tx.c 67.9 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_MESH_POINT)
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		return TX_CONTINUE;

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	if (tx->flags & IEEE80211_TX_PS_BUFFERED)
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		return TX_CONTINUE;
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	sta_flags = tx->sta ? get_sta_flags(tx->sta) : 0;
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	if (likely(tx->flags & IEEE80211_TX_UNICAST)) {
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		if (unlikely(!(sta_flags & WLAN_STA_ASSOC) &&
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			     tx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
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			     ieee80211_is_data(hdr->frame_control))) {
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#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
			printk(KERN_DEBUG "%s: dropped data frame to not "
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			       "associated station %pM\n",
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			       tx->sdata->name, hdr->addr1);
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#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
			I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
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			return TX_DROP;
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		}
	} else {
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		if (unlikely(ieee80211_is_data(hdr->frame_control) &&
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			     tx->local->num_sta == 0 &&
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			     tx->sdata->vif.type != NL80211_IFTYPE_ADHOC)) {
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			/*
			 * No associated STAs - no need to send multicast
			 * frames.
			 */
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			return TX_DROP;
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		}
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		return TX_CONTINUE;
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	}

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	return TX_CONTINUE;
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}

/* This function is called whenever the AP is about to exceed the maximum limit
 * of buffered frames for power saving STAs. This situation should not really
 * happen often during normal operation, so dropping the oldest buffered packet
 * from each queue should be OK to make some room for new frames. */
static void purge_old_ps_buffers(struct ieee80211_local *local)
{
	int total = 0, purged = 0;
	struct sk_buff *skb;
	struct ieee80211_sub_if_data *sdata;
	struct sta_info *sta;

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	/*
	 * virtual interfaces are protected by RCU
	 */
	rcu_read_lock();

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

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	list_for_each_entry_rcu(sta, &local->sta_list, list) {
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		skb = skb_dequeue(&sta->ps_tx_buf);
		if (skb) {
			purged++;
			dev_kfree_skb(skb);
		}
		total += skb_queue_len(&sta->ps_tx_buf);
	}
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	rcu_read_unlock();
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	local->total_ps_buffered = total;
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#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
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	printk(KERN_DEBUG "%s: PS buffers full - purged %d frames\n",
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	       wiphy_name(local->hw.wiphy), purged);
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#endif
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}

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static ieee80211_tx_result
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ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx)
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{
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	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
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	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
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	/*
	 * broadcast/multicast frame
	 *
	 * If any of the associated stations is in power save mode,
	 * the frame is buffered to be sent after DTIM beacon frame.
	 * This is done either by the hardware or us.
	 */

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	/* powersaving STAs only in AP/VLAN mode */
	if (!tx->sdata->bss)
		return TX_CONTINUE;

	/* no buffering for ordered frames */
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	if (ieee80211_has_order(hdr->frame_control))
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		return TX_CONTINUE;
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	/* no stations in PS mode */
	if (!atomic_read(&tx->sdata->bss->num_sta_ps))
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		return TX_CONTINUE;
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	info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM;
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	/* device releases frame after DTIM beacon */
	if (!(tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING))
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		return TX_CONTINUE;

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	/* buffered in mac80211 */
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	if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
		purge_old_ps_buffers(tx->local);

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

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static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta,
			     struct sk_buff *skb)
{
	if (!ieee80211_is_mgmt(fc))
		return 0;

	if (sta == NULL || !test_sta_flags(sta, WLAN_STA_MFP))
		return 0;

	if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *)
					    skb->data))
		return 0;

	return 1;
}

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static ieee80211_tx_result
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ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx)
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{
	struct sta_info *sta = tx->sta;
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	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
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	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
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	u32 staflags;
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	if (unlikely(!sta ||
		     ieee80211_is_probe_resp(hdr->frame_control) ||
		     ieee80211_is_auth(hdr->frame_control) ||
		     ieee80211_is_assoc_resp(hdr->frame_control) ||
		     ieee80211_is_reassoc_resp(hdr->frame_control)))
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		return TX_CONTINUE;
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	staflags = get_sta_flags(sta);

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

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		info->control.jiffies = jiffies;
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		info->control.vif = &tx->sdata->vif;
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		info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
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		skb_queue_tail(&sta->ps_tx_buf, tx->skb);
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		return TX_QUEUED;
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	}
#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
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	else if (unlikely(staflags & WLAN_STA_PS_STA)) {
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		printk(KERN_DEBUG "%s: STA %pM in PS mode, but pspoll "
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		       "set -> send frame\n", tx->sdata->name,
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		       sta->sta.addr);
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	}
#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */

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	return TX_CONTINUE;
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}

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static ieee80211_tx_result debug_noinline
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ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx)
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{
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	if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED))
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		return TX_CONTINUE;
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	if (tx->flags & IEEE80211_TX_UNICAST)
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		return ieee80211_tx_h_unicast_ps_buf(tx);
	else
		return ieee80211_tx_h_multicast_ps_buf(tx);
}

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static ieee80211_tx_result debug_noinline
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ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
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{
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	struct ieee80211_key *key = NULL;
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	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
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	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
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	if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT))
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		tx->key = NULL;
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	else if (tx->sta && (key = rcu_dereference(tx->sta->key)))
		tx->key = key;
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	else if (ieee80211_is_mgmt(hdr->frame_control) &&
		 (key = rcu_dereference(tx->sdata->default_mgmt_key)))
		tx->key = key;
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	else if ((key = rcu_dereference(tx->sdata->default_key)))
		tx->key = key;
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	else if (tx->sdata->drop_unencrypted &&
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		 (tx->skb->protocol != cpu_to_be16(ETH_P_PAE)) &&
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		 !(info->flags & IEEE80211_TX_CTL_INJECTED) &&
		 (!ieee80211_is_robust_mgmt_frame(hdr) ||
		  (ieee80211_is_action(hdr->frame_control) &&
		   tx->sta && test_sta_flags(tx->sta, WLAN_STA_MFP)))) {
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		I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted);
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		return TX_DROP;
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	} else
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		tx->key = NULL;

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

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		tx->key->tx_rx_count++;
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		/* TODO: add threshold stuff again */
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		switch (tx->key->conf.alg) {
		case ALG_WEP:
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			if (ieee80211_is_auth(hdr->frame_control))
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				break;
		case ALG_TKIP:
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			if (!ieee80211_is_data_present(hdr->frame_control))
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				tx->key = NULL;
			break;
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		case ALG_CCMP:
			if (!ieee80211_is_data_present(hdr->frame_control) &&
			    !ieee80211_use_mfp(hdr->frame_control, tx->sta,
					       tx->skb))
				tx->key = NULL;
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			else
				skip_hw = (tx->key->conf.flags &
					   IEEE80211_KEY_FLAG_SW_MGMT) &&
					ieee80211_is_mgmt(hdr->frame_control);
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			break;
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		case ALG_AES_CMAC:
			if (!ieee80211_is_mgmt(hdr->frame_control))
				tx->key = NULL;
			break;
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		}
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		if (!skip_hw && tx->key &&
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		    tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
563
			info->control.hw_key = &tx->key->conf;
564 565
	}

566
	return TX_CONTINUE;
567 568
}

569 570 571 572 573
static ieee80211_tx_result debug_noinline
ieee80211_tx_h_sta(struct ieee80211_tx_data *tx)
{
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);

574
	if (tx->sta && tx->sta->uploaded)
575 576 577 578 579
		info->control.sta = &tx->sta->sta;

	return TX_CONTINUE;
}

580
static ieee80211_tx_result debug_noinline
581
ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
582
{
583
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
584 585 586 587 588 589
	struct ieee80211_hdr *hdr = (void *)tx->skb->data;
	struct ieee80211_supported_band *sband;
	struct ieee80211_rate *rate;
	int i, len;
	bool inval = false, rts = false, short_preamble = false;
	struct ieee80211_tx_rate_control txrc;
590
	u32 sta_flags;
591

592
	memset(&txrc, 0, sizeof(txrc));
593

594
	sband = tx->local->hw.wiphy->bands[tx->channel->band];
595

596
	len = min_t(int, tx->skb->len + FCS_LEN,
597
			 tx->local->hw.wiphy->frag_threshold);
598 599 600 601 602 603 604

	/* 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;
605 606 607 608 609
	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;
610
	txrc.ap = tx->sdata->vif.type == NL80211_IFTYPE_AP;
611 612

	/* set up RTS protection if desired */
613
	if (len > tx->local->hw.wiphy->rts_threshold) {
614
		txrc.rts = rts = true;
615 616
	}

617 618 619 620 621 622 623 624 625 626
	/*
	 * 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;
627

628 629 630 631 632 633
	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.
	 */
634
	if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) &&
635 636 637 638 639
		 (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",
640
		 tx->sdata->name, hdr->addr1,
641 642
		 tx->channel->band ? 5 : 2))
		return TX_DROP;
643

644 645 646 647
	/*
	 * If we're associated with the sta at this point we know we can at
	 * least send the frame at the lowest bit rate.
	 */
648 649 650 651 652 653 654
	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];
655

656
	if (tx->sta)
657
		tx->sta->last_tx_rate = txrc.reported_rate;
658

659 660
	if (unlikely(!info->control.rates[0].count))
		info->control.rates[0].count = 1;
661

662 663 664 665
	if (WARN_ON_ONCE((info->control.rates[0].count > 1) &&
			 (info->flags & IEEE80211_TX_CTL_NO_ACK)))
		info->control.rates[0].count = 1;

666 667 668 669 670
	if (is_multicast_ether_addr(hdr->addr1)) {
		/*
		 * XXX: verify the rate is in the basic rateset
		 */
		return TX_CONTINUE;
671 672
	}

673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697
	/*
	 * 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;
698 699
	}

700 701 702 703 704 705 706 707 708 709 710 711 712 713
	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;
		}
714

715 716 717 718 719 720 721 722
		/*
		 * 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;
		}
723

724 725 726 727
		/* set up RTS protection if desired */
		if (rts)
			info->control.rates[i].flags |=
				IEEE80211_TX_RC_USE_RTS_CTS;
728

729
		/* RC is busted */
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		if (WARN_ON_ONCE(info->control.rates[i].idx >=
				 sband->n_bitrates)) {
732 733
			info->control.rates[i].idx = -1;
			continue;
734
		}
735

736 737 738 739 740 741 742 743 744 745 746 747 748
		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;
749 750
	}

751 752 753
	return TX_CONTINUE;
}

754 755 756 757 758 759 760 761 762
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;

763 764 765 766 767
	/*
	 * 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.
	 */
768
	if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR))
769 770
		return TX_CONTINUE;

771 772 773 774 775 776
	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.
	 */
782
	if (!ieee80211_is_data_qos(hdr->frame_control)) {
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		/* driver should assign sequence number */
784
		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;
788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812
		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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813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857
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;
}

858
static ieee80211_tx_result debug_noinline
859 860
ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
{
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861 862 863
	struct sk_buff *skb = tx->skb;
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
	struct ieee80211_hdr *hdr = (void *)skb->data;
864
	int frag_threshold = tx->local->hw.wiphy->frag_threshold;
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865 866
	int hdrlen;
	int fragnum;
867 868 869 870

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

871 872
	/*
	 * Warn when submitting a fragmented A-MPDU frame and drop it.
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873
	 * This scenario is handled in ieee80211_tx_prepare but extra
874
	 * caution taken here as fragmented ampdu may cause Tx stop.
875
	 */
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876
	if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
877 878
		return TX_DROP;

879
	hdrlen = ieee80211_hdrlen(hdr->frame_control);
880

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881
	/* internal error, why is TX_FRAGMENTED set? */
882
	if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))
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883
		return TX_DROP;
884

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885 886 887 888 889 890 891 892 893 894
	/*
	 * 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;
895

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896 897 898 899 900
	/* update duration/seq/flags of fragments */
	fragnum = 0;
	do {
		int next_len;
		const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
901

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902 903
		hdr = (void *)skb->data;
		info = IEEE80211_SKB_CB(skb);
904

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905 906 907
		if (skb->next) {
			hdr->frame_control |= morefrags;
			next_len = skb->next->len;
908 909 910 911 912 913 914 915 916 917
			/*
			 * 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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918 919 920
		} else {
			hdr->frame_control &= ~morefrags;
			next_len = 0;
921
		}
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922 923 924 925
		hdr->duration_id = ieee80211_duration(tx, 0, next_len);
		hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG);
		fragnum++;
	} while ((skb = skb->next));
926

927
	return TX_CONTINUE;
928 929
}

930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946
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;
}

947
static ieee80211_tx_result debug_noinline
948 949 950 951 952 953 954 955 956 957 958 959
ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
{
	if (!tx->key)
		return TX_CONTINUE;

	switch (tx->key->conf.alg) {
	case ALG_WEP:
		return ieee80211_crypto_wep_encrypt(tx);
	case ALG_TKIP:
		return ieee80211_crypto_tkip_encrypt(tx);
	case ALG_CCMP:
		return ieee80211_crypto_ccmp_encrypt(tx);
960 961
	case ALG_AES_CMAC:
		return ieee80211_crypto_aes_cmac_encrypt(tx);
962 963 964 965 966 967 968
	}

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

969
static ieee80211_tx_result debug_noinline
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970 971
ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
{
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972 973 974 975
	struct sk_buff *skb = tx->skb;
	struct ieee80211_hdr *hdr;
	int next_len;
	bool group_addr;
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976

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977 978
	do {
		hdr = (void *) skb->data;
979 980
		if (unlikely(ieee80211_is_pspoll(hdr->frame_control)))
			break; /* must not overwrite AID */
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981 982
		next_len = skb->next ? skb->next->len : 0;
		group_addr = is_multicast_ether_addr(hdr->addr1);
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984 985 986
		hdr->duration_id =
			ieee80211_duration(tx, group_addr, next_len);
	} while ((skb = skb->next));
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987 988 989 990

	return TX_CONTINUE;
}

991 992 993 994 995 996
/* actual transmit path */

/*
 * deal with packet injection down monitor interface
 * with Radiotap Header -- only called for monitor mode interface
 */
997 998
static bool __ieee80211_parse_tx_radiotap(struct ieee80211_tx_data *tx,
					  struct sk_buff *skb)
999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010
{
	/*
	 * 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;
1011
	struct ieee80211_supported_band *sband;
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	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
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1013 1014
	int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len,
						   NULL);
1015

1016
	sband = tx->local->hw.wiphy->bands[tx->channel->band];
1017

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	info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1019
	tx->flags &= ~IEEE80211_TX_FRAGMENTED;
1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049

	/*
	 * 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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1050
				if (skb->len < (iterator._max_length + FCS_LEN))
1051
					return false;
1052 1053 1054

				skb_trim(skb, skb->len - FCS_LEN);
			}
1055
			if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
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				info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT;
1057
			if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
1058
				tx->flags |= IEEE80211_TX_FRAGMENTED;
1059 1060
			break;

1061 1062 1063 1064 1065 1066
		/*
		 * Please update the file
		 * Documentation/networking/mac80211-injection.txt
		 * when parsing new fields here.
		 */

1067 1068 1069 1070 1071 1072
		default:
			break;
		}
	}

	if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
1073
		return false;
1074 1075 1076

	/*
	 * remove the radiotap header
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	 * iterator->_max_length was sanity-checked against
1078 1079
	 * skb->len by iterator init
	 */
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	skb_pull(skb, iterator._max_length);
1081

1082
	return true;
1083 1084
}

1085 1086 1087
/*
 * initialises @tx
 */
1088
static ieee80211_tx_result
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ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
		     struct ieee80211_tx_data *tx,
		     struct sk_buff *skb)
1092
{
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	struct ieee80211_local *local = sdata->local;
1094
	struct ieee80211_hdr *hdr;
1095
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
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	int hdrlen, tid;
	u8 *qc, *state;
1098
	bool queued = false;
1099 1100 1101 1102

	memset(tx, 0, sizeof(*tx));
	tx->skb = skb;
	tx->local = local;
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	tx->sdata = sdata;
1104
	tx->channel = local->hw.conf.channel;
1105
	/*
1106 1107
	 * Set this flag (used below to indicate "automatic fragmentation"),
	 * it will be cleared/left by radiotap as desired.
1108
	 */
1109
	tx->flags |= IEEE80211_TX_FRAGMENTED;
1110 1111

	/* process and remove the injection radiotap header */
1112
	if (unlikely(info->flags & IEEE80211_TX_INTFL_HAS_RADIOTAP)) {
1113
		if (!__ieee80211_parse_tx_radiotap(tx, skb))
1114
			return TX_DROP;
1115

1116
		/*
1117 1118 1119
		 * __ieee80211_parse_tx_radiotap has now removed
		 * the radiotap header that was present and pre-filled
		 * 'tx' with tx control information.
1120
		 */
1121
		info->flags &= ~IEEE80211_TX_INTFL_HAS_RADIOTAP;
1122 1123
	}

1124 1125 1126 1127 1128 1129 1130
	/*
	 * 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;

1131 1132
	hdr = (struct ieee80211_hdr *) skb->data;

1133
	if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1134
		tx->sta = rcu_dereference(sdata->u.vlan.sta);
1135 1136
		if (!tx->sta && sdata->dev->ieee80211_ptr->use_4addr)
			return TX_DROP;
1137 1138
	} else if (info->flags & IEEE80211_TX_CTL_INJECTED) {
		tx->sta = sta_info_get_bss(sdata, hdr->addr1);
1139
	}
1140
	if (!tx->sta)
1141
		tx->sta = sta_info_get(sdata, hdr->addr1);
1142

1143 1144
	if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) &&
	    (local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION)) {
1145
		unsigned long flags;
1146 1147
		struct tid_ampdu_tx *tid_tx;

S
Sujith 已提交
1148 1149 1150
		qc = ieee80211_get_qos_ctl(hdr);
		tid = *qc & IEEE80211_QOS_CTL_TID_MASK;

1151
		spin_lock_irqsave(&tx->sta->lock, flags);
1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165
		/*
		 * XXX: This spinlock could be fairly expensive, but see the
		 *	comment in agg-tx.c:ieee80211_agg_tx_operational().
		 *	One way to solve this would be to do something RCU-like
		 *	for managing the tid_tx struct and using atomic bitops
		 *	for the actual state -- by introducing an actual
		 *	'operational' bit that would be possible. It would
		 *	require changing ieee80211_agg_tx_operational() to
		 *	set that bit, and changing the way tid_tx is managed
		 *	everywhere, including races between that bit and
		 *	tid_tx going away (tid_tx being added can be easily
		 *	committed to memory before the 'operational' bit).
		 */
		tid_tx = tx->sta->ampdu_mlme.tid_tx[tid];
S
Sujith 已提交
1166
		state = &tx->sta->ampdu_mlme.tid_state_tx[tid];
1167
		if (*state == HT_AGG_STATE_OPERATIONAL) {
S
Sujith 已提交
1168
			info->flags |= IEEE80211_TX_CTL_AMPDU;
1169 1170 1171
		} else if (*state != HT_AGG_STATE_IDLE) {
			/* in progress */
			queued = true;
1172
			info->control.vif = &sdata->vif;
1173 1174 1175
			info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
			__skb_queue_tail(&tid_tx->pending, skb);
		}
1176
		spin_unlock_irqrestore(&tx->sta->lock, flags);
1177 1178 1179

		if (unlikely(queued))
			return TX_QUEUED;
S
Sujith 已提交
1180 1181
	}

1182
	if (is_multicast_ether_addr(hdr->addr1)) {
1183
		tx->flags &= ~IEEE80211_TX_UNICAST;
1184
		info->flags |= IEEE80211_TX_CTL_NO_ACK;
1185
	} else {
1186
		tx->flags |= IEEE80211_TX_UNICAST;
1187 1188 1189 1190
		if (unlikely(local->wifi_wme_noack_test))
			info->flags |= IEEE80211_TX_CTL_NO_ACK;
		else
			info->flags &= ~IEEE80211_TX_CTL_NO_ACK;
1191
	}
1192

1193 1194
	if (tx->flags & IEEE80211_TX_FRAGMENTED) {
		if ((tx->flags & IEEE80211_TX_UNICAST) &&
1195
		    skb->len + FCS_LEN > local->hw.wiphy->frag_threshold &&
1196
		    !(info->flags & IEEE80211_TX_CTL_AMPDU))
1197
			tx->flags |= IEEE80211_TX_FRAGMENTED;
1198
		else
1199
			tx->flags &= ~IEEE80211_TX_FRAGMENTED;
1200 1201
	}

1202
	if (!tx->sta)
1203
		info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1204
	else if (test_and_clear_sta_flags(tx->sta, WLAN_STA_CLEAR_PS_FILT))
1205
		info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1206

1207
	hdrlen = ieee80211_hdrlen(hdr->frame_control);
1208 1209 1210 1211
	if (skb->len > hdrlen + sizeof(rfc1042_header) + 2) {
		u8 *pos = &skb->data[hdrlen + sizeof(rfc1042_header)];
		tx->ethertype = (pos[0] << 8) | pos[1];
	}
1212
	info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
1213

1214
	return TX_CONTINUE;
1215 1216
}

J
Johannes Berg 已提交
1217
static int __ieee80211_tx(struct ieee80211_local *local,
1218
			  struct sk_buff **skbp,
J
Johannes Berg 已提交
1219 1220
			  struct sta_info *sta,
			  bool txpending)
1221
{
1222
	struct sk_buff *skb = *skbp, *next;
1223
	struct ieee80211_tx_info *info;
1224
	struct ieee80211_sub_if_data *sdata;
J
Johannes Berg 已提交
1225
	unsigned long flags;
1226
	int ret, len;
J
Johannes Berg 已提交
1227
	bool fragm = false;
1228

J
Johannes Berg 已提交
1229
	while (skb) {
J
Johannes Berg 已提交
1230 1231 1232 1233 1234 1235 1236 1237 1238 1239
		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;
1240

1241 1242 1243
		info = IEEE80211_SKB_CB(skb);

		if (fragm)
1244
			info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT |
1245
					 IEEE80211_TX_CTL_FIRST_FRAGMENT);
1246

J
Johannes Berg 已提交
1247
		next = skb->next;
1248
		len = skb->len;
1249

J
Johannes Berg 已提交
1250 1251 1252
		if (next)
			info->flags |= IEEE80211_TX_CTL_MORE_FRAMES;

1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267
		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;
		}

1268
		ret = drv_tx(local, skb);
1269 1270 1271 1272
		if (WARN_ON(ret != NETDEV_TX_OK && skb->len != len)) {
			dev_kfree_skb(skb);
			ret = NETDEV_TX_OK;
		}
1273 1274
		if (ret != NETDEV_TX_OK) {
			info->control.vif = &sdata->vif;
J
Johannes Berg 已提交
1275
			return IEEE80211_TX_AGAIN;
1276 1277
		}

1278
		*skbp = skb = next;
J
Johannes Berg 已提交
1279 1280
		ieee80211_led_tx(local, 1);
		fragm = true;
1281
	}
J
Johannes Berg 已提交
1282

1283 1284 1285
	return IEEE80211_TX_OK;
}

1286 1287 1288 1289 1290 1291 1292
/*
 * 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;
1293
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1294 1295
	ieee80211_tx_result res = TX_DROP;

1296 1297 1298 1299 1300 1301 1302
#define CALL_TXH(txh) \
	do {				\
		res = txh(tx);		\
		if (res != TX_CONTINUE)	\
			goto txh_done;	\
	} while (0)

1303
	CALL_TXH(ieee80211_tx_h_dynamic_ps);
1304 1305 1306
	CALL_TXH(ieee80211_tx_h_check_assoc);
	CALL_TXH(ieee80211_tx_h_ps_buf);
	CALL_TXH(ieee80211_tx_h_select_key);
1307
	CALL_TXH(ieee80211_tx_h_sta);
1308 1309
	if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
		CALL_TXH(ieee80211_tx_h_rate_ctrl);
1310 1311 1312 1313 1314

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

	CALL_TXH(ieee80211_tx_h_michael_mic_add);
1315 1316
	CALL_TXH(ieee80211_tx_h_sequence);
	CALL_TXH(ieee80211_tx_h_fragment);
1317
	/* handlers after fragment must be aware of tx info fragmentation! */
1318 1319 1320
	CALL_TXH(ieee80211_tx_h_stats);
	CALL_TXH(ieee80211_tx_h_encrypt);
	CALL_TXH(ieee80211_tx_h_calculate_duration);
1321
#undef CALL_TXH
1322

1323
 txh_done:
1324
	if (unlikely(res == TX_DROP)) {
1325
		I802_DEBUG_INC(tx->local->tx_handlers_drop);
J
Johannes Berg 已提交
1326 1327 1328 1329 1330 1331 1332
		while (skb) {
			struct sk_buff *next;

			next = skb->next;
			dev_kfree_skb(skb);
			skb = next;
		}
1333 1334
		return -1;
	} else if (unlikely(res == TX_QUEUED)) {
1335
		I802_DEBUG_INC(tx->local->tx_handlers_queued);
1336 1337 1338 1339 1340 1341
		return -1;
	}

	return 0;
}

J
Johannes Berg 已提交
1342 1343
static void ieee80211_tx(struct ieee80211_sub_if_data *sdata,
			 struct sk_buff *skb, bool txpending)
1344
{
J
Johannes Berg 已提交
1345
	struct ieee80211_local *local = sdata->local;
1346
	struct ieee80211_tx_data tx;
1347
	ieee80211_tx_result res_prepare;
1348
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1349 1350 1351
	struct sk_buff *next;
	unsigned long flags;
	int ret, retries;
1352
	u16 queue;
1353

1354 1355
	queue = skb_get_queue_mapping(skb);

1356 1357
	if (unlikely(skb->len < 10)) {
		dev_kfree_skb(skb);
1358
		return;
1359 1360
	}

1361 1362
	rcu_read_lock();

1363
	/* initialises tx */
J
Johannes Berg 已提交
1364
	res_prepare = ieee80211_tx_prepare(sdata, &tx, skb);
1365

1366
	if (unlikely(res_prepare == TX_DROP)) {
1367
		dev_kfree_skb(skb);
1368
		rcu_read_unlock();
1369 1370 1371 1372
		return;
	} else if (unlikely(res_prepare == TX_QUEUED)) {
		rcu_read_unlock();
		return;
1373 1374
	}

1375
	tx.channel = local->hw.conf.channel;
1376
	info->band = tx.channel->band;
1377

1378 1379
	if (invoke_tx_handlers(&tx))
		goto out;
1380

1381 1382
	retries = 0;
 retry:
J
Johannes Berg 已提交
1383
	ret = __ieee80211_tx(local, &tx.skb, tx.sta, txpending);
1384 1385 1386 1387
	switch (ret) {
	case IEEE80211_TX_OK:
		break;
	case IEEE80211_TX_AGAIN:
1388 1389 1390 1391 1392
		/*
		 * 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.
		 */
1393 1394 1395 1396 1397
		if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
			goto drop;
		/* fall through */
	case IEEE80211_TX_PENDING:
		skb = tx.skb;
1398

1399
		spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1400

J
Johannes Berg 已提交
1401 1402 1403 1404 1405 1406
		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
			 */
1407 1408 1409
			do {
				next = skb->next;
				skb->next = NULL;
1410
				if (unlikely(txpending))
J
Johannes Berg 已提交
1411 1412
					__skb_queue_head(&local->pending[queue],
							 skb);
1413
				else
J
Johannes Berg 已提交
1414 1415
					__skb_queue_tail(&local->pending[queue],
							 skb);
1416 1417 1418 1419 1420
			} while ((skb = next));

			spin_unlock_irqrestore(&local->queue_stop_reason_lock,
					       flags);
		} else {
J
Johannes Berg 已提交
1421 1422 1423 1424
			/*
			 * otherwise retry, but this is a race condition or
			 * a driver bug (which we warn about if it persists)
			 */
1425 1426 1427 1428
			spin_unlock_irqrestore(&local->queue_stop_reason_lock,
					       flags);

			retries++;
J
Johannes Berg 已提交
1429
			if (WARN(retries > 10, "tx refused but queue active\n"))
1430
				goto drop;
1431 1432 1433
			goto retry;
		}
	}
1434
 out:
1435
	rcu_read_unlock();
1436
	return;
1437 1438

 drop:
1439
	rcu_read_unlock();
J
Johannes Berg 已提交
1440 1441 1442 1443 1444 1445 1446

	skb = tx.skb;
	while (skb) {
		next = skb->next;
		dev_kfree_skb(skb);
		skb = next;
	}
1447 1448 1449 1450
}

/* device xmit handlers */

1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489
static int ieee80211_skb_resize(struct ieee80211_local *local,
				struct sk_buff *skb,
				int head_need, bool may_encrypt)
{
	int tail_need = 0;

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

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

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

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

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

	return 0;
}

J
Johannes Berg 已提交
1490 1491
static void ieee80211_xmit(struct ieee80211_sub_if_data *sdata,
			   struct sk_buff *skb)
1492
{
J
Johannes Berg 已提交
1493
	struct ieee80211_local *local = sdata->local;
1494
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1495
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
J
Johannes Berg 已提交
1496
	struct ieee80211_sub_if_data *tmp_sdata;
1497
	int headroom;
1498
	bool may_encrypt;
1499

1500 1501
	rcu_read_lock();

1502
	if (unlikely(sdata->vif.type == NL80211_IFTYPE_MONITOR)) {
1503 1504 1505
		int hdrlen;
		u16 len_rthdr;

1506 1507
		info->flags |= IEEE80211_TX_CTL_INJECTED |
			       IEEE80211_TX_INTFL_HAS_RADIOTAP;
1508 1509

		len_rthdr = ieee80211_get_radiotap_len(skb->data);
1510
		hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524
		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
1525
			list_for_each_entry_rcu(tmp_sdata, &local->interfaces,
1526
						list) {
1527
				if (!ieee80211_sdata_running(tmp_sdata))
1528
					continue;
J
Johannes Berg 已提交
1529
				if (tmp_sdata->vif.type != NL80211_IFTYPE_AP)
1530
					continue;
1531
				if (compare_ether_addr(tmp_sdata->vif.addr,
1532
						       hdr->addr2) == 0) {
J
Johannes Berg 已提交
1533
					sdata = tmp_sdata;
1534 1535 1536 1537
					break;
				}
			}
		}
1538 1539
	}

J
Johannes Berg 已提交
1540
	may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT);
1541

J
Johannes Berg 已提交
1542
	headroom = local->tx_headroom;
1543 1544 1545 1546 1547
	if (may_encrypt)
		headroom += IEEE80211_ENCRYPT_HEADROOM;
	headroom -= skb_headroom(skb);
	headroom = max_t(int, 0, headroom);

J
Johannes Berg 已提交
1548
	if (ieee80211_skb_resize(local, skb, headroom, may_encrypt)) {
1549
		dev_kfree_skb(skb);
1550
		rcu_read_unlock();
J
Johannes Berg 已提交
1551
		return;
1552 1553
	}

1554
	info->control.vif = &sdata->vif;
1555

1556 1557 1558 1559 1560
	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 */
1561
				rcu_read_unlock();
1562 1563 1564
				return;
			}

1565
	ieee80211_set_qos_hdr(local, skb);
J
Johannes Berg 已提交
1566
	ieee80211_tx(sdata, skb, false);
1567
	rcu_read_unlock();
1568 1569
}

1570 1571
netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
					 struct net_device *dev)
1572 1573
{
	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1574
	struct ieee80211_channel *chan = local->hw.conf.channel;
1575 1576
	struct ieee80211_radiotap_header *prthdr =
		(struct ieee80211_radiotap_header *)skb->data;
J
Johannes Berg 已提交
1577
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1578
	u16 len_rthdr;
1579

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

1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613
	/* 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 */
1614 1615 1616 1617 1618 1619 1620

	/*
	 * 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
	 */
1621
	skb_set_mac_header(skb, len_rthdr);
1622
	/*
1623 1624
	 * 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
1625
	 */
1626 1627
	skb_set_network_header(skb, len_rthdr);
	skb_set_transport_header(skb, len_rthdr);
1628

J
Johannes Berg 已提交
1629 1630
	memset(info, 0, sizeof(*info));

1631 1632
	info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;

J
Johannes Berg 已提交
1633 1634
	/* pass the radiotap header up to xmit */
	ieee80211_xmit(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1635
	return NETDEV_TX_OK;
1636 1637 1638 1639

fail:
	dev_kfree_skb(skb);
	return NETDEV_TX_OK; /* meaning, we dealt with the skb */
1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656
}

/**
 * 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).
 */
1657 1658
netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
				    struct net_device *dev)
1659
{
1660 1661
	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
	struct ieee80211_local *local = sdata->local;
J
Johannes Berg 已提交
1662
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1663
	int ret = NETDEV_TX_BUSY, head_need;
1664 1665
	u16 ethertype, hdrlen,  meshhdrlen = 0;
	__le16 fc;
1666
	struct ieee80211_hdr hdr;
1667
	struct ieee80211s_hdr mesh_hdr;
1668 1669
	const u8 *encaps_data;
	int encaps_len, skip_header_bytes;
1670
	int nh_pos, h_pos;
1671
	struct sta_info *sta = NULL;
1672
	u32 sta_flags = 0;
1673 1674

	if (unlikely(skb->len < ETH_HLEN)) {
1675
		ret = NETDEV_TX_OK;
1676 1677 1678 1679 1680 1681 1682 1683 1684
		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];
1685
	fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
1686

1687
	switch (sdata->vif.type) {
1688
	case NL80211_IFTYPE_AP_VLAN:
1689
		rcu_read_lock();
1690
		sta = rcu_dereference(sdata->u.vlan.sta);
1691 1692 1693 1694
		if (sta) {
			fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
			/* RA TA DA SA */
			memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN);
1695
			memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1696 1697 1698 1699 1700 1701 1702 1703 1704 1705
			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:
1706
		fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
1707 1708
		/* DA BSSID SA */
		memcpy(hdr.addr1, skb->data, ETH_ALEN);
1709
		memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1710 1711
		memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
		hdrlen = 24;
1712
		break;
1713
	case NL80211_IFTYPE_WDS:
1714
		fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1715 1716
		/* RA TA DA SA */
		memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
1717
		memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1718 1719 1720
		memcpy(hdr.addr3, skb->data, ETH_ALEN);
		memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
		hdrlen = 30;
1721
		break;
1722
#ifdef CONFIG_MAC80211_MESH
1723
	case NL80211_IFTYPE_MESH_POINT:
1724
		if (!sdata->u.mesh.mshcfg.dot11MeshTTL) {
1725
			/* Do not send frames with mesh_ttl == 0 */
1726
			sdata->u.mesh.mshstats.dropped_frames_ttl++;
1727
			ret = NETDEV_TX_OK;
1728
			goto fail;
1729
		}
1730

1731 1732
		if (compare_ether_addr(sdata->vif.addr,
				       skb->data + ETH_ALEN) == 0) {
1733 1734 1735 1736
			hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
					skb->data, skb->data + ETH_ALEN);
			meshhdrlen = ieee80211_new_mesh_header(&mesh_hdr,
					sdata, NULL, NULL, NULL);
1737 1738 1739
		} else {
			/* packet from other interface */
			struct mesh_path *mppath;
1740
			int is_mesh_mcast = 1;
1741
			const u8 *mesh_da;
1742

1743
			rcu_read_lock();
1744
			if (is_multicast_ether_addr(skb->data))
1745 1746
				/* DA TA mSA AE:SA */
				mesh_da = skb->data;
1747
			else {
1748 1749 1750
				static const u8 bcast[ETH_ALEN] =
					{ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };

1751
				mppath = mpp_path_lookup(skb->data, sdata);
1752 1753 1754 1755
				if (mppath) {
					/* RA TA mDA mSA AE:DA SA */
					mesh_da = mppath->mpp;
					is_mesh_mcast = 0;
1756
				} else {
1757
					/* DA TA mSA AE:SA */
1758 1759
					mesh_da = bcast;
				}
1760
			}
1761
			hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
1762
					mesh_da, sdata->vif.addr);
1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777
			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);
1778 1779

		}
1780 1781
		break;
#endif
1782
	case NL80211_IFTYPE_STATION:
1783
		memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
1784
		if (sdata->u.mgd.use_4addr && ethertype != ETH_P_PAE) {
1785 1786
			fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
			/* RA TA DA SA */
1787
			memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1788 1789 1790 1791 1792 1793 1794 1795 1796 1797
			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;
		}
1798
		break;
1799
	case NL80211_IFTYPE_ADHOC:
1800 1801 1802
		/* DA SA BSSID */
		memcpy(hdr.addr1, skb->data, ETH_ALEN);
		memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1803
		memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN);
1804
		hdrlen = 24;
1805 1806
		break;
	default:
1807
		ret = NETDEV_TX_OK;
1808 1809 1810
		goto fail;
	}

1811 1812 1813 1814 1815 1816
	/*
	 * 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)) {
1817
		rcu_read_lock();
1818 1819
		sta = sta_info_get(sdata, hdr.addr1);
		if (sta)
1820
			sta_flags = get_sta_flags(sta);
1821
		rcu_read_unlock();
1822 1823
	}

1824
	/* receiver and we are QoS enabled, use a QoS type frame */
1825
	if ((sta_flags & WLAN_STA_WME) && local->hw.queues >= 4) {
1826
		fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
1827 1828 1829 1830
		hdrlen += 2;
	}

	/*
1831 1832
	 * Drop unicast frames to unauthorised stations unless they are
	 * EAPOL frames from the local station.
1833
	 */
1834 1835
	if (!ieee80211_vif_is_mesh(&sdata->vif) &&
		unlikely(!is_multicast_ether_addr(hdr.addr1) &&
1836 1837
		      !(sta_flags & WLAN_STA_AUTHORIZED) &&
		      !(ethertype == ETH_P_PAE &&
1838
		       compare_ether_addr(sdata->vif.addr,
1839 1840 1841
					  skb->data + ETH_ALEN) == 0))) {
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
		if (net_ratelimit())
1842
			printk(KERN_DEBUG "%s: dropped frame to %pM"
1843
			       " (unauthorized port)\n", dev->name,
1844
			       hdr.addr1);
1845 1846 1847 1848
#endif

		I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);

1849
		ret = NETDEV_TX_OK;
1850 1851 1852
		goto fail;
	}

1853
	hdr.frame_control = fc;
1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874
	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;

1875
	head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
1876

1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887
	/*
	 * 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.
	 */
1888

1889
	if (head_need > 0 || skb_cloned(skb)) {
1890 1891 1892 1893
		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))
1894 1895 1896 1897 1898 1899 1900 1901
			goto fail;
	}

	if (encaps_data) {
		memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
		nh_pos += encaps_len;
		h_pos += encaps_len;
	}
1902

1903 1904 1905 1906 1907 1908
	if (meshhdrlen > 0) {
		memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
		nh_pos += meshhdrlen;
		h_pos += meshhdrlen;
	}

1909
	if (ieee80211_is_data_qos(fc)) {
1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921
		__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);

1922 1923 1924
	nh_pos += hdrlen;
	h_pos += hdrlen;

1925 1926
	dev->stats.tx_packets++;
	dev->stats.tx_bytes += skb->len;
1927 1928 1929 1930 1931 1932 1933 1934

	/* 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
1935 1936
	memset(info, 0, sizeof(*info));

1937
	dev->trans_start = jiffies;
J
Johannes Berg 已提交
1938
	ieee80211_xmit(sdata, skb);
1939

1940
	return NETDEV_TX_OK;
1941 1942

 fail:
1943
	if (ret == NETDEV_TX_OK)
1944 1945 1946 1947 1948 1949
		dev_kfree_skb(skb);

	return ret;
}


1950 1951 1952 1953
/*
 * ieee80211_clear_tx_pending may not be called in a context where
 * it is possible that it packets could come in again.
 */
1954 1955
void ieee80211_clear_tx_pending(struct ieee80211_local *local)
{
J
Johannes Berg 已提交
1956
	int i;
1957

1958 1959
	for (i = 0; i < local->hw.queues; i++)
		skb_queue_purge(&local->pending[i]);
1960 1961
}

1962 1963 1964 1965 1966 1967 1968 1969 1970 1971
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;

1972
	sdata = vif_to_sdata(info->control.vif);
1973 1974

	if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) {
1975
		ieee80211_tx(sdata, skb, true);
1976 1977
	} else {
		hdr = (struct ieee80211_hdr *)skb->data;
1978
		sta = sta_info_get(sdata, hdr->addr1);
1979

J
Johannes Berg 已提交
1980
		ret = __ieee80211_tx(local, &skb, sta, true);
1981 1982 1983 1984 1985 1986 1987
		if (ret != IEEE80211_TX_OK)
			result = false;
	}

	return result;
}

1988
/*
J
Johannes Berg 已提交
1989
 * Transmit all pending packets. Called from tasklet.
1990
 */
1991 1992 1993
void ieee80211_tx_pending(unsigned long data)
{
	struct ieee80211_local *local = (struct ieee80211_local *)data;
1994
	unsigned long flags;
1995
	int i;
J
Johannes Berg 已提交
1996
	bool txok;
1997

1998
	rcu_read_lock();
1999

J
Johannes Berg 已提交
2000
	spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
2001 2002 2003 2004 2005
	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
2006
		if (local->queue_stop_reasons[i] ||
2007
		    skb_queue_empty(&local->pending[i]))
2008
			continue;
2009

2010
		while (!skb_queue_empty(&local->pending[i])) {
J
Johannes Berg 已提交
2011
			struct sk_buff *skb = __skb_dequeue(&local->pending[i]);
2012 2013 2014
			struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
			struct ieee80211_sub_if_data *sdata;

2015 2016 2017 2018 2019
			if (WARN_ON(!info->control.vif)) {
				kfree_skb(skb);
				continue;
			}

2020
			sdata = vif_to_sdata(info->control.vif);
J
Johannes Berg 已提交
2021 2022 2023 2024 2025 2026 2027 2028 2029
			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)
2030
				break;
2031 2032
		}
	}
J
Johannes Berg 已提交
2033
	spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
2034

2035
	rcu_read_unlock();
2036 2037 2038 2039
}

/* functions for drivers to get certain frames */

R
Rami Rosen 已提交
2040
static void ieee80211_beacon_add_tim(struct ieee80211_if_ap *bss,
2041 2042
				     struct sk_buff *skb,
				     struct beacon_data *beacon)
2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056
{
	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)
2057
		bss->dtim_count = beacon->dtim_period - 1;
2058 2059 2060 2061 2062 2063 2064
	else
		bss->dtim_count--;

	tim = pos = (u8 *) skb_put(skb, 6);
	*pos++ = WLAN_EID_TIM;
	*pos++ = 4;
	*pos++ = bss->dtim_count;
2065
	*pos++ = beacon->dtim_period;
2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077 2078 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101

	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 */
	}
}

2102 2103 2104
struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
					 struct ieee80211_vif *vif,
					 u16 *tim_offset, u16 *tim_length)
2105 2106
{
	struct ieee80211_local *local = hw_to_local(hw);
2107
	struct sk_buff *skb = NULL;
2108
	struct ieee80211_tx_info *info;
2109 2110
	struct ieee80211_sub_if_data *sdata = NULL;
	struct ieee80211_if_ap *ap = NULL;
2111
	struct beacon_data *beacon;
2112
	struct ieee80211_supported_band *sband;
2113
	enum ieee80211_band band = local->hw.conf.channel->band;
2114
	struct ieee80211_tx_rate_control txrc;
2115

2116
	sband = local->hw.wiphy->bands[band];
2117 2118

	rcu_read_lock();
2119

2120
	sdata = vif_to_sdata(vif);
2121

2122 2123 2124 2125 2126
	if (tim_offset)
		*tim_offset = 0;
	if (tim_length)
		*tim_length = 0;

2127
	if (sdata->vif.type == NL80211_IFTYPE_AP) {
2128 2129
		ap = &sdata->u.ap;
		beacon = rcu_dereference(ap->beacon);
J
Johannes Berg 已提交
2130 2131 2132 2133 2134 2135 2136 2137 2138 2139
		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;
2140

J
Johannes Berg 已提交
2141 2142 2143
			skb_reserve(skb, local->tx_headroom);
			memcpy(skb_put(skb, beacon->head_len), beacon->head,
			       beacon->head_len);
2144

2145 2146 2147 2148 2149 2150 2151 2152
			/*
			 * 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
2153
				ieee80211_beacon_add_tim(ap, skb, beacon);
2154 2155 2156 2157
			} else {
				unsigned long flags;

				spin_lock_irqsave(&local->sta_lock, flags);
R
Rami Rosen 已提交
2158
				ieee80211_beacon_add_tim(ap, skb, beacon);
2159 2160
				spin_unlock_irqrestore(&local->sta_lock, flags);
			}
2161

2162 2163 2164 2165 2166
			if (tim_offset)
				*tim_offset = beacon->head_len;
			if (tim_length)
				*tim_length = skb->len - beacon->head_len;

J
Johannes Berg 已提交
2167 2168 2169
			if (beacon->tail)
				memcpy(skb_put(skb, beacon->tail_len),
				       beacon->tail, beacon->tail_len);
2170 2171
		} else
			goto out;
2172
	} else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
2173
		struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
2174
		struct ieee80211_hdr *hdr;
2175
		struct sk_buff *presp = rcu_dereference(ifibss->presp);
2176

2177
		if (!presp)
2178 2179
			goto out;

2180
		skb = skb_copy(presp, GFP_ATOMIC);
2181 2182 2183 2184
		if (!skb)
			goto out;

		hdr = (struct ieee80211_hdr *) skb->data;
2185 2186
		hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
						 IEEE80211_STYPE_BEACON);
J
Johannes Berg 已提交
2187
	} else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2188 2189 2190
		struct ieee80211_mgmt *mgmt;
		u8 *pos;

J
Johannes Berg 已提交
2191 2192 2193 2194 2195 2196 2197 2198 2199
		/* 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));
2200 2201
		mgmt->frame_control =
		    cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_BEACON);
J
Johannes Berg 已提交
2202
		memset(mgmt->da, 0xff, ETH_ALEN);
2203 2204
		memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
		memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
J
Johannes Berg 已提交
2205
		mgmt->u.beacon.beacon_int =
2206
			cpu_to_le16(sdata->vif.bss_conf.beacon_int);
J
Johannes Berg 已提交
2207 2208 2209 2210 2211 2212
		mgmt->u.beacon.capab_info = 0x0; /* 0x0 for MPs */

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

2213
		mesh_mgmt_ies_add(skb, sdata);
2214 2215
	} else {
		WARN_ON(1);
2216
		goto out;
2217 2218
	}

2219 2220
	info = IEEE80211_SKB_CB(skb);

J
Johannes Berg 已提交
2221
	info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
2222
	info->flags |= IEEE80211_TX_CTL_NO_ACK;
2223
	info->band = band;
2224 2225 2226 2227 2228 2229 2230

	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;
2231 2232 2233 2234 2235
	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;
2236 2237
	txrc.ap = true;
	rate_control_get_rate(sdata, NULL, &txrc);
2238 2239

	info->control.vif = vif;
2240 2241 2242

	info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
	info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
2243
 out:
2244
	rcu_read_unlock();
2245 2246
	return skb;
}
2247
EXPORT_SYMBOL(ieee80211_beacon_get_tim);
2248

2249 2250 2251 2252 2253 2254 2255 2256 2257 2258 2259 2260 2261 2262 2263 2264 2265 2266 2267 2268 2269 2270 2271 2272 2273 2274 2275 2276 2277 2278 2279 2280 2281 2282 2283 2284 2285 2286 2287 2288 2289 2290 2291 2292 2293 2294 2295 2296 2297 2298 2299 2300 2301 2302 2303 2304 2305 2306 2307 2308 2309 2310 2311 2312 2313 2314 2315 2316 2317 2318 2319 2320 2321 2322 2323 2324 2325 2326
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);

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
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);

2377
void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
2378
		       const void *frame, size_t frame_len,
2379
		       const struct ieee80211_tx_info *frame_txctl,
2380 2381 2382 2383
		       struct ieee80211_rts *rts)
{
	const struct ieee80211_hdr *hdr = frame;

2384 2385
	rts->frame_control =
	    cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
2386 2387
	rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
					       frame_txctl);
2388 2389 2390 2391 2392
	memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
	memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
}
EXPORT_SYMBOL(ieee80211_rts_get);

2393
void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
2394
			     const void *frame, size_t frame_len,
2395
			     const struct ieee80211_tx_info *frame_txctl,
2396 2397 2398 2399
			     struct ieee80211_cts *cts)
{
	const struct ieee80211_hdr *hdr = frame;

2400 2401
	cts->frame_control =
	    cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
2402 2403
	cts->duration = ieee80211_ctstoself_duration(hw, vif,
						     frame_len, frame_txctl);
2404 2405 2406 2407 2408
	memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
}
EXPORT_SYMBOL(ieee80211_ctstoself_get);

struct sk_buff *
2409
ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
2410
			  struct ieee80211_vif *vif)
2411 2412
{
	struct ieee80211_local *local = hw_to_local(hw);
2413
	struct sk_buff *skb = NULL;
2414
	struct sta_info *sta;
2415
	struct ieee80211_tx_data tx;
2416 2417
	struct ieee80211_sub_if_data *sdata;
	struct ieee80211_if_ap *bss = NULL;
2418
	struct beacon_data *beacon;
2419
	struct ieee80211_tx_info *info;
2420

2421
	sdata = vif_to_sdata(vif);
2422
	bss = &sdata->u.ap;
2423 2424 2425 2426

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

2427
	if (sdata->vif.type != NL80211_IFTYPE_AP || !beacon || !beacon->head)
2428
		goto out;
2429

2430
	if (bss->dtim_count != 0)
2431
		goto out; /* send buffered bc/mc only after DTIM beacon */
2432

2433 2434 2435
	while (1) {
		skb = skb_dequeue(&bss->ps_bc_buf);
		if (!skb)
2436
			goto out;
2437 2438 2439 2440 2441 2442 2443 2444 2445 2446 2447 2448
		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
2449
		if (!ieee80211_tx_prepare(sdata, &tx, skb))
2450 2451 2452
			break;
		dev_kfree_skb_any(skb);
	}
2453 2454 2455

	info = IEEE80211_SKB_CB(skb);

2456
	sta = tx.sta;
2457 2458
	tx.flags |= IEEE80211_TX_PS_BUFFERED;
	tx.channel = local->hw.conf.channel;
2459
	info->band = tx.channel->band;
2460

2461
	if (invoke_tx_handlers(&tx))
2462
		skb = NULL;
2463
 out:
2464
	rcu_read_unlock();
2465 2466 2467 2468

	return skb;
}
EXPORT_SYMBOL(ieee80211_get_buffered_bc);
J
Johannes Berg 已提交
2469

2470
void ieee80211_tx_skb(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
J
Johannes Berg 已提交
2471 2472 2473 2474 2475
{
	skb_set_mac_header(skb, 0);
	skb_set_network_header(skb, 0);
	skb_set_transport_header(skb, 0);

2476 2477 2478
	/* send all internal mgmt frames on VO */
	skb_set_queue_mapping(skb, 0);

2479 2480 2481 2482 2483 2484
	/*
	 * 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
2485
	ieee80211_xmit(sdata, skb);
2486
	local_bh_enable();
J
Johannes Berg 已提交
2487
}