tx.c 74.6 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;
	}

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	/* Don't calculate ACKs for QoS Frames with NoAck Policy set */
	if (ieee80211_is_data_qos(hdr->frame_control) &&
	    *(ieee80211_get_qos_ctl(hdr)) | IEEE80211_QOS_CTL_ACK_POLICY_NOACK)
		dur = 0;
	else
		/* 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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			     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;
553 554 555 556 557
	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)))
558
		tx->key = key;
559
	else if (tx->sdata->drop_unencrypted &&
560
		 (tx->skb->protocol != tx->sdata->control_port_protocol) &&
561 562 563
		 !(info->flags & IEEE80211_TX_CTL_INJECTED) &&
		 (!ieee80211_is_robust_mgmt_frame(hdr) ||
		  (ieee80211_is_action(hdr->frame_control) &&
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564
		   tx->sta && test_sta_flag(tx->sta, WLAN_STA_MFP)))) {
565
		I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted);
566
		return TX_DROP;
567
	} else
568 569 570
		tx->key = NULL;

	if (tx->key) {
571 572
		bool skip_hw = false;

573
		tx->key->tx_rx_count++;
574
		/* TODO: add threshold stuff again */
575

576 577 578 579
		switch (tx->key->conf.cipher) {
		case WLAN_CIPHER_SUITE_WEP40:
		case WLAN_CIPHER_SUITE_WEP104:
		case WLAN_CIPHER_SUITE_TKIP:
580
			if (!ieee80211_is_data_present(hdr->frame_control))
581 582
				tx->key = NULL;
			break;
583
		case WLAN_CIPHER_SUITE_CCMP:
584 585 586 587
			if (!ieee80211_is_data_present(hdr->frame_control) &&
			    !ieee80211_use_mfp(hdr->frame_control, tx->sta,
					       tx->skb))
				tx->key = NULL;
588 589 590 591
			else
				skip_hw = (tx->key->conf.flags &
					   IEEE80211_KEY_FLAG_SW_MGMT) &&
					ieee80211_is_mgmt(hdr->frame_control);
592
			break;
593
		case WLAN_CIPHER_SUITE_AES_CMAC:
594 595 596
			if (!ieee80211_is_mgmt(hdr->frame_control))
				tx->key = NULL;
			break;
597
		}
598

599 600 601
		if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED))
			return TX_DROP;

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602
		if (!skip_hw && tx->key &&
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603
		    tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
604
			info->control.hw_key = &tx->key->conf;
605 606
	}

607
	return TX_CONTINUE;
608 609
}

610
static ieee80211_tx_result debug_noinline
611
ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
612
{
613
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
614 615 616
	struct ieee80211_hdr *hdr = (void *)tx->skb->data;
	struct ieee80211_supported_band *sband;
	struct ieee80211_rate *rate;
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617 618
	int i;
	u32 len;
619 620
	bool inval = false, rts = false, short_preamble = false;
	struct ieee80211_tx_rate_control txrc;
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621
	bool assoc = false;
622

623
	memset(&txrc, 0, sizeof(txrc));
624

625
	sband = tx->local->hw.wiphy->bands[tx->channel->band];
626

S
Shanyu Zhao 已提交
627
	len = min_t(u32, tx->skb->len + FCS_LEN,
628
			 tx->local->hw.wiphy->frag_threshold);
629 630 631 632 633 634 635

	/* 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;
636 637 638 639 640
	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;
641
	txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
642
		    tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT ||
643
		    tx->sdata->vif.type == NL80211_IFTYPE_ADHOC);
644 645

	/* set up RTS protection if desired */
646
	if (len > tx->local->hw.wiphy->rts_threshold) {
647
		txrc.rts = rts = true;
648 649
	}

650 651 652 653 654 655 656 657
	/*
	 * 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))))
659
		txrc.short_preamble = short_preamble = true;
660

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661 662
	if (tx->sta)
		assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
663 664 665 666 667

	/*
	 * Lets not bother rate control if we're associated and cannot
	 * talk to the sta. This should not happen.
	 */
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668
	if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc &&
669 670 671 672
		 !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",
673
		 tx->sdata->name, hdr->addr1,
674 675
		 tx->channel->band ? 5 : 2))
		return TX_DROP;
676

677 678 679 680
	/*
	 * If we're associated with the sta at this point we know we can at
	 * least send the frame at the lowest bit rate.
	 */
681 682 683 684 685
	rate_control_get_rate(tx->sdata, tx->sta, &txrc);

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

686
	if (txrc.reported_rate.idx < 0) {
687
		txrc.reported_rate = info->control.rates[0];
688 689 690
		if (tx->sta && ieee80211_is_data(hdr->frame_control))
			tx->sta->last_tx_rate = txrc.reported_rate;
	} else if (tx->sta)
691
		tx->sta->last_tx_rate = txrc.reported_rate;
692

693 694
	if (unlikely(!info->control.rates[0].count))
		info->control.rates[0].count = 1;
695

696 697 698 699
	if (WARN_ON_ONCE((info->control.rates[0].count > 1) &&
			 (info->flags & IEEE80211_TX_CTL_NO_ACK)))
		info->control.rates[0].count = 1;

700 701 702 703 704
	if (is_multicast_ether_addr(hdr->addr1)) {
		/*
		 * XXX: verify the rate is in the basic rateset
		 */
		return TX_CONTINUE;
705 706
	}

707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731
	/*
	 * 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;
732 733
	}

734 735 736 737 738 739 740 741 742 743 744 745 746 747
	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;
		}
748

749 750 751 752 753 754 755 756
		/*
		 * 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;
		}
757

758 759 760 761
		/* set up RTS protection if desired */
		if (rts)
			info->control.rates[i].flags |=
				IEEE80211_TX_RC_USE_RTS_CTS;
762

763
		/* RC is busted */
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Sujith 已提交
764 765
		if (WARN_ON_ONCE(info->control.rates[i].idx >=
				 sband->n_bitrates)) {
766 767
			info->control.rates[i].idx = -1;
			continue;
768
		}
769

770 771 772 773 774 775 776 777 778 779 780 781 782
		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;
783 784
	}

785 786 787
	return TX_CONTINUE;
}

788 789 790 791 792 793 794 795 796
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;

797 798 799 800 801
	/*
	 * 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.
	 */
802
	if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR))
803 804
		return TX_CONTINUE;

805 806 807 808 809 810
	if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
		return TX_CONTINUE;

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

811 812 813
	if (ieee80211_is_qos_nullfunc(hdr->frame_control))
		return TX_CONTINUE;

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814 815 816 817 818
	/*
	 * Anything but QoS data that has a sequence number field
	 * (is long enough) gets a sequence number from the global
	 * counter.
	 */
819
	if (!ieee80211_is_data_qos(hdr->frame_control)) {
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820
		/* driver should assign sequence number */
821
		info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
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822 823 824
		/* 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;
825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849
		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;
}

850
static int ieee80211_fragment(struct ieee80211_tx_data *tx,
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851 852 853
			      struct sk_buff *skb, int hdrlen,
			      int frag_threshold)
{
854
	struct ieee80211_local *local = tx->local;
855
	struct ieee80211_tx_info *info;
856
	struct sk_buff *tmp;
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857 858 859 860 861 862 863
	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;

864 865
	/* first fragment was already added to queue by caller */

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866 867 868 869 870 871 872 873 874 875 876 877
	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;
878 879 880

		__skb_queue_tail(&tx->skbs, tmp);

J
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881 882 883 884
		skb_reserve(tmp, local->tx_headroom +
				 IEEE80211_ENCRYPT_HEADROOM);
		/* copy control information */
		memcpy(tmp->cb, skb->cb, sizeof(tmp->cb));
885 886 887 888 889 890 891 892

		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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893 894 895 896 897 898 899 900 901 902 903
		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;
	}

904
	/* adjust first fragment's length */
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905 906 907 908
	skb->len = hdrlen + per_fragm;
	return 0;
}

909
static ieee80211_tx_result debug_noinline
910 911
ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
{
J
Johannes Berg 已提交
912 913 914
	struct sk_buff *skb = tx->skb;
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
	struct ieee80211_hdr *hdr = (void *)skb->data;
915
	int frag_threshold = tx->local->hw.wiphy->frag_threshold;
J
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916 917
	int hdrlen;
	int fragnum;
918

919 920 921 922
	/* no matter what happens, tx->skb moves to tx->skbs */
	__skb_queue_tail(&tx->skbs, skb);
	tx->skb = NULL;

923 924 925 926
	if (info->flags & IEEE80211_TX_CTL_DONTFRAG)
		return TX_CONTINUE;

	if (tx->local->ops->set_frag_threshold)
927 928
		return TX_CONTINUE;

929 930
	/*
	 * Warn when submitting a fragmented A-MPDU frame and drop it.
J
Johannes Berg 已提交
931
	 * This scenario is handled in ieee80211_tx_prepare but extra
932
	 * caution taken here as fragmented ampdu may cause Tx stop.
933
	 */
S
Sujith 已提交
934
	if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
935 936
		return TX_DROP;

937
	hdrlen = ieee80211_hdrlen(hdr->frame_control);
938

939
	/* internal error, why isn't DONTFRAG set? */
940
	if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))
J
Johannes Berg 已提交
941
		return TX_DROP;
942

J
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943 944 945 946 947 948 949 950
	/*
	 * 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.
	 */
951
	if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold))
J
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952
		return TX_DROP;
953

J
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954 955
	/* update duration/seq/flags of fragments */
	fragnum = 0;
956 957

	skb_queue_walk(&tx->skbs, skb) {
J
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958 959
		int next_len;
		const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
960

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961 962
		hdr = (void *)skb->data;
		info = IEEE80211_SKB_CB(skb);
963

964
		if (!skb_queue_is_last(&tx->skbs, skb)) {
J
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965
			hdr->frame_control |= morefrags;
966 967 968 969 970 971 972 973 974 975
			/*
			 * 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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976 977 978
		} else {
			hdr->frame_control &= ~morefrags;
			next_len = 0;
979
		}
J
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980 981
		hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG);
		fragnum++;
982
	}
983

984
	return TX_CONTINUE;
985 986
}

987 988 989
static ieee80211_tx_result debug_noinline
ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
{
990
	struct sk_buff *skb;
991 992 993 994 995

	if (!tx->sta)
		return TX_CONTINUE;

	tx->sta->tx_packets++;
996
	skb_queue_walk(&tx->skbs, skb) {
997 998
		tx->sta->tx_fragments++;
		tx->sta->tx_bytes += skb->len;
999
	}
1000 1001 1002 1003

	return TX_CONTINUE;
}

1004
static ieee80211_tx_result debug_noinline
1005 1006
ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
{
1007 1008
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);

1009 1010 1011
	if (!tx->key)
		return TX_CONTINUE;

1012 1013 1014
	switch (tx->key->conf.cipher) {
	case WLAN_CIPHER_SUITE_WEP40:
	case WLAN_CIPHER_SUITE_WEP104:
1015
		return ieee80211_crypto_wep_encrypt(tx);
1016
	case WLAN_CIPHER_SUITE_TKIP:
1017
		return ieee80211_crypto_tkip_encrypt(tx);
1018
	case WLAN_CIPHER_SUITE_CCMP:
1019
		return ieee80211_crypto_ccmp_encrypt(tx);
1020
	case WLAN_CIPHER_SUITE_AES_CMAC:
1021
		return ieee80211_crypto_aes_cmac_encrypt(tx);
1022 1023 1024 1025 1026 1027 1028 1029
	default:
		/* handle hw-only algorithm */
		if (info->control.hw_key) {
			ieee80211_tx_set_protected(tx);
			return TX_CONTINUE;
		}
		break;

1030 1031 1032 1033 1034
	}

	return TX_DROP;
}

1035
static ieee80211_tx_result debug_noinline
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1036 1037
ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
{
1038
	struct sk_buff *skb;
J
Johannes Berg 已提交
1039 1040 1041
	struct ieee80211_hdr *hdr;
	int next_len;
	bool group_addr;
J
Johannes Berg 已提交
1042

1043
	skb_queue_walk(&tx->skbs, skb) {
J
Johannes Berg 已提交
1044
		hdr = (void *) skb->data;
1045 1046
		if (unlikely(ieee80211_is_pspoll(hdr->frame_control)))
			break; /* must not overwrite AID */
1047 1048 1049 1050 1051
		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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1052
		group_addr = is_multicast_ether_addr(hdr->addr1);
J
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1053

J
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1054
		hdr->duration_id =
1055 1056
			ieee80211_duration(tx, skb, group_addr, next_len);
	}
J
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1057 1058 1059 1060

	return TX_CONTINUE;
}

1061 1062
/* actual transmit path */

1063 1064 1065 1066 1067 1068 1069
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;
1070
	bool reset_agg_timer = false;
1071 1072 1073

	if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
		info->flags |= IEEE80211_TX_CTL_AMPDU;
1074
		reset_agg_timer = true;
1075 1076 1077 1078 1079
	} 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
		 */
1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099
	} 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
1100
		tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid);
1101 1102 1103 1104 1105

		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;
1106
			reset_agg_timer = true;
1107 1108 1109 1110 1111 1112 1113 1114 1115
		} 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);
	}

1116 1117 1118 1119 1120
	/* reset session timer */
	if (reset_agg_timer && tid_tx->timeout)
		mod_timer(&tid_tx->session_timer,
			  TU_TO_EXP_TIME(tid_tx->timeout));

1121 1122 1123
	return queued;
}

1124 1125 1126
/*
 * initialises @tx
 */
1127
static ieee80211_tx_result
J
Johannes Berg 已提交
1128 1129 1130
ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
		     struct ieee80211_tx_data *tx,
		     struct sk_buff *skb)
1131
{
J
Johannes Berg 已提交
1132
	struct ieee80211_local *local = sdata->local;
1133
	struct ieee80211_hdr *hdr;
1134
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
J
Johannes Berg 已提交
1135
	int tid;
1136
	u8 *qc;
1137 1138 1139 1140

	memset(tx, 0, sizeof(*tx));
	tx->skb = skb;
	tx->local = local;
J
Johannes Berg 已提交
1141
	tx->sdata = sdata;
1142
	tx->channel = local->hw.conf.channel;
1143
	__skb_queue_head_init(&tx->skbs);
1144

1145 1146 1147 1148 1149 1150 1151
	/*
	 * 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;

1152 1153
	hdr = (struct ieee80211_hdr *) skb->data;

1154
	if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1155
		tx->sta = rcu_dereference(sdata->u.vlan.sta);
1156 1157
		if (!tx->sta && sdata->dev->ieee80211_ptr->use_4addr)
			return TX_DROP;
1158 1159
	} else if (info->flags & IEEE80211_TX_CTL_INJECTED) {
		tx->sta = sta_info_get_bss(sdata, hdr->addr1);
1160
	}
1161
	if (!tx->sta)
1162
		tx->sta = sta_info_get(sdata, hdr->addr1);
1163

1164
	if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) &&
1165
	    !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
1166 1167
	    (local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION) &&
	    !(local->hw.flags & IEEE80211_HW_TX_AMPDU_SETUP_IN_HW)) {
1168 1169
		struct tid_ampdu_tx *tid_tx;

S
Sujith 已提交
1170 1171 1172
		qc = ieee80211_get_qos_ctl(hdr);
		tid = *qc & IEEE80211_QOS_CTL_TID_MASK;

1173 1174 1175
		tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
		if (tid_tx) {
			bool queued;
1176

1177 1178 1179 1180 1181 1182
			queued = ieee80211_tx_prep_agg(tx, skb, info,
						       tid_tx, tid);

			if (unlikely(queued))
				return TX_QUEUED;
		}
S
Sujith 已提交
1183 1184
	}

1185
	if (is_multicast_ether_addr(hdr->addr1)) {
1186
		tx->flags &= ~IEEE80211_TX_UNICAST;
1187
		info->flags |= IEEE80211_TX_CTL_NO_ACK;
1188
	} else
1189
		tx->flags |= IEEE80211_TX_UNICAST;
1190

1191 1192 1193 1194 1195
	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;
1196 1197
	}

1198
	if (!tx->sta)
1199
		info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
J
Johannes Berg 已提交
1200
	else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT))
1201
		info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1202

1203
	info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
1204

1205
	return TX_CONTINUE;
1206 1207
}

1208 1209 1210 1211 1212
static bool ieee80211_tx_frags(struct ieee80211_local *local,
			       struct ieee80211_vif *vif,
			       struct ieee80211_sta *sta,
			       struct sk_buff_head *skbs,
			       bool txpending)
1213
{
1214
	struct sk_buff *skb, *tmp;
1215
	struct ieee80211_tx_info *info;
J
Johannes Berg 已提交
1216
	unsigned long flags;
1217

1218
	skb_queue_walk_safe(skbs, skb, tmp) {
J
Johannes Berg 已提交
1219 1220 1221 1222
		int q = skb_get_queue_mapping(skb);

		spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
		if (local->queue_stop_reasons[q] ||
1223 1224 1225 1226 1227 1228
		    (!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.
			 */
1229
			if (txpending)
J
Johannes Berg 已提交
1230
				skb_queue_splice_init(skbs, &local->pending[q]);
1231
			else
J
Johannes Berg 已提交
1232 1233
				skb_queue_splice_tail_init(skbs,
							   &local->pending[q]);
1234 1235 1236 1237 1238

			spin_unlock_irqrestore(&local->queue_stop_reason_lock,
					       flags);
			return false;
		}
J
Johannes Berg 已提交
1239
		spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1240

1241
		info = IEEE80211_SKB_CB(skb);
1242 1243
		info->control.vif = vif;
		info->control.sta = sta;
1244

1245 1246 1247
		__skb_unlink(skb, skbs);
		drv_tx(local, skb);
	}
1248

1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265
	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;
1266

1267 1268
	if (WARN_ON(skb_queue_empty(skbs)))
		return true;
J
Johannes Berg 已提交
1269

1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293
	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;
1294
	}
J
Johannes Berg 已提交
1295

1296 1297 1298 1299 1300 1301
	if (local->ops->tx_frags)
		drv_tx_frags(local, vif, pubsta, skbs);
	else
		result = ieee80211_tx_frags(local, vif, pubsta, skbs,
					    txpending);

1302 1303 1304
	ieee80211_tpt_led_trig_tx(local, fc, led_len);
	ieee80211_led_tx(local, 1);

J
Johannes Berg 已提交
1305
	WARN_ON_ONCE(!skb_queue_empty(skbs));
1306

1307
	return result;
1308 1309
}

1310 1311 1312 1313 1314 1315
/*
 * 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)
{
1316
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
1317 1318
	ieee80211_tx_result res = TX_DROP;

1319 1320 1321 1322 1323 1324 1325
#define CALL_TXH(txh) \
	do {				\
		res = txh(tx);		\
		if (res != TX_CONTINUE)	\
			goto txh_done;	\
	} while (0)

1326
	CALL_TXH(ieee80211_tx_h_dynamic_ps);
1327 1328
	CALL_TXH(ieee80211_tx_h_check_assoc);
	CALL_TXH(ieee80211_tx_h_ps_buf);
1329
	CALL_TXH(ieee80211_tx_h_check_control_port_protocol);
1330
	CALL_TXH(ieee80211_tx_h_select_key);
1331 1332
	if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
		CALL_TXH(ieee80211_tx_h_rate_ctrl);
1333

J
Johannes Berg 已提交
1334 1335 1336
	if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) {
		__skb_queue_tail(&tx->skbs, tx->skb);
		tx->skb = NULL;
1337
		goto txh_done;
J
Johannes Berg 已提交
1338
	}
1339 1340

	CALL_TXH(ieee80211_tx_h_michael_mic_add);
1341 1342
	CALL_TXH(ieee80211_tx_h_sequence);
	CALL_TXH(ieee80211_tx_h_fragment);
1343
	/* handlers after fragment must be aware of tx info fragmentation! */
1344 1345
	CALL_TXH(ieee80211_tx_h_stats);
	CALL_TXH(ieee80211_tx_h_encrypt);
1346 1347
	if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
		CALL_TXH(ieee80211_tx_h_calculate_duration);
1348
#undef CALL_TXH
1349

1350
 txh_done:
1351
	if (unlikely(res == TX_DROP)) {
1352
		I802_DEBUG_INC(tx->local->tx_handlers_drop);
1353 1354 1355 1356
		if (tx->skb)
			dev_kfree_skb(tx->skb);
		else
			__skb_queue_purge(&tx->skbs);
1357 1358
		return -1;
	} else if (unlikely(res == TX_QUEUED)) {
1359
		I802_DEBUG_INC(tx->local->tx_handlers_queued);
1360 1361 1362 1363 1364 1365
		return -1;
	}

	return 0;
}

1366 1367 1368 1369
/*
 * 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
1370
			 struct sk_buff *skb, bool txpending)
1371
{
J
Johannes Berg 已提交
1372
	struct ieee80211_local *local = sdata->local;
1373
	struct ieee80211_tx_data tx;
1374
	ieee80211_tx_result res_prepare;
1375
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1376
	bool result = true;
1377
	int led_len;
1378 1379 1380

	if (unlikely(skb->len < 10)) {
		dev_kfree_skb(skb);
1381
		return true;
1382 1383
	}

1384 1385
	rcu_read_lock();

1386
	/* initialises tx */
1387
	led_len = skb->len;
J
Johannes Berg 已提交
1388
	res_prepare = ieee80211_tx_prepare(sdata, &tx, skb);
1389

1390
	if (unlikely(res_prepare == TX_DROP)) {
1391
		dev_kfree_skb(skb);
1392
		goto out;
1393
	} else if (unlikely(res_prepare == TX_QUEUED)) {
1394
		goto out;
1395 1396
	}

1397
	tx.channel = local->hw.conf.channel;
1398
	info->band = tx.channel->band;
1399

1400
	if (!invoke_tx_handlers(&tx))
1401 1402
		result = __ieee80211_tx(local, &tx.skbs, led_len,
					tx.sta, txpending);
1403
 out:
1404
	rcu_read_unlock();
1405
	return result;
1406 1407 1408 1409
}

/* device xmit handlers */

1410
static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata,
1411 1412 1413
				struct sk_buff *skb,
				int head_need, bool may_encrypt)
{
1414
	struct ieee80211_local *local = sdata->local;
1415 1416
	int tail_need = 0;

1417
	if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) {
1418 1419 1420 1421 1422
		tail_need = IEEE80211_ENCRYPT_TAILROOM;
		tail_need -= skb_tailroom(skb);
		tail_need = max_t(int, tail_need, 0);
	}

1423
	if (skb_cloned(skb))
1424
		I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1425
	else if (head_need || tail_need)
1426
		I802_DEBUG_INC(local->tx_expand_skb_head);
1427 1428
	else
		return 0;
1429 1430

	if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
J
Joe Perches 已提交
1431 1432
		wiphy_debug(local->hw.wiphy,
			    "failed to reallocate TX buffer\n");
1433 1434 1435 1436 1437 1438
		return -ENOMEM;
	}

	return 0;
}

1439
void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
1440
{
J
Johannes Berg 已提交
1441
	struct ieee80211_local *local = sdata->local;
1442
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1443
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1444
	int headroom;
1445
	bool may_encrypt;
1446

1447 1448
	rcu_read_lock();

J
Johannes Berg 已提交
1449
	may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT);
1450

J
Johannes Berg 已提交
1451
	headroom = local->tx_headroom;
1452 1453 1454 1455 1456
	if (may_encrypt)
		headroom += IEEE80211_ENCRYPT_HEADROOM;
	headroom -= skb_headroom(skb);
	headroom = max_t(int, 0, headroom);

1457
	if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) {
1458
		dev_kfree_skb(skb);
1459
		rcu_read_unlock();
J
Johannes Berg 已提交
1460
		return;
1461 1462
	}

1463
	hdr = (struct ieee80211_hdr *) skb->data;
1464
	info->control.vif = &sdata->vif;
1465

1466 1467 1468
	if (ieee80211_vif_is_mesh(&sdata->vif) &&
	    ieee80211_is_data(hdr->frame_control) &&
		!is_multicast_ether_addr(hdr->addr1))
1469
			if (mesh_nexthop_resolve(skb, sdata)) {
1470
				/* skb queued: don't free */
1471
				rcu_read_unlock();
1472 1473 1474
				return;
			}

1475
	ieee80211_set_qos_hdr(sdata, skb);
J
Johannes Berg 已提交
1476
	ieee80211_tx(sdata, skb, false);
1477
	rcu_read_unlock();
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 1555 1556 1557 1558 1559 1560 1561 1562
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;
}

1563 1564
netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
					 struct net_device *dev)
1565 1566
{
	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1567
	struct ieee80211_channel *chan = local->hw.conf.channel;
1568 1569
	struct ieee80211_radiotap_header *prthdr =
		(struct ieee80211_radiotap_header *)skb->data;
J
Johannes Berg 已提交
1570
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1571
	struct ieee80211_hdr *hdr;
J
Johannes Berg 已提交
1572
	struct ieee80211_sub_if_data *tmp_sdata, *sdata;
1573
	u16 len_rthdr;
J
Johannes Berg 已提交
1574
	int hdrlen;
1575

1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595
	/*
	 * 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;

1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609
	/* 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 */
1610 1611 1612 1613 1614 1615 1616

	/*
	 * 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
	 */
1617
	skb_set_mac_header(skb, len_rthdr);
1618
	/*
1619 1620
	 * 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
1621
	 */
1622 1623
	skb_set_network_header(skb, len_rthdr);
	skb_set_transport_header(skb, len_rthdr);
1624

J
Johannes Berg 已提交
1625 1626 1627 1628 1629 1630 1631 1632 1633
	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;

1634 1635 1636 1637
	/*
	 * Initialize skb->protocol if the injected frame is a data frame
	 * carrying a rfc1042 header
	 */
J
Johannes Berg 已提交
1638 1639 1640 1641 1642 1643 1644
	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]);
1645 1646
	}

J
Johannes Berg 已提交
1647 1648
	memset(info, 0, sizeof(*info));

J
Johannes Berg 已提交
1649
	info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
1650 1651 1652 1653 1654
		      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
1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679

	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;
		}
	}
1680

J
Johannes Berg 已提交
1681 1682 1683
	ieee80211_xmit(sdata, skb);
	rcu_read_unlock();

1684
	return NETDEV_TX_OK;
1685 1686 1687 1688

fail:
	dev_kfree_skb(skb);
	return NETDEV_TX_OK; /* meaning, we dealt with the skb */
1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705
}

/**
 * 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).
 */
1706 1707
netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
				    struct net_device *dev)
1708
{
1709 1710
	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
	struct ieee80211_local *local = sdata->local;
1711
	struct ieee80211_tx_info *info;
1712
	int ret = NETDEV_TX_BUSY, head_need;
1713 1714
	u16 ethertype, hdrlen,  meshhdrlen = 0;
	__le16 fc;
1715
	struct ieee80211_hdr hdr;
1716
	struct ieee80211s_hdr mesh_hdr __maybe_unused;
1717
	struct mesh_path __maybe_unused *mppath = NULL;
1718 1719
	const u8 *encaps_data;
	int encaps_len, skip_header_bytes;
1720
	int nh_pos, h_pos;
1721
	struct sta_info *sta = NULL;
J
Johannes Berg 已提交
1722
	bool wme_sta = false, authorized = false, tdls_auth = false;
1723
	bool tdls_direct = false;
J
Johannes Berg 已提交
1724 1725 1726
	bool multicast;
	u32 info_flags = 0;
	u16 info_id = 0;
1727 1728

	if (unlikely(skb->len < ETH_HLEN)) {
1729
		ret = NETDEV_TX_OK;
1730 1731 1732 1733 1734 1735
		goto fail;
	}

	/* convert Ethernet header to proper 802.11 header (based on
	 * operation mode) */
	ethertype = (skb->data[12] << 8) | skb->data[13];
1736
	fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
1737

1738
	switch (sdata->vif.type) {
1739
	case NL80211_IFTYPE_AP_VLAN:
1740
		rcu_read_lock();
1741
		sta = rcu_dereference(sdata->u.vlan.sta);
1742 1743 1744 1745
		if (sta) {
			fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
			/* RA TA DA SA */
			memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN);
1746
			memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1747 1748 1749
			memcpy(hdr.addr3, skb->data, ETH_ALEN);
			memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
			hdrlen = 30;
J
Johannes Berg 已提交
1750 1751
			authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
			wme_sta = test_sta_flag(sta, WLAN_STA_WME);
1752 1753 1754 1755 1756 1757
		}
		rcu_read_unlock();
		if (sta)
			break;
		/* fall through */
	case NL80211_IFTYPE_AP:
1758
		fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
1759 1760
		/* DA BSSID SA */
		memcpy(hdr.addr1, skb->data, ETH_ALEN);
1761
		memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1762 1763
		memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
		hdrlen = 24;
1764
		break;
1765
	case NL80211_IFTYPE_WDS:
1766
		fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1767 1768
		/* RA TA DA SA */
		memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
1769
		memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1770 1771 1772
		memcpy(hdr.addr3, skb->data, ETH_ALEN);
		memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
		hdrlen = 30;
1773
		break;
1774
#ifdef CONFIG_MAC80211_MESH
1775
	case NL80211_IFTYPE_MESH_POINT:
1776
		if (!sdata->u.mesh.mshcfg.dot11MeshTTL) {
1777
			/* Do not send frames with mesh_ttl == 0 */
1778
			sdata->u.mesh.mshstats.dropped_frames_ttl++;
1779
			ret = NETDEV_TX_OK;
1780
			goto fail;
1781
		}
1782
		rcu_read_lock();
1783 1784
		if (!is_multicast_ether_addr(skb->data))
			mppath = mpp_path_lookup(skb->data, sdata);
1785

1786
		/*
1787 1788 1789 1790
		 * 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)
1791
		 */
1792
		if (compare_ether_addr(sdata->vif.addr,
1793
				       skb->data + ETH_ALEN) == 0 &&
1794
		    !(mppath && compare_ether_addr(mppath->mpp, skb->data))) {
1795 1796
			hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
					skb->data, skb->data + ETH_ALEN);
1797
			rcu_read_unlock();
1798
			meshhdrlen = ieee80211_new_mesh_header(&mesh_hdr,
1799
					sdata, NULL, NULL);
1800
		} else {
1801
			int is_mesh_mcast = 1;
1802
			const u8 *mesh_da;
1803 1804

			if (is_multicast_ether_addr(skb->data))
1805 1806
				/* DA TA mSA AE:SA */
				mesh_da = skb->data;
1807
			else {
1808 1809
				static const u8 bcast[ETH_ALEN] =
					{ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
1810 1811 1812 1813
				if (mppath) {
					/* RA TA mDA mSA AE:DA SA */
					mesh_da = mppath->mpp;
					is_mesh_mcast = 0;
1814
				} else {
1815
					/* DA TA mSA AE:SA */
1816 1817
					mesh_da = bcast;
				}
1818
			}
1819
			hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
1820
					mesh_da, sdata->vif.addr);
1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833
			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);
1834 1835

		}
1836 1837
		break;
#endif
1838
	case NL80211_IFTYPE_STATION:
1839
		if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
J
Johannes Berg 已提交
1840 1841
			bool tdls_peer = false;

1842 1843
			rcu_read_lock();
			sta = sta_info_get(sdata, skb->data);
J
Johannes Berg 已提交
1844 1845 1846 1847 1848 1849 1850 1851 1852
			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);
			}
1853 1854 1855 1856 1857 1858 1859
			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
1860
			tdls_direct = tdls_peer && (tdls_auth ||
1861 1862 1863 1864 1865 1866
				 !(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
1867
			if (!tdls_auth) {
1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880
				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);
1881
			/* RA TA DA SA */
1882
			memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
1883
			memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1884 1885 1886 1887 1888 1889
			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 */
1890
			memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
1891 1892 1893 1894
			memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
			memcpy(hdr.addr3, skb->data, ETH_ALEN);
			hdrlen = 24;
		}
1895
		break;
1896
	case NL80211_IFTYPE_ADHOC:
1897 1898 1899
		/* DA SA BSSID */
		memcpy(hdr.addr1, skb->data, ETH_ALEN);
		memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1900
		memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN);
1901
		hdrlen = 24;
1902 1903
		break;
	default:
1904
		ret = NETDEV_TX_OK;
1905 1906 1907
		goto fail;
	}

1908 1909 1910 1911 1912
	/*
	 * 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
1913 1914
	multicast = is_multicast_ether_addr(hdr.addr1);
	if (!multicast) {
1915
		rcu_read_lock();
1916
		sta = sta_info_get(sdata, hdr.addr1);
J
Johannes Berg 已提交
1917 1918 1919 1920
		if (sta) {
			authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
			wme_sta = test_sta_flag(sta, WLAN_STA_WME);
		}
1921
		rcu_read_unlock();
1922 1923
	}

1924 1925
	/* For mesh, the use of the QoS header is mandatory */
	if (ieee80211_vif_is_mesh(&sdata->vif))
J
Johannes Berg 已提交
1926
		wme_sta = true;
1927

1928
	/* receiver and we are QoS enabled, use a QoS type frame */
J
Johannes Berg 已提交
1929
	if (wme_sta && local->hw.queues >= 4) {
1930
		fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
1931 1932 1933 1934
		hdrlen += 2;
	}

	/*
1935 1936
	 * Drop unicast frames to unauthorised stations unless they are
	 * EAPOL frames from the local station.
1937
	 */
1938 1939 1940 1941
	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)))) {
1942 1943
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
		if (net_ratelimit())
1944
			printk(KERN_DEBUG "%s: dropped frame to %pM"
1945
			       " (unauthorized port)\n", dev->name,
1946
			       hdr.addr1);
1947 1948 1949 1950
#endif

		I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);

1951
		ret = NETDEV_TX_OK;
1952 1953 1954
		goto fail;
	}

J
Johannes Berg 已提交
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 1986 1987 1988 1989 1990 1991 1992 1993
	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;
		}
	}

1994 1995 1996 1997
	/*
	 * If the skb is shared we need to obtain our own copy.
	 */
	if (skb_shared(skb)) {
J
Johannes Berg 已提交
1998 1999 2000 2001 2002
		struct sk_buff *tmp_skb = skb;

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

2003
		skb = skb_clone(skb, GFP_ATOMIC);
2004 2005 2006 2007 2008 2009 2010 2011
		kfree_skb(tmp_skb);

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

2012
	hdr.frame_control = fc;
2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029
	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;
	}

2030 2031 2032
	nh_pos = skb_network_header(skb) - skb->data;
	h_pos = skb_transport_header(skb) - skb->data;

2033 2034 2035 2036
	skb_pull(skb, skip_header_bytes);
	nh_pos -= skip_header_bytes;
	h_pos -= skip_header_bytes;

2037
	head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
2038

2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049
	/*
	 * 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.
	 */
2050

2051
	if (head_need > 0 || skb_cloned(skb)) {
2052 2053 2054
		head_need += IEEE80211_ENCRYPT_HEADROOM;
		head_need += local->tx_headroom;
		head_need = max_t(int, 0, head_need);
2055
		if (ieee80211_skb_resize(sdata, skb, head_need, true))
2056 2057 2058 2059 2060 2061 2062 2063
			goto fail;
	}

	if (encaps_data) {
		memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
		nh_pos += encaps_len;
		h_pos += encaps_len;
	}
2064

2065
#ifdef CONFIG_MAC80211_MESH
2066 2067 2068 2069 2070
	if (meshhdrlen > 0) {
		memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
		nh_pos += meshhdrlen;
		h_pos += meshhdrlen;
	}
2071
#endif
2072

2073
	if (ieee80211_is_data_qos(fc)) {
2074 2075 2076 2077 2078 2079 2080 2081 2082 2083 2084 2085
		__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);

2086 2087 2088
	nh_pos += hdrlen;
	h_pos += hdrlen;

2089 2090
	dev->stats.tx_packets++;
	dev->stats.tx_bytes += skb->len;
2091 2092 2093 2094 2095 2096 2097 2098

	/* 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);

2099
	info = IEEE80211_SKB_CB(skb);
J
Johannes Berg 已提交
2100 2101
	memset(info, 0, sizeof(*info));

2102
	dev->trans_start = jiffies;
J
Johannes Berg 已提交
2103 2104 2105 2106

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

J
Johannes Berg 已提交
2107
	ieee80211_xmit(sdata, skb);
2108

2109
	return NETDEV_TX_OK;
2110 2111

 fail:
2112
	if (ret == NETDEV_TX_OK)
2113 2114 2115 2116 2117 2118
		dev_kfree_skb(skb);

	return ret;
}


2119 2120 2121 2122
/*
 * ieee80211_clear_tx_pending may not be called in a context where
 * it is possible that it packets could come in again.
 */
2123 2124
void ieee80211_clear_tx_pending(struct ieee80211_local *local)
{
J
Johannes Berg 已提交
2125
	int i;
2126

2127 2128
	for (i = 0; i < local->hw.queues; i++)
		skb_queue_purge(&local->pending[i]);
2129 2130
}

2131 2132 2133 2134 2135
/*
 * 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.
 */
2136 2137 2138 2139 2140 2141 2142
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;
2143
	bool result;
2144

2145
	sdata = vif_to_sdata(info->control.vif);
2146 2147

	if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) {
2148
		result = ieee80211_tx(sdata, skb, true);
2149
	} else {
2150 2151 2152 2153 2154
		struct sk_buff_head skbs;

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

2155
		hdr = (struct ieee80211_hdr *)skb->data;
2156
		sta = sta_info_get(sdata, hdr->addr1);
2157

2158
		result = __ieee80211_tx(local, &skbs, skb->len, sta, true);
2159 2160 2161 2162 2163
	}

	return result;
}

2164
/*
J
Johannes Berg 已提交
2165
 * Transmit all pending packets. Called from tasklet.
2166
 */
2167 2168 2169
void ieee80211_tx_pending(unsigned long data)
{
	struct ieee80211_local *local = (struct ieee80211_local *)data;
2170
	struct ieee80211_sub_if_data *sdata;
2171
	unsigned long flags;
2172
	int i;
J
Johannes Berg 已提交
2173
	bool txok;
2174

2175
	rcu_read_lock();
2176

J
Johannes Berg 已提交
2177
	spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
2178 2179 2180 2181 2182
	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
2183
		if (local->queue_stop_reasons[i] ||
2184
		    skb_queue_empty(&local->pending[i]))
2185
			continue;
2186

2187
		while (!skb_queue_empty(&local->pending[i])) {
J
Johannes Berg 已提交
2188
			struct sk_buff *skb = __skb_dequeue(&local->pending[i]);
2189 2190
			struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);

2191 2192 2193 2194 2195
			if (WARN_ON(!info->control.vif)) {
				kfree_skb(skb);
				continue;
			}

J
Johannes Berg 已提交
2196 2197 2198 2199 2200 2201 2202
			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)
2203
				break;
2204
		}
2205 2206 2207

		if (skb_queue_empty(&local->pending[i]))
			list_for_each_entry_rcu(sdata, &local->interfaces, list)
J
Johannes Berg 已提交
2208
				netif_wake_subqueue(sdata->dev, i);
2209
	}
J
Johannes Berg 已提交
2210
	spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
2211

2212
	rcu_read_unlock();
2213 2214 2215 2216
}

/* functions for drivers to get certain frames */

R
Rami Rosen 已提交
2217
static void ieee80211_beacon_add_tim(struct ieee80211_if_ap *bss,
2218 2219
				     struct sk_buff *skb,
				     struct beacon_data *beacon)
2220 2221 2222 2223 2224 2225 2226 2227 2228 2229 2230 2231 2232 2233
{
	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)
2234
		bss->dtim_count = beacon->dtim_period - 1;
2235 2236 2237 2238 2239 2240 2241
	else
		bss->dtim_count--;

	tim = pos = (u8 *) skb_put(skb, 6);
	*pos++ = WLAN_EID_TIM;
	*pos++ = 4;
	*pos++ = bss->dtim_count;
2242
	*pos++ = beacon->dtim_period;
2243 2244 2245 2246

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

2247 2248
	bss->dtim_bc_mc = aid0 == 1;

2249 2250 2251 2252 2253 2254 2255 2256 2257 2258 2259 2260 2261 2262 2263 2264 2265 2266 2267 2268 2269 2270
	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 */
2271
		skb_put(skb, n2 - n1);
2272 2273 2274 2275 2276 2277 2278 2279 2280
		memcpy(pos, bss->tim + n1, n2 - n1 + 1);

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

2281 2282 2283
struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
					 struct ieee80211_vif *vif,
					 u16 *tim_offset, u16 *tim_length)
2284 2285
{
	struct ieee80211_local *local = hw_to_local(hw);
2286
	struct sk_buff *skb = NULL;
2287
	struct ieee80211_tx_info *info;
2288 2289
	struct ieee80211_sub_if_data *sdata = NULL;
	struct ieee80211_if_ap *ap = NULL;
2290
	struct beacon_data *beacon;
2291
	struct ieee80211_supported_band *sband;
2292
	enum ieee80211_band band = local->hw.conf.channel->band;
2293
	struct ieee80211_tx_rate_control txrc;
2294

2295
	sband = local->hw.wiphy->bands[band];
2296 2297

	rcu_read_lock();
2298

2299
	sdata = vif_to_sdata(vif);
2300

2301 2302 2303
	if (!ieee80211_sdata_running(sdata))
		goto out;

2304 2305 2306 2307 2308
	if (tim_offset)
		*tim_offset = 0;
	if (tim_length)
		*tim_length = 0;

2309
	if (sdata->vif.type == NL80211_IFTYPE_AP) {
2310 2311
		ap = &sdata->u.ap;
		beacon = rcu_dereference(ap->beacon);
D
Dan Carpenter 已提交
2312
		if (beacon) {
J
Johannes Berg 已提交
2313 2314 2315 2316 2317 2318 2319 2320 2321
			/*
			 * 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;
2322

J
Johannes Berg 已提交
2323 2324 2325
			skb_reserve(skb, local->tx_headroom);
			memcpy(skb_put(skb, beacon->head_len), beacon->head,
			       beacon->head_len);
2326

2327 2328 2329 2330 2331 2332 2333 2334
			/*
			 * 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
2335
				ieee80211_beacon_add_tim(ap, skb, beacon);
2336 2337 2338 2339
			} else {
				unsigned long flags;

				spin_lock_irqsave(&local->sta_lock, flags);
R
Rami Rosen 已提交
2340
				ieee80211_beacon_add_tim(ap, skb, beacon);
2341 2342
				spin_unlock_irqrestore(&local->sta_lock, flags);
			}
2343

2344 2345 2346 2347 2348
			if (tim_offset)
				*tim_offset = beacon->head_len;
			if (tim_length)
				*tim_length = skb->len - beacon->head_len;

J
Johannes Berg 已提交
2349 2350 2351
			if (beacon->tail)
				memcpy(skb_put(skb, beacon->tail_len),
				       beacon->tail, beacon->tail_len);
2352 2353
		} else
			goto out;
2354
	} else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
2355
		struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
2356
		struct ieee80211_hdr *hdr;
2357
		struct sk_buff *presp = rcu_dereference(ifibss->presp);
2358

2359
		if (!presp)
2360 2361
			goto out;

2362
		skb = skb_copy(presp, GFP_ATOMIC);
2363 2364 2365 2366
		if (!skb)
			goto out;

		hdr = (struct ieee80211_hdr *) skb->data;
2367 2368
		hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
						 IEEE80211_STYPE_BEACON);
J
Johannes Berg 已提交
2369
	} else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2370 2371
		struct ieee80211_mgmt *mgmt;
		u8 *pos;
2372 2373
		int hdr_len = offsetof(struct ieee80211_mgmt, u.beacon) +
			      sizeof(mgmt->u.beacon);
2374

2375 2376 2377 2378 2379
#ifdef CONFIG_MAC80211_MESH
		if (!sdata->u.mesh.mesh_id_len)
			goto out;
#endif

2380 2381 2382 2383 2384 2385
		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) +
2386 2387
				    2 + sizeof(struct ieee80211_ht_cap) +
				    2 + sizeof(struct ieee80211_ht_info) +
2388 2389 2390
				    2 + sdata->u.mesh.mesh_id_len +
				    2 + sizeof(struct ieee80211_meshconf_ie) +
				    sdata->u.mesh.ie_len);
J
Johannes Berg 已提交
2391 2392 2393 2394
		if (!skb)
			goto out;

		skb_reserve(skb, local->hw.extra_tx_headroom);
2395 2396
		mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len);
		memset(mgmt, 0, hdr_len);
2397 2398
		mgmt->frame_control =
		    cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_BEACON);
J
Johannes Berg 已提交
2399
		memset(mgmt->da, 0xff, ETH_ALEN);
2400 2401
		memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
		memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
J
Johannes Berg 已提交
2402
		mgmt->u.beacon.beacon_int =
2403
			cpu_to_le16(sdata->vif.bss_conf.beacon_int);
2404 2405
		mgmt->u.beacon.capab_info |= cpu_to_le16(
			sdata->u.mesh.security ? WLAN_CAPABILITY_PRIVACY : 0);
J
Johannes Berg 已提交
2406 2407 2408 2409 2410

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

2411
		if (ieee80211_add_srates_ie(&sdata->vif, skb) ||
2412
		    mesh_add_ds_params_ie(skb, sdata) ||
2413
		    ieee80211_add_ext_srates_ie(&sdata->vif, skb) ||
2414
		    mesh_add_rsn_ie(skb, sdata) ||
2415 2416
		    mesh_add_ht_cap_ie(skb, sdata) ||
		    mesh_add_ht_info_ie(skb, sdata) ||
2417 2418 2419 2420 2421 2422
		    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;
		}
2423 2424
	} else {
		WARN_ON(1);
2425
		goto out;
2426 2427
	}

2428 2429
	info = IEEE80211_SKB_CB(skb);

J
Johannes Berg 已提交
2430
	info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
2431
	info->flags |= IEEE80211_TX_CTL_NO_ACK;
2432
	info->band = band;
2433 2434 2435 2436 2437 2438 2439

	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;
2440 2441 2442 2443 2444
	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;
2445
	txrc.bss = true;
2446
	rate_control_get_rate(sdata, NULL, &txrc);
2447 2448

	info->control.vif = vif;
2449

2450 2451 2452
	info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT |
			IEEE80211_TX_CTL_ASSIGN_SEQ |
			IEEE80211_TX_CTL_FIRST_FRAGMENT;
2453
 out:
2454
	rcu_read_unlock();
2455 2456
	return skb;
}
2457
EXPORT_SYMBOL(ieee80211_beacon_get_tim);
2458

2459 2460 2461 2462 2463 2464 2465 2466 2467 2468 2469 2470 2471 2472 2473 2474 2475 2476 2477 2478 2479 2480 2481 2482 2483 2484 2485 2486 2487 2488 2489
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);

2490 2491 2492 2493 2494 2495 2496 2497 2498 2499 2500 2501 2502 2503 2504 2505 2506
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));
2507
	if (!skb)
2508
		return NULL;
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 2537 2538 2539 2540 2541 2542 2543 2544
	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));
2545
	if (!skb)
2546
		return NULL;
2547

2548 2549 2550 2551 2552 2553 2554 2555 2556 2557 2558 2559 2560 2561 2562 2563
	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);

2564 2565 2566 2567 2568 2569 2570 2571 2572 2573 2574 2575 2576 2577 2578 2579 2580 2581
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);
2582
	if (!skb)
2583 2584 2585 2586 2587 2588 2589 2590 2591 2592 2593 2594 2595 2596 2597 2598 2599 2600 2601 2602 2603 2604 2605 2606 2607 2608 2609 2610
		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);

2611
void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
2612
		       const void *frame, size_t frame_len,
2613
		       const struct ieee80211_tx_info *frame_txctl,
2614 2615 2616 2617
		       struct ieee80211_rts *rts)
{
	const struct ieee80211_hdr *hdr = frame;

2618 2619
	rts->frame_control =
	    cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
2620 2621
	rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
					       frame_txctl);
2622 2623 2624 2625 2626
	memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
	memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
}
EXPORT_SYMBOL(ieee80211_rts_get);

2627
void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
2628
			     const void *frame, size_t frame_len,
2629
			     const struct ieee80211_tx_info *frame_txctl,
2630 2631 2632 2633
			     struct ieee80211_cts *cts)
{
	const struct ieee80211_hdr *hdr = frame;

2634 2635
	cts->frame_control =
	    cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
2636 2637
	cts->duration = ieee80211_ctstoself_duration(hw, vif,
						     frame_len, frame_txctl);
2638 2639 2640 2641 2642
	memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
}
EXPORT_SYMBOL(ieee80211_ctstoself_get);

struct sk_buff *
2643
ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
2644
			  struct ieee80211_vif *vif)
2645 2646
{
	struct ieee80211_local *local = hw_to_local(hw);
2647
	struct sk_buff *skb = NULL;
2648
	struct ieee80211_tx_data tx;
2649 2650
	struct ieee80211_sub_if_data *sdata;
	struct ieee80211_if_ap *bss = NULL;
2651
	struct beacon_data *beacon;
2652
	struct ieee80211_tx_info *info;
2653

2654
	sdata = vif_to_sdata(vif);
2655
	bss = &sdata->u.ap;
2656 2657 2658 2659

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

2660
	if (sdata->vif.type != NL80211_IFTYPE_AP || !beacon || !beacon->head)
2661
		goto out;
2662

2663
	if (bss->dtim_count != 0 || !bss->dtim_bc_mc)
2664
		goto out; /* send buffered bc/mc only after DTIM beacon */
2665

2666 2667 2668
	while (1) {
		skb = skb_dequeue(&bss->ps_bc_buf);
		if (!skb)
2669
			goto out;
2670 2671 2672 2673 2674 2675 2676 2677 2678 2679 2680 2681
		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
2682
		if (!ieee80211_tx_prepare(sdata, &tx, skb))
2683 2684 2685
			break;
		dev_kfree_skb_any(skb);
	}
2686 2687 2688

	info = IEEE80211_SKB_CB(skb);

2689 2690
	tx.flags |= IEEE80211_TX_PS_BUFFERED;
	tx.channel = local->hw.conf.channel;
2691
	info->band = tx.channel->band;
2692

2693
	if (invoke_tx_handlers(&tx))
2694
		skb = NULL;
2695
 out:
2696
	rcu_read_unlock();
2697 2698 2699 2700

	return skb;
}
EXPORT_SYMBOL(ieee80211_get_buffered_bc);
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2702
void ieee80211_tx_skb(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
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2703 2704 2705 2706 2707
{
	skb_set_mac_header(skb, 0);
	skb_set_network_header(skb, 0);
	skb_set_transport_header(skb, 0);

2708 2709 2710
	/* Send all internal mgmt frames on VO. Accordingly set TID to 7. */
	skb_set_queue_mapping(skb, IEEE80211_AC_VO);
	skb->priority = 7;
2711

2712 2713 2714 2715 2716 2717
	/*
	 * 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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2718
	ieee80211_xmit(sdata, skb);
2719
	local_bh_enable();
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2720
}