tx.c 74.3 KB
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/*
 * Copyright 2002-2005, Instant802 Networks, Inc.
 * Copyright 2005-2006, Devicescape Software, Inc.
 * Copyright 2006-2007	Jiri Benc <jbenc@suse.cz>
 * Copyright 2007	Johannes Berg <johannes@sipsolutions.net>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 *
 * Transmit and frame generation functions.
 */

#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/skbuff.h>
#include <linux/etherdevice.h>
#include <linux/bitmap.h>
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#include <linux/rcupdate.h>
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#include <linux/export.h>
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#include <net/net_namespace.h>
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#include <net/ieee80211_radiotap.h>
#include <net/cfg80211.h>
#include <net/mac80211.h>
#include <asm/unaligned.h>

#include "ieee80211_i.h"
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#include "driver-ops.h"
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#include "led.h"
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#include "mesh.h"
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#include "wep.h"
#include "wpa.h"
#include "wme.h"
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#include "rate.h"
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/* misc utils */

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static __le16 ieee80211_duration(struct ieee80211_tx_data *tx,
				 struct sk_buff *skb, int group_addr,
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				 int next_frag_len)
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{
	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(skb);
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	/* 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 *)skb->data;
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	if (ieee80211_is_ctl(hdr->frame_control)) {
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		/* TODO: These control frames are not currently sent by
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		 * mac80211, but should they be implemented, this function
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		 * needs to be updated to support duration field calculation.
		 *
		 * RTS: time needed to transmit pending data/mgmt frame plus
		 *    one CTS frame plus one ACK frame plus 3 x SIFS
		 * CTS: duration of immediately previous RTS minus time
		 *    required to transmit CTS and its SIFS
		 * ACK: 0 if immediately previous directed data/mgmt had
		 *    more=0, with more=1 duration in ACK frame is duration
		 *    from previous frame minus time needed to transmit ACK
		 *    and its SIFS
		 * PS Poll: BIT(15) | BIT(14) | aid
		 */
		return 0;
	}

	/* data/mgmt */
	if (0 /* FIX: data/mgmt during CFP */)
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		return cpu_to_le16(32768);
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	if (group_addr) /* Group address as the destination - no ACK */
		return 0;

	/* Individual destination address:
	 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
	 * CTS and ACK frames shall be transmitted using the highest rate in
	 * basic rate set that is less than or equal to the rate of the
	 * immediately previous frame and that is using the same modulation
	 * (CCK or OFDM). If no basic rate set matches with these requirements,
	 * the highest mandatory rate of the PHY that is less than or equal to
	 * the rate of the previous frame is used.
	 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
	 */
	rate = -1;
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	/* use lowest available if everything fails */
	mrate = sband->bitrates[0].bitrate;
	for (i = 0; i < sband->n_bitrates; i++) {
		struct ieee80211_rate *r = &sband->bitrates[i];
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		if (r->bitrate > txrate->bitrate)
			break;
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		if (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 inline int is_ieee80211_device(struct ieee80211_local *local,
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				      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);
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		ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
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		ieee80211_queue_work(&local->hw,
				     &local->dynamic_ps_disable_work);
	}

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	/* Don't restart the timer if we're not disassociated */
	if (!ifmgd->associated)
		return TX_CONTINUE;

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	mod_timer(&local->dynamic_ps_timer, jiffies +
		  msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));

	return TX_CONTINUE;
}
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static ieee80211_tx_result debug_noinline
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ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx)
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{
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	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
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	bool assoc = false;
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	if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED))
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		return TX_CONTINUE;
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	if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) &&
	    test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) &&
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	    !ieee80211_is_probe_req(hdr->frame_control) &&
	    !ieee80211_is_nullfunc(hdr->frame_control))
		/*
		 * When software scanning only nullfunc frames (to notify
		 * the sleep state to the AP) and probe requests (for the
		 * active scan) are allowed, all other frames should not be
		 * sent and we should not get here, but if we do
		 * nonetheless, drop them to avoid sending them
		 * off-channel. See the link below and
		 * ieee80211_start_scan() for more.
		 *
		 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089
		 */
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		return TX_DROP;
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	if (tx->sdata->vif.type == NL80211_IFTYPE_WDS)
		return TX_CONTINUE;

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

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	if (tx->flags & IEEE80211_TX_PS_BUFFERED)
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		return TX_CONTINUE;
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	if (tx->sta)
		assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
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	if (likely(tx->flags & IEEE80211_TX_UNICAST)) {
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		if (unlikely(!assoc &&
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			     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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	/*
	 * Drop one frame from each station from the lowest-priority
	 * AC that has frames at all.
	 */
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	list_for_each_entry_rcu(sta, &local->sta_list, list) {
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		int ac;

		for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) {
			skb = skb_dequeue(&sta->ps_tx_buf[ac]);
			total += skb_queue_len(&sta->ps_tx_buf[ac]);
			if (skb) {
				purged++;
				dev_kfree_skb(skb);
				break;
			}
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		}
	}
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	rcu_read_unlock();
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	local->total_ps_buffered = total;
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#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
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	wiphy_debug(local->hw.wiphy, "PS buffers full - purged %d frames\n",
		    purged);
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#endif
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}

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

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

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

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

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

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

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

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

	return 1;
}

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static ieee80211_tx_result
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ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx)
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{
	struct sta_info *sta = tx->sta;
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	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
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	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
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	struct ieee80211_local *local = tx->local;
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	if (unlikely(!sta ||
		     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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	if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) ||
		      test_sta_flag(sta, WLAN_STA_PS_DRIVER)) &&
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		     !(info->flags & IEEE80211_TX_CTL_POLL_RESPONSE))) {
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		int ac = skb_get_queue_mapping(tx->skb);

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#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
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		printk(KERN_DEBUG "STA %pM aid %d: PS buffer for AC %d\n",
		       sta->sta.addr, sta->sta.aid, ac);
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#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
		if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
			purge_old_ps_buffers(tx->local);
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		if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) {
			struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]);
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#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
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			if (net_ratelimit())
				printk(KERN_DEBUG "%s: STA %pM TX buffer for "
				       "AC %d full - dropping oldest frame\n",
				       tx->sdata->name, sta->sta.addr, ac);
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#endif
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			dev_kfree_skb(old);
		} else
			tx->local->total_ps_buffered++;
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		info->control.jiffies = jiffies;
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		info->control.vif = &tx->sdata->vif;
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		info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
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		skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb);
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		if (!timer_pending(&local->sta_cleanup))
			mod_timer(&local->sta_cleanup,
				  round_jiffies(jiffies +
						STA_INFO_CLEANUP_INTERVAL));

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		/*
		 * We queued up some frames, so the TIM bit might
		 * need to be set, recalculate it.
		 */
		sta_info_recalc_tim(sta);

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

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	return TX_CONTINUE;
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}

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

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static ieee80211_tx_result debug_noinline
ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx)
{
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);

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

	return TX_CONTINUE;
}

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static ieee80211_tx_result debug_noinline
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ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
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{
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	struct ieee80211_key *key = NULL;
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	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
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	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
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	if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT))
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		tx->key = NULL;
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	else if (tx->sta && (key = rcu_dereference(tx->sta->ptk)))
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		tx->key = key;
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	else if (ieee80211_is_mgmt(hdr->frame_control) &&
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		 is_multicast_ether_addr(hdr->addr1) &&
		 ieee80211_is_robust_mgmt_frame(hdr) &&
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		 (key = rcu_dereference(tx->sdata->default_mgmt_key)))
		tx->key = key;
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	else if (is_multicast_ether_addr(hdr->addr1) &&
		 (key = rcu_dereference(tx->sdata->default_multicast_key)))
		tx->key = key;
	else if (!is_multicast_ether_addr(hdr->addr1) &&
		 (key = rcu_dereference(tx->sdata->default_unicast_key)))
555
		tx->key = key;
556
	else if (tx->sdata->drop_unencrypted &&
557
		 (tx->skb->protocol != tx->sdata->control_port_protocol) &&
558 559 560
		 !(info->flags & IEEE80211_TX_CTL_INJECTED) &&
		 (!ieee80211_is_robust_mgmt_frame(hdr) ||
		  (ieee80211_is_action(hdr->frame_control) &&
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		   tx->sta && test_sta_flag(tx->sta, WLAN_STA_MFP)))) {
562
		I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted);
563
		return TX_DROP;
564
	} else
565 566 567
		tx->key = NULL;

	if (tx->key) {
568 569
		bool skip_hw = false;

570
		tx->key->tx_rx_count++;
571
		/* TODO: add threshold stuff again */
572

573 574 575 576
		switch (tx->key->conf.cipher) {
		case WLAN_CIPHER_SUITE_WEP40:
		case WLAN_CIPHER_SUITE_WEP104:
		case WLAN_CIPHER_SUITE_TKIP:
577
			if (!ieee80211_is_data_present(hdr->frame_control))
578 579
				tx->key = NULL;
			break;
580
		case WLAN_CIPHER_SUITE_CCMP:
581 582 583 584
			if (!ieee80211_is_data_present(hdr->frame_control) &&
			    !ieee80211_use_mfp(hdr->frame_control, tx->sta,
					       tx->skb))
				tx->key = NULL;
585 586 587 588
			else
				skip_hw = (tx->key->conf.flags &
					   IEEE80211_KEY_FLAG_SW_MGMT) &&
					ieee80211_is_mgmt(hdr->frame_control);
589
			break;
590
		case WLAN_CIPHER_SUITE_AES_CMAC:
591 592 593
			if (!ieee80211_is_mgmt(hdr->frame_control))
				tx->key = NULL;
			break;
594
		}
595

596 597 598
		if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED))
			return TX_DROP;

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599
		if (!skip_hw && tx->key &&
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600
		    tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
601
			info->control.hw_key = &tx->key->conf;
602 603
	}

604
	return TX_CONTINUE;
605 606
}

607
static ieee80211_tx_result debug_noinline
608
ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
609
{
610
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
611 612 613
	struct ieee80211_hdr *hdr = (void *)tx->skb->data;
	struct ieee80211_supported_band *sband;
	struct ieee80211_rate *rate;
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	int i;
	u32 len;
616 617
	bool inval = false, rts = false, short_preamble = false;
	struct ieee80211_tx_rate_control txrc;
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618
	bool assoc = false;
619

620
	memset(&txrc, 0, sizeof(txrc));
621

622
	sband = tx->local->hw.wiphy->bands[tx->channel->band];
623

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	len = min_t(u32, tx->skb->len + FCS_LEN,
625
			 tx->local->hw.wiphy->frag_threshold);
626 627 628 629 630 631 632

	/* 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;
633 634 635 636 637
	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;
638 639
	txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
		    tx->sdata->vif.type == NL80211_IFTYPE_ADHOC);
640 641

	/* set up RTS protection if desired */
642
	if (len > tx->local->hw.wiphy->rts_threshold) {
643
		txrc.rts = rts = true;
644 645
	}

646 647 648 649 650 651 652 653
	/*
	 * 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) ||
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	     (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE))))
655
		txrc.short_preamble = short_preamble = true;
656

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657 658
	if (tx->sta)
		assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
659 660 661 662 663

	/*
	 * Lets not bother rate control if we're associated and cannot
	 * talk to the sta. This should not happen.
	 */
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	if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc &&
665 666 667 668
		 !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",
669
		 tx->sdata->name, hdr->addr1,
670 671
		 tx->channel->band ? 5 : 2))
		return TX_DROP;
672

673 674 675 676
	/*
	 * If we're associated with the sta at this point we know we can at
	 * least send the frame at the lowest bit rate.
	 */
677 678 679 680 681
	rate_control_get_rate(tx->sdata, tx->sta, &txrc);

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

682
	if (txrc.reported_rate.idx < 0) {
683
		txrc.reported_rate = info->control.rates[0];
684 685 686
		if (tx->sta && ieee80211_is_data(hdr->frame_control))
			tx->sta->last_tx_rate = txrc.reported_rate;
	} else if (tx->sta)
687
		tx->sta->last_tx_rate = txrc.reported_rate;
688

689 690
	if (unlikely(!info->control.rates[0].count))
		info->control.rates[0].count = 1;
691

692 693 694 695
	if (WARN_ON_ONCE((info->control.rates[0].count > 1) &&
			 (info->flags & IEEE80211_TX_CTL_NO_ACK)))
		info->control.rates[0].count = 1;

696 697 698 699 700
	if (is_multicast_ether_addr(hdr->addr1)) {
		/*
		 * XXX: verify the rate is in the basic rateset
		 */
		return TX_CONTINUE;
701 702
	}

703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727
	/*
	 * 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;
728 729
	}

730 731 732 733 734 735 736 737 738 739 740 741 742 743
	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;
		}
744

745 746 747 748 749 750 751 752
		/*
		 * 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;
		}
753

754 755 756 757
		/* set up RTS protection if desired */
		if (rts)
			info->control.rates[i].flags |=
				IEEE80211_TX_RC_USE_RTS_CTS;
758

759
		/* RC is busted */
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760 761
		if (WARN_ON_ONCE(info->control.rates[i].idx >=
				 sband->n_bitrates)) {
762 763
			info->control.rates[i].idx = -1;
			continue;
764
		}
765

766 767 768 769 770 771 772 773 774 775 776 777 778
		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;
779 780
	}

781 782 783
	return TX_CONTINUE;
}

784 785 786 787 788 789 790 791 792
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;

793 794 795 796 797
	/*
	 * 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.
	 */
798
	if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR))
799 800
		return TX_CONTINUE;

801 802 803 804 805 806
	if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
		return TX_CONTINUE;

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

807 808 809
	if (ieee80211_is_qos_nullfunc(hdr->frame_control))
		return TX_CONTINUE;

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810 811 812 813 814
	/*
	 * Anything but QoS data that has a sequence number field
	 * (is long enough) gets a sequence number from the global
	 * counter.
	 */
815
	if (!ieee80211_is_data_qos(hdr->frame_control)) {
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816
		/* driver should assign sequence number */
817
		info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
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818 819 820
		/* 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;
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
		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;
}

846
static int ieee80211_fragment(struct ieee80211_tx_data *tx,
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847 848 849
			      struct sk_buff *skb, int hdrlen,
			      int frag_threshold)
{
850
	struct ieee80211_local *local = tx->local;
851
	struct ieee80211_tx_info *info;
852
	struct sk_buff *tmp;
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853 854 855 856 857 858 859
	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;

860 861
	/* first fragment was already added to queue by caller */

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862 863 864 865 866 867 868 869 870 871 872 873
	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;
874 875 876

		__skb_queue_tail(&tx->skbs, tmp);

J
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877 878 879 880
		skb_reserve(tmp, local->tx_headroom +
				 IEEE80211_ENCRYPT_HEADROOM);
		/* copy control information */
		memcpy(tmp->cb, skb->cb, sizeof(tmp->cb));
881 882 883 884 885 886 887 888

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

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

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889 890 891 892 893 894 895 896 897 898 899
		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;
	}

900
	/* adjust first fragment's length */
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901 902 903 904
	skb->len = hdrlen + per_fragm;
	return 0;
}

905
static ieee80211_tx_result debug_noinline
906 907
ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
{
J
Johannes Berg 已提交
908 909 910
	struct sk_buff *skb = tx->skb;
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
	struct ieee80211_hdr *hdr = (void *)skb->data;
911
	int frag_threshold = tx->local->hw.wiphy->frag_threshold;
J
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912 913
	int hdrlen;
	int fragnum;
914

915 916 917 918
	/* no matter what happens, tx->skb moves to tx->skbs */
	__skb_queue_tail(&tx->skbs, skb);
	tx->skb = NULL;

919 920 921 922
	if (info->flags & IEEE80211_TX_CTL_DONTFRAG)
		return TX_CONTINUE;

	if (tx->local->ops->set_frag_threshold)
923 924
		return TX_CONTINUE;

925 926
	/*
	 * Warn when submitting a fragmented A-MPDU frame and drop it.
J
Johannes Berg 已提交
927
	 * This scenario is handled in ieee80211_tx_prepare but extra
928
	 * caution taken here as fragmented ampdu may cause Tx stop.
929
	 */
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Sujith 已提交
930
	if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
931 932
		return TX_DROP;

933
	hdrlen = ieee80211_hdrlen(hdr->frame_control);
934

935
	/* internal error, why isn't DONTFRAG set? */
936
	if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))
J
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937
		return TX_DROP;
938

J
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939 940 941 942 943 944 945 946
	/*
	 * 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.
	 */
947
	if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold))
J
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948
		return TX_DROP;
949

J
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950 951
	/* update duration/seq/flags of fragments */
	fragnum = 0;
952 953

	skb_queue_walk(&tx->skbs, skb) {
J
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954 955
		int next_len;
		const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
956

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957 958
		hdr = (void *)skb->data;
		info = IEEE80211_SKB_CB(skb);
959

960
		if (!skb_queue_is_last(&tx->skbs, skb)) {
J
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961
			hdr->frame_control |= morefrags;
962 963 964 965 966 967 968 969 970 971
			/*
			 * 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;
J
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972 973 974
		} else {
			hdr->frame_control &= ~morefrags;
			next_len = 0;
975
		}
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976 977
		hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG);
		fragnum++;
978
	}
979

980
	return TX_CONTINUE;
981 982
}

983 984 985
static ieee80211_tx_result debug_noinline
ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
{
986
	struct sk_buff *skb;
987 988 989 990 991

	if (!tx->sta)
		return TX_CONTINUE;

	tx->sta->tx_packets++;
992
	skb_queue_walk(&tx->skbs, skb) {
993 994
		tx->sta->tx_fragments++;
		tx->sta->tx_bytes += skb->len;
995
	}
996 997 998 999

	return TX_CONTINUE;
}

1000
static ieee80211_tx_result debug_noinline
1001 1002
ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
{
1003 1004
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);

1005 1006 1007
	if (!tx->key)
		return TX_CONTINUE;

1008 1009 1010
	switch (tx->key->conf.cipher) {
	case WLAN_CIPHER_SUITE_WEP40:
	case WLAN_CIPHER_SUITE_WEP104:
1011
		return ieee80211_crypto_wep_encrypt(tx);
1012
	case WLAN_CIPHER_SUITE_TKIP:
1013
		return ieee80211_crypto_tkip_encrypt(tx);
1014
	case WLAN_CIPHER_SUITE_CCMP:
1015
		return ieee80211_crypto_ccmp_encrypt(tx);
1016
	case WLAN_CIPHER_SUITE_AES_CMAC:
1017
		return ieee80211_crypto_aes_cmac_encrypt(tx);
1018 1019 1020 1021 1022 1023 1024 1025
	default:
		/* handle hw-only algorithm */
		if (info->control.hw_key) {
			ieee80211_tx_set_protected(tx);
			return TX_CONTINUE;
		}
		break;

1026 1027 1028 1029 1030
	}

	return TX_DROP;
}

1031
static ieee80211_tx_result debug_noinline
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1032 1033
ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
{
1034
	struct sk_buff *skb;
J
Johannes Berg 已提交
1035 1036 1037
	struct ieee80211_hdr *hdr;
	int next_len;
	bool group_addr;
J
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1038

1039
	skb_queue_walk(&tx->skbs, skb) {
J
Johannes Berg 已提交
1040
		hdr = (void *) skb->data;
1041 1042
		if (unlikely(ieee80211_is_pspoll(hdr->frame_control)))
			break; /* must not overwrite AID */
1043 1044 1045 1046 1047
		if (!skb_queue_is_last(&tx->skbs, skb)) {
			struct sk_buff *next = skb_queue_next(&tx->skbs, skb);
			next_len = next->len;
		} else
			next_len = 0;
J
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1048
		group_addr = is_multicast_ether_addr(hdr->addr1);
J
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1049

J
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1050
		hdr->duration_id =
1051 1052
			ieee80211_duration(tx, skb, group_addr, next_len);
	}
J
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1053 1054 1055 1056

	return TX_CONTINUE;
}

1057 1058
/* actual transmit path */

1059 1060 1061 1062 1063 1064 1065 1066 1067 1068
static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx,
				  struct sk_buff *skb,
				  struct ieee80211_tx_info *info,
				  struct tid_ampdu_tx *tid_tx,
				  int tid)
{
	bool queued = false;

	if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
		info->flags |= IEEE80211_TX_CTL_AMPDU;
1069 1070 1071 1072 1073
	} else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) {
		/*
		 * nothing -- this aggregation session is being started
		 * but that might still fail with the driver
		 */
1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093
	} else {
		spin_lock(&tx->sta->lock);
		/*
		 * Need to re-check now, because we may get here
		 *
		 *  1) in the window during which the setup is actually
		 *     already done, but not marked yet because not all
		 *     packets are spliced over to the driver pending
		 *     queue yet -- if this happened we acquire the lock
		 *     either before or after the splice happens, but
		 *     need to recheck which of these cases happened.
		 *
		 *  2) during session teardown, if the OPERATIONAL bit
		 *     was cleared due to the teardown but the pointer
		 *     hasn't been assigned NULL yet (or we loaded it
		 *     before it was assigned) -- in this case it may
		 *     now be NULL which means we should just let the
		 *     packet pass through because splicing the frames
		 *     back is already done.
		 */
J
Johannes Berg 已提交
1094
		tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid);
1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111

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

	return queued;
}

1112 1113 1114
/*
 * initialises @tx
 */
1115
static ieee80211_tx_result
J
Johannes Berg 已提交
1116 1117 1118
ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
		     struct ieee80211_tx_data *tx,
		     struct sk_buff *skb)
1119
{
J
Johannes Berg 已提交
1120
	struct ieee80211_local *local = sdata->local;
1121
	struct ieee80211_hdr *hdr;
1122
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
J
Johannes Berg 已提交
1123
	int tid;
1124
	u8 *qc;
1125 1126 1127 1128

	memset(tx, 0, sizeof(*tx));
	tx->skb = skb;
	tx->local = local;
J
Johannes Berg 已提交
1129
	tx->sdata = sdata;
1130
	tx->channel = local->hw.conf.channel;
1131
	__skb_queue_head_init(&tx->skbs);
1132

1133 1134 1135 1136 1137 1138 1139
	/*
	 * 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;

1140 1141
	hdr = (struct ieee80211_hdr *) skb->data;

1142
	if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1143
		tx->sta = rcu_dereference(sdata->u.vlan.sta);
1144 1145
		if (!tx->sta && sdata->dev->ieee80211_ptr->use_4addr)
			return TX_DROP;
1146 1147
	} else if (info->flags & IEEE80211_TX_CTL_INJECTED) {
		tx->sta = sta_info_get_bss(sdata, hdr->addr1);
1148
	}
1149
	if (!tx->sta)
1150
		tx->sta = sta_info_get(sdata, hdr->addr1);
1151

1152
	if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) &&
1153
	    !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
1154 1155
	    (local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION) &&
	    !(local->hw.flags & IEEE80211_HW_TX_AMPDU_SETUP_IN_HW)) {
1156 1157
		struct tid_ampdu_tx *tid_tx;

S
Sujith 已提交
1158 1159 1160
		qc = ieee80211_get_qos_ctl(hdr);
		tid = *qc & IEEE80211_QOS_CTL_TID_MASK;

1161 1162 1163
		tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
		if (tid_tx) {
			bool queued;
1164

1165 1166 1167 1168 1169 1170
			queued = ieee80211_tx_prep_agg(tx, skb, info,
						       tid_tx, tid);

			if (unlikely(queued))
				return TX_QUEUED;
		}
S
Sujith 已提交
1171 1172
	}

1173
	if (is_multicast_ether_addr(hdr->addr1)) {
1174
		tx->flags &= ~IEEE80211_TX_UNICAST;
1175
		info->flags |= IEEE80211_TX_CTL_NO_ACK;
1176
	} else {
1177
		tx->flags |= IEEE80211_TX_UNICAST;
1178 1179
		if (unlikely(local->wifi_wme_noack_test))
			info->flags |= IEEE80211_TX_CTL_NO_ACK;
1180 1181 1182 1183 1184
		/*
		 * Flags are initialized to 0. Hence, no need to
		 * explicitly unset IEEE80211_TX_CTL_NO_ACK since
		 * it might already be set for injected frames.
		 */
1185
	}
1186

1187 1188 1189 1190 1191
	if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) {
		if (!(tx->flags & IEEE80211_TX_UNICAST) ||
		    skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold ||
		    info->flags & IEEE80211_TX_CTL_AMPDU)
			info->flags |= IEEE80211_TX_CTL_DONTFRAG;
1192 1193
	}

1194
	if (!tx->sta)
1195
		info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
J
Johannes Berg 已提交
1196
	else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT))
1197
		info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1198

1199
	info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
1200

1201
	return TX_CONTINUE;
1202 1203
}

1204 1205 1206 1207 1208
static bool ieee80211_tx_frags(struct ieee80211_local *local,
			       struct ieee80211_vif *vif,
			       struct ieee80211_sta *sta,
			       struct sk_buff_head *skbs,
			       bool txpending)
1209
{
1210
	struct sk_buff *skb, *tmp;
1211
	struct ieee80211_tx_info *info;
J
Johannes Berg 已提交
1212
	unsigned long flags;
1213

1214
	skb_queue_walk_safe(skbs, skb, tmp) {
J
Johannes Berg 已提交
1215 1216 1217 1218
		int q = skb_get_queue_mapping(skb);

		spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
		if (local->queue_stop_reasons[q] ||
1219 1220 1221 1222 1223 1224
		    (!txpending && !skb_queue_empty(&local->pending[q]))) {
			/*
			 * Since queue is stopped, queue up frames for later
			 * transmission from the tx-pending tasklet when the
			 * queue is woken again.
			 */
1225 1226 1227 1228
			if (txpending)
				skb_queue_splice(skbs, &local->pending[q]);
			else
				skb_queue_splice_tail(skbs, &local->pending[q]);
1229 1230 1231 1232 1233

			spin_unlock_irqrestore(&local->queue_stop_reason_lock,
					       flags);
			return false;
		}
J
Johannes Berg 已提交
1234
		spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1235

1236
		info = IEEE80211_SKB_CB(skb);
1237 1238
		info->control.vif = vif;
		info->control.sta = sta;
1239

1240 1241 1242
		__skb_unlink(skb, skbs);
		drv_tx(local, skb);
	}
1243

1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260
	return true;
}

/*
 * Returns false if the frame couldn't be transmitted but was queued instead.
 */
static bool __ieee80211_tx(struct ieee80211_local *local,
			   struct sk_buff_head *skbs, int led_len,
			   struct sta_info *sta, bool txpending)
{
	struct ieee80211_tx_info *info;
	struct ieee80211_sub_if_data *sdata;
	struct ieee80211_vif *vif;
	struct ieee80211_sta *pubsta;
	struct sk_buff *skb;
	bool result = true;
	__le16 fc;
1261

1262 1263
	if (WARN_ON(skb_queue_empty(skbs)))
		return true;
J
Johannes Berg 已提交
1264

1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288
	skb = skb_peek(skbs);
	fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
	info = IEEE80211_SKB_CB(skb);
	sdata = vif_to_sdata(info->control.vif);
	if (sta && !sta->uploaded)
		sta = NULL;

	if (sta)
		pubsta = &sta->sta;
	else
		pubsta = NULL;

	switch (sdata->vif.type) {
	case NL80211_IFTYPE_MONITOR:
		sdata = NULL;
		vif = NULL;
		break;
	case NL80211_IFTYPE_AP_VLAN:
		sdata = container_of(sdata->bss,
				     struct ieee80211_sub_if_data, u.ap);
		/* fall through */
	default:
		vif = &sdata->vif;
		break;
1289
	}
J
Johannes Berg 已提交
1290

1291 1292 1293 1294 1295 1296
	if (local->ops->tx_frags)
		drv_tx_frags(local, vif, pubsta, skbs);
	else
		result = ieee80211_tx_frags(local, vif, pubsta, skbs,
					    txpending);

1297 1298 1299
	ieee80211_tpt_led_trig_tx(local, fc, led_len);
	ieee80211_led_tx(local, 1);

1300 1301
	WARN_ON(!skb_queue_empty(skbs));

1302
	return result;
1303 1304
}

1305 1306 1307 1308 1309 1310
/*
 * 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)
{
1311
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
1312 1313
	ieee80211_tx_result res = TX_DROP;

1314 1315 1316 1317 1318 1319 1320
#define CALL_TXH(txh) \
	do {				\
		res = txh(tx);		\
		if (res != TX_CONTINUE)	\
			goto txh_done;	\
	} while (0)

1321
	CALL_TXH(ieee80211_tx_h_dynamic_ps);
1322 1323
	CALL_TXH(ieee80211_tx_h_check_assoc);
	CALL_TXH(ieee80211_tx_h_ps_buf);
1324
	CALL_TXH(ieee80211_tx_h_check_control_port_protocol);
1325
	CALL_TXH(ieee80211_tx_h_select_key);
1326 1327
	if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
		CALL_TXH(ieee80211_tx_h_rate_ctrl);
1328 1329 1330 1331 1332

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

	CALL_TXH(ieee80211_tx_h_michael_mic_add);
1333 1334
	CALL_TXH(ieee80211_tx_h_sequence);
	CALL_TXH(ieee80211_tx_h_fragment);
1335
	/* handlers after fragment must be aware of tx info fragmentation! */
1336 1337
	CALL_TXH(ieee80211_tx_h_stats);
	CALL_TXH(ieee80211_tx_h_encrypt);
1338 1339
	if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
		CALL_TXH(ieee80211_tx_h_calculate_duration);
1340
#undef CALL_TXH
1341

1342
 txh_done:
1343
	if (unlikely(res == TX_DROP)) {
1344
		I802_DEBUG_INC(tx->local->tx_handlers_drop);
1345 1346 1347 1348
		if (tx->skb)
			dev_kfree_skb(tx->skb);
		else
			__skb_queue_purge(&tx->skbs);
1349 1350
		return -1;
	} else if (unlikely(res == TX_QUEUED)) {
1351
		I802_DEBUG_INC(tx->local->tx_handlers_queued);
1352 1353 1354 1355 1356 1357
		return -1;
	}

	return 0;
}

1358 1359 1360 1361
/*
 * Returns false if the frame couldn't be transmitted but was queued instead.
 */
static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata,
J
Johannes Berg 已提交
1362
			 struct sk_buff *skb, bool txpending)
1363
{
J
Johannes Berg 已提交
1364
	struct ieee80211_local *local = sdata->local;
1365
	struct ieee80211_tx_data tx;
1366
	ieee80211_tx_result res_prepare;
1367
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1368
	bool result = true;
1369
	int led_len;
1370 1371 1372

	if (unlikely(skb->len < 10)) {
		dev_kfree_skb(skb);
1373
		return true;
1374 1375
	}

1376 1377
	rcu_read_lock();

1378
	/* initialises tx */
1379
	led_len = skb->len;
J
Johannes Berg 已提交
1380
	res_prepare = ieee80211_tx_prepare(sdata, &tx, skb);
1381

1382
	if (unlikely(res_prepare == TX_DROP)) {
1383
		dev_kfree_skb(skb);
1384
		goto out;
1385
	} else if (unlikely(res_prepare == TX_QUEUED)) {
1386
		goto out;
1387 1388
	}

1389
	tx.channel = local->hw.conf.channel;
1390
	info->band = tx.channel->band;
1391

1392
	if (!invoke_tx_handlers(&tx))
1393 1394
		result = __ieee80211_tx(local, &tx.skbs, led_len,
					tx.sta, txpending);
1395
 out:
1396
	rcu_read_unlock();
1397
	return result;
1398 1399 1400 1401
}

/* device xmit handlers */

1402
static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata,
1403 1404 1405
				struct sk_buff *skb,
				int head_need, bool may_encrypt)
{
1406
	struct ieee80211_local *local = sdata->local;
1407 1408
	int tail_need = 0;

1409
	if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) {
1410 1411 1412 1413 1414
		tail_need = IEEE80211_ENCRYPT_TAILROOM;
		tail_need -= skb_tailroom(skb);
		tail_need = max_t(int, tail_need, 0);
	}

1415
	if (skb_cloned(skb))
1416
		I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1417
	else if (head_need || tail_need)
1418
		I802_DEBUG_INC(local->tx_expand_skb_head);
1419 1420
	else
		return 0;
1421 1422

	if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
J
Joe Perches 已提交
1423 1424
		wiphy_debug(local->hw.wiphy,
			    "failed to reallocate TX buffer\n");
1425 1426 1427 1428 1429 1430
		return -ENOMEM;
	}

	return 0;
}

1431
void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
1432
{
J
Johannes Berg 已提交
1433
	struct ieee80211_local *local = sdata->local;
1434
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1435
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1436
	int headroom;
1437
	bool may_encrypt;
1438

1439 1440
	rcu_read_lock();

J
Johannes Berg 已提交
1441
	may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT);
1442

J
Johannes Berg 已提交
1443
	headroom = local->tx_headroom;
1444 1445 1446 1447 1448
	if (may_encrypt)
		headroom += IEEE80211_ENCRYPT_HEADROOM;
	headroom -= skb_headroom(skb);
	headroom = max_t(int, 0, headroom);

1449
	if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) {
1450
		dev_kfree_skb(skb);
1451
		rcu_read_unlock();
J
Johannes Berg 已提交
1452
		return;
1453 1454
	}

1455
	hdr = (struct ieee80211_hdr *) skb->data;
1456
	info->control.vif = &sdata->vif;
1457

1458 1459 1460 1461 1462
	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 */
1463
				rcu_read_unlock();
1464 1465 1466
				return;
			}

1467
	ieee80211_set_qos_hdr(sdata, skb);
J
Johannes Berg 已提交
1468
	ieee80211_tx(sdata, skb, false);
1469
	rcu_read_unlock();
1470 1471
}

1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554
static bool ieee80211_parse_tx_radiotap(struct sk_buff *skb)
{
	struct ieee80211_radiotap_iterator iterator;
	struct ieee80211_radiotap_header *rthdr =
		(struct ieee80211_radiotap_header *) skb->data;
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
	int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len,
						   NULL);
	u16 txflags;

	info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
		       IEEE80211_TX_CTL_DONTFRAG;

	/*
	 * for every radiotap entry that is present
	 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
	 * entries present, or -EINVAL on error)
	 */

	while (!ret) {
		ret = ieee80211_radiotap_iterator_next(&iterator);

		if (ret)
			continue;

		/* see if this argument is something we can use */
		switch (iterator.this_arg_index) {
		/*
		 * You must take care when dereferencing iterator.this_arg
		 * for multibyte types... the pointer is not aligned.  Use
		 * get_unaligned((type *)iterator.this_arg) to dereference
		 * iterator.this_arg for type "type" safely on all arches.
		*/
		case IEEE80211_RADIOTAP_FLAGS:
			if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
				/*
				 * this indicates that the skb we have been
				 * handed has the 32-bit FCS CRC at the end...
				 * we should react to that by snipping it off
				 * because it will be recomputed and added
				 * on transmission
				 */
				if (skb->len < (iterator._max_length + FCS_LEN))
					return false;

				skb_trim(skb, skb->len - FCS_LEN);
			}
			if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
				info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT;
			if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
				info->flags &= ~IEEE80211_TX_CTL_DONTFRAG;
			break;

		case IEEE80211_RADIOTAP_TX_FLAGS:
			txflags = get_unaligned_le16(iterator.this_arg);
			if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK)
				info->flags |= IEEE80211_TX_CTL_NO_ACK;
			break;

		/*
		 * Please update the file
		 * Documentation/networking/mac80211-injection.txt
		 * when parsing new fields here.
		 */

		default:
			break;
		}
	}

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

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

	return true;
}

1555 1556
netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
					 struct net_device *dev)
1557 1558
{
	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1559
	struct ieee80211_channel *chan = local->hw.conf.channel;
1560 1561
	struct ieee80211_radiotap_header *prthdr =
		(struct ieee80211_radiotap_header *)skb->data;
J
Johannes Berg 已提交
1562
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1563
	struct ieee80211_hdr *hdr;
J
Johannes Berg 已提交
1564
	struct ieee80211_sub_if_data *tmp_sdata, *sdata;
1565
	u16 len_rthdr;
J
Johannes Berg 已提交
1566
	int hdrlen;
1567

1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587
	/*
	 * 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;

1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601
	/* 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 */
1602 1603 1604 1605 1606 1607 1608

	/*
	 * 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
	 */
1609
	skb_set_mac_header(skb, len_rthdr);
1610
	/*
1611 1612
	 * 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
1613
	 */
1614 1615
	skb_set_network_header(skb, len_rthdr);
	skb_set_transport_header(skb, len_rthdr);
1616

J
Johannes Berg 已提交
1617 1618 1619 1620 1621 1622 1623 1624 1625
	if (skb->len < len_rthdr + 2)
		goto fail;

	hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
	hdrlen = ieee80211_hdrlen(hdr->frame_control);

	if (skb->len < len_rthdr + hdrlen)
		goto fail;

1626 1627 1628 1629
	/*
	 * Initialize skb->protocol if the injected frame is a data frame
	 * carrying a rfc1042 header
	 */
J
Johannes Berg 已提交
1630 1631 1632 1633 1634 1635 1636
	if (ieee80211_is_data(hdr->frame_control) &&
	    skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) {
		u8 *payload = (u8 *)hdr + hdrlen;

		if (compare_ether_addr(payload, rfc1042_header) == 0)
			skb->protocol = cpu_to_be16((payload[6] << 8) |
						    payload[7]);
1637 1638
	}

J
Johannes Berg 已提交
1639 1640
	memset(info, 0, sizeof(*info));

J
Johannes Berg 已提交
1641
	info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
1642 1643 1644 1645 1646
		      IEEE80211_TX_CTL_INJECTED;

	/* process and remove the injection radiotap header */
	if (!ieee80211_parse_tx_radiotap(skb))
		goto fail;
J
Johannes Berg 已提交
1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671

	rcu_read_lock();

	/*
	 * We process outgoing injected frames that have a local address
	 * we handle as though they are non-injected frames.
	 * This code here isn't entirely correct, the local MAC address
	 * isn't always enough to find the interface to use; for proper
	 * VLAN/WDS support we will need a different mechanism (which
	 * likely isn't going to be monitor interfaces).
	 */
	sdata = IEEE80211_DEV_TO_SUB_IF(dev);

	list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) {
		if (!ieee80211_sdata_running(tmp_sdata))
			continue;
		if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR ||
		    tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
		    tmp_sdata->vif.type == NL80211_IFTYPE_WDS)
			continue;
		if (compare_ether_addr(tmp_sdata->vif.addr, hdr->addr2) == 0) {
			sdata = tmp_sdata;
			break;
		}
	}
1672

J
Johannes Berg 已提交
1673 1674 1675
	ieee80211_xmit(sdata, skb);
	rcu_read_unlock();

1676
	return NETDEV_TX_OK;
1677 1678 1679 1680

fail:
	dev_kfree_skb(skb);
	return NETDEV_TX_OK; /* meaning, we dealt with the skb */
1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697
}

/**
 * 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).
 */
1698 1699
netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
				    struct net_device *dev)
1700
{
1701 1702
	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
	struct ieee80211_local *local = sdata->local;
1703
	struct ieee80211_tx_info *info;
1704
	int ret = NETDEV_TX_BUSY, head_need;
1705 1706
	u16 ethertype, hdrlen,  meshhdrlen = 0;
	__le16 fc;
1707
	struct ieee80211_hdr hdr;
1708
	struct ieee80211s_hdr mesh_hdr __maybe_unused;
1709
	struct mesh_path __maybe_unused *mppath = NULL;
1710 1711
	const u8 *encaps_data;
	int encaps_len, skip_header_bytes;
1712
	int nh_pos, h_pos;
1713
	struct sta_info *sta = NULL;
J
Johannes Berg 已提交
1714
	bool wme_sta = false, authorized = false, tdls_auth = false;
1715
	bool tdls_direct = false;
J
Johannes Berg 已提交
1716 1717 1718
	bool multicast;
	u32 info_flags = 0;
	u16 info_id = 0;
1719 1720

	if (unlikely(skb->len < ETH_HLEN)) {
1721
		ret = NETDEV_TX_OK;
1722 1723 1724 1725 1726 1727
		goto fail;
	}

	/* convert Ethernet header to proper 802.11 header (based on
	 * operation mode) */
	ethertype = (skb->data[12] << 8) | skb->data[13];
1728
	fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
1729

1730
	switch (sdata->vif.type) {
1731
	case NL80211_IFTYPE_AP_VLAN:
1732
		rcu_read_lock();
1733
		sta = rcu_dereference(sdata->u.vlan.sta);
1734 1735 1736 1737
		if (sta) {
			fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
			/* RA TA DA SA */
			memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN);
1738
			memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1739 1740 1741
			memcpy(hdr.addr3, skb->data, ETH_ALEN);
			memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
			hdrlen = 30;
J
Johannes Berg 已提交
1742 1743
			authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
			wme_sta = test_sta_flag(sta, WLAN_STA_WME);
1744 1745 1746 1747 1748 1749
		}
		rcu_read_unlock();
		if (sta)
			break;
		/* fall through */
	case NL80211_IFTYPE_AP:
1750
		fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
1751 1752
		/* DA BSSID SA */
		memcpy(hdr.addr1, skb->data, ETH_ALEN);
1753
		memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1754 1755
		memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
		hdrlen = 24;
1756
		break;
1757
	case NL80211_IFTYPE_WDS:
1758
		fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1759 1760
		/* RA TA DA SA */
		memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
1761
		memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1762 1763 1764
		memcpy(hdr.addr3, skb->data, ETH_ALEN);
		memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
		hdrlen = 30;
1765
		break;
1766
#ifdef CONFIG_MAC80211_MESH
1767
	case NL80211_IFTYPE_MESH_POINT:
1768
		if (!sdata->u.mesh.mshcfg.dot11MeshTTL) {
1769
			/* Do not send frames with mesh_ttl == 0 */
1770
			sdata->u.mesh.mshstats.dropped_frames_ttl++;
1771
			ret = NETDEV_TX_OK;
1772
			goto fail;
1773
		}
1774
		rcu_read_lock();
1775 1776
		if (!is_multicast_ether_addr(skb->data))
			mppath = mpp_path_lookup(skb->data, sdata);
1777

1778
		/*
1779 1780 1781 1782
		 * Use address extension if it is a packet from
		 * another interface or if we know the destination
		 * is being proxied by a portal (i.e. portal address
		 * differs from proxied address)
1783
		 */
1784
		if (compare_ether_addr(sdata->vif.addr,
1785
				       skb->data + ETH_ALEN) == 0 &&
1786
		    !(mppath && compare_ether_addr(mppath->mpp, skb->data))) {
1787 1788
			hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
					skb->data, skb->data + ETH_ALEN);
1789
			rcu_read_unlock();
1790
			meshhdrlen = ieee80211_new_mesh_header(&mesh_hdr,
1791
					sdata, NULL, NULL);
1792
		} else {
1793
			int is_mesh_mcast = 1;
1794
			const u8 *mesh_da;
1795 1796

			if (is_multicast_ether_addr(skb->data))
1797 1798
				/* DA TA mSA AE:SA */
				mesh_da = skb->data;
1799
			else {
1800 1801
				static const u8 bcast[ETH_ALEN] =
					{ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
1802 1803 1804 1805
				if (mppath) {
					/* RA TA mDA mSA AE:DA SA */
					mesh_da = mppath->mpp;
					is_mesh_mcast = 0;
1806
				} else {
1807
					/* DA TA mSA AE:SA */
1808 1809
					mesh_da = bcast;
				}
1810
			}
1811
			hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
1812
					mesh_da, sdata->vif.addr);
1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825
			rcu_read_unlock();
			if (is_mesh_mcast)
				meshhdrlen =
					ieee80211_new_mesh_header(&mesh_hdr,
							sdata,
							skb->data + ETH_ALEN,
							NULL);
			else
				meshhdrlen =
					ieee80211_new_mesh_header(&mesh_hdr,
							sdata,
							skb->data,
							skb->data + ETH_ALEN);
1826 1827

		}
1828 1829
		break;
#endif
1830
	case NL80211_IFTYPE_STATION:
1831
		if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
J
Johannes Berg 已提交
1832 1833
			bool tdls_peer = false;

1834 1835
			rcu_read_lock();
			sta = sta_info_get(sdata, skb->data);
J
Johannes Berg 已提交
1836 1837 1838 1839 1840 1841 1842 1843 1844
			if (sta) {
				authorized = test_sta_flag(sta,
							WLAN_STA_AUTHORIZED);
				wme_sta = test_sta_flag(sta, WLAN_STA_WME);
				tdls_peer = test_sta_flag(sta,
							 WLAN_STA_TDLS_PEER);
				tdls_auth = test_sta_flag(sta,
						WLAN_STA_TDLS_PEER_AUTH);
			}
1845 1846 1847 1848 1849 1850 1851
			rcu_read_unlock();

			/*
			 * If the TDLS link is enabled, send everything
			 * directly. Otherwise, allow TDLS setup frames
			 * to be transmitted indirectly.
			 */
J
Johannes Berg 已提交
1852
			tdls_direct = tdls_peer && (tdls_auth ||
1853 1854 1855 1856 1857 1858
				 !(ethertype == ETH_P_TDLS && skb->len > 14 &&
				   skb->data[14] == WLAN_TDLS_SNAP_RFTYPE));
		}

		if (tdls_direct) {
			/* link during setup - throw out frames to peer */
J
Johannes Berg 已提交
1859
			if (!tdls_auth) {
1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872
				ret = NETDEV_TX_OK;
				goto fail;
			}

			/* DA SA BSSID */
			memcpy(hdr.addr1, skb->data, ETH_ALEN);
			memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
			memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN);
			hdrlen = 24;
		}  else if (sdata->u.mgd.use_4addr &&
			    cpu_to_be16(ethertype) != sdata->control_port_protocol) {
			fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
					  IEEE80211_FCTL_TODS);
1873
			/* RA TA DA SA */
1874
			memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
1875
			memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1876 1877 1878 1879 1880 1881
			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 */
1882
			memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
1883 1884 1885 1886
			memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
			memcpy(hdr.addr3, skb->data, ETH_ALEN);
			hdrlen = 24;
		}
1887
		break;
1888
	case NL80211_IFTYPE_ADHOC:
1889 1890 1891
		/* DA SA BSSID */
		memcpy(hdr.addr1, skb->data, ETH_ALEN);
		memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1892
		memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN);
1893
		hdrlen = 24;
1894 1895
		break;
	default:
1896
		ret = NETDEV_TX_OK;
1897 1898 1899
		goto fail;
	}

1900 1901 1902 1903 1904
	/*
	 * There's no need to try to look up the destination
	 * if it is a multicast address (which can only happen
	 * in AP mode)
	 */
J
Johannes Berg 已提交
1905 1906
	multicast = is_multicast_ether_addr(hdr.addr1);
	if (!multicast) {
1907
		rcu_read_lock();
1908
		sta = sta_info_get(sdata, hdr.addr1);
J
Johannes Berg 已提交
1909 1910 1911 1912
		if (sta) {
			authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
			wme_sta = test_sta_flag(sta, WLAN_STA_WME);
		}
1913
		rcu_read_unlock();
1914 1915
	}

1916 1917
	/* For mesh, the use of the QoS header is mandatory */
	if (ieee80211_vif_is_mesh(&sdata->vif))
J
Johannes Berg 已提交
1918
		wme_sta = true;
1919

1920
	/* receiver and we are QoS enabled, use a QoS type frame */
J
Johannes Berg 已提交
1921
	if (wme_sta && local->hw.queues >= 4) {
1922
		fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
1923 1924 1925 1926
		hdrlen += 2;
	}

	/*
1927 1928
	 * Drop unicast frames to unauthorised stations unless they are
	 * EAPOL frames from the local station.
1929
	 */
1930 1931 1932 1933
	if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) &&
		     !is_multicast_ether_addr(hdr.addr1) && !authorized &&
		     (cpu_to_be16(ethertype) != sdata->control_port_protocol ||
		      compare_ether_addr(sdata->vif.addr, skb->data + ETH_ALEN)))) {
1934 1935
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
		if (net_ratelimit())
1936
			printk(KERN_DEBUG "%s: dropped frame to %pM"
1937
			       " (unauthorized port)\n", dev->name,
1938
			       hdr.addr1);
1939 1940 1941 1942
#endif

		I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);

1943
		ret = NETDEV_TX_OK;
1944 1945 1946
		goto fail;
	}

J
Johannes Berg 已提交
1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985
	if (unlikely(!multicast && skb->sk &&
		     skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) {
		struct sk_buff *orig_skb = skb;

		skb = skb_clone(skb, GFP_ATOMIC);
		if (skb) {
			unsigned long flags;
			int id, r;

			spin_lock_irqsave(&local->ack_status_lock, flags);
			r = idr_get_new_above(&local->ack_status_frames,
					      orig_skb, 1, &id);
			if (r == -EAGAIN) {
				idr_pre_get(&local->ack_status_frames,
					    GFP_ATOMIC);
				r = idr_get_new_above(&local->ack_status_frames,
						      orig_skb, 1, &id);
			}
			if (WARN_ON(!id) || id > 0xffff) {
				idr_remove(&local->ack_status_frames, id);
				r = -ERANGE;
			}
			spin_unlock_irqrestore(&local->ack_status_lock, flags);

			if (!r) {
				info_id = id;
				info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
			} else if (skb_shared(skb)) {
				kfree_skb(orig_skb);
			} else {
				kfree_skb(skb);
				skb = orig_skb;
			}
		} else {
			/* couldn't clone -- lose tx status ... */
			skb = orig_skb;
		}
	}

1986 1987 1988 1989
	/*
	 * If the skb is shared we need to obtain our own copy.
	 */
	if (skb_shared(skb)) {
J
Johannes Berg 已提交
1990 1991 1992 1993 1994
		struct sk_buff *tmp_skb = skb;

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

1995
		skb = skb_clone(skb, GFP_ATOMIC);
1996 1997 1998 1999 2000 2001 2002 2003
		kfree_skb(tmp_skb);

		if (!skb) {
			ret = NETDEV_TX_OK;
			goto fail;
		}
	}

2004
	hdr.frame_control = fc;
2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021
	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;
	}

2022 2023 2024
	nh_pos = skb_network_header(skb) - skb->data;
	h_pos = skb_transport_header(skb) - skb->data;

2025 2026 2027 2028
	skb_pull(skb, skip_header_bytes);
	nh_pos -= skip_header_bytes;
	h_pos -= skip_header_bytes;

2029
	head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
2030

2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041
	/*
	 * 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.
	 */
2042

2043
	if (head_need > 0 || skb_cloned(skb)) {
2044 2045 2046
		head_need += IEEE80211_ENCRYPT_HEADROOM;
		head_need += local->tx_headroom;
		head_need = max_t(int, 0, head_need);
2047
		if (ieee80211_skb_resize(sdata, skb, head_need, true))
2048 2049 2050 2051 2052 2053 2054 2055
			goto fail;
	}

	if (encaps_data) {
		memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
		nh_pos += encaps_len;
		h_pos += encaps_len;
	}
2056

2057
#ifdef CONFIG_MAC80211_MESH
2058 2059 2060 2061 2062
	if (meshhdrlen > 0) {
		memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
		nh_pos += meshhdrlen;
		h_pos += meshhdrlen;
	}
2063
#endif
2064

2065
	if (ieee80211_is_data_qos(fc)) {
2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077
		__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);

2078 2079 2080
	nh_pos += hdrlen;
	h_pos += hdrlen;

2081 2082
	dev->stats.tx_packets++;
	dev->stats.tx_bytes += skb->len;
2083 2084 2085 2086 2087 2088 2089 2090

	/* 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);

2091
	info = IEEE80211_SKB_CB(skb);
J
Johannes Berg 已提交
2092 2093
	memset(info, 0, sizeof(*info));

2094
	dev->trans_start = jiffies;
J
Johannes Berg 已提交
2095 2096 2097 2098

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

J
Johannes Berg 已提交
2099
	ieee80211_xmit(sdata, skb);
2100

2101
	return NETDEV_TX_OK;
2102 2103

 fail:
2104
	if (ret == NETDEV_TX_OK)
2105 2106 2107 2108 2109 2110
		dev_kfree_skb(skb);

	return ret;
}


2111 2112 2113 2114
/*
 * ieee80211_clear_tx_pending may not be called in a context where
 * it is possible that it packets could come in again.
 */
2115 2116
void ieee80211_clear_tx_pending(struct ieee80211_local *local)
{
J
Johannes Berg 已提交
2117
	int i;
2118

2119 2120
	for (i = 0; i < local->hw.queues; i++)
		skb_queue_purge(&local->pending[i]);
2121 2122
}

2123 2124 2125 2126 2127
/*
 * Returns false if the frame couldn't be transmitted but was queued instead,
 * which in this case means re-queued -- take as an indication to stop sending
 * more pending frames.
 */
2128 2129 2130 2131 2132 2133 2134
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;
2135
	bool result;
2136

2137
	sdata = vif_to_sdata(info->control.vif);
2138 2139

	if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) {
2140
		result = ieee80211_tx(sdata, skb, true);
2141
	} else {
2142 2143 2144 2145 2146
		struct sk_buff_head skbs;

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

2147
		hdr = (struct ieee80211_hdr *)skb->data;
2148
		sta = sta_info_get(sdata, hdr->addr1);
2149

2150
		result = __ieee80211_tx(local, &skbs, skb->len, sta, true);
2151 2152 2153 2154 2155
	}

	return result;
}

2156
/*
J
Johannes Berg 已提交
2157
 * Transmit all pending packets. Called from tasklet.
2158
 */
2159 2160 2161
void ieee80211_tx_pending(unsigned long data)
{
	struct ieee80211_local *local = (struct ieee80211_local *)data;
2162
	struct ieee80211_sub_if_data *sdata;
2163
	unsigned long flags;
2164
	int i;
J
Johannes Berg 已提交
2165
	bool txok;
2166

2167
	rcu_read_lock();
2168

J
Johannes Berg 已提交
2169
	spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
2170 2171 2172 2173 2174
	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
2175
		if (local->queue_stop_reasons[i] ||
2176
		    skb_queue_empty(&local->pending[i]))
2177
			continue;
2178

2179
		while (!skb_queue_empty(&local->pending[i])) {
J
Johannes Berg 已提交
2180
			struct sk_buff *skb = __skb_dequeue(&local->pending[i]);
2181 2182
			struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);

2183 2184 2185 2186 2187
			if (WARN_ON(!info->control.vif)) {
				kfree_skb(skb);
				continue;
			}

J
Johannes Berg 已提交
2188 2189 2190 2191 2192 2193 2194
			spin_unlock_irqrestore(&local->queue_stop_reason_lock,
						flags);

			txok = ieee80211_tx_pending_skb(local, skb);
			spin_lock_irqsave(&local->queue_stop_reason_lock,
					  flags);
			if (!txok)
2195
				break;
2196
		}
2197 2198 2199

		if (skb_queue_empty(&local->pending[i]))
			list_for_each_entry_rcu(sdata, &local->interfaces, list)
J
Johannes Berg 已提交
2200
				netif_wake_subqueue(sdata->dev, i);
2201
	}
J
Johannes Berg 已提交
2202
	spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
2203

2204
	rcu_read_unlock();
2205 2206 2207 2208
}

/* functions for drivers to get certain frames */

R
Rami Rosen 已提交
2209
static void ieee80211_beacon_add_tim(struct ieee80211_if_ap *bss,
2210 2211
				     struct sk_buff *skb,
				     struct beacon_data *beacon)
2212 2213 2214 2215 2216 2217 2218 2219 2220 2221 2222 2223 2224 2225
{
	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)
2226
		bss->dtim_count = beacon->dtim_period - 1;
2227 2228 2229 2230 2231 2232 2233
	else
		bss->dtim_count--;

	tim = pos = (u8 *) skb_put(skb, 6);
	*pos++ = WLAN_EID_TIM;
	*pos++ = 4;
	*pos++ = bss->dtim_count;
2234
	*pos++ = beacon->dtim_period;
2235 2236 2237 2238

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

2239 2240
	bss->dtim_bc_mc = aid0 == 1;

2241 2242 2243 2244 2245 2246 2247 2248 2249 2250 2251 2252 2253 2254 2255 2256 2257 2258 2259 2260 2261 2262 2263 2264 2265 2266 2267 2268 2269 2270 2271 2272
	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 */
	}
}

2273 2274 2275
struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
					 struct ieee80211_vif *vif,
					 u16 *tim_offset, u16 *tim_length)
2276 2277
{
	struct ieee80211_local *local = hw_to_local(hw);
2278
	struct sk_buff *skb = NULL;
2279
	struct ieee80211_tx_info *info;
2280 2281
	struct ieee80211_sub_if_data *sdata = NULL;
	struct ieee80211_if_ap *ap = NULL;
2282
	struct beacon_data *beacon;
2283
	struct ieee80211_supported_band *sband;
2284
	enum ieee80211_band band = local->hw.conf.channel->band;
2285
	struct ieee80211_tx_rate_control txrc;
2286

2287
	sband = local->hw.wiphy->bands[band];
2288 2289

	rcu_read_lock();
2290

2291
	sdata = vif_to_sdata(vif);
2292

2293 2294 2295
	if (!ieee80211_sdata_running(sdata))
		goto out;

2296 2297 2298 2299 2300
	if (tim_offset)
		*tim_offset = 0;
	if (tim_length)
		*tim_length = 0;

2301
	if (sdata->vif.type == NL80211_IFTYPE_AP) {
2302 2303
		ap = &sdata->u.ap;
		beacon = rcu_dereference(ap->beacon);
D
Dan Carpenter 已提交
2304
		if (beacon) {
J
Johannes Berg 已提交
2305 2306 2307 2308 2309 2310 2311 2312 2313
			/*
			 * 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;
2314

J
Johannes Berg 已提交
2315 2316 2317
			skb_reserve(skb, local->tx_headroom);
			memcpy(skb_put(skb, beacon->head_len), beacon->head,
			       beacon->head_len);
2318

2319 2320 2321 2322 2323 2324 2325 2326
			/*
			 * 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
2327
				ieee80211_beacon_add_tim(ap, skb, beacon);
2328 2329 2330 2331
			} else {
				unsigned long flags;

				spin_lock_irqsave(&local->sta_lock, flags);
R
Rami Rosen 已提交
2332
				ieee80211_beacon_add_tim(ap, skb, beacon);
2333 2334
				spin_unlock_irqrestore(&local->sta_lock, flags);
			}
2335

2336 2337 2338 2339 2340
			if (tim_offset)
				*tim_offset = beacon->head_len;
			if (tim_length)
				*tim_length = skb->len - beacon->head_len;

J
Johannes Berg 已提交
2341 2342 2343
			if (beacon->tail)
				memcpy(skb_put(skb, beacon->tail_len),
				       beacon->tail, beacon->tail_len);
2344 2345
		} else
			goto out;
2346
	} else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
2347
		struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
2348
		struct ieee80211_hdr *hdr;
2349
		struct sk_buff *presp = rcu_dereference(ifibss->presp);
2350

2351
		if (!presp)
2352 2353
			goto out;

2354
		skb = skb_copy(presp, GFP_ATOMIC);
2355 2356 2357 2358
		if (!skb)
			goto out;

		hdr = (struct ieee80211_hdr *) skb->data;
2359 2360
		hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
						 IEEE80211_STYPE_BEACON);
J
Johannes Berg 已提交
2361
	} else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2362 2363
		struct ieee80211_mgmt *mgmt;
		u8 *pos;
2364 2365
		int hdr_len = offsetof(struct ieee80211_mgmt, u.beacon) +
			      sizeof(mgmt->u.beacon);
2366

2367 2368 2369 2370 2371
#ifdef CONFIG_MAC80211_MESH
		if (!sdata->u.mesh.mesh_id_len)
			goto out;
#endif

2372 2373 2374 2375 2376 2377
		skb = dev_alloc_skb(local->tx_headroom +
				    hdr_len +
				    2 + /* NULL SSID */
				    2 + 8 + /* supported rates */
				    2 + 3 + /* DS params */
				    2 + (IEEE80211_MAX_SUPP_RATES - 8) +
2378 2379
				    2 + sizeof(struct ieee80211_ht_cap) +
				    2 + sizeof(struct ieee80211_ht_info) +
2380 2381 2382
				    2 + sdata->u.mesh.mesh_id_len +
				    2 + sizeof(struct ieee80211_meshconf_ie) +
				    sdata->u.mesh.ie_len);
J
Johannes Berg 已提交
2383 2384 2385 2386
		if (!skb)
			goto out;

		skb_reserve(skb, local->hw.extra_tx_headroom);
2387 2388
		mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len);
		memset(mgmt, 0, hdr_len);
2389 2390
		mgmt->frame_control =
		    cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_BEACON);
J
Johannes Berg 已提交
2391
		memset(mgmt->da, 0xff, ETH_ALEN);
2392 2393
		memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
		memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
J
Johannes Berg 已提交
2394
		mgmt->u.beacon.beacon_int =
2395
			cpu_to_le16(sdata->vif.bss_conf.beacon_int);
2396 2397
		mgmt->u.beacon.capab_info |= cpu_to_le16(
			sdata->u.mesh.security ? WLAN_CAPABILITY_PRIVACY : 0);
J
Johannes Berg 已提交
2398 2399 2400 2401 2402

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

2403
		if (ieee80211_add_srates_ie(&sdata->vif, skb) ||
2404
		    mesh_add_ds_params_ie(skb, sdata) ||
2405
		    ieee80211_add_ext_srates_ie(&sdata->vif, skb) ||
2406
		    mesh_add_rsn_ie(skb, sdata) ||
2407 2408
		    mesh_add_ht_cap_ie(skb, sdata) ||
		    mesh_add_ht_info_ie(skb, sdata) ||
2409 2410 2411 2412 2413 2414
		    mesh_add_meshid_ie(skb, sdata) ||
		    mesh_add_meshconf_ie(skb, sdata) ||
		    mesh_add_vendor_ies(skb, sdata)) {
			pr_err("o11s: couldn't add ies!\n");
			goto out;
		}
2415 2416
	} else {
		WARN_ON(1);
2417
		goto out;
2418 2419
	}

2420 2421
	info = IEEE80211_SKB_CB(skb);

J
Johannes Berg 已提交
2422
	info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
2423
	info->flags |= IEEE80211_TX_CTL_NO_ACK;
2424
	info->band = band;
2425 2426 2427 2428 2429 2430 2431

	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;
2432 2433 2434 2435 2436
	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;
2437
	txrc.bss = true;
2438
	rate_control_get_rate(sdata, NULL, &txrc);
2439 2440

	info->control.vif = vif;
2441

2442 2443 2444
	info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT |
			IEEE80211_TX_CTL_ASSIGN_SEQ |
			IEEE80211_TX_CTL_FIRST_FRAGMENT;
2445
 out:
2446
	rcu_read_unlock();
2447 2448
	return skb;
}
2449
EXPORT_SYMBOL(ieee80211_beacon_get_tim);
2450

2451 2452 2453 2454 2455 2456 2457 2458 2459 2460 2461 2462 2463 2464 2465 2466 2467 2468 2469 2470 2471 2472 2473 2474 2475 2476 2477 2478 2479 2480 2481
struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw,
					struct ieee80211_vif *vif)
{
	struct ieee80211_if_ap *ap = NULL;
	struct sk_buff *presp = NULL, *skb = NULL;
	struct ieee80211_hdr *hdr;
	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);

	if (sdata->vif.type != NL80211_IFTYPE_AP)
		return NULL;

	rcu_read_lock();

	ap = &sdata->u.ap;
	presp = rcu_dereference(ap->probe_resp);
	if (!presp)
		goto out;

	skb = skb_copy(presp, GFP_ATOMIC);
	if (!skb)
		goto out;

	hdr = (struct ieee80211_hdr *) skb->data;
	memset(hdr->addr1, 0, sizeof(hdr->addr1));

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

2482 2483 2484 2485 2486 2487 2488 2489 2490 2491 2492 2493 2494 2495 2496 2497 2498
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));
2499
	if (!skb)
2500
		return NULL;
2501

2502 2503 2504 2505 2506 2507 2508 2509 2510 2511 2512 2513 2514 2515 2516 2517 2518 2519 2520 2521 2522 2523 2524 2525 2526 2527 2528 2529 2530 2531 2532 2533 2534 2535 2536
	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));
2537
	if (!skb)
2538
		return NULL;
2539

2540 2541 2542 2543 2544 2545 2546 2547 2548 2549 2550 2551 2552 2553 2554 2555
	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);

2556 2557 2558 2559 2560 2561 2562 2563 2564 2565 2566 2567 2568 2569 2570 2571 2572 2573
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);
2574
	if (!skb)
2575 2576 2577 2578 2579 2580 2581 2582 2583 2584 2585 2586 2587 2588 2589 2590 2591 2592 2593 2594 2595 2596 2597 2598 2599 2600 2601 2602
		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);

2603
void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
2604
		       const void *frame, size_t frame_len,
2605
		       const struct ieee80211_tx_info *frame_txctl,
2606 2607 2608 2609
		       struct ieee80211_rts *rts)
{
	const struct ieee80211_hdr *hdr = frame;

2610 2611
	rts->frame_control =
	    cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
2612 2613
	rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
					       frame_txctl);
2614 2615 2616 2617 2618
	memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
	memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
}
EXPORT_SYMBOL(ieee80211_rts_get);

2619
void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
2620
			     const void *frame, size_t frame_len,
2621
			     const struct ieee80211_tx_info *frame_txctl,
2622 2623 2624 2625
			     struct ieee80211_cts *cts)
{
	const struct ieee80211_hdr *hdr = frame;

2626 2627
	cts->frame_control =
	    cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
2628 2629
	cts->duration = ieee80211_ctstoself_duration(hw, vif,
						     frame_len, frame_txctl);
2630 2631 2632 2633 2634
	memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
}
EXPORT_SYMBOL(ieee80211_ctstoself_get);

struct sk_buff *
2635
ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
2636
			  struct ieee80211_vif *vif)
2637 2638
{
	struct ieee80211_local *local = hw_to_local(hw);
2639
	struct sk_buff *skb = NULL;
2640
	struct ieee80211_tx_data tx;
2641 2642
	struct ieee80211_sub_if_data *sdata;
	struct ieee80211_if_ap *bss = NULL;
2643
	struct beacon_data *beacon;
2644
	struct ieee80211_tx_info *info;
2645

2646
	sdata = vif_to_sdata(vif);
2647
	bss = &sdata->u.ap;
2648 2649 2650 2651

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

2652
	if (sdata->vif.type != NL80211_IFTYPE_AP || !beacon || !beacon->head)
2653
		goto out;
2654

2655
	if (bss->dtim_count != 0 || !bss->dtim_bc_mc)
2656
		goto out; /* send buffered bc/mc only after DTIM beacon */
2657

2658 2659 2660
	while (1) {
		skb = skb_dequeue(&bss->ps_bc_buf);
		if (!skb)
2661
			goto out;
2662 2663 2664 2665 2666 2667 2668 2669 2670 2671 2672 2673
		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
2674
		if (!ieee80211_tx_prepare(sdata, &tx, skb))
2675 2676 2677
			break;
		dev_kfree_skb_any(skb);
	}
2678 2679 2680

	info = IEEE80211_SKB_CB(skb);

2681 2682
	tx.flags |= IEEE80211_TX_PS_BUFFERED;
	tx.channel = local->hw.conf.channel;
2683
	info->band = tx.channel->band;
2684

2685
	if (invoke_tx_handlers(&tx))
2686
		skb = NULL;
2687
 out:
2688
	rcu_read_unlock();
2689 2690 2691 2692

	return skb;
}
EXPORT_SYMBOL(ieee80211_get_buffered_bc);
J
Johannes Berg 已提交
2693

2694
void ieee80211_tx_skb(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
J
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{
	skb_set_mac_header(skb, 0);
	skb_set_network_header(skb, 0);
	skb_set_transport_header(skb, 0);

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	/* Send all internal mgmt frames on VO. Accordingly set TID to 7. */
	skb_set_queue_mapping(skb, IEEE80211_AC_VO);
	skb->priority = 7;
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	/*
	 * 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();
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	ieee80211_xmit(sdata, skb);
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	local_bh_enable();
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}