berg 已提交
2026
	int i;
2027

2028 2029
	for (i = 0; i < local->hw.queues; i++)
		skb_queue_purge(&local->pending[i]);
2030 2031
}

2032 2033 2034 2035 2036 2037 2038 2039 2040 2041
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;

2042
	sdata = vif_to_sdata(info->control.vif);
2043 2044

	if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) {
2045
		ieee80211_tx(sdata, skb, true);
2046 2047
	} else {
		hdr = (struct ieee80211_hdr *)skb->data;
2048
		sta = sta_info_get(sdata, hdr->addr1);
2049

J
Johannes Berg 已提交
2050
		ret = __ieee80211_tx(local, &skb, sta, true);
2051 2052 2053 2054 2055 2056 2057
		if (ret != IEEE80211_TX_OK)
			result = false;
	}

	return result;
}

2058
/*
J
Johannes Berg 已提交
2059
 * Transmit all pending packets. Called from tasklet.
2060
 */
2061 2062 2063
void ieee80211_tx_pending(unsigned long data)
{
	struct ieee80211_local *local = (struct ieee80211_local *)data;
2064
	struct ieee80211_sub_if_data *sdata;
2065
	unsigned long flags;
2066
	int i;
J
Johannes Berg 已提交
2067
	bool txok;
2068

2069
	rcu_read_lock();
2070

J
Johannes Berg 已提交
2071
	spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
2072 2073 2074 2075 2076
	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
2077
		if (local->queue_stop_reasons[i] ||
2078
		    skb_queue_empty(&local->pending[i]))
2079
			continue;
2080

2081
		while (!skb_queue_empty(&local->pending[i])) {
J
Johannes Berg 已提交
2082
			struct sk_buff *skb = __skb_dequeue(&local->pending[i]);
2083 2084
			struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);

2085 2086 2087 2088 2089
			if (WARN_ON(!info->control.vif)) {
				kfree_skb(skb);
				continue;
			}

J
Johannes Berg 已提交
2090 2091 2092 2093 2094 2095 2096 2097 2098
			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)
2099
				break;
2100
		}
2101 2102 2103

		if (skb_queue_empty(&local->pending[i]))
			list_for_each_entry_rcu(sdata, &local->interfaces, list)
J
Johannes Berg 已提交
2104
				netif_wake_subqueue(sdata->dev, i);
2105
	}
J
Johannes Berg 已提交
2106
	spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
2107

2108
	rcu_read_unlock();
2109 2110 2111 2112
}

/* functions for drivers to get certain frames */

R
Rami Rosen 已提交
2113
static void ieee80211_beacon_add_tim(struct ieee80211_if_ap *bss,
2114 2115
				     struct sk_buff *skb,
				     struct beacon_data *beacon)
2116 2117 2118 2119 2120 2121 2122 2123 2124 2125 2126 2127 2128 2129
{
	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)
2130
		bss->dtim_count = beacon->dtim_period - 1;
2131 2132 2133 2134 2135 2136 2137
	else
		bss->dtim_count--;

	tim = pos = (u8 *) skb_put(skb, 6);
	*pos++ = WLAN_EID_TIM;
	*pos++ = 4;
	*pos++ = bss->dtim_count;
2138
	*pos++ = beacon->dtim_period;
2139 2140 2141 2142 2143 2144 2145 2146 2147 2148 2149 2150 2151 2152 2153 2154 2155 2156 2157 2158 2159 2160 2161 2162 2163 2164 2165 2166 2167 2168 2169 2170 2171 2172 2173 2174

	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 */
	}
}

2175 2176 2177
struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
					 struct ieee80211_vif *vif,
					 u16 *tim_offset, u16 *tim_length)
2178 2179
{
	struct ieee80211_local *local = hw_to_local(hw);
2180
	struct sk_buff *skb = NULL;
2181
	struct ieee80211_tx_info *info;
2182 2183
	struct ieee80211_sub_if_data *sdata = NULL;
	struct ieee80211_if_ap *ap = NULL;
2184
	struct beacon_data *beacon;
2185
	struct ieee80211_supported_band *sband;
2186
	enum ieee80211_band band = local->hw.conf.channel->band;
2187
	struct ieee80211_tx_rate_control txrc;
2188

2189
	sband = local->hw.wiphy->bands[band];
2190 2191

	rcu_read_lock();
2192

2193
	sdata = vif_to_sdata(vif);
2194

2195 2196 2197 2198 2199
	if (tim_offset)
		*tim_offset = 0;
	if (tim_length)
		*tim_length = 0;

2200
	if (sdata->vif.type == NL80211_IFTYPE_AP) {
2201 2202
		ap = &sdata->u.ap;
		beacon = rcu_dereference(ap->beacon);
J
Johannes Berg 已提交
2203 2204 2205 2206 2207 2208 2209 2210 2211 2212
		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;
2213

J
Johannes Berg 已提交
2214 2215 2216
			skb_reserve(skb, local->tx_headroom);
			memcpy(skb_put(skb, beacon->head_len), beacon->head,
			       beacon->head_len);
2217

2218 2219 2220 2221 2222 2223 2224 2225
			/*
			 * 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
2226
				ieee80211_beacon_add_tim(ap, skb, beacon);
2227 2228 2229 2230
			} else {
				unsigned long flags;

				spin_lock_irqsave(&local->sta_lock, flags);
R
Rami Rosen 已提交
2231
				ieee80211_beacon_add_tim(ap, skb, beacon);
2232 2233
				spin_unlock_irqrestore(&local->sta_lock, flags);
			}
2234

2235 2236 2237 2238 2239
			if (tim_offset)
				*tim_offset = beacon->head_len;
			if (tim_length)
				*tim_length = skb->len - beacon->head_len;

J
Johannes Berg 已提交
2240 2241 2242
			if (beacon->tail)
				memcpy(skb_put(skb, beacon->tail_len),
				       beacon->tail, beacon->tail_len);
2243 2244
		} else
			goto out;
2245
	} else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
2246
		struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
2247
		struct ieee80211_hdr *hdr;
2248
		struct sk_buff *presp = rcu_dereference(ifibss->presp);
2249

2250
		if (!presp)
2251 2252
			goto out;

2253
		skb = skb_copy(presp, GFP_ATOMIC);
2254 2255 2256 2257
		if (!skb)
			goto out;

		hdr = (struct ieee80211_hdr *) skb->data;
2258 2259
		hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
						 IEEE80211_STYPE_BEACON);
J
Johannes Berg 已提交
2260
	} else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2261 2262 2263
		struct ieee80211_mgmt *mgmt;
		u8 *pos;

J
Johannes Berg 已提交
2264 2265 2266 2267 2268 2269 2270 2271 2272
		/* 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));
2273 2274
		mgmt->frame_control =
		    cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_BEACON);
J
Johannes Berg 已提交
2275
		memset(mgmt->da, 0xff, ETH_ALEN);
2276 2277
		memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
		memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
J
Johannes Berg 已提交
2278
		mgmt->u.beacon.beacon_int =
2279
			cpu_to_le16(sdata->vif.bss_conf.beacon_int);
J
Johannes Berg 已提交
2280 2281 2282 2283 2284 2285
		mgmt->u.beacon.capab_info = 0x0; /* 0x0 for MPs */

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

2286
		mesh_mgmt_ies_add(skb, sdata);
2287 2288
	} else {
		WARN_ON(1);
2289
		goto out;
2290 2291
	}

2292 2293
	info = IEEE80211_SKB_CB(skb);

J
Johannes Berg 已提交
2294
	info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
2295
	info->flags |= IEEE80211_TX_CTL_NO_ACK;
2296
	info->band = band;
2297 2298 2299 2300 2301 2302 2303

	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;
2304 2305 2306 2307 2308
	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;
2309 2310
	txrc.ap = true;
	rate_control_get_rate(sdata, NULL, &txrc);
2311 2312

	info->control.vif = vif;
2313

2314 2315 2316
	info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT |
			IEEE80211_TX_CTL_ASSIGN_SEQ |
			IEEE80211_TX_CTL_FIRST_FRAGMENT;
2317
 out:
2318
	rcu_read_unlock();
2319 2320
	return skb;
}
2321
EXPORT_SYMBOL(ieee80211_beacon_get_tim);
2322

2323 2324 2325 2326 2327 2328 2329 2330 2331 2332 2333 2334 2335 2336 2337 2338 2339 2340 2341 2342 2343 2344 2345 2346 2347 2348 2349 2350 2351 2352 2353 2354 2355 2356 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 2390 2391 2392 2393 2394 2395 2396 2397 2398 2399 2400
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);

2401 2402 2403 2404 2405 2406 2407 2408 2409 2410 2411 2412 2413 2414 2415 2416 2417 2418 2419 2420 2421 2422 2423 2424 2425 2426 2427 2428 2429 2430 2431 2432 2433 2434 2435 2436 2437 2438 2439 2440 2441 2442 2443 2444 2445 2446 2447 2448 2449 2450
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);

2451
void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
2452
		       const void *frame, size_t frame_len,
2453
		       const struct ieee80211_tx_info *frame_txctl,
2454 2455 2456 2457
		       struct ieee80211_rts *rts)
{
	const struct ieee80211_hdr *hdr = frame;

2458 2459
	rts->frame_control =
	    cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
2460 2461
	rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
					       frame_txctl);
2462 2463 2464 2465 2466
	memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
	memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
}
EXPORT_SYMBOL(ieee80211_rts_get);

2467
void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
2468
			     const void *frame, size_t frame_len,
2469
			     const struct ieee80211_tx_info *frame_txctl,
2470 2471 2472 2473
			     struct ieee80211_cts *cts)
{
	const struct ieee80211_hdr *hdr = frame;

2474 2475
	cts->frame_control =
	    cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
2476 2477
	cts->duration = ieee80211_ctstoself_duration(hw, vif,
						     frame_len, frame_txctl);
2478 2479 2480 2481 2482
	memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
}
EXPORT_SYMBOL(ieee80211_ctstoself_get);

struct sk_buff *
2483
ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
2484
			  struct ieee80211_vif *vif)
2485 2486
{
	struct ieee80211_local *local = hw_to_local(hw);
2487
	struct sk_buff *skb = NULL;
2488
	struct sta_info *sta;
2489
	struct ieee80211_tx_data tx;
2490 2491
	struct ieee80211_sub_if_data *sdata;
	struct ieee80211_if_ap *bss = NULL;
2492
	struct beacon_data *beacon;
2493
	struct ieee80211_tx_info *info;
2494

2495
	sdata = vif_to_sdata(vif);
2496
	bss = &sdata->u.ap;
2497 2498 2499 2500

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

2501
	if (sdata->vif.type != NL80211_IFTYPE_AP || !beacon || !beacon->head)
2502
		goto out;
2503

2504
	if (bss->dtim_count != 0)
2505
		goto out; /* send buffered bc/mc only after DTIM beacon */
2506

2507 2508 2509
	while (1) {
		skb = skb_dequeue(&bss->ps_bc_buf);
		if (!skb)
2510
			goto out;
2511 2512 2513 2514 2515 2516 2517 2518 2519 2520 2521 2522
		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
2523
		if (!ieee80211_tx_prepare(sdata, &tx, skb))
2524 2525 2526
			break;
		dev_kfree_skb_any(skb);
	}
2527 2528 2529

	info = IEEE80211_SKB_CB(skb);

2530
	sta = tx.sta;
2531 2532
	tx.flags |= IEEE80211_TX_PS_BUFFERED;
	tx.channel = local->hw.conf.channel;
2533
	info->band = tx.channel->band;
2534

2535
	if (invoke_tx_handlers(&tx))
2536
		skb = NULL;
2537
 out:
2538
	rcu_read_unlock();
2539 2540 2541 2542

	return skb;
}
EXPORT_SYMBOL(ieee80211_get_buffered_bc);
J
Johannes Berg 已提交
2543

2544
void ieee80211_tx_skb(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
J
Johannes Berg 已提交
2545 2546 2547 2548 2549
{
	skb_set_mac_header(skb, 0);
	skb_set_network_header(skb, 0);
	skb_set_transport_header(skb, 0);

2550 2551 2552
	/* send all internal mgmt frames on VO */
	skb_set_queue_mapping(skb, 0);

2553 2554 2555 2556 2557 2558
	/*
	 * 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
2559
	ieee80211_xmit(sdata, skb);
2560
	local_bh_enable();
J
Johannes Berg 已提交
2561
}