tx.c 75.0 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.
	 *
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	 * Note: ifmgd->uapsd_queues access is racy here. If the value is
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	 * changed via debugfs, user needs to reassociate manually to have
	 * everything in sync.
	 */
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	if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) &&
	    (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) &&
	    skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO)
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		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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		}
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	} else if (unlikely(tx->sdata->vif.type == NL80211_IFTYPE_AP &&
			    ieee80211_is_data(hdr->frame_control) &&
			    !atomic_read(&tx->sdata->u.ap.num_sta_authorized))) {
		/*
		 * No associated STAs - no need to send multicast
		 * frames.
		 */
		return TX_DROP;
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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))
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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_NO_PS_BUFFER))) {
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		int ac = skb_get_queue_mapping(tx->skb);

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		/* only deauth, disassoc and action are bufferable MMPDUs */
		if (ieee80211_is_mgmt(hdr->frame_control) &&
		    !ieee80211_is_deauth(hdr->frame_control) &&
		    !ieee80211_is_disassoc(hdr->frame_control) &&
		    !ieee80211_is_action(hdr->frame_control)) {
			info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER;
			return TX_CONTINUE;
		}

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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) &&
553 554
		 (key = rcu_dereference(tx->sdata->default_mgmt_key)))
		tx->key = key;
555 556 557 558 559
	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)))
560
		tx->key = key;
561
	else if (tx->sdata->drop_unencrypted &&
562
		 (tx->skb->protocol != tx->sdata->control_port_protocol) &&
563 564 565
		 !(info->flags & IEEE80211_TX_CTL_INJECTED) &&
		 (!ieee80211_is_robust_mgmt_frame(hdr) ||
		  (ieee80211_is_action(hdr->frame_control) &&
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566
		   tx->sta && test_sta_flag(tx->sta, WLAN_STA_MFP)))) {
567
		I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted);
568
		return TX_DROP;
569
	} else
570 571 572
		tx->key = NULL;

	if (tx->key) {
573 574
		bool skip_hw = false;

575
		tx->key->tx_rx_count++;
576
		/* TODO: add threshold stuff again */
577

578 579 580 581
		switch (tx->key->conf.cipher) {
		case WLAN_CIPHER_SUITE_WEP40:
		case WLAN_CIPHER_SUITE_WEP104:
		case WLAN_CIPHER_SUITE_TKIP:
582
			if (!ieee80211_is_data_present(hdr->frame_control))
583 584
				tx->key = NULL;
			break;
585
		case WLAN_CIPHER_SUITE_CCMP:
586 587 588 589
			if (!ieee80211_is_data_present(hdr->frame_control) &&
			    !ieee80211_use_mfp(hdr->frame_control, tx->sta,
					       tx->skb))
				tx->key = NULL;
590 591 592 593
			else
				skip_hw = (tx->key->conf.flags &
					   IEEE80211_KEY_FLAG_SW_MGMT) &&
					ieee80211_is_mgmt(hdr->frame_control);
594
			break;
595
		case WLAN_CIPHER_SUITE_AES_CMAC:
596 597 598
			if (!ieee80211_is_mgmt(hdr->frame_control))
				tx->key = NULL;
			break;
599
		}
600

601 602 603
		if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED))
			return TX_DROP;

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604
		if (!skip_hw && tx->key &&
J
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605
		    tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
606
			info->control.hw_key = &tx->key->conf;
607 608
	}

609
	return TX_CONTINUE;
610 611
}

612
static ieee80211_tx_result debug_noinline
613
ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
614
{
615
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
616 617 618
	struct ieee80211_hdr *hdr = (void *)tx->skb->data;
	struct ieee80211_supported_band *sband;
	struct ieee80211_rate *rate;
S
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619 620
	int i;
	u32 len;
621 622
	bool inval = false, rts = false, short_preamble = false;
	struct ieee80211_tx_rate_control txrc;
J
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623
	bool assoc = false;
624

625
	memset(&txrc, 0, sizeof(txrc));
626

627
	sband = tx->local->hw.wiphy->bands[tx->channel->band];
628

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

	/* set up the tx rate control struct we give the RC algo */
J
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633
	txrc.hw = &tx->local->hw;
634 635 636 637
	txrc.sband = sband;
	txrc.bss_conf = &tx->sdata->vif.bss_conf;
	txrc.skb = tx->skb;
	txrc.reported_rate.idx = -1;
638 639 640 641 642
	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;
643 644 645
	memcpy(txrc.rate_idx_mcs_mask,
	       tx->sdata->rc_rateidx_mcs_mask[tx->channel->band],
	       sizeof(txrc.rate_idx_mcs_mask));
646
	txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
647
		    tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT ||
648
		    tx->sdata->vif.type == NL80211_IFTYPE_ADHOC);
649 650

	/* set up RTS protection if desired */
651
	if (len > tx->local->hw.wiphy->rts_threshold) {
652
		txrc.rts = rts = true;
653 654
	}

655 656 657 658 659 660 661 662
	/*
	 * 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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663
	     (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE))))
664
		txrc.short_preamble = short_preamble = true;
665

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666 667
	if (tx->sta)
		assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
668 669 670 671 672

	/*
	 * Lets not bother rate control if we're associated and cannot
	 * talk to the sta. This should not happen.
	 */
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673
	if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc &&
674 675 676 677
		 !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",
678
		 tx->sdata->name, hdr->addr1,
679 680
		 tx->channel->band ? 5 : 2))
		return TX_DROP;
681

682 683 684 685
	/*
	 * If we're associated with the sta at this point we know we can at
	 * least send the frame at the lowest bit rate.
	 */
686 687 688 689 690
	rate_control_get_rate(tx->sdata, tx->sta, &txrc);

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

691
	if (txrc.reported_rate.idx < 0) {
692
		txrc.reported_rate = info->control.rates[0];
693 694 695
		if (tx->sta && ieee80211_is_data(hdr->frame_control))
			tx->sta->last_tx_rate = txrc.reported_rate;
	} else if (tx->sta)
696
		tx->sta->last_tx_rate = txrc.reported_rate;
697

698 699
	if (unlikely(!info->control.rates[0].count))
		info->control.rates[0].count = 1;
700

701 702 703 704
	if (WARN_ON_ONCE((info->control.rates[0].count > 1) &&
			 (info->flags & IEEE80211_TX_CTL_NO_ACK)))
		info->control.rates[0].count = 1;

705 706 707 708 709
	if (is_multicast_ether_addr(hdr->addr1)) {
		/*
		 * XXX: verify the rate is in the basic rateset
		 */
		return TX_CONTINUE;
710 711
	}

712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736
	/*
	 * 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;
737 738
	}

739 740 741 742 743 744 745 746 747 748 749 750 751 752
	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;
		}
753

754 755 756 757 758 759 760 761
		/*
		 * 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;
		}
762

763 764 765 766
		/* set up RTS protection if desired */
		if (rts)
			info->control.rates[i].flags |=
				IEEE80211_TX_RC_USE_RTS_CTS;
767

768
		/* RC is busted */
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Sujith 已提交
769 770
		if (WARN_ON_ONCE(info->control.rates[i].idx >=
				 sband->n_bitrates)) {
771 772
			info->control.rates[i].idx = -1;
			continue;
773
		}
774

775 776 777 778 779 780 781 782 783 784 785 786 787
		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;
788 789
	}

790 791 792
	return TX_CONTINUE;
}

793 794 795 796 797 798 799 800 801
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;

802 803 804 805 806
	/*
	 * 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.
	 */
807
	if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR))
808 809
		return TX_CONTINUE;

810 811 812 813 814 815
	if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
		return TX_CONTINUE;

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

816 817 818
	if (ieee80211_is_qos_nullfunc(hdr->frame_control))
		return TX_CONTINUE;

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819 820 821 822 823
	/*
	 * Anything but QoS data that has a sequence number field
	 * (is long enough) gets a sequence number from the global
	 * counter.
	 */
824
	if (!ieee80211_is_data_qos(hdr->frame_control)) {
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825
		/* driver should assign sequence number */
826
		info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
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827 828 829
		/* 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;
830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854
		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;
}

855
static int ieee80211_fragment(struct ieee80211_tx_data *tx,
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856 857 858
			      struct sk_buff *skb, int hdrlen,
			      int frag_threshold)
{
859
	struct ieee80211_local *local = tx->local;
860
	struct ieee80211_tx_info *info;
861
	struct sk_buff *tmp;
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862 863 864 865 866 867 868
	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;

869 870
	/* first fragment was already added to queue by caller */

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871 872 873 874 875 876 877 878 879 880 881 882
	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;
883 884 885

		__skb_queue_tail(&tx->skbs, tmp);

J
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886 887 888 889
		skb_reserve(tmp, local->tx_headroom +
				 IEEE80211_ENCRYPT_HEADROOM);
		/* copy control information */
		memcpy(tmp->cb, skb->cb, sizeof(tmp->cb));
890 891 892 893 894 895 896 897

		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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898 899 900 901 902 903 904 905 906 907 908
		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;
	}

909
	/* adjust first fragment's length */
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910 911 912 913
	skb->len = hdrlen + per_fragm;
	return 0;
}

914
static ieee80211_tx_result debug_noinline
915 916
ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
{
J
Johannes Berg 已提交
917 918 919
	struct sk_buff *skb = tx->skb;
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
	struct ieee80211_hdr *hdr = (void *)skb->data;
920
	int frag_threshold = tx->local->hw.wiphy->frag_threshold;
J
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921 922
	int hdrlen;
	int fragnum;
923

924 925 926 927
	/* no matter what happens, tx->skb moves to tx->skbs */
	__skb_queue_tail(&tx->skbs, skb);
	tx->skb = NULL;

928 929 930 931
	if (info->flags & IEEE80211_TX_CTL_DONTFRAG)
		return TX_CONTINUE;

	if (tx->local->ops->set_frag_threshold)
932 933
		return TX_CONTINUE;

934 935
	/*
	 * Warn when submitting a fragmented A-MPDU frame and drop it.
J
Johannes Berg 已提交
936
	 * This scenario is handled in ieee80211_tx_prepare but extra
937
	 * caution taken here as fragmented ampdu may cause Tx stop.
938
	 */
S
Sujith 已提交
939
	if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
940 941
		return TX_DROP;

942
	hdrlen = ieee80211_hdrlen(hdr->frame_control);
943

944
	/* internal error, why isn't DONTFRAG set? */
945
	if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))
J
Johannes Berg 已提交
946
		return TX_DROP;
947

J
Johannes Berg 已提交
948 949 950 951 952 953 954 955
	/*
	 * 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.
	 */
956
	if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold))
J
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957
		return TX_DROP;
958

J
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959 960
	/* update duration/seq/flags of fragments */
	fragnum = 0;
961 962

	skb_queue_walk(&tx->skbs, skb) {
J
Johannes Berg 已提交
963 964
		int next_len;
		const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
965

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966 967
		hdr = (void *)skb->data;
		info = IEEE80211_SKB_CB(skb);
968

969
		if (!skb_queue_is_last(&tx->skbs, skb)) {
J
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970
			hdr->frame_control |= morefrags;
971 972 973 974 975 976 977 978 979 980
			/*
			 * 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
Johannes Berg 已提交
981 982 983
		} else {
			hdr->frame_control &= ~morefrags;
			next_len = 0;
984
		}
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985 986
		hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG);
		fragnum++;
987
	}
988

989
	return TX_CONTINUE;
990 991
}

992 993 994
static ieee80211_tx_result debug_noinline
ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
{
995
	struct sk_buff *skb;
996 997 998 999 1000

	if (!tx->sta)
		return TX_CONTINUE;

	tx->sta->tx_packets++;
1001
	skb_queue_walk(&tx->skbs, skb) {
1002 1003
		tx->sta->tx_fragments++;
		tx->sta->tx_bytes += skb->len;
1004
	}
1005 1006 1007 1008

	return TX_CONTINUE;
}

1009
static ieee80211_tx_result debug_noinline
1010 1011 1012 1013 1014
ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
{
	if (!tx->key)
		return TX_CONTINUE;

1015 1016 1017
	switch (tx->key->conf.cipher) {
	case WLAN_CIPHER_SUITE_WEP40:
	case WLAN_CIPHER_SUITE_WEP104:
1018
		return ieee80211_crypto_wep_encrypt(tx);
1019
	case WLAN_CIPHER_SUITE_TKIP:
1020
		return ieee80211_crypto_tkip_encrypt(tx);
1021
	case WLAN_CIPHER_SUITE_CCMP:
1022
		return ieee80211_crypto_ccmp_encrypt(tx);
1023
	case WLAN_CIPHER_SUITE_AES_CMAC:
1024
		return ieee80211_crypto_aes_cmac_encrypt(tx);
1025
	default:
1026
		return ieee80211_crypto_hw_encrypt(tx);
1027 1028 1029 1030 1031
	}

	return TX_DROP;
}

1032
static ieee80211_tx_result debug_noinline
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1033 1034
ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
{
1035
	struct sk_buff *skb;
J
Johannes Berg 已提交
1036 1037 1038
	struct ieee80211_hdr *hdr;
	int next_len;
	bool group_addr;
J
Johannes Berg 已提交
1039

1040
	skb_queue_walk(&tx->skbs, skb) {
J
Johannes Berg 已提交
1041
		hdr = (void *) skb->data;
1042 1043
		if (unlikely(ieee80211_is_pspoll(hdr->frame_control)))
			break; /* must not overwrite AID */
1044 1045 1046 1047 1048
		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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1049
		group_addr = is_multicast_ether_addr(hdr->addr1);
J
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1050

J
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1051
		hdr->duration_id =
1052 1053
			ieee80211_duration(tx, skb, group_addr, next_len);
	}
J
Johannes Berg 已提交
1054 1055 1056 1057

	return TX_CONTINUE;
}

1058 1059
/* actual transmit path */

1060 1061 1062 1063 1064 1065 1066
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;
1067
	bool reset_agg_timer = false;
1068
	struct sk_buff *purge_skb = NULL;
1069 1070 1071

	if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
		info->flags |= IEEE80211_TX_CTL_AMPDU;
1072
		reset_agg_timer = true;
1073 1074 1075 1076 1077
	} 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
		 */
1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097
	} 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
1098
		tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid);
1099 1100 1101 1102 1103

		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;
1104
			reset_agg_timer = true;
1105 1106 1107 1108 1109
		} else {
			queued = true;
			info->control.vif = &tx->sdata->vif;
			info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
			__skb_queue_tail(&tid_tx->pending, skb);
1110 1111
			if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER)
				purge_skb = __skb_dequeue(&tid_tx->pending);
1112 1113
		}
		spin_unlock(&tx->sta->lock);
1114 1115 1116

		if (purge_skb)
			dev_kfree_skb(purge_skb);
1117 1118
	}

1119 1120
	/* reset session timer */
	if (reset_agg_timer && tid_tx->timeout)
1121
		tid_tx->last_tx = jiffies;
1122

1123 1124 1125
	return queued;
}

1126 1127 1128
/*
 * initialises @tx
 */
1129
static ieee80211_tx_result
J
Johannes Berg 已提交
1130 1131 1132
ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
		     struct ieee80211_tx_data *tx,
		     struct sk_buff *skb)
1133
{
J
Johannes Berg 已提交
1134
	struct ieee80211_local *local = sdata->local;
1135
	struct ieee80211_hdr *hdr;
1136
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
J
Johannes Berg 已提交
1137
	int tid;
1138
	u8 *qc;
1139 1140 1141 1142

	memset(tx, 0, sizeof(*tx));
	tx->skb = skb;
	tx->local = local;
J
Johannes Berg 已提交
1143
	tx->sdata = sdata;
1144
	tx->channel = local->hw.conf.channel;
1145
	__skb_queue_head_init(&tx->skbs);
1146

1147 1148 1149 1150 1151 1152 1153
	/*
	 * 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;

1154 1155
	hdr = (struct ieee80211_hdr *) skb->data;

1156
	if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1157
		tx->sta = rcu_dereference(sdata->u.vlan.sta);
1158 1159
		if (!tx->sta && sdata->dev->ieee80211_ptr->use_4addr)
			return TX_DROP;
1160 1161
	} else if (info->flags & IEEE80211_TX_CTL_INJECTED) {
		tx->sta = sta_info_get_bss(sdata, hdr->addr1);
1162
	}
1163
	if (!tx->sta)
1164
		tx->sta = sta_info_get(sdata, hdr->addr1);
1165

1166
	if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) &&
1167
	    !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
1168 1169
	    (local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION) &&
	    !(local->hw.flags & IEEE80211_HW_TX_AMPDU_SETUP_IN_HW)) {
1170 1171
		struct tid_ampdu_tx *tid_tx;

S
Sujith 已提交
1172 1173 1174
		qc = ieee80211_get_qos_ctl(hdr);
		tid = *qc & IEEE80211_QOS_CTL_TID_MASK;

1175 1176 1177
		tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
		if (tid_tx) {
			bool queued;
1178

1179 1180 1181 1182 1183 1184
			queued = ieee80211_tx_prep_agg(tx, skb, info,
						       tid_tx, tid);

			if (unlikely(queued))
				return TX_QUEUED;
		}
S
Sujith 已提交
1185 1186
	}

1187
	if (is_multicast_ether_addr(hdr->addr1)) {
1188
		tx->flags &= ~IEEE80211_TX_UNICAST;
1189
		info->flags |= IEEE80211_TX_CTL_NO_ACK;
1190
	} else
1191
		tx->flags |= IEEE80211_TX_UNICAST;
1192

1193 1194 1195 1196 1197
	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;
1198 1199
	}

1200
	if (!tx->sta)
1201
		info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
J
Johannes Berg 已提交
1202
	else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT))
1203
		info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1204

1205
	info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
1206

1207
	return TX_CONTINUE;
1208 1209
}

1210 1211 1212 1213 1214
static bool ieee80211_tx_frags(struct ieee80211_local *local,
			       struct ieee80211_vif *vif,
			       struct ieee80211_sta *sta,
			       struct sk_buff_head *skbs,
			       bool txpending)
1215
{
1216
	struct sk_buff *skb, *tmp;
1217
	struct ieee80211_tx_info *info;
J
Johannes Berg 已提交
1218
	unsigned long flags;
1219

1220
	skb_queue_walk_safe(skbs, skb, tmp) {
J
Johannes Berg 已提交
1221 1222 1223 1224
		int q = skb_get_queue_mapping(skb);

		spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
		if (local->queue_stop_reasons[q] ||
1225 1226 1227 1228 1229 1230
		    (!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.
			 */
1231
			if (txpending)
J
Johannes Berg 已提交
1232
				skb_queue_splice_init(skbs, &local->pending[q]);
1233
			else
J
Johannes Berg 已提交
1234 1235
				skb_queue_splice_tail_init(skbs,
							   &local->pending[q]);
1236 1237 1238 1239 1240

			spin_unlock_irqrestore(&local->queue_stop_reason_lock,
					       flags);
			return false;
		}
J
Johannes Berg 已提交
1241
		spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1242

1243
		info = IEEE80211_SKB_CB(skb);
1244 1245
		info->control.vif = vif;
		info->control.sta = sta;
1246

1247 1248 1249
		__skb_unlink(skb, skbs);
		drv_tx(local, skb);
	}
1250

1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267
	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;
1268

1269 1270
	if (WARN_ON(skb_queue_empty(skbs)))
		return true;
J
Johannes Berg 已提交
1271

1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295
	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;
1296
	}
J
Johannes Berg 已提交
1297

1298 1299 1300 1301 1302 1303
	if (local->ops->tx_frags)
		drv_tx_frags(local, vif, pubsta, skbs);
	else
		result = ieee80211_tx_frags(local, vif, pubsta, skbs,
					    txpending);

1304 1305 1306
	ieee80211_tpt_led_trig_tx(local, fc, led_len);
	ieee80211_led_tx(local, 1);

J
Johannes Berg 已提交
1307
	WARN_ON_ONCE(!skb_queue_empty(skbs));
1308

1309
	return result;
1310 1311
}

1312 1313 1314 1315 1316 1317
/*
 * 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)
{
1318
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
1319 1320
	ieee80211_tx_result res = TX_DROP;

1321 1322 1323 1324 1325 1326 1327
#define CALL_TXH(txh) \
	do {				\
		res = txh(tx);		\
		if (res != TX_CONTINUE)	\
			goto txh_done;	\
	} while (0)

1328
	CALL_TXH(ieee80211_tx_h_dynamic_ps);
1329 1330
	CALL_TXH(ieee80211_tx_h_check_assoc);
	CALL_TXH(ieee80211_tx_h_ps_buf);
1331
	CALL_TXH(ieee80211_tx_h_check_control_port_protocol);
1332
	CALL_TXH(ieee80211_tx_h_select_key);
1333 1334
	if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
		CALL_TXH(ieee80211_tx_h_rate_ctrl);
1335

J
Johannes Berg 已提交
1336 1337 1338
	if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) {
		__skb_queue_tail(&tx->skbs, tx->skb);
		tx->skb = NULL;
1339
		goto txh_done;
J
Johannes Berg 已提交
1340
	}
1341 1342

	CALL_TXH(ieee80211_tx_h_michael_mic_add);
1343 1344
	CALL_TXH(ieee80211_tx_h_sequence);
	CALL_TXH(ieee80211_tx_h_fragment);
1345
	/* handlers after fragment must be aware of tx info fragmentation! */
1346 1347
	CALL_TXH(ieee80211_tx_h_stats);
	CALL_TXH(ieee80211_tx_h_encrypt);
1348 1349
	if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
		CALL_TXH(ieee80211_tx_h_calculate_duration);
1350
#undef CALL_TXH
1351

1352
 txh_done:
1353
	if (unlikely(res == TX_DROP)) {
1354
		I802_DEBUG_INC(tx->local->tx_handlers_drop);
1355 1356 1357 1358
		if (tx->skb)
			dev_kfree_skb(tx->skb);
		else
			__skb_queue_purge(&tx->skbs);
1359 1360
		return -1;
	} else if (unlikely(res == TX_QUEUED)) {
1361
		I802_DEBUG_INC(tx->local->tx_handlers_queued);
1362 1363 1364 1365 1366 1367
		return -1;
	}

	return 0;
}

1368 1369 1370 1371
/*
 * 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
1372
			 struct sk_buff *skb, bool txpending)
1373
{
J
Johannes Berg 已提交
1374
	struct ieee80211_local *local = sdata->local;
1375
	struct ieee80211_tx_data tx;
1376
	ieee80211_tx_result res_prepare;
1377
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1378
	bool result = true;
1379
	int led_len;
1380 1381 1382

	if (unlikely(skb->len < 10)) {
		dev_kfree_skb(skb);
1383
		return true;
1384 1385
	}

1386 1387
	rcu_read_lock();

1388
	/* initialises tx */
1389
	led_len = skb->len;
J
Johannes Berg 已提交
1390
	res_prepare = ieee80211_tx_prepare(sdata, &tx, skb);
1391

1392
	if (unlikely(res_prepare == TX_DROP)) {
1393
		dev_kfree_skb(skb);
1394
		goto out;
1395
	} else if (unlikely(res_prepare == TX_QUEUED)) {
1396
		goto out;
1397 1398
	}

1399
	tx.channel = local->hw.conf.channel;
1400
	info->band = tx.channel->band;
1401

1402
	if (!invoke_tx_handlers(&tx))
1403 1404
		result = __ieee80211_tx(local, &tx.skbs, led_len,
					tx.sta, txpending);
1405
 out:
1406
	rcu_read_unlock();
1407
	return result;
1408 1409 1410 1411
}

/* device xmit handlers */

1412
static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata,
1413 1414 1415
				struct sk_buff *skb,
				int head_need, bool may_encrypt)
{
1416
	struct ieee80211_local *local = sdata->local;
1417 1418
	int tail_need = 0;

1419
	if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) {
1420 1421 1422 1423 1424
		tail_need = IEEE80211_ENCRYPT_TAILROOM;
		tail_need -= skb_tailroom(skb);
		tail_need = max_t(int, tail_need, 0);
	}

1425
	if (skb_cloned(skb))
1426
		I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1427
	else if (head_need || tail_need)
1428
		I802_DEBUG_INC(local->tx_expand_skb_head);
1429 1430
	else
		return 0;
1431 1432

	if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
J
Joe Perches 已提交
1433 1434
		wiphy_debug(local->hw.wiphy,
			    "failed to reallocate TX buffer\n");
1435 1436 1437 1438 1439 1440
		return -ENOMEM;
	}

	return 0;
}

1441
void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
1442
{
J
Johannes Berg 已提交
1443
	struct ieee80211_local *local = sdata->local;
1444
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1445
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1446
	int headroom;
1447
	bool may_encrypt;
1448

1449 1450
	rcu_read_lock();

J
Johannes Berg 已提交
1451
	may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT);
1452

J
Johannes Berg 已提交
1453
	headroom = local->tx_headroom;
1454 1455 1456 1457 1458
	if (may_encrypt)
		headroom += IEEE80211_ENCRYPT_HEADROOM;
	headroom -= skb_headroom(skb);
	headroom = max_t(int, 0, headroom);

1459
	if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) {
1460
		dev_kfree_skb(skb);
1461
		rcu_read_unlock();
J
Johannes Berg 已提交
1462
		return;
1463 1464
	}

1465
	hdr = (struct ieee80211_hdr *) skb->data;
1466
	info->control.vif = &sdata->vif;
1467

1468 1469
	if (ieee80211_vif_is_mesh(&sdata->vif) &&
	    ieee80211_is_data(hdr->frame_control) &&
1470 1471 1472 1473 1474 1475
	    !is_multicast_ether_addr(hdr->addr1) &&
	    mesh_nexthop_resolve(skb, sdata)) {
		/* skb queued: don't free */
		rcu_read_unlock();
		return;
	}
1476

1477
	ieee80211_set_qos_hdr(sdata, skb);
J
Johannes Berg 已提交
1478
	ieee80211_tx(sdata, skb, false);
1479
	rcu_read_unlock();
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 1563 1564
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;
}

1565 1566
netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
					 struct net_device *dev)
1567 1568
{
	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1569
	struct ieee80211_channel *chan = local->hw.conf.channel;
1570 1571
	struct ieee80211_radiotap_header *prthdr =
		(struct ieee80211_radiotap_header *)skb->data;
J
Johannes Berg 已提交
1572
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1573
	struct ieee80211_hdr *hdr;
J
Johannes Berg 已提交
1574
	struct ieee80211_sub_if_data *tmp_sdata, *sdata;
1575
	u16 len_rthdr;
J
Johannes Berg 已提交
1576
	int hdrlen;
1577

1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597
	/*
	 * 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;

1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611
	/* 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 */
1612 1613 1614 1615 1616 1617 1618

	/*
	 * 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
	 */
1619
	skb_set_mac_header(skb, len_rthdr);
1620
	/*
1621 1622
	 * 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
1623
	 */
1624 1625
	skb_set_network_header(skb, len_rthdr);
	skb_set_transport_header(skb, len_rthdr);
1626

J
Johannes Berg 已提交
1627 1628 1629 1630 1631 1632 1633 1634 1635
	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;

1636 1637 1638 1639
	/*
	 * Initialize skb->protocol if the injected frame is a data frame
	 * carrying a rfc1042 header
	 */
J
Johannes Berg 已提交
1640 1641 1642 1643 1644 1645 1646
	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]);
1647 1648
	}

J
Johannes Berg 已提交
1649 1650
	memset(info, 0, sizeof(*info));

J
Johannes Berg 已提交
1651
	info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
1652 1653 1654 1655 1656
		      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
1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681

	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;
		}
	}
1682

J
Johannes Berg 已提交
1683 1684 1685
	ieee80211_xmit(sdata, skb);
	rcu_read_unlock();

1686
	return NETDEV_TX_OK;
1687 1688 1689 1690

fail:
	dev_kfree_skb(skb);
	return NETDEV_TX_OK; /* meaning, we dealt with the skb */
1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707
}

/**
 * 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).
 */
1708 1709
netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
				    struct net_device *dev)
1710
{
1711 1712
	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
	struct ieee80211_local *local = sdata->local;
1713
	struct ieee80211_tx_info *info;
1714
	int ret = NETDEV_TX_BUSY, head_need;
1715 1716
	u16 ethertype, hdrlen,  meshhdrlen = 0;
	__le16 fc;
1717
	struct ieee80211_hdr hdr;
1718
	struct ieee80211s_hdr mesh_hdr __maybe_unused;
1719
	struct mesh_path __maybe_unused *mppath = NULL;
1720 1721
	const u8 *encaps_data;
	int encaps_len, skip_header_bytes;
1722
	int nh_pos, h_pos;
1723
	struct sta_info *sta = NULL;
J
Johannes Berg 已提交
1724
	bool wme_sta = false, authorized = false, tdls_auth = false;
1725
	bool tdls_direct = false;
J
Johannes Berg 已提交
1726 1727 1728
	bool multicast;
	u32 info_flags = 0;
	u16 info_id = 0;
1729 1730

	if (unlikely(skb->len < ETH_HLEN)) {
1731
		ret = NETDEV_TX_OK;
1732 1733 1734 1735 1736 1737
		goto fail;
	}

	/* convert Ethernet header to proper 802.11 header (based on
	 * operation mode) */
	ethertype = (skb->data[12] << 8) | skb->data[13];
1738
	fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
1739

1740
	switch (sdata->vif.type) {
1741
	case NL80211_IFTYPE_AP_VLAN:
1742
		rcu_read_lock();
1743
		sta = rcu_dereference(sdata->u.vlan.sta);
1744 1745 1746 1747
		if (sta) {
			fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
			/* RA TA DA SA */
			memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN);
1748
			memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1749 1750 1751
			memcpy(hdr.addr3, skb->data, ETH_ALEN);
			memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
			hdrlen = 30;
J
Johannes Berg 已提交
1752 1753
			authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
			wme_sta = test_sta_flag(sta, WLAN_STA_WME);
1754 1755 1756 1757 1758 1759
		}
		rcu_read_unlock();
		if (sta)
			break;
		/* fall through */
	case NL80211_IFTYPE_AP:
1760
		fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
1761 1762
		/* DA BSSID SA */
		memcpy(hdr.addr1, skb->data, ETH_ALEN);
1763
		memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1764 1765
		memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
		hdrlen = 24;
1766
		break;
1767
	case NL80211_IFTYPE_WDS:
1768
		fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1769 1770
		/* RA TA DA SA */
		memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
1771
		memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1772 1773 1774
		memcpy(hdr.addr3, skb->data, ETH_ALEN);
		memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
		hdrlen = 30;
1775
		break;
1776
#ifdef CONFIG_MAC80211_MESH
1777
	case NL80211_IFTYPE_MESH_POINT:
1778
		if (!sdata->u.mesh.mshcfg.dot11MeshTTL) {
1779
			/* Do not send frames with mesh_ttl == 0 */
1780
			sdata->u.mesh.mshstats.dropped_frames_ttl++;
1781
			ret = NETDEV_TX_OK;
1782
			goto fail;
1783
		}
1784
		rcu_read_lock();
1785 1786
		if (!is_multicast_ether_addr(skb->data))
			mppath = mpp_path_lookup(skb->data, sdata);
1787

1788
		/*
1789 1790 1791 1792
		 * 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)
1793
		 */
1794
		if (compare_ether_addr(sdata->vif.addr,
1795
				       skb->data + ETH_ALEN) == 0 &&
1796
		    !(mppath && compare_ether_addr(mppath->mpp, skb->data))) {
1797 1798
			hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
					skb->data, skb->data + ETH_ALEN);
1799
			rcu_read_unlock();
1800
			meshhdrlen = ieee80211_new_mesh_header(&mesh_hdr,
1801
					sdata, NULL, NULL);
1802
		} else {
1803
			int is_mesh_mcast = 1;
1804
			const u8 *mesh_da;
1805 1806

			if (is_multicast_ether_addr(skb->data))
1807 1808
				/* DA TA mSA AE:SA */
				mesh_da = skb->data;
1809
			else {
1810 1811
				static const u8 bcast[ETH_ALEN] =
					{ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
1812 1813 1814 1815
				if (mppath) {
					/* RA TA mDA mSA AE:DA SA */
					mesh_da = mppath->mpp;
					is_mesh_mcast = 0;
1816
				} else {
1817
					/* DA TA mSA AE:SA */
1818 1819
					mesh_da = bcast;
				}
1820
			}
1821
			hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
1822
					mesh_da, sdata->vif.addr);
1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835
			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);
1836 1837

		}
1838 1839
		break;
#endif
1840
	case NL80211_IFTYPE_STATION:
1841
		if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
J
Johannes Berg 已提交
1842 1843
			bool tdls_peer = false;

1844 1845
			rcu_read_lock();
			sta = sta_info_get(sdata, skb->data);
J
Johannes Berg 已提交
1846 1847 1848 1849 1850 1851 1852 1853 1854
			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);
			}
1855 1856 1857 1858 1859 1860 1861
			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
1862
			tdls_direct = tdls_peer && (tdls_auth ||
1863 1864 1865 1866 1867 1868
				 !(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
1869
			if (!tdls_auth) {
1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882
				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);
1883
			/* RA TA DA SA */
1884
			memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
1885
			memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1886 1887 1888 1889 1890 1891
			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 */
1892
			memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
1893 1894 1895 1896
			memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
			memcpy(hdr.addr3, skb->data, ETH_ALEN);
			hdrlen = 24;
		}
1897
		break;
1898
	case NL80211_IFTYPE_ADHOC:
1899 1900 1901
		/* DA SA BSSID */
		memcpy(hdr.addr1, skb->data, ETH_ALEN);
		memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1902
		memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN);
1903
		hdrlen = 24;
1904 1905
		break;
	default:
1906
		ret = NETDEV_TX_OK;
1907 1908 1909
		goto fail;
	}

1910 1911 1912 1913 1914
	/*
	 * 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
1915 1916
	multicast = is_multicast_ether_addr(hdr.addr1);
	if (!multicast) {
1917
		rcu_read_lock();
1918
		sta = sta_info_get(sdata, hdr.addr1);
J
Johannes Berg 已提交
1919 1920 1921 1922
		if (sta) {
			authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
			wme_sta = test_sta_flag(sta, WLAN_STA_WME);
		}
1923
		rcu_read_unlock();
1924 1925
	}

1926 1927
	/* For mesh, the use of the QoS header is mandatory */
	if (ieee80211_vif_is_mesh(&sdata->vif))
J
Johannes Berg 已提交
1928
		wme_sta = true;
1929

1930
	/* receiver and we are QoS enabled, use a QoS type frame */
J
Johannes Berg 已提交
1931
	if (wme_sta && local->hw.queues >= IEEE80211_NUM_ACS) {
1932
		fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
1933 1934 1935 1936
		hdrlen += 2;
	}

	/*
1937 1938
	 * Drop unicast frames to unauthorised stations unless they are
	 * EAPOL frames from the local station.
1939
	 */
1940 1941 1942 1943
	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)))) {
1944 1945
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
		if (net_ratelimit())
1946
			printk(KERN_DEBUG "%s: dropped frame to %pM"
1947
			       " (unauthorized port)\n", dev->name,
1948
			       hdr.addr1);
1949 1950 1951 1952
#endif

		I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);

1953
		ret = NETDEV_TX_OK;
1954 1955 1956
		goto fail;
	}

J
Johannes Berg 已提交
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 1994 1995
	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;
		}
	}

1996 1997 1998 1999
	/*
	 * If the skb is shared we need to obtain our own copy.
	 */
	if (skb_shared(skb)) {
J
Johannes Berg 已提交
2000 2001 2002 2003 2004
		struct sk_buff *tmp_skb = skb;

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

2005
		skb = skb_clone(skb, GFP_ATOMIC);
2006 2007 2008 2009 2010 2011 2012 2013
		kfree_skb(tmp_skb);

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

2014
	hdr.frame_control = fc;
2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031
	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;
	}

2032 2033 2034
	nh_pos = skb_network_header(skb) - skb->data;
	h_pos = skb_transport_header(skb) - skb->data;

2035 2036 2037 2038
	skb_pull(skb, skip_header_bytes);
	nh_pos -= skip_header_bytes;
	h_pos -= skip_header_bytes;

2039
	head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
2040

2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051
	/*
	 * 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.
	 */
2052

2053
	if (head_need > 0 || skb_cloned(skb)) {
2054 2055 2056
		head_need += IEEE80211_ENCRYPT_HEADROOM;
		head_need += local->tx_headroom;
		head_need = max_t(int, 0, head_need);
2057
		if (ieee80211_skb_resize(sdata, skb, head_need, true))
2058 2059 2060 2061 2062 2063 2064 2065
			goto fail;
	}

	if (encaps_data) {
		memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
		nh_pos += encaps_len;
		h_pos += encaps_len;
	}
2066

2067
#ifdef CONFIG_MAC80211_MESH
2068 2069 2070 2071 2072
	if (meshhdrlen > 0) {
		memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
		nh_pos += meshhdrlen;
		h_pos += meshhdrlen;
	}
2073
#endif
2074

2075
	if (ieee80211_is_data_qos(fc)) {
2076 2077 2078 2079 2080 2081 2082 2083 2084 2085 2086 2087
		__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);

2088 2089 2090
	nh_pos += hdrlen;
	h_pos += hdrlen;

2091 2092
	dev->stats.tx_packets++;
	dev->stats.tx_bytes += skb->len;
2093 2094 2095 2096 2097 2098 2099 2100

	/* 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);

2101
	info = IEEE80211_SKB_CB(skb);
J
Johannes Berg 已提交
2102 2103
	memset(info, 0, sizeof(*info));

2104
	dev->trans_start = jiffies;
J
Johannes Berg 已提交
2105 2106 2107 2108

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

J
Johannes Berg 已提交
2109
	ieee80211_xmit(sdata, skb);
2110

2111
	return NETDEV_TX_OK;
2112 2113

 fail:
2114
	if (ret == NETDEV_TX_OK)
2115 2116 2117 2118 2119 2120
		dev_kfree_skb(skb);

	return ret;
}


2121 2122 2123 2124
/*
 * ieee80211_clear_tx_pending may not be called in a context where
 * it is possible that it packets could come in again.
 */
2125 2126
void ieee80211_clear_tx_pending(struct ieee80211_local *local)
{
J
Johannes Berg 已提交
2127
	int i;
2128

2129 2130
	for (i = 0; i < local->hw.queues; i++)
		skb_queue_purge(&local->pending[i]);
2131 2132
}

2133 2134 2135 2136 2137
/*
 * 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.
 */
2138 2139 2140 2141 2142 2143 2144
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;
2145
	bool result;
2146

2147
	sdata = vif_to_sdata(info->control.vif);
2148 2149

	if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) {
2150
		result = ieee80211_tx(sdata, skb, true);
2151
	} else {
2152 2153 2154 2155 2156
		struct sk_buff_head skbs;

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

2157
		hdr = (struct ieee80211_hdr *)skb->data;
2158
		sta = sta_info_get(sdata, hdr->addr1);
2159

2160
		result = __ieee80211_tx(local, &skbs, skb->len, sta, true);
2161 2162 2163 2164 2165
	}

	return result;
}

2166
/*
J
Johannes Berg 已提交
2167
 * Transmit all pending packets. Called from tasklet.
2168
 */
2169 2170 2171
void ieee80211_tx_pending(unsigned long data)
{
	struct ieee80211_local *local = (struct ieee80211_local *)data;
2172
	struct ieee80211_sub_if_data *sdata;
2173
	unsigned long flags;
2174
	int i;
J
Johannes Berg 已提交
2175
	bool txok;
2176

2177
	rcu_read_lock();
2178

J
Johannes Berg 已提交
2179
	spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
2180 2181 2182 2183 2184
	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
2185
		if (local->queue_stop_reasons[i] ||
2186
		    skb_queue_empty(&local->pending[i]))
2187
			continue;
2188

2189
		while (!skb_queue_empty(&local->pending[i])) {
J
Johannes Berg 已提交
2190
			struct sk_buff *skb = __skb_dequeue(&local->pending[i]);
2191 2192
			struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);

2193 2194 2195 2196 2197
			if (WARN_ON(!info->control.vif)) {
				kfree_skb(skb);
				continue;
			}

J
Johannes Berg 已提交
2198 2199 2200 2201 2202 2203 2204
			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)
2205
				break;
2206
		}
2207 2208 2209

		if (skb_queue_empty(&local->pending[i]))
			list_for_each_entry_rcu(sdata, &local->interfaces, list)
J
Johannes Berg 已提交
2210
				netif_wake_subqueue(sdata->dev, i);
2211
	}
J
Johannes Berg 已提交
2212
	spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
2213

2214
	rcu_read_unlock();
2215 2216 2217 2218
}

/* functions for drivers to get certain frames */

2219 2220
static void ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
				     struct ieee80211_if_ap *bss,
2221 2222
				     struct sk_buff *skb,
				     struct beacon_data *beacon)
2223 2224 2225 2226 2227 2228 2229 2230 2231 2232 2233 2234 2235 2236
{
	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)
2237
		bss->dtim_count = sdata->vif.bss_conf.dtim_period - 1;
2238 2239 2240 2241 2242 2243 2244
	else
		bss->dtim_count--;

	tim = pos = (u8 *) skb_put(skb, 6);
	*pos++ = WLAN_EID_TIM;
	*pos++ = 4;
	*pos++ = bss->dtim_count;
2245
	*pos++ = sdata->vif.bss_conf.dtim_period;
2246 2247 2248 2249

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

2250 2251
	bss->dtim_bc_mc = aid0 == 1;

2252 2253 2254 2255 2256 2257 2258 2259 2260 2261 2262 2263 2264 2265 2266 2267 2268 2269 2270 2271 2272 2273
	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 */
2274
		skb_put(skb, n2 - n1);
2275 2276 2277 2278 2279 2280 2281 2282 2283
		memcpy(pos, bss->tim + n1, n2 - n1 + 1);

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

2284 2285 2286
struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
					 struct ieee80211_vif *vif,
					 u16 *tim_offset, u16 *tim_length)
2287 2288
{
	struct ieee80211_local *local = hw_to_local(hw);
2289
	struct sk_buff *skb = NULL;
2290
	struct ieee80211_tx_info *info;
2291 2292
	struct ieee80211_sub_if_data *sdata = NULL;
	struct ieee80211_if_ap *ap = NULL;
2293
	struct beacon_data *beacon;
2294
	struct ieee80211_supported_band *sband;
2295
	enum ieee80211_band band = local->hw.conf.channel->band;
2296
	struct ieee80211_tx_rate_control txrc;
2297

2298
	sband = local->hw.wiphy->bands[band];
2299 2300

	rcu_read_lock();
2301

2302
	sdata = vif_to_sdata(vif);
2303

2304 2305 2306
	if (!ieee80211_sdata_running(sdata))
		goto out;

2307 2308 2309 2310 2311
	if (tim_offset)
		*tim_offset = 0;
	if (tim_length)
		*tim_length = 0;

2312
	if (sdata->vif.type == NL80211_IFTYPE_AP) {
2313 2314
		ap = &sdata->u.ap;
		beacon = rcu_dereference(ap->beacon);
D
Dan Carpenter 已提交
2315
		if (beacon) {
J
Johannes Berg 已提交
2316 2317 2318 2319 2320 2321 2322 2323 2324
			/*
			 * 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;
2325

J
Johannes Berg 已提交
2326 2327 2328
			skb_reserve(skb, local->tx_headroom);
			memcpy(skb_put(skb, beacon->head_len), beacon->head,
			       beacon->head_len);
2329

2330 2331 2332 2333 2334 2335 2336 2337
			/*
			 * 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) {
2338 2339
				ieee80211_beacon_add_tim(sdata, ap, skb,
							 beacon);
2340 2341 2342
			} else {
				unsigned long flags;

2343
				spin_lock_irqsave(&local->tim_lock, flags);
2344 2345
				ieee80211_beacon_add_tim(sdata, ap, skb,
							 beacon);
2346
				spin_unlock_irqrestore(&local->tim_lock, flags);
2347
			}
2348

2349 2350 2351 2352 2353
			if (tim_offset)
				*tim_offset = beacon->head_len;
			if (tim_length)
				*tim_length = skb->len - beacon->head_len;

J
Johannes Berg 已提交
2354 2355 2356
			if (beacon->tail)
				memcpy(skb_put(skb, beacon->tail_len),
				       beacon->tail, beacon->tail_len);
2357 2358
		} else
			goto out;
2359
	} else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
2360
		struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
2361
		struct ieee80211_hdr *hdr;
2362
		struct sk_buff *presp = rcu_dereference(ifibss->presp);
2363

2364
		if (!presp)
2365 2366
			goto out;

2367
		skb = skb_copy(presp, GFP_ATOMIC);
2368 2369 2370 2371
		if (!skb)
			goto out;

		hdr = (struct ieee80211_hdr *) skb->data;
2372 2373
		hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
						 IEEE80211_STYPE_BEACON);
J
Johannes Berg 已提交
2374
	} else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2375 2376
		struct ieee80211_mgmt *mgmt;
		u8 *pos;
2377 2378
		int hdr_len = offsetof(struct ieee80211_mgmt, u.beacon) +
			      sizeof(mgmt->u.beacon);
2379

2380 2381 2382 2383 2384
#ifdef CONFIG_MAC80211_MESH
		if (!sdata->u.mesh.mesh_id_len)
			goto out;
#endif

2385 2386 2387 2388 2389 2390
		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) +
2391
				    2 + sizeof(struct ieee80211_ht_cap) +
2392
				    2 + sizeof(struct ieee80211_ht_operation) +
2393 2394 2395
				    2 + sdata->u.mesh.mesh_id_len +
				    2 + sizeof(struct ieee80211_meshconf_ie) +
				    sdata->u.mesh.ie_len);
J
Johannes Berg 已提交
2396 2397 2398 2399
		if (!skb)
			goto out;

		skb_reserve(skb, local->hw.extra_tx_headroom);
2400 2401
		mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len);
		memset(mgmt, 0, hdr_len);
2402 2403
		mgmt->frame_control =
		    cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_BEACON);
J
Johannes Berg 已提交
2404
		memset(mgmt->da, 0xff, ETH_ALEN);
2405 2406
		memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
		memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
J
Johannes Berg 已提交
2407
		mgmt->u.beacon.beacon_int =
2408
			cpu_to_le16(sdata->vif.bss_conf.beacon_int);
2409 2410
		mgmt->u.beacon.capab_info |= cpu_to_le16(
			sdata->u.mesh.security ? WLAN_CAPABILITY_PRIVACY : 0);
J
Johannes Berg 已提交
2411 2412 2413 2414 2415

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

2416
		if (ieee80211_add_srates_ie(&sdata->vif, skb) ||
2417
		    mesh_add_ds_params_ie(skb, sdata) ||
2418
		    ieee80211_add_ext_srates_ie(&sdata->vif, skb) ||
2419
		    mesh_add_rsn_ie(skb, sdata) ||
2420
		    mesh_add_ht_cap_ie(skb, sdata) ||
2421
		    mesh_add_ht_oper_ie(skb, sdata) ||
2422 2423 2424 2425 2426 2427
		    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;
		}
2428 2429
	} else {
		WARN_ON(1);
2430
		goto out;
2431 2432
	}

2433 2434
	info = IEEE80211_SKB_CB(skb);

J
Johannes Berg 已提交
2435
	info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
2436
	info->flags |= IEEE80211_TX_CTL_NO_ACK;
2437
	info->band = band;
2438 2439 2440 2441 2442 2443 2444

	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;
2445 2446 2447 2448 2449
	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;
2450 2451
	memcpy(txrc.rate_idx_mcs_mask, sdata->rc_rateidx_mcs_mask[band],
	       sizeof(txrc.rate_idx_mcs_mask));
2452
	txrc.bss = true;
2453
	rate_control_get_rate(sdata, NULL, &txrc);
2454 2455

	info->control.vif = vif;
2456

2457 2458 2459
	info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT |
			IEEE80211_TX_CTL_ASSIGN_SEQ |
			IEEE80211_TX_CTL_FIRST_FRAGMENT;
2460
 out:
2461
	rcu_read_unlock();
2462 2463
	return skb;
}
2464
EXPORT_SYMBOL(ieee80211_beacon_get_tim);
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 2490 2491 2492 2493 2494 2495 2496
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);

2497 2498 2499 2500 2501 2502 2503 2504 2505 2506 2507 2508 2509 2510 2511 2512 2513
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));
2514
	if (!skb)
2515
		return NULL;
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 2545 2546 2547 2548 2549 2550 2551
	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));
2552
	if (!skb)
2553
		return NULL;
2554

2555 2556 2557 2558 2559 2560 2561 2562 2563 2564 2565 2566 2567 2568 2569 2570
	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);

2571 2572 2573 2574 2575 2576 2577 2578 2579 2580 2581 2582 2583 2584 2585 2586 2587 2588
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);
2589
	if (!skb)
2590 2591 2592 2593 2594 2595 2596 2597 2598 2599 2600 2601 2602 2603 2604
		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;
2605
	if (ssid_len)
2606 2607 2608 2609 2610 2611 2612 2613 2614 2615 2616 2617
		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);

2618
void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
2619
		       const void *frame, size_t frame_len,
2620
		       const struct ieee80211_tx_info *frame_txctl,
2621 2622 2623 2624
		       struct ieee80211_rts *rts)
{
	const struct ieee80211_hdr *hdr = frame;

2625 2626
	rts->frame_control =
	    cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
2627 2628
	rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
					       frame_txctl);
2629 2630 2631 2632 2633
	memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
	memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
}
EXPORT_SYMBOL(ieee80211_rts_get);

2634
void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
2635
			     const void *frame, size_t frame_len,
2636
			     const struct ieee80211_tx_info *frame_txctl,
2637 2638 2639 2640
			     struct ieee80211_cts *cts)
{
	const struct ieee80211_hdr *hdr = frame;

2641 2642
	cts->frame_control =
	    cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
2643 2644
	cts->duration = ieee80211_ctstoself_duration(hw, vif,
						     frame_len, frame_txctl);
2645 2646 2647 2648 2649
	memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
}
EXPORT_SYMBOL(ieee80211_ctstoself_get);

struct sk_buff *
2650
ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
2651
			  struct ieee80211_vif *vif)
2652 2653
{
	struct ieee80211_local *local = hw_to_local(hw);
2654
	struct sk_buff *skb = NULL;
2655
	struct ieee80211_tx_data tx;
2656 2657
	struct ieee80211_sub_if_data *sdata;
	struct ieee80211_if_ap *bss = NULL;
2658
	struct beacon_data *beacon;
2659
	struct ieee80211_tx_info *info;
2660

2661
	sdata = vif_to_sdata(vif);
2662
	bss = &sdata->u.ap;
2663 2664 2665 2666

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

2667
	if (sdata->vif.type != NL80211_IFTYPE_AP || !beacon || !beacon->head)
2668
		goto out;
2669

2670
	if (bss->dtim_count != 0 || !bss->dtim_bc_mc)
2671
		goto out; /* send buffered bc/mc only after DTIM beacon */
2672

2673 2674 2675
	while (1) {
		skb = skb_dequeue(&bss->ps_bc_buf);
		if (!skb)
2676
			goto out;
2677 2678 2679 2680 2681 2682 2683 2684 2685 2686 2687 2688
		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
2689
		if (!ieee80211_tx_prepare(sdata, &tx, skb))
2690 2691 2692
			break;
		dev_kfree_skb_any(skb);
	}
2693 2694 2695

	info = IEEE80211_SKB_CB(skb);

2696 2697
	tx.flags |= IEEE80211_TX_PS_BUFFERED;
	tx.channel = local->hw.conf.channel;
2698
	info->band = tx.channel->band;
2699

2700
	if (invoke_tx_handlers(&tx))
2701
		skb = NULL;
2702
 out:
2703
	rcu_read_unlock();
2704 2705 2706 2707

	return skb;
}
EXPORT_SYMBOL(ieee80211_get_buffered_bc);
J
Johannes Berg 已提交
2708

2709 2710
void ieee80211_tx_skb_tid(struct ieee80211_sub_if_data *sdata,
			  struct sk_buff *skb, int tid)
J
Johannes Berg 已提交
2711 2712 2713 2714 2715
{
	skb_set_mac_header(skb, 0);
	skb_set_network_header(skb, 0);
	skb_set_transport_header(skb, 0);

2716 2717
	skb_set_queue_mapping(skb, ieee802_1d_to_ac[tid]);
	skb->priority = tid;
2718

2719 2720 2721 2722 2723 2724
	/*
	 * The other path calling ieee80211_xmit is from the tasklet,
	 * and while we can handle concurrent transmissions locking
	 * requirements are that we do not come into tx with bhs on.
	 */
	local_bh_disable();
J
Johannes Berg 已提交
2725
	ieee80211_xmit(sdata, skb);
2726
	local_bh_enable();
J
Johannes Berg 已提交
2727
}